first public release of samba4 code

(This used to be commit b0510b5428b3461aeb9bbe3cc95f62fc73e2b97f)

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;
+}