crypto/ts/ts_rsp_sign.c

   1 /*
   2  * Copyright 2006-2021 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
  12 #include <openssl/objects.h>
  13 #include <openssl/ts.h>
  14 #include <openssl/pkcs7.h>
  15 #include <openssl/crypto.h>
  16 #include "internal/cryptlib.h"
  17 #include "internal/sizes.h"
  18 #include "crypto/ess.h"
  19 #include "ts_local.h"
  20
  21 DEFINE_STACK_OF_CONST(EVP_MD)
  22
  23 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
  24 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
  25 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  26
  27 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx);
  28 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
  29 static int ts_RESP_check_request(TS_RESP_CTX *ctx);
  30 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx);
  31 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
  32                                             ASN1_OBJECT *policy);
  33 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx);
  34 static int ts_RESP_sign(TS_RESP_CTX *ctx);
  35
  36 static int ts_TST_INFO_content_new(PKCS7 *p7);
  37
  38 static ASN1_GENERALIZEDTIME
  39 *TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *, long, long,
  40                                     unsigned);
  41
  42 /* Default callback for response generation. */
  43 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
  44 {
  45     ASN1_INTEGER *serial = ASN1_INTEGER_new();
  46
  47     if (serial == NULL)
  48         goto err;
  49     if (!ASN1_INTEGER_set(serial, 1))
  50         goto err;
  51     return serial;
  52
  53  err:
  54     ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
  55     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  56                                 "Error during serial number generation.");
  57     ASN1_INTEGER_free(serial);
  58     return NULL;
  59 }
  60
  61 #if defined(OPENSSL_SYS_UNIX)
  62
  63 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  64                        long *sec, long *usec)
  65 {
  66     struct timeval tv;
  67     if (gettimeofday(&tv, NULL) != 0) {
  68         ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR);
  69         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  70                                     "Time is not available.");
  71         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  72         return 0;
  73     }
  74     *sec = tv.tv_sec;
  75     *usec = tv.tv_usec;
  76
  77     return 1;
  78 }
  79
  80 #else
  81
  82 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
  83                        long *sec, long *usec)
  84 {
  85     time_t t;
  86     if (time(&t) == (time_t)-1) {
  87         ERR_raise(ERR_LIB_TS, TS_R_TIME_SYSCALL_ERROR);
  88         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
  89                                     "Time is not available.");
  90         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
  91         return 0;
  92     }
  93     *sec = (long)t;
  94     *usec = 0;
  95
  96     return 1;
  97 }
  98
  99 #endif
 100
 101 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
 102                             void *data)
 103 {
 104     TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 105                                 "Unsupported extension.");
 106     TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
 107     return 0;
 108 }
 109
 110 /* TS_RESP_CTX management functions. */
 111
 112 TS_RESP_CTX *TS_RESP_CTX_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
 113 {
 114     TS_RESP_CTX *ctx;
 115
 116     if ((ctx = OPENSSL_zalloc(sizeof(*ctx))) == NULL) {
 117         ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 118         return NULL;
 119     }
 120
 121     if (propq != NULL) {
 122         ctx->propq = OPENSSL_strdup(propq);
 123         if (ctx->propq == NULL) {
 124             OPENSSL_free(ctx);
 125             ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 126             return NULL;
 127         }
 128     }
 129     ctx->libctx = libctx;
 130     ctx->serial_cb = def_serial_cb;
 131     ctx->time_cb = def_time_cb;
 132     ctx->extension_cb = def_extension_cb;
 133
 134     return ctx;
 135 }
 136
 137 TS_RESP_CTX *TS_RESP_CTX_new(void)
 138 {
 139     return TS_RESP_CTX_new_ex(NULL, NULL);
 140 }
 141
 142 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
 143 {
 144     if (!ctx)
