574 lines
17 KiB
C
574 lines
17 KiB
C
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/*
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* crypto_kernel.c
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*
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* header for the cryptographic kernel
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*
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* David A. McGrew
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* Cisco Systems, Inc.
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*/
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/*
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*
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* Copyright(c) 2001-2017 Cisco Systems, Inc.
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* 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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* 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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* Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* Neither the name of the Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
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* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include "alloc.h"
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#include "crypto_kernel.h"
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/* the debug module for the crypto_kernel */
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srtp_debug_module_t srtp_mod_crypto_kernel = {
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0, /* debugging is off by default */
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"crypto kernel" /* printable name for module */
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};
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/*
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* other generic debug modules that can be included in the kernel
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*/
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extern srtp_debug_module_t srtp_mod_auth;
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extern srtp_debug_module_t srtp_mod_cipher;
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extern srtp_debug_module_t mod_stat;
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extern srtp_debug_module_t mod_alloc;
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/*
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* cipher types that can be included in the kernel
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*/
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extern srtp_cipher_type_t srtp_null_cipher;
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extern srtp_cipher_type_t srtp_aes_icm_128;
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extern srtp_cipher_type_t srtp_aes_icm_256;
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#ifdef OPENSSL
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extern srtp_cipher_type_t srtp_aes_icm_192;
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extern srtp_cipher_type_t srtp_aes_gcm_128_openssl;
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extern srtp_cipher_type_t srtp_aes_gcm_256_openssl;
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#endif
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/* debug modules for cipher types */
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extern srtp_debug_module_t srtp_mod_aes_icm;
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#ifdef OPENSSL
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extern srtp_debug_module_t srtp_mod_aes_gcm;
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#endif
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/*
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* auth func types that can be included in the kernel
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*/
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extern srtp_auth_type_t srtp_null_auth;
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extern srtp_auth_type_t srtp_hmac;
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/* debug modules for auth types */
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extern srtp_debug_module_t srtp_mod_hmac;
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/* crypto_kernel is a global variable, the only one of its datatype */
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srtp_crypto_kernel_t crypto_kernel = {
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srtp_crypto_kernel_state_insecure, /* start off in insecure state */
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NULL, /* no cipher types yet */
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NULL, /* no auth types yet */
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NULL /* no debug modules yet */
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};
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#define MAX_RNG_TRIALS 25
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srtp_err_status_t srtp_crypto_kernel_init ()
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{
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srtp_err_status_t status;
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/* check the security state */
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if (crypto_kernel.state == srtp_crypto_kernel_state_secure) {
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/*
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* we're already in the secure state, but we've been asked to
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* re-initialize, so we just re-run the self-tests and then return
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*/
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return srtp_crypto_kernel_status();
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}
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/* initialize error reporting system */
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status = srtp_err_reporting_init();
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if (status) {
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return status;
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}
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/* load debug modules */
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status = srtp_crypto_kernel_load_debug_module(&srtp_mod_crypto_kernel);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&srtp_mod_auth);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&srtp_mod_cipher);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&mod_stat);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&mod_alloc);
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if (status) {
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return status;
