systemd/SOURCES/0536-tpm2-add-tpm2_read_public.patch

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2024-04-30 11:42:21 +00:00
From 516a4e71a764f4f5e19dd8f2e19fb1a86aa0534b Mon Sep 17 00:00:00 2001
From: Dan Streetman <ddstreet@ieee.org>
Date: Wed, 17 May 2023 20:03:00 -0400
Subject: [PATCH] tpm2: add tpm2_read_public()
(cherry picked from commit 98d6a80942337f07183bc4039ce32dc188f4d4cd)
Related: RHEL-16182
---
src/shared/tpm2-util.c | 69 +++++++++++++++++++++++++++---------------
1 file changed, 45 insertions(+), 24 deletions(-)
diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
index 3278863f4d..edd871c632 100644
--- a/src/shared/tpm2-util.c
+++ b/src/shared/tpm2-util.c
@@ -721,6 +721,35 @@ static int tpm2_credit_random(Tpm2Context *c) {
return 0;
}
+static int tpm2_read_public(
+ Tpm2Context *c,
+ const Tpm2Handle *session,
+ const Tpm2Handle *handle,
+ TPM2B_PUBLIC **ret_public,
+ TPM2B_NAME **ret_name,
+ TPM2B_NAME **ret_qname) {
+
+ TSS2_RC rc;
+
+ assert(c);
+ assert(handle);
+
+ rc = sym_Esys_ReadPublic(
+ c->esys_context,
+ handle->esys_handle,
+ session ? session->esys_handle : ESYS_TR_NONE,
+ ESYS_TR_NONE,
+ ESYS_TR_NONE,
+ ret_public,
+ ret_name,
+ ret_qname);
+ if (rc != TSS2_RC_SUCCESS)
+ return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE),
+ "Failed to read public info: %s", sym_Tss2_RC_Decode(rc));
+
+ return 0;
+}
+
const TPM2B_PUBLIC *tpm2_get_primary_template(Tpm2SRKTemplateFlags flags) {
/*
@@ -825,7 +854,9 @@ const TPM2B_PUBLIC *tpm2_get_primary_template(Tpm2SRKTemplateFlags flags) {
static int tpm2_get_srk(
Tpm2Context *c,
const Tpm2Handle *session,
- TPMI_ALG_PUBLIC *ret_alg,
+ TPM2B_PUBLIC **ret_public,
+ TPM2B_NAME **ret_name,
+ TPM2B_NAME **ret_qname,
Tpm2Handle **ret_handle) {
int r;
@@ -837,37 +868,26 @@ static int tpm2_get_srk(
if (r < 0)
return r;
if (r == 0) { /* SRK not found */
- if (ret_alg)
- *ret_alg = TPM2_ALG_ERROR;
+ if (ret_public)
+ *ret_public = NULL;
+ if (ret_name)
+ *ret_name = NULL;
+ if (ret_qname)
+ *ret_qname = NULL;
if (ret_handle)
*ret_handle = NULL;
return 0;
}
- /* Get the algorithm if the caller wants it */
- _cleanup_(Esys_Freep) TPM2B_PUBLIC *out_public = NULL;
- if (ret_alg) {
- TSS2_RC rc = sym_Esys_ReadPublic(
- c->esys_context,
- handle->esys_handle,
- ESYS_TR_NONE,
- ESYS_TR_NONE,
- ESYS_TR_NONE,
- &out_public,
- NULL,
- NULL);
- if (rc != TSS2_RC_SUCCESS)
- return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE),
- "Failed to convert ray handle to ESYS_TR for SRK: %s",
- sym_Tss2_RC_Decode(rc));
+ if (ret_public || ret_name || ret_qname) {
+ r = tpm2_read_public(c, session, handle, ret_public, ret_name, ret_qname);
+ if (r < 0)
+ return r;
}
if (ret_handle)
*ret_handle = TAKE_PTR(handle);
- if (ret_alg)
- *ret_alg = out_public->publicArea.type;
-
return 1;
}
@@ -909,14 +929,15 @@ static int tpm2_make_primary(
/* Find existing SRK and use it if present */
if (use_srk_model) {
- TPMI_ALG_PUBLIC got_alg = TPM2_ALG_NULL;
- r = tpm2_get_srk(c, NULL, &got_alg, &primary);
+ _cleanup_(Esys_Freep) TPM2B_PUBLIC *primary_public = NULL;
+ r = tpm2_get_srk(c, NULL, &primary_public, NULL, NULL, &primary);
if (r < 0)
return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE),
"Failed to establish if SRK is present");
if (r == 1) {
log_debug("Discovered existing SRK");
+ TPMI_ALG_PUBLIC got_alg = primary_public->publicArea.type;
if (alg != 0 && alg != got_alg)
log_warning("Caller asked for specific algorithm %u, but existing SRK is %u, ignoring",
alg, got_alg);