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authorJakub Hrozek <jhrozek@redhat.com>2012-09-13 19:02:05 +0200
committerJakub Hrozek <jhrozek@redhat.com>2012-09-13 19:02:05 +0200
commitbf9abef629707167d39fcc92ec9c18a6244b27b8 (patch)
treec36cbc24e61e9d541036dffccd26a094d0e5c11f /po/eu.po
parentebb1f28998c06984765e3e78d30911c1c3ec84e2 (diff)
downloadsssd-bf9abef629707167d39fcc92ec9c18a6244b27b8.tar.gz
sssd-bf9abef629707167d39fcc92ec9c18a6244b27b8.tar.xz
sssd-bf9abef629707167d39fcc92ec9c18a6244b27b8.zip
Updating the translations for the 1.9.0 RC1 releasesssd-1_9_0_rc1sssd-1_8_98
Diffstat (limited to 'po/eu.po')
-rw-r--r--po/eu.po20
1 files changed, 10 insertions, 10 deletions
diff --git a/po/eu.po b/po/eu.po
index 66d1ad7c8..66c94a8ce 100644
--- a/po/eu.po
+++ b/po/eu.po
@@ -8,7 +8,7 @@ msgid ""
msgstr ""
"Project-Id-Version: SSSD\n"
"Report-Msgid-Bugs-To: sssd-devel@lists.fedorahosted.org\n"
-"POT-Creation-Date: 2012-09-05 16:37+0200\n"
+"POT-Creation-Date: 2012-09-13 18:48+0200\n"
"PO-Revision-Date: 2012-08-01 21:07+0000\n"
"Last-Translator: jhrozek <jhrozek@redhat.com>\n"
"Language-Team: Basque (http://www.transifex.com/projects/p/fedora/language/"
@@ -997,42 +997,42 @@ msgstr ""
msgid "PAM stack to use"
msgstr ""
-#: src/monitor/monitor.c:2415
+#: src/monitor/monitor.c:2410
msgid "Become a daemon (default)"
msgstr ""
-#: src/monitor/monitor.c:2417
+#: src/monitor/monitor.c:2412
msgid "Run interactive (not a daemon)"
msgstr ""
-#: src/monitor/monitor.c:2419 src/tools/sss_debuglevel.c:77
+#: src/monitor/monitor.c:2414 src/tools/sss_debuglevel.c:77
msgid "Specify a non-default config file"
msgstr ""
-#: src/monitor/monitor.c:2421
+#: src/monitor/monitor.c:2416
msgid "Print version number and exit"
msgstr "Inprimatu bertsio zenbakia eta irten"
-#: src/providers/krb5/krb5_child.c:1853 src/providers/ldap/ldap_child.c:399
+#: src/providers/krb5/krb5_child.c:1866 src/providers/ldap/ldap_child.c:399
#: src/util/util.h:92
msgid "Debug level"
msgstr "Arazketa maila"
-#: src/providers/krb5/krb5_child.c:1855 src/providers/ldap/ldap_child.c:401
+#: src/providers/krb5/krb5_child.c:1868 src/providers/ldap/ldap_child.c:401
#: src/util/util.h:96
msgid "Add debug timestamps"
msgstr "Gehitu arazketako data-zigiluak"
-#: src/providers/krb5/krb5_child.c:1857 src/providers/ldap/ldap_child.c:403
+#: src/providers/krb5/krb5_child.c:1870 src/providers/ldap/ldap_child.c:403
#: src/util/util.h:98
msgid "Show timestamps with microseconds"
msgstr ""
-#: src/providers/krb5/krb5_child.c:1859 src/providers/ldap/ldap_child.c:405
+#: src/providers/krb5/krb5_child.c:1872 src/providers/ldap/ldap_child.c:405
msgid "An open file descriptor for the debug logs"
msgstr ""
-#: src/providers/data_provider_be.c:2298
+#: src/providers/data_provider_be.c:2364
msgid "Domain of the information provider (mandatory)"
msgstr ""
id='n295' href='#n295'>295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826
/*
   Unix SMB/CIFS implementation.
   Password and authentication handling
   Copyright (C) Andrew Tridgell 1992-1998
   Copyright (C) Jeremy Allison 2007.

