implement basic feed authentication parameter encryption in the database (FEED_CRYPT_KEY)

classes/pref/feeds.php

@@ -528,6 +528,9 @@ class Pref_Feeds extends Handler_Protected {
 			"SELECT * FROM ttrss_feeds WHERE id = '$feed_id' AND
 				owner_uid = " . $_SESSION["uid"]);
 
+		$auth_pass_encrypted = sql_bool_to_bool(db_fetch_result($result, 0,
+			"auth_pass_encrypted"));
+
 		$title = htmlspecialchars(db_fetch_result($result,
 			0, "title"));
 
@@ -613,7 +616,14 @@ class Pref_Feeds extends Handler_Protected {
 			placeHolder=\"".__("Login")."\"
 			name=\"auth_login\" value=\"$auth_login\"><hr/>";
 
-		$auth_pass = htmlspecialchars(db_fetch_result($result, 0, "auth_pass"));
+		$auth_pass = db_fetch_result($result, 0, "auth_pass");
+
+		if ($auth_pass_encrypted) {
+			require_once "crypt.php";
+			$auth_pass = decrypt_string($auth_pass);
+		}
+
+		$auth_pass = htmlspecialchars($auth_pass);
 
 		print "<input dojoType=\"dijit.form.TextBox\" type=\"password\" name=\"auth_pass\"
 			placeHolder=\"".__("Password")."\"
@@ -936,6 +946,14 @@ class Pref_Feeds extends Handler_Protected {
 		$mark_unread_on_update = checkbox_to_sql_bool(
 			db_escape_string($this->link, $_POST["mark_unread_on_update"]));
 
+		if (strlen(FEED_CRYPT_KEY) > 0) {
+			require_once "crypt.php";
+			$auth_pass = substr(encrypt_string($auth_pass), 0, 250);
+			$auth_pass_encrypted = 'true';
+		} else {
+			$auth_pass_encrypted = 'false';
+		}
+
 		if (get_pref($this->link, 'ENABLE_FEED_CATS')) {
 			if ($cat_id && $cat_id != 0) {
 				$category_qpart = "cat_id = '$cat_id',";
@@ -958,6 +976,7 @@ class Pref_Feeds extends Handler_Protected {
 				purge_interval = '$purge_intl',
 				auth_login = '$auth_login',
 				auth_pass = '$auth_pass',
+				auth_pass_encrypted = $auth_pass_encrypted,
 				private = $private,
 				cache_images = $cache_images,
 				hide_images = $hide_images,
@@ -1003,7 +1022,8 @@ class Pref_Feeds extends Handler_Protected {
 						break;
 
 					case "auth_pass":
-						$qpart = "auth_pass = '$auth_pass'";
+						$qpart = "auth_pass = '$auth_pass' AND
+							auth_pass_encrypted = $auth_pass_encrypted";
 						break;
 
 					case "private":
@@ -1841,12 +1861,20 @@ class Pref_Feeds extends Handler_Protected {
 					"SELECT id FROM ttrss_feeds
 					WHERE feed_url = '$feed' AND owner_uid = ".$_SESSION["uid"]);
 
+				if (strlen(FEED_CRYPT_KEY) > 0) {
+					require_once "crypt.php";
+					$pass = substr(encrypt_string($pass), 0, 250);
+					$auth_pass_encrypted = 'true';
+				} else {
+					$auth_pass_encrypted = 'false';
+				}
+
 				if (db_num_rows($result) == 0) {
 					$result = db_query($this->link,
 						"INSERT INTO ttrss_feeds
-							(owner_uid,feed_url,title,cat_id,auth_login,auth_pass,update_method)
+							(owner_uid,feed_url,title,cat_id,auth_login,auth_pass,update_method,auth_pass_encrypted)
 						VALUES ('".$_SESSION["uid"]."', '$feed',
-							'[Unknown]', $cat_qpart, '$login', '$pass', 0)");
+							'[Unknown]', $cat_qpart, '$login', '$pass', 0, $auth_pass_encrypted)");
 				}
 
 				db_query($this->link, "COMMIT");

config.php-dist

@@ -24,6 +24,13 @@
 	// You need to set this option correctly otherwise several features
 	// including PUSH, bookmarklets and browser integration will not work properly.
 
