558 lines
20 KiB
C
558 lines
20 KiB
C
/*
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* X.509 certificate writing
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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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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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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/*
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* References:
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* - certificates: RFC 5280, updated by RFC 6818
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* - CSRs: PKCS#10 v1.7 aka RFC 2986
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* - attributes: PKCS#9 v2.0 aka RFC 2985
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*/
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#include "common.h"
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#if defined(MBEDTLS_X509_CRT_WRITE_C)
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#include "mbedtls/x509_crt.h"
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#include "mbedtls/asn1write.h"
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#include "mbedtls/error.h"
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#include "mbedtls/oid.h"
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#include "mbedtls/platform_util.h"
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#include "mbedtls/sha1.h"
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#include <string.h>
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#if defined(MBEDTLS_PEM_WRITE_C)
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#include "mbedtls/pem.h"
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#endif /* MBEDTLS_PEM_WRITE_C */
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void mbedtls_x509write_crt_init(mbedtls_x509write_cert *ctx)
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{
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memset(ctx, 0, sizeof(mbedtls_x509write_cert));
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mbedtls_mpi_init(&ctx->serial);
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ctx->version = MBEDTLS_X509_CRT_VERSION_3;
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}
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void mbedtls_x509write_crt_free(mbedtls_x509write_cert *ctx)
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{
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mbedtls_mpi_free(&ctx->serial);
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mbedtls_asn1_free_named_data_list(&ctx->subject);
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mbedtls_asn1_free_named_data_list(&ctx->issuer);
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mbedtls_asn1_free_named_data_list(&ctx->extensions);
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mbedtls_platform_zeroize(ctx, sizeof(mbedtls_x509write_cert));
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}
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void mbedtls_x509write_crt_set_version(mbedtls_x509write_cert *ctx,
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int version)
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{
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ctx->version = version;
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}
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void mbedtls_x509write_crt_set_md_alg(mbedtls_x509write_cert *ctx,
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mbedtls_md_type_t md_alg)
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{
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ctx->md_alg = md_alg;
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}
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void mbedtls_x509write_crt_set_subject_key(mbedtls_x509write_cert *ctx,
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mbedtls_pk_context *key)
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{
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ctx->subject_key = key;
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}
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void mbedtls_x509write_crt_set_issuer_key(mbedtls_x509write_cert *ctx,
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mbedtls_pk_context *key)
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{
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ctx->issuer_key = key;
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}
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int mbedtls_x509write_crt_set_subject_name(mbedtls_x509write_cert *ctx,
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const char *subject_name)
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{
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return mbedtls_x509_string_to_names(&ctx->subject, subject_name);
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}
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int mbedtls_x509write_crt_set_issuer_name(mbedtls_x509write_cert *ctx,
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const char *issuer_name)
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{
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return mbedtls_x509_string_to_names(&ctx->issuer, issuer_name);
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}
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int mbedtls_x509write_crt_set_serial(mbedtls_x509write_cert *ctx,
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const mbedtls_mpi *serial)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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if (mbedtls_mpi_size(serial) > MBEDTLS_X509_RFC5280_MAX_SERIAL_LEN) {
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return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
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}
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if ((ret = mbedtls_mpi_copy(&ctx->serial, serial)) != 0) {
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return ret;
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}
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return 0;
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}
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int mbedtls_x509write_crt_set_validity(mbedtls_x509write_cert *ctx,
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const char *not_before,
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const char *not_after)
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{
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if (strlen(not_before) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1 ||
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strlen(not_after) != MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1) {
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return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
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}
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strncpy(ctx->not_before, not_before, MBEDTLS_X509_RFC5280_UTC_TIME_LEN);
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strncpy(ctx->not_after, not_after, MBEDTLS_X509_RFC5280_UTC_TIME_LEN);
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ctx->not_before[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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ctx->not_after[MBEDTLS_X509_RFC5280_UTC_TIME_LEN - 1] = 'Z';
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return 0;
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}
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int mbedtls_x509write_crt_set_extension(mbedtls_x509write_cert *ctx,
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const char *oid, size_t oid_len,
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int critical,
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const unsigned char *val, size_t val_len)
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{
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return mbedtls_x509_set_extension(&ctx->extensions, oid, oid_len,
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critical, val, val_len);
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}
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int mbedtls_x509write_crt_set_basic_constraints(mbedtls_x509write_cert *ctx,