 145         return;
 146
 147     OPENSSL_free(ctx->propq);
 148     X509_free(ctx->signer_cert);
 149     EVP_PKEY_free(ctx->signer_key);
 150     sk_X509_pop_free(ctx->certs, X509_free);
 151     sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
 152     ASN1_OBJECT_free(ctx->default_policy);
 153     sk_EVP_MD_free(ctx->mds);   /* No EVP_MD_free method exists. */
 154     ASN1_INTEGER_free(ctx->seconds);
 155     ASN1_INTEGER_free(ctx->millis);
 156     ASN1_INTEGER_free(ctx->micros);
 157     OPENSSL_free(ctx);
 158 }
 159
 160 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
 161 {
 162     if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1) {
 163         ERR_raise(ERR_LIB_TS, TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
 164         return 0;
 165     }
 166     X509_free(ctx->signer_cert);
 167     ctx->signer_cert = signer;
 168     X509_up_ref(ctx->signer_cert);
 169     return 1;
 170 }
 171
 172 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
 173 {
 174     EVP_PKEY_free(ctx->signer_key);
 175     ctx->signer_key = key;
 176     EVP_PKEY_up_ref(ctx->signer_key);
 177
 178     return 1;
 179 }
 180
 181 int TS_RESP_CTX_set_signer_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 182 {
 183     ctx->signer_md = md;
 184     return 1;
 185 }
 186
 187 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *def_policy)
 188 {
 189     ASN1_OBJECT_free(ctx->default_policy);
 190     if ((ctx->default_policy = OBJ_dup(def_policy)) == NULL)
 191         goto err;
 192     return 1;
 193  err:
 194     ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 195     return 0;
 196 }
 197
 198 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
 199 {
 200     sk_X509_pop_free(ctx->certs, X509_free);
 201     ctx->certs = NULL;
 202
 203     return certs == NULL || (ctx->certs = X509_chain_up_ref(certs)) != NULL;
 204 }
 205
 206 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, const ASN1_OBJECT *policy)
 207 {
 208     ASN1_OBJECT *copy = NULL;
 209
 210     if (ctx->policies == NULL
 211         && (ctx->policies = sk_ASN1_OBJECT_new_null()) == NULL)
 212         goto err;
 213     if ((copy = OBJ_dup(policy)) == NULL)
 214         goto err;
 215     if (!sk_ASN1_OBJECT_push(ctx->policies, copy))
 216         goto err;
 217
 218     return 1;
 219  err:
 220     ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 221     ASN1_OBJECT_free(copy);
 222     return 0;
 223 }
 224
 225 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
 226 {
 227     if (ctx->mds == NULL
 228         && (ctx->mds = sk_EVP_MD_new_null()) == NULL)
 229         goto err;
 230     if (!sk_EVP_MD_push(ctx->mds, md))
 231         goto err;
 232
 233     return 1;
 234  err:
 235     ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 236     return 0;
 237 }
 238
 239 #define TS_RESP_CTX_accuracy_free(ctx)          \
 240         ASN1_INTEGER_free(ctx->seconds);        \
 241         ctx->seconds = NULL;                    \
 242         ASN1_INTEGER_free(ctx->millis);         \
 243         ctx->millis = NULL;                     \
 244         ASN1_INTEGER_free(ctx->micros);         \
 245         ctx->micros = NULL;
 246
 247 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
 248                              int secs, int millis, int micros)
 249 {
 250
 251     TS_RESP_CTX_accuracy_free(ctx);
 252     if (secs
 253         && ((ctx->seconds = ASN1_INTEGER_new()) == NULL
 254             || !ASN1_INTEGER_set(ctx->seconds, secs)))
 255         goto err;
 256     if (millis
 257         && ((ctx->millis = ASN1_INTEGER_new()) == NULL
 258             || !ASN1_INTEGER_set(ctx->millis, millis)))
 259         goto err;
 260     if (micros
 261         && ((ctx->micros = ASN1_INTEGER_new()) == NULL
 262             || !ASN1_INTEGER_set(ctx->micros, micros)))
 263         goto err;
 264
 265     return 1;
 266  err:
 267     TS_RESP_CTX_accuracy_free(ctx);
 268     ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 269     return 0;
 270 }
 271
 272 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
 273 {
 274     ctx->flags |= flags;
 275 }
 276
 277 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
 278 {
 279     ctx->serial_cb = cb;
 280     ctx->serial_cb_data = data;
 281 }
 282
 283 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
 284 {
 285     ctx->time_cb = cb;
 286     ctx->time_cb_data = data;
 287 }
 288
 289 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
