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ts_rsp_sign.c

/* crypto/ts/ts_resp_sign.c */
/* Written by Zoltan Glozik (zglozik@stones.com) for the OpenSSL
 * project 2002.
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include "cryptlib.h"

#if defined(OPENSSL_SYS_UNIX)
#include <sys/time.h>
#endif

#include <openssl/objects.h>
#include <openssl/ts.h>
#include <openssl/pkcs7.h>

/* Private function declarations. */

static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *, void *);
static int def_time_cb(struct TS_resp_ctx *, void *, long *sec, long *usec);
static int def_extension_cb(struct TS_resp_ctx *, X509_EXTENSION *, void *);

static void TS_RESP_CTX_init(TS_RESP_CTX *ctx);
static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx);
static int TS_RESP_check_request(TS_RESP_CTX *ctx);
static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx);
static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx, 
                                  ASN1_OBJECT *policy);
static int TS_RESP_process_extensions(TS_RESP_CTX *ctx);
static int TS_RESP_sign(TS_RESP_CTX *ctx);

static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 
                                       STACK_OF(X509) *certs);
static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
static int TS_TST_INFO_content_new(PKCS7 *p7);
static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc);

static ASN1_GENERALIZEDTIME *TS_RESP_set_genTime_with_precision(
      ASN1_GENERALIZEDTIME *, long, long, unsigned);

/* Default callbacks for response generation. */

static ASN1_INTEGER *def_serial_cb(struct TS_resp_ctx *ctx, void *data)
      {
      ASN1_INTEGER *serial = ASN1_INTEGER_new();
      if (!serial) goto err;
      if (!ASN1_INTEGER_set(serial, 1)) goto err;
      return serial;
 err:
      TSerr(TS_F_DEF_SERIAL_CB, ERR_R_MALLOC_FAILURE);
      TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                            "Error during serial number generation.");
      return NULL;
      }

#if defined(OPENSSL_SYS_UNIX)

/* Use the gettimeofday function call. */
static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 
                   long *sec, long *usec)
      {
      struct timeval tv;
      if (gettimeofday(&tv, NULL) != 0) 
            {
            TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Time is not available.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
            return 0;
            }
      /* Return time to caller. */
      *sec = tv.tv_sec;
      *usec = tv.tv_usec;

      return 1;
      }

#else

/* Use the time function call that provides only seconds precision. */
static int def_time_cb(struct TS_resp_ctx *ctx, void *data, 
                   long *sec, long *usec)
      {
      time_t t;
      if (time(&t) == (time_t) -1)
            {
            TSerr(TS_F_DEF_TIME_CB, TS_R_TIME_SYSCALL_ERROR);
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Time is not available.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_TIME_NOT_AVAILABLE);
            return 0;
            }
      /* Return time to caller, only second precision. */
      *sec = (long) t;
      *usec = 0;

      return 1;
      }

#endif

static int def_extension_cb(struct TS_resp_ctx *ctx, X509_EXTENSION *ext,
                      void *data)
      {
      /* No extensions are processed here. */
      TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                            "Unsupported extension.");
      TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_EXTENSION);
      return 0;
      }

/* TS_RESP_CTX management functions. */

TS_RESP_CTX *TS_RESP_CTX_new()
      {
      TS_RESP_CTX *ctx;

      if (!(ctx = (TS_RESP_CTX *) OPENSSL_malloc(sizeof(TS_RESP_CTX))))
            {
            TSerr(TS_F_TS_RESP_CTX_NEW, ERR_R_MALLOC_FAILURE);
            return NULL;
            }
      memset(ctx, 0, sizeof(TS_RESP_CTX));

      /* Setting default callbacks. */
      ctx->serial_cb = def_serial_cb;
      ctx->time_cb = def_time_cb;
      ctx->extension_cb = def_extension_cb;

      return ctx;
      }

void TS_RESP_CTX_free(TS_RESP_CTX *ctx)
      {
      if (!ctx) return;

