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237.7.447
(compared to revision 237.2.86)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2017-02-23 19:11:11 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 358.
- Revision ID: teddy@recompile.se-20170223191111-poodzw0cr26utaz0
Update copyright year to 2017
* DBUS-API: Update copyright year to 2017.
* debian/copyright: - '' -
* intro.xml: - '' -
* mandos: - '' -
* mandos-clients.conf.xml: - '' -
* mandos-ctl: - '' -
* mandos-ctl.xml: - '' -
* mandos-keygen: - '' -
* mandos-keygen.xml: - '' -
* mandos-monitor: - '' -
* mandos-monitor.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-helpers/mandos-client-iprouteadddel.c: - '' -
* plugin-runner.c: - '' -
* plugin-runner.xml: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/askpass-fifo.xml: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugins.d/plymouth.c: - '' -
* plugins.d/plymouth.xml: - '' -
* plugins.d/splashy.c: - '' -
* plugins.d/splashy.xml: - '' -
* plugins.d/usplash.c: - '' -
* plugins.d/usplash.xml: - '' -
* DBUS-API: Update copyright year to 2017.
* debian/copyright: - '' -
* intro.xml: - '' -
* mandos: - '' -
* mandos-clients.conf.xml: - '' -
* mandos-ctl: - '' -
* mandos-ctl.xml: - '' -
* mandos-keygen: - '' -
* mandos-keygen.xml: - '' -
* mandos-monitor: - '' -
* mandos-monitor.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-helpers/mandos-client-iprouteadddel.c: - '' -
* plugin-runner.c: - '' -
* plugin-runner.xml: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/askpass-fifo.xml: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugins.d/plymouth.c: - '' -
* plugins.d/plymouth.xml: - '' -
* plugins.d/splashy.c: - '' -
* plugins.d/splashy.xml: - '' -
* plugins.d/usplash.c: - '' -
* plugins.d/usplash.xml: - '' -
- files added:
- DBUS-API
- debian/source
- debian/upstream
- network-hooks.d
- plugin-helpers
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2008-2017 Teddy Hogeborn
13
* Copyright © 2008-2017 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@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif
38
#endif /* not _FILE_OFFSET_BITS */
39
39
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
41
42
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
51
*/
51
52
#include <sys/ioctl.h> /* ioctl */
52
53
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
54
sockaddr_in6, PF_INET6,
54
55
SOCK_STREAM, uid_t, gid_t, open(),
55
56
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#include <sys/stat.h> /* open(), S_ISREG */
57
58
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
59
inet_pton(), connect(),
60
getnameinfo() */
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
60
62
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
63
*/
62
64
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
65
strtoimax() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
70
ENOTEMPTY,
71
program_invocation_short_name */
72
#include <time.h> /* nanosleep(), time(), sleep() */
67
73
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
74
SIOCSIFFLAGS, if_indextoname(),
69
75
if_nametoindex(), IF_NAMESIZE */
71
77
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
78
*/
73
79
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
80
getuid(), getgid(), seteuid(),
81
setgid(), pause(), _exit(),
82
unlinkat() */
83
#include <arpa/inet.h> /* inet_pton(), htons() */
77
84
#include <iso646.h> /* not, or, and */
78
85
#include <argp.h> /* struct argp_option, error_t, struct
79
86
argp_state, struct argp,
80
87
argp_parse(), ARGP_KEY_ARG,
81
88
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
89
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
90
sigaction(), SIGTERM, sig_atomic_t,
91
raise() */
92
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
93
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
94
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
95
WEXITSTATUS(), WTERMSIG() */
96
#include <grp.h> /* setgroups() */
97
#include <argz.h> /* argz_add_sep(), argz_next(),
98
argz_delete(), argz_append(),
99
argz_stringify(), argz_add(),
100
argz_count() */
101
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
102
EAI_SYSTEM, gai_strerror() */
85
103
86
104
#ifdef __linux__
87
105
#include <sys/klog.h> /* klogctl() */
105
123
init_gnutls_session(),
106
124
GNUTLS_* */
107
125
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
126
/* gnutls_certificate_set_openpgp_key_file(),
127
GNUTLS_OPENPGP_FMT_BASE64 */
110
128
111
129
/* GPGME */
112
130
#include <gpgme.h> /* All GPGME types, constants and
120
138
#define PATHDIR "/conf/conf.d/mandos"
121
139
#define SECKEY "seckey.txt"
122
140
#define PUBKEY "pubkey.txt"
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
123
142
124
143
bool debug = false;
125
144
static const char mandos_protocol_version[] = "1";
126
145
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
147
static const char sys_class_net[] = "/sys/class/net";
148
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
150
int hookdir_fd = -1;
151
uid_t uid = 65534;
152
gid_t gid = 65534;
153
154
/* Doubly linked list that need to be circularly linked when used */
155
typedef struct server{
156
const char *ip;
157
in_port_t port;
158
AvahiIfIndex if_index;
159
int af;
160
struct timespec last_seen;
161
struct server *next;
162
struct server *prev;
163
} server;
128
164
129
165
/* Used for passing in values through the Avahi callback functions */
130
166
typedef struct {
131
AvahiSimplePoll *simple_poll;
132
167
AvahiServer *server;
133
168
gnutls_certificate_credentials_t cred;
134
169
unsigned int dh_bits;
135
170
gnutls_dh_params_t dh_params;
136
171
const char *priority;
137
172
gpgme_ctx_t ctx;
173
server *current_server;
174
char *interfaces;
175
size_t interfaces_size;
138
176
} mandos_context;
139
177
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
180
181
sig_atomic_t quit_now = 0;
182
int signal_received = 0;
183
184
/* Function to use when printing errors */
185
void perror_plus(const char *print_text){
186
int e = errno;
187
fprintf(stderr, "Mandos plugin %s: ",
188
program_invocation_short_name);
189
errno = e;
190
perror(print_text);
191
}
192
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_list ap;
196
va_start (ap, format);
197
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
201
}
144
202
145
203
/*
146
204
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
205
* bytes. "buffer_capacity" is how much is currently allocated,
148
206
* "buffer_length" is how much is already used.
149
207
*/
208
__attribute__((nonnull, warn_unused_result))
150
209
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
210
size_t buffer_capacity){
152
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
if(new_buf == NULL){
214
int old_errno = errno;
215
free(*buffer);
216
errno = old_errno;
217
*buffer = NULL;
155
218
return 0;
156
219
}
220
*buffer = new_buf;
157
221
buffer_capacity += BUFFER_SIZE;
158
222
}
159
223
return buffer_capacity;
160
224
}
161
225
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
230
int ret;
231
server *new_server = malloc(sizeof(server));
232
if(new_server == NULL){
233
perror_plus("malloc");
234
return false;
235
}
236
*new_server = (server){ .ip = strdup(ip),
237
.port = port,
238
.if_index = if_index,
239
.af = af };
240
if(new_server->ip == NULL){
241
perror_plus("strdup");
242
free(new_server);
243
return false;
244
}
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
if(ret == -1){
247
perror_plus("clock_gettime");
248
#ifdef __GNUC__
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
251
#endif
252
free((char *)(new_server->ip));
253
#ifdef __GNUC__
254
#pragma GCC diagnostic pop
255
#endif
256
free(new_server);
257
return false;
258
}
259
/* Special case of first server */
260
if(*current_server == NULL){
261
new_server->next = new_server;
262
new_server->prev = new_server;
263
*current_server = new_server;
264
} else {
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
268
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
270
}
271
return true;
272
}
273
162
274
/*
163
275
* Initialize GPGME.
164
276
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
281
mandos_context *mc){
168
282
gpgme_error_t rc;
169
283
gpgme_engine_info_t engine_info;
170
284
171
172
285
/*
173
286
* Helper function to insert pub and seckey to the engine keyring.
174
287
*/
175
bool import_key(const char *filename){
288
bool import_key(const char * const filename){
289
int ret;
176
290
int fd;
177
291
gpgme_data_t pgp_data;
178
292
179
293
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
294
if(fd == -1){
181
perror("open");
295
perror_plus("open");
182
296
return false;
183
297
}
184
298
185
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
300
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
189
303
return false;
190
304
}
191
305
192
rc = gpgme_op_import(mc.ctx, pgp_data);
306
rc = gpgme_op_import(mc->ctx, pgp_data);
193
307
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
196
310
return false;
197
311
}
198
312
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
313
ret = close(fd);
200
314
if(ret == -1){
201
perror("close");
315
perror_plus("close");
202
316
}
203
317
gpgme_data_release(pgp_data);
204
318
return true;
205
319
}
206
320
207
321
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
322
fprintf_plus(stderr, "Initializing GPGME\n");
209
323
}
210
324
211
325
/* Init GPGME */
212
326
gpgme_check_version(NULL);
213
327
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
328
if(rc != GPG_ERR_NO_ERROR){
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
217
331
return false;
218
332
}
219
333
220
/* Set GPGME home directory for the OpenPGP engine only */
334
/* Set GPGME home directory for the OpenPGP engine only */
221
335
rc = gpgme_get_engine_info(&engine_info);
222
336
if(rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
225
339
return false;
226
340
}
227
341
while(engine_info != NULL){
233
347
engine_info = engine_info->next;
234
348
}
235
349
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
351
tempdir);
237
352
return false;
238
353
}
239
354
240
355
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
356
rc = gpgme_new(&(mc->ctx));
242
357
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
360
gpgme_strerror(rc));
245
361
return false;
246
362
}
247
363
249
365
return false;
250
366
}
251
367
252
return true;
368
return true;
253
369
}
254
370
255
371
/*
256
372
* Decrypt OpenPGP data.
