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<?php
#
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# EMULAB-COPYRIGHT
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# Copyright (c) 2000-2006 University of Utah and the Flux Group.
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# All rights reserved.
#
#
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# Login support: Beware empty spaces (cookies)!
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#

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# These global are to prevent repeated calls to the DB. 
#
$CHECKLOGIN_STATUS		= -1;
$CHECKLOGIN_UID			= 0;
$CHECKLOGIN_NOLOGINS		= -1;
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$CHECKLOGIN_WIKINAME            = "";
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$CHECKLOGIN_IDLETIME            = 0;
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#
# New Mapping. 
#
define("CHECKLOGIN_NOSTATUS",		-1);
define("CHECKLOGIN_NOTLOGGEDIN",	0);
define("CHECKLOGIN_LOGGEDIN",		1);
define("CHECKLOGIN_TIMEDOUT",		2);
define("CHECKLOGIN_MAYBEVALID",		4);
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define("CHECKLOGIN_STATUSMASK",		0x0000ff);
define("CHECKLOGIN_MODMASK",		0xffff00);
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#
# 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. 
#
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define("CHECKLOGIN_NEWUSER",		0x000100);
define("CHECKLOGIN_UNVERIFIED",		0x000200);
define("CHECKLOGIN_UNAPPROVED",		0x000400);
define("CHECKLOGIN_ACTIVE",		0x000800);
define("CHECKLOGIN_USERSTATUS",		0x000f00);
define("CHECKLOGIN_PSWDEXPIRED",	0x001000);
define("CHECKLOGIN_FROZEN",		0x002000);
define("CHECKLOGIN_ISADMIN",		0x004000);
define("CHECKLOGIN_TRUSTED",		0x008000);
define("CHECKLOGIN_CVSWEB",		0x010000);
define("CHECKLOGIN_ADMINOFF",		0x020000);
define("CHECKLOGIN_WEBONLY",		0x040000);
define("CHECKLOGIN_PLABUSER",		0x080000);
define("CHECKLOGIN_STUDLY",		0x100000);
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define("CHECKLOGIN_WIKIONLY",		0x200000);
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define("CHECKLOGIN_OPSGUY",		0x400000);	# Member of emulab-ops.
define("CHECKLOGIN_ISFOREIGN_ADMIN",	0x800000);	# Admin of another Emulab. 
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#
# Constants for tracking possible login attacks.
#
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define("DOLOGIN_MAXUSERATTEMPTS",	15);
define("DOLOGIN_MAXIPATTEMPTS",		25);
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#
# 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);
    }
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    $random_bytes = fread($fp, 128);
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    fclose($fp);

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

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#
# 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
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# and HASH back, and then check the DB to see if the user is really
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# logged in.
# 
function GETLOGIN() {
    if (($uid = GETUID()) == FALSE)
	    return FALSE;

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    $check = CHECKLOGIN($uid);

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    if ($check & (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_MAYBEVALID))
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	    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() {
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    global $TBNAMECOOKIE;
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    global $nocookieuid;
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    $curname = FALSE;
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    # XXX - nocookieuid is sent by netbuild applet in URL.
    if (isset($_GET['nocookieuid'])) {
	$curname = $_GET['nocookieuid'];
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    }
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    elseif (isset($_COOKIE[$TBNAMECOOKIE])) {
	$curname = $_COOKIE[$TBNAMECOOKIE];
    }
    else
	return FALSE;
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    # Verify valid string (no special chars like single/double quotes!).
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    # 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)) {
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	return FALSE;
    }
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    return $curname;
}

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#
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# Verify a login by sucking a UIDs current hash value out of the database.
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# 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.
#
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# Returns a combination of the CHECKLOGIN values above.
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#
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function CHECKLOGIN($uid) {
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    global $TBAUTHCOOKIE, $TBLOGINCOOKIE, $HTTP_COOKIE_VARS, $TBAUTHTIMEOUT;
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    global $CHECKLOGIN_STATUS, $CHECKLOGIN_UID, $CHECKLOGIN_NODETYPES;
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    global $CHECKLOGIN_WIKINAME, $TBOPSPID;
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    global $EXPOSEARCHIVE, $EXPOSETEMPLATES;
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    global $nocookieauth;
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    #
    # If we already figured this out, do not duplicate work!
    #
    if ($CHECKLOGIN_STATUS != CHECKLOGIN_NOSTATUS) {
	return $CHECKLOGIN_STATUS;
    }
    $CHECKLOGIN_UID = $uid;
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    # 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];
    }
    
