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122 lines
5.0 KiB
122 lines
5.0 KiB
From 8f899f5abca4c233cf9679c74cbd3839a03e77c2 Mon Sep 17 00:00:00 2001
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From: Dan Streetman <ddstreet@ieee.org>
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Date: Fri, 8 Sep 2023 13:14:38 -0400
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Subject: [PATCH] tpm2: cache TPM's supported ECC curves
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This brings the tpm2_supports_ecc_curve() api in line with the other
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tpm2_supports_*() functions, of returning a boolean.
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(cherry picked from commit 639dca030bc14b71b3dba0a486f282de316b3e65)
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Related: RHEL-16182
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---
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src/shared/tpm2-util.c | 57 +++++++++++++++++++++++++++++++-----------
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src/shared/tpm2-util.h | 3 +++
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2 files changed, 45 insertions(+), 15 deletions(-)
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diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
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index 01deb6ebac..966b524000 100644
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--- a/src/shared/tpm2-util.c
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+++ b/src/shared/tpm2-util.c
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@@ -282,6 +282,39 @@ static int tpm2_cache_capabilities(Tpm2Context *c) {
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current_cc = TPMA_CC_TO_TPM2_CC(commands.commandAttributes[commands.count - 1]) + 1;
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}
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+ /* Cache the ECC curves. The spec isn't actually clear if ECC curves can be added/removed
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+ * while running, but that would be crazy, so let's hope it is not possible. */
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+ TPM2_ECC_CURVE current_ecc_curve = TPM2_ECC_NONE;
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+ for (;;) {
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+ r = tpm2_get_capability(
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+ c,
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+ TPM2_CAP_ECC_CURVES,
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+ current_ecc_curve,
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+ TPM2_MAX_ECC_CURVES,
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+ &capability);
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+ if (r < 0)
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+ return r;
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+
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+ TPML_ECC_CURVE ecc_curves = capability.eccCurves;
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+
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+ /* ECC support isn't required */
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+ if (ecc_curves.count == 0)
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+ break;
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+
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+ if (!GREEDY_REALLOC_APPEND(
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+ c->capability_ecc_curves,
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+ c->n_capability_ecc_curves,
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+ ecc_curves.eccCurves,
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+ ecc_curves.count))
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+ return log_oom_debug();
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+
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+ if (r == 0)
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+ break;
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+
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+ /* Set current_ecc_curve to index after last ecc curve the TPM provided */
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+ current_ecc_curve = ecc_curves.eccCurves[ecc_curves.count - 1] + 1;
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+ }
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+
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/* Cache the PCR capabilities, which are safe to cache, as the only way they can change is
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* TPM2_PCR_Allocate(), which changes the allocation after the next _TPM_Init(). If the TPM is
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* reinitialized while we are using it, all our context and sessions will be invalid, so we can
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@@ -351,23 +384,16 @@ bool tpm2_supports_command(Tpm2Context *c, TPM2_CC command) {
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return tpm2_get_capability_command(c, command, NULL);
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}
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-/* Returns 1 if the TPM supports the ECC curve, 0 if not, or < 0 for any error. */
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-static int tpm2_supports_ecc_curve(Tpm2Context *c, TPM2_ECC_CURVE curve) {
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- TPMU_CAPABILITIES capability;
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- int r;
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-
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- /* The spec explicitly states the TPM2_ECC_CURVE should be cast to uint32_t. */
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- r = tpm2_get_capability(c, TPM2_CAP_ECC_CURVES, (uint32_t) curve, 1, &capability);
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- if (r < 0)
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- return r;
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+/* Returns true if the TPM supports the ECC curve, otherwise false. */
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+bool tpm2_supports_ecc_curve(Tpm2Context *c, TPM2_ECC_CURVE ecc_curve) {
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+ assert(c);
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- TPML_ECC_CURVE eccCurves = capability.eccCurves;
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- if (eccCurves.count == 0 || eccCurves.eccCurves[0] != curve) {
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- log_debug("TPM does not support ECC curve 0x%02" PRIx16 ".", curve);
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- return 0;
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- }
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+ FOREACH_ARRAY(curve, c->capability_ecc_curves, c->n_capability_ecc_curves)
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+ if (*curve == ecc_curve)
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+ return true;
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- return 1;
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+ log_debug("TPM does not support ECC curve 0x%" PRIx16 ".", ecc_curve);
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+ return false;
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}
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/* Query the TPM for populated handles.
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@@ -515,6 +541,7 @@ static Tpm2Context *tpm2_context_free(Tpm2Context *c) {
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c->capability_algorithms = mfree(c->capability_algorithms);
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c->capability_commands = mfree(c->capability_commands);
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+ c->capability_ecc_curves = mfree(c->capability_ecc_curves);
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return mfree(c);
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}
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diff --git a/src/shared/tpm2-util.h b/src/shared/tpm2-util.h
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index d8a221a7d6..26050c9c55 100644
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--- a/src/shared/tpm2-util.h
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+++ b/src/shared/tpm2-util.h
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@@ -47,6 +47,8 @@ typedef struct {
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size_t n_capability_algorithms;
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TPMA_CC *capability_commands;
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size_t n_capability_commands;
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+ TPM2_ECC_CURVE *capability_ecc_curves;
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+ size_t n_capability_ecc_curves;
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TPML_PCR_SELECTION capability_pcrs;
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} Tpm2Context;
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@@ -103,6 +105,7 @@ int tpm2_create_loaded(Tpm2Context *c, const Tpm2Handle *parent, const Tpm2Handl
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bool tpm2_supports_alg(Tpm2Context *c, TPM2_ALG_ID alg);
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bool tpm2_supports_command(Tpm2Context *c, TPM2_CC command);
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+bool tpm2_supports_ecc_curve(Tpm2Context *c, TPM2_ECC_CURVE ecc_curve);
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bool tpm2_test_parms(Tpm2Context *c, TPMI_ALG_PUBLIC alg, const TPMU_PUBLIC_PARMS *parms);
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