ssl/ssl_asn1.c

   1 /* ssl/ssl_asn1.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright 2005 Nokia. All rights reserved.
  60  *
  61  * The portions of the attached software ("Contribution") is developed by
  62  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
  63  * license.
  64  *
  65  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
  66  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
  67  * support (see RFC 4279) to OpenSSL.
  68  *
  69  * No patent licenses or other rights except those expressly stated in
  70  * the OpenSSL open source license shall be deemed granted or received
  71  * expressly, by implication, estoppel, or otherwise.
  72  *
  73  * No assurances are provided by Nokia that the Contribution does not
  74  * infringe the patent or other intellectual property rights of any third
  75  * party or that the license provides you with all the necessary rights
  76  * to make use of the Contribution.
  77  *
  78  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
  79  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
  80  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
  81  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
  82  * OTHERWISE.
  83  */
  84
  85 #include <stdio.h>
  86 #include <stdlib.h>
  87 #include "ssl_locl.h"
  88 #include <openssl/asn1t.h>
  89 #include <openssl/x509.h>
  90
  91 typedef struct {
  92     long version;
  93     long ssl_version;
  94     ASN1_OCTET_STRING *cipher;
  95     ASN1_OCTET_STRING *comp_id;
  96     ASN1_OCTET_STRING *master_key;
  97     ASN1_OCTET_STRING *session_id;
  98     ASN1_OCTET_STRING *key_arg;
  99     long time;
 100     long timeout;
 101     X509 *peer;
 102     ASN1_OCTET_STRING *session_id_context;
 103     long verify_result;
 104     ASN1_OCTET_STRING *tlsext_hostname;
 105     long tlsext_tick_lifetime_hint;
 106     ASN1_OCTET_STRING *tlsext_tick;
 107 #ifndef OPENSSL_NO_PSK
 108     ASN1_OCTET_STRING *psk_identity_hint;
 109     ASN1_OCTET_STRING *psk_identity;
 110 #endif
 111 #ifndef OPENSSL_NO_SRP
 112     ASN1_OCTET_STRING *srp_username;
 113 #endif
 114     long flags;
 115 } SSL_SESSION_ASN1;
 116
 117 ASN1_SEQUENCE(SSL_SESSION_ASN1) = {
 118     ASN1_SIMPLE(SSL_SESSION_ASN1, version, LONG),
 119     ASN1_SIMPLE(SSL_SESSION_ASN1, ssl_version, LONG),
 120     ASN1_SIMPLE(SSL_SESSION_ASN1, cipher, ASN1_OCTET_STRING),
 121     ASN1_SIMPLE(SSL_SESSION_ASN1, session_id, ASN1_OCTET_STRING),
 122     ASN1_SIMPLE(SSL_SESSION_ASN1, master_key, ASN1_OCTET_STRING),
 123     ASN1_IMP_OPT(SSL_SESSION_ASN1, key_arg, ASN1_OCTET_STRING, 0),
 124     ASN1_EXP_OPT(SSL_SESSION_ASN1, time, ZLONG, 1),
 125     ASN1_EXP_OPT(SSL_SESSION_ASN1, timeout, ZLONG, 2),
 126     ASN1_EXP_OPT(SSL_SESSION_ASN1, peer, X509, 3),
 127     ASN1_EXP_OPT(SSL_SESSION_ASN1, session_id_context, ASN1_OCTET_STRING, 4),
 128     ASN1_EXP_OPT(SSL_SESSION_ASN1, verify_result, ZLONG, 5),
 129     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_hostname, ASN1_OCTET_STRING, 6),
 130 #ifndef OPENSSL_NO_PSK
 131     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity_hint, ASN1_OCTET_STRING, 7),
 132     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity, ASN1_OCTET_STRING, 8),
 133 #endif
 134     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_tick_lifetime_hint, ZLONG, 9),
 135     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_tick, ASN1_OCTET_STRING, 10),
 136     ASN1_EXP_OPT(SSL_SESSION_ASN1, comp_id, ASN1_OCTET_STRING, 11),
 137 #ifndef OPENSSL_NO_SRP
 138     ASN1_EXP_OPT(SSL_SESSION_ASN1, srp_username, ASN1_OCTET_STRING, 12),
 139 #endif
 140     ASN1_EXP_OPT(SSL_SESSION_ASN1, flags, ZLONG, 13)
 141 } static_ASN1_SEQUENCE_END(SSL_SESSION_ASN1)
 142
 143 IMPLEMENT_STATIC_ASN1_ENCODE_FUNCTIONS(SSL_SESSION_ASN1)
 144
 145 /* Utility functions for i2d_SSL_SESSION */
 146
 147 /* Initialise OCTET STRING from buffer and length */
 148
 149 static void ssl_session_oinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
 150                               unsigned char *data, size_t len)
 151 {
 152     os->data = data;
 153     os->length = len;
 154     os->flags = 0;
 155     *dest = os;
 156 }
