1/*
2 * Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License").  You may not use
5 * this file except in compliance with the License.  You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10/*
11 * This file is dual-licensed and is also available under the following
12 * terms:
13 *
14 * Copyright (c) 2004 Kungliga Tekniska H��gskolan
15 * (Royal Institute of Technology, Stockholm, Sweden).
16 * All rights reserved.
17 *
18 * Redistribution and use in source and binary forms, with or without
19 * modification, are permitted provided that the following conditions
20 * are met:
21 *
22 * 1. Redistributions of source code must retain the above copyright
23 *    notice, this list of conditions and the following disclaimer.
24 *
25 * 2. Redistributions in binary form must reproduce the above copyright
26 *    notice, this list of conditions and the following disclaimer in the
27 *    documentation and/or other materials provided with the distribution.
28 *
29 * 3. Neither the name of the Institute nor the names of its contributors
30 *    may be used to endorse or promote products derived from this software
31 *    without specific prior written permission.
32 *
33 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
34 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
35 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
36 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
37 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
38 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
39 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
40 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
41 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
42 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
43 * SUCH DAMAGE.
44 */
45
46#include <stdio.h>
47#include "internal/cryptlib.h"
48#include <openssl/conf.h>
49#include <openssl/x509v3.h>
50#include "ext_dat.h"
51
52static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
53                   BIO *out, int indent);
54static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
55                                          X509V3_CTX *ctx, char *str);
56
57const X509V3_EXT_METHOD ossl_v3_pci =
58    { NID_proxyCertInfo, 0, ASN1_ITEM_ref(PROXY_CERT_INFO_EXTENSION),
59    0, 0, 0, 0,
60    0, 0,
61    NULL, NULL,
62    (X509V3_EXT_I2R)i2r_pci,
63    (X509V3_EXT_R2I)r2i_pci,
64    NULL,
65};
66
67static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *pci,
68                   BIO *out, 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    if (pci->proxyPolicy->policy && pci->proxyPolicy->policy->data)
79        BIO_printf(out, "\n%*sPolicy Text: %.*s", indent, "",
80                   pci->proxyPolicy->policy->length,
81                   pci->proxyPolicy->policy->data);
82    return 1;
83}
84
85static int process_pci_value(CONF_VALUE *val,
86                             ASN1_OBJECT **language, ASN1_INTEGER **pathlen,
87                             ASN1_OCTET_STRING **policy)
88{
89    int free_policy = 0;
90
91    if (strcmp(val->name, "language") == 0) {
92        if (*language) {
93            ERR_raise(ERR_LIB_X509V3, X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
94            X509V3_conf_err(val);
95            return 0;
96        }
97        if ((*language = OBJ_txt2obj(val->value, 0)) == NULL) {
98            ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_OBJECT_IDENTIFIER);
99            X509V3_conf_err(val);
100            return 0;
101        }
102    } else if (strcmp(val->name, "pathlen") == 0) {
103        if (*pathlen) {
104            ERR_raise(ERR_LIB_X509V3,
105                      X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
106            X509V3_conf_err(val);
107            return 0;
108        }
109        if (!X509V3_get_value_int(val, pathlen)) {
110            ERR_raise(ERR_LIB_X509V3, X509V3_R_POLICY_PATH_LENGTH);
111            X509V3_conf_err(val);
112            return 0;
113        }
114    } else if (strcmp(val->name, "policy") == 0) {
115        unsigned char *tmp_data = NULL;
116        long val_len;
117
118        if (*policy == NULL) {
119            *policy = ASN1_OCTET_STRING_new();
120            if (*policy == NULL) {
121                ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
122                X509V3_conf_err(val);
123                return 0;
124            }
125            free_policy = 1;
126        }
127        if (strncmp(val->value, "hex:", 4) == 0) {
128            unsigned char *tmp_data2 =
129                OPENSSL_hexstr2buf(val->value + 4, &val_len);
130
131            if (!tmp_data2) {
132                X509V3_conf_err(val);
133                goto err;
134            }
135
136            tmp_data = OPENSSL_realloc((*policy)->data,
137                                       (*policy)->length + val_len + 1);
138            if (tmp_data) {
139                (*policy)->data = tmp_data;
140                memcpy(&(*policy)->data[(*policy)->length],
141                       tmp_data2, val_len);
142                (*policy)->length += val_len;
143                (*policy)->data[(*policy)->length] = '\0';
144            } else {
145                OPENSSL_free(tmp_data2);
146                /*
147                 * realloc failure implies the original data space is b0rked
148                 * too!
