571 lines
20 KiB
C
571 lines
20 KiB
C
/*
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* X.509 base functions for creating certificates / CSRs
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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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#include "common.h"
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#if defined(MBEDTLS_X509_CREATE_C)
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#include "mbedtls/x509.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 <string.h>
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#include "mbedtls/platform.h"
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#include "mbedtls/asn1.h"
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/* Structure linking OIDs for X.509 DN AttributeTypes to their
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* string representations and default string encodings used by Mbed TLS. */
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typedef struct {
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const char *name; /* String representation of AttributeType, e.g.
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* "CN" or "emailAddress". */
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size_t name_len; /* Length of 'name', without trailing 0 byte. */
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const char *oid; /* String representation of OID of AttributeType,
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* as per RFC 5280, Appendix A.1. encoded as per
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* X.690 */
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int default_tag; /* The default character encoding used for the
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* given attribute type, e.g.
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* MBEDTLS_ASN1_UTF8_STRING for UTF-8. */
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} x509_attr_descriptor_t;
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#define ADD_STRLEN(s) s, sizeof(s) - 1
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/* X.509 DN attributes from RFC 5280, Appendix A.1. */
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static const x509_attr_descriptor_t x509_attrs[] =
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{
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{ ADD_STRLEN("CN"),
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MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("commonName"),
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MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("C"),
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MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING },
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{ ADD_STRLEN("countryName"),
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MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING },
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{ ADD_STRLEN("O"),
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MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("organizationName"),
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MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("L"),
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MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("locality"),
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MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("R"),
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MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING },
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{ ADD_STRLEN("OU"),
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MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("organizationalUnitName"),
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MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("ST"),
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MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("stateOrProvinceName"),
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MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("emailAddress"),
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MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING },
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{ ADD_STRLEN("serialNumber"),
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MBEDTLS_OID_AT_SERIAL_NUMBER, MBEDTLS_ASN1_PRINTABLE_STRING },
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{ ADD_STRLEN("postalAddress"),
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MBEDTLS_OID_AT_POSTAL_ADDRESS, MBEDTLS_ASN1_PRINTABLE_STRING },
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{ ADD_STRLEN("postalCode"),
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MBEDTLS_OID_AT_POSTAL_CODE, MBEDTLS_ASN1_PRINTABLE_STRING },
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{ ADD_STRLEN("dnQualifier"),
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MBEDTLS_OID_AT_DN_QUALIFIER, MBEDTLS_ASN1_PRINTABLE_STRING },
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{ ADD_STRLEN("title"),
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MBEDTLS_OID_AT_TITLE, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("surName"),
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MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("SN"),
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MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("givenName"),
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MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("GN"),
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MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("initials"),
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MBEDTLS_OID_AT_INITIALS, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("pseudonym"),
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MBEDTLS_OID_AT_PSEUDONYM, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("generationQualifier"),
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MBEDTLS_OID_AT_GENERATION_QUALIFIER, MBEDTLS_ASN1_UTF8_STRING },
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{ ADD_STRLEN("domainComponent"),
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MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING },
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{ ADD_STRLEN("DC"),
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MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING },
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{ NULL, 0, NULL, MBEDTLS_ASN1_NULL }
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};
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static const x509_attr_descriptor_t *x509_attr_descr_from_name(const char *name, size_t name_len)
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{
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const x509_attr_descriptor_t *cur;
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for (cur = x509_attrs; cur->name != NULL; cur++) {
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if (cur->name_len == name_len &&
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strncmp(cur->name, name, name_len) == 0) {
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break;
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}
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}
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if (cur->name == NULL) {
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return NULL;
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}
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return cur;
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}
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static int hex_to_int(char c)
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{
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return ('0' <= c && c <= '9') ? (c - '0') :
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('a' <= c && c <= 'f') ? (c - 'a' + 10) :
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('A' <= c && c <= 'F') ? (c - 'A' + 10) : -1;
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}
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static int hexpair_to_int(const char *hexpair)
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{
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int n1 = hex_to_int(*hexpair);
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int n2 = hex_to_int(*(hexpair + 1));
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if (n1 != -1 && n2 != -1) {
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return (n1 << 4) | n2;
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} else {
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return -1;
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}
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}
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static int parse_attribute_value_string(const char *s,
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int len,
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unsigned char *data,
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size_t *data_len)
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{
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const char *c;
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const char *end = s + len;
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unsigned char *d = data;
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int n;
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for (c = s; c < end; c++) {
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if (*c == '\\') {
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c++;
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/* Check for valid escaped characters as per RFC 4514 Section 3 */
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if (c + 1 < end && (n = hexpair_to_int(c)) != -1) {
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if (n == 0) {
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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*(d++) = n;
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c++;
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} else if (c < end && strchr(" ,=+<>#;\"\\", *c)) {
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*(d++) = *c;
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} else {
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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} else {
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*(d++) = *c;
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}
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if (d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE) {
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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}
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*data_len = d - data;
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return 0;
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}
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/** Parse a hexstring containing a DER-encoded string.
