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openssl/ssl/s3_srvr.c
Dr. Stephen Henson a2f9200fba Initial TLS v1.2 client support. Include a default supported signature 
algorithms extension (including everything we support). Swicth to new
signature format where needed and relax ECC restrictions.

Not TLS v1.2 client certifcate support yet but client will handle case
where a certificate is requested and we don't have one.
2011-05-09 15:44:01 +00:00

3434 lines
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/* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
/* 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) 1998-2007 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).
*
*/
/* ====================================================================
* Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
*
* Portions of the attached software ("Contribution") are developed by
* SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
*
* The Contribution is licensed pursuant to the OpenSSL open source
* license provided above.
*
* ECC cipher suite support in OpenSSL originally written by
* Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
*
*/
/* ====================================================================
* Copyright 2005 Nokia. All rights reserved.
*
* The portions of the attached software ("Contribution") is developed by
* Nokia Corporation and is licensed pursuant to the OpenSSL open source
* license.
*
* The Contribution, originally written by Mika Kousa and Pasi Eronen of
* Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
* support (see RFC 4279) to OpenSSL.
*
* No patent licenses or other rights except those expressly stated in
* the OpenSSL open source license shall be deemed granted or received
* expressly, by implication, estoppel, or otherwise.
*
* No assurances are provided by Nokia that the Contribution does not
* infringe the patent or other intellectual property rights of any third
* party or that the license provides you with all the necessary rights
* to make use of the Contribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
* ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
* SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
* OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
* OTHERWISE.
*/
#define REUSE_CIPHER_BUG
#define NETSCAPE_HANG_BUG
#include <stdio.h>
#include <openssl/crypto.h>
#include "ssl_locl.h"
#include "kssl_lcl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/x509.h>
#ifndef OPENSSL_NO_DH
#include <openssl/dh.h>
#endif
#include <openssl/bn.h>
#ifndef OPENSSL_NO_KRB5
#include <openssl/krb5_asn.h>
#endif
#include <openssl/md5.h>
static const SSL_METHOD *ssl3_get_server_method(int ver);
static const SSL_METHOD *ssl3_get_server_method(int ver)
{
if (ver == SSL3_VERSION)
return(SSLv3_server_method());
else
return(NULL);
}
#ifndef OPENSSL_NO_SRP
static int SSL_check_srp_ext_ClientHello(SSL *s,int *ad)
{
int ret = SSL_ERROR_NONE;
*ad = SSL_AD_UNRECOGNIZED_NAME;
if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
(s->srp_ctx.TLS_ext_srp_username_callback != NULL))
{
if(s->srp_ctx.login == NULL)
{
/* There isn't any srp login extension !!! */
ret = SSL3_AL_WARNING;
*ad = SSL_AD_MISSING_SRP_USERNAME;
}
else
{
ret = SSL_srp_server_param_with_username(s,ad);
}
}
return ret;
}
#endif
IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
ssl3_accept,
ssl_undefined_function,
ssl3_get_server_method)
int ssl3_accept(SSL *s)
{
BUF_MEM *buf;
unsigned long alg_k,Time=(unsigned long)time(NULL);
void (*cb)(const SSL *ssl,int type,int val)=NULL;
int ret= -1;
int new_state,state,skip=0;
#ifndef OPENSSL_NO_SRP
int srp_no_username =0;
#endif
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;
/* 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_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
return(-1);
}
for (;;)
{
state=s->state;
switch (s->state)
{
case SSL_ST_RENEGOTIATE:
s->renegotiate=1;
/* s->state=SSL_ST_ACCEPT; */
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);
if ((s->version>>8) != 3)
{
SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
return -1;
}
s->type=SSL_ST_ACCEPT;
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;
}
if (!ssl3_setup_buffers(s))
{
ret= -1;
goto end;
}
s->init_num=0;
if (s->state != SSL_ST_RENEGOTIATE)
{
/* Ok, we now need to push on a buffering BIO so that
* the output is sent in a way that TCP likes :-)
*/
if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
ssl3_init_finished_mac(s);
s->state=SSL3_ST_SR_CLNT_HELLO_A;
s->ctx->stats.sess_accept++;
}
else if (!s->s3->send_connection_binding &&
!(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
{
/* Server attempting to renegotiate with
* client that doesn't support secure
* renegotiation.
*/
SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
ret = -1;
goto end;
}
else
{
/* s->state == SSL_ST_RENEGOTIATE,
* we will just send a HelloRequest */
s->ctx->stats.sess_accept_renegotiate++;
s->state=SSL3_ST_SW_HELLO_REQ_A;
}
break;
case SSL3_ST_SW_HELLO_REQ_A:
case SSL3_ST_SW_HELLO_REQ_B:
s->shutdown=0;
ret=ssl3_send_hello_request(s);
if (ret <= 0) goto end;
s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
s->state=SSL3_ST_SW_FLUSH;
s->init_num=0;
ssl3_init_finished_mac(s);
break;
case SSL3_ST_SW_HELLO_REQ_C:
s->state=SSL_ST_OK;
break;
case SSL3_ST_SR_CLNT_HELLO_A:
case SSL3_ST_SR_CLNT_HELLO_B:
case SSL3_ST_SR_CLNT_HELLO_C:
#ifndef OPENSSL_NO_SRP
case SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME:
#endif
s->shutdown=0;
ret=ssl3_get_client_hello(s);
if (ret <= 0) goto end;
#ifndef OPENSSL_NO_SRP
{
int extension_error = 0,al;
if ((al = SSL_check_srp_ext_ClientHello(s,&extension_error)) != SSL_ERROR_NONE)
{
ssl3_send_alert(s,al,extension_error);
if (extension_error == SSL_AD_MISSING_SRP_USERNAME)
{
if (srp_no_username) goto end;
ERR_clear_error();
srp_no_username = 1;
s->state=SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
if ((ret=BIO_flush(s->wbio)) <= 0) goto end;
s->init_num=0;
break;
}
ret = -1;
SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
goto end;
}
}
#endif
s->renegotiate = 2;
s->state=SSL3_ST_SW_SRVR_HELLO_A;
s->init_num=0;
break;
case SSL3_ST_SW_SRVR_HELLO_A:
case SSL3_ST_SW_SRVR_HELLO_B:
ret=ssl3_send_server_hello(s);
if (ret <= 0) goto end;
#ifndef OPENSSL_NO_TLSEXT
if (s->hit)
{
if (s->tlsext_ticket_expected)
s->state=SSL3_ST_SW_SESSION_TICKET_A;
else
s->state=SSL3_ST_SW_CHANGE_A;
}
#else
if (s->hit)
s->state=SSL3_ST_SW_CHANGE_A;
#endif
else
s->state=SSL3_ST_SW_CERT_A;
s->init_num=0;
break;
case SSL3_ST_SW_CERT_A:
case SSL3_ST_SW_CERT_B:
/* Check if it is anon DH or anon ECDH, */
/* normal PSK or KRB5 or SRP */
if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
&& !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
{
ret=ssl3_send_server_certificate(s);
if (ret <= 0) goto end;
#ifndef OPENSSL_NO_TLSEXT
if (s->tlsext_status_expected)
s->state=SSL3_ST_SW_CERT_STATUS_A;
else
s->state=SSL3_ST_SW_KEY_EXCH_A;
}
else
{
skip = 1;
s->state=SSL3_ST_SW_KEY_EXCH_A;
}
#else
}
else
skip=1;
s->state=SSL3_ST_SW_KEY_EXCH_A;
#endif
s->init_num=0;
break;
case SSL3_ST_SW_KEY_EXCH_A:
case SSL3_ST_SW_KEY_EXCH_B:
alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
/* clear this, it may get reset by
* send_server_key_exchange */
if ((s->options & SSL_OP_EPHEMERAL_RSA)
#ifndef OPENSSL_NO_KRB5
&& !(alg_k & SSL_kKRB5)
#endif /* OPENSSL_NO_KRB5 */
)
/* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
* even when forbidden by protocol specs
* (handshake may fail as clients are not required to
* be able to handle this) */
s->s3->tmp.use_rsa_tmp=1;
else
s->s3->tmp.use_rsa_tmp=0;
/* only send if a DH key exchange, fortezza or
* RSA but we have a sign only certificate
*
* PSK: may send PSK identity hints
*
* For ECC ciphersuites, we send a serverKeyExchange
* message only if the cipher suite is either
* ECDH-anon or ECDHE. In other cases, the
* server certificate contains the server's
* public key for key exchange.
