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      1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      2  * All rights reserved.
      3  *
      4  * This package is an SSL implementation written
      5  * by Eric Young (eay (at) cryptsoft.com).
      6  * The implementation was written so as to conform with Netscapes SSL.
      7  *
      8  * This library is free for commercial and non-commercial use as long as
      9  * the following conditions are aheared to.  The following conditions
     10  * apply to all code found in this distribution, be it the RC4, RSA,
     11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     12  * included with this distribution is covered by the same copyright terms
     13  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     14  *
     15  * Copyright remains Eric Young's, and as such any Copyright notices in
     16  * the code are not to be removed.
     17  * If this package is used in a product, Eric Young should be given attribution
     18  * as the author of the parts of the library used.
     19  * This can be in the form of a textual message at program startup or
     20  * in documentation (online or textual) provided with the package.
     21  *
     22  * Redistribution and use in source and binary forms, with or without
     23  * modification, are permitted provided that the following conditions
     24  * are met:
     25  * 1. Redistributions of source code must retain the copyright
     26  *    notice, this list of conditions and the following disclaimer.
     27  * 2. Redistributions in binary form must reproduce the above copyright
     28  *    notice, this list of conditions and the following disclaimer in the
     29  *    documentation and/or other materials provided with the distribution.
     30  * 3. All advertising materials mentioning features or use of this software
     31  *    must display the following acknowledgement:
     32  *    "This product includes cryptographic software written by
     33  *     Eric Young (eay (at) cryptsoft.com)"
     34  *    The word 'cryptographic' can be left out if the rouines from the library
     35  *    being used are not cryptographic related :-).
     36  * 4. If you include any Windows specific code (or a derivative thereof) from
     37  *    the apps directory (application code) you must include an acknowledgement:
     38  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     39  *
     40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     50  * SUCH DAMAGE.
     51  *
     52  * The licence and distribution terms for any publically available version or
     53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     54  * copied and put under another distribution licence
     55  * [including the GNU Public Licence.] */
     56 
     57 #include <openssl/ssl.h>
     58 
     59 #include <assert.h>
     60 #include <string.h>
     61 
     62 #include <openssl/buf.h>
     63 
     64 #include "../crypto/internal.h"
     65 #include "internal.h"
     66 
     67 
     68 namespace bssl {
     69 
     70 static void ssl3_on_handshake_complete(SSL *ssl) {
     71   // The handshake should have released its final message.
     72   assert(!ssl->s3->has_message);
     73 
     74   // During the handshake, |hs_buf| is retained. Release if it there is no
     75   // excess in it. There may be excess left if there server sent Finished and
     76   // HelloRequest in the same record.
     77   //
     78   // TODO(davidben): SChannel does not support this. Reject this case.
     79   if (ssl->s3->hs_buf && ssl->s3->hs_buf->length == 0) {
     80     ssl->s3->hs_buf.reset();
     81   }
     82 }
     83 
     84 static bool ssl3_set_read_state(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx) {
     85   // Cipher changes are forbidden if the current epoch has leftover data.
     86   if (tls_has_unprocessed_handshake_data(ssl)) {
     87     OPENSSL_PUT_ERROR(SSL, SSL_R_BUFFERED_MESSAGES_ON_CIPHER_CHANGE);
     88     ssl_send_alert(ssl, SSL3_AL_FATAL, SSL_AD_UNEXPECTED_MESSAGE);
     89     return false;
     90   }
     91 
     92   OPENSSL_memset(ssl->s3->read_sequence, 0, sizeof(ssl->s3->read_sequence));
     93   ssl->s3->aead_read_ctx = std::move(aead_ctx);
     94   return true;
     95 }
     96 
     97 static bool ssl3_set_write_state(SSL *ssl, UniquePtr<SSLAEADContext> aead_ctx) {
     98   OPENSSL_memset(ssl->s3->write_sequence, 0, sizeof(ssl->s3->write_sequence));
     99   ssl->s3->aead_write_ctx = std::move(aead_ctx);
    100   return true;
    101 }
    102 
    103 static const SSL_PROTOCOL_METHOD kTLSProtocolMethod = {
    104     false /* is_dtls */,
    105     ssl3_new,
    106     ssl3_free,
    107     ssl3_get_message,
    108     ssl3_next_message,
    109     ssl3_open_handshake,
    110     ssl3_open_change_cipher_spec,
    111     ssl3_open_app_data,
    112     ssl3_write_app_data,
    113     ssl3_dispatch_alert,
    114     ssl3_init_message,
    115     ssl3_finish_message,
    116     ssl3_add_message,
    117     ssl3_add_change_cipher_spec,
    118     ssl3_add_alert,
    119     ssl3_flush_flight,
    120     ssl3_on_handshake_complete,
    121     ssl3_set_read_state,
    122     ssl3_set_write_state,
    123 };
    124 
    125 static int ssl_noop_x509_check_client_CA_names(
    126     STACK_OF(CRYPTO_BUFFER) *names) {
    127   return 1;
    128 }