      X509_free(ctx->signer_cert);
      EVP_PKEY_free(ctx->signer_key);
      sk_X509_pop_free(ctx->certs, X509_free);
      sk_ASN1_OBJECT_pop_free(ctx->policies, ASN1_OBJECT_free);
      ASN1_OBJECT_free(ctx->default_policy);
      sk_EVP_MD_free(ctx->mds);     /* No EVP_MD_free method exists. */
      ASN1_INTEGER_free(ctx->seconds);
      ASN1_INTEGER_free(ctx->millis);
      ASN1_INTEGER_free(ctx->micros);
      OPENSSL_free(ctx);
      }

int TS_RESP_CTX_set_signer_cert(TS_RESP_CTX *ctx, X509 *signer)
      {
      if (X509_check_purpose(signer, X509_PURPOSE_TIMESTAMP_SIGN, 0) != 1)
            {
            TSerr(TS_F_TS_RESP_CTX_SET_SIGNER_CERT, 
                  TS_R_INVALID_SIGNER_CERTIFICATE_PURPOSE);
            return 0;
            }
      if (ctx->signer_cert) X509_free(ctx->signer_cert);
      ctx->signer_cert = signer;
      CRYPTO_add(&ctx->signer_cert->references, +1, CRYPTO_LOCK_X509);
      return 1;
      }

int TS_RESP_CTX_set_signer_key(TS_RESP_CTX *ctx, EVP_PKEY *key)
      {
      if (ctx->signer_key) EVP_PKEY_free(ctx->signer_key);
      ctx->signer_key = key;
      CRYPTO_add(&ctx->signer_key->references, +1, CRYPTO_LOCK_EVP_PKEY);

      return 1;
      }

int TS_RESP_CTX_set_def_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *def_policy)
      {
      if (ctx->default_policy) ASN1_OBJECT_free(ctx->default_policy);
      if (!(ctx->default_policy = OBJ_dup(def_policy))) goto err;
      return 1;
 err:
      TSerr(TS_F_TS_RESP_CTX_SET_DEF_POLICY, ERR_R_MALLOC_FAILURE);
      return 0;
      }

int TS_RESP_CTX_set_certs(TS_RESP_CTX *ctx, STACK_OF(X509) *certs)
      {
      int i;

      if (ctx->certs)
            {
            sk_X509_pop_free(ctx->certs, X509_free);
            ctx->certs = NULL;
            }
      if (!certs) return 1;
      if (!(ctx->certs = sk_X509_dup(certs))) 
            {
            TSerr(TS_F_TS_RESP_CTX_SET_CERTS, ERR_R_MALLOC_FAILURE);
            return 0;
            }
      for (i = 0; i < sk_X509_num(ctx->certs); ++i)
            {
            X509 *cert = sk_X509_value(ctx->certs, i);
            CRYPTO_add(&cert->references, +1, CRYPTO_LOCK_X509);
            }

      return 1;
      }

int TS_RESP_CTX_add_policy(TS_RESP_CTX *ctx, ASN1_OBJECT *policy)
      {
      ASN1_OBJECT *copy = NULL;

      /* Create new policy stack if necessary. */
      if (!ctx->policies && !(ctx->policies = sk_ASN1_OBJECT_new_null())) 
            goto err;
      if (!(copy = OBJ_dup(policy))) goto err;
      if (!sk_ASN1_OBJECT_push(ctx->policies, copy)) goto err;

      return 1;
 err:
      TSerr(TS_F_TS_RESP_CTX_ADD_POLICY, ERR_R_MALLOC_FAILURE);
      ASN1_OBJECT_free(copy);
      return 0;
      }

int TS_RESP_CTX_add_md(TS_RESP_CTX *ctx, const EVP_MD *md)
      {
      /* Create new md stack if necessary. */
      if (!ctx->mds && !(ctx->mds = sk_EVP_MD_new_null())) 
            goto err;
      /* Add the shared md, no copy needed. */
      if (!sk_EVP_MD_push(ctx->mds, (EVP_MD *)md)) goto err;

      return 1;
 err:
      TSerr(TS_F_TS_RESP_CTX_ADD_MD, ERR_R_MALLOC_FAILURE);
      return 0;
      }

#define TS_RESP_CTX_accuracy_free(ctx)          \
      ASN1_INTEGER_free(ctx->seconds);    \
      ctx->seconds = NULL;                \
      ASN1_INTEGER_free(ctx->millis);           \
      ctx->millis = NULL;                 \
      ASN1_INTEGER_free(ctx->micros);           \
      ctx->micros = NULL;

int TS_RESP_CTX_set_accuracy(TS_RESP_CTX *ctx, 
                       int secs, int millis, int micros)
      {

