git.sur5r.net Git - openldap/blob - contrib/slapd-modules/passwd/kerberos.c

   1 /* $OpenLDAP$ */
   2 /* This work is part of OpenLDAP Software <http://www.openldap.org/>.
   3  *
   4  * Copyright 1998-2017 The OpenLDAP Foundation.
   5  * All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted only as authorized by the OpenLDAP
   9  * Public License.
  10  *
  11  * A copy of this license is available in the file LICENSE in the
  12  * top-level directory of the distribution or, alternatively, at
  13  * <http://www.OpenLDAP.org/license.html>.
  14  */
  15
  16 #include <unistd.h>
  17
  18 #include <lber.h>
  19 #include <lber_pvt.h>   /* BER_BVC definition */
  20 #include "lutil.h"
  21 #include <ac/string.h>
  22
  23 #ifdef HAVE_KRB5
  24 #include <krb5.h>
  25 #elif defined(HAVE_KRB4)
  26 #include <krb.h>
  27 #endif
  28
  29 /* From <ldap_pvt.h> */
  30 LDAP_F( char *) ldap_pvt_get_fqdn LDAP_P(( char * ));
  31
  32 static LUTIL_PASSWD_CHK_FUNC chk_kerberos;
  33 static const struct berval scheme = BER_BVC("{KERBEROS}");
  34
  35 static int chk_kerberos(
  36         const struct berval *sc,
  37         const struct berval * passwd,
  38         const struct berval * cred,
  39         const char **text )
  40 {
  41         unsigned int i;
  42         int rtn;
  43
  44         for( i=0; i<cred->bv_len; i++) {
  45                 if(cred->bv_val[i] == '\0') {
  46                         return LUTIL_PASSWD_ERR;        /* NUL character in password */
  47                 }
  48         }
  49
  50         if( cred->bv_val[i] != '\0' ) {
  51                 return LUTIL_PASSWD_ERR;        /* cred must behave like a string */
  52         }
  53
  54         for( i=0; i<passwd->bv_len; i++) {
  55                 if(passwd->bv_val[i] == '\0') {
  56                         return LUTIL_PASSWD_ERR;        /* NUL character in password */
  57                 }
  58         }
  59
  60         if( passwd->bv_val[i] != '\0' ) {
  61                 return LUTIL_PASSWD_ERR;        /* passwd must behave like a string */
  62         }
  63
  64         rtn = LUTIL_PASSWD_ERR;
  65
  66 #ifdef HAVE_KRB5 /* HAVE_HEIMDAL_KRB5 */
  67         {
  68 /* Portions:
  69  * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska H\xf6gskolan
  70  * (Royal Institute of Technology, Stockholm, Sweden).
  71  * All rights reserved.
  72  *
  73  * Redistribution and use in source and binary forms, with or without
  74  * modification, are permitted provided that the following conditions
  75  * are met:
  76  *
  77  * 1. Redistributions of source code must retain the above copyright
  78  *    notice, this list of conditions and the following disclaimer.
  79  *
  80  * 2. Redistributions in binary form must reproduce the above copyright
  81  *    notice, this list of conditions and the following disclaimer in the
  82  *    documentation and/or other materials provided with the distribution.
  83  *
  84  * 3. Neither the name of the Institute nor the names of its contributors
  85  *    may be used to endorse or promote products derived from this software
  86  *    without specific prior written permission.
  87  *
  88  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  89  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  90  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  91  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  92  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  93  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  94  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  95  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  96  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  97  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  98  * SUCH DAMAGE.
  99  */
 100
 101                 krb5_context context;
 102                 krb5_error_code ret;
 103                 krb5_creds creds;
 104                 krb5_get_init_creds_opt get_options;
 105                 krb5_verify_init_creds_opt verify_options;
 106                 krb5_principal client, server;
 107 #ifdef notdef
 108                 krb5_preauthtype pre_auth_types[] = {KRB5_PADATA_ENC_TIMESTAMP};
 109 #endif
 110
 111                 ret = krb5_init_context( &context );
 112                 if (ret) {
 113                         return LUTIL_PASSWD_ERR;
 114                 }
 115
 116 #ifdef notdef
 117                 krb5_get_init_creds_opt_set_preauth_list(&get_options,
 118                         pre_auth_types, 1);
 119 #endif
 120
 121                 krb5_get_init_creds_opt_init( &get_options );
 122
 123                 krb5_verify_init_creds_opt_init( &verify_options );
 124
 125                 ret = krb5_parse_name( context, passwd->bv_val, &client );
 126
 127                 if (ret) {
 128                         krb5_free_context( context );
 129                         return LUTIL_PASSWD_ERR;
 130                 }
 131
 132                 ret = krb5_get_init_creds_password( context,
 133                         &creds, client, cred->bv_val, NULL,
 134                         NULL, 0, NULL, &get_options );
 135
 136                 if (ret) {
 137                         krb5_free_principal( context, client );
 138                         krb5_free_context( context );
 139                         return LUTIL_PASSWD_ERR;
 140                 }
 141
 142                 {
 143                         char *host = ldap_pvt_get_fqdn( NULL );
 144
 145                         if( host == NULL ) {
 146                                 krb5_free_principal( context, client );
 147                                 krb5_free_context( context );
 148                                 return LUTIL_PASSWD_ERR;
 149                         }
 150
 151                         ret = krb5_sname_to_principal( context,
 152                                 host, "ldap", KRB5_NT_SRV_HST, &server );
 153
 154                         ber_memfree( host );
 155                 }
 156
 157                 if (ret) {
 158                         krb5_free_principal( context, client );
 159                         krb5_free_context( context );
 160                         return LUTIL_PASSWD_ERR;
 161                 }
 162
 163                 ret = krb5_verify_init_creds( context,
 164                         &creds, server, NULL, NULL, &verify_options );
 165
 166                 krb5_free_principal( context, client );
 167                 krb5_free_principal( context, server );
 168                 krb5_free_cred_contents( context, &creds );
 169                 krb5_free_context( context );
 170
 171                 rtn = ret ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 172         }
 173 #elif   defined(HAVE_KRB4)
 174         {
 175                 /* Borrowed from Heimdal kpopper */
 176 /* Portions:
 177  * Copyright (c) 1989 Regents of the University of California.
 178  * All rights reserved.  The Berkeley software License Agreement
 179  * specifies the terms and conditions for redistribution.
 180  */
 181
 182                 int status;
 183                 char lrealm[REALM_SZ];
 184                 char tkt[MAXHOSTNAMELEN];
 185
 186                 status = krb_get_lrealm(lrealm,1);
 187                 if (status == KFAILURE) {
 188                         return LUTIL_PASSWD_ERR;
 189                 }
 190
 191                 snprintf(tkt, sizeof(tkt), "%s_slapd.%u",
 192                         TKT_ROOT, (unsigned)getpid());
 193                 krb_set_tkt_string (tkt);
 194
 195                 status = krb_verify_user( passwd->bv_val, "", lrealm,
 196                         cred->bv_val, 1, "ldap");
 197
 198                 dest_tkt(); /* no point in keeping the tickets */
 199
 200                 return status == KFAILURE ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 201         }
 202 #endif
 203
 204         return rtn;
 205 }
 206
 207 int init_module(int argc, char *argv[]) {
 208         return lutil_passwd_add( (struct berval *)&scheme, chk_kerberos, NULL );
 209 }