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Ian 0ca30e444e Report installs to Strix when the config names an API key 2026-10-22 10:31:05 -04:00
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version = "0.14.7+wasi-0.2.4"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "883478de20367e224c0090af9cf5f9fa85bed63a95c1abf3afc5c083ebc06e8c"
dependencies = [
"wasip2",
]
[[package]]
name = "wasip2"
version = "1.0.4+wasi-0.2.12"
@@ -4009,10 +3626,19 @@ dependencies = [
]
[[package]]
name = "wasm-bindgen"
version = "0.2.128"
name = "wasite"
version = "1.0.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "aecb87a33d3b0c5e3b7aa46336eaf486cffafbd281b195e4c8b80d50df2351bf"
checksum = "66fe902b4a6b8028a753d5424909b764ccf79b7a209eac9bf97e59cda9f71a42"
dependencies = [
"wasi 0.14.7+wasi-0.2.4",
]
[[package]]
name = "wasm-bindgen"
version = "0.2.129"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "9bb54f33acc68fd454578d9820b0bde1a1a3d17aa17bb7b6595806d02886d409"
dependencies = [
"cfg-if",
"once_cell",
@@ -4023,9 +3649,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-macro"
version = "0.2.128"
version = "0.2.129"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a690d511e3c1a8b3a55e33511e3c2c00c78415cd23650f32b808627f5696b9ed"
checksum = "2e29d0c35b16e224a7eeb5cd2d25e3e1968fbd65604117b44d3b789d00ee8535"
dependencies = [
"quote",
"wasm-bindgen-macro-support",
@@ -4033,9 +3659,9 @@ dependencies = [
[[package]]
name = "wasm-bindgen-macro-support"
version = "0.2.128"
version = "0.2.129"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "411e4887f0071ef2d2164a9d5fdf2d20efbef78fccd3a78b0c10a1dc5295e48a"
checksum = "6f501a8bc3719dba86ef8ae4728879c08001bea749eb1333ac5b91e040e2a6b7"
dependencies = [
"bumpalo",
"proc-macro2",
@@ -4046,13 +3672,23 @@ dependencies = [
[[package]]
name = "wasm-bindgen-shared"
version = "0.2.128"
version = "0.2.129"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "81941cd78d0c92026c33e5e01312845a4cb1e9af3407f9134b100dd03144103e"
checksum = "23f0c9c52aa7cd7d77769a4cfe2a9adb1b331f489a41d912ce14513d5ab995c6"
dependencies = [
"unicode-ident",
]
[[package]]
name = "web-sys"
version = "0.3.106"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "88261b9deccee56594c11a3460c462c41f58d148598fe70ad77070126a68aba4"
dependencies = [
"js-sys",
"wasm-bindgen",
]
[[package]]
name = "webpki-root-certs"
version = "1.0.9"
@@ -4081,10 +3717,17 @@ dependencies = [
]
[[package]]
name = "widestring"
version = "1.2.1"
name = "whoami"
version = "2.1.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "72069c3113ab32ab29e5584db3c6ec55d416895e60715417b5b883a357c3e471"
checksum = "626c4bac6755d76ffc12cb01b2eac751db1996b9e0041de9aa02c8c211ddc82c"
dependencies = [
"libc",
"libredox",
"objc2-system-configuration",
"wasite",
"web-sys",
]
[[package]]
name = "wildcard"
@@ -4126,100 +3769,12 @@ version = "0.4.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "712e227841d057c1ee1cd2fb22fa7e5a5461ae8e48fa2ca79ec42cfc1931183f"
[[package]]
name = "windows"
version = "0.62.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "527fadee13e0c05939a6a05d5bd6eec6cd2e3dbd648b9f8e447c6518133d8580"
dependencies = [
"windows-collections",
"windows-core",
"windows-future",
"windows-numerics",
]
[[package]]
name = "windows-collections"
version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "23b2d95af1a8a14a3c7367e1ed4fc9c20e0a26e79551b1454d72583c97cc6610"
dependencies = [
"windows-core",
]
[[package]]
name = "windows-core"
version = "0.62.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "b8e83a14d34d0623b51dce9581199302a221863196a1dde71a7663a4c2be9deb"
dependencies = [
"windows-implement",
"windows-interface",
"windows-link",
"windows-result",
"windows-strings",
]
[[package]]
name = "windows-future"
version = "0.3.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "e1d6f90251fe18a279739e78025bd6ddc52a7e22f921070ccdc67dde84c605cb"
dependencies = [
"windows-core",
"windows-link",
"windows-threading",
]
[[package]]
name = "windows-implement"
version = "0.60.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "053e2e040ab57b9dc951b72c264860db7eb3b0200ba345b4e4c3b14f67855ddf"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.119",
]
[[package]]
name = "windows-interface"
version = "0.59.3"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3f316c4a2570ba26bbec722032c4099d8c8bc095efccdc15688708623367e358"
dependencies = [
"proc-macro2",
"quote",
"syn 2.0.119",
]
[[package]]
name = "windows-link"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"
[[package]]
name = "windows-numerics"
version = "0.3.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "6e2e40844ac143cdb44aead537bbf727de9b044e107a0f1220392177d15b0f26"
dependencies = [
"windows-core",
"windows-link",
]
[[package]]
name = "windows-registry"
version = "0.6.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "02752bf7fbdcce7f2a27a742f798510f3e5ad88dbe84871e5168e2120c3d5720"
dependencies = [
"windows-link",
"windows-result",
"windows-strings",
]
[[package]]
name = "windows-result"
version = "0.4.1"
@@ -4229,26 +3784,6 @@ dependencies = [
"windows-link",
]
[[package]]
name = "windows-service"
version = "0.8.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "857224b3b211c6f3616921f081ee54721ee3ad2ace2fac6a6337e032f7b4dcf2"
dependencies = [
"bitflags 2.13.2",
"widestring",
"windows-sys 0.61.2",
]
[[package]]
name = "windows-strings"
version = "0.5.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7837d08f69c77cf6b07689544538e017c1bfcf57e34b4c0ff58e6c2cd3b37091"
dependencies = [
"windows-link",
]
[[package]]
name = "windows-sys"
version = "0.52.0"
@@ -4283,15 +3818,6 @@ dependencies = [
"windows_x86_64_msvc",
]
[[package]]
name = "windows-threading"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "3949bd5b99cafdf1c7ca86b43ca564028dfe27d66958f2470940f73d86d75b37"
dependencies = [
"windows-link",
]
[[package]]
name = "windows_aarch64_gnullvm"
version = "0.52.6"
@@ -4349,16 +3875,6 @@ dependencies = [
"memchr",
]
[[package]]
name = "winreg"
version = "0.56.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "7d6f32a0ff4a9f6f01231eb2059cc85479330739333e0e58cadf03b6af2cca10"
dependencies = [
"cfg-if",
"windows-sys 0.61.2",
]
[[package]]
name = "wit-bindgen"
version = "0.57.1"
+1 -58
View File
@@ -3,7 +3,6 @@ name = "strix-firewall"
version = "0.1.0"
edition = "2021"
license = "Apache-2.0"
authors = ["Strix"]
description = "Screens package downloads for known malware before they reach your machine"
repository = "https://github.com/usestrix/firewall"
homepage = "https://github.com/usestrix/firewall"
@@ -11,20 +10,6 @@ homepage = "https://github.com/usestrix/firewall"
# as an integration test; new tests/*.rs need an explicit [[test]] entry.
autotests = false
# Only Windows ships the service and tray.
[package.metadata.dist.binaries]
x86_64-pc-windows-msvc = ["firewall", "firewall-service", "firewall-tray"]
aarch64-apple-darwin = ["firewall"]
x86_64-apple-darwin = ["firewall"]
aarch64-unknown-linux-gnu = ["firewall"]
x86_64-unknown-linux-gnu = ["firewall"]
[package.metadata.wix]
upgrade-guid = "D944C2F6-BF55-4B21-A60E-1BBDB1A66293"
path-guid = "033B1050-23D0-4F5A-A0D3-F4757B4B67E0"
license = false
eula = false
[lib]
name = "firewall"
# The macOS extension links a staticlib, built on demand:
@@ -35,21 +20,6 @@ crate-type = ["lib"]
name = "firewall"
path = "src/main.rs"
[[bin]]
name = "firewall-service"
path = "src/bin/firewall-service.rs"
required-features = ["machine-wide"]
[[bin]]
name = "firewall-tray"
path = "src/bin/firewall-tray.rs"
required-features = ["machine-wide"]
[[bin]]
name = "firewall-uninstall"
path = "src/bin/firewall-uninstall.rs"
required-features = ["machine-wide"]
[[example]]
name = "proxy-test"
path = "tests/proxy-test/main.rs"
@@ -82,22 +52,10 @@ path = "tests/age.rs"
name = "mitm"
path = "tests/mitm.rs"
[[test]]
name = "tpm"
path = "tests/tpm.rs"
[[test]]
name = "managers"
path = "tests/managers.rs"
[[test]]
name = "blocks"
path = "tests/blocks.rs"
[features]
# Builds the machine-wide binaries: the Windows service and tray, and the macOS uninstaller.
machine-wide = []
[dependencies]
clap = "4.6.6"
directories = "6.0.0"
@@ -114,6 +72,7 @@ tokio = { version = "1.53.1", features = ["io-util", "rt", "sync", "time"] }
tracing = "0.1.44"
tracing-subscriber = { version = "0.3.23", features = ["env-filter"] }
which = "8"
whoami = "2.1.3"
[target.'cfg(target_vendor = "apple")'.dependencies]
core-foundation = "0.10.1"
@@ -121,25 +80,9 @@ rama = { version = "0.4.0", features = ["net-apple-networkextension"] }
security-framework = "3.7.0"
security-framework-sys = "2.17.0"
[target.'cfg(windows)'.dependencies]
muda = { version = "0.21.2", default-features = false }
png = "0.18.1"
rama = { version = "0.4.0", features = ["dns-hickory"] }
schannel = "0.1.29"
tokio = { version = "1.53.1", features = ["net"] }
tracing-appender = "0.2.5"
tray-icon = { version = "0.26.1", default-features = false }
windows = { version = "0.62", features = ["Win32_Foundation", "Win32_Security", "Win32_Security_Authorization", "Win32_Security_Cryptography", "Win32_Storage_FileSystem", "Win32_System_Com", "Win32_System_Console", "Win32_System_Environment", "Win32_System_JobObjects", "Win32_System_LibraryLoader", "Win32_System_Pipes", "Win32_System_Registry", "Win32_System_Threading", "Win32_UI_Controls", "Win32_UI_Shell", "Win32_UI_WindowsAndMessaging"] }
windows-registry = "0.6.1"
windows-service = "0.8.0"
[dev-dependencies]
tokio = { version = "1.53.1", features = ["macros", "rt-multi-thread"] }
[profile.dist]
inherits = "release"
lto = "thin"
# Only on Windows hosts, where the tray and service are built.
[target.'cfg(windows)'.build-dependencies]
embed-resource = "3.0.12"
-16
View File
@@ -1,16 +0,0 @@
//! The tray's task dialogs exist only in version 6 of the common controls, which takes a manifest.
//! Both machine-wide binaries also get the Strix icon.
fn main() {
println!("cargo:rerun-if-changed=src/bin/firewall-tray.manifest");
let msvc = std::env::var("CARGO_CFG_TARGET_ENV").as_deref() == Ok("msvc");
if msvc && std::env::var_os("CARGO_FEATURE_MACHINE_WIDE").is_some() {
let manifest = concat!(env!("CARGO_MANIFEST_DIR"), "/src/bin/firewall-tray.manifest");
println!("cargo:rustc-link-arg-bin=firewall-tray=/MANIFEST:EMBED");
println!("cargo:rustc-link-arg-bin=firewall-tray=/MANIFESTINPUT:{manifest}");
#[cfg(windows)]
embed_resource::compile_for("src/bin/firewall.rc", ["firewall-tray", "firewall-service"], embed_resource::NONE)
// Fails the build, rather than ship without the icon.
.manifest_required()
.unwrap();
}
}
+5 -9
View File
@@ -89,16 +89,12 @@ async fn handle(req: Request, firewall: &Firewall) -> Result<Response, Infallibl
}
info!(method = %req.method(), %url, "forwarding");
// Only an HTTPS registry was downgraded to reach us, so only it is upgraded back and rewritten.
let tls = firewall.is_https_url(&url);
let index = tls && firewall.is_index_url(&url);
let index = firewall.is_index_url(&url);
let (mut parts, body) = req.into_parts();
if tls {
let Ok(uri) = url.parse() else {
return Ok(text(400, "firewall: expected an absolute URL\n"));
};
parts.uri = uri;
}
let Ok(uri) = url.parse() else {
return Ok(text(400, "firewall: expected an absolute URL\n"));
};
parts.uri = uri;
let client = DecompressionLayer::new().into_layer(EasyHttpWebClient::default());
let response = match client.serve(Request::from_parts(parts, body)).await {
+2 -10
View File
@@ -1,7 +1,5 @@
pub mod forward;
pub mod managers;
#[cfg(windows)]
mod windows;
pub use forward::spawn;
pub use managers::*;
@@ -36,8 +34,7 @@ impl Invocation {
pub fn run(port: u16, invocation: &Invocation, dir: Option<&Path>) -> std::io::Result<i32> {
let proxy = crate::local_url(port, "");
let program = resolve(&invocation.program)?;
let mut command = Command::new(&program);
let mut command = Command::new(resolve(&invocation.program)?);
command.args(invocation.arguments(&proxy));
if let Some(dir) = dir {
command.current_dir(dir);
@@ -45,12 +42,7 @@ pub fn run(port: u16, invocation: &Invocation, dir: Option<&Path>) -> std::io::R
for (key, value) in managers::variables(&proxy) {
command.env(key, value);
}
#[cfg(windows)]
windows::prepare();
let status = command.status();
#[cfg(windows)]
let status = status.map_err(|error| windows::explain(error, &program));
Ok(status?.code().unwrap_or(1))
Ok(command.status()?.code().unwrap_or(1))
}
// Command::new only finds .exe on Windows; npm, pnpm and gem are .cmd shims found via PATHEXT.
-64
View File
@@ -1,64 +0,0 @@
use std::io::{Error, ErrorKind};
use std::path::Path;
use std::sync::Once;
use tracing::debug;
use windows::core::{BOOL, PCWSTR};
use windows::Win32::System::Console::{SetConsoleCtrlHandler, CTRL_BREAK_EVENT, CTRL_C_EVENT};
use windows::Win32::System::JobObjects::{
AssignProcessToJobObject, CreateJobObjectW, JobObjectExtendedLimitInformation,
SetInformationJobObject, JOBOBJECT_EXTENDED_LIMIT_INFORMATION,
JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE,
};
use windows::Win32::System::Threading::GetCurrentProcess;
/// Called before spawning, so the manager behaves as it would run from the shell directly.
/// Once per process: a caller may run several managers.
pub fn prepare() {
static PREPARED: Once = Once::new();
PREPARED.call_once(|| {
// The console sends Ctrl+C to the manager too. Exiting first would hand the prompt back
// while a .cmd shim still asks "Terminate batch job (Y/N)?", so wait for its exit instead.
// A handler, unlike ignoring the signal outright, is not inherited by the manager.
let _ = unsafe { SetConsoleCtrlHandler(Some(ignore_interrupt), true) };
if let Err(error) = kill_children_on_exit() {
debug!(%error, "the manager may outlive the firewall");
}
});
}
unsafe extern "system" fn ignore_interrupt(event: u32) -> BOOL {
(event == CTRL_C_EVENT || event == CTRL_BREAK_EVENT).into()
}
/// Joins a job that kills what is left in it once the firewall exits, even if killed itself.
/// The manager inherits the job when spawned, as do its own children.
fn kill_children_on_exit() -> windows::core::Result<()> {
let mut limits = JOBOBJECT_EXTENDED_LIMIT_INFORMATION::default();
limits.BasicLimitInformation.LimitFlags = JOB_OBJECT_LIMIT_KILL_ON_JOB_CLOSE;
// Never closed: the handle closing as the firewall exits is what kills the rest.
let job = unsafe { CreateJobObjectW(None, PCWSTR::null())? };
unsafe {
SetInformationJobObject(
job,
JobObjectExtendedLimitInformation,
(&raw const limits).cast(),
size_of_val(&limits) as u32,
)?
