diff options
Diffstat (limited to 'thirdparty/openssl/ssl/s3_srvr.c')
| -rw-r--r-- | thirdparty/openssl/ssl/s3_srvr.c | 3614 |
1 files changed, 3614 insertions, 0 deletions
diff --git a/thirdparty/openssl/ssl/s3_srvr.c b/thirdparty/openssl/ssl/s3_srvr.c new file mode 100644 index 0000000000..ab28702ee9 --- /dev/null +++ b/thirdparty/openssl/ssl/s3_srvr.c @@ -0,0 +1,3614 @@ +/* ssl/s3_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) 1998-2007 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 "ssl_locl.h" +#include "kssl_lcl.h" +#include "../crypto/constant_time_locl.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> + +#ifndef OPENSSL_NO_SSL3_METHOD +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); +} + +IMPLEMENT_ssl3_meth_func(SSLv3_server_method, + ssl3_accept, + ssl_undefined_function, ssl3_get_server_method) +#endif +#ifndef OPENSSL_NO_SRP +static int ssl_check_srp_ext_ClientHello(SSL *s, int *al) +{ + int ret = SSL_ERROR_NONE; + + *al = 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) { + /* + * RFC 5054 says SHOULD reject, we do so if There is no srp + * login name + */ + ret = SSL3_AL_FATAL; + *al = SSL_AD_UNKNOWN_PSK_IDENTITY; + } else { + ret = SSL_srp_server_param_with_username(s, al); + } + } + return ret; +} +#endif + +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; + + 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); + } +#ifndef OPENSSL_NO_HEARTBEATS + /* + * If we're awaiting a HeartbeatResponse, pretend we already got and + * don't await it anymore, because Heartbeats don't make sense during + * handshakes anyway. + */ + if (s->tlsext_hb_pending) { + s->tlsext_hb_pending = 0; + s->tlsext_hb_seq++; + } +#endif + + 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); + s->state = SSL_ST_ERR; + return -1; + } + s->type = SSL_ST_ACCEPT; + + if (s->init_buf == NULL) { + if ((buf = BUF_MEM_new()) == NULL) { + ret = -1; + s->state = SSL_ST_ERR; + goto end; + } + if (!BUF_MEM_grow(buf, SSL3_RT_MAX_PLAIN_LENGTH)) { + BUF_MEM_free(buf); + ret = -1; + s->state = SSL_ST_ERR; + goto end; + } + s->init_buf = buf; + } + + if (!ssl3_setup_buffers(s)) { + ret = -1; + s->state = SSL_ST_ERR; + goto end; + } + + s->init_num = 0; + s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY; + s->s3->flags &= ~SSL3_FLAGS_CCS_OK; + /* + * Should have been reset by ssl3_get_finished, too. + */ + s->s3->change_cipher_spec = 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; + s->state = SSL_ST_ERR; + 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; + s->state = SSL_ST_ERR; + 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: + + s->shutdown = 0; + ret = ssl3_get_client_hello(s); + if (ret <= 0) + goto end; +#ifndef OPENSSL_NO_SRP + s->state = SSL3_ST_SR_CLNT_HELLO_D; + case SSL3_ST_SR_CLNT_HELLO_D: + { + int al; + if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) { + /* + * callback indicates firther work to be done + */ + s->rwstate = SSL_X509_LOOKUP; + goto end; + } + if (ret != SSL_ERROR_NONE) { + ssl3_send_alert(s, SSL3_AL_FATAL, al); + /* + * This is not really an error but the only means to for + * a client to detect whether srp is supported. + */ + if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY) + SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_CLIENTHELLO_TLSEXT); + ret = -1; + s->state = SSL_ST_ERR; + 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 | SSL_aKRB5 | + SSL_aSRP)) +&& !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) { + 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 + */ + 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 (0 + /* + * 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_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) || + /* don't request certificate for SRP auth */ + (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP) + /* + * 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; + if (s->s3->handshake_buffer) { + if (!ssl3_digest_cached_records(s)) { + s->state = SSL_ST_ERR; + return -1; + } + } + } 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: + 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 if (SSL_USE_SIGALGS(s)) { + s->state = SSL3_ST_SR_CERT_VRFY_A; + s->init_num = 0; + if (!s->session->peer) + break; + /* + * For sigalgs freeze the handshake buffer at this point and + * digest cached records. + */ + if (!s->s3->handshake_buffer) { + SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR); + s->state = SSL_ST_ERR; + return -1; + } + s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE; + if (!ssl3_digest_cached_records(s)) { + s->state = SSL_ST_ERR; + return -1; + } + } 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)) { + s->state = SSL_ST_ERR; + 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) { + s->state = SSL_ST_ERR; + ret = -1; + goto end; + } + offset += dgst_size; + } + } + break; + + case SSL3_ST_SR_CERT_VRFY_A: + case SSL3_ST_SR_CERT_VRFY_B: + 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: + /* + * Enable CCS for NPN. Receiving a CCS clears the flag, so make + * sure not to re-enable it to ban duplicates. This *should* be the + * first time we have received one - but we check anyway to be + * cautious. + * s->s3->change_cipher_spec is set when a CCS is + * processed in s3_pkt.c, and remains set until + * the client's Finished message is read. + */ + if (!s->s3->change_cipher_spec) + s->s3->flags |= SSL3_FLAGS_CCS_OK; + + 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: + /* + * Enable CCS for handshakes without NPN. In NPN the CCS flag has + * already been set. Receiving a CCS clears the flag, so make + * sure not to re-enable it to ban duplicates. + * s->s3->change_cipher_spec is set when a CCS is + * processed in s3_pkt.c, and remains set until + * the client's Finished message is read. + */ + if (!s->s3->change_cipher_spec) + s->s3->flags |= SSL3_FLAGS_CCS_OK; + ret = ssl3_get_finished(s, SSL3_ST_SR_FINISHED_A, + SSL3_ST_SR_FINISHED_B); + if (ret <= 0) + goto end; + if (s->hit) + s->state = SSL_ST_OK; +#ifndef OPENSSL_NO_TLSEXT + else if (s->tlsext_ticket_expected) + s->state = SSL3_ST_SW_SESSION_TICKET_A; +#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; + s->state = SSL_ST_ERR; + 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; + s->state = SSL_ST_ERR; + 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 */ + 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; */ + + case SSL_ST_ERR: + 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) +{ + + if (s->state == SSL3_ST_SW_HELLO_REQ_A) { + ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0); + s->state = SSL3_ST_SW_HELLO_REQ_B; + } + + /* SSL3_ST_SW_HELLO_REQ_B */ + return ssl_do_write(s); +} + +int ssl3_get_client_hello(SSL *s) +{ + int i, j, ok, al = SSL_AD_INTERNAL_ERROR, ret = -1, cookie_valid = 0; + unsigned int cookie_len; + long n; + unsigned long id; + unsigned char *p, *d; + SSL_CIPHER *c; +#ifndef OPENSSL_NO_COMP + unsigned char *q; + SSL_COMP *comp = NULL; +#endif + STACK_OF(SSL_CIPHER) *ciphers = NULL; + + if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet) + goto retry_cert; + + /* + * 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) { + 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; + + /* + * 2 bytes for client version, SSL3_RANDOM_SIZE bytes for random, 1 byte + * for session id length + */ + if (n < 2 + SSL3_RANDOM_SIZE + 1) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + + /* + * 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 (SSL_IS_DTLS(s) ? (s->client_version > s->version && + s->method->version != DTLS_ANY_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 && + !s->enc_write_ctx && !s->write_hash) { + /* + * 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); + + if (p + SSL3_RANDOM_SIZE + session_length + 1 >= d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + 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++); + + if (p + j > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + + if ((j < 0) || (j > SSL_MAX_SSL_SESSION_ID_LENGTH)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH); + goto f_err; + } + + s->hit = 0; + /* + * Versions before 0.9.7 always allow clients to resume sessions in + * renegotiation. 