[398] | 1 | /*
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| 2 | * X.509 base functions for creating certificates / CSRs
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 |
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| 22 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 23 | #include "mbedtls/config.h"
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| 24 | #else
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| 25 | #include MBEDTLS_CONFIG_FILE
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| 26 | #endif
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| 27 |
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| 28 | #if defined(MBEDTLS_X509_CREATE_C)
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| 29 |
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| 30 | #include "mbedtls/x509.h"
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| 31 | #include "mbedtls/asn1write.h"
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| 32 | #include "mbedtls/oid.h"
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| 33 |
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| 34 | #include <string.h>
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| 35 |
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| 36 | /* Structure linking OIDs for X.509 DN AttributeTypes to their
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| 37 | * string representations and default string encodings used by Mbed TLS. */
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| 38 | typedef struct {
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| 39 | const char *name; /* String representation of AttributeType, e.g.
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| 40 | * "CN" or "emailAddress". */
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| 41 | size_t name_len; /* Length of 'name', without trailing 0 byte. */
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| 42 | const char *oid; /* String representation of OID of AttributeType,
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| 43 | * as per RFC 5280, Appendix A.1. */
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| 44 | int default_tag; /* The default character encoding used for the
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| 45 | * given attribute type, e.g.
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| 46 | * MBEDTLS_ASN1_UTF8_STRING for UTF-8. */
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| 47 | } x509_attr_descriptor_t;
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| 48 |
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| 49 | #define ADD_STRLEN( s ) s, sizeof( s ) - 1
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| 50 |
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| 51 | /* X.509 DN attributes from RFC 5280, Appendix A.1. */
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| 52 | static const x509_attr_descriptor_t x509_attrs[] =
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| 53 | {
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| 54 | { ADD_STRLEN( "CN" ),
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| 55 | MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING },
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| 56 | { ADD_STRLEN( "commonName" ),
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| 57 | MBEDTLS_OID_AT_CN, MBEDTLS_ASN1_UTF8_STRING },
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| 58 | { ADD_STRLEN( "C" ),
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| 59 | MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING },
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| 60 | { ADD_STRLEN( "countryName" ),
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| 61 | MBEDTLS_OID_AT_COUNTRY, MBEDTLS_ASN1_PRINTABLE_STRING },
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| 62 | { ADD_STRLEN( "O" ),
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| 63 | MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING },
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| 64 | { ADD_STRLEN( "organizationName" ),
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| 65 | MBEDTLS_OID_AT_ORGANIZATION, MBEDTLS_ASN1_UTF8_STRING },
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| 66 | { ADD_STRLEN( "L" ),
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| 67 | MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING },
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| 68 | { ADD_STRLEN( "locality" ),
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| 69 | MBEDTLS_OID_AT_LOCALITY, MBEDTLS_ASN1_UTF8_STRING },
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| 70 | { ADD_STRLEN( "R" ),
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| 71 | MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING },
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| 72 | { ADD_STRLEN( "OU" ),
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| 73 | MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING },
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| 74 | { ADD_STRLEN( "organizationalUnitName" ),
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| 75 | MBEDTLS_OID_AT_ORG_UNIT, MBEDTLS_ASN1_UTF8_STRING },
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| 76 | { ADD_STRLEN( "ST" ),
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| 77 | MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING },
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| 78 | { ADD_STRLEN( "stateOrProvinceName" ),
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| 79 | MBEDTLS_OID_AT_STATE, MBEDTLS_ASN1_UTF8_STRING },
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| 80 | { ADD_STRLEN( "emailAddress" ),
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| 81 | MBEDTLS_OID_PKCS9_EMAIL, MBEDTLS_ASN1_IA5_STRING },
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| 82 | { ADD_STRLEN( "serialNumber" ),
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| 83 | MBEDTLS_OID_AT_SERIAL_NUMBER, MBEDTLS_ASN1_PRINTABLE_STRING },
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| 84 | { ADD_STRLEN( "postalAddress" ),
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| 85 | MBEDTLS_OID_AT_POSTAL_ADDRESS, MBEDTLS_ASN1_PRINTABLE_STRING },
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| 86 | { ADD_STRLEN( "postalCode" ),
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| 87 | MBEDTLS_OID_AT_POSTAL_CODE, MBEDTLS_ASN1_PRINTABLE_STRING },
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| 88 | { ADD_STRLEN( "dnQualifier" ),
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| 89 | MBEDTLS_OID_AT_DN_QUALIFIER, MBEDTLS_ASN1_PRINTABLE_STRING },
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| 90 | { ADD_STRLEN( "title" ),
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| 91 | MBEDTLS_OID_AT_TITLE, MBEDTLS_ASN1_UTF8_STRING },
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| 92 | { ADD_STRLEN( "surName" ),
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| 93 | MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING },
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| 94 | { ADD_STRLEN( "SN" ),
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| 95 | MBEDTLS_OID_AT_SUR_NAME, MBEDTLS_ASN1_UTF8_STRING },
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| 96 | { ADD_STRLEN( "givenName" ),
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| 97 | MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING },
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| 98 | { ADD_STRLEN( "GN" ),
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| 99 | MBEDTLS_OID_AT_GIVEN_NAME, MBEDTLS_ASN1_UTF8_STRING },
