`65bfaf5`

seed sprint one scaffold

Authored by mfwolffe <wolffemf@dukes.jmu.edu> 2 months ago

SHA: 65bfaf5b76ed5b63c8c44726ce5810b17dd46da7
Tree: 753e1d5

16 changed files

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A	`garcard/src/config.rs`	209
A	`garcard/src/daemon.rs`	278
A	`garcard/src/main.rs`	56
A	`garcard/src/state.rs`	135
A	`garcardctl/Cargo.toml`	13
A	`garcardctl/src/main.rs`	79

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1744 lines changed — click to load

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++
 +[workspace.package]
 +version = "0.1.0"
 +edition = "2024"
 +license = "MIT"
 +authors = ["gardesk contributors"]
++
 +[workspace.dependencies]
 +garcard-ipc = { path = "garcard-ipc" }
++
 +anyhow = "1"
 +clap = { version = "4", features = ["derive"] }
 +serde = { version = "1", features = ["derive"] }
 +serde_json = "1"
 +tokio = { version = "1", features = ["full", "signal"] }
 +tracing = "0.1"
 +tracing-subscriber = { version = "0.3", features = ["env-filter"] }
 +dirs = "5"
 +toml = "0.8"
 +zbus = "4"
 +nix = { version = "0.29", features = ["user"] }

README.mdadded

 +# garcard
++
 +`garcard` is the in-progress Polkit authentication agent for the gar desktop suite.
++
 +## Workspace
 +1. `garcard`: daemon runtime
 +2. `garcard-ipc`: shared protocol types
 +3. `garcardctl`: control/debug CLI
++
 +## Quick Start
 +1. `cargo run -p garcard -- daemon`
 +2. `cargo run -p garcardctl -- status`
++
 +## Config
 +Default config path: `~/.config/garcard/config.toml`
++
 +Environment overrides:
 +1. `GARCARD_SOCKET`
 +2. `GARCARD_SOCKET_MODE`
 +3. `GARCARD_CONFIG`
 +4. `GARCARD_AGENT_BACKEND`
 +5. `GARCARD_POLKIT_OBJECT_PATH`
 +6. `GARCARD_LOCALE`
++
 +See `examples/config.toml` for a starter file.

examples/config.tomladded

 +# garcard example configuration
++
 +# Optional explicit socket path.
 +# socket_path = "/tmp/garcard.sock"
++
 +# Socket mode in octal string form.
 +# Typical values:
 +# - 600: owner read/write
 +# - 660: owner/group read/write
 +socket_mode = "600"
++
 +# Backend mode:
 +# - auto: try polkit, then fall back to stub if unavailable
 +# - polkit: require polkit backend registration
 +# - stub: run with local stub backend (dev/test only)
 +agent_backend = "auto"
++
 +# Polkit registration object path.
 +polkit_object_path = "/org/gardesk/Garcard/AuthAgent"
++
 +# Locale sent to polkit authority registration.
 +locale = "en_US.UTF-8"

garcard-ipc/Cargo.tomladded

 +[package]
 +name = "garcard-ipc"
 +version.workspace = true
 +edition.workspace = true
 +license.workspace = true
 +authors.workspace = true
++
 +[dependencies]
 +serde.workspace = true
 +serde_json.workspace = true

