mirror of
https://github.com/affaan-m/ECC.git
synced 2026-09-29 13:05:18 +02:00
affaan-m
ec0753bc7f
Preserve contributor history while applying the exact reviewed current-main repair.
Source-PR: https://github.com/affaan-m/ECC/pull/2965
Source-Parent: de480c65fd
Review-Manifest-SHA256: 53ead3eb859a4c6c13d6751b1fe4f9a94f1a5d35a37430f6b8524c50e903490b
540 lines
21 KiB
JavaScript
540 lines
21 KiB
JavaScript
#!/usr/bin/env node
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/**
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* PreToolUse Hook: Block --no-verify flag
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*
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* Blocks git hook-bypass flags (--no-verify, -c core.hooksPath=) to protect
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* pre-commit, commit-msg, and pre-push hooks from being skipped by AI agents.
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*
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* Replaces the previous npx-based invocation that failed in pnpm-only projects
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* (EBADDEVENGINES) and could not be disabled via ECC_DISABLED_HOOKS.
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*
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* Exit codes:
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* 0 = allow (not a git command or no bypass flags)
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* 2 = block (bypass flag detected)
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*/
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'use strict';
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const { createBudget, scanShell } = require('./lib/shell-scan');
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const MAX_STDIN = 1024 * 1024;
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let raw = '';
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// Git config section and variable names are case-insensitive
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// (subsection names are case-sensitive but core.hooksPath has none),
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// so we normalize the candidate token to lowercase before matching.
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// See https://git-scm.com/docs/git-config — "The variable names are
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// case-insensitive."
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const GIT_CONFIG_KEY_PREFIX = 'core.hookspath=';
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const COMMIT_OPTIONS_WITH_VALUE = new Set([
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'-m',
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'--message',
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'-F',
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'--file',
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'-C',
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'--reuse-message',
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'-c',
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'--reedit-message',
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'--author',
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'--date',
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'--template',
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'--fixup',
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'--squash',
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'--pathspec-from-file'
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]);
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const COMMIT_OPTIONS_WITH_INLINE_VALUE = ['--message=', '--file=', '--reuse-message=', '--reedit-message=', '--author=', '--date=', '--template=', '--fixup=', '--squash=', '--pathspec-from-file='];
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// Short options that take a value. When seen as part of a combined
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// short-option token (e.g. -tn), git's parser treats the rest of the
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// token as the option's value (template path 'n' here), so the scanner
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// must stop at this character — anything after it is the inline value,
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// not another flag.
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const COMMIT_SHORT_OPTIONS_WITH_VALUE = new Set(['m', 'F', 'C', 'c', 't']);
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// Short options whose value is OPTIONAL and must be stuck to the flag
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// (`-uno`, `-S<keyid>`). The rest of the cluster is that value, so an `n`
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// after them is not the -n flag: `git commit -uno` means --untracked-files=no.
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const COMMIT_SHORT_OPTIONS_WITH_OPTIONAL_VALUE = new Set(['u', 'S']);
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/**
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* Return true when a commit option consumes the following token as its value.
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*
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* @param {string} value
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* @returns {boolean}
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*/
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function commitOptionConsumesNextValue(value) {
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if (isCommitNoVerifyShortFlag(value)) {
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return false;
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}
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if (COMMIT_OPTIONS_WITH_VALUE.has(value)) {
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return true;
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}
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const shortValueOption = getCommitShortValueOption(value);
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return Boolean(shortValueOption && shortValueOption.consumesNextValue);
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}
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/**
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* Return true when a commit option already carries its value in the same token.
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*
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* @param {string} value
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* @returns {boolean}
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*/
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function commitOptionContainsInlineValue(value) {
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if (isCommitNoVerifyShortFlag(value)) {
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return false;
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}
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if (COMMIT_OPTIONS_WITH_INLINE_VALUE.some(prefix => value.startsWith(prefix))) {
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return true;
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}
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const shortValueOption = getCommitShortValueOption(value);
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return Boolean(shortValueOption && shortValueOption.containsInlineValue);
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}
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/**
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* Classify a combined short-option token that includes a value-taking option.