+	define('FEED_CRYPT_KEY', '');
+   // Key used for encryption of login/passwords for password-protected feeds
+   // in the database. A string of 24 random characters. If left blank, encryption
+	// is not used. Requires mcrypt functions.
+	// Warning: changing this key will make your stored feed passwords impossible
+	// to decrypt.
+	
 	define('SINGLE_USER_MODE', false);
 	// Operate in single user mode, disables all functionality related to
 	// multiple users and authentication. Enabling this assumes you have

include/crypt.php

@@ -0,0 +1,36 @@
+<?php
+	function decrypt_string($str) {
+		$pair = explode(":", $str);
+
+		if (count($pair) == 2) {
+			@$iv = base64_decode($pair[0]);
+			@$encstr = base64_decode($pair[1]);
+
+			if ($iv && $encstr) {
+				$key = hash('SHA256', FEED_CRYPT_KEY, true);
+
+				$str = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encstr,
+					MCRYPT_MODE_CBC, $iv);
+
+				if ($str) return rtrim($str);
+			}
+		}
+
+		return false;
+	}
+
+	function encrypt_string($str) {
+		$key = hash('SHA256', FEED_CRYPT_KEY, true);
+
+		$iv = mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_128,
+			MCRYPT_MODE_CBC), MCRYPT_RAND);
+
+		$encstr = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, $key, $str,
+			MCRYPT_MODE_CBC, $iv);
+
+		$iv_base64 = base64_encode($iv);
+		$encstr_base64 = base64_encode($encstr);
+
+		return "$iv_base64:$encstr_base64";
+	}
+?>

include/functions.php

@@ -1614,12 +1614,20 @@
 			"SELECT id FROM ttrss_feeds
 			WHERE feed_url = '$url' AND owner_uid = ".$_SESSION["uid"]);
 
+		if (strlen(FEED_CRYPT_KEY) > 0) {
+			require_once "crypt.php";
+			$auth_pass = substr(encrypt_string($auth_pass), 0, 250);
+			$auth_pass_encrypted = 'true';
+		} else {
+			$auth_pass_encrypted = 'false';
+		}
+
 		if (db_num_rows($result) == 0) {
 			$result = db_query($link,
 				"INSERT INTO ttrss_feeds
-					(owner_uid,feed_url,title,cat_id, auth_login,auth_pass,update_method)
+					(owner_uid,feed_url,title,cat_id, auth_login,auth_pass,update_method,auth_pass_encrypted)
 				VALUES ('".$_SESSION["uid"]."', '$url',
-				'[Unknown]', $cat_qpart, '$auth_login', '$auth_pass', 0)");
+				'[Unknown]', $cat_qpart, '$auth_login', '$auth_pass', 0, $auth_pass_encrypted)");
 
 			$result = db_query($link,
 				"SELECT id FROM ttrss_feeds WHERE feed_url = '$url'

include/rssfuncs.php

@@ -203,7 +203,7 @@
 		$result = db_query($link, "SELECT id,update_interval,auth_login,
 			feed_url,auth_pass,cache_images,last_updated,
 			mark_unread_on_update, owner_uid,
-			pubsub_state
+			pubsub_state, auth_pass_encrypted
 			FROM ttrss_feeds WHERE id = '$feed'");
 
 		if (db_num_rows($result) == 0) {
@@ -218,6 +218,8 @@
 		$mark_unread_on_update = sql_bool_to_bool(db_fetch_result($result,
 			0, "mark_unread_on_update"));
 		$pubsub_state = db_fetch_result($result, 0, "pubsub_state");
+		$auth_pass_encrypted = sql_bool_to_bool(db_fetch_result($result,
+			0, "auth_pass_encrypted"));
 
 		db_query($link, "UPDATE ttrss_feeds SET last_update_started = NOW()
 			WHERE id = '$feed'");
@@ -225,6 +227,11 @@
 		$auth_login = db_fetch_result($result, 0, "auth_login");
 		$auth_pass = db_fetch_result($result, 0, "auth_pass");
 
+		if ($auth_pass_encrypted) {
+			require_once "crypt.php";
+			$auth_pass = decrypt_string($auth_pass);
+		}
+
 		$cache_images = sql_bool_to_bool(db_fetch_result($result, 0, "cache_images"));
 		$fetch_url = db_fetch_result($result, 0, "feed_url");
 

include/sanity_check.php

@@ -67,6 +67,14 @@
 				array_push($errors, "Javascript cache is not writable (chmod -R 777 ".CACHE_DIR."/js)");
 			}
 
