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openssl/ssl/s2_clnt.c
Ben Laurie 2708813166 Add and use a constant-time memcmp. 
This change adds CRYPTO_memcmp, which compares two vectors of bytes in
an amount of time that's independent of their contents. It also changes
several MAC compares in the code to use this over the standard memcmp,
which may leak information about the size of a matching prefix.
(cherry picked from commit 2ee798880a)

Conflicts:
	crypto/crypto.h
	ssl/t1_lib.c
(cherry picked from commit dc406b59f3169fe191e58906df08dce97edb727c)

Conflicts:
	crypto/crypto.h
	ssl/d1_pkt.c
	ssl/s3_pkt.c
2013-02-05 16:50:32 +00:00

1123 lines
30 KiB
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/* ssl/s2_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) 1998-2001 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 "ssl_locl.h"
#ifndef OPENSSL_NO_SSL2
#include <stdio.h>
#include <openssl/rand.h>
#include <openssl/buffer.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
static SSL_METHOD *ssl2_get_client_method(int ver);
static int get_server_finished(SSL *s);
static int get_server_verify(SSL *s);
static int get_server_hello(SSL *s);
static int client_hello(SSL *s);
static int client_master_key(SSL *s);
static int client_finished(SSL *s);
static int client_certificate(SSL *s);
static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
unsigned char *to,int padding);
#define BREAK break
static SSL_METHOD *ssl2_get_client_method(int ver)
{
if (ver == SSL2_VERSION)
return(SSLv2_client_method());
else
return(NULL);
}
IMPLEMENT_ssl2_meth_func(SSLv2_client_method,
ssl_undefined_function,
ssl2_connect,
ssl2_get_client_method)
int ssl2_connect(SSL *s)
{
unsigned long l=(unsigned long)time(NULL);
BUF_MEM *buf=NULL;
int ret= -1;
void (*cb)(const SSL *ssl,int type,int val)=NULL;
int new_state,state;
RAND_add(&l,sizeof(l),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;
/* init things to blank */
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:
s->server=0;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
s->version=SSL2_VERSION;
s->type=SSL_ST_CONNECT;
buf=s->init_buf;
if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
{
ret= -1;
goto end;
}
if (!BUF_MEM_grow(buf,
SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
{
if (buf == s->init_buf)
buf=NULL;
ret= -1;
goto end;
}
s->init_buf=buf;
buf=NULL;
s->init_num=0;
s->state=SSL2_ST_SEND_CLIENT_HELLO_A;
s->ctx->stats.sess_connect++;
s->handshake_func=ssl2_connect;
BREAK;
case SSL2_ST_SEND_CLIENT_HELLO_A:
case SSL2_ST_SEND_CLIENT_HELLO_B:
s->shutdown=0;
ret=client_hello(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_GET_SERVER_HELLO_A;
BREAK;
case SSL2_ST_GET_SERVER_HELLO_A:
case SSL2_ST_GET_SERVER_HELLO_B:
ret=get_server_hello(s);
if (ret <= 0) goto end;
s->init_num=0;
if (!s->hit) /* new session */
{
s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_A;
BREAK;
}
else
{
s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
break;
}
case SSL2_ST_SEND_CLIENT_MASTER_KEY_A:
case SSL2_ST_SEND_CLIENT_MASTER_KEY_B:
ret=client_master_key(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_CLIENT_START_ENCRYPTION;
break;
case SSL2_ST_CLIENT_START_ENCRYPTION:
/* Ok, we now have all the stuff needed to
* start encrypting, so lets fire it up :-) */
if (!ssl2_enc_init(s,1))
{
ret= -1;
goto end;
}
s->s2->clear_text=0;
s->state=SSL2_ST_SEND_CLIENT_FINISHED_A;
break;
case SSL2_ST_SEND_CLIENT_FINISHED_A:
case SSL2_ST_SEND_CLIENT_FINISHED_B:
ret=client_finished(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_GET_SERVER_VERIFY_A;
break;
case SSL2_ST_GET_SERVER_VERIFY_A:
