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v3_pci.c

/* v3_pci.c -*- mode:C; c-file-style: "eay" -*- */
/* Contributed to the OpenSSL Project 2004
 * by Richard Levitte (richard@levitte.org)
 */
/* Copyright (c) 2004 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>
#include "cryptlib.h"
#include <openssl/conf.h>
#include <openssl/x509v3.h>

static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *ext,
      BIO *out, int indent);
static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
      X509V3_CTX *ctx, char *str);

const X509V3_EXT_METHOD v3_pci =
      { NID_proxyCertInfo, 0, ASN1_ITEM_ref(PROXY_CERT_INFO_EXTENSION),
        0,0,0,0,
        0,0,
        NULL, NULL,
        (X509V3_EXT_I2R)i2r_pci,
        (X509V3_EXT_R2I)r2i_pci,
        NULL,
      };

static int i2r_pci(X509V3_EXT_METHOD *method, PROXY_CERT_INFO_EXTENSION *pci,
      BIO *out, int indent)
      {
      BIO_printf(out, "%*sPath Length Constraint: ", indent, "");
      if (pci->pcPathLengthConstraint)
        i2a_ASN1_INTEGER(out, pci->pcPathLengthConstraint);
      else
        BIO_printf(out, "infinite");
      BIO_puts(out, "\n");
      BIO_printf(out, "%*sPolicy Language: ", indent, "");
      i2a_ASN1_OBJECT(out, pci->proxyPolicy->policyLanguage);
      BIO_puts(out, "\n");
      if (pci->proxyPolicy->policy && pci->proxyPolicy->policy->data)
        BIO_printf(out, "%*sPolicy Text: %s\n", indent, "",
                 pci->proxyPolicy->policy->data);
      return 1;
      }

static int process_pci_value(CONF_VALUE *val,
      ASN1_OBJECT **language, ASN1_INTEGER **pathlen,
      ASN1_OCTET_STRING **policy)
      {
      int free_policy = 0;

      if (strcmp(val->name, "language") == 0)
            {
            if (*language)
                  {
                  X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_POLICY_LANGUAGE_ALREADTY_DEFINED);
                  X509V3_conf_err(val);
                  return 0;
                  }
            if (!(*language = OBJ_txt2obj(val->value, 0)))
                  {
                  X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_INVALID_OBJECT_IDENTIFIER);
                  X509V3_conf_err(val);
                  return 0;
                  }
            }
      else if (strcmp(val->name, "pathlen") == 0)
            {
            if (*pathlen)
                  {
                  X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_POLICY_PATH_LENGTH_ALREADTY_DEFINED);
                  X509V3_conf_err(val);
                  return 0;
                  }
            if (!X509V3_get_value_int(val, pathlen))
                  {
                  X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_POLICY_PATH_LENGTH);
                  X509V3_conf_err(val);
                  return 0;
                  }
            }
      else if (strcmp(val->name, "policy") == 0)
            {
            unsigned char *tmp_data = NULL;
            long val_len;
            if (!*policy)
                  {
                  *policy = ASN1_OCTET_STRING_new();
                  if (!*policy)
                        {
                        X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                        X509V3_conf_err(val);
                        return 0;
                        }
                  free_policy = 1;
                  }
            if (strncmp(val->value, "hex:", 4) == 0)
                  {
                  unsigned char *tmp_data2 =
                        string_to_hex(val->value + 4, &val_len);

                  if (!tmp_data2) 
                        {
                        X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_ILLEGAL_HEX_DIGIT);
                        X509V3_conf_err(val);
                        goto err;
                        }

                  tmp_data = OPENSSL_realloc((*policy)->data,
                        (*policy)->length + val_len + 1);
                  if (tmp_data)
                        {
                        (*policy)->data = tmp_data;
                        memcpy(&(*policy)->data[(*policy)->length],
                              tmp_data2, val_len);
                        (*policy)->length += val_len;
                        (*policy)->data[(*policy)->length] = '\0';
                        }
                  else
                        {
                        OPENSSL_free(tmp_data2);
                        /* realloc failure implies the original data space is b0rked too! */
                        (*policy)->data = NULL;
                        (*policy)->length = 0;
                        X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                        X509V3_conf_err(val);
                        goto err;
                        }
                  OPENSSL_free(tmp_data2);
                  }
            else if (strncmp(val->value, "file:", 5) == 0)
                  {
                  unsigned char buf[2048];
                  int n;
                  BIO *b = BIO_new_file(val->value + 5, "r");
                  if (!b)
                        {
                        X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_BIO_LIB);
                        X509V3_conf_err(val);
                        goto err;
                        }
                  while((n = BIO_read(b, buf, sizeof(buf))) > 0
                        || (n == 0 && BIO_should_retry(b)))
                        {
                        if (!n) continue;

                        tmp_data = OPENSSL_realloc((*policy)->data,
                              (*policy)->length + n + 1);

                        if (!tmp_data)
                              break;

