tbauth.php3 22.1 KB
Newer Older
1 2
<?php
#
Leigh B. Stoller's avatar
Leigh B. Stoller committed
3
# EMULAB-COPYRIGHT
4
# Copyright (c) 2000-2003 University of Utah and the Flux Group.
Leigh B. Stoller's avatar
Leigh B. Stoller committed
5 6 7
# All rights reserved.
#
#
8
# Login support: Beware empty spaces (cookies)!
9 10
#

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41
# These global are to prevent repeated calls to the DB. 
#
$CHECKLOGIN_STATUS		= -1;
$CHECKLOGIN_UID			= 0;
$CHECKLOGIN_NOLOGINS		= -1;

#
# New Mapping. 
#
define("CHECKLOGIN_NOSTATUS",		-1);
define("CHECKLOGIN_NOTLOGGEDIN",	0);
define("CHECKLOGIN_LOGGEDIN",		1);
define("CHECKLOGIN_TIMEDOUT",		2);
define("CHECKLOGIN_MAYBEVALID",		4);
define("CHECKLOGIN_STATUSMASK",		0x000ff);
define("CHECKLOGIN_MODMASK",		0xfff00);
#
# These are modifiers of the above status fields. They are stored
# as a bit field in the top part. This is intended to localize as
# many queries related to login as possible. 
#
define("CHECKLOGIN_NEWUSER",		0x00100);
define("CHECKLOGIN_UNVERIFIED",		0x00200);
define("CHECKLOGIN_UNAPPROVED",		0x00400);
define("CHECKLOGIN_ACTIVE",		0x00800);
define("CHECKLOGIN_USERSTATUS",		0x00f00);
define("CHECKLOGIN_PSWDEXPIRED",	0x01000);
define("CHECKLOGIN_FROZEN",		0x02000);
define("CHECKLOGIN_ISADMIN",		0x04000);
define("CHECKLOGIN_TRUSTED",		0x08000);
define("CHECKLOGIN_CVSWEB",		0x10000);
42
define("CHECKLOGIN_ADMINOFF",		0x20000);
43
define("CHECKLOGIN_WEBONLY",		0x40000);
44

45 46 47
#
# Constants for tracking possible login attacks.
#
48 49
define("DOLOGIN_MAXUSERATTEMPTS",	8);
define("DOLOGIN_MAXUSERWAITTIME",	100);	# Seconds
50 51 52
define("DOLOGIN_MAXIPATTEMPTS",		8);
define("DOLOGIN_MAXIPWAITTIME",		120);	# Seconds

53 54 55 56 57 58 59 60 61
#
# Generate a hash value suitable for authorization. We use the results of
# microtime, combined with a random number.
# 
function GENHASH() {
    $fp = fopen("/dev/urandom", "r");
    if (! $fp) {
        TBERROR("Error opening /dev/urandom", 1);
    }
Leigh B. Stoller's avatar
Leigh B. Stoller committed
62
    $random_bytes = fread($fp, 128);
63 64 65 66 67 68
    fclose($fp);

    $hash  = mhash (MHASH_MD5, bin2hex($retval) . " " . microtime());
    return bin2hex($hash);
}

69 70 71
#
# Return the value of the currently logged in uid, or null if not
# logged in. Basically, check the browser to see if its sending a UID
72
# and HASH back, and then check the DB to see if the user is really
73 74 75 76 77 78
# logged in.
# 
function GETLOGIN() {
    if (($uid = GETUID()) == FALSE)
	    return FALSE;

79 80
    $check = CHECKLOGIN($uid);

81
    if ($check & (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_MAYBEVALID))
82 83 84 85 86 87 88 89 90 91 92
	    return $uid;

    return FALSE;
}

#
# Return the value of the UID cookie. This does not check to see if
# this person is currently logged in. We just want to know what the
# browser thinks, if anything.
# 
function GETUID() {
Leigh B. Stoller's avatar
Leigh B. Stoller committed
93
    global $TBNAMECOOKIE;
Chad Barb's avatar
 
Chad Barb committed
94
    global $nocookieuid;
95

Leigh B. Stoller's avatar
Leigh B. Stoller committed
96
    $curname = FALSE;
Chad Barb's avatar
 
Chad Barb committed
97

Leigh B. Stoller's avatar
Leigh B. Stoller committed
98 99 100
    # XXX - nocookieuid is sent by netbuild applet in URL.
    if (isset($_GET['nocookieuid'])) {
	$curname = $_GET['nocookieuid'];
Chad Barb's avatar
 
