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envelope-from=farman@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org From: Zhuoying Cai Introduce new helper functions to extract certificate metadata: qcrypto_x509_check_cert_times() - validates the certificate's validity period against the current time qcrypto_x509_get_cert_key_id() - extracts the key ID from the certificate qcrypto_x509_check_ecc_curve_p521() - determines the ECC public key algorithm uses P-521 curve These functions provide support for metadata extraction and validity checking for X.509 certificates. Signed-off-by: Zhuoying Cai Acked-by: Daniel P. Berrangé Reviewed-by: Daniel P. Berrangé Reviewed-by: Farhan Ali Link: https://lore.kernel.org/qemu-devel/20260730214624.2328883-9-zycai@linux.ibm.com Signed-off-by: Eric Farman --- crypto/x509-utils.c | 236 ++++++++++++++++++++++++++++++++++++ include/crypto/x509-utils.h | 51 ++++++++ 2 files changed, 287 insertions(+) diff --git a/crypto/x509-utils.c b/crypto/x509-utils.c index 369e7ca6af..543fc3007d 100644 --- a/crypto/x509-utils.c +++ b/crypto/x509-utils.c @@ -27,6 +27,16 @@ static const int qcrypto_to_gnutls_hash_alg_map[QCRYPTO_HASH_ALGO__MAX] = { [QCRYPTO_HASH_ALGO_RIPEMD160] = GNUTLS_DIG_RMD160, }; +static const int qcrypto_to_gnutls_keyid_flags_map[] = { + [QCRYPTO_HASH_ALGO_MD5] = -1, + [QCRYPTO_HASH_ALGO_SHA1] = GNUTLS_KEYID_USE_SHA1, + [QCRYPTO_HASH_ALGO_SHA224] = -1, + [QCRYPTO_HASH_ALGO_SHA256] = GNUTLS_KEYID_USE_SHA256, + [QCRYPTO_HASH_ALGO_SHA384] = -1, + [QCRYPTO_HASH_ALGO_SHA512] = GNUTLS_KEYID_USE_SHA512, + [QCRYPTO_HASH_ALGO_RIPEMD160] = -1, +}; + int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size, QCryptoHashAlgo alg, uint8_t *result, @@ -122,6 +132,210 @@ cleanup: return ret; } +int qcrypto_x509_check_cert_times(uint8_t *cert, size_t size, Error **errp) +{ + int rc; + int ret = -1; + gnutls_x509_crt_t crt; + gnutls_datum_t datum = {.data = cert, .size = size}; + time_t now = time(NULL); + time_t exp_time; + time_t act_time; + + if (now == ((time_t)-1)) { + error_setg_errno(errp, errno, "Cannot get current time"); + return ret; + } + + rc = gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); + return ret; + } + + rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc != 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); + goto cleanup; + } + + exp_time = gnutls_x509_crt_get_expiration_time(crt); + if (exp_time == ((time_t)-1)) { + error_setg(errp, "Failed to get certificate expiration time"); + goto cleanup; + } + if (exp_time < now) { + error_setg(errp, "The certificate has expired"); + goto cleanup; + } + + act_time = gnutls_x509_crt_get_activation_time(crt); + if (act_time == ((time_t)-1)) { + error_setg(errp, "Failed to get certificate activation time"); + goto cleanup; + } + if (act_time > now) { + error_setg(errp, "The certificate is not yet active"); + goto cleanup; + } + + ret = 0; + +cleanup: + gnutls_x509_crt_deinit(crt); + return ret; +} + +static int qcrypto_x509_get_pk_algorithm(uint8_t *cert, size_t size, Error **errp) +{ + int rc; + int ret = -1; + unsigned int bits; + gnutls_x509_crt_t crt; + gnutls_datum_t datum = {.data = cert, .size = size}; + + rc = gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); + return ret; + } + + rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc != 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); + goto cleanup; + } + + rc = gnutls_x509_crt_get_pk_algorithm(crt, &bits); + if (rc < 0) { + error_setg(errp, "Unknown public key algorithm %d", rc); + goto cleanup; + } + + ret = rc; + +cleanup: + gnutls_x509_crt_deinit(crt); + return ret; +} + +int qcrypto_x509_get_cert_key_id(uint8_t *cert, size_t size, + QCryptoHashAlgo hash_alg, + uint8_t **result, + size_t *resultlen, + Error **errp) +{ + int rc; + int ret = -1; + gnutls_x509_crt_t crt; + gnutls_datum_t datum = {.data = cert, .size = size}; + + if (hash_alg >= G_N_ELEMENTS(qcrypto_to_gnutls_hash_alg_map)) { + error_setg(errp, "Unknown hash algorithm %d", hash_alg); + return ret; + } + + if (hash_alg >= G_N_ELEMENTS(qcrypto_to_gnutls_keyid_flags_map) || + qcrypto_to_gnutls_keyid_flags_map[hash_alg] == -1) { + error_setg(errp, "Unsupported key id flag %d", hash_alg); + return ret; + } + + rc = gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); + return ret; + } + + rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc != 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); + goto cleanup; + } + + *resultlen = gnutls_hash_get_len(qcrypto_to_gnutls_hash_alg_map[hash_alg]); + if (*resultlen == 0) { + error_setg(errp, "Failed to get hash algorithm length: %s", gnutls_strerror(rc)); + goto cleanup; + } + + *result = g_malloc0(*resultlen); + if (gnutls_x509_crt_get_key_id(crt, + qcrypto_to_gnutls_keyid_flags_map[hash_alg], + *result, resultlen) != 0) { + error_setg(errp, "Failed to get key ID from certificate"); + g_clear_pointer(result, g_free); + goto cleanup; + } + + ret = 0; + +cleanup: + gnutls_x509_crt_deinit(crt); + return ret; +} + +static int qcrypto_x509_get_ecc_curve(uint8_t *cert, size_t size, Error **errp) +{ + int rc; + int ret = -1; + gnutls_x509_crt_t crt; + gnutls_datum_t datum = {.data = cert, .size = size}; + gnutls_ecc_curve_t curve_id; + gnutls_datum_t x = {.data = NULL, .size = 0}; + gnutls_datum_t y = {.data = NULL, .size = 0}; + + rc = gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_strerror(rc)); + return ret; + } + + rc = gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc != 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerror(rc)); + goto cleanup; + } + + rc = gnutls_x509_crt_get_pk_ecc_raw(crt, &curve_id, &x, &y); + if (rc != 0) { + error_setg(errp, "Failed to get ECC public key curve: %s", gnutls_strerror(rc)); + goto cleanup; + } + + ret = curve_id; + +cleanup: + gnutls_x509_crt_deinit(crt); + g_free(x.data); + g_free(y.data); + return ret; +} + +int qcrypto_x509_check_ecc_curve_p521(uint8_t *cert, size_t size, Error **errp) +{ + int algo; + int curve_id; + + algo = qcrypto_x509_get_pk_algorithm(cert, size, errp); + if (algo != GNUTLS_PK_ECDSA) { + return 0; + } + + curve_id = qcrypto_x509_get_ecc_curve(cert, size, errp); + if (curve_id == -1) { + error_setg(errp, "Failed to get ECC curve"); + return -1; + } + + if (curve_id == GNUTLS_ECC_CURVE_INVALID) { + error_setg(errp, "Invalid ECC curve"); + return -1; + } + + return curve_id == GNUTLS_ECC_CURVE_SECP521R1; +} + #else /* ! CONFIG_GNUTLS */ int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size, @@ -143,4 +357,26 @@ int qcrypto_x509_convert_cert_der(uint8_t *cert, size_t size, return -1; } +int qcrypto_x509_check_cert_times(uint8_t *cert, size_t size, Error **errp) +{ + error_setg(errp, "GNUTLS is required to get certificate times"); + return -1; +} + +int qcrypto_x509_get_cert_key_id(uint8_t *cert, size_t size, + QCryptoHashAlgo hash_alg, + uint8_t **result, + size_t *resultlen, + Error **errp) +{ + error_setg(errp, "GNUTLS is required to get key ID"); + return -1; +} + +int qcrypto_x509_check_ecc_curve_p521(uint8_t *cert, size_t size, Error **errp) +{ + error_setg(errp, "GNUTLS is required to determine ecc curve"); + return -1; +} + #endif /* ! CONFIG_GNUTLS */ diff --git a/include/crypto/x509-utils.h b/include/crypto/x509-utils.h index 91ae79fb03..fcace73c49 100644 --- a/include/crypto/x509-utils.h +++ b/include/crypto/x509-utils.h @@ -40,4 +40,55 @@ int qcrypto_x509_convert_cert_der(uint8_t *cert, size_t size, size_t *resultlen, Error **errp); +/** + * qcrypto_x509_check_cert_times + * @cert: pointer to the raw certificate data + * @size: size of the certificate + * @errp: error pointer + * + * Check whether the activation and expiration times of @cert + * are valid at the current time. + * + * Returns: 0 if the certificate times are valid, + * -1 on error. + */ +int qcrypto_x509_check_cert_times(uint8_t *cert, size_t size, Error **errp); + +/** + * qcrypto_x509_get_cert_key_id + * @cert: pointer to the raw certificate data + * @size: size of the certificate + * @hash_alg: the hash algorithm flag + * @result: output location for the allocated buffer for key ID + * (the function allocates memory which must be freed by the caller) + * @resultlen: pointer to the size of the buffer + * (will be updated with the actual size of key id) + * @errp: error pointer + * + * Retrieve the key ID from the @cert based on the specified @hash_alg. + * + * Returns: 0 if key ID was successfully stored in @result, + * -1 on error. + */ +int qcrypto_x509_get_cert_key_id(uint8_t *cert, size_t size, + QCryptoHashAlgo hash_alg, + uint8_t **result, + size_t *resultlen, + Error **errp); + +/** + * qcrypto_x509_check_ecc_curve_p521 + * @cert: pointer to the raw certificate data + * @size: size of the certificate + * @errp: error pointer + * + * Determine whether the ECC public key in the given certificate uses the P-521 + * curve. + * + * Returns: 0 if ECC public key does not use P521 curve. + * 1 if ECC public key uses P521 curve. + * -1 on error. + */ +int qcrypto_x509_check_ecc_curve_p521(uint8_t *cert, size_t size, Error **errp); + #endif -- 2.55.0