void rdp_write_client_auto_reconnect_cookie(wStream* s, rdpSettings* settings)
{
CryptoHmac hmac;
BYTE nullRandom[32];
BYTE cryptSecurityVerifier[16];
ARC_CS_PRIVATE_PACKET* autoReconnectCookie;
autoReconnectCookie = settings->ClientAutoReconnectCookie;
/* SecurityVerifier = HMAC(AutoReconnectRandom, ClientRandom) */
hmac = crypto_hmac_new();
ZeroMemory(nullRandom, sizeof(nullRandom));
crypto_hmac_md5_init(hmac, autoReconnectCookie->securityVerifier, 16);
if (settings->ClientRandomLength > 0)
crypto_hmac_update(hmac, settings->ClientRandom, settings->ClientRandomLength);
else
crypto_hmac_update(hmac, nullRandom, sizeof(nullRandom));
crypto_hmac_final(hmac, cryptSecurityVerifier, 16);
crypto_hmac_free(hmac);
Stream_Write_UINT32(s, autoReconnectCookie->cbLen); /* cbLen (4 bytes) */
Stream_Write_UINT32(s, autoReconnectCookie->version); /* version (4 bytes) */
Stream_Write_UINT32(s, autoReconnectCookie->logonId); /* LogonId (4 bytes) */
Stream_Write(s, cryptSecurityVerifier, 16); /* SecurityVerifier */
}
BOOL rdp_compute_client_auto_reconnect_cookie(rdpRdp* rdp)
{
CryptoHmac hmac;
BYTE ClientRandom[32];
BYTE AutoReconnectRandom[32];
ARC_SC_PRIVATE_PACKET* serverCookie;
ARC_CS_PRIVATE_PACKET* clientCookie;
rdpSettings* settings = rdp->settings;
serverCookie = settings->ServerAutoReconnectCookie;
clientCookie = settings->ClientAutoReconnectCookie;
clientCookie->cbLen = 28;
clientCookie->version = serverCookie->version;
clientCookie->logonId = serverCookie->logonId;
ZeroMemory(clientCookie->securityVerifier, 16);
ZeroMemory(AutoReconnectRandom, sizeof(AutoReconnectRandom));
CopyMemory(AutoReconnectRandom, serverCookie->arcRandomBits, 16);
ZeroMemory(ClientRandom, sizeof(ClientRandom));
if (settings->SelectedProtocol == PROTOCOL_RDP)
CopyMemory(ClientRandom, settings->ClientRandom, settings->ClientRandomLength);
hmac = crypto_hmac_new();
if (!hmac)
return FALSE;
/* SecurityVerifier = HMAC_MD5(AutoReconnectRandom, ClientRandom) */
if (!crypto_hmac_md5_init(hmac, AutoReconnectRandom, 16))
return FALSE;
crypto_hmac_update(hmac, ClientRandom, 32);
crypto_hmac_final(hmac, clientCookie->securityVerifier, 16);
crypto_hmac_free(hmac);
return TRUE;
}
BOOL rdp_server_establish_keys(rdpRdp* rdp, wStream* s)
{
BYTE client_random[64]; /* Should be only 32 after successful decryption, but on failure might take up to 64 bytes. */
BYTE crypt_client_random[256 + 8];
UINT32 rand_len, key_len;
UINT16 channel_id, length, sec_flags;
BYTE* mod;
BYTE* priv_exp;
if (!rdp->settings->DisableEncryption)
{
/* No RDP Security. */
return TRUE;
}
if (!rdp_read_header(rdp, s, &length, &channel_id))
{
fprintf(stderr, "rdp_server_establish_keys: invalid RDP header\n");
return FALSE;
}
if (!rdp_read_security_header(s, &sec_flags))
return FALSE;
if ((sec_flags & SEC_EXCHANGE_PKT) == 0)
{
fprintf(stderr, "rdp_server_establish_keys: missing SEC_EXCHANGE_PKT in security header\n");
return FALSE;
}
if (Stream_GetRemainingLength(s) < 4)
return FALSE;
Stream_Read_UINT32(s, rand_len);
if (Stream_GetRemainingLength(s) < rand_len + 8) /* include 8 bytes of padding */
return FALSE;
key_len = rdp->settings->RdpServerRsaKey->ModulusLength;
if (rand_len != key_len + 8)
{
fprintf(stderr, "rdp_server_establish_keys: invalid encrypted client random length\n");
return FALSE;
}
ZeroMemory(crypt_client_random, sizeof(crypt_client_random));
Stream_Read(s, crypt_client_random, rand_len);
/* 8 zero bytes of padding */
Stream_Seek(s, 8);
mod = rdp->settings->RdpServerRsaKey->Modulus;
priv_exp = rdp->settings->RdpServerRsaKey->PrivateExponent;
crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random);
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(client_random, rdp))
{
return FALSE;
}
rdp->do_crypt = TRUE;