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}
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/* load cipher types */
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status = srtp_crypto_kernel_load_cipher_type(&srtp_null_cipher, SRTP_NULL_CIPHER);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_128, SRTP_AES_ICM_128);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_256, SRTP_AES_ICM_256);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&srtp_mod_aes_icm);
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if (status) {
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return status;
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}
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#ifdef OPENSSL
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status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_icm_192, SRTP_AES_ICM_192);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_gcm_128_openssl, SRTP_AES_GCM_128);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_cipher_type(&srtp_aes_gcm_256_openssl, SRTP_AES_GCM_256);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&srtp_mod_aes_gcm);
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if (status) {
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return status;
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}
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#endif
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/* load auth func types */
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status = srtp_crypto_kernel_load_auth_type(&srtp_null_auth, SRTP_NULL_AUTH);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_auth_type(&srtp_hmac, SRTP_HMAC_SHA1);
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if (status) {
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return status;
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}
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status = srtp_crypto_kernel_load_debug_module(&srtp_mod_hmac);
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if (status) {
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return status;
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}
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/* change state to secure */
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crypto_kernel.state = srtp_crypto_kernel_state_secure;
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return srtp_err_status_ok;
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}
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srtp_err_status_t srtp_crypto_kernel_status ()
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{
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srtp_err_status_t status;
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srtp_kernel_cipher_type_t *ctype = crypto_kernel.cipher_type_list;
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srtp_kernel_auth_type_t *atype = crypto_kernel.auth_type_list;
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/* for each cipher type, describe and test */
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while (ctype != NULL) {
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srtp_err_report(srtp_err_level_info, "cipher: %s\n", ctype->cipher_type->description);
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srtp_err_report(srtp_err_level_info, " self-test: ");
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status = srtp_cipher_type_self_test(ctype->cipher_type);
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if (status) {
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srtp_err_report(srtp_err_level_error, "failed with error code %d\n", status);
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exit(status);
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}
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srtp_err_report(srtp_err_level_info, "passed\n");
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ctype = ctype->next;
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}
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/* for each auth type, describe and test */
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while (atype != NULL) {
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srtp_err_report(srtp_err_level_info, "auth func: %s\n", atype->auth_type->description);
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srtp_err_report(srtp_err_level_info, " self-test: ");
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status = srtp_auth_type_self_test(atype->auth_type);
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if (status) {
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srtp_err_report(srtp_err_level_error, "failed with error code %d\n", status);
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exit(status);
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}
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srtp_err_report(srtp_err_level_info, "passed\n");
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atype = atype->next;
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}
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srtp_crypto_kernel_list_debug_modules();
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return srtp_err_status_ok;
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}
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srtp_err_status_t srtp_crypto_kernel_list_debug_modules ()
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{
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srtp_kernel_debug_module_t *dm = crypto_kernel.debug_module_list;
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/* describe each debug module */
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srtp_err_report(srtp_err_level_info, "debug modules loaded:\n");
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while (dm != NULL) {
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srtp_err_report(srtp_err_level_info, " %s ", dm->mod->name);
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if (dm->mod->on) {
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srtp_err_report(srtp_err_level_info, "(on)\n");
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} else{
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srtp_err_report(srtp_err_level_info, "(off)\n");
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}
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dm = dm->next;
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}
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return srtp_err_status_ok;
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}
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srtp_err_status_t srtp_crypto_kernel_shutdown ()
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{
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/*
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* free dynamic memory used in crypto_kernel at present
