lazaret/crates/lazaret-core/tests/configuration.rs

use std::collections::BTreeMap;
use std::fs;
use std::os::unix::fs::{MetadataExt, PermissionsExt, symlink};
use std::path::{Path, PathBuf};
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::{Arc, Barrier};

use lazaret_core::codec::{CodecError, decode, encode};
use lazaret_core::configuration::{
    ConfigurationErrorKind, ConfigurationLoadRequest, ConfinedPathPlan, ConfinedPathType,
    ResolvedDomainConfiguration, SandboxLayoutV1, derive_configuration_fingerprint,
    derive_domain_id, load_trusted_configuration, parse_trusted_configuration,
};
use lazaret_core::identity::HostPath;
use lazaret_core::records::{
    ConfigurationFingerprintRecordV1, DEFAULT_RUNSC_DCACHE, EnvironmentReference, MAX_RUNSC_DCACHE,
    ResolvedAutoApprovalRule, ResolvedVolume, VolumeAccess, VolumeKind,
};
use static_assertions::assert_not_impl_any;

assert_not_impl_any!(ResolvedDomainConfiguration: serde::Serialize, serde::de::DeserializeOwned);
assert_not_impl_any!(SandboxLayoutV1: serde::Serialize, serde::de::DeserializeOwned);
assert_not_impl_any!(ConfinedPathPlan: serde::Serialize, serde::de::DeserializeOwned);

static NEXT_TREE: AtomicU64 = AtomicU64::new(0);

struct TestTree(PathBuf);

impl TestTree {
    fn new() -> Self {
        let sequence = NEXT_TREE.fetch_add(1, Ordering::Relaxed);
        let parent = PathBuf::from(env!("CARGO_MANIFEST_DIR"))
            .join("../../target/test-artifacts/configuration");
        fs::create_dir_all(&parent).unwrap();
        let parent = parent.canonicalize().unwrap();
        let path = parent.join(format!(
            "lazaret-configuration-{}-{sequence}",
            std::process::id()
        ));
        fs::create_dir(&path).unwrap();
        Self(path)
    }

    fn path(&self) -> &Path {
        &self.0
    }
}

impl Drop for TestTree {
    fn drop(&mut self) {
        fs::remove_dir_all(&self.0).unwrap();
    }
}

fn write_configuration(tree: &TestTree, body: &str) -> PathBuf {
    let directory = tree.path().join("config");
    fs::create_dir(&directory).unwrap();
    let path = directory.join("config.toml");
    fs::write(&path, body).unwrap();
    path
}

fn layout() -> SandboxLayoutV1 {
    SandboxLayoutV1::from_protected_destinations([
        "/workspace".to_owned(),
        "/proc".to_owned(),
        "/sys".to_owned(),
        "/dev".to_owned(),
        "/run/lazaret".to_owned(),
    ])
    .unwrap()
}

fn request(
    tree: &TestTree,
    config: PathBuf,
    environment: BTreeMap<String, std::ffi::OsString>,
) -> ConfigurationLoadRequest {
    request_with_layout(tree, config, environment, layout())
}

fn request_with_layout(
    tree: &TestTree,
    config: PathBuf,
    environment: BTreeMap<String, std::ffi::OsString>,
    sandbox_layout: SandboxLayoutV1,
) -> ConfigurationLoadRequest {
    let workspace = tree.path().join("workspace");
    let runtime = tree.path().join("runtime");
    fs::create_dir_all(&workspace).unwrap();
    fs::create_dir_all(&runtime).unwrap();
    ConfigurationLoadRequest {
        explicit_configuration_path: Some(config),
        selected_profile: "default".into(),
        workspace,
        home: tree.path().join("home"),
        xdg_config_home: None,
        xdg_data_home: None,
        xdg_runtime_dir: runtime,
        environment,
        sandbox_layout,
    }
}

fn valid_configuration(tree: &TestTree) -> String {
    format!(
        r#"schema = "lazaret-trusted-host-config-v1"

[storage]
data_root = "{}"

[network]
default_allow = ["192.0.2.4/24", "198.51.100.53/32"]

[profiles.default]
image = "example.invalid/agent:v1"
persistent_dirs = ["/root"]
allow_egress = ["10.1.2.3/24"]
env = {{ TOKEN = "env:HOST_TOKEN" }}
volumes = [
  {{ host = "{{profile_dir}}/agent-state", container = "/root/.local/state/agent", kind = "directory", access = "read-write", create = true }},
]

[profiles.default.escalation]
enabled = false
"#,
        tree.path().join("data").display()
    )
}

