root / vnc-auth-vencrypt.c @ 9c22a623
History | View | Annotate | Download (5.6 kB)
1 |
/*
|
---|---|
2 |
* QEMU VNC display driver: VeNCrypt authentication setup
|
3 |
*
|
4 |
* Copyright (C) 2006 Anthony Liguori <anthony@codemonkey.ws>
|
5 |
* Copyright (C) 2006 Fabrice Bellard
|
6 |
* Copyright (C) 2009 Red Hat, Inc
|
7 |
*
|
8 |
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
9 |
* of this software and associated documentation files (the "Software"), to deal
|
10 |
* in the Software without restriction, including without limitation the rights
|
11 |
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
12 |
* copies of the Software, and to permit persons to whom the Software is
|
13 |
* furnished to do so, subject to the following conditions:
|
14 |
*
|
15 |
* The above copyright notice and this permission notice shall be included in
|
16 |
* all copies or substantial portions of the Software.
|
17 |
*
|
18 |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
19 |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
20 |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
21 |
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
22 |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
23 |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
24 |
* THE SOFTWARE.
|
25 |
*/
|
26 |
|
27 |
#include "vnc.h" |
28 |
|
29 |
|
30 |
static void start_auth_vencrypt_subauth(VncState *vs) |
31 |
{ |
32 |
switch (vs->vd->subauth) {
|
33 |
case VNC_AUTH_VENCRYPT_TLSNONE:
|
34 |
case VNC_AUTH_VENCRYPT_X509NONE:
|
35 |
VNC_DEBUG("Accept TLS auth none\n");
|
36 |
vnc_write_u32(vs, 0); /* Accept auth completion */ |
37 |
start_client_init(vs); |
38 |
break;
|
39 |
|
40 |
case VNC_AUTH_VENCRYPT_TLSVNC:
|
41 |
case VNC_AUTH_VENCRYPT_X509VNC:
|
42 |
VNC_DEBUG("Start TLS auth VNC\n");
|
43 |
start_auth_vnc(vs); |
44 |
break;
|
45 |
|
46 |
#ifdef CONFIG_VNC_SASL
|
47 |
case VNC_AUTH_VENCRYPT_TLSSASL:
|
48 |
case VNC_AUTH_VENCRYPT_X509SASL:
|
49 |
VNC_DEBUG("Start TLS auth SASL\n");
|
50 |
return start_auth_sasl(vs);
|
51 |
#endif /* CONFIG_VNC_SASL */ |
52 |
|
53 |
default: /* Should not be possible, but just in case */ |
54 |
VNC_DEBUG("Reject subauth %d server bug\n", vs->vd->auth);
|
55 |
vnc_write_u8(vs, 1);
|
56 |
if (vs->minor >= 8) { |
57 |
static const char err[] = "Unsupported authentication type"; |
58 |
vnc_write_u32(vs, sizeof(err));
|
59 |
vnc_write(vs, err, sizeof(err));
|
60 |
} |
61 |
vnc_client_error(vs); |
62 |
} |
63 |
} |
64 |
|
65 |
static void vnc_tls_handshake_io(void *opaque); |
66 |
|
67 |
static int vnc_start_vencrypt_handshake(struct VncState *vs) { |
68 |
int ret;
|
69 |
|
70 |
if ((ret = gnutls_handshake(vs->tls.session)) < 0) { |
71 |
if (!gnutls_error_is_fatal(ret)) {
|
72 |
VNC_DEBUG("Handshake interrupted (blocking)\n");
|
73 |
if (!gnutls_record_get_direction(vs->tls.session))
|
74 |
qemu_set_fd_handler(vs->csock, vnc_tls_handshake_io, NULL, vs);
|
75 |
else
|
76 |
qemu_set_fd_handler(vs->csock, NULL, vnc_tls_handshake_io, vs);
|
77 |
return 0; |
78 |
} |
79 |
VNC_DEBUG("Handshake failed %s\n", gnutls_strerror(ret));
