crypto/ts/ts_rsp_sign.c

   1 /*
   2  * Copyright 2006-2019 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_lcl.h"
  18 #include "internal/ess_int.h"
  19
  20 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
  21 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
  22 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  23
  24 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
  25 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
  26 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
  27 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
  28 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
  29                                             ASN1_OBJECT *policy);
  30 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
  31 static int ts_RESP_sign(TS_RESP_CTX *ctx);
  32
  33 static int ts_TST_INFO_content_new(PKCS7 *p7);
  34
  35 static ASN1_GENERALIZEDTIME
  36 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
  37                                     unsigned);
  38
  39 /* Default callback for response generation. */
  40 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
  41 {
  42     ASN1_INTEGER *serial = ASN1_INTEGER_new();
  43
  44     if (serial == NULL)
  45         goto err;
  46     if (!ASN1_INTEGER_set(serial, 1))
  47         goto err;
  48     return serial;
  49
  50  err:
  51     TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
  52     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  53                                 "Error during serial number generation.");
  54     return NULL;
  55 }
  56
  57 #if defined(OPENSSL_SYS_UNIX)
  58
  59 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  60                        long *sec, long *usec)
  61 {
  62     struct timeval tv;
  63     if (gettimeofday(&tv, NULL) != 0) {
  64         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
  65         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  66                                     "Time is not available.");
  67         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  68         return 0;
  69     }
  70     *sec = tv.tv_sec;
  71     *usec = tv.tv_usec;
  72
  73     return 1;
  74 }
  75
  76 #else
  77
  78 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  79                        long *sec, long *usec)
  80 {
  81     time_t t;
  82     if (time(&t) == (time_t)-1) {
  83         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
  84         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  85                                     "Time is not available.");
  86         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  87         return 0;
  88     }
  89     *sec = (long)t;
  90     *usec = 0;
  91
  92     return 1;
  93 }
  94
  95 #endif
  96
  97 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
  98                             void *data)
  99 {
 100     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 101                                 "Unsupported extension.");
 102     TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
 103     return 0;
 104 }
 105
 106 /* TS_RESP_CTX management functions. */
 107
 108 TS_RESP_CTX *TS_RESP_CTX_new(void)
 109 {
 110     TS_RESP_CTX *ctx;
 111
 112     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
 113         TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
 114         return NULL;
 115     }
 116
 117     ctx->signer_md = EVP_sha256();
 118
 119     ctx->serial_cb = def_serial_cb;
 120     ctx->time_cb = def_time_cb;
 121     ctx->extension_cb = def_extension_cb;
 122
 123     return ctx;
 124 }
 125
 126 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
 127 {
 128     if (!ctx)
 129         return;
 130
 131     X509_free(ctx->signer_cert);
 132     EVP_PKEY_free(ctx->signer_key);
 133     sk_X509_pop_free(ctx->certs, X509_free);
 134     sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
 135     ASN1_OBJECT_free(ctx->default_policy);
 136     sk_EVP_MD_free(ctx->mds);   /* No EVP_MD_free method exists. */
 137     ASN1_INTEGER_free(ctx->seconds);
 138     ASN1_INTEGER_free(ctx->millis);
 139     ASN1_INTEGER_free(ctx->micros);
 140     OPENSSL_free(ctx);
 141 }
 142
 143 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
 144 {
 145     if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
 146         TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
 147               TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
 148         return 0;
 149     }
 150     X509_free(ctx->signer_cert);
 151     ctx->signer_cert = signer;
 152     X509_up_ref(ctx->signer_cert);
 153     return 1;
 154 }
 155
 156 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
 157 {
 158     EVP_PKEY_free(ctx->signer_key);
 159     ctx->signer_key = key;
 160     EVP_PKEY_up_ref(ctx->signer_key);
 161
 162     return 1;
 163 }
 164
 165 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 166 {
 167     ctx->signer_md = md;
 168     return 1;
 169 }
 170
 171 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
 172 {
 173     ASN1_OBJECT_free(ctx->default_policy);
 174     if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
 175         goto err;
 176     return 1;
 177  err:
 178     TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
 179     return 0;
 180 }
 181
 182 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
 183 {
 184
 185     sk_X509_pop_free(ctx->certs, X509_free);
 186     ctx->certs = NULL;
 187     if (!certs)
 188         return 1;
 189     if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) {
 190         TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
