PolarSSL v1.3.4
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 #if defined(_MSC_VER) && !defined strncasecmp && !defined(EFIX64) && \
35  !defined(EFI32)
36 #define strncasecmp _strnicmp
37 #endif
38 
39 int x509_string_to_names( asn1_named_data **head, const char *name )
40 {
41  int ret = 0;
42  const char *s = name, *c = s;
43  const char *end = s + strlen( s );
44  const char *oid = NULL;
45  int in_tag = 1;
46  asn1_named_data *cur;
47 
48  /* Clear existing chain if present */
50 
51  while( c <= end )
52  {
53  if( in_tag && *c == '=' )
54  {
55  if( c - s == 2 && strncasecmp( s, "CN", 2 ) == 0 )
56  oid = OID_AT_CN;
57  else if( c - s == 1 && strncasecmp( s, "C", 1 ) == 0 )
58  oid = OID_AT_COUNTRY;
59  else if( c - s == 1 && strncasecmp( s, "O", 1 ) == 0 )
60  oid = OID_AT_ORGANIZATION;
61  else if( c - s == 1 && strncasecmp( s, "L", 1 ) == 0 )
62  oid = OID_AT_LOCALITY;
63  else if( c - s == 1 && strncasecmp( s, "R", 1 ) == 0 )
64  oid = OID_PKCS9_EMAIL;
65  else if( c - s == 2 && strncasecmp( s, "OU", 2 ) == 0 )
66  oid = OID_AT_ORG_UNIT;
67  else if( c - s == 2 && strncasecmp( s, "ST", 2 ) == 0 )
68  oid = OID_AT_STATE;
69  else if( c - s == 12 && strncasecmp( s, "serialNumber", 12 ) == 0 )
71  else if( c - s == 13 && strncasecmp( s, "postalAddress", 13 ) == 0 )
73  else if( c - s == 10 && strncasecmp( s, "postalCode", 10 ) == 0 )
74  oid = OID_AT_POSTAL_CODE;
75  else
76  {
78  goto exit;
79  }
80 
81  s = c + 1;
82  in_tag = 0;
83  }
84 
85  if( !in_tag && ( *c == ',' || c == end ) )
86  {
87  if( ( cur = asn1_store_named_data( head, oid, strlen( oid ),
88  (unsigned char *) s,
89  c - s ) ) == NULL )
90  {
92  }
93 
94  while( c < end && *(c + 1) == ' ' )
95  c++;
96 
97  s = c + 1;
98  in_tag = 1;
99  }
100  c++;
101  }
102 
103 exit:
104 
105  return( ret );
106 }
107 
108 /* The first byte of the value in the asn1_named_data structure is reserved
109  * to store the critical boolean for us
110  */
111 int x509_set_extension( asn1_named_data **head, const char *oid, size_t oid_len,
112  int critical, const unsigned char *val, size_t val_len )
113 {
114  asn1_named_data *cur;
115 
116  if( ( cur = asn1_store_named_data( head, oid, oid_len,
117  NULL, val_len + 1 ) ) == NULL )
118  {
120  }
121 
122  cur->val.p[0] = critical;
123  memcpy( cur->val.p + 1, val, val_len );
124 
125  return( 0 );
126 }
127 
128 /*
129  * RelativeDistinguishedName ::=
130  * SET OF AttributeTypeAndValue
131  *
132  * AttributeTypeAndValue ::= SEQUENCE {
133  * type AttributeType,
134  * value AttributeValue }
135  *
136  * AttributeType ::= OBJECT IDENTIFIER
137  *
138  * AttributeValue ::= ANY DEFINED BY AttributeType
139  */
140 static int x509_write_name( unsigned char **p, unsigned char *start,
141  const char *oid, size_t oid_len,
142  const unsigned char *name, size_t name_len )
143 {
144  int ret;
145  size_t len = 0;
146 
147  // Write PrintableString for all except OID_PKCS9_EMAIL
148  //
149  if( OID_SIZE( OID_PKCS9_EMAIL ) == oid_len &&
150  memcmp( oid, OID_PKCS9_EMAIL, oid_len ) == 0 )
151  {
152  ASN1_CHK_ADD( len, asn1_write_ia5_string( p, start,
153  (const char *) name,
154  name_len ) );
155  }
156  else
157  {
159  (const char *) name,
160  name_len ) );
161  }
162 
163  // Write OID
164  //
165  ASN1_CHK_ADD( len, asn1_write_oid( p, start, oid, oid_len ) );
166 
167  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
169 
170  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
171  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_CONSTRUCTED | ASN1_SET ) );
172 