      TS_RESP_CTX_accuracy_free(ctx);
      if (secs && (!(ctx->seconds = ASN1_INTEGER_new())
                 || !ASN1_INTEGER_set(ctx->seconds, secs)))
            goto err;
      if (millis && (!(ctx->millis = ASN1_INTEGER_new())
                   || !ASN1_INTEGER_set(ctx->millis, millis)))
            goto err;
      if (micros && (!(ctx->micros = ASN1_INTEGER_new())
                   || !ASN1_INTEGER_set(ctx->micros, micros)))
            goto err;

      return 1;
 err:
      TS_RESP_CTX_accuracy_free(ctx);
      TSerr(TS_F_TS_RESP_CTX_SET_ACCURACY, ERR_R_MALLOC_FAILURE);
      return 0;
      }

void TS_RESP_CTX_add_flags(TS_RESP_CTX *ctx, int flags)
      {
      ctx->flags |= flags;
      }

void TS_RESP_CTX_set_serial_cb(TS_RESP_CTX *ctx, TS_serial_cb cb, void *data)
      {
      ctx->serial_cb = cb;
      ctx->serial_cb_data = data;
      }

void TS_RESP_CTX_set_time_cb(TS_RESP_CTX *ctx, TS_time_cb cb, void *data)
      {
      ctx->time_cb = cb;
      ctx->time_cb_data = data;
      }

void TS_RESP_CTX_set_extension_cb(TS_RESP_CTX *ctx, 
                          TS_extension_cb cb, void *data)
      {
      ctx->extension_cb = cb;
      ctx->extension_cb_data = data;
      }

int TS_RESP_CTX_set_status_info(TS_RESP_CTX *ctx, 
                        int status, const char *text)
      {
      TS_STATUS_INFO *si = NULL;
      ASN1_UTF8STRING *utf8_text = NULL;
      int ret = 0;

      if (!(si = TS_STATUS_INFO_new())) goto err;
      if (!ASN1_INTEGER_set(si->status, status)) goto err;
      if (text)
            {
            if (!(utf8_text = ASN1_UTF8STRING_new())
                || !ASN1_STRING_set(utf8_text, text, strlen(text)))
                  goto err;
            if (!si->text && !(si->text = sk_ASN1_UTF8STRING_new_null()))
                  goto err;
            if (!sk_ASN1_UTF8STRING_push(si->text, utf8_text)) goto err;
            utf8_text = NULL; /* Ownership is lost. */
            }
      if (!TS_RESP_set_status_info(ctx->response, si)) goto err;
      ret = 1;
 err:
      if (!ret)
            TSerr(TS_F_TS_RESP_CTX_SET_STATUS_INFO, ERR_R_MALLOC_FAILURE);
      TS_STATUS_INFO_free(si);
      ASN1_UTF8STRING_free(utf8_text);
      return ret;
      }

int TS_RESP_CTX_set_status_info_cond(TS_RESP_CTX *ctx, 
                             int status, const char *text)
      {
      int ret = 1;
      TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);

      if (ASN1_INTEGER_get(si->status) == TS_STATUS_GRANTED)
            {
            /* Status has not been set, set it now. */
            ret = TS_RESP_CTX_set_status_info(ctx, status, text);
            }
      return ret;
      }

int TS_RESP_CTX_add_failure_info(TS_RESP_CTX *ctx, int failure)
      {
      TS_STATUS_INFO *si = TS_RESP_get_status_info(ctx->response);
      if (!si->failure_info && !(si->failure_info = ASN1_BIT_STRING_new()))
            goto err;
      if (!ASN1_BIT_STRING_set_bit(si->failure_info, failure, 1))
            goto err;
      return 1;
 err:
      TSerr(TS_F_TS_RESP_CTX_ADD_FAILURE_INFO, ERR_R_MALLOC_FAILURE);
      return 0;
      }

TS_REQ *TS_RESP_CTX_get_request(TS_RESP_CTX *ctx)
      {
      return ctx->request;
      }

TS_TST_INFO *TS_RESP_CTX_get_tst_info(TS_RESP_CTX *ctx)
      {
      return ctx->tst_info;
      }

int TS_RESP_CTX_set_clock_precision_digits(TS_RESP_CTX *ctx, unsigned precision)
       {
       if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
             return 0;
       ctx->clock_precision_digits = precision;
       return 1;
       }

/* Main entry method of the response generation. */
TS_RESP *TS_RESP_create_response(TS_RESP_CTX *ctx, BIO *req_bio)
      {
      ASN1_OBJECT *policy;
      TS_RESP *response;
      int result = 0;