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*
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* @param {string} value
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* @returns {{consumesNextValue: boolean, containsInlineValue: boolean}|null}
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*/
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function getCommitShortValueOption(value) {
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if (!value.startsWith('-') || value.startsWith('--') || value === '-') {
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return null;
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}
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const options = value.slice(1);
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for (let i = 0; i < options.length; i++) {
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if (COMMIT_SHORT_OPTIONS_WITH_VALUE.has(options.charAt(i))) {
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return {
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consumesNextValue: i === options.length - 1,
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containsInlineValue: i < options.length - 1
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};
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}
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}
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return null;
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}
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/**
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* Return true when a token is commit's `-n` / `--no-verify` short form.
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*
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* @param {string} value
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* @returns {boolean}
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*/
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function isCommitNoVerifyShortFlag(value) {
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if (!value.startsWith('-') || value.startsWith('--') || value === '-') {
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return false;
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}
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// Short options cluster, so -n need not lead: `git commit -an` is -a plus -n
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// and bypasses the hooks just as `-n` does. Anchoring on the first character
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// let -an, -sn and -vn through.
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//
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// Scanning stops at a value-taking option because that option swallows the
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// rest of the cluster as its inline value — the n in `-mn` is message text,
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// not a flag.
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const options = value.slice(1);
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for (let i = 0; i < options.length; i++) {
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const option = options.charAt(i);
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if (option === 'n') return true;
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if (COMMIT_SHORT_OPTIONS_WITH_VALUE.has(option)) return false;
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if (COMMIT_SHORT_OPTIONS_WITH_OPTIONAL_VALUE.has(option)) return false;
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}
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return false;
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}
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/**
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* git's option parser accepts any unambiguous prefix of a long option, so
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* `--no-veri` and `--no-verif` run as --no-verify. Shorter prefixes such as
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* `--no-ver` are ambiguous with --no-verbose and git rejects them itself, so
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* refusing every prefix from `--no-v` up blocks nothing that would have run.
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*/
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function isNoVerifyLongFlag(value) {
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return value.length >= '--no-v'.length && '--no-verify'.startsWith(value);
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}
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const PROTECTED_GIT_COMMANDS = new Set(['commit', 'push', 'merge', 'cherry-pick', 'rebase', 'am']);
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const GIT_GLOBAL_VALUES = new Set(['-c', '-C', '--config-env', '--work-tree', '--git-dir', '--namespace', '--super-prefix']);
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const SHELLS = new Set(['sh', 'bash', 'dash', 'zsh', 'ksh']);
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const DATA_COMMANDS = new Set(['echo', 'printf', 'cat', 'tee', 'grep', 'head', 'tail', 'wc', 'sort', 'uniq', ':', 'true', 'false']);
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const CONTROL_WORDS = new Set(['!', 'if', 'then', 'elif', 'while', 'until', 'do', 'else']);
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function basename(value) {
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return value.replace(/\\/g, '/').split('/').pop();
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}
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function isGitExecutable(value) {
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const name = basename(value).toLowerCase();
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return name === 'git' || name === 'git.exe';
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}
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// Only explicit command-scoped assignments are tracked. No host environment,
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// exported shell state, arbitrary expansion or external configuration is read.
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function gitEnvironmentOverride(environment, budget) {
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const count = environment.get('GIT_CONFIG_COUNT') || '';
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budget.spend(count.length + environment.size + 1);
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// Git uses strtoul: leading ASCII whitespace/+ are accepted, trailing bytes
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// and counts above INT_MAX are rejected. Bound work by assignments we own.