 157
 158 /* Initialise OCTET STRING from string */
 159 static void ssl_session_sinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
 160                               char *data)
 161 {
 162     if (data != NULL)
 163         ssl_session_oinit(dest, os, (unsigned char *)data, strlen(data));
 164     else
 165         *dest = NULL;
 166 }
 167
 168 int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
 169 {
 170
 171     SSL_SESSION_ASN1 as;
 172
 173     ASN1_OCTET_STRING cipher;
 174     unsigned char cipher_data[2];
 175     ASN1_OCTET_STRING master_key, session_id, sid_ctx;
 176
 177 #ifndef OPENSSL_NO_COMP
 178     ASN1_OCTET_STRING comp_id;
 179     unsigned char comp_id_data;
 180 #endif
 181
 182     ASN1_OCTET_STRING tlsext_hostname, tlsext_tick;
 183
 184 #ifndef OPENSSL_NO_SRP
 185     ASN1_OCTET_STRING srp_username;
 186 #endif
 187
 188 #ifndef OPENSSL_NO_PSK
 189     ASN1_OCTET_STRING psk_identity, psk_identity_hint;
 190 #endif
 191
 192     long l;
 193
 194     if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
 195         return 0;
 196
 197     memset(&as, 0, sizeof(as));
 198
 199     as.version = SSL_SESSION_ASN1_VERSION;
 200     as.ssl_version = in->ssl_version;
 201
 202     if (in->cipher == NULL)
 203         l = in->cipher_id;
 204     else
 205         l = in->cipher->id;
 206     cipher_data[0] = ((unsigned char)(l >> 8L)) & 0xff;
 207     cipher_data[1] = ((unsigned char)(l)) & 0xff;
 208
 209     ssl_session_oinit(&as.cipher, &cipher, cipher_data, 2);
 210
 211 #ifndef OPENSSL_NO_COMP
 212     if (in->compress_meth) {
 213         comp_id_data = (unsigned char)in->compress_meth;
 214         ssl_session_oinit(&as.comp_id, &comp_id, &comp_id_data, 1);
 215     }
 216 #endif
 217
 218     ssl_session_oinit(&as.master_key, &master_key,
 219                       in->master_key, in->master_key_length);
 220
 221     ssl_session_oinit(&as.session_id, &session_id,
 222                       in->session_id, in->session_id_length);
 223
 224     ssl_session_oinit(&as.session_id_context, &sid_ctx,
 225                       in->sid_ctx, in->sid_ctx_length);
 226
 227     as.time = in->time;
 228     as.timeout = in->timeout;
 229     as.verify_result = in->verify_result;
 230
 231     as.peer = in->peer;
 232
 233     ssl_session_sinit(&as.tlsext_hostname, &tlsext_hostname,
 234                       in->tlsext_hostname);
 235     if (in->tlsext_tick) {
 236         ssl_session_oinit(&as.tlsext_tick, &tlsext_tick,
 237                           in->tlsext_tick, in->tlsext_ticklen);
 238     }
 239     if (in->tlsext_tick_lifetime_hint > 0)
 240         as.tlsext_tick_lifetime_hint = in->tlsext_tick_lifetime_hint;
 241 #ifndef OPENSSL_NO_PSK
 242     ssl_session_sinit(&as.psk_identity_hint, &psk_identity_hint,
 243                       in->psk_identity_hint);
 244     ssl_session_sinit(&as.psk_identity, &psk_identity, in->psk_identity);
 245 #endif                          /* OPENSSL_NO_PSK */
 246 #ifndef OPENSSL_NO_SRP
 247     ssl_session_sinit(&as.srp_username, &srp_username, in->srp_username);
 248 #endif                          /* OPENSSL_NO_SRP */
 249
 250     as.flags = in->flags;
 251
 252     return i2d_SSL_SESSION_ASN1(&as, pp);
 253
 254 }
 255
 256 /* Utility functions for d2i_SSL_SESSION */
 257
 258 /* OPENSSL_strndup an OCTET STRING */
 259
 260 static int ssl_session_strndup(char **pdst, ASN1_OCTET_STRING *src)
 261 {
 262     OPENSSL_free(*pdst);
 263     *pdst = NULL;
 264     if (src == NULL)
 265         return 1;
 266     *pdst = OPENSSL_strndup((char *)src->data, src->length);
 267     if (*pdst == NULL)
 268         return 0;
 269     return 1;
 270 }
 271
 272 /* Copy an OCTET STRING, return error if it exceeds maximum length */
 273
 274 static int ssl_session_memcpy(unsigned char *dst, unsigned int *pdstlen,
 275                               ASN1_OCTET_STRING *src, int maxlen)
 276 {
 277     if (src == NULL) {
 278         *pdstlen = 0;
 279         return 1;
 280     }
 281     if (src->length > maxlen)
 282         return 0;
 283     memcpy(dst, src->data, src->length);
 284     *pdstlen = src->length;
 285     return 1;
 286 }
 287
