crypto/ts/ts_rsp_sign.c

   1 /* crypto/ts/ts_resp_sign.c */
   2 /*
   3  * Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL project
   4  * 2002.
   5  */
   6 /* ====================================================================
   7  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  *
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  *
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in
  18  *    the documentation and/or other materials provided with the
  19  *    distribution.
  20  *
  21  * 3. All advertising materials mentioning features or use of this
  22  *    software must display the following acknowledgment:
  23  *    "This product includes software developed by the OpenSSL Project
  24  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  25  *
  26  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  27  *    endorse or promote products derived from this software without
  28  *    prior written permission. For written permission, please contact
  29  *    licensing@OpenSSL.org.
  30  *
  31  * 5. Products derived from this software may not be called "OpenSSL"
  32  *    nor may "OpenSSL" appear in their names without prior written
  33  *    permission of the OpenSSL Project.
  34  *
  35  * 6. Redistributions of any form whatsoever must retain the following
  36  *    acknowledgment:
  37  *    "This product includes software developed by the OpenSSL Project
  38  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  41  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  43  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  44  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  45  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  46  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  47  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  49  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  50  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  51  * OF THE POSSIBILITY OF SUCH DAMAGE.
  52  * ====================================================================
  53  *
  54  * This product includes cryptographic software written by Eric Young
  55  * (eay@cryptsoft.com).  This product includes software written by Tim
  56  * Hudson (tjh@cryptsoft.com).
  57  *
  58  */
  59
  60 #include "internal/cryptlib.h"
  61
  62 #if defined(OPENSSL_SYS_UNIX)
  63 # include <sys/time.h>
  64 #endif
  65
  66 #include <openssl/objects.h>
  67 #include <openssl/ts.h>
  68 #include <openssl/pkcs7.h>
  69 #include "ts_lcl.h"
  70
  71 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
  72 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
  73 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  74
  75 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
  76 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
  77 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
  78 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
  79 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
  80                                             ASN1_OBJECT *policy);
  81 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
  82 static int ts_RESP_sign(TS_RESP_CTX *ctx);
  83
  84 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert,
  85                                                    STACK_OF(X509) *certs);
  86 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed);
  87 static int ts_TST_INFO_content_new(PKCS7 *p7);
  88 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
  89
  90 static ASN1_GENERALIZEDTIME
  91 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
  92                                     unsigned);
  93
  94 /* Default callback for response generation. */
  95 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
  96 {
  97     ASN1_INTEGER *serial = ASN1_INTEGER_new();
  98
  99     if (!serial)
 100         goto err;
 101     if (!ASN1_INTEGER_set(serial, 1))
 102         goto err;
 103     return serial;
 104
 105  err:
 106     TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
 107     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 108                                 "Error during serial number generation.");
 109     return NULL;
 110 }
 111
 112 #if defined(OPENSSL_SYS_UNIX)
 113
 114 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
 115                        long *sec, long *usec)
 116 {
 117     struct timeval tv;
 118     if (gettimeofday(&tv, NULL) != 0) {
 119         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
 120         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 121                                     "Time is not available.");
 122         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
 123         return 0;
 124     }
 125     *sec = tv.tv_sec;