};
unsafe { AssignProcessToJobObject(job, GetCurrentProcess()) }
}
/// Rust refuses to pass a line break to a batch file, where it would cut the command short.
pub fn explain(error: Error, program: &Path) -> Error {
let batch = program
.extension()
.is_some_and(|ext| ext.eq_ignore_ascii_case("cmd") || ext.eq_ignore_ascii_case("bat"));
if !batch || error.kind() != ErrorKind::InvalidInput {
return error;
}
let name = program.file_name().unwrap_or(program.as_os_str()).to_string_lossy();
Error::new(
ErrorKind::InvalidInput,
format!("{name} is a batch file, which cannot be passed an argument with a line break"),
)
}
-26
View File
@@ -1,26 +0,0 @@
//! Started by the Windows service manager. It logs to a file, having no console.
#[cfg(windows)]
fn main() {
// Run by the MSI as it removes the firewall.
if std::env::args().nth(1).as_deref() == Some("uninstall") {
firewall::init_logging("info");
if let Err(e) = firewall::os::windows::uninstall() {
fail("uninstall", &format!("could not uninstall: {e}"))
}
} else if let Err(e) = firewall::os::windows::run_service() {
fail("service", &format!("could not run the service: {e}"))
}
}
#[cfg(windows)]
fn fail(kind: &'static str, message: &str) -> ! {
tracing::error!("{message}");
firewall::telemetry::error(kind);
firewall::telemetry::flush();
std::process::exit(1)
}
/// The service is Windows-only.
#[cfg(not(windows))]
fn main() {}
-9
View File
@@ -1,9 +0,0 @@
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
<dependency>
<dependentAssembly>
<assemblyIdentity type="win32" name="Microsoft.Windows.Common-Controls" version="6.0.0.0"
processorArchitecture="*" publicKeyToken="6595b64144ccf1df" language="*"/>
</dependentAssembly>
</dependency>
</assembly>
-11
View File
@@ -1,11 +0,0 @@
//! The notification-area icon, started at sign-in. A GUI app, so no console opens with it.
#![windows_subsystem = "windows"]
#[cfg(windows)]
fn main() -> Result<(), rama::error::BoxError> {
firewall::os::windows::run_tray()
}
/// The tray is Windows-only.
#[cfg(not(windows))]
fn main() {}
-16
View File
@@ -1,16 +0,0 @@
//! Run as root by the macOS app's uninstall.
#[cfg(target_os = "macos")]
fn main() {
firewall::init_logging("info");
if let Err(e) = firewall::os::macos::uninstall() {
tracing::error!("could not uninstall: {e}");
firewall::telemetry::error("uninstall");
firewall::telemetry::flush();
std::process::exit(1)
}
}
/// Only macOS installs anything system-wide.
#[cfg(not(target_os = "macos"))]
fn main() {}
-2
View File
@@ -1,2 +0,0 @@
// The icon Explorer, UAC and the tray's popups show.
1 ICON "strix.ico"
Binary file not shown.

Before

Width:  |  Height:  |  Size: 13 KiB

-151
View File
@@ -1,151 +0,0 @@
use crate::config::{self, AllowedPackage};
use crate::policies::Package;
use crate::Firewall;
use rama::error::BoxError;
use serde::Serialize;
use std::path::Path;
use std::sync::Mutex;
use std::time::{Duration, Instant};
use tokio::sync::watch;
/// So blocks can't pile up while no app collects them.
const KEPT: usize = 50;
/// Under pip's, pipenv's and pdm's 15 s read timeout, the shortest of the supported managers.
const HOLD: Duration = Duration::from_secs(10);
/// Only hold while an app is asking for blocks, so someone can answer.
const WATCHED: Duration = Duration::from_secs(2);
/// For a minute, so the rest of that install can fetch it too.
const ONCE: Duration = Duration::from_secs(60);
#[derive(Clone, Serialize)]
pub struct BlockedPackage {
pub id: u64,
pub eco: &'static str,
pub name: String,
pub version: Option<String>,
pub filter: &'static str,
pub reason: String,
}
struct Blocks {
last_id: u64,
unsent: Vec<BlockedPackage>,
/// Age holds, the only blocks that can be allowed, each with what wakes its waiting downloads.
held: Vec<(BlockedPackage, watch::Sender<bool>)>,
polled: Option<Instant>,
}
static BLOCKS: Mutex<Blocks> =
Mutex::new(Blocks { last_id: 0, unsent: Vec::new(), held: Vec::new(), polled: None });
/// Records a block and holds a new package's download for up to `HOLD`. Returns whether it was allowed.
pub async fn block(eco: &'static str, pkg: &Package, filter: &'static str, reason: &str) -> bool {
let Some(mut answer) = record(eco, pkg, filter, reason) else {
return false;
};
let allowed = tokio::time::timeout(HOLD, answer.wait_for(|allowed| *allowed)).await;
matches!(allowed, Ok(Ok(_)))
}
/// The app's requests: `blocks`, `allow <id>` or `allow-once <id>`.
/// An allow replies `late` if the download had stopped waiting.
pub fn answer(firewall: &Firewall, config: &Path, request: &str) -> String {
if request == "blocks" {
return serde_json::to_string(&take()).expect("blocks serialize");
}
let result = match request.split_once(' ').map(|(verb, id)| (verb, id.parse())) {
Some(("allow", Ok(id))) => trust(firewall, config, id),
Some(("allow-once", Ok(id))) => allow_once(firewall, id),
_ => Err(format!("unknown message {request}").into()),
};
match result {
Ok(true) => "ok".to_owned(),
Ok(false) => "late".to_owned(),
Err(error) => format!("error: {error}"),
}
}
/// Hands each block over once.
fn take() -> Vec<BlockedPackage> {
let mut blocks = lock();
blocks.polled = Some(Instant::now());
std::mem::take(&mut blocks.unsent)
}
fn record(
eco: &'static str,
pkg: &Package,
filter: &'static str,
reason: &str,
) -> Option<watch::Receiver<bool>> {
let mut blocks = lock();
let watched = blocks.polled.is_some_and(|polled| polled.elapsed() < WATCHED);
let holds = filter == "age" && watched;
// A repeat fetch of a held package waits on the same answer.
let waiting = blocks.held.iter().find(|(held, wake)| {
wake.receiver_count() > 0 && held.eco == eco && held.name == pkg.name && held.version == pkg.version
});
if let (true, Some((_, wake))) = (holds, waiting) {
return Some(wake.subscribe());
}
blocks.last_id += 1;
let block = BlockedPackage {
id: blocks.last_id,
eco,
name: pkg.name.clone(),
version: pkg.version.clone(),
filter,
reason: reason.to_owned(),
};
push(&mut blocks.unsent, block.clone());
if filter != "age" {
return None;
}
let (wake, allowed) = watch::channel(false);
push(&mut blocks.held, (block, wake));
holds.then_some(allowed)
}
/// Also saved to the config, so it survives a restart.
fn trust(firewall: &Firewall, config: &Path, id: u64) -> Result<bool, BoxError> {
let block = held(id)?;
let version = block.version.ok_or("only a version can be trusted")?;
config::allow(config, block.eco, &block.name, &version)?;
let package = AllowedPackage { name: block.name, version: Some(version) };
firewall.lift_age_check(block.eco, package, None);
Ok(release(id))
}
fn allow_once(firewall: &Firewall, id: u64) -> Result<bool, BoxError> {
let block = held(id)?;
let package = AllowedPackage { name: block.name, version: block.version };
firewall.lift_age_check(block.eco, package, Some(Instant::now() + ONCE));
Ok(release(id))
}
fn held(id: u64) -> Result<BlockedPackage, BoxError> {
let blocks = lock();
let held = blocks.held.iter().find(|(held, _)| held.id == id);
Ok(held.ok_or(format!("no new package was held back as {id}"))?.0.clone())
}
/// Returns whether a download was still waiting.
fn release(id: u64) -> bool {
let blocks = lock();
let Some((_, wake)) = blocks.held.iter().find(|(held, _)| held.id == id) else {
return false;
};
wake.send_replace(true);
wake.receiver_count() > 0
}
fn push<T>(list: &mut Vec<T>, item: T) {
if list.len() == KEPT {
list.remove(0);
}
list.push(item);
}
fn lock() -> std::sync::MutexGuard<'static, Blocks> {
BLOCKS.lock().unwrap_or_else(|e| e.into_inner())
}
+43 -85
View File
@@ -1,29 +1,30 @@
use crate::policies::registries::{host_of, BUILT_IN};
use crate::policies::registries::{Registry, BUILT_IN};
use directories::ProjectDirs;
use rama::net::uri::Uri;
use serde::Deserialize;
use serde_json::{json, Map, Value};
use serde_json::{Map, Value};
use std::collections::HashMap;
use std::io::{Error, ErrorKind};
use std::num::{NonZeroU16, NonZeroU64};
use std::path::{Path, PathBuf};
use std::path::PathBuf;
pub const DEFAULT_PORT: u16 = 8080;
#[derive(Debug, Deserialize)]
#[serde(default, deny_unknown_fields)]
pub struct FirewallConfig {
pub port: NonZeroU16,
pub port: u16,
/// Allow a package when a filter could not check it.
pub fail_open: bool,
/// 0 turns the age check off.
pub min_age_hours: u64,
pub denylist: DenylistSource,
/// Packages exempt from the age check, by ecosystem: `{"npm": [{"name": "left-pad"}]}`.
/// Packages never screened, by ecosystem: `{"npm": [{"name": "left-pad"}]}`.
pub allow: HashMap<String, Vec<AllowedPackage>>,
pub telemetry: bool,
/// Mirrors laid out like a built-in registry, by its name: `{"npm": ["https://npm.example.com/"]}`.
pub registries: HashMap<String, Vec<String>>,
/// Reports installs to, and takes blocks from, a Strix workspace.
pub platform: Option<PlatformConfig>,
/// Not describable in the file yet, so this is always the built-in table.
#[serde(skip)]
pub registries: Vec<&'static Registry>,
}
#[derive(Debug, Deserialize)]
@@ -34,6 +35,15 @@ pub struct AllowedPackage {
pub version: Option<String>,
}
#[derive(Debug, Clone, Deserialize)]
#[serde(deny_unknown_fields)]
pub struct PlatformConfig {
pub api_key: String,
/// Where a self-hosted Strix lives.
#[serde(default = "hosted")]
pub url: String,
}
#[derive(Debug, Clone, Deserialize)]
#[serde(default, deny_unknown_fields)]
pub struct DenylistSource {
@@ -41,19 +51,20 @@ pub struct DenylistSource {
pub base: String,
/// Polled for a new commit, which re-fetches every list in use.
pub revision: String,
pub poll_secs: NonZeroU64,
pub poll_secs: u64,
}
impl Default for FirewallConfig {
fn default() -> Self {
FirewallConfig {
port: NonZeroU16::new(DEFAULT_PORT).unwrap(),
port: DEFAULT_PORT,
fail_open: true,
min_age_hours: 24,
min_age_hours: 0,
denylist: DenylistSource::default(),
allow: HashMap::new(),
telemetry: true,
registries: HashMap::new(),
platform: None,
registries: BUILT_IN.to_vec(),
}
}
}
@@ -64,7 +75,7 @@ impl Default for DenylistSource {
base: "https://raw.githubusercontent.com/usestrix/firewall-blocklist/main".into(),
revision: "https://api.github.com/repos/usestrix/firewall-blocklist/commits/main"
.into(),
poll_secs: NonZeroU64::new(10).unwrap(),
poll_secs: 10,
}
}
}
@@ -88,8 +99,7 @@ impl FirewallConfig {
};
let invalid = |e| Error::new(ErrorKind::InvalidData, format!("{}: {e}", path.display()));
let layer: Value = serde_json::from_str(&text).map_err(invalid)?;
let config = FirewallConfig::deserialize(&layer).map_err(invalid)?;
check(&config).map_err(|e| Error::new(ErrorKind::InvalidData, format!("{}: {e}", path.display())))?;
FirewallConfig::deserialize(&layer).map_err(invalid)?;
let Value::Object(layer) = layer else {
unreachable!("a config parses only from an object");
};
@@ -99,8 +109,24 @@ impl FirewallConfig {
}
pub fn local_url(&self, path: &str) -> String {
crate::local_url(self.port.get(), path)
crate::local_url(self.port, path)
}
/// Without building a `Firewall`, which needs a runtime.
pub fn hosts(&self) -> Vec<&'static str> {
let mut hosts: Vec<&'static str> = Vec::new();
for registry in &self.registries {
let host = registry.host();
if !hosts.contains(&host) {
hosts.push(host);
}
}
hosts
}
}
fn hosted() -> String {
"https://app.usestrix.com".into()
}
pub fn path() -> Option<PathBuf> {
@@ -119,71 +145,3 @@ fn merge(base: &mut Map<String, Value>, top: Map<String, Value>) {
}
}
}
/// Adds an `allow` entry to the file, leaving the rest of it as written.
pub fn allow(path: &Path, eco: &str, name: &str, version: &str) -> std::io::Result<()> {
let invalid = |e: String| Error::new(ErrorKind::InvalidData, format!("{}: {e}", path.display()));
let mut config = match std::fs::read_to_string(path) {
Ok(text) => serde_json::from_str(&text).map_err(|e| invalid(e.to_string()))?,
Err(e) if e.kind() == ErrorKind::NotFound => json!({}),
Err(e) => return Err(e),
};
if !config.is_object() {
return Err(invalid("not an object".into()));
}
let entry = json!({ "name": name, "version": version });
let entries = &mut config["allow"][eco];
if entries.is_null() {
*entries = Value::Array(Vec::new());
}
let Some(entries) = entries.as_array_mut() else {
return Err(invalid(format!("allow.{eco} is not a list")));
};
if !entries.contains(&entry) {
entries.push(entry);
}
if let Some(dir) = path.parent() {
std::fs::create_dir_all(dir)?;
}
std::fs::write(path, serde_json::to_string_pretty(&config)?)
}
/// What serde's types cannot say.
fn check(config: &FirewallConfig) -> Result<(), String> {
// `Duration::hours` panics past this.
if config.min_age_hours > time::Duration::MAX.whole_hours() as u64 {
return Err(format!("{} hours is too long", config.min_age_hours));
}
for eco in config.allow.keys() {
if !BUILT_IN.iter().any(|r| r.eco == eco) {
return Err(format!("unknown ecosystem {eco:?} in allow"));
}
}
for url in [&config.denylist.base, &config.denylist.revision] {
if parse_url(url, &["http", "https"]).is_none() {
return Err(format!("{url:?} is not an http(s) URL"));
}
}
for (name, mirrors) in &config.registries {
if !BUILT_IN.iter().any(|r| r.name() == name) {
return Err(format!("no built-in registry is named {name}"));
}
if let Some(url) = mirrors.iter().find(|url| !is_mirror(url)) {
return Err(format!("{url}: a mirror is an https:// URL ending in /"));
}
}
Ok(())
}
/// No port or userinfo, as `host_of` is what gets intercepted.
fn is_mirror(url: &str) -> bool {
let Some(uri) = parse_url(url, &["https"]) else { return false };
let bare_host = uri.host_str().is_some_and(|host| host == host_of(url));
bare_host && uri.query().is_none() && uri.fragment().is_none() && url.ends_with('/')
}
fn parse_url(url: &str, schemes: &[&str]) -> Option<Uri> {
let uri = Uri::parse(url).ok()?;
let has_host = uri.host_str().is_some_and(|host| !host.is_empty());
(has_host && schemes.contains(&uri.scheme_str()?)).then_some(uri)
}
+7 -50
View File
@@ -1,4 +1,4 @@
use crate::config::{AllowedPackage, FirewallConfig};
use crate::config::FirewallConfig;
use crate::policies::filters::age::Age;
use crate::policies::filters::denylist::Denylist;
use crate::policies::filters::osv::Osv;
@@ -6,16 +6,11 @@ use crate::policies::filters::Filter;
use crate::policies::registries::*;
use regex::Regex;
use std::collections::HashMap;
use std::sync::Mutex;
use std::time::Instant;
pub struct Firewall {
pub config: FirewallConfig,
registries: Vec<&'static Registry>,
patterns: HashMap<&'static str, Vec<Regex>>,
filters: Vec<Box<dyn Filter>>,
/// Each lift expires at its time, or lasts until the firewall stops. Never saved.