   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"

/* users from session setup */
static char *session_userlist = NULL;
/* workgroup from session setup. */
static char *session_workgroup = NULL;

/* this holds info on user ids that are already validated for this VC */
static user_struct *validated_users;
static int next_vuid = VUID_OFFSET;
static int num_validated_vuids;

enum server_allocated_state { SERVER_ALLOCATED_REQUIRED_YES,
				SERVER_ALLOCATED_REQUIRED_NO,
				SERVER_ALLOCATED_REQUIRED_ANY};

static user_struct *get_valid_user_struct_internal(uint16 vuid,
			enum server_allocated_state server_allocated)
{
	user_struct *usp;
	int count=0;

	if (vuid == UID_FIELD_INVALID)
		return NULL;

	for (usp=validated_users;usp;usp=usp->next,count++) {
		if (vuid == usp->vuid) {
			switch (server_allocated) {
				case SERVER_ALLOCATED_REQUIRED_YES:
					if (usp->server_info == NULL) {
						continue;
					}
					break;
				case SERVER_ALLOCATED_REQUIRED_NO:
					if (usp->server_info != NULL) {
						continue;
					}
				case SERVER_ALLOCATED_REQUIRED_ANY:
					break;
			}
			if (count > 10) {
				DLIST_PROMOTE(validated_users, usp);
			}
			return usp;
		}
	}

	return NULL;
}

/****************************************************************************
 Check if a uid has been validated, and return an pointer to the user_struct
 if it has. NULL if not. vuid is biased by an offset. This allows us to
 tell random client vuid's (normally zero) from valid vuids.
****************************************************************************/

user_struct *get_valid_user_struct(uint16 vuid)
{
	return get_valid_user_struct_internal(vuid,
			SERVER_ALLOCATED_REQUIRED_YES);
}

bool is_partial_auth_vuid(uint16 vuid)
{
	if (vuid == UID_FIELD_INVALID) {
		return False;
	}
	return get_valid_user_struct_internal(vuid,
			SERVER_ALLOCATED_REQUIRED_NO) ? True : False;
}

/****************************************************************************
 Get the user struct of a partial NTLMSSP login
****************************************************************************/

user_struct *get_partial_auth_user_struct(uint16 vuid)
{
	return get_valid_user_struct_internal(vuid,
			SERVER_ALLOCATED_REQUIRED_NO);
}

/****************************************************************************
 Invalidate a uid.
****************************************************************************/

void invalidate_vuid(uint16 vuid)
{
	user_struct *vuser = NULL;

	if (vuid == UID_FIELD_INVALID) {
		return;
	}

	vuser = get_valid_user_struct_internal(vuid,
			SERVER_ALLOCATED_REQUIRED_ANY);
	if (vuser == NULL) {
		return;
	}

	session_yield(vuser);

	if (vuser->auth_ntlmssp_state) {
		auth_ntlmssp_end(&vuser->auth_ntlmssp_state);
	}

	DLIST_REMOVE(validated_users, vuser);

	/* clear the vuid from the 'cache' on each connection, and
	   from the vuid 'owner' of connections */
	conn_clear_vuid_caches(vuid);

	TALLOC_FREE(vuser);
	num_validated_vuids--;
}

/****************************************************************************
 Invalidate all vuid entries for this process.
****************************************************************************/

void invalidate_all_vuids(void)
{
	while (validated_users != NULL) {
		invalidate_vuid(validated_users->vuid);
	}
}

/****************************************************
 Create a new partial auth user struct.
*****************************************************/

int register_initial_vuid(void)
{
	user_struct *vuser;

	/* Paranoia check. */
	if(lp_security() == SEC_SHARE) {
		smb_panic("register_initial_vuid: "
			"Tried to register uid in security=share");
	}

	/* Limit allowed vuids to 16bits - VUID_OFFSET. */
	if (num_validated_vuids >= 0xFFFF-VUID_OFFSET) {
		return UID_FIELD_INVALID;
	}

	if((vuser = talloc_zero(NULL, user_struct)) == NULL) {
		DEBUG(0,("register_initial_vuid: "
				"Failed to talloc users struct!\n"));
		return UID_FIELD_INVALID;
	}

	/* Allocate a free vuid. Yes this is a linear search... */
	while( get_valid_user_struct_internal(next_vuid,
			SERVER_ALLOCATED_REQUIRED_ANY) != NULL ) {
		next_vuid++;
		/* Check for vuid wrap. */
		if (next_vuid == UID_FIELD_INVALID) {
			next_vuid = VUID_OFFSET;
		}
	}

