mirror of https://github.com/actions/checkout
351 lines
12 KiB
TypeScript
351 lines
12 KiB
TypeScript
import * as assert from 'assert'
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import * as core from '@actions/core'
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import * as exec from '@actions/exec'
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import * as fs from 'fs'
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import * as io from '@actions/io'
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import * as os from 'os'
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import * as path from 'path'
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import * as regexpHelper from './regexp-helper'
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import * as stateHelper from './state-helper'
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import * as urlHelper from './url-helper'
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import {default as uuid} from 'uuid/v4'
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import {IGitCommandManager} from './git-command-manager'
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import {IGitSourceSettings} from './git-source-settings'
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const IS_WINDOWS = process.platform === 'win32'
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const SSH_COMMAND_KEY = 'core.sshCommand'
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export interface IGitAuthHelper {
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configureAuth(): Promise<void>
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configureGlobalAuth(): Promise<void>
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configureSubmoduleAuth(): Promise<void>
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removeAuth(): Promise<void>
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removeGlobalAuth(): Promise<void>
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}
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export function createAuthHelper(
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git: IGitCommandManager,
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settings?: IGitSourceSettings
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): IGitAuthHelper {
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return new GitAuthHelper(git, settings)
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}
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class GitAuthHelper {
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private readonly git: IGitCommandManager
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private readonly settings: IGitSourceSettings
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private readonly tokenConfigKey: string
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private readonly tokenConfigValue: string
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private readonly tokenPlaceholderConfigValue: string
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private readonly insteadOfKey: string
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private readonly insteadOfValue: string
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private sshCommand = ''
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private sshKeyPath = ''
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private sshKnownHostsPath = ''
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private temporaryHomePath = ''
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constructor(
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gitCommandManager: IGitCommandManager,
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gitSourceSettings?: IGitSourceSettings
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) {
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this.git = gitCommandManager
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this.settings = gitSourceSettings || (({} as unknown) as IGitSourceSettings)
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// Token auth header
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const serverUrl = urlHelper.getServerUrl()
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this.tokenConfigKey = `http.${serverUrl.origin}/.extraheader` // "origin" is SCHEME://HOSTNAME[:PORT]
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const basicCredential = Buffer.from(
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`x-access-token:${this.settings.authToken}`,
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'utf8'
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).toString('base64')
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core.setSecret(basicCredential)
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this.tokenPlaceholderConfigValue = `AUTHORIZATION: basic ***`
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this.tokenConfigValue = `AUTHORIZATION: basic ${basicCredential}`
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// Instead of SSH URL
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this.insteadOfKey = `url.${serverUrl.origin}/.insteadOf` // "origin" is SCHEME://HOSTNAME[:PORT]
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this.insteadOfValue = `git@${serverUrl.hostname}:`
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}
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async configureAuth(): Promise<void> {
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// Remove possible previous values
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await this.removeAuth()
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// Configure new values
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await this.configureSsh()
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await this.configureToken()
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}
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async configureGlobalAuth(): Promise<void> {
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// Create a temp home directory
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const runnerTemp = process.env['RUNNER_TEMP'] || ''
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assert.ok(runnerTemp, 'RUNNER_TEMP is not defined')
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const uniqueId = uuid()
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this.temporaryHomePath = path.join(runnerTemp, uniqueId)
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await fs.promises.mkdir(this.temporaryHomePath, {recursive: true})
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// Copy the global git config
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const gitConfigPath = path.join(
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process.env['HOME'] || os.homedir(),
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'.gitconfig'
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)
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const newGitConfigPath = path.join(this.temporaryHomePath, '.gitconfig')
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let configExists = false
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try {
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await fs.promises.stat(gitConfigPath)
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configExists = true
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} catch (err) {
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if ((err as any)?.code !== 'ENOENT') {
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throw err
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}
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}
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if (configExists) {
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core.info(`Copying '${gitConfigPath}' to '${newGitConfigPath}'`)
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await io.cp(gitConfigPath, newGitConfigPath)
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} else {
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await fs.promises.writeFile(newGitConfigPath, '')
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}
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try {
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// Override HOME
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core.info(
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`Temporarily overriding HOME='${this.temporaryHomePath}' before making global git config changes`
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)
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this.git.setEnvironmentVariable('HOME', this.temporaryHomePath)
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// Configure the token
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await this.configureToken(newGitConfigPath, true)
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// Configure HTTPS instead of SSH
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await this.git.tryConfigUnset(this.insteadOfKey, true)
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if (!this.settings.sshKey) {
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await this.git.config(this.insteadOfKey, this.insteadOfValue, true)
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}
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} catch (err) {
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// Unset in case somehow written to the real global config
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core.info(
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'Encountered an error when attempting to configure token. Attempting unconfigure.'
