source4/libcli/auth/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 2002-2003
   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 #include "system/network.h"
  24 #include "system/kerberos.h"
  25 #include "libcli/auth/kerberos.h"
  26 #include "system/time.h"
  27
  28 #ifdef HAVE_KRB5
  29
  30 #ifndef HAVE_KRB5_SET_REAL_TIME
  31 /*
  32  * This function is not in the Heimdal mainline.
  33  */
  34  krb5_error_code krb5_set_real_time(krb5_context context, int32_t seconds, int32_t microseconds)
  35 {
  36         krb5_error_code ret;
  37         int32_t sec, usec;
  38
  39         ret = krb5_us_timeofday(context, &sec, &usec);
  40         if (ret)
  41                 return ret;
  42
  43         context->kdc_sec_offset = seconds - sec;
  44         context->kdc_usec_offset = microseconds - usec;
  45
  46         return 0;
  47 }
  48 #endif
  49
  50 #if defined(HAVE_KRB5_SET_DEFAULT_IN_TKT_ETYPES) && !defined(HAVE_KRB5_SET_DEFAULT_TGS_KTYPES)
  51  krb5_error_code krb5_set_default_tgs_ktypes(krb5_context ctx, const krb5_enctype *enc)
  52 {
  53         return krb5_set_default_in_tkt_etypes(ctx, enc);
  54 }
  55 #endif
  56
  57 #if defined(HAVE_ADDR_TYPE_IN_KRB5_ADDRESS)
  58 /* HEIMDAL */
  59  void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
  60 {
  61         pkaddr->addr_type = KRB5_ADDRESS_INET;
  62         pkaddr->address.length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
  63         pkaddr->address.data = (char *)&(((struct sockaddr_in *)paddr)->sin_addr);
  64 }
  65 #elif defined(HAVE_ADDRTYPE_IN_KRB5_ADDRESS)
  66 /* MIT */
  67  void setup_kaddr( krb5_address *pkaddr, struct sockaddr *paddr)
  68 {
  69         pkaddr->addrtype = ADDRTYPE_INET;
  70         pkaddr->length = sizeof(((struct sockaddr_in *)paddr)->sin_addr);
  71         pkaddr->contents = (krb5_octet *)&(((struct sockaddr_in *)paddr)->sin_addr);
  72 }
  73 #else
  74  __ERROR__XX__UNKNOWN_ADDRTYPE
  75 #endif
  76
  77 #if defined(HAVE_KRB5_PRINCIPAL2SALT) && defined(HAVE_KRB5_USE_ENCTYPE) && defined(HAVE_KRB5_STRING_TO_KEY)
  78  int create_kerberos_key_from_string(krb5_context context,
  79                                         krb5_principal host_princ,
  80                                         krb5_data *password,
  81                                         krb5_keyblock *key,
  82                                         krb5_enctype enctype)
  83 {
  84         int ret;
  85         krb5_data salt;
  86         krb5_encrypt_block eblock;
  87
  88         ret = krb5_principal2salt(context, host_princ, &salt);
  89         if (ret) {
  90                 DEBUG(1,("krb5_principal2salt failed (%s)\n", error_message(ret)));
  91                 return ret;
  92         }
  93         krb5_use_enctype(context, &eblock, enctype);
  94         ret = krb5_string_to_key(context, &eblock, key, password, &salt);
  95         SAFE_FREE(salt.data);
  96         return ret;
  97 }
  98 #elif defined(HAVE_KRB5_GET_PW_SALT) && defined(HAVE_KRB5_STRING_TO_KEY_SALT)
  99  int create_kerberos_key_from_string(krb5_context context,
 100                                         krb5_principal host_princ,
 101                                         krb5_data *password,
 102                                         krb5_keyblock *key,
 103                                         krb5_enctype enctype)
 104 {
 105         int ret;
 106         krb5_salt salt;
 107
 108         ret = krb5_get_pw_salt(context, host_princ, &salt);
 109         if (ret) {
 110                 DEBUG(1,("krb5_get_pw_salt failed (%s)\n", error_message(ret)));
 111                 return ret;
 112         }
 113         return krb5_string_to_key_salt(context, enctype, password->data,
 114                 salt, key);
 115 }
 116 #else
 117  __ERROR_XX_UNKNOWN_CREATE_KEY_FUNCTIONS
 118 #endif
 119
