mirror of
https://github.com/guanzhi/GmSSL.git
synced 2026-06-29 01:03:38 +08:00
2195 lines
48 KiB
C
2195 lines
48 KiB
C
/*
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* Copyright 2014-2026 The GmSSL Project. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the License); you may
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* not use this file except in compliance with the License.
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#include <gmssl/asn1.h>
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#include <gmssl/endian.h>
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#include <gmssl/oid.h>
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#include <gmssl/x509_ext.h>
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#include <gmssl/x509_cer.h>
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#include <gmssl/error.h>
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static int x509_cert_get_authority_key_identifier(const uint8_t *cert, size_t certlen,
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const uint8_t **keyid, size_t *keyid_len,
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const uint8_t **issuer, size_t *issuer_len,
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const uint8_t **serial, size_t *serial_len)
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{
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int ret;
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int critical;
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const uint8_t *exts;
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size_t extslen;
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const uint8_t *val;
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size_t vlen;
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if (!cert || !certlen || !keyid || !keyid_len
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|| !issuer || !issuer_len || !serial || !serial_len) {
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error_print();
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return -1;
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}
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*keyid = NULL;
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*keyid_len = 0;
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*issuer = NULL;
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*issuer_len = 0;
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*serial = NULL;
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*serial_len = 0;
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if ((ret = x509_cert_get_exts(cert, certlen, &exts, &extslen)) != 1) {
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if (ret) error_print();
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return ret;
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}
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if ((ret = x509_exts_get_ext_by_oid(exts, extslen, OID_ce_authority_key_identifier,
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&critical, &val, &vlen)) != 1) {
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if (ret) error_print();
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return ret;
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}
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if (x509_authority_key_identifier_from_der(keyid, keyid_len,
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issuer, issuer_len, serial, serial_len, &val, &vlen) != 1
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|| asn1_length_is_zero(vlen) != 1) {
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error_print();
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return -1;
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}
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return 1;
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}
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static int x509_cert_get_subject_key_identifier(const uint8_t *cert, size_t certlen,
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const uint8_t **keyid, size_t *keyid_len)
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{
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int ret;
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int critical;
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const uint8_t *exts;
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size_t extslen;
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const uint8_t *val;
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size_t vlen;
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if (!cert || !certlen || !keyid || !keyid_len) {
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error_print();
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return -1;
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}
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*keyid = NULL;
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*keyid_len = 0;
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if ((ret = x509_cert_get_exts(cert, certlen, &exts, &extslen)) != 1) {
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if (ret) error_print();
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return ret;
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}
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if ((ret = x509_exts_get_ext_by_oid(exts, extslen, OID_ce_subject_key_identifier,
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&critical, &val, &vlen)) != 1) {
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if (ret) error_print();
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return ret;
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}
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if (asn1_octet_string_from_der(keyid, keyid_len, &val, &vlen) != 1
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|| asn1_length_is_zero(vlen) != 1) {
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error_print();
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return -1;
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}
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return 1;
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}
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static int x509_signed_is_verified_by_key(const uint8_t *a, size_t alen,
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const X509_KEY *key, const char *signer_id, size_t signer_id_len)
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{
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const uint8_t *tbs;
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size_t tbslen;
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int sig_alg;
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const uint8_t *sig;
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size_t siglen;
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int key_sig_alg;
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void *sign_args = NULL;
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size_t sign_argslen = 0;
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X509_SIGN_CTX verify_ctx;
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if (!a || !alen || !key) {
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error_print();
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return -1;
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}
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if (x509_signed_from_der(&tbs, &tbslen, &sig_alg, &sig, &siglen, &a, &alen) != 1
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|| asn1_length_is_zero(alen) != 1) {
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error_print();
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return -1;
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}
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// FIXME: 改为 x509_key_support_algor
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if (x509_key_get_sign_algor(key, &key_sig_alg) != 1) {
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error_print();
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return -1;
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}
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if (sig_alg != key_sig_alg) {
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return 0;
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}
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// X509_sign/verify 还是默认就使用SM2的默认ID吧
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if (key->algor == OID_ec_public_key && key->algor_param == OID_sm2) {
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sign_args = (uint8_t *)signer_id;
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sign_argslen = signer_id_len;
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}
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if (x509_verify_init(&verify_ctx, key, sign_args, sign_argslen, sig, siglen) != 1
