acctfuncs.inc.php 30.3 KB
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<?php
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/**
 * Determine if an HTTP request variable is set
 *
 * @param string $name The request variable to test for
 *
 * @return string Return the value of the request variable, otherwise blank
 */
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function in_request($name) {
	if (isset($_REQUEST[$name])) {
		return $_REQUEST[$name];
	}
	return "";
}

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/**
 * Format the PGP key fingerprint
 *
 * @param string $fingerprint An unformatted PGP key fingerprint
 *
 * @return string PGP fingerprint with spaces every 4 characters
 */
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function html_format_pgp_fingerprint($fingerprint) {
	if (strlen($fingerprint) != 40 || !ctype_xdigit($fingerprint)) {
		return $fingerprint;
	}

	return htmlspecialchars(substr($fingerprint, 0, 4) . " " .
		substr($fingerprint, 4, 4) . " " .
		substr($fingerprint, 8, 4) . " " .
		substr($fingerprint, 12, 4) . " " .
		substr($fingerprint, 16, 4) . "  " .
		substr($fingerprint, 20, 4) . " " .
		substr($fingerprint, 24, 4) . " " .
		substr($fingerprint, 28, 4) . " " .
		substr($fingerprint, 32, 4) . " " .
		substr($fingerprint, 36, 4) . " ", ENT_QUOTES);
}

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/**
 * Loads the account editing form, with any values that are already saved
 *
 * @global array $SUPPORTED_LANGS Languages that are supported by the AUR
 * @param string $A Form to use, either UpdateAccount or NewAccount
 * @param string $U The username to display
 * @param string $T The account type of the displayed user
 * @param string $S Whether the displayed user has a suspended account
 * @param string $E The e-mail address of the displayed user
 * @param string $P The password value of the displayed user
 * @param string $C The confirmed password value of the displayed user
 * @param string $R The real name of the displayed user
 * @param string $L The language preference of the displayed user
 * @param string $I The IRC nickname of the displayed user
 * @param string $K The PGP key fingerprint of the displayed user
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 * @param string $J The inactivity status of the displayed user
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 * @param string $UID The user ID of the displayed user
 *
 * @return void
 */
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function display_account_form($A,$U="",$T="",$S="",
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		$E="",$P="",$C="",$R="",$L="",$I="",$K="",$J="", $UID=0) {
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	global $SUPPORTED_LANGS;

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	include("account_edit_form.php");
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	return;
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}
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/**
 * Process information given to new/edit account form
 *
 * @global array $SUPPORTED_LANGS Languages that are supported by the AUR
 * @param string $TYPE Either "edit" for editing or "new" for registering an account
 * @param string $A Form to use, either UpdateAccount or NewAccount
 * @param string $U The username for the account
 * @param string $T The account type for the user
 * @param string $S Whether or not the account is suspended
 * @param string $E The e-mail address for the user
 * @param string $P The password for the user
 * @param string $C The confirmed password for the user
 * @param string $R The real name of the user
 * @param string $L The language preference of the user
 * @param string $I The IRC nickname of the user
 * @param string $K The PGP fingerprint of the user
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 * @param string $J The inactivity status of the user
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 * @param string $UID The user ID of the modified account
 *
 * @return string|void Return void if successful, otherwise return error
 */
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function process_account_form($TYPE,$A,$U="",$T="",$S="",$E="",
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			$P="",$C="",$R="",$L="",$I="",$K="",$J="",$UID=0) {
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	global $SUPPORTED_LANGS, $AUR_LOCATION;
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	$error = '';

	if (is_ipbanned()) {
		$error = __('Account registration has been disabled ' .
					'for your IP address, probably due ' .
					'to sustained spam attacks. Sorry for the ' .
					'inconvenience.');
	}

