From b839d892c57216e05aa2e5b71bd51377dd874392 Mon Sep 17 00:00:00 2001 From: Paul Zinselmeyer Date: Tue, 24 Sep 2024 12:52:03 +0200 Subject: [PATCH] Initial Commit Initial implementation of RFC4559 for axum. --- .gitignore | 2 + Cargo.toml | 33 +++ LICENSE.md | 676 ++++++++++++++++++++++++++++++++++++++++++++++ README.md | 26 ++ examples/basic.rs | 31 +++ src/lib.rs | 241 +++++++++++++++++ 6 files changed, 1009 insertions(+) create mode 100644 .gitignore create mode 100644 Cargo.toml create mode 100644 LICENSE.md create mode 100644 README.md create mode 100644 examples/basic.rs create mode 100644 src/lib.rs diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..96ef6c0 --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +/target +Cargo.lock diff --git a/Cargo.toml b/Cargo.toml new file mode 100644 index 0000000..6230b70 --- /dev/null +++ b/Cargo.toml @@ -0,0 +1,33 @@ +[package] +name = "axum-negotiate" +description = "Kerberos SPNEGO and NTLM Authentication(RFC4559) for axum" +version = "0.1.1" +edition = "2021" +authors = [ "Paul Zinselmeyer" ] +readme = "README.md" +repository = "https://github.com/pfzetto/axum-negotiate" +license = "LGPL-3.0-or-later" +keywords = [ "axum", "ntlm", "kerberos", "spnego", "gssapi" ] + +# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html + +[dependencies] +log = "0.4" +thiserror = "1.0" +base64 = "0.22" +axum-core = "0.4" +http = "1.1" +tower-layer = "0.3" +tower-service = "0.3" +libgssapi = "0.7" +futures-util = "0.3" +async-trait = "0.1" + +[dev-dependencies] +env_logger = "0.11" +tokio = { version = "1.39", features = ["full"] } +axum = "0.7" +tower = "0.4" + +[[example]] +name = "basic" diff --git a/LICENSE.md b/LICENSE.md new file mode 100644 index 0000000..cb54347 --- /dev/null +++ b/LICENSE.md @@ -0,0 +1,676 @@ + +# GNU GENERAL PUBLIC LICENSE + +Version 3, 29 June 2007 + +Copyright (C) 2007 Free Software Foundation, Inc. + + +Everyone is permitted to copy and distribute verbatim copies of this +license document, but changing it is not allowed. + +## Preamble + +The GNU General Public License is a free, copyleft license for +software and other kinds of works. + +The licenses for most software and other practical works are designed +to take away your freedom to share and change the works. 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Interpretation of Sections 15 and 16. + +If the disclaimer of warranty and limitation of liability provided +above cannot be given local legal effect according to their terms, +reviewing courts shall apply local law that most closely approximates +an absolute waiver of all civil liability in connection with the +Program, unless a warranty or assumption of liability accompanies a +copy of the Program in return for a fee. + +END OF TERMS AND CONDITIONS + +## How to Apply These Terms to Your New Programs + +If you develop a new program, and you want it to be of the greatest +possible use to the public, the best way to achieve this is to make it +free software which everyone can redistribute and change under these +terms. + +To do so, attach the following notices to the program. It is safest to +attach them to the start of each source file to most effectively state +the exclusion of warranty; and each file should have at least the +"copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see . + +Also add information on how to contact you by electronic and paper +mail. + +If the program does terminal interaction, make it output a short +notice like this when it starts in an interactive mode: + + Copyright (C) + This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands \`show w' and \`show c' should show the +appropriate parts of the General Public License. Of course, your +program's commands might be different; for a GUI interface, you would +use an "about box". + +You should also get your employer (if you work as a programmer) or +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. For more information on this, and how to apply and follow +the GNU GPL, see . + +The GNU General Public License does not permit incorporating your +program into proprietary programs. If your