#[test]
fn strict_parser_applies_defaults_and_rejects_every_unknown_level() {
    let minimal = r#"schema = "lazaret-trusted-host-config-v1"
[profiles.default]
image = "example.invalid/agent:v1"
"#;
    let parsed = parse_trusted_configuration(minimal.as_bytes()).unwrap();
    let profile = &parsed.profiles()["default"];
    assert!(profile.isolate_gitignored);
    assert_eq!(
        profile.persistent_dirs,
        ["/root", "/usr", "/var", "/etc", "/opt"]
    );
    assert!(profile.allow_egress.is_empty());
    assert!(profile.deny_egress.is_empty());
    assert!(profile.env.is_empty());
    assert!(profile.volumes.is_empty());
    assert!(!profile.escalation.enabled);
    assert!(profile.escalation.auto_approve.is_empty());
    assert!(parsed.storage().data_root.is_none());
    assert!(parsed.network().default_allow.is_empty());
    assert!(parsed.network().default_deny.is_empty());
    assert_eq!(parsed.runtime().runsc_dcache, DEFAULT_RUNSC_DCACHE);

    for (value, expected) in [
        ("[]", Vec::<String>::new()),
        ("[\"/nix\"]", vec!["/nix".to_owned()]),
    ] {
        let explicit = minimal.replace(
            "image = \"example.invalid/agent:v1\"",
            &format!("image = \"example.invalid/agent:v1\"\npersistent_dirs = {value}"),
        );
        assert_eq!(
            parse_trusted_configuration(explicit.as_bytes())
                .unwrap()
                .profiles()["default"]
                .persistent_dirs,
            expected
        );
    }

    for invalid in [
        minimal.replace("schema", "unknown"),
        format!("{minimal}unknown = true\n"),
        minimal.replace(
            "image = \"example.invalid/agent:v1\"",
            "image = \"example.invalid/agent:v1\"\nunknown = true",
        ),
        minimal.replace(
            "example.invalid/agent:v1",
            "https://example.invalid/agent:v1",
        ),
        minimal.replace("example.invalid/agent:v1", ""),
        minimal.replace("-v1", "-v2"),
    ] {
        assert!(parse_trusted_configuration(invalid.as_bytes()).is_err());
    }

    let duplicate = format!("{minimal}schema = \"lazaret-trusted-host-config-v1\"\n");
    assert!(parse_trusted_configuration(duplicate.as_bytes()).is_err());

    for invalid in [
        format!("{minimal}\n[storage]\nunknown = true\n"),
        format!("{minimal}\n[network]\nunknown = true\n"),
        r#"schema = "lazaret-trusted-host-config-v1"
[profiles.default]
image = "example.invalid/agent:v1"
volumes = [{ host = "/source", container = "/root/source", kind = "directory", unknown = true }]
"#
        .into(),
        format!("{minimal}\n[profiles.default.escalation]\nunknown = true\n"),
        format!(
            "{minimal}\n[profiles.default.escalation]\nenabled = true\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"/bin/true\"\nunknown = true\n"
        ),
        r#"schema = "lazaret-trusted-host-config-v1"
[profiles.default]
image = "example.invalid/agent:v1"
volumes = [{ host = "/source", container = "/root/source", kind = "socket" }]
"#
        .into(),
    ] {
        assert!(parse_trusted_configuration(invalid.as_bytes()).is_err());
    }
}

#[test]
fn runtime_dcache_defaults_accepts_budget_bounds_and_rejects_excess() {
    let minimal = r#"schema = "lazaret-trusted-host-config-v1"
[profiles.default]
image = "example.invalid/agent:v1"
"#;
    assert_eq!(
        parse_trusted_configuration(minimal.as_bytes())
            .unwrap()
            .runtime()
            .runsc_dcache,
        DEFAULT_RUNSC_DCACHE
    );
    for value in [0, MAX_RUNSC_DCACHE] {
        let explicit = minimal.replace(
            "[profiles.default]",
            &format!("[runtime]\nrunsc_dcache = {value}\n[profiles.default]"),
        );
        assert_eq!(
            parse_trusted_configuration(explicit.as_bytes())
                .unwrap()
                .runtime()
                .runsc_dcache,
            value
        );
    }
    let excessive = minimal.replace(
        "[profiles.default]",
        &format!(
            "[runtime]\nrunsc_dcache = {}\n[profiles.default]",
            MAX_RUNSC_DCACHE + 1
        ),
    );
    assert_eq!(
        parse_trusted_configuration(excessive.as_bytes())
            .unwrap_err()
            .kind(),
        ConfigurationErrorKind::InvalidRuntime
    );
}

