radrootsd

rshr_202_step_303_gate.rs (13856B)

---

 use std::env;
 use std::fs;
 use std::path::{Path, PathBuf};
 use std::process::{Command, Output};
 
 use serde_json::{Value, json};
 use sha2::{Digest, Sha256};
 
 const STEP: u16 = 303;
 const GATE_DIGEST: &str = "79dc2cfbe14c07aeefba9779d61823291c7101d93fece3935909fc13f02261d0";
 const LIB_REVISION: &str = "055096853fca95e15d0f813d33a14aca13be3881";
 const NIX_SHA256: &str = "a59ab70f97f6d571642d13c7506aafec0a4275520d53daee2d8451be7c495cd1";
 const NIX_VERSION_SHA256: &str = "6db806391ffaea4cdb08ade0031feac399c0cd08474b3bfde8cb33f88a36c8e1";
 const MAX_OUTPUT_BYTES: usize = 32 * 1024 * 1024;
 
 const EXACT_SOURCES: &[(&str, &str)] = &[
     (
         "Cargo.lock",
         "b9278c33ad53b93e02b68017e5f8b62616feac9c6779747f1d446fe69c642052",
     ),
     (
         "Cargo.toml",
         "a29ad1fa4fd60ac96b0b52698f3cd9fadb1324a890aa4f8fd1bc9a86935a8e8f",
     ),
     (
         "flake.lock",
         "5d5b11622c341292f429a5f93e55f38a3506431b139720ff62f983b35bf7d55f",
     ),
     (
         "flake.nix",
         "96d777e49c572087c4411b27e47f1b15e32983317cb24b9f9058485b4d090bab",
     ),
 ];
 
 pub(crate) struct Arguments {
     pub(crate) step: u16,
     pub(crate) check_id: String,
     pub(crate) source_revision: String,
     pub(crate) source_tree: String,
     pub(crate) candidate_digest: String,
     pub(crate) platform: String,
     pub(crate) execution_request_sha256: String,
 }
 
 fn root() -> PathBuf {
     Path::new(env!("CARGO_MANIFEST_DIR"))
         .parent()
         .and_then(Path::parent)
         .expect("xtask must remain under tools/xtask")
         .to_path_buf()
 }
 
 fn sha256(bytes: &[u8]) -> String {
     hex::encode(Sha256::digest(bytes))
 }
 
 fn canonical(value: &Value) -> Result<Vec<u8>, String> {
     serde_json::to_vec(value).map_err(|_| "Step 303 JSON encoding failed".to_owned())
 }
 
 fn execute(command: &mut Command, label: &str) -> Result<Output, String> {
     let output = command
         .current_dir(root())
         .env("CARGO_NET_OFFLINE", "true")
         .env("CARGO_TERM_COLOR", "never")
         .output()
         .map_err(|_| format!("{label} could not start"))?;
     if output.stdout.len() > MAX_OUTPUT_BYTES || output.stderr.len() > MAX_OUTPUT_BYTES {
         return Err(format!("{label} exceeded its output bound"));
     }
     Ok(output)
 }
 
 fn bounded(command: &mut Command, label: &str) -> Result<Output, String> {
     let output = execute(command, label)?;
     if !output.status.success() {
         return Err(format!("{label} failed"));
     }
     Ok(output)
 }
 
 fn rejected(command: &mut Command, label: &str) -> Result<(), String> {
     if execute(command, label)?.status.success() {
         return Err(format!("{label} unexpectedly succeeded"));
     }
     Ok(())
 }
 
 fn resolve_nix() -> Result<PathBuf, String> {
     if let Some(explicit) = env::var_os("RSHR_NIX_EXECUTABLE") {
         return fs::canonicalize(explicit)
             .map_err(|_| "Step 303 Nix client is unavailable".to_owned());
     }
     let path = env::var_os("PATH").ok_or_else(|| "Step 303 PATH is absent".to_owned())?;
     env::split_paths(&path)
         .map(|directory| directory.join("nix"))
         .find(|candidate| candidate.is_file())
         .and_then(|candidate| fs::canonicalize(candidate).ok())
         .ok_or_else(|| "Step 303 Nix client is unavailable".to_owned())
 }
 
 fn object_keys(value: &Value, label: &str) -> Result<Vec<String>, String> {
     let mut keys = value
         .as_object()
         .ok_or_else(|| format!("Step 303 {label} is not an object"))?
         .keys()
         .cloned()
         .collect::<Vec<_>>();
     keys.sort_unstable();
     Ok(keys)
 }
 
 fn require_lock() -> Result<(), String> {
     let lock: Value = serde_json::from_slice(
         &fs::read(root().join("flake.lock"))
             .map_err(|_| "Step 303 flake lock is unreadable".to_owned())?,
     )
     .map_err(|_| "Step 303 flake lock is invalid".to_owned())?;
     if lock.pointer("/nodes/root/inputs/lib") != Some(&json!("lib"))
         || lock.pointer("/nodes/lib/locked/rev") != Some(&json!(LIB_REVISION))
         || lock.pointer("/nodes/lib/original/rev") != Some(&json!(LIB_REVISION))
     {
         return Err("Step 303 exact Nix tooling input differs".to_owned());
     }
     Ok(())
 }
 
