lib/krb5/sock_principal.c

   1 /*
   2  * Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #include "krb5_locl.h"
  35
  36 KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
  37 krb5_sock_to_principal (krb5_context context,
  38                         int sock,
  39                         const char *sname,
  40                         int32_t type,
  41                         krb5_principal *ret_princ)
  42 {
  43     krb5_error_code ret;
  44     struct sockaddr_storage __ss;
  45     struct sockaddr *sa = (struct sockaddr *)&__ss;
  46     socklen_t salen = sizeof(__ss);
  47     char hostname[NI_MAXHOST];
  48
  49     if (krb5_config_get_bool(context, NULL, "libdefaults", "block_dns",
  50             NULL)) {
  51         ret = HEIM_EAI_FAIL;
  52         krb5_set_error_message (context, ret,
  53                                 "krb5_sock_to_principal: block_dns enabled");
  54         return ret;
  55     }
  56
  57     if (getsockname (sock, sa, &salen) < 0) {
  58         ret = errno;
  59         krb5_set_error_message (context, ret, "getsockname: %s", strerror(ret));
  60         return ret;
  61     }
  62     ret = getnameinfo (sa, salen, hostname, sizeof(hostname), NULL, 0, 0);
  63     if (ret) {
  64         int save_errno = errno;
  65         krb5_error_code ret2 = krb5_eai_to_heim_errno(ret, save_errno);
  66         krb5_set_error_message (context, ret2, "getnameinfo: %s", gai_strerror(ret));
  67         return ret2;
  68     }
  69
  70     ret = krb5_sname_to_principal (context,
  71                                    hostname,
  72                                    sname,
  73                                    type,
  74                                    ret_princ);
  75     return ret;
  76 }