+			if (strlen(FEED_CRYPT_KEY) != 24) {
+				array_push($errors, "FEED_CRYPT_KEY should be exactly 24 characters in length.");
+			}
+
+			if (strlen(FEED_CRYPT_KEY) != 0 && !function_exists("mcrypt_decrypt")) {
+				array_push($errors, "FEED_CRYPT_KEY requires mcrypt functions which are not found.");
+			}
+
 			if (GENERATED_CONFIG_CHECK != EXPECTED_CONFIG_VERSION) {
 				array_push($errors,
 					"Configuration option checker sanity_config.php is outdated, please recreate it using ./utils/regen_config_checks.sh");

include/sanity_config.php

@@ -1,3 +1,3 @@
-<?php # This file has been generated at:  Mon Apr 1 18:30:54 IDT 2013
+<?php # This file has been generated at:  Sat Apr 13 17:41:19 MSK 2013
 define('GENERATED_CONFIG_CHECK', 26);
-$requred_defines = array( 'DB_TYPE', 'DB_HOST', 'DB_USER', 'DB_NAME', 'DB_PASS', 'MYSQL_CHARSET', 'SELF_URL_PATH', 'SINGLE_USER_MODE', 'SIMPLE_UPDATE_MODE', 'PHP_EXECUTABLE', 'LOCK_DIRECTORY', 'CACHE_DIR', 'ICONS_DIR', 'ICONS_URL', 'AUTH_AUTO_CREATE', 'AUTH_AUTO_LOGIN', 'FORCE_ARTICLE_PURGE', 'PUBSUBHUBBUB_HUB', 'PUBSUBHUBBUB_ENABLED', 'SPHINX_ENABLED', 'SPHINX_INDEX', 'ENABLE_REGISTRATION', 'REG_NOTIFY_ADDRESS', 'REG_MAX_USERS', 'SESSION_COOKIE_LIFETIME', 'SESSION_CHECK_ADDRESS', 'SMTP_FROM_NAME', 'SMTP_FROM_ADDRESS', 'DIGEST_SUBJECT', 'SMTP_HOST', 'SMTP_PORT', 'SMTP_LOGIN', 'SMTP_PASSWORD', 'CHECK_FOR_NEW_VERSION', 'ENABLE_GZIP_OUTPUT', 'PLUGINS', 'CONFIG_VERSION'); ?>
+$requred_defines = array( 'DB_TYPE', 'DB_HOST', 'DB_USER', 'DB_NAME', 'DB_PASS', 'MYSQL_CHARSET', 'SELF_URL_PATH', 'FEED_CRYPT_KEY', 'SINGLE_USER_MODE', 'SIMPLE_UPDATE_MODE', 'PHP_EXECUTABLE', 'LOCK_DIRECTORY', 'CACHE_DIR', 'ICONS_DIR', 'ICONS_URL', 'AUTH_AUTO_CREATE', 'AUTH_AUTO_LOGIN', 'FORCE_ARTICLE_PURGE', 'PUBSUBHUBBUB_HUB', 'PUBSUBHUBBUB_ENABLED', 'SPHINX_ENABLED', 'SPHINX_INDEX', 'ENABLE_REGISTRATION', 'REG_NOTIFY_ADDRESS', 'REG_MAX_USERS', 'SESSION_COOKIE_LIFETIME', 'SESSION_CHECK_ADDRESS', 'SMTP_FROM_NAME', 'SMTP_FROM_ADDRESS', 'DIGEST_SUBJECT', 'SMTP_HOST', 'SMTP_PORT', 'SMTP_LOGIN', 'SMTP_PASSWORD', 'CHECK_FOR_NEW_VERSION', 'ENABLE_GZIP_OUTPUT', 'PLUGINS', 'CONFIG_VERSION'); ?>

install/index.php

@@ -10,6 +10,25 @@
 <body>
 
 <?php
+	function make_password($length = 8) {
+
+		$password = "";
+		$possible = "0123456789abcdfghjkmnpqrstvwxyzABCDFGHJKMNPQRSTVWXYZ*%+^";
+
+   	$i = 0;
+
+		while ($i < $length) {
+			$char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
+
+			if (!strstr($password, $char)) {
+				$password .= $char;
+				$i++;
+			}
+		}
+		return $password;
+	}
+
+
 	function sanity_check($db_type) {
 		$errors = array();
 
@@ -108,6 +127,12 @@
 
 		$finished = false;
 
+		if (function_exists("mcrypt_decrypt")) {
+			$crypt_key = make_password(24);
+		} else {
+			$crypt_key = "";
+		}
+
 		foreach ($data as $line) {
 			if (preg_match("/define\('DB_TYPE'/", $line)) {
 				$rv .= "\tdefine('DB_TYPE', '$DB_TYPE');\n";
@@ -123,6 +148,8 @@
 				$rv .= "\tdefine('DB_PORT', '$DB_PORT');\n";
 			} else if (preg_match("/define\('SELF_URL_PATH'/", $line)) {
 				$rv .= "\tdefine('SELF_URL_PATH', '$SELF_URL_PATH');\n";
+			} else if (preg_match("/define\('FEED_CRYPT_KEY'/", $line)) {
+				$rv .= "\tdefine('FEED_CRYPT_KEY', '$crypt_key');\n";
 			} else if (!$finished) {
 				$rv .= "$line\n";
 			}