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package container
import (
"syscall"
"unsafe"
"hakurei.app/ext"
)
const (
_LINUX_CAPABILITY_VERSION_3 = 0x20080522
PR_CAP_AMBIENT = 0x2f
PR_CAP_AMBIENT_RAISE = 0x2
PR_CAP_AMBIENT_CLEAR_ALL = 0x4
CAP_SYS_ADMIN = 0x15
CAP_SETPCAP = 0x8
CAP_NET_ADMIN = 0xc
CAP_DAC_OVERRIDE = 0x1
)
type (
capHeader struct {
version uint32
pid int32
}
capData struct {
effective uint32
permitted uint32
inheritable uint32
}
)
// See CAP_TO_INDEX in linux/capability.h:
func capToIndex(cap uintptr) uintptr { return cap >> 5 }
// See CAP_TO_MASK in linux/capability.h:
func capToMask(cap uintptr) uint32 { return 1 << uint(cap&31) }
func capset(hdrp *capHeader, datap *[2]capData) error {
r, _, errno := syscall.Syscall(
syscall.SYS_CAPSET,
uintptr(unsafe.Pointer(hdrp)),
uintptr(unsafe.Pointer(&datap[0])), 0,
)
if r != 0 {
return errno
}
return nil
}
// capBoundingSetDrop drops a capability from the calling thread's capability bounding set.
func capBoundingSetDrop(cap uintptr) error {
return ext.Prctl(syscall.PR_CAPBSET_DROP, cap, 0)
}
// capAmbientClearAll clears the ambient capability set of the calling thread.
func capAmbientClearAll() error {
return ext.Prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_CLEAR_ALL, 0)
}
// capAmbientRaise adds to the ambient capability set of the calling thread.
func capAmbientRaise(cap uintptr) error {
return ext.Prctl(PR_CAP_AMBIENT, PR_CAP_AMBIENT_RAISE, cap)
}
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