net: Add an SSL verification callback to support checking a dynamic list of certs.

components/net/connector.rs

@@ -8,8 +8,12 @@ use hyper::client::HttpConnector as HyperHttpConnector;
 use hyper::rt::Future;
 use hyper::{Body, Client};
 use hyper_openssl::HttpsConnector;
-use openssl::ssl::{SslConnector, SslConnectorBuilder, SslMethod, SslOptions};
-use openssl::x509;
+use openssl::ex_data::Index;
+use openssl::ssl::{
+    SslConnector, SslConnectorBuilder, SslContext, SslMethod, SslOptions, SslVerifyMode,
+};
+use openssl::x509::{self, X509StoreContext};
+use std::sync::{Arc, Mutex};
 use tokio::prelude::future::Executor;
 
 pub const BUF_SIZE: usize = 32768;
@@ -60,7 +64,20 @@ impl Connect for HttpConnector {
 pub type Connector = HttpsConnector<HttpConnector>;
 pub type TlsConfig = SslConnectorBuilder;
 
-pub fn create_tls_config(certs: &str, alpn: &[u8]) -> TlsConfig {
+#[derive(Clone)]
+pub(crate) struct ExtraCerts(pub Arc<Mutex<Vec<Vec<u8>>>>);
+
+impl ExtraCerts {
+    pub(crate) fn new() -> Self {
+        Self(Arc::new(Mutex::new(vec![])))
+    }
+}
+
+lazy_static! {
+    static ref INDEX: Index<SslContext, ExtraCerts> = SslContext::new_ex_index().unwrap();
+}
+
+pub(crate) fn create_tls_config(certs: &str, alpn: &[u8], extra_certs: ExtraCerts) -> TlsConfig {
     // certs include multiple certificates. We could add all of them at once,
     // but if any of them were already added, openssl would fail to insert all
     // of them.
@@ -104,6 +121,32 @@ pub fn create_tls_config(certs: &str, alpn: &[u8]) -> TlsConfig {
             SslOptions::NO_COMPRESSION,
     );
 
+    cfg.set_ex_data(*INDEX, extra_certs);
+    cfg.set_verify_callback(SslVerifyMode::PEER, |verified, x509_store_context| {
+        if verified {
+            return true;
+        }
+        if let Some(cert) = x509_store_context.current_cert() {
+            match cert.to_pem() {
+                Ok(pem) => {
+                    let ssl_idx = X509StoreContext::ssl_idx().unwrap();
+                    let ssl = x509_store_context.ex_data(ssl_idx).unwrap();
+                    let ssl_context = ssl.ssl_context();
+                    let extra_certs = ssl_context.ex_data(*INDEX).unwrap();
+                    for cert in &*extra_certs.0.lock().unwrap() {
+                        if pem == *cert {
+                            return true;
+                        }
+                    }
+                    false
+                },
+                Err(_) => false,
+            }
+        } else {
+            false
+        }
+    });
+
     cfg
 }
 

components/net/resource_thread.rs

@@ -4,7 +4,7 @@
 
 //! A thread that takes a URL and streams back the binary data.
 
-use crate::connector::{create_http_client, create_tls_config, ALPN_H2_H1};
+use crate::connector::{create_http_client, create_tls_config, ExtraCerts, ALPN_H2_H1};
 use crate::cookie;
 use crate::cookie_storage::CookieStorage;
 use crate::fetch::cors_cache::CorsCache;
@@ -127,7 +127,7 @@ struct ResourceChannelManager {
 fn create_http_states(
     config_dir: Option<&Path>,
     certificate_path: Option<String>,
-) -> (Arc<HttpState>, Arc<HttpState>) {
+) -> (Arc<HttpState>, Arc<HttpState>, ExtraCerts) {
     let mut hsts_list = HstsList::from_servo_preload();
     let mut auth_cache = AuthCache::new();
     let http_cache = HttpCache::new();
@@ -143,6 +143,8 @@ fn create_http_states(
         None => resources::read_string(Resource::SSLCertificates),
     };
 
+    let extra_certs = ExtraCerts::new();
+
     let http_state = HttpState {
         hsts_list: RwLock::new(hsts_list),
         cookie_jar: RwLock::new(cookie_jar),
@@ -151,7 +153,7 @@ fn create_http_states(
         http_cache: RwLock::new(http_cache),
         http_cache_state: Mutex::new(HashMap::new()),
         client: create_http_client(
-            create_tls_config(&certs, ALPN_H2_H1),
+            create_tls_config(&certs, ALPN_H2_H1, extra_certs.clone()),
             HANDLE.lock().unwrap().as_ref().unwrap().executor(),
         ),
     };
@@ -164,12 +166,16 @@ fn create_http_states(
         http_cache: RwLock::new(HttpCache::new()),
         http_cache_state: Mutex::new(HashMap::new()),
         client: create_http_client(
-            create_tls_config(&certs, ALPN_H2_H1),
+            create_tls_config(&certs, ALPN_H2_H1, extra_certs.clone()),
             HANDLE.lock().unwrap().as_ref().unwrap().executor(),
         ),
     };
 
-    (Arc::new(http_state), Arc::new(private_http_state))
+    (
+        Arc::new(http_state),
+        Arc::new(private_http_state),
+        extra_certs,
+    )
 }
 
 impl ResourceChannelManager {
@@ -180,7 +186,7 @@ impl ResourceChannelManager {
         private_receiver: IpcReceiver<CoreResourceMsg>,
         memory_reporter: IpcReceiver<ReportsChan>,
     ) {
-        let (public_http_state, private_http_state) = create_http_states(
+        let (public_http_state, private_http_state, extra_certs) = create_http_states(
             self.config_dir.as_ref().map(Deref::deref),
             self.certificate_path.clone(),
         );

components/net/websocket_loader.rs

@@ -2,7 +2,7 @@
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
 
-use crate::connector::{create_tls_config, ALPN_H1};
+use crate::connector::{create_tls_config, ExtraCerts, ALPN_H1};
 use crate::cookie::Cookie;
 use crate::fetch::methods::should_be_blocked_due_to_bad_port;
 use crate::hosts::replace_host;
@@ -167,7 +167,7 @@ impl<'a> Handler for Client<'a> {
                 WebSocketErrorKind::Protocol,
                 format!("Unable to parse domain from {}. Needed for SSL.", url),
             ))?;
-        let tls_config = create_tls_config(&certs, ALPN_H1);
+        let tls_config = create_tls_config(&certs, ALPN_H1, ExtraCerts::new());
         tls_config
             .build()
             .connect(domain, stream)