summaryrefslogtreecommitdiff
path: root/lib/gitlab/shell.rb
blob: 0fa17b3f559e3ead4e2c872d0734ca1a5be438e3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
# frozen_string_literal: true

# Gitaly note: SSH key operations are not part of Gitaly so will never be migrated.

require 'securerandom'

module Gitlab
  class Shell
    GITLAB_SHELL_ENV_VARS = %w(GIT_TERMINAL_PROMPT).freeze

    Error = Class.new(StandardError)

    class << self
      def secret_token
        @secret_token ||= begin
          File.read(Gitlab.config.gitlab_shell.secret_file).chomp
        end
      end

      def ensure_secret_token!
        return if File.exist?(File.join(Gitlab.config.gitlab_shell.path, '.gitlab_shell_secret'))

        generate_and_link_secret_token
      end

      def version_required
        @version_required ||= File.read(Rails.root
                                        .join('GITLAB_SHELL_VERSION')).strip
      end

      private

      # Create (if necessary) and link the secret token file
      def generate_and_link_secret_token
        secret_file = Gitlab.config.gitlab_shell.secret_file
        shell_path = Gitlab.config.gitlab_shell.path

        unless File.size?(secret_file)
          # Generate a new token of 16 random hexadecimal characters and store it in secret_file.
          @secret_token = SecureRandom.hex(16)
          File.write(secret_file, @secret_token)
        end

        link_path = File.join(shell_path, '.gitlab_shell_secret')
        if File.exist?(shell_path) && !File.exist?(link_path)
          FileUtils.symlink(secret_file, link_path)
        end
      end
    end

    # Convenience methods for initializing a new repository with a Project model.
    def create_project_repository(project)
      create_repository(project.repository_storage, project.disk_path, project.full_path)
    end

    def create_wiki_repository(project)
      create_repository(project.repository_storage, project.wiki.disk_path, project.wiki.full_path)
    end

    # Init new repository
    #
    # storage - the shard key
    # disk_path - project disk path
    # gl_project_path - project name
    #
    # Ex.
    #   create_repository("default", "path/to/gitlab-ci", "gitlab/gitlab-ci")
    #
    def create_repository(storage, disk_path, gl_project_path)
      relative_path = disk_path.dup
      relative_path << '.git' unless relative_path.end_with?('.git')

      # During creation of a repository, gl_repository may not be known
      # because that depends on a yet-to-be assigned project ID in the
      # database (e.g. project-1234), so for now it is blank.
      repository = Gitlab::Git::Repository.new(storage, relative_path, '', gl_project_path)
      wrapped_gitaly_errors { repository.gitaly_repository_client.create_repository }

      true
    rescue => err # Once the Rugged codes gets removes this can be improved
      Rails.logger.error("Failed to add repository #{storage}/#{disk_path}: #{err}") # rubocop:disable Gitlab/RailsLogger
      false
    end

    def import_wiki_repository(project, wiki_formatter)
      import_repository(project.repository_storage, wiki_formatter.disk_path, wiki_formatter.import_url, project.wiki.full_path)
    end

    def import_project_repository(project)
      import_repository(project.repository_storage, project.disk_path, project.import_url, project.full_path)
    end

    # Import repository
    #
    # storage - project's storage name
    # name - project disk path
    # url - URL to import from
    #
    # Ex.
    #   import_repository("nfs-file06", "gitlab/gitlab-ci", "https://gitlab.com/gitlab-org/gitlab-test.git")
    #
    def import_repository(storage, name, url, gl_project_path)
      if url.start_with?('.', '/')
        raise Error.new("don't use disk paths with import_repository: #{url.inspect}")
      end

      relative_path = "#{name}.git"
      cmd = GitalyGitlabProjects.new(storage, relative_path, gl_project_path)

      success = cmd.import_project(url, git_timeout)
      raise Error, cmd.output unless success

      success
    end

    # Move repository reroutes to mv_directory which is an alias for
    # mv_namespace. Given the underlying implementation is a move action,
    # indescriminate of what the folders might be.
    #
    # storage - project's storage path
    # path - project disk path
    # new_path - new project disk path
    #
    # Ex.
    #   mv_repository("/path/to/storage", "gitlab/gitlab-ci", "randx/gitlab-ci-new")
    def mv_repository(storage, path, new_path)
      return false if path.empty? || new_path.empty?

      !!mv_directory(storage, "#{path}.git", "#{new_path}.git")
    end

    # Fork repository to new path
    # source_project - forked-from Project
    # target_project - forked-to Project
    def fork_repository(source_project, target_project)
      forked_from_relative_path = "#{source_project.disk_path}.git"
      fork_args = [target_project.repository_storage, "#{target_project.disk_path}.git", target_project.full_path]

      GitalyGitlabProjects.new(source_project.repository_storage, forked_from_relative_path, source_project.full_path).fork_repository(*fork_args)
    end

    # Removes a repository from file system, using rm_diretory which is an alias
    # for rm_namespace. Given the underlying implementation removes the name
    # passed as second argument on the passed storage.
    #
    # storage - project's storage path
    # name - project disk path
    #
    # Ex.
    #   remove_repository("/path/to/storage", "gitlab/gitlab-ci")
    def remove_repository(storage, name)
      return false if name.empty?

