622 lines
15 KiB
C
622 lines
15 KiB
C
/* ssl/s23_clnt.c */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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* All rights reserved.
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*
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* This package is an SSL implementation written
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* by Eric Young (eay@cryptsoft.com).
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* The implementation was written so as to conform with Netscapes SSL.
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*
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* This library is free for commercial and non-commercial use as long as
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* the following conditions are aheared to. The following conditions
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* apply to all code found in this distribution, be it the RC4, RSA,
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation
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* included with this distribution is covered by the same copyright terms
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* except that the holder is Tim Hudson (tjh@cryptsoft.com).
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*
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* Copyright remains Eric Young's, and as such any Copyright notices in
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* the code are not to be removed.
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* If this package is used in a product, Eric Young should be given attribution
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* as the author of the parts of the library used.
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* This can be in the form of a textual message at program startup or
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* in documentation (online or textual) provided with the package.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* "This product includes cryptographic software written by
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* Eric Young (eay@cryptsoft.com)"
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* The word 'cryptographic' can be left out if the rouines from the library
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* being used are not cryptographic related :-).
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* 4. If you include any Windows specific code (or a derivative thereof) from
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* the apps directory (application code) you must include an acknowledgement:
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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*
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* The licence and distribution terms for any publically available version or
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* derivative of this code cannot be changed. i.e. this code cannot simply be
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* copied and put under another distribution licence
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* [including the GNU Public Licence.]
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*/
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#include <stdio.h>
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#include "ssl_locl.h"
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#include <openssl/buffer.h>
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#include <openssl/rand.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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static SSL_METHOD *ssl23_get_client_method(int ver);
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static int ssl23_client_hello(SSL *s);
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static int ssl23_get_server_hello(SSL *s);
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static SSL_METHOD *ssl23_get_client_method(int ver)
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{
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#ifndef OPENSSL_NO_SSL2
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if (ver == SSL2_VERSION)
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return(SSLv2_client_method());
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#endif
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if (ver == SSL3_VERSION)
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return(SSLv3_client_method());
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else if (ver == TLS1_VERSION)
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return(TLSv1_client_method());
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else
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return(NULL);
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}
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IMPLEMENT_ssl23_meth_func(SSLv23_client_method,
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ssl_undefined_function,
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ssl23_connect,
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ssl23_get_client_method)
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int ssl23_connect(SSL *s)
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{
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BUF_MEM *buf=NULL;
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unsigned long Time=(unsigned long)time(NULL);
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void (*cb)(const SSL *ssl,int type,int val)=NULL;
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int ret= -1;
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int new_state,state;
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RAND_add(&Time,sizeof(Time),0);
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ERR_clear_error();
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clear_sys_error();
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if (s->info_callback != NULL)
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cb=s->info_callback;
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else if (s->ctx->info_callback != NULL)
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cb=s->ctx->info_callback;
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s->in_handshake++;
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if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
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for (;;)
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{
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state=s->state;
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switch(s->state)
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{
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case SSL_ST_BEFORE:
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case SSL_ST_CONNECT:
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case SSL_ST_BEFORE|SSL_ST_CONNECT:
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case SSL_ST_OK|SSL_ST_CONNECT:
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if (s->session != NULL)
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{
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SSLerr(SSL_F_SSL23_CONNECT,SSL_R_SSL23_DOING_SESSION_ID_REUSE);
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ret= -1;
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goto end;
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}
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s->server=0;
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if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
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/* s->version=TLS1_VERSION; */
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s->type=SSL_ST_CONNECT;
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if (s->init_buf == NULL)
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{
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if ((buf=BUF_MEM_new()) == NULL)
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{
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ret= -1;
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goto end;
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}
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if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
