2 Unix SMB/CIFS implementation.
4 Copyright (C) Andrew Tridgell 2001
6 This program is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program; if not, write to the Free Software
18 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 /* free an asn1 structure */
24 void asn1_free(ASN1_DATA *data)
26 SAFE_FREE(data->data);
29 /* write to the ASN1 buffer, advancing the buffer pointer */
30 BOOL asn1_write(ASN1_DATA *data, const void *p, int len)
32 if (data->has_error) return False;
33 if (data->length < data->ofs+len) {
35 newp = Realloc(data->data, data->ofs+len);
37 SAFE_FREE(data->data);
38 data->has_error = True;
42 data->length = data->ofs+len;
44 memcpy(data->data + data->ofs, p, len);
49 /* useful fn for writing a uint8 */
50 BOOL asn1_write_uint8(ASN1_DATA *data, uint8 v)
52 return asn1_write(data, &v, 1);
55 /* push a tag onto the asn1 data buffer. Used for nested structures */
56 BOOL asn1_push_tag(ASN1_DATA *data, uint8 tag)
58 struct nesting *nesting;
60 asn1_write_uint8(data, tag);
61 nesting = (struct nesting *)malloc(sizeof(struct nesting));
63 data->has_error = True;
67 nesting->start = data->ofs;
68 nesting->next = data->nesting;
69 data->nesting = nesting;
70 return asn1_write_uint8(data, 0xff);
74 BOOL asn1_pop_tag(ASN1_DATA *data)
76 struct nesting *nesting;
79 nesting = data->nesting;
82 data->has_error = True;
85 len = data->ofs - (nesting->start+1);
86 /* yes, this is ugly. We don't know in advance how many bytes the length
87 of a tag will take, so we assumed 1 byte. If we were wrong then we
88 need to correct our mistake */
90 data->data[nesting->start] = 0x82;
91 if (!asn1_write_uint8(data, 0)) return False;
92 if (!asn1_write_uint8(data, 0)) return False;
93 memmove(data->data+nesting->start+3, data->data+nesting->start+1, len);
94 data->data[nesting->start+1] = len>>8;
95 data->data[nesting->start+2] = len&0xff;
96 } else if (len > 127) {
97 data->data[nesting->start] = 0x81;
98 if (!asn1_write_uint8(data, 0)) return False;
99 memmove(data->data+nesting->start+2, data->data+nesting->start+1, len);
100 data->data[nesting->start+1] = len;
102 data->data[nesting->start] = len;
105 data->nesting = nesting->next;
111 /* write an integer */
112 BOOL asn1_write_Integer(ASN1_DATA *data, int i)
114 if (!asn1_push_tag(data, ASN1_INTEGER)) return False;
116 asn1_write_uint8(data, i);
119 return asn1_pop_tag(data);
122 /* write an object ID to a ASN1 buffer */
123 BOOL asn1_write_OID(ASN1_DATA *data, const char *OID)
126 const char *p = (const char *)OID;
129 if (!asn1_push_tag(data, ASN1_OID))
131 v = strtol(p, &newp, 10);
133 v2 = strtol(p, &newp, 10);
135 if (!asn1_write_uint8(data, 40*v + v2))
139 v = strtol(p, &newp, 10);
141 if (v >= (1<<28)) asn1_write_uint8(data, 0x80 | ((v>>28)&0xff));
142 if (v >= (1<<21)) asn1_write_uint8(data, 0x80 | ((v>>21)&0xff));
143 if (v >= (1<<14)) asn1_write_uint8(data, 0x80 | ((v>>14)&0xff));
144 if (v >= (1<<7)) asn1_write_uint8(data, 0x80 | ((v>>7)&0xff));
145 if (!asn1_write_uint8(data, v&0x7f))
148 return asn1_pop_tag(data);
151 /* write an octet string */
152 BOOL asn1_write_OctetString(ASN1_DATA *data, const void *p, size_t length)
154 asn1_push_tag(data, ASN1_OCTET_STRING);
155 asn1_write(data, p, length);
157 return !data->has_error;
160 /* write a general string */
161 BOOL asn1_write_GeneralString(ASN1_DATA *data, const char *s)
163 asn1_push_tag(data, ASN1_GENERAL_STRING);
164 asn1_write(data, s, strlen(s));
166 return !data->has_error;
169 /* write a BOOLEAN */
170 BOOL asn1_write_BOOLEAN(ASN1_DATA *data, BOOL v)
172 asn1_write_uint8(data, ASN1_BOOLEAN);
173 asn1_write_uint8(data, v);
174 return !data->has_error;
177 /* write a BOOLEAN - hmm, I suspect this one is the correct one, and the
178 above boolean is bogus. Need to check */
179 BOOL asn1_write_BOOLEAN2(ASN1_DATA *data, BOOL v)
181 asn1_push_tag(data, ASN1_BOOLEAN);
182 asn1_write_uint8(data, v);
184 return !data->has_error;
187 /* check a BOOLEAN */
188 BOOL asn1_check_BOOLEAN(ASN1_DATA *data, BOOL v)
