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237.2.1
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2008-12-10 01:26:02 UTC
- mfrom: (237.1.2 mandos)
- mto: (24.1.114 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 238.
- Revision ID: teddy@fukt.bsnet.se-20081210012602-vhz3h75xkj24t340
First version of a somewhat complete D-Bus server interface. Also
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
change user/group name to "_mandos".
* debian/mandos.postinst: Rename old "mandos" user and group to
"_mandos"; create "_mandos" user and group
if none exist.
* debian/mandos-client.postinst: - '' -
* initramfs-tools-hook: Try "_mandos" before "mandos" as user and
group name.
* mandos (_datetime_to_dbus_struct): New; was previously local.
(Client.started): Renamed to "last_started". All users changed.
(Client.started): New; boolean.
(Client.dbus_object_path): New.
(Client.check_command): Renamed to "checker_command". All users
changed.
(Client.__init__): Set and use "self.dbus_object_path". Set
"self.started".
(Client.start): Update "self.started". Emit "self.PropertyChanged"
signals for both "started" and "last_started".
(Client.stop): Update "self.started". Emit "self.PropertyChanged"
signal for "started".
(Client.checker_callback): Take additional "command" argument. All
callers changed. Emit
"self.PropertyChanged" signal.
(Client.bump_timeout): Emit "self.PropertyChanged" signal for
"last_checked_ok".
(Client.start_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.stop_checker): Emit "self.PropertyChanged" signal for
"checker_running".
(Client.still_valid): Bug fix: use "getattr(self, started, False)"
instead of "self.started" in case this client
object is so new that the "started" attribute
has not been created yet.
(Client.IntervalChanged, Client.CheckerIsRunning, Client.GetChecker,
Client.GetCreated, Client.GetFingerprint, Client.GetHost,
Client.GetInterval, Client.GetName, Client.GetStarted,
Client.GetTimeout, Client.StateChanged, Client.TimeoutChanged):
Removed; all callers changed.
(Client.CheckerCompleted): Add "condition" and "command" arguments.
All callers changed.
(Client.GetAllProperties, Client.PropertyChanged): New.
(Client.StillValid): Renamed to "IsStillValid".
(Client.StartChecker): Changed to its own function to avoid the
return value from "Client.start_checker()".
(Client.Stop): Changed to its own function to avoid the return value
from "Client.stop()".
(main): Try "_mandos" before "mandos" as user and group name.
Removed inner function "remove_from_clients". New inner
class "MandosServer".
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- network-hooks.d
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2012 Teddy Hogeborn
13
* Copyright © 2008-2012 Björn Påhlsson
12
* Copyright © 2008 Teddy Hogeborn
13
* Copyright © 2008 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
28
28
*
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
54
struct in6_addr, inet_pton(),
55
connect() */
59
56
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
64
59
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
68
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
63
SIOCSIFFLAGS, if_indextoname(),
70
64
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
#include <netinet/in.h>
74
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
67
getuid(), getgid(), setuid(),
68
setgid() */
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
79
71
#include <argp.h> /* struct argp_option, error_t, struct
80
72
argp_state, struct argp,
81
73
argp_parse(), ARGP_KEY_ARG,
82
74
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
#include <grp.h> /* setgroups() */
91
92
#ifdef __linux__
93
#include <sys/klog.h> /* klogctl() */
94
#endif /* __linux__ */
95
75
96
76
/* Avahi */
97
77
/* All Avahi types, constants and functions
110
90
gnutls_*
111
91
init_gnutls_session(),
112
92
GNUTLS_* */
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
94
GNUTLS_OPENPGP_FMT_BASE64 */
116
95
117
96
/* GPGME */
118
97
#include <gpgme.h> /* All GPGME types, constants and
126
105
#define PATHDIR "/conf/conf.d/mandos"
127
106
#define SECKEY "seckey.txt"
128
107
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
108
131
109
bool debug = false;
132
110
static const char mandos_protocol_version[] = "1";
133
111
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
138
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
141
const char *ip;
142
uint16_t port;
143
AvahiIfIndex if_index;
144
int af;
145
struct timespec last_seen;
146
struct server *next;
147
struct server *prev;
148
} server;
112
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
113
150
114
/* Used for passing in values through the Avahi callback functions */
151
115
typedef struct {
156
120
gnutls_dh_params_t dh_params;
157
121
const char *priority;
158
122
gpgme_ctx_t ctx;
159
server *current_server;
160
123
} mandos_context;
161
124
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
167
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
170
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
int e = errno;
174
fprintf(stderr, "Mandos plugin %s: ",
175
program_invocation_short_name);
176
errno = e;
177
perror(print_text);
178
}
179
180
__attribute__((format (gnu_printf, 2, 3)))
181
int fprintf_plus(FILE *stream, const char *format, ...){
182
va_list ap;
183
va_start (ap, format);
184
185
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
186
program_invocation_short_name));
187
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
}
189
190
125
/*
191
* Make additional room in "buffer" for at least BUFFER_SIZE more
192
* bytes. "buffer_capacity" is how much is currently allocated,
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
193
128
* "buffer_length" is how much is already used.
194
129
*/
195
size_t incbuffer(char **buffer, size_t buffer_length,
196
size_t buffer_capacity){
197
if(buffer_length + BUFFER_SIZE > buffer_capacity){
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
131
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
198
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
if(buffer == NULL){
134
if (buffer == NULL){
200
135
return 0;
201
136
}
202
137
buffer_capacity += BUFFER_SIZE;
204
139
return buffer_capacity;
205
140
}
206
141
207
/* Add server to set of servers to retry periodically */
208
bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
209
int af){
210
int ret;
211
server *new_server = malloc(sizeof(server));
212
if(new_server == NULL){
213
perror_plus("malloc");
214
return false;
215
}
216
*new_server = (server){ .ip = strdup(ip),
217
.port = port,
218
.if_index = if_index,
219
.af = af };
220
if(new_server->ip == NULL){
221
perror_plus("strdup");
222
return false;
223
}
224
/* Special case of first server */
225
if (mc.current_server == NULL){
226
new_server->next = new_server;
227
new_server->prev = new_server;
228
mc.current_server = new_server;
229
/* Place the new server last in the list */
230
} else {
231
new_server->next = mc.current_server;
232
new_server->prev = mc.current_server->prev;
233
new_server->prev->next = new_server;
234
mc.current_server->prev = new_server;
235
}
236
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
237
if(ret == -1){
238
perror_plus("clock_gettime");
239
return false;
240
}
241
return true;
242
}
243
244
142
/*
245
143
* Initialize GPGME.
246
144
*/
247
static bool init_gpgme(const char *seckey, const char *pubkey,
248
const char *tempdir){
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
147
int ret;
249
148
gpgme_error_t rc;
250
149
gpgme_engine_info_t engine_info;
251
150
252
151
253
152
/*
254
* Helper function to insert pub and seckey to the engine keyring.
153
* Helper function to insert pub and seckey to the enigne keyring.
255
154
*/
256
155
bool import_key(const char *filename){
257
int ret;
258
156
int fd;
259
157
gpgme_data_t pgp_data;
260
158
261
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
262
160
if(fd == -1){
263
perror_plus("open");
161
perror("open");
264
162
return false;
265
163
}
266
164
267
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
268
if(rc != GPG_ERR_NO_ERROR){
269
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
270
gpgme_strsource(rc), gpgme_strerror(rc));
271
return false;
272
}
273
274
rc = gpgme_op_import(mc.ctx, pgp_data);
275
if(rc != GPG_ERR_NO_ERROR){
276
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
278
return false;
279
}
280
281
ret = (int)TEMP_FAILURE_RETRY(close(fd));
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
169
return false;
170
}
171
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
176
return false;
177
}
178
179
ret = TEMP_FAILURE_RETRY(close(fd));
282
180
if(ret == -1){
283
perror_plus("close");
181
perror("close");
284
182
}
285
183
gpgme_data_release(pgp_data);
286
184
return true;
287
185
}
288
186
289
if(debug){
290
fprintf_plus(stderr, "Initializing GPGME\n");
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
291
189
}
292
190
293
191
/* Init GPGME */
294
192
gpgme_check_version(NULL);
295
193
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
296
if(rc != GPG_ERR_NO_ERROR){
297
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
298
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
299
197
return false;
300
198
}
301
199
302
/* Set GPGME home directory for the OpenPGP engine only */
303
rc = gpgme_get_engine_info(&engine_info);
304
if(rc != GPG_ERR_NO_ERROR){
305
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
306
gpgme_strsource(rc), gpgme_strerror(rc));
200
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
307
205
return false;
308
206
}
309
207
while(engine_info != NULL){
315
213
engine_info = engine_info->next;
316
214
}
317
215
if(engine_info == NULL){
318
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
tempdir);
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
320
217
return false;
321
218
}
322
219
323
220
/* Create new GPGME "context" */
324
rc = gpgme_new(&(mc.ctx));
325
if(rc != GPG_ERR_NO_ERROR){
326
fprintf_plus(stderr, "Mandos plugin mandos-client: "
327
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
gpgme_strerror(rc));
329
return false;
330
}
331
332
if(not import_key(pubkey) or not import_key(seckey)){
333
return false;
334
}
335
336
return true;
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
226
}
227
228
if (not import_key(pubkey) or not import_key(seckey)){
229
return false;
230
}
231
232
return true;
337
233
}
338
234
339
235
/*
340
236
* Decrypt OpenPGP data.
