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openssl/ssl/s2_srvr.c
Ben Laurie 68d2cf51bc Reduce version skew: trivia (I hope).
2012-06-03 22:03:37 +00:00

1148 lines
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/* ssl/s2_srvr.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/bio.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
static const SSL_METHOD *ssl2_get_server_method(int ver);
static int get_client_master_key(SSL *s);
static int get_client_hello(SSL *s);
static int server_hello(SSL *s);
static int get_client_finished(SSL *s);
static int server_verify(SSL *s);
static int server_finish(SSL *s);
static int request_certificate(SSL *s);
static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
unsigned char *to,int padding);
#define BREAK break
static const SSL_METHOD *ssl2_get_server_method(int ver)
{
if (ver == SSL2_VERSION)
return(SSLv2_server_method());
else
return(NULL);
}
IMPLEMENT_ssl2_meth_func(SSLv2_server_method,
ssl2_accept,
ssl_undefined_function,
ssl2_get_server_method)
int ssl2_accept(SSL *s)
{
unsigned long l=(unsigned long)time(NULL);
BUF_MEM *buf=NULL;
int ret= -1;
long num1;
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);
if (s->cert == NULL)
{
SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
return(-1);
}
clear_sys_error();
for (;;)
{
state=s->state;
switch (s->state)
{
case SSL_ST_BEFORE:
case SSL_ST_ACCEPT:
case SSL_ST_BEFORE|SSL_ST_ACCEPT:
case SSL_ST_OK|SSL_ST_ACCEPT:
s->server=1;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
s->version=SSL2_VERSION;
s->type=SSL_ST_ACCEPT;
buf=s->init_buf;
if ((buf == NULL) && ((buf=BUF_MEM_new()) == NULL))
{ ret= -1; goto end; }
if (!BUF_MEM_grow(buf,(int)
SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER))
{ ret= -1; goto end; }
s->init_buf=buf;
s->init_num=0;
s->ctx->stats.sess_accept++;
s->handshake_func=ssl2_accept;
s->state=SSL2_ST_GET_CLIENT_HELLO_A;
BREAK;
case SSL2_ST_GET_CLIENT_HELLO_A:
case SSL2_ST_GET_CLIENT_HELLO_B:
case SSL2_ST_GET_CLIENT_HELLO_C:
s->shutdown=0;
ret=get_client_hello(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_SEND_SERVER_HELLO_A;
BREAK;
case SSL2_ST_SEND_SERVER_HELLO_A:
case SSL2_ST_SEND_SERVER_HELLO_B:
ret=server_hello(s);
if (ret <= 0) goto end;
s->init_num=0;
if (!s->hit)
{
s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_A;
BREAK;
}
else
{
s->state=SSL2_ST_SERVER_START_ENCRYPTION;
BREAK;
}
case SSL2_ST_GET_CLIENT_MASTER_KEY_A:
case SSL2_ST_GET_CLIENT_MASTER_KEY_B:
ret=get_client_master_key(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_SERVER_START_ENCRYPTION;
BREAK;
case SSL2_ST_SERVER_START_ENCRYPTION:
/* Ok we how have sent all the stuff needed to
* start encrypting, the next packet back will
* be encrypted. */
if (!ssl2_enc_init(s,0))
{ ret= -1; goto end; }
s->s2->clear_text=0;
s->state=SSL2_ST_SEND_SERVER_VERIFY_A;
BREAK;
case SSL2_ST_SEND_SERVER_VERIFY_A:
case SSL2_ST_SEND_SERVER_VERIFY_B:
ret=server_verify(s);
if (ret <= 0) goto end;
s->init_num=0;
if (s->hit)
{
/* If we are in here, we have been
* buffering the output, so we need to
* flush it and remove buffering from
* future traffic */
s->state=SSL2_ST_SEND_SERVER_VERIFY_C;
BREAK;
}
else
{
s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
break;
}
case SSL2_ST_SEND_SERVER_VERIFY_C:
/* get the number of bytes to write */
num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
if (num1 > 0)