      !!rm_directory(storage, "#{name}.git")
    rescue ArgumentError => e
      Rails.logger.warn("Repository does not exist: #{e} at: #{name}.git") # rubocop:disable Gitlab/RailsLogger
      false
    end

    # Add new key to authorized_keys
    #
    # Ex.
    #   add_key("key-42", "sha-rsa ...")
    #
    def add_key(key_id, key_content)
      return unless self.authorized_keys_enabled?

      if shell_out_for_gitlab_keys?
        gitlab_shell_fast_execute([
          gitlab_shell_keys_path,
          'add-key',
          key_id,
          strip_key(key_content)
        ])
      else
        gitlab_authorized_keys.add_key(key_id, key_content)
      end
    end

    # Batch-add keys to authorized_keys
    #
    # Ex.
    #   batch_add_keys(Key.all)
    def batch_add_keys(keys)
      return unless self.authorized_keys_enabled?

      if shell_out_for_gitlab_keys?
        begin
          IO.popen("#{gitlab_shell_keys_path} batch-add-keys", 'w') do |io|
            add_keys_to_io(keys, io)
          end

          $?.success?
        rescue Error
          false
        end
      else
        gitlab_authorized_keys.batch_add_keys(keys)
      end
    end

    # Remove ssh key from authorized_keys
    #
    # Ex.
    #   remove_key("key-342")
    #
    def remove_key(id, _ = nil)
      return unless self.authorized_keys_enabled?

      if shell_out_for_gitlab_keys?
        gitlab_shell_fast_execute([gitlab_shell_keys_path, 'rm-key', id])
      else
        gitlab_authorized_keys.rm_key(id)
      end
    end

    # Remove all ssh keys from gitlab shell
    #
    # Ex.
    #   remove_all_keys
    #
    def remove_all_keys
      return unless self.authorized_keys_enabled?

      if shell_out_for_gitlab_keys?
        gitlab_shell_fast_execute([gitlab_shell_keys_path, 'clear'])
      else
        gitlab_authorized_keys.clear
      end
    end

    # Remove ssh keys from gitlab shell that are not in the DB
    #
    # Ex.
    #   remove_keys_not_found_in_db
    #
    # rubocop: disable CodeReuse/ActiveRecord
    def remove_keys_not_found_in_db
      return unless self.authorized_keys_enabled?

      Rails.logger.info("Removing keys not found in DB") # rubocop:disable Gitlab/RailsLogger

      batch_read_key_ids do |ids_in_file|
        ids_in_file.uniq!
        keys_in_db = Key.where(id: ids_in_file)

        next unless ids_in_file.size > keys_in_db.count # optimization

        ids_to_remove = ids_in_file - keys_in_db.pluck(:id)
        ids_to_remove.each do |id|
          Rails.logger.info("Removing key-#{id} not found in DB") # rubocop:disable Gitlab/RailsLogger
          remove_key("key-#{id}")
        end
      end
    end
    # rubocop: enable CodeReuse/ActiveRecord

    # Add empty directory for storing repositories
    #
    # Ex.
    #   add_namespace("default", "gitlab")
    #
    def add_namespace(storage, name)
      # https://gitlab.com/gitlab-org/gitlab-ce/issues/58012
      Gitlab::GitalyClient.allow_n_plus_1_calls do
        Gitlab::GitalyClient::NamespaceService.new(storage).add(name)
      end
    rescue GRPC::InvalidArgument => e
      raise ArgumentError, e.message
    end

    # Remove directory from repositories storage
    # Every repository inside this directory will be removed too
    #
    # Ex.
    #   rm_namespace("default", "gitlab")
    #
    def rm_namespace(storage, name)
      Gitlab::GitalyClient::NamespaceService.new(storage).remove(name)
    rescue GRPC::InvalidArgument => e
      raise ArgumentError, e.message
    end
    alias_method :rm_directory, :rm_namespace

    # Move namespace directory inside repositories storage
    #
    # Ex.
    #   mv_namespace("/path/to/storage", "gitlab", "gitlabhq")
    #
    def mv_namespace(storage, old_name, new_name)
      Gitlab::GitalyClient::NamespaceService.new(storage).rename(old_name, new_name)
    rescue GRPC::InvalidArgument => e
      Gitlab::Sentry.track_acceptable_exception(e, extra: { old_name: old_name, new_name: new_name, storage: storage })

      false
    end
    alias_method :mv_directory, :mv_namespace # Note: ShellWorker uses this alias

    def url_to_repo(path)
      Gitlab.config.gitlab_shell.ssh_path_prefix + "#{path}.git"
    end

    # Return GitLab shell version
    def version
      gitlab_shell_version_file = "#{gitlab_shell_path}/VERSION"

      if File.readable?(gitlab_shell_version_file)
        File.read(gitlab_shell_version_file).chomp
      end
    end

    # Check if such directory exists in repositories.
    #
    # Usage:
    #   exists?(storage, 'gitlab')
    #   exists?(storage, 'gitlab/cookies.git')
    #
    # rubocop: disable CodeReuse/ActiveRecord
    def exists?(storage, dir_name)
      Gitlab::GitalyClient::NamespaceService.new(storage).exists?(dir_name)
    end
    # rubocop: enable CodeReuse/ActiveRecord

    def hooks_path
      File.join(gitlab_shell_path, 'hooks')
    end

    protected

    def gitlab_shell_path
      File.expand_path(Gitlab.config.gitlab_shell.path)
    end

    def gitlab_shell_user_home
      File.expand_path("~#{Gitlab.config.gitlab_shell.ssh_user}")
    end

    def full_path(storage, dir_name)
      raise ArgumentError.new("Directory name can't be blank") if dir_name.blank?