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|| x509_verify_update(&verify_ctx, tbs, tbslen) != 1
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|| x509_verify_finish(&verify_ctx) != 1) {
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return 0;
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}
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return 1;
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}
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// 其实只要把验证签名的步骤拿出来，就可以重用已有的函数
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int x509_cert_is_signed_by_root_ca_cert(const uint8_t *cert, size_t certlen,
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const uint8_t *rootcacert, size_t rootcacertlen,
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const char *signer_id, size_t signer_id_len)
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{
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const uint8_t *issuer;
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size_t issuer_len;
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const uint8_t *subject;
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size_t subject_len;
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const uint8_t *aki;
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size_t aki_len;
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const uint8_t *aki_issuer;
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size_t aki_issuer_len;
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const uint8_t *aki_serial;
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size_t aki_serial_len;
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const uint8_t *ski;
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size_t ski_len;
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const uint8_t *root_serial;
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size_t root_serial_len;
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const uint8_t *directory_name;
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size_t directory_name_len;
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int issuer_match;
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X509_KEY public_key;
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int ret;
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if (!cert || !certlen || !rootcacert || !rootcacertlen) {
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error_print();
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return -1;
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}
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// check issuer == subject
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if (x509_cert_get_issuer(cert, certlen, &issuer, &issuer_len) != 1
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|| x509_cert_get_subject(rootcacert, rootcacertlen, &subject, &subject_len) != 1) {
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error_print();
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return -1;
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}
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if ((ret = x509_name_equ(issuer, issuer_len, subject, subject_len)) != 1) {
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if (ret) error_print();
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return ret;
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}
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// if AKI not exist
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if ((ret = x509_cert_get_authority_key_identifier(cert, certlen,
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&aki, &aki_len, &aki_issuer, &aki_issuer_len, &aki_serial, &aki_serial_len)) < 0) {
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error_print();
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return -1;
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} else if (ret) {
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// AKI exist
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// SKI not exist => not_match
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if ((ret = x509_cert_get_subject_key_identifier(rootcacert, rootcacertlen, &ski, &ski_len)) < 0) {
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if (ret) error_print();
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return ret;
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}
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if (aki_len) {
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if (aki_len != ski_len || memcmp(aki, ski, ski_len) != 0) {
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return 0;
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}
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}
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if (aki_issuer_len || aki_serial_len) {
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if (!aki_issuer_len || !aki_serial_len) {
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error_print();
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return -1;
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}
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if (x509_cert_get_issuer_and_serial_number(rootcacert, rootcacertlen,
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NULL, NULL, &root_serial, &root_serial_len) != 1) {
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error_print();
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return -1;
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}
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// aki_issuer AKI 中的Issuer 是一个GeneralNames.directoryName == ROOTCACERT.subject
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if ((ret = x509_general_names_get_first(aki_issuer, aki_issuer_len, NULL,
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X509_gn_directory_name, &directory_name, &directory_name_len)) < 0) {
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if (ret) error_print();
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return ret;
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}
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if (ret == 0) {
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return 0;
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}
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if ((issuer_match = x509_name_equ(directory_name, directory_name_len,
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subject, subject_len)) != 1) {
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if (issuer_match) error_print();
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return issuer_match;
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}
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if (aki_serial_len != root_serial_len
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|| memcmp(aki_serial, root_serial, root_serial_len) != 0) {
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return 0;
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}
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}
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}
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if (x509_cert_get_subject_public_key(rootcacert, rootcacertlen, &public_key) != 1) {
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error_print();
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return -1;
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}
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// 最后才是verify
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// 可以修改一下 x509_signed_verify_ex ，验证失败不都显式打印错误。
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if ((ret = x509_signed_is_verified_by_key(cert, certlen, &public_key, signer_id, signer_id_len)) < 0) {
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error_print();
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return -1;
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}
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return ret;
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}
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static int x509_general_name_check(int choice, const uint8_t *d, size_t dlen)
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{
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const uint8_t *p;
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size_t len;
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const uint8_t *q;
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size_t qlen;
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uint32_t nodes[32];
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size_t nodes_cnt;
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int tag;
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int ret;
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if (!d || !dlen) {
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error_print();
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return -1;