	DEBUG(10,("register_initial_vuid: allocated vuid = %u\n",
		(unsigned int)next_vuid ));

	vuser->vuid = next_vuid;

	/*
	 * This happens in an unfinished NTLMSSP session setup. We
	 * need to allocate a vuid between the first and second calls
	 * to NTLMSSP.
	 */
	next_vuid++;
	num_validated_vuids++;

	DLIST_ADD(validated_users, vuser);
	return vuser->vuid;
}

static int register_homes_share(const char *username)
{
	int result;
	struct passwd *pwd;

	result = lp_servicenumber(username);
	if (result != -1) {
		DEBUG(3, ("Using static (or previously created) service for "
			  "user '%s'; path = '%s'\n", username,
			  lp_pathname(result)));
		return result;
	}

	pwd = getpwnam_alloc(talloc_tos(), username);

	if ((pwd == NULL) || (pwd->pw_dir[0] == '\0')) {
		DEBUG(3, ("No home directory defined for user '%s'\n",
			  username));
		TALLOC_FREE(pwd);
		return -1;
	}

	DEBUG(3, ("Adding homes service for user '%s' using home directory: "
		  "'%s'\n", username, pwd->pw_dir));

	result = add_home_service(username, username, pwd->pw_dir);

	TALLOC_FREE(pwd);
	return result;
}

/**
 *  register that a valid login has been performed, establish 'session'.
 *  @param server_info The token returned from the authentication process.
 *   (now 'owned' by register_existing_vuid)
 *
 *  @param session_key The User session key for the login session (now also
 *  'owned' by register_existing_vuid)
 *
 *  @param respose_blob The NT challenge-response, if available.  (May be
 *  freed after this call)
 *
 *  @param smb_name The untranslated name of the user
 *
 *  @return Newly allocated vuid, biased by an offset. (This allows us to
 *   tell random client vuid's (normally zero) from valid vuids.)
 *
 */

int register_existing_vuid(uint16 vuid,
			auth_serversupplied_info *server_info,
			DATA_BLOB response_blob,
			const char *smb_name)
{
	fstring tmp;
	user_struct *vuser;

	vuser = get_partial_auth_user_struct(vuid);
	if (!vuser) {
		goto fail;
	}

	/* Use this to keep tabs on all our info from the authentication */
	vuser->server_info = talloc_move(vuser, &server_info);

	/* This is a potentially untrusted username */
	alpha_strcpy(tmp, smb_name, ". _-$", sizeof(tmp));

	vuser->server_info->sanitized_username = talloc_strdup(
		vuser->server_info, tmp);

	DEBUG(10,("register_existing_vuid: (%u,%u) %s %s %s guest=%d\n",
		  (unsigned int)vuser->server_info->utok.uid,
		  (unsigned int)vuser->server_info->utok.gid,
		  vuser->server_info->unix_name,
		  vuser->server_info->sanitized_username,
		  pdb_get_domain(vuser->server_info->sam_account),
		  vuser->server_info->guest ));

	DEBUG(3, ("register_existing_vuid: User name: %s\t"
		  "Real name: %s\n", vuser->server_info->unix_name,
		  pdb_get_fullname(vuser->server_info->sam_account)));

	if (!vuser->server_info->ptok) {
		DEBUG(1, ("register_existing_vuid: server_info does not "
			"contain a user_token - cannot continue\n"));
		goto fail;
	}

	DEBUG(3,("register_existing_vuid: UNIX uid %d is UNIX user %s, "
		"and will be vuid %u\n", (int)vuser->server_info->utok.uid,
		 vuser->server_info->unix_name, vuser->vuid));

	next_vuid++;
	num_validated_vuids++;

	if (!session_claim(vuser)) {
		DEBUG(1, ("register_existing_vuid: Failed to claim session "
			"for vuid=%d\n",
			vuser->vuid));
		goto fail;
	}

	/* Register a home dir service for this user if
	(a) This is not a guest connection,
	(b) we have a home directory defined
	(c) there s not an existing static share by that name
	If a share exists by this name (autoloaded or not) reuse it . */

	vuser->homes_snum = -1;

	if (!vuser->server_info->guest) {
		vuser->homes_snum = register_homes_share(
			vuser->server_info->unix_name);
	}

	if (srv_is_signing_negotiated() && !vuser->server_info->guest &&
			!srv_signing_started()) {
		/* Try and turn on server signing on the first non-guest
		 * sessionsetup. */
		srv_set_signing(vuser->server_info->user_session_key, response_blob);
	}

