char *cksslv = "SSL/TLS support, 8.0.203,  9 Jul 2002";
/*
  C K _ S S L . C --  OpenSSL Interface for C-Kermit

  Copyright (C) 1985, 2002,
    Trustees of Columbia University in the City of New York.
    All rights reserved.  See the C-Kermit COPYING.TXT file or the
    copyright text in the ckcmai.c module for disclaimer and permissions.

  Author:  Jeffrey E Altman (jaltman@columbia.edu)

  Provides:

  . Telnet Auth SSL option compatible with Tim Hudson's hack.
  . Telnet START_TLS option
  . Configuration of certificate and key files
  . Certificate verification and revocation list checks
  . Client certificate to user id routine

  Note: This code is written to be compatible with OpenSSL 0.9.6[abc].
  It will also compile with version 0.9.5 although that is discouraged
  due to security weaknesses in that release.   This code may not
  compile with 0.9.7 development releases.
*/

#include "ckcsym.h"
#include "ckcdeb.h"
#include <stdlib.h>
#include <string.h>
#ifdef UNIX
#include <netinet/in.h>
#ifndef FREEBSD4
#include <arpa/inet.h>
#endif /* FREEBSD4 */
#endif /* UNIX */

#ifdef CK_SSL
static int ssl_installed = 1;
#endif /* CK_SSL */
int
ck_ssh_is_installed()
{
#ifdef SSHBUILTIN
#ifdef SSLDLL
#ifdef NT
    extern HINSTANCE hCRYPTO;
#else /* NT */
    extern HMODULE hCRYPTO;
#endif /* NT */
    debug(F111,"ck_ssh_is_installed","hCRYPTO",hCRYPTO);
    return(ssl_installed && (hCRYPTO != NULL));
#else /* SSLDLL */
    return(ssl_installed);
#endif /* SSLDLL */
#else
    return 0;
#endif
}

int
ck_ssleay_is_installed()
{
#ifdef CK_SSL
#ifdef SSLDLL
#ifdef NT
    extern HINSTANCE hSSL, hCRYPTO;
#else /* NT */
    extern HMODULE hSSL, hCRYPTO;
#endif /* NT */
    debug(F111,"ck_ssleay_is_installed","hSSL",hSSL);
    debug(F111,"ck_ssleay_is_installed","hCRYPTO",hCRYPTO);
    return(ssl_installed && (hSSL != NULL) && (hCRYPTO != NULL));
#else /* SSLDLL */
    return(ssl_installed);
#endif /* SSLDLL */
#else /* CK_SSL */
    return(0);
#endif /* CK_SSL */
}

#ifdef CK_SSL
#include "ckcker.h"
#include "ckucmd.h"                             /* For struct keytab */
#include "ckctel.h"
#include "ck_ssl.h"
#ifdef UNIX
#include <pwd.h>                    /* Password file for home directory */
#endif /* UNIX */
#ifdef OS2
#include <process.h>
#endif /* OS2 */
#ifdef OS2ONLY
#include "ckotcp.h"
#endif /* OS2ONLY */

#ifdef SSLDLL
int ssl_finished_messages = 0;
#else /* SSLDLL */
#ifdef OPENSSL_VERSION_NUMBER
int ssl_finished_messages = (OPENSSL_VERSION_NUMBER >= 0x0090581fL);
#else
!ERROR This module requires OpenSSL 0.9.5a or higher
#endif /* OPENSSL_VERSION_NUMBER */
#endif /* SSLDLL */

static int auth_ssl_valid = 0;
static char *auth_ssl_name = 0;    /* this holds the oneline name */
char ssl_err[SSL_ERR_BFSZ]="";

BIO *bio_err=NULL;
X509_STORE *crl_store = NULL;

#ifndef NOFTP
#ifndef SYSFTP
SSL *ssl_ftp_con             = NULL;
SSL_CTX *ssl_ftp_ctx         = NULL;
SSL *ssl_ftp_data_con        = NULL;
int ssl_ftp_active_flag      = 0;
int ssl_ftp_data_active_flag = 0;
#endif /* SYSFTP */
#endif /* NOFTP */

#ifndef NOHTTP
SSL *tls_http_con            = NULL;
SSL_CTX *tls_http_ctx        = NULL;
int tls_http_active_flag     = 0;
int ssl_http_initialized = 0;
#endif /* NOHTTP */

SSL_CTX *ssl_ctx = NULL;
SSL *ssl_con = NULL;
int ssl_debug_flag = 0;
int ssl_verbose_flag = 0;
int ssl_only_flag = 0;
int ssl_active_flag = 0;
int ssl_verify_flag = SSL_VERIFY_PEER;
int ssl_certsok_flag = 0;
char *ssl_rsa_cert_file = NULL;
char *ssl_rsa_cert_chain_file = NULL;
char *ssl_rsa_key_file = NULL;
char *ssl_dsa_cert_file = NULL;
char *ssl_dsa_cert_chain_file = NULL;
char *ssl_dh_key_file = NULL;
char *ssl_crl_file = NULL;
char *ssl_crl_dir = NULL;
char *ssl_verify_file = NULL;
char *ssl_verify_dir = NULL;
char *ssl_dh_param_file = NULL;
char *ssl_cipher_list = NULL;
char *ssl_rnd_file = NULL;

SSL_CTX *tls_ctx = NULL;
SSL *tls_con = NULL;
int tls_only_flag = 0;
int tls_active_flag = 0;

int ssl_initialized = 0;
int ssl_verify_depth = -1; /* used to track depth in verify routines */

/* compile this set to 1 to negotiate SSL/TLS but not actually start it */
int ssl_dummy_flag=0;

extern int inserver;
extern int debses;
extern int accept_complete;
extern char szHostName[], szUserNameRequested[], szUserNameAuthenticated[];

_PROTOTYP(int X509_to_user,(X509 *, char *, int));

int
#ifdef CK_ANSIC
ssl_server_verify_callback(int ok, X509_STORE_CTX * ctx)
#else /* CK_ANSIC */
ssl_server_verify_callback(ok, ctx)
int ok;
X509_STORE_CTX *ctx;
#endif /* CK_ANSIC */
{
    static char *saved_subject=NULL;
    char *subject=NULL, *issuer=NULL;
    int depth,error;
    X509 *xs = NULL;

    if ( ssl_certsok_flag )
        return(1);

    error=X509_STORE_CTX_get_error(ctx);
    depth=X509_STORE_CTX_get_error_depth(ctx);
    xs=X509_STORE_CTX_get_current_cert(ctx);

    if (depth==0) {
        /* clear things */
        if (saved_subject!=NULL) {
            free(saved_subject);
            saved_subject=NULL;
        }
        if (auth_ssl_name!=NULL) {
            free(auth_ssl_name);
            auth_ssl_name=NULL;
        }
    }


    if (ssl_debug_flag && !inserver) {
        printf("ssl:server_verify_callback:depth=%d ok=%d err=%d-%s\r\n",
            depth,ok,error,X509_verify_cert_error_string(error));
    }

    /* first thing is to have a meaningful name for the current
     * certificate that is being verified ... and if we cannot
     * determine that then something is seriously wrong!
     */
    makestr(&subject,
            (char *)X509_NAME_oneline(X509_get_subject_name(xs),NULL,0));
    makestr(&issuer,
            (char *)X509_NAME_oneline(X509_get_issuer_name(xs),NULL,0));
    if (!subject || !subject[0] || !issuer || !issuer[0]) {
        ok = 0;
        goto return_time;
    }

    if (ssl_verbose_flag && !inserver && depth != ssl_verify_depth) {
        printf("Certificate[%d] subject=%s\r\n",depth,subject);
        printf("Certificate[%d] issuer =%s\r\n",depth,issuer);
        ssl_verify_depth = depth;
    }

    /* make sure that the certificate that has been presented */
    /* has not been revoked (if we have been given a CRL.     */
    ok =  ssl_verify_crl(ok, ctx);

    /* if we have any form of error in secure mode we reject the connection */
    if (error!=X509_V_OK) {
        if (inserver) {
#ifdef CKSYSLOG
            if (ckxsyslog >= SYSLG_LI && ckxlogging) {
                cksyslog(SYSLG_LI, 0,
                          "X.509 Certificate verify failure",
                          (char *) subject,
                          (char *)X509_verify_cert_error_string(error)
                          );
            }
#endif /* CKSYSLOG */

        } else {
            if ( ssl_verify_flag &
                 (SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
                printf("Error: ");
            else
                printf("Warning: ");
            switch (error) {
            case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT:
                printf("Certificate is self signed.\r\n");
                break;
            case X509_V_ERR_CERT_HAS_EXPIRED:
                printf("Certificate has expired.\r\n");
                break;
            case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
                printf(
  "Certificate issuer's certificate isn't available locally.\r\n");
                break;
            case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
                printf("Unable to verify leaf signature.\r\n");
                break;
            case X509_V_ERR_CERT_REVOKED:
                printf("Certificate revoked.\r\n");
                break;
            default:
                printf("Error %d while verifying certificate.\r\n",
                       ctx->error);
                break;
            }
        }
        ok = !(ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT);
    } else {
        /* if we got all the way to the top of the tree then
         * we *can* use this certificate for a username to
         * match ... in all other cases we must not!
         */
        auth_ssl_name = saved_subject;
        saved_subject = NULL;
    }

  return_time:

    /* save the name if at least the first level is okay */
    if (depth == 0 && ok)
        makestr(&saved_subject,subject);

    /* clean up things */
    if (subject!=NULL)
        free(subject);
    if (issuer!=NULL)
        free(issuer);

    return ok;
}

int
#ifdef CK_ANSIC
ssl_client_verify_callback(int ok, X509_STORE_CTX * ctx)
#else
ssl_client_verify_callback(ok, ctx)
int ok;
X509_STORE_CTX *ctx;
#endif
{
    char subject[256]="", issuer[256]="";
    int depth, error;
    X509 *xs;

    xs=X509_STORE_CTX_get_current_cert(ctx);
    error=X509_STORE_CTX_get_error(ctx);
    depth=X509_STORE_CTX_get_error_depth(ctx);

    if ( ssl_debug_flag )
        printf("ssl:client_verify_callback:depth=%d ok=%d err=%d-%s\r\n",
                depth,ok,error,X509_verify_cert_error_string(error));

    if ( ssl_certsok_flag ) {
        ok = 1;
    }

    /* first thing is to have a meaningful name for the current
     * certificate that is being verified ... and if we cannot
     * determine that then something is seriously wrong!
     */
    X509_NAME_oneline(X509_get_subject_name(xs),subject,256);
    if (!subject[0]) {
        int len;
        ERR_print_errors(bio_err);
        len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
        ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
        uq_ok("X.509 Subject Name unavailable\n", ssl_err, 1, NULL, 0);
        ok=0;
        goto return_time;
    }

    X509_NAME_oneline(X509_get_issuer_name(xs),issuer,256);
    if (!issuer[0]) {
        int len;
        ERR_print_errors(bio_err);
        len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
        ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
        uq_ok("X.509 Issuer Name unavailable\n", ssl_err, 1, NULL, 0);
        ok=0;
        goto return_time;
    }

    if (ssl_verbose_flag && depth != ssl_verify_depth) {
        printf("Certificate[%d] subject=%s\r\n",depth,subject);
        printf("Certificate[%d] issuer =%s\r\n",depth,issuer);
        ssl_verify_depth = depth;
    }

    ok = ssl_verify_crl(ok, ctx);

    if ( !ok ) {
        char prefix[1024];
        /* if the server is using a self signed certificate then
         * we need to decide if that is good enough for us to
         * accept ...
         */

        switch ( error ) {
        case X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT: {
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                /* make 100% sure that in secure more we drop the
                 * connection if the server does not have a
                 * real certificate!
                 */
                ckmakxmsg(prefix,1024,
                           "Error: Server has a self-signed certificate\n",
                           "[",ckitoa(depth),"] subject=",subject,
                           "[",ckitoa(depth),"] issuer=",issuer,
                           "\n",NULL,NULL);

                uq_ok(prefix, "Rejecting Connection", 1, NULL, 0);

                /* sometimes it is really handy to be able to debug things
                * and still get a connection!
                */
                if (ssl_debug_flag) {
                    printf("SSL: debug -> ignoring cert required!\r\n");
                    ok=1;
                } else {
                    ok=0;
                }
                goto return_time;
            } else if (ssl_verify_flag != SSL_VERIFY_NONE) {
                ckmakxmsg(prefix,1024,
                           "Warning: Server has a self-signed certificate\n",
                           "[",ckitoa(depth),"] subject=",subject,
                           "[",ckitoa(depth),"] issuer=",issuer,
                           "\n",NULL,NULL);

                ok = uq_ok(prefix,
                           "Continue? (Y/N) ",
                           3, NULL, 0);
                if ( ok < 0 )
                    ok = 0;
                goto return_time;
            }
        }
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT:
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                /* make 100% sure that in secure more we drop the
                 * connection if the server does not have a
                 * real certificate!
                 */
                ckmakxmsg(prefix,1024,
                           "Error: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "issuer=",issuer,
                           "\n",NULL,NULL,NULL,NULL,NULL,NULL);
                uq_ok(prefix, "Rejecting Connection", 1, NULL, 0);

                /* sometimes it is really handy to be able to debug things
                * and still get a connection!
                */
                if (ssl_debug_flag) {
                    printf("SSL: debug -> ignoring cert required!\r\n");
                    ok=1;
                } else {
                    ok=0;
                }
                goto return_time;
            } else if (ssl_verify_flag != SSL_VERIFY_NONE) {
                ckmakxmsg(prefix,1024,
                           "Warning: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "issuer=",issuer,
                           "\n",NULL,NULL,NULL,NULL,NULL,NULL);
                ok = uq_ok(prefix, "Continue (Y/N)", 3, NULL, 0);
                goto return_time;
            }
            break;
        case X509_V_ERR_CERT_NOT_YET_VALID:
        case X509_V_ERR_ERROR_IN_CERT_NOT_BEFORE_FIELD:
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                int len;
                /* make 100% sure that in secure more we drop the
                 * connection if the server does not have a
                 * real certificate!
                 */
                ASN1_TIME_print(bio_err,X509_get_notBefore(xs));
                len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                ckmakxmsg(prefix,1024,
                           "Error: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "subject=",subject,
                           "\r\nnotBefore=",ssl_err,
                           "\r\n",NULL,NULL,NULL,NULL);
                uq_ok(prefix, "Rejecting Connection", 1, NULL, 0);
                /* sometimes it is really handy to be able to debug things
                * and still get a connection!
                */
                if (ssl_debug_flag) {
                    printf("SSL: debug -> ignoring cert required!\r\n");
                    ok=1;
                } else {
                    ok=0;
                }
                goto return_time;
            } else if (ssl_verify_flag != SSL_VERIFY_NONE) {
                int len;
                ASN1_TIME_print(bio_err,X509_get_notBefore(xs));
                len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                ckmakxmsg(prefix,1024,
                           "Warning: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "subject=",subject,
                           "\r\nnotBefore=",ssl_err,
                           "\r\n",NULL,NULL,NULL,NULL);
                ok = uq_ok(prefix, "Continue (Y/N)", 3, NULL, 0);
            }
            break;
        case X509_V_ERR_CERT_HAS_EXPIRED:
        case X509_V_ERR_ERROR_IN_CERT_NOT_AFTER_FIELD:
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                int len;
                /* make 100% sure that in secure more we drop the
                 * connection if the server does not have a
                 * real certificate!
                 */
                ASN1_TIME_print(bio_err,X509_get_notAfter(xs));
                len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';

                ckmakxmsg(prefix,1024,
                           "Error: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "subject=",subject,
                           "\r\nnotAfter=",ssl_err,
                           "\r\n",NULL,NULL,NULL,NULL);
                uq_ok(prefix, "Rejecting Connection", 1, NULL, 0);
   
                /* sometimes it is really handy to be able to debug things
                * and still get a connection!
                */
                if (ssl_debug_flag) {
                    printf("SSL: debug -> ignoring cert required!\r\n");
                    ok=1;
                } else {
                    ok=0;
                }
                goto return_time;
            } else if (ssl_verify_flag != SSL_VERIFY_NONE) {
                int len;
                ASN1_TIME_print(bio_err,X509_get_notAfter(xs));
                len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                ckmakxmsg(prefix,1024,
                           "Warning: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "subject=",subject,
                           "\r\nnotAfter=",ssl_err,
                           "\r\n",NULL,NULL,NULL,NULL);
                ok = uq_ok(prefix, "Continue (Y/N)", 3, NULL, 0);
            }
            break;
        case X509_V_ERR_SELF_SIGNED_CERT_IN_CHAIN:
        case X509_V_ERR_UNABLE_TO_GET_ISSUER_CERT_LOCALLY:
            /*
             * When an SSL server sends its certificates to the client there
             * are two" conventions": one is to send the complete certificate
             * chain and the other is to send the whole chain apart from the
             * root.
             *
             * You don't usually need the root because the root is normally
             * stored and trusted locally.
             *
             * So if you get the whole chain it will complain about the self
             * signed certificate whereas if the root is missing it says it
             * can't find the issuer certificate.
             */
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                /* make 100% sure that in secure more we drop the
                 * connection if the server does not have a
                 * real certificate!
                 */
                ckmakxmsg(prefix,1024,
                           "Error: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "issuer=",issuer,
                           "\r\n",NULL,NULL,NULL,NULL,NULL,NULL);
                uq_ok(prefix, "Rejecting Connection", 1, NULL, 0);
                /* sometimes it is really handy to be able to debug things
                * and still get a connection!
                */
                if (ssl_debug_flag) {
                    printf("SSL: debug -> ignoring cert required!\r\n");
                    ok=1;
                } else {
                    ok=0;
                }
                goto return_time;
            } else if (ssl_verify_flag != SSL_VERIFY_NONE) {
                ckmakxmsg(prefix,1024,
                           "Warning: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "issuer=",issuer,
                           "\r\n",NULL,NULL,NULL,NULL,NULL,NULL);
                ok = uq_ok(prefix, "Continue (Y/N)", 3, NULL, 0);
            }
            break;
        case X509_V_ERR_UNABLE_TO_VERIFY_LEAF_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_GET_CRL:
        case X509_V_ERR_UNABLE_TO_DECRYPT_CERT_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_DECRYPT_CRL_SIGNATURE:
        case X509_V_ERR_UNABLE_TO_DECODE_ISSUER_PUBLIC_KEY:
        case X509_V_ERR_CERT_SIGNATURE_FAILURE:
        case X509_V_ERR_CRL_SIGNATURE_FAILURE:
        case X509_V_ERR_CRL_NOT_YET_VALID:
        case X509_V_ERR_CRL_HAS_EXPIRED:
        case X509_V_ERR_ERROR_IN_CRL_LAST_UPDATE_FIELD:
        case X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD:
        case X509_V_ERR_OUT_OF_MEM:
        case X509_V_ERR_CERT_CHAIN_TOO_LONG:
        case X509_V_ERR_CERT_REVOKED:
        case X509_V_ERR_APPLICATION_VERIFICATION:
        default:
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                /* make 100% sure that in secure mode we drop the
                 * connection if the server does not have a
                 * real certificate!
                 */
                ckmakxmsg(prefix,1024,
                           "Error: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "subject=",subject,
                           "\r\n",NULL,NULL,NULL,NULL,NULL,NULL);
                uq_ok(prefix, "Rejecting Connection", 1, NULL, 0);

