Updated icon blacklisting.

- Blacklisting was not effective for redirects and rel href
- Able to blacklist non global IP's like RFC1918, multicast etc...

src/api/icons.rs

@@ -1,12 +1,13 @@
 use std::fs::{create_dir_all, remove_file, symlink_metadata, File};
 use std::io::prelude::*;
+use std::net::ToSocketAddrs;
 use std::time::{Duration, SystemTime};
 
 use rocket::http::ContentType;
 use rocket::response::Content;
 use rocket::Route;
 
-use reqwest::{header::HeaderMap, Client, Response};
+use reqwest::{header::HeaderMap, Client, Response, Url};
 
 use rocket::http::Cookie;
 
@@ -60,15 +61,9 @@ fn icon(domain: String) -> Content<Vec<u8>> {
         return Content(icon_type, FALLBACK_ICON.to_vec());
     }
 
-    if let Some(blacklist) = CONFIG.icon_blacklist_regex() {
-        info!("Icon blacklist enabled: {:#?}", blacklist);
-
-        let regex = Regex::new(&blacklist).expect("Valid Regex");
-
-        if regex.is_match(&domain) {
-            warn!("Blacklisted domain: {:#?}", domain);
-            return Content(icon_type, FALLBACK_ICON.to_vec());
-        }
+    if check_icon_domain_is_blacklisted(&domain) {
+        warn!("Domain is blacklisted: {:#?}", domain);
+        return Content(icon_type, FALLBACK_ICON.to_vec());
     }
 
     let icon = get_icon(&domain);
@@ -76,6 +71,37 @@ fn icon(domain: String) -> Content<Vec<u8>> {
     Content(icon_type, icon)
 }
 
+fn check_icon_domain_is_blacklisted(domain: &str) -> bool {
+    let mut is_blacklisted = false;
+    if CONFIG.icon_blacklist_non_global_ips() {
+        is_blacklisted = (domain, 0)
+            .to_socket_addrs()
+            .map(|x| {
+                for ip_port in x {
+                    if !ip_port.ip().is_global() {
+                        warn!("IP {} for domain '{}' is not a global IP!", ip_port.ip(), domain);
+                        return true;
+                    }
+                }
+                false
+            })
+            .unwrap_or(false);
+    }
+
+    // Skip the regex check if the previous one is true already
+    if !is_blacklisted {
+        if let Some(blacklist) = CONFIG.icon_blacklist_regex() {
+            let regex = Regex::new(&blacklist).expect("Valid Regex");
+            if regex.is_match(&domain) {
+                warn!("Blacklisted domain: {:#?} matched {:#?}", domain, blacklist);
+                is_blacklisted = true;
+            }
+        }
+    }
+
+    is_blacklisted
+}
+
 fn get_icon(domain: &str) -> Vec<u8> {
     let path = format!("{}/{}.png", CONFIG.icon_cache_folder(), domain);
 
@@ -202,6 +228,7 @@ fn get_icon_url(domain: &str) -> Result<(Vec<Icon>, String), Error> {
     if let Ok(content) = resp {
         // Extract the URL from the respose in case redirects occured (like @ gitlab.com)
         let url = content.url().clone();
+
         let raw_cookies = content.headers().get_all("set-cookie");
         cookie_str = raw_cookies
             .iter()
@@ -253,6 +280,9 @@ fn get_page(url: &str) -> Result<Response, Error> {
 }
 
 fn get_page_with_cookies(url: &str, cookie_str: &str) -> Result<Response, Error> {
+    if check_icon_domain_is_blacklisted(Url::parse(url).unwrap().host_str().unwrap_or_default()) {
+        err!("Favicon rel linked to a non blacklisted domain!");
+    }
     CLIENT
         .get(url)
         .header("cookie", cookie_str)

src/config.rs

@@ -267,6 +267,9 @@ make_config! {
         /// Icon blacklist Regex |> Any domains or IPs that match this regex won't be fetched by the icon service.
         /// Useful to hide other servers in the local network. Check the WIKI for more details
         icon_blacklist_regex:   String, true,   option;
+        /// Icon blacklist non global IPs |> Any IP which is not defined as a global IP will be blacklisted.
+        /// Usefull to secure your internal environment: See https://en.wikipedia.org/wiki/Reserved_IP_addresses for a list of IPs which it will block
+        icon_blacklist_non_global_ips:  bool,   true,   def,    true;
 
         /// Disable Two-Factor remember |> Enabling this would force the users to use a second factor to login every time.
         /// Note that the checkbox would still be present, but ignored.

src/main.rs

@@ -1,4 +1,4 @@
-#![feature(proc_macro_hygiene, decl_macro, vec_remove_item, try_trait)]
+#![feature(proc_macro_hygiene, decl_macro, vec_remove_item, try_trait, ip)]
 #![recursion_limit = "256"]
 
 #[cfg(feature = "openssl")]