173  return( (int) len );
174 }
175 
176 int x509_write_names( unsigned char **p, unsigned char *start,
177  asn1_named_data *first )
178 {
179  int ret;
180  size_t len = 0;
181  asn1_named_data *cur = first;
182 
183  while( cur != NULL )
184  {
185  ASN1_CHK_ADD( len, x509_write_name( p, start, (char *) cur->oid.p,
186  cur->oid.len,
187  cur->val.p, cur->val.len ) );
188  cur = cur->next;
189  }
190 
191  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
193 
194  return( (int) len );
195 }
196 
197 int x509_write_sig( unsigned char **p, unsigned char *start,
198  const char *oid, size_t oid_len,
199  unsigned char *sig, size_t size )
200 {
201  int ret;
202  size_t len = 0;
203 
204  if( *p - start < (int) size + 1 )
206 
207  len = size;
208  (*p) -= len;
209  memcpy( *p, sig, len );
210 
211  *--(*p) = 0;
212  len += 1;
213 
214  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
215  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_BIT_STRING ) );
216 
217  // Write OID
218  //
219  ASN1_CHK_ADD( len, asn1_write_algorithm_identifier( p, start, oid,
220  oid_len, 0 ) );
221 
222  return( (int) len );
223 }
224 
225 static int x509_write_extension( unsigned char **p, unsigned char *start,
226  asn1_named_data *ext )
227 {
228  int ret;
229  size_t len = 0;
230 
231  ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->val.p + 1,
232  ext->val.len - 1 ) );
233  ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->val.len - 1 ) );
234  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OCTET_STRING ) );
235 
236  if( ext->val.p[0] != 0 )
237  {
238  ASN1_CHK_ADD( len, asn1_write_bool( p, start, 1 ) );
239  }
240 
241  ASN1_CHK_ADD( len, asn1_write_raw_buffer( p, start, ext->oid.p,
242  ext->oid.len ) );
243  ASN1_CHK_ADD( len, asn1_write_len( p, start, ext->oid.len ) );
244  ASN1_CHK_ADD( len, asn1_write_tag( p, start, ASN1_OID ) );
245 
246  ASN1_CHK_ADD( len, asn1_write_len( p, start, len ) );
248 
249  return( (int) len );
250 }
251 
252 /*
253  * Extension ::= SEQUENCE {
254  * extnID OBJECT IDENTIFIER,
255  * critical BOOLEAN DEFAULT FALSE,
256  * extnValue OCTET STRING
257  * -- contains the DER encoding of an ASN.1 value
258  * -- corresponding to the extension type identified
259  * -- by extnID
260  * }
261  */
262 int x509_write_extensions( unsigned char **p, unsigned char *start,
263  asn1_named_data *first )
264 {
265  int ret;
266  size_t len = 0;
267  asn1_named_data *cur_ext = first;
268 
269  while( cur_ext != NULL )
270  {
271  ASN1_CHK_ADD( len, x509_write_extension( p, start, cur_ext ) );
272  cur_ext = cur_ext->next;
273  }
274 
275  return( (int) len );
276 }
277 
278 #endif /* POLARSSL_X509_CREATE_C */
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)
int x509_string_to_names(asn1_named_data **head, const char *name)
#define ASN1_OID
Definition: asn1.h:76
int asn1_write_ia5_string(unsigned char **p, unsigned char *start, const char *text, size_t text_len)
Write an IA5 string tag (ASN1_IA5_STRING) and value in ASN.1 format Note: function works backwards in...
asn1_named_data * asn1_store_named_data(asn1_named_data **list, const char *oid, size_t oid_len, const unsigned char *val, size_t val_len)
Create or find a specific named_data entry for writing in a sequence or list based on the OID...
#define POLARSSL_ERR_ASN1_BUF_TOO_SMALL
Buffer too small when writing ASN.1 data structure.
Definition: asn1.h:56
#define ASN1_SEQUENCE
Definition: asn1.h:78
Configuration options (set of defines)
#define ASN1_CONSTRUCTED
Definition: asn1.h:88
Object Identifier (OID) database.
