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Add in ext4 support for ASEC containers

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Now forward locked applications will be in ASEC containers both internal
to the system and externally.

This change adds support for putting applications in ext4-based ASECs.

Change-Id: I8d6765b72dd2606e429c067b47a2dbcaa8bef37d
This commit is contained in:
Kenny Root 2012-04-03 17:23:01 -07:00
parent 8cd47b4c3b
commit 344ca10856
12 changed files with 552 additions and 90 deletions
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1
Android.mk
View file

@ -10,6 +10,7 @@ common_src_files := \
DirectVolume.cpp \
logwrapper.c \
Process.cpp \
Ext4.cpp \
Fat.cpp \
Loop.cpp \
Devmapper.cpp \

1
Asec.h
View file

@ -33,6 +33,7 @@ struct asec_superblock {
unsigned char c_chain;
#define ASEC_SB_C_OPTS_NONE 0
#define ASEC_SB_C_OPTS_EXT4 1
unsigned char c_opts;
#define ASEC_SB_C_MODE_NONE 0

81
CommandListener.cpp
View file

@ -261,6 +261,44 @@ CommandListener::AsecCmd::AsecCmd() :
VoldCommand("asec") {
}
void CommandListener::AsecCmd::listAsecsInDirectory(SocketClient *cli, const char *directory) {
DIR *d = opendir(directory);
if (!d) {
cli->sendMsg(ResponseCode::OperationFailed, "Failed to open asec dir", true);
return;
}
size_t dirent_len = offsetof(struct dirent, d_name) +
pathconf(directory, _PC_NAME_MAX) + 1;
struct dirent *dent = (struct dirent *) malloc(dirent_len);
if (dent == NULL) {
cli->sendMsg(ResponseCode::OperationFailed, "Failed to allocate memory", true);
return;
}
struct dirent *result;
while (!readdir_r(d, dent, &result) && result != NULL) {
if (dent->d_name[0] == '.')
continue;
if (dent->d_type != DT_REG)
continue;
size_t name_len = strlen(dent->d_name);
if (name_len > 5 && name_len < 260 &&
!strcmp(&dent->d_name[name_len - 5], ".asec")) {
char id[255];
memset(id, 0, sizeof(id));
strlcpy(id, dent->d_name, name_len - 5);
cli->sendMsg(ResponseCode::AsecListResult, id, false);
}
}
closedir(d);
free(dent);
}
int CommandListener::AsecCmd::runCommand(SocketClient *cli,
int argc, char **argv) {
if (argc < 2) {
@ -273,35 +311,21 @@ int CommandListener::AsecCmd::runCommand(SocketClient *cli,
if (!strcmp(argv[1], "list")) {
dumpArgs(argc, argv, -1);
DIR *d = opendir(Volume::SEC_ASECDIR);
if (!d) {
cli->sendMsg(ResponseCode::OperationFailed, "Failed to open asec dir", true);
return 0;
}
struct dirent *dent;
while ((dent = readdir(d))) {
if (dent->d_name[0] == '.')
continue;
if (!strcmp(&dent->d_name[strlen(dent->d_name)-5], ".asec")) {
char id[255];
memset(id, 0, sizeof(id));
strncpy(id, dent->d_name, strlen(dent->d_name) -5);
cli->sendMsg(ResponseCode::AsecListResult, id, false);
}
}
closedir(d);
listAsecsInDirectory(cli, Volume::SEC_ASECDIR_EXT);
listAsecsInDirectory(cli, Volume::SEC_ASECDIR_INT);
} else if (!strcmp(argv[1], "create")) {
dumpArgs(argc, argv, 5);
if (argc != 7) {
if (argc != 8) {
cli->sendMsg(ResponseCode::CommandSyntaxError,
"Usage: asec create <container-id> <size_mb> <fstype> <key> <ownerUid>", false);
"Usage: asec create <container-id> <size_mb> <fstype> <key> <ownerUid> "
"<isExternal>", false);
return 0;
}
unsigned int numSectors = (atoi(argv[3]) * (1024 * 1024)) / 512;
rc = vm->createAsec(argv[2], numSectors, argv[4], argv[5], atoi(argv[6]));
const bool isExternal = (atoi(argv[7]) == 1);
rc = vm->createAsec(argv[2], numSectors, argv[4], argv[5], atoi(argv[6]), isExternal);
} else if (!strcmp(argv[1], "finalize")) {
dumpArgs(argc, argv, -1);
if (argc != 3) {
@ -309,6 +333,21 @@ int CommandListener::AsecCmd::runCommand(SocketClient *cli,
return 0;
}
rc = vm->finalizeAsec(argv[2]);
} else if (!strcmp(argv[1], "fixperms")) {
dumpArgs(argc, argv, -1);
if (argc != 5) {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: asec fixperms <container-id> <gid> <filename>", false);
return 0;
}
char *endptr;
gid_t gid = (gid_t) strtoul(argv[3], &endptr, 10);
if (*endptr != '\0') {
cli->sendMsg(ResponseCode::CommandSyntaxError, "Usage: asec fixperms <container-id> <gid> <filename>", false);
return 0;
}
rc = vm->fixupAsecPermissions(argv[2], gid, argv[4]);
} else if (!strcmp(argv[1], "destroy")) {
dumpArgs(argc, argv, -1);
if (argc < 3) {

