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-rw-r--r--src/boot/bless-boot.c476
1 files changed, 476 insertions, 0 deletions
diff --git a/src/boot/bless-boot.c b/src/boot/bless-boot.c
new file mode 100644
index 0000000000..84ac9e39e4
--- /dev/null
+++ b/src/boot/bless-boot.c
@@ -0,0 +1,476 @@
+/* SPDX-License-Identifier: LGPL-2.1+ */
+
+#include <getopt.h>
+#include <stdlib.h>
+
+#include "alloc-util.h"
+#include "bootspec.h"
+#include "efivars.h"
+#include "fd-util.h"
+#include "fs-util.h"
+#include "log.h"
+#include "parse-util.h"
+#include "path-util.h"
+#include "util.h"
+#include "verbs.h"
+#include "virt.h"
+
+static char *arg_path = NULL;
+
+static int help(int argc, char *argv[], void *userdata) {
+
+ printf("%s [COMMAND] [OPTIONS...]\n"
+ "\n"
+ "Mark the boot process as good or bad.\n\n"
+ " -h --help Show this help\n"
+ " --version Print version\n"
+ " --path=PATH Path to the EFI System Partition (ESP)\n"
+ "\n"
+ "Commands:\n"
+ " good Mark this boot as good\n"
+ " bad Mark this boot as bad\n"
+ " indeterminate Undo any marking as good or bad\n",
+ program_invocation_short_name);
+
+ return 0;
+}
+
+static int parse_argv(int argc, char *argv[]) {
+ enum {
+ ARG_PATH = 0x100,
+ ARG_VERSION,
+ };
+
+ static const struct option options[] = {
+ { "help", no_argument, NULL, 'h' },
+ { "version", no_argument, NULL, ARG_VERSION },
+ { "path", required_argument, NULL, ARG_PATH },
+ {}
+ };
+
+ int c, r;
+
+ assert(argc >= 0);
+ assert(argv);
+
+ while ((c = getopt_long(argc, argv, "h", options, NULL)) >= 0)
+ switch (c) {
+
+ case 'h':
+ help(0, NULL, NULL);
+ return 0;
+
+ case ARG_VERSION:
+ return version();
+
+ case ARG_PATH:
+ r = free_and_strdup(&arg_path, optarg);
+ if (r < 0)
+ return log_oom();
+ break;
+
+ case '?':
+ return -EINVAL;
+
+ default:
+ assert_not_reached("Unknown option");
+ }
+
+ return 1;
+}
+
+static int acquire_esp(void) {
+ _cleanup_free_ char *np = NULL;
+ int r;
+
+ r = find_esp_and_warn(arg_path, false, &np, NULL, NULL, NULL, NULL);
+ if (r == -ENOKEY) /* find_esp_and_warn() doesn't warn in this one error case, but in all others */
+ return log_error_errno(r,
+ "Couldn't find EFI system partition. It is recommended to mount it to /boot or /efi.\n"
+ "Alternatively, use --path= to specify path to mount point.");
+ if (r < 0)
+ return r;
+
+ free_and_replace(arg_path, np);
+ log_debug("Using EFI System Partition at %s.", arg_path);
+
+ return 0;
+}
+
+static int parse_counter(
+ const char *path,
+ const char **p,
+ uint64_t *ret_left,
+ uint64_t *ret_done) {
+
+ uint64_t left, done;
+ const char *z, *e;
+ size_t k;
+ int r;
+
+ assert(path);
+ assert(p);
+
+ e = *p;
+ assert(e);
+ assert(*e == '+');
+
+ e++;
+
+ k = strspn(e, DIGITS);
+ if (k == 0) {
+ log_error("Can't parse empty 'tries left' counter from LoaderBootCountPath: %s", path);
+ return -EINVAL;
+ }
+
+ z = strndupa(e, k);
+ r = safe_atou64(z, &left);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse 'tries left' counter from LoaderBootCountPath: %s", path);
+
+ e += k;
+
