Allow for resetting the SSH public key

[aur.git] / web / lib / acctfuncs.inc.php

<?php

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

/**
 * Format the PGP key fingerprint
 *
 * @param string $fingerprint An unformatted PGP key fingerprint
 *
 * @return string PGP fingerprint with spaces every 4 characters
 */
function html_format_pgp_fingerprint($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);
}

/**
 * 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
 * @param string $PK The SSH public key of the displayed user
 * @param string $J The inactivity status of the displayed user
 * @param string $UID The user ID of the displayed user
 *
 * @return void
 */
function display_account_form($A,$U="",$T="",$S="",$E="",$P="",$C="",$R="",
                $L="",$I="",$K="",$PK="",$J="", $UID=0) {
        global $SUPPORTED_LANGS;

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

/**
 * 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
 * @param string $PK The SSH public key of the user
 * @param string $J The inactivity status of the user
 * @param string $UID The user ID of the modified account
 *
 * @return string|void Return void if successful, otherwise return error
 */
function process_account_form($TYPE,$A,$U="",$T="",$S="",$E="",$P="",$C="",
                $R="",$L="",$I="",$K="",$PK="",$J="",$UID=0) {
        global $SUPPORTED_LANGS;

        $error = '';

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

        $dbh = DB::connect();

        if(isset($_COOKIE['AURSID'])) {
                $editor_user = uid_from_sid($_COOKIE['AURSID']);
        }
        else {
                $editor_user = null;
        }

        if (empty($E) || empty($U)) {
                $error = __("Missing a required field.");
        }

        if ($TYPE != "new" && !$UID) {
                $error = __("Missing User ID");
        }

        if (!$error && !valid_username($U)) {
                $length_min = config_get_int('options', 'username_min_len');
                $length_max = config_get_int('options', 'username_max_len');

                $error = __("The username is invalid.") . "<ul>\n"
                        . "<li>" . __("It must be between %s and %s characters long", $length_min, $length_max)
                        . "</li>"
                        . "<li>" . __("Start and end with a letter or number") . "</li>"
                        . "<li>" . __("Can contain only one period, underscore or hyphen.")
                        . "</li>\n</ul>";
        }

        if (!$error && $P && $C && ($P != $C)) {
                $error = __("Password fields do not match.");
        }
        if (!$error && $P != '' && !good_passwd($P)) {
                $length_min = config_get_int('options', 'passwd_min_len');
                $error = __("Your password must be at least %s characters.",
                        $length_min);
        }

        if (!$error && !valid_email($E)) {
                $error = __("The email address is invalid.");
        }

        if (!$error && $K != '' && !valid_pgp_fingerprint($K)) {
                $error = __("The PGP key fingerprint is invalid.");
        }

        if (!$error && !empty($PK)) {
                if (valid_ssh_pubkey($PK)) {
                        $tokens = explode(" ", $PK);
                        $PK = $tokens[0] . " " . $tokens[1];
                } else {
                        $error = __("The SSH public key is invalid.");
                }
        }

        if (isset($_COOKIE['AURSID'])) {
                $atype = account_from_sid($_COOKIE['AURSID']);
                if (($atype == "User" && $T > 1) || ($atype == "Trusted User" && $T > 2)) {
                        $error = __("Cannot increase account permissions.");
                }
        }

        if (!$error && !array_key_exists($L, $SUPPORTED_LANGS)) {
                $error = __("Language is not currently supported.");
        }
        if (!$error) {
                /*
                 * Check whether the user name is available.
                 * TODO: Fix race condition.
                 */
                $q = "SELECT COUNT(*) AS CNT FROM Users ";
                $q.= "WHERE Username = " . $dbh->quote($U);
                if ($TYPE == "edit") {
                        $q.= " AND ID != ".intval($UID);
                }
                $result = $dbh->query($q);
                $row = $result->fetch(PDO::FETCH_NUM);