case SSL2_ST_GET_SERVER_VERIFY_B:
ret=get_server_verify(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_GET_SERVER_FINISHED_A;
break;
case SSL2_ST_GET_SERVER_FINISHED_A:
case SSL2_ST_GET_SERVER_FINISHED_B:
ret=get_server_finished(s);
if (ret <= 0) goto end;
break;
case SSL2_ST_SEND_CLIENT_CERTIFICATE_A:
case SSL2_ST_SEND_CLIENT_CERTIFICATE_B:
case SSL2_ST_SEND_CLIENT_CERTIFICATE_C:
case SSL2_ST_SEND_CLIENT_CERTIFICATE_D:
case SSL2_ST_X509_GET_CLIENT_CERTIFICATE:
ret=client_certificate(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_GET_SERVER_FINISHED_A;
break;
case SSL_ST_OK:
if (s->init_buf != NULL)
{
BUF_MEM_free(s->init_buf);
s->init_buf=NULL;
}
s->init_num=0;
/* ERR_clear_error();*/
/* If we want to cache session-ids in the client
* and we successfully add the session-id to the
* cache, and there is a callback, then pass it out.
* 26/11/96 - eay - only add if not a re-used session.
*/
ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
if (s->hit) s->ctx->stats.sess_hit++;
ret=1;
/* s->server=0; */
s->ctx->stats.sess_connect_good++;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
goto end;
/* break; */
default:
SSLerr(SSL_F_SSL2_CONNECT,SSL_R_UNKNOWN_STATE);
return(-1);
/* break; */
}
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 get_server_hello(SSL *s)
{
unsigned char *buf;
unsigned char *p;
int i,j;
unsigned long len;
STACK_OF(SSL_CIPHER) *sk=NULL,*cl, *prio, *allow;
buf=(unsigned char *)s->init_buf->data;
p=buf;
if (s->state == SSL2_ST_GET_SERVER_HELLO_A)
{
i=ssl2_read(s,(char *)&(buf[s->init_num]),11-s->init_num);
if (i < (11-s->init_num))
return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
s->init_num = 11;
if (*(p++) != SSL2_MT_SERVER_HELLO)
{
if (p[-1] != SSL2_MT_ERROR)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_HELLO,
SSL_R_READ_WRONG_PACKET_TYPE);
}
else
SSLerr(SSL_F_GET_SERVER_HELLO,
SSL_R_PEER_ERROR);
return(-1);
}
#ifdef __APPLE_CC__
/* The Rhapsody 5.5 (a.k.a. MacOS X) compiler bug
* workaround. <appro@fy.chalmers.se> */
s->hit=(i=*(p++))?1:0;
#else
s->hit=(*(p++))?1:0;
#endif
s->s2->tmp.cert_type= *(p++);
n2s(p,i);
if (i < s->version) s->version=i;
n2s(p,i); s->s2->tmp.cert_length=i;
n2s(p,i); s->s2->tmp.csl=i;
n2s(p,i); s->s2->tmp.conn_id_length=i;
s->state=SSL2_ST_GET_SERVER_HELLO_B;
}
/* SSL2_ST_GET_SERVER_HELLO_B */
len = 11 + (unsigned long)s->s2->tmp.cert_length + (unsigned long)s->s2->tmp.csl + (unsigned long)s->s2->tmp.conn_id_length;
if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
{
SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_MESSAGE_TOO_LONG);
return -1;
}
j = (int)len - s->init_num;
i = ssl2_read(s,(char *)&(buf[s->init_num]),j);
if (i != j) return(ssl2_part_read(s,SSL_F_GET_SERVER_HELLO,i));
if (s->msg_callback)
s->msg_callback(0, s->version, 0, buf, (size_t)len, s, s->msg_callback_arg); /* SERVER-HELLO */
/* things are looking good */
p = buf + 11;
if (s->hit)
{
if (s->s2->tmp.cert_length != 0)
{
SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_LENGTH_NOT_ZERO);
return(-1);
}
if (s->s2->tmp.cert_type != 0)
{
if (!(s->options &
SSL_OP_SSLREF2_REUSE_CERT_TYPE_BUG))
{
SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CERT_TYPE_NOT_ZERO);
return(-1);
}
}
if (s->s2->tmp.csl != 0)
{
SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_REUSE_CIPHER_LIST_NOT_ZERO);
return(-1);
}
}
else
{
#ifdef undef
/* very bad */
memset(s->session->session_id,0,
SSL_MAX_SSL_SESSION_ID_LENGTH_IN_BYTES);
s->session->session_id_length=0;
*/
#endif
/* we need to do this in case we were trying to reuse a
* client session but others are already reusing it.