{
s->rwstate=SSL_WRITING;
num1=BIO_flush(s->wbio);
if (num1 <= 0) { ret= -1; goto end; }
s->rwstate=SSL_NOTHING;
}
/* flushed and now remove buffering */
s->wbio=BIO_pop(s->wbio);
s->state=SSL2_ST_GET_CLIENT_FINISHED_A;
BREAK;
case SSL2_ST_GET_CLIENT_FINISHED_A:
case SSL2_ST_GET_CLIENT_FINISHED_B:
ret=get_client_finished(s);
if (ret <= 0)
goto end;
s->init_num=0;
s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_A;
BREAK;
case SSL2_ST_SEND_REQUEST_CERTIFICATE_A:
case SSL2_ST_SEND_REQUEST_CERTIFICATE_B:
case SSL2_ST_SEND_REQUEST_CERTIFICATE_C:
case SSL2_ST_SEND_REQUEST_CERTIFICATE_D:
/* don't do a 'request certificate' if we
* don't want to, or we already have one, and
* we only want to do it once. */
if (!(s->verify_mode & SSL_VERIFY_PEER) ||
((s->session->peer != NULL) &&
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)))
{
s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
break;
}
else
{
ret=request_certificate(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL2_ST_SEND_SERVER_FINISHED_A;
}
BREAK;
case SSL2_ST_SEND_SERVER_FINISHED_A:
case SSL2_ST_SEND_SERVER_FINISHED_B:
ret=server_finish(s);
if (ret <= 0) goto end;
s->init_num=0;
s->state=SSL_ST_OK;
break;
case SSL_ST_OK:
BUF_MEM_free(s->init_buf);
ssl_free_wbio_buffer(s);
s->init_buf=NULL;
s->init_num=0;
/* ERR_clear_error();*/
ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
s->ctx->stats.sess_accept_good++;
/* s->server=1; */
ret=1;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
goto end;
/* BREAK; */
default:
SSLerr(SSL_F_SSL2_ACCEPT,SSL_R_UNKNOWN_STATE);
ret= -1;
goto end;
/* BREAK; */
}
if ((cb != NULL) && (s->state != state))
{
new_state=s->state;
s->state=state;
cb(s,SSL_CB_ACCEPT_LOOP,1);
s->state=new_state;
}
}
end:
s->in_handshake--;
if (cb != NULL)
cb(s,SSL_CB_ACCEPT_EXIT,ret);
return(ret);
}
static int get_client_master_key(SSL *s)
{
int is_export,i,n,keya,ek;
unsigned long len;
unsigned char *p;
const SSL_CIPHER *cp;
const EVP_CIPHER *c;
const EVP_MD *md;
p=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_GET_CLIENT_MASTER_KEY_A)
{
i=ssl2_read(s,(char *)&(p[s->init_num]),10-s->init_num);
if (i < (10-s->init_num))
return(ssl2_part_read(s,SSL_F_GET_CLIENT_MASTER_KEY,i));
s->init_num = 10;
if (*(p++) != SSL2_MT_CLIENT_MASTER_KEY)
{
if (p[-1] != SSL2_MT_ERROR)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_READ_WRONG_PACKET_TYPE);
}
else
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_PEER_ERROR);
return(-1);
}
cp=ssl2_get_cipher_by_char(p);
if (cp == NULL)
{
ssl2_return_error(s,SSL2_PE_NO_CIPHER);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_NO_CIPHER_MATCH);
return(-1);
}
s->session->cipher= cp;
p+=3;
n2s(p,i); s->s2->tmp.clear=i;
n2s(p,i); s->s2->tmp.enc=i;
n2s(p,i);
if(i > SSL_MAX_KEY_ARG_LENGTH)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, SSL_R_KEY_ARG_TOO_LONG);
return -1;
}
s->session->key_arg_length=i;
s->state=SSL2_ST_GET_CLIENT_MASTER_KEY_B;
}
/* SSL2_ST_GET_CLIENT_MASTER_KEY_B */
p=(unsigned char *)s->init_buf->data;
if (s->init_buf->length < SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
return -1;
}
keya=s->session->key_arg_length;
len = 10 + (unsigned long)s->s2->tmp.clear + (unsigned long)s->s2->tmp.enc + (unsigned long)keya;
if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_MESSAGE_TOO_LONG);
return -1;
}
n = (int)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_CLIENT_MASTER_KEY,i));