      TS_RESP_CTX_init(ctx);

      /* Creating the response object. */
      if (!(ctx->response = TS_RESP_new())) 
            {
            TSerr(TS_F_TS_RESP_CREATE_RESPONSE, ERR_R_MALLOC_FAILURE);
            goto end;
            }

      /* Parsing DER request. */
      if (!(ctx->request = d2i_TS_REQ_bio(req_bio, NULL)))
            {
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Bad request format or "
                                  "system error.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
            goto end;
            }

      /* Setting default status info. */
      if (!TS_RESP_CTX_set_status_info(ctx, TS_STATUS_GRANTED, NULL))
            goto end;

      /* Checking the request format. */
      if (!TS_RESP_check_request(ctx)) goto end;

      /* Checking acceptable policies. */
      if (!(policy = TS_RESP_get_policy(ctx))) goto end;

      /* Creating the TS_TST_INFO object. */
      if (!(ctx->tst_info = TS_RESP_create_tst_info(ctx, policy)))
            goto end;

      /* Processing extensions. */
      if (!TS_RESP_process_extensions(ctx)) goto end;

      /* Generating the signature. */
      if (!TS_RESP_sign(ctx)) goto end;

      /* Everything was successful. */
      result = 1;
 end:
      if (!result)
            {
            TSerr(TS_F_TS_RESP_CREATE_RESPONSE, TS_R_RESPONSE_SETUP_ERROR);
            if (ctx->response != NULL)
                  {
                  if (TS_RESP_CTX_set_status_info_cond(ctx,
                        TS_STATUS_REJECTION, "Error during response "
                        "generation.") == 0)
                        {
                        TS_RESP_free(ctx->response);
                        ctx->response = NULL;
                        }
                  }
            }
      response = ctx->response;
      ctx->response = NULL;   /* Ownership will be returned to caller. */
      TS_RESP_CTX_cleanup(ctx);
      return response;
      }

/* Initializes the variable part of the context. */
static void TS_RESP_CTX_init(TS_RESP_CTX *ctx)
      {
      ctx->request = NULL;
      ctx->response = NULL;
      ctx->tst_info = NULL;
      }

/* Cleans up the variable part of the context. */
static void TS_RESP_CTX_cleanup(TS_RESP_CTX *ctx)
      {
      TS_REQ_free(ctx->request);
      ctx->request = NULL;
      TS_RESP_free(ctx->response);
      ctx->response = NULL;
      TS_TST_INFO_free(ctx->tst_info);
      ctx->tst_info = NULL;
      }

/* Checks the format and content of the request. */
static int TS_RESP_check_request(TS_RESP_CTX *ctx)
      {
      TS_REQ *request = ctx->request;
      TS_MSG_IMPRINT *msg_imprint;
      X509_ALGOR *md_alg;
      int md_alg_id;
      const ASN1_OCTET_STRING *digest;
      EVP_MD *md = NULL;
      int i;

      /* Checking request version. */
      if (TS_REQ_get_version(request) != 1)
            {
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Bad request version.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_REQUEST);
            return 0;
            }

      /* Checking message digest algorithm. */
      msg_imprint = TS_REQ_get_msg_imprint(request);
      md_alg = TS_MSG_IMPRINT_get_algo(msg_imprint);
      md_alg_id = OBJ_obj2nid(md_alg->algorithm);
      for (i = 0; !md && i < sk_EVP_MD_num(ctx->mds); ++i)
            {
            EVP_MD *current_md = sk_EVP_MD_value(ctx->mds, i);
            if (md_alg_id == EVP_MD_type(current_md))
                  md = current_md;
            }
      if (!md)
            {
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Message digest algorithm is "
                                  "not supported.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
            return 0;
            }

      /* No message digest takes parameter. */
      if (md_alg->parameter 
          && ASN1_TYPE_get(md_alg->parameter) != V_ASN1_NULL)
            {
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Superfluous message digest "
                                  "parameter.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_ALG);
            return 0;
            }
      /* Checking message digest size. */
      digest = TS_MSG_IMPRINT_get_msg(msg_imprint);
      if (digest->length != EVP_MD_size(md))
            {
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Bad message digest.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_BAD_DATA_FORMAT);
            return 0;
            }

      return 1;
      }

/* Returns the TSA policy based on the requested and acceptable policies. */
static ASN1_OBJECT *TS_RESP_get_policy(TS_RESP_CTX *ctx)
      {
      ASN1_OBJECT *requested = TS_REQ_get_policy_id(ctx->request);
      ASN1_OBJECT *policy = NULL;
      int i;

      if (ctx->default_policy == NULL)
            {
            TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_INVALID_NULL_POINTER);
            return NULL;
            }
      /* Return the default policy if none is requested or the default is
         requested. */
      if (!requested || !OBJ_cmp(requested, ctx->default_policy))
            policy = ctx->default_policy;