if (rdp->settings->SaltedChecksum)
rdp->do_secure_checksum = TRUE;
if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
rdp->fips_hmac = crypto_hmac_new();
return TRUE;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
return TRUE;
}
static BOOL rdp_client_establish_keys(rdpRdp* rdp)
{
BYTE* mod;
BYTE* exp;
wStream* s;
UINT32 length;
UINT32 key_len;
BYTE crypt_client_random[256 + 8];
if (!rdp->settings->DisableEncryption)
{
/* no RDP encryption */
return TRUE;
}
/* encrypt client random */
if (rdp->settings->ClientRandom)
free(rdp->settings->ClientRandom);
rdp->settings->ClientRandom = malloc(CLIENT_RANDOM_LENGTH);
if (!rdp->settings->ClientRandom)
return FALSE;
ZeroMemory(crypt_client_random, sizeof(crypt_client_random));
crypto_nonce(rdp->settings->ClientRandom, CLIENT_RANDOM_LENGTH);
key_len = rdp->settings->RdpServerCertificate->cert_info.ModulusLength;
mod = rdp->settings->RdpServerCertificate->cert_info.Modulus;
exp = rdp->settings->RdpServerCertificate->cert_info.exponent;
crypto_rsa_public_encrypt(rdp->settings->ClientRandom, CLIENT_RANDOM_LENGTH, key_len, mod, exp, crypt_client_random);
/* send crypt client random to server */
length = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + key_len + 8;
s = Stream_New(NULL, length);
rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID);
rdp_write_security_header(s, SEC_EXCHANGE_PKT);
length = key_len + 8;
Stream_Write_UINT32(s, length);
Stream_Write(s, crypt_client_random, length);
Stream_SealLength(s);
if (transport_write(rdp->mcs->transport, s) < 0)
{
return FALSE;
}
Stream_Free(s, TRUE);
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(rdp->settings->ClientRandom, rdp))
{
return FALSE;
}
rdp->do_crypt = TRUE;
if (rdp->settings->SaltedChecksum)
rdp->do_secure_checksum = TRUE;
if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
rdp->fips_hmac = crypto_hmac_new();
return TRUE;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
return TRUE;
}
static boolean rdp_server_establish_keys(rdpRdp* rdp, STREAM* s)
{
uint8 client_random[64]; /* Should be only 32 after successfull decryption, but on failure might take up to 64 bytes. */
uint8 crypt_client_random[256 + 8];
uint32 rand_len, key_len;
uint16 channel_id, length, sec_flags;
uint8* mod;
uint8* priv_exp;
if (rdp->settings->encryption == false)
{
/* No RDP Security. */
return true;
}
if (!rdp_read_header(rdp, s, &length, &channel_id))
{
printf("rdp_server_establish_keys: invalid RDP header\n");
return false;
}
rdp_read_security_header(s, &sec_flags);
if ((sec_flags & SEC_EXCHANGE_PKT) == 0)
{
printf("rdp_server_establish_keys: missing SEC_EXCHANGE_PKT in security header\n");
return false;
}
stream_read_uint32(s, rand_len);
key_len = rdp->settings->server_key->modulus.length;
if (rand_len != key_len + 8)
{
printf("rdp_server_establish_keys: invalid encrypted client random length\n");
return false;
}
memset(crypt_client_random, 0, sizeof(crypt_client_random));
stream_read(s, crypt_client_random, rand_len);
/* 8 zero bytes of padding */
stream_seek(s, 8);
mod = rdp->settings->server_key->modulus.data;
priv_exp = rdp->settings->server_key->private_exponent.data;
crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random);
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(client_random, rdp))
{
return false;
}
rdp->do_crypt = true;
if (rdp->settings->salted_checksum)
rdp->do_secure_checksum = true;
if (rdp->settings->encryption_method == ENCRYPTION_METHOD_FIPS)
{
uint8 fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
rdp->fips_hmac = crypto_hmac_new();
return true;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
return true;
}
static boolean rdp_client_establish_keys(rdpRdp* rdp)
{
uint8 client_random[CLIENT_RANDOM_LENGTH];
