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