 126     *usec = tv.tv_usec;
 127
 128     return 1;
 129 }
 130
 131 #else
 132
 133 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
 134                        long *sec, long *usec)
 135 {
 136     time_t t;
 137     if (time(&t) == (time_t)-1) {
 138         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
 139         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 140                                     "Time is not available.");
 141         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
 142         return 0;
 143     }
 144     *sec = (long)t;
 145     *usec = 0;
 146
 147     return 1;
 148 }
 149
 150 #endif
 151
 152 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
 153                             void *data)
 154 {
 155     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 156                                 "Unsupported extension.");
 157     TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
 158     return 0;
 159 }
 160
 161 /* TS_RESP_CTX management functions. */
 162
 163 TS_RESP_CTX *TS_RESP_CTX_new()
 164 {
 165     TS_RESP_CTX *ctx;
 166
 167     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
 168         TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
 169         return NULL;
 170     }
 171
 172     ctx->serial_cb = def_serial_cb;
 173     ctx->time_cb = def_time_cb;
 174     ctx->extension_cb = def_extension_cb;
 175
 176     return ctx;
 177 }
 178
 179 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
 180 {
 181     if (!ctx)
 182         return;
 183
 184     X509_free(ctx->signer_cert);
 185     EVP_PKEY_free(ctx->signer_key);
 186     sk_X509_pop_free(ctx->certs, X509_free);
 187     sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
 188     ASN1_OBJECT_free(ctx->default_policy);
 189     sk_EVP_MD_free(ctx->mds);   /* No EVP_MD_free method exists. */
 190     ASN1_INTEGER_free(ctx->seconds);
 191     ASN1_INTEGER_free(ctx->millis);
 192     ASN1_INTEGER_free(ctx->micros);
 193     OPENSSL_free(ctx);
 194 }
 195
 196 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
 197 {
 198     if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
 199         TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
 200               TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
 201         return 0;
 202     }
 203     X509_free(ctx->signer_cert);
 204     ctx->signer_cert = signer;
 205     X509_up_ref(ctx->signer_cert);
 206     return 1;
 207 }
 208
 209 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
 210 {
 211     EVP_PKEY_free(ctx->signer_key);
 212     ctx->signer_key = key;
 213     CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
 214
 215     return 1;
 216 }
 217
 218 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
 219 {
 220     ASN1_OBJECT_free(ctx->default_policy);
 221     if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
 222         goto err;
 223     return 1;
 224  err:
 225     TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
 226     return 0;
 227 }
 228
 229 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
 230 {
 231
 232     sk_X509_pop_free(ctx->certs, X509_free);
 233     ctx->certs = NULL;
 234     if (!certs)
 235         return 1;
 236     if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) {
 237         TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
 238         return 0;
 239     }
 240
 241     return 1;
 242 }
 243
 244 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
 245 {
 246     ASN1_OBJECT *copy = NULL;
 247
 248     if (ctx->policies == NULL
 249         && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
 250         goto err;
 251     if ((copy = OBJ_dup(policy)) == NULL)
 252         goto err;
 253     if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
 254         goto err;
 255
 256     return 1;
 257  err:
 258     TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
 259     ASN1_OBJECT_free(copy);
 260     return 0;
 261 }
 262
 263 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
 264 {
 265     if (ctx->mds == NULL
 266         && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
 267         goto err;
 268     if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md))
 269         goto err;
 270
 271     return 1;
 272  err:
 273     TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
 274     return 0;
 275 }
 276
 277 #define TS_RESP_CTX_accuracy_free(ctx)          \
 278         ASN1_INTEGER_free(ctx->seconds);        \
 279         ctx->seconds = NULL;                    \
 280         ASN1_INTEGER_free(ctx->millis);         \
 281         ctx->millis = NULL;                     \
 282         ASN1_INTEGER_free(ctx->micros);         \
 283         ctx->micros = NULL;
 284