 fn require_outputs(nix: &Path) -> Result<(), String> {
     let show = bounded(
         Command::new(nix).args([
             "--offline",
             "flake",
             "show",
             "--json",
             "--all-systems",
             "--no-write-lock-file",
         ]),
         "Step 303 Nix output inventory",
     )?;
     let inventory: Value = serde_json::from_slice(&show.stdout)
         .map_err(|_| "Step 303 Nix output inventory is invalid".to_owned())?;
     if object_keys(&inventory, "root output inventory")? != ["apps", "checks", "packages"] {
         return Err("Step 303 root output inventory differs".to_owned());
     }
     let systems = ["aarch64-darwin", "x86_64-linux"];
     for family in ["apps", "checks", "packages"] {
         if object_keys(&inventory[family], family)? != systems {
             return Err(format!("Step 303 {family} systems differ"));
         }
     }
     for system in systems {
         if object_keys(&inventory["apps"][system], "apps")? != ["default"]
             || object_keys(&inventory["checks"][system], "checks")? != ["default"]
             || object_keys(&inventory["packages"][system], "packages")? != ["default"]
             || inventory["apps"][system]["default"]["description"]
                 != "Run the built radrootsd daemon"
             || inventory["checks"][system]["default"]["name"] != "radrootsd-check-1"
             || inventory["packages"][system]["default"]["name"] != "radrootsd-0.1.0"
         {
             return Err("Step 303 radrootsd output inventory differs".to_owned());
         }
     }
     for system in ["x86_64-darwin", "aarch64-linux", "x86_64-windows"] {
         rejected(
             Command::new(nix).args([
                 "--offline",
                 "eval",
                 "--raw",
                 &format!(".#packages.{system}.default.name"),
             ]),
             "Step 303 excluded-system evaluation",
         )?;
     }
     for attribute in [
         ".#devShells.aarch64-darwin.default.name",
         ".#nixosModules.default",
         ".#packages.x86_64-linux.oci.name",
     ] {
         rejected(
             Command::new(nix).args(["--offline", "eval", "--raw", attribute]),
             "Step 303 unowned output evaluation",
         )?;
     }
     Ok(())
 }
 
 fn require_nix() -> Result<(), String> {
     let executable = resolve_nix()?;
     if sha256(&fs::read(&executable).map_err(|_| "Step 303 Nix client is unreadable")?)
         != NIX_SHA256
     {
         return Err("Step 303 Nix client identity differs".to_owned());
     }
     let version = bounded(
         Command::new(&executable).arg("--version"),
         "Step 303 Nix version",
     )?;
     if sha256(&version.stdout) != NIX_VERSION_SHA256 {
         return Err("Step 303 Nix version differs".to_owned());
     }
     bounded(
         Command::new(&executable).args([
             "--offline",
             "flake",
             "check",
             "--all-systems",
             "--no-build",
             "--no-write-lock-file",
         ]),
         "Step 303 Nix evaluation",
     )?;
     require_outputs(&executable)
 }
 
 fn expected_contract(verifier_sha256: &str) -> Value {
     json!({
         "argv_template": [
             "cargo", "extbuild", "run", "--", "cargo", "run", "--offline", "--locked",
             "-q", "-p", "radrootsd_xtask", "--", "rshr-step-303-gate", "--step={step}",
             "--check-id={check_id}", "--source-revision={source_revision}",
             "--source-tree={source_tree}", "--candidate-digest={candidate_digest}",
             "--platform=macos_aarch64",
             "--execution-request-sha256={execution_request_sha256}"
         ],
         "assertion_id": [format!("step_303_gate_01_{GATE_DIGEST}")],
         "check_id": format!("gate-01-{GATE_DIGEST}"),
         "environment_authority": {
             "cache_policy_id": "rshr-200-step-287-cache-policy.v1",
             "cache_policy_sha256": "3e81d178bce97b6c349dfbb00c68fd6f620ac00b1a1c8d37b12e9998f3c9eaaa",
             "cadence_policy_id": "rshr-200-step-287-cadence-policy.v1",
             "cadence_policy_sha256": "d24903df8659ee3772297c84994911efe7d21cb8b988320ddc6ddce0431892a1",
             "isolation": "extbuild_host_constrained",
             "network": "disabled",
             "network_policy_id": "none",
             "network_policy_sha256": "none",
             "resource_policy_id": "rshr-200-step-287-resource-policy.v1",
             "resource_policy_sha256": "05d3c7a89185d3c55678d97955193fce2ed92b1eee5af99083d77ea64c98d14e"
         },
         "environment_names": [
             "EXT_BUILD_CONFIG", "EXT_BUILD_MACHINE_CONFIG", "EXT_BUILD_ROOT", "HOME", "PATH",
             "RUSTUP_TOOLCHAIN", "TMPDIR"
         ],
         "gate_definition_sha256": GATE_DIGEST,
         "required_platforms": ["macos_aarch64"],
         "required_tools": ["rustc"],
         "result_schema": "radroots.services-hardening.rshr-200-step-check-result.v1",
         "schema": "radroots.services-hardening.rshr-200-step-check-command.v1",
         "step": STEP,
         "verifier_path": "tools/xtask/src/rshr_202_step_303_gate.rs",
         "verifier_sha256": verifier_sha256
     })
 }
 
