source3/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 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY)
  74  int create_kerberos_key_from_string(krb5_context context,
  75                                         krb5_principal host_princ,
  76                                         krb5_data *password,
  77                                         krb5_keyblock *key)
  78 {
  79         int ret;
  80         krb5_data salt;
  81         krb5_encrypt_block eblock;
  82
  83         ret = krb5_principal2salt(context, host_princ, &salt);
  84         if (ret) {
  85                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
  86                 return ret;
  87         }
  88         krb5_use_enctype(context, &eblock, ENCTYPE_DES_CBC_MD5);
  89         return krb5_string_to_key(context, &eblock, key, password, &salt);
  90 }
  91 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
  92  int create_kerberos_key_from_string(krb5_context context,
  93                                         krb5_principal host_princ,
  94                                         krb5_data *password,
  95                                         krb5_keyblock *key)
  96 {
  97         int ret;
  98         krb5_salt salt;
  99
 100         ret = krb5_get_pw_salt(context, host_princ, &salt);
 101         if (ret) {
 102                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 103                 return ret;
 104         }
 105         return krb5_string_to_key_salt(context, ENCTYPE_DES_CBC_MD5, password->data,
 106                 salt, key);
 107 }
 108 #else
 109  __ERROR_XX_UNKNOWN_CREATE_KEY_FUNCTIONS
 110 #endif
 111
 112 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 113  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 114                                         krb5_auth_context auth_context,
 115                                         krb5_keyblock *keyblock)
 116 {
 117         return krb5_auth_con_setkey(context, auth_context, keyblock);
 118 }
 119 #endif
 120
 121  void get_auth_data_from_tkt(DATA_BLOB *auth_data, krb5_ticket *tkt)
 122 {
 123 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 124         if (tkt->enc_part2)
 125                 *auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents,
 126                         tkt->enc_part2->authorization_data[0]->length);
 127 #else
 128         if (tkt->ticket.authorization_data && tkt->ticket.authorization_data->len)
 129                 *auth_data = data_blob(tkt->ticket.authorization_data->val->ad_data.data,
 130                         tkt->ticket.authorization_data->val->ad_data.length);
 131 #endif
 132 }
 133
 134  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 135 {
 136 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 137         return tkt->enc_part2->client;
 138 #else
 139         return tkt->client;
 140 #endif
 141 }
 142
 143 #if !defined(HAVE_KRB5_LOCATE_KDC)
 144  krb5_error_code krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 145 {
 146         krb5_krbhst_handle hnd;
 147         krb5_krbhst_info *hinfo;
 148         krb5_error_code rc;
 149         int num_kdcs, i;
 150         struct sockaddr *sa;
 151
 152         *addr_pp = NULL;
 153         *naddrs = 0;
 154
 155         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 156         if (rc) {
 157                 DEBUG(0, ("krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 158                 return rc;
 159         }
 160
 161         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 162                 ;
 163
 164         krb5_krbhst_reset(ctx, hnd);
 165
 166         if (!num_kdcs) {
 167                 DEBUG(0, ("krb5_locate_kdc: zero kdcs found !\n"));
 168                 krb5_krbhst_free(ctx, hnd);
 169                 return -1;
 170         }
 171
 172         sa = malloc( sizeof(struct sockaddr) * num_kdcs );
 173         if (!sa) {
 174                 DEBUG(0, ("krb5_locate_kdc: malloc failed\n"));
 175                 krb5_krbhst_free(ctx, hnd);
 176                 naddrs = 0;
 177                 return -1;
 178         }
 179
 180         memset(*addr_pp, '\0', sizeof(struct sockaddr) * num_kdcs );
 181
 182         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 183                 if (hinfo->ai->ai_family == AF_INET)
 184                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 185         }
 186
 187         krb5_krbhst_free(ctx, hnd);
 188
 189         *naddrs = num_kdcs;
 190         *addr_pp = sa;
 191         return 0;
 192 }
 193 #endif
 194
 195 /*
 196   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 197 */
 198 static krb5_error_code krb5_mk_req2(krb5_context context,
 199                                     krb5_auth_context *auth_context,
 200                                     const krb5_flags ap_req_options,
 201                                     const char *principal,
 202                                     krb5_ccache ccache,
