diff options
| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 13:00:47 +0000 |
| commit | 2cb7e0aaedad73b076ea18c6900b0e86c5760d79 (patch) | |
| tree | da68ca54bb79f4080079bf0828acda937593a4e1 /src/shared/dissect-image.c | |
| parent | Initial commit. (diff) | |
| download | systemd-2cb7e0aaedad73b076ea18c6900b0e86c5760d79.tar.xz systemd-2cb7e0aaedad73b076ea18c6900b0e86c5760d79.zip | |
Adding upstream version 247.3.upstream/247.3upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/shared/dissect-image.c')
| -rw-r--r-- | src/shared/dissect-image.c | 2557 |
1 files changed, 2557 insertions, 0 deletions
diff --git a/src/shared/dissect-image.c b/src/shared/dissect-image.c new file mode 100644 index 0000000..d1f299a --- /dev/null +++ b/src/shared/dissect-image.c @@ -0,0 +1,2557 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#if HAVE_VALGRIND_MEMCHECK_H +#include <valgrind/memcheck.h> +#endif + +#include <linux/dm-ioctl.h> +#include <linux/loop.h> +#include <sys/mount.h> +#include <sys/prctl.h> +#include <sys/wait.h> +#include <sysexits.h> + +#include "sd-device.h" +#include "sd-id128.h" + +#include "architecture.h" +#include "ask-password-api.h" +#include "blkid-util.h" +#include "blockdev-util.h" +#include "copy.h" +#include "cryptsetup-util.h" +#include "def.h" +#include "device-nodes.h" +#include "device-util.h" +#include "dissect-image.h" +#include "dm-util.h" +#include "env-file.h" +#include "fd-util.h" +#include "fileio.h" +#include "fs-util.h" +#include "fsck-util.h" +#include "gpt.h" +#include "hexdecoct.h" +#include "hostname-util.h" +#include "id128-util.h" +#include "mkdir.h" +#include "mount-util.h" +#include "mountpoint-util.h" +#include "namespace-util.h" +#include "nulstr-util.h" +#include "os-util.h" +#include "path-util.h" +#include "process-util.h" +#include "raw-clone.h" +#include "signal-util.h" +#include "stat-util.h" +#include "stdio-util.h" +#include "string-table.h" +#include "string-util.h" +#include "strv.h" +#include "tmpfile-util.h" +#include "udev-util.h" +#include "user-util.h" +#include "xattr-util.h" + +/* how many times to wait for the device nodes to appear */ +#define N_DEVICE_NODE_LIST_ATTEMPTS 10 + +int probe_filesystem(const char *node, char **ret_fstype) { + /* Try to find device content type and return it in *ret_fstype. If nothing is found, + * 0/NULL will be returned. -EUCLEAN will be returned for ambiguous results, and an + * different error otherwise. */ + +#if HAVE_BLKID + _cleanup_(blkid_free_probep) blkid_probe b = NULL; + const char *fstype; + int r; + + errno = 0; + b = blkid_new_probe_from_filename(node); + if (!b) + return errno_or_else(ENOMEM); + + blkid_probe_enable_superblocks(b, 1); + blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE); + + errno = 0; + r = blkid_do_safeprobe(b); + if (r == 1) { + log_debug("No type detected on partition %s", node); + goto not_found; + } + if (r == -2) + return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN), + "Results ambiguous for partition %s", node); + if (r != 0) + return errno_or_else(EIO); + + (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); + + if (fstype) { + char *t; + + t = strdup(fstype); + if (!t) + return -ENOMEM; + + *ret_fstype = t; + return 1; + } + +not_found: + *ret_fstype = NULL; + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +#if HAVE_BLKID +static int enumerator_for_parent(sd_device *d, sd_device_enumerator **ret) { + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + int r; + + assert(d); + assert(ret); + + r = sd_device_enumerator_new(&e); + if (r < 0) + return r; + + r = sd_device_enumerator_allow_uninitialized(e); + if (r < 0) + return r; + + r = sd_device_enumerator_add_match_parent(e, d); + if (r < 0) + return r; + + *ret = TAKE_PTR(e); + return 0; +} + +static int device_is_partition(sd_device *d, blkid_partition pp) { + blkid_loff_t bsize, bstart; + uint64_t size, start; + int partno, bpartno, r; + const char *ss, *v; + + assert(d); + assert(pp); + + r = sd_device_get_subsystem(d, &ss); + if (r < 0) + return r; + if (!streq(ss, "block")) + return false; + + r = sd_device_get_sysattr_value(d, "partition", &v); + if (r == -ENOENT) /* Not a partition device */ + return false; + if (r < 0) + return r; + r = safe_atoi(v, &partno); + if (r < 0) + return r; + + errno = 0; + bpartno = blkid_partition_get_partno(pp); + if (bpartno < 0) + return errno_or_else(EIO); + + if (partno != bpartno) + return false; + + r = sd_device_get_sysattr_value(d, "start", &v); + if (r < 0) + return r; + r = safe_atou64(v, &start); + if (r < 0) + return r; + + errno = 0; + bstart = blkid_partition_get_start(pp); + if (bstart < 0) + return errno_or_else(EIO); + + if (start != (uint64_t) bstart) + return false; + + r = sd_device_get_sysattr_value(d, "size", &v); + if (r < 0) + return r; + r = safe_atou64(v, &size); + if (r < 0) + return r; + + errno = 0; + bsize = blkid_partition_get_size(pp); + if (bsize < 0) + return errno_or_else(EIO); + + if (size != (uint64_t) bsize) + return false; + + return true; +} + +static int find_partition( + sd_device *parent, + blkid_partition pp, + sd_device **ret) { + + _cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL; + sd_device *q; + int r; + + assert(parent); + assert(pp); + assert(ret); + + r = enumerator_for_parent(parent, &e); + if (r < 0) + return r; + + FOREACH_DEVICE(e, q) { + r = device_is_partition(q, pp); + if (r < 0) + return r; + if (r > 0) { + *ret = sd_device_ref(q); + return 0; + } + } + + return -ENXIO; +} + +struct wait_data { + sd_device *parent_device; + blkid_partition blkidp; + sd_device *found; +}; + +static inline void wait_data_done(struct wait_data *d) { + sd_device_unref(d->found); +} + +static int device_monitor_handler(sd_device_monitor *monitor, sd_device *device, void *userdata) { + const char *parent1_path, *parent2_path; + struct wait_data *w = userdata; + sd_device *pp; + int r; + + assert(w); + + if (device_for_action(device, DEVICE_ACTION_REMOVE)) + return 0; + + r = sd_device_get_parent(device, &pp); + if (r < 0) + return 0; /* Doesn't have a parent? No relevant to us */ + + r = sd_device_get_syspath(pp, &parent1_path); /* Check parent of device of this action */ + if (r < 0) + goto finish; + + r = sd_device_get_syspath(w->parent_device, &parent2_path); /* Check parent of device we are looking for */ + if (r < 0) + goto finish; + + if (!path_equal(parent1_path, parent2_path)) + return 0; /* Has a different parent than what we need, not interesting to us */ + + r = device_is_partition(device, w->blkidp); + if (r < 0) + goto finish; + if (r == 0) /* Not the one we need */ + return 0; + + /* It's the one we need! Yay! */ + assert(!w->found); + w->found = sd_device_ref(device); + r = 0; + +finish: + return sd_event_exit(sd_device_monitor_get_event(monitor), r); +} + +static int wait_for_partition_device( + sd_device *parent, + blkid_partition pp, + usec_t deadline, + sd_device **ret) { + + _cleanup_(sd_event_source_unrefp) sd_event_source *timeout_source = NULL; + _cleanup_(sd_device_monitor_unrefp) sd_device_monitor *monitor = NULL; + _cleanup_(sd_event_unrefp) sd_event *event = NULL; + int r; + + assert(parent); + assert(pp); + assert(ret); + + r = find_partition(parent, pp, ret); + if (r != -ENXIO) + return r; + + r = sd_event_new(&event); + if (r < 0) + return r; + + r = sd_device_monitor_new(&monitor); + if (r < 0) + return r; + + r = sd_device_monitor_filter_add_match_subsystem_devtype(monitor, "block", "partition"); + if (r < 0) + return r; + + r = sd_device_monitor_attach_event(monitor, event); + if (r < 0) + return r; + + _cleanup_(wait_data_done) struct wait_data w = { + .parent_device = parent, + .blkidp = pp, + }; + + r = sd_device_monitor_start(monitor, device_monitor_handler, &w); + if (r < 0) + return r; + + /* Check again, the partition might have appeared in the meantime */ + r = find_partition(parent, pp, ret); + if (r != -ENXIO) + return r; + + if (deadline != USEC_INFINITY) { + r = sd_event_add_time( + event, &timeout_source, + CLOCK_MONOTONIC, deadline, 0, + NULL, INT_TO_PTR(-ETIMEDOUT)); + if (r < 0) + return r; + } + + r = sd_event_loop(event); + if (r < 0) + return r; + + assert(w.found); + *ret = TAKE_PTR(w.found); + return 0; +} + +static void check_partition_flags( + const char *node, + unsigned long long pflags, + unsigned long long supported) { + + assert(node); + + /* Mask away all flags supported by this partition's type and the three flags the UEFI spec defines generically */ + pflags &= ~(supported | GPT_FLAG_REQUIRED_PARTITION | GPT_FLAG_NO_BLOCK_IO_PROTOCOL | GPT_FLAG_LEGACY_BIOS_BOOTABLE); + + if (pflags == 0) + return; + + /* If there are other bits set, then log about it, to make things discoverable */ + for (unsigned i = 0; i < sizeof(pflags) * 8; i++) { + unsigned long long bit = 1ULL << i; + if (!FLAGS_SET(pflags, bit)) + continue; + + log_debug("Unexpected partition flag %llu set on %s!", bit, node); + } +} + +static int device_wait_for_initialization_harder( + sd_device *device, + const char *subsystem, + usec_t deadline, + sd_device **ret) { + + _cleanup_free_ char *uevent = NULL; + usec_t start, left, retrigger_timeout; + int r; + + start = now(CLOCK_MONOTONIC); + left = usec_sub_unsigned(deadline, start); + + if (DEBUG_LOGGING) { + char buf[FORMAT_TIMESPAN_MAX]; + const char *sn = NULL; + + (void) sd_device_get_sysname(device, &sn); + log_debug("Waiting for device '%s' to initialize for %s.", strna(sn), format_timespan(buf, sizeof(buf), left, 0)); + } + + if (left != USEC_INFINITY) + retrigger_timeout = CLAMP(left / 4, 1 * USEC_PER_SEC, 5 * USEC_PER_SEC); /* A fourth of the total timeout, but let's clamp to 1s…5s range */ + else + retrigger_timeout = 2 * USEC_PER_SEC; + + for (;;) { + usec_t local_deadline, n; + bool last_try; + + n = now(CLOCK_MONOTONIC); + assert(n >= start); + + /* Find next deadline, when we'll retrigger */ + local_deadline = start + + DIV_ROUND_UP(n - start, retrigger_timeout) * retrigger_timeout; + + if (deadline != USEC_INFINITY && deadline <= local_deadline) { + local_deadline = deadline; + last_try = true; + } else + last_try = false; + + r = device_wait_for_initialization(device, subsystem, local_deadline, ret); + if (r >= 0 && DEBUG_LOGGING) { + char buf[FORMAT_TIMESPAN_MAX]; + const char *sn = NULL; + + (void) sd_device_get_sysname(device, &sn); + log_debug("Successfully waited for device '%s' to initialize for %s.", strna(sn), format_timespan(buf, sizeof(buf), usec_sub_unsigned(now(CLOCK_MONOTONIC), start), 0)); + + } + if (r != -ETIMEDOUT || last_try) + return r; + + if (!uevent) { + const char *syspath; + + r = sd_device_get_syspath(device, &syspath); + if (r < 0) + return r; + + uevent = path_join(syspath, "uevent"); + if (!uevent) + return -ENOMEM; + } + + if (DEBUG_LOGGING) { + char buf[FORMAT_TIMESPAN_MAX]; + + log_debug("Device didn't initialize within %s, assuming lost event. Retriggering device through %s.", + format_timespan(buf, sizeof(buf), usec_sub_unsigned(now(CLOCK_MONOTONIC), start), 0), + uevent); + } + + r = write_string_file(uevent, "change", WRITE_STRING_FILE_DISABLE_BUFFER); + if (r < 0) + return r; + } +} +#endif + +#define DEVICE_TIMEOUT_USEC (45 * USEC_PER_SEC) + +int dissect_image( + int fd, + const VeritySettings *verity, + const MountOptions *mount_options, + DissectImageFlags flags, + DissectedImage **ret) { + +#if HAVE_BLKID +#ifdef GPT_ROOT_NATIVE + sd_id128_t root_uuid = SD_ID128_NULL, root_verity_uuid = SD_ID128_NULL; +#endif +#ifdef GPT_USR_NATIVE + sd_id128_t usr_uuid = SD_ID128_NULL, usr_verity_uuid = SD_ID128_NULL; +#endif + bool is_gpt, is_mbr, generic_rw, multiple_generic = false; + _cleanup_(sd_device_unrefp) sd_device *d = NULL; + _cleanup_(dissected_image_unrefp) DissectedImage *m = NULL; + _cleanup_(blkid_free_probep) blkid_probe b = NULL; + _cleanup_free_ char *generic_node = NULL; + sd_id128_t generic_uuid = SD_ID128_NULL; + const char *pttype = NULL; + blkid_partlist pl; + int r, generic_nr, n_partitions; + struct stat st; + usec_t deadline; + + assert(fd >= 0); + assert(ret); + assert(!verity || verity->root_hash || verity->root_hash_size == 0); + assert(!((flags & DISSECT_IMAGE_GPT_ONLY) && (flags & DISSECT_IMAGE_NO_PARTITION_TABLE))); + + /* Probes a disk image, and returns information about what it found in *ret. + * + * Returns -ENOPKG if no suitable partition table or file system could be found. + * Returns -EADDRNOTAVAIL if a root hash was specified but no matching root/verity partitions found. */ + + if (verity && verity->root_hash) { + sd_id128_t fsuuid, vuuid; + + /* If a root hash is supplied, then we use the root partition that has a UUID that match the + * first 128bit of the root hash. And we use the verity partition that has a UUID that match + * the final 128bit. */ + + if (verity->root_hash_size < sizeof(sd_id128_t)) + return -EINVAL; + + memcpy(&fsuuid, verity->root_hash, sizeof(sd_id128_t)); + memcpy(&vuuid, (const uint8_t*) verity->root_hash + verity->root_hash_size - sizeof(sd_id128_t), sizeof(sd_id128_t)); + + if (sd_id128_is_null(fsuuid)) + return -EINVAL; + if (sd_id128_is_null(vuuid)) + return -EINVAL; + + /* If the verity data declares it's for the /usr partition, then search for that, in all + * other cases assume it's for the root partition. */ +#ifdef GPT_USR_NATIVE + if (verity->designator == PARTITION_USR) { + usr_uuid = fsuuid; + usr_verity_uuid = vuuid; + } else { +#endif +#ifdef GPT_ROOT_NATIVE + root_uuid = fsuuid; + root_verity_uuid = vuuid; +#endif +#ifdef GPT_USR_NATIVE + } +#endif + } + + if (fstat(fd, &st) < 0) + return -errno; + + if (!S_ISBLK(st.st_mode)) + return -ENOTBLK; + + r = sd_device_new_from_devnum(&d, 'b', st.st_rdev); + if (r < 0) + return r; + + if (!FLAGS_SET(flags, DISSECT_IMAGE_NO_UDEV)) { + _cleanup_(sd_device_unrefp) sd_device *initialized = NULL; + + /* If udev support is enabled, then let's wait for the device to be initialized before we doing anything. */ + + r = device_wait_for_initialization_harder( + d, + "block", + usec_add(now(CLOCK_MONOTONIC), DEVICE_TIMEOUT_USEC), + &initialized); + if (r < 0) + return r; + + sd_device_unref(d); + d = TAKE_PTR(initialized); + } + + b = blkid_new_probe(); + if (!b) + return -ENOMEM; + + errno = 0; + r = blkid_probe_set_device(b, fd, 0, 0); + if (r != 0) + return errno_or_else(ENOMEM); + + if ((flags & DISSECT_IMAGE_GPT_ONLY) == 0) { + /* Look for file system superblocks, unless we only shall look for GPT partition tables */ + blkid_probe_enable_superblocks(b, 1); + blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE|BLKID_SUBLKS_USAGE); + } + + blkid_probe_enable_partitions(b, 1); + blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS); + + errno = 0; + r = blkid_do_safeprobe(b); + if (IN_SET(r, -2, 1)) + return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table."); + if (r != 0) + return errno_or_else(EIO); + + m = new0(DissectedImage, 1); + if (!m) + return -ENOMEM; + + if ((!(flags & DISSECT_IMAGE_GPT_ONLY) && + (flags & DISSECT_IMAGE_REQUIRE_ROOT)) || + (flags & DISSECT_IMAGE_NO_PARTITION_TABLE)) { + const char *usage = NULL; + + /* If flags permit this, also allow using non-partitioned single-filesystem images */ + + (void) blkid_probe_lookup_value(b, "USAGE", &usage, NULL); + if (STRPTR_IN_SET(usage, "filesystem", "crypto")) { + const char *fstype = NULL, *options = NULL, *devname = NULL; + _cleanup_free_ char *t = NULL, *n = NULL, *o = NULL; + + /* OK, we have found a file system, that's our root partition then. */ + (void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL); + + if (fstype) { + t = strdup(fstype); + if (!t) + return -ENOMEM; + } + + r = sd_device_get_devname(d, &devname); + if (r < 0) + return r; + + n = strdup(devname); + if (!n) + return -ENOMEM; + + m->single_file_system = true; + m->verity = verity && verity->root_hash && verity->data_path && (verity->designator < 0 || verity->designator == PARTITION_ROOT); + m->can_verity = verity && verity->data_path; + + options = mount_options_from_designator(mount_options, PARTITION_ROOT); + if (options) { + o = strdup(options); + if (!o) + return -ENOMEM; + } + + m->partitions[PARTITION_ROOT] = (DissectedPartition) { + .found = true, + .rw = !m->verity, + .partno = -1, + .architecture = _ARCHITECTURE_INVALID, + .fstype = TAKE_PTR(t), + .node = TAKE_PTR(n), + .mount_options = TAKE_PTR(o), + }; + + m->encrypted = streq_ptr(fstype, "crypto_LUKS"); + + *ret = TAKE_PTR(m); + return 0; + } + } + + (void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL); + if (!pttype) + return -ENOPKG; + + is_gpt = streq_ptr(pttype, "gpt"); + is_mbr = streq_ptr(pttype, "dos"); + + if (!is_gpt && ((flags & DISSECT_IMAGE_GPT_ONLY) || !is_mbr)) + return -ENOPKG; + + /* Safety check: refuse block devices that carry a partition table but for which the kernel doesn't + * do partition scanning. */ + r = blockdev_partscan_enabled(fd); + if (r < 0) + return r; + if (r == 0) + return -EPROTONOSUPPORT; + + errno = 0; + pl = blkid_probe_get_partitions(b); + if (!pl) + return errno_or_else(ENOMEM); + + errno = 0; + n_partitions = blkid_partlist_numof_partitions(pl); + if (n_partitions < 0) + return errno_or_else(EIO); + + deadline = usec_add(now(CLOCK_MONOTONIC), DEVICE_TIMEOUT_USEC); + for (int i = 0; i < n_partitions; i++) { + _cleanup_(sd_device_unrefp) sd_device *q = NULL; + unsigned long long pflags; + blkid_partition pp; + const char *node; + int nr; + + errno = 0; + pp = blkid_partlist_get_partition(pl, i); + if (!pp) + return errno_or_else(EIO); + + r = wait_for_partition_device(d, pp, deadline, &q); + if (r < 0) + return r; + + r = sd_device_get_devname(q, &node); + if (r < 0) + return r; + + pflags = blkid_partition_get_flags(pp); + + errno = 0; + nr = blkid_partition_get_partno(pp); + if (nr < 0) + return errno_or_else(EIO); + + if (is_gpt) { + PartitionDesignator designator = _PARTITION_DESIGNATOR_INVALID; + int architecture = _ARCHITECTURE_INVALID; + const char *stype, *sid, *fstype = NULL; + sd_id128_t type_id, id; + bool rw = true; + + sid = blkid_partition_get_uuid(pp); + if (!sid) + continue; + if (sd_id128_from_string(sid, &id) < 0) + continue; + + stype = blkid_partition_get_type_string(pp); + if (!stype) + continue; + if (sd_id128_from_string(stype, &type_id) < 0) + continue; + + if (sd_id128_equal(type_id, GPT_HOME)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + designator = PARTITION_HOME; + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_SRV)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + designator = PARTITION_SRV; + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_ESP)) { + + /* Note that we don't check the GPT_FLAG_NO_AUTO flag for the ESP, as it is + * not defined there. We instead check the GPT_FLAG_NO_BLOCK_IO_PROTOCOL, as + * recommended by the UEFI spec (See "12.3.3 Number and Location of System + * Partitions"). */ + + if (pflags & GPT_FLAG_NO_BLOCK_IO_PROTOCOL) + continue; + + designator = PARTITION_ESP; + fstype = "vfat"; + + } else if (sd_id128_equal(type_id, GPT_XBOOTLDR)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + designator = PARTITION_XBOOTLDR; + rw = !(pflags & GPT_FLAG_READ_ONLY); + } +#ifdef GPT_ROOT_NATIVE + else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + /* If a root ID is specified, ignore everything but the root id */ + if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) + continue; + + designator = PARTITION_ROOT; + architecture = native_architecture(); + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_ROOT_NATIVE_VERITY)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + m->can_verity = true; + + /* Ignore verity unless a root hash is specified */ + if (sd_id128_is_null(root_verity_uuid) || !sd_id128_equal(root_verity_uuid, id)) + continue; + + designator = PARTITION_ROOT_VERITY; + fstype = "DM_verity_hash"; + architecture = native_architecture(); + rw = false; + } +#endif +#ifdef GPT_ROOT_SECONDARY + else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + /* If a root ID is specified, ignore everything but the root id */ + if (!sd_id128_is_null(root_uuid) && !sd_id128_equal(root_uuid, id)) + continue; + + designator = PARTITION_ROOT_SECONDARY; + architecture = SECONDARY_ARCHITECTURE; + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_ROOT_SECONDARY_VERITY)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + m->can_verity = true; + + /* Ignore verity unless root has is specified */ + if (sd_id128_is_null(root_verity_uuid) || !sd_id128_equal(root_verity_uuid, id)) + continue; + + designator = PARTITION_ROOT_SECONDARY_VERITY; + fstype = "DM_verity_hash"; + architecture = SECONDARY_ARCHITECTURE; + rw = false; + } +#endif +#ifdef GPT_USR_NATIVE + else if (sd_id128_equal(type_id, GPT_USR_NATIVE)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + /* If a usr ID is specified, ignore everything but the usr id */ + if (!sd_id128_is_null(usr_uuid) && !sd_id128_equal(usr_uuid, id)) + continue; + + designator = PARTITION_USR; + architecture = native_architecture(); + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_USR_NATIVE_VERITY)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + m->can_verity = true; + + /* Ignore verity unless a usr hash is specified */ + if (sd_id128_is_null(usr_verity_uuid) || !sd_id128_equal(usr_verity_uuid, id)) + continue; + + designator = PARTITION_USR_VERITY; + fstype = "DM_verity_hash"; + architecture = native_architecture(); + rw = false; + } +#endif +#ifdef GPT_USR_SECONDARY + else if (sd_id128_equal(type_id, GPT_USR_SECONDARY)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + /* If a usr ID is specified, ignore everything but the usr id */ + if (!sd_id128_is_null(usr_uuid) && !sd_id128_equal(usr_uuid, id)) + continue; + + designator = PARTITION_USR_SECONDARY; + architecture = SECONDARY_ARCHITECTURE; + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_USR_SECONDARY_VERITY)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + m->can_verity = true; + + /* Ignore verity unless usr has is specified */ + if (sd_id128_is_null(usr_verity_uuid) || !sd_id128_equal(usr_verity_uuid, id)) + continue; + + designator = PARTITION_USR_SECONDARY_VERITY; + fstype = "DM_verity_hash"; + architecture = SECONDARY_ARCHITECTURE; + rw = false; + } +#endif + else if (sd_id128_equal(type_id, GPT_SWAP)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + designator = PARTITION_SWAP; + fstype = "swap"; + + } else if (sd_id128_equal(type_id, GPT_LINUX_GENERIC)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + if (generic_node) + multiple_generic = true; + else { + generic_nr = nr; + generic_rw = !(pflags & GPT_FLAG_READ_ONLY); + generic_uuid = id; + generic_node = strdup(node); + if (!generic_node) + return -ENOMEM; + } + + } else if (sd_id128_equal(type_id, GPT_TMP)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + designator = PARTITION_TMP; + rw = !(pflags & GPT_FLAG_READ_ONLY); + + } else if (sd_id128_equal(type_id, GPT_VAR)) { + + check_partition_flags(node, pflags, GPT_FLAG_NO_AUTO|GPT_FLAG_READ_ONLY); + + if (pflags & GPT_FLAG_NO_AUTO) + continue; + + if (!FLAGS_SET(flags, DISSECT_IMAGE_RELAX_VAR_CHECK)) { + sd_id128_t var_uuid; + + /* For /var we insist that the uuid of the partition matches the + * HMAC-SHA256 of the /var GPT partition type uuid, keyed by machine + * ID. Why? Unlike the other partitions /var is inherently + * installation specific, hence we need to be careful not to mount it + * in the wrong installation. By hashing the partition UUID from + * /etc/machine-id we can securely bind the partition to the + * installation. */ + + r = sd_id128_get_machine_app_specific(GPT_VAR, &var_uuid); + if (r < 0) + return r; + + if (!sd_id128_equal(var_uuid, id)) { + log_debug("Found a /var/ partition, but its UUID didn't match our expectations, ignoring."); + continue; + } + } + + designator = PARTITION_VAR; + rw = !(pflags & GPT_FLAG_READ_ONLY); + } + + if (designator != _PARTITION_DESIGNATOR_INVALID) { + _cleanup_free_ char *t = NULL, *n = NULL, *o = NULL; + const char *options = NULL; + + /* First one wins */ + if (m->partitions[designator].found) + continue; + + if (fstype) { + t = strdup(fstype); + if (!t) + return -ENOMEM; + } + + n = strdup(node); + if (!n) + return -ENOMEM; + + options = mount_options_from_designator(mount_options, designator); + if (options) { + o = strdup(options); + if (!o) + return -ENOMEM; + } + + m->partitions[designator] = (DissectedPartition) { + .found = true, + .partno = nr, + .rw = rw, + .architecture = architecture, + .node = TAKE_PTR(n), + .fstype = TAKE_PTR(t), + .uuid = id, + .mount_options = TAKE_PTR(o), + }; + } + + } else if (is_mbr) { + + switch (blkid_partition_get_type(pp)) { + + case 0x83: /* Linux partition */ + + if (pflags != 0x80) /* Bootable flag */ + continue; + + if (generic_node) + multiple_generic = true; + else { + generic_nr = nr; + generic_rw = true; + generic_node = strdup(node); + if (!generic_node) + return -ENOMEM; + } + + break; + + case 0xEA: { /* Boot Loader Spec extended $BOOT partition */ + _cleanup_free_ char *n = NULL, *o = NULL; + sd_id128_t id = SD_ID128_NULL; + const char *sid, *options = NULL; + + /* First one wins */ + if (m->partitions[PARTITION_XBOOTLDR].found) + continue; + + sid = blkid_partition_get_uuid(pp); + if (sid) + (void) sd_id128_from_string(sid, &id); + + n = strdup(node); + if (!n) + return -ENOMEM; + + options = mount_options_from_designator(mount_options, PARTITION_XBOOTLDR); + if (options) { + o = strdup(options); + if (!o) + return -ENOMEM; + } + + m->partitions[PARTITION_XBOOTLDR] = (DissectedPartition) { + .found = true, + .partno = nr, + .rw = true, + .architecture = _ARCHITECTURE_INVALID, + .node = TAKE_PTR(n), + .uuid = id, + .mount_options = TAKE_PTR(o), + }; + + break; + }} + } + } + + if (m->partitions[PARTITION_ROOT].found) { + /* If we found the primary arch, then invalidate the secondary arch to avoid any ambiguities, + * since we never want to mount the secondary arch in this case. */ + m->partitions[PARTITION_ROOT_SECONDARY].found = false; + m->partitions[PARTITION_ROOT_SECONDARY_VERITY].found = false; + m->partitions[PARTITION_USR_SECONDARY].found = false; + m->partitions[PARTITION_USR_SECONDARY_VERITY].found = false; + } else { + /* No root partition found? Then let's see if ther's one for the secondary architecture. And if not + * either, then check if there's a single generic one, and use that. */ + + if (m->partitions[PARTITION_ROOT_VERITY].found) + return -EADDRNOTAVAIL; + + /* We didn't find a primary architecture root, but we found a primary architecture /usr? Refuse that for now. */ + if (m->partitions[PARTITION_USR].found || m->partitions[PARTITION_USR_VERITY].found) + return -EADDRNOTAVAIL; + + if (m->partitions[PARTITION_ROOT_SECONDARY].found) { + /* Upgrade secondary arch to first */ + m->partitions[PARTITION_ROOT] = m->partitions[PARTITION_ROOT_SECONDARY]; + zero(m->partitions[PARTITION_ROOT_SECONDARY]); + m->partitions[PARTITION_ROOT_VERITY] = m->partitions[PARTITION_ROOT_SECONDARY_VERITY]; + zero(m->partitions[PARTITION_ROOT_SECONDARY_VERITY]); + + m->partitions[PARTITION_USR] = m->partitions[PARTITION_USR_SECONDARY]; + zero(m->partitions[PARTITION_USR_SECONDARY]); + m->partitions[PARTITION_USR_VERITY] = m->partitions[PARTITION_USR_SECONDARY_VERITY]; + zero(m->partitions[PARTITION_USR_SECONDARY_VERITY]); + + } else if (flags & DISSECT_IMAGE_REQUIRE_ROOT) { + _cleanup_free_ char *o = NULL; + const char *options = NULL; + + /* If the root hash was set, then we won't fall back to a generic node, because the + * root hash decides. */ + if (verity && verity->root_hash) + return -EADDRNOTAVAIL; + + /* If we didn't find a generic node, then we can't fix this up either */ + if (!generic_node) + return -ENXIO; + + /* If we didn't find a properly marked root partition, but we did find a single suitable + * generic Linux partition, then use this as root partition, if the caller asked for it. */ + if (multiple_generic) + return -ENOTUNIQ; + + options = mount_options_from_designator(mount_options, PARTITION_ROOT); + if (options) { + o = strdup(options); + if (!o) + return -ENOMEM; + } + + m->partitions[PARTITION_ROOT] = (DissectedPartition) { + .found = true, + .rw = generic_rw, + .partno = generic_nr, + .architecture = _ARCHITECTURE_INVALID, + .node = TAKE_PTR(generic_node), + .uuid = generic_uuid, + .mount_options = TAKE_PTR(o), + }; + } + } + + /* Refuse if we found a verity partition for /usr but no matching file system partition */ + if (!m->partitions[PARTITION_USR].found && m->partitions[PARTITION_USR_VERITY].found) + return -EADDRNOTAVAIL; + + /* Combinations of verity /usr with verity-less root is OK, but the reverse is not */ + if (m->partitions[PARTITION_ROOT_VERITY].found && m->partitions[PARTITION_USR].found && !m->partitions[PARTITION_USR_VERITY].found) + return -EADDRNOTAVAIL; + + if (verity && verity->root_hash) { + if (verity->designator < 0 || verity->designator == PARTITION_ROOT) { + if (!m->partitions[PARTITION_ROOT_VERITY].found || !m->partitions[PARTITION_ROOT].found) + return -EADDRNOTAVAIL; + + /* If we found a verity setup, then the root partition is necessarily read-only. */ + m->partitions[PARTITION_ROOT].rw = false; + m->verity = true; + } + + if (verity->designator == PARTITION_USR) { + if (!m->partitions[PARTITION_USR_VERITY].found || !m->partitions[PARTITION_USR].found) + return -EADDRNOTAVAIL; + + m->partitions[PARTITION_USR].rw = false; + m->verity = true; + } + } + + blkid_free_probe(b); + b = NULL; + + /* Fill in file system types if we don't know them yet. */ + for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { + DissectedPartition *p = m->partitions + i; + + if (!p->found) + continue; + + if (!p->fstype && p->node) { + r = probe_filesystem(p->node, &p->fstype); + if (r < 0 && r != -EUCLEAN) + return r; + } + + if (streq_ptr(p->fstype, "crypto_LUKS")) + m->encrypted = true; + + if (p->fstype && fstype_is_ro(p->fstype)) + p->rw = false; + } + + *ret = TAKE_PTR(m); + return 0; +#else + return -EOPNOTSUPP; +#endif +} + +DissectedImage* dissected_image_unref(DissectedImage *m) { + if (!m) + return NULL; + + for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { + free(m->partitions[i].fstype); + free(m->partitions[i].node); + free(m->partitions[i].decrypted_fstype); + free(m->partitions[i].decrypted_node); + free(m->partitions[i].mount_options); + } + + free(m->hostname); + strv_free(m->machine_info); + strv_free(m->os_release); + + return mfree(m); +} + +static int is_loop_device(const char *path) { + char s[SYS_BLOCK_PATH_MAX("/../loop/")]; + struct stat st; + + assert(path); + + if (stat(path, &st) < 0) + return -errno; + + if (!S_ISBLK(st.st_mode)) + return -ENOTBLK; + + xsprintf_sys_block_path(s, "/loop/", st.st_dev); + if (access(s, F_OK) < 0) { + if (errno != ENOENT) + return -errno; + + /* The device itself isn't a loop device, but maybe it's a partition and its parent is? */ + xsprintf_sys_block_path(s, "/../loop/", st.st_dev); + if (access(s, F_OK) < 0) + return errno == ENOENT ? false : -errno; + } + + return true; +} + +static int run_fsck(const char *node, const char *fstype) { + int r, exit_status; + pid_t pid; + + assert(node); + assert(fstype); + + r = fsck_exists(fstype); + if (r < 0) { + log_debug_errno(r, "Couldn't determine whether fsck for %s exists, proceeding anyway.", fstype); + return 0; + } + if (r == 0) { + log_debug("Not checking partition %s, as fsck for %s does not exist.", node, fstype); + return 0; + } + + r = safe_fork("(fsck)", FORK_RESET_SIGNALS|FORK_CLOSE_ALL_FDS|FORK_RLIMIT_NOFILE_SAFE|FORK_DEATHSIG|FORK_NULL_STDIO, &pid); + if (r < 0) + return log_debug_errno(r, "Failed to fork off fsck: %m"); + if (r == 0) { + /* Child */ + execl("/sbin/fsck", "/sbin/fsck", "-aT", node, NULL); + log_debug_errno(errno, "Failed to execl() fsck: %m"); + _exit(FSCK_OPERATIONAL_ERROR); + } + + exit_status = wait_for_terminate_and_check("fsck", pid, 0); + if (exit_status < 0) + return log_debug_errno(exit_status, "Failed to fork off /sbin/fsck: %m"); + + if ((exit_status & ~FSCK_ERROR_CORRECTED) != FSCK_SUCCESS) { + log_debug("fsck failed with exit status %i.", exit_status); + + if ((exit_status & (FSCK_SYSTEM_SHOULD_REBOOT|FSCK_ERRORS_LEFT_UNCORRECTED)) != 0) + return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN), "File system is corrupted, refusing."); + + log_debug("Ignoring fsck error."); + } + + return 0; +} + +static int mount_partition( + DissectedPartition *m, + const char *where, + const char *directory, + uid_t uid_shift, + DissectImageFlags flags) { + + _cleanup_free_ char *chased = NULL, *options = NULL; + const char *p, *node, *fstype; + bool rw; + int r; + + assert(m); + assert(where); + + /* Use decrypted node and matching fstype if available, otherwise use the original device */ + node = m->decrypted_node ?: m->node; + fstype = m->decrypted_node ? m->decrypted_fstype: m->fstype; + + if (!m->found || !node) + return 0; + if (!fstype) + return -EAFNOSUPPORT; + + /* We are looking at an encrypted partition? This either means stacked encryption, or the caller didn't call dissected_image_decrypt() beforehand. Let's return a recognizable error for this case. */ + if (streq(fstype, "crypto_LUKS")) + return -EUNATCH; + + rw = m->rw && !(flags & DISSECT_IMAGE_READ_ONLY); + + if (FLAGS_SET(flags, DISSECT_IMAGE_FSCK) && rw) { + r = run_fsck(node, fstype); + if (r < 0) + return r; + } + + if (directory) { + if (!FLAGS_SET(flags, DISSECT_IMAGE_READ_ONLY)) { + /* Automatically create missing mount points, if necessary. */ + r = mkdir_p_root(where, directory, uid_shift, (gid_t) uid_shift, 0755); + if (r < 0) + return r; + } + + r = chase_symlinks(directory, where, CHASE_PREFIX_ROOT, &chased, NULL); + if (r < 0) + return r; + + p = chased; + } else + p = where; + + /* If requested, turn on discard support. */ + if (fstype_can_discard(fstype) && + ((flags & DISSECT_IMAGE_DISCARD) || + ((flags & DISSECT_IMAGE_DISCARD_ON_LOOP) && is_loop_device(m->node) > 0))) { + options = strdup("discard"); + if (!options) + return -ENOMEM; + } + + if (uid_is_valid(uid_shift) && uid_shift != 0 && fstype_can_uid_gid(fstype)) { + _cleanup_free_ char *uid_option = NULL; + + if (asprintf(&uid_option, "uid=" UID_FMT ",gid=" GID_FMT, uid_shift, (gid_t) uid_shift) < 0) + return -ENOMEM; + + if (!strextend_with_separator(&options, ",", uid_option, NULL)) + return -ENOMEM; + } + + if (!isempty(m->mount_options)) + if (!strextend_with_separator(&options, ",", m->mount_options, NULL)) + return -ENOMEM; + + if (FLAGS_SET(flags, DISSECT_IMAGE_MKDIR)) { + r = mkdir_p(p, 0755); + if (r < 0) + return r; + } + + r = mount_nofollow_verbose(LOG_DEBUG, node, p, fstype, MS_NODEV|(rw ? 