*/
if (s->s3->tmp.use_rsa_tmp
/* PSK: send ServerKeyExchange if PSK identity
* hint if provided */
#ifndef OPENSSL_NO_PSK
|| ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
#endif
#ifndef OPENSSL_NO_SRP
/* SRP: send ServerKeyExchange */
|| (alg_k & SSL_kSRP)
#endif
|| (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
|| (alg_k & SSL_kEECDH)
|| ((alg_k & SSL_kRSA)
&& (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
|| (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
&& EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
)
)
)
)
{
ret=ssl3_send_server_key_exchange(s);
if (ret <= 0) goto end;
}
else
skip=1;
s->state=SSL3_ST_SW_CERT_REQ_A;
s->init_num=0;
break;
case SSL3_ST_SW_CERT_REQ_A:
case SSL3_ST_SW_CERT_REQ_B:
if (/* don't request cert unless asked for it: */
!(s->verify_mode & SSL_VERIFY_PEER) ||
/* if SSL_VERIFY_CLIENT_ONCE is set,
* don't request cert during re-negotiation: */
((s->session->peer != NULL) &&
(s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
/* never request cert in anonymous ciphersuites
* (see section "Certificate request" in SSL 3 drafts
* and in RFC 2246): */
((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
/* ... except when the application insists on verification
* (against the specs, but s3_clnt.c accepts this for SSL 3) */
!(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
/* never request cert in Kerberos ciphersuites */
(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
/* With normal PSK Certificates and
* Certificate Requests are omitted */
|| (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
{
/* no cert request */
skip=1;
s->s3->tmp.cert_request=0;
s->state=SSL3_ST_SW_SRVR_DONE_A;
}
else
{
s->s3->tmp.cert_request=1;
ret=ssl3_send_certificate_request(s);
if (ret <= 0) goto end;
#ifndef NETSCAPE_HANG_BUG
s->state=SSL3_ST_SW_SRVR_DONE_A;
#else
s->state=SSL3_ST_SW_FLUSH;
s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
#endif
s->init_num=0;
}
break;
case SSL3_ST_SW_SRVR_DONE_A:
case SSL3_ST_SW_SRVR_DONE_B:
ret=ssl3_send_server_done(s);
if (ret <= 0) goto end;
s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
s->state=SSL3_ST_SW_FLUSH;
s->init_num=0;
break;
case SSL3_ST_SW_FLUSH:
/* This code originally checked to see if
* any data was pending using BIO_CTRL_INFO
* and then flushed. This caused problems
* as documented in PR#1939. The proposed
* fix doesn't completely resolve this issue
* as buggy implementations of BIO_CTRL_PENDING
* still exist. So instead we just flush
* unconditionally.
*/
s->rwstate=SSL_WRITING;
if (BIO_flush(s->wbio) <= 0)
{
ret= -1;
goto end;
}
s->rwstate=SSL_NOTHING;
s->state=s->s3->tmp.next_state;
break;
case SSL3_ST_SR_CERT_A:
case SSL3_ST_SR_CERT_B:
/* Check for second client hello (MS SGC) */
ret = ssl3_check_client_hello(s);
if (ret <= 0)
goto end;
if (ret == 2)
s->state = SSL3_ST_SR_CLNT_HELLO_C;
else {
if (s->s3->tmp.cert_request)
{
ret=ssl3_get_client_certificate(s);
if (ret <= 0) goto end;
}
s->init_num=0;
s->state=SSL3_ST_SR_KEY_EXCH_A;
}
break;
case SSL3_ST_SR_KEY_EXCH_A:
case SSL3_ST_SR_KEY_EXCH_B:
ret=ssl3_get_client_key_exchange(s);
if (ret <= 0)
goto end;
if (ret == 2)
{
/* For the ECDH ciphersuites when
* the client sends its ECDH pub key in
* a certificate, the CertificateVerify
* message is not sent.
* Also for GOST ciphersuites when
* the client uses its key from the certificate
* for key exchange.
*/
#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
s->state=SSL3_ST_SR_FINISHED_A;
#else
if (s->s3->next_proto_neg_seen)
s->state=SSL3_ST_SR_NEXT_PROTO_A;
else
s->state=SSL3_ST_SR_FINISHED_A;
#endif
s->init_num = 0;
}
else
{
int offset=0;
int dgst_num;
s->state=SSL3_ST_SR_CERT_VRFY_A;
s->init_num=0;
/* We need to get hashes here so if there is
* a client cert, it can be verified
* FIXME - digest processing for CertificateVerify
* should be generalized. But it is next step
*/
if (s->s3->handshake_buffer)
if (!ssl3_digest_cached_records(s))
return -1;
for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
if (s->s3->handshake_dgst[dgst_num])
{
int dgst_size;
s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
if (dgst_size < 0)
{
ret = -1;
goto end;
}
offset+=dgst_size;
}
}
break;
case SSL3_ST_SR_CERT_VRFY_A:
case SSL3_ST_SR_CERT_VRFY_B:
/* we should decide if we expected this one */
ret=ssl3_get_cert_verify(s);
if (ret <= 0) goto end;
#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
s->state=SSL3_ST_SR_FINISHED_A;
#else
if (s->s3->next_proto_neg_seen)
s->state=SSL3_ST_SR_NEXT_PROTO_A;
else
s->state=SSL3_ST_SR_FINISHED_A;
#endif
s->init_num=0;
break;
#if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
case SSL3_ST_SR_NEXT_PROTO_A:
case SSL3_ST_SR_NEXT_PROTO_B:
ret=ssl3_get_next_proto(s);
if (ret <= 0) goto end;
s->init_num = 0;
s->state=SSL3_ST_SR_FINISHED_A;
break;
#endif
case SSL3_ST_SR_FINISHED_A:
case SSL3_ST_SR_FINISHED_B:
ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
SSL3_ST_SR_FINISHED_B);
if (ret <= 0) goto end;
#ifndef OPENSSL_NO_TLSEXT
if (s->tlsext_ticket_expected)
s->state=SSL3_ST_SW_SESSION_TICKET_A;
else if (s->hit)
s->state=SSL_ST_OK;
#else
if (s->hit)
s->state=SSL_ST_OK;
#endif
else
s->state=SSL3_ST_SW_CHANGE_A;
s->init_num=0;
break;
#ifndef OPENSSL_NO_TLSEXT
case SSL3_ST_SW_SESSION_TICKET_A:
case SSL3_ST_SW_SESSION_TICKET_B:
ret=ssl3_send_newsession_ticket(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_SW_CHANGE_A;
s->init_num=0;
break;
case SSL3_ST_SW_CERT_STATUS_A:
case SSL3_ST_SW_CERT_STATUS_B:
ret=ssl3_send_cert_status(s);
if (ret <= 0) goto end;
s->state=SSL3_ST_SW_KEY_EXCH_A;
s->init_num=0;
break;
#endif
case SSL3_ST_SW_CHANGE_A:
case SSL3_ST_SW_CHANGE_B:
s->session->cipher=s->s3->tmp.new_cipher;
if (!s->method->ssl3_enc->setup_key_block(s))
{ ret= -1; goto end; }
ret=ssl3_send_change_cipher_spec(s,
SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
if (ret <= 0) goto end;
s->state=SSL3_ST_SW_FINISHED_A;
s->init_num=0;
if (!s->method->ssl3_enc->change_cipher_state(s,
SSL3_CHANGE_CIPHER_SERVER_WRITE))
{
ret= -1;
goto end;
}
break;
case SSL3_ST_SW_FINISHED_A:
case SSL3_ST_SW_FINISHED_B:
ret=ssl3_send_finished(s,
SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
s->method->ssl3_enc->server_finished_label,
s->method->ssl3_enc->server_finished_label_len);
if (ret <= 0) goto end;
s->state=SSL3_ST_SW_FLUSH;
if (s->hit)
{
#if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
#else
if (s->s3->next_proto_neg_seen)
s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
else
s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
#endif
}
else
s->s3->tmp.next_state=SSL_ST_OK;
s->init_num=0;
break;
case SSL_ST_OK:
/* clean a few things up */
ssl3_cleanup_key_block(s);
BUF_MEM_free(s->init_buf);
s->init_buf=NULL;
/* remove buffering on output */
ssl_free_wbio_buffer(s);
s->init_num=0;
if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
{
/* actually not necessarily a 'new' session unless
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
s->renegotiate=0;
s->new_session=0;
ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
s->ctx->stats.sess_accept_good++;
/* s->server=1; */
s->handshake_func=ssl3_accept;
if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
}
ret = 1;
goto end;
/* break; */
default:
SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
ret= -1;
goto end;
/* break; */
}
if (!s->s3->tmp.reuse_message && !skip)
{
if (s->debug)
{
if ((ret=BIO_flush(s->wbio)) <= 0)
goto end;
}
if ((cb != NULL) && (s->state != state))
{
new_state=s->state;
s->state=state;
cb(s,SSL_CB_ACCEPT_LOOP,1);
s->state=new_state;
}
}
skip=0;
}
end:
/* BIO_flush(s->wbio); */
s->in_handshake--;
if (cb != NULL)
cb(s,SSL_CB_ACCEPT_EXIT,ret);
return(ret);
}
int ssl3_send_hello_request(SSL *s)
{
unsigned char *p;
if (s->state == SSL3_ST_SW_HELLO_REQ_A)
{
p=(unsigned char *)s->init_buf->data;
*(p++)=SSL3_MT_HELLO_REQUEST;
*(p++)=0;
*(p++)=0;
*(p++)=0;
s->state=SSL3_ST_SW_HELLO_REQ_B;
/* number of bytes to write */
s->init_num=4;
s->init_off=0;
}
/* SSL3_ST_SW_HELLO_REQ_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
}
int ssl3_check_client_hello(SSL *s)
{
int ok;
long n;
/* this function is called when we really expect a Certificate message,
* so permit appropriate message length */
n=s->method->ssl_get_message(s,
SSL3_ST_SR_CERT_A,
SSL3_ST_SR_CERT_B,
-1,
s->max_cert_list,
&ok);
if (!ok) return((int)n);
s->s3->tmp.reuse_message = 1;
if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
{
/* Throw away what we have done so far in the current handshake,
* which will now be aborted. (A full SSL_clear would be too much.)