 191         return 0;
 192     }
 193
 194     return 1;
 195 }
 196
 197 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
 198 {
 199     ASN1_OBJECT *copy = NULL;
 200
 201     if (ctx->policies == NULL
 202         && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
 203         goto err;
 204     if ((copy = OBJ_dup(policy)) == NULL)
 205         goto err;
 206     if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
 207         goto err;
 208
 209     return 1;
 210  err:
 211     TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
 212     ASN1_OBJECT_free(copy);
 213     return 0;
 214 }
 215
 216 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
 217 {
 218     if (ctx->mds == NULL
 219         && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
 220         goto err;
 221     if (!sk_EVP_MD_push(ctx->mds, md))
 222         goto err;
 223
 224     return 1;
 225  err:
 226     TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
 227     return 0;
 228 }
 229
 230 #define TS_RESP_CTX_accuracy_free(ctx)          \
 231         ASN1_INTEGER_free(ctx->seconds);        \
 232         ctx->seconds = NULL;                    \
 233         ASN1_INTEGER_free(ctx->millis);         \
 234         ctx->millis = NULL;                     \
 235         ASN1_INTEGER_free(ctx->micros);         \
 236         ctx->micros = NULL;
 237
 238 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
 239                              int secs, int millis, int micros)
 240 {
 241
 242     TS_RESP_CTX_accuracy_free(ctx);
 243     if (secs
 244         && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
 245             || !ASN1_INTEGER_set(ctx->seconds, secs)))
 246         goto err;
 247     if (millis
 248         && ((ctx->millis = ASN1_INTEGER_new()) == NULL
 249             || !ASN1_INTEGER_set(ctx->millis, millis)))
 250         goto err;
 251     if (micros
 252         && ((ctx->micros = ASN1_INTEGER_new()) == NULL
 253             || !ASN1_INTEGER_set(ctx->micros, micros)))
 254         goto err;
 255
 256     return 1;
 257  err:
 258     TS_RESP_CTX_accuracy_free(ctx);
 259     TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
 260     return 0;
 261 }
 262
 263 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
 264 {
 265     ctx->flags |= flags;
 266 }
 267
 268 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
 269 {
 270     ctx->serial_cb = cb;
 271     ctx->serial_cb_data = data;
 272 }
 273
 274 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
 275 {
 276     ctx->time_cb = cb;
 277     ctx->time_cb_data = data;
 278 }
 279
 280 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
 281                                   TS_extension_cb cb, void *data)
 282 {
 283     ctx->extension_cb = cb;
 284     ctx->extension_cb_data = data;
 285 }
 286
 287 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
 288                                 int status, const char *text)
 289 {
 290     TS_STATUS_INFO *si = NULL;
 291     ASN1_UTF8STRING *utf8_text = NULL;
 292     int ret = 0;
 293
 294     if ((si = TS_STATUS_INFO_new()) == NULL)
 295         goto err;
 296     if (!ASN1_INTEGER_set(si->status, status))
 297         goto err;
 298     if (text) {
 299         if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
 300             || !ASN1_STRING_set(utf8_text, text, strlen(text)))
 301             goto err;
 302         if (si->text == NULL
 303             && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
 304             goto err;
 305         if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
 306             goto err;
 307         utf8_text = NULL;       /* Ownership is lost. */
 308     }
 309     if (!TS_RESP_set_status_info(ctx->response, si))
 310         goto err;
 311     ret = 1;
 312  err:
 313     if (!ret)
 314         TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
 315     TS_STATUS_INFO_free(si);
 316     ASN1_UTF8STRING_free(utf8_text);
 317     return ret;
 318 }
 319
 320 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
 321                                      int status, const char *text)
 322 {
 323     int ret = 1;
 324     TS_STATUS_INFO *si = ctx->response->status_info;
 325
 326     if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
 327         ret = TS_RESP_CTX_set_status_info(ctx, status, text);
 328     }
 329     return ret;
 330 }
 331
 332 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
 333 {
 334     TS_STATUS_INFO *si = ctx->response->status_info;
 335     if (si->failure_info == NULL
 336         && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
 337         goto err;
 338     if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
 339         goto err;
 340     return 1;
 341  err:
 342     TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
 343     return 0;
 344 }
 345
 346 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
 347 {
 348     return ctx->request;
 349 }
 350
 351 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
 352 {
 353     return ctx->tst_info;
 354 }
 355
 356 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
 357                                            unsigned precision)
 358 {
 359     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 360         return 0;
 361     ctx->clock_precision_digits = precision;
 362     return 1;
 363 }
 364
 365 /* Main entry method of the response generation. */
 366 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
 367 {
 368     ASN1_OBJECT *policy;
 369     TS_RESP *response;
 370     int result = 0;
 371
 372     ts_RESP_CTX_init(ctx);
 373
