lib

rshr_202_step_299_gate.rs (22306B)

---

 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 = 299;
 const GATE_DIGEST: &str = "b76f61a9a5365ca088d4b00eb140ed30b0b51f418cba68e26e3f3cf1c0ff3a15";
 const NIX_SHA256: &str = "a59ab70f97f6d571642d13c7506aafec0a4275520d53daee2d8451be7c495cd1";
 const NIX_VERSION_SHA256: &str = "6db806391ffaea4cdb08ade0031feac399c0cd08474b3bfde8cb33f88a36c8e1";
 const MAX_OUTPUT_BYTES: usize = 32 * 1024 * 1024;
 
 const EXACT_SOURCES: &[(&str, &str)] = &[
     (
         "flake.nix",
         "de3d2258f2c48ae8b1493b676ab3d1466cd5f1a59015f65283efbfe12447e501",
     ),
     (
         "build/nix/library.nix",
         "ff425fe6361bad78c105e36d3e900950ce22b0034e26add55e5ed287aa868765",
     ),
     (
         "build/nix/service/native-inputs.nix",
         "09aed688d6ad6c5c824aa771b871cc0c4857d8378d1330221c8d5a05509d9391",
     ),
     (
         "build/nix/service/nixos-module.nix",
         "20b42dd6972c59fcaaf5a282219644d83822ea03a2805bfe8e6e9b8f7b628622",
     ),
     (
         "build/nix/service/fixture.nix",
         "f3fa0cbef4f6a86feee9b2319165d97c51526236b1426ffa83ffb435ed90cd97",
     ),
     (
         "build/nix/service/systems.nix",
         "d16e21827022a2315234f4c5e4b485017a36ecd90a5559b01d23331cdd505e46",
     ),
 ];
 
 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 299 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 299 Nix client is unavailable".to_owned());
     }
     let path = env::var_os("PATH").ok_or_else(|| "Step 299 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 299 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 299 {label} is not an object"))?
         .keys()
         .cloned()
         .collect::<Vec<_>>();
     keys.sort_unstable();
     Ok(keys)
 }
 
 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 299 Nix output inventory",
     )?;
     let inventory: Value = serde_json::from_slice(&show.stdout)
         .map_err(|_| "Step 299 Nix output inventory is invalid".to_owned())?;
     validate_output_inventory(&inventory)?;
 
     let supported = bounded(
         Command::new(nix).args(["--offline", "eval", "--json", ".#lib.supportedSystems"]),
         "Step 299 shared-helper systems",
     )?;
     if supported.stdout != b"[\"aarch64-darwin\",\"x86_64-linux\"]\n" {
         return Err("Step 299 shared-helper systems differ".to_owned());
     }
     let helper_type = bounded(
         Command::new(nix).args([
             "--offline",
             "eval",
             "--raw",
             "--apply",
             "f: builtins.typeOf f",
             ".#lib.mkServiceHelpers",
         ]),
         "Step 299 shared-helper export",
     )?;
     if helper_type.stdout != b"lambda" {
         return Err("Step 299 shared-helper export 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 299 excluded-system evaluation",
         )?;
     }
     Ok(())
 }
 
 fn validate_output_inventory(inventory: &Value) -> Result<(), String> {
     let systems = ["aarch64-darwin", "x86_64-linux"];
     for family in ["apps", "checks", "devShells", "formatter", "packages"] {
         if object_keys(&inventory[family], family)? != systems {
             return Err(format!("Step 299 {family} systems differ"));
         }
     }
     if inventory.pointer("/overlays/default/type") != Some(&json!("nixpkgs-overlay")) {
         return Err("Step 299 default overlay is absent".to_owned());
     }
     for system in systems {
         let packages = &inventory["packages"][system];
         if object_keys(packages, "packages")? != ["default", "xtask"]
             || packages["default"]["name"] != "radroots-lib-release-bundle-0.1.0-alpha"
         {
             return Err("Step 299 package inventory differs".to_owned());
         }
         if inventory["apps"][system]["default"]["description"]
             != "Inspect the installed Radroots Lib release bundle"
             || inventory["devShells"][system].get("default").is_none()
             || inventory["checks"][system].get("release-bundle").is_none()
         {
             return Err("Step 299 production output is absent".to_owned());
         }
         for family in ["apps", "devShells", "packages"] {
             if object_keys(&inventory[family][system], family)?
                 .iter()
                 .any(|name| name.contains("fixture"))
             {
                 return Err("Step 299 fixture escaped its test-only surface".to_owned());
             }
         }
         let fixture_checks = object_keys(&inventory["checks"][system], "checks")?
             .into_iter()
             .filter(|name| name.contains("fixture"))
             .collect::<Vec<_>>();
         if fixture_checks.is_empty()
             || fixture_checks
                 .iter()
                 .any(|name| !name.starts_with("service-fixture-"))
         {
             return Err("Step 299 fixture check names differ".to_owned());
         }
     }
 
