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1 /* v3_pci.c -*- mode:C; c-file-style: "eay" -*- */
2 /*
3  * Contributed to the OpenSSL Project 2004 by Richard Levitte
4  * (richard@levitte.org)
5  */
6 /* Copyright (c) 2004 Kungliga Tekniska Högskolan
7  * (Royal Institute of Technology, Stockholm, Sweden).
8  * All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  *
14  * 1. Redistributions of source code must retain the above copyright
15  *    notice, this list of conditions and the following disclaimer.
16  *
17  * 2. Redistributions in binary form must reproduce the above copyright
18  *    notice, this list of conditions and the following disclaimer in the
19  *    documentation and/or other materials provided with the distribution.
20  *
21  * 3. Neither the name of the Institute nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 #include <string.h>
39 
40 #include <openssl/conf.h>
41 #include <openssl/err.h>
42 #include <openssl/mem.h>
43 #include <openssl/obj.h>
44 #include <openssl/x509v3.h>
45 
46 #include "../internal.h"
47 
48 
49 static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
50                    BIO *out, int indent);
51 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
52                                           X509V3_CTX *ctx, char *str);
53 
54 const X509V3_EXT_METHOD v3_pci =
55     { NID_proxyCertInfo, 0, ASN1_ITEM_ref(PROXY_CERT_INFO_EXTENSION),
56     0, 0, 0, 0,
57     0, 0,
58     NULL, NULL,
59     (X509V3_EXT_I2R)i2r_pci,
60     (X509V3_EXT_R2I)r2i_pci,
61     NULL,
62 };
63 
i2r_pci(X509V3_EXT_METHOD * method,PROXY_CERT_INFO_EXTENSION * pci,BIO * out,int indent)64 static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *pci,
65                    BIO *out, int indent)
66 {
67     BIO_printf(out, "%*sPath Length Constraint: ", indent, "");
68     if (pci->pcPathLengthConstraint)
69         i2a_ASN1_INTEGER(out, pci->pcPathLengthConstraint);
70     else
71         BIO_printf(out, "infinite");
72     BIO_puts(out, "\n");
73     BIO_printf(out, "%*sPolicy Language: ", indent, "");
74     i2a_ASN1_OBJECT(out, pci->proxyPolicy->policyLanguage);
75     BIO_puts(out, "\n");
76     if (pci->proxyPolicy->policy && pci->proxyPolicy->policy->data)
77         BIO_printf(out, "%*sPolicy Text: %s\n", indent, "",
78                    pci->proxyPolicy->policy->data);
79     return 1;
80 }
81 
process_pci_value(CONF_VALUE * val,ASN1_OBJECT ** language,ASN1_INTEGER ** pathlen,ASN1_OCTET_STRING ** policy)82 static int process_pci_value(CONF_VALUE *val,
83                              ASN1_OBJECT **language, ASN1_INTEGER **pathlen,
84                              ASN1_OCTET_STRING **policy)
85 {
86     int free_policy = 0;
87 
88     if (strcmp(val->name, "language") == 0) {
89         if (*language) {
90             OPENSSL_PUT_ERROR(X509V3,
91                               X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
92             X509V3_conf_err(val);
93             return 0;
94         }
95         if (!(*language = OBJ_txt2obj(val->value, 0))) {
96             OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_OBJECT_IDENTIFIER);
97             X509V3_conf_err(val);
98             return 0;
99         }
100     } else if (strcmp(val->name, "pathlen") == 0) {
101         if (*pathlen) {
102             OPENSSL_PUT_ERROR(X509V3,
103                               X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
104             X509V3_conf_err(val);
105             return 0;
106         }
107         if (!X509V3_get_value_int(val, pathlen)) {
108             OPENSSL_PUT_ERROR(X509V3, X509V3_R_POLICY_PATH_LENGTH);
109             X509V3_conf_err(val);
110             return 0;
111         }
112     } else if (strcmp(val->name, "policy") == 0) {
113         unsigned char *tmp_data = NULL;
114         long val_len;
115         if (!*policy) {
116             *policy = ASN1_OCTET_STRING_new();
117             if (!*policy) {
118                 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
119                 X509V3_conf_err(val);
120                 return 0;
121             }
122             free_policy = 1;
123         }
124         if (strncmp(val->value, "hex:", 4) == 0) {
125             unsigned char *tmp_data2 =
126                 string_to_hex(val->value + 4, &val_len);
127 
128             if (!tmp_data2) {
129                 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ILLEGAL_HEX_DIGIT);
130                 X509V3_conf_err(val);
131                 goto err;
132             }
133 
134             tmp_data = OPENSSL_realloc((*policy)->data,
135                                        (*policy)->length + val_len + 1);
136             if (tmp_data) {
137                 (*policy)->data = tmp_data;
138                 OPENSSL_memcpy(&(*policy)->data[(*policy)->length],
139                        tmp_data2, val_len);
140                 (*policy)->length += val_len;
141                 (*policy)->data[(*policy)->length] = '\0';
142             } else {
143                 OPENSSL_free(tmp_data2);
144                 /*
145                  * realloc failure implies the original data space is b0rked
146                  * too!