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}
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switch (choice) {
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case X509_gn_other_name:
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if (asn1_sequence_from_der(&p, &len, &d, &dlen) != 1
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|| asn1_length_is_zero(dlen) != 1
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|| asn1_object_identifier_from_der(nodes, &nodes_cnt, &p, &len) != 1
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|| asn1_explicit_from_der(0, &q, &qlen, &p, &len) != 1
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|| asn1_length_is_zero(len) != 1) {
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error_print();
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return -1;
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}
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if (!qlen) {
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error_print();
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return -1;
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}
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break;
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case X509_gn_rfc822_name:
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case X509_gn_dns_name:
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case X509_gn_uniform_resource_identifier:
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if (asn1_string_is_ia5_string((const char *)d, dlen) != 1) {
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error_print();
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return -1;
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}
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break;
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case X509_gn_x400_address:
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if (asn1_sequence_from_der(&p, &len, &d, &dlen) != 1
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|| asn1_length_is_zero(dlen) != 1
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|| !len) {
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error_print();
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return -1;
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}
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break;
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case X509_gn_directory_name:
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if (asn1_sequence_from_der(&p, &len, &d, &dlen) != 1
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|| asn1_length_is_zero(dlen) != 1
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|| x509_name_check(p, len) != 1) {
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error_print();
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return -1;
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}
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break;
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case X509_gn_edi_party_name:
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if (asn1_sequence_from_der(&p, &len, &d, &dlen) != 1
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|| asn1_length_is_zero(dlen) != 1) {
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error_print();
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return -1;
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}
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if ((ret = x509_explicit_directory_name_from_der(0, &tag, &q, &qlen, &p, &len)) < 0) {
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error_print();
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return -1;
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}
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if (ret && x509_directory_name_check(tag, q, qlen) != 1) {
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error_print();
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return -1;
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}
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if (x509_explicit_directory_name_from_der(1, &tag, &q, &qlen, &p, &len) != 1
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|| x509_directory_name_check(tag, q, qlen) != 1
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|| asn1_length_is_zero(len) != 1) {
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error_print();
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return -1;
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}
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break;
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case X509_gn_ip_address:
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if (dlen != 4 && dlen != 16) {
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error_print();
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return -1;
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}
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break;
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case X509_gn_registered_id:
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if (asn1_object_identifier_from_octets(nodes, &nodes_cnt, d, dlen) != 1) {
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error_print();
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return -1;
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}
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break;
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default:
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error_print();
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return -1;
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}
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return 1;
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}
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static int x509_general_names_check(const uint8_t *d, size_t dlen)
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{
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int choice;
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const uint8_t *name;
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size_t namelen;
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if (!d || !dlen) {
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error_print();
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return -1;
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}
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while (dlen) {
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if (x509_general_name_from_der(&choice, &name, &namelen, &d, &dlen) != 1
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|| x509_general_name_check(choice, name, namelen) != 1) {
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error_print();
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return -1;
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}
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}
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return 1;
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}
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int x509_cert_check_subject(const uint8_t *cert, size_t certlen, int cert_type)
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{
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int has_subject;
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const uint8_t *subject;
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size_t subject_len;
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if (!cert || !certlen) {
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error_print();
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return -1;
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}
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if (x509_cert_get_subject(cert, certlen, &subject, &subject_len) != 1) {
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error_print();
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return -1;
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}
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if ((has_subject = x509_name_check(subject, subject_len)) < 0) {
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error_print();
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return -1;
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}
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if (!has_subject) {
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int is_cacert;
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const uint8_t *exts;
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size_t extslen;
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int critical;
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const uint8_t *val;
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size_t vlen;
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const uint8_t *gns;
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size_t gnslen;
