403 lines
11 KiB
Ruby
403 lines
11 KiB
Ruby
# frozen_string_literal: true
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# Check a user's access to perform a git action. All public methods in this
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# class return an instance of `GitlabAccessStatus`
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module Gitlab
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class GitAccess
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include Gitlab::Utils::StrongMemoize
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UnauthorizedError = Class.new(StandardError)
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NotFoundError = Class.new(StandardError)
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ProjectCreationError = Class.new(StandardError)
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TimeoutError = Class.new(StandardError)
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ProjectMovedError = Class.new(NotFoundError)
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# Use the magic string '_any' to indicate we do not know what the
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# changes are. This is also what gitlab-shell does.
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ANY = '_any'
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ERROR_MESSAGES = {
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upload: 'You are not allowed to upload code for this project.',
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download: 'You are not allowed to download code from this project.',
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auth_upload: 'You are not allowed to upload code.',
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auth_download: 'You are not allowed to download code.',
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deploy_key_upload: 'This deploy key does not have write access to this project.',
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no_repo: 'A repository for this project does not exist yet.',
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project_not_found: 'The project you were looking for could not be found.',
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command_not_allowed: "The command you're trying to execute is not allowed.",
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upload_pack_disabled_over_http: 'Pulling over HTTP is not allowed.',
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receive_pack_disabled_over_http: 'Pushing over HTTP is not allowed.',
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read_only: 'The repository is temporarily read-only. Please try again later.',
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cannot_push_to_read_only: "You can't push code to a read-only GitLab instance.",
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push_code: 'You are not allowed to push code to this project.'
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}.freeze
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INTERNAL_TIMEOUT = 50.seconds.freeze
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LOG_HEADER = <<~MESSAGE
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Push operation timed out
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Timing information for debugging purposes:
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MESSAGE
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DOWNLOAD_COMMANDS = %w{git-upload-pack git-upload-archive}.freeze
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PUSH_COMMANDS = %w{git-receive-pack}.freeze
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ALL_COMMANDS = DOWNLOAD_COMMANDS + PUSH_COMMANDS
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attr_reader :actor, :project, :protocol, :authentication_abilities, :namespace_path, :project_path, :redirected_path, :auth_result_type, :changes, :logger
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def initialize(actor, project, protocol, authentication_abilities:, namespace_path: nil, project_path: nil, redirected_path: nil, auth_result_type: nil)
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@actor = actor
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@project = project
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@protocol = protocol
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@authentication_abilities = authentication_abilities
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@namespace_path = namespace_path
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@project_path = project_path
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@redirected_path = redirected_path
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@auth_result_type = auth_result_type
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end
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def check(cmd, changes)
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@logger = Checks::TimedLogger.new(timeout: INTERNAL_TIMEOUT, header: LOG_HEADER)
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@changes = changes
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check_protocol!
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check_valid_actor!
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check_active_user!
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check_authentication_abilities!(cmd)
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check_command_disabled!(cmd)
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check_command_existence!(cmd)
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custom_action = check_custom_action(cmd)
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return custom_action if custom_action
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check_db_accessibility!(cmd)
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ensure_project_on_push!(cmd, changes)
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check_project_accessibility!
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add_project_moved_message!
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check_repository_existence!
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case cmd
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when *DOWNLOAD_COMMANDS
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check_download_access!
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when *PUSH_COMMANDS
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check_push_access!
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end
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::Gitlab::GitAccessResult::Success.new
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end
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def guest_can_download_code?
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Guest.can?(:download_code, project)
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end
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def user_can_download_code?
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authentication_abilities.include?(:download_code) && user_access.can_do_action?(:download_code)
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end
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def build_can_download_code?
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authentication_abilities.include?(:build_download_code) && user_access.can_do_action?(:build_download_code)
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end
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def request_from_ci_build?
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return false unless protocol == 'http'
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auth_result_type == :build || auth_result_type == :ci
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end
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def protocol_allowed?
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Gitlab::ProtocolAccess.allowed?(protocol)
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end
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private
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def check_custom_action(cmd)
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nil
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end
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def check_valid_actor!
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return unless actor.is_a?(Key)
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unless actor.valid?
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raise UnauthorizedError, "Your SSH key #{actor.errors[:key].first}."
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end
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end
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def check_protocol!
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return if request_from_ci_build?
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unless protocol_allowed?
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raise UnauthorizedError, "Git access over #{protocol.upcase} is not allowed"
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end
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end
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def check_active_user!
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return unless user
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unless user_access.allowed?
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message = Gitlab::Auth::UserAccessDeniedReason.new(user).rejection_message
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raise UnauthorizedError, message
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end
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end
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def check_authentication_abilities!(cmd)
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case cmd
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when *DOWNLOAD_COMMANDS
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unless authentication_abilities.include?(:download_code) || authentication_abilities.include?(:build_download_code)
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raise UnauthorizedError, ERROR_MESSAGES[:auth_download]
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end
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when *PUSH_COMMANDS
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unless authentication_abilities.include?(:push_code)
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raise UnauthorizedError, ERROR_MESSAGES[:auth_upload]
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end
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end
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end
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def check_project_accessibility!
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if project.blank? || !can_read_project?
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raise NotFoundError, ERROR_MESSAGES[:project_not_found]
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end
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end
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def add_project_moved_message!
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return if redirected_path.nil?
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project_moved = Checks::ProjectMoved.new(project, user, protocol, redirected_path)
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project_moved.add_message
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end
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def check_command_disabled!(cmd)
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if upload_pack?(cmd)
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check_upload_pack_disabled!
