1 /* crypto/ts/ts_resp_sign.c */
   2 /* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
   3  * project 2002.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58 
  59 #include "cryptlib.h"
  60 
  61 #if defined(OPENSSL_SYS_UNIX)
  62 #include <sys/time.h>
  63 #endif
  64 
  65 #include <openssl/objects.h>
  66 #include <openssl/ts.h>
  67 #include <openssl/pkcs7.h>
  68 
  69 /* Private function declarations. */
  70 
  71 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
  72 static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
  73 static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);
  74 
  75 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
  76 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
  77 static int TS_RESP_check_request(TS_RESP_CTX *ctx);
  78 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
  79 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
  80                                             ASN1_OBJECT *policy);
  81 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
  82 static int TS_RESP_sign(TS_RESP_CTX *ctx);
  83 
  84 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
  85                                                    STACK_OF(X509) *certs);
  86 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
  87 static int TS_TST_INFO_content_new(PKCS7 *p7);
  88 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);
  89 
  90 static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
  91         ASN1_GENERALIZEDTIME *, long, long, unsigned);
  92 
  93 /* Default callbacks for response generation. */
  94 
  95 static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
  96         {
  97         ASN1_INTEGER *serial = ASN1_INTEGER_new();
  98         if (!serial) goto err;
  99         if (!ASN1_INTEGER_set(serial, 1)) goto err;
 100         return serial;
 101  err:
 102         TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
 103         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 104                                     "Error during serial number generation.");
 105         return NULL;
 106         }
 107 
 108 #if defined(OPENSSL_SYS_UNIX)
 109 
 110 /* Use the gettimeofday function call. */
 111 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
 112                        long *sec, long *usec)
 113         {
 114         struct timeval tv;
 115         if (gettimeofday(&tv, NULL) != 0)
 116                 {
 117                 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
 118                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 119                                             "Time is not available.");
 120                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
 121                 return 0;
 122                 }
 123         /* Return time to caller. */
 124         *sec = tv.tv_sec;
 125         *usec = tv.tv_usec;
 126 
 127         return 1;
 128         }
 129 
 130 #else
 131 
 132 /* Use the time function call that provides only seconds precision. */
 133 static int def_time_cb(struct TS_resp_ctx *ctx, void *data,
 134                        long *sec, long *usec)
 135         {
 136         time_t t;
 137         if (time(&t) == (time_t) -1)
 138                 {
 139                 TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
 140                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 141                                             "Time is not available.");
 142                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
 143                 return 0;
 144                 }
 145         /* Return time to caller, only second precision. */
 146         *sec = (long) t;
 147         *usec = 0;
 148 
 149         return 1;
 150         }
 151 
 152 #endif
 153 
 154 static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
 155                             void *data)
 156         {
 157         /* No extensions are processed here. */
 158         TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 159                                     "Unsupported extension.");
 160         TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
 161         return 0;
 162         }
 163 
 164 /* TS_RESP_CTX management functions. */
 165 
 166 TS_RESP_CTX *TS_RESP_CTX_new()
 167         {
 168         TS_RESP_CTX *ctx;
 169 
 170         if (!(ctx = (TS_RESP_CTX *) OPENSSL_malloc(sizeof(TS_RESP_CTX))))
 171                 {
 172                 TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
 173                 return NULL;
 174                 }
 175         memset(ctx, 0, sizeof(TS_RESP_CTX));
 176 
 177         /* Setting default callbacks. */
 178         ctx->serial_cb = def_serial_cb;
 179         ctx->time_cb = def_time_cb;
 180         ctx->extension_cb = def_extension_cb;
 181 
 182         return ctx;
 183         }
 184 
 185 void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
 186         {
 187         if (!ctx) return;
 188 
 189         X509_free(ctx->signer_cert);
 190         EVP_PKEY_free(ctx->signer_key);
 191         sk_X509_pop_free(ctx->certs, X509_free);
 192         sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
 193         ASN1_OBJECT_free(ctx->default_policy);
 194         sk_EVP_MD_free(ctx->mds);    /* No EVP_MD_free method exists. */
 195         ASN1_INTEGER_free(ctx->seconds);
 196         ASN1_INTEGER_free(ctx->millis);
 197         ASN1_INTEGER_free(ctx->micros);
 198         OPENSSL_free(ctx);
 199         }
 200 
 201 int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
 202         {