      File.join(Gitlab.config.repositories.storages[storage].legacy_disk_path, dir_name)
    end

    def gitlab_shell_projects_path
      File.join(gitlab_shell_path, 'bin', 'gitlab-projects')
    end

    def gitlab_shell_keys_path
      File.join(gitlab_shell_path, 'bin', 'gitlab-keys')
    end

    def authorized_keys_enabled?
      # Return true if nil to ensure the authorized_keys methods work while
      # fixing the authorized_keys file during migration.
      return true if Gitlab::CurrentSettings.current_application_settings.authorized_keys_enabled.nil?

      Gitlab::CurrentSettings.current_application_settings.authorized_keys_enabled
    end

    private

    def shell_out_for_gitlab_keys?
      Gitlab.config.gitlab_shell.authorized_keys_file.blank?
    end

    def gitlab_shell_fast_execute(cmd)
      output, status = gitlab_shell_fast_execute_helper(cmd)

      return true if status.zero?

      Rails.logger.error("gitlab-shell failed with error #{status}: #{output}") # rubocop:disable Gitlab/RailsLogger
      false
    end

    def gitlab_shell_fast_execute_raise_error(cmd, vars = {})
      output, status = gitlab_shell_fast_execute_helper(cmd, vars)

      raise Error, output unless status.zero?

      true
    end

    def gitlab_shell_fast_execute_helper(cmd, vars = {})
      vars.merge!(ENV.to_h.slice(*GITLAB_SHELL_ENV_VARS))

      # Don't pass along the entire parent environment to prevent gitlab-shell
      # from wasting I/O by searching through GEM_PATH
      Bundler.with_original_env { Popen.popen(cmd, nil, vars) }
    end

    def git_timeout
      Gitlab.config.gitlab_shell.git_timeout
    end

    def wrapped_gitaly_errors
      yield
    rescue GRPC::NotFound, GRPC::BadStatus => e
      # Old Popen code returns [Error, output] to the caller, so we
      # need to do the same here...
      raise Error, e
    end

    def gitlab_authorized_keys
      @gitlab_authorized_keys ||= Gitlab::AuthorizedKeys.new
    end

    def batch_read_key_ids(batch_size: 100, &block)
      return unless self.authorized_keys_enabled?

      if shell_out_for_gitlab_keys?
        IO.popen("#{gitlab_shell_keys_path} list-key-ids") do |key_id_stream|
          key_id_stream.lazy.each_slice(batch_size) do |lines|
            yield(lines.map { |l| l.chomp.to_i })
          end
        end
      else
        gitlab_authorized_keys.list_key_ids.lazy.each_slice(batch_size) do |key_ids|
          yield(key_ids)
        end
      end
    end

    def strip_key(key)
      key.split(/[ ]+/)[0, 2].join(' ')
    end

    def add_keys_to_io(keys, io)
      keys.each do |k|
        key = strip_key(k.key)

        raise Error.new("Invalid key: #{key.inspect}") if key.include?("\t") || key.include?("\n")

        io.puts("#{k.shell_id}\t#{key}")
      end
    end

    class GitalyGitlabProjects
      attr_reader :shard_name, :repository_relative_path, :output, :gl_project_path

      def initialize(shard_name, repository_relative_path, gl_project_path)
        @shard_name = shard_name
        @repository_relative_path = repository_relative_path
        @output = ''
        @gl_project_path = gl_project_path
      end

      def import_project(source, _timeout)
        raw_repository = Gitlab::Git::Repository.new(shard_name, repository_relative_path, nil, gl_project_path)

        Gitlab::GitalyClient::RepositoryService.new(raw_repository).import_repository(source)
        true
      rescue GRPC::BadStatus => e
        @output = e.message
        false
      end

      def fork_repository(new_shard_name, new_repository_relative_path, new_project_name)
        target_repository = Gitlab::Git::Repository.new(new_shard_name, new_repository_relative_path, nil, new_project_name)
        raw_repository = Gitlab::Git::Repository.new(shard_name, repository_relative_path, nil, gl_project_path)

        Gitlab::GitalyClient::RepositoryService.new(target_repository).fork_repository(raw_repository)
      rescue GRPC::BadStatus => e
        logger.error "fork-repository failed: #{e.message}"
        false
      end

      def logger
        Rails.logger # rubocop:disable Gitlab/RailsLogger
      end
    end
  end
end