0.9.7 and later allow this by default, but optionally + * ignore resumption requests with flag + * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather + * than a change to default behavior so that applications relying on this + * for security won't even compile against older library versions). + * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to + * request renegotiation but not a new session (s->new_session remains + * unset): for servers, this essentially just means that the + * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be ignored. + */ + 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); + /* + * Only resume if the session's version matches the negotiated + * version. + * RFC 5246 does not provide much useful advice on resumption + * with a different protocol version. It doesn't forbid it but + * the sanity of such behaviour would be questionable. + * In practice, clients do not accept a version mismatch and + * will abort the handshake with an error. + */ + if (i == 1 && s->version == s->session->ssl_version) { /* 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 (SSL_IS_DTLS(s)) { + /* cookie stuff */ + if (p + 1 > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + cookie_len = *(p++); + + if (p + cookie_len > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + + /* + * 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 */ + } + /* default verification */ + else if (memcmp(s->d1->rcvd_cookie, s->d1->cookie, + s->d1->cookie_len) != 0) { + al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH); + goto f_err; + } + cookie_valid = 1; + } + + p += cookie_len; + if (s->method->version == DTLS_ANY_VERSION) { + /* Select version to use */ + if (s->client_version <= DTLS1_2_VERSION && + !(s->options & SSL_OP_NO_DTLSv1_2)) { + s->version = DTLS1_2_VERSION; + s->method = DTLSv1_2_server_method(); + } else if (tls1_suiteb(s)) { + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, + SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE); + s->version = s->client_version; + al = SSL_AD_PROTOCOL_VERSION; + goto f_err; + } else if (s->client_version <= DTLS1_VERSION && + !(s->options & SSL_OP_NO_DTLSv1)) { + s->version = DTLS1_VERSION; + s->method = DTLSv1_server_method(); + } else { + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, + SSL_R_WRONG_VERSION_NUMBER); + s->version = s->client_version; + al = SSL_AD_PROTOCOL_VERSION; + goto f_err; + } + s->session->ssl_version = s->version; + } + } + + if (p + 2 > d + n) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT); + goto f_err; + } + n2s(p, i); + + if (i == 0) { + al = SSL_AD_ILLEGAL_PARAMETER; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_NO_CIPHERS_SPECIFIED); + goto f_err; + } + + /* i bytes of cipher data + 1 byte for compression length later */ + if ((p + i + 1) > (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 (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) { + j = 0; + id = s->session->cipher->id; + +#ifdef CIPHER_DEBUG + fprintf(stderr, "client sent %d ciphers\n", + sk_SSL_CIPHER_num(ciphers)); +#endif + for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) { + c = sk_SSL_CIPHER_value(ciphers, i); +#ifdef CIPHER_DEBUG + fprintf(stderr, "client [%2d of %2d]:%s\n", + i, sk_SSL_CIPHER_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; + } +#ifndef OPENSSL_NO_COMP + q = p; +#endif + 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)) { + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_PARSE_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 char *pos; + pos = s->s3->server_random; + if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) { + 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) { + 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) { + 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) { + 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_INTERNAL_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, ERR_R_INTERNAL_ERROR); + goto f_err; + } + ciphers = NULL; + if (!tls1_set_server_sigalgs(s)) { + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); + goto err; + } + /* Let cert callback update server certificates if required */ + retry_cert: + if (s->cert->cert_cb) { + int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg); + if (rv == 0) { + al = SSL_AD_INTERNAL_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CERT_CB_ERROR); + goto f_err; + } + if (rv < 0) { + s->rwstate = SSL_X509_LOOKUP; + return -1; + } + s->rwstate = SSL_NOTHING; + } + 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; + } 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 (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER)) { + 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. + */ + + /* Handles TLS extensions that we couldn't check earlier */ + if (s->version >= SSL3_VERSION) { + if (ssl_check_clienthello_tlsext_late(s) <= 0) { + SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT); + goto err; + } + } + + ret = cookie_valid ? 