	/* fill in the current_user_info struct */
	set_current_user_info(
		vuser->server_info->sanitized_username,
		vuser->server_info->unix_name,
		pdb_get_fullname(vuser->server_info->sam_account),
		pdb_get_domain(vuser->server_info->sam_account));

	return vuser->vuid;

  fail:

	if (vuser) {
		invalidate_vuid(vuid);
	}
	return UID_FIELD_INVALID;
}

/****************************************************************************
 Add a name to the session users list.
****************************************************************************/

void add_session_user(const char *user)
{
	struct passwd *pw;
	char *tmp;

	pw = Get_Pwnam_alloc(talloc_tos(), user);

	if (pw == NULL) {
		return;
	}

	if (session_userlist == NULL) {
		session_userlist = SMB_STRDUP(pw->pw_name);
		goto done;
	}

	if (in_list(pw->pw_name,session_userlist,False) ) {
		goto done;
	}

	if (strlen(session_userlist) > 128 * 1024) {
		DEBUG(3,("add_session_user: session userlist already "
			 "too large.\n"));
		goto done;
	}

	if (asprintf(&tmp, "%s %s", session_userlist, pw->pw_name) == -1) {
		DEBUG(3, ("asprintf failed\n"));
		goto done;
	}

	SAFE_FREE(session_userlist);
	session_userlist = tmp;
 done:
	TALLOC_FREE(pw);
}

/****************************************************************************
 In security=share mode we need to store the client workgroup, as that's
  what Vista uses for the NTLMv2 calculation.
****************************************************************************/

void add_session_workgroup(const char *workgroup)
{
	if (session_workgroup) {
		SAFE_FREE(session_workgroup);
	}
	session_workgroup = smb_xstrdup(workgroup);
}

/****************************************************************************
 In security=share mode we need to return the client workgroup, as that's
  what Vista uses for the NTLMv2 calculation.
****************************************************************************/

const char *get_session_workgroup(void)
{
	return session_workgroup;
}

/****************************************************************************
 Check if a user is in a netgroup user list. If at first we don't succeed,
 try lower case.
****************************************************************************/

bool user_in_netgroup(const char *user, const char *ngname)
{
#ifdef HAVE_NETGROUP
	static char *mydomain = NULL;
	fstring lowercase_user;

	if (mydomain == NULL)
		yp_get_default_domain(&mydomain);

	if(mydomain == NULL) {
		DEBUG(5,("Unable to get default yp domain, "
			"let's try without specifying it\n"));
	}

	DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
		user, mydomain?mydomain:"(ANY)", ngname));

	if (innetgr(ngname, NULL, user, mydomain)) {
		DEBUG(5,("user_in_netgroup: Found\n"));
		return (True);
	} else {

		/*
		 * Ok, innetgr is case sensitive. Try once more with lowercase
		 * just in case. Attempt to fix #703. JRA.
		 */

		fstrcpy(lowercase_user, user);
		strlower_m(lowercase_user);

		DEBUG(5,("looking for user %s of domain %s in netgroup %s\n",
			lowercase_user, mydomain?mydomain:"(ANY)", ngname));

		if (innetgr(ngname, NULL, lowercase_user, mydomain)) {
			DEBUG(5,("user_in_netgroup: Found\n"));
			return (True);
		}
	}
#endif /* HAVE_NETGROUP */
	return False;
}

/****************************************************************************
 Check if a user is in a user list - can check combinations of UNIX
 and netgroup lists.
****************************************************************************/

bool user_in_list(const char *user,const char **list)
{
	if (!list || !*list)
		return False;

	DEBUG(10,("user_in_list: checking user %s in list\n", user));

	while (*list) {

		DEBUG(10,("user_in_list: checking user |%s| against |%s|\n",
			  user, *list));

		/*
		 * Check raw username.
		 */
		if (strequal(user, *list))
			return(True);

