/* ssl/s23_clnt.c */ /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) * All rights reserved. * * This package is an SSL implementation written * by Eric Young (eay@cryptsoft.com). * The implementation was written so as to conform with Netscapes SSL. * * This library is free for commercial and non-commercial use as long as * the following conditions are aheared to. The following conditions * apply to all code found in this distribution, be it the RC4, RSA, * lhash, DES, etc., code; not just the SSL code. The SSL documentation * included with this distribution is covered by the same copyright terms * except that the holder is Tim Hudson (tjh@cryptsoft.com). * * Copyright remains Eric Young's, and as such any Copyright notices in * the code are not to be removed. * If this package is used in a product, Eric Young should be given attribution * as the author of the parts of the library used. * This can be in the form of a textual message at program startup or * in documentation (online or textual) provided with the package. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * "This product includes cryptographic software written by * Eric Young (eay@cryptsoft.com)" * The word 'cryptographic' can be left out if the rouines from the library * being used are not cryptographic related :-). * 4. If you include any Windows specific code (or a derivative thereof) from * the apps directory (application code) you must include an acknowledgement: * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" * * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * The licence and distribution terms for any publically available version or * derivative of this code cannot be changed. i.e. this code cannot simply be * copied and put under another distribution licence * [including the GNU Public Licence.] */ /* ==================================================================== * Copyright (c) 1998-2006 The OpenSSL Project. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * 3. All advertising materials mentioning features or use of this * software must display the following acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit. (http://www.openssl.org/)" * * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to * endorse or promote products derived from this software without * prior written permission. For written permission, please contact * openssl-core@openssl.org. * * 5. Products derived from this software may not be called "OpenSSL" * nor may "OpenSSL" appear in their names without prior written * permission of the OpenSSL Project. * * 6. Redistributions of any form whatsoever must retain the following * acknowledgment: * "This product includes software developed by the OpenSSL Project * for use in the OpenSSL Toolkit (http://www.openssl.org/)" * * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED * OF THE POSSIBILITY OF SUCH DAMAGE. * ==================================================================== * * This product includes cryptographic software written by Eric Young * (eay@cryptsoft.com). This product includes software written by Tim * Hudson (tjh@cryptsoft.com). * */ #include <stdio.h> #include "ssl_locl.h" #include <openssl/buffer.h> #include <openssl/rand.h> #include <openssl/objects.h> #include <openssl/evp.h> static const SSL_METHOD *ssl23_get_client_method(int ver); static int ssl23_client_hello(SSL *s); static int ssl23_get_server_hello(SSL *s); static const SSL_METHOD *ssl23_get_client_method(int ver) { #ifndef OPENSSL_NO_SSL2 if (ver == SSL2_VERSION) return(SSLv2_client_method()); #endif if (ver == SSL3_VERSION) return(SSLv3_client_method()); else if (ver == TLS1_VERSION) return(TLSv1_client_method()); else