crypto/ts/ts_rsp_sign.c

   1 /*
   2  * Copyright 2006-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include "e_os.h"
  11 #include "internal/cryptlib.h"
  12
  13 #include <openssl/objects.h>
  14 #include <openssl/ts.h>
  15 #include <openssl/pkcs7.h>
  16 #include <openssl/crypto.h>
  17 #include "ts_local.h"
  18 #include "crypto/ess.h"
  19
  20 DEFINE_STACK_OF(ASN1_UTF8STRING)
  21 DEFINE_STACK_OF(ASN1_OBJECT)
  22 DEFINE_STACK_OF_CONST(EVP_MD)
  23
  24 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
  25 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
  26 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  27
  28 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
  29 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
  30 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
  31 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
  32 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
  33                                             ASN1_OBJECT *policy);
  34 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
  35 static int ts_RESP_sign(TS_RESP_CTX *ctx);
  36
  37 static int ts_TST_INFO_content_new(PKCS7 *p7);
  38
  39 static ASN1_GENERALIZEDTIME
  40 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
  41                                     unsigned);
  42
  43 /* Default callback for response generation. */
  44 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
  45 {
  46     ASN1_INTEGER *serial = ASN1_INTEGER_new();
  47
  48     if (serial == NULL)
  49         goto err;
  50     if (!ASN1_INTEGER_set(serial, 1))
  51         goto err;
  52     return serial;
  53
  54  err:
  55     TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
  56     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  57                                 "Error during serial number generation.");
  58     ASN1_INTEGER_free(serial);
  59     return NULL;
  60 }
  61
  62 #if defined(OPENSSL_SYS_UNIX)
  63
  64 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  65                        long *sec, long *usec)
  66 {
  67     struct timeval tv;
  68     if (gettimeofday(&tv, NULL) != 0) {
  69         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
  70         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  71                                     "Time is not available.");
  72         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  73         return 0;
  74     }
  75     *sec = tv.tv_sec;
  76     *usec = tv.tv_usec;
  77
  78     return 1;
  79 }
  80
  81 #else
  82
  83 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  84                        long *sec, long *usec)
  85 {
  86     time_t t;
  87     if (time(&t) == (time_t)-1) {
  88         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
  89         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  90                                     "Time is not available.");
  91         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  92         return 0;
  93     }
  94     *sec = (long)t;
  95     *usec = 0;
  96
  97     return 1;
  98 }
  99
 100 #endif
 101
 102 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
 103                             void *data)
 104 {
 105     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 106                                 "Unsupported extension.");
 107     TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
 108     return 0;
 109 }
 110
 111 /* TS_RESP_CTX management functions. */
 112
 113 TS_RESP_CTX *TS_RESP_CTX_new(void)
 114 {
 115     TS_RESP_CTX *ctx;
 116
 117     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
 118         TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
 119         return NULL;
 120     }
 121
 122     ctx->signer_md = EVP_sha256();
 123
 124     ctx->serial_cb = def_serial_cb;
 125     ctx->time_cb = def_time_cb;
 126     ctx->extension_cb = def_extension_cb;
 127
 128     return ctx;
 129 }
 130
 131 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
 132 {
 133     if (!ctx)
 134         return;
 135
 136     X509_free(ctx->signer_cert);
 137     EVP_PKEY_free(ctx->signer_key);
 138     sk_X509_pop_free(ctx->certs, X509_free);
 139     sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
 140     ASN1_OBJECT_free(ctx->default_policy);
 141     sk_EVP_MD_free(ctx->mds);   /* No EVP_MD_free method exists. */
 142     ASN1_INTEGER_free(ctx->seconds);
 143     ASN1_INTEGER_free(ctx->millis);
 144     ASN1_INTEGER_free(ctx->micros);
 145     OPENSSL_free(ctx);
 146 }
 147
 148 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
 149 {
 150     if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
 151         TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
