diff options
Diffstat (limited to 'source3/auth/auth_domain.c')
-rw-r--r-- | source3/auth/auth_domain.c | 477 |
1 files changed, 477 insertions, 0 deletions
diff --git a/source3/auth/auth_domain.c b/source3/auth/auth_domain.c new file mode 100644 index 0000000000..c25e62ab80 --- /dev/null +++ b/source3/auth/auth_domain.c @@ -0,0 +1,477 @@ +/* + 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; +static struct named_mutex *mutex; + +/** + * 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. + */ + + mutex = grab_named_mutex(NULL, dc_name, 10); + if (mutex == NULL) { + return NT_STATUS_NO_LOGON_SERVERS; + } + + /* Attempt connection */ + *retry = True; + result = cli_full_connection(cli, global_myname(), dc_name, dc_ss, 0, + "IPC$", "IPC", "", "", "", 0, Undefined, retry); + + if (!NT_STATUS_IS_OK(result)) { + /* map to something more useful */ + if (NT_STATUS_EQUAL(result, NT_STATUS_UNSUCCESSFUL)) { + result = NT_STATUS_NO_LOGON_SERVERS; + } + + if (*cli) { + cli_shutdown(*cli); + *cli = NULL; + } + + TALLOC_FREE(mutex); + return result; + } + + /* + * We now have an anonymous connection to IPC$ 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. */ + result = cli_rpc_pipe_open_schannel( + *cli, &ndr_table_netlogon.syntax_id, + PIPE_AUTH_LEVEL_PRIVACY, domain, &netlogon_pipe); + } else { + result = cli_rpc_pipe_open_noauth( + *cli, &ndr_table_netlogon.syntax_id, &netlogon_pipe); + } + + if (!NT_STATUS_IS_OK(result)) { + 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; + TALLOC_FREE(mutex); + return result; + } + + if (!lp_client_schannel()) { + /* We need to set up a creds chain on an unauthenticated netlogon pipe. */ + uint32_t neg_flags = NETLOGON_NEG_AUTH2_ADS_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; + TALLOC_FREE(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; + TALLOC_FREE(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; + TALLOC_FREE(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. */ + + TALLOC_FREE(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->client_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)) { + (*server_info)->nss_token |= 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; +} |