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be-mongo.c
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be-mongo.c
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/*
* Original Work:
* Copyright (c) 2014 zhangxj <[email protected]>
* Modified and Adapted for Mosquitto_auth_plug by:
* Gopalakrishna Palem < http://gk.palem.in/ >
*/
#ifdef BE_MONGO
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <mosquitto.h>
#include <mongoc.h>
#include "hash.h"
#include "log.h"
#include "backends.h"
struct mongo_backend {
mongoc_client_t *client;
char *database;
char *user_coll;
char *topiclist_coll;
char *user_username_prop;
char *user_password_prop;
char *user_superuser_prop;
char *user_topics_prop;
char *user_topiclist_fk_prop;
char *topiclist_key_prop;
char *topiclist_topics_prop;
};
const char *be_mongo_get_option(const char *opt_name, const char *dep_opt_name, const char *default_val);
mongoc_uri_t *be_mongo_new_uri_from_options();
bool be_mongo_check_acl_topics_array(const bson_iter_t *topics, const char *req_topic, const char *clientid, const char *username);
bool be_mongo_check_acl_topics_map(const bson_iter_t *topics, const char *req_topic, int req_access, const char *clientid, const char *username);
void *be_mongo_init()
{
struct mongo_backend *conf;
conf = (struct mongo_backend *)malloc(sizeof(struct mongo_backend));
conf->database = strdup(be_mongo_get_option("mongo_database", NULL, "mqGate"));
conf->user_coll = strdup(be_mongo_get_option("mongo_user_coll", "mongo_collection_users", "users"));
conf->topiclist_coll = strdup(be_mongo_get_option("mongo_topiclist_coll", "mongo_collection_topics", "topics"));
conf->user_username_prop = strdup(be_mongo_get_option("mongo_user_username_prop", NULL, "username"));
conf->user_password_prop = strdup(be_mongo_get_option("mongo_user_password_prop", "mongo_location_password", "password"));
conf->user_superuser_prop = strdup(be_mongo_get_option("mongo_user_superuser_prop", "mongo_location_superuser", "superuser"));
conf->user_topics_prop = strdup(be_mongo_get_option("mongo_user_topics_prop", NULL, "topics"));
conf->user_topiclist_fk_prop = strdup(be_mongo_get_option("mongo_user_topiclist_fk_prop", "mongo_location_topic", "topics"));
conf->topiclist_key_prop = strdup(be_mongo_get_option("mongo_topiclist_key_prop", "mongo_location_superuser", "_id"));
conf->topiclist_topics_prop = strdup(be_mongo_get_option("mongo_topiclist_topics_prop", "mongo_location_topic", "topics"));
mongoc_init();
mongoc_uri_t *uri = be_mongo_new_uri_from_options();
if (!uri) {
_fatal("MongoDB connection options invalid");
}
conf->client = mongoc_client_new_from_uri(uri);
mongoc_uri_destroy(uri);
return (conf);
}
// Get an option value via p_stab, fallback to a deprecated option (log a warning if present), fallback to a default
const char *be_mongo_get_option(const char *opt_name, const char *dep_opt_name, const char *default_val) {
const char *value;
if ((value = p_stab(opt_name)) == NULL) {
if (dep_opt_name == NULL || (value = p_stab(dep_opt_name)) == NULL) {
value = default_val;
} else {
_log(LOG_NOTICE, "[mongo] Warning: Option '%s' is deprecated. Use '%s' instead.", opt_name, dep_opt_name);
}
}
return value;
}
// Return a new mongoc_uri_t which should be freed with mongoc_uri_destroy
mongoc_uri_t *be_mongo_new_uri_from_options() {
const char *uristr = p_stab("mongo_uri");
const char *host = p_stab("mongo_host");
const char *port = p_stab("mongo_port");
const char *user = p_stab("mongo_user");
const char *password = p_stab("mongo_password");
const char *authSource = p_stab("mongo_authSource");
mongoc_uri_t *uri;
if (uristr) {
// URI string trumps everything else. Let the driver parse it.
uri = mongoc_uri_new(uristr);
} else if (host || port || user || password || authSource) {
// Using legacy piecemeal connection options. Assemble the URI.
uri = mongoc_uri_new_for_host_port(
host ? host : "localhost",
(port && atoi(port)) ? atoi(port) : 27017
);
// NB: Option setters require mongo-c-driver >= 1.4.0 (Aug 2016)
if (user != NULL) {
mongoc_uri_set_username(uri, user);
if (password != NULL) {
mongoc_uri_set_password(uri, password);
}
}
if (authSource != NULL) {
mongoc_uri_set_auth_source(uri, authSource);
}
} else {
// No connection options given at all, use defaults.