uint8 crypt_client_random[256 + 8];
uint32 key_len;
uint8* mod;
uint8* exp;
uint32 length;
STREAM* s;
if (rdp->settings->encryption == false)
{
/* no RDP encryption */
return true;
}
/* encrypt client random */
memset(crypt_client_random, 0, sizeof(crypt_client_random));
crypto_nonce(client_random, sizeof(client_random));
key_len = rdp->settings->server_cert->cert_info.modulus.length;
mod = rdp->settings->server_cert->cert_info.modulus.data;
exp = rdp->settings->server_cert->cert_info.exponent;
crypto_rsa_public_encrypt(client_random, sizeof(client_random), key_len, mod, exp, crypt_client_random);
/* send crypt client random to server */
length = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + key_len + 8;
s = transport_send_stream_init(rdp->mcs->transport, length);
rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID);
rdp_write_security_header(s, SEC_EXCHANGE_PKT);
length = key_len + 8;
stream_write_uint32(s, length);
stream_write(s, crypt_client_random, length);
if (transport_write(rdp->mcs->transport, s) < 0)
{
return false;
}
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(client_random, rdp))
{
return false;
}
rdp->do_crypt = true;
if (rdp->settings->salted_checksum)
rdp->do_secure_checksum = true;
if (rdp->settings->encryption_method == ENCRYPTION_METHOD_FIPS)
{
uint8 fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
rdp->fips_hmac = crypto_hmac_new();
return true;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
return true;
}
static boolean rdp_establish_keys(rdpRdp* rdp)
{
uint8 client_random[32];
uint8 crypt_client_random[256 + 8];
uint32 key_len;
uint8* mod;
uint8* exp;
uint32 length;
STREAM* s;
if (rdp->settings->encryption == False)
{
/* no RDP encryption */
return True;
}
/* encrypt client random */
memset(crypt_client_random, 0, sizeof(crypt_client_random));
memset(client_random, 0x5e, 32);
crypto_nonce(client_random, 32);
key_len = rdp->settings->server_cert->cert_info.modulus.length;
mod = rdp->settings->server_cert->cert_info.modulus.data;
exp = rdp->settings->server_cert->cert_info.exponent;
crypto_rsa_encrypt(client_random, 32, key_len, mod, exp, crypt_client_random);
/* send crypt client random to server */
length = 7 + 8 + 4 + 4 + key_len + 8;
s = transport_send_stream_init(rdp->mcs->transport, length);
tpkt_write_header(s, length);
tpdu_write_header(s, 2, 0xf0);
per_write_choice(s, DomainMCSPDU_SendDataRequest << 2);
per_write_integer16(s, rdp->mcs->user_id, MCS_BASE_CHANNEL_ID);
per_write_integer16(s, MCS_GLOBAL_CHANNEL_ID, 0);
stream_write_uint8(s, 0x70);
length = (4 + 4 + key_len + 8) | 0x8000;
stream_write_uint16_be(s, length);
stream_write_uint32(s, 1); /* SEC_CLIENT_RANDOM */
length = key_len + 8;
stream_write_uint32(s, length);
memcpy(s->p, crypt_client_random, length);
stream_seek(s, length);
if (transport_write(rdp->mcs->transport, s) < 0)
{
return False;
}
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(client_random, rdp))
{
return False;
}
rdp->do_crypt = True;
if (rdp->settings->encryption_method == ENCRYPTION_METHOD_FIPS)
{
uint8 fips_ivec[8] = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
rdp->fips_hmac = crypto_hmac_new();
return True;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
return True;
}
BOOL rdp_server_establish_keys(rdpRdp* rdp, wStream* s)
{
BYTE* client_random = NULL;
BYTE* crypt_client_random = NULL;
UINT32 rand_len, key_len;
UINT16 channel_id, length, sec_flags;
BYTE* mod;
BYTE* priv_exp;
BOOL ret = FALSE;
if (!rdp->settings->DisableEncryption)
{
/* No RDP Security. */
return TRUE;
}
if (!rdp_read_header(rdp, s, &length, &channel_id))
{
WLog_ERR(TAG, "invalid RDP header");
return FALSE;
}
if (!rdp_read_security_header(s, &sec_flags))
{