age_lifted: Mutex<Vec<(String, AllowedPackage, Option<Instant>)>>,
}
impl Default for Firewall {
@@ -26,19 +21,18 @@ impl Default for Firewall {
impl Firewall {
pub fn new(config: FirewallConfig) -> Self {
let registries = with_mirrors(&config.registries);
let mut patterns = HashMap::new();
for registry in &registries {
for registry in &config.registries {
let compiled = registry.patterns.iter().map(|p| Regex::new(p.re).expect(p.re));
patterns.insert(registry.prefix, compiled.collect());
}
let ecosystems = registries.iter().map(|r| r.osv_name);
let ecosystems = config.registries.iter().map(|r| r.osv_name);
let denylist = Denylist::new(config.denylist.clone(), ecosystems);
let mut filters: Vec<Box<dyn Filter>> = vec![Box::new(denylist), Box::new(Osv)];
if config.min_age_hours > 0 {
filters.push(Box::new(Age::new(config.min_age_hours)));
}
Firewall { config, registries, patterns, filters, age_lifted: Mutex::default() }
Firewall { config, patterns, filters }
}
pub fn match_on<'a>(
@@ -46,27 +40,15 @@ impl Firewall {
url: &'a str,
key: fn(&Registry) -> &'static str,
) -> Option<(&'static Registry, &'a str)> {
self.registries.iter().find_map(|r| url.strip_prefix(key(r)).map(|rest| (*r, rest)))
self.config.registries.iter().find_map(|r| url.strip_prefix(key(r)).map(|rest| (*r, rest)))
}
pub fn hosts(&self) -> Vec<&'static str> {
let mut hosts: Vec<&'static str> = Vec::new();
for registry in &self.registries {
let host = registry.host();
if !hosts.contains(&host) {
hosts.push(host);
}
}
hosts
}
pub fn is_https_url(&self, url: &str) -> bool {
let host = host_of(url);
self.registries.iter().any(|r| r.upstream.starts_with("https://") && r.host() == host)
self.config.hosts()
}
pub fn is_index_url(&self, url: &str) -> bool {
self.registries.iter().any(|r| r.index && r.host() == host_of(url))
self.config.registries.iter().any(|r| r.index && r.host() == host_of(url))
}
pub fn resolve(&self, registry: &'static Registry, rest: &str) -> Resolved {
@@ -76,29 +58,4 @@ impl Firewall {
pub fn filters(&self) -> &[Box<dyn Filter>] {
&self.filters
}
pub fn lift_age_check(&self, eco: &str, package: AllowedPackage, until: Option<Instant>) {
let mut lifted = self.age_lifted.lock().unwrap_or_else(|e| e.into_inner());
lifted.retain(|(_, _, until)| until.is_none_or(|until| until > Instant::now()));
lifted.push((eco.to_owned(), package, until));
}
pub fn age_check_lifted(&self, eco: &str, matches: impl Fn(&AllowedPackage) -> bool) -> bool {
let lifted = self.age_lifted.lock().unwrap_or_else(|e| e.into_inner());
lifted.iter().any(|(e, package, until)| {
e == eco && until.is_none_or(|until| until > Instant::now()) && matches(package)
})
}
}
/// The built-ins, then a copy of one per mirror. Leaked, as a `Registry` is `'static` everywhere.
fn with_mirrors(mirrors: &HashMap<String, Vec<String>>) -> Vec<&'static Registry> {
let mut registries = BUILT_IN.to_vec();
for built_in in BUILT_IN {
for upstream in mirrors.get(built_in.name()).into_iter().flatten() {
let upstream = upstream.clone().leak();
registries.push(Box::leak(Box::new(Registry { upstream, ..(*built_in).clone() })));
}
}
registries
}
+1 -1
View File
@@ -1,10 +1,10 @@
pub mod aliasing;
pub mod blocks;
pub mod config;
pub mod firewall;
pub mod http;
pub mod mitm;
pub mod os;
mod platform;
pub mod policies;
pub mod proxy;
pub mod telemetry;
+13
View File
@@ -12,6 +12,10 @@ fn main() {
firewall::init_logging("info");
serve()
}
if matches.subcommand_matches("uninstall").is_some() {
firewall::init_logging("info");
uninstall()
}
let mut command = matches.get_many::<String>("COMMAND").unwrap().cloned();
let program = command.next().unwrap();
firewall::init_logging("warn");
@@ -40,6 +44,8 @@ fn options() -> Command {
Command::new("serve")
.about("Serve a local registry for package managers configured to use it"),
)
// Run as root by the macOS app's uninstall.
.subcommand(Command::new("uninstall").hide(true))
.arg(
Arg::new("COMMAND")
.help("A command to run with its package downloads screened")
@@ -70,6 +76,13 @@ fn serve() -> ! {
}
}
fn uninstall() -> ! {
match firewall::os::uninstall() {
Ok(()) => exit(0),
Err(e) => fail("uninstall", &format!("could not uninstall: {e}")),
}
}
fn run(invocation: Invocation) -> ! {
telemetry::set_mode("wrapper");
let command = &invocation.program;
+2 -4
View File
@@ -8,7 +8,7 @@ use rcgen::{
use std::sync::Arc;
use time::{Duration, OffsetDateTime};
/// Held in the Secure Enclave on macOS, the TPM on Windows, in memory elsewhere.
/// Held in the Secure Enclave on macOS, in memory elsewhere.
pub type CaSigner = Arc<dyn SigningKey + Send + Sync>;
pub struct CertificateAuthority {
@@ -61,14 +61,12 @@ pub fn crl(hosts: &[&str], signer: &dyn SigningKey) -> Result<Vec<u8>, BoxError>
}
pub const COMMON_NAME: &str = "Strix Firewall";
/// With `COMMON_NAME`, how a trust store entry is recognized as ours.
pub const ORGANIZATION: &str = "Strix";
/// Also used by the issuer, whose issuer name must match the CA's subject.
pub fn params(hosts: &[&str]) -> CertificateParams {
let mut name = DistinguishedName::new();
name.push(DnType::CommonName, COMMON_NAME);
name.push(DnType::OrganizationName, ORGANIZATION);
name.push(DnType::OrganizationName, "Strix");
let mut params = CertificateParams::default();
params.distinguished_name = name;
+1 -1
View File
@@ -3,7 +3,7 @@ mod issuer;
mod route;
mod screen;
pub use ca::{crl, CaSigner, CertificateAuthority, COMMON_NAME, ORGANIZATION};
pub use ca::{crl, CaSigner, CertificateAuthority, COMMON_NAME};
use crate::Firewall;
use issuer::ConstrainedCertIssuer;
+4 -5
View File
@@ -5,7 +5,7 @@ mod uninstall;
pub use uninstall::uninstall;
use crate::config::FirewallConfig;
use crate::{blocks, mitm, telemetry};
use crate::{mitm, telemetry};
use crate::Firewall;
use rama::bytes::Bytes;
use rama::error::BoxError;
@@ -39,7 +39,6 @@ const CONFIG_FILE: &str = "/Library/Application Support/Firewall/config.json";
struct Handler {
ca: Arc<mitm::CertificateAuthority>,
hosts: Vec<&'static str>,
firewall: Arc<Firewall>,
service: mitm::MitmService,
}
@@ -59,7 +58,7 @@ impl TransparentProxyHandler for Handler {
let message = String::from_utf8_lossy(&message).into_owned();
Some(Bytes::from(match message.as_str() {
"ca" => self.ca.pem.clone(),
other => blocks::answer(&self.firewall, CONFIG_FILE.as_ref(), other),
other => format!("error: unknown message {other}"),
}))
}
@@ -114,8 +113,8 @@ fn handler(exec: Executor) -> Result<Handler, BoxError> {
let signer: mitm::CaSigner = Arc::new(key);
let ca = install::certificate_authority(&hosts, &*signer);
let ca = Arc::new(ca.inspect_err(|_| telemetry::error("ca"))?);
let service = mitm::mitm_service(firewall.clone(), &ca, signer, None, exec);
Ok(Handler { ca, hosts, firewall, service })
let service = mitm::mitm_service(firewall, &ca, signer, None, exec);
Ok(Handler { ca, hosts, service })
}
/// stderr is invisible in a system extension, so events go to the unified log:
+8 -6
View File
@@ -1,14 +1,16 @@
#[cfg(target_os = "macos")]
pub mod macos;
#[cfg(windows)]
pub mod windows;
#[cfg(target_os = "macos")]
pub use macos::system_config;
#[cfg(windows)]
pub use windows::system_config;
pub use macos::{system_config, uninstall};
#[cfg(not(any(target_os = "macos", windows)))]
/// Elsewhere nothing is installed system-wide.
#[cfg(not(target_os = "macos"))]
pub fn uninstall() -> Result<(), rama::error::BoxError> {
Ok(())
}
#[cfg(not(target_os = "macos"))]
pub fn system_config() -> Option<std::path::PathBuf> {
None
}
-150
View File
@@ -1,150 +0,0 @@
use super::*;
use crate::mitm::{CertificateAuthority, COMMON_NAME, ORGANIZATION};
use rama::tls::boring::core::nid::Nid;
use rama::tls::boring::core::x509::X509;
use rcgen::SigningKey;
use schannel::cert_context::CertContext;
use schannel::cert_store::{CertAdd, CertStore};
use std::io;
use std::path::Path;
use std::time::{SystemTime, UNIX_EPOCH};
use tracing::warn;
use windows::Win32::Security::Authorization::{GetNamedSecurityInfoW, SE_FILE_OBJECT};
use windows::Win32::Security::*;
use windows::Win32::Storage::FileSystem::CreateDirectoryW;
use windows_registry::Type;
/// SYSTEM and admins write, users only read, so no one else can plant a CA for node.
const DATA_DIR_ACL: &str = concat!(
"O:BA", // owner: Administrators
"D:P", // protected: ignore ProgramData's rules, which let any user create files
"(A;OICI;FA;;;SY)", // allow SYSTEM full control, inherited by files (OI) and subfolders (CI)
"(A;OICI;FA;;;BA)", // allow Administrators full control
"(A;OICI;FRFX;;;BU)", // allow Users read and execute only
);
/// 1970 in FILETIME, which counts 100 ns from 1601.
const FILETIME_UNIX_EPOCH: u128 = 116_444_736_000_000_000;
/// Trusted machine-wide so restarts keep it; replaced if the hosts change.
pub fn load_or_create_ca(
hosts: &[&str],
signer: &dyn SigningKey,
) -> Result<CertificateAuthority, BoxError> {
let stored = read_registry_string(REGISTRY_KEY, "ca")?;
let ca = match stored.and_then(|blob| CertificateAuthority::from_blob(&blob, hosts, signer)) {
Some(ca) => ca,
None => {
warn!(?hosts, "minting a new CA");
let ca = CertificateAuthority::generate(hosts, signer)?;
LOCAL_MACHINE
.create(REGISTRY_KEY)?
.set_string("ca", ca.to_blob(hosts))?;
// Windows discards CRLs it cached before now, in case an old CA's is cached at our URL.
let now = SystemTime::now().duration_since(UNIX_EPOCH)?.as_nanos() / 100
+ FILETIME_UNIX_EPOCH;
let chain = r"SOFTWARE\Microsoft\Cryptography\OID\EncodingType 0\CertDllCreateCertificateChainEngine\Config";
let resync = (now as u64).to_le_bytes();
LOCAL_MACHINE.create(chain)?.set_bytes(
"ChainCacheResyncFiletime",
Type::Bytes,
&resync,
)?;
ca
}
};
// Idempotent, and the registry value can outlive the certificate.
let der = ca.crt.to_der()?;
let mut store = CertStore::open_local_machine("Root")?;
store.add_cert(&CertContext::new(&der)?, CertAdd::ReplaceExisting)?;
remove_our_cas_except(Some(&der))?;
// For clients that read no trust store; screening still works for the rest if this fails.
let exported = secure_data_dir().and_then(|dir| std::fs::write(dir.join("ca.pem"), &ca.pem));
if let Err(error) = exported {
warn!(%error, "could not export the CA");
}
Ok(ca)
}
/// Created on first use with its ACL, which is reset every time. One a user made first, or a link,
/// is replaced: its owner could grant itself access again, and a link would redirect our writes.
pub(super) fn secure_data_dir() -> io::Result<PathBuf> {
let dir = data_dir();
let exists = match std::fs::symlink_metadata(&dir) {
Ok(meta) if meta.file_type().is_symlink() => {
std::fs::remove_dir(&dir)?;
false
}
Ok(_) if !owned_by_admins(&dir)? => {
warn!(dir = %dir.display(), "replacing a data folder not created by an admin");
std::fs::remove_dir_all(&dir)?;
false
}
Ok(_) => true,
Err(_) => false,
};
let info = OWNER_SECURITY_INFORMATION
| DACL_SECURITY_INFORMATION
| PROTECTED_DACL_SECURITY_INFORMATION;
let path = HSTRING::from(dir.as_path());
let acl = security_descriptor(DATA_DIR_ACL)?;
if exists {
unsafe { SetFileSecurityW(&path, info, PSECURITY_DESCRIPTOR(acl.0)).ok()? };
} else {
let attributes = SECURITY_ATTRIBUTES {
nLength: size_of::<SECURITY_ATTRIBUTES>() as u32,
lpSecurityDescriptor: acl.0,
bInheritHandle: false.into(),
};
// Never inherits ProgramData's ACL, which lets users add files; fails if it was recreated.
unsafe { CreateDirectoryW(&path, Some(&attributes))? };
}
Ok(dir)
}
/// By SYSTEM or the Administrators group, as what an elevated process creates is.
fn owned_by_admins(path: &Path) -> windows::core::Result<bool> {
let (mut owner, mut descriptor) = (PSID::default(), PSECURITY_DESCRIPTOR::default());
unsafe {
GetNamedSecurityInfoW(
&HSTRING::from(path),
SE_FILE_OBJECT,
OWNER_SECURITY_INFORMATION,
Some(&mut owner),
None,
None,
None,
&mut descriptor,
)
.ok()?
};
let admins = [WinBuiltinAdministratorsSid, WinLocalSystemSid];
let owned = admins
.into_iter()
.any(|sid| unsafe { IsWellKnownSid(owner, sid) }.as_bool());
// `owner` points into the descriptor, so it is freed last.
unsafe { LocalFree(Some(HLOCAL(descriptor.0))) };
Ok(owned)
}
/// Drops every CA of ours from LocalMachine\Root but `keep`.
pub(super) fn remove_our_cas_except(keep: Option<&[u8]>) -> Result<(), BoxError> {
for cert in CertStore::open_local_machine("Root")?.certs() {
if keep != Some(cert.to_der()) && is_our_ca(cert.to_der()) {
cert.delete()?;
}
}
Ok(())
}
fn is_our_ca(der: &[u8]) -> bool {
let Ok(crt) = X509::from_der(der) else {
return false;
};
let name = |nid| {
let entry = crt.subject_name().entries_by_nid(nid).next()?;
Some(entry.data().as_utf8().ok()?.to_string())
};
name(Nid::COMMONNAME).as_deref() == Some(COMMON_NAME)
&& name(Nid::ORGANIZATIONNAME).as_deref() == Some(ORGANIZATION)
}
-136
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@@ -1,136 +0,0 @@
//! The hosts file sends each registry host to its own loopback address, where a
//! LocalSystem service screens it as the macOS extension does.
mod ca;
mod pipe;
mod service;
mod tpm;
mod tray;
mod uninstall;
pub use service::run as run_service;
pub use tpm::CaKey;
pub use tray::run as run_tray;
pub use uninstall::uninstall;
use rama::error::BoxError;
use std::net::Ipv4Addr;
use std::path::PathBuf;
use windows::core::{Owned, GUID, HSTRING};
use windows::Win32::Foundation::{LocalFree, ERROR_FILE_NOT_FOUND, HLOCAL};
use windows::Win32::Security::Authorization::*;
use windows::Win32::Security::PSECURITY_DESCRIPTOR;
use windows::Win32::System::Com::CoTaskMemFree;
use windows::Win32::System::Environment::ExpandEnvironmentStringsW;
use windows::Win32::UI::Shell::*;
use windows_registry::LOCAL_MACHINE;
const SERVICE_NAME: &str = "StrixFirewall";
/// Admin-only, so it holds the CA as the System keychain does on macOS.
const REGISTRY_KEY: &str = r"SOFTWARE\Strix Firewall";
/// Serves the CRL our leaves point at; schannel fails closed without one.
const CRL_ADDRESS: Ipv4Addr = Ipv4Addr::new(127, 0, 0, 2);
/// Admin-only; holds the exported CA, the service log and the config.
fn data_dir() -> PathBuf {
known_folder(&FOLDERID_ProgramData).join("Strix Firewall")
}
/// Admin-only, so users cannot relax what the service screens.
fn config_file() -> PathBuf {
data_dir().join("config.json")
}
pub fn system_config() -> Option<PathBuf> {
Some(config_file())
}
/// In the folder Windows reads it from, normally %SystemRoot%\System32\drivers\etc.
fn hosts_file() -> PathBuf {
let key = r"SYSTEM\CurrentControlSet\Services\Tcpip\Parameters";
let configured = LOCAL_MACHINE
.open(key)
.and_then(|key| key.get_hstring("DataBasePath"));
let dir = match configured {
Ok(dir) => expand_environment(&dir),
Err(_) => known_folder(&FOLDERID_System).join(r"drivers\etc"),
};
dir.join("hosts")
}
/// Windows always has its known folders.
fn known_folder(id: &GUID) -> PathBuf {
let path = unsafe { SHGetKnownFolderPath(id, KF_FLAG_DEFAULT, None) }.expect("a known folder");
let dir = PathBuf::from(unsafe { path.to_hstring() }.to_os_string());
unsafe { CoTaskMemFree(Some(path.0 as *const _)) };
dir
}
fn expand_environment(path: &HSTRING) -> PathBuf {
let len = unsafe { ExpandEnvironmentStringsW(path, None) };
let mut expanded = vec![0; len as usize];
let len = unsafe { ExpandEnvironmentStringsW(path, Some(&mut expanded)) };
// Less the terminating null.
