Exemple #1
0
SSL_SESSION *SSL_get1_session(SSL *ssl) {
  SSL_SESSION *ret = SSL_get_session(ssl);
  if (ret != NULL) {
    SSL_SESSION_up_ref(ret);
  }
  return ret;
}
Exemple #2
0
void SSLSessionImpl::upRef() {
  if (session_) {
#if defined(OPENSSL_IS_102) || defined(OPENSSL_IS_101)
    CRYPTO_add(&session_->references, 1, CRYPTO_LOCK_SSL_SESSION);
#elif defined(OPENSSL_IS_BORINGSSL) || defined(OPENSSL_IS_110)
    SSL_SESSION_up_ref(session_);
#endif
  }
}
Exemple #3
0
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c) {
  int ret = 0;
  SSL_SESSION *s;

  /* add just 1 reference count for the SSL_CTX's session cache even though it
   * has two ways of access: each session is in a doubly linked list and an
   * lhash */
  SSL_SESSION_up_ref(c);
  /* if session c is in already in cache, we take back the increment later */

  CRYPTO_MUTEX_lock_write(&ctx->lock);
  if (!lh_SSL_SESSION_insert(ctx->sessions, &s, c)) {
    CRYPTO_MUTEX_unlock(&ctx->lock);
    return 0;
  }

  /* s != NULL iff we already had a session with the given PID. In this case, s
   * == c should hold (then we did not really modify ctx->sessions), or we're
   * in trouble. */
  if (s != NULL && s != c) {
    /* We *are* in trouble ... */
    SSL_SESSION_list_remove(ctx, s);
    SSL_SESSION_free(s);
    /* ... so pretend the other session did not exist in cache (we cannot
     * handle two SSL_SESSION structures with identical session ID in the same
     * cache, which could happen e.g. when two threads concurrently obtain the
     * same session from an external cache) */
    s = NULL;
  }

  /* Put at the head of the queue unless it is already in the cache */
  if (s == NULL) {
    SSL_SESSION_list_add(ctx, c);
  }

  if (s != NULL) {
    /* existing cache entry -- decrement previously incremented reference count
     * because it already takes into account the cache */
    SSL_SESSION_free(s); /* s == c */
    ret = 0;
  } else {
    /* new cache entry -- remove old ones if cache has become too large */
    ret = 1;

    if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
      while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
        if (!remove_session_lock(ctx, ctx->session_cache_tail, 0)) {
          break;
        }
      }
    }
  }

  CRYPTO_MUTEX_unlock(&ctx->lock);
  return ret;
}
Exemple #4
0
void ssl_set_session(SSL *ssl, SSL_SESSION *session) {
  if (ssl->session == session) {
    return;
  }

  SSL_SESSION_free(ssl->session);
  ssl->session = session;
  if (session != NULL) {
    SSL_SESSION_up_ref(session);
  }
}
int SSL_set_session(SSL *ssl, SSL_SESSION *session) {
  if (ssl->session == session) {
    return 1;
  }

  SSL_SESSION_free(ssl->session);
  ssl->session = session;
  if (session != NULL) {
    SSL_SESSION_up_ref(session);
    ssl->verify_result = session->verify_result;
  }

  return 1;
}
Exemple #6
0
SSL_SESSION *SSL_get1_session(SSL *ssl)
/* variant of SSL_get_session: caller really gets something */
{
    SSL_SESSION *sess;
    /*
     * Need to lock this all up rather than just use CRYPTO_add so that
     * somebody doesn't free ssl->session between when we check it's non-null
     * and when we up the reference count.
     */
    CRYPTO_THREAD_read_lock(ssl->lock);
    sess = ssl->session;
    if (sess)
        SSL_SESSION_up_ref(sess);
    CRYPTO_THREAD_unlock(ssl->lock);
    return sess;
}
Exemple #7
0
int SSL_set_session(SSL *s, SSL_SESSION *session)
{
    ssl_clear_bad_session(s);
    if (s->ctx->method != s->method) {
        if (!SSL_set_ssl_method(s, s->ctx->method))
            return 0;
    }

    if (session != NULL) {
        SSL_SESSION_up_ref(session);
        s->verify_result = session->verify_result;
    }
    SSL_SESSION_free(s->session);
    s->session = session;

    return 1;
}
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *session) {
  /* Although |session| is inserted into two structures (a doubly-linked list
   * and the hash table), |ctx| only takes one reference. */
  SSL_SESSION_up_ref(session);

