use std::collections::BTreeMap;
use std::path::Path;
use std::process::Command;
fn main() {
// Phase 17 (Track E.1): always emit the seccomp policy table to
// OUT_DIR. Gated runtime via `#[cfg(target_os = "linux")]`, but the
// codegen runs on every host so `cargo check` on macOS still emits
// the file (the include never actually compiles on non-Linux).
emit_seccomp_policy();
// Only relevant when the serve feature is active.
if std::env::var("CARGO_FEATURE_SERVE").is_err() {
return;
}
let dist_dir = Path::new("src/server/assets/dist");
let index_html = dist_dir.join("index.html");
// Re-run build.rs only when dist output is missing/changed
println!("cargo:rerun-if-changed=src/server/assets/dist/index.html");
if index_html.exists() {
// Dist already built, nothing to do
return;
}
// Dist missing, try to build frontend
let frontend_dir = Path::new("frontend");
if !frontend_dir.join("package.json").exists() {
emit_placeholder_and_warn(dist_dir);
return;
}
// Run npm install + build
println!("cargo:warning=Frontend dist not found, running npm install && npm run build...");
let npm_install = Command::new("npm")
.arg("install")
.current_dir(frontend_dir)
.status();
match npm_install {
Ok(s) if s.success() => {}
_ => {
emit_placeholder_and_warn(dist_dir);
return;
}
}
let npm_build = Command::new("npm")
.arg("run")
.arg("build")
.current_dir(frontend_dir)
.status();
match npm_build {
Ok(s) if s.success() => {
println!("cargo:warning=Frontend built successfully.");
}
_ => {
emit_placeholder_and_warn(dist_dir);
}
}
}
fn emit_placeholder_and_warn(dist_dir: &Path) {
// Create minimal placeholder files so compilation succeeds
std::fs::create_dir_all(dist_dir).ok();
std::fs::write(
dist_dir.join("index.html"),
"Frontend not built
Run: cd frontend && npm install && npm run build
",
)
.ok();
std::fs::write(dist_dir.join("app.js"), "// frontend not built\n").ok();
std::fs::write(dist_dir.join("style.css"), "/* frontend not built */\n").ok();
println!(
"cargo:warning=Node.js/npm not available — wrote placeholder frontend assets. Run 'cd frontend && npm install && npm run build' for the real UI."
);
}
// ── Phase 17 (Track E.1) — seccomp policy codegen ────────────────────────────
const SECCOMP_POLICY_PATH: &str = "src/dynamic/sandbox/seccomp/seccomp_policy.toml";
/// Cap-name → Cap bit value table. Mirrors the `bitflags!` block in
/// `src/labels/mod.rs`. Keep in sync when adding/removing `Cap`
/// constants.
const CAP_BIT_FOR_NAME: &[(&str, u32)] = &[
("ENV_VAR", 1 << 0),
("HTML_ESCAPE", 1 << 1),
("SHELL_ESCAPE", 1 << 2),
("URL_ENCODE", 1 << 3),
("JSON_PARSE", 1 << 4),
("FILE_IO", 1 << 5),
("FMT_STRING", 1 << 6),
("SQL_QUERY", 1 << 7),
("DESERIALIZE", 1 << 8),
("SSRF", 1 << 9),
("CODE_EXEC", 1 << 10),
("CRYPTO", 1 << 11),
("UNAUTHORIZED_ID", 1 << 12),
("DATA_EXFIL", 1 << 13),
("LDAP_INJECTION", 1 << 14),
("XPATH_INJECTION", 1 << 15),
("HEADER_INJECTION", 1 << 16),
("OPEN_REDIRECT", 1 << 17),
("SSTI", 1 << 18),
("XXE", 1 << 19),
("PROTOTYPE_POLLUTION", 1 << 20),
];
fn emit_seccomp_policy() {
println!("cargo:rerun-if-changed={}", SECCOMP_POLICY_PATH);
let out_dir = std::env::var("OUT_DIR").expect("OUT_DIR must be set by cargo");
let out_path = Path::new(&out_dir).join("seccomp_policy.rs");
// Read the policy file; on missing file (e.g. fresh checkout on a
// foreign target), emit empty tables so compilation still succeeds.
