/usr/share/gocode/src/github.com/docker/libnetwork/drivers/solaris/overlay/encryption.go is in golang-github-docker-libnetwork-dev 0.8.0-dev.2+git20170202.599.45b4086-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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import (
"bytes"
"encoding/binary"
"encoding/hex"
"fmt"
"hash/fnv"
"net"
"sync"
"github.com/Sirupsen/logrus"
"github.com/docker/libnetwork/types"
)
const (
mark = uint32(0xD0C4E3)
timeout = 30
pktExpansion = 26 // SPI(4) + SeqN(4) + IV(8) + PadLength(1) + NextHeader(1) + ICV(8)
)
const (
forward = iota + 1
reverse
bidir
)
type key struct {
value []byte
tag uint32
}
func (k *key) String() string {
if k != nil {
return fmt.Sprintf("(key: %s, tag: 0x%x)", hex.EncodeToString(k.value)[0:5], k.tag)
}
return ""
}
type spi struct {
forward int
reverse int
}
func (s *spi) String() string {
return fmt.Sprintf("SPI(FWD: 0x%x, REV: 0x%x)", uint32(s.forward), uint32(s.reverse))
}
type encrMap struct {
nodes map[string][]*spi
sync.Mutex
}
func (e *encrMap) String() string {
e.Lock()
defer e.Unlock()
b := new(bytes.Buffer)
for k, v := range e.nodes {
b.WriteString("\n")
b.WriteString(k)
b.WriteString(":")
b.WriteString("[")
for _, s := range v {
b.WriteString(s.String())
b.WriteString(",")
}
b.WriteString("]")
}
return b.String()
}
func (d *driver) checkEncryption(nid string, rIP net.IP, vxlanID uint32, isLocal, add bool) error {
logrus.Debugf("checkEncryption(%s, %v, %d, %t)", nid[0:7], rIP, vxlanID, isLocal)
n := d.network(nid)
if n == nil || !n.secure {
return nil
}
if len(d.keys) == 0 {
return types.ForbiddenErrorf("encryption key is not present")
}
lIP := net.ParseIP(d.bindAddress)
aIP := net.ParseIP(d.advertiseAddress)
nodes := map[string]net.IP{}
switch {
case isLocal:
if err := d.peerDbNetworkWalk(nid, func(pKey *peerKey, pEntry *peerEntry) bool {
if !aIP.Equal(pEntry.vtep) {
nodes[pEntry.vtep.String()] = pEntry.vtep
}
return false
}); err != nil {
logrus.Warnf("Failed to retrieve list of participating nodes in overlay network %s: %v", nid[0:5], err)
}
default:
if len(d.network(nid).endpoints) > 0 {
nodes[rIP.String()] = rIP
}
}
logrus.Debugf("List of nodes: %s", nodes)
if add {
for _, rIP := range nodes {
if err := setupEncryption(lIP, aIP, rIP, vxlanID, d.secMap, d.keys); err != nil {
logrus.Warnf("Failed to program network encryption between %s and %s: %v", lIP, rIP, err)
}
}
} else {
if len(nodes) == 0 {
if err := removeEncryption(lIP, rIP, d.secMap); err != nil {
logrus.Warnf("Failed to remove network encryption between %s and %s: %v", lIP, rIP, err)
}
}
}
return nil
}
func setupEncryption(localIP, advIP, remoteIP net.IP, vni uint32, em *encrMap, keys []*key) error {
logrus.Debugf("Programming encryption for vxlan %d between %s and %s", vni, localIP, remoteIP)
rIPs := remoteIP.String()
indices := make([]*spi, 0, len(keys))
err := programMangle(vni, true)
if err != nil {
logrus.Warn(err)
}
em.Lock()
em.nodes[rIPs] = indices
em.Unlock()
return nil
}
func removeEncryption(localIP, remoteIP net.IP, em *encrMap) error {
return nil
}
func programMangle(vni uint32, add bool) (err error) {
return
}
func buildSPI(src, dst net.IP, st uint32) int {
b := make([]byte, 4)
binary.BigEndian.PutUint32(b, st)
h := fnv.New32a()
h.Write(src)
h.Write(b)
h.Write(dst)
return int(binary.BigEndian.Uint32(h.Sum(nil)))
}
func (d *driver) secMapWalk(f func(string, []*spi) ([]*spi, bool)) error {
d.secMap.Lock()
for node, indices := range d.secMap.nodes {
idxs, stop := f(node, indices)
if idxs != nil {
d.secMap.nodes[node] = idxs
}
if stop {
break
}
}
d.secMap.Unlock()
return nil
}
func (d *driver) setKeys(keys []*key) error {
if d.keys != nil {
return types.ForbiddenErrorf("initial keys are already present")
}
d.keys = keys
logrus.Debugf("Initial encryption keys: %v", d.keys)
return nil
}
// updateKeys allows to add a new key and/or change the primary key and/or prune an existing key
// The primary key is the key used in transmission and will go in first position in the list.
