128 lines
3.2 KiB
Go
128 lines
3.2 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ssh
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import (
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"bytes"
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"crypto"
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"crypto/aes"
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"crypto/rand"
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"testing"
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)
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func TestDefaultCiphersExist(t *testing.T) {
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for _, cipherAlgo := range supportedCiphers {
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if _, ok := cipherModes[cipherAlgo]; !ok {
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t.Errorf("default cipher %q is unknown", cipherAlgo)
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}
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}
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}
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func TestPacketCiphers(t *testing.T) {
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// Still test aes128cbc cipher although it's commented out.
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cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil}
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defer delete(cipherModes, aes128cbcID)
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for cipher := range cipherModes {
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kr := &kexResult{Hash: crypto.SHA1}
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algs := directionAlgorithms{
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Cipher: cipher,
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MAC: "hmac-sha1",
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Compression: "none",
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}
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client, err := newPacketCipher(clientKeys, algs, kr)
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if err != nil {
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t.Errorf("newPacketCipher(client, %q): %v", cipher, err)
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continue
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}
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server, err := newPacketCipher(clientKeys, algs, kr)
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if err != nil {
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t.Errorf("newPacketCipher(client, %q): %v", cipher, err)
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continue
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}
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want := "bla bla"
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input := []byte(want)
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buf := &bytes.Buffer{}
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if err := client.writePacket(0, buf, rand.Reader, input); err != nil {
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t.Errorf("writePacket(%q): %v", cipher, err)
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continue
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}
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packet, err := server.readPacket(0, buf)
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if err != nil {
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t.Errorf("readPacket(%q): %v", cipher, err)
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continue
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}
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if string(packet) != want {
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t.Errorf("roundtrip(%q): got %q, want %q", cipher, packet, want)
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}
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}
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}
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func TestCBCOracleCounterMeasure(t *testing.T) {
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cipherModes[aes128cbcID] = &streamCipherMode{16, aes.BlockSize, 0, nil}
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defer delete(cipherModes, aes128cbcID)
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kr := &kexResult{Hash: crypto.SHA1}
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algs := directionAlgorithms{
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Cipher: aes128cbcID,
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MAC: "hmac-sha1",
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Compression: "none",
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}
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client, err := newPacketCipher(clientKeys, algs, kr)
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if err != nil {
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t.Fatalf("newPacketCipher(client): %v", err)
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}
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want := "bla bla"
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input := []byte(want)
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buf := &bytes.Buffer{}
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if err := client.writePacket(0, buf, rand.Reader, input); err != nil {
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t.Errorf("writePacket: %v", err)
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}
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packetSize := buf.Len()
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buf.Write(make([]byte, 2*maxPacket))
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// We corrupt each byte, but this usually will only test the
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// 'packet too large' or 'MAC failure' cases.
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lastRead := -1
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for i := 0; i < packetSize; i++ {
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server, err := newPacketCipher(clientKeys, algs, kr)
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if err != nil {
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t.Fatalf("newPacketCipher(client): %v", err)
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}
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fresh := &bytes.Buffer{}
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fresh.Write(buf.Bytes())
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fresh.Bytes()[i] ^= 0x01
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before := fresh.Len()
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_, err = server.readPacket(0, fresh)
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if err == nil {
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t.Errorf("corrupt byte %d: readPacket succeeded ", i)
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continue
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}
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if _, ok := err.(cbcError); !ok {
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t.Errorf("corrupt byte %d: got %v (%T), want cbcError", i, err, err)
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continue
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}
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after := fresh.Len()
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bytesRead := before - after
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if bytesRead < maxPacket {
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t.Errorf("corrupt byte %d: read %d bytes, want more than %d", i, bytesRead, maxPacket)
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continue
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}
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if i > 0 && bytesRead != lastRead {
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t.Errorf("corrupt byte %d: read %d bytes, want %d bytes read", i, bytesRead, lastRead)
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}
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lastRead = bytesRead
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}
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}
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