 374     if ((ctx->response = TS_RESP_new()) == NULL) {
 375         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
 376         goto end;
 377     }
 378     if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
 379         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 380                                     "Bad request format or system error.");
 381         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 382         goto end;
 383     }
 384     if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
 385         goto end;
 386     if (!ts_RESP_check_request(ctx))
 387         goto end;
 388     if ((policy = ts_RESP_get_policy(ctx)) == NULL)
 389         goto end;
 390     if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
 391         goto end;
 392     if (!ts_RESP_process_extensions(ctx))
 393         goto end;
 394     if (!ts_RESP_sign(ctx))
 395         goto end;
 396     result = 1;
 397
 398  end:
 399     if (!result) {
 400         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
 401         if (ctx->response != NULL) {
 402             if (TS_RESP_CTX_set_status_info_cond(ctx,
 403                                                  TS_STATUS_REJECTION,
 404                                                  "Error during response "
 405                                                  "generation.") == 0) {
 406                 TS_RESP_free(ctx->response);
 407                 ctx->response = NULL;
 408             }
 409         }
 410     }
 411     response = ctx->response;
 412     ctx->response = NULL;       /* Ownership will be returned to caller. */
 413     ts_RESP_CTX_cleanup(ctx);
 414     return response;
 415 }
 416
 417 /* Initializes the variable part of the context. */
 418 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
 419 {
 420     ctx->request = NULL;
 421     ctx->response = NULL;
 422     ctx->tst_info = NULL;
 423 }
 424
 425 /* Cleans up the variable part of the context. */
 426 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
 427 {
 428     TS_REQ_free(ctx->request);
 429     ctx->request = NULL;
 430     TS_RESP_free(ctx->response);
 431     ctx->response = NULL;
 432     TS_TST_INFO_free(ctx->tst_info);
 433     ctx->tst_info = NULL;
 434 }
 435
 436 /* Checks the format and content of the request. */
 437 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
 438 {
 439     TS_REQ *request = ctx->request;
 440     TS_MSG_IMPRINT *msg_imprint;
 441     X509_ALGOR *md_alg;
 442     int md_alg_id;
 443     const ASN1_OCTET_STRING *digest;
 444     const EVP_MD *md = NULL;
 445     int i;
 446
 447     if (TS_REQ_get_version(request) != 1) {
 448         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 449                                     "Bad request version.");
 450         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
 451         return 0;
 452     }
 453
 454     msg_imprint = request->msg_imprint;
 455     md_alg = msg_imprint->hash_algo;
 456     md_alg_id = OBJ_obj2nid(md_alg->algorithm);
 457     for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
 458         const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
 459         if (md_alg_id == EVP_MD_type(current_md))
 460             md = current_md;
 461     }
 462     if (!md) {
 463         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 464                                     "Message digest algorithm is "
 465                                     "not supported.");
 466         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 467         return 0;
 468     }
 469
 470     if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
 471         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 472                                     "Superfluous message digest "
 473                                     "parameter.");
 474         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 475         return 0;
 476     }
 477     digest = msg_imprint->hashed_msg;
 478     if (digest->length != EVP_MD_size(md)) {
 479         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 480                                     "Bad message digest.");
 481         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 482         return 0;
 483     }
 484
 485     return 1;
 486 }
 487
 488 /* Returns the TSA policy based on the requested and acceptable policies. */
 489 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
 490 {
 491     ASN1_OBJECT *requested = ctx->request->policy_id;
 492     ASN1_OBJECT *policy = NULL;
 493     int i;
 494
 495     if (ctx->default_policy == NULL) {
 496         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
 497         return NULL;
 498     }
 499     if (!requested || !OBJ_cmp(requested, ctx->default_policy))
 500         policy = ctx->default_policy;
 501
 502     /* Check if the policy is acceptable. */
 503     for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
 504         ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
 505         if (!OBJ_cmp(requested, current))
 506             policy = current;
 507     }
 508     if (!policy) {
 509         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
 510         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 511                                     "Requested policy is not " "supported.");
 512         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
 513     }
 514     return policy;
 515 }
 516
 517 /* Creates the TS_TST_INFO object based on the settings of the context. */
 518 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
 519                                             ASN1_OBJECT *policy)