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const configured = /^[ \t\r\n\v\f]*\+?[0-9]+(?![\s\S])/.test(count) ? Number(count) : 0;
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if (configured > 0 && configured <= 0x7fffffff && configured <= environment.size / 2) {
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let override = false;
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let complete = true;
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for (let i = 0; i < configured; i++) {
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budget.spend();
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const key = environment.get(`GIT_CONFIG_KEY_${i}`);
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if (key === undefined || !environment.has(`GIT_CONFIG_VALUE_${i}`)) { complete = false; break; }
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budget.spend(key.length + 1);
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override ||= key.toLowerCase() === 'core.hookspath';
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}
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if (complete && override) return true;
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}
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const parameters = environment.get('GIT_CONFIG_PARAMETERS');
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if (parameters) {
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budget.spend(parameters.length + 1);
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// Git's old 'key=value' and new 'key'='value' forms both use quote removal.
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// This inspects literal keys only; nested regions are never executed.
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for (const command of scanShell(parameters, budget).commands) {
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for (const word of command.words) {
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budget.spend(word.value.length + 1);
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if (word.value.toLowerCase().startsWith(GIT_CONFIG_KEY_PREFIX)) return true;
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}
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}
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}
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return false;
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}
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function checkGitWords(words, budget, start = 0, environmentOverride = false) {
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let index = start + 1;
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let override = environmentOverride;
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for (; index < words.length; index++) {
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const value = words[index].value;
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budget.spend(value.length + 1);
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if (!value.startsWith('-')) break;
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if (value === '--') { index++; break; }
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if (value === '-c' || value === '--config-env') {
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const setting = words[index + 1]?.value || '';
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budget.spend(setting.length + 1);
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override ||= setting.toLowerCase().startsWith(GIT_CONFIG_KEY_PREFIX);
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} else if (value.toLowerCase().startsWith(`-c${GIT_CONFIG_KEY_PREFIX}`) || value.toLowerCase().startsWith(`--config-env=${GIT_CONFIG_KEY_PREFIX}`)) override = true;
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if (GIT_GLOBAL_VALUES.has(value)) index++;
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}
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const command = words[index]?.value;
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budget.spend((command?.length || 0) + 1);
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if (!PROTECTED_GIT_COMMANDS.has(command)) return null;
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if (override) return `BLOCKED: Overriding core.hooksPath is not allowed with git ${command}. Git hooks must not be bypassed.`;
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let skipNext = false;
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for (index++; index < words.length; index++) {
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const value = words[index].value;
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budget.spend(value.length + 1);
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if (skipNext) { skipNext = false; continue; }
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if (value === '--') break;
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if (command === 'commit') {
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if (commitOptionConsumesNextValue(value)) { skipNext = true; continue; }
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if (commitOptionContainsInlineValue(value)) continue;
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}
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if (isNoVerifyLongFlag(value) || (command === 'commit' && isCommitNoVerifyShortFlag(value))) {
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return `BLOCKED: --no-verify flag is not allowed with git ${command}. Git hooks must not be bypassed.`;
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}
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}
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return null;
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}
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// Only explicit option grammars remove wrapper operands. Unknown launchers are
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// opaque/conservative, never guessed from a name found among data arguments.