uri = mongoc_uri_new_for_host_port("localhost", 27017);
}
return uri;
}
int be_mongo_getuser(void *handle, const char *username, const char *password, char **phash, const char *clientid)
{
struct mongo_backend *conf = (struct mongo_backend *)handle;
mongoc_collection_t *collection;
mongoc_cursor_t *cursor;
bson_error_t error;
const bson_t *doc;
bson_iter_t iter;
bson_t query;
char *result = NULL;
bson_init (&query);
bson_append_utf8 (&query, conf->user_username_prop, -1, username, -1);
collection = mongoc_client_get_collection (conf->client, conf->database, conf->user_coll);
cursor = mongoc_collection_find_with_opts(collection, &query, NULL, NULL);
if (!mongoc_cursor_error (cursor, &error) &&
mongoc_cursor_next (cursor, &doc)) {
bson_iter_init(&iter, doc);
if (bson_iter_find(&iter, conf->user_password_prop)) {
const char *password_src = bson_iter_utf8(&iter, NULL);
size_t password_len = strlen(password_src) + 1;
result = (char *) malloc(password_len);
memcpy(result, password_src, password_len);
} else {
_log(LOG_NOTICE, "[mongo] (%s) missing for user (%s)", conf->user_password_prop, username);
}
}
if (mongoc_cursor_error (cursor, &error)) {
fprintf (stderr, "Cursor Failure: %s\n", error.message);
}
bson_destroy (&query);
mongoc_cursor_destroy (cursor);
mongoc_collection_destroy (collection);
*phash = result;
return BACKEND_DEFER;
}
void be_mongo_destroy(void *handle)
{
struct mongo_backend *conf = (struct mongo_backend *)handle;
if (conf != NULL) {
/* Free Settings */
free(conf->database);
free(conf->user_coll);
free(conf->topiclist_coll);
free(conf->user_username_prop);
free(conf->user_password_prop);
free(conf->user_superuser_prop);
free(conf->user_topics_prop);
free(conf->user_topiclist_fk_prop);
free(conf->topiclist_key_prop);
free(conf->topiclist_topics_prop);
mongoc_client_destroy(conf->client);
conf->client = NULL;
free(conf);
}
}
int be_mongo_superuser(void *conf, const char *username)
{
struct mongo_backend *handle = (struct mongo_backend *) conf;
mongoc_collection_t *collection;
mongoc_cursor_t *cursor;
bson_error_t error;
const bson_t *doc;
int result = 0;
bson_t query;
bson_iter_t iter;
bson_init (&query);
bson_append_utf8(&query, handle->user_username_prop, -1, username, -1);
collection = mongoc_client_get_collection(handle->client, handle->database, handle->user_coll);
cursor = mongoc_collection_find_with_opts(collection, &query, NULL, NULL);
if (!mongoc_cursor_error (cursor, &error) &&
mongoc_cursor_next (cursor, &doc)) {
bson_iter_init(&iter, doc);
if (bson_iter_find(&iter, handle->user_superuser_prop)) {
result = bson_iter_as_bool(&iter) ? 1 : 0;
}
}
if (mongoc_cursor_error (cursor, &error)) {
fprintf(stderr, "Cursor Failure: %s\n", error.message);
}
bson_destroy (&query);
mongoc_cursor_destroy (cursor);
mongoc_collection_destroy (collection);
return (result) ? BACKEND_ALLOW : BACKEND_DEFER;
}
int be_mongo_aclcheck(void *conf, const char *clientid, const char *username, const char *topic, int acc)
{
struct mongo_backend *handle = (struct mongo_backend *) conf;
mongoc_collection_t *collection;
mongoc_cursor_t *cursor;
bson_error_t error;
const bson_t *doc;
bson_iter_t iter;
int match = 0;
const bson_oid_t *topic_lookup_oid = NULL;
const char *topic_lookup_utf8 = NULL;
int64_t topic_lookup_int64 = 0;
bson_t query;
bson_init(&query);
bson_append_utf8(&query, handle->user_username_prop, -1, username, -1);
collection = mongoc_client_get_collection(handle->client, handle->database, handle->user_coll);
cursor = mongoc_collection_find_with_opts(collection, &query, NULL, NULL);
if (!mongoc_cursor_error (cursor, &error) && mongoc_cursor_next (cursor, &doc)) {
// First find any user[handle->user_topiclist_fk_prop]
if (bson_iter_init_find(&iter, doc, handle->user_topiclist_fk_prop)) {
bson_type_t loc_id_type = bson_iter_type(&iter);
if (loc_id_type == BSON_TYPE_OID) {
topic_lookup_oid = bson_iter_oid(&iter);
} else if (loc_id_type == BSON_TYPE_INT32 || loc_id_type == BSON_TYPE_INT64) {
topic_lookup_int64 = bson_iter_as_int64(&iter);
} else if (loc_id_type == BSON_TYPE_UTF8) {
topic_lookup_utf8 = bson_iter_utf8(&iter, NULL);
}
}