* I hope that tmp.dh is the only thing that may need to be cleared
* when a handshake is not completed ... */
#ifndef OPENSSL_NO_DH
if (s->s3->tmp.dh != NULL)
{
DH_free(s->s3->tmp.dh);
s->s3->tmp.dh = NULL;
}
#endif
return 2;
}
return 1;
}
int ssl3_get_client_hello(SSL *s)
{
int i,j,ok,al,ret= -1;
unsigned int cookie_len;
long n;
unsigned long id;
unsigned char *p,*d,*q;
SSL_CIPHER *c;
#ifndef OPENSSL_NO_COMP
SSL_COMP *comp=NULL;
#endif
STACK_OF(SSL_CIPHER) *ciphers=NULL;
/* We do this so that we will respond with our native type.
* If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
* This down switching should be handled by a different method.
* If we are SSLv3, we will respond with SSLv3, even if prompted with
* TLSv1.
*/
if (s->state == SSL3_ST_SR_CLNT_HELLO_A
#ifndef OPENSSL_NO_SRP
|| (s->state == SSL3_ST_SR_CLNT_HELLO_SRP_USERNAME)
#endif
)
{
s->state=SSL3_ST_SR_CLNT_HELLO_B;
}
s->first_packet=1;
n=s->method->ssl_get_message(s,
SSL3_ST_SR_CLNT_HELLO_B,
SSL3_ST_SR_CLNT_HELLO_C,
SSL3_MT_CLIENT_HELLO,
SSL3_RT_MAX_PLAIN_LENGTH,
&ok);
if (!ok) return((int)n);
s->first_packet=0;
d=p=(unsigned char *)s->init_msg;
/* use version from inside client hello, not from record header
* (may differ: see RFC 2246, Appendix E, second paragraph) */
s->client_version=(((int)p[0])<<8)|(int)p[1];
p+=2;
if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
(s->version != DTLS1_VERSION && s->client_version < s->version))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
{
/* similar to ssl3_get_record, send alert using remote version number */
s->version = s->client_version;
}
al = SSL_AD_PROTOCOL_VERSION;
goto f_err;
}
/* If we require cookies and this ClientHello doesn't
* contain one, just return since we do not want to
* allocate any memory yet. So check cookie length...
*/
if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
{
unsigned int session_length, cookie_length;
session_length = *(p + SSL3_RANDOM_SIZE);
cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
if (cookie_length == 0)
return 1;
}
/* load the client random */
memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
/* get the session-id */
j= *(p++);
s->hit=0;
/* Versions before 0.9.7 always allow session reuse during renegotiation
* (i.e. when s->new_session is true), option
* SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
* Maybe this optional behaviour should always have been the default,
* but we cannot safely change the default behaviour (or new applications
* might be written that become totally unsecure when compiled with
* an earlier library version)
*/
if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
{
if (!ssl_get_new_session(s,1))
goto err;
}
else
{
i=ssl_get_prev_session(s, p, j, d + n);
if (i == 1)
{ /* previous session */
s->hit=1;
}
else if (i == -1)
goto err;
else /* i == 0 */
{
if (!ssl_get_new_session(s,1))
goto err;
}
}
p+=j;
if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
{
/* cookie stuff */
cookie_len = *(p++);
/*
* The ClientHello may contain a cookie even if the
* HelloVerify message has not been sent--make sure that it
* does not cause an overflow.
*/
if ( cookie_len > sizeof(s->d1->rcvd_cookie))
{
/* too much data */
al = SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
goto f_err;
}
/* verify the cookie if appropriate option is set. */
if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
cookie_len > 0)
{
memcpy(s->d1->rcvd_cookie, p, cookie_len);
if ( s->ctx->app_verify_cookie_cb != NULL)
{
if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
cookie_len) == 0)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
SSL_R_COOKIE_MISMATCH);
goto f_err;
}
/* else cookie verification succeeded */
}
else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
s->d1->cookie_len) != 0) /* default verification */
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
SSL_R_COOKIE_MISMATCH);
goto f_err;
}
ret = 2;
}
p += cookie_len;
}
n2s(p,i);
if ((i == 0) && (j != 0))
{
/* we need a cipher if we are not resuming a session */
al=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
goto f_err;
}
if ((p+i) >= (d+n))
{
/* not enough data */
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
goto f_err;
}
if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
== NULL))
{
goto err;
}
p+=i;
/* If it is a hit, check that the cipher is in the list */
if ((s->hit) && (i > 0))
{
j=0;
id=s->session->cipher->id;
#ifdef CIPHER_DEBUG
printf("client sent %d ciphers\n",sk_num(ciphers));
#endif
for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
{
c=sk_SSL_CIPHER_value(ciphers,i);
#ifdef CIPHER_DEBUG
printf("client [%2d of %2d]:%s\n",
i,sk_num(ciphers),SSL_CIPHER_get_name(c));
#endif
if (c->id == id)
{
j=1;
break;
}
}
/* Disabled because it can be used in a ciphersuite downgrade
* attack: CVE-2010-4180.
*/
#if 0
if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
{
/* Special case as client bug workaround: the previously used cipher may
* not be in the current list, the client instead might be trying to
* continue using a cipher that before wasn't chosen due to server
* preferences. We'll have to reject the connection if the cipher is not
* enabled, though. */
c = sk_SSL_CIPHER_value(ciphers, 0);
if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
{
s->session->cipher = c;
j = 1;
}
}
#endif
if (j == 0)
{
/* we need to have the cipher in the cipher
* list if we are asked to reuse it */
al=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
goto f_err;
}
}
/* compression */
i= *(p++);
if ((p+i) > (d+n))
{
/* not enough data */
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
goto f_err;
}
q=p;
for (j=0; j<i; j++)
{
if (p[j] == 0) break;
}
p+=i;
if (j >= i)
{
/* no compress */
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
goto f_err;
}
#ifndef OPENSSL_NO_TLSEXT
/* TLS extensions*/
if (s->version >= SSL3_VERSION)
{
if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
{
/* 'al' set by ssl_parse_clienthello_tlsext */
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
goto f_err;
}
}
if (ssl_check_clienthello_tlsext(s) <= 0) {
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
goto err;
}
/* Check if we want to use external pre-shared secret for this
* handshake for not reused session only. We need to generate
* server_random before calling tls_session_secret_cb in order to allow
* SessionTicket processing to use it in key derivation. */
{
unsigned long Time;
unsigned char *pos;
Time=(unsigned long)time(NULL); /* Time */
pos=s->s3->server_random;
l2n(Time,pos);
if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
{
al=SSL_AD_INTERNAL_ERROR;
goto f_err;
}
}
if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
{
SSL_CIPHER *pref_cipher=NULL;
s->session->master_key_length=sizeof(s->session->master_key);
if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
{
s->hit=1;
s->session->ciphers=ciphers;
s->session->verify_result=X509_V_OK;
ciphers=NULL;
/* check if some cipher was preferred by call back */
pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
if (pref_cipher == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
goto f_err;
}
s->session->cipher=pref_cipher;
if (s->cipher_list)
sk_SSL_CIPHER_free(s->cipher_list);
if (s->cipher_list_by_id)
sk_SSL_CIPHER_free(s->cipher_list_by_id);
s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
}
}
#endif
/* Worst case, we will use the NULL compression, but if we have other
* options, we will now look for them. We have i-1 compression
* algorithms from the client, starting at q. */
s->s3->tmp.new_compression=NULL;
#ifndef OPENSSL_NO_COMP
/* This only happens if we have a cache hit */
if (s->session->compress_meth != 0)
{
int m, comp_id = s->session->compress_meth;
/* Perform sanity checks on resumed compression algorithm */
/* Can't disable compression */
if (s->options & SSL_OP_NO_COMPRESSION)
{
al=SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
goto f_err;
}
/* Look for resumed compression method */
for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
{
comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
if (comp_id == comp->id)
{
s->s3->tmp.new_compression=comp;
break;
}
}
if (s->s3->tmp.new_compression == NULL)
{
al=SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
goto f_err;
}
/* Look for resumed method in compression list */
for (m = 0; m < i; m++)
{
if (q[m] == comp_id)
break;
}
if (m >= i)
{
al=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
goto f_err;
}
}
else if (s->hit)
comp = NULL;
else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
{ /* See if we have a match */
int m,nn,o,v,done=0;
nn=sk_SSL_COMP_num(s->ctx->comp_methods);
for (m=0; m<nn; m++)
{
comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
v=comp->id;
for (o=0; o<i; o++)
{
if (v == q[o])
{
done=1;
break;
}
}
if (done) break;
}
if (done)
s->s3->tmp.new_compression=comp;
else
comp=NULL;
}
#else
/* If compression is disabled we'd better not try to resume a session
* using compression.
