feat: respect registry-scoped certfile and keyfile options

Closes #118
RFC: npm/rfcs#591

Add support for registry-scoped certfile and keyfile options, e.g.

```
{
  "//my.registry.example/npm/:certfile": "~/.secret/stuff.crt",
  "//my.registry.example/npm/:keyfile": "~/.secret/stuff.key"
}
```

Since these are registry-specific, they will override top-level cert and
key options (if set).

Like the top-level `cafile` option, these registry-scoped options are
silently ignored if invalid.

lib/auth.js

@@ -1,4 +1,5 @@
 'use strict'
+const fs = require('fs')
 const npa = require('npm-package-arg')
 const { URL } = require('url')
 
@@ -7,7 +8,8 @@ const { URL } = require('url')
 const regKeyFromURI = (uri, opts) => {
   const parsed = new URL(uri)
   // try to find a config key indicating we have auth for this registry
-  // can be one of :_authToken, :_auth, or :_password and :username
+  // can be one of :_authToken, :_auth, :_password and :username, or
+  // :certfile and :keyfile
   // We walk up the "path" until we're left with just //<host>[:<port>],
   // stopping when we reach '//'.
   let regKey = `//${parsed.host}${parsed.pathname}`
@@ -26,7 +28,8 @@ const regKeyFromURI = (uri, opts) => {
 const hasAuth = (regKey, opts) => (
   opts[`${regKey}:_authToken`] ||
   opts[`${regKey}:_auth`] ||
-  opts[`${regKey}:username`] && opts[`${regKey}:_password`]
+  opts[`${regKey}:username`] && opts[`${regKey}:_password`] ||
+  opts[`${regKey}:certfile`] && opts[`${regKey}:keyfile`]
 )
 
 const sameHost = (a, b) => {
@@ -44,6 +47,17 @@ const getRegistry = opts => {
   return scopeReg || opts.registry
 }
 
+const maybeReadFile = file => {
+  try {
+    return fs.readFileSync(file, 'utf8')
+  } catch (er) {
+    if (er.code !== 'ENOENT') {
+      throw er
+    }
+    return null
+  }
+}
+
 const getAuth = (uri, opts = {}) => {
   const { forceAuth } = opts
   if (!uri) {
@@ -59,6 +73,8 @@ const getAuth = (uri, opts = {}) => {
       username: forceAuth.username,
       password: forceAuth._password || forceAuth.password,
       auth: forceAuth._auth || forceAuth.auth,
+      certfile: forceAuth.certfile,
+      keyfile: forceAuth.keyfile,
     })
   }
 
@@ -82,6 +98,8 @@ const getAuth = (uri, opts = {}) => {
     [`${regKey}:username`]: username,
     [`${regKey}:_password`]: password,
     [`${regKey}:_auth`]: auth,
+    [`${regKey}:certfile`]: certfile,
+    [`${regKey}:keyfile`]: keyfile,
   } = opts
 
   return new Auth({
@@ -90,15 +108,19 @@ const getAuth = (uri, opts = {}) => {
     auth,
     username,
     password,
+    certfile,
+    keyfile,
   })
 }
 
 class Auth {
-  constructor ({ token, auth, username, password, scopeAuthKey }) {
+  constructor ({ token, auth, username, password, scopeAuthKey, certfile, keyfile }) {
     this.scopeAuthKey = scopeAuthKey
     this.token = null
     this.auth = null
     this.isBasicAuth = false
+    this.cert = null
+    this.key = null
     if (token) {
       this.token = token
     } else if (auth) {
@@ -108,6 +130,15 @@ class Auth {
       this.auth = Buffer.from(`${username}:${p}`, 'utf8').toString('base64')
       this.isBasicAuth = true
     }
+    // mTLS may be used in conjunction with another auth method above
+    if (certfile && keyfile) {
+      const cert = maybeReadFile(certfile, 'utf-8')
+      const key = maybeReadFile(keyfile, 'utf-8')
+      if (cert && key) {
+        this.cert = cert
+        this.key = key
+      }
+    }
   }
 }
 

lib/index.js

@@ -112,10 +112,10 @@ function regFetch (uri, /* istanbul ignore next */ opts_ = {}) {
       cache: getCacheMode(opts),
       cachePath: opts.cache,
       ca: opts.ca,
-      cert: opts.cert,
+      cert: auth.cert || opts.cert,
       headers,
       integrity: opts.integrity,
-      key: opts.key,
+      key: auth.key || opts.key,
       localAddress: opts.localAddress,
       maxSockets: opts.maxSockets,
       memoize: opts.memoize,

