crypto/x509/v3_pci.c

   1 /*
   2  * Copyright 2004-2020 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 DEFINE_STACK_OF(CONF_VALUE)
  53
  54 static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
  55                    BIO *out, int indent);
  56 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
  57                                           X509V3_CTX *ctx, char *str);
  58
  59 const X509V3_EXT_METHOD v3_pci =
  60     { NID_proxyCertInfo, 0, ASN1_ITEM_ref(PROXY_CERT_INFO_EXTENSION),
  61     0, 0, 0, 0,
  62     0, 0,
  63     NULL, NULL,
  64     (X509V3_EXT_I2R)i2r_pci,
  65     (X509V3_EXT_R2I)r2i_pci,
  66     NULL,
  67 };
  68
  69 static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *pci,
  70                    BIO *out, int indent)
  71 {
  72     BIO_printf(out, "%*sPath Length Constraint: ", indent, "");
  73     if (pci->pcPathLengthConstraint)
  74         i2a_ASN1_INTEGER(out, pci->pcPathLengthConstraint);
  75     else
  76         BIO_printf(out, "infinite");
  77     BIO_puts(out, "\n");
  78     BIO_printf(out, "%*sPolicy Language: ", indent, "");
  79     i2a_ASN1_OBJECT(out, pci->proxyPolicy->policyLanguage);
  80     if (pci->proxyPolicy->policy && pci->proxyPolicy->policy->data)
  81         BIO_printf(out, "\n%*sPolicy Text: %s", indent, "",
  82                    pci->proxyPolicy->policy->data);
  83     return 1;
  84 }
  85
  86 static int process_pci_value(CONF_VALUE *val,
  87                              ASN1_OBJECT **language, ASN1_INTEGER **pathlen,
  88                              ASN1_OCTET_STRING **policy)
  89 {
  90     int free_policy = 0;
  91
  92     if (strcmp(val->name, "language") == 0) {
  93         if (*language) {
  94             X509V3err(X509V3_F_PROCESS_PCI_VALUE,
  95                       X509V3_R_POLICY_LANGUAGE_ALREADY_DEFINED);
  96             X509V3_conf_err(val);
  97             return 0;
  98         }
  99         if ((*language = OBJ_txt2obj(val->value, 0)) == NULL) {
 100             X509V3err(X509V3_F_PROCESS_PCI_VALUE,
 101                       X509V3_R_INVALID_OBJECT_IDENTIFIER);
 102             X509V3_conf_err(val);
 103             return 0;
 104         }
 105     } else if (strcmp(val->name, "pathlen") == 0) {
 106         if (*pathlen) {
 107             X509V3err(X509V3_F_PROCESS_PCI_VALUE,
 108                       X509V3_R_POLICY_PATH_LENGTH_ALREADY_DEFINED);
 109             X509V3_conf_err(val);
 110             return 0;
 111         }
 112         if (!X509V3_get_value_int(val, pathlen)) {
 113             X509V3err(X509V3_F_PROCESS_PCI_VALUE,
 114                       X509V3_R_POLICY_PATH_LENGTH);
 115             X509V3_conf_err(val);
 116             return 0;
 117         }
 118     } else if (strcmp(val->name, "policy") == 0) {
 119         unsigned char *tmp_data = NULL;
 120         long val_len;
 121
 122         if (*policy == NULL) {
 123             *policy = ASN1_OCTET_STRING_new();
 124             if (*policy == NULL) {
 125                 X509V3err(X509V3_F_PROCESS_PCI_VALUE, ERR_R_MALLOC_FAILURE);
 126                 X509V3_conf_err(val);
 127                 return 0;
 128             }
 129             free_policy = 1;
 130         }
 131         if (strncmp(val->value, "hex:", 4) == 0) {
 132             unsigned char *tmp_data2 =
 133                 OPENSSL_hexstr2buf(val->value + 4, &val_len);
 134
 135             if (!tmp_data2) {
 136                 X509V3_conf_err(val);
 137                 goto err;
 138             }
 139
 140             tmp_data = OPENSSL_realloc((*policy)->data,
 141                                        (*policy)->length + val_len + 1);
 142             if (tmp_data) {
 143                 (*policy)->data = tmp_data;
 144                 memcpy(&(*policy)->data[(*policy)->length],
 145                        tmp_data2, val_len);
 146                 (*policy)->length += val_len;
 147                 (*policy)->data[(*policy)->length] = '\0';
 148             } else {
 149                 OPENSSL_free(tmp_data2);
 150                 /*
 151                  * realloc failure implies the original data space is b0rked
 152                  * too!