  SSL_SESSION *old_session;
  CRYPTO_MUTEX_lock_write(&ctx->lock);
  if (!lh_SSL_SESSION_insert(ctx->sessions, &old_session, session)) {
    CRYPTO_MUTEX_unlock(&ctx->lock);
    SSL_SESSION_free(session);
    return 0;
  }

  if (old_session != NULL) {
    if (old_session == session) {
      /* |session| was already in the cache. */
      CRYPTO_MUTEX_unlock(&ctx->lock);
      SSL_SESSION_free(old_session);
      return 0;
    }

    /* There was a session ID collision. |old_session| must be removed from
     * the linked list and released. */
    SSL_SESSION_list_remove(ctx, old_session);
    SSL_SESSION_free(old_session);
  }

  SSL_SESSION_list_add(ctx, session);

  /* Enforce any cache size limits. */
  if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
    while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
      if (!remove_session_lock(ctx, ctx->session_cache_tail, 0)) {
        break;
      }
    }
  }

  CRYPTO_MUTEX_unlock(&ctx->lock);
  return 1;
}
/* ssl_lookup_session looks up |session_id| in the session cache and sets
 * |*out_session| to an |SSL_SESSION| object if found. The caller takes
 * ownership of the result. */
static enum ssl_session_result_t ssl_lookup_session(
    SSL *ssl, SSL_SESSION **out_session, const uint8_t *session_id,
    size_t session_id_len) {
  *out_session = NULL;

  if (session_id_len == 0 || session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
    return ssl_session_success;
  }

  SSL_SESSION *session;
  /* Try the internal cache, if it exists. */
  if (!(ssl->initial_ctx->session_cache_mode &
        SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
    SSL_SESSION data;
    data.ssl_version = ssl->version;
    data.session_id_length = session_id_len;
    memcpy(data.session_id, session_id, session_id_len);

    CRYPTO_MUTEX_lock_read(&ssl->initial_ctx->lock);
    session = lh_SSL_SESSION_retrieve(ssl->initial_ctx->sessions, &data);
    if (session != NULL) {
      SSL_SESSION_up_ref(session);
    }
    /* TODO(davidben): This should probably move it to the front of the list. */
    CRYPTO_MUTEX_unlock(&ssl->initial_ctx->lock);

    if (session != NULL) {
      *out_session = session;
      return ssl_session_success;
    }
  }

  /* Fall back to the external cache, if it exists. */
  if (ssl->initial_ctx->get_session_cb == NULL) {
    return ssl_session_success;
  }
  int copy = 1;
  session = ssl->initial_ctx->get_session_cb(ssl, (uint8_t *)session_id,
                                             session_id_len, &copy);
  if (session == NULL) {
    return ssl_session_success;
  }
  if (session == SSL_magic_pending_session_ptr()) {
    return ssl_session_retry;
  }

  /* Increment reference count now if the session callback asks us to do so
   * (note that if the session structures returned by the callback are shared
   * between threads, it must handle the reference count itself [i.e. copy ==
   * 0], or things won't be thread-safe). */
  if (copy) {
    SSL_SESSION_up_ref(session);
  }

  /* Add the externally cached session to the internal cache if necessary. */
  if (!(ssl->initial_ctx->session_cache_mode &
        SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
    SSL_CTX_add_session(ssl->initial_ctx, session);
  }