* If this was a new 'blank' session ID, the session-id
* length will still be 0 */
if (s->session->session_id_length > 0)
{
if (!ssl_get_new_session(s,0))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
}
if (ssl2_set_certificate(s,s->s2->tmp.cert_type,
s->s2->tmp.cert_length,p) <= 0)
{
ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
return(-1);
}
p+=s->s2->tmp.cert_length;
if (s->s2->tmp.csl == 0)
{
ssl2_return_error(s,SSL2_PE_NO_CIPHER);
SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_LIST);
return(-1);
}
/* We have just received a list of ciphers back from the
* server. We need to get the ones that match, then select
* the one we want the most :-). */
/* load the ciphers */
sk=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.csl,
&s->session->ciphers);
p+=s->s2->tmp.csl;
if (sk == NULL)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_HELLO,ERR_R_MALLOC_FAILURE);
return(-1);
}
(void)sk_SSL_CIPHER_set_cmp_func(sk,ssl_cipher_ptr_id_cmp);
/* get the array of ciphers we will accept */
cl=SSL_get_ciphers(s);
(void)sk_SSL_CIPHER_set_cmp_func(cl,ssl_cipher_ptr_id_cmp);
/*
* If server preference flag set, choose the first
* (highest priority) cipher the server sends, otherwise
* client preference has priority.
*/
if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
{
prio = sk;
allow = cl;
}
else
{
prio = cl;
allow = sk;
}
/* In theory we could have ciphers sent back that we
* don't want to use but that does not matter since we
* will check against the list we originally sent and
* for performance reasons we should not bother to match
* the two lists up just to check. */
for (i=0; i<sk_SSL_CIPHER_num(prio); i++)
{
if (sk_SSL_CIPHER_find(allow,
sk_SSL_CIPHER_value(prio,i)) >= 0)
break;
}
if (i >= sk_SSL_CIPHER_num(prio))
{
ssl2_return_error(s,SSL2_PE_NO_CIPHER);
SSLerr(SSL_F_GET_SERVER_HELLO,SSL_R_NO_CIPHER_MATCH);
return(-1);
}
s->session->cipher=sk_SSL_CIPHER_value(prio,i);
if (s->session->peer != NULL) /* can't happen*/
{
ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
return(-1);
}
s->session->peer = s->session->sess_cert->peer_key->x509;
/* peer_key->x509 has been set by ssl2_set_certificate. */
CRYPTO_add(&s->session->peer->references, 1, CRYPTO_LOCK_X509);
}
if (s->session->sess_cert == NULL
|| s->session->peer != s->session->sess_cert->peer_key->x509)
/* can't happen */
{
ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
return(-1);
}
s->s2->conn_id_length=s->s2->tmp.conn_id_length;
if (s->s2->conn_id_length > sizeof s->s2->conn_id)
{
ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_HELLO, SSL_R_SSL2_CONNECTION_ID_TOO_LONG);
return -1;
}
memcpy(s->s2->conn_id,p,s->s2->tmp.conn_id_length);
return(1);
}
static int client_hello(SSL *s)
{
unsigned char *buf;
unsigned char *p,*d;
/* CIPHER **cipher;*/
int i,n,j;
buf=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_SEND_CLIENT_HELLO_A)
{
if ((s->session == NULL) ||
(s->session->ssl_version != s->version))
{
if (!ssl_get_new_session(s,0))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
}
/* else use the pre-loaded session */
p=buf; /* header */
d=p+9; /* data section */
*(p++)=SSL2_MT_CLIENT_HELLO; /* type */
s2n(SSL2_VERSION,p); /* version */
n=j=0;
n=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),d,0);
d+=n;
if (n == 0)