garcard-ipc/src/lib.rsadded

 +//! Shared IPC types for garcard daemon and control clients.
++
 +use serde::{Deserialize, Serialize};
 +use serde_json::Value;
 +use std::ffi::OsString;
 +use std::os::unix::net::UnixListener;
 +use std::path::PathBuf;
 +use std::time::{SystemTime, UNIX_EPOCH};
++
 +/// Protocol version for compatibility checks.
 +pub const PROTOCOL_VERSION: u32 = 1;
++
 +/// Runtime socket filename.
 +pub const SOCKET_BASENAME: &str = "garcard.sock";
++
 +/// Commands accepted by garcard daemon.
 +#[derive(Debug, Clone, Serialize, Deserialize)]
 +#[serde(tag = "command", rename_all = "snake_case")]
 +pub enum Command {
 +    Ping,
 +    Status,
 +    Version,
 +    AuthSummary,
 +    Quit,
 +}
++
 +/// Standard daemon response envelope.
 +#[derive(Debug, Clone, Serialize, Deserialize)]
 +pub struct Response {
 +    pub success: bool,
 +    #[serde(skip_serializing_if = "Option::is_none")]
 +    pub data: Option<Value>,
 +    #[serde(skip_serializing_if = "Option::is_none")]
 +    pub error: Option<String>,
 +}
++
 +impl Response {
 +    pub fn ok() -> Self {
 +        Self {
 +            success: true,
 +            data: None,
 +            error: None,
 +        }
 +    }
++
 +    pub fn ok_with_data(data: impl Serialize) -> Self {
 +        Self {
 +            success: true,
 +            data: serde_json::to_value(data).ok(),
 +            error: None,
 +        }
 +    }
++
 +    pub fn err(message: impl Into<String>) -> Self {
 +        Self {
 +            success: false,
 +            data: None,
 +            error: Some(message.into()),
 +        }
 +    }
 +}
++
 +/// Minimal health and runtime status summary.
 +#[derive(Debug, Clone, Serialize, Deserialize)]
 +pub struct StatusData {
 +    pub running: bool,
 +    pub pid: u32,
 +    pub uptime_secs: u64,
 +    pub version: String,
 +    pub protocol_version: u32,
 +    pub socket_path: String,
 +    pub agent_backend: String,
 +}
++
 +/// Version handshake payload.
 +#[derive(Debug, Clone, Serialize, Deserialize)]
 +pub struct VersionData {
 +    pub component: String,
 +    pub version: String,
 +    pub protocol_version: u32,
 +}
++
 +/// Auth workflow summary with no sensitive data.
 +#[derive(Debug, Clone, Serialize, Deserialize)]
 +pub struct AuthSummary {
 +    pub state: String,
 +    pub active_requests: usize,
 +    pub queued_requests: usize,
 +}
++
 +/// Resolve the daemon socket path from `XDG_RUNTIME_DIR` with `/tmp` fallback.
 +pub fn socket_path() -> PathBuf {
 +    if let Some(explicit) = std::env::var_os("GARCARD_SOCKET") {
 +        return PathBuf::from(explicit);
 +    }
++
 +    let runtime_dir = std::env::var_os("XDG_RUNTIME_DIR");
 +    if runtime_dir.as_ref().is_some_and(runtime_dir_is_usable) {
 +        return socket_path_from_runtime_dir(runtime_dir);
 +    }
++
 +    socket_path_from_runtime_dir(None)
 +}
++
 +/// Build socket path from an explicit runtime dir value.
 +pub fn socket_path_from_runtime_dir(runtime_dir: Option<OsString>) -> PathBuf {
 +    match runtime_dir {
 +        Some(dir) => PathBuf::from(dir).join(SOCKET_BASENAME),
 +        None => PathBuf::from("/tmp").join(SOCKET_BASENAME),
 +    }
 +}
++
 +/// Check if we can create a socket in runtime dir.
 +///
 +/// In sandboxed environments, `XDG_RUNTIME_DIR` can exist but still reject
 +/// socket creation. We probe with a unique temporary socket path so caller
 +/// code can safely fall back to `/tmp`.
 +fn runtime_dir_is_usable(runtime_dir: &OsString) -> bool {
 +    let base = PathBuf::from(runtime_dir);
 +    let timestamp = SystemTime::now()
 +        .duration_since(UNIX_EPOCH)
 +        .ok()
 +        .map(|d| d.as_nanos())
 +        .unwrap_or(0);
 +    let probe = base.join(format!(
 +        ".garcard-probe-{}-{}.sock",
 +        std::process::id(),
 +        timestamp
 +    ));
++
 +    match UnixListener::bind(&probe) {
 +        Ok(listener) => {
 +            drop(listener);
 +            let _ = std::fs::remove_file(&probe);
 +            true
 +        }
 +        Err(_) => false,
 +    }
 +}
++
 +#[cfg(test)]
 +mod tests {
 +    use super::*;
++
 +    #[test]
 +    fn command_round_trip() {
 +        let cmd = Command::AuthSummary;
 +        let encoded = serde_json::to_string(&cmd).expect("encode command");
 +        let decoded: Command = serde_json::from_str(&encoded).expect("decode command");
 +        assert!(matches!(decoded, Command::AuthSummary));
 +    }
++
 +    #[test]
 +    fn socket_path_falls_back_to_tmp() {
 +        let path = socket_path_from_runtime_dir(None);
 +        assert_eq!(path, PathBuf::from("/tmp/garcard.sock"));
 +    }
++
 +    #[test]
 +    fn socket_path_uses_runtime_dir() {
 +        let path = socket_path_from_runtime_dir(Some(OsString::from("/run/user/1000")));
 +        assert_eq!(path, PathBuf::from("/run/user/1000/garcard.sock"));
 +    }
 +}

garcard.serviceadded

 +[Unit]
 +Description=garcard polkit auth agent
 +Documentation=https://github.com/gardesk/gardesk
 +After=graphical-session.target
 +PartOf=graphical-session.target
++
 +[Service]
 +Type=simple
 +ExecStart=garcard daemon
 +Restart=on-failure
 +RestartSec=2
++
 +[Install]
 +WantedBy=graphical-session.target

garcard/Cargo.tomladded

 +[package]
 +name = "garcard"
 +version.workspace = true
 +edition.workspace = true
 +license.workspace = true
 +authors.workspace = true
++
 +[dependencies]
 +garcard-ipc.workspace = true
++
 +anyhow.workspace = true
 +clap.workspace = true
 +serde_json.workspace = true
 +tokio.workspace = true
 +tracing.workspace = true
 +tracing-subscriber.workspace = true
 +dirs.workspace = true
 +toml.workspace = true
 +serde.workspace = true
 +zbus.workspace = true
 +nix.workspace = true

