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/* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
* SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
* OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
* CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
#include <openssl/crypto.h>
#include <openssl/ec.h>
#include <openssl/ec_key.h>
#include <openssl/err.h>
#include <openssl/evp.h>
#include <openssl/service_indicator.h>
#include "../../evp/internal.h"
#include "../../internal.h"
#include "internal.h"
#if defined(BORINGSSL_FIPS)
#define STATE_UNLOCKED 0
// fips_service_indicator_state is a thread-local structure that stores the
// state of the FIPS service indicator.
struct fips_service_indicator_state {
// lock_state records the number of times the indicator has been locked.
// When it is zero (i.e. |STATE_UNLOCKED|) then the indicator can be updated.
uint64_t lock_state;
// counter is the indicator state. It is incremented when an approved service
// completes.
uint64_t counter;
};
// service_indicator_get returns a pointer to the |fips_service_indicator_state|
// for the current thread. It returns NULL on error.
//
// FIPS 140-3 requires that the module should provide the service indicator
// for approved services irrespective of whether the user queries it or not.
// Hence, it is lazily initialized in any call to an approved service.
static struct fips_service_indicator_state *service_indicator_get(void) {
struct fips_service_indicator_state *indicator = CRYPTO_get_thread_local(
OPENSSL_THREAD_LOCAL_FIPS_SERVICE_INDICATOR_STATE);
if (indicator == NULL) {
indicator = OPENSSL_malloc(sizeof(struct fips_service_indicator_state));
if (indicator == NULL) {
return NULL;
}
indicator->lock_state = STATE_UNLOCKED;
indicator->counter = 0;
if (!CRYPTO_set_thread_local(
OPENSSL_THREAD_LOCAL_FIPS_SERVICE_INDICATOR_STATE, indicator,
OPENSSL_free)) {
OPENSSL_PUT_ERROR(CRYPTO, ERR_R_INTERNAL_ERROR);
return NULL;
}
}
return indicator;
}
static uint64_t service_indicator_get_counter(void) {
struct fips_service_indicator_state *indicator = service_indicator_get();
if (indicator == NULL) {
return 0;
}
return indicator->counter;
}
uint64_t FIPS_service_indicator_before_call(void) {
return service_indicator_get_counter();
}
uint64_t FIPS_service_indicator_after_call(void) {
return service_indicator_get_counter();
}
void FIPS_service_indicator_update_state(void) {
struct fips_service_indicator_state *indicator = service_indicator_get();
if (indicator && indicator->lock_state == STATE_UNLOCKED) {
indicator->counter++;
}
}
void FIPS_service_indicator_lock_state(void) {
struct fips_service_indicator_state *indicator = service_indicator_get();
if (indicator == NULL) {
return;
}
// |FIPS_service_indicator_lock_state| and
// |FIPS_service_indicator_unlock_state| should not under/overflow in normal
// operation. They are still checked and errors added to facilitate testing in
// service_indicator_test.cc. This should only happen if lock/unlock are
// called in an incorrect order or multiple times in the same function.
const uint64_t new_state = indicator->lock_state + 1;
if (new_state < indicator->lock_state) {
// Overflow. This would imply that our call stack length has exceeded a
// |uint64_t| which impossible on a 64-bit system.
abort();
}
indicator->lock_state = new_state;
}
void FIPS_service_indicator_unlock_state(void) {
struct fips_service_indicator_state *indicator = service_indicator_get();
if (indicator == NULL) {
return;
}
if (indicator->lock_state == 0) {
abort();
}
indicator->lock_state--;
}
void AEAD_GCM_verify_service_indicator(const EVP_AEAD_CTX *ctx) {
const size_t key_len = EVP_AEAD_key_length(ctx->aead);
if (key_len == 16 || key_len == 32) {
FIPS_service_indicator_update_state();
}
}
void AEAD_CCM_verify_service_indicator(const EVP_AEAD_CTX *ctx) {
if (EVP_AEAD_key_length(ctx->aead) == 16 && ctx->tag_len == 4) {
FIPS_service_indicator_update_state();
}
}
// is_ec_fips_approved returns one if the curve corresponding to the given NID
// is FIPS approved, and zero otherwise.
static int is_ec_fips_approved(int curve_nid) {
switch (curve_nid) {
case NID_secp224r1:
case NID_X9_62_prime256v1:
case NID_secp384r1:
case NID_secp521r1:
return 1;
default:
return 0;
}
}
// is_md_fips_approved_for_signing returns one if the given message digest type
// is FIPS approved for signing, and zero otherwise.
static int is_md_fips_approved_for_signing(int md_type) {
switch (md_type) {
case NID_sha224:
case NID_sha256:
case NID_sha384:
case NID_sha512:
case NID_sha512_256:
return 1;
default:
return 0;
}
}
// is_md_fips_approved_for_verifying returns one if the given message digest
// type is FIPS approved for verifying, and zero otherwise.
static int is_md_fips_approved_for_verifying(int md_type) {
switch (md_type) {
case NID_sha1:
case NID_sha224:
case NID_sha256:
case NID_sha384:
case NID_sha512:
case NID_sha512_256:
return 1;
default:
return 0;
}
}
static void evp_md_ctx_verify_service_indicator(const EVP_MD_CTX *ctx,
int rsa_1024_ok,
int (*md_ok)(int md_type)) {
if (EVP_MD_CTX_md(ctx) == NULL) {
// Signature schemes without a prehash are currently never FIPS approved.