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int is_ca, int max_pathlen)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char buf[9];
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset(buf, 0, sizeof(buf));
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if (is_ca && max_pathlen > 127) {
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return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
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}
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if (is_ca) {
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if (max_pathlen >= 0) {
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_int(&c, buf,
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max_pathlen));
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_bool(&c, buf, 1));
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return
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mbedtls_x509write_crt_set_extension(ctx, MBEDTLS_OID_BASIC_CONSTRAINTS,
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MBEDTLS_OID_SIZE(MBEDTLS_OID_BASIC_CONSTRAINTS),
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is_ca, buf + sizeof(buf) - len, len);
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}
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#if defined(MBEDTLS_SHA1_C)
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int mbedtls_x509write_crt_set_subject_key_identifier(mbedtls_x509write_cert *ctx)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset(buf, 0, sizeof(buf));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_pk_write_pubkey(&c, buf, ctx->subject_key));
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ret = mbedtls_sha1_ret(buf + sizeof(buf) - len, len,
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buf + sizeof(buf) - 20);
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if (ret != 0) {
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return ret;
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}
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c = buf + sizeof(buf) - 20;
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len = 20;
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_OCTET_STRING));
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return mbedtls_x509write_crt_set_extension(ctx,
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MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER,
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MBEDTLS_OID_SIZE(MBEDTLS_OID_SUBJECT_KEY_IDENTIFIER),
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0, buf + sizeof(buf) - len, len);
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}
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int mbedtls_x509write_crt_set_authority_key_identifier(mbedtls_x509write_cert *ctx)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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unsigned char buf[MBEDTLS_MPI_MAX_SIZE * 2 + 20]; /* tag, length + 2xMPI */
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unsigned char *c = buf + sizeof(buf);
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size_t len = 0;
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memset(buf, 0, sizeof(buf));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_pk_write_pubkey(&c, buf, ctx->issuer_key));
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ret = mbedtls_sha1_ret(buf + sizeof(buf) - len, len,
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buf + sizeof(buf) - 20);
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if (ret != 0) {
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return ret;
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}
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c = buf + sizeof(buf) - 20;
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len = 20;
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_CONTEXT_SPECIFIC | 0));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return mbedtls_x509write_crt_set_extension(
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ctx, MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER,
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MBEDTLS_OID_SIZE(MBEDTLS_OID_AUTHORITY_KEY_IDENTIFIER),
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0, buf + sizeof(buf) - len, len);
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}
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#endif /* MBEDTLS_SHA1_C */
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int mbedtls_x509write_crt_set_key_usage(mbedtls_x509write_cert *ctx,
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unsigned int key_usage)
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{
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unsigned char buf[5] = { 0 }, ku[2] = { 0 };
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unsigned char *c;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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const unsigned int allowed_bits = MBEDTLS_X509_KU_DIGITAL_SIGNATURE |
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MBEDTLS_X509_KU_NON_REPUDIATION |
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MBEDTLS_X509_KU_KEY_ENCIPHERMENT |
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MBEDTLS_X509_KU_DATA_ENCIPHERMENT |
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MBEDTLS_X509_KU_KEY_AGREEMENT |
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MBEDTLS_X509_KU_KEY_CERT_SIGN |
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MBEDTLS_X509_KU_CRL_SIGN |
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MBEDTLS_X509_KU_ENCIPHER_ONLY |
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MBEDTLS_X509_KU_DECIPHER_ONLY;
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/* Check that nothing other than the allowed flags is set */
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if ((key_usage & ~allowed_bits) != 0) {
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return MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
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}
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c = buf + 5;
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MBEDTLS_PUT_UINT16_LE(key_usage, ku, 0);
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ret = mbedtls_asn1_write_named_bitstring(&c, buf, ku, 9);
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if (ret < 0) {
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return ret;
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} else if (ret < 3 || ret > 5) {
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return MBEDTLS_ERR_X509_INVALID_FORMAT;
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}
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ret = mbedtls_x509write_crt_set_extension(ctx, MBEDTLS_OID_KEY_USAGE,
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MBEDTLS_OID_SIZE(MBEDTLS_OID_KEY_USAGE),
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1, c, (size_t) ret);
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if (ret != 0) {
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return ret;
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}
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return 0;
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}
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int mbedtls_x509write_crt_set_ns_cert_type(mbedtls_x509write_cert *ctx,
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unsigned char ns_cert_type)
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{
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unsigned char buf[4] = { 0 };
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unsigned char *c;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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c = buf + 4;
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ret = mbedtls_asn1_write_named_bitstring(&c, buf, &ns_cert_type, 8);
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if (ret < 3 || ret > 4) {
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return ret;
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}
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ret = mbedtls_x509write_crt_set_extension(ctx, MBEDTLS_OID_NS_CERT_TYPE,
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MBEDTLS_OID_SIZE(MBEDTLS_OID_NS_CERT_TYPE),
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0, c, (size_t) ret);
