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237.7.358
(compared to revision 237.2.36)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2016-02-28 20:26:27 UTC
- mto: (237.7.594 trunk)
- mto: This revision was merged to the branch mainline in revision 333.
- Revision ID: teddy@recompile.se-20160228202627-vls5dia6repq6ks2
Depend on the GNU C Library 2.16 or later
* INSTALL: Document dependency.
* plugin-runner.c: Remove #ifdefs for scandirat() and adding of
-Wsign-conversion for FD_SET, FD_CLR, and FD_ISSET.
* plugins.d/mandos-client.c: - '' -
* INSTALL: Document dependency.
* plugin-runner.c: Remove #ifdefs for scandirat() and adding of
-Wsign-conversion for FD_SET, FD_CLR, and FD_ISSET.
* plugins.d/mandos-client.c: - '' -
- 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 © 2008-2016 Teddy Hogeborn
13
* Copyright © 2008-2016 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
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf */
40
#include <stdint.h> /* uint16_t, uint32_t */
43
stdout, ferror() */
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
45
#include <string.h> /* memset(), strcmp(), strlen(),
46
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(),
52
DIR */
53
#include <sys/stat.h> /* open() */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open(), S_ISREG */
54
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
56
connect() */
57
#include <fcntl.h> /* open() */
58
inet_pton(), connect(),
59
getnameinfo() */
60
#include <fcntl.h> /* open(), unlinkat() */
58
61
#include <dirent.h> /* opendir(), struct dirent, readdir()
59
62
*/
60
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
61
#include <assert.h> /* assert() */
62
#include <errno.h> /* perror(), errno */
63
#include <time.h> /* time() */
63
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
strtoimax() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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69
SIOCSIFFLAGS, if_indextoname(),
66
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if_nametoindex(), IF_NAMESIZE */
67
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
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INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
69
getuid(), getgid(), setuid(),
70
setgid() */
71
#include <arpa/inet.h> /* inet_pton(), htons */
72
#include <iso646.h> /* not, and, or */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit(),
77
unlinkat() */
78
#include <arpa/inet.h> /* inet_pton(), htons() */
79
#include <iso646.h> /* not, or, and */
73
80
#include <argp.h> /* struct argp_option, error_t, struct
74
81
argp_state, struct argp,
75
82
argp_parse(), ARGP_KEY_ARG,
76
83
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
84
#include <signal.h> /* sigemptyset(), sigaddset(),
85
sigaction(), SIGTERM, sig_atomic_t,
86
raise() */
87
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
88
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
89
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
90
WEXITSTATUS(), WTERMSIG() */
91
#include <grp.h> /* setgroups() */
92
#include <argz.h> /* argz_add_sep(), argz_next(),
93
argz_delete(), argz_append(),
94
argz_stringify(), argz_add(),
95
argz_count() */
96
#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,
97
EAI_SYSTEM, gai_strerror() */
98
99
#ifdef __linux__
100
#include <sys/klog.h> /* klogctl() */
101
#endif /* __linux__ */
77
102
78
103
/* Avahi */
79
104
/* All Avahi types, constants and functions
93
118
init_gnutls_session(),
94
119
GNUTLS_* */
95
120
#include <gnutls/openpgp.h>
96
/* gnutls_certificate_set_openpgp_key_file(),
97
GNUTLS_OPENPGP_FMT_BASE64 */
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
98
123
99
124
/* GPGME */
100
125
#include <gpgme.h> /* All GPGME types, constants and
108
133
#define PATHDIR "/conf/conf.d/mandos"
109
134
#define SECKEY "seckey.txt"
110
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
111
137
112
138
bool debug = false;
113
139
static const char mandos_protocol_version[] = "1";
114
140
const char *argp_program_version = "mandos-client " VERSION;
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
145
int hookdir_fd = -1;
146
uid_t uid = 65534;
147
gid_t gid = 65534;
148
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
151
const char *ip;
152
in_port_t port;
153
AvahiIfIndex if_index;
154
int af;
155
struct timespec last_seen;
156
struct server *next;
157
struct server *prev;
158
} server;
116
159
117
160
/* Used for passing in values through the Avahi callback functions */
118
161
typedef struct {
119
AvahiSimplePoll *simple_poll;
120
162
AvahiServer *server;
121
163
gnutls_certificate_credentials_t cred;
122
164
unsigned int dh_bits;
123
165
gnutls_dh_params_t dh_params;
124
166
const char *priority;
125
167
gpgme_ctx_t ctx;
168
server *current_server;
169
char *interfaces;
170
size_t interfaces_size;
126
171
} mandos_context;
127
172
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
175
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
178
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/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
181
int e = errno;
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
184
errno = e;
185
perror(print_text);
186
}
187
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__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_list ap;
191
va_start (ap, format);
192
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TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
196
}
197
128
198
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
131
201
* "buffer_length" is how much is already used.