WLog_ERR(TAG, "invalid security header");
return FALSE;
}
if ((sec_flags & SEC_EXCHANGE_PKT) == 0)
{
WLog_ERR(TAG, "missing SEC_EXCHANGE_PKT in security header");
return FALSE;
}
rdp->do_crypt_license = (sec_flags & SEC_LICENSE_ENCRYPT_SC) != 0 ? TRUE : FALSE;
if (Stream_GetRemainingLength(s) < 4)
return FALSE;
Stream_Read_UINT32(s, rand_len);
/* rand_len already includes 8 bytes of padding */
if (Stream_GetRemainingLength(s) < rand_len)
return FALSE;
key_len = rdp->settings->RdpServerRsaKey->ModulusLength;
client_random = malloc(key_len);
if (!client_random)
return FALSE;
if (rand_len != key_len + 8)
{
WLog_ERR(TAG, "invalid encrypted client random length");
goto end2;
}
crypt_client_random = calloc(1, rand_len);
if (!crypt_client_random)
goto end2;
Stream_Read(s, crypt_client_random, rand_len);
mod = rdp->settings->RdpServerRsaKey->Modulus;
priv_exp = rdp->settings->RdpServerRsaKey->PrivateExponent;
crypto_rsa_private_decrypt(crypt_client_random, rand_len - 8, key_len, mod, priv_exp, client_random);
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(client_random, rdp))
{
goto end;
}
rdp->do_crypt = TRUE;
if (rdp->settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
if (!rdp->fips_encrypt)
{
WLog_ERR(TAG, "unable to allocate des3 encrypt key");
goto end;
}
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
if (!rdp->fips_decrypt)
{
WLog_ERR(TAG, "unable to allocate des3 decrypt key");
goto end;
}
rdp->fips_hmac = crypto_hmac_new();
if (!rdp->fips_hmac)
{
WLog_ERR(TAG, "unable to allocate fips hmac");
goto end;
}
ret = TRUE;
goto end;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
if (!rdp->rc4_decrypt_key)
{
WLog_ERR(TAG, "unable to allocate rc4 decrypt key");
goto end;
}
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
if (!rdp->rc4_encrypt_key)
{
WLog_ERR(TAG, "unable to allocate rc4 encrypt key");
goto end;
}
ret = TRUE;
end:
if (crypt_client_random)
free(crypt_client_random);
end2:
if (client_random)
free(client_random);
return ret;
}
static BOOL rdp_client_establish_keys(rdpRdp* rdp)
{
BYTE* mod;
BYTE* exp;
wStream* s;
UINT32 length;
UINT32 key_len;
int status = 0;
BOOL ret = FALSE;
rdpSettings* settings;
BYTE* crypt_client_random = NULL;
settings = rdp->settings;
if (!settings->DisableEncryption)
{
/* no RDP encryption */
return TRUE;
}
/* encrypt client random */
if (settings->ClientRandom)
free(settings->ClientRandom);
settings->ClientRandomLength = CLIENT_RANDOM_LENGTH;
settings->ClientRandom = malloc(settings->ClientRandomLength);
if (!settings->ClientRandom)
return FALSE;
crypto_nonce(settings->ClientRandom, settings->ClientRandomLength);
key_len = settings->RdpServerCertificate->cert_info.ModulusLength;
mod = settings->RdpServerCertificate->cert_info.Modulus;
exp = settings->RdpServerCertificate->cert_info.exponent;
/*
* client random must be (bitlen / 8) + 8 - see [MS-RDPBCGR] 5.3.4.1
* for details
*/
crypt_client_random = calloc(1, key_len + 8);
if (!crypt_client_random)
return FALSE;
crypto_rsa_public_encrypt(settings->ClientRandom, settings->ClientRandomLength, key_len, mod, exp, crypt_client_random);
/* send crypt client random to server */
length = RDP_PACKET_HEADER_MAX_LENGTH + RDP_SECURITY_HEADER_LENGTH + 4 + key_len + 8;
s = Stream_New(NULL, length);
rdp_write_header(rdp, s, length, MCS_GLOBAL_CHANNEL_ID);
rdp_write_security_header(s, SEC_EXCHANGE_PKT | SEC_LICENSE_ENCRYPT_SC);
length = key_len + 8;
Stream_Write_UINT32(s, length);
Stream_Write(s, crypt_client_random, length);
Stream_SealLength(s);
status = transport_write(rdp->mcs->transport, s);
Stream_Free(s, TRUE);
if (status < 0)
goto end;
rdp->do_crypt_license = TRUE;
/* now calculate encrypt / decrypt and update keys */
if (!security_establish_keys(settings->ClientRandom, rdp))