                        (*policy)->data = tmp_data;
                        memcpy(&(*policy)->data[(*policy)->length],
                              buf, n);
                        (*policy)->length += n;
                        (*policy)->data[(*policy)->length] = '\0';
                        }
                  BIO_free_all(b);

                  if (n < 0)
                        {
                        X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_BIO_LIB);
                        X509V3_conf_err(val);
                        goto err;
                        }
                  }
            else if (strncmp(val->value, "text:", 5) == 0)
                  {
                  val_len = strlen(val->value + 5);
                  tmp_data = OPENSSL_realloc((*policy)->data,
                        (*policy)->length + val_len + 1);
                  if (tmp_data)
                        {
                        (*policy)->data = tmp_data;
                        memcpy(&(*policy)->data[(*policy)->length],
                              val->value + 5, val_len);
                        (*policy)->length += val_len;
                        (*policy)->data[(*policy)->length] = '\0';
                        }
                  else
                        {
                        /* realloc failure implies the original data space is b0rked too! */
                        (*policy)->data = NULL;
                        (*policy)->length = 0;
                        X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                        X509V3_conf_err(val);
                        goto err;
                        }
                  }
            else
                  {
                  X509V3err(X509V3_F_PROCESS_PCI_VALUE,X509V3_R_INCORRECT_POLICY_SYNTAX_TAG);
                  X509V3_conf_err(val);
                  goto err;
                  }
            if (!tmp_data)
                  {
                  X509V3err(X509V3_F_PROCESS_PCI_VALUE,ERR_R_MALLOC_FAILURE);
                  X509V3_conf_err(val);
                  goto err;
                  }
            }
      return 1;
err:
      if (free_policy)
            {
            ASN1_OCTET_STRING_free(*policy);
            *policy = NULL;
            }
      return 0;
      }

static PROXY_CERT_INFO_EXTENSION *r2i_pci(X509V3_EXT_METHOD *method,
      X509V3_CTX *ctx, char *value)
      {
      PROXY_CERT_INFO_EXTENSION *pci = NULL;
      STACK_OF(CONF_VALUE) *vals;
      ASN1_OBJECT *language = NULL;
      ASN1_INTEGER *pathlen = NULL;
      ASN1_OCTET_STRING *policy = NULL;
      int i, j;

      vals = X509V3_parse_list(value);
      for (i = 0; i < sk_CONF_VALUE_num(vals); i++)
            {
            CONF_VALUE *cnf = sk_CONF_VALUE_value(vals, i);
            if (!cnf->name || (*cnf->name != '@' && !cnf->value))
                  {
                  X509V3err(X509V3_F_R2I_PCI,X509V3_R_INVALID_PROXY_POLICY_SETTING);
                  X509V3_conf_err(cnf);
                  goto err;
                  }
            if (*cnf->name == '@')
                  {
                  STACK_OF(CONF_VALUE) *sect;
                  int success_p = 1;

                  sect = X509V3_get_section(ctx, cnf->name + 1);
                  if (!sect)
                        {
                        X509V3err(X509V3_F_R2I_PCI,X509V3_R_INVALID_SECTION);
                        X509V3_conf_err(cnf);
                        goto err;
                        }
                  for (j = 0; success_p && j < sk_CONF_VALUE_num(sect); j++)
                        {
                        success_p =
                              process_pci_value(sk_CONF_VALUE_value(sect, j),
                                    &language, &pathlen, &policy);
                        }
                  X509V3_section_free(ctx, sect);
                  if (!success_p)
                        goto err;
                  }
            else
                  {
                  if (!process_pci_value(cnf,
                              &language, &pathlen, &policy))
                        {
                        X509V3_conf_err(cnf);
                        goto err;
                        }
                  }
            }

      /* Language is mandatory */
      if (!language)
            {
            X509V3err(X509V3_F_R2I_PCI,X509V3_R_NO_PROXY_CERT_POLICY_LANGUAGE_DEFINED);
            goto err;
            }
      i = OBJ_obj2nid(language);
      if ((i == NID_Independent || i == NID_id_ppl_inheritAll) && policy)
            {
            X509V3err(X509V3_F_R2I_PCI,X509V3_R_POLICY_WHEN_PROXY_LANGUAGE_REQUIRES_NO_POLICY);
            goto err;
            }

      pci = PROXY_CERT_INFO_EXTENSION_new();
      if (!pci)
            {
            X509V3err(X509V3_F_R2I_PCI,ERR_R_MALLOC_FAILURE);
            goto err;
            }

      pci->proxyPolicy->policyLanguage = language; language = NULL;
      pci->proxyPolicy->policy = policy; policy = NULL;
      pci->pcPathLengthConstraint = pathlen; pathlen = NULL;
      goto end;
err:
      if (language) { ASN1_OBJECT_free(language); language = NULL; }
      if (pathlen) { ASN1_INTEGER_free(pathlen); pathlen = NULL; }
      if (policy) { ASN1_OCTET_STRING_free(policy); policy = NULL; }
      if (pci) { PROXY_CERT_INFO_EXTENSION_free(pci); pci = NULL; }
end:
      sk_CONF_VALUE_pop_free(vals, X509V3_conf_free);
      return pci;
      }

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