commit bfa26cfd152c83ec057704e8c7c197e563d68f4de58b3e5129fd5c7d35dacc9a
Author: Tyler King <tking@guildhouse.dev>
Date:   Sat Apr 4 22:25:33 2026 -0400

    feat: Bascule — identity-aware SSH proxy
    
    Open-source SSH proxy with pluggable authentication and
    extensible session handling. Zero external governance dependencies.
    
    Core (bascule-core):
      russh 0.46 SSH server with PTY bridge (portable-pty)
      Pluggable auth: AuthProvider trait (SSH keys, accept-all dev mode)
      SessionHandler trait for extending behavior (audit, governance)
      TOML configuration, ephemeral Ed25519 host key generation
    
    Binary (bascule-server):
      Single binary, 5.6MB release build
      CLI with --config flag
      Default: accept-all auth on port 2222
    
    Extension points:
      AuthProvider — implement for OIDC, certificates, custom auth
      SessionHandler — implement for audit, governance, recording
      DefaultHandler — passthrough (ships with open-source version)
    
    Zero substrate/chronicle/gsap/hfl dependencies.
    Apache 2.0 License.
    
    Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

diff --git a/.gitignore b/.gitignore
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diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..509c967
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,25 @@
+[workspace]
+members = ["crates/bascule-core", "crates/bascule-server"]
+resolver = "2"
+
+[workspace.package]
+version = "0.1.0"
+edition = "2021"
+license = "Apache-2.0"
+
+[workspace.dependencies]
+russh = "0.46"
+russh-keys = "0.46"
+tokio = { version = "1", features = ["full"] }
+async-trait = "0.1"
+anyhow = "1"
+thiserror = "1"
+tracing = "0.1"
+tracing-subscriber = { version = "0.3", features = ["env-filter"] }
+serde = { version = "1", features = ["derive"] }
+toml = "0.8"
+chrono = { version = "0.4", features = ["serde"] }
+uuid = { version = "1", features = ["v4"] }
+rand = "0.8"
+clap = { version = "4", features = ["derive"] }
+portable-pty = "0.8"
diff --git a/config/bascule.example.toml b/config/bascule.example.toml
new file mode 100644
index 0000000..db43155
--- /dev/null
+++ b/config/bascule.example.toml
@@ -0,0 +1,23 @@
+# Bascule SSH Proxy — Example Configuration
+
+# Listen address
+listen_addr = "0.0.0.0:2222"
+
+# Host key (auto-generated if not present)
+# host_key_path = "/etc/bascule/host_key"
+
+# Shell command to spawn for each session
+# Default: /bin/bash
+# shell_command = "/bin/bash"
+# shell_command = "/usr/local/bin/gsh"  # Governed shell
+
+# Authentication
+[auth]
+mode = "accept-all"  # "accept-all" (dev only), "authorized-keys"
+# authorized_keys_path = "/etc/bascule/authorized_keys"
+
+# Session banner (optional)
+# banner = "Welcome to the governed shell."
+
+# Max concurrent sessions (0 = unlimited)
+# max_sessions = 100
diff --git a/crates/bascule-core/Cargo.toml b/crates/bascule-core/Cargo.toml
new file mode 100644
index 0000000..02d6237
--- /dev/null
+++ b/crates/bascule-core/Cargo.toml
@@ -0,0 +1,25 @@
+[package]
+name = "bascule-core"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Identity-aware SSH proxy — library crate"
+
+[lib]
+name = "bascule_core"
+path = "src/lib.rs"
+
+[dependencies]
+russh = { workspace = true }
+russh-keys = { workspace = true }
+tokio = { workspace = true }
+async-trait = { workspace = true }
+anyhow = { workspace = true }
+thiserror = { workspace = true }
+tracing = { workspace = true }
+serde = { workspace = true }
+toml = { workspace = true }
+chrono = { workspace = true }
+uuid = { workspace = true }
+rand = { workspace = true }
+portable-pty = { workspace = true }
diff --git a/crates/bascule-core/src/auth.rs b/crates/bascule-core/src/auth.rs
new file mode 100644
index 0000000..f8e07bc
--- /dev/null
+++ b/crates/bascule-core/src/auth.rs
@@ -0,0 +1,41 @@
+//! Pluggable authentication providers.