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	$dbh = DB::connect();
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	if(isset($_COOKIE['AURSID'])) {
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		$editor_user = uid_from_sid($_COOKIE['AURSID']);
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	}
	else {
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		$editor_user = null;
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	}
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	if (empty($E) || empty($U)) {
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		$error = __("Missing a required field.");
	}
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	if ($TYPE != "new" && !$UID) {
		$error = __("Missing User ID");
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	}
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	if (!$error && !valid_username($U)) {
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		$error = __("The username is invalid.") . "<ul>\n"
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			."<li>" . __("It must be between %s and %s characters long",
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			USERNAME_MIN_LEN,  USERNAME_MAX_LEN )
			. "</li>"
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			. "<li>" . __("Start and end with a letter or number") . "</li>"
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			. "<li>" . __("Can contain only one period, underscore or hyphen.")
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			. "</li>\n</ul>";
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	}
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	if (!$error && $P && $C && ($P != $C)) {
		$error = __("Password fields do not match.");
	}
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	if (!$error && $P != '' && !good_passwd($P))
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		$error = __("Your password must be at least %s characters.",PASSWD_MIN_LEN);
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	if (!$error && !valid_email($E)) {
		$error = __("The email address is invalid.");
	}
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	if (!$error && $K != '' && !valid_pgp_fingerprint($K)) {
		$error = __("The PGP key fingerprint is invalid.");
	}

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	$atype = account_from_sid($_COOKIE['AURSID']);
	if (($atype == "User" && $T > 1) || ($atype == "Trusted User" && $T > 2)) {
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		$error = __("Cannot increase account permissions.");
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	}
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	if (!$error && !array_key_exists($L, $SUPPORTED_LANGS)) {
		$error = __("Language is not currently supported.");
	}
	if (!$error) {
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		/*
		 * Check whether the user name is available.
		 * TODO: Fix race condition.
		 */
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		$q = "SELECT COUNT(*) AS CNT FROM Users ";
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		$q.= "WHERE Username = " . $dbh->quote($U);
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		if ($TYPE == "edit") {
			$q.= " AND ID != ".intval($UID);
		}
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		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);

		if ($row[0]) {
			$error = __("The username, %s%s%s, is already in use.",
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				"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
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		}
	}
	if (!$error) {
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		/*
		 * Check whether the e-mail address is available.
		 * TODO: Fix race condition.
		 */
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		$q = "SELECT COUNT(*) AS CNT FROM Users ";
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		$q.= "WHERE Email = " . $dbh->quote($E);
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		if ($TYPE == "edit") {
			$q.= " AND ID != ".intval($UID);
		}
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		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);

		if ($row[0]) {
			$error = __("The address, %s%s%s, is already in use.",
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					"<strong>", htmlspecialchars($E,ENT_QUOTES), "</strong>");
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		}
	}
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	if ($error) {
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		print "<ul class='errorlist'><li>".$error."</li></ul>\n";
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		display_account_form($A, $U, $T, $S, $E, "", "",
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				$R, $L, $I, $K, $J, $UID);
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		return;
	}

	if ($TYPE == "new") {
		/* Create an unprivileged user. */
		$salt = generate_salt();
		if (empty($P)) {
			$send_resetkey = true;
			$email = $E;
		} else {
			$send_resetkey = false;
			$P = salted_hash($P, $salt);
		}
		$U = $dbh->quote($U);
		$E = $dbh->quote($E);
		$P = $dbh->quote($P);
		$salt = $dbh->quote($salt);
		$R = $dbh->quote($R);
		$L = $dbh->quote($L);
		$I = $dbh->quote($I);
		$K = $dbh->quote(str_replace(" ", "", $K));
		$q = "INSERT INTO Users (AccountTypeID, Suspended, ";
		$q.= "InactivityTS, Username, Email, Passwd, Salt, ";
		$q.= "RealName, LangPreference, IRCNick, PGPKey) ";
		$q.= "VALUES (1, 0, 0, $U, $E, $P, $salt, $R, $L, ";
		$q.= "$I, $K)";
		$result = $dbh->exec($q);
		if (!$result) {
			print __("Error trying to create account, %s%s%s.",
					"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
			return;
		}

		print __("The account, %s%s%s, has been successfully created.",
				"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
		print "<p>\n";

		if (!$send_resetkey) {
			print __("Click on the Login link above to use your account.");
			print "</p>\n";
			return;
		}

