crypto/ts/ts_rsp_sign.c

   1 /*
   2  * Copyright 2006-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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
  19 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
  20 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
  21 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  22
  23 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
  24 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
  25 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
  26 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
  27 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
  28                                             ASN1_OBJECT *policy);
  29 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
  30 static int ts_RESP_sign(TS_RESP_CTX *ctx);
  31
  32 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert,
  33                                                    STACK_OF(X509) *certs);
  34 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed);
  35 static int ts_TST_INFO_content_new(PKCS7 *p7);
  36 static int ess_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
  37
  38 static ESS_SIGNING_CERT_V2 *ess_signing_cert_v2_new_init(const EVP_MD *hash_alg,
  39                                                          X509 *signcert,
  40                                                          STACK_OF(X509)
  41                                                          *certs);
  42 static ESS_CERT_ID_V2 *ess_cert_id_v2_new_init(const EVP_MD *hash_alg,
  43                                                X509 *cert, int issuer_needed);
  44 static int ess_add_signing_cert_v2(PKCS7_SIGNER_INFO *si,
  45                                    ESS_SIGNING_CERT_V2 *sc);
  46
  47 static ASN1_GENERALIZEDTIME
  48 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
  49                                     unsigned);
  50
  51 /* Default callback for response generation. */
  52 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
  53 {
  54     ASN1_INTEGER *serial = ASN1_INTEGER_new();
  55
  56     if (serial == NULL)
  57         goto err;
  58     if (!ASN1_INTEGER_set(serial, 1))
  59         goto err;
  60     return serial;
  61
  62  err:
  63     TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
  64     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  65                                 "Error during serial number generation.");
  66     return NULL;
  67 }
  68
  69 #if defined(OPENSSL_SYS_UNIX)
  70
  71 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  72                        long *sec, long *usec)
  73 {
  74     struct timeval tv;
  75     if (gettimeofday(&tv, NULL) != 0) {
  76         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
  77         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  78                                     "Time is not available.");
  79         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  80         return 0;
  81     }
  82     *sec = tv.tv_sec;
  83     *usec = tv.tv_usec;
  84
  85     return 1;
  86 }
  87
  88 #else
  89
  90 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  91                        long *sec, long *usec)
  92 {
  93     time_t t;
  94     if (time(&t) == (time_t)-1) {
  95         TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
  96         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  97                                     "Time is not available.");
  98         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  99         return 0;
 100     }
 101     *sec = (long)t;
 102     *usec = 0;
 103
 104     return 1;
 105 }
 106
 107 #endif
 108
 109 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
 110                             void *data)
 111 {
 112     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 113                                 "Unsupported extension.");
 114     TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
 115     return 0;
 116 }
 117
 118 /* TS_RESP_CTX management functions. */
 119
 120 TS_RESP_CTX *TS_RESP_CTX_new(void)
 121 {
 122     TS_RESP_CTX *ctx;
 123
 124     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
 125         TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
 126         return NULL;
 127     }
 128
 129     ctx->signer_md = EVP_sha256();
 130
 131     ctx->serial_cb = def_serial_cb;
 132     ctx->time_cb = def_time_cb;
 133     ctx->extension_cb = def_extension_cb;
 134
 135     return ctx;
 136 }
 137
 138 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
 139 {
 140     if (!ctx)
 141         return;
 142
 143     X509_free(ctx->signer_cert);
 144     EVP_PKEY_free(ctx->signer_key);
 145     sk_X509_pop_free(ctx->certs, X509_free);
 146     sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
 147     ASN1_OBJECT_free(ctx->default_policy);
 148     sk_EVP_MD_free(ctx->mds);   /* No EVP_MD_free method exists. */
 149     ASN1_INTEGER_free(ctx->seconds);
 150     ASN1_INTEGER_free(ctx->millis);
 151     ASN1_INTEGER_free(ctx->micros);
 152     OPENSSL_free(ctx);
 153 }
 154
 155 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
 156 {
 157     if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
 158         TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
