source4/libnet/libnet_join.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    Copyright (C) Stefan Metzmacher      2004
   5    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2005
   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 "libnet/libnet.h"
  24 #include "librpc/gen_ndr/ndr_samr.h"
  25 #include "lib/crypto/crypto.h"
  26 #include "lib/ldb/include/ldb.h"
  27 #include "include/secrets.h"
  28
  29 /*
  30  * do a domain join using DCERPC/SAMR calls
  31  * 1. connect to the SAMR pipe of users domain PDC (maybe a standalone server or workstation)
  32  *    is it correct to contact the the pdc of the domain of the user who's password should be set?
  33  * 2. do a samr_Connect to get a policy handle
  34  * 3. do a samr_LookupDomain to get the domain sid
  35  * 4. do a samr_OpenDomain to get a domain handle
  36  * 5. do a samr_CreateAccount to try and get a new account
  37  *
  38  * If that fails, do:
  39  * 5.1. do a samr_LookupNames to get the users rid
  40  * 5.2. do a samr_OpenUser to get a user handle
  41  *
  42  * 6. call libnet_SetPassword_samr_handle to set the password
  43  *
  44  * 7. do a samrSetUserInfo to set the account flags
  45  */
  46 static NTSTATUS libnet_JoinDomain_samr(struct libnet_context *ctx,
  47                                        TALLOC_CTX *mem_ctx, union libnet_JoinDomain *r)
  48 {
  49         NTSTATUS status;
  50         union libnet_rpc_connect c;
  51         struct samr_Connect sc;
  52         struct policy_handle p_handle;
  53         struct samr_LookupDomain ld;
  54         struct samr_String d_name;
  55         struct samr_OpenDomain od;
  56         struct policy_handle d_handle;
  57         struct samr_LookupNames ln;
  58         struct samr_OpenUser ou;
  59         struct samr_CreateUser2 cu;
  60         struct policy_handle u_handle;
  61         struct samr_QueryUserInfo qui;
  62         struct samr_SetUserInfo sui;
  63         union samr_UserInfo u_info;
  64         union libnet_SetPassword r2;
  65         struct samr_GetUserPwInfo pwp;
  66         struct samr_String samr_account_name;
  67
  68         uint32_t acct_flags;
  69         uint32_t rid, access_granted;
  70         int policy_min_pw_len = 0;
  71
  72         /* prepare connect to the SAMR pipe of users domain PDC */
  73         c.pdc.level                     = LIBNET_RPC_CONNECT_PDC;
  74         c.pdc.in.domain_name            = r->samr.in.domain_name;
  75         c.pdc.in.dcerpc_iface_name      = DCERPC_SAMR_NAME;
  76         c.pdc.in.dcerpc_iface_uuid      = DCERPC_SAMR_UUID;
  77         c.pdc.in.dcerpc_iface_version   = DCERPC_SAMR_VERSION;
  78
  79         /* 1. connect to the SAMR pipe of users domain PDC (maybe a standalone server or workstation) */
  80         status = libnet_rpc_connect(ctx, mem_ctx, &c);
  81         if (!NT_STATUS_IS_OK(status)) {
  82                 r->samr.out.error_string = talloc_asprintf(mem_ctx,
  83                                                 "Connection to SAMR pipe of PDC of domain '%s' failed: %s\n",
  84                                                 r->samr.in.domain_name, nt_errstr(status));
  85                 return status;
  86         }
  87
  88         /* prepare samr_Connect */
  89         ZERO_STRUCT(p_handle);
  90         sc.in.system_name = NULL;
  91         sc.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
  92         sc.out.connect_handle = &p_handle;
  93
  94         /* 2. do a samr_Connect to get a policy handle */
  95         status = dcerpc_samr_Connect(c.pdc.out.dcerpc_pipe, mem_ctx, &sc);
  96         if (!NT_STATUS_IS_OK(status)) {
  97                 r->samr.out.error_string = talloc_asprintf(mem_ctx,
  98                                                 "samr_Connect failed: %s\n",
  99                                                 nt_errstr(status));
 100                 goto disconnect;
 101         }
 102
 103         /* check result of samr_Connect */
 104         if (!NT_STATUS_IS_OK(sc.out.result)) {
 105                 r->samr.out.error_string = talloc_asprintf(mem_ctx,
 106                                                 "samr_Connect failed: %s\n",
 107                                                 nt_errstr(sc.out.result));
 108                 status = sc.out.result;