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

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

                if ($row[0]) {
                        $error = __("The SSH public key, %s%s%s, is already in use.",
                                        "<strong>", htmlspecialchars($PK, ENT_QUOTES), "</strong>");
                }
        }

        if ($error) {
                print "<ul class='errorlist'><li>".$error."</li></ul>\n";
                display_account_form($A, $U, $T, $S, $E, "", "",
                                $R, $L, $I, $K, $PK, $J, $UID);
                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));
                $PK = empty($PK) ? "NULL" : $dbh->quote($PK);
                $q = "INSERT INTO Users (AccountTypeID, Suspended, ";
                $q.= "InactivityTS, Username, Email, Passwd, Salt, ";
                $q.= "RealName, LangPreference, IRCNick, PGPKey, ";
                $q.= "SSHPubKey) ";
                $q.= "VALUES (1, 0, 0, $U, $E, $P, $salt, $R, $L, ";
                $q.= "$I, $K, $PK)";
                $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";
        } else {
                /* 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;
                }

                $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";
                } else {
                        $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.= ", SSHPubKey = " . $dbh->quote($PK);
                $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>");
                }
        }
}

/**
 * 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 $K The PGP key fingerprint search criteria
 *
 * @return void
 */
function search_results_page($O=0,$SB="",$U="",$T="",
                $S="",$E="",$R="",$I="",$K="") {

        $HITS_PER_PAGE = 50;
        if ($O) {
                $OFFSET = intval($O);
        } else {
                $OFFSET = 0;
        }
        if ($OFFSET < 0) {
                $OFFSET = 0;
        }
        $search_vars = array();

        $dbh = DB::connect();

        $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 ";
                $search_vars[] = "T";
        } elseif ($T == "td") {
                $q.= "AND AccountTypes.ID = 4 ";
                $search_vars[] = "T";
        }
        if ($S) {
                $q.= "AND Users.Suspended = 1 ";
                $search_vars[] = "S";
        }
        if ($U) {
                $U = "%" . addcslashes($U, '%_') . "%";
                $q.= "AND Username LIKE " . $dbh->quote($U) . " ";
                $search_vars[] = "U";
        }
        if ($E) {
                $E = "%" . addcslashes($E, '%_') . "%";
                $q.= "AND Email LIKE " . $dbh->quote($E) . " ";
                $search_vars[] = "E";
        }
        if ($R) {
                $R = "%" . addcslashes($R, '%_') . "%";
                $q.= "AND RealName LIKE " . $dbh->quote($R) . " ";
                $search_vars[] = "R";
        }
        if ($I) {
                $I = "%" . addcslashes($I, '%_') . "%";
                $q.= "AND IRCNick LIKE " . $dbh->quote($I) . " ";
                $search_vars[] = "I";
        }
        if ($K) {
                $K = "%" . addcslashes(str_replace(" ", "", $K), '%_') . "%";
                $q.= "AND PGPKey LIKE " . $dbh->quote($K) . " ";
                $search_vars[] = "K";
        }
        switch ($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";
        $q.= "LIMIT " . $HITS_PER_PAGE . " OFFSET " . $OFFSET;

        $dbh = DB::connect();

        $result = $dbh->query($q);

        while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
                $userinfo[] = $row;
        }

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

/**
 * Attempt to login and generate a session
 *
 * @return array Session ID for user, error message if applicable
 */
function try_login() {
        $login_error = "";
        $new_sid = "";
        $userID = null;

        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);
        }

        $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) {
                $session_limit = config_get_int('options', 'max_sessions_per_user');
                if ($session_limit) {
                        /*
                         * Delete all user sessions except the
                         * last ($session_limit - 1).
                         */
                        $q = "DELETE s.* FROM Sessions s ";
                        $q.= "LEFT JOIN (SELECT SessionID FROM Sessions ";
                        $q.= "WHERE UsersId = " . $userID . " ";
                        $q.= "ORDER BY LastUpdateTS DESC ";
                        $q.= "LIMIT " . ($session_limit - 1) . ") q ";
                        $q.= "ON s.SessionID = q.SessionID ";
                        $q.= "WHERE s.UsersId = " . $userID . " ";
                        $q.= "AND q.SessionID IS NULL;";
                        $dbh->query($q);
                }

