source3/libnet/libnet_dssync_keytab.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Guenther Deschner <gd@samba.org> 2008
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "includes.h"
  21 #include "libnet/libnet.h"
  22 #include "librpc/gen_ndr/ndr_drsblobs.h"
  23
  24 #if defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC)
  25
  26 static NTSTATUS add_to_keytab_entries(TALLOC_CTX *mem_ctx,
  27                                       struct libnet_keytab_context *ctx,
  28                                       uint32_t kvno,
  29                                       const char *name,
  30                                       const char *prefix,
  31                                       const krb5_enctype enctype,
  32                                       DATA_BLOB blob)
  33 {
  34         struct libnet_keytab_entry entry;
  35
  36         entry.kvno = kvno;
  37         entry.name = talloc_strdup(mem_ctx, name);
  38         entry.principal = talloc_asprintf(mem_ctx, "%s%s%s@%s",
  39                                           prefix ? prefix : "",
  40                                           prefix ? "/" : "",
  41                                           name, ctx->dns_domain_name);
  42         entry.enctype = enctype;
  43         entry.password = blob;
  44         NT_STATUS_HAVE_NO_MEMORY(entry.name);
  45         NT_STATUS_HAVE_NO_MEMORY(entry.principal);
  46         NT_STATUS_HAVE_NO_MEMORY(entry.password.data);
  47
  48         ADD_TO_ARRAY(mem_ctx, struct libnet_keytab_entry, entry,
  49                      &ctx->entries, &ctx->count);
  50         NT_STATUS_HAVE_NO_MEMORY(ctx->entries);
  51
  52         return NT_STATUS_OK;
  53 }
  54
  55 static NTSTATUS keytab_startup(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
  56                                struct replUpToDateVectorBlob **pold_utdv)
  57 {
  58         krb5_error_code ret = 0;
  59         struct libnet_keytab_context *keytab_ctx;
  60         struct libnet_keytab_entry *entry;
  61         struct replUpToDateVectorBlob *old_utdv = NULL;
  62         char *principal;
  63
  64         ret = libnet_keytab_init(mem_ctx, ctx->output_filename, &keytab_ctx);
  65         if (ret) {
  66                 return krb5_to_nt_status(ret);
  67         }
  68
  69         keytab_ctx->dns_domain_name = ctx->dns_domain_name;
  70         ctx->private_data = keytab_ctx;
  71
  72         principal = talloc_asprintf(mem_ctx, "UTDV/%s@%s",
  73                                     ctx->nc_dn, ctx->dns_domain_name);
  74         NT_STATUS_HAVE_NO_MEMORY(principal);
  75
  76         entry = libnet_keytab_search(keytab_ctx, principal, 0, ENCTYPE_ARCFOUR_HMAC,
  77                                      mem_ctx);
  78         if (entry) {
  79                 enum ndr_err_code ndr_err;
  80                 old_utdv = talloc(mem_ctx, struct replUpToDateVectorBlob);
  81
  82                 ndr_err = ndr_pull_struct_blob(&entry->password, old_utdv,
  83                                 old_utdv,
  84                                 (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
  85                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  86                         NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
  87                         ctx->error_message = talloc_asprintf(mem_ctx,
  88                                         "Failed to pull UpToDateVector: %s",
  89                                         nt_errstr(status));
  90                         return status;
  91                 }
  92
  93                 if (DEBUGLEVEL >= 10) {
  94                         NDR_PRINT_DEBUG(replUpToDateVectorBlob, old_utdv);
  95                 }
  96         }
  97
  98         if (pold_utdv) {
  99                 *pold_utdv = old_utdv;
 100         }
 101
 102         return NT_STATUS_OK;
 103 }
 104
 105 static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 106                               struct replUpToDateVectorBlob *new_utdv)
 107 {
 108         NTSTATUS status = NT_STATUS_OK;
 109         krb5_error_code ret = 0;
 110         struct libnet_keytab_context *keytab_ctx =
 111                 (struct libnet_keytab_context *)ctx->private_data;
 112
 113         if (new_utdv) {
 114                 enum ndr_err_code ndr_err;
 115                 DATA_BLOB blob;
 116
 117                 if (DEBUGLEVEL >= 10) {
 118                         NDR_PRINT_DEBUG(replUpToDateVectorBlob, new_utdv);
 119                 }
 120
 121                 ndr_err = ndr_push_struct_blob(&blob, mem_ctx, new_utdv,
 122                                 (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
 123                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 124                         status = ndr_map_error2ntstatus(ndr_err);
 125                         ctx->error_message = talloc_asprintf(mem_ctx,
 126                                         "Failed to push UpToDateVector: %s",
 127                                         nt_errstr(status));