Chad Barb committed
101
    }
Leigh B. Stoller's avatar
Leigh B. Stoller committed
102 103 104 105 106
    elseif (isset($_COOKIE[$TBNAMECOOKIE])) {
	$curname = $_COOKIE[$TBNAMECOOKIE];
    }
    else
	return FALSE;
Chad Barb's avatar
 
Chad Barb committed
107

Leigh B. Stoller's avatar
Leigh B. Stoller committed
108
    # Verify valid string (no special chars like single/double quotes!).
Leigh B. Stoller's avatar
Leigh B. Stoller committed
109 110 111 112
    # We do not use the standard check function here, since we want to
    # avoid a DB access on each page until its required. Thats okay since
    # since we just need to ensure that we feed to the DB query is safe.
    if (! preg_match("/^[-\w]+$/", $curname)) {
Chad Barb's avatar
 
Chad Barb committed
113 114
	return FALSE;
    }
115 116 117
    return $curname;
}

118
#
119
# Verify a login by sucking a UIDs current hash value out of the database.
120 121 122
# If the login has expired, or of the hashkey in the database does not
# match what came back in the cookie, then the UID is no longer logged in.
#
123
# Returns a combination of the CHECKLOGIN values above.
124
#
125
function CHECKLOGIN($uid) {
126
    global $TBAUTHCOOKIE, $TBLOGINCOOKIE, $HTTP_COOKIE_VARS, $TBAUTHTIMEOUT;
Leigh B. Stoller's avatar
Leigh B. Stoller committed
127
    global $CHECKLOGIN_STATUS, $CHECKLOGIN_UID;
Chad Barb's avatar
 
Chad Barb committed
128
    global $nocookieauth;
129 130 131 132 133 134 135
    #
    # If we already figured this out, do not duplicate work!
    #
    if ($CHECKLOGIN_STATUS != CHECKLOGIN_NOSTATUS) {
	return $CHECKLOGIN_STATUS;
    }
    $CHECKLOGIN_UID = $uid;
136

Chad Barb's avatar
 
Chad Barb committed
137 138 139 140 141 142 143 144
    # for java applet, we can send the key in the $auth variable,
    # rather than passing it is a cookie.
    if (isset($nocookieauth)) {
	$curhash = $nocookieauth;
    } else {
	$curhash = $HTTP_COOKIE_VARS[$TBAUTHCOOKIE];
    }
    
145 146 147 148
    #
    # Note that we get multiple rows back because of the group_membership
    # join. No big deal.
    # 
149
    $query_result =
150
	DBQueryFatal("select NOW()>=u.pswd_expires,l.hashkey,l.timeout, ".
151
		     "       status,admin,cvsweb,g.trust,adminoff,webonly " .
152 153
		     " from users as u ".
		     "left join login as l on l.uid=u.uid ".
154
		     "left join group_membership as g on g.uid=u.uid ".
155
		     "where u.uid='$uid'");
156

157
    # No such user.
158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179
    if (! mysql_num_rows($query_result)) { 
	$CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	return $CHECKLOGIN_STATUS;
    }
    
    #
    # Scan the rows. All the info is duplicate, except for the trust
    # values. 
    #
    $trusted = 0;
    while ($row = mysql_fetch_array($query_result)) {
	$expired = $row[0];
	$hashkey = $row[1];
	$timeout = $row[2];
	$status  = $row[3];
	$admin   = $row[4];
	$cvsweb  = $row[5];

	if (! strcmp($row[6], "project_root") ||
	    ! strcmp($row[6], "group_root")) {
	    $trusted = 1;
	}
180 181
	$adminoff = $row[7];
	$webonly  = $row[8];
182
    }
183 184 185 186

    #
    # If user exists, but login has no entry, quit now.
    #
187 188 189 190
    if (!$hashkey) {
	$CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	return $CHECKLOGIN_STATUS;
    }
191

192
    #
193
    # Check for frozen account. Might do something interesting later.
194
    #
195
    if (! strcmp($status, TBDB_USERSTATUS_FROZEN)) {
196
	DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
197 198
	$CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	return $CHECKLOGIN_STATUS;
199 200
    }