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elsif receive_pack?(cmd)
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check_receive_pack_disabled!
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end
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end
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def check_upload_pack_disabled!
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if http? && upload_pack_disabled_over_http?
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raise UnauthorizedError, ERROR_MESSAGES[:upload_pack_disabled_over_http]
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end
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end
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def check_receive_pack_disabled!
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if http? && receive_pack_disabled_over_http?
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raise UnauthorizedError, ERROR_MESSAGES[:receive_pack_disabled_over_http]
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end
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end
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def check_command_existence!(cmd)
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unless ALL_COMMANDS.include?(cmd)
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raise UnauthorizedError, ERROR_MESSAGES[:command_not_allowed]
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end
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end
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def check_db_accessibility!(cmd)
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return unless receive_pack?(cmd)
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if Gitlab::Database.read_only?
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raise UnauthorizedError, push_to_read_only_message
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end
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end
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def ensure_project_on_push!(cmd, changes)
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return if project || deploy_key?
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return unless receive_pack?(cmd) && changes == ANY && authentication_abilities.include?(:push_code)
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namespace = Namespace.find_by_full_path(namespace_path)
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return unless user&.can?(:create_projects, namespace)
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project_params = {
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path: project_path,
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namespace_id: namespace.id,
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visibility_level: Gitlab::VisibilityLevel::PRIVATE
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}
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project = Projects::CreateService.new(user, project_params).execute
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unless project.saved?
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raise ProjectCreationError, "Could not create project: #{project.errors.full_messages.join(', ')}"
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end
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@project = project
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user_access.project = @project
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Checks::ProjectCreated.new(project, user, protocol).add_message
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end
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def check_repository_existence!
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unless repository.exists?
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raise NotFoundError, ERROR_MESSAGES[:no_repo]
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end
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end
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def check_download_access!
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passed = deploy_key? ||
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deploy_token? ||
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user_can_download_code? ||
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build_can_download_code? ||
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guest_can_download_code?
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unless passed
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raise UnauthorizedError, ERROR_MESSAGES[:download]
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end
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end
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def check_push_access!
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if project.repository_read_only?
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raise UnauthorizedError, ERROR_MESSAGES[:read_only]
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end
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if deploy_key?
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unless deploy_key.can_push_to?(project)
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raise UnauthorizedError, ERROR_MESSAGES[:deploy_key_upload]
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end
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elsif user
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# User access is verified in check_change_access!
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else
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raise UnauthorizedError, ERROR_MESSAGES[:upload]
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end
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check_change_access!
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end
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def check_change_access!
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# Deploy keys with write access can push anything
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return if deploy_key?
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if changes == ANY
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can_push = user_access.can_do_action?(:push_code) ||
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project.any_branch_allows_collaboration?(user_access.user)
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unless can_push
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raise GitAccess::UnauthorizedError, ERROR_MESSAGES[:push_code]
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end
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else
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# If there are worktrees with a HEAD pointing to a non-existent object,
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# calls to `git rev-list --all` will fail in git 2.15+. This should also
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# clear stale lock files.
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project.repository.clean_stale_repository_files
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# Iterate over all changes to find if user allowed all of them to be applied
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changes_list.each.with_index do |change, index|
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first_change = index == 0
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# If user does not have access to make at least one change, cancel all
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# push by allowing the exception to bubble up
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check_single_change_access(change, skip_lfs_integrity_check: !first_change)
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end
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end
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end
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def check_single_change_access(change, skip_lfs_integrity_check: false)
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change_access = Checks::ChangeAccess.new(
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change,
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user_access: user_access,
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project: project,
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skip_lfs_integrity_check: skip_lfs_integrity_check,
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protocol: protocol,
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logger: logger
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)
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change_access.exec
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rescue Checks::TimedLogger::TimeoutError
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raise TimeoutError, logger.full_message
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end
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def deploy_key
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actor if deploy_key?
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end
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def deploy_key?
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actor.is_a?(DeployKey)
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end
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def deploy_token
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actor if deploy_token?
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end
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def deploy_token?
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actor.is_a?(DeployToken)
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end
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def ci?
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actor == :ci
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end
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def can_read_project?
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if deploy_key?
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deploy_key.has_access_to?(project)
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elsif deploy_token?
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deploy_token.has_access_to?(project)
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elsif user
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user.can?(:read_project, project)
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elsif ci?
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true # allow CI (build without a user) for backwards compatibility
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end || Guest.can?(:read_project, project)
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end
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def http?
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protocol == 'http'
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end
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def upload_pack?(command)
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command == 'git-upload-pack'
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end
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def receive_pack?(command)
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command == 'git-receive-pack'
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end
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def upload_pack_disabled_over_http?
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!Gitlab.config.gitlab_shell.upload_pack
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end
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def receive_pack_disabled_over_http?
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!Gitlab.config.gitlab_shell.receive_pack
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end
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protected
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def changes_list
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@changes_list ||= Gitlab::ChangesList.new(changes == ANY ? [] : changes)
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end
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def user
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return @user if defined?(@user)
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@user =
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case actor
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when User
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actor
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when DeployKey
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nil
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when Key
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actor.user
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when :ci
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nil
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end
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end
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def user_access
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@user_access ||= if ci?
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CiAccess.new
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elsif user && request_from_ci_build?
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BuildAccess.new(user, project: project)
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else
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UserAccess.new(user, project: project)
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end
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end
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def push_to_read_only_message
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ERROR_MESSAGES[:cannot_push_to_read_only]
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end
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def repository
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project.repository
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end
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end
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end
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