192 asn1_read_uint8(data, &b);
193 if (b != ASN1_BOOLEAN) {
194 data->has_error = True;
197 asn1_read_uint8(data, &b);
199 data->has_error = True;
202 return !data->has_error;
206 /* load a ASN1_DATA structure with a lump of data, ready to be parsed */
207 BOOL asn1_load(ASN1_DATA *data, DATA_BLOB blob)
210 data->data = memdup(blob.data, blob.length);
212 data->has_error = True;
215 data->length = blob.length;
219 /* read from a ASN1 buffer, advancing the buffer pointer */
220 BOOL asn1_read(ASN1_DATA *data, void *p, int len)
222 if (len < 0 || data->ofs + len < data->ofs || data->ofs + len < len) {
223 data->has_error = True;
227 if (data->ofs + len > data->length) {
228 data->has_error = True;
231 memcpy(p, data->data + data->ofs, len);
236 /* read a uint8 from a ASN1 buffer */
237 BOOL asn1_read_uint8(ASN1_DATA *data, uint8 *v)
239 return asn1_read(data, v, 1);
242 /* start reading a nested asn1 structure */
243 BOOL asn1_start_tag(ASN1_DATA *data, uint8 tag)
246 struct nesting *nesting;
248 if (!asn1_read_uint8(data, &b))
252 data->has_error = True;
255 nesting = (struct nesting *)malloc(sizeof(struct nesting));
257 data->has_error = True;
261 if (!asn1_read_uint8(data, &b)) {
267 if (!asn1_read_uint8(data, &b))
271 if (!asn1_read_uint8(data, &b))
273 nesting->taglen = (nesting->taglen << 8) | b;
279 nesting->start = data->ofs;
280 nesting->next = data->nesting;
281 data->nesting = nesting;
282 return !data->has_error;
286 /* stop reading a tag */
287 BOOL asn1_end_tag(ASN1_DATA *data)
289 struct nesting *nesting;
291 /* make sure we read it all */
292 if (asn1_tag_remaining(data) != 0) {
293 data->has_error = True;
297 nesting = data->nesting;
300 data->has_error = True;
304 data->nesting = nesting->next;
309 /* work out how many bytes are left in this nested tag */
310 int asn1_tag_remaining(ASN1_DATA *data)
312 if (!data->nesting) {
313 data->has_error = True;
316 return data->nesting->taglen - (data->ofs - data->nesting->start);
319 /* read an object ID from a ASN1 buffer */
320 BOOL asn1_read_OID(ASN1_DATA *data, char **OID)
326 if (!asn1_start_tag(data, ASN1_OID)) return False;
327 asn1_read_uint8(data, &b);
330 fstr_sprintf(el, "%u", b/40);
332 fstr_sprintf(el, " %u", b%40);
335 while (asn1_tag_remaining(data) > 0) {
338 asn1_read_uint8(data, &b);
339 v = (v<<7) | (b&0x7f);
340 } while (!data->has_error && b & 0x80);
341 fstr_sprintf(el, " %u", v);
349 return !data->has_error;
352 /* check that the next object ID is correct */
353 BOOL asn1_check_OID(ASN1_DATA *data, const char *OID)
357 if (!asn1_read_OID(data, &id)) return False;
359 if (strcmp(id, OID) != 0) {
360 data->has_error = True;
367 /* read a GeneralString from a ASN1 buffer */
368 BOOL asn1_read_GeneralString(ASN1_DATA *data, char **s)
371 if (!asn1_start_tag(data, ASN1_GENERAL_STRING)) return False;
372 len = asn1_tag_remaining(data);
374 data->has_error = True;
379 data->has_error = True;
382 asn1_read(data, *s, len);
385 return !data->has_error;
388 /* read a octet string blob */
389 BOOL asn1_read_OctetString(ASN1_DATA *data, DATA_BLOB *blob)
393 if (!asn1_start_tag(data, ASN1_OCTET_STRING)) return False;
394 len = asn1_tag_remaining(data);
396 data->has_error = True;
399 *blob = data_blob(NULL, len);
400 asn1_read(data, blob->data, len);
402 return !data->has_error;
405 /* read an interger */
406 BOOL asn1_read_Integer(ASN1_DATA *data, int *i)
411 if (!asn1_start_tag(data, ASN1_INTEGER)) return False;
412 while (asn1_tag_remaining(data)>0) {
413 asn1_read_uint8(data, &b);
416 return asn1_end_tag(data);
420 /* check a enumarted value is correct */
421 BOOL asn1_check_enumerated(ASN1_DATA *data, int v)
424 if (!asn1_start_tag(data, ASN1_ENUMERATED)) return False;
425 asn1_read_uint8(data, &b);
429 data->has_error = False;
431 return !data->has_error;
434 /* write an enumarted value to the stream */
435 BOOL asn1_write_enumerated(ASN1_DATA *data, uint8 v)
437 if (!asn1_push_tag(data, ASN1_ENUMERATED)) return False;
438 asn1_write_uint8(data, v);
440 return !data->has_error;