v3_utl.c revision 55714 
1/* v3_utl.c */
2/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
3 * project 1999.
4 */
5/* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58/* X509 v3 extension utilities */
59
60
61#include <stdio.h>
62#include <ctype.h>
63#include "cryptlib.h"
64#include <openssl/conf.h>
65#include <openssl/x509v3.h>
66
67static char *strip_spaces(char *name);
68
69/* Add a CONF_VALUE name value pair to stack */
70
71int X509V3_add_value(const char *name, const char *value,
72						STACK_OF(CONF_VALUE) **extlist)
73{
74	CONF_VALUE *vtmp = NULL;
75	char *tname = NULL, *tvalue = NULL;
76	if(name && !(tname = BUF_strdup(name))) goto err;
77	if(value && !(tvalue = BUF_strdup(value))) goto err;;
78	if(!(vtmp = (CONF_VALUE *)Malloc(sizeof(CONF_VALUE)))) goto err;
79	if(!*extlist && !(*extlist = sk_CONF_VALUE_new(NULL))) goto err;
80	vtmp->section = NULL;
81	vtmp->name = tname;
82	vtmp->value = tvalue;
83	if(!sk_CONF_VALUE_push(*extlist, vtmp)) goto err;
84	return 1;
85	err:
86	X509V3err(X509V3_F_X509V3_ADD_VALUE,ERR_R_MALLOC_FAILURE);
87	if(vtmp) Free(vtmp);
88	if(tname) Free(tname);
89	if(tvalue) Free(tvalue);
90	return 0;
91}
92
93int X509V3_add_value_uchar(const char *name, const unsigned char *value,
94			   STACK_OF(CONF_VALUE) **extlist)
95    {
96    return X509V3_add_value(name,(const char *)value,extlist);
97    }
98
99/* Free function for STACK_OF(CONF_VALUE) */
100
101void X509V3_conf_free(CONF_VALUE *conf)
102{
103	if(!conf) return;
104	if(conf->name) Free(conf->name);
105	if(conf->value) Free(conf->value);
106	if(conf->section) Free(conf->section);
107	Free((char *)conf);
108}
109
110int X509V3_add_value_bool(const char *name, int asn1_bool,
111						STACK_OF(CONF_VALUE) **extlist)
112{
113	if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);
114	return X509V3_add_value(name, "FALSE", extlist);
115}
116
117int X509V3_add_value_bool_nf(char *name, int asn1_bool,
118						STACK_OF(CONF_VALUE) **extlist)
119{
120	if(asn1_bool) return X509V3_add_value(name, "TRUE", extlist);
121	return 1;
122}
123
124
125char *i2s_ASN1_ENUMERATED(X509V3_EXT_METHOD *method, ASN1_ENUMERATED *a)
126{
127	BIGNUM *bntmp = NULL;
128	char *strtmp = NULL;
129	if(!a) return NULL;
130	if(!(bntmp = ASN1_ENUMERATED_to_BN(a, NULL)) ||
131	    !(strtmp = BN_bn2dec(bntmp)) )
132		X509V3err(X509V3_F_I2S_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
133	BN_free(bntmp);
134	return strtmp;
135}
136
137char *i2s_ASN1_INTEGER(X509V3_EXT_METHOD *method, ASN1_INTEGER *a)
138{
139	BIGNUM *bntmp = NULL;
140	char *strtmp = NULL;
141	if(!a) return NULL;
142	if(!(bntmp = ASN1_INTEGER_to_BN(a, NULL)) ||
143	    !(strtmp = BN_bn2dec(bntmp)) )
144		X509V3err(X509V3_F_I2S_ASN1_INTEGER,ERR_R_MALLOC_FAILURE);
145	BN_free(bntmp);
146	return strtmp;
147}
148
149ASN1_INTEGER *s2i_ASN1_INTEGER(X509V3_EXT_METHOD *method, char *value)
150{
151	BIGNUM *bn = NULL;
152	ASN1_INTEGER *aint;
153	bn = BN_new();
154	if(!value) {
155		X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_INVALID_NULL_VALUE);
156		return 0;
157	}
158	if(!BN_dec2bn(&bn, value)) {
159		X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_DEC2BN_ERROR);
