TWRP-ify AOSP code
Pull in most TWRP sources
Stub out partition management code
Make it compile -- probably will not boot
Kind of a mess but have to start somewhere
diff --git a/crypto/fs_mgr/fs_mgr.c b/crypto/fs_mgr/fs_mgr.c
new file mode 100644
index 0000000..0361ab8
--- /dev/null
+++ b/crypto/fs_mgr/fs_mgr.c
@@ -0,0 +1,611 @@
+/*
+ * 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.
+ */
+
+/* TO DO:
+ * 1. Re-direct fsck output to the kernel log?
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <ctype.h>
+#include <sys/mount.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <libgen.h>
+#include <time.h>
+
+#include <private/android_filesystem_config.h>
+#include <cutils/partition_utils.h>
+#include <cutils/properties.h>
+
+#include "fs_mgr_priv.h"
+
+#define KEY_LOC_PROP "ro.crypto.keyfile.userdata"
+#define KEY_IN_FOOTER "footer"
+
+#define E2FSCK_BIN "/system/bin/e2fsck"
+
+struct flag_list {
+ const char *name;
+ unsigned flag;
+};
+
+static struct flag_list mount_flags[] = {
+ { "noatime", MS_NOATIME },
+ { "noexec", MS_NOEXEC },
+ { "nosuid", MS_NOSUID },
+ { "nodev", MS_NODEV },
+ { "nodiratime", MS_NODIRATIME },
+ { "ro", MS_RDONLY },
+ { "rw", 0 },
+ { "remount", MS_REMOUNT },
+ { "defaults", 0 },
+ { 0, 0 },
+};
+
+static struct flag_list fs_mgr_flags[] = {
+ { "wait", MF_WAIT },
+ { "check", MF_CHECK },
+ { "encryptable=",MF_CRYPT },
+ { "defaults", 0 },
+ { 0, 0 },
+};
+
+/*
+ * gettime() - returns the time in seconds of the system's monotonic clock or
+ * zero on error.
+ */
+static time_t gettime(void)
+{
+ struct timespec ts;
+ int ret;
+
+ ret = clock_gettime(CLOCK_MONOTONIC, &ts);
+ if (ret < 0) {
+ ERROR("clock_gettime(CLOCK_MONOTONIC) failed: %s\n", strerror(errno));
+ return 0;
+ }
+
+ return ts.tv_sec;
+}
+
+static int wait_for_file(const char *filename, int timeout)
+{
+ struct stat info;
+ time_t timeout_time = gettime() + timeout;
+ int ret = -1;
+
+ while (gettime() < timeout_time && ((ret = stat(filename, &info)) < 0))
+ usleep(10000);
+
+ return ret;
+}
+
+static int parse_flags(char *flags, struct flag_list *fl, char **key_loc,
+ char *fs_options, int fs_options_len)
+{
+ int f = 0;
+ int i;
+ char *p;
+ char *savep;
+
+ /* initialize key_loc to null, if we find an MF_CRYPT flag,
+ * then we'll set key_loc to the proper value */
+ if (key_loc) {
+ *key_loc = NULL;
+ }
+ /* initialize fs_options to the null string */
+ if (fs_options && (fs_options_len > 0)) {
+ fs_options[0] = '\0';
+ }
+
+ p = strtok_r(flags, ",", &savep);
+ while (p) {
+ /* Look for the flag "p" in the flag list "fl"
+ * If not found, the loop exits with fl[i].name being null.
+ */
+ for (i = 0; fl[i].name; i++) {
+ if (!strncmp(p, fl[i].name, strlen(fl[i].name))) {
+ f |= fl[i].flag;
+ if ((fl[i].flag == MF_CRYPT) && key_loc) {
+ /* The encryptable flag is followed by an = and the
+ * location of the keys. Get it and return it.
+ */
+ *key_loc = strdup(strchr(p, '=') + 1);
+ }
+ break;
+ }
+ }
+
+ if (!fl[i].name) {
+ if (fs_options) {
+ /* It's not a known flag, so it must be a filesystem specific
+ * option. Add it to fs_options if it was passed in.
+ */
+ strlcat(fs_options, p, fs_options_len);
+ strlcat(fs_options, ",", fs_options_len);
+ } else {
+ /* fs_options was not passed in, so if the flag is unknown
+ * it's an error.
+ */
+ ERROR("Warning: unknown flag %s\n", p);
+ }
+ }
+ p = strtok_r(NULL, ",", &savep);
+ }
+
+out:
+ if (fs_options && fs_options[0]) {
+ /* remove the last trailing comma from the list of options */
+ fs_options[strlen(fs_options) - 1] = '\0';
+ }
+
+ return f;
+}
+
+/* Read a line of text till the next newline character.