{
SSLerr(SSL_F_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
return(-1);
}
s2n(n,p); /* cipher spec num bytes */
if ((s->session->session_id_length > 0) &&
(s->session->session_id_length <=
SSL2_MAX_SSL_SESSION_ID_LENGTH))
{
i=s->session->session_id_length;
s2n(i,p); /* session id length */
memcpy(d,s->session->session_id,(unsigned int)i);
d+=i;
}
else
{
s2n(0,p);
}
s->s2->challenge_length=SSL2_CHALLENGE_LENGTH;
s2n(SSL2_CHALLENGE_LENGTH,p); /* challenge length */
/*challenge id data*/
if (RAND_pseudo_bytes(s->s2->challenge,SSL2_CHALLENGE_LENGTH) <= 0)
return -1;
memcpy(d,s->s2->challenge,SSL2_CHALLENGE_LENGTH);
d+=SSL2_CHALLENGE_LENGTH;
s->state=SSL2_ST_SEND_CLIENT_HELLO_B;
s->init_num=d-buf;
s->init_off=0;
}
/* SSL2_ST_SEND_CLIENT_HELLO_B */
return(ssl2_do_write(s));
}
static int client_master_key(SSL *s)
{
unsigned char *buf;
unsigned char *p,*d;
int clear,enc,karg,i;
SSL_SESSION *sess;
const EVP_CIPHER *c;
const EVP_MD *md;
buf=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_SEND_CLIENT_MASTER_KEY_A)
{
if (!ssl_cipher_get_evp(s->session,&c,&md,NULL))
{
ssl2_return_error(s,SSL2_PE_NO_CIPHER);
SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
return(-1);
}
sess=s->session;
p=buf;
d=p+10;
*(p++)=SSL2_MT_CLIENT_MASTER_KEY;/* type */
i=ssl_put_cipher_by_char(s,sess->cipher,p);
p+=i;
/* make key_arg data */
i=EVP_CIPHER_iv_length(c);
sess->key_arg_length=i;
if (i > SSL_MAX_KEY_ARG_LENGTH)
{
ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
return -1;
}
if (i > 0)
if (RAND_pseudo_bytes(sess->key_arg,i) <= 0)
return -1;
/* make a master key */
i=EVP_CIPHER_key_length(c);
sess->master_key_length=i;
if (i > 0)
{
if (i > (int)sizeof(sess->master_key))
{
ssl2_return_error(s, SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
return -1;
}
if (RAND_bytes(sess->master_key,i) <= 0)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
}
if (sess->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
enc=8;
else if (SSL_C_IS_EXPORT(sess->cipher))
enc=5;
else
enc=i;
if ((int)i < enc)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_CIPHER_TABLE_SRC_ERROR);
return(-1);
}
clear=i-enc;
s2n(clear,p);
memcpy(d,sess->master_key,(unsigned int)clear);
d+=clear;
enc=ssl_rsa_public_encrypt(sess->sess_cert,enc,
&(sess->master_key[clear]),d,
(s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
if (enc <= 0)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_CLIENT_MASTER_KEY,SSL_R_PUBLIC_KEY_ENCRYPT_ERROR);
return(-1);
}
#ifdef PKCS1_CHECK
if (s->options & SSL_OP_PKCS1_CHECK_1) d[1]++;
if (s->options & SSL_OP_PKCS1_CHECK_2)
sess->master_key[clear]++;
#endif
s2n(enc,p);
d+=enc;
karg=sess->key_arg_length;
s2n(karg,p); /* key arg size */
if (karg > (int)sizeof(sess->key_arg))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
return -1;
}
memcpy(d,sess->key_arg,(unsigned int)karg);
d+=karg;
s->state=SSL2_ST_SEND_CLIENT_MASTER_KEY_B;
s->init_num=d-buf;
s->init_off=0;
}
/* SSL2_ST_SEND_CLIENT_MASTER_KEY_B */
return(ssl2_do_write(s));
}
static int client_finished(SSL *s)
{
unsigned char *p;
if (s->state == SSL2_ST_SEND_CLIENT_FINISHED_A)
{
p=(unsigned char *)s->init_buf->data;
*(p++)=SSL2_MT_CLIENT_FINISHED;
if (s->s2->conn_id_length > sizeof s->s2->conn_id)
{
SSLerr(SSL_F_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