 290                                   TS_extension_cb cb, void *data)
 291 {
 292     ctx->extension_cb = cb;
 293     ctx->extension_cb_data = data;
 294 }
 295
 296 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
 297                                 int status, const char *text)
 298 {
 299     TS_STATUS_INFO *si = NULL;
 300     ASN1_UTF8STRING *utf8_text = NULL;
 301     int ret = 0;
 302
 303     if ((si = TS_STATUS_INFO_new()) == NULL)
 304         goto err;
 305     if (!ASN1_INTEGER_set(si->status, status))
 306         goto err;
 307     if (text) {
 308         if ((utf8_text = ASN1_UTF8STRING_new()) == NULL
 309             || !ASN1_STRING_set(utf8_text, text, strlen(text)))
 310             goto err;
 311         if (si->text == NULL
 312             && (si->text = sk_ASN1_UTF8STRING_new_null()) == NULL)
 313             goto err;
 314         if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text))
 315             goto err;
 316         utf8_text = NULL;       /* Ownership is lost. */
 317     }
 318     if (!TS_RESP_set_status_info(ctx->response, si))
 319         goto err;
 320     ret = 1;
 321  err:
 322     if (!ret)
 323         ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 324     TS_STATUS_INFO_free(si);
 325     ASN1_UTF8STRING_free(utf8_text);
 326     return ret;
 327 }
 328
 329 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
 330                                      int status, const char *text)
 331 {
 332     int ret = 1;
 333     TS_STATUS_INFO *si = ctx->response->status_info;
 334
 335     if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED) {
 336         ret = TS_RESP_CTX_set_status_info(ctx, status, text);
 337     }
 338     return ret;
 339 }
 340
 341 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
 342 {
 343     TS_STATUS_INFO *si = ctx->response->status_info;
 344     if (si->failure_info == NULL
 345         && (si->failure_info = ASN1_BIT_STRING_new()) == NULL)
 346         goto err;
 347     if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
 348         goto err;
 349     return 1;
 350  err:
 351     ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 352     return 0;
 353 }
 354
 355 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
 356 {
 357     return ctx->request;
 358 }
 359
 360 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
 361 {
 362     return ctx->tst_info;
 363 }
 364
 365 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx,
 366                                            unsigned precision)
 367 {
 368     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 369         return 0;
 370     ctx->clock_precision_digits = precision;
 371     return 1;
 372 }
 373
 374 /* Main entry method of the response generation. */
 375 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
 376 {
 377     ASN1_OBJECT *policy;
 378     TS_RESP *response;
 379     int result = 0;
 380
 381     ts_RESP_CTX_init(ctx);
 382
 383     if ((ctx->response = TS_RESP_new()) == NULL) {
 384         ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 385         goto end;
 386     }
 387     if ((ctx->request = d2i_TS_REQ_bio(req_bio, NULL)) == NULL) {
 388         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 389                                     "Bad request format or system error.");
 390         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 391         goto end;
 392     }
 393     if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
 394         goto end;
 395     if (!ts_RESP_check_request(ctx))
 396         goto end;
 397     if ((policy = ts_RESP_get_policy(ctx)) == NULL)
 398         goto end;
 399     if ((ctx->tst_info = ts_RESP_create_tst_info(ctx, policy)) == NULL)
 400         goto end;
 401     if (!ts_RESP_process_extensions(ctx))
 402         goto end;
 403     if (!ts_RESP_sign(ctx))
 404         goto end;
 405     result = 1;
 406
 407  end:
 408     if (!result) {
 409         ERR_raise(ERR_LIB_TS, TS_R_RESPONSE_SETUP_ERROR);
 410         if (ctx->response != NULL) {
 411             if (TS_RESP_CTX_set_status_info_cond(ctx,
 412                                                  TS_STATUS_REJECTION,
 413                                                  "Error during response "
 414                                                  "generation.") == 0) {
 415                 TS_RESP_free(ctx->response);
 416                 ctx->response = NULL;
