diff --git a/GITLAB_SHELL_VERSION b/GITLAB_SHELL_VERSION
index 2bf1c1ccf363acd53eaf92ef33a7f11f5f4557c2..197c4d5c2d7c724b4cd0048f4e3574bb3fa5c8db 100644
--- a/GITLAB_SHELL_VERSION
+++ b/GITLAB_SHELL_VERSION
@@ -1 +1 @@
-2.3.1
+2.4.0
diff --git a/lib/api/internal.rb b/lib/api/internal.rb
index ebf2296097db666be730c3df1814938033cdcc6a..1648834f034b77b9884c8c938799a8e359a5d1c6 100644
--- a/lib/api/internal.rb
+++ b/lib/api/internal.rb
@@ -43,7 +43,7 @@ module API
 
         return false unless actor
 
-        access.allowed?(
+        access.check(
           actor,
           params[:action],
           project,
diff --git a/lib/gitlab/backend/grack_auth.rb b/lib/gitlab/backend/grack_auth.rb
index df1461a45c988e21cb485adab198eb062ac8e790..762639414e0e99dede44601d60a03648eb8e8fbb 100644
--- a/lib/gitlab/backend/grack_auth.rb
+++ b/lib/gitlab/backend/grack_auth.rb
@@ -80,7 +80,7 @@ module Grack
       case git_cmd
       when *Gitlab::GitAccess::DOWNLOAD_COMMANDS
         if user
-          Gitlab::GitAccess.new.download_allowed?(user, project)
+          Gitlab::GitAccess.new.download_access_check(user, project).allowed?
         elsif project.public?
           # Allow clone/fetch for public projects
           true
diff --git a/lib/gitlab/git_access.rb b/lib/gitlab/git_access.rb
index 129881060d5ce4e14e36ca43c879ca4c8889953f..3452240dad8648cc117b8ff286cf0454e7963b00 100644
--- a/lib/gitlab/git_access.rb
+++ b/lib/gitlab/git_access.rb
@@ -5,61 +5,60 @@ module Gitlab
 
     attr_reader :params, :project, :git_cmd, :user
 
-    def allowed?(actor, cmd, project, changes = nil)
+    def check(actor, cmd, project, changes = nil)
       case cmd
       when *DOWNLOAD_COMMANDS
         if actor.is_a? User
-          download_allowed?(actor, project)
+          download_access_check(actor, project)
         elsif actor.is_a? DeployKey
           actor.projects.include?(project)
         elsif actor.is_a? Key
-          download_allowed?(actor.user, project)
+          download_access_check(actor.user, project)
         else
           raise 'Wrong actor'
         end
       when *PUSH_COMMANDS
         if actor.is_a? User
-          push_allowed?(actor, project, changes)
+          push_access_check(actor, project, changes)
         elsif actor.is_a? DeployKey
-          # Deploy key not allowed to push
-          return false
+          return build_status_object(false, "Deploy key not allowed to push")
         elsif actor.is_a? Key
-          push_allowed?(actor.user, project, changes)
+          push_access_check(actor.user, project, changes)
         else
           raise 'Wrong actor'
         end
       else
-        false
+        return build_status_object(false, "Wrong command")
       end
     end
 
-    def download_allowed?(user, project)
-      if user && user_allowed?(user)
-        user.can?(:download_code, project)
+    def download_access_check(user, project)
+      if user && user_allowed?(user) && user.can?(:download_code, project)
+        build_status_object(true)
       else
-        false
+        build_status_object(false, "You don't have access")
       end
     end
 
-    def push_allowed?(user, project, changes)
-      return false unless user && user_allowed?(user)
-      return true if changes.blank?
+    def push_access_check(user, project, changes)
+      return build_status_object(false, "You don't have access") unless user && user_allowed?(user)
+      return build_status_object(true) if changes.blank?
 
       changes = changes.lines if changes.kind_of?(String)
 