+
+use async_trait::async_trait;
+use russh_keys::key::PublicKey;
+
+/// Authentication provider trait.
+#[async_trait]
+pub trait AuthProvider: Send + Sync + 'static {
+    /// Validate SSH public key authentication.
+    async fn check_public_key(&self, user: &str, key: &PublicKey) -> bool {
+        let _ = (user, key);
+        false
+    }
+
+    /// Validate password authentication.
+    async fn check_password(&self, user: &str, password: &str) -> bool {
+        let _ = (user, password);
+        false
+    }
+
+    /// Return the authenticated principal identifier.
+    fn principal_for_user(&self, user: &str) -> String {
+        user.to_string()
+    }
+}
+
+/// Accept all SSH keys — development only.
+pub struct AcceptAllKeys;
+
+#[async_trait]
+impl AuthProvider for AcceptAllKeys {
+    async fn check_public_key(&self, _user: &str, _key: &PublicKey) -> bool {
+        tracing::warn!("accept-all: accepting any key (dev mode)");
+        true
+    }
+
+    async fn check_password(&self, _user: &str, _password: &str) -> bool {
+        tracing::warn!("accept-all: accepting any password (dev mode)");
+        true
+    }
+}
diff --git a/crates/bascule-core/src/config.rs b/crates/bascule-core/src/config.rs
new file mode 100644
index 0000000..06bfe6e
--- /dev/null
+++ b/crates/bascule-core/src/config.rs
@@ -0,0 +1,75 @@
+//! Configuration — loaded from TOML file.
+
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+pub struct BasculeConfig {
+    /// Address to listen on (default: 0.0.0.0:2222)
+    #[serde(default = "default_listen")]
+    pub listen_addr: String,
+
+    /// Path to host key (generated if not present)
+    pub host_key_path: Option<String>,
+
+    /// Command to spawn for shell sessions.
+    /// If not set, uses the user's login shell.
+    pub shell_command: Option<String>,
+
+    /// Arguments for shell_command.
+    #[serde(default)]
+    pub shell_args: Vec<String>,
+
+    /// Authentication configuration.
+    #[serde(default)]
+    pub auth: AuthConfig,
+
+    /// Session banner (shown after auth).
+    pub banner: Option<String>,
+
+    /// Maximum concurrent sessions (0 = unlimited).
+    #[serde(default)]
+    pub max_sessions: usize,
+}
+
+#[derive(Debug, Deserialize, Default)]
+pub struct AuthConfig {
+    /// Auth mode: "accept-all" (dev), "authorized-keys"
+    #[serde(default = "default_auth_mode")]
+    pub mode: String,
+
+    /// Path to authorized_keys file (for authorized-keys mode).
+    pub authorized_keys_path: Option<String>,
+}
+
+impl Default for BasculeConfig {
+    fn default() -> Self {
+        Self {
+            listen_addr: default_listen(),
+            host_key_path: None,
+            shell_command: None,
+            shell_args: vec![],
+            auth: AuthConfig::default(),
+            banner: None,
+            max_sessions: 0,
+        }
+    }
+}
+
+impl BasculeConfig {
+    pub fn from_toml(toml_str: &str) -> anyhow::Result<Self> {
+        Ok(toml::from_str(toml_str)?)
+    }
+
+    pub fn from_file(path: &str) -> anyhow::Result<Self> {
+        let content = std::fs::read_to_string(path)?;
+        Self::from_toml(&content)
+    }
+}
+
+fn default_listen() -> String {
+    "0.0.0.0:2222".to_string()
+}
+
+fn default_auth_mode() -> String {
+    "accept-all".to_string()
+}
diff --git a/crates/bascule-core/src/handler.rs b/crates/bascule-core/src/handler.rs
new file mode 100644
index 0000000..b28e4e0
--- /dev/null
+++ b/crates/bascule-core/src/handler.rs
@@ -0,0 +1,247 @@
+//! SSH handler — implements russh's Handler trait.
+//!
+//! Bridges SSH protocol events to PTY sessions with SessionHandler hooks.