132
202
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
size_t buffer_capacity){
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
135
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if(buffer == NULL){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
if(new_buf == NULL){
209
int old_errno = errno;
210
free(*buffer);
211
errno = old_errno;
212
*buffer = NULL;
138
213
return 0;
139
214
}
215
*buffer = new_buf;
140
216
buffer_capacity += BUFFER_SIZE;
141
217
}
142
218
return buffer_capacity;
143
219
}
144
220
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
225
int ret;
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
229
return false;
230
}
231
*new_server = (server){ .ip = strdup(ip),
232
.port = port,
233
.if_index = if_index,
234
.af = af };
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
237
free(new_server);
238
return false;
239
}
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
if(ret == -1){
242
perror_plus("clock_gettime");
243
#ifdef __GNUC__
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
246
#endif
247
free((char *)(new_server->ip));
248
#ifdef __GNUC__
249
#pragma GCC diagnostic pop
250
#endif
251
free(new_server);
252
return false;
253
}
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
259
} else {
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
265
}
266
return true;
267
}
268
145
269
/*
146
270
* Initialize GPGME.
147
271
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
150
int ret;
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
276
mandos_context *mc){
151
277
gpgme_error_t rc;
152
278
gpgme_engine_info_t engine_info;
153
279
154
155
280
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
281
* Helper function to insert pub and seckey to the engine keyring.
157
282
*/
158
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
284
int ret;
159
285
int fd;
160
286
gpgme_data_t pgp_data;
161
287
162
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
289
if(fd == -1){
164
perror("open");
290
perror_plus("open");
165
291
return false;
166
292
}
167
293
168
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
295
if(rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
172
298
return false;
173
299
}
174
300
175
301
rc = gpgme_op_import(mc->ctx, pgp_data);
176
302
if(rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
179
305
return false;
180
306
}
181
307
182
ret = (int)TEMP_FAILURE_RETRY(close(fd));
308
ret = close(fd);
183
309
if(ret == -1){
184
perror("close");
310
perror_plus("close");
185
311
}
186
312
gpgme_data_release(pgp_data);
187
313
return true;
188
314
}
189
315
190
316
if(debug){
191
fprintf(stderr, "Initialize gpgme\n");
317
fprintf_plus(stderr, "Initializing GPGME\n");
192
318
}
193
319
194
320
/* Init GPGME */
195
321
gpgme_check_version(NULL);
196
322
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
323
if(rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
200
326
return false;
201
327
}
202
328
203
/* Set GPGME home directory for the OpenPGP engine only */
329
/* Set GPGME home directory for the OpenPGP engine only */
204
330
rc = gpgme_get_engine_info(&engine_info);
205
331
if(rc != GPG_ERR_NO_ERROR){
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
gpgme_strsource(rc), gpgme_strerror(rc));
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
208
334
return false;
209
335
}
210
336
while(engine_info != NULL){
216
342
engine_info = engine_info->next;
217
343
}
218
344
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
346
tempdir);
220
347
return false;
221
348
}
222
349
223
350
/* Create new GPGME "context" */
224
351
rc = gpgme_new(&(mc->ctx));
225
352
if(rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
355
gpgme_strerror(rc));
228
356
return false;
229
357
}
230
358
232
360
return false;
233
361
}
234
362
235
return true;
363
return true;
236
364
}
237
365
238
366
/*
239
367
* Decrypt OpenPGP data.
