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172 lines
7.3 KiB
172 lines
7.3 KiB
From 6fb21c25c859d950c1d9ab3b954573e87e87e64a Mon Sep 17 00:00:00 2001
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From: Lennart Poettering <lennart@poettering.net>
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Date: Tue, 20 Dec 2022 18:03:06 +0100
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Subject: [PATCH] bootctl: split out setting of system token into function of
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its own
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Let's break a huge function in two. No code change, just some
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refactoring.
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(cherry picked from commit 54978e3f3b5394d26f53f4753bb1c9e3e5811408)
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Related: RHEL-16952
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---
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src/boot/bootctl.c | 132 +++++++++++++++++++++++----------------------
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1 file changed, 69 insertions(+), 63 deletions(-)
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diff --git a/src/boot/bootctl.c b/src/boot/bootctl.c
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index 3833e755b1..00e8eda992 100644
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--- a/src/boot/bootctl.c
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+++ b/src/boot/bootctl.c
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@@ -1984,12 +1984,79 @@ static int verb_list(int argc, char *argv[], void *userdata) {
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return show_boot_entries(&config, arg_json_format_flags);
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}
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+static int set_system_token(void) {
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+ uint8_t buffer[RANDOM_EFI_SEED_SIZE];
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+ size_t token_size;
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+ int r;
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+
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+ if (!arg_touch_variables)
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+ return 0;
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+
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+ if (arg_root) {
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+ log_warning("Acting on %s, skipping EFI variable setup.",
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+ arg_image ? "image" : "root directory");
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+ return 0;
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+ }
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+
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+ if (!is_efi_boot()) {
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+ log_notice("Not booted with EFI, skipping EFI variable setup.");
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+ return 0;
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+ }
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+
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+ r = getenv_bool("SYSTEMD_WRITE_SYSTEM_TOKEN");
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+ if (r < 0) {
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+ if (r != -ENXIO)
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+ log_warning_errno(r, "Failed to parse $SYSTEMD_WRITE_SYSTEM_TOKEN, ignoring.");
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+ } else if (r == 0) {
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+ log_notice("Not writing system token, because $SYSTEMD_WRITE_SYSTEM_TOKEN is set to false.");
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+ return 0;
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+ }
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+
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+ r = efi_get_variable(EFI_LOADER_VARIABLE(LoaderSystemToken), NULL, NULL, &token_size);
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+ if (r == -ENODATA)
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+ log_debug_errno(r, "LoaderSystemToken EFI variable is invalid (too short?), replacing.");
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+ else if (r < 0) {
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+ if (r != -ENOENT)
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+ return log_error_errno(r, "Failed to test system token validity: %m");
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+ } else {
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+ if (token_size >= sizeof(buffer)) {
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+ /* Let's avoid writes if we can, and initialize this only once. */
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+ log_debug("System token already written, not updating.");
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+ return 0;
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+ }
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+
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+ log_debug("Existing system token size (%zu) does not match our expectations (%zu), replacing.", token_size, sizeof(buffer));
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+ }
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+
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+ r = crypto_random_bytes(buffer, sizeof(buffer));
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+ if (r < 0)
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+ return log_error_errno(r, "Failed to acquire random seed: %m");
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+
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+ /* Let's write this variable with an umask in effect, so that unprivileged users can't see the token
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+ * and possibly get identification information or too much insight into the kernel's entropy pool
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+ * state. */
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+ RUN_WITH_UMASK(0077) {
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+ r = efi_set_variable(EFI_LOADER_VARIABLE(LoaderSystemToken), buffer, sizeof(buffer));
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+ if (r < 0) {
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+ if (!arg_graceful)
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+ return log_error_errno(r, "Failed to write 'LoaderSystemToken' EFI variable: %m");
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+
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+ if (r == -EINVAL)
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+ log_notice_errno(r, "Unable to write 'LoaderSystemToken' EFI variable (firmware problem?), ignoring: %m");
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+ else
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+ log_notice_errno(r, "Unable to write 'LoaderSystemToken' EFI variable, ignoring: %m");
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+ } else