257
373
* Returns -1 on error
258
374
*/
375
__attribute__((nonnull, warn_unused_result))
259
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
377
size_t crypto_size,
261
char **plaintext){
378
char **plaintext,
379
mandos_context *mc){
262
380
gpgme_data_t dh_crypto, dh_plain;
263
381
gpgme_error_t rc;
264
382
ssize_t ret;
266
384
ssize_t plaintext_length = 0;
267
385
268
386
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
270
388
}
271
389
272
390
/* Create new GPGME data buffer from memory cryptotext */
273
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
392
0);
275
393
if(rc != GPG_ERR_NO_ERROR){
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
278
396
return -1;
279
397
}
280
398
281
399
/* Create new empty GPGME data buffer for the plaintext */
282
400
rc = gpgme_data_new(&dh_plain);
283
401
if(rc != GPG_ERR_NO_ERROR){
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
286
405
gpgme_data_release(dh_crypto);
287
406
return -1;
288
407
}
289
408
290
409
/* Decrypt data from the cryptotext data buffer to the plaintext
291
410
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
293
412
if(rc != GPG_ERR_NO_ERROR){
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
296
415
plaintext_length = -1;
297
416
if(debug){
298
417
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
418
result = gpgme_op_decrypt_result(mc->ctx);
300
419
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
302
421
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
307
426
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
309
428
}
310
429
gpgme_recipient_t recipient;
311
430
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
431
while(recipient != NULL){
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
438
? "No" : "Yes");
439
recipient = recipient->next;
322
440
}
323
441
}
324
442
}
326
444
}
327
445
328
446
if(debug){
329
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
330
448
}
331
449
332
450
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
451
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
452
perror_plus("gpgme_data_seek");
335
453
plaintext_length = -1;
336
454
goto decrypt_end;
337
455
}
339
457
*plaintext = NULL;
340
458
while(true){
341
459
plaintext_capacity = incbuffer(plaintext,
342
(size_t)plaintext_length,
343
plaintext_capacity);
460
(size_t)plaintext_length,
461
plaintext_capacity);
344
462
if(plaintext_capacity == 0){
345
perror("incbuffer");
346
plaintext_length = -1;
347
goto decrypt_end;
463
perror_plus("incbuffer");
464
plaintext_length = -1;
465
goto decrypt_end;
348
466
}
349
467
350
468
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
355
473
break;
356
474
}
357
475
if(ret < 0){
358
perror("gpgme_data_read");
476
perror_plus("gpgme_data_read");
359
477
plaintext_length = -1;
360
478
goto decrypt_end;
361
479
}
363
481
}
364
482
365
483
if(debug){
366
fprintf(stderr, "Decrypted password is: ");
484
fprintf_plus(stderr, "Decrypted password is: ");
367
485
for(ssize_t i = 0; i < plaintext_length; i++){
368
486
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
369
487
}
380
498
return plaintext_length;
381
499
}
382
500
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
387
ret = "(unknown)";
388
return ret;
501
__attribute__((warn_unused_result, const))
502
static const char *safe_string(const char *str){
503
if(str == NULL)
504
return "(unknown)";
505
return str;
506
}
507
508
__attribute__((warn_unused_result))
509
static const char *safer_gnutls_strerror(int value){
510
const char *ret = gnutls_strerror(value);
511
return safe_string(ret);
389
512
}
390
513
391
514
/* GnuTLS log function callback */
515
__attribute__((nonnull))
392
516
static void debuggnutls(__attribute__((unused)) int level,
393
517
const char* string){
394
fprintf(stderr, "GnuTLS: %s", string);
518
fprintf_plus(stderr, "GnuTLS: %s", string);
395
519
}
396
520
521
__attribute__((nonnull(1, 2, 4), warn_unused_result))
397
522
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
523
const char *seckeyfilename,
524
const char *dhparamsfilename,
525
mandos_context *mc){
399
526
int ret;
527
unsigned int uret;
400
528
401
529
if(debug){
402
fprintf(stderr, "Initializing GnuTLS\n");
403
}
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
409
return -1;
530
fprintf_plus(stderr, "Initializing GnuTLS\n");
410
531
}
411
532
412
533
if(debug){
418
539
}
419
540
420
541
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
422
543
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
429
546
return -1;
430
547
}
431
548
432
549
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
552
pubkeyfilename,
553
seckeyfilename);
436
554
}
437
555
438
556
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
557
(mc->cred, pubkeyfilename, seckeyfilename,
440
558
GNUTLS_OPENPGP_FMT_BASE64);
441
559
if(ret != GNUTLS_E_SUCCESS){
442
fprintf(stderr,
443
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
446
safer_gnutls_strerror(ret));
560
fprintf_plus(stderr,
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
447
565
goto globalfail;
448
566
}
449
567
450
568
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
574
goto globalfail;
575
}
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
do {
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
581
if(dhpfile == -1){
582
perror_plus("open");
583
dhparamsfilename = NULL;
584
break;
585
}
586
size_t params_capacity = 0;
587
while(true){
588
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params.size,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
593
free(params.data);
594
params.data = NULL;
595
dhparamsfilename = NULL;
596
break;
597
}
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
600
BUFFER_SIZE);
601
/* EOF */
602
if(bytes_read == 0){
603
break;
604
}
605
/* check bytes_read for failure */
606
if(bytes_read < 0){
607
perror_plus("read");
608
free(params.data);
609
params.data = NULL;
610
dhparamsfilename = NULL;
611
break;
612
}
613
params.size += (unsigned int)bytes_read;
614
}
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
617
}
618
if(dhparamsfilename == NULL){
619
break;
620
}
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
628
}
629
free(params.data);
630
} while(false);
631
}
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
do {
638
int secfile = open(seckeyfilename, O_RDONLY);
639
if(secfile == -1){
640
perror_plus("open");
641
break;
642
}
643
size_t buffer_capacity = 0;
644
while(true){
645
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer.size,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
650
free(buffer.data);
651
buffer.data = NULL;
652
break;
653
}
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
656
BUFFER_SIZE);
657
/* EOF */
658
if(bytes_read == 0){
659
break;
660
}
661
/* check bytes_read for failure */
662
if(bytes_read < 0){
663
perror_plus("read");
664
free(buffer.data);
665
buffer.data = NULL;
666
break;
667
}
668
buffer.size += (unsigned int)bytes_read;
669
}
670
close(secfile);
671
} while(false);
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
675
{
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
" structure: %s",
681
safer_gnutls_strerror(ret));
682
free(buffer.data);
683
buffer.data = NULL;
684
} else {
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
690
privkey = NULL;
691
}
692
free(buffer.data);
693
buffer.data = NULL;
694
if(privkey != NULL){
695
/* Use private key to suggest an appropriate
696
sec_param */
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
699
if(debug){
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
703
(sec_param)));
704
}
705
}
706
}
707
}
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
if(debug){
712
fprintf_plus(stderr, "Falling back to security parameter"
713
" \"%s\"\n",
714
safe_string(gnutls_sec_param_get_name
715
(sec_param)));
716
}
717
}
718
}
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
720
if(uret != 0){
721
mc->dh_bits = uret;
722
if(debug){
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
726
(sec_param)),
727
mc->dh_bits);
728
}
729
} else {
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
733
(sec_param)),
734
safer_gnutls_strerror(ret));
735
goto globalfail;
736
}
737
} else if(debug){
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
mc->dh_bits);
740
}
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
746
goto globalfail;
747
}
748
}
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
750
466
751
return 0;
467
752
468
753
globalfail:
469
754
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
473
757
return -1;
474
758
}
475
759
476
static int init_gnutls_session(gnutls_session_t *session){
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
762
mandos_context *mc){
477
763
int ret;
478
764
/* GnuTLS session creation */
479
ret = gnutls_init(session, GNUTLS_SERVER);
765
do {
766
ret = gnutls_init(session, GNUTLS_SERVER);
767
if(quit_now){
768
return -1;
769
}
770
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
771
if(ret != GNUTLS_E_SUCCESS){
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
safer_gnutls_strerror(ret));
772
fprintf_plus(stderr,
773
"Error in GnuTLS session initialization: %s\n",
774
safer_gnutls_strerror(ret));
483
775
}
484
776
485
777
{
486
778
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
779
do {
780
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
781
if(quit_now){
782
gnutls_deinit(*session);
783
return -1;
784
}
785
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
786
if(ret != GNUTLS_E_SUCCESS){
489
fprintf(stderr, "Syntax error at: %s\n", err);
490
fprintf(stderr, "GnuTLS error: %s\n",
491
safer_gnutls_strerror(ret));
787
fprintf_plus(stderr, "Syntax error at: %s\n", err);
788
fprintf_plus(stderr, "GnuTLS error: %s\n",
789
safer_gnutls_strerror(ret));
492
790
gnutls_deinit(*session);
493
791
return -1;
494
792
}
495
793
}
496
794
497
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
795
do {
796
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
797
mc->cred);
798
if(quit_now){
799
gnutls_deinit(*session);
800
return -1;
801
}
802
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
499
803
if(ret != GNUTLS_E_SUCCESS){
500
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
safer_gnutls_strerror(ret));
804
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
805
safer_gnutls_strerror(ret));
502
806
gnutls_deinit(*session);
503
807
return -1;
504
808
}
505
809
506
810
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
509
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
811
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
511
812
512
813
return 0;
513
814
}
516
817
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
517
818
__attribute__((unused)) const char *txt){}
518
819
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
824
int ret = 0;
825
if(seteuid(0) == -1){
826
ret = errno;
827
}
828
errno = old_errno;
829
return ret;
830
}
831
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
837
if(ret != 0){
838
errno = old_errno;
839
return ret;
840
}
841
if(setuid(0) == -1){
842
ret = errno;
843
}
844
errno = old_errno;
845
return ret;
846
}
847
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
