1 /* $OpenBSD: x509_pci.c,v 1.2 2021/08/24 15:23:03 tb Exp $ */
2 /* Contributed to the OpenSSL Project 2004
3 * by Richard Levitte (richard@levitte.org)
4 */
5 /* Copyright (c) 2004 Kungliga Tekniska H�gskolan
6 * (Royal Institute of Technology, Stockholm, Sweden).
7 * All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 *
20 * 3. Neither the name of the Institute nor the names of its contributors
21 * may be used to endorse or promote products derived from this software
22 * without specific prior written permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37 #include <stdio.h>
38 #include <string.h>
39
40 #include <openssl/conf.h>
41 #include <openssl/err.h>
42 #include <openssl/x509v3.h>
43
44 static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
45 BIO *out, int indent);
46 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
47 X509V3_CTX *ctx, char *str);
48
49 const X509V3_EXT_METHOD v3_pci = {
50 .ext_nid = NID_proxyCertInfo,
51 .ext_flags = 0,
52 .it = &PROXY_CERT_INFO_EXTENSION_it,
53 .ext_new = NULL,
54 .ext_free = NULL,
55 .d2i = NULL,
56 .i2d = NULL,
57 .i2s = NULL,
58 .s2i = NULL,
59 .i2v = NULL,
60 .v2i = NULL,
61 .i2r = (X509V3_EXT_I2R)i2r_pci,
62 .r2i = (X509V3_EXT_R2I)r2i_pci,
63 .usr_data = NULL,
64 };
65
66 static int
i2r_pci(X509V3_EXT_METHOD * method,PROXY_CERT_INFO_EXTENSION * pci,BIO * out,int indent)67 i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *pci, BIO *out,
68 int indent)
69 {
70 BIO_printf(out, "%*sPath Length Constraint: ", indent, "");
71 if (pci->pcPathLengthConstraint)
72 i2a_ASN1_INTEGER(out, pci->pcPathLengthConstraint);
73 else
74 BIO_printf(out, "infinite");
75 BIO_puts(out, "\n");
76 BIO_printf(out, "%*sPolicy Language: ", indent, "");
77 i2a_ASN1_OBJECT(out, pci->proxyPolicy->policyLanguage);
78 BIO_puts(out, "\n");
79 if (pci->proxyPolicy->policy && pci->proxyPolicy->policy->data)
80 BIO_printf(out, "%*sPolicy Text: %.*s\n", indent, "",
81 pci->proxyPolicy->policy->length,
82 pci->proxyPolicy->policy->data);
83 return 1;
84 }
85
86 static int
process_pci_value(CONF_VALUE * val,ASN1_OBJECT ** language,ASN1_INTEGER ** pathlen,ASN1_OCTET_STRING ** policy)87 process_pci_value(CONF_VALUE *val, ASN1_OBJECT **language,
88 ASN1_INTEGER **pathlen, ASN1_OCTET_STRING **policy)
89 {
90 int free_policy = 0;
91
92 if (strcmp(val->name, "language") == 0) {
93 if (*language) {
94 X509V3error(X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
95 X509V3_conf_err(val);
96 return 0;
97 }
98 if (!(*language = OBJ_txt2obj(val->value, 0))) {
99 X509V3error(X509V3_R_INVALID_OBJECT_IDENTIFIER);
100 X509V3_conf_err(val);
101 return 0;
102 }
103 }
104 else if (strcmp(val->name, "pathlen") == 0) {
105 if (*pathlen) {
106 X509V3error(X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
107 X509V3_conf_err(val);
108 return 0;
109 }
110 if (!X509V3_get_value_int(val, pathlen)) {
111 X509V3error(X509V3_R_POLICY_PATH_LENGTH);
112 X509V3_conf_err(val);
113 return 0;
114 }
115 }
116 else if (strcmp(val->name, "policy") == 0) {
117 unsigned char *tmp_data = NULL;
118 long val_len;
119 if (!*policy) {
120 *policy = ASN1_OCTET_STRING_new();
121 if (!*policy) {
122 X509V3error(ERR_R_MALLOC_FAILURE);
123 X509V3_conf_err(val);
124 return 0;
125 }
126 free_policy = 1;
127 }
128 if (strncmp(val->value, "hex:", 4) == 0) {
129 unsigned char *tmp_data2 =
130 string_to_hex(val->value + 4, &val_len);
131
132 if (!tmp_data2) {
133 X509V3error(X509V3_R_ILLEGAL_HEX_DIGIT);
134 X509V3_conf_err(val);
135 goto err;
136 }
137
138 tmp_data = realloc((*policy)->data,
139 (*policy)->length + val_len + 1);
140 if (tmp_data) {
141 (*policy)->data = tmp_data;
142 memcpy(&(*policy)->data[(*policy)->length],
143 tmp_data2, val_len);
144 (*policy)->length += val_len;
145 (*policy)->data[(*policy)->length] = '\0';
146 } else {
147 free(tmp_data2);
148 free((*policy)->data);
149 (*policy)->data = NULL;
150 (*policy)->length = 0;
151 X509V3error(ERR_R_MALLOC_FAILURE);
152 X509V3_conf_err(val);
153 goto err;
154 }