		$subject = 'Welcome to the Arch User Repository';
		$body = __('Welcome to %s! In order ' .
			'to set an initial password ' .
			'for your new account, ' .
			'please click the link ' .
			'below. If the link does ' .
			'not work try copying and ' .
			'pasting it into your ' .
			'browser.',
			$AUR_LOCATION);
		send_resetkey($email, $subject, $body);

		print __("A password reset key has been sent to your e-mail address.");
		print "</p>\n";
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	} else {
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		/* Modify an existing account. */
		$q = "SELECT InactivityTS FROM Users WHERE ";
		$q.= "ID = " . intval($UID);
		$result = $dbh->query($q);
		$row = $result->fetch(PDO::FETCH_NUM);
		if ($row[0] && $J) {
			$inactivity_ts = $row[0];
		} elseif ($J) {
			$inactivity_ts = time();
		} else {
			$inactivity_ts = 0;
		}
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		$q = "UPDATE Users SET ";
		$q.= "Username = " . $dbh->quote($U);
		if ($T) {
			$q.= ", AccountTypeID = ".intval($T);
		}
		if ($S) {
			/* Ensure suspended users can't keep an active session */
			delete_user_sessions($UID);
			$q.= ", Suspended = 1";
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		} else {
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			$q.= ", Suspended = 0";
		}
		$q.= ", Email = " . $dbh->quote($E);
		if ($P) {
			$salt = generate_salt();
			$hash = salted_hash($P, $salt);
			$q .= ", Passwd = '$hash', Salt = '$salt'";
		}
		$q.= ", RealName = " . $dbh->quote($R);
		$q.= ", LangPreference = " . $dbh->quote($L);
		$q.= ", IRCNick = " . $dbh->quote($I);
		$q.= ", PGPKey = " . $dbh->quote(str_replace(" ", "", $K));
		$q.= ", InactivityTS = " . $inactivity_ts;
		$q.= " WHERE ID = ".intval($UID);
		$result = $dbh->exec($q);
		if (!$result) {
			print __("No changes were made to the account, %s%s%s.",
					"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
		} else {
			print __("The account, %s%s%s, has been successfully modified.",
					"<strong>", htmlspecialchars($U,ENT_QUOTES), "</strong>");
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		}
	}
}

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/**
 * Display the search results page
 *
 * @param string $O The offset for the results page
 * @param string $SB The column to sort the results page by
 * @param string $U The username search criteria
 * @param string $T The account type search criteria
 * @param string $S Whether the account is suspended search criteria
 * @param string $E The e-mail address search criteria
 * @param string $R The real name search criteria
 * @param string $I The IRC nickname search criteria
 * @param string $K The PGP key fingerprint search criteria
 *
 * @return void
 */
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function search_results_page($O=0,$SB="",$U="",$T="",
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		$S="",$E="",$R="",$I="",$K="") {
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	$HITS_PER_PAGE = 50;
	if ($O) {
		$OFFSET = intval($O);
	} else {
		$OFFSET = 0;
	}
	if ($OFFSET < 0) {
		$OFFSET = 0;
	}
	$search_vars = array();

