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openssl/ssl/s23_clnt.c
Matt Caswell a8b966f48f Run util/openssl-format-source -v -c . 
Reviewed-by: Tim Hudson <tjh@openssl.org>
2015-01-22 09:46:18 +00:00

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/* 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
#ifndef OPENSSL_NO_SSL3
if (ver == SSL3_VERSION)
return (SSLv3_client_method());
#endif
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) */
#ifndef OPENSSL_NO_SSL3
if ((p[2] == SSL3_VERSION_MINOR) && !(s->options & SSL_OP_NO_SSLv3)) {
s->version = SSL3_VERSION;
s->method = SSLv3_client_method();
} else
#endif
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;
}
/* ensure that TLS_MAX_VERSION is up-to-date */
OPENSSL_assert(s->version <= TLS_MAX_VERSION);
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);
}
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