 159               TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
 160         return 0;
 161     }
 162     X509_free(ctx->signer_cert);
 163     ctx->signer_cert = signer;
 164     X509_up_ref(ctx->signer_cert);
 165     return 1;
 166 }
 167
 168 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
 169 {
 170     EVP_PKEY_free(ctx->signer_key);
 171     ctx->signer_key = key;
 172     EVP_PKEY_up_ref(ctx->signer_key);
 173
 174     return 1;
 175 }
 176
 177 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 178 {
 179     ctx->signer_md = md;
 180     return 1;
 181 }
 182
 183 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
 184 {
 185     ASN1_OBJECT_free(ctx->default_policy);
 186     if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
 187         goto err;
 188     return 1;
 189  err:
 190     TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
 191     return 0;
 192 }
 193
 194 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
 195 {
 196
 197     sk_X509_pop_free(ctx->certs, X509_free);
 198     ctx->certs = NULL;
 199     if (!certs)
 200         return 1;
 201     if ((ctx->certs = X509_chain_up_ref(certs)) == NULL) {
 202         TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
 203         return 0;
 204     }
 205
 206     return 1;
 207 }
 208
 209 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
 210 {
 211     ASN1_OBJECT *copy = NULL;
 212
 213     if (ctx->policies == NULL
 214         && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
 215         goto err;
 216     if ((copy = OBJ_dup(policy)) == NULL)
 217         goto err;
 218     if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
 219         goto err;
 220
 221     return 1;
 222  err:
 223     TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
 224     ASN1_OBJECT_free(copy);
 225     return 0;
 226 }
 227
 228 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
 229 {
 230     if (ctx->mds == NULL
 231         && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
 232         goto err;
 233     if (!sk_EVP_MD_push(ctx->mds, md))
 234         goto err;
 235
 236     return 1;
 237  err:
 238     TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
 239     return 0;
 240 }
 241
 242 #define TS_RESP_CTX_accuracy_free(ctx)          \
 243         ASN1_INTEGER_free(ctx->seconds);        \
 244         ctx->seconds = NULL;                    \
 245         ASN1_INTEGER_free(ctx->millis);         \
 246         ctx->millis = NULL;                     \
 247         ASN1_INTEGER_free(ctx->micros);         \
 248         ctx->micros = NULL;
 249
 250 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
 251                              int secs, int millis, int micros)
 252 {
 253
 254     TS_RESP_CTX_accuracy_free(ctx);
 255     if (secs
 256         && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
 257             || !ASN1_INTEGER_set(ctx->seconds, secs)))
 258         goto err;
 259     if (millis
 260         && ((ctx->millis = ASN1_INTEGER_new()) == NULL
 261             || !ASN1_INTEGER_set(ctx->millis, millis)))
 262         goto err;
 263     if (micros
 264         && ((ctx->micros = ASN1_INTEGER_new()) == NULL
 265             || !ASN1_INTEGER_set(ctx->micros, micros)))
 266         goto err;
 267
 268     return 1;
 269  err:
 270     TS_RESP_CTX_accuracy_free(ctx);
 271     TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
 272     return 0;
 273 }
 274
 275 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
 276 {
 277     ctx->flags |= flags;
 278 }
 279
 280 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
 281 {
 282     ctx->serial_cb = cb;
 283     ctx->serial_cb_data = data;
 284 }
 285
 286 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
 287 {
 288     ctx->time_cb = cb;
 289     ctx->time_cb_data = data;
 290 }
 291
 292 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
 293                                   TS_extension_cb cb, void *data)
 294 {
 295     ctx->extension_cb = cb;
 296     ctx->extension_cb_data = data;
 297 }
 298
 299 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
 300                                 int status, const char *text)
 301 {
 302     TS_STATUS_INFO *si = NULL;
 303     ASN1_UTF8STRING *utf8_text = NULL;
 304     int ret = 0;
 305
 306     if ((si = TS_STATUS_INFO_new()) == NULL)
 307         goto err;
 308     if (!ASN1_INTEGER_set(si->status, status))
 309         goto err;
 310     if (text) {
 311         if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
 312             || !ASN1_STRING_set(utf8_text, text, strlen(text)))
 313             goto err;
 314         if (si->text == NULL
 315             && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
 316             goto err;
 317         if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
 318             goto err;
 319         utf8_text = NULL;       /* Ownership is lost. */
 320     }
 321     if (!TS_RESP_set_status_info(ctx->response, si))
 322         goto err;
 323     ret = 1;
 324  err:
 325     if (!ret)
 326         TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
 327     TS_STATUS_INFO_free(si);
 328     ASN1_UTF8STRING_free(utf8_text);
 329     return ret;
 330 }
 331
 332 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