#[test]
fn sandbox_layout_is_closed_normalized_and_requires_workspace() {
    assert!(SandboxLayoutV1::from_protected_destinations(["/proc".into()]).is_err());
    assert!(
        SandboxLayoutV1::from_protected_destinations(["/workspace".into(), "/workspace".into()])
            .is_err()
    );
    for invalid in ["workspace", "/", "/workspace/", "/workspace/../control"] {
        assert!(
            SandboxLayoutV1::from_protected_destinations(["/workspace".into(), invalid.into(),])
                .is_err()
        );
    }
    assert!(
        SandboxLayoutV1::from_destination_policy(["/workspace".into()], ["/workspace".into()])
            .is_err()
    );
}

#[test]
fn persistent_parents_allow_only_classified_transient_children() {
    let layout = SandboxLayoutV1::from_destination_policy(
        [
            "/workspace".into(),
            "/run/lazaret".into(),
            "/proc".into(),
            "/sys".into(),
            "/dev".into(),
        ],
        [
            "/etc/resolv.conf".into(),
            "/etc/hosts".into(),
            "/etc/hostname".into(),
        ],
    )
    .unwrap();
    let tree = TestTree::new();
    let body = valid_configuration(&tree).replace(
        "persistent_dirs = [\"/root\"]",
        "persistent_dirs = [\"/root\", \"/usr\", \"/var\", \"/etc\", \"/opt\"]",
    );
    let config = write_configuration(&tree, &body);
    let environment = BTreeMap::from([("HOST_TOKEN".into(), "value".into())]);
    let resolved =
        load_trusted_configuration(request_with_layout(&tree, config, environment, layout))
            .unwrap();
    assert_eq!(
        resolved.fingerprint_record().persistent_dirs,
        ["/root", "/usr", "/var", "/etc", "/opt"]
    );

    for persistent in ["/run", "/run/lazaret/state", "/etc/hosts"] {
        let case = TestTree::new();
        let body = valid_configuration(&case).replace(
            "persistent_dirs = [\"/root\"]",
            &format!("persistent_dirs = [\"{persistent}\"]"),
        );
        let config = write_configuration(&case, &body);
        let environment = BTreeMap::from([("HOST_TOKEN".into(), "value".into())]);
        let layout = SandboxLayoutV1::from_destination_policy(
            ["/workspace".into(), "/run/lazaret".into()],
            ["/etc/hosts".into()],
        )
        .unwrap();
        assert_eq!(
            load_trusted_configuration(request_with_layout(&case, config, environment, layout,))
                .unwrap_err()
                .kind(),
            ConfigurationErrorKind::PathConflict
        );
    }
}

#[test]
fn repository_example_loads_with_ipv4_normalization_and_private_denies() {
    let tree = TestTree::new();
    let config = write_configuration(&tree, include_str!("../../../docs/example.toml"));
    let resolved = load_trusted_configuration(request(&tree, config, BTreeMap::new())).unwrap();
    assert_eq!(resolved.selected_profile(), "default");
    assert_eq!(
        resolved.fingerprint_record().persistent_dirs,
        ["/root", "/usr", "/var", "/etc", "/opt"]
    );
    assert!(
        resolved
            .effective_allow_prefixes()
            .iter()
            .any(|prefix| prefix.address() == [192, 0, 2, 53] && prefix.prefix_length() == 32)
    );
    for (address, length) in [
        ([10, 0, 0, 0], 8),
        ([172, 16, 0, 0], 12),
        ([192, 168, 0, 0], 16),
    ] {
        assert!(
            resolved
                .effective_deny_prefixes()
                .iter()
                .any(|prefix| prefix.address() == address && prefix.prefix_length() == length)
        );
    }
}

#[test]
fn explicit_tilde_configuration_path_expands_only_against_home() {
    let tree = TestTree::new();
    let home = tree.path().join("home");
    fs::create_dir(&home).unwrap();
    fs::set_permissions(&home, fs::Permissions::from_mode(0o700)).unwrap();
    fs::write(home.join("trusted.toml"), valid_configuration(&tree)).unwrap();
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let resolved =
        load_trusted_configuration(request(&tree, PathBuf::from("~/trusted.toml"), environment))
            .unwrap();
    assert_eq!(resolved.selected_profile(), "default");
}