test/auth.js

@@ -33,6 +33,8 @@ t.test('basic auth', t => {
     token: null,
     isBasicAuth: true,
     auth: Buffer.from('user:pass').toString('base64'),
+    cert: null,
+    key: null,
   }, 'basic auth details generated')
 
   const opts = Object.assign({}, OPTS, config)
@@ -62,6 +64,8 @@ t.test('token auth', t => {
     isBasicAuth: false,
     token: 'c0ffee',
     auth: null,
+    cert: null,
+    key: null,
   }, 'correct auth token picked out')
 
   const opts = Object.assign({}, OPTS, config)
@@ -77,24 +81,37 @@ t.test('token auth', t => {
 })
 
 t.test('forceAuth', t => {
+  const dir = t.testdir({
+    'my.cert': 'my cert',
+    'my.key': 'my key',
+    'other.cert': 'other cert',
+    'other.key': 'other key',
+  })
+
   const config = {
     registry: 'https://my.custom.registry/here/',
     token: 'deadbeef',
     'always-auth': false,
     '//my.custom.registry/here/:_authToken': 'c0ffee',
     '//my.custom.registry/here/:token': 'nope',
+    '//my.custom.registry/here/:certfile': `${dir}/my.cert`,
+    '//my.custom.registry/here/:keyfile': `${dir}/my.key`,
     forceAuth: {
       username: 'user',
       password: Buffer.from('pass', 'utf8').toString('base64'),
       email: '[email protected]',
       'always-auth': true,
+      certfile: `${dir}/other.cert`,
+      keyfile: `${dir}/other.key`,
     },
   }
   t.same(getAuth(config.registry, config), {
     scopeAuthKey: null,
     token: null,
     isBasicAuth: true,
     auth: Buffer.from('user:pass').toString('base64'),
+    cert: 'other cert',
+    key: 'other key',
   }, 'only forceAuth details included')
 
   const opts = Object.assign({}, OPTS, config)
@@ -126,6 +143,8 @@ t.test('forceAuth token', t => {
     isBasicAuth: false,
     token: 'cafebad',
     auth: null,
+    cert: null,
+    key: null,
   }, 'correct forceAuth token picked out')
 
   const opts = Object.assign({}, OPTS, config)
@@ -152,6 +171,8 @@ t.test('_auth auth', t => {
     token: null,
     isBasicAuth: false,
     auth: 'c0ffee',
+    cert: null,
+    key: null,
   }, 'correct _auth picked out')
 
   const opts = Object.assign({}, OPTS, config)
@@ -177,6 +198,8 @@ t.test('_auth username:pass auth', t => {
     token: null,
     isBasicAuth: false,
     auth: auth,
+    cert: null,
+    key: null,
   }, 'correct _auth picked out')
 
   const opts = Object.assign({}, OPTS, config)
@@ -226,6 +249,8 @@ t.test('globally-configured auth', t => {
     token: null,
     isBasicAuth: true,
     auth: Buffer.from('globaluser:globalpass').toString('base64'),
+    cert: null,
+    key: null,
   }, 'basic auth details generated from global settings')
 
   const tokenConfig = {
@@ -239,6 +264,8 @@ t.test('globally-configured auth', t => {
     token: 'deadbeef',
     isBasicAuth: false,
     auth: null,
+    cert: null,
+    key: null,
   }, 'correct global auth token picked out')
 
   const _authConfig = {
@@ -252,6 +279,8 @@ t.test('globally-configured auth', t => {
     token: null,
     isBasicAuth: false,
     auth: 'deadbeef',
+    cert: null,
+    key: null,
   }, 'correct _auth picked out')
 
   t.end()
@@ -270,6 +299,8 @@ t.test('otp token passed through', t => {
     token: 'c0ffee',
     isBasicAuth: false,
     auth: null,
+    cert: null,
+    key: null,
   }, 'correct auth token picked out')
 
   const opts = Object.assign({}, OPTS, config)
@@ -337,6 +368,8 @@ t.test('always-auth', t => {
     token: 'c0ffee',
     isBasicAuth: false,
     auth: null,
+    cert: null,
+    key: null,
   }, 'correct auth token picked out')
 
   const opts = Object.assign({}, OPTS, config)
@@ -349,25 +382,36 @@ t.test('always-auth', t => {
 })
 