 417             }
 418         }
 419     }
 420     response = ctx->response;
 421     ctx->response = NULL;       /* Ownership will be returned to caller. */
 422     ts_RESP_CTX_cleanup(ctx);
 423     return response;
 424 }
 425
 426 /* Initializes the variable part of the context. */
 427 static void ts_RESP_CTX_init(TS_RESP_CTX *ctx)
 428 {
 429     ctx->request = NULL;
 430     ctx->response = NULL;
 431     ctx->tst_info = NULL;
 432 }
 433
 434 /* Cleans up the variable part of the context. */
 435 static void ts_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
 436 {
 437     TS_REQ_free(ctx->request);
 438     ctx->request = NULL;
 439     TS_RESP_free(ctx->response);
 440     ctx->response = NULL;
 441     TS_TST_INFO_free(ctx->tst_info);
 442     ctx->tst_info = NULL;
 443 }
 444
 445 /* Checks the format and content of the request. */
 446 static int ts_RESP_check_request(TS_RESP_CTX *ctx)
 447 {
 448     TS_REQ *request = ctx->request;
 449     TS_MSG_IMPRINT *msg_imprint;
 450     X509_ALGOR *md_alg;
 451     char md_alg_name[OSSL_MAX_NAME_SIZE];
 452     const ASN1_OCTET_STRING *digest;
 453     const EVP_MD *md = NULL;
 454     int i;
 455
 456     if (TS_REQ_get_version(request) != 1) {
 457         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 458                                     "Bad request version.");
 459         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
 460         return 0;
 461     }
 462
 463     msg_imprint = request->msg_imprint;
 464     md_alg = msg_imprint->hash_algo;
 465     OBJ_obj2txt(md_alg_name, sizeof(md_alg_name), md_alg->algorithm, 0);
 466     for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i) {
 467         const EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
 468         if (EVP_MD_is_a(current_md, md_alg_name))
 469             md = current_md;
 470     }
 471     if (!md) {
 472         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 473                                     "Message digest algorithm is "
 474                                     "not supported.");
 475         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 476         return 0;
 477     }
 478
 479     if (md_alg->parameter && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL) {
 480         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 481                                     "Superfluous message digest "
 482                                     "parameter.");
 483         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 484         return 0;
 485     }
 486     digest = msg_imprint->hashed_msg;
 487     if (digest->length != EVP_MD_get_size(md)) {
 488         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 489                                     "Bad message digest.");
 490         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 491         return 0;
 492     }
 493
 494     return 1;
 495 }
 496
 497 /* Returns the TSA policy based on the requested and acceptable policies. */
 498 static ASN1_OBJECT *ts_RESP_get_policy(TS_RESP_CTX *ctx)
 499 {
 500     ASN1_OBJECT *requested = ctx->request->policy_id;
 501     ASN1_OBJECT *policy = NULL;
 502     int i;
 503
 504     if (ctx->default_policy == NULL) {
 505         ERR_raise(ERR_LIB_TS, TS_R_INVALID_NULL_POINTER);
 506         return NULL;
 507     }
 508     if (!requested || !OBJ_cmp(requested, ctx->default_policy))
 509         policy = ctx->default_policy;
 510
 511     /* Check if the policy is acceptable. */
 512     for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i) {
 513         ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
 514         if (!OBJ_cmp(requested, current))
 515             policy = current;
 516     }
 517     if (policy == NULL) {
 518         ERR_raise(ERR_LIB_TS, TS_R_UNACCEPTABLE_POLICY);
 519         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 520                                     "Requested policy is not " "supported.");
 521         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
 522     }
 523     return policy;
 524 }
 525
 526 /* Creates the TS_TST_INFO object based on the settings of the context. */
 527 static TS_TST_INFO *ts_RESP_create_tst_info(TS_RESP_CTX *ctx,
 528                                             ASN1_OBJECT *policy)
 529 {
 530     int result = 0;
 531     TS_TST_INFO *tst_info = NULL;
 532     ASN1_INTEGER *serial = NULL;