                $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;
                }

                $num_tries++;
        }

        if (!$logged_in) {
                $login_error = __('An error occurred trying to generate a user session.');
                return array('SID' => $new_sid, 'error' => $login_error);
        }

        $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. */
                $timeout = config_get_int('options', 'persistent_cookie_timeout');
                $cookie_time = time() + $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 = "";
}

/**
 * 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);

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

/**
 * Validate a username against a collection of rules
 *
 * The username must be longer or equal to the configured minimum length. It
 * must be shorter or equal to the configured maximum length. It must start and
 * end with either a letter or a number. It can contain one period, hypen, or
 * underscore. Returns boolean of whether name is valid.
 *
 * @param string $user Username to validate
 *
 * @return bool True if username meets criteria, otherwise false
 */
function valid_username($user) {
        $length_min = config_get_int('options', 'username_min_len');
        $length_max = config_get_int('options', 'username_max_len');

        if (strlen($user) < $length_min || strlen($user) > $length_max) {
                return false;
        } else if (!preg_match("/^[a-z0-9]+[.\-_]?[a-z0-9]+$/Di", $user)) {
                return false;
        }

        return true;
}

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

        $dbh = DB::connect();

        $q = "SELECT ID FROM Users WHERE ";
        $q.= "Username = " . $dbh->quote($user);
        $result = $dbh->query($q);
        if (!$result) {
                return null;
        }

        $row = $result->fetch(PDO::FETCH_NUM);
        return $row[0];
}

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

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

/**
 * 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 $submitteruid The user ID of the individual who submitted the proposal
 *
 * @return void
 */
function add_tu_proposal($agenda, $user, $votelength, $quorum, $submitteruid) {
        $dbh = DB::connect();

        $q = "SELECT COUNT(*) FROM Users WHERE (AccountTypeID = 2 OR AccountTypeID = 4)";
        $result = $dbh->query($q);
        $row = $result->fetch(PDO::FETCH_NUM);
        $active_tus = $row[0];

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

/**
 * 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 $uid The user ID to store the reset key for
 *
 * @return void
 */
function create_resetkey($resetkey, $uid) {
        $dbh = DB::connect();
        $q = "UPDATE Users ";
        $q.= "SET ResetKey = '" . $resetkey . "' ";
        $q.= "WHERE ID = " . $uid;
        $dbh->exec($q);
}

/**
 * Send a reset key to a specific e-mail address
 *
 * @param string $email E-mail address of the user resetting their password
 * @param string $subject Subject of the email
 * @param string $body Body of the email
 *
 * @return void
 */
function send_resetkey($email, $subject, $body) {
        $uid = uid_from_email($email);
        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);
        $body .=  "\n\n". get_uri('/passreset/', true) .
                  "?resetkey={$resetkey}";
        $headers = "MIME-Version: 1.0\r\n" .
                   "Content-type: text/plain; charset=UTF-8\r\n" .
                   "Reply-to: noreply@aur.archlinux.org\r\n" .
                   "From: notify@aur.archlinux.org\r\n" .
                   "X-Mailer: PHP\r\n" .
                   "X-MimeOLE: Produced By AUR";
        @mail($email, $subject, $body, $headers);
}

/**
 * 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 $email E-mail address of the user resetting their password
 *
 * @return string|void Redirect page if successful, otherwise return error message
 */
function password_reset($hash, $salt, $resetkey, $email) {
        $dbh = DB::connect();
        $q = "UPDATE Users ";
        $q.= "SET Passwd = '$hash', ";
        $q.= "Salt = '$salt', ";
        $q.= "ResetKey = '' ";
        $q.= "WHERE ResetKey != '' ";
        $q.= "AND ResetKey = " . $dbh->quote($resetkey) . " ";
        $q.= "AND Email = " . $dbh->quote($email);
        $result = $dbh->exec($q);

        if (!$result) {
                $error = __('Invalid e-mail and reset key combination.');
                return $error;
        } else {
                header('Location: ' . get_uri('/passreset/') . '?step=complete');
                exit();
        }
}

