Initial version of chkoauth2v0.1.0

9 files changed, 1823 insertions, 0 deletions

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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..9897ca7
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "chkoauth2"
+version = "0.1.0"
+edition = "2021"
+description = "A CGI which validates OAuth2 tokens before calling another script."
+license = "MIT"
+repository = "https://git.jesterpm.net/pub/jesterpm/chkoauth2.git"
+authors = ["Jesse Morgan <jesse@jesterpm.net>"]
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[features]
+default = ["indieauth"]
+indieauth = ["serde"]
+
+[dependencies]
+clap = { version = "4.4.14", features = ["derive"] }
+env_logger = "0.11"
+log = "0.4"
+oauth2 = "4"
+serde = {version = "1", features = ["derive"], optional = true }
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..f1d9306
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2024 Jesse Morgan
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..2c0dd4c
--- /dev/null
+++ b/README.md
@@ -0,0 +1,70 @@
+chkoauth2
+=========
+
+chkoauth2 is a CGI-based wrapper which will validate OAuth2 bearer tokens before
+executing another script.
+
+chkoauth2 also includes an IndieAuth extension, which will pass the user's
+profiler URL to the wrapped script. See the IndieAuth specification for more
+information: https://indieauth.spec.indieweb.org/#access-token-verification
+
+
+INSTALLATION
+------------
+
+You will need Rust and Cargo to build and install this project.
+
+To install in your home directory, run:
+
+  cargo install --path .
+
+To disable the IndieAuth extension, add the `--no-default-features` flag. To
+install elsewhere, use the --root flag. See `cargo install --help` for more
+options.
+
+
+USAGE
+-----
+
+You'll need a web server that can run CGI scripts, then you'll want a script
+that runs chkoauth2 with the appropriate options. Something like:
+
+    #!/bin/sh
+    OAUTH2_CLIENT_ID="<OAuth2 client id>" \
+    OAUTH2_CLIENT_SECRET="<OAuth2 client secret>" \
+    chkoauth2 \
+      https://example.com/oauth/authorize \
+      https://example.com/oauth/introspect \
+      --scope create \
+      another.cgi
+
+The sample script uses environment variables to provide the OAuth2 client
+identity for interacting with the introspection endpoint, which is hosted at
+example.com. chkoauth2 expects your web server to provided the Authorization
+header in the `HTTP_AUTHORIZATION` environment variable. If the header contains
+a valid Bearer token, and the token grants the required scope(s) ("create", in
+this case), then chkoauth2 will invoke `another.cgi`. Otherwise, an appropriate
+error will be returned.
+
+The full list of granted scopes is passed to the application through the
+`OAUTH2_SCOPES` environment variable, allowing the wrapped CGI to check for an
+optional scope. If the IndieAuth extension is enabled, the profile URL is passed
+in the `INDIEAUTH_ME` environment variable.
+
+chkoauth2 can log debug and warning information to stderr. The log level is set
+by adding the `RUST_LOG` environment variable to `error`, `warn`, `info`,
+`debug`, or `trace`.
+
+
+CONTRIBUTING
+------------
+
+Send feedback, questions, or patches to jesse@jesterpm.net.
+
+
+LICENSE
+-------
+
+This software is distributed under the MIT License. See LICENSE for more
+information.