*/
if (s->session->compress_meth != 0)
{
al=SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
goto f_err;
}
#endif
/* Given s->session->ciphers and SSL_get_ciphers, we must
* pick a cipher */
if (!s->hit)
{
#ifdef OPENSSL_NO_COMP
s->session->compress_meth=0;
#else
s->session->compress_meth=(comp == NULL)?0:comp->id;
#endif
if (s->session->ciphers != NULL)
sk_SSL_CIPHER_free(s->session->ciphers);
s->session->ciphers=ciphers;
if (ciphers == NULL)
{
al=SSL_AD_ILLEGAL_PARAMETER;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
goto f_err;
}
ciphers=NULL;
c=ssl3_choose_cipher(s,s->session->ciphers,
SSL_get_ciphers(s));
if (c == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
goto f_err;
}
s->s3->tmp.new_cipher=c;
/* check whether we should disable session resumption */
if (s->not_resumable_session_cb != NULL)
s->session->not_resumable=s->not_resumable_session_cb(s,
((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
if (s->session->not_resumable)
/* do not send a session ticket */
s->tlsext_ticket_expected = 0;
}
else
{
/* Session-id reuse */
#ifdef REUSE_CIPHER_BUG
STACK_OF(SSL_CIPHER) *sk;
SSL_CIPHER *nc=NULL;
SSL_CIPHER *ec=NULL;
if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
{
sk=s->session->ciphers;
for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
{
c=sk_SSL_CIPHER_value(sk,i);
if (c->algorithm_enc & SSL_eNULL)
nc=c;
if (SSL_C_IS_EXPORT(c))
ec=c;
}
if (nc != NULL)
s->s3->tmp.new_cipher=nc;
else if (ec != NULL)
s->s3->tmp.new_cipher=ec;
else
s->s3->tmp.new_cipher=s->session->cipher;
}
else
#endif
s->s3->tmp.new_cipher=s->session->cipher;
}
if (!ssl3_digest_cached_records(s))
goto f_err;
/* we now have the following setup.
* client_random
* cipher_list - our prefered list of ciphers
* ciphers - the clients prefered list of ciphers
* compression - basically ignored right now
* ssl version is set - sslv3
* s->session - The ssl session has been setup.
* s->hit - session reuse flag
* s->tmp.new_cipher - the new cipher to use.
*/
if (ret < 0) ret=1;
if (0)
{
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
}
err:
if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
return(ret);
}
int ssl3_send_server_hello(SSL *s)
{
unsigned char *buf;
unsigned char *p,*d;
int i,sl;
unsigned long l;
#ifdef OPENSSL_NO_TLSEXT
unsigned long Time;
#endif
if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
{
buf=(unsigned char *)s->init_buf->data;
#ifdef OPENSSL_NO_TLSEXT
p=s->s3->server_random;
/* Generate server_random if it was not needed previously */
Time=(unsigned long)time(NULL); /* Time */
l2n(Time,p);
if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
return -1;
#endif
/* Do the message type and length last */
d=p= &(buf[4]);
*(p++)=s->version>>8;
*(p++)=s->version&0xff;
/* Random stuff */
memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
p+=SSL3_RANDOM_SIZE;
/* now in theory we have 3 options to sending back the
* session id. If it is a re-use, we send back the
* old session-id, if it is a new session, we send
* back the new session-id or we send back a 0 length
* session-id if we want it to be single use.
* Currently I will not implement the '0' length session-id
* 12-Jan-98 - I'll now support the '0' length stuff.
*
* We also have an additional case where stateless session
* resumption is successful: we always send back the old
* session id. In this case s->hit is non zero: this can
* only happen if stateless session resumption is succesful
* if session caching is disabled so existing functionality
* is unaffected.
*/
if (s->session->not_resumable ||
(!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
&& !s->hit))
s->session->session_id_length=0;
sl=s->session->session_id_length;
if (sl > (int)sizeof(s->session->session_id))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
return -1;
}
*(p++)=sl;
memcpy(p,s->session->session_id,sl);
p+=sl;
/* put the cipher */
i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
p+=i;
/* put the compression method */
#ifdef OPENSSL_NO_COMP
*(p++)=0;
#else
if (s->s3->tmp.new_compression == NULL)
*(p++)=0;
else
*(p++)=s->s3->tmp.new_compression->id;
#endif
#ifndef OPENSSL_NO_TLSEXT
if (ssl_prepare_serverhello_tlsext(s) <= 0)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
return -1;
}
if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
return -1;
}
#endif
/* do the header */
l=(p-d);
d=buf;
*(d++)=SSL3_MT_SERVER_HELLO;
l2n3(l,d);
s->state=SSL3_ST_SW_SRVR_HELLO_B;
/* number of bytes to write */
s->init_num=p-buf;
s->init_off=0;
}
/* SSL3_ST_SW_SRVR_HELLO_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
}
int ssl3_send_server_done(SSL *s)
{
unsigned char *p;
if (s->state == SSL3_ST_SW_SRVR_DONE_A)
{
p=(unsigned char *)s->init_buf->data;
/* do the header */
*(p++)=SSL3_MT_SERVER_DONE;
*(p++)=0;
*(p++)=0;
*(p++)=0;
s->state=SSL3_ST_SW_SRVR_DONE_B;
/* number of bytes to write */
s->init_num=4;
s->init_off=0;
}
/* SSL3_ST_SW_SRVR_DONE_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
}
int ssl3_send_server_key_exchange(SSL *s)
{
#ifndef OPENSSL_NO_RSA
unsigned char *q;
int j,num;
RSA *rsa;
unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
unsigned int u;
#endif
#ifndef OPENSSL_NO_DH
DH *dh=NULL,*dhp;
#endif
#ifndef OPENSSL_NO_ECDH
EC_KEY *ecdh=NULL, *ecdhp;
unsigned char *encodedPoint = NULL;
int encodedlen = 0;
int curve_id = 0;
BN_CTX *bn_ctx = NULL;
#endif
EVP_PKEY *pkey;
const EVP_MD *md = NULL;
unsigned char *p,*d;
int al,i;
unsigned long type;
int n;
CERT *cert;
BIGNUM *r[4];
int nr[4],kn;
BUF_MEM *buf;
EVP_MD_CTX md_ctx;
EVP_MD_CTX_init(&md_ctx);
if (s->state == SSL3_ST_SW_KEY_EXCH_A)
{
type=s->s3->tmp.new_cipher->algorithm_mkey;
cert=s->cert;
buf=s->init_buf;
r[0]=r[1]=r[2]=r[3]=NULL;
n=0;
#ifndef OPENSSL_NO_RSA
if (type & SSL_kRSA)
{
rsa=cert->rsa_tmp;
if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
{
rsa=s->cert->rsa_tmp_cb(s,
SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
if(rsa == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
goto f_err;
}
RSA_up_ref(rsa);
cert->rsa_tmp=rsa;
}
if (rsa == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
goto f_err;
}
r[0]=rsa->n;
r[1]=rsa->e;
s->s3->tmp.use_rsa_tmp=1;
}
else
#endif
#ifndef OPENSSL_NO_DH
if (type & SSL_kEDH)
{
dhp=cert->dh_tmp;
if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
dhp=s->cert->dh_tmp_cb(s,
SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
if (dhp == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
goto f_err;
}
if (s->s3->tmp.dh != NULL)
{
DH_free(dh);
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
goto err;
}
if ((dh=DHparams_dup(dhp)) == NULL)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
s->s3->tmp.dh=dh;
if ((dhp->pub_key == NULL ||
dhp->priv_key == NULL ||
(s->options & SSL_OP_SINGLE_DH_USE)))
{
if(!DH_generate_key(dh))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
ERR_R_DH_LIB);
goto err;
}
}
else
{
dh->pub_key=BN_dup(dhp->pub_key);
dh->priv_key=BN_dup(dhp->priv_key);
if ((dh->pub_key == NULL) ||
(dh->priv_key == NULL))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
}
r[0]=dh->p;
r[1]=dh->g;
r[2]=dh->pub_key;
}
else
#endif
#ifndef OPENSSL_NO_ECDH
if (type & SSL_kEECDH)
{
const EC_GROUP *group;
ecdhp=cert->ecdh_tmp;
if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
{
ecdhp=s->cert->ecdh_tmp_cb(s,
SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
}
if (ecdhp == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
goto f_err;
}
if (s->s3->tmp.ecdh != NULL)
{
EC_KEY_free(s->s3->tmp.ecdh);
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
goto err;
}
/* Duplicate the ECDH structure. */
if (ecdhp == NULL)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
goto err;
}
if (!EC_KEY_up_ref(ecdhp))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
goto err;
}
ecdh = ecdhp;
s->s3->tmp.ecdh=ecdh;
if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
(EC_KEY_get0_private_key(ecdh) == NULL) ||
(s->options & SSL_OP_SINGLE_ECDH_USE))
{
if(!EC_KEY_generate_key(ecdh))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
goto err;
}
}
if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
(EC_KEY_get0_public_key(ecdh) == NULL) ||
(EC_KEY_get0_private_key(ecdh) == NULL))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
goto err;
}
if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
(EC_GROUP_get_degree(group) > 163))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
goto err;
}
/* XXX: For now, we only support ephemeral ECDH
* keys over named (not generic) curves. For
* supported named curves, curve_id is non-zero.
*/
if ((curve_id =
tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
== 0)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
goto err;
}
/* Encode the public key.
* First check the size of encoding and
* allocate memory accordingly.