#[test]
fn nonselected_profiles_are_decoded_but_do_not_resolve_host_authority() {
    let tree = TestTree::new();
    let body = format!(
        "{}\n[profiles.other]\nimage = \"example.invalid/other:v1\"\nenv = {{ SECRET = \"env:UNSET\" }}\nvolumes = [{{ host = \"/does/not/exist\", container = \"/root/missing\", kind = \"directory\" }}]\n",
        valid_configuration(&tree)
    );
    let config = write_configuration(&tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    assert!(load_trusted_configuration(request(&tree, config, environment)).is_ok());
}

#[test]
fn nonselected_profiles_cannot_hide_invalid_approval_semantics() {
    for other_profile in [
        r#"[profiles.other]
image = "example.invalid/other:v1"
[[profiles.other.escalation.auto_approve]]
executable = "/bin/true"
"#,
        r#"[profiles.other]
image = "example.invalid/other:v1"
[profiles.other.escalation]
enabled = true
[[profiles.other.escalation.auto_approve]]
executable = "/bin/true"
allow_extra_args = true
"#,
    ] {
        let document = format!(
            "schema = \"lazaret-trusted-host-config-v1\"\n[profiles.default]\nimage = \"example.invalid/default:v1\"\n{other_profile}"
        );
        let error = parse_trusted_configuration(document.as_bytes()).unwrap_err();
        assert_eq!(error.kind(), ConfigurationErrorKind::InvalidAutoApproval);
    }
}

#[test]
fn profiles_cannot_claim_the_session_identity_environment_name() {
    let document = b"schema = \"lazaret-trusted-host-config-v1\"\n\
        [profiles.default]\n\
        image = \"example.invalid/default:v1\"\n\
        env = { LAZARET_SESSION_ID = \"env:HOST_SESSION_ID\" }\n";
    let error = parse_trusted_configuration(document).unwrap_err();
    assert_eq!(error.kind(), ConfigurationErrorKind::InvalidProfile);
}

#[test]
fn selected_profile_loads_into_confined_nonserializable_authority() {
    let tree = TestTree::new();
    let config = write_configuration(&tree, &valid_configuration(&tree));
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "top-secret".into());
    let resolved = load_trusted_configuration(request(&tree, config, environment)).unwrap();

    assert_eq!(resolved.selected_profile(), "default");
    assert!(
        resolved
            .effective_allow_prefixes()
            .iter()
            .any(|prefix| prefix.address() == [192, 0, 2, 0] && prefix.prefix_length() == 24)
    );
    assert!(
        resolved
            .effective_deny_prefixes()
            .iter()
            .any(|prefix| prefix.address() == [10, 0, 0, 0] && prefix.prefix_length() == 8)
    );
    assert_eq!(
        resolved.ephemeral_environment()["TOKEN"].expose().to_str(),
        Some("top-secret")
    );
    assert!(!format!("{resolved:?}").contains("top-secret"));
    assert_eq!(resolved.volumes().len(), 1);
    resolved.volumes()[0].open_source().unwrap();
    assert_eq!(
        fs::metadata(tree.path().join("data"))
            .unwrap()
            .permissions()
            .mode()
            & 0o777,
        0o700
    );
}

#[test]
fn environment_values_never_change_the_fingerprint() {
    let tree = TestTree::new();
    let config = write_configuration(&tree, &valid_configuration(&tree));
    let mut first = BTreeMap::new();
    first.insert("HOST_TOKEN".into(), "first-secret".into());
    let first = load_trusted_configuration(request(&tree, config.clone(), first)).unwrap();
    let mut second = BTreeMap::new();
    second.insert("HOST_TOKEN".into(), "second-secret".into());
    let second = load_trusted_configuration(request(&tree, config, second)).unwrap();
    assert_eq!(
        first.configuration_fingerprint(),
        second.configuration_fingerprint()
    );
}

#[test]
fn ignored_routing_is_explicit_and_fingerprinted() {
    let first_tree = TestTree::new();
    let first_config = write_configuration(&first_tree, &valid_configuration(&first_tree));
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let first =
        load_trusted_configuration(request(&first_tree, first_config, environment)).unwrap();
    assert!(first.fingerprint_record().isolate_gitignored);

    let second_tree = TestTree::new();
    let body = valid_configuration(&second_tree).replace(
        "image = \"example.invalid/agent:v1\"",
        "image = \"example.invalid/agent:v1\"\nisolate_gitignored = false",
    );
    let second_config = write_configuration(&second_tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let second =
        load_trusted_configuration(request(&second_tree, second_config, environment)).unwrap();
    assert!(!second.fingerprint_record().isolate_gitignored);
    let disabled = derive_configuration_fingerprint(second.fingerprint_record()).unwrap();
    let mut enabled_record = second.fingerprint_record().clone();
    enabled_record.isolate_gitignored = true;
    assert_ne!(
        disabled,
        derive_configuration_fingerprint(&enabled_record).unwrap()
    );
}

