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|
package bwrap
import (
"fmt"
"strconv"
"git.gensokyo.uk/security/fortify/helper/proc"
"git.gensokyo.uk/security/fortify/sandbox/seccomp"
)
type SyscallPolicy struct {
// disable fortify extensions
Compat bool `json:"compat"`
// deny development syscalls
DenyDevel bool `json:"deny_devel"`
// deny multiarch/emulation syscalls
Multiarch bool `json:"multiarch"`
// allow PER_LINUX32
Linux32 bool `json:"linux32"`
// allow AF_CAN
Can bool `json:"can"`
// allow AF_BLUETOOTH
Bluetooth bool `json:"bluetooth"`
}
func (c *Config) seccompArgs() FDBuilder {
// explicitly disable syscall filter
if c.Syscall == nil {
// nil File skips builder
return new(seccompBuilder)
}
var (
opts seccomp.SyscallOpts
optd []string
optCond = [...]struct {
v bool
o seccomp.SyscallOpts
d string
}{
{!c.Syscall.Compat, seccomp.FlagExt, "fortify"},
{!c.UserNS, seccomp.FlagDenyNS, "denyns"},
{c.NewSession, seccomp.FlagDenyTTY, "denytty"},
{c.Syscall.DenyDevel, seccomp.FlagDenyDevel, "denydevel"},
{c.Syscall.Multiarch, seccomp.FlagMultiarch, "multiarch"},
{c.Syscall.Linux32, seccomp.FlagLinux32, "linux32"},
{c.Syscall.Can, seccomp.FlagCan, "can"},
{c.Syscall.Bluetooth, seccomp.FlagBluetooth, "bluetooth"},
}
)
scmpPrintln := seccomp.GetOutput()
if scmpPrintln != nil {
optd = make([]string, 1, len(optCond)+1)
optd[0] = "common"
}
for _, opt := range optCond {
if opt.v {
opts |= opt.o
if scmpPrintln != nil {
optd = append(optd, opt.d)
}
}
}
if scmpPrintln != nil {
scmpPrintln(fmt.Sprintf("seccomp flags: %s", optd))
}
return &seccompBuilder{seccomp.NewFile(opts)}
}
type seccompBuilder struct{ proc.File }
func (s *seccompBuilder) Len() int {
if s == nil || s.File == nil {
return 0
}
return 2
}
func (s *seccompBuilder) Append(args *[]string) {
if s == nil || s.File == nil {
return
}
*args = append(*args, Seccomp.String(), strconv.Itoa(int(s.Fd())))
}
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