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/*
* Copyright (C) 2014 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.
*/
#define TRACE_TAG ADB
#include "sysdeps.h"
#include <fcntl.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdio.h>
#include <sys/stat.h>
#include "cutils/properties.h"
#include "adb.h"
#include "adb_io.h"
#include "fs_mgr.h"
#include "remount_service.h"
#include "fec/io.h"
#define FSTAB_PREFIX "/fstab."
struct fstab *fstab;
#ifdef ALLOW_ADBD_DISABLE_VERITY
static const bool kAllowDisableVerity = true;
#else
static const bool kAllowDisableVerity = false;
#endif
/* Turn verity on/off */
static int set_verity_enabled_state(int fd, const char *block_device,
const char* mount_point, bool enable)
{
if (!make_block_device_writable(block_device)) {
WriteFdFmt(fd, "Could not make block device %s writable (%s).\n",
block_device, strerror(errno));
return -1;
}
fec::io fh(block_device, O_RDWR);
if (!fh) {
WriteFdFmt(fd, "Could not open block device %s (%s).\n", block_device, strerror(errno));
WriteFdFmt(fd, "Maybe run adb root?\n");
return -1;
}
fec_verity_metadata metadata;
if (!fh.get_verity_metadata(metadata)) {
WriteFdFmt(fd, "Couldn't find verity metadata!\n");
return -1;
}
if (!enable && metadata.disabled) {
WriteFdFmt(fd, "Verity already disabled on %s\n", mount_point);
return -1;
}
if (enable && !metadata.disabled) {
WriteFdFmt(fd, "Verity already enabled on %s\n", mount_point);
return -1;
}
if (!fh.set_verity_status(enable)) {
WriteFdFmt(fd, "Could not set verity %s flag on device %s with error %s\n",
enable ? "enabled" : "disabled",
block_device, strerror(errno));
return -1;
}
WriteFdFmt(fd, "Verity %s on %s\n", enable ? "enabled" : "disabled", mount_point);
return 0;
}
void set_verity_enabled_state_service(int fd, void* cookie)
{
bool enable = (cookie != NULL);
if (kAllowDisableVerity) {
char fstab_filename[PROPERTY_VALUE_MAX + sizeof(FSTAB_PREFIX)];
char propbuf[PROPERTY_VALUE_MAX];
int i;
bool any_changed = false;
property_get("ro.secure", propbuf, "0");
if (strcmp(propbuf, "1")) {
WriteFdFmt(fd, "verity not enabled - ENG build\n");
goto errout;
}
property_get("ro.debuggable", propbuf, "0");
if (strcmp(propbuf, "1")) {
WriteFdFmt(fd, "verity cannot be disabled/enabled - USER build\n");
goto errout;
}
property_get("ro.hardware", propbuf, "");
snprintf(fstab_filename, sizeof(fstab_filename), FSTAB_PREFIX"%s",
propbuf);
fstab = fs_mgr_read_fstab(fstab_filename);
if (!fstab) {
WriteFdFmt(fd, "Failed to open %s\nMaybe run adb root?\n", fstab_filename);
goto errout;
}
/* Loop through entries looking for ones that vold manages */
for (i = 0; i < fstab->num_entries; i++) {
if(fs_mgr_is_verified(&fstab->recs[i])) {
if (!set_verity_enabled_state(fd, fstab->recs[i].blk_device,
fstab->recs[i].mount_point,
enable)) {
any_changed = true;
}
}
}
if (any_changed) {
WriteFdFmt(fd, "Now reboot your device for settings to take effect\n");
}
} else {
WriteFdFmt(fd, "%s-verity only works for userdebug builds\n",
enable ? "enable" : "disable");
}
errout:
adb_close(fd);
}
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