 120 #if defined(HAVE_KRB5_GET_PERMITTED_ENCTYPES)
 121  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 122                                             krb5_enctype **enctypes)
 123 {
 124         return krb5_get_permitted_enctypes(context, enctypes);
 125 }
 126 #elif defined(HAVE_KRB5_GET_DEFAULT_IN_TKT_ETYPES)
 127  krb5_error_code get_kerberos_allowed_etypes(krb5_context context,
 128                                             krb5_enctype **enctypes)
 129 {
 130         return krb5_get_default_in_tkt_etypes(context, enctypes);
 131 }
 132 #else
 133 #error UNKNOWN_GET_ENCTYPES_FUNCTIONS
 134 #endif
 135
 136  void free_kerberos_etypes(krb5_context context,
 137                            krb5_enctype *enctypes)
 138 {
 139 #if defined(HAVE_KRB5_FREE_KTYPES)
 140         krb5_free_ktypes(context, enctypes);
 141         return;
 142 #else
 143         SAFE_FREE(enctypes);
 144         return;
 145 #endif
 146 }
 147
 148 #if defined(HAVE_KRB5_AUTH_CON_SETKEY) && !defined(HAVE_KRB5_AUTH_CON_SETUSERUSERKEY)
 149  krb5_error_code krb5_auth_con_setuseruserkey(krb5_context context,
 150                                         krb5_auth_context auth_context,
 151                                         krb5_keyblock *keyblock)
 152 {
 153         return krb5_auth_con_setkey(context, auth_context, keyblock);
 154 }
 155 #endif
 156
 157  DATA_BLOB get_auth_data_from_tkt(TALLOC_CTX *mem_ctx,
 158                             krb5_ticket *tkt)
 159 {
 160         DATA_BLOB auth_data = data_blob(NULL, 0);
 161 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 162         if (tkt && tkt->enc_part2
 163             && tkt->enc_part2->authorization_data
 164             && tkt->enc_part2->authorization_data[0]
 165             && tkt->enc_part2->authorization_data[0]->length)
 166                 auth_data = data_blob(tkt->enc_part2->authorization_data[0]->contents,
 167                         tkt->enc_part2->authorization_data[0]->length);
 168 #else
 169         if (tkt && tkt->ticket.authorization_data && tkt->ticket.authorization_data->len)
 170                 auth_data = data_blob(tkt->ticket.authorization_data->val->ad_data.data,
 171                         tkt->ticket.authorization_data->val->ad_data.length);
 172 #endif
 173         return auth_data;
 174 }
 175
 176  krb5_const_principal get_principal_from_tkt(krb5_ticket *tkt)
 177 {
 178 #if defined(HAVE_KRB5_TKT_ENC_PART2)
 179         return tkt->enc_part2->client;
 180 #else
 181         return tkt->client;
 182 #endif
 183 }
 184
 185 #if !defined(HAVE_KRB5_LOCATE_KDC)
 186  krb5_error_code krb5_locate_kdc(krb5_context ctx, const krb5_data *realm, struct sockaddr **addr_pp, int *naddrs, int get_masters)
 187 {
 188         krb5_krbhst_handle hnd;
 189         krb5_krbhst_info *hinfo;
 190         krb5_error_code rc;
 191         int num_kdcs, i;
 192         struct sockaddr *sa;
 193         struct addrinfo **ai;
 194
 195         *addr_pp = NULL;
 196         *naddrs = 0;
 197
 198         rc = krb5_krbhst_init(ctx, realm->data, KRB5_KRBHST_KDC, &hnd);
 199         if (rc) {
 200                 DEBUG(0, ("krb5_locate_kdc: krb5_krbhst_init failed (%s)\n", error_message(rc)));
 201                 return rc;
 202         }
 203
 204         for ( num_kdcs = 0; (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); num_kdcs++)
 205                 ;
 206
 207         krb5_krbhst_reset(ctx, hnd);
 208
 209         if (!num_kdcs) {
 210                 DEBUG(0, ("krb5_locate_kdc: zero kdcs found !\n"));
 211                 krb5_krbhst_free(ctx, hnd);
 212                 return -1;
 213         }
 214
 215         sa = malloc( sizeof(struct sockaddr) * num_kdcs );
 216         if (!sa) {
 217                 DEBUG(0, ("krb5_locate_kdc: malloc failed\n"));
 218                 krb5_krbhst_free(ctx, hnd);
