iso.c@ 78352

Last change on this file since 78352 was 55123, checked in by vboxsync, 10 years ago
rdesktop 1.8.3 modified for VBox
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File size: 8.3 KB

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1	/* -- c-basic-offset: 8 --
2	rdesktop: A Remote Desktop Protocol client.
3	Protocol services - ISO layer
4	Copyright (C) Matthew Chapman <matthewc.unsw.edu.au> 1999-2008
5	Copyright 2005-2011 Peter Astrand <[email protected]> for Cendio AB
6	Copyright 2012 Henrik Andersson <[email protected]> for Cendio AB
7
8	This program is free software: you can redistribute it and/or modify
9	it under the terms of the GNU General Public License as published by
10	the Free Software Foundation, either version 3 of the License, or
11	(at your option) any later version.
12
13	This program is distributed in the hope that it will be useful,
14	but WITHOUT ANY WARRANTY; without even the implied warranty of
15	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16	GNU General Public License for more details.
17
18	You should have received a copy of the GNU General Public License
19	along with this program. If not, see <http://www.gnu.org/licenses/>.
20	*/
21
22	/*
23	* Oracle GPL Disclaimer: For the avoidance of doubt, except that if any license choice
24	* other than GPL or LGPL is available it will apply instead, Oracle elects to use only
25	* the General Public License version 2 (GPLv2) at this time for any software where
26	* a choice of GPL license versions is made available with the language indicating
27	* that GPLv2 or any later version may be used, or where a choice of which version
28	* of the GPL is applied is otherwise unspecified.
29	*/
30
31	#include "rdesktop.h"
32
33	extern RD_BOOL g_encryption;
34	extern RD_BOOL g_encryption_initial;
35	extern RDP_VERSION g_rdp_version;
36	extern RD_BOOL g_use_password_as_pin;
37
38	static RD_BOOL g_negotiate_rdp_protocol = True;
39
40	extern char *g_sc_csp_name;
41	extern char *g_sc_reader_name;
42	extern char *g_sc_card_name;
43	extern char *g_sc_container_name;
44
45
46	/* Send a self-contained ISO PDU */
47	static void
48	iso_send_msg(uint8 code)
49	{
50	STREAM s;
51
52	s = tcp_init(11);
53
54	out_uint8(s, 3); /* version */
55	out_uint8(s, 0); /* reserved */
56	out_uint16_be(s, 11); /* length */
57
58	out_uint8(s, 6); /* hdrlen */
59	out_uint8(s, code);
60	out_uint16(s, 0); /* dst_ref */
61	out_uint16(s, 0); /* src_ref */
62	out_uint8(s, 0); /* class */
63
64	s_mark_end(s);
65	tcp_send(s);
66	}
67
68	static void
69	iso_send_connection_request(char *username, uint32 neg_proto)
70	{
71	STREAM s;
72	int length = 30 + strlen(username);
73
74	if (g_rdp_version >= RDP_V5 && g_negotiate_rdp_protocol)
75	length += 8;
76
77	s = tcp_init(length);
78
79	out_uint8(s, 3); /* version */
80	out_uint8(s, 0); /* reserved */
81	out_uint16_be(s, length); /* length */
82
83	out_uint8(s, length - 5); /* hdrlen */
84	out_uint8(s, ISO_PDU_CR);
85	out_uint16(s, 0); /* dst_ref */
86	out_uint16(s, 0); /* src_ref */
87	out_uint8(s, 0); /* class */
88
89	out_uint8p(s, "Cookie: mstshash=", strlen("Cookie: mstshash="));
90	out_uint8p(s, username, strlen(username));
91
92	out_uint8(s, 0x0d); /* cookie termination string: CR+LF */