341
237
* Returns -1 on error
342
238
*/
343
static ssize_t pgp_packet_decrypt(const char *cryptotext,
344
size_t crypto_size,
345
char **plaintext){
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
346
243
gpgme_data_t dh_crypto, dh_plain;
347
244
gpgme_error_t rc;
348
245
ssize_t ret;
349
246
size_t plaintext_capacity = 0;
350
247
ssize_t plaintext_length = 0;
351
248
352
if(debug){
353
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
249
if (debug){
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
354
251
}
355
252
356
253
/* Create new GPGME data buffer from memory cryptotext */
357
254
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
358
255
0);
359
if(rc != GPG_ERR_NO_ERROR){
360
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
361
gpgme_strsource(rc), gpgme_strerror(rc));
256
if (rc != GPG_ERR_NO_ERROR){
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
gpgme_strsource(rc), gpgme_strerror(rc));
362
259
return -1;
363
260
}
364
261
365
262
/* Create new empty GPGME data buffer for the plaintext */
366
263
rc = gpgme_data_new(&dh_plain);
367
if(rc != GPG_ERR_NO_ERROR){
368
fprintf_plus(stderr, "Mandos plugin mandos-client: "
369
"bad gpgme_data_new: %s: %s\n",
370
gpgme_strsource(rc), gpgme_strerror(rc));
264
if (rc != GPG_ERR_NO_ERROR){
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
371
267
gpgme_data_release(dh_crypto);
372
268
return -1;
373
269
}
374
270
375
271
/* Decrypt data from the cryptotext data buffer to the plaintext
376
272
data buffer */
377
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
gpgme_strsource(rc), gpgme_strerror(rc));
381
277
plaintext_length = -1;
382
if(debug){
278
if (debug){
383
279
gpgme_decrypt_result_t result;
384
result = gpgme_op_decrypt_result(mc.ctx);
385
if(result == NULL){
386
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
387
283
} else {
388
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
389
result->unsupported_algorithm);
390
fprintf_plus(stderr, "Wrong key usage: %u\n",
391
result->wrong_key_usage);
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
392
288
if(result->file_name != NULL){
393
fprintf_plus(stderr, "File name: %s\n", result->file_name);
289
fprintf(stderr, "File name: %s\n", result->file_name);
394
290
}
395
291
gpgme_recipient_t recipient;
396
292
recipient = result->recipients;
397
while(recipient != NULL){
398
fprintf_plus(stderr, "Public key algorithm: %s\n",
399
gpgme_pubkey_algo_name
400
(recipient->pubkey_algo));
401
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
402
fprintf_plus(stderr, "Secret key available: %s\n",
403
recipient->status == GPG_ERR_NO_SECKEY
404
? "No" : "Yes");
405
recipient = recipient->next;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
406
303
}
407
304
}
408
305
}
410
307
}
411
308
412
309
if(debug){
413
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
310
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
414
311
}
415
312
416
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
417
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
418
perror_plus("gpgme_data_seek");
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
419
316
plaintext_length = -1;
420
317
goto decrypt_end;
421
318
}
422
319
423
320
*plaintext = NULL;
424
321
while(true){
425
plaintext_capacity = incbuffer(plaintext,
426
(size_t)plaintext_length,
427
plaintext_capacity);
428
if(plaintext_capacity == 0){
429
perror_plus("incbuffer");
430
plaintext_length = -1;
431
goto decrypt_end;
322
plaintext_capacity = adjustbuffer(plaintext,
323
(size_t)plaintext_length,
324
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
327
plaintext_length = -1;
328
goto decrypt_end;
432
329
}
433
330
434
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
435
332
BUFFER_SIZE);
436
333
/* Print the data, if any */
437
if(ret == 0){
334
if (ret == 0){
438
335
/* EOF */
439
336
break;
440
337
}
441
338
if(ret < 0){
442
perror_plus("gpgme_data_read");
339
perror("gpgme_data_read");
443
340
plaintext_length = -1;
444
341
goto decrypt_end;
445
342
}
447
344
}
448
345
449
346
if(debug){
450
fprintf_plus(stderr, "Decrypted password is: ");
347
fprintf(stderr, "Decrypted password is: ");
451
348
for(ssize_t i = 0; i < plaintext_length; i++){
452
349
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
453
350
}
464
361
return plaintext_length;
465
362
}
466
363
467
static const char * safer_gnutls_strerror(int value){
468
const char *ret = gnutls_strerror(value); /* Spurious warning from
469
-Wunreachable-code */
470
if(ret == NULL)
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
471
367
ret = "(unknown)";
472
368
return ret;
473
369
}
475
371
/* GnuTLS log function callback */
476
372
static void debuggnutls(__attribute__((unused)) int level,
477
373
const char* string){
478
fprintf_plus(stderr, "GnuTLS: %s", string);
374
fprintf(stderr, "GnuTLS: %s", string);
479
375
}
480
376
481
static int init_gnutls_global(const char *pubkeyfilename,
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
482
379
const char *seckeyfilename){
483
380
int ret;
484
381
485
382
if(debug){
486
fprintf_plus(stderr, "Initializing GnuTLS\n");
383
fprintf(stderr, "Initializing GnuTLS\n");
487
384
}
488
385
489
386
ret = gnutls_global_init();
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
492
safer_gnutls_strerror(ret));
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
493
390
return -1;
494
391
}
495
392
496
if(debug){
393
if (debug){
497
394
/* "Use a log level over 10 to enable all debugging options."
498
395
* - GnuTLS manual
499
396
*/
502
399
}
503
400
504
401
/* OpenPGP credentials */
505
ret = gnutls_certificate_allocate_credentials(&mc.cred);
506
if(ret != GNUTLS_E_SUCCESS){
507
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
508
safer_gnutls_strerror(ret));
509
gnutls_global_deinit();
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
510
408
return -1;
511
409
}
512
410
513
411
if(debug){
514
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
515
" secret key %s as GnuTLS credentials\n",
516
pubkeyfilename,
517
seckeyfilename);
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
414
seckeyfilename);
518
415
}
519
416
520
417
ret = gnutls_certificate_set_openpgp_key_file
521
(mc.cred, pubkeyfilename, seckeyfilename,
418
(mc->cred, pubkeyfilename, seckeyfilename,
522
419
GNUTLS_OPENPGP_FMT_BASE64);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr,
525
"Error[%d] while reading the OpenPGP key pair ('%s',"
526
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
527
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
528
safer_gnutls_strerror(ret));
420
if (ret != GNUTLS_E_SUCCESS) {
421
fprintf(stderr,
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
425
safer_gnutls_strerror(ret));
529
426
goto globalfail;
530
427
}
531
428
532
429
/* GnuTLS server initialization */
533
ret = gnutls_dh_params_init(&mc.dh_params);
534
if(ret != GNUTLS_E_SUCCESS){
535
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
536
" initialization: %s\n",
537
safer_gnutls_strerror(ret));
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
538
434
goto globalfail;
539
435
}
540
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
541
if(ret != GNUTLS_E_SUCCESS){
542
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
543
safer_gnutls_strerror(ret));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
544
440
goto globalfail;
545
441
}
546
442
547
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
548
444
549
445
return 0;
550
446
551
447
globalfail:
552
448
553
gnutls_certificate_free_credentials(mc.cred);
449
gnutls_certificate_free_credentials(mc->cred);
554
450
gnutls_global_deinit();
555
gnutls_dh_params_deinit(mc.dh_params);
451
gnutls_dh_params_deinit(mc->dh_params);
556
452
return -1;
557
453
}
558
454
559
static int init_gnutls_session(gnutls_session_t *session){
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
560
457
int ret;
561
458
/* GnuTLS session creation */
562
do {
563
ret = gnutls_init(session, GNUTLS_SERVER);
564
if(quit_now){
565
return -1;
566
}
567
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
568
if(ret != GNUTLS_E_SUCCESS){
569
fprintf_plus(stderr,
570
"Error in GnuTLS session initialization: %s\n",
571
safer_gnutls_strerror(ret));
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
safer_gnutls_strerror(ret));
572
463
}
573
464
574
465
{
575
466
const char *err;
576
do {
577
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
578
if(quit_now){
579
gnutls_deinit(*session);
580
return -1;
581
}
582
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
583
if(ret != GNUTLS_E_SUCCESS){
584
fprintf_plus(stderr, "Syntax error at: %s\n", err);
585
fprintf_plus(stderr, "GnuTLS error: %s\n",
586
safer_gnutls_strerror(ret));
587
gnutls_deinit(*session);
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
469
fprintf(stderr, "Syntax error at: %s\n", err);
470
fprintf(stderr, "GnuTLS error: %s\n",
471
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
588
473
return -1;
589
474
}
590
475
}
591
476
592
do {
593
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
594
mc.cred);
595
if(quit_now){
596
gnutls_deinit(*session);