                /* sometimes it is really handy to be able to debug things
                * and still get a connection!
                */
                if (ssl_debug_flag) {
                    printf("SSL: debug -> ignoring cert required!\r\n");
                    ok=1;
                } else {
                    ok=0;
                }
                goto return_time;
            } else if (ssl_verify_flag != SSL_VERIFY_NONE) {
                ckmakxmsg(prefix,1024,
                           "Warning: ",
                           (char *)X509_verify_cert_error_string(error),
                           "\r\n",
                           "subject=",subject,
                           "\r\n",NULL,NULL,NULL,NULL,NULL,NULL);
                ok = uq_ok(prefix, "Continue (Y/N)", 3, NULL, 0);
            }
            break;
        }
    }

  return_time:
    if ( ssl_debug_flag )
        printf("ssl:client_verify_callback => ok: %d\r\n",ok);
    return ok;
}

VOID
#ifdef CK_ANSIC
ssl_client_info_callback(const SSL *s, int where, int ret)
#else
ssl_client_info_callback(s,where,ret)
const SSL *s;
int where;
int ret;
#endif /* CK_ANSIC */
{
    if (inserver || !ssl_debug_flag)
        return;

    switch ( where ) {
    case SSL_CB_CONNECT_LOOP:
        printf("SSL_connect:%s %s\r\n",
                SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        break;
    case SSL_CB_CONNECT_EXIT:
        if (ret == 0) {
            printf("SSL_connect:failed in %s %s\r\n",
                    SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        } else if (ret < 0) {
            printf("SSL_connect:error in %s %s\r\n",
                    SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        }
        break;
    case SSL_CB_ACCEPT_LOOP:
        printf("SSL_accept:%s %s\r\n",
                SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        break;
    case SSL_CB_ACCEPT_EXIT:
        if (ret == 0) {
            printf("SSL_accept:failed in %s %s\r\n",
                    SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        } else if (ret < 0) {
            printf("SSL_accept:error in %s %s\r\n",
                    SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        }
        break;
    case SSL_CB_READ_ALERT:
        printf("SSL_read_alert\r\n");
        break;
    case SSL_CB_WRITE_ALERT:
        printf("SSL_write_alert\r\n");
        break;
    case SSL_CB_HANDSHAKE_START:
        printf("SSL_handshake:%s %s\r\n",
                SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        break;
    case SSL_CB_HANDSHAKE_DONE:
        printf("SSL_handshake:%s %s\r\n",
                SSL_state_string((SSL *)s),SSL_state_string_long((SSL *)s));
        break;
    }
}

#ifdef USE_CERT_CB
/* Return 1, client cert is available */
/* Return 0, no client cert is available */
/* Return -1, callback must be called again. SSL_want_x509_lookup() == 1 */
int
#ifdef CK_ANSIC
ssl_client_cert_callback(SSL * s, X509 ** x509, EVP_PKEY ** pkey)
#else /* CK_ANSIC */
ssl_client_cert_callback(s, x509, pkey)
    SSL * s;
    X509 ** x509;
    EVP_PKEY ** pkey;
#endif /* CK_ANSIC */
{
    if ( ssl_debug_flag ) {
        const char * cipher_list=SSL_get_cipher(s);
        printf("ssl_client_cert_callback called (%s)\r\n",
                cipher_list?cipher_list:"UNKNOWN");
    }
#ifdef COMMENT
    if ( s == tls_con ) {
        if (tls_load_certs(tls_cts,tls_con,0)) {
            *x509 = SSL_get_certificate(s);
            *pkey = SSL_get_privatekey(s);
            return(1);
        }
    } else if ( s == ssl_con ) {
        if (tls_load_certs(ssl_ctx,ssl_con,0)) {
            *x509 = SSL_get_certificate(s);
            *pkey = SSL_get_privatekey(s);
            return(1);
        }
    }
    return(0);
#else /* COMMENT */
    return(0);
#endif /* COMMENT */
}
#endif /* USE_CERT_CB */

#ifndef MS_CALLBACK
#define MS_CALLBACK
#endif /* MS_CALLBACK */

static RSA MS_CALLBACK *
#ifdef CK_ANSIC
tmp_rsa_cb(SSL * s, int export, int keylength)
#else /* CK_ANSIC */
tmp_rsa_cb(s,export,keylength)
SSL *s;
int export;
int keylength;
#endif /* CK_ANSIC */
{
    static RSA *rsa_tmp=NULL;
    extern int quiet;

#ifndef NO_RSA
    if (rsa_tmp == NULL)
    {
        if (ssl_debug_flag)
            printf("Generating temporary (%d bit) RSA key...\r\n",keylength);

        rsa_tmp=RSA_generate_key(keylength,RSA_F4,NULL,NULL);

        if (ssl_debug_flag)
            printf("\r\n");
    }
#else /* NO_RSA */
    if (ssl_debug_flag)
        printf("Unable to generate temporary RSA key...\r\n");
#endif
    return(rsa_tmp);
}


#ifndef NO_DH
static unsigned char dh512_p[]={
    0xE9,0x4E,0x3A,0x64,0xFA,0x65,0x5F,0xA6,0x44,0xC7,0xFC,0xF1,
    0x16,0x8B,0x11,0x11,0x7A,0xF0,0xB2,0x49,0x80,0x56,0xA3,0xF8,
    0x0F,0x7D,0x01,0x68,0x5D,0xF6,0x8A,0xEA,0x8C,0xDD,0x01,0xDC,
    0x43,0x18,0xE0,0xC4,0x89,0x80,0xE6,0x2D,0x44,0x77,0x45,0xFD,
    0xBA,0xFC,0x43,0x35,0x12,0xC0,0xED,0x32,0xD3,0x16,0xEF,0x51,
    0x09,0x44,0xA2,0xDB,
};
static unsigned char dh512_g[]={
    0x05,
};

static unsigned char dh768_p[]={
    0x8B,0x2A,0x8C,0x6C,0x0F,0x87,0xC7,0x34,0xEE,0x2E,0xFB,0x60,
    0x94,0xB3,0xBF,0x95,0xBA,0x84,0x74,0x86,0xEA,0xE0,0xA4,0x33,
    0xE0,0x8F,0x7C,0x79,0x5C,0x62,0xE2,0x91,0xC5,0x6D,0x68,0xB9,
    0x6C,0x5E,0x4E,0x94,0x0C,0x8E,0x56,0x8E,0xEB,0x98,0x7C,0x6E,
    0x0E,0xF2,0xD5,0xAA,0x22,0x27,0x3F,0x0F,0xAF,0x10,0xB5,0x0B,
    0x16,0xCC,0x05,0x27,0xBB,0x58,0x6D,0x61,0x4B,0x2B,0xAB,0xDC,
    0x6A,0x15,0xBC,0x36,0x75,0x4D,0xEC,0xAB,0xFA,0xB6,0xE1,0xB1,
    0x13,0x70,0xD8,0x77,0xCD,0x5E,0x51,0x77,0x81,0x0D,0x77,0x43,
};
static unsigned char dh768_g[]={
    0x05,
};

static unsigned char dh1024_p[]={
    0xA4,0x75,0xCF,0x35,0x00,0xAF,0x3C,0x17,0xCE,0xB0,0xD0,0x52,
    0x43,0xA0,0x0E,0xFA,0xA2,0xC9,0xBE,0x0B,0x76,0x7A,0xD9,0x2E,
    0xF4,0x97,0xAC,0x02,0x24,0x69,0xF6,0x36,0x4F,0xAB,0xCC,0x43,
    0xC1,0x74,0xFF,0xA3,0xD4,0x04,0x0F,0x11,0x2B,0x6D,0x8C,0x47,
    0xC9,0xCF,0x40,0x93,0x9B,0x7D,0x1E,0x52,0x85,0xB2,0x17,0x55,
    0x9C,0xF2,0x41,0x02,0x2A,0x9D,0x5F,0x24,0x22,0xC6,0x04,0xC4,
    0xAB,0x92,0x6D,0xC7,0xC8,0xF3,0x41,0x58,0x6C,0x86,0xFD,0xB8,
    0x0F,0x2D,0xDD,0xBF,0xA8,0x40,0x0C,0x58,0xC8,0xF2,0x3F,0x18,
    0xEF,0xF1,0x93,0x3E,0xBA,0x16,0x41,0xBE,0x32,0x6C,0xC5,0x63,
    0xFF,0x8A,0x02,0x3D,0xAC,0xD5,0x5A,0x49,0x64,0x34,0x14,0x2E,
    0xFB,0x2E,0xE7,0x39,0x1A,0x0F,0x3C,0x33,
};
static unsigned char dh1024_g[]={
    0x05,
};

static unsigned char dh1536_p[]={
    0xA3,0x2B,0x75,0x0E,0x7B,0x31,0x82,0xCA,0xF2,0xFC,0xF3,0x3D,
    0xCE,0x5F,0xCD,0x5B,0x95,0xF6,0x2F,0xA4,0x5D,0x08,0x26,0xD2,
    0x5F,0xC0,0x3F,0xC5,0xD8,0xA2,0xFE,0x83,0x26,0xBC,0xEB,0x7D,
    0xF0,0x4E,0xD2,0xA6,0xBB,0x3C,0x88,0x63,0xCE,0x98,0xDE,0x08,
    0xE2,0xE1,0xAF,0xE2,0x38,0xA8,0xFA,0x68,0x76,0x8D,0xBF,0xDF,
    0xBB,0x30,0x15,0xFE,0xBD,0x22,0xCC,0x03,0x4E,0x5E,0x33,0xA3,
    0x6D,0xD6,0x68,0x12,0x97,0x17,0x4B,0xB5,0x84,0x5F,0x5F,0xA3,
    0x5C,0x2F,0xA4,0x10,0xC1,0xAD,0xBF,0xAC,0x30,0xCA,0x47,0x64,
    0x63,0xFE,0xEE,0xEE,0xA1,0x64,0x73,0x70,0xAA,0xF9,0xFE,0xC6,
    0xAD,0x5E,0xF6,0xF3,0x9C,0xDF,0x34,0x53,0x34,0x72,0xA6,0xA4,
    0xBB,0x81,0x5A,0x43,0x41,0xFD,0x41,0x05,0x5B,0x77,0x7B,0x84,
    0x03,0xFA,0x8A,0xFA,0xF7,0x8E,0x0F,0xCB,0x51,0xA2,0xB8,0x45,
    0xFF,0x59,0x42,0xEF,0xCF,0xF6,0x25,0x37,0xE2,0x6D,0xFF,0x69,
    0x11,0xF5,0x77,0x59,0x79,0x1C,0x5F,0x05,0xFC,0x7A,0x65,0x81,
    0x03,0x4A,0x78,0xC6,0xE9,0x48,0x73,0xF6,0x10,0xBC,0x99,0x1C,
    0xEE,0x44,0x2F,0x8B,0x70,0xCA,0xA8,0xB6,0x02,0x83,0x3E,0x0B,
};
static unsigned char dh1536_g[]={
    0x05,
};

static unsigned char dh2048_p[]={
    0xFA,0x4E,0xE4,0x3B,0xFA,0xC1,0x87,0xDD,0xE7,0xC6,0x8B,0xE6,
    0x13,0x85,0xBC,0x9B,0x2B,0x8B,0x5B,0x46,0xBB,0x8B,0x86,0x6D,
    0xD7,0xB6,0xD5,0x49,0xC5,0x54,0xF2,0x3E,0xD2,0x39,0x64,0x9B,
    0x0E,0x33,0x39,0x8F,0xFA,0xFA,0xD9,0x78,0xED,0x34,0x82,0x29,
    0x37,0x58,0x4D,0x5D,0x40,0xCB,0x69,0xE3,0x8A,0x9F,0x17,0x0C,
    0x01,0x23,0x6B,0x05,0x01,0xAF,0x33,0xDE,0xDF,0x1A,0xBB,0x7B,
    0x6A,0x9F,0xD8,0xED,0x8D,0x5E,0x44,0x19,0x5B,0xE0,0xB6,0x23,
    0xF9,0x7A,0x96,0x6E,0x94,0x33,0x31,0x49,0xBA,0x84,0xD5,0x12,
    0xD7,0x6D,0xDC,0x35,0x54,0x64,0xA3,0xD8,0x04,0x26,0xC5,0xAF,
    0x7F,0xE3,0xFE,0x6F,0xBE,0xD5,0x17,0x72,0x4B,0xA6,0xD0,0xA7,
    0x5F,0x18,0xF5,0xF0,0x2D,0x11,0x9A,0xF6,0xD5,0x3B,0x6C,0x61,
    0x3C,0x6F,0x8E,0x09,0x4F,0x2C,0xE1,0x26,0x06,0x51,0xB3,0x19,
    0x85,0x85,0x13,0xF9,0xC2,0x6E,0x80,0x28,0x9E,0x8A,0xA0,0x01,
    0x46,0xD1,0x85,0x44,0x8C,0xE6,0xEE,0x7E,0x1E,0x17,0x3D,0xBA,
    0x54,0xFF,0xE8,0x0E,0xDD,0x51,0xF3,0x74,0x7F,0x0D,0x0B,0xAB,
    0xCA,0x84,0x8D,0x24,0x5D,0x56,0xD4,0x47,0x02,0xFC,0x93,0x9F,
    0xAE,0x9B,0x5C,0xDB,0x63,0xEB,0x65,0x01,0x38,0xC2,0x7B,0x30,
    0x1E,0x17,0x1C,0x75,0xF5,0x16,0x3B,0x4F,0x5F,0x41,0x32,0xB5,
    0xFF,0x9E,0x61,0xFD,0xD2,0x62,0x6E,0xFD,0x8A,0x28,0x93,0x59,
    0x2D,0x70,0x14,0x4D,0xE1,0x86,0xD5,0x90,0xB4,0xDF,0x72,0x71,
    0xE0,0xB4,0xD0,0xD6,0x82,0x3A,0x4A,0x04,0x58,0x32,0x0B,0xD3,
    0x51,0x13,0x32,0x63,
};
static unsigned char dh2048_g[]={
    0x02,
};

static DH *
get_dh512()
{
    DH *dh=NULL;

    if ((dh=DH_new()) == NULL)
        return(NULL);
    dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
    dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
    if ((dh->p == NULL) || (dh->g == NULL))
        return(NULL);
    return(dh);
}

static DH *
get_dh768()
{
    DH *dh=NULL;

    if ((dh=DH_new()) == NULL)
        return(NULL);
    dh->p=BN_bin2bn(dh768_p,sizeof(dh768_p),NULL);
    dh->g=BN_bin2bn(dh768_g,sizeof(dh768_g),NULL);
    if ((dh->p == NULL) || (dh->g == NULL))
        return(NULL);
    return(dh);
}

static DH *
get_dh1024()
{
    DH *dh=NULL;

    if ((dh=DH_new()) == NULL)
        return(NULL);
    dh->p=BN_bin2bn(dh1024_p,sizeof(dh1024_p),NULL);
    dh->g=BN_bin2bn(dh1024_g,sizeof(dh1024_g),NULL);
    if ((dh->p == NULL) || (dh->g == NULL))
        return(NULL);
    return(dh);
}

static DH *
get_dh1536()
{
    DH *dh=NULL;

    if ((dh=DH_new()) == NULL)
        return(NULL);
    dh->p=BN_bin2bn(dh1536_p,sizeof(dh1536_p),NULL);
    dh->g=BN_bin2bn(dh1536_g,sizeof(dh1536_g),NULL);
    if ((dh->p == NULL) || (dh->g == NULL))
        return(NULL);
    return(dh);
}

static DH *
get_dh2048()
{
    DH *dh=NULL;

    if ((dh=DH_new()) == NULL)
        return(NULL);
    dh->p=BN_bin2bn(dh2048_p,sizeof(dh2048_p),NULL);
    dh->g=BN_bin2bn(dh2048_g,sizeof(dh2048_g),NULL);
    if ((dh->p == NULL) || (dh->g == NULL))
        return(NULL);
    return(dh);
}
#endif /* NO_DH */

static DH MS_CALLBACK *
#ifdef CK_ANSIC
tmp_dh_cb(SSL * s, int export, int keylength)
#else /* CK_ANSIC */
tmp_dh_cb(s,export,keylength)
SSL *s;
int export;
int keylength;
#endif /* CK_ANSIC */
{
    static DH *dh_tmp=NULL;
    BIO *bio=NULL;
    extern int quiet;