852
int ret = 0;
853
if(seteuid(uid) == -1){
854
ret = errno;
855
}
856
errno = old_errno;
857
return ret;
858
}
859
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
864
int ret = 0;
865
if(setuid(uid) == -1){
866
ret = errno;
867
}
868
errno = old_errno;
869
return ret;
870
}
871
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
875
const char *address,
876
AvahiIfIndex if_index){
877
int ret;
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
884
if(debug){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
887
}
888
return false;
889
}
890
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
894
return false;
895
}
896
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
if(devnull == -1){
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
900
return false;
901
}
902
pid_t pid = fork();
903
if(pid == 0){
904
/* Child */
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
907
if(errno != 0){
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
910
} else {
911
/* Set group */
912
errno = 0;
913
ret = setgid(0);
914
if(ret == -1){
915
perror_plus("setgid");
916
_exit(EX_NOPERM);
917
}
918
/* Reset supplementary groups */
919
errno = 0;
920
ret = setgroups(0, NULL);
921
if(ret == -1){
922
perror_plus("setgroups");
923
_exit(EX_NOPERM);
924
}
925
}
926
ret = dup2(devnull, STDIN_FILENO);
927
if(ret == -1){
928
perror_plus("dup2(devnull, STDIN_FILENO)");
929
_exit(EX_OSERR);
930
}
931
ret = close(devnull);
932
if(ret == -1){
933
perror_plus("close");
934
_exit(EX_OSERR);
935
}
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
if(ret == -1){
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
_exit(EX_OSERR);
940
}
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
942
O_RDONLY
943
| O_DIRECTORY
944
| O_PATH
945
| O_CLOEXEC));
946
if(helperdir_fd == -1){
947
perror_plus("open");
948
_exit(EX_UNAVAILABLE);
949
}
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
helper, O_RDONLY));
952
if(helper_fd == -1){
953
perror_plus("openat");
954
close(helperdir_fd);
955
_exit(EX_UNAVAILABLE);
956
}
957
close(helperdir_fd);
958
#ifdef __GNUC__
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
961
#endif
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
965
environ) == -1){
966
#ifdef __GNUC__
967
#pragma GCC diagnostic pop
968
#endif
969
perror_plus("fexecve");
970
_exit(EXIT_FAILURE);
971
}
972
}
973
if(pid == -1){
974
perror_plus("fork");
975
return false;
976
}
977
int status;
978
pid_t pret = -1;
979
errno = 0;
980
do {
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
988
}
989
if(kill(pid, SIGTERM) == -1){
990
perror_plus("kill");
991
}
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
994
" helper program");
995
}
996
return false;
997
}
998
} while(pret == -1 and errno == EINTR);
999
if(pret == -1){
1000
perror_plus("waitpid");
1001
return false;
1002
}
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1007
return false;
1008
}
1009
return true;
1010
}
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1014
return false;
1015
}
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1017
return false;
1018
}
1019
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1023
if(debug){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
}
1026
return add_delete_local_route(true, address, if_index);
1027
}
1028
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1032
if(debug){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
}
1035
return add_delete_local_route(false, address, if_index);
1036
}
1037
519
1038
/* Called when a Mandos server is found */
520
static int start_mandos_communication(const char *ip, uint16_t port,
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
521
1041
AvahiIfIndex if_index,
522
int af){
523
int ret, tcp_sd;
1042
int af, mandos_context *mc){
1043
int ret, tcp_sd = -1;
524
1044
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
1045
struct sockaddr_storage to;
529
1046
char *buffer = NULL;
530
char *decrypted_buffer;
1047
char *decrypted_buffer = NULL;
531
1048
size_t buffer_length = 0;
532
1049
size_t buffer_capacity = 0;
533
ssize_t decrypted_buffer_size;
534
1050
size_t written;
535
int retval = 0;
1051
int retval = -1;
536
1052
gnutls_session_t session;
537
1053
int pf; /* Protocol family */
1054
bool route_added = false;
1055
1056
errno = 0;
1057
1058
if(quit_now){
1059
errno = EINTR;
1060
return -1;
1061
}
538
1062
539
1063
switch(af){
540
1064
case AF_INET6:
544
1068
pf = PF_INET;
545
1069
break;
546
1070
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
1071
fprintf_plus(stderr, "Bad address family: %d\n", af);
1072
errno = EINVAL;
548
1073
return -1;
549
1074
}
550
1075
551
ret = init_gnutls_session(&session);
1076
/* If the interface is specified and we have a list of interfaces */
1077
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1078
/* Check if the interface is one of the interfaces we are using */
1079
bool match = false;
1080
{
1081
char *interface = NULL;
1082
while((interface = argz_next(mc->interfaces,
1083
mc->interfaces_size,
1084
interface))){
1085
if(if_nametoindex(interface) == (unsigned int)if_index){
1086
match = true;
1087
break;
1088
}
1089
}
1090
}
1091
if(not match){
1092
/* This interface does not match any in the list, so we don't
1093
connect to the server */
1094
if(debug){
1095
char interface[IF_NAMESIZE];
1096
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1097
perror_plus("if_indextoname");
1098
} else {
1099
fprintf_plus(stderr, "Skipping server on non-used interface"
1100
" \"%s\"\n",
1101
if_indextoname((unsigned int)if_index,
1102
interface));
1103
}
1104
}
1105
return -1;
1106
}
1107
}
1108
1109
ret = init_gnutls_session(&session, mc);
552
1110
if(ret != 0){
553
1111
return -1;
554
1112
}
555
1113
556
1114
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
1115
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1116
PRIuMAX "\n", ip, (uintmax_t)port);
559
1117
}
560
1118
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
1119
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
562
1120
if(tcp_sd < 0){
563
perror("socket");
564
return -1;
565
}
566
567
memset(&to, 0, sizeof(to));
1121
int e = errno;
1122
perror_plus("socket");
1123
errno = e;
1124
goto mandos_end;
1125
}
1126
1127
if(quit_now){
1128
errno = EINTR;
1129
goto mandos_end;
1130
}
1131
568
1132
if(af == AF_INET6){
569
to.in6.sin6_family = (uint16_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1133
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1134
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1135
ret = inet_pton(af, ip, &to6->sin6_addr);
571
1136
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
1137
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1138
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1139
ret = inet_pton(af, ip, &to4->sin_addr);
574
1140
}
575
1141
if(ret < 0 ){
576
perror("inet_pton");
577
return -1;
1142
int e = errno;
1143
perror_plus("inet_pton");
1144
errno = e;
1145
goto mandos_end;
578
1146
}
579
1147
if(ret == 0){
580
fprintf(stderr, "Bad address: %s\n", ip);
581
return -1;
1148
int e = errno;
1149
fprintf_plus(stderr, "Bad address: %s\n", ip);
1150
errno = e;
1151
goto mandos_end;
582
1152
}
583
1153
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
1154
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1155
if(IN6_IS_ADDR_LINKLOCAL
1156
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
591
1157
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
1158
fprintf_plus(stderr, "An IPv6 link-local address is"
1159
" incomplete without a network interface\n");
1160
errno = EINVAL;
1161
goto mandos_end;
595
1162
}
596
1163
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
598
1165
}
599
1166
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
1167
((struct sockaddr_in *)&to)->sin_port = htons(port);
1168
}
1169
1170
if(quit_now){
1171
errno = EINTR;
1172
goto mandos_end;
603
1173
}
604
1174
605
1175
if(debug){
606
1176
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
1177
char interface[IF_NAMESIZE];
608
1178
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
1179
perror_plus("if_indextoname");
610
1180
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
613
1183
}
614
1184
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
617
1187
}
618
1188
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
1189
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
if(pcret == NULL){
629
perror("inet_ntop");
630
} else {
631
if(strcmp(addrstr, ip) != 0){
632
fprintf(stderr, "Canonical address form: %s\n", addrstr);
633
}
634
}
635
}
636
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
643
perror("connect");
644
return -1;
1190
if(af == AF_INET6){
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1194
NI_NUMERICHOST);
1195
} else {
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1199
NI_NUMERICHOST);
1200
}
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1207
}
1208
}
1209
1210
if(quit_now){
1211
errno = EINTR;
1212
goto mandos_end;
1213
}
1214
1215
while(true){
1216
if(af == AF_INET6){
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1219
} else {
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1222
}
1223
if(ret < 0){
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1230
&to)->sin6_addr)))
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1241
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1245
*/
1246
if(debug){
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
" direct route\n");
1249
}
1250
int e = errno;
1251
route_added = add_local_route(ip, if_index);
1252
if(route_added){
1253
continue;
1254
}
1255
errno = e;
1256
}
1257
if(errno != ECONNREFUSED or debug){
1258
int e = errno;
1259
perror_plus("connect");
1260
errno = e;
1261
}
1262
goto mandos_end;
1263
}
1264
1265
if(quit_now){
1266
errno = EINTR;
1267
goto mandos_end;
1268
}
1269
break;
645
1270
}
646
1271
647
1272
const char *out = mandos_protocol_version;
649
1274
while(true){
650
1275
size_t out_size = strlen(out);
651
1276
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
out_size - written));
1277
out_size - written));
653
1278
if(ret == -1){
654
perror("write");
655
retval = -1;
1279
int e = errno;
1280
perror_plus("write");
1281
errno = e;
656
1282
goto mandos_end;
657
1283
}
658
1284
written += (size_t)ret;
666
1292
break;
667
1293
}
668
1294
}
1295
1296
if(quit_now){
1297
errno = EINTR;
1298
goto mandos_end;
1299
}
669
1300
}
670
1301
671
1302
if(debug){
672
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
}
674
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
1303
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1304
}
1305
1306
if(quit_now){
1307
errno = EINTR;
1308
goto mandos_end;
1309
}
1310
1311
/* This casting via intptr_t is to eliminate warning about casting
1312
an int to a pointer type. This is exactly how the GnuTLS Guile
1313
function "set-session-transport-fd!" does it. */
1314
gnutls_transport_set_ptr(session,
1315
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1316
1317
if(quit_now){
1318
errno = EINTR;
1319
goto mandos_end;
1320
}
1321
1322
do {
678
1323
ret = gnutls_handshake(session);