#define OID_AT_CN
id-at-commonName AttributeType:= {id-at 3}
Definition: oid.h:106
#define OID_SIZE(x)
Returns the size of the binary string, without the trailing \0.
Definition: asn1.h:94
int asn1_write_len(unsigned char **p, unsigned char *start, size_t len)
Write a length field in ASN.1 format Note: function works backwards in data buffer.
int asn1_write_printable_string(unsigned char **p, unsigned char *start, const char *text, size_t text_len)
Write a printable string tag (ASN1_PRINTABLE_STRING) and value in ASN.1 format Note: function works b...
#define ASN1_SET
Definition: asn1.h:79
asn1_buf val
The named value.
Definition: asn1.h:151
int x509_write_names(unsigned char **p, unsigned char *start, asn1_named_data *first)
asn1_buf oid
The object identifier.
Definition: asn1.h:150
int asn1_write_raw_buffer(unsigned char **p, unsigned char *start, const unsigned char *buf, size_t size)
Write raw buffer data Note: function works backwards in data buffer.
#define POLARSSL_ERR_X509_UNKNOWN_OID
Requested OID is unknown.
Definition: x509.h:49
#define OID_AT_POSTAL_ADDRESS
id-at-postalAddress AttributeType:= {id-at 16}
Definition: oid.h:113
#define OID_AT_ORGANIZATION
id-at-organizationName AttributeType:= {id-at 10}
Definition: oid.h:111
unsigned char * p
ASN1 data, e.g.
Definition: asn1.h:120
int x509_write_extensions(unsigned char **p, unsigned char *start, asn1_named_data *first)
#define OID_AT_ORG_UNIT
id-at-organizationalUnitName AttributeType:= {id-at 11}
Definition: oid.h:112
#define OID_AT_POSTAL_CODE
id-at-postalCode AttributeType:= {id-at 17}
Definition: oid.h:114
#define OID_PKCS9_EMAIL
emailAddress AttributeType ::= { pkcs-9 1 }
Definition: oid.h:194
#define ASN1_BIT_STRING
Definition: asn1.h:73
X.509 generic defines and structures.
#define OID_AT_LOCALITY
id-at-locality AttributeType:= {id-at 7}
Definition: oid.h:109
Container for a sequence or list of &#39;named&#39; ASN.1 data items.
Definition: asn1.h:148
size_t len
ASN1 length, e.g.
Definition: asn1.h:119
void asn1_free_named_data_list(asn1_named_data **head)
Free all entries in a asn1_named_data list Head will be set to NULL.
#define ASN1_CHK_ADD(g, f)
Definition: asn1write.h:32
#define OID_AT_SERIAL_NUMBER
id-at-serialNumber AttributeType:= {id-at 5}
Definition: oid.h:107
int asn1_write_algorithm_identifier(unsigned char **p, unsigned char *start, const char *oid, size_t oid_len, size_t par_len)
Write an AlgorithmIdentifier sequence in ASN.1 format Note: function works backwards in data buffer...
int asn1_write_bool(unsigned char **p, unsigned char *start, int boolean)
Write a boolean tag (ASN1_BOOLEAN) and value in ASN.1 format Note: function works backwards in data b...
struct _asn1_named_data * next
The next entry in the sequence.
Definition: asn1.h:152
int x509_write_sig(unsigned char **p, unsigned char *start, const char *oid, size_t oid_len, unsigned char *sig, size_t size)
ASN.1 buffer writing functionality.
int asn1_write_oid(unsigned char **p, unsigned char *start, const char *oid, size_t oid_len)
Write an OID tag (ASN1_OID) and data in ASN.1 format Note: function works backwards in data buffer...
#define ASN1_OCTET_STRING
Definition: asn1.h:74
int asn1_write_tag(unsigned char **p, unsigned char *start, unsigned char tag)
Write a ASN.1 tag in ASN.1 format Note: function works backwards in data buffer.
#define POLARSSL_ERR_X509_MALLOC_FAILED
Allocation of memory failed.
Definition: x509.h:64
#define OID_AT_STATE
id-at-state AttributeType:= {id-at 8}
Definition: oid.h:110
#define OID_AT_COUNTRY
id-at-countryName AttributeType:= {id-at 6}
Definition: oid.h:108