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-rw-r--r--src/shared/bootspec.c665
1 files changed, 665 insertions, 0 deletions
diff --git a/src/shared/bootspec.c b/src/shared/bootspec.c
new file mode 100644
index 0000000..7e276f1
--- /dev/null
+++ b/src/shared/bootspec.c
@@ -0,0 +1,665 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <stdio.h>
+#include <linux/magic.h>
+
+#include "sd-id128.h"
+
+#include "alloc-util.h"
+#include "blkid-util.h"
+#include "bootspec.h"
+#include "conf-files.h"
+#include "def.h"
+#include "device-nodes.h"
+#include "efivars.h"
+#include "env-util.h"
+#include "fd-util.h"
+#include "fileio.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+#include "strv.h"
+#include "virt.h"
+
+static void boot_entry_free(BootEntry *entry) {
+ assert(entry);
+
+ free(entry->id);
+ free(entry->path);
+ free(entry->title);
+ free(entry->show_title);
+ free(entry->version);
+ free(entry->machine_id);
+ free(entry->architecture);
+ strv_free(entry->options);
+ free(entry->kernel);
+ free(entry->efi);
+ strv_free(entry->initrd);
+ free(entry->device_tree);
+}
+
+static int boot_entry_load(const char *path, BootEntry *entry) {
+ _cleanup_(boot_entry_free) BootEntry tmp = {};
+ _cleanup_fclose_ FILE *f = NULL;
+ unsigned line = 1;
+ char *b, *c;
+ int r;
+
+ assert(path);
+ assert(entry);
+
+ c = endswith_no_case(path, ".conf");
+ if (!c) {
+ log_error("Invalid loader entry filename: %s", path);
+ return -EINVAL;
+ }
+
+ b = basename(path);
+ tmp.id = strndup(b, c - b);
+ if (!tmp.id)
+ return log_oom();
+
+ tmp.path = strdup(path);
+ if (!tmp.path)
+ return log_oom();
+
+ f = fopen(path, "re");
+ if (!f)
+ return log_error_errno(errno, "Failed to open \"%s\": %m", path);
+
+ for (;;) {
+ _cleanup_free_ char *buf = NULL, *field = NULL;
+ const char *p;
+
+ r = read_line(f, LONG_LINE_MAX, &buf);
+ if (r == 0)
+ break;
+ if (r == -ENOBUFS)
+ return log_error_errno(r, "%s:%u: Line too long", path, line);
+ if (r < 0)
+ return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
+
+ line++;
+
+ if (IN_SET(*strstrip(buf), '#', '\0'))
+ continue;
+
+ p = buf;
+ r = extract_first_word(&p, &field, " \t", 0);
+ if (r < 0) {
+ log_error_errno(r, "Failed to parse config file %s line %u: %m", path, line);
+ continue;
+ }
+ if (r == 0) {
+ log_warning("%s:%u: Bad syntax", path, line);
+ continue;
+ }
+
+ if (streq(field, "title"))
+ r = free_and_strdup(&tmp.title, p);
+ else if (streq(field, "version"))
+ r = free_and_strdup(&tmp.version, p);
+ else if (streq(field, "machine-id"))
+ r = free_and_strdup(&tmp.machine_id, p);
+ else if (streq(field, "architecture"))
+ r = free_and_strdup(&tmp.architecture, p);
+ else if (streq(field, "options"))
+ r = strv_extend(&tmp.options, p);
+ else if (streq(field, "linux"))
+ r = free_and_strdup(&tmp.kernel, p);
+ else if (streq(field, "efi"))
+ r = free_and_strdup(&tmp.efi, p);
+ else if (streq(field, "initrd"))
+ r = strv_extend(&tmp.initrd, p);
+ else if (streq(field, "devicetree"))
+ r = free_and_strdup(&tmp.device_tree, p);
+ else {
+ log_notice("%s:%u: Unknown line \"%s\"", path, line, field);
+ continue;
+ }
+ if (r < 0)
+ return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
+ }
+
+ *entry = tmp;
+ tmp = (BootEntry) {};
+ return 0;
+}
+
+void boot_config_free(BootConfig *config) {
+ size_t i;
+
+ assert(config);
+
+ free(config->default_pattern);
+ free(config->timeout);
+ free(config->editor);
+ free(config->auto_entries);
+ free(config->auto_firmware);
+
+ free(config->entry_oneshot);
+ free(config->entry_default);