1324
if(quit_now){
1325
errno = EINTR;
1326
goto mandos_end;
1327
}
679
1328
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
1329
681
1330
if(ret != GNUTLS_E_SUCCESS){
682
1331
if(debug){
683
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1332
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
684
1333
gnutls_perror(ret);
685
1334
}
686
retval = -1;
1335
errno = EPROTO;
687
1336
goto mandos_end;
688
1337
}
689
1338
690
1339
/* Read OpenPGP packet that contains the wanted password */
691
1340
692
1341
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
694
ip);
1342
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1343
" %s\n", ip);
695
1344
}
696
1345
697
1346
while(true){
1347
1348
if(quit_now){
1349
errno = EINTR;
1350
goto mandos_end;
1351
}
1352
698
1353
buffer_capacity = incbuffer(&buffer, buffer_length,
699
buffer_capacity);
1354
buffer_capacity);
700
1355
if(buffer_capacity == 0){
701
perror("incbuffer");
702
retval = -1;
1356
int e = errno;
1357
perror_plus("incbuffer");
1358
errno = e;
1359
goto mandos_end;
1360
}
1361
1362
if(quit_now){
1363
errno = EINTR;
703
1364
goto mandos_end;
704
1365
}
705
1366
714
1375
case GNUTLS_E_AGAIN:
715
1376
break;
716
1377
case GNUTLS_E_REHANDSHAKE:
717
do{
1378
do {
718
1379
ret = gnutls_handshake(session);
1380
1381
if(quit_now){
1382
errno = EINTR;
1383
goto mandos_end;
1384
}
719
1385
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
1386
if(ret < 0){
721
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1387
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1388
"***\n");
722
1389
gnutls_perror(ret);
723
retval = -1;
1390
errno = EPROTO;
724
1391
goto mandos_end;
725
1392
}
726
1393
break;
727
1394
default:
728
fprintf(stderr, "Unknown error while reading data from"
729
" encrypted session with Mandos server\n");
730
retval = -1;
1395
fprintf_plus(stderr, "Unknown error while reading data from"
1396
" encrypted session with Mandos server\n");
731
1397
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1398
errno = EIO;
732
1399
goto mandos_end;
733
1400
}
734
1401
} else {
737
1404
}
738
1405
739
1406
if(debug){
740
fprintf(stderr, "Closing TLS session\n");
741
}
742
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1407
fprintf_plus(stderr, "Closing TLS session\n");
1408
}
1409
1410
if(quit_now){
1411
errno = EINTR;
1412
goto mandos_end;
1413
}
1414
1415
do {
1416
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1417
if(quit_now){
1418
errno = EINTR;
1419
goto mandos_end;
1420
}
1421
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
744
1422
745
1423
if(buffer_length > 0){
746
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
buffer_length,
748
&decrypted_buffer);
1424
ssize_t decrypted_buffer_size;
1425
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1426
&decrypted_buffer, mc);
749
1427
if(decrypted_buffer_size >= 0){
1428
1429
clearerr(stdout);
750
1430
written = 0;
751
1431
while(written < (size_t) decrypted_buffer_size){
1432
if(quit_now){
1433
errno = EINTR;
1434
goto mandos_end;
1435
}
1436
752
1437
ret = (int)fwrite(decrypted_buffer + written, 1,
753
1438
(size_t)decrypted_buffer_size - written,
754
1439
stdout);
755
1440
if(ret == 0 and ferror(stdout)){
1441
int e = errno;
756
1442
if(debug){
757
fprintf(stderr, "Error writing encrypted data: %s\n",
758
strerror(errno));
1443
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1444
strerror(errno));
759
1445
}
760
retval = -1;
761
break;
1446
errno = e;
1447
goto mandos_end;
762
1448
}
763
1449
written += (size_t)ret;
764
1450
}
765
free(decrypted_buffer);
766
} else {
767
retval = -1;
1451
ret = fflush(stdout);
1452
if(ret != 0){
1453
int e = errno;
1454
if(debug){
1455
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1456
strerror(errno));
1457
}
1458
errno = e;
1459
goto mandos_end;
1460
}
1461
retval = 0;
768
1462
}
769
} else {
770
retval = -1;
771
1463
}
772
1464
773
1465
/* Shutdown procedure */
774
1466
775
1467
mandos_end:
776
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
1468
{
1469
if(route_added){
1470
if(not delete_local_route(ip, if_index)){
1471
fprintf_plus(stderr, "Failed to delete local route to %s on"
1472
" interface %d", ip, if_index);
1473
}
1474
}
1475
int e = errno;
1476
free(decrypted_buffer);
1477
free(buffer);
1478
if(tcp_sd >= 0){
1479
ret = close(tcp_sd);
1480
}
1481
if(ret == -1){
1482
if(e == 0){
1483
e = errno;
1484
}
1485
perror_plus("close");
1486
}
1487
gnutls_deinit(session);
1488
errno = e;
1489
if(quit_now){
1490
errno = EINTR;
1491
retval = -1;
1492
}
780
1493
}
781
gnutls_deinit(session);
782
1494
return retval;
783
1495
}
784
1496
795
1507
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
1508
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
1509
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
1510
void *mc){
1511
if(r == NULL){
1512
return;
1513
}
800
1514
801
1515
/* Called whenever a service has been resolved successfully or
802
1516
timed out */
803
1517
1518
if(quit_now){
1519
avahi_s_service_resolver_free(r);
1520
return;
1521
}
1522
804
1523
switch(event){
805
1524
default:
806
1525
case AVAHI_RESOLVER_FAILURE:
807
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
1526
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1527
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1528
domain,
1529
avahi_strerror(avahi_server_errno
1530
(((mandos_context*)mc)->server)));
810
1531
break;
811
1532
812
1533
case AVAHI_RESOLVER_FOUND:
814
1535
char ip[AVAHI_ADDRESS_STR_MAX];
815
1536
avahi_address_snprint(ip, sizeof(ip), address);
816
1537
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
1538
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1539
PRIdMAX ") on port %" PRIu16 "\n", name,
1540
host_name, ip, (intmax_t)interface, port);
820
1541
}
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
1542
int ret = start_mandos_communication(ip, (in_port_t)port,
1543
interface,
1544
avahi_proto_to_af(proto),
1545
mc);
823
1546
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
1547
avahi_simple_poll_quit(simple_poll);
1548
} else {
1549
if(not add_server(ip, (in_port_t)port, interface,
1550
avahi_proto_to_af(proto),
1551
&((mandos_context*)mc)->current_server)){
1552
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1553
" list\n", name);
1554
}
825
1555
}
826
1556
}
827
1557
}
837
1567
const char *domain,
838
1568
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
1569
flags,
840
AVAHI_GCC_UNUSED void* userdata){
841
assert(b);
1570
void *mc){
1571
if(b == NULL){
1572
return;
1573
}
842
1574
843
1575
/* Called whenever a new services becomes available on the LAN or
844
1576
is removed from the LAN */
845
1577
1578
if(quit_now){
1579
return;
1580
}
1581
846
1582
switch(event){
847
1583
default:
848
1584
case AVAHI_BROWSER_FAILURE:
849
1585
850
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
1586
fprintf_plus(stderr, "(Avahi browser) %s\n",
1587
avahi_strerror(avahi_server_errno
1588
(((mandos_context*)mc)->server)));
1589
avahi_simple_poll_quit(simple_poll);
853
1590
return;
854
1591
855
1592
case AVAHI_BROWSER_NEW:
858
1595
the callback function is called the Avahi server will free the
859
1596
resolver for us. */
860
1597
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
864
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
1598
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1599
interface, protocol, name, type,
1600
domain, protocol, 0,
1601
resolve_callback, mc) == NULL)
1602
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1603
" %s\n", name,
1604
avahi_strerror(avahi_server_errno
1605
(((mandos_context*)mc)->server)));
866
1606
break;
867
1607
868
1608
case AVAHI_BROWSER_REMOVE:
871
1611
case AVAHI_BROWSER_ALL_FOR_NOW:
872
1612
case AVAHI_BROWSER_CACHE_EXHAUSTED:
873
1613
if(debug){
874
fprintf(stderr, "No Mandos server found, still searching...\n");
1614
fprintf_plus(stderr, "No Mandos server found, still"
1615
" searching...\n");
875
1616
}
876
1617
break;
877
1618
}
878
1619
}
879
1620
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
1621
/* Signal handler that stops main loop after SIGTERM */
1622
static void handle_sigterm(int sig){
884
1623
if(quit_now){
885
1624
return;
886
1625
}
887
1626
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
1627
signal_received = sig;
1628
int old_errno = errno;
1629
/* set main loop to exit */
1630
if(simple_poll != NULL){
1631
avahi_simple_poll_quit(simple_poll);
1632
}
1633
errno = old_errno;
1634
}
1635
1636
__attribute__((nonnull, warn_unused_result))
1637
bool get_flags(const char *ifname, struct ifreq *ifr){
1638
int ret;
1639
int old_errno;
1640
1641
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1642
if(s < 0){
1643
old_errno = errno;
1644
perror_plus("socket");
1645
errno = old_errno;
1646
return false;
1647
}
1648
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1649
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1650
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1651
if(ret == -1){
1652
if(debug){
1653
old_errno = errno;
1654
perror_plus("ioctl SIOCGIFFLAGS");
1655
errno = old_errno;
1656
}
1657
return false;
1658
}
1659
return true;
1660
}
1661
1662
__attribute__((nonnull, warn_unused_result))
1663
bool good_flags(const char *ifname, const struct ifreq *ifr){
1664
1665
/* Reject the loopback device */
1666
if(ifr->ifr_flags & IFF_LOOPBACK){
1667
if(debug){
1668
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1669
ifname);
1670
}
1671
return false;
1672
}
1673
/* Accept point-to-point devices only if connect_to is specified */
1674
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1675
if(debug){
1676
fprintf_plus(stderr, "Accepting point-to-point interface"
1677
" \"%s\"\n", ifname);
1678
}
1679
return true;
1680
}
1681
/* Otherwise, reject non-broadcast-capable devices */
1682
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1683
if(debug){
1684
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1685
" \"%s\"\n", ifname);
1686
}
1687
return false;
1688
}
1689
/* Reject non-ARP interfaces (including dummy interfaces) */
1690
if(ifr->ifr_flags & IFF_NOARP){
1691
if(debug){
1692
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1693
ifname);
1694
}
1695
return false;
1696
}
1697
1698
/* Accept this device */
1699
if(debug){
1700
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1701
}
1702
return true;
1703
}
1704
1705
/*
1706
* This function determines if a directory entry in /sys/class/net
1707
* corresponds to an acceptable network device.
1708
* (This function is passed to scandir(3) as a filter function.)
1709
*/
1710
__attribute__((nonnull, warn_unused_result))
1711
int good_interface(const struct dirent *if_entry){
1712
if(if_entry->d_name[0] == '.'){
1713
return 0;
1714
}
1715
1716
struct ifreq ifr;
1717
if(not get_flags(if_entry->d_name, &ifr)){
1718
if(debug){
1719
fprintf_plus(stderr, "Failed to get flags for interface "
1720
"\"%s\"\n", if_entry->d_name);
1721
}
1722
return 0;
1723
}
1724
1725
if(not good_flags(if_entry->d_name, &ifr)){
1726
return 0;
1727
}
1728
return 1;
1729
}
1730
1731
/*
1732
* This function determines if a network interface is up.