240
368
* Returns -1 on error
241
369
*/
242
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
243
const char *cryptotext,
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
244
372
size_t crypto_size,
245
char **plaintext){
373
char **plaintext,
374
mandos_context *mc){
246
375
gpgme_data_t dh_crypto, dh_plain;
247
376
gpgme_error_t rc;
248
377
ssize_t ret;
250
379
ssize_t plaintext_length = 0;
251
380
252
381
if(debug){
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
254
383
}
255
384
256
385
/* Create new GPGME data buffer from memory cryptotext */
257
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
387
0);
259
388
if(rc != GPG_ERR_NO_ERROR){
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
262
391
return -1;
263
392
}
264
393
265
394
/* Create new empty GPGME data buffer for the plaintext */
266
395
rc = gpgme_data_new(&dh_plain);
267
396
if(rc != GPG_ERR_NO_ERROR){
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
270
400
gpgme_data_release(dh_crypto);
271
401
return -1;
272
402
}
275
405
data buffer */
276
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
407
if(rc != GPG_ERR_NO_ERROR){
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
280
410
plaintext_length = -1;
281
411
if(debug){
282
412
gpgme_decrypt_result_t result;
283
413
result = gpgme_op_decrypt_result(mc->ctx);
284
414
if(result == NULL){
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
286
416
} else {
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
291
421
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
293
423
}
294
424
gpgme_recipient_t recipient;
295
425
recipient = result->recipients;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
426
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
433
? "No" : "Yes");
434
recipient = recipient->next;
306
435
}
307
436
}
308
437
}
310
439
}
311
440
312
441
if(debug){
313
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
314
443
}
315
444
316
445
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
447
perror_plus("gpgme_data_seek");
319
448
plaintext_length = -1;
320
449
goto decrypt_end;
321
450
}
322
451
323
452
*plaintext = NULL;
324
453
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
326
(size_t)plaintext_length,
327
plaintext_capacity);
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
456
plaintext_capacity);
328
457
if(plaintext_capacity == 0){
329
perror("adjustbuffer");
330
plaintext_length = -1;
331
goto decrypt_end;
458
perror_plus("incbuffer");
459
plaintext_length = -1;
460
goto decrypt_end;
332
461
}
333
462
334
463
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
339
468
break;
340
469
}
341
470
if(ret < 0){
342
perror("gpgme_data_read");
471
perror_plus("gpgme_data_read");
343
472
plaintext_length = -1;
344
473
goto decrypt_end;
345
474
}
347
476
}
348
477
349
478
if(debug){
350
fprintf(stderr, "Decrypted password is: ");
479
fprintf_plus(stderr, "Decrypted password is: ");
351
480
for(ssize_t i = 0; i < plaintext_length; i++){
352
481
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
353
482
}
364
493
return plaintext_length;
365
494
}
366
495
367
static const char * safer_gnutls_strerror(int value) {
368
const char *ret = gnutls_strerror(value); /* Spurious warning from
369
-Wunreachable-code */
370
if(ret == NULL)
371
ret = "(unknown)";
372
return ret;
496
__attribute__((warn_unused_result, const))
497
static const char *safe_string(const char *str){
498
if(str == NULL)
499
return "(unknown)";
500
return str;
501
}
502
503
__attribute__((warn_unused_result))
504
static const char *safer_gnutls_strerror(int value){
505
const char *ret = gnutls_strerror(value);
506
return safe_string(ret);
373
507
}
374
508
375
509
/* GnuTLS log function callback */
510
__attribute__((nonnull))
376
511
static void debuggnutls(__attribute__((unused)) int level,
377
512
const char* string){
378
fprintf(stderr, "GnuTLS: %s", string);
513
fprintf_plus(stderr, "GnuTLS: %s", string);
379
514
}
380
515
381
static int init_gnutls_global(mandos_context *mc,
382
const char *pubkeyfilename,
383
const char *seckeyfilename){
516
__attribute__((nonnull, warn_unused_result))
517
static int init_gnutls_global(const char *pubkeyfilename,
518
const char *seckeyfilename,
519
const char *dhparamsfilename,
520
mandos_context *mc){
384
521
int ret;
522
unsigned int uret;
385
523
386
524
if(debug){
387
fprintf(stderr, "Initializing GnuTLS\n");
525
fprintf_plus(stderr, "Initializing GnuTLS\n");
388
526
}
389
527
390
528
ret = gnutls_global_init();
391
if(ret != GNUTLS_E_SUCCESS) {
392
fprintf(stderr, "GnuTLS global_init: %s\n",
393
safer_gnutls_strerror(ret));
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
531
safer_gnutls_strerror(ret));
394
532
return -1;
395
533
}
396
534
403
541
}
404
542
405
543
/* OpenPGP credentials */
406
gnutls_certificate_allocate_credentials(&mc->cred);
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
407
545
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
409
* from
410
* -Wunreachable-code
411
*/
412
safer_gnutls_strerror(ret));
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