2 : 1; + if (0) { + f_err: + ssl3_send_alert(s, SSL3_AL_FATAL, al); + err: + s->state = SSL_ST_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; + int al = 0; + unsigned long l; + + 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; + if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0) { + s->state = SSL_ST_ERR; + return -1; + } +#endif + /* Do the message type and length last */ + d = p = ssl_handshake_start(s); + + *(p++) = s->version >> 8; + *(p++) = s->version & 0xff; + + /* Random stuff */ + memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE); + p += SSL3_RANDOM_SIZE; + + /*- + * There are several cases for the session ID to send + * back in the server hello: + * - For session reuse from the session cache, + * we send back the old session ID. + * - If stateless session reuse (using a session ticket) + * is successful, we send back the client's "session ID" + * (which doesn't actually identify the session). + * - If it is a new session, we send back the new + * session ID. + * - However, if we want the new session to be single-use, + * we send back a 0-length session ID. + * s->hit is non-zero in either case of session reuse, + * so the following won't overwrite an ID that we're supposed + * to send back. + */ + if (!(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); + s->state = SSL_ST_ERR; + 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); + s->state = SSL_ST_ERR; + return -1; + } + if ((p = + ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH, + &al)) == NULL) { + ssl3_send_alert(s, SSL3_AL_FATAL, al); + SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR); + s->state = SSL_ST_ERR; + return -1; + } +#endif + /* do the header */ + l = (p - d); + ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l); + s->state = SSL3_ST_SW_SRVR_HELLO_B; + } + + /* SSL3_ST_SW_SRVR_HELLO_B */ + return ssl_do_write(s); +} + +int ssl3_send_server_done(SSL *s) +{ + + if (s->state == SSL3_ST_SW_SRVR_DONE_A) { + ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0); + s->state = SSL3_ST_SW_SRVR_DONE_B; + } + + /* SSL3_ST_SW_SRVR_DONE_B */ + return ssl_do_write(s); +} + +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) { + 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 (!DH_generate_key(dh)) { + 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 (s->cert->ecdh_tmp_auto) { + /* Get NID of appropriate shared curve */ + int nid = tls1_shared_curve(s, -2); + if (nid != NID_undef) + ecdhp = EC_KEY_new_by_curve_name(nid); + } else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb) { + 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) { + 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 (s->cert->ecdh_tmp_auto) + ecdh = ecdhp; + else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL) { + SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_ECDH_LIB); + goto err; + } + + 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; i < 4 && r[i] != NULL; 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 | SSL_aSRP)) + && !(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 + SSL_HM_HEADER_LENGTH(s) + kn)) { + SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_BUF); + goto err; + } + d = p = ssl_handshake_start(s); + + for (i = 0; i < 4 && r[i] != NULL; 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); + encodedPoint = NULL; + 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 && !SSL_USE_SIGALGS(s)) { + q = md_buf; + j = 0; + for (num = 2; num > 0; num--) { + EVP_MD_CTX_set_flags(&md_ctx, + EVP_MD_CTX_FLAG_NON_FIPS_ALLOW); + if (EVP_DigestInit_ex(&md_ctx, + (num == 2) ? s->ctx->md5 + : s->ctx->sha1, + NULL) <= 0 + || EVP_DigestUpdate(&md_ctx, &(s->s3->client_random[0]), + SSL3_RANDOM_SIZE) <= 0 + || EVP_DigestUpdate(&md_ctx, &(s->s3->server_random[0]), + SSL3_RANDOM_SIZE) <= 0 + || EVP_DigestUpdate(&md_ctx, d, n) <= 0 + || EVP_DigestFinal_ex(&md_ctx, q, + (unsigned int *)&i) <= 0) { + SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, + ERR_LIB_EVP); + al = SSL_AD_INTERNAL_ERROR; + goto f_err; + } + 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) { + /* send signature algorithm */ + if (SSL_USE_SIGALGS(s)) { + 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 + if (EVP_SignInit_ex(&md_ctx, md, NULL) <= 0 + || EVP_SignUpdate(&md_ctx, &(s->s3->client_random[0]), + SSL3_RANDOM_SIZE) <= 0 + || EVP_SignUpdate(&md_ctx, &(s->s3->server_random[0]), + SSL3_RANDOM_SIZE) <= 0 + || EVP_SignUpdate(&md_ctx, d, n) <= 0 + || EVP_SignFinal(&md_ctx, &(p[2]), + (unsigned int *)&i, pkey) <= 0) { + SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_LIB_EVP); + al = SSL_AD_INTERNAL_ERROR; + goto f_err; + } + s2n(i, p); + n += i + 2; + if (SSL_USE_SIGALGS(s)) + 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; + } + } + + ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n); + } + + s->state = SSL3_ST_SW_KEY_EXCH_B; + EVP_MD_CTX_cleanup(&md_ctx); + return ssl_do_write(s); + 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); + s->state = SSL_ST_ERR; + 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 = ssl_handshake_start(s); + + /* get the list of acceptable cert types */ + p++; + n = ssl3_get_req_cert_type(s, p); + d[0] = n; + p += n; + n++; + + if (SSL_USE_SIGALGS(s)) { + const unsigned char *psigs; + nl = tls12_get_psigalgs(s, &psigs); + s2n(nl, p); + memcpy(p, psigs, nl); + p += nl; + n += nl + 2; + } + + 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, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) { + SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST, + ERR_R_BUF_LIB); + goto err; + } + p = ssl_handshake_start(s) + 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 = ssl_handshake_start(s) + off; + s2n(nl, p); + + ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n); + +#ifdef NETSCAPE_HANG_BUG + if (!SSL_IS_DTLS(s)) { + if (!BUF_MEM_grow_clean(buf, s->init_num + 4)) { + SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST, ERR_R_BUF_LIB); + goto err; + } + 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 ssl_do_write(s); + err: + s->state = SSL_ST_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, *dh_clnt = NULL; +#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) { + unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH]; + int decrypt_len; + unsigned char decrypt_good, version_good; + size_t j; + + /* 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)) { + al = SSL_AD_DECODE_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); + goto f_err; + } else + p -= 2; + } else + n = i; + } + + /* + * Reject overly short RSA ciphertext because we want to be sure + * that the buffer size makes it safe to iterate over the entire + * size of a premaster secret (SSL_MAX_MASTER_KEY_LENGTH). The + * actual expected size is larger due to RSA padding, but the + * bound is sufficient to be safe. + */ + if (n < SSL_MAX_MASTER_KEY_LENGTH) { + al = SSL_AD_DECRYPT_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG); + goto f_err; + } + + /* + * We must not leak whether a decryption failure occurs because of + * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246, + * section 7.4.7.1). The code follows that advice of the TLS RFC and + * generates a random premaster secret for the case that the decrypt + * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1 + */ + + /* + * should be RAND_bytes, but we cannot work around a failure. + */ + if (RAND_pseudo_bytes(rand_premaster_secret, + sizeof(rand_premaster_secret)) <= 0) + goto err; + decrypt_len = + RSA_private_decrypt((int)n, p, p, rsa, RSA_PKCS1_PADDING); + ERR_clear_error(); + + /* + * decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH. decrypt_good will + * be 0xff if so and zero otherwise. + */ + decrypt_good = + constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH); + + /* + * If the version in the decrypted pre-master secret is correct then + * version_good will be 0xff, otherwise it'll be zero. 