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switch (cert_type) {
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case X509_cert_server_auth:
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case X509_cert_client_auth:
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case X509_cert_server_key_encipher:
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case X509_cert_client_key_encipher:
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is_cacert = 0;
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break;
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case X509_cert_ca:
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case X509_cert_root_ca:
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case X509_cert_crl_sign:
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is_cacert = 1;
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break;
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default:
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error_print();
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return -1;
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}
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if (is_cacert) {
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error_print();
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return -1;
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}
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if (x509_cert_get_exts(cert, certlen, &exts, &extslen) != 1
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|| x509_exts_get_ext_by_oid(exts, extslen, OID_ce_subject_alt_name, &critical, &val, &vlen) != 1) {
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error_print();
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return -1;
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}
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if (critical != X509_critical) {
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error_print();
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return -1;
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}
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if (asn1_sequence_from_der(&gns, &gnslen, &val, &vlen) != 1
|
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|| asn1_length_is_zero(vlen) != 1
|
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|| x509_general_names_check(gns, gnslen) != 1) {
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error_print();
|
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return -1;
|
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}
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}
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return 1;
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}
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static int x509_name_string_char_from_bytes(int tag, uint32_t *ch, const uint8_t **in, size_t *inlen)
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{
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int ret;
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if (!in || !*in || !inlen || !ch) {
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error_print();
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return -1;
|
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}
|
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if (*inlen == 0) {
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return 0;
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}
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|
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switch (tag) {
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case ASN1_TAG_TeletexString:
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*ch = *(*in)++;
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(*inlen)--;
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ret = 1;
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break;
|
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case ASN1_TAG_PrintableString:
|
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if ((ret = asn1_printable_string_code_point_from_bytes(ch, in, inlen)) < 0) {
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error_print();
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return -1;
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}
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break;
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case ASN1_TAG_IA5String:
|
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if ((ret = asn1_ia5_string_code_point_from_bytes(ch, in, inlen)) < 0) {
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error_print();
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return -1;
|
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}
|
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break;
|
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case ASN1_TAG_UTF8String:
|
||
if ((ret = asn1_utf8_string_code_point_from_bytes(ch, in, inlen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
break;
|
||
case ASN1_TAG_BMPString:
|
||
if ((ret = asn1_bmp_string_code_point_from_bytes(ch, in, inlen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
break;
|
||
case ASN1_TAG_UniversalString:
|
||
if ((ret = asn1_universal_string_code_point_from_bytes(ch, in, inlen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
break;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
return ret;
|
||
}
|
||
|
||
static int x509_name_string_skip_spaces(int tag, const uint8_t **in, size_t *inlen)
|
||
{
|
||
int ret;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
uint32_t ch;
|
||
|
||
if (!in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (*inlen) {
|
||
p = *in;
|
||
len = *inlen;
|
||
if ((ret = x509_name_string_char_from_bytes(tag, &ch, &p, &len)) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ch != ' ') {
|
||
return 1;
|
||
}
|
||
*in = p;
|
||
*inlen = len;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_name_string_code_point_from_bytes(int tag, uint32_t *code_point,
|
||
const uint8_t **in, size_t *inlen)
|
||
{
|
||
int ret;
|
||
uint32_t ch;
|
||
|
||
if (!code_point || !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_name_string_char_from_bytes(tag, &ch, in, inlen)) != 1) {
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ('A' <= ch && ch <= 'Z') {
|
||
ch += 'a' - 'A';
|
||
}
|
||
if (ch == ' ') {
|
||
if (x509_name_string_skip_spaces(tag, in, inlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*inlen == 0) {
|
||
return 0;
|
||
}
|
||
ch = ' ';
|
||
}
|
||
*code_point = ch;
|
||
return 1;
|
||
}
|
||
|
||
static int x509_name_string_normalized_equ(int a_tag, const uint8_t *a, size_t alen,
|
||
int b_tag, const uint8_t *b, size_t blen)
|
||
{
|
||
int a_ret;
|
||
int b_ret;
|
||
uint32_t a_ch;
|
||
uint32_t b_ch;
|
||
|
||
if ((!a && alen) || (!b && blen)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (alen && x509_name_string_skip_spaces(a_tag, &a, &alen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (blen && x509_name_string_skip_spaces(b_tag, &b, &blen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
for (;;) {
|
||
a_ret = x509_name_string_code_point_from_bytes(a_tag, &a_ch, &a, &alen);
|
||
if (a_ret < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
b_ret = x509_name_string_code_point_from_bytes(b_tag, &b_ch, &b, &blen);
|
||
if (b_ret < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (a_ret == 0 || b_ret == 0) {
|
||
return a_ret == b_ret ? 1 : 0;
|
||
}
|
||
if (a_ch != b_ch) {
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
|
||
/*
|
||
* 这个 _ex 版本和 x509_attr_type_and_value_from_der() 的区别是：
|
||
* 1. 保留 type 的原始 OBJECT IDENTIFIER DER 编码，因此未知 OID 也可以参与比较；
|
||
* 2. 保留 value 的完整 DER 编码，因此未知或非字符串类型的 value 可以退化为严格 DER 比较；
|
||
* 3. 不调用 x509_attr_type_and_value_check()，避免证书验证时因为本库暂未内置的
|
||
* AttributeTypeAndValue 类型而提前失败。
|
||
*
|
||
* TODO: 以后可以让 x509_attr_type_and_value_from_der() 基于这个 _ex 版本实现，
|
||
* 在通用解析结果之上再做已知 OID 映射和属性值检查。
|
||
*/
|
||
static int x509_attr_type_and_value_from_der_ex(const uint8_t **oid, size_t *oid_len,
|
||
int *val_tag, const uint8_t **val, size_t *val_len,
|
||
const uint8_t **val_der, size_t *val_der_len,
|
||
const uint8_t **in, size_t *inlen)
|
||
{
|
||
int ret = -1;
|
||
const uint8_t *d;
|
||
size_t dlen;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
const uint8_t *oid_val;
|
||
size_t oid_val_len;
|
||
|
||
if (!oid || !oid_len || !val_tag || !val || !val_len || !val_der || !val_der_len
|
||
|| !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (asn1_sequence_from_der(&d, &dlen, in, inlen) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
if (asn1_any_from_der(oid, oid_len, &d, &dlen) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
p = *oid;
|
||
len = *oid_len;
|
||
if (asn1_type_from_der(ASN1_TAG_OBJECT_IDENTIFIER, &oid_val, &oid_val_len, &p, &len) != 1
|
||
|| asn1_length_is_zero(len) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
*val_der = d;
|
||
*val_der_len = dlen;
|
||