1733
*/
1734
__attribute__((nonnull, warn_unused_result))
1735
bool interface_is_up(const char *interface){
1736
struct ifreq ifr;
1737
if(not get_flags(interface, &ifr)){
1738
if(debug){
1739
fprintf_plus(stderr, "Failed to get flags for interface "
1740
"\"%s\"\n", interface);
1741
}
1742
return false;
1743
}
1744
1745
return (bool)(ifr.ifr_flags & IFF_UP);
1746
}
1747
1748
/*
1749
* This function determines if a network interface is running
1750
*/
1751
__attribute__((nonnull, warn_unused_result))
1752
bool interface_is_running(const char *interface){
1753
struct ifreq ifr;
1754
if(not get_flags(interface, &ifr)){
1755
if(debug){
1756
fprintf_plus(stderr, "Failed to get flags for interface "
1757
"\"%s\"\n", interface);
1758
}
1759
return false;
1760
}
1761
1762
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1763
}
1764
1765
__attribute__((nonnull, pure, warn_unused_result))
1766
int notdotentries(const struct dirent *direntry){
1767
/* Skip "." and ".." */
1768
if(direntry->d_name[0] == '.'
1769
and (direntry->d_name[1] == '\0'
1770
or (direntry->d_name[1] == '.'
1771
and direntry->d_name[2] == '\0'))){
1772
return 0;
1773
}
1774
return 1;
1775
}
1776
1777
/* Is this directory entry a runnable program? */
1778
__attribute__((nonnull, warn_unused_result))
1779
int runnable_hook(const struct dirent *direntry){
1780
int ret;
1781
size_t sret;
1782
struct stat st;
1783
1784
if((direntry->d_name)[0] == '\0'){
1785
/* Empty name? */
1786
return 0;
1787
}
1788
1789
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1790
"abcdefghijklmnopqrstuvwxyz"
1791
"0123456789"
1792
"_.-");
1793
if((direntry->d_name)[sret] != '\0'){
1794
/* Contains non-allowed characters */
1795
if(debug){
1796
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1797
direntry->d_name);
1798
}
1799
return 0;
1800
}
1801
1802
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1803
if(ret == -1){
1804
if(debug){
1805
perror_plus("Could not stat hook");
1806
}
1807
return 0;
1808
}
1809
if(not (S_ISREG(st.st_mode))){
1810
/* Not a regular file */
1811
if(debug){
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1813
direntry->d_name);
1814
}
1815
return 0;
1816
}
1817
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1818
/* Not executable */
1819
if(debug){
1820
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1821
direntry->d_name);
1822
}
1823
return 0;
1824
}
1825
if(debug){
1826
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1827
direntry->d_name);
1828
}
1829
return 1;
1830
}
1831
1832
__attribute__((nonnull, warn_unused_result))
1833
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1834
mandos_context *mc){
1835
int ret;
1836
struct timespec now;
1837
struct timespec waited_time;
1838
intmax_t block_time;
1839
1840
while(true){
1841
if(mc->current_server == NULL){
1842
if(debug){
1843
fprintf_plus(stderr, "Wait until first server is found."
1844
" No timeout!\n");
1845
}
1846
ret = avahi_simple_poll_iterate(s, -1);
1847
} else {
1848
if(debug){
1849
fprintf_plus(stderr, "Check current_server if we should run"
1850
" it, or wait\n");
1851
}
1852
/* the current time */
1853
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1854
if(ret == -1){
1855
perror_plus("clock_gettime");
1856
return -1;
1857
}
1858
/* Calculating in ms how long time between now and server
1859
who we visted longest time ago. Now - last seen. */
1860
waited_time.tv_sec = (now.tv_sec
1861
- mc->current_server->last_seen.tv_sec);
1862
waited_time.tv_nsec = (now.tv_nsec
1863
- mc->current_server->last_seen.tv_nsec);
1864
/* total time is 10s/10,000ms.
1865
Converting to s from ms by dividing by 1,000,
1866
and ns to ms by dividing by 1,000,000. */
1867
block_time = ((retry_interval
1868
- ((intmax_t)waited_time.tv_sec * 1000))
1869
- ((intmax_t)waited_time.tv_nsec / 1000000));
1870
1871
if(debug){
1872
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1873
block_time);
1874
}
1875
1876
if(block_time <= 0){
1877
ret = start_mandos_communication(mc->current_server->ip,
1878
mc->current_server->port,
1879
mc->current_server->if_index,
1880
mc->current_server->af, mc);
1881
if(ret == 0){
1882
avahi_simple_poll_quit(s);
1883
return 0;
1884
}
1885
ret = clock_gettime(CLOCK_MONOTONIC,
1886
&mc->current_server->last_seen);
1887
if(ret == -1){
1888
perror_plus("clock_gettime");
1889
return -1;
1890
}
1891
mc->current_server = mc->current_server->next;
1892
block_time = 0; /* Call avahi to find new Mandos
1893
servers, but don't block */
1894
}
1895
1896
ret = avahi_simple_poll_iterate(s, (int)block_time);
1897
}
1898
if(ret != 0){
1899
if(ret > 0 or errno != EINTR){
1900
return (ret != 1) ? ret : 0;
1901
}
1902
}
1903
}
1904
}
1905
1906
__attribute__((nonnull))
1907
void run_network_hooks(const char *mode, const char *interface,
1908
const float delay){
1909
struct dirent **direntries = NULL;
1910
if(hookdir_fd == -1){
1911
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
| O_CLOEXEC);
1913
if(hookdir_fd == -1){
1914
if(errno == ENOENT){
1915
if(debug){
1916
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1917
" found\n", hookdir);
1918
}
1919
} else {
1920
perror_plus("open");
1921
}
1922
return;
1923
}
1924
}
1925
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1926
runnable_hook, alphasort);
1927
if(numhooks == -1){
1928
perror_plus("scandir");
1929
return;
1930
}
1931
struct dirent *direntry;
1932
int ret;
1933
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
if(devnull == -1){
1935
perror_plus("open(\"/dev/null\", O_RDONLY)");
1936
return;
1937
}
1938
for(int i = 0; i < numhooks; i++){
1939
direntry = direntries[i];
1940
if(debug){
1941
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1942
direntry->d_name);
1943
}
1944
pid_t hook_pid = fork();
1945
if(hook_pid == 0){
1946
/* Child */
1947
/* Raise privileges */
1948
errno = raise_privileges_permanently();
1949
if(errno != 0){
1950
perror_plus("Failed to raise privileges");
1951
_exit(EX_NOPERM);
1952
}
1953
/* Set group */
1954
errno = 0;
1955
ret = setgid(0);
1956
if(ret == -1){
1957
perror_plus("setgid");
1958
_exit(EX_NOPERM);
1959
}
1960
/* Reset supplementary groups */
1961
errno = 0;
1962
ret = setgroups(0, NULL);
1963
if(ret == -1){
1964
perror_plus("setgroups");
1965
_exit(EX_NOPERM);
1966
}
1967
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
if(ret == -1){
1969
perror_plus("setenv");
1970
_exit(EX_OSERR);
1971
}
1972
ret = setenv("DEVICE", interface, 1);
1973
if(ret == -1){
1974
perror_plus("setenv");
1975
_exit(EX_OSERR);
1976
}
1977
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
if(ret == -1){
1979
perror_plus("setenv");
1980
_exit(EX_OSERR);
1981
}
1982
ret = setenv("MODE", mode, 1);
1983
if(ret == -1){
1984
perror_plus("setenv");
1985
_exit(EX_OSERR);
1986
}
1987
char *delaystring;
1988
ret = asprintf(&delaystring, "%f", (double)delay);
1989
if(ret == -1){
1990
perror_plus("asprintf");
1991
_exit(EX_OSERR);
1992
}
1993
ret = setenv("DELAY", delaystring, 1);
1994
if(ret == -1){
1995
free(delaystring);
1996
perror_plus("setenv");
1997
_exit(EX_OSERR);
1998
}
1999
free(delaystring);
2000
if(connect_to != NULL){
2001
ret = setenv("CONNECT", connect_to, 1);
2002
if(ret == -1){
2003
perror_plus("setenv");
2004
_exit(EX_OSERR);
2005
}
2006
}
2007
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2008
direntry->d_name,
2009
O_RDONLY));
2010
if(hook_fd == -1){
2011
perror_plus("openat");
2012
_exit(EXIT_FAILURE);
2013
}
2014
if(close(hookdir_fd) == -1){
2015
perror_plus("close");
2016
_exit(EXIT_FAILURE);
2017
}
2018
ret = dup2(devnull, STDIN_FILENO);
2019
if(ret == -1){
2020
perror_plus("dup2(devnull, STDIN_FILENO)");
2021
_exit(EX_OSERR);
2022
}
2023
ret = close(devnull);
2024
if(ret == -1){
2025
perror_plus("close");
2026
_exit(EX_OSERR);
2027
}
2028
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
if(ret == -1){
2030
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2031
_exit(EX_OSERR);
2032
}
2033
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
environ) == -1){
2035
perror_plus("fexecve");
2036
_exit(EXIT_FAILURE);
2037
}
2038
} else {
2039
if(hook_pid == -1){
2040
perror_plus("fork");
2041
free(direntry);
2042
continue;
2043
}
2044
int status;
2045
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2046
perror_plus("waitpid");
2047
free(direntry);
2048
continue;
2049
}
2050
if(WIFEXITED(status)){
2051
if(WEXITSTATUS(status) != 0){
2052
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2053
" with status %d\n", direntry->d_name,
2054
WEXITSTATUS(status));
2055
free(direntry);
2056
continue;
2057
}
2058
} else if(WIFSIGNALED(status)){
2059
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2060
" signal %d\n", direntry->d_name,
2061
WTERMSIG(status));
2062
free(direntry);
2063
continue;
2064
} else {
2065
fprintf_plus(stderr, "Warning: network hook \"%s\""
2066
" crashed\n", direntry->d_name);
2067