 285 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
 286                              int secs, int millis, int micros)
 287 {
 288
 289     TS_RESP_CTX_accuracy_free(ctx);
 290     if (secs
 291         && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
 292             || !ASN1_INTEGER_set(ctx->seconds, secs)))
 293         goto err;
 294     if (millis
 295         && ((ctx->millis = ASN1_INTEGER_new()) == NULL
 296             || !ASN1_INTEGER_set(ctx->millis, millis)))
 297         goto err;
 298     if (micros
 299         && ((ctx->micros = ASN1_INTEGER_new()) == NULL
 300             || !ASN1_INTEGER_set(ctx->micros, micros)))
 301         goto err;
 302
 303     return 1;
 304  err:
 305     TS_RESP_CTX_accuracy_free(ctx);
 306     TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
 307     return 0;
 308 }
 309
 310 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
 311 {
 312     ctx->flags |= flags;
 313 }
 314
 315 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
 316 {
 317     ctx->serial_cb = cb;
 318     ctx->serial_cb_data = data;
 319 }
 320
 321 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
 322 {
 323     ctx->time_cb = cb;
 324     ctx->time_cb_data = data;
 325 }
 326
 327 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
 328                                   TS_extension_cb cb, void *data)
 329 {
 330     ctx->extension_cb = cb;
 331     ctx->extension_cb_data = data;
 332 }
 333
 334 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
 335                                 int status, const char *text)
 336 {
 337     TS_STATUS_INFO *si = NULL;
 338     ASN1_UTF8STRING *utf8_text = NULL;
 339     int ret = 0;
 340
 341     if ((si = TS_STATUS_INFO_new()) == NULL)
 342         goto err;
 343     if (!ASN1_INTEGER_set(si->status, status))
 344         goto err;
 345     if (text) {
 346         if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
 347             || !ASN1_STRING_set(utf8_text, text, strlen(text)))
 348             goto err;
 349         if (si->text == NULL
 350             && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
 351             goto err;
 352         if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
 353             goto err;
 354         utf8_text = NULL;       /* Ownership is lost. */
 355     }
 356     if (!TS_RESP_set_status_info(ctx->response, si))
 357         goto err;
 358     ret = 1;
 359  err:
 360     if (!ret)
 361         TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
 362     TS_STATUS_INFO_free(si);
 363     ASN1_UTF8STRING_free(utf8_text);
 364     return ret;
 365 }
 366
 367 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
 368                                      int status, const char *text)
 369 {
 370     int ret = 1;
 371     TS_STATUS_INFO *si = ctx->response->status_info;
 372
 373     if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
 374         ret = TS_RESP_CTX_set_status_info(ctx, status, text);
 375     }
 376     return ret;
 377 }
 378
 379 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
 380 {
 381     TS_STATUS_INFO *si = ctx->response->status_info;
 382     if (si->failure_info == NULL
 383         && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
 384         goto err;
 385     if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
 386         goto err;
 387     return 1;
 388  err:
 389     TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
 390     return 0;
 391 }
 392
 393 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
 394 {
 395     return ctx->request;
 396 }
 397
 398 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
 399 {
 400     return ctx->tst_info;
 401 }
 402
 403 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
 404                                            unsigned precision)
 405 {
 406     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 407         return 0;
 408     ctx->clock_precision_digits = precision;
 409     return 1;
 410 }
 411
 412 /* Main entry method of the response generation. */
 413 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
 414 {
 415     ASN1_OBJECT *policy;
 416     TS_RESP *response;
 417     int result = 0;
 418
 419     ts_RESP_CTX_init(ctx);
 420
 421     if ((ctx->response = TS_RESP_new()) == NULL) {
 422         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
 423         goto end;
 424     }
 425     if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
 426         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 427                                     "Bad request format or system error.");
 428         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 429         goto end;
 430     }
 431     if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
