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/*
* Copyright (C) 2015 The Android Open Source Project
*
* 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 <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <fs_mgr.h>
#include <stdio.h>
#include <string.h>
#include <stdint.h>
#include <inttypes.h>
#include <algorithm>
#include <thread>
#define LOG_TAG "VoldCryptCmdListener"
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <cutils/fs.h>
#include <cutils/log.h>
#include <cutils/sockets.h>
#include <sysutils/SocketClient.h>
#include <private/android_filesystem_config.h>
#include "CryptCommandListener.h"
#include "Process.h"
#include "ResponseCode.h"
#include "cryptfs.h"
#include "Ext4Crypt.h"
#include "Utils.h"
#define DUMP_ARGS 0
CryptCommandListener::CryptCommandListener() :
FrameworkListener("cryptd", true) {
registerCmd(new CryptfsCmd());
}
#if DUMP_ARGS
void CryptCommandListener::dumpArgs(int argc, char **argv, int argObscure) {
char buffer[4096];
char *p = buffer;
memset(buffer, 0, sizeof(buffer));
int i;
for (i = 0; i < argc; i++) {
unsigned int len = strlen(argv[i]) + 1; // Account for space
if (i == argObscure) {
len += 2; // Account for {}
}
if (((p - buffer) + len) < (sizeof(buffer)-1)) {
if (i == argObscure) {
*p++ = '{';
*p++ = '}';
*p++ = ' ';
continue;
}
strcpy(p, argv[i]);
p+= strlen(argv[i]);
if (i != (argc -1)) {
*p++ = ' ';
}
}
}
SLOGD("%s", buffer);
}
#else
void CryptCommandListener::dumpArgs(int /*argc*/, char ** /*argv*/, int /*argObscure*/) { }
#endif
int CryptCommandListener::sendGenericOkFailOnBool(SocketClient *cli, bool success) {
if (success) {
return cli->sendMsg(ResponseCode::CommandOkay, "Command succeeded", false);
} else {
return cli->sendMsg(ResponseCode::OperationFailed, "Command failed", false);
}
}
CryptCommandListener::CryptfsCmd::CryptfsCmd() :
VoldCommand("cryptfs") {
}
static int getType(const char* type)
{
if (!strcmp(type, "default")) {
return CRYPT_TYPE_DEFAULT;
} else if (!strcmp(type, "password")) {
return CRYPT_TYPE_PASSWORD;
} else if (!strcmp(type, "pin")) {
return CRYPT_TYPE_PIN;
} else if (!strcmp(type, "pattern")) {
return CRYPT_TYPE_PATTERN;
} else {
return -1;
}
}
static char* parseNull(char* arg) {
if (strcmp(arg, "!") == 0) {
return nullptr;
} else {
return arg;
}
}
static bool check_argc(SocketClient *cli, const std::string &subcommand, int argc,
int expected, std::string usage) {
assert(expected >= 2);
if (expected == 2) {
assert(usage.empty());
} else {
assert(!usage.empty());
assert(std::count(usage.begin(), usage.end(), ' ') + 3 == expected);
}
if (argc == expected) {
return true;
}
auto message = std::string() + "Usage: cryptfs " + subcommand;
if (!usage.empty()) {
message += " " + usage;
}
cli->sendMsg(ResponseCode::CommandSyntaxError, message.c_str(), false);
return false;
}
static int do_enablecrypto(char* arg2, char* arg4, int type, bool no_ui) {
int rc;
int tries;
for (tries = 0; tries < 2; ++tries) {
if (type == CRYPT_TYPE_DEFAULT) {
rc = cryptfs_enable_default(arg2, no_ui);
} else {
rc = cryptfs_enable(arg2, type, arg4, no_ui);
}
if (rc == 0) {
free(arg2);
free(arg4);
return 0;
} else if (tries == 0) {
Process::killProcessesWithOpenFiles(DATA_MNT_POINT, SIGKILL);
}
}
free(arg2);
free(arg4);
return -1;
}
int CryptCommandListener::CryptfsCmd::runCommand(SocketClient *cli,
int argc, char **argv) {
if ((cli->getUid() != 0) && (cli->getUid() != AID_SYSTEM)) {
cli->sendMsg(ResponseCode::CommandNoPermission, "No permission to run cryptfs commands", false);
return 0;
}
if (argc < 2) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Missing subcommand", false);
return 0;
}
int rc = 0;
std::string subcommand(argv[1]);
if (subcommand == "checkpw") {
if (!check_argc(cli, subcommand, argc, 3, "<passwd>")) return 0;
dumpArgs(argc, argv, 2);
rc = cryptfs_check_passwd(argv[2]);
} else if (subcommand == "restart") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
dumpArgs(argc, argv, -1);
// Spawn as thread so init can issue commands back to vold without
// causing deadlock, usually as a result of prep_data_fs.