201
    #
202 203
    # Check for expired login. It does not matter if the cookie matches,
    # kill the entry anyway so the user is officially logged out.
204
    #
205
    if (time() > $timeout) {
206 207 208 209 210 211
	DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
	$CHECKLOGIN_STATUS = CHECKLOGIN_TIMEDOUT;
	return $CHECKLOGIN_STATUS;
    }

    #
212 213 214 215 216 217 218 219 220 221 222 223 224 225 226
    # We know the login has not expired. The problem is that we might not
    # have received a cookie since that is set to transfer only when using
    # https. However, we do not want the menu to be flipping back and forth
    # each time the user uses http (say, for documentation), and so the lack
    # of a cookie does not provide enough info to determine if the user is
    # logged in or not from the current browser. Also, we want to allow for
    # a user to switch browsers, and not get confused by getting a uid but
    # no valid cookie from the new browser. In that case the user should just
    # be able to login from the new browser; gets a standard not-logged-in
    # front page. In order to accomplish this, we need another cookie that is
    # set on login, cleared on logout.
    #
    if (isset($curhash)) {
	#
	# Got a cookie (https).
227
	#
228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
	if ($curhash != $hashkey) {
	    #
	    # User is not logged in from this browser. Must be stale.
	    # 
	    $CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	    return $CHECKLOGIN_STATUS;
	}
	else {
            #
	    # User is logged in. Update the time in the database.
	    # Basically, each time the user does something, we bump the
	    # logout further into the future. This avoids timing them
	    # out just when they are doing useful work.
            #
	    $timeout = time() + $TBAUTHTIMEOUT;
243 244 245 246

	    DBQueryFatal("UPDATE login set timeout='$timeout' ".
			 "WHERE uid='$uid'");

247 248
	    $CHECKLOGIN_STATUS = CHECKLOGIN_LOGGEDIN;
	}
249 250
    }
    else {
251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273
	#
	# No cookie. Might be because its http, so there is no way to tell
	# if user is not logged in from the current browser without more
	# information. We use another cookie for this, which is a crc of
	# of the real hash, and simply tells us what menu to draw, but does
	# not impart any privs!
	#
	$hashhash = $HTTP_COOKIE_VARS[$TBLOGINCOOKIE];
	
	if (isset($hashhash) &&
	    $hashhash == bin2hex(mhash(MHASH_CRC32, $hashkey))) {
            #
            # The login is probably valid, but we have no proof yet. 
            #
	    $CHECKLOGIN_STATUS = CHECKLOGIN_MAYBEVALID;
	}
	else {
	    #
	    # No hash of the hash, so assume no real cookie either. 
	    # 
	    $CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	    return $CHECKLOGIN_STATUS;
	}
274 275 276
    }

    #
277
    # Now add in the modifiers.
278
    #
279 280 281 282
    if ($expired)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_PSWDEXPIRED;
    if ($admin)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ISADMIN;
283 284
    if ($adminoff)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ADMINOFF;
285 286
    if ($webonly)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_WEBONLY;
287 288 289 290 291 292 293 294 295 296 297 298 299
    if ($trusted)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_TRUSTED;
    if ($cvsweb)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_CVSWEB;
    if (strcmp($status, TBDB_USERSTATUS_NEWUSER) == 0)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_NEWUSER;
    if (strcmp($status, TBDB_USERSTATUS_UNAPPROVED) == 0)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_UNAPPROVED;
    if (strcmp($status, TBDB_USERSTATUS_UNVERIFIED) == 0)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_UNVERIFIED;
    if (strcmp($status, TBDB_USERSTATUS_ACTIVE) == 0)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ACTIVE;

300 301 302
    #
    # Set the magic enviroment variable, if appropriate, for the sake of
    # any processes we might spawn. We prepend an HTTP_ on the front of
303
    # the variable name, so that it will get through suexec.
304 305 306 307 308
    #
    if ($admin && !$adminoff) {
    	putenv("HTTP_WITH_TB_ADMIN_PRIVS=1");
    }

309
    return $CHECKLOGIN_STATUS;
310 311 312 313
}

#
# This one checks for login, but then dies with an appropriate error
314 315
# message. The modifier allows you to turn off checks for specified
# conditions. 
316
#
317
function LOGGEDINORDIE($uid, $modifier = 0, $login_url = NULL) {
318 319
    global $TBBASE, $BASEPATH, $HTTP_COOKIE_VARS, $TBNAMECOOKIE;