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*
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* \param s A string of \p len bytes hexadecimal digits.
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* \param len Number of bytes to read from \p s.
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* \param data Output buffer of size \p data_size.
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* On success, it contains the payload that's DER-encoded
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* in the input (content without the tag and length).
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* If the DER tag is a string tag, the payload is guaranteed
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* not to contain null bytes.
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* \param data_size Length of the \p data buffer.
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* \param data_len On success, the length of the parsed string.
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* It is guaranteed to be less than
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* #MBEDTLS_X509_MAX_DN_NAME_SIZE.
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* \param tag The ASN.1 tag that the payload in \p data is encoded in.
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*
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* \retval 0 on success.
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* \retval #MBEDTLS_ERR_X509_INVALID_NAME if \p s does not contain
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* a valid hexstring,
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* or if the decoded hexstring is not valid DER,
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* or if the payload does not fit in \p data,
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* or if the payload is more than
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* #MBEDTLS_X509_MAX_DN_NAME_SIZE bytes,
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* of if \p *tag is an ASN.1 string tag and the payload
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* contains a null byte.
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* \retval #MBEDTLS_ERR_X509_ALLOC_FAILED on low memory.
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*/
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static int parse_attribute_value_hex_der_encoded(const char *s,
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size_t len,
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unsigned char *data,
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size_t data_size,
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size_t *data_len,
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int *tag)
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{
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/* Step 1: preliminary length checks. */
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/* Each byte is encoded by exactly two hexadecimal digits. */
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if (len % 2 != 0) {
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/* Odd number of hex digits */
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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size_t const der_length = len / 2;
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if (der_length > MBEDTLS_X509_MAX_DN_NAME_SIZE + 4) {
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/* The payload would be more than MBEDTLS_X509_MAX_DN_NAME_SIZE
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* (after subtracting the ASN.1 tag and length). Reject this early
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* to avoid allocating a large intermediate buffer. */
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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if (der_length < 1) {
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/* Avoid empty-buffer shenanigans. A valid DER encoding is never
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* empty. */
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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/* Step 2: Decode the hex string into an intermediate buffer. */
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unsigned char *der = mbedtls_calloc(1, der_length);
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if (der == NULL) {
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return MBEDTLS_ERR_X509_ALLOC_FAILED;
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}
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/* Beyond this point, der needs to be freed on exit. */
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for (size_t i = 0; i < der_length; i++) {
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int c = hexpair_to_int(s + 2 * i);
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if (c < 0) {
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goto error;
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}
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der[i] = c;
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}
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/* Step 3: decode the DER. */
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/* We've checked that der_length >= 1 above. */
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*tag = der[0];
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{
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unsigned char *p = der + 1;
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if (mbedtls_asn1_get_len(&p, der + der_length, data_len) != 0) {
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goto error;
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}
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/* Now p points to the first byte of the payload inside der,
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* and *data_len is the length of the payload. */
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/* Step 4: payload validation */
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if (*data_len > MBEDTLS_X509_MAX_DN_NAME_SIZE) {
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goto error;
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}
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/* Strings must not contain null bytes. */
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if (MBEDTLS_ASN1_IS_STRING_TAG(*tag)) {
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for (size_t i = 0; i < *data_len; i++) {
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if (p[i] == 0) {
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goto error;
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}
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}
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}
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/* Step 5: output the payload. */
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if (*data_len > data_size) {
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goto error;
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}
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memcpy(data, p, *data_len);