#[test]
fn retained_ancestor_authority_survives_path_replacement() {
    let tree = TestTree::new();
    let config = write_configuration(&tree, &valid_configuration(&tree));
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let resolved = load_trusted_configuration(request(&tree, config, environment)).unwrap();
    let original_source = tree.path().join("data/profiles/default/agent-state");
    let original_inode = fs::metadata(&original_source).unwrap().ino();
    let profile = tree.path().join("data/profiles/default");
    let displaced = tree.path().join("data/profiles/displaced");
    fs::rename(&profile, &displaced).unwrap();
    fs::create_dir(&profile).unwrap();
    fs::set_permissions(&profile, fs::Permissions::from_mode(0o700)).unwrap();
    fs::create_dir(profile.join("agent-state")).unwrap();
    let replacement_inode = fs::metadata(profile.join("agent-state")).unwrap().ino();

    let opened = resolved.volumes()[0].open_source().unwrap();
    let opened_inode = rustix::fs::fstat(&opened).unwrap().st_ino;
    assert_eq!(opened_inode, original_inode);
    assert_ne!(opened_inode, replacement_inode);
}

#[test]
fn consumer_api_is_descriptor_relative_and_refuses_final_identity_drift() {
    let tree = TestTree::new();
    let config = write_configuration(&tree, &valid_configuration(&tree));
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let load_request = request(&tree, config, environment);
    let nested = load_request.workspace.join("nested");
    fs::create_dir(&nested).unwrap();
    fs::write(nested.join("data"), b"validated").unwrap();
    symlink("data", nested.join("alias")).unwrap();
    let expected_inode = fs::metadata(nested.join("data")).unwrap().ino();
    let resolved = load_trusted_configuration(load_request).unwrap();

    let opened = resolved
        .workspace()
        .open_beneath(Path::new("nested/data"), ConfinedPathType::RegularFile)
        .unwrap();
    assert_eq!(rustix::fs::fstat(&opened).unwrap().st_ino, expected_inode);
    for refused in ["../outside", "/absolute", "nested/./data", "nested/alias"] {
        assert!(
            resolved
                .workspace()
                .open_beneath(Path::new(refused), ConfinedPathType::RegularFile)
                .is_err(),
            "{refused} must not escape or redirect authority"
        );
    }

    let workspace = tree.path().join("workspace");
    fs::rename(&workspace, tree.path().join("displaced-workspace")).unwrap();
    fs::create_dir(&workspace).unwrap();
    assert!(resolved.workspace().open_authority().is_err());

    let source = tree.path().join("data/profiles/default/agent-state");
    fs::rename(&source, tree.path().join("displaced-agent-state")).unwrap();
    fs::create_dir(&source).unwrap();
    assert!(resolved.volumes()[0].open_source().is_err());
}

#[test]
fn auto_approval_uses_only_the_canonical_direct_vector_and_safe_object() {
    let tree = TestTree::new();
    let binary_directory = tree.path().join("bin");
    fs::create_dir(&binary_directory).unwrap();
    let executable = binary_directory.join("tool");
    fs::write(&executable, b"#!/bin/sh\nexit 0\n").unwrap();
    fs::set_permissions(&executable, fs::Permissions::from_mode(0o700)).unwrap();
    let body = valid_configuration(&tree).replace(
        "[profiles.default.escalation]\nenabled = false",
        &format!(
            "[profiles.default.escalation]\nenabled = true\n\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"{}\"\nargs = [\"fixed\"]\nallow_extra_args = false",
            executable.display()
        ),
    );
    let config = write_configuration(&tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let resolved = load_trusted_configuration(request(&tree, config, environment)).unwrap();
    let rule = &resolved.auto_approval_rules()[0];
    let canonical = fs::canonicalize(&executable)
        .unwrap()
        .to_str()
        .unwrap()
        .as_bytes()
        .to_vec();
    assert!(rule.matches_command_argv(&[canonical.clone(), b"fixed".to_vec()]));
    assert!(!rule.matches_command_argv(&[b"tool".to_vec(), b"fixed".to_vec()]));
    assert!(!rule.matches_command_argv(std::slice::from_ref(&canonical)));
    assert!(
        !rule.matches_command_argv(&[canonical.clone(), b"fixed".to_vec(), b"extra".to_vec(),])
    );
    assert!(!rule.matches_command_argv(&[canonical, b"fixed\0extra".to_vec()]));

