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 = max(SESSION_COOKIE_LIFETIME, 86400);
  13         $session_name = (!defined('TTRSS_SESSION_NAME')) ? "ttrss_sid" : TTRSS_SESSION_NAME;
  14
  15         if (@$_SERVER['HTTPS'] == "on") {
  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", $session_expire);
  24         ini_set("session.cookie_lifetime", min(0, SESSION_COOKIE_LIFETIME));
  25
  26         function session_get_schema_version($nocache = false) {
  27                 global $schema_version;
  28
  29                 if (!$schema_version) {
  30                         $result = Db::get()->query("SELECT schema_version FROM ttrss_version");
  31                         $version = Db::get()->fetch_result($result, 0, "schema_version");
  32                         $schema_version = $version;
  33                         return $version;
  34                 } else {
  35                         return $schema_version;
  36                 }
  37         }
  38
  39         function validate_session() {
  40                 if (SINGLE_USER_MODE) return true;
  41
  42                 if (VERSION_STATIC != $_SESSION["version"]) return false;
  43
  44                 $check_ip = $_SESSION['ip_address'];
  45
  46                 switch (SESSION_CHECK_ADDRESS) {
  47                 case 0:
  48                         $check_ip = '';
  49                         break;
  50                 case 1:
  51                         $check_ip = substr($check_ip, 0, strrpos($check_ip, '.')+1);
  52                         break;
  53                 case 2:
  54                         $check_ip = substr($check_ip, 0, strrpos($check_ip, '.'));
  55                         $check_ip = substr($check_ip, 0, strrpos($check_ip, '.')+1);
  56                         break;
  57                 };
  58
  59                 if ($check_ip && strpos($_SERVER['REMOTE_ADDR'], $check_ip) !== 0) {
  60                         $_SESSION["login_error_msg"] =
  61                                 __("Session failed to validate (incorrect IP)");
  62                         return false;
  63                 }
  64
  65                 if ($_SESSION["ref_schema_version"] != session_get_schema_version(true)) {
  66                         $_SESSION["login_error_msg"] =
  67                                 __("Session failed to validate (schema version changed)");
  68                         return false;
  69                 }
  70
  71                 if (sha1($_SERVER['HTTP_USER_AGENT']) != $_SESSION["user_agent"]) {
  72                         $_SESSION["login_error_msg"] =
  73                                 __("Session failed to validate (user agent changed)");
  74                         return false;
  75                 }
  76
  77                 if ($_SESSION["uid"]) {
  78                         $result = Db::get()->query(
  79                                 "SELECT pwd_hash FROM ttrss_users WHERE id = '".$_SESSION["uid"]."'");
  80
  81                         // user not found
  82                         if (Db::get()->num_rows($result) == 0) {
  83
  84                                 $_SESSION["login_error_msg"] =
  85                                         __("Session failed to validate (user not found)");
  86
  87                                 return false;
  88                         } else {
  89                                 $pwd_hash = Db::get()->fetch_result($result, 0, "pwd_hash");
  90
  91                                 if ($pwd_hash != $_SESSION["pwd_hash"]) {
  92
  93                                         $_SESSION["login_error_msg"] =
  94                                                 __("Session failed to validate (password changed)");
  95
  96                                         return false;
  97                                 }
  98                         }
  99                 }
 100
 101                 return true;
 102         }
 103
 104
 105         function ttrss_open ($s, $n) {
 106                 return true;
 107         }
 108
 109         function ttrss_read ($id){
 110                 global $session_expire;
 111
 112                 $res = Db::get()->query("SELECT data FROM ttrss_sessions WHERE id='$id'");
 113
 114                 if (Db::get()->num_rows($res) != 1) {
 115
 116                         $expire = time() + $session_expire;
 117
 118                         Db::get()->query("INSERT INTO ttrss_sessions (id, data, expire)
 119                                         VALUES ('$id', '', '$expire')");
 120
 121                         return "";
 122                 } else {
 123                         return base64_decode(Db::get()->fetch_result($res, 0, "data"));
 124                 }
 125
 126         }
 127
 128         function ttrss_write ($id, $data) {
 129                 global $session_expire;
 130
 131                 $data = base64_encode($data);
 132                 $expire = time() + $session_expire;
 133
 134                 Db::get()->query("UPDATE ttrss_sessions SET data='$data', expire='$expire' WHERE id='$id'");
 135
 136                 return true;
 137         }
 138
 139         function ttrss_close () {
 140                 return true;
 141         }
 142
 143         function ttrss_destroy($id) {
 144                 Db::get()->query("DELETE FROM ttrss_sessions WHERE id = '$id'");
 145
 146                 return true;
 147         }
 148
 149         function ttrss_gc ($expire) {
 150                 Db::get()->query("DELETE FROM ttrss_sessions WHERE expire < " . time());
 151         }
 152
 153         if (!SINGLE_USER_MODE /* && DB_TYPE == "pgsql" */) {
 154                 session_set_save_handler("ttrss_open",
 155                         "ttrss_close", "ttrss_read", "ttrss_write",
 156                         "ttrss_destroy", "ttrss_gc");
 157                 register_shutdown_function('session_write_close');
 158         }
 159
 160         if (!defined('NO_SESSION_AUTOSTART')) {
 161                 if (isset($_COOKIE[session_name()])) {
 162                         @session_start();
 163                 }
 164         }
 165 ?>