2
CommandListener.h
View file

@ -47,6 +47,8 @@ private:
AsecCmd();
virtual ~AsecCmd() {}
int runCommand(SocketClient *c, int argc, char ** argv);
private:
void listAsecsInDirectory(SocketClient *c, const char *directory);
};
class ObbCmd : public VoldCommand {

90
Ext4.cpp Normal file
View file

@ -0,0 +1,90 @@
/*
* Copyright (C) 2012 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 <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <sys/mount.h>
#include <linux/kdev_t.h>
#include <linux/fs.h>
#define LOG_TAG "Vold"
#include <cutils/log.h>
#include <cutils/properties.h>
#include "Ext4.h"
#define MKEXT4FS_PATH "/system/bin/make_ext4fs";
extern "C" int logwrap(int argc, const char **argv, int background);
int Ext4::doMount(const char *fsPath, const char *mountPoint, bool ro, bool remount,
bool executable) {
int rc;
unsigned long flags;
flags = MS_NOATIME | MS_NODEV | MS_NOSUID | MS_DIRSYNC;
flags |= (executable ? 0 : MS_NOEXEC);
flags |= (ro ? MS_RDONLY : 0);
flags |= (remount ? MS_REMOUNT : 0);
rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
if (rc && errno == EROFS) {
SLOGE("%s appears to be a read only filesystem - retrying mount RO", fsPath);
flags |= MS_RDONLY;
rc = mount(fsPath, mountPoint, "ext4", flags, NULL);
}
return rc;
}
int Ext4::format(const char *fsPath) {
int fd;
const char *args[4];
int rc;
args[0] = MKEXT4FS_PATH;
args[1] = "-J";
args[2] = fsPath;
args[3] = NULL;
rc = logwrap(3, args, 1);
if (rc == 0) {
SLOGI("Filesystem (ext4) formatted OK");
return 0;
} else {
SLOGE("Format (ext4) failed (unknown exit code %d)", rc);
errno = EIO;
return -1;
}
return 0;
}

29
Ext4.h Normal file
View file

@ -0,0 +1,29 @@
/*
* Copyright (C) 2012 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.
*/
#ifndef _EXT4_H
#define _EXT4_H
#include <unistd.h>
class Ext4 {
public:
static int doMount(const char *fsPath, const char *mountPoint, bool ro, bool remount,
bool executable);
static int format(const char *fsPath);
};
#endif