*/
encodedlen = EC_POINT_point2oct(group,
EC_KEY_get0_public_key(ecdh),
POINT_CONVERSION_UNCOMPRESSED,
NULL, 0, NULL);
encodedPoint = (unsigned char *)
OPENSSL_malloc(encodedlen*sizeof(unsigned char));
bn_ctx = BN_CTX_new();
if ((encodedPoint == NULL) || (bn_ctx == NULL))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
goto err;
}
encodedlen = EC_POINT_point2oct(group,
EC_KEY_get0_public_key(ecdh),
POINT_CONVERSION_UNCOMPRESSED,
encodedPoint, encodedlen, bn_ctx);
if (encodedlen == 0)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
goto err;
}
BN_CTX_free(bn_ctx); bn_ctx=NULL;
/* XXX: For now, we only support named (not
* generic) curves in ECDH ephemeral key exchanges.
* In this situation, we need four additional bytes
* to encode the entire ServerECDHParams
* structure.
*/
n = 4 + encodedlen;
/* We'll generate the serverKeyExchange message
* explicitly so we can set these to NULLs
*/
r[0]=NULL;
r[1]=NULL;
r[2]=NULL;
r[3]=NULL;
}
else
#endif /* !OPENSSL_NO_ECDH */
#ifndef OPENSSL_NO_PSK
if (type & SSL_kPSK)
{
/* reserve size for record length and PSK identity hint*/
n+=2+strlen(s->ctx->psk_identity_hint);
}
else
#endif /* !OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_SRP
if (type & SSL_kSRP)
{
if ((s->srp_ctx.N == NULL) ||
(s->srp_ctx.g == NULL) ||
(s->srp_ctx.s == NULL) ||
(s->srp_ctx.B == NULL))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
goto err;
}
r[0]=s->srp_ctx.N;
r[1]=s->srp_ctx.g;
r[2]=s->srp_ctx.s;
r[3]=s->srp_ctx.B;
}
else
#endif
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
goto f_err;
}
for (i=0; r[i] != NULL && i<4; i++)
{
nr[i]=BN_num_bytes(r[i]);
#ifndef OPENSSL_NO_SRP
if ((i == 2) && (type & SSL_kSRP))
n+=1+nr[i];
else
#endif
n+=2+nr[i];
}
if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
{
if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
== NULL)
{
al=SSL_AD_DECODE_ERROR;
goto f_err;
}
kn=EVP_PKEY_size(pkey);
}
else
{
pkey=NULL;
kn=0;
}
if (!BUF_MEM_grow_clean(buf,n+4+kn))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
goto err;
}
d=(unsigned char *)s->init_buf->data;
p= &(d[4]);
for (i=0; r[i] != NULL && i<4; i++)
{
#ifndef OPENSSL_NO_SRP
if ((i == 2) && (type & SSL_kSRP))
{
*p = nr[i];
p++;
}
else
#endif
s2n(nr[i],p);
BN_bn2bin(r[i],p);
p+=nr[i];
}
#ifndef OPENSSL_NO_ECDH
if (type & SSL_kEECDH)
{
/* XXX: For now, we only support named (not generic) curves.
* In this situation, the serverKeyExchange message has:
* [1 byte CurveType], [2 byte CurveName]
* [1 byte length of encoded point], followed by
* the actual encoded point itself
*/
*p = NAMED_CURVE_TYPE;
p += 1;
*p = 0;
p += 1;
*p = curve_id;
p += 1;
*p = encodedlen;
p += 1;
memcpy((unsigned char*)p,
(unsigned char *)encodedPoint,
encodedlen);
OPENSSL_free(encodedPoint);
p += encodedlen;
}
#endif
#ifndef OPENSSL_NO_PSK
if (type & SSL_kPSK)
{
/* copy PSK identity hint */
s2n(strlen(s->ctx->psk_identity_hint), p);
strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
p+=strlen(s->ctx->psk_identity_hint);
}
#endif
/* not anonymous */
if (pkey != NULL)
{
/* n is the length of the params, they start at &(d[4])
* and p points to the space at the end. */
#ifndef OPENSSL_NO_RSA
if (pkey->type == EVP_PKEY_RSA
&& s->version < TLS1_2_VERSION)
{
q=md_buf;
j=0;
for (num=2; num > 0; num--)
{
EVP_DigestInit_ex(&md_ctx,(num == 2)
?s->ctx->md5:s->ctx->sha1, NULL);
EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
EVP_DigestUpdate(&md_ctx,&(d[4]),n);
EVP_DigestFinal_ex(&md_ctx,q,
(unsigned int *)&i);
q+=i;
j+=i;
}
if (RSA_sign(NID_md5_sha1, md_buf, j,
&(p[2]), &u, pkey->pkey.rsa) <= 0)
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
goto err;
}
s2n(u,p);
n+=u+2;
}
else
#endif
if (md)
{
/* For TLS1.2 and later send signature
* algorithm */
if (s->version >= TLS1_2_VERSION)
{
if (!tls12_get_sigandhash(p, pkey, md))
{
/* Should never happen */
al=SSL_AD_INTERNAL_ERROR;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
goto f_err;
}
p+=2;
}
#ifdef SSL_DEBUG
fprintf(stderr, "Using hash %s\n",
EVP_MD_name(md));
#endif
EVP_SignInit_ex(&md_ctx, md, NULL);
EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
EVP_SignUpdate(&md_ctx,&(d[4]),n);
if (!EVP_SignFinal(&md_ctx,&(p[2]),
(unsigned int *)&i,pkey))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
goto err;
}
s2n(i,p);
n+=i+2;
if (s->version >= TLS1_2_VERSION)
n+= 2;
}
else
{
/* Is this error check actually needed? */
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
goto f_err;
}
}
*(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
l2n3(n,d);
/* we should now have things packed up, so lets send
* it off */
s->init_num=n+4;
s->init_off=0;
}
s->state = SSL3_ST_SW_KEY_EXCH_B;
EVP_MD_CTX_cleanup(&md_ctx);
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
err:
#ifndef OPENSSL_NO_ECDH
if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
BN_CTX_free(bn_ctx);
#endif
EVP_MD_CTX_cleanup(&md_ctx);
return(-1);
}
int ssl3_send_certificate_request(SSL *s)
{
unsigned char *p,*d;
int i,j,nl,off,n;
STACK_OF(X509_NAME) *sk=NULL;
X509_NAME *name;
BUF_MEM *buf;
if (s->state == SSL3_ST_SW_CERT_REQ_A)
{
buf=s->init_buf;
d=p=(unsigned char *)&(buf->data[4]);
/* get the list of acceptable cert types */
p++;
n=ssl3_get_req_cert_type(s,p);
d[0]=n;
p+=n;
n++;
off=n;
p+=2;
n+=2;
sk=SSL_get_client_CA_list(s);
nl=0;
if (sk != NULL)
{
for (i=0; i<sk_X509_NAME_num(sk); i++)
{
name=sk_X509_NAME_value(sk,i);
j=i2d_X509_NAME(name,NULL);
if (!BUF_MEM_grow_clean(buf,4+n+j+2))
{
SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
goto err;
}
p=(unsigned char *)&(buf->data[4+n]);
if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
{
s2n(j,p);
i2d_X509_NAME(name,&p);
n+=2+j;
nl+=2+j;
}
else
{
d=p;
i2d_X509_NAME(name,&p);
j-=2; s2n(j,d); j+=2;
n+=j;
nl+=j;
}
}
}
/* else no CA names */
p=(unsigned char *)&(buf->data[4+off]);
s2n(nl,p);
d=(unsigned char *)buf->data;
*(d++)=SSL3_MT_CERTIFICATE_REQUEST;
l2n3(n,d);
/* we should now have things packed up, so lets send
* it off */
s->init_num=n+4;
s->init_off=0;
#ifdef NETSCAPE_HANG_BUG
p=(unsigned char *)s->init_buf->data + s->init_num;
/* do the header */
*(p++)=SSL3_MT_SERVER_DONE;
*(p++)=0;
*(p++)=0;
*(p++)=0;
s->init_num += 4;
#endif
s->state = SSL3_ST_SW_CERT_REQ_B;
}
/* SSL3_ST_SW_CERT_REQ_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
err:
return(-1);
}
int ssl3_get_client_key_exchange(SSL *s)
{
int i,al,ok;
long n;
unsigned long alg_k;
unsigned char *p;
#ifndef OPENSSL_NO_RSA
RSA *rsa=NULL;
EVP_PKEY *pkey=NULL;
#endif
#ifndef OPENSSL_NO_DH
BIGNUM *pub=NULL;
DH *dh_srvr;
#endif
#ifndef OPENSSL_NO_KRB5
KSSL_ERR kssl_err;
#endif /* OPENSSL_NO_KRB5 */
#ifndef OPENSSL_NO_ECDH
EC_KEY *srvr_ecdh = NULL;
EVP_PKEY *clnt_pub_pkey = NULL;
EC_POINT *clnt_ecpoint = NULL;
BN_CTX *bn_ctx = NULL;
#endif
n=s->method->ssl_get_message(s,
SSL3_ST_SR_KEY_EXCH_A,
SSL3_ST_SR_KEY_EXCH_B,
SSL3_MT_CLIENT_KEY_EXCHANGE,
2048, /* ??? */
&ok);
if (!ok) return((int)n);
p=(unsigned char *)s->init_msg;
alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
#ifndef OPENSSL_NO_RSA
if (alg_k & SSL_kRSA)
{
/* FIX THIS UP EAY EAY EAY EAY */
if (s->s3->tmp.use_rsa_tmp)
{
if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
rsa=s->cert->rsa_tmp;
/* Don't do a callback because rsa_tmp should
* be sent already */
if (rsa == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
goto f_err;
}
}
else
{
pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
if ( (pkey == NULL) ||
(pkey->type != EVP_PKEY_RSA) ||
(pkey->pkey.rsa == NULL))
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
goto f_err;
}
rsa=pkey->pkey.rsa;
}
/* TLS and [incidentally] DTLS{0xFEFF} */
if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
{
n2s(p,i);
if (n != i+2)
{
if (!(s->options & SSL_OP_TLS_D5_BUG))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
goto err;
}
else
p-=2;
}
else
n=i;
}
i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
al = -1;
if (i != SSL_MAX_MASTER_KEY_LENGTH)
{
al=SSL_AD_DECODE_ERROR;
/* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
}
if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
{
/* The premaster secret must contain the same version number as the
* ClientHello to detect version rollback attacks (strangely, the
* protocol does not offer such protection for DH ciphersuites).