PathBuf::from(String::from_utf16_lossy(
&expanded[..(len as usize).saturating_sub(1)],
))
}
/// From 127.0.0.3, leaving 127.0.0.1 to whatever else serves locally.
fn loopback_addresses(hosts: &[&'static str]) -> Vec<(Ipv4Addr, &'static str)> {
(3..)
.zip(hosts)
.map(|(i, host)| (Ipv4Addr::new(127, 0, 0, i), *host))
.collect()
}
/// Points each host at its listener, replacing the lines we wrote before; with none, only removes
/// them. Bytes, as the file needn't be UTF-8, and every other line is kept as it was.
fn write_hosts_entries(hosts: &[&'static str]) -> std::io::Result<()> {
const TAG: &str = " # Strix Firewall";
let old = std::fs::read(hosts_file())?;
let ours = |line: &&[u8]| line.trim_ascii_end().ends_with(TAG.as_bytes());
let lines = old.split_inclusive(|&byte| byte == b'\n');
let mut new: Vec<u8> = lines
.filter(|line| !ours(line))
.flatten()
.copied()
.collect();
if !new.is_empty() && !new.ends_with(b"\n") {
new.extend_from_slice(b"\r\n");
}
for (address, host) in loopback_addresses(hosts) {
new.extend_from_slice(format!("{address} {host}{TAG}\r\n").as_bytes());
}
std::fs::write(hosts_file(), new)
}
/// Parses `sddl`; freed on drop.
fn security_descriptor(sddl: &str) -> windows::core::Result<Owned<HLOCAL>> {
let mut descriptor = PSECURITY_DESCRIPTOR::default();
unsafe {
ConvertStringSecurityDescriptorToSecurityDescriptorW(
&HSTRING::from(sddl),
SDDL_REVISION_1,
&mut descriptor,
None,
)?
};
Ok(unsafe { Owned::new(HLOCAL(descriptor.0)) })
}
fn read_registry_string(key: &str, value: &str) -> Result<Option<String>, BoxError> {
none_if_missing(
LOCAL_MACHINE
.open(key)
.and_then(|key| key.get_string(value)),
)
}
/// `None` for a missing key or value.
fn none_if_missing<T>(result: windows_registry::Result<T>) -> Result<Option<T>, BoxError> {
match result {
Err(error) if error.code() == ERROR_FILE_NOT_FOUND.to_hresult() => Ok(None),
result => Ok(Some(result?)),
}
}
-102
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@@ -1,102 +0,0 @@
//! How the tray asks the service what it blocked, and allows a new package, as the macOS app
//! messages its extension.
use super::{config_file, security_descriptor};
use crate::{blocks, Firewall};
use rama::error::BoxError;
use std::os::windows::io::AsRawHandle;
use std::sync::Arc;
use std::time::Duration;
use tokio::io::{AsyncBufReadExt, AsyncReadExt, AsyncWriteExt, BufReader};
use tokio::net::windows::named_pipe::{NamedPipeServer, ServerOptions};
use windows::core::{Owned, PWSTR};
use windows::Win32::Foundation::HANDLE;
use windows::Win32::Security::*;
use windows::Win32::System::Pipes::{GetNamedPipeClientProcessId, ImpersonateNamedPipeClient};
use windows::Win32::System::Threading::*;
pub(super) const PIPE: &str = r"\\.\pipe\StrixFirewall";
/// Signed-in users can connect, as the tray runs as them.
const PIPE_ACL: &str = "D:P(A;;GA;;;SY)(A;;GA;;;BA)(A;;GRGW;;;IU)";
pub(super) async fn serve(firewall: Arc<Firewall>) -> Result<(), BoxError> {
let mut server = create(true)?;
loop {
server.connect().await?;
let client = std::mem::replace(&mut server, create(false)?);
let firewall = Arc::clone(&firewall);
tokio::spawn(async move {
if let Err(error) = answer(client, &firewall).await {
tracing::debug!(%error, "could not answer the tray");
}
});
}
}
fn create(first: bool) -> Result<NamedPipeServer, BoxError> {
let acl = security_descriptor(PIPE_ACL)?;
let mut attributes = SECURITY_ATTRIBUTES {
nLength: size_of::<SECURITY_ATTRIBUTES>() as u32,
lpSecurityDescriptor: acl.0,
bInheritHandle: false.into(),
};
let attributes = (&raw mut attributes).cast();
let mut options = ServerOptions::new();
// Fails if anyone else made the pipe first.
options.first_pipe_instance(first);
Ok(unsafe { options.create_with_security_attributes_raw(PIPE, attributes)? })
}
/// A line each way.
async fn answer(client: NamedPipeServer, firewall: &Firewall) -> Result<(), BoxError> {
let mut client = BufReader::new(client);
let mut request = String::new();
(&mut client)
.take(64 * 1024)
.read_line(&mut request)
.await?;
let request = request.trim_end();
// Only the app can message the macOS extension; here any program could connect.
let reply = if !client_is_tray(client.get_ref())? {
"error: only the tray can ask".to_owned()
} else if request.starts_with("allow ") && !client_is_admin(client.get_ref())? {
"error: trusting a package takes an administrator".to_owned()
} else {
blocks::answer(firewall, &config_file(), request)
};
client.write_all(format!("{reply}\n").as_bytes()).await?;
// Closing before the tray hangs up could discard the reply.
let _ = tokio::time::timeout(Duration::from_secs(5), client.read(&mut [0])).await;
Ok(())
}
fn client_is_tray(client: &NamedPipeServer) -> Result<bool, BoxError> {
let mut id = 0;
unsafe { GetNamedPipeClientProcessId(HANDLE(client.as_raw_handle()), &mut id)? };
let process = unsafe { Owned::new(OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, id)?) };
let mut path = [0u16; 1024];
let mut len = path.len() as u32;
let flags = PROCESS_NAME_WIN32;
unsafe { QueryFullProcessImageNameW(*process, flags, PWSTR(path.as_mut_ptr()), &mut len)? };
let path = String::from_utf16(&path[..len as usize])?;
let tray = std::env::current_exe()?.with_file_name("firewall-tray.exe");
// Windows paths ignore case.
Ok(path.to_lowercase() == tray.to_string_lossy().to_lowercase())
}
/// Elevated, as only an elevated token has the Administrators group enabled.
fn client_is_admin(client: &NamedPipeServer) -> windows::core::Result<bool> {
let mut sid = [0u32; SECURITY_MAX_SID_SIZE as usize / 4];
let admins = PSID(sid.as_mut_ptr().cast());
let mut size = SECURITY_MAX_SID_SIZE;
unsafe { CreateWellKnownSid(WinBuiltinAdministratorsSid, None, Some(admins), &mut size)? };
unsafe { ImpersonateNamedPipeClient(HANDLE(client.as_raw_handle()))? };
let mut member = false.into();
let checked = unsafe { CheckTokenMembership(None, admins, &mut member) };
// Carrying on as the client would be worse than stopping.
if unsafe { RevertToSelf() }.is_err() {
std::process::abort();
}
checked?;
Ok(member.as_bool())
}
-258
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@@ -1,258 +0,0 @@
use super::ca::{load_or_create_ca, secure_data_dir};
use super::tpm::CaKey;
use super::{
config_file, loopback_addresses, pipe, write_hosts_entries, CRL_ADDRESS, SERVICE_NAME,
};
use crate::config::FirewallConfig;
use crate::http::{reply, text};
use crate::{mitm, telemetry, Firewall};
use rama::dns::client::hickory::resolver::config::ResolveHosts;
use rama::dns::client::hickory::{default_resolver_opts, HickoryDnsResolver};
use rama::dns::client::resolver::DnsAddressResolver;
use rama::dns::client::try_init_global_dns_resolver;
use rama::error::BoxError;
use rama::http::server::HttpServer;
use rama::http::{Request, Response};
use rama::io::BridgeIo;
use rama::layer::ConsumeErrLayer;
use rama::net::address::Domain;
use rama::rt::Executor;
use rama::service::service_fn;
use rama::tcp::server::TcpListener;
use rama::tcp::TcpStream;
use rama::{Layer, Service};
use rcgen::SigningKey;
use std::convert::Infallible;
use std::ffi::OsString;
use std::net::{IpAddr, Ipv4Addr};
use std::sync::Arc;
use std::time::Duration;
use tracing_appender::rolling::{RollingFileAppender, Rotation};
use windows::Win32::Foundation::ERROR_GEN_FAILURE;
use windows_service::service::*;
use windows_service::service_control_handler::{
self, ServiceControlHandlerResult, ServiceStatusHandle,
};
use windows_service::{define_windows_service, service_dispatcher};
const CRL_PATH: &str = "/ca.crl";
define_windows_service!(ffi_service_main, service_main);
/// Called by the service control manager, never by hand.
pub fn run() -> windows_service::Result<()> {
service_dispatcher::start(SERVICE_NAME, ffi_service_main)
}
/// stderr goes nowhere in a service, so events go to a file beside the CA.
fn service_main(_arguments: Vec<OsString>) {
let log = secure_data_dir().ok().and_then(|dir| {
RollingFileAppender::builder()
.rotation(Rotation::DAILY)
.filename_prefix("firewall")
.filename_suffix("log")
.max_log_files(7)
.build(dir)
.ok()
});
if let Some(appender) = log {
let filter = crate::log_filter("info");
let _ = tracing_subscriber::fmt()
.with_env_filter(filter)
.with_ansi(false)
.with_writer(appender)
.try_init();
}
std::panic::set_hook(Box::new(|panic| tracing::error!("{panic}")));
if let Err(error) = run_until_stopped() {
tracing::error!(%error, "the service stopped");
}
}
fn run_until_stopped() -> Result<(), BoxError> {
let (control_sender, mut control_receiver) = tokio::sync::mpsc::unbounded_channel();
let status = service_control_handler::register(SERVICE_NAME, move |control| match control {
ServiceControl::Stop
| ServiceControl::Shutdown
| ServiceControl::Pause
| ServiceControl::Continue => {
// Answered once handled, so a failed pause fails the caller's ControlService.
let (reply, handled) = tokio::sync::oneshot::channel();
let _ = control_sender.send((control, reply));
handled
.blocking_recv()
.unwrap_or(ServiceControlHandlerResult::NoError)
}
ServiceControl::Interrogate => ServiceControlHandlerResult::NoError,
_ => ServiceControlHandlerResult::NotImplemented,
})?;
set_status(&status, ServiceState::StartPending, false)?;
let served = crate::runtime()?.block_on(async {
let hosts = match start_screening(&status).await {
Ok(hosts) => hosts,
Err(error) => {
telemetry::send().await;
return Err(error);
}
};
// Only pausing removes our hosts entries; a stop or crash keeps them, failing closed.
while let Some((control, reply)) = control_receiver.recv().await {
let (hosts, state) = match control {
ServiceControl::Pause => (&[][..], ServiceState::Paused),
ServiceControl::Continue => (&hosts[..], ServiceState::Running),
_ => break,
};
let result = match write_hosts_entries(hosts) {
Ok(()) => {
set_status(&status, state, false)?;
ServiceControlHandlerResult::NoError
}
Err(error) => {
tracing::error!(%error, "could not rewrite the hosts file");
let code = error
.raw_os_error()
.map_or(ERROR_GEN_FAILURE.0, |code| code as u32);
ServiceControlHandlerResult::Other(code)
}
};
let _ = reply.send(result);
}
Ok::<_, BoxError>(())
});
// A failed stop is what makes the service manager restart it.
set_status(&status, ServiceState::Stopped, served.is_err())?;
served
}
async fn start_screening(status: &ServiceStatusHandle) -> Result<Vec<&'static str>, BoxError> {
telemetry::set_mode("service");
telemetry::heartbeat();
// Never the hosts file, which points back at us; the Firewall's lookups included.
let mut options = default_resolver_opts();
options.use_hosts_file = ResolveHosts::Never;
let resolver = HickoryDnsResolver::try_new_system_with_options(options)?;
let _ = try_init_global_dns_resolver(resolver.clone());
let config =
FirewallConfig::load_from(&[config_file()]).inspect_err(|_| telemetry::error("config"))?;
let firewall = Arc::new(Firewall::new(config));
let hosts = firewall.hosts();
let key = CaKey::load_or_create().inspect_err(|_| telemetry::error("tpm"))?;
let signer: mitm::CaSigner = Arc::new(key);
let ca = load_or_create_ca(&hosts, &*signer).inspect_err(|_| telemetry::error("ca"))?;
let exec = Executor::default();
// An empty CRL for the leaves to point at, signed fresh for each fetch.
let crl_url = format!("http://{CRL_ADDRESS}{CRL_PATH}");
let (crl_hosts, crl_signer) = (hosts.clone(), Arc::clone(&signer));
let crl = service_fn(move |req: Request| {
let response = if req.uri().request_target() == CRL_PATH {
crl_response(&crl_hosts, &*crl_signer)
} else {
text(404, "No route.\n")
};
async move { Ok::<_, Infallible>(response) }
});
let crl = HttpServer::auto(exec.clone()).service(crl);
tokio::spawn(listen_on(CRL_ADDRESS, 80, &exec)?.serve(crl));
let tray_firewall = Arc::clone(&firewall);
tokio::spawn(async move {
if let Err(error) = pipe::serve(tray_firewall).await {
tracing::error!(%error, "the tray cannot reach the service");
}
});
let service = mitm::mitm_service(firewall, &ca, signer, Some(crl_url), exec.clone());
for (address, host) in loopback_addresses(&hosts) {
for port in [80, 443] {
let upstream = RedirectedHost {
host,
port,
resolver: resolver.clone(),
service: service.clone(),
};
let upstream = ConsumeErrLayer::trace_as_warning().into_layer(upstream);
tokio::spawn(listen_on(address, port, &exec)?.serve(upstream));
}
}
// Rewritten on every start, so a restart picks up a changed host list.
write_hosts_entries(&hosts)?;
tracing::info!(?hosts, "screening redirected registry traffic");
set_status(status, ServiceState::Running, false)?;
Ok(hosts)
}
fn crl_response(hosts: &[&str], signer: &dyn SigningKey) -> Response {
match mitm::crl(hosts, signer) {
Ok(der) => reply(200, "application/pkix-crl", der),
Err(error) => text(503, &format!("{error}\n")),
}
}
fn listen_on(address: Ipv4Addr, port: u16, exec: &Executor) -> std::io::Result<TcpListener> {
let bound = std::net::TcpListener::bind((address, port))?;
bound.set_nonblocking(true)?;
TcpListener::try_from_std_tcp_listener(bound, exec.clone())
}
/// Each listener is bound to one host's address, which is how it knows where to connect.