garcard/src/agent.rsadded

 +use anyhow::Result;
 +use std::collections::HashMap;
 +use zbus::blocking::{Connection, Proxy};
 +use zbus::zvariant::{OwnedObjectPath, OwnedValue};
++
 +/// Backend interface for Polkit agent integration.
 +pub trait AuthAgentBackend {
 +    fn name(&self) -> &'static str;
 +    fn register(&mut self) -> Result<()>;
 +    fn unregister(&mut self) -> Result<()>;
 +}
++
 +/// Placeholder backend used during Sprint 01 scaffolding.
 +#[derive(Default)]
 +pub struct StubPolkitAgent;
++
 +impl AuthAgentBackend for StubPolkitAgent {
 +    fn name(&self) -> &'static str {
 +        "stub-polkit-agent"
 +    }
++
 +    fn register(&mut self) -> Result<()> {
 +        tracing::info!("Registered stub auth-agent backend");
 +        Ok(())
 +    }
++
 +    fn unregister(&mut self) -> Result<()> {
 +        tracing::info!("Unregistered stub auth-agent backend");
 +        Ok(())
 +    }
 +}
++
 +/// Runtime configuration for the real Polkit backend.
 +#[derive(Debug, Clone)]
 +pub struct PolkitBackendConfig {
 +    pub object_path: String,
 +    pub locale: String,
 +}
++
 +type Subject = (String, HashMap<String, OwnedValue>);
++
 +/// Real Polkit backend scaffold based on org.freedesktop.PolicyKit1 APIs.
 +///
 +/// This registers/unregisters an authentication agent with the authority.
 +/// The request handling object is the next implementation phase.
 +pub struct PolkitAgent {
 +    object_path: OwnedObjectPath,
 +    locale: String,
 +    subject: Subject,
 +    connection: Option<Connection>,
 +    registered: bool,
 +}
++
 +impl PolkitAgent {
 +    pub fn new(config: PolkitBackendConfig) -> Result<Self> {
 +        let object_path = OwnedObjectPath::try_from(config.object_path)
 +            .map_err(|err| anyhow::anyhow!("invalid polkit object path: {}", err))?;
++
 +        Ok(Self {
 +            object_path,
 +            locale: config.locale,
 +            subject: build_subject(),
 +            connection: None,
 +            registered: false,
 +        })
 +    }
++
 +    fn proxy(connection: &Connection) -> Result<Proxy<'_>> {
 +        let proxy = Proxy::new(
 +            connection,
 +            "org.freedesktop.PolicyKit1",
 +            "/org/freedesktop/PolicyKit1/Authority",
 +            "org.freedesktop.PolicyKit1.Authority",
 +        )?;
 +        Ok(proxy)
 +    }
 +}
++
 +impl AuthAgentBackend for PolkitAgent {
 +    fn name(&self) -> &'static str {
 +        "polkit"
 +    }
++
 +    fn register(&mut self) -> Result<()> {
 +        if self.registered {
 +            return Ok(());
 +        }
++
 +        let connection = Connection::system()?;
 +        {
 +            let proxy = Self::proxy(&connection)?;
 +            let _: () = proxy.call(
 +                "RegisterAuthenticationAgent",
 +                &(
 +                    &self.subject,
 +                    self.locale.as_str(),
 +                    self.object_path.clone(),
 +                ),
 +            )?;
 +        }
++
 +        self.connection = Some(connection);
 +        self.registered = true;
 +        tracing::info!(
 +            backend = self.name(),
 +            "Registered polkit authentication agent"
 +        );
 +        Ok(())
 +    }
++
 +    fn unregister(&mut self) -> Result<()> {
 +        if !self.registered {
 +            return Ok(());
 +        }
++
 +        if let Some(connection) = &self.connection {
 +            match Self::proxy(connection)?.call::<_, _, ()>(
 +                "UnregisterAuthenticationAgent",
 +                &(
 +                    &self.subject,
 +                    self.locale.as_str(),
 +                    self.object_path.clone(),
 +                ),
 +            ) {
 +                Ok(()) => {
 +                    tracing::info!(
 +                        backend = self.name(),
 +                        "Unregistered polkit authentication agent"
 +                    );
 +                }
 +                Err(err) => {
 +                    tracing::warn!(error = %err, "Failed to unregister polkit authentication agent");
 +                }
 +            }
 +        }
++
 +        self.registered = false;
 +        self.connection = None;
 +        Ok(())
 +    }
 +}
++
 +fn build_subject() -> Subject {
 +    let mut details = HashMap::new();
 +    details.insert("pid".to_string(), OwnedValue::from(std::process::id()));
 +    details.insert(
 +        "uid".to_string(),
 +        OwnedValue::from(nix::unistd::geteuid().as_raw()),
 +    );
 +    ("unix-process".to_string(), details)
 +}
++
 +#[cfg(test)]
 +mod tests {
 +    use super::*;
++
 +    #[test]
 +    fn polkit_agent_rejects_invalid_object_path() {
 +        let result = PolkitAgent::new(PolkitBackendConfig {
 +            object_path: "invalid path".to_string(),
 +            locale: "C".to_string(),
 +        });
 +        assert!(result.is_err());
 +    }
++
 +    #[test]
 +    fn subject_uses_unix_process_kind() {
 +        let subject = build_subject();
 +        assert_eq!(subject.0, "unix-process");
 +        assert!(subject.1.contains_key("pid"));
 +        assert!(subject.1.contains_key("uid"));
 +    }
++
 +    #[test]
 +    fn invalid_object_path_error_message_mentions_path() {
 +        let err = match PolkitAgent::new(PolkitBackendConfig {
 +            object_path: "invalid path".to_string(),
 +            locale: "C".to_string(),
 +        }) {
 +            Ok(_) => panic!("invalid object path should fail"),
 +            Err(err) => err,
 +        };
 +        assert!(err.to_string().contains("invalid polkit object path"));
 +    }
 +}