* However, buggy clients exist that send the negotiated protocol
* version instead if the server does not support the requested
* protocol version.
* If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
(p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
{
al=SSL_AD_DECODE_ERROR;
/* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
/* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
* (http://eprint.iacr.org/2003/052/) exploits the version
* number check as a "bad version oracle" -- an alert would
* reveal that the plaintext corresponding to some ciphertext
* made up by the adversary is properly formatted except
* that the version number is wrong. To avoid such attacks,
* we should treat this just like any other decryption error. */
}
}
if (al != -1)
{
/* Some decryption failure -- use random value instead as countermeasure
* against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
* (see RFC 2246, section 7.4.7.1). */
ERR_clear_error();
i = SSL_MAX_MASTER_KEY_LENGTH;
p[0] = s->client_version >> 8;
p[1] = s->client_version & 0xff;
if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
goto err;
}
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key,
p,i);
OPENSSL_cleanse(p,i);
}
else
#endif
#ifndef OPENSSL_NO_DH
if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
{
n2s(p,i);
if (n != i+2)
{
if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
goto err;
}
else
{
p-=2;
i=(int)n;
}
}
if (n == 0L) /* the parameters are in the cert */
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
goto f_err;
}
else
{
if (s->s3->tmp.dh == NULL)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
goto f_err;
}
else
dh_srvr=s->s3->tmp.dh;
}
pub=BN_bin2bn(p,i,NULL);
if (pub == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
goto err;
}
i=DH_compute_key(p,pub,dh_srvr);
if (i <= 0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
goto err;
}
DH_free(s->s3->tmp.dh);
s->s3->tmp.dh=NULL;
BN_clear_free(pub);
pub=NULL;
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key,p,i);
OPENSSL_cleanse(p,i);
}
else
#endif
#ifndef OPENSSL_NO_KRB5
if (alg_k & SSL_kKRB5)
{
krb5_error_code krb5rc;
krb5_data enc_ticket;
krb5_data authenticator;
krb5_data enc_pms;
KSSL_CTX *kssl_ctx = s->kssl_ctx;
EVP_CIPHER_CTX ciph_ctx;
const EVP_CIPHER *enc = NULL;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH
+ EVP_MAX_BLOCK_LENGTH];
int padl, outl;
krb5_timestamp authtime = 0;
krb5_ticket_times ttimes;
EVP_CIPHER_CTX_init(&ciph_ctx);
if (!kssl_ctx) kssl_ctx = kssl_ctx_new();
n2s(p,i);
enc_ticket.length = i;
if (n < (long)(enc_ticket.length + 6))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto err;
}
enc_ticket.data = (char *)p;
p+=enc_ticket.length;
n2s(p,i);
authenticator.length = i;
if (n < (long)(enc_ticket.length + authenticator.length + 6))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto err;
}
authenticator.data = (char *)p;
p+=authenticator.length;
n2s(p,i);
enc_pms.length = i;
enc_pms.data = (char *)p;
p+=enc_pms.length;
/* Note that the length is checked again below,
** after decryption
*/
if(enc_pms.length > sizeof pms)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto err;
}
if (n != (long)(enc_ticket.length + authenticator.length +
enc_pms.length + 6))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto err;
}
if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
&kssl_err)) != 0)
{
#ifdef KSSL_DEBUG
printf("kssl_sget_tkt rtn %d [%d]\n",
krb5rc, kssl_err.reason);
if (kssl_err.text)
printf("kssl_err text= %s\n", kssl_err.text);
#endif /* KSSL_DEBUG */
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
kssl_err.reason);
goto err;
}
/* Note: no authenticator is not considered an error,
** but will return authtime == 0.
*/
if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
&authtime, &kssl_err)) != 0)
{
#ifdef KSSL_DEBUG
printf("kssl_check_authent rtn %d [%d]\n",
krb5rc, kssl_err.reason);
if (kssl_err.text)
printf("kssl_err text= %s\n", kssl_err.text);
#endif /* KSSL_DEBUG */
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
kssl_err.reason);
goto err;
}
if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
goto err;
}
#ifdef KSSL_DEBUG
kssl_ctx_show(kssl_ctx);
#endif /* KSSL_DEBUG */
enc = kssl_map_enc(kssl_ctx->enctype);
if (enc == NULL)
goto err;
memset(iv, 0, sizeof iv); /* per RFC 1510 */
if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DECRYPTION_FAILED);
goto err;
}
if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
(unsigned char *)enc_pms.data, enc_pms.length))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DECRYPTION_FAILED);
goto err;
}
if (outl > SSL_MAX_MASTER_KEY_LENGTH)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto err;
}
if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DECRYPTION_FAILED);
goto err;
}
outl += padl;
if (outl > SSL_MAX_MASTER_KEY_LENGTH)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto err;
}
if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
{
/* The premaster secret must contain the same version number as the
* ClientHello to detect version rollback attacks (strangely, the
* protocol does not offer such protection for DH ciphersuites).
* However, buggy clients exist that send random bytes instead of
* the protocol version.
* If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
* (Perhaps we should have a separate BUG value for the Kerberos cipher)
*/
if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_AD_DECODE_ERROR);
goto err;
}
}
EVP_CIPHER_CTX_cleanup(&ciph_ctx);
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key, pms, outl);
if (kssl_ctx->client_princ)
{
size_t len = strlen(kssl_ctx->client_princ);
if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
{
s->session->krb5_client_princ_len = len;
memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
}
}
/* Was doing kssl_ctx_free() here,
** but it caused problems for apache.
** kssl_ctx = kssl_ctx_free(kssl_ctx);
** if (s->kssl_ctx) s->kssl_ctx = NULL;
*/
}
else
#endif /* OPENSSL_NO_KRB5 */
#ifndef OPENSSL_NO_ECDH
if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
{
int ret = 1;
int field_size = 0;
const EC_KEY *tkey;
const EC_GROUP *group;
const BIGNUM *priv_key;
/* initialize structures for server's ECDH key pair */
if ((srvr_ecdh = EC_KEY_new()) == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
/* Let's get server private key and group information */
if (alg_k & (SSL_kECDHr|SSL_kECDHe))
{
/* use the certificate */
tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
}
else
{
/* use the ephermeral values we saved when
* generating the ServerKeyExchange msg.
*/
tkey = s->s3->tmp.ecdh;
}
group = EC_KEY_get0_group(tkey);
priv_key = EC_KEY_get0_private_key(tkey);
if (!EC_KEY_set_group(srvr_ecdh, group) ||
!EC_KEY_set_private_key(srvr_ecdh, priv_key))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_EC_LIB);
goto err;
}
/* Let's get client's public key */
if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
if (n == 0L)
{
/* Client Publickey was in Client Certificate */
if (alg_k & SSL_kEECDH)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
goto f_err;
}
if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
== NULL) ||
(clnt_pub_pkey->type != EVP_PKEY_EC))
{
/* XXX: For now, we do not support client
* authentication using ECDH certificates
* so this branch (n == 0L) of the code is
* never executed. When that support is
* added, we ought to ensure the key
* received in the certificate is
* authorized for key agreement.
* ECDH_compute_key implicitly checks that
* the two ECDH shares are for the same
* group.
*/
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
goto f_err;
}
if (EC_POINT_copy(clnt_ecpoint,
EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_EC_LIB);
goto err;
}
ret = 2; /* Skip certificate verify processing */
}
else
{
/* Get client's public key from encoded point
* in the ClientKeyExchange message.