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    #
    # Note that we get multiple rows back because of the group_membership
    # join. No big deal.
    # 
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    $query_result =
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	DBQueryFatal("select NOW()>=u.pswd_expires,l.hashkey,l.timeout, ".
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		     "       status,admin,cvsweb,g.trust,adminoff,webonly, " .
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		     "       user_interface,n.type,u.stud,u.wikiname, ".
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		     "       u.wikionly,g.pid,u.foreign_admin " .
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		     " from users as u ".
		     "left join login as l on l.uid=u.uid ".
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		     "left join group_membership as g on g.uid=u.uid ".
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		     "left join nodetypeXpid_permissions as n on g.pid=n.pid " .
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		     "where u.uid='$uid'");
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    # No such user.
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    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
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    # values and the pid. pid is a hack.
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    #
    $trusted = 0;
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    $opsguy  = 0;
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    while ($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;
	}
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	$adminoff = $row[7];
	$webonly  = $row[8];
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	$interface= $row[9];
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	$type     = $row[10];
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	$stud     = $row[11];
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	$wikiname = $row[12];
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	$wikionly = $row[13];
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	# Check for an ops guy.
	$pid = $row[14];
	if ($pid == $TBOPSPID) {
	    $opsguy = 1;
	}
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	# Set foreign_admin=1 for admins of another Emulab.
	$foreign_admin   = $row[15];

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	$CHECKLOGIN_NODETYPES[$type] = 1;
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    }
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    #
    # If user exists, but login has no entry, quit now.
    #
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    if (!$hashkey) {
	$CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	return $CHECKLOGIN_STATUS;
    }
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    #
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    # Check for frozen account. Might do something interesting later.
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    #
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    if (! strcmp($status, TBDB_USERSTATUS_FROZEN)) {
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	DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
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	$CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	return $CHECKLOGIN_STATUS;
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    }

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    #
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    # Check for expired login. It does not matter if the cookie matches,
    # kill the entry anyway so the user is officially logged out.
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    #
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    if (time() > $timeout) {
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	DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
	$CHECKLOGIN_STATUS = CHECKLOGIN_TIMEDOUT;
	return $CHECKLOGIN_STATUS;
    }
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    $CHECKLOGIN_IDLETIME = time() - ($timeout - $TBAUTHTIMEOUT);
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    #
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    # We know the login has not expired. The problem is that we might not
    # have received a cookie since that is set to transfer only when using
    # https. However, we do not want the menu to be flipping back and forth
    # each time the user uses http (say, for documentation), and so the lack
    # of a cookie does not provide enough info to determine if the user is
    # logged in or not from the current browser. Also, we want to allow for
    # a user to switch browsers, and not get confused by getting a uid but
    # no valid cookie from the new browser. In that case the user should just
    # be able to login from the new browser; gets a standard not-logged-in
    # front page. In order to accomplish this, we need another cookie that is
    # set on login, cleared on logout.
    #
    if (isset($curhash)) {
	#
	# Got a cookie (https).
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	#
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	if ($curhash != $hashkey) {
	    #
	    # User is not logged in from this browser. Must be stale.
	    # 
	    $CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;
	    return $CHECKLOGIN_STATUS;
	}
	else {
            #
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	    # User is logged in.
	    #
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	    $CHECKLOGIN_STATUS = CHECKLOGIN_LOGGEDIN;
	}
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    }
    else {
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	#
	# 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;
	}
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    }

    #
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    # Now add in the modifiers.
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    #
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    if ($expired)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_PSWDEXPIRED;
    if ($admin)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ISADMIN;
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    if ($adminoff)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ADMINOFF;
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    if ($webonly)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_WEBONLY;
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    if ($wikionly)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_WIKIONLY;
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    if ($trusted)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_TRUSTED;
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    if ($stud)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_STUDLY;
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    if ($cvsweb)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_CVSWEB;
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    if ($interface == TBDB_USER_INTERFACE_PLAB)
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	$CHECKLOGIN_STATUS |= CHECKLOGIN_PLABUSER;
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    if (strcmp($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)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ACTIVE;
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    if (isset($wikiname) && $wikiname != "")
	$CHECKLOGIN_WIKINAME = $wikiname;
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    if ($opsguy)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_OPSGUY;
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    if ($foreign_admin)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_ISFOREIGN_ADMIN;
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    #
    # Set the magic enviroment variable, if appropriate, for the sake of
    # any processes we might spawn. We prepend an HTTP_ on the front of
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    # the variable name, so that it will get through suexec.
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    #
    if ($admin && !$adminoff) {
    	putenv("HTTP_WITH_TB_ADMIN_PRIVS=1");
    }
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    # XXX Temporary.
    if ($stud) {
	$EXPOSEARCHIVE = 1;
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	$EXPOSETEMPLATES = 1;
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    }
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    return $CHECKLOGIN_STATUS;
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}

