Add Linux keyring storage boundary

.gitea/workflows/ci.yaml

@@ -18,3 +18,8 @@ jobs:
       - run: npm run format:check
       - run: npm run check
       - run: npm run build
+      - uses: actions-rust-lang/setup-rust-toolchain@v1
+      - working-directory: native
+        run: cargo fmt -- --check
+      - working-directory: native
+        run: cargo test

README.md

@@ -4,9 +4,10 @@ This directory is the home of the standalone Linux client repository.
 
 The current development shell connects to the server readiness endpoint and
 provides an administrator login gate. The browser/dev client keeps its bearer
-session in memory only; the native AppImage integration must replace that
+session in memory only. The `native/` crate defines the AppImage storage
-temporary behavior with the Linux kernel keyring before persistent client
+boundary: `settings.json` contains only the server address and username, while
-authentication is considered complete.
+the session credential is stored in the Linux kernel keyring with no plaintext
+fallback.
 
 The client is a Svelte-based control surface distributed as an x86-64 AppImage. It communicates with `trixie-server` through the documented versioned HTTP and authenticated WebSocket interfaces.
 

native/Cargo.lock

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native/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "trixy-native"
+version = "0.1.0"
+edition = "2021"
+license = "MIT"
+description = "Native Linux storage boundary for the Trixie client"
+
+[dependencies]
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+sha2 = "0.10"
+
+[dev-dependencies]
+tempfile = "3"

native/README.md

@@ -0,0 +1,12 @@
+# Native credential boundary
+
+This crate is the storage boundary used by the future Linux AppImage shell.
+`Settings` writes only `server_address` and `username` to the client
+`settings.json`. Session credentials are stored under the Linux kernel
+keyring service `trixie.server.session`, scoped by server address and
+username. `load_session` returns `None` when the keyring is unavailable;
+callers must return to credential entry and must not create a plaintext
+fallback.
+
+The crate uses `keyctl` with argument arrays, never a shell command. It does
+not log or serialize session values.

native/src/lib.rs

@@ -0,0 +1,146 @@
+//! Native persistence boundary for the Linux client.
+//!
+//! Settings are deliberately limited to non-secret connection metadata. The
+//! session credential is stored as a `user` key in the Linux kernel keyring
+//! through the `keyctl` utility. If keyring access fails, callers receive an
+//! error and must ask for credentials again; no plaintext fallback is allowed.
+
+use serde::{Deserialize, Serialize};
+use sha2::{Digest, Sha256};
+use std::{
+    fs, io,
+    path::{Path, PathBuf},
+    process::Command,
+};
+
+pub const KEYRING_SERVICE: &str = "trixie.server.session";
+
+#[derive(Debug, Clone, Serialize, Deserialize, PartialEq, Eq)]
+pub struct Settings {
+    pub server_address: String,
+    pub username: String,
+}
+
+impl Settings {
+    pub fn load(path: impl AsRef<Path>) -> io::Result<Self> {
+        let bytes = fs::read(path)?;
+        serde_json::from_slice(&bytes)
+            .map_err(|error| io::Error::new(io::ErrorKind::InvalidData, error))
+    }
+
+    pub fn save(&self, path: impl AsRef<Path>) -> io::Result<()> {
+        let path = path.as_ref();
+        if let Some(parent) = path.parent() {
+            fs::create_dir_all(parent)?;
+        }
+        let bytes = serde_json::to_vec_pretty(self)
+            .map_err(|error| io::Error::new(io::ErrorKind::InvalidData, error))?;
+        let temporary = path.with_extension("json.tmp");
+        fs::write(&temporary, bytes)?;
+        fs::rename(temporary, path)
+    }
+}
+
+pub fn default_settings_path() -> PathBuf {
+    let base = std::env::var_os("XDG_CONFIG_HOME")
+        .map(PathBuf::from)
+        .or_else(|| std::env::var_os("HOME").map(|home| PathBuf::from(home).join(".config")))
+        .unwrap_or_else(|| PathBuf::from("."));
+    base.join("trixie").join("settings.json")
+}
+
+fn key_description(settings: &Settings) -> String {
+    let mut digest = Sha256::new();
+    digest.update(settings.server_address.as_bytes());
+    digest.update([0]);
+    digest.update(settings.username.as_bytes());
+    let digest = digest.finalize();
+    format!("{KEYRING_SERVICE}:{}", hex_encode(&digest))
+}
+
+fn hex_encode(bytes: &[u8]) -> String {
+    const HEX: &[u8; 16] = b"0123456789abcdef";
+    let mut result = String::with_capacity(bytes.len() * 2);
+    for byte in bytes {
+        result.push(HEX[(byte >> 4) as usize] as char);
+        result.push(HEX[(byte & 0x0f) as usize] as char);
+    }
+    result
+}
+
+fn keyctl(args: &[&str]) -> io::Result<Vec<u8>> {
+    let output = Command::new("keyctl").args(args).output()?;
+    if !output.status.success() {
+        return Err(io::Error::new(
+            io::ErrorKind::PermissionDenied,
+            "Linux kernel keyring access failed",
+        ));
+    }
+    Ok(output.stdout)
+}
+
+pub fn store_session(settings: &Settings, session: &str) -> io::Result<()> {
+    if session.is_empty() {
+        return Err(io::Error::new(io::ErrorKind::InvalidInput, "empty session"));
+    }
+    let description = key_description(settings);
+    keyctl(&["add", "user", &description, session, "@s"]).map(|_| ())
+}
+
+pub fn load_session(settings: &Settings) -> io::Result<Option<String>> {
+    let description = key_description(settings);
+    let id = match keyctl(&["search", "@s", "user", &description]) {
+        Ok(value) => String::from_utf8_lossy(&value).trim().to_string(),
+        Err(_) => return Ok(None),
+    };
+    if id.is_empty() {
+        return Ok(None);
+    }
+    let value = keyctl(&["pipe", &id])?;
+    String::from_utf8(value)
+        .map(Some)
+        .map_err(|error| io::Error::new(io::ErrorKind::InvalidData, error))
+}
+
+pub fn clear_session(settings: &Settings) -> io::Result<()> {
+    let description = key_description(settings);
+    let id = String::from_utf8_lossy(&keyctl(&["search", "@s", "user", &description])?)
+        .trim()
+        .to_string();
+    if id.is_empty() {
+        return Ok(());
+    }
+    keyctl(&["unlink", &id, "@s"]).map(|_| ())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    fn settings() -> Settings {
+        Settings {
+            server_address: "https://trixie.example".into(),
+            username: "admin".into(),
+        }
+    }
+
+    #[test]
+    fn settings_round_trip_contains_no_password_field() {
+        let directory = tempfile::tempdir().expect("temporary directory");
+        let path = directory.path().join("settings.json");
+        settings().save(&path).expect("save settings");
+        let text = fs::read_to_string(&path).expect("read settings");
+        assert!(!text.contains("password"));
+        assert_eq!(Settings::load(path).expect("load settings"), settings());
+    }
+
+    #[test]
+    fn key_description_is_stable_but_scoped_to_connection_and_user() {
+        let first = key_description(&settings());
+        assert_eq!(first, key_description(&settings()));
+        let mut different = settings();
+        different.username = "moderator".into();
+        assert_ne!(first, key_description(&different));
+        assert!(first.starts_with(KEYRING_SERVICE));
+    }
+}

native/target/.rustc_info.json

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