 533     ASN1_GENERALIZEDTIME *asn1_time = NULL;
 534     long sec, usec;
 535     TS_ACCURACY *accuracy = NULL;
 536     const ASN1_INTEGER *nonce;
 537     GENERAL_NAME *tsa_name = NULL;
 538
 539     if ((tst_info = TS_TST_INFO_new()) == NULL)
 540         goto end;
 541     if (!TS_TST_INFO_set_version(tst_info, 1))
 542         goto end;
 543     if (!TS_TST_INFO_set_policy_id(tst_info, policy))
 544         goto end;
 545     if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
 546         goto end;
 547     if ((serial = ctx->serial_cb(ctx, ctx->serial_cb_data)) == NULL
 548         || !TS_TST_INFO_set_serial(tst_info, serial))
 549         goto end;
 550     if (!ctx->time_cb(ctx, ctx->time_cb_data, &sec, &usec)
 551         || (asn1_time =
 552             TS_RESP_set_genTime_with_precision(NULL, sec, usec,
 553                                         ctx->clock_precision_digits)) == NULL
 554         || !TS_TST_INFO_set_time(tst_info, asn1_time))
 555         goto end;
 556
 557     if ((ctx->seconds || ctx->millis || ctx->micros)
 558         && (accuracy = TS_ACCURACY_new()) == NULL)
 559         goto end;
 560     if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
 561         goto end;
 562     if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
 563         goto end;
 564     if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
 565         goto end;
 566     if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
 567         goto end;
 568
 569     if ((ctx->flags & TS_ORDERING)
 570         && !TS_TST_INFO_set_ordering(tst_info, 1))
 571         goto end;
 572
 573     if ((nonce = ctx->request->nonce) != NULL
 574         && !TS_TST_INFO_set_nonce(tst_info, nonce))
 575         goto end;
 576
 577     if (ctx->flags & TS_TSA_NAME) {
 578         if ((tsa_name = GENERAL_NAME_new()) == NULL)
 579             goto end;
 580         tsa_name->type = GEN_DIRNAME;
 581         tsa_name->d.dirn =
 582             X509_NAME_dup(X509_get_subject_name(ctx->signer_cert));
 583         if (!tsa_name->d.dirn)
 584             goto end;
 585         if (!TS_TST_INFO_set_tsa(tst_info, tsa_name))
 586             goto end;
 587     }
 588
 589     result = 1;
 590  end:
 591     if (!result) {
 592         TS_TST_INFO_free(tst_info);
 593         tst_info = NULL;
 594         ERR_raise(ERR_LIB_TS, TS_R_TST_INFO_SETUP_ERROR);
 595         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 596                                          "Error during TSTInfo "
 597                                          "generation.");
 598     }
 599     GENERAL_NAME_free(tsa_name);
 600     TS_ACCURACY_free(accuracy);
 601     ASN1_GENERALIZEDTIME_free(asn1_time);
 602     ASN1_INTEGER_free(serial);
 603
 604     return tst_info;
 605 }
 606
 607 /* Processing the extensions of the request. */
 608 static int ts_RESP_process_extensions(TS_RESP_CTX *ctx)
 609 {
 610     STACK_OF(X509_EXTENSION) *exts = ctx->request->extensions;
 611     int i;
 612     int ok = 1;
 613
 614     for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i) {
 615         X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
 616         /*
 617          * The last argument was previously (void *)ctx->extension_cb,
 618          * but ISO C doesn't permit converting a function pointer to void *.
 619          * For lack of better information, I'm placing a NULL there instead.
 620          * The callback can pick its own address out from the ctx anyway...
 621          */
 622         ok = (*ctx->extension_cb) (ctx, ext, NULL);
 623     }
 624
 625     return ok;
 626 }
 627
 628 /* Functions for signing the TS_TST_INFO structure of the context. */
 629 static int ossl_ess_add1_signing_cert(PKCS7_SIGNER_INFO *si,
 630                                       const ESS_SIGNING_CERT *sc)
 631 {
 632     ASN1_STRING *seq = NULL;
 633     int len = i2d_ESS_SIGNING_CERT(sc, NULL);
 634     unsigned char *p, *pp = OPENSSL_malloc(len);
 635
 636     if (pp == NULL)
 637         return 0;
 638
 639     p = pp;
 640     i2d_ESS_SIGNING_CERT(sc, &p);
 641     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 642         ASN1_STRING_free(seq);
 643         OPENSSL_free(pp);
 644         return 0;
 645     }
 646
 647     OPENSSL_free(pp);
 648     return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificate,
 649                                       V_ASN1_SEQUENCE, seq);
 650 }
 651
 652 static int ossl_ess_add1_signing_cert_v2(PKCS7_SIGNER_INFO *si,