160		return 0;
161	}
162
163	if(!(aint = BN_to_ASN1_INTEGER(bn, NULL))) {
164		X509V3err(X509V3_F_S2I_ASN1_INTEGER,X509V3_R_BN_TO_ASN1_INTEGER_ERROR);
165		return 0;
166	}
167	BN_free(bn);
168	return aint;
169}
170
171int X509V3_add_value_int(const char *name, ASN1_INTEGER *aint,
172	     STACK_OF(CONF_VALUE) **extlist)
173{
174	char *strtmp;
175	int ret;
176	if(!aint) return 1;
177	if(!(strtmp = i2s_ASN1_INTEGER(NULL, aint))) return 0;
178	ret = X509V3_add_value(name, strtmp, extlist);
179	Free(strtmp);
180	return ret;
181}
182
183int X509V3_get_value_bool(CONF_VALUE *value, int *asn1_bool)
184{
185	char *btmp;
186	if(!(btmp = value->value)) goto err;
187	if(!strcmp(btmp, "TRUE") || !strcmp(btmp, "true")
188		 || !strcmp(btmp, "Y") || !strcmp(btmp, "y")
189		|| !strcmp(btmp, "YES") || !strcmp(btmp, "yes")) {
190		*asn1_bool = 0xff;
191		return 1;
192	} else if(!strcmp(btmp, "FALSE") || !strcmp(btmp, "false")
193		 || !strcmp(btmp, "N") || !strcmp(btmp, "n")
194		|| !strcmp(btmp, "NO") || !strcmp(btmp, "no")) {
195		*asn1_bool = 0;
196		return 1;
197	}
198	err:
199	X509V3err(X509V3_F_X509V3_GET_VALUE_BOOL,X509V3_R_INVALID_BOOLEAN_STRING);
200	X509V3_conf_err(value);
201	return 0;
202}
203
204int X509V3_get_value_int(CONF_VALUE *value, ASN1_INTEGER **aint)
205{
206	ASN1_INTEGER *itmp;
207	if(!(itmp = s2i_ASN1_INTEGER(NULL, value->value))) {
208		X509V3_conf_err(value);
209		return 0;
210	}
211	*aint = itmp;
212	return 1;
213}
214
215#define HDR_NAME	1
216#define HDR_VALUE	2
217
218/*#define DEBUG*/
219
220STACK_OF(CONF_VALUE) *X509V3_parse_list(char *line)
221{
222	char *p, *q, c;
223	char *ntmp, *vtmp;
224	STACK_OF(CONF_VALUE) *values = NULL;
225	char *linebuf;
226	int state;
227	/* We are going to modify the line so copy it first */
228	linebuf = BUF_strdup(line);
229	state = HDR_NAME;
230	ntmp = NULL;
231	/* Go through all characters */
232	for(p = linebuf, q = linebuf; (c = *p) && (c!='\r') && (c!='\n'); p++) {
233
234		switch(state) {
235			case HDR_NAME:
236			if(c == ':') {
237				state = HDR_VALUE;
238				*p = 0;
239				ntmp = strip_spaces(q);
240				if(!ntmp) {
241					X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
242					goto err;
243				}
244				q = p + 1;
245			} else if(c == ',') {
246				*p = 0;
247				ntmp = strip_spaces(q);
248				q = p + 1;
249#ifdef DEBUG
250				printf("%s\n", ntmp);
251#endif
252				if(!ntmp) {
253					X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
254					goto err;
255				}
256				X509V3_add_value(ntmp, NULL, &values);
257			}
258			break ;
259
260			case HDR_VALUE:
261			if(c == ',') {
262				state = HDR_NAME;
263				*p = 0;
264				vtmp = strip_spaces(q);
265#ifdef DEBUG
266				printf("%s\n", ntmp);
267#endif
268				if(!vtmp) {
269					X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);
270					goto err;
271				}
272				X509V3_add_value(ntmp, vtmp, &values);
273				ntmp = NULL;
274				q = p + 1;
275			}
276
277		}
278	}
279
280	if(state == HDR_VALUE) {
281		vtmp = strip_spaces(q);
282#ifdef DEBUG
283		printf("%s=%s\n", ntmp, vtmp);
284#endif
285		if(!vtmp) {
286			X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_VALUE);
287			goto err;
