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package main
import (
"flag"
"github.com/keybase/saltpack"
"github.com/keybase/saltpack/basic"
"github.com/tonistiigi/units"
"io"
"net"
"net/netip"
"os"
"git.samanthony.xyz/hose/handshake"
"git.samanthony.xyz/hose/hosts"
"git.samanthony.xyz/hose/key"
hose_net "git.samanthony.xyz/hose/net"
"git.samanthony.xyz/hose/util"
)
const (
port = 60321
network = "tcp"
usage = "Usage: hose <-handshake <rhost> | -r | -s <rhost>>"
)
var (
handshakeHost = flag.String("handshake", "", "exchange public keys with remote host")
recvFlag = flag.Bool("r", false, "receive")
sendHost = flag.String("s", "", "send to remote host")
)
func main() {
flag.Parse()
if *handshakeHost != "" {
if err := handshake.Handshake(*handshakeHost); err != nil {
util.Eprintf("%v\n", err)
}
} else if *recvFlag {
if err := recv(); err != nil {
util.Eprintf("%v\n", err)
}
} else if *sendHost != "" {
if err := send(*sendHost); err != nil {
util.Eprintf("%v\n", err)
}
} else {
util.Logf("%s", usage)
flag.Usage()
os.Exit(1)
}
}
// recv pipes data from the remote host to stdout.
func recv() error {
// Load private decryption key.
keyring := key.NewKeyring()
if err := loadBoxKeypair(keyring); err != nil {
return err
}
// Accept connection from remote host.
conn, err := hose_net.AcceptConnection(network, port)
defer conn.Close()
util.Logf("accepted connection from %s", conn.RemoteAddr())
// Load remote host's signature verification key.
host, err := lookupHost(conn)
if err != nil {
return err
}
keyring.ImportSigPublicKey(host.SigPublicKey)
// Decrypt and verify stream.
_, plaintext, err := saltpack.NewSigncryptOpenStream(conn, keyring, nil)
if err != nil {
return err
}
// Read data.
n, err := io.Copy(os.Stdout, plaintext)
util.Logf("received %.2f", units.Bytes(n)*units.B)
return err
}
// loadBoxKeypair reads the local encryption/decryption keypair from disc and imports it into the keyring.
func loadBoxKeypair(keyring *key.Keyring) error {
boxKeypair, err := key.LoadBoxKeypair()
if err != nil {
return err
}
keyring.ImportBoxKeypair(boxKeypair)
return nil
}
// lookupHost searches for a remote host in the known hosts file.
func lookupHost(conn net.Conn) (hosts.Host, error) {
rhost, _, err := net.SplitHostPort(conn.RemoteAddr().String())
if err != nil {
return hosts.Host{}, err
}
raddr, err := netip.ParseAddr(rhost)
if err != nil {
return hosts.Host{}, err
}
return hosts.Lookup(raddr)
}
// send pipes data from stdin to the remote host.
func send(rHostName string) error {
var keyCreator basic.EphemeralKeyCreator
// Load sender signing keypair.
util.Logf("loading signing key")
sigKeypair, err := key.LoadSigKeypair()
if err != nil {
return err
}
// Create symmetric session key.
sessionKey, err := key.NewReceiverSymmetricKey()
if err != nil {
return err
}
// Load receiver encryption key.
util.Logf("loading encryption key for %s", rHostName)
rAddr, err := netip.ParseAddr(rHostName)
if err != nil {
return err
}
rHost, err := hosts.Lookup(rAddr)
if err != nil {
return err
}
// Connect to remote host.
rAddrPort := netip.AddrPortFrom(rAddr, port)
util.Logf("connecting to %s", rAddrPort)
conn, err := net.Dial(network, rAddrPort.String())
if err != nil {
return err
}
defer conn.Close()
// Create signcrypted stream.
util.Logf("signcrypting stream")
rcvrBoxKeys := []saltpack.BoxPublicKey{rHost.BoxPublicKey}
rcvrSymmetricKeys := []saltpack.ReceiverSymmetricKey{sessionKey}
plaintext, err := saltpack.NewSigncryptSealStream(conn, keyCreator, sigKeypair, rcvrBoxKeys, rcvrSymmetricKeys)
if err != nil {
return err
}
defer plaintext.Close()
// Send data.
n, err := io.Copy(plaintext, os.Stdin)
util.Logf("sent %.2f", units.Bytes(n)*units.B)
return err
}
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