 653                                          const ESS_SIGNING_CERT_V2 *sc)
 654 {
 655     ASN1_STRING *seq = NULL;
 656     int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 657     unsigned char *p, *pp = OPENSSL_malloc(len);
 658
 659     if (pp == NULL)
 660         return 0;
 661
 662     p = pp;
 663     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 664     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 665         ASN1_STRING_free(seq);
 666         OPENSSL_free(pp);
 667         return 0;
 668     }
 669
 670     OPENSSL_free(pp);
 671     return PKCS7_add_signed_attribute(si, NID_id_smime_aa_signingCertificateV2,
 672                                       V_ASN1_SEQUENCE, seq);
 673 }
 674
 675 static int ts_RESP_sign(TS_RESP_CTX *ctx)
 676 {
 677     int ret = 0;
 678     PKCS7 *p7 = NULL;
 679     PKCS7_SIGNER_INFO *si;
 680     STACK_OF(X509) *certs;      /* Certificates to include in sc. */
 681     ESS_SIGNING_CERT_V2 *sc2 = NULL;
 682     ESS_SIGNING_CERT *sc = NULL;
 683     ASN1_OBJECT *oid;
 684     BIO *p7bio = NULL;
 685     int i;
 686     EVP_MD *signer_md = NULL;
 687
 688     if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
 689         ERR_raise(ERR_LIB_TS, TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 690         goto err;
 691     }
 692
 693     if ((p7 = PKCS7_new_ex(ctx->libctx, ctx->propq)) == NULL) {
 694         ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 695         goto err;
 696     }
 697     if (!PKCS7_set_type(p7, NID_pkcs7_signed))
 698         goto err;
 699     if (!ASN1_INTEGER_set(p7->d.sign->version, 3))
 700         goto err;
 701
 702     if (ctx->request->cert_req) {
 703         PKCS7_add_certificate(p7, ctx->signer_cert);
 704         if (ctx->certs) {
 705             for (i = 0; i < sk_X509_num(ctx->certs); ++i) {
 706                 X509 *cert = sk_X509_value(ctx->certs, i);
 707                 PKCS7_add_certificate(p7, cert);
 708             }
 709         }
 710     }
 711
 712     if (ctx->signer_md == NULL)
 713         signer_md = EVP_MD_fetch(ctx->libctx, "SHA256", ctx->propq);
 714     else if (EVP_MD_get0_provider(ctx->signer_md) == NULL)
 715         signer_md = EVP_MD_fetch(ctx->libctx, EVP_MD_get0_name(ctx->signer_md),
 716                                  ctx->propq);
 717     else
 718         signer_md = (EVP_MD *)ctx->signer_md;
 719
 720     if ((si = PKCS7_add_signature(p7, ctx->signer_cert,
 721                                   ctx->signer_key, signer_md)) == NULL) {
 722         ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
 723         goto err;
 724     }
 725
 726     oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 727     if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 728                                     V_ASN1_OBJECT, oid)) {
 729         ERR_raise(ERR_LIB_TS, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
 730         goto err;
 731     }
 732
 733     certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
 734     if (ctx->ess_cert_id_digest == NULL
 735         || EVP_MD_is_a(ctx->ess_cert_id_digest, SN_sha1)) {
 736         if ((sc = OSSL_ESS_signing_cert_new_init(ctx->signer_cert,
 737                                                  certs, 0)) == NULL)
 738             goto err;
 739
 740         if (!ossl_ess_add1_signing_cert(si, sc)) {
 741             ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
 742             goto err;
 743         }
 744     } else {
 745         sc2 = OSSL_ESS_signing_cert_v2_new_init(ctx->ess_cert_id_digest,
 746                                                 ctx->signer_cert, certs, 0);
 747         if (sc2 == NULL)
 748             goto err;
 749
 750         if (!ossl_ess_add1_signing_cert_v2(si, sc2)) {
 751             ERR_raise(ERR_LIB_TS, TS_R_ESS_ADD_SIGNING_CERT_V2_ERROR);
 752             goto err;
 753         }
 754     }
 755
 756     if (!ts_TST_INFO_content_new(p7))
 757         goto err;
 758     if ((p7bio = PKCS7_dataInit(p7, NULL)) == NULL) {
 759         ERR_raise(ERR_LIB_TS, ERR_R_MALLOC_FAILURE);
 760         goto err;
 761     }
 762     if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info)) {
 763         ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
 764         goto err;
 765     }
 766     if (!PKCS7_dataFinal(p7, p7bio)) {
 767         ERR_raise(ERR_LIB_TS, TS_R_TS_DATASIGN);
 768         goto err;
 769     }
