366 lines
8.8 KiB
C
Executable File
366 lines
8.8 KiB
C
Executable File
/* $OpenBSD: ct_log.c,v 1.5 2021/12/18 16:34:52 tb Exp $ */
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/* Author: Adam Eijdenberg <adam.eijdenberg@gmail.com>. */
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/* ====================================================================
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* Copyright (c) 1998-2016 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* openssl-core@openssl.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#include <stdlib.h>
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#include <string.h>
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#include <openssl/conf.h>
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#include <openssl/ct.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
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#include <openssl/safestack.h>
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#include "cryptlib.h"
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/*
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* Information about a CT log server.
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*/
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struct ctlog_st {
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char *name;
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uint8_t log_id[CT_V1_HASHLEN];
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EVP_PKEY *public_key;
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};
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/*
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* A store for multiple CTLOG instances.
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* It takes ownership of any CTLOG instances added to it.
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*/
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struct ctlog_store_st {
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STACK_OF(CTLOG) *logs;
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};
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/* The context when loading a CT log list from a CONF file. */
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typedef struct ctlog_store_load_ctx_st {
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CTLOG_STORE *log_store;
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CONF *conf;
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size_t invalid_log_entries;
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} CTLOG_STORE_LOAD_CTX;
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/*
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* Creates an empty context for loading a CT log store.
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* It should be populated before use.
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*/
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static CTLOG_STORE_LOAD_CTX *ctlog_store_load_ctx_new(void);
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/*
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* Deletes a CT log store load context.
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* Does not delete any of the fields.
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*/
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static void ctlog_store_load_ctx_free(CTLOG_STORE_LOAD_CTX *ctx);
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static CTLOG_STORE_LOAD_CTX *
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ctlog_store_load_ctx_new(void)
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{
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CTLOG_STORE_LOAD_CTX *ctx = calloc(1, sizeof(*ctx));
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if (ctx == NULL)
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CTerror(ERR_R_MALLOC_FAILURE);
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return ctx;
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}
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static void
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ctlog_store_load_ctx_free(CTLOG_STORE_LOAD_CTX *ctx)
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{
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free(ctx);
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}
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/* Converts a log's public key into a SHA256 log ID */
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static int
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ct_v1_log_id_from_pkey(EVP_PKEY *pkey, unsigned char log_id[CT_V1_HASHLEN])
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{
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int ret = 0;
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unsigned char *pkey_der = NULL;
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int pkey_der_len = i2d_PUBKEY(pkey, &pkey_der);
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if (pkey_der_len <= 0) {
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CTerror(CT_R_LOG_KEY_INVALID);
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goto err;
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}
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SHA256(pkey_der, pkey_der_len, log_id);
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ret = 1;
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err:
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free(pkey_der);
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return ret;
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}
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CTLOG_STORE *
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CTLOG_STORE_new(void)
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{
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CTLOG_STORE *ret = calloc(1, sizeof(*ret));
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if (ret == NULL) {
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CTerror(ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ret->logs = sk_CTLOG_new_null();
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if (ret->logs == NULL)
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goto err;
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return ret;
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err:
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free(ret);
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return NULL;
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}
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void
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CTLOG_STORE_free(CTLOG_STORE *store)
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{
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if (store != NULL) {
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sk_CTLOG_pop_free(store->logs, CTLOG_free);
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free(store);
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}
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}
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static int
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ctlog_new_from_conf(CTLOG **ct_log, const CONF *conf, const char *section)
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{
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const char *description = NCONF_get_string(conf, section,
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"description");
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char *pkey_base64;
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if (description == NULL) {
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CTerror(CT_R_LOG_CONF_MISSING_DESCRIPTION);
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return 0;
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}
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pkey_base64 = NCONF_get_string(conf, section, "key");
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if (pkey_base64 == NULL) {
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CTerror(CT_R_LOG_CONF_MISSING_KEY);
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return 0;
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}
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return CTLOG_new_from_base64(ct_log, pkey_base64, description);
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}
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int
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CTLOG_STORE_load_default_file(CTLOG_STORE *store)
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{
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return CTLOG_STORE_load_file(store, CTLOG_FILE);
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}
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/*
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* Called by CONF_parse_list, which stops if this returns <= 0,
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* Otherwise, one bad log entry would stop loading of any of
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* the following log entries.
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* It may stop parsing and returns -1 on any internal (malloc) error.