#[derive(Clone)]
struct RedirectedHost {
host: &'static str,
port: u16,
resolver: HickoryDnsResolver,
service: mitm::MitmService,
}
impl Service<TcpStream> for RedirectedHost {
type Output = ();
type Error = BoxError;
async fn serve(&self, ingress: TcpStream) -> Result<(), BoxError> {
let address = self.resolve().await?;
let egress = tokio::net::TcpStream::connect((address, self.port)).await?;
let streams = BridgeIo(ingress, TcpStream::from(egress));
self.service.serve(streams).await
}
}
impl RedirectedHost {
/// IPv4 if it has one, else IPv6.
async fn resolve(&self) -> Result<IpAddr, BoxError> {
let domain = Domain::from_static(self.host);
if let Some(Ok(v4)) = self.resolver.lookup_ipv4_first(domain.clone()).await {
return Ok(v4.into());
}
match self.resolver.lookup_ipv6_first(domain).await {
Some(v6) => Ok(v6?.into()),
None => Err(format!("{} has no address", self.host).into()),
}
}
}
fn set_status(
status: &ServiceStatusHandle,
state: ServiceState,
failed: bool,
) -> windows_service::Result<()> {
status.set_service_status(ServiceStatus {
service_type: ServiceType::OWN_PROCESS,
current_state: state,
controls_accepted: match state {
ServiceState::Running | ServiceState::Paused => {
ServiceControlAccept::STOP
| ServiceControlAccept::SHUTDOWN
| ServiceControlAccept::PAUSE_CONTINUE
}
_ => ServiceControlAccept::empty(),
},
exit_code: if failed {
ServiceExitCode::ServiceSpecific(1)
} else {
ServiceExitCode::Win32(0)
},
checkpoint: 0,
wait_hint: Duration::from_secs(30),
process_id: None,
})
}
-160
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@@ -1,160 +0,0 @@
use rama::error::BoxError;
use rama::tls::boring::core::bn::BigNum;
use rama::tls::boring::core::ecdsa::EcdsaSig;
use rama::tls::boring::core::sha::sha256;
use rcgen::{Error, PublicKeyData, SignatureAlgorithm, SigningKey, PKCS_ECDSA_P256_SHA256};
use windows::core::{Owned, Result as WinResult, HSTRING};
use windows::Win32::Foundation::{NTE_BAD_KEY, NTE_BAD_KEYSET};
use windows::Win32::Security::Cryptography::*;
const KEY_NAME: &str = "Strix Firewall CA";
/// A P-256 key held by the TPM. Signing asks the TPM to sign, so the private key never leaves it.
pub struct CaKey {
// Fields drop in order, so the key handle closes before its provider's.
key_handle: Owned<NCRYPT_KEY_HANDLE>,
_provider_handle: Owned<NCRYPT_PROV_HANDLE>,
/// 0x04 || X || Y, the form rcgen writes into a certificate's SubjectPublicKeyInfo.
public_point: Vec<u8>,
}
impl CaKey {
/// A machine key, so the service and an elevated installer share it.
pub fn load_or_create() -> Result<Self, BoxError> {
match open_key(KEY_NAME, NCRYPT_MACHINE_KEY_FLAG)? {
Some(key) => Ok(key),
None => Ok(create_key(KEY_NAME, NCRYPT_MACHINE_KEY_FLAG)?),
}
}
pub(super) fn delete_machine_key() -> Result<(), BoxError> {
if let Some(key) = open_key(KEY_NAME, NCRYPT_MACHINE_KEY_FLAG)? {
key.delete_from_tpm()?;
}
Ok(())
}
/// A per-user key under a random name, which needs no elevation; `delete_from_tpm` it after.
pub fn create_test_key() -> WinResult<Self> {
let name = format!("Strix Firewall test {:016x}", rand::random::<u64>());
create_key(&name, NCRYPT_FLAGS(0))
}
/// Deletes the key from the TPM, not just this handle to it.
pub fn delete_from_tpm(mut self) -> WinResult<()> {
// NCryptDeleteKey also frees the handle, so the Owned mustn't free it again.
let key_handle = std::mem::take(&mut *self.key_handle);
unsafe { NCryptDeleteKey(key_handle, 0) }
}
/// Takes both handles and reads the key's public point once, for rcgen.
fn from_handles(
provider_handle: Owned<NCRYPT_PROV_HANDLE>,
key_handle: Owned<NCRYPT_KEY_HANDLE>,
) -> WinResult<Self> {
// A BCRYPT_ECCKEY_BLOB header, then X and Y.
const HEADER_LEN: usize = size_of::<BCRYPT_ECCKEY_BLOB>();
let mut blob = [0u8; HEADER_LEN + 64];
let mut blob_len = 0;
unsafe {
NCryptExportKey(
*key_handle,
None,
BCRYPT_ECCPUBLIC_BLOB,
None,
Some(&mut blob),
&mut blob_len,
NCRYPT_FLAGS(0),
)?
};
let (header, x_and_y) = blob.split_at(HEADER_LEN);
let is_p256 = header[..4] == BCRYPT_ECDSA_PUBLIC_P256_MAGIC.to_le_bytes();
if !is_p256 || blob_len as usize != blob.len() {
return Err(windows::core::Error::new(NTE_BAD_KEY, "key is not an ECDSA P-256 key"));
}
let public_point = [&[0x04], x_and_y].concat();
Ok(CaKey { key_handle, _provider_handle: provider_handle, public_point })
}
}
impl PublicKeyData for CaKey {
fn der_bytes(&self) -> &[u8] {
&self.public_point
}
fn algorithm(&self) -> &'static SignatureAlgorithm {
&PKCS_ECDSA_P256_SHA256
}
}
impl SigningKey for CaKey {
fn sign(&self, msg: &[u8]) -> Result<Vec<u8>, Error> {
let mut r_and_s = [0u8; 64];
let mut signature_len = 0;
let signed = unsafe {
NCryptSignHash(
*self.key_handle,
None,
&sha256(msg),
Some(&mut r_and_s),
&mut signature_len,
NCRYPT_SILENT_FLAG,
)
};
signed.map_err(|_| Error::RemoteKeyError)?;
// NCrypt returns r || s, each half the length; X.509 wants DER SEQUENCE { r, s }.
let (r, s) = r_and_s[..signature_len as usize].split_at(signature_len as usize / 2);
let der = BigNum::from_slice(r)
.and_then(|r| EcdsaSig::from_private_components(r, BigNum::from_slice(s)?))
.and_then(|signature| signature.to_der());
der.map_err(|_| Error::RemoteKeyError)
}
}
/// `None` if the TPM holds no key by that name.
/// `scope` is `NCRYPT_MACHINE_KEY_FLAG`, or empty for the current user's keys.
fn open_key(name: &str, scope: NCRYPT_FLAGS) -> WinResult<Option<CaKey>> {
let provider_handle = open_tpm_provider()?;
let mut key_handle = NCRYPT_KEY_HANDLE::default();
let opened = unsafe {
NCryptOpenKey(
*provider_handle,
&mut key_handle,
&HSTRING::from(name),
CERT_KEY_SPEC::default(), // legacy, unused by the TPM provider
scope | NCRYPT_SILENT_FLAG,
)
};
match opened {
Err(error) if error.code() == NTE_BAD_KEYSET => Ok(None),
Err(error) => Err(error),
Ok(()) => CaKey::from_handles(provider_handle, unsafe { Owned::new(key_handle) }).map(Some),
}
}
/// Generates the key inside the TPM, which never lets it out.
fn create_key(name: &str, scope: NCRYPT_FLAGS) -> WinResult<CaKey> {
let provider_handle = open_tpm_provider()?;
let mut key_handle = NCRYPT_KEY_HANDLE::default();
unsafe {
NCryptCreatePersistedKey(
*provider_handle,
&mut key_handle,
NCRYPT_ECDSA_P256_ALGORITHM,
&HSTRING::from(name),
CERT_KEY_SPEC::default(), // legacy, unused by the TPM provider
scope,
)?
};
let key_handle = unsafe { Owned::new(key_handle) };
// Until finalized the key is only a handle; this generates and stores it.
unsafe { NCryptFinalizeKey(*key_handle, NCRYPT_SILENT_FLAG)? };
CaKey::from_handles(provider_handle, key_handle)
}
/// The Microsoft Platform Crypto Provider, which keeps its keys in the TPM.
fn open_tpm_provider() -> WinResult<Owned<NCRYPT_PROV_HANDLE>> {
let mut provider_handle = NCRYPT_PROV_HANDLE::default();
unsafe { NCryptOpenStorageProvider(&mut provider_handle, MS_PLATFORM_CRYPTO_PROVIDER, 0)? };
Ok(unsafe { Owned::new(provider_handle) })
}
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//! The notification-area icon, started at sign-in as the menu bar app is on macOS.
use super::pipe::PIPE;
use super::*;
use muda::{IsMenuItem, Menu, MenuEvent, MenuItem, PredefinedMenuItem, Submenu};
use serde::Deserialize;
use std::io::{BufRead, BufReader, Cursor, Write};
use std::os::windows::io::AsRawHandle;
use std::sync::mpsc::{channel, Receiver, Sender};
use std::time::Duration;
use tray_icon::{Icon, MouseButtonState, TrayIcon, TrayIconBuilder, TrayIconEvent};
use windows::core::{w, HRESULT, PCWSTR};
use windows::Win32::Foundation::*;
use windows::Win32::System::LibraryLoader::GetModuleHandleW;
use windows::Win32::System::Pipes::GetNamedPipeServerProcessId;
use windows::Win32::System::Threading::*;
use windows::Win32::UI::Controls::*;
use windows::Win32::UI::Shell::*;
use windows::Win32::UI::WindowsAndMessaging::*;
use windows_registry::CURRENT_USER;
use windows_service::service::{Service, ServiceAccess, ServiceState, ServiceStatus};
use windows_service::service_manager::{ServiceManager, ServiceManagerAccess};
const MENU_PAUSE: &str = "pause";
const MENU_RESTART: &str = "restart";
const MENU_LOG: &str = "log";
const MENU_QUIT: &str = "quit";
/// Also the service's requests, and `allow` the elevated `firewall-tray` command.
const ALLOW: &str = "allow";
const ALLOW_ONCE: &str = "allow-once";
const LOGO: &[u8] = include_bytes!("tray.png");
/// Where blocked packages are listed, below Open logs.
const BLOCKED_AT: usize = 5;
const BLOCKED_KEPT: usize = 10;
/// Runs until Quit, once per session.
pub fn run() -> Result<(), BoxError> {
let args: Vec<String> = std::env::args().skip(1).collect();
if let [verb, id, label @ ..] = &args[..] {
if verb == ALLOW {
// Run by `run_elevated`, so the service can tell an admin asked.
let trusted = ask_service(&format!("{ALLOW} {id}"))
.and_then(|reply| answered(&format!("Trusted {}", label.join(" ")), &reply));
if let Err(error) = trusted {
show_error(error);
std::process::exit(1);
}
return Ok(());
}
}
// Held until we exit.
let _mutex = unsafe { CreateMutexW(None, false, w!(r"Local\StrixFirewallTray"))? };
if unsafe { GetLastError() } == ERROR_ALREADY_EXISTS {
return Ok(());
}
let status = MenuItem::new("", false, None);
let pause = MenuItem::with_id(MENU_PAUSE, "", false, None);
let blocked_separator = PredefinedMenuItem::separator();
let menu = Menu::with_items(&[
&status,
&PredefinedMenuItem::separator(),
&pause,
&MenuItem::with_id(MENU_RESTART, "Restart", true, None),
&MenuItem::with_id(MENU_LOG, "Open logs", true, None),
&PredefinedMenuItem::separator(),
&MenuItem::with_id(MENU_QUIT, "Quit", true, None),
])?;
let (logo, logo_size) = logo_mask()?;
let icon = TrayIconBuilder::new()
.with_menu(Box::new(menu.clone()))
.build()?;
let window = HWND(icon.window_handle());
let mut tray = Tray {
icon,
logo,
logo_size,
drawn: None,
status,
pause,
state: None,
menu,
blocked_separator,
blocked: Vec::new(),
allowed: channel(),
};
tray.update();
// The service holds a new package's download only while it is asked this often.
unsafe { SetTimer(None, 0, 500, None) };
let mut message = MSG::default();
while unsafe { GetMessageW(&mut message, None, 0, 0) }.0 > 0 {
unsafe { DispatchMessageW(&message) };
// WM_CLOSE, as the MSI sends, destroys the icon's window.
if !unsafe { IsWindow(Some(window)) }.as_bool() {
break;
}
// Ours, not the icon window's own hover timer.
if message.message == WM_TIMER && message.hwnd.is_invalid() {
tray.update();
tray.collect_blocks();
}
while let Ok(event) = TrayIconEvent::receiver().try_recv() {
// The menu opens on release, so this keeps it current.
if let TrayIconEvent::Click {
button_state: MouseButtonState::Down,
..
} = event
{
tray.update();
}
}
while let Ok(event) = MenuEvent::receiver().try_recv() {
if event.id == MENU_QUIT {
return Ok(());
}
tray.on_menu(event.id.as_ref());
}
}
Ok(())
}
struct Tray {
icon: TrayIcon,
/// The logo's alpha channel; it is square.
logo: Vec<u8>,
logo_size: u32,
/// Whether the taskbar was light and the service screening when the icon was last set.
drawn: Option<(bool, bool)>,
status: MenuItem,
pause: MenuItem,
/// As the menu last showed it.
state: Option<ServiceState>,
menu: Menu,
blocked_separator: PredefinedMenuItem,
/// The most recent, as the menu lists them.
blocked: Vec<BlockedPackage>,
/// Allowed from another thread, so no longer listed.
allowed: (Sender<BlockedPackage>, Receiver<BlockedPackage>),
}
#[derive(Clone, PartialEq, Deserialize)]
struct BlockedPackage {
id: u64,
eco: String,
name: String,
version: Option<String>,
filter: String,
reason: String,
}
impl BlockedPackage {
fn label(&self) -> String {
match &self.version {
Some(version) => format!("{} {version} ({})", self.name, self.eco),
None => format!("{} ({})", self.name, self.eco),
}
}
/// The denylist and OSV only flag packages known to be malicious; the age check only holds
/// back new ones.
fn malicious(&self) -> bool {
self.filter != "age"
}
/// Malware is never allowed, and a new package only by version.
fn trustable(&self) -> bool {
!self.malicious() && self.version.is_some()
}
}
impl Tray {
fn update(&mut self) {
self.state = service_status().map(|status| status.current_state);
let screening = self.state == Some(ServiceState::Running);
let light = light_taskbar();
if self.drawn != Some((light, screening)) {
let rgba = logo_rgba(&self.logo, light, screening);
if let Ok(icon) = Icon::from_rgba(rgba, self.logo_size, self.logo_size) {
let _ = self.icon.set_icon(Some(icon));
}
self.drawn = Some((light, screening));
}
let text = status_text(self.state);
let tip = format!("Strix Firewall: {text}");
let _ = self.icon.set_tooltip(Some(tip));
self.status.set_text(text);
let pause = if screening { "Pause" } else { "Resume" };
self.pause.set_text(pause);
self.pause.set_enabled(self.state.is_some());
}
/// The service hands each block over once, so whichever tray asks first shows it.
fn collect_blocks(&mut self) {
let allowed: Vec<_> = self.allowed.1.try_iter().collect();
if !allowed.is_empty() {
self.blocked.retain(|blocked| !allowed.contains(blocked));
self.list_blocked();
}
if self.state != Some(ServiceState::Running) {
return;
}
let Ok(reply) = ask_service("blocks") else {
return;
};
let Ok(packages) = serde_json::from_str::<Vec<BlockedPackage>>(&reply) else {
return;
};
let mut new = Vec::new();
for package in packages {
if !self.blocked.contains(&package) {
self.blocked.push(package.clone());
new.push(package);
}
}
if new.is_empty() {
return;
}
let excess = self.blocked.len().saturating_sub(BLOCKED_KEPT);
self.blocked.drain(..excess);
self.list_blocked();
// Off the UI thread, so the menu keeps working while they are open.
let allowed = self.allowed.0.clone();
std::thread::spawn(move || {
for package in new {
if let Some(trust) = alert(&package) {
allow(package, trust, &allowed);
}
}
});
}
fn list_blocked(&self) {
while self.menu.items().len() > BLOCKED_AT + 2 {
self.menu.remove_at(BLOCKED_AT);
}
let _ = self.menu.insert(&self.blocked_separator, BLOCKED_AT);
for (i, package) in self.blocked.iter().enumerate() {
let verb = if package.malicious() {
"Blocked"
} else {
"Held back"
};
let reason = if package.malicious() {
format!("Malicious: {}", package.reason)
} else {
package.reason.clone()
};
let reason = MenuItem::new(reason, false, None);
let trustable = package.trustable();
let once = MenuItem::with_id(format!("{ALLOW_ONCE}:{i}"), "Allow Once", trustable, None);
let always = MenuItem::with_id(format!("{ALLOW}:{i}"), "Trust this version", trustable, None);
let items: &[&dyn IsMenuItem] = if package.malicious() {
&[&reason]
} else {
&[&reason, &once, &always]
};
let label = format!("{verb} {}", package.label());
if let Ok(item) = Submenu::with_items(label, true, items) {
let _ = self.menu.insert(&item, BLOCKED_AT + 1 + i);
}
}
}
fn on_menu(&self, id: &str) {
if let Some((verb @ (ALLOW | ALLOW_ONCE), i)) = id.split_once(':') {
let trust = verb == ALLOW;
let package = i.parse().ok().and_then(|i: usize| self.blocked.get(i));
if let Some(package) = package.cloned() {
let allowed = self.allowed.0.clone();
std::thread::spawn(move || allow(package, trust, &allowed));
}
return;
}
let state = self.state;
let screening = state == Some(ServiceState::Running);
let action: fn() -> Result<(), BoxError> = match id {
MENU_PAUSE if screening => || Ok(open_service()?.pause().map(drop)?),
MENU_PAUSE if state == Some(ServiceState::Paused) => {
|| Ok(open_service()?.resume().map(drop)?)