147                  */
148                 (*policy)->data = NULL;
149                 (*policy)->length = 0;
150                 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
151                 X509V3_conf_err(val);
152                 goto err;
153             }
154             OPENSSL_free(tmp_data2);
155         } else if (strncmp(val->value, "text:", 5) == 0) {
156             val_len = strlen(val->value + 5);
157             tmp_data = OPENSSL_realloc((*policy)->data,
158                                        (*policy)->length + val_len + 1);
159             if (tmp_data) {
160                 (*policy)->data = tmp_data;
161                 OPENSSL_memcpy(&(*policy)->data[(*policy)->length],
162                        val->value + 5, val_len);
163                 (*policy)->length += val_len;
164                 (*policy)->data[(*policy)->length] = '\0';
165             } else {
166                 /*
167                  * realloc failure implies the original data space is b0rked
168                  * too!
169                  */
170                 (*policy)->data = NULL;
171                 (*policy)->length = 0;
172                 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
173                 X509V3_conf_err(val);
174                 goto err;
175             }
176         } else {
177             OPENSSL_PUT_ERROR(X509V3, X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
178             X509V3_conf_err(val);
179             goto err;
180         }
181         if (!tmp_data) {
182             OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
183             X509V3_conf_err(val);
184             goto err;
185         }
186     }
187     return 1;
188  err:
189     if (free_policy) {
190         ASN1_OCTET_STRING_free(*policy);
191         *policy = NULL;
192     }
193     return 0;
194 }
195 
r2i_pci(X509V3_EXT_METHOD * method,X509V3_CTX * ctx,char * value)196 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
197                                           X509V3_CTX *ctx, char *value)
198 {
199     PROXY_CERT_INFO_EXTENSION *pci = NULL;
200     STACK_OF(CONF_VALUE) *vals;
201     ASN1_OBJECT *language = NULL;
202     ASN1_INTEGER *pathlen = NULL;
203     ASN1_OCTET_STRING *policy = NULL;
204     size_t i, j;
205     int nid;
206 
207     vals = X509V3_parse_list(value);
208     for (i = 0; i < sk_CONF_VALUE_num(vals); i++) {
209         CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
210         if (!cnf->name || (*cnf->name != '@' && !cnf->value)) {
211             OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_PROXY_POLICY_SETTING);
212             X509V3_conf_err(cnf);
213             goto err;
214         }
215         if (*cnf->name == '@') {
216             STACK_OF(CONF_VALUE) *sect;
217             int success_p = 1;
218 
219             sect = X509V3_get_section(ctx, cnf->name + 1);
220             if (!sect) {
221                 OPENSSL_PUT_ERROR(X509V3, X509V3_R_INVALID_SECTION);
222                 X509V3_conf_err(cnf);
223                 goto err;
224             }
225             for (j = 0; success_p && j < sk_CONF_VALUE_num(sect); j++) {
226                 success_p =
227                     process_pci_value(sk_CONF_VALUE_value(sect, j),
228                                       &language, &pathlen, &policy);
229             }
230             X509V3_section_free(ctx, sect);
231             if (!success_p)
232                 goto err;
233         } else {
234             if (!process_pci_value(cnf, &language, &pathlen, &policy)) {
235                 X509V3_conf_err(cnf);
236                 goto err;
237             }
238         }
239     }
240 
241     /* Language is mandatory */
242     if (!language) {
243         OPENSSL_PUT_ERROR(X509V3,
244                           X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
245         goto err;
246     }
247     nid = OBJ_obj2nid(language);
248     if ((nid == NID_Independent || nid == NID_id_ppl_inheritAll) && policy) {
249         OPENSSL_PUT_ERROR(X509V3,
250                           X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
251         goto err;
252     }
253 
254     pci = PROXY_CERT_INFO_EXTENSION_new();
255     if (!pci) {
256         OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
257         goto err;
258     }
259 
260     pci->proxyPolicy->policyLanguage = language;
261     language = NULL;
262     pci->proxyPolicy->policy = policy;
263     policy = NULL;
264     pci->pcPathLengthConstraint = pathlen;
265     pathlen = NULL;
266     goto end;
267  err:
268     if (language) {
269         ASN1_OBJECT_free(language);
270         language = NULL;
271     }
272     if (pathlen) {
273         ASN1_INTEGER_free(pathlen);
274         pathlen = NULL;
275     }
276     if (policy) {
277         ASN1_OCTET_STRING_free(policy);
278         policy = NULL;
279     }
280     if (pci) {
281         PROXY_CERT_INFO_EXTENSION_free(pci);
282         pci = NULL;
283     }
284  end:
285     sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
286     return pci;
287 }
288