    let prefix_tree = TestTree::new();
    let binary_directory = prefix_tree.path().join("bin");
    fs::create_dir(&binary_directory).unwrap();
    let executable = binary_directory.join("tool");
    fs::write(&executable, b"#!/bin/sh\nexit 0\n").unwrap();
    fs::set_permissions(&executable, fs::Permissions::from_mode(0o700)).unwrap();
    let body = valid_configuration(&prefix_tree).replace(
        "[profiles.default.escalation]\nenabled = false",
        &format!(
            "[profiles.default.escalation]\nenabled = true\n\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"{}\"\nargs = [\"fixed\"]\nallow_extra_args = true",
            executable.display()
        ),
    );
    let config = write_configuration(&prefix_tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    let resolved = load_trusted_configuration(request(&prefix_tree, config, environment)).unwrap();
    let canonical = fs::canonicalize(executable)
        .unwrap()
        .to_str()
        .unwrap()
        .as_bytes()
        .to_vec();
    let rule = &resolved.auto_approval_rules()[0];
    assert!(rule.matches_command_argv(&[canonical.clone(), b"fixed".to_vec()]));
    assert!(rule.matches_command_argv(&[canonical, b"fixed".to_vec(), b"extra".to_vec(),]));

    let hardlink_tree = TestTree::new();
    let binary_directory = hardlink_tree.path().join("bin");
    fs::create_dir(&binary_directory).unwrap();
    let executable = binary_directory.join("tool");
    fs::write(&executable, b"#!/bin/sh\nexit 0\n").unwrap();
    fs::set_permissions(&executable, fs::Permissions::from_mode(0o700)).unwrap();
    fs::hard_link(&executable, binary_directory.join("alias")).unwrap();
    let body = valid_configuration(&hardlink_tree).replace(
        "[profiles.default.escalation]\nenabled = false",
        &format!(
            "[profiles.default.escalation]\nenabled = true\n\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"{}\"",
            executable.display()
        ),
    );
    let config = write_configuration(&hardlink_tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    assert_eq!(
        load_trusted_configuration(request(&hardlink_tree, config, environment))
            .unwrap_err()
            .kind(),
        ConfigurationErrorKind::InvalidAutoApproval
    );
}

#[test]
fn path_network_environment_and_volume_conflicts_refuse_loading() {
    let tree = TestTree::new();
    let base = valid_configuration(&tree);
    let cases = [
        (
            base.replace(
                "persistent_dirs = [\"/root\"]",
                "persistent_dirs = [\"/workspace/cache\"]",
            ),
            ConfigurationErrorKind::PathConflict,
        ),
        (
            base.replace(
                "allow_egress = [\"10.1.2.3/24\"]",
                "allow_egress = [\"10.0.0.0/8\"]",
            ),
            ConfigurationErrorKind::InvalidNetwork,
        ),
        (
            base.replace(
                "allow_egress = [\"10.1.2.3/24\"]",
                "allow_egress = [\"10.137.55.2/32\"]",
            ),
            ConfigurationErrorKind::InvalidNetwork,
        ),
        (
            base.replace(
                "allow_egress = [\"10.1.2.3/24\"]",
                "allow_egress = [\"10.1.2.3/24\"]\ndeny_egress = [\"10.137.54.3/32\"]",
            ),
            ConfigurationErrorKind::InvalidNetwork,
        ),
        (
            base.replace("/root/.local/state/agent", "/root"),
            ConfigurationErrorKind::InvalidVolume,
        ),
        (
            base.replace(
                "persistent_dirs = [\"/root\"]",
                "persistent_dirs = [\"/root\", \"/root/cache\"]",
            ),
            ConfigurationErrorKind::InvalidProfile,
        ),
        (
            base.replace("kind = \"directory\"", "kind = \"file\""),
            ConfigurationErrorKind::InvalidVolume,
        ),
        (
            format!(
                "{base}\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"/bin/true\"\n"
            ),
            ConfigurationErrorKind::InvalidAutoApproval,
        ),
        (
            base.replace(
                "[profiles.default.escalation]\nenabled = false",
                "[profiles.default.escalation]\nenabled = true\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"/bin/true\"\nallow_extra_args = true",
            ),
            ConfigurationErrorKind::InvalidAutoApproval,
        ),
    ];
    for (index, (body, expected)) in cases.into_iter().enumerate() {
        let case_tree = TestTree::new();
        let body = body.replace(
            &tree.path().join("data").display().to_string(),
            &case_tree.path().join("data").display().to_string(),
        );
        let config = write_configuration(&case_tree, &body);
        let mut environment = BTreeMap::new();
        environment.insert("HOST_TOKEN".into(), "value".into());
        let error = load_trusted_configuration(request(&case_tree, config, environment))
            .expect_err(&format!("case {index} must fail"));
        assert_eq!(error.kind(), expected);
    }