free(direntry);
2068
continue;
2069
}
2070
}
2071
if(debug){
2072
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2073
direntry->d_name);
2074
}
2075
free(direntry);
2076
}
2077
free(direntries);
2078
if(close(hookdir_fd) == -1){
2079
perror_plus("close");
2080
} else {
2081
hookdir_fd = -1;
2082
}
2083
close(devnull);
2084
}
2085
2086
__attribute__((nonnull, warn_unused_result))
2087
int bring_up_interface(const char *const interface,
2088
const float delay){
2089
int old_errno = errno;
2090
int ret;
2091
struct ifreq network;
2092
unsigned int if_index = if_nametoindex(interface);
2093
if(if_index == 0){
2094
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2095
errno = old_errno;
2096
return ENXIO;
2097
}
2098
2099
if(quit_now){
2100
errno = old_errno;
2101
return EINTR;
2102
}
2103
2104
if(not interface_is_up(interface)){
2105
int ret_errno = 0;
2106
int ioctl_errno = 0;
2107
if(not get_flags(interface, &network)){
2108
ret_errno = errno;
2109
fprintf_plus(stderr, "Failed to get flags for interface "
2110
"\"%s\"\n", interface);
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
network.ifr_flags |= IFF_UP; /* set flag */
2115
2116
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2117
if(sd == -1){
2118
ret_errno = errno;
2119
perror_plus("socket");
2120
errno = old_errno;
2121
return ret_errno;
2122
}
2123
2124
if(quit_now){
2125
ret = close(sd);
2126
if(ret == -1){
2127
perror_plus("close");
2128
}
2129
errno = old_errno;
2130
return EINTR;
2131
}
2132
2133
if(debug){
2134
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2135
interface);
2136
}
2137
2138
/* Raise privileges */
2139
ret_errno = raise_privileges();
2140
if(ret_errno != 0){
2141
errno = ret_errno;
2142
perror_plus("Failed to raise privileges");
2143
}
2144
2145
#ifdef __linux__
2146
int ret_linux;
2147
bool restore_loglevel = false;
2148
if(ret_errno == 0){
2149
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2150
messages about the network interface to mess up the prompt */
2151
ret_linux = klogctl(8, NULL, 5);
2152
if(ret_linux == -1){
2153
perror_plus("klogctl");
2154
} else {
2155
restore_loglevel = true;
2156
}
2157
}
2158
#endif /* __linux__ */
2159
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2160
ioctl_errno = errno;
2161
#ifdef __linux__
2162
if(restore_loglevel){
2163
ret_linux = klogctl(7, NULL, 0);
2164
if(ret_linux == -1){
2165
perror_plus("klogctl");
2166
}
2167
}
2168
#endif /* __linux__ */
2169
2170
/* If raise_privileges() succeeded above */
2171
if(ret_errno == 0){
2172
/* Lower privileges */
2173
ret_errno = lower_privileges();
2174
if(ret_errno != 0){
2175
errno = ret_errno;
2176
perror_plus("Failed to lower privileges");
2177
}
2178
}
2179
2180
/* Close the socket */
2181
ret = close(sd);
2182
if(ret == -1){
2183
perror_plus("close");
2184
}
2185
2186
if(ret_setflags == -1){
2187
errno = ioctl_errno;
2188
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2189
errno = old_errno;
2190
return ioctl_errno;
2191
}
2192
} else if(debug){
2193
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2194
interface);
2195
}
2196
2197
/* Sleep checking until interface is running.
2198
Check every 0.25s, up to total time of delay */
2199
for(int i = 0; i < delay * 4; i++){
2200
if(interface_is_running(interface)){
2201
break;
2202
}
2203
struct timespec sleeptime = { .tv_nsec = 250000000 };
2204
ret = nanosleep(&sleeptime, NULL);
2205
if(ret == -1 and errno != EINTR){
2206
perror_plus("nanosleep");
2207
}
2208
}
2209
2210
errno = old_errno;
2211
return 0;
2212
}
2213
2214
__attribute__((nonnull, warn_unused_result))
2215
int take_down_interface(const char *const interface){
2216
int old_errno = errno;
2217
struct ifreq network;
2218
unsigned int if_index = if_nametoindex(interface);
2219
if(if_index == 0){
2220
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2221
errno = old_errno;
2222
return ENXIO;
2223
}
2224
if(interface_is_up(interface)){
2225
int ret_errno = 0;
2226
int ioctl_errno = 0;
2227
if(not get_flags(interface, &network) and debug){
2228
ret_errno = errno;
2229
fprintf_plus(stderr, "Failed to get flags for interface "
2230
"\"%s\"\n", interface);
2231
errno = old_errno;
2232
return ret_errno;
2233
}
2234
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
2236
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2237
if(sd == -1){
2238
ret_errno = errno;
2239
perror_plus("socket");
2240
errno = old_errno;
2241
return ret_errno;
2242
}
2243
2244
if(debug){
2245
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2246
interface);
2247
}
2248
2249
/* Raise privileges */
2250
ret_errno = raise_privileges();
2251
if(ret_errno != 0){
2252
errno = ret_errno;
2253
perror_plus("Failed to raise privileges");
2254
}
2255
2256
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2257
ioctl_errno = errno;
2258
2259
/* If raise_privileges() succeeded above */
2260
if(ret_errno == 0){
2261
/* Lower privileges */
2262
ret_errno = lower_privileges();
2263
if(ret_errno != 0){
2264
errno = ret_errno;
2265
perror_plus("Failed to lower privileges");
2266
}
2267
}
2268
2269
/* Close the socket */
2270
int ret = close(sd);
2271
if(ret == -1){
2272
perror_plus("close");
2273
}
2274
2275
if(ret_setflags == -1){
2276
errno = ioctl_errno;
2277
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2278
errno = old_errno;
2279
return ioctl_errno;
2280
}
2281
} else if(debug){
2282
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2283
interface);
2284
}
2285
2286
errno = old_errno;
2287
return 0;
893
2288
}
894
2289
895
2290
int main(int argc, char *argv[]){
2291
mandos_context mc = { .server = NULL, .dh_bits = 0,
2292
.priority = "SECURE256:!CTYPE-X.509"
2293
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2294
.current_server = NULL, .interfaces = NULL,
2295
.interfaces_size = 0 };
896
2296
AvahiSServiceBrowser *sb = NULL;
897
int error;
2297
error_t ret_errno;
898
2298
int ret;
899
2299
intmax_t tmpmax;
900
2300
char *tmp;
901
2301
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
2302
char *interfaces_to_take_down = NULL;
2303
size_t interfaces_to_take_down_size = 0;
2304
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2305
char old_tempdir[] = "/tmp/mandosXXXXXX";
2306
char *tempdir = NULL;
910
2307
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
2308
const char *seckey = PATHDIR "/" SECKEY;
912
2309
const char *pubkey = PATHDIR "/" PUBKEY;
2310
const char *dh_params_file = NULL;
2311
char *interfaces_hooks = NULL;
913
2312
914
2313
bool gnutls_initialized = false;
915
2314
bool gpgme_initialized = false;
916
2315
float delay = 2.5f;
2316
double retry_interval = 10; /* 10s between trying a server and
2317
retrying the same server again */
917
2318
918
struct sigaction old_sigterm_action;
2319
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
919
2320
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
2321
2322
uid = getuid();
2323
gid = getgid();
2324
2325
/* Lower any group privileges we might have, just to be safe */
2326
errno = 0;
2327
ret = setgid(gid);
2328
if(ret == -1){
2329
perror_plus("setgid");
2330
}
2331
2332
/* Lower user privileges (temporarily) */
2333
errno = 0;
2334
ret = seteuid(uid);
2335
if(ret == -1){
2336
perror_plus("seteuid");
2337
}
2338
2339
if(quit_now){
2340
goto end;
2341
}
2342
921
2343
{
922
2344
struct argp_option options[] = {
923
2345
{ .name = "debug", .key = 128,
944
2366
.doc = "Bit length of the prime number used in the"
945
2367
" Diffie-Hellman key exchange",
946
2368
.group = 2 },
2369
{ .name = "dh-params", .key = 134,
2370
.arg = "FILE",
2371
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2372
" for the Diffie-Hellman key exchange",
2373
.group = 2 },
947
2374
{ .name = "priority", .key = 130,
948
2375
.arg = "STRING",
949
2376
.doc = "GnuTLS priority string for the TLS handshake",
952
2379
.arg = "SECONDS",
953
2380
.doc = "Maximum delay to wait for interface startup",
954
2381
.group = 2 },
2382
{ .name = "retry", .key = 132,
2383
.arg = "SECONDS",
2384
.doc = "Retry interval used when denied by the Mandos server",
2385
.group = 2 },
2386
{ .name = "network-hook-dir", .key = 133,
2387
.arg = "DIR",
2388
.doc = "Directory where network hooks are located",
2389
.group = 2 },
2390
/*
2391
* These reproduce what we would get without ARGP_NO_HELP
2392
*/
2393
{ .name = "help", .key = '?',
2394
.doc = "Give this help list", .group = -1 },
2395
{ .name = "usage", .key = -3,
2396
.doc = "Give a short usage message", .group = -1 },
2397
{ .name = "version", .key = 'V',
2398
.doc = "Print program version", .group = -1 },
955
2399
{ .name = NULL }
956
2400
};
957
2401
958
2402
error_t parse_opt(int key, char *arg,
959
2403
struct argp_state *state){
2404
errno = 0;
960
2405
switch(key){
961
2406
case 128: /* --debug */
962
2407
debug = true;
965
2410
connect_to = arg;
966
2411
break;
967
2412
case 'i': /* --interface */
968