 770     TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
 771     p7 = NULL;                  /* Ownership is lost. */
 772     ctx->tst_info = NULL;       /* Ownership is lost. */
 773
 774     ret = 1;
 775  err:
 776     if (signer_md != ctx->signer_md)
 777         EVP_MD_free(signer_md);
 778
 779     if (!ret)
 780         TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 781                                          "Error during signature "
 782                                          "generation.");
 783     BIO_free_all(p7bio);
 784     ESS_SIGNING_CERT_V2_free(sc2);
 785     ESS_SIGNING_CERT_free(sc);
 786     PKCS7_free(p7);
 787     return ret;
 788 }
 789
 790 static int ts_TST_INFO_content_new(PKCS7 *p7)
 791 {
 792     PKCS7 *ret = NULL;
 793     ASN1_OCTET_STRING *octet_string = NULL;
 794
 795     /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
 796     if ((ret = PKCS7_new()) == NULL)
 797         goto err;
 798     if ((ret->d.other = ASN1_TYPE_new()) == NULL)
 799         goto err;
 800     ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 801     if ((octet_string = ASN1_OCTET_STRING_new()) == NULL)
 802         goto err;
 803     ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
 804     octet_string = NULL;
 805
 806     /* Add encapsulated content to signed PKCS7 structure. */
 807     if (!PKCS7_set_content(p7, ret))
 808         goto err;
 809
 810     return 1;
 811  err:
 812     ASN1_OCTET_STRING_free(octet_string);
 813     PKCS7_free(ret);
 814     return 0;
 815 }
 816
 817 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
 818         ASN1_GENERALIZEDTIME *asn1_time, long sec, long usec,
 819         unsigned precision)
 820 {
 821     time_t time_sec = (time_t)sec;
 822     struct tm *tm = NULL, tm_result;
 823     char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
 824     char *p = genTime_str;
 825     char *p_end = genTime_str + sizeof(genTime_str);
 826
 827     if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 828         goto err;
 829
 830     if ((tm = OPENSSL_gmtime(&time_sec, &tm_result)) == NULL)
 831         goto err;
 832
 833     /*
 834      * Put "genTime_str" in GeneralizedTime format.  We work around the
 835      * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
 836      * NOT include fractional seconds") and OpenSSL related functions to
 837      * meet the rfc3161 requirement: "GeneralizedTime syntax can include
 838      * fraction-of-second details".
 839      */
 840     p += BIO_snprintf(p, p_end - p,
 841                       "%04d%02d%02d%02d%02d%02d",
 842                       tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 843                       tm->tm_hour, tm->tm_min, tm->tm_sec);
 844     if (precision > 0) {
 845         BIO_snprintf(p, 2 + precision, ".%06ld", usec);
 846         p += strlen(p);
 847
 848         /*
 849          * To make things a bit harder, X.690 | ISO/IEC 8825-1 provides the
 850          * following restrictions for a DER-encoding, which OpenSSL
 851          * (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
 852          * support: "The encoding MUST terminate with a "Z" (which means
 853          * "Zulu" time). The decimal point element, if present, MUST be the
 854          * point option ".". The fractional-seconds elements, if present,
 855          * MUST omit all trailing 0's; if the elements correspond to 0, they
 856          * MUST be wholly omitted, and the decimal point element also MUST be
 857          * omitted."
 858          */
 859         /*
 860          * Remove trailing zeros. The dot guarantees the exit condition of
 861          * this loop even if all the digits are zero.
 862          */
 863         while (*--p == '0')
 864              continue;
 865         if (*p != '.')
 866             ++p;
 867     }
 868     *p++ = 'Z';
 869     *p++ = '\0';
 870
 871     if (asn1_time == NULL
 872         && (asn1_time = ASN1_GENERALIZEDTIME_new()) == NULL)
 873         goto err;
 874     if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str)) {
 875         ASN1_GENERALIZEDTIME_free(asn1_time);
 876         goto err;
 877     }
 878     return asn1_time;
 879
 880  err:
 881     ERR_raise(ERR_LIB_TS, TS_R_COULD_NOT_SET_TIME);
 882     return NULL;
 883 }
 884
 885 int TS_RESP_CTX_set_ess_cert_id_digest(TS_RESP_CTX *ctx, const EVP_MD *md)
 886 {
 887     ctx->ess_cert_id_digest = md;
 888     return 1;
 889 }