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	$dbh = DB::connect();
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	$q = "SELECT Users.*, AccountTypes.AccountType ";
	$q.= "FROM Users, AccountTypes ";
	$q.= "WHERE AccountTypes.ID = Users.AccountTypeID ";
	if ($T == "u") {
		$q.= "AND AccountTypes.ID = 1 ";
		$search_vars[] = "T";
	} elseif ($T == "t") {
		$q.= "AND AccountTypes.ID = 2 ";
		$search_vars[] = "T";
	} elseif ($T == "d") {
		$q.= "AND AccountTypes.ID = 3 ";
		$search_vars[] = "T";
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	} elseif ($T == "td") {
		$q.= "AND AccountTypes.ID = 4 ";
		$search_vars[] = "T";
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	}
	if ($S) {
		$q.= "AND Users.Suspended = 1 ";
		$search_vars[] = "S";
	}
	if ($U) {
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		$U = "%" . addcslashes($U, '%_') . "%";
		$q.= "AND Username LIKE " . $dbh->quote($U) . " ";
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		$search_vars[] = "U";
	}
	if ($E) {
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		$E = "%" . addcslashes($E, '%_') . "%";
		$q.= "AND Email LIKE " . $dbh->quote($E) . " ";
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		$search_vars[] = "E";
	}
	if ($R) {
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		$R = "%" . addcslashes($R, '%_') . "%";
		$q.= "AND RealName LIKE " . $dbh->quote($R) . " ";
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		$search_vars[] = "R";
	}
	if ($I) {
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		$I = "%" . addcslashes($I, '%_') . "%";
		$q.= "AND IRCNick LIKE " . $dbh->quote($I) . " ";
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		$search_vars[] = "I";
	}
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	if ($K) {
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		$K = "%" . addcslashes(str_replace(" ", "", $K), '%_') . "%";
		$q.= "AND PGPKey LIKE " . $dbh->quote($K) . " ";
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		$search_vars[] = "K";
	}
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	switch ($SB) {
		case 't':
			$q.= "ORDER BY AccountTypeID, Username ";
			break;
		case 'r':
			$q.= "ORDER BY RealName, AccountTypeID ";
			break;
		case 'i':
			$q.= "ORDER BY IRCNick, AccountTypeID ";
			break;
		default:
			$q.= "ORDER BY Username, AccountTypeID ";
			break;
	}
	$search_vars[] = "SB";
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	$q.= "LIMIT " . $HITS_PER_PAGE . " OFFSET " . $OFFSET;
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	$dbh = DB::connect();
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	$result = $dbh->query($q);
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	while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
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		$userinfo[] = $row;
	}

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	include("account_search_results.php");
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	return;
}

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/**
 * Attempt to login and generate a session
 *
 * @global int $MAX_SESSIONS_PER_USER Maximum sessions a single user may have open
 * @global int $PERSISTENT_COOKIE_TIMEOUT Time until cookie expires
 *
 * @return array Session ID for user, error message if applicable
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 */
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function try_login() {
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	global $MAX_SESSIONS_PER_USER, $PERSISTENT_COOKIE_TIMEOUT;
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	$login_error = "";
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	$new_sid = "";
	$userID = null;

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	if (!isset($_REQUEST['user']) && !isset($_REQUEST['passwd'])) {
		return array('SID' => '', 'error' => null);
	}

	if (is_ipbanned()) {
		$login_error = __('The login form is currently disabled ' .
						'for your IP address, probably due ' .
						'to sustained spam attacks. Sorry for the ' .
						'inconvenience.');
		return array('SID' => '', 'error' => $login_error);
	}
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	$dbh = DB::connect();
	$userID = valid_user($_REQUEST['user']);

	if (user_suspended($userID)) {
		$login_error = __('Account suspended');
		return array('SID' => '', 'error' => $login_error);
	} elseif (passwd_is_empty($userID)) {
		$login_error = __('Your password has been reset. ' .
			'If you just created a new account, please ' .
			'use the link from the confirmation email ' .
			'to set an initial password. Otherwise, ' .
			'please request a reset key on the %s' .
			'Password Reset%s page.', '<a href="' .
			htmlspecialchars(get_uri('/passreset')) . '">',
			'</a>');
		return array('SID' => '', 'error' => $login_error);
	} elseif (!valid_passwd($userID, $_REQUEST['passwd'])) {
		$login_error = __("Bad username or password.");
		return array('SID' => '', 'error' => $login_error);
	}

	$logged_in = 0;
	$num_tries = 0;

	/* Generate a session ID and store it. */
	while (!$logged_in && $num_tries < 5) {
		if ($MAX_SESSIONS_PER_USER) {
			/*
			 * Delete all user sessions except the
			 * last ($MAX_SESSIONS_PER_USER - 1).
			 */
			$q = "DELETE s.* FROM Sessions s ";
			$q.= "LEFT JOIN (SELECT SessionID FROM Sessions ";
			$q.= "WHERE UsersId = " . $userID . " ";
			$q.= "ORDER BY LastUpdateTS DESC ";
			$q.= "LIMIT " . ($MAX_SESSIONS_PER_USER - 1) . ") q ";
			$q.= "ON s.SessionID = q.SessionID ";
			$q.= "WHERE s.UsersId = " . $userID . " ";
			$q.= "AND q.SessionID IS NULL;";
			$dbh->query($q);
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		}
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		$new_sid = new_sid();
		$q = "INSERT INTO Sessions (UsersID, SessionID, LastUpdateTS)"
		  ." VALUES (" . $userID . ", '" . $new_sid . "', UNIX_TIMESTAMP())";
		$result = $dbh->exec($q);