goto err;
}
EVP_PKEY_CTX *const pctx = ctx->pctx;
const EVP_PKEY *const pkey = EVP_PKEY_CTX_get0_pkey(pctx);
const int pkey_type = EVP_PKEY_id(pkey);
const int md_type = EVP_MD_CTX_type(ctx);
// EVP_PKEY_RSA_PSS SPKIs aren't supported.
if (pkey_type == EVP_PKEY_RSA) {
// Message digest used in the private key should be of the same type
// as the given one, so we extract the MD type from the |EVP_PKEY|
// and compare it with the type in |ctx|.
const EVP_MD *pctx_md;
if (!EVP_PKEY_CTX_get_signature_md(pctx, &pctx_md)) {
goto err;
}
if (EVP_MD_type(pctx_md) != md_type) {
goto err;
}
int padding;
if (!EVP_PKEY_CTX_get_rsa_padding(pctx, &padding)) {
goto err;
}
if (padding == RSA_PKCS1_PSS_PADDING) {
int salt_len;
const EVP_MD *mgf1_md;
if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pctx, &salt_len) ||
!EVP_PKEY_CTX_get_rsa_mgf1_md(pctx, &mgf1_md) ||
(salt_len != -1 && salt_len != (int)EVP_MD_size(pctx_md)) ||
EVP_MD_type(mgf1_md) != md_type) {
// Only PSS where saltLen == hashLen is tested with ACVP. Cases with
// non-standard padding functions are also excluded.
goto err;
}
}
// The approved RSA key sizes for signing are 2048, 3072 and 4096 bits.
// Note: |EVP_PKEY_size| returns the size in bytes.
size_t pkey_size = EVP_PKEY_size(ctx->pctx->pkey);
// Check if the MD type and the RSA key size are approved.
if (md_ok(md_type) &&
((rsa_1024_ok && pkey_size == 128) || pkey_size == 256 ||
pkey_size == 384 || pkey_size == 512)) {
FIPS_service_indicator_update_state();
}
} else if (pkey_type == EVP_PKEY_EC) {
// Check if the MD type and the elliptic curve are approved.
if (md_ok(md_type) &&
is_ec_fips_approved(EC_GROUP_get_curve_name(
EC_KEY_get0_group(EVP_PKEY_get0_EC_KEY(ctx->pctx->pkey))))) {
FIPS_service_indicator_update_state();
}
}
err:
// Ensure that junk errors aren't left on the queue.
ERR_clear_error();
}
void EC_KEY_keygen_verify_service_indicator(const EC_KEY *eckey) {
if (is_ec_fips_approved(EC_GROUP_get_curve_name(eckey->group))) {
FIPS_service_indicator_update_state();
}
}
void ECDH_verify_service_indicator(const EC_KEY *ec_key) {
if (is_ec_fips_approved(EC_GROUP_get_curve_name(EC_KEY_get0_group(ec_key)))) {
FIPS_service_indicator_update_state();
}
}
void EVP_Cipher_verify_service_indicator(const EVP_CIPHER_CTX *ctx) {
switch (EVP_CIPHER_CTX_nid(ctx)) {
case NID_aes_128_ecb:
case NID_aes_192_ecb:
case NID_aes_256_ecb:
case NID_aes_128_cbc:
case NID_aes_192_cbc:
case NID_aes_256_cbc:
case NID_aes_128_ctr:
case NID_aes_192_ctr:
case NID_aes_256_ctr:
FIPS_service_indicator_update_state();
}
}
void EVP_DigestVerify_verify_service_indicator(const EVP_MD_CTX *ctx) {
return evp_md_ctx_verify_service_indicator(ctx, /*rsa_1024_ok=*/1,
is_md_fips_approved_for_verifying);
}
void EVP_DigestSign_verify_service_indicator(const EVP_MD_CTX *ctx) {
return evp_md_ctx_verify_service_indicator(ctx, /*rsa_1024_ok=*/0,
is_md_fips_approved_for_signing);
}
void HMAC_verify_service_indicator(const EVP_MD *evp_md) {
switch (evp_md->type) {
case NID_sha1:
case NID_sha224:
case NID_sha256:
case NID_sha384:
case NID_sha512:
case NID_sha512_256:
FIPS_service_indicator_update_state();
break;
}
}
void TLSKDF_verify_service_indicator(const EVP_MD *md) {
// HMAC-MD5/HMAC-SHA1 (both used concurrently) is approved for use in the KDF
// in TLS 1.0/1.1. HMAC-SHA{256, 384, 512} are approved for use in the KDF in
// TLS 1.2. These Key Derivation functions are to be used in the context of
// the TLS protocol.
switch (EVP_MD_type(md)) {
case NID_md5_sha1:
case NID_sha256:
case NID_sha384:
case NID_sha512:
FIPS_service_indicator_update_state();
break;
}
}
#else
uint64_t FIPS_service_indicator_before_call(void) { return 0; }
uint64_t FIPS_service_indicator_after_call(void) {
// One is returned so that the return value is always greater than zero, the
// return value of |FIPS_service_indicator_before_call|. This makes everything
// report as "approved" in non-FIPS builds.
return 1;
}
#endif // BORINGSSL_FIPS