garcard/src/config.rsadded

 +use anyhow::{Context, Result};
 +use garcard_ipc::socket_path;
 +use serde::Deserialize;
 +use std::fmt;
 +use std::path::PathBuf;
++
 +/// Runtime configuration for the garcard daemon.
 +#[derive(Debug, Clone)]
 +pub struct Config {
 +    pub socket_path: PathBuf,
 +    pub socket_mode: u32,
 +    pub agent_backend: AgentBackendMode,
 +    pub polkit_object_path: String,
 +    pub locale: String,
 +}
++
 +impl Default for Config {
 +    fn default() -> Self {
 +        Self {
 +            socket_path: socket_path(),
 +            socket_mode: 0o600,
 +            agent_backend: AgentBackendMode::Auto,
 +            polkit_object_path: "/org/gardesk/Garcard/AuthAgent".to_string(),
 +            locale: std::env::var("LANG").unwrap_or_else(|_| "en_US.UTF-8".to_string()),
 +        }
 +    }
 +}
++
 +impl Config {
 +    pub fn load() -> Result<Self> {
 +        let mut cfg = Self::default();
 +        cfg.apply_file_config()?;
++
 +        if let Some(raw_mode) = std::env::var_os("GARCARD_SOCKET_MODE") {
 +            let parsed = parse_octal_mode(&raw_mode.to_string_lossy())
 +                .with_context(|| "Invalid GARCARD_SOCKET_MODE (expected octal, e.g. 600)")?;
 +            cfg.socket_mode = parsed;
 +        }
++
 +        if let Some(raw_socket) = std::env::var_os("GARCARD_SOCKET") {
 +            cfg.socket_path = PathBuf::from(raw_socket);
 +        }
 +        if let Some(raw_backend) = std::env::var_os("GARCARD_AGENT_BACKEND") {
 +            cfg.agent_backend = AgentBackendMode::from_str(&raw_backend.to_string_lossy())
 +                .with_context(|| "Invalid GARCARD_AGENT_BACKEND (expected auto|polkit|stub)")?;
 +        }
 +        if let Some(raw_object_path) = std::env::var_os("GARCARD_POLKIT_OBJECT_PATH") {
 +            cfg.polkit_object_path = raw_object_path.to_string_lossy().to_string();
 +        }
 +        if let Some(raw_locale) = std::env::var_os("GARCARD_LOCALE") {
 +            cfg.locale = raw_locale.to_string_lossy().to_string();
 +        }
++
 +        Ok(cfg)
 +    }
++
 +    fn apply_file_config(&mut self) -> Result<()> {
 +        let Some(path) = config_path() else {
 +            return Ok(());
 +        };
 +        if !path.exists() {
 +            return Ok(());
 +        }
++
 +        let content = std::fs::read_to_string(&path)
 +            .with_context(|| format!("Failed to read config file {}", path.display()))?;
 +        let file_cfg: FileConfig = toml::from_str(&content)
 +            .with_context(|| format!("Failed to parse config file {}", path.display()))?;
++
 +        if let Some(socket_path) = file_cfg.socket_path {
 +            self.socket_path = PathBuf::from(socket_path);
 +        }
 +        if let Some(socket_mode) = file_cfg.socket_mode {
 +            self.socket_mode = parse_octal_mode(&socket_mode)
 +                .with_context(|| "Invalid socket_mode in config file (expected octal)")?;
 +        }
 +        if let Some(agent_backend) = file_cfg.agent_backend {
 +            self.agent_backend = AgentBackendMode::from_str(&agent_backend)
 +                .with_context(|| "Invalid agent_backend in config file")?;
 +        }
 +        if let Some(polkit_object_path) = file_cfg.polkit_object_path {
 +            self.polkit_object_path = polkit_object_path;
 +        }
 +        if let Some(locale) = file_cfg.locale {
 +            self.locale = locale;
 +        }
++
 +        Ok(())
 +    }
 +}
++
 +#[derive(Debug, Clone, Copy, PartialEq, Eq)]
 +pub enum AgentBackendMode {
 +    Auto,
 +    Polkit,
 +    Stub,
 +}
++
 +impl AgentBackendMode {
 +    fn from_str(raw: &str) -> Result<Self> {
 +        match raw.trim().to_lowercase().as_str() {
 +            "auto" => Ok(Self::Auto),
 +            "polkit" => Ok(Self::Polkit),
 +            "stub" => Ok(Self::Stub),
 +            other => anyhow::bail!("unsupported backend mode: {}", other),
 +        }
 +    }
 +}
++
 +impl fmt::Display for AgentBackendMode {
 +    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 +        let value = match self {
 +            Self::Auto => "auto",
 +            Self::Polkit => "polkit",
 +            Self::Stub => "stub",
 +        };
 +        write!(f, "{}", value)
 +    }
 +}
++
 +#[derive(Debug, Clone, Deserialize, Default)]
 +#[serde(default)]
 +struct FileConfig {
 +    socket_path: Option<String>,
 +    socket_mode: Option<String>,
 +    agent_backend: Option<String>,
 +    polkit_object_path: Option<String>,
 +    locale: Option<String>,
 +}
++
 +fn config_path() -> Option<PathBuf> {
 +    if let Some(explicit) = std::env::var_os("GARCARD_CONFIG") {
 +        return Some(PathBuf::from(explicit));
 +    }
++
 +    dirs::config_dir().map(|base| base.join("garcard/config.toml"))
 +}
++
 +fn parse_octal_mode(raw: &str) -> Result<u32> {
 +    let trimmed = raw.trim();
 +    let mode = u32::from_str_radix(trimmed, 8)
 +        .with_context(|| format!("failed to parse mode value: {trimmed}"))?;
 +    Ok(mode)
 +}
++
 +#[cfg(test)]
 +mod tests {
 +    use super::*;
++
 +    #[test]
 +    fn parse_mode_octal() {
 +        let mode = parse_octal_mode("640").expect("valid mode");
 +        assert_eq!(mode, 0o640);
 +    }
++
 +    #[test]
 +    fn parse_mode_rejects_invalid() {
 +        let err = parse_octal_mode("x00").expect_err("should fail");
 +        assert!(err.to_string().contains("failed to parse mode value"));
 +    }
++
 +    #[test]
 +    fn parse_file_config_values() {
 +        let parsed: FileConfig = toml::from_str(
 +            r#"
 +socket_path = "/tmp/custom-garcard.sock"
 +socket_mode = "640"
 +agent_backend = "stub"
 +polkit_object_path = "/org/gardesk/Garcard/TestAgent"
 +locale = "C"
 +"#,
 +        )
 +        .expect("parse file config");
++
 +        assert_eq!(
 +            parsed.socket_path.as_deref(),
 +            Some("/tmp/custom-garcard.sock")
 +        );
 +        assert_eq!(parsed.socket_mode.as_deref(), Some("640"));
 +        assert_eq!(parsed.agent_backend.as_deref(), Some("stub"));
 +        assert_eq!(
 +            parsed.polkit_object_path.as_deref(),
 +            Some("/org/gardesk/Garcard/TestAgent")
 +        );
 +        assert_eq!(parsed.locale.as_deref(), Some("C"));
 +    }
++
 +    #[test]
 +    fn backend_mode_parsing() {
 +        assert_eq!(
 +            AgentBackendMode::from_str("auto").expect("auto"),
 +            AgentBackendMode::Auto
 +        );
 +        assert_eq!(
 +            AgentBackendMode::from_str("polkit").expect("polkit"),
 +            AgentBackendMode::Polkit
 +        );
 +        assert_eq!(
 +            AgentBackendMode::from_str("stub").expect("stub"),
 +            AgentBackendMode::Stub
 +        );
 +    }
++
 +    #[test]
 +    fn backend_mode_rejects_unknown() {
 +        let err = AgentBackendMode::from_str("bad").expect_err("should fail");
 +        assert!(err.to_string().contains("unsupported backend mode"));
 +    }
 +}