 333                                      int status, const char *text)
 334 {
 335     int ret = 1;
 336     TS_STATUS_INFO *si = ctx->response->status_info;
 337
 338     if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
 339         ret = TS_RESP_CTX_set_status_info(ctx, status, text);
 340     }
 341     return ret;
 342 }
 343
 344 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
 345 {
 346     TS_STATUS_INFO *si = ctx->response->status_info;
 347     if (si->failure_info == NULL
 348         && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
 349         goto err;
 350     if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
 351         goto err;
 352     return 1;
 353  err:
 354     TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
 355     return 0;
 356 }
 357
 358 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
 359 {
 360     return ctx->request;
 361 }
 362
 363 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
 364 {
 365     return ctx->tst_info;
 366 }
 367
 368 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
 369                                            unsigned precision)
 370 {
 371     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 372         return 0;
 373     ctx->clock_precision_digits = precision;
 374     return 1;
 375 }
 376
 377 /* Main entry method of the response generation. */
 378 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
 379 {
 380     ASN1_OBJECT *policy;
 381     TS_RESP *response;
 382     int result = 0;
 383
 384     ts_RESP_CTX_init(ctx);
 385
 386     if ((ctx->response = TS_RESP_new()) == NULL) {
 387         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
 388         goto end;
 389     }
 390     if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
 391         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 392                                     "Bad request format or system error.");
 393         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 394         goto end;
 395     }
 396     if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
 397         goto end;
 398     if (!ts_RESP_check_request(ctx))
 399         goto end;
 400     if ((policy = ts_RESP_get_policy(ctx)) == NULL)
 401         goto end;
 402     if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
 403         goto end;
 404     if (!ts_RESP_process_extensions(ctx))
 405         goto end;
 406     if (!ts_RESP_sign(ctx))
 407         goto end;
 408     result = 1;
 409
 410  end:
 411     if (!result) {
 412         TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
 413         if (ctx->response != NULL) {
 414             if (TS_RESP_CTX_set_status_info_cond(ctx,
 415                                                  TS_STATUS_REJECTION,
 416                                                  "Error during response "
 417                                                  "generation.") == 0) {
 418                 TS_RESP_free(ctx->response);
 419                 ctx->response = NULL;
 420             }
 421         }
 422     }
 423     response = ctx->response;
 424     ctx->response = NULL;       /* Ownership will be returned to caller. */
 425     ts_RESP_CTX_cleanup(ctx);
 426     return response;
 427 }
 428
 429 /* Initializes the variable part of the context. */
 430 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
 431 {
 432     ctx->request = NULL;
 433     ctx->response = NULL;
 434     ctx->tst_info = NULL;
 435 }
 436
 437 /* Cleans up the variable part of the context. */
 438 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
 439 {
 440     TS_REQ_free(ctx->request);
 441     ctx->request = NULL;
 442     TS_RESP_free(ctx->response);
 443     ctx->response = NULL;
 444     TS_TST_INFO_free(ctx->tst_info);
 445     ctx->tst_info = NULL;
 446 }
 447
 448 /* Checks the format and content of the request. */
 449 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
 450 {
 451     TS_REQ *request = ctx->request;
 452     TS_MSG_IMPRINT *msg_imprint;
 453     X509_ALGOR *md_alg;
 454     int md_alg_id;
 455     const ASN1_OCTET_STRING *digest;
 456     const EVP_MD *md = NULL;
 457     int i;
 458
 459     if (TS_REQ_get_version(request) != 1) {
 460         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 461                                     "Bad request version.");
 462         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
 463         return 0;
 464     }
 465
 466     msg_imprint = request->msg_imprint;
 467     md_alg = msg_imprint->hash_algo;
 468     md_alg_id = OBJ_obj2nid(md_alg->algorithm);
 469     for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
 470         const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
 471         if (md_alg_id == EVP_MD_type(current_md))
 472             md = current_md;
 473     }
 474     if (!md) {
 475         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 476                                     "Message digest algorithm is "
 477                                     "not supported.");
 478         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 479         return 0;
 480     }
 481
 482     if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
 483         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 484                                     "Superfluous message digest "