#
# This one checks for login, but then dies with an appropriate error
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# message. The modifier allows you to turn off checks for specified
# conditions. 
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#
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function LOGGEDINORDIE($uid, $modifier = 0, $login_url = NULL) {
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    global $TBBASE, $BASEPATH, $HTTP_COOKIE_VARS, $TBNAMECOOKIE;
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    global $TBAUTHTIMEOUT;
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    # If our login is not valid, then the uid is already set to "",
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    # so refresh it to the cookie value. Then we can pass the right
    # uid to hcecklogin, so we can give the right error message.
    if ($uid=="") { $uid=$HTTP_COOKIE_VARS[$TBNAMECOOKIE]; }

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    #
    # 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 ".
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	"log in again.</a>\n";
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    if ($uid == FALSE)
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        USERERROR("You do not appear to be logged in! $link", 1);
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    $status = CHECKLOGIN($uid);
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    switch ($status & CHECKLOGIN_STATUSMASK) {
    case CHECKLOGIN_NOTLOGGEDIN:
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        USERERROR("You do not appear to be logged in! $link", 1);
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        break;
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    case CHECKLOGIN_TIMEDOUT:
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        USERERROR("Your login has timed out! $link", 1);
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        break;
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    case CHECKLOGIN_MAYBEVALID:
        USERERROR("Your login cannot be verified. Are cookies turned on? ".
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		  "Are you using https? Are you logged in using another ".
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		  "browser or another machine? $link", 1);
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        break;
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    case CHECKLOGIN_LOGGEDIN:
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        #
	# 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;

	DBQueryFatal("UPDATE login set timeout='$timeout' where uid='$uid'");
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	break;
    default:
	TBERROR("LOGGEDINORDIE failed mysteriously", 1);
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    }
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    $status = $status & ~$modifier;

    #
    # Check other conditions.
    #
    if ($status & CHECKLOGIN_PSWDEXPIRED)
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        USERERROR("Your password has expired. ".
		  "<a href=moduserinfo.php3>Please change it now!</a>", 1);
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    if ($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);
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    if (($status & CHECKLOGIN_WEBONLY) && ! ISADMIN($uid))
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        USERERROR("Your account does not permit you to access this page!", 1);
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    if (($status & CHECKLOGIN_WIKIONLY) && ! ISADMIN($uid))
        USERERROR("Your account does not permit you to access this page!", 1);
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    #
    # 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;
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}

#
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# Is this user an admin type, and is his admin bit turned on.
# Its actually incorrect to look at the $uid. Its the currently logged
# in user that has to be admin. So ignore the uid and make sure
# there is a login status.
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#
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function ISADMIN($uid = 1) {
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    global $CHECKLOGIN_STATUS;
    
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    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
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	return 0;
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    }
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    return (($CHECKLOGIN_STATUS &
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	     (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_ISADMIN|CHECKLOGIN_ADMINOFF)) ==
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	    (CHECKLOGIN_LOGGEDIN|CHECKLOGIN_ISADMIN));
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}

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# Is this user an admin of another Emulab.
function ISFOREIGN_ADMIN($uid = 1) {
    global $CHECKLOGIN_STATUS;

    # Definitely not, if not logged in.
    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
	return 0;
    }

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

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function STUDLY() {
    global $CHECKLOGIN_STATUS;
    
    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
	$uid=GETUID();
	TBERROR("STUDLY: $uid is not logged in!", 1);
    }

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

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function OPSGUY() {
    global $CHECKLOGIN_STATUS;
    
    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
	$uid=GETUID();
	TBERROR("OPSGUY: $uid is not logged in!", 1);
    }

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

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function WIKIONLY() {
    global $CHECKLOGIN_STATUS;
    