 152               TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
 153         return 0;
 154     }
 155     X509_free(ctx->signer_cert);
 156     ctx->signer_cert = signer;
 157     X509_up_ref(ctx->signer_cert);
 158     return 1;
 159 }
 160
 161 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
 162 {
 163     EVP_PKEY_free(ctx->signer_key);
 164     ctx->signer_key = key;
 165     EVP_PKEY_up_ref(ctx->signer_key);
 166
 167     return 1;
 168 }
 169
 170 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 171 {
 172     ctx->signer_md = md;
 173     return 1;
 174 }
 175
 176 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
 177 {
 178     ASN1_OBJECT_free(ctx->default_policy);
 179     if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
 180         goto err;
 181     return 1;
 182  err:
 183     TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
 184     return 0;
 185 }
 186
 187 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
 188 {
 189
 190     sk_X509_pop_free(ctx->certs, X509_free);
 191     ctx->certs = NULL;
 192     if (!certs)
 193         return 1;
 194     if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) {
 195         TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
 196         return 0;
 197     }
 198
 199     return 1;
 200 }
 201
 202 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
 203 {
 204     ASN1_OBJECT *copy = NULL;
 205
 206     if (ctx->policies == NULL
 207         && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
 208         goto err;
 209     if ((copy = OBJ_dup(policy)) == NULL)
 210         goto err;
 211     if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
 212         goto err;
 213
 214     return 1;
 215  err:
 216     TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
 217     ASN1_OBJECT_free(copy);
 218     return 0;
 219 }
 220
 221 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
 222 {
 223     if (ctx->mds == NULL
 224         && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
 225         goto err;
 226     if (!sk_EVP_MD_push(ctx->mds, md))
 227         goto err;
 228
 229     return 1;
 230  err:
 231     TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
 232     return 0;
 233 }
 234
 235 #define TS_RESP_CTX_accuracy_free(ctx)          \
 236         ASN1_INTEGER_free(ctx->seconds);        \
 237         ctx->seconds = NULL;                    \
 238         ASN1_INTEGER_free(ctx->millis);         \
 239         ctx->millis = NULL;                     \
 240         ASN1_INTEGER_free(ctx->micros);         \
 241         ctx->micros = NULL;
 242
 243 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
 244                              int secs, int millis, int micros)
 245 {
 246
 247     TS_RESP_CTX_accuracy_free(ctx);
 248     if (secs
 249         && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
 250             || !ASN1_INTEGER_set(ctx->seconds, secs)))
 251         goto err;
 252     if (millis
 253         && ((ctx->millis = ASN1_INTEGER_new()) == NULL
 254             || !ASN1_INTEGER_set(ctx->millis, millis)))
 255         goto err;
 256     if (micros
 257         && ((ctx->micros = ASN1_INTEGER_new()) == NULL
 258             || !ASN1_INTEGER_set(ctx->micros, micros)))
 259         goto err;
 260
 261     return 1;
 262  err:
 263     TS_RESP_CTX_accuracy_free(ctx);
 264     TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
 265     return 0;
 266 }
 267
 268 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
 269 {
 270     ctx->flags |= flags;
 271 }
 272
 273 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
 274 {
 275     ctx->serial_cb = cb;
 276     ctx->serial_cb_data = data;
 277 }
 278
 279 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
 280 {
 281     ctx->time_cb = cb;
 282     ctx->time_cb_data = data;
 283 }
 284
 285 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
 286                                   TS_extension_cb cb, void *data)
 287 {
 288     ctx->extension_cb = cb;
 289     ctx->extension_cb_data = data;
 290 }
 291
 292 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
 293                                 int status, const char *text)
 294 {
 295     TS_STATUS_INFO *si = NULL;
 296     ASN1_UTF8STRING *utf8_text = NULL;
 297     int ret = 0;
 298
 299     if ((si = TS_STATUS_INFO_new()) == NULL)
 300         goto err;
 301     if (!ASN1_INTEGER_set(si->status, status))
 302         goto err;
 303     if (text) {
 304         if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
 305             || !ASN1_STRING_set(utf8_text, text, strlen(text)))
 306             goto err;
 307         if (si->text == NULL
 308             && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
 309             goto err;