Leigh B. Stoller's avatar
Leigh B. Stoller committed
320
    # If our login is not valid, then the uid is already set to "",
321 322 323 324
    # so refresh it to the cookie value. Then we can pass the right
    # uid to hcecklogin, so we can give the right error message.
    if ($uid=="") { $uid=$HTTP_COOKIE_VARS[$TBNAMECOOKIE]; }

325 326 327 328 329 330 331 332 333
    #
    # Allow the caller to specify a different URL to direct the user
    # to
    #
    if (!$login_url) {
	$login_url = "$TBBASE/login.php3?refer=1";
    }

    $link = "\n<a href=\"$login_url\">Please ".
334
	"log in again.</a>\n";
335

336
    if ($uid == FALSE)
337
        USERERROR("You do not appear to be logged in! $link", 1);
338
    
339
    $status = CHECKLOGIN($uid);
340 341 342

    switch ($status & CHECKLOGIN_STATUSMASK) {
    case CHECKLOGIN_NOTLOGGEDIN:
343
        USERERROR("You do not appear to be logged in! $link", 1);
344
        break;
345
    case CHECKLOGIN_TIMEDOUT:
346
        USERERROR("Your login has timed out! $link", 1);
347
        break;
348 349
    case CHECKLOGIN_MAYBEVALID:
        USERERROR("Your login cannot be verified. Are cookies turned on? ".
350
		  "Are you using https? Are you logged in using another ".
351
		  "browser or another machine? $link", 1);
352
        break;
353 354 355 356
    case CHECKLOGIN_LOGGEDIN:
	break;
    default:
	TBERROR("LOGGEDINORDIE failed mysteriously", 1);
357
    }
358 359 360 361 362 363 364

    $status = $status & ~$modifier;

    #
    # Check other conditions.
    #
    if ($status & CHECKLOGIN_PSWDEXPIRED)
365 366
        USERERROR("Your password has expired. ".
		  "<a href=moduserinfo.php3>Please change it now!</a>", 1);
367 368 369 370 371 372
    if ($status & CHECKLOGIN_FROZEN)
        USERERROR("Your account has been frozen!", 1);
    if ($status & (CHECKLOGIN_UNVERIFIED|CHECKLOGIN_NEWUSER))
        USERERROR("You have not verified your account yet!", 1);
    if ($status & CHECKLOGIN_UNAPPROVED)
        USERERROR("Your account has not been approved yet!", 1);
373 374
    if ($status & CHECKLOGIN_WEBONLY)
        USERERROR("Your account does not permit you to access this page!", 1);
375 376 377 378 379 380 381 382 383 384

    #
    # Lastly, check for nologins here. This heads off a bunch of other
    # problems and checks we would need.
    #
    if (NOLOGINS() && !ISADMIN($uid))
        USERERROR("Sorry. The Web Interface is ".
		  "<a href=nologins.php3>Temporarily Unavailable!</a>", 1);

    return $uid;
385 386 387
}

#
388 389 390 391
# Is this user an admin type, and is his admin bit turned on.
# Its actually incorrect to look at the $uid. Its the currently logged
# in user that has to be admin. So ignore the uid and make sure
# there is a login status.
392
#
393
function ISADMIN($uid = 1) {
394 395
    global $CHECKLOGIN_STATUS;
    
396 397
    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
	$uid=GETUID();
398
	TBERROR("ISADMIN: $uid is not logged in!", 1);
399
    }
400

401
    return (($CHECKLOGIN_STATUS &
402
	     (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_ISADMIN|CHECKLOGIN_ADMINOFF)) ==
403
	    (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_ISADMIN));
404 405
}

406
# Is this user a real administrator (ignore onoff bit).
407
function ISADMINISTRATOR() {
408 409 410 411 412 413 414 415 416 417
    global $CHECKLOGIN_STATUS;
    
    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS)
	TBERROR("ISADMIN: $uid is not logged in!", 1);

    return (($CHECKLOGIN_STATUS &
	     (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_ISADMIN)) ==
	    (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_ISADMIN));
}

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
# Is this user a planetlab user?
# TODO: I'd like to make this much faster since it will happen often. But,
# can't roll it into $CHECKLOGIN_STATUS, because we need to be able to tell
# even when they are logged out (ie. we only have their uid cookie)
function ISPLABUSER() {
    global $CHECKLOGIN_STATUS;