}
MENU_PAUSE => || Ok(open_service()?.start::<&str>(&[])?),
MENU_RESTART => {
// Off the UI thread, since stopping takes a while.
std::thread::spawn(|| restart().unwrap_or_else(show_error));
return;
}
MENU_LOG => {
let log = HSTRING::from(data_dir().as_path());
let none = PCWSTR::null();
unsafe { ShellExecuteW(None, w!("open"), &log, none, none, SW_SHOWNORMAL) };
return;
}
_ => return,
};
action().unwrap_or_else(show_error);
}
}
const ALLOW_ONCE_BUTTON: i32 = 100;
const TRUST_BUTTON: i32 = 101;
/// `firewall.rc`'s icon, embedded by `build.rs`.
const STRIX_ICON: PCWSTR = PCWSTR(1 as _);
/// `Some(true)` if the user chose to trust it, `Some(false)` to allow it once.
/// A task dialog, as a message box can't have both buttons.
fn alert(package: &BlockedPackage) -> Option<bool> {
let text = format!("{} {}.", package.label(), package.reason);
let (title, text, icon) = if package.malicious() {
let title = format!("Blocked malware: {}", package.label());
let text = text
+ "\n\nIt was not installed. Don't install it from another source. If you didn't expect this "
+ "package, a dependency may be compromised; tell your security team.";
(title, text, TD_ERROR_ICON)
} else {
("Held back a new package".to_owned(), text, STRIX_ICON)
};
let button = |id, text| TASKDIALOG_BUTTON { nButtonID: id, pszButtonText: text };
let allow = [button(ALLOW_ONCE_BUTTON, w!("Allow Once")), button(TRUST_BUTTON, w!("Trust this version"))];
let buttons: &[_] = if package.trustable() { &allow } else { &[] };
let (title, text) = (HSTRING::from(title), HSTRING::from(text));
let dialog = TASKDIALOGCONFIG {
cbSize: size_of::<TASKDIALOGCONFIG>() as u32,
// Where `STRIX_ICON` is loaded from; the `TD_` icons are Windows'.
hInstance: unsafe { GetModuleHandleW(None) }.ok()?.into(),
dwCommonButtons: TDCBF_CLOSE_BUTTON,
pszWindowTitle: w!("Strix Firewall"),
Anonymous1: TASKDIALOGCONFIG_0 { pszMainIcon: icon },
pszMainInstruction: PCWSTR(title.as_ptr()),
pszContent: PCWSTR(text.as_ptr()),
cButtons: buttons.len() as u32,
pButtons: buttons.as_ptr(),
pfCallback: Some(on_dialog),
..Default::default()
};
let mut chosen = 0;
unsafe { TaskDialogIndirect(&dialog, Some(&raw mut chosen), None, None) }.ok()?;
match chosen {
ALLOW_ONCE_BUTTON => Some(false),
TRUST_BUTTON => Some(true),
_ => None,
}
}
/// Asks for the foreground, as `MB_SETFOREGROUND` did; Windows may still leave it behind.
unsafe extern "system" fn on_dialog(
window: HWND,
event: TASKDIALOG_NOTIFICATIONS,
_: WPARAM,
_: LPARAM,
_: isize,
) -> HRESULT {
if event == TDN_CREATED {
let _ = unsafe { SetForegroundWindow(window) };
}
S_OK
}
/// Trusting writes the config for every user, so it goes through a UAC prompt.
/// The elevated process shows its own errors and late replies.
fn allow(package: BlockedPackage, trust: bool, allowed: &Sender<BlockedPackage>) {
let allowed_it = if trust {
run_elevated(&[ALLOW, &package.id.to_string(), &package.label()])
.map(|code| code == Some(0))
} else {
let title = format!("Allowed {} for the next minute", package.label());
ask_service(&format!("{ALLOW_ONCE} {}", package.id))
.and_then(|reply| answered(&title, &reply))
.map(|()| true)
};
match allowed_it {
Ok(true) => {
let _ = allowed.send(package);
}
Ok(false) => {}
Err(error) => show_error(error),
}
}
/// Tells the user, under `title`, when the install had already stopped waiting.
fn answered(title: &str, reply: &str) -> Result<(), BoxError> {
match reply {
"ok" => Ok(()),
"late" => {
let text = "The install had already stopped waiting for it. Run it again to finish.";
let (title, text) = (HSTRING::from(title), HSTRING::from(text));
unsafe { MessageBoxW(None, &text, &title, MB_ICONINFORMATION | MB_SETFOREGROUND) };
Ok(())
}
other => Err(other.into()),
}
}
/// This program as an admin, waiting for its exit code; `None` if the user said no.
fn run_elevated(args: &[&str]) -> Result<Option<u32>, BoxError> {
let exe = HSTRING::from(std::env::current_exe()?.as_path());
let parameters = HSTRING::from(args.join(" "));
let mut info = SHELLEXECUTEINFOW {
cbSize: size_of::<SHELLEXECUTEINFOW>() as u32,
fMask: SEE_MASK_NOCLOSEPROCESS,
lpVerb: w!("runas"),
lpFile: PCWSTR(exe.as_ptr()),
lpParameters: PCWSTR(parameters.as_ptr()),
nShow: SW_HIDE.0,
..Default::default()
};
if let Err(error) = unsafe { ShellExecuteExW(&mut info) } {
if error.code() == ERROR_CANCELLED.to_hresult() {
return Ok(None);
}
return Err(error.into());
}
let process = unsafe { Owned::new(info.hProcess) };
unsafe { WaitForSingleObject(*process, INFINITE) };
let mut code = 1;
unsafe { GetExitCodeProcess(*process, &mut code)? };
Ok(Some(code))
}
/// One request per connection, as the service answers.
fn ask_service(request: &str) -> Result<String, BoxError> {
let mut pipe = std::fs::OpenOptions::new()
.read(true)
.write(true)
.open(PIPE)?;
// Any program can create the pipe if it gets there before the service.
let mut server = 0;
unsafe { GetNamedPipeServerProcessId(HANDLE(pipe.as_raw_handle()), &mut server)? };
if service_status().and_then(|status| status.process_id) != Some(server) {
return Err("Another program is posing as the firewall service.".into());
}
pipe.write_all(format!("{request}\n").as_bytes())?;
let mut reply = String::new();
BufReader::new(pipe).read_line(&mut reply)?;
Ok(reply.trim_end().to_owned())
}
fn show_error(error: BoxError) {
let text = match error.source() {
Some(source) => format!("{error}: {source}"),
None => error.to_string(),
};
let text = HSTRING::from(text);
unsafe { MessageBoxW(None, &text, w!("Strix Firewall"), MB_ICONERROR) };
}
/// `None` when the service is not installed.
fn service_status() -> Option<ServiceStatus> {
let manager =
ServiceManager::local_computer(None::<&str>, ServiceManagerAccess::CONNECT).ok()?;
let service = manager
.open_service(SERVICE_NAME, ServiceAccess::QUERY_STATUS)
.ok()?;
service.query_status().ok()
}
fn light_taskbar() -> bool {
let personalize = r"Software\Microsoft\Windows\CurrentVersion\Themes\Personalize";
let Ok(key) = CURRENT_USER.open(personalize) else {
return false;
};
key.get_u32("SystemUsesLightTheme")
.is_ok_and(|light| light == 1)
}
fn status_text(state: Option<ServiceState>) -> &'static str {
match state {
Some(ServiceState::Running) => "Screening downloads",
Some(ServiceState::Paused) => "Paused",
_ => "Not running",
}
}
fn open_service() -> Result<Service, BoxError> {
let manager = ServiceManager::local_computer(None::<&str>, ServiceManagerAccess::CONNECT)?;
let access = ServiceAccess::QUERY_STATUS
| ServiceAccess::START
| ServiceAccess::STOP
| ServiceAccess::PAUSE_CONTINUE;
Ok(manager.open_service(SERVICE_NAME, access)?)
}
/// Starting again re-reads the config.
fn restart() -> Result<(), BoxError> {
let service = open_service()?;
if service.query_status()?.current_state != ServiceState::Stopped {
service.stop()?;
}
for _ in 0..60 {
if service.query_status()?.current_state == ServiceState::Stopped {
return Ok(service.start::<&str>(&[])?);
}
std::thread::sleep(Duration::from_millis(500));
}
Err("The service did not stop.".into())
}
/// The alpha channel of the RGBA logo, and its width.
fn logo_mask() -> Result<(Vec<u8>, u32), BoxError> {
let mut reader = png::Decoder::new(Cursor::new(LOGO)).read_info()?;
let mut rgba = vec![0; reader.output_buffer_size().ok_or("logo too large")?];
let info = reader.next_frame(&mut rgba)?;
let mut alpha = Vec::with_capacity(rgba.len() / 4);
for pixel in rgba.chunks(4) {
alpha.push(pixel[3]);
}
Ok((alpha, info.width))
}
/// White on a dark taskbar and black on a light one, as macOS draws a template image; dimmed
/// when not screening.
fn logo_rgba(mask: &[u8], light: bool, screening: bool) -> Vec<u8> {
let shade = if light { 0 } else { 255 };
let mut rgba = Vec::with_capacity(mask.len() * 4);
for &alpha in mask {
let alpha = if screening { alpha } else { alpha / 2 };
rgba.extend([shade, shade, shade, alpha]);
}
rgba
}
-41
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@@ -1,41 +0,0 @@
use super::ca::remove_our_cas_except;
use super::tpm::CaKey;
use super::*;
use std::io::ErrorKind;
use std::path::Path;
use tracing::info;
/// Run by the MSI after it deletes the service, which would restore the hosts entries. Does
/// nothing for what is already gone.
pub fn uninstall() -> Result<(), BoxError> {
write_hosts_entries(&[])?;
remove_our_cas_except(None)?;
none_if_missing(LOCAL_MACHINE.remove_tree(REGISTRY_KEY))?;
CaKey::delete_machine_key()?;
let entries = match std::fs::read_dir(data_dir()) {
Err(error) if error.kind() == ErrorKind::NotFound => Vec::new(),
entries => entries?.collect::<Result<Vec<_>, _>>()?,
};
for path in entries.into_iter().map(|entry| entry.path()) {
// The admin's config stays for a reinstall, as on macOS.
if path != config_file() {
remove_path(&path)?;
}
}
// Fails while the config is in it.
let _ = std::fs::remove_dir(data_dir());
info!("removed the CA, its key and the data folder");
Ok(())
}
/// A file or a folder, if it is there.
fn remove_path(path: &Path) -> std::io::Result<()> {
let removed = match path.is_dir() {
true => std::fs::remove_dir_all(path),
false => std::fs::remove_file(path),
};
match removed {
Err(error) if error.kind() == ErrorKind::NotFound => Ok(()),
removed => removed,
}
}
+73
View File
@@ -0,0 +1,73 @@
use crate::config::PlatformConfig;
use crate::policies::Package;
use crate::FirewallConfig;
use rama::http::client::EasyHttpWebClient;
use rama::http::header::{AUTHORIZATION, CONTENT_TYPE};
use rama::http::service::client::HttpClientExt;
use serde_json::{json, Value};
use std::sync::{LazyLock, Mutex};
use std::time::Duration;
use time::format_description::well_known::Rfc3339;
use time::OffsetDateTime;
use tracing::{debug, warn};
const TIMEOUT: Duration = Duration::from_secs(10);
/// The most events the platform takes in one request.
const BATCH: usize = 500;
/// On when a readable config names a Strix API key.
static PLATFORM: LazyLock<Option<Platform>> = LazyLock::new(|| {
let config = FirewallConfig::load().ok()?.platform?;
Some(Platform { config, events: Mutex::default() })
});
struct Platform {
config: PlatformConfig,
events: Mutex<Vec<Value>>,
}
pub fn on() -> bool {
PLATFORM.is_some()
}
pub fn record(eco: &str, pkg: &Package, reason: Option<&str>) {
let Some(platform) = &*PLATFORM else { return };
let event = json!({
"ecosystem": eco,
"name": pkg.name,
"version": pkg.version,
"blocked": reason.is_some(),
"reason": reason,
"occurred_at": OffsetDateTime::now_utc().format(&Rfc3339).ok(),
});
platform.events.lock().expect("platform lock").push(event);
}
/// Events in a batch the platform did not take are dropped, not retried.
pub async fn send() {
let Some(platform) = &*PLATFORM else { return };
let events = std::mem::take(&mut *platform.events.lock().expect("platform lock"));
let url = format!("{}/api/v1/firewall/events", platform.config.url);
let client = EasyHttpWebClient::default();
for batch in events.chunks(BATCH) {
let body = json!({
"device": whoami::hostname().ok(),
"user": whoami::username().ok(),
"os": std::env::consts::OS,
"firewall_version": env!("CARGO_PKG_VERSION"),
"events": batch,
});
let request = client
.post(&url)
.header(CONTENT_TYPE, "application/json")
.header(AUTHORIZATION, format!("Bearer {}", platform.config.api_key));
match tokio::time::timeout(TIMEOUT, request.body(body.to_string()).send()).await {
Ok(Ok(response)) if response.status().is_success() => {
debug!(events = batch.len(), "installs reported")
}
Ok(Ok(response)) => warn!(status = %response.status(), %url, "platform refused installs"),
Ok(Err(error)) => warn!(%error, %url, "could not report installs"),
Err(_) => warn!(%url, "reporting installs timed out"),
}
}
}
+1 -1
View File
@@ -143,7 +143,7 @@ pub fn describe(advisories: &[&Advisory]) -> String {
/// A failed fetch leaves the last good list in place; a list that never loaded is retried every tick.
async fn watch(source: DenylistSource, lists: Arc<Lists>) {
let period = Duration::from_secs(source.poll_secs.get());
let period = Duration::from_secs(source.poll_secs);
let mut seen = revision(&source, None).await;
loop {
tokio::time::sleep(period).await;
+12 -18
View File
@@ -3,7 +3,6 @@ pub mod denylist;
pub mod osv;
use super::registries::{Package, Registry};
use crate::config::AllowedPackage;
use crate::Firewall;
use std::future::Future;
use std::pin::Pin;
@@ -26,19 +25,16 @@ pub trait Filter: Send + Sync {
}
/// Asks every filter. A `Deny` wins; failing that, the first filter that could not tell.
/// An allowed package skips only the age check, so malware is never let through.
pub async fn consult(
firewall: &Firewall,
registry: &'static Registry,
pkg: &Package,
) -> Option<(&'static str, Verdict)> {
let lifted = allowed(firewall, registry, pkg)
|| firewall.age_check_lifted(registry.eco, |entry| matches(registry, pkg, entry));
if allowed(firewall, registry, pkg) {
return None;
}
let mut unsure = None;
for filter in firewall.filters() {
if lifted && filter.name() == "age" {
continue;
}
match filter.check(registry, pkg).await {
Verdict::Allow => continue,
Verdict::Deny(reason) => return Some((filter.name(), Verdict::Deny(reason))),
@@ -53,15 +49,13 @@ fn allowed(firewall: &Firewall, registry: &Registry, pkg: &Package) -> bool {
let Some(entries) = firewall.config.allow.get(registry.eco) else {
return false;
};
entries.iter().any(|entry| matches(registry, pkg, entry))
}
fn matches(registry: &Registry, pkg: &Package, entry: &AllowedPackage) -> bool {
let name_matches = match registry.normalize {
Some(normalize) => normalize(&entry.name) == pkg.name,
None => entry.name == pkg.name,
};
// Go writes a leading v that the parsed version drops, and PEP 440 ignores one.
let version = entry.version.as_deref().map(|v| v.strip_prefix('v').unwrap_or(v));
name_matches && (version.is_none() || version == pkg.version.as_deref())
entries.iter().any(|entry| {
let name_matches = match registry.normalize {
Some(normalize) => normalize(&entry.name) == pkg.name,
None => entry.name == pkg.name,
};
// Go writes a leading v that the parsed version drops, and PEP 440 ignores one.
let version = entry.version.as_deref().map(|v| v.strip_prefix('v').unwrap_or(v));
name_matches && (version.is_none() || version == pkg.version.as_deref())
})
}
+1 -5
View File
@@ -69,11 +69,7 @@ pub async fn screen(url: &str, firewall: &Firewall) -> Option<String> {
};
info!(eco = registry.eco, pkg = %pkg.label(), %url, "screening");
match consult(firewall, registry, &pkg).await {
Some((filter, Verdict::Deny(reason))) => {
if crate::blocks::block(registry.eco, &pkg, filter, &reason).await {
info!(eco = registry.eco, pkg = %pkg.label(), "allowed while held");
return None;
}
Some((_, Verdict::Deny(reason))) => {
Some(format!("{} {reason}", pkg.label()))
}
Some((filter, Verdict::Unknown(e))) if !firewall.config.fail_open => {
+2 -7
View File
@@ -36,7 +36,7 @@ pub struct Pattern {
}
/// Requests to the local server match on `prefix`; intercepted URLs match on `upstream`.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub struct Registry {
pub prefix: &'static str,
pub eco: &'static str,
@@ -52,7 +52,7 @@ pub struct Registry {
}
/// A URL to fetch and a JSON pointer to the timestamp in its reply.