597
return -1;
598
}
599
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
600
if(ret != GNUTLS_E_SUCCESS){
601
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
602
safer_gnutls_strerror(ret));
603
gnutls_deinit(*session);
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
604
483
return -1;
605
484
}
606
485
607
486
/* ignore client certificate if any. */
608
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
609
489
610
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
611
491
612
492
return 0;
613
493
}
619
499
/* Called when a Mandos server is found */
620
500
static int start_mandos_communication(const char *ip, uint16_t port,
621
501
AvahiIfIndex if_index,
622
int af){
623
int ret, tcp_sd = -1;
624
ssize_t sret;
625
union {
626
struct sockaddr_in in;
627
struct sockaddr_in6 in6;
628
} to;
502
mandos_context *mc){
503
int ret, tcp_sd;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
629
505
char *buffer = NULL;
630
char *decrypted_buffer = NULL;
506
char *decrypted_buffer;
631
507
size_t buffer_length = 0;
632
508
size_t buffer_capacity = 0;
509
ssize_t decrypted_buffer_size;
633
510
size_t written;
634
int retval = -1;
511
int retval = 0;
512
char interface[IF_NAMESIZE];
635
513
gnutls_session_t session;
636
int pf; /* Protocol family */
637
638
errno = 0;
639
640
if(quit_now){
641
errno = EINTR;
642
return -1;
643
}
644
645
switch(af){
646
case AF_INET6:
647
pf = PF_INET6;
648
break;
649
case AF_INET:
650
pf = PF_INET;
651
break;
652
default:
653
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
errno = EINVAL;
655
return -1;
656
}
657
658
ret = init_gnutls_session(&session);
659
if(ret != 0){
660
return -1;
661
}
662
663
if(debug){
664
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
665
PRIu16 "\n", ip, port);
666
}
667
668
tcp_sd = socket(pf, SOCK_STREAM, 0);
669
if(tcp_sd < 0){
670
int e = errno;
671
perror_plus("socket");
672
errno = e;
673
goto mandos_end;
674
}
675
676
if(quit_now){
677
errno = EINTR;
678
goto mandos_end;
514
515
ret = init_gnutls_session (mc, &session);
516
if (ret != 0){
517
return -1;
518
}
519
520
if(debug){
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
522
"\n", ip, port);
523
}
524
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
if(tcp_sd < 0) {
527
perror("socket");
528
return -1;
529
}
530
531
if(debug){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
533
perror("if_indextoname");
534
return -1;
535
}
536
fprintf(stderr, "Binding to interface %s\n", interface);
679
537
}
680
538
681
539
memset(&to, 0, sizeof(to));
682
if(af == AF_INET6){
683
to.in6.sin6_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in6.sin6_addr);
685
} else { /* IPv4 */
686
to.in.sin_family = (sa_family_t)af;
687
ret = inet_pton(af, ip, &to.in.sin_addr);
688
}
689
if(ret < 0 ){
690
int e = errno;
691
perror_plus("inet_pton");
692
errno = e;
693
goto mandos_end;
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
544
if (ret < 0 ){
545
perror("inet_pton");
546
return -1;
694
547
}
695
548
if(ret == 0){
696
int e = errno;
697
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
errno = e;
699
goto mandos_end;
700
}
701
if(af == AF_INET6){
702
to.in6.sin6_port = htons(port); /* Spurious warnings from
703
-Wconversion and
704
-Wunreachable-code */
705
706
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
707
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
708
-Wunreachable-code*/
709
if(if_index == AVAHI_IF_UNSPEC){
710
fprintf_plus(stderr, "An IPv6 link-local address is"
711
" incomplete without a network interface\n");
712
errno = EINVAL;
713
goto mandos_end;
714
}
715
/* Set the network interface number as scope */
716
to.in6.sin6_scope_id = (uint32_t)if_index;
717
}
718
} else {
719
to.in.sin_port = htons(port); /* Spurious warnings from
720
-Wconversion and
721
-Wunreachable-code */
722
}
549
fprintf(stderr, "Bad address: %s\n", ip);
550
return -1;
551
}
552
to.in6.sin6_port = htons(port); /* Spurious warning */
723
553
724
if(quit_now){
725
errno = EINTR;
726
goto mandos_end;
727
}
554
to.in6.sin6_scope_id = (uint32_t)if_index;
728
555
729
556
if(debug){
730
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
731
char interface[IF_NAMESIZE];
732
if(if_indextoname((unsigned int)if_index, interface) == NULL){
733
perror_plus("if_indextoname");
734
} else {
735
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
736
"\n", ip, interface, port);
737
}
738
} else {
739
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
740
ip, port);
741
}
742
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
743
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
744
const char *pcret;
745
if(af == AF_INET6){
746
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
747
sizeof(addrstr));
748
} else {
749
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
sizeof(addrstr));
751
}
752
if(pcret == NULL){
753
perror_plus("inet_ntop");
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
562
perror("inet_ntop");
754
563
} else {
755
564
if(strcmp(addrstr, ip) != 0){
756
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
565
fprintf(stderr, "Canonical address form: %s\n", addrstr);
757
566
}
758
567
}
759
568
}
760
569
761
if(quit_now){
762
errno = EINTR;
763
goto mandos_end;
764
}
765
766
if(af == AF_INET6){
767
ret = connect(tcp_sd, &to.in6, sizeof(to));
768
} else {
769
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
770
}
771
if(ret < 0){
772
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
773
int e = errno;
774
perror_plus("connect");
775
errno = e;
776
}
777
goto mandos_end;
778
}
779
780
if(quit_now){
781
errno = EINTR;
782
goto mandos_end;
570
ret = connect(tcp_sd, &to.in, sizeof(to));
571
if (ret < 0){
572
perror("connect");
573
return -1;
783
574
}
784
575
785
576
const char *out = mandos_protocol_version;
786
577
written = 0;
787
while(true){
578
while (true){
788
579
size_t out_size = strlen(out);
789
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
790
out_size - written));
791
if(ret == -1){
792
int e = errno;
793
perror_plus("write");
794
errno = e;
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
out_size - written));
582
if (ret == -1){
583
perror("write");
584
retval = -1;
795
585
goto mandos_end;
796
586
}
797
587
written += (size_t)ret;
798
588
if(written < out_size){
799
589
continue;
800
590
} else {
801
if(out == mandos_protocol_version){
591
if (out == mandos_protocol_version){
802
592
written = 0;
803
593
out = "\r\n";
804
594
} else {
805
595
break;
806
596
}
807
597
}
808
809
if(quit_now){
810
errno = EINTR;
811
goto mandos_end;
812
}
813
598
}
814
599
815
600
if(debug){
816
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
817
}
818
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
823
824
/* Spurious warning from -Wint-to-pointer-cast */
825
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
826
827
if(quit_now){
828
errno = EINTR;
829
goto mandos_end;
830
}
831
832
do {
833
ret = gnutls_handshake(session);
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
602
}
603
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
605
606
do{
607
ret = gnutls_handshake (session);
838
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
839
609
840
if(ret != GNUTLS_E_SUCCESS){
610
if (ret != GNUTLS_E_SUCCESS){
841
611
if(debug){
842
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
843
gnutls_perror(ret);
612
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
613
gnutls_perror (ret);
844
614
}
845
errno = EPROTO;
615
retval = -1;
846
616
goto mandos_end;
847
617
}
848
618
849
619
/* Read OpenPGP packet that contains the wanted password */
850
620
851
621
if(debug){
852
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
853
" %s\n", ip);
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
623
ip);
854
624
}
855
625
856
626
while(true){
857
858
if(quit_now){
859
errno = EINTR;
860
goto mandos_end;
861
}
862
863
buffer_capacity = incbuffer(&buffer, buffer_length,
864
buffer_capacity);
865
if(buffer_capacity == 0){
866
int e = errno;
867
perror_plus("incbuffer");
868
errno = e;
869
goto mandos_end;
870
}
871
872
if(quit_now){
873
errno = EINTR;
874
goto mandos_end;
875
}
876
877
sret = gnutls_record_recv(session, buffer+buffer_length,
878
BUFFER_SIZE);
879
if(sret == 0){
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
628
buffer_capacity);
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
631
retval = -1;
632
goto mandos_end;
633
}
634
635
ret = gnutls_record_recv(session, buffer+buffer_length,
636
BUFFER_SIZE);
637
if (ret == 0){
880
638
break;
881
639
}
882
if(sret < 0){
883
switch(sret){
640
if (ret < 0){
641
switch(ret){
884
642
case GNUTLS_E_INTERRUPTED:
885
643
case GNUTLS_E_AGAIN:
886
644
break;
887
645
case GNUTLS_E_REHANDSHAKE:
888
do {
889
ret = gnutls_handshake(session);
890
891
if(quit_now){
892
errno = EINTR;
893
goto mandos_end;
894
}
646
do{
647
ret = gnutls_handshake (session);
895
648
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
896
if(ret < 0){
897
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
898
"***\n");
899
gnutls_perror(ret);
900
errno = EPROTO;
649
if (ret < 0){
650