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

/**
 * 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 $passwd The password the visitor sent
 *
 * @return bool True if password was correct and properly salted, otherwise false
 */
function valid_passwd($userID, $passwd) {
        $dbh = DB::connect();
        if ($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;
                }

                /* 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;
        }
}

/**
 * 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;
        }
}

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

/**
 * Determine if the SSH public key is valid
 *
 * @param string $pubkey SSH public key to check
 *
 * @return bool True if the SSH public key is valid, otherwise false
 */
function valid_ssh_pubkey($pubkey) {
        $valid_prefixes = array(
                "ssh-rsa", "ssh-dss", "ecdsa-sha2-nistp256",
                "ecdsa-sha2-nistp384", "ecdsa-sha2-nistp521", "ssh-ed25519"
        );

        $has_valid_prefix = false;
        foreach ($valid_prefixes as $prefix) {
                if (strpos($pubkey, $prefix . " ") === 0) {
                        $has_valid_prefix = true;
                        break;
                }
        }
        if (!$has_valid_prefix) {
                return false;
        }

        $tokens = explode(" ", $pubkey);
        if (empty($tokens[1])) {
                return false;
        }

        return (base64_encode(base64_decode($tokens[1], true)) == $tokens[1]);
}

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

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

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

/**
 * Remove the session from the database on logout
 *
 * @param string $sid User's session ID
 *
 * @return void
 */
function delete_session_id($sid) {
        $dbh = DB::connect();

        $q = "DELETE FROM Sessions WHERE SessionID = " . $dbh->quote($sid);
        $dbh->query($q);
}

/**
 * Remove all sessions belonging to a particular user
 *
 * @param int $uid ID of user to remove all sessions for
 *
 * @return void
 */
function delete_user_sessions($uid) {
        $dbh = DB::connect();

        $q = "DELETE FROM Sessions WHERE UsersID = " . intval($uid);
        $dbh->exec($q);
}

/**
 * Remove sessions from the database that have exceed the timeout
 *
 * @return void
 */
function clear_expired_sessions() {
        $dbh = DB::connect();

        $timeout = config_get_int('options', 'login_timeout');
        $q = "DELETE FROM Sessions WHERE LastUpdateTS < (UNIX_TIMESTAMP() - " . $timeout . ")";
        $dbh->query($q);

        return;
}

/**
 * Get account details for a specific user
 *
 * @param string $uid The User ID of account to get information for
 * @param string $username The username of the account to get for
 *
 * @return array Account details for the specified user
 */
function account_details($uid, $username) {
        $dbh = DB::connect();
        $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 {
                $q.= "AND Users.Username = " . $dbh->quote($username);
        }
        $result = $dbh->query($q);

        if ($result) {
                $row = $result->fetch(PDO::FETCH_ASSOC);
        }

        return $row;
}

/**
 * Determine if a user has already voted on a specific proposal
 *
 * @param string $voteid The ID of the Trusted User proposal
 * @param string $uid The ID to check if the user already voted
 *
 * @return bool True if the user has already voted, otherwise false
 */
function tu_voted($voteid, $uid) {
        $dbh = DB::connect();

        $q = "SELECT COUNT(*) FROM TU_Votes ";
        $q.= "WHERE VoteID = " . intval($voteid) . " AND UserID = " . intval($uid);
        $result = $dbh->query($q);
        if ($result->fetchColumn() > 0) {
                return true;
        }
        else {
                return false;
        }
}

/**
 * Get all current Trusted User proposals from the database
 *
 * @param string $order Ascending or descending order for the proposal listing
 *
 * @return array The details for all current Trusted User proposals
 */
function current_proposal_list($order) {
        $dbh = DB::connect();

        $q = "SELECT * FROM TU_VoteInfo WHERE End > " . time() . " ORDER BY Submitted " . $order;
        $result = $dbh->query($q);

        $details = array();
        while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
                $details[] = $row;
        }

        return $details;
}

/**
 * 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 $lim The number of proposals to list with the offset
 *
 * @return array The details for the subset of past Trusted User proposals
 */
function past_proposal_list($order, $lim) {
        $dbh = DB::connect();

