1: /* ssl/s23_clnt.c */
    2: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
    3:  * All rights reserved.
    4:  *
    5:  * This package is an SSL implementation written
    6:  * by Eric Young (eay@cryptsoft.com).
    7:  * The implementation was written so as to conform with Netscapes SSL.
    8:  * 
    9:  * This library is free for commercial and non-commercial use as long as
   10:  * the following conditions are aheared to.  The following conditions
   11:  * apply to all code found in this distribution, be it the RC4, RSA,
   12:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   13:  * included with this distribution is covered by the same copyright terms
   14:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   15:  * 
   16:  * Copyright remains Eric Young's, and as such any Copyright notices in
   17:  * the code are not to be removed.
   18:  * If this package is used in a product, Eric Young should be given attribution
   19:  * as the author of the parts of the library used.
   20:  * This can be in the form of a textual message at program startup or
   21:  * in documentation (online or textual) provided with the package.
   22:  * 
   23:  * Redistribution and use in source and binary forms, with or without
   24:  * modification, are permitted provided that the following conditions
   25:  * are met:
   26:  * 1. Redistributions of source code must retain the copyright
   27:  *    notice, this list of conditions and the following disclaimer.
   28:  * 2. Redistributions in binary form must reproduce the above copyright
   29:  *    notice, this list of conditions and the following disclaimer in the
   30:  *    documentation and/or other materials provided with the distribution.
   31:  * 3. All advertising materials mentioning features or use of this software
   32:  *    must display the following acknowledgement:
   33:  *    "This product includes cryptographic software written by
   34:  *     Eric Young (eay@cryptsoft.com)"
   35:  *    The word 'cryptographic' can be left out if the rouines from the library
   36:  *    being used are not cryptographic related :-).
   37:  * 4. If you include any Windows specific code (or a derivative thereof) from 
   38:  *    the apps directory (application code) you must include an acknowledgement:
   39:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   40:  * 
   41:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
   42:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   43:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   44:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   45:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   46:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   47:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   48:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   49:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   50:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   51:  * SUCH DAMAGE.
   52:  * 
   53:  * The licence and distribution terms for any publically available version or
   54:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
   55:  * copied and put under another distribution licence
   56:  * [including the GNU Public Licence.]
   57:  */
   58: 
   59: #include <stdio.h>
   60: #include "ssl_locl.h"
   61: #include <openssl/buffer.h>
   62: #include <openssl/rand.h>
   63: #include <openssl/objects.h>
   64: #include <openssl/evp.h>
   65: 
   66: static SSL_METHOD *ssl23_get_client_method(int ver);
   67: static int ssl23_client_hello(SSL *s);
   68: static int ssl23_get_server_hello(SSL *s);
   69: static SSL_METHOD *ssl23_get_client_method(int ver)
   70:         {
   71: #ifndef OPENSSL_NO_SSL2
   72:         if (ver == SSL2_VERSION)
   73:                 return(SSLv2_client_method());
   74: #endif
   75:         if (ver == SSL3_VERSION)
   76:                 return(SSLv3_client_method());
   77:         else if (ver == TLS1_VERSION)
   78:                 return(TLSv1_client_method());
   79:         else
   80:                 return(NULL);
   81:         }
   82: 
   83: IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
   84:                         ssl_undefined_function,
   85:                         ssl23_connect,
   86:                         ssl23_get_client_method)
   87: 
   88: int ssl23_connect(SSL *s)
   89:         {
   90:         BUF_MEM *buf=NULL;
   91:         unsigned long Time=(unsigned long)time(NULL);
   92:         void (*cb)(const SSL *ssl,int type,int val)=NULL;
   93:         int ret= -1;
   94:         int new_state,state;
   95: 
   96:         RAND_add(&Time,sizeof(Time),0);
   97:         ERR_clear_error();
   98:         clear_sys_error();
   99: 
  100:         if (s->info_callback != NULL)
  101:                 cb=s->info_callback;
  102:         else if (s->ctx->info_callback != NULL)
  103:                 cb=s->ctx->info_callback;
  104:         