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
651
gnutls_perror (ret);
652
retval = -1;
901
653
goto mandos_end;
902
654
}
903
655
break;
904
656
default:
905
fprintf_plus(stderr, "Unknown error while reading data from"
906
" encrypted session with Mandos server\n");
907
gnutls_bye(session, GNUTLS_SHUT_RDWR);
908
errno = EIO;
657
fprintf(stderr, "Unknown error while reading data from"
658
" encrypted session with Mandos server\n");
659
retval = -1;
660
gnutls_bye (session, GNUTLS_SHUT_RDWR);
909
661
goto mandos_end;
910
662
}
911
663
} else {
912
buffer_length += (size_t) sret;
664
buffer_length += (size_t) ret;
913
665
}
914
666
}
915
667
916
668
if(debug){
917
fprintf_plus(stderr, "Closing TLS session\n");
918
}
919
920
if(quit_now){
921
errno = EINTR;
922
goto mandos_end;
923
}
924
925
do {
926
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
927
if(quit_now){
928
errno = EINTR;
929
goto mandos_end;
930
}
931
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
932
933
if(buffer_length > 0){
934
ssize_t decrypted_buffer_size;
935
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
669
fprintf(stderr, "Closing TLS session\n");
670
}
671
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
673
674
if (buffer_length > 0){
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
676
buffer_length,
936
677
&decrypted_buffer);
937
if(decrypted_buffer_size >= 0){
938
678
if (decrypted_buffer_size >= 0){
939
679
written = 0;
940
680
while(written < (size_t) decrypted_buffer_size){
941
if(quit_now){
942
errno = EINTR;
943
goto mandos_end;
944
}
945
946
ret = (int)fwrite(decrypted_buffer + written, 1,
947
(size_t)decrypted_buffer_size - written,
948
stdout);
681
ret = (int)fwrite (decrypted_buffer + written, 1,
682
(size_t)decrypted_buffer_size - written,
683
stdout);
949
684
if(ret == 0 and ferror(stdout)){
950
int e = errno;
951
685
if(debug){
952
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
953
strerror(errno));
686
fprintf(stderr, "Error writing encrypted data: %s\n",
687
strerror(errno));
954
688
}
955
errno = e;
956
goto mandos_end;
689
retval = -1;
690
break;
957
691
}
958
692
written += (size_t)ret;
959
693
}
960
retval = 0;
694
free(decrypted_buffer);
695
} else {
696
retval = -1;
961
697
}
698
} else {
699
retval = -1;
962
700
}
963
701
964
702
/* Shutdown procedure */
965
703
966
704
mandos_end:
967
{
968
int e = errno;
969
free(decrypted_buffer);
970
free(buffer);
971
if(tcp_sd >= 0){
972
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
973
}
974
if(ret == -1){
975
if(e == 0){
976
e = errno;
977
}
978
perror_plus("close");
979
}
980
gnutls_deinit(session);
981
errno = e;
982
if(quit_now){
983
errno = EINTR;
984
retval = -1;
985
}
705
free(buffer);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
707
if(ret == -1){
708
perror("close");
986
709
}
710
gnutls_deinit (session);
987
711
return retval;
988
712
}
989
713
990
714
static void resolve_callback(AvahiSServiceResolver *r,
991
715
AvahiIfIndex interface,
992
AvahiProtocol proto,
716
AVAHI_GCC_UNUSED AvahiProtocol protocol,
993
717
AvahiResolverEvent event,
994
718
const char *name,
995
719
const char *type,
1000
724
AVAHI_GCC_UNUSED AvahiStringList *txt,
1001
725
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1002
726
flags,
1003
AVAHI_GCC_UNUSED void* userdata){
727
void* userdata) {
728
mandos_context *mc = userdata;
1004
729
assert(r);
1005
730
1006
731
/* Called whenever a service has been resolved successfully or
1007
732
timed out */
1008
733
1009
if(quit_now){
1010
return;
1011
}
1012
1013
switch(event){
734
switch (event) {
1014
735
default:
1015
736
case AVAHI_RESOLVER_FAILURE:
1016
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1017
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1018
domain,
1019
avahi_strerror(avahi_server_errno(mc.server)));
737
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
738
" of type '%s' in domain '%s': %s\n", name, type, domain,
739
avahi_strerror(avahi_server_errno(mc->server)));
1020
740
break;
1021
741
1022
742
case AVAHI_RESOLVER_FOUND:
1024
744
char ip[AVAHI_ADDRESS_STR_MAX];
1025
745
avahi_address_snprint(ip, sizeof(ip), address);
1026
746
if(debug){
1027
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1028
PRIdMAX ") on port %" PRIu16 "\n", name,
1029
host_name, ip, (intmax_t)interface, port);
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
1030
750
}
1031
int ret = start_mandos_communication(ip, port, interface,
1032
avahi_proto_to_af(proto));
1033
if(ret == 0){
1034
avahi_simple_poll_quit(mc.simple_poll);
1035
} else {
1036
if(not add_server(ip, port, interface,
1037
avahi_proto_to_af(proto))){
1038
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1039
" list\n", name);
1040
}
751
int ret = start_mandos_communication(ip, port, interface, mc);
752
if (ret == 0){
753
avahi_simple_poll_quit(mc->simple_poll);
1041
754
}
1042
755
}
1043
756
}
1044
757
avahi_s_service_resolver_free(r);
1045
758
}
1046
759
1047
static void browse_callback(AvahiSServiceBrowser *b,
1048
AvahiIfIndex interface,
1049
AvahiProtocol protocol,
1050
AvahiBrowserEvent event,
1051
const char *name,
1052
const char *type,
1053
const char *domain,
1054
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1055
flags,
1056
AVAHI_GCC_UNUSED void* userdata){
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
764
const char *name,
765
const char *type,
766
const char *domain,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
768
flags,
769
void* userdata) {
770
mandos_context *mc = userdata;
1057
771
assert(b);
1058
772
1059
773
/* Called whenever a new services becomes available on the LAN or
1060
774
is removed from the LAN */
1061
775
1062
if(quit_now){
1063
return;
1064
}
1065
1066
switch(event){
776
switch (event) {
1067
777
default:
1068
778
case AVAHI_BROWSER_FAILURE:
1069
779
1070
fprintf_plus(stderr, "(Avahi browser) %s\n",
1071
avahi_strerror(avahi_server_errno(mc.server)));
1072
avahi_simple_poll_quit(mc.simple_poll);
780
fprintf(stderr, "(Avahi browser) %s\n",
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
1073
783
return;
1074
784
1075
785
case AVAHI_BROWSER_NEW:
1078
788
the callback function is called the Avahi server will free the
1079
789
resolver for us. */
1080
790
1081
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1082
name, type, domain, protocol, 0,
1083
resolve_callback, NULL) == NULL)
1084
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1085
" %s\n", name,
1086
avahi_strerror(avahi_server_errno(mc.server)));
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
795
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
796
name, avahi_strerror(avahi_server_errno(mc->server)));
1087
797
break;
1088
798
1089
799
case AVAHI_BROWSER_REMOVE:
1092
802
case AVAHI_BROWSER_ALL_FOR_NOW:
1093
803
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1094
804
if(debug){
1095
fprintf_plus(stderr, "No Mandos server found, still"
1096
" searching...\n");
805
fprintf(stderr, "No Mandos server found, still searching...\n");
1097
806
}
1098
807
break;
1099
808
}
1100
809
}
1101
810
1102
/* Signal handler that stops main loop after SIGTERM */
1103
static void handle_sigterm(int sig){
1104
if(quit_now){
1105
return;
1106
}
1107
quit_now = 1;
1108
signal_received = sig;
1109
int old_errno = errno;
1110
/* set main loop to exit */
1111
if(mc.simple_poll != NULL){
1112
avahi_simple_poll_quit(mc.simple_poll);
1113
}
1114
errno = old_errno;
1115
}
1116
1117
bool get_flags(const char *ifname, struct ifreq *ifr){
1118
int ret;
1119
1120
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1121
if(s < 0){
1122
perror_plus("socket");
1123
return false;
1124
}
1125
strcpy(ifr->ifr_name, ifname);
1126
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1127
if(ret == -1){
1128
if(debug){
1129
perror_plus("ioctl SIOCGIFFLAGS");
1130
}
1131
return false;
1132
}
1133
return true;
1134
}
1135
1136
bool good_flags(const char *ifname, const struct ifreq *ifr){
1137
1138
/* Reject the loopback device */
1139
if(ifr->ifr_flags & IFF_LOOPBACK){
1140
if(debug){
1141
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1142
ifname);
1143
}
1144
return false;
1145
}
1146
/* Accept point-to-point devices only if connect_to is specified */
1147
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1148
if(debug){
1149
fprintf_plus(stderr, "Accepting point-to-point interface"
1150
" \"%s\"\n", ifname);
1151
}
1152
return true;
1153
}
1154
/* Otherwise, reject non-broadcast-capable devices */
1155
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1156
if(debug){
1157
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1158
" \"%s\"\n", ifname);
1159
}
1160
return false;
1161
}
1162
/* Reject non-ARP interfaces (including dummy interfaces) */
1163
if(ifr->ifr_flags & IFF_NOARP){
1164
if(debug){
1165
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1166
ifname);
1167
}
1168
return false;
1169
}
1170
1171
/* Accept this device */
1172
if(debug){
1173
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1174
}
1175
return true;
1176
}
1177
1178
/*
1179
* This function determines if a directory entry in /sys/class/net
1180
* corresponds to an acceptable network device.