     Ok(())
 }
 
 fn require_nix() -> Result<(), String> {
     let executable = resolve_nix()?;
     if sha256(&fs::read(&executable).map_err(|_| "Step 299 Nix client is unreadable")?)
         != NIX_SHA256
     {
         return Err("Step 299 Nix client identity differs".to_owned());
     }
     let version = bounded(
         Command::new(&executable).arg("--version"),
         "Step 299 Nix version",
     )?;
     if sha256(&version.stdout) != NIX_VERSION_SHA256 {
         return Err("Step 299 Nix version differs".to_owned());
     }
     bounded(
         Command::new(&executable).args([
             "--offline",
             "flake",
             "check",
             "--all-systems",
             "--no-build",
             "--no-write-lock-file",
         ]),
         "Step 299 Nix evaluation",
     )?;
     require_outputs(&executable)
 }
 
 fn expected_contract(verifier_sha256: &str) -> Value {
     json!({
         "argv_template": [
             "cargo", "extbuild", "run", "--", "cargo", "run", "--offline", "--locked",
             "-q", "-p", "xtask", "--", "rshr-step-299-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_299_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_299_gate.rs",
         "verifier_sha256": verifier_sha256
     })
 }
 
 fn validate_arguments(arguments: &Arguments) -> Result<String, 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 299 gate arguments differ".to_owned());
     }
     Ok(check_id)
 }
 
 pub(crate) fn run(arguments: Arguments) -> Result<(), String> {
     let check_id = validate_arguments(&arguments)?;
     let root = root();
     if root.join(".github").exists() {
         return Err("forbidden .github surface is present".to_owned());
     }
     for (relative, expected) in EXACT_SOURCES {
         let bytes = fs::read(root.join(relative))
             .map_err(|_| "Step 299 governed source is unreadable".to_owned())?;
         if sha256(&bytes) != *expected {
             return Err("Step 299 governed source bytes differ".to_owned());
         }
     }
 
     let verifier_path = root.join("tools/xtask/src/rshr_202_step_299_gate.rs");
     let verifier_sha256 =
         sha256(&fs::read(verifier_path).map_err(|_| "Step 299 verifier is unreadable".to_owned())?);
     let authority_path = root.join("contracts/rshr-202-step-299-gates.v1.json");
     let authority_bytes =
         fs::read(authority_path).map_err(|_| "Step 299 gate authority is unreadable".to_owned())?;
     let contract = validate_authority(&authority_bytes, &verifier_sha256)?;
 
     bounded(
         Command::new("cargo").args(["+1.97.1", "fmt", "--all", "--", "--check"]),
         "Step 299 formatting",
     )?;
     bounded(
         Command::new("cargo").args(["+1.97.1", "check", "--offline", "--locked", "-p", "xtask"]),
         "Step 299 verifier check",
     )?;
     require_nix()?;
 
     let bytes = result_bytes(&arguments, &check_id, &verifier_sha256, &contract)?;
     std::io::Write::write_all(&mut std::io::stdout().lock(), &bytes)
         .map_err(|_| "Step 299 result write failed".to_owned())
 }
 