std::thread(&cryptfs_restart).detach();
} else if (subcommand == "cryptocomplete") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
dumpArgs(argc, argv, -1);
rc = cryptfs_crypto_complete();
} else if (subcommand == "enablecrypto") {
const char* syntax = "Usage: cryptfs enablecrypto <wipe|inplace> "
"default|password|pin|pattern [passwd] [noui]";
// This should be replaced with a command line parser if more options
// are added
bool valid = true;
bool no_ui = false;
int type = CRYPT_TYPE_DEFAULT;
int options = 4; // Optional parameters are at this offset
if (argc < 4) {
// Minimum 4 parameters
valid = false;
} else if (strcmp(argv[2], "wipe") && strcmp(argv[2], "inplace") ) {
// Second parameter must be wipe or inplace
valid = false;
} else {
// Third parameter must be valid type
type = getType(argv[3]);
if (type == -1) {
valid = false;
} else if (type != CRYPT_TYPE_DEFAULT) {
options++;
}
}
if (valid) {
if(argc < options) {
// Too few parameters
valid = false;
} else if (argc == options) {
// No more, done
} else if (argc == options + 1) {
// One option, must be noui
if (!strcmp(argv[options], "noui")) {
no_ui = true;
} else {
valid = false;
}
} else {
// Too many options
valid = false;
}
}
if (!valid) {
cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false);
return 0;
}
dumpArgs(argc, argv, 4);
// Spawn as thread so init can issue commands back to vold without
// causing deadlock, usually as a result of prep_data_fs.
char* arg2 = argc > 2 ? strdup(argv[2]) : NULL;
char* arg4 = argc > 4 ? strdup(argv[4]) : NULL;
std::thread(&do_enablecrypto, arg2, arg4, type, no_ui).detach();
} else if (subcommand == "enablefilecrypto") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
dumpArgs(argc, argv, -1);
rc = cryptfs_enable_file();
} else if (subcommand == "changepw") {
const char* syntax = "Usage: cryptfs changepw "
"default|password|pin|pattern [newpasswd]";
const char* password;
if (argc == 3) {
password = "";
} else if (argc == 4) {
password = argv[3];
} else {
cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false);
return 0;
}
int type = getType(argv[2]);
if (type == -1) {
cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false);
return 0;
}
SLOGD("cryptfs changepw %s {}", argv[2]);
rc = cryptfs_changepw(type, password);
} else if (subcommand == "verifypw") {
if (!check_argc(cli, subcommand, argc, 3, "<passwd>")) return 0;
SLOGD("cryptfs verifypw {}");
rc = cryptfs_verify_passwd(argv[2]);
} else if (subcommand == "getfield") {
if (!check_argc(cli, subcommand, argc, 3, "<fieldname>")) return 0;
char *valbuf;
int valbuf_len = PROPERTY_VALUE_MAX;
dumpArgs(argc, argv, -1);
// Increase the buffer size until it is big enough for the field value stored.
while (1) {
valbuf = (char*)malloc(valbuf_len);
if (valbuf == NULL) {
cli->sendMsg(ResponseCode::OperationFailed, "Failed to allocate memory", false);
return 0;
}
rc = cryptfs_getfield(argv[2], valbuf, valbuf_len);
if (rc != CRYPTO_GETFIELD_ERROR_BUF_TOO_SMALL) {
break;
}
free(valbuf);
valbuf_len *= 2;
}
if (rc == CRYPTO_GETFIELD_OK) {
cli->sendMsg(ResponseCode::CryptfsGetfieldResult, valbuf, false);
}
free(valbuf);
} else if (subcommand == "setfield") {
if (!check_argc(cli, subcommand, argc, 4, "<fieldname> <value>")) return 0;
dumpArgs(argc, argv, -1);
rc = cryptfs_setfield(argv[2], argv[3]);
} else if (subcommand == "mountdefaultencrypted") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
SLOGD("cryptfs mountdefaultencrypted");
dumpArgs(argc, argv, -1);
// Spawn as thread so init can issue commands back to vold without
// causing deadlock, usually as a result of prep_data_fs.
