4 files changed, 453 insertions, 0 deletions
diff --git a/src/authentication_page.html b/src/authentication_page.html
new file mode 100644
index 0000000..73ec85a
--- /dev/null
+++ b/src/authentication_page.html
@@ -0,0 +1,9 @@
+<h2>Authentication Required</h2>
+<form method='post' action='{{action}}'>
+    <input type='hidden' name='redirect' value='{{redirect}}' />
+    <table>
+        <tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>
+        <tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>
+        <tr><td colspan='2'><input value='Login' type='submit' /></td></tr>
+    </table>
+</form>
+\ No newline at end of file
diff --git a/src/database.rs b/src/database.rs
new file mode 100644
index 0000000..1a1dedf
--- /dev/null
+++ b/src/database.rs
@@ -0,0 +1,43 @@
+/*
+ ** Copyright (C) 2021 KunoiSayami
+ **
+ ** This file is part of cgit-simple-authentication and is released under
+ ** the AGPL v3 License: https://www.gnu.org/licenses/agpl-3.0.txt
+ **
+ ** This program is free software: you can redistribute it and/or modify
+ ** it under the terms of the GNU Affero General Public License as published by
+ ** the Free Software Foundation, either version 3 of the License, or
+ ** 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 Affero General Public License for more details.
+ **
+ ** You should have received a copy of the GNU Affero General Public License
+ ** along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+#[allow(dead_code)]
+pub mod v1 {
+    pub const CREATE_TABLES: &str = r#"
+    CREATE TABLE "accounts" (
+        "user"	TEXT NOT NULL,
+        "password"	TEXT NOT NULL,
+        PRIMARY KEY("user")
+    );
+
+
+    CREATE TABLE "auth_meta" (
+        "key"	TEXT NOT NULL,
+        "value"	TEXT NOT NULL,
+        PRIMARY KEY("key")
+    );
+
+    INSERT INTO "auth_meta" VALUES ('version', '1');
+    "#;
+
+    pub const VERSION: &str = "1";
+
+}
+pub use v1::VERSION;
+pub use v1 as current;
diff --git a/src/datastructures.rs b/src/datastructures.rs
new file mode 100644
index 0000000..7ee01a9
--- /dev/null
+++ b/src/datastructures.rs
@@ -0,0 +1,75 @@
+/*
+ ** Copyright (C) 2021 KunoiSayami
+ **
+ ** This file is part of cgit-simple-authentication and is released under
+ ** the AGPL v3 License: https://www.gnu.org/licenses/agpl-3.0.txt
+ **
+ ** This program is free software: you can redistribute it and/or modify
+ ** it under the terms of the GNU Affero General Public License as published by
+ ** the Free Software Foundation, either version 3 of the License, or
+ ** 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 Affero General Public License for more details.
+ **
+ ** You should have received a copy of the GNU Affero General Public License
+ ** along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+
+use sha2::Digest;
+use anyhow::Result;
+
+#[derive(Debug, Clone, Default)]
+pub struct Config {
+
+}
+
+impl Config {
+    pub fn new() -> Self {
+        Self {}
+    }
+}
+
+
+#[derive(Debug, Clone, Default)]
+pub struct FormData {
+    user: String,
+    password: String,
+    hash: String,
+}
+
+impl FormData {
+    pub fn new() -> Self {
+        Self { ..Default::default()}
+    }
+
+    pub fn set_password(&mut self, password: String) {
+        self.password = password;
+        self.hash = Default::default();
+    }
+
+    pub fn set_user(&mut self, user: String) {
+        self.user = user
+    }
+
+    pub fn get_user(&self) -> &String {
+        &self.user
+    }
+
+    pub fn get_password_sha256(&self) -> Result<String> {
+        let mut hasher = sha2::Sha256::new();
+        hasher.update(self.password.as_bytes());
+        Ok(format!("{:x}", hasher.finalize()))
+    }
+
+    #[allow(dead_code)]
+    pub fn get_password_sha256_cache(&mut self) -> Result<String> {
+        if self.hash.len() == 0 {
+            self.hash = self.get_password_sha256()?;
+        }
+        Ok(self.hash.clone())
+    }
+}
+\ No newline at end of file
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..81f09e2
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,326 @@
+/*
+ ** Copyright (C) 2021 KunoiSayami
+ **
+ ** This file is part of cgit-simple-authentication and is released under
+ ** the AGPL v3 License: https://www.gnu.org/licenses/agpl-3.0.txt
+ **
+ ** This program is free software: you can redistribute it and/or modify
+ ** it under the terms of the GNU Affero General Public License as published by
+ ** the Free Software Foundation, either version 3 of the License, or
+ ** 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 Affero General Public License for more details.