garcard/src/daemon.rsadded

 +use crate::agent::{AuthAgentBackend, PolkitAgent, PolkitBackendConfig, StubPolkitAgent};
 +use crate::config::{AgentBackendMode, Config};
 +use crate::state::RuntimeState;
 +use anyhow::{Context, Result};
 +use garcard_ipc::{Command, Response};
 +use serde_json::json;
 +use std::os::unix::fs::PermissionsExt;
 +use std::path::{Path, PathBuf};
 +use std::sync::Arc;
 +use tokio::io::{AsyncBufReadExt, AsyncWriteExt, BufReader};
 +use tokio::net::{UnixListener, UnixStream};
 +use tokio::sync::mpsc;
++
 +/// Removes daemon socket on process exit.
 +struct SocketGuard {
 +    path: PathBuf,
 +}
++
 +impl SocketGuard {
 +    fn new(path: PathBuf) -> Self {
 +        Self { path }
 +    }
 +}
++
 +impl Drop for SocketGuard {
 +    fn drop(&mut self) {
 +        let _ = std::fs::remove_file(&self.path);
 +    }
 +}
++
 +pub async fn run(config: Config) -> Result<()> {
 +    let mut backend = init_backend(&config)?;
++
 +    prepare_socket(&config.socket_path).await?;
 +    if let Some(parent) = config.socket_path.parent() {
 +        tokio::fs::create_dir_all(parent)
 +            .await
 +            .with_context(|| format!("Failed to create socket directory {}", parent.display()))?;
 +    }
++
 +    let listener = UnixListener::bind(&config.socket_path)
 +        .with_context(|| format!("Failed to bind socket {}", config.socket_path.display()))?;
 +    std::fs::set_permissions(
 +        &config.socket_path,
 +        std::fs::Permissions::from_mode(config.socket_mode),
 +    )
 +    .with_context(|| {
 +        format!(
 +            "Failed to set socket permissions for {}",
 +            config.socket_path.display()
 +        )
 +    })?;
++
 +    let _socket_guard = SocketGuard::new(config.socket_path.clone());
 +    let state = Arc::new(RuntimeState::new(
 +        config.socket_path.display().to_string(),
 +        backend.name(),
 +    ));
 +    let (shutdown_tx, mut shutdown_rx) = mpsc::unbounded_channel::<()>();
++
 +    let mut sigterm = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::terminate())
 +        .context("Failed to register SIGTERM handler")?;
 +    let mut sigint = tokio::signal::unix::signal(tokio::signal::unix::SignalKind::interrupt())
 +        .context("Failed to register SIGINT handler")?;
++
 +    tracing::info!(
 +        socket = %config.socket_path.display(),
 +        pid = state.status().pid,
 +        backend = backend.name(),
 +        "garcard daemon started"
 +    );
++
 +    loop {
 +        tokio::select! {
 +            _ = sigterm.recv() => {
 +                tracing::info!("Received SIGTERM");
 +                break;
 +            }
 +            _ = sigint.recv() => {
 +                tracing::info!("Received SIGINT");
 +                break;
 +            }
 +            maybe_shutdown = shutdown_rx.recv() => {
 +                if maybe_shutdown.is_some() {
 +                    tracing::info!("Shutdown requested via IPC");
 +                } else {
 +                    tracing::info!("Shutdown channel closed");
 +                }
 +                break;
 +            }
 +            accept = listener.accept() => {
 +                match accept {
 +                    Ok((stream, _)) => {
 +                        let runtime = Arc::clone(&state);
 +                        let shutdown = shutdown_tx.clone();
 +                        tokio::spawn(async move {
 +                            if let Err(err) = handle_client(stream, runtime, shutdown).await {
 +                                tracing::warn!(error = %err, "Client request failed");
 +                            }
 +                        });
 +                    }
 +                    Err(err) => {
 +                        tracing::error!(error = %err, "Failed to accept IPC client");
 +                    }
 +                }
 +            }
 +        }
 +    }
++
 +    backend.unregister()?;
 +    tracing::info!("garcard daemon stopped");
 +    Ok(())
 +}
++
 +fn init_backend(config: &Config) -> Result<Box<dyn AuthAgentBackend>> {
 +    match config.agent_backend {
 +        AgentBackendMode::Stub => {
 +            let mut backend: Box<dyn AuthAgentBackend> = Box::new(StubPolkitAgent);
 +            backend.register()?;
 +            Ok(backend)
 +        }
 +        AgentBackendMode::Polkit => {
 +            let mut backend: Box<dyn AuthAgentBackend> =
 +                Box::new(PolkitAgent::new(PolkitBackendConfig {
 +                    object_path: config.polkit_object_path.clone(),
 +                    locale: config.locale.clone(),
 +                })?);
 +            backend.register()?;
 +            Ok(backend)
 +        }
 +        AgentBackendMode::Auto => {
 +            let attempt = (|| -> Result<Box<dyn AuthAgentBackend>> {
 +                let mut backend: Box<dyn AuthAgentBackend> =