 310         if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
 311             goto err;
 312         utf8_text = NULL;       /* Ownership is lost. */
 313     }
 314     if (!TS_RESP_set_status_info(ctx->response, si))
 315         goto err;
 316     ret = 1;
 317  err:
 318     if (!ret)
 319         TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
 320     TS_STATUS_INFO_free(si);
 321     ASN1_UTF8STRING_free(utf8_text);
 322     return ret;
 323 }
 324
 325 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
 326                                      int status, const char *text)
 327 {
 328     int ret = 1;
 329     TS_STATUS_INFO *si = ctx->response->status_info;
 330
 331     if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
 332         ret = TS_RESP_CTX_set_status_info(ctx, status, text);
 333     }
 334     return ret;
 335 }
 336
 337 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
 338 {
 339     TS_STATUS_INFO *si = ctx->response->status_info;
 340     if (si->failure_info == NULL
 341         && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
 342         goto err;
 343     if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
 344         goto err;
 345     return 1;
 346  err:
 347     TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
 348     return 0;
 349 }
 350
 351 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
 352 {
 353     return ctx->request;
 354 }
 355
 356 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
 357 {
 358     return ctx->tst_info;
 359 }
 360
 361 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
 362                                            unsigned precision)
 363 {
 364     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 365         return 0;
 366     ctx->clock_precision_digits = precision;
 367     return 1;
 368 }
 369
 370 /* Main entry method of the response generation. */
 371 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
 372 {
 373     ASN1_OBJECT *policy;
 374     TS_RESP *response;
 375     int result = 0;
 376
 377     ts_RESP_CTX_init(ctx);
 378
 379     if ((ctx->response = TS_RESP_new()) == NULL) {
 380         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
 381         goto end;
 382     }
 383     if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
 384         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 385                                     "Bad request format or system error.");
 386         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 387         goto end;
 388     }
 389     if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
 390         goto end;
 391     if (!ts_RESP_check_request(ctx))
 392         goto end;
 393     if ((policy = ts_RESP_get_policy(ctx)) == NULL)
 394         goto end;
 395     if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
 396         goto end;
 397     if (!ts_RESP_process_extensions(ctx))
 398         goto end;
 399     if (!ts_RESP_sign(ctx))
 400         goto end;
 401     result = 1;
 402
 403  end:
 404     if (!result) {
 405         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
 406         if (ctx->response != NULL) {
 407             if (TS_RESP_CTX_set_status_info_cond(ctx,
 408                                                  TS_STATUS_REJECTION,
 409                                                  "Error during response "
 410                                                  "generation.") == 0) {
 411                 TS_RESP_free(ctx->response);
 412                 ctx->response = NULL;
 413             }
 414         }
 415     }
 416     response = ctx->response;
 417     ctx->response = NULL;       /* Ownership will be returned to caller. */
 418     ts_RESP_CTX_cleanup(ctx);
 419     return response;
 420 }
 421
 422 /* Initializes the variable part of the context. */
 423 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
 424 {
 425     ctx->request = NULL;
 426     ctx->response = NULL;
 427     ctx->tst_info = NULL;
 428 }
 429
 430 /* Cleans up the variable part of the context. */
 431 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
 432 {
 433     TS_REQ_free(ctx->request);
 434     ctx->request = NULL;
 435     TS_RESP_free(ctx->response);
 436     ctx->response = NULL;
 437     TS_TST_INFO_free(ctx->tst_info);
 438     ctx->tst_info = NULL;
 439 }
 440
 441 /* Checks the format and content of the request. */
 442 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
 443 {
 444     TS_REQ *request = ctx->request;
 445     TS_MSG_IMPRINT *msg_imprint;
 446     X509_ALGOR *md_alg;
 447     int md_alg_id;
 448     const ASN1_OCTET_STRING *digest;
 449     const EVP_MD *md = NULL;
 450     int i;
 451
 452     if (TS_REQ_get_version(request) != 1) {