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}
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mbedtls_free(der);
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return 0;
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error:
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mbedtls_free(der);
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return MBEDTLS_ERR_X509_INVALID_NAME;
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}
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int mbedtls_x509_string_to_names(mbedtls_asn1_named_data **head, const char *name)
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{
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int ret = MBEDTLS_ERR_X509_INVALID_NAME;
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int parse_ret = 0;
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const char *s = name, *c = s;
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const char *end = s + strlen(s);
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mbedtls_asn1_buf oid = { .p = NULL, .len = 0, .tag = MBEDTLS_ASN1_NULL };
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const x509_attr_descriptor_t *attr_descr = NULL;
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int in_attr_type = 1;
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int tag;
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int numericoid = 0;
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unsigned char data[MBEDTLS_X509_MAX_DN_NAME_SIZE];
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size_t data_len = 0;
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/* Clear existing chain if present */
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mbedtls_asn1_free_named_data_list(head);
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while (c <= end) {
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if (in_attr_type && *c == '=') {
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if ((attr_descr = x509_attr_descr_from_name(s, c - s)) == NULL) {
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if ((mbedtls_oid_from_numeric_string(&oid, s, c - s)) != 0) {
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return MBEDTLS_ERR_X509_INVALID_NAME;
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} else {
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numericoid = 1;
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}
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} else {
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oid.len = strlen(attr_descr->oid);
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oid.p = mbedtls_calloc(1, oid.len);
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memcpy(oid.p, attr_descr->oid, oid.len);
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numericoid = 0;
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}
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s = c + 1;
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in_attr_type = 0;
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}
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if (!in_attr_type && ((*c == ',' && *(c-1) != '\\') || c == end)) {
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if (s == c) {
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mbedtls_free(oid.p);
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return MBEDTLS_ERR_X509_INVALID_NAME;
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} else if (*s == '#') {
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/* We know that c >= s (loop invariant) and c != s (in this
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* else branch), hence c - s - 1 >= 0. */
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parse_ret = parse_attribute_value_hex_der_encoded(
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s + 1, c - s - 1,
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data, sizeof(data), &data_len, &tag);
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if (parse_ret != 0) {
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mbedtls_free(oid.p);
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return parse_ret;
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}
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} else {
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if (numericoid) {
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mbedtls_free(oid.p);
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return MBEDTLS_ERR_X509_INVALID_NAME;
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} else {
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if ((parse_ret =
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parse_attribute_value_string(s, (int) (c - s), data,
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&data_len)) != 0) {
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mbedtls_free(oid.p);
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return parse_ret;
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}
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tag = attr_descr->default_tag;
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}
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}
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mbedtls_asn1_named_data *cur =
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mbedtls_asn1_store_named_data(head, (char *) oid.p, oid.len,
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(unsigned char *) data,
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data_len);
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mbedtls_free(oid.p);
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oid.p = NULL;
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if (cur == NULL) {
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return MBEDTLS_ERR_X509_ALLOC_FAILED;
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}
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// set tagType
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cur->val.tag = tag;
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while (c < end && *(c + 1) == ' ') {
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c++;
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}
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s = c + 1;
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in_attr_type = 1;
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/* Successfully parsed one name, update ret to success */
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ret = 0;
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}
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c++;
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}
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if (oid.p != NULL) {
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mbedtls_free(oid.p);
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}
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return ret;
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}
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/* The first byte of the value in the mbedtls_asn1_named_data structure is reserved
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* to store the critical boolean for us