93	out_uint8(s, 0x0a);
94
95	if (g_rdp_version >= RDP_V5 && g_negotiate_rdp_protocol)
96	{
97	/* optional rdp protocol negotiation request for RDPv5 */
98	out_uint8(s, RDP_NEG_REQ);
99	out_uint8(s, 0);
100	out_uint16(s, 8);
101	out_uint32(s, neg_proto);
102	}
103
104	s_mark_end(s);
105	tcp_send(s);
106	}
107
108	/* Receive a message on the ISO layer, return code */
109	static STREAM
110	iso_recv_msg(uint8 * code, uint8 * rdpver)
111	{
112	STREAM s;
113	uint16 length;
114	uint8 version;
115
116	s = tcp_recv(NULL, 4);
117	if (s == NULL)
118	return NULL;
119	in_uint8(s, version);
120	if (rdpver != NULL)
121	*rdpver = version;
122	if (version == 3)
123	{
124	in_uint8s(s, 1); /* pad */
125	in_uint16_be(s, length);
126	}
127	else
128	{
129	in_uint8(s, length);
130	if (length & 0x80)
131	{
132	length &= ~0x80;
133	next_be(s, length);
134	}
135	}
136	if (length < 4)
137	{
138	error("Bad packet header\n");
139	return NULL;
140	}
141	s = tcp_recv(s, length - 4);
142	if (s == NULL)
143	return NULL;
144	if (version != 3)
145	return s;
146	in_uint8s(s, 1); /* hdrlen */
147	in_uint8(s, *code);
148	if (*code == ISO_PDU_DT)
149	{
150	in_uint8s(s, 1); /* eot */
151	return s;
152	}
153	in_uint8s(s, 5); /* dst_ref, src_ref, class */
154	return s;
155	}
156
157	/* Initialise ISO transport data packet */
158	STREAM
159	iso_init(int length)
160	{
161	STREAM s;
162
163	s = tcp_init(length + 7);
164	s_push_layer(s, iso_hdr, 7);
165
166	return s;
167	}
168
169	/* Send an ISO data PDU */
170	void
171	iso_send(STREAM s)
172	{
173	uint16 length;
174
175	s_pop_layer(s, iso_hdr);
176	length = s->end - s->p;
177
178	out_uint8(s, 3); /* version */
179	out_uint8(s, 0); /* reserved */
180	out_uint16_be(s, length);
181
182	out_uint8(s, 2); /* hdrlen */
183	out_uint8(s, ISO_PDU_DT); /* code */
184	out_uint8(s, 0x80); /* eot */
185
186	tcp_send(s);
187	}
188
189	/* Receive ISO transport data packet */
190	STREAM
191	iso_recv(uint8 * rdpver)
192	{
193	STREAM s;
194	uint8 code = 0;
195
196	s = iso_recv_msg(&code, rdpver);
197	if (s == NULL)
198	return NULL;
199	if (rdpver != NULL)
200	if (*rdpver != 3)
201	return s;
202	if (code != ISO_PDU_DT)
203	{
204	error("expected DT, got 0x%x\n", code);
205	return NULL;
206	}
207	return s;
208	}
209
210	/* Establish a connection up to the ISO layer */
211	RD_BOOL
212	iso_connect(char server, char username, char domain, char password,
213	RD_BOOL reconnect, uint32 * selected_protocol)
214	{
215	STREAM s;
216	uint8 code;
217	uint32 neg_proto;
218
219	g_negotiate_rdp_protocol = True;
220
221	neg_proto = PROTOCOL_SSL;
222
223	#ifdef WITH_CREDSSP
224	if (!g_use_password_as_pin)
225	neg_proto \|= PROTOCOL_HYBRID;
226	else if (g_sc_csp_name \|\| g_sc_reader_name \|\| g_sc_card_name \|\| g_sc_container_name)
227	neg_proto \|= PROTOCOL_HYBRID;
228	else
229	warning("Disables CredSSP due to missing smartcard information for SSO.\n");
230	#endif
231
232	retry:
233	*selected_protocol = PROTOCOL_RDP;
234	code = 0;
235
236	if (!tcp_connect(server))
237	return False;
238
239	iso_send_connection_request(username, neg_proto);
240
241	s = iso_recv_msg(&code, NULL);
242	if (s == NULL)
243	return False;
244
245	if (code != ISO_PDU_CC)
246	{
247	error("expected CC, got 0x%x\n", code);