  *out_session = session;
  return ssl_session_success;
}
SSL_SESSION *SSL_get1_session(SSL *ssl) {
  /* variant of SSL_get_session: caller really gets something */
  return SSL_SESSION_up_ref(ssl->session);
}
Exemple #11
0
/* ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
 * connection. It is only called by servers.
 *
 *   ctx: contains the early callback context, which is the result of a
 *       shallow parse of the ClientHello.
 *
 * Returns:
 *   -1: error
 *    0: a session may have been found.
 *
 * Side effects:
 *   - If a session is found then s->session is pointed at it (after freeing an
 *     existing session if need be) and s->verify_result is set from the session.
 *   - Both for new and resumed sessions, s->tlsext_ticket_expected is set to 1
 *     if the server should issue a new session ticket (to 0 otherwise). */
int ssl_get_prev_session(SSL *s, const struct ssl_early_callback_ctx *ctx) {
  /* This is used only by servers. */
  SSL_SESSION *ret = NULL;
  int fatal = 0;
  int try_session_cache = 1;
  int r;

  if (ctx->session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
    goto err;
  }

  if (ctx->session_id_len == 0) {
    try_session_cache = 0;
  }

  r = tls1_process_ticket(s, ctx, &ret); /* sets s->tlsext_ticket_expected */
  switch (r) {
    case -1: /* Error during processing */
      fatal = 1;
      goto err;

    case 0:  /* No ticket found */
    case 1:  /* Zero length ticket found */
      break; /* Ok to carry on processing session id. */

    case 2:  /* Ticket found but not decrypted. */
    case 3:  /* Ticket decrypted, *ret has been set. */
      try_session_cache = 0;
      break;

    default:
      abort();
  }

  if (try_session_cache && ret == NULL &&
      !(s->initial_ctx->session_cache_mode &
        SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
    SSL_SESSION data;
    data.ssl_version = s->version;
    data.session_id_length = ctx->session_id_len;
    if (ctx->session_id_len == 0) {
      return 0;
    }
    memcpy(data.session_id, ctx->session_id, ctx->session_id_len);
    CRYPTO_r_lock(CRYPTO_LOCK_SSL_CTX);
    ret = SSL_SESSION_up_ref(lh_SSL_SESSION_retrieve(s->initial_ctx->sessions,
                                                     &data));
    CRYPTO_r_unlock(CRYPTO_LOCK_SSL_CTX);
  }

  if (try_session_cache && ret == NULL &&
      s->initial_ctx->get_session_cb != NULL) {
    int copy = 1;

    ret = s->initial_ctx->get_session_cb(s, (uint8_t *)ctx->session_id,
                                         ctx->session_id_len, &copy);
    if (ret != NULL) {
      if (ret == SSL_magic_pending_session_ptr()) {
        /* This is a magic value which indicates that the callback needs to
         * unwind the stack and figure out the session asynchronously. */
        return PENDING_SESSION;
      }

      /* Increment reference count now if the session callback asks us to do so
       * (note that if the session structures returned by the callback are
       * shared between threads, it must handle the reference count itself
       * [i.e. copy == 0], or things won't be thread-safe). */
      if (copy) {
        SSL_SESSION_up_ref(ret);
      }

      /* Add the externally cached session to the internal cache as well if and
       * only if we are supposed to. */
      if (!(s->initial_ctx->session_cache_mode &
            SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
        /* The following should not return 1, otherwise, things are very
         * strange */
        SSL_CTX_add_session(s->initial_ctx, ret);
      }
    }
  }

  if (ret == NULL) {
    goto err;
  }

  /* Now ret is non-NULL and we own one of its reference counts. */

  if (ret->sid_ctx_length != s->sid_ctx_length ||
      memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) {
    /* We have the session requested by the client, but we don't want to use it
     * in this context. */
    goto err; /* treat like cache miss */
  }

  if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
    /* We can't be sure if this session is being used out of context, which is
     * especially important for SSL_VERIFY_PEER. The application should have
     * used SSL[_CTX]_set_session_id_context.
     *
     * For this error case, we generate an error instead of treating the event
     * like a cache miss (otherwise it would be easy for applications to
     * effectively disable the session cache by accident without anyone
     * noticing). */
    OPENSSL_PUT_ERROR(SSL, ssl_get_prev_session,
                      SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
    fatal = 1;
    goto err;
  }