goto end;
rdp->do_crypt = TRUE;
if (settings->SaltedChecksum)
rdp->do_secure_checksum = TRUE;
if (settings->EncryptionMethods == ENCRYPTION_METHOD_FIPS)
{
rdp->fips_encrypt = crypto_des3_encrypt_init(rdp->fips_encrypt_key, fips_ivec);
if (!rdp->fips_encrypt)
{
WLog_ERR(TAG, "unable to allocate des3 encrypt key");
goto end;
}
rdp->fips_decrypt = crypto_des3_decrypt_init(rdp->fips_decrypt_key, fips_ivec);
if (!rdp->fips_decrypt)
{
WLog_ERR(TAG, "unable to allocate des3 decrypt key");
goto end;
}
rdp->fips_hmac = crypto_hmac_new();
if (!rdp->fips_hmac)
{
WLog_ERR(TAG, "unable to allocate fips hmac");
goto end;
}
ret = TRUE;
goto end;
}
rdp->rc4_decrypt_key = crypto_rc4_init(rdp->decrypt_key, rdp->rc4_key_len);
if (!rdp->rc4_decrypt_key)
{
WLog_ERR(TAG, "unable to allocate rc4 decrypt key");
goto end;
}
rdp->rc4_encrypt_key = crypto_rc4_init(rdp->encrypt_key, rdp->rc4_key_len);
if (!rdp->rc4_encrypt_key)
{
WLog_ERR(TAG, "unable to allocate rc4 encrypt key");
goto end;
}
ret = TRUE;
end:
if (crypt_client_random)
free(crypt_client_random);
return ret;
}
void rdp_write_extended_info_packet(wStream* s, rdpSettings* settings)
{
int clientAddressFamily;
WCHAR* clientAddress = NULL;
int cbClientAddress;
WCHAR* clientDir = NULL;
int cbClientDir;
int cbAutoReconnectLen;
clientAddressFamily = settings->IPv6Enabled ? ADDRESS_FAMILY_INET6 : ADDRESS_FAMILY_INET;
cbClientAddress = ConvertToUnicode(CP_UTF8, 0, settings->ClientAddress, -1, &clientAddress, 0) * 2;
cbClientDir = ConvertToUnicode(CP_UTF8, 0, settings->ClientDir, -1, &clientDir, 0) * 2;
cbAutoReconnectLen = (int) settings->ServerAutoReconnectCookie->cbLen;
Stream_Write_UINT16(s, clientAddressFamily); /* clientAddressFamily */
Stream_Write_UINT16(s, cbClientAddress + 2); /* cbClientAddress */
if (cbClientAddress > 0)
Stream_Write(s, clientAddress, cbClientAddress); /* clientAddress */
Stream_Write_UINT16(s, 0);
Stream_Write_UINT16(s, cbClientDir + 2); /* cbClientDir */
if (cbClientDir > 0)
Stream_Write(s, clientDir, cbClientDir); /* clientDir */
Stream_Write_UINT16(s, 0);
rdp_write_client_time_zone(s, settings); /* clientTimeZone */
Stream_Write_UINT32(s, 0); /* clientSessionId, should be set to 0 */
freerdp_performance_flags_make(settings);
Stream_Write_UINT32(s, settings->PerformanceFlags); /* performanceFlags */
Stream_Write_UINT16(s, cbAutoReconnectLen); /* cbAutoReconnectLen */
if (cbAutoReconnectLen > 0)
{
CryptoHmac hmac;
ARC_SC_PRIVATE_PACKET* serverCookie;
ARC_CS_PRIVATE_PACKET* clientCookie;
WLog_DBG(TAG, "Sending auto reconnect");
serverCookie = settings->ServerAutoReconnectCookie;
clientCookie = settings->ClientAutoReconnectCookie;
clientCookie->cbLen = serverCookie->cbLen;
clientCookie->version = serverCookie->version;
clientCookie->logonId = serverCookie->logonId;
hmac = crypto_hmac_new();
if (!hmac)
{
WLog_ERR(TAG, "unable to allocate hmac");
goto out_free;
}
crypto_hmac_md5_init(hmac, serverCookie->arcRandomBits, 16);
if (settings->SelectedProtocol == PROTOCOL_RDP)
{
crypto_hmac_update(hmac, (BYTE*) (settings->ClientRandom), 32);
}
else
{
/* Anthony Tong's version had 16 zeroes here; I'm not sure why.
* I do know that 16 did not reconnect correctly vs Win2008RDVH,
* and 32 did.
*/
const BYTE zeros[32] = { 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0,
0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 };
crypto_hmac_update(hmac, zeros, 32);
}
crypto_hmac_final(hmac, clientCookie->securityVerifier, 16);
rdp_write_client_auto_reconnect_cookie(s, settings); /* autoReconnectCookie */
/* mark as used */
settings->ServerAutoReconnectCookie->cbLen = 0;
crypto_hmac_free(hmac);
}
/* reserved1 (2 bytes) */
/* reserved2 (2 bytes) */
out_free:
free(clientAddress);
free(clientDir);
}
