include/sessions.php

   1 <?php
   2         // Original from http://www.daniweb.com/code/snippet43.html
   3
   4         require_once "config.php";
   5         require_once "classes/db.php";
   6         require_once "autoload.php";
   7         require_once "errorhandler.php";
   8         require_once "lib/accept-to-gettext.php";
   9         require_once "lib/gettext/gettext.inc";
  10         require_once "version.php";
  11
  12         $session_expire = min(2147483647 - time() - 1, max(SESSION_COOKIE_LIFETIME, 86400));
  13         $session_name = (!defined('TTRSS_SESSION_NAME')) ? "ttrss_sid" : TTRSS_SESSION_NAME;
  14
  15         if (is_server_https()) {
  16                 $session_name .= "_ssl";
  17                 ini_set("session.cookie_secure", true);
  18         }
  19
  20         ini_set("session.gc_probability", 75);
  21         ini_set("session.name", $session_name);
  22         ini_set("session.use_only_cookies", true);
  23         ini_set("session.gc_maxlifetime", $session_expire);
  24         ini_set("session.cookie_lifetime", min(0, SESSION_COOKIE_LIFETIME));
  25
  26         function session_get_schema_version() {
  27                 global $schema_version;
  28
  29                 if (!$schema_version) {
  30                         $row = Db::pdo()->query("SELECT schema_version FROM ttrss_version")->fetch();
  31
  32                         $version = $row["schema_version"];
  33
  34                         $schema_version = $version;
  35                         return $version;
  36                 } else {
  37                         return $schema_version;
  38                 }
  39         }
  40
  41         function validate_session() {
  42                 if (SINGLE_USER_MODE) return true;
  43
  44                 if (isset($_SESSION["ref_schema_version"]) && $_SESSION["ref_schema_version"] != session_get_schema_version()) {
  45                         $_SESSION["login_error_msg"] =
  46                                 __("Session failed to validate (schema version changed)");
  47                         return false;
  48                 }
  49         $pdo = Db::pdo();
  50
  51                 if ($_SESSION["uid"]) {
  52
  53                         if (!defined('_SKIP_SESSION_ADDRESS_CHECKS') || !_SKIP_SESSION_ADDRESS_CHECKS) {
  54                                 if ($_SESSION["ip_address"] != $_SERVER["REMOTE_ADDR"]) {
  55                                         $_SESSION["login_error_msg"] = __("Session failed to validate.");
  56                                         return false;
  57                                 }
  58                         }
  59
  60                         if ($_SESSION["user_agent"] != sha1($_SERVER['HTTP_USER_AGENT'])) {
  61                                 $_SESSION["login_error_msg"] = __("Session failed to validate.");
  62                                 return false;
  63                         }
  64
  65                         $sth = $pdo->prepare("SELECT pwd_hash FROM ttrss_users WHERE id = ?");
  66                         $sth->execute([$_SESSION['uid']]);
  67
  68                         // user not found
  69                         if ($row = $sth->fetch()) {
  70                 $pwd_hash = $row["pwd_hash"];
  71
  72                 if ($pwd_hash != $_SESSION["pwd_hash"]) {
  73
  74                     $_SESSION["login_error_msg"] =
  75                         __("Session failed to validate (password changed)");
  76
  77                     return false;
  78                 }
  79                         } else {
  80
  81                 $_SESSION["login_error_msg"] =
  82                     __("Session failed to validate (user not found)");
  83
  84                 return false;
  85
  86                         }
  87                 }
  88
  89                 return true;
  90         }
  91
  92         /**
  93          * @SuppressWarnings(PHPMD.UnusedFormalParameter)
  94          */
  95         function ttrss_open ($s, $n) {
  96                 return true;
  97         }
  98
  99         function ttrss_read ($id){
 100                 global $session_expire;
 101
 102                 $sth = Db::pdo()->prepare("SELECT data FROM ttrss_sessions WHERE id=?");
 103                 $sth->execute([$id]);
 104
 105                 if ($row = $sth->fetch()) {
 106             return base64_decode($row["data"]);
 107
 108                 } else {
 109             $expire = time() + $session_expire;
 110
 111             $sth = Db::pdo()->prepare("INSERT INTO ttrss_sessions (id, data, expire)
 112                                         VALUES (?, '', ?)");
 113             $sth->execute([$id, $expire]);
 114
 115             return "";
 116
 117                 }
 118
 119         }
 120
 121         function ttrss_write ($id, $data) {
 122                 global $session_expire;
 123
 124                 $data = base64_encode($data);
 125                 $expire = time() + $session_expire;
 126
 127         $sth = Db::pdo()->prepare("UPDATE ttrss_sessions SET data=?, expire=? WHERE id=?");
 128         $sth->execute([$data, $expire, $id]);
 129
 130                 return true;
 131         }
 132
 133         function ttrss_close () {
 134                 return true;
 135         }
 136
 137         function ttrss_destroy($id) {
 138                 $sth = Db::pdo()->prepare("DELETE FROM ttrss_sessions WHERE id = ?");
 139                 $sth->execute([$id]);
 140
 141                 return true;
 142         }
 143
 144         /**
 145          * @SuppressWarnings(PHPMD.UnusedFormalParameter)
 146          */
 147         function ttrss_gc ($expire) {
 148                 Db::pdo()->query("DELETE FROM ttrss_sessions WHERE expire < " . time());
 149
 150                 return true;
 151         }
 152
 153         if (!SINGLE_USER_MODE /* && DB_TYPE == "pgsql" */) {
 154                 session_set_save_handler("ttrss_open",
 155                         "ttrss_close", "ttrss_read", "ttrss_write",
 156                         "ttrss_destroy", "ttrss_gc");
 157                 register_shutdown_function('session_write_close');
 158         }
 159
 160         if (!defined('NO_SESSION_AUTOSTART')) {
 161                 if (isset($_COOKIE[session_name()])) {
 162                         @session_start();
 163
 164                         if (!$_SESSION['uid']) {
 165                                 logout_user();
 166                         }
 167                 }
 168         }