commit signature with spec

5 files changed, 281 insertions, 2 deletions

diff --git a/app/models/commit.rb b/app/models/commit.rb
index b22aaa3c461..0d50a32d138 100644
--- a/app/models/commit.rb
+++ b/app/models/commit.rb
@@ -237,7 +237,7 @@ class Commit
   def signature
     return @signature if defined?(@signature)
 
-    sig, signed = @raw.extract_signature(project.repository.raw_repository)
+    sig, signed = @raw.signature(project.repository)
     if sig && signed
       GPGME::Crypto.new.verify(sig, signed_text: signed) do |sign|
         @signature = sign
diff --git a/lib/gitlab/git/commit.rb b/lib/gitlab/git/commit.rb
index d19f55c423b..4dcaff5e0a0 100644
--- a/lib/gitlab/git/commit.rb
+++ b/lib/gitlab/git/commit.rb
@@ -319,7 +319,12 @@ module Gitlab
         end
       end
 
-      def extract_signature(repo)
+      # Get the gpg signature of this commit.
+      #
+      # Ex.
+      #   commit.signature(repo)
+      #
+      def signature(repo)
         Rugged::Commit.extract_signature(repo.rugged, sha)
       end
 
diff --git a/spec/models/commit_spec.rb b/spec/models/commit_spec.rb
index 528b211c9d6..0fc00ab4f18 100644
--- a/spec/models/commit_spec.rb
+++ b/spec/models/commit_spec.rb
@@ -414,4 +414,44 @@ eos
       expect(described_class.valid_hash?('a' * 41)).to be false
     end
   end
+
+  describe '#signature' do
+    it 'returns nil if the commit is not signed' do
+      expect(commit.signature).to be_nil
+    end
+
+    context 'signed commit', :gpg do
+      it 'returns a valid signature if the public key is known' do
+        GPGME::Key.import(GpgHelpers.public_key)
+
+        raw_commit = double(:raw_commit, signature: [
+          GpgHelpers.signed_commit_signature,
+          GpgHelpers.signed_commit_base_data
+        ])
+        allow(raw_commit).to receive :save!
+
+        commit = create :commit,
+          git_commit: raw_commit,
+          project: project
+
+        expect(commit.signature).to be_a GPGME::Signature
+        expect(commit.signature.valid?).to be_truthy
+      end
+
+      it 'returns an invalid signature if the public commit is unknown', :gpg do
+        raw_commit = double(:raw_commit, signature: [
+          GpgHelpers.signed_commit_signature,
+          GpgHelpers.signed_commit_base_data
+        ])
+        allow(raw_commit).to receive :save!
+
+        commit = create :commit,
+          git_commit: raw_commit,
+          project: project
+
+        expect(commit.signature).to be_a GPGME::Signature
+        expect(commit.signature.valid?).to be_falsey
+      end
+    end
+  end
 end
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index e7329210896..6b4ec608efb 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -141,6 +141,18 @@ RSpec.configure do |config|
   config.around(:each, :postgresql) do |example|
     example.run if Gitlab::Database.postgresql?
   end
+
+  config.around(:each, :gpg) do |example|
+    Dir.mktmpdir do |dir|
+      original_dir = GPGME::Engine.dirinfo('homedir')
+
+      GPGME::Engine.home_dir = dir
+
+      example.run
+
+      GPGME::Engine.home_dir = original_dir
+    end
+  end
 end
 
 FactoryGirl::SyntaxRunner.class_eval do
diff --git a/spec/support/gpg_helpers.rb b/spec/support/gpg_helpers.rb
new file mode 100644
index 00000000000..3b50d831b00
--- /dev/null
+++ b/spec/support/gpg_helpers.rb
@@ -0,0 +1,222 @@
+module GpgHelpers
+  extend self
+
+  def signed_commit_signature
+    <<~SIGNATURE
+      -----BEGIN PGP SIGNATURE-----
+      Version: GnuPG v1
+
+      iQEcBAABAgAGBQJYpIi9AAoJEMcorxCXLpfAZZIH/R/nhcC4s0j6nqAsi9Kbc4DX
+      TGZyfjed6puWzqnT90Vy+WyUC7FjWJpkuOKQz+NQD9JcBMRp/OC0GtkNz4djv1se
+      Nup29qWd+Fg2XGEBakTxAo2e9cg38a2rGEIL6V8i+tYAhDt5OyLdzD/XsF0vt02E
+      ZikSvV02c6ByrjPq37ZdOgnk1xJrS1NM0Sn4B7L3cAz6TYb1OvyG1Z4HnMWgTBHy
+      e/uKLPRYhx7a4D4TEt4/JWN3sb0VnaToG623EdJ1APF/MK9Es+H7YfgBsyu18nss
+      705F+PZ2vx/1b9z5dLc/jQNf+k9vQH4uhmOFwUJnuQ/qB4/3H/UyLH/HfomK7Zk=
+      =fzCF
+      -----END PGP SIGNATURE-----
+    SIGNATURE
+  end
+
+  def signed_commit_base_data
+    <<~SIGNEDDATA
+      tree ed60cfd202644fda1abaf684e7d965052db18c13
+      parent 4ded8b5ce09d2b665e5893945b29d8d626691086
+      author Alexis Reigel <mail@koffeinfrei.org> 1487177917 +0100
+      committer Alexis Reigel <mail@koffeinfrei.org> 1487177917 +0100
+
+      signed commit, verified key/email
+    SIGNEDDATA
+  end
+
+  def public_key
+    <<~PUBLICKEY
+      -----BEGIN PGP PUBLIC KEY BLOCK-----
+      Version: GnuPG v1
+
+      mQENBFMOSOgBCADFCYxmnXFbrDhfvlf03Q/bQuT+nZu46BFGbo7XkUjDowFXJQhP
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+      -----END PGP PUBLIC KEY BLOCK-----
+    PUBLICKEY
+  end
+end