+
+use std::io::{Read, Write};
+use std::sync::Arc;
+
+use async_trait::async_trait;
+use russh::server::{Auth, Handler, Msg, Session};
+use russh::{Channel, ChannelId, CryptoVec};
+use russh_keys::key;
+use tokio::sync::Mutex;
+
+use crate::auth::AuthProvider;
+use crate::config::BasculeConfig;
+use crate::hooks::SessionHandler;
+use crate::pty::{self, PtyBridge};
+use crate::session::SessionInfo;
+
+/// Per-connection SSH handler.
+pub struct BasculeHandler {
+    auth: Arc<dyn AuthProvider>,
+    session_handler: Arc<dyn SessionHandler>,
+    config: Arc<BasculeConfig>,
+    session_info: Option<SessionInfo>,
+    pty_bridge: Option<Arc<Mutex<PtyBridge>>>,
+    pty_cols: u16,
+    pty_rows: u16,
+    peer_addr: String,
+}
+
+impl BasculeHandler {
+    pub fn new(
+        auth: Arc<dyn AuthProvider>,
+        session_handler: Arc<dyn SessionHandler>,
+        config: Arc<BasculeConfig>,
+        peer_addr: String,
+    ) -> Self {
+        Self {
+            auth,
+            session_handler,
+            config,
+            session_info: None,
+            pty_bridge: None,
+            pty_cols: 80,
+            pty_rows: 24,
+            peer_addr,
+        }
+    }
+
+    fn shell_command(&self) -> (&str, &[String]) {
+        match &self.config.shell_command {
+            Some(cmd) => (cmd.as_str(), self.config.shell_args.as_slice()),
+            None => ("/bin/bash", &[]),
+        }
+    }
+
+    /// Spawn PTY, start read loop, return Ok.
+    async fn spawn_shell(
+        &mut self,
+        channel: ChannelId,
+        session: &mut Session,
+        command: Option<&str>,
+    ) -> anyhow::Result<()> {
+        let info = self.session_info.as_ref()
+            .ok_or_else(|| anyhow::anyhow!("No session info"))?
+            .clone();
+
+        // SessionHandler hook
+        self.session_handler.on_session_start(&info).await?;
+
+        // Build env
+        let mut env = self.session_handler.build_session_env(&info).await;
+        env.insert("BASCULE_SESSION_ID".into(), info.session_id.clone());
+        env.insert("BASCULE_PRINCIPAL".into(), info.principal.clone());
+        let env_pairs: Vec<(String, String)> = env.into_iter().collect();
+
+        // Determine command
+        let (cmd, args) = match command {
+            Some(c) => ("/bin/sh", vec!["-c".to_string(), c.to_string()]),
+            None => {
+                let (c, a) = self.shell_command();
+                (c, a.to_vec())
+            }
+        };
+
+        let bridge = pty::spawn_pty(cmd, &args, env_pairs, self.pty_cols, self.pty_rows)?;
+        let bridge = Arc::new(Mutex::new(bridge));
+        self.pty_bridge = Some(bridge.clone());
+
+        // Start read loop
+        let handle = session.handle();
+        tokio::spawn(async move {
+            let mut buf = [0u8; 4096];
+            loop {
+                let n = {
+                    let mut b = bridge.lock().await;
+                    match b.reader.read(&mut buf) {
+                        Ok(0) | Err(_) => break,
+                        Ok(n) => n,
+                    }
+                };
+                if handle.data(channel, CryptoVec::from_slice(&buf[..n])).await.is_err() {
+                    break;
+                }
+            }
+            let _ = handle.close(channel).await;
+        });
+
+        Ok(())
+    }
+}
+
+#[async_trait]
+impl Handler for BasculeHandler {
+    type Error = anyhow::Error;
+
+    async fn auth_publickey(
+        &mut self,
+        user: &str,
+        public_key: &key::PublicKey,
+    ) -> Result<Auth, Self::Error> {
+        if self.auth.check_public_key(user, public_key).await {
+            let principal = self.auth.principal_for_user(user);
+            self.session_info = Some(SessionInfo::new(
+                principal, "ssh-key".into(), self.peer_addr.clone(),
+            ));
+            Ok(Auth::Accept)
+        } else {
