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uid.go
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uid.go
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// Copyright (c) 2015 Mute Communications Ltd.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package cryptengine
import (
"bytes"
"encoding/json"
"fmt"
"os"
"strings"
"github.com/mutecomm/mute/cipher"
"github.com/mutecomm/mute/log"
"github.com/mutecomm/mute/uid"
"github.com/mutecomm/mute/uid/identity"
)
// generate a new nym and store it in keydb.
func (ce *CryptEngine) generate(
pseudonym string,
keyserver bool,
outputfp *os.File,
) error {
// map pseudonym
id, domain, err := identity.MapPlus(pseudonym)
if err != nil {
return err
}
// create new UID
// TODO: allow different PFS preferences
var lastEntry string
if !keyserver {
// no lastEntry, because this will be the first entry in hashchain
lastEntry, err = ce.keyDB.GetLastHashChainEntry(domain)
if err != nil {
return err
}
}
uid, err := uid.Create(id, false, "", "", uid.Strict, lastEntry,
cipher.RandReader)
if err != nil {
return err
}
if !keyserver {
// store UID in keyDB
if err := ce.keyDB.AddPrivateUID(uid); err != nil {
return err
}
} else {
// a private key for the keyserver is not stored in the keyDB
var out bytes.Buffer
if err := json.Indent(&out, []byte(uid.JSON()), "", " "); err != nil {
return err
}
fmt.Fprintln(outputfp, out.String())
if keyserver {
fmt.Fprintf(outputfp, "{\"PRIVSIGKEY\": %q}\n", uid.PrivateSigKey())
}
}
log.Infof("nym '%s' generated successfully", id)
return nil
}
func (ce *CryptEngine) registerOrUpdate(
pseudonym, token, command, verb string,
) error {
// map pseudonym
id, domain, err := identity.MapPlus(pseudonym)
if err != nil {
return err
}
// TODO: check token?
// get UID from keyDB
msg, messageReply, err := ce.keyDB.GetPrivateUID(id, false)
if err != nil {
return err
}
if messageReply != nil {
return log.Errorf("cryptengine: UID has already been %s", verb)
}
// get JSON-RPC client and capabilities
client, caps, err := ce.cache.Get(domain, ce.keydPort, ce.keydHost,
ce.homedir, "KeyRepository."+command)
if err != nil {
return err
}
// register/update UID with key server
content := make(map[string]interface{})
content["UIDMessage"] = msg
content["Token"] = token
reply, err := client.JSONRPCRequest("KeyRepository."+command, content)
if err != nil {
return err
}
rep, ok := reply["UIDMessageReply"].(map[string]interface{})
if !ok {
return log.Errorf("cryptengine: %s reply has the wrong type", command)
}
// marshal the unstructured UIDMessageReply into a JSON byte array
jsn, err := json.Marshal(rep)
if err != nil {
return err
}
// unmarshal the JSON byte array back into a UIDMessageReply
msgReply, err := uid.NewJSONReply(string(jsn))
if err != nil {
return err
}
// store reply first to have proof, if the key server is cheating
if err := ce.keyDB.AddPrivateUIDReply(msg, msgReply); err != nil {
return err
}
// verify reply
// TODO: keyserver can return more than one SIGPUBKEY
if err := msgReply.VerifySrvSig(msg, caps.SIGPUBKEYS[0]); err != nil {
return err
}
log.Infof("nym '%s' %s successfully", id, verb)
return nil
}
// register already generated nym (stored in keyDB) with key server.
func (ce *CryptEngine) register(pseudonym, tokenString string) error {
return ce.registerOrUpdate(pseudonym, tokenString, "CreateUID", "registered")
}
// genupdate generates an update for the (registered) nym and stores it in keydb.
func (ce *CryptEngine) genupdate(pseudonym string) error {
// map pseudonym
id, err := identity.Map(pseudonym)
if err != nil {
return err
}
// get old UID from keyDB
oldUID, _, err := ce.keyDB.GetPrivateUID(id, true)
if err != nil {
return err
}
// generate new UID
newUID, err := oldUID.Update(cipher.RandReader)
if err != nil {
return err
}
// store new UID in keyDB
return ce.keyDB.AddPrivateUID(newUID)
}
// update an already generated nym update (stored in keyDB) with key server.
func (ce *CryptEngine) update(pseudonym, tokenString string) error {
return ce.registerOrUpdate(pseudonym, tokenString, "UpdateUID", "updated")
}
// deleteUID deletes a nym.
func (ce *CryptEngine) deleteUID(pseudonym string, force bool) error {
// map pseudonym
id, err := identity.Map(pseudonym)
if err != nil {
return err
}
// get UID from keyDB
msg, _, err := ce.keyDB.GetPrivateUID(id, false)
if err != nil {
return err
}
// ask for manual confirmation
if !force {
fmt.Fprintf(os.Stderr, "cryptengine: delete user ID %s and all it's key material? ",
pseudonym)
var response string
_, err := fmt.Scanln(&response)
if err != nil {
return log.Error(err)
}
if !strings.HasPrefix(strings.ToLower(response), "y") {
return log.Error("cryptengine: user ID deletion aborted")
}
}
// delete UID from keyDB
return ce.keyDB.DelPrivateUID(msg)
}
// list UIDs shows all own (mapped) users IDs on outfp.
func (ce *CryptEngine) listUIDs(outfp *os.File) error {
ids, err := ce.keyDB.GetPrivateIdentities()
if err != nil {
return err
}
for _, id := range ids {
fmt.Fprintln(outfp, id)
}
return nil
}