return(NULL); } IMPLEMENT_ssl23_meth_func(SSLv23_client_method, ssl_undefined_function, ssl23_connect, ssl23_get_client_method) int ssl23_connect(SSL *s) { BUF_MEM *buf=NULL; unsigned long Time=(unsigned long)time(NULL); void (*cb)(const SSL *ssl,int type,int val)=NULL; int ret= -1; int new_state,state; RAND_add(&Time,sizeof(Time),0); ERR_clear_error(); clear_sys_error(); if (s->info_callback != NULL) cb=s->info_callback; else if (s->ctx->info_callback != NULL) cb=s->ctx->info_callback; s->in_handshake++; if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s); for (;;) { state=s->state; switch(s->state) { case SSL_ST_BEFORE: case SSL_ST_CONNECT: case SSL_ST_BEFORE|SSL_ST_CONNECT: case SSL_ST_OK|SSL_ST_CONNECT: if (s->session != NULL) { SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE); ret= -1; goto end; } s->server=0; if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1); /* s->version=TLS1_VERSION; */ s->type=SSL_ST_CONNECT; if (s->init_buf == NULL) { if ((buf=BUF_MEM_new()) == NULL) { ret= -1; goto end; } if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH)) { ret= -1; goto end; } s->init_buf=buf; buf=NULL; } if (!ssl3_setup_buffers(s)) { ret= -1; goto end; } ssl3_init_finished_mac(s); s->state=SSL23_ST_CW_CLNT_HELLO_A; s->ctx->stats.sess_connect++; s->init_num=0; break; case SSL23_ST_CW_CLNT_HELLO_A: case SSL23_ST_CW_CLNT_HELLO_B: s->shutdown=0; ret=ssl23_client_hello(s); if (ret <= 0) goto end; s->state=SSL23_ST_CR_SRVR_HELLO_A; s->init_num=0; break; case SSL23_ST_CR_SRVR_HELLO_A: case SSL23_ST_CR_SRVR_HELLO_B: ret=ssl23_get_server_hello(s); if (ret >= 0) cb=NULL; goto end; /* break; */ default: SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE); ret= -1; goto end; /* break; */ } if (s->debug) { (void)BIO_flush(s->wbio); } if ((cb != NULL) && (s->state != state)) { new_state=s->state; s->state=state; cb(s,SSL_CB_CONNECT_LOOP,1); s->state=new_state; } } end: s->in_handshake--; if (buf != NULL) BUF_MEM_free(buf); if (cb != NULL) cb(s,SSL_CB_CONNECT_EXIT,ret); return(ret); } static int ssl23_no_ssl2_ciphers(SSL *s) { SSL_CIPHER *cipher; STACK_OF(SSL_CIPHER) *ciphers; int i; ciphers = SSL_get_ciphers(s); for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { cipher = sk_SSL_CIPHER_value(ciphers, i); if (cipher->algorithm_ssl == SSL_SSLV2) return 0; } return 1; } static int ssl23_client_hello(SSL *s) { unsigned char *buf; unsigned char *p,*d; int i,ch_len; unsigned long Time,l; int ssl2_compat; int version = 0, version_major, version_minor; #ifndef OPENSSL_NO_COMP int j; SSL_COMP *comp; #endif int ret; ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1; if (ssl2_compat && ssl23_no_ssl2_ciphers(s)) ssl2_compat = 0; if (!(s->options & SSL_OP_NO_TLSv1)) { version = TLS1_VERSION; } else if (!(s->options & SSL_OP_NO_SSLv3)) { version = SSL3_VERSION; } else if (!(s->options & SSL_OP_NO_SSLv2)) { version = SSL2_VERSION; } #ifndef OPENSSL_NO_TLSEXT if (version != SSL2_VERSION) { /* have to disable SSL 2.0 compatibility if we need TLS extensions */ if (s->tlsext_hostname != NULL) ssl2_compat = 0; if (s->tlsext_status_type != -1) ssl2_compat = 0; #ifdef TLSEXT_TYPE_opaque_prf_input if (s->ctx->tlsext_opaque_prf_input_callback != 0 || s->tlsext_opaque_prf_input != NULL) ssl2_compat = 0; #endif } #endif buf=(unsigned char *)s->init_buf->data; if (s->state == SSL23_ST_CW_CLNT_HELLO_A) { #if 0 /* don't reuse session-id's */ if (!ssl_get_new_session(s,0)) { return(-1); } #endif p=s->s3->client_random; Time=(unsigned long)time(NULL); /* Time */ l2n(Time,p); if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0) return -1; if (version == TLS1_VERSION) { version_major = TLS1_VERSION_MAJOR; version_minor = TLS1_VERSION_MINOR; } else if (version == SSL3_VERSION) { version_major = SSL3_VERSION_MAJOR; version_minor = SSL3_VERSION_MINOR; } else if (version == SSL2_VERSION) { version_major = SSL2_VERSION_MAJOR; version_minor = SSL2_VERSION_MINOR; } else { SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE); return(-1); } s->client_version = version; if (ssl2_compat) { /* create SSL 2.0 compatible Client Hello */ /* two byte record header will be written last */ d = &(buf[2]); p = d + 9; /* leave space for message type, version, individual length fields */ *(d++) = SSL2_MT_CLIENT_HELLO; *(d++) = version_major; *(d++) = version_minor; /* Ciphers supported */ i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0); if (i == 0) { /* no ciphers */ SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); return -1; } s2n(i,d); p+=i; /* put in the session-id length (zero since there is no reuse) */ #if 0 s->session->session_id_length=0; #endif s2n(0,d); if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) ch_len=SSL2_CHALLENGE_LENGTH; else ch_len=SSL2_MAX_CHALLENGE_LENGTH; /* write out sslv2 challenge */ /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for futurproofing */ if (SSL3_RANDOM_SIZE < ch_len) i=SSL3_RANDOM_SIZE; else i=ch_len; s2n(i,d); memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE); if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0) return -1; memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); p+=i; i= p- &(buf[2]); buf[0]=((i>>8)&0xff)|0x80; buf[1]=(i&0xff); /* number of bytes to write */ s->init_num=i+2; s->init_off=0; ssl3_finish_mac(s,&(buf[2]),i); } else { /* create Client Hello in SSL 3.0/TLS 1.0 format */ /* do the record header (5 bytes) and handshake message header (4 bytes) last */ d = p = &(buf[9]); *(p++) = version_major; *(p++) = version_minor; /* Random stuff */ memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE); p += SSL3_RANDOM_SIZE; /* Session ID (zero since there is no reuse) */ *(p++) = 0; /* Ciphers supported (using SSL 3.0/TLS 1.0 format) */ i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char); if (i == 0) { SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE); return -1; } s2n(i,p); p+=i; /* COMPRESSION */ #ifdef OPENSSL_NO_COMP *(p++)=1; #else if ((s->options & SSL_OP_NO_COMPRESSION) || !s->ctx->comp_methods) j=0; else j=sk_SSL_COMP_num(s->ctx->comp_methods); *(p++)=1+j; for (i=0; i<j; i++) { comp=sk_SSL_COMP_value(s->ctx->comp_methods,i); *(p++)=comp->id; } #endif *(p++)=0; /* Add the NULL method */ #ifndef OPENSSL_NO_TLSEXT /* TLS extensions*/ if (ssl_prepare_clienthello_tlsext(s) <= 0) { SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT); return -1; } if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL) { SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); return -1; } #endif l = p-d; /* fill in 4-byte handshake header */ d=&(buf[5]); *(d++)=SSL3_MT_CLIENT_HELLO; l2n3(l,d); l += 4; if (l > SSL3_RT_MAX_PLAIN_LENGTH) { SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR); return -1; } /* fill in 5-byte record header */ d=buf; *(d++) = SSL3_RT_HANDSHAKE; *(d++) = version_major; *(d++) = version_minor; /* arguably we should send the *lowest* suported version here * (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */ s2n((int)l,d); /* number of bytes to write */ s->init_num=p-buf; s->init_off=0; ssl3_finish_mac(s,&(buf[5]), s->init_num - 5); } s->state=SSL23_ST_CW_CLNT_HELLO_B; s->init_off=0; } /* SSL3_ST_CW_CLNT_HELLO_B */ ret = ssl23_write_bytes(s); if ((ret >= 2) && s->msg_callback) { /* Client Hello has been sent; tell msg_callback */ if (ssl2_compat) s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg); else s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg); } return