diff options
Diffstat (limited to 'source4/auth/auth_domain.c')
| -rw-r--r-- | source4/auth/auth_domain.c | 554 |
1 files changed, 554 insertions, 0 deletions
diff --git a/source4/auth/auth_domain.c b/source4/auth/auth_domain.c new file mode 100644 index 0000000000..ff759539da --- /dev/null +++ b/source4/auth/auth_domain.c @@ -0,0 +1,554 @@ +/* + 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 userdom_struct current_user_info; + + +/* + resolve the name of a DC in ways appropriate for an ADS domain mode + an ADS domain may not have Netbios enabled at all, so this is + quite different from the RPC case + Note that we ignore the 'server' parameter here. That has the effect of using + the 'ADS server' smb.conf parameter, which is what we really want anyway + */ +static NTSTATUS ads_resolve_dc(fstring remote_machine, + struct in_addr *dest_ip) +{ + ADS_STRUCT *ads; + ads = ads_init_simple(); + if (!ads) { + return NT_STATUS_NO_LOGON_SERVERS; + } + + DEBUG(4,("ads_resolve_dc: realm=%s\n", ads->config.realm)); + + ads->auth.flags |= ADS_AUTH_NO_BIND; + +#ifdef HAVE_ADS + /* a full ads_connect() is actually overkill, as we don't srictly need + to do the SASL auth in order to get the info we need, but libads + doesn't offer a better way right now */ + ads_connect(ads); +#endif + + fstrcpy(remote_machine, ads->config.ldap_server_name); + strupper(remote_machine); + *dest_ip = ads->ldap_ip; + ads_destroy(&ads); + + if (!*remote_machine || is_zero_ip(*dest_ip)) { + return NT_STATUS_NO_LOGON_SERVERS; + } + + DEBUG(4,("ads_resolve_dc: using server='%s' IP=%s\n", + remote_machine, inet_ntoa(*dest_ip))); + + return NT_STATUS_OK; +} + +/* + resolve the name of a DC in ways appropriate for RPC domain mode + this relies on the server supporting netbios and port 137 not being + firewalled + */ +static NTSTATUS rpc_resolve_dc(const char *server, + fstring remote_machine, + struct in_addr *dest_ip) +{ + if (is_ipaddress(server)) { + struct in_addr to_ip = *interpret_addr2(server); + + /* we need to know the machines netbios name - this is a lousy + way to find it, but until we have a RPC call that does this + it will have to do */ + if (!name_status_find("*", 0x20, 0x20, to_ip, remote_machine)) { + DEBUG(2, ("rpc_resolve_dc: Can't resolve name for IP %s\n", server)); + return NT_STATUS_NO_LOGON_SERVERS; + } + + *dest_ip = to_ip; + return NT_STATUS_OK; + } + + fstrcpy(remote_machine, server); + strupper(remote_machine); + if (!resolve_name(remote_machine, dest_ip, 0x20)) { + DEBUG(1,("rpc_resolve_dc: Can't resolve address for %s\n", + remote_machine)); + return NT_STATUS_NO_LOGON_SERVERS; + } + + DEBUG(4,("rpc_resolve_dc: using server='%s' IP=%s\n", + remote_machine, inet_ntoa(*dest_ip))); + + return NT_STATUS_OK; +} + +/** + * 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_passwd 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, + BOOL *retry) +{ + struct in_addr dest_ip; + fstring remote_machine; + NTSTATUS result; + uint32 neg_flags = 0x000001ff; + + *retry = False; + + if (lp_security() == SEC_ADS) + result = ads_resolve_dc(remote_machine, &dest_ip); + else + result = rpc_resolve_dc(server, remote_machine, &dest_ip); + + if (!NT_STATUS_IS_OK(result)) { + DEBUG(2,("connect_to_domain_password_server: unable to resolve DC: %s\n", + nt_errstr(result))); + return result; + } + + 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_NO_LOGON_SERVERS; + } + + /* 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. + */ + + *retry = True; + + if (!grab_server_mutex(server)) + return NT_STATUS_NO_LOGON_SERVERS; + + /* Attempt connection */ + result = cli_full_connection(cli, lp_netbios_name(), remote_machine, + &dest_ip, 0, "IPC$", "IPC", "", "", "",0, retry); + + if (!NT_STATUS_IS_OK(result)) { + release_server_mutex(); + return result; + } + + /* + * We now have an anonymous connection to IPC$ 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" <bjart.kvarme@usit.uio.no>. + */ + + if(cli_nt_session_open(*cli, PI_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_NO_LOGON_SERVERS; + } + + 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 = cli_nt_setup_creds(*cli, sec_chan, trust_passwd, &neg_flags, 2); + + if (!NT_STATUS_IS_OK(result)) { + DEBUG(0,("connect_to_domain_password_server: unable to setup the NETLOGON 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) +{ + NTSTATUS ret = NT_STATUS_UNSUCCESSFUL; + BOOL retry = True; + fstring dc_name; + int i; + + /* + * Ignore addresses we have already tried. + */ + + if (is_zero_ip(*ip)) + return NT_STATUS_NO_LOGON_SERVERS; + + if (!lookup_dc_name(lp_netbios_name(), domain, ip, dc_name)) + return NT_STATUS_NO_LOGON_SERVERS; + + for (i = 0; (!NT_STATUS_IS_OK(ret)) && retry && (i < 3); i++) + ret = connect_to_domain_password_server(cli, dc_name, setup_creds_as, + sec_chan, trust_passwd, &retry); + return ret; +} + +/*********************************************************************** + We have been asked to dynamically determine the IP addresses of + the PDC and BDC's for DOMAIN, and query them in turn. +************************************************************************/ +static NTSTATUS find_connect_dc(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 dc_ip; + fstring srv_name; + + if ( !rpc_find_dc(lp_workgroup(), srv_name, &dc_ip) ) { + DEBUG(0,("find_connect_dc: Failed to find an DCs for %s\n", lp_workgroup())); + return NT_STATUS_NO_LOGON_SERVERS; + } + + return attempt_connect_to_dc( cli, domain, &dc_ip, setup_creds_as, + sec_chan, trust_passwd ); +} + +/*********************************************************************** + 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 *server, const 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_NO_LOGON_SERVERS; + + /* + * 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(lp_security() != SEC_ADS && strequal(remote_machine, "*")) { + nt_status = find_connect_dc(&cli, domain, setup_creds_as, sec_chan, trust_passwd, last_change_time); + } else { + int i; + BOOL retry = True; + for (i = 0; !NT_STATUS_IS_OK(nt_status) && retry && (i < 3); i++) + nt_status = connect_to_domain_password_server(&cli, remote_machine, setup_creds_as, + sec_chan, trust_passwd, &retry); + } + } + + 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; + const 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_myname(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", domain)); + return NT_STATUS_CANT_ACCESS_DOMAIN_INFO; + } + + /* Test if machine password has expired and needs to be changed */ + if (lp_machine_password_timeout()) { + if (last_change_time > 0 && + 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, lp_netbios_name(), 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_myname(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(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; +} |