s3-netlogon: enable RPC-NETLOGON-ADMIN test against s3.
[ira/wip.git] / source3 / rpc_server / srv_netlog_nt.c
index 07a0b971a08d4085230c57c357f4fc8a2a020553..39912ac7e40694ef7b454cbb757be26856b45c47 100644 (file)
@@ -6,7 +6,7 @@
  *  Copyright (C) Paul Ashton                       1997.
  *  Copyright (C) Jeremy Allison               1998-2001.
  *  Copyright (C) Andrew Bartlett                   2001.
- *  Copyright (C) Guenther Deschner                2008.
+ *  Copyright (C) Guenther Deschner                2008-2009.
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
@@ -27,6 +27,7 @@
 #include "includes.h"
 #include "../libcli/auth/libcli_auth.h"
 #include "../libcli/auth/schannel_state.h"
+#include "../libcli/auth/schannel.h"
 
 extern userdom_struct current_user_info;
 
@@ -94,6 +95,68 @@ WERROR _netr_LogonControl2(pipes_struct *p,
        return _netr_LogonControl2Ex(p, &l);
 }
 
+/*************************************************************************
+ *************************************************************************/
+
+static bool wb_change_trust_creds(const char *domain, WERROR *tc_status)
+{
+       wbcErr result;
+       struct wbcAuthErrorInfo *error = NULL;
+
+       result = wbcChangeTrustCredentials(domain, &error);
+       switch (result) {
+       case WBC_ERR_WINBIND_NOT_AVAILABLE:
+               return false;
+       case WBC_ERR_DOMAIN_NOT_FOUND:
+               *tc_status = WERR_NO_SUCH_DOMAIN;
+               return true;
+       case WBC_ERR_SUCCESS:
+               *tc_status = WERR_OK;
+               return true;
+       default:
+               break;
+       }
+
+       if (error && error->nt_status != 0) {
+               *tc_status = ntstatus_to_werror(NT_STATUS(error->nt_status));
+       } else {
+               *tc_status = WERR_TRUST_FAILURE;
+       }
+       wbcFreeMemory(error);
+       return true;
+}
+
+/*************************************************************************
+ *************************************************************************/
+
+static bool wb_check_trust_creds(const char *domain, WERROR *tc_status)
+{
+       wbcErr result;
+       struct wbcAuthErrorInfo *error = NULL;
+
+       result = wbcCheckTrustCredentials(domain, &error);
+       switch (result) {
+       case WBC_ERR_WINBIND_NOT_AVAILABLE:
+               return false;
+       case WBC_ERR_DOMAIN_NOT_FOUND:
+               *tc_status = WERR_NO_SUCH_DOMAIN;
+               return true;
+       case WBC_ERR_SUCCESS:
+               *tc_status = WERR_OK;
+               return true;
+       default:
+               break;
+       }
+
+       if (error && error->nt_status != 0) {
+               *tc_status = ntstatus_to_werror(NT_STATUS(error->nt_status));
+       } else {
+               *tc_status = WERR_TRUST_FAILURE;
+       }
+       wbcFreeMemory(error);
+       return true;
+}
+
 /****************************************************************
  _netr_LogonControl2Ex
 ****************************************************************/
@@ -112,106 +175,201 @@ WERROR _netr_LogonControl2Ex(pipes_struct *p,
        struct netr_NETLOGON_INFO_1 *info1;
        struct netr_NETLOGON_INFO_2 *info2;
        struct netr_NETLOGON_INFO_3 *info3;
+       struct netr_NETLOGON_INFO_4 *info4;
        const char *fn;
+       uint32_t acct_ctrl;
 