+ * If no newline is found before the buffer is full, continue reading till a new line is seen,
+ * then return an empty buffer. This effectively ignores lines that are too long.
+ * On EOF, return null.
+ */
+static char *getline(char *buf, int size, FILE *file)
+{
+ int cnt = 0;
+ int eof = 0;
+ int eol = 0;
+ int c;
+
+ if (size < 1) {
+ return NULL;
+ }
+
+ while (cnt < (size - 1)) {
+ c = getc(file);
+ if (c == EOF) {
+ eof = 1;
+ break;
+ }
+
+ *(buf + cnt) = c;
+ cnt++;
+
+ if (c == '\n') {
+ eol = 1;
+ break;
+ }
+ }
+
+ /* Null terminate what we've read */
+ *(buf + cnt) = '\0';
+
+ if (eof) {
+ if (cnt) {
+ return buf;
+ } else {
+ return NULL;
+ }
+ } else if (eol) {
+ return buf;
+ } else {
+ /* The line is too long. Read till a newline or EOF.
+ * If EOF, return null, if newline, return an empty buffer.
+ */
+ while(1) {
+ c = getc(file);
+ if (c == EOF) {
+ return NULL;
+ } else if (c == '\n') {
+ *buf = '\0';
+ return buf;
+ }
+ }
+ }
+}
+
+static struct fstab_rec *read_fstab(char *fstab_path)
+{
+ FILE *fstab_file;
+ int cnt, entries;
+ int len;
+ char line[256];
+ const char *delim = " \t";
+ char *save_ptr, *p;
+ struct fstab_rec *fstab;
+ char *key_loc;
+#define FS_OPTIONS_LEN 1024
+ char tmp_fs_options[FS_OPTIONS_LEN];
+
+ fstab_file = fopen(fstab_path, "r");
+ if (!fstab_file) {
+ ERROR("Cannot open file %s\n", fstab_path);
+ return 0;
+ }
+
+ entries = 0;
+ while (getline(line, sizeof(line), fstab_file)) {
+ /* if the last character is a newline, shorten the string by 1 byte */
+ len = strlen(line);
+ if (line[len - 1] == '\n') {
+ line[len - 1] = '\0';
+ }
+ /* Skip any leading whitespace */
+ p = line;
+ while (isspace(*p)) {
+ p++;
+ }
+ /* ignore comments or empty lines */
+ if (*p == '#' || *p == '\0')
+ continue;
+ entries++;
+ }
+
+ if (!entries) {
+ ERROR("No entries found in fstab\n");
+ return 0;
+ }
+
+ fstab = calloc(entries + 1, sizeof(struct fstab_rec));
+
+ fseek(fstab_file, 0, SEEK_SET);
+
+ cnt = 0;
+ while (getline(line, sizeof(line), fstab_file)) {
+ /* if the last character is a newline, shorten the string by 1 byte */
+ len = strlen(line);
+ if (line[len - 1] == '\n') {
+ line[len - 1] = '\0';
+ }
+
+ /* Skip any leading whitespace */
+ p = line;
+ while (isspace(*p)) {
+ p++;
+ }
+ /* ignore comments or empty lines */
+ if (*p == '#' || *p == '\0')
+ continue;
+
+ /* If a non-comment entry is greater than the size we allocated, give an
+ * error and quit. This can happen in the unlikely case the file changes
+ * between the two reads.