  if (ret->timeout < (long)(time(NULL) - ret->time)) {
    /* timeout */
    if (try_session_cache) {
      /* session was from the cache, so remove it */
      SSL_CTX_remove_session(s->initial_ctx, ret);
    }
    goto err;
  }

  if (s->session != NULL) {
    SSL_SESSION_free(s->session);
  }
  s->session = ret;
  s->verify_result = s->session->verify_result;
  return 1;

err:
  if (ret != NULL) {
    SSL_SESSION_free(ret);
    if (!try_session_cache) {
      /* The session was from a ticket, so we should
       * issue a ticket for the new session */
      s->tlsext_ticket_expected = 1;
    }
  }
  if (fatal) {
    return -1;
  }
  return 0;
}
Exemple #12
0
int SSL_CTX_add_session(SSL_CTX *ctx, SSL_SESSION *c)
{
    int ret = 0;
    SSL_SESSION *s;

    /*
     * add just 1 reference count for the SSL_CTX's session cache even though
     * it has two ways of access: each session is in a doubly linked list and
     * an lhash
     */
    SSL_SESSION_up_ref(c);
    /*
     * if session c is in already in cache, we take back the increment later
     */

    CRYPTO_THREAD_write_lock(ctx->lock);
    s = lh_SSL_SESSION_insert(ctx->sessions, c);

    /*
     * s != NULL iff we already had a session with the given PID. In this
     * case, s == c should hold (then we did not really modify
     * ctx->sessions), or we're in trouble.
     */
    if (s != NULL && s != c) {
        /* We *are* in trouble ... */
        SSL_SESSION_list_remove(ctx, s);
        SSL_SESSION_free(s);
        /*
         * ... so pretend the other session did not exist in cache (we cannot
         * handle two SSL_SESSION structures with identical session ID in the
         * same cache, which could happen e.g. when two threads concurrently
         * obtain the same session from an external cache)
         */
        s = NULL;
    } else if (s == NULL &&
               lh_SSL_SESSION_retrieve(ctx->sessions, c) == NULL) {
        /* s == NULL can also mean OOM error in lh_SSL_SESSION_insert ... */

        /*
         * ... so take back the extra reference and also don't add
         * the session to the SSL_SESSION_list at this time
         */
        s = c;
    }

    /* Put at the head of the queue unless it is already in the cache */
    if (s == NULL)
        SSL_SESSION_list_add(ctx, c);

    if (s != NULL) {
        /*
         * existing cache entry -- decrement previously incremented reference
         * count because it already takes into account the cache
         */

        SSL_SESSION_free(s);    /* s == c */
        ret = 0;
    } else {
        /*
         * new cache entry -- remove old ones if cache has become too large
         */

        ret = 1;

        if (SSL_CTX_sess_get_cache_size(ctx) > 0) {
            while (SSL_CTX_sess_number(ctx) > SSL_CTX_sess_get_cache_size(ctx)) {
                if (!remove_session_lock(ctx, ctx->session_cache_tail, 0))
                    break;
                else
                    ctx->stats.sess_cache_full++;
            }
        }
    }
    CRYPTO_THREAD_unlock(ctx->lock);
    return ret;
}
Exemple #13
0
/*-
 * ssl_get_prev attempts to find an SSL_SESSION to be used to resume this
 * connection. It is only called by servers.
 *
 *   hello: The parsed ClientHello data
 *
 * Returns:
 *   -1: fatal error
 *    0: no session found
 *    1: a session may have been found.
 *
 * Side effects:
 *   - If a session is found then s->session is pointed at it (after freeing an
 *     existing session if need be) and s->verify_result is set from the session.
 *   - Both for new and resumed sessions, s->ext.ticket_expected is set to 1
 *     if the server should issue a new session ticket (to 0 otherwise).
 */
int ssl_get_prev_session(SSL *s, CLIENTHELLO_MSG *hello, int *al)
{
    /* This is used only by servers. */

