/* * X.509 base functions for creating certificates / CSRs * * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved * * This file is part of mbed TLS (https://tls.mbed.org) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. */ #if !defined(POLARSSL_CONFIG_FILE) #include "polarssl/config.h" #else #include POLARSSL_CONFIG_FILE #endif #if defined(POLARSSL_X509_CREATE_C) #include "polarssl/x509.h" #include "polarssl/asn1write.h" #include "polarssl/oid.h" #include #if defined(_MSC_VER) && !defined strncasecmp && !defined(EFIX64) && \ !defined(EFI32) #define strncasecmp _strnicmp #endif typedef struct { const char *name; size_t name_len; const char*oid; } x509_attr_descriptor_t; #define ADD_STRLEN( s ) s, sizeof( s ) - 1 static const x509_attr_descriptor_t x509_attrs[] = { { ADD_STRLEN( "CN" ), OID_AT_CN }, { ADD_STRLEN( "commonName" ), OID_AT_CN }, { ADD_STRLEN( "C" ), OID_AT_COUNTRY }, { ADD_STRLEN( "countryName" ), OID_AT_COUNTRY }, { ADD_STRLEN( "O" ), OID_AT_ORGANIZATION }, { ADD_STRLEN( "organizationName" ), OID_AT_ORGANIZATION }, { ADD_STRLEN( "L" ), OID_AT_LOCALITY }, { ADD_STRLEN( "locality" ), OID_AT_LOCALITY }, { ADD_STRLEN( "R" ), OID_PKCS9_EMAIL }, { ADD_STRLEN( "OU" ), OID_AT_ORG_UNIT }, { ADD_STRLEN( "organizationalUnitName" ), OID_AT_ORG_UNIT }, { ADD_STRLEN( "ST" ), OID_AT_STATE }, { ADD_STRLEN( "stateOrProvinceName" ), OID_AT_STATE }, { ADD_STRLEN( "emailAddress" ), OID_PKCS9_EMAIL }, { ADD_STRLEN( "serialNumber" ), OID_AT_SERIAL_NUMBER }, { ADD_STRLEN( "postalAddress" ), OID_AT_POSTAL_ADDRESS }, { ADD_STRLEN( "postalCode" ), OID_AT_POSTAL_CODE }, { ADD_STRLEN( "dnQualifier" ), OID_AT_DN_QUALIFIER }, { ADD_STRLEN( "title" ), OID_AT_TITLE }, { ADD_STRLEN( "surName" ), OID_AT_SUR_NAME }, { ADD_STRLEN( "SN" ), OID_AT_SUR_NAME }, { ADD_STRLEN( "givenName" ), OID_AT_GIVEN_NAME }, { ADD_STRLEN( "GN" ), OID_AT_GIVEN_NAME }, { ADD_STRLEN( "initials" ), OID_AT_INITIALS }, { ADD_STRLEN( "pseudonym" ), OID_AT_PSEUDONYM }, { ADD_STRLEN( "generationQualifier" ), OID_AT_GENERATION_QUALIFIER }, { ADD_STRLEN( "domainComponent" ), OID_DOMAIN_COMPONENT }, { ADD_STRLEN( "DC" ), OID_DOMAIN_COMPONENT }, { NULL, 0, NULL } }; static const char *x509_at_oid_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 && strncasecmp( cur->name, name, name_len ) == 0 ) break; return( cur->oid ); } int x509_string_to_names( asn1_named_data **head, const char *name ) { int ret = 0; const char *s = name, *c = s; const char *end = s + strlen( s ); const char *oid = NULL; int in_tag = 1; char data[X509_MAX_DN_NAME_SIZE]; char *d = data; /* Clear existing chain if present */ asn1_free_named_data_list( head ); while( c <= end ) { if( in_tag && *c == '=' ) { if( ( oid = x509_at_oid_from_name( s, c - s ) ) == NULL ) { ret = POLARSSL_ERR_X509_UNKNOWN_OID; goto exit; } 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 = POLARSSL_ERR_X509_INVALID_NAME; goto exit; } } else if( !in_tag && ( *c == ',' || c == end ) ) { if( asn1_store_named_data( head, oid, strlen( oid ), (unsigned char *) data, d - data ) == NULL ) { return( POLARSSL_ERR_X509_MALLOC_FAILED ); } while( c < end && *(c + 1) == ' ' ) c++; s = c + 1; in_tag = 1; } if( !in_tag && s != c + 1 ) { *(d++) = *c; if( d - data == X509_MAX_DN_NAME_SIZE ) { ret = POLARSSL_ERR_X509_INVALID_NAME; goto exit; } } c++; } exit: return( ret ); } /* The first byte of the value in the asn1_named_data structure is reserved * to store the critical boolean for us */ int x509_set_extension( asn1_named_data **head, const char *oid, size_t oid_len, int critical, const unsigned char *val, size_t val_len ) { asn1_named_data *cur; if( ( cur = asn1_store_named_data( head, oid, oid_len, NULL, val_len + 1 ) ) == NULL ) { return( POLARSSL_ERR_X509_MALLOC_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, const char *oid, size_t oid_len, const unsigned char *name, size_t name_len ) { int ret; size_t len = 0; // Write PrintableString for all except OID_PKCS9_EMAIL // if( OID_SIZE( OID_PKCS9_EMAIL ) == oid_len && memcmp( oid, OID_PKCS9_EMAIL, oid_len ) == 0 ) { ASN1_CHK_ADD( len, asn1_write_ia5_string( p, start, (const char *) name, name_len ) ); } else { ASN1_CHK_ADD( len, asn1_write_printable_string( p, start, (const char *) name, name_len ) ); } // Write OID // ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) ); ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ); ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) ); return( (int) len ); } int x509_write_names( unsigned char **p, unsigned char *start, asn1_named_data *first ) { int ret; size_t len = 0; asn1_named_data *cur = first; while( cur != NULL ) { ASN1_CHK_ADD( len, x509_write_name( p, start, (char *) cur->oid.p, cur->oid.len, cur->val.p, cur->val.len ) ); cur = cur->next; } ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SEQUENCE ) ); return( (int) len ); } int x509_write_sig( unsigned char **p, unsigned char *start, const char *oid, size_t oid_len, unsigned char *sig, size_t size ) { int ret; size_t len = 0; if( *p - start < (int) size + 1 ) return( POLARSSL_ERR_ASN1_BUF_TOO_SMALL ); len = size; (*p) -= len; memcpy( *p, sig, len ); *--(*p) = 0; len += 1; ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) ); // Write OID // ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid, oid_len, 0 ) ); return( (int) len ); } static int x509_write_extension( unsigned char **p, unsigned char *start, asn1_named_data *ext ) { int ret; size_t len = 0; ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->val.p + 1, ext->val.len - 1 ) ); ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->val.len - 1 ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OCTET_STRING ) ); if( ext->val.p[0] != 0 ) { ASN1_CHK_ADD( len, asn1_write_bool( p, start, 1 ) ); } ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->oid.p, ext->oid.len ) ); ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->oid.len ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OID ) ); ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) ); ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | 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 x509_write_extensions( unsigned char **p, unsigned char *start, asn1_named_data *first ) { int ret; size_t len = 0; asn1_named_data *cur_ext = first; while( cur_ext != NULL ) { ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) ); cur_ext = cur_ext->next; } return( (int) len ); } #endif /* POLARSSL_X509_CREATE_C */