+ if (*e == '-') {
+ e++;
+
+ k = strspn(e, DIGITS);
+ if (k == 0) { /* If there's a "-" there also needs to be at least one digit */
+ log_error("Can't parse empty 'tries done' counter from LoaderBootCountPath: %s", path);
+ return -EINVAL;
+ }
+
+ z = strndupa(e, k);
+ r = safe_atou64(z, &done);
+ if (r < 0)
+ return log_error_errno(r, "Failed to parse 'tries done' counter from LoaderBootCountPath: %s", path);
+
+ e += k;
+ } else
+ done = 0;
+
+ if (done == 0)
+ log_warning("The 'tries done' counter is currently at zero. This can't really be, after all we are running, and this boot must hence count as one. Proceeding anyway.");
+
+ *p = e;
+
+ if (ret_left)
+ *ret_left = left;
+
+ if (ret_done)
+ *ret_done = done;
+
+ return 0;
+}
+
+static int acquire_boot_count_path(
+ char **ret_path,
+ char **ret_prefix,
+ uint64_t *ret_left,
+ uint64_t *ret_done,
+ char **ret_suffix) {
+
+ _cleanup_free_ char *path = NULL, *prefix = NULL, *suffix = NULL;
+ const char *last, *e;
+ uint64_t left, done;
+ int r;
+
+ r = efi_get_variable_string(EFI_VENDOR_LOADER, "LoaderBootCountPath", &path);
+ if (r == -ENOENT)
+ return -EUNATCH; /* in this case, let the caller print a message */
+ if (r < 0)
+ return log_error_errno(r, "Failed to read LoaderBootCountPath EFI variable: %m");
+
+ efi_tilt_backslashes(path);
+
+ if (!path_is_normalized(path)) {
+ log_error("Path read from LoaderBootCountPath is not normalized, refusing: %s", path);
+ return -EINVAL;
+ }
+
+ if (!path_is_absolute(path)) {
+ log_error("Path read from LoaderBootCountPath is not absolute, refusing: %s", path);
+ return -EINVAL;
+ }
+
+ last = last_path_component(path);
+ e = strrchr(last, '+');
+ if (!e) {
+ log_error("Path read from LoaderBootCountPath does not contain a counter, refusing: %s", path);
+ return -EINVAL;
+ }
+
+ if (ret_prefix) {
+ prefix = strndup(path, e - path);
+ if (!prefix)
+ return log_oom();
+ }
+
+ r = parse_counter(path, &e, &left, &done);
+ if (r < 0)
+ return r;
+
+ if (ret_suffix) {
+ suffix = strdup(e);
+ if (!suffix)
+ return log_oom();
+
+ *ret_suffix = TAKE_PTR(suffix);
+ }
+
+ if (ret_path)
+ *ret_path = TAKE_PTR(path);
+ if (ret_prefix)
+ *ret_prefix = TAKE_PTR(prefix);
+ if (ret_left)
+ *ret_left = left;
+ if (ret_done)
+ *ret_done = done;
+
+ return 0;
+}
+
+static int make_good(const char *prefix, const char *suffix, char **ret) {
+ _cleanup_free_ char *good = NULL;
+
+ assert(prefix);
+ assert(suffix);
+ assert(ret);
+
+ /* Generate the path we'd use on good boots. This one is easy. If we are successful, we simple drop the counter
+ * pair entirely from the name. After all, we know all is good, and the logs will contain information about the
+ * tries we needed to come here, hence it's safe to drop the counters from the name. */
+
+ good = strjoin(prefix, suffix);
+ if (!good)
+ return -ENOMEM;
+
+ *ret = TAKE_PTR(good);
+ return 0;
+}
+
+static int make_bad(const char *prefix, uint64_t done, const char *suffix, char **ret) {
+ _cleanup_free_ char *bad = NULL;
+
+ assert(prefix);
+ assert(suffix);