    SSL_SESSION *ret = NULL;
    int fatal = 0;
    int try_session_cache = 0;
    TICKET_RETURN r;

    if (SSL_IS_TLS13(s)) {
        if (!tls_parse_extension(s, TLSEXT_IDX_psk_kex_modes,
                                 SSL_EXT_CLIENT_HELLO, hello->pre_proc_exts,
                                 NULL, 0, al)
                || !tls_parse_extension(s, TLSEXT_IDX_psk, SSL_EXT_CLIENT_HELLO,
                                        hello->pre_proc_exts, NULL, 0, al))
            return -1;

        ret = s->session;
    } else {
        /* sets s->ext.ticket_expected */
        r = tls_get_ticket_from_client(s, hello, &ret);
        switch (r) {
        case TICKET_FATAL_ERR_MALLOC:
        case TICKET_FATAL_ERR_OTHER:
            fatal = 1;
            goto err;
        case TICKET_NONE:
        case TICKET_EMPTY:
            try_session_cache = 1;
            break;
        case TICKET_NO_DECRYPT:
        case TICKET_SUCCESS:
        case TICKET_SUCCESS_RENEW:
            break;
        }
    }

    if (try_session_cache &&
        ret == NULL &&
        !(s->session_ctx->session_cache_mode &
          SSL_SESS_CACHE_NO_INTERNAL_LOOKUP)) {
        SSL_SESSION data;

        data.ssl_version = s->version;
        memcpy(data.session_id, hello->session_id, hello->session_id_len);
        data.session_id_length = hello->session_id_len;

        CRYPTO_THREAD_read_lock(s->session_ctx->lock);
        ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
        if (ret != NULL) {
            /* don't allow other threads to steal it: */
            SSL_SESSION_up_ref(ret);
        }
        CRYPTO_THREAD_unlock(s->session_ctx->lock);
        if (ret == NULL)
            s->session_ctx->stats.sess_miss++;
    }

    if (try_session_cache &&
        ret == NULL && s->session_ctx->get_session_cb != NULL) {
        int copy = 1;

        ret = s->session_ctx->get_session_cb(s, hello->session_id,
                                             hello->session_id_len,
                                             &copy);

        if (ret != NULL) {
            s->session_ctx->stats.sess_cb_hit++;

            /*
             * Increment reference count now if the session callback asks us
             * to do so (note that if the session structures returned by the
             * callback are shared between threads, it must handle the
             * reference count itself [i.e. copy == 0], or things won't be
             * thread-safe).
             */
            if (copy)
                SSL_SESSION_up_ref(ret);

            /*
             * Add the externally cached session to the internal cache as
             * well if and only if we are supposed to.
             */
            if (!
                (s->session_ctx->session_cache_mode &
                 SSL_SESS_CACHE_NO_INTERNAL_STORE)) {
                /*
                 * The following should not return 1, otherwise, things are
                 * very strange
                 */
                if (SSL_CTX_add_session(s->session_ctx, ret))
                    goto err;
            }
        }
    }

    if (ret == NULL)
        goto err;

    /* Now ret is non-NULL and we own one of its reference counts. */

    /* Check TLS version consistency */
    if (ret->ssl_version != s->version)
        goto err;

    if (ret->sid_ctx_length != s->sid_ctx_length
        || memcmp(ret->sid_ctx, s->sid_ctx, ret->sid_ctx_length)) {
        /*
         * We have the session requested by the client, but we don't want to
         * use it in this context.
         */
        goto err;               /* treat like cache miss */
    }

    if ((s->verify_mode & SSL_VERIFY_PEER) && s->sid_ctx_length == 0) {
        /*
         * We can't be sure if this session is being used out of context,
         * which is especially important for SSL_VERIFY_PEER. The application
         * should have used SSL[_CTX]_set_session_id_context. For this error
         * case, we generate an error instead of treating the event like a
         * cache miss (otherwise it would be easy for applications to
         * effectively disable the session cache by accident without anyone
         * noticing).
         */