44
Loop.cpp
View file

@ -21,6 +21,7 @@
#include <errno.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
@ -33,6 +34,7 @@
#include <sysutils/SocketClient.h>
#include "Loop.h"
#include "Asec.h"
int Loop::dumpState(SocketClient *c) {
int i;
@ -246,3 +248,45 @@ int Loop::createImageFile(const char *file, unsigned int numSectors) {
close(fd);
return 0;
}
int Loop::lookupInfo(const char *loopDevice, struct asec_superblock *sb, unsigned int *nr_sec) {
int fd;
struct asec_superblock buffer;
if ((fd = open(loopDevice, O_RDONLY)) < 0) {
SLOGE("Failed to open loopdevice (%s)", strerror(errno));
destroyByDevice(loopDevice);
return -1;
}
if (ioctl(fd, BLKGETSIZE, nr_sec)) {
SLOGE("Failed to get loop size (%s)", strerror(errno));
destroyByDevice(loopDevice);
close(fd);
return -1;
}
/*
* Try to read superblock.
*/
memset(&buffer, 0, sizeof(struct asec_superblock));
if (lseek(fd, ((*nr_sec - 1) * 512), SEEK_SET) < 0) {
SLOGE("lseek failed (%s)", strerror(errno));
close(fd);
destroyByDevice(loopDevice);
return -1;
}
if (read(fd, &buffer, sizeof(struct asec_superblock)) != sizeof(struct asec_superblock)) {
SLOGE("superblock read failed (%s)", strerror(errno));
close(fd);
destroyByDevice(loopDevice);
return -1;
}
close(fd);
/*
* Superblock successfully read. Copy to caller's struct.
*/
memcpy(sb, &buffer, sizeof(struct asec_superblock));
return 0;
}

1
Loop.h
View file

@ -27,6 +27,7 @@ public:
static const int LOOP_MAX = 4096;
public:
static int lookupActive(const char *id, char *buffer, size_t len);
static int lookupInfo(const char *loopDevice, struct asec_superblock *sb, unsigned int *nr_sec);
static int create(const char *id, const char *loopFile, char *loopDeviceBuffer, size_t len);
static int destroyByDevice(const char *loopDevice);
static int destroyByFile(const char *loopFile);

18
Volume.cpp
View file

@ -69,10 +69,14 @@ const char *Volume::SEC_STGDIR = "/mnt/secure/staging";
const char *Volume::SEC_STG_SECIMGDIR = "/mnt/secure/staging/.android_secure";
/*
* Path to where *only* root can access asec imagefiles
* Path to external storage where *only* root can access ASEC image files
*/
const char *Volume::SEC_ASECDIR = "/mnt/secure/asec";
const char *Volume::SEC_ASECDIR_EXT = "/mnt/secure/asec";
/*
* Path to internal storage where *only* root can access ASEC image files
*/
const char *Volume::SEC_ASECDIR_INT = "/data/app-asec";
/*
* Path to where secure containers are mounted
*/
@ -504,9 +508,9 @@ int Volume::createBindMounts() {
* Bind mount /mnt/secure/staging/android_secure -> /mnt/secure/asec so we'll
* have a root only accessable mountpoint for it.
*/
if (mount(SEC_STG_SECIMGDIR, SEC_ASECDIR, "", MS_BIND, NULL)) {
if (mount(SEC_STG_SECIMGDIR, SEC_ASECDIR_EXT, "", MS_BIND, NULL)) {
SLOGE("Failed to bind mount points %s -> %s (%s)",
SEC_STG_SECIMGDIR, SEC_ASECDIR, strerror(errno));
SEC_STG_SECIMGDIR, SEC_ASECDIR_EXT, strerror(errno));
return -1;
}
@ -630,8 +634,8 @@ int Volume::unmountVol(bool force, bool revert) {
* the previously obscured directory.
*/
if (doUnmount(Volume::SEC_ASECDIR, force)) {
SLOGE("Failed to remove bindmount on %s (%s)", SEC_ASECDIR, strerror(errno));
if (doUnmount(Volume::SEC_ASECDIR_EXT, force)) {
SLOGE("Failed to remove bindmount on %s (%s)", SEC_ASECDIR_EXT, strerror(errno));
goto fail_remount_tmpfs;
}
@ -663,7 +667,7 @@ int Volume::unmountVol(bool force, bool revert) {
* Failure handling - try to restore everything back the way it was
*/
fail_recreate_bindmount:
if (mount(SEC_STG_SECIMGDIR, SEC_ASECDIR, "", MS_BIND, NULL)) {
if (mount(SEC_STG_SECIMGDIR, SEC_ASECDIR_EXT, "", MS_BIND, NULL)) {
SLOGE("Failed to restore bindmount after failure! - Storage will appear offline!");
goto out_nomedia;
}

