Merge branch 'rs-alphanumeric-ssh-params' into 'security-9-4'

Ensure user and hostnames begin with an alnum character in UrlBlocker

See merge request !2138

1 files changed, 34 insertions, 0 deletions

diff --git a/spec/lib/gitlab/url_blocker_spec.rb b/spec/lib/gitlab/url_blocker_spec.rb
index f5b4882815f..f18823b61ef 100644
--- a/spec/lib/gitlab/url_blocker_spec.rb
+++ b/spec/lib/gitlab/url_blocker_spec.rb
@@ -20,6 +20,34 @@ describe Gitlab::UrlBlocker do
       expect(described_class.blocked_url?('https://gitlab.com:25/foo/foo.git')).to be true
     end
 
+    it 'returns true for a non-alphanumeric hostname' do
+      stub_resolv
+
+      aggregate_failures do
+        expect(described_class).to be_blocked_url('ssh://-oProxyCommand=whoami/a')
+
+        # The leading character here is a Unicode "soft hyphen"
+        expect(described_class).to be_blocked_url('ssh://­oProxyCommand=whoami/a')
+
+        # Unicode alphanumerics are allowed
+        expect(described_class).not_to be_blocked_url('ssh://ğitlab.com/a')
+      end
+    end
+
+    it 'returns true for a non-alphanumeric username' do
+      stub_resolv
+
+      aggregate_failures do
+        expect(described_class).to be_blocked_url('ssh://-oProxyCommand=whoami@example.com/a')
+
+        # The leading character here is a Unicode "soft hyphen"
+        expect(described_class).to be_blocked_url('ssh://­oProxyCommand=whoami@example.com/a')
+
+        # Unicode alphanumerics are allowed
+        expect(described_class).not_to be_blocked_url('ssh://ğitlab@example.com/a')
+      end
+    end
+
     it 'returns true for invalid URL' do
       expect(described_class.blocked_url?('http://:8080')).to be true
     end
@@ -28,4 +56,10 @@ describe Gitlab::UrlBlocker do
       expect(described_class.blocked_url?('https://gitlab.com/foo/foo.git')).to be false
     end
   end
+
+  # Resolv does not support resolving UTF-8 domain names
+  # See https://bugs.ruby-lang.org/issues/4270
+  def stub_resolv
+    allow(Resolv).to receive(:getaddresses).and_return([])
+  end
 end