source4/auth/kerberos/kerberos.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    kerberos utility library
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Remus Koos 2001
   6    Copyright (C) Nalin Dahyabhai 2004.
   7    Copyright (C) Jeremy Allison 2004.
   8    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/kerberos.h"
  26 #include "auth/kerberos/kerberos.h"
  27
  28 #ifdef HAVE_KRB5
  29
  30 /*
  31   simulate a kinit, putting the tgt in the given credentials cache.
  32   Orignally by remus@snapserver.com
  33
  34   This version is built to use a keyblock, rather than needing the
  35   original password.
  36
  37   The impersonate_principal is the principal if NULL, or the principal to impersonate
  38
  39   The target_service defaults to the krbtgt if NULL, but could be kpasswd/realm or the local service (if we are doing s4u2self)
  40 */
  41  krb5_error_code kerberos_kinit_keyblock_cc(krb5_context ctx, krb5_ccache cc,
  42                                             krb5_principal principal, krb5_keyblock *keyblock,
  43                                             const char *target_service,
  44                                             krb5_get_init_creds_opt *krb_options,
  45                                             time_t *expire_time, time_t *kdc_time)
  46 {
  47         krb5_error_code code = 0;
  48         krb5_creds my_creds;
  49
  50         if ((code = krb5_get_init_creds_keyblock(ctx, &my_creds, principal, keyblock,
  51                                                  0, target_service, krb_options))) {
  52                 return code;
  53         }
  54
  55         if ((code = krb5_cc_initialize(ctx, cc, principal))) {
  56                 krb5_free_cred_contents(ctx, &my_creds);
  57                 return code;
  58         }
  59
  60         if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
  61                 krb5_free_cred_contents(ctx, &my_creds);
  62                 return code;
  63         }
  64
  65         if (expire_time) {
  66                 *expire_time = (time_t) my_creds.times.endtime;
  67         }
  68
  69         if (kdc_time) {
  70                 *kdc_time = (time_t) my_creds.times.starttime;
  71         }
  72
  73         krb5_free_cred_contents(ctx, &my_creds);
  74
  75         return 0;
  76 }
  77
  78 /*
  79   simulate a kinit, putting the tgt in the given credentials cache.
  80   Orignally by remus@snapserver.com
  81
  82   The impersonate_principal is the principal if NULL, or the principal to impersonate
  83
  84   The target_service defaults to the krbtgt if NULL, but could be kpasswd/realm or the local service (if we are doing s4u2self)
  85
  86 */
  87  krb5_error_code kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc,
  88                                             krb5_principal principal, const char *password,
  89                                             krb5_principal impersonate_principal, const char *target_service,
  90                                             krb5_get_init_creds_opt *krb_options,
  91                                             time_t *expire_time, time_t *kdc_time)
  92 {
  93         krb5_error_code code = 0;
  94         krb5_creds my_creds;
  95         krb5_creds *impersonate_creds;
  96         krb5_get_creds_opt options;
  97
  98         /* If we are not impersonating, then get this ticket for the
  99          * target service, otherwise a krbtgt, and get the next ticket
 100          * for the target */
 101         if ((code = krb5_get_init_creds_password(ctx, &my_creds, principal, password,
 102                                                  NULL, NULL,
 103                                                  0,
 104                                                  impersonate_principal ? NULL : target_service,
 105                                                  krb_options))) {
 106                 return code;
 107         }
 108
 109         if ((code = krb5_cc_initialize(ctx, cc, principal))) {
 110                 krb5_free_cred_contents(ctx, &my_creds);
 111                 return code;
 112         }
 113
 114         if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
 115                 krb5_free_cred_contents(ctx, &my_creds);
 116                 return code;
 117         }
 118
 119         if (expire_time) {
 120                 *expire_time = (time_t) my_creds.times.endtime;
 121         }
 122
 123         if (kdc_time) {
 124                 *kdc_time = (time_t) my_creds.times.starttime;
 125         }
 126
 127         krb5_free_cred_contents(ctx, &my_creds);
 128
 129         if (code == 0 && impersonate_principal) {
 130                 krb5_principal target_princ;
 131                 if ((code = krb5_get_creds_opt_alloc(ctx, &options))) {
 132                         return code;
 133                 }
 134
 135                 if ((code = krb5_get_creds_opt_set_impersonate(ctx, options, impersonate_principal))) {
 136                         krb5_get_creds_opt_free(ctx, options);
 137                         return code;
 138                 }
 139
 140                 if ((code = krb5_parse_name(ctx, target_service, &target_princ))) {
 141                         krb5_get_creds_opt_free(ctx, options);
 142                         return code;
 143                 }
 144
 145                 if ((code = krb5_principal_set_realm(ctx, target_princ, krb5_principal_get_realm(ctx, principal)))) {
 146                         krb5_get_creds_opt_free(ctx, options);
 147                         krb5_free_principal(ctx, target_princ);
 148                         return code;
 149                 }
 150
 151                 if ((code = krb5_get_creds(ctx, options, cc, target_princ, &impersonate_creds))) {
 152                         krb5_free_principal(ctx, target_princ);
 153                         krb5_get_creds_opt_free(ctx, options);
 154                         return code;
 155                 }
 156
 157                 krb5_free_principal(ctx, target_princ);
 158
 159                 code = krb5_cc_store_cred(ctx, cc, impersonate_creds);
 160                 krb5_get_creds_opt_free(ctx, options);
 161                 krb5_free_creds(ctx, impersonate_creds);
 162         }
 163
 164         return 0;
 165 }
 166
 167
 168 #endif