1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
|
/*
* Copyright (C) 2012 Michael Brown <mbrown@fensystems.co.uk>.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
FILE_LICENCE ( GPL2_OR_LATER );
/** @file
*
* Encrypted syslog protocol
*
*/
#include <stdint.h>
#include <stdlib.h>
#include <byteswap.h>
#include <ipxe/xfer.h>
#include <ipxe/open.h>
#include <ipxe/tcpip.h>
#include <ipxe/dhcp.h>
#include <ipxe/settings.h>
#include <ipxe/console.h>
#include <ipxe/lineconsole.h>
#include <ipxe/tls.h>
#include <ipxe/syslog.h>
#include <config/console.h>
/* Set default console usage if applicable */
#if ! ( defined ( CONSOLE_SYSLOGS ) && CONSOLE_EXPLICIT ( CONSOLE_SYSLOGS ) )
#undef CONSOLE_SYSLOGS
#define CONSOLE_SYSLOGS ( CONSOLE_USAGE_ALL & ~CONSOLE_USAGE_TUI )
#endif
struct console_driver syslogs_console __console_driver;
/** The encrypted syslog server */
static struct sockaddr_tcpip logserver = {
.st_port = htons ( SYSLOG_PORT ),
};
/**
* Handle encrypted syslog TLS interface close
*
* @v intf Interface
* @v rc Reason for close
*/
static void syslogs_close ( struct interface *intf __unused, int rc ) {
DBG ( "SYSLOGS console disconnected: %s\n", strerror ( rc ) );
}
/**
* Handle encrypted syslog TLS interface window change
*
* @v intf Interface
*/
static void syslogs_window_changed ( struct interface *intf ) {
/* Mark console as enabled when window first opens, indicating
* that TLS negotiation is complete. (Do not disable console
* when window closes again, since TCP will close the window
* whenever there is unACKed data.)
*/
if ( xfer_window ( intf ) ) {
if ( syslogs_console.disabled )
DBG ( "SYSLOGS console connected\n" );
syslogs_console.disabled = 0;
}
}
/** Encrypted syslog TLS interface operations */
static struct interface_operation syslogs_operations[] = {
INTF_OP ( xfer_window_changed, struct interface *,
syslogs_window_changed ),
INTF_OP ( intf_close, struct interface *, syslogs_close ),
};
/** Encrypted syslog TLS interface descriptor */
static struct interface_descriptor syslogs_desc =
INTF_DESC_PURE ( syslogs_operations );
/** The encrypted syslog TLS interface */
static struct interface syslogs = INTF_INIT ( syslogs_desc );
/******************************************************************************
*
* Console driver
*
******************************************************************************
*/
/** Encrypted syslog line buffer */
static char syslogs_buffer[SYSLOG_BUFSIZE];
/** Encrypted syslog severity */
static unsigned int syslogs_severity = SYSLOG_DEFAULT_SEVERITY;
/**
* Handle ANSI set encrypted syslog priority (private sequence)
*
* @v ctx ANSI escape sequence context
* @v count Parameter count
* @v params List of graphic rendition aspects
*/
static void syslogs_handle_priority ( struct ansiesc_context *ctx __unused,
unsigned int count __unused,
int params[] ) {
if ( params[0] >= 0 ) {
syslogs_severity = params[0];
} else {
syslogs_severity = SYSLOG_DEFAULT_SEVERITY;
}
}
/** Encrypted syslog ANSI escape sequence handlers */
static struct ansiesc_handler syslogs_handlers[] = {
{ ANSIESC_LOG_PRIORITY, syslogs_handle_priority },
{ 0, NULL }
};
/** Encrypted syslog line console */
static struct line_console syslogs_line = {
.buffer = syslogs_buffer,
.len = sizeof ( syslogs_buffer ),
.ctx = {
.handlers = syslogs_handlers,
},
};
/** Encrypted syslog recursion marker */
static int syslogs_entered;
/**
* Print a character to encrypted syslog console
*
* @v character Character to be printed
*/
static void syslogs_putchar ( int character ) {
int rc;
/* Ignore if we are already mid-logging */
if ( syslogs_entered )
return;
/* Fill line buffer */
if ( line_putchar ( &syslogs_line, character ) == 0 )
return;
/* Guard against re-entry */
syslogs_entered = 1;
/* Send log message */
if ( ( rc = syslog_send ( &syslogs, syslogs_severity,
syslogs_buffer, "\n" ) ) != 0 ) {
DBG ( "SYSLOGS could not send log message: %s\n",
strerror ( rc ) );
}
/* Clear re-entry flag */
syslogs_entered = 0;
}
/** Encrypted syslog console driver */
struct console_driver syslogs_console __console_driver = {
.putchar = syslogs_putchar,
.disabled = CONSOLE_DISABLED,
.usage = CONSOLE_SYSLOGS,
};
/******************************************************************************
*
* Settings
*
******************************************************************************
*/
/** Encrypted syslog server setting */
const struct setting syslogs_setting __setting ( SETTING_MISC, syslogs ) = {
.name = "syslogs",
.description = "Encrypted syslog server",
.tag = DHCP_EB_SYSLOGS_SERVER,
.type = &setting_type_string,
};
/**
* Apply encrypted syslog settings
*
* @ret rc Return status code
*/
static int apply_syslogs_settings ( void ) {
static char *old_server;
char *server;
struct interface *socket;
int rc;
/* Fetch log server */
fetch_string_setting_copy ( NULL, &syslogs_setting, &server );
/* Do nothing unless log server has changed */
if ( ( ( server == NULL ) && ( old_server == NULL ) ) ||
( ( server != NULL ) && ( old_server != NULL ) &&
( strcmp ( server, old_server ) == 0 ) ) ) {
rc = 0;
goto out_no_change;
}
free ( old_server );
old_server = NULL;
/* Reset encrypted syslog connection */
syslogs_console.disabled = CONSOLE_DISABLED;
intf_restart ( &syslogs, 0 );
/* Do nothing unless we have a log server */
if ( ! server ) {
DBG ( "SYSLOGS has no log server\n" );
rc = 0;
goto out_no_server;
}
/* Add TLS filter */
if ( ( rc = add_tls ( &syslogs, server, &socket ) ) != 0 ) {
DBG ( "SYSLOGS cannot create TLS filter: %s\n",
strerror ( rc ) );
goto err_add_tls;
}
/* Connect to log server */
if ( ( rc = xfer_open_named_socket ( socket, SOCK_STREAM,
(( struct sockaddr *) &logserver ),
server, NULL ) ) != 0 ) {
DBG ( "SYSLOGS cannot connect to log server: %s\n",
strerror ( rc ) );
goto err_open_named_socket;
}
DBG ( "SYSLOGS using log server %s\n", server );
/* Record log server */
old_server = server;
server = NULL;
/* Success */
rc = 0;
err_open_named_socket:
err_add_tls:
out_no_server:
out_no_change:
free ( server );
return rc;
}
/** Encrypted syslog settings applicator */
struct settings_applicator syslogs_applicator __settings_applicator = {
.apply = apply_syslogs_settings,
};
|