if (s->msg_callback)
s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-MASTER-KEY */
p += 10;
memcpy(s->session->key_arg,&(p[s->s2->tmp.clear+s->s2->tmp.enc]),
(unsigned int)keya);
if (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_NO_PRIVATEKEY);
return(-1);
}
i=ssl_rsa_private_decrypt(s->cert,s->s2->tmp.enc,
&(p[s->s2->tmp.clear]),&(p[s->s2->tmp.clear]),
(s->s2->ssl2_rollback)?RSA_SSLV23_PADDING:RSA_PKCS1_PADDING);
is_export=SSL_C_IS_EXPORT(s->session->cipher);
if (!ssl_cipher_get_evp(s->session,&c,&md,NULL,NULL,NULL))
{
ssl2_return_error(s,SSL2_PE_NO_CIPHER);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_PROBLEMS_MAPPING_CIPHER_FUNCTIONS);
return(0);
}
if (s->session->cipher->algorithm2 & SSL2_CF_8_BYTE_ENC)
{
is_export=1;
ek=8;
}
else
ek=5;
/* bad decrypt */
#if 1
/* If a bad decrypt, continue with protocol but with a
* random master secret (Bleichenbacher attack) */
if ((i < 0) ||
((!is_export && (i != EVP_CIPHER_key_length(c)))
|| (is_export && ((i != ek) || (s->s2->tmp.clear+(unsigned int)i !=
(unsigned int)EVP_CIPHER_key_length(c))))))
{
ERR_clear_error();
if (is_export)
i=ek;
else
i=EVP_CIPHER_key_length(c);
if (RAND_pseudo_bytes(p,i) <= 0)
return 0;
}
#else
if (i < 0)
{
error=1;
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_BAD_RSA_DECRYPT);
}
/* incorrect number of key bytes for non export cipher */
else if ((!is_export && (i != EVP_CIPHER_key_length(c)))
|| (is_export && ((i != ek) || (s->s2->tmp.clear+i !=
EVP_CIPHER_key_length(c)))))
{
error=1;
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY,SSL_R_WRONG_NUMBER_OF_KEY_BITS);
}
if (error)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
#endif
if (is_export) i+=s->s2->tmp.clear;
if (i > SSL_MAX_MASTER_KEY_LENGTH)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_MASTER_KEY, ERR_R_INTERNAL_ERROR);
return -1;
}
s->session->master_key_length=i;
memcpy(s->session->master_key,p,(unsigned int)i);
return(1);
}
static int get_client_hello(SSL *s)
{
int i,n;
unsigned long len;
unsigned char *p;
STACK_OF(SSL_CIPHER) *cs; /* a stack of SSL_CIPHERS */
STACK_OF(SSL_CIPHER) *cl; /* the ones we want to use */
STACK_OF(SSL_CIPHER) *prio, *allow;
int z;
/* This is a bit of a hack to check for the correct packet
* type the first time round. */
if (s->state == SSL2_ST_GET_CLIENT_HELLO_A)
{
s->first_packet=1;
s->state=SSL2_ST_GET_CLIENT_HELLO_B;
}
p=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_GET_CLIENT_HELLO_B)
{
i=ssl2_read(s,(char *)&(p[s->init_num]),9-s->init_num);
if (i < (9-s->init_num))
return(ssl2_part_read(s,SSL_F_GET_CLIENT_HELLO,i));
s->init_num = 9;
if (*(p++) != SSL2_MT_CLIENT_HELLO)
{
if (p[-1] != SSL2_MT_ERROR)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_READ_WRONG_PACKET_TYPE);
}
else
SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_PEER_ERROR);
return(-1);
}
n2s(p,i);
if (i < s->version) s->version=i;
n2s(p,i); s->s2->tmp.cipher_spec_length=i;
n2s(p,i); s->s2->tmp.session_id_length=i;
n2s(p,i); s->s2->challenge_length=i;
if ( (i < SSL2_MIN_CHALLENGE_LENGTH) ||
(i > SSL2_MAX_CHALLENGE_LENGTH))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_INVALID_CHALLENGE_LENGTH);
return(-1);
}
s->state=SSL2_ST_GET_CLIENT_HELLO_C;
}
/* SSL2_ST_GET_CLIENT_HELLO_C */
p=(unsigned char *)s->init_buf->data;
len = 9 + (unsigned long)s->s2->tmp.cipher_spec_length + (unsigned long)s->s2->challenge_length + (unsigned long)s->s2->tmp.session_id_length;
