diff options
Diffstat (limited to 'nixpkgs/pkgs/os-specific/linux/kernel/hardened')
5 files changed, 720 insertions, 0 deletions
diff --git a/nixpkgs/pkgs/os-specific/linux/kernel/hardened/anthraxx.asc b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/anthraxx.asc new file mode 100644 index 00000000000..101ccfbf0f2 --- /dev/null +++ b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/anthraxx.asc @@ -0,0 +1,325 @@ +-----BEGIN PGP PUBLIC KEY BLOCK----- +Version: GnuPG v2 + +mQINBE64OEUBEADPS1v+zoCdKA6zyfUtVIaBoIwMhCibqurXi30tVoC9LgM6W1ve +HwPFukWq7DAS0mZUPE3mSV63JFLaTy0bY/6GO1D4wLdWZx4ppH7XKNCvKCbsi70k +UozFykNVf+83WEskuF1oYzXlF3aB5suz2IWJl7ey1EXgIpehwQaTJUA5JIWYFp9A +566LRNJefYMzUR33xc4dRKj6Etg0xdLVq7/vZoo8HpLCBGNWiP0AKqFWEwTg0xQL +7nsJA5tfJJdwAJvrzjpFsvb63PKG6waAtdHhON4q7E2Udak9fz2tRjxA5l9l2zXk +aqsysUzkxPhNjwMENoQ04KZg4aT+ZhhBzTowSWLp3KV2uaZ66kdPUO3s+/1bPp5/ +N/IlykaUwyL773iYOZ5dOY/9hIuX/zssihcrGEMW6yIyZR5uKhzYdaM9ExTXP637 +UccgNS9/pskPGPx/xK23NDCfeHzL9YHS5KokA2wb/b9hqpwvLaeblbMl2pt79F1R +ac+rZlrRyX3NvlTQP4hqM9Ei2YBAU7QFDJEjH8pVIceL7grxi1Ju1iD5QiSK+je5 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+# Based on recommendations from: +# http://kernsec.org/wiki/index.php/Kernel_Self_Protection_Project#Recommended_settings +# https://wiki.gentoo.org/wiki/Hardened/Hardened_Kernel_Project +# +# Dangerous features that can be permanently (for the boot session) disabled at +# boot via sysctl or kernel cmdline are left enabled here, for improved +# flexibility. +# +# See also <nixos/modules/profiles/hardened.nix> + +{ stdenv, version }: + +with stdenv.lib; +with stdenv.lib.kernel; +with (stdenv.lib.kernel.whenHelpers version); + +assert (versionAtLeast version "4.9"); + +{ + # Report BUG() conditions and kill the offending process. + BUG = yes; + + # Safer page access permissions (wrt. code injection). Default on >=4.11. + DEBUG_RODATA = whenOlder "4.11" yes; + DEBUG_SET_MODULE_RONX = whenOlder "4.11" yes; + + # Mark LSM hooks read-only after init. SECURITY_WRITABLE_HOOKS n + # conflicts with SECURITY_SELINUX_DISABLE y; disabling the latter + # implicitly marks LSM hooks read-only after init. + # + # SELinux can only be disabled at boot via selinux=0 + # + # We set SECURITY_WRITABLE_HOOKS n primarily for documentation purposes; the + # config builder fails to detect that it has indeed been unset. + SECURITY_SELINUX_DISABLE = whenAtLeast "4.12" no; + SECURITY_WRITABLE_HOOKS = whenAtLeast "4.12" (option no); + + STRICT_KERNEL_RWX = whenAtLeast "4.11" yes; + + # Perform additional validation of commonly targeted structures. + DEBUG_CREDENTIALS = yes; + DEBUG_NOTIFIERS = yes; + DEBUG_PI_LIST = yes; # doesn't BUG() + DEBUG_SG = yes; + SCHED_STACK_END_CHECK = yes; + + REFCOUNT_FULL = whenAtLeast "4.13" yes; + + # Randomize page allocator when page_alloc.shuffle=1 + SHUFFLE_PAGE_ALLOCATOR = whenAtLeast "5.2" yes; + + # Allow enabling slub/slab free poisoning with slub_debug=P + SLUB_DEBUG = yes; + + # Wipe higher-level memory allocations on free() with page_poison=1 + PAGE_POISONING = yes; + PAGE_POISONING_NO_SANITY = yes; + PAGE_POISONING_ZERO = yes; + + # Enable the SafeSetId LSM + SECURITY_SAFESETID = whenAtLeast "5.1" yes; + + # Reboot devices immediately if kernel experiences an Oops. + PANIC_TIMEOUT = freeform "-1"; + + GCC_PLUGINS = yes; # Enable gcc plugin options + # Gather additional entropy at boot time for systems that may = no;ot have appropriate entropy sources. + GCC_PLUGIN_LATENT_ENTROPY = yes; + + GCC_PLUGIN_STRUCTLEAK = whenAtLeast "4.11" yes; # A port of the PaX structleak plugin + GCC_PLUGIN_STRUCTLEAK_BYREF_ALL = whenAtLeast "4.14" yes; # Also cover structs passed by address + GCC_PLUGIN_STACKLEAK = whenAtLeast "4.20" yes; # A port of the PaX stackleak plugin + GCC_PLUGIN_RANDSTRUCT = whenAtLeast "4.13" yes; # A port of the PaX randstruct plugin + GCC_PLUGIN_RANDSTRUCT_PERFORMANCE = whenAtLeast "4.13" yes; + + # Disable various dangerous settings + ACPI_CUSTOM_METHOD = no; # Allows writing directly to physical memory + PROC_KCORE = no; # Exposes kernel text image layout + INET_DIAG = no; # Has been used for heap based attacks in the past + + # Use -fstack-protector-strong (gcc 4.9+) for best stack canary coverage. + CC_STACKPROTECTOR_REGULAR = whenOlder "4.18" no; + CC_STACKPROTECTOR_STRONG = whenOlder "4.18" yes; + +} diff --git a/nixpkgs/pkgs/os-specific/linux/kernel/hardened/patches.json b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/patches.json new file mode 100644 index 00000000000..19517fd9ea3 --- /dev/null +++ b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/patches.json @@ -0,0 +1,27 @@ +{ + "4.14": { + "name": "linux-hardened-4.14.180.a.patch", + "sha256": "0rpk5lq947i4v48d6jv75rgwpncayr4agc3f2iich3hlkh5p72p3", + "url": "https://github.com/anthraxx/linux-hardened/releases/download/4.14.180.a/linux-hardened-4.14.180.a.patch" + }, + "4.19": { + "name": "linux-hardened-4.19.123.a.patch", + "sha256": "12z4f0nph23110dpk0c8av9bjr8q9qhmyzzj2chrscfwybmld76h", + "url": "https://github.com/anthraxx/linux-hardened/releases/download/4.19.123.a/linux-hardened-4.19.123.a.patch" + }, + "5.4": { + "name": "linux-hardened-5.4.41.a.patch", + "sha256": "0rbp0radqcs2bqapp9k0hvafxn3wlzkc50wnw1145w76mkvpc91y", + "url": "https://github.com/anthraxx/linux-hardened/releases/download/5.4.41.a/linux-hardened-5.4.41.a.patch" + }, + "5.5": { + "name": "linux-hardened-5.5.19.a.patch", + "sha256": "1ya5nsfhr3nwz6qiz4pdhvm6k9mx1kr0prhdvhx3p40f1vk281sc", + "url": "https://github.com/anthraxx/linux-hardened/releases/download/5.5.19.a/linux-hardened-5.5.19.a.patch" + }, + "5.6": { + "name": "linux-hardened-5.6.13.a.patch", + "sha256": "1z1f15h0wpajkiaqagnx8r25vmabkpc69rzn2h0p3k6z72l6iri5", + "url": "https://github.com/anthraxx/linux-hardened/releases/download/5.6.13.a/linux-hardened-5.6.13.a.patch" + } +} diff --git a/nixpkgs/pkgs/os-specific/linux/kernel/hardened/tag-hardened.patch b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/tag-hardened.patch new file mode 100644 index 00000000000..ff8a3a12797 --- /dev/null +++ b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/tag-hardened.patch @@ -0,0 +1,7 @@ +diff --git a/localversion-hardened b/localversion-hardened +new file mode 100644 +index 0000000000..e578045860 +--- /dev/null ++++ b/localversion-hardened +@@ -0,0 +1 @@ ++-hardened diff --git a/nixpkgs/pkgs/os-specific/linux/kernel/hardened/update.py b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/update.py new file mode 100755 index 00000000000..d6443d2e751 --- /dev/null +++ b/nixpkgs/pkgs/os-specific/linux/kernel/hardened/update.py @@ -0,0 +1,276 @@ +#! /usr/bin/env nix-shell +#! nix-shell -i python -p "python38.withPackages (ps: [ps.PyGithub])" git gnupg + +# This is automatically called by ../update.sh. + +from __future__ import annotations + +import json +import os +import re +import subprocess +import sys +from dataclasses import dataclass +from pathlib import Path +from tempfile import TemporaryDirectory +from typing import ( + Dict, + Iterator, + List, + Optional, + Sequence, + Tuple, + TypedDict, + Union, +) + +from github import Github +from github.GitRelease import GitRelease + +VersionComponent = Union[int, str] +Version = List[VersionComponent] + + +Patch = TypedDict("Patch", {"name": str, "url": str, "sha256": str}) + + +@dataclass +class ReleaseInfo: + version: Version + release: GitRelease + + +HERE = Path(__file__).resolve().parent +NIXPKGS_KERNEL_PATH = HERE.parent +NIXPKGS_PATH = HERE.parents[4] +HARDENED_GITHUB_REPO = "anthraxx/linux-hardened" +HARDENED_TRUSTED_KEY = HERE / "anthraxx.asc" +HARDENED_PATCHES_PATH = HERE / "patches.json" +MIN_KERNEL_VERSION: Version = [4, 14] + + +def run(*args: Union[str, Path]) -> subprocess.CompletedProcess[bytes]: + try: + return subprocess.run( + args, + check=True, + stdout=subprocess.PIPE, + stderr=subprocess.PIPE, + encoding="utf-8", + ) + except subprocess.CalledProcessError as err: + print( + f"error: `{err.cmd}` failed unexpectedly\n" + f"status code: {err.returncode}\n" + f"stdout:\n{err.stdout.strip()}\n" + f"stderr:\n{err.stderr.strip()}", + file=sys.stderr, + ) + sys.exit(1) + + +def nix_prefetch_url(url: str) -> Tuple[str, Path]: + output = run("nix-prefetch-url", "--print-path", url).stdout + sha256, path = output.strip().split("\n") + return sha256, Path(path) + + +def verify_openpgp_signature( + *, name: str, trusted_key: Path, sig_path: Path, data_path: Path, +) -> bool: + with TemporaryDirectory(suffix=".nixpkgs-gnupg-home") as gnupg_home_str: + gnupg_home = Path(gnupg_home_str) + run("gpg", "--homedir", gnupg_home, "--import", trusted_key) + keyring = gnupg_home / "pubring.kbx" + try: + subprocess.run( + ("gpgv", "--keyring", keyring, sig_path, data_path), + check=True, + stderr=subprocess.PIPE, + encoding="utf-8", + ) + return True + except subprocess.CalledProcessError as err: + print( + f"error: signature for {name} failed to verify!", + file=sys.stderr, + ) + print(err.stderr, file=sys.stderr, end="") + return False + + +def fetch_patch(*, name: str, release: GitRelease) -> Optional[Patch]: + def find_asset(filename: str) -> str: + try: + it: Iterator[str] = ( + asset.browser_download_url + for asset in release.get_assets() + if asset.name == filename + ) + return next(it) + except StopIteration: + raise KeyError(filename) + + patch_filename = f"{name}.patch" + try: + patch_url = find_asset(patch_filename) + sig_url = find_asset(patch_filename + ".sig") + except KeyError: + print(f"error: {patch_filename}{{,.sig}} not present", file=sys.stderr) + return None + + sha256, patch_path = nix_prefetch_url(patch_url) + _, sig_path = nix_prefetch_url(sig_url) + sig_ok = verify_openpgp_signature( + name=name, + trusted_key=HARDENED_TRUSTED_KEY, + sig_path=sig_path, + data_path=patch_path, + ) + if not sig_ok: + return None + + return Patch(name=patch_filename, url=patch_url, sha256=sha256) + + +def parse_version(version_str: str) -> Version: + version: Version = [] + for component in version_str.split("."): + try: + version.append(int(component)) + except ValueError: + version.append(component) + return version + + +def version_string(version: Version) -> str: + return ".".join(str(component) for component in version) + + +def major_kernel_version_key(kernel_version: Version) -> str: + return version_string(kernel_version[:-1]) + + +def commit_patches(*, kernel_key: str, message: str) -> None: + new_patches_path = HARDENED_PATCHES_PATH.with_suffix(".new") + with open(new_patches_path, "w") as new_patches_file: + json.dump(patches, new_patches_file, indent=4, sort_keys=True) + new_patches_file.write("\n") + os.rename(new_patches_path, HARDENED_PATCHES_PATH) + message = f"linux/hardened/patches/{kernel_key}: {message}" + print(message) + if os.environ.get("COMMIT"): + run( + "git", + "-C", + NIXPKGS_PATH, + "commit", + f"--message={message}", + HARDENED_PATCHES_PATH, + ) + + +# Load the existing patches. +patches: Dict[str, Patch] +with open(HARDENED_PATCHES_PATH) as patches_file: + patches = json.load(patches_file) + +# Get the set of currently packaged kernel versions. +kernel_versions = {} +for filename in os.listdir(NIXPKGS_KERNEL_PATH): + filename_match = re.fullmatch(r"linux-(\d+)\.(\d+)\.nix", filename) + if filename_match: + nix_version_expr = f""" + with import {NIXPKGS_PATH} {{}}; + (callPackage {NIXPKGS_KERNEL_PATH / filename} {{}}).version + """ + kernel_version_json = run( + "nix-instantiate", "--eval", "--json", "--expr", nix_version_expr, + ).stdout + kernel_version = parse_version(json.loads(kernel_version_json)) + if kernel_version < MIN_KERNEL_VERSION: + continue + kernel_key = major_kernel_version_key(kernel_version) + kernel_versions[kernel_key] = kernel_version + +# Remove patches for unpackaged kernel versions. +for kernel_key in sorted(patches.keys() - kernel_versions.keys()): + commit_patches(kernel_key=kernel_key, message="remove") + +g = Github(os.environ.get("GITHUB_TOKEN")) +repo = g.get_repo(HARDENED_GITHUB_REPO) +failures = False + +# Match each kernel version with the best patch version. +releases = {} +for release in repo.get_releases(): + version = parse_version(release.tag_name) + # needs to look like e.g. 5.6.3.a + if len(version) < 4: + continue + + kernel_version = version[:-1] + kernel_key = major_kernel_version_key(kernel_version) + try: + packaged_kernel_version = kernel_versions[kernel_key] + except KeyError: + continue + + release_info = ReleaseInfo(version=version, release=release) + + if kernel_version == packaged_kernel_version: + releases[kernel_key] = release_info + else: + # Fall back to the latest patch for this major kernel version, + # skipping patches for kernels newer than the packaged one. + if kernel_version > packaged_kernel_version: + continue + elif ( + kernel_key not in releases or releases[kernel_key].version < version + ): + releases[kernel_key] = release_info + +# Update hardened-patches.json for each release. +for kernel_key in sorted(releases.keys()): + release_info = releases[kernel_key] + release = release_info.release + version = release_info.version + version_str = release.tag_name + name = f"linux-hardened-{version_str}" + + old_version: Optional[Version] = None + old_version_str: Optional[str] = None + update: bool + try: + old_filename = patches[kernel_key]["name"] + old_version_str = old_filename.replace("linux-hardened-", "").replace( + ".patch", "" + ) + old_version = parse_version(old_version_str) + update = old_version < version + except KeyError: + update = True + + if update: + patch = fetch_patch(name=name, release=release) + if patch is None: + failures = True + else: + patches[kernel_key] = patch + if old_version: + message = f"{old_version_str} -> {version_str}" + else: + message = f"init at {version_str}" + commit_patches(kernel_key=kernel_key, message=message) + +missing_kernel_versions = kernel_versions.keys() - patches.keys() + +if missing_kernel_versions: + print( + f"warning: no patches for kernel versions " + + ", ".join(missing_kernel_versions), + file=sys.stderr, + ) + +if failures: + sys.exit(1) |