+ assert(ret);
+
+ /* Generate the path we'd use on bad boots. Let's simply set the 'left' counter to zero, and keep the 'done'
+ * counter. The information might be interesting to boot loaders, after all. */
+
+ if (done == 0) {
+ bad = strjoin(prefix, "+0", suffix);
+ if (!bad)
+ return -ENOMEM;
+ } else {
+ if (asprintf(&bad, "%s+0-%" PRIu64 "%s", prefix, done, suffix) < 0)
+ return -ENOMEM;
+ }
+
+ *ret = TAKE_PTR(bad);
+ return 0;
+}
+
+static const char *skip_slash(const char *path) {
+ assert(path);
+ assert(path[0] == '/');
+
+ return path + 1;
+}
+
+static int verb_status(int argc, char *argv[], void *userdata) {
+
+ _cleanup_free_ char *path = NULL, *prefix = NULL, *suffix = NULL, *good = NULL, *bad = NULL;
+ _cleanup_close_ int fd = -1;
+ uint64_t left, done;
+ int r;
+
+ r = acquire_boot_count_path(&path, &prefix, &left, &done, &suffix);
+ if (r == -EUNATCH) { /* No boot count in place, then let's consider this a "clean" boot, as "good", "bad" or "indeterminate" don't apply. */
+ puts("clean");
+ return 0;
+ }
+ if (r < 0)
+ return r;
+
+ r = acquire_esp();
+ if (r < 0)
+ return r;
+
+ r = make_good(prefix, suffix, &good);
+ if (r < 0)
+ return log_oom();
+
+ r = make_bad(prefix, done, suffix, &bad);
+ if (r < 0)
+ return log_oom();
+
+ log_debug("Booted file: %s%s\n"
+ "The same modified for 'good': %s%s\n"
+ "The same modified for 'bad': %s%s\n",
+ arg_path, path,
+ arg_path, good,
+ arg_path, bad);
+
+ log_debug("Tries left: %" PRIu64"\n"
+ "Tries done: %" PRIu64"\n",
+ left, done);
+
+ fd = open(arg_path, O_DIRECTORY|O_CLOEXEC|O_RDONLY);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to open ESP '%s': %m", arg_path);
+
+ if (faccessat(fd, skip_slash(path), F_OK, 0) >= 0) {
+ puts("indeterminate");
+ return 0;
+ }
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to check if '%s' exists: %m", path);
+
+ if (faccessat(fd, skip_slash(good), F_OK, 0) >= 0) {
+ puts("good");
+ return 0;
+ }
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to check if '%s' exists: %m", good);
+
+ if (faccessat(fd, skip_slash(bad), F_OK, 0) >= 0) {
+ puts("bad");
+ return 0;
+ }
+ if (errno != ENOENT)
+ return log_error_errno(errno, "Failed to check if '%s' exists: %m", bad);
+
+ return log_error_errno(errno, "Couldn't determine boot state: %m");
+}
+
+static int verb_set(int argc, char *argv[], void *userdata) {
+ _cleanup_free_ char *path = NULL, *prefix = NULL, *suffix = NULL, *good = NULL, *bad = NULL, *parent = NULL;
+ const char *target, *source1, *source2;
+ _cleanup_close_ int fd = -1;
+ uint64_t done;
+ int r;
+
+ r = acquire_boot_count_path(&path, &prefix, NULL, &done, &suffix);
+ if (r == -EUNATCH) /* acquire_boot_count_path() won't log on its own for this specific error */
+ return log_error_errno(r, "Not booted with boot counting in effect.");
+ if (r < 0)
+ return r;
+
+ r = acquire_esp();
+ if (r < 0)
+ return r;
+
+ r = make_good(prefix, suffix, &good);
+ if (r < 0)
+ return log_oom();
+
+ r = make_bad(prefix, done, suffix, &bad);
+ if (r < 0)
