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 *name = NULL;
 175         uint32_t kvno = 0;
 176         uint32_t uacc = 0;
 177         uint32_t sam_type = 0;
 178
 179         uint32_t pwd_history_len = 0;
 180         uint8_t *pwd_history = NULL;
 181
 182         ZERO_STRUCT(nt_passwd);
 183
 184         for (i=0; i < cur->object.attribute_ctr.num_attributes; i++) {
 185
 186                 attr = &cur->object.attribute_ctr.attributes[i];
 187
 188                 if (attr->value_ctr.num_values != 1) {
 189                         continue;
 190                 }
 191
 192                 if (!attr->value_ctr.values[0].blob) {
 193                         continue;
 194                 }
 195
 196                 blob = attr->value_ctr.values[0].blob;
 197
 198                 switch (attr->attid) {
 199                         case DRSUAPI_ATTRIBUTE_unicodePwd:
 200
 201                                 if (blob->length != 16) {
 202                                         break;
 203                                 }
 204
 205                                 memcpy(&nt_passwd, blob->data, 16);
 206                                 got_pwd = true;
 207
 208                                 /* pick the kvno from the meta_data version,
 209                                  * thanks, metze, for explaining this */
 210
 211                                 if (!cur->meta_data_ctr) {
 212                                         break;
 213                                 }
 214                                 if (cur->meta_data_ctr->count !=
 215                                     cur->object.attribute_ctr.num_attributes) {
 216                                         break;
 217                                 }
 218                                 kvno = cur->meta_data_ctr->meta_data[i].version;
 219                                 break;
 220                         case DRSUAPI_ATTRIBUTE_ntPwdHistory:
 221                                 pwd_history_len = blob->length / 16;
 222                                 pwd_history = blob->data;
 223                                 break;
 224                         case DRSUAPI_ATTRIBUTE_userPrincipalName:
 225                                 pull_string_talloc(mem_ctx, NULL, 0, &upn,
 226                                                    blob->data, blob->length,
 227                                                    STR_UNICODE);
 228                                 break;
 229                         case DRSUAPI_ATTRIBUTE_sAMAccountName:
 230                                 pull_string_talloc(mem_ctx, NULL, 0, &name,
 231                                                    blob->data, blob->length,
 232                                                    STR_UNICODE);
 233                                 break;
 234                         case DRSUAPI_ATTRIBUTE_sAMAccountType:
 235                                 sam_type = IVAL(blob->data, 0);
 236                                 break;
 237                         case DRSUAPI_ATTRIBUTE_userAccountControl:
 238                                 uacc = IVAL(blob->data, 0);
 239                                 break;
 240                         default:
 241                                 break;
 242                 }
 243         }
 244
 245         if (!name) {
 246                 DEBUG(10, ("no name (sAMAccountName) found - skipping.\n"));
 247                 return NT_STATUS_OK;
 248         }
 249
 250         if (!got_pwd) {
 251                 DEBUG(10, ("no password (unicodePwd) found - skipping.\n"));
 252                 return NT_STATUS_OK;
 253         }
 254
 255         DEBUG(1,("#%02d: %s:%d, ", ctx->count, name, kvno));
 256         DEBUGADD(1,("sAMAccountType: 0x%08x, userAccountControl: 0x%08x",
 257                 sam_type, uacc));
 258         if (upn) {
 259                 DEBUGADD(1,(", upn: %s", upn));
 260         }
 261         DEBUGADD(1,("\n"));
 262
 263         status = add_to_keytab_entries(mem_ctx, ctx, kvno, name, NULL,
 264                                        ENCTYPE_ARCFOUR_HMAC,
 265                                        data_blob_talloc(mem_ctx, nt_passwd, 16));
 266
 267         if (!NT_STATUS_IS_OK(status)) {
 268                 return status;
 269         }
 270
 271         if ((kvno < 0) && (kvno < pwd_history_len)) {
 272                 return status;
 273         }
 274
 275         /* add password history */
 276
 277         /* skip first entry */
 278         if (got_pwd) {
 279                 kvno--;
 280                 i = 1;
 281         } else {
 282                 i = 0;
 283         }
 284
 285         for (; i<pwd_history_len; i++) {
 286                 status = add_to_keytab_entries(mem_ctx, ctx, kvno--, name, NULL,
 287                                 ENCTYPE_ARCFOUR_HMAC,
 288                                 data_blob_talloc(mem_ctx, &pwd_history[i*16], 16));
 289                 if (!NT_STATUS_IS_OK(status)) {
 290                         break;
 291                 }
 292         }
 293
 294         return status;
 295 }
 296
 297 /****************************************************************
 298 ****************************************************************/
 299
 300 static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
 301                                        TALLOC_CTX *mem_ctx,
 302                                        struct drsuapi_DsReplicaObjectListItemEx *cur,
 303                                        struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
 304 {
 305         NTSTATUS status = NT_STATUS_OK;
 306         struct libnet_keytab_context *keytab_ctx =
 307                 (struct libnet_keytab_context *)ctx->private_data;
 308
 309         for (; cur; cur = cur->next_object) {
 310                 status = parse_object(mem_ctx, keytab_ctx, cur);
 311                 if (!NT_STATUS_IS_OK(status)) {
 312                         goto out;
 313                 }
 314         }
 315
 316  out:
 317         return status;
 318 }
 319
 320 #else
 321
 322 static NTSTATUS keytab_startup(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 323                                struct replUpToDateVectorBlob **pold_utdv)
 324 {
 325         return NT_STATUS_NOT_SUPPORTED;
 326 }
 327
 328 static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 329                               struct replUpToDateVectorBlob *new_utdv)
 330 {
 331         return NT_STATUS_NOT_SUPPORTED;
 332 }
 333
 334 static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
 335                                        TALLOC_CTX *mem_ctx,
 336                                        struct drsuapi_DsReplicaObjectListItemEx *cur,
 337                                        struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
 338 {
 339         return NT_STATUS_NOT_SUPPORTED;
 340 }
 341 #endif /* defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC) */
 342
 343 const struct dssync_ops libnet_dssync_keytab_ops = {
 344         .startup                = keytab_startup,
 345         .process_objects        = keytab_process_objects,
 346         .finish                 = keytab_finish,
 347 };