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, mem_ctx);
  77         if (entry) {
  78                 enum ndr_err_code ndr_err;
  79                 old_utdv = talloc(mem_ctx, struct replUpToDateVectorBlob);
  80
  81                 ndr_err = ndr_pull_struct_blob(&entry->password, old_utdv,
  82                                 old_utdv,
  83                                 (ndr_pull_flags_fn_t)ndr_pull_replUpToDateVectorBlob);
  84                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  85                         NTSTATUS status = ndr_map_error2ntstatus(ndr_err);
  86                         ctx->error_message = talloc_asprintf(mem_ctx,
  87                                         "Failed to pull UpToDateVector: %s",
  88                                         nt_errstr(status));
  89                         return status;
  90                 }
  91
  92                 if (DEBUGLEVEL >= 10) {
  93                         NDR_PRINT_DEBUG(replUpToDateVectorBlob, old_utdv);
  94                 }
  95         }
  96
  97         if (pold_utdv) {
  98                 *pold_utdv = old_utdv;
  99         }
 100
 101         return NT_STATUS_OK;
 102 }
 103
 104 static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 105                               struct replUpToDateVectorBlob *new_utdv)
 106 {
 107         NTSTATUS status = NT_STATUS_OK;
 108         krb5_error_code ret = 0;
 109         struct libnet_keytab_context *keytab_ctx =
 110                 (struct libnet_keytab_context *)ctx->private_data;
 111
 112         if (new_utdv) {
 113                 enum ndr_err_code ndr_err;
 114                 DATA_BLOB blob;
 115
 116                 if (DEBUGLEVEL >= 10) {
 117                         NDR_PRINT_DEBUG(replUpToDateVectorBlob, new_utdv);
 118                 }
 119
 120                 ndr_err = ndr_push_struct_blob(&blob, mem_ctx, new_utdv,
 121                                 (ndr_push_flags_fn_t)ndr_push_replUpToDateVectorBlob);
 122                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 123                         status = ndr_map_error2ntstatus(ndr_err);
 124                         ctx->error_message = talloc_asprintf(mem_ctx,
 125                                         "Failed to push UpToDateVector: %s",
 126                                         nt_errstr(status));
 127                         goto done;
 128                 }
 129
 130                 status = add_to_keytab_entries(mem_ctx, keytab_ctx, 0,
 131                                                ctx->nc_dn, "UTDV",
 132                                                ENCTYPE_NULL, blob);
 133                 if (!NT_STATUS_IS_OK(status)) {
 134                         goto done;
 135                 }
 136         }
 137
 138         ret = libnet_keytab_add(keytab_ctx);
 139         if (ret) {
 140                 status = krb5_to_nt_status(ret);
 141                 ctx->error_message = talloc_asprintf(mem_ctx,
 142                         "Failed to add entries to keytab %s: %s",
 143                         keytab_ctx->keytab_name, error_message(ret));
 144                 goto done;
 145         }
 146
 147         ctx->result_message = talloc_asprintf(mem_ctx,
 148                 "Vampired %d accounts to keytab %s",
 149                 keytab_ctx->count,
 150                 keytab_ctx->keytab_name);
 151
 152 done:
 153         TALLOC_FREE(keytab_ctx);
 154         return status;
 155 }
 156
 157 /****************************************************************
 158 ****************************************************************/
 159
 160 static NTSTATUS parse_object(TALLOC_CTX *mem_ctx,
 161                              struct libnet_keytab_context *ctx,
 162                              struct drsuapi_DsReplicaObjectListItemEx *cur)
 163 {
 164         NTSTATUS status = NT_STATUS_OK;
 165         uchar nt_passwd[16];
 166         DATA_BLOB *blob;
 167         int i = 0;
 168         struct drsuapi_DsReplicaAttribute *attr;
 169         bool got_pwd = false;
 170
 171         char *upn = NULL;
 172         char *name = NULL;
 173         uint32_t kvno = 0;
 174         uint32_t uacc = 0;
 175         uint32_t sam_type = 0;
 176
 177         uint32_t pwd_history_len = 0;
 178         uint8_t *pwd_history = NULL;
 179
 180         ZERO_STRUCT(nt_passwd);
 181
 182         for (i=0; i < cur->object.attribute_ctr.num_attributes; i++) {
 183
 184                 attr = &cur->object.attribute_ctr.attributes[i];
 185
 186                 if (attr->value_ctr.num_values != 1) {
 187                         continue;
 188                 }
 189
 190                 if (!attr->value_ctr.values[0].blob) {
 191                         continue;
 192                 }
 193
 194                 blob = attr->value_ctr.values[0].blob;
 195
 196                 switch (attr->attid) {
 197                         case DRSUAPI_ATTRIBUTE_unicodePwd:
 198
 199                                 if (blob->length != 16) {
 200                                         break;
 201                                 }
 202
 203                                 memcpy(&nt_passwd, blob->data, 16);
 204                                 got_pwd = true;
 205
 206                                 /* pick the kvno from the meta_data version,
 207                                  * thanks, metze, for explaining this */
 208
 209                                 if (!cur->meta_data_ctr) {
 210                                         break;
