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cssp: Separate client/server version handling (#4502)

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This commit is contained in:
Martin Fleisz 2018-03-23 12:12:08 +01:00
parent 15fb917267
commit eb1f693fc4
2 changed files with 22 additions and 9 deletions
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30
libfreerdp/core/nla.c
View File

@ -535,7 +535,7 @@ static int nla_client_recv(rdpNla* nla)
return -1;
}
if (nla->version < 5)
if (nla->peerVersion < 5)
nla->status = nla_encrypt_public_key_echo(nla);
else
nla->status = nla_encrypt_public_key_hash(nla);
@ -565,7 +565,7 @@ static int nla_client_recv(rdpNla* nla)
else if (nla->state == NLA_STATE_PUB_KEY_AUTH)
{
/* Verify Server Public Key Echo */
if (nla->version < 5)
if (nla->peerVersion < 5)
nla->status = nla_decrypt_public_key_echo(nla);
else
nla->status = nla_decrypt_public_key_hash(nla);
@ -887,7 +887,7 @@ static int nla_server_authenticate(rdpNla* nla)
return -1;
}
if (nla->version < 5)
if (nla->peerVersion < 5)
nla->status = nla_decrypt_public_key_echo(nla);
else
nla->status = nla_decrypt_public_key_hash(nla);
@ -903,7 +903,7 @@ static int nla_server_authenticate(rdpNla* nla)
nla->negoToken.pvBuffer = NULL;
nla->negoToken.cbBuffer = 0;
if (nla->version < 5)
if (nla->peerVersion < 5)
nla->status = nla_encrypt_public_key_echo(nla);
else
nla->status = nla_encrypt_public_key_hash(nla);
@ -1857,7 +1857,7 @@ BOOL nla_send(rdpNla* nla)
client_nonce_length = (nla->ClientNonce.cbBuffer > 0) ? nla_sizeof_client_nonce(
nla->ClientNonce.cbBuffer) : 0;
if (nla->version >= 3 && nla->version != 5 && nla->errorCode != 0)
if (nla->peerVersion >= 3 && nla->peerVersion != 5 && nla->errorCode != 0)
{
error_code_length = ber_sizeof_integer(nla->errorCode);
error_code_context_length = ber_sizeof_contextual_tag(error_code_length);
@ -1948,8 +1948,20 @@ static int nla_decode_ts_request(rdpNla* nla, wStream* s)
return -1;
}
if (version < nla->version)
nla->version = version;
if (nla->peerVersion == 0)
{
WLog_DBG(TAG, "CredSSP protocol support %"PRIu32", peer supports %"PRIu32,
nla->version, version);
nla->peerVersion = version;
}
/* if the peer suddenly changed its version - kick it */
if (nla->peerVersion != version)
{
WLog_ERR(TAG, "CredSSP peer changed protocol version from %"PRIu32" to %"PRIu32,
nla->peerVersion, version);
return -1;
}
/* [1] negoTokens (NegoData) */
if (ber_read_contextual_tag(s, 1, &length, TRUE) != FALSE)
@ -1999,7 +2011,7 @@ static int nla_decode_ts_request(rdpNla* nla, wStream* s)
}
/* [4] errorCode (INTEGER) */
if (nla->version >= 3)
if (nla->peerVersion >= 3)
{
if (ber_read_contextual_tag(s, 4, &length, TRUE) != FALSE)
{
@ -2007,7 +2019,7 @@ static int nla_decode_ts_request(rdpNla* nla, wStream* s)
return -1;
}
if (nla->version >= 5)
if (nla->peerVersion >= 5)
{
if (ber_read_contextual_tag(s, 5, &length, TRUE) != FALSE)
{

1
libfreerdp/core/nla.h
View File

@ -66,6 +66,7 @@ struct rdp_nla
SEC_CHAR* packageName;
#endif
UINT32 version;
UINT32 peerVersion;
UINT32 errorCode;
ULONG fContextReq;
ULONG pfContextAttr;