Commit 5eb62fb9 authored by Yorick Peterse's avatar Yorick Peterse

Merge branch 'security-fj-diff-import-file-read-fix-11-8' into '11-8-stable'

Arbitrary file read via MergeRequestDiff

See merge request gitlab/gitlabhq!2951
parents 86363c20 a624cec9
......@@ -71,7 +71,7 @@ class MergeRequest < ActiveRecord::Base
serialize :merge_params, Hash # rubocop:disable Cop/ActiveRecordSerialize
after_create :ensure_merge_request_diff, unless: :importing?
after_create :ensure_merge_request_diff
after_update :clear_memoized_shas
after_update :reload_diff_if_branch_changed
after_save :ensure_metrics
......
......@@ -25,6 +25,8 @@ class MergeRequestDiff < ActiveRecord::Base
has_many :merge_request_diff_commits, -> { order(:merge_request_diff_id, :relative_order) }
validates :base_commit_sha, :head_commit_sha, :start_commit_sha, sha: true
state_machine :state, initial: :empty do
event :clean do
transition any => :without_files
......
# frozen_string_literal: true
class ShaValidator < ActiveModel::EachValidator
def validate_each(record, attribute, value)
return if value.blank? || value.match(/\A\h{40}\z/)
record.errors.add(attribute, 'is not a valid SHA')
end
end
---
title: Fix arbitrary file read via diffs during import
merge_request:
author:
type: security
......@@ -20,6 +20,17 @@ module Gitlab
create_target_branch unless branch_exists?(@merge_request.target_branch)
end
# The merge_request_diff associated with the current @merge_request might
# be invalid. Than means, when the @merge_request object is saved, the
# @merge_request.merge_request_diff won't. This can leave the merge request
# in an invalid state, because a merge request must have an associated
# merge request diff.
# In this change, if the associated merge request diff is invalid, we set
# it to nil. This change, in association with the after callback
# :ensure_merge_request_diff in the MergeRequest class, makes that
# when the merge request is going to be created and it doesn't have
# one, a default one will be generated.
@merge_request.merge_request_diff = nil unless @merge_request.merge_request_diff&.valid?
@merge_request
end
......
require 'rails_helper'
describe 'Merge request > User sees versions', :js do
let(:merge_request) { create(:merge_request, importing: true) }
let(:merge_request) do
create(:merge_request).tap do |mr|
mr.merge_request_diff.destroy
end
end
let(:project) { merge_request.source_project }
let(:user) { project.creator }
let!(:merge_request_diff1) { merge_request.merge_request_diffs.create(head_commit_sha: '6f6d7e7ed97bb5f0054f2b1df789b39ca89b6ff9') }
......
......@@ -41,4 +41,20 @@ describe Gitlab::ImportExport::MergeRequestParser do
expect(parsed_merge_request).to eq(merge_request)
end
context 'when the merge request has diffs' do
let(:merge_request) do
build(:merge_request, source_project: forked_project, target_project: project)
end
context 'when the diff is invalid' do
let(:merge_request_diff) { build(:merge_request_diff, merge_request: merge_request, base_commit_sha: 'foobar') }
it 'sets the diff to nil' do
expect(merge_request_diff).to be_invalid
expect(merge_request_diff.merge_request).to eq merge_request
expect(parsed_merge_request.merge_request_diff).to be_nil
end
end
end
end
......@@ -3,6 +3,18 @@ require 'spec_helper'
describe MergeRequestDiff do
let(:diff_with_commits) { create(:merge_request).merge_request_diff }
describe 'validations' do
subject { diff_with_commits }
it 'checks sha format of base_commit_sha, head_commit_sha and start_commit_sha' do
subject.base_commit_sha = subject.head_commit_sha = subject.start_commit_sha = 'foobar'
expect(subject.valid?).to be false
expect(subject.errors.count).to eq 3
expect(subject.errors).to all(include('is not a valid SHA'))
end
end
describe 'create new record' do
subject { diff_with_commits }
......@@ -78,7 +90,7 @@ describe MergeRequestDiff do
it 'returns persisted diffs if cannot compare with diff refs' do
expect(diff).to receive(:load_diffs).and_call_original
diff.update!(head_commit_sha: 'invalid-sha')
diff.update!(head_commit_sha: Digest::SHA1.hexdigest(SecureRandom.hex))
diff.diffs.diff_files
end
......
require 'spec_helper'
describe ShaValidator do
let(:validator) { described_class.new(attributes: [:base_commit_sha]) }
let(:merge_diff) { build(:merge_request_diff) }
subject { validator.validate_each(merge_diff, :base_commit_sha, value) }
context 'with empty value' do
let(:value) { nil }
it 'does not add any error if value is empty' do
subject
expect(merge_diff.errors).to be_empty
end
end
context 'with valid sha' do
let(:value) { Digest::SHA1.hexdigest(SecureRandom.hex) }
it 'does not add any error if value is empty' do
subject
expect(merge_diff.errors).to be_empty
end
end
context 'with invalid sha' do
let(:value) { 'foo' }
it 'adds error to the record' do
expect(merge_diff.errors).to be_empty
subject
expect(merge_diff.errors).not_to be_empty
end
end
end
......@@ -18,7 +18,7 @@ describe UpdateHeadPipelineForMergeRequestWorker do
context 'when merge request sha does not equal pipeline sha' do
before do
merge_request.merge_request_diff.update(head_commit_sha: 'different_sha')
merge_request.merge_request_diff.update(head_commit_sha: Digest::SHA1.hexdigest(SecureRandom.hex))
end
it 'does not update head pipeline' do
......
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