        switch (p->hdr_req.opnum) {
-               case NDR_NETR_LOGONCONTROL:
-                       fn = "_netr_LogonControl";
-                       break;
-               case NDR_NETR_LOGONCONTROL2:
-                       fn = "_netr_LogonControl2";
-                       break;
-               case NDR_NETR_LOGONCONTROL2EX:
-                       fn = "_netr_LogonControl2Ex";
-                       break;
-               default:
-                       return WERR_INVALID_PARAM;
+       case NDR_NETR_LOGONCONTROL:
+               fn = "_netr_LogonControl";
+               break;
+       case NDR_NETR_LOGONCONTROL2:
+               fn = "_netr_LogonControl2";
+               break;
+       case NDR_NETR_LOGONCONTROL2EX:
+               fn = "_netr_LogonControl2Ex";
+               break;
+       default:
+               return WERR_INVALID_PARAM;
+       }
+
+       acct_ctrl = pdb_get_acct_ctrl(p->server_info->sam_account);
+
+       switch (r->in.function_code) {
+       case NETLOGON_CONTROL_TC_VERIFY:
+       case NETLOGON_CONTROL_CHANGE_PASSWORD:
+       case NETLOGON_CONTROL_REDISCOVER:
+               if ((geteuid() != sec_initial_uid()) &&
+                   !nt_token_check_domain_rid(p->server_info->ptok, DOMAIN_RID_ADMINS) &&
+                   !nt_token_check_sid(&global_sid_Builtin_Administrators, p->server_info->ptok) &&
+                   !(acct_ctrl & (ACB_WSTRUST | ACB_SVRTRUST))) {
+                       return WERR_ACCESS_DENIED;
+               }
+               break;
+       default:
+               break;
        }
 
        tc_status = WERR_NO_SUCH_DOMAIN;
 
        switch (r->in.function_code) {
-               case NETLOGON_CONTROL_TC_QUERY:
-                       domain = r->in.data->domain;
+       case NETLOGON_CONTROL_QUERY:
+               tc_status = WERR_OK;
+               break;
+       case NETLOGON_CONTROL_REPLICATE:
+       case NETLOGON_CONTROL_SYNCHRONIZE:
+       case NETLOGON_CONTROL_PDC_REPLICATE:
+       case NETLOGON_CONTROL_BACKUP_CHANGE_LOG:
+       case NETLOGON_CONTROL_BREAKPOINT:
+               if (acct_ctrl & ACB_NORMAL) {
+                       return WERR_NOT_SUPPORTED;
+               } else if (acct_ctrl & (ACB_WSTRUST | ACB_SVRTRUST)) {
+                       return WERR_ACCESS_DENIED;
+               } else {
+                       return WERR_ACCESS_DENIED;
+               }
+       case NETLOGON_CONTROL_TRUNCATE_LOG:
+               if (acct_ctrl & ACB_NORMAL) {
+                       break;
+               } else if (acct_ctrl & (ACB_WSTRUST | ACB_SVRTRUST)) {
+                       return WERR_ACCESS_DENIED;
+               } else {
+                       return WERR_ACCESS_DENIED;
+               }
 
-                       if ( !is_trusted_domain( domain ) )
-                               break;
+       case NETLOGON_CONTROL_TRANSPORT_NOTIFY:
+       case NETLOGON_CONTROL_FORCE_DNS_REG:
+       case NETLOGON_CONTROL_QUERY_DNS_REG:
+               return WERR_NOT_SUPPORTED;
+       case NETLOGON_CONTROL_FIND_USER:
+               if (!r->in.data || !r->in.data->user) {
+                       return WERR_NOT_SUPPORTED;
+               }
+               break;
+       case NETLOGON_CONTROL_SET_DBFLAG:
+               if (!r->in.data) {
+                       return WERR_NOT_SUPPORTED;
+               }
+               break;
+       case NETLOGON_CONTROL_TC_VERIFY:
+               if (!r->in.data || !r->in.data->domain) {
+                       return WERR_NOT_SUPPORTED;
+               }
 
-                       if ( !get_dc_name( domain, NULL, dc_name2, &dc_ss ) ) {
-                               tc_status = WERR_NO_LOGON_SERVERS;
-                               break;
-                       }
+               if (!wb_check_trust_creds(r->in.data->domain, &tc_status)) {
+                       return WERR_NOT_SUPPORTED;
+               }
+               break;
+       case NETLOGON_CONTROL_TC_QUERY:
+               if (!r->in.data || !r->in.data->domain) {
+                       return WERR_NOT_SUPPORTED;
+               }
 
-                       dc_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dc_name2);
-                       if (!dc_name) {
-                               return WERR_NOMEM;
-                       }
+               domain = r->in.data->domain;
 
-                       tc_status = WERR_OK;
+               if (!is_trusted_domain(domain)) {
+                       break;
+               }
 