 432         goto end;
 433     if (!ts_RESP_check_request(ctx))
 434         goto end;
 435     if ((policy = ts_RESP_get_policy(ctx)) == NULL)
 436         goto end;
 437     if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
 438         goto end;
 439     if (!ts_RESP_process_extensions(ctx))
 440         goto end;
 441     if (!ts_RESP_sign(ctx))
 442         goto end;
 443     result = 1;
 444
 445  end:
 446     if (!result) {
 447         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
 448         if (ctx->response != NULL) {
 449             if (TS_RESP_CTX_set_status_info_cond(ctx,
 450                                                  TS_STATUS_REJECTION,
 451                                                  "Error during response "
 452                                                  "generation.") == 0) {
 453                 TS_RESP_free(ctx->response);
 454                 ctx->response = NULL;
 455             }
 456         }
 457     }
 458     response = ctx->response;
 459     ctx->response = NULL;       /* Ownership will be returned to caller. */
 460     ts_RESP_CTX_cleanup(ctx);
 461     return response;
 462 }
 463
 464 /* Initializes the variable part of the context. */
 465 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
 466 {
 467     ctx->request = NULL;
 468     ctx->response = NULL;
 469     ctx->tst_info = NULL;
 470 }
 471
 472 /* Cleans up the variable part of the context. */
 473 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
 474 {
 475     TS_REQ_free(ctx->request);
 476     ctx->request = NULL;
 477     TS_RESP_free(ctx->response);
 478     ctx->response = NULL;
 479     TS_TST_INFO_free(ctx->tst_info);
 480     ctx->tst_info = NULL;
 481 }
 482
 483 /* Checks the format and content of the request. */
 484 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
 485 {
 486     TS_REQ *request = ctx->request;
 487     TS_MSG_IMPRINT *msg_imprint;
 488     X509_ALGOR *md_alg;
 489     int md_alg_id;
 490     const ASN1_OCTET_STRING *digest;
 491     EVP_MD *md = NULL;
 492     int i;
 493
 494     if (TS_REQ_get_version(request) != 1) {
 495         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 496                                     "Bad request version.");
 497         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
 498         return 0;
 499     }
 500
 501     msg_imprint = request->msg_imprint;
 502     md_alg = msg_imprint->hash_algo;
 503     md_alg_id = OBJ_obj2nid(md_alg->algorithm);
 504     for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
 505         EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
 506         if (md_alg_id == EVP_MD_type(current_md))
 507             md = current_md;
 508     }
 509     if (!md) {
 510         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 511                                     "Message digest algorithm is "
 512                                     "not supported.");
 513         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 514         return 0;
 515     }
 516
 517     if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
 518         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 519                                     "Superfluous message digest "
 520                                     "parameter.");
 521         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 522         return 0;
 523     }
 524     digest = msg_imprint->hashed_msg;
 525     if (digest->length != EVP_MD_size(md)) {
 526         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 527                                     "Bad message digest.");
 528         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 529         return 0;
 530     }
 531
 532     return 1;
 533 }
 534
 535 /* Returns the TSA policy based on the requested and acceptable policies. */
 536 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
 537 {
 538     ASN1_OBJECT *requested = ctx->request->policy_id;
 539     ASN1_OBJECT *policy = NULL;
 540     int i;
 541
 542     if (ctx->default_policy == NULL) {
 543         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
 544         return NULL;
 545     }
 546     if (!requested || !OBJ_cmp(requested, ctx->default_policy))
 547         policy = ctx->default_policy;
 548
 549     /* Check if the policy is acceptable. */
 550     for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
 551         ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
 552         if (!OBJ_cmp(requested, current))
 553             policy = current;
 554     }
 555     if (!policy) {
 556         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
 557         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 558                                     "Requested policy is not " "supported.");