1181
* (This function is passed to scandir(3) as a filter function.)
1182
*/
1183
int good_interface(const struct dirent *if_entry){
1184
if(if_entry->d_name[0] == '.'){
1185
return 0;
1186
}
1187
1188
struct ifreq ifr;
1189
if(not get_flags(if_entry->d_name, &ifr)){
1190
if(debug){
1191
fprintf_plus(stderr, "Failed to get flags for interface "
1192
"\"%s\"\n", if_entry->d_name);
1193
}
1194
return 0;
1195
}
1196
1197
if(not good_flags(if_entry->d_name, &ifr)){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
/*
1204
* This function determines if a directory entry in /sys/class/net
1205
* corresponds to an acceptable network device which is up.
1206
* (This function is passed to scandir(3) as a filter function.)
1207
*/
1208
int up_interface(const struct dirent *if_entry){
1209
if(if_entry->d_name[0] == '.'){
1210
return 0;
1211
}
1212
1213
struct ifreq ifr;
1214
if(not get_flags(if_entry->d_name, &ifr)){
1215
if(debug){
1216
fprintf_plus(stderr, "Failed to get flags for interface "
1217
"\"%s\"\n", if_entry->d_name);
1218
}
1219
return 0;
1220
}
1221
1222
/* Reject down interfaces */
1223
if(not (ifr.ifr_flags & IFF_UP)){
1224
if(debug){
1225
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1226
if_entry->d_name);
1227
}
1228
return 0;
1229
}
1230
1231
/* Reject non-running interfaces */
1232
if(not (ifr.ifr_flags & IFF_RUNNING)){
1233
if(debug){
1234
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1235
if_entry->d_name);
1236
}
1237
return 0;
1238
}
1239
1240
if(not good_flags(if_entry->d_name, &ifr)){
1241
return 0;
1242
}
1243
return 1;
1244
}
1245
1246
int notdotentries(const struct dirent *direntry){
1247
/* Skip "." and ".." */
1248
if(direntry->d_name[0] == '.'
1249
and (direntry->d_name[1] == '\0'
1250
or (direntry->d_name[1] == '.'
1251
and direntry->d_name[2] == '\0'))){
1252
return 0;
1253
}
1254
return 1;
1255
}
1256
1257
/* Is this directory entry a runnable program? */
1258
int runnable_hook(const struct dirent *direntry){
1259
int ret;
1260
size_t sret;
1261
struct stat st;
1262
1263
if((direntry->d_name)[0] == '\0'){
1264
/* Empty name? */
1265
return 0;
1266
}
1267
1268
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1269
"abcdefghijklmnopqrstuvwxyz"
1270
"0123456789"
1271
"_-");
1272
if((direntry->d_name)[sret] != '\0'){
1273
/* Contains non-allowed characters */
1274
if(debug){
1275
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1276
direntry->d_name);
1277
}
1278
return 0;
1279
}
1280
1281
char *fullname = NULL;
1282
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1283
if(ret < 0){
1284
perror_plus("asprintf");
1285
return 0;
1286
}
1287
1288
ret = stat(fullname, &st);
1289
if(ret == -1){
1290
if(debug){
1291
perror_plus("Could not stat hook");
1292
}
1293
return 0;
1294
}
1295
if(not (S_ISREG(st.st_mode))){
1296
/* Not a regular file */
1297
if(debug){
1298
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1299
direntry->d_name);
1300
}
1301
return 0;
1302
}
1303
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1304
/* Not executable */
1305
if(debug){
1306
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1307
direntry->d_name);
1308
}
1309
return 0;
1310
}
1311
if(debug){
1312
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1313
direntry->d_name);
1314
}
1315
return 1;
1316
}
1317
1318
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1319
int ret;
1320
struct timespec now;
1321
struct timespec waited_time;
1322
intmax_t block_time;
1323
1324
while(true){
1325
if(mc.current_server == NULL){
1326
if (debug){
1327
fprintf_plus(stderr, "Wait until first server is found."
1328
" No timeout!\n");
1329
}
1330
ret = avahi_simple_poll_iterate(s, -1);
1331
} else {
1332
if (debug){
1333
fprintf_plus(stderr, "Check current_server if we should run"
1334
" it, or wait\n");
1335
}
1336
/* the current time */
1337
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
/* Calculating in ms how long time between now and server
1343
who we visted longest time ago. Now - last seen. */
1344
waited_time.tv_sec = (now.tv_sec
1345
- mc.current_server->last_seen.tv_sec);
1346
waited_time.tv_nsec = (now.tv_nsec
1347
- mc.current_server->last_seen.tv_nsec);
1348
/* total time is 10s/10,000ms.
1349
Converting to s from ms by dividing by 1,000,
1350
and ns to ms by dividing by 1,000,000. */
1351
block_time = ((retry_interval
1352
- ((intmax_t)waited_time.tv_sec * 1000))
1353
- ((intmax_t)waited_time.tv_nsec / 1000000));
1354
1355
if (debug){
1356
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1357
block_time);
1358
}
1359
1360
if(block_time <= 0){
1361
ret = start_mandos_communication(mc.current_server->ip,
1362
mc.current_server->port,
1363
mc.current_server->if_index,
1364
mc.current_server->af);
1365
if(ret == 0){
1366
avahi_simple_poll_quit(mc.simple_poll);
1367
return 0;
1368
}
1369
ret = clock_gettime(CLOCK_MONOTONIC,
1370
&mc.current_server->last_seen);
1371
if(ret == -1){
1372
perror_plus("clock_gettime");
1373
return -1;
1374
}
1375
mc.current_server = mc.current_server->next;
1376
block_time = 0; /* Call avahi to find new Mandos
1377
servers, but don't block */
1378
}
1379
1380
ret = avahi_simple_poll_iterate(s, (int)block_time);
1381
}
1382
if(ret != 0){
1383
if (ret > 0 or errno != EINTR){
1384
return (ret != 1) ? ret : 0;
1385
}
1386
}
1387
}
1388
}
1389
1390
bool run_network_hooks(const char *mode, const char *interface,
1391
const float delay){
1392
struct dirent **direntries;
1393
struct dirent *direntry;
1394
int ret;
1395
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1396
alphasort);
1397
if(numhooks == -1){
1398
perror_plus("scandir");
1399
} else {
1400
int devnull = open("/dev/null", O_RDONLY);
1401
for(int i = 0; i < numhooks; i++){
1402
direntry = direntries[i];
1403
char *fullname = NULL;
1404
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1405
if(ret < 0){
1406
perror_plus("asprintf");
1407
continue;
1408
}
1409
if(debug){
1410
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1411
direntry->d_name);
1412
}
1413
pid_t hook_pid = fork();
1414
if(hook_pid == 0){
1415
/* Child */
1416
/* Raise privileges */
1417
errno = 0;
1418
ret = seteuid(0);
1419
if(ret == -1){
1420
perror_plus("seteuid");
1421
}
1422
/* Raise privileges even more */
1423
errno = 0;
1424
ret = setuid(0);
1425
if(ret == -1){
1426
perror_plus("setuid");
1427
}
1428
/* Set group */
1429
errno = 0;
1430
ret = setgid(0);
1431
if(ret == -1){
1432
perror_plus("setgid");
1433
}
1434
/* Reset supplementary groups */
1435
errno = 0;
1436
ret = setgroups(0, NULL);
1437
if(ret == -1){
1438
perror_plus("setgroups");
1439
}
1440
dup2(devnull, STDIN_FILENO);
1441
close(devnull);
1442
dup2(STDERR_FILENO, STDOUT_FILENO);
1443
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1444
if(ret == -1){
1445
perror_plus("setenv");
1446
_exit(EX_OSERR);
1447
}
1448
ret = setenv("DEVICE", interface, 1);
1449
if(ret == -1){
1450
perror_plus("setenv");
1451
_exit(EX_OSERR);
1452
}
1453
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1454
if(ret == -1){
1455
perror_plus("setenv");
1456
_exit(EX_OSERR);
1457
}
1458
ret = setenv("MODE", mode, 1);
1459
if(ret == -1){
1460
perror_plus("setenv");
1461
_exit(EX_OSERR);
1462
}
1463
char *delaystring;
1464
ret = asprintf(&delaystring, "%f", delay);
1465
if(ret == -1){
1466
perror_plus("asprintf");
1467
_exit(EX_OSERR);
1468
}
1469
ret = setenv("DELAY", delaystring, 1);
1470