3
Volume.h
View file

@ -41,7 +41,8 @@ public:
static const char *SECDIR;
static const char *SEC_STGDIR;
static const char *SEC_STG_SECIMGDIR;
static const char *SEC_ASECDIR;
static const char *SEC_ASECDIR_EXT;
static const char *SEC_ASECDIR_INT;
static const char *ASECDIR;
static const char *LOOPDIR;

355
VolumeManager.cpp
View file

@ -19,6 +19,8 @@
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <fts.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/mount.h>
@ -33,10 +35,13 @@
#include <sysutils/NetlinkEvent.h>
#include <private/android_filesystem_config.h>
#include "VolumeManager.h"
#include "DirectVolume.h"
#include "ResponseCode.h"
#include "Loop.h"
#include "Ext4.h"
#include "Fat.h"
#include "Devmapper.h"
#include "Process.h"
@ -197,7 +202,11 @@ int VolumeManager::getObbMountPath(const char *sourceFile, char *mountPath, int
int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) {
char asecFileName[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
memset(buffer, 0, maxlen);
if (access(asecFileName, F_OK)) {
@ -211,7 +220,11 @@ int VolumeManager::getAsecMountPath(const char *id, char *buffer, int maxlen) {
int VolumeManager::getAsecFilesystemPath(const char *id, char *buffer, int maxlen) {
char asecFileName[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
memset(buffer, 0, maxlen);
if (access(asecFileName, F_OK)) {
@ -223,11 +236,24 @@ int VolumeManager::getAsecFilesystemPath(const char *id, char *buffer, int maxle
return 0;
}
int VolumeManager::createAsec(const char *id, unsigned int numSectors,
const char *fstype, const char *key, int ownerUid) {
int VolumeManager::createAsec(const char *id, unsigned int numSectors, const char *fstype,
const char *key, const int ownerUid, bool isExternal) {
struct asec_superblock sb;
memset(&sb, 0, sizeof(sb));
const bool wantFilesystem = strcmp(fstype, "none");
bool usingExt4 = false;
if (wantFilesystem) {
usingExt4 = !strcmp(fstype, "ext4");
if (usingExt4) {
sb.c_opts |= ASEC_SB_C_OPTS_EXT4;
} else if (strcmp(fstype, "fat")) {
SLOGE("Invalid filesystem type %s", fstype);
errno = EINVAL;
return -1;
}
}
sb.magic = ASEC_SB_MAGIC;
sb.ver = ASEC_SB_VER;
@ -244,11 +270,21 @@ int VolumeManager::createAsec(const char *id, unsigned int numSectors,
}
char asecFileName[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (!findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
asecFileName, strerror(errno));
errno = EADDRINUSE;
return -1;
}
const char *asecDir = isExternal ? Volume::SEC_ASECDIR_EXT : Volume::SEC_ASECDIR_INT;
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", asecDir, id);
if (!access(asecFileName, F_OK)) {
SLOGE("ASEC file '%s' currently exists - destroy it first! (%s)",
asecFileName, strerror(errno));
asecFileName, strerror(errno));
errno = EADDRINUSE;
return -1;
}
@ -340,13 +376,16 @@ int VolumeManager::createAsec(const char *id, unsigned int numSectors,
}
close(sbfd);
if (strcmp(fstype, "none")) {
if (strcmp(fstype, "fat")) {
SLOGW("Unknown fstype '%s' specified for container", fstype);
if (wantFilesystem) {
int formatStatus;
if (usingExt4) {
formatStatus = Ext4::format(dmDevice);
} else {
formatStatus = Fat::format(dmDevice, numImgSectors);
}
if (Fat::format(dmDevice, numImgSectors)) {
SLOGE("ASEC FAT format failed (%s)", strerror(errno));
if (formatStatus < 0) {
SLOGE("ASEC fs format failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);
}
@ -354,10 +393,11 @@ int VolumeManager::createAsec(const char *id, unsigned int numSectors,
unlink(asecFileName);