#ifndef NO_DH
    if (dh_tmp == NULL)
    {
        if (ssl_dh_param_file  &&
             (bio=BIO_new_file(ssl_dh_param_file,"r")) != NULL)
            dh_tmp=PEM_read_bio_DHparams(bio,NULL,NULL,NULL);
        if (bio != NULL)
            BIO_free(bio);

        if ( dh_tmp == NULL ) {
            if ( keylength < 768 )
                dh_tmp = get_dh512();
            else if ( keylength < 1024 )
                dh_tmp = get_dh768();
            else if ( keylength < 1536 )
                dh_tmp = get_dh1024();
            else if ( keylength < 2048 )
                dh_tmp = get_dh1536();
            else
                dh_tmp = get_dh2048();
        }
    }
#else /* NO_DH */
    if (ssl_debug_flag)
        printf("DH not supported...\r\n");
#endif /* NO_DH */
    return(dh_tmp);
}

static void
ssl_display_comp(SSL * ssl)
{
    if ( !ck_ssleay_is_installed() )
        return;

    if (ssl == NULL)
        return;

    if (ssl->expand == NULL || ssl->expand->meth == NULL)
        printf("Compression: None\r\n");
    else {
        printf("Compression: %s\r\n",ssl->expand->meth->name);
    }
}

int
#ifdef CK_ANSIC
ssl_display_connect_details(SSL * ssl_con, int server, int verbose)
#else /* CK_ANSIC */
ssl_display_connect_details(ssl_con,server,verbose)
SSL *ssl_con;
int server;
int verbose;
#endif /* CK_ANSIC */
{
    X509 *peer;
    SSL_CIPHER * cipher;
    const char *cipher_list;
    char buf[512]="";

    if ( !ck_ssleay_is_installed() )
        return(0);

    if ( inserver && !tn_deb )
        return(0);

    /* the cipher list *can* be NULL ... useless but it happens! */
    cipher = SSL_get_current_cipher(ssl_con);
    cipher_list = SSL_CIPHER_get_name(cipher);
    SSL_CIPHER_description(cipher,buf,sizeof(buf));
    if (cipher_list==NULL)
        cipher_list="<NULL>";
    printf("[TLS - %s",buf);
    ssl_display_comp(ssl_con);

    if ( server ) {
        cipher_list=SSL_get_shared_ciphers(ssl_con,buf,512);
        if (cipher_list==NULL)
            cipher_list="<NULL>";
        printf("[TLS - shared ciphers=%s]\r\n",
                cipher_list);
        }       
    if ( server || tn_deb ) {
        peer=SSL_get_peer_certificate(ssl_con);
        if (peer != NULL) {
            X509_NAME_oneline(X509_get_subject_name(peer),buf,512);
            printf("[TLS - subject=%s]\r\n",buf);
            X509_NAME_oneline(X509_get_issuer_name(peer),buf,512);
            printf("[TLS - issuer=%s]\r\n",buf);
            /* X509_free(peer); */
        } else if (!tls_is_krb5(0)) {
            if ( !sstelnet && !tcp_incoming ) {
                printf("[TLS - No certificate provided.]\r\n");
                printf(
     "[TLS - The identity of the host could not be verified.]\r\n");
            }
        }
    }
    return(0);
}

/*
 * Use SSL_CTX_set_default_passwd_cb_userdata(SSL_CTX *, void * userdata)
 * to set the value of the userdata.  We are going to use it to store the
 * prompt.
 */

int
#ifdef CK_ANSIC
ssl_passwd_callback(char *buf, int len, int rwflag, VOID * userdata)
#else /* CK_ANSIC */
ssl_passwd_callback(buf,len,w)
    char * buf; int len; int rwflag; VOID *userdata;
#endif /* CK_ANSIC */
{
    extern char pwbuf[];
    extern int  pwflg, pwcrypt;
    int   ok;
    char *prompt=NULL;

    if ( pwbuf[0] && pwflg ) {
        int n;
        n = ckstrncpy(buf,pwbuf,len);
#ifdef OS2
        if ( pwcrypt )
            ck_encrypt((char *)buf);
#endif /* OS2 */
        return(n);
    }

    if ( userdata == NULL )
        prompt="Enter pass phrase: ";
    else
        prompt=(char*)userdata;
    ok = uq_txt(NULL,prompt,1,NULL,buf,len,NULL);
    return(ok > 0 ? strlen(buf) : 0);
}


/* Attempts to load certificate data into the TLS context structures */
/* Returns 1 on success; 0 on failure */
int
tls_load_certs(SSL_CTX * ctx, SSL * con, int server)
{
    int rc = 1;
    extern int quiet;

    if ( !ck_ssleay_is_installed() )
        return(0);

    debug(F111,"tls_load_certs","SSL_CTX",ctx);
    debug(F111,"tls_load_certs","SSL",con);
    debug(F111,"tls_load_certs","server",server);

    if ( con ) {
        if (ssl_rsa_cert_file) {
            if ( ssl_debug_flag )
                printf("Loading RSA certificate into SSL\r\n");

            rc = SSL_use_certificate_file(con, ssl_rsa_cert_file,
                                               X509_FILETYPE_PEM);
            if (!rc)
            {
                if ( !quiet || ssl_debug_flag )
                    printf("Error loading certificate from %s\r\n",
                            ssl_rsa_cert_file);
            } else {
                if (!ssl_rsa_key_file || !ssl_rsa_key_file[0])
                    makestr(&ssl_rsa_key_file,ssl_rsa_cert_file);

                rc = SSL_use_PrivateKey_file(con, ssl_rsa_key_file,
                                                  X509_FILETYPE_PEM);
                if (!rc)
                    rc = SSL_use_PrivateKey_file(con, ssl_rsa_cert_file,
                                                      X509_FILETYPE_PEM);
                if (!rc)
                {
                    if ( !quiet || ssl_debug_flag )
                        printf("Error loading key from %s\r\n",
                                ssl_rsa_key_file);
                } else {
                    rc = SSL_check_private_key(con);
                    if (!rc)
                    {
                        if ( ssl_debug_flag )
                            printf(
                "Private key does not match the certificate public key\r\n");
                    }
                }
            }
        }

        if (ssl_dsa_cert_file) {
            if ( ssl_debug_flag )
                printf("Loading DSA certificate into SSL\r\n");

            rc = SSL_use_certificate_file(con, ssl_dsa_cert_file,
                                               X509_FILETYPE_PEM);
            if (!rc)
            {
                if ( ssl_debug_flag ) {
                    printf("Error loading certificate from %s\r\n",
                            ssl_dsa_cert_file);
                }
            } else {
                if (!ssl_dh_key_file || !ssl_dh_key_file[0])
                    makestr(&ssl_dh_key_file,ssl_dsa_cert_file);
                rc = SSL_use_PrivateKey_file(con, ssl_dh_key_file,
                                                  X509_FILETYPE_PEM);
                if (!rc)
                    rc = SSL_use_PrivateKey_file(con, ssl_dsa_cert_file,
                                                      X509_FILETYPE_PEM);
                if (!rc)
                {
                    if ( !quiet || ssl_debug_flag ) {
                        printf("Error loading key from %s\r\n",
                                ssl_dh_key_file);
                    }
                } else {
                    rc = SSL_check_private_key(con);
                    if (!rc)
                    {
                        if ( ssl_debug_flag )
                            printf(
                   "Private key does not match the certificate public key\n");
                    }
                }
            }
        }
    } else {
        if (ssl_rsa_cert_file) {
            if ( ssl_debug_flag )
                printf("Loading RSA certificate into SSL\r\n");

            rc = SSL_CTX_use_certificate_file(ctx, ssl_rsa_cert_file,
                                       X509_FILETYPE_PEM);
            if (!rc)
            {
                if ( !quiet || ssl_debug_flag )
                    printf("Error loading certificate from %s\r\n",
                            ssl_rsa_cert_file);
            } else {
                if (!ssl_rsa_key_file || !ssl_rsa_key_file[0])
                    makestr(&ssl_rsa_key_file,ssl_rsa_cert_file);

                rc = SSL_CTX_use_PrivateKey_file(ctx, ssl_rsa_key_file,
                                                  X509_FILETYPE_PEM);
                if (!rc)
                  rc = SSL_CTX_use_PrivateKey_file(ctx, ssl_rsa_cert_file,
                                                   X509_FILETYPE_PEM);
                if (!rc) {
                    if ( ssl_debug_flag )
                      printf("Error loading key from %s\r\n",ssl_rsa_key_file);
                } else {
                    rc = SSL_CTX_check_private_key(ctx);
                    if (!rc) {
                        if ( ssl_debug_flag )
                          printf(
                "Private key does not match the certificate public key\r\n");
                    }
                }
            }
        }
        if (ssl_dsa_cert_file) {
            if ( ssl_debug_flag )
              printf("Loading DSA certificate into SSL\r\n");

            rc = SSL_CTX_use_certificate_file(ctx, ssl_dsa_cert_file,
                                              X509_FILETYPE_PEM);
            if (!rc) {
                if ( ssl_debug_flag ) {
                    printf("Error loading certificate from %s\r\n",
                           ssl_dsa_cert_file);
                }
            } else {
                if (!ssl_dh_key_file || !ssl_dh_key_file[0])
                    makestr(&ssl_dh_key_file,ssl_dsa_cert_file);
                rc = SSL_CTX_use_PrivateKey_file(ctx, ssl_dh_key_file,
                                                  X509_FILETYPE_PEM);
                if (!rc)
                  rc = SSL_CTX_use_PrivateKey_file(ctx, ssl_dsa_cert_file,
                                                      X509_FILETYPE_PEM);
                if (!rc) {
                    if ( ssl_debug_flag )
                      printf("Error loading key from %s\r\n",ssl_dh_key_file);
                } else {
                    rc = SSL_CTX_check_private_key(ctx);
                    if (!rc) {
                        if ( ssl_debug_flag )
                          printf(
                   "Private key does not match the certificate public key\n");
                    }
                }
            }
        }
    }

    if (ssl_rsa_cert_chain_file && server) {
        int skip1st = 0;
        if (ssl_debug_flag)
            printf("Loading RSA Certificate Chain into SSL\r\n");
        if (!ckstrcmp(ssl_rsa_cert_chain_file,ssl_rsa_cert_file,-1,
#ifdef OS2
                       0
#else
                       1
#endif /* OS2 */
                       ))
            skip1st = 1;
        rc = SSL_CTX_use_certificate_chain_file(ctx,ssl_rsa_cert_chain_file);
        if (!rc && ssl_debug_flag)
                printf("Error loading RSA Certificate Chain into SSL\r\n");
    }
    if (ssl_dsa_cert_chain_file && server) {
        int skip1st = 0;
        if (ssl_debug_flag)
            printf("Loading DSA Certificate Chain into SSL\r\n");
        if (!ckstrcmp(ssl_dsa_cert_chain_file,ssl_dsa_cert_file,-1,
#ifdef OS2
                       0
#else
                       1
#endif /* OS2 */
                       ))
            skip1st = 1;
        rc = SSL_CTX_use_certificate_chain_file(ctx,ssl_dsa_cert_chain_file);
        if (!rc && ssl_debug_flag)
                printf("Error loading DSA Certificate Chain into SSL\r\n");
    }
    return(rc);
}

VOID
#ifdef CK_ANSIC
ssl_once_init()
#else
ssl_once_init()
#endif /* CK_ANSIC */
{
    COMP_METHOD * cm;

    if ( !ck_ssleay_is_installed() )
        return;

    debug(F111,"Kermit built for OpenSSL",OPENSSL_VERSION_TEXT,SSLEAY_VERSION_NUMBER);
    debug(F111,"OpenSSL Library",SSLeay_version(SSLEAY_VERSION),
           SSLeay());
    debug(F110,"OpenSSL Library",SSLeay_version(SSLEAY_BUILT_ON),0);
    debug(F110,"OpenSSL Library",SSLeay_version(SSLEAY_CFLAGS),0);
    debug(F110,"OpenSSL Library",SSLeay_version(SSLEAY_PLATFORM),0);

    /* The following test is suggested by Richard Levitte */
    if (((OPENSSL_VERSION_NUMBER ^ SSLeay()) & 0xffffff0f) 
#ifdef OS2
         || ckstrcmp(OPENSSL_VERSION_TEXT,(char *)SSLeay_version(SSLEAY_VERSION),-1,1)
#endif /* OS2 */
         ) {
        ssl_installed = 0;
        debug(F111,"OpenSSL Version does not match.  Built with",
               SSLeay_version(SSLEAY_VERSION),SSLEAY_VERSION_NUMBER);
        printf("?OpenSSL libraries do not match required version.");
        printf("  SSL\\TLS support disabled\r\n\r\n");
        bleep(BP_FAIL);
#ifdef SSLDLL
        ck_ssl_unloaddll();
        ck_crypto_unloaddll();
#endif /* SSLDLL */
        return;
    }

    /* init things so we will get meaningful error messages
    * rather than numbers
    */
    SSL_load_error_strings();

    /* SSL_library_init() only loads those ciphers needs for SSL  */
    /* These happen to be a similar set to those requires for SSH */
    /* but they are not a complete set of ciphers provided by the */
    /* crypto library.                                            */
    SSL_library_init();

#ifdef ZLIB
    cm = COMP_zlib();
    if (cm != NULL && cm->type != NID_undef) {
        SSL_COMP_add_compression_method(0xe0, cm); /* EAY's ZLIB ID */
    }
#endif /* ZLIB */
    cm = COMP_rle();
    if (cm != NULL && cm->type != NID_undef)
        SSL_COMP_add_compression_method(0xe1, cm); /* EAY's RLE ID */

    /* Ensure the Random number generator has enough entropy */
    if ( !RAND_status() ) {
        char buffer[256]="";
        char randombytes[256];
        int rc1 = -1, rc2 = 1;  /* assume failure and success */

        debug(F110,"ssl_once_init","!RAND_status()",0);

        if ( ssl_rnd_file == NULL ) {
            debug(F110,"ssl_rnd_file","ssl_rnd_file is NULL",0);
            RAND_file_name(buffer,256);
            if ( buffer[0] )
                makestr(&ssl_rnd_file, buffer);
            else
                makestr(&ssl_rnd_file,".rnd");
        }
        debug(F110,"ssl_rnd_file",ssl_rnd_file,0);

        rc1 = RAND_egd(ssl_rnd_file);
        debug(F111,"ssl_once_init","RAND_egd()",rc1);
        if ( rc1 <= 0 ) {
            rc2 = RAND_load_file(ssl_rnd_file, -1);
            debug(F111,"ssl_once_init","RAND_load_file()",rc1);
        }

        if ( rc1 <= 0 && !rc2 )
        {
            time_t t = time(NULL);
            int tlen = sizeof(time_t);
            int pid = getpid();
            int plen = sizeof(int);
            int n;
#ifndef RAND_MAX
#define RAND_MAX 0x7FFF
#endif
            debug(F110,"ssl_once_init","calling RAND_seed()",0);

            RAND_seed((unsigned char *)&t, tlen);
            RAND_seed((unsigned char *)&pid, plen);

            srand((unsigned int)t);
            sprintf(buffer, "%.0f", (((double)(rand()%RAND_MAX)/RAND_MAX)*
                                      (sizeof(randombytes)-128-1)));
            n = (atoi(buffer)+1)%(sizeof(randombytes)-128-1);
            RAND_seed(randombytes, 128);
        }

        if ( !RAND_status() ) {
            debug(F110,"ssl_once_init","Unable to initialize PRNG",0);
            printf(" Unable to load 'random state'\n");
            printf(" SSL and TLS are unavailble.\n");
            printf(" Use SET AUTH SSL RANDOM-FILE <file> command to provide random data.\n");
            printf(" Specified file will be overwritten with new random data after use.\n");
            return;
        }

        if ( ssl_rnd_file ) {
            int rc = RAND_write_file(ssl_rnd_file);
            debug(F111,"ssl_once_init","RAND_write_file()",rc);
        }
    }
    debug(F100,"ssl_once_init() complete","",0);
}

int
#ifdef CK_ANSIC
ssl_tn_init(int mode)
#else
ssl_tn_init(mode) int mode;
#endif /* CK_ANSIC */
{
#ifdef KRB5
    extern char * k5_keytab;
    extern char * krb5_d_srv;
#endif /* KRB5 */
    static int last_ssl_mode = -1;
    SSL * ssl_conx=NULL, * tls_conx=NULL;

    ssl_initialized = 0;

    if ( !ck_ssleay_is_installed() )
        return(0);

    debug(F111,"ssl_tn_init","mode",mode);