 153                  */
 154                 OPENSSL_free((*policy)->data);
 155                 (*policy)->data = NULL;
 156                 (*policy)->length = 0;
 157                 X509V3err(X509V3_F_PROCESS_PCI_VALUE, ERR_R_MALLOC_FAILURE);
 158                 X509V3_conf_err(val);
 159                 goto err;
 160             }
 161             OPENSSL_free(tmp_data2);
 162         } else if (strncmp(val->value, "file:", 5) == 0) {
 163             unsigned char buf[2048];
 164             int n;
 165             BIO *b = BIO_new_file(val->value + 5, "r");
 166             if (!b) {
 167                 X509V3err(X509V3_F_PROCESS_PCI_VALUE, ERR_R_BIO_LIB);
 168                 X509V3_conf_err(val);
 169                 goto err;
 170             }
 171             while ((n = BIO_read(b, buf, sizeof(buf))) > 0
 172                    || (n == 0 && BIO_should_retry(b))) {
 173                 if (!n)
 174                     continue;
 175
 176                 tmp_data = OPENSSL_realloc((*policy)->data,
 177                                            (*policy)->length + n + 1);
 178
 179                 if (!tmp_data) {
 180                     OPENSSL_free((*policy)->data);
 181                     (*policy)->data = NULL;
 182                     (*policy)->length = 0;
 183                     X509V3err(X509V3_F_PROCESS_PCI_VALUE,
 184                               ERR_R_MALLOC_FAILURE);
 185                     X509V3_conf_err(val);
 186                     BIO_free_all(b);
 187                     goto err;
 188                 }
 189
 190                 (*policy)->data = tmp_data;
 191                 memcpy(&(*policy)->data[(*policy)->length], buf, n);
 192                 (*policy)->length += n;
 193                 (*policy)->data[(*policy)->length] = '\0';
 194             }
 195             BIO_free_all(b);
 196
 197             if (n < 0) {
 198                 X509V3err(X509V3_F_PROCESS_PCI_VALUE, ERR_R_BIO_LIB);
 199                 X509V3_conf_err(val);
 200                 goto err;
 201             }
 202         } else if (strncmp(val->value, "text:", 5) == 0) {
 203             val_len = strlen(val->value + 5);
 204             tmp_data = OPENSSL_realloc((*policy)->data,
 205                                        (*policy)->length + val_len + 1);
 206             if (tmp_data) {
 207                 (*policy)->data = tmp_data;
 208                 memcpy(&(*policy)->data[(*policy)->length],
 209                        val->value + 5, val_len);
 210                 (*policy)->length += val_len;
 211                 (*policy)->data[(*policy)->length] = '\0';
 212             } else {
 213                 /*
 214                  * realloc failure implies the original data space is b0rked
 215                  * too!