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)
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await this.git.tryConfigUnset(this.tokenConfigKey, true)
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throw err
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}
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}
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async configureSubmoduleAuth(): Promise<void> {
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// Remove possible previous HTTPS instead of SSH
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await this.removeGitConfig(this.insteadOfKey, true)
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if (this.settings.persistCredentials) {
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// Configure a placeholder value. This approach avoids the credential being captured
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// by process creation audit events, which are commonly logged. For more information,
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// refer to https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/component-updates/command-line-process-auditing
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const output = await this.git.submoduleForeach(
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`git config --local '${this.tokenConfigKey}' '${this.tokenPlaceholderConfigValue}' && git config --local --show-origin --name-only --get-regexp remote.origin.url`,
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this.settings.nestedSubmodules
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)
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// Replace the placeholder
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const configPaths: string[] =
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output.match(/(?<=(^|\n)file:)[^\t]+(?=\tremote\.origin\.url)/g) || []
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for (const configPath of configPaths) {
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core.debug(`Replacing token placeholder in '${configPath}'`)
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await this.replaceTokenPlaceholder(configPath)
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}
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if (this.settings.sshKey) {
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// Configure core.sshCommand
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await this.git.submoduleForeach(
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`git config --local '${SSH_COMMAND_KEY}' '${this.sshCommand}'`,
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this.settings.nestedSubmodules
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)
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} else {
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// Configure HTTPS instead of SSH
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await this.git.submoduleForeach(
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`git config --local '${this.insteadOfKey}' '${this.insteadOfValue}'`,
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this.settings.nestedSubmodules
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)
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}
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}
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}
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async removeAuth(): Promise<void> {
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await this.removeSsh()
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await this.removeToken()
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}
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async removeGlobalAuth(): Promise<void> {
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core.debug(`Unsetting HOME override`)
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this.git.removeEnvironmentVariable('HOME')
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await io.rmRF(this.temporaryHomePath)
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}
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private async configureSsh(): Promise<void> {
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if (!this.settings.sshKey) {
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return
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}
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// Write key
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const runnerTemp = process.env['RUNNER_TEMP'] || ''
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assert.ok(runnerTemp, 'RUNNER_TEMP is not defined')
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const uniqueId = uuid()
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this.sshKeyPath = path.join(runnerTemp, uniqueId)
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stateHelper.setSshKeyPath(this.sshKeyPath)
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await fs.promises.mkdir(runnerTemp, {recursive: true})
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await fs.promises.writeFile(
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this.sshKeyPath,
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this.settings.sshKey.trim() + '\n',
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{mode: 0o600}
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)
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// Remove inherited permissions on Windows
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if (IS_WINDOWS) {
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const icacls = await io.which('icacls.exe')
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await exec.exec(
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`"${icacls}" "${this.sshKeyPath}" /grant:r "${process.env['USERDOMAIN']}\\${process.env['USERNAME']}:F"`
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)
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await exec.exec(`"${icacls}" "${this.sshKeyPath}" /inheritance:r`)
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}
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// Write known hosts
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const userKnownHostsPath = path.join(os.homedir(), '.ssh', 'known_hosts')
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let userKnownHosts = ''
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try {
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userKnownHosts = (
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await fs.promises.readFile(userKnownHostsPath)
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).toString()
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} catch (err) {
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if ((err as any)?.code !== 'ENOENT') {
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throw err
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}
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}
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let knownHosts = ''
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if (userKnownHosts) {
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knownHosts += `# Begin from ${userKnownHostsPath}\n${userKnownHosts}\n# End from ${userKnownHostsPath}\n`
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}
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if (this.settings.sshKnownHosts) {
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knownHosts += `# Begin from input known hosts\n${this.settings.sshKnownHosts}\n# end from input known hosts\n`
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}
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knownHosts += `# Begin implicitly added github.com\ngithub.com ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAq2A7hRGmdnm9tUDbO9IDSwBK6TbQa+PXYPCPy6rbTrTtw7PHkccKrpp0yVhp5HdEIcKr6pLlVDBfOLX9QUsyCOV0wzfjIJNlGEYsdlLJizHhbn2mUjvSAHQqZETYP81eFzLQNnPHt4EVVUh7VfDESU84KezmD5QlWpXLmvU31/yMf+Se8xhHTvKSCZIFImWwoG6mbUoWf9nzpIoaSjB+weqqUUmpaaasXVal72J+UX2B+2RPW3RcT0eOzQgqlJL3RKrTJvdsjE3JEAvGq3lGHSZXy28G3skua2SmVi/w4yCE6gbODqnTWlg7+wC604ydGXA8VJiS5ap43JXiUFFAaQ==\n# End implicitly added github.com\n`
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this.sshKnownHostsPath = path.join(runnerTemp, `${uniqueId}_known_hosts`)
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stateHelper.setSshKnownHostsPath(this.sshKnownHostsPath)
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await fs.promises.writeFile(this.sshKnownHostsPath, knownHosts)
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// Configure GIT_SSH_COMMAND
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const sshPath = await io.which('ssh', true)
