Magisk/activity.c
2017-02-01 05:59:48 +08:00

201 lines
5.1 KiB
C

/*
** Copyright 2017, John Wu (@topjohnwu)
** Copyright 2010, Adam Shanks (@ChainsDD)
** Copyright 2008, Zinx Verituse (@zinxv)
**
** 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 <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>
#include <paths.h>
#include <stdio.h>
#include <stdarg.h>
#include "su.h"
/* intent actions */
#define ACTION_REQUEST "start", "-n", REQUESTOR "/" REQUESTOR_PREFIX ".RequestActivity"
#define ACTION_NOTIFY "start", "-n", REQUESTOR "/" REQUESTOR_PREFIX ".NotifyActivity"
#define ACTION_RESULT "broadcast", "-n", REQUESTOR "/" REQUESTOR_PREFIX ".SuReceiver"
#define AM_PATH "/system/bin/app_process", "/system/bin", "com.android.commands.am.Am"
// TODO: leverage this with exec_log?
int silent_run(char* const args[]) {
set_identity(0);
pid_t pid;
pid = fork();
/* Parent */
if (pid < 0) {
PLOGE("fork");
return -1;
}
else if (pid > 0) {
return 0;
}
int zero = open("/dev/zero", O_RDONLY | O_CLOEXEC);
dup2(zero, 0);
int null = open("/dev/null", O_WRONLY | O_CLOEXEC);
dup2(null, 1);
dup2(null, 2);
setenv("CLASSPATH", "/system/framework/am.jar", 1);
execv(args[0], args);
PLOGE("exec am");
_exit(EXIT_FAILURE);
return -1;
}
int get_owner_login_user_args(struct su_context *ctx, char* user, int user_len) {
int needs_owner_login_prompt = 0;
if (ctx->user.multiuser_mode == MULTIUSER_MODE_OWNER_MANAGED) {
if (0 != ctx->user.android_user_id) {
needs_owner_login_prompt = 1;
}
snprintf(user, user_len, "0");
}
else if (ctx->user.multiuser_mode == MULTIUSER_MODE_USER) {
snprintf(user, user_len, "%d", ctx->user.android_user_id);
}
else if (ctx->user.multiuser_mode == MULTIUSER_MODE_NONE) {
user[0] = '\0';
}
else {
snprintf(user, user_len, "0");
}
return needs_owner_login_prompt;
}
int send_result(struct su_context *ctx, policy_t policy) {
char binary_version[256];
sprintf(binary_version, "%d", VERSION_CODE);
char uid[256];
sprintf(uid, "%d", ctx->from.uid);
char toUid[256];
sprintf(toUid, "%d", ctx->to.uid);
char pid[256];
sprintf(pid, "%d", ctx->from.pid);
char user[64];
get_owner_login_user_args(ctx, user, sizeof(user));
if (0 != ctx->user.android_user_id) {
char android_user_id[256];
sprintf(android_user_id, "%d", ctx->user.android_user_id);
char *user_result_command[] = {
AM_PATH,
ACTION_RESULT,
"--ei",
"from.uid",
uid,
"--ei",
"to.uid",
toUid,
"--ei",
"pid",
pid,
"--es",
"command",
get_command(&ctx->to),
"--es",
"action",
policy == ALLOW ? "allow" : "deny",
user[0] ? "--user" : NULL,
android_user_id,
NULL
};
silent_run(user_result_command);
}
char *result_command[] = {
AM_PATH,
ACTION_RESULT,
"--ei",
"from.uid",
uid,
"--ei",
"to.uid",
toUid,
"--ei",
"pid",
pid,
"--es",
"command",
get_command(&ctx->to),
"--es",
"action",
policy == ALLOW ? "allow" : "deny",
user[0] ? "--user" : NULL,
user,
NULL
};
return silent_run(result_command);
}
int send_request(struct su_context *ctx) {
// if su is operating in MULTIUSER_MODEL_OWNER,
// and the user requestor is not the owner,
// the owner needs to be notified of the request.
// so there will be two activities shown.
char user[64];
int needs_owner_login_prompt = get_owner_login_user_args(ctx, user, sizeof(user));
int ret;
if (needs_owner_login_prompt) {
char uid[256];
sprintf(uid, "%d", ctx->from.uid);
char android_user_id[256];
sprintf(android_user_id, "%d", ctx->user.android_user_id);
// in multiuser mode, the owner gets the su prompt
char *notify_command[] = {
AM_PATH,
ACTION_NOTIFY,
"--ei",
"caller_uid",
uid,
"--user",
android_user_id,
NULL
};
int ret = silent_run(notify_command);
if (ret) {
return ret;
}
}
char *request_command[] = {
AM_PATH,
ACTION_REQUEST,
"--es",
"socket",
ctx->sock_path,
user[0] ? "--user" : NULL,
user,
NULL
};
return silent_run(request_command);
}