		/* Query will fail if $new_sid is not unique. */
		if ($result) {
			$logged_in = 1;
			break;
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		}
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		$num_tries++;
	}

	if (!$logged_in) {
		$login_error = __('An error occurred trying to generate a user session.');
		return array('SID' => $new_sid, 'error' => $login_error);
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	}
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	$q = "UPDATE Users SET LastLogin = UNIX_TIMESTAMP(), ";
	$q.= "LastLoginIPAddress = " . $dbh->quote(ip2long($_SERVER['REMOTE_ADDR'])) . " ";
	$q.= "WHERE ID = '$userID'";
	$dbh->exec($q);

	/* Set the SID cookie. */
	if (isset($_POST['remember_me']) && $_POST['remember_me'] == "on") {
		/* Set cookies for 30 days. */
		$cookie_time = time() + $PERSISTENT_COOKIE_TIMEOUT;

		/* Set session for 30 days. */
		$q = "UPDATE Sessions SET LastUpdateTS = $cookie_time ";
		$q.= "WHERE SessionID = '$new_sid'";
		$dbh->exec($q);
	} else {
		$cookie_time = 0;
	}

	setcookie("AURSID", $new_sid, $cookie_time, "/", null, !empty($_SERVER['HTTPS']), true);
	header("Location: " . get_uri('/'));
	$login_error = "";
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}

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/**
 * Determine if the user is using a banned IP address
 *
 * @return bool True if IP address is banned, otherwise false
 */
function is_ipbanned() {
	$dbh = DB::connect();

	$q = "SELECT * FROM Bans WHERE IPAddress = " . $dbh->quote(ip2long($_SERVER['REMOTE_ADDR']));
	$result = $dbh->query($q);

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	return ($result->fetchColumn() ? true : false);
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}

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/**
 * Validate a username against a collection of rules
 *
 * The username must be longer or equal to USERNAME_MIN_LEN. It must be shorter
 * or equal to USERNAME_MAX_LEN. It must start and end with either a letter or
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 * a number. It can contain one period, hypen, or underscore. Returns boolean
 * of whether name is valid.
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 *
 * @param string $user Username to validate
 *
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 * @return bool True if username meets criteria, otherwise false
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 */
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function valid_username($user) {
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	if (strlen($user) < USERNAME_MIN_LEN ||
	    strlen($user) > USERNAME_MAX_LEN) {
		return false;
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	} else if (!preg_match("/^[a-z0-9]+[.\-_]?[a-z0-9]+$/i", $user)) {
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		return false;
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	}
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	return true;
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}

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/**
 * Determine if a username exists in the database
 *
 * @param string $user Username to check in the database
 *
 * @return string|void Return user ID if in database, otherwise void
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 */
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function valid_user($user) {
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	if (!$user) {
		return false;
	}
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	$dbh = DB::connect();

	$q = "SELECT ID FROM Users WHERE ";
	$q.= "Username = " . $dbh->quote($user);
	$result = $dbh->query($q);
	if (!$result) {
		return null;
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	}
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	$row = $result->fetch(PDO::FETCH_NUM);
	return $row[0];
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}

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/**
 * Determine if a user already has a proposal open about themselves
 *
 * @param string $user Username to checkout for open proposal
 *
 * @return bool True if there is an open proposal about the user, otherwise false
 */
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function open_user_proposals($user) {
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	$dbh = DB::connect();
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	$q = "SELECT * FROM TU_VoteInfo WHERE User = " . $dbh->quote($user) . " ";
	$q.= "AND End > UNIX_TIMESTAMP()";
	$result = $dbh->query($q);
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	return ($result->fetchColumn() ? true : false);
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}

