// FetchPost fetches a post from a peer and adds it.
func (ms MessageServer) FetchPost(url, auth string, msgID [message.MessageIDSize]byte, expireRequest uint64) error {
// Fetch the post
proto := repproto.New(ms.SocksProxy, "")
data, err := proto.GetSpecificAuth(url, auth, msgID[:])
// data, err := proto.GetSpecific(url, msgID[:])
if err != nil {
return err
}
// Verify and use it
signheader, err := message.Base64Message(data).GetSignHeader()
if err != nil {
log.Debugf("Bad fetch:GetSignHeader: %s\n", err)
return err
}
details, err := message.VerifySignature(*signheader, ms.MinHashCashBits)
if err != nil {
log.Debugf("Bad fetch:VerifySignature: %s\n", err)
return err
}
constantRecipientPub, MessageID, err := deferVerify(data)
if err != nil {
log.Debugf("Bad fetch:deferVerify: %s\n", err)
return err
}
if *MessageID != details.MsgID {
log.Debugs("Bad fetch:MessageID\n")
return ErrBadMessageID
}
msgStruct := &structs.MessageStruct{
MessageID: *MessageID,
ReceiverConstantPubKey: *constantRecipientPub,
SignerPub: details.PublicKey,
OneTime: false,
Sync: false,
Hidden: false,
ExpireRequest: expireRequest,
}
if message.KeyIsSync(constantRecipientPub) {
msgStruct.Sync = true
}
if message.KeyIsHidden(constantRecipientPub) {
msgStruct.Hidden = true
}
sigStruct := &structs.SignerStruct{
PublicKey: details.PublicKey,
Nonce: details.HashCashNonce,
Bits: details.HashCashBits,
}
sigStruct.MaxMessagesPosted, sigStruct.MaxMessagesRetained, sigStruct.ExpireTarget = ms.calcLimits(details.HashCashBits)
return ms.DB.Put(msgStruct, sigStruct, data)
}
// ProcessPost verifies and adds a post to the database.
func (ms MessageServer) ProcessPost(postdata io.ReadCloser, oneTime bool, expireRequest uint64) string {
data, err := utils.MaxRead(ms.MaxPostSize, postdata)
if err != nil {
return "ERROR: Message too big\n"
}
if len(data) < ms.MinPostSize {
return "ERROR: Message too small\n"
}
signheader, err := message.Base64Message(data).GetSignHeader()
if err != nil {
log.Debugf("Post:GetSignHeader: %s\n", err)
return "ERROR: Sign Header\n"
}
details, err := message.VerifySignature(*signheader, ms.MinHashCashBits)
if err != nil {
log.Debugf("Post:VerifySignature: %s\n", err)
return "ERROR: HashCash\n"
}
constantRecipientPub, MessageID, err := deferVerify(data)
if err != nil {
log.Debugf("Post:deferVerify: %s\n", err)
return "ERROR: Verify\n"
}
if *MessageID != details.MsgID {
log.Debugs("Post:MessageID\n")
return "ERROR: MessageID\n"
}
msgStruct := &structs.MessageStruct{
MessageID: *MessageID,
ReceiverConstantPubKey: *constantRecipientPub,
SignerPub: details.PublicKey,
OneTime: oneTime,
Sync: false,
Hidden: false,
ExpireRequest: expireRequest,
}
if !oneTime {
if message.KeyIsSync(constantRecipientPub) {
msgStruct.Sync = true
}
} else {
msgStruct.Sync = false
}
if message.KeyIsHidden(constantRecipientPub) {
msgStruct.Hidden = true
}
sigStruct := &structs.SignerStruct{
PublicKey: details.PublicKey,
Nonce: details.HashCashNonce,
Bits: details.HashCashBits,
}
sigStruct.MaxMessagesPosted, sigStruct.MaxMessagesRetained, sigStruct.ExpireTarget = ms.calcLimits(details.HashCashBits)
_, _ = msgStruct, sigStruct
ms.RandomSleep()
// err = ms.DB.Put(msgStruct, sigStruct, data)
err = ms.DB.PutNotify(msgStruct, sigStruct, data, ms.notifyChan)
ms.RandomSleep()
if err != nil {
log.Debugf("Post:MessageDB: %s\n", err)
return fmt.Sprintf("ERROR: %s\n", err)
}
log.Debugf("Post:Added: %x\n", MessageID[:12])
if ms.Stat {
stat.Input <- stat.Post
}
return "SUCCESS: Connection close\n"
}
// CmdDecrypt implements decryption functions
func CmdDecrypt() int {
var inData, decMessage []byte
var err error
var meta *message.MetaDataRecieve
var privkeystr string
var nullKey message.Curve25519Key
if OptionsVar.Server == "" {
getPeers(false)
}
if OptionsVar.Stmdir != "" && !isDir(OptionsVar.Stmdir) {
log.Fatalf("stmdir does not exist or is no directory: %s\n", OptionsVar.Stmdir)
return 1
}
// Read input data
maxInData := int64(GlobalConfigVar.BodyLength+message.KeyHeaderSize+message.SignHeaderSize) * 4
// Read data from stdin or file
if len(flag.Args()) == 0 {
inData, err = inputData(OptionsVar.Infile, maxInData)
if err != nil {
log.Fatalf("No input data: %s\n", err)
return 1
}
} else {
// read data from server (Get). CMDLine is [server/]messageid[_privatekey]
var messageidcl []byte
var server string
server, messageidcl, privkeystr = cmdlineURLparse(flag.Args()...)
