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
# Check a user's access to perform a git action. All public methods in this
# class return an instance of `GitlabAccessStatus`
module Gitlab
class GitAccess
include Gitlab::Utils::StrongMemoize
UnauthorizedError = Class.new(StandardError)
NotFoundError = Class.new(StandardError)
ProjectCreationError = Class.new(StandardError)
ProjectMovedError = Class.new(NotFoundError)
ERROR_MESSAGES = {
upload: 'You are not allowed to upload code for this project.',
download: 'You are not allowed to download code from this project.',
auth_upload: 'You are not allowed to upload code.',
auth_download: 'You are not allowed to download code.',
deploy_key_upload: 'This deploy key does not have write access to this project.',
no_repo: 'A repository for this project does not exist yet.',
project_not_found: 'The project you were looking for could not be found.',
account_blocked: 'Your account has been blocked.',
command_not_allowed: "The command you're trying to execute is not allowed.",
upload_pack_disabled_over_http: 'Pulling over HTTP is not allowed.',
receive_pack_disabled_over_http: 'Pushing over HTTP is not allowed.',
read_only: 'The repository is temporarily read-only. Please try again later.',
cannot_push_to_read_only: "You can't push code to a read-only GitLab instance."
}.freeze
DOWNLOAD_COMMANDS = %w{ git-upload-pack git-upload-archive }.freeze
PUSH_COMMANDS = %w{ git-receive-pack }.freeze
ALL_COMMANDS = DOWNLOAD_COMMANDS + PUSH_COMMANDS
attr_reader :actor, :project, :protocol, :authentication_abilities, :namespace_path, :project_path, :redirected_path
def initialize(actor, project, protocol, authentication_abilities:, namespace_path: nil, project_path: nil, redirected_path: nil)
@actor = actor
@project = project
@protocol = protocol
@authentication_abilities = authentication_abilities
@namespace_path = namespace_path
@project_path = project_path
@redirected_path = redirected_path
end
def check(cmd, changes)
check_protocol!
check_valid_actor!
check_active_user!
check_authentication_abilities!(cmd)
check_command_disabled!(cmd)
check_command_existence!(cmd)
check_db_accessibility!(cmd)
ensure_project_on_push!(cmd, changes)
check_project_accessibility!
check_project_moved!
check_repository_existence!
case cmd
when *DOWNLOAD_COMMANDS
check_download_access!
when *PUSH_COMMANDS
check_push_access!(changes)
end
true
end
def guest_can_download_code?
Guest.can?(:download_code, project)
end
def user_can_download_code?
authentication_abilities.include?(:download_code) && user_access.can_do_action?(:download_code)
end
def build_can_download_code?
authentication_abilities.include?(:build_download_code) && user_access.can_do_action?(:build_download_code)
end
def protocol_allowed?
Gitlab::ProtocolAccess.allowed?(protocol)
end
private
def check_valid_actor!
return unless actor.is_a?(Key)
unless actor.valid?
raise UnauthorizedError, "Your SSH key #{actor.errors[:key].first}."
end
end
def check_protocol!
unless protocol_allowed?
raise UnauthorizedError, "Git access over #{protocol.upcase} is not allowed"
end
end
def check_active_user!
return if deploy_key?
if user && !user_access.allowed?
raise UnauthorizedError, ERROR_MESSAGES[:account_blocked]
end
end
def check_authentication_abilities!(cmd)
case cmd
when *DOWNLOAD_COMMANDS
unless authentication_abilities.include?(:download_code) || authentication_abilities.include?(:build_download_code)
raise UnauthorizedError, ERROR_MESSAGES[:auth_download]
end
when *PUSH_COMMANDS
unless authentication_abilities.include?(:push_code)
raise UnauthorizedError, ERROR_MESSAGES[:auth_upload]
end
end
end
def check_project_accessibility!
if project.blank? || !can_read_project?
raise NotFoundError, ERROR_MESSAGES[:project_not_found]
end
end
def check_project_moved!
return if redirected_path.nil?
project_moved = Checks::ProjectMoved.new(project, user, protocol, redirected_path)
if project_moved.permanent_redirect?
project_moved.add_message
else
raise ProjectMovedError, project_moved.message(rejected: true)
end
end
def check_command_disabled!(cmd)
if upload_pack?(cmd)
check_upload_pack_disabled!
