300 lines
8.1 KiB
Ruby
300 lines
8.1 KiB
Ruby
# 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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UnauthorizedError = Class.new(StandardError)
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NotFoundError = Class.new(StandardError)
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ProjectCreationError = Class.new(StandardError)
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ProjectMovedError = Class.new(NotFoundError)
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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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deploy_key_upload:
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'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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account_blocked: 'Your account has been blocked.',
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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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}.freeze
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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, :redirected_path, :target_namespace
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def initialize(actor, project, protocol, authentication_abilities:, redirected_path: nil, target_namespace: nil)
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@actor = actor
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@project = project
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@protocol = protocol
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@redirected_path = redirected_path
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@authentication_abilities = authentication_abilities
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@target_namespace = target_namespace
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end
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def check(cmd, 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_project_accessibility!(cmd)
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check_project_moved!
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check_command_disabled!(cmd)
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check_command_existence!(cmd)
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check_repository_existence!(cmd)
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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!(cmd, changes)
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end
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true
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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 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_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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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 if deploy_key?
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if user && !user_access.allowed?
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raise UnauthorizedError, ERROR_MESSAGES[:account_blocked]
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end
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end
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def check_project_accessibility!(cmd)
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unless can_create_project_in_namespace?(cmd) || 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 check_project_moved!
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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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if project_moved.permanent_redirect?
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project_moved.add_message
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else
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raise ProjectMovedError, project_moved.message(rejected: true)
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end
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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_repository_existence!(cmd)
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unless can_create_project_in_namespace?(cmd) || project.repository.exists?
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raise UnauthorizedError, 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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return if deploy_key?
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passed = 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!(cmd, changes)
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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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return if can_create_project_in_namespace?(cmd)
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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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check_deploy_key_push_access!
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elsif user
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check_user_push_access!
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else
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raise UnauthorizedError, ERROR_MESSAGES[:upload]
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end
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return if changes.blank? # Allow access.
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check_change_access!(changes)
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end
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def check_user_push_access!
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unless authentication_abilities.include?(:push_code)
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raise UnauthorizedError, ERROR_MESSAGES[:upload]
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end
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end
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def check_deploy_key_push_access!
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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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end
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def check_change_access!(changes)
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changes_list = Gitlab::ChangesList.new(changes)
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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 do |change|
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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)
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end
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end
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def check_single_change_access(change)
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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_authorization: deploy_key?,
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protocol: protocol
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).exec
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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 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 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 can_create_project_in_namespace?(cmd)
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return false unless push?(cmd) && target_namespace && project.blank?
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user.can?(:create_projects, target_namespace)
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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 push?(cmd)
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PUSH_COMMANDS.include?(cmd)
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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 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 Key
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actor.user unless actor.is_a?(DeployKey)
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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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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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end
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end
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