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{
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ret= -1;
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goto end;
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}
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s->init_buf=buf;
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buf=NULL;
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}
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if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
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ssl3_init_finished_mac(s);
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s->state=SSL23_ST_CW_CLNT_HELLO_A;
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s->ctx->stats.sess_connect++;
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s->init_num=0;
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break;
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case SSL23_ST_CW_CLNT_HELLO_A:
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case SSL23_ST_CW_CLNT_HELLO_B:
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s->shutdown=0;
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ret=ssl23_client_hello(s);
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if (ret <= 0) goto end;
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s->state=SSL23_ST_CR_SRVR_HELLO_A;
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s->init_num=0;
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break;
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case SSL23_ST_CR_SRVR_HELLO_A:
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case SSL23_ST_CR_SRVR_HELLO_B:
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ret=ssl23_get_server_hello(s);
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if (ret >= 0) cb=NULL;
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goto end;
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/* break; */
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default:
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SSLerr(SSL_F_SSL23_CONNECT,SSL_R_UNKNOWN_STATE);
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ret= -1;
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goto end;
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/* break; */
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}
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if (s->debug) { (void)BIO_flush(s->wbio); }
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if ((cb != NULL) && (s->state != state))
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{
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new_state=s->state;
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s->state=state;
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cb(s,SSL_CB_CONNECT_LOOP,1);
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s->state=new_state;
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}
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}
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end:
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s->in_handshake--;
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if (buf != NULL)
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BUF_MEM_free(buf);
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if (cb != NULL)
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cb(s,SSL_CB_CONNECT_EXIT,ret);
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return(ret);
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}
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static int ssl23_client_hello(SSL *s)
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{
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unsigned char *buf;
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unsigned char *p,*d;
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int i,ch_len;
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unsigned long Time,l;
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int ssl2_compat;
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int version = 0, version_major, version_minor;
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#ifndef OPENSSL_NO_COMP
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int j;
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SSL_COMP *comp;
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#endif
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int ret;
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ssl2_compat = (s->options & SSL_OP_NO_SSLv2) ? 0 : 1;
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if (!(s->options & SSL_OP_NO_TLSv1))
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{
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version = TLS1_VERSION;
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}
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else if (!(s->options & SSL_OP_NO_SSLv3))
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{
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version = SSL3_VERSION;
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}
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else if (!(s->options & SSL_OP_NO_SSLv2))
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{
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version = SSL2_VERSION;
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}
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#ifndef OPENSSL_NO_TLSEXT
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if (version != SSL2_VERSION)
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{
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/* have to disable SSL 2.0 compatibility if we need TLS extensions */
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if (s->tlsext_hostname != NULL)
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ssl2_compat = 0;
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if (s->tlsext_status_type != -1)
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ssl2_compat = 0;
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}
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#endif
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buf=(unsigned char *)s->init_buf->data;
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if (s->state == SSL23_ST_CW_CLNT_HELLO_A)
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{
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#if 0
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/* don't reuse session-id's */
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if (!ssl_get_new_session(s,0))
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{
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return(-1);
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}
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#endif
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p=s->s3->client_random;
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Time=(unsigned long)time(NULL); /* Time */
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l2n(Time,p);
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if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
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return -1;
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if (version == TLS1_VERSION)
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{
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version_major = TLS1_VERSION_MAJOR;
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version_minor = TLS1_VERSION_MINOR;
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}
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#ifdef OPENSSL_FIPS
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else if(FIPS_mode())
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{
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SSLerr(SSL_F_SSL23_CLIENT_HELLO,
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SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
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return -1;
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}
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#endif
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else if (version == SSL3_VERSION)
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{
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version_major = SSL3_VERSION_MAJOR;