+
+ for (i = 0; i < config->n_entries; i++)
+ boot_entry_free(config->entries + i);
+ free(config->entries);
+}
+
+static int boot_loader_read_conf(const char *path, BootConfig *config) {
+ _cleanup_fclose_ FILE *f = NULL;
+ unsigned line = 1;
+ int r;
+
+ assert(path);
+ assert(config);
+
+ f = fopen(path, "re");
+ if (!f) {
+ if (errno == ENOENT)
+ return 0;
+
+ return log_error_errno(errno, "Failed to open \"%s\": %m", path);
+ }
+
+ for (;;) {
+ _cleanup_free_ char *buf = NULL, *field = NULL;
+ const char *p;
+
+ r = read_line(f, LONG_LINE_MAX, &buf);
+ if (r == 0)
+ break;
+ if (r == -ENOBUFS)
+ return log_error_errno(r, "%s:%u: Line too long", path, line);
+ if (r < 0)
+ return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
+
+ line++;
+
+ if (IN_SET(*strstrip(buf), '#', '\0'))
+ continue;
+
+ p = buf;
+ r = extract_first_word(&p, &field, " \t", 0);
+ if (r < 0) {
+ log_error_errno(r, "Failed to parse config file %s line %u: %m", path, line);
+ continue;
+ }
+ if (r == 0) {
+ log_warning("%s:%u: Bad syntax", path, line);
+ continue;
+ }
+
+ if (streq(field, "default"))
+ r = free_and_strdup(&config->default_pattern, p);
+ else if (streq(field, "timeout"))
+ r = free_and_strdup(&config->timeout, p);
+ else if (streq(field, "editor"))
+ r = free_and_strdup(&config->editor, p);
+ else if (streq(field, "auto-entries"))
+ r = free_and_strdup(&config->auto_entries, p);
+ else if (streq(field, "auto-firmware"))
+ r = free_and_strdup(&config->auto_firmware, p);
+ else if (streq(field, "console-mode"))
+ r = free_and_strdup(&config->console_mode, p);
+ else {
+ log_notice("%s:%u: Unknown line \"%s\"", path, line, field);
+ continue;
+ }
+ if (r < 0)
+ return log_error_errno(r, "%s:%u: Error while reading: %m", path, line);
+ }
+
+ return 1;
+}
+
+static int boot_entry_compare(const BootEntry *a, const BootEntry *b) {
+ return str_verscmp(a->id, b->id);
+}
+
+static int boot_entries_find(const char *dir, BootEntry **ret_entries, size_t *ret_n_entries) {
+ _cleanup_strv_free_ char **files = NULL;
+ char **f;
+ int r;
+ BootEntry *array = NULL;
+ size_t n_allocated = 0, n = 0;
+
+ assert(dir);
+ assert(ret_entries);
+ assert(ret_n_entries);
+
+ r = conf_files_list(&files, ".conf", NULL, 0, dir, NULL);
+ if (r < 0)
+ return log_error_errno(r, "Failed to list files in \"%s\": %m", dir);
+
+ STRV_FOREACH(f, files) {
+ if (!GREEDY_REALLOC0(array, n_allocated, n + 1))
+ return log_oom();
+
+ r = boot_entry_load(*f, array + n);
+ if (r < 0)
+ continue;
+
+ n++;
+ }
+
+ typesafe_qsort(array, n, boot_entry_compare);
+
+ *ret_entries = array;
+ *ret_n_entries = n;
+
+ return 0;
+}
+
+static bool find_nonunique(BootEntry *entries, size_t n_entries, bool *arr) {
+ size_t i, j;
+ bool non_unique = false;
+
+ assert(entries || n_entries == 0);
+ assert(arr || n_entries == 0);
+
+ for (i = 0; i < n_entries; i++)
+ arr[i] = false;
+
+ for (i = 0; i < n_entries; i++)
+ for (j = 0; j < n_entries; j++)
+ if (i != j && streq(boot_entry_title(entries + i),
+ boot_entry_title(entries + j)))
+ non_unique = arr[i] = arr[j] = true;
+
+ return non_unique;
+}
+
+static int boot_entries_uniquify(BootEntry *entries, size_t n_entries) {
+ char *s;
+ size_t i;
+ int r;
+ bool arr[n_entries];
+
+ assert(entries || n_entries == 0);
+
+ /* Find _all_ non-unique titles */
+ if (!find_nonunique(entries, n_entries, arr))
+ return 0;
+
+ /* Add version to non-unique titles */
+ for (i = 0; i < n_entries; i++)
+ if (arr[i] && entries[i].version) {
+ r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].version);
