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205 lines
7.7 KiB
205 lines
7.7 KiB
6 months ago
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From 42b51de62cf4f4bbb92ef63deaa4cd9181f21beb Mon Sep 17 00:00:00 2001
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From: Dan Streetman <ddstreet@ieee.org>
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Date: Thu, 8 Dec 2022 16:57:47 -0500
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Subject: [PATCH] tpm2: move openssl-required ifdef code out of policy-building
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function
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(cherry picked from commit 958982415808eeec956e79c4f7ca030af5af1b71)
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Related: RHEL-16182
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---
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src/shared/tpm2-util.c | 98 +++++++++++++++++++++++++-----------------
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1 file changed, 58 insertions(+), 40 deletions(-)
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diff --git a/src/shared/tpm2-util.c b/src/shared/tpm2-util.c
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index 722ae3ca9c..ea04d0a892 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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@@ -1262,21 +1262,38 @@ static int tpm2_make_encryption_session(
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return 0;
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}
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+static int openssl_pubkey_to_tpm2_pubkey(
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+ const void *pubkey,
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+ size_t pubkey_size,
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+ TPM2B_PUBLIC *output,
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+ void **ret_fp,
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+ size_t *ret_fp_size) {
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+
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#if HAVE_OPENSSL
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-static int openssl_pubkey_to_tpm2_pubkey(EVP_PKEY *input, TPM2B_PUBLIC *output) {
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#if OPENSSL_VERSION_MAJOR >= 3
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_cleanup_(BN_freep) BIGNUM *n = NULL, *e = NULL;
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#else
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const BIGNUM *n = NULL, *e = NULL;
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const RSA *rsa = NULL;
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#endif
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- int n_bytes, e_bytes;
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+ int r, n_bytes, e_bytes;
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- assert(input);
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+ assert(pubkey);
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+ assert(pubkey_size > 0);
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assert(output);
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/* Converts an OpenSSL public key to a structure that the TPM chip can process. */
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+ _cleanup_fclose_ FILE *f = NULL;
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+ f = fmemopen((void*) pubkey, pubkey_size, "r");
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+ if (!f)
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+ return log_oom();
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+
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+ _cleanup_(EVP_PKEY_freep) EVP_PKEY *input = NULL;
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+ input = PEM_read_PUBKEY(f, NULL, NULL, NULL);
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+ if (!input)
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+ return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse PEM public key.");
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+
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if (EVP_PKEY_base_id(input) != EVP_PKEY_RSA)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Provided public key is not an RSA key.");
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@@ -1343,22 +1360,38 @@ static int openssl_pubkey_to_tpm2_pubkey(EVP_PKEY *input, TPM2B_PUBLIC *output)
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if (BN_bn2bin(e, (unsigned char*) &output->publicArea.parameters.rsaDetail.exponent) <= 0)
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to convert RSA exponent.");
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+ if (ret_fp) {
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+ _cleanup_free_ void *fp = NULL;
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+ size_t fp_size;
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+
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+ assert(ret_fp_size);
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+
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+ r = pubkey_fingerprint(input, EVP_sha256(), &fp, &fp_size);
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+ if (r < 0)
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+ return log_error_errno(r, "Failed to calculate public key fingerprint: %m");
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+
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+ *ret_fp = TAKE_PTR(fp);
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+ *ret_fp_size = fp_size;
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+ }
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+
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return 0;
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+#else /* HAVE_OPENSSL */
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+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "OpenSSL support is disabled.");
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+#endif
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}
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static int find_signature(
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JsonVariant *v,
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- uint16_t pcr_bank,
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- uint32_t pcr_mask,
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- EVP_PKEY *pk,
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+ const TPML_PCR_SELECTION *pcr_selection,
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+ const void *fp,
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+ size_t fp_size,
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const void *policy,
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size_t policy_size,
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void *ret_signature,
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size_t *ret_signature_size) {
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- _cleanup_free_ void *fp = NULL;
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+#if HAVE_OPENSSL
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JsonVariant *b, *i;
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- size_t fp_size;
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const char *k;
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int r;
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@@ -1368,6 +1401,12 @@ static int find_signature(
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if (!json_variant_is_object(v))
