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| /* | ||
| * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved. | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"). | ||
| * You may not use this file except in compliance with the License. | ||
| * A copy of the License is located at | ||
| * | ||
| * http://aws.amazon.com/apache2.0 | ||
| * | ||
| * or in the "license" file accompanying this file. This file is distributed | ||
| * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either | ||
| * express or implied. See the License for the specific language governing | ||
| * permissions and limitations under the License. | ||
| */ | ||
|
|
||
| #include "crypto/s2n_pq.h" | ||
| #include "s2n_test.h" | ||
| #include "testlib/s2n_testlib.h" | ||
| #include "tls/s2n_kem.h" | ||
| #include "tls/s2n_security_policies.h" | ||
| #include "tls/s2n_tls.h" | ||
|
|
||
| static S2N_RESULT s2n_policy_has_cipher(const struct s2n_security_policy *security_policy, const struct s2n_cipher_suite *needle, bool *val) | ||
| { | ||
| RESULT_ENSURE_REF(security_policy); | ||
| RESULT_ENSURE_REF(security_policy->cipher_preferences); | ||
| RESULT_ENSURE_REF(security_policy->cipher_preferences->suites); | ||
|
|
||
| for (size_t i = 0; i < security_policy->cipher_preferences->count; i++) { | ||
| const struct s2n_cipher_suite *hay = security_policy->cipher_preferences->suites[i]; | ||
| if (hay == needle) { | ||
| *val = true; | ||
| return S2N_RESULT_OK; | ||
| } | ||
| } | ||
|
|
||
| *val = false; | ||
| return S2N_RESULT_OK; | ||
| } | ||
|
|
||
| static S2N_RESULT s2n_policy_has_kem(const struct s2n_security_policy *security_policy, const struct s2n_kem **kem_list, size_t kem_list_count, bool *val) | ||
| { | ||
| RESULT_ENSURE_REF(security_policy); | ||
| RESULT_ENSURE_REF(security_policy->kem_preferences); | ||
|
|
||
| if (security_policy->kem_preferences->tls13_kem_groups == NULL || security_policy->kem_preferences->tls13_kem_group_count == 0) { | ||
| *val = false; | ||
| return S2N_RESULT_OK; | ||
| } | ||
|
|
||
| for (size_t i = 0; i < security_policy->kem_preferences->tls13_kem_group_count; i++) { | ||
| const struct s2n_kem_group *supported_kem_group = security_policy->kem_preferences->tls13_kem_groups[i]; | ||
| RESULT_ENSURE_REF(supported_kem_group); | ||
| for (int j = 0; j < kem_list_count; j++) { | ||
| const struct s2n_kem *banned_kem = kem_list[j]; | ||
| RESULT_ENSURE_REF(banned_kem); | ||
| if (supported_kem_group->kem == banned_kem) { | ||
| *val = true; | ||
| return S2N_RESULT_OK; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| *val = false; | ||
| return S2N_RESULT_OK; | ||
| } | ||
|
|
||
| static S2N_RESULT s2n_policy_in_list(const char *policy_name, const char **exception_list, size_t list_count, bool *val) | ||
| { | ||
| RESULT_ENSURE_REF(policy_name); | ||
|
|
||
| for (size_t i = 0; i < list_count; i++) { | ||
| const char *exception = exception_list[i]; | ||
| RESULT_ENSURE_REF(exception); | ||
|
|
||
| if (strlen(policy_name) != strlen(exception)) { | ||
| continue; | ||
| } | ||
|
|
||
| if (memcmp(policy_name, exception, strlen(policy_name)) == 0) { | ||
| *val = true; | ||
| return S2N_RESULT_OK; | ||
| } | ||
| } | ||
|
|
||
| *val = false; | ||
| return S2N_RESULT_OK; | ||
| } | ||
|
|
||
| /* List of all ML-KEM Parameter sizes */ | ||
| const struct s2n_kem *mlkem_list[] = { | ||
| &s2n_mlkem_768 | ||
| }; | ||
|
|
||
| /* Ciphers that should not be present in TLS Policies that have ML-KEM */ | ||
| const struct s2n_cipher_suite *legacy_cipher_suites[] = { | ||
| &s2n_ecdhe_kyber_rsa_with_aes_256_gcm_sha384, /* Draft cipher for negotiating Kyber in TLS 1.2. */ | ||
| &s2n_rsa_with_3des_ede_cbc_sha, | ||
| &s2n_dhe_rsa_with_3des_ede_cbc_sha, | ||
| &s2n_ecdhe_rsa_with_3des_ede_cbc_sha, | ||
| &s2n_ecdhe_rsa_with_rc4_128_sha, | ||