 203         if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1)
 204                 {
 205                 TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT,
 206                       TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
 207                 return 0;
 208                 }
 209         if (ctx->signer_cert) X509_free(ctx->signer_cert);
 210         ctx->signer_cert = signer;
 211         CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
 212         return 1;
 213         }
 214 
 215 int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
 216         {
 217         if (ctx->signer_key) EVP_PKEY_free(ctx->signer_key);
 218         ctx->signer_key = key;
 219         CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);
 220 
 221         return 1;
 222         }
 223 
 224 int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
 225         {
 226         if (ctx->default_policy) ASN1_OBJECT_free(ctx->default_policy);
 227         if (!(ctx->default_policy = OBJ_dup(def_policy))) goto err;
 228         return 1;
 229  err:
 230         TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
 231         return 0;
 232         }
 233 
 234 int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
 235         {
 236         int i;
 237 
 238         if (ctx->certs)
 239                 {
 240                 sk_X509_pop_free(ctx->certs, X509_free);
 241                 ctx->certs = NULL;
 242                 }
 243         if (!certs) return 1;
 244         if (!(ctx->certs = sk_X509_dup(certs)))
 245                 {
 246                 TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
 247                 return 0;
 248                 }
 249         for (i = 0; i < sk_X509_num(ctx->certs); ++i)
 250                 {
 251                 X509 *cert = sk_X509_value(ctx->certs, i);
 252                 CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
 253                 }
 254 
 255         return 1;
 256         }
 257 
 258 int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
 259         {
 260         ASN1_OBJECT *copy = NULL;
 261 
 262         /* Create new policy stack if necessary. */
 263         if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null()))
 264                 goto err;
 265         if (!(copy = OBJ_dup(policy))) goto err;
 266         if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) goto err;
 267 
 268         return 1;
 269  err:
 270         TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
 271         ASN1_OBJECT_free(copy);
 272         return 0;
 273         }
 274 
 275 int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
 276         {
 277         /* Create new md stack if necessary. */
 278         if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null()))
 279                 goto err;
 280         /* Add the shared md, no copy needed. */
 281         if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) goto err;
 282 
 283         return 1;
 284  err:
 285         TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
 286         return 0;
 287         }
 288 
 289 #define TS_RESP_CTX_accuracy_free(ctx)          \
 290         ASN1_INTEGER_free(ctx->seconds);     \
 291         ctx->seconds = NULL;                 \
 292         ASN1_INTEGER_free(ctx->millis);              \
 293         ctx->millis = NULL;                  \
 294         ASN1_INTEGER_free(ctx->micros);              \
 295         ctx->micros = NULL;
 296 
 297 int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx,
 298                              int secs, int millis, int micros)
 299         {
 300 
 301         TS_RESP_CTX_accuracy_free(ctx);
 302         if (secs && (!(ctx->seconds = ASN1_INTEGER_new())
 303                      || !ASN1_INTEGER_set(ctx->seconds, secs)))
 304                 goto err;
 305         if (millis && (!(ctx->millis = ASN1_INTEGER_new())
 306                        || !ASN1_INTEGER_set(ctx->millis, millis)))
 307                 goto err;
 308         if (micros && (!(ctx->micros = ASN1_INTEGER_new())
 309                        || !ASN1_INTEGER_set(ctx->micros, micros)))
 310                 goto err;
 311 
 312         return 1;
 313  err:
 314         TS_RESP_CTX_accuracy_free(ctx);
 315         TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
 316         return 0;
 317         }
 318 
 319 void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
 320         {
 321         ctx->flags |= flags;
 322         }
 323 
 324 void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
 325         {
 326         ctx->serial_cb = cb;
 327         ctx->serial_cb_data = data;
 328         }
 329 
 330 void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
 331         {
 332         ctx->time_cb = cb;
 333         ctx->time_cb_data = data;
 334         }
 335 
 336 void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx,
 337                                   TS_extension_cb cb, void *data)
 338         {
 339         ctx->extension_cb = cb;
 340         ctx->extension_cb_data = data;
 341         }
 342 
 343 int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx,
 344                                 int status, const char *text)
 345         {
 346         TS_STATUS_INFO *si = NULL;
 347         ASN1_UTF8STRING *utf8_text = NULL;
 348         int ret = 0;
 349 
 350         if (!(si = TS_STATUS_INFO_new())) goto err;
 351         if (!ASN1_INTEGER_set(si->status, status)) goto err;
 352         if (text)
 353                 {
 354                 if (!(utf8_text = ASN1_UTF8STRING_new())