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/**
 * Add a new Trusted User proposal to the database
 *
 * @param string $agenda The agenda of the vote
 * @param string $user The use the vote is about
 * @param int $votelength The length of time for the vote to last
 * @param string $submitteruid The user ID of the individual who submitted the proposal
 *
 * @return void
 */
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function add_tu_proposal($agenda, $user, $votelength, $quorum, $submitteruid) {
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	$dbh = DB::connect();
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	$q = "SELECT COUNT(*) FROM Users WHERE AccountTypeID = 2";
	$result = $dbh->query($q);
	$row = $result->fetch(PDO::FETCH_NUM);
	$active_tus = $row[0];

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	$q = "INSERT INTO TU_VoteInfo (Agenda, User, Submitted, End, Quorum, ";
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	$q.= "SubmitterID, ActiveTUs) VALUES ";
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	$q.= "(" . $dbh->quote($agenda) . ", " . $dbh->quote($user) . ", ";
	$q.= "UNIX_TIMESTAMP(), UNIX_TIMESTAMP() + " . $dbh->quote($votelength);
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	$q.= ", " . $dbh->quote($quorum) . ", " . $submitteruid . ", ";
	$q.= $active_tus . ")";
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	$result = $dbh->exec($q);
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}

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/**
 * Add a reset key to the database for a specified user
 *
 * @param string $resetkey A password reset key to be stored in database
 * @param string $uid The user ID to store the reset key for
 *
 * @return void
 */
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function create_resetkey($resetkey, $uid) {
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	$dbh = DB::connect();
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	$q = "UPDATE Users ";
	$q.= "SET ResetKey = '" . $resetkey . "' ";
	$q.= "WHERE ID = " . $uid;
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	$dbh->exec($q);
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}

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/**
 * Send a reset key to a specific e-mail address
 *
 * @param string $email E-mail address of the user resetting their password
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 * @param string $subject Subject of the email
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 * @param string $body Body of the email
 *
 * @return void
 */
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function send_resetkey($email, $subject, $body) {
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	global $AUR_LOCATION;

	$uid = uid_from_email($email);
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	if ($uid == null) {
		return;
	}

	/* We (ab)use new_sid() to get a random 32 characters long string. */
	$resetkey = new_sid();
	create_resetkey($resetkey, $uid);

	/* Send e-mail with confirmation link. */
	$body = wordwrap($body, 70);
	$body .=  "\n\n".
		  "{$AUR_LOCATION}/" . get_uri('/passreset/') . "?".
		  "resetkey={$resetkey}";
	$headers = "MIME-Version: 1.0\r\n" .
		   "Content-type: text/plain; charset=UTF-8\r\n" .
		   "Reply-to: noreply@aur.archlinux.org\r\n" .
		   "From: notify@aur.achlinux.org\r\n" .
		   "X-Mailer: PHP\r\n" .
		   "X-MimeOLE: Produced By AUR";
	@mail($email, $subject, $body, $headers);
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}

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/**
 * Change a user's password in the database if reset key and e-mail are correct
 *
 * @param string $hash New MD5 hash of a user's password
 * @param string $salt New salt for the user's password
 * @param string $resetkey Code e-mailed to a user to reset a password
 * @param string $email E-mail address of the user resetting their password
 *
 * @return string|void Redirect page if successful, otherwise return error message
 */
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function password_reset($hash, $salt, $resetkey, $email) {
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	$dbh = DB::connect();
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	$q = "UPDATE Users ";
	$q.= "SET Passwd = '$hash', ";
	$q.= "Salt = '$salt', ";
	$q.= "ResetKey = '' ";
	$q.= "WHERE ResetKey != '' ";
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	$q.= "AND ResetKey = " . $dbh->quote($resetkey) . " ";
	$q.= "AND Email = " . $dbh->quote($email);
	$result = $dbh->exec($q);
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	if (!$result) {
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		$error = __('Invalid e-mail and reset key combination.');
		return $error;
	} else {
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		header('Location: ' . get_uri('/passreset/') . '?step=complete');
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		exit();
	}
}

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/**
 * Determine if the password is longer than the minimum length
 *
 * @param string $passwd The password to check
 *
 * @return bool True if longer than minimum length, otherwise false
 */
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function good_passwd($passwd) {
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	if ( strlen($passwd) >= PASSWD_MIN_LEN ) {
		return true;
	}
	return false;
}