 485                                     "parameter.");
 486         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 487         return 0;
 488     }
 489     digest = msg_imprint->hashed_msg;
 490     if (digest->length != EVP_MD_size(md)) {
 491         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 492                                     "Bad message digest.");
 493         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 494         return 0;
 495     }
 496
 497     return 1;
 498 }
 499
 500 /* Returns the TSA policy based on the requested and acceptable policies. */
 501 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
 502 {
 503     ASN1_OBJECT *requested = ctx->request->policy_id;
 504     ASN1_OBJECT *policy = NULL;
 505     int i;
 506
 507     if (ctx->default_policy == NULL) {
 508         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
 509         return NULL;
 510     }
 511     if (!requested || !OBJ_cmp(requested, ctx->default_policy))
 512         policy = ctx->default_policy;
 513
 514     /* Check if the policy is acceptable. */
 515     for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
 516         ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
 517         if (!OBJ_cmp(requested, current))
 518             policy = current;
 519     }
 520     if (!policy) {
 521         TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
 522         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 523                                     "Requested policy is not " "supported.");
 524         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
 525     }
 526     return policy;
 527 }
 528
 529 /* Creates the TS_TST_INFO object based on the settings of the context. */
 530 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
 531                                             ASN1_OBJECT *policy)
 532 {
 533     int result = 0;
 534     TS_TST_INFO *tst_info = NULL;
 535     ASN1_INTEGER *serial = NULL;
 536     ASN1_GENERALIZEDTIME *asn1_time = NULL;
 537     long sec, usec;
 538     TS_ACCURACY *accuracy = NULL;
 539     const ASN1_INTEGER *nonce;
 540     GENERAL_NAME *tsa_name = NULL;
 541
 542     if ((tst_info = TS_TST_INFO_new()) == NULL)
 543         goto end;
 544     if (!TS_TST_INFO_set_version(tst_info, 1))
 545         goto end;
 546     if (!TS_TST_INFO_set_policy_id(tst_info, policy))
 547         goto end;
 548     if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
 549         goto end;
 550     if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
 551         || !TS_TST_INFO_set_serial(tst_info, serial))
 552         goto end;
 553     if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
 554         || (asn1_time =
 555             TS_RESP_set_genTime_with_precision(NULL, sec, usec,
 556                                         ctx->clock_precision_digits)) == NULL
 557         || !TS_TST_INFO_set_time(tst_info, asn1_time))
 558         goto end;
 559
 560     if ((ctx->seconds || ctx->millis || ctx->micros)
 561         && (accuracy = TS_ACCURACY_new()) == NULL)
 562         goto end;
 563     if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
 564         goto end;
 565     if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
 566         goto end;
 567     if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
 568         goto end;
 569     if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
 570         goto end;
 571
 572     if ((ctx->flags & TS_ORDERING)
 573         && !TS_TST_INFO_set_ordering(tst_info, 1))
 574         goto end;
 575
 576     if ((nonce = ctx->request->nonce) != NULL
 577         && !TS_TST_INFO_set_nonce(tst_info, nonce))
 578         goto end;
 579
 580     if (ctx->flags & TS_TSA_NAME) {
 581         if ((tsa_name = GENERAL_NAME_new()) == NULL)
 582             goto end;
 583         tsa_name->type = GEN_DIRNAME;
 584         tsa_name->d.dirn =
 585             X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
 586         if (!tsa_name->d.dirn)
 587             goto end;
 588         if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
 589             goto end;
 590     }
 591
 592     result = 1;
 593  end:
 594     if (!result) {
 595         TS_TST_INFO_free(tst_info);
 596         tst_info = NULL;
 597         TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
 598         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 599                                          "Error during TSTInfo "
 600                                          "generation.");
 601     }
 602     GENERAL_NAME_free(tsa_name);
 603     TS_ACCURACY_free(accuracy);
 604     ASN1_GENERALIZEDTIME_free(asn1_time);
 605     ASN1_INTEGER_free(serial);
 606
 607     return tst_info;
 608 }
 609
 610 /* Processing the extensions of the request. */
 611 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
 612 {
 613     STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
 614     int i;
 615     int ok = 1;
 616
 617     for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
 618         X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
 619         /*
 620          * The last argument was previously (void *)ctx->extension_cb,
 621          * but ISO C doesn't permit converting a function pointer to void *.