|
80 |
vnc_client_error(vs); |
81 |
return -1; |
82 |
} |
83 |
|
84 |
if (vs->vd->tls.x509verify) {
|
85 |
if (vnc_tls_validate_certificate(vs) < 0) { |
86 |
VNC_DEBUG("Client verification failed\n");
|
87 |
vnc_client_error(vs); |
88 |
return -1; |
89 |
} else {
|
90 |
VNC_DEBUG("Client verification passed\n");
|
91 |
} |
92 |
} |
93 |
|
94 |
VNC_DEBUG("Handshake done, switching to TLS data mode\n");
|
95 |
vs->tls.wiremode = VNC_WIREMODE_TLS; |
96 |
qemu_set_fd_handler2(vs->csock, NULL, vnc_client_read, vnc_client_write, vs);
|
97 |
|
98 |
start_auth_vencrypt_subauth(vs); |
99 |
|
100 |
return 0; |
101 |
} |
102 |
|
103 |
static void vnc_tls_handshake_io(void *opaque) { |
104 |
struct VncState *vs = (struct VncState *)opaque; |
105 |
|
106 |
VNC_DEBUG("Handshake IO continue\n");
|
107 |
vnc_start_vencrypt_handshake(vs); |
108 |
} |
109 |
|
110 |
|
111 |
|
112 |
#define NEED_X509_AUTH(vs) \
|
113 |
((vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509NONE || \ |
114 |
(vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509VNC || \ |
115 |
(vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509PLAIN || \ |
116 |
(vs)->vd->subauth == VNC_AUTH_VENCRYPT_X509SASL) |
117 |
|
118 |
|
119 |
static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len) |
120 |
{ |
121 |
int auth = read_u32(data, 0); |
122 |
|
123 |
if (auth != vs->vd->subauth) {
|
124 |
VNC_DEBUG("Rejecting auth %d\n", auth);
|
125 |
vnc_write_u8(vs, 0); /* Reject auth */ |
126 |
vnc_flush(vs); |
127 |
vnc_client_error(vs); |
128 |
} else {
|
129 |
VNC_DEBUG("Accepting auth %d, setting up TLS for handshake\n", auth);
|
130 |
vnc_write_u8(vs, 1); /* Accept auth */ |
131 |
vnc_flush(vs); |
132 |
|
133 |
if (vnc_tls_client_setup(vs, NEED_X509_AUTH(vs)) < 0) { |
134 |
VNC_DEBUG("Failed to setup TLS\n");
|
135 |
return 0; |
136 |
} |
137 |
|
138 |
VNC_DEBUG("Start TLS VeNCrypt handshake process\n");
|
139 |
if (vnc_start_vencrypt_handshake(vs) < 0) { |
140 |
VNC_DEBUG("Failed to start TLS handshake\n");
|
141 |
return 0; |
142 |
} |
143 |
} |
144 |
return 0; |
145 |
} |
146 |
|
147 |
static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len) |
148 |
{ |
149 |
if (data[0] != 0 || |
150 |
data[1] != 2) { |
151 |
VNC_DEBUG("Unsupported VeNCrypt protocol %d.%d\n", (int)data[0], (int)data[1]); |
152 |
vnc_write_u8(vs, 1); /* Reject version */ |
153 |
vnc_flush(vs); |
154 |
vnc_client_error(vs); |
155 |
} else {
|
156 |
VNC_DEBUG("Sending allowed auth %d\n", vs->vd->subauth);
|
157 |
vnc_write_u8(vs, 0); /* Accept version */ |
158 |
vnc_write_u8(vs, 1); /* Number of sub-auths */ |
159 |
vnc_write_u32(vs, vs->vd->subauth); /* The supported auth */
|
160 |
vnc_flush(vs); |
161 |
vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
|
162 |
} |
163 |
return 0; |
164 |
} |
165 |
|
166 |
|
167 |
void start_auth_vencrypt(VncState *vs)
|
168 |
{ |
169 |
/* Send VeNCrypt version 0.2 */
|
170 |
vnc_write_u8(vs, 0);
|
171 |
vnc_write_u8(vs, 2);
|
172 |
|
173 |
vnc_read_when(vs, protocol_client_vencrypt_init, 2);
|
174 |
} |
175 |
|