 +                    Box::new(PolkitAgent::new(PolkitBackendConfig {
 +                        object_path: config.polkit_object_path.clone(),
 +                        locale: config.locale.clone(),
 +                    })?);
 +                backend.register()?;
 +                Ok(backend)
 +            })();
++
 +            match attempt {
 +                Ok(backend) => Ok(backend),
 +                Err(err) => {
 +                    tracing::warn!(
 +                        error = %err,
 +                        "Failed to initialize polkit backend, falling back to stub"
 +                    );
 +                    let mut fallback: Box<dyn AuthAgentBackend> = Box::new(StubPolkitAgent);
 +                    fallback.register()?;
 +                    Ok(fallback)
 +                }
 +            }
 +        }
 +    }
 +}
++
 +async fn prepare_socket(path: &Path) -> Result<()> {
 +    if !path.exists() {
 +        return Ok(());
 +    }
++
 +    match UnixStream::connect(path).await {
 +        Ok(_) => {
 +            anyhow::bail!(
 +                "garcard daemon is already running (socket: {})",
 +                path.display()
 +            );
 +        }
 +        Err(_) => {
 +            tokio::fs::remove_file(path)
 +                .await
 +                .with_context(|| format!("Failed to remove stale socket {}", path.display()))?;
 +            tracing::warn!(socket = %path.display(), "Removed stale socket");
 +        }
 +    }
++
 +    Ok(())
 +}
++
 +async fn handle_client(
 +    stream: UnixStream,
 +    state: Arc<RuntimeState>,
 +    shutdown_tx: mpsc::UnboundedSender<()>,
 +) -> Result<()> {
 +    let (reader, mut writer) = stream.into_split();
 +    let mut reader = BufReader::new(reader);
 +    let mut line = String::new();
++
 +    let bytes = reader
 +        .read_line(&mut line)
 +        .await
 +        .context("Failed to read command")?;
 +    if bytes == 0 {
 +        return Ok(());
 +    }
++
 +    let command: Command = serde_json::from_str(line.trim()).context("Invalid command payload")?;
 +    let response = dispatch(command, &state, &shutdown_tx);
 +    let payload = serde_json::to_string(&response).context("Failed to encode response")?;
++
 +    writer
 +        .write_all(payload.as_bytes())
 +        .await
 +        .context("Failed to write response")?;
 +    writer
 +        .write_all(b"\n")
 +        .await
 +        .context("Failed to terminate response line")?;
 +    writer.flush().await.context("Failed to flush response")?;
++
 +    Ok(())
 +}
++
 +fn dispatch(
 +    command: Command,
 +    state: &RuntimeState,
 +    shutdown_tx: &mpsc::UnboundedSender<()>,
 +) -> Response {
 +    match command {
 +        Command::Ping => Response::ok_with_data(json!({ "pong": true })),
 +        Command::Status => Response::ok_with_data(state.status()),
 +        Command::Version => Response::ok_with_data(state.version()),
 +        Command::AuthSummary => Response::ok_with_data(state.auth_summary()),
 +        Command::Quit => {
 +            if shutdown_tx.send(()).is_err() {
 +                Response::err("daemon shutdown channel unavailable")
 +            } else {
 +                Response::ok_with_data(json!({ "message": "shutdown_requested" }))
 +            }
 +        }
 +    }
 +}
++
 +#[cfg(test)]
 +mod tests {
 +    use super::*;
++
 +    fn fake_state() -> RuntimeState {
 +        RuntimeState::new("/tmp/garcard-test.sock".to_string(), "test-backend")
 +    }
++
 +    #[test]
 +    fn dispatch_ping_returns_pong() {
 +        let state = fake_state();
 +        let (shutdown_tx, _shutdown_rx) = mpsc::unbounded_channel();
++
 +        let response = dispatch(Command::Ping, &state, &shutdown_tx);
 +        assert!(response.success);
++
 +        let data = response.data.expect("data");
 +        assert_eq!(data.get("pong").and_then(|v| v.as_bool()), Some(true));
 +    }
++
 +    #[test]
 +    fn dispatch_quit_signals_shutdown() {
 +        let state = fake_state();
 +        let (shutdown_tx, mut shutdown_rx) = mpsc::unbounded_channel();
++
 +        let response = dispatch(Command::Quit, &state, &shutdown_tx);
 +        assert!(response.success);
 +        assert!(shutdown_rx.try_recv().is_ok());
 +    }
++
 +    #[test]
 +    fn auto_backend_falls_back_to_stub_for_bad_object_path() {
 +        let config = Config {
 +            socket_path: PathBuf::from("/tmp/garcard-test.sock"),
 +            socket_mode: 0o600,
 +            agent_backend: AgentBackendMode::Auto,
 +            polkit_object_path: "invalid path".to_string(),
 +            locale: "C".to_string(),
 +        };
++
 +        let backend = init_backend(&config).expect("auto mode should fall back");
 +        assert_eq!(backend.name(), "stub-polkit-agent");
 +    }
 +}