 453         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 454                                     "Bad request version.");
 455         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
 456         return 0;
 457     }
 458
 459     msg_imprint = request->msg_imprint;
 460     md_alg = msg_imprint->hash_algo;
 461     md_alg_id = OBJ_obj2nid(md_alg->algorithm);
 462     for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
 463         const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
 464         if (md_alg_id == EVP_MD_type(current_md))
 465             md = current_md;
 466     }
 467     if (!md) {
 468         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 469                                     "Message digest algorithm is "
 470                                     "not supported.");
 471         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 472         return 0;
 473     }
 474
 475     if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
 476         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 477                                     "Superfluous message digest "
 478                                     "parameter.");
 479         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 480         return 0;
 481     }
 482     digest = msg_imprint->hashed_msg;
 483     if (digest->length != EVP_MD_size(md)) {
 484         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 485                                     "Bad message digest.");
 486         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 487         return 0;
 488     }
 489
 490     return 1;
 491 }
 492
 493 /* Returns the TSA policy based on the requested and acceptable policies. */
 494 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
 495 {
 496     ASN1_OBJECT *requested = ctx->request->policy_id;
 497     ASN1_OBJECT *policy = NULL;
 498     int i;
 499
 500     if (ctx->default_policy == NULL) {
 501         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
 502         return NULL;
 503     }
 504     if (!requested || !OBJ_cmp(requested, ctx->default_policy))
 505         policy = ctx->default_policy;
 506
 507     /* Check if the policy is acceptable. */
 508     for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
 509         ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
 510         if (!OBJ_cmp(requested, current))
 511             policy = current;
 512     }
 513     if (policy == NULL) {
 514         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
 515         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 516                                     "Requested policy is not " "supported.");
 517         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
 518     }
 519     return policy;
 520 }
 521
 522 /* Creates the TS_TST_INFO object based on the settings of the context. */
 523 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
 524                                             ASN1_OBJECT *policy)
 525 {
 526     int result = 0;
 527     TS_TST_INFO *tst_info = NULL;
 528     ASN1_INTEGER *serial = NULL;
 529     ASN1_GENERALIZEDTIME *asn1_time = NULL;
 530     long sec, usec;
 531     TS_ACCURACY *accuracy = NULL;
 532     const ASN1_INTEGER *nonce;
 533     GENERAL_NAME *tsa_name = NULL;
 534
 535     if ((tst_info = TS_TST_INFO_new()) == NULL)
 536         goto end;
 537     if (!TS_TST_INFO_set_version(tst_info, 1))
 538         goto end;
 539     if (!TS_TST_INFO_set_policy_id(tst_info, policy))
 540         goto end;
 541     if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
 542         goto end;
 543     if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
 544         || !TS_TST_INFO_set_serial(tst_info, serial))
 545         goto end;
 546     if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
 547         || (asn1_time =
 548             TS_RESP_set_genTime_with_precision(NULL, sec, usec,
 549                                         ctx->clock_precision_digits)) == NULL
 550         || !TS_TST_INFO_set_time(tst_info, asn1_time))
 551         goto end;
 552
 553     if ((ctx->seconds || ctx->millis || ctx->micros)
 554         && (accuracy = TS_ACCURACY_new()) == NULL)
 555         goto end;
 556     if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
 557         goto end;
 558     if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
 559         goto end;
 560     if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
 561         goto end;
 562     if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
 563         goto end;
 564
 565     if ((ctx->flags & TS_ORDERING)
 566         && !TS_TST_INFO_set_ordering(tst_info, 1))
 567         goto end;
 568
 569     if ((nonce = ctx->request->nonce) != NULL
