/* Unix SMB/Netbios implementation. Version 3.0. Authenticate against a remote domain Copyright (C) Andrew Tridgell 1992-1998 Copyright (C) Andrew Bartlett 2001 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 the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "includes.h" BOOL global_machine_password_needs_changing = False; extern pstring global_myname; extern userdom_struct current_user_info; /*********************************************************************** Connect to a remote machine for domain security authentication given a name or IP address. ***********************************************************************/ static BOOL connect_to_domain_password_server(struct cli_state *pcli, char *server, unsigned char *trust_passwd) { struct in_addr dest_ip; fstring remote_machine; NTSTATUS result; if (cli_initialise(pcli) == NULL) { DEBUG(0,("connect_to_domain_password_server: unable to initialize client connection.\n")); return False; } if (is_ipaddress(server)) { struct in_addr to_ip; /* we shouldn't have 255.255.255.255 forthe IP address of a password server anyways */ if ((to_ip.s_addr=inet_addr(server)) == 0xFFFFFFFF) { DEBUG (0,("connect_to_domain_password_server: inet_addr(%s) returned 0xFFFFFFFF!\n", server)); return False; } if (!name_status_find("*", 0x20, 0x20, to_ip, remote_machine)) { DEBUG(0, ("connect_to_domain_password_server: Can't " "resolve name for IP %s\n", server)); return False; } } else { fstrcpy(remote_machine, server); } standard_sub_basic(current_user_info.smb_name, remote_machine); strupper(remote_machine); if(!resolve_name( remote_machine, &dest_ip, 0x20)) { DEBUG(1,("connect_to_domain_password_server: Can't resolve address for %s\n", remote_machine)); cli_shutdown(pcli); return False; } if (ismyip(dest_ip)) { DEBUG(1,("connect_to_domain_password_server: Password server loop - not using password server %s\n", remote_machine)); cli_shutdown(pcli); return False; } if (!cli_connect(pcli, remote_machine, &dest_ip)) { DEBUG(0,("connect_to_domain_password_server: unable to connect to SMB server on \ machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } if (!attempt_netbios_session_request(pcli, global_myname, remote_machine, &dest_ip)) { DEBUG(0,("connect_to_password_server: machine %s rejected the NetBIOS \ session request. Error was : %s.\n", remote_machine, cli_errstr(pcli) )); return False; } pcli->protocol = PROTOCOL_NT1; if (!cli_negprot(pcli)) { DEBUG(0,("connect_to_domain_password_server: machine %s rejected the negotiate protocol. \ Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } if (pcli->protocol != PROTOCOL_NT1) { DEBUG(0,("connect_to_domain_password_server: machine %s didn't negotiate NT protocol.\n", remote_machine)); cli_shutdown(pcli); return False; } /* * Do an anonymous session setup. */ if (!cli_session_setup(pcli, "", "", 0, "", 0, "")) { DEBUG(0,("connect_to_domain_password_server: machine %s rejected the session setup. \ Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } if (!(pcli->sec_mode & 1)) { DEBUG(1,("connect_to_domain_password_server: machine %s isn't in user level security mode\n", remote_machine)); cli_shutdown(pcli); return False; } if (!cli_send_tconX(pcli, "IPC$", "IPC", "", 1)) { DEBUG(0,("connect_to_domain_password_server: machine %s rejected the tconX on the IPC$ share. \ Error was : %s.\n", remote_machine, cli_errstr(pcli) )); cli_shutdown(pcli); return False; } /* * We now have an anonymous connection to IPC$ on the domain password server. */ /* * Even if the connect succeeds we need to setup the netlogon * pipe here. We do this as we may just have changed the domain * account password on the PDC and yet we may be talking to * a BDC that doesn't have this replicated yet. In this case * a successful connect to a DC needs to take the netlogon connect * into account also. This patch from "Bjart Kvarme" . */ if(cli_nt_session_open(pcli, PIPE_NETLOGON) == False) { DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \ machine %s. Error was : %s.\n", remote_machine, cli_errstr(pcli))); cli_nt_session_close(pcli); cli_ulogoff(pcli); cli_shutdown(pcli); return False; } result = cli_nt_setup_creds(pcli, trust_passwd); if (!NT_STATUS_IS_OK(result)) { DEBUG(0,("connect_to_domain_password_server: unable to setup the PDC credentials to machine \ %s. Error was : %s.