    $uid = GETUID();
    if (!$uid) {
	return 0;
    }
    $query_result =
	DBQueryFatal("SELECT plab_user FROM users WHERE uid='$uid'");
    if (!mysql_num_rows($query_result)) {
	return 0;
    }

    $row = mysql_fetch_row($query_result);
    if ($row[0]) {
	return 1;
    } else {
	return 0;
    }
}

443 444 445
#
# Attempt a login.
# 
446
function DOLOGIN($token, $password, $adminmode = 0) {
447 448
    global $TBAUTHCOOKIE, $TBAUTHDOMAIN, $TBAUTHTIMEOUT;
    global $TBNAMECOOKIE, $TBLOGINCOOKIE, $TBSECURECOOKIES;
449
    global $TBMAIL_OPS, $TBMAIL_AUDIT, $TBMAIL_WWW;
Leigh B. Stoller's avatar
Leigh B. Stoller committed
450 451
    
    # Caller makes these checks too.
452 453
    if ((!TBvalid_uid($token) && !TBvalid_email($token)) ||
	!isset($password) || $password == "") {
454 455
	return -1;
    }
456
    $now = time();
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
    #
    # Check for a frozen IP address; too many failures.
    #
    unset($iprow);
    unset($IP);
    if (isset($_SERVER['REMOTE_ADDR'])) {
	$IP = $_SERVER['REMOTE_ADDR'];
	
	$ip_result =
	    DBQueryFatal("select * from login_failures ".
			 "where IP='$IP'");

	if ($iprow = mysql_fetch_array($ip_result)) {
	    $ipfrozen = $iprow['frozen'];

	    if ($ipfrozen) {
		DBQueryFatal("update login_failures set ".
			     "       failcount=failcount+1, ".
			     "       failstamp='$now' ".
			     "where IP='$IP'");
		return -1;
	    }
	}
    }

    $user_result =
484
	DBQueryFatal("select uid,usr_pswd,admin,weblogin_frozen,".
485 486
		     "       weblogin_failcount,weblogin_failstamp, ".
		     "       usr_email,usr_name ".
487 488 489 490
		     "from users where ".
		     (TBvalid_email($token) ?
		      "usr_email='$token'" :
		      "uid='$token'"));
491 492 493 494

    #
    # Check password in the database against provided. 
    #
495 496
    do {
      if ($row = mysql_fetch_array($user_result)) {
497
	$uid         = $row['uid'];
498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515
        $db_encoding = $row['usr_pswd'];
	$isadmin     = $row['admin'];
	$frozen      = $row['weblogin_frozen'];
	$failcount   = $row['weblogin_failcount'];
	$failstamp   = $row['weblogin_failstamp'];
	$usr_email   = $row['usr_email'];
	$usr_name    = $row['usr_name'];

	# Check for frozen accounts, and for too many failures within
	# the last N minutes.
	if ($frozen) {
	    DBQueryFatal("update users set , ".
			 "       weblogin_failcount=weblogin_failcount+1, ".
			 "       weblogin_failstamp='$now' ".
			 "where uid='$uid'");
	    return -1;
	}
	
516
        $encoding = crypt("$password", $db_encoding);
517
        if (strcmp($encoding, $db_encoding)) {
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
	    #
	    # Bump count and check for too many failures within the
	    # last minute.
	    #
	    $failcount++;
	    if (($failstamp && $now - $failstamp > DOLOGIN_MAXUSERWAITTIME) ||
		!$failstamp) {
		$failstamp = $now;
		$failcount = 1;
	    }

	    if ($failcount > DOLOGIN_MAXUSERATTEMPTS) {
		$frozen = 1;
	    
		TBMAIL("$usr_name '$uid' <$usr_email>",
		   "Web Login Freeze: '$uid'",
		   "Your login has been frozen because there were too many\n".
		   "login failures from " . $_SERVER['REMOTE_ADDR'] . ".\n\n".
		   "Testbed Operations has been notified.\n",
		   "From: $TBMAIL_OPS\n".
		   "Cc: $TBMAIL_OPS\n".
		   "Bcc: $TBMAIL_AUDIT\n".
		   "Errors-To: $TBMAIL_WWW");
	    }