 216                  */
 217                 OPENSSL_free((*policy)->data);
 218                 (*policy)->data = NULL;
 219                 (*policy)->length = 0;
 220                 X509V3err(X509V3_F_PROCESS_PCI_VALUE, ERR_R_MALLOC_FAILURE);
 221                 X509V3_conf_err(val);
 222                 goto err;
 223             }
 224         } else {
 225             X509V3err(X509V3_F_PROCESS_PCI_VALUE,
 226                       X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
 227             X509V3_conf_err(val);
 228             goto err;
 229         }
 230         if (!tmp_data) {
 231             X509V3err(X509V3_F_PROCESS_PCI_VALUE, ERR_R_MALLOC_FAILURE);
 232             X509V3_conf_err(val);
 233             goto err;
 234         }
 235     }
 236     return 1;
 237  err:
 238     if (free_policy) {
 239         ASN1_OCTET_STRING_free(*policy);
 240         *policy = NULL;
 241     }
 242     return 0;
 243 }
 244
 245 static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
 246                                           X509V3_CTX *ctx, char *value)
 247 {
 248     PROXY_CERT_INFO_EXTENSION *pci = NULL;
 249     STACK_OF(CONF_VALUE) *vals;
 250     ASN1_OBJECT *language = NULL;
 251     ASN1_INTEGER *pathlen = NULL;
 252     ASN1_OCTET_STRING *policy = NULL;
 253     int i, j;
 254
 255     vals = X509V3_parse_list(value);
 256     for (i = 0; i < sk_CONF_VALUE_num(vals); i++) {
 257         CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
 258         if (!cnf->name || (*cnf->name != '@' && !cnf->value)) {
 259             X509V3err(X509V3_F_R2I_PCI,
 260                       X509V3_R_INVALID_PROXY_POLICY_SETTING);
 261             X509V3_conf_err(cnf);
 262             goto err;
 263         }
 264         if (*cnf->name == '@') {
 265             STACK_OF(CONF_VALUE) *sect;
 266             int success_p = 1;
 267
 268             sect = X509V3_get_section(ctx, cnf->name + 1);
 269             if (!sect) {
 270                 X509V3err(X509V3_F_R2I_PCI, X509V3_R_INVALID_SECTION);
 271                 X509V3_conf_err(cnf);
 272                 goto err;
 273             }
 274             for (j = 0; success_p && j < sk_CONF_VALUE_num(sect); j++) {
 275                 success_p =
 276                     process_pci_value(sk_CONF_VALUE_value(sect, j),
 277                                       &language, &pathlen, &policy);
 278             }
 279             X509V3_section_free(ctx, sect);
 280             if (!success_p)
 281                 goto err;
 282         } else {
 283             if (!process_pci_value(cnf, &language, &pathlen, &policy)) {
 284                 X509V3_conf_err(cnf);
 285                 goto err;
 286             }
 287         }
 288     }
 289
 290     /* Language is mandatory */
 291     if (!language) {
 292         X509V3err(X509V3_F_R2I_PCI,
 293                   X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
 294         goto err;
 295     }
 296     i = OBJ_obj2nid(language);
 297     if ((i == NID_Independent || i == NID_id_ppl_inheritAll) && policy) {
 298         X509V3err(X509V3_F_R2I_PCI,
 299                   X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
 300         goto err;
 301     }
 302
 303     pci = PROXY_CERT_INFO_EXTENSION_new();
 304     if (pci == NULL) {
 305         X509V3err(X509V3_F_R2I_PCI, ERR_R_MALLOC_FAILURE);
 306         goto err;
 307     }
 308
 309     pci->proxyPolicy->policyLanguage = language;
 310     language = NULL;
 311     pci->proxyPolicy->policy = policy;
 312     policy = NULL;
 313     pci->pcPathLengthConstraint = pathlen;
 314     pathlen = NULL;
 315     goto end;
 316  err:
 317     ASN1_OBJECT_free(language);
 318     ASN1_INTEGER_free(pathlen);
 319     pathlen = NULL;
 320     ASN1_OCTET_STRING_free(policy);
 321     policy = NULL;
 322     PROXY_CERT_INFO_EXTENSION_free(pci);
 323     pci = NULL;
 324  end:
 325     sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
 326     return pci;
 327 }