diff options
Diffstat (limited to 'pkg/capabilities/capabilities.go')
-rw-r--r-- | pkg/capabilities/capabilities.go | 129 |
1 files changed, 0 insertions, 129 deletions
diff --git a/pkg/capabilities/capabilities.go b/pkg/capabilities/capabilities.go deleted file mode 100644 index ea22498b8..000000000 --- a/pkg/capabilities/capabilities.go +++ /dev/null @@ -1,129 +0,0 @@ -package capabilities - -// Copyright 2013-2018 Docker, Inc. - -// NOTE: this package has been copied from github.com/docker/docker but been -// changed significantly to fit the needs of libpod. - -import ( - "strings" - - "github.com/containers/libpod/pkg/util" - "github.com/pkg/errors" - "github.com/syndtr/gocapability/capability" -) - -var ( - // Used internally and populated during init(). - capabilityList []string - - // ErrUnknownCapability is thrown when an unknown capability is processed. - ErrUnknownCapability = errors.New("unknown capability") -) - -// All is a special value used to add/drop all known capababilities. -// Useful on the CLI for `--cap-add=all` etc. -const All = "ALL" - -func init() { - last := capability.CAP_LAST_CAP - // hack 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 - } - capabilityList = append(capabilityList, "CAP_"+strings.ToUpper(cap.String())) - } -} - -// AllCapabilities returns all known capabilities. -func AllCapabilities() []string { - return capabilityList -} - -// normalizeCapabilities normalizes caps by adding a "CAP_" prefix (if not yet -// present). -func normalizeCapabilities(caps []string) ([]string, error) { - normalized := make([]string, len(caps)) - for i, c := range caps { - c = strings.ToUpper(c) - if c == All { - normalized = append(normalized, c) - continue - } - if !strings.HasPrefix(c, "CAP_") { - c = "CAP_" + c - } - if !util.StringInSlice(c, capabilityList) { - return nil, errors.Wrapf(ErrUnknownCapability, "%q", c) - } - normalized[i] = c - } - return normalized, nil -} - -// ValidateCapabilities validates if caps only contains valid capabilities. -func ValidateCapabilities(caps []string) error { - for _, c := range caps { - if !util.StringInSlice(c, capabilityList) { - return errors.Wrapf(ErrUnknownCapability, "%q", c) - } - } - return nil -} - -// MergeCapabilities computes a set of capabilities by adding capapbitilities -// to or dropping them from base. -// -// Note that "ALL" will cause all known capabilities to be added/dropped but -// the ones specified to be dropped/added. -func MergeCapabilities(base, adds, drops []string) ([]string, error) { - if len(adds) == 0 && len(drops) == 0 { - // Nothing to tweak; we're done - return base, nil - } - - capDrop, err := normalizeCapabilities(drops) - if err != nil { - return nil, err - } - capAdd, err := normalizeCapabilities(adds) - if err != nil { - return nil, err - } - - // Make sure that capDrop and capAdd are distinct sets. - for _, drop := range capDrop { - if util.StringInSlice(drop, capAdd) { - return nil, errors.Errorf("capability %q cannot be dropped and added", drop) - } - } - - var caps []string - - switch { - case util.StringInSlice(All, capAdd): - // Add all capabilities except ones on capDrop - for _, c := range capabilityList { - if !util.StringInSlice(c, capDrop) { - caps = append(caps, c) - } - } - case util.StringInSlice(All, capDrop): - // "Drop" all capabilities; use what's in capAdd instead - caps = capAdd - default: - // First drop some capabilities - for _, c := range base { - if !util.StringInSlice(c, capDrop) { - caps = append(caps, c) - } - } - // Then add the list of capabilities from capAdd - caps = append(caps, capAdd...) - } - return caps, nil -} |