PolarSSL v1.3.1
x509_create.c
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1 /*
2  * X.509 base functions for creating certificates / CSRs
3  *
4  * Copyright (C) 2006-2013, Brainspark B.V.
5  *
6  * This file is part of PolarSSL (http://www.polarssl.org)
7  * Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
8  *
9  * All rights reserved.
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2 of the License, or
14  * (at your option) any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License along
22  * with this program; if not, write to the Free Software Foundation, Inc.,
23  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24  */
25 
26 #include "polarssl/config.h"
27 
28 #if defined(POLARSSL_X509_CREATE_C)
29 
30 #include "polarssl/x509.h"
31 #include "polarssl/asn1write.h"
32 #include "polarssl/oid.h"
33 
34 int x509_string_to_names( asn1_named_data **head, char *name )
35 {
36  int ret = 0;
37  char *s = name, *c = s;
38  char *end = s + strlen( s );
39  const char *oid = NULL;
40  int in_tag = 1;
41  asn1_named_data *cur;
42 
43  /* Clear existing chain if present */
45 
46  while( c <= end )
47  {
48  if( in_tag && *c == '=' )
49  {
50  if( memcmp( s, "CN", 2 ) == 0 && c - s == 2 )
51  oid = OID_AT_CN;
52  else if( memcmp( s, "C", 1 ) == 0 && c - s == 1 )
53  oid = OID_AT_COUNTRY;
54  else if( memcmp( s, "O", 1 ) == 0 && c - s == 1 )
55  oid = OID_AT_ORGANIZATION;
56  else if( memcmp( s, "L", 1 ) == 0 && c - s == 1 )
57  oid = OID_AT_LOCALITY;
58  else if( memcmp( s, "R", 1 ) == 0 && c - s == 1 )
59  oid = OID_PKCS9_EMAIL;
60  else if( memcmp( s, "OU", 2 ) == 0 && c - s == 2 )
61  oid = OID_AT_ORG_UNIT;
62  else if( memcmp( s, "ST", 2 ) == 0 && c - s == 2 )
63  oid = OID_AT_STATE;
64  else
65  {
67  goto exit;
68  }
69 
70  s = c + 1;
71  in_tag = 0;
72  }
73 
74  if( !in_tag && ( *c == ',' || c == end ) )
75  {
76  if( ( cur = asn1_store_named_data( head, oid, strlen( oid ),
77  (unsigned char *) s,
78  c - s ) ) == NULL )
79  {
81  }
82 
83  while( c < end && *(c + 1) == ' ' )
84  c++;
85 
86  s = c + 1;
87  in_tag = 1;
88  }
89  c++;
90  }
91 
92 exit:
93 
94  return( ret );
95 }
96 
97 /* The first byte of the value in the asn1_named_data structure is reserved
98  * to store the critical boolean for us
99  */
100 int x509_set_extension( asn1_named_data **head, const char *oid, size_t oid_len,
101  int critical, const unsigned char *val, size_t val_len )
102 {
103  asn1_named_data *cur;
104 
105  if( ( cur = asn1_store_named_data( head, oid, oid_len,
106  NULL, val_len + 1 ) ) == NULL )
107  {
109  }
110 
111  cur->val.p[0] = critical;
112  memcpy( cur->val.p + 1, val, val_len );
113 
114  return( 0 );
115 }
116 
117 /*
118  * RelativeDistinguishedName ::=
119  * SET OF AttributeTypeAndValue
120  *
121  * AttributeTypeAndValue ::= SEQUENCE {
122  * type AttributeType,
123  * value AttributeValue }
124  *
125  * AttributeType ::= OBJECT IDENTIFIER
126  *
127  * AttributeValue ::= ANY DEFINED BY AttributeType
128  */
129 static int x509_write_name( unsigned char **p, unsigned char *start,
130  const char *oid, size_t oid_len,
131  const unsigned char *name, size_t name_len )
132 {
133  int ret;
134  size_t len = 0;
135 
136  // Write PrintableString for all except OID_PKCS9_EMAIL
137  //
138  if( OID_SIZE( OID_PKCS9_EMAIL ) == oid_len &&
139  memcmp( oid, OID_PKCS9_EMAIL, oid_len ) == 0 )
140  {
141  ASN1_CHK_ADD( len, asn1_write_ia5_string( p, start,
142  (const char *) name,
143  name_len ) );
144  }
145  else
146  {
148  (const char *) name,
149  name_len ) );
150  }
151 
152  // Write OID
153  //
154  ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) );
155 
156  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
158 
159  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
160  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) );
161 
162  return( (int) len );
163 }
164 
165 int x509_write_names( unsigned char **p, unsigned char *start,
166  asn1_named_data *first )
167 {
168  int ret;
169  size_t len = 0;
170  asn1_named_data *cur = first;
171 
172  while( cur != NULL )
173  {
174  ASN1_CHK_ADD( len, x509_write_name( p, start, (char *) cur->oid.p,
175  cur->oid.len,
176  cur->val.p, cur->val.len ) );
177  cur = cur->next;
178  }
179 
180  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
182 
183  return( (int) len );
184 }
185 
186 int x509_write_sig( unsigned char **p, unsigned char *start,
187  const char *oid, size_t oid_len,
188  unsigned char *sig, size_t size )
189 {
190  int ret;
191  size_t len = 0;
192 
193  if( *p - start < (int) size + 1 )
195 
196  len = size;
197  (*p) -= len;
198  memcpy( *p, sig, len );
199 
200  *--(*p) = 0;
201  len += 1;
202 
203  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
204  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );
205 
206  // Write OID
207  //
208  ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid,
209  oid_len, 0 ) );
210 
211  return( (int) len );
212 }
213 
214 static int x509_write_extension( unsigned char **p, unsigned char *start,
215  asn1_named_data *ext )
216 {
217  int ret;
218  size_t len = 0;
219 
220  ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->val.p + 1,
221  ext->val.len - 1 ) );
222  ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->val.len - 1 ) );
223  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OCTET_STRING ) );
224 
225  if( ext->val.p[0] != 0 )
226  {
227  ASN1_CHK_ADD( len, asn1_write_bool( p, start, 1 ) );
228  }
229 
230  ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->oid.p,
231  ext->oid.len ) );
232  ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->oid.len ) );
233  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OID ) );
234 
235  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
237 
238  return( (int) len );
239 }
240 
241 /*
242  * Extension ::= SEQUENCE {
243  * extnID OBJECT IDENTIFIER,
244  * critical BOOLEAN DEFAULT FALSE,
245  * extnValue OCTET STRING
246  * -- contains the DER encoding of an ASN.1 value
247  * -- corresponding to the extension type identified
248  * -- by extnID
249  * }
250  */
251 int x509_write_extensions( unsigned char **p, unsigned char *start,
252  asn1_named_data *first )
253 {
254  int ret;
255  size_t len = 0;
256  asn1_named_data *cur_ext = first;
257 
258  while( cur_ext != NULL )
259  {
260  ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) );
261  cur_ext = cur_ext->next;
262  }
263 
264  return( (int) len );
265 }
266 
267 #endif /* POLARSSL_X509_CREATE_C */