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version_minor = SSL3_VERSION_MINOR;
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}
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else if (version == SSL2_VERSION)
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{
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version_major = SSL2_VERSION_MAJOR;
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version_minor = SSL2_VERSION_MINOR;
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}
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else
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{
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SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_PROTOCOLS_AVAILABLE);
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return(-1);
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}
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s->client_version = version;
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if (ssl2_compat)
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{
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/* create SSL 2.0 compatible Client Hello */
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/* two byte record header will be written last */
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d = &(buf[2]);
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p = d + 9; /* leave space for message type, version, individual length fields */
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*(d++) = SSL2_MT_CLIENT_HELLO;
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*(d++) = version_major;
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*(d++) = version_minor;
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/* Ciphers supported */
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i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),p,0);
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if (i == 0)
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{
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/* no ciphers */
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SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
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return -1;
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}
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s2n(i,d);
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p+=i;
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/* put in the session-id length (zero since there is no reuse) */
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#if 0
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s->session->session_id_length=0;
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#endif
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s2n(0,d);
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if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
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ch_len=SSL2_CHALLENGE_LENGTH;
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else
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ch_len=SSL2_MAX_CHALLENGE_LENGTH;
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/* write out sslv2 challenge */
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if (SSL3_RANDOM_SIZE < ch_len)
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i=SSL3_RANDOM_SIZE;
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else
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i=ch_len;
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s2n(i,d);
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memset(&(s->s3->client_random[0]),0,SSL3_RANDOM_SIZE);
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if (RAND_pseudo_bytes(&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i) <= 0)
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return -1;
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memcpy(p,&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
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p+=i;
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i= p- &(buf[2]);
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buf[0]=((i>>8)&0xff)|0x80;
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buf[1]=(i&0xff);
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/* number of bytes to write */
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s->init_num=i+2;
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s->init_off=0;
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ssl3_finish_mac(s,&(buf[2]),i);
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}
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else
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{
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/* create Client Hello in SSL 3.0/TLS 1.0 format */
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/* do the record header (5 bytes) and handshake message header (4 bytes) last */
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d = p = &(buf[9]);
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*(p++) = version_major;
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*(p++) = version_minor;
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/* Random stuff */
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memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
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p += SSL3_RANDOM_SIZE;
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/* Session ID (zero since there is no reuse) */
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*(p++) = 0;
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/* Ciphers supported (using SSL 3.0/TLS 1.0 format) */
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i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),ssl3_put_cipher_by_char);
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if (i == 0)
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{
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SSLerr(SSL_F_SSL23_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
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return -1;
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}
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s2n(i,p);
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p+=i;
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#ifdef OPENSSL_NO_COMP
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*(p++)=1;
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#else
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/* COMPRESSION */
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if (s->ctx->comp_methods == NULL)
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j=0;
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else
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j=sk_SSL_COMP_num(s->ctx->comp_methods);
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*(p++)=1+j;
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for (i=0; i<j; i++)
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{
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comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
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*(p++)=comp->id;
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}
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#endif
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*(p++)=0; /* Add the NULL method */
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#ifndef OPENSSL_NO_TLSEXT
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if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
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{
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SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
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return -1;
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}
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#endif
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l = p-d;
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*p = 42;
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/* fill in 4-byte handshake header */
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d=&(buf[5]);
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*(d++)=SSL3_MT_CLIENT_HELLO;
