Merge pull request #633 from nakaeeee/saml-auth

Support SAML authentication

2 files changed, 96 insertions, 0 deletions

diff --git a/lib/web/auth/index.js b/lib/web/auth/index.js
index 4b618101..db5ff11d 100644
--- a/lib/web/auth/index.js
+++ b/lib/web/auth/index.js
@@ -37,6 +37,7 @@ if (config.isMattermostEnable) authRouter.use(require('./mattermost'))
 if (config.isDropboxEnable) authRouter.use(require('./dropbox'))
 if (config.isGoogleEnable) authRouter.use(require('./google'))
 if (config.isLDAPEnable) authRouter.use(require('./ldap'))
+if (config.isSAMLEnable) authRouter.use(require('./saml'))
 if (config.isEmailEnable) authRouter.use(require('./email'))
 
 // logout
diff --git a/lib/web/auth/saml/index.js b/lib/web/auth/saml/index.js
new file mode 100644
index 00000000..386293ae
--- /dev/null
+++ b/lib/web/auth/saml/index.js
@@ -0,0 +1,95 @@
+'use strict'
+
+const Router = require('express').Router
+const passport = require('passport')
+const SamlStrategy = require('passport-saml').Strategy
+const config = require('../../../config')
+const models = require('../../../models')
+const logger = require('../../../logger')
+const {urlencodedParser} = require('../../utils')
+const fs = require('fs')
+const intersection = function (array1, array2) { return array1.filter((n) => array2.includes(n)) }
+
+let samlAuth = module.exports = Router()
+
+passport.use(new SamlStrategy({
+  callbackUrl: config.serverurl + '/auth/saml/callback',
+  entryPoint: config.saml.idpSsoUrl,
+  issuer: config.saml.issuer || config.serverurl,
+  cert: fs.readFileSync(config.saml.idpCert, 'utf-8'),
+  identifierFormat: config.saml.identifierFormat
+}, function (user, done) {
+  // check authorization if needed
+  if (config.saml.externalGroups && config.saml.grouptAttribute) {
+    var externalGroups = intersection(config.saml.externalGroups, user[config.saml.groupAttribute])
+    if (externalGroups.length > 0) {
+      logger.error('saml permission denied: ' + externalGroups.join(', '))
+      return done('Permission denied', null)
+    }
+  }
+  if (config.saml.requiredGroups && config.saml.grouptAttribute) {
+    if (intersection(config.saml.requiredGroups, user[config.saml.groupAttribute]).length === 0) {
+      logger.error('saml permission denied')
+      return done('Permission denied', null)
+    }
+  }
+  // user creation
+  var uuid = user[config.saml.attribute.id] || user.nameID
+  var profile = {
+    provider: 'saml',
+    id: 'SAML-' + uuid,
+    username: user[config.saml.attribute.username] || user.nameID,
+    emails: user[config.saml.attribute.email] ? [user[config.saml.attribute.email]] : []
+  }
+  if (profile.emails.length === 0 && config.saml.identifierFormat === 'urn:oasis:names:tc:SAML:1.1:nameid-format:emailAddress') {
+    profile.emails.push(user.nameID)
+  }
+  var stringifiedProfile = JSON.stringify(profile)
+  models.User.findOrCreate({
+    where: {
+      profileid: profile.id.toString()
+    },
+    defaults: {
+      profile: stringifiedProfile
+    }
+  }).spread(function (user, created) {
+    if (user) {
+      var needSave = false
+      if (user.profile !== stringifiedProfile) {
+        user.profile = stringifiedProfile
+        needSave = true
+      }
+      if (needSave) {
+        user.save().then(function () {
+          if (config.debug) { logger.debug('user login: ' + user.id) }
+          return done(null, user)
+        })
+      } else {
+        if (config.debug) { logger.debug('user login: ' + user.id) }
+        return done(null, user)
+      }
+    }
+  }).catch(function (err) {
+    logger.error('saml auth failed: ' + err)
+    return done(err, null)
+  })
+}))
+
+samlAuth.get('/auth/saml',
+  passport.authenticate('saml', {
+    successReturnToOrRedirect: config.serverurl + '/',
+    failureRedirect: config.serverurl + '/'
+  })
+)
+
+samlAuth.post('/auth/saml/callback', urlencodedParser,
+  passport.authenticate('saml', {
+    successReturnToOrRedirect: config.serverurl + '/',
+    failureRedirect: config.serverurl + '/'
+  })
+)
+
+samlAuth.get('/auth/saml/metadata', function (req, res) {
+  res.type('application/xml')
+  res.send(passport._strategy('saml').generateServiceProviderMetadata())
+})