/release/src/router/samba3/source/auth/auth_domain.c
C | 474 lines | 280 code | 79 blank | 115 comment | 39 complexity | c74694427ec7763b2b172d8f85859867 MD5 | raw file
- /*
- 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
- 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 in_addr dc_ip,
- 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_ip, 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_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;
- 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 in_addr dc_ip)
- {
- NET_USER_INFO_3 info3;
- 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_ip,
- &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 );
- ZERO_STRUCT(info3);
- /*
- * 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->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)->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);
- return nt_status;
- }
- }
- }
- netsamlogon_cache_store( user_info->smb_name, &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 in_addr dc_ip;
- 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_ip) ) {
- 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_ip);
-
- 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 in_addr dc_ip;
- 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 (!secrets_fetch_trusted_domain_password(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_ip) ) {
- 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_ip);
- 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;
- }