+ return log_oom();
+
+ fd = open(arg_path, O_DIRECTORY|O_CLOEXEC|O_RDONLY);
+ if (fd < 0)
+ return log_error_errno(errno, "Failed to open ESP '%s': %m", arg_path);
+
+ /* Figure out what rename to what */
+ if (streq(argv[0], "good")) {
+ target = good;
+ source1 = path;
+ source2 = bad; /* Maybe this boot was previously marked as 'bad'? */
+ } else if (streq(argv[0], "bad")) {
+ target = bad;
+ source1 = path;
+ source2 = good; /* Maybe this boot was previously marked as 'good'? */
+ } else {
+ assert(streq(argv[0], "indeterminate"));
+ target = path;
+ source1 = good;
+ source2 = bad;
+ }
+
+ r = rename_noreplace(fd, skip_slash(source1), fd, skip_slash(target));
+ if (r == -EEXIST)
+ goto exists;
+ else if (r == -ENOENT) {
+
+ r = rename_noreplace(fd, skip_slash(source2), fd, skip_slash(target));
+ if (r == -EEXIST)
+ goto exists;
+ else if (r == -ENOENT) {
+
+ if (access(target, F_OK) >= 0) /* Hmm, if we can't find either source file, maybe the destination already exists? */
+ goto exists;
+
+ return log_error_errno(r, "Can't find boot counter source file for '%s': %m", target);
+ } else if (r < 0)
+ return log_error_errno(r, "Failed to rename '%s' to '%s': %m", source2, target);
+ else
+ log_debug("Successfully renamed '%s' to '%s'.", source2, target);
+
+ } else if (r < 0)
+ return log_error_errno(r, "Failed to rename '%s' to '%s': %m", source1, target);
+ else
+ log_debug("Successfully renamed '%s' to '%s'.", source1, target);
+
+ /* First, fsync() the directory these files are located in */
+ parent = dirname_malloc(path);
+ if (!parent)
+ return log_oom();
+
+ r = fsync_path_at(fd, skip_slash(parent));
+ if (r < 0)
+ log_debug_errno(errno, "Failed to synchronize image directory, ignoring: %m");
+
+ /* Secondly, syncfs() the whole file system these files are located in */
+ if (syncfs(fd) < 0)
+ log_debug_errno(errno, "Failed to synchronize ESP, ignoring: %m");
+
+ log_info("Marked boot as '%s'. (Boot attempt counter is at %" PRIu64".)", argv[0], done);
+
+ return 1;
+
+exists:
+ log_debug("Operation already executed before, not doing anything.");
+ return 0;
+}
+
+int main(int argc, char *argv[]) {
+
+ static const Verb verbs[] = {
+ { "help", VERB_ANY, VERB_ANY, 0, help },
+ { "status", VERB_ANY, 1, VERB_DEFAULT, verb_status },
+ { "good", VERB_ANY, 1, VERB_MUST_BE_ROOT, verb_set },
+ { "bad", VERB_ANY, 1, VERB_MUST_BE_ROOT, verb_set },
+ { "indeterminate", VERB_ANY, 1, VERB_MUST_BE_ROOT, verb_set },
+ {}
+ };
+
+ int r;
+
+ log_parse_environment();
+ log_open();
+
+ r = parse_argv(argc, argv);
+ if (r <= 0)
+ goto finish;
+
+ if (detect_container() > 0) {
+ log_error("Marking a boot is not supported in containers.");
+ r = -EOPNOTSUPP;
+ goto finish;
+ }
+
+ if (!is_efi_boot()) {
+ log_error("Marking a boot is only supported on EFI systems.");
+ r = -EOPNOTSUPP;
+ goto finish;
+ }
+
+ r = dispatch_verb(argc, argv, verbs, NULL);
+
+finish:
+ free(arg_path);
+
+ return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
+}
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