#[derive(Debug, Clone)]
#[derive(Debug)]
pub struct Published {
pub url: &'static str,
pub pointer: &'static str,
@@ -63,11 +63,6 @@ impl Registry {
pub fn host(&self) -> &'static str {
host_of(self.upstream)
}
/// What the config file calls it.
pub fn name(&self) -> &'static str {
self.prefix.trim_matches('/')
}
}
/// The host of an https:// URL, with the path dropped.
+1 -1
View File
@@ -15,7 +15,7 @@ use std::sync::Arc;
use tracing::{info, info_span, warn, Instrument};
pub fn serve(config: FirewallConfig) -> std::io::Result<()> {
let bound = std::net::TcpListener::bind(("127.0.0.1", config.port.get()))?;
let bound = std::net::TcpListener::bind(("127.0.0.1", config.port))?;
bound.set_nonblocking(true)?;
crate::runtime()?.block_on(async move {
let firewall = Arc::new(Firewall::new(config));
+12 -4
View File
@@ -1,3 +1,4 @@
use crate::platform;
use crate::policies::Package;
use crate::{Firewall, FirewallConfig};
use rama::http::client::EasyHttpWebClient;
@@ -30,7 +31,7 @@ static TELEMETRY: LazyLock<Option<Telemetry>> = LazyLock::new(|| {
})
});
/// How the firewall is running: "extension", "service", "wrapper" or "proxy".
/// How the firewall is running: "extension", "wrapper" or "proxy".
static MODE: OnceLock<&'static str> = OnceLock::new();
struct Telemetry {
@@ -40,7 +41,7 @@ struct Telemetry {
}
pub fn screened(firewall: &Firewall, url: &str, reason: Option<&str>) {
if TELEMETRY.is_none() {
if !on() {
return;
}
let Some((registry, rest)) = firewall.match_on(url, |r| r.upstream) else {
@@ -52,6 +53,7 @@ pub fn screened(firewall: &Firewall, url: &str, reason: Option<&str>) {
}
pub fn screened_package(eco: &str, pkg: &Package, reason: Option<&str>) {
platform::record(eco, pkg, reason);
let mut properties = json!({ "eco": eco, "blocked": reason.is_some() });
if let Some(reason) = reason {
properties["package"] = pkg.label().into();
@@ -69,7 +71,7 @@ pub fn error(kind: &'static str) {
}
pub fn heartbeat() {
if TELEMETRY.is_none() {
if !on() {
return;
}
tokio::spawn(async {
@@ -81,7 +83,7 @@ pub fn heartbeat() {
}
pub fn flush() {
if TELEMETRY.is_none() {
if !on() {
return;
}
match Runtime::try_new() {
@@ -90,6 +92,11 @@ pub fn flush() {
}
}
/// PostHog, or the Strix platform when the config names one.
fn on() -> bool {
TELEMETRY.is_some() || platform::on()
}
fn record(event: &str, mut properties: Value) {
let Some(telemetry) = &*TELEMETRY else { return };
properties["distinct_id"] = telemetry.session.clone().into();
@@ -103,6 +110,7 @@ fn record(event: &str, mut properties: Value) {
}
pub async fn send() {
platform::send().await;
let Some(telemetry) = &*TELEMETRY else { return };
let batch = std::mem::take(&mut *telemetry.events.lock().expect("telemetry lock"));
if batch.is_empty() {
-27
View File
@@ -1,27 +0,0 @@
use firewall::blocks::{answer, block};
use firewall::policies::Package;
use firewall::Firewall;
use std::path::Path;
use std::time::Duration;
#[tokio::test]
async fn allowing_once_releases_the_held_download() {
let firewall = Firewall::default();
let config = Path::new("/nonexistent/config.json");
let pkg = Package { name: "left-pad".into(), version: Some("1.3.0".into()) };
assert!(!block("npm", &pkg, "age", "is new").await, "held while nothing was asking");
answer(&firewall, config, "blocks");
let held = tokio::spawn(async move { block("npm", &pkg, "age", "is new").await });
let id = loop {
let blocks: serde_json::Value = serde_json::from_str(&answer(&firewall, config, "blocks")).unwrap();
if let Some(id) = blocks[0]["id"].as_u64() {
break id;
}
tokio::time::sleep(Duration::from_millis(10)).await;
};
assert_eq!(answer(&firewall, config, &format!("allow-once {id}")), "ok");
assert!(held.await.unwrap(), "the waiting download goes through");
assert!(firewall.age_check_lifted("npm", |p| p.name == "left-pad"), "and the rest of the install");
assert!(!block("npm", &Package { name: "evil".into(), version: None }, "denylist", "is malware").await);
}
+7 -70
View File
@@ -1,4 +1,4 @@
use firewall::config::{path, AllowedPackage};
use firewall::config::path;
use firewall::policies::filters::consult;
use firewall::policies::{screen, Package};
use firewall::{Firewall, FirewallConfig};
@@ -7,7 +7,7 @@ use firewall::{Firewall, FirewallConfig};
fn a_file_only_has_to_set_what_it_changes() {
let config: FirewallConfig = serde_json::from_str(r#"{"fail_open": false}"#).expect("parses");
assert!(!config.fail_open);
assert_eq!(config.port.get(), firewall::DEFAULT_PORT);
assert_eq!(config.port, firewall::DEFAULT_PORT);
}
#[test]
@@ -15,28 +15,6 @@ fn a_misspelled_setting_is_an_error() {
assert!(serde_json::from_str::<FirewallConfig>(r#"{"fail-open": false}"#).is_err());
}
#[test]
fn nonsense_values_are_errors() {
let file = std::env::temp_dir().join(format!("firewall-nonsense-{}.json", std::process::id()));
for bad in [
r#"{"allow": {"nmp": [{"name": "left-pad"}]}}"#,
r#"{"denylist": {"poll_secs": 0}}"#,
r#"{"denylist": {"base": "raw.githubusercontent.com/usestrix"}}"#,
r#"{"denylist": {"revision": "https://"}}"#,
r#"{"port": 0}"#,
r#"{"min_age_hours": 18446744073709551615}"#,
r#"{"registries": {"npm": ["http://npm.example.com/"]}}"#,
r#"{"registries": {"npm": ["https://npm.example.com"]}}"#,
r#"{"registries": {"npm": ["https://npm.example.com:8443/"]}}"#,
r#"{"registries": {"npm": ["https://[email protected]/"]}}"#,
r#"{"registries": {"npm": ["https://npm.example.com/?a=/"]}}"#,
] {
std::fs::write(&file, bad).expect("write");
assert!(FirewallConfig::load_from(std::slice::from_ref(&file)).is_err(), "{bad}");
}
std::fs::remove_file(&file).ok();
}
#[test]
fn the_config_lives_under_the_config_directory() {
let path = path().expect("a home directory");
@@ -61,29 +39,14 @@ fn a_later_file_wins_and_allow_lists_add_up() {
}
#[tokio::test]
async fn a_mirror_is_screened_like_the_registry_it_copies() {
let config = r#"{"registries": {"npm": ["https://npm.example.com/"]}}"#;
let firewall = Firewall::new(serde_json::from_str(config).expect("parses"));
assert!(firewall.hosts().contains(&"npm.example.com"));
let url = "https://npm.example.com/left-pad/-/left-pad-1.3.0.tgz";
let (registry, rest) = firewall.match_on(url, |r| r.upstream).expect("the mirror");
assert_eq!(firewall.resolve(registry, rest).pkg.map(|p| p.label()), Some("[email protected]".into()));
let unknown = std::env::temp_dir().join(format!("firewall-mirror-{}.json", std::process::id()));
std::fs::write(&unknown, r#"{"registries": {"nmp": ["https://npm.example.com/"]}}"#).expect("write");
let loaded = FirewallConfig::load_from(std::slice::from_ref(&unknown));
std::fs::remove_file(&unknown).ok();
assert!(loaded.is_err());
}
#[tokio::test]
async fn an_allowed_version_is_still_checked_for_malware() {
// The unreachable denylist shows that it still runs.
async fn an_allowed_version_skips_the_filters() {
// An unreachable denylist would otherwise leave the package unchecked.
let config = r#"{"allow": {"go": [{"name": "golang.org/x/net", "version": "v0.20.0"}]}, "denylist": {"base": "http://127.0.0.1:1"}}"#;
let firewall = Firewall::new(serde_json::from_str(config).expect("parses"));
let (registry, _) = firewall.match_on("/go/golang.org/x/net/@v/list", |r| r.prefix).expect("go");
let pkg = Package { name: "golang.org/x/net".into(), version: Some("0.20.0".into()) };
let verdict = consult(&firewall, registry, &pkg).await;
assert_eq!(verdict.map(|(filter, _)| filter), Some("denylist"));
let pkg = |version: &str| Package { name: "golang.org/x/net".into(), version: Some(version.into()) };
assert!(consult(&firewall, registry, &pkg("0.20.0")).await.is_none());
assert!(consult(&firewall, registry, &pkg("0.21.0")).await.is_some());
}
#[tokio::test]
@@ -94,29 +57,3 @@ async fn failing_closed_blocks_what_could_not_be_checked() {
let blocked = screen(url, &firewall).await.unwrap_or_default();
assert!(blocked.contains("could not be checked"), "{blocked:?}");
}
#[tokio::test]
async fn lifting_the_age_check_still_checks_for_malware() {
let config = r#"{"denylist": {"base": "http://127.0.0.1:1"}}"#;
let firewall = Firewall::new(serde_json::from_str(config).expect("parses"));
let (registry, _) = firewall.match_on("/go/golang.org/x/net/@v/list", |r| r.prefix).expect("go");
let pkg = Package { name: "golang.org/x/net".into(), version: Some("0.20.0".into()) };
firewall.lift_age_check("go", AllowedPackage { name: pkg.name.clone(), version: None }, None);
let (filter, _) = consult(&firewall, registry, &pkg).await.expect("the denylist still runs");
assert_eq!(filter, "denylist");
}
#[test]
fn allowing_keeps_the_rest_of_the_file() {
let path = std::env::temp_dir().join(format!("firewall-allow-{}.json", std::process::id()));
std::fs::write(&path, r#"{"fail_open": false}"#).expect("write");
for _ in 0..2 {
firewall::config::allow(&path, "npm", "left-pad", "1.3.0").expect("allow");
}
let text = std::fs::read_to_string(&path).expect("read");
std::fs::remove_file(&path).ok();
let config: FirewallConfig = serde_json::from_str(&text).expect("parses");
assert!(!config.fail_open);
assert_eq!(config.allow["npm"].len(), 1);
assert_eq!(config.allow["npm"][0].version.as_deref(), Some("1.3.0"));
}
+1 -22
View File
@@ -1,9 +1,7 @@
use firewall::aliasing::forward::downgrade;
use firewall::http::https_url;
use firewall::{aliasing, Firewall, FirewallConfig};
use firewall::Firewall;
use rama::http::{Body, Request};
use std::io::{Read, Write};
use std::net::{TcpListener, TcpStream};
fn request(target: &str, host: Option<&str>) -> Request {
let mut builder = Request::builder().method("GET").uri(target);
@@ -37,25 +35,6 @@ fn requests_always_go_out_over_tls() {
assert_eq!(https_url(&request("/six", None)), None);
}
#[test]
fn a_plain_http_upstream_is_not_upgraded() {
let upstream = TcpListener::bind("127.0.0.1:0").expect("bind");
let addr = upstream.local_addr().expect("address");
std::thread::spawn(move || {
let (mut stream, _) = upstream.accept().expect("accept");
let _ = stream.read(&mut [0; 4096]);
let _ = stream.write_all(b"HTTP/1.1 200 OK\r\nContent-Length: 2\r\n\r\nok");
});
let port = aliasing::spawn(0, FirewallConfig::default()).expect("spawn");
let mut proxy = TcpStream::connect(("127.0.0.1", port)).expect("connect");
let request = format!("GET http://{addr}/x HTTP/1.1\r\nHost: {addr}\r\nConnection: close\r\n\r\n");
proxy.write_all(request.as_bytes()).expect("write");
let mut response = String::new();
proxy.read_to_string(&mut response).expect("read");
assert!(response.starts_with("HTTP/1.1 200") && response.ends_with("ok"), "{response}");
}
#[tokio::test]
async fn downgrade_touches_known_hosts_in_text_only() {
let text = b"https://pypi.org/x https://example.com/y".to_vec();
-21
View File
@@ -1,21 +0,0 @@
#![cfg(windows)]
use firewall::mitm::CertificateAuthority;
use firewall::os::windows::CaKey;
use rcgen::PublicKeyData;
/// Skipped on machines without a TPM.
#[test]
fn key_signs_a_verifiable_ca() {
let key = match CaKey::create_test_key() {
Ok(key) => key,
Err(error) => return eprintln!("skipping, no TPM key: {error}"),
};
let ca = CertificateAuthority::generate(&["registry.npmjs.org"], &key);
let spki = key.subject_public_key_info();
key.delete_from_tpm().expect("delete the test key");
let ca = ca.expect("mint a ca");
let public = ca.crt.public_key().expect("ca public key");
assert!(ca.crt.verify(&public).expect("verify the ca"));
assert_eq!(public.public_key_to_der().unwrap(), spki);
}
-193
View File
@@ -1,193 +0,0 @@
<?xml version='1.0' encoding='windows-1252'?>
<!--
Copyright (C) 2017 Christopher R. Field.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<?if $(sys.BUILDARCH) = x64 or $(sys.BUILDARCH) = arm64 ?>
<?define PlatformProgramFilesFolder = "ProgramFiles64Folder" ?>
<?else ?>
<?define PlatformProgramFilesFolder = "ProgramFilesFolder" ?>
<?endif ?>
<Wix xmlns='http://schemas.microsoft.com/wix/2006/wi' xmlns:util='http://schemas.microsoft.com/wix/UtilExtension'>
<Product
Id='*'
Name='strix-firewall'
UpgradeCode='D944C2F6-BF55-4B21-A60E-1BBDB1A66293'
Manufacturer='Strix'
Language='1033'
Codepage='1252'
Version='$(var.Version)'>
<Package Id='*'
Keywords='Installer'
Description='Screens package downloads for known malware before they reach your machine'
Manufacturer='Strix'
InstallerVersion='500'
Languages='1033'
Compressed='yes'
InstallScope='perMachine'
SummaryCodepage='1252'
/>
<MajorUpgrade
Schedule='afterInstallInitialize'
DowngradeErrorMessage='A newer version of [ProductName] is already installed. Setup will now exit.'/>
<Media Id='1' Cabinet='media1.cab' EmbedCab='yes' DiskPrompt='CD-ROM #1'/>
<Property Id='DiskPrompt' Value='strix-firewall Installation'/>
<Directory Id='TARGETDIR' Name='SourceDir'>
<Directory Id='$(var.PlatformProgramFilesFolder)' Name='PFiles'>
<Directory Id='APPLICATIONFOLDER' Name='Strix Firewall'>
<Component Id='Path' Guid='033B1050-23D0-4F5A-A0D3-F4757B4B67E0' KeyPath='yes'>
<Environment
Id='PATH'
Name='PATH'
Value='[APPLICATIONFOLDER]'
Permanent='no'
Part='last'
Action='set'
System='yes'/>
</Component>
<Component Id='binary0' Guid='*'>
<File
Id='exe0'
Name='firewall.exe'
DiskId='1'
Source='$(var.CargoTargetBinDir)\firewall.exe'
KeyPath='yes'/>
</Component>
<Component Id='binary1' Guid='*'>
<File
Id='exe1'
Name='firewall-service.exe'
DiskId='1'
Source='$(var.CargoTargetBinDir)\firewall-service.exe'
KeyPath='yes'/>
<ServiceInstall
Name='StrixFirewall'
DisplayName='Strix Firewall'
Description='Screens package downloads for known malware'
Type='ownProcess'
Start='auto'
ErrorControl='normal'
Vital='yes'>
<!-- The default, except that interactive users (IU) may also start (RP), stop (WP) and pause (DT) it, as the tray does. -->
<PermissionEx Sddl='D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWRPWPDTLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)'/>
</ServiceInstall>
<!-- Waits, so a service that cannot start fails the install. -->
<ServiceControl Id='StrixFirewall' Name='StrixFirewall' Start='install' Stop='both' Remove='uninstall' Wait='yes'/>
<!-- For clients that read no trust store. SSL_CERT_FILE would replace OpenSSL's bundle. -->
<Environment Id='NODE_EXTRA_CA_CERTS' Name='NODE_EXTRA_CA_CERTS' Value='[CommonAppDataFolder]Strix Firewall\ca.pem' Action='set' System='yes'/>
<Environment Id='UV_SYSTEM_CERTS' Name='UV_SYSTEM_CERTS' Value='1' Action='set' System='yes'/>
</Component>
<Component Id='binary2' Guid='*'>
<File
Id='exe2'
Name='firewall-tray.exe'
DiskId='1'
Source='$(var.CargoTargetBinDir)\firewall-tray.exe'
KeyPath='yes'/>
<RegistryValue
Root='HKLM'
Key='SOFTWARE\Microsoft\Windows\CurrentVersion\Run'
Name='Strix Firewall'
Type='string'
Value='"[#exe2]"'/>
</Component>
</Directory>
</Directory>
</Directory>
<Feature
Id='Binaries'
Title='Application'
Description='Installs the firewall and its service.'
