574 lines
17 KiB
C
574 lines
17 KiB
C
/*
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* X.509 Certificate Signing Request (CSR) parsing
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
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*/
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/*
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* The ITU-T X.509 standard defines a certificate format for PKI.
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*
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* http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
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* http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
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* http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
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*
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* http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
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* http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
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*/
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#include "common.h"
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#if defined(MBEDTLS_X509_CSR_PARSE_C)
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#include "mbedtls/x509_csr.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 <string.h>
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#if defined(MBEDTLS_PEM_PARSE_C)
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#include "mbedtls/pem.h"
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#endif
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#include "mbedtls/platform.h"
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#if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
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#include <stdio.h>
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#endif
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/*
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* Version ::= INTEGER { v1(0) }
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*/
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static int x509_csr_get_version(unsigned char **p,
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const unsigned char *end,
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int *ver)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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if ((ret = mbedtls_asn1_get_int(p, end, ver)) != 0) {
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if (ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG) {
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*ver = 0;
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return 0;
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}
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_VERSION, ret);
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}
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return 0;
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}
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/*
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* Parse CSR extension requests in DER format
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*/
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static int x509_csr_parse_extensions(mbedtls_x509_csr *csr,
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unsigned char **p, const unsigned char *end)
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{
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int ret;
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size_t len;
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unsigned char *end_ext_data;
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while (*p < end) {
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mbedtls_x509_buf extn_oid = { 0, 0, NULL };
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int ext_type = 0;
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/* Read sequence tag */
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if ((ret = mbedtls_asn1_get_tag(p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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end_ext_data = *p + len;
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/* Get extension ID */
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if ((ret = mbedtls_asn1_get_tag(p, end_ext_data, &extn_oid.len,
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MBEDTLS_ASN1_OID)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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extn_oid.tag = MBEDTLS_ASN1_OID;
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extn_oid.p = *p;
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*p += extn_oid.len;
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/* Data should be octet string type */
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if ((ret = mbedtls_asn1_get_tag(p, end_ext_data, &len,
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MBEDTLS_ASN1_OCTET_STRING)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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if (*p + len != end_ext_data) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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/*
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* Detect supported extensions and skip unsupported extensions
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*/
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ret = mbedtls_oid_get_x509_ext_type(&extn_oid, &ext_type);
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if (ret == 0) {
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/* Forbid repeated extensions */
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if ((csr->ext_types & ext_type) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
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MBEDTLS_ERR_ASN1_INVALID_DATA);
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}
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csr->ext_types |= ext_type;
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switch (ext_type) {
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case MBEDTLS_X509_EXT_KEY_USAGE:
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/* Parse key usage */
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if ((ret = mbedtls_x509_get_key_usage(p, end_ext_data,
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&csr->key_usage)) != 0) {
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return ret;
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}
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break;
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case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
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/* Parse subject alt name */
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if ((ret = mbedtls_x509_get_subject_alt_name(p, end_ext_data,
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&csr->subject_alt_names)) != 0) {
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return ret;
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}
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break;
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case MBEDTLS_X509_EXT_NS_CERT_TYPE:
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/* Parse netscape certificate type */
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if ((ret = mbedtls_x509_get_ns_cert_type(p, end_ext_data,
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&csr->ns_cert_type)) != 0) {
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return ret;
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}
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break;
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default:
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break;
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}
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}
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*p = end_ext_data;
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}
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if (*p != end) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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return 0;
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}
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/*
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* Parse CSR attributes in DER format
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*/
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static int x509_csr_parse_attributes(mbedtls_x509_csr *csr,
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const unsigned char *start, const unsigned char *end)
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{
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int ret;
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size_t len;
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unsigned char *end_attr_data;
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unsigned char **p = (unsigned char **) &start;
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while (*p < end) {
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mbedtls_x509_buf attr_oid = { 0, 0, NULL };
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if ((ret = mbedtls_asn1_get_tag(p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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end_attr_data = *p + len;
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/* Get attribute ID */
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if ((ret = mbedtls_asn1_get_tag(p, end_attr_data, &attr_oid.len,
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MBEDTLS_ASN1_OID)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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attr_oid.tag = MBEDTLS_ASN1_OID;
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attr_oid.p = *p;
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*p += attr_oid.len;
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/* Check that this is an extension-request attribute */
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if (MBEDTLS_OID_CMP(MBEDTLS_OID_PKCS9_CSR_EXT_REQ, &attr_oid) == 0) {
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if ((ret = mbedtls_asn1_get_tag(p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SET)) != 0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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if ((ret = mbedtls_asn1_get_tag(p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) !=
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0) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret);
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}
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if ((ret = x509_csr_parse_extensions(csr, p, *p + len)) != 0) {
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return ret;
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}
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if (*p != end_attr_data) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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}
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*p = end_attr_data;
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}
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if (*p != end) {
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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return 0;
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}
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/*
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* Parse a CSR in DER format
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*/
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int mbedtls_x509_csr_parse_der(mbedtls_x509_csr *csr,
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const unsigned char *buf, size_t buflen)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t len;
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unsigned char *p, *end;
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mbedtls_x509_buf sig_params;
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memset(&sig_params, 0, sizeof(mbedtls_x509_buf));
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/*
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* Check for valid input
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*/
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if (csr == NULL || buf == NULL || buflen == 0) {
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return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