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". Thus version checks are done in + * constant time and are treated like any other decryption error. + */ + version_good = + constant_time_eq_8(p[0], (unsigned)(s->client_version >> 8)); + version_good &= + constant_time_eq_8(p[1], (unsigned)(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) { + unsigned char workaround_good; + workaround_good = + constant_time_eq_8(p[0], (unsigned)(s->version >> 8)); + workaround_good &= + constant_time_eq_8(p[1], (unsigned)(s->version & 0xff)); + version_good |= workaround_good; + } + + /* + * Both decryption and version must be good for decrypt_good to + * remain non-zero (0xff). + */ + decrypt_good &= version_good; + + /* + * Now copy rand_premaster_secret over from p using + * decrypt_good_mask. If decryption failed, then p does not + * contain valid plaintext, however, a check above guarantees + * it is still sufficiently large to read from. + */ + for (j = 0; j < sizeof(rand_premaster_secret); j++) { + p[j] = constant_time_select_8(decrypt_good, p[j], + rand_premaster_secret[j]); + } + + s->session->master_key_length = + s->method->ssl3_enc->generate_master_secret(s, + s-> + session->master_key, + p, + sizeof + (rand_premaster_secret)); + OPENSSL_cleanse(p, sizeof(rand_premaster_secret)); + } else +#endif +#ifndef OPENSSL_NO_DH + if (alg_k & (SSL_kEDH | SSL_kDHr | SSL_kDHd)) { + int idx = -1; + EVP_PKEY *skey = NULL; + if (n > 1) { + n2s(p, i); + } else { + if (alg_k & SSL_kDHE) { + al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG); + goto f_err; + } + i = 0; + } + if (n && 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 (alg_k & SSL_kDHr) + idx = SSL_PKEY_DH_RSA; + else if (alg_k & SSL_kDHd) + idx = SSL_PKEY_DH_DSA; + if (idx >= 0) { + skey = s->cert->pkeys[idx].privatekey; + if ((skey == NULL) || + (skey->type != EVP_PKEY_DH) || (skey->pkey.dh == NULL)) { + al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_MISSING_RSA_CERTIFICATE); + goto f_err; + } + dh_srvr = skey->pkey.dh; + } 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; + + if (n == 0L) { + /* Get pubkey from cert */ + EVP_PKEY *clkey = X509_get_pubkey(s->session->peer); + if (clkey) { + if (EVP_PKEY_cmp_parameters(clkey, skey) == 1) + dh_clnt = EVP_PKEY_get1_DH(clkey); + } + if (dh_clnt == NULL) { + al = SSL_AD_HANDSHAKE_FAILURE; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_MISSING_TMP_DH_KEY); + goto f_err; + } + EVP_PKEY_free(clkey); + pub = dh_clnt->pub_key; + } else + 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); + BN_clear_free(pub); + goto err; + } + + DH_free(s->s3->tmp.dh); + s->s3->tmp.dh = NULL; + if (dh_clnt) + DH_free(dh_clnt); + else + 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); + if (dh_clnt) + return 2; + } 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; + int kerr = 0; + + 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 + fprintf(stderr, "kssl_sget_tkt rtn %d [%d]\n", + krb5rc, kssl_err.reason); + if (kssl_err.text) + fprintf(stderr, "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 + fprintf(stderr, "kssl_check_authent rtn %d [%d]\n", + krb5rc, kssl_err.reason); + if (kssl_err.text) + fprintf(stderr, "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); + kerr = 1; + goto kclean; + } + if (outl > SSL_MAX_MASTER_KEY_LENGTH) { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_DATA_LENGTH_TOO_LONG); + kerr = 1; + goto kclean; + } + if (!EVP_DecryptFinal_ex(&ciph_ctx, &(pms[outl]), &padl)) { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_DECRYPTION_FAILED); + kerr = 1; + goto kclean; + } + outl += padl; + if (outl > SSL_MAX_MASTER_KEY_LENGTH) { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_DATA_LENGTH_TOO_LONG); + kerr = 1; + goto kclean; + } + 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); + kerr = 1; + goto kclean; + } + } + + 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; + */ + + kclean: + OPENSSL_cleanse(pms, sizeof(pms)); + if (kerr) + goto err; + } 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 (n != 1 + i) { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_EC_LIB); + goto err; + } + 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_strndup((char *)p, i); + 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 (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 + || BN_is_zero(s->srp_ctx.A)) { + al = SSL_AD_ILLEGAL_PARAMETER; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_BAD_SRP_PARAMETERS); + goto f_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; + int Ttag, Tclass; + long Tlen; + + /* 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); + if (pkey_ctx == NULL) { + al = SSL_AD_INTERNAL_ERROR; + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE); + goto f_err; + } + if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR); + goto gerr; + } + /* + * 