if(ret == -1){
1471
free(delaystring);
1472
perror_plus("setenv");
1473
_exit(EX_OSERR);
1474
}
1475
free(delaystring);
1476
if(connect_to != NULL){
1477
ret = setenv("CONNECT", connect_to, 1);
1478
if(ret == -1){
1479
perror_plus("setenv");
1480
_exit(EX_OSERR);
1481
}
1482
}
1483
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1484
perror_plus("execl");
1485
_exit(EXIT_FAILURE);
1486
}
1487
} else {
1488
int status;
1489
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1490
perror_plus("waitpid");
1491
free(fullname);
1492
continue;
1493
}
1494
if(WIFEXITED(status)){
1495
if(WEXITSTATUS(status) != 0){
1496
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1497
" with status %d\n", direntry->d_name,
1498
WEXITSTATUS(status));
1499
free(fullname);
1500
continue;
1501
}
1502
} else if(WIFSIGNALED(status)){
1503
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1504
" signal %d\n", direntry->d_name,
1505
WTERMSIG(status));
1506
free(fullname);
1507
continue;
1508
} else {
1509
fprintf_plus(stderr, "Warning: network hook \"%s\""
1510
" crashed\n", direntry->d_name);
1511
free(fullname);
1512
continue;
1513
}
1514
}
1515
free(fullname);
1516
if(debug){
1517
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1518
direntry->d_name);
1519
}
1520
}
1521
close(devnull);
1522
}
1523
return true;
1524
}
1525
1526
811
int main(int argc, char *argv[]){
1527
AvahiSServiceBrowser *sb = NULL;
1528
int error;
1529
int ret;
1530
intmax_t tmpmax;
1531
char *tmp;
1532
int exitcode = EXIT_SUCCESS;
1533
const char *interface = "";
1534
struct ifreq network;
1535
int sd = -1;
1536
bool take_down_interface = false;
1537
uid_t uid;
1538
gid_t gid;
1539
char tempdir[] = "/tmp/mandosXXXXXX";
1540
bool tempdir_created = false;
1541
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1542
const char *seckey = PATHDIR "/" SECKEY;
1543
const char *pubkey = PATHDIR "/" PUBKEY;
1544
1545
bool gnutls_initialized = false;
1546
bool gpgme_initialized = false;
1547
float delay = 2.5f;
1548
double retry_interval = 10; /* 10s between trying a server and
1549
retrying the same server again */
1550
1551
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1552
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1553
1554
uid = getuid();
1555
gid = getgid();
1556
1557
/* Lower any group privileges we might have, just to be safe */
1558
errno = 0;
1559
ret = setgid(gid);
1560
if(ret == -1){
1561
perror_plus("setgid");
1562
}
1563
1564
/* Lower user privileges (temporarily) */
1565
errno = 0;
1566
ret = seteuid(uid);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
{
1576
struct argp_option options[] = {
1577
{ .name = "debug", .key = 128,
1578
.doc = "Debug mode", .group = 3 },
1579
{ .name = "connect", .key = 'c',
1580
.arg = "ADDRESS:PORT",
1581
.doc = "Connect directly to a specific Mandos server",
1582
.group = 1 },
1583
{ .name = "interface", .key = 'i',
1584
.arg = "NAME",
1585
.doc = "Network interface that will be used to search for"
1586
" Mandos servers",
1587
.group = 1 },
1588
{ .name = "seckey", .key = 's',
1589
.arg = "FILE",
1590
.doc = "OpenPGP secret key file base name",
1591
.group = 1 },
1592
{ .name = "pubkey", .key = 'p',
1593
.arg = "FILE",
1594
.doc = "OpenPGP public key file base name",
1595
.group = 2 },
1596
{ .name = "dh-bits", .key = 129,
1597
.arg = "BITS",
1598
.doc = "Bit length of the prime number used in the"
1599
" Diffie-Hellman key exchange",
1600
.group = 2 },
1601
{ .name = "priority", .key = 130,
1602
.arg = "STRING",
1603
.doc = "GnuTLS priority string for the TLS handshake",
1604
.group = 1 },
1605
{ .name = "delay", .key = 131,
1606
.arg = "SECONDS",
1607
.doc = "Maximum delay to wait for interface startup",
1608
.group = 2 },
1609
{ .name = "retry", .key = 132,
1610
.arg = "SECONDS",
1611
.doc = "Retry interval used when denied by the Mandos server",
1612
.group = 2 },
1613
{ .name = "network-hook-dir", .key = 133,
1614
.arg = "DIR",
1615
.doc = "Directory where network hooks are located",
1616
.group = 2 },
1617
/*
1618
* These reproduce what we would get without ARGP_NO_HELP
1619
*/
1620
{ .name = "help", .key = '?',
1621
.doc = "Give this help list", .group = -1 },
1622
{ .name = "usage", .key = -3,
1623
.doc = "Give a short usage message", .group = -1 },
1624
{ .name = "version", .key = 'V',
1625
.doc = "Print program version", .group = -1 },
1626
{ .name = NULL }
1627
};
1628
1629
error_t parse_opt(int key, char *arg,
1630
struct argp_state *state){
1631
errno = 0;
1632
switch(key){
1633
case 128: /* --debug */
1634
debug = true;
1635
break;
1636
case 'c': /* --connect */
1637
connect_to = arg;
1638
break;
1639
case 'i': /* --interface */
1640
interface = arg;
1641
break;
1642
case 's': /* --seckey */
1643
seckey = arg;
1644
break;
1645
case 'p': /* --pubkey */
1646
pubkey = arg;
1647
break;
1648
case 129: /* --dh-bits */
1649
errno = 0;
1650
tmpmax = strtoimax(arg, &tmp, 10);
1651
if(errno != 0 or tmp == arg or *tmp != '\0'
1652
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1653
argp_error(state, "Bad number of DH bits");
1654
}
1655
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1656
break;
1657
case 130: /* --priority */
1658
mc.priority = arg;
1659
break;
1660
case 131: /* --delay */
1661
errno = 0;
1662
delay = strtof(arg, &tmp);
1663
if(errno != 0 or tmp == arg or *tmp != '\0'){
1664
argp_error(state, "Bad delay");
1665
}
1666
case 132: /* --retry */
1667
errno = 0;
1668
retry_interval = strtod(arg, &tmp);
1669
if(errno != 0 or tmp == arg or *tmp != '\0'
1670
or (retry_interval * 1000) > INT_MAX
1671
or retry_interval < 0){
1672
argp_error(state, "Bad retry interval");
1673
}
1674
break;
1675
case 133: /* --network-hook-dir */
1676
hookdir = arg;
1677
break;
1678
/*
1679
* These reproduce what we would get without ARGP_NO_HELP
1680
*/
1681
case '?': /* --help */
1682
argp_state_help(state, state->out_stream,
1683
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1684
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1685
case -3: /* --usage */
1686
argp_state_help(state, state->out_stream,
1687
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1688
case 'V': /* --version */
1689
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1690
exit(argp_err_exit_status);
1691
break;
1692
default:
1693
return ARGP_ERR_UNKNOWN;
1694
}
1695
return errno;
1696
}
1697
1698
struct argp argp = { .options = options, .parser = parse_opt,
1699
.args_doc = "",
1700
.doc = "Mandos client -- Get and decrypt"
1701
" passwords from a Mandos server" };
1702
ret = argp_parse(&argp, argc, argv,
1703
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1704
switch(ret){
1705
case 0:
1706
break;
1707
case ENOMEM:
1708
default:
1709
errno = ret;
1710
perror_plus("argp_parse");
1711
exitcode = EX_OSERR;
1712
goto end;
1713
case EINVAL:
1714
exitcode = EX_USAGE;
1715
goto end;
1716
}
1717
}
1718
1719
{
1720
/* Work around Debian bug #633582:
1721
<http://bugs.debian.org/633582> */
1722
1723
/* Re-raise priviliges */
1724
errno = 0;
1725
ret = seteuid(0);
1726
if(ret == -1){
1727
perror_plus("seteuid");
1728
} else {
1729
struct stat st;
1730
1731
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1732
int seckey_fd = open(seckey, O_RDONLY);
1733
if(seckey_fd == -1){
1734
perror_plus("open");
1735
} else {
1736
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1737
if(ret == -1){
1738
perror_plus("fstat");
1739
} else {
1740