if (asn1_any_type_from_der(val_tag, val, val_len, &d, &dlen) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
*val_der_len -= dlen;
|
||
if (asn1_length_is_zero(dlen) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
ret = 1;
|
||
end:
|
||
return ret;
|
||
}
|
||
|
||
static int x509_attr_type_and_value_normalized_equ(const uint8_t *a, size_t alen,
|
||
const uint8_t *b, size_t blen)
|
||
{
|
||
int ret = 0;
|
||
const uint8_t *a_oid;
|
||
const uint8_t *b_oid;
|
||
size_t a_oid_len;
|
||
size_t b_oid_len;
|
||
int a_tag;
|
||
int b_tag;
|
||
const uint8_t *a_val;
|
||
const uint8_t *b_val;
|
||
size_t a_val_len;
|
||
size_t b_val_len;
|
||
const uint8_t *a_val_der;
|
||
const uint8_t *b_val_der;
|
||
size_t a_val_der_len;
|
||
size_t b_val_der_len;
|
||
|
||
if (x509_attr_type_and_value_from_der_ex(&a_oid, &a_oid_len, &a_tag,
|
||
&a_val, &a_val_len, &a_val_der, &a_val_der_len, &a, &alen) != 1
|
||
|| asn1_length_is_zero(alen) != 1
|
||
|| x509_attr_type_and_value_from_der_ex(&b_oid, &b_oid_len, &b_tag,
|
||
&b_val, &b_val_len, &b_val_der, &b_val_der_len, &b, &blen) != 1
|
||
|| asn1_length_is_zero(blen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (a_oid_len != b_oid_len || memcmp(a_oid, b_oid, a_oid_len) != 0) {
|
||
ret = 0;
|
||
} else if (a_val_der_len == b_val_der_len
|
||
&& memcmp(a_val_der, b_val_der, a_val_der_len) == 0) {
|
||
ret = 1;
|
||
} else if (asn1_tag_is_cstring(a_tag) && asn1_tag_is_cstring(b_tag)) {
|
||
ret = x509_name_string_normalized_equ(a_tag, a_val, a_val_len, b_tag, b_val, b_val_len);
|
||
if (ret < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_rdn_count(const uint8_t *d, size_t dlen, size_t *count)
|
||
{
|
||
int ret = -1;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
size_t n = 0;
|
||
|
||
if (!count) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
while (dlen) {
|
||
if (asn1_sequence_from_der(&p, &len, &d, &dlen) != 1) {
|
||
error_print();
|
||
goto end;
|
||
}
|
||
n++;
|
||
}
|
||
*count = n;
|
||
ret = 1;
|
||
end:
|
||
return ret;
|
||
}
|
||
|
||
/*
|
||
* 统计一个 RDN SET 中和给定 AttributeTypeAndValue 规范化相等的项数。
|
||
*
|
||
* 例如同一个 RDN 允许包含多个 AVA：
|
||
* SET {
|
||
* commonName = "Alice",
|
||
* commonName = " ALICE "
|
||
* }
|
||
* 如果待匹配的 AVA 是 commonName = "alice"，规范化比较会使 count == 2。
|
||
*/
|
||
static int x509_rdn_count_attr_type_and_value(const uint8_t *rdn, size_t rdnlen,
|
||
const uint8_t *ava, size_t avalen, size_t *count)
|
||
{
|
||
int ret;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
size_t n = 0;
|
||
|
||
if (!count) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
while (rdnlen) {
|
||
if (asn1_any_from_der(&p, &len, &rdn, &rdnlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_attr_type_and_value_normalized_equ(ava, avalen, p, len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret) {
|
||
n++;
|
||
}
|
||
}
|
||
*count = n;
|
||
return 1;
|
||
}
|
||
|
||
static int x509_rdn_normalized_equ(const uint8_t *a, size_t alen, const uint8_t *b, size_t blen)
|
||
{
|
||
int ret = 0;
|
||
const uint8_t *a_orig = a;
|
||
size_t a_orig_len = alen;
|
||
const uint8_t *a_ava;
|
||
size_t a_ava_len;
|
||
size_t a_count = 0;
|
||
size_t b_count = 0;
|
||
size_t a_ava_count;
|
||
size_t b_ava_count;
|
||
size_t prev_len;
|
||
|
||
if (x509_rdn_count(a, alen, &a_count) != 1
|
||
|| x509_rdn_count(b, blen, &b_count) != 1) {
|
||
error_print();
|
||
ret = -1;
|
||
goto end;
|
||
}
|
||
if (a_count != b_count) {
|
||
goto end;
|
||
}
|
||
|
||
while (alen) {
|
||
if (asn1_any_from_der(&a_ava, &a_ava_len, &a, &alen) != 1) {
|
||
error_print();
|
||
ret = -1;
|
||
goto end;
|
||
}
|
||
prev_len = (size_t)(a_ava - a_orig);
|
||
if (prev_len) {
|
||
if (x509_rdn_count_attr_type_and_value(a_orig, prev_len, a_ava, a_ava_len, &a_ava_count) != 1) {
|
||
error_print();
|
||
ret = -1;
|
||
goto end;
|
||
}
|
||
if (a_ava_count) {
|
||
continue;
|
||
}
|
||
}
|
||
if (x509_rdn_count_attr_type_and_value(a_orig, a_orig_len, a_ava, a_ava_len, &a_ava_count) != 1
|
||
|| x509_rdn_count_attr_type_and_value(b, blen, a_ava, a_ava_len, &b_ava_count) != 1) {
|
||
error_print();
|
||
ret = -1;
|
||
goto end;
|
||
}
|
||
if (a_ava_count != b_ava_count) {
|
||
goto end;
|
||
}
|
||
}
|
||
ret = 1;
|
||
end:
|
||
return ret;
|
||
}
|
||
|
||
int x509_name_normalized_equ(const uint8_t *a, size_t alen, const uint8_t *b, size_t blen)
|
||
{
|
||
int ret;
|
||
const uint8_t *a_rdn;
|
||
const uint8_t *b_rdn;
|
||
size_t a_rdn_len;
|
||
size_t b_rdn_len;
|
||
|
||
if ((!a && alen) || (!b && blen)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
while (alen && blen) {
|
||
if (asn1_set_from_der(&a_rdn, &a_rdn_len, &a, &alen) != 1
|
||
|| asn1_set_from_der(&b_rdn, &b_rdn_len, &b, &blen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
ret = x509_rdn_normalized_equ(a_rdn, a_rdn_len, b_rdn, b_rdn_len);
|
||
if (ret < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
if (alen || blen) {
|
||
return 0;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int asn1_utf8_string_code_point_from_bytes(uint32_t *code_point, const uint8_t **in, size_t *inlen)
|
||
{
|
||
const uint8_t *p;
|
||
size_t rem;
|
||
uint32_t cp;
|
||
|
||
if (!code_point || !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*inlen == 0) {
|
||
return 0;
|
||
}
|
||
|
||
p = *in;
|
||
rem = *inlen;
|
||
if (p[0] < 0x80) {
|
||
cp = p[0];
|
||
p++;
|
||
} else if ((p[0] & 0xe0) == 0xc0) {
|
||
if (rem < 2 || (p[1] & 0xc0) != 0x80 || p[0] < 0xc2) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
cp = ((uint32_t)(p[0] & 0x1f) << 6) | (p[1] & 0x3f);
|
||
p += 2;
|
||
} else if ((p[0] & 0xf0) == 0xe0) {
|
||
if (rem < 3
|
||
|| (p[1] & 0xc0) != 0x80
|
||
|| (p[2] & 0xc0) != 0x80
|
||
|| (p[0] == 0xe0 && p[1] < 0xa0)
|
||
|| (p[0] == 0xed && p[1] >= 0xa0)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
cp = ((uint32_t)(p[0] & 0x0f) << 12)
|
||
| ((uint32_t)(p[1] & 0x3f) << 6)
|
||
| (p[2] & 0x3f);
|
||
p += 3;
|
||
} else if ((p[0] & 0xf8) == 0xf0) {
|
||
if (rem < 4
|
||
|| (p[1] & 0xc0) != 0x80
|
||
|| (p[2] & 0xc0) != 0x80
|
||
|| (p[3] & 0xc0) != 0x80
|
||
|| (p[0] == 0xf0 && p[1] < 0x90)
|
||
|| p[0] > 0xf4
|
||
|| (p[0] == 0xf4 && p[1] >= 0x90)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
cp = ((uint32_t)(p[0] & 0x07) << 18)
|
||
| ((uint32_t)(p[1] & 0x3f) << 12)
|
||
| ((uint32_t)(p[2] & 0x3f) << 6)
|
||
| (p[3] & 0x3f);
|
||
p += 4;
|
||
} else {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
*code_point = cp;
|
||
*inlen -= (size_t)(p - *in);
|
||
*in = p;
|
||
return 1;
|
||
}
|
||
|
||
int asn1_printable_string_code_point_from_bytes(uint32_t *code_point, const uint8_t **in, size_t *inlen)
|
||
{
|
||
if (!code_point || !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*inlen == 0) {
|
||
return 0;
|
||
}
|
||
if (asn1_string_is_printable_string((const char *)*in, 1) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*code_point = **in;
|
||
(*in)++;
|
||
(*inlen)--;
|
||
return 1;
|
||
}
|
||
|
||
int asn1_ia5_string_code_point_from_bytes(uint32_t *code_point, const uint8_t **in, size_t *inlen)
|
||
{
|
||
if (!code_point || !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*inlen == 0) {
|
||
return 0;
|
||
}
|
||
if (asn1_string_is_ia5_string((const char *)*in, 1) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*code_point = **in;
|
||
(*in)++;
|
||
(*inlen)--;
|
||
return 1;
|
||
}
|
||
|
||
int asn1_bmp_string_code_point_from_bytes(uint32_t *code_point, const uint8_t **in, size_t *inlen)
|
||
{
|
||
if (!code_point || !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*inlen == 0) {
|
||
return 0;
|
||
}
|
||
if (*inlen < 2 || *inlen % 2) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*code_point = GETU16(*in);
|
||
*in += 2;
|
||
*inlen -= 2;
|
||
return 1;
|
||
}
|
||
|
||
int asn1_universal_string_code_point_from_bytes(uint32_t *code_point, const uint8_t **in, size_t *inlen)
|
||
{
|
||
if (!code_point || !in || !*in || !inlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (*inlen == 0) {
|
||
return 0;
|
||
}
|
||
if (*inlen < 4 || *inlen % 4) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*code_point = GETU32(*in);
|
||
*in += 4;
|
||
*inlen -= 4;
|
||
return 1;
|
||
}
|
||
|
||
// GeneralNames 子树匹配
|
||
|
||
static int x509_ascii_char_equ_case_insensitive(uint8_t a, uint8_t b)
|
||
{
|
||
if ('A' <= a && a <= 'Z') {
|
||
a += 'a' - 'A';
|
||
}
|
||
if ('A' <= b && b <= 'Z') {
|
||
b += 'a' - 'A';
|
||
}
|
||
return a == b;
|
||
}
|
||
|
||
static int x509_ia5_string_equ_case_insensitive(
|
||
const uint8_t *a, size_t alen, const uint8_t *b, size_t blen)
|
||
{
|
||
size_t i;
|
||
|
||
if ((!a && alen) || (!b && blen)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (alen != blen) {
|
||
return 0;
|
||
}
|
||
for (i = 0; i < alen; i++) {
|
||
if (!x509_ascii_char_equ_case_insensitive(a[i], b[i])) {
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_ia5_string_has_suffix_case_insensitive(
|
||
const uint8_t *str, size_t str_len, const uint8_t *suffix, size_t suffix_len)
|
||
{
|
||
int ret;
|
||
|
||