    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
	$uid=GETUID();
	TBERROR("WIKIONLY: $uid is not logged in!", 1);
    }

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

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# Is this user a real administrator (ignore onoff bit).
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function ISADMINISTRATOR() {
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    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));
}

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# Is this user a planetlab user? Returns 1 if they are, 0 if not.
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function ISPLABUSER() {
    global $CHECKLOGIN_STATUS;

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    if ($CHECKLOGIN_STATUS == CHECKLOGIN_NOSTATUS) {
	#
	# For users who are not logged in, we need to check the database
	#
	$uid = GETUID();
	if (!$uid) {
	    return 0;
	}
	$query_result =
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	    DBQueryFatal("SELECT user_interface FROM users WHERE uid='$uid'");
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	if (!mysql_num_rows($query_result)) {
	    return 0;
	}
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	$row = mysql_fetch_row($query_result);
	if ($row[0]) {
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	    return ($row[0] == TBDB_USER_INTERFACE_PLAB);
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	} else {
	    return 0;
	}
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    } else {
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	#
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	# For logged-in users, we recorded it in the the login status
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	#
	return (($CHECKLOGIN_STATUS &
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		 (CHECKLOGIN_PLABUSER)) ==
		(CHECKLOGIN_PLABUSER));
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    }
}

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#
# Check to see if a user is allowed, in some project, to use the given node
# type. Returns 1 if allowed, 0 if not.
#
# NOTE: This is NOT intended as a real permissions check. It is intended only
# for display purposes (ie. deciding whether or not to give the user a link to
# the plab_ez page.) It does not require the user to be actually logged in, so
# that it still works for pages fetched through http. Thus, it may be possible
# for a clever user to fake it out.
#
function NODETYPE_ALLOWED($type) {
    global $CHECKLOGIN_NODETYPES;
    $uid = GETUID();
    if (!$uid) {
	return 0;
    }
    if ($CHECKLOGIN_NODETYPES[$type]) {
	return 1;
    } else {
	return 0;
    }
}

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#
# Attempt a login.
# 
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function DOLOGIN($token, $password, $adminmode = 0) {
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    global $TBAUTHCOOKIE, $TBAUTHDOMAIN, $TBAUTHTIMEOUT;
    global $TBNAMECOOKIE, $TBLOGINCOOKIE, $TBSECURECOOKIES;
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    global $TBMAIL_OPS, $TBMAIL_AUDIT, $TBMAIL_WWW;
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    global $WIKISUPPORT, $WIKICOOKIENAME;
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    global $BUGDBSUPPORT, $BUGDBCOOKIENAME;
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    # Caller makes these checks too.
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    if ((!TBvalid_uid($token) && !TBvalid_email($token)) ||
	!isset($password) || $password == "") {
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	return -1;
    }
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    $now = time();
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595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
    #
    # Check for a frozen IP address; too many failures.
    #
    unset($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;
	    }
	}
    }

    $user_result =
621
	DBQueryFatal("select uid,usr_pswd,admin,weblogin_frozen,".
622
		     "       weblogin_failcount,weblogin_failstamp, ".
623
		     "       usr_email,usr_name,unix_uid ".
624 625 626 627
		     "from users where ".
		     (TBvalid_email($token) ?
		      "usr_email='$token'" :
		      "uid='$token'"));
628 629 630 631

    #
    # Check password in the database against provided. 
    #
632 633
    do {
      if ($row = mysql_fetch_array($user_result)) {
634
	$uid         = $row['uid'];
635 636 637 638 639 640 641
        $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'];
642
	$uid_idx     = $row['unix_uid'];
643

644 645
	# Check for frozen accounts. We do not update the IP record when
	# an account is frozen.
646
	if ($frozen) {
647
	    DBQueryFatal("update users set ".
648 649 650 651 652 653
			 "       weblogin_failcount=weblogin_failcount+1, ".
			 "       weblogin_failstamp='$now' ".
			 "where uid='$uid'");
	    return -1;
	}
	
654
        $encoding = crypt("$password", $db_encoding);
655
        if (strcmp($encoding, $db_encoding)) {
656
	    #
657
	    # Bump count and check for too many consecutive failures.
658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675
	    #
	    $failcount++;
	    if ($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', ".
676
			 "       weblogin_failstamp='$now' ".
677 678
			 "where uid='$uid'");
            break;
679
        }
680
	#
681
	# Pass!
682 683
	#

