376 lines
13 KiB
C
376 lines
13 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 OR GPL-2.0-or-later
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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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/* 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. */
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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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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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const char *s = name, *c = s;
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const char *end = s + strlen(s);
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const char *oid = NULL;
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const x509_attr_descriptor_t *attr_descr = NULL;
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int in_tag = 1;
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char data[MBEDTLS_X509_MAX_DN_NAME_SIZE];
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char *d = data;
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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_tag && *c == '=') {
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if ((attr_descr = x509_attr_descr_from_name(s, c - s)) == NULL) {
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ret = MBEDTLS_ERR_X509_UNKNOWN_OID;
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goto exit;
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}
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oid = attr_descr->oid;
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s = c + 1;
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in_tag = 0;
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d = data;
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}
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if (!in_tag && *c == '\\' && c != end) {
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c++;
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/* Check for valid escaped characters */
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if (c == end || *c != ',') {
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ret = MBEDTLS_ERR_X509_INVALID_NAME;
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goto exit;
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}
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} else if (!in_tag && (*c == ',' || c == end)) {
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mbedtls_asn1_named_data *cur =
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mbedtls_asn1_store_named_data(head, oid, strlen(oid),
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(unsigned char *) data,
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d - data);
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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 = attr_descr->default_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_tag = 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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if (!in_tag && s != c + 1) {
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*(d++) = *c;
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if (d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE) {
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ret = MBEDTLS_ERR_X509_INVALID_NAME;
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goto exit;
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}
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}
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c++;
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}
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exit:
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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 (val_len > (SIZE_MAX - 1)) {
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return MBEDTLS_ERR_X509_BAD_INPUT_DATA;
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}
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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));
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cur = cur->next;
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}
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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, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return (int) len;
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}
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int mbedtls_x509_write_sig(unsigned char **p, unsigned char *start,
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const char *oid, size_t oid_len,
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unsigned char *sig, size_t size,
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mbedtls_pk_type_t pk_alg)
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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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int write_null_par;
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size_t len = 0;
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if (*p < start || (size_t) (*p - start) < size) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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len = size;
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(*p) -= len;
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memcpy(*p, sig, len);
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if (*p - start < 1) {
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return MBEDTLS_ERR_ASN1_BUF_TOO_SMALL;
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}
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*--(*p) = 0;
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len += 1;
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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, MBEDTLS_ASN1_BIT_STRING));
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// Write OID
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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_null_par = 0;
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} else {
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write_null_par = 1;
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}
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MBEDTLS_ASN1_CHK_ADD(len,
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mbedtls_asn1_write_algorithm_identifier_ext(p, start, oid, oid_len,
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0, write_null_par));
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return (int) len;
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}
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static int x509_write_extension(unsigned char **p, unsigned char *start,
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mbedtls_asn1_named_data *ext)
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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_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, ext->val.p + 1,
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ext->val.len - 1));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, ext->val.len - 1));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OCTET_STRING));
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if (ext->val.p[0] != 0) {
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_bool(p, start, 1));
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}
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_raw_buffer(p, start, ext->oid.p,
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ext->oid.len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_len(p, start, ext->oid.len));
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MBEDTLS_ASN1_CHK_ADD(len, mbedtls_asn1_write_tag(p, start, MBEDTLS_ASN1_OID));
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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, MBEDTLS_ASN1_CONSTRUCTED |
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MBEDTLS_ASN1_SEQUENCE));
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return (int) len;
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}
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/*
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* Extension ::= SEQUENCE {
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* extnID OBJECT IDENTIFIER,
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* critical BOOLEAN DEFAULT FALSE,
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* extnValue OCTET STRING
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* -- contains the DER encoding of an ASN.1 value
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* -- corresponding to the extension type identified
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* -- by extnID
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* }
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*/
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int mbedtls_x509_write_extensions(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_ext = first;
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while (cur_ext != NULL) {
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MBEDTLS_ASN1_CHK_ADD(len, x509_write_extension(p, start, cur_ext));
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cur_ext = cur_ext->next;
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}
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return (int) len;
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}
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#endif /* MBEDTLS_X509_CREATE_C */
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