Simon Cooksey
Pinned to some recent date
Diff: features/mbedtls/src/x509_create.c
- Revision:
- 0:fb7af294d5d9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/features/mbedtls/src/x509_create.c Thu Nov 17 16:43:53 2016 +0000
@@ -0,0 +1,340 @@
+/*
+ * X.509 base functions for creating certificates / CSRs
+ *
+ * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * This file is part of mbed TLS (https://tls.mbed.org)
+ */
+
+#if !defined(MBEDTLS_CONFIG_FILE)
+#include "mbedtls/config.h"
+#else
+#include MBEDTLS_CONFIG_FILE
+#endif
+
+#if defined(MBEDTLS_X509_CREATE_C)
+
+#include "mbedtls/x509.h"
+#include "mbedtls/asn1write.h"
+#include "mbedtls/oid.h"
+
+#include <string.h>
+
+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" ), MBEDTLS_OID_AT_CN },
+ { ADD_STRLEN( "commonName" ), MBEDTLS_OID_AT_CN },
+ { ADD_STRLEN( "C" ), MBEDTLS_OID_AT_COUNTRY },
+ { ADD_STRLEN( "countryName" ), MBEDTLS_OID_AT_COUNTRY },
+ { ADD_STRLEN( "O" ), MBEDTLS_OID_AT_ORGANIZATION },
+ { ADD_STRLEN( "organizationName" ), MBEDTLS_OID_AT_ORGANIZATION },
+ { ADD_STRLEN( "L" ), MBEDTLS_OID_AT_LOCALITY },
+ { ADD_STRLEN( "locality" ), MBEDTLS_OID_AT_LOCALITY },
+ { ADD_STRLEN( "R" ), MBEDTLS_OID_PKCS9_EMAIL },
+ { ADD_STRLEN( "OU" ), MBEDTLS_OID_AT_ORG_UNIT },
+ { ADD_STRLEN( "organizationalUnitName" ), MBEDTLS_OID_AT_ORG_UNIT },
+ { ADD_STRLEN( "ST" ), MBEDTLS_OID_AT_STATE },
+ { ADD_STRLEN( "stateOrProvinceName" ), MBEDTLS_OID_AT_STATE },
+ { ADD_STRLEN( "emailAddress" ), MBEDTLS_OID_PKCS9_EMAIL },
+ { ADD_STRLEN( "serialNumber" ), MBEDTLS_OID_AT_SERIAL_NUMBER },
+ { ADD_STRLEN( "postalAddress" ), MBEDTLS_OID_AT_POSTAL_ADDRESS },
+ { ADD_STRLEN( "postalCode" ), MBEDTLS_OID_AT_POSTAL_CODE },
+ { ADD_STRLEN( "dnQualifier" ), MBEDTLS_OID_AT_DN_QUALIFIER },
+ { ADD_STRLEN( "title" ), MBEDTLS_OID_AT_TITLE },
+ { ADD_STRLEN( "surName" ), MBEDTLS_OID_AT_SUR_NAME },
+ { ADD_STRLEN( "SN" ), MBEDTLS_OID_AT_SUR_NAME },
+ { ADD_STRLEN( "givenName" ), MBEDTLS_OID_AT_GIVEN_NAME },
+ { ADD_STRLEN( "GN" ), MBEDTLS_OID_AT_GIVEN_NAME },
+ { ADD_STRLEN( "initials" ), MBEDTLS_OID_AT_INITIALS },
+ { ADD_STRLEN( "pseudonym" ), MBEDTLS_OID_AT_PSEUDONYM },
+ { ADD_STRLEN( "generationQualifier" ), MBEDTLS_OID_AT_GENERATION_QUALIFIER },
+ { ADD_STRLEN( "domainComponent" ), MBEDTLS_OID_DOMAIN_COMPONENT },
+ { ADD_STRLEN( "DC" ), MBEDTLS_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 &&
+ strncmp( cur->name, name, name_len ) == 0 )
+ break;
+
+ return( cur->oid );
+}
+
+int mbedtls_x509_string_to_names( mbedtls_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[MBEDTLS_X509_MAX_DN_NAME_SIZE];
+ char *d = data;
+
+ /* Clear existing chain if present */
+ mbedtls_asn1_free_named_data_list( head );
+
+ while( c <= end )
+ {
+ if( in_tag && *c == '=' )
+ {
+ if( ( oid = x509_at_oid_from_name( s, c - s ) ) == NULL )
+ {
+ ret = MBEDTLS_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 = MBEDTLS_ERR_X509_INVALID_NAME;
+ goto exit;
+ }
+ }
+ else if( !in_tag && ( *c == ',' || c == end ) )
+ {
+ if( mbedtls_asn1_store_named_data( head, oid, strlen( oid ),
+ (unsigned char *) data,
+ d - data ) == NULL )
+ {
+ return( MBEDTLS_ERR_X509_ALLOC_FAILED );
+ }
+
+ while( c < end && *(c + 1) == ' ' )
+ c++;
+
+ s = c + 1;
+ in_tag = 1;
+ }
+
+ if( !in_tag && s != c + 1 )
+ {
+ *(d++) = *c;
+
+ if( d - data == MBEDTLS_X509_MAX_DN_NAME_SIZE )
+ {
+ ret = MBEDTLS_ERR_X509_INVALID_NAME;
+ goto exit;
+ }
+ }
+
+ c++;
+ }
+
+exit:
+
+ return( ret );
+}
+
+/* The first byte of the value in the mbedtls_asn1_named_data structure is reserved
+ * to store the critical boolean for us
+ */
+int mbedtls_x509_set_extension( mbedtls_asn1_named_data **head, const char *oid, size_t oid_len,
+ int critical, const unsigned char *val, size_t val_len )
+{
+ mbedtls_asn1_named_data *cur;
+