return -1;
}
memcpy(p,s->s2->conn_id,(unsigned int)s->s2->conn_id_length);
s->state=SSL2_ST_SEND_CLIENT_FINISHED_B;
s->init_num=s->s2->conn_id_length+1;
s->init_off=0;
}
return(ssl2_do_write(s));
}
/* read the data and then respond */
static int client_certificate(SSL *s)
{
unsigned char *buf;
unsigned char *p,*d;
int i;
unsigned int n;
int cert_ch_len;
unsigned char *cert_ch;
buf=(unsigned char *)s->init_buf->data;
/* We have a cert associated with the SSL, so attach it to
* the session if it does not have one */
if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_A)
{
i=ssl2_read(s,(char *)&(buf[s->init_num]),
SSL2_MAX_CERT_CHALLENGE_LENGTH+2-s->init_num);
if (i<(SSL2_MIN_CERT_CHALLENGE_LENGTH+2-s->init_num))
return(ssl2_part_read(s,SSL_F_CLIENT_CERTIFICATE,i));
s->init_num += i;
if (s->msg_callback)
s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* REQUEST-CERTIFICATE */
/* type=buf[0]; */
/* type eq x509 */
if (buf[1] != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
{
ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_AUTHENTICATION_TYPE);
return(-1);
}
if ((s->cert == NULL) ||
(s->cert->key->x509 == NULL) ||
(s->cert->key->privatekey == NULL))
{
s->state=SSL2_ST_X509_GET_CLIENT_CERTIFICATE;
}
else
s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
}
cert_ch = buf + 2;
cert_ch_len = s->init_num - 2;
if (s->state == SSL2_ST_X509_GET_CLIENT_CERTIFICATE)
{
X509 *x509=NULL;
EVP_PKEY *pkey=NULL;
/* If we get an error we need to
* ssl->rwstate=SSL_X509_LOOKUP;
* return(error);
* We should then be retried when things are ok and we
* can get a cert or not */
i=0;
if (s->ctx->client_cert_cb != NULL)
{
i=s->ctx->client_cert_cb(s,&(x509),&(pkey));
}
if (i < 0)
{
s->rwstate=SSL_X509_LOOKUP;
return(-1);
}
s->rwstate=SSL_NOTHING;
if ((i == 1) && (pkey != NULL) && (x509 != NULL))
{
s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_C;
if ( !SSL_use_certificate(s,x509) ||
!SSL_use_PrivateKey(s,pkey))
{
i=0;
}
X509_free(x509);
EVP_PKEY_free(pkey);
}
else if (i == 1)
{
if (x509 != NULL) X509_free(x509);
if (pkey != NULL) EVP_PKEY_free(pkey);
SSLerr(SSL_F_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
i=0;
}
if (i == 0)
{
/* We have no client certificate to respond with
* so send the correct error message back */
s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_B;
p=buf;
*(p++)=SSL2_MT_ERROR;
s2n(SSL2_PE_NO_CERTIFICATE,p);
s->init_off=0;
s->init_num=3;
/* Write is done at the end */
}
}
if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_B)
{
return(ssl2_do_write(s));
}
if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_C)
{
EVP_MD_CTX ctx;
/* ok, now we calculate the checksum
* do it first so we can reuse buf :-) */
p=buf;
EVP_MD_CTX_init(&ctx);
EVP_SignInit_ex(&ctx,s->ctx->rsa_md5, NULL);
EVP_SignUpdate(&ctx,s->s2->key_material,
s->s2->key_material_length);
EVP_SignUpdate(&ctx,cert_ch,(unsigned int)cert_ch_len);
n=i2d_X509(s->session->sess_cert->peer_key->x509,&p);
EVP_SignUpdate(&ctx,buf,(unsigned int)n);
p=buf;
d=p+6;
*(p++)=SSL2_MT_CLIENT_CERTIFICATE;
*(p++)=SSL2_CT_X509_CERTIFICATE;
n=i2d_X509(s->cert->key->x509,&d);
s2n(n,p);
if (!EVP_SignFinal(&ctx,d,&n,s->cert->key->privatekey))
{
/* this is not good. If things have failed it
* means there so something wrong with the key.