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+ log_info("Successfully initialized system token in EFI variable with %zu bytes.", sizeof(buffer));
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+ }
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+
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+ return 0;
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+}
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+
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static int install_random_seed(const char *esp) {
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_cleanup_close_ int esp_fd = -EBADF, loader_dir_fd = -EBADF, fd = -EBADF;
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_cleanup_free_ char *tmp = NULL;
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uint8_t buffer[RANDOM_EFI_SEED_SIZE];
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struct sha256_ctx hash_state;
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- size_t token_size;
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bool refreshed;
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int r;
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@@ -2066,68 +2133,7 @@ static int install_random_seed(const char *esp) {
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log_info("Random seed file %s/loader/random-seed successfully %s (%zu bytes).", esp, refreshed ? "refreshed" : "written", sizeof(buffer));
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- if (!arg_touch_variables)
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- return 0;
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-
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- if (!is_efi_boot()) {
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- log_notice("Not booted with EFI, skipping EFI variable setup.");
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- return 0;
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- }
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-
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- if (arg_root) {
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- log_warning("Acting on %s, skipping EFI variable setup.",
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- arg_image ? "image" : "root directory");
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- return 0;
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- }
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-
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- r = getenv_bool("SYSTEMD_WRITE_SYSTEM_TOKEN");
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- if (r < 0) {
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- if (r != -ENXIO)
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- log_warning_errno(r, "Failed to parse $SYSTEMD_WRITE_SYSTEM_TOKEN, ignoring.");
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- } else if (r == 0) {
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- log_notice("Not writing system token, because $SYSTEMD_WRITE_SYSTEM_TOKEN is set to false.");
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- return 0;
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- }
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-
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- r = efi_get_variable(EFI_LOADER_VARIABLE(LoaderSystemToken), NULL, NULL, &token_size);
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- if (r == -ENODATA)
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- log_debug_errno(r, "LoaderSystemToken EFI variable is invalid (too short?), replacing.");
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- else if (r < 0) {
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- if (r != -ENOENT)
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- return log_error_errno(r, "Failed to test system token validity: %m");
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- } else {
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- if (token_size >= sizeof(buffer)) {
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- /* Let's avoid writes if we can, and initialize this only once. */
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- log_debug("System token already written, not updating.");
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- return 0;
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- }
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-
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- log_debug("Existing system token size (%zu) does not match our expectations (%zu), replacing.", token_size, sizeof(buffer));
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- }
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-
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- r = crypto_random_bytes(buffer, sizeof(buffer));
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- if (r < 0)
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- return log_error_errno(r, "Failed to acquire random seed: %m");
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-
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- /* Let's write this variable with an umask in effect, so that unprivileged users can't see the token
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- * and possibly get identification information or too much insight into the kernel's entropy pool
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- * state. */
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- RUN_WITH_UMASK(0077) {
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- r = efi_set_variable(EFI_LOADER_VARIABLE(LoaderSystemToken), buffer, sizeof(buffer));
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- if (r < 0) {
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- if (!arg_graceful)
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- return log_error_errno(r, "Failed to write 'LoaderSystemToken' EFI variable: %m");
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-
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- if (r == -EINVAL)
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- log_notice_errno(r, "Unable to write 'LoaderSystemToken' EFI variable (firmware problem?), ignoring: %m");
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- else
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- log_notice_errno(r, "Unable to write 'LoaderSystemToken' EFI variable, ignoring: %m");
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- } else
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- log_info("Successfully initialized system token in EFI variable with %zu bytes.", sizeof(buffer));
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- }
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-
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- return 0;
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-
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+ return set_system_token();
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fail:
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if (tmp)
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(void) unlinkat(loader_dir_fd, tmp, 0);
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