\n", remote_machine, get_nt_error_msg(result))); cli_nt_session_close(pcli); cli_ulogoff(pcli); cli_shutdown(pcli); return(False); } return True; } /*********************************************************************** Utility function to attempt a connection to an IP address of a DC. ************************************************************************/ static BOOL attempt_connect_to_dc(struct cli_state *pcli, struct in_addr *ip, unsigned char *trust_passwd) { fstring dc_name; /* * Ignore addresses we have already tried. */ if (is_zero_ip(*ip)) return False; if (!lookup_dc_name(global_myname, lp_workgroup(), ip, dc_name)) return False; return connect_to_domain_password_server(pcli, dc_name, trust_passwd); } /*********************************************************************** We have been asked to dynamcially determine the IP addresses of the PDC and BDC's for this DOMAIN, and query them in turn. ************************************************************************/ static BOOL find_connect_pdc(struct cli_state *pcli, unsigned char *trust_passwd, time_t last_change_time) { struct in_addr *ip_list = NULL; int count = 0; int i; BOOL connected_ok = False; time_t time_now = time(NULL); BOOL use_pdc_only = False; /* * If the time the machine password has changed * was less than an hour ago then we need to contact * the PDC only, as we cannot be sure domain replication * has yet taken place. Bug found by Gerald (way to go * Gerald !). JRA. */ if (time_now - last_change_time < 3600) use_pdc_only = True; if (!get_dc_list(use_pdc_only, lp_workgroup(), &ip_list, &count)) return False; /* * Firstly try and contact a PDC/BDC who has the same * network address as any of our interfaces. */ for(i = 0; i < count; i++) { if(!is_local_net(ip_list[i])) continue; if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) break; zero_ip(&ip_list[i]); /* Tried and failed. */ } /* * Secondly try and contact a random PDC/BDC. */ if(!connected_ok) { i = (sys_random() % count); if (!(connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) zero_ip(&ip_list[i]); /* Tried and failed. */ } /* * Finally go through the IP list in turn, ignoring any addresses * we have already tried. */ if(!connected_ok) { /* * Try and connect to any of the other IP addresses in the PDC/BDC list. * Note that from a WINS server the #1 IP address is the PDC. */ for(i = 0; i < count; i++) { if((connected_ok = attempt_connect_to_dc(pcli, &ip_list[i], trust_passwd))) break; } } SAFE_FREE(ip_list); return connected_ok; } /*********************************************************************** Do the same as security=server, but using NT Domain calls and a session key from the machine password. If the server parameter is specified use it, otherwise figure out a server from the 'password server' param. ************************************************************************/ static NTSTATUS domain_client_validate(const auth_usersupplied_info *user_info, uchar chal[8], auth_serversupplied_info **server_info, char *server, unsigned char *trust_passwd, time_t last_change_time) { fstring remote_machine; NET_ID_INFO_CTR ctr; NET_USER_INFO_3 info3; struct cli_state cli; uint32 smb_uid_low; BOOL connected_ok = False; NTSTATUS status; struct passwd *pass; /* * At this point, smb_apasswd points to the lanman response to * the challenge in local_challenge, and smb_ntpasswd points to * the NT response to the challenge in local_challenge. Ship * these over the secure channel to a domain controller and * see if they were valid. */ ZERO_STRUCT(cli); while (!connected_ok && next_token(&server,remote_machine,LIST_SEP,sizeof(remote_machine))) { if(strequal(remote_machine, "*")) { connected_ok = find_connect_pdc(&cli, trust_passwd, last_change_time); } else { connected_ok = connect_to_domain_password_server(&cli, remote_machine, trust_passwd); } } if (!connected_ok) { DEBUG(0,("domain_client_validate: Domain password server not available.\n")); cli_shutdown(&cli); return NT_STATUS_LOGON_FAILURE; } /* We really don't care what LUID we give the user. */ generate_random_buffer( (unsigned char *)&smb_uid_low, 4, False); ZERO_STRUCT(info3); /* * If this call succeeds, we now have lots of info about the user * in the info3 structure. */ status = cli_nt_login_network(&cli, user_info, chal, smb_uid_low, &ctr, &info3); if (!NT_STATUS_IS_OK(status)) { DEBUG(0,("domain_client_validate: unable to validate password " "for user %s in domain %s to Domain controller %s. " "Error was %s.