0 : MS_RDONLY), options); + if (r < 0) + return r; + + return 1; +} + +int dissected_image_mount(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) { + int r, xbootldr_mounted; + + assert(m); + assert(where); + + /* Returns: + * + * -ENXIO → No root partition found + * -EMEDIUMTYPE → DISSECT_IMAGE_VALIDATE_OS set but no os-release file found + * -EUNATCH → Encrypted partition found for which no dm-crypt was set up yet + * -EUCLEAN → fsck for file system failed + * -EBUSY → File system already mounted/used elsewhere (kernel) + * -EAFNOSUPPORT → File system type not supported or not known + */ + + if (!m->partitions[PARTITION_ROOT].found) + return -ENXIO; + + if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) { + r = mount_partition(m->partitions + PARTITION_ROOT, where, NULL, uid_shift, flags); + if (r < 0) + return r; + } + + /* Mask DISSECT_IMAGE_MKDIR for all subdirs: the idea is that only the top-level mount point is + * created if needed, but the image itself not modified. */ + flags &= ~DISSECT_IMAGE_MKDIR; + + if ((flags & DISSECT_IMAGE_MOUNT_NON_ROOT_ONLY) == 0) { + /* For us mounting root always means mounting /usr as well */ + r = mount_partition(m->partitions + PARTITION_USR, where, "/usr", uid_shift, flags); + if (r < 0) + return r; + + if (flags & DISSECT_IMAGE_VALIDATE_OS) { + r = path_is_os_tree(where); + if (r < 0) + return r; + if (r == 0) + return -EMEDIUMTYPE; + } + } + + if (flags & DISSECT_IMAGE_MOUNT_ROOT_ONLY) + return 0; + + r = mount_partition(m->partitions + PARTITION_HOME, where, "/home", uid_shift, flags); + if (r < 0) + return r; + + r = mount_partition(m->partitions + PARTITION_SRV, where, "/srv", uid_shift, flags); + if (r < 0) + return r; + + r = mount_partition(m->partitions + PARTITION_VAR, where, "/var", uid_shift, flags); + if (r < 0) + return r; + + r = mount_partition(m->partitions + PARTITION_TMP, where, "/var/tmp", uid_shift, flags); + if (r < 0) + return r; + + xbootldr_mounted = mount_partition(m->partitions + PARTITION_XBOOTLDR, where, "/boot", uid_shift, flags); + if (xbootldr_mounted < 0) + return xbootldr_mounted; + + if (m->partitions[PARTITION_ESP].found) { + int esp_done = false; + + /* Mount the ESP to /efi if it exists. If it doesn't exist, use /boot instead, but only if it + * exists and is empty, and we didn't already mount the XBOOTLDR partition into it. */ + + r = chase_symlinks("/efi", where, CHASE_PREFIX_ROOT, NULL, NULL); + if (r < 0) { + if (r != -ENOENT) + return r; + + /* /efi doesn't exist. Let's see if /boot is suitable then */ + + if (!xbootldr_mounted) { + _cleanup_free_ char *p = NULL; + + r = chase_symlinks("/boot", where, CHASE_PREFIX_ROOT, &p, NULL); + if (r < 0) { + if (r != -ENOENT) + return r; + } else if (dir_is_empty(p) > 0) { + /* It exists and is an empty directory. Let's mount the ESP there. */ + r = mount_partition(m->partitions + PARTITION_ESP, where, "/boot", uid_shift, flags); + if (r < 0) + return r; + + esp_done = true; + } + } + } + + if (!esp_done) { + /* OK, let's mount the ESP now to /efi (possibly creating the dir if missing) */ + + r = mount_partition(m->partitions + PARTITION_ESP, where, "/efi", uid_shift, flags); + if (r < 0) + return r; + } + } + + return 0; +} + +int dissected_image_mount_and_warn(DissectedImage *m, const char *where, uid_t uid_shift, DissectImageFlags flags) { + int r; + + assert(m); + assert(where); + + r = dissected_image_mount(m, where, uid_shift, flags); + if (r == -ENXIO) + return log_error_errno(r, "Not root file system found in image."); + if (r == -EMEDIUMTYPE) + return log_error_errno(r, "No suitable os-release file in image found."); + if (r == -EUNATCH) + return log_error_errno(r, "Encrypted file system discovered, but decryption not requested."); + if (r == -EUCLEAN) + return log_error_errno(r, "File system check on image failed."); + if (r == -EBUSY) + return log_error_errno(r, "File system already mounted elsewhere."); + if (r == -EAFNOSUPPORT) + return log_error_errno(r, "File system type not supported or not known."); + if (r < 0) + return log_error_errno(r, "Failed to mount image: %m"); + + return r; +} + +#if HAVE_LIBCRYPTSETUP +typedef struct DecryptedPartition { + struct crypt_device *device; + char *name; + bool relinquished; +} DecryptedPartition; + +struct DecryptedImage { + DecryptedPartition *decrypted; + size_t n_decrypted; + size_t n_allocated; +}; +#endif + +DecryptedImage* decrypted_image_unref(DecryptedImage* d) { +#if HAVE_LIBCRYPTSETUP + size_t i; + int r; + + if (!d) + return NULL; + + for (i = 0; i < d->n_decrypted; i++) { + DecryptedPartition *p = d->decrypted + i; + + if (p->device && p->name && !p->relinquished) { + r = sym_crypt_deactivate_by_name(p->device, p->name, 0); + if (r < 0) + log_debug_errno(r, "Failed to deactivate encrypted partition %s", p->name); + } + + if (p->device) + sym_crypt_free(p->device); + free(p->name); + } + + free(d); +#endif + return NULL; +} + +#if HAVE_LIBCRYPTSETUP + +static int make_dm_name_and_node(const void *original_node, const char *suffix, char **ret_name, char **ret_node) { + _cleanup_free_ char *name = NULL, *node = NULL; + const char *base; + + assert(original_node); + assert(suffix); + assert(ret_name); + assert(ret_node); + + base = strrchr(original_node, '/'); + if (!base) + base = original_node; + else + base++; + if (isempty(base)) + return -EINVAL; + + name = strjoin(base, suffix); + if (!name) + return -ENOMEM; + if (!filename_is_valid(name)) + return -EINVAL; + + node = path_join(sym_crypt_get_dir(), name); + if (!node) + return -ENOMEM; + + *ret_name = TAKE_PTR(name); + *ret_node = TAKE_PTR(node); + + return 0; +} + +static int decrypt_partition( + DissectedPartition *m, + const char *passphrase, + DissectImageFlags flags, + DecryptedImage *d) { + + _cleanup_free_ char *node = NULL, *name = NULL; + _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL; + int r; + + assert(m); + assert(d); + + if (!m->found || !m->node || !m->fstype) + return 0; + + if (!streq(m->fstype, "crypto_LUKS")) + return 0; + + if (!passphrase) + return -ENOKEY; + + r = dlopen_cryptsetup(); + if (r < 0) + return r; + + r = make_dm_name_and_node(m->node, "-decrypted", &name, &node); + if (r < 0) + return r; + + if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) + return -ENOMEM; + + r = sym_crypt_init(&cd, m->node); + if (r < 0) + return log_debug_errno(r, "Failed to initialize dm-crypt: %m"); + + cryptsetup_enable_logging(cd); + + r = sym_crypt_load(cd, CRYPT_LUKS, NULL); + if (r < 0) + return log_debug_errno(r, "Failed to load LUKS metadata: %m"); + + r = sym_crypt_activate_by_passphrase(cd, name, CRYPT_ANY_SLOT, passphrase, strlen(passphrase), + ((flags & DISSECT_IMAGE_READ_ONLY) ? CRYPT_ACTIVATE_READONLY : 0) | + ((flags & DISSECT_IMAGE_DISCARD_ON_CRYPTO) ? CRYPT_ACTIVATE_ALLOW_DISCARDS : 0)); + if (r < 0) { + log_debug_errno(r, "Failed to activate LUKS device: %m"); + return r == -EPERM ? -EKEYREJECTED : r; + } + + d->decrypted[d->n_decrypted++] = (DecryptedPartition) { + .name = TAKE_PTR(name), + .device = TAKE_PTR(cd), + }; + + m->decrypted_node = TAKE_PTR(node); + + return 0; +} + +static int verity_can_reuse( + const VeritySettings *verity, + const char *name, + struct crypt_device **ret_cd) { + + /* If the same volume was already open, check that the root hashes match, and reuse it if they do */ + _cleanup_free_ char *root_hash_existing = NULL; + _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL; + struct crypt_params_verity crypt_params = {}; + size_t root_hash_existing_size; + int r; + + assert(verity); + assert(name); + assert(ret_cd); + + r = sym_crypt_init_by_name(&cd, name); + if (r < 0) + return log_debug_errno(r, "Error opening verity device, crypt_init_by_name failed: %m"); + + r = sym_crypt_get_verity_info(cd, &crypt_params); + if (r < 0) + return log_debug_errno(r, "Error opening verity device, crypt_get_verity_info failed: %m"); + + root_hash_existing_size = verity->root_hash_size; + root_hash_existing = malloc0(root_hash_existing_size); + if (!root_hash_existing) + return -ENOMEM; + + r = sym_crypt_volume_key_get(cd, CRYPT_ANY_SLOT, root_hash_existing, &root_hash_existing_size, NULL, 0); + if (r < 0) + return log_debug_errno(r, "Error opening verity device, crypt_volume_key_get failed: %m"); + if (verity->root_hash_size != root_hash_existing_size || + memcmp(root_hash_existing, verity->root_hash, verity->root_hash_size) != 0) + return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but root hashes are different."); + +#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY + /* Ensure that, if signatures are supported, we only reuse the device if the previous mount used the + * same settings, so that a previous unsigned mount will not be reused if the user asks to use + * signing for the new one, and viceversa. */ + if (!!verity->root_hash_sig != !!