 fn validate_authority(authority_bytes: &[u8], verifier_sha256: &str) -> Result<Value, String> {
     let authority: Value = serde_json::from_slice(authority_bytes)
         .map_err(|_| "Step 299 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 299 gate contract is absent".to_owned())?;
     if authority_bytes != canonical_authority
         || authority.get("schema")
             != Some(&Value::String(
                 "radroots.lib.rshr-202-step-299-gates.v1".to_owned(),
             ))
         || authority.get("step") != Some(&json!([STEP]))
         || contracts.as_slice() != [expected_contract(verifier_sha256)]
     {
         return Err("Step 299 gate authority differs".to_owned());
     }
     Ok(contracts[0].clone())
 }
 
 fn result_bytes(
     arguments: &Arguments,
     check_id: &str,
     verifier_sha256: &str,
     contract: &Value,
 ) -> Result<Vec<u8>, String> {
     let assertion = json!([{
         "id": format!("step_299_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');
     Ok(bytes)
 }
 
 #[cfg(test)]
 mod tests {
     use super::*;
 
     #[test]
     fn command_capture_preserves_status_streams_and_enforces_both_output_limits() {
         let output = bounded(
             Command::new("/bin/sh").args(["-c", "printf output; printf diagnostic >&2"]),
             "fixture",
         )
         .unwrap();
         assert_eq!(output.stdout, b"output");
         assert_eq!(output.stderr, b"diagnostic");
         assert_eq!(
             bounded(Command::new("/bin/sh").args(["-c", "exit 7"]), "fixture").unwrap_err(),
             "fixture failed"
         );
         let missing = tempfile::TempDir::new().unwrap();
         assert_eq!(
             bounded(&mut Command::new(missing.path().join("absent")), "fixture").unwrap_err(),
             "fixture could not start"
         );
         for script in ["head -c \"$1\" /dev/zero", "head -c \"$1\" /dev/zero >&2"] {
             let maximum = MAX_OUTPUT_BYTES.to_string();
             let output = bounded(
                 Command::new("/bin/sh").args(["-c", script, "fixture", &maximum]),
                 "fixture",
             )
             .unwrap();
             assert_eq!(output.stdout.len() + output.stderr.len(), MAX_OUTPUT_BYTES);
             let oversized = (MAX_OUTPUT_BYTES + 1).to_string();
             assert_eq!(
                 bounded(
                     Command::new("/bin/sh").args(["-c", script, "fixture", &oversized]),
                     "fixture"
                 )
                 .unwrap_err(),
                 "fixture exceeded its output bound"
             );
         }
     }
 
     #[test]
     fn expected_command_rejection_requires_a_nonzero_exit() {
         rejected(Command::new("/bin/sh").args(["-c", "exit 7"]), "fixture").unwrap();
         assert_eq!(
             rejected(Command::new("/bin/sh").args(["-c", "exit 0"]), "fixture").unwrap_err(),
             "fixture unexpectedly succeeded"
         );
     }
 
     fn arguments() -> Arguments {
         Arguments {
             step: STEP,
             check_id: format!("gate-01-{GATE_DIGEST}"),
             source_revision: "a".repeat(40),
             source_tree: "0".repeat(40),
             candidate_digest: "none".into(),
             platform: "macos_aarch64".into(),
             execution_request_sha256: "1".repeat(64),
         }
     }
 
     #[test]
     fn invalid_gate_arguments_are_rejected_before_external_work() {
         assert_eq!(
             validate_arguments(&arguments()).unwrap(),
             format!("gate-01-{GATE_DIGEST}")
         );
         for field in 0..8 {
             let mut invalid = arguments();
             match field {
                 0 => invalid.step = 0,
                 1 => invalid.check_id.clear(),
                 2 => invalid.candidate_digest = "unbound".into(),
                 3 => invalid.platform = "linux".into(),
                 4 => invalid.source_revision.clear(),
                 5 => invalid.source_tree.clear(),
                 6 => invalid.execution_request_sha256.clear(),
                 _ => invalid.source_revision = "A".repeat(40),
             }
             assert_eq!(run(invalid).unwrap_err(), "Step 299 gate arguments differ");
         }
         let mut invalid = arguments();
         invalid.source_tree = "g".repeat(40);
         assert!(validate_arguments(&invalid).is_err());
     }
 