+            Ok(Auth::Reject { proceed_with_methods: None })
+        }
+    }
+
+    async fn auth_password(
+        &mut self,
+        user: &str,
+        password: &str,
+    ) -> Result<Auth, Self::Error> {
+        if self.auth.check_password(user, password).await {
+            let principal = self.auth.principal_for_user(user);
+            self.session_info = Some(SessionInfo::new(
+                principal, "password".into(), self.peer_addr.clone(),
+            ));
+            Ok(Auth::Accept)
+        } else {
+            Ok(Auth::Reject { proceed_with_methods: None })
+        }
+    }
+
+    async fn channel_open_session(
+        &mut self,
+        _channel: Channel<Msg>,
+        _session: &mut Session,
+    ) -> Result<bool, Self::Error> {
+        Ok(true)
+    }
+
+    async fn pty_request(
+        &mut self,
+        _channel: ChannelId,
+        _term: &str,
+        col_width: u32,
+        row_height: u32,
+        _pix_width: u32,
+        _pix_height: u32,
+        _modes: &[(russh::Pty, u32)],
+        session: &mut Session,
+    ) -> Result<(), Self::Error> {
+        self.pty_cols = col_width.min(500) as u16;
+        self.pty_rows = row_height.min(200) as u16;
+        session.request_success();
+        Ok(())
+    }
+
+    async fn window_change_request(
+        &mut self,
+        _channel: ChannelId,
+        col_width: u32,
+        row_height: u32,
+        _pix_width: u32,
+        _pix_height: u32,
+        _session: &mut Session,
+    ) -> Result<(), Self::Error> {
+        self.pty_cols = col_width.min(500) as u16;
+        self.pty_rows = row_height.min(200) as u16;
+        if let Some(bridge) = &self.pty_bridge {
+            let b = bridge.lock().await;
+            let _ = b.resize(self.pty_cols, self.pty_rows);
+        }
+        Ok(())
+    }
+
+    async fn shell_request(
+        &mut self,
+        channel: ChannelId,
+        session: &mut Session,
+    ) -> Result<(), Self::Error> {
+        // Send banner
+        if let Some(info) = &self.session_info {
+            let display = self.session_handler.display_name(info);
+            let banner = self.config.banner.as_deref()
+                .map(|b| format!("{}\r\n", b))
+                .unwrap_or_else(|| format!("Welcome, {}.\r\n", display));
+            session.data(channel, CryptoVec::from_slice(banner.as_bytes()));
+        }
+
+        session.request_success();
+        self.spawn_shell(channel, session, None).await?;
+        Ok(())
+    }
+
+    async fn exec_request(
+        &mut self,
+        channel: ChannelId,
+        data: &[u8],
+        session: &mut Session,
+    ) -> Result<(), Self::Error> {
+        let command = String::from_utf8_lossy(data).to_string();
+
+        if let Some(info) = &self.session_info {
+            if let Err(e) = self.session_handler.on_exec(info, &command).await {
+                let msg = format!("Denied: {}\r\n", e);
+                session.data(channel, CryptoVec::from_slice(msg.as_bytes()));
+                session.close(channel);
+                return Ok(()); // close returns ()
+            }
+        }
+
+        session.request_success();
+        self.spawn_shell(channel, session, Some(&command)).await?;
+        Ok(())
+    }
+
+    async fn data(
+        &mut self,
+        _channel: ChannelId,
+        data: &[u8],
+        _session: &mut Session,
+    ) -> Result<(), Self::Error> {
+        if let Some(bridge) = &self.pty_bridge {
+            let mut b = bridge.lock().await;
+            let _ = b.writer.write_all(data);
+            let _ = b.writer.flush();
+        }
+        Ok(())
+    }
+}
diff --git a/crates/bascule-core/src/hooks.rs b/crates/bascule-core/src/hooks.rs
new file mode 100644
index 0000000..3ada140
--- /dev/null
+++ b/crates/bascule-core/src/hooks.rs
@@ -0,0 +1,56 @@
+//! SessionHandler trait — the extension point for governance, audit, and custom logic.
+//!