return -1;
}
char mountPoint[255];
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if (mkdir(mountPoint, 0777)) {
if (mkdir(mountPoint, 0000)) {
if (errno != EEXIST) {
SLOGE("Mountpoint creation failed (%s)", strerror(errno));
if (cleanupDm) {
@ -369,8 +409,15 @@ int VolumeManager::createAsec(const char *id, unsigned int numSectors,
}
}
if (Fat::doMount(dmDevice, mountPoint, false, false, false, ownerUid,
0, 0000, false)) {
int mountStatus;
if (usingExt4) {
mountStatus = Ext4::doMount(dmDevice, mountPoint, false, false, false);
} else {
mountStatus = Fat::doMount(dmDevice, mountPoint, false, false, false, ownerUid, 0, 0000,
false);
}
if (mountStatus) {
SLOGE("ASEC FAT mount failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);
@ -379,6 +426,17 @@ int VolumeManager::createAsec(const char *id, unsigned int numSectors,
unlink(asecFileName);
return -1;
}
if (usingExt4) {
int dirfd = open(mountPoint, O_DIRECTORY);
if (dirfd >= 0) {
if (fchown(dirfd, ownerUid, AID_SYSTEM)
|| fchmod(dirfd, S_IRUSR | S_IWUSR | S_IXUSR | S_ISGID | S_IRGRP | S_IXGRP)) {
SLOGI("Cannot chown/chmod new ASEC mount point %s", mountPoint);
}
close(dirfd);
}
}
} else {
SLOGI("Created raw secure container %s (no filesystem)", id);
}
@ -392,7 +450,10 @@ int VolumeManager::finalizeAsec(const char *id) {
char loopDevice[255];
char mountPoint[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
char idHash[33];
if (!asecHash(id, idHash, sizeof(idHash))) {
@ -405,9 +466,23 @@ int VolumeManager::finalizeAsec(const char *id) {
return -1;
}
unsigned int nr_sec = 0;
struct asec_superblock sb;
if (Loop::lookupInfo(loopDevice, &sb, &nr_sec)) {
return -1;
}
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
// XXX:
if (Fat::doMount(loopDevice, mountPoint, true, true, true, 0, 0, 0227, false)) {
int result = 0;
if (sb.c_opts & ASEC_SB_C_OPTS_EXT4) {
result = Ext4::doMount(loopDevice, mountPoint, true, true, true);
} else {
result = Fat::doMount(loopDevice, mountPoint, true, true, true, 0, 0, 0227, false);
}
if (result) {
SLOGE("ASEC finalize mount failed (%s)", strerror(errno));
return -1;
}
@ -418,13 +493,131 @@ int VolumeManager::finalizeAsec(const char *id) {
return 0;
}
int VolumeManager::fixupAsecPermissions(const char *id, gid_t gid, const char* filename) {
char asecFileName[255];
char loopDevice[255];
char mountPoint[255];
if (gid < AID_APP) {
SLOGE("Group ID is not in application range");
return -1;
}
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
char idHash[33];
if (!asecHash(id, idHash, sizeof(idHash))) {
SLOGE("Hash of '%s' failed (%s)", id, strerror(errno));
return -1;
}
if (Loop::lookupActive(idHash, loopDevice, sizeof(loopDevice))) {
SLOGE("Unable fix permissions during lookup on %s (%s)", id, strerror(errno));
return -1;
}
unsigned int nr_sec = 0;
struct asec_superblock sb;
if (Loop::lookupInfo(loopDevice, &sb, &nr_sec)) {
return -1;
}
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
int result = 0;
if ((sb.c_opts & ASEC_SB_C_OPTS_EXT4) == 0) {
return 0;
}
int ret = Ext4::doMount(loopDevice, mountPoint,
false /* read-only */,
true /* remount */,
false /* executable */);
if (ret) {
SLOGE("Unable remount to fix permissions for %s (%s)", id, strerror(errno));
return -1;
}
char *paths[] = { mountPoint, NULL };
FTS *fts = fts_open(paths, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, NULL);
if (fts) {
// Traverse the entire hierarchy and chown to system UID.
for (FTSENT *ftsent = fts_read(fts); ftsent != NULL; ftsent = fts_read(fts)) {