    /* make sure we have somewhere we can log errors to */
    if (bio_err == NULL)
        bio_err=BIO_new(BIO_s_mem());

    if (ssl_debug_flag)
        printf("SSL_DEBUG_FLAG on\r\n");

    if (last_ssl_mode != mode) {
        if (ssl_ctx) {
            SSL_CTX_free(ssl_ctx);
            ssl_ctx = NULL;
        }
        if (tls_ctx) {
            SSL_CTX_free(tls_ctx);
            tls_ctx = NULL;
        }
    }

    if ( (last_ssl_mode != mode) || !ssl_ctx || !tls_ctx ) {
        if ( mode == SSL_CLIENT ) {
            ssl_ctx=(SSL_CTX *)SSL_CTX_new(SSLv23_client_method());
            /* This can fail because we do not have RSA available */
            if ( !ssl_ctx ) {
                debug(F110,"ssl_tn_init","SSLv23_client_method failed",0);
                ssl_ctx=(SSL_CTX *)SSL_CTX_new(SSLv3_client_method());
            }
            if ( !ssl_ctx ) {
                debug(F110,"ssl_tn_init","SSLv3_client_method failed",0);
                last_ssl_mode = -1;
                return(0);
            }
#ifndef COMMENT
            tls_ctx=(SSL_CTX *)SSL_CTX_new(TLSv1_client_method());
#else /* COMMENT */
            tls_ctx=(SSL_CTX *)SSL_CTX_new(SSLv23_client_method());
            /* This can fail because we do not have RSA available */
            if ( !tls_ctx ) {
                debug(F110,"ssl_tn_init","SSLv23_client_method failed",0);
                tls_ctx=(SSL_CTX *)SSL_CTX_new(SSLv3_client_method());
            }
#endif /* COMMENT */
            if ( !tls_ctx ) {
                debug(F110,"ssl_tn_init","TLSv1_client_method failed",0);
                last_ssl_mode = -1;
                return(0);
            }
#ifdef USE_CERT_CB
            SSL_CTX_set_client_cert_cb(ssl_ctx,ssl_client_cert_callback);
            SSL_CTX_set_client_cert_cb(tls_ctx,ssl_client_cert_callback);
#endif /* USE_CERT_CB */
        } else if (mode == SSL_SERVER) {
            /* We are a server */
            ssl_ctx=(SSL_CTX *)SSL_CTX_new(SSLv23_server_method());
            /* This can fail because we do not have RSA available */
            if ( !ssl_ctx ) {
                debug(F110,"ssl_tn_init","SSLv23_server_method failed",0);
                ssl_ctx=(SSL_CTX *)SSL_CTX_new(SSLv3_server_method());
            }
            if ( !ssl_ctx ) {
                debug(F110,"ssl_tn_init","SSLv3_server_method failed",0);
                last_ssl_mode = -1;
                return(0);
            }
#ifdef COMMENT
            tls_ctx=(SSL_CTX *)SSL_CTX_new(TLSv1_server_method());
#else /* COMMENT */
            tls_ctx=(SSL_CTX *)SSL_CTX_new(SSLv23_server_method());
            /* This can fail because we do not have RSA available */
            if ( !tls_ctx ) {
                debug(F110,"ssl_tn_init","SSLv23_server_method failed",0);
                tls_ctx=(SSL_CTX *)SSL_CTX_new(TLSv1_server_method());
            }
#endif /* COMMENT */
            if ( !tls_ctx ) {
                debug(F110,"ssl_tn_init","TLSv1_server_method failed",0);
                last_ssl_mode = -1;
                return(0);
            }
        } else /* Unknown mode */
            return(0);

        if ( !inserver ) {
            SSL_CTX_set_default_passwd_cb(ssl_ctx,
                                   (pem_password_cb *)ssl_passwd_callback);
            SSL_CTX_set_default_passwd_cb(tls_ctx,
                                   (pem_password_cb *)ssl_passwd_callback);
        }

        /* for SSL switch on all the interoperability and bug
         * workarounds so that we will communicate with people
         * that cannot read poorly written specs :-)
         * for TLS be sure to prevent use of SSLv2
         */
        SSL_CTX_set_options(ssl_ctx,SSL_OP_ALL|SSL_OP_NO_SSLv2);
        SSL_CTX_set_options(tls_ctx,
                 SSL_OP_NO_SSLv2|SSL_OP_SINGLE_DH_USE|SSL_OP_EPHEMERAL_RSA);

        SSL_CTX_set_info_callback(ssl_ctx,ssl_client_info_callback);
        SSL_CTX_set_info_callback(tls_ctx,ssl_client_info_callback);

#ifndef COMMENT
        /* Set the proper caching mode */
        if ( mode == SSL_SERVER ) {
            SSL_CTX_set_session_cache_mode(ssl_ctx,SSL_SESS_CACHE_SERVER);
            SSL_CTX_set_session_cache_mode(tls_ctx,SSL_SESS_CACHE_SERVER);
        } else {
            SSL_CTX_set_session_cache_mode(ssl_ctx,SSL_SESS_CACHE_CLIENT);
            SSL_CTX_set_session_cache_mode(tls_ctx,SSL_SESS_CACHE_CLIENT);
        }
        SSL_CTX_set_session_id_context(ssl_ctx,"1",1);
        SSL_CTX_set_session_id_context(tls_ctx,"2",1);
#else /* COMMENT */
        SSL_CTX_set_session_cache_mode(ssl_ctx,SSL_SESS_CACHE_OFF);
        SSL_CTX_set_session_cache_mode(tls_ctx,SSL_SESS_CACHE_OFF);
#endif /* COMMENT */
    }

    /* The server uses defaults for the certificate files. */
    /* The client does not.                                */
    if (mode == SSL_SERVER) {
        char cert_filepath[1024];
        const char * defdir = NULL;
        DH * dh = NULL;

        defdir = getenv("SSL_CERT_DIR");
        if ( !defdir )
            defdir = X509_get_default_cert_dir();
        if ( !defdir )
            defdir = "";

        if (!ssl_rsa_cert_file) {
            /* we need to know the fullpath to the location of the
            * certificate that we will be running with as we cannot
            * be sure of the cwd when we are launched
            */
            sprintf(cert_filepath,"%s/%s",defdir,"telnetd-rsa.pem");
            if (zchki(cert_filepath) > 0)
                makestr(&ssl_rsa_cert_file,cert_filepath);
        }
        if (ssl_rsa_cert_file && !ssl_rsa_key_file) {
            /* we need to know the fullpath to the location of the
            * certificate that we will be running with as we cannot
            * be sure of the cwd when we are launched
            */
            sprintf(cert_filepath,"%s/%s",defdir,"telnetd-rsa-key.pem");
            if (zchki(cert_filepath) > 0)
                makestr(&ssl_rsa_key_file,cert_filepath);
        }
        if (!ssl_dsa_cert_file) {
            /* we need to know the fullpath to the location of the
            * certificate that we will be running with as we cannot
            * be sure of the cwd when we are launched
            */
            sprintf(cert_filepath,"%s/%s",defdir,"telnetd-dsa.pem");
            if (zchki(cert_filepath) > 0)
                makestr(&ssl_dsa_cert_file,cert_filepath);
        }
        if (ssl_dsa_cert_file && !ssl_dh_key_file) {
            /* we need to know the fullpath to the location of the
            * certificate that we will be running with as we cannot
            * be sure of the cwd when we are launched
            */
            sprintf(cert_filepath,"%s/%s",defdir,"telnetd-dsa-key.pem");
            if (zchki(cert_filepath) > 0)
                makestr(&ssl_dh_key_file,cert_filepath);
        }
        if (!ssl_crl_dir) {
            /* we need to know the fullpath to the location of the
            * certificate that we will be running with as we cannot
            * be sure of the cwd when we are launched
            */
            sprintf(cert_filepath,"%s/crl",defdir);
            if (zchki(cert_filepath) > 0)
                makestr(&ssl_crl_dir,cert_filepath);
        }

        if (ssl_only_flag && !tls_load_certs(ssl_ctx,ssl_con,1)) {
            debug(F110,"ssl_tn_init","Unable to load SSL certs",0);
            last_ssl_mode = -1;
            return(0);
        }
        if (tls_only_flag && !tls_load_certs(tls_ctx,tls_con,1)) {
            debug(F110,"ssl_tn_init","Unable to load TLS certs",0);
            last_ssl_mode = -1;
            return(0);
        }

        if ( (last_ssl_mode != mode) || !ssl_ctx || !tls_ctx ) {
            /* we may require a temp 512 bit RSA key because of the
             * wonderful way export things work ... if so we generate
             * one now!
             */

            SSL_CTX_set_tmp_rsa_callback(ssl_ctx, tmp_rsa_cb);
            SSL_CTX_set_tmp_dh_callback( ssl_ctx, tmp_dh_cb);
            SSL_CTX_set_tmp_rsa_callback(tls_ctx, tmp_rsa_cb);
            SSL_CTX_set_tmp_dh_callback( tls_ctx, tmp_dh_cb);

            dh = tmp_dh_cb(NULL,0,512);
            SSL_CTX_set_tmp_dh(ssl_ctx,dh);
            SSL_CTX_set_tmp_dh(tls_ctx,dh);

            /* The following code is only called if we are using a
             * certificate with an RSA public key and where the
             * certificate has a key length less than 512 bits or is
             * marked for signing only.  This is so we can support
             * the greatest legal privacy level with exportable clients.
             */

            if (SSL_CTX_need_tmp_RSA(ssl_ctx) ||
                 SSL_CTX_need_tmp_RSA(tls_ctx))
            {
                RSA *rsa;

                if ( ssl_debug_flag )
                    printf("Generating temp (512 bit) RSA key ...\r\n");
                rsa=RSA_generate_key(512,RSA_F4,NULL,NULL);
                if ( ssl_debug_flag )
                    printf("Generation of temp (512 bit) RSA key done\r\n");

                if (SSL_CTX_need_tmp_RSA(ssl_ctx)) {
                    if (!SSL_CTX_set_tmp_rsa(ssl_ctx,rsa)) {
                        if ( ssl_debug_flag )
                            printf(
  "Failed to assign generated temp RSA key to SSL!\r\n");
                    }
                }
                if (SSL_CTX_need_tmp_RSA(tls_ctx)) {
                    if (!SSL_CTX_set_tmp_rsa(tls_ctx,rsa)) {
                        if ( ssl_debug_flag )
                            printf(
  "Failed to assign generated temp RSA key to TLS!\r\n");
                    }
                }
                RSA_free(rsa);
                if ( ssl_debug_flag )
                    printf("Assigned temp (512 bit) RSA key\r\n");
            }
        }
    }

    /* make sure we will find certificates in the standard
     * location ... otherwise we don't look anywhere for
     * these things which is going to make client certificate
     * exchange rather useless :-)
     * In OS2, default values for ssl_verify_file and ssl_verify_path.
     */

#ifdef OS2
#ifdef NT
    {
        /* The defaults in the SSL crypto library are not appropriate for OS/2 */
        char path[CKMAXPATH];
        extern char exedir[];
        char * GetAppData(int);

        ckmakmsg(path,CKMAXPATH,exedir,"certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,NULL,path);
        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,NULL,path);
        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,NULL,path);

        ckmakmsg(path,CKMAXPATH,exedir,"ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,path,NULL);

        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,path,NULL);

        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,path,NULL);
    }
#else /* NT */
    {
        /* The defaults in the SSL crypto library are not appropriate for OS/2 */
        char path[CKMAXPATH];
        extern char exedir[];

        ckmakmsg(path,CKMAXPATH,exedir,"certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,NULL,path);
        ckmakmsg(path,CKMAXPATH,exedir,"ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_ctx,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,path,NULL);
    }
#endif /* NT */
#else /* OS2 */
    SSL_CTX_set_default_verify_paths(ssl_ctx);
    SSL_CTX_set_default_verify_paths(tls_ctx);
#endif /* OS2 */

    if (ssl_verify_file) {
        if (SSL_CTX_load_verify_locations(tls_ctx,ssl_verify_file,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load ssl_verify_file",ssl_verify_file,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",ssl_verify_file);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,ssl_verify_file,NULL);
    }
    if (ssl_verify_dir) {
        if (SSL_CTX_load_verify_locations(tls_ctx,NULL,ssl_verify_dir) == 0)  {
            debug(F110,"ssl_tn_init unable to load ssl_verify_dir",ssl_verify_dir,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",ssl_verify_dir);
        } else
            SSL_CTX_load_verify_locations(ssl_ctx,NULL,ssl_verify_dir);
    }

    if (mode == SSL_SERVER) {
        SSL_CTX_set_verify(ssl_ctx,
                     ssl_verify_flag?ssl_verify_flag|SSL_VERIFY_CLIENT_ONCE:0,
                           ssl_server_verify_callback);
        SSL_CTX_set_verify(tls_ctx,
                     ssl_verify_flag?ssl_verify_flag|SSL_VERIFY_CLIENT_ONCE:0,
                           ssl_server_verify_callback);
    } else {
        SSL_CTX_set_verify(ssl_ctx,ssl_verify_flag,
                           ssl_client_verify_callback);
        SSL_CTX_set_verify(tls_ctx,ssl_verify_flag,
                           ssl_client_verify_callback);
    }

    /* Free the existing CRL Store */
    if (crl_store) {
        X509_STORE_free(crl_store);
        crl_store = NULL;
    }

    /* set up the new CRL Store */
    crl_store = X509_STORE_new();
    if (crl_store) {
#ifdef OS2
        char path[CKMAXPATH];
        extern char exedir[];

        ckmakmsg(path,CKMAXPATH,exedir,"crls",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,NULL,path) == 0) {
            debug(F110,"ssl_tn_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-dir: %s\r\n",path);
        }
#ifdef NT
        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/crls",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,NULL,path) == 0) {
            debug(F110,"ssl_tn_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-dir: %s\r\n",path);
        }
        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/crls",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,NULL,path) == 0) {
            debug(F110,"ssl_tn_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-dir: %s\r\n",path);
        }
#endif /* NT */
        
        ckmakmsg(path,CKMAXPATH,exedir,"ca_crls.pem",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-file: %s\r\n",path);
        }
#ifdef NT
        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/ca_crls.pem",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-file: %s\r\n",path);
        }
        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/ca_crls.pem",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,path,NULL) == 0) {
            debug(F110,"ssl_tn_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-file: %s\r\n",path);
        }
#endif /* NT */
#endif /* OS2 */

        if (ssl_crl_file || ssl_crl_dir) {
            if (ssl_crl_file &&
                X509_STORE_load_locations(crl_store,ssl_crl_file,NULL) == 0) {
                debug(F110,"ssl_tn_init unable to load ssl_crl_file",ssl_crl_file,0);
                if (ssl_debug_flag)
                    printf("?Unable to load crl-file: %s\r\n",ssl_crl_file);
            }
            if (ssl_crl_dir &&
                X509_STORE_load_locations(crl_store,NULL,ssl_crl_dir) == 0) {
                debug(F110,"ssl_tn_init unable to load ssl_crl_dir",ssl_crl_dir,0);
                if (ssl_debug_flag)
                    printf("?Unable to load crl-dir: %s\r\n",ssl_crl_dir);
            }
        } 
#ifndef OS2
        else {
            X509_STORE_set_default_paths(crl_store);
        }
#endif /* OS2 */
    }

#ifndef COMMENT
    ssl_conx = ssl_con;
    ssl_con=(SSL *)SSL_new(ssl_ctx);
    if ( !ssl_con ) {
        debug(F110,"ssl_tn_init","SSL_new(ssl_con) failed",0);
        last_ssl_mode = -1;
        ssl_con = ssl_conx;
        return(0);
    }
    if (ssl_conx) {
        if ( mode == SSL_CLIENT ) {
            SSL_set_session(ssl_con, SSL_get_session(ssl_conx));
        }
#ifdef SSL_KRB5
        kssl_ctx_free(ssl_conx->kssl_ctx);
#endif /* SSL_KRB5 */
        SSL_free(ssl_conx);
        ssl_conx = NULL;
    }
    tls_conx = tls_con;
    tls_con=(SSL *)SSL_new(tls_ctx);
    if ( !tls_con ) {
        debug(F110,"ssl_tn_init","SSL_new(tls_con) failed",0);
        last_ssl_mode = -1;
        tls_con = tls_conx;
        return(0);
    }
    if (tls_conx) {
        if ( mode == SSL_CLIENT )
            SSL_set_session(tls_con, SSL_get_session(tls_conx));
#ifdef SSL_KRB5
        kssl_ctx_free(tls_conx->kssl_ctx);
#endif /* SSL_KRB5 */
        SSL_free(tls_conx);
        tls_conx = NULL;
    }
#else /* COMMENT */
    /* I don't know why this does not work to reuse the connection. */
    if ( ssl_con ) {
        SSL_clear(ssl_con);
        SSL_set_session(ssl_con,NULL);
        SSL_set_accept_state(ssl_con) ;
    } else {
        ssl_con=(SSL *)SSL_new(ssl_ctx);
        if (!ssl_con) {
            debug(F110,"ssl_tn_init","SSL_new(ssl_ctx) failed",0);
            last_ssl_mode = -1;
            ssl_con = ssl_conx;
            return(0);
        }
    }

    if ( tls_con ) {
        SSL_clear(tls_con);
        SSL_set_session(tls_con,NULL);
        SSL_set_accept_state(tls_con) ;
    } else {
        tls_con=(SSL *)SSL_new(tls_ctx);
        if ( !tls_con ) {
            debug(F110,"ssl_tn_init","SSL_new(tls_ctx) failed",0);
            last_ssl_mode = -1;
            tls_con = tls_conx;
            return(0);
        }
    }
#endif /* COMMENT */

#ifdef SSL_KRB5
#ifndef KRB5_SERVICE_NAME
#define KRB5_SERVICE_NAME    "host"
#endif

    if (ssl_con->kssl_ctx == NULL)
        ssl_con->kssl_ctx = kssl_ctx_new();
    if (tls_con->kssl_ctx == NULL)
    tls_con->kssl_ctx = kssl_ctx_new();
    if (mode == SSL_SERVER) {
        if (ssl_con->kssl_ctx != NULL)
            kssl_ctx_setstring(ssl_con->kssl_ctx, KSSL_KEYTAB, k5_keytab);
        if (tls_con->kssl_ctx != NULL)
            kssl_ctx_setstring(tls_con->kssl_ctx, KSSL_KEYTAB, k5_keytab);
    } else {
        if (ssl_con->kssl_ctx != NULL)
            kssl_ctx_setstring(ssl_con->kssl_ctx, KSSL_SERVER, szHostName);
        if (tls_con->kssl_ctx != NULL)
            kssl_ctx_setstring(tls_con->kssl_ctx, KSSL_SERVER, szHostName);
    }
    kssl_ctx_setstring(ssl_con->kssl_ctx, KSSL_SERVICE,
                        krb5_d_srv ? krb5_d_srv : KRB5_SERVICE_NAME);
    kssl_ctx_setstring(tls_con->kssl_ctx, KSSL_SERVICE,
                        krb5_d_srv ? krb5_d_srv : KRB5_SERVICE_NAME);
#endif /* SSL_KRB5 */

    if (ssl_cipher_list) {
        SSL_set_cipher_list(ssl_con,ssl_cipher_list);
        SSL_set_cipher_list(tls_con,ssl_cipher_list);
    } else {
        char * p;
        if (p = getenv("SSL_CIPHER")) {
            SSL_set_cipher_list(ssl_con,p);
            SSL_set_cipher_list(tls_con,p);
        } else {
#ifdef SSL_KRB5
            SSL_set_cipher_list(ssl_con,
                            "HIGH:MEDIUM:LOW:ADH+3DES:ADH+RC4:ADH+DES:+EXP:KRB5");
            SSL_set_cipher_list(tls_con,
                            "HIGH:MEDIUM:LOW:ADH+3DES:ADH+RC4:ADH+DES:+EXP:KRB5");
#else /* KRB5 */
            SSL_set_cipher_list(ssl_con,
                            "HIGH:MEDIUM:LOW:ADH+3DES:ADH+RC4:ADH+DES:+EXP");
            SSL_set_cipher_list(tls_con,
                            "HIGH:MEDIUM:LOW:ADH+3DES:ADH+RC4:ADH+DES:+EXP");
#endif /* KRB5 */
        }
    }

    ssl_verify_depth = -1;

    if ( ssl_debug_flag )
        printf("SSL/TLS init done!\r\n");

    ssl_initialized = 1;
    last_ssl_mode = mode;
    debug(F110,"ssl_tn_init","done",0);
    return(1);
}