 109                 goto disconnect;
 110         }
 111
 112         /* prepare samr_LookupDomain */
 113         d_name.string = r->samr.in.domain_name;
 114         ld.in.connect_handle = &p_handle;
 115         ld.in.domain_name = &d_name;
 116
 117         /* 3. do a samr_LookupDomain to get the domain sid */
 118         status = dcerpc_samr_LookupDomain(c.pdc.out.dcerpc_pipe, mem_ctx, &ld);
 119         if (!NT_STATUS_IS_OK(status)) {
 120                 r->samr.out.error_string = talloc_asprintf(mem_ctx,
 121                                                 "samr_LookupDomain for [%s] failed: %s\n",
 122                                                 r->samr.in.domain_name, nt_errstr(status));
 123                 goto disconnect;
 124         }
 125
 126         /* check result of samr_LookupDomain */
 127         if (!NT_STATUS_IS_OK(ld.out.result)) {
 128                 r->samr.out.error_string = talloc_asprintf(mem_ctx,
 129                                                 "samr_LookupDomain for [%s] failed: %s\n",
 130                                                 r->samr.in.domain_name, nt_errstr(ld.out.result));
 131                 status = ld.out.result;
 132                 goto disconnect;
 133         }
 134
 135         /* prepare samr_OpenDomain */
 136         ZERO_STRUCT(d_handle);
 137         od.in.connect_handle = &p_handle;
 138         od.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 139         od.in.sid = ld.out.sid;
 140         od.out.domain_handle = &d_handle;
 141
 142         /* 4. do a samr_OpenDomain to get a domain handle */
 143         status = dcerpc_samr_OpenDomain(c.pdc.out.dcerpc_pipe, mem_ctx, &od);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 r->samr.out.error_string = talloc_asprintf(mem_ctx,
 146                                                 "samr_OpenDomain for [%s] failed: %s\n",
 147                                                 r->samr.in.domain_name, nt_errstr(status));
 148                 goto disconnect;
 149         }
 150
 151         /* prepare samr_CreateUser2 */
 152         ZERO_STRUCT(u_handle);
 153         cu.in.domain_handle  = &d_handle;
 154         cu.in.access_mask     = SEC_FLAG_MAXIMUM_ALLOWED;
 155         samr_account_name.string = r->samr.in.account_name;
 156         cu.in.account_name    = &samr_account_name;
 157         cu.in.acct_flags      = r->samr.in.acct_type;
 158         cu.out.user_handle    = &u_handle;
 159         cu.out.rid            = &rid;
 160         cu.out.access_granted = &access_granted;
 161
 162         /* 4. do a samr_CreateUser2 to get an account handle, or an error */
 163         status = dcerpc_samr_CreateUser2(c.pdc.out.dcerpc_pipe, mem_ctx, &cu);
 164         if (!NT_STATUS_IS_OK(status) && !NT_STATUS_EQUAL(status, NT_STATUS_USER_EXISTS)) {
 165                         r->samr.out.error_string = talloc_asprintf(mem_ctx,
 166                                                                    "samr_CreateUser2 for [%s] failed: %s\n",
 167                                                                    r->samr.in.domain_name, nt_errstr(status));
 168                         goto disconnect;
 169
 170         } else if (NT_STATUS_EQUAL(status, NT_STATUS_USER_EXISTS)) {
 171                 /* prepare samr_LookupNames */
 172                 ln.in.domain_handle = &d_handle;
 173                 ln.in.num_names = 1;
 174                 ln.in.names = talloc_array(mem_ctx, struct samr_String, 1);
 175                 if (!ln.in.names) {
 176                         r->samr.out.error_string = "Out of Memory";
 177                         return NT_STATUS_NO_MEMORY;
 178                 }
 179                 ln.in.names[0].string = r->samr.in.account_name;
 180
 181                 /* 5. do a samr_LookupNames to get the users rid */
 182                 status = dcerpc_samr_LookupNames(c.pdc.out.dcerpc_pipe, mem_ctx, &ln);
 183                 if (!NT_STATUS_IS_OK(status)) {
 184                         r->samr.out.error_string = talloc_asprintf(mem_ctx,
 185                                                                    "samr_LookupNames for [%s] failed: %s\n",
 186                                                 r->samr.in.account_name, nt_errstr(status));
 187                         goto disconnect;
 188                 }
