/* 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 3 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, see <http://www.gnu.org/licenses/>. */ #include "includes.h" #undef DBGC_CLASS #define DBGC_CLASS DBGC_AUTH extern bool global_machine_password_needs_changing; /** * Connect to a remote server for (inter)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 setup_creds_as domain account to setup credentials as * @param sec_chan a switch value to distinguish between domain * member and interdomain authentication * @param trust_passwd the trust password to establish the * credentials with. * **/ static NTSTATUS connect_to_domain_password_server(struct cli_state **cli, const char *domain, const char *dc_name, struct sockaddr_storage *dc_ss, struct rpc_pipe_client **pipe_ret, bool *retry) { NTSTATUS result; struct rpc_pipe_client *netlogon_pipe = NULL; *cli = NULL; *pipe_ret = NULL; /* 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(dc_name)) { return NT_STATUS_NO_LOGON_SERVERS; } /* Attempt connection */ *retry = True; result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0, "IPC$", "IPC", "", "", "", 0, Undefined, retry); if (!NT_STATUS_IS_OK(result)) { /* map to something more useful */ if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) { result = NT_STATUS_NO_LOGON_SERVERS; } if (*cli) { cli_shutdown(*cli); *cli = NULL; } release_server_mutex(); return result; } /* * We now have an anonymous connection to IPC$ 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" <bjart.kvarme@usit.uio.no>. */ /* open the netlogon pipe. */ if (lp_client_schannel()) { /* We also setup the creds chain in the open_schannel call. */ netlogon_pipe = cli_rpc_pipe_open_schannel(*cli, PI_NETLOGON, PIPE_AUTH_LEVEL_PRIVACY, domain, &result); } else { netlogon_pipe = cli_rpc_pipe_open_noauth(*cli, PI_NETLOGON, &result); } if(!netlogon_pipe) { DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \ machine %s. Error was : %s.\n", dc_name, nt_errstr(result))); cli_shutdown(*cli); *cli = NULL; release_server_mutex(); return result; } if (!lp_client_schannel()) { /* We need to set up a creds chain on an unauthenticated netlogon pipe. */ uint32 neg_flags = NETLOGON_NEG_SELECT_AUTH2_FLAGS; uint32 sec_chan_type = 0; unsigned char machine_pwd[16]; const char *account_name; if (!get_trust_pw_hash(domain, machine_pwd, &account_name, &sec_chan_type)) { DEBUG(0, ("connect_to_domain_password_server: could not fetch " "trust account password for domain '%s'\n", domain)); cli_shutdown(*cli); *cli = NULL; release_server_mutex(); return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; } result = rpccli_netlogon_setup_creds(netlogon_pipe, dc_name, /* server name */ domain, /* domain */ global_myname(), /* client name */ account_name, /* machine account name */ machine_pwd, sec_chan_type, &neg_flags); if (!NT_STATUS_IS_OK(result)) { cli_shutdown(*cli); *cli = NULL; release_server_mutex(); return result; } } if(!netlogon_pipe) { DEBUG(0,("connect_to_domain_password_server: unable to open the domain client session to \ machine %s. Error was : %s.\n", dc_name, cli_errstr(*cli))); cli_shutdown(*cli); *cli = NULL; release_server_mutex(); return NT_STATUS_NO_LOGON_SERVERS; } /* We exit here with the mutex *locked*. JRA */ *pipe_ret = netlogon_pipe; return NT_STATUS_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(TALLOC_CTX *mem_ctx, const auth_usersupplied_info *user_info, const char *domain, uchar chal[8], auth_serversupplied_info **server_info, const char *dc_name, struct sockaddr_storage *dc_ss) { struct netr_SamInfo3 *info3 = NULL; struct cli_state *cli = NULL; struct rpc_pipe_client *netlogon_pipe = NULL; NTSTATUS nt_status = NT_STATUS_NO_LOGON_SERVERS; int i; bool retry = True; /* * 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. */ /* rety loop for robustness */ for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) { nt_status = connect_to_domain_password_server(&cli, domain, dc_name, dc_ss, &netlogon_pipe, &retry); } if ( !NT_STATUS_IS_OK(nt_status) ) { DEBUG(0,("domain_client_validate: Domain password server not available.