#ifndef NOHTTP
int
#ifdef CK_ANSIC
ssl_http_init(char * hostname)
#else
ssl_http_init(hostname) char * hostname;
#endif /* CK_ANSIC */
{
#ifdef KRB5
    extern char * k5_keytab;
    extern char * krb5_d_srv;
#endif /* KRB5 */
    SSL * tls_conx=NULL;

    ssl_http_initialized = 0;

    if ( !ck_ssleay_is_installed() )
        return(0);
    debug(F110,"ssl_http_init",hostname,0);

    /* make sure we have somewhere we can log errors to */
    if (bio_err == NULL)
        bio_err=BIO_new(BIO_s_mem());

    if (ssl_debug_flag)
        printf("SSL_DEBUG_FLAG on\r\n");

    if (!tls_http_ctx ) {
#ifdef COMMENT
        /* too many web servers still do not support TLSv1 */
        tls_http_ctx=(SSL_CTX *)SSL_CTX_new(TLSv1_client_method());
#else /* COMMENT */
        tls_http_ctx=(SSL_CTX *)SSL_CTX_new(SSLv23_client_method());
        /* This can fail because we do not have RSA available */
        if ( !tls_http_ctx ) {
            debug(F110,"ssl_http_init","SSLv23_client_method failed",0);
            tls_http_ctx=(SSL_CTX *)SSL_CTX_new(SSLv3_client_method());
        }
#endif /* COMMENT */
        if ( !tls_http_ctx ) {
            debug(F110,"ssl_http_init","TLSv1_client_method failed",0);
            return(0);
        }
#ifdef USE_CERT_CB
        SSL_CTX_set_client_cert_cb(tls_http_ctx,ssl_client_cert_callback);
#endif /* USE_CERT_CB */
    }

    SSL_CTX_set_default_passwd_cb(tls_http_ctx,
                                  (pem_password_cb *)ssl_passwd_callback);

    /* for SSL switch on all the interoperability and bug
     * workarounds so that we will communicate with people
     * that cannot read poorly written specs :-)
     * for TLS be sure to prevent use of SSLv2
     */
    SSL_CTX_set_options(tls_http_ctx,
            SSL_OP_NO_SSLv2|SSL_OP_SINGLE_DH_USE|SSL_OP_EPHEMERAL_RSA);

    SSL_CTX_set_info_callback(tls_http_ctx,ssl_client_info_callback);

#ifndef COMMENT
    SSL_CTX_set_session_cache_mode(tls_http_ctx,SSL_SESS_CACHE_CLIENT);
    SSL_CTX_set_session_id_context(tls_http_ctx,"3",1);
#else /* COMMENT */
    SSL_CTX_set_session_cache_mode(tls_http_ctx,SSL_SESS_CACHE_OFF);
#endif /* COMMENT */

    /* make sure we will find certificates in the standard
     * location ... otherwise we don't look anywhere for
     * these things which is going to make client certificate
     * exchange rather useless :-)
     */

#ifdef OS2
#ifdef NT
    {
        /* The defaults in the SSL crypto library are not appropriate for OS/2 */
        char path[CKMAXPATH];
        extern char exedir[];

        ckmakmsg(path,CKMAXPATH,exedir,"certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        }

        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        }

        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        }

        ckmakmsg(path,CKMAXPATH,exedir,"ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        }

        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        }

        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        }
    }
#else /* NT */
    {
        /* The defaults in the SSL crypto library are not appropriate for OS/2 */
        char path[CKMAXPATH];
        extern char exedir[];

        ckmakmsg(path,CKMAXPATH,exedir,"certs",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,NULL,path) == 0)  {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-dir: %s\r\n",path);
        }
        ckmakmsg(path,CKMAXPATH,exedir,"ca_certs.pem",NULL,NULL);
        if (SSL_CTX_load_verify_locations(tls_http_ctx,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load path",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load verify-file: %s\r\n",path);
        }
    }
#endif /* NT */
#else /* OS2 */
    SSL_CTX_set_default_verify_paths(tls_http_ctx);
#endif /* OS2 */

    if (ssl_verify_file &&
        SSL_CTX_load_verify_locations(tls_http_ctx,ssl_verify_file,NULL) == 0)  {
        debug(F110,"ssl_http_init unable to load ssl_verify_file",ssl_verify_file,0);
        if (ssl_debug_flag)
            printf("?Unable to load verify-file: %s\r\n",ssl_verify_file);
    }
    if (ssl_verify_dir &&
        SSL_CTX_load_verify_locations(tls_http_ctx,NULL,ssl_verify_dir) == 0)  {
        debug(F110,"ssl_http_init unable to load ssl_verify_dir",ssl_verify_dir,0);
        if (ssl_debug_flag)
            printf("?Unable to load verify-dir: %s\r\n",ssl_verify_dir);
    }

    SSL_CTX_set_verify(tls_http_ctx,ssl_verify_flag,
                           ssl_client_verify_callback);

    /* Free the existing CRL Store */
    if (crl_store) {
        X509_STORE_free(crl_store);
        crl_store = NULL;
    }

    /* set up the new CRL Store */
    crl_store = X509_STORE_new();
    if (crl_store) {
#ifdef OS2
        char path[CKMAXPATH];
        extern char exedir[];

        ckmakmsg(path,CKMAXPATH,exedir,"crls",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,NULL,path) == 0) {
            debug(F110,"ssl_http_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-dir: %s\r\n",path);
        }
#ifdef NT
        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/crls",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,NULL,path) == 0) {
            debug(F110,"ssl_http_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-dir: %s\r\n",path);
        }
        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/crls",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,NULL,path) == 0) {
            debug(F110,"ssl_http_init unable to load dir",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-dir: %s\r\n",path);
        }
#endif /* NT */
        
        ckmakmsg(path,CKMAXPATH,exedir,"ca_crls.pem",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load file",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-file: %s\r\n",path);
        }
#ifdef NT
        ckmakmsg(path,CKMAXPATH,GetAppData(1),"kermit 95/ca_crls.pem",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load file",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-file: %s\r\n",path);
        }
        ckmakmsg(path,CKMAXPATH,GetAppData(0),"kermit 95/ca_crls.pem",NULL,NULL);
        if (X509_STORE_load_locations(crl_store,path,NULL) == 0) {
            debug(F110,"ssl_http_init unable to load file",path,0);
            if (ssl_debug_flag)
                printf("?Unable to load crl-file: %s\r\n",path);
        }
#endif /* NT */
#endif /* OS2 */

        if (ssl_crl_file || ssl_crl_dir) {
            if (ssl_crl_file &&
                X509_STORE_load_locations(crl_store,ssl_crl_file,NULL) == 0) {
                debug(F110,"ssl_http_init unable to load ssl_crl_file",ssl_crl_file,0);
                if (ssl_debug_flag)
                    printf("?Unable to load crl-file: %s\r\n",ssl_crl_file);
            }
            if (ssl_crl_dir &&
                X509_STORE_load_locations(crl_store,NULL,ssl_crl_dir) == 0) {
                debug(F110,"ssl_http_init unable to load ssl_crl_dir",ssl_crl_dir,0);
                if (ssl_debug_flag)
                    printf("?Unable to load crl-dir: %s\r\n",ssl_crl_dir);
            }
        } else {
            X509_STORE_set_default_paths(crl_store);
        }
    }

#ifndef COMMENT
    tls_conx = tls_http_con;
    tls_http_con=(SSL *)SSL_new(tls_http_ctx);
    if ( !tls_http_con ) {
        debug(F110,"ssl_http_init","SSL_new(tls_http_con) failed",0);
        tls_http_con = tls_conx;
        return(0);
    }
    if (tls_conx) {
        SSL_set_session(tls_http_con, SSL_get_session(tls_conx));
#ifdef SSL_KRB5
        kssl_ctx_free(tls_conx->kssl_ctx);
#endif /* SSL_KRB5 */
        SSL_free(tls_conx);
        tls_conx = NULL;
    }
#else /* COMMENT */
    /* I don't know why this does not work to reuse the connection. */
    if ( tls_http_con ) {
        SSL_clear(tls_http_con);
        SSL_set_session(tls_http_con,NULL);
        SSL_set_accept_state(tls_http_con) ;
    } else {
        tls_http_con=(SSL *)SSL_new(tls_http_ctx);
        if ( !tls_http_con ) {
            debug(F110,"ssl_http_init","SSL_new(tls_http_ctx) failed",0);
            tls_http_con = tls_conx;
            return(0);
        }
    }
#endif /* COMMENT */

#ifdef SSL_KRB5
#ifndef KRB5_SERVICE_NAME
#define KRB5_SERVICE_NAME    "host"
#endif

    if (tls_http_con->kssl_ctx == NULL)
    tls_http_con->kssl_ctx = kssl_ctx_new();
    if (tls_http_con->kssl_ctx != NULL)
        kssl_ctx_setstring(tls_http_con->kssl_ctx, KSSL_SERVER, hostname);

    kssl_ctx_setstring(tls_http_con->kssl_ctx, KSSL_SERVICE,
                        krb5_d_srv ? krb5_d_srv : KRB5_SERVICE_NAME);
#endif /* SSL_KRB5 */

    if (ssl_cipher_list)
        SSL_set_cipher_list(tls_http_con,ssl_cipher_list);
    else {
        char * p;
        if (p = getenv("SSL_CIPHER")) {
            SSL_set_cipher_list(tls_http_con,p);
        } else {
#ifdef SSL_KRB5
            SSL_set_cipher_list(tls_http_con,
                            "HIGH:MEDIUM:LOW:ADH+3DES:ADH+RC4:ADH+DES:+EXP:KRB5");
#else /* KRB5 */
            SSL_set_cipher_list(tls_http_con,
                            "HIGH:MEDIUM:LOW:ADH+3DES:ADH+RC4:ADH+DES:+EXP");
#endif /* KRB5 */
        }
    }

    ssl_verify_depth = -1;

    if ( ssl_debug_flag )
        printf("SSL/TLS init done!\r\n");

    ssl_http_initialized = 1;
    return(1);
}
#endif /* NOHTTP */

char *
ssl_get_dNSName(ssl) SSL * ssl;
{
    static char *dns = NULL;
    X509 *server_cert = NULL;
    int i;
    X509_EXTENSION *ext = NULL;
    STACK_OF(GENERAL_NAME) *ialt = NULL;
    GENERAL_NAME *gen = NULL;

    if ( dns ) {
        free(dns);
        dns = NULL;
    }

    if (server_cert = SSL_get_peer_certificate(ssl)) {
        if ((i = X509_get_ext_by_NID(server_cert, NID_subject_alt_name, -1))<0)
            return NULL;
        if (!(ext = X509_get_ext(server_cert, i)))
            return NULL;
        X509V3_add_standard_extensions();
        if (!(ialt = X509V3_EXT_d2i(ext)))
            return NULL;
        for (i = 0; i < sk_GENERAL_NAME_num(ialt); i++) {
            gen = sk_GENERAL_NAME_value(ialt, i);
            if (gen->type == GEN_DNS) {
                if(!gen->d.ia5 || !gen->d.ia5->length)
                    break;
                dns = malloc(gen->d.ia5->length + 1);
                if (dns) {
                    memcpy(dns, gen->d.ia5->data, gen->d.ia5->length);
                    dns[gen->d.ia5->length] = 0;
                }
                break;
            }
        }
        X509V3_EXT_cleanup();
    }
cleanup:
    if (ialt)           sk_GENERAL_NAME_free(ialt);
    if (server_cert)    X509_free(server_cert);
    return dns;
}

char *
ssl_get_commonName(ssl) SSL * ssl;
{
    static char name[256];
    int err;
    X509 *server_cert;

    if (server_cert = SSL_get_peer_certificate(ssl)) {
        err = X509_NAME_get_text_by_NID(X509_get_subject_name(server_cert),
                NID_commonName, name, sizeof(name));
        X509_free(server_cert);
    }
    if (err > 0)
        return name;
    else
        return NULL;
}

char *
ssl_get_issuer_name(ssl) SSL * ssl;
{
    static char name[256];
    X509 *server_cert;

    name[0] = '\0';
    if (server_cert = SSL_get_peer_certificate(ssl)) {
        X509_NAME_oneline(X509_get_issuer_name(server_cert),name,sizeof(name));
        X509_free(server_cert);
        return name;
    }
    else {
#ifdef COMMENT
      fprintf(stderr, "Warning: No certificate from server!\r\n");
#endif /* COMMENT */
        return NULL;
    }
}

char *
ssl_get_subject_name(ssl) SSL * ssl;
{
    static char name[256];
    X509 *server_cert;

    name[0] = '\0';
    if (server_cert = SSL_get_peer_certificate(ssl)) {
       X509_NAME_oneline(X509_get_subject_name(server_cert),name,sizeof(name));
       X509_free(server_cert);
       return name;
    }
    else
        return NULL;
}

#ifdef COMMENT
#ifdef CK_SSL
            && !(ck_ssleay_is_installed() &&
               (tls_active_flag || ssl_active_flag) &&
               ssl_anonymous_cipher(tls_active_flag?tls_con:ssl_con))
#endif /* CK_SSL */

int
ssl_anonymous_cipher(ssl) SSL * ssl;
{
    X509 * cert;

    if (sstelnet)
        cert = SSL_get_certificate(ssl);
    else
        cert = SSL_get_peer_certificate(ssl);

    if ( cert ) {
        X509_free(cert);
        return 0;
    }
    return 1;
}
#endif /* COMMENT */

/*
  This one is (very much!) based on work by
  Ralf S. Engelschall <rse@engelschall.com>.
  Comments by Ralf.
*/
int
ssl_verify_crl(int ok, X509_STORE_CTX *ctx)
{
    X509_OBJECT obj;
    X509_NAME *subject = NULL;
    X509_NAME *issuer = NULL;
    X509 *xs = NULL;
    X509_CRL *crl = NULL;
    X509_REVOKED *revoked = NULL;
    X509_STORE_CTX * store_ctx = NULL;
    long serial;
    BIO *bio = NULL;
    int i, n, rc;
    char *cp;
    char *cp2;

    /*
     * Unless a revocation store for CRLs was created we
     * cannot do any CRL-based verification, of course.
     */
    if (!crl_store)
        return ok;

    store_ctx = X509_STORE_CTX_new();
    if ( !store_ctx )
        return(ok);

    /*
     * Determine certificate ingredients in advance
     */
    xs      = X509_STORE_CTX_get_current_cert(ctx);
    subject = X509_get_subject_name(xs);
    issuer  = X509_get_issuer_name(xs);

    /*
     * OpenSSL provides the general mechanism to deal with CRLs but does not
     * use them automatically when verifying certificates, so we do it
     * explicitly here. We will check the CRL for the currently checked
     * certificate, if there is such a CRL in the store.
     *
     * We come through this procedure for each certificate in the certificate
     * chain, starting with the root-CA's certificate. At each step we've to
     * both verify the signature on the CRL (to make sure it's a valid CRL)
     * and it's revocation list (to make sure the current certificate isn't
     * revoked).  But because to check the signature on the CRL we need the
     * public key of the issuing CA certificate (which was already processed
     * one round before), we've a little problem. But we can both solve it and
     * at the same time optimize the processing by using the following
     * verification scheme (idea and code snippets borrowed from the GLOBUS
     * project):
     *
     * 1. We'll check the signature of a CRL in each step when we find a CRL
     *    through the _subject_ name of the current certificate. This CRL
     *    itself will be needed the first time in the next round, of course.
     *    But we do the signature processing one round before this where the
     *    public key of the CA is available.
     *
     * 2. We'll check the revocation list of a CRL in each step when
     *    we find a CRL through the _issuer_ name of the current certificate.
     *    This CRLs signature was then already verified one round before.
     *
     * This verification scheme allows a CA to revoke its own certificate as
     * well, of course.
     */

    /*
     * Try to retrieve a CRL corresponding to the _subject_ of
     * the current certificate in order to verify it's integrity.
     */
    memset((char *)&obj, 0, sizeof(obj));
    X509_STORE_CTX_init(store_ctx, crl_store, NULL, NULL);
    rc = X509_STORE_get_by_subject(store_ctx, X509_LU_CRL, subject, &obj);
    X509_STORE_CTX_cleanup(store_ctx);
    crl = obj.data.crl;
    if (rc > 0 && crl != NULL) {
        /*
         * Verify the signature on this CRL
         */
        if (X509_CRL_verify(crl, X509_get_pubkey(xs)) <= 0) {
            fprintf(stderr, "Invalid signature on CRL!\n");
            X509_STORE_CTX_set_error(ctx, X509_V_ERR_CRL_SIGNATURE_FAILURE);
            X509_OBJECT_free_contents(&obj);
            X509_STORE_CTX_free(store_ctx);
            return 0;
        }