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l2n3(l,d);
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l += 4;
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if (l > SSL3_RT_MAX_PLAIN_LENGTH)
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{
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SSLerr(SSL_F_SSL23_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
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return -1;
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}
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/* fill in 5-byte record header */
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d=buf;
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*(d++) = SSL3_RT_HANDSHAKE;
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*(d++) = version_major;
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*(d++) = version_minor; /* arguably we should send the *lowest* suported version here
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* (indicating, e.g., TLS 1.0 in "SSL 3.0 format") */
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s2n((int)l,d);
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/* number of bytes to write */
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s->init_num=p-buf;
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s->init_off=0;
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ssl3_finish_mac(s,&(buf[5]), s->init_num - 5);
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}
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s->state=SSL23_ST_CW_CLNT_HELLO_B;
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s->init_off=0;
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}
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/* SSL3_ST_CW_CLNT_HELLO_B */
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ret = ssl23_write_bytes(s);
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if ((ret >= 2) && s->msg_callback)
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{
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/* Client Hello has been sent; tell msg_callback */
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if (ssl2_compat)
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s->msg_callback(1, SSL2_VERSION, 0, s->init_buf->data+2, ret-2, s, s->msg_callback_arg);
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else
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s->msg_callback(1, version, SSL3_RT_HANDSHAKE, s->init_buf->data+5, ret-5, s, s->msg_callback_arg);
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}
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return ret;
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}
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static int ssl23_get_server_hello(SSL *s)
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{
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char buf[8];
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unsigned char *p;
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int i;
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int n;
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n=ssl23_read_bytes(s,7);
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if (n != 7) return(n);
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p=s->packet;
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memcpy(buf,p,n);
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if ((p[0] & 0x80) && (p[2] == SSL2_MT_SERVER_HELLO) &&
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(p[5] == 0x00) && (p[6] == 0x02))
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{
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#ifdef OPENSSL_NO_SSL2
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SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
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goto err;
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#else
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/* we are talking sslv2 */
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/* we need to clean up the SSLv3 setup and put in the
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* sslv2 stuff. */
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int ch_len;
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if (s->options & SSL_OP_NO_SSLv2)
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{
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SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_PROTOCOL);
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goto err;
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}
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if (s->s2 == NULL)
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{
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if (!ssl2_new(s))
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goto err;
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}
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else
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ssl2_clear(s);
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if (s->options & SSL_OP_NETSCAPE_CHALLENGE_BUG)
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ch_len=SSL2_CHALLENGE_LENGTH;
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else
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ch_len=SSL2_MAX_CHALLENGE_LENGTH;
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/* write out sslv2 challenge */
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i=(SSL3_RANDOM_SIZE < ch_len)
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?SSL3_RANDOM_SIZE:ch_len;
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s->s2->challenge_length=i;
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memcpy(s->s2->challenge,
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&(s->s3->client_random[SSL3_RANDOM_SIZE-i]),i);
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if (s->s3 != NULL) ssl3_free(s);
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if (!BUF_MEM_grow_clean(s->init_buf,
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SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
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{
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SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,ERR_R_BUF_LIB);
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goto err;
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}
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s->state=SSL2_ST_GET_SERVER_HELLO_A;
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if (!(s->client_version == SSL2_VERSION))
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/* use special padding (SSL 3.0 draft/RFC 2246, App. E.2) */
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|
s->s2->ssl2_rollback=1;
|
|
|
|
/* setup the 5 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[0] == SSL3_RT_HANDSHAKE) &&
|
|
(p[1] == SSL3_VERSION_MAJOR) &&
|
|
((p[2] == SSL3_VERSION_MINOR) ||
|
|
(p[2] == TLS1_VERSION_MINOR)) &&
|
|
(p[5] == SSL3_MT_SERVER_HELLO))
|
|
{
|
|
/* we have sslv3 or tls1 */
|
|
|
|
if (!ssl_init_wbio_buffer(s,1)) goto err;
|
|
|
|
/* we are in this state */
|
|
s->state=SSL3_ST_CR_SRVR_HELLO_A;
|
|
|
|
/* put the 5 bytes we have read into the input buffer
|
|
* for SSLv3 */
|
|
s->rstate=SSL_ST_READ_HEADER;
|
|
s->packet_length=n;
|
|
s->packet= &(s->s3->rbuf.buf[0]);
|
|
memcpy(s->packet,buf,n);
|
|
s->s3->rbuf.left=n;
|
|
s->s3->rbuf.offset=0;
|
|
|
|
if ((p[2] == SSL3_VERSION_MINOR) &&
|
|
!(s->options & SSL_OP_NO_SSLv3))
|
|
{
|
|
#ifdef OPENSSL_FIPS
|
|
if(FIPS_mode())
|
|
{
|
|
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,
|
|
SSL_R_ONLY_TLS_ALLOWED_IN_FIPS_MODE);
|
|
goto err;
|
|
}
|
|
#endif
|
|
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;
|
|
}
|
|
|
|
s->handshake_func=s->method->ssl_connect;
|
|
}
|
|
else if ((p[0] == SSL3_RT_ALERT) &&
|
|
(p[1] == SSL3_VERSION_MAJOR) &&
|
|
((p[2] == SSL3_VERSION_MINOR) ||
|
|
(p[2] == TLS1_VERSION_MINOR)) &&
|
|
(p[3] == 0) &&
|
|
(p[4] == 2))
|
|
{
|
|
void (*cb)(const SSL *ssl,int type,int val)=NULL;
|
|
int j;
|
|
|
|
/* An alert */
|
|
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);
|
|
}
|
|
|
|
s->rwstate=SSL_NOTHING;
|
|
SSLerr(SSL_F_SSL23_GET_SERVER_HELLO,SSL_AD_REASON_OFFSET+p[6]);
|
|
goto err;
|
|
}
|
|
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);
|
|
}
|
|
|