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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/***************************************************************************
* Copyright (C) 2013-2014 Ping Identity Corporation
* All rights reserved.
*
* For further information please contact:
*
* Ping Identity Corporation
* 1099 18th St Suite 2950
* Denver, CO 80202
* 303.468.2900
* http://www.pingidentity.com
*
* DISCLAIMER OF WARRANTIES:
*
* THE SOFTWARE PROVIDED HEREUNDER IS PROVIDED ON AN "AS IS" BASIS, WITHOUT
* ANY WARRANTIES OR REPRESENTATIONS EXPRESS, IMPLIED OR STATUTORY; INCLUDING,
* WITHOUT LIMITATION, WARRANTIES OF QUALITY, PERFORMANCE, NONINFRINGEMENT,
* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. NOR ARE THERE ANY
* WARRANTIES CREATED BY A COURSE OR DEALING, COURSE OF PERFORMANCE OR TRADE
* USAGE. FURTHERMORE, THERE ARE NO WARRANTIES THAT THE SOFTWARE WILL MEET
* YOUR NEEDS OR BE FREE FROM ERRORS, OR THAT THE OPERATION OF THE SOFTWARE
* WILL BE UNINTERRUPTED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES 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.
*
* based on http://saju.net.in/code/misc/openssl_aes.c.txt
*
* @Author: Hans Zandbelt - hzandbelt@pingidentity.com
*/
#include <httpd.h>
#include <http_config.h>
#include <http_log.h>
#include <http_request.h>
#include <openssl/evp.h>
#include <openssl/aes.h>
#include <openssl/rsa.h>
#include <openssl/hmac.h>
#include <openssl/err.h>
#include "mod_auth_openidc.h"
/*
* initialize the crypto context in the server configuration record; the passphrase is set already
*/
static apr_byte_t oidc_crypto_init(oidc_cfg *cfg, server_rec *s) {
if (cfg->encrypt_ctx != NULL)
return TRUE;
unsigned char *key_data = (unsigned char *) cfg->crypto_passphrase;
int key_data_len = strlen(cfg->crypto_passphrase);
unsigned int s_salt[] = { 41892, 72930 };
unsigned char *salt = (unsigned char *) &s_salt;
int i, nrounds = 5;
unsigned char key[32], iv[32];
/*
* Gen key & IV for AES 256 CBC mode. A SHA1 digest is used to hash the supplied key material.
* nrounds is the number of times the we hash the material. More rounds are more secure but
* slower.
*/
i = EVP_BytesToKey(EVP_aes_256_cbc(), EVP_sha1(), salt, key_data,
key_data_len, nrounds, key, iv);
if (i != 32) {
oidc_serror(s, "key size must be 256 bits!");
return FALSE;
}
cfg->encrypt_ctx = apr_palloc(s->process->pool, sizeof(EVP_CIPHER_CTX));
cfg->decrypt_ctx = apr_palloc(s->process->pool, sizeof(EVP_CIPHER_CTX));
/* initialize the encoding context */
EVP_CIPHER_CTX_init(cfg->encrypt_ctx);
if (!EVP_EncryptInit_ex(cfg->encrypt_ctx, EVP_aes_256_cbc(), NULL, key,
iv)) {
oidc_serror(s, "EVP_EncryptInit_ex on the encrypt context failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return FALSE;
}
/* initialize the decoding context */
EVP_CIPHER_CTX_init(cfg->decrypt_ctx);
if (!EVP_DecryptInit_ex(cfg->decrypt_ctx, EVP_aes_256_cbc(), NULL, key,
iv)) {
oidc_serror(s, "EVP_DecryptInit_ex on the decrypt context failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return FALSE;
}
return TRUE;
}
/*
* AES encrypt plaintext
*/
unsigned char *oidc_crypto_aes_encrypt(request_rec *r, oidc_cfg *cfg,
unsigned char *plaintext, int *len) {
if (oidc_crypto_init(cfg, r->server) == FALSE)
return NULL;
/* max ciphertext len for a n bytes of plaintext is n + AES_BLOCK_SIZE -1 bytes */
int c_len = *len + AES_BLOCK_SIZE, f_len = 0;
unsigned char *ciphertext = apr_palloc(r->pool, c_len);
/* allows reusing of 'e' for multiple encryption cycles */
if (!EVP_EncryptInit_ex(cfg->encrypt_ctx, NULL, NULL, NULL, NULL)) {
oidc_error(r, "EVP_EncryptInit_ex failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return NULL;
}
/* update ciphertext, c_len is filled with the length of ciphertext generated, len is the size of plaintext in bytes */
if (!EVP_EncryptUpdate(cfg->encrypt_ctx, ciphertext, &c_len, plaintext,
*len)) {
oidc_error(r, "EVP_EncryptUpdate failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return NULL;
}
/* update ciphertext with the final remaining bytes */
if (!EVP_EncryptFinal_ex(cfg->encrypt_ctx, ciphertext + c_len, &f_len)) {
oidc_error(r, "EVP_EncryptFinal_ex failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return NULL;
}
*len = c_len + f_len;
return ciphertext;
}
/*
* AES decrypt ciphertext
*/
unsigned char *oidc_crypto_aes_decrypt(request_rec *r, oidc_cfg *cfg,
unsigned char *ciphertext, int *len) {
if (oidc_crypto_init(cfg, r->server) == FALSE)
return NULL;
/* because we have padding ON, we must allocate an extra cipher block size of memory */
int p_len = *len, f_len = 0;
unsigned char *plaintext = apr_palloc(r->pool, p_len + AES_BLOCK_SIZE);
/* allows reusing of 'e' for multiple encryption cycles */
if (!EVP_DecryptInit_ex(cfg->decrypt_ctx, NULL, NULL, NULL, NULL)) {
oidc_error(r, "EVP_DecryptInit_ex failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return NULL;
}
/* update plaintext, p_len is filled with the length of plaintext generated, len is the size of ciphertext in bytes */
if (!EVP_DecryptUpdate(cfg->decrypt_ctx, plaintext, &p_len, ciphertext,
*len)) {
oidc_error(r, "EVP_DecryptUpdate failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return NULL;
}
/* update plaintext with the final remaining bytes */
if (!EVP_DecryptFinal_ex(cfg->decrypt_ctx, plaintext + p_len, &f_len)) {
oidc_error(r, "EVP_DecryptFinal_ex failed: %s",
ERR_error_string(ERR_get_error(), NULL));
return NULL;
}
*len = p_len + f_len;
return plaintext;
}
/*
* cleanup the crypto context in the server configuration record
*/
apr_byte_t oidc_crypto_destroy(oidc_cfg *cfg, server_rec *s) {
if (cfg->encrypt_ctx == NULL)
return TRUE;
EVP_CIPHER_CTX_cleanup(cfg->encrypt_ctx);
EVP_CIPHER_CTX_cleanup(cfg->decrypt_ctx);
cfg->encrypt_ctx = NULL;
cfg->decrypt_ctx = NULL;
return TRUE;
}
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