if ((!str && str_len) || (!suffix && suffix_len)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (str_len < suffix_len) {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_ia5_string_equ_case_insensitive(
|
||
str + str_len - suffix_len, suffix_len, suffix, suffix_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_dns_name_is_in_subtree(
|
||
const uint8_t *dns, size_t dns_len, const uint8_t *base, size_t base_len)
|
||
{
|
||
int ret;
|
||
|
||
if (!dns || !dns_len || !base || !base_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (base[0] == '.') {
|
||
if (dns_len <= base_len) {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_ia5_string_has_suffix_case_insensitive(dns, dns_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
if ((ret = x509_ia5_string_equ_case_insensitive(dns, dns_len, base, base_len)) != 0) {
|
||
if (ret < 0) error_print();
|
||
return ret;
|
||
}
|
||
if (dns_len <= base_len || dns[dns_len - base_len - 1] != '.') {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_ia5_string_has_suffix_case_insensitive(dns, dns_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_rfc822_name_get_host(
|
||
const uint8_t *name, size_t name_len, const uint8_t **host, size_t *host_len)
|
||
{
|
||
size_t i;
|
||
const uint8_t *p = NULL;
|
||
|
||
if (!name || !name_len || !host || !host_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*host = NULL;
|
||
*host_len = 0;
|
||
|
||
for (i = 0; i < name_len; i++) {
|
||
if (name[i] == '@') {
|
||
p = name + i + 1;
|
||
}
|
||
}
|
||
if (!p || p == name + name_len) {
|
||
return 0;
|
||
}
|
||
*host = p;
|
||
*host_len = (size_t)(name + name_len - p);
|
||
return 1;
|
||
}
|
||
|
||
static int x509_rfc822_name_is_in_subtree(
|
||
const uint8_t *name, size_t name_len, const uint8_t *base, size_t base_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *host;
|
||
size_t host_len;
|
||
|
||
if (!name || !name_len || !base || !base_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (memchr(base, '@', base_len)) {
|
||
if ((ret = x509_ia5_string_equ_case_insensitive(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
if ((ret = x509_rfc822_name_get_host(name, name_len, &host, &host_len)) != 1) {
|
||
if (ret < 0) error_print();
|
||
return ret;
|
||
}
|
||
if (base[0] == '.') {
|
||
if (host_len <= base_len) {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_ia5_string_has_suffix_case_insensitive(host, host_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
if ((ret = x509_ia5_string_equ_case_insensitive(host, host_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_uri_get_host(
|
||
const uint8_t *uri, size_t urilen, const uint8_t **host, size_t *host_len)
|
||
{
|
||
const uint8_t *p;
|
||
const uint8_t *end;
|
||
const uint8_t *authority_end;
|
||
const uint8_t *last_at = NULL;
|
||
const uint8_t *q;
|
||
|
||
if (!uri || !urilen || !host || !host_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*host = NULL;
|
||
*host_len = 0;
|
||
|
||
p = uri;
|
||
end = uri + urilen;
|
||
while (p + 2 < end) {
|
||
if (p[0] == ':' && p[1] == '/' && p[2] == '/') {
|
||
p += 3;
|
||
break;
|
||
}
|
||
p++;
|
||
}
|
||
if (p + 2 >= end) {
|
||
return 0;
|
||
}
|
||
|
||
authority_end = p;
|
||
while (authority_end < end
|
||
&& *authority_end != '/'
|
||
&& *authority_end != '?'
|
||
&& *authority_end != '#') {
|
||
if (*authority_end == '@') {
|
||
last_at = authority_end;
|
||
}
|
||
authority_end++;
|
||
}
|
||
if (last_at) {
|
||
p = last_at + 1;
|
||
}
|
||
if (p == authority_end) {
|
||
return 0;
|
||
}
|
||
|
||
if (*p == '[') {
|
||
q = p + 1;
|
||
while (q < authority_end && *q != ']') {
|
||
q++;
|
||
}
|
||
if (q == authority_end || q == p + 1) {
|
||
return 0;
|
||
}
|
||
*host = p + 1;
|
||
*host_len = (size_t)(q - p - 1);
|
||
return 1;
|
||
}
|
||
|
||
q = p;
|
||
while (q < authority_end && *q != ':') {
|
||
q++;
|
||
}
|
||
if (q == p) {
|
||
return 0;
|
||
}
|
||
*host = p;
|
||
*host_len = (size_t)(q - p);
|
||
return 1;
|
||
}
|
||
|
||
static int x509_uri_name_is_in_subtree(
|
||
const uint8_t *uri, size_t uri_len, const uint8_t *base, size_t base_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *host;
|
||
size_t host_len;
|
||
|
||
if (!uri || !uri_len || !base || !base_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_uri_get_host(uri, uri_len, &host, &host_len)) != 1) {
|
||
if (ret < 0) error_print();
|
||
return ret;
|
||
}
|
||
if (base[0] == '.') {
|
||
if (host_len <= base_len) {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_ia5_string_has_suffix_case_insensitive(host, host_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
if ((ret = x509_ia5_string_equ_case_insensitive(host, host_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_ip_address_is_in_subtree(
|
||
const uint8_t *ip, size_t ip_len, const uint8_t *base, size_t base_len)
|
||
{
|
||
const uint8_t *addr;
|
||
const uint8_t *mask;
|
||
size_t i;
|
||
|
||
if (!ip || !base) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ip_len != 4 && ip_len != 16) || base_len != ip_len * 2) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
addr = base;
|
||
mask = base + ip_len;
|
||
for (i = 0; i < ip_len; i++) {
|
||
if ((ip[i] & mask[i]) != (addr[i] & mask[i])) {
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_registered_id_is_in_subtree(
|
||
const uint8_t *oid, size_t oid_len, const uint8_t *base, size_t base_len)
|
||
{
|
||
uint32_t oid_nodes[32];
|
||
uint32_t base_nodes[32];
|
||
size_t oid_nodes_count;
|
||
size_t base_nodes_count;
|
||
size_t i;
|
||
|
||
if (!oid || !oid_len || !base || !base_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (asn1_object_identifier_from_octets(oid_nodes, &oid_nodes_count, oid, oid_len) != 1
|
||
|| asn1_object_identifier_from_octets(base_nodes, &base_nodes_count, base, base_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (oid_nodes_count < base_nodes_count) {
|
||
return 0;
|
||
}
|
||
for (i = 0; i < base_nodes_count; i++) {
|
||
if (oid_nodes[i] != base_nodes[i]) {
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_name_is_in_subtree(const uint8_t *name, size_t name_len,
|
||
const uint8_t *base, size_t base_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *name_rdn;
|
||
const uint8_t *base_rdn;
|
||
size_t name_rdn_len;
|
||
size_t base_rdn_len;
|
||
|
||
if ((!name && name_len) || (!base && base_len)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (base_len) {
|
||
if (!name_len) {
|
||
return 0;
|
||
}
|
||
if (asn1_set_from_der(&base_rdn, &base_rdn_len, &base, &base_len) != 1
|
||
|| asn1_set_from_der(&name_rdn, &name_rdn_len, &name, &name_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_rdn_normalized_equ(name_rdn, name_rdn_len, base_rdn, base_rdn_len)) != 1) {
|
||
if (ret < 0) error_print();
|
||
return ret;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int x509_general_name_normalized_equ(int a_choice, const uint8_t *a, size_t alen,
|
||
int b_choice, const uint8_t *b, size_t blen)
|
||
{
|
||
int ret;
|
||
|
||
if (a_choice != b_choice) {
|
||
return 0;
|
||
}
|
||
if (x509_general_name_check(a_choice, a, alen) != 1
|
||
|| x509_general_name_check(b_choice, b, blen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
switch (a_choice) {
|
||
case X509_gn_rfc822_name:
|
||
case X509_gn_dns_name:
|
||
if ((ret = x509_ia5_string_equ_case_insensitive(a, alen, b, blen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_directory_name:
|
||
if ((ret = x509_name_normalized_equ(a, alen, b, blen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_other_name:
|
||
case X509_gn_x400_address:
|
||
case X509_gn_edi_party_name:
|
||
case X509_gn_uniform_resource_identifier:
|
||
case X509_gn_ip_address:
|
||
case X509_gn_registered_id:
|
||
if (alen == blen && memcmp(a, b, alen) == 0) {
|
||
return 1;
|
||
}
|
||
return 0;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
int x509_general_name_is_in_subtree(int name_choice, const uint8_t *name, size_t name_len,
|
||
int base_choice, const uint8_t *base, size_t base_len)
|
||
{
|
||
int ret;
|
||
|
||
if ((!name && name_len) || (!base && base_len) || !name_len || !base_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (name_choice != base_choice) {
|
||
return 0;
|
||
}
|
||
if (x509_general_name_check(name_choice, name, name_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
switch (name_choice) {
|
||
case X509_gn_rfc822_name:
|
||
if (asn1_string_is_ia5_string((const char *)base, base_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_rfc822_name_is_in_subtree(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_dns_name:
|
||
if (asn1_string_is_ia5_string((const char *)base, base_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_dns_name_is_in_subtree(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_directory_name:
|
||
if (x509_name_check(base, base_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_name_is_in_subtree(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_uniform_resource_identifier:
|
||
if (asn1_string_is_ia5_string((const char *)base, base_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_uri_name_is_in_subtree(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_ip_address:
|
||