        /*
         * Check date of CRL to make sure it's not expired
         */
        i = X509_cmp_current_time(X509_CRL_get_nextUpdate(crl));
        if (i == 0) {
            fprintf(stderr, "Found CRL has invalid nextUpdate field.\n");
            X509_STORE_CTX_set_error(ctx,
                                    X509_V_ERR_ERROR_IN_CRL_NEXT_UPDATE_FIELD);
            X509_OBJECT_free_contents(&obj);
            X509_STORE_CTX_free(store_ctx);
            return 0;
        }
        if (i < 0) {
            fprintf(stderr,
"Found CRL is expired - revoking all certificates until you get updated CRL.\n"
                    );
            X509_STORE_CTX_set_error(ctx, X509_V_ERR_CRL_HAS_EXPIRED);
            X509_OBJECT_free_contents(&obj);
            X509_STORE_CTX_free(store_ctx);
            return 0;
        }
        X509_OBJECT_free_contents(&obj);
    }

    /*
     * Try to retrieve a CRL corresponding to the _issuer_ of
     * the current certificate in order to check for revocation.
     */
    memset((char *)&obj, 0, sizeof(obj));
    X509_STORE_CTX_init(store_ctx, crl_store, NULL, NULL);
    rc = X509_STORE_get_by_subject(store_ctx, X509_LU_CRL, issuer, &obj);
    X509_STORE_CTX_cleanup(store_ctx);
    crl = obj.data.crl;
    if (rc > 0 && crl != NULL) {
        /*
         * Check if the current certificate is revoked by this CRL
         */
        n = sk_X509_REVOKED_num(X509_CRL_get_REVOKED(crl));
        for (i = 0; i < n; i++) {
            revoked = sk_X509_REVOKED_value(X509_CRL_get_REVOKED(crl), i);
            if (ASN1_INTEGER_cmp(revoked->serialNumber,
                                 X509_get_serialNumber(xs)) == 0) {

                serial = ASN1_INTEGER_get(revoked->serialNumber);
                cp = X509_NAME_oneline(issuer, NULL, 0);
                free(cp);

                X509_STORE_CTX_set_error(ctx, X509_V_ERR_CERT_REVOKED);
                X509_OBJECT_free_contents(&obj);
                X509_STORE_CTX_free(store_ctx);
                return 0;
            }
        }
        X509_OBJECT_free_contents(&obj);
    }

    X509_STORE_CTX_free(store_ctx);
    return ok;
}

char *
tls_userid_from_client_cert(ssl) SSL * ssl;
{
    static char cn[256];
    static char *r = cn;
    int err;
    X509 *client_cert;

    if (client_cert = SSL_get_peer_certificate(ssl)) {
        /* call the custom function */
        err = X509_to_user(client_cert, cn, sizeof(cn));
        X509_free(client_cert);
        if (err)
            return r = NULL;
        else
            return r;
    }
    else
        return r = NULL;
}

unsigned char **
tls_get_SAN_objs(SSL * ssl, int type)
/* returns NULL or an array of malloc'ed objects of type `type' from the server's
 * subjectAltName, remember to free() them all!
 */
{
#define NUM_SAN_OBJS 64
    static unsigned char *objs[NUM_SAN_OBJS];
    unsigned char **rv = NULL;
    X509 *server_cert = NULL;
    int i, j;
    X509_EXTENSION *ext = NULL;
    STACK_OF(GENERAL_NAME) *ialt = NULL;
    GENERAL_NAME *gen = NULL;

    memset(objs, 0, sizeof(objs));
    if (server_cert = SSL_get_peer_certificate(ssl)) {
        if ((i = X509_get_ext_by_NID(server_cert, NID_subject_alt_name, -1)) < 0)
            goto eject;
        if (!(ext = X509_get_ext(server_cert, i)))
            goto eject;
        X509V3_add_standard_extensions();
        if (!(ialt = X509V3_EXT_d2i(ext)))
            goto eject;
        rv = objs;
        for (i = 0, j = 0; i < sk_GENERAL_NAME_num(ialt) && j < NUM_SAN_OBJS - 2; i++) {
            gen = sk_GENERAL_NAME_value(ialt, i);
            /* The use of V_ASN1_CONTEXT_SPECIFIC is because OpenSSL 0.9.6 defined its
             * types | V_ASN1_CONTEXT_SPECIFIC.  0.9.7 does not.  In case, we are built
             * with one and linked to the other we use this hack.
             */
            if ((gen->type | V_ASN1_CONTEXT_SPECIFIC) == (type | V_ASN1_CONTEXT_SPECIFIC)) {
                if(!gen->d.ia5 || !gen->d.ia5->length)
                    break;
                objs[j] = malloc(gen->d.ia5->length + 1);
                if (objs[j]) {
                    memcpy(objs[j], gen->d.ia5->data, gen->d.ia5->length);
                    objs[j][gen->d.ia5->length] = 0;
                    j++;
                }
            }
        }
        X509V3_EXT_cleanup();
    }
eject:
    if (ialt)           sk_GENERAL_NAME_free(ialt);
    if (server_cert)    X509_free(server_cert);
    return rv;
}


static int
dNSName_cmp(const char *host, const char *dNSName)
{
    int c1 = 0, c2 = 0, num_comp, rv = -1;
    char *p, *p1, *p2, *host_copy, *dNSName_copy;

    /* first we count the number of domain name components in both parameters.
     * they should be equal many, or it's not a match
     */
    p = (char *) host;
    while (p = strstr(p, ".")) {
        c1++;
        p++;
    }
    p = (char *) dNSName;
    while (p = strstr(p, ".")) {
        c2++;
        p++;
    }
    if (c1 != c2)
        return -1;
    num_comp = c1;

    host_copy = strdup(host);
    dNSName_copy = strdup(dNSName);
    if (host_copy == NULL || dNSName_copy == NULL)
        goto eject;
    /* make substrings by replacing '.' with '\0' */
    p = dNSName_copy;
    while (p = strstr(p, ".")) {
        *p = '\0';
        p++;
    }
    p = host_copy;
    while (p = strstr(p, ".")) {
        *p = '\0';
        p++;
    }

    /* compare each component */
    p1 = host_copy;
    p2 = dNSName_copy;
    for (; num_comp; num_comp--) {
        if (!ckmatch(p2, p1,0,1))
            /* failed match */
            goto eject;
        p1 += strlen(p1) + 1;
        p2 += strlen(p2) + 1;
    }
    /* match ok */
    rv = 0;

  eject:
    if (dNSName_copy)   free(dNSName_copy);
    if (host_copy)      free(host_copy);
    return rv;
}



static int
show_hostname_warning(char *s1, char *s2)
{
    char prefix[1024];
    int ok = 1;
    ckmakxmsg(prefix,1024,
              "Warning: Hostname (\"", s1, 
              "\") does not match server's certificate (\"", s2, "\")\r\n",
              NULL,NULL,NULL,NULL,NULL,NULL,NULL);
    if (ssl_verify_flag)
        ok = uq_ok(prefix,
                    "Continue? (Y/N) ",
                    3, NULL, 0);
    else if (ssl_verbose_flag)
        printf(prefix);
    return(ok);
}

#ifndef HPUX1100
#ifndef SCO_OSR505
#ifndef OpenBSD
#ifndef FREEBSD4
#ifndef LINUX
#ifndef AIX41
#ifndef UW7
#ifndef SOLARIS9
#ifndef SOLARIS8
#ifndef SOLARIS7
static int
inet_aton(char * ipaddress, struct in_addr * ia) {
    struct stringarray * q;
    union {
        unsigned long l;
        unsigned char b[4];
    } dummy;

    q = cksplit(1,0,ipaddress,".","0123456789abcdefACDEF",8,0,0);
    if (q->a_size == 4) {
        dummy.b[0] = atoi(q->a_head[1]);
        dummy.b[1] = atoi(q->a_head[2]);
        dummy.b[2] = atoi(q->a_head[3]);
        dummy.b[3] = atoi(q->a_head[4]);
        ia->s_addr = dummy.l;
        return(ia->s_addr != 0);
    }
    return(0);
}
#endif /* SOLARIS7 */
#endif /* SOLARIS8 */
#endif /* SOLARIS9 */
#endif /* UW7 */
#endif /* AIX41 */
#endif /* LINUX */
#endif /* FREEBSD4 */
#endif /* OpenBSD */
#endif /* SCO_OSR505 */
#endif /* HPUX1100 */

int
ssl_check_server_name(SSL * ssl, char * hostname)
/* returns 0 if hostname and server's cert matches, else -1 */
{
    char * commonName;
    unsigned char ** dNSName;
    unsigned char ** ipAddress;
    struct in_addr ia;
    int rv;

    if (ssl_verbose_flag && !inserver) {
        if (dNSName = tls_get_SAN_objs(ssl,GEN_DNS)) {
            int i = 0;
            for (i = 0; dNSName[i]; i++) {
                printf("Certificate[0] altSubjectName DNS=%s\r\n",dNSName[i]);
                free(dNSName[i]);
            }
        }
        if (ipAddress = tls_get_SAN_objs(ssl,GEN_IPADD)) {
            int i = 0;
            char *server_ip;
            struct in_addr ia;

            for (i = 0; ipAddress[i]; i++) {
                if (ipAddress[i]) {
                    ia.s_addr = *(unsigned long *)ipAddress[i];
                    server_ip = inet_ntoa(ia);
                    printf("Certificate[0] altSubjectName IPAddr=%s\r\n",server_ip);
                }
                free(ipAddress[i]);
            }
            /* ipAddress points to a static - don't free */
        }
        if (dNSName = tls_get_SAN_objs(ssl,GEN_EMAIL)) {
            int i = 0;
            for (i = 0; dNSName[i]; i++) {
                printf("Certificate[0] altSubjectName Email=%s\r\n",dNSName[i]);
                free(dNSName[i]);
            }
        }
        if (dNSName = tls_get_SAN_objs(ssl,GEN_URI)) {
            int i = 0;
            for (i = 0; dNSName[i]; i++) {
                printf("Certificate[0] altSubjectName URI=%s\r\n",dNSName[i]);
                free(dNSName[i]);
            }
        }
        if (dNSName = tls_get_SAN_objs(ssl,GEN_OTHERNAME)) {
            int i = 0;
            for (i = 0; dNSName[i]; i++) {
                printf("Certificate[0] altSubjectName Other=%s\r\n",dNSName[i]);
                free(dNSName[i]);
            }
        }
    }

    /* first we check if `hostname' is in fact an ip address */
    if (inet_aton(hostname, &ia)) {
        ipAddress = tls_get_SAN_objs(ssl,GEN_IPADD);
        if (ipAddress) {
            int i = 0;
            char *server_ip = "UNKNOWN";

            for (i = 0; ipAddress[i]; i++)
                if (*(unsigned long *)ipAddress[i] == ia.s_addr)
                    return 0;

            if (ipAddress[i - 1]) {
                ia.s_addr = *(unsigned long *)ipAddress[i - 1];
                server_ip = inet_ntoa(ia);
            }
            rv = show_hostname_warning(hostname, server_ip) ? 0 : -1;
            for (i = 0; ipAddress[i]; i++)
                free(ipAddress[i]);
        } else {
            rv = show_hostname_warning(hostname, "NO IP IN CERT") ? 0 : -1;
        }
        return(rv);
    }

    /* look for dNSName(s) in subjectAltName in the server's certificate */
    dNSName = tls_get_SAN_objs(ssl,GEN_DNS);
    if (dNSName) {
        int i = 0;
        for (i = 0; dNSName[i]; i++) {
            if (!dNSName_cmp(hostname, dNSName[i]))
                return 0;
        }
        rv = show_hostname_warning(hostname,
        dNSName[i - 1] ? dNSName[i - 1] : (unsigned char *)"UNKNOWN") ? 0 : -1;
        for (i = 0; dNSName[i]; i++)
            free(dNSName[i]);
        return rv;
    } else if ((commonName = ssl_get_commonName(ssl))) {
       /* so the server didn't have any dNSName's, check the commonName */
       if (!dNSName_cmp(hostname, commonName))
           return 0;
       else
           return (show_hostname_warning(hostname, commonName) ? 0 : -1);
    }
    return -1;
}

/* Is 'user' authorized to access the system without a login */
int
tls_is_user_valid(SSL * ssl, const char *user)
{
    X509 *client_cert;
    int r = 0;

    if ( !ssl || !user || !user[0] )
        return(0);

    if (!(client_cert = SSL_get_peer_certificate(ssl)))
        return 0;

    /* Use user supplied function */
    r = X509_userok(client_cert,user);

    X509_free(client_cert);
    return r;
}

int
tls_is_anon(int x)
{
    char buf[128];
    SSL_CIPHER * cipher;
    SSL * ssl = NULL;

    switch ( x ) {
#ifndef NOFTP
#ifndef SYSFTP
    case 1:     /* ftp command */
        if ( ssl_ftp_active_flag )
            ssl = ssl_ftp_con;
        else
            return(0);
        break;
    case 2:     /* ftp data */
        if ( ssl_ftp_data_active_flag )
            ssl = ssl_ftp_data_con;
        else
            return(0);
        break;
#endif /* SYSFTP */
#endif /* NOFTP */
    default:
        if (tls_active_flag)
            ssl = tls_con;
        else if (ssl_active_flag)
            ssl = ssl_con;
        else
            return(0);
    }

    cipher = SSL_get_current_cipher(ssl);
    if (SSL_CIPHER_description(cipher,buf,sizeof(buf))) {
        if (ckindex("Au=None",buf,0,0,0) != 0)
            return(1);                  /* anonymous */
        return(0);                  /* known */
    } else {
        /* could not get cipher description.  Assume anonymous */
        return(1);
    }
}

int
tls_is_krb5(int x)
{
    char buf[128];
    SSL_CIPHER * cipher;
    SSL * ssl = NULL;

    switch ( x ) {
#ifndef NOFTP
#ifndef SYSFTP
    case 1:     /* ftp command */
        if ( ssl_ftp_active_flag )
            ssl = ssl_ftp_con;
        else
            return(0);
        break;
    case 2:     /* ftp data */
        if ( ssl_ftp_data_active_flag )
            ssl = ssl_ftp_data_con;
        else
            return(0);
        break;
#endif /* SYSFTP */
#endif /* NOFTP */
#ifndef NOHTTP
    case 3:
        if ( tls_http_active_flag )
            ssl = tls_http_con;
        break;
#endif /* NOHTTP */
    default:
        if (tls_active_flag)
            ssl = tls_con;
        else if (ssl_active_flag)
            ssl = ssl_con;
        else
            return(0);
    }

    cipher = SSL_get_current_cipher(ssl);
    if (cipher && SSL_CIPHER_description(cipher,buf,sizeof(buf))) {
        if (ckindex("Au=KRB5",buf,0,0,0) != 0)
            return(1);                  /* krb5 */
    }
    return(0);                          /* not */
}

int
ssl_get_client_finished(char *buf, int count)
{
#ifdef NO_GET_FINISHED
    return(0);
#else
    if (sstelnet || tcp_incoming) {
        return(SSL_get_peer_finished(ssl_active_flag?ssl_con:tls_con,
                                      buf,count));
    } else {
        return(SSL_get_finished(ssl_active_flag?ssl_con:tls_con,
                                      buf,count));
    }
#endif /* NO_GET_FINISHED */
}

int
ssl_get_server_finished(char *buf, int count)
{
#ifdef NO_GET_FINISHED
    return(0);
#else
    if (sstelnet || tcp_incoming) {
        return(SSL_get_finished(ssl_active_flag?ssl_con:tls_con,
                                      buf,count));
    } else {
        return(SSL_get_peer_finished(ssl_active_flag?ssl_con:tls_con,
                                      buf,count));
    }
#endif /* NO_GET_FINISHED */
}


#ifdef CK_AUTHENTICATION
int
#ifdef CK_ANSIC
ssl_reply(int how, unsigned char *data, int cnt)
#else
ssl_reply(how,data,cnt) int how; unsigned char *data; int cnt;
#endif
{
    char * str=NULL;

    data += 4;                          /* Point to status byte */
    cnt  -= 4;

    if(cnt-- < 1) {
        auth_finished(AUTH_REJECT);
        return AUTH_FAILURE;
    }

    switch(*data++) {
    case SSL_ACCEPT:
        if (tn_deb || debses)
            tn_debug("[SSL - handshake starting]");
        else if ( ssl_verbose_flag )
            printf("[SSL - handshake starting]\r\n");
        debug(F110,"ssl_reply","[SSL - handshake starting]",0);

