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package fst
import (
"git.gensokyo.uk/security/fortify/dbus"
"git.gensokyo.uk/security/fortify/helper/bwrap"
"git.gensokyo.uk/security/fortify/internal/system"
)
const Tmp = "/.fortify"
// Config is used to seal an app
type Config struct {
// application ID
ID string `json:"id"`
// value passed through to the child process as its argv
Command []string `json:"command"`
Confinement ConfinementConfig `json:"confinement"`
}
// ConfinementConfig defines fortified child's confinement
type ConfinementConfig struct {
// numerical application id, determines uid in the init namespace
AppID int `json:"app_id"`
// list of supplementary groups to inherit
Groups []string `json:"groups"`
// passwd username in the sandbox, defaults to passwd name of target uid or chronos
Username string `json:"username,omitempty"`
// home directory in sandbox, empty for outer
Inner string `json:"home_inner"`
// home directory in init namespace
Outer string `json:"home"`
// bwrap sandbox confinement configuration
Sandbox *SandboxConfig `json:"sandbox"`
// extra acl entries to append
ExtraPerms []*ExtraPermConfig `json:"extra_perms,omitempty"`
// 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"`
// system resources to expose to the sandbox
Enablements system.Enablements `json:"enablements"`
}
type ExtraPermConfig struct {
Ensure bool `json:"ensure,omitempty"`
Path string `json:"path"`
Read bool `json:"r,omitempty"`
Write bool `json:"w,omitempty"`
Execute bool `json:"x,omitempty"`
}
func (e *ExtraPermConfig) String() string {
buf := make([]byte, 0, 5+len(e.Path))
buf = append(buf, '-', '-', '-')
if e.Ensure {
buf = append(buf, '+')
}
buf = append(buf, ':')
buf = append(buf, []byte(e.Path)...)
if e.Read {
buf[0] = 'r'
}
if e.Write {
buf[1] = 'w'
}
if e.Execute {
buf[2] = 'x'
}
return string(buf)
}
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"`
// fail if mount fails
Must bool `json:"require,omitempty"`
}
// Template returns a fully populated instance of Config.
func Template() *Config {
return &Config{
ID: "org.chromium.Chromium",
Command: []string{
"chromium",
"--ignore-gpu-blocklist",
"--disable-smooth-scrolling",
"--enable-features=UseOzonePlatform",
"--ozone-platform=wayland",
},
Confinement: ConfinementConfig{
AppID: 9,
Groups: []string{"video"},
Username: "chronos",
Outer: "/var/lib/persist/home/org.chromium.Chromium",
Inner: "/var/lib/fortify",
Sandbox: &SandboxConfig{
Hostname: "localhost",
UserNS: true,
Net: true,
Dev: true,
Syscall: &bwrap.SyscallPolicy{DenyDevel: true, Multiarch: true},
NoNewSession: true,
MapRealUID: true,
DirectWayland: 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/store"},
{Src: "/run/current-system"},
{Src: "/run/opengl-driver"},
{Src: "/var/db/nix-channels"},
{Src: "/var/lib/fortify/u0/org.chromium.Chromium",
Dst: "/data/data/org.chromium.Chromium", Write: true, Must: true},
{Src: "/dev/dri", Device: true},
},
Link: [][2]string{{"/run/user/65534", "/run/user/150"}},
Etc: "/etc",
AutoEtc: true,
Override: []string{"/var/run/nscd"},
},
ExtraPerms: []*ExtraPermConfig{
{Path: "/var/lib/fortify/u0", Ensure: true, Execute: true},
{Path: "/var/lib/fortify/u0/org.chromium.Chromium", Read: true, Write: true, Execute: true},
},
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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