 203                                     krb5_data *outbuf)
 204 {
 205         krb5_error_code           retval;
 206         krb5_principal    server;
 207         krb5_creds              * credsp;
 208         krb5_creds                creds;
 209         krb5_data in_data;
 210
 211         retval = krb5_parse_name(context, principal, &server);
 212         if (retval) {
 213                 DEBUG(1,("Failed to parse principal %s\n", principal));
 214                 return retval;
 215         }
 216
 217         /* obtain ticket & session key */
 218         memset((char *)&creds, 0, sizeof(creds));
 219         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 220                 DEBUG(1,("krb5_copy_principal failed (%s)\n",
 221                          error_message(retval)));
 222                 goto cleanup_princ;
 223         }
 224
 225         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 226                 DEBUG(1,("krb5_cc_get_principal failed (%s)\n",
 227                          error_message(retval)));
 228                 goto cleanup_creds;
 229         }
 230
 231         if ((retval = krb5_get_credentials(context, 0,
 232                                            ccache, &creds, &credsp))) {
 233                 DEBUG(1,("krb5_get_credentials failed for %s (%s)\n",
 234                          principal, error_message(retval)));
 235                 goto cleanup_creds;
 236         }
 237
 238         /* cope with the ticket being in the future due to clock skew */
 239         if ((unsigned)credsp->times.starttime > time(NULL)) {
 240                 time_t t = time(NULL);
 241                 int time_offset = (unsigned)credsp->times.starttime - t;
 242                 DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 243                 krb5_set_real_time(context, t + time_offset + 1, 0);
 244         }
 245
 246         in_data.length = 0;
 247         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 248                                       &in_data, credsp, outbuf);
 249         if (retval) {
 250                 DEBUG(1,("krb5_mk_req_extended failed (%s)\n",
 251                          error_message(retval)));
 252         }
 253
 254         krb5_free_creds(context, credsp);
 255
 256 cleanup_creds:
 257         krb5_free_cred_contents(context, &creds);
 258
 259 cleanup_princ:
 260         krb5_free_principal(context, server);
 261
 262         return retval;
 263 }
 264
 265 /*
 266   get a kerberos5 ticket for the given service
 267 */
 268 DATA_BLOB krb5_get_ticket(const char *principal, time_t time_offset)
 269 {
 270         krb5_error_code retval;
 271         krb5_data packet;
 272         krb5_ccache ccdef;
 273         krb5_context context;
 274         krb5_auth_context auth_context = NULL;
 275         DATA_BLOB ret;
 276         krb5_enctype enc_types[] = {
 277 #ifdef ENCTYPE_ARCFOUR_HMAC
 278                 ENCTYPE_ARCFOUR_HMAC,
 279 #endif
 280                                     ENCTYPE_DES_CBC_MD5,
 281                                     ENCTYPE_NULL};
 282
 283         retval = krb5_init_context(&context);
 284         if (retval) {
 285                 DEBUG(1,("krb5_init_context failed (%s)\n",
 286                          error_message(retval)));
 287                 goto failed;
 288         }
 289
 290         if (time_offset != 0) {
 291                 krb5_set_real_time(context, time(NULL) + time_offset, 0);
 292         }
 293
 294         if ((retval = krb5_cc_default(context, &ccdef))) {
 295                 DEBUG(1,("krb5_cc_default failed (%s)\n",
 296                          error_message(retval)));
 297                 goto failed;
 298         }
 299
 300         if ((retval = krb5_set_default_tgs_ktypes(context, enc_types))) {
 301                 DEBUG(1,("krb5_set_default_tgs_ktypes failed (%s)\n",
 302                          error_message(retval)));
 303                 goto failed;
 304         }
 305
 306         if ((retval = krb5_mk_req2(context,
 307                                    &auth_context,
 308                                    0,
 309                                    principal,
 310                                    ccdef, &packet))) {
 311                 goto failed;
 312         }
 313
 314         ret = data_blob(packet.data, packet.length);
 315 /* Hmm, heimdal dooesn't have this - what's the correct call? */
 316 /*      krb5_free_data_contents(context, &packet); */
 317         krb5_free_context(context);
 318         return ret;
 319
 320 failed:
 321         if ( context )
 322                 krb5_free_context(context);
 323
 324         return data_blob(NULL, 0);
 325 }
 326
 327
 328 #else /* HAVE_KRB5 */
 329  /* this saves a few linking headaches */
 330  DATA_BLOB krb5_get_ticket(const char *principal, time_t time_offset)
 331  {
 332          DEBUG(0,("NO KERBEROS SUPPORT\n"));
 333          return data_blob(NULL, 0);
 334  }
 335 #endif