 128                         goto done;
 129                 }
 130
 131                 status = add_to_keytab_entries(mem_ctx, keytab_ctx, 0,
 132                                                ctx->nc_dn, "UTDV",
 133                                                ENCTYPE_ARCFOUR_HMAC,
 134                                                blob);
 135                 if (!NT_STATUS_IS_OK(status)) {
 136                         goto done;
 137                 }
 138         }
 139
 140         ret = libnet_keytab_add(keytab_ctx);
 141         if (ret) {
 142                 status = krb5_to_nt_status(ret);
 143                 ctx->error_message = talloc_asprintf(mem_ctx,
 144                         "Failed to add entries to keytab %s: %s",
 145                         keytab_ctx->keytab_name, error_message(ret));
 146                 goto done;
 147         }
 148
 149         ctx->result_message = talloc_asprintf(mem_ctx,
 150                 "Vampired %d accounts to keytab %s",
 151                 keytab_ctx->count,
 152                 keytab_ctx->keytab_name);
 153
 154 done:
 155         TALLOC_FREE(keytab_ctx);
 156         return status;
 157 }
 158
 159 /****************************************************************
 160 ****************************************************************/
 161
 162 static NTSTATUS parse_object(TALLOC_CTX *mem_ctx,
 163                              struct libnet_keytab_context *ctx,
 164                              struct drsuapi_DsReplicaObjectListItemEx *cur)
 165 {
 166         NTSTATUS status = NT_STATUS_OK;
 167         uchar nt_passwd[16];
 168         DATA_BLOB *blob;
 169         int i = 0;
 170         struct drsuapi_DsReplicaAttribute *attr;
 171         bool got_pwd = false;
 172
 173         char *upn = NULL;
 174         char **spn = NULL;
 175         uint32_t num_spns = 0;
 176         char *name = NULL;
 177         uint32_t kvno = 0;
 178         uint32_t uacc = 0;
 179         uint32_t sam_type = 0;
 180
 181         uint32_t pwd_history_len = 0;
 182         uint8_t *pwd_history = NULL;
 183
 184         ZERO_STRUCT(nt_passwd);
 185
 186         for (i=0; i < cur->object.attribute_ctr.num_attributes; i++) {
 187
 188                 attr = &cur->object.attribute_ctr.attributes[i];
 189
 190                 if (attr->attid == DRSUAPI_ATTRIBUTE_servicePrincipalName) {
 191                         uint32_t count;
 192                         num_spns = attr->value_ctr.num_values;
 193                         spn = TALLOC_ARRAY(mem_ctx, char *, num_spns);
 194                         for (count = 0; count < num_spns; count++) {
 195                                 blob = attr->value_ctr.values[count].blob;
 196                                 pull_string_talloc(spn, NULL, 0,
 197                                                    &spn[count],
 198                                                    blob->data, blob->length,
 199                                                    STR_UNICODE);
 200                         }
 201                 }
 202
 203                 if (attr->value_ctr.num_values != 1) {
 204                         continue;
 205                 }
 206
 207                 if (!attr->value_ctr.values[0].blob) {
 208                         continue;
 209                 }
 210
 211                 blob = attr->value_ctr.values[0].blob;
 212
 213                 switch (attr->attid) {
 214                         case DRSUAPI_ATTRIBUTE_unicodePwd:
 215
 216                                 if (blob->length != 16) {
 217                                         break;
 218                                 }
 219
 220                                 memcpy(&nt_passwd, blob->data, 16);
 221                                 got_pwd = true;
 222
 223                                 /* pick the kvno from the meta_data version,
 224                                  * thanks, metze, for explaining this */
 225
 226                                 if (!cur->meta_data_ctr) {
 227                                         break;
 228                                 }
 229                                 if (cur->meta_data_ctr->count !=
 230                                     cur->object.attribute_ctr.num_attributes) {
 231                                         break;
 232                                 }
 233                                 kvno = cur->meta_data_ctr->meta_data[i].version;
 234                                 break;
 235                         case DRSUAPI_ATTRIBUTE_ntPwdHistory:
 236                                 pwd_history_len = blob->length / 16;
 237                                 pwd_history = blob->data;
 238                                 break;
 239                         case DRSUAPI_ATTRIBUTE_userPrincipalName:
 240                                 pull_string_talloc(mem_ctx, NULL, 0, &upn,
 241                                                    blob->data, blob->length,
 242                                                    STR_UNICODE);
 243                                 break;