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/**
 * Determine if the password is correct and salt it if it hasn't been already
 *
 * @param string $userID The user ID to check the password against
 * @param string $passwd The password the visitor sent
 *
 * @return bool True if password was correct and properly salted, otherwise false
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 */
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function valid_passwd($userID, $passwd) {
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	$dbh = DB::connect();
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	if ($passwd == "") {
		return false;
	}

	/* Get salt for this user. */
	$salt = get_salt($userID);
	if ($salt) {
		$q = "SELECT ID FROM Users ";
		$q.= "WHERE ID = " . $userID . " ";
		$q.= "AND Passwd = " . $dbh->quote(salted_hash($passwd, $salt));
		$result = $dbh->query($q);
		if (!$result) {
			return false;
		}

		$row = $result->fetch(PDO::FETCH_NUM);
		return ($row[0] > 0);
	} else {
		/* Check password without using salt. */
		$q = "SELECT ID FROM Users ";
		$q.= "WHERE ID = " . $userID . " ";
		$q.= "AND Passwd = " . $dbh->quote(md5($passwd));
		$result = $dbh->query($q);
		if (!$result) {
			return false;
		}

		$row = $result->fetch(PDO::FETCH_NUM);
		if (!$row[0]) {
			return false;
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		}
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		/* Password correct, but salt it first! */
		if (!save_salt($userID, $passwd)) {
			trigger_error("Unable to salt user's password;" .
				" ID " . $userID, E_USER_WARNING);
			return false;
		}

		return true;
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	}
}

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/**
 * Determine if a user's password is empty
 *
 * @param string $uid The user ID to check for an empty password
 *
 * @return bool True if the user's password is empty, otherwise false
 */
function passwd_is_empty($uid) {
	$dbh = DB::connect();

	$q = "SELECT * FROM Users WHERE ID = " . $dbh->quote($uid) . " ";
	$q .= "AND Passwd = " . $dbh->quote('');
	$result = $dbh->query($q);

	if ($result->fetchColumn()) {
		return true;
	} else {
		return false;
	}
}

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/**
 * Determine if the PGP key fingerprint is valid (must be 40 hexadecimal digits)
 *
 * @param string $fingerprint PGP fingerprint to check if valid
 *
 * @return bool True if the fingerprint is 40 hexadecimal digits, otherwise false
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 */
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function valid_pgp_fingerprint($fingerprint) {
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	$fingerprint = str_replace(" ", "", $fingerprint);
	return (strlen($fingerprint) == 40 && ctype_xdigit($fingerprint));
}

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/**
 * Determine if the user account has been suspended
 *
 * @param string $id The ID of user to check if suspended
 *
 * @return bool True if the user is suspended, otherwise false
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 */
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function user_suspended($id) {
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	$dbh = DB::connect();
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	if (!$id) {
		return false;
	}
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	$q = "SELECT Suspended FROM Users WHERE ID = " . $id;
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	$result = $dbh->query($q);
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	if ($result) {
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		$row = $result->fetch(PDO::FETCH_NUM);
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		if ($row[0]) {
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			return true;
		}
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	}
	return false;
}

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/**
 * Delete a specified user account from the database
 *
 * @param int $id The user ID of the account to be deleted
 *
 * @return void
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 */
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function user_delete($id) {
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	$dbh = DB::connect();
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	$id = intval($id);

	/*
	 * These are normally already taken care of by propagation constraints
	 * but it is better to be explicit here.
	 */
	$fields_delete = array(
		array("Sessions", "UsersID"),
		array("PackageVotes", "UsersID"),
		array("CommentNotify", "UsersID")
	);

	$fields_set_null = array(
		array("PackageBases", "SubmitterUID"),
		array("PackageBases", "MaintainerUID"),
		array("PackageBases", "SubmitterUID"),
		array("PackageComments", "UsersID"),
		array("PackageComments", "DelUsersID"),
		array("PackageRequests", "UsersID"),
		array("TU_VoteInfo", "SubmitterID"),
		array("TU_Votes", "UserID")
	);

	foreach($fields_delete as list($table, $field)) {
		$q = "DELETE FROM " . $table . " ";
		$q.= "WHERE " . $field . " = " . $id;
		$dbh->query($q);
	}

	foreach($fields_set_null as list($table, $field)) {
		$q = "UPDATE " . $table . " SET " . $field . " = NULL ";
		$q.= "WHERE " . $field . " = " . $id;
		$dbh->query($q);
	}

