add LDAP authentication

Gemfile.lock

@@ -116,6 +116,7 @@ GEM
     multi_json (1.12.1)
     multi_xml (0.5.5)
     multipart-post (2.0.0)
+    net-ldap (0.16.0)
     nio4r (1.2.1)
     nokogiri (1.6.8.1)
       mini_portile2 (~> 2.1.0)
@@ -134,6 +135,11 @@ GEM
       multi_json (~> 1.3)
       omniauth (>= 1.1.1)
       omniauth-oauth2 (>= 1.3.1)
+    omniauth-ldap (1.0.5)
+      net-ldap (~> 0.12)
+      omniauth (~> 1.0)
+      pyu-ruby-sasl (~> 0.0.3.2)
+      rubyntlm (~> 0.3.4)
     omniauth-oauth (1.1.0)
       oauth
       omniauth (~> 1.0)
@@ -151,6 +157,7 @@ GEM
       mimemagic (= 0.3.0)
     pg (0.19.0)
     puma (3.6.0)
+    pyu-ruby-sasl (0.0.3.3)
     rack (2.0.1)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -184,6 +191,7 @@ GEM
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
+    rubyntlm (0.3.4)
     sass (3.4.22)
     sass-rails (5.0.6)
       railties (>= 4.0.0, < 6)
@@ -254,6 +262,7 @@ DEPENDENCIES
   mocha
   omniauth (= 1.3.1)
   omniauth-google-oauth2 (= 0.4.1)
+  omniauth-ldap
   omniauth-twitter (= 1.2.1)
   paperclip (~> 4.2)
   pg