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*/
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/* walk down cipher type list, freeing memory */
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while (crypto_kernel.cipher_type_list != NULL) {
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srtp_kernel_cipher_type_t *ctype = crypto_kernel.cipher_type_list;
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crypto_kernel.cipher_type_list = ctype->next;
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debug_print(srtp_mod_crypto_kernel,
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"freeing memory for cipher %s",
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ctype->cipher_type->description);
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srtp_crypto_free(ctype);
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}
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/* walk down authetication module list, freeing memory */
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while (crypto_kernel.auth_type_list != NULL) {
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srtp_kernel_auth_type_t *atype = crypto_kernel.auth_type_list;
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crypto_kernel.auth_type_list = atype->next;
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debug_print(srtp_mod_crypto_kernel,
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"freeing memory for authentication %s",
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atype->auth_type->description);
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srtp_crypto_free(atype);
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}
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/* walk down debug module list, freeing memory */
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while (crypto_kernel.debug_module_list != NULL) {
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srtp_kernel_debug_module_t *kdm = crypto_kernel.debug_module_list;
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crypto_kernel.debug_module_list = kdm->next;
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debug_print(srtp_mod_crypto_kernel,
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"freeing memory for debug module %s",
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kdm->mod->name);
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srtp_crypto_free(kdm);
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}
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/* return to insecure state */
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crypto_kernel.state = srtp_crypto_kernel_state_insecure;
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return srtp_err_status_ok;
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}
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static inline srtp_err_status_t srtp_crypto_kernel_do_load_cipher_type (const srtp_cipher_type_t *new_ct, srtp_cipher_type_id_t id, int replace)
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{
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srtp_kernel_cipher_type_t *ctype, *new_ctype;
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srtp_err_status_t status;
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/* defensive coding */
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if (new_ct == NULL) {
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return srtp_err_status_bad_param;
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}
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if (new_ct->id != id) {
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return srtp_err_status_bad_param;
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}
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/* check cipher type by running self-test */
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status = srtp_cipher_type_self_test(new_ct);
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if (status) {
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return status;
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}
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/* walk down list, checking if this type is in the list already */
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ctype = crypto_kernel.cipher_type_list;
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while (ctype != NULL) {
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if (id == ctype->id) {
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if (!replace) {
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return srtp_err_status_bad_param;
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}
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status = srtp_cipher_type_test(new_ct, ctype->cipher_type->test_data);
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if (status) {
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return status;
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}
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new_ctype = ctype;
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break;
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}else if (new_ct == ctype->cipher_type) {
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return srtp_err_status_bad_param;
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}
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ctype = ctype->next;
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}
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/* if not found, put new_ct at the head of the list */
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if (ctype == NULL) {
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/* allocate memory */
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new_ctype = (srtp_kernel_cipher_type_t*)srtp_crypto_alloc(sizeof(srtp_kernel_cipher_type_t));
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if (new_ctype == NULL) {
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return srtp_err_status_alloc_fail;
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}
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new_ctype->next = crypto_kernel.cipher_type_list;
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/* set head of list to new cipher type */
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crypto_kernel.cipher_type_list = new_ctype;
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}
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/* set fields */
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new_ctype->cipher_type = new_ct;
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new_ctype->id = id;
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return srtp_err_status_ok;
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_load_cipher_type (const srtp_cipher_type_t *new_ct, srtp_cipher_type_id_t id)
|
||
|
|
{
|
||
|
|