      /* Check if the policy is acceptable. */
      for (i = 0; !policy && i < sk_ASN1_OBJECT_num(ctx->policies); ++i)
            {
            ASN1_OBJECT *current = sk_ASN1_OBJECT_value(ctx->policies, i);
            if (!OBJ_cmp(requested, current))
                  policy = current;
            }
      if (!policy)
            {
            TSerr(TS_F_TS_RESP_GET_POLICY, TS_R_UNACCEPTABLE_POLICY);
            TS_RESP_CTX_set_status_info(ctx, TS_STATUS_REJECTION,
                                  "Requested policy is not "
                                  "supported.");
            TS_RESP_CTX_add_failure_info(ctx, TS_INFO_UNACCEPTED_POLICY);
            }
      return policy;
      }

/* Creates the TS_TST_INFO object based on the settings of the context. */
static TS_TST_INFO *TS_RESP_create_tst_info(TS_RESP_CTX *ctx,
                                  ASN1_OBJECT *policy)
      {
      int result = 0;
      TS_TST_INFO *tst_info = NULL;
      ASN1_INTEGER *serial = NULL;
      ASN1_GENERALIZEDTIME *asn1_time = NULL;
      long sec, usec;
      TS_ACCURACY *accuracy = NULL;
      const ASN1_INTEGER *nonce;
      GENERAL_NAME *tsa_name = NULL;

      if (!(tst_info = TS_TST_INFO_new())) goto end;
      if (!TS_TST_INFO_set_version(tst_info, 1)) goto end;
      if (!TS_TST_INFO_set_policy_id(tst_info, policy)) goto end;
      if (!TS_TST_INFO_set_msg_imprint(tst_info, ctx->request->msg_imprint))
            goto end;
      if (!(serial = (*ctx->serial_cb)(ctx, ctx->serial_cb_data))
          || !TS_TST_INFO_set_serial(tst_info, serial))
            goto end;
      if (!(*ctx->time_cb)(ctx, ctx->time_cb_data, &sec, &usec)
            || !(asn1_time = TS_RESP_set_genTime_with_precision(NULL, 
                              sec, usec, 
                              ctx->clock_precision_digits))
          || !TS_TST_INFO_set_time(tst_info, asn1_time))
            goto end;

      /* Setting accuracy if needed. */
      if ((ctx->seconds || ctx->millis || ctx->micros) 
          && !(accuracy = TS_ACCURACY_new()))
            goto end;

      if (ctx->seconds && !TS_ACCURACY_set_seconds(accuracy, ctx->seconds))
            goto end;
      if (ctx->millis && !TS_ACCURACY_set_millis(accuracy, ctx->millis))
            goto end;
      if (ctx->micros && !TS_ACCURACY_set_micros(accuracy, ctx->micros))
            goto end;
      if (accuracy && !TS_TST_INFO_set_accuracy(tst_info, accuracy)) 
            goto end;

      /* Setting ordering. */
      if ((ctx->flags & TS_ORDERING) 
          && !TS_TST_INFO_set_ordering(tst_info, 1))
            goto end;
      
      /* Setting nonce if needed. */
      if ((nonce = TS_REQ_get_nonce(ctx->request)) != NULL
          && !TS_TST_INFO_set_nonce(tst_info, nonce))
            goto end;