 355                     || !ASN1_STRING_set(utf8_text, text, strlen(text)))
 356                         goto err;
 357                 if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
 358                         goto err;
 359                 if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) goto err;
 360                 utf8_text = NULL;       /* Ownership is lost. */
 361                 }
 362         if (!TS_RESP_set_status_info(ctx->response, si)) goto err;
 363         ret = 1;
 364  err:
 365         if (!ret)
 366                 TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
 367         TS_STATUS_INFO_free(si);
 368         ASN1_UTF8STRING_free(utf8_text);
 369         return ret;
 370         }
 371 
 372 int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx,
 373                                      int status, const char *text)
 374         {
 375         int ret = 1;
 376         TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
 377 
 378         if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED)
 379                 {
 380                 /* Status has not been set, set it now. */
 381                 ret = TS_RESP_CTX_set_status_info(ctx, status, text);
 382                 }
 383         return ret;
 384         }
 385 
 386 int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
 387         {
 388         TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
 389         if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
 390                 goto err;
 391         if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
 392                 goto err;
 393         return 1;
 394  err:
 395         TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
 396         return 0;
 397         }
 398 
 399 TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
 400         {
 401         return ctx->request;
 402         }
 403 
 404 TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
 405         {
 406         return ctx->tst_info;
 407         }
 408 
 409 int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
 410        {
 411        if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 412                return 0;
 413        ctx->clock_precision_digits = precision;
 414        return 1;
 415        }
 416 
 417 /* Main entry method of the response generation. */
 418 TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
 419         {
 420         ASN1_OBJECT *policy;
 421         TS_RESP *response;
 422         int result = 0;
 423 
 424         TS_RESP_CTX_init(ctx);
 425 
 426         /* Creating the response object. */
 427         if (!(ctx->response = TS_RESP_new()))
 428                 {
 429                 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
 430                 goto end;
 431                 }
 432 
 433         /* Parsing DER request. */
 434         if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL)))
 435                 {
 436                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 437                                             "Bad request format or "
 438                                             "system error.");
 439                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 440                 goto end;
 441                 }
 442 
 443         /* Setting default status info. */
 444         if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
 445                 goto end;
 446 
 447         /* Checking the request format. */
 448         if (!TS_RESP_check_request(ctx)) goto end;
 449 
 450         /* Checking acceptable policies. */
 451         if (!(policy = TS_RESP_get_policy(ctx))) goto end;
 452 
 453         /* Creating the TS_TST_INFO object. */
 454         if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
 455                 goto end;
 456 
 457         /* Processing extensions. */
 458         if (!TS_RESP_process_extensions(ctx)) goto end;
 459 
 460         /* Generating the signature. */
 461         if (!TS_RESP_sign(ctx)) goto end;
 462 
 463         /* Everything was successful. */
 464         result = 1;
 465  end:
 466         if (!result)
 467                 {
 468                 TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
 469                 if (ctx->response != NULL)
 470                         {
 471                         if (TS_RESP_CTX_set_status_info_cond(ctx,
 472                                 TS_STATUS_REJECTION, "Error during response "
 473                                 "generation.") == 0)
 474                                 {
 475                                 TS_RESP_free(ctx->response);
 476                                 ctx->response = NULL;
 477                                 }
 478                         }
 479                 }
 480         response = ctx->response;
 481         ctx->response = NULL;        /* Ownership will be returned to caller. */
 482         TS_RESP_CTX_cleanup(ctx);
 483         return response;
 484         }
 485 
 486 /* Initializes the variable part of the context. */
 487 static void TS_RESP_CTX_init(TS_RESP_CTX *ctx)
 488         {
 489         ctx->request = NULL;
 490         ctx->response = NULL;
 491         ctx->tst_info = NULL;
 492         }
 493 
 494 /* Cleans up the variable part of the context. */
 495 static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
 496         {
 497         TS_REQ_free(ctx->request);
 498         ctx->request = NULL;
 499         TS_RESP_free(ctx->response);
 500         ctx->response = NULL;
 501         TS_TST_INFO_free(ctx->tst_info);
 502         ctx->tst_info = NULL;
