You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
130 lines
4.5 KiB
130 lines
4.5 KiB
From 62b9997afb850843f8fa52c66c3320f0f969d400 Mon Sep 17 00:00:00 2001
|
|
From: Lennart Poettering <lennart@poettering.net>
|
|
Date: Tue, 11 Oct 2022 18:07:46 +0200
|
|
Subject: [PATCH] tpm2-util: split out code that derives "good" TPM2 banks into
|
|
an strv from pcrphase and generalize it in tpm2-util.c
|
|
|
|
That way we can reuse it later from different places.
|
|
|
|
(cherry picked from commit e4481cc512f48d423115b10d4ae1c8e1381ff84b)
|
|
|
|
Related: RHEL-16182
|
|
---
|
|
src/boot/pcrphase.c | 28 ++++++---------------------
|
|
src/shared/tpm2-util.c | 43 ++++++++++++++++++++++++++++++++++++++++++
|
|
src/shared/tpm2-util.h | 1 +
|
|
3 files changed, 50 insertions(+), 22 deletions(-)
|
|
|
|
diff --git a/src/boot/pcrphase.c b/src/boot/pcrphase.c
|
|
index 8e91e80e22..6e3a564f35 100644
|
|
--- a/src/boot/pcrphase.c
|
|
+++ b/src/boot/pcrphase.c
|
|
@@ -123,35 +123,19 @@ static int parse_argv(int argc, char *argv[]) {
|
|
}
|
|
|
|
static int determine_banks(struct tpm2_context *c) {
|
|
- _cleanup_free_ TPMI_ALG_HASH *algs = NULL;
|
|
- int n_algs, r;
|
|
+ _cleanup_strv_free_ char **l = NULL;
|
|
+ int r;
|
|
|
|
assert(c);
|
|
|
|
if (!strv_isempty(arg_banks)) /* Explicitly configured? Then use that */
|
|
return 0;
|
|
|
|
- n_algs = tpm2_get_good_pcr_banks(c->esys_context, UINT32_C(1) << TPM_PCR_INDEX_KERNEL_IMAGE, &algs);
|
|
- if (n_algs <= 0)
|
|
- return n_algs;
|
|
-
|
|
- for (int i = 0; i < n_algs; i++) {
|
|
- const EVP_MD *implementation;
|
|
- const char *salg;
|
|
-
|
|
- salg = tpm2_pcr_bank_to_string(algs[i]);
|
|
- if (!salg)
|
|
- return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE), "TPM2 operates with unknown PCR algorithm, can't measure.");
|
|
-
|
|
- implementation = EVP_get_digestbyname(salg);
|
|
- if (!implementation)
|
|
- return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE), "TPM2 operates with unsupported PCR algorithm, can't measure.");
|
|
-
|
|
- r = strv_extend(&arg_banks, EVP_MD_name(implementation));
|
|
- if (r < 0)
|
|
- return log_oom();
|
|
- }
|
|
+ r = tpm2_get_good_pcr_banks_strv(c->esys_context, UINT32_C(1) << TPM_PCR_INDEX_KERNEL_IMAGE, &l);
|
|
+ if (r < 0)
|
|
+ return r;
|
|
|
|
+ strv_free_and_replace(arg_banks, l);
|
|
return 0;
|
|
}
|
|
|
|
diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
|
|
index 8171b3e9e9..45ece9d1a6 100644
|
|
--- a/src/shared/tpm2-util.c
|
|
+++ b/src/shared/tpm2-util.c
|
|
@@ -730,6 +730,49 @@ int tpm2_get_good_pcr_banks(
|
|
return 0;
|
|
}
|
|
|
|
+int tpm2_get_good_pcr_banks_strv(
|
|
+ ESYS_CONTEXT *c,
|
|
+ uint32_t pcr_mask,
|
|
+ char ***ret) {
|
|
+
|
|
+ _cleanup_free_ TPMI_ALG_HASH *algs = NULL;
|
|
+ _cleanup_strv_free_ char **l = NULL;
|
|
+ int n_algs;
|
|
+
|
|
+ assert(c);
|
|
+ assert(ret);
|
|
+
|
|
+ n_algs = tpm2_get_good_pcr_banks(c, pcr_mask, &algs);
|
|
+ if (n_algs < 0)
|
|
+ return n_algs;
|
|
+
|
|
+ for (int i = 0; i < n_algs; i++) {
|
|
+ _cleanup_free_ char *n = NULL;
|
|
+ const EVP_MD *implementation;
|
|
+ const char *salg;
|
|
+
|
|
+ salg = tpm2_pcr_bank_to_string(algs[i]);
|
|
+ if (!salg)
|
|
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE), "TPM2 operates with unknown PCR algorithm, can't measure.");
|
|
+
|
|
+ implementation = EVP_get_digestbyname(salg);
|
|
+ if (!implementation)
|
|
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE), "TPM2 operates with unsupported PCR algorithm, can't measure.");
|
|
+
|
|
+ n = strdup(ASSERT_PTR(EVP_MD_name(implementation)));
|
|
+ if (!n)
|
|
+ return log_oom();
|
|
+
|
|
+ ascii_strlower(n); /* OpenSSL uses uppercase digest names, we prefer them lower case. */
|
|
+
|
|
+ if (strv_consume(&l, TAKE_PTR(n)) < 0)
|
|
+ return log_oom();
|
|
+ }
|
|
+
|
|
+ *ret = TAKE_PTR(l);
|
|
+ return 0;
|
|
+}
|
|
+
|
|
static void hash_pin(const char *pin, size_t len, TPM2B_AUTH *auth) {
|
|
struct sha256_ctx hash;
|
|
|
|
diff --git a/src/shared/tpm2-util.h b/src/shared/tpm2-util.h
|
|
index c240335ae6..6d83281be0 100644
|
|
--- a/src/shared/tpm2-util.h
|
|
+++ b/src/shared/tpm2-util.h
|
|
@@ -68,6 +68,7 @@ static inline void Esys_Freep(void *p) {
|
|
}
|
|
|
|
int tpm2_get_good_pcr_banks(ESYS_CONTEXT *c, uint32_t pcr_mask, TPMI_ALG_HASH **ret_banks);
|
|
+int tpm2_get_good_pcr_banks_strv(ESYS_CONTEXT *c, uint32_t pcr_mask, char ***ret);
|
|
|
|
#else
|
|
struct tpm2_context;
|