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

   1 /* $OpenLDAP$ */
   2 /*
   3  * Copyright 1998-2006 The OpenLDAP Foundation.
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted only as authorized by the OpenLDAP
   8  * Public License.
   9  *
  10  * A copy of this license is available in the file LICENSE in the
  11  * top-level directory of the distribution or, alternatively, at
  12  * <http://www.OpenLDAP.org/license.html>.
  13  */
  14
  15 #include <unistd.h>
  16
  17 #include <lber.h>
  18 #include <lber_pvt.h>   /* BER_BVC definition */
  19 #include "lutil.h"
  20 #include <ac/string.h>
  21
  22 #ifdef HAVE_KRB5
  23 #include <krb5.h>
  24 #elif defined(HAVE_KRB4)
  25 #include <krb.h>
  26 #endif
  27
  28 /* From <ldap_pvt.h> */
  29 LDAP_F( char *) ldap_pvt_get_fqdn LDAP_P(( char * ));
  30
  31 static LUTIL_PASSWD_CHK_FUNC chk_kerberos;
  32 static const struct berval scheme = BER_BVC("{KERBEROS}");
  33
  34 static int chk_kerberos(
  35         const struct berval *sc,
  36         const struct berval * passwd,
  37         const struct berval * cred,
  38         const char **text )
  39 {
  40         unsigned int i;
  41         int rtn;
  42
  43         for( i=0; i<cred->bv_len; i++) {
  44                 if(cred->bv_val[i] == '\0') {
  45                         return LUTIL_PASSWD_ERR;        /* NUL character in password */
  46                 }
  47         }
  48
  49         if( cred->bv_val[i] != '\0' ) {
  50                 return LUTIL_PASSWD_ERR;        /* cred must behave like a string */
  51         }
  52
  53         for( i=0; i<passwd->bv_len; i++) {
  54                 if(passwd->bv_val[i] == '\0') {
  55                         return LUTIL_PASSWD_ERR;        /* NUL character in password */
  56                 }
  57         }
  58
  59         if( passwd->bv_val[i] != '\0' ) {
  60                 return LUTIL_PASSWD_ERR;        /* passwd must behave like a string */
  61         }
  62
  63         rtn = LUTIL_PASSWD_ERR;
  64
  65 #ifdef HAVE_KRB5 /* HAVE_HEIMDAL_KRB5 */
  66         {
  67 /* Portions:
  68  * Copyright (c) 1997, 1998, 1999 Kungliga Tekniska H\xf6gskolan
  69  * (Royal Institute of Technology, Stockholm, Sweden).
  70  * All rights reserved.
  71  *
  72  * Redistribution and use in source and binary forms, with or without
  73  * modification, are permitted provided that the following conditions
  74  * are met:
  75  *
  76  * 1. Redistributions of source code must retain the above copyright
  77  *    notice, this list of conditions and the following disclaimer.
  78  *
  79  * 2. Redistributions in binary form must reproduce the above copyright
  80  *    notice, this list of conditions and the following disclaimer in the
  81  *    documentation and/or other materials provided with the distribution.
  82  *
  83  * 3. Neither the name of the Institute nor the names of its contributors
  84  *    may be used to endorse or promote products derived from this software
  85  *    without specific prior written permission.
  86  *
  87  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  88  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  89  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  90  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  91  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  92  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  93  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  94  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  95  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  96  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  97  * SUCH DAMAGE.
  98  */
  99
 100                 krb5_context context;
 101                 krb5_error_code ret;
 102                 krb5_creds creds;
 103                 krb5_get_init_creds_opt get_options;
 104                 krb5_verify_init_creds_opt verify_options;
 105                 krb5_principal client, server;
 106 #ifdef notdef
 107                 krb5_preauthtype pre_auth_types[] = {KRB5_PADATA_ENC_TIMESTAMP};
 108 #endif
 109
 110                 ret = krb5_init_context( &context );
 111                 if (ret) {
 112                         return LUTIL_PASSWD_ERR;
 113                 }
 114
 115 #ifdef notdef
 116                 krb5_get_init_creds_opt_set_preauth_list(&get_options,
 117                         pre_auth_types, 1);
 118 #endif
 119
 120                 krb5_get_init_creds_opt_init( &get_options );
 121
 122                 krb5_verify_init_creds_opt_init( &verify_options );
 123
 124                 ret = krb5_parse_name( context, passwd->bv_val, &client );
 125
 126                 if (ret) {
 127                         krb5_free_context( context );
 128                         return LUTIL_PASSWD_ERR;
 129                 }
 130
 131                 ret = krb5_get_init_creds_password( context,
 132                         &creds, client, cred->bv_val, NULL,
 133                         NULL, 0, NULL, &get_options );
 134
 135                 if (ret) {
 136                         krb5_free_principal( context, client );
 137                         krb5_free_context( context );
 138                         return LUTIL_PASSWD_ERR;
 139                 }
 140
 141                 {
 142                         char *host = ldap_pvt_get_fqdn( NULL );
 143
 144                         if( host == NULL ) {
 145                                 krb5_free_principal( context, client );
 146                                 krb5_free_context( context );
 147                                 return LUTIL_PASSWD_ERR;
 148                         }
 149
 150                         ret = krb5_sname_to_principal( context,
 151                                 host, "ldap", KRB5_NT_SRV_HST, &server );
 152
 153                         ber_memfree( host );
 154                 }
 155
 156                 if (ret) {
 157                         krb5_free_principal( context, client );
 158                         krb5_free_context( context );
 159                         return LUTIL_PASSWD_ERR;
 160                 }
 161
 162                 ret = krb5_verify_init_creds( context,
 163                         &creds, server, NULL, NULL, &verify_options );
 164
 165                 krb5_free_principal( context, client );
 166                 krb5_free_principal( context, server );
 167                 krb5_free_cred_contents( context, &creds );
 168                 krb5_free_context( context );
 169
 170                 rtn = ret ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 171         }
 172 #elif   defined(HAVE_KRB4)
 173         {
 174                 /* Borrowed from Heimdal kpopper */
 175 /* Portions:
 176  * Copyright (c) 1989 Regents of the University of California.
 177  * All rights reserved.  The Berkeley software License Agreement
 178  * specifies the terms and conditions for redistribution.
 179  */
 180
 181                 int status;
 182                 char lrealm[REALM_SZ];
 183                 char tkt[MAXHOSTNAMELEN];
 184
 185                 status = krb_get_lrealm(lrealm,1);
 186                 if (status == KFAILURE) {
 187                         return LUTIL_PASSWD_ERR;
 188                 }
 189
 190                 snprintf(tkt, sizeof(tkt), "%s_slapd.%u",
 191                         TKT_ROOT, (unsigned)getpid());
 192                 krb_set_tkt_string (tkt);
 193
 194                 status = krb_verify_user( passwd->bv_val, "", lrealm,
 195                         cred->bv_val, 1, "ldap");
 196
 197                 dest_tkt(); /* no point in keeping the tickets */
 198
 199                 return status == KFAILURE ? LUTIL_PASSWD_ERR : LUTIL_PASSWD_OK;
 200         }
 201 #endif
 202
 203         return rtn;
 204 }
 205
 206 int init_module(int argc, char *argv[]) {
 207         return lutil_passwd_add( (struct berval *)&scheme, chk_kerberos, NULL );
 208 }