    let config = write_configuration(&tree, &base);
    let error = load_trusted_configuration(request(&tree, config, BTreeMap::new())).unwrap_err();
    assert_eq!(error.kind(), ConfigurationErrorKind::MissingEnvironment);
}

#[test]
fn broad_private_deny_can_contain_the_reserved_topology() {
    let tree = TestTree::new();
    let body = valid_configuration(&tree).replace(
        "default_allow = [\"192.0.2.4/24\", \"198.51.100.53/32\"]",
        "default_allow = [\"192.0.2.4/24\", \"198.51.100.53/32\"]\ndefault_deny = [\"10.0.0.0/8\"]",
    );
    let config = write_configuration(&tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    load_trusted_configuration(request(&tree, config, environment)).unwrap();
}

#[test]
fn secret_environment_resolution_occurs_after_authority_validation() {
    let volume_tree = TestTree::new();
    let body = valid_configuration(&volume_tree).replace("kind = \"directory\"", "kind = \"file\"");
    let config = write_configuration(&volume_tree, &body);
    assert_eq!(
        load_trusted_configuration(request(&volume_tree, config, BTreeMap::new()))
            .unwrap_err()
            .kind(),
        ConfigurationErrorKind::InvalidVolume
    );

    let executable_tree = TestTree::new();
    let executable = executable_tree.path().join("unsafe-tool");
    fs::write(&executable, b"#!/bin/sh\nexit 0\n").unwrap();
    fs::set_permissions(&executable, fs::Permissions::from_mode(0o722)).unwrap();
    let body = valid_configuration(&executable_tree).replace(
        "[profiles.default.escalation]\nenabled = false",
        &format!(
            "[profiles.default.escalation]\nenabled = true\n[[profiles.default.escalation.auto_approve]]\nexecutable = \"{}\"",
            executable.display()
        ),
    );
    let config = write_configuration(&executable_tree, &body);
    assert_eq!(
        load_trusted_configuration(request(&executable_tree, config, BTreeMap::new()))
            .unwrap_err()
            .kind(),
        ConfigurationErrorKind::InvalidAutoApproval
    );
}

#[test]
fn volume_symlinks_and_lazaret_owned_mode_drift_are_rejected() {
    let tree = TestTree::new();
    let target = tree.path().join("target");
    fs::create_dir(&target).unwrap();
    let link = tree.path().join("volume-link");
    symlink(&target, &link).unwrap();
    let body = valid_configuration(&tree)
        .replace("{profile_dir}/agent-state", link.to_str().unwrap())
        .replace("create = true", "create = false");
    let config = write_configuration(&tree, &body);
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    assert_eq!(
        load_trusted_configuration(request(&tree, config, environment))
            .unwrap_err()
            .kind(),
        ConfigurationErrorKind::InvalidVolume
    );

    let mode_tree = TestTree::new();
    let data = mode_tree.path().join("data");
    fs::create_dir(&data).unwrap();
    fs::set_permissions(&data, fs::Permissions::from_mode(0o755)).unwrap();
    let config = write_configuration(&mode_tree, &valid_configuration(&mode_tree));
    let mut environment = BTreeMap::new();
    environment.insert("HOST_TOKEN".into(), "value".into());
    assert_eq!(
        load_trusted_configuration(request(&mode_tree, config, environment))
            .unwrap_err()
            .kind(),
        ConfigurationErrorKind::InvalidPath
    );
}

#[test]
fn concurrent_loaders_share_exact_owned_directory_creation() {
    let tree = TestTree::new();
    let config = write_configuration(&tree, &valid_configuration(&tree));
    let barrier = Arc::new(Barrier::new(8));
    std::thread::scope(|scope| {
        let handles = (0..8)
            .map(|_| {
                let barrier = Arc::clone(&barrier);
                let config = config.clone();
                let tree = &tree;
                scope.spawn(move || {
                    let mut environment = BTreeMap::new();
                    environment.insert("HOST_TOKEN".into(), "value".into());
                    barrier.wait();
                    load_trusted_configuration(request(tree, config, environment))
                })
            })
            .collect::<Vec<_>>();
        for handle in handles {
            handle.join().unwrap().unwrap();
        }
    });
}

