114 lines
3 KiB
Go
114 lines
3 KiB
Go
// +build linux
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package libcontainer
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import (
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"fmt"
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"os"
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"strings"
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"github.com/opencontainers/runc/libcontainer/configs"
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"github.com/syndtr/gocapability/capability"
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)
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const allCapabilityTypes = capability.CAPS | capability.BOUNDS | capability.AMBS
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var capabilityMap map[string]capability.Cap
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func init() {
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capabilityMap = make(map[string]capability.Cap)
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last := capability.CAP_LAST_CAP
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// workaround for RHEL6 which has no /proc/sys/kernel/cap_last_cap
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if last == capability.Cap(63) {
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last = capability.CAP_BLOCK_SUSPEND
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}
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for _, cap := range capability.List() {
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if cap > last {
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continue
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}
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capKey := fmt.Sprintf("CAP_%s", strings.ToUpper(cap.String()))
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capabilityMap[capKey] = cap
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}
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}
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func newContainerCapList(capConfig *configs.Capabilities) (*containerCapabilities, error) {
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bounding := []capability.Cap{}
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for _, c := range capConfig.Bounding {
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v, ok := capabilityMap[c]
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if !ok {
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return nil, fmt.Errorf("unknown capability %q", c)
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}
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bounding = append(bounding, v)
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}
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effective := []capability.Cap{}
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for _, c := range capConfig.Effective {
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v, ok := capabilityMap[c]
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if !ok {
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return nil, fmt.Errorf("unknown capability %q", c)
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}
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effective = append(effective, v)
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}
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inheritable := []capability.Cap{}
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for _, c := range capConfig.Inheritable {
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v, ok := capabilityMap[c]
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if !ok {
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return nil, fmt.Errorf("unknown capability %q", c)
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}
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inheritable = append(inheritable, v)
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}
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permitted := []capability.Cap{}
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for _, c := range capConfig.Permitted {
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v, ok := capabilityMap[c]
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if !ok {
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return nil, fmt.Errorf("unknown capability %q", c)
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}
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permitted = append(permitted, v)
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}
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ambient := []capability.Cap{}
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for _, c := range capConfig.Ambient {
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v, ok := capabilityMap[c]
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if !ok {
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return nil, fmt.Errorf("unknown capability %q", c)
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}
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ambient = append(ambient, v)
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}
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pid, err := capability.NewPid(os.Getpid())
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if err != nil {
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return nil, err
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}
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return &containerCapabilities{
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bounding: bounding,
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effective: effective,
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inheritable: inheritable,
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permitted: permitted,
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ambient: ambient,
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pid: pid,
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}, nil
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}
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type containerCapabilities struct {
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pid capability.Capabilities
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bounding []capability.Cap
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effective []capability.Cap
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inheritable []capability.Cap
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permitted []capability.Cap
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ambient []capability.Cap
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}
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// ApplyBoundingSet sets the capability bounding set to those specified in the whitelist.
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func (c *containerCapabilities) ApplyBoundingSet() error {
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c.pid.Clear(capability.BOUNDS)
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c.pid.Set(capability.BOUNDS, c.bounding...)
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return c.pid.Apply(capability.BOUNDS)
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}
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// Apply sets all the capabilities for the current process in the config.
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func (c *containerCapabilities) ApplyCaps() error {
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c.pid.Clear(allCapabilityTypes)
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c.pid.Set(capability.BOUNDS, c.bounding...)
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c.pid.Set(capability.PERMITTED, c.permitted...)
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c.pid.Set(capability.INHERITABLE, c.inheritable...)
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c.pid.Set(capability.EFFECTIVE, c.effective...)
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c.pid.Set(capability.AMBIENT, c.ambient...)
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return c.pid.Apply(allCapabilityTypes)
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}
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