 503         }
 504 
 505 /* Checks the format and content of the request. */
 506 static int TS_RESP_check_request(TS_RESP_CTX *ctx)
 507         {
 508         TS_REQ *request = ctx->request;
 509         TS_MSG_IMPRINT *msg_imprint;
 510         X509_ALGOR *md_alg;
 511         int md_alg_id;
 512         const ASN1_OCTET_STRING *digest;
 513         EVP_MD *md = NULL;
 514         int i;
 515 
 516         /* Checking request version. */
 517         if (TS_REQ_get_version(request) != 1)
 518                 {
 519                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 520                                             "Bad request version.");
 521                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
 522                 return 0;
 523                 }
 524 
 525         /* Checking message digest algorithm. */
 526         msg_imprint = TS_REQ_get_msg_imprint(request);
 527         md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
 528         md_alg_id = OBJ_obj2nid(md_alg->algorithm);
 529         for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i)
 530                 {
 531                 EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
 532                 if (md_alg_id == EVP_MD_type(current_md))
 533                         md = current_md;
 534                 }
 535         if (!md)
 536                 {
 537                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 538                                             "Message digest algorithm is "
 539                                             "not supported.");
 540                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 541                 return 0;
 542                 }
 543 
 544         /* No message digest takes parameter. */
 545         if (md_alg->parameter
 546             && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL)
 547                 {
 548                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 549                                             "Superfluous message digest "
 550                                             "parameter.");
 551                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
 552                 return 0;
 553                 }
 554         /* Checking message digest size. */
 555         digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
 556         if (digest->length != EVP_MD_size(md))
 557                 {
 558                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 559                                             "Bad message digest.");
 560                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
 561                 return 0;
 562                 }
 563 
 564         return 1;
 565         }
 566 
 567 /* Returns the TSA policy based on the requested and acceptable policies. */
 568 static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx)
 569         {
 570         ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
 571         ASN1_OBJECT *policy = NULL;
 572         int i;
 573 
 574         if (ctx->default_policy == NULL)
 575                 {
 576                 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
 577                 return NULL;
 578                 }
 579         /* Return the default policy if none is requested or the default is
 580            requested. */
 581         if (!requested || !OBJ_cmp(requested, ctx->default_policy))
 582                 policy = ctx->default_policy;
 583 
 584         /* Check if the policy is acceptable. */
 585         for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i)
 586                 {
 587                 ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
 588                 if (!OBJ_cmp(requested, current))
 589                         policy = current;
 590                 }
 591         if (!policy)
 592                 {
 593                 TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
 594                 TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
 595                                             "Requested policy is not "
 596                                             "supported.");
 597                 TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
 598                 }
 599         return policy;
 600         }
 601 
 602 /* Creates the TS_TST_INFO object based on the settings of the context. */
 603 static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
 604                                             ASN1_OBJECT *policy)
 605         {
 606         int result = 0;
 607         TS_TST_INFO *tst_info = NULL;
 608         ASN1_INTEGER *serial = NULL;
 609         ASN1_GENERALIZEDTIME *asn1_time = NULL;
 610         long sec, usec;
 611         TS_ACCURACY *accuracy = NULL;
 612         const ASN1_INTEGER *nonce;
 613         GENERAL_NAME *tsa_name = NULL;
 614 
 615         if (!(tst_info = TS_TST_INFO_new())) goto end;
 616         if (!TS_TST_INFO_set_version(tst_info, 1)) goto end;
 617         if (!TS_TST_INFO_set_policy_id(tst_info, policy)) goto end;
 618         if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
 619                 goto end;
 620         if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data))
 621             || !TS_TST_INFO_set_serial(tst_info, serial))
 622                 goto end;
 623         if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec)
 624             || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL,
 625                                         sec, usec,
 626                                         ctx->clock_precision_digits))