+ if (r < 0)
+ return -ENOMEM;
+
+ free_and_replace(entries[i].show_title, s);
+ }
+
+ if (!find_nonunique(entries, n_entries, arr))
+ return 0;
+
+ /* Add machine-id to non-unique titles */
+ for (i = 0; i < n_entries; i++)
+ if (arr[i] && entries[i].machine_id) {
+ r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].machine_id);
+ if (r < 0)
+ return -ENOMEM;
+
+ free_and_replace(entries[i].show_title, s);
+ }
+
+ if (!find_nonunique(entries, n_entries, arr))
+ return 0;
+
+ /* Add file name to non-unique titles */
+ for (i = 0; i < n_entries; i++)
+ if (arr[i]) {
+ r = asprintf(&s, "%s (%s)", boot_entry_title(entries + i), entries[i].id);
+ if (r < 0)
+ return -ENOMEM;
+
+ free_and_replace(entries[i].show_title, s);
+ }
+
+ return 0;
+}
+
+static int boot_entries_select_default(const BootConfig *config) {
+ int i;
+
+ assert(config);
+
+ if (config->entry_oneshot)
+ for (i = config->n_entries - 1; i >= 0; i--)
+ if (streq(config->entry_oneshot, config->entries[i].id)) {
+ log_debug("Found default: id \"%s\" is matched by LoaderEntryOneShot",
+ config->entries[i].id);
+ return i;
+ }
+
+ if (config->entry_default)
+ for (i = config->n_entries - 1; i >= 0; i--)
+ if (streq(config->entry_default, config->entries[i].id)) {
+ log_debug("Found default: id \"%s\" is matched by LoaderEntryDefault",
+ config->entries[i].id);
+ return i;
+ }
+
+ if (config->default_pattern)
+ for (i = config->n_entries - 1; i >= 0; i--)
+ if (fnmatch(config->default_pattern, config->entries[i].id, FNM_CASEFOLD) == 0) {
+ log_debug("Found default: id \"%s\" is matched by pattern \"%s\"",
+ config->entries[i].id, config->default_pattern);
+ return i;
+ }
+
+ if (config->n_entries > 0)
+ log_debug("Found default: last entry \"%s\"", config->entries[config->n_entries - 1].id);
+ else
+ log_debug("Found no default boot entry :(");
+
+ return config->n_entries - 1; /* -1 means "no default" */
+}
+
+int boot_entries_load_config(const char *esp_path, BootConfig *config) {
+ const char *p;
+ int r;
+
+ assert(esp_path);
+ assert(config);
+
+ p = strjoina(esp_path, "/loader/loader.conf");
+ r = boot_loader_read_conf(p, config);
+ if (r < 0)
+ return r;
+
+ p = strjoina(esp_path, "/loader/entries");
+ r = boot_entries_find(p, &config->entries, &config->n_entries);
+ if (r < 0)
+ return r;
+
+ r = boot_entries_uniquify(config->entries, config->n_entries);
+ if (r < 0)
+ return log_error_errno(r, "Failed to uniquify boot entries: %m");
+
+ if (is_efi_boot()) {
+ r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryOneShot", &config->entry_oneshot);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "Failed to read EFI var \"LoaderEntryOneShot\": %m");
+
+ r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderEntryDefault", &config->entry_default);
+ if (r < 0 && r != -ENOENT)
+ return log_error_errno(r, "Failed to read EFI var \"LoaderEntryDefault\": %m");
+ }
+
+ config->default_entry = boot_entries_select_default(config);
+ return 0;
+}
+
+/********************************************************************************/
+
+static int verify_esp(
+ const char *p,
+ bool searching,
+ bool unprivileged_mode,
+ uint32_t *ret_part,
+ uint64_t *ret_pstart,
+ uint64_t *ret_psize,
+ sd_id128_t *ret_uuid) {
+#if HAVE_BLKID
+ _cleanup_(blkid_free_probep) blkid_probe b = NULL;
+ _cleanup_free_ char *node = NULL;
+ const char *v;
+#endif
+ uint64_t pstart = 0, psize = 0;
+ struct stat st, st2;
+ const char *t2;
+ struct statfs sfs;
+ sd_id128_t uuid = SD_ID128_NULL;
+ uint32_t part = 0;