 622          * For lack of better information, I'm placing a NULL there instead.
 623          * The callback can pick its own address out from the ctx anyway...
 624          */
 625         ok = (*ctx->extension_cb) (ctx, ext, NULL);
 626     }
 627
 628     return ok;
 629 }
 630
 631 /* Functions for signing the TS_TST_INFO structure of the context. */
 632 static int ts_RESP_sign(TS_RESP_CTX *ctx)
 633 {
 634     int ret = 0;
 635     PKCS7 *p7 = NULL;
 636     PKCS7_SIGNER_INFO *si;
 637     STACK_OF(X509) *certs;      /* Certificates to include in sc. */
 638     ESS_SIGNING_CERT_V2 *sc2 = NULL;
 639     ESS_SIGNING_CERT *sc = NULL;
 640     ASN1_OBJECT *oid;
 641     BIO *p7bio = NULL;
 642     int i;
 643
 644     if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
 645         TSerr(TS_F_TS_RESP_SIGN, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 646         goto err;
 647     }
 648
 649     if ((p7 = PKCS7_new()) == NULL) {
 650         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 651         goto err;
 652     }
 653     if (!PKCS7_set_type(p7, NID_pkcs7_signed))
 654         goto err;
 655     if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
 656         goto err;
 657
 658     if (ctx->request->cert_req) {
 659         PKCS7_add_certificate(p7, ctx->signer_cert);
 660         if (ctx->certs) {
 661             for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
 662                 X509 *cert = sk_X509_value(ctx->certs, i);
 663                 PKCS7_add_certificate(p7, cert);
 664             }
 665         }
 666     }
 667
 668     if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
 669                                   ctx->signer_key, ctx->signer_md)) == NULL) {
 670         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
 671         goto err;
 672     }
 673
 674     oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 675     if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 676                                     V_ASN1_OBJECT, oid)) {
 677         TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
 678         goto err;
 679     }
 680
 681     certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
 682     if (ctx->ess_cert_id_digest == NULL
 683         || ctx->ess_cert_id_digest == EVP_sha1()) {
 684         if ((sc = ess_SIGNING_CERT_new_init(ctx->signer_cert, certs)) == NULL)
 685             goto err;
 686
 687         if (!ess_add_signing_cert(si, sc)) {
 688             TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
 689             goto err;
 690         }
 691     } else {
 692         sc2 = ess_signing_cert_v2_new_init(ctx->ess_cert_id_digest,
 693                                            ctx->signer_cert, certs);
 694         if (sc2 == NULL)
 695             goto err;
 696
 697         if (!ess_add_signing_cert_v2(si, sc2)) {
 698             TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
 699             goto err;
 700         }
 701     }
 702
 703     if (!ts_TST_INFO_content_new(p7))
 704         goto err;
 705     if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
 706         TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 707         goto err;
 708     }
 709     if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
 710         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 711         goto err;
 712     }
 713     if (!PKCS7_dataFinal(p7, p7bio)) {
 714         TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 715         goto err;
 716     }
 717     TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
 718     p7 = NULL;                  /* Ownership is lost. */
 719     ctx->tst_info = NULL;       /* Ownership is lost. */
 720
 721     ret = 1;
 722  err:
 723     if (!ret)
 724         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 725                                          "Error during signature "