+ **
+ ** You should have received a copy of the GNU Affero General Public License
+ ** along with this program. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+mod database;
+mod datastructures;
+
+use std::fs::OpenOptions;
+use anyhow::Result;
+use std::io::{Write, stdin, Read};
+use std::{process, env};
+use log::LevelFilter;
+use syslog::{Formatter3164, Facility, BasicLogger};
+use clap::{Arg, App, SubCommand, ArgMatches};
+use rand::Rng;
+use serde::{Serialize};
+use handlebars::Handlebars;
+use std::borrow::Cow;
+use url::form_urlencoded;
+use sqlx::Connection;
+use crate::datastructures::{Config, FormData};
+use redis::Commands;
+
+const COOKIE_LENGTH: usize = 45;
+
+fn rand_str(len: usize) -> String {
+    const CHARSET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\
+                        abcdefghijklmnopqrstuvwxyz\
+                        0123456789";
+    let mut rng = rand::thread_rng();
+
+    let password: String = (0..len)
+        .map(|_| {
+            let idx = rng.gen_range(0, CHARSET.len());
+            CHARSET[idx] as char
+        })
+        .collect();
+
+    password
+}
+
+
+#[derive(Serialize)]
+struct Meta<'a> {
+    action: &'a str,
+    redirect: &'a str,
+}
+
+// Verify username and password via gogs.
+async fn verify_login(cfg: &Config, data: &FormData) -> Result<bool> {
+    let mut conn = sqlx::SqliteConnection::connect("/tmp/database.db").await?;
+    let password_sha = data.get_password_sha256()?;
+    let ret = sqlx::query(r#"SELECT 1 FROM "accounts" WHERE "user" = ? AND "password" = ? "#)
+        .bind(data.get_user())
+        .bind(password_sha)
+        .fetch_all(&mut conn)
+        .await?;
+    Ok(ret.len() > 0)
+}
+
+
+// Processing the `authenticate-basic` called by cgit.
+fn cmd_authenticate_basic(
+    matches: &ArgMatches,
+    cfg: Option<Config>,
+) -> Result<()> {
+    unimplemented!()
+}
+
+// Processing the `authenticate-cookie` called by cgit.
+async fn cmd_authenticate_cookie(
+    matches: &ArgMatches<'_>,
+    cfg: Option<Config>,
+) -> Result<bool> {
+    let cookies =  matches.value_of("http-cookie").unwrap_or("");
+
+    if cookies.is_empty() {
+        return Ok(false)
+    }
+
+    let mut conn = redis::Client::open("redis://127.0.0.1/")?;
+
+    for cookie in cookies.split(';').map(|x| x.trim()) {
+        let (key, value) = cookie.split_once('=').unwrap();
+        if key.eq("cgit_auth") {
+            if conn.get::<_, i32>(format!("cgit_auth_{}", value)).is_ok() {
+                return Ok(true)
+            }
+            break
+        }
+    }
+
+    Ok(false)
+}
+
+
+async fn cmd_init(cfg: Option<Config>) -> Result<()> {
+
+
+    // TODO: read database location from configure file
+    let mut conn = sqlx::SqliteConnection::connect("sqlite::memory:").await?;
+
+    let rows = sqlx::query(r#"SELECT name FROM sqlite_master WHERE type='table' AND name=?"#)
+        .bind("auth_meta")
+        .fetch_all(&mut conn)
+        .await?;
+
+    if rows.is_empty() {
+        sqlx::query(database::current::CREATE_TABLES)
+            .execute(&mut conn)
+            .await?;
+    }
+
+    Ok(())
+}
+
+// Processing the `authenticate-post` called by cgit.
+async fn cmd_authenticate_post(
+    matches: &ArgMatches<'_>,
+    cfg: Option<Config>,
+) -> Result<()> {
+    // Load configurations.
+    let cfg = cfg.unwrap_or_default();
+    // Read stdin from upstream.
+    let mut buffer = String::new();
+    stdin().read_to_string(&mut buffer)?;
+    let mut data = datastructures::FormData::new();
+    // Parsing user posted form.
+    let fields = form_urlencoded::parse(buffer.as_bytes());
+    for f in fields {
+        match f.0 {
+            Cow::Borrowed("username") => {
+                data.set_user(f.1.to_string())
+            }
+            Cow::Borrowed("password") => {
+                data.set_password(f.1.to_string())
+            }
+            _ => {}
+        }
+    }
+
+    // Authenticated via gogs.
+    if verify_login(&cfg, &data).await.is_ok() {
+        //let hash = data.hash();
+        //let cgitauth = format!("{}:{}", hash, data.nonce);
+        //let cgitauth_b64 = base64::encode_block(cgitauth.as_bytes());
+        //let path = Path::new(&cfg.cache_dir).join(&hash);
+        //data.to_file(path, true);
+        let cookie = rand_str(COOKIE_LENGTH);
+
+        //let redis = redis_async::client::connect(&SocketAddr::from_str("127.0.0.1:5432").unwrap()).await?;
+        //redis.
+        let mut conn = redis::Client::open("redis://127.0.0.1/")?;
+        conn.set_ex::<_, &str, i32>(format!("cgit_auth_{}", cookie), "1", 600)?;
+
+        let is_secure = matches
+            .value_of("https")
+            .map_or(false, |x| matches!(x, "yes" | "on" | "1"));
+        let domain = matches.value_of("http-host").unwrap_or("*");
+        let location = matches
+            .value_of("current-url")
+            .unwrap_or("/")
+            .split('?')