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function executableWords(words, budget, inherited = new Map()) {
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budget.spend(inherited.size + 1);
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const environment = new Map(inherited);
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function suffix(start) {
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budget.spend(words.length - start);
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return { words: words.slice(start), environment };
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}
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function assignment(value) {
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const equals = value.indexOf('=');
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const key = value.slice(0, equals);
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if (/^GIT_CONFIG_(?:COUNT|PARAMETERS|(?:KEY|VALUE)_[0-9]+)$/.test(key)) environment.set(key, value.slice(equals + 1));
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}
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let i = 0;
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let assignments = true;
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let environmentAssignments = false;
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while (i < words.length) {
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const token = words[i];
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budget.spend(token.value.length + token.raw.length + 1);
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if (assignments && /^[A-Za-z_][A-Za-z0-9_]*=/.test(environmentAssignments ? token.value : token.raw)) { assignment(token.value); i++; continue; }
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if (!token.quoted && CONTROL_WORDS.has(token.value)) { i++; continue; }
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const name = basename(token.value);
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if (name === 'command') {
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i++;
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while (words[i]?.value.startsWith('-')) {
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const flag = words[i++].value;
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budget.spend(flag.length + 1);
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if (flag === '--') break;
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if (/^-[pvV]+$/.test(flag) && /[vV]/.test(flag)) return { words: [], environment };
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if (!/^-p+$/.test(flag)) return suffix(i - 1);
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}
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assignments = false; continue;
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}
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if (name === 'exec') {
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i++;
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while (words[i]?.value.startsWith('-')) {
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const flag = words[i++].value;
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budget.spend(flag.length + 1);
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if (flag === '--') break;
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if (/^-[cl]*a$/.test(flag)) i++;
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else if (!/^-([cl]*a.+|[cl]+)$/.test(flag)) return suffix(i - 1);
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if (flag.slice(1).split('a', 1)[0].includes('c')) environment.clear();
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}
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assignments = false; continue;
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}
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if (name === 'env' || name === 'sudo' || name === 'doas') {
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const env = name === 'env';
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const values = env
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? new Set(['-u', '--unset', '-C', '--chdir'])
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: new Set(['-u', '--user', '-g', '--group', '-h', '--host', '-p', '--prompt', '-C', '-T', '-R', '-D']);
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const flags = env ? new Set(['-i', '--ignore-environment', '-0', '--null']) : new Set(['-n', '-E', '-H', '-S', '-k', '-K', '-b']);
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i++;
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while (words[i]?.value.startsWith('-')) {
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const flag = words[i].value;
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budget.spend(flag.length + 1);
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if (flag === '--') { i++; break; }
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if (env && (flag === '-i' || flag === '--ignore-environment')) environment.clear();
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if (env && (flag === '-u' || flag === '--unset')) environment.delete(words[i + 1]?.value);
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else if (env && flag.startsWith('--unset=')) environment.delete(flag.slice('--unset='.length));
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else if (env && flag.startsWith('-u')) environment.delete(flag.slice(2));
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if (values.has(flag)) i += 2;
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else if (flags.has(flag) || [...values].some(value => value.startsWith('--') ? flag.startsWith(`${value}=`) : flag.startsWith(value) && flag.length > value.length)) i++;
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else return suffix(i - 1); // Includes opaque env -S / sudo shell modes.
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}
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assignments = true; environmentAssignments = true; continue;
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}
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return suffix(i);
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}
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return { words: [], environment };
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}
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function shellRole(words, budget, shell) {
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let i = 1;
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let stdin = false;
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let code = false;
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while (i < words.length) {
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const option = words[i].value;
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budget.spend(option.length + 1);
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if (option === '--' || option === '-') { i++; break; }
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if (!/^[+-]/.test(option)) break;
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if (option === '--rcfile' || option === '--init-file') { i += 2; continue; }
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if (option.startsWith('--')) {
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if (!['--noprofile', '--norc', '--posix', '--restricted', '--verbose', '--login'].includes(option)) return { kind: 'opaque', stdin: true };
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i++; continue;
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}
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// Bash accepts either sign and consumes a separate operand for each o/O
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// even inside a cluster. The command string follows ALL option processing,
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// not necessarily the argv word immediately after the first c flag.
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let next = i + 1;
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for (let j = 1; j < option.length; j++) {
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budget.spend();
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const flag = option[j];
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// Named-option arity is unproved for sh/dash/ksh: keep the invocation
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// opaque instead of consuming a code flag as a guessed option operand.
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if ((flag === 'o' || flag === 'O') && shell !== 'bash' && shell !== 'zsh') return { kind: 'opaque', stdin: true };
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if (flag === 'c') code = true;
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else if (flag === 's') stdin = true;
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else if (shell === 'zsh' && flag === 'o') {
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// zsh consumes the rest of this argv word as the option name, or one
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// separate word if no suffix exists, then ends this option cluster.
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if (j + 1 === option.length && next < words.length) next++;
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break;
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} else if (shell === 'zsh' && (flag === 'O' || flag === 'b')) {
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// These are not Bash's operand grammar; unmodeled zsh modes stay opaque.
