From 9dc9210e853305f2f4e25cd9fba57d8fced16966 Mon Sep 17 00:00:00 2001
From: Himadri Bhattacharjee <107522312+lavafroth@users.noreply.github.com>
Date: Tue, 18 Mar 2025 22:01:02 +0530
Subject: [PATCH] init: initial commit

---
 .envrc      |    1 +
 .gitignore  |    2 +
 Cargo.lock  | 1996 +++++++++++++++++++++++++++++++++++++++++++++++++++
 Cargo.toml  |   11 +
 LICENSE     |   22 +
 flake.lock  |   57 ++
 flake.nix   |   27 +
 src/main.rs |  204 ++++++
 8 files changed, 2320 insertions(+)
 create mode 100644 .envrc
 create mode 100644 .gitignore
 create mode 100644 Cargo.lock
 create mode 100644 Cargo.toml
 create mode 100644 LICENSE
 create mode 100644 flake.lock
 create mode 100644 flake.nix
 create mode 100644 src/main.rs

diff --git a/.envrc b/.envrc
new file mode 100644
index 0000000..3550a30
--- /dev/null
+++ b/.envrc
@@ -0,0 +1 @@
+use flake
diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..2d5df85
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,2 @@
+/target
+.direnv
diff --git a/Cargo.lock b/Cargo.lock
new file mode 100644
index 0000000..f9e415d
--- /dev/null
+++ b/Cargo.lock
@@ -0,0 +1,1996 @@
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+ "windows_aarch64_gnullvm",
+ "windows_aarch64_msvc",
+ "windows_i686_gnu",
+ "windows_i686_gnullvm",
+ "windows_i686_msvc",
+ "windows_x86_64_gnu",
+ "windows_x86_64_gnullvm",
+ "windows_x86_64_msvc",
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+ "zerocopy-derive",
+]
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+[[package]]
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+ "proc-macro2",
+ "quote",
+ "syn",
+]
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+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..a768f61
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "publik"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+env_logger = "0.11.7"
+log = "0.4.26"
+russh = "0.51.1"
+thiserror = "2.0.12"
+tokio = "1.44.1"
diff --git a/LICENSE b/LICENSE
new file mode 100644
index 0000000..7dbdd3b
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,22 @@
+MIT License
+
+Copyright (c) 2025 Himadri Bhattacharjee
+
+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/flake.lock b/flake.lock
new file mode 100644
index 0000000..9d7bb02
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,57 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 0,
+        "narHash": "sha256-C7jVfohcGzdZRF6DO+ybyG/sqpo1h6bZi9T56sxLy+k=",
+        "path": "/nix/store/alzxn3hjisc84hrlv44x6hni48crww26-source",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}
diff --git a/flake.nix b/flake.nix
new file mode 100644
index 0000000..e9fc35b
--- /dev/null
+++ b/flake.nix
@@ -0,0 +1,27 @@
+{
+  description = "devshell for github:lavafroth/sweet";
+
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+
+  outputs =
+    {
+      self,
+      nixpkgs,
+      flake-utils,
+    }:
+    flake-utils.lib.eachDefaultSystem (
+      system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in
+      {
+        devShells.default = pkgs.mkShell rec {
+          packages = with pkgs; [
+            stdenv.cc.cc.lib
+          ];
+
+          LD_LIBRARY_PATH = "${nixpkgs.lib.makeLibraryPath packages}";
+        };
+      }
+    );
+}
diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..0a9b112
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,204 @@
+use std::collections::HashMap;
+use std::io::{BufRead, BufReader};
+use std::path::Path;
+use std::sync::Arc;
+
+use russh::keys::{PublicKey, ssh_key, ssh_key::rand_core::OsRng};
+use russh::server::{self, Msg, Server as _, Session};
+use russh::{Channel, ChannelId, CryptoVec};
+use thiserror::Error;
+use tokio::sync::Mutex;
+
+#[tokio::main]
+async fn main() {
+    env_logger::builder()
+        .filter_level(log::LevelFilter::Debug)
+        .init();
+
+    let mut methods = russh::MethodSet::empty();
+    methods.push(russh::MethodKind::PublicKey);
+
+    let keychain = read_authfile(Path::new("./authfile")).await.unwrap();
+
+    let config = russh::server::Config {
+        inactivity_timeout: Some(std::time::Duration::from_secs(3600)),
+        auth_rejection_time: std::time::Duration::from_secs(3),
+        auth_rejection_time_initial: Some(std::time::Duration::from_secs(0)),
+        methods,
+        keys: vec![
+            russh::keys::PrivateKey::random(&mut OsRng, russh::keys::Algorithm::Ed25519).unwrap(),
+        ],
+        ..Default::default()
+    };
+    let config = Arc::new(config);
+    let mut sh = Server {
+        keychain,
+        clients: Arc::new(Mutex::new(HashMap::new())),
+        id: 0,
+        user_map: Arc::new(Mutex::new(HashMap::default())),
+    };