 559         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
 560     }
 561     return policy;
 562 }
 563
 564 /* Creates the TS_TST_INFO object based on the settings of the context. */
 565 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
 566                                             ASN1_OBJECT *policy)
 567 {
 568     int result = 0;
 569     TS_TST_INFO *tst_info = NULL;
 570     ASN1_INTEGER *serial = NULL;
 571     ASN1_GENERALIZEDTIME *asn1_time = NULL;
 572     long sec, usec;
 573     TS_ACCURACY *accuracy = NULL;
 574     const ASN1_INTEGER *nonce;
 575     GENERAL_NAME *tsa_name = NULL;
 576
 577     if ((tst_info = TS_TST_INFO_new()) == NULL)
 578         goto end;
 579     if (!TS_TST_INFO_set_version(tst_info, 1))
 580         goto end;
 581     if (!TS_TST_INFO_set_policy_id(tst_info, policy))
 582         goto end;
 583     if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
 584         goto end;
 585     if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
 586         || !TS_TST_INFO_set_serial(tst_info, serial))
 587         goto end;
 588     if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
 589         || (asn1_time =
 590             TS_RESP_set_genTime_with_precision(NULL, sec, usec,
 591                                         ctx->clock_precision_digits)) == NULL
 592         || !TS_TST_INFO_set_time(tst_info, asn1_time))
 593         goto end;
 594
 595     if ((ctx->seconds || ctx->millis || ctx->micros)
 596         && (accuracy = TS_ACCURACY_new()) == NULL)
 597         goto end;
 598     if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
 599         goto end;
 600     if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
 601         goto end;
 602     if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
 603         goto end;
 604     if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
 605         goto end;
 606
 607     if ((ctx->flags & TS_ORDERING)
 608         && !TS_TST_INFO_set_ordering(tst_info, 1))
 609         goto end;
 610
 611     if ((nonce = ctx->request->nonce) != NULL
 612         && !TS_TST_INFO_set_nonce(tst_info, nonce))
 613         goto end;
 614
 615     if (ctx->flags & TS_TSA_NAME) {
 616         if ((tsa_name = GENERAL_NAME_new()) == NULL)
 617             goto end;
 618         tsa_name->type = GEN_DIRNAME;
 619         tsa_name->d.dirn =
 620             X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
 621         if (!tsa_name->d.dirn)
 622             goto end;
 623         if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
 624             goto end;
 625     }
 626
 627     result = 1;
 628  end:
 629     if (!result) {
 630         TS_TST_INFO_free(tst_info);
 631         tst_info = NULL;
 632         TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
 633         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 634                                          "Error during TSTInfo "
 635                                          "generation.");
 636     }
 637     GENERAL_NAME_free(tsa_name);
 638     TS_ACCURACY_free(accuracy);
 639     ASN1_GENERALIZEDTIME_free(asn1_time);
 640     ASN1_INTEGER_free(serial);
 641
 642     return tst_info;
 643 }
 644
 645 /* Processing the extensions of the request. */
 646 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
 647 {
 648     STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
 649     int i;
 650     int ok = 1;
 651
 652     for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
 653         X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
 654         /*
 655          * The last argument was previously (void *)ctx->extension_cb,
 656          * but ISO C doesn't permit converting a function pointer to void *.
 657          * For lack of better information, I'm placing a NULL there instead.
 658          * The callback can pick its own address out from the ctx anyway...
 659          */
 660         ok = (*ctx->extension_cb) (ctx, ext, NULL);
 661     }
 662
 663     return ok;
 664 }
 665
 666 /* Functions for signing the TS_TST_INFO structure of the context. */
 667 static int ts_RESP_sign(TS_RESP_CTX *ctx)
 668 {
 669     int ret = 0;
 670     PKCS7 *p7 = NULL;
 671     PKCS7_SIGNER_INFO *si;
 672     STACK_OF(X509) *certs;      /* Certificates to include in sc. */
 673     ESS_SIGNING_CERT *sc = NULL;
 674     ASN1_OBJECT *oid;
 675     BIO *p7bio = NULL;
 676     int i;
 677
 678     if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
 679         TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 680         goto err;
 681     }
 682
 683     if ((p7 = PKCS7_new()) == NULL) {
 684         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 685         goto err;
 686     }