elsif receive_pack?(cmd)
check_receive_pack_disabled!
end
end
def check_upload_pack_disabled!
if http? && upload_pack_disabled_over_http?
raise UnauthorizedError, ERROR_MESSAGES[:upload_pack_disabled_over_http]
end
end
def check_receive_pack_disabled!
if http? && receive_pack_disabled_over_http?
raise UnauthorizedError, ERROR_MESSAGES[:receive_pack_disabled_over_http]
end
end
def check_command_existence!(cmd)
unless ALL_COMMANDS.include?(cmd)
raise UnauthorizedError, ERROR_MESSAGES[:command_not_allowed]
end
end
def check_db_accessibility!(cmd)
return unless receive_pack?(cmd)
if Gitlab::Database.read_only?
raise UnauthorizedError, push_to_read_only_message
end
end
def ensure_project_on_push!(cmd, changes)
return if project || deploy_key?
return unless receive_pack?(cmd) && changes == '_any' && authentication_abilities.include?(:push_code)
namespace = Namespace.find_by_full_path(namespace_path)
return unless user&.can?(:create_projects, namespace)
project_params = {
path: project_path,
namespace_id: namespace.id,
visibility_level: Gitlab::VisibilityLevel::PRIVATE
}
project = Projects::CreateService.new(user, project_params).execute
unless project.saved?
raise ProjectCreationError, "Could not create project: #{project.errors.full_messages.join(', ')}"
end
@project = project
user_access.project = @project
Checks::ProjectCreated.new(project, user, protocol).add_message
end
def check_repository_existence!
unless project.repository.exists?
raise UnauthorizedError, ERROR_MESSAGES[:no_repo]
end
end
def check_download_access!
passed = deploy_key? ||
user_can_download_code? ||
build_can_download_code? ||
guest_can_download_code?
unless passed
raise UnauthorizedError, ERROR_MESSAGES[:download]
end
end
def check_push_access!(changes)
if project.repository_read_only?
raise UnauthorizedError, ERROR_MESSAGES[:read_only]
end
if deploy_key
unless deploy_key.can_push_to?(project)
raise UnauthorizedError, ERROR_MESSAGES[:deploy_key_upload]
end
elsif user
# User access is verified in check_change_access!
else
raise UnauthorizedError, ERROR_MESSAGES[:upload]
end
return if changes.blank? # Allow access this is needed for EE.
check_change_access!(changes)
end
def check_change_access!(changes)
changes_list = Gitlab::ChangesList.new(changes)
# Iterate over all changes to find if user allowed all of them to be applied
changes_list.each.with_index do |change, index|
first_change = index == 0
# If user does not have access to make at least one change, cancel all
# push by allowing the exception to bubble up
check_single_change_access(change, skip_lfs_integrity_check: !first_change)
end
end
def check_single_change_access(change, skip_lfs_integrity_check: false)
Checks::ChangeAccess.new(
change,
user_access: user_access,
project: project,
skip_authorization: deploy_key?,
skip_lfs_integrity_check: skip_lfs_integrity_check,
protocol: protocol
).exec
end
def deploy_key
actor if deploy_key?
end
def deploy_key?
actor.is_a?(DeployKey)
end
def ci?
actor == :ci
end
def can_read_project?
if deploy_key?
deploy_key.has_access_to?(project)
elsif user
user.can?(:read_project, project)
elsif ci?
true # allow CI (build without a user) for backwards compatibility
end || Guest.can?(:read_project, project)
end
def http?
protocol == 'http'
end
def upload_pack?(command)
command == 'git-upload-pack'
end
def receive_pack?(command)
command == 'git-receive-pack'
end
def upload_pack_disabled_over_http?
!Gitlab.config.gitlab_shell.upload_pack
end
def receive_pack_disabled_over_http?
!Gitlab.config.gitlab_shell.receive_pack
end
protected
def user
return @user if defined?(@user)
@user =
case actor
when User
actor
when Key
actor.user unless actor.is_a?(DeployKey)
when :ci
nil
end
end
def user_access
@user_access ||= if ci?
CiAccess.new
else
UserAccess.new(user, project: project)
end
end
def push_to_read_only_message
ERROR_MESSAGES[:cannot_push_to_read_only]
end
end
end