 570         && !TS_TST_INFO_set_nonce(tst_info, nonce))
 571         goto end;
 572
 573     if (ctx->flags & TS_TSA_NAME) {
 574         if ((tsa_name = GENERAL_NAME_new()) == NULL)
 575             goto end;
 576         tsa_name->type = GEN_DIRNAME;
 577         tsa_name->d.dirn =
 578             X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
 579         if (!tsa_name->d.dirn)
 580             goto end;
 581         if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
 582             goto end;
 583     }
 584
 585     result = 1;
 586  end:
 587     if (!result) {
 588         TS_TST_INFO_free(tst_info);
 589         tst_info = NULL;
 590         TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
 591         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 592                                          "Error during TSTInfo "
 593                                          "generation.");
 594     }
 595     GENERAL_NAME_free(tsa_name);
 596     TS_ACCURACY_free(accuracy);
 597     ASN1_GENERALIZEDTIME_free(asn1_time);
 598     ASN1_INTEGER_free(serial);
 599
 600     return tst_info;
 601 }
 602
 603 /* Processing the extensions of the request. */
 604 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
 605 {
 606     STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
 607     int i;
 608     int ok = 1;
 609
 610     for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
 611         X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
 612         /*
 613          * The last argument was previously (void *)ctx->extension_cb,
 614          * but ISO C doesn't permit converting a function pointer to void *.
 615          * For lack of better information, I'm placing a NULL there instead.
 616          * The callback can pick its own address out from the ctx anyway...
 617          */
 618         ok = (*ctx->extension_cb) (ctx, ext, NULL);
 619     }
 620
 621     return ok;
 622 }
 623
 624 /* Functions for signing the TS_TST_INFO structure of the context. */
 625 static int ts_RESP_sign(TS_RESP_CTX *ctx)
 626 {
 627     int ret = 0;
 628     PKCS7 *p7 = NULL;
 629     PKCS7_SIGNER_INFO *si;
 630     STACK_OF(X509) *certs;      /* Certificates to include in sc. */
 631     ESS_SIGNING_CERT_V2 *sc2 = NULL;
 632     ESS_SIGNING_CERT *sc = NULL;
 633     ASN1_OBJECT *oid;
 634     BIO *p7bio = NULL;
 635     int i;
 636
 637     if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
 638         TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 639         goto err;
 640     }
 641
 642     if ((p7 = PKCS7_new()) == NULL) {
 643         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 644         goto err;
 645     }
 646     if (!PKCS7_set_type(p7, NID_pkcs7_signed))
 647         goto err;
 648     if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
 649         goto err;
 650
 651     if (ctx->request->cert_req) {
 652         PKCS7_add_certificate(p7, ctx->signer_cert);
 653         if (ctx->certs) {
 654             for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
 655                 X509 *cert = sk_X509_value(ctx->certs, i);
 656                 PKCS7_add_certificate(p7, cert);
 657             }
 658         }
 659     }
 660
 661     if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
 662                                   ctx->signer_key, ctx->signer_md)) == NULL) {
 663         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
 664         goto err;
 665     }
 666
 667     oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 668     if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 669                                     V_ASN1_OBJECT, oid)) {
 670         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
 671         goto err;
 672     }
 673
 674     certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
 675     if (ctx->ess_cert_id_digest == NULL
 676         || ctx->ess_cert_id_digest == EVP_sha1()) {
 677         if ((sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs, 0)) == NULL)
 678             goto err;
 679
 680         if (!ESS_SIGNING_CERT_add(si, sc)) {
 681             TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
 682             goto err;
 683         }
 684     } else {
 685         sc2 = ESS_SIGNING_CERT_V2_new_init(ctx->ess_cert_id_digest,
 686                                            ctx->signer_cert, certs, 0);
 687         if (sc2 == NULL)
 688             goto err;
 689
 690         if (!ESS_SIGNING_CERT_V2_add(si, sc2)) {
 691             TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
 692             goto err;
 693         }
 694     }
 695
 696     if (!ts_TST_INFO_content_new(p7))
 697         goto err;
 698     if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