+
diff --git a/rustfmt.toml b/rustfmt.toml
new file mode 100644
index 0000000..df99c69
--- /dev/null
+++ b/rustfmt.toml
@@ -0,0 +1 @@
+max_width = 80
diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..4ecd1a3
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,68 @@
+use oauth2::http::{header, Response, StatusCode};
+use std::fmt::{Display, Formatter};
+use std::io;
+
+#[derive(Debug)]
+#[allow(clippy::enum_variant_names)]
+pub enum Error {
+    IoError(io::Error),
+    MissingToken,
+    InvalidToken,
+    ConfigurationError,
+    IntrospectionServerError,
+    AccessDenied,
+}
+
+impl Display for Error {
+    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+        f.write_str(match self {
+            Error::IoError(e) => return write!(f, "IO Error: {}", e),
+            Error::AccessDenied => "Access denied",
+            Error::MissingToken => "Missing authorization token",
+            Error::InvalidToken => "Invalid access token",
+            Error::ConfigurationError => "OAuth2 client configuration error",
+            Error::IntrospectionServerError => {
+                "Introspection endpoint returned an error"
+            }
+        })
+    }
+}
+
+impl From<&Error> for StatusCode {
+    fn from(e: &Error) -> StatusCode {
+        match e {
+            Error::IoError(_) => StatusCode::INTERNAL_SERVER_ERROR,
+            Error::AccessDenied => StatusCode::FORBIDDEN,
+            Error::MissingToken => StatusCode::UNAUTHORIZED,
+            Error::InvalidToken => StatusCode::UNAUTHORIZED,
+            Error::ConfigurationError => StatusCode::INTERNAL_SERVER_ERROR,
+            Error::IntrospectionServerError => StatusCode::SERVICE_UNAVAILABLE,
+        }
+    }
+}
+
+impl From<Error> for Response<Option<String>> {
+    fn from(e: Error) -> Response<Option<String>> {
+        let resp = Response::builder().status(StatusCode::from(&e));
+        match e {
+            Error::IoError(_) => resp.body(None).unwrap(),
+            Error::AccessDenied => resp
+                .header(header::WWW_AUTHENTICATE, "Bearer")
+                .body(Some("{\"error\": \"insufficient_scope\"}".to_string()))
+                .unwrap(),
+            Error::MissingToken => resp.body(None).unwrap(),
+            Error::InvalidToken => resp
+                .header(header::WWW_AUTHENTICATE, "Bearer")
+                .body(Some("{\"error\": \"invalid_token\"}".to_string()))
+                .unwrap(),
+            Error::ConfigurationError => resp.body(None).unwrap(),
+            Error::IntrospectionServerError => resp.body(None).unwrap(),
+        }
+    }
+}
+
+impl From<io::Error> for Error {
+    fn from(e: io::Error) -> Self {
+        Error::IoError(e)
+    }
+}
diff --git a/src/indieauth.rs b/src/indieauth.rs
new file mode 100644
index 0000000..0f04b84
--- /dev/null
+++ b/src/indieauth.rs
@@ -0,0 +1,21 @@
+//! Extras for working with IndieAuth endpoints.
+
+use oauth2::ExtraTokenFields;
+use serde::{Deserialize, Serialize};
+
+/// An IndieAuth access token and introspection reponse has an additional
+/// `me` field.
+///
+/// See https://indieauth.spec.indieweb.org/#access-token-verification
+#[derive(Debug, Serialize, Deserialize, Clone)]
+pub struct IndieAuthToken {
+    me: String,
+}
+
+impl IndieAuthToken {
+    pub fn me(&self) -> &str {
+        &self.me
+    }
+}
+
+impl ExtraTokenFields for IndieAuthToken {}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..ec91ec1
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,183 @@
+use clap::Parser;
+use oauth2::basic::BasicErrorResponseType;
+use oauth2::http::Response;
+use oauth2::url::Url;
+use oauth2::{
+    basic::BasicTokenType, reqwest, AccessToken, AuthUrl, ClientId,
+    ClientSecret, IntrospectionUrl, StandardErrorResponse,
+    StandardRevocableToken, StandardTokenIntrospectionResponse,
+    StandardTokenResponse, TokenIntrospectionResponse,
+};
+use std::collections::HashSet;
+use std::io::Write;
+use std::process::Command;
+use std::{env, io, process};
+
+#[cfg(feature = "indieauth")]
+mod indieauth;
+
+mod error;
+use error::Error;
+
+/// A CGI wrapper to validate OAuth2 bearer tokens before executing another
+/// script.
+#[derive(Parser, Debug)]
+struct Args {
+    /// The OAuth2 client id to authenticate with the introspection endpoint.
+    /// This may also be provided through the OAUTH2_CLIENT_ID environment
+    /// variable.
+    #[arg(long = "client-id")]
+    client_id: Option<String>,
+
+    /// The OAuth2 client secret.
+    /// This may also be provided through the OAUTH2_CLIENT_SECRET environment
+    /// variable.
+    #[arg(long = "secret")]
+    client_secret: Option<String>,
+    /// Scopes that must be present for the request to succeed.
+    #[arg(long = "scope")]
+    scope: Vec<String>,
+
+    /// The URL of the Authorization endpoint.
+    auth_url: Url,
+
+    /// The URL of the token introspection endpoint.
+    introspection_url: Url,
+
+    /// The command to run if authorized.
