Merge branch 'fix-api-mr-permissions' into 'security'

Ensure that only privileged users can access merge requests in the API

See merge request !2053

5 files changed, 21 insertions, 24 deletions

diff --git a/lib/api/helpers.rb b/lib/api/helpers.rb
index 49c5f0652ab..a1d7b323f4f 100644
--- a/lib/api/helpers.rb
+++ b/lib/api/helpers.rb
@@ -90,6 +90,12 @@ module API
       MergeRequestsFinder.new(current_user, project_id: user_project.id).find(id)
     end
 
+    def find_merge_request_with_access(id, access_level = :read_merge_request)
+      merge_request = user_project.merge_requests.find(id)
+      authorize! access_level, merge_request
+      merge_request
+    end
+
     def authenticate!
       unauthorized! unless current_user
     end
diff --git a/lib/api/merge_request_diffs.rb b/lib/api/merge_request_diffs.rb
index 07435d78468..bc3d69f6904 100644
--- a/lib/api/merge_request_diffs.rb
+++ b/lib/api/merge_request_diffs.rb
@@ -15,10 +15,8 @@ module API
       end
 
       get ":id/merge_requests/:merge_request_id/versions" do
-        merge_request = user_project.merge_requests.
-          find(params[:merge_request_id])
+        merge_request = find_merge_request_with_access(params[:merge_request_id])
 
-        authorize! :read_merge_request, merge_request
         present merge_request.merge_request_diffs, with: Entities::MergeRequestDiff
       end
 
@@ -34,10 +32,8 @@ module API
       end
 
       get ":id/merge_requests/:merge_request_id/versions/:version_id" do
-        merge_request = user_project.merge_requests.
-          find(params[:merge_request_id])
+        merge_request = find_merge_request_with_access(params[:merge_request_id])
 
-        authorize! :read_merge_request, merge_request
         present merge_request.merge_request_diffs.find(params[:version_id]), with: Entities::MergeRequestDiffFull
       end
     end
diff --git a/lib/api/merge_requests.rb b/lib/api/merge_requests.rb
index e77af4b7a0d..7ffb38e62da 100644
--- a/lib/api/merge_requests.rb
+++ b/lib/api/merge_requests.rb
@@ -118,8 +118,8 @@ module API
           success Entities::MergeRequest
         end
         get path do
-          merge_request = find_project_merge_request(params[:merge_request_id])
-          authorize! :read_merge_request, merge_request
+          merge_request = find_merge_request_with_access(params[:merge_request_id])
+
           present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         end
 
@@ -127,8 +127,8 @@ module API
           success Entities::RepoCommit
         end
         get "#{path}/commits" do
-          merge_request = find_project_merge_request(params[:merge_request_id])
-          authorize! :read_merge_request, merge_request
+          merge_request = find_merge_request_with_access(params[:merge_request_id])
+
           present merge_request.commits, with: Entities::RepoCommit
         end
 
@@ -136,8 +136,8 @@ module API
           success Entities::MergeRequestChanges
         end
         get "#{path}/changes" do
-          merge_request = find_project_merge_request(params[:merge_request_id])
-          authorize! :read_merge_request, merge_request
+          merge_request = find_merge_request_with_access(params[:merge_request_id])
+
           present merge_request, with: Entities::MergeRequestChanges, current_user: current_user
         end
 
@@ -155,8 +155,7 @@ module API
                           :remove_source_branch
         end
         put path do
-          merge_request = find_project_merge_request(params.delete(:merge_request_id))
-          authorize! :update_merge_request, merge_request
+          merge_request = find_merge_request_with_access(params.delete(:merge_request_id), :update_merge_request)
 
           mr_params = declared_params(include_missing: false)
           mr_params[:force_remove_source_branch] = mr_params.delete(:remove_source_branch) if mr_params[:remove_source_branch].present?
@@ -235,10 +234,7 @@ module API
           use :pagination
         end
         get "#{path}/comments" do
-          merge_request = find_project_merge_request(params[:merge_request_id])
-
-          authorize! :read_merge_request, merge_request
-
+          merge_request = find_merge_request_with_access(params[:merge_request_id])
           present paginate(merge_request.notes.fresh), with: Entities::MRNote
         end
 
@@ -250,8 +246,7 @@ module API
           requires :note, type: String, desc: 'The text of the comment'
         end
         post "#{path}/comments" do
-          merge_request = find_project_merge_request(params[:merge_request_id])
-          authorize! :create_note, merge_request
+          merge_request = find_merge_request_with_access(params[:merge_request_id], :create_note)
 
           opts = {
             note: params[:note],
@@ -275,7 +270,7 @@ module API
           use :pagination
         end
         get "#{path}/closes_issues" do
-          merge_request = find_project_merge_request(params[:merge_request_id])
+          merge_request = find_merge_request_with_access(params[:merge_request_id])
           issues = ::Kaminari.paginate_array(merge_request.closes_issues(current_user))
           present paginate(issues), with: issue_entity(user_project), current_user: current_user
         end
diff --git a/lib/api/subscriptions.rb b/lib/api/subscriptions.rb
index 10749b34004..e11d7537cc9 100644
--- a/lib/api/subscriptions.rb
+++ b/lib/api/subscriptions.rb
@@ -3,8 +3,8 @@ module API
     before { authenticate! }
 
     subscribable_types = {
-      'merge_request' => proc { |id| user_project.merge_requests.find(id) },
-      'merge_requests' => proc { |id| user_project.merge_requests.find(id) },
+      'merge_request' => proc { |id| find_merge_request_with_access(id, :update_merge_request) },
+      'merge_requests' => proc { |id| find_merge_request_with_access(id, :update_merge_request) },
       'issues' => proc { |id| find_project_issue(id) },
       'labels' => proc { |id| find_project_label(id) },
     }
diff --git a/lib/api/todos.rb b/lib/api/todos.rb
index ed8f48aa1e3..9bd077263a7 100644
--- a/lib/api/todos.rb
+++ b/lib/api/todos.rb
@@ -5,7 +5,7 @@ module API
     before { authenticate! }
 
     ISSUABLE_TYPES = {
-      'merge_requests' => ->(id) { user_project.merge_requests.find(id) },
+      'merge_requests' => ->(id) { find_merge_request_with_access(id) },
       'issues' => ->(id) { find_project_issue(id) }
     }