        $q = "SELECT * FROM TU_VoteInfo WHERE End < " . time() . " ORDER BY Submitted " . $order . $lim;
        $result = $dbh->query($q);

        $details = array();
        while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
                $details[] = $row;
        }

        return $details;
}

/**
 * Get the vote ID of the last vote of all Trusted Users
 *
 * @return array The vote ID of the last vote of each Trusted User
 */
function last_votes_list() {
        $dbh = DB::connect();

        $q = "SELECT UserID, MAX(VoteID) AS LastVote FROM TU_Votes, ";
        $q .= "TU_VoteInfo, Users WHERE TU_VoteInfo.ID = TU_Votes.VoteID AND ";
        $q .= "TU_VoteInfo.End < UNIX_TIMESTAMP() AND ";
        $q .= "Users.ID = TU_Votes.UserID AND (Users.AccountTypeID = 2 OR Users.AccountTypeID = 4) ";
        $q .= "GROUP BY UserID ORDER BY LastVote DESC, UserName ASC";
        $result = $dbh->query($q);

        $details = array();
        while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
                $details[] = $row;
        }

        return $details;
}

/**
 * Determine the total number of Trusted User proposals
 *
 * @return string The total number of Trusted User proposals
 */
function proposal_count() {
        $dbh = DB::connect();
        $q = "SELECT COUNT(*) FROM TU_VoteInfo";
        $result = $dbh->query($q);
        $row = $result->fetch(PDO::FETCH_NUM);

        return $row[0];
}

/**
 * Get all details related to a specific vote from the database
 *
 * @param string $voteid The ID of the Trusted User proposal
 *
 * @return array All stored details for a specific vote
 */
function vote_details($voteid) {
        $dbh = DB::connect();

        $q = "SELECT * FROM TU_VoteInfo ";
        $q.= "WHERE ID = " . intval($voteid);

        $result = $dbh->query($q);
        $row = $result->fetch(PDO::FETCH_ASSOC);

        return $row;
}

/**
 * Get an alphabetical list of users who voted for a proposal with HTML links
 *
 * @param string $voteid The ID of the Trusted User proposal
 *
 * @return array All users who voted for a specific proposal
 */
function voter_list($voteid) {
        $dbh = DB::connect();

        $whovoted = array();

        $q = "SELECT tv.UserID,U.Username ";
        $q.= "FROM TU_Votes tv, Users U ";
        $q.= "WHERE tv.VoteID = " . intval($voteid);
        $q.= " AND tv.UserID = U.ID ";
        $q.= "ORDER BY Username";

        $result = $dbh->query($q);
        if ($result) {
                while ($row = $result->fetch(PDO::FETCH_ASSOC)) {
                        $whovoted[] = $row['Username'];
                }
        }
        return $whovoted;
}

/**
 * Cast a vote for a specific user proposal
 *
 * @param string $voteid The ID of the proposal being voted on
 * @param string $uid The user ID of the individual voting
 * @param string $vote Vote position, either "Yes", "No", or "Abstain"
 * @param int $newtotal The total number of votes after the user has voted
 *
 * @return void
 */
function cast_proposal_vote($voteid, $uid, $vote, $newtotal) {
        $dbh = DB::connect();

        $q = "UPDATE TU_VoteInfo SET " . $vote . " = (" . $newtotal . ") WHERE ID = " . $voteid;
        $result = $dbh->exec($q);

        $q = "INSERT INTO TU_Votes (VoteID, UserID) VALUES (" . intval($voteid) . ", " . intval($uid) . ")";
        $result = $dbh->exec($q);
}

/**
 * Verify a user has the proper permissions to edit an account
 *
 * @param array $acctinfo User account information for edited account
 *
 * @return bool True if permission to edit the account, otherwise false
 */
function can_edit_account($acctinfo) {
        if ($acctinfo['AccountType'] == 'Developer' ||
            $acctinfo['AccountType'] == 'Trusted User & Developer') {
                return has_credential(CRED_ACCOUNT_EDIT_DEV);
        }

        $uid = $acctinfo['ID'];
        return has_credential(CRED_ACCOUNT_EDIT, array($uid));
}