        SSLerr(SSL_F_SSL_GET_PREV_SESSION,
               SSL_R_SESSION_ID_CONTEXT_UNINITIALIZED);
        fatal = 1;
        goto err;
    }

    if (ret->timeout < (long)(time(NULL) - ret->time)) { /* timeout */
        s->session_ctx->stats.sess_timeout++;
        if (try_session_cache) {
            /* session was from the cache, so remove it */
            SSL_CTX_remove_session(s->session_ctx, ret);
        }
        goto err;
    }

    /* Check extended master secret extension consistency */
    if (ret->flags & SSL_SESS_FLAG_EXTMS) {
        /* If old session includes extms, but new does not: abort handshake */
        if (!(s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS)) {
            SSLerr(SSL_F_SSL_GET_PREV_SESSION, SSL_R_INCONSISTENT_EXTMS);
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
            fatal = 1;
            goto err;
        }
    } else if (s->s3->flags & TLS1_FLAGS_RECEIVED_EXTMS) {
        /* If new session includes extms, but old does not: do not resume */
        goto err;
    }

    if (!SSL_IS_TLS13(s)) {
        /* We already did this for TLS1.3 */
        SSL_SESSION_free(s->session);
        s->session = ret;
    }

    s->session_ctx->stats.sess_hit++;
    s->verify_result = s->session->verify_result;
    return 1;

 err:
    if (ret != NULL) {
        SSL_SESSION_free(ret);
        /* In TLSv1.3 s->session was already set to ret, so we NULL it out */
        if (SSL_IS_TLS13(s))
            s->session = NULL;

        if (!try_session_cache) {
            /*
             * The session was from a ticket, so we should issue a ticket for
             * the new session
             */
            s->ext.ticket_expected = 1;
        }
    }
    if (fatal) {
        *al = SSL_AD_INTERNAL_ERROR;
        return -1;
    }

    return 0;
}
Exemple #14
0
SSL_SESSION *lookup_sess_in_cache(SSL *s, const unsigned char *sess_id,
                                  size_t sess_id_len)
{
    SSL_SESSION *ret = NULL;

    if ((s->session_ctx->session_cache_mode
         & SSL_SESS_CACHE_NO_INTERNAL_LOOKUP) == 0) {
        SSL_SESSION data;

        data.ssl_version = s->version;
        if (!ossl_assert(sess_id_len <= SSL_MAX_SSL_SESSION_ID_LENGTH))
            return NULL;

        memcpy(data.session_id, sess_id, sess_id_len);
        data.session_id_length = sess_id_len;

        CRYPTO_THREAD_read_lock(s->session_ctx->lock);
        ret = lh_SSL_SESSION_retrieve(s->session_ctx->sessions, &data);
        if (ret != NULL) {
            /* don't allow other threads to steal it: */
            SSL_SESSION_up_ref(ret);
        }
        CRYPTO_THREAD_unlock(s->session_ctx->lock);
        if (ret == NULL)
            tsan_counter(&s->session_ctx->stats.sess_miss);
    }

    if (ret == NULL && s->session_ctx->get_session_cb != NULL) {
        int copy = 1;

        ret = s->session_ctx->get_session_cb(s, sess_id, sess_id_len, &copy);

        if (ret != NULL) {
            tsan_counter(&s->session_ctx->stats.sess_cb_hit);

            /*
             * Increment reference count now if the session callback asks us
             * to do so (note that if the session structures returned by the
             * callback are shared between threads, it must handle the
             * reference count itself [i.e. copy == 0], or things won't be
             * thread-safe).
             */
            if (copy)
                SSL_SESSION_up_ref(ret);

            /*
             * Add the externally cached session to the internal cache as
             * well if and only if we are supposed to.
             */
            if ((s->session_ctx->session_cache_mode &
                 SSL_SESS_CACHE_NO_INTERNAL_STORE) == 0) {
                /*
                 * Either return value of SSL_CTX_add_session should not
                 * interrupt the session resumption process. The return
                 * value is intentionally ignored.
                 */
                (void)SSL_CTX_add_session(s->session_ctx, ret);
            }
        }
    }

    return ret;
}