*/
if ((bn_ctx = BN_CTX_new()) == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
/* Get encoded point length */
i = *p;
p += 1;
if (EC_POINT_oct2point(group,
clnt_ecpoint, p, i, bn_ctx) == 0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_EC_LIB);
goto err;
}
/* p is pointing to somewhere in the buffer
* currently, so set it to the start
*/
p=(unsigned char *)s->init_buf->data;
}
/* Compute the shared pre-master secret */
field_size = EC_GROUP_get_degree(group);
if (field_size <= 0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_ECDH_LIB);
goto err;
}
i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
if (i <= 0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_ECDH_LIB);
goto err;
}
EVP_PKEY_free(clnt_pub_pkey);
EC_POINT_free(clnt_ecpoint);
EC_KEY_free(srvr_ecdh);
BN_CTX_free(bn_ctx);
EC_KEY_free(s->s3->tmp.ecdh);
s->s3->tmp.ecdh = NULL;
/* Compute the master secret */
s->session->master_key_length = s->method->ssl3_enc-> \
generate_master_secret(s, s->session->master_key, p, i);
OPENSSL_cleanse(p, i);
return (ret);
}
else
#endif
#ifndef OPENSSL_NO_PSK
if (alg_k & SSL_kPSK)
{
unsigned char *t = NULL;
unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
unsigned int pre_ms_len = 0, psk_len = 0;
int psk_err = 1;
char tmp_id[PSK_MAX_IDENTITY_LEN+1];
al=SSL_AD_HANDSHAKE_FAILURE;
n2s(p,i);
if (n != i+2)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_LENGTH_MISMATCH);
goto psk_err;
}
if (i > PSK_MAX_IDENTITY_LEN)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_DATA_LENGTH_TOO_LONG);
goto psk_err;
}
if (s->psk_server_callback == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_PSK_NO_SERVER_CB);
goto psk_err;
}
/* Create guaranteed NULL-terminated identity
* string for the callback */
memcpy(tmp_id, p, i);
memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
psk_len = s->psk_server_callback(s, tmp_id,
psk_or_pre_ms, sizeof(psk_or_pre_ms));
OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
if (psk_len > PSK_MAX_PSK_LEN)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_INTERNAL_ERROR);
goto psk_err;
}
else if (psk_len == 0)
{
/* PSK related to the given identity not found */
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_PSK_IDENTITY_NOT_FOUND);
al=SSL_AD_UNKNOWN_PSK_IDENTITY;
goto psk_err;
}
/* create PSK pre_master_secret */
pre_ms_len=2+psk_len+2+psk_len;
t = psk_or_pre_ms;
memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
s2n(psk_len, t);
memset(t, 0, psk_len);
t+=psk_len;
s2n(psk_len, t);
if (s->session->psk_identity != NULL)
OPENSSL_free(s->session->psk_identity);
s->session->psk_identity = BUF_strdup((char *)p);
if (s->session->psk_identity == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto psk_err;
}
if (s->session->psk_identity_hint != NULL)
OPENSSL_free(s->session->psk_identity_hint);
s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
if (s->ctx->psk_identity_hint != NULL &&
s->session->psk_identity_hint == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto psk_err;
}
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key, psk_or_pre_ms, pre_ms_len);
psk_err = 0;
psk_err:
OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
if (psk_err != 0)
goto f_err;
}
else
#endif
#ifndef OPENSSL_NO_SRP
if (alg_k & SSL_kSRP)
{
int param_len;
n2s(p,i);
param_len=i+2;
if (param_len > n)
{
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
goto f_err;
}
if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
goto err;
}
if (s->session->srp_username != NULL)
OPENSSL_free(s->session->srp_username);
s->session->srp_username = BUF_strdup(s->srp_ctx.login);
if (s->session->srp_username == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
ERR_R_MALLOC_FAILURE);
goto err;
}
if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
goto err;
}
p+=i;
}
else
#endif /* OPENSSL_NO_SRP */
if (alg_k & SSL_kGOST)
{
int ret = 0;
EVP_PKEY_CTX *pkey_ctx;
EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
unsigned char premaster_secret[32], *start;
size_t outlen=32, inlen;
unsigned long alg_a;
/* Get our certificate private key*/
alg_a = s->s3->tmp.new_cipher->algorithm_auth;
if (alg_a & SSL_aGOST94)
pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
else if (alg_a & SSL_aGOST01)
pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
EVP_PKEY_decrypt_init(pkey_ctx);
/* If client certificate is present and is of the same type, maybe
* use it for key exchange. Don't mind errors from
* EVP_PKEY_derive_set_peer, because it is completely valid to use
* a client certificate for authorization only. */
client_pub_pkey = X509_get_pubkey(s->session->peer);
if (client_pub_pkey)
{
if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
ERR_clear_error();
}
/* Decrypt session key */
if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
goto gerr;
}
if (p[1] == 0x81)
{
start = p+3;
inlen = p[2];
}
else if (p[1] < 0x80)
{
start = p+2;
inlen = p[1];
}
else
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
goto gerr;
}
if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
goto gerr;
}
/* Generate master secret */
s->session->master_key_length=
s->method->ssl3_enc->generate_master_secret(s,
s->session->master_key,premaster_secret,32);
/* Check if pubkey from client certificate was used */
if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
ret = 2;
else
ret = 1;
gerr:
EVP_PKEY_free(client_pub_pkey);
EVP_PKEY_CTX_free(pkey_ctx);
if (ret)
return ret;
else
goto err;
}
else
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
SSL_R_UNKNOWN_CIPHER_TYPE);
goto f_err;
}
return(1);
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
#if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
err:
#endif
#ifndef OPENSSL_NO_ECDH
EVP_PKEY_free(clnt_pub_pkey);
EC_POINT_free(clnt_ecpoint);
if (srvr_ecdh != NULL)
EC_KEY_free(srvr_ecdh);
BN_CTX_free(bn_ctx);
#endif
return(-1);
}
int ssl3_get_cert_verify(SSL *s)
{
EVP_PKEY *pkey=NULL;
unsigned char *p;
int al,ok,ret=0;
long n;
int type=0,i,j;
X509 *peer;
n=s->method->ssl_get_message(s,
SSL3_ST_SR_CERT_VRFY_A,
SSL3_ST_SR_CERT_VRFY_B,
-1,
514, /* 514? */
&ok);
if (!ok) return((int)n);
if (s->session->peer != NULL)
{
peer=s->session->peer;
pkey=X509_get_pubkey(peer);
type=X509_certificate_type(peer,pkey);
}
else
{
peer=NULL;
pkey=NULL;
}
if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
{
s->s3->tmp.reuse_message=1;
if ((peer != NULL) && (type | EVP_PKT_SIGN))
{
al=SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
goto f_err;
}
ret=1;
goto end;
}
if (peer == NULL)
{
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
al=SSL_AD_UNEXPECTED_MESSAGE;
goto f_err;
}
if (!(type & EVP_PKT_SIGN))
{
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
al=SSL_AD_ILLEGAL_PARAMETER;
goto f_err;
}
if (s->s3->change_cipher_spec)
{
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
al=SSL_AD_UNEXPECTED_MESSAGE;
goto f_err;
}
/* we now have a signature that we need to verify */
p=(unsigned char *)s->init_msg;
/* Check for broken implementations of GOST ciphersuites */
/* If key is GOST and n is exactly 64, it is bare
* signature without length field */
if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
pkey->type == NID_id_GostR3410_2001) )
{
i=64;
}
else
{
n2s(p,i);
n-=2;
if (i > n)
{
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
al=SSL_AD_DECODE_ERROR;
goto f_err;
}
}
j=EVP_PKEY_size(pkey);
if ((i > j) || (n > j) || (n <= 0))
{
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
al=SSL_AD_DECODE_ERROR;
goto f_err;
}
#ifndef OPENSSL_NO_RSA
if (pkey->type == EVP_PKEY_RSA)
{
i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
pkey->pkey.rsa);
if (i < 0)
{
al=SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
goto f_err;
}
if (i == 0)
{
al=SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
goto f_err;
}
}
else
#endif
#ifndef OPENSSL_NO_DSA
if (pkey->type == EVP_PKEY_DSA)
{
j=DSA_verify(pkey->save_type,
&(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
if (j <= 0)
{
/* bad signature */
al=SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
goto f_err;
}
}
else
#endif
#ifndef OPENSSL_NO_ECDSA
if (pkey->type == EVP_PKEY_EC)
{
j=ECDSA_verify(pkey->save_type,
&(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
if (j <= 0)
{
/* bad signature */
al=SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
SSL_R_BAD_ECDSA_SIGNATURE);
goto f_err;
}
}
else
#endif
if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
{ unsigned char signature[64];
int idx;
EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
EVP_PKEY_verify_init(pctx);
if (i!=64) {
fprintf(stderr,"GOST signature length is %d",i);
}
for (idx=0;idx<64;idx++) {
signature[63-idx]=p[idx];
}
j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
EVP_PKEY_CTX_free(pctx);
if (j<=0)
{
al=SSL_AD_DECRYPT_ERROR;
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
SSL_R_BAD_ECDSA_SIGNATURE);
goto f_err;
}
}
else
{
SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