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this.sshCommand = `"${sshPath}" -i "$RUNNER_TEMP/${path.basename(
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this.sshKeyPath
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)}"`
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if (this.settings.sshStrict) {
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this.sshCommand += ' -o StrictHostKeyChecking=yes -o CheckHostIP=no'
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}
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this.sshCommand += ` -o "UserKnownHostsFile=$RUNNER_TEMP/${path.basename(
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this.sshKnownHostsPath
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)}"`
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core.info(`Temporarily overriding GIT_SSH_COMMAND=${this.sshCommand}`)
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this.git.setEnvironmentVariable('GIT_SSH_COMMAND', this.sshCommand)
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// Configure core.sshCommand
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if (this.settings.persistCredentials) {
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await this.git.config(SSH_COMMAND_KEY, this.sshCommand)
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}
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}
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private async configureToken(
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configPath?: string,
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globalConfig?: boolean
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): Promise<void> {
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// Validate args
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assert.ok(
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(configPath && globalConfig) || (!configPath && !globalConfig),
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'Unexpected configureToken parameter combinations'
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)
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// Default config path
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if (!configPath && !globalConfig) {
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configPath = path.join(this.git.getWorkingDirectory(), '.git', 'config')
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}
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// Configure a placeholder value. This approach avoids the credential being captured
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// by process creation audit events, which are commonly logged. For more information,
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// refer to https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/manage/component-updates/command-line-process-auditing
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await this.git.config(
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this.tokenConfigKey,
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this.tokenPlaceholderConfigValue,
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globalConfig
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)
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// Replace the placeholder
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await this.replaceTokenPlaceholder(configPath || '')
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}
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private async replaceTokenPlaceholder(configPath: string): Promise<void> {
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assert.ok(configPath, 'configPath is not defined')
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let content = (await fs.promises.readFile(configPath)).toString()
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const placeholderIndex = content.indexOf(this.tokenPlaceholderConfigValue)
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if (
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placeholderIndex < 0 ||
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placeholderIndex != content.lastIndexOf(this.tokenPlaceholderConfigValue)
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) {
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throw new Error(`Unable to replace auth placeholder in ${configPath}`)
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}
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assert.ok(this.tokenConfigValue, 'tokenConfigValue is not defined')
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content = content.replace(
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this.tokenPlaceholderConfigValue,
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this.tokenConfigValue
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)
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await fs.promises.writeFile(configPath, content)
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}
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private async removeSsh(): Promise<void> {
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// SSH key
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const keyPath = this.sshKeyPath || stateHelper.SshKeyPath
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if (keyPath) {
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try {
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await io.rmRF(keyPath)
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} catch (err) {
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core.debug(`${(err as any)?.message ?? err}`)
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core.warning(`Failed to remove SSH key '${keyPath}'`)
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}
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}
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// SSH known hosts
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const knownHostsPath =
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this.sshKnownHostsPath || stateHelper.SshKnownHostsPath
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if (knownHostsPath) {
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try {
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await io.rmRF(knownHostsPath)
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} catch {
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// Intentionally empty
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}
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}
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// SSH command
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await this.removeGitConfig(SSH_COMMAND_KEY)
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}
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private async removeToken(): Promise<void> {
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// HTTP extra header
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await this.removeGitConfig(this.tokenConfigKey)
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}
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private async removeGitConfig(
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configKey: string,
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submoduleOnly: boolean = false
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): Promise<void> {
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if (!submoduleOnly) {
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if (
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(await this.git.configExists(configKey)) &&
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!(await this.git.tryConfigUnset(configKey))
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) {
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// Load the config contents
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core.warning(`Failed to remove '${configKey}' from the git config`)
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}
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}
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const pattern = regexpHelper.escape(configKey)
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await this.git.submoduleForeach(
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`git config --local --name-only --get-regexp '${pattern}' && git config --local --unset-all '${configKey}' || :`,
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true
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)
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}
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}
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