+ bool relax_checks;
+ int r;
+
+ assert(p);
+
+ relax_checks = getenv_bool("SYSTEMD_RELAX_ESP_CHECKS") > 0;
+
+ /* Non-root user can only check the status, so if an error occured in the following, it does not cause any
+ * issues. Let's also, silence the error messages. */
+
+ if (!relax_checks) {
+ if (statfs(p, &sfs) < 0) {
+ /* If we are searching for the mount point, don't generate a log message if we can't find the path */
+ if (errno == ENOENT && searching)
+ return -ENOENT;
+
+ return log_full_errno(unprivileged_mode && errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
+ "Failed to check file system type of \"%s\": %m", p);
+ }
+
+ if (!F_TYPE_EQUAL(sfs.f_type, MSDOS_SUPER_MAGIC)) {
+ if (searching)
+ return -EADDRNOTAVAIL;
+
+ log_error("File system \"%s\" is not a FAT EFI System Partition (ESP) file system.", p);
+ return -ENODEV;
+ }
+ }
+
+ if (stat(p, &st) < 0)
+ return log_full_errno(unprivileged_mode && errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
+ "Failed to determine block device node of \"%s\": %m", p);
+
+ if (major(st.st_dev) == 0) {
+ log_error("Block device node of %p is invalid.", p);
+ return -ENODEV;
+ }
+
+ t2 = strjoina(p, "/..");
+ r = stat(t2, &st2);
+ if (r < 0)
+ return log_full_errno(unprivileged_mode && errno == EACCES ? LOG_DEBUG : LOG_ERR, errno,
+ "Failed to determine block device node of parent of \"%s\": %m", p);
+
+ if (st.st_dev == st2.st_dev) {
+ log_error("Directory \"%s\" is not the root of the EFI System Partition (ESP) file system.", p);
+ return -ENODEV;
+ }
+
+ /* In a container we don't have access to block devices, skip this part of the verification, we trust the
+ * container manager set everything up correctly on its own. Also skip the following verification for non-root user. */
+ if (detect_container() > 0 || unprivileged_mode || relax_checks)
+ goto finish;
+
+#if HAVE_BLKID
+ r = device_path_make_major_minor(S_IFBLK, st.st_dev, &node);
+ if (r < 0)
+ return log_error_errno(r, "Failed to format major/minor device path: %m");
+ errno = 0;
+ b = blkid_new_probe_from_filename(node);
+ if (!b)
+ return log_error_errno(errno ?: ENOMEM, "Failed to open file system \"%s\": %m", p);
+
+ blkid_probe_enable_superblocks(b, 1);
+ blkid_probe_set_superblocks_flags(b, BLKID_SUBLKS_TYPE);
+ blkid_probe_enable_partitions(b, 1);
+ blkid_probe_set_partitions_flags(b, BLKID_PARTS_ENTRY_DETAILS);
+
+ errno = 0;
+ r = blkid_do_safeprobe(b);
+ if (r == -2) {
+ log_error("File system \"%s\" is ambiguous.", p);
+ return -ENODEV;
+ } else if (r == 1) {
+ log_error("File system \"%s\" does not contain a label.", p);
+ return -ENODEV;
+ } else if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe file system \"%s\": %m", p);
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "TYPE", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe file system type \"%s\": %m", p);
+ if (!streq(v, "vfat")) {
+ log_error("File system \"%s\" is not FAT.", p);
+ return -ENODEV;
+ }
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe partition scheme \"%s\": %m", p);
+ if (!streq(v, "gpt")) {
+ log_error("File system \"%s\" is not on a GPT partition table.", p);
+ return -ENODEV;
+ }
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_TYPE", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe partition type UUID \"%s\": %m", p);
+ if (!streq(v, "c12a7328-f81f-11d2-ba4b-00a0c93ec93b")) {
+ log_error("File system \"%s\" has wrong type for an EFI System Partition (ESP).", p);
+ return -ENODEV;
+ }
