crypto/x509/v3_pci.c

   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 Högskolan
  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
  52 static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
  53                    BIO *out, int indent);
  54 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
  55                                           X509V3_CTX *ctx, char *str);
  56
  57 const 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
  67 static 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->data);
  81     return 1;
  82 }
  83
  84 static int process_pci_value(CONF_VALUE *val,
  85                              ASN1_OBJECT **language, ASN1_INTEGER **pathlen,
  86                              ASN1_OCTET_STRING **policy)
  87 {
  88     int free_policy = 0;
  89
  90     if (strcmp(val->name, "language") == 0) {
  91         if (*language) {
  92             ERR_raise(ERR_LIB_X509V3, X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
  93             X509V3_conf_err(val);
  94             return 0;
  95         }
  96         if ((*language = OBJ_txt2obj(val->value, 0)) == NULL) {
  97             ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_OBJECT_IDENTIFIER);
  98             X509V3_conf_err(val);
  99             return 0;
 100         }
 101     } else if (strcmp(val->name, "pathlen") == 0) {
 102         if (*pathlen) {
 103             ERR_raise(ERR_LIB_X509V3,
 104                       X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
 105             X509V3_conf_err(val);
 106             return 0;
 107         }
 108         if (!X509V3_get_value_int(val, pathlen)) {
 109             ERR_raise(ERR_LIB_X509V3, X509V3_R_POLICY_PATH_LENGTH);
 110             X509V3_conf_err(val);
 111             return 0;
 112         }
 113     } else if (strcmp(val->name, "policy") == 0) {
 114         unsigned char *tmp_data = NULL;
 115         long val_len;
 116
 117         if (*policy == NULL) {
 118             *policy = ASN1_OCTET_STRING_new();
 119             if (*policy == NULL) {
 120                 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 121                 X509V3_conf_err(val);
 122                 return 0;
 123             }
 124             free_policy = 1;
 125         }
 126         if (strncmp(val->value, "hex:", 4) == 0) {
 127             unsigned char *tmp_data2 =
 128                 OPENSSL_hexstr2buf(val->value + 4, &val_len);
 129
 130             if (!tmp_data2) {
 131                 X509V3_conf_err(val);
 132                 goto err;
 133             }
 134
 135             tmp_data = OPENSSL_realloc((*policy)->data,
 136                                        (*policy)->length + val_len + 1);
 137             if (tmp_data) {
 138                 (*policy)->data = tmp_data;
 139                 memcpy(&(*policy)->data[(*policy)->length],
 140                        tmp_data2, val_len);
 141                 (*policy)->length += val_len;
 142                 (*policy)->data[(*policy)->length] = '\0';
 143             } else {
 144                 OPENSSL_free(tmp_data2);
 145                 /*
 146                  * realloc failure implies the original data space is b0rked
 147                  * too!
 148                  */
 149                 OPENSSL_free((*policy)->data);
 150                 (*policy)->data = NULL;
 151                 (*policy)->length = 0;
 152                 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 153                 X509V3_conf_err(val);
 154                 goto err;
 155             }
 156             OPENSSL_free(tmp_data2);
 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                 ERR_raise(ERR_LIB_X509V3, 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 = OPENSSL_realloc((*policy)->data,
 172                                            (*policy)->length + n + 1);
 173
 174                 if (!tmp_data) {
 175                     OPENSSL_free((*policy)->data);
 176                     (*policy)->data = NULL;
 177                     (*policy)->length = 0;
 178                     ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 179                     X509V3_conf_err(val);
 180                     BIO_free_all(b);
 181                     goto err;
 182                 }
 183
 184                 (*policy)->data = tmp_data;
 185                 memcpy(&(*policy)->data[(*policy)->length], buf, n);
 186                 (*policy)->length += n;
 187                 (*policy)->data[(*policy)->length] = '\0';
 188             }
 189             BIO_free_all(b);
 190
 191             if (n < 0) {
 192                 ERR_raise(ERR_LIB_X509V3, ERR_R_BIO_LIB);
 193                 X509V3_conf_err(val);
 194                 goto err;
 195             }
 196         } else if (strncmp(val->value, "text:", 5) == 0) {
 197             val_len = strlen(val->value + 5);
 198             tmp_data = OPENSSL_realloc((*policy)->data,
 199                                        (*policy)->length + val_len + 1);
 200             if (tmp_data) {
 201                 (*policy)->data = tmp_data;
 202                 memcpy(&(*policy)->data[(*policy)->length],
 203                        val->value + 5, val_len);
 204                 (*policy)->length += val_len;
 205                 (*policy)->data[(*policy)->length] = '\0';
 206             } else {
 207                 /*
 208                  * realloc failure implies the original data space is b0rked
 209                  * too!
