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// SPDX-License-Identifier: GPL-2.0-or-later
#include "fqterm_trace.h"
#include "fqterm_ssh_packet.h"
#include "fqterm_ssh_const.h"
#include "crc32.h"
#include <openssl/bn.h>
namespace FQTerm {
//==============================================================================
//FQTermSSHPacketSender
//==============================================================================
FQTermSSHPacketSender::FQTermSSHPacketSender(int ver)
{
buffer_init(&orig_data);
buffer_init(&data_to_send);
if (ver == 2)
cipher = &ssh_cipher_dummy;
else
cipher = new_3des_ssh1(1);
this->ver = ver;
is_mac_ = false;
mac = NULL;
sequence_no_ = 0;
}
FQTermSSHPacketSender::~FQTermSSHPacketSender()
{
cipher->cleanup(cipher);
if (mac)
mac->cleanup(mac);
buffer_deinit(&data_to_send);
buffer_deinit(&orig_data);
}
void FQTermSSHPacketSender::putString(const char *s, int len)
{
if (len < 0)
len = strlen(s);
putInt(len);
putRawData((const uint8_t *)s, len);
}
void FQTermSSHPacketSender::putBN(BIGNUM *bignum)
{
int bits = BN_num_bits(bignum);
int bin_size = (bits + 7) / 8;
uint8_t buf[bin_size];
int oi;
uint8_t msg[2];
// Get the value of in binary
oi = BN_bn2bin(bignum, buf);
if (oi != bin_size) {
FQ_TRACE("sshbuffer", 0) << "BN_bn2bin() failed: oi = " << oi
<< " != bin_size." << bin_size;
}
// Store the number of bits in the buffer in two bytes, msb first
buffer_append_be16(&orig_data, bits);
// Store the binary data.
putRawData(buf, oi);
}
void FQTermSSHPacketSender::startPacket(uint8_t pkt_type)
{
buffer_clear(&orig_data);
putByte(pkt_type);
}
void FQTermSSHPacketSender::write()
{
makePacket();
emit dataToWrite();
}
void FQTermSSHPacketSender::startEncryption(const u_char *key, const u_char *IV)
{
cipher->init(cipher, key, IV);
}
void FQTermSSHPacketSender::resetEncryption()
{
cipher->started = false;
}
void FQTermSSHPacketSender::startMac(const u_char *key) {
is_mac_ = true;
memcpy(mac->key, key, mac->keySize);
}
void FQTermSSHPacketSender::resetMac() {
is_mac_ = false;
}
//==============================================================================
//FQTermSSHPacketReceiver
//==============================================================================
FQTermSSHPacketReceiver::FQTermSSHPacketReceiver()
{
buffer_init(&recvbuf);
cipher = &ssh_cipher_dummy;
is_mac_ = false;
mac = NULL;
sequence_no_ = 0;
}
FQTermSSHPacketReceiver::~FQTermSSHPacketReceiver()
{
buffer_deinit(&recvbuf);
cipher->cleanup(cipher);
if (mac)
mac->cleanup(mac);
}
void FQTermSSHPacketReceiver::getRawData(char *data, int length)
{
if (buffer_len(&recvbuf) >= length)
buffer_get(&recvbuf, (uint8_t*)data, length);
else
emit packetError("Read too many bytes!");
}
uint8_t FQTermSSHPacketReceiver::getByte()
{
if (buffer_len(&recvbuf) >= 1) {
return buffer_get_u8(&recvbuf);
} else {
emit packetError("Read too many bytes!");
return 0;
}
}
uint32_t FQTermSSHPacketReceiver::getInt()
{
if (buffer_len(&recvbuf) >= 4) {
return buffer_get_u32(&recvbuf);
} else {
emit packetError("Read too many bytes!");
return 0;
}
}
void *FQTermSSHPacketReceiver::getString(int *length)
{
uint32_t l = getInt();
char *data = new char[l+1];
getRawData(data, l);
data[l] = 0;
if (length != NULL)
*length = l;
return data;
}
void FQTermSSHPacketReceiver::getBN(BIGNUM *bignum)
{
int bits, bytes;
u_char buf[2];
u_char *bin;
// Get the number for bits.
if (buffer_len(&recvbuf) >= 2) {
bits = buffer_get_u16(&recvbuf);
} else {
emit packetError("Read too many bytes!");
return;
}
// Compute the number of binary bytes that follow.
bytes = (bits + 7) / 8;
if (bytes > 8 *1024) {
emit packetError("Can't handle BN of size!");
return ;
}
if (buffer_len(&recvbuf) < bytes) {
emit packetError("The input buffer is too small!");
return ;
}
bin = buffer_data(&recvbuf);
BN_bin2bn(bin, bytes, bignum);
buffer_consume(&recvbuf, bytes);
}
void FQTermSSHPacketReceiver::consume(int len)
{
buffer_consume(&recvbuf, len);
}
void FQTermSSHPacketReceiver::startEncryption(const u_char *key, const u_char *IV)
{
cipher->init(cipher, key, IV);
}
void FQTermSSHPacketReceiver::resetEncryption()
{
cipher->started = false;
}
void FQTermSSHPacketReceiver::startMac(const u_char *key) {
is_mac_ = true;
memcpy(mac->key, key, mac->keySize);
}
void FQTermSSHPacketReceiver::resetMac() {
is_mac_ = false;
}
} // namespace FQTerm
#include "fqterm_ssh_packet.moc"
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