return srtp_crypto_kernel_do_load_cipher_type(new_ct, id, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_replace_cipher_type (const srtp_cipher_type_t *new_ct, srtp_cipher_type_id_t id)
|
||
|
|
{
|
||
|
|
return srtp_crypto_kernel_do_load_cipher_type(new_ct, id, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_do_load_auth_type (const srtp_auth_type_t *new_at, srtp_auth_type_id_t id, int replace)
|
||
|
|
{
|
||
|
|
srtp_kernel_auth_type_t *atype, *new_atype;
|
||
|
|
srtp_err_status_t status;
|
||
|
|
|
||
|
|
/* defensive coding */
|
||
|
|
if (new_at == NULL) {
|
||
|
|
return srtp_err_status_bad_param;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (new_at->id != id) {
|
||
|
|
return srtp_err_status_bad_param;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* check auth type by running self-test */
|
||
|
|
status = srtp_auth_type_self_test(new_at);
|
||
|
|
if (status) {
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* walk down list, checking if this type is in the list already */
|
||
|
|
atype = crypto_kernel.auth_type_list;
|
||
|
|
while (atype != NULL) {
|
||
|
|
if (id == atype->id) {
|
||
|
|
if (!replace) {
|
||
|
|
return srtp_err_status_bad_param;
|
||
|
|
}
|
||
|
|
status = srtp_auth_type_test(new_at, atype->auth_type->test_data);
|
||
|
|
if (status) {
|
||
|
|
return status;
|
||
|
|
}
|
||
|
|
new_atype = atype;
|
||
|
|
break;
|
||
|
|
}else if (new_at == atype->auth_type) {
|
||
|
|
return srtp_err_status_bad_param;
|
||
|
|
}
|
||
|
|
atype = atype->next;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* if not found, put new_at at the head of the list */
|
||
|
|
if (atype == NULL) {
|
||
|
|
/* allocate memory */
|
||
|
|
new_atype = (srtp_kernel_auth_type_t*)srtp_crypto_alloc(sizeof(srtp_kernel_auth_type_t));
|
||
|
|
if (new_atype == NULL) {
|
||
|
|
return srtp_err_status_alloc_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
new_atype->next = crypto_kernel.auth_type_list;
|
||
|
|
/* set head of list to new auth type */
|
||
|
|
crypto_kernel.auth_type_list = new_atype;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* set fields */
|
||
|
|
new_atype->auth_type = new_at;
|
||
|
|
new_atype->id = id;
|
||
|
|
|
||
|
|
return srtp_err_status_ok;
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_load_auth_type (const srtp_auth_type_t *new_at, srtp_auth_type_id_t id)
|
||
|
|
{
|
||
|
|
return srtp_crypto_kernel_do_load_auth_type(new_at, id, 0);
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_replace_auth_type (const srtp_auth_type_t *new_at, srtp_auth_type_id_t id)
|
||
|
|
{
|
||
|
|
return srtp_crypto_kernel_do_load_auth_type(new_at, id, 1);
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
const srtp_cipher_type_t * srtp_crypto_kernel_get_cipher_type (srtp_cipher_type_id_t id)
|
||
|
|
{
|
||
|
|
srtp_kernel_cipher_type_t *ctype;
|
||
|
|
|
||
|
|
/* walk down list, looking for id */
|
||
|
|
ctype = crypto_kernel.cipher_type_list;
|
||
|
|
while (ctype != NULL) {
|
||
|
|
if (id == ctype->id) {
|
||
|
|
return ctype->cipher_type;
|
||
|
|
}
|
||
|
|
ctype = ctype->next;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* haven't found the right one, indicate failure by returning NULL */
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_alloc_cipher (srtp_cipher_type_id_t id, srtp_cipher_pointer_t *cp, int key_len, int tag_len)
|
||
|
|
{
|
||
|
|
const srtp_cipher_type_t *ct;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* if the crypto_kernel is not yet initialized, we refuse to allocate
|
||
|
|
* any ciphers - this is a bit extra-paranoid
|
||
|
|
*/
|
||
|
|
if (crypto_kernel.state != srtp_crypto_kernel_state_secure) {
|
||
|
|
return srtp_err_status_init_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
ct = srtp_crypto_kernel_get_cipher_type(id);
|
||
|
|
if (!ct) {
|
||
|
|
return srtp_err_status_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ((ct)->alloc(cp, key_len, tag_len));
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
const srtp_auth_type_t * srtp_crypto_kernel_get_auth_type (srtp_auth_type_id_t id)
|
||
|
|
{
|
||
|
|
srtp_kernel_auth_type_t *atype;
|
||
|
|
|
||
|
|
/* walk down list, looking for id */
|
||
|
|
atype = crypto_kernel.auth_type_list;
|
||
|
|
while (atype != NULL) {
|
||
|
|
if (id == atype->id) {
|
||
|
|
return atype->auth_type;
|
||
|
|
}
|
||
|
|
atype = atype->next;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* haven't found the right one, indicate failure by returning NULL */
|
||
|
|
return NULL;
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_alloc_auth (srtp_auth_type_id_t id, srtp_auth_pointer_t *ap, int key_len, int tag_len)
|
||
|
|
{
|
||
|
|
const srtp_auth_type_t *at;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* if the crypto_kernel is not yet initialized, we refuse to allocate
|
||
|
|
* any auth functions - this is a bit extra-paranoid
|
||
|
|
*/
|
||
|
|
if (crypto_kernel.state != srtp_crypto_kernel_state_secure) {
|
||
|
|
return srtp_err_status_init_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
at = srtp_crypto_kernel_get_auth_type(id);
|
||
|
|
if (!at) {
|
||
|
|
return srtp_err_status_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
return ((at)->alloc(ap, key_len, tag_len));
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_load_debug_module (srtp_debug_module_t *new_dm)
|
||
|
|
{
|
||
|
|
srtp_kernel_debug_module_t *kdm, *new;
|
||
|
|
|
||
|
|
/* defensive coding */
|
||
|
|
if (new_dm == NULL) {
|
||
|
|
return srtp_err_status_bad_param;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* walk down list, checking if this type is in the list already */
|
||
|
|
kdm = crypto_kernel.debug_module_list;
|
||
|
|
while (kdm != NULL) {
|
||
|
|
if (strncmp(new_dm->name, kdm->mod->name, 64) == 0) {
|
||
|
|
return srtp_err_status_bad_param;
|
||
|
|
}
|
||
|
|
kdm = kdm->next;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* put new_dm at the head of the list */
|
||
|
|
/* allocate memory */
|
||
|
|
new = (srtp_kernel_debug_module_t*)srtp_crypto_alloc(sizeof(srtp_kernel_debug_module_t));
|
||
|
|
if (new == NULL) {
|
||
|
|
return srtp_err_status_alloc_fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* set fields */
|
||
|
|
new->mod = new_dm;
|
||
|
|
new->next = crypto_kernel.debug_module_list;
|
||
|
|
|
||
|
|
/* set head of list to new cipher type */
|
||
|
|
crypto_kernel.debug_module_list = new;
|
||
|
|
|
||
|
|
return srtp_err_status_ok;
|
||
|
|
}
|
||
|
|
|
||
|
|
srtp_err_status_t srtp_crypto_kernel_set_debug_module (const char *name, int on)
|
||
|
|
{
|
||
|
|
srtp_kernel_debug_module_t *kdm;
|
||
|
|
|
||
|
|
/* walk down list, checking if this type is in the list already */
|
||
|
|
kdm = crypto_kernel.debug_module_list;
|
||
|
|
while (kdm != NULL) {
|
||
|
|
if (strncmp(name, kdm->mod->name, 64) == 0) {
|
||
|
|
kdm->mod->on = on;
|
||
|
|
return srtp_err_status_ok;
|
||
|
|
}
|
||
|
|
kdm = kdm->next;
|
||
|
|
}
|
||
|
|
|
||
|
|
return srtp_err_status_fail;
|
||
|
|
}
|