  105:         s->in_handshake++;
  106:         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); 
  107: 
  108:         for (;;)
  109:                 {
  110:                 state=s->state;
  111: 
  112:                 switch(s->state)
  113:                         {
  114:                 case SSL_ST_BEFORE:
  115:                 case SSL_ST_CONNECT:
  116:                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
  117:                 case SSL_ST_OK|SSL_ST_CONNECT:
  118: 
  119:                         if (s->session != NULL)
  120:                                 {
  121:                                 SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
  122:                                 ret= -1;
  123:                                 goto end;
  124:                                 }
  125:                         s->server=0;
  126:                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
  127: 
  128:                         /* s->version=TLS1_VERSION; */
  129:                         s->type=SSL_ST_CONNECT;
  130: 
  131:                         if (s->init_buf == NULL)
  132:                                 {
  133:                                 if ((buf=BUF_MEM_new()) == NULL)
  134:                                         {
  135:                                         ret= -1;
  136:                                         goto end;
  137:                                         }
  138:                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
  139:                                         {
  140:                                         ret= -1;
  141:                                         goto end;
  142:                                         }
  143:                                 s->init_buf=buf;
  144:                                 buf=NULL;
  145:                                 }
  146: 
  147:                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
  148: 
  149:                         ssl3_init_finished_mac(s);
  150: 
  151:                         s->state=SSL23_ST_CW_CLNT_HELLO_A;
  152:                         s->ctx->stats.sess_connect++;
  153:                         s->init_num=0;
  154:                         break;
  155: 
  156:                 case SSL23_ST_CW_CLNT_HELLO_A:
  157:                 case SSL23_ST_CW_CLNT_HELLO_B:
  158: 
  159:                         s->shutdown=0;
  160:                         ret=ssl23_client_hello(s);
  161:                         if (ret <= 0) goto end;
  162:                         s->state=SSL23_ST_CR_SRVR_HELLO_A;
  163:                         s->init_num=0;
  164: 
  165:                         break;
  166: 
  167:                 case SSL23_ST_CR_SRVR_HELLO_A:
  168:                 case SSL23_ST_CR_SRVR_HELLO_B:
  169:                         ret=ssl23_get_server_hello(s);
  170:                         if (ret >= 0) cb=NULL;
  171:                         goto end;
  172:                         /* break; */
  173: 
  174:                 default:
  175:                         SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
  176:                         ret= -1;
  177:                         goto end;
  178:                         /* break; */
  179:                         }
  180: 
  181:                 if (s->debug) { (void)BIO_flush(s->wbio); }
  182: 
  183:                 if ((cb != NULL) && (s->state != state))
  184:                         {
  185:                         new_state=s->state;
  186:                         s->state=state;
  187:                         cb(s,SSL_CB_CONNECT_LOOP,1);
  188:                         s->state=new_state;
  189:                         }
  190:                 }
  191: end:
  192:         s->in_handshake--;
  193:         if (buf != NULL)
  194:                 BUF_MEM_free(buf);
  195:         if (cb != NULL)
  196:                 cb(s,SSL_CB_CONNECT_EXIT,ret);
  197:         return(ret);
  198:         }
  199: 
  200: 
  201: static int ssl23_client_hello(SSL *s)
  202:         {
  203:         unsigned char *buf;
  204:         unsigned char *p,*d;
  205:         int i,j,ch_len;
  206:         unsigned long Time,l;
  207:         int ssl2_compat;
  208:         int version = 0, version_major, version_minor;
  209:         SSL_COMP *comp;
  210:         int ret;
  211: 
  212:         ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
  213: 
  214:         if (!(s->options & SSL_OP_NO_TLSv1))
  215:                 {
  216:                 version = TLS1_VERSION;
  217:                 }
  218:         else if (!(s->options & SSL_OP_NO_SSLv3))
  219:                 {
  220:                 version = SSL3_VERSION;
  221:                 }
  222:         else if (!(s->options & SSL_OP_NO_SSLv2))
  223:                 {
  224:                 version = SSL2_VERSION;
  225:                 }
  226: #ifndef OPENSSL_NO_TLSEXT 