garcard/src/main.rsadded

 +mod agent;
 +mod config;
 +mod daemon;
 +mod state;
++
 +use anyhow::Result;
 +use clap::{Parser, Subcommand};
 +use tracing_subscriber::EnvFilter;
++
 +#[derive(Parser, Debug)]
 +#[command(
 +    name = "garcard",
 +    about = "Polkit auth agent daemon for the gar desktop suite"
 +)]
 +struct Cli {
 +    #[command(subcommand)]
 +    command: Option<Commands>,
++
 +    /// Increase logging verbosity
 +    #[arg(short, long, action = clap::ArgAction::Count)]
 +    verbose: u8,
 +}
++
 +#[derive(Subcommand, Debug)]
 +enum Commands {
 +    /// Start daemon mode
 +    Daemon,
 +}
++
 +#[tokio::main]
 +async fn main() -> Result<()> {
 +    let cli = Cli::parse();
 +    init_logging(cli.verbose);
++
 +    let command = cli.command.unwrap_or(Commands::Daemon);
 +    match command {
 +        Commands::Daemon => {
 +            let config = config::Config::load()?;
 +            daemon::run(config).await
 +        }
 +    }
 +}
++
 +fn init_logging(verbosity: u8) {
 +    let filter = match verbosity {
 +        0 => "garcard=info",
 +        1 => "garcard=debug",
 +        _ => "garcard=trace",
 +    };
++
 +    let env_filter = EnvFilter::try_from_default_env().unwrap_or_else(|_| EnvFilter::new(filter));
 +    tracing_subscriber::fmt()
 +        .with_env_filter(env_filter)
 +        .with_target(false)
 +        .init();
 +}