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if (ret != 0) {
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return ret;
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}
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return 0;
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}
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static int x509_write_time(unsigned char **p, unsigned char *start,
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const char *t, size_t size)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len = 0;
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/*
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* write MBEDTLS_ASN1_UTC_TIME if year < 2050 (2 bytes shorter)
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*/
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if (t[0] < '2' || (t[0] == '2' && t[1] == '0' && t[2] < '5')) {
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start,
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(const unsigned char *) t + 2,
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size - 2));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start,
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MBEDTLS_ASN1_UTC_TIME));
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} else {
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start,
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(const unsigned char *) t,
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size));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start,
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MBEDTLS_ASN1_GENERALIZED_TIME));
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}
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return (int) len;
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}
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int mbedtls_x509write_crt_der(mbedtls_x509write_cert *ctx,
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unsigned char *buf, size_t size,
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int (*f_rng)(void *, unsigned char *, size_t),
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void *p_rng)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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const char *sig_oid;
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size_t sig_oid_len = 0;
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unsigned char *c, *c2;
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unsigned char hash[64];
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unsigned char sig[MBEDTLS_PK_SIGNATURE_MAX_SIZE];
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size_t sub_len = 0, pub_len = 0, sig_and_oid_len = 0, sig_len;
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size_t len = 0;
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mbedtls_pk_type_t pk_alg;
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int write_sig_null_par;
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/*
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* Prepare data to be signed at the end of the target buffer
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*/
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c = buf + size;
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/* Signature algorithm needed in TBS, and later for actual signature */
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/* There's no direct way of extracting a signature algorithm
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* (represented as an element of mbedtls_pk_type_t) from a PK instance. */
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if (mbedtls_pk_can_do(ctx->issuer_key, MBEDTLS_PK_RSA)) {
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pk_alg = MBEDTLS_PK_RSA;
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} else if (mbedtls_pk_can_do(ctx->issuer_key, MBEDTLS_PK_ECDSA)) {
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pk_alg = MBEDTLS_PK_ECDSA;
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} else {
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return MBEDTLS_ERR_X509_INVALID_ALG;
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}
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if ((ret = mbedtls_oid_get_oid_by_sig_alg(pk_alg, ctx->md_alg,
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&sig_oid, &sig_oid_len)) != 0) {
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return ret;
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}
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/*
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* Extensions ::= SEQUENCE SIZE (1..MAX) OF Extension
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*/
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/* Only for v3 */
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if (ctx->version == MBEDTLS_X509_CRT_VERSION_3) {
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_x509_write_extensions(&c,
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buf, ctx->extensions));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC |
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MBEDTLS_ASN1_CONSTRUCTED | 3));
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}
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/*
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* SubjectPublicKeyInfo
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*/
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MBEDTLS_ASN1_CHK_ADD(pub_len,
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mbedtls_pk_write_pubkey_der(ctx->subject_key,
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buf, c - buf));
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c -= pub_len;
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len += pub_len;
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/*
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* Subject ::= Name
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*/
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_x509_write_names(&c, buf,
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ctx->subject));
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/*
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* Validity ::= SEQUENCE {
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* notBefore Time,
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* notAfter Time }
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*/
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sub_len = 0;
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MBEDTLS_ASN1_CHK_ADD(sub_len,
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x509_write_time(&c, buf, ctx->not_after,
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MBEDTLS_X509_RFC5280_UTC_TIME_LEN));
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MBEDTLS_ASN1_CHK_ADD(sub_len,
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x509_write_time(&c, buf, ctx->not_before,
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MBEDTLS_X509_RFC5280_UTC_TIME_LEN));
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len += sub_len;
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, sub_len));
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_tag(&c, buf,
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MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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/*
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* Issuer ::= Name
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*/
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_x509_write_names(&c, buf,
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ctx->issuer));
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/*
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* Signature ::= AlgorithmIdentifier
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*/
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if (pk_alg == MBEDTLS_PK_ECDSA) {
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/*
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* The AlgorithmIdentifier's parameters field must be absent for DSA/ECDSA signature
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* algorithms, see https://www.rfc-editor.org/rfc/rfc5480#page-17 and
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* https://www.rfc-editor.org/rfc/rfc5758#section-3.