 211                                 }
 212                                 if (cur->meta_data_ctr->count !=
 213                                     cur->object.attribute_ctr.num_attributes) {
 214                                         break;
 215                                 }
 216                                 kvno = cur->meta_data_ctr->meta_data[i].version;
 217                                 break;
 218                         case DRSUAPI_ATTRIBUTE_ntPwdHistory:
 219                                 pwd_history_len = blob->length / 16;
 220                                 pwd_history = blob->data;
 221                                 break;
 222                         case DRSUAPI_ATTRIBUTE_userPrincipalName:
 223                                 pull_string_talloc(mem_ctx, NULL, 0, &upn,
 224                                                    blob->data, blob->length,
 225                                                    STR_UNICODE);
 226                                 break;
 227                         case DRSUAPI_ATTRIBUTE_sAMAccountName:
 228                                 pull_string_talloc(mem_ctx, NULL, 0, &name,
 229                                                    blob->data, blob->length,
 230                                                    STR_UNICODE);
 231                                 break;
 232                         case DRSUAPI_ATTRIBUTE_sAMAccountType:
 233                                 sam_type = IVAL(blob->data, 0);
 234                                 break;
 235                         case DRSUAPI_ATTRIBUTE_userAccountControl:
 236                                 uacc = IVAL(blob->data, 0);
 237                                 break;
 238                         default:
 239                                 break;
 240                 }
 241         }
 242
 243         if (!got_pwd || !name) {
 244                 return NT_STATUS_OK;
 245         }
 246
 247         DEBUG(1,("#%02d: %s:%d, ", ctx->count, name, kvno));
 248         DEBUGADD(1,("sAMAccountType: 0x%08x, userAccountControl: 0x%08x ",
 249                 sam_type, uacc));
 250         if (upn) {
 251                 DEBUGADD(1,("upn: %s", upn));
 252         }
 253         DEBUGADD(1,("\n"));
 254
 255         status = add_to_keytab_entries(mem_ctx, ctx, kvno, name, NULL,
 256                                        ENCTYPE_ARCFOUR_HMAC,
 257                                        data_blob_talloc(mem_ctx, nt_passwd, 16));
 258
 259         if (!NT_STATUS_IS_OK(status)) {
 260                 return status;
 261         }
 262
 263         if ((kvno < 0) && (kvno < pwd_history_len)) {
 264                 return status;
 265         }
 266
 267         /* add password history */
 268
 269         /* skip first entry */
 270         if (got_pwd) {
 271                 kvno--;
 272                 i = 1;
 273         } else {
 274                 i = 0;
 275         }
 276
 277         for (; i<pwd_history_len; i++) {
 278                 status = add_to_keytab_entries(mem_ctx, ctx, kvno--, name, NULL,
 279                                 ENCTYPE_ARCFOUR_HMAC,
 280                                 data_blob_talloc(mem_ctx, &pwd_history[i*16], 16));
 281                 if (!NT_STATUS_IS_OK(status)) {
 282                         break;
 283                 }
 284         }
 285
 286         return status;
 287 }
 288
 289 /****************************************************************
 290 ****************************************************************/
 291
 292 static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
 293                                        TALLOC_CTX *mem_ctx,
 294                                        struct drsuapi_DsReplicaObjectListItemEx *cur,
 295                                        struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
 296 {
 297         NTSTATUS status = NT_STATUS_OK;
 298         struct libnet_keytab_context *keytab_ctx =
 299                 (struct libnet_keytab_context *)ctx->private_data;
 300
 301         for (; cur; cur = cur->next_object) {
 302                 status = parse_object(mem_ctx, keytab_ctx, cur);
 303                 if (!NT_STATUS_IS_OK(status)) {
 304                         goto out;
 305                 }
 306         }
 307
 308  out:
 309         return status;
 310 }
 311
 312 #else
 313
 314 static NTSTATUS keytab_startup(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 315                                struct replUpToDateVectorBlob **pold_utdv)
 316 {
 317         return NT_STATUS_NOT_SUPPORTED;
 318 }
 319
 320 static NTSTATUS keytab_finish(struct dssync_context *ctx, TALLOC_CTX *mem_ctx,
 321                               struct replUpToDateVectorBlob *new_utdv)
 322 {
 323         return NT_STATUS_NOT_SUPPORTED;
 324 }
 325
 326 static NTSTATUS keytab_process_objects(struct dssync_context *ctx,
 327                                        TALLOC_CTX *mem_ctx,
 328                                        struct drsuapi_DsReplicaObjectListItemEx *cur,
 329                                        struct drsuapi_DsReplicaOIDMapping_Ctr *mapping_ctr)
 330 {
 331         return NT_STATUS_NOT_SUPPORTED;
 332 }
 333 #endif /* defined(HAVE_ADS) && defined(ENCTYPE_ARCFOUR_HMAC) */
 334
 335 const struct dssync_ops libnet_dssync_keytab_ops = {
 336         .startup                = keytab_startup,
 337         .process_objects        = keytab_process_objects,
 338         .finish                 = keytab_finish,
 339 };