 189
 190
 191                 /* check if we got one RID for the user */
 192                 if (ln.out.rids.count != 1) {
 193                         r->samr.out.error_string = talloc_asprintf(mem_ctx,
 194                                                                    "samr_LookupNames for [%s] returns %d RIDs\n",
 195                                                                    r->samr.in.account_name, ln.out.rids.count);
 196                         status = NT_STATUS_INVALID_PARAMETER;
 197                         goto disconnect;
 198                 }
 199
 200                 /* prepare samr_OpenUser */
 201                 ZERO_STRUCT(u_handle);
 202                 ou.in.domain_handle = &d_handle;
 203                 ou.in.access_mask = SEC_FLAG_MAXIMUM_ALLOWED;
 204                 ou.in.rid = ln.out.rids.ids[0];
 205                 ou.out.user_handle = &u_handle;
 206
 207                 /* 6. do a samr_OpenUser to get a user handle */
 208                 status = dcerpc_samr_OpenUser(c.pdc.out.dcerpc_pipe, mem_ctx, &ou);
 209                 if (!NT_STATUS_IS_OK(status)) {
 210                         r->samr.out.error_string = talloc_asprintf(mem_ctx,
 211                                                                    "samr_OpenUser for [%s] failed: %s\n",
 212                                                                    r->samr.in.account_name, nt_errstr(status));
 213                         goto disconnect;
 214                 }
 215         }
 216
 217         pwp.in.user_handle = &u_handle;
 218
 219         status = dcerpc_samr_GetUserPwInfo(c.pdc.out.dcerpc_pipe, mem_ctx, &pwp);
 220         if (NT_STATUS_IS_OK(status)) {
 221                 policy_min_pw_len = pwp.out.info.min_password_length;
 222         }
 223
 224         r->samr.out.join_password = generate_random_str(mem_ctx, MAX(8, policy_min_pw_len));
 225
 226         r2.samr_handle.level            = LIBNET_SET_PASSWORD_SAMR_HANDLE;
 227         r2.samr_handle.in.account_name  = r->samr.in.account_name;
 228         r2.samr_handle.in.newpassword   = r->samr.out.join_password;
 229         r2.samr_handle.in.user_handle   = &u_handle;
 230         r2.samr_handle.in.dcerpc_pipe   = c.pdc.out.dcerpc_pipe;
 231
 232         status = libnet_SetPassword(ctx, mem_ctx, &r2);
 233
 234         r->samr.out.error_string = r2.samr_handle.out.error_string;
 235
 236         if (!NT_STATUS_IS_OK(status)) {
 237                 goto disconnect;
 238         }
 239
 240         /* prepare samr_SetUserInfo level 23 */
 241         qui.in.user_handle = &u_handle;
 242         qui.in.level = 16;
 243
 244         status = dcerpc_samr_QueryUserInfo(c.pdc.out.dcerpc_pipe, mem_ctx, &qui);
 245         if (!NT_STATUS_IS_OK(status)) {
 246                 r->samr.out.error_string
 247                         = talloc_asprintf(mem_ctx,
 248                                           "samr_QueryUserInfo for [%s] failed: %s\n",
 249                                           r->samr.in.account_name, nt_errstr(status));
 250                 goto disconnect;
 251         }
 252         if (!qui.out.info) {
 253                 status = NT_STATUS_INVALID_PARAMETER;
 254                 r->samr.out.error_string
 255                         = talloc_asprintf(mem_ctx,
 256                                           "samr_QueryUserInfo failed to return qui.out.info for [%s]: %s\n",
 257                                           r->samr.in.account_name, nt_errstr(status));
 258                 goto disconnect;
 259         }
 260
 261         if ((qui.out.info->info16.acct_flags & (ACB_WSTRUST | ACB_SVRTRUST | ACB_DOMTRUST))
 262             != r->samr.in.acct_type) {
 263                 acct_flags = (qui.out.info->info16.acct_flags & ~(ACB_WSTRUST | ACB_SVRTRUST | ACB_DOMTRUST))
 264                               | r->samr.in.acct_type;
 265         } else {
 266                 acct_flags = qui.out.info->info16.acct_flags;
 267         }
 268
 269         acct_flags = (acct_flags & ~ACB_DISABLED);
 270
 271         if (acct_flags != qui.out.info->info16.acct_flags) {
 272                 ZERO_STRUCT(u_info);
 273                 u_info.info16.acct_flags = acct_flags;
 274
 275                 sui.in.user_handle = &u_handle;
 276                 sui.in.info = &u_info;
