summaryrefslogtreecommitdiffstats
path: root/src/shared/dissect-image.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/shared/dissect-image.c')
-rw-r--r--src/shared/dissect-image.c2557
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);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-26 04:46:14 +0000