std::thread(&cryptfs_mount_default_encrypted).detach();
} else if (subcommand == "getpwtype") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
SLOGD("cryptfs getpwtype");
dumpArgs(argc, argv, -1);
switch(cryptfs_get_password_type()) {
case CRYPT_TYPE_PASSWORD:
cli->sendMsg(ResponseCode::PasswordTypeResult, "password", false);
return 0;
case CRYPT_TYPE_PATTERN:
cli->sendMsg(ResponseCode::PasswordTypeResult, "pattern", false);
return 0;
case CRYPT_TYPE_PIN:
cli->sendMsg(ResponseCode::PasswordTypeResult, "pin", false);
return 0;
case CRYPT_TYPE_DEFAULT:
cli->sendMsg(ResponseCode::PasswordTypeResult, "default", false);
return 0;
default:
/** @TODO better error and make sure handled by callers */
cli->sendMsg(ResponseCode::OpFailedStorageNotFound, "Error", false);
return 0;
}
} else if (subcommand == "getpw") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
SLOGD("cryptfs getpw");
dumpArgs(argc, argv, -1);
const char* password = cryptfs_get_password();
if (password) {
char* message = 0;
int size = asprintf(&message, "{{sensitive}} %s", password);
if (size != -1) {
cli->sendMsg(ResponseCode::CommandOkay, message, false);
memset(message, 0, size);
free (message);
return 0;
}
}
rc = -1;
} else if (subcommand == "clearpw") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
SLOGD("cryptfs clearpw");
dumpArgs(argc, argv, -1);
cryptfs_clear_password();
rc = 0;
} else if (subcommand == "isConvertibleToFBE") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
// ext4enc:TODO: send a CommandSyntaxError if argv[2] not an integer
SLOGD("cryptfs isConvertibleToFBE");
dumpArgs(argc, argv, -1);
rc = cryptfs_isConvertibleToFBE();
} else if (subcommand == "init_user0") {
if (!check_argc(cli, subcommand, argc, 2, "")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_init_user0());
} else if (subcommand == "create_user_key") {
if (!check_argc(cli, subcommand, argc, 5, "<user> <serial> <ephemeral>")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_vold_create_user_key(
atoi(argv[2]), atoi(argv[3]), atoi(argv[4]) != 0));
} else if (subcommand == "destroy_user_key") {
if (!check_argc(cli, subcommand, argc, 3, "<user>")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_destroy_user_key(atoi(argv[2])));
} else if (subcommand == "change_user_key") {
if (!check_argc(cli, subcommand, argc, 7,
"<user> <serial> <token> <old_secret> <new_secret>")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_change_user_key(
atoi(argv[2]), atoi(argv[3]), argv[4], argv[5], argv[6]));
} else if (subcommand == "unlock_user_key") {
if (!check_argc(cli, subcommand, argc, 6, "<user> <serial> <token> <secret>")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_unlock_user_key(
atoi(argv[2]), atoi(argv[3]), argv[4], argv[5]));
} else if (subcommand == "lock_user_key") {
if (!check_argc(cli, subcommand, argc, 3, "<user>")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_lock_user_key(atoi(argv[2])));
} else if (subcommand == "prepare_user_storage") {
if (!check_argc(cli, subcommand, argc, 6, "<uuid> <user> <serial> <flags>")) return 0;
return sendGenericOkFailOnBool(cli, e4crypt_prepare_user_storage(
parseNull(argv[2]), atoi(argv[3]), atoi(argv[4]), atoi(argv[5])));
} else if (subcommand == "destroy_user_storage") {
if (!check_argc(cli, subcommand, argc, 5, "<uuid> <user> <flags>")) return 0;
return sendGenericOkFailOnBool(cli,
e4crypt_destroy_user_storage(parseNull(argv[2]), atoi(argv[3]), atoi(argv[4])));
} else {
dumpArgs(argc, argv, -1);
cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown cryptfs subcommand", false);
return 0;
}
// Always report that the command succeeded and return the error code.
// The caller will check the return value to see what the error was.
char msg[255];
snprintf(msg, sizeof(msg), "%d", rc);
cli->sendMsg(ResponseCode::CommandOkay, msg, false);
return 0;
}