 627             || !TS_TST_INFO_set_time(tst_info, asn1_time))
 628                 goto end;
 629 
 630         /* Setting accuracy if needed. */
 631         if ((ctx->seconds || ctx->millis || ctx->micros)
 632             && !(accuracy = TS_ACCURACY_new()))
 633                 goto end;
 634 
 635         if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
 636                 goto end;
 637         if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
 638                 goto end;
 639         if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
 640                 goto end;
 641         if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy))
 642                 goto end;
 643 
 644         /* Setting ordering. */
 645         if ((ctx->flags & TS_ORDERING)
 646             && !TS_TST_INFO_set_ordering(tst_info, 1))
 647                 goto end;
 648 
 649         /* Setting nonce if needed. */
 650         if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL
 651             && !TS_TST_INFO_set_nonce(tst_info, nonce))
 652                 goto end;
 653 
 654         /* Setting TSA name to subject of signer certificate. */
 655         if (ctx->flags & TS_TSA_NAME)
 656                 {
 657                 if (!(tsa_name = GENERAL_NAME_new())) goto end;
 658                 tsa_name->type = GEN_DIRNAME;
 659                 tsa_name->d.dirn =
 660                         X509_NAME_dup(ctx->signer_cert->cert_info->subject);
 661                 if (!tsa_name->d.dirn) goto end;
 662                 if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) goto end;
 663                 }
 664 
 665         result = 1;
 666  end:
 667         if (!result)
 668                 {
 669                 TS_TST_INFO_free(tst_info);
 670                 tst_info = NULL;
 671                 TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
 672                 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 673                                                  "Error during TSTInfo "
 674                                                  "generation.");
 675                 }
 676         GENERAL_NAME_free(tsa_name);
 677         TS_ACCURACY_free(accuracy);
 678         ASN1_GENERALIZEDTIME_free(asn1_time);
 679         ASN1_INTEGER_free(serial);
 680 
 681         return tst_info;
 682         }
 683 
 684 /* Processing the extensions of the request. */
 685 static int TS_RESP_process_extensions(TS_RESP_CTX *ctx)
 686         {
 687         STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
 688         int i;
 689         int ok = 1;
 690 
 691         for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i)
 692                 {
 693                 X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
 694                 /* XXXXX The last argument was previously
 695                    (void *)ctx->extension_cb, but ISO C doesn't permit
 696                    converting a function pointer to void *.  For lack of
 697                    better information, I'm placing a NULL there instead.
 698                    The callback can pick its own address out from the ctx
 699                    anyway...
 700                 */
 701                 ok = (*ctx->extension_cb)(ctx, ext, NULL);
 702                 }
 703 
 704         return ok;
 705         }
 706 
 707 /* Functions for signing the TS_TST_INFO structure of the context. */
 708 static int TS_RESP_sign(TS_RESP_CTX *ctx)
 709         {
 710         int ret = 0;
 711         PKCS7 *p7 = NULL;
 712         PKCS7_SIGNER_INFO *si;
 713         STACK_OF(X509) *certs;  /* Certificates to include in sc. */
 714         ESS_SIGNING_CERT *sc = NULL;
 715         ASN1_OBJECT *oid;
 716         BIO *p7bio = NULL;
 717         int i;
 718 
 719         /* Check if signcert and pkey match. */
 720         if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
 721                 TSerr(TS_F_TS_RESP_SIGN,
 722                       TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
 723                 goto err;
 724         }
 725 
 726         /* Create a new PKCS7 signed object. */
 727         if (!(p7 = PKCS7_new())) {
 728                 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 729                 goto err;
 730         }
 731         if (!PKCS7_set_type(p7, NID_pkcs7_signed)) goto err;
 732 
 733         /* Force SignedData version to be 3 instead of the default 1. */
 734         if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) goto err;
 735 
 736         /* Add signer certificate and optional certificate chain. */
 737         if (TS_REQ_get_cert_req(ctx->request))
 738                 {
 739                 PKCS7_add_certificate(p7, ctx->signer_cert);
 740                 if (ctx->certs)
 741                         {
 742                         for(i = 0; i < sk_X509_num(ctx->certs); ++i)
 743                                 {
 744                                 X509 *cert = sk_X509_value(ctx->certs, i);
 745                                 PKCS7_add_certificate(p7, cert);
 746                                 }
 747                         }
 748                 }
 749 
 750         /* Add a new signer info. */
 751         if (!(si = PKCS7_add_signature(p7, ctx->signer_cert,
 752                                        ctx->signer_key, EVP_sha1())))
 753                 {
 754                 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
 755                 goto err;
 756                 }
 757 
 758         /* Add content type signed attribute to the signer info. */