  227:         if (version != SSL2_VERSION)
  228:                 {
  229:                 /* have to disable SSL 2.0 compatibility if we need TLS extensions */
  230: 
  231:                 if (s->tlsext_hostname != NULL)
  232:                         ssl2_compat = 0;
  233:                 }
  234: #endif
  235: 
  236:         buf=(unsigned char *)s->init_buf->data;
  237:         if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
  238:                 {
  239: #if 0
  240:                 /* don't reuse session-id's */
  241:                 if (!ssl_get_new_session(s,0))
  242:                         {
  243:                         return(-1);
  244:                         }
  245: #endif
  246: 
  247:                 p=s->s3->client_random;
  248:                 Time=(unsigned long)time(NULL);               /* Time */
  249:                 l2n(Time,p);
  250:                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
  251:                         return -1;
  252: 
  253:                 if (version == TLS1_VERSION)
  254:                         {
  255:                         version_major = TLS1_VERSION_MAJOR;
  256:                         version_minor = TLS1_VERSION_MINOR;
  257:                         }
  258:                 else if (version == SSL3_VERSION)
  259:                         {
  260:                         version_major = SSL3_VERSION_MAJOR;
  261:                         version_minor = SSL3_VERSION_MINOR;
  262:                         }
  263:                 else if (version == SSL2_VERSION)
  264:                         {
  265:                         version_major = SSL2_VERSION_MAJOR;
  266:                         version_minor = SSL2_VERSION_MINOR;
  267:                         }
  268:                 else
  269:                         {
  270:                         SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
  271:                         return(-1);
  272:                         }
  273: 
  274:                 s->client_version = version;
  275: 
  276:                 if (ssl2_compat)
  277:                         {
  278:                         /* create SSL 2.0 compatible Client Hello */
  279: 
  280:                         /* two byte record header will be written last */
  281:                         d = &(buf[2]);
  282:                         p = d + 9; /* leave space for message type, version, individual length fields */
  283: 
  284:                         *(d++) = SSL2_MT_CLIENT_HELLO;
  285:                         *(d++) = version_major;
  286:                         *(d++) = version_minor;
  287:                         
  288:                         /* Ciphers supported */
  289:                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
  290:                         if (i == 0)
  291:                                 {
  292:                                 /* no ciphers */
  293:                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
  294:                                 return -1;
  295:                                 }
  296:                         s2n(i,d);
  297:                         p+=i;
  298:                         
  299:                         /* put in the session-id length (zero since there is no reuse) */
  300: #if 0
  301:                         s->session->session_id_length=0;
  302: #endif
  303:                         s2n(0,d);
  304: 
  305:                         if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
  306:                                 ch_len=SSL2_CHALLENGE_LENGTH;
  307:                         else
  308:                                 ch_len=SSL2_MAX_CHALLENGE_LENGTH;
  309: 
  310:                         /* write out sslv2 challenge */
  311:                         if (SSL3_RANDOM_SIZE < ch_len)
  312:                                 i=SSL3_RANDOM_SIZE;
  313:                         else
  314:                                 i=ch_len;
  315:                         s2n(i,d);
  316:                         memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
  317:                         if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
  318:                                 return -1;
  319: 
  320:                         memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
  321:                         p+=i;
  322: 
  323:                         i= p- &(buf[2]);
  324:                         buf[0]=((i>>8)&0xff)|0x80;
  325:                         buf[1]=(i&0xff);
  326: 
  327:                         /* number of bytes to write */
  328:                         s->init_num=i+2;
  329:                         s->init_off=0;
  330: 
  331:                         ssl3_finish_mac(s,&(buf[2]),i);
  332:                         }
  333:                 else
  334:                         {
  335:                         /* create Client Hello in SSL 3.0/TLS 1.0 format */