+ */
+ if (cnt >= entries) {
+ ERROR("Tried to process more entries than counted\n");
+ break;
+ }
+
+ if (!(p = strtok_r(line, delim, &save_ptr))) {
+ ERROR("Error parsing mount source\n");
+ return 0;
+ }
+ fstab[cnt].blk_dev = strdup(p);
+
+ if (!(p = strtok_r(NULL, delim, &save_ptr))) {
+ ERROR("Error parsing mnt_point\n");
+ return 0;
+ }
+ fstab[cnt].mnt_point = strdup(p);
+
+ if (!(p = strtok_r(NULL, delim, &save_ptr))) {
+ ERROR("Error parsing fs_type\n");
+ return 0;
+ }
+ fstab[cnt].type = strdup(p);
+
+ if (!(p = strtok_r(NULL, delim, &save_ptr))) {
+ ERROR("Error parsing mount_flags\n");
+ return 0;
+ }
+ tmp_fs_options[0] = '\0';
+ fstab[cnt].flags = parse_flags(p, mount_flags, 0, tmp_fs_options, FS_OPTIONS_LEN);
+
+ /* fs_options are optional */
+ if (tmp_fs_options[0]) {
+ fstab[cnt].fs_options = strdup(tmp_fs_options);
+ } else {
+ fstab[cnt].fs_options = NULL;
+ }
+
+ if (!(p = strtok_r(NULL, delim, &save_ptr))) {
+ ERROR("Error parsing fs_mgr_options\n");
+ return 0;
+ }
+ fstab[cnt].fs_mgr_flags = parse_flags(p, fs_mgr_flags, &key_loc, 0, 0);
+ fstab[cnt].key_loc = key_loc;
+
+ cnt++;
+ }
+ fclose(fstab_file);
+
+ return fstab;
+}
+
+static void free_fstab(struct fstab_rec *fstab)
+{
+ int i = 0;
+
+ while (fstab[i].blk_dev) {
+ /* Free the pointers return by strdup(3) */
+ free(fstab[i].blk_dev);
+ free(fstab[i].mnt_point);
+ free(fstab[i].type);
+ free(fstab[i].fs_options);
+ free(fstab[i].key_loc);
+
+ i++;
+ }
+
+ /* Free the actual fstab array created by calloc(3) */
+ free(fstab);
+}
+
+static void check_fs(char *blk_dev, char *type)
+{
+ pid_t pid;
+ int status;
+
+ /* Check for the types of filesystems we know how to check */
+ if (!strcmp(type, "ext2") || !strcmp(type, "ext3") || !strcmp(type, "ext4")) {
+ INFO("Running %s on %s\n", E2FSCK_BIN, blk_dev);
+ pid = fork();
+ if (pid > 0) {
+ /* Parent, wait for the child to return */
+ waitpid(pid, &status, 0);
+ } else if (pid == 0) {
+ /* child, run checker */
+ execlp(E2FSCK_BIN, E2FSCK_BIN, "-y", blk_dev, (char *)NULL);
+
+ /* Only gets here on error */
+ ERROR("Cannot run fs_mgr binary %s\n", E2FSCK_BIN);
+ } else {
+ /* No need to check for error in fork, we can't really handle it now */
+ ERROR("Fork failed trying to run %s\n", E2FSCK_BIN);
+ }
+ }
+
+ return;
+}
+
+static void remove_trailing_slashes(char *n)
+{
+ int len;
+
+ len = strlen(n) - 1;
+ while ((*(n + len) == '/') && len) {
+ *(n + len) = '\0';
+ len--;
+ }
+}
+
+static int fs_match(char *in1, char *in2)
+{
+ char *n1;
+ char *n2;
+ int ret;
+
+ n1 = strdup(in1);
+ n2 = strdup(in2);
+
+ remove_trailing_slashes(n1);
+ remove_trailing_slashes(n2);
+
+ ret = !strcmp(n1, n2);
+
+ free(n1);
+ free(n2);
+
+ return ret;
+}
+
+int fs_mgr_mount_all(char *fstab_file)
+{
+ int i = 0;
+ int encrypted = 0;
+ int ret = -1;
+ int mret;
+ struct fstab_rec *fstab = 0;
+
+ if (!(fstab = read_fstab(fstab_file))) {
+ return ret;
+ }
+
+ for (i = 0; fstab[i].blk_dev; i++) {
+ if (fstab[i].fs_mgr_flags & MF_WAIT) {
+ wait_for_file(fstab[i].blk_dev, WAIT_TIMEOUT);
+ }
+
+ if (fstab[i].fs_mgr_flags & MF_CHECK) {
+ check_fs(fstab[i].blk_dev, fstab[i].type);
+ }
+
+ mret = mount(fstab[i].blk_dev, fstab[i].mnt_point, fstab[i].type,
+ fstab[i].flags, fstab[i].fs_options);
+ if (!mret) {
+ /* Success! Go get the next one */
+ continue;
+ }
+
+ /* mount(2) returned an error, check if it's encrypted and deal with it */
+ if ((fstab[i].fs_mgr_flags & MF_CRYPT) && !partition_wiped(fstab[i].blk_dev)) {