(crypt_params.flags & CRYPT_VERITY_ROOT_HASH_SIGNATURE)) + return log_debug_errno(SYNTHETIC_ERRNO(EINVAL), "Error opening verity device, it already exists but signature settings are not the same."); +#endif + + *ret_cd = TAKE_PTR(cd); + return 0; +} + +static inline void dm_deferred_remove_clean(char *name) { + if (!name) + return; + + (void) sym_crypt_deactivate_by_name(NULL, name, CRYPT_DEACTIVATE_DEFERRED); + free(name); +} +DEFINE_TRIVIAL_CLEANUP_FUNC(char *, dm_deferred_remove_clean); + +static int verity_partition( + PartitionDesignator designator, + DissectedPartition *m, + DissectedPartition *v, + const VeritySettings *verity, + DissectImageFlags flags, + DecryptedImage *d) { + + _cleanup_(sym_crypt_freep) struct crypt_device *cd = NULL; + _cleanup_(dm_deferred_remove_cleanp) char *restore_deferred_remove = NULL; + _cleanup_free_ char *node = NULL, *name = NULL; + int r; + + assert(m); + assert(v || (verity && verity->data_path)); + + if (!verity || !verity->root_hash) + return 0; + if (!((verity->designator < 0 && designator == PARTITION_ROOT) || + (verity->designator == designator))) + return 0; + + if (!m->found || !m->node || !m->fstype) + return 0; + if (!verity->data_path) { + if (!v->found || !v->node || !v->fstype) + return 0; + + if (!streq(v->fstype, "DM_verity_hash")) + return 0; + } + + r = dlopen_cryptsetup(); + if (r < 0) + return r; + + if (FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) { + /* Use the roothash, which is unique per volume, as the device node name, so that it can be reused */ + _cleanup_free_ char *root_hash_encoded = NULL; + + root_hash_encoded = hexmem(verity->root_hash, verity->root_hash_size); + if (!root_hash_encoded) + return -ENOMEM; + + r = make_dm_name_and_node(root_hash_encoded, "-verity", &name, &node); + } else + r = make_dm_name_and_node(m->node, "-verity", &name, &node); + if (r < 0) + return r; + + r = sym_crypt_init(&cd, verity->data_path ?: v->node); + if (r < 0) + return r; + + cryptsetup_enable_logging(cd); + + r = sym_crypt_load(cd, CRYPT_VERITY, NULL); + if (r < 0) + return r; + + r = sym_crypt_set_data_device(cd, m->node); + if (r < 0) + return r; + + if (!GREEDY_REALLOC0(d->decrypted, d->n_allocated, d->n_decrypted + 1)) + return -ENOMEM; + + /* If activating fails because the device already exists, check the metadata and reuse it if it matches. + * In case of ENODEV/ENOENT, which can happen if another process is activating at the exact same time, + * retry a few times before giving up. */ + for (unsigned i = 0; i < N_DEVICE_NODE_LIST_ATTEMPTS; i++) { + if (verity->root_hash_sig) { +#if HAVE_CRYPT_ACTIVATE_BY_SIGNED_KEY + r = sym_crypt_activate_by_signed_key( + cd, + name, + verity->root_hash, + verity->root_hash_size, + verity->root_hash_sig, + verity->root_hash_sig_size, + CRYPT_ACTIVATE_READONLY); +#else + r = log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), + "Activation of verity device with signature requested, but not supported by %s due to missing crypt_activate_by_signed_key().", program_invocation_short_name); +#endif + } else + r = sym_crypt_activate_by_volume_key( + cd, + name, + verity->root_hash, + verity->root_hash_size, + CRYPT_ACTIVATE_READONLY); + /* libdevmapper can return EINVAL when the device is already in the activation stage. + * There's no way to distinguish this situation from a genuine error due to invalid + * parameters, so immediately fall back to activating the device with a unique name. + * Improvements in libcrypsetup can ensure this never happens: + * https://gitlab.com/cryptsetup/cryptsetup/-/merge_requests/96 */ + if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) + return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d); + if (!IN_SET(r, + 0, /* Success */ + -EEXIST, /* Volume is already open and ready to be used */ + -EBUSY, /* Volume is being opened but not ready, crypt_init_by_name can fetch details */ + -ENODEV /* Volume is being opened but not ready, crypt_init_by_name would fail, try to open again */)) + return r; + if (IN_SET(r, -EEXIST, -EBUSY)) { + struct crypt_device *existing_cd = NULL; + + if (!restore_deferred_remove){ + /* To avoid races, disable automatic removal on umount while setting up the new device. Restore it on failure. */ + r = dm_deferred_remove_cancel(name); + /* If activation returns EBUSY there might be no deferred removal to cancel, that's fine */ + if (r < 0 && r != -ENXIO) + return log_debug_errno(r, "Disabling automated deferred removal for verity device %s failed: %m", node); + if (r == 0) { + restore_deferred_remove = strdup(name); + if (!restore_deferred_remove) + return -ENOMEM; + } + } + + r = verity_can_reuse(verity, name, &existing_cd); + /* Same as above, -EINVAL can randomly happen when it actually means -EEXIST */ + if (r == -EINVAL && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) + return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d); + if (!IN_SET(r, 0, -ENODEV, -ENOENT, -EBUSY)) + return log_debug_errno(r, "Checking whether existing verity device %s can be reused failed: %m", node); + if (r == 0) { + /* devmapper might say that the device exists, but the devlink might not yet have been + * created. Check and wait for the udev event in that case. */ + r = device_wait_for_devlink(node, "block", usec_add(now(CLOCK_MONOTONIC), 100 * USEC_PER_MSEC), NULL); + /* Fallback to activation with a unique device if it's taking too long */ + if (r == -ETIMEDOUT) + break; + if (r < 0) + return r; + + if (cd) + sym_crypt_free(cd); + cd = existing_cd; + } + } + if (r == 0) + break; + + /* Device is being opened by another process, but it has not finished yet, yield for 2ms */ + (void) usleep(2 * USEC_PER_MSEC); + } + + /* An existing verity device was reported by libcryptsetup/libdevmapper, but we can't use it at this time. + * Fall back to activating it with a unique device name. */ + if (r != 0 && FLAGS_SET(flags, DISSECT_IMAGE_VERITY_SHARE)) + return verity_partition(designator, m, v, verity, flags & ~DISSECT_IMAGE_VERITY_SHARE, d); + + /* Everything looks good and we'll be able to mount the device, so deferred remove will be re-enabled at that point. */ + restore_deferred_remove = mfree(restore_deferred_remove); + + d->decrypted[d->n_decrypted++] = (DecryptedPartition) { + .name = TAKE_PTR(name), + .device = TAKE_PTR(cd), + }; + + m->decrypted_node = TAKE_PTR(node); + + return 0; +} +#endif + +int dissected_image_decrypt( + DissectedImage *m, + const char *passphrase, + const VeritySettings *verity, + DissectImageFlags flags, + DecryptedImage **ret) { + +#if HAVE_LIBCRYPTSETUP + _cleanup_(decrypted_image_unrefp) DecryptedImage *d = NULL; + int r; +#endif + + assert(m); + assert(!verity || verity->root_hash || verity->root_hash_size == 0); + + /* Returns: + * + * = 0 → There was nothing to decrypt + * > 0 → Decrypted successfully + * -ENOKEY → There's something to decrypt but no key was supplied + * -EKEYREJECTED → Passed key was not correct + */ + + if (verity && verity->root_hash && verity->root_hash_size < sizeof(sd_id128_t)) + return -EINVAL; + + if (!m->encrypted && !m->verity) { + *ret = NULL; + return 0; + } + +#if HAVE_LIBCRYPTSETUP + d = new0(DecryptedImage, 1); + if (!d) + return -ENOMEM; + + for (PartitionDesignator i = 0; i < _PARTITION_DESIGNATOR_MAX; i++) { + DissectedPartition *p = m->partitions + i; + PartitionDesignator k; + + if (!p->found) + continue; + + r = decrypt_partition(p, passphrase, flags, d); + if (r < 0) + return r; + + k = PARTITION_VERITY_OF(i); + if (k >= 0) { + r = verity_partition(i, p, m->partitions + k, verity, flags | DISSECT_IMAGE_VERITY_SHARE, d); + if (r < 0) + return r; + } + + if (!p->decrypted_fstype && p->decrypted_node) { + r = probe_filesystem(p->decrypted_node, &p->decrypted_fstype); + if (r < 0 && r != -EUCLEAN) + return r; + } + } + + *ret = TAKE_PTR(d); + + return 1; +#else + return -EOPNOTSUPP; +#endif +} + +int dissected_image_decrypt_interactively( + DissectedImage *m, + const char *passphrase, + const VeritySettings *verity, + DissectImageFlags flags, + DecryptedImage **ret) { + + _cleanup_strv_free_erase_ char **z = NULL; + int n = 3, r; + + if (passphrase) + n--; + + for (;;) { + r = dissected_image_decrypt(m, passphrase, verity, flags, ret); + if (r >= 0) + return r; + if (r == -EKEYREJECTED) + log_error_errno(r, "Incorrect passphrase, try again!"); + else if (r != -ENOKEY) + return log_error_errno(r, "Failed to decrypt image: %m"); + + if (--n < 0) + return log_error_errno(SYNTHETIC_ERRNO(EKEYREJECTED), + "Too many retries."); + + z = strv_free(z); + + r = ask_password_auto("Please enter image passphrase:", NULL, "dissect", "dissect", USEC_INFINITY, 0, &z); + if (r < 0) + return log_error_errno(r, "Failed to query for passphrase: %m"); + + passphrase = z[0]; + } +} + +int decrypted_image_relinquish(DecryptedImage *d) { + +#if HAVE_LIBCRYPTSETUP + size_t i; + int r; +#endif + + assert(d); + + /* Turns on automatic removal after the last use ended for all DM devices of this image, and sets a boolean so + * that we don't clean it up ourselves either anymore */ + +#if HAVE_LIBCRYPTSETUP + for (i = 0; i < d->n_decrypted; i++) { + DecryptedPartition *p = d->decrypted + i; + + if (p->relinquished) + continue; + + r = sym_crypt_deactivate_by_name(NULL, p->name, CRYPT_DEACTIVATE_DEFERRED); + if (r < 0) + return log_debug_errno(r, "Failed to mark %s for auto-removal: %m", p->name); + + p->relinquished = true; + } +#endif + + return 0; +} + +static char *build_auxiliary_path(const char *image, const char *suffix) { + const char *e; + char *n; + + assert(image); + assert(suffix); + + e = endswith(image, ".raw"); + if (!e) + return strjoin(e, suffix); + + n = new(char, e - image + strlen(suffix) + 1); + if (!n) + return NULL; + + strcpy(mempcpy(n, image, e - image), suffix); + return n; +} + +void verity_settings_done(VeritySettings *v) { + assert(v); + + v->root_hash = mfree(v->root_hash); + v->root_hash_size = 0; + + v->root_hash_sig = mfree(v->root_hash_sig); + v->root_hash_sig_size = 0; + + v->data_path = mfree(v->data_path); +} + +int verity_settings_load( + VeritySettings *verity, + const char *image, + const char *root_hash_path, + const char *root_hash_sig_path) { + + _cleanup_free_ void *root_hash = NULL, *root_hash_sig = NULL; + size_t root_hash_size = 0, root_hash_sig_size = 0; + _cleanup_free_ char *verity_data_path = NULL; + PartitionDesignator designator; + int r; + + assert(verity); + assert(image); + assert(verity->designator < 0 || IN_SET(verity->designator, PARTITION_ROOT, PARTITION_USR)); + + /* If we are asked to load the root hash for a device node, exit early */ + if (is_device_path(image)) + return 0; + + designator = verity->designator; + + /* We only fill in what isn't already filled in */ + + if (!verity->root_hash) { + _cleanup_free_ char *text = NULL; + + if (root_hash_path) { + /* If explicitly specified it takes precedence */ + r = read_one_line_file(root_hash_path, &text); + if (r < 0) + return r; + + if (designator < 0) + designator = PARTITION_ROOT; + } else { + /* Otherwise look for xattr and separate file, and first for the data for root and if + * that doesn't exist for /usr */ + + if (designator < 0 || designator == PARTITION_ROOT) { + r = getxattr_malloc(image, "user.verity.roothash", &text, true); + if (r < 0) { + _cleanup_free_ char *p = NULL; + + if (!IN_SET(r, -ENODATA, -ENOENT) && !ERRNO_IS_NOT_SUPPORTED(r)) + return r; + + p = build_auxiliary_path(image, ".roothash"); + if (!p) + return -ENOMEM; + + r = read_one_line_file(p, &text); + if (r < 0 && r != -ENOENT) + return r; + } + + if (text) + designator = PARTITION_ROOT; + } + + if (!text && (designator < 0 || designator == PARTITION_USR)) { + /* So in the "roothash" xattr/file name above the "root" of course primarily + * refers to the root of the Verity Merkle tree. But coincidentally it also + * is the hash for the *root* file system, i.e. the "root" neatly refers to + * two distinct concepts called "root". Taking benefit of this happy + * coincidence we call the file with the root hash for the /usr/ file system + * `usrhash`, because `usrroothash` or `rootusrhash` would just be too + * confusing. We thus drop the reference to the root of the Merkle tree, and + * just indicate which file system it's about. */ + r = getxattr_malloc(image, "user.verity.usrhash", &text, true); + if (r < 0) { + _cleanup_free_ char *p = NULL; + + if (!IN_SET(r, -ENODATA, -ENOENT) && !ERRNO_IS_NOT_SUPPORTED(r)) + return r; + + p = build_auxiliary_path(image, ".usrhash"); + if (!p) + return -ENOMEM; + + r = read_one_line_file(p, &text); + if (r < 0 && r != -ENOENT) + return r; + } + + if (text) + designator = PARTITION_USR; + } + } + + if (text) { + r = unhexmem(text, strlen(text), &root_hash, &root_hash_size); + if (r < 0) + return r; + if (root_hash_size < sizeof(sd_id128_t)) + return -EINVAL; + } + } + + if ((root_hash || verity->root_hash) && !verity->root_hash_sig) { + if (root_hash_sig_path) { + r = read_full_file_full(AT_FDCWD, root_hash_sig_path, 0, NULL, (char**) &root_hash_sig, &root_hash_sig_size); + if (r < 0 && r != -ENOENT) + return r; + + if (designator < 0) + designator = PARTITION_ROOT; + } else { + if (designator < 0 || designator == PARTITION_ROOT) { + _cleanup_free_ char *p = NULL; + + /* Follow naming convention recommended by the relevant RFC: + * https://tools.ietf.org/html/rfc5751#section-3.2.1 */ + p = build_auxiliary_path(image, ".roothash.p7s"); + if (!p) + return -ENOMEM; + + r = read_full_file_full(AT_FDCWD, p, 0, NULL, (char**) &root_hash_sig, &root_hash_sig_size); + if (r < 0 && r != -ENOENT) + return r; + if (r >= 0) + designator = PARTITION_ROOT; + } + + if (!root_hash_sig && (designator < 0 || designator == PARTITION_USR)) { + _cleanup_free_ char *p = NULL; + + p = build_auxiliary_path(image, ".usrhash.p7s"); + if (!p) + return -ENOMEM; + + r = read_full_file_full(AT_FDCWD, p, 0, NULL, (char**) &root_hash_sig, &root_hash_sig_size); + if (r < 0 && r != -ENOENT) + return r; + if (r >= 0) + designator = PARTITION_USR; + } + } + + if (root_hash_sig && root_hash_sig_size == 0) /* refuse empty size signatures */ + return -EINVAL; + } + + if (!verity->data_path) { + _cleanup_free_ char *p = NULL; + + p = build_auxiliary_path(image, ".verity"); + if (!p) + return -ENOMEM; + + if (access(p, F_OK) < 0) { + if (errno != ENOENT) + return -errno; + } else + verity_data_path = TAKE_PTR(p); + } + + if (root_hash) { + verity->root_hash = TAKE_PTR(root_hash); + verity->root_hash_size = root_hash_size; + } + + if (root_hash_sig) { + verity->root_hash_sig = TAKE_PTR(root_hash_sig); + verity->root_hash_sig_size = root_hash_sig_size; + } + + if (verity_data_path) + verity->data_path = TAKE_PTR(verity_data_path); + + if (verity->designator < 0) + verity->designator = designator; + + return 1; +} + +int dissected_image_acquire_metadata(DissectedImage *m) { + + enum { + META_HOSTNAME, + META_MACHINE_ID, + META_MACHINE_INFO, + META_OS_RELEASE, + _META_MAX, + }; + + static const char *const paths[_META_MAX] = { + [META_HOSTNAME] = "/etc/hostname\0", + [META_MACHINE_ID] = "/etc/machine-id\0", + [META_MACHINE_INFO] = "/etc/machine-info\0", + [META_OS_RELEASE] = "/etc/os-release\0" + "/usr/lib/os-release\0", + }; + + _cleanup_strv_free_ char **machine_info = NULL, **os_release = NULL; + _cleanup_close_pair_ int error_pipe[2] = { -1, -1 }; + _cleanup_(rmdir_and_freep) char *t = NULL; + _cleanup_(sigkill_waitp) pid_t child = 0; + sd_id128_t machine_id = SD_ID128_NULL; + _cleanup_free_ char *hostname = NULL; + unsigned n_meta_initialized = 0, k; + int fds[2 * _META_MAX], r, v; + ssize_t n; + + BLOCK_SIGNALS(SIGCHLD); + + assert(m); + + for (; n_meta_initialized < _META_MAX; n_meta_initialized ++) + if (pipe2(fds + 2*n_meta_initialized, O_CLOEXEC) < 0) { + r = -errno; + goto finish; + } + + r = mkdtemp_malloc("/tmp/dissect-XXXXXX", &t); + if (r < 0) + goto finish; + + if (pipe2(error_pipe, O_CLOEXEC) < 