684
	#
685 686 687 688 689
	# 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. 
690
	#
691 692 693 694
	$adminoff = 1;
	if ($adminmode && $isadmin) {
	    $adminoff = 0;
	}
695 696 697 698 699 700 701 702 703 704 705 706 707 708 709

        #
        # Insert a record in the login table for this uid.
	#
	if (DOLOGIN_MAGIC($uid, $adminoff) < 0) {
	    return -1;
	}

	#
	# Usage stats. 
	#
	DBQueryFatal("update user_stats set ".
		     " weblogin_count=weblogin_count+1, ".
		     " weblogin_last=now() ".
		     "where uid_idx='$uid_idx'");
710

711 712 713 714
	# Clear IP record since we have a sucessful login from the IP.
	if (isset($IP)) {
	    DBQueryFatal("delete from login_failures where IP='$IP'");
	}
715
	return 0;
716 717
      }
    } while (0);
718 719 720
    #
    # No such user
    #
721
    if (!isset($IP)) {
722
	return -1;
723 724 725
    }
	
    $ipfrozen = 0;
726 727 728 729
    if (isset($iprow)) {
	$ipfailcount = $iprow['failcount'];

        #
730
        # Bump count.
731 732 733 734
        #
	$ipfailcount++;
    }
    else {
735 736 737
	#
	# First failure.
	# 
738 739
	$ipfailcount = 1;
    }
740 741 742 743

    #
    # Check for too many consecutive failures.
    #
744 745 746 747 748 749
    if ($ipfailcount > DOLOGIN_MAXIPATTEMPTS) {
	$ipfrozen = 1;
	    
	TBMAIL($TBMAIL_OPS,
	       "Web Login Freeze: '$IP'",
	       "Logins has been frozen because there were too many login\n".
750
	       "failures from $IP. Last attempted uid was '$token'.\n\n",
751 752 753 754 755 756 757 758
	       "From: $TBMAIL_OPS\n".
	       "Bcc: $TBMAIL_AUDIT\n".
	       "Errors-To: $TBMAIL_WWW");
    }
    DBQueryFatal("replace into login_failures set ".
		 "       IP='$IP', ".
		 "       frozen='$ipfrozen', ".
		 "       failcount='$ipfailcount', ".
759
		 "       failstamp='$now'");
760 761 762
    return -1;
}

763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858
function DOLOGIN_MAGIC($uid, $adminoff = 1)
{
    global $TBAUTHCOOKIE, $TBAUTHDOMAIN, $TBAUTHTIMEOUT;
    global $TBNAMECOOKIE, $TBLOGINCOOKIE, $TBSECURECOOKIES;
    global $TBMAIL_OPS, $TBMAIL_AUDIT, $TBMAIL_WWW;
    global $WIKISUPPORT, $WIKICOOKIENAME;
    global $BUGDBSUPPORT, $BUGDBCOOKIENAME;
    
    # Caller makes these checks too.
    if (!TBvalid_uid($uid)) {
	return -1;
    }
    $now = time();

    #
    # 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. 
    #
    $timeout = $now + $TBAUTHTIMEOUT;
    $hashkey = GENHASH();
    $query_result =
	DBQueryFatal("SELECT timeout FROM login WHERE uid='$uid'");
	
    if (mysql_num_rows($query_result)) {
	DBQueryFatal("UPDATE login set ".
		     "timeout='$timeout', hashkey='$hashkey' ".
		     "WHERE uid='$uid'");
    }
    else {
	DBQueryFatal("INSERT into login (uid, hashkey, timeout) ".
		     "VALUES ('$uid', '$hashkey', '$timeout')");
    }

    #
    # Issue the cookie requests so that subsequent pages come back
    # with the hash value and auth usr embedded.

    #
    # 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.
    #
    setcookie($TBAUTHCOOKIE, $hashkey, 0, "/",
	      $TBAUTHDOMAIN, $TBSECURECOOKIES);

    #
    # 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);

    #
    # 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.
    # 
    $timeout = $now + (60 * 60 * 24 * 32);
    setcookie($TBNAMECOOKIE, $uid, $timeout, "/", $TBAUTHDOMAIN, 0);