		/*
		 * Now check to see if any combination
		 * of UNIX and netgroups has been specified.
		 */

		if(**list == '@') {
			/*
			 * Old behaviour. Check netgroup list
			 * followed by UNIX list.
			 */
			if(user_in_netgroup(user, *list +1))
				return True;
			if(user_in_group(user, *list +1))
				return True;
		} else if (**list == '+') {

			if((*(*list +1)) == '&') {
				/*
				 * Search UNIX list followed by netgroup.
				 */
				if(user_in_group(user, *list +2))
					return True;
				if(user_in_netgroup(user, *list +2))
					return True;

			} else {

				/*
				 * Just search UNIX list.
				 */

				if(user_in_group(user, *list +1))
					return True;
			}

		} else if (**list == '&') {

			if(*(*list +1) == '+') {
				/*
				 * Search netgroup list followed by UNIX list.
				 */
				if(user_in_netgroup(user, *list +2))
					return True;
				if(user_in_group(user, *list +2))
					return True;
			} else {
				/*
				 * Just search netgroup list.
				 */
				if(user_in_netgroup(user, *list +1))
					return True;
			}
		}

		list++;
	}
	return(False);
}

/****************************************************************************
 Check if a username is valid.
****************************************************************************/

static bool user_ok(const char *user, int snum)
{
	char **valid, **invalid;
	bool ret;

	valid = invalid = NULL;
	ret = True;

	if (lp_invalid_users(snum)) {
		invalid = str_list_copy(talloc_tos(), lp_invalid_users(snum));
		if (invalid &&
		    str_list_substitute(invalid, "%S", lp_servicename(snum))) {

			/* This is used in sec=share only, so no current user
			 * around to pass to str_list_sub_basic() */

			if ( invalid && str_list_sub_basic(invalid, "", "") ) {
				ret = !user_in_list(user,
						    (const char **)invalid);
			}
		}
	}
	TALLOC_FREE(invalid);

	if (ret && lp_valid_users(snum)) {
		valid = str_list_copy(talloc_tos(), lp_valid_users(snum));
		if ( valid &&
		     str_list_substitute(valid, "%S", lp_servicename(snum)) ) {

			/* This is used in sec=share only, so no current user
			 * around to pass to str_list_sub_basic() */

			if ( valid && str_list_sub_basic(valid, "", "") ) {
				ret = user_in_list(user, (const char **)valid);
			}
		}
	}
	TALLOC_FREE(valid);

	if (ret && lp_onlyuser(snum)) {
		char **user_list = str_list_make_v3(
			talloc_tos(), lp_username(snum), NULL);
		if (user_list &&
		    str_list_substitute(user_list, "%S",
					lp_servicename(snum))) {
			ret = user_in_list(user, (const char **)user_list);
		}
		TALLOC_FREE(user_list);
	}

	return(ret);
}

/****************************************************************************
 Validate a group username entry. Return the username or NULL.
****************************************************************************/

static char *validate_group(char *group, DATA_BLOB password,int snum)
{
#ifdef HAVE_NETGROUP
	{
		char *host, *user, *domain;
		setnetgrent(group);
		while (getnetgrent(&host, &user, &domain)) {
			if (user) {
				if (user_ok(user, snum) && 
				    password_ok(user,password)) {
					endnetgrent();
					return(user);
				}
			}
		}
		endnetgrent();
	}
#endif

#ifdef HAVE_GETGRENT
	{
		struct group *gptr;
		setgrent();
		while ((gptr = (struct group *)getgrent())) {
			if (strequal(gptr->gr_name,group))
				break;
		}

		/*
		 * As user_ok can recurse doing a getgrent(), we must
		 * copy the member list onto the heap before
		 * use. Bug pointed out by leon@eatworms.swmed.edu.
		 */

		if (gptr) {
			char *member_list = NULL;
			size_t list_len = 0;
			char *member;
			int i;

			for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
				list_len += strlen(gptr->gr_mem[i])+1;
			}
			list_len++;

			member_list = (char *)SMB_MALLOC(list_len);
			if (!member_list) {
				endgrent();
				return NULL;
			}

			*member_list = '\0';
			member = member_list;

			for(i = 0; gptr->gr_mem && gptr->gr_mem[i]; i++) {
				size_t member_len = strlen(gptr->gr_mem[i])+1;

