4 files changed, 24 insertions, 1 deletions
diff --git a/users/config/locales/en.yml b/users/config/locales/en.yml
index 1aa7005..62f822c 100644
--- a/users/config/locales/en.yml
+++ b/users/config/locales/en.yml
@@ -12,6 +12,7 @@ en:
   change_password: "Change Password"
   login_message: "Please log in with your account."
   invalid_user_pass: "Not a valid username/password combination"
+  invalid_ephemeral: "Invalid random key used. This looked like an attempt to hack the site to us. If it wasn't please contact support so we can look into the issue."
   all_strategies_failed: "Could not understand your login attempt. Please first send your login and a SRP ephemeral value A and then send the client_auth in the same session (using cookies)."
   update_login_and_password: "Update Login and Password"
   destroy_my_account: "Destroy my account"
diff --git a/users/leap_web_users.gemspec b/users/leap_web_users.gemspec
index d33328a..7d1f220 100644
--- a/users/leap_web_users.gemspec
+++ b/users/leap_web_users.gemspec
@@ -17,6 +17,6 @@ Gem::Specification.new do |s|
 
   s.add_dependency "leap_web_core", LeapWeb::VERSION
 
-  s.add_dependency "ruby-srp", "~> 0.2.0"
+  s.add_dependency "ruby-srp", "~> 0.2.1"
   s.add_dependency "rails_warden"
 end
diff --git a/users/lib/warden/strategies/secure_remote_password.rb b/users/lib/warden/strategies/secure_remote_password.rb
index 2c681be..4688fcd 100644
--- a/users/lib/warden/strategies/secure_remote_password.rb
+++ b/users/lib/warden/strategies/secure_remote_password.rb
@@ -49,6 +49,8 @@ module Warden
         else
           fail! :base => 'invalid_user_pass'
         end
+      rescue SRP::InvalidEphemeral
+        fail!(:base => "invalid_ephemeral")
       end
 
       def json_response(object)
diff --git a/users/test/integration/browser/account_test.rb b/users/test/integration/browser/account_test.rb
index ce63baf..c65c491 100644
--- a/users/test/integration/browser/account_test.rb
+++ b/users/test/integration/browser/account_test.rb
@@ -20,4 +20,24 @@ class AccountTest < BrowserIntegrationTest
     assert_equal '/', current_path
   end
 
+  # trying to seed an invalid A for srp login
+  test "detects attempt to circumvent SRP" do
+    user = FactoryGirl.create :user
+    visit '/sessions/new'
+    fill_in 'Username', with: user.login
+    fill_in 'Password', with: "password"
+    inject_malicious_js
+    click_on 'Log In'
+    assert !page.has_content?("Welcome")
+    assert page.has_content?("Invalid random key")
+  end
+
+  def inject_malicious_js
+    page.execute_script <<-EOJS
+      var calc = new srp.Calculate();
+      calc.A = function(_a) {return "00";};
+      calc.S = calc.A;
+      srp.session = new srp.Session(null, calc);
+    EOJS
+  end
 end