interface = arg;
2413
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2414
arg, (int)',');
2415
if(ret_errno != 0){
2416
argp_error(state, "%s", strerror(ret_errno));
2417
}
969
2418
break;
970
2419
case 's': /* --seckey */
971
2420
seckey = arg;
978
2427
tmpmax = strtoimax(arg, &tmp, 10);
979
2428
if(errno != 0 or tmp == arg or *tmp != '\0'
980
2429
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
2430
argp_error(state, "Bad number of DH bits");
983
2431
}
984
2432
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
2433
break;
2434
case 134: /* --dh-params */
2435
dh_params_file = arg;
2436
break;
986
2437
case 130: /* --priority */
987
2438
mc.priority = arg;
988
2439
break;
990
2441
errno = 0;
991
2442
delay = strtof(arg, &tmp);
992
2443
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
2444
argp_error(state, "Bad delay");
2445
}
2446
case 132: /* --retry */
2447
errno = 0;
2448
retry_interval = strtod(arg, &tmp);
2449
if(errno != 0 or tmp == arg or *tmp != '\0'
2450
or (retry_interval * 1000) > INT_MAX
2451
or retry_interval < 0){
2452
argp_error(state, "Bad retry interval");
2453
}
2454
break;
2455
case 133: /* --network-hook-dir */
2456
hookdir = arg;
2457
break;
2458
/*
2459
* These reproduce what we would get without ARGP_NO_HELP
2460
*/
2461
case '?': /* --help */
2462
argp_state_help(state, state->out_stream,
2463
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2464
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2465
case -3: /* --usage */
2466
argp_state_help(state, state->out_stream,
2467
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2468
case 'V': /* --version */
2469
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2470
exit(argp_err_exit_status);
1000
2471
break;
1001
2472
default:
1002
2473
return ARGP_ERR_UNKNOWN;
1003
2474
}
1004
return 0;
2475
return errno;
1005
2476
}
1006
2477
1007
2478
struct argp argp = { .options = options, .parser = parse_opt,
1008
2479
.args_doc = "",
1009
2480
.doc = "Mandos client -- Get and decrypt"
1010
2481
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
2482
ret_errno = argp_parse(&argp, argc, argv,
2483
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2484
switch(ret_errno){
2485
case 0:
2486
break;
2487
case ENOMEM:
2488
default:
2489
errno = ret_errno;
2490
perror_plus("argp_parse");
2491
exitcode = EX_OSERR;
2492
goto end;
2493
case EINVAL:
2494
exitcode = EX_USAGE;
2495
goto end;
2496
}
2497
}
2498
2499
{
2500
/* Work around Debian bug #633582:
2501
<https://bugs.debian.org/633582> */
2502
2503
/* Re-raise privileges */
2504
ret = raise_privileges();
2505
if(ret != 0){
2506
errno = ret;
2507
perror_plus("Failed to raise privileges");
2508
} else {
2509
struct stat st;
2510
2511
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2512
int seckey_fd = open(seckey, O_RDONLY);
2513
if(seckey_fd == -1){
2514
perror_plus("open");
2515
} else {
2516
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
if(ret == -1){
2518
perror_plus("fstat");
2519
} else {
2520
if(S_ISREG(st.st_mode)
2521
and st.st_uid == 0 and st.st_gid == 0){
2522
ret = fchown(seckey_fd, uid, gid);
2523
if(ret == -1){
2524
perror_plus("fchown");
2525
}
2526
}
2527
}
2528
close(seckey_fd);
2529
}
2530
}
2531
2532
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2533
int pubkey_fd = open(pubkey, O_RDONLY);
2534
if(pubkey_fd == -1){
2535
perror_plus("open");
2536
} else {
2537
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
if(ret == -1){
2539
perror_plus("fstat");
2540
} else {
2541
if(S_ISREG(st.st_mode)
2542
and st.st_uid == 0 and st.st_gid == 0){
2543
ret = fchown(pubkey_fd, uid, gid);
2544
if(ret == -1){
2545
perror_plus("fchown");
2546
}
2547
}
2548
}
2549
close(pubkey_fd);
2550
}
2551
}
2552
2553
if(dh_params_file != NULL
2554
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2555
int dhparams_fd = open(dh_params_file, O_RDONLY);
2556
if(dhparams_fd == -1){
2557
perror_plus("open");
2558
} else {
2559
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
if(ret == -1){
2561
perror_plus("fstat");
2562
} else {
2563
if(S_ISREG(st.st_mode)
2564
and st.st_uid == 0 and st.st_gid == 0){
2565
ret = fchown(dhparams_fd, uid, gid);
2566
if(ret == -1){
2567
perror_plus("fchown");
2568
}
2569
}
2570
}
2571
close(dhparams_fd);
2572
}
2573
}
2574
2575
/* Lower privileges */
2576
ret = lower_privileges();
2577
if(ret != 0){
2578
errno = ret;
2579
perror_plus("Failed to lower privileges");
2580
}
2581
}
2582
}
2583
2584
/* Remove invalid interface names (except "none") */
2585
{
2586
char *interface = NULL;
2587
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
interface))){
2589
if(strcmp(interface, "none") != 0
2590
and if_nametoindex(interface) == 0){
2591
if(interface[0] != '\0'){
2592
fprintf_plus(stderr, "Not using nonexisting interface"
2593
" \"%s\"\n", interface);
2594
}
2595
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2596
interface = NULL;
2597
}
2598
}
2599
}
2600
2601
/* Run network hooks */
2602
{
2603
if(mc.interfaces != NULL){
2604
interfaces_hooks = malloc(mc.interfaces_size);
2605
if(interfaces_hooks == NULL){
2606
perror_plus("malloc");
2607
goto end;
2608
}
2609
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2610
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
}
2612
run_network_hooks("start", interfaces_hooks != NULL ?
2613
interfaces_hooks : "", delay);
1017
2614
}
1018
2615
1019
2616
if(not debug){
1024
2621
from the signal handler */
1025
2622
/* Initialize the pseudo-RNG for Avahi */
1026
2623
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
2624
simple_poll = avahi_simple_poll_new();
2625
if(simple_poll == NULL){
2626
fprintf_plus(stderr,
2627
"Avahi: Failed to create simple poll object.\n");
2628
exitcode = EX_UNAVAILABLE;
1031
2629
goto end;
1032
2630
}
1033
2631
1034
2632
sigemptyset(&sigterm_action.sa_mask);
1035
2633
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
2634
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
2635
perror_plus("sigaddset");
2636
exitcode = EX_OSERR;
1039
2637
goto end;
1040
2638
}
1041
2639
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
2640
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
2641
perror_plus("sigaddset");
2642
exitcode = EX_OSERR;
1045
2643
goto end;
1046
2644
}
1047
2645
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
2646
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
2647
perror_plus("sigaddset");
2648
exitcode = EX_OSERR;
2649
goto end;
2650
}
2651
/* Need to check if the handler is SIG_IGN before handling:
2652
| [[info:libc:Initial Signal Actions]] |
2653
| [[info:libc:Basic Signal Handling]] |
2654
*/
2655
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2656
if(ret == -1){
2657
perror_plus("sigaction");
2658
return EX_OSERR;
2659
}
2660
if(old_sigterm_action.sa_handler != SIG_IGN){
2661
ret = sigaction(SIGINT, &sigterm_action, NULL);
2662
if(ret == -1){
2663
perror_plus("sigaction");
2664
exitcode = EX_OSERR;
2665
goto end;
2666
}
2667
}
2668
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2669
if(ret == -1){
2670
perror_plus("sigaction");
2671
return EX_OSERR;
2672
}
2673
if(old_sigterm_action.sa_handler != SIG_IGN){
2674
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2675
if(ret == -1){
2676
perror_plus("sigaction");
2677
exitcode = EX_OSERR;
2678
goto end;
2679
}
2680
}
2681
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2682
if(ret == -1){
2683
perror_plus("sigaction");
2684
return EX_OSERR;
2685
}
2686
if(old_sigterm_action.sa_handler != SIG_IGN){
2687
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2688
if(ret == -1){
2689
perror_plus("sigaction");
2690
exitcode = EX_OSERR;
2691
goto end;
2692
}
2693
}
2694
2695
/* If no interfaces were specified, make a list */
2696
if(mc.interfaces == NULL){
2697
struct dirent **direntries = NULL;
2698
/* Look for any good interfaces */
2699
ret = scandir(sys_class_net, &direntries, good_interface,
2700
alphasort);
2701
if(ret >= 1){
2702
/* Add all found interfaces to interfaces list */
2703
for(int i = 0; i < ret; ++i){
2704
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2705
direntries[i]->d_name);
2706
if(ret_errno != 0){
2707
errno = ret_errno;
2708
perror_plus("argz_add");
2709
free(direntries[i]);
2710
continue;
2711
}
2712
if(debug){
2713
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2714
direntries[i]->d_name);
2715
}
2716
free(direntries[i]);
2717
}
2718
free(direntries);
2719
} else {
2720
if(ret == 0){
2721
free(direntries);
2722
}
2723
fprintf_plus(stderr, "Could not find a network interface\n");
2724
exitcode = EXIT_FAILURE;
2725
goto end;
2726
}
2727
}
2728
2729
/* Bring up interfaces which are down, and remove any "none"s */
2730
{
2731
char *interface = NULL;
2732
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
interface))){
2734
/* If interface name is "none", stop bringing up interfaces.