 687     if (!PKCS7_set_type(p7, NID_pkcs7_signed))
 688         goto err;
 689     if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
 690         goto err;
 691
 692     if (ctx->request->cert_req) {
 693         PKCS7_add_certificate(p7, ctx->signer_cert);
 694         if (ctx->certs) {
 695             for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
 696                 X509 *cert = sk_X509_value(ctx->certs, i);
 697                 PKCS7_add_certificate(p7, cert);
 698             }
 699         }
 700     }
 701
 702     if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
 703                                   ctx->signer_key, EVP_sha1())) == NULL) {
 704         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
 705         goto err;
 706     }
 707
 708     oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 709     if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 710                                     V_ASN1_OBJECT, oid)) {
 711         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
 712         goto err;
 713     }
 714
 715     certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
 716     if ((sc = ess_SIGNING_CERT_new_init(ctx->signer_cert, certs)) == NULL)
 717         goto err;
 718     if (!ESS_add_signing_cert(si, sc)) {
 719         TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
 720         goto err;
 721     }
 722
 723     if (!ts_TST_INFO_content_new(p7))
 724         goto err;
 725     if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
 726         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 727         goto err;
 728     }
 729     if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
 730         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 731         goto err;
 732     }
 733     if (!PKCS7_dataFinal(p7, p7bio)) {
 734         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 735         goto err;
 736     }
 737     TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
 738     p7 = NULL;                  /* Ownership is lost. */
 739     ctx->tst_info = NULL;       /* Ownership is lost. */
 740
 741     ret = 1;
 742  err:
 743     if (!ret)
 744         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 745                                          "Error during signature "
 746                                          "generation.");
 747     BIO_free_all(p7bio);
 748     ESS_SIGNING_CERT_free(sc);
 749     PKCS7_free(p7);
 750     return ret;
 751 }
 752
 753 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert,
 754                                                    STACK_OF(X509) *certs)
 755 {
 756     ESS_CERT_ID *cid;
 757     ESS_SIGNING_CERT *sc = NULL;
 758     int i;
 759
 760     if ((sc = ESS_SIGNING_CERT_new()) == NULL)
 761         goto err;
 762     if (sc->cert_ids == NULL
 763         && (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL)
 764         goto err;
 765
 766     if ((cid = ess_CERT_ID_new_init(signcert, 0)) == NULL
 767         || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
 768         goto err;
 769     for (i = 0; i < sk_X509_num(certs); ++i) {
 770         X509 *cert = sk_X509_value(certs, i);
 771         if ((cid = ess_CERT_ID_new_init(cert, 1)) == NULL
 772             || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
 773             goto err;
 774     }
 775
 776     return sc;
 777  err:
 778     ESS_SIGNING_CERT_free(sc);
 779     TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
 780     return NULL;
 781 }
 782
 783 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed)
 784 {
 785     ESS_CERT_ID *cid = NULL;
 786     GENERAL_NAME *name = NULL;
 787     unsigned char cert_sha1[SHA_DIGEST_LENGTH];
 788
 789     X509_check_purpose(cert, -1, 0);
 790     if ((cid = ESS_CERT_ID_new()) == NULL)
 791         goto err;
 792     X509_digest(cert, EVP_sha1(), cert_sha1, NULL);
 793     if (!ASN1_OCTET_STRING_set(cid->hash, cert_sha1, SHA_DIGEST_LENGTH))
 794         goto err;
 795
 796     /* Setting the issuer/serial if requested. */
 797     if (issuer_needed) {
 798         if (cid->issuer_serial == NULL
 799             && (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
 800             goto err;
 801         if ((name = GENERAL_NAME_new()) == NULL)
 802             goto err;
 803         name->type = GEN_DIRNAME;
 804         if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
 805             goto err;
 806         if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
 807             goto err;
 808         name = NULL;            /* Ownership is lost. */
 809         ASN1_INTEGER_free(cid->issuer_serial->serial);
 810         if (!(cid->issuer_serial->serial =
 811               ASN1_INTEGER_dup(X509_get_serialNumber(cert))))