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 (ASN1_get_object + ((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, + n) != V_ASN1_CONSTRUCTED || Ttag != V_ASN1_SEQUENCE + || Tclass != V_ASN1_UNIVERSAL) { + SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, + SSL_R_DECRYPTION_FAILED); + goto gerr; + } + start = p; + inlen = Tlen; + 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); + OPENSSL_cleanse(premaster_secret, sizeof(premaster_secret)); + /* 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 + s->state = SSL_ST_ERR; + 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; + const EVP_MD *md = NULL; + EVP_MD_CTX mctx; + EVP_MD_CTX_init(&mctx); + + /* + * We should only process a CertificateVerify message if we have received + * a Certificate from the client. If so then |s->session->peer| will be non + * NULL. In some instances a CertificateVerify message is not required even + * if the peer has sent a Certificate (e.g. such as in the case of static + * DH). In that case the ClientKeyExchange processing will skip the + * CertificateVerify state so we should not arrive here. + */ + if (s->session->peer == NULL) { + ret = 1; + goto end; + } + + n = s->method->ssl_get_message(s, + SSL3_ST_SR_CERT_VRFY_A, + SSL3_ST_SR_CERT_VRFY_B, + SSL3_MT_CERTIFICATE_VERIFY, + SSL3_RT_MAX_PLAIN_LENGTH, &ok); + + if (!ok) + return ((int)n); + + peer = s->session->peer; + pkey = X509_get_pubkey(peer); + type = X509_certificate_type(peer, pkey); + + 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; + } + + /* 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 { + if (SSL_USE_SIGALGS(s)) { + int rv = tls12_check_peer_sigalg(&md, s, p, pkey); + if (rv == -1) { + al = SSL_AD_INTERNAL_ERROR; + goto f_err; + } else if (rv == 0) { + al = SSL_AD_DECODE_ERROR; + goto f_err; + } +#ifdef SSL_DEBUG + fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md)); +#endif + p += 2; + n -= 2; + } + 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; + } + + if (SSL_USE_SIGALGS(s)) { + long hdatalen = 0; + void *hdata; + hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata); + if (hdatalen <= 0) { + SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR); + al = SSL_AD_INTERNAL_ERROR; + goto f_err; + } +#ifdef SSL_DEBUG + fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n", + EVP_MD_name(md)); +#endif + if (!EVP_VerifyInit_ex(&mctx, md, NULL) + || !EVP_VerifyUpdate(&mctx, hdata, hdatalen)) { + SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB); + al = SSL_AD_INTERNAL_ERROR; + goto f_err; + } + + if (EVP_VerifyFinal(&mctx, p, i, pkey) <= 0) { + al = SSL_AD_DECRYPT_ERROR; + SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, SSL_R_BAD_SIGNATURE); + goto f_err; + } + } else +#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); + if (pctx == NULL) { + al = SSL_AD_INTERNAL_ERROR; + SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_MALLOC_FAILURE); + goto f_err; + } + if (EVP_PKEY_verify_init(pctx) <= 0) { + EVP_PKEY_CTX_free(pctx); + al = SSL_AD_INTERNAL_ERROR; + SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR); + goto f_err; + } + 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); + s->state = SSL_ST_ERR; + } + end: + if (s->s3->handshake_buffer) { + BIO_free(s->s3->handshake_buffer); + s->s3->handshake_buffer = NULL; + s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE; + } + EVP_MD_CTX_cleanup(&mctx); + 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; + } + /* No client certificate so digest cached records */ + if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s)) { + al = SSL_AD_INTERNAL_ERROR; + 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_CERTIFICATE_VERIFY_FAILED); + 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: + s->state = SSL_ST_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) +{ + CERT_PKEY *cpk; + + if (s->state == SSL3_ST_SW_CERT_A) { + cpk = ssl_get_server_send_pkey(s); + if (cpk == 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); + s->state = SSL_ST_ERR; + return (0); + } + } + + if (!ssl3_output_cert_chain(s, cpk)) { + SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR); + s->state = SSL_ST_ERR; + return (0); + } + s->state = SSL3_ST_SW_CERT_B; + } + + /* SSL3_ST_SW_CERT_B */ + return ssl_do_write(s); +} + +#ifndef OPENSSL_NO_TLSEXT +/* send a new