 726                                          "generation.");
 727     BIO_free_all(p7bio);
 728     ESS_SIGNING_CERT_V2_free(sc2);
 729     ESS_SIGNING_CERT_free(sc);
 730     PKCS7_free(p7);
 731     return ret;
 732 }
 733
 734 static ESS_SIGNING_CERT *ess_SIGNING_CERT_new_init(X509 *signcert,
 735                                                    STACK_OF(X509) *certs)
 736 {
 737     ESS_CERT_ID *cid;
 738     ESS_SIGNING_CERT *sc = NULL;
 739     int i;
 740
 741     if ((sc = ESS_SIGNING_CERT_new()) == NULL)
 742         goto err;
 743     if (sc->cert_ids == NULL
 744         && (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL)
 745         goto err;
 746
 747     if ((cid = ess_CERT_ID_new_init(signcert, 0)) == NULL
 748         || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
 749         goto err;
 750     for (i = 0; i < sk_X509_num(certs); ++i) {
 751         X509 *cert = sk_X509_value(certs, i);
 752         if ((cid = ess_CERT_ID_new_init(cert, 1)) == NULL
 753             || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
 754             goto err;
 755     }
 756
 757     return sc;
 758  err:
 759     ESS_SIGNING_CERT_free(sc);
 760     TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
 761     return NULL;
 762 }
 763
 764 static ESS_CERT_ID *ess_CERT_ID_new_init(X509 *cert, int issuer_needed)
 765 {
 766     ESS_CERT_ID *cid = NULL;
 767     GENERAL_NAME *name = NULL;
 768     unsigned char cert_sha1[SHA_DIGEST_LENGTH];
 769
 770     /* Call for side-effect of computing hash and caching extensions */
 771     X509_check_purpose(cert, -1, 0);
 772     if ((cid = ESS_CERT_ID_new()) == NULL)
 773         goto err;
 774     X509_digest(cert, EVP_sha1(), cert_sha1, NULL);
 775     if (!ASN1_OCTET_STRING_set(cid->hash, cert_sha1, SHA_DIGEST_LENGTH))
 776         goto err;
 777
 778     /* Setting the issuer/serial if requested. */
 779     if (issuer_needed) {
 780         if (cid->issuer_serial == NULL
 781             && (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
 782             goto err;
 783         if ((name = GENERAL_NAME_new()) == NULL)
 784             goto err;
 785         name->type = GEN_DIRNAME;
 786         if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
 787             goto err;
 788         if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
 789             goto err;
 790         name = NULL;            /* Ownership is lost. */
 791         ASN1_INTEGER_free(cid->issuer_serial->serial);
 792         if (!(cid->issuer_serial->serial =
 793               ASN1_INTEGER_dup(X509_get_serialNumber(cert))))
 794             goto err;
 795     }
 796
 797     return cid;
 798  err:
 799     GENERAL_NAME_free(name);
 800     ESS_CERT_ID_free(cid);
 801     TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
 802     return NULL;
 803 }
 804
 805 static int ts_TST_INFO_content_new(PKCS7 *p7)
 806 {
 807     PKCS7 *ret = NULL;
 808     ASN1_OCTET_STRING *octet_string = NULL;
 809
 810     /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
 811     if ((ret = PKCS7_new()) == NULL)
 812         goto err;
 813     if ((ret->d.other = ASN1_TYPE_new()) == NULL)
 814         goto err;
 815     ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 816     if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
 817         goto err;
 818     ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
 819     octet_string = NULL;
 820
 821     /* Add encapsulated content to signed PKCS7 structure. */
 822     if (!PKCS7_set_content(p7, ret))
 823         goto err;
 824
 825     return 1;
 826  err:
 827     ASN1_OCTET_STRING_free(octet_string);
 828     PKCS7_free(ret);
 829     return 0;
 830 }
 831
 832 static int ess_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
 833 {
 834     ASN1_STRING *seq = NULL;
 835     unsigned char *p, *pp = NULL;
 836     int len;
 837
 838     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 839     if ((pp = OPENSSL_malloc(len)) == NULL) {
