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charset="utf-8" Introduce new helper functions to extract certificate metadata: qcrypto_x509_check_cert_times() - validates the certificate's validity peri= od against the current time qcrypto_x509_get_pk_algorithm() - returns the public key algorithm used in = the certificate qcrypto_x509_get_cert_key_id() - extracts the key ID from the certificate qcrypto_x509_check_ecc_curve_p521() - determines the ECC public key algorit= hm uses P-521 curve These functions provide support for metadata extraction and validity checki= ng for X.509 certificates. Signed-off-by: Zhuoying Cai Reviewed-by: Farhan Ali --- 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 2696d48155..906d5e5e87 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] =3D { [QCRYPTO_HASH_ALGO_RIPEMD160] =3D GNUTLS_DIG_RMD160, }; =20 +static const int qcrypto_to_gnutls_keyid_flags_map[] =3D { + [QCRYPTO_HASH_ALGO_MD5] =3D -1, + [QCRYPTO_HASH_ALGO_SHA1] =3D GNUTLS_KEYID_USE_SHA1, + [QCRYPTO_HASH_ALGO_SHA224] =3D -1, + [QCRYPTO_HASH_ALGO_SHA256] =3D GNUTLS_KEYID_USE_SHA256, + [QCRYPTO_HASH_ALGO_SHA384] =3D -1, + [QCRYPTO_HASH_ALGO_SHA512] =3D GNUTLS_KEYID_USE_SHA512, + [QCRYPTO_HASH_ALGO_RIPEMD160] =3D -1, +}; + int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size, QCryptoHashAlgo alg, uint8_t *result, @@ -121,6 +131,210 @@ cleanup: return ret; } =20 +int qcrypto_x509_check_cert_times(uint8_t *cert, size_t size, Error **errp) +{ + int rc; + int ret =3D -1; + gnutls_x509_crt_t crt; + gnutls_datum_t datum =3D {.data =3D cert, .size =3D size}; + time_t now =3D time(NULL); + time_t exp_time; + time_t act_time; + + if (now =3D=3D ((time_t)-1)) { + error_setg_errno(errp, errno, "Cannot get current time"); + return ret; + } + + rc =3D gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_st= rerror(rc)); + return ret; + } + + rc =3D gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc !=3D 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerr= or(rc)); + goto cleanup; + } + + exp_time =3D gnutls_x509_crt_get_expiration_time(crt); + if (exp_time =3D=3D ((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 =3D gnutls_x509_crt_get_activation_time(crt); + if (act_time =3D=3D ((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 =3D 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 =3D -1; + unsigned int bits; + gnutls_x509_crt_t crt; + gnutls_datum_t datum =3D {.data =3D cert, .size =3D size}; + + rc =3D gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_st= rerror(rc)); + return ret; + } + + rc =3D gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc !=3D 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerr= or(rc)); + goto cleanup; + } + + rc =3D gnutls_x509_crt_get_pk_algorithm(crt, &bits); + if (rc < 0) { + error_setg(errp, "Unknown public key algorithm %d", rc); + goto cleanup; + } + + ret =3D 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 =3D -1; + gnutls_x509_crt_t crt; + gnutls_datum_t datum =3D {.data =3D cert, .size =3D size}; + + if (hash_alg >=3D G_N_ELEMENTS(qcrypto_to_gnutls_hash_alg_map)) { + error_setg(errp, "Unknown hash algorithm %d", hash_alg); + return ret; + } + + if (hash_alg >=3D G_N_ELEMENTS(qcrypto_to_gnutls_keyid_flags_map) || + qcrypto_to_gnutls_keyid_flags_map[hash_alg] =3D=3D -1) { + error_setg(errp, "Unsupported key id flag %d", hash_alg); + return ret; + } + + rc =3D gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_st= rerror(rc)); + return ret; + } + + rc =3D gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc !=3D 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerr= or(rc)); + goto cleanup; + } + + *resultlen =3D gnutls_hash_get_len(qcrypto_to_gnutls_hash_alg_map[hash= _alg]); + if (*resultlen =3D=3D 0) { + error_setg(errp, "Failed to get hash algorithn length: %s", gnutls= _strerror(rc)); + goto cleanup; + } + + *result =3D g_malloc0(*resultlen); + if (gnutls_x509_crt_get_key_id(crt, + qcrypto_to_gnutls_keyid_flags_map[hash_= alg], + *result, resultlen) !=3D 0) { + error_setg(errp, "Failed to get key ID from certificate"); + g_clear_pointer(result, g_free); + goto cleanup; + } + + ret =3D 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 =3D -1; + gnutls_x509_crt_t crt; + gnutls_datum_t datum =3D {.data =3D cert, .size =3D size}; + gnutls_ecc_curve_t curve_id; + gnutls_datum_t x =3D {.data =3D NULL, .size =3D 0}; + gnutls_datum_t y =3D {.data =3D NULL, .size =3D 0}; + + rc =3D gnutls_x509_crt_init(&crt); + if (rc < 0) { + error_setg(errp, "Failed to initialize certificate: %s", gnutls_st= rerror(rc)); + return ret; + } + + rc =3D gnutls_x509_crt_import(crt, &datum, GNUTLS_X509_FMT_PEM); + if (rc !=3D 0) { + error_setg(errp, "Failed to import certificate: %s", gnutls_strerr= or(rc)); + goto cleanup; + } + + rc =3D gnutls_x509_crt_get_pk_ecc_raw(crt, &curve_id, &x, &y); + if (rc !=3D 0) { + error_setg(errp, "Failed to get ECC public key curve: %s", gnutls_= strerror(rc)); + goto cleanup; + } + + ret =3D curve_id; + +cleanup: + gnutls_x509_crt_deinit(crt); + gnutls_free(x.data); + gnutls_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 =3D qcrypto_x509_get_pk_algorithm(cert, size, errp); + if (algo !=3D GNUTLS_PK_ECDSA) { + return 0; + } + + curve_id =3D qcrypto_x509_get_ecc_curve(cert, size, errp); + if (curve_id =3D=3D -1) { + error_setg(errp, "Failed to get ECC curve"); + return -1; + } + + if (curve_id =3D=3D GNUTLS_ECC_CURVE_INVALID) { + error_setg(errp, "Invalid ECC curve"); + return -1; + } + + return curve_id =3D=3D GNUTLS_ECC_CURVE_SECP521R1; +} + #else /* ! CONFIG_GNUTLS */ =20 int qcrypto_get_x509_cert_fingerprint(uint8_t *cert, size_t size, @@ -142,4 +356,26 @@ int qcrypto_x509_convert_cert_der(uint8_t *cert, size_= t size, return -1; } =20 +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..6040894a46 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); =20 +/** + * 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 call= er) + * @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 @flag. + * + * 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 --=20 2.52.0