      /* Setting TSA name to subject of signer certificate. */
      if (ctx->flags & TS_TSA_NAME)
            {
            if (!(tsa_name = GENERAL_NAME_new())) goto end;
            tsa_name->type = GEN_DIRNAME;
            tsa_name->d.dirn = 
                  X509_NAME_dup(ctx->signer_cert->cert_info->subject);
            if (!tsa_name->d.dirn) goto end;
            if (!TS_TST_INFO_set_tsa(tst_info, tsa_name)) goto end;
            }

      result = 1;
 end:
      if (!result)
            {
            TS_TST_INFO_free(tst_info);
            tst_info = NULL;
            TSerr(TS_F_TS_RESP_CREATE_TST_INFO, TS_R_TST_INFO_SETUP_ERROR);
            TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
                                     "Error during TSTInfo "
                                     "generation.");
            }
      GENERAL_NAME_free(tsa_name);
      TS_ACCURACY_free(accuracy);
      ASN1_GENERALIZEDTIME_free(asn1_time);
      ASN1_INTEGER_free(serial);
      
      return tst_info;
      }

/* Processing the extensions of the request. */
static int TS_RESP_process_extensions(TS_RESP_CTX *ctx)
      {
      STACK_OF(X509_EXTENSION) *exts = TS_REQ_get_exts(ctx->request);
      int i;
      int ok = 1;

      for (i = 0; ok && i < sk_X509_EXTENSION_num(exts); ++i)
            {
            X509_EXTENSION *ext = sk_X509_EXTENSION_value(exts, i);
            /* XXXXX The last argument was previously
               (void *)ctx->extension_cb, but ISO C doesn't permit
               converting a function pointer to void *.  For lack of
               better information, I'm placing a NULL there instead.
               The callback can pick its own address out from the ctx
               anyway...
            */
            ok = (*ctx->extension_cb)(ctx, ext, NULL);
            }

      return ok;
      }

/* Functions for signing the TS_TST_INFO structure of the context. */
static int TS_RESP_sign(TS_RESP_CTX *ctx)
      {
      int ret = 0;
      PKCS7 *p7 = NULL;
      PKCS7_SIGNER_INFO *si;
      STACK_OF(X509) *certs;  /* Certificates to include in sc. */
      ESS_SIGNING_CERT *sc = NULL;
      ASN1_OBJECT *oid;
      BIO *p7bio = NULL;
      int i;

      /* Check if signcert and pkey match. */
      if (!X509_check_private_key(ctx->signer_cert, ctx->signer_key)) {
            TSerr(TS_F_TS_RESP_SIGN, 
                  TS_R_PRIVATE_KEY_DOES_NOT_MATCH_CERTIFICATE);
                goto err;
      }

      /* Create a new PKCS7 signed object. */
      if (!(p7 = PKCS7_new())) {
            TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
            goto err;
      }
      if (!PKCS7_set_type(p7, NID_pkcs7_signed)) goto err;

      /* Force SignedData version to be 3 instead of the default 1. */
      if (!ASN1_INTEGER_set(p7->d.sign->version, 3)) goto err;

      /* Add signer certificate and optional certificate chain. */
      if (TS_REQ_get_cert_req(ctx->request))
            {
            PKCS7_add_certificate(p7, ctx->signer_cert);
            if (ctx->certs)
                  {
                  for(i = 0; i < sk_X509_num(ctx->certs); ++i) 
                        {
                        X509 *cert = sk_X509_value(ctx->certs, i);
                        PKCS7_add_certificate(p7, cert);
                        }
                  }
            }

      /* Add a new signer info. */
      if (!(si = PKCS7_add_signature(p7, ctx->signer_cert, 
                               ctx->signer_key, EVP_sha1())))
            {
            TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNATURE_ERROR);
            goto err;
            }

      /* Add content type signed attribute to the signer info. */
      oid = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
      if (!PKCS7_add_signed_attribute(si, NID_pkcs9_contentType,
                              V_ASN1_OBJECT, oid))
            {
            TSerr(TS_F_TS_RESP_SIGN, TS_R_PKCS7_ADD_SIGNED_ATTR_ERROR);
            goto err;
            }

      /* Create the ESS SigningCertificate attribute which contains 
         the signer certificate id and optionally the certificate chain. */
      certs = ctx->flags & TS_ESS_CERT_ID_CHAIN ? ctx->certs : NULL;
      if (!(sc = ESS_SIGNING_CERT_new_init(ctx->signer_cert, certs)))
            goto err;

      /* Add SigningCertificate signed attribute to the signer info. */
      if (!ESS_add_signing_cert(si, sc))
            {
            TSerr(TS_F_TS_RESP_SIGN, TS_R_ESS_ADD_SIGNING_CERT_ERROR);
            goto err;
            }     

      /* Add a new empty NID_id_smime_ct_TSTInfo encapsulated content. */
      if (!TS_TST_INFO_content_new(p7)) goto err;