 520 {
 521     int result = 0;
 522     TS_TST_INFO *tst_info = NULL;
 523     ASN1_INTEGER *serial = NULL;
 524     ASN1_GENERALIZEDTIME *asn1_time = NULL;
 525     long sec, usec;
 526     TS_ACCURACY *accuracy = NULL;
 527     const ASN1_INTEGER *nonce;
 528     GENERAL_NAME *tsa_name = NULL;
 529
 530     if ((tst_info = TS_TST_INFO_new()) == NULL)
 531         goto end;
 532     if (!TS_TST_INFO_set_version(tst_info, 1))
 533         goto end;
 534     if (!TS_TST_INFO_set_policy_id(tst_info, policy))
 535         goto end;
 536     if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
 537         goto end;
 538     if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
 539         || !TS_TST_INFO_set_serial(tst_info, serial))
 540         goto end;
 541     if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
 542         || (asn1_time =
 543             TS_RESP_set_genTime_with_precision(NULL, sec, usec,
 544                                         ctx->clock_precision_digits)) == NULL
 545         || !TS_TST_INFO_set_time(tst_info, asn1_time))
 546         goto end;
 547
 548     if ((ctx->seconds || ctx->millis || ctx->micros)
 549         && (accuracy = TS_ACCURACY_new()) == NULL)
 550         goto end;
 551     if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
 552         goto end;
 553     if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
 554         goto end;
 555     if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
 556         goto end;
 557     if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
 558         goto end;
 559
 560     if ((ctx->flags & TS_ORDERING)
 561         && !TS_TST_INFO_set_ordering(tst_info, 1))
 562         goto end;
 563
 564     if ((nonce = ctx->request->nonce) != NULL
 565         && !TS_TST_INFO_set_nonce(tst_info, nonce))
 566         goto end;
 567
 568     if (ctx->flags & TS_TSA_NAME) {
 569         if ((tsa_name = GENERAL_NAME_new()) == NULL)
 570             goto end;
 571         tsa_name->type = GEN_DIRNAME;
 572         tsa_name->d.dirn =
 573             X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
 574         if (!tsa_name->d.dirn)
 575             goto end;
 576         if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
 577             goto end;
 578     }
 579
 580     result = 1;
 581  end:
 582     if (!result) {
 583         TS_TST_INFO_free(tst_info);
 584         tst_info = NULL;
 585         TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
 586         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 587                                          "Error during TSTInfo "
 588                                          "generation.");
 589     }
 590     GENERAL_NAME_free(tsa_name);
 591     TS_ACCURACY_free(accuracy);
 592     ASN1_GENERALIZEDTIME_free(asn1_time);
 593     ASN1_INTEGER_free(serial);
 594
 595     return tst_info;
 596 }
 597
 598 /* Processing the extensions of the request. */
 599 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
 600 {
 601     STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
 602     int i;
 603     int ok = 1;
 604
 605     for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
 606         X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
 607         /*
 608          * The last argument was previously (void *)ctx->extension_cb,
 609          * but ISO C doesn't permit converting a function pointer to void *.
 610          * For lack of better information, I'm placing a NULL there instead.
 611          * The callback can pick its own address out from the ctx anyway...
 612          */
 613         ok = (*ctx->extension_cb) (ctx, ext, NULL);
 614     }
 615
 616     return ok;
 617 }
 618
 619 /* Functions for signing the TS_TST_INFO structure of the context. */
 620 static int ts_RESP_sign(TS_RESP_CTX *ctx)
 621 {
 622     int ret = 0;
 623     PKCS7 *p7 = NULL;
 624     PKCS7_SIGNER_INFO *si;
 625     STACK_OF(X509) *certs;      /* Certificates to include in sc. */
 626     ESS_SIGNING_CERT_V2 *sc2 = NULL;
 627     ESS_SIGNING_CERT *sc = NULL;
 628     ASN1_OBJECT *oid;
 629     BIO *p7bio = NULL;
 630     int i;
 631
 632     if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
 633         TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 634         goto err;
 635     }
 636
 637     if ((p7 = PKCS7_new()) == NULL) {
 638         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 639         goto err;
 640     }
 641     if (!PKCS7_set_type(p7, NID_pkcs7_signed))
 642         goto err;
 643     if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
 644         goto err;
 645
 646     if (ctx->request->cert_req) {
 647         PKCS7_add_certificate(p7, ctx->signer_cert);
 648         if (ctx->certs) {
 649             for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
 650                 X509 *cert = sk_X509_value(ctx->certs, i);
 651                 PKCS7_add_certificate(p7, cert);
 652             }
 653         }
 654     }
 655
 656     if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
 657                                   ctx->signer_key, ctx->signer_md)) == NULL) {
 658         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
 659         goto err;
 660     }
 661
 662     oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 663     if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 664                                     V_ASN1_OBJECT, oid)) {
 665         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
 666         goto err;
 667     }
 668
 669     certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