Level='1'
ConfigurableDirectory='APPLICATIONFOLDER'
AllowAdvertise='no'
Display='expand'
Absent='disallow'>
<ComponentRef Id='binary0'/>
<ComponentRef Id='binary1'/>
<ComponentRef Id='binary2'/>
<Feature
Id='Environment'
Title='PATH Environment Variable'
Description='Add the install location of the [ProductName] executable to the PATH system environment variable. This allows the [ProductName] executable to be called from any location.'
Level='1'
Absent='allow'>
<ComponentRef Id='Path'/>
</Feature>
</Feature>
<!-- Removing the app must not leave the hosts file pointing at a service that is gone. -->
<CustomAction
Id='UninstallFirewall'
FileKey='exe1'
ExeCommand='uninstall'
Execute='deferred'
Impersonate='no'
Return='check'/>
<!--
Registry hosts lead nowhere while the service is down, so bring it back, also when it fails to
start. Through sc.exe, as MsiServiceConfigFailureActions cannot restart a service.
-->
<CustomAction
Id='SetFailureActions'
Directory='APPLICATIONFOLDER'
ExeCommand='"[System64Folder]sc.exe" failure StrixFirewall reset= 3600 actions= restart/5000/restart/5000/restart/5000'
Execute='deferred'
Impersonate='no'
Return='check'/>
<CustomAction
Id='SetFailureFlag'
Directory='APPLICATIONFOLDER'
ExeCommand='"[System64Folder]sc.exe" failureflag StrixFirewall 1'
Execute='deferred'
Impersonate='no'
Return='check'/>
<!-- From the exit dialog, which runs as the signed-in user rather than elevated. -->
<CustomAction
Id='StartTray'
Directory='APPLICATIONFOLDER'
ExeCommand='"[#exe2]"'
Return='asyncNoWait'/>
<!-- Before its file is replaced or removed. Trays WM_CLOSE does not reach, as in other sessions, are terminated. -->
<util:CloseApplication Id='CloseTray' Target='firewall-tray.exe' CloseMessage='yes' RebootPrompt='no' TerminateProcess='0'/>
<InstallExecuteSequence>
<!-- An upgrade removes the old version too, but should keep screening. -->
<Custom Action='UninstallFirewall' After='DeleteServices'>REMOVE~="ALL" AND NOT UPGRADINGPRODUCTCODE</Custom>
<Custom Action='SetFailureActions' After='InstallServices'>NOT REMOVE~="ALL"</Custom>
<Custom Action='SetFailureFlag' After='SetFailureActions'>NOT REMOVE~="ALL"</Custom>
<!-- The default, before InstallFiles, is after RemoveFiles, which would find the tray still running. -->
<Custom Action='WixCloseApplications' Before='RemoveFiles'/>
</InstallExecuteSequence>
<SetProperty Id='ARPINSTALLLOCATION' Value='[APPLICATIONFOLDER]' After='CostFinalize'/>
<Property Id='ARPHELPLINK' Value='https://github.com/usestrix/firewall'/>
<UI>
<UIRef Id='WixUI_FeatureTree'/>
<Publish Dialog='WelcomeDlg' Control='Next' Event='NewDialog' Value='CustomizeDlg' Order='99'>1</Publish>
<Publish Dialog='CustomizeDlg' Control='Back' Event='NewDialog' Value='WelcomeDlg' Order='99'>1</Publish>
<Publish Dialog='ExitDialog' Control='Finish' Event='DoAction' Value='StartTray' Order='1'>NOT Installed</Publish>
</UI>
</Product>
</Wix>
+1 -4
View File
@@ -4,10 +4,7 @@ members = ["cargo:core"]
[dist]
cargo-dist-version = "0.32.0"
ci = "github"
installers = ["shell", "powershell", "homebrew", "msi"]
# core/wix/main.wxs is edited to install the service.
allow-dirty = ["msi"]
features = ["machine-wide"]
installers = ["shell", "powershell", "homebrew"]
tap = "usestrix/homebrew-tap"
publish-jobs = ["homebrew", "./publish-crates"]
targets = ["aarch64-apple-darwin", "x86_64-apple-darwin", "aarch64-unknown-linux-gnu", "x86_64-unknown-linux-gnu", "x86_64-pc-windows-msvc"]
-93
View File
@@ -1,93 +0,0 @@
import AppKit
import Security
struct BlockedPackage: Codable, Hashable, Identifiable {
let id: UInt64
let eco: String
let name: String
let version: String?
let filter: String
let reason: String
var label: String { version.map { "\(name) \($0)" } ?? name }
/// The denylist and OSV only flag packages known to be malicious; the age check only holds back new ones.
var malicious: Bool { filter != "age" }
/// Malware is never allowed, and a new package only by version.
var trustable: Bool { !malicious && version != nil }
}
enum Allowance {
/// For a minute, so the rest of that install can fetch it too.
case once
case always
}
@MainActor
enum BlockAlert {
static func show(_ package: BlockedPackage) -> Allowance? {
let alert = NSAlert()
alert.addButton(withTitle: "OK")
if package.malicious {
alert.alertStyle = .critical
alert.messageText = "Blocked malware: \(package.label) (\(package.eco))"
setText(alert, "\(package.label) \(package.reason).\n\n"
+ "It was not installed. Don't install it from another source. "
+ "If you didn't expect this package, a dependency may be compromised; tell your security team.")
} else {
alert.messageText = "Held back a new package"
setText(alert, "\(package.label) (\(package.eco)) \(package.reason).")
if package.trustable {
alert.addButton(withTitle: "Allow Once")
alert.addButton(withTitle: "Trust this version")
}
}
NSApp.activate(ignoringOtherApps: true)
switch alert.runModal() {
case .alertSecondButtonReturn: return .once
case .alertThirdButtonReturn: return .always
default: return nil
}
}
static func late(_ package: BlockedPackage, _ allowance: Allowance) {
let alert = NSAlert()
alert.messageText = allowance == .once ? "Allowed \(package.label) for the next minute" : "Trusted \(package.label)"
alert.informativeText = "The install had already stopped waiting for it. Run it again to finish."
NSApp.activate(ignoringOtherApps: true)
alert.runModal()
}
/// An alert's own text is plain, so this text goes in a selectable field, where its links open on click.
private static func setText(_ alert: NSAlert, _ text: String) {
let linked = NSMutableAttributedString(string: text, attributes: [.font: NSFont.systemFont(ofSize: NSFont.smallSystemFontSize)])
let detector = try! NSDataDetector(types: NSTextCheckingResult.CheckingType.link.rawValue)
for match in detector.matches(in: text, range: NSRange(text.startIndex..., in: text)) {
if let url = match.url { linked.addAttribute(.link, value: url, range: match.range) }
}
let field = NSTextField(wrappingLabelWithString: "")
field.allowsEditingTextAttributes = true
field.isSelectable = true
field.attributedStringValue = linked
field.preferredMaxLayoutWidth = 300
field.frame.size = field.fittingSize
alert.accessoryView = field
}
}
enum AdminAuthorization {
/// The allowlist applies to every user of the Mac, so changing it takes an admin, as `sudo` would.
static func confirm() -> Bool {
var authorization: AuthorizationRef?
guard AuthorizationCreate(nil, nil, [], &authorization) == errAuthorizationSuccess,
let authorization else { return false }
defer { AuthorizationFree(authorization, []) }
return "system.preferences".withCString { name in
var item = AuthorizationItem(name: name, valueLength: 0, value: nil, flags: 0)
return withUnsafeMutablePointer(to: &item) { item in
var rights = AuthorizationRights(count: 1, items: item)
let flags: AuthorizationFlags = [.interactionAllowed, .extendRights]
return AuthorizationCopyRights(authorization, &rights, nil, flags, nil) == errAuthorizationSuccess
}
}
}
}
+3 -40
View File
@@ -29,13 +29,11 @@ enum FirewallError: Error, LocalizedError {
case extensionUnavailable
case screeningDidNotStart(NEVPNStatus)
case extensionStopped(String)
case extensionRefused(String)
var errorDescription: String? {
switch self {
case .extensionUnavailable: return "The extension is not running"
case let .screeningDidNotStart(status): return "Screening did not start (\(status.label))"
case let .extensionRefused(reply): return "The extension replied \(reply)"
case let .extensionStopped(reason):
return "The extension stopped: \(reason). Its log: log show --last 5m --predicate 'subsystem BEGINSWITH \"\(FirewallIDs.appBundleID)\"'"
}
@@ -53,7 +51,6 @@ final class FirewallModel: NSObject, ObservableObject {
@Published private(set) var completed = false
@Published private(set) var removed = false
@Published private(set) var screening = false
@Published private(set) var blocked: [BlockedPackage] = []
private let logger = Logger(subsystem: FirewallIDs.appBundleID, category: "installer")
private var pendingRequest: (request: OSSystemExtensionRequest, continuation: CheckedContinuation<Void, Error>)?
@@ -75,7 +72,6 @@ final class FirewallModel: NSObject, ObservableObject {
await refresh()
if CommandLine.arguments.contains("--install") { await install() }
}
Task { await watchBlocks() }
}
// MARK: - Flows
@@ -203,39 +199,6 @@ final class FirewallModel: NSObject, ObservableObject {
if let url = URL(string: pane) { NSWorkspace.shared.open(url) }
}
/// Trusting changes the config for every user, so it takes an admin.
func allow(_ package: BlockedPackage, _ allowance: Allowance) async {
guard package.trustable else { return }
if allowance == .always, !AdminAuthorization.confirm() {
log("Trust cancelled for \(package.label)")
return
}
do {
let reply = try await providerMessage("\(allowance == .once ? "allow-once" : "allow") \(package.id)")
guard reply == "ok" || reply == "late" else { throw FirewallError.extensionRefused(reply) }
blocked.removeAll { $0 == package }
log("Allowed \(package.label) (\(package.eco)) \(allowance)")
if reply == "late" { BlockAlert.late(package, allowance) }
} catch {
log("Could not allow \(package.label): \(error.localizedDescription)")
}
}
/// The extension cannot message the app, so the app asks it for blocks.
private func watchBlocks() async {
while true {
if screening, let reply = try? await providerMessage("blocks"),
let packages = try? JSONDecoder().decode([BlockedPackage].self, from: Data(reply.utf8)) {
for package in packages where !blocked.contains(package) {
blocked.append(package)
if let allowance = BlockAlert.show(package) { await allow(package, allowance) }
}
blocked = Array(blocked.suffix(10))
}
try? await Task.sleep(nanoseconds: 500_000_000)
}
}
private func stage(_ step: ReferenceWritableKeyPath<FirewallModel, StepStatus>,
running: String,
work: @MainActor () async throws -> String) async -> Bool {
@@ -317,10 +280,10 @@ final class FirewallModel: NSObject, ObservableObject {
return true
}
/// The extension wrote these as root, so the bundled firewall-uninstall removes them behind an admin prompt; returns what to report if it failed.
/// The extension wrote these as root, so the bundled CLI removes them behind an admin prompt; returns what to report if it failed.
private func removeStoredCA() -> String? {
let uninstaller = Bundle.main.path(forAuxiliaryExecutable: "firewall-uninstall") ?? ""
let script = "do shell script quoted form of \"\(uninstaller)\" with administrator privileges"
let cli = Bundle.main.path(forAuxiliaryExecutable: "firewall") ?? ""
let script = "do shell script quoted form of \"\(cli)\" & \" uninstall\" with administrator privileges"
var error: NSDictionary?
NSAppleScript(source: script)?.executeAndReturnError(&error)
if let error {
-23
View File
@@ -22,28 +22,5 @@ struct MenuBarView: View {
Task { await model.restart() }
}
.disabled(model.busy)
if !model.blocked.isEmpty {
Divider()
ForEach(model.blocked) { package in
if !package.malicious {
Menu("Held back \(package.label) (\(package.eco))") {
Text(package.reason)
Button("Allow Once") {
Task { await model.allow(package, .once) }
}
.disabled(model.busy || !package.trustable)
Button("Trust this version") {
Task { await model.allow(package, .always) }
}
.disabled(model.busy || !package.trustable)
}
} else {
Menu("Blocked \(package.label) (\(package.eco))") {
Text("Malicious: \(package.reason)")
}
}
}
}
}
}
+1 -2
View File
@@ -47,7 +47,6 @@ build() {
echo "==> Building"
xcodegen generate >/dev/null
xcodebuild -project Firewall.xcodeproj -scheme StrixFirewall -configuration $CONFIGURATION \
-destination generic/platform=macOS \
-derivedDataPath build CODE_SIGNING_ALLOWED=NO CODE_SIGNING_REQUIRED=NO \
CODE_SIGN_IDENTITY="" CODE_SIGN_ENTITLEMENTS="" build >/dev/null
}
@@ -56,7 +55,7 @@ sign() {
echo "==> Signing with $IDENTITY"
cp "$(profile_for $APP_ID)" "$APP/Contents/embedded.provisionprofile"
cp "$(profile_for $EXT_ID)" "$EXT/Contents/embedded.provisionprofile"
codesign --force --options runtime --timestamp -s "$IDENTITY" "$APP/Contents/MacOS/firewall-uninstall"
codesign --force --options runtime --timestamp -s "$IDENTITY" "$APP/Contents/MacOS/firewall"
codesign --force --options runtime --timestamp \
--entitlements Extension/Extension.entitlements -s "$IDENTITY" "$EXT"
codesign --force --options runtime --timestamp \
+5 -13
View File
@@ -10,7 +10,7 @@ settings:
"CARGO_PROFILE[config=Debug]": debug
"LIBRARY_SEARCH_PATHS[arch=arm64]": $(SRCROOT)/../core/target/aarch64-apple-darwin/$(CARGO_PROFILE)
"LIBRARY_SEARCH_PATHS[arch=x86_64]": $(SRCROOT)/../core/target/x86_64-apple-darwin/$(CARGO_PROFILE)
ARCHS: arm64 x86_64
ARCHS: arm64
"ONLY_ACTIVE_ARCH[config=Debug]": "YES"
SWIFT_VERSION: "5.0"
DEVELOPMENT_TEAM: ${TEAM}
@@ -118,22 +118,14 @@ targets:
- target: Extension
embed: true
codeSign: true
# Uninstall runs this as root to remove what the extension left.
# Uninstall runs the CLI as root to remove what the extension left.
postBuildScripts:
- name: Embed firewall-uninstall
- name: Embed the CLI
basedOnDependencyAnalysis: false
script: |
export PATH="$HOME/.cargo/bin:$PATH"
unset CC CXX CFLAGS CXXFLAGS
export SDKROOT="$(xcrun --sdk macosx --show-sdk-path)"
cd "$SRCROOT/../core"
bins=
for arch in $ARCHS; do
case $arch in
arm64|arm64e) triple=aarch64-apple-darwin ;;
x86_64) triple=x86_64-apple-darwin ;;
esac
cargo build --bin firewall-uninstall --features machine-wide --target $triple $([ "$CONFIGURATION" = Debug ] || echo --release)
bins="$bins target/$triple/$CARGO_PROFILE/firewall-uninstall"
done
lipo -create $bins -output "$TARGET_BUILD_DIR/$EXECUTABLE_FOLDER_PATH/firewall-uninstall"
cargo build --bin firewall --target aarch64-apple-darwin $([ "$CONFIGURATION" = Debug ] || echo --release)
cp "target/aarch64-apple-darwin/$CARGO_PROFILE/firewall" "$TARGET_BUILD_DIR/$EXECUTABLE_FOLDER_PATH/"