func (d *driver) updateKeys(newKey, primary, pruneKey *key) error {
logrus.Debugf("Updating Keys. New: %v, Primary: %v, Pruned: %v", newKey, primary, pruneKey)
logrus.Debugf("Current: %v", d.keys)
var (
newIdx = -1
priIdx = -1
delIdx = -1
lIP = net.ParseIP(d.bindAddress)
)
d.Lock()
// add new
if newKey != nil {
d.keys = append(d.keys, newKey)
newIdx += len(d.keys)
}
for i, k := range d.keys {
if primary != nil && k.tag == primary.tag {
priIdx = i
}
if pruneKey != nil && k.tag == pruneKey.tag {
delIdx = i
}
}
d.Unlock()
if (newKey != nil && newIdx == -1) ||
(primary != nil && priIdx == -1) ||
(pruneKey != nil && delIdx == -1) {
err := types.BadRequestErrorf("cannot find proper key indices while processing key update:"+
"(newIdx,priIdx,delIdx):(%d, %d, %d)", newIdx, priIdx, delIdx)
logrus.Warn(err)
return err
}
d.secMapWalk(func(rIPs string, spis []*spi) ([]*spi, bool) {
rIP := net.ParseIP(rIPs)
return updateNodeKey(lIP, rIP, spis, d.keys, newIdx, priIdx, delIdx), false
})
d.Lock()
// swap primary
if priIdx != -1 {
swp := d.keys[0]
d.keys[0] = d.keys[priIdx]
d.keys[priIdx] = swp
}
// prune
if delIdx != -1 {
if delIdx == 0 {
delIdx = priIdx
}
d.keys = append(d.keys[:delIdx], d.keys[delIdx+1:]...)
}
d.Unlock()
logrus.Debugf("Updated: %v", d.keys)
return nil
}
/********************************************************
* Steady state: rSA0, rSA1, rSA2, fSA1, fSP1
* Rotation --> -rSA0, +rSA3, +fSA2, +fSP2/-fSP1, -fSA1
* Steady state: rSA1, rSA2, rSA3, fSA2, fSP2
*********************************************************/
// Spis and keys are sorted in such away the one in position 0 is the primary
func updateNodeKey(lIP, rIP net.IP, idxs []*spi, curKeys []*key, newIdx, priIdx, delIdx int) []*spi {
logrus.Debugf("Updating keys for node: %s (%d,%d,%d)", rIP, newIdx, priIdx, delIdx)
return nil
}
func (n *network) maxMTU() int {
mtu := 1500
if n.mtu != 0 {
mtu = n.mtu
}
mtu -= vxlanEncap
if n.secure {
// In case of encryption account for the
// esp packet espansion and padding
mtu -= pktExpansion
mtu -= (mtu % 4)
}
return mtu
}
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