forked from rpms/openssl
113 lines
4.4 KiB
Diff
113 lines
4.4 KiB
Diff
From e1eba21921ceeffa45ffd2115868c14e4c7fb8d9 Mon Sep 17 00:00:00 2001
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From: Clemens Lang <cllang@redhat.com>
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Date: Thu, 17 Nov 2022 18:08:24 +0100
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Subject: [PATCH] hmac: Add explicit FIPS indicator for key length
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NIST SP 800-131Ar2, table 9 "Approval Status of MAC Algorithms"
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specifies key lengths < 112 bytes are disallowed for HMAC generation and
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are legacy use for HMAC verification.
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Add an explicit indicator that will mark shorter key lengths as
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unsupported. The indicator can be queries from the EVP_MAC_CTX object
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using EVP_MAC_CTX_get_params() with the
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OSSL_MAC_PARAM_REDHAT_FIPS_INDICATOR
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parameter.
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Signed-off-by: Clemens Lang <cllang@redhat.com>
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---
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include/crypto/evp.h | 7 +++++++
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include/openssl/core_names.h | 1 +
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include/openssl/evp.h | 3 +++
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providers/implementations/macs/hmac_prov.c | 17 +++++++++++++++++
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4 files changed, 28 insertions(+)
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diff --git a/include/crypto/evp.h b/include/crypto/evp.h
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index 76fb990de4..1e2240516e 100644
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--- a/include/crypto/evp.h
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+++ b/include/crypto/evp.h
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@@ -196,6 +196,13 @@ const EVP_PKEY_METHOD *ossl_ed448_pkey_method(void);
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const EVP_PKEY_METHOD *ossl_rsa_pkey_method(void);
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const EVP_PKEY_METHOD *ossl_rsa_pss_pkey_method(void);
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+#ifdef FIPS_MODULE
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+/* NIST SP 800-131Ar2, Table 9: Approval Status of MAC Algorithms specifies key
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+ * lengths < 112 bytes are disallowed for HMAC generation and legacy use for
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+ * HMAC verification. */
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+# define EVP_HMAC_GEN_FIPS_MIN_KEY_LEN (112 / 8)
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+#endif
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+
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struct evp_mac_st {
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OSSL_PROVIDER *prov;
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int name_id;
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diff --git a/include/openssl/core_names.h b/include/openssl/core_names.h
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index c019afbbb0..94fab83193 100644
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--- a/include/openssl/core_names.h
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+++ b/include/openssl/core_names.h
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@@ -173,6 +173,7 @@ extern "C" {
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#define OSSL_MAC_PARAM_SIZE "size" /* size_t */
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#define OSSL_MAC_PARAM_BLOCK_SIZE "block-size" /* size_t */
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#define OSSL_MAC_PARAM_TLS_DATA_SIZE "tls-data-size" /* size_t */
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+#define OSSL_MAC_PARAM_REDHAT_FIPS_INDICATOR "redhat-fips-indicator"
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/* Known MAC names */
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#define OSSL_MAC_NAME_BLAKE2BMAC "BLAKE2BMAC"
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diff --git a/include/openssl/evp.h b/include/openssl/evp.h
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index 49e8e1df78..a5e78efd6e 100644
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--- a/include/openssl/evp.h
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+++ b/include/openssl/evp.h
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@@ -1192,6 +1192,9 @@ void EVP_MD_do_all_provided(OSSL_LIB_CTX *libctx,
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void *arg);
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/* MAC stuff */
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+# define EVP_MAC_REDHAT_FIPS_INDICATOR_UNDETERMINED 0
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+# define EVP_MAC_REDHAT_FIPS_INDICATOR_APPROVED 1
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+# define EVP_MAC_REDHAT_FIPS_INDICATOR_NOT_APPROVED 2
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EVP_MAC *EVP_MAC_fetch(OSSL_LIB_CTX *libctx, const char *algorithm,
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const char *properties);
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diff --git a/providers/implementations/macs/hmac_prov.c b/providers/implementations/macs/hmac_prov.c
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index 52ebb08b8f..cf5c3ecbe7 100644
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--- a/providers/implementations/macs/hmac_prov.c
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+++ b/providers/implementations/macs/hmac_prov.c
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@@ -21,6 +21,8 @@
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#include <openssl/evp.h>
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#include <openssl/hmac.h>
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+#include "crypto/evp.h"
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+
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#include "prov/implementations.h"
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#include "prov/provider_ctx.h"
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#include "prov/provider_util.h"
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@@ -244,6 +246,9 @@ static int hmac_final(void *vmacctx, unsigned char *out, size_t *outl,
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static const OSSL_PARAM known_gettable_ctx_params[] = {
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OSSL_PARAM_size_t(OSSL_MAC_PARAM_SIZE, NULL),
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OSSL_PARAM_size_t(OSSL_MAC_PARAM_BLOCK_SIZE, NULL),
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+#ifdef FIPS_MODULE
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+ OSSL_PARAM_int(OSSL_MAC_PARAM_REDHAT_FIPS_INDICATOR, NULL),
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+#endif /* defined(FIPS_MODULE) */
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OSSL_PARAM_END
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};
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static const OSSL_PARAM *hmac_gettable_ctx_params(ossl_unused void *ctx,
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@@ -265,6 +270,18 @@ static int hmac_get_ctx_params(void *vmacctx, OSSL_PARAM params[])
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&& !OSSL_PARAM_set_int(p, hmac_block_size(macctx)))
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return 0;
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+#ifdef FIPS_MODULE
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+ if ((p = OSSL_PARAM_locate(params, OSSL_MAC_PARAM_REDHAT_FIPS_INDICATOR)) != NULL) {
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+ int fips_indicator = EVP_MAC_REDHAT_FIPS_INDICATOR_APPROVED;
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+ /* NIST SP 800-131Ar2, Table 9: Approval Status of MAC Algorithms
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+ * specifies key lengths < 112 bytes are disallowed for HMAC generation
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+ * and legacy use for HMAC verification. */
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+ if (macctx->keylen < EVP_HMAC_GEN_FIPS_MIN_KEY_LEN)
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+ fips_indicator = EVP_MAC_REDHAT_FIPS_INDICATOR_NOT_APPROVED;
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+ return OSSL_PARAM_set_int(p, fips_indicator);
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+ }
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+#endif /* defined(FIPS_MODULE) */
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+
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return 1;
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}
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--
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2.38.1
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