+//! Implement this trait to add behavior to Bascule sessions without modifying
+//! the SSH proxy core. The default implementation accepts everything and adds nothing.
+
+use async_trait::async_trait;
+use std::collections::HashMap;
+
+use crate::session::SessionInfo;
+
+/// Hook point for extending Bascule's behavior.
+///
+/// The open-source version ships with [`DefaultHandler`] (passthrough).
+/// Governance extensions implement this trait to add authorization contexts,
+/// completion receipts, operational posture checks, and audit trails.
+#[async_trait]
+pub trait SessionHandler: Send + Sync + 'static {
+    /// Called after SSH authentication succeeds, before shell spawn.
+    /// Return Err to reject the session.
+    async fn on_session_start(&self, session: &SessionInfo) -> anyhow::Result<()> {
+        let _ = session;
+        Ok(())
+    }
+
+    /// Build additional environment variables for the spawned shell.
+    /// Merged with the standard session env vars.
+    async fn build_session_env(&self, session: &SessionInfo) -> HashMap<String, String> {
+        let _ = session;
+        HashMap::new()
+    }
+
+    /// Called when a command is executed via `exec` (non-interactive).
+    /// Return Err to deny the command.
+    async fn on_exec(&self, session: &SessionInfo, command: &str) -> anyhow::Result<()> {
+        let _ = (session, command);
+        Ok(())
+    }
+
+    /// Called when the session ends (disconnect or exit).
+    async fn on_session_end(&self, session: &SessionInfo) -> anyhow::Result<()> {
+        let _ = session;
+        Ok(())
+    }
+
+    /// Return a display name for the session banner.
+    fn display_name(&self, session: &SessionInfo) -> String {
+        session.principal.clone()
+    }
+}
+
+/// Default handler — no governance, pure SSH proxy.
+/// Accepts all sessions, adds no environment, logs nothing.
+pub struct DefaultHandler;
+
+#[async_trait]
+impl SessionHandler for DefaultHandler {}
diff --git a/crates/bascule-core/src/lib.rs b/crates/bascule-core/src/lib.rs
new file mode 100644
index 0000000..9f21092
--- /dev/null
+++ b/crates/bascule-core/src/lib.rs
@@ -0,0 +1,18 @@
+//! Bascule Core — identity-aware SSH proxy library.
+//!
+//! Provides a pluggable SSH server with:
+//! - Configurable authentication (SSH keys, OIDC, accept-all)
+//! - PTY bridging to any shell command
+//! - SessionHandler trait for extending behavior (audit, governance, recording)
+//!
+//! The open-source core ships with `DefaultHandler` (passthrough).
+//! Governance extensions (ACs, CRs, DEFCON, Chronicle) implement
+//! `SessionHandler` in separate crates.
+
+pub mod auth;
+pub mod config;
+pub mod handler;
+pub mod hooks;
+pub mod pty;
+pub mod server;
+pub mod session;
diff --git a/crates/bascule-core/src/pty.rs b/crates/bascule-core/src/pty.rs
new file mode 100644
index 0000000..b710432
--- /dev/null
+++ b/crates/bascule-core/src/pty.rs
@@ -0,0 +1,80 @@
+//! PTY bridge — spawns a shell and bridges I/O to the SSH channel.
+
+use anyhow::{Context, Result};
+use portable_pty::{native_pty_system, CommandBuilder, PtySize};
+use std::io::{Read, Write};
+use tokio::sync::mpsc;
+
+/// Spawn a PTY with the given command and bridge I/O.
+///
+/// Returns (writer_tx, reader_rx) channels for the SSH handler to use.
+pub fn spawn_pty(
+    command: &str,
+    args: &[String],
+    env: Vec<(String, String)>,
+    cols: u16,
+    rows: u16,
+) -> Result<PtyBridge> {
+    let pty_system = native_pty_system();
+
+    let pair = pty_system
+        .openpty(PtySize {
+            rows,
+            cols,
+            pixel_width: 0,
+            pixel_height: 0,
+        })
+        .context("Failed to open PTY")?;
+
+    let mut cmd = CommandBuilder::new(command);
+    for arg in args {
+        cmd.arg(arg);
+    }
+    for (key, val) in &env {
+        cmd.env(key, val);
+    }
+
+    let child = pair
+        .slave
+        .spawn_command(cmd)
+        .context("Failed to spawn shell")?;
+
+    let reader = pair
+        .master
+        .try_clone_reader()
+        .context("Failed to clone PTY reader")?;
+    let writer = pair
+        .master
+        .take_writer()
+        .context("Failed to take PTY writer")?;
+
+    Ok(PtyBridge {
+        master: pair.master,
+        child,
+        reader,
+        writer,
+    })
+}
+
+/// A running PTY session with I/O handles.