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| 100 | { ADD_STRLEN( "initials" ),
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| 101 | MBEDTLS_OID_AT_INITIALS, MBEDTLS_ASN1_UTF8_STRING },
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| 102 | { ADD_STRLEN( "pseudonym" ),
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| 103 | MBEDTLS_OID_AT_PSEUDONYM, MBEDTLS_ASN1_UTF8_STRING },
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| 104 | { ADD_STRLEN( "generationQualifier" ),
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| 105 | MBEDTLS_OID_AT_GENERATION_QUALIFIER, MBEDTLS_ASN1_UTF8_STRING },
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| 106 | { ADD_STRLEN( "domainComponent" ),
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| 107 | MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING },
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| 108 | { ADD_STRLEN( "DC" ),
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| 109 | MBEDTLS_OID_DOMAIN_COMPONENT, MBEDTLS_ASN1_IA5_STRING },
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| 110 | { NULL, 0, NULL, MBEDTLS_ASN1_NULL }
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| 111 | };
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| 112 |
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| 113 | static const x509_attr_descriptor_t *x509_attr_descr_from_name( const char *name, size_t name_len )
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| 114 | {
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| 115 | const x509_attr_descriptor_t *cur;
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| 116 |
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| 117 | for( cur = x509_attrs; cur->name != NULL; cur++ )
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| 118 | if( cur->name_len == name_len &&
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| 119 | strncmp( cur->name, name, name_len ) == 0 )
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| 120 | break;
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| 121 |
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| 122 | if ( cur->name == NULL )
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| 123 | return( NULL );
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| 124 |
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| 125 | return( cur );
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| 126 | }
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| 127 |
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| 128 | int mbedtls_x509_string_to_names( mbedtls_asn1_named_data **head, const char *name )
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| 129 | {
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| 130 | int ret = 0;
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| 131 | const char *s = name, *c = s;
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| 132 | const char *end = s + strlen( s );
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| 133 | const char *oid = NULL;
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| 134 | const x509_attr_descriptor_t* attr_descr = NULL;
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| 135 | int in_tag = 1;
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| 136 | char data[MBEDTLS_X509_MAX_DN_NAME_SIZE];
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| 137 | char *d = data;
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| 138 |
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| 139 | /* Clear existing chain if present */
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| 140 | mbedtls_asn1_free_named_data_list( head );
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| 141 |
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| 142 | while( c <= end )
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| 143 | {
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| 144 | if( in_tag && *c == '=' )
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| 145 | {
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| 146 | if( ( attr_descr = x509_attr_descr_from_name( s, c - s ) ) == NULL )
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| 147 | {
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| 148 | ret = MBEDTLS_ERR_X509_UNKNOWN_OID;
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| 149 | goto exit;
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| 150 | }
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| 151 |
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| 152 | oid = attr_descr->oid;
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| 153 | s = c + 1;
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| 154 | in_tag = 0;
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| 155 | d = data;
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| 156 | }
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| 157 |
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| 158 | if( !in_tag && *c == '\\' && c != end )
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| 159 | {
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| 160 | c++;
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| 161 |
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| 162 | /* Check for valid escaped characters */
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| 163 | if( c == end || *c != ',' )
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| 164 | {
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| 165 | ret = MBEDTLS_ERR_X509_INVALID_NAME;
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| 166 | goto exit;
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| 167 | }
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| 168 | }
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| 169 | else if( !in_tag && ( *c == ',' || c == end ) )
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| 170 | {
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| 171 | mbedtls_asn1_named_data* cur =
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| 172 | mbedtls_asn1_store_named_data( head, oid, strlen( oid ),
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| 173 | (unsigned char *) data,
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| 174 | d - data );
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| 175 |
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| 176 | if(cur == NULL )
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| 177 | {
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| 178 | return( MBEDTLS_ERR_X509_ALLOC_FAILED );
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| 179 | }
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| 180 |
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| 181 | // set tagType
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| 182 | cur->val.tag = attr_descr->default_tag;
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| 183 |
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| 184 | while( c < end && *(c + 1) == ' ' )
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| 185 | c++;
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| 186 |
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| 187 | s = c + 1;
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| 188 | in_tag = 1;
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| 189 | }
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| 190 |
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| 191 | if( !in_tag && s != c + 1 )
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| 192 | {