\n", user_info->smb_name.str, user_info->domain.str, cli.srv_name_slash, get_nt_error_msg(status))); } else { char *dom_user; /* Check DOMAIN\username first to catch winbind users, then just the username for local users. */ asprintf(&dom_user, "%s%s%s", user_info->domain.str, lp_winbind_separator(), user_info->internal_username.str); if (!(pass = Get_Pwnam(dom_user))) pass = Get_Pwnam(user_info->internal_username.str); free(dom_user); if (pass) { make_server_info_pw(server_info, pass); if (!server_info) { status = NT_STATUS_NO_MEMORY; } } else { status = NT_STATUS_NO_SUCH_USER; } } /* Store the user group information in the server_info returned to the caller. */ if (NT_STATUS_IS_OK(status) && (info3.num_groups2 != 0)) { DOM_SID domain_sid; int i; NT_USER_TOKEN *ptok; auth_serversupplied_info *pserver_info = *server_info; if ((pserver_info->ptok = malloc( sizeof(NT_USER_TOKEN) ) ) == NULL) { DEBUG(0, ("domain_client_validate: out of memory allocating rid group membership\n")); status = NT_STATUS_NO_MEMORY; free_server_info(server_info); goto done; } ptok = pserver_info->ptok; ptok->num_sids = (size_t)info3.num_groups2; if ((ptok->user_sids = (DOM_SID *)malloc( sizeof(DOM_SID) * ptok->num_sids )) == NULL) { DEBUG(0, ("domain_client_validate: Out of memory allocating group SIDS\n")); status = NT_STATUS_NO_MEMORY; free_server_info(server_info); goto done; } if (!secrets_fetch_domain_sid(lp_workgroup(), &domain_sid)) { DEBUG(0, ("domain_client_validate: unable to fetch domain sid.\n")); status = NT_STATUS_CANT_ACCESS_DOMAIN_INFO; free_server_info(server_info); goto done; } for (i = 0; i < ptok->num_sids; i++) { sid_copy(&ptok->user_sids[i], &domain_sid); sid_append_rid(&ptok->user_sids[i], info3.gids[i].g_rid); } } #if 0 /* * We don't actually need to do this - plus it fails currently with * NT_STATUS_INVALID_INFO_CLASS - we need to know *exactly* what to * send here. JRA. */ if (NT_STATUS_IS_OK(status)) { if(cli_nt_logoff(&cli, &ctr) == False) { DEBUG(0,("domain_client_validate: unable to log off user %s in domain \ %s to Domain controller %s. Error was %s.\n", user, domain, remote_machine, cli_errstr(&cli))); status = NT_STATUS_LOGON_FAILURE; } } #endif /* 0 */ done: /* Note - once the cli stream is shutdown the mem_ctx used to allocate the other_sids and gids structures has been deleted - so these pointers are no longer valid..... */ cli_nt_session_close(&cli); cli_ulogoff(&cli); cli_shutdown(&cli); return status; } /**************************************************************************** Check for a valid username and password in security=domain mode. ****************************************************************************/ static NTSTATUS check_ntdomain_security(void *my_private_data, const auth_usersupplied_info *user_info, const auth_authsupplied_info *auth_info, auth_serversupplied_info **server_info) { NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE; char *p, *pserver; unsigned char trust_passwd[16]; time_t last_change_time; if (!user_info || !server_info || !auth_info) { DEBUG(1,("check_ntdomain_security: Critical variables not present. Failing.\n")); return NT_STATUS_LOGON_FAILURE; } /* * Check that the requested domain is not our own machine name. * If it is, we should never check the PDC here, we use our own local * password file. */ if(is_netbios_alias_or_name(user_info->domain.str)) { DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n")); return NT_STATUS_LOGON_FAILURE; } become_root(); /* * Get the machine account password for our primary domain */ if (!secrets_fetch_trust_account_password(lp_workgroup(), trust_passwd, &last_change_time)) { DEBUG(0, ("check_domain_security: could not fetch trust account password for domain %s\n", lp_workgroup())); unbecome_root(); return NT_STATUS_LOGON_FAILURE; } unbecome_root(); /* Test if machine password is expired and need to be changed */ if (time(NULL) > last_change_time + lp_machine_password_timeout()) { global_machine_password_needs_changing = True; } /* * Treat each name in the 'password server =' line as a potential * PDC/BDC. Contact each in turn and try and authenticate. */ pserver = lp_passwordserver(); if (! *pserver) pserver = "*"; p = pserver; nt_status = domain_client_validate(user_info, (uchar *)auth_info->challenge.data,server_info, p, trust_passwd, last_change_time); return nt_status; } BOOL auth_init_ntdomain(auth_methods **auth_method) { if (!make_auth_methods(auth_method)) { return False; } (*auth_method)->auth = check_ntdomain_security; return True; }