    #
    # Clear the existing Wiki cookie so that there is not an old one
    # for a different user, sitting in the brower. 
    # 
    if ($WIKISUPPORT) {
	$flushtime = time() - 1000000;
	    
	setcookie($WIKICOOKIENAME, "", $flushtime, "/",
		  $TBAUTHDOMAIN, $TBSECURECOOKIES);
    }
	
    #
    # Ditto for bugdb
    # 
    if ($BUGDBSUPPORT) {
	$flushtime = time() - 1000000;
	    
	setcookie($BUGDBCOOKIENAME, "", $flushtime, "/",
		  $TBAUTHDOMAIN, $TBSECURECOOKIES);
    }
	
    DBQueryFatal("update users set adminoff=$adminoff, ".
		 "       weblogin_failcount=0,weblogin_failstamp=0 ".
		 "where uid='$uid'");

    return 0;
}
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876

#
# 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];
877
        $encoding = crypt("$password", $db_encoding);
878 879 880 881 882 883 884 885 886
	
        if (strcmp($encoding, $db_encoding)) {
            return -1;
	}
	return 0;
    }
    return -1;
}

887
#
888
# Log out a UID.
889 890
#
function DOLOGOUT($uid) {
891
    global $CHECKLOGIN_STATUS, $TBAUTHCOOKIE, $TBLOGINCOOKIE, $TBAUTHDOMAIN;
892
    global $WIKISUPPORT, $WIKICOOKIENAME;
893
    global $BUGDBSUPPORT, $BUGDBCOOKIENAME;
894

895 896 897 898 899
    # Pedantic check.
    if (!TBvalid_uid($uid)) {
	return 1;
    }

900 901 902 903
    $CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;

    $query_result =
	DBQueryFatal("SELECT hashkey timeout FROM login WHERE uid='$uid'");
904 905 906

    # Not logged in.
    if (($row = mysql_fetch_array($query_result)) == 0) {
907
	return 1;
908 909 910
    }

    $hashkey = $row[hashkey];
911
    $timeout = time() - 1000000;
912

913
    DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
914 915

    #
916
    # Issue a cookie request to delete the cookies. 
917
    #
918
    setcookie($TBAUTHCOOKIE, "", $timeout, "/", $TBAUTHDOMAIN, 0);
919
    setcookie($TBLOGINCOOKIE, "", $timeout, "/", $TBAUTHDOMAIN, 0);
920 921 922
    if ($WIKISUPPORT) {
	setcookie($WIKICOOKIENAME, "", $timeout, "/", $TBAUTHDOMAIN, 0);
    }
923 924 925
    if ($BUGDBSUPPORT) {
	setcookie($BUGDBCOOKIENAME, "", $timeout, "/", $TBAUTHDOMAIN, 0);
    }
926 927 928 929

    return 0;
}

930
#
931
# Simple "nologins" support.
932 933
#
function NOLOGINS() {
934
    global $CHECKLOGIN_NOLOGINS;
935

936 937
    if ($CHECKLOGIN_NOLOGINS == -1) {
	$CHECKLOGIN_NOLOGINS = TBGetSiteVar("web/nologins");
938
    }
939
	
940
    return $CHECKLOGIN_NOLOGINS;
941 942
}

943 944 945
function LASTWEBLOGIN($uid) {
    global $TBDBNAME;

946
    $query_result =
947 948 949
        DBQueryFatal("select weblogin_last from users as u ".
		     "left join user_stats as s on s.uid_idx=u.unix_uid ".
		     "where u.uid='$uid'");
950 951 952
    
    if (mysql_num_rows($query_result)) {
	$lastrow      = mysql_fetch_array($query_result);
953
	return $lastrow[weblogin_last];
954 955 956 957
    }
    return 0;
}

958 959
function HASREALACCOUNT($uid) {
    $query_result =
960 961
	DBQueryFatal("select status,webonly,wikionly from users ".
		     "where uid='$uid'");
962 963 964 965 966

    if (!mysql_num_rows($query_result)) {
	return 0;
    }
    $row = mysql_fetch_array($query_result);
967 968 969
    $status   = $row[0];
    $webonly  = $row[1];
    $wikionly = $row[2];
970

971
    if ($webonly || $wikionly ||
972 973
	(strcmp($status, TBDB_USERSTATUS_ACTIVE) &&
	 strcmp($status, TBDB_USERSTATUS_FROZEN))) {
974 975 976 977 978
	return 0;
    }
    return 1;
}

979 980 981 982
#
# Beware empty spaces (cookies)!
# 
?>