Magisk/db.c

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/*
** Copyright 2013, Koushik Dutta (@koush)
**
** Licensed 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.
*/
#include <stdlib.h>
#include <stdio.h>
#include <limits.h>
#include <sqlite3.h>
#include <time.h>
#include "su.h"
struct callback_data_t {
struct su_context *ctx;
policy_t policy;
};
static int database_callback(void *v, int argc, char **argv, char **azColName){
struct callback_data_t *data = (struct callback_data_t *)v;
int command_match = 0;
policy_t policy = DENY;
int i;
time_t until = 0;
for(i = 0; i < argc; i++) {
if (strcmp(azColName[i], "policy") == 0) {
if (argv[i] == NULL) {
policy = DENY;
}
if (strcmp(argv[i], "allow") == 0) {
policy = ALLOW;
}
else if (strcmp(argv[i], "interactive") == 0) {
policy = INTERACTIVE;
}
else {
policy = DENY;
}
}
else if (strcmp(azColName[i], "command") == 0) {
// null or empty command means to match all commands (whitelist all from uid)
command_match = argv[i] == NULL || strlen(argv[i]) == 0 || strcmp(argv[i], get_command(&(data->ctx->to))) == 0;
}
else if (strcmp(azColName[i], "until") == 0) {
if (argv[i] != NULL) {
until = atoi(argv[i]);
}
}
}
// check for command match
if (command_match) {
// also make sure this policy has not expired
if (until == 0 || until > time(NULL)) {
if (policy == DENY) {
data->policy = DENY;
return -1;
}
data->policy = ALLOW;
// even though we allow, continue, so we can see if there's another policy
// that denies...
}
}
return 0;
}
policy_t database_check(struct su_context *ctx) {
sqlite3 *db = NULL;
char query[512];
snprintf(query, sizeof(query), "select policy, until, command from uid_policy where uid=%d", ctx->from.uid);
int ret = sqlite3_open_v2(ctx->user.database_path, &db, SQLITE_OPEN_READONLY, NULL);
if (ret) {
LOGE("sqlite3 open failure: %d", ret);
sqlite3_close(db);
return INTERACTIVE;
}
int result;
char *err = NULL;
struct callback_data_t data;
data.ctx = ctx;
data.policy = INTERACTIVE;
ret = sqlite3_exec(db, query, database_callback, &data, &err);
sqlite3_close(db);
if (err != NULL) {
LOGE("sqlite3_exec: %s", err);
return DENY;
}
return data.policy;
}