+    command: String,
+
+    /// Arguments to pass to the command.
+    args: Vec<String>,
+}
+
+const BEARER_TOKEN_PREFIX: &str = "Bearer ";
+
+#[cfg(feature = "indieauth")]
+type TokenType = indieauth::IndieAuthToken;
+#[cfg(not(feature = "indieauth"))]
+type TokenType = oauth2::EmptyExtraTokenFields;
+
+type Client = oauth2::Client<
+    StandardErrorResponse<BasicErrorResponseType>,
+    StandardTokenResponse<TokenType, BasicTokenType>,
+    BasicTokenType,
+    StandardTokenIntrospectionResponse<TokenType, BasicTokenType>,
+    StandardRevocableToken,
+    StandardErrorResponse<BasicErrorResponseType>,
+>;
+
+fn handle_request() -> Result<Response<Option<String>>, Error> {
+    let args = Args::parse();
+
+    let client_id = args
+        .client_id
+        .or_else(|| env::var("OAUTH2_CLIENT_ID").ok())
+        .map(ClientId::new)
+        .expect("Missing required argument --client-id");
+
+    let client_secret = args
+        .client_secret
+        .or_else(|| env::var("OAUTH2_CLIENT_SECRET").ok())
+        .map(ClientSecret::new);
+
+    let client = Client::new(
+        client_id,
+        client_secret,
+        AuthUrl::from_url(args.auth_url),
+        None,
+    )
+    .set_introspection_uri(IntrospectionUrl::from_url(args.introspection_url));
+
+    let access_token = env::var("HTTP_AUTHORIZATION")
+        .ok()
+        .filter(|value| value.starts_with(BEARER_TOKEN_PREFIX))
+        .map(|value| {
+            AccessToken::new(
+                value.split_at(BEARER_TOKEN_PREFIX.len()).1.to_string(),
+            )
+        })
+        .ok_or_else(|| {
+            log::info!("Authorization failed due to missing or malformed Authorization header");
+            Error::MissingToken
+        })?;
+
+    let resp = client
+        .introspect(&access_token)
+        .map_err(|e| {
+            log::error!("OAuth2 client configuration error: {}", e);
+            Error::ConfigurationError
+        })?
+        .request(reqwest::http_client)
+        .map_err(|e| {
+            log::warn!("Error from token introspection service: {:?}", e);
+            Error::IntrospectionServerError
+        })
+        .and_then(|resp| {
+            if resp.active() {
+                Ok(resp)
+            } else {
+                log::info!("Authorization failed due to invalid token");
+                Err(Error::InvalidToken)
+            }
+        })?;
+
+    let authorized_scopes: HashSet<&str> = resp
+        .scopes()
+        .iter()
+        .flat_map(|s| s.iter())
+        .map(|s| s.as_ref())
+        .collect();
+
+    // Check if all required scopes are granted by the token.
+    if !args
+        .scope
+        .iter()
+        .all(|s| authorized_scopes.contains(s.as_str()))
+    {
+        log::info!("Authorization failed due to missing required scope(s)");
+        return Err(Error::AccessDenied);
+    }
+
+    let scopes = authorized_scopes.iter().fold(String::new(), |mut a, b| {
+        a.push_str(b);
+        a.push(' ');
+        a
+    });
+
+    let mut cmd = Command::new(args.command);
+    cmd.args(args.args);
+    cmd.env("OAUTH2_SCOPES", scopes.trim_end());
+
+    #[cfg(feature = "indieauth")]
+    cmd.env("INDIEAUTH_ME", resp.extra_fields().me());
+
+    let status = cmd.status()?.code().unwrap_or(0);
+
+    process::exit(status)
+}
+
+fn main() {
+    env_logger::init();
+
+    let resp = handle_request().unwrap_or_else(|e| e.into());
+    println!(
+        "Status: {} {}",
+        resp.status().as_str(),
+        resp.status().canonical_reason().unwrap_or("")
+    );
+
+    for (name, value) in resp.headers().iter() {
+        print!("{}: ", name);
+        io::stdout().write_all(value.as_bytes()).expect("IO Error");
+        println!();
+    }
+
+    if let Some(body) = resp.body() {
+        println!("Content-Type: application/json");
+        println!();
+        println!("{}", body)
+    } else {
+        println!();
+    }
+}