/* Unix SMB/CIFS implementation. 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" #undef DBGC_CLASS #define DBGC_CLASS DBGC_AUTH BOOL global_machine_password_needs_changing = False; extern pstring global_myname; extern userdom_struct current_user_info; /** * Connect to a remote server for domain security authenticaion. * * @param cli the cli to return containing the active connection * @param server either a machine name or text IP address to * connect to. * @param trust_password the trust password to establish the * credentials with. * **/ static NTSTATUS connect_to_domain_password_server(struct cli_state **cli, const char *server, const char *setup_creds_as, uint16 sec_chan, const unsigned char *trust_passwd) { struct in_addr dest_ip; fstring remote_machine; NTSTATUS result; 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 NT_STATUS_UNSUCCESSFUL; } 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 NT_STATUS_UNSUCCESSFUL; } } else { fstrcpy(remote_machine, server); } standard_sub_basic(current_user_info.smb_name, remote_machine, sizeof(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)); return NT_STATUS_UNSUCCESSFUL; } if (ismyip(dest_ip)) { DEBUG(1,("connect_to_domain_password_server: Password server loop - not using password server %s\n", remote_machine)); return NT_STATUS_UNSUCCESSFUL; } /* TODO: Send a SAMLOGON request to determine whether this is a valid logonserver. We can avoid a 30-second timeout if the DC is down if the SAMLOGON request fails as it is only over UDP. */ /* we use a mutex to prevent two connections at once - when a Win2k PDC get two connections where one hasn't completed a session setup yet it will send a TCP reset to the first connection (tridge) */ /* * With NT4.x DC's *all* authentication must be serialized to avoid * ACCESS_DENIED errors if 2 auths are done from the same machine. JRA. */ if (!grab_server_mutex(server)) return NT_STATUS_UNSUCCESSFUL; /* Attempt connection */ result = cli_full_connection(cli, global_myname, server, &dest_ip, 0, "IPC$", "IPC", "", "", "", 0); if (!NT_STATUS_IS_OK(result)) { release_server_mutex(); return result; } /* * We now have an anonymous connection to IPC$ 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(*cli, 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(*cli))); cli_nt_session_close(*cli); cli_ulogoff(*cli); cli_shutdown(*cli); release_server_mutex(); return NT_STATUS_UNSUCCESSFUL; } snprintf((*cli)->mach_acct, sizeof((*cli)->mach_acct) - 1, "%s$", setup_creds_as); if (!(*cli)->mach_acct) { release_server_mutex(); return NT_STATUS_NO_MEMORY; } result = new_cli_nt_setup_creds(*cli, sec_chan, 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, nt_errstr(result))); cli_nt_session_close(*cli); cli_ulogoff(*cli); cli_shutdown(*cli); release_server_mutex(); return result; } /* We exit here with the mutex *locked*. JRA */ return NT_STATUS_OK; } /*********************************************************************** Utility function to attempt a connection to an IP address of a DC. ************************************************************************/ static NTSTATUS attempt_connect_to_dc(struct cli_state **cli, const char *domain, struct in_addr *ip, const char *setup_creds_as, uint16 sec_chan, const unsigned char *trust_passwd) { fstring dc_name; /* * Ignore addresses we have already tried. */ if (is_zero_ip(*ip)) return NT_STATUS_UNSUCCESSFUL; if (!lookup_dc_name(global_myname, domain, ip, dc_name)) return NT_STATUS_UNSUCCESSFUL; return connect_to_domain_password_server(cli, dc_name, setup_creds_as, sec_chan, trust_passwd); } /*********************************************************************** We have been asked to dynamcially determine the IP addresses of the PDC and BDC's for DOMAIN, and query them in turn. ************************************************************************/ static NTSTATUS find_connect_pdc(struct cli_state **cli, const char *domain, const char *setup_creds_as, uint16 sec_chan, unsigned char *trust_passwd, time_t last_change_time) { struct in_addr *ip_list = NULL; int count = 0; int i; NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL; 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, domain, &ip_list, &count)) return NT_STATUS_UNSUCCESSFUL; /* * 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(NT_STATUS_IS_OK(nt_status = attempt_connect_to_dc(cli, domain, &ip_list[i], setup_creds_as, sec_chan, trust_passwd))) break; zero_ip(&ip_list[i]); /* Tried and failed. */ } /* * Secondly try and contact a random PDC/BDC. */ if(!NT_STATUS_IS_OK(nt_status)) { i = (sys_random() % count); if (!is_zero_ip(ip_list[i])) { if (!NT_STATUS_IS_OK(nt_status = attempt_connect_to_dc(cli, domain, &ip_list[i], setup_creds_as, sec_chan, 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(!NT_STATUS_IS_OK(nt_status)) { /* * 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 (is_zero_ip(ip_list[i])) continue; if (NT_STATUS_IS_OK(nt_status = attempt_connect_to_dc(cli, domain, &ip_list[i], setup_creds_as, sec_chan, trust_passwd))) break; } } SAFE_FREE(ip_list); return nt_status; } /*********************************************************************** 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(TALLOC_CTX *mem_ctx, const auth_usersupplied_info *user_info, const char *domain, uchar chal[8], auth_serversupplied_info **server_info, char *server, char *setup_creds_as, uint16 sec_chan, unsigned char trust_passwd[16], time_t last_change_time) { fstring remote_machine; NET_USER_INFO_3 info3; struct cli_state *cli = NULL; NTSTATUS nt_status = NT_STATUS_UNSUCCESSFUL; /* * 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. */ while (!NT_STATUS_IS_OK(nt_status) && next_token(&server,remote_machine,LIST_SEP,sizeof(remote_machine))) { if(strequal(remote_machine, "*")) { nt_status = find_connect_pdc(&cli, domain, setup_creds_as, sec_chan, trust_passwd, last_change_time); } else { nt_status = connect_to_domain_password_server(&cli, remote_machine, setup_creds_as, sec_chan, trust_passwd); } } if (!NT_STATUS_IS_OK(nt_status)) { DEBUG(0,("domain_client_validate: Domain password server not available.