  336: 
  337:                         /* do the record header (5 bytes) and handshake message header (4 bytes) last */
  338:                         d = p = &(buf[9]);
  339:                         
  340:                         *(p++) = version_major;
  341:                         *(p++) = version_minor;
  342: 
  343:                         /* Random stuff */
  344:                         memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
  345:                         p += SSL3_RANDOM_SIZE;
  346: 
  347:                         /* Session ID (zero since there is no reuse) */
  348:                         *(p++) = 0;
  349: 
  350:                         /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
  351:                         i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
  352:                         if (i == 0)
  353:                                 {
  354:                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
  355:                                 return -1;
  356:                                 }
  357:                         s2n(i,p);
  358:                         p+=i;
  359: 
  360:                         /* COMPRESSION */
  361:                         if (s->ctx->comp_methods == NULL)
  362:                                 j=0;
  363:                         else
  364:                                 j=sk_SSL_COMP_num(s->ctx->comp_methods);
  365:                         *(p++)=1+j;
  366:                         for (i=0; i<j; i++)
  367:                                 {
  368:                                 comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
  369:                                 *(p++)=comp->id;
  370:                                 }
  371:                         *(p++)=0; /* Add the NULL method */
  372: #ifndef OPENSSL_NO_TLSEXT
  373:                         if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
  374:                                 {
  375:                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
  376:                                 return -1;
  377:                                 }
  378: #endif
  379:                         
  380:                         l = p-d;
  381:                         *p = 42;
  382: 
  383:                         /* fill in 4-byte handshake header */
  384:                         d=&(buf[5]);
  385:                         *(d++)=SSL3_MT_CLIENT_HELLO;
  386:                         l2n3(l,d);
  387: 
  388:                         l += 4;
  389: 
  390:                         if (l > SSL3_RT_MAX_PLAIN_LENGTH)
  391:                                 {
  392:                                 SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
  393:                                 return -1;
  394:                                 }
  395:                         
  396:                         /* fill in 5-byte record header */
  397:                         d=buf;
  398:                         *(d++) = SSL3_RT_HANDSHAKE;
  399:                         *(d++) = version_major;
  400:                         *(d++) = version_minor; /* arguably we should send the *lowest* suported version here
  401:                                                  * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
  402:                         s2n((int)l,d);
  403: 
  404:                         /* number of bytes to write */
  405:                         s->init_num=p-buf;
  406:                         s->init_off=0;
  407: 
  408:                         ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
  409:                         }
  410: 
  411:                 s->state=SSL23_ST_CW_CLNT_HELLO_B;
  412:                 s->init_off=0;
  413:                 }
  414: 
  415:         /* SSL3_ST_CW_CLNT_HELLO_B */
  416:         ret = ssl23_write_bytes(s);
  417: 
  418:         if ((ret >= 2) && s->msg_callback)
  419:                 {
  420:                 /* Client Hello has been sent; tell msg_callback */
  421: 
  422:                 if (ssl2_compat)
  423:                         s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
  424:                 else
  425:                         s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
  426:                 }
  427: 
  428:         return ret;
  429:         }
  430: 
  431: static int ssl23_get_server_hello(SSL *s)
  432:         {
  433:         char buf[8];
  434:         unsigned char *p;
  435:         int i;
  436:         int n;
  437: 
  438:         n=ssl23_read_bytes(s,7);
  439: 
  440:         if (n != 7) return(n);
  441:         p=s->packet;
  442: 
  443:         memcpy(buf,p,n);
  444: 
  445:         if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
  446:                 (p[5] == 0x00) && (p[6] == 0x02))
  447:                 {
  448: #ifdef OPENSSL_NO_SSL2
  449:                 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