        /* right ... now we drop into the SSL library */
        if (!ssl_only_flag) {
            if (ssl_dummy_flag) {
                if (tn_deb || debses)
                    tn_debug("[SSL - Dummy Connected]");
                else if ( ssl_verbose_flag ) {
                    printf("[SSL - Dummy Connected]\r\n");
                }
                debug(F110,"ssl_reply","[SSL - Dummy Connected]",0);
                auth_finished(AUTH_UNKNOWN);
                accept_complete = 1;
                return AUTH_SUCCESS;
            }

            if (SSL_connect(ssl_con) <= 0) {
                int len;
                if (tn_deb || debses) {
                    tn_debug("[SSL - FAILED]");
                    ERR_print_errors(bio_err);
                    len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                    ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                    printf(ssl_err);
                } else if ( ssl_verbose_flag ) {
                    printf("[SSL - FAILED]\r\n");
                    ERR_print_errors(bio_err);
                    len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                    ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                    printf(ssl_err);
                }
                debug(F110,"ssl_reply","[SSL - FAILED]",0);
                auth_finished(AUTH_REJECT);
                ttclos(0);
                return AUTH_FAILURE;
            } else {
                if (tn_deb || debses)
                    tn_debug("[SSL - OK]");
                else if ( ssl_verbose_flag ) {
                    printf("[SSL - OK]\r\n");
                }
                debug(F110,"ssl_reply","[SSL - OK]",0);

                ssl_active_flag = 1;
                ssl_display_connect_details(ssl_con,0,ssl_verbose_flag);
            }
        }
        auth_finished(AUTH_UNKNOWN);
        accept_complete = 1;
        break;

    case SSL_REJECT:
        if (tn_deb || debses) {
            tn_debug(
                 "[SSL - failed to switch on SSL - trying plaintext login]");
        } else if ( ssl_verbose_flag ) {
            printf("[SSL - failed to switch on SSL]\r\n");
            printf("Trying plaintext login:\r\n");
        }
        debug(F110,"ssl_reply","[SSL - failed to switch on SSL]",0);
        auth_finished(AUTH_REJECT);
        return AUTH_FAILURE;

    default:
        return AUTH_FAILURE;
    }
    return AUTH_SUCCESS;
}

int
#ifdef CK_ANSIC
ssl_is(unsigned char *data, int cnt)
#else
ssl_is(data,cnt) unsigned char *data; int cnt;
#endif
{
    if ((cnt -= 4) < 1)
        return AUTH_FAILURE;

    data += 4;
    switch(*data++) {
    case SSL_START:
        /* server starts the SSL stuff now ... */
        if (!ssl_only_flag) {
            if ( !tls_load_certs(ssl_ctx,ssl_con,1) ) {
                auth_finished(AUTH_REJECT);
                return AUTH_FAILURE;
            }

            if (tn_deb || debses)
                tn_debug("[SSL - handshake starting]");
            else if ( ssl_verbose_flag )
                printf("[SSL - handshake starting]\r\n");
            debug(F110,"ssl_is","[SSL - handshake starting]",0);

            SendSSLAuthSB(SSL_ACCEPT, (void *)0, 0);

            auth_ssl_valid = 1;

            if (ssl_dummy_flag) {
                if (tn_deb || debses)
                    tn_debug("[SSL - Dummy Connected]");
                else if ( ssl_verbose_flag ) {
                    printf("[SSL - Dummy Connected]\r\n");
                }
                debug(F110,"ssl_is","[SSL - Dummy Connected]",0);
                accept_complete = 1;
                auth_finished(AUTH_UNKNOWN);
                return AUTH_SUCCESS;
            }

            if (SSL_accept(ssl_con) <= 0) {
                char errbuf[1024];

                sprintf(errbuf,"[SSL - SSL_accept error: %s",
                         ERR_error_string(ERR_get_error(),NULL));

                if (tn_deb || debses)
                    tn_debug(errbuf);
                else if ( ssl_debug_flag )
                    printf("%s\r\n",errbuf);
                else if ( ssl_verbose_flag )
                    printf("[SSL - SSL_accept error]\r\n");

                debug(F110,"ssl_is",errbuf,0);

                auth_finished(AUTH_REJECT);
                ttclos(0);
                return AUTH_FAILURE;
            }

            if (tn_deb || debses)
                tn_debug("[SSL - OK]");
            else if ( ssl_verbose_flag ) {
                printf("[SSL - OK]\r\n");
            }
            debug(F110,"ssl_is","[SSL - OK]",0);
            ssl_active_flag = 1;
            ssl_display_connect_details(ssl_con,1,ssl_verbose_flag);

            /* now check to see that we got exactly what we
            * wanted from the caller ... if a certificate is
            * required then we make 100% sure that we were
            * given one during the handshake (as it is an optional
            * part of SSL)
            */

#ifdef SSL_KRB5
            if ( tls_is_krb5(0) ) {
                if (ssl_con->kssl_ctx->client_princ)
                    debug(F110,"ssl_is KRB5",ssl_con->kssl_ctx->client_princ,0);
            } else
#endif /* SSL_KRB5 */
            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                X509 * peer = SSL_get_peer_certificate(ssl_con);
                if (peer == NULL) {
                    if (tn_deb || debses)
                        tn_debug("[SSL - peer check failed]");
                    else if (ssl_debug_flag)
                        printf("[SSL - peer check failed]\r\n");
                    debug(F110,"ssl_is","[SSL - peer check failed]",0);

                    /* LOGGING REQUIRED HERE! */
                    auth_finished(AUTH_REJECT);
                    return AUTH_FAILURE;
                }
            }
            auth_finished(AUTH_UNKNOWN);
            accept_complete = 1;
        }
        break;

    default:
        SendSSLAuthSB(SSL_REJECT, (void *) "Unknown option received", -1);
        if (tn_deb || debses)
            tn_debug("[SSL - Unknown option received]");
        else
            printf("Unknown SSL option %d\r\n", data[-1]);
        debug(F111,"ssl_is","[SSL - Unknown option received]",data[-1]);
        auth_ssl_valid = 0;
        auth_finished(AUTH_REJECT);
        return(AUTH_FAILURE);
    }
    return AUTH_SUCCESS;
}

#endif /* CK_AUTHENTICATION */

int
ck_tn_tls_negotiate(VOID)
{
    X509 * peer = NULL;
    char str[256], *uid=NULL;
    extern int sstelnet;

    if ( !ck_ssleay_is_installed() )
        return(-1);

    if (sstelnet) {
        /* server starts the TLS stuff now ... */
        if (!tls_only_flag) {
            if ( !tls_load_certs(tls_ctx,tls_con,1) ) {
                auth_finished(AUTH_REJECT);
                return -1;
            }

            if (tn_deb || debses)
                tn_debug("[TLS - handshake starting]");
            else if ( ssl_verbose_flag )
                printf("[TLS - handshake starting]\r\n");
            debug(F110,"ck_tn_tls_negotiate","[TLS - handshake starting]",0);

            if (ssl_dummy_flag) {
                if (tn_deb || debses)
                    tn_debug("[TLS - Dummy Connected]");
                else if ( ssl_verbose_flag ) {
                    printf("[TLS - Dummy Connected]\r\n");
                }
                debug(F110,"ck_tn_tls_negotiate","[TLS - Dummy Connected]",0);
                accept_complete = 1;
                auth_finished(AUTH_REJECT);
                return 0;
            }

            if (SSL_accept(tls_con) <= 0) {
                char errbuf[1024];

                sprintf(errbuf,"[TLS - SSL_accept error: %s",
                         ERR_error_string(ERR_get_error(),NULL));

                if (tn_deb || debses)
                    tn_debug(errbuf);
                else if ( ssl_debug_flag )
                    printf("%s\r\n",errbuf);
                else if ( ssl_verbose_flag )
                    printf("[TLS - SSL_accept error]\r\n");

                debug(F110,"ck_tn_tls_negotiate",errbuf,0);
                auth_finished(AUTH_REJECT);
                return -1;
            }

            if (tn_deb || debses)
                tn_debug("[TLS - OK]");
            else if ( ssl_verbose_flag ) {
                printf("[TLS - OK]\r\n");
            }

            debug(F110,"ck_tn_tls_negotiate","[TLS - OK]",0);
            tls_active_flag = 1;
            ssl_display_connect_details(tls_con,1,ssl_verbose_flag);


#ifdef SSL_KRB5
            if ( tls_is_krb5(0) ) {
                if (tls_con->kssl_ctx->client_princ) {
                    char *p;
                    ckstrncpy(szUserNameAuthenticated,
                               tls_con->kssl_ctx->client_princ,
                               UIDBUFLEN);
                    ckstrncpy(szUserNameRequested,
                               tls_con->kssl_ctx->client_princ,
                               UIDBUFLEN);
                    for ( p = szUserNameRequested; *p ; p++ ) {
                        if ( *p == '@' || *p == '/' ) {
                            *p = '\0';
                            break;
                        }
                    }
                } else {
                    szUserNameRequested[0] = '\0';
                    szUserNameAuthenticated[0] = '\0';
                }
#ifdef CK_LOGIN
                if (zvuser(szUserNameRequested))
                    auth_finished(AUTH_VALID);
                else
#endif /* CK_LOGIN */
                    auth_finished(AUTH_USER);
            } else
#endif /* SSL_KRB5 */
            {
            /* now check to see that we got exactly what we
            * wanted from the caller ... if a certificate is
            * required then we make 100% sure that we were
            * given one during the handshake (as it is an optional
            * part of TLS)
            */
            peer=SSL_get_peer_certificate(tls_con);
            if (peer == NULL) {
                debug(F100,"SSL_get_peer_certificate() == NULL","",0);
                auth_finished(AUTH_REJECT);
                if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                    if (tn_deb || debses)
                        tn_debug("[TLS - peer check failed]");
                    else if (ssl_debug_flag) {
                        printf("[TLS - peer check failed]\r\n");
                    }
                    debug(F110,
                           "ck_tn_tls_negotiate",
                           "[TLS - peer check failed]",
                           0
                           );
                    /* LOGGING REQUIRED HERE! */
                    return -1;
                }
            } else {
                debug(F100,"SSL_get_peer_certificate() != NULL","",0);
                X509_NAME_get_text_by_NID(X509_get_subject_name(peer),
                                           NID_commonName,str,
                                           256
                                           );
                if ( ssl_verbose_flag )
                    printf("[TLS - commonName=%s]\r\n",str);

                X509_NAME_get_text_by_NID(X509_get_subject_name(peer),
#ifndef NID_x500UniqueIdentifier
                                           NID_uniqueIdentifier,
#else
                                           NID_x500UniqueIdentifier,
#endif
                                           str,
                                           256
                                           );
                if ( ssl_verbose_flag )
                    printf("[TLS - uniqueIdentifier=%s]\r\n",str);

                /* Try to determine user name */
                uid = tls_userid_from_client_cert(tls_con);
                if ( uid ) {
                    /* This code is very questionable.
                     * How should it behave?
                     * The client has presented a certificate that
                     * contains a username.  We have validated the
                     * certificate but we do not automatically
                     * log the user in unless there is a .tlslogin
                     * file.
                     */

                    ckstrncpy(szUserNameRequested,uid,UIDBUFLEN);
#ifdef CK_LOGIN
                    if (zvuser(uid))
                        auth_finished(AUTH_VALID);
                    else
#endif /* CK_LOGIN */
                        auth_finished(AUTH_USER);
                }
                else {
                    szUserNameRequested[0] = '\0';
                    auth_finished(AUTH_REJECT);
                }
            }
            }
        }
    } else {
        char * str=NULL;

        if (tn_deb || debses)
            tn_debug("[TLS - handshake starting]");
        else if ( ssl_verbose_flag )
            printf("[TLS - handshake starting]\r\n");
        debug(F110,"ck_tn_tls_negotiate","[TLS - handshake starting]",0);

        /* right ... now we drop into the SSL library */
        if (!tls_only_flag) {
            char *subject=NULL, *issuer=NULL, *commonName=NULL, *dNSName=NULL;

            if (ssl_dummy_flag) {
                if (tn_deb || debses)
                    tn_debug("[TLS - Dummy Connected]");
                else if ( ssl_verbose_flag ) {
                    printf("[TLS - Dummy Connected]\r\n");
                }
                debug(F110,"ck_tn_tls_negotiate","[TLS - Dummy Connected]",0);
                auth_finished(AUTH_REJECT);
                accept_complete = 1;
                return 0;
            }

#ifndef USE_CERT_CB
            if (!tls_load_certs(tls_ctx,tls_con,0))
                return(-1);
#endif /* USE_CERT_CB */
            if (SSL_connect(tls_con) <= 0) {
                int len;
                if (tn_deb || debses) {
                    tn_debug("[TLS - FAILED]");
                    ERR_print_errors(bio_err);
                    len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                    ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                    printf(ssl_err);
                } else if ( ssl_verbose_flag ) {
                    printf("[TLS - FAILED]\r\n");
                    ERR_print_errors(bio_err);
                    len = BIO_read(bio_err,ssl_err,SSL_ERR_BFSZ);
                    ssl_err[len < SSL_ERR_BFSZ ? len : SSL_ERR_BFSZ] = '\0';
                    printf(ssl_err);
                }
                debug(F110,"ck_tn_tls_negotiate","[TLS - FAILED]",0);
                auth_finished(AUTH_REJECT);
                return -1;
            }

            tls_active_flag = 1;
            if ( !ssl_certsok_flag && (ssl_verify_flag & SSL_VERIFY_PEER)
                 && !tls_is_krb5(0)) {
                char prmpt[1024];
                subject = ssl_get_subject_name(tls_con);

                if (!subject) {
                    if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
                    {
                        if (tn_deb || debses)
                            tn_debug("[TLS - FAILED]");
                        else if ( ssl_verbose_flag )
                            printf("[TLS - FAILED]\r\n");
                        debug(F110,"ck_tn_tls_negotiate","[TLS - FAILED]",0);
                        auth_finished(AUTH_REJECT);
                        return -1;
                    } else {
                        int ok;
                        ok = uq_ok("Warning: Server didn't provide a certificate\r\n",
                                   "Continue? (Y/N)", 3, NULL, 0);
                        if (!ok) {
                            if (tn_deb || debses)
                                tn_debug("[TLS - FAILED]");
                            else if ( ssl_verbose_flag )
                                printf("[TLS - FAILED]\r\n");
                            debug(F110,
                                   "ck_tn_tls_negotiate","[TLS - FAILED]",0);
                            auth_finished(AUTH_REJECT);
                            return -1;
                        }
                    }
                } else if (ssl_check_server_name(tls_con, szHostName)) {
                    if (tn_deb || debses)
                        tn_debug("[TLS - FAILED]");
                    else if ( ssl_verbose_flag )
                        printf("[TLS - FAILED]\r\n");
                    debug(F110,
                           "ck_tn_tls_negotiate","[TLS - FAILED]",0);
                    auth_finished(AUTH_REJECT);
                    return -1;
                }
            }

            if ( ssl_debug_flag && ssl_finished_messages) {
                char msg[32];
                int i, len=32;
                extern char tn_msg[], hexbuf[];

                tn_msg[0] = '\0';
                len = ssl_get_client_finished(msg,len);
                if ( len > 0 ) {
                    for ( i=0;i<len;i++ ) {
                        sprintf(hexbuf,"%02X ",msg[i]);
                        ckstrncat(tn_msg,hexbuf,TN_MSG_LEN);
                    }
                    printf("TLS client finished: %s\r\n",tn_msg);
                }
                tn_msg[0] = '\0';
                len = ssl_get_server_finished(msg,len);
                if ( len > 0 ) {
                    for ( i=0;i<len;i++ ) {
                        sprintf(hexbuf,"%02X ",msg[i]);
                        ckstrncat(tn_msg,hexbuf,TN_MSG_LEN);
                    }
                    printf("TLS server finished: %s\r\n",tn_msg);
                }
            }

            if (tn_deb || debses)
                tn_debug("[TLS - OK]");
            else if ( ssl_verbose_flag )
                printf("[TLS - OK]\r\n");
            debug(F110,"ck_tn_tls_negotiate","[TLS - OK]",0);

            ssl_display_connect_details(tls_con,0,ssl_verbose_flag);
        }
        auth_finished(AUTH_REJECT);
    }
    accept_complete = 1;
    auth_ssl_valid = 1;
    return(0);
}

int
ck_ssl_incoming(fd) int fd;
{
    /* if we are not running in debug then any error
    * stuff from SSL debug *must* not go down
    * the socket (which 0,1,2 are all pointing to by
    * default)
    */

    int timo = 2000;

    if ( !ck_ssleay_is_installed() )
        return(-1);

    /* do the SSL stuff now ... before we play with pty's */
    SSL_set_fd(ssl_con,fd);
    SSL_set_fd(tls_con,fd);

    if (tls_only_flag) {
        if (tn_deb || debses)
            tn_debug("[TLS - handshake starting]");
        else if ( ssl_verbose_flag )
            printf("[TLS - handshake starting]\r\n");
        debug(F110,"ck_ssl_incoming","[TLS - handshake starting]",0);

        /* hmm ... only when running talking to things like
        * https servers should we hit this code and then
        * we really don't care *who* we talk to :-)
        */
        if (SSL_accept(tls_con) <= 0) {
            char errbuf[1024];

            sprintf(errbuf,"[TLS - SSL_accept error: %s",
                     ERR_error_string(ERR_get_error(),NULL));

            if (tn_deb || debses)
                tn_debug(errbuf);
            else if ( ssl_debug_flag )
                printf("%s\r\n",errbuf);
            else if ( ssl_verbose_flag )
                printf("[TLS - SSL_accept error]\r\n");

            debug(F110,"ck_ssl_incoming",errbuf,0);
            return(-1);
        } else {
            if (tn_deb || debses)
                tn_debug("[TLS - OK]");
            else if ( ssl_verbose_flag )
                printf("[TLS - OK]\r\n");
            debug(F110,"ck_ssl_incoming","[TLS - OK]",0);
            tls_active_flag = 1;
        }
    } else if (ssl_only_flag) {
        if (tn_deb || debses)
            tn_debug("[SSL - handshake starting]");
        else if ( ssl_verbose_flag )
            printf("[SSL - handshake starting]\r\n");
        debug(F110,"ck_ssl_incoming","[SSL - handshake starting]",0);

        /* hmm ... only when running talking to things like
         * https servers should we hit this code and then
         * we really don't care *who* we talk to :-)
         */
        if (SSL_accept(ssl_con) <= 0) {
            char errbuf[1024];

            sprintf(errbuf,"[SSL - SSL_accept error: %s",
                     ERR_error_string(ERR_get_error(),NULL));

            if (tn_deb || debses)
                tn_debug(errbuf);
            else if ( ssl_debug_flag )
                printf("%s\r\n",errbuf);
            else if ( ssl_verbose_flag )
                printf("[SSL - SSL_accept error]\r\n");

            debug(F110,"ck_ssl_incoming",errbuf,0);
            return(-1);
        } else {
            if (tn_deb || debses)
                tn_debug("[SSL - OK]");
            else if ( ssl_verbose_flag )
            printf("[SSL - OK]\r\n");
            debug(F110,"ssl_is","[SSL - OK]",0);
            ssl_active_flag = 1;
        }
    }
    if (ssl_active_flag || tls_active_flag) {
        X509 *peer;
        char str[256], *uid=NULL;