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return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Signature is not a JSON object.");
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+ uint16_t pcr_bank = pcr_selection->pcrSelections[0].hash;
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+ uint32_t pcr_mask;
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+ r = tpm2_tpml_pcr_selection_to_mask(pcr_selection, pcr_bank, &pcr_mask);
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+ if (r < 0)
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+ return r;
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+
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k = tpm2_hash_alg_to_string(pcr_bank);
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if (!k)
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return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "Don't know PCR bank %" PRIu16, pcr_bank);
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@@ -1411,12 +1450,6 @@ static int find_signature(
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if (r < 0)
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return log_error_errno(r, "Failed to decode fingerprint in JSON data: %m");
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- if (!fp) {
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- r = pubkey_fingerprint(pk, EVP_sha256(), &fp, &fp_size);
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- if (r < 0)
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- return log_error_errno(r, "Failed to calculate public key fingerprint: %m");
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- }
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-
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if (memcmp_nn(fp, fp_size, fpj_data, fpj_size) != 0)
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continue; /* Not for this public key */
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@@ -1441,8 +1474,10 @@ static int find_signature(
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}
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return log_error_errno(SYNTHETIC_ERRNO(ENXIO), "Couldn't find signature for this PCR bank, PCR index and public key.");
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-}
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+#else /* HAVE_OPENSSL */
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+ return log_error_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "OpenSSL support is disabled.");
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#endif
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+}
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static int tpm2_make_policy_session(
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Tpm2Context *c,
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@@ -1504,21 +1539,6 @@ static int tpm2_make_policy_session(
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}
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}
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-#if HAVE_OPENSSL
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- _cleanup_(EVP_PKEY_freep) EVP_PKEY *pk = NULL;
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- if (pubkey_size > 0) {
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- /* If a pubkey is specified, load it to validate it, even if the PCR mask for this is
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- * actually zero, and we are thus not going to use it. */
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- _cleanup_fclose_ FILE *f = fmemopen((void*) pubkey, pubkey_size, "r");
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- if (!f)
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- return log_oom();
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-
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- pk = PEM_read_PUBKEY(f, NULL, NULL, NULL);
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- if (!pk)
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- return log_error_errno(SYNTHETIC_ERRNO(EINVAL), "Failed to parse PEM public key.");
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- }
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-#endif
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-
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_cleanup_tpm2_handle_ Tpm2Handle *session = NULL;
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r = tpm2_handle_new(c, &session);
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if (r < 0)
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@@ -1541,12 +1561,14 @@ static int tpm2_make_policy_session(
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"Failed to open session in TPM: %s", sym_Tss2_RC_Decode(rc));
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if (pubkey_pcr_mask != 0) {
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-#if HAVE_OPENSSL
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+ _cleanup_free_ void *fp = NULL;
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+ size_t fp_size = 0;
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+ TPM2B_PUBLIC pubkey_tpm2;
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+
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log_debug("Configuring public key based PCR policy.");
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- /* First: load public key into the TPM */
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- TPM2B_PUBLIC pubkey_tpm2;
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- r = openssl_pubkey_to_tpm2_pubkey(pk, &pubkey_tpm2);
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+ /* Convert the PEM key to TPM2 format */
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+ r = openssl_pubkey_to_tpm2_pubkey(pubkey, pubkey_size, &pubkey_tpm2, &fp, &fp_size);
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if (r < 0)
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return r;
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@@ -1614,9 +1636,8 @@ static int tpm2_make_policy_session(
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r = find_signature(
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signature_json,
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- pcr_bank,
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- pubkey_pcr_mask,
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- pk,
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+ &pcr_selection,
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+ fp, fp_size,
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approved_policy->buffer,
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approved_policy->size,
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&signature_raw,
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@@ -1680,9 +1701,6 @@ static int tpm2_make_policy_session(
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if (rc != TSS2_RC_SUCCESS)
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return log_error_errno(SYNTHETIC_ERRNO(ENOTRECOVERABLE),
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"Failed to push Authorize policy into TPM: %s", sym_Tss2_RC_Decode(rc));
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-#else
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- return log_debug_errno(SYNTHETIC_ERRNO(EOPNOTSUPP), "OpenSSL support is disabled.");
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-#endif
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}
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if (hash_pcr_mask != 0) {
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