in case we have no explicit fingerprint, we use openssl's regular "PEER"
verification. if we have a fingerprint, we ignore openssl altogether and
just verify the fingerprint of the presented leaf certificate.
Signed-off-by: Fabian Grünbichler <f.gruenbich...@proxmox.com>
---
Cargo.toml | 1 +
src/main.rs | 47 ++++++++++++++++++++++++++++++++++++++++++++---
2 files changed, 45 insertions(+), 3 deletions(-)
diff --git a/Cargo.toml b/Cargo.toml
index 9d2a8c6..adf83f9 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,6 +16,7 @@ futures-util = "0.3"
hyper = { version = "0.14" }
openssl = "0.10"
percent-encoding = "2"
+proxmox = { version = "0.15" }
proxmox-http = { version = "0.5.2", path = "../proxmox/proxmox-http", features
= ["websocket", "client"] }
serde = { version = "1.0", features = ["derive"] }
serde_json = "1.0"
diff --git a/src/main.rs b/src/main.rs
index 150c1cf..0733141 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -138,9 +138,50 @@ impl CtrlTunnel {
}
let mut ssl_connector_builder =
SslConnector::builder(SslMethod::tls()).unwrap();
- if fingerprint.is_some() {
- // FIXME actually verify fingerprint via callback!
-
ssl_connector_builder.set_verify(openssl::ssl::SslVerifyMode::NONE);
+ if let Some(expected) = fingerprint {
+ ssl_connector_builder.set_verify_callback(
+ openssl::ssl::SslVerifyMode::NONE,
+ move |_valid, ctx| {
+ let cert = match ctx.current_cert() {
+ Some(cert) => cert,
+ None => {
+ eprintln!("SSL context lacks current
certificate.");
+ return false;
+ }
+ };
+
+ let depth = ctx.error_depth();
+ if depth != 0 {
+ return true;
+ }
+
+ let fp = match
cert.digest(openssl::hash::MessageDigest::sha256()) {
+ Ok(fp) => fp,
+ Err(err) => {
+ // should not happen
+ eprintln!("failed to calculate certificate FP -
{}", err);
+ return false;
+ }
+ };
+ let fp_string = proxmox::tools::digest_to_hex(&fp);
+ let fp_string = fp_string
+ .as_bytes()
+ .chunks(2)
+ .map(|v| std::str::from_utf8(v).unwrap())
+ .collect::<Vec<&str>>()
+ .join(":");
+
+ let expected = expected.to_lowercase();
+ if expected == fp_string {
+ true
+ } else {
+ eprintln!("certificate fingerprint does not match
expected fingerprint!");
+ eprintln!("expected: {}", expected);
+ eprintln!("encountered: {}", fp_string);
+ false
+ }
+ },
+ );
} else {
ssl_connector_builder.set_verify(openssl::ssl::SslVerifyMode::PEER);
}
--
2.30.2
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