garcard/src/state.rsadded

 +use garcard_ipc::{AuthSummary, PROTOCOL_VERSION, StatusData, VersionData};
 +use std::sync::RwLock;
 +use std::sync::atomic::{AtomicUsize, Ordering};
 +use std::time::Instant;
++
 +/// Tracks auth workflow state with no sensitive data.
 +#[derive(Debug)]
 +pub struct AuthState {
 +    current_state: RwLock<String>,
 +    active_requests: AtomicUsize,
 +    queued_requests: AtomicUsize,
 +}
++
 +impl Default for AuthState {
 +    fn default() -> Self {
 +        Self {
 +            current_state: RwLock::new("idle".to_string()),
 +            active_requests: AtomicUsize::new(0),
 +            queued_requests: AtomicUsize::new(0),
 +        }
 +    }
 +}
++
 +impl AuthState {
 +    pub fn set_state(&self, next: impl Into<String>) {
 +        if let Ok(mut state) = self.current_state.write() {
 +            *state = next.into();
 +        }
 +    }
++
 +    pub fn set_active_requests(&self, count: usize) {
 +        self.active_requests.store(count, Ordering::Relaxed);
 +    }
++
 +    pub fn set_queued_requests(&self, count: usize) {
 +        self.queued_requests.store(count, Ordering::Relaxed);
 +    }
++
 +    pub fn summary(&self) -> AuthSummary {
 +        let state = self
 +            .current_state
 +            .read()
 +            .map(|value| value.clone())
 +            .unwrap_or_else(|_| "unknown".to_string());
++
 +        AuthSummary {
 +            state,
 +            active_requests: self.active_requests.load(Ordering::Relaxed),
 +            queued_requests: self.queued_requests.load(Ordering::Relaxed),
 +        }
 +    }
 +}
++
 +/// Immutable process/runtime metadata for IPC status.
 +#[derive(Debug)]
 +pub struct RuntimeState {
 +    started_at: Instant,
 +    pid: u32,
 +    socket_path: String,
 +    backend_name: &'static str,
 +    auth: AuthState,
 +}
++
 +impl RuntimeState {
 +    pub fn new(socket_path: String, backend_name: &'static str) -> Self {
 +        let auth = AuthState::default();
 +        auth.set_state("idle");
 +        auth.set_active_requests(0);
 +        auth.set_queued_requests(0);
++
 +        Self {
 +            started_at: Instant::now(),
 +            pid: std::process::id(),
 +            socket_path,
 +            backend_name,
 +            auth,
 +        }
 +    }
++
 +    pub fn status(&self) -> StatusData {
 +        StatusData {
 +            running: true,
 +            pid: self.pid,
 +            uptime_secs: self.started_at.elapsed().as_secs(),
 +            version: env!("CARGO_PKG_VERSION").to_string(),
 +            protocol_version: PROTOCOL_VERSION,
 +            socket_path: self.socket_path.clone(),
 +            agent_backend: self.backend_name.to_string(),
 +        }
 +    }
++
 +    pub fn version(&self) -> VersionData {
 +        VersionData {
 +            component: "garcard".to_string(),
 +            version: env!("CARGO_PKG_VERSION").to_string(),
 +            protocol_version: PROTOCOL_VERSION,
 +        }
 +    }
++
 +    pub fn auth_summary(&self) -> AuthSummary {
 +        self.auth.summary()
 +    }
++
 +    #[allow(dead_code)]
 +    pub fn auth_mutation(&self) -> &AuthState {
 +        &self.auth
 +    }
 +}
++
 +#[cfg(test)]
 +mod tests {
 +    use super::*;
++
 +    #[test]
 +    fn auth_state_defaults_to_idle() {
 +        let state = AuthState::default();
 +        let summary = state.summary();
 +        assert_eq!(summary.state, "idle");
 +        assert_eq!(summary.active_requests, 0);
 +        assert_eq!(summary.queued_requests, 0);
 +    }
++
 +    #[test]
 +    fn auth_state_updates_summary() {
 +        let state = AuthState::default();
 +        state.set_state("verifying");
 +        state.set_active_requests(2);
 +        state.set_queued_requests(3);
++
 +        let summary = state.summary();
 +        assert_eq!(summary.state, "verifying");
 +        assert_eq!(summary.active_requests, 2);
 +        assert_eq!(summary.queued_requests, 3);
 +    }
 +}

garcardctl/Cargo.tomladded

 +[package]
 +name = "garcardctl"
 +version.workspace = true
 +edition.workspace = true
 +license.workspace = true
 +authors.workspace = true
++
 +[dependencies]
 +garcard-ipc.workspace = true
++
 +anyhow.workspace = true
 +clap.workspace = true
 +serde_json.workspace = true

garcardctl/src/main.rsadded

 +use anyhow::{Context, Result};
 +use clap::{Parser, Subcommand};
 +use garcard_ipc::{Command, Response, socket_path};
 +use std::io::{BufRead, BufReader, Write};
 +use std::os::unix::net::UnixStream;
++
 +#[derive(Parser, Debug)]
 +#[command(name = "garcardctl", about = "Control and inspect garcard daemon")]
 +struct Cli {
 +    #[command(subcommand)]
 +    command: Commands,
 +}
++
 +#[derive(Subcommand, Debug)]
 +enum Commands {
 +    Ping,
 +    Status,
 +    Version,
 +    AuthSummary,
 +    Quit,
 +}
++
 +fn main() -> Result<()> {
 +    let cli = Cli::parse();
 +    let command = to_protocol_command(cli.command);
 +    let response = send_command(&command)?;
++
 +    if response.success {
 +        if let Some(data) = response.data {
 +            println!("{}", serde_json::to_string_pretty(&data)?);
 +        } else {
 +            println!("OK");
 +        }
 +        return Ok(());
 +    }
++
 +    let message = response
 +        .error
 +        .unwrap_or_else(|| "unknown daemon error".to_string());
 +    eprintln!("Error: {}", message);
 +    std::process::exit(1);
 +}
++
 +fn to_protocol_command(command: Commands) -> Command {
 +    match command {
 +        Commands::Ping => Command::Ping,
 +        Commands::Status => Command::Status,
 +        Commands::Version => Command::Version,
 +        Commands::AuthSummary => Command::AuthSummary,
 +        Commands::Quit => Command::Quit,
 +    }
 +}
++
 +fn send_command(command: &Command) -> Result<Response> {
 +    let socket = socket_path();
 +    let mut stream = UnixStream::connect(&socket).with_context(|| {
 +        format!(
 +            "failed to connect to garcard daemon at {} (is it running?)",
 +            socket.display()
 +        )
 +    })?;
++
 +    let request = serde_json::to_string(command).context("failed to serialize command")?;
 +    writeln!(stream, "{}", request).context("failed to send command")?;
 +    stream.flush().context("failed to flush command")?;
++
 +    let mut reader = BufReader::new(stream);
 +    let mut line = String::new();
 +    let bytes = reader
 +        .read_line(&mut line)
 +        .context("failed to read daemon response")?;
 +    if bytes == 0 {
 +        anyhow::bail!("daemon closed socket before responding");
 +    }
++
 +    let response: Response =
 +        serde_json::from_str(line.trim()).context("failed to decode daemon response")?;
 +    Ok(response)
 +}