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*/
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int mbedtls_x509_set_extension(mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
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int critical, const unsigned char *val, size_t val_len)
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{
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mbedtls_asn1_named_data *cur;
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if ((cur = mbedtls_asn1_store_named_data(head, oid, oid_len,
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NULL, val_len + 1)) == NULL) {
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return MBEDTLS_ERR_X509_ALLOC_FAILED;
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}
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cur->val.p[0] = critical;
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memcpy(cur->val.p + 1, val, val_len);
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return 0;
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}
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/*
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* RelativeDistinguishedName ::=
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* SET OF AttributeTypeAndValue
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*
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* AttributeTypeAndValue ::= SEQUENCE {
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* type AttributeType,
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* value AttributeValue }
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*
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* AttributeType ::= OBJECT IDENTIFIER
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*
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* AttributeValue ::= ANY DEFINED BY AttributeType
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*/
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static int x509_write_name(unsigned char **p,
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unsigned char *start,
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mbedtls_asn1_named_data *cur_name)
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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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const char *oid = (const char *) cur_name->oid.p;
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size_t oid_len = cur_name->oid.len;
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const unsigned char *name = cur_name->val.p;
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size_t name_len = cur_name->val.len;
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// Write correct string tag and value
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tagged_string(p, start,
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cur_name->val.tag,
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(const char *) name,
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name_len));
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// Write OID
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//
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid,
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oid_len));
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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_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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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_CONSTRUCTED |
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MBEDTLS_ASN1_SET));
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return (int) len;
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}
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int mbedtls_x509_write_names(unsigned char **p, unsigned char *start,
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mbedtls_asn1_named_data *first)
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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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mbedtls_asn1_named_data *cur = first;
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while (cur != NULL) {
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MBEDTLS_ASN1_CHK_ADD(len, x509_write_name(p, start, cur));
|
|
cur = cur->next;
|
|
}
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE));
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start,
|
|
const char *oid, size_t oid_len,
|
|
unsigned char *sig, size_t size,
|
|
mbedtls_pk_type_t pk_alg)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
int write_null_par;
|
|
size_t len = 0;
|
|
|
|
if (*p < start || (size_t) (*p - start) < size) {
|
|
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
|
|
}
|
|
|
|
len = size;
|
|
(*p) -= len;
|
|
memcpy(*p, sig, len);
|
|
|
|
if (*p - start < 1) {
|
|
return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
|
|
}
|
|
|
|
*--(*p) = 0;
|
|
len += 1;
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_BIT_STRING));
|
|
|
|
// Write OID
|
|
//
|
|
if (pk_alg == MBEDTLS_PK_ECDSA) {
|
|
/*
|
|
* The AlgorithmIdentifier's parameters field must be absent for DSA/ECDSA signature
|
|
* algorithms, see https://www.rfc-editor.org/rfc/rfc5480#page-17 and
|
|
* https://www.rfc-editor.org/rfc/rfc5758#section-3.
|
|
*/
|
|
write_null_par = 0;
|
|
} else {
|
|
write_null_par = 1;
|
|
}
|
|
MBEDTLS_ASN1_CHK_ADD(len,
|
|
mbedtls_asn1_write_algorithm_identifier_ext(p, start, oid, oid_len,
|
|
0, write_null_par));
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
static int x509_write_extension(unsigned char **p, unsigned char *start,
|
|
mbedtls_asn1_named_data *ext)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len = 0;
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, ext->val.p + 1,
|
|
ext->val.len - 1));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, ext->val.len - 1));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OCTET_STRING));
|
|
|
|
if (ext->val.p[0] != 0) {
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_bool(p, start, 1));
|
|
}
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, ext->oid.p,
|
|
ext->oid.len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, ext->oid.len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OID));
|
|
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, len));
|
|
MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_CONSTRUCTED |
|
|
MBEDTLS_ASN1_SEQUENCE));
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
/*
|
|
* Extension ::= SEQUENCE {
|
|
* extnID OBJECT IDENTIFIER,
|
|
* critical BOOLEAN DEFAULT FALSE,
|
|
* extnValue OCTET STRING
|
|
* -- contains the DER encoding of an ASN.1 value
|
|
* -- corresponding to the extension type identified
|
|
* -- by extnID
|
|
* }
|
|
*/
|
|
int mbedtls_x509_write_extensions(unsigned char **p, unsigned char *start,
|
|
mbedtls_asn1_named_data *first)
|
|
{
|
|
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
|
|
size_t len = 0;
|
|
mbedtls_asn1_named_data *cur_ext = first;
|
|
|
|
while (cur_ext != NULL) {
|
|
MBEDTLS_ASN1_CHK_ADD(len, x509_write_extension(p, start, cur_ext));
|
|
cur_ext = cur_ext->next;
|
|
}
|
|
|
|
return (int) len;
|
|
}
|
|
|
|
#endif /* MBEDTLS_X509_CREATE_C */
|