288		}
289		X509V3_add_value(ntmp, vtmp, &values);
290	} else {
291		ntmp = strip_spaces(q);
292#ifdef DEBUG
293		printf("%s\n", ntmp);
294#endif
295		if(!ntmp) {
296			X509V3err(X509V3_F_X509V3_PARSE_LIST, X509V3_R_INVALID_NULL_NAME);
297			goto err;
298		}
299		X509V3_add_value(ntmp, NULL, &values);
300	}
301Free(linebuf);
302return values;
303
304err:
305Free(linebuf);
306sk_CONF_VALUE_pop_free(values, X509V3_conf_free);
307return NULL;
308
309}
310
311/* Delete leading and trailing spaces from a string */
312static char *strip_spaces(char *name)
313{
314	char *p, *q;
315	/* Skip over leading spaces */
316	p = name;
317	while(*p && isspace((unsigned char)*p)) p++;
318	if(!*p) return NULL;
319	q = p + strlen(p) - 1;
320	while((q != p) && isspace((unsigned char)*q)) q--;
321	if(p != q) q[1] = 0;
322	if(!*p) return NULL;
323	return p;
324}
325
326/* hex string utilities */
327
328/* Given a buffer of length 'len' return a Malloc'ed string with its
329 * hex representation
330 */
331
332char *hex_to_string(unsigned char *buffer, long len)
333{
334	char *tmp, *q;
335	unsigned char *p;
336	int i;
337	static char hexdig[] = "0123456789ABCDEF";
338	if(!buffer || !len) return NULL;
339	if(!(tmp = Malloc(len * 3 + 1))) {
340		X509V3err(X509V3_F_HEX_TO_STRING,ERR_R_MALLOC_FAILURE);
341		return NULL;
342	}
343	q = tmp;
344	for(i = 0, p = buffer; i < len; i++,p++) {
345		*q++ = hexdig[(*p >> 4) & 0xf];
346		*q++ = hexdig[*p & 0xf];
347		*q++ = ':';
348	}
349	q[-1] = 0;
350	return tmp;
351}
352
353/* Give a string of hex digits convert to
354 * a buffer
355 */
356
357unsigned char *string_to_hex(char *str, long *len)
358{
359	unsigned char *hexbuf, *q;
360	unsigned char ch, cl, *p;
361	if(!str) {
362		X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_INVALID_NULL_ARGUMENT);
363		return NULL;
364	}
365	if(!(hexbuf = Malloc(strlen(str) >> 1))) goto err;
366	for(p = (unsigned char *)str, q = hexbuf; *p;) {
367		ch = *p++;
368		if(ch == ':') continue;
369		cl = *p++;
370		if(!cl) {
371			X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ODD_NUMBER_OF_DIGITS);
372			Free(hexbuf);
373			return NULL;
374		}
375		if(isupper(ch)) ch = tolower(ch);
376		if(isupper(cl)) cl = tolower(cl);
377
378		if((ch >= '0') && (ch <= '9')) ch -= '0';
379		else if ((ch >= 'a') && (ch <= 'f')) ch -= 'a' - 10;
380		else goto badhex;
381
382		if((cl >= '0') && (cl <= '9')) cl -= '0';
383		else if ((cl >= 'a') && (cl <= 'f')) cl -= 'a' - 10;
384		else goto badhex;
385
386		*q++ = (ch << 4) | cl;
387	}
388
389	if(len) *len = q - hexbuf;
390
391	return hexbuf;
392
393	err:
394	if(hexbuf) Free(hexbuf);
395	X509V3err(X509V3_F_STRING_TO_HEX,ERR_R_MALLOC_FAILURE);
396	return NULL;
397
398	badhex:
399	Free(hexbuf);
400	X509V3err(X509V3_F_STRING_TO_HEX,X509V3_R_ILLEGAL_HEX_DIGIT);
401	return NULL;
402
403}
404
405/* V2I name comparison function: returns zero if 'name' matches
406 * cmp or cmp.*
407 */
408
409int name_cmp(const char *name, const char *cmp)
410{
411	int len, ret;
412	char c;
413	len = strlen(cmp);
414	if((ret = strncmp(name, cmp, len))) return ret;
415	c = name[len];
416	if(!c || (c=='.')) return 0;
417	return 1;
418}
419