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_UUID", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe partition entry UUID \"%s\": %m", p);
+ r = sd_id128_from_string(v, &uuid);
+ if (r < 0) {
+ log_error("Partition \"%s\" has invalid UUID \"%s\".", p, v);
+ return -EIO;
+ }
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_NUMBER", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe partition number \"%s\": m", p);
+ r = safe_atou32(v, &part);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse PART_ENTRY_NUMBER field.");
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_OFFSET", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe partition offset \"%s\": %m", p);
+ r = safe_atou64(v, &pstart);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse PART_ENTRY_OFFSET field.");
+
+ errno = 0;
+ r = blkid_probe_lookup_value(b, "PART_ENTRY_SIZE", &v, NULL);
+ if (r != 0)
+ return log_error_errno(errno ?: EIO, "Failed to probe partition size \"%s\": %m", p);
+ r = safe_atou64(v, &psize);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse PART_ENTRY_SIZE field.");
+#endif
+
+finish:
+ if (ret_part)
+ *ret_part = part;
+ if (ret_pstart)
+ *ret_pstart = pstart;
+ if (ret_psize)
+ *ret_psize = psize;
+ if (ret_uuid)
+ *ret_uuid = uuid;
+
+ return 0;
+}
+
+int find_esp_and_warn(
+ const char *path,
+ bool unprivileged_mode,
+ char **ret_path,
+ uint32_t *ret_part,
+ uint64_t *ret_pstart,
+ uint64_t *ret_psize,
+ sd_id128_t *ret_uuid) {
+
+ int r;
+
+ /* This logs about all errors except:
+ *
+ * -ENOKEY → when we can't find the partition
+ * -EACCESS → when unprivileged_mode is true, and we can't access something
+ */
+
+ if (path) {
+ r = verify_esp(path, false, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);
+ if (r < 0)
+ return r;
+
+ goto found;
+ }
+
+ path = getenv("SYSTEMD_ESP_PATH");
+ if (path) {
+ if (!path_is_valid(path) || !path_is_absolute(path))
+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL),
+ "$SYSTEMD_ESP_PATH does not refer to absolute path, refusing to use it: %s",
+ path);
+
+ /* Note: when the user explicitly configured things with an env var we won't validate the mount
+ * point. After all we want this to be useful for testing. */
+ goto found;
+ }
+
+ FOREACH_STRING(path, "/efi", "/boot", "/boot/efi") {
+
+ r = verify_esp(path, true, unprivileged_mode, ret_part, ret_pstart, ret_psize, ret_uuid);
+ if (r >= 0)
+ goto found;
+ if (!IN_SET(r, -ENOENT, -EADDRNOTAVAIL)) /* This one is not it */
+ return r;
+ }
+
+ /* No logging here */
+ return -ENOKEY;
+
+found:
+ if (ret_path) {
+ char *c;
+
+ c = strdup(path);
+ if (!c)
+ return log_oom();
+
+ *ret_path = c;
+ }
+
+ return 0;
+}
+
+int find_default_boot_entry(
+ const char *esp_path,
+ char **esp_where,
+ BootConfig *config,
+ const BootEntry **e) {
+
+ _cleanup_free_ char *where = NULL;
+ int r;
+
+ assert(config);
+ assert(e);
+
+ r = find_esp_and_warn(esp_path, false, &where, NULL, NULL, NULL, NULL);
+ if (r < 0)
+ return r;
+
+ r = boot_entries_load_config(where, config);
+ if (r < 0)
+ return log_error_errno(r, "Failed to load bootspec config from \"%s/loader\": %m", where);
+
+ if (config->default_entry < 0)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOENT),
+ "No entry suitable as default, refusing to guess.");
+
+ *e = &config->entries[config->default_entry];
+ log_debug("Found default boot entry in file \"%s\"", (*e)->path);
+
+ if (esp_where)
+ *esp_where = TAKE_PTR(where);
+
+ return 0;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-08-13 10:15:30 +0000