if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_MESSAGE_TOO_LONG);
return -1;
}
n = (int)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_CLIENT_HELLO,i));
if (s->msg_callback)
s->msg_callback(0, s->version, 0, p, (size_t)len, s, s->msg_callback_arg); /* CLIENT-HELLO */
p += 9;
/* get session-id before cipher stuff so we can get out session
* structure if it is cached */
/* session-id */
if ((s->s2->tmp.session_id_length != 0) &&
(s->s2->tmp.session_id_length != SSL2_SSL_SESSION_ID_LENGTH))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_BAD_SSL_SESSION_ID_LENGTH);
return(-1);
}
if (s->s2->tmp.session_id_length == 0)
{
if (!ssl_get_new_session(s,1))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
}
else
{
i=ssl_get_prev_session(s,&(p[s->s2->tmp.cipher_spec_length]),
s->s2->tmp.session_id_length, NULL);
if (i == 1)
{ /* previous session */
s->hit=1;
}
else if (i == -1)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
else
{
if (s->cert == NULL)
{
ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
SSLerr(SSL_F_GET_CLIENT_HELLO,SSL_R_NO_CERTIFICATE_SET);
return(-1);
}
if (!ssl_get_new_session(s,1))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
return(-1);
}
}
}
if (!s->hit)
{
cs=ssl_bytes_to_cipher_list(s,p,s->s2->tmp.cipher_spec_length,
&s->session->ciphers);
if (cs == NULL) goto mem_err;
cl=SSL_get_ciphers(s);
if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
{
prio=sk_SSL_CIPHER_dup(cl);
if (prio == NULL) goto mem_err;
allow = cs;
}
else
{
prio = cs;
allow = cl;
}
for (z=0; z<sk_SSL_CIPHER_num(prio); z++)
{
if (sk_SSL_CIPHER_find(allow,sk_SSL_CIPHER_value(prio,z)) < 0)
{
(void)sk_SSL_CIPHER_delete(prio,z);
z--;
}
}
if (s->options & SSL_OP_CIPHER_SERVER_PREFERENCE)
{
sk_SSL_CIPHER_free(s->session->ciphers);
s->session->ciphers = prio;
}
/* s->session->ciphers should now have a list of
* ciphers that are on both the client and server.
* This list is ordered by the order the client sent
* the ciphers or in the order of the server's preference
* if SSL_OP_CIPHER_SERVER_PREFERENCE was set.
*/
}
p+=s->s2->tmp.cipher_spec_length;
/* done cipher selection */
/* session id extracted already */
p+=s->s2->tmp.session_id_length;
/* challenge */
if (s->s2->challenge_length > sizeof s->s2->challenge)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
return -1;
}
memcpy(s->s2->challenge,p,(unsigned int)s->s2->challenge_length);
return(1);
mem_err:
SSLerr(SSL_F_GET_CLIENT_HELLO,ERR_R_MALLOC_FAILURE);
return(0);
}
static int server_hello(SSL *s)
{
unsigned char *p,*d;
int n,hit;
p=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_SEND_SERVER_HELLO_A)
{
d=p+11;
*(p++)=SSL2_MT_SERVER_HELLO; /* type */
hit=s->hit;
*(p++)=(unsigned char)hit;
#if 1
if (!hit)
{
if (s->session->sess_cert != NULL)
/* This can't really happen because get_client_hello
* has called ssl_get_new_session, which does not set
* sess_cert. */
ssl_sess_cert_free(s->session->sess_cert);
s->session->sess_cert = ssl_sess_cert_new();
if (s->session->sess_cert == NULL)
{
SSLerr(SSL_F_SERVER_HELLO, ERR_R_MALLOC_FAILURE);
return(-1);
}
}
/* If 'hit' is set, then s->sess_cert may be non-NULL or NULL,
* depending on whether it survived in the internal cache
* or was retrieved from an external cache.
* If it is NULL, we cannot put any useful data in it anyway,
* so we don't touch it.