 210                  */
 211                 OPENSSL_free((*policy)->data);
 212                 (*policy)->data = NULL;
 213                 (*policy)->length = 0;
 214                 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 215                 X509V3_conf_err(val);
 216                 goto err;
 217             }
 218         } else {
 219             ERR_raise(ERR_LIB_X509V3, X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
 220             X509V3_conf_err(val);
 221             goto err;
 222         }
 223         if (!tmp_data) {
 224             ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 225             X509V3_conf_err(val);
 226             goto err;
 227         }
 228     }
 229     return 1;
 230  err:
 231     if (free_policy) {
 232         ASN1_OCTET_STRING_free(*policy);
 233         *policy = NULL;
 234     }
 235     return 0;
 236 }
 237
 238 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
 239                                           X509V3_CTX *ctx, char *value)
 240 {
 241     PROXY_CERT_INFO_EXTENSION *pci = NULL;
 242     STACK_OF(CONF_VALUE) *vals;
 243     ASN1_OBJECT *language = NULL;
 244     ASN1_INTEGER *pathlen = NULL;
 245     ASN1_OCTET_STRING *policy = NULL;
 246     int i, j;
 247
 248     vals = X509V3_parse_list(value);
 249     for (i = 0; i < sk_CONF_VALUE_num(vals); i++) {
 250         CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
 251
 252         if (!cnf->name || (*cnf->name != '@' && !cnf->value)) {
 253             ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_PROXY_POLICY_SETTING);
 254             X509V3_conf_err(cnf);
 255             goto err;
 256         }
 257         if (*cnf->name == '@') {
 258             STACK_OF(CONF_VALUE) *sect;
 259             int success_p = 1;
 260
 261             sect = X509V3_get_section(ctx, cnf->name + 1);
 262             if (!sect) {
 263                 ERR_raise(ERR_LIB_X509V3, X509V3_R_INVALID_SECTION);
 264                 X509V3_conf_err(cnf);
 265                 goto err;
 266             }
 267             for (j = 0; success_p && j < sk_CONF_VALUE_num(sect); j++) {
 268                 success_p =
 269                     process_pci_value(sk_CONF_VALUE_value(sect, j),
 270                                       &language, &pathlen, &policy);
 271             }
 272             X509V3_section_free(ctx, sect);
 273             if (!success_p)
 274                 goto err;
 275         } else {
 276             if (!process_pci_value(cnf, &language, &pathlen, &policy)) {
 277                 X509V3_conf_err(cnf);
 278                 goto err;
 279             }
 280         }
 281     }
 282
 283     /* Language is mandatory */
 284     if (!language) {
 285         ERR_raise(ERR_LIB_X509V3,
 286                   X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
 287         goto err;
 288     }
 289     i = OBJ_obj2nid(language);
 290     if ((i == NID_Independent || i == NID_id_ppl_inheritAll) && policy) {
 291         ERR_raise(ERR_LIB_X509V3,
 292                   X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
 293         goto err;
 294     }
 295
 296     pci = PROXY_CERT_INFO_EXTENSION_new();
 297     if (pci == NULL) {
 298         ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
 299         goto err;
 300     }
 301
 302     pci->proxyPolicy->policyLanguage = language;
 303     language = NULL;
 304     pci->proxyPolicy->policy = policy;
 305     policy = NULL;
 306     pci->pcPathLengthConstraint = pathlen;
 307     pathlen = NULL;
 308     goto end;
 309  err:
 310     ASN1_OBJECT_free(language);
 311     ASN1_INTEGER_free(pathlen);
 312     pathlen = NULL;
 313     ASN1_OCTET_STRING_free(policy);
 314     policy = NULL;
 315     PROXY_CERT_INFO_EXTENSION_free(pci);
 316     pci = NULL;
 317  end:
 318     sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
 319     return pci;
 320 }