| &s2n_rsa_with_rc4_128_sha, | ||
| &s2n_rsa_with_rc4_128_md5, | ||
| &s2n_null_cipher_suite, | ||
| }; | ||
|
|
||
| /* List of s2n TLS Security Policies that are allowed to have legacy TLS Ciphers and support ML-KEM */ | ||
| const char *cipher_exceptions[] = { | ||
| "test_all", | ||
| }; | ||
|
|
||
| /* List of s2n TLS Security Policies that are allowed to have a minimum TLS Version below TLS 1.2 and support ML-KEM */ | ||
| const char *tls_version_exceptions[] = { | ||
| "test_all", | ||
| }; | ||
|
|
||
| const size_t mlkem_list_size = s2n_array_len(mlkem_list); | ||
| const size_t cipher_exceptions_size = s2n_array_len(cipher_exceptions); | ||
| const size_t tls_version_exceptions_size = s2n_array_len(tls_version_exceptions); | ||
|
|
||
| int main(int argc, char **argv) | ||
| { | ||
| BEGIN_TEST(); | ||
|
|
||
| /* Enforce minimum requirements on all security policies that support ML-KEM */ | ||
| for (size_t policy_index = 0; security_policy_selection[policy_index].version != NULL; policy_index++) { | ||
| const struct s2n_security_policy_selection selection = security_policy_selection[policy_index]; | ||
| const char *policy_name = selection.version; | ||
| const struct s2n_security_policy *security_policy = selection.security_policy; | ||
| POSIX_ENSURE_REF(security_policy); | ||
|
|
||
| bool has_mlkem = false; | ||
| EXPECT_OK(s2n_policy_has_kem(security_policy, mlkem_list, mlkem_list_size, &has_mlkem)); | ||
|
|
||
| if (!has_mlkem) { | ||
| continue; | ||
| } | ||
|
|
||
| /* ML-KEM requires TLS 1.3 in order to be negotiated. Ensure that Policies with ML-KEM also support TLS 1.3 */ | ||
| bool has_tls_13_cipher = false; | ||
| for (size_t i = 0; i < security_policy->cipher_preferences->count; i++) { | ||
| if (security_policy->cipher_preferences->suites[i]->minimum_required_tls_version == S2N_TLS13) { | ||
| has_tls_13_cipher = true; | ||
| break; | ||
| } | ||
| } | ||
| EXPECT_TRUE(has_tls_13_cipher); | ||
|
|
||
| /* Ensure all security policies that have ML-KEM support do not use previous draft wire-format | ||
| * for Hybrid KeyShares with length prefixing. */ | ||
| const struct s2n_kem_preferences *kem_preferences = security_policy->kem_preferences; | ||
| POSIX_ENSURE_REF(kem_preferences); | ||
| EXPECT_FALSE(s2n_tls13_client_must_use_hybrid_kem_length_prefix(kem_preferences)); | ||
|
|
||
| /* All security policies that have ML-KEM should have TLS 1.2 as their minimum supported TLS Version */ | ||
| if (security_policy->minimum_protocol_version < S2N_TLS12) { | ||
| bool has_exception = false; | ||
| EXPECT_OK(s2n_policy_in_list(policy_name, tls_version_exceptions, tls_version_exceptions_size, &has_exception)); | ||
|
|
||
| if (!has_exception) { | ||
| fprintf(stdout, "Security Policy: %s has ML-KEM and uses a legacy TLS Version: %d\n", | ||
| policy_name, security_policy->minimum_protocol_version); | ||
| FAIL_MSG("ML-KEM policies should not contain legacy TLS Versions."); | ||
| } | ||
| } | ||
|
|
||
| /* Policies that have ML-KEM should not have 3DES, RC4, or (abandoned/deprecated) draft TLS 1.2 Kyber support */ | ||
| for (int j = 0; j < s2n_array_len(legacy_cipher_suites); j++) { | ||
| bool has_cipher = false; | ||
| EXPECT_OK(s2n_policy_has_cipher(security_policy, legacy_cipher_suites[j], &has_cipher)); | ||
|
|
||
| if (has_cipher) { | ||
| bool has_exception = false; | ||
| EXPECT_OK(s2n_policy_in_list(policy_name, cipher_exceptions, cipher_exceptions_size, &has_exception)); | ||
|
|
||
| if (!has_exception) { | ||
| fprintf(stdout, "Security Policy: %s has ML-KEM and legacy cipher: %s\n", | ||
| policy_name, legacy_cipher_suites[j]->name); | ||
| FAIL_MSG("ML-KEM policies should not contain legacy ciphers."); | ||
| } | ||
| } | ||
| } | ||
| } | ||
|
|
||
| END_TEST(); | ||
| } |
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