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	$q = "DELETE FROM Users WHERE ID = " . $id;
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	$dbh->query($q);
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	return;
}

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/**
 * Remove the session from the database on logout
 *
 * @param string $sid User's session ID
 *
 * @return void
 */
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function delete_session_id($sid) {
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	$dbh = DB::connect();
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	$q = "DELETE FROM Sessions WHERE SessionID = " . $dbh->quote($sid);
	$dbh->query($q);
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}

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/**
 * Remove all sessions belonging to a particular user
 *
 * @param int $uid ID of user to remove all sessions for
 *
 * @return void
 */
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function delete_user_sessions($uid) {
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	$dbh = DB::connect();
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	$q = "DELETE FROM Sessions WHERE UsersID = " . intval($uid);
	$dbh->exec($q);
}

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/**
 * Remove sessions from the database that have exceed the timeout
 *
 * @global int $LOGIN_TIMEOUT Time until session expires
 *
 * @return void
 */
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function clear_expired_sessions() {
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	global $LOGIN_TIMEOUT;

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	$dbh = DB::connect();
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	$q = "DELETE FROM Sessions WHERE LastUpdateTS < (UNIX_TIMESTAMP() - $LOGIN_TIMEOUT)";
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	$dbh->query($q);
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	return;
}
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/**
 * Get account details for a specific user
 *
 * @param string $uid The User ID of account to get information for
 * @param string $username The username of the account to get for
 *
 * @return array Account details for the specified user
 */
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function account_details($uid, $username) {
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	$dbh = DB::connect();
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	$q = "SELECT Users.*, AccountTypes.AccountType ";
	$q.= "FROM Users, AccountTypes ";
	$q.= "WHERE AccountTypes.ID = Users.AccountTypeID ";
	if (!empty($uid)) {
		$q.= "AND Users.ID = ".intval($uid);
	} else {
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		$q.= "AND Users.Username = " . $dbh->quote($username);
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	}
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	$result = $dbh->query($q);
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	if ($result) {
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		$row = $result->fetch(PDO::FETCH_ASSOC);
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	}

	return $row;
}

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/**
 * Determine if a user has already voted on a specific proposal
 *
 * @param string $voteid The ID of the Trusted User proposal
 * @param string $uid The ID to check if the user already voted
 *
 * @return bool True if the user has already voted, otherwise false
 */
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function tu_voted($voteid, $uid) {
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	$dbh = DB::connect();
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	$q = "SELECT COUNT(*) FROM TU_Votes ";
	$q.= "WHERE VoteID = " . intval($voteid) . " AND UserID = " . intval($uid);
	$result = $dbh->query($q);
	if ($result->fetchColumn() > 0) {
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		return true;
	}
	else {
		return false;
	}
}

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/**
 * Get all current Trusted User proposals from the database
 *
 * @param string $order Ascending or descending order for the proposal listing
 *
 * @return array The details for all current Trusted User proposals
 */
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function current_proposal_list($order) {
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	$dbh = DB::connect();
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	$q = "SELECT * FROM TU_VoteInfo WHERE End > " . time() . " ORDER BY Submitted " . $order;
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	$result = $dbh->query($q);
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	$details = array();
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	while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
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		$details[] = $row;
	}

	return $details;
}

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/**
 * Get a subset of all past Trusted User proposals from the database
 *
 * @param string $order Ascending or descending order for the proposal listing
 * @param string $lim The number of proposals to list with the offset
 *
 * @return array The details for the subset of past Trusted User proposals
 */
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function past_proposal_list($order, $lim) {
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	$dbh = DB::connect();
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	$q = "SELECT * FROM TU_VoteInfo WHERE End < " . time() . " ORDER BY Submitted " . $order . $lim;
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	$result = $dbh->query($q);
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