+    sh.run_on_address(config, ("0.0.0.0", 2222)).await.unwrap();
+}
+
+#[derive(Error, Debug)]
+pub enum AuthFileError {
+    #[error("unable to read authorization file")]
+    FileNotReadable(#[from] std::io::Error),
+    #[error("failed to parse public key")]
+    PublicKeyParsingError(#[from] russh::keys::ssh_key::Error),
+    #[error("invalid role specified in authorization file at line: {0}")]
+    InvalidRole(String),
+}
+
+#[derive(Clone, Debug)]
+pub enum Role {
+    Normal,
+    Super,
+}
+
+#[derive(Clone)]
+pub struct AuthorizedEntity {
+    name: String,
+    role: Role,
+    key: PublicKey,
+}
+
+async fn read_authfile(path: &Path) -> Result<Vec<Arc<AuthorizedEntity>>, AuthFileError> {
+    let handle = std::fs::File::open(path)?;
+    let reader = BufReader::new(handle);
+    let mut keys = vec![];
+    for line in reader.lines() {
+        let line = line?;
+        let key = PublicKey::from_openssh(&line)?;
+
+        let comment = key.comment();
+        let (name, role) = match comment.rsplit_once(":") {
+            Some((name, "admin")) => (name, Role::Super),
+            None => (comment, Role::Normal),
+            _ => {
+                return Err(AuthFileError::InvalidRole(comment.to_string()));
+            }
+        };
+
+        let authorized_entity = AuthorizedEntity {
+            name: name.to_string(),
+            role,
+            key,
+        };
+        keys.push(authorized_entity.into());
+    }
+    Ok(keys)
+}
+
+#[derive(Clone)]
+struct Server {
+    keychain: Vec<Arc<AuthorizedEntity>>,
+    clients: Arc<Mutex<HashMap<usize, (ChannelId, russh::server::Handle)>>>,
+    user_map: Arc<Mutex<HashMap<usize, Arc<AuthorizedEntity>>>>,
+    id: usize,
+}
+
+impl Server {
+    async fn post(&mut self, data: CryptoVec) {
+        let mut clients = self.clients.lock().await;
+        for (id, (channel, s)) in clients.iter_mut() {
+            if *id != self.id {
+                let _ = s.data(*channel, data.clone()).await;
+            }
+        }
+    }
+
+    async fn entity(&mut self) -> Arc<AuthorizedEntity> {
+        self.user_map.lock().await.get(&self.id).cloned().unwrap()
+    }
+
+    async fn announce(&mut self) {
+        let entity = self.entity().await;
+        let data = CryptoVec::from(format!(
+            "{} with {:?} privileges has joined the lounge\r\n",
+            entity.name, entity.role
+        ));
+        self.post(data.clone()).await;
+    }
+}
+
+impl server::Server for Server {
+    type Handler = Self;
+    fn new_client(&mut self, _: Option<std::net::SocketAddr>) -> Self {
+        let s = self.clone();
+        self.id += 1;
+        s
+    }
+    fn handle_session_error(&mut self, _error: <Self::Handler as russh::server::Handler>::Error) {
+        eprintln!("Session error: {:#?}", _error);
+    }
+}
+
+impl server::Handler for Server {
+    type Error = russh::Error;
+
+    async fn channel_open_session(
+        &mut self,
+        channel: Channel<Msg>,
+        session: &mut Session,
+    ) -> Result<bool, Self::Error> {
+        {
+            let mut clients = self.clients.lock().await;
+            clients.insert(self.id, (channel.id(), session.handle()));
+        }
+        self.announce().await;
+        Ok(true)
+    }
+
+    async fn auth_publickey(
+        &mut self,
+        _: &str,
+        key: &ssh_key::PublicKey,
+    ) -> Result<server::Auth, Self::Error> {
+        // Search for the key in our keychain
+        if let Some(entity) = self
+            .keychain
+            .iter()
+            .find(|entity| entity.key.key_data() == key.key_data())
+        {
+            {
+                let mut user_map = self.user_map.lock().await;
+                user_map.insert(self.id, entity.clone());
+            }
+            return Ok(server::Auth::Accept);
+        }
+        Ok(server::Auth::reject())
+    }
+
+    async fn data(
+        &mut self,
+        channel: ChannelId,
+        data: &[u8],
+        session: &mut Session,
+    ) -> Result<(), Self::Error> {
+        // Sending Ctrl+C ends the session and disconnects the client
+        if data == [3] {
+            return Err(russh::Error::Disconnect);
+        }
+
+        let data = CryptoVec::from(format!(
+            "[{}]: {}\r\n",
+            self.entity().await.name,
+            String::from_utf8_lossy(data)
+        ));
+        self.post(data.clone()).await;
+        session.data(channel, data)?;
+        Ok(())
+    }
+}
+
+impl Drop for Server {
+    fn drop(&mut self) {
+        let id = self.id;
+        let clients = self.clients.clone();
+        tokio::spawn(async move {
+            let mut clients = clients.lock().await;
+            clients.remove(&id);
+        });
+    }
+}