       # Iterate over all changes to find if user allowed all of them to be applied
       changes.each do |change|
-        unless change_allowed?(user, project, change)
+        status = change_access_check(user, project, change)
+        unless status.allowed?
           # If user does not have access to make at least one change - cancel all push
-          return false
+          return status
         end
       end
 
-      # If user has access to make all changes
-      true
+      return build_status_object(true)
     end
 
-    def change_allowed?(user, project, change)
+    def change_access_check(user, project, change)
       oldrev, newrev, ref = change.split(' ')
 
       action = if project.protected_branch?(branch_name(ref))
@@ -79,7 +78,11 @@ module Gitlab
                  :push_code
                end
 
-      user.can?(action, project)
+      if user.can?(action, project)
+        build_status_object(true)
+      else
+        build_status_object(false, "You don't have permission")
+      end
     end
 
     def forced_push?(project, oldrev, newrev)
@@ -116,5 +119,11 @@ module Gitlab
         nil
       end
     end
+
+    protected
+
+    def build_status_object(status, message = '')
+      GitAccessStatus.new(status, message)
+    end
   end
 end
diff --git a/lib/gitlab/git_access_status.rb b/lib/gitlab/git_access_status.rb
new file mode 100644
index 0000000000000000000000000000000000000000..3d451ecebee0480a78b21cc79378ad1932e35ebc
--- /dev/null
+++ b/lib/gitlab/git_access_status.rb
@@ -0,0 +1,15 @@
+module Gitlab
+  class GitAccessStatus
+    attr_accessor :status, :message
+    alias_method :allowed?, :status
+
+    def initialize(status, message = '')
+      @status = status
+      @message = message
+    end
+
+    def to_json
+      {status: @status, message: @message}.to_json
+    end
+  end
+end
\ No newline at end of file
diff --git a/lib/gitlab/git_access_wiki.rb b/lib/gitlab/git_access_wiki.rb
index 9f0eb3be20f5ed85ef0f16a5a0ea68601999714f..a2177c8d5480865789562071f59e4f58cd3b3a87 100644
--- a/lib/gitlab/git_access_wiki.rb
+++ b/lib/gitlab/git_access_wiki.rb
@@ -1,7 +1,11 @@
 module Gitlab
   class GitAccessWiki < GitAccess
-    def change_allowed?(user, project, change)
-      user.can?(:write_wiki, project)
+    def change_access_check(user, project, change)
+      if user.can?(:write_wiki, project)
+        build_status_object(true)
+      else
+        build_status_object(false, "You don't have access")
+      end
     end
   end
 end
diff --git a/spec/lib/gitlab/git_access_spec.rb b/spec/lib/gitlab/git_access_spec.rb
index fe0a6bbdabb2d951025c024b0f2f763da67ca1f2..1addba55787e4c65e6497e6f410d946a226738ce 100644
--- a/spec/lib/gitlab/git_access_spec.rb
+++ b/spec/lib/gitlab/git_access_spec.rb
@@ -5,14 +5,14 @@ describe Gitlab::GitAccess do
   let(:project) { create(:project) }
   let(:user) { create(:user) }
 
-  describe 'download_allowed?' do
+  describe 'download_access_check' do
     describe 'master permissions' do
       before { project.team << [user, :master] }
 
       context 'pull code' do
-        subject { access.download_allowed?(user, project) }
+        subject { access.download_access_check(user, project) }
 
-        it { should be_true }
+        it { subject.allowed?.should be_true }
       end
     end
 
@@ -20,9 +20,9 @@ describe Gitlab::GitAccess do
       before { project.team << [user, :guest] }
 
       context 'pull code' do
-        subject { access.download_allowed?(user, project) }
+        subject { access.download_access_check(user, project) }
 
-        it { should be_false }
+        it { subject.allowed?.should be_false }
       end
     end
 
@@ -33,22 +33,22 @@ describe Gitlab::GitAccess do
       end
 
       context 'pull code' do
-        subject { access.download_allowed?(user, project) }
+        subject { access.download_access_check(user, project) }
 