*/
#else /* That's what used to be done when cert_st and sess_cert_st were
* the same. */
if (!hit)
{ /* else add cert to session */
CRYPTO_add(&s->cert->references,1,CRYPTO_LOCK_SSL_CERT);
if (s->session->sess_cert != NULL)
ssl_cert_free(s->session->sess_cert);
s->session->sess_cert=s->cert;
}
else /* We have a session id-cache hit, if the
* session-id has no certificate listed against
* the 'cert' structure, grab the 'old' one
* listed against the SSL connection */
{
if (s->session->sess_cert == NULL)
{
CRYPTO_add(&s->cert->references,1,
CRYPTO_LOCK_SSL_CERT);
s->session->sess_cert=s->cert;
}
}
#endif
if (s->cert == NULL)
{
ssl2_return_error(s,SSL2_PE_NO_CERTIFICATE);
SSLerr(SSL_F_SERVER_HELLO,SSL_R_NO_CERTIFICATE_SPECIFIED);
return(-1);
}
if (hit)
{
*(p++)=0; /* no certificate type */
s2n(s->version,p); /* version */
s2n(0,p); /* cert len */
s2n(0,p); /* ciphers len */
}
else
{
/* EAY EAY */
/* put certificate type */
*(p++)=SSL2_CT_X509_CERTIFICATE;
s2n(s->version,p); /* version */
n=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
s2n(n,p); /* certificate length */
i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&d);
n=0;
/* lets send out the ciphers we like in the
* prefered order */
n=ssl_cipher_list_to_bytes(s,s->session->ciphers,d,0);
d+=n;
s2n(n,p); /* add cipher length */
}
/* make and send conn_id */
s2n(SSL2_CONNECTION_ID_LENGTH,p); /* add conn_id length */
s->s2->conn_id_length=SSL2_CONNECTION_ID_LENGTH;
if (RAND_pseudo_bytes(s->s2->conn_id,(int)s->s2->conn_id_length) <= 0)
return -1;
memcpy(d,s->s2->conn_id,SSL2_CONNECTION_ID_LENGTH);
d+=SSL2_CONNECTION_ID_LENGTH;
s->state=SSL2_ST_SEND_SERVER_HELLO_B;
s->init_num=d-(unsigned char *)s->init_buf->data;
s->init_off=0;
}
/* SSL2_ST_SEND_SERVER_HELLO_B */
/* If we are using TCP/IP, the performance is bad if we do 2
* writes without a read between them. This occurs when
* Session-id reuse is used, so I will put in a buffering module
*/
if (s->hit)
{
if (!ssl_init_wbio_buffer(s,1)) return(-1);
}
return(ssl2_do_write(s));
}
static int get_client_finished(SSL *s)
{
unsigned char *p;
int i, n;
unsigned long len;
p=(unsigned char *)s->init_buf->data;
if (s->state == SSL2_ST_GET_CLIENT_FINISHED_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_CLIENT_FINISHED,i));
s->init_num += i;
if (*p != SSL2_MT_CLIENT_FINISHED)
{
if (*p != SSL2_MT_ERROR)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_READ_WRONG_PACKET_TYPE);
}
else
{
SSLerr(SSL_F_GET_CLIENT_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_CLIENT_FINISHED_B;
}
/* SSL2_ST_GET_CLIENT_FINISHED_B */
if (s->s2->conn_id_length > sizeof s->s2->conn_id)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_FINISHED, ERR_R_INTERNAL_ERROR);
return -1;
}
len = 1 + (unsigned long)s->s2->conn_id_length;
n = (int)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_CLIENT_FINISHED,i));
}
if (s->msg_callback)
s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-FINISHED */
p += 1;
if (memcmp(p,s->s2->conn_id,s->s2->conn_id_length) != 0)
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_GET_CLIENT_FINISHED,SSL_R_CONNECTION_ID_IS_DIFFERENT);
return(-1);
}
return(1);
}
static int server_verify(SSL *s)
{
unsigned char *p;
if (s->state == SSL2_ST_SEND_SERVER_VERIFY_A)
