eessppeelllloo/cryptsetup
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Add backend support for new device-mapper kernel options.

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This patch adds support for using keyring for volume key
and support for new integrity fields for dm-crypt.

Also helpers for searching disk by id.

To be used later.
This commit is contained in:
Milan Broz
2017-09-24 12:00:05 +02:00
parent 894e7b9357
commit c56bdee177
14 changed files with 606 additions and 37 deletions
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85
lib/utils_devpath.c
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@@ -371,3 +371,88 @@ char *crypt_get_base_device(const char *dev_path)
snprintf(part_path, sizeof(part_path), "/dev/%s", devname);
return strdup(part_path);
}
int lookup_by_disk_id(const char *dm_uuid)
{
struct dirent *entry;
struct stat st;
int r = 0; /* not found */
DIR *dir = opendir("/dev/disk/by-id");
if (!dir)
/* map ENOTDIR to ENOENT we'll handle both errors same */
return errno == ENOTDIR ? -ENOENT : -errno;
while ((entry = readdir(dir))) {
if (entry->d_name[0] == '.' ||
!strncmp(entry->d_name, "..", 2))
continue;
if (fstatat(dirfd(dir), entry->d_name, &st, AT_SYMLINK_NOFOLLOW)) {
r = -EINVAL;
break;
}
if (!S_ISREG(st.st_mode) && !S_ISLNK(st.st_mode))
continue;
if (!strncmp(entry->d_name, dm_uuid, strlen(dm_uuid))) {
r = 1;
break;
}
}
closedir(dir);
return r;
}
int lookup_by_sysfs_uuid_field(const char *dm_uuid, size_t max_len)
{
struct dirent *entry;
char subpath[PATH_MAX], uuid[max_len];
ssize_t s;
struct stat st;
int fd, len, r = 0; /* not found */
DIR *dir = opendir("/sys/block/");
if (!dir)
/* map ENOTDIR to ENOENT we'll handle both errors same */
return errno == ENOTDIR ? -ENOENT : -errno;
while (r != 1 && (entry = readdir(dir))) {
if (entry->d_name[0] == '.' ||
!strncmp(entry->d_name, "..", 2))
continue;
len = snprintf(subpath, PATH_MAX, "%s/%s", entry->d_name, "dm/uuid");
if (len < 0 || len >= PATH_MAX) {
r = -EINVAL;
break;
}
/* looking for dm-X/dm/uuid file, symlinks are fine */
fd = openat(dirfd(dir), subpath, O_RDONLY | O_CLOEXEC);
if (fd < 0)
continue;
if (fstat(fd, &st) || !S_ISREG(st.st_mode)) {
close(fd);
continue;
}
/* reads binary data */
s = read_buffer(fd, uuid, max_len - 1);
if (s > 0) {
uuid[s] = '\0';
if (!strncmp(uuid, dm_uuid, strlen(dm_uuid)))
r = 1;
}
close(fd);
}
closedir(dir);
return r;
}