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| 193 | *(d++) = *c;
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| 194 |
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| 195 | if( d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE )
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| 196 | {
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| 197 | ret = MBEDTLS_ERR_X509_INVALID_NAME;
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| 198 | goto exit;
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| 199 | }
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| 200 | }
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| 201 |
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| 202 | c++;
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| 203 | }
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| 204 |
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| 205 | exit:
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| 206 |
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| 207 | return( ret );
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| 208 | }
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| 209 |
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| 210 | /* The first byte of the value in the mbedtls_asn1_named_data structure is reserved
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| 211 | * to store the critical boolean for us
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| 212 | */
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| 213 | int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
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| 214 | int critical, const unsigned char *val, size_t val_len )
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| 215 | {
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| 216 | mbedtls_asn1_named_data *cur;
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| 217 |
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| 218 | if( ( cur = mbedtls_asn1_store_named_data( head, oid, oid_len,
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| 219 | NULL, val_len + 1 ) ) == NULL )
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| 220 | {
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| 221 | return( MBEDTLS_ERR_X509_ALLOC_FAILED );
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| 222 | }
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| 223 |
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| 224 | cur->val.p[0] = critical;
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| 225 | memcpy( cur->val.p + 1, val, val_len );
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| 226 |
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| 227 | return( 0 );
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| 228 | }
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| 229 |
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| 230 | /*
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| 231 | * RelativeDistinguishedName ::=
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| 232 | * SET OF AttributeTypeAndValue
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| 233 | *
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| 234 | * AttributeTypeAndValue ::= SEQUENCE {
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| 235 | * type AttributeType,
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| 236 | * value AttributeValue }
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| 237 | *
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| 238 | * AttributeType ::= OBJECT IDENTIFIER
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| 239 | *
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| 240 | * AttributeValue ::= ANY DEFINED BY AttributeType
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| 241 | */
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| 242 | static int x509_write_name( unsigned char **p, unsigned char *start, mbedtls_asn1_named_data* cur_name)
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| 243 | {
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| 244 | int ret;
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| 245 | size_t len = 0;
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| 246 | const char *oid = (const char*)cur_name->oid.p;
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| 247 | size_t oid_len = cur_name->oid.len;
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| 248 | const unsigned char *name = cur_name->val.p;
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| 249 | size_t name_len = cur_name->val.len;
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| 250 |
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| 251 | // Write correct string tag and value
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| 252 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tagged_string( p, start,
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| 253 | cur_name->val.tag,
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| 254 | (const char *) name,
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| 255 | name_len ) );
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| 256 | // Write OID
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| 257 | //
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| 258 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid,
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| 259 | oid_len ) );
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| 260 |
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| 261 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 262 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
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| 263 | MBEDTLS_ASN1_CONSTRUCTED |
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| 264 | MBEDTLS_ASN1_SEQUENCE ) );
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| 265 |
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| 266 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 267 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
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| 268 | MBEDTLS_ASN1_CONSTRUCTED |
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| 269 | MBEDTLS_ASN1_SET ) );
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| 270 |
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| 271 | return( (int) len );
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| 272 | }
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| 273 |
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| 274 | int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
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| 275 | mbedtls_asn1_named_data *first )
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| 276 | {
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| 277 | int ret;
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| 278 | size_t len = 0;
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| 279 | mbedtls_asn1_named_data *cur = first;
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| 280 |
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| 281 | while( cur != NULL )
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| 282 | {
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| 283 | MBEDTLS_ASN1_CHK_ADD( len, x509_write_name( p, start, cur ) );
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| 284 | cur = cur->next;
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| 285 | }
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| 286 |