program is a subroutine +library, you may consider it more useful to permit linking proprietary +applications with the library. If this is what you want to do, use the +GNU Lesser General Public License instead of this License. But first, +please read . diff --git a/README.md b/README.md new file mode 100644 index 0000000..c7195ee --- /dev/null +++ b/README.md @@ -0,0 +1,26 @@ + +This Library allows using [Kerberos SPNEGO HTTP-Authentication](https://www.rfc-editor.org/rfc/rfc4559) with [axum](https://github.com/tokio-rs/axum). + +# Usage +The `NegotiateAuthLayer` forces every request to be authenticated. +Handlers can use the `Upn` extractor to get the user principal name. + +# Examples +Take a look at the `examples` folder for examples. + +# Limitations +Currently this library only supports two-pass SPNEGO as it doesn't require state across multiple requests on the server. + +# Older Versions +All versions on [crates.io](https://crates.io) are available as git tags. +Additional all minor versions have their own branch (format `vX.Y` where `X` is the major and `Y` is the minor version) where bug fixes are implemented. +Examples for each version can be found there in the previously mentioned `examples` folder. + +# Contributing +I'm happy about any contribution in any form. +Feel free to submit feature requests and bug reports using a GitHub Issue. +PR's are also appreciated. + +# License +This Library is licensed under [LGPLv3](https://www.gnu.org/licenses/lgpl-3.0.en.html). + diff --git a/examples/basic.rs b/examples/basic.rs new file mode 100644 index 0000000..eaa3ead --- /dev/null +++ b/examples/basic.rs @@ -0,0 +1,31 @@ +use axum::{error_handling::HandleErrorLayer, response::IntoResponse, routing::get, Router}; +use axum_negotiate::{NegotiateAuthLayer, Upn}; +use log::warn; +use tokio::net::TcpListener; +use tower::ServiceBuilder; + +#[tokio::main] +async fn main() { + env_logger::init(); + + let spn = "HTTP/webserver.example.com"; + + let auth_service = ServiceBuilder::new() + .layer(HandleErrorLayer::new(|e: axum_negotiate::Error| async { + warn!("{}", e); + e.into_response() + })) + .layer(NegotiateAuthLayer::new(spn.to_owned()).unwrap()); + + let app = Router::new() + .route("/", get(hello_world)) + .route_layer(auth_service); + + let listener = TcpListener::bind("[::]:8080").await.unwrap(); + + axum::serve(listener, app).await.unwrap() +} + +async fn hello_world(Upn(upn): Upn) -> impl IntoResponse { + format!("Hello {}", upn) +} diff --git a/src/lib.rs b/src/lib.rs new file mode 100644 index 0000000..b437a19 --- /dev/null +++ b/src/lib.rs @@ -0,0 +1,241 @@ +#![deny(unsafe_code)] +#![deny(clippy::unwrap_used)] + +use std::{borrow::Borrow, ops::Deref}; + +use async_trait::async_trait; +use libgssapi::{ + context::{SecurityContext, ServerCtx}, + credential::{Cred, CredUsage}, + name::Name, + oid::{OidSet, GSS_MECH_SPNEGO, GSS_NT_KRB5_PRINCIPAL}, +}; +use log::{debug, error}; + +use base64::{engine::general_purpose::STANDARD, Engine as _}; + +use axum_core::{ + extract::FromRequestParts, + response::{IntoResponse, Response}, +}; +use futures_util::future::BoxFuture; +use http::{ + header::{AUTHORIZATION, WWW_AUTHENTICATE}, + request::Parts, + HeaderValue, Request, StatusCode, +}; +use thiserror::Error; +use tower_layer::Layer; +use tower_service::Service; + +pub trait NextMiddlewareError: std::error::Error + IntoResponse + Send + Sync { + fn box_into_response(self: Box) -> Response; +} +impl NextMiddlewareError for T { + fn box_into_response(self: Box) -> Response { + self.into_response() + } +} +pub type NextMiddlewareBoxError = Box; + +#[derive(Error, Debug)] +pub enum Error { + #[error("invalid characters in spn")] + InvalidSpn, + + #[error("next middleware: {0}")] + NextMiddleware(NextMiddlewareBoxError), + + #[error("libgssapi: {0}")] + GssApi(#[from] libgssapi::error::Error), + + #[error("multistage spnego is requested but currently not supported")] + MultipassSpnego, + + #[error("invalid authorization header")] + InvalidAuthorizationHeader, + + #[error("invalid gssapi_data")] + InvalidGssapiData, + + #[error("UPN extension not found in