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*/
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static int
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ctlog_store_load_log(const char *log_name, int log_name_len, void *arg)
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{
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CTLOG_STORE_LOAD_CTX *load_ctx = arg;
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CTLOG *ct_log = NULL;
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/* log_name may not be null-terminated, so fix that before using it */
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char *tmp;
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int ret = 0;
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/* log_name will be NULL for empty list entries */
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if (log_name == NULL)
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return 1;
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tmp = strndup(log_name, log_name_len);
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if (tmp == NULL)
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goto mem_err;
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ret = ctlog_new_from_conf(&ct_log, load_ctx->conf, tmp);
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free(tmp);
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if (ret < 0) {
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/* Propagate any internal error */
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return ret;
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}
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if (ret == 0) {
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/* If we can't load this log, record that fact and skip it */
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++load_ctx->invalid_log_entries;
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return 1;
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}
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if (!sk_CTLOG_push(load_ctx->log_store->logs, ct_log)) {
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goto mem_err;
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}
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return 1;
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mem_err:
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CTLOG_free(ct_log);
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CTerror(ERR_R_MALLOC_FAILURE);
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return -1;
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}
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int
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CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file)
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{
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int ret = 0;
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char *enabled_logs;
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CTLOG_STORE_LOAD_CTX* load_ctx = ctlog_store_load_ctx_new();
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if (load_ctx == NULL)
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return 0;
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load_ctx->log_store = store;
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load_ctx->conf = NCONF_new(NULL);
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if (load_ctx->conf == NULL)
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goto end;
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if (NCONF_load(load_ctx->conf, file, NULL) <= 0) {
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CTerror(CT_R_LOG_CONF_INVALID);
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goto end;
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}
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enabled_logs = NCONF_get_string(load_ctx->conf, NULL, "enabled_logs");
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if (enabled_logs == NULL) {
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CTerror(CT_R_LOG_CONF_INVALID);
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goto end;
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}
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if (!CONF_parse_list(enabled_logs, ',', 1, ctlog_store_load_log, load_ctx) ||
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load_ctx->invalid_log_entries > 0) {
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CTerror(CT_R_LOG_CONF_INVALID);
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goto end;
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}
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ret = 1;
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end:
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NCONF_free(load_ctx->conf);
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ctlog_store_load_ctx_free(load_ctx);
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return ret;
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}
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/*
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* Initialize a new CTLOG object.
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* Takes ownership of the public key.
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* Copies the name.
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*/
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CTLOG *
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CTLOG_new(EVP_PKEY *public_key, const char *name)
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{
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CTLOG *ret = calloc(1, sizeof(*ret));
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if (ret == NULL) {
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CTerror(ERR_R_MALLOC_FAILURE);
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return NULL;
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}
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ret->name = strdup(name);
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if (ret->name == NULL) {
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CTerror(ERR_R_MALLOC_FAILURE);
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goto err;
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}
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if (ct_v1_log_id_from_pkey(public_key, ret->log_id) != 1)
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goto err;
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ret->public_key = public_key;
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return ret;
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err:
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CTLOG_free(ret);
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return NULL;
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}
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/* Frees CT log and associated structures */
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void
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CTLOG_free(CTLOG *log)
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{
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if (log != NULL) {
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free(log->name);
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EVP_PKEY_free(log->public_key);
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free(log);
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}
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}
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const char *
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CTLOG_get0_name(const CTLOG *log)
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{
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return log->name;
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}
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void
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CTLOG_get0_log_id(const CTLOG *log, const uint8_t **log_id, size_t *log_id_len)
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{
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*log_id = log->log_id;
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*log_id_len = CT_V1_HASHLEN;
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}
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EVP_PKEY *
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CTLOG_get0_public_key(const CTLOG *log)
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{
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return log->public_key;
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}
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/*
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* Given a log ID, finds the matching log.
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* Returns NULL if no match found.
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*/
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const CTLOG *
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CTLOG_STORE_get0_log_by_id(const CTLOG_STORE *store, const uint8_t *log_id,
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size_t log_id_len)
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{
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int i;
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for (i = 0; i < sk_CTLOG_num(store->logs); ++i) {
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const CTLOG *log = sk_CTLOG_value(store->logs, i);
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if (memcmp(log->log_id, log_id, log_id_len) == 0)
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return log;
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}
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return NULL;
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}
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