if(S_ISREG(st.st_mode)
1741
and st.st_uid == 0 and st.st_gid == 0){
1742
ret = fchown(seckey_fd, uid, gid);
1743
if(ret == -1){
1744
perror_plus("fchown");
1745
}
1746
}
1747
}
1748
TEMP_FAILURE_RETRY(close(seckey_fd));
1749
}
1750
}
1751
1752
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1753
int pubkey_fd = open(pubkey, O_RDONLY);
1754
if(pubkey_fd == -1){
1755
perror_plus("open");
1756
} else {
1757
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1758
if(ret == -1){
1759
perror_plus("fstat");
1760
} else {
1761
if(S_ISREG(st.st_mode)
1762
and st.st_uid == 0 and st.st_gid == 0){
1763
ret = fchown(pubkey_fd, uid, gid);
1764
if(ret == -1){
1765
perror_plus("fchown");
1766
}
1767
}
1768
}
1769
TEMP_FAILURE_RETRY(close(pubkey_fd));
1770
}
1771
}
1772
1773
/* Lower privileges */
1774
errno = 0;
1775
ret = seteuid(uid);
1776
if(ret == -1){
1777
perror_plus("seteuid");
1778
}
1779
}
1780
}
1781
1782
/* Run network hooks */
1783
if(not run_network_hooks("start", interface, delay)){
1784
goto end;
1785
}
1786
1787
if(not debug){
1788
avahi_set_log_function(empty_log);
1789
}
1790
1791
if(interface[0] == '\0'){
1792
struct dirent **direntries;
1793
/* First look for interfaces that are up */
1794
ret = scandir(sys_class_net, &direntries, up_interface,
1795
alphasort);
1796
if(ret == 0){
1797
/* No up interfaces, look for any good interfaces */
1798
free(direntries);
1799
ret = scandir(sys_class_net, &direntries, good_interface,
1800
alphasort);
1801
}
1802
if(ret >= 1){
1803
/* Pick the first interface returned */
1804
interface = strdup(direntries[0]->d_name);
1805
if(debug){
1806
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1807
}
1808
if(interface == NULL){
1809
perror_plus("malloc");
1810
free(direntries);
1811
exitcode = EXIT_FAILURE;
1812
goto end;
1813
}
1814
free(direntries);
1815
} else {
1816
free(direntries);
1817
fprintf_plus(stderr, "Could not find a network interface\n");
1818
exitcode = EXIT_FAILURE;
1819
goto end;
1820
}
1821
}
1822
1823
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1824
from the signal handler */
1825
/* Initialize the pseudo-RNG for Avahi */
1826
srand((unsigned int) time(NULL));
1827
mc.simple_poll = avahi_simple_poll_new();
1828
if(mc.simple_poll == NULL){
1829
fprintf_plus(stderr,
1830
"Avahi: Failed to create simple poll object.\n");
1831
exitcode = EX_UNAVAILABLE;
1832
goto end;
1833
}
1834
1835
sigemptyset(&sigterm_action.sa_mask);
1836
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1837
if(ret == -1){
1838
perror_plus("sigaddset");
1839
exitcode = EX_OSERR;
1840
goto end;
1841
}
1842
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1843
if(ret == -1){
1844
perror_plus("sigaddset");
1845
exitcode = EX_OSERR;
1846
goto end;
1847
}
1848
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1849
if(ret == -1){
1850
perror_plus("sigaddset");
1851
exitcode = EX_OSERR;
1852
goto end;
1853
}
1854
/* Need to check if the handler is SIG_IGN before handling:
1855
| [[info:libc:Initial Signal Actions]] |
1856
| [[info:libc:Basic Signal Handling]] |
1857
*/
1858
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1859
if(ret == -1){
1860
perror_plus("sigaction");
1861
return EX_OSERR;
1862
}
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGINT, &sigterm_action, NULL);
1865
if(ret == -1){
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1868
goto end;
1869
}
1870
}
1871
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1872
if(ret == -1){
1873
perror_plus("sigaction");
1874
return EX_OSERR;
1875
}
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1878
if(ret == -1){
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1881
goto end;
1882
}
1883
}
1884
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1885
if(ret == -1){
1886
perror_plus("sigaction");
1887
return EX_OSERR;
1888
}
1889
if(old_sigterm_action.sa_handler != SIG_IGN){
1890
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1891
if(ret == -1){
1892
perror_plus("sigaction");
1893
exitcode = EX_OSERR;
1894
goto end;
1895
}
1896
}
1897
1898
/* If the interface is down, bring it up */
1899
if(strcmp(interface, "none") != 0){
812
AvahiSServiceBrowser *sb = NULL;
813
int error;
814
int ret;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
818
int sd;
819
uid_t uid;
820
gid_t gid;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
832
833
{
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
887
errno = 0;
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
889
if (errno){
890
perror("strtol");
891
exit(EXIT_FAILURE);
892
}
893
break;
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
901
default:
902
return ARGP_ERR_UNKNOWN;
903
}
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
if(ret == -1){
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
944
if(ret == -1){
945
perror("close");
946
}
947
}
948
949
uid = getuid();
950
gid = getgid();
951
952
ret = setuid(uid);
953
if (ret == -1){
954
perror("setuid");
955
}
956
957
setgid(gid);
958
if (ret == -1){
959
perror("setgid");
960
}
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
1900
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
1901
986
if(if_index == 0){
1902
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1903
exitcode = EX_UNAVAILABLE;
1904
goto end;
1905
}
1906
1907
if(quit_now){
1908
goto end;
1909
}
1910
1911
/* Re-raise priviliges */
1912
errno = 0;
1913
ret = seteuid(0);
1914
if(ret == -1){
1915
perror_plus("seteuid");
1916
}
1917
1918
#ifdef __linux__
1919
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1920
messages about the network interface to mess up the prompt */
1921
ret = klogctl(8, NULL, 5);
1922
bool restore_loglevel = true;
1923
if(ret == -1){
1924
restore_loglevel = false;
1925
perror_plus("klogctl");
1926
}
1927
#endif /* __linux__ */
1928
1929
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1930
if(sd < 0){
1931
perror_plus("socket");
1932
exitcode = EX_OSERR;
1933
#ifdef __linux__
1934
if(restore_loglevel){
1935
ret = klogctl(7, NULL, 0);
1936
if(ret == -1){
1937
perror_plus("klogctl");
1938
}
1939
}
1940
#endif /* __linux__ */
1941
/* Lower privileges */
1942
errno = 0;
1943
ret = seteuid(uid);
1944
if(ret == -1){
1945
perror_plus("seteuid");
1946
}
1947
goto end;
1948
}
1949
strcpy(network.ifr_name, interface);
1950
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1951
if(ret == -1){
1952
perror_plus("ioctl SIOCGIFFLAGS");
1953
#ifdef __linux__
1954
if(restore_loglevel){
1955
ret = klogctl(7, NULL, 0);
1956
if(ret == -1){
1957
perror_plus("klogctl");
1958
}
1959
}
1960
#endif /* __linux__ */
1961
exitcode = EX_OSERR;
1962
/* Lower privileges */
1963
errno = 0;
1964
ret = seteuid(uid);
1965
if(ret == -1){
1966
perror_plus("seteuid");
1967
}
1968
goto end;
1969
}
1970
if((network.ifr_flags & IFF_UP) == 0){
1971
network.ifr_flags |= IFF_UP;
1972
take_down_interface = true;
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
take_down_interface = false;
1976
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1977
exitcode = EX_OSERR;
1978
#ifdef __linux__
1979
if(restore_loglevel){
1980
ret = klogctl(7, NULL, 0);
1981
if(ret == -1){
1982
perror_plus("klogctl");
1983
}
1984
}
1985
#endif /* __linux__ */
1986
/* Lower privileges */
1987
errno = 0;
1988
ret = seteuid(uid);
1989
if(ret == -1){
1990
perror_plus("seteuid");
1991
}
1992
goto end;
1993
}
1994
}
1995
/* Sleep checking until interface is running.
