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- /*
- * X.509 base functions for creating certificates / CSRs
- *
- * Copyright The Mbed TLS Contributors
- * SPDX-License-Identifier: Apache-2.0
- *
- * Licensed under the Apache License, Version 2.0 (the "License"); you may
- * not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
- #include "common.h"
- #if defined(MBEDTLS_X509_CREATE_C)
- #include "mbedtls/x509.h"
- #include "mbedtls/asn1write.h"
- #include "mbedtls/error.h"
- #include "mbedtls/oid.h"
- #include <string.h>
- /* Structure linking OIDs for X.509 DN AttributeTypes to their
- * string representations and default string encodings used by Mbed TLS. */
- typedef struct {
- const char *name; /* String representation of AttributeType, e.g.
- * "CN" or "emailAddress". */
- size_t name_len; /* Length of 'name', without trailing 0 byte. */
- const char *oid; /* String representation of OID of AttributeType,
- * as per RFC 5280, Appendix A.1. */
- int default_tag; /* The default character encoding used for the
- * given attribute type, e.g.
- * MBEDTLS_ASN1_UTF8_STRING for UTF-8. */
- } x509_attr_descriptor_t;
- #define ADD_STRLEN(s) s, sizeof(s) - 1
- /* X.509 DN attributes from RFC 5280, Appendix A.1. */
- static const x509_attr_descriptor_t x509_attrs[] =
- {
- { ADD_STRLEN("CN"),
- MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("commonName"),
- MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("C"),
- MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING },
- { ADD_STRLEN("countryName"),
- MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING },
- { ADD_STRLEN("O"),
- MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("organizationName"),
- MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("L"),
- MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("locality"),
- MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("R"),
- MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING },
- { ADD_STRLEN("OU"),
- MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("organizationalUnitName"),
- MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("ST"),
- MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("stateOrProvinceName"),
- MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("emailAddress"),
- MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING },
- { ADD_STRLEN("serialNumber"),
- MBEDTLS_OID_AT_SERIAL_NUMBER, MBEDTLS_ASN1_PRINTABLE_STRING },
- { ADD_STRLEN("postalAddress"),
- MBEDTLS_OID_AT_POSTAL_ADDRESS, MBEDTLS_ASN1_PRINTABLE_STRING },
- { ADD_STRLEN("postalCode"),
- MBEDTLS_OID_AT_POSTAL_CODE, MBEDTLS_ASN1_PRINTABLE_STRING },
- { ADD_STRLEN("dnQualifier"),
- MBEDTLS_OID_AT_DN_QUALIFIER, MBEDTLS_ASN1_PRINTABLE_STRING },
- { ADD_STRLEN("title"),
- MBEDTLS_OID_AT_TITLE, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("surName"),
- MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("SN"),
- MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("givenName"),
- MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("GN"),
- MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("initials"),
- MBEDTLS_OID_AT_INITIALS, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("pseudonym"),
- MBEDTLS_OID_AT_PSEUDONYM, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("generationQualifier"),
- MBEDTLS_OID_AT_GENERATION_QUALIFIER, MBEDTLS_ASN1_UTF8_STRING },
- { ADD_STRLEN("domainComponent"),
- MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING },
- { ADD_STRLEN("DC"),
- MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING },
- { NULL, 0, NULL, MBEDTLS_ASN1_NULL }
- };
- static const x509_attr_descriptor_t *x509_attr_descr_from_name(const char *name, size_t name_len)
- {
- const x509_attr_descriptor_t *cur;
- for (cur = x509_attrs; cur->name != NULL; cur++) {
- if (cur->name_len == name_len &&
- strncmp(cur->name, name, name_len) == 0) {
- break;
- }
- }
- if (cur->name == NULL) {
- return NULL;
- }
- return cur;
- }
- int mbedtls_x509_string_to_names(mbedtls_asn1_named_data **head, const char *name)
- {
- int ret = MBEDTLS_ERR_X509_INVALID_NAME;
- const char *s = name, *c = s;
- const char *end = s + strlen(s);
- const char *oid = NULL;
- const x509_attr_descriptor_t *attr_descr = NULL;
- int in_tag = 1;
- char data[MBEDTLS_X509_MAX_DN_NAME_SIZE];
- char *d = data;
- /* Clear existing chain if present */
- mbedtls_asn1_free_named_data_list(head);
- while (c <= end) {
- if (in_tag && *c == '=') {
- if ((attr_descr = x509_attr_descr_from_name(s, c - s)) == NULL) {
- ret = MBEDTLS_ERR_X509_UNKNOWN_OID;
- goto exit;
- }
- oid = attr_descr->oid;
- s = c + 1;
- in_tag = 0;
- d = data;
- }
- if (!in_tag && *c == '\\' && c != end) {
- c++;
- /* Check for valid escaped characters */
- if (c == end || *c != ',') {
- ret = MBEDTLS_ERR_X509_INVALID_NAME;
- goto exit;
- }
- } else if (!in_tag && (*c == ',' || c == end)) {
- mbedtls_asn1_named_data *cur =
- mbedtls_asn1_store_named_data(head, oid, strlen(oid),
- (unsigned char *) data,
- d - data);
- if (cur == NULL) {
- return MBEDTLS_ERR_X509_ALLOC_FAILED;
- }
- // set tagType
- cur->val.tag = attr_descr->default_tag;
- while (c < end && *(c + 1) == ' ') {
- c++;
- }
- s = c + 1;
- in_tag = 1;
- /* Successfully parsed one name, update ret to success */
- ret = 0;
- }
- if (!in_tag && s != c + 1) {
- *(d++) = *c;
- if (d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE) {
- ret = MBEDTLS_ERR_X509_INVALID_NAME;
- goto exit;
- }
- }
- c++;
- }
- exit:
- return ret;
- }
- /* The first byte of the value in the mbedtls_asn1_named_data structure is reserved
- * to store the critical boolean for us
- */
- int mbedtls_x509_set_extension(mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
- int critical, const unsigned char *val, size_t val_len)
- {
- mbedtls_asn1_named_data *cur;
- if ((cur = mbedtls_asn1_store_named_data(head, oid, oid_len,
- NULL, val_len + 1)) == NULL) {
- return MBEDTLS_ERR_X509_ALLOC_FAILED;
- }
- cur->val.p[0] = critical;
- memcpy(cur->val.p + 1, val, val_len);
- return 0;
- }
- /*
- * RelativeDistinguishedName ::=
- * SET OF AttributeTypeAndValue
- *
- * AttributeTypeAndValue ::= SEQUENCE {
- * type AttributeType,
- * value AttributeValue }
- *
- * AttributeType ::= OBJECT IDENTIFIER
- *
- * AttributeValue ::= ANY DEFINED BY AttributeType
- */
- static int x509_write_name(unsigned char **p,
- unsigned char *start,
- mbedtls_asn1_named_data *cur_name)
- {
- int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
- size_t len = 0;
- const char *oid = (const char *) cur_name->oid.p;
- size_t oid_len = cur_name->oid.len;
- const unsigned char *name = cur_name->val.p;
- size_t name_len = cur_name->val.len;
- // Write correct string tag and value
- MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tagged_string(p, start,
- cur_name->val.tag,
- (const char *) name,
- name_len));
- // Write OID
- //
- MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_oid(p, start, oid,
- oid_len));
- 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));
- 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_SET));
- return (int) len;
- }
- int mbedtls_x509_write_names(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 = first;
- while (cur != NULL) {
- 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)
- {
- int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
- 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
- //
- MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_algorithm_identifier(p, start, oid,
- oid_len, 0));
- 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 */
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