// Look through the props from the beginning for user[handle->user_topics_prop]
if (bson_iter_init_find(&iter, doc, handle->user_topics_prop)) {
bson_type_t embedded_prop_type = bson_iter_type(&iter);
if (embedded_prop_type == BSON_TYPE_ARRAY) {
match = be_mongo_check_acl_topics_array(&iter, topic, clientid, username);
} else if (embedded_prop_type == BSON_TYPE_DOCUMENT) {
match = be_mongo_check_acl_topics_map(&iter, topic, acc, clientid, username);
}
}
}
if ((mongoc_cursor_error (cursor, &error)) && (match != 1)) {
fprintf (stderr, "Cursor Failure: %s\n", error.message);
}
bson_destroy(&query);
mongoc_cursor_destroy (cursor);
mongoc_collection_destroy(collection);
if (!match && (topic_lookup_oid != NULL || topic_lookup_int64 != 0 || topic_lookup_utf8 != NULL)) {
bson_init(&query);
if (topic_lookup_oid != NULL) {
bson_append_oid(&query, handle->topiclist_key_prop, -1, topic_lookup_oid);
} else if (topic_lookup_int64 != 0) {
bson_append_int64(&query, handle->topiclist_key_prop, -1, topic_lookup_int64);
} else if (topic_lookup_utf8 != NULL) {
bson_append_utf8(&query, handle->topiclist_key_prop, -1, topic_lookup_utf8, -1);
}
collection = mongoc_client_get_collection(handle->client, handle->database, handle->topiclist_coll);
cursor = mongoc_collection_find_with_opts(collection, &query, NULL, NULL);
if (!mongoc_cursor_error (cursor, &error) && mongoc_cursor_next(cursor, &doc)) {
bson_iter_init(&iter, doc);
if (bson_iter_find(&iter, handle->topiclist_topics_prop)) {
bson_type_t loc_prop_type = bson_iter_type(&iter);
if (loc_prop_type == BSON_TYPE_ARRAY) {
match = be_mongo_check_acl_topics_array(&iter, topic, clientid, username);
} else if (loc_prop_type == BSON_TYPE_DOCUMENT) {
match = be_mongo_check_acl_topics_map(&iter, topic, acc, clientid, username);
}
} else {
_log(LOG_NOTICE, "[mongo] ACL check error - no topic list found for user (%s) in collection (%s)", username, handle->topiclist_coll);
}
}
if ((mongoc_cursor_error (cursor, &error)) && (match != 1)) {
fprintf (stderr, "Cursor Failure: %s\n", error.message);
}
bson_destroy(&query);
mongoc_cursor_destroy(cursor);
mongoc_collection_destroy(collection);
}
return (match) ? BACKEND_ALLOW : BACKEND_DEFER;
}
// Check an embedded array of the form [ "public/#", "private/myid/#" ]
bool be_mongo_check_acl_topics_array(const bson_iter_t *topics, const char *req_topic, const char *clientid, const char *username)
{
bson_iter_t iter;
bson_iter_recurse(topics, &iter);
while (bson_iter_next(&iter)) {
const char *permitted_topic = bson_iter_utf8(&iter, NULL);
bool topic_matches = false;
char *expanded;
t_expand(clientid, username, permitted_topic, &expanded);
if (expanded && *expanded) {
mosquitto_topic_matches_sub(expanded, req_topic, &topic_matches);
free(expanded);
if (topic_matches) {
return true;
}
}
}
return false;
}
// Check an embedded document of the form { "article/#": "r", "article/+/comments": "rw", "ballotbox": "w" }
bool be_mongo_check_acl_topics_map(const bson_iter_t *topics, const char *req_topic, int req_access, const char *clientid, const char *username)
{
bson_iter_t iter;
bson_iter_recurse(topics, &iter);
bool granted = false;
// Loop through mapped topics, allowing for the fact that a two different ACLs may have complementary permissions.
while (bson_iter_next(&iter) && !granted) {
const char *permitted_topic = bson_iter_key(&iter);
bool topic_matches = false;
char *expanded;
t_expand(clientid, username, permitted_topic, &expanded);
if (expanded && *expanded) {
mosquitto_topic_matches_sub(expanded, req_topic, &topic_matches);
free(expanded);
if (topic_matches) {
bson_type_t val_type = bson_iter_type(&iter);
if (val_type == BSON_TYPE_UTF8) {
// NOTE: can req_access be any other value than 1 or 2?
// in that case this may not be correct:
// e.g. req_access == 3 (rw) -> granted = (3 & 1 > 0) == true
const char *permission = bson_iter_utf8(&iter, NULL);
if (strcmp(permission, "r") == 0) {
granted = (req_access & 1) > 0;
} else if (strcmp(permission, "w") == 0) {
granted = (req_access & 2) > 0;
} else if (strcmp(permission, "rw") == 0) {
granted = true;
}
}
}
}
}
return granted;
}
#endif /* BE_MONGO */