if ((ret = x509_ip_address_is_in_subtree(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_registered_id:
|
||
if ((ret = x509_registered_id_is_in_subtree(name, name_len, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
case X509_gn_other_name:
|
||
case X509_gn_x400_address:
|
||
case X509_gn_edi_party_name:
|
||
if ((ret = x509_general_name_normalized_equ(name_choice, name, name_len,
|
||
base_choice, base, base_len)) != 1) {
|
||
if (ret < 0) error_print();
|
||
return ret;
|
||
}
|
||
return 1;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
int x509_general_name_is_in_general_subtree(int name_choice, const uint8_t *name, size_t name_len,
|
||
const uint8_t *general_subtree, size_t general_subtree_len)
|
||
{
|
||
int ret;
|
||
int base_choice;
|
||
const uint8_t *base;
|
||
size_t base_len;
|
||
int minimum = -1;
|
||
int maximum = -1;
|
||
|
||
if (!general_subtree || !general_subtree_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_general_subtree_from_der(&base_choice, &base, &base_len,
|
||
&minimum, &maximum, &general_subtree, &general_subtree_len) != 1
|
||
|| asn1_length_is_zero(general_subtree_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
/*
|
||
当前证书验证只支持 RFC 5280 profile 中的 GeneralSubtree：
|
||
minimum 必须为 0，maximum 必须缺省。x509_general_subtree_from_der()
|
||
已经把缺省 minimum 转换为 0，并用 maximum == -1 表示缺省。
|
||
如果遇到 minimum != 0 或 maximum present，当前实现不能静默忽略，
|
||
必须作为不支持的语义错误返回 -1。
|
||
*/
|
||
if (minimum != 0 || maximum >= 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_general_name_is_in_subtree(name_choice, name, name_len,
|
||
base_choice, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
int x509_general_name_is_in_general_subtrees(int name_choice, const uint8_t *name, size_t name_len,
|
||
const uint8_t *general_subtrees, size_t general_subtrees_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *general_subtree;
|
||
size_t general_subtree_len;
|
||
|
||
if (!general_subtrees || !general_subtrees_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (general_subtrees_len) {
|
||
if (asn1_any_from_der(&general_subtree, &general_subtree_len,
|
||
&general_subtrees, &general_subtrees_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_general_name_is_in_general_subtree(name_choice, name, name_len,
|
||
general_subtree, general_subtree_len)) != 0) {
|
||
if (ret < 0) error_print();
|
||
return ret;
|
||
}
|
||
}
|
||
return 0;
|
||
}
|
||
|
||
// end of general name in subtree
|
||
|
||
|
||
static int x509_general_subtree_from_der_for_verify(int *base_choice,
|
||
const uint8_t **base, size_t *base_len,
|
||
const uint8_t *general_subtree, size_t general_subtree_len)
|
||
{
|
||
int minimum = -1;
|
||
int maximum = -1;
|
||
|
||
if (!base_choice || !base || !base_len || !general_subtree || !general_subtree_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_general_subtree_from_der(base_choice, base, base_len,
|
||
&minimum, &maximum, &general_subtree, &general_subtree_len) != 1
|
||
|| asn1_length_is_zero(general_subtree_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (minimum != 0 || maximum >= 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_general_name_is_permitted_by_general_subtrees(int name_choice,
|
||
const uint8_t *name, size_t name_len,
|
||
const uint8_t *general_subtrees, size_t general_subtrees_len)
|
||
{
|
||
int ret;
|
||
int base_choice;
|
||
const uint8_t *general_subtree;
|
||
size_t general_subtree_len;
|
||
const uint8_t *base;
|
||
size_t base_len;
|
||
int has_base_choice = 0;
|
||
|
||
if (!name || !name_len || !general_subtrees || !general_subtrees_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (general_subtrees_len) {
|
||
if (asn1_any_from_der(&general_subtree, &general_subtree_len,
|
||
&general_subtrees, &general_subtrees_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_general_subtree_from_der_for_verify(&base_choice, &base, &base_len,
|
||
general_subtree, general_subtree_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (base_choice != name_choice) {
|
||
continue;
|
||
}
|
||
has_base_choice = 1;
|
||
if ((ret = x509_general_name_is_in_subtree(name_choice, name, name_len,
|
||
base_choice, base, base_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret) {
|
||
return 1;
|
||
}
|
||
}
|
||
if (has_base_choice) {
|
||
return 0;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_general_name_check_name_constraints(int choice,
|
||
const uint8_t *name, size_t name_len,
|
||
const uint8_t *permitted_subtrees, size_t permitted_subtrees_len,
|
||
const uint8_t *excluded_subtrees, size_t excluded_subtrees_len)
|
||
{
|
||
int ret;
|
||
|
||
if (!name || !name_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
if (excluded_subtrees_len) {
|
||
if (!excluded_subtrees) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_general_name_is_in_general_subtrees(choice, name, name_len,
|
||
excluded_subtrees, excluded_subtrees_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if (permitted_subtrees_len) {
|
||
if (!permitted_subtrees) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_general_name_is_permitted_by_general_subtrees(choice, name, name_len,
|
||
permitted_subtrees, permitted_subtrees_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_cert_subject_alt_name_check_name_constraints(const uint8_t *cert, size_t certlen,
|
||
const uint8_t *permitted_subtrees, size_t permitted_subtrees_len,
|
||
const uint8_t *excluded_subtrees, size_t excluded_subtrees_len)
|
||
{
|
||
int ret;
|
||
int critical;
|
||
int choice;
|
||
const uint8_t *exts;
|
||
size_t extslen;
|
||
const uint8_t *val;
|
||
size_t vlen;
|
||
const uint8_t *general_names;
|
||
size_t general_names_len;
|
||
const uint8_t *name;
|
||
size_t name_len;
|
||
|
||
if (!cert || !certlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_cert_get_exts(cert, certlen, &exts, &extslen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
/*
|
||
证书没有扩展时也就没有 subjectAltName 可检查。
|
||
这里把“未找到扩展”的 0 转换为“没有 SAN 违反约束”的 1。
|
||
*/
|
||
return 1;
|
||
}
|
||
if ((ret = x509_exts_get_ext_by_oid(exts, extslen, OID_ce_subject_alt_name,
|
||
&critical, &val, &vlen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
/*
|
||
没有 subjectAltName 扩展时，本函数只负责 SAN 的 NameConstraints 检查。
|
||
这里把“未找到 SAN”的 0 转换为“SAN 检查通过”的 1。
|
||
*/
|
||
return 1;
|
||
}
|
||
if (x509_general_names_from_der(&general_names, &general_names_len, &val, &vlen) != 1
|
||
|| asn1_length_is_zero(vlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (general_names_len) {
|
||
if (x509_general_name_from_der(&choice, &name, &name_len,
|
||
&general_names, &general_names_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_general_name_check_name_constraints(choice, name, name_len,
|
||
permitted_subtrees, permitted_subtrees_len,
|
||
excluded_subtrees, excluded_subtrees_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int x509_cert_check_name_constraints(const uint8_t *cert, size_t certlen,
|
||
const uint8_t *name_constraints, size_t name_constraints_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *p;
|
||
size_t len;
|
||
const uint8_t *permitted_subtrees;
|
||
size_t permitted_subtrees_len;
|
||
const uint8_t *excluded_subtrees;
|
||
size_t excluded_subtrees_len;
|
||
const uint8_t *subject;
|
||
size_t subject_len;
|
||
|
||
if (!cert || !certlen || !name_constraints || !name_constraints_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
p = name_constraints;
|
||
len = name_constraints_len;
|
||
if (x509_name_constraints_from_der(&permitted_subtrees, &permitted_subtrees_len,
|
||
&excluded_subtrees, &excluded_subtrees_len, &p, &len) != 1
|
||
|| asn1_length_is_zero(len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
if (x509_cert_get_subject(cert, certlen, &subject, &subject_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (subject_len) {
|
||
if ((ret = x509_general_name_check_name_constraints(X509_gn_directory_name,
|
||
subject, subject_len, permitted_subtrees, permitted_subtrees_len,
|
||
excluded_subtrees, excluded_subtrees_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
|
||
if ((ret = x509_cert_subject_alt_name_check_name_constraints(cert, certlen,
|
||
permitted_subtrees, permitted_subtrees_len,
|
||
excluded_subtrees, excluded_subtrees_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_cert_get_name_constraints(const uint8_t *cert, size_t certlen,
|
||
const uint8_t **name_constraints, size_t *name_constraints_len)
|
||
{
|
||
int ret;
|
||
int critical;
|
||
const uint8_t *exts;
|
||
size_t extslen;
|
||
|
||
if (!cert || !certlen || !name_constraints || !name_constraints_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*name_constraints = NULL;
|
||
*name_constraints_len = 0;
|
||
|
||
if ((ret = x509_cert_get_exts(cert, certlen, &exts, &extslen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_exts_get_ext_by_oid(exts, extslen, OID_ce_name_constraints,
|
||
&critical, name_constraints, name_constraints_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
static int x509_certs_check_name_constraints_by_name_constraints(
|
||
const uint8_t *cert_chain, size_t cert_chain_len,
|
||