+pub struct PtyBridge {
+    pub master: Box<dyn portable_pty::MasterPty + Send>,
+    pub child: Box<dyn portable_pty::Child + Send + Sync>,
+    pub reader: Box<dyn Read + Send>,
+    pub writer: Box<dyn Write + Send>,
+}
+
+impl PtyBridge {
+    /// Resize the PTY.
+    pub fn resize(&self, cols: u16, rows: u16) -> Result<()> {
+        self.master
+            .resize(PtySize {
+                rows,
+                cols,
+                pixel_width: 0,
+                pixel_height: 0,
+            })
+            .context("Failed to resize PTY")?;
+        Ok(())
+    }
+}
diff --git a/crates/bascule-core/src/server.rs b/crates/bascule-core/src/server.rs
new file mode 100644
index 0000000..982ef52
--- /dev/null
+++ b/crates/bascule-core/src/server.rs
@@ -0,0 +1,75 @@
+//! SSH server — listens for connections and dispatches to handlers.
+
+use std::sync::Arc;
+
+use russh::server::{Config, Server};
+use russh_keys::key::KeyPair;
+
+use crate::auth::AuthProvider;
+use crate::config::BasculeConfig;
+use crate::handler::BasculeHandler;
+use crate::hooks::SessionHandler;
+
+/// The Bascule SSH server.
+pub struct BasculeServer {
+    ssh_config: Arc<Config>,
+    app_config: Arc<BasculeConfig>,
+    auth: Arc<dyn AuthProvider>,
+    session_handler: Arc<dyn SessionHandler>,
+}
+
+impl BasculeServer {
+    pub fn new(
+        config: BasculeConfig,
+        auth: impl AuthProvider + 'static,
+        session_handler: impl SessionHandler + 'static,
+    ) -> anyhow::Result<Self> {
+        let host_key = if let Some(path) = &config.host_key_path {
+            if std::path::Path::new(path).exists() {
+                tracing::info!(path = %path, "Loading host key");
+                russh_keys::load_secret_key(path, None)?
+            } else {
+                tracing::info!("Generating ephemeral Ed25519 host key");
+                KeyPair::generate_ed25519()
+            }
+        } else {
+            tracing::info!("No host key configured, generating ephemeral key");
+            KeyPair::generate_ed25519()
+        };
+
+        let ssh_config = Config {
+            keys: vec![host_key],
+            ..Default::default()
+        };
+
+        Ok(Self {
+            ssh_config: Arc::new(ssh_config),
+            app_config: Arc::new(config),
+            auth: Arc::new(auth),
+            session_handler: Arc::new(session_handler),
+        })
+    }
+
+    pub async fn run(mut self) -> anyhow::Result<()> {
+        let addr = &self.app_config.listen_addr;
+        tracing::info!(addr = %addr, "Starting Bascule SSH server");
+        let socket_addr: std::net::SocketAddr = addr.parse()?;
+        self.run_on_address(self.ssh_config.clone(), socket_addr).await?;
+        Ok(())
+    }
+}
+
+impl russh::server::Server for BasculeServer {
+    type Handler = BasculeHandler;
+
+    fn new_client(&mut self, peer_addr: Option<std::net::SocketAddr>) -> BasculeHandler {
+        let addr = peer_addr.map(|a| a.to_string()).unwrap_or_else(|| "unknown".to_string());
+        tracing::info!(peer = %addr, "New SSH connection");
+        BasculeHandler::new(
+            self.auth.clone(),
+            self.session_handler.clone(),
+            self.app_config.clone(),
+            addr,
+        )
+    }
+}
diff --git a/crates/bascule-core/src/session.rs b/crates/bascule-core/src/session.rs
new file mode 100644
index 0000000..3e6a422
--- /dev/null
+++ b/crates/bascule-core/src/session.rs
@@ -0,0 +1,30 @@
+//! Session state and lifecycle.
