Module: OsCtld::SwitchUser
- Extended by:
- OsCtl::Lib::Utils::System
- Includes:
- OsCtl::Lib::Utils::Log
- Defined in:
- lib/osctld/switch_user.rb
Defined Under Namespace
Classes: ContainerControl
Class Method Summary collapse
-
.apply_prlimits(pid, prlimits) ⇒ Object
Apply process resource limits.
-
.fork_and_switch_to(sysuser, ugid, homedir, cgroup_path, opts = {}, &block) ⇒ Object
Fork a process running as unprivileged user.
-
.switch_to(sysuser, ugid, homedir, cgroup_path, opts = {}) ⇒ Object
Switch the current process to an unprivileged user.
-
.switch_to_system(sysuser, uid, gid, homedir) ⇒ Object
Switch the current process to an unprivileged users, but do not change cgroups.
Class Method Details
.apply_prlimits(pid, prlimits) ⇒ Object
Apply process resource limits
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# File 'lib/osctld/switch_user.rb', line 88 def self.apply_prlimits(pid, prlimits) prlimits.each do |name, limit| PrLimits.set( pid, PrLimits.resource_to_const(name), limit[:soft], limit[:hard] ) end end |
.fork_and_switch_to(sysuser, ugid, homedir, cgroup_path, opts = {}, &block) ⇒ Object
Fork a process running as unprivileged user
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# File 'lib/osctld/switch_user.rb', line 16 def self.fork_and_switch_to(sysuser, ugid, homedir, cgroup_path, opts = {}, &block) r, w = IO.pipe pid = Process.fork do w.close switch_to(sysuser, ugid, homedir, cgroup_path, opts) msg = r.readline.strip r.close if msg == 'ready' block.call else exit(false) end end r.close apply_prlimits(pid, opts[:prlimits]) if opts[:prlimits] w.puts('ready') w.close pid end |
.switch_to(sysuser, ugid, homedir, cgroup_path, opts = {}) ⇒ Object
Switch the current process to an unprivileged user
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# File 'lib/osctld/switch_user.rb', line 43 def self.switch_to(sysuser, ugid, homedir, cgroup_path, opts = {}) chown_cgroups = opts.has_key?(:chown_cgroups) ? opts[:chown_cgroups] : true # Environment ENV.delete('XDG_SESSION_ID') ENV.delete('XDG_RUNTIME_DIR') ENV['HOME'] = homedir ENV['USER'] = sysuser # CGroups CGroup.subsystems.each do |subsys| CGroup.mkpath( subsys, cgroup_path.split('/'), attach: true, chown: chown_cgroups ? ugid : false ) end # Switch Process.groups = [ugid] Process::Sys.setgid(ugid) Process::Sys.setuid(ugid) end |
.switch_to_system(sysuser, uid, gid, homedir) ⇒ Object
Switch the current process to an unprivileged users, but do not change cgroups.
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# File 'lib/osctld/switch_user.rb', line 71 def self.switch_to_system(sysuser, uid, gid, homedir) # Environment ENV.delete('XDG_SESSION_ID') ENV.delete('XDG_RUNTIME_DIR') ENV['HOME'] = homedir ENV['USER'] = sysuser # Switch Process.groups = [gid] Process::Sys.setgid(gid) Process::Sys.setuid(uid) end |