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return { kind: 'opaque', stdin: true };
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} else if (flag === 'o' || flag === 'O') { if (next < words.length) next++; }
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else if (!'abefhiklmnprtuvxBCEHPTD'.includes(flag)) return { kind: 'opaque', stdin: true };
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}
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i = next;
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}
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if (code) return { kind: 'shell', code: words[i]?.value, stdin: false };
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// A script filename and its positional arguments are not shell source text.
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return { kind: 'shell', stdin: stdin || i === words.length };
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}
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function commandRole(words, budget) {
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if (!words.length) return { kind: 'data' };
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budget.spend(words[0].value.length + 1);
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const name = basename(words[0].value);
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if (isGitExecutable(words[0].value)) return { kind: 'git' };
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if (SHELLS.has(name)) return shellRole(words, budget, name);
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if (name === 'eval') {
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for (const word of words) budget.spend(word.value.length + 3);
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return { kind: 'shell', code: words.slice(words[1]?.value === '--' ? 2 : 1).map(word => word.value).join(' '), stdin: false };
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}
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if (DATA_COMMANDS.has(name)) return { kind: 'data' };
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return { kind: 'opaque', stdin: true };
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}
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// Literal producers only. Unmodeled transformations remain conservative rather
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// than executing a formatter, interpreter, shell or user-supplied command.
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function pipelineSources(command, budget) {
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const sources = [];
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for (let current = command; current; current = current.pipeFrom) {
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budget.spend(current.words.length + 1);
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const { words } = executableWords(current.words, budget);
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for (const word of words) budget.spend(word.value.length + 3);
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const name = basename(words[0]?.value || '');
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if (name === 'echo') sources.push({ text: words.slice(1).filter(word => !/^-[neE]+$/.test(word.value)).map(word => word.value).join(' ') });
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if (name === 'printf') {
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const format = words[1]?.value || '';
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if (format !== '-v') sources.push({ text: (format === '%s' || format === '%s\\n') ? words.slice(2).map(word => word.value).join('\n') : words.slice(1).map(word => word.value).join(' ') });
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}
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if (!DATA_COMMANDS.has(name)) {
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// Foreign transformations can introduce literal bypasses into executable
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// stdin. Treat their punctuation as delimiters, not as proved shell syntax.
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// This deliberately may refuse a transformation that removes a bypass; it
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// does not evaluate sed/interpreters or detect arbitrary generated source.
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const text = words.map(word => word.value).join(' ');
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budget.spend(2 * text.length + 1);
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sources.push({ text: text.replace(/[^\w$=.+-]/g, ' '), opaque: true });
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}