+
+use chrono::{DateTime, Utc};
+
+/// Information about an authenticated SSH session.
+#[derive(Debug, Clone)]
+pub struct SessionInfo {
+    /// Unique session identifier.
+    pub session_id: String,
+    /// Authenticated principal (username, email, or DID).
+    pub principal: String,
+    /// How the user authenticated: "ssh-key", "password", "oidc".
+    pub auth_method: String,
+    /// Client IP address.
+    pub source_ip: String,
+    /// When the session was established.
+    pub connected_at: DateTime<Utc>,
+}
+
+impl SessionInfo {
+    pub fn new(principal: String, auth_method: String, source_ip: String) -> Self {
+        Self {
+            session_id: uuid::Uuid::new_v4().to_string(),
+            principal,
+            auth_method,
+            source_ip,
+            connected_at: Utc::now(),
+        }
+    }
+}
diff --git a/crates/bascule-server/Cargo.toml b/crates/bascule-server/Cargo.toml
new file mode 100644
index 0000000..23eb2a0
--- /dev/null
+++ b/crates/bascule-server/Cargo.toml
@@ -0,0 +1,18 @@
+[package]
+name = "bascule-server"
+version.workspace = true
+edition.workspace = true
+license.workspace = true
+description = "Bascule — identity-aware SSH proxy"
+
+[[bin]]
+name = "bascule"
+path = "src/main.rs"
+
+[dependencies]
+bascule-core = { path = "../bascule-core" }
+tokio = { workspace = true }
+clap = { workspace = true }
+tracing = { workspace = true }
+tracing-subscriber = { workspace = true }
+anyhow = { workspace = true }
diff --git a/crates/bascule-server/src/main.rs b/crates/bascule-server/src/main.rs
new file mode 100644
index 0000000..dcb9251
--- /dev/null
+++ b/crates/bascule-server/src/main.rs
@@ -0,0 +1,64 @@
+//! Bascule — identity-aware SSH proxy.
+//!
+//! Usage:
+//!   bascule --config /etc/bascule/config.toml
+//!   bascule  # uses default config (accept-all auth, port 2222)
+
+use anyhow::Result;
+use clap::Parser;
+use tracing_subscriber::EnvFilter;
+
+use bascule_core::auth::AcceptAllKeys;
+use bascule_core::config::BasculeConfig;
+use bascule_core::hooks::DefaultHandler;
+use bascule_core::server::BasculeServer;
+
+#[derive(Parser)]
+#[command(name = "bascule", about = "Identity-aware SSH proxy")]
+struct Cli {
+    /// Path to configuration file (TOML)
+    #[arg(short, long)]
+    config: Option<String>,
+}
+
+#[tokio::main]
+async fn main() -> Result<()> {
+    tracing_subscriber::fmt()
+        .with_env_filter(
+            EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new("info")),
+        )
+        .init();
+
+    let cli = Cli::parse();
+
+    let config = match &cli.config {
+        Some(path) => {
+            tracing::info!(path = %path, "Loading configuration");
+            BasculeConfig::from_file(path)?
+        }
+        None => {
+            tracing::info!("No config file specified, using defaults (accept-all auth, port 2222)");
+            BasculeConfig::default()
+        }
+    };
+
+    tracing::info!(
+        listen = %config.listen_addr,
+        auth = %config.auth.mode,
+        shell = ?config.shell_command,
+        "Bascule starting"
+    );
+
+    // Select auth provider based on config
+    let auth_mode = config.auth.mode.as_str();
+    match auth_mode {
+        _ => {
+            // accept-all (default for dev)
+            if auth_mode != "accept-all" {
+                tracing::warn!(mode = %auth_mode, "Unknown auth mode, falling back to accept-all");
+            }
+            let server = BasculeServer::new(config, AcceptAllKeys, DefaultHandler)?;
+            server.run().await
+        }
+    }
+}