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boot: measure loader.conf in PCR5
Results in: - EventNum: 26 PCRIndex: 5 EventType: EV_EVENT_TAG DigestCount: 4 Digests: - AlgorithmId: sha1 Digest: 155fb999ca61ba8c7b1f1d87cee821f772ef084a - AlgorithmId: sha256 Digest: 4c26adf231603613afc00bb3d5cad046aec6a525ca01262417c7085caab452b5 - AlgorithmId: sha384 Digest: 3e0758cb6605ac274e55d747bf29ee3474fc4413cd5e7a451d1375219cd7f08a30fc915a8df7131657ca78b82b9ccec8 - AlgorithmId: sha512 Digest: e32d905b9092c543802f386db9a397d9b6593bdb8360fb747a6d23e491a09595fec8699184cc790d0873a3d52ed16d045538f0c73ece48278fae0fb6ed9b4ed6 EventSize: 32 Event: 2a58bcf5180000006c006f0061006400650072002e0063006f006e0066000000
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@ -16,8 +16,8 @@ measurements listed below are (by default) only done if a system is booted with
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to systemd's UEFI-mode measurements, and if the latter are not done the former
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aren't made either.
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systemd will measure to PCRs 11 (`kernel-boot`), 12 (`kernel-config`), 13
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(`sysexts`), 15 (`system-identity`).
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systemd will measure to PCRs 5 (`boot-loader-config`), 11 (`kernel-boot`),
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12 (`kernel-config`), 13 (`sysexts`), 15 (`system-identity`).
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Currently, four components will issue TPM2 PCR measurements:
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@ -31,6 +31,17 @@ maintained in `/run/log/systemd/tpm2-measure.log`.
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## PCR Measurements Made by `systemd-boot` (UEFI)
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### PCS 5, `EV_EVENT_TAG`, "loader.conf"
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The content of `systemd-boot`'s configuration file, `loader/loader.conf`, is
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measured as a tagged event.
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→ **Event Tag** `0xf5bc582a`
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→ **Description** in the event log record is the file name, `loader.conf`.
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→ **Measured hash** covers the content of `loader.conf` as it is read from the ESP.
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### PCR 12, `EV_IPL`, "Kernel Command Line"
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If the kernel command line was specified explicitly (by the user or in a Boot
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@ -21,6 +21,7 @@
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#include "secure-boot.h"
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#include "shim.h"
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#include "ticks.h"
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#include "tpm2-pcr.h"
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#include "util.h"
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#include "version.h"
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#include "vmm.h"
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@ -38,6 +39,8 @@ DECLARE_NOALLOC_SECTION(
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DECLARE_SBAT(SBAT_BOOT_SECTION_TEXT);
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#define LOADER_CONF_CONTENT_EVENT_TAG_ID UINT32_C(0xf5bc582a)
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typedef enum LoaderType {
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LOADER_UNDEFINED,
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LOADER_AUTO,
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@ -1621,7 +1624,7 @@ static EFI_STATUS efivar_get_timeout(const char16_t *var, uint32_t *ret_value) {
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static void config_load_defaults(Config *config, EFI_FILE *root_dir) {
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_cleanup_free_ char *content = NULL;
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size_t value = 0; /* avoid false maybe-uninitialized warning */
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size_t content_size, value = 0; /* avoid false maybe-uninitialized warning */
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EFI_STATUS err;
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assert(root_dir);
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@ -1638,9 +1641,19 @@ static void config_load_defaults(Config *config, EFI_FILE *root_dir) {
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.timeout_sec_efivar = TIMEOUT_UNSET,
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};
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err = file_read(root_dir, u"\\loader\\loader.conf", 0, 0, &content, NULL);
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if (err == EFI_SUCCESS)
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err = file_read(root_dir, u"\\loader\\loader.conf", 0, 0, &content, &content_size);
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if (err == EFI_SUCCESS) {
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config_defaults_load_from_file(config, content);
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err = tpm_log_tagged_event(
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TPM2_PCR_BOOT_LOADER_CONFIG,
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POINTER_TO_PHYSICAL_ADDRESS(content),
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content_size,
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LOADER_CONF_CONTENT_EVENT_TAG_ID,
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u"loader.conf",
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/* ret_measured= */ NULL);
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if (err != EFI_SUCCESS)
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log_error_status(err, "Error measuring loader.conf into TPM: %m");
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}
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err = efivar_get_timeout(u"LoaderConfigTimeout", &config->timeout_sec_efivar);
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if (err == EFI_SUCCESS)
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