* We will continue with a 0 length signature
*/
}
EVP_MD_CTX_cleanup(&ctx);
s2n(n,p);
d+=n;
s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_D;
s->init_num=d-buf;
s->init_off=0;
}
/* if (s->state == SSL2_ST_SEND_CLIENT_CERTIFICATE_D) */
return(ssl2_do_write(s));
}
static int get_server_verify(SSL *s)
{
unsigned char *p;
int i, n, len;
p=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_GET_SERVER_VERIFY_A)
{
i=ssl2_read(s,(char *)&(p[s->init_num]),1-s->init_num);
if (i < (1-s->init_num))
return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
s->init_num += i;
s->state= SSL2_ST_GET_SERVER_VERIFY_B;
if (*p != SSL2_MT_SERVER_VERIFY)
{
if (p[0] != SSL2_MT_ERROR)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_VERIFY,
SSL_R_READ_WRONG_PACKET_TYPE);
}
else
{
SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_PEER_ERROR);
/* try to read the error message */
i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
}
return(-1);
}
}
p=(unsigned char *)s->init_buf->data;
len = 1 + s->s2->challenge_length;
n = len - s->init_num;
i = ssl2_read(s,(char *)&(p[s->init_num]),n);
if (i < n)
return(ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i));
if (s->msg_callback)
s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* SERVER-VERIFY */
p += 1;
if (CRYPTO_memcmp(p,s->s2->challenge,s->s2->challenge_length) != 0)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_VERIFY,SSL_R_CHALLENGE_IS_DIFFERENT);
return(-1);
}
return(1);
}
static int get_server_finished(SSL *s)
{
unsigned char *buf;
unsigned char *p;
int i, n, len;
buf=(unsigned char *)s->init_buf->data;
p=buf;
if (s->state == SSL2_ST_GET_SERVER_FINISHED_A)
{
i=ssl2_read(s,(char *)&(buf[s->init_num]),1-s->init_num);
if (i < (1-s->init_num))
return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
s->init_num += i;
if (*p == SSL2_MT_REQUEST_CERTIFICATE)
{
s->state=SSL2_ST_SEND_CLIENT_CERTIFICATE_A;
return(1);
}
else if (*p != SSL2_MT_SERVER_FINISHED)
{
if (p[0] != SSL2_MT_ERROR)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
}
else
{
SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_PEER_ERROR);
/* try to read the error message */
i=ssl2_read(s,(char *)&(p[s->init_num]),3-s->init_num);
return ssl2_part_read(s,SSL_F_GET_SERVER_VERIFY,i);
}
return(-1);
}
s->state=SSL2_ST_GET_SERVER_FINISHED_B;
}
len = 1 + SSL2_SSL_SESSION_ID_LENGTH;
n = len - s->init_num;
i = ssl2_read(s,(char *)&(buf[s->init_num]), n);
if (i < n) /* XXX could be shorter than SSL2_SSL_SESSION_ID_LENGTH, that's the maximum */
return(ssl2_part_read(s,SSL_F_GET_SERVER_FINISHED,i));
s->init_num += i;
if (s->msg_callback)
s->msg_callback(0, s->version, 0, buf, (size_t)s->init_num, s, s->msg_callback_arg); /* SERVER-FINISHED */
if (!s->hit) /* new session */
{
/* new session-id */