let toml_text = match std::fs::read_to_string(SECCOMP_POLICY_PATH) {
Ok(s) => s,
Err(_) => {
std::fs::write(
&out_path,
"pub static BASE: &[&str] = &[];\npub static CAP: &[(u32, &[&str])] = &[];\n",
)
.expect("write empty seccomp policy stub");
return;
}
};
let parsed = parse_seccomp_toml(&toml_text);
let mut out = String::new();
out.push_str("// generated by build.rs from seccomp_policy.toml — do not edit\n\n");
// Base allowlist.
out.push_str("pub static BASE: &[&str] = &[\n");
for name in &parsed.base {
out.push_str(&format!(" \"{}\",\n", escape(name)));
}
out.push_str("];\n\n");
// Per-cap allowlists.
out.push_str("pub static CAP: &[(u32, &[&str])] = &[\n");
for (cap_name, allow) in &parsed.caps {
let bit = CAP_BIT_FOR_NAME
.iter()
.find(|(n, _)| *n == cap_name.as_str())
.map(|(_, b)| *b)
.unwrap_or_else(|| panic!(
"seccomp_policy.toml references unknown Cap '{cap_name}' — \
add it to CAP_BIT_FOR_NAME in build.rs first"
));
out.push_str(&format!(" (0x{bit:08x}_u32, &[\n"));
for name in allow {
out.push_str(&format!(" \"{}\",\n", escape(name)));
}
out.push_str(" ]),\n");
}
out.push_str("];\n");
std::fs::write(&out_path, out).expect("write seccomp policy table");
}
#[derive(Default)]
struct SeccompPolicy {
base: Vec,
caps: BTreeMap>,
}
/// Tiny line-oriented TOML parser scoped to the shape used by
/// `seccomp_policy.toml`:
///
/// [base]
/// allow = ["read", "write", ...]
///
/// [cap.SQL_QUERY]
/// allow = [
/// "fdatasync",
/// ...
/// ]
///
/// Comments (`#`) and blank lines are skipped. Multi-line array bodies
/// are accumulated until the closing `]`.
fn parse_seccomp_toml(src: &str) -> SeccompPolicy {
let mut policy = SeccompPolicy::default();
let mut current_section: Option = None;
let mut accumulating_array: Option = None;
let mut array_buf = String::new();
for raw_line in src.lines() {
let line = strip_comment(raw_line).trim();
if line.is_empty() {
continue;
}
if let Some(_key) = accumulating_array.as_ref() {
array_buf.push_str(line);
array_buf.push('\n');
if line.contains(']') {
let key = accumulating_array.take().unwrap();
let values = parse_string_array(&array_buf);
store_allow(&mut policy, current_section.as_deref(), &key, values);
array_buf.clear();
}
continue;
}
if let Some(section) = line.strip_prefix('[').and_then(|s| s.strip_suffix(']')) {
current_section = Some(section.to_string());
continue;
}
if let Some((key, rest)) = line.split_once('=') {
let key = key.trim().to_string();
let rest = rest.trim();
if rest.starts_with('[') && rest.contains(']') {
let values = parse_string_array(rest);
store_allow(&mut policy, current_section.as_deref(), &key, values);
} else if rest.starts_with('[') {
accumulating_array = Some(key);
array_buf.push_str(rest);
array_buf.push('\n');
}
continue;
}
}
policy
}
fn strip_comment(line: &str) -> &str {
let mut in_string = false;
let bytes = line.as_bytes();
for (i, &b) in bytes.iter().enumerate() {
match b {
b'"' => in_string = !in_string,
b'#' if !in_string => return &line[..i],
_ => {}
}
}
line
}
fn parse_string_array(src: &str) -> Vec {
// Find every "..." run between the first `[` and the last `]`.
let start = src.find('[').map(|i| i + 1).unwrap_or(0);
let end = src.rfind(']').unwrap_or(src.len());
let body = &src[start..end];
let mut out = Vec::new();
let mut chars = body.chars().peekable();
while let Some(c) = chars.next() {
if c == '"' {
let mut s = String::new();
for c2 in chars.by_ref() {
if c2 == '"' {
break;
}
s.push(c2);
}
out.push(s);
}
}
out
}
fn store_allow(policy: &mut SeccompPolicy, section: Option<&str>, key: &str, values: Vec) {
if key != "allow" {
return;
}
match section {
Some("base") => policy.base = values,
Some(other) => {
if let Some(cap_name) = other.strip_prefix("cap.") {
policy.caps.insert(cap_name.to_string(), values);
}
}
None => {}
}
}
fn escape(s: &str) -> String {
s.replace('\\', "\\\\").replace('"', "\\\"")
}