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*/
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write_sig_null_par = 0;
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} else {
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write_sig_null_par = 1;
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}
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MBEDTLS_ASN1_CHK_ADD(len,
|
|
mbedtls_asn1_write_algorithm_identifier_ext(&c, buf,
|
|
sig_oid, strlen(sig_oid),
|
|
0, write_sig_null_par));
|
|
|
|
/*
|
|
* Serial ::= INTEGER
|
|
*/
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_mpi(&c, buf,
|
|
&ctx->serial));
|
|
|
|
/*
|
|
* Version ::= INTEGER { v1(0), v2(1), v3(2) }
|
|
*/
|
|
|
|
/* Can be omitted for v1 */
|
|
if (ctx->version != MBEDTLS_X509_CRT_VERSION_1) {
|
|
sub_len = 0;
|
|
MBEDTLS_ASN1_CHK_ADD(sub_len,
|
|
mbedtls_asn1_write_int(&c, buf, ctx->version));
|
|
len += sub_len;
|
|
MBEDTLS_ASN1_CHK_ADD(len,
|
|
mbedtls_asn1_write_len(&c, buf, sub_len));
|
|
MBEDTLS_ASN1_CHK_ADD(len,
|
|
mbedtls_asn1_write_tag(&c, buf,
|
|
MBEDTLS_ASN1_CONTEXT_SPECIFIC |
|
|
MBEDTLS_ASN1_CONSTRUCTED | 0));
|
|
}
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len,
|
|
mbedtls_asn1_write_tag(&c, buf, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE));
|
|
|
|
/*
|
|
* Make signature
|
|
*/
|
|
|
|
/* Compute hash of CRT. */
|
|
if ((ret = mbedtls_md(mbedtls_md_info_from_type(ctx->md_alg), c,
|
|
len, hash)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = mbedtls_pk_sign(ctx->issuer_key, ctx->md_alg,
|
|
hash, 0, sig, &sig_len,
|
|
f_rng, p_rng)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
/* Move CRT to the front of the buffer to have space
|
|
* for the signature. */
|
|
memmove(buf, c, len);
|
|
c = buf + len;
|
|
|
|
/* Add signature at the end of the buffer,
|
|
* making sure that it doesn't underflow
|
|
* into the CRT buffer. */
|
|
c2 = buf + size;
|
|
MBEDTLS_ASN1_CHK_ADD(sig_and_oid_len, mbedtls_x509_write_sig(&c2, c,
|
|
sig_oid, sig_oid_len,
|
|
sig, sig_len, pk_alg));
|
|
|
|
/*
|
|
* Memory layout after this step:
|
|
*
|
|
* buf c=buf+len c2 buf+size
|
|
* [CRT0,...,CRTn, UNUSED, ..., UNUSED, SIG0, ..., SIGm]
|
|
*/
|
|
|
|
/* Move raw CRT to just before the signature. */
|
|
c = c2 - len;
|
|
memmove(c, buf, len);
|
|
|
|
len += sig_and_oid_len;
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(&c, buf, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(&c, buf,
|
|
MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE));
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
#define PEM_BEGIN_CRT "-----BEGIN CERTIFICATE-----\n"
|
|
#define PEM_END_CRT "-----END CERTIFICATE-----\n"
|
|
|
|
#if defined(MBEDTLS_PEM_WRITE_C)
|
|
int mbedtls_x509write_crt_pem(mbedtls_x509write_cert *crt,
|
|
unsigned char *buf, size_t size,
|
|
int (*f_rng)(void *, unsigned char *, size_t),
|
|
void *p_rng)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t olen;
|
|
|
|
if ((ret = mbedtls_x509write_crt_der(crt, buf, size,
|
|
f_rng, p_rng)) < 0) {
|
|
return ret;
|
|
}
|
|
|
|
if ((ret = mbedtls_pem_write_buffer(PEM_BEGIN_CRT, PEM_END_CRT,
|
|
buf + size - ret, ret,
|
|
buf, size, &olen)) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
#endif /* MBEDTLS_PEM_WRITE_C */
|
|
|
|
#endif /* MBEDTLS_X509_CRT_WRITE_C */
|