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| 287 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 288 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
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| 289 | MBEDTLS_ASN1_SEQUENCE ) );
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| 290 |
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| 291 | return( (int) len );
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| 292 | }
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| 293 |
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| 294 | int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
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| 295 | const char *oid, size_t oid_len,
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| 296 | unsigned char *sig, size_t size )
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| 297 | {
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| 298 | int ret;
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| 299 | size_t len = 0;
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| 300 |
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| 301 | if( *p < start || (size_t)( *p - start ) < size )
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| 302 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 303 |
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| 304 | len = size;
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| 305 | (*p) -= len;
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| 306 | memcpy( *p, sig, len );
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| 307 |
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| 308 | if( *p - start < 1 )
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| 309 | return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
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| 310 |
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| 311 | *--(*p) = 0;
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| 312 | len += 1;
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| 313 |
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| 314 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 315 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BIT_STRING ) );
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| 316 |
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| 317 | // Write OID
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| 318 | //
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| 319 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( p, start, oid,
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| 320 | oid_len, 0 ) );
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| 321 |
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| 322 | return( (int) len );
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| 323 | }
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| 324 |
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| 325 | static int x509_write_extension( unsigned char **p, unsigned char *start,
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| 326 | mbedtls_asn1_named_data *ext )
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| 327 | {
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| 328 | int ret;
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| 329 | size_t len = 0;
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| 330 |
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| 331 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, ext->val.p + 1,
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| 332 | ext->val.len - 1 ) );
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| 333 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, ext->val.len - 1 ) );
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| 334 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OCTET_STRING ) );
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| 335 |
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| 336 | if( ext->val.p[0] != 0 )
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| 337 | {
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| 338 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( p, start, 1 ) );
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| 339 | }
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| 340 |
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| 341 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, ext->oid.p,
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| 342 | ext->oid.len ) );
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| 343 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, ext->oid.len ) );
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| 344 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OID ) );
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| 345 |
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| 346 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
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| 347 | MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
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| 348 | MBEDTLS_ASN1_SEQUENCE ) );
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| 349 |
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| 350 | return( (int) len );
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| 351 | }
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| 352 |
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| 353 | /*
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| 354 | * Extension ::= SEQUENCE {
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| 355 | * extnID OBJECT IDENTIFIER,
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| 356 | * critical BOOLEAN DEFAULT FALSE,
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| 357 | * extnValue OCTET STRING
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| 358 | * -- contains the DER encoding of an ASN.1 value
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| 359 | * -- corresponding to the extension type identified
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| 360 | * -- by extnID
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| 361 | * }
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| 362 | */
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| 363 | int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
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| 364 | mbedtls_asn1_named_data *first )
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| 365 | {
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| 366 | int ret;
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| 367 | size_t len = 0;
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| 368 | mbedtls_asn1_named_data *cur_ext = first;
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| 369 |
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| 370 | while( cur_ext != NULL )
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| 371 | {
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| 372 | MBEDTLS_ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) );
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| 373 | cur_ext = cur_ext->next;
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| 374 | }
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| 375 |
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| 376 | return( (int) len );
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| 377 | }
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| 378 |
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| 379 | #endif /* MBEDTLS_X509_CREATE_C */
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