 244                         case DRSUAPI_ATTRIBUTE_sAMAccountName:
 245                                 pull_string_talloc(mem_ctx, NULL, 0, &name,
 246                                                    blob->data, blob->length,
 247                                                    STR_UNICODE);
 248                                 break;
 249                         case DRSUAPI_ATTRIBUTE_sAMAccountType:
 250                                 sam_type = IVAL(blob->data, 0);
 251                                 break;
 252                         case DRSUAPI_ATTRIBUTE_userAccountControl:
 253                                 uacc = IVAL(blob->data, 0);
 254                                 break;
 255                         default:
 256                                 break;
 257                 }
 258         }
 259
 260         if (!name) {
 261                 DEBUG(10, ("no name (sAMAccountName) found - skipping.\n"));
 262                 return NT_STATUS_OK;
 263         }
 264
 265         if (!got_pwd) {
 266                 DEBUG(10, ("no password (unicodePwd) found - skipping.\n"));
 267                 return NT_STATUS_OK;
 268         }
 269
 270         DEBUG(1,("#%02d: %s:%d, ", ctx->count, name, kvno));
 271         DEBUGADD(1,("sAMAccountType: 0x%08x, userAccountControl: 0x%08x",
 272                 sam_type, uacc));
 273         if (upn) {
 274                 DEBUGADD(1,(", upn: %s", upn));
 275         }
 276         if (num_spns > 0) {
 277                 DEBUGADD(1, (", spns: ["));
 278                 for (i = 0; i < num_spns; i++) {
 279                         DEBUGADD(1, ("%s%s", spn[i],
 280                                      (i+1 == num_spns)?"]":", "));
 281                 }
 282         }
 283         DEBUGADD(1,("\n"));
 284
 285         status = add_to_keytab_entries(mem_ctx, ctx, kvno, name, NULL,
 286                                        ENCTYPE_ARCFOUR_HMAC,
 287                                        data_blob_talloc(mem_ctx, nt_passwd, 16));
 288
 289         if (!NT_STATUS_IS_OK(status)) {
 290                 return status;
 291         }
 292
 293         if ((kvno < 0) && (kvno < pwd_history_len)) {
 294                 return status;
 295         }
 296
 297         /* add password history */
 298
 299         /* skip first entry */
 300         if (got_pwd) {
 301                 kvno--;
 302                 i = 1;
 303         } else {
 304                 i = 0;
 305         }
 306
 307         for (; i<pwd_history_len; i++) {
 308                 status = add_to_keytab_entries(mem_ctx, ctx, kvno--, name, NULL,
 309                                 ENCTYPE_ARCFOUR_HMAC,
 310                                 data_blob_talloc(mem_ctx, &pwd_history[i*16], 16));
 311                 if (!NT_STATUS_IS_OK(status)) {
 312                         break;
 313                 }
 314         }
 315
 316         return status;
 317 }
 318
 319 /****************************************************************
 320 ****************************************************************/
 321
 322 static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
 323                                        TALLOC_CTX *mem_ctx,
 324                                        struct drsuapi_DsReplicaObjectListItemEx *cur,
 325                                        struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
 326 {
 327         NTSTATUS status = NT_STATUS_OK;
 328         struct libnet_keytab_context *keytab_ctx =
 329                 (struct libnet_keytab_context *)ctx->private_data;
 330
 331         for (; cur; cur = cur->next_object) {
 332                 status = parse_object(mem_ctx, keytab_ctx, cur);
 333                 if (!NT_STATUS_IS_OK(status)) {
 334                         goto out;
 335                 }
 336         }
 337
 338  out:
 339         return status;
 340 }
 341
 342 #else
 343
 344 static NTSTATUS keytab_startup(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 345                                struct replUpToDateVectorBlob **pold_utdv)
 346 {
 347         return NT_STATUS_NOT_SUPPORTED;
 348 }
 349
 350 static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 351                               struct replUpToDateVectorBlob *new_utdv)
 352 {
 353         return NT_STATUS_NOT_SUPPORTED;
 354 }
 355
 356 static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
 357                                        TALLOC_CTX *mem_ctx,
 358                                        struct drsuapi_DsReplicaObjectListItemEx *cur,
 359                                        struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
 360 {
 361         return NT_STATUS_NOT_SUPPORTED;
 362 }
 363 #endif /* defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC) */
 364
 365 const struct dssync_ops libnet_dssync_keytab_ops = {
 366         .startup                = keytab_startup,
 367         .process_objects        = keytab_process_objects,
 368         .finish                 = keytab_finish,
 369 };