0) { + r = -errno; + goto finish; + } + + r = safe_fork("(sd-dissect)", FORK_RESET_SIGNALS|FORK_DEATHSIG|FORK_NEW_MOUNTNS|FORK_MOUNTNS_SLAVE, &child); + if (r < 0) + goto finish; + if (r == 0) { + error_pipe[0] = safe_close(error_pipe[0]); + + r = dissected_image_mount(m, t, UID_INVALID, DISSECT_IMAGE_READ_ONLY|DISSECT_IMAGE_MOUNT_ROOT_ONLY|DISSECT_IMAGE_VALIDATE_OS); + if (r < 0) { + /* Let parent know the error */ + (void) write(error_pipe[1], &r, sizeof(r)); + + log_debug_errno(r, "Failed to mount dissected image: %m"); + _exit(EXIT_FAILURE); + } + + for (k = 0; k < _META_MAX; k++) { + _cleanup_close_ int fd = -ENOENT; + const char *p; + + fds[2*k] = safe_close(fds[2*k]); + + NULSTR_FOREACH(p, paths[k]) { + fd = chase_symlinks_and_open(p, t, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_NOCTTY, NULL); + if (fd >= 0) + break; + } + if (fd < 0) { + log_debug_errno(fd, "Failed to read %s file of image, ignoring: %m", paths[k]); + fds[2*k+1] = safe_close(fds[2*k+1]); + continue; + } + + r = copy_bytes(fd, fds[2*k+1], (uint64_t) -1, 0); + if (r < 0) { + (void) write(error_pipe[1], &r, sizeof(r)); + _exit(EXIT_FAILURE); + } + + fds[2*k+1] = safe_close(fds[2*k+1]); + } + + _exit(EXIT_SUCCESS); + } + + error_pipe[1] = safe_close(error_pipe[1]); + + for (k = 0; k < _META_MAX; k++) { + _cleanup_fclose_ FILE *f = NULL; + + fds[2*k+1] = safe_close(fds[2*k+1]); + + f = take_fdopen(&fds[2*k], "r"); + if (!f) { + r = -errno; + goto finish; + } + + switch (k) { + + case META_HOSTNAME: + r = read_etc_hostname_stream(f, &hostname); + if (r < 0) + log_debug_errno(r, "Failed to read /etc/hostname: %m"); + + break; + + case META_MACHINE_ID: { + _cleanup_free_ char *line = NULL; + + r = read_line(f, LONG_LINE_MAX, &line); + if (r < 0) + log_debug_errno(r, "Failed to read /etc/machine-id: %m"); + else if (r == 33) { + r = sd_id128_from_string(line, &machine_id); + if (r < 0) + log_debug_errno(r, "Image contains invalid /etc/machine-id: %s", line); + } else if (r == 0) + log_debug("/etc/machine-id file is empty."); + else if (streq(line, "uninitialized")) + log_debug("/etc/machine-id file is uninitialized (likely aborted first boot)."); + else + log_debug("/etc/machine-id has unexpected length %i.", r); + + break; + } + + case META_MACHINE_INFO: + r = load_env_file_pairs(f, "machine-info", &machine_info); + if (r < 0) + log_debug_errno(r, "Failed to read /etc/machine-info: %m"); + + break; + + case META_OS_RELEASE: + r = load_env_file_pairs(f, "os-release", &os_release); + if (r < 0) + log_debug_errno(r, "Failed to read OS release file: %m"); + + break; + } + } + + r = wait_for_terminate_and_check("(sd-dissect)", child, 0); + child = 0; + if (r < 0) + return r; + + n = read(error_pipe[0], &v, sizeof(v)); + if (n < 0) + return -errno; + if (n == sizeof(v)) + return v; /* propagate error sent to us from child */ + if (n != 0) + return -EIO; + + if (r != EXIT_SUCCESS) + return -EPROTO; + + free_and_replace(m->hostname, hostname); + m->machine_id = machine_id; + strv_free_and_replace(m->machine_info, machine_info); + strv_free_and_replace(m->os_release, os_release); + +finish: + for (k = 0; k < n_meta_initialized; k++) + safe_close_pair(fds + 2*k); + + return r; +} + +int dissect_image_and_warn( + int fd, + const char *name, + const VeritySettings *verity, + const MountOptions *mount_options, + DissectImageFlags flags, + DissectedImage **ret) { + + _cleanup_free_ char *buffer = NULL; + int r; + + if (!name) { + r = fd_get_path(fd, &buffer); + if (r < 0) + return r; + + name = buffer; + } + + r = dissect_image(fd, verity, mount_options, flags, ret); + switch (r) { + + case -EOPNOTSUPP: + return log_error_errno(r, "Dissecting images is not supported, compiled without blkid support."); + + case -ENOPKG: + return log_error_errno(r, "Couldn't identify a suitable partition table or file system in '%s'.", name); + + case -EADDRNOTAVAIL: + return log_error_errno(r, "No root partition for specified root hash found in '%s'.", name); + + case -ENOTUNIQ: + return log_error_errno(r, "Multiple suitable root partitions found in image '%s'.", name); + + case -ENXIO: + return log_error_errno(r, "No suitable root partition found in image '%s'.", name); + + case -EPROTONOSUPPORT: + return log_error_errno(r, "Device '%s' is loopback block device with partition scanning turned off, please turn it on.", name); + + default: + if (r < 0) + return log_error_errno(r, "Failed to dissect image '%s': %m", name); + + return r; + } +} + +bool dissected_image_can_do_verity(const DissectedImage *image, PartitionDesignator partition_designator) { + if (image->single_file_system) + return partition_designator == PARTITION_ROOT && image->can_verity; + + return PARTITION_VERITY_OF(partition_designator) >= 0; +} + +bool dissected_image_has_verity(const DissectedImage *image, PartitionDesignator partition_designator) { + int k; + + if (image->single_file_system) + return partition_designator == PARTITION_ROOT && image->verity; + + k = PARTITION_VERITY_OF(partition_designator); + return k >= 0 && image->partitions[k].found; +} + +MountOptions* mount_options_free_all(MountOptions *options) { + MountOptions *m; + + while ((m = options)) { + LIST_REMOVE(mount_options, options, m); + free(m->options); + free(m); + } + + return NULL; +} + +const char* mount_options_from_designator(const MountOptions *options, PartitionDesignator designator) { + const MountOptions *m; + + LIST_FOREACH(mount_options, m, options) + if (designator == m->partition_designator && !isempty(m->options)) + return m->options; + + return NULL; +} + +int mount_image_privately_interactively( + const char *image, + DissectImageFlags flags, + char **ret_directory, + LoopDevice **ret_loop_device, + DecryptedImage **ret_decrypted_image) { + + _cleanup_(loop_device_unrefp) LoopDevice *d = NULL; + _cleanup_(decrypted_image_unrefp) DecryptedImage *decrypted_image = NULL; + _cleanup_(dissected_image_unrefp) DissectedImage *dissected_image = NULL; + _cleanup_(rmdir_and_freep) char *created_dir = NULL; + _cleanup_free_ char *temp = NULL; + int r; + + /* Mounts an OS image at a temporary place, inside a newly created mount namespace of our own. This + * is used by tools such as systemd-tmpfiles or systemd-firstboot to operate on some disk image + * easily. */ + + assert(image); + assert(ret_directory); + assert(ret_loop_device); + assert(ret_decrypted_image); + + r = tempfn_random_child(NULL, program_invocation_short_name, &temp); + if (r < 0) + return log_error_errno(r, "Failed to generate temporary mount directory: %m"); + + r = loop_device_make_by_path( + image, + FLAGS_SET(flags, DISSECT_IMAGE_READ_ONLY) ? O_RDONLY : O_RDWR, + FLAGS_SET(flags, DISSECT_IMAGE_NO_PARTITION_TABLE) ? 0 : LO_FLAGS_PARTSCAN, + &d); + if (r < 0) + return log_error_errno(r, "Failed to set up loopback device: %m"); + + r = dissect_image_and_warn(d->fd, image, NULL, NULL, flags, &dissected_image); + if (r < 0) + return r; + + r = dissected_image_decrypt_interactively(dissected_image, NULL, NULL, flags, &decrypted_image); + if (r < 0) + return r; + + r = detach_mount_namespace(); + if (r < 0) + return log_error_errno(r, "Failed to detach mount namespace: %m"); + + r = mkdir_p(temp, 0700); + if (r < 0) + return log_error_errno(r, "Failed to create mount point: %m"); + + created_dir = TAKE_PTR(temp); + + r = dissected_image_mount_and_warn(dissected_image, created_dir, UID_INVALID, flags); + if (r < 0) + return r; + + if (decrypted_image) { + r = decrypted_image_relinquish(decrypted_image); + if (r < 0) + return log_error_errno(r, "Failed to relinquish DM devices: %m"); + } + + loop_device_relinquish(d); + + *ret_directory = TAKE_PTR(created_dir); + *ret_loop_device = TAKE_PTR(d); + *ret_decrypted_image = TAKE_PTR(decrypted_image); + + return 0; +} + +static const char *const partition_designator_table[] = { + [PARTITION_ROOT] = "root", + [PARTITION_ROOT_SECONDARY] = "root-secondary", + [PARTITION_USR] = "usr", + [PARTITION_USR_SECONDARY] = "usr-secondary", + [PARTITION_HOME] = "home", + [PARTITION_SRV] = "srv", + [PARTITION_ESP] = "esp", + [PARTITION_XBOOTLDR] = "xbootldr", + [PARTITION_SWAP] = "swap", + [PARTITION_ROOT_VERITY] = "root-verity", + [PARTITION_ROOT_SECONDARY_VERITY] = "root-secondary-verity", + [PARTITION_USR_VERITY] = "usr-verity", + [PARTITION_USR_SECONDARY_VERITY] = "usr-secondary-verity", + [PARTITION_TMP] = "tmp", + [PARTITION_VAR] = "var", +}; + +DEFINE_STRING_TABLE_LOOKUP(partition_designator, PartitionDesignator); |