// We don't care about the lost+found directory.
if (!strcmp(ftsent->fts_name, "lost+found")) {
continue;
}
/*
* There can only be one file marked as private right now.
* This should be more robust, but it satisfies the requirements
* we have for right now.
*/
const bool privateFile = !strcmp(ftsent->fts_name, filename);
int fd = open(ftsent->fts_accpath, O_NOFOLLOW);
if (fd < 0) {
SLOGE("Couldn't open file %s: %s", ftsent->fts_accpath, strerror(errno));
result = -1;
continue;
}
result |= fchown(fd, AID_SYSTEM, privateFile? gid : AID_SYSTEM);
if (ftsent->fts_info & FTS_D) {
result |= fchmod(fd, 0711);
} else {
result |= fchmod(fd, privateFile ? 0640 : 0644);
}
close(fd);
}
fts_close(fts);
// Finally make the directory readable by everyone.
int dirfd = open(mountPoint, O_DIRECTORY);
if (dirfd < 0 || fchmod(dirfd, 0755)) {
SLOGE("Couldn't change owner of existing directory %s: %s", mountPoint, strerror(errno));
result |= -1;
}
close(dirfd);
} else {
result |= -1;
}
result |= Ext4::doMount(loopDevice, mountPoint,
true /* read-only */,
true /* remount */,
true /* execute */);
if (result) {
SLOGE("ASEC fix permissions failed (%s)", strerror(errno));
return -1;
}
if (mDebug) {
SLOGD("ASEC %s permissions fixed", id);
}
return 0;
}
int VolumeManager::renameAsec(const char *id1, const char *id2) {
char *asecFilename1;
char asecFilename1[255];
char *asecFilename2;
char mountPoint[255];
asprintf(&asecFilename1, "%s/%s.asec", Volume::SEC_ASECDIR, id1);
asprintf(&asecFilename2, "%s/%s.asec", Volume::SEC_ASECDIR, id2);
const char *dir;
if (findAsec(id1, asecFilename1, sizeof(asecFilename1), &dir)) {
SLOGE("Couldn't find ASEC %s", id1);
return -1;
}
asprintf(&asecFilename2, "%s/%s.asec", dir, id2);
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id1);
if (isMountpointMounted(mountPoint)) {
@ -451,12 +644,10 @@ int VolumeManager::renameAsec(const char *id1, const char *id2) {
goto out_err;
}
free(asecFilename1);
free(asecFilename2);
return 0;
out_err:
free(asecFilename1);
free(asecFilename2);
return -1;
}
@ -467,7 +658,11 @@ int VolumeManager::unmountAsec(const char *id, bool force) {
char asecFileName[255];
char mountPoint[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
char idHash[33];
@ -579,7 +774,11 @@ int VolumeManager::destroyAsec(const char *id, bool force) {
char asecFileName[255];
char mountPoint[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if (isMountpointMounted(mountPoint)) {
@ -603,11 +802,70 @@ int VolumeManager::destroyAsec(const char *id, bool force) {
return 0;
}
bool VolumeManager::isAsecInDirectory(const char *dir, const char *asecName) const {
int dirfd = open(dir, O_DIRECTORY);
if (dirfd < 0) {
SLOGE("Couldn't open internal ASEC dir (%s)", strerror(errno));
return -1;
}
bool ret = false;
if (!faccessat(dirfd, asecName, F_OK, AT_SYMLINK_NOFOLLOW)) {
ret = true;
}
close(dirfd);
return ret;
}
int VolumeManager::findAsec(const char *id, char *asecPath, size_t asecPathLen,
const char **directory) const {
int dirfd, fd;
const int idLen = strlen(id);
char *asecName;
if (asprintf(&asecName, "%s.asec", id) < 0) {
SLOGE("Couldn't allocate string to write ASEC name");
return -1;
}
const char *dir;
if (isAsecInDirectory(Volume::SEC_ASECDIR_INT, asecName)) {
dir = Volume::SEC_ASECDIR_INT;
} else if (isAsecInDirectory(Volume::SEC_ASECDIR_EXT, asecName)) {
dir = Volume::SEC_ASECDIR_EXT;
} else {
free(asecName);
return -1;
}
if (directory != NULL) {
*directory = dir;
}
if (asecPath != NULL) {
int written = snprintf(asecPath, asecPathLen, "%s/%s", dir, asecName);