 759         oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 760         if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
 761                                         V_ASN1_OBJECT, oid))
 762                 {
 763                 TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
 764                 goto err;
 765                 }
 766 
 767         /* Create the ESS SigningCertificate attribute which contains
 768            the signer certificate id and optionally the certificate chain. */
 769         certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
 770         if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
 771                 goto err;
 772 
 773         /* Add SigningCertificate signed attribute to the signer info. */
 774         if (!ESS_add_signing_cert(si, sc))
 775                 {
 776                 TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
 777                 goto err;
 778                 }
 779 
 780         /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
 781         if (!TS_TST_INFO_content_new(p7)) goto err;
 782 
 783         /* Add the DER encoded tst_info to the PKCS7 structure. */
 784         if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
 785                 TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
 786                 goto err;
 787         }
 788 
 789         /* Convert tst_info to DER. */
 790         if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info))
 791                 {
 792                 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 793                 goto err;
 794                 }
 795 
 796         /* Create the signature and add it to the signer info. */
 797         if (!PKCS7_dataFinal(p7, p7bio))
 798                 {
 799                 TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
 800                 goto err;
 801                 }
 802 
 803         /* Set new PKCS7 and TST_INFO objects. */
 804         TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
 805         p7 = NULL;              /* Ownership is lost. */
 806         ctx->tst_info = NULL;        /* Ownership is lost. */
 807 
 808         ret = 1;
 809  err:
 810         if (!ret)
 811                 TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
 812                                                  "Error during signature "
 813                                                  "generation.");
 814         BIO_free_all(p7bio);
 815         ESS_SIGNING_CERT_free(sc);
 816         PKCS7_free(p7);
 817         return ret;
 818         }
 819 
 820 static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
 821                                                    STACK_OF(X509) *certs)
 822         {
 823         ESS_CERT_ID *cid;
 824         ESS_SIGNING_CERT *sc = NULL;
 825         int i;
 826 
 827         /* Creating the ESS_CERT_ID stack. */
 828         if (!(sc = ESS_SIGNING_CERT_new())) goto err;
 829         if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
 830                 goto err;
 831 
 832         /* Adding the signing certificate id. */
 833         if (!(cid = ESS_CERT_ID_new_init(signcert, 0))
 834             || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
 835                 goto err;
 836         /* Adding the certificate chain ids. */
 837         for (i = 0; i < sk_X509_num(certs); ++i)
 838                 {
 839                 X509 *cert = sk_X509_value(certs, i);
 840                 if (!(cid = ESS_CERT_ID_new_init(cert, 1))
 841                     || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
 842                         goto err;
 843                 }
 844 
 845         return sc;
 846 err:
 847         ESS_SIGNING_CERT_free(sc);
 848         TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
 849         return NULL;
 850         }
 851 
 852 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
 853         {
 854         ESS_CERT_ID *cid = NULL;
 855         GENERAL_NAME *name = NULL;
 856 
 857         /* Recompute SHA1 hash of certificate if necessary (side effect). */
 858         X509_check_purpose(cert, -1, 0);
 859 
 860         if (!(cid = ESS_CERT_ID_new())) goto err;
 861         if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash,
 862                                    sizeof(cert->sha1_hash)))
 863                 goto err;
 864 
 865         /* Setting the issuer/serial if requested. */
 866         if (issuer_needed)
 867                 {
 868                 /* Creating issuer/serial structure. */
 869                 if (!cid->issuer_serial
 870                     && !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
 871                         goto err;
 872                 /* Creating general name from the certificate issuer. */
 873                 if (!(name = GENERAL_NAME_new())) goto err;
 874                 name->type = GEN_DIRNAME;
 875                 if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer)))
 876                         goto err;
 877                 if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
 878                         goto err;
 879                 name = NULL;    /* Ownership is lost. */
 880                 /* Setting the serial number. */
 881                 ASN1_INTEGER_free(cid->issuer_serial->serial);
 882                 if (!(cid->issuer_serial->serial =
 883                       ASN1_INTEGER_dup(cert->cert_info->serialNumber)))
 884                         goto err;
 885                 }
 886 
 887         return cid;
 888 err:
 889         GENERAL_NAME_free(name);
