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<?php
#
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# EMULAB-COPYRIGHT
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# Copyright (c) 2000-2003 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;

#
# 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);
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define("CHECKLOGIN_ADMINOFF",		0x20000);
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define("CHECKLOGIN_WEBONLY",		0x40000);
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#
# Constants for tracking possible login attacks.
#
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define("DOLOGIN_MAXUSERATTEMPTS",	8);
define("DOLOGIN_MAXUSERWAITTIME",	100);	# Seconds
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define("DOLOGIN_MAXIPATTEMPTS",		8);
define("DOLOGIN_MAXIPWAITTIME",		120);	# Seconds

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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!).
    if (!TBvalid_uid($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, $HTTP_COOKIE_VARS, $TBAUTHTIMEOUT;
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    global $CHECKLOGIN_STATUS, $CHECKLOGIN_UID;
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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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    $query_result =
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	DBQueryFatal("select NOW()>=u.pswd_expires,l.hashkey,l.timeout, ".
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		     "       status,admin,cvsweb,g.trust,adminoff,webonly " .
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		     " from users as u ".
		     "left join login as l on l.uid=u.uid ".
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		     "left join group_membership as g on g.uid=u.uid ".
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		     "where u.uid='$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
    # 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;
	}
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	$adminoff = $row[7];
	$webonly  = $row[8];
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    }
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    #
    # If user exists, but login has no entry, quit now.
    #
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    if (!$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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    #
    # Check for expired login or for a hash that mismatches. Treat the same.
    #
    if ((time() > $timeout) ||
	(isset($curhash) && $curhash && strcmp($curhash, $hashkey))) {
	
        #
        # Clear out the database entry for completeness.
        #
	DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
	$CHECKLOGIN_STATUS = CHECKLOGIN_TIMEDOUT;
	return $CHECKLOGIN_STATUS;
    }

    #
    # We know the login has not expired. We also know from the above
    # test that the hashkey was either null or matched. 
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    # 
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    if (strcmp($curhash, $hashkey) == 0) {
        #
   	# We 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.
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	#
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	$timeout = time() + $TBAUTHTIMEOUT;

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

	$CHECKLOGIN_STATUS = CHECKLOGIN_LOGGEDIN;
    }
    else {
        #
	# A login is valid, but we have no proof yet. Cookies off?
	# 
	$CHECKLOGIN_STATUS = CHECKLOGIN_MAYBEVALID;
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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)
	$CHECKLOGIN_STATUS |= CHECKLOGIN_WEBONLY;
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    if ($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;

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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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    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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    # 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:
	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 ($status & CHECKLOGIN_WEBONLY)
        USERERROR("Your account does not permit you to access this page!", 1);
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    #
    # Lastly, check for nologins here. This heads off a bunch of other
    # problems and checks we would need.
    #
    if (NOLOGINS() && !ISADMIN($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) {
	$uid=GETUID();
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	TBERROR("ISADMIN: $uid is not logged in!", 1);
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    }
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    return (($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 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?
# 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;
    }
}

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#
# Attempt a login.
# 
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function DOLOGIN($uid, $password, $adminmode = 0) {
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    global $TBDBNAME, $TBAUTHCOOKIE, $TBAUTHDOMAIN, $TBAUTHTIMEOUT;
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    global $TBNAMECOOKIE, $TBSECURECOOKIES;
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    global $TBMAIL_OPS, $TBMAIL_AUDIT, $TBMAIL_WWW;
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    # Caller makes these checks too.
    if (!TBvalid_uid($uid) || !isset($password) || $password == "") {
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	return -1;
    }
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    $now = time();
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    #
    # Check for a frozen IP address; too many failures.
    #
    unset($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;
	    }
	}
    }

    $user_result =
	DBQueryFatal("select usr_pswd,admin,weblogin_frozen,".
		     "       weblogin_failcount,weblogin_failstamp, ".
		     "       usr_email,usr_name ".
		     "from users where uid='$uid'");
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    #
    # Check password in the database against provided. 
    #
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    do {
      if ($row = mysql_fetch_array($user_result)) {
        $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;
	}
	