	    DBQueryFatal("update users set weblogin_frozen='$frozen', ".
			 "       weblogin_failcount='$failcount', ".
			 "       weblogin_failstamp='$failstamp' ".
			 "where uid='$uid'");
            break;
548 549 550 551 552 553
        }
        #
        # Pass! Insert a record in the login table for this uid with
        # the new hash value. If the user is already logged in, thats
        # okay; just update it in place with a new hash and timeout. 
        #
554
	$timeout = $now + $TBAUTHTIMEOUT;
555
	$hashkey = GENHASH();
556 557 558
        $query_result =
	    DBQueryFatal("SELECT timeout FROM login WHERE uid='$uid'");
	
559
	if (mysql_num_rows($query_result)) {
560 561 562
	    DBQueryFatal("UPDATE login set ".
			 "timeout='$timeout', hashkey='$hashkey' ".
			 "WHERE uid='$uid'");
563 564
	}
	else {
565 566
	    DBQueryFatal("INSERT into login (uid, hashkey, timeout) ".
			 "VALUES ('$uid', '$hashkey', '$timeout')");
567 568
	}

569
	#
570
	# Usage stats. 
571
	#
572 573 574 575
	DBQueryFatal("update user_stats set ".
		     " weblogin_count=weblogin_count+1, ".
		     " weblogin_last=now() ".
		     "where uid='$uid'");
576

577
	#
578 579 580 581
	# Issue the cookie requests so that subsequent pages come back
	# with the hash value and auth usr embedded.

	#
582 583 584 585 586
	# For the hashkey, we use a zero timeout so that the cookie is
	# a session cookie; killed when the browser is exited. Hopefully this
	# keeps the key from going to disk on the client machine. The cookie
	# lives as long as the browser is active, but we age the cookie here
	# at the server so it will become invalid at some point.
587
	#
588
	setcookie($TBAUTHCOOKIE, $hashkey, 0, "/",
589
                  $TBAUTHDOMAIN, $TBSECURECOOKIES);
590

591 592 593 594 595 596 597 598 599 600
	#
	# Another cookie, to help in menu generation. See above in
	# checklogin. This cookie is a simple hash of the real hash,
	# intended to indicate if the current browser holds a real hash.
	# All this does is change the menu options presented, imparting
	# no actual privs. 
	#
	$crc = bin2hex(mhash(MHASH_CRC32, $hashkey));
	setcookie($TBLOGINCOOKIE, $crc, 0, "/", $TBAUTHDOMAIN, 0);

601 602 603 604 605 606 607 608
	#
	# We give this a really long timeout. We want to remember who the
	# the user was each time they load a page, and more importantly,
	# each time they come back to the main page so we can fill in their
	# user name. NOTE: This cookie is integral to authorization, since
	# we do not pass around the UID anymore, but look for it in the
	# cookie.
	# 
609
	$timeout = $now + (60 * 60 * 24 * 32);
610 611
	setcookie($TBNAMECOOKIE, $uid, $timeout, "/", $TBAUTHDOMAIN, 0);

612
	#
613 614 615 616 617
	# Set adminoff on new logins, unless user requested to be
	# logged in as admin (and is an admin of course!). This is
	# primarily to bypass the nologins directive which makes it
	# impossible for an admin to login when the web interface is
	# turned off. 
618
	#
619 620 621 622
	$adminoff = 1;
	if ($adminmode && $isadmin) {
	    $adminoff = 0;
	}
623 624 625
	DBQueryFatal("update users set adminoff=$adminoff, ".
		     "       weblogin_failcount=0,weblogin_failstamp=0 ".
		     "where uid='$uid'");
626

627
	return 0;
628 629
      }
    } while (0);
630 631 632
    #
    # No such user
    #
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
    if (!isset($IP))
	return -1;
    
    if (isset($iprow)) {
	$ipfailcount = $iprow['failcount'];
	$ipfailstamp = $iprow['failstamp'];

        #
        # Bump count and check for too many (8) failures within the
        # last 2 minutes. Note that aging is passive; we do not have
        # a daemon cleaning out old records, so we have to age on the fly. 
        #
	$ipfailcount++;
	if (($ipfailstamp && $now - $ipfailstamp > DOLOGIN_MAXIPWAITTIME) ||
	    !$ipfailstamp) {
	    $ipfailstamp = $now;
	    $ipfailcount = 1;
	}
    }
    else {
	$ipfailcount = 1;
	$ipfailstamp = $now;
	$ipfrozen    = 0;
    }
    
    if ($ipfailcount > DOLOGIN_MAXIPATTEMPTS) {
	$ipfrozen = 1;
	    