+ /* Need to mount a tmpfs at this mountpoint for now, and set
+ * properties that vold will query later for decrypting
+ */
+ if (mount("tmpfs", fstab[i].mnt_point, "tmpfs",
+ MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS) < 0) {
+ ERROR("Cannot mount tmpfs filesystem for encrypted fs at %s\n",
+ fstab[i].mnt_point);
+ goto out;
+ }
+ encrypted = 1;
+ } else {
+ ERROR("Cannot mount filesystem on %s at %s\n",
+ fstab[i].blk_dev, fstab[i].mnt_point);
+ goto out;
+ }
+ }
+
+ if (encrypted) {
+ ret = 1;
+ } else {
+ ret = 0;
+ }
+
+out:
+ free_fstab(fstab);
+ return ret;
+}
+
+/* If tmp_mnt_point is non-null, mount the filesystem there. This is for the
+ * tmp mount we do to check the user password
+ */
+int fs_mgr_do_mount(char *fstab_file, char *n_name, char *n_blk_dev, char *tmp_mnt_point)
+{
+ int i = 0;
+ int ret = -1;
+ struct fstab_rec *fstab = 0;
+ char *m;
+
+ if (!(fstab = read_fstab(fstab_file))) {
+ return ret;
+ }
+
+ for (i = 0; fstab[i].blk_dev; i++) {
+ if (!fs_match(fstab[i].mnt_point, n_name)) {
+ continue;
+ }
+
+ /* We found our match */
+ /* First check the filesystem if requested */
+ if (fstab[i].fs_mgr_flags & MF_WAIT) {
+ wait_for_file(fstab[i].blk_dev, WAIT_TIMEOUT);
+ }
+
+ if (fstab[i].fs_mgr_flags & MF_CHECK) {
+ check_fs(fstab[i].blk_dev, fstab[i].type);
+ }
+
+ /* Now mount it where requested */
+ if (tmp_mnt_point) {
+ m = tmp_mnt_point;
+ } else {
+ m = fstab[i].mnt_point;
+ }
+ if (mount(n_blk_dev, m, fstab[i].type,
+ fstab[i].flags, fstab[i].fs_options)) {
+ ERROR("Cannot mount filesystem on %s at %s\n",
+ n_blk_dev, m);
+ goto out;
+ } else {
+ ret = 0;
+ goto out;
+ }
+ }
+
+ /* We didn't find a match, say so and return an error */
+ ERROR("Cannot find mount point %s in fstab\n", fstab[i].mnt_point);
+
+out:
+ free_fstab(fstab);
+ return ret;
+}
+
+/*
+ * mount a tmpfs filesystem at the given point.
+ * return 0 on success, non-zero on failure.
+ */
+int fs_mgr_do_tmpfs_mount(char *n_name)
+{
+ int ret;
+
+ ret = mount("tmpfs", n_name, "tmpfs",
+ MS_NOATIME | MS_NOSUID | MS_NODEV, CRYPTO_TMPFS_OPTIONS);
+ if (ret < 0) {
+ ERROR("Cannot mount tmpfs filesystem at %s\n", n_name);
+ return -1;
+ }
+
+ /* Success */
+ return 0;
+}
+
+int fs_mgr_unmount_all(char *fstab_file)
+{
+ int i = 0;
+ int ret = 0;
+ struct fstab_rec *fstab = 0;
+
+ if (!(fstab = read_fstab(fstab_file))) {
+ return -1;
+ }
+
+ while (fstab[i].blk_dev) {
+ if (umount(fstab[i].mnt_point)) {
+ ERROR("Cannot unmount filesystem at %s\n", fstab[i].mnt_point);
+ ret = -1;
+ }
+ i++;
+ }
+
+ free_fstab(fstab);
+ return ret;
+}
+/*
+ * key_loc must be at least PROPERTY_VALUE_MAX bytes long
+ *
+ * real_blk_dev must be at least PROPERTY_VALUE_MAX bytes long
+ */
+int fs_mgr_get_crypt_info(char *fstab_file, char *key_loc, char *real_blk_dev, int size)
+{
+ int i = 0;
+ struct fstab_rec *fstab = 0;
+
+ if (!(fstab = read_fstab(fstab_file))) {
+ return -1;
+ }
+ /* Initialize return values to null strings */
+ if (key_loc) {
+ *key_loc = '\0';
+ }
+ if (real_blk_dev) {
+ *real_blk_dev = '\0';
+ }
+
+ /* Look for the encryptable partition to find the data */
+ for (i = 0; fstab[i].blk_dev; i++) {
+ if (!(fstab[i].fs_mgr_flags & MF_CRYPT)) {
+ continue;
+ }
+
+ /* We found a match */
+ if (key_loc) {
+ strlcpy(key_loc, fstab[i].key_loc, size);
+ }
+ if (real_blk_dev) {
+ strlcpy(real_blk_dev, fstab[i].blk_dev, size);
+ }
+ break;
+ }
+
+ free_fstab(fstab);
+ return 0;
+}
+