    129 
    130 static void ssl_noop_x509_clear(CERT *cert) {}
    131 static void ssl_noop_x509_free(CERT *cert) {}
    132 static void ssl_noop_x509_dup(CERT *new_cert, const CERT *cert) {}
    133 static void ssl_noop_x509_flush_cached_leaf(CERT *cert) {}
    134 static void ssl_noop_x509_flush_cached_chain(CERT *cert) {}
    135 static int ssl_noop_x509_session_cache_objects(SSL_SESSION *sess) {
    136   return 1;
    137 }
    138 static int ssl_noop_x509_session_dup(SSL_SESSION *new_session,
    139                                        const SSL_SESSION *session) {
    140   return 1;
    141 }
    142 static void ssl_noop_x509_session_clear(SSL_SESSION *session) {}
    143 static int ssl_noop_x509_session_verify_cert_chain(SSL_SESSION *session,
    144                                                    SSL *ssl,
    145                                                    uint8_t *out_alert) {
    146   return 0;
    147 }
    148 
    149 static void ssl_noop_x509_hs_flush_cached_ca_names(SSL_HANDSHAKE *hs) {}
    150 static int ssl_noop_x509_ssl_new(SSL *ctx) { return 1; }
    151 static void ssl_noop_x509_ssl_free(SSL *ctx) { }
    152 static void ssl_noop_x509_ssl_flush_cached_client_CA(SSL *ssl) {}
    153 static int ssl_noop_x509_ssl_auto_chain_if_needed(SSL *ssl) { return 1; }
    154 static int ssl_noop_x509_ssl_ctx_new(SSL_CTX *ctx) { return 1; }
    155 static void ssl_noop_x509_ssl_ctx_free(SSL_CTX *ctx) { }
    156 static void ssl_noop_x509_ssl_ctx_flush_cached_client_CA(SSL_CTX *ctx) {}
    157 
    158 const SSL_X509_METHOD ssl_noop_x509_method = {
    159   ssl_noop_x509_check_client_CA_names,
    160   ssl_noop_x509_clear,
    161   ssl_noop_x509_free,
    162   ssl_noop_x509_dup,
    163   ssl_noop_x509_flush_cached_chain,
    164   ssl_noop_x509_flush_cached_leaf,
    165   ssl_noop_x509_session_cache_objects,
    166   ssl_noop_x509_session_dup,
    167   ssl_noop_x509_session_clear,
    168   ssl_noop_x509_session_verify_cert_chain,
    169   ssl_noop_x509_hs_flush_cached_ca_names,
    170   ssl_noop_x509_ssl_new,
    171   ssl_noop_x509_ssl_free,
    172   ssl_noop_x509_ssl_flush_cached_client_CA,
    173   ssl_noop_x509_ssl_auto_chain_if_needed,
    174   ssl_noop_x509_ssl_ctx_new,
    175   ssl_noop_x509_ssl_ctx_free,
    176   ssl_noop_x509_ssl_ctx_flush_cached_client_CA,
    177 };
    178 
    179 }  // namespace bssl
    180 
    181 using namespace bssl;
    182 
    183 const SSL_METHOD *TLS_method(void) {
    184   static const SSL_METHOD kMethod = {
    185       0,
    186       &kTLSProtocolMethod,
    187       &ssl_crypto_x509_method,
    188   };
    189   return &kMethod;
    190 }
    191 
    192 const SSL_METHOD *SSLv23_method(void) {
    193   return TLS_method();
    194 }
    195 
    196 const SSL_METHOD *TLS_with_buffers_method(void) {
    197   static const SSL_METHOD kMethod = {
    198       0,
    199       &kTLSProtocolMethod,
    200       &ssl_noop_x509_method,
    201   };
    202   return &kMethod;
    203 }
    204 
    205 // Legacy version-locked methods.
    206 
    207 const SSL_METHOD *TLSv1_2_method(void) {
    208   static const SSL_METHOD kMethod = {
    209       TLS1_2_VERSION,
    210       &kTLSProtocolMethod,
    211       &ssl_crypto_x509_method,
    212   };
    213   return &kMethod;
    214 }
    215 
    216 const SSL_METHOD *TLSv1_1_method(void) {
    217   static const SSL_METHOD kMethod = {
    218       TLS1_1_VERSION,
    219       &kTLSProtocolMethod,
    220       &ssl_crypto_x509_method,
    221   };
    222   return &kMethod;
    223 }
    224 
    225 const SSL_METHOD *TLSv1_method(void) {
    226   static const SSL_METHOD kMethod = {
    227       TLS1_VERSION,
    228       &kTLSProtocolMethod,
    229       &ssl_crypto_x509_method,
    230   };
    231   return &kMethod;
    232 }
    233 
    234 const SSL_METHOD *SSLv3_method(void) {
    235   static const SSL_METHOD kMethod = {
    236       SSL3_VERSION,
    237       &kTLSProtocolMethod,
    238       &ssl_crypto_x509_method,
    239   };
    240   return &kMethod;
    241 }
    242 
    243 // Legacy side-specific methods.
    244 
    245 const SSL_METHOD *TLSv1_2_server_method(void) {
    246   return TLSv1_2_method();
    247 }
    248 
    249 const SSL_METHOD *TLSv1_1_server_method(void) {
    250   return TLSv1_1_method();
    251 }
    252 
    253 const SSL_METHOD *TLSv1_server_method(void) {
    254   return TLSv1_method();
    255 }
    256 
    257 const SSL_METHOD *SSLv3_server_method(void) {
    258   return SSLv3_method();
    259 }
    260 
    261 const SSL_METHOD *TLSv1_2_client_method(void) {
    262   return TLSv1_2_method();
    263 }
    264 
    265 const SSL_METHOD *TLSv1_1_client_method(void) {
    266   return TLSv1_1_method();
    267 }
    268 
    269 const SSL_METHOD *TLSv1_client_method(void) {
    270   return TLSv1_method();
    271 }
    272 
    273 const SSL_METHOD *SSLv3_client_method(void) {
    274   return SSLv3_method();
    275 }
    276 
    277 const SSL_METHOD *SSLv23_server_method(void) {
    278   return SSLv23_method();
    279 }
    280 
    281 const SSL_METHOD *SSLv23_client_method(void) {
    282   return SSLv23_method();
    283 }
    284 
    285 const SSL_METHOD *TLS_server_method(void) {
    286   return TLS_method();
    287 }
    288 
    289 const SSL_METHOD *TLS_client_method(void) {
    290   return TLS_method();
    291 }
    292