source/libsmb/clikrb5.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    simple kerberos5 routines for active directory
   4    Copyright (C) Andrew Tridgell 2001
   5    Copyright (C) Luke Howard 2002
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #ifdef HAVE_KRB5
  25
  26 #ifndef HAVE_KRB5_SET_REAL_TIME
  27 /*
  28  * This function is not in the Heimdal mainline.
  29  */
  30 krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
  31 {
  32         krb5_error_code ret;
  33         int32_t sec, usec;
  34
  35         ret = krb5_us_timeofday(context, &sec, &usec);
  36         if (ret)
  37                 return ret;
  38
  39         context->kdc_sec_offset = seconds - sec;
  40         context->kdc_usec_offset = microseconds - usec;
  41
  42         return 0;
  43 }
  44 #endif
  45
  46 #if defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES) && !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  47 krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  48 {
  49         return krb5_set_default_in_tkt_etypes(ctx, enc);
  50 }
  51 #endif
  52
  53 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  54 /* HEIMDAL */
  55 void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
  56 {
  57         pkaddr->addr_type = KRB5_ADDRESS_INET;
  58         pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
  59         pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
  60 }
  61 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
  62 /* MIT */
  63 void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
  64 {
  65         pkaddr->addrtype = ADDRTYPE_INET;
  66         pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
  67         pkaddr->contents = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
  68 }
  69 #else
  70 __ERROR__XX__UNKNOWN_ADDRTYPE
  71 #endif
  72
  73 /*
  74   we can't use krb5_mk_req because w2k wants the service to be in a particular format
  75 */
  76 static krb5_error_code krb5_mk_req2(krb5_context context,
  77                                     krb5_auth_context *auth_context,
  78                                     const krb5_flags ap_req_options,
  79                                     const char *principal,
  80                                     krb5_ccache ccache,
  81                                     krb5_data *outbuf)
  82 {
  83         krb5_error_code           retval;
  84         krb5_principal    server;
  85         krb5_creds              * credsp;
  86         krb5_creds                creds;
  87         krb5_data in_data;
  88
  89         retval = krb5_parse_name(context, principal, &server);
  90         if (retval) {
  91                 DEBUG(1,("Failed to parse principal %s\n", principal));
  92                 return retval;
  93         }
  94
  95         /* obtain ticket & session key */
  96         memset((char *)&creds, 0, sizeof(creds));
  97         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
  98                 DEBUG(1,("krb5_copy_principal failed (%s)\n",
  99                          error_message(retval)));
 100                 goto cleanup_princ;
 101         }
 102
 103         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 104                 DEBUG(1,("krb5_cc_get_principal failed (%s)\n",
 105                          error_message(retval)));
 106                 goto cleanup_creds;
 107         }
 108
 109         if ((retval = krb5_get_credentials(context, 0,
 110                                            ccache, &creds, &credsp))) {
 111                 DEBUG(1,("krb5_get_credentials failed for %s (%s)\n",
 112                          principal, error_message(retval)));
 113                 goto cleanup_creds;
 114         }
 115
 116         /* cope with the ticket being in the future due to clock skew */
 117         if ((unsigned)credsp->times.starttime > time(NULL)) {
 118                 time_t t = time(NULL);
 119                 int time_offset = (unsigned)credsp->times.starttime - t;
 120                 DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 121                 krb5_set_real_time(context, t + time_offset + 1, 0);
 122         }
 123
 124         in_data.length = 0;
 125         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 126                                       &in_data, credsp, outbuf);
 127         if (retval) {
 128                 DEBUG(1,("krb5_mk_req_extended failed (%s)\n",
 129                          error_message(retval)));
 130         }
 131
 132         krb5_free_creds(context, credsp);
 133
 134 cleanup_creds:
 135         krb5_free_cred_contents(context, &creds);
 136
 137 cleanup_princ:
 138         krb5_free_principal(context, server);
 139
 140         return retval;
 141 }
 142
 143 /*
 144   get a kerberos5 ticket for the given service
 145 */
 146 DATA_BLOB krb5_get_ticket(const char *principal, time_t time_offset)
 147 {
 148         krb5_error_code retval;
 149         krb5_data packet;
 150         krb5_ccache ccdef;
 151         krb5_context context;
 152         krb5_auth_context auth_context = NULL;
 153         DATA_BLOB ret;
 154         krb5_enctype enc_types[] = {
 155 #ifdef ENCTYPE_ARCFOUR_HMAC
 156                 ENCTYPE_ARCFOUR_HMAC,
 157 #endif
 158                                     ENCTYPE_DES_CBC_MD5,
 159                                     ENCTYPE_NULL};
 160
 161         retval = krb5_init_context(&context);
 162         if (retval) {
 163                 DEBUG(1,("krb5_init_context failed (%s)\n",
 164                          error_message(retval)));
 165                 goto failed;
 166         }
 167
 168         if (time_offset != 0) {
 169                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 170         }
 171
 172         if ((retval = krb5_cc_default(context, &ccdef))) {
 173                 DEBUG(1,("krb5_cc_default failed (%s)\n",
 174                          error_message(retval)));
 175                 goto failed;
 176         }
 177
 178         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 179                 DEBUG(1,("krb5_set_default_tgs_ktypes failed (%s)\n",
 180                          error_message(retval)));
 181                 goto failed;
 182         }
 183
 184         if ((retval = krb5_mk_req2(context,
 185                                    &auth_context,
 186                                    0,
 187                                    principal,
 188                                    ccdef, &packet))) {
 189                 goto failed;
 190         }
 191
 192         ret = data_blob(packet.data, packet.length);
 193 /* Hmm, heimdal dooesn't have this - what's the correct call? */
 194 /*      krb5_free_data_contents(context, &packet); */
 195         krb5_free_context(context);
 196         return ret;
 197
 198 failed:
 199         if ( context )
 200                 krb5_free_context(context);
 201
 202         return data_blob(NULL, 0);
 203 }
 204
 205
 206 #else /* HAVE_KRB5 */
 207  /* this saves a few linking headaches */
 208  DATA_BLOB krb5_get_ticket(const char *principal, time_t time_offset)
 209  {
 210          DEBUG(0,("NO KERBEROS SUPPORT\n"));
 211          return data_blob(NULL, 0);
 212  }
 213 #endif