 pub(crate) fn run(arguments: Arguments) -> Result<(), String> {
     let check_id = format!("gate-01-{GATE_DIGEST}");
     if arguments.step != STEP
         || arguments.check_id != check_id
         || arguments.candidate_digest != "none"
         || arguments.platform != "macos_aarch64"
         || arguments.source_revision.len() != 40
         || arguments.source_tree.len() != 40
         || arguments.execution_request_sha256.len() != 64
         || !arguments
             .source_revision
             .bytes()
             .chain(arguments.source_tree.bytes())
             .chain(arguments.execution_request_sha256.bytes())
             .all(|byte| byte.is_ascii_hexdigit() && !byte.is_ascii_uppercase())
     {
         return Err("Step 303 gate arguments differ".to_owned());
     }
     let root = root();
     if root.join(".github").exists() || root.join(".act").exists() || root.join("docs").exists() {
         return Err("Step 303 forbidden repository root is present".to_owned());
     }
     for (relative, expected) in EXACT_SOURCES {
         let bytes = fs::read(root.join(relative))
             .map_err(|_| "Step 303 governed source is unreadable".to_owned())?;
         if sha256(&bytes) != *expected {
             return Err("Step 303 governed source bytes differ".to_owned());
         }
     }
     let flake_source = fs::read_to_string(root.join("flake.nix"))
         .map_err(|_| "Step 303 flake source is unreadable".to_owned())?;
     for forbidden in [
         "writeShellApplication",
         "git rev-parse",
         "repo_root",
         "devShells",
         "nixosModules",
         "aarch64-linux",
         "x86_64-darwin",
     ] {
         if flake_source.contains(forbidden) {
             return Err("Step 303 checkout wrapper or unowned output is present".to_owned());
         }
     }
 
     let verifier_path = root.join("tools/xtask/src/rshr_202_step_303_gate.rs");
     let verifier_sha256 =
         sha256(&fs::read(verifier_path).map_err(|_| "Step 303 verifier is unreadable")?);
     let authority_path = root.join("contracts/rshr-202-step-303-gates.v1.json");
     let authority_bytes =
         fs::read(authority_path).map_err(|_| "Step 303 gate authority is unreadable")?;
     let authority: Value = serde_json::from_slice(&authority_bytes)
         .map_err(|_| "Step 303 gate authority is invalid".to_owned())?;
     let mut canonical_authority = canonical(&authority)?;
     canonical_authority.push(b'\n');
     let contracts = authority
         .get("gate_command_contract")
         .and_then(Value::as_array)
         .ok_or_else(|| "Step 303 gate contract is absent".to_owned())?;
     if authority_bytes != canonical_authority
         || authority.get("schema")
             != Some(&Value::String(
                 "radroots.radrootsd.rshr-202-step-303-gates.v1".to_owned(),
             ))
         || authority.get("step") != Some(&json!([STEP]))
         || contracts.as_slice() != [expected_contract(&verifier_sha256)]
     {
         return Err("Step 303 gate authority differs".to_owned());
     }
 
     require_lock()?;
     bounded(
         Command::new("cargo").args(["+1.97.1", "fmt", "--all", "--", "--check"]),
         "Step 303 formatting",
     )?;
     bounded(
         Command::new("cargo").args([
             "+1.97.1",
             "check",
             "--offline",
             "--locked",
             "--workspace",
             "--all-targets",
         ]),
         "Step 303 Cargo check",
     )?;
     require_nix()?;
 
     let contract = &contracts[0];
     let assertion = json!([{
         "id": format!("step_303_gate_01_{GATE_DIGEST}"),
         "result": "pass"
     }]);
     let result = json!({
         "schema": "radroots.services-hardening.rshr-200-step-check-result.v1",
         "step": STEP,
         "check_id": check_id,
         "gate_definition_sha256": GATE_DIGEST,
         "source_revision": arguments.source_revision,
         "source_tree": arguments.source_tree,
         "candidate_generation": 0,
         "candidate_digest": "none",
         "command_contract_sha256": sha256(&canonical(contract)?),
         "verifier_sha256": verifier_sha256,
         "execution_request": [{
             "platform": arguments.platform,
             "sha256": arguments.execution_request_sha256
         }],
         "assertion_inventory_sha256": sha256(&canonical(&assertion)?),
         "assertion": assertion,
         "result": "pass"
     });
     let mut bytes = canonical(&result)?;
     bytes.push(b'\n');
     std::io::Write::write_all(&mut std::io::stdout().lock(), &bytes)
         .map_err(|_| "Step 303 result write failed".to_owned())
 }