feat(tls): Optionally support loading native certs (#11491)

This commit adds "DENO_TLS_CA_STORE" env variable to support 
optionally loading certificates from the users local certificate store. 
This will allow them to successfully connect via tls with corporate 
and self signed certs provided they have them installed in their keystore. 
It also allows them to deal with revoked certs by simply updating 
their keystore without having to upgrade Deno.

Currently supported values are "mozilla", "system" or empty value.

cli/program_state.rs

@@ -30,12 +30,16 @@ use deno_core::resolve_url;
 use deno_core::url::Url;
 use deno_core::ModuleSource;
 use deno_core::ModuleSpecifier;
+use deno_tls::rustls::RootCertStore;
+use deno_tls::rustls_native_certs::load_native_certs;
+use deno_tls::webpki_roots::TLS_SERVER_ROOTS;
 use log::debug;
 use log::warn;
 use std::collections::HashMap;
 use std::collections::HashSet;
 use std::env;
-use std::fs::read;
+use std::fs::File;
+use std::io::BufReader;
 use std::sync::Arc;
 
 /// This structure represents state of single "deno" program.
@@ -53,7 +57,7 @@ pub struct ProgramState {
   pub maybe_config_file: Option<ConfigFile>,
   pub maybe_import_map: Option<ImportMap>,
   pub maybe_inspector_server: Option<Arc<InspectorServer>>,
-  pub ca_data: Option<Vec<u8>>,
+  pub root_cert_store: Option<RootCertStore>,
   pub blob_store: BlobStore,
   pub broadcast_channel: InMemoryBroadcastChannel,
   pub shared_array_buffer_store: SharedArrayBufferStore,
@@ -68,11 +72,50 @@ impl ProgramState {
     let dir = deno_dir::DenoDir::new(maybe_custom_root)?;
     let deps_cache_location = dir.root.join("deps");
     let http_cache = http_cache::HttpCache::new(&deps_cache_location);
+
+    let mut root_cert_store = RootCertStore::empty();
+    let ca_stores: Vec<String> = flags
+      .ca_stores
+      .clone()
+      .or_else(|| {
+        let env_ca_store = env::var("DENO_TLS_CA_STORE").ok()?;
+        Some(
+          env_ca_store
+            .split(',')
+            .map(|s| s.trim().to_string())
+            .filter(|s| !s.is_empty())
+            .collect(),
+        )
+      })
+      .unwrap_or_else(|| vec!["mozilla".to_string()]);
+
+    for store in ca_stores.iter() {
+      match store.as_str() {
+        "mozilla" => {
+          root_cert_store.add_server_trust_anchors(&TLS_SERVER_ROOTS);
+        }
+        "system" => {
+          let roots = load_native_certs()
+            .expect("could not load platform certs")
+            .roots;
+          root_cert_store.roots.extend(roots);
+        }
+        _ => {
+          return Err(anyhow!("Unknown certificate store \"{}\" specified (allowed: \"system,mozilla\")", store));
+        }
+      }
+    }
+
     let ca_file = flags.ca_file.clone().or_else(|| env::var("DENO_CERT").ok());
-    let ca_data = match &ca_file {
-      Some(ca_file) => Some(read(ca_file).context("Failed to open ca file")?),
-      None => None,
-    };
+    if let Some(ca_file) = ca_file {
+      let certfile = File::open(&ca_file)?;
+      let mut reader = BufReader::new(certfile);
+
+      // This function does not return specific errors, if it fails give a generic message.
+      if let Err(_err) = root_cert_store.add_pem_file(&mut reader) {
+        return Err(anyhow!("Unable to add pem file to certificate store"));
+      }
+    }
 
     let cache_usage = if flags.cached_only {
       CacheSetting::Only
@@ -92,7 +135,7 @@ impl ProgramState {
       http_cache,
       cache_usage,
       !flags.no_remote,
-      ca_data.clone(),
+      Some(root_cert_store.clone()),
       blob_store.clone(),
     )?;
 
@@ -152,7 +195,7 @@ impl ProgramState {
       maybe_config_file,
       maybe_import_map,
       maybe_inspector_server,
-      ca_data,
+      root_cert_store: Some(root_cert_store.clone()),
       blob_store,
       broadcast_channel,
       shared_array_buffer_store,