{
p=(unsigned char *)s->init_buf->data;
*(p++)=SSL2_MT_SERVER_VERIFY;
if (s->s2->challenge_length > sizeof s->s2->challenge)
{
SSLerr(SSL_F_SERVER_VERIFY, ERR_R_INTERNAL_ERROR);
return -1;
}
memcpy(p,s->s2->challenge,(unsigned int)s->s2->challenge_length);
/* p+=s->s2->challenge_length; */
s->state=SSL2_ST_SEND_SERVER_VERIFY_B;
s->init_num=s->s2->challenge_length+1;
s->init_off=0;
}
return(ssl2_do_write(s));
}
static int server_finish(SSL *s)
{
unsigned char *p;
if (s->state == SSL2_ST_SEND_SERVER_FINISHED_A)
{
p=(unsigned char *)s->init_buf->data;
*(p++)=SSL2_MT_SERVER_FINISHED;
if (s->session->session_id_length > sizeof s->session->session_id)
{
SSLerr(SSL_F_SERVER_FINISH, ERR_R_INTERNAL_ERROR);
return -1;
}
memcpy(p,s->session->session_id, (unsigned int)s->session->session_id_length);
/* p+=s->session->session_id_length; */
s->state=SSL2_ST_SEND_SERVER_FINISHED_B;
s->init_num=s->session->session_id_length+1;
s->init_off=0;
}
/* SSL2_ST_SEND_SERVER_FINISHED_B */
return(ssl2_do_write(s));
}
/* send the request and check the response */
static int request_certificate(SSL *s)
{
const unsigned char *cp;
unsigned char *p,*p2,*buf2;
unsigned char *ccd;
int i,j,ctype,ret= -1;
unsigned long len;
X509 *x509=NULL;
STACK_OF(X509) *sk=NULL;
ccd=s->s2->tmp.ccl;
if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_A)
{
p=(unsigned char *)s->init_buf->data;
*(p++)=SSL2_MT_REQUEST_CERTIFICATE;
*(p++)=SSL2_AT_MD5_WITH_RSA_ENCRYPTION;
if (RAND_pseudo_bytes(ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH) <= 0)
return -1;
memcpy(p,ccd,SSL2_MIN_CERT_CHALLENGE_LENGTH);
s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_B;
s->init_num=SSL2_MIN_CERT_CHALLENGE_LENGTH+2;
s->init_off=0;
}
if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_B)
{
i=ssl2_do_write(s);
if (i <= 0)
{
ret=i;
goto end;
}
s->init_num=0;
s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_C;
}
if (s->state == SSL2_ST_SEND_REQUEST_CERTIFICATE_C)
{
p=(unsigned char *)s->init_buf->data;
i=ssl2_read(s,(char *)&(p[s->init_num]),6-s->init_num); /* try to read 6 octets ... */
if (i < 3-s->init_num) /* ... but don't call ssl2_part_read now if we got at least 3
* (probably NO-CERTIFICATE-ERROR) */
{
ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
goto end;
}
s->init_num += i;
if ((s->init_num >= 3) && (p[0] == SSL2_MT_ERROR))
{
n2s(p,i);
if (i != SSL2_PE_NO_CERTIFICATE)
{
/* not the error message we expected -- let ssl2_part_read handle it */
s->init_num -= 3;
ret = ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE, 3);
goto end;
}
if (s->msg_callback)
s->msg_callback(0, s->version, 0, p, 3, s, s->msg_callback_arg); /* ERROR */
/* this is the one place where we can recover from an SSL 2.0 error */
if (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)
{
ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
goto end;
}
ret=1;
goto end;
}
if ((*(p++) != SSL2_MT_CLIENT_CERTIFICATE) || (s->init_num < 6))
{
ssl2_return_error(s,SSL2_PE_UNDEFINED_ERROR);
SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_SHORT_READ);
goto end;
}
if (s->init_num != 6)
{
SSLerr(SSL_F_REQUEST_CERTIFICATE, ERR_R_INTERNAL_ERROR);
goto end;
}
/* ok we have a response */
/* certificate type, there is only one right now. */
ctype= *(p++);