 277                 sui.in.level = 16;
 278
 279                 dcerpc_samr_SetUserInfo(c.pdc.out.dcerpc_pipe, mem_ctx, &sui);
 280                 if (!NT_STATUS_IS_OK(status)) {
 281                         r->samr.out.error_string
 282                                 = talloc_asprintf(mem_ctx,
 283                                                   "samr_SetUserInfo for [%s] failed to remove ACB_DISABLED flag: %s\n",
 284                                                   r->samr.in.account_name, nt_errstr(status));
 285                         goto disconnect;
 286                 }
 287         }
 288
 289 disconnect:
 290         /* close connection */
 291         talloc_free(c.pdc.out.dcerpc_pipe);
 292
 293         return status;
 294 }
 295
 296 static NTSTATUS libnet_JoinDomain_generic(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_JoinDomain *r)
 297 {
 298         NTSTATUS status;
 299         union libnet_JoinDomain r2;
 300
 301         r2.samr.level           = LIBNET_JOIN_DOMAIN_SAMR;
 302         r2.samr.in.account_name = r->generic.in.account_name;
 303         r2.samr.in.domain_name  = r->generic.in.domain_name;
 304         r2.samr.in.acct_type    = r->generic.in.acct_type;
 305
 306         status = libnet_JoinDomain(ctx, mem_ctx, &r2);
 307
 308         r->generic.out.error_string = r2.samr.out.error_string;
 309         r->generic.out.join_password = r2.samr.out.join_password;
 310
 311         return status;
 312 }
 313
 314 NTSTATUS libnet_JoinDomain(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_JoinDomain *r)
 315 {
 316         switch (r->generic.level) {
 317                 case LIBNET_JOIN_DOMAIN_GENERIC:
 318                         return libnet_JoinDomain_generic(ctx, mem_ctx, r);
 319                 case LIBNET_JOIN_DOMAIN_SAMR:
 320                         return libnet_JoinDomain_samr(ctx, mem_ctx, r);
 321         }
 322
 323         return NT_STATUS_INVALID_LEVEL;
 324 }
 325
 326
 327 static NTSTATUS libnet_Join_primary_domain(struct libnet_context *ctx,
 328                                            TALLOC_CTX *mem_ctx,
 329                                            union libnet_Join *r)
 330 {
 331         NTSTATUS status;
 332         int ret;
 333
 334         struct ldb_context *ldb;
 335         union libnet_JoinDomain r2;
 336         const char *base_dn = "cn=Primary Domains";
 337         const struct ldb_val *prior_secret;
 338         const char *prior_modified_time;
 339         struct ldb_message **msgs, *msg;
 340         char *sct;
 341         const char *attrs[] = {
 342                 "whenChanged",
 343                 "secret",
 344                 "priorSecret"
 345                 "priorChanged",
 346                 NULL
 347         };
 348
 349         r2.generic.level = LIBNET_JOIN_DOMAIN_GENERIC;
 350
 351         if (r->generic.in.secure_channel_type == SEC_CHAN_BDC) {
 352                 r2.generic.in.acct_type = ACB_SVRTRUST;
 353         } else if (r->generic.in.secure_channel_type == SEC_CHAN_WKSTA) {
 354                 r2.generic.in.acct_type = ACB_WSTRUST;
 355         }
 356         r2.generic.in.domain_name  = r->generic.in.domain_name;
 357
 358         r2.generic.in.account_name = talloc_asprintf(mem_ctx, "%s$", lp_netbios_name());
 359
 360         /* Local secrets are stored in secrets.ldb */
 361         ldb = secrets_db_connect(mem_ctx);
 362
 363         /* join domain */
 364         status = libnet_JoinDomain(ctx, mem_ctx, &r2);
 365
 366         r->generic.out.error_string = r2.generic.out.error_string;
 367
 368         /* store in secrets.ldb or samdb.ldb, depending on secret type */
 369         if (!NT_STATUS_IS_OK(status)) {
 370                 return status;
 371         }
 372
 373         sct = talloc_asprintf(mem_ctx, "%d", r->generic.in.secure_channel_type);
 374         msg = ldb_msg_new(mem_ctx);
 375
 376         /* search for the secret record */
 377         ret = gendb_search(ldb,
 378                            mem_ctx, base_dn, &msgs, attrs,
 379                            SECRETS_PRIMARY_DOMAIN_FILTER,
 380                            r->generic.in.domain_name);
 381         if (ret == 0) {
 382                 msg->dn = talloc_asprintf(mem_ctx, "flatname=%s,%s",