if server == "" {
server = OptionsVar.Server
}
proto := repproto.New(OptionsVar.Socksserver, OptionsVar.Server, GlobalConfigVar.PasteServers...)
if server == "" {
server, inData, err = proto.Get(messageidcl)
} else {
inData, err = proto.GetSpecific(server, messageidcl)
}
if err != nil {
log.Fatalf("Fetch error: %s\n", err)
return 1
}
log.Dataf("STATUS (FetchServer):\t%s\n", server)
}
if len(inData) < (message.KeyHeaderSize+message.SignHeaderSize)*4 {
log.Fatals("No input data.\n")
return 1
}
// Set up receiver parameters
receiver := message.Receiver{
HashCashBits: GlobalConfigVar.MinHashCash,
}
if OptionsVar.Senderkey != "" {
receiver.SenderPublicKey, _ = utils.ParseKeyPair(OptionsVar.Senderkey)
}
// Select private key to use
if OptionsVar.Keymgt < 0 {
if privkeystr == "" { // might have been set from commandline
privkeystr = selectPrivKey(OptionsVar.Privkey, GlobalConfigVar.PrivateKey, "tty")
}
// Parse privkey
if privkeystr != "" {
receiver.ReceiveConstantPrivateKey, receiver.ReceiveTemporaryPrivateKey = utils.ParseKeyPair(privkeystr)
}
} else {
// Register callback, OptionsVar.keymgt == fd
keyMgtFile, callback := KeyCallBack(OptionsVar.Keymgt)
defer keyMgtFile.Close()
receiver.KeyCallBack = callback
}
log.Datas("STATUS (Process):\tREAD\n")
// Decrypt
decMessage, meta, err = receiver.Decrypt(inData)
if err != nil {
log.Fatalf("%s\n", err)
return 1
}
log.Dataf("STATUS (MessageID):\t%s\n", utils.B58encode(meta.MessageID[:]))
log.Dataf("STATUS (RecPubKey):\t%s\n", utils.B58encode(meta.ReceiveConstantPublicKey[:]))
log.Dataf("STATUS (SenderPubKey):\t%s\n", utils.B58encode(meta.SenderConstantPublicKey[:]))
// Get replyKeys
embedConstant, embedTemporary := utils.DecodeEmbedded(decMessage[:message.Curve25519KeySize*2])
if *embedConstant != nullKey {
log.Dataf("STATUS (EmbedPublicKey):\t%s_%s\n", utils.B58encode(embedConstant[:]), utils.B58encode(embedTemporary[:]))
}
// If messageType list: print list to DATA
if meta.MessageType == message.MsgTypeList {
log.Datas("STATUS (Process):\tLIST\n")
err := utils.VerifyListContent(decMessage[message.Curve25519KeySize*2:])
if err != nil {
log.Fatalf("%s\n", err)
return 1
}
lines := bytes.Split(decMessage[message.Curve25519KeySize*2:], []byte("\n"))
for _, l := range lines {
log.Dataf("STATUS (ListItem):\t%s\n", string(l))
}
return 0
}
decMessage = decMessage[message.Curve25519KeySize*2:]
// meta.MessageType
if meta.MessageType == message.MsgTypeRepost {
log.Datas("STATUS (Process):\tREPOST\n")
// If messageType repost: get padkey,mindelay,maxdelay. Repad
padkey, minDelay, maxDelay := utils.DecodeRepostHeader(decMessage[:utils.RepostHeaderSize])
timePoint := utils.STM(int(minDelay), int(maxDelay))
log.Dataf("STATUS (STM):\t%d %d %d\n", minDelay, maxDelay, timePoint)
repostMsgt := message.RePad(decMessage[utils.RepostHeaderSize:], padkey, GlobalConfigVar.BodyLength)
signHeader := new([message.SignHeaderSize]byte)
copy(signHeader[:], repostMsgt[:message.SignHeaderSize])
details, err := message.VerifySignature(*signHeader, GlobalConfigVar.MinHashCash)
if err != nil {
log.Fatalf("%s\n", err)
return 1
}
msgIDMsg := message.CalcMessageID(repostMsgt)
if *msgIDMsg != details.MsgID {
log.Fatals("MessageID conflict\n")
return 1
}
log.Dataf("STATUS (MessageIDSig):\t%s\n", utils.B58encode(details.MsgID[:]))
log.Dataf("STATUS (PubKeySig):\t%s\n", utils.B58encode(details.PublicKey[:]))
log.Dataf("STATUS (NonceSig):\t%x\n", details.HashCashNonce[:])
log.Dataf("STATUS (BitsSig):\t%d\n", details.HashCashBits)
decMessage = message.EncodeBase64(repostMsgt)
if OptionsVar.Stmdir != "" { // Exist/Dir test done early
filename := fmt.Sprintf("%s%s%d.%s", OptionsVar.Stmdir, string(os.PathSeparator), timePoint, utils.B58encode(msgIDMsg[:]))
log.Dataf("STATUS (STMFile):\t%s\n", filename)
err := utils.WriteNewFile(filename, decMessage)
if err != nil {
log.Fatalf("%s\n", err)
return 1
}
return 0
}
}
err = outputData(OptionsVar.Outfile, decMessage)
if err != nil {
log.Fatalf("Output failed: %s\n", err)
return 1
}
return 0
}