request")] + UpnExtensionNotFound, +} +impl IntoResponse for Error { + fn into_response(self) -> Response { + match self { + Self::InvalidSpn | Self::MultipassSpnego | Self::GssApi(_) => { + (StatusCode::INTERNAL_SERVER_ERROR, "internal server error").into_response() + } + Self::NextMiddleware(error) => error.box_into_response(), + Self::InvalidGssapiData => (StatusCode::BAD_REQUEST, "bad request").into_response(), + Self::UpnExtensionNotFound | Self::InvalidAuthorizationHeader => { + let mut response = (StatusCode::UNAUTHORIZED, "unauthorized").into_response(); + response + .headers_mut() + .insert(WWW_AUTHENTICATE, HeaderValue::from_static("Negotiate")); + response + } + } + } +} + +#[derive(Clone)] +pub struct NegotiateAuthLayer { + spn: String, +} + +impl NegotiateAuthLayer { + pub fn new(spn: String) -> Result { + //TODO: check if libgssapi really can't handle utf16 characters. remove the ascii check if + //it does. + if spn.is_ascii() { + Ok(Self { spn }) + } else { + Err(Error::InvalidSpn) + } + } +} + +impl Layer for NegotiateAuthLayer { + type Service = NegotiateAuthLayerMiddleware; + + fn layer(&self, inner: I) -> Self::Service { + Self::Service { + inner, + spn: self.spn.to_owned(), + } + } +} + +/// The user principal name of the user +#[derive(Clone, Debug)] +pub struct Upn(pub Box); + +#[async_trait] +impl FromRequestParts for Upn { + type Rejection = Error; + + async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result { + parts + .extensions + .get::() + .cloned() + .ok_or(Error::UpnExtensionNotFound) + } +} + +impl AsRef for Upn { + fn as_ref(&self) -> &str { + &self.0 + } +} +impl Borrow for Upn { + fn borrow(&self) -> &str { + &self.0 + } +} +impl Deref for Upn { + type Target = str; + + fn deref(&self) -> &Self::Target { + &self.0 + } +} + +#[derive(Clone)] +pub struct NegotiateAuthLayerMiddleware { + inner: I, + spn: String, +} + +impl Service> for NegotiateAuthLayerMiddleware +where + I: Service, Response = Response> + Clone + Send + 'static, + I::Error: NextMiddlewareError, + I::Future: Send + 'static, + B: Send + 'static, +{ + type Response = I::Response; + + type Error = Error; + + type Future = BoxFuture<'static, Result>; + + fn poll_ready( + &mut self, + cx: &mut std::task::Context<'_>, + ) -> std::task::Poll> { + self.inner + .poll_ready(cx) + .map_err(|e| Error::NextMiddleware(Box::new(e))) + } + + fn call(&mut self, mut req: Request) -> Self::Future { + let inner = self.inner.clone(); + let mut inner = std::mem::replace(&mut self.inner, inner); + + let spn = self.spn.clone(); + + Box::pin(async move { + let Some(authorization_header) = req + .headers() + .get(AUTHORIZATION) + .and_then(|x| x.to_str().ok()) + else { + debug!("authorization header not present"); + return Err(Error::InvalidAuthorizationHeader); + }; + + let Some(gssapi_data) = authorization_header.strip_prefix("Negotiate ") else { + debug!("authorization header has no prefix \"Negotiate\""); + return Err(Error::InvalidAuthorizationHeader); + }; + + let Ok(gssapi_data) = STANDARD.decode(gssapi_data) else { + debug!("authorization header gssapi_data contains invalid base64"); + return Err(Error::InvalidGssapiData); + }; + + let mut ctx = new_server_ctx(&spn)?; + + let token = ctx.step(&gssapi_data)?; + + if !ctx.is_complete() { + error!("currently only 2-pass SPNEGO is supported"); + return Err(Error::MultipassSpnego); + }; + + let upn = ctx.source_name()?.to_string(); + req.extensions_mut().insert(Upn(upn.into())); + + let mut response = inner + .call(req) + .await + .map_err(|x| Error::NextMiddleware(Box::new(x)))?; + + response.headers_mut().insert( + WWW_AUTHENTICATE, + format!( + "Negotiate {}", + token.map(|x| STANDARD.encode(&*x)).unwrap_or_default() + ) + .parse() + .expect("base64 to be ascii"), + ); + + Ok(response) + }) + } +} + +fn new_server_ctx(principal: &str) -> Result { + let name = Name::new(principal.as_bytes(), Some(&GSS_NT_KRB5_PRINCIPAL))? + .canonicalize(Some(&GSS_MECH_SPNEGO))?; + let cred = { + let mut s = OidSet::new()?; + s.add(&GSS_MECH_SPNEGO)?; + Cred::acquire(Some(&name), None, CredUsage::Accept, Some(&s))? + }; + Ok(ServerCtx::new(cred)) +}