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}
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mbedtls_x509_csr_init(csr);
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/*
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* first copy the raw DER data
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*/
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p = mbedtls_calloc(1, len = buflen);
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if (p == NULL) {
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return MBEDTLS_ERR_X509_ALLOC_FAILED;
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}
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memcpy(p, buf, buflen);
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csr->raw.p = p;
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csr->raw.len = len;
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end = p + len;
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/*
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* CertificationRequest ::= SEQUENCE {
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* certificationRequestInfo CertificationRequestInfo,
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* signatureAlgorithm AlgorithmIdentifier,
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* signature BIT STRING
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* }
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERR_X509_INVALID_FORMAT;
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}
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if (len != (size_t) (end - p)) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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/*
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* CertificationRequestInfo ::= SEQUENCE {
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*/
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csr->cri.p = p;
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
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}
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end = p + len;
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csr->cri.len = end - csr->cri.p;
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/*
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* Version ::= INTEGER { v1(0) }
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*/
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if ((ret = x509_csr_get_version(&p, end, &csr->version)) != 0) {
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mbedtls_x509_csr_free(csr);
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return ret;
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}
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if (csr->version != 0) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERR_X509_UNKNOWN_VERSION;
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}
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csr->version++;
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/*
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* subject Name
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*/
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csr->subject_raw.p = p;
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE)) != 0) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
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}
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if ((ret = mbedtls_x509_get_name(&p, p + len, &csr->subject)) != 0) {
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mbedtls_x509_csr_free(csr);
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return ret;
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}
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csr->subject_raw.len = p - csr->subject_raw.p;
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/*
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* subjectPKInfo SubjectPublicKeyInfo
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*/
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if ((ret = mbedtls_pk_parse_subpubkey(&p, end, &csr->pk)) != 0) {
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mbedtls_x509_csr_free(csr);
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return ret;
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}
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/*
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* attributes [0] Attributes
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*
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* The list of possible attributes is open-ended, though RFC 2985
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* (PKCS#9) defines a few in section 5.4. We currently don't support any,
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* so we just ignore them. This is a safe thing to do as the worst thing
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* that could happen is that we issue a certificate that does not match
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* the requester's expectations - this cannot cause a violation of our
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* signature policies.
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*/
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if ((ret = mbedtls_asn1_get_tag(&p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC)) !=
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0) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT, ret);
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}
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if ((ret = x509_csr_parse_attributes(csr, p, p + len)) != 0) {
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mbedtls_x509_csr_free(csr);
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return ret;
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}
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p += len;
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end = csr->raw.p + csr->raw.len;
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/*
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* signatureAlgorithm AlgorithmIdentifier,
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* signature BIT STRING
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*/
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if ((ret = mbedtls_x509_get_alg(&p, end, &csr->sig_oid, &sig_params)) != 0) {
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mbedtls_x509_csr_free(csr);
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return ret;
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}
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if ((ret = mbedtls_x509_get_sig_alg(&csr->sig_oid, &sig_params,
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&csr->sig_md, &csr->sig_pk,
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&csr->sig_opts)) != 0) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG;
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}
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if ((ret = mbedtls_x509_get_sig(&p, end, &csr->sig)) != 0) {
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mbedtls_x509_csr_free(csr);
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return ret;
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}
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if (p != end) {
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mbedtls_x509_csr_free(csr);
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return MBEDTLS_ERROR_ADD(MBEDTLS_ERR_X509_INVALID_FORMAT,
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH);
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}
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return 0;
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}
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/*
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* Parse a CSR, allowing for PEM or raw DER encoding
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*/
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int mbedtls_x509_csr_parse(mbedtls_x509_csr *csr, const unsigned char *buf, size_t buflen)
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{
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#if defined(MBEDTLS_PEM_PARSE_C)
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t use_len;
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mbedtls_pem_context pem;
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#endif
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/*
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* Check for valid input
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*/
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if (csr == NULL || buf == NULL || buflen == 0) {
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return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
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}
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#if defined(MBEDTLS_PEM_PARSE_C)
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/* Avoid calling mbedtls_pem_read_buffer() on non-null-terminated string */
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if (buf[buflen - 1] == '\0') {
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mbedtls_pem_init(&pem);
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ret = mbedtls_pem_read_buffer(&pem,
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"-----BEGIN CERTIFICATE REQUEST-----",
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"-----END CERTIFICATE REQUEST-----",
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buf, NULL, 0, &use_len);
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if (ret == MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
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ret = mbedtls_pem_read_buffer(&pem,
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"-----BEGIN NEW CERTIFICATE REQUEST-----",
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"-----END NEW CERTIFICATE REQUEST-----",
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buf, NULL, 0, &use_len);
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}
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if (ret == 0) {
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/*
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* Was PEM encoded, parse the result
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*/
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ret = mbedtls_x509_csr_parse_der(csr, pem.buf, pem.buflen);
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}
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mbedtls_pem_free(&pem);
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if (ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT) {
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return ret;
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}
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}
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#endif /* MBEDTLS_PEM_PARSE_C */
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return mbedtls_x509_csr_parse_der(csr, buf, buflen);
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}
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#if defined(MBEDTLS_FS_IO)
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/*
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* Load a CSR into the structure
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*/
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int mbedtls_x509_csr_parse_file(mbedtls_x509_csr *csr, const char *path)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t n;
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unsigned char *buf;
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if ((ret = mbedtls_pk_load_file(path, &buf, &n)) != 0) {
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return ret;
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}
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ret = mbedtls_x509_csr_parse(csr, buf, n);
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mbedtls_zeroize_and_free(buf, n);
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return ret;
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}
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#endif /* MBEDTLS_FS_IO */
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#if !defined(MBEDTLS_X509_REMOVE_INFO)
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#define BEFORE_COLON 14
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#define BC "14"
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/*
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* Return an informational string about the CSR.