+               if (!get_dc_name(domain, NULL, dc_name2, &dc_ss)) {
+                       tc_status = WERR_NO_LOGON_SERVERS;
                        break;
+               }
 
-               case NETLOGON_CONTROL_REDISCOVER:
-                       domain = r->in.data->domain;
+               dc_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dc_name2);
+               if (!dc_name) {
+                       return WERR_NOMEM;
+               }
 
-                       if ( !is_trusted_domain( domain ) )
-                               break;
+               tc_status = WERR_OK;
 
-                       if ( !get_dc_name( domain, NULL, dc_name2, &dc_ss ) ) {
-                               tc_status = WERR_NO_LOGON_SERVERS;
-                               break;
-                       }
+               break;
 
-                       dc_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dc_name2);
-                       if (!dc_name) {
-                               return WERR_NOMEM;
-                       }
+       case NETLOGON_CONTROL_REDISCOVER:
+               if (!r->in.data || !r->in.data->domain) {
+                       return WERR_NOT_SUPPORTED;
+               }
 
-                       tc_status = WERR_OK;
+               domain = r->in.data->domain;
 
+               if (!is_trusted_domain(domain)) {
                        break;
+               }
 
-               default:
-                       /* no idea what this should be */
-                       DEBUG(0,("%s: unimplemented function level [%d]\n",
-                               fn, r->in.function_code));
-                       return WERR_UNKNOWN_LEVEL;
+               if (!get_dc_name(domain, NULL, dc_name2, &dc_ss)) {
+                       tc_status = WERR_NO_LOGON_SERVERS;
+                       break;
+               }
+
+               dc_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dc_name2);
+               if (!dc_name) {
+                       return WERR_NOMEM;
+               }
+
+               tc_status = WERR_OK;
+
+               break;
+
+       case NETLOGON_CONTROL_CHANGE_PASSWORD:
+               if (!r->in.data || !r->in.data->domain) {
+                       return WERR_NOT_SUPPORTED;
+               }
+
+               if (!wb_change_trust_creds(r->in.data->domain, &tc_status)) {
+                       return WERR_NOT_SUPPORTED;
+               }
+               break;
+
+       default:
+               /* no idea what this should be */
+               DEBUG(0,("%s: unimplemented function level [%d]\n",
+                       fn, r->in.function_code));
+               return WERR_UNKNOWN_LEVEL;
        }
 
        /* prepare the response */
 
        switch (r->in.level) {
-               case 1:
-                       info1 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_1);
-                       W_ERROR_HAVE_NO_MEMORY(info1);
+       case 1:
+               info1 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_1);
+               W_ERROR_HAVE_NO_MEMORY(info1);
 
-                       info1->flags                    = flags;
-                       info1->pdc_connection_status    = pdc_connection_status;
+               info1->flags                    = flags;
+               info1->pdc_connection_status    = pdc_connection_status;
 
-                       r->out.query->info1 = info1;
-                       break;
-               case 2:
-                       info2 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_2);
-                       W_ERROR_HAVE_NO_MEMORY(info2);
+               r->out.query->info1 = info1;
+               break;
+       case 2:
+               info2 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_2);
+               W_ERROR_HAVE_NO_MEMORY(info2);
 
-                       info2->flags                    = flags;
-                       info2->pdc_connection_status    = pdc_connection_status;
-                       info2->trusted_dc_name          = dc_name;
-                       info2->tc_connection_status     = tc_status;
+               info2->flags                    = flags;
+               info2->pdc_connection_status    = pdc_connection_status;
+               info2->trusted_dc_name          = dc_name;
+               info2->tc_connection_status     = tc_status;
 
-                       r->out.query->info2 = info2;
-                       break;
-               case 3:
-                       info3 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_3);
-                       W_ERROR_HAVE_NO_MEMORY(info3);
+               r->out.query->info2 = info2;
+               break;
+       case 3:
+               info3 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_3);
+               W_ERROR_HAVE_NO_MEMORY(info3);
 
-                       info3->flags                    = flags;
-                       info3->logon_attempts           = logon_attempts;
+               info3->flags                    = flags;
+               info3->logon_attempts           = logon_attempts;
 