 812             goto err;
 813     }
 814
 815     return cid;
 816  err:
 817     GENERAL_NAME_free(name);
 818     ESS_CERT_ID_free(cid);
 819     TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
 820     return NULL;
 821 }
 822
 823 static int ts_TST_INFO_content_new(PKCS7 *p7)
 824 {
 825     PKCS7 *ret = NULL;
 826     ASN1_OCTET_STRING *octet_string = NULL;
 827
 828     /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
 829     if ((ret = PKCS7_new()) == NULL)
 830         goto err;
 831     if ((ret->d.other = ASN1_TYPE_new()) == NULL)
 832         goto err;
 833     ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 834     if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
 835         goto err;
 836     ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
 837     octet_string = NULL;
 838
 839     /* Add encapsulated content to signed PKCS7 structure. */
 840     if (!PKCS7_set_content(p7, ret))
 841         goto err;
 842
 843     return 1;
 844  err:
 845     ASN1_OCTET_STRING_free(octet_string);
 846     PKCS7_free(ret);
 847     return 0;
 848 }
 849
 850 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
 851 {
 852     ASN1_STRING *seq = NULL;
 853     unsigned char *p, *pp = NULL;
 854     int len;
 855
 856     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 857     if ((pp = OPENSSL_malloc(len)) == NULL) {
 858         TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 859         goto err;
 860     }
 861     p = pp;
 862     i2d_ESS_SIGNING_CERT(sc, &p);
 863     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 864         TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 865         goto err;
 866     }
 867     OPENSSL_free(pp);
 868     pp = NULL;
 869     return PKCS7_add_signed_attribute(si,
 870                                       NID_id_smime_aa_signingCertificate,
 871                                       V_ASN1_SEQUENCE, seq);
 872  err:
 873     ASN1_STRING_free(seq);
 874     OPENSSL_free(pp);
 875
 876     return 0;
 877 }
 878
 879 static ASN1_GENERALIZEDTIME
 880 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
 881                                     long sec, long usec, unsigned precision)
 882 {
 883     time_t time_sec = (time_t)sec;
 884     struct tm *tm = NULL;
 885     char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
 886     char *p = genTime_str;
 887     char *p_end = genTime_str + sizeof(genTime_str);
 888
 889     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 890         goto err;
 891
 892     if ((tm = gmtime(&time_sec)) == NULL)
 893         goto err;
 894
 895     /*
 896      * Put "genTime_str" in GeneralizedTime format.  We work around the
 897      * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
 898      * NOT include fractional seconds") and OpenSSL related functions to
 899      * meet the rfc3161 requirement: "GeneralizedTime syntax can include
 900      * fraction-of-second details".
 901      */
 902     p += BIO_snprintf(p, p_end - p,
 903                       "%04d%02d%02d%02d%02d%02d",
 904                       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 905                       tm->tm_hour, tm->tm_min, tm->tm_sec);
 906     if (precision > 0) {
 907         BIO_snprintf(p, 2 + precision, ".%06ld", usec);
 908         p += strlen(p);
 909
 910         /*
 911          * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
 912          * following restrictions for a DER-encoding, which OpenSSL
 913          * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
 914          * support: "The encoding MUST terminate with a "Z" (which means
 915          * "Zulu" time). The decimal point element, if present, MUST be the
 916          * point option ".". The fractional-seconds elements, if present,
 917          * MUST omit all trailing 0's; if the elements correspond to 0, they
 918          * MUST be wholly omitted, and the decimal point element also MUST be
 919          * omitted."
 920          */
 921         /*
 922          * Remove trailing zeros. The dot guarantees the exit condition of
 923          * this loop even if all the digits are zero.
 924          */
 925         while (*--p == '0')
 926              continue;
 927         if (*p != '.')
 928             ++p;
 929     }
 930     *p++ = 'Z';
 931     *p++ = '\0';
 932
 933     if (asn1_time == NULL
 934         && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
 935         goto err;
 936     if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
 937         ASN1_GENERALIZEDTIME_free(asn1_time);
 938         goto err;
 939     }
 940     return asn1_time;
 941
 942  err:
 943     TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
 944     return NULL;
 945 }