 t.test('scope-based auth', t => {
+  const dir = t.testdir({
+    'my.cert': 'my cert',
+    'my.key': 'my key',
+  })
+
   const config = {
     registry: 'https://my.custom.registry/here/',
     scope: '@myscope',
     '@myscope:registry': 'https://my.custom.registry/here/',
     token: 'deadbeef',
     '//my.custom.registry/here/:_authToken': 'c0ffee',
     '//my.custom.registry/here/:token': 'nope',
+    '//my.custom.registry/here/:certfile': `${dir}/my.cert`,
+    '//my.custom.registry/here/:keyfile': `${dir}/my.key`,
   }
   t.same(getAuth(config['@myscope:registry'], config), {
     scopeAuthKey: null,
     auth: null,
     isBasicAuth: false,
     token: 'c0ffee',
+    cert: 'my cert',
+    key: 'my key',
   }, 'correct auth token picked out')
   t.same(getAuth(config['@myscope:registry'], config), {
     scopeAuthKey: null,
     auth: null,
     isBasicAuth: false,
     token: 'c0ffee',
+    cert: 'my cert',
+    key: 'my key',
   }, 'correct auth token picked out without scope config having an @')
 
   const opts = Object.assign({}, OPTS, config)
@@ -392,6 +436,32 @@ t.test('auth needs a uri', t => {
   t.end()
 })
 
+t.test('certfile and keyfile errors', t => {
+  const dir = t.testdir({
+    'my.cert': 'my cert',
+  })
+
+  t.same(getAuth('https://my.custom.registry/here/', {
+    '//my.custom.registry/here/:certfile': `${dir}/my.cert`,
+    '//my.custom.registry/here/:keyfile': `${dir}/nosuch.key`,
+  }), {
+    scopeAuthKey: null,
+    auth: null,
+    isBasicAuth: false,
+    token: null,
+    cert: null,
+    key: null,
+  }, 'cert and key ignored if one doesn\'t exist')
+
+  t.throws(() => {
+    getAuth('https://my.custom.registry/here/', {
+      '//my.custom.registry/here/:certfile': `${dir}/my.cert`,
+      '//my.custom.registry/here/:keyfile': dir,
+    })
+  }, /EISDIR/, 'other read errors are propagated')
+  t.end()
+})
+
 t.test('do not be thrown by other weird configs', t => {
   const opts = {
     scope: '@asdf',
@@ -412,6 +482,8 @@ t.test('do not be thrown by other weird configs', t => {
     token: 'correct bearer token',
     isBasicAuth: false,
     auth: null,
+    cert: null,
+    key: null,
   })
   t.end()
 })
@@ -430,27 +502,35 @@ t.test('scopeAuthKey tests', t => {
     auth: null,
     isBasicAuth: false,
     token: null,
+    cert: null,
+    key: null,
   }, 'regular scoped spec')
 
   t.same(getAuth(uri, { ...opts, spec: 'foo@npm:@scope/foo@latest' }), {
     scopeAuthKey: '//scope-host.com/',
     auth: null,
     isBasicAuth: false,
     token: null,
+    cert: null,
+    key: null,
   }, 'scoped pkg aliased to unscoped name')
 
   t.same(getAuth(uri, { ...opts, spec: '@other-scope/foo@npm:@scope/foo@latest' }), {
     scopeAuthKey: '//scope-host.com/',
     auth: null,
     isBasicAuth: false,
     token: null,
+    cert: null,
+    key: null,
   }, 'scoped name aliased to other scope with auth')
 
   t.same(getAuth(uri, { ...opts, spec: '@scope/foo@npm:foo@latest' }), {
     scopeAuthKey: null,
     auth: null,
     isBasicAuth: false,
     token: null,
+    cert: null,
+    key: null,
   }, 'unscoped aliased to scoped name')
 
   t.end()
@@ -470,18 +550,24 @@ t.test('registry host matches, path does not, send auth', t => {
     token: 'c0ffee',
     auth: null,
     isBasicAuth: false,
+    cert: null,
+    key: null,
   })
   t.same(getAuth(uri, { ...opts, spec: '@other-scope/foo' }), {
     scopeAuthKey: '//other-scope-registry.com/other/scope/',
     token: null,
     auth: null,
     isBasicAuth: false,
+    cert: null,
+    key: null,
   })
   t.same(getAuth(uri, { ...opts, registry: 'https://scope-host.com/scope/host/' }), {
     scopeAuthKey: null,
     token: 'c0ffee',
     auth: null,
     isBasicAuth: false,
+    cert: null,
+    key: null,
   })
   t.end()
 })