	TBMAIL($TBMAIL_OPS,
	       "Web Login Freeze: '$IP'",
	       "Logins has been frozen because there were too many login\n".
664
	       "failures from $IP. Last attempted uid was '$token'.\n\n",
665 666 667 668 669 670 671 672 673
	       "From: $TBMAIL_OPS\n".
	       "Bcc: $TBMAIL_AUDIT\n".
	       "Errors-To: $TBMAIL_WWW");
    }
    DBQueryFatal("replace into login_failures set ".
		 "       IP='$IP', ".
		 "       frozen='$ipfrozen', ".
		 "       failcount='$ipfailcount', ".
		 "       failstamp='$ipfailstamp'");
674 675 676
    return -1;
}

677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694

#
# Verify a password
# 
function VERIFYPASSWD($uid, $password) {
    if (! isset($password) ||
	strcmp($password, "") == 0) {
	return -1;
    }

    $query_result =
	DBQueryFatal("SELECT usr_pswd FROM users WHERE uid='$uid'");

    #
    # Check password in the database against provided. 
    #
    if ($row = mysql_fetch_row($query_result)) {
        $db_encoding = $row[0];
695
        $encoding = crypt("$password", $db_encoding);
696 697 698 699 700 701 702 703 704
	
        if (strcmp($encoding, $db_encoding)) {
            return -1;
	}
	return 0;
    }
    return -1;
}

705
#
706
# Log out a UID.
707 708
#
function DOLOGOUT($uid) {
709
    global $CHECKLOGIN_STATUS, $TBAUTHCOOKIE, $TBLOGINCOOKIE, $TBAUTHDOMAIN;
710

711 712 713 714 715
    # Pedantic check.
    if (!TBvalid_uid($uid)) {
	return 1;
    }

716 717 718 719
    $CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;

    $query_result =
	DBQueryFatal("SELECT hashkey timeout FROM login WHERE uid='$uid'");
720 721 722

    # Not logged in.
    if (($row = mysql_fetch_array($query_result)) == 0) {
723
	return 1;
724 725 726
    }

    $hashkey = $row[hashkey];
727
    $timeout = time() - 1000000;
728

729
    DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
730 731

    #
732
    # Issue a cookie request to delete the cookies. 
733
    #
734
    setcookie($TBAUTHCOOKIE, "", $timeout, "/", $TBAUTHDOMAIN, 0);
735
    setcookie($TBLOGINCOOKIE, "", $timeout, "/", $TBAUTHDOMAIN, 0);
736 737 738 739

    return 0;
}

740
#
Chad Barb's avatar
 
Chad Barb committed
741
# Simple "nologins" support.
742 743
#
function NOLOGINS() {
744
    global $CHECKLOGIN_NOLOGINS;
745

Chad Barb's avatar
 
Chad Barb committed
746 747
    if ($CHECKLOGIN_NOLOGINS == -1) {
	$CHECKLOGIN_NOLOGINS = TBGetSiteVar("web/nologins");
748
    }
Chad Barb's avatar
 
Chad Barb committed
749
	
750
    return $CHECKLOGIN_NOLOGINS;
751 752
}

753 754 755
function LASTWEBLOGIN($uid) {
    global $TBDBNAME;

756
    $query_result =
757
        DBQueryFatal("SELECT weblogin_last from user_stats where uid='$uid'");
758 759 760
    
    if (mysql_num_rows($query_result)) {
	$lastrow      = mysql_fetch_array($query_result);
761
	return $lastrow[weblogin_last];
762 763 764 765
    }
    return 0;
}

766 767 768 769 770 771 772 773 774 775 776
function HASREALACCOUNT($uid) {
    $query_result =
	DBQueryFatal("select status,webonly from users where uid='$uid'");

    if (!mysql_num_rows($query_result)) {
	return 0;
    }
    $row = mysql_fetch_array($query_result);
    $status  = $row[0];
    $webonly = $row[1];

777 778 779
    if ($webonly ||
	(strcmp($status, TBDB_USERSTATUS_ACTIVE) &&
	 strcmp($status, TBDB_USERSTATUS_FROZEN))) {
780 781 782 783 784
	return 0;
    }
    return 1;
}

785 786 787 788
#
# Beware empty spaces (cookies)!
# 
?>