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        $encoding = crypt("$password", $db_encoding);
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        if (strcmp($encoding, $db_encoding)) {
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	    #
	    # 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;
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        }
        #
        # 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. 
        #
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	$timeout = $now + $TBAUTHTIMEOUT;
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	$hashkey = GENHASH();
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        $query_result =
	    DBQueryFatal("SELECT timeout FROM login WHERE uid='$uid'");
	
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	if (mysql_num_rows($query_result)) {
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	    DBQueryFatal("UPDATE login set ".
			 "timeout='$timeout', hashkey='$hashkey' ".
			 "WHERE uid='$uid'");
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	}
	else {
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	    DBQueryFatal("INSERT into login (uid, hashkey, timeout) ".
			 "VALUES ('$uid', '$hashkey', '$timeout')");
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	}

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	#
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	# Usage stats. 
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	#
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	DBQueryFatal("update user_stats set ".
		     " weblogin_count=weblogin_count+1, ".
		     " weblogin_last=now() ".
		     "where uid='$uid'");
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	#
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	# Issue the cookie requests so that subsequent pages come back
	# with the hash value and auth usr embedded.

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

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	#
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	# 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. 
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	#
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	$adminoff = 1;
	if ($adminmode && $isadmin) {
	    $adminoff = 0;
	}
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	DBQueryFatal("update users set adminoff=$adminoff, ".
		     "       weblogin_failcount=0,weblogin_failstamp=0 ".
		     "where uid='$uid'");
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	return 0;
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      }
    } while (0);
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    #
    # No such user
    #
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    if (!isset($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".
	       "failures from $IP. Last attempted uid was '$uid'.\n\n",
	       "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'");
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    return -1;
}

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#
# 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];
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        $encoding = crypt("$password", $db_encoding);
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        if (strcmp($encoding, $db_encoding)) {
            return -1;
	}
	return 0;
    }
    return -1;
}

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#
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# Log out a UID.
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#
function DOLOGOUT($uid) {
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    global $TBDBNAME, $TBSECURECOOKIES, $CHECKLOGIN_STATUS;
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    # Pedantic check.
    if (!TBvalid_uid($uid)) {
	return 1;
    }

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    $CHECKLOGIN_STATUS = CHECKLOGIN_NOTLOGGEDIN;

    $query_result =
	DBQueryFatal("SELECT hashkey timeout FROM login WHERE uid='$uid'");
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    # Not logged in.
    if (($row = mysql_fetch_array($query_result)) == 0) {
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	return 1;
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    }

    $hashkey = $row[hashkey];
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    $timeout = time() - 1000000;
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    DBQueryFatal("DELETE FROM login WHERE uid='$uid'");
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    #
    # Issue a cookie request to delete the cookie. 
    #
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    setcookie($TBAUTHCOOKIE, "", $timeout, "/", $TBAUTHDOMAIN, 0);
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    return 0;
}

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#
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# Simple "nologins" support.
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#
function NOLOGINS() {
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    global $CHECKLOGIN_NOLOGINS;
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    if ($CHECKLOGIN_NOLOGINS == -1) {
	$CHECKLOGIN_NOLOGINS = TBGetSiteVar("web/nologins");
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    }
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    return $CHECKLOGIN_NOLOGINS;
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}

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function LASTWEBLOGIN($uid) {
    global $TBDBNAME;

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    $query_result =
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        DBQueryFatal("SELECT weblogin_last from user_stats where uid='$uid'");
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    if (mysql_num_rows($query_result)) {
	$lastrow      = mysql_fetch_array($query_result);
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	return $lastrow[weblogin_last];
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    }
    return 0;
}

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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];

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    if ($webonly ||
	(strcmp($status, TBDB_USERSTATUS_ACTIVE) &&
	 strcmp($status, TBDB_USERSTATUS_FROZEN))) {
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	return 0;
    }
    return 1;
}

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#
# Beware empty spaces (cookies)!
# 
?>