if (written < 0 || static_cast<size_t>(written) >= asecPathLen) {
free(asecName);
return -1;
}
}
free(asecName);
return 0;
}
int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
char asecFileName[255];
char mountPoint[255];
snprintf(asecFileName, sizeof(asecFileName), "%s/%s.asec", Volume::SEC_ASECDIR, id);
if (findAsec(id, asecFileName, sizeof(asecFileName))) {
SLOGE("Couldn't find ASEC %s", id);
return -1;
}
snprintf(mountPoint, sizeof(mountPoint), "%s/%s", Volume::ASECDIR, id);
if (isMountpointMounted(mountPoint)) {
@ -641,39 +899,11 @@ int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
bool cleanupDm = false;
int fd;
unsigned int nr_sec = 0;
if ((fd = open(loopDevice, O_RDWR)) < 0) {
SLOGE("Failed to open loopdevice (%s)", strerror(errno));
Loop::destroyByDevice(loopDevice);
return -1;
}
if (ioctl(fd, BLKGETSIZE, &nr_sec)) {
SLOGE("Failed to get loop size (%s)", strerror(errno));
Loop::destroyByDevice(loopDevice);
close(fd);
return -1;
}
/*
* Validate superblock
*/
struct asec_superblock sb;
memset(&sb, 0, sizeof(sb));
if (lseek(fd, ((nr_sec-1) * 512), SEEK_SET) < 0) {
SLOGE("lseek failed (%s)", strerror(errno));
close(fd);
Loop::destroyByDevice(loopDevice);
return -1;
}
if (read(fd, &sb, sizeof(sb)) != sizeof(sb)) {
SLOGE("superblock read failed (%s)", strerror(errno));
close(fd);
Loop::destroyByDevice(loopDevice);
return -1;
}
close(fd);
if (Loop::lookupInfo(loopDevice, &sb, &nr_sec)) {
return -1;
}
if (mDebug) {
SLOGD("Container sb magic/ver (%.8x/%.2x)", sb.magic, sb.ver);
@ -707,7 +937,7 @@ int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
strcpy(dmDevice, loopDevice);
}
if (mkdir(mountPoint, 0777)) {
if (mkdir(mountPoint, 0000)) {
if (errno != EEXIST) {
SLOGE("Mountpoint creation failed (%s)", strerror(errno));
if (cleanupDm) {
@ -718,9 +948,14 @@ int VolumeManager::mountAsec(const char *id, const char *key, int ownerUid) {
}
}
if (Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0,
0222, false)) {
// 0227, false)) {
int result;
if (sb.c_opts & ASEC_SB_C_OPTS_EXT4) {
result = Ext4::doMount(dmDevice, mountPoint, true, false, true);
} else {
result = Fat::doMount(dmDevice, mountPoint, true, false, true, ownerUid, 0, 0222, false);
}
if (result) {
SLOGE("ASEC mount failed (%s)", strerror(errno));
if (cleanupDm) {
Devmapper::destroy(idHash);

17
VolumeManager.h
View file

@ -87,9 +87,23 @@ public:
void disableVolumeManager(void) { mVolManagerDisabled = 1; }
/* ASEC */
int findAsec(const char *id, char *asecPath = NULL, size_t asecPathLen = 0,
const char **directory = NULL) const;
int createAsec(const char *id, unsigned numSectors, const char *fstype,
const char *key, int ownerUid);
const char *key, const int ownerUid, bool isExternal);
int finalizeAsec(const char *id);
/**
* Fixes ASEC permissions on a filesystem that has owners and permissions.
* This currently means EXT4-based ASEC containers.
*
* There is a single file that can be marked as "private" and will not have
* world-readable permission. The group for that file will be set to the gid
* supplied.
*
* Returns 0 on success.
*/
int fixupAsecPermissions(const char *id, gid_t gid, const char* privateFilename);
int destroyAsec(const char *id, bool force);
int mountAsec(const char *id, const char *key, int ownerUid);
int unmountAsec(const char *id, bool force);
@ -127,6 +141,7 @@ private:
VolumeManager();
void readInitialState();
bool isMountpointMounted(const char *mp);
bool isAsecInDirectory(const char *dir, const char *asec) const;
};
extern "C" {