 219                 naddrs = 0;
 220                 return -1;
 221         }
 222
 223         *addr_pp = malloc(sizeof(struct sockaddr) * num_kdcs);
 224         memset(*addr_pp, '\0', sizeof(struct sockaddr) * num_kdcs );
 225
 226         for (i = 0; i < num_kdcs && (rc = krb5_krbhst_next(ctx, hnd, &hinfo) == 0); i++) {
 227
 228 #if defined(HAVE_KRB5_KRBHST_GET_ADDRINFO)
 229                 rc = krb5_krbhst_get_addrinfo(ctx, hinfo, ai);
 230                 if (rc) {
 231                         DEBUG(0,("krb5_krbhst_get_addrinfo failed: %s\n", error_message(rc)));
 232                         return rc;
 233                 }
 234 #endif
 235                 if (hinfo->ai && hinfo->ai->ai_family == AF_INET)
 236                         memcpy(&sa[i], hinfo->ai->ai_addr, sizeof(struct sockaddr));
 237         }
 238
 239         krb5_krbhst_free(ctx, hnd);
 240
 241         *naddrs = num_kdcs;
 242         *addr_pp = sa;
 243         return 0;
 244 }
 245 #endif
 246
 247 #if !defined(HAVE_KRB5_FREE_UNPARSED_NAME)
 248  void krb5_free_unparsed_name(krb5_context context, char *val)
 249 {
 250         SAFE_FREE(val);
 251 }
 252 #endif
 253
 254 static BOOL ads_cleanup_expired_creds(krb5_context context,
 255                                       krb5_ccache  ccache,
 256                                       krb5_creds  *credsp)
 257 {
 258         krb5_error_code retval;
 259         TALLOC_CTX *mem_ctx = talloc_init("ticket expied time");
 260         if (!mem_ctx) {
 261                 return False;
 262         }
 263
 264         DEBUG(3, ("Ticket in ccache[%s] expiration %s\n",
 265                   krb5_cc_default_name(context),
 266                   http_timestring(mem_ctx, credsp->times.endtime)));
 267
 268         talloc_destroy(mem_ctx);
 269
 270         /* we will probably need new tickets if the current ones
 271            will expire within 10 seconds.
 272         */
 273         if (credsp->times.endtime >= (time(NULL) + 10))
 274                 return False;
 275
 276         /* heimdal won't remove creds from a file ccache, and
 277            perhaps we shouldn't anyway, since internally we
 278            use memory ccaches, and a FILE one probably means that
 279            we're using creds obtained outside of our exectuable
 280         */
 281         if (StrCaseCmp(krb5_cc_get_type(context, ccache), "FILE") == 0) {
 282                 DEBUG(5, ("We do not remove creds from a FILE ccache\n"));
 283                 return False;
 284         }
 285
 286         retval = krb5_cc_remove_cred(context, ccache, 0, credsp);
 287         if (retval) {
 288                 DEBUG(1, ("krb5_cc_remove_cred failed, err %s\n",
 289                           error_message(retval)));
 290                 /* If we have an error in this, we want to display it,
 291                    but continue as though we deleted it */
 292         }
 293         return True;
 294 }
 295
 296 /*
 297   we can't use krb5_mk_req because w2k wants the service to be in a particular format
 298 */
 299  krb5_error_code ads_krb5_mk_req(krb5_context context,
 300                                 krb5_auth_context *auth_context,
 301                                 const krb5_flags ap_req_options,
 302                                 const char *principal,
 303                                 krb5_ccache ccache,
 304                                 krb5_data *outbuf)
 305 {
 306         krb5_error_code           retval;
 307         krb5_principal    server;
 308         krb5_creds              * credsp;
 309         krb5_creds                creds;
 310         krb5_data in_data;
 311         BOOL creds_ready = False;
 312
 313         TALLOC_CTX *mem_ctx = NULL;
 314
 315         retval = krb5_parse_name(context, principal, &server);
 316         if (retval) {