-                       r->out.query->info3 = info3;
-                       break;
-               default:
-                       return WERR_UNKNOWN_LEVEL;
+               r->out.query->info3 = info3;
+               break;
+       case 4:
+               info4 = TALLOC_ZERO_P(p->mem_ctx, struct netr_NETLOGON_INFO_4);
+               W_ERROR_HAVE_NO_MEMORY(info4);
+
+               info4->trusted_dc_name          = dc_name;
+               info4->trusted_domain_name      = r->in.data->domain;
+
+               r->out.query->info4 = info4;
+               break;
+       default:
+               return WERR_UNKNOWN_LEVEL;
        }
 
         if (lp_server_role() == ROLE_DOMAIN_BDC) {
@@ -228,20 +386,47 @@ WERROR _netr_LogonControl2Ex(pipes_struct *p,
 WERROR _netr_NetrEnumerateTrustedDomains(pipes_struct *p,
                                         struct netr_NetrEnumerateTrustedDomains *r)
 {
-       struct netr_Blob trusted_domains_blob;
+       NTSTATUS status;
        DATA_BLOB blob;
+       struct trustdom_info **domains;
+       uint32_t num_domains;
+       const char **trusted_domains;
+       int i;
 
        DEBUG(6,("_netr_NetrEnumerateTrustedDomains: %d\n", __LINE__));
 
        /* set up the Trusted Domain List response */
 
-       blob = data_blob_talloc_zero(p->mem_ctx, 2);
-       trusted_domains_blob.data = blob.data;
-       trusted_domains_blob.length = blob.length;
+       become_root();
+       status = pdb_enum_trusteddoms(p->mem_ctx, &num_domains, &domains);
+       unbecome_root();
+
+       if (!NT_STATUS_IS_OK(status)) {
+               return ntstatus_to_werror(status);
+       }
 
-       DEBUG(6,("_netr_NetrEnumerateTrustedDomains: %d\n", __LINE__));
+       trusted_domains = talloc_zero_array(p->mem_ctx, const char *, num_domains + 1);
+       if (!trusted_domains) {
+               return WERR_NOMEM;
+       }
+
+       for (i = 0; i < num_domains; i++) {
+               trusted_domains[i] = talloc_strdup(trusted_domains, domains[i]->name);
+               if (!trusted_domains[i]) {
+                       TALLOC_FREE(trusted_domains);
+                       return WERR_NOMEM;
+               }
+       }
+
+       if (!push_reg_multi_sz(trusted_domains, &blob, trusted_domains)) {
+               TALLOC_FREE(trusted_domains);
+               return WERR_NOMEM;
+       }
+
+       r->out.trusted_domains_blob->data = blob.data;
+       r->out.trusted_domains_blob->length = blob.length;
 
-       *r->out.trusted_domains_blob = trusted_domains_blob;
+       DEBUG(6,("_netr_NetrEnumerateTrustedDomains: %d\n", __LINE__));
 
        return WERR_OK;
 }
@@ -251,7 +436,7 @@ WERROR _netr_NetrEnumerateTrustedDomains(pipes_struct *p,
  ******************************************************************/
 
 static NTSTATUS get_md4pw(struct samr_Password *md4pw, const char *mach_acct,
-                         uint16_t sec_chan_type, struct dom_sid *sid)
+                         enum netr_SchannelType sec_chan_type, struct dom_sid *sid)
 {
        struct samu *sampass = NULL;
        const uint8 *pass;
@@ -595,8 +780,8 @@ static NTSTATUS netr_creds_server_step_check(pipes_struct *p,
        struct tdb_context *tdb;
        bool schannel_global_required = (lp_server_schannel() == true) ? true:false;
        bool schannel_in_use = (p->auth.auth_type == PIPE_AUTH_TYPE_SCHANNEL) ? true:false; /* &&
-               (p->auth.auth_level == PIPE_AUTH_LEVEL_INTEGRITY ||
-                p->auth.auth_level == PIPE_AUTH_LEVEL_PRIVACY); */
+               (p->auth.auth_level == DCERPC_AUTH_LEVEL_INTEGRITY ||
+                p->auth.auth_level == DCERPC_AUTH_LEVEL_PRIVACY); */
 
        tdb = open_schannel_session_store(mem_ctx);
        if (!tdb) {
@@ -797,6 +982,7 @@ NTSTATUS _netr_ServerPasswordSet2(pipes_struct *p,
        struct samu *sampass;
        DATA_BLOB plaintext;
        struct samr_CryptPassword password_buf;
+       struct samr_Password nt_hash;
 
        become_root();
        status = netr_creds_server_step_check(p, p->mem_ctx,
@@ -822,6 +1008,8 @@ NTSTATUS _netr_ServerPasswordSet2(pipes_struct *p,
                return NT_STATUS_WRONG_PASSWORD;
        }
 