 840         TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 841         goto err;
 842     }
 843     p = pp;
 844     i2d_ESS_SIGNING_CERT(sc, &p);
 845     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 846         TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 847         goto err;
 848     }
 849     OPENSSL_free(pp);
 850     pp = NULL;
 851     return PKCS7_add_signed_attribute(si,
 852                                       NID_id_smime_aa_signingCertificate,
 853                                       V_ASN1_SEQUENCE, seq);
 854  err:
 855     ASN1_STRING_free(seq);
 856     OPENSSL_free(pp);
 857
 858     return 0;
 859 }
 860
 861 static ESS_SIGNING_CERT_V2 *ess_signing_cert_v2_new_init(const EVP_MD *hash_alg,
 862                                                          X509 *signcert,
 863                                                          STACK_OF(X509) *certs)
 864 {
 865     ESS_CERT_ID_V2 *cid = NULL;
 866     ESS_SIGNING_CERT_V2 *sc = NULL;
 867     int i;
 868
 869     if ((sc = ESS_SIGNING_CERT_V2_new()) == NULL)
 870         goto err;
 871     if ((cid = ess_cert_id_v2_new_init(hash_alg, signcert, 0)) == NULL)
 872         goto err;
 873     if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid))
 874         goto err;
 875     cid = NULL;
 876
 877     for (i = 0; i < sk_X509_num(certs); ++i) {
 878         X509 *cert = sk_X509_value(certs, i);
 879
 880         if ((cid = ess_cert_id_v2_new_init(hash_alg, cert, 1)) == NULL)
 881             goto err;
 882         if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid))
 883             goto err;
 884         cid = NULL;
 885     }
 886
 887     return sc;
 888  err:
 889     ESS_SIGNING_CERT_V2_free(sc);
 890     ESS_CERT_ID_V2_free(cid);
 891     TSerr(TS_F_ESS_SIGNING_CERT_V2_NEW_INIT, ERR_R_MALLOC_FAILURE);
 892     return NULL;
 893 }
 894
 895 static ESS_CERT_ID_V2 *ess_cert_id_v2_new_init(const EVP_MD *hash_alg,
 896                                                X509 *cert, int issuer_needed)
 897 {
 898     ESS_CERT_ID_V2 *cid = NULL;
 899     GENERAL_NAME *name = NULL;
 900     unsigned char hash[EVP_MAX_MD_SIZE];
 901     unsigned int hash_len = sizeof(hash);
 902     X509_ALGOR *alg = NULL;
 903
 904     memset(hash, 0, sizeof(hash));
 905
 906     if ((cid = ESS_CERT_ID_V2_new()) == NULL)
 907         goto err;
 908
 909     if (hash_alg != EVP_sha256()) {
 910         alg = X509_ALGOR_new();
 911         if (alg == NULL)
 912             goto err;
 913         X509_ALGOR_set_md(alg, hash_alg);
 914         if (alg->algorithm == NULL)
 915             goto err;
 916         cid->hash_alg = alg;
 917         alg = NULL;
 918     } else {
 919         cid->hash_alg = NULL;
 920     }
 921
 922     if (!X509_digest(cert, hash_alg, hash, &hash_len))
 923         goto err;
 924
 925     if (!ASN1_OCTET_STRING_set(cid->hash, hash, hash_len))
 926         goto err;
 927
 928     if (issuer_needed) {
 929         if ((cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
 930             goto err;
 931         if ((name = GENERAL_NAME_new()) == NULL)
 932             goto err;
 933         name->type = GEN_DIRNAME;
 934         if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
 935             goto err;
 936         if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
 937             goto err;
 938         name = NULL;            /* Ownership is lost. */
 939         ASN1_INTEGER_free(cid->issuer_serial->serial);
 940         cid->issuer_serial->serial =
 941                 ASN1_INTEGER_dup(X509_get_serialNumber(cert));
 942         if (cid->issuer_serial->serial == NULL)
 943             goto err;
 944     }
 945
 946     return cid;
 947  err:
 948     X509_ALGOR_free(alg);
 949     GENERAL_NAME_free(name);
 950     ESS_CERT_ID_V2_free(cid);
 951     TSerr(TS_F_ESS_CERT_ID_V2_NEW_INIT, ERR_R_MALLOC_FAILURE);
 952     return NULL;