				DEBUG(10,("validate_group: = gr_mem = "
					  "%s\n", gptr->gr_mem[i]));

				safe_strcpy(member, gptr->gr_mem[i],
					list_len - (member-member_list));
				member += member_len;
			}

			endgrent();

			member = member_list;
			while (*member) {
				if (user_ok(member,snum) &&
				    password_ok(member,password)) {
					char *name = talloc_strdup(talloc_tos(),
								member);
					SAFE_FREE(member_list);
					return name;
				}

				DEBUG(10,("validate_group = member = %s\n",
					  member));

				member += strlen(member) + 1;
			}

			SAFE_FREE(member_list);
		} else {
			endgrent();
			return NULL;
		}
	}
#endif
	return(NULL);
}

/****************************************************************************
 Check for authority to login to a service with a given username/password.
 Note this is *NOT* used when logging on using sessionsetup_and_X.
****************************************************************************/

bool authorise_login(int snum, fstring user, DATA_BLOB password,
		     bool *guest)
{
	bool ok = False;

#ifdef DEBUG_PASSWORD
	DEBUG(100,("authorise_login: checking authorisation on "
		   "user=%s pass=%s\n", user,password.data));
#endif

	*guest = False;

	/* there are several possibilities:
		1) login as the given user with given password
		2) login as a previously registered username with the given
		   password
		3) login as a session list username with the given password
		4) login as a previously validated user/password pair
		5) login as the "user =" user with given password
		6) login as the "user =" user with no password
		   (guest connection)
		7) login as guest user with no password

		if the service is guest_only then steps 1 to 5 are skipped
	*/

	/* now check the list of session users */
	if (!ok) {
		char *auser;
		char *user_list = NULL;
		char *saveptr;

		if ( session_userlist )
			user_list = SMB_STRDUP(session_userlist);
		else
			user_list = SMB_STRDUP("");

		if (!user_list)
			return(False);

		for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
		     !ok && auser;
		     auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
			fstring user2;
			fstrcpy(user2,auser);
			if (!user_ok(user2,snum))
				continue;

			if (password_ok(user2,password)) {
				ok = True;
				fstrcpy(user,user2);
				DEBUG(3,("authorise_login: ACCEPTED: session "
					 "list username (%s) and given "
					 "password ok\n", user));
			}
		}

		SAFE_FREE(user_list);
	}

	/* check the user= fields and the given password */
	if (!ok && lp_username(snum)) {
		TALLOC_CTX *ctx = talloc_tos();
		char *auser;
		char *user_list = talloc_strdup(ctx, lp_username(snum));
		char *saveptr;

		if (!user_list) {
			goto check_guest;
		}

		user_list = talloc_string_sub(ctx,
				user_list,
				"%S",
				lp_servicename(snum));

		if (!user_list) {
			goto check_guest;
		}

		for (auser = strtok_r(user_list, LIST_SEP, &saveptr);
		     auser && !ok;
		     auser = strtok_r(NULL, LIST_SEP, &saveptr)) {
			if (*auser == '@') {
				auser = validate_group(auser+1,password,snum);
				if (auser) {
					ok = True;
					fstrcpy(user,auser);
					DEBUG(3,("authorise_login: ACCEPTED: "
						 "group username and given "
						 "password ok (%s)\n", user));
				}
			} else {
				fstring user2;
				fstrcpy(user2,auser);
				if (user_ok(user2,snum) &&
				    password_ok(user2,password)) {
					ok = True;
					fstrcpy(user,user2);
					DEBUG(3,("authorise_login: ACCEPTED: "
						 "user list username and "
						 "given password ok (%s)\n",
						 user));
				}
			}
		}
	}

  check_guest:

	/* check for a normal guest connection */
	if (!ok && GUEST_OK(snum)) {
		struct passwd *guest_pw;
		fstring guestname;
		fstrcpy(guestname,lp_guestaccount());
		guest_pw = Get_Pwnam_alloc(talloc_tos(), guestname);
		if (guest_pw != NULL) {
			fstrcpy(user,guestname);
			ok = True;
			DEBUG(3,("authorise_login: ACCEPTED: guest account "
				 "and guest ok (%s)\n",	user));
		} else {
			DEBUG(0,("authorise_login: Invalid guest account "
				 "%s??\n",guestname));
		}
		TALLOC_FREE(guest_pw);
		*guest = True;
	}

	if (ok && !user_ok(user, snum)) {
		DEBUG(0,("authorise_login: rejected invalid user %s\n",user));
		ok = False;
	}

	return(ok);
}