375 lines
13 KiB
C
375 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
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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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/* 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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if ( cur->name == NULL )
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return( NULL );
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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 = 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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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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{
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if( in_tag && *c == '=' )
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{
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if( ( attr_descr = x509_attr_descr_from_name( s, c - s ) ) == NULL )
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{
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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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{
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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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{
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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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else if( !in_tag && ( *c == ',' || c == end ) )
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{
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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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{
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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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s = c + 1;
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in_tag = 1;
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}
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if( !in_tag && s != c + 1 )
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{
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*(d++) = *c;
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if( d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE )
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{
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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( ( cur = mbedtls_asn1_store_named_data( head, oid, oid_len,
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NULL, val_len + 1 ) ) == NULL )
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{
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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, unsigned char *start, 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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{
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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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{
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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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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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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*--(*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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MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( p, start, oid,
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oid_len, 0 ) );
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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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{
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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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{
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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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