155 free(tmp_data2);
156 }
157 else if (strncmp(val->value, "file:", 5) == 0) {
158 unsigned char buf[2048];
159 int n;
160 BIO *b = BIO_new_file(val->value + 5, "r");
161 if (!b) {
162 X509V3error(ERR_R_BIO_LIB);
163 X509V3_conf_err(val);
164 goto err;
165 }
166 while ((n = BIO_read(b, buf, sizeof(buf))) > 0 ||
167 (n == 0 && BIO_should_retry(b))) {
168 if (!n)
169 continue;
170
171 tmp_data = realloc((*policy)->data,
172 (*policy)->length + n + 1);
173
174 if (!tmp_data)
175 break;
176
177 (*policy)->data = tmp_data;
178 memcpy(&(*policy)->data[(*policy)->length],
179 buf, n);
180 (*policy)->length += n;
181 (*policy)->data[(*policy)->length] = '\0';
182 }
183 BIO_free_all(b);
184
185 if (n < 0) {
186 X509V3error(ERR_R_BIO_LIB);
187 X509V3_conf_err(val);
188 goto err;
189 }
190 }
191 else if (strncmp(val->value, "text:", 5) == 0) {
192 val_len = strlen(val->value + 5);
193 tmp_data = realloc((*policy)->data,
194 (*policy)->length + val_len + 1);
195 if (tmp_data) {
196 (*policy)->data = tmp_data;
197 memcpy(&(*policy)->data[(*policy)->length],
198 val->value + 5, val_len);
199 (*policy)->length += val_len;
200 (*policy)->data[(*policy)->length] = '\0';
201 } else {
202 free((*policy)->data);
203 (*policy)->data = NULL;
204 (*policy)->length = 0;
205 X509V3error(ERR_R_MALLOC_FAILURE);
206 X509V3_conf_err(val);
207 goto err;
208 }
209 } else {
210 X509V3error(X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
211 X509V3_conf_err(val);
212 goto err;
213 }
214 if (!tmp_data) {
215 X509V3error(ERR_R_MALLOC_FAILURE);
216 X509V3_conf_err(val);
217 goto err;
218 }
219 }
220 return 1;
221
222 err:
223 if (free_policy) {
224 ASN1_OCTET_STRING_free(*policy);
225 *policy = NULL;
226 }
227 return 0;
228 }
229
230 static PROXY_CERT_INFO_EXTENSION *
r2i_pci(X509V3_EXT_METHOD * method,X509V3_CTX * ctx,char * value)231 r2i_pci(X509V3_EXT_METHOD *method, X509V3_CTX *ctx, char *value)
232 {
233 PROXY_CERT_INFO_EXTENSION *pci = NULL;
234 STACK_OF(CONF_VALUE) *vals;
235 ASN1_OBJECT *language = NULL;
236 ASN1_INTEGER *pathlen = NULL;
237 ASN1_OCTET_STRING *policy = NULL;
238 int i, j;
239
240 vals = X509V3_parse_list(value);
241 for (i = 0; i < sk_CONF_VALUE_num(vals); i++) {
242 CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
243 if (!cnf->name || (*cnf->name != '@' && !cnf->value)) {
244 X509V3error(X509V3_R_INVALID_PROXY_POLICY_SETTING);
245 X509V3_conf_err(cnf);
246 goto err;
247 }
248 if (*cnf->name == '@') {
249 STACK_OF(CONF_VALUE) *sect;
250 int success_p = 1;
251
252 sect = X509V3_get_section(ctx, cnf->name + 1);
253 if (!sect) {
254 X509V3error(X509V3_R_INVALID_SECTION);
255 X509V3_conf_err(cnf);
256 goto err;
257 }
258 for (j = 0; success_p &&
259 j < sk_CONF_VALUE_num(sect); j++) {
260 success_p = process_pci_value(
261 sk_CONF_VALUE_value(sect, j),
262 &language, &pathlen, &policy);
263 }
264 X509V3_section_free(ctx, sect);
265 if (!success_p)
266 goto err;
267 } else {
268 if (!process_pci_value(cnf,
269 &language, &pathlen, &policy)) {
270 X509V3_conf_err(cnf);
271 goto err;
272 }
273 }
274 }
275
276 /* Language is mandatory */
277 if (!language) {
278 X509V3error(X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
279 goto err;
280 }
281 i = OBJ_obj2nid(language);
282 if ((i == NID_Independent || i == NID_id_ppl_inheritAll) && policy) {
283 X509V3error(X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
284 goto err;
285 }
286
287 pci = PROXY_CERT_INFO_EXTENSION_new();
288 if (!pci) {
289 X509V3error(ERR_R_MALLOC_FAILURE);
290 goto err;
291 }
292
293 pci->proxyPolicy->policyLanguage = language;
294 language = NULL;
295 pci->proxyPolicy->policy = policy;
296 policy = NULL;
297 pci->pcPathLengthConstraint = pathlen;
298 pathlen = NULL;
299 goto end;
300
301 err:
302 ASN1_OBJECT_free(language);
303 language = NULL;
304 ASN1_INTEGER_free(pathlen);
305 pathlen = NULL;
306 ASN1_OCTET_STRING_free(policy);
307 policy = NULL;
308 end:
309 sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
310 return pci;
311 }
312