 383                                           r->generic.in.domain_name,
 384                                           base_dn);
 385
 386                 samdb_msg_add_string(ldb, mem_ctx, msg, "flatname", r->generic.in.domain_name);
 387                 samdb_msg_add_string(ldb, mem_ctx, msg, "objectClass", "primaryDomain");
 388                 samdb_msg_add_string(ldb, mem_ctx, msg, "secret", r2.generic.out.join_password);
 389
 390                 samdb_msg_add_string(ldb, mem_ctx, msg, "samAccountName", r2.generic.in.account_name);
 391
 392                 samdb_msg_add_string(ldb, mem_ctx, msg, "secureChannelType", sct);
 393
 394                 /* create the secret */
 395                 ret = samdb_add(ldb, mem_ctx, msg);
 396                 if (ret != 0) {
 397                         r->generic.out.error_string
 398                                 = talloc_asprintf(mem_ctx,
 399                                                   "Failed to create secret record %s\n",
 400                                                   msg->dn);
 401                         return NT_STATUS_INTERNAL_DB_CORRUPTION;
 402                 }
 403                 return NT_STATUS_OK;
 404         } else if (ret != 1) {
 405                 r->generic.out.error_string
 406                         = talloc_asprintf(mem_ctx,
 407                                           "Found %d records matching cn=%s under DN %s\n", ret,
 408                                           r->generic.in.domain_name, base_dn);
 409                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 410         }
 411
 412         msg->dn = msgs[0]->dn;
 413
 414         prior_secret = ldb_msg_find_ldb_val(msgs[0], "secret");
 415         if (prior_secret) {
 416                 samdb_msg_set_value(ldb, mem_ctx, msg, "priorSecret", prior_secret);
 417         }
 418         samdb_msg_set_string(ldb, mem_ctx, msg, "secret", r2.generic.out.join_password);
 419
 420         prior_modified_time = ldb_msg_find_string(msgs[0],
 421                                                  "whenChanged", NULL);
 422         if (prior_modified_time) {
 423                 samdb_msg_set_string(ldb, mem_ctx, msg, "priorWhenChanged",
 424                                      prior_modified_time);
 425         }
 426
 427         samdb_msg_set_string(ldb, mem_ctx, msg, "samAccountName", r2.generic.in.account_name);
 428         samdb_msg_set_string(ldb, mem_ctx, msg, "secureChannelType", sct);
 429
 430         /* update the secret */
 431         ret = samdb_replace(ldb, mem_ctx, msg);
 432         if (ret != 0) {
 433                 DEBUG(0,("Failed to create secret record %s\n", msg->dn));
 434                 return NT_STATUS_INTERNAL_DB_CORRUPTION;
 435         }
 436         return NT_STATUS_OK;
 437 }
 438
 439 NTSTATUS libnet_Join_generic(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_Join *r)
 440 {
 441         NTSTATUS nt_status;
 442         union libnet_Join r2;
 443         r2.generic.in.secure_channel_type = r->generic.in.secure_channel_type;
 444         r2.generic.in.domain_name = r->generic.in.domain_name;
 445
 446         if ((r->generic.in.secure_channel_type == SEC_CHAN_WKSTA)
 447             || (r->generic.in.secure_channel_type == SEC_CHAN_BDC)) {
 448                 r2.generic.level = LIBNET_JOIN_PRIMARY;
 449                 nt_status = libnet_Join(ctx, mem_ctx, &r2);
 450         } else {
 451                 r->generic.out.error_string
 452                         = talloc_asprintf(mem_ctx, "Invalid secure channel type specified (%08X) attempting to join domain %s",
 453                                          r->generic.in.secure_channel_type, r->generic.in.domain_name);
 454                 return NT_STATUS_INVALID_PARAMETER;
 455         }
 456         r->generic.out.error_string = r2.generic.out.error_string;
 457         return nt_status;
 458 }
 459
 460 NTSTATUS libnet_Join(struct libnet_context *ctx, TALLOC_CTX *mem_ctx, union libnet_Join *r)
 461 {
 462         switch (r->generic.level) {
 463         case LIBNET_JOIN_GENERIC:
 464                 return libnet_Join_generic(ctx, mem_ctx, r);
 465         case LIBNET_JOIN_PRIMARY:
 466                 return libnet_Join_primary_domain(ctx, mem_ctx, r);
 467         }
 468
 469         return NT_STATUS_INVALID_LEVEL;
 470 }
 471