2735
Also remove all instances of "none" from the list */
2736
if(strcmp(interface, "none") == 0){
2737
argz_delete(&mc.interfaces, &mc.interfaces_size,
2738
interface);
2739
interface = NULL;
2740
while((interface = argz_next(mc.interfaces,
2741
mc.interfaces_size, interface))){
2742
if(strcmp(interface, "none") == 0){
2743
argz_delete(&mc.interfaces, &mc.interfaces_size,
2744
interface);
2745
interface = NULL;
1113
2746
}
1114
2747
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
2748
break;
1126
2749
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
2750
bool interface_was_up = interface_is_up(interface);
2751
errno = bring_up_interface(interface, delay);
2752
if(not interface_was_up){
2753
if(errno != 0){
2754
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2755
" %s\n", interface, strerror(errno));
2756
} else {
2757
errno = argz_add(&interfaces_to_take_down,
2758
&interfaces_to_take_down_size,
2759
interface);
2760
if(errno != 0){
2761
perror_plus("argz_add");
2762
}
2763
}
2764
}
2765
}
2766
if(debug and (interfaces_to_take_down == NULL)){
2767
fprintf_plus(stderr, "No interfaces were brought up\n");
2768
}
2769
}
2770
2771
/* If we only got one interface, explicitly use only that one */
2772
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
if(debug){
2774
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2775
mc.interfaces);
2776
}
2777
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2778
}
2779
2780
if(quit_now){
2781
goto end;
2782
}
2783
2784
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2785
if(ret == -1){
2786
fprintf_plus(stderr, "init_gnutls_global failed\n");
2787
exitcode = EX_UNAVAILABLE;
1166
2788
goto end;
1167
2789
} else {
1168
2790
gnutls_initialized = true;
1169
2791
}
1170
2792
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
2793
if(quit_now){
2794
goto end;
2795
}
2796
2797
/* Try /run/tmp before /tmp */
2798
tempdir = mkdtemp(run_tempdir);
2799
if(tempdir == NULL and errno == ENOENT){
2800
if(debug){
2801
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2802
run_tempdir, old_tempdir);
2803
}
2804
tempdir = mkdtemp(old_tempdir);
2805
}
2806
if(tempdir == NULL){
2807
perror_plus("mkdtemp");
2808
goto end;
2809
}
2810
2811
if(quit_now){
2812
goto end;
2813
}
2814
2815
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2816
fprintf_plus(stderr, "init_gpgme failed\n");
2817
exitcode = EX_UNAVAILABLE;
1180
2818
goto end;
1181
2819
} else {
1182
2820
gpgme_initialized = true;
1183
2821
}
1184
2822
1185
if(interface[0] != '\0'){
1186
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
if(if_index == 0){
1188
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
2823
if(quit_now){
2824
goto end;
1192
2825
}
1193
2826
1194
2827
if(connect_to != NULL){
1195
2828
/* Connect directly, do not use Zeroconf */
1196
2829
/* (Mainly meant for debugging) */
1197
2830
char *address = strrchr(connect_to, ':');
2831
1198
2832
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
2833
fprintf_plus(stderr, "No colon in address\n");
2834
exitcode = EX_USAGE;
2835
goto end;
2836
}
2837
2838
if(quit_now){
2839
goto end;
2840
}
2841
2842
in_port_t port;
1204
2843
errno = 0;
1205
2844
tmpmax = strtoimax(address+1, &tmp, 10);
1206
2845
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
2846
or tmpmax != (in_port_t)tmpmax){
2847
fprintf_plus(stderr, "Bad port number\n");
2848
exitcode = EX_USAGE;
2849
goto end;
2850
}
2851
2852
if(quit_now){
2853
goto end;
2854
}
2855
2856
port = (in_port_t)tmpmax;
1213
2857
*address = '\0';
1214
address = connect_to;
1215
2858
/* Colon in address indicates IPv6 */
1216
2859
int af;
1217
if(strchr(address, ':') != NULL){
2860
if(strchr(connect_to, ':') != NULL){
1218
2861
af = AF_INET6;
2862
/* Accept [] around IPv6 address - see RFC 5952 */
2863
if(connect_to[0] == '[' and address[-1] == ']')
2864
{
2865
connect_to++;
2866
address[-1] = '\0';
2867
}
1219
2868
} else {
1220
2869
af = AF_INET;
1221
2870
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
2871
address = connect_to;
2872
2873
if(quit_now){
2874
goto end;
2875
}
2876
2877
while(not quit_now){
2878
ret = start_mandos_communication(address, port, if_index, af,
2879
&mc);
2880
if(quit_now or ret == 0){
2881
break;
2882
}
2883
if(debug){
2884
fprintf_plus(stderr, "Retrying in %d seconds\n",
2885
(int)retry_interval);
2886
}
2887
sleep((unsigned int)retry_interval);
2888
}
2889
2890
if(not quit_now){
1226
2891
exitcode = EXIT_SUCCESS;
1227
2892
}
1228
goto end;
1229
}
1230
2893
2894
goto end;
2895
}
2896
2897
if(quit_now){
2898
goto end;
2899
}
2900
1231
2901
{
1232
2902
AvahiServerConfig config;
1233
2903
/* Do not publish any local Zeroconf records */
1238
2908
config.publish_domain = 0;
1239
2909
1240
2910
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
2911
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2912
&config, NULL, NULL, &ret);
1244
2913
1245
2914
/* Free the Avahi configuration data */
1246
2915
avahi_server_config_free(&config);
1248
2917
1249
2918
/* Check if creating the Avahi server object succeeded */
1250
2919
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
2920
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2921
avahi_strerror(ret));
2922
exitcode = EX_UNAVAILABLE;
2923
goto end;
2924
}
2925
2926
if(quit_now){
1254
2927
goto end;
1255
2928
}
1256
2929
1257
2930
/* Create the Avahi service browser */
1258
2931
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
2932
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
2933
NULL, 0, browse_callback,
2934
(void *)&mc);
1261
2935
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
2936
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2937
avahi_strerror(avahi_server_errno(mc.server)));
2938
exitcode = EX_UNAVAILABLE;
2939
goto end;
2940
}
2941
2942
if(quit_now){
1265
2943
goto end;
1266
2944
}
1267
2945
1268
2946
/* Run the main loop */
1269
2947
1270
2948
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
2949
fprintf_plus(stderr, "Starting Avahi loop search\n");
1272
2950
}
1273
2951
1274
avahi_simple_poll_loop(mc.simple_poll);
2952
ret = avahi_loop_with_timeout(simple_poll,
2953
(int)(retry_interval * 1000), &mc);
2954
if(debug){
2955
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2956
(ret == 0) ? "successfully" : "with error");
2957
}
1275
2958
1276
2959
end:
1277
2960
1278
2961
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
2962
if(signal_received){
2963
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2964
argv[0], signal_received,
2965
strsignal(signal_received));
2966
} else {
2967
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2968
}
1280
2969
}
1281
2970
1282
2971
/* Cleanup things */
2972
free(mc.interfaces);
2973
1283
2974
if(sb != NULL)
1284
2975
avahi_s_service_browser_free(sb);
1285
2976
1286
2977
if(mc.server != NULL)
1287
2978
avahi_server_free(mc.server);
1288
2979
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
2980
if(simple_poll != NULL)
2981
avahi_simple_poll_free(simple_poll);
1291
2982
1292
2983
if(gnutls_initialized){
1293
2984
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
2985
gnutls_dh_params_deinit(mc.dh_params);
1296
2986
}
1297
2987
1299
2989
gpgme_release(mc.ctx);
1300
2990
}
1301
2991
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
2992
/* Cleans up the circular linked list of Mandos servers the client
2993
has seen */
2994
if(mc.current_server != NULL){
2995
mc.current_server->prev->next = NULL;
2996
while(mc.current_server != NULL){
2997
server *next = mc.current_server->next;
2998
#ifdef __GNUC__
2999
#pragma GCC diagnostic push
3000
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
#endif
3002
free((char *)(mc.current_server->ip));
3003
#ifdef __GNUC__
3004
#pragma GCC diagnostic pop
3005
#endif
3006
free(mc.current_server);
3007
mc.current_server = next;
3008
}
3009
}
3010
3011
/* Re-raise privileges */
3012
{
3013
ret = raise_privileges();
3014
if(ret != 0){
3015
errno = ret;
3016
perror_plus("Failed to raise privileges");
3017
} else {
3018
3019
/* Run network hooks */
3020
run_network_hooks("stop", interfaces_hooks != NULL ?
3021
interfaces_hooks : "", delay);
3022
3023
/* Take down the network interfaces which were brought up */
3024
{
3025
char *interface = NULL;
3026
while((interface = argz_next(interfaces_to_take_down,
3027
interfaces_to_take_down_size,
3028
interface))){
3029
ret = take_down_interface(interface);
3030
if(ret != 0){
3031
errno = ret;
3032
perror_plus("Failed to take down interface");
3033
}
3034
}
3035
if(debug and (interfaces_to_take_down == NULL)){
3036
fprintf_plus(stderr, "No interfaces needed to be taken"
3037
" down\n");
3038
}
3039
}
3040
}
3041
3042
ret = lower_privileges_permanently();
3043
if(ret != 0){
3044
errno = ret;
3045
perror_plus("Failed to lower privileges permanently");
3046
}
3047
}
3048
3049
free(interfaces_to_take_down);
3050
free(interfaces_hooks);
3051
3052
void clean_dir_at(int base, const char * const dirname,
3053
uintmax_t level){
3054
struct dirent **direntries = NULL;
3055
int dret;
3056
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3057
O_RDONLY
3058
| O_NOFOLLOW
3059
| O_DIRECTORY
3060
| O_PATH));
3061
if(dir_fd == -1){
3062
perror_plus("open");
3063
}
3064
int numentries = scandirat(dir_fd, ".", &direntries,
3065
notdotentries, alphasort);
3066
if(numentries >= 0){
3067
for(int i = 0; i < numentries; i++){
3068
if(debug){
3069
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3070
dirname, direntries[i]->d_name);
3071
}
3072
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(dret == -1){
3074
if(errno == EISDIR){
3075
dret = unlinkat(dir_fd, direntries[i]->d_name,
3076
AT_REMOVEDIR);
3077
}
3078
if((dret == -1) and (errno == ENOTEMPTY)
3079
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3080
== 0) and (level == 0)){
3081
/* Recurse only in this special case */
3082
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3083
dret = 0;
3084
}
3085
if(dret == -1){
3086
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3087
direntries[i]->d_name, strerror(errno));
3088
}
3089
}
3090
free(direntries[i]);
3091
}
3092
3093
/* need to clean even if 0 because man page doesn't specify */
3094
free(direntries);
3095
if(numentries == -1){
3096
perror_plus("scandirat");
3097
}
3098
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3099
if(dret == -1 and errno != ENOENT){
3100
perror_plus("rmdir");
3101
}
3102
} else {
3103
perror_plus("scandirat");
3104
}
3105
close(dir_fd);
3106
}
3107
3108
/* Removes the GPGME temp directory and all files inside */
3109
if(tempdir != NULL){
3110
clean_dir_at(-1, tempdir, 0);
3111
}
3112
3113
if(quit_now){
3114
sigemptyset(&old_sigterm_action.sa_mask);
3115
old_sigterm_action.sa_handler = SIG_DFL;
3116
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3117
&old_sigterm_action,
3118
NULL));
3119
if(ret == -1){
3120
perror_plus("sigaction");
3121
}
3122
do {
3123
ret = raise(signal_received);
3124
} while(ret != 0 and errno == EINTR);
3125
if(ret != 0){
3126
perror_plus("raise");
3127
abort();
3128
}
3129
TEMP_FAILURE_RETRY(pause());
1344
3130
}
1345
3131
1346
3132
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0