const uint8_t *name_constraints, size_t name_constraints_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
|
||
if (!name_constraints || !name_constraints_len) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
while (cert_chain_len) {
|
||
if (x509_cert_from_der(&cert, &certlen, &cert_chain, &cert_chain_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_cert_check_name_constraints(cert, certlen,
|
||
name_constraints, name_constraints_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int x509_cert_is_self_issued(const uint8_t *cert, size_t certlen)
|
||
{
|
||
int ret;
|
||
const uint8_t *issuer;
|
||
size_t issuer_len;
|
||
const uint8_t *subject;
|
||
size_t subject_len;
|
||
|
||
if (!cert || !certlen) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_cert_get_issuer(cert, certlen, &issuer, &issuer_len) != 1
|
||
|| x509_cert_get_subject(cert, certlen, &subject, &subject_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_name_normalized_equ(issuer, issuer_len, subject, subject_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return ret;
|
||
}
|
||
|
||
int x509_certs_check_name_constraints(const uint8_t *cert_chain, size_t cert_chain_len,
|
||
const uint8_t *rootcacert, size_t rootcacertlen)
|
||
{
|
||
int ret;
|
||
const uint8_t *chain;
|
||
size_t chain_len;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
const uint8_t *name_constraints;
|
||
size_t name_constraints_len;
|
||
size_t checked_certs_len = 0;
|
||
|
||
if (!cert_chain || !cert_chain_len
|
||
|| (!rootcacert && rootcacertlen)
|
||
|| (rootcacert && !rootcacertlen)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
if (rootcacert) {
|
||
if ((ret = x509_cert_get_name_constraints(rootcacert, rootcacertlen,
|
||
&name_constraints, &name_constraints_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret) {
|
||
/*
|
||
根 CA 不在 cert_chain 中。传入根 CA 时，它的 NameConstraints
|
||
只在这里额外约束 cert_chain 中最靠近根的那张下级证书。
|
||
*/
|
||
if (x509_certs_get_last(cert_chain, cert_chain_len, &cert, &certlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_cert_check_name_constraints(cert, certlen,
|
||
name_constraints, name_constraints_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
|
||
chain = cert_chain;
|
||
chain_len = cert_chain_len;
|
||
while (chain_len) {
|
||
if (x509_cert_from_der(&cert, &certlen, &chain, &chain_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
/*
|
||
证书链按被验证证书到上级 CA 的顺序排列。当前证书中的
|
||
NameConstraints 只约束它之前已经出现的下级证书，不约束自己。
|
||
*/
|
||
if (checked_certs_len) {
|
||
if ((ret = x509_cert_get_name_constraints(cert, certlen,
|
||
&name_constraints, &name_constraints_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret) {
|
||
if ((ret = x509_certs_check_name_constraints_by_name_constraints(
|
||
cert_chain, checked_certs_len,
|
||
name_constraints, name_constraints_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
}
|
||
}
|
||
checked_certs_len += certlen;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_cert_get_basic_constraints(const uint8_t *cert, size_t certlen,
|
||
int *critical, int *ca, int *path_len_constraint)
|
||
{
|
||
int ret;
|
||
const uint8_t *exts;
|
||
size_t extslen;
|
||
const uint8_t *val;
|
||
size_t vlen;
|
||
|
||
if (!cert || !certlen || !critical || !ca || !path_len_constraint) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*critical = -1;
|
||
*ca = -1;
|
||
*path_len_constraint = -1;
|
||
|
||
if ((ret = x509_cert_get_exts(cert, certlen, &exts, &extslen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
if ((ret = x509_exts_get_ext_by_oid(exts, extslen, OID_ce_basic_constraints,
|
||
critical, &val, &vlen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
return 0;
|
||
}
|
||
if (x509_basic_constraints_from_der(ca, path_len_constraint, &val, &vlen) != 1
|
||
|| asn1_length_is_zero(vlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_cert_check_basic_constraints_by_type(const uint8_t *cert, size_t certlen,
|
||
int cert_type, int *path_len_constraint)
|
||
{
|
||
int has_basic_constraints;
|
||
int is_ca;
|
||
int critical;
|
||
int ca;
|
||
|
||
if (!cert || !certlen || !path_len_constraint) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*path_len_constraint = -1;
|
||
|
||
switch (cert_type) {
|
||
case X509_cert_server_auth:
|
||
case X509_cert_client_auth:
|
||
case X509_cert_server_key_encipher:
|
||
case X509_cert_client_key_encipher:
|
||
is_ca = 0;
|
||
break;
|
||
case X509_cert_ca:
|
||
case X509_cert_root_ca:
|
||
case X509_cert_crl_sign:
|
||
is_ca = 1;
|
||
break;
|
||
default:
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
if ((has_basic_constraints = x509_cert_get_basic_constraints(cert, certlen,
|
||
&critical, &ca, path_len_constraint)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (!has_basic_constraints) {
|
||
if (is_ca) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
} else {
|
||
if (x509_ext_check_critical(OID_ce_basic_constraints, is_ca, critical) != 1
|
||
|| x509_basic_constraints_check(ca, *path_len_constraint, cert_type) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
static int x509_certs_count_non_self_issued_ca_certs(const uint8_t *cert_chain,
|
||
size_t cert_chain_len, size_t *count)
|
||
{
|
||
int ret;
|
||
int is_first_cert = 1;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
|
||
if (!cert_chain || !cert_chain_len || !count) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*count = 0;
|
||
|
||
while (cert_chain_len) {
|
||
if (x509_cert_from_der(&cert, &certlen, &cert_chain, &cert_chain_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (is_first_cert) {
|
||
is_first_cert = 0;
|
||
continue;
|
||
}
|
||
|
||
/*
|
||
pathLenConstraint 统计的是当前 CA 之下的非 self-issued 中间 CA 数量。
|
||
链中第一张证书是实体证书，不计入；self-issued CA 也不计入。
|
||
*/
|
||
if ((ret = x509_cert_is_self_issued(cert, certlen)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret == 0) {
|
||
(*count)++;
|
||
}
|
||
}
|
||
return 1;
|
||
}
|
||
|
||
int x509_certs_check_basic_constraints(const uint8_t *cert_chain, size_t cert_chain_len,
|
||
const uint8_t *rootcacert, size_t rootcacertlen)
|
||
{
|
||
const uint8_t *chain;
|
||
size_t chain_len;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
size_t checked_certs_len;
|
||
size_t path_len;
|
||
int path_len_constraint;
|
||
|
||
if (!cert_chain || !cert_chain_len
|
||
|| (!rootcacert && rootcacertlen)
|
||
|| (rootcacert && !rootcacertlen)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
chain = cert_chain;
|
||
chain_len = cert_chain_len;
|
||
|
||
if (x509_cert_from_der(&cert, &certlen, &chain, &chain_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_cert_check_basic_constraints_by_type(cert, certlen,
|
||
X509_cert_server_auth, &path_len_constraint) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
checked_certs_len = certlen;
|
||
|
||
while (chain_len) {
|
||
if (x509_cert_from_der(&cert, &certlen, &chain, &chain_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_cert_check_basic_constraints_by_type(cert, certlen,
|
||
X509_cert_ca, &path_len_constraint) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_certs_count_non_self_issued_ca_certs(cert_chain,
|
||
checked_certs_len, &path_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (path_len_constraint >= 0 && path_len > (size_t)path_len_constraint) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
checked_certs_len += certlen;
|
||
}
|
||
|
||
if (rootcacert) {
|
||
if (x509_cert_check_basic_constraints_by_type(rootcacert, rootcacertlen,
|
||
X509_cert_root_ca, &path_len_constraint) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (x509_certs_count_non_self_issued_ca_certs(cert_chain,
|
||
cert_chain_len, &path_len) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (path_len_constraint >= 0 && path_len > (size_t)path_len_constraint) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
}
|
||
|
||
return 1;
|
||
}
|
||
|
||
int x509_cert_chain_find_root_ca_cert(const uint8_t *cert_chain, size_t cert_chain_len,
|
||
const uint8_t *rootcacerts, size_t rootcacertslen,
|
||
const uint8_t **rootcacert, size_t *rootcacertlen,
|
||
const char *signer_id, size_t signer_id_len)
|
||
{
|
||
int ret;
|
||
const uint8_t *cert;
|
||
size_t certlen;
|
||
const uint8_t *cacert;
|
||
size_t cacertlen;
|
||
int found_root = 0;
|
||
|
||
if (!cert_chain || !cert_chain_len
|
||
|| (!rootcacerts && rootcacertslen)
|
||
|| !rootcacert || !rootcacertlen
|
||
|| (!signer_id && signer_id_len)) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
*rootcacert = NULL;
|
||
*rootcacertlen = 0;
|
||
|
||
if (x509_certs_get_last(cert_chain, cert_chain_len, &cert, &certlen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
|
||
while (rootcacertslen) {
|
||
if (x509_cert_from_der(&cacert, &cacertlen, &rootcacerts, &rootcacertslen) != 1) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if ((ret = x509_cert_is_signed_by_root_ca_cert(cert, certlen, cacert, cacertlen,
|
||
signer_id, signer_id_len)) < 0) {
|
||
error_print();
|
||
return -1;
|
||
}
|
||
if (ret) {
|
||
*rootcacert = cacert;
|
||
*rootcacertlen = cacertlen;
|
||
found_root = 1;
|
||
break;
|
||
}
|
||
}
|
||
return found_root;
|
||
}
|