  450:                 goto err;
  451: #else
  452:                 /* we are talking sslv2 */
  453:                 /* we need to clean up the SSLv3 setup and put in the
  454:                  * sslv2 stuff. */
  455:                 int ch_len;
  456: 
  457:                 if (s->options & SSL_OP_NO_SSLv2)
  458:                         {
  459:                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
  460:                         goto err;
  461:                         }
  462:                 if (s->s2 == NULL)
  463:                         {
  464:                         if (!ssl2_new(s))
  465:                                 goto err;
  466:                         }
  467:                 else
  468:                         ssl2_clear(s);
  469: 
  470:                 if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
  471:                         ch_len=SSL2_CHALLENGE_LENGTH;
  472:                 else
  473:                         ch_len=SSL2_MAX_CHALLENGE_LENGTH;
  474: 
  475:                 /* write out sslv2 challenge */
  476:                 i=(SSL3_RANDOM_SIZE < ch_len)
  477:                         ?SSL3_RANDOM_SIZE:ch_len;
  478:                 s->s2->challenge_length=i;
  479:                 memcpy(s->s2->challenge,
  480:                         &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
  481: 
  482:                 if (s->s3 != NULL) ssl3_free(s);
  483: 
  484:                 if (!BUF_MEM_grow_clean(s->init_buf,
  485:                         SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
  486:                         {
  487:                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
  488:                         goto err;
  489:                         }
  490: 
  491:                 s->state=SSL2_ST_GET_SERVER_HELLO_A;
  492:                 if (!(s->client_version == SSL2_VERSION))
  493:                         /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
  494:                         s->s2->ssl2_rollback=1;
  495: 
  496:                 /* setup the 5 bytes we have read so we get them from
  497:                  * the sslv2 buffer */
  498:                 s->rstate=SSL_ST_READ_HEADER;
  499:                 s->packet_length=n;
  500:                 s->packet= &(s->s2->rbuf[0]);
  501:                 memcpy(s->packet,buf,n);
  502:                 s->s2->rbuf_left=n;
  503:                 s->s2->rbuf_offs=0;
  504: 
  505:                 /* we have already written one */
  506:                 s->s2->write_sequence=1;
  507: 
  508:                 s->method=SSLv2_client_method();
  509:                 s->handshake_func=s->method->ssl_connect;
  510: #endif
  511:                 }
  512:         else if ((p[0] == SSL3_RT_HANDSHAKE) &&
  513:                  (p[1] == SSL3_VERSION_MAJOR) &&
  514:                  ((p[2] == SSL3_VERSION_MINOR) ||
  515:                   (p[2] == TLS1_VERSION_MINOR)) &&
  516:                  (p[5] == SSL3_MT_SERVER_HELLO))
  517:                 {
  518:                 /* we have sslv3 or tls1 */
  519: 
  520:                 if (!ssl_init_wbio_buffer(s,1)) goto err;
  521: 
  522:                 /* we are in this state */
  523:                 s->state=SSL3_ST_CR_SRVR_HELLO_A;
  524: 
  525:                 /* put the 5 bytes we have read into the input buffer
  526:                  * for SSLv3 */
  527:                 s->rstate=SSL_ST_READ_HEADER;
  528:                 s->packet_length=n;
  529:                 s->packet= &(s->s3->rbuf.buf[0]);
  530:                 memcpy(s->packet,buf,n);
  531:                 s->s3->rbuf.left=n;
  532:                 s->s3->rbuf.offset=0;
  533: 
  534:                 if ((p[2] == SSL3_VERSION_MINOR) &&
  535:                         !(s->options & SSL_OP_NO_SSLv3))
  536:                         {
  537:                         s->version=SSL3_VERSION;
  538:                         s->method=SSLv3_client_method();
  539:                         }
  540:                 else if ((p[2] == TLS1_VERSION_MINOR) &&
  541:                         !(s->options & SSL_OP_NO_TLSv1))
  542:                         {
  543:                         s->version=TLS1_VERSION;
  544:                         s->method=TLSv1_client_method();
  545:                         }
  546:                 else
  547:                         {
  548:                         SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
  549:                         goto err;
  550:                         }
  551:                         
  552:                 s->handshake_func=s->method->ssl_connect;
  553:                 }
  554:         else if ((p[0] == SSL3_RT_ALERT) &&
  555:                  (p[1] == SSL3_VERSION_MAJOR) &&
  556:                  ((p[2] == SSL3_VERSION_MINOR) ||
  557:                   (p[2] == TLS1_VERSION_MINOR)) &&
  558:                  (p[3] == 0) &&