 317                 DEBUG(1,("Failed to parse principal %s\n", principal));
 318                 return retval;
 319         }
 320
 321         /* obtain ticket & session key */
 322         ZERO_STRUCT(creds);
 323         if ((retval = krb5_copy_principal(context, server, &creds.server))) {
 324                 DEBUG(1,("krb5_copy_principal failed (%s)\n",
 325                          error_message(retval)));
 326                 goto cleanup_princ;
 327         }
 328
 329         if ((retval = krb5_cc_get_principal(context, ccache, &creds.client))) {
 330                 DEBUG(10,("krb5_cc_get_principal failed (%s)\n",
 331                          error_message(retval)));
 332                 goto cleanup_creds;
 333         }
 334
 335         while(!creds_ready) {
 336                 if ((retval = krb5_get_credentials(context, 0, ccache,
 337                                                    &creds, &credsp))) {
 338                         DEBUG(1,("krb5_get_credentials failed for %s (%s)\n",
 339                                  principal, error_message(retval)));
 340                         goto cleanup_creds;
 341                 }
 342
 343                 /* cope with ticket being in the future due to clock skew */
 344                 if ((unsigned)credsp->times.starttime > time(NULL)) {
 345                         time_t t = time(NULL);
 346                         int time_offset =(unsigned)credsp->times.starttime-t;
 347                         DEBUG(4,("Advancing clock by %d seconds to cope with clock skew\n", time_offset));
 348                         krb5_set_real_time(context, t + time_offset + 1, 0);
 349                 }
 350
 351                 if (!ads_cleanup_expired_creds(context, ccache, credsp))
 352                         creds_ready = True;
 353         }
 354
 355         mem_ctx = talloc_init("ticket expied time");
 356         if (!mem_ctx) {
 357                 retval = ENOMEM;
 358                 goto cleanup_creds;
 359         }
 360         DEBUG(10,("Ticket (%s) in ccache (%s) is valid until: (%s - %d)\n",
 361                   principal, krb5_cc_default_name(context),
 362                   http_timestring(mem_ctx, (unsigned)credsp->times.endtime),
 363                   (unsigned)credsp->times.endtime));
 364
 365         in_data.length = 0;
 366         retval = krb5_mk_req_extended(context, auth_context, ap_req_options,
 367                                       &in_data, credsp, outbuf);
 368         if (retval) {
 369                 DEBUG(1,("krb5_mk_req_extended failed (%s)\n",
 370                          error_message(retval)));
 371         }
 372
 373         krb5_free_creds(context, credsp);
 374
 375 cleanup_creds:
 376         krb5_free_cred_contents(context, &creds);
 377
 378 cleanup_princ:
 379         krb5_free_principal(context, server);
 380
 381         if (mem_ctx) {
 382                 talloc_destroy(mem_ctx);
 383         }
 384         return retval;
 385 }
 386
 387
 388 #if defined(HAVE_KRB5_PRINCIPAL_GET_COMP_STRING) && !defined(HAVE_KRB5_PRINC_COMPONENT)
 389  const krb5_data *krb5_princ_component(krb5_context context, krb5_principal principal, int i )
 390 {
 391         static krb5_data kdata;
 392
 393         kdata.data = discard_const(krb5_principal_get_comp_string(context, principal, i));
 394         kdata.length = strlen(kdata.data);
 395         return &kdata;
 396 }
 397 #endif
 398
 399  krb5_error_code smb_krb5_kt_free_entry(krb5_context context, krb5_keytab_entry *kt_entry)
 400 {
 401 #if defined(HAVE_KRB5_KT_FREE_ENTRY)
 402         return krb5_kt_free_entry(context, kt_entry);
 403 #elif defined(HAVE_KRB5_FREE_KEYTAB_ENTRY_CONTENTS)
 404         return krb5_free_keytab_entry_contents(context, kt_entry);
 405 #else
 406 #error UNKNOWN_KT_FREE_FUNCTION
 407 #endif
 408 }
 409
 410 #endif