ret; } static int ssl23_get_server_hello(SSL *s) { char buf[8]; unsigned char *p; int i; int n; n=ssl23_read_bytes(s,7); if (n != 7) return(n); p=s->packet; memcpy(buf,p,n); if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) && (p[5] == 0x00) && (p[6] == 0x02)) { #ifdef OPENSSL_NO_SSL2 SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); goto err; #else /* we are talking sslv2 */ /* we need to clean up the SSLv3 setup and put in the * sslv2 stuff. */ int ch_len; if (s->options & SSL_OP_NO_SSLv2) { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); goto err; } if (s->s2 == NULL) { if (!ssl2_new(s)) goto err; } else ssl2_clear(s); if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG) ch_len=SSL2_CHALLENGE_LENGTH; else ch_len=SSL2_MAX_CHALLENGE_LENGTH; /* write out sslv2 challenge */ /* Note that ch_len must be <= SSL3_RANDOM_SIZE (32), because it is one of SSL2_MAX_CHALLENGE_LENGTH (32) or SSL2_MAX_CHALLENGE_LENGTH (16), but leave the check in for futurproofing */ i=(SSL3_RANDOM_SIZE < ch_len) ?SSL3_RANDOM_SIZE:ch_len; s->s2->challenge_length=i; memcpy(s->s2->challenge, &(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i); if (s->s3 != NULL) ssl3_free(s); if (!BUF_MEM_grow_clean(s->init_buf, SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)) { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB); goto err; } s->state=SSL2_ST_GET_SERVER_HELLO_A; if (!(s->client_version == SSL2_VERSION)) /* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */ s->s2->ssl2_rollback=1; /* setup the 7 bytes we have read so we get them from * the sslv2 buffer */ s->rstate=SSL_ST_READ_HEADER; s->packet_length=n; s->packet= &(s->s2->rbuf[0]); memcpy(s->packet,buf,n); s->s2->rbuf_left=n; s->s2->rbuf_offs=0; /* we have already written one */ s->s2->write_sequence=1; s->method=SSLv2_client_method(); s->handshake_func=s->method->ssl_connect; #endif } else if (p[1] == SSL3_VERSION_MAJOR && (p[2] == SSL3_VERSION_MINOR || p[2] == TLS1_VERSION_MINOR) && ((p[0] == SSL3_RT_HANDSHAKE && p[5] == SSL3_MT_SERVER_HELLO) || (p[0] == SSL3_RT_ALERT && p[3] == 0 && p[4] == 2))) { /* we have sslv3 or tls1 (server hello or alert) */ if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) { s->version=SSL3_VERSION; s->method=SSLv3_client_method(); } else if ((p[2] == TLS1_VERSION_MINOR) && !(s->options & SSL_OP_NO_TLSv1)) { s->version=TLS1_VERSION; s->method=TLSv1_client_method(); } else { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL); goto err; } if (p[0] == SSL3_RT_ALERT && p[5] != SSL3_AL_WARNING) { /* fatal alert */ void (*cb)(const SSL *ssl,int type,int val)=NULL; int j; if (s->info_callback != NULL) cb=s->info_callback; else if (s->ctx->info_callback != NULL) cb=s->ctx->info_callback; i=p[5]; if (cb != NULL) { j=(i<<8)|p[6]; cb(s,SSL_CB_READ_ALERT,j); } if (s->msg_callback) s->msg_callback(0, s->version, SSL3_RT_ALERT, p+5, 2, s, s->msg_callback_arg); s->rwstate=SSL_NOTHING; SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]); goto err; } if (!ssl_init_wbio_buffer(s,1)) goto err; /* we are in this state */ s->state=SSL3_ST_CR_SRVR_HELLO_A; /* put the 7 bytes we have read into the input buffer * for SSLv3 */ s->rstate=SSL_ST_READ_HEADER; s->packet_length=n; if (s->s3->rbuf.buf == NULL) if (!ssl3_setup_read_buffer(s)) goto err; s->packet= &(s->s3->rbuf.buf[0]); memcpy(s->packet,buf,n); s->s3->rbuf.left=n; s->s3->rbuf.offset=0; s->handshake_func=s->method->ssl_connect; } else { SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNKNOWN_PROTOCOL); goto err; } s->init_num=0; /* Since, if we are sending a ssl23 client hello, we are not * reusing a session-id */ if (!ssl_get_new_session(s,0)) goto err; return(SSL_connect(s)); err: return(-1); }