+       mdfour(nt_hash.hash, plaintext.data, plaintext.length);
+
        status = netr_find_machine_account(p->mem_ctx,
                                           creds->account_name,
                                           &sampass);
@@ -831,8 +1019,8 @@ NTSTATUS _netr_ServerPasswordSet2(pipes_struct *p,
 
        status = netr_set_machine_account_password(sampass,
                                                   sampass,
-                                                  &plaintext,
                                                   NULL,
+                                                  &nt_hash,
                                                   NULL);
        TALLOC_FREE(sampass);
        return status;
@@ -909,6 +1097,12 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
                        return NT_STATUS_NO_MEMORY;
                }
                break;
+       case 6:
+               r->out.validation->sam6 = TALLOC_ZERO_P(p->mem_ctx, struct netr_SamInfo6);
+               if (!r->out.validation->sam6) {
+                       return NT_STATUS_NO_MEMORY;
+               }
+               break;
        default:
                DEBUG(0,("%s: bad validation_level value %d.\n",
                        fn, (int)r->in.validation_level));
@@ -917,6 +1111,9 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
 
        switch (r->in.logon_level) {
        case NetlogonInteractiveInformation:
+       case NetlogonServiceInformation:
+       case NetlogonInteractiveTransitiveInformation:
+       case NetlogonServiceTransitiveInformation:
                nt_username     = logon->password->identity_info.account_name.string;
                nt_domain       = logon->password->identity_info.domain_name.string;
                nt_workstation  = logon->password->identity_info.workstation.string;
@@ -924,6 +1121,7 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
                DEBUG(3,("SAM Logon (Interactive). Domain:[%s].  ", lp_workgroup()));
                break;
        case NetlogonNetworkInformation:
+       case NetlogonNetworkTransitiveInformation:
                nt_username     = logon->network->identity_info.account_name.string;
                nt_domain       = logon->network->identity_info.domain_name.string;
                nt_workstation  = logon->network->identity_info.workstation.string;
@@ -946,6 +1144,7 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
 
        switch (r->in.logon_level) {
        case NetlogonNetworkInformation:
+       case NetlogonNetworkTransitiveInformation:
        {
                const char *wksname = nt_workstation;
 
@@ -975,6 +1174,10 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
                break;
        }
        case NetlogonInteractiveInformation:
+       case NetlogonServiceInformation:
+       case NetlogonInteractiveTransitiveInformation:
+       case NetlogonServiceTransitiveInformation:
+
                /* 'Interactive' authentication, supplies the password in its
                   MD4 form, encrypted with the session key.  We will convert
                   this to challenge/response for the auth subsystem to chew
@@ -1053,7 +1256,7 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
                    || (p->auth.a_u.schannel_auth == NULL)) {
                        return NT_STATUS_INVALID_HANDLE;
                }
-               memcpy(pipe_session_key, p->auth.a_u.schannel_auth->sess_key, 16);
+               memcpy(pipe_session_key, p->auth.a_u.schannel_auth->creds->session_key, 16);
        }
 
        switch (r->in.validation_level) {
@@ -1065,6 +1268,10 @@ static NTSTATUS _netr_LogonSamLogon_base(pipes_struct *p,
                status = serverinfo_to_SamInfo3(server_info, pipe_session_key, 16,
                                                r->out.validation->sam3);
                break;
+       case 6:
+               status = serverinfo_to_SamInfo6(server_info, pipe_session_key, 16,
+                                               r->out.validation->sam6);
+               break;
        }
 
        TALLOC_FREE(server_info);
@@ -1255,21 +1462,132 @@ NTSTATUS _netr_AccountSync(pipes_struct *p,
 /****************************************************************
 ****************************************************************/
 