+ if( ( cur = mbedtls_asn1_store_named_data( head, oid, oid_len,
+ NULL, val_len + 1 ) ) == NULL )
+ {
+ return( MBEDTLS_ERR_X509_ALLOC_FAILED );
+ }
+
+ cur->val.p[0] = critical;
+ memcpy( cur->val.p + 1, val, val_len );
+
+ return( 0 );
+}
+
+/*
+ * RelativeDistinguishedName ::=
+ * SET OF AttributeTypeAndValue
+ *
+ * AttributeTypeAndValue ::= SEQUENCE {
+ * type AttributeType,
+ * value AttributeValue }
+ *
+ * AttributeType ::= OBJECT IDENTIFIER
+ *
+ * AttributeValue ::= ANY DEFINED BY AttributeType
+ */
+static int x509_write_name( unsigned char **p, unsigned char *start,
+ 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 MBEDTLS_OID_PKCS9_EMAIL
+ //
+ if( MBEDTLS_OID_SIZE( MBEDTLS_OID_PKCS9_EMAIL ) == oid_len &&
+ memcmp( oid, MBEDTLS_OID_PKCS9_EMAIL, oid_len ) == 0 )
+ {
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_ia5_string( p, start,
+ (const char *) name,
+ name_len ) );
+ }
+ else
+ {
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_printable_string( p, start,
+ (const char *) name,
+ name_len ) );
+ }
+
+ // Write OID
+ //
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_oid( p, start, oid, oid_len ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SET ) );
+
+ return( (int) len );
+}
+
+int mbedtls_x509_write_names( unsigned char **p, unsigned char *start,
+ mbedtls_asn1_named_data *first )
+{
+ int ret;
+ size_t len = 0;
+ mbedtls_asn1_named_data *cur = first;
+
+ while( cur != NULL )
+ {
+ MBEDTLS_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;
+ }
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+
+ return( (int) len );
+}
+
+int mbedtls_x509_write_sig( unsigned char **p, unsigned char *start,
+ const char *oid, size_t oid_len,
+ unsigned char *sig, size_t size )
+{
+ int ret;
+ size_t len = 0;
+
+ if( *p < start || (size_t)( *p - start ) < size )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ len = size;
+ (*p) -= len;
+ memcpy( *p, sig, len );
+
+ if( *p - start < 1 )
+ return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
+
+ *--(*p) = 0;
+ len += 1;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_BIT_STRING ) );
+
+ // Write OID
+ //
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_algorithm_identifier( p, start, oid,
+ oid_len, 0 ) );
+
+ return( (int) len );
+}
+
+static int x509_write_extension( unsigned char **p, unsigned char *start,
+ mbedtls_asn1_named_data *ext )
+{
+ int ret;
+ size_t len = 0;
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, ext->val.p + 1,
+ ext->val.len - 1 ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, ext->val.len - 1 ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OCTET_STRING ) );
+
+ if( ext->val.p[0] != 0 )
+ {
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_bool( p, start, 1 ) );
+ }
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_raw_buffer( p, start, ext->oid.p,
+ ext->oid.len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, ext->oid.len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_OID ) );
+
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
+ MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start, MBEDTLS_ASN1_CONSTRUCTED |
+ MBEDTLS_ASN1_SEQUENCE ) );
+
+ return( (int) len );
+}
+
+/*
+ * Extension ::= SEQUENCE {
+ * extnID OBJECT IDENTIFIER,
+ * critical BOOLEAN DEFAULT FALSE,
+ * extnValue OCTET STRING
+ * -- contains the DER encoding of an ASN.1 value
+ * -- corresponding to the extension type identified
+ * -- by extnID
+ * }
+ */
+int mbedtls_x509_write_extensions( unsigned char **p, unsigned char *start,
+ mbedtls_asn1_named_data *first )
+{
+ int ret;
+ size_t len = 0;
+ mbedtls_asn1_named_data *cur_ext = first;
+
+ while( cur_ext != NULL )
+ {
+ MBEDTLS_ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) );
+ cur_ext = cur_ext->next;
+ }
+
+ return( (int) len );
+}
+
+#endif /* MBEDTLS_X509_CREATE_C */