      /* Add the DER encoded tst_info to the PKCS7 structure. */
      if (!(p7bio = PKCS7_dataInit(p7, NULL))) {
            TSerr(TS_F_TS_RESP_SIGN, ERR_R_MALLOC_FAILURE);
            goto err;
      }

      /* Convert tst_info to DER. */
      if (!i2d_TS_TST_INFO_bio(p7bio, ctx->tst_info))
            {
            TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
            goto err;
            }

      /* Create the signature and add it to the signer info. */
        if (!PKCS7_dataFinal(p7, p7bio))
            {
            TSerr(TS_F_TS_RESP_SIGN, TS_R_TS_DATASIGN);
            goto err;
            }

      /* Set new PKCS7 and TST_INFO objects. */
      TS_RESP_set_tst_info(ctx->response, p7, ctx->tst_info);
      p7 = NULL;        /* Ownership is lost. */
      ctx->tst_info = NULL;   /* Ownership is lost. */

      ret = 1;
 err:
      if (!ret)
            TS_RESP_CTX_set_status_info_cond(ctx, TS_STATUS_REJECTION,
                                     "Error during signature "
                                     "generation.");
      BIO_free_all(p7bio);
      ESS_SIGNING_CERT_free(sc);
      PKCS7_free(p7);
      return ret;
      }

static ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert, 
                                       STACK_OF(X509) *certs)
      {
      ESS_CERT_ID *cid;
      ESS_SIGNING_CERT *sc = NULL;
      int i;

      /* Creating the ESS_CERT_ID stack. */
      if (!(sc = ESS_SIGNING_CERT_new())) goto err;
      if (!sc->cert_ids && !(sc->cert_ids = sk_ESS_CERT_ID_new_null()))
            goto err;

      /* Adding the signing certificate id. */
      if (!(cid = ESS_CERT_ID_new_init(signcert, 0))
          || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
            goto err;
      /* Adding the certificate chain ids. */
      for (i = 0; i < sk_X509_num(certs); ++i)
            {
            X509 *cert = sk_X509_value(certs, i);
            if (!(cid = ESS_CERT_ID_new_init(cert, 1))
                || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
                  goto err;
            }

      return sc;
err:
      ESS_SIGNING_CERT_free(sc);
      TSerr(TS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
      return NULL;
      }

static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
      {
      ESS_CERT_ID *cid = NULL;
      GENERAL_NAME *name = NULL;
      
      /* Recompute SHA1 hash of certificate if necessary (side effect). */
      X509_check_purpose(cert, -1, 0);

      if (!(cid = ESS_CERT_ID_new())) goto err;
      if (!ASN1_OCTET_STRING_set(cid->hash, cert->sha1_hash,
                           sizeof(cert->sha1_hash)))
            goto err;

      /* Setting the issuer/serial if requested. */
      if (issuer_needed)
            {
            /* Creating issuer/serial structure. */
            if (!cid->issuer_serial
                && !(cid->issuer_serial = ESS_ISSUER_SERIAL_new()))
                  goto err;
            /* Creating general name from the certificate issuer. */
            if (!(name = GENERAL_NAME_new())) goto err;
            name->type = GEN_DIRNAME;
            if (!(name->d.dirn = X509_NAME_dup(cert->cert_info->issuer))) 
                  goto err;
            if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name)) 
                  goto err;
            name = NULL;      /* Ownership is lost. */
            /* Setting the serial number. */
            ASN1_INTEGER_free(cid->issuer_serial->serial);
            if (!(cid->issuer_serial->serial = 
                  ASN1_INTEGER_dup(cert->cert_info->serialNumber)))
                  goto err;
            }

      return cid;
err:
      GENERAL_NAME_free(name);
      ESS_CERT_ID_free(cid);
      TSerr(TS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
      return NULL;
      }

static int TS_TST_INFO_content_new(PKCS7 *p7)
      {
      PKCS7 *ret = NULL;
      ASN1_OCTET_STRING *octet_string = NULL;

      /* Create new encapsulated NID_id_smime_ct_TSTInfo content. */
      if (!(ret = PKCS7_new())) goto err;
      if (!(ret->d.other = ASN1_TYPE_new())) goto err;
      ret->type = OBJ_nid2obj(NID_id_smime_ct_TSTInfo);
      if (!(octet_string = ASN1_OCTET_STRING_new())) goto err;
      ASN1_TYPE_set(ret->d.other, V_ASN1_OCTET_STRING, octet_string);
      octet_string = NULL;

