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cache.c
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cache.c
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/*
* Copyright (c) 2014 Jan-Piet Mens <jpmens()gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of mosquitto nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) 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.
*/
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <time.h>
#include <mosquitto.h>
#include "userdata.h"
#include "cache.h"
#include <openssl/evp.h>
#include <openssl/sha.h>
#include "uthash.h"
static unsigned int sha_hash(const char *data, size_t size, unsigned char *out)
{
unsigned int md_len = -1;
const EVP_MD *md = EVP_get_digestbyname("SHA1");
if (md != NULL) {
EVP_MD_CTX mdctx;
EVP_MD_CTX_init(&mdctx);
EVP_DigestInit_ex(&mdctx, md, NULL);
EVP_DigestUpdate(&mdctx, data, size);
EVP_DigestFinal_ex(&mdctx, out, &md_len);
EVP_MD_CTX_cleanup(&mdctx);
}
return md_len;
}
static void hexify(const char *clientid, const char *username, const char *topic, int access, char *hex)
{
char *data;
unsigned char hashdata[SHA_DIGEST_LENGTH];
int mdlen, i;
data = malloc(strlen(clientid) + strlen(username) + strlen(topic) + 20);
sprintf(data, "%s:%s:%s:%d", clientid, username, topic, access);
mdlen = sha_hash(data, strlen(data), hashdata);
if (mdlen != SHA_DIGEST_LENGTH) {
free(data);
return;
}
// printf("mdlen=%d, string=%s\n\thash=", mdlen, data);
for (i = 0, *hex = 0; i < sizeof(hashdata) / sizeof(hashdata[0]); i++) {
sprintf(hex + (i*2), "%02X", hashdata[i]);
}
// printf("%s\n", hex);
free(data);
}
/* access is desired read/write access
* granted is what Mosquitto auth-plug actually granted
*/
void acl_cache(const char *clientid, const char *username, const char *topic, int access, int granted, void *userdata)
{
char hex[SHA_DIGEST_LENGTH * 2 + 1];
struct aclcache *a;
struct userdata *ud = (struct userdata *)userdata;
time_t cachetics = ud->cachetics;
hexify(clientid, username, topic, access, hex);
HASH_FIND_STR(ud->aclcache, hex, a);
if (a) {
granted = a->granted;
if (time(NULL) > (a->tics + cachetics)) {
printf("EXPIRED!!!!!!!!!!!!!\n");
HASH_DEL(ud->aclcache, a);
}
} else {
a = (struct aclcache *)malloc(sizeof(struct aclcache));
strcpy(a->hex, hex);
a->granted = granted;
a->tics = time(NULL);
HASH_ADD_STR(ud->aclcache, hex, a);
}
}
int cache_q(const char *clientid, const char *username, const char *topic, int access, void *userdata)
{
char hex[SHA_DIGEST_LENGTH * 2 + 1];
struct aclcache *a;
struct userdata *ud = (struct userdata *)userdata;
time_t cachetics = ud->cachetics;
int granted = MOSQ_ERR_UNKNOWN;
hexify(clientid, username, topic, access, hex);
HASH_FIND_STR(ud->aclcache, hex, a);
if (a) {
// printf("---> CACHED! %d\n", a->granted);
granted = a->granted;
if (time(NULL) > (a->tics + cachetics)) {
printf("EXPIRED!!!!!!!!!!!!!\n");
HASH_DEL(ud->aclcache, a);
}
}
return (granted);
}