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for (const redirect of current.redirects) {
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if (redirect.operator === '<<<') sources.push({ text: redirect.word.value });
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else if (redirect.operator === '<<' || redirect.operator === '<<-') sources.push({ text: redirect.body });
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}
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}
|
|
return sources;
|
|
}
|
|
|
|
function checkCommand(input) {
|
|
const budget = createBudget(input.length);
|
|
const pending = [{ text: input, opaque: false, environment: new Map() }];
|
|
function enqueue(text, opaque = false, environment = new Map()) {
|
|
if (!text) return;
|
|
budget.spend(text.length + 1);
|
|
pending.push({ text, opaque, environment });
|
|
}
|
|
function inspectOpaque(words, text, environment) {
|
|
for (let index = 0; index < words.length; index++) {
|
|
const word = words[index];
|
|
budget.spend(word.value.length + 1);
|
|
if (isGitExecutable(word.value)) {
|
|
const reason = checkGitWords(words, budget, index, gitEnvironmentOverride(environment, budget));
|
|
if (reason) return reason;
|
|
}
|
|
if (word.value !== text && /git/i.test(word.value) && /[\s'"()]/.test(word.value)) enqueue(word.value, true, environment);
|
|
}
|
|
return null;
|
|
}
|
|
try {
|
|
while (pending.length) {
|
|
const task = pending.pop();
|
|
const scan = scanShell(task.text, budget);
|
|
for (const text of scan.nested) enqueue(text, false, task.environment);
|
|
for (const command of scan.commands) {
|
|
const { words, environment } = executableWords(command.words, budget, task.environment);
|
|
const role = commandRole(words, budget);
|
|
const reason = task.opaque || role.kind === 'opaque'
|
|
? inspectOpaque(command.words, task.text, environment)
|
|
: role.kind === 'git' ? checkGitWords(words, budget, 0, gitEnvironmentOverride(environment, budget)) : null;
|
|
if (reason) return { blocked: true, reason };
|
|
if (role.code) enqueue(role.code, false, environment);
|
|
if (role.stdin) {
|
|
for (const redirect of command.redirects) {
|
|
if (redirect.operator === '<<<') enqueue(redirect.word.value, role.kind === 'opaque', environment);
|
|
else if (redirect.operator === '<<' || redirect.operator === '<<-') enqueue(redirect.body, role.kind === 'opaque', environment);
|
|
}
|
|
if (command.pipeFrom) {
|
|
for (const source of pipelineSources(command.pipeFrom, budget)) enqueue(source.text, source.opaque || role.kind === 'opaque', environment);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
} catch (error) {
|
|
if (!(error instanceof RangeError)) throw error;
|
|
return { blocked: true, reason: 'BLOCKED: Shell analysis work budget exceeded; hook-bypass safety could not be established.' };
|
|
}
|
|
return { blocked: false };
|
|
}
|
|
|
|
/**
|
|
* Extract the command string from hook input (JSON or plain text).
|
|
*
|
|
* @param {string} rawInput
|
|
* @returns {string}
|
|
*/
|
|
function extractCommand(rawInput) {
|
|
const trimmed = rawInput.trim();
|
|
if (!trimmed.startsWith('{')) {
|
|
return trimmed;
|
|
}
|
|
|
|
try {
|
|
const parsed = JSON.parse(trimmed);
|
|
if (typeof parsed !== 'object' || parsed === null) {
|
|
return trimmed;
|
|
}
|
|
|
|
// Claude Code format: { tool_input: { command: "..." } }
|
|
const cmd = parsed.tool_input?.command;
|
|
if (typeof cmd === 'string') {
|
|
return cmd;
|
|
}
|
|
|
|
// Generic JSON formats
|
|
for (const key of ['command', 'cmd', 'input', 'shell', 'script']) {
|
|
if (typeof parsed[key] === 'string') {
|
|
return parsed[key];
|
|
}
|
|
}
|
|
|
|
return trimmed;
|
|
} catch {
|
|
return trimmed;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Exportable run() for in-process execution via run-with-flags.js.
|
|
*
|
|
* @param {string} rawInput
|
|
* @returns {{exitCode: number, stderr?: string}}
|
|
*/
|
|
function run(rawInput) {
|
|
const command = extractCommand(rawInput);
|
|
const result = checkCommand(command);
|
|
|
|
if (result.blocked) {
|
|
return {
|
|
exitCode: 2,
|
|
stderr: result.reason
|
|
};
|
|
}
|
|
|
|
return { exitCode: 0 };
|
|
}
|
|
|
|
module.exports = { run };
|
|
|
|
// Stdin fallback for spawnSync execution — only when invoked directly, not via require()
|
|
if (require.main === module) {
|
|
process.stdin.setEncoding('utf8');
|
|
process.stdin.on('data', chunk => {
|
|
if (raw.length < MAX_STDIN) {
|
|
const remaining = MAX_STDIN - raw.length;
|
|
raw += chunk.substring(0, remaining);
|
|
}
|
|
});
|
|
|
|
process.stdin.on('end', () => {
|
|
const command = extractCommand(raw);
|
|
const result = checkCommand(command);
|
|
|
|
if (result.blocked) {
|
|
process.stderr.write(result.reason + '\n');
|
|
process.exit(2);
|
|
}
|
|
|
|
process.stdout.write(raw);
|
|
});
|
|
}
|