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client: refactor verification callback

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return a result with optional fingerprint instead of tuple, allowing
easy extraction of a meaningful error message.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
This commit is contained in:
Fabian Grünbichler 2021-05-10 10:52:33 +02:00 committed by Thomas Lamprecht
parent 56d98ba966
commit 065013ccec
1 changed files with 24 additions and 16 deletions
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40
src/client/http_client.rs
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@ -316,9 +316,9 @@ impl HttpClient {
let fingerprint_cache = options.fingerprint_cache;
let prefix = options.prefix.clone();
ssl_connector_builder.set_verify_callback(openssl::ssl::SslVerifyMode::PEER, move |valid, ctx| {
let (valid, fingerprint) = Self::verify_callback(valid, ctx, expected_fingerprint.as_ref(), interactive);
if valid {
if let Some(fingerprint) = fingerprint {
match Self::verify_callback(valid, ctx, expected_fingerprint.as_ref(), interactive) {
Ok(None) => true,
Ok(Some(fingerprint)) => {
if fingerprint_cache && prefix.is_some() {
if let Err(err) = store_fingerprint(
prefix.as_ref().unwrap(), &server, &fingerprint) {
@ -326,9 +326,13 @@ impl HttpClient {
}
}
*verified_fingerprint.lock().unwrap() = Some(fingerprint);
}
true
},
Err(err) => {
eprintln!("certificate validation failed - {}", err);
false
},
}
valid
});
} else {
ssl_connector_builder.set_verify(openssl::ssl::SslVerifyMode::NONE);
@ -474,24 +478,27 @@ impl HttpClient {
}
fn verify_callback(
valid: bool,
openssl_valid: bool,
ctx: &mut X509StoreContextRef,
expected_fingerprint: Option<&String>,
interactive: bool,
) -> (bool, Option<String>) {
if valid { return (true, None); }
) -> Result<Option<String>, Error> {
if openssl_valid {
return Ok(None);
}
let cert = match ctx.current_cert() {
Some(cert) => cert,
None => return (false, None),
None => bail!("context lacks current certificate."),
};
let depth = ctx.error_depth();
if depth != 0 { return (false, None); }
if depth != 0 { bail!("context depth != 0") }
let fp = match cert.digest(openssl::hash::MessageDigest::sha256()) {
Ok(fp) => fp,
Err(_) => return (false, None), // should not happen
Err(err) => bail!("failed to calculate certificate FP - {}", err), // should not happen
};
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())
@ -500,7 +507,7 @@ impl HttpClient {
if let Some(expected_fingerprint) = expected_fingerprint {
let expected_fingerprint = expected_fingerprint.to_lowercase();
if expected_fingerprint == fp_string {
return (true, Some(fp_string));
return Ok(Some(fp_string));
} else {
eprintln!("WARNING: certificate fingerprint does not match expected fingerprint!");
eprintln!("expected: {}", expected_fingerprint);
@ -519,18 +526,19 @@ impl HttpClient {
Ok(_) => {
let trimmed = line.trim();
if trimmed == "y" || trimmed == "Y" {
return (true, Some(fp_string));
return Ok(Some(fp_string));
} else if trimmed == "n" || trimmed == "N" {
return (false, None);
bail!("Certificate fingerprint was not confirmed.");
} else {
continue;
}
}
Err(_) => return (false, None),
Err(err) => bail!("Certificate fingerprint was not confirmed - {}.", err),
}
}
}
(false, None)
bail!("Certificate fingerprint was not confirmed.");
}
pub async fn request(&self, mut req: Request<Body>) -> Result<Value, Error> {