 670     if (ctx->ess_cert_id_digest == NULL
 671         || ctx->ess_cert_id_digest == EVP_sha1()) {
 672         if ((sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs, 0)) == NULL)
 673             goto err;
 674
 675         if (!ESS_SIGNING_CERT_add(si, sc)) {
 676             TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
 677             goto err;
 678         }
 679     } else {
 680         sc2 = ESS_SIGNING_CERT_V2_new_init(ctx->ess_cert_id_digest,
 681                                            ctx->signer_cert, certs, 0);
 682         if (sc2 == NULL)
 683             goto err;
 684
 685         if (!ESS_SIGNING_CERT_V2_add(si, sc2)) {
 686             TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
 687             goto err;
 688         }
 689     }
 690
 691     if (!ts_TST_INFO_content_new(p7))
 692         goto err;
 693     if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
 694         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 695         goto err;
 696     }
 697     if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
 698         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 699         goto err;
 700     }
 701     if (!PKCS7_dataFinal(p7, p7bio)) {
 702         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 703         goto err;
 704     }
 705     TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
 706     p7 = NULL;                  /* Ownership is lost. */
 707     ctx->tst_info = NULL;       /* Ownership is lost. */
 708
 709     ret = 1;
 710  err:
 711     if (!ret)
 712         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 713                                          "Error during signature "
 714                                          "generation.");
 715     BIO_free_all(p7bio);
 716     ESS_SIGNING_CERT_V2_free(sc2);
 717     ESS_SIGNING_CERT_free(sc);
 718     PKCS7_free(p7);
 719     return ret;
 720 }
 721
 722 static int ts_TST_INFO_content_new(PKCS7 *p7)
 723 {
 724     PKCS7 *ret = NULL;
 725     ASN1_OCTET_STRING *octet_string = NULL;
 726
 727     /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
 728     if ((ret = PKCS7_new()) == NULL)
 729         goto err;
 730     if ((ret->d.other = ASN1_TYPE_new()) == NULL)
 731         goto err;
 732     ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 733     if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
 734         goto err;
 735     ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
 736     octet_string = NULL;
 737
 738     /* Add encapsulated content to signed PKCS7 structure. */
 739     if (!PKCS7_set_content(p7, ret))
 740         goto err;
 741
 742     return 1;
 743  err:
 744     ASN1_OCTET_STRING_free(octet_string);
 745     PKCS7_free(ret);
 746     return 0;
 747 }
 748
 749 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
 750         ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
 751         unsigned precision)
 752 {
 753     time_t time_sec = (time_t)sec;
 754     struct tm *tm = NULL, tm_result;
 755     char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
 756     char *p = genTime_str;
 757     char *p_end = genTime_str + sizeof(genTime_str);
 758
 759     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 760         goto err;
 761
 762     if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
 763         goto err;
 764
 765     /*
 766      * Put "genTime_str" in GeneralizedTime format.  We work around the
 767      * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
 768      * NOT include fractional seconds") and OpenSSL related functions to
 769      * meet the rfc3161 requirement: "GeneralizedTime syntax can include
 770      * fraction-of-second details".
 771      */
 772     p += BIO_snprintf(p, p_end - p,
 773                       "%04d%02d%02d%02d%02d%02d",
 774                       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 775                       tm->tm_hour, tm->tm_min, tm->tm_sec);
 776     if (precision > 0) {
 777         BIO_snprintf(p, 2 + precision, ".%06ld", usec);
 778         p += strlen(p);
 779
 780         /*
 781          * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
 782          * following restrictions for a DER-encoding, which OpenSSL
 783          * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
 784          * support: "The encoding MUST terminate with a "Z" (which means
 785          * "Zulu" time). The decimal point element, if present, MUST be the
 786          * point option ".". The fractional-seconds elements, if present,
 787          * MUST omit all trailing 0's; if the elements correspond to 0, they
 788          * MUST be wholly omitted, and the decimal point element also MUST be
 789          * omitted."
 790          */
 791         /*
 792          * Remove trailing zeros. The dot guarantees the exit condition of
 793          * this loop even if all the digits are zero.
 794          */
 795         while (*--p == '0')
 796              continue;
 797         if (*p != '.')
 798             ++p;
 799     }
 800     *p++ = 'Z';
 801     *p++ = '\0';
 802
 803     if (asn1_time == NULL
 804         && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
 805         goto err;
 806     if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
 807         ASN1_GENERALIZEDTIME_free(asn1_time);
 808         goto err;
 809     }
 810     return asn1_time;
 811
 812  err:
 813     TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
 814     return NULL;
 815 }
 816
 817 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 818 {
 819     ctx->ess_cert_id_digest = md;
 820     return 1;
 821 }