\n")); if (NT_STATUS_EQUAL(nt_status, NT_STATUS_ACCESS_DENIED)) { return NT_STATUS_TRUSTED_RELATIONSHIP_FAILURE; } return nt_status; } /* store a successful connection */ saf_store( domain, cli->desthost ); /* * If this call succeeds, we now have lots of info about the user * in the info3 structure. */ nt_status = rpccli_netlogon_sam_network_logon(netlogon_pipe, mem_ctx, user_info->logon_parameters,/* flags such as 'allow workstation logon' */ dc_name, /* server name */ user_info->smb_name, /* user name logging on. */ user_info->client_domain, /* domain name */ user_info->wksta_name, /* workstation name */ chal, /* 8 byte challenge. */ user_info->lm_resp, /* lanman 24 byte response */ user_info->nt_resp, /* nt 24 byte response */ &info3); /* info3 out */ /* Let go as soon as possible so we avoid any potential deadlocks with winbind lookup up users or groups. */ release_server_mutex(); 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, user_info->domain, dc_name, nt_errstr(nt_status))); /* map to something more useful */ if (NT_STATUS_EQUAL(nt_status, NT_STATUS_UNSUCCESSFUL)) { nt_status = NT_STATUS_NO_LOGON_SERVERS; } } else { nt_status = make_server_info_info3(mem_ctx, user_info->smb_name, domain, server_info, info3); if (NT_STATUS_IS_OK(nt_status)) { if (user_info->was_mapped) { (*server_info)->was_mapped = user_info->was_mapped; } if ( ! (*server_info)->guest) { /* if a real user check pam account restrictions */ /* only really perfomed if "obey pam restriction" is true */ nt_status = smb_pam_accountcheck((*server_info)->unix_name); if ( !NT_STATUS_IS_OK(nt_status)) { DEBUG(1, ("PAM account restriction prevents user login\n")); cli_shutdown(cli); TALLOC_FREE(info3); return nt_status; } } } netsamlogon_cache_store(user_info->smb_name, info3); TALLOC_FREE(info3); } /* 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_shutdown(cli); 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; const char *domain = lp_workgroup(); fstring dc_name; struct sockaddr_storage dc_ss; if ( lp_server_role() != ROLE_DOMAIN_MEMBER ) { DEBUG(0,("check_ntdomain_security: Configuration error! Cannot use " "ntdomain auth method when not a member of a domain.\n")); return NT_STATUS_NOT_IMPLEMENTED; } 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(strequal(get_global_sam_name(), user_info->domain)) { DEBUG(3,("check_ntdomain_security: Requested domain was for this machine.\n")); return NT_STATUS_NOT_IMPLEMENTED; } /* we need our DC to send the net_sam_logon() request to */ if ( !get_dc_name(domain, NULL, dc_name, &dc_ss) ) { DEBUG(5,("check_ntdomain_security: unable to locate a DC for domain %s\n", user_info->domain)); return NT_STATUS_NO_LOGON_SERVERS; } nt_status = domain_client_validate(mem_ctx, user_info, domain, (uchar *)auth_context->challenge.data, server_info, dc_name, &dc_ss); return nt_status; } /* module initialisation */ static 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; fstring dc_name; struct sockaddr_storage dc_ss; 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 or domain name. */ if( strequal(get_global_sam_name(), user_info->domain)) { DEBUG(3,("check_trustdomain_security: Requested domain [%s] was for this machine.\n", user_info->domain)); return NT_STATUS_NOT_IMPLEMENTED; } /* No point is bothering if this is not a trusted domain. This return makes "map to guest = bad user" work again. The logic is that if we know nothing about the domain, that user is not known to us and does not exist */ if ( !is_trusted_domain( user_info->domain ) ) return NT_STATUS_NOT_IMPLEMENTED; /* * Get the trusted account password for the trusted domain * No need to become_root() as secrets_init() is done at startup. */ if (!pdb_get_trusteddom_pw(user_info->domain, &trust_password, &sid, &last_change_time)) { DEBUG(0, ("check_trustdomain_security: could not fetch trust " "account password for domain %s\n", user_info->domain)); return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; } #ifdef DEBUG_PASSWORD DEBUG(100, ("Trust password for domain %s is %s\n", user_info->domain, trust_password)); #endif E_md4hash(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 + (time_t)lp_machine_password_timeout()) { global_machine_password_needs_changing = True; } #endif /* use get_dc_name() for consistency even through we know that it will be a netbios name */ if ( !get_dc_name(user_info->domain, NULL, dc_name, &dc_ss) ) { DEBUG(5,("check_trustdomain_security: unable to locate a DC for domain %s\n", user_info->domain)); return NT_STATUS_NO_LOGON_SERVERS; } nt_status = domain_client_validate(mem_ctx, user_info, user_info->domain, (uchar *)auth_context->challenge.data, server_info, dc_name, &dc_ss); return nt_status; } /* module initialisation */ static 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; } NTSTATUS auth_domain_init(void) { smb_register_auth(AUTH_INTERFACE_VERSION, "trustdomain", auth_init_trustdomain); smb_register_auth(AUTH_INTERFACE_VERSION, "ntdomain", auth_init_ntdomain); return NT_STATUS_OK; }