 699         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 700         goto err;
 701     }
 702     if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
 703         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 704         goto err;
 705     }
 706     if (!PKCS7_dataFinal(p7, p7bio)) {
 707         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 708         goto err;
 709     }
 710     TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
 711     p7 = NULL;                  /* Ownership is lost. */
 712     ctx->tst_info = NULL;       /* Ownership is lost. */
 713
 714     ret = 1;
 715  err:
 716     if (!ret)
 717         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 718                                          "Error during signature "
 719                                          "generation.");
 720     BIO_free_all(p7bio);
 721     ESS_SIGNING_CERT_V2_free(sc2);
 722     ESS_SIGNING_CERT_free(sc);
 723     PKCS7_free(p7);
 724     return ret;
 725 }
 726
 727 static int ts_TST_INFO_content_new(PKCS7 *p7)
 728 {
 729     PKCS7 *ret = NULL;
 730     ASN1_OCTET_STRING *octet_string = NULL;
 731
 732     /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
 733     if ((ret = PKCS7_new()) == NULL)
 734         goto err;
 735     if ((ret->d.other = ASN1_TYPE_new()) == NULL)
 736         goto err;
 737     ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 738     if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
 739         goto err;
 740     ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
 741     octet_string = NULL;
 742
 743     /* Add encapsulated content to signed PKCS7 structure. */
 744     if (!PKCS7_set_content(p7, ret))
 745         goto err;
 746
 747     return 1;
 748  err:
 749     ASN1_OCTET_STRING_free(octet_string);
 750     PKCS7_free(ret);
 751     return 0;
 752 }
 753
 754 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
 755         ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
 756         unsigned precision)
 757 {
 758     time_t time_sec = (time_t)sec;
 759     struct tm *tm = NULL, tm_result;
 760     char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
 761     char *p = genTime_str;
 762     char *p_end = genTime_str + sizeof(genTime_str);
 763
 764     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 765         goto err;
 766
 767     if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
 768         goto err;
 769
 770     /*
 771      * Put "genTime_str" in GeneralizedTime format.  We work around the
 772      * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
 773      * NOT include fractional seconds") and OpenSSL related functions to
 774      * meet the rfc3161 requirement: "GeneralizedTime syntax can include
 775      * fraction-of-second details".
 776      */
 777     p += BIO_snprintf(p, p_end - p,
 778                       "%04d%02d%02d%02d%02d%02d",
 779                       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 780                       tm->tm_hour, tm->tm_min, tm->tm_sec);
 781     if (precision > 0) {
 782         BIO_snprintf(p, 2 + precision, ".%06ld", usec);
 783         p += strlen(p);
 784
 785         /*
 786          * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
 787          * following restrictions for a DER-encoding, which OpenSSL
 788          * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
 789          * support: "The encoding MUST terminate with a "Z" (which means
 790          * "Zulu" time). The decimal point element, if present, MUST be the
 791          * point option ".". The fractional-seconds elements, if present,
 792          * MUST omit all trailing 0's; if the elements correspond to 0, they
 793          * MUST be wholly omitted, and the decimal point element also MUST be
 794          * omitted."
 795          */
 796         /*
 797          * Remove trailing zeros. The dot guarantees the exit condition of
 798          * this loop even if all the digits are zero.
 799          */
 800         while (*--p == '0')
 801              continue;
 802         if (*p != '.')
 803             ++p;
 804     }
 805     *p++ = 'Z';
 806     *p++ = '\0';
 807
 808     if (asn1_time == NULL
 809         && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
 810         goto err;
 811     if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
 812         ASN1_GENERALIZEDTIME_free(asn1_time);
 813         goto err;
 814     }
 815     return asn1_time;
 816
 817  err:
 818     TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
 819     return NULL;
 820 }
 821
 822 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 823 {
 824     ctx->ess_cert_id_digest = md;
 825     return 1;
 826 }