RUST-2144 Use recommended openssl probing API (mongodb#1297)

Author: abr-egn

src/runtime/tls_openssl.rs

@@ -1,4 +1,4 @@
-use std::{pin::Pin, sync::Once};
+use std::pin::Pin;
 
 use openssl::{
     error::ErrorStack,
@@ -45,8 +45,6 @@ pub(super) async fn tls_connect(
     tcp_stream: TcpStream,
     cfg: &TlsConfig,
 ) -> Result<TlsStream> {
-    init_trust();
-
     let mut stream = make_ssl_stream(host, tcp_stream, cfg).map_err(|err| {
         Error::from(ErrorKind::InvalidTlsConfig {
             message: err.to_string(),
@@ -71,6 +69,11 @@ fn make_openssl_connector(cfg: TlsOptions) -> Result<SslConnector> {
 
     let mut builder = SslConnector::builder(SslMethod::tls_client()).map_err(openssl_err)?;
 
+    let probe = openssl_probe::probe();
+    builder
+        .load_verify_locations(probe.cert_file.as_deref(), probe.cert_dir.as_deref())
+        .map_err(openssl_err)?;
+
     let TlsOptions {
         allow_invalid_certificates,
         ca_file_path,
@@ -111,15 +114,6 @@ fn make_openssl_connector(cfg: TlsOptions) -> Result<SslConnector> {
     Ok(builder.build())
 }
 
-fn init_trust() {
-    static ONCE: Once = Once::new();
-    // nosemgrep: unsafe-usage
-    ONCE.call_once(|| unsafe {
-        // mongodb rating: No Fix Needed
-        openssl_probe::init_openssl_env_vars()
-    })
-}
-
 fn make_ssl_stream(
     host: &str,
     tcp_stream: TcpStream,