        /* now check to see that we got exactly what we
         * wanted from the caller ... if a certificate is
         * required then we make 100% sure that we were
         * given on during the handshake (as it is an optional
         * part of SSL and TLS)
         */

        if ( tls_active_flag ) {
            peer=SSL_get_peer_certificate(tls_con);
        } else if ( ssl_active_flag ) {
            peer=SSL_get_peer_certificate(ssl_con);
        }

        if (peer == NULL) {
            debug(F100,"SSL_get_peer_certificate() == NULL","",0);
            auth_finished(AUTH_REJECT);

            if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT) {
                if (tn_deb || debses)
                    tn_debug("[SSL/TLS - peer check failed]");
                else if (ssl_debug_flag) {
                    printf("[SSL/TLS - peer check failed]\r\n");
                }
                debug(F110,
                       "ck_tn_tls_negotiate",
                       "[SSL/TLS - peer check failed]",
                       0
                       );
                /* LOGGING REQUIRED HERE! */
                return -1;
            }

        } else {
            debug(F100,"SSL_get_peer_certificate() != NULL","",0);
            X509_NAME_get_text_by_NID(X509_get_subject_name(peer),
                                       NID_commonName,str,
                                       256
                                       );
            printf("[TLS - commonName=%s]\r\n",str);

            X509_NAME_get_text_by_NID(X509_get_subject_name(peer),
#ifndef NID_x500UniqueIdentifier
                                       NID_uniqueIdentifier,
#else   
                                       NID_x500UniqueIdentifier,
#endif
                                       str,256
                                       );
            printf("[TLS - uniqueIdentifier=%s]\r\n",str);

            /* Try to determine user name */
            uid = tls_userid_from_client_cert(tls_con);
            if ( uid ) {
                /* This code is very questionable.
                * How should it behave?
                * The client has presented a certificate that
                * contains a username.  We have validated the
                * certificate but we do not automatically
                * log the user in unless there is a .tlslogin
                * file.
                */

                ckstrncpy(szUserNameRequested,uid,UIDBUFLEN);
#ifdef CK_LOGIN
                if (zvuser(uid))
                    auth_finished(AUTH_VALID);
                else
#endif /* CK_LOGIN */
                    auth_finished(AUTH_USER);
            }
            else {
                szUserNameRequested[0] = '\0';
                auth_finished(AUTH_REJECT);
            }
        }
    }
    return(0);  /* success */
}

int
ck_ssl_outgoing(fd) int fd;
{
    int timo = 2000;

    if ( !ck_ssleay_is_installed() )
        return(-1);

    /* bind in the network descriptor */
    SSL_set_fd(ssl_con,fd);
    SSL_set_fd(tls_con,fd);

    /* If we are doing raw TLS then start it now ... */
    if (tls_only_flag) {
#ifndef USE_CERT_CB
        if (!tls_load_certs(tls_ctx,tls_con,0)) {
            debug(F110,"ck_ssl_outgoing","tls_load_certs() failed",0);
            return(-1);
        }
#endif /* USE_CERT_CB */
        if (tn_deb || debses)
            tn_debug("[TLS - handshake starting]");
        else if (ssl_verbose_flag)
            printf("[TLS - handshake starting]\r\n");
        debug(F110,"ck_ssl_outgoing","[TLS - handshake starting]",0);
        if (SSL_connect(tls_con) <= 0) {
            char errbuf[1024];

            sprintf(errbuf,"[TLS - SSL_connect error: %s",
                     ERR_error_string(ERR_get_error(),NULL));

            if (tn_deb || debses)
                tn_debug(errbuf);
            else if ( ssl_debug_flag )
                printf("%s\r\n",errbuf);

            if (tn_deb || debses)
                tn_debug("[TLS - FAILED]");
            else if ( ssl_verbose_flag )
                printf("[TLS - FAILED]\r\n");
            debug(F110,"ck_ssl_outgoing","[TLS - FAILED]",0);
            netclos();
            return(-1);
        } else {
            tls_active_flag = 1;
            if ( !ssl_certsok_flag && (ssl_verify_flag & SSL_VERIFY_PEER) && 
                 !tls_is_krb5(0) ) {
                char *subject = ssl_get_subject_name(tls_con);

                if (!subject) {
                    if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
                    {
                        if (tn_deb || debses)
                            tn_debug("[TLS - FAILED]");
                        else if ( ssl_verbose_flag )
                            printf("[TLS - FAILED]\r\n");
                        debug(F110,"ck_tn_tls_negotiate","[TLS - FAILED]",0);

                        auth_finished(AUTH_REJECT);
                        return -1;
                    } else {
                        char prmpt[1024];
                        int ok;
                        ok = uq_ok("Warning: Server didn't provide a certificate\r\n",
                                   "Continue? (Y/N)", 3, NULL, 0);
                        if (!ok) {
                            if (tn_deb || debses)
                                tn_debug("[TLS - FAILED]");
                            else if ( ssl_verbose_flag )
                                printf("[TLS - FAILED]\r\n");
                            debug(F110,
                                   "ck_tn_tls_negotiate","[TLS - FAILED]",0);
                            auth_finished(AUTH_REJECT);
                            return -1;
                        }
                    }
                } else if (ssl_check_server_name(tls_con, szHostName)) {
                    if (tn_deb || debses)
                        tn_debug("[TLS - FAILED]");
                    else if ( ssl_verbose_flag )
                        printf("[TLS - FAILED]\r\n");
                    debug(F110,
                           "ck_tn_tls_negotiate","[TLS - FAILED]",0);
                    auth_finished(AUTH_REJECT);
                    return -1;
                }
            }

            printf("[TLS - OK]\r\n");
            if (tn_deb || debses)
                tn_debug("[TLS - OK]");
            debug(F110,"ck_ssl_outgoing","[TLS - OK]",0);
            ssl_display_connect_details(tls_con,0,ssl_verbose_flag);
        }
    }
    /* if we are doing raw SSL then start it now ... */
    else if (ssl_only_flag) {
#ifndef USE_CERT_CB
        if (!tls_load_certs(ssl_ctx,ssl_con,0))
            return(-1);
#endif /* USE_CERT_CB */
        if (tn_deb || debses)
            tn_debug("[SSL - handshake starting]");
        else if ( ssl_verbose_flag )
            printf("[SSL - handshake starting]\r\n");
        debug(F110,"ck_ssl_outgoing","[SSL - handshake starting]",0);
        if (SSL_connect(ssl_con) <= 0) {
            if ( ssl_debug_flag ) {
                char errbuf[1024];

                sprintf(errbuf,"[SSL - SSL_connect error: %s",
                         ERR_error_string(ERR_get_error(),NULL));
                printf("%s\r\n",errbuf);
            }
            if (tn_deb || debses)
                tn_debug("[SSL - FAILED]");
            else if ( ssl_verbose_flag )
                printf("[SSL - FAILED]\r\n");
            debug(F110,"ck_ssl_outgoing","[SSL - FAILED]",0);
            return(-1);
        } else {
            ssl_active_flag = 1;

            if ( !ssl_certsok_flag && (ssl_verify_flag & SSL_VERIFY_PEER) &&
                 !tls_is_krb5(0)) {
                char *subject = ssl_get_subject_name(ssl_con);

                if (!subject) {
                    if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
                    {
                        if (tn_deb || debses)
                            tn_debug("[SSL - FAILED]");
                        else if ( ssl_verbose_flag )
                            printf("[SSL - FAILED]\r\n");
                        debug(F110,"ck_tn_tls_negotiate","[SSL - FAILED]",0);

                        auth_finished(AUTH_REJECT);
                        return -1;
                    } else {
                        char prmpt[1024];
                        int ok;
                        ok = uq_ok("Warning: Server didn't provide a certificate\r\n",
                                   "Continue? (Y/N)", 3, NULL, 0);
                        if (!ok) {
                            if (tn_deb || debses)
                                tn_debug("[SSL - FAILED]");
                            else if ( ssl_verbose_flag )
                                printf("[SSL - FAILED]\r\n");
                            debug(F110,
                                   "ck_tn_tls_negotiate","[SSL - FAILED]",0);
                            auth_finished(AUTH_REJECT);
                            return -1;
                        }
                    }
                } else if (ssl_check_server_name(ssl_con, szHostName)) {
                    if (tn_deb || debses)
                        tn_debug("[SSL - FAILED]");
                    else if ( ssl_verbose_flag )
                        printf("[SSL - FAILED]\r\n");
                    debug(F110, "ck_tn_tls_negotiate","[SSL - FAILED]",0);
                    auth_finished(AUTH_REJECT);
                    return -1;
                }
            }

            printf("[SSL - OK]\r\n");
            if (tn_deb || debses)
                tn_debug("[SSL - OK]");
            debug(F110,"ck_ssl_outgoing","[SSL - OK]",0);
            ssl_display_connect_details(ssl_con,0,ssl_verbose_flag);
        }
    }
    return(0);  /* success */
}

#ifndef NOHTTP
int
ck_ssl_http_client(fd, hostname) int fd; char * hostname;
{
    int timo = 2000;

    if ( !ck_ssleay_is_installed() )
        return(-1);

    /* bind in the network descriptor */
    SSL_set_fd(tls_http_con,fd);

    /* If we are doing raw TLS then start it now ... */
    if (1) {
#ifndef USE_CERT_CB
        if (!tls_load_certs(tls_http_ctx,tls_http_con,0)) {
            debug(F110,"ck_ssl_http_client","tls_load_certs() failed",0);
            return(-1);
        }
#endif /* USE_CERT_CB */
        if (tn_deb || debses)
            tn_debug("[TLS - handshake starting]");
        else if (ssl_verbose_flag)
            printf("[TLS - handshake starting]\r\n");
        debug(F110,"ck_ssl_outgoing","[TLS - handshake starting]",0);
        if (SSL_connect(tls_http_con) <= 0) {
            char errbuf[1024];

            sprintf(errbuf,"[TLS - SSL_connect error: %s",
                     ERR_error_string(ERR_get_error(),NULL));

            if (tn_deb || debses)
                tn_debug(errbuf);
            else if ( ssl_debug_flag )
                printf("%s\r\n",errbuf);

            if (tn_deb || debses)
                tn_debug("[TLS - FAILED]");
            else if ( ssl_verbose_flag )
                printf("[TLS - FAILED]\r\n");
            debug(F110,"ck_ssl_http_client","[TLS - FAILED]",0);
            http_close();
            return(-1);
        } else {
            tls_http_active_flag = 1;
            if ( !ssl_certsok_flag && (ssl_verify_flag & SSL_VERIFY_PEER) &&
                 !tls_is_krb5(3) ) {
                char *subject = ssl_get_subject_name(tls_http_con);

                if (!subject) {
                    if (ssl_verify_flag & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
                    {
                        if (tn_deb || debses)
                            tn_debug("[TLS - FAILED]");
                        else if ( ssl_verbose_flag )
                            printf("[TLS - FAILED]\r\n");
                        debug(F110,"ck_tn_tls_negotiate","[TLS - FAILED]",0);
                        return -1;
                    } else {
                        char prmpt[1024];
                        int ok;
                        ok = uq_ok("Warning: Server didn't provide a certificate\r\n",
                                   "Continue? (Y/N)", 3, NULL, 0);
                        if (!ok) {
                            if (tn_deb || debses)
                                tn_debug("[TLS - FAILED]");
                            else if ( ssl_verbose_flag )
                                printf("[TLS - FAILED]\r\n");
                            debug(F110,
                                   "ck_tn_tls_negotiate","[TLS - FAILED]",0);
                            return -1;
                        }
                    }
                } else if (ssl_check_server_name(tls_http_con, hostname)) {
                    if (tn_deb || debses)
                        tn_debug("[TLS - FAILED]");
                    else if ( ssl_verbose_flag )
                        printf("[TLS - FAILED]\r\n");
                    debug(F110,
                           "ck_tn_tls_negotiate","[TLS - FAILED]",0);
                    return -1;
                }
            }

            printf("[TLS - OK]\r\n");
            if (tn_deb || debses)
                tn_debug("[TLS - OK]");
            debug(F110,"ck_ssl_outgoing","[TLS - OK]",0);
            ssl_display_connect_details(tls_http_con,0,ssl_verbose_flag);
        }
    }
    return(0);  /* success */
}
#endif /* NOHTTP */
int
ck_ssl_renegotiate_ciphers()
{

    if ( !ck_ssleay_is_installed() )
        return(0);

    if ( !sstelnet )
        return(0);

    if ( ssl_active_flag )
        return SSL_renegotiate(ssl_con);
    else if ( tls_active_flag )
        return SSL_renegotiate(tls_con);
    return(0);
}

#ifndef OS2
/* The following function should be replaced by institution specific */
/* code that will convert an X509 cert structure to a userid for the */
/* purposes of client to host login.  The example code included      */
/* simply returns the UID field of the Subject if it exists.         */

/* X509_to_user() returns 0 if valid userid in 'userid', else -1 */
int
X509_to_user(X509 *peer_cert, char *userid, int len)
{
#ifdef X509_UID_TO_USER
    /* BEGIN EXAMPLE */
    int err;

    if (!(peer_cert && userid) || len <= 0)
        return -1;

    userid[0] = '\0';
    debug(F110,"X509_to_user() subject",
           X509_NAME_oneline(X509_get_subject_name(peer_cert),NULL,0),0);

    /* userid is in cert subject /UID */
    err = X509_NAME_get_text_by_NID(X509_get_subject_name(peer_cert),
#ifndef NID_x500UniqueIdentifier
                                     NID_uniqueIdentifier,
#else
                                     NID_x500UniqueIdentifier,
#endif
                                     userid, len);

    debug(F111,"X509_to_user() userid",userid,err);
    if (err > 0)
        return 0;

    /* END EXAMPLE */
#else /* X509_UID_TO_USER */
#ifdef X509_SUBJECT_ALT_NAME_TO_USER
    /* BEGIN EXAMPLE */
    int i;
    X509_EXTENSION *ext = NULL;
    STACK_OF(GENERAL_NAME) *ialt = NULL;
    GENERAL_NAME *gen = NULL;
    char email[256];

    if (!(peer_cert && userid) || len <= 0)
        return -1;

    userid[0] = '\0';
    email[0] = '\0';
    debug(F110,"X509_to_user() subject",
           X509_NAME_oneline(X509_get_subject_name(peer_cert),NULL,0),0);

    if ((i = X509_get_ext_by_NID(server_cert, NID_subject_alt_name, -1))<0)
        return -1;
    if (!(ext = X509_get_ext(server_cert, i)))
        return -1;
    X509V3_add_standard_extensions();
    if (!(ialt = X509V3_EXT_d2i(ext)))
        return -1;
    for (i = 0; i < sk_GENERAL_NAME_num(ialt); i++) {
        gen = sk_GENERAL_NAME_value(ialt, i);
        if (gen->type == GEN_DNS) {
            if(!gen->d.ia5 || !gen->d.ia5->length)
                break;
            if ( gen->d.ia5->length + 1 > sizeof(email) ) {
                goto cleanup;
            }
            memcpy(email, gen->d.ia5->data, gen->d.ia5->length);
            email[gen->d.ia5->length] = 0;
            break;
        }
    }
  cleanup:
    X509V3_EXT_cleanup();
    if (ialt)
        sk_GENERAL_NAME_free(ialt);

    debug(F110,"X509_to_user() email",email,0);

    if ( email[0] ) {
        char * domain = NULL;

        /* Find domain */
        for ( i=0 ; email[i] ; i++ ) {
            if ( email[i] == '@' ) {
                email[i] = '\0';
                domain = &email[i+1];
                break;
            }
        }

        if ( domain ) {
            /* XXX - Put code to Verify domain here */

            if ( /* domain is okay */ 1 )
                ckstrncpy(userid,email,len);
        }
    }

    return(userid[0] ? 0 : -1);
    /* END EXAMPLE */
#endif /* X509_SUBJECT_ALT_NAME_TO_USER */
#endif /* X509_UID_TO_USER */
    return -1;
}

/* The following function should be replaced by institution specific */
/* code that will determine whether or not the combination of the    */
/* provided X509 certificate and username is valid for automatic     */
/* login.   Whereas X509_to_user() is used to provide authentication */
/* of the user, the X509_userok() function is used to provide        */
/* authorization.  The certificate passed into X509_userok() does    */
/* need to map to a userid; nor would the userid it would map to     */
/* need to match the userid provided to the function.  There are     */
/* numerous circumstances in which it is beneficial to have the ability */
/* for multiple users to gain access to a common account such as     */
/* 'root' on Unix; or a class account on a web server.  In Unix we   */
/* implement this capability with the ~userid/.tlslogin file which   */
/* a list of X509 certificates which may be used to access the       */
/* account 'userid'.                                                 */

/* X509_to_user() returns 0 if access is denied; 1 is access is permitted */
int
X509_userok(X509 * peer_cert, const char * userid)
{
    /* check if clients cert is in "user"'s ~/.tlslogin file */
    char buf[512];
    int r = 0;
    FILE *fp;
    struct passwd *pwd;
    X509 *file_cert;

    if ( peer_cert == NULL )
        return(0);

    if (!(pwd = getpwnam(userid)))
       return 0;
    if (strlen(pwd->pw_dir) > 500)
       return(0);
    sprintf(buf, "%s/.tlslogin", pwd->pw_dir);

    if (!(fp = fopen(buf, "r")))
        return 0;
    while (!r && (file_cert = PEM_read_X509(fp, NULL, NULL, NULL))) {
        if (!ASN1_STRING_cmp(peer_cert->signature, file_cert->signature))
            r = 1;
        X509_free(file_cert);
    }
    fclose(fp);
    return(r);
}

#endif /* OS2 */
#endif /* CK_SSL */