if (ctype != SSL2_AT_MD5_WITH_RSA_ENCRYPTION)
{
ssl2_return_error(s,SSL2_PE_UNSUPPORTED_CERTIFICATE_TYPE);
SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_RESPONSE_ARGUMENT);
goto end;
}
n2s(p,i); s->s2->tmp.clen=i;
n2s(p,i); s->s2->tmp.rlen=i;
s->state=SSL2_ST_SEND_REQUEST_CERTIFICATE_D;
}
/* SSL2_ST_SEND_REQUEST_CERTIFICATE_D */
p=(unsigned char *)s->init_buf->data;
len = 6 + (unsigned long)s->s2->tmp.clen + (unsigned long)s->s2->tmp.rlen;
if (len > SSL2_MAX_RECORD_LENGTH_3_BYTE_HEADER)
{
SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_MESSAGE_TOO_LONG);
goto end;
}
j = (int)len - s->init_num;
i = ssl2_read(s,(char *)&(p[s->init_num]),j);
if (i < j)
{
ret=ssl2_part_read(s,SSL_F_REQUEST_CERTIFICATE,i);
goto end;
}
if (s->msg_callback)
s->msg_callback(0, s->version, 0, p, len, s, s->msg_callback_arg); /* CLIENT-CERTIFICATE */
p += 6;
cp = p;
x509=(X509 *)d2i_X509(NULL,&cp,(long)s->s2->tmp.clen);
if (x509 == NULL)
{
SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_X509_LIB);
goto msg_end;
}
if (((sk=sk_X509_new_null()) == NULL) || (!sk_X509_push(sk,x509)))
{
SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
goto msg_end;
}
i=ssl_verify_cert_chain(s,sk);
if (i > 0) /* we like the packet, now check the chksum */
{
EVP_MD_CTX ctx;
EVP_PKEY *pkey=NULL;
EVP_MD_CTX_init(&ctx);
if (!EVP_VerifyInit_ex(&ctx,s->ctx->rsa_md5, NULL)
|| !EVP_VerifyUpdate(&ctx,s->s2->key_material,
s->s2->key_material_length)
|| !EVP_VerifyUpdate(&ctx,ccd,
SSL2_MIN_CERT_CHALLENGE_LENGTH))
goto msg_end;
i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,NULL);
buf2=OPENSSL_malloc((unsigned int)i);
if (buf2 == NULL)
{
SSLerr(SSL_F_REQUEST_CERTIFICATE,ERR_R_MALLOC_FAILURE);
goto msg_end;
}
p2=buf2;
i=i2d_X509(s->cert->pkeys[SSL_PKEY_RSA_ENC].x509,&p2);
if (!EVP_VerifyUpdate(&ctx,buf2,(unsigned int)i))
{
OPENSSL_free(buf2);
goto msg_end;
}
OPENSSL_free(buf2);
pkey=X509_get_pubkey(x509);
if (pkey == NULL) goto end;
i=EVP_VerifyFinal(&ctx,cp,s->s2->tmp.rlen,pkey);
EVP_PKEY_free(pkey);
EVP_MD_CTX_cleanup(&ctx);
if (i > 0)
{
if (s->session->peer != NULL)
X509_free(s->session->peer);
s->session->peer=x509;
CRYPTO_add(&x509->references,1,CRYPTO_LOCK_X509);
s->session->verify_result = s->verify_result;
ret=1;
goto end;
}
else
{
SSLerr(SSL_F_REQUEST_CERTIFICATE,SSL_R_BAD_CHECKSUM);
goto msg_end;
}
}
else
{
msg_end:
ssl2_return_error(s,SSL2_PE_BAD_CERTIFICATE);
}
end:
sk_X509_free(sk);
X509_free(x509);
return(ret);
}
static int ssl_rsa_private_decrypt(CERT *c, int len, unsigned char *from,
unsigned char *to, int padding)
{
RSA *rsa;
int i;
if ((c == NULL) || (c->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL))
{
SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_NO_PRIVATEKEY);
return(-1);
}
if (c->pkeys[SSL_PKEY_RSA_ENC].privatekey->type != EVP_PKEY_RSA)
{
SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,SSL_R_PUBLIC_KEY_IS_NOT_RSA);
return(-1);
}
rsa=c->pkeys[SSL_PKEY_RSA_ENC].privatekey->pkey.rsa;
/* we have the public key */
i=RSA_private_decrypt(len,from,to,rsa,padding);
if (i < 0)
SSLerr(SSL_F_SSL_RSA_PRIVATE_DECRYPT,ERR_R_RSA_LIB);
return(i);
}
#else /* !OPENSSL_NO_SSL2 */
# if PEDANTIC
static void *dummy=&dummy;
# endif
#endif
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