     #[test]
     fn authority_requires_canonical_bytes_and_exact_retained_bindings() {
         let raw = include_bytes!("../../../contracts/rshr-202-step-299-gates.v1.json");
         let authority: Value = serde_json::from_slice(raw).unwrap();
         let verifier = authority["gate_command_contract"][0]["verifier_sha256"]
             .as_str()
             .unwrap();
         let contract = validate_authority(raw, verifier).unwrap();
         assert!(validate_authority(raw, &"f".repeat(64)).is_err());
         assert!(validate_authority(b"invalid", verifier).is_err());
         assert!(validate_authority(b"{}\n", verifier).is_err());
         assert!(
             validate_authority(&serde_json::to_vec_pretty(&authority).unwrap(), verifier).is_err()
         );
         for (pointer, value) in [
             ("/schema", json!("other")),
             ("/step", json!([0])),
             ("/gate_command_contract", json!([])),
         ] {
             let mut changed = authority.clone();
             *changed.pointer_mut(pointer).unwrap() = value;
             let mut bytes = canonical(&changed).unwrap();
             bytes.push(b'\n');
             assert!(validate_authority(&bytes, verifier).is_err());
         }
         // Encoding fixtures is not a historical gate execution or qualification.
         let args = arguments();
         let bytes = result_bytes(&args, &args.check_id, verifier, &contract).unwrap();
         let result: Value = serde_json::from_slice(&bytes).unwrap();
         assert!(bytes.ends_with(b"\n"));
         assert_eq!(result["source_revision"], args.source_revision);
         assert_eq!(result["source_tree"], args.source_tree);
         assert_eq!(
             result["execution_request"][0]["sha256"],
             args.execution_request_sha256
         );
         assert_eq!(
             result["command_contract_sha256"],
             sha256(&canonical(&contract).unwrap())
         );
         assert_eq!(
             result["assertion_inventory_sha256"],
             sha256(&canonical(&result["assertion"]).unwrap())
         );
     }
 
     #[test]
     fn retained_inventory_rejects_platform_drift_and_fixture_escape_without_nix() {
         let mut inventory = json!({"overlays":{"default":{"type":"nixpkgs-overlay"}}});
         for system in ["aarch64-darwin", "x86_64-linux"] {
             inventory["packages"][system] =
                 json!({"default":{"name":"radroots-lib-release-bundle-0.1.0-alpha"},"xtask":{}});
             inventory["apps"][system] = json!({"default":{"description":"Inspect the installed Radroots Lib release bundle"}});
             inventory["devShells"][system] = json!({"default":{}});
             inventory["checks"][system] =
                 json!({"release-bundle":{}, "service-fixture-example":{}});
             inventory["formatter"][system] = json!({});
         }
         validate_output_inventory(&inventory).unwrap();
         for family in ["apps", "checks", "devShells", "formatter", "packages"] {
             let mut changed = inventory.clone();
             changed[family]
                 .as_object_mut()
                 .unwrap()
                 .remove("aarch64-darwin");
             assert!(validate_output_inventory(&changed).is_err());
         }
         assert!(object_keys(&Value::Null, "test").is_err());
         for (pointer, value) in [
             ("/overlays/default/type", json!("wrong")),
             ("/packages/aarch64-darwin/default/name", json!("wrong")),
             ("/apps/aarch64-darwin/default/description", json!("wrong")),
             ("/devShells/aarch64-darwin", json!({})),
             ("/checks/aarch64-darwin", json!({})),
             ("/checks/aarch64-darwin", json!({"release-bundle":{}})),
             (
                 "/checks/aarch64-darwin",
                 json!({"release-bundle":{},"bad-fixture":{}}),
             ),
         ] {
             let mut changed = inventory.clone();
             *changed.pointer_mut(pointer).unwrap() = value;
             assert!(validate_output_inventory(&changed).is_err());
         }
         for family in ["apps", "devShells", "packages"] {
             let mut changed = inventory.clone();
             changed[family]["aarch64-darwin"]["fixture-escape"] = json!({});
             assert!(validate_output_inventory(&changed).is_err());
         }
     }
 }