/* Make sure we were not trying to re-use an old SSL_SESSION
* or bad things can happen */
/* ZZZZZZZZZZZZZ */
s->session->session_id_length=SSL2_SSL_SESSION_ID_LENGTH;
memcpy(s->session->session_id,p+1,SSL2_SSL_SESSION_ID_LENGTH);
}
else
{
if (!(s->options & SSL_OP_MICROSOFT_SESS_ID_BUG))
{
if ((s->session->session_id_length > sizeof s->session->session_id)
|| (0 != memcmp(buf + 1, s->session->session_id,
(unsigned int)s->session->session_id_length)))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_SERVER_FINISHED,SSL_R_SSL_SESSION_ID_IS_DIFFERENT);
return(-1);
}
}
}
s->state = SSL_ST_OK;
return(1);
}
/* loads in the certificate from the server */
int ssl2_set_certificate(SSL *s, int type, int len, const unsigned char *data)
{
STACK_OF(X509) *sk=NULL;
EVP_PKEY *pkey=NULL;
SESS_CERT *sc=NULL;
int i;
X509 *x509=NULL;
int ret=0;
x509=d2i_X509(NULL,&data,(long)len);
if (x509 == NULL)
{
SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_X509_LIB);
goto err;
}
if ((sk=sk_X509_new_null()) == NULL || !sk_X509_push(sk,x509))
{
SSLerr(SSL_F_SSL2_SET_CERTIFICATE,ERR_R_MALLOC_FAILURE);
goto err;
}
i=ssl_verify_cert_chain(s,sk);
if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0))
{
SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
goto err;
}
ERR_clear_error(); /* but we keep s->verify_result */
s->session->verify_result = s->verify_result;
/* server's cert for this session */
sc=ssl_sess_cert_new();
if (sc == NULL)
{
ret= -1;
goto err;
}
if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
s->session->sess_cert=sc;
sc->peer_pkeys[SSL_PKEY_RSA_ENC].x509=x509;
sc->peer_key= &(sc->peer_pkeys[SSL_PKEY_RSA_ENC]);
pkey=X509_get_pubkey(x509);
x509=NULL;
if (pkey == NULL)
{
SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_UNABLE_TO_EXTRACT_PUBLIC_KEY);
goto err;
}
if (pkey->type != EVP_PKEY_RSA)
{
SSLerr(SSL_F_SSL2_SET_CERTIFICATE,SSL_R_PUBLIC_KEY_NOT_RSA);
goto err;
}
if (!ssl_set_peer_cert_type(sc,SSL2_CT_X509_CERTIFICATE))
goto err;
ret=1;
err:
sk_X509_free(sk);
X509_free(x509);
EVP_PKEY_free(pkey);
return(ret);
}
static int ssl_rsa_public_encrypt(SESS_CERT *sc, int len, unsigned char *from,
unsigned char *to, int padding)
{
EVP_PKEY *pkey=NULL;
int i= -1;
if ((sc == NULL) || (sc->peer_key->x509 == NULL) ||
((pkey=X509_get_pubkey(sc->peer_key->x509)) == NULL))
{
SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_NO_PUBLICKEY);
return(-1);
}
if (pkey->type != EVP_PKEY_RSA)
{
SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
goto end;
}
/* we have the public key */
i=RSA_public_encrypt(len,from,to,pkey->pkey.rsa,padding);
if (i < 0)
SSLerr(SSL_F_SSL_RSA_PUBLIC_ENCRYPT,ERR_R_RSA_LIB);
end:
EVP_PKEY_free(pkey);
return(i);
}
#else /* !OPENSSL_NO_SSL2 */
# if PEDANTIC
static void *dummy=&dummy;
# endif
#endif
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