Merge remote-tracking branch 'remotes/cohuck-gitlab/tags/s390x-20210305' into staging
[qemu.git] / ui / vnc-auth-vencrypt.c
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 "qemu/osdep.h"
28 #include "vnc.h"
29 #include "qapi/error.h"
30 #include "qemu/main-loop.h"
31 #include "trace.h"
32
33 static void start_auth_vencrypt_subauth(VncState *vs)
34 {
35 switch (vs->subauth) {
36 case VNC_AUTH_VENCRYPT_TLSNONE:
37 case VNC_AUTH_VENCRYPT_X509NONE:
38 vnc_write_u32(vs, 0); /* Accept auth completion */
39 start_client_init(vs);
40 break;
41
42 case VNC_AUTH_VENCRYPT_TLSVNC:
43 case VNC_AUTH_VENCRYPT_X509VNC:
44 start_auth_vnc(vs);
45 break;
46
47 #ifdef CONFIG_VNC_SASL
48 case VNC_AUTH_VENCRYPT_TLSSASL:
49 case VNC_AUTH_VENCRYPT_X509SASL:
50 start_auth_sasl(vs);
51 break;
52 #endif /* CONFIG_VNC_SASL */
53
54 default: /* Should not be possible, but just in case */
55 trace_vnc_auth_fail(vs, vs->auth, "Unhandled VeNCrypt subauth", "");
56 vnc_write_u8(vs, 1);
57 if (vs->minor >= 8) {
58 static const char err[] = "Unsupported authentication type";
59 vnc_write_u32(vs, sizeof(err));
60 vnc_write(vs, err, sizeof(err));
61 }
62 vnc_client_error(vs);
63 }
64 }
65
66 static void vnc_tls_handshake_done(QIOTask *task,
67 gpointer user_data)
68 {
69 VncState *vs = user_data;
70 Error *err = NULL;
71
72 if (qio_task_propagate_error(task, &err)) {
73 trace_vnc_auth_fail(vs, vs->auth, "TLS handshake failed",
74 error_get_pretty(err));
75 vnc_client_error(vs);
76 error_free(err);
77 } else {
78 if (vs->ioc_tag) {
79 g_source_remove(vs->ioc_tag);
80 }
81 vs->ioc_tag = qio_channel_add_watch(
82 vs->ioc, G_IO_IN | G_IO_HUP | G_IO_ERR | G_IO_OUT,
83 vnc_client_io, vs, NULL);
84 start_auth_vencrypt_subauth(vs);
85 }
86 }
87
88
89 static int protocol_client_vencrypt_auth(VncState *vs, uint8_t *data, size_t len)
90 {
91 int auth = read_u32(data, 0);
92
93 trace_vnc_auth_vencrypt_subauth(vs, auth);
94 if (auth != vs->subauth) {
95 trace_vnc_auth_fail(vs, vs->auth, "Unsupported sub-auth version", "");
96 vnc_write_u8(vs, 0); /* Reject auth */
97 vnc_flush(vs);
98 vnc_client_error(vs);
99 } else {
100 Error *err = NULL;
101 QIOChannelTLS *tls;
102 vnc_write_u8(vs, 1); /* Accept auth */
103 vnc_flush(vs);
104
105 if (vs->ioc_tag) {
106 g_source_remove(vs->ioc_tag);
107 vs->ioc_tag = 0;
108 }
109
110 tls = qio_channel_tls_new_server(
111 vs->ioc,
112 vs->vd->tlscreds,
113 vs->vd->tlsauthzid,
114 &err);
115 if (!tls) {
116 trace_vnc_auth_fail(vs, vs->auth, "TLS setup failed",
117 error_get_pretty(err));
118 error_free(err);
119 vnc_client_error(vs);
120 return 0;
121 }
122
123 qio_channel_set_name(QIO_CHANNEL(tls), "vnc-server-tls");
124 object_unref(OBJECT(vs->ioc));
125 vs->ioc = QIO_CHANNEL(tls);
126 trace_vnc_client_io_wrap(vs, vs->ioc, "tls");
127 vs->tls = qio_channel_tls_get_session(tls);
128
129 qio_channel_tls_handshake(tls,
130 vnc_tls_handshake_done,
131 vs,
132 NULL,
133 NULL);
134 }
135 return 0;
136 }
137
138 static int protocol_client_vencrypt_init(VncState *vs, uint8_t *data, size_t len)
139 {
140 trace_vnc_auth_vencrypt_version(vs, (int)data[0], (int)data[1]);
141 if (data[0] != 0 ||
142 data[1] != 2) {
143 trace_vnc_auth_fail(vs, vs->auth, "Unsupported version", "");
144 vnc_write_u8(vs, 1); /* Reject version */
145 vnc_flush(vs);
146 vnc_client_error(vs);
147 } else {
148 vnc_write_u8(vs, 0); /* Accept version */
149 vnc_write_u8(vs, 1); /* Number of sub-auths */
150 vnc_write_u32(vs, vs->subauth); /* The supported auth */
151 vnc_flush(vs);
152 vnc_read_when(vs, protocol_client_vencrypt_auth, 4);
153 }
154 return 0;
155 }
156
157
158 void start_auth_vencrypt(VncState *vs)
159 {
160 /* Send VeNCrypt version 0.2 */
161 vnc_write_u8(vs, 0);
162 vnc_write_u8(vs, 2);
163
164 vnc_read_when(vs, protocol_client_vencrypt_init, 2);
165 }
166