session ticket (not necessarily for a new session) */ +int ssl3_send_newsession_ticket(SSL *s) +{ + unsigned char *senc = NULL; + EVP_CIPHER_CTX ctx; + HMAC_CTX hctx; + + if (s->state == SSL3_ST_SW_SESSION_TICKET_A) { + unsigned char *p, *macstart; + const unsigned char *const_p; + int len, slen_full, slen; + SSL_SESSION *sess; + unsigned int hlen; + SSL_CTX *tctx = s->initial_ctx; + unsigned char iv[EVP_MAX_IV_LENGTH]; + unsigned char key_name[16]; + + /* get session encoding length */ + slen_full = i2d_SSL_SESSION(s->session, NULL); + /* + * Some length values are 16 bits, so forget it if session is too + * long + */ + if (slen_full == 0 || slen_full > 0xFF00) { + s->state = SSL_ST_ERR; + return -1; + } + senc = OPENSSL_malloc(slen_full); + if (!senc) { + s->state = SSL_ST_ERR; + return -1; + } + + EVP_CIPHER_CTX_init(&ctx); + HMAC_CTX_init(&hctx); + + p = senc; + if (!i2d_SSL_SESSION(s->session, &p)) + goto err; + + /* + * create a fresh copy (not shared with other threads) to clean up + */ + const_p = senc; + sess = d2i_SSL_SESSION(NULL, &const_p, slen_full); + if (sess == NULL) + goto err; + sess->session_id_length = 0; /* ID is irrelevant for the ticket */ + + slen = i2d_SSL_SESSION(sess, NULL); + if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */ + SSL_SESSION_free(sess); + goto err; + } + p = senc; + if (!i2d_SSL_SESSION(sess, &p)) { + SSL_SESSION_free(sess); + goto err; + } + SSL_SESSION_free(sess); + + /*- + * Grow buffer if need be: the length calculation is as + * follows handshake_header_length + + * 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, + SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH + + EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen)) + goto err; + + p = ssl_handshake_start(s); + /* + * 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) + goto err; + } else { + if (RAND_bytes(iv, 16) <= 0) + goto err; + if (!EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL, + tctx->tlsext_tick_aes_key, iv)) + goto err; + if (!HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16, + tlsext_tick_md(), NULL)) + goto err; + memcpy(key_name, tctx->tlsext_tick_key_name, 16); + } + + /* + * Ticket lifetime hint (advisory only): We leave this unspecified + * for resumed session (for simplicity), and guess that tickets for + * new sessions will live as long as their sessions. + */ + l2n(s->hit ? 0 : s->session->timeout, 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 */ + if (!EVP_EncryptUpdate(&ctx, p, &len, senc, slen)) + goto err; + p += len; + if (!EVP_EncryptFinal(&ctx, p, &len)) + goto err; + p += len; + + if (!HMAC_Update(&hctx, macstart, p - macstart)) + goto err; + if (!HMAC_Final(&hctx, p, &hlen)) + goto err; + + EVP_CIPHER_CTX_cleanup(&ctx); + HMAC_CTX_cleanup(&hctx); + + p += hlen; + /* Now write out lengths: p points to end of data written */ + /* Total length */ + len = p - ssl_handshake_start(s); + /* Skip ticket lifetime hint */ + p = ssl_handshake_start(s) + 4; + s2n(len - 6, p); + ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len); + s->state = SSL3_ST_SW_SESSION_TICKET_B; + OPENSSL_free(senc); + } + + /* SSL3_ST_SW_SESSION_TICKET_B */ + return ssl_do_write(s); + err: + if (senc) + OPENSSL_free(senc); + EVP_CIPHER_CTX_cleanup(&ctx); + HMAC_CTX_cleanup(&hctx); + s->state = SSL_ST_ERR; + return -1; +} + +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)) { + s->state = SSL_ST_ERR; + 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_NEXTPROTONEG +/* + * 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); + s->state = SSL_ST_ERR; + return -1; + } + + /* See the payload format below */ + n = s->method->ssl_get_message(s, + SSL3_ST_SR_NEXT_PROTO_A, + SSL3_ST_SR_NEXT_PROTO_B, + SSL3_MT_NEXT_PROTO, 514, &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); + s->state = SSL_ST_ERR; + return -1; + } + + if (n < 2) { + s->state = SSL_ST_ERR; + 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) { + s->state = SSL_ST_ERR; + return 0; + } + padding_len = p[proto_len + 1]; + if (proto_len + padding_len + 2 != s->init_num) { + s->state = SSL_ST_ERR; + 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); + s->state = SSL_ST_ERR; + return 0; + } + memcpy(s->next_proto_negotiated, p + 1, proto_len); + s->next_proto_negotiated_len = proto_len; + + return 1; +} +# endif + +#endif |