 288 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
 289                              long length)
 290 {
 291     long id;
 292     unsigned int tmpl;
 293     const unsigned char *p = *pp;
 294     SSL_SESSION_ASN1 *as = NULL;
 295     SSL_SESSION *ret = NULL;
 296
 297     as = d2i_SSL_SESSION_ASN1(NULL, &p, length);
 298     /* ASN.1 code returns suitable error */
 299     if (as == NULL)
 300         goto err;
 301
 302     if (!a || !*a) {
 303         ret = SSL_SESSION_new();
 304         if (ret == NULL)
 305             goto err;
 306     } else {
 307         ret = *a;
 308     }
 309
 310     if (as->version != SSL_SESSION_ASN1_VERSION) {
 311         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_UNKNOWN_SSL_VERSION);
 312         goto err;
 313     }
 314
 315     if ((as->ssl_version >> 8) != SSL3_VERSION_MAJOR
 316         && (as->ssl_version >> 8) != DTLS1_VERSION_MAJOR
 317         && as->ssl_version != DTLS1_BAD_VER) {
 318         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_UNSUPPORTED_SSL_VERSION);
 319         goto err;
 320     }
 321
 322     ret->ssl_version = (int)as->ssl_version;
 323
 324     if (as->cipher->length != 2) {
 325         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_CIPHER_CODE_WRONG_LENGTH);
 326         goto err;
 327     }
 328
 329     p = as->cipher->data;
 330     id = 0x03000000L | ((unsigned long)p[0] << 8L) | (unsigned long)p[1];
 331
 332     ret->cipher = NULL;
 333     ret->cipher_id = id;
 334
 335     if (!ssl_session_memcpy(ret->session_id, &ret->session_id_length,
 336                             as->session_id, SSL3_MAX_SSL_SESSION_ID_LENGTH))
 337         goto err;
 338
 339     if (!ssl_session_memcpy(ret->master_key, &tmpl,
 340                             as->master_key, SSL_MAX_MASTER_KEY_LENGTH))
 341         goto err;
 342
 343     ret->master_key_length = tmpl;
 344
 345     if (as->time != 0)
 346         ret->time = as->time;
 347     else
 348         ret->time = (unsigned long)time(NULL);
 349
 350     if (as->timeout != 0)
 351         ret->timeout = as->timeout;
 352     else
 353         ret->timeout = 3;
 354
 355     X509_free(ret->peer);
 356     ret->peer = as->peer;
 357     as->peer = NULL;
 358
 359     if (!ssl_session_memcpy(ret->sid_ctx, &ret->sid_ctx_length,
 360                             as->session_id_context, SSL_MAX_SID_CTX_LENGTH))
 361         goto err;
 362
 363     /* NB: this defaults to zero which is X509_V_OK */
 364     ret->verify_result = as->verify_result;
 365
 366     if (!ssl_session_strndup(&ret->tlsext_hostname, as->tlsext_hostname))
 367         goto err;
 368
 369 #ifndef OPENSSL_NO_PSK
 370     if (!ssl_session_strndup(&ret->psk_identity_hint, as->psk_identity_hint))
 371         goto err;
 372     if (!ssl_session_strndup(&ret->psk_identity, as->psk_identity))
 373         goto err;
 374 #endif
 375
 376     ret->tlsext_tick_lifetime_hint = as->tlsext_tick_lifetime_hint;
 377     if (as->tlsext_tick) {
 378         ret->tlsext_tick = as->tlsext_tick->data;
 379         ret->tlsext_ticklen = as->tlsext_tick->length;
 380         as->tlsext_tick->data = NULL;
 381     } else {
 382         ret->tlsext_tick = NULL;
 383     }
 384 #ifndef OPENSSL_NO_COMP
 385     if (as->comp_id) {
 386         if (as->comp_id->length != 1) {
 387             SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_BAD_LENGTH);
 388             goto err;
 389         }
 390         ret->compress_meth = as->comp_id->data[0];
 391     } else {
 392         ret->compress_meth = 0;
 393     }
 394 #endif
 395
 396 #ifndef OPENSSL_NO_SRP
 397     if (!ssl_session_strndup(&ret->srp_username, as->srp_username))
 398         goto err;
 399 #endif                          /* OPENSSL_NO_SRP */
 400     /* Flags defaults to zero which is fine */
 401     ret->flags = as->flags;
 402
 403     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 404
 405     if ((a != NULL) && (*a == NULL))
 406         *a = ret;
 407     *pp = p;
 408     return ret;
 409
 410     err:
 411     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 412     if ((a == NULL) || (*a != ret))
 413         SSL_SESSION_free(ret);
 414     return NULL;
 415 }