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106 lines
5.1 KiB
106 lines
5.1 KiB
From 589eb3898896c1ac916bc20069ecd5adb8534850 Mon Sep 17 00:00:00 2001
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From: Clemens Lang <cllang@redhat.com>
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Date: Fri, 17 Feb 2023 15:31:08 +0100
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Subject: [PATCH] GCM: Implement explicit FIPS indicator for IV gen
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Implementation Guidance for FIPS 140-3 and the Cryptographic Module
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Verification Program, Section C.H requires guarantees about the
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uniqueness of key/iv pairs, and proposes a few approaches to ensure
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this. Provide an indicator for option 2 "The IV may be generated
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internally at its entirety randomly."
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Resolves: rhbz#2168289
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Signed-off-by: Clemens Lang <cllang@redhat.com>
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---
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include/openssl/evp.h | 4 +++
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.../implementations/ciphers/ciphercommon.c | 4 +++
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.../ciphers/ciphercommon_gcm.c | 25 +++++++++++++++++++
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util/perl/OpenSSL/paramnames.pm | 5 ++--
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4 files changed, 36 insertions(+), 2 deletions(-)
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diff --git a/include/openssl/evp.h b/include/openssl/evp.h
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index 49e8e1df78..ec2ba46fbd 100644
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--- a/include/openssl/evp.h
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+++ b/include/openssl/evp.h
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@@ -746,6 +746,10 @@ void EVP_CIPHER_CTX_set_flags(EVP_CIPHER_CTX *ctx, int flags);
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void EVP_CIPHER_CTX_clear_flags(EVP_CIPHER_CTX *ctx, int flags);
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int EVP_CIPHER_CTX_test_flags(const EVP_CIPHER_CTX *ctx, int flags);
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+# define EVP_CIPHER_REDHAT_FIPS_INDICATOR_UNDETERMINED 0
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+# define EVP_CIPHER_REDHAT_FIPS_INDICATOR_APPROVED 1
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+# define EVP_CIPHER_REDHAT_FIPS_INDICATOR_NOT_APPROVED 2
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+
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__owur int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher,
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const unsigned char *key, const unsigned char *iv);
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__owur int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx,
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diff --git a/providers/implementations/ciphers/ciphercommon.c b/providers/implementations/ciphers/ciphercommon.c
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index fa383165d8..716add7339 100644
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--- a/providers/implementations/ciphers/ciphercommon.c
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+++ b/providers/implementations/ciphers/ciphercommon.c
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@@ -149,6 +149,10 @@ static const OSSL_PARAM cipher_aead_known_gettable_ctx_params[] = {
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OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TAG, NULL, 0),
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OSSL_PARAM_size_t(OSSL_CIPHER_PARAM_AEAD_TLS1_AAD_PAD, NULL),
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OSSL_PARAM_octet_string(OSSL_CIPHER_PARAM_AEAD_TLS1_GET_IV_GEN, NULL, 0),
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+ /* normally we would hide this under an #ifdef FIPS_MODULE, but that does
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+ * not work in ciphercommon.c because it is compiled only once into
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+ * libcommon.a */
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+ OSSL_PARAM_int(OSSL_CIPHER_PARAM_REDHAT_FIPS_INDICATOR, NULL),
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OSSL_PARAM_END
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};
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const OSSL_PARAM *ossl_cipher_aead_gettable_ctx_params(
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diff --git a/providers/implementations/ciphers/ciphercommon_gcm.c b/providers/implementations/ciphers/ciphercommon_gcm.c
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index ed95c97ff4..db7910eb0e 100644
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--- a/providers/implementations/ciphers/ciphercommon_gcm.c
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+++ b/providers/implementations/ciphers/ciphercommon_gcm.c
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@@ -238,6 +238,31 @@ int ossl_gcm_get_ctx_params(void *vctx, OSSL_PARAM params[])
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break;
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}
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}
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+
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+ /* We would usually hide this under #ifdef FIPS_MODULE, but
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+ * ciphercommon_gcm.c is only compiled once into libcommon.a, so ifdefs do
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+ * not work here. */
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+ p = OSSL_PARAM_locate(params, OSSL_CIPHER_PARAM_REDHAT_FIPS_INDICATOR);
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+ if (p != NULL) {
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+ int fips_indicator = EVP_CIPHER_REDHAT_FIPS_INDICATOR_APPROVED;
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+
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+ /* Implementation Guidance for FIPS 140-3 and the Cryptographic Module
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+ * Verification Program, Section C.H requires guarantees about the
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+ * uniqueness of key/iv pairs, and proposes a few approaches to ensure
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+ * this. This provides an indicator for option 2 "The IV may be
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+ * generated internally at its entirety randomly." Note that one of the
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+ * conditions of this option is that "The IV length shall be at least
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+ * 96 bits (per SP 800-38D)." We do not specically check for this
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+ * condition here, because gcm_iv_generate will fail in this case. */
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+ if (ctx->enc && !ctx->iv_gen_rand)
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+ fips_indicator = EVP_CIPHER_REDHAT_FIPS_INDICATOR_NOT_APPROVED;
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+
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+ if (!OSSL_PARAM_set_int(p, fips_indicator)) {
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+ ERR_raise(ERR_LIB_PROV, PROV_R_FAILED_TO_SET_PARAMETER);
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+ return 0;
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+ }
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+ }
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+
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return 1;
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}
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diff --git a/util/perl/OpenSSL/paramnames.pm b/util/perl/OpenSSL/paramnames.pm
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index a109e44521..64e9809387 100644
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--- a/util/perl/OpenSSL/paramnames.pm
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+++ b/util/perl/OpenSSL/paramnames.pm
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@@ -101,8 +101,9 @@ my %params = (
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'CIPHER_PARAM_SPEED' => "speed", # uint
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'CIPHER_PARAM_CTS_MODE' => "cts_mode", # utf8_string
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# For passing the AlgorithmIdentifier parameter in DER form
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- 'CIPHER_PARAM_ALGORITHM_ID_PARAMS' => "alg_id_param",# octet_string
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- 'CIPHER_PARAM_XTS_STANDARD' => "xts_standard",# utf8_string
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+ 'CIPHER_PARAM_ALGORITHM_ID_PARAMS' => "alg_id_param",# octet_string
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+ 'CIPHER_PARAM_REDHAT_FIPS_INDICATOR' => "redhat-fips-indicator", # int
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+ 'CIPHER_PARAM_XTS_STANDARD' => "xts_standard",# utf8_string
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'CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_SEND_FRAGMENT' => "tls1multi_maxsndfrag",# uint
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'CIPHER_PARAM_TLS1_MULTIBLOCK_MAX_BUFSIZE' => "tls1multi_maxbufsz", # size_t
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--
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2.39.1
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