#[test]
fn configuration_source_permissions_links_and_size_are_bounded() {
    for mutation in 0..3 {
        let tree = TestTree::new();
        let config = write_configuration(&tree, &valid_configuration(&tree));
        match mutation {
            0 => fs::set_permissions(&config, fs::Permissions::from_mode(0o666)).unwrap(),
            1 => fs::hard_link(&config, tree.path().join("config-link")).unwrap(),
            2 => fs::write(&config, vec![b'x'; 1_048_577]).unwrap(),
            _ => unreachable!(),
        }
        let mut environment = BTreeMap::new();
        environment.insert("HOST_TOKEN".into(), "value".into());
        assert!(
            load_trusted_configuration(request(&tree, config, environment)).is_err(),
            "mutation {mutation} must fail"
        );
    }
}

#[test]
fn digest_vectors_are_framed_and_order_independent() {
    assert_eq!(
        derive_domain_id("default", b"/workspace/project")
            .unwrap()
            .as_bytes(),
        &[
            0x62, 0x64, 0xea, 0x6c, 0x25, 0x85, 0x2f, 0x5b, 0x77, 0x03, 0x90, 0x33, 0x9b, 0xb1,
            0xd9, 0x75, 0x01, 0x9b, 0x70, 0xa6, 0x04, 0x55, 0xff, 0xfa, 0x2a, 0x1c, 0xf3, 0x0e,
            0xf1, 0xc6, 0xbe, 0xf9,
        ]
    );

    let mut record = ConfigurationFingerprintRecordV1 {
        selected_profile: "default".into(),
        storage_root: HostPath::new(b"/data".to_vec()),
        runtime_root: HostPath::new(b"/run/user/1000/lazaret".to_vec()),
        runsc_dcache: DEFAULT_RUNSC_DCACHE,
        image: "example.invalid/agent:v1".into(),
        isolate_gitignored: true,
        persistent_dirs: vec!["/var".into(), "/root".into()],
        environment_references: vec![
            EnvironmentReference {
                sandbox_name: "B".into(),
                host_name: "HOST_B".into(),
            },
            EnvironmentReference {
                sandbox_name: "A".into(),
                host_name: "HOST_A".into(),
            },
        ],
        volumes: vec![ResolvedVolume {
            canonical_host_source: HostPath::new(b"/source".to_vec()),
            container_path: "/root/source".into(),
            kind: VolumeKind::Directory,
            access: VolumeAccess::ReadOnly,
            create: false,
        }],
        effective_allow_prefixes: vec![([8, 8, 8, 8], 32), ([1, 1, 1, 1], 32)],
        effective_deny_prefixes: vec![([10, 0, 0, 0], 8)],
        escalation_enabled: true,
        auto_approval_rules: vec![ResolvedAutoApprovalRule {
            canonical_executable: HostPath::new(b"/usr/bin/true".to_vec()),
            args: vec!["a".into(), "b".into()],
            allow_extra_args: false,
        }],
    };
    let first = derive_configuration_fingerprint(&record).unwrap();
    assert_eq!(
        first.as_bytes(),
        &[
            0x5f, 0x1d, 0xeb, 0x46, 0xa4, 0xb5, 0x90, 0xc3, 0x47, 0x0b, 0xa0, 0xdf, 0xd6, 0x6e,
            0x9d, 0x91, 0xdb, 0xf3, 0x75, 0xf6, 0xbe, 0x50, 0x9a, 0x8d, 0xba, 0x4a, 0x3d, 0xae,
            0xf3, 0x05, 0x97, 0x56,
        ]
    );
    record.persistent_dirs.reverse();
    record.environment_references.reverse();
    record.effective_allow_prefixes.reverse();
    assert_eq!(first, derive_configuration_fingerprint(&record).unwrap());
    record.auto_approval_rules[0].args.reverse();
    assert_ne!(first, derive_configuration_fingerprint(&record).unwrap());
}

#[test]
fn serialized_configuration_records_use_strict_postcard() {
    let reference = EnvironmentReference {
        sandbox_name: "TOKEN".into(),
        host_name: "HOST_TOKEN".into(),
    };
    let mut encoded = encode(&reference).unwrap();
    encoded.push(0);
    assert!(matches!(
        decode::<EnvironmentReference>(&encoded),
        Err(CodecError::TrailingPayload)
    ));
}