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moby--moby/daemon/execdriver/utils.go

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package execdriver
import (
"fmt"
"strings"
"github.com/docker/docker/pkg/stringutils"
"github.com/syndtr/gocapability/capability"
)
var capabilityList = Capabilities{
{Key: "SETPCAP", Value: capability.CAP_SETPCAP},
{Key: "SYS_MODULE", Value: capability.CAP_SYS_MODULE},
{Key: "SYS_RAWIO", Value: capability.CAP_SYS_RAWIO},
{Key: "SYS_PACCT", Value: capability.CAP_SYS_PACCT},
{Key: "SYS_ADMIN", Value: capability.CAP_SYS_ADMIN},
{Key: "SYS_NICE", Value: capability.CAP_SYS_NICE},
{Key: "SYS_RESOURCE", Value: capability.CAP_SYS_RESOURCE},
{Key: "SYS_TIME", Value: capability.CAP_SYS_TIME},
{Key: "SYS_TTY_CONFIG", Value: capability.CAP_SYS_TTY_CONFIG},
{Key: "MKNOD", Value: capability.CAP_MKNOD},
{Key: "AUDIT_WRITE", Value: capability.CAP_AUDIT_WRITE},
{Key: "AUDIT_CONTROL", Value: capability.CAP_AUDIT_CONTROL},
{Key: "MAC_OVERRIDE", Value: capability.CAP_MAC_OVERRIDE},
{Key: "MAC_ADMIN", Value: capability.CAP_MAC_ADMIN},
{Key: "NET_ADMIN", Value: capability.CAP_NET_ADMIN},
{Key: "SYSLOG", Value: capability.CAP_SYSLOG},
{Key: "CHOWN", Value: capability.CAP_CHOWN},
{Key: "NET_RAW", Value: capability.CAP_NET_RAW},
{Key: "DAC_OVERRIDE", Value: capability.CAP_DAC_OVERRIDE},
{Key: "FOWNER", Value: capability.CAP_FOWNER},
{Key: "DAC_READ_SEARCH", Value: capability.CAP_DAC_READ_SEARCH},
{Key: "FSETID", Value: capability.CAP_FSETID},
{Key: "KILL", Value: capability.CAP_KILL},
{Key: "SETGID", Value: capability.CAP_SETGID},
{Key: "SETUID", Value: capability.CAP_SETUID},
{Key: "LINUX_IMMUTABLE", Value: capability.CAP_LINUX_IMMUTABLE},
{Key: "NET_BIND_SERVICE", Value: capability.CAP_NET_BIND_SERVICE},
{Key: "NET_BROADCAST", Value: capability.CAP_NET_BROADCAST},
{Key: "IPC_LOCK", Value: capability.CAP_IPC_LOCK},
{Key: "IPC_OWNER", Value: capability.CAP_IPC_OWNER},
{Key: "SYS_CHROOT", Value: capability.CAP_SYS_CHROOT},
{Key: "SYS_PTRACE", Value: capability.CAP_SYS_PTRACE},
{Key: "SYS_BOOT", Value: capability.CAP_SYS_BOOT},
{Key: "LEASE", Value: capability.CAP_LEASE},
{Key: "SETFCAP", Value: capability.CAP_SETFCAP},
{Key: "WAKE_ALARM", Value: capability.CAP_WAKE_ALARM},
{Key: "BLOCK_SUSPEND", Value: capability.CAP_BLOCK_SUSPEND},
}
type (
CapabilityMapping struct {
Key string `json:"key,omitempty"`
Value capability.Cap `json:"value,omitempty"`
}
Capabilities []*CapabilityMapping
)
func (c *CapabilityMapping) String() string {
return c.Key
}
func GetCapability(key string) *CapabilityMapping {
for _, capp := range capabilityList {
if capp.Key == key {
cpy := *capp
return &cpy
}
}
return nil
}
func GetAllCapabilities() []string {
output := make([]string, len(capabilityList))
for i, capability := range capabilityList {
output[i] = capability.String()
}
return output
}
func TweakCapabilities(basics, adds, drops []string) ([]string, error) {
var (
newCaps []string
allCaps = GetAllCapabilities()
)
// look for invalid cap in the drop list
for _, cap := range drops {
if strings.ToLower(cap) == "all" {
continue
}
if !stringutils.InSlice(allCaps, cap) {
return nil, fmt.Errorf("Unknown capability drop: %q", cap)
}
}
// handle --cap-add=all
if stringutils.InSlice(adds, "all") {
basics = allCaps
}
if !stringutils.InSlice(drops, "all") {
for _, cap := range basics {
// skip `all` aready handled above
if strings.ToLower(cap) == "all" {
continue
}
// if we don't drop `all`, add back all the non-dropped caps
if !stringutils.InSlice(drops, cap) {
newCaps = append(newCaps, strings.ToUpper(cap))
}
}
}
for _, cap := range adds {
// skip `all` aready handled above
if strings.ToLower(cap) == "all" {
continue
}
if !stringutils.InSlice(allCaps, cap) {
return nil, fmt.Errorf("Unknown capability to add: %q", cap)
}
// add cap if not already in the list
if !stringutils.InSlice(newCaps, cap) {
newCaps = append(newCaps, strings.ToUpper(cap))
}
}
return newCaps, nil
}