68 lines
1.5 KiB
Go
68 lines
1.5 KiB
Go
// +build linux
|
|
|
|
package libcontainer
|
|
|
|
import (
|
|
"fmt"
|
|
"os"
|
|
"strings"
|
|
|
|
"github.com/syndtr/gocapability/capability"
|
|
)
|
|
|
|
var capabilityMap map[string]capability.Cap
|
|
|
|
func init() {
|
|
capabilityMap = make(map[string]capability.Cap)
|
|
last := capability.CAP_LAST_CAP
|
|
// workaround for RHEL6 which has no /proc/sys/kernel/cap_last_cap
|
|
if last == capability.Cap(63) {
|
|
last = capability.CAP_BLOCK_SUSPEND
|
|
}
|
|
for _, cap := range capability.List() {
|
|
if cap > last {
|
|
continue
|
|
}
|
|
capKey := fmt.Sprintf("CAP_%s", strings.ToUpper(cap.String()))
|
|
capabilityMap[capKey] = cap
|
|
}
|
|
}
|
|
|
|
func newCapWhitelist(caps []string) (*whitelist, error) {
|
|
l := []capability.Cap{}
|
|
for _, c := range caps {
|
|
v, ok := capabilityMap[c]
|
|
if !ok {
|
|
return nil, fmt.Errorf("unknown capability %q", c)
|
|
}
|
|
l = append(l, v)
|
|
}
|
|
pid, err := capability.NewPid(os.Getpid())
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return &whitelist{
|
|
keep: l,
|
|
pid: pid,
|
|
}, nil
|
|
}
|
|
|
|
type whitelist struct {
|
|
pid capability.Capabilities
|
|
keep []capability.Cap
|
|
}
|
|
|
|
// dropBoundingSet drops the capability bounding set to those specified in the whitelist.
|
|
func (w *whitelist) dropBoundingSet() error {
|
|
w.pid.Clear(capability.BOUNDS)
|
|
w.pid.Set(capability.BOUNDS, w.keep...)
|
|
return w.pid.Apply(capability.BOUNDS)
|
|
}
|
|
|
|
// drop drops all capabilities for the current process except those specified in the whitelist.
|
|
func (w *whitelist) drop() error {
|
|
w.pid.Clear(allCapabilityTypes)
|
|
w.pid.Set(allCapabilityTypes, w.keep...)
|
|
return w.pid.Apply(allCapabilityTypes)
|
|
}
|