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CryptCommandListener.cpp
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CryptCommandListener.cpp
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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/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>
#define LOG_TAG "VoldCryptCmdListener"
#include <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"
#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::sendGenericOkFail(SocketClient *cli, int cond) {
if (!cond) {
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;
}
}
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 Argument", false);
return 0;
}
int rc = 0;
if (!strcmp(argv[1], "checkpw")) {
if (argc != 3) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs checkpw <passwd>", false);
return 0;
}
dumpArgs(argc, argv, 2);
rc = cryptfs_check_passwd(argv[2]);
} else if (!strcmp(argv[1], "restart")) {
if (argc != 2) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs restart", false);
return 0;
}
dumpArgs(argc, argv, -1);
rc = cryptfs_restart();
} else if (!strcmp(argv[1], "cryptocomplete")) {
if (argc != 2) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs cryptocomplete", false);
return 0;
}
dumpArgs(argc, argv, -1);
rc = cryptfs_crypto_complete();
} else if (!strcmp(argv[1], "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);
int tries;
for (tries = 0; tries < 2; ++tries) {
if (type == -1) {
cli->sendMsg(ResponseCode::CommandSyntaxError, syntax,
false);
return 0;
} else if (type == CRYPT_TYPE_DEFAULT) {
rc = cryptfs_enable_default(argv[2], no_ui);
} else {
rc = cryptfs_enable(argv[2], type, argv[4], no_ui);
}
if (rc == 0) {
break;
} else if (tries == 0) {
Process::killProcessesWithOpenFiles(DATA_MNT_POINT, SIGKILL);
}
}
} else if (!strcmp(argv[1], "enablefilecrypto")) {
const char* syntax = "Usage: cryptfs enablefilecrypto";
if (argc != 2) {
cli->sendMsg(ResponseCode::CommandSyntaxError, syntax, false);
return 0;
}
dumpArgs(argc, argv, -1);
rc = cryptfs_enable_file();
} else if (!strcmp(argv[1], "changepw")) {
const char* syntax = "Usage: cryptfs changepw "
"default|password|pin|pattern [[currentpasswd] newpasswd]";
const char* password;
const char* currentpassword = "";
if (argc == 3) {
password = "";
}
else if (argc == 4) {
password = argv[3];
} else if (argc == 5) {
currentpassword = argv[3];
password = argv[4];
} 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, currentpassword, password);
} else if (!strcmp(argv[1], "verifypw")) {
if (argc != 3) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs verifypw <passwd>", false);
return 0;
}
SLOGD("cryptfs verifypw {}");
rc = cryptfs_verify_passwd(argv[2]);
} else if (!strcmp(argv[1], "getfield")) {
char *valbuf;
int valbuf_len = PROPERTY_VALUE_MAX;
if (argc != 3) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs getfield <fieldname>", false);
return 0;
}
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 (!strcmp(argv[1], "setfield")) {
if (argc != 4) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: cryptfs setfield <fieldname> <value>", false);
return 0;
}
dumpArgs(argc, argv, -1);
rc = cryptfs_setfield(argv[2], argv[3]);
} else if (!strcmp(argv[1], "mountdefaultencrypted")) {
SLOGD("cryptfs mountdefaultencrypted");
dumpArgs(argc, argv, -1);
rc = cryptfs_mount_default_encrypted();
} else if (!strcmp(argv[1], "getpwtype")) {
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 (!strcmp(argv[1], "getpw")) {
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 (!strcmp(argv[1], "clearpw")) {
SLOGD("cryptfs clearpw");
dumpArgs(argc, argv, -1);
cryptfs_clear_password();
rc = 0;
} else if (!strcmp(argv[1], "setusercryptopolicies")) {
if (argc != 3) {
cli->sendMsg(ResponseCode::CommandSyntaxError,
"Usage: cryptfs setusercryptopolicies <path>", false);
return 0;
}
SLOGD("cryptfs setusercryptopolicies");
dumpArgs(argc, argv, -1);
rc = e4crypt_set_user_crypto_policies(argv[2]);
} else if (!strcmp(argv[1], "createnewuserdir")) {
if (argc != 4) {
cli->sendMsg(ResponseCode::CommandSyntaxError,
"Usage: cryptfs createnewuserdir <userHandle> <path>", false);
return 0;
}
// ext4enc:TODO: send a CommandSyntaxError if argv[2] not an integer
SLOGD("cryptfs createnewuserdir");
dumpArgs(argc, argv, -1);
rc = e4crypt_create_new_user_dir(argv[2], argv[3]);
} else if (!strcmp(argv[1], "deleteuserkey")) {
if (argc != 3) {
cli->sendMsg(ResponseCode::CommandSyntaxError,
"Usage: cryptfs deleteuserkey <userHandle>", false);
return 0;
}
// ext4enc:TODO: send a CommandSyntaxError if argv[2] not an integer
SLOGD("cryptfs deleteuserkey");
dumpArgs(argc, argv, -1);
rc = e4crypt_delete_user_key(argv[2]);
} else {
dumpArgs(argc, argv, -1);
cli->sendMsg(ResponseCode::CommandSyntaxError, "Unknown cryptfs cmd", 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;
}