\n")); return nt_status; } ZERO_STRUCT(info3); /* * If this call succeeds, we now have lots of info about the user * in the info3 structure. */ nt_status = cli_netlogon_sam_network_logon(cli, mem_ctx, user_info->smb_name.str, user_info->domain.str, user_info->wksta_name.str, chal, user_info->lm_resp, user_info->nt_resp, &info3); if (!NT_STATUS_IS_OK(nt_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, nt_errstr(nt_status))); } else { nt_status = make_server_info_info3(mem_ctx, user_info->internal_username.str, user_info->smb_name.str, domain, server_info, &info3); #if 0 /* The stuff doesn't work right yet */ SMB_ASSERT(sizeof((*server_info)->session_key) == sizeof(info3.user_sess_key)); memcpy((*server_info)->session_key, info3.user_sess_key, sizeof((*server_info)->session_key)/* 16 */); SamOEMhash((*server_info)->session_key, trust_passwd, sizeof((*server_info)->session_key)); #endif uni_group_cache_store_netlogon(mem_ctx, &info3); } #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))); nt_status = NT_STATUS_LOGON_FAILURE; } } #endif /* 0 */ /* 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); release_server_mutex(); return nt_status; } /**************************************************************************** Check for a valid username and password in security=domain mode. ****************************************************************************/ static NTSTATUS check_ntdomain_security(const struct auth_context *auth_context, void *my_private_data, TALLOC_CTX *mem_ctx, const auth_usersupplied_info *user_info, auth_serversupplied_info **server_info) { NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE; char *password_server; unsigned char trust_passwd[16]; time_t last_change_time; char *domain = lp_workgroup(); if (!user_info || !server_info || !auth_context) { DEBUG(1,("check_ntdomain_security: Critical variables not present. Failing.\n")); return NT_STATUS_INVALID_PARAMETER; } /* * 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; } /* * Get the machine account password for our primary domain * No need to become_root() as secrets_init() is done at startup. */ if (!secrets_fetch_trust_account_password(domain, trust_passwd, &last_change_time)) { DEBUG(0, ("check_ntdomain_security: could not fetch trust account password for domain %s\n", lp_workgroup())); return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; } /* 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. */ password_server = lp_passwordserver(); nt_status = domain_client_validate(mem_ctx, user_info, domain, (uchar *)auth_context->challenge.data, server_info, password_server, global_myname, SEC_CHAN_WKSTA, trust_passwd, last_change_time); return nt_status; } /* module initialisation */ NTSTATUS auth_init_ntdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method) { if (!make_auth_methods(auth_context, auth_method)) { return NT_STATUS_NO_MEMORY; } (*auth_method)->name = "ntdomain"; (*auth_method)->auth = check_ntdomain_security; return NT_STATUS_OK; } /**************************************************************************** Check for a valid username and password in a trusted domain ****************************************************************************/ static NTSTATUS check_trustdomain_security(const struct auth_context *auth_context, void *my_private_data, TALLOC_CTX *mem_ctx, const auth_usersupplied_info *user_info, auth_serversupplied_info **server_info) { NTSTATUS nt_status = NT_STATUS_LOGON_FAILURE; unsigned char trust_md4_password[16]; char *trust_password; time_t last_change_time; DOM_SID sid; if (!user_info || !server_info || !auth_context) { DEBUG(1,("check_trustdomain_security: Critical variables not present. Failing.\n")); return NT_STATUS_INVALID_PARAMETER; } /* * 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_trustdomain_security: Requested domain was for this machine.\n")); return NT_STATUS_LOGON_FAILURE; } /* * Check that the requested domain is not our own domain, * If it is, we should use our own local password file. */ if(strequal(lp_workgroup(), (user_info->domain.str))) { DEBUG(3,("check_trustdomain_security: Requested domain was for this domain.\n")); return NT_STATUS_LOGON_FAILURE; } /* * Get the trusted account password for the trusted domain * No need to become_root() as secrets_init() is done at startup. */ if (!secrets_fetch_trusted_domain_password(user_info->domain.str, &trust_password, &sid, &last_change_time)) { DEBUG(0, ("check_trustdomain_security: could not fetch trust account password for domain %s\n", user_info->domain.str)); return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; } #ifdef DEBUG_PASSWORD DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain.str, trust_password)); #endif E_md4hash((uchar *)trust_password, trust_md4_password); SAFE_FREE(trust_password); #if 0 /* 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; } #endif nt_status = domain_client_validate(mem_ctx, user_info, user_info->domain.str, (uchar *)auth_context->challenge.data, server_info, "*" /* Do a lookup */, lp_workgroup(), SEC_CHAN_DOMAIN, trust_md4_password, last_change_time); return nt_status; } /* module initialisation */ NTSTATUS auth_init_trustdomain(struct auth_context *auth_context, const char* param, auth_methods **auth_method) { if (!make_auth_methods(auth_context, auth_method)) { return NT_STATUS_NO_MEMORY; } (*auth_method)->name = "trustdomain"; (*auth_method)->auth = check_trustdomain_security; return NT_STATUS_OK; }