149                 */
150                OPENSSL_free((*policy)->data);
151                (*policy)->data = NULL;
152                (*policy)->length = 0;
153                ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
154                X509V3_conf_err(val);
155                goto err;
156            }
157            OPENSSL_free(tmp_data2);
158        } else if (strncmp(val->value, "file:", 5) == 0) {
159            unsigned char buf[2048];
160            int n;
161            BIO *b = BIO_new_file(val->value + 5, "r");
162            if (!b) {
163                ERR_raise(ERR_LIB_X509V3, ERR_R_BIO_LIB);
164                X509V3_conf_err(val);
165                goto err;
166            }
167            while ((n = BIO_read(b, buf, sizeof(buf))) > 0
168                   || (n == 0 && BIO_should_retry(b))) {
169                if (!n)
170                    continue;
171
172                tmp_data = OPENSSL_realloc((*policy)->data,
173                                           (*policy)->length + n + 1);
174
175                if (!tmp_data) {
176                    OPENSSL_free((*policy)->data);
177                    (*policy)->data = NULL;
178                    (*policy)->length = 0;
179                    ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
180                    X509V3_conf_err(val);
181                    BIO_free_all(b);
182                    goto err;
183                }
184
185                (*policy)->data = tmp_data;
186                memcpy(&(*policy)->data[(*policy)->length], buf, n);
187                (*policy)->length += n;
188                (*policy)->data[(*policy)->length] = '\0';
189            }
190            BIO_free_all(b);
191
192            if (n < 0) {
193                ERR_raise(ERR_LIB_X509V3, ERR_R_BIO_LIB);
194                X509V3_conf_err(val);
195                goto err;
196            }
197        } else if (strncmp(val->value, "text:", 5) == 0) {
198            val_len = strlen(val->value + 5);
199            tmp_data = OPENSSL_realloc((*policy)->data,
200                                       (*policy)->length + val_len + 1);
201            if (tmp_data) {
202                (*policy)->data = tmp_data;
203                memcpy(&(*policy)->data[(*policy)->length],
204                       val->value + 5, val_len);
205                (*policy)->length += val_len;
206                (*policy)->data[(*policy)->length] = '\0';
207            } else {
208                /*
209                 * realloc failure implies the original data space is b0rked
210                 * too!
211                 */
212                OPENSSL_free((*policy)->data);
213                (*policy)->data = NULL;
214                (*policy)->length = 0;
215                ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
216                X509V3_conf_err(val);
217                goto err;
218            }
219        } else {
220            ERR_raise(ERR_LIB_X509V3, X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
221            X509V3_conf_err(val);
222            goto err;
223        }
224        if (!tmp_data) {
225            ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
226            X509V3_conf_err(val);
227            goto err;
228        }
229    }
230    return 1;
231 err:
232    if (free_policy) {
233        ASN1_OCTET_STRING_free(*policy);
234        *policy = NULL;
235    }
236    return 0;
237}
238
239static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
240                                          X509V3_CTX *ctx, char *value)
241{
242    PROXY_CERT_INFO_EXTENSION *pci = NULL;
243    STACK_OF(CONF_VALUE) *vals;
244    ASN1_OBJECT *language = NULL;
245    ASN1_INTEGER *pathlen = NULL;
246    ASN1_OCTET_STRING *policy = NULL;
247    int i, j;
248
249    vals = X509V3_parse_list(value);
250    for (i = 0; i < sk_CONF_VALUE_num(vals); i++) {
251        CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
252
253        if (!cnf->name || (*cnf->name != '@' && !cnf->value)) {
254            ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_PROXY_POLICY_SETTING);
255            X509V3_conf_err(cnf);
256            goto err;
257        }
258        if (*cnf->name == '@') {
259            STACK_OF(CONF_VALUE) *sect;
260            int success_p = 1;
261
262            sect = X509V3_get_section(ctx, cnf->name + 1);
263            if (!sect) {
264                ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_SECTION);
265                X509V3_conf_err(cnf);
266                goto err;
267            }
268            for (j = 0; success_p && j < sk_CONF_VALUE_num(sect); j++) {
269                success_p =
270                    process_pci_value(sk_CONF_VALUE_value(sect, j),
271                                      &language, &pathlen, &policy);
272            }
273            X509V3_section_free(ctx, sect);
274            if (!success_p)
275                goto err;
276        } else {
277            if (!process_pci_value(cnf, &language, &pathlen, &policy)) {
278                X509V3_conf_err(cnf);
279                goto err;
280            }
281        }
282    }
283
284    /* Language is mandatory */
285    if (!language) {
286        ERR_raise(ERR_LIB_X509V3,
287                  X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
288        goto err;
289    }
290    i = OBJ_obj2nid(language);
291    if ((i == NID_Independent || i == NID_id_ppl_inheritAll) && policy) {
292        ERR_raise(ERR_LIB_X509V3,
293                  X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
294        goto err;
295    }
296
297    pci = PROXY_CERT_INFO_EXTENSION_new();
298    if (pci == NULL) {
299        ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
300        goto err;
301    }
302
303    pci->proxyPolicy->policyLanguage = language;
304    language = NULL;
305    pci->proxyPolicy->policy = policy;
306    policy = NULL;
307    pci->pcPathLengthConstraint = pathlen;
308    pathlen = NULL;
309    goto end;
310 err:
311    ASN1_OBJECT_free(language);
312    ASN1_INTEGER_free(pathlen);
313    pathlen = NULL;
314    ASN1_OCTET_STRING_free(policy);
315    policy = NULL;
316    PROXY_CERT_INFO_EXTENSION_free(pci);
317    pci = NULL;
318 end:
319    sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
320    return pci;
321}
322