al=SSL_AD_UNSUPPORTED_CERTIFICATE;
goto f_err;
}
ret=1;
if (0)
{
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
}
end:
EVP_PKEY_free(pkey);
return(ret);
}
int ssl3_get_client_certificate(SSL *s)
{
int i,ok,al,ret= -1;
X509 *x=NULL;
unsigned long l,nc,llen,n;
const unsigned char *p,*q;
unsigned char *d;
STACK_OF(X509) *sk=NULL;
n=s->method->ssl_get_message(s,
SSL3_ST_SR_CERT_A,
SSL3_ST_SR_CERT_B,
-1,
s->max_cert_list,
&ok);
if (!ok) return((int)n);
if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
{
if ( (s->verify_mode & SSL_VERIFY_PEER) &&
(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
al=SSL_AD_HANDSHAKE_FAILURE;
goto f_err;
}
/* If tls asked for a client cert, the client must return a 0 list */
if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
al=SSL_AD_UNEXPECTED_MESSAGE;
goto f_err;
}
s->s3->tmp.reuse_message=1;
return(1);
}
if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
{
al=SSL_AD_UNEXPECTED_MESSAGE;
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
goto f_err;
}
p=d=(unsigned char *)s->init_msg;
if ((sk=sk_X509_new_null()) == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
goto err;
}
n2l3(p,llen);
if (llen+3 != n)
{
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
goto f_err;
}
for (nc=0; nc<llen; )
{
n2l3(p,l);
if ((l+nc+3) > llen)
{
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
goto f_err;
}
q=p;
x=d2i_X509(NULL,&p,l);
if (x == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
goto err;
}
if (p != (q+l))
{
al=SSL_AD_DECODE_ERROR;
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
goto f_err;
}
if (!sk_X509_push(sk,x))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
goto err;
}
x=NULL;
nc+=l+3;
}
if (sk_X509_num(sk) <= 0)
{
/* TLS does not mind 0 certs returned */
if (s->version == SSL3_VERSION)
{
al=SSL_AD_HANDSHAKE_FAILURE;
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
goto f_err;
}
/* Fail for TLS only if we required a certificate */
else if ((s->verify_mode & SSL_VERIFY_PEER) &&
(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
al=SSL_AD_HANDSHAKE_FAILURE;
goto f_err;
}
}
else
{
i=ssl_verify_cert_chain(s,sk);
if (i <= 0)
{
al=ssl_verify_alarm_type(s->verify_result);
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
goto f_err;
}
}
if (s->session->peer != NULL) /* This should not be needed */
X509_free(s->session->peer);
s->session->peer=sk_X509_shift(sk);
s->session->verify_result = s->verify_result;
/* With the current implementation, sess_cert will always be NULL
* when we arrive here. */
if (s->session->sess_cert == NULL)
{
s->session->sess_cert = ssl_sess_cert_new();
if (s->session->sess_cert == NULL)
{
SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
goto err;
}
}
if (s->session->sess_cert->cert_chain != NULL)
sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
s->session->sess_cert->cert_chain=sk;
/* Inconsistency alert: cert_chain does *not* include the
* peer's own certificate, while we do include it in s3_clnt.c */
sk=NULL;
ret=1;
if (0)
{
f_err:
ssl3_send_alert(s,SSL3_AL_FATAL,al);
}
err:
if (x != NULL) X509_free(x);
if (sk != NULL) sk_X509_pop_free(sk,X509_free);
return(ret);
}
int ssl3_send_server_certificate(SSL *s)
{
unsigned long l;
X509 *x;
if (s->state == SSL3_ST_SW_CERT_A)
{
x=ssl_get_server_send_cert(s);
if (x == NULL)
{
/* VRS: allow null cert if auth == KRB5 */
if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
{
SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
return(0);
}
}
l=ssl3_output_cert_chain(s,x);
s->state=SSL3_ST_SW_CERT_B;
s->init_num=(int)l;
s->init_off=0;
}
/* SSL3_ST_SW_CERT_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
}
#ifndef OPENSSL_NO_TLSEXT
int ssl3_send_newsession_ticket(SSL *s)
{
if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
{
unsigned char *p, *senc, *macstart;
int len, slen;
unsigned int hlen;
EVP_CIPHER_CTX ctx;
HMAC_CTX hctx;
SSL_CTX *tctx = s->initial_ctx;
unsigned char iv[EVP_MAX_IV_LENGTH];
unsigned char key_name[16];
/* get session encoding length */
slen = i2d_SSL_SESSION(s->session, NULL);
/* Some length values are 16 bits, so forget it if session is
* too long
*/
if (slen > 0xFF00)
return -1;
/* Grow buffer if need be: the length calculation is as
* follows 1 (size of message name) + 3 (message length
* bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
* 16 (key name) + max_iv_len (iv length) +
* session_length + max_enc_block_size (max encrypted session
* length) + max_md_size (HMAC).
*/
if (!BUF_MEM_grow(s->init_buf,
26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
EVP_MAX_MD_SIZE + slen))
return -1;
senc = OPENSSL_malloc(slen);
if (!senc)
return -1;
p = senc;
i2d_SSL_SESSION(s->session, &p);
p=(unsigned char *)s->init_buf->data;
/* do the header */
*(p++)=SSL3_MT_NEWSESSION_TICKET;
/* Skip message length for now */
p += 3;
EVP_CIPHER_CTX_init(&ctx);
HMAC_CTX_init(&hctx);
/* Initialize HMAC and cipher contexts. If callback present
* it does all the work otherwise use generated values
* from parent ctx.
*/
if (tctx->tlsext_ticket_key_cb)
{
if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
&hctx, 1) < 0)
{
OPENSSL_free(senc);
return -1;
}
}
else
{
RAND_pseudo_bytes(iv, 16);
EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
tctx->tlsext_tick_aes_key, iv);
HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
tlsext_tick_md(), NULL);
memcpy(key_name, tctx->tlsext_tick_key_name, 16);
}
l2n(s->session->tlsext_tick_lifetime_hint, p);
/* Skip ticket length for now */
p += 2;
/* Output key name */
macstart = p;
memcpy(p, key_name, 16);
p += 16;
/* output IV */
memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
p += EVP_CIPHER_CTX_iv_length(&ctx);
/* Encrypt session data */
EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
p += len;
EVP_EncryptFinal(&ctx, p, &len);
p += len;
EVP_CIPHER_CTX_cleanup(&ctx);
HMAC_Update(&hctx, macstart, p - macstart);
HMAC_Final(&hctx, p, &hlen);
HMAC_CTX_cleanup(&hctx);
p += hlen;
/* Now write out lengths: p points to end of data written */
/* Total length */
len = p - (unsigned char *)s->init_buf->data;
p=(unsigned char *)s->init_buf->data + 1;
l2n3(len - 4, p); /* Message length */
p += 4;
s2n(len - 10, p); /* Ticket length */
/* number of bytes to write */
s->init_num= len;
s->state=SSL3_ST_SW_SESSION_TICKET_B;
s->init_off=0;
OPENSSL_free(senc);
}
/* SSL3_ST_SW_SESSION_TICKET_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
}
int ssl3_send_cert_status(SSL *s)
{
if (s->state == SSL3_ST_SW_CERT_STATUS_A)
{
unsigned char *p;
/* Grow buffer if need be: the length calculation is as
* follows 1 (message type) + 3 (message length) +
* 1 (ocsp response type) + 3 (ocsp response length)
* + (ocsp response)
*/
if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
return -1;
p=(unsigned char *)s->init_buf->data;
/* do the header */
*(p++)=SSL3_MT_CERTIFICATE_STATUS;
/* message length */
l2n3(s->tlsext_ocsp_resplen + 4, p);
/* status type */
*(p++)= s->tlsext_status_type;
/* length of OCSP response */
l2n3(s->tlsext_ocsp_resplen, p);
/* actual response */
memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
/* number of bytes to write */
s->init_num = 8 + s->tlsext_ocsp_resplen;
s->state=SSL3_ST_SW_CERT_STATUS_B;
s->init_off = 0;
}
/* SSL3_ST_SW_CERT_STATUS_B */
return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
}
# ifndef OPENSSL_NO_NPN
/* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
* sets the next_proto member in s if found */
int ssl3_get_next_proto(SSL *s)
{
int ok;
int proto_len, padding_len;
long n;
const unsigned char *p;
/* Clients cannot send a NextProtocol message if we didn't see the
* extension in their ClientHello */
if (!s->s3->next_proto_neg_seen)
{
SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
return -1;
}
n=s->method->ssl_get_message(s,
SSL3_ST_SR_NEXT_PROTO_A,
SSL3_ST_SR_NEXT_PROTO_B,
SSL3_MT_NEXT_PROTO,
514, /* See the payload format below */
&ok);
if (!ok)
return((int)n);
/* s->state doesn't reflect whether ChangeCipherSpec has been received
* in this handshake, but s->s3->change_cipher_spec does (will be reset
* by ssl3_get_finished). */
if (!s->s3->change_cipher_spec)
{
SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
return -1;
}
if (n < 2)
return 0; /* The body must be > 1 bytes long */
p=(unsigned char *)s->init_msg;
/* The payload looks like:
* uint8 proto_len;
* uint8 proto[proto_len];
* uint8 padding_len;
* uint8 padding[padding_len];
*/
proto_len = p[0];
if (proto_len + 2 > s->init_num)
return 0;
padding_len = p[proto_len + 1];
if (proto_len + padding_len + 2 != s->init_num)
return 0;
s->next_proto_negotiated = OPENSSL_malloc(proto_len);
if (!s->next_proto_negotiated)
{
SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
return 0;
}
memcpy(s->next_proto_negotiated, p + 1, proto_len);
s->next_proto_negotiated_len = proto_len;
return 1;
}
# endif
#endif
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