From: Fabian Ebner <f.ebner@proxmox.com>
To: pve-devel@lists.proxmox.com,
"Fabian Grünbichler" <f.gruenbichler@proxmox.com>
Subject: Re: [pve-devel] [PATCH v3 proxmox-websocket-tunnel 3/4] add fingerprint validation
Date: Tue, 4 Jan 2022 12:37:30 +0100 [thread overview]
Message-ID: <a133e124-913d-956b-c66c-d8a8d1f03332@proxmox.com> (raw)
In-Reply-To: <20211222135257.3242938-7-f.gruenbichler@proxmox.com>
Am 22.12.21 um 14:52 schrieb Fabian Grünbichler:
> 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.gruenbichler@proxmox.com>
> ---
>
> Notes:
> v3: switch to using hex instead of no-longer-existing digest_to_hex
> v2: new
>
> src/main.rs | 47 ++++++++++++++++++++++++++++++++++++++++++++---
> 1 file changed, 44 insertions(+), 3 deletions(-)
>
> diff --git a/src/main.rs b/src/main.rs
> index 582214c..49d6ffe 100644
> --- a/src/main.rs
> +++ b/src/main.rs
> @@ -134,9 +134,50 @@ impl CtrlTunnel {
> }
>
> let mut ssl_connector_builder = SslConnector::builder(SslMethod::tls())?;
> - 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;
> + }
Sorry about my ignorance. Does using SslVerifyMode::NONE imply that
there is an error? At depth 0? Why is it fine to return true if not?
> +
> + 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 = hex::encode(&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);
> }
next prev parent reply other threads:[~2022-01-04 11:37 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-12-22 13:52 [pve-devel] [PATCH v3 qemu-server++ 0/21] remote migration Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 guest-common 1/3] migrate: handle migration_network with " Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 guest-common 2/3] add tunnel helper module Fabian Grünbichler
2022-01-03 12:30 ` Fabian Ebner
[not found] ` <<47e7d41f-e328-d9fa-25b7-f7585de8ce5b@proxmox.com>
2022-01-19 14:30 ` Fabian Grünbichler
2022-01-20 9:57 ` Fabian Ebner
2021-12-22 13:52 ` [pve-devel] [PATCH v3 guest-common 3/3] add storage tunnel module Fabian Grünbichler
2022-01-03 14:30 ` Fabian Ebner
[not found] ` <<af15fed1-2d06-540e-cde8-ed1ce772aeb4@proxmox.com>
2022-01-19 14:31 ` Fabian Grünbichler
2022-01-05 10:50 ` Fabian Ebner
2021-12-22 13:52 ` [pve-devel] [PATCH v3 proxmox-websocket-tunnel 1/4] initial commit Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 proxmox-websocket-tunnel 2/4] add tunnel implementation Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 proxmox-websocket-tunnel 3/4] add fingerprint validation Fabian Grünbichler
2022-01-04 11:37 ` Fabian Ebner [this message]
2022-01-19 10:34 ` Fabian Grünbichler
2022-01-19 12:16 ` Fabian Ebner
2022-01-19 12:53 ` Josef Johansson
2021-12-22 13:52 ` [pve-devel] [PATCH v3 proxmox-websocket-tunnel 4/4] add packaging Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 01/10] refactor map_storage to map_id Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 02/10] schema: use pve-bridge-id Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 03/10] parse_config: optional strict mode Fabian Grünbichler
2022-01-04 11:57 ` Fabian Ebner
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 04/10] update_vm: allow simultaneous setting of boot-order and dev Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 05/10] nbd alloc helper: allow passing in explicit format Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 06/10] migrate: move tunnel-helpers to pve-guest-common Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 07/10] mtunnel: add API endpoints Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 08/10] migrate: refactor remote VM/tunnel start Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 09/10] migrate: add remote migration handling Fabian Grünbichler
2022-01-04 13:58 ` Fabian Ebner
2022-01-04 16:44 ` Roland
2022-01-11 8:19 ` Thomas Lamprecht
[not found] ` <<554040de-09d6-974b-143a-80c2d66b9573@proxmox.com>
2022-01-19 14:32 ` Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 qemu-server 10/10] api: add remote migrate endpoint Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 storage 1/4] volname_for_storage: parse volname before calling Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 storage 2/4] storage_migrate: pull out snapshot decision Fabian Grünbichler
2022-01-05 9:00 ` Fabian Ebner
2022-01-19 14:38 ` Fabian Grünbichler
2021-12-22 13:52 ` [pve-devel] [PATCH v3 storage 3/4] storage_migrate: pull out import/export_prepare Fabian Grünbichler
2022-01-05 9:59 ` Fabian Ebner
2021-12-22 13:52 ` [pve-devel] [PATCH v3 storage 4/4] add volume_import/export_start helpers Fabian Grünbichler
2021-12-23 13:56 ` [pve-devel] [PATCH v3 qemu-server++ 0/21] remote migration Fabian Grünbichler
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