+            .next()
+            .unwrap();
+        let cookie_suffix = if is_secure { "; secure" } else { "" };
+        println!("Status: 302 Redirect");
+        println!("Cache-Control: no-cache, no-store");
+        println!("Location: {}", location);
+        println!(
+            "Set-Cookie: cgit_auth={}; Domain={}; Max-Age={}; HttpOnly{}",
+            // TODO: use cookie ttl instead
+            //cookie, domain, cfg.cookie_ttl, cookie_suffix
+            cookie, domain, 600, cookie_suffix
+        );
+    } else {
+        println!("Status: 403 Forbidden");
+        println!("Cache-Control: no-cache, no-store");
+    }
+    println!();
+
+
+    Ok(())
+}
+
+
+// Processing the `body` called by cgit.
+async fn cmd_body(matches: &ArgMatches<'_>, _cfg: Option<Config>) {
+    let source = include_str!("authentication_page.html");
+    let handlebars = Handlebars::new();
+    let meta = Meta {
+        action: matches.value_of("login-url").unwrap_or(""),
+        redirect: matches.value_of("current-url").unwrap_or(""),
+    };
+    handlebars
+        .render_template_to_write(source, &meta, std::io::stdout())
+        .unwrap();
+}
+
+// Processing the `body` called by cron.
+fn cmd_expire(_matches: &ArgMatches, cfg: Option<Config>) {
+    unimplemented!();
+}
+
+
+async fn async_main(arg_matches: ArgMatches<'_>, cfg: Config) -> Result<i32>{
+    match arg_matches.subcommand() {
+        ("authenticate-cookie", Some(matches)) => {
+            if cmd_authenticate_cookie(matches, Some(cfg)).await.is_ok() {
+                return Ok(1)
+            }
+        }
+        ("authenticate-post", Some(matches)) => {
+            cmd_authenticate_post(matches, Some(cfg)).await.unwrap();
+        }
+        ("body", Some(matches)) => {
+            cmd_body(matches, Some(cfg)).await;
+        }
+        ("expire", Some(matches)) => {
+            cmd_expire(matches, Some(cfg));
+        }
+        ("init", Some(matches)) => {
+            cmd_init(Some(cfg)).await?;
+        }
+        _ => {}
+    }
+    Ok(0)
+}
+
+
+fn main() -> Result<()>{
+
+    let mut file = OpenOptions::new()
+        .create(true)
+        .append(true)
+        .open("/tmp/output")?;
+    let args = std::env::args().collect::<Vec<String>>().join(" ");
+    //args.push("\n".into());
+    file.write_all(args.as_bytes())?;
+    file.write_all("\n".as_bytes())?;
+    //println!(r#"<meta name="test">"#);
+
+
+    let formatter = Formatter3164 {
+        facility: Facility::LOG_USER,
+        hostname: None,
+        process: "cgit-gogs-auth-filter".into(),
+        pid: process::id() as i32,
+    };
+
+    let logger = syslog::unix(formatter).expect("could not connect to syslog");
+    if let Ok(()) = log::set_boxed_logger(Box::new(BasicLogger::new(logger))) {
+        log::set_max_level(LevelFilter::Debug);
+    }
+
+    // Prints each argument on a separate line
+    for (nth, argument) in env::args().enumerate() {
+        log::debug!("[{}]={}", nth, argument);
+    }
+
+    // Sub-arguments for each command, see cgi defines.
+    let sub_args = &[
+        Arg::with_name("http-cookie").required(true),
+        Arg::with_name("request-method").required(true),
+        Arg::with_name("query-string").required(true),
+        Arg::with_name("http-referer").required(true),
+        Arg::with_name("path-info").required(true),
+        Arg::with_name("http-host").required(true),
+        Arg::with_name("https").required(true),
+        Arg::with_name("repo").required(true),
+        Arg::with_name("page").required(true),
+        Arg::with_name("current-url").required(true),
+        Arg::with_name("login-url").required(true),
+    ];
+
+    let matches = App::new("Simple Authentication Filter for cgit")
+        .version(env!("CARGO_PKG_VERSION"))
+        .subcommand(
+            SubCommand::with_name("authenticate-cookie")
+                .about("Processing authenticated cookie")
+                .args(sub_args),
+        )
+        .subcommand(
+            SubCommand::with_name("authenticate-post")
+                .about("Processing posted username and password")
+                .args(sub_args),
+        )
+        .subcommand(
+            SubCommand::with_name("body")
+                .about("Return the login form")
+                .args(sub_args),
+        )
+        .subcommand(SubCommand::with_name("init").about("Init sqlite database"))
+        //.subcommand(SubCommand::with_name("expire").about("Check and clean all expired cookies"))
+        .get_matches();
+
+    // Load filter configurations
+    let cfg = Config::new();
+
+    let ret = tokio::runtime::Builder::new_current_thread()
+        .enable_all()
+        .build()
+        .unwrap()
+        .block_on(async_main(matches, cfg))?;
+    if ret == 1 {
+        std::process::exit(1);
+    }
+
+    Ok(())
+}
+\ No newline at end of file