248	tcp_disconnect();
249	return False;
250	}
251
252	if (g_rdp_version >= RDP_V5 && s_check_rem(s, 8))
253	{
254	/* handle RDP_NEG_REQ response */
255	const char *reason = NULL;
256
257	uint8 type = 0, flags = 0;
258	uint16 length = 0;
259	uint32 data = 0;
260
261	in_uint8(s, type);
262	in_uint8(s, flags);
263	in_uint16(s, length);
264	in_uint32(s, data);
265
266	if (type == RDP_NEG_FAILURE)
267	{
268	RD_BOOL retry_without_neg = False;
269
270	switch (data)
271	{
272	case SSL_WITH_USER_AUTH_REQUIRED_BY_SERVER:
273	reason = "SSL with user authentication required by server";
274	break;
275	case SSL_NOT_ALLOWED_BY_SERVER:
276	reason = "SSL not allowed by server";
277	retry_without_neg = True;
278	break;
279	case SSL_CERT_NOT_ON_SERVER:
280	reason = "no valid authentication certificate on server";
281	retry_without_neg = True;
282	break;
283	case INCONSISTENT_FLAGS:
284	reason = "inconsistent negotiation flags";
285	break;
286	case SSL_REQUIRED_BY_SERVER:
287	reason = "SSL required by server";
288	break;
289	case HYBRID_REQUIRED_BY_SERVER:
290	reason = "CredSSP required by server";
291	break;
292	default:
293	reason = "unknown reason";
294	}
295
296	tcp_disconnect();
297
298	if (retry_without_neg)
299	{
300	fprintf(stderr,
301	"Failed to negotiate protocol, retrying with plain RDP.\n");
302	g_negotiate_rdp_protocol = False;
303	goto retry;
304	}
305
306	fprintf(stderr, "Failed to connect, %s.\n", reason);
307	return False;
308	}
309
310	if (type != RDP_NEG_RSP)
311	{
312	tcp_disconnect();
313	error("Expected RDP_NEG_RSP, got type = 0x%x\n", type);
314	return False;
315	}
316
317	/* handle negotiation response */
318	if (data == PROTOCOL_SSL)
319	{
320	if (!tcp_tls_connect())
321	{
322	/* failed to connect using cssp, let retry with plain TLS */
323	tcp_disconnect();
324	neg_proto = PROTOCOL_RDP;
325	goto retry;
326	}
327	/* do not use encryption when using TLS */
328	g_encryption = False;
329	fprintf(stderr, "Connection established using SSL.\n");
330	}
331	#ifdef WITH_CREDSSP
332	else if (data == PROTOCOL_HYBRID)
333	{
334	if (!cssp_connect(server, username, domain, password, s))
335	{
336	/* failed to connect using cssp, let retry with plain TLS */
337	tcp_disconnect();
338	neg_proto = PROTOCOL_SSL;
339	goto retry;
340	}
341
342	/* do not use encryption when using TLS */
343	fprintf(stderr, "Connection established using CredSSP.\n");
344	g_encryption = False;
345	}
346	#endif
347	else if (data == PROTOCOL_RDP)
348	{
349	fprintf(stderr, "Connection established using plain RDP.\n");
350	}
351	else if (data != PROTOCOL_RDP)
352	{
353	tcp_disconnect();
354	error("Unexpected protocol in negotiation response, got data = 0x%x.\n",
355	data);
356	return False;
357	}
358
359	*selected_protocol = data;
360	}
361	return True;
362	}
363
364	/* Disconnect from the ISO layer */
365	void
366	iso_disconnect(void)
367	{
368	iso_send_msg(ISO_PDU_DR);
369	tcp_disconnect();
370	}
371
372	/* reset the state to support reconnecting */
373	void
374	iso_reset_state(void)
375	{
376	g_encryption = g_encryption_initial;
377	tcp_reset_state();
378	}

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source: vbox/trunk/src/VBox/RDP/client-1.8.4/iso.c@ 78352

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