crypto/heimdal/lib/gssapi/mech/gss_pname_to_uid.c

   1 /*
   2  * Copyright (c) 2011, PADL Software Pty Ltd.
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  *
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  *
  16  * 3. Neither the name of PADL Software nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY PADL SOFTWARE AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL PADL SOFTWARE OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #include "mech_locl.h"
  34
  35 static OM_uint32
  36 mech_pname_to_uid(OM_uint32 *minor_status,
  37                   struct _gss_mechanism_name *mn,
  38                   uid_t *uidp)
  39 {
  40     OM_uint32 major_status = GSS_S_UNAVAILABLE;
  41
  42     *minor_status = 0;
  43
  44     if (mn->gmn_mech->gm_pname_to_uid == NULL)
  45         return GSS_S_UNAVAILABLE;
  46
  47     major_status = mn->gmn_mech->gm_pname_to_uid(minor_status,
  48                                                  mn->gmn_name,
  49                                                  mn->gmn_mech_oid,
  50                                                  uidp);
  51     if (GSS_ERROR(major_status))
  52         _gss_mg_error(mn->gmn_mech, major_status, *minor_status);
  53
  54     return major_status;
  55 }
  56
  57 static OM_uint32
  58 attr_pname_to_uid(OM_uint32 *minor_status,
  59                   struct _gss_mechanism_name *mn,
  60                   uid_t *uidp)
  61 {
  62 #ifdef NO_LOCALNAME
  63     return GSS_S_UNAVAILABLE;
  64 #else
  65     OM_uint32 major_status = GSS_S_UNAVAILABLE;
  66     OM_uint32 tmpMinor;
  67     int more = -1;
  68
  69     *minor_status = 0;
  70
  71     if (mn->gmn_mech->gm_get_name_attribute == NULL)
  72         return GSS_S_UNAVAILABLE;
  73
  74     while (more != 0) {
  75         gss_buffer_desc value;
  76         gss_buffer_desc display_value;
  77         int authenticated = 0, complete = 0;
  78 #ifdef POSIX_GETPWNAM_R
  79         char pwbuf[2048];
  80         struct passwd pw, *pwd;
  81 #else
  82         struct passwd *pwd;
  83 #endif
  84         char *localname;
  85
  86         major_status = mn->gmn_mech->gm_get_name_attribute(minor_status,
  87                                                            mn->gmn_name,
  88                                                            GSS_C_ATTR_LOCAL_LOGIN_USER,
  89                                                            &authenticated,
  90                                                            &complete,
  91                                                            &value,
  92                                                            &display_value,
  93                                                            &more);
  94         if (GSS_ERROR(major_status)) {
  95             _gss_mg_error(mn->gmn_mech, major_status, *minor_status);
  96             break;
  97         }
  98
  99         localname = malloc(value.length + 1);
 100         if (localname == NULL) {
 101             major_status = GSS_S_FAILURE;
 102             *minor_status = ENOMEM;
 103             break;
 104         }
 105
 106         memcpy(localname, value.value, value.length);
 107         localname[value.length] = '\0';
 108
 109 #ifdef POSIX_GETPWNAM_R
 110         if (getpwnam_r(localname, &pw, pwbuf, sizeof(pwbuf), &pwd) != 0)
 111             pwd = NULL;
 112 #else
 113         pwd = getpwnam(localname);
 114 #endif
 115
 116         free(localname);
 117         gss_release_buffer(&tmpMinor, &value);
 118         gss_release_buffer(&tmpMinor, &display_value);
 119
 120         if (pwd != NULL) {
 121             *uidp = pwd->pw_uid;
 122             major_status = GSS_S_COMPLETE;
 123             *minor_status = 0;
 124             break;
 125         } else
 126             major_status = GSS_S_UNAVAILABLE;
 127     }
 128
 129     return major_status;
 130 #endif /* NO_LOCALNAME */
 131 }
 132
 133 GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
 134 gss_pname_to_uid(OM_uint32 *minor_status,
 135                  const gss_name_t pname,
 136                  const gss_OID mech_type,
 137                  uid_t *uidp)
 138 {
 139     OM_uint32 major_status = GSS_S_UNAVAILABLE;
 140     struct _gss_name *name = (struct _gss_name *) pname;
 141     struct _gss_mechanism_name *mn = NULL;
 142
 143     *minor_status = 0;
 144
 145     if (mech_type != GSS_C_NO_OID) {
 146         major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
 147         if (GSS_ERROR(major_status))
 148             return major_status;
 149
 150         major_status = mech_pname_to_uid(minor_status, mn, uidp);
 151         if (major_status != GSS_S_COMPLETE)
 152             major_status = attr_pname_to_uid(minor_status, mn, uidp);
 153     } else {
 154         HEIM_SLIST_FOREACH(mn, &name->gn_mn, gmn_link) {
 155             major_status = mech_pname_to_uid(minor_status, mn, uidp);
 156             if (major_status != GSS_S_COMPLETE)
 157                 major_status = attr_pname_to_uid(minor_status, mn, uidp);
 158             if (major_status != GSS_S_UNAVAILABLE)
 159                 break;
 160         }
 161     }
 162
 163     if (major_status != GSS_S_COMPLETE && mn != NULL)
 164         _gss_mg_error(mn->gmn_mech, major_status, *minor_status);
 165
 166     return major_status;
 167 }