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*/
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int mbedtls_x509_csr_info(char *buf, size_t size, const char *prefix,
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const mbedtls_x509_csr *csr)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t n;
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char *p;
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char key_size_str[BEFORE_COLON];
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p = buf;
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n = size;
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ret = mbedtls_snprintf(p, n, "%sCSR version : %d",
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prefix, csr->version);
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_snprintf(p, n, "\n%ssubject name : ", prefix);
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_x509_dn_gets(p, n, &csr->subject);
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_snprintf(p, n, "\n%ssigned using : ", prefix);
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MBEDTLS_X509_SAFE_SNPRINTF;
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ret = mbedtls_x509_sig_alg_gets(p, n, &csr->sig_oid, csr->sig_pk, csr->sig_md,
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csr->sig_opts);
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
|
|
|
if ((ret = mbedtls_x509_key_size_helper(key_size_str, BEFORE_COLON,
|
|
mbedtls_pk_get_name(&csr->pk))) != 0) {
|
|
return ret;
|
|
}
|
|
|
|
ret = mbedtls_snprintf(p, n, "\n%s%-" BC "s: %d bits\n", prefix, key_size_str,
|
|
(int) mbedtls_pk_get_bitlen(&csr->pk));
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
|
|
|
/*
|
|
* Optional extensions
|
|
*/
|
|
|
|
if (csr->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME) {
|
|
ret = mbedtls_snprintf(p, n, "\n%ssubject alt name :", prefix);
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
|
|
|
if ((ret = mbedtls_x509_info_subject_alt_name(&p, &n,
|
|
&csr->subject_alt_names,
|
|
prefix)) != 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (csr->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE) {
|
|
ret = mbedtls_snprintf(p, n, "\n%scert. type : ", prefix);
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
|
|
|
if ((ret = mbedtls_x509_info_cert_type(&p, &n, csr->ns_cert_type)) != 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (csr->ext_types & MBEDTLS_X509_EXT_KEY_USAGE) {
|
|
ret = mbedtls_snprintf(p, n, "\n%skey usage : ", prefix);
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
|
|
|
if ((ret = mbedtls_x509_info_key_usage(&p, &n, csr->key_usage)) != 0) {
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
if (csr->ext_types != 0) {
|
|
ret = mbedtls_snprintf(p, n, "\n");
|
|
MBEDTLS_X509_SAFE_SNPRINTF;
|
|
}
|
|
|
|
return (int) (size - n);
|
|
}
|
|
#endif /* MBEDTLS_X509_REMOVE_INFO */
|
|
|
|
/*
|
|
* Initialize a CSR
|
|
*/
|
|
void mbedtls_x509_csr_init(mbedtls_x509_csr *csr)
|
|
{
|
|
memset(csr, 0, sizeof(mbedtls_x509_csr));
|
|
}
|
|
|
|
/*
|
|
* Unallocate all CSR data
|
|
*/
|
|
void mbedtls_x509_csr_free(mbedtls_x509_csr *csr)
|
|
{
|
|
if (csr == NULL) {
|
|
return;
|
|
}
|
|
|
|
mbedtls_pk_free(&csr->pk);
|
|
|
|
#if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
|
|
mbedtls_free(csr->sig_opts);
|
|
#endif
|
|
|
|
mbedtls_asn1_free_named_data_list_shallow(csr->subject.next);
|
|
mbedtls_asn1_sequence_free(csr->subject_alt_names.next);
|
|
|
|
if (csr->raw.p != NULL) {
|
|
mbedtls_zeroize_and_free(csr->raw.p, csr->raw.len);
|
|
}
|
|
|
|
mbedtls_platform_zeroize(csr, sizeof(mbedtls_x509_csr));
|
|
}
|
|
|
|
#endif /* MBEDTLS_X509_CSR_PARSE_C */
|