+static bool wb_getdcname(TALLOC_CTX *mem_ctx,
+                        const char *domain,
+                        const char **dcname,
+                        uint32_t flags,
+                        WERROR *werr)
+{
+       wbcErr result;
+       struct wbcDomainControllerInfo *dc_info = NULL;
+
+       result = wbcLookupDomainController(domain,
+                                          flags,
+                                          &dc_info);
+       switch (result) {
+       case WBC_ERR_SUCCESS:
+               break;
+       case WBC_ERR_WINBIND_NOT_AVAILABLE:
+               return false;
+       case WBC_ERR_DOMAIN_NOT_FOUND:
+               *werr = WERR_NO_SUCH_DOMAIN;
+               return true;
+       default:
+               *werr = WERR_DOMAIN_CONTROLLER_NOT_FOUND;
+               return true;
+       }
+
+       *dcname = talloc_strdup(mem_ctx, dc_info->dc_name);
+       wbcFreeMemory(dc_info);
+       if (!*dcname) {
+               *werr = WERR_NOMEM;
+               return false;
+       }
+
+       *werr = WERR_OK;
+
+       return true;
+}
+
+/****************************************************************
+ _netr_GetDcName
+****************************************************************/
+
 WERROR _netr_GetDcName(pipes_struct *p,
                       struct netr_GetDcName *r)
 {
-       p->rng_fault_state = true;
-       return WERR_NOT_SUPPORTED;
+       NTSTATUS status;
+       WERROR werr;
+       uint32_t flags;
+       struct netr_DsRGetDCNameInfo *info;
+       bool ret;
+
+       ret = wb_getdcname(p->mem_ctx,
+                          r->in.domainname,
+                          r->out.dcname,
+                          WBC_LOOKUP_DC_IS_FLAT_NAME |
+                          WBC_LOOKUP_DC_RETURN_FLAT_NAME |
+                          WBC_LOOKUP_DC_PDC_REQUIRED,
+                          &werr);
+       if (ret == true) {
+               return werr;
+       }
+
+       flags = DS_PDC_REQUIRED | DS_IS_FLAT_NAME | DS_RETURN_FLAT_NAME;
+
+       status = dsgetdcname(p->mem_ctx,
+                            smbd_messaging_context(),
+                            r->in.domainname,
+                            NULL,
+                            NULL,
+                            flags,
+                            &info);
+       if (!NT_STATUS_IS_OK(status)) {
+               return ntstatus_to_werror(status);
+       }
+
+       *r->out.dcname = talloc_strdup(p->mem_ctx, info->dc_unc);
+       talloc_free(info);
+       if (!*r->out.dcname) {
+               return WERR_NOMEM;
+       }
+
+       return WERR_OK;
 }
 
 /****************************************************************
+ _netr_GetAnyDCName
 ****************************************************************/
 
 WERROR _netr_GetAnyDCName(pipes_struct *p,
                          struct netr_GetAnyDCName *r)
 {
-       p->rng_fault_state = true;
-       return WERR_NOT_SUPPORTED;
+       NTSTATUS status;
+       WERROR werr;
+       uint32_t flags;
+       struct netr_DsRGetDCNameInfo *info;
+       bool ret;
+
+       ret = wb_getdcname(p->mem_ctx,
+                          r->in.domainname,
+                          r->out.dcname,
+                          WBC_LOOKUP_DC_IS_FLAT_NAME |
+                          WBC_LOOKUP_DC_RETURN_FLAT_NAME,
+                          &werr);
+       if (ret == true) {
+               return werr;
+       }
+
+       flags = DS_IS_FLAT_NAME | DS_RETURN_FLAT_NAME;
+
+       status = dsgetdcname(p->mem_ctx,
+                            smbd_messaging_context(),
+                            r->in.domainname,
+                            NULL,
+                            NULL,
+                            flags,
+                            &info);
+       if (!NT_STATUS_IS_OK(status)) {
+               return ntstatus_to_werror(status);
+       }
+
+       *r->out.dcname = talloc_strdup(p->mem_ctx, info->dc_unc);
+       talloc_free(info);
+       if (!*r->out.dcname) {
+               return WERR_NOMEM;
+       }
+
+       return WERR_OK;
 }
 
 /****************************************************************