-        it { should be_false }
+        it { subject.allowed?.should be_false }
       end
     end
 
     describe 'without acccess to project' do
       context 'pull code' do
-        subject { access.download_allowed?(user, project) }
+        subject { access.download_access_check(user, project) }
 
-        it { should be_false }
+        it { subject.allowed?.should be_false }
       end
     end
   end
 
-  describe 'push_allowed?' do
+  describe 'push_access_check' do
     def protect_feature_branch
       create(:protected_branch, name: 'feature', project: project)
     end
@@ -117,9 +117,9 @@ describe Gitlab::GitAccess do
 
         permissions_matrix[role].each do |action, allowed|
           context action do
-            subject { access.push_allowed?(user, project, changes[action]) }
+            subject { access.push_access_check(user, project, changes[action]) }
 
-            it { should allowed ? be_true : be_false }
+            it { subject.allowed?.should allowed ? be_true : be_false }
           end
         end
       end
diff --git a/spec/lib/gitlab/git_access_wiki_spec.rb b/spec/lib/gitlab/git_access_wiki_spec.rb
index ed5785b31e6828d6514d96634fb9032638f4dd1a..4ff45c0c6165599a378ce43ba8ea66277e205526 100644
--- a/spec/lib/gitlab/git_access_wiki_spec.rb
+++ b/spec/lib/gitlab/git_access_wiki_spec.rb
@@ -11,9 +11,9 @@ describe Gitlab::GitAccessWiki do
       project.team << [user, :developer]
     end
 
-    subject { access.push_allowed?(user, project, changes) }
+    subject { access.push_access_check(user, project, changes) }
 
-    it { should be_true }
+    it { subject.allowed?.should be_true }
   end
 
   def changes
diff --git a/spec/requests/api/internal_spec.rb b/spec/requests/api/internal_spec.rb
index 677b14940414b75d501b6e24b81ebf2b9fe5d618..53b7808d4c3be073f56dfdea18f036905bbcad41 100644
--- a/spec/requests/api/internal_spec.rb
+++ b/spec/requests/api/internal_spec.rb
@@ -37,7 +37,7 @@ describe API::API, api: true  do
           pull(key, project)
 
           response.status.should == 200
-          response.body.should == 'true'
+          JSON.parse(response.body)["status"].should be_true
         end
       end
 
@@ -46,7 +46,7 @@ describe API::API, api: true  do
           push(key, project)
 
           response.status.should == 200
-          response.body.should == 'true'
+          JSON.parse(response.body)["status"].should be_true
         end
       end
     end
@@ -61,7 +61,7 @@ describe API::API, api: true  do
           pull(key, project)
 
           response.status.should == 200
-          response.body.should == 'false'
+          JSON.parse(response.body)["status"].should be_false
         end
       end
 
@@ -70,7 +70,7 @@ describe API::API, api: true  do
           push(key, project)
 
           response.status.should == 200
-          response.body.should == 'false'
+          JSON.parse(response.body)["status"].should be_false
         end
       end
     end
@@ -87,7 +87,7 @@ describe API::API, api: true  do
           pull(key, personal_project)
 
           response.status.should == 200
-          response.body.should == 'false'
+          JSON.parse(response.body)["status"].should be_false
         end
       end
 
@@ -96,7 +96,7 @@ describe API::API, api: true  do
           push(key, personal_project)
 
           response.status.should == 200
-          response.body.should == 'false'
+          JSON.parse(response.body)["status"].should be_false
         end
       end
     end
@@ -114,7 +114,7 @@ describe API::API, api: true  do
           pull(key, project)
 
           response.status.should == 200
-          response.body.should == 'true'
+          JSON.parse(response.body)["status"].should be_true
         end
       end
 
@@ -123,7 +123,7 @@ describe API::API, api: true  do
           push(key, project)
 
           response.status.should == 200
-          response.body.should == 'false'
+          JSON.parse(response.body)["status"].should be_false
         end
       end
     end