crypto/ct/ct_policy.c

   1 /*
   2  * Copyright 2016 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 #ifdef OPENSSL_NO_CT
  11 # error "CT is disabled"
  12 #endif
  13
  14 #include <openssl/ct.h>
  15 #include <openssl/err.h>
  16 #include <time.h>
  17
  18 #include "ct_local.h"
  19
  20 /*
  21  * Number of seconds in the future that an SCT timestamp can be, by default,
  22  * without being considered invalid. This is added to time() when setting a
  23  * default value for CT_POLICY_EVAL_CTX.epoch_time_in_ms.
  24  * It can be overridden by calling CT_POLICY_EVAL_CTX_set_time().
  25  */
  26 static const time_t SCT_CLOCK_DRIFT_TOLERANCE = 300;
  27
  28 CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void)
  29 {
  30     CT_POLICY_EVAL_CTX *ctx = OPENSSL_zalloc(sizeof(CT_POLICY_EVAL_CTX));
  31
  32     if (ctx == NULL) {
  33         CTerr(CT_F_CT_POLICY_EVAL_CTX_NEW, ERR_R_MALLOC_FAILURE);
  34         return NULL;
  35     }
  36
  37     /* time(NULL) shouldn't ever fail, so don't bother checking for -1. */
  38     ctx->epoch_time_in_ms = (uint64_t)(time(NULL) + SCT_CLOCK_DRIFT_TOLERANCE) *
  39             1000;
  40
  41     return ctx;
  42 }
  43
  44 void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx)
  45 {
  46     if (ctx == NULL)
  47         return;
  48     X509_free(ctx->cert);
  49     X509_free(ctx->issuer);
  50     OPENSSL_free(ctx);
  51 }
  52
  53 int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert)
  54 {
  55     if (!X509_up_ref(cert))
  56         return 0;
  57     ctx->cert = cert;
  58     return 1;
  59 }
  60
  61 int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer)
  62 {
  63     if (!X509_up_ref(issuer))
  64         return 0;
  65     ctx->issuer = issuer;
  66     return 1;
  67 }
  68
  69 void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
  70                                                CTLOG_STORE *log_store)
  71 {
  72     ctx->log_store = log_store;
  73 }
  74
  75 void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms)
  76 {
  77     ctx->epoch_time_in_ms = time_in_ms;
  78 }
  79
  80 X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx)
  81 {
  82     return ctx->cert;
  83 }
  84
  85 X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx)
  86 {
  87     return ctx->issuer;
  88 }
  89
  90 const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx)
  91 {
  92     return ctx->log_store;
  93 }
  94
  95 uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx)
  96 {
  97     return ctx->epoch_time_in_ms;
  98 }