      /* Add encapsulated content to signed PKCS7 structure. */
      if (!PKCS7_set_content(p7, ret)) goto err;

      return 1;
 err:
      ASN1_OCTET_STRING_free(octet_string);
      PKCS7_free(ret);
      return 0;
      }

static int ESS_add_signing_cert(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
      {
      ASN1_STRING *seq = NULL;
      unsigned char *p, *pp = NULL;
      int len;

      len = i2d_ESS_SIGNING_CERT(sc, NULL);
      if (!(pp = (unsigned char *) OPENSSL_malloc(len)))
            {
            TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
            goto err;
            }
      p = pp;
      i2d_ESS_SIGNING_CERT(sc, &p);
      if (!(seq = ASN1_STRING_new()) || !ASN1_STRING_set(seq, pp, len))
            {
            TSerr(TS_F_ESS_ADD_SIGNING_CERT, ERR_R_MALLOC_FAILURE);
            goto err;
            }
      OPENSSL_free(pp); pp = NULL;
      return PKCS7_add_signed_attribute(si, 
                                NID_id_smime_aa_signingCertificate,
                                V_ASN1_SEQUENCE, seq);
 err:
      ASN1_STRING_free(seq);
      OPENSSL_free(pp);

      return 0;
      }


static ASN1_GENERALIZEDTIME *
TS_RESP_set_genTime_with_precision(ASN1_GENERALIZEDTIME *asn1_time, 
                           long sec, long usec, unsigned precision)
      {
      time_t time_sec = (time_t) sec;
      struct tm *tm = NULL;   
      char genTime_str[17 + TS_MAX_CLOCK_PRECISION_DIGITS];
      char *p = genTime_str;
      char *p_end = genTime_str + sizeof(genTime_str);

      if (precision > TS_MAX_CLOCK_PRECISION_DIGITS)
            goto err;

      
      if (!(tm = gmtime(&time_sec)))
            goto err;

      /* 
       * Put "genTime_str" in GeneralizedTime format.  We work around the 
       * restrictions imposed by rfc3280 (i.e. "GeneralizedTime values MUST 
       * NOT include fractional seconds") and OpenSSL related functions to 
       * meet the rfc3161 requirement: "GeneralizedTime syntax can include 
       * fraction-of-second details". 
       */                   
      p += BIO_snprintf(p, p_end - p,
                    "%04d%02d%02d%02d%02d%02d",
                    tm->tm_year + 1900, tm->tm_mon + 1, tm->tm_mday, 
                    tm->tm_hour, tm->tm_min, tm->tm_sec);
      if (precision > 0)
      {
            /* Add fraction of seconds (leave space for dot and null). */
            BIO_snprintf(p, 2 + precision, ".%ld", usec);
            /* We cannot use the snprintf return value, 
               because it might have been truncated. */
            p += strlen(p);

            /* To make things a bit harder, X.690 | ISO/IEC 8825-1 provides
               the following restrictions for a DER-encoding, which OpenSSL
               (specifically ASN1_GENERALIZEDTIME_check() function) doesn't 
               support:
               "The encoding MUST terminate with a "Z" (which means "Zulu" 
               time). The decimal point element, if present, MUST be the 
               point option ".". The fractional-seconds elements, 
               if present, MUST omit all trailing 0's; 
               if the elements correspond to 0, they MUST be wholly
               omitted, and the decimal point element also MUST be
               omitted." */
            /* Remove trailing zeros. The dot guarantees the exit
               condition of this loop even if all the digits are zero. */
            while (*--p == '0')
                  /* empty */;
            /* p points to either the dot or the last non-zero digit. */
            if (*p != '.') ++p;
            }
      /* Add the trailing Z and the terminating null. */
      *p++ = 'Z';
      *p++ = '\0';

      /* Now call OpenSSL to check and set our genTime value */
      if (!asn1_time && !(asn1_time = M_ASN1_GENERALIZEDTIME_new()))
            goto err;
      if (!ASN1_GENERALIZEDTIME_set_string(asn1_time, genTime_str))
            {
            ASN1_GENERALIZEDTIME_free(asn1_time);
            goto err;
            }

      return asn1_time;
 err:
      TSerr(TS_F_TS_RESP_SET_GENTIME_WITH_PRECISION, TS_R_COULD_NOT_SET_TIME);
      return NULL;
      }

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