 953 }
 954
 955 static int ess_add_signing_cert_v2(PKCS7_SIGNER_INFO *si,
 956                                    ESS_SIGNING_CERT_V2 *sc)
 957 {
 958     ASN1_STRING *seq = NULL;
 959     unsigned char *p, *pp = NULL;
 960     int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 961
 962     if ((pp = OPENSSL_malloc(len)) == NULL) {
 963         TSerr(TS_F_ESS_ADD_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE);
 964         goto err;
 965     }
 966
 967     p = pp;
 968     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 969     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 970         TSerr(TS_F_ESS_ADD_SIGNING_CERT_V2, ERR_R_MALLOC_FAILURE);
 971         goto err;
 972     }
 973
 974     OPENSSL_free(pp);
 975     pp = NULL;
 976     return PKCS7_add_signed_attribute(si,
 977                                       NID_id_smime_aa_signingCertificateV2,
 978                                       V_ASN1_SEQUENCE, seq);
 979  err:
 980     ASN1_STRING_free(seq);
 981     OPENSSL_free(pp);
 982     return 0;
 983 }
 984
 985 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
 986         ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
 987         unsigned precision)
 988 {
 989     time_t time_sec = (time_t)sec;
 990     struct tm *tm = NULL, tm_result;
 991     char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
 992     char *p = genTime_str;
 993     char *p_end = genTime_str + sizeof(genTime_str);
 994
 995     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 996         goto err;
 997
 998     if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
 999         goto err;
1000
1001     /*
1002      * Put "genTime_str" in GeneralizedTime format.  We work around the
1003      * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
1004      * NOT include fractional seconds") and OpenSSL related functions to
1005      * meet the rfc3161 requirement: "GeneralizedTime syntax can include
1006      * fraction-of-second details".
1007      */
1008     p += BIO_snprintf(p, p_end - p,
1009                       "%04d%02d%02d%02d%02d%02d",
1010                       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
1011                       tm->tm_hour, tm->tm_min, tm->tm_sec);
1012     if (precision > 0) {
1013         BIO_snprintf(p, 2 + precision, ".%06ld", usec);
1014         p += strlen(p);
1015
1016         /*
1017          * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
1018          * following restrictions for a DER-encoding, which OpenSSL
1019          * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
1020          * support: "The encoding MUST terminate with a "Z" (which means
1021          * "Zulu" time). The decimal point element, if present, MUST be the
1022          * point option ".". The fractional-seconds elements, if present,
1023          * MUST omit all trailing 0's; if the elements correspond to 0, they
1024          * MUST be wholly omitted, and the decimal point element also MUST be
1025          * omitted."
1026          */
1027         /*
1028          * Remove trailing zeros. The dot guarantees the exit condition of
1029          * this loop even if all the digits are zero.
1030          */
1031         while (*--p == '0')
1032              continue;
1033         if (*p != '.')
1034             ++p;
1035     }
1036     *p++ = 'Z';
1037     *p++ = '\0';
1038
1039     if (asn1_time == NULL
1040         && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
1041         goto err;
1042     if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
1043         ASN1_GENERALIZEDTIME_free(asn1_time);
1044         goto err;
1045     }
1046     return asn1_time;
1047
1048  err:
1049     TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
1050     return NULL;
1051 }
1052
1053 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
1054 {
1055     ctx->ess_cert_id_digest = md;
1056     return 1;
1057 }