 890         ESS_CERT_ID_free(cid);
 891         TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
 892         return NULL;
 893         }
 894 
 895 static int TS_TST_INFO_content_new(PKCS7 *p7)
 896         {
 897         PKCS7 *ret = NULL;
 898         ASN1_OCTET_STRING *octet_string = NULL;
 899 
 900         /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
 901         if (!(ret = PKCS7_new())) goto err;
 902         if (!(ret->d.other = ASN1_TYPE_new())) goto err;
 903         ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
 904         if (!(octet_string = ASN1_OCTET_STRING_new())) goto err;
 905         ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
 906         octet_string = NULL;
 907 
 908         /* Add encapsulated content to signed PKCS7 structure. */
 909         if (!PKCS7_set_content(p7, ret)) goto err;
 910 
 911         return 1;
 912  err:
 913         ASN1_OCTET_STRING_free(octet_string);
 914         PKCS7_free(ret);
 915         return 0;
 916         }
 917 
 918 static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
 919         {
 920         ASN1_STRING *seq = NULL;
 921         unsigned char *p, *pp = NULL;
 922         int len;
 923 
 924         len = i2d_ESS_SIGNING_CERT(sc, NULL);
 925         if (!(pp = (unsigned char *) OPENSSL_malloc(len)))
 926                 {
 927                 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 928                 goto err;
 929                 }
 930         p = pp;
 931         i2d_ESS_SIGNING_CERT(sc, &p);
 932         if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
 933                 {
 934                 TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
 935                 goto err;
 936                 }
 937         OPENSSL_free(pp); pp = NULL;
 938         return PKCS7_add_signed_attribute(si,
 939                                           NID_id_smime_aa_signingCertificate,
 940                                           V_ASN1_SEQUENCE, seq);
 941  err:
 942         ASN1_STRING_free(seq);
 943         OPENSSL_free(pp);
 944 
 945         return 0;
 946         }
 947 
 948 
 949 static ASN1_GENERALIZEDTIME *
 950 TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time,
 951                                    long sec, long usec, unsigned precision)
 952         {
 953         time_t time_sec = (time_t) sec;
 954         struct tm *tm = NULL;
 955         char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
 956         char *p = genTime_str;
 957         char *p_end = genTime_str + sizeof(genTime_str);
 958 
 959         if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
 960                 goto err;
 961 
 962 
 963         if (!(tm = gmtime(&time_sec)))
 964                 goto err;
 965 
 966         /*
 967          * Put "genTime_str" in GeneralizedTime format.  We work around the
 968          * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST
 969          * NOT include fractional seconds") and OpenSSL related functions to
 970          * meet the rfc3161 requirement: "GeneralizedTime syntax can include
 971          * fraction-of-second details".
 972          */
 973         p += BIO_snprintf(p, p_end - p,
 974                           "%04d%02d%02d%02d%02d%02d",
 975                           tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday,
 976                           tm->tm_hour, tm->tm_min, tm->tm_sec);
 977         if (precision > 0)
 978         {
 979                 /* Add fraction of seconds (leave space for dot and null). */
 980                 BIO_snprintf(p, 2 + precision, ".%ld", usec);
 981                 /* We cannot use the snprintf return value,
 982                    because it might have been truncated. */
 983                 p += strlen(p);
 984 
 985                 /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides
 986                    the following restrictions for a DER-encoding, which OpenSSL
 987                    (specifically ASN1_GENERALIZEDTIME_check() function) doesn't
 988                    support:
 989                    "The encoding MUST terminate with a "Z" (which means "Zulu"
 990                    time). The decimal point element, if present, MUST be the
 991                    point option ".". The fractional-seconds elements,
 992                    if present, MUST omit all trailing 0's;
 993                    if the elements correspond to 0, they MUST be wholly
 994                    omitted, and the decimal point element also MUST be
 995                    omitted." */
 996                 /* Remove trailing zeros. The dot guarantees the exit
 997                    condition of this loop even if all the digits are zero. */
 998                 while (*--p == '0')
 999                         /* empty */;
1000                 /* p points to either the dot or the last non-zero digit. */
1001                 if (*p != '.') ++p;
1002                 }
1003         /* Add the trailing Z and the terminating null. */
1004         *p++ = 'Z';
1005         *p++ = '\0';
1006 
1007         /* Now call OpenSSL to check and set our genTime value */
1008         if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new()))
1009                 goto err;
1010         if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str))
1011                 {
1012                 ASN1_GENERALIZEDTIME_free(asn1_time);
1013                 goto err;
1014                 }
1015 
1016         return asn1_time;
1017  err:
1018         TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
1019         return NULL;
1020         }