1996
Check every 0.25s, up to total time of delay */
1997
for(int i=0; i < delay * 4; i++){
1998
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1999
if(ret == -1){
2000
perror_plus("ioctl SIOCGIFFLAGS");
2001
} else if(network.ifr_flags & IFF_RUNNING){
2002
break;
2003
}
2004
struct timespec sleeptime = { .tv_nsec = 250000000 };
2005
ret = nanosleep(&sleeptime, NULL);
2006
if(ret == -1 and errno != EINTR){
2007
perror_plus("nanosleep");
2008
}
2009
}
2010
if(not take_down_interface){
2011
/* We won't need the socket anymore */
2012
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2013
if(ret == -1){
2014
perror_plus("close");
2015
}
2016
}
2017
#ifdef __linux__
2018
if(restore_loglevel){
2019
/* Restores kernel loglevel to default */
2020
ret = klogctl(7, NULL, 0);
2021
if(ret == -1){
2022
perror_plus("klogctl");
2023
}
2024
}
2025
#endif /* __linux__ */
2026
/* Lower privileges */
2027
errno = 0;
2028
/* Lower privileges */
2029
ret = seteuid(uid);
2030
if(ret == -1){
2031
perror_plus("seteuid");
2032
}
2033
}
2034
2035
if(quit_now){
2036
goto end;
2037
}
2038
2039
ret = init_gnutls_global(pubkey, seckey);
2040
if(ret == -1){
2041
fprintf_plus(stderr, "init_gnutls_global failed\n");
2042
exitcode = EX_UNAVAILABLE;
2043
goto end;
2044
} else {
2045
gnutls_initialized = true;
2046
}
2047
2048
if(quit_now){
2049
goto end;
2050
}
2051
2052
if(mkdtemp(tempdir) == NULL){
2053
perror_plus("mkdtemp");
2054
goto end;
2055
}
2056
tempdir_created = true;
2057
2058
if(quit_now){
2059
goto end;
2060
}
2061
2062
if(not init_gpgme(pubkey, seckey, tempdir)){
2063
fprintf_plus(stderr, "init_gpgme failed\n");
2064
exitcode = EX_UNAVAILABLE;
2065
goto end;
2066
} else {
2067
gpgme_initialized = true;
2068
}
2069
2070
if(quit_now){
2071
goto end;
2072
}
2073
2074
if(connect_to != NULL){
2075
/* Connect directly, do not use Zeroconf */
2076
/* (Mainly meant for debugging) */
2077
char *address = strrchr(connect_to, ':');
2078
if(address == NULL){
2079
fprintf_plus(stderr, "No colon in address\n");
2080
exitcode = EX_USAGE;
2081
goto end;
2082
}
2083
2084
if(quit_now){
2085
goto end;
2086
}
2087
2088
uint16_t port;
2089
errno = 0;
2090
tmpmax = strtoimax(address+1, &tmp, 10);
2091
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2092
or tmpmax != (uint16_t)tmpmax){
2093
fprintf_plus(stderr, "Bad port number\n");
2094
exitcode = EX_USAGE;
2095
goto end;
2096
}
2097
2098
if(quit_now){
2099
goto end;
2100
}
2101
2102
port = (uint16_t)tmpmax;
2103
*address = '\0';
2104
/* Colon in address indicates IPv6 */
2105
int af;
2106
if(strchr(connect_to, ':') != NULL){
2107
af = AF_INET6;
2108
/* Accept [] around IPv6 address - see RFC 5952 */
2109
if(connect_to[0] == '[' and address[-1] == ']')
2110
{
2111
connect_to++;
2112
address[-1] = '\0';
2113
}
2114
} else {
2115
af = AF_INET;
2116
}
2117
address = connect_to;
2118
2119
if(quit_now){
2120
goto end;
2121
}
2122
2123
while(not quit_now){
2124
ret = start_mandos_communication(address, port, if_index, af);
2125
if(quit_now or ret == 0){
2126
break;
2127
}
2128
if(debug){
2129
fprintf_plus(stderr, "Retrying in %d seconds\n",
2130
(int)retry_interval);
2131
}
2132
sleep((int)retry_interval);
2133
}
2134
2135
if (not quit_now){
2136
exitcode = EXIT_SUCCESS;
2137
}
2138
2139
goto end;
2140
}
2141
2142
if(quit_now){
2143
goto end;
2144
}
2145
2146
{
2147
AvahiServerConfig config;
2148
/* Do not publish any local Zeroconf records */
2149
avahi_server_config_init(&config);
2150
config.publish_hinfo = 0;
2151
config.publish_addresses = 0;
2152
config.publish_workstation = 0;
2153
config.publish_domain = 0;
2154
2155
/* Allocate a new server */
2156
mc.server = avahi_server_new(avahi_simple_poll_get
2157
(mc.simple_poll), &config, NULL,
2158
NULL, &error);
2159
2160
/* Free the Avahi configuration data */
2161
avahi_server_config_free(&config);
2162
}
2163
2164
/* Check if creating the Avahi server object succeeded */
2165
if(mc.server == NULL){
2166
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2167
avahi_strerror(error));
2168
exitcode = EX_UNAVAILABLE;
2169
goto end;
2170
}
2171
2172
if(quit_now){
2173
goto end;
2174
}
2175
2176
/* Create the Avahi service browser */
2177
sb = avahi_s_service_browser_new(mc.server, if_index,
2178
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2179
NULL, 0, browse_callback, NULL);
2180
if(sb == NULL){
2181
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2182
avahi_strerror(avahi_server_errno(mc.server)));
2183
exitcode = EX_UNAVAILABLE;
2184
goto end;
2185
}
2186
2187
if(quit_now){
2188
goto end;
2189
}
2190
2191
/* Run the main loop */
2192
2193
if(debug){
2194
fprintf_plus(stderr, "Starting Avahi loop search\n");
2195
}
2196
2197
ret = avahi_loop_with_timeout(mc.simple_poll,
2198
(int)(retry_interval * 1000));
2199
if(debug){
2200
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2201
(ret == 0) ? "successfully" : "with error");
2202
}
2203
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
988
exit(EXIT_FAILURE);
989
}
990
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
995
if(address == NULL){
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
998
goto end;
999
}
1000
errno = 0;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
if(errno){
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
*address = '\0';
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1010
if(ret < 0){
1011
exitcode = EXIT_FAILURE;
1012
} else {
1013
exitcode = EXIT_SUCCESS;
1014
}
1015
goto end;
1016
}
1017
1018
if (not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1024
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
" object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
{
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1042
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1046
NULL, &error);
1047
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1050
}
1051
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
AVAHI_PROTO_INET6,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1065
if (sb == NULL) {
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Run the main loop */
1073
1074
if (debug){
1075
fprintf(stderr, "Starting Avahi loop search\n");
1076
}
1077
1078
avahi_simple_poll_loop(mc.simple_poll);
1079
2204
1080
end:
2205
2206
if(debug){
2207
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2208
}
2209
2210
/* Cleanup things */
2211
if(sb != NULL)
2212
avahi_s_service_browser_free(sb);
2213
2214
if(mc.server != NULL)
2215
avahi_server_free(mc.server);
2216
2217
if(mc.simple_poll != NULL)
2218
avahi_simple_poll_free(mc.simple_poll);
2219
2220
if(gnutls_initialized){
2221
gnutls_certificate_free_credentials(mc.cred);
2222
gnutls_global_deinit();
2223
gnutls_dh_params_deinit(mc.dh_params);
2224
}
2225
2226
if(gpgme_initialized){
2227
gpgme_release(mc.ctx);
2228
}
2229
2230
/* Cleans up the circular linked list of Mandos servers the client
2231
has seen */
2232
if(mc.current_server != NULL){
2233
mc.current_server->prev->next = NULL;
2234
while(mc.current_server != NULL){
2235
server *next = mc.current_server->next;
2236
free(mc.current_server);
2237
mc.current_server = next;
2238
}
2239
}
2240
2241
/* Run network hooks */
2242
run_network_hooks("stop", interface, delay);
2243
2244
/* Re-raise priviliges */
2245
{
2246
errno = 0;
2247
ret = seteuid(0);
2248
if(ret == -1){
2249
perror_plus("seteuid");
2250
}
2251
2252
/* Take down the network interface */
2253
if(take_down_interface and geteuid() == 0){
2254
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2255
if(ret == -1){
2256
perror_plus("ioctl SIOCGIFFLAGS");
2257
} else if(network.ifr_flags & IFF_UP){
2258
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2259
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2260
if(ret == -1){
2261
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2262
}
2263
}
2264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2265
if(ret == -1){
2266
perror_plus("close");
2267
}
2268
}
2269
}
2270
/* Lower privileges permanently */
2271
errno = 0;
2272
ret = setuid(uid);
2273
if(ret == -1){
2274
perror_plus("setuid");
2275
}
2276
2277
/* Removes the GPGME temp directory and all files inside */
2278
if(tempdir_created){
2279
struct dirent **direntries = NULL;
2280
struct dirent *direntry = NULL;
2281
int numentries = scandir(tempdir, &direntries, notdotentries,
2282
alphasort);
2283
if (numentries > 0){
2284
for(int i = 0; i < numentries; i++){
2285
direntry = direntries[i];
2286
char *fullname = NULL;
2287
ret = asprintf(&fullname, "%s/%s", tempdir,
2288
direntry->d_name);
2289
if(ret < 0){
2290
perror_plus("asprintf");
2291
continue;
2292
}
2293
ret = remove(fullname);
2294
if(ret == -1){
2295
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2296
strerror(errno));
2297
}
2298
free(fullname);
2299
}
2300
}
2301
2302
/* need to clean even if 0 because man page doesn't specify */
2303
free(direntries);
2304
if (numentries == -1){
2305
perror_plus("scandir");
2306
}
2307
ret = rmdir(tempdir);
2308
if(ret == -1 and errno != ENOENT){
2309
perror_plus("rmdir");
2310
}
2311
}
2312
2313
if(quit_now){
2314
sigemptyset(&old_sigterm_action.sa_mask);
2315
old_sigterm_action.sa_handler = SIG_DFL;
2316
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2317
&old_sigterm_action,
2318
NULL));
2319
if(ret == -1){
2320
perror_plus("sigaction");
2321
}
2322
do {
2323
ret = raise(signal_received);
2324
} while(ret != 0 and errno == EINTR);
2325
if(ret != 0){
2326
perror_plus("raise");
2327
abort();
2328
}
2329
TEMP_FAILURE_RETRY(pause());
2330
}
2331
2332
return exitcode;
1081
1082
if (debug){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1084
}
1085
1086
/* Cleanup things */
1087
if (sb != NULL)
1088
avahi_s_service_browser_free(sb);
1089
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1092
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1112
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
2333
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0