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package app
import (
"encoding/gob"
"os"
"git.ophivana.moe/cat/fortify/dbus"
"git.ophivana.moe/cat/fortify/helper/bwrap"
"git.ophivana.moe/cat/fortify/internal/system"
)
func init() {
gob.Register(new(bwrap.PermConfig[*bwrap.TmpfsConfig]))
}
// Config is used to seal an *App
type Config struct {
// D-Bus application ID
ID string `json:"id"`
// username of the target user to switch to
User string `json:"user"`
// value passed through to the child process as its argv
Command []string `json:"command"`
// string representation of the child's launch method
Method string `json:"method"`
// child confinement configuration
Confinement ConfinementConfig `json:"confinement"`
}
// ConfinementConfig defines fortified child's confinement
type ConfinementConfig struct {
// bwrap sandbox confinement configuration
Sandbox *SandboxConfig `json:"sandbox"`
// reference to a system D-Bus proxy configuration,
// nil value disables system bus proxy
SystemBus *dbus.Config `json:"system_bus,omitempty"`
// reference to a session D-Bus proxy configuration,
// nil value makes session bus proxy assume built-in defaults
SessionBus *dbus.Config `json:"session_bus,omitempty"`
// child capability enablements
Enablements system.Enablements `json:"enablements"`
}
// SandboxConfig describes resources made available to the sandbox.
type SandboxConfig struct {
// unix hostname within sandbox
Hostname string `json:"hostname,omitempty"`
// userns availability within sandbox
UserNS bool `json:"userns,omitempty"`
// share net namespace
Net bool `json:"net,omitempty"`
// do not run in new session
NoNewSession bool `json:"no_new_session,omitempty"`
// mediated access to wayland socket
Wayland bool `json:"wayland,omitempty"`
// final environment variables
Env map[string]string `json:"env"`
// sandbox host filesystem access
Filesystem []*FilesystemConfig `json:"filesystem"`
// paths to override by mounting tmpfs over them
Override []string `json:"override"`
}
type FilesystemConfig struct {
// mount point in sandbox, same as src if empty
Dst string `json:"dst,omitempty"`
// host filesystem path to make available to sandbox
Src string `json:"src"`
// write access
Write bool `json:"write,omitempty"`
// device access
Device bool `json:"dev,omitempty"`
// exit if unable to share
Must bool `json:"require,omitempty"`
}
// Bwrap returns the address of the corresponding bwrap.Config to s.
// Note that remaining tmpfs entries must be queued by the caller prior to launch.
func (s *SandboxConfig) Bwrap() *bwrap.Config {
if s == nil {
return nil
}
conf := (&bwrap.Config{
Net: s.Net,
UserNS: s.UserNS,
Hostname: s.Hostname,
Clearenv: true,
SetEnv: s.Env,
NewSession: !s.NoNewSession,
DieWithParent: true,
AsInit: true,
// initialise map
Chmod: make(map[string]os.FileMode),
}).
SetUID(65534).SetGID(65534).
Procfs("/proc").DevTmpfs("/dev").Mqueue("/dev/mqueue")
for _, c := range s.Filesystem {
if c == nil {
continue
}
src := c.Src
dest := c.Dst
if c.Dst == "" {
dest = c.Src
}
conf.Bind(src, dest, !c.Must, c.Write, c.Device)
}
return conf
}
// Template returns a fully populated instance of Config.
func Template() *Config {
return &Config{
ID: "org.chromium.Chromium",
User: "chronos",
Command: []string{
"chromium",
"--ignore-gpu-blocklist",
"--disable-smooth-scrolling",
"--enable-features=UseOzonePlatform",
"--ozone-platform=wayland",
},
Method: "sudo",
Confinement: ConfinementConfig{
Sandbox: &SandboxConfig{
Hostname: "localhost",
UserNS: true,
Net: true,
NoNewSession: true,
Wayland: false,
// example API credentials pulled from Google Chrome
// DO NOT USE THESE IN A REAL BROWSER
Env: map[string]string{
"GOOGLE_API_KEY": "AIzaSyBHDrl33hwRp4rMQY0ziRbj8K9LPA6vUCY",
"GOOGLE_DEFAULT_CLIENT_ID": "77185425430.apps.googleusercontent.com",
"GOOGLE_DEFAULT_CLIENT_SECRET": "OTJgUOQcT7lO7GsGZq2G4IlT",
},
Filesystem: []*FilesystemConfig{
{Src: "/nix"},
{Src: "/storage/emulated/0", Write: true, Must: true},
{Src: "/data/user/0", Dst: "/data/data", Write: true, Must: true},
{Src: "/var/tmp", Write: true},
},
Override: []string{"/var/run/nscd"},
},
SystemBus: &dbus.Config{
See: nil,
Talk: []string{"org.bluez", "org.freedesktop.Avahi", "org.freedesktop.UPower"},
Own: nil,
Call: nil,
Broadcast: nil,
Log: false,
Filter: true,
},
SessionBus: &dbus.Config{
See: nil,
Talk: []string{"org.freedesktop.Notifications", "org.freedesktop.FileManager1", "org.freedesktop.ScreenSaver",
"org.freedesktop.secrets", "org.kde.kwalletd5", "org.kde.kwalletd6", "org.gnome.SessionManager"},
Own: []string{"org.chromium.Chromium.*", "org.mpris.MediaPlayer2.org.chromium.Chromium.*",
"org.mpris.MediaPlayer2.chromium.*"},
Call: map[string]string{"org.freedesktop.portal.*": "*"},
Broadcast: map[string]string{"org.freedesktop.portal.*": "@/org/freedesktop/portal/*"},
Log: false,
Filter: true,
},
Enablements: system.EWayland.Mask() | system.EDBus.Mask() | system.EPulse.Mask(),
},
}
}
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