413
548
gnutls_global_deinit();
414
549
return -1;
415
550
}
416
551
417
552
if(debug){
418
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
419
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
420
seckeyfilename);
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
555
pubkeyfilename,
556
seckeyfilename);
421
557
}
422
558
423
559
ret = gnutls_certificate_set_openpgp_key_file
424
560
(mc->cred, pubkeyfilename, seckeyfilename,
425
561
GNUTLS_OPENPGP_FMT_BASE64);
426
if(ret != GNUTLS_E_SUCCESS) {
427
fprintf(stderr,
428
"Error[%d] while reading the OpenPGP key pair ('%s',"
429
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
fprintf(stderr, "The GnuTLS error is: %s\n",
431
safer_gnutls_strerror(ret));
562
if(ret != GNUTLS_E_SUCCESS){
563
fprintf_plus(stderr,
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
432
568
goto globalfail;
433
569
}
434
570
435
571
/* GnuTLS server initialization */
436
572
ret = gnutls_dh_params_init(&mc->dh_params);
437
if(ret != GNUTLS_E_SUCCESS) {
438
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
439
" %s\n", safer_gnutls_strerror(ret));
440
goto globalfail;
441
}
442
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
443
if(ret != GNUTLS_E_SUCCESS) {
444
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
445
safer_gnutls_strerror(ret));
446
goto globalfail;
447
}
448
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
577
goto globalfail;
578
}
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
582
do {
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
584
if(dhpfile == -1){
585
perror_plus("open");
586
dhparamsfilename = NULL;
587
break;
588
}
589
size_t params_capacity = 0;
590
while(true){
591
params_capacity = incbuffer((char **)¶ms.data,
592
(size_t)params.size,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
596
free(params.data);
597
params.data = NULL;
598
dhparamsfilename = NULL;
599
break;
600
}
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
603
BUFFER_SIZE);
604
/* EOF */
605
if(bytes_read == 0){
606
break;
607
}
608
/* check bytes_read for failure */
609
if(bytes_read < 0){
610
perror_plus("read");
611
free(params.data);
612
params.data = NULL;
613
dhparamsfilename = NULL;
614
break;
615
}
616
params.size += (unsigned int)bytes_read;
617
}
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
620
}
621
if(dhparamsfilename == NULL){
622
break;
623
}
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
631
}
632
} while(false);
633
}
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
639
do {
640
int secfile = open(seckeyfilename, O_RDONLY);
641
if(secfile == -1){
642
perror_plus("open");
643
break;
644
}
645
size_t buffer_capacity = 0;
646
while(true){
647
buffer_capacity = incbuffer((char **)&buffer.data,
648
(size_t)buffer.size,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
652
free(buffer.data);
653
buffer.data = NULL;
654
break;
655
}
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
658
BUFFER_SIZE);
659
/* EOF */
660
if(bytes_read == 0){
661
break;
662
}
663
/* check bytes_read for failure */
664
if(bytes_read < 0){
665
perror_plus("read");
666
free(buffer.data);
667
buffer.data = NULL;
668
break;
669
}
670
buffer.size += (unsigned int)bytes_read;
671
}
672
close(secfile);
673
} while(false);
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
677
{
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
682
" structure: %s",
683
safer_gnutls_strerror(ret));
684
free(buffer.data);
685
buffer.data = NULL;
686
} else {
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
692
privkey = NULL;
693
}
694
free(buffer.data);
695
buffer.data = NULL;
696
if(privkey != NULL){
697
/* Use private key to suggest an appropriate
698
sec_param */
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
701
if(debug){
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
705
(sec_param)));
706
}
707
}
708
}
709
}
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
713
if(debug){
714
fprintf_plus(stderr, "Falling back to security parameter"
715
" \"%s\"\n",
716
safe_string(gnutls_sec_param_get_name
717
(sec_param)));
718
}
719
}
720
}
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
if(uret != 0){
723
mc->dh_bits = uret;
724
if(debug){
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
728
(sec_param)),
729
mc->dh_bits);
730
}
731
} else {
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
735
(sec_param)),
736
safer_gnutls_strerror(ret));
737
goto globalfail;
738
}
739
} else if(debug){
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
mc->dh_bits);
742
}
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
748
goto globalfail;
749
}
750
}
449
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
450
752
451
753
return 0;
458
760
return -1;
459
761
}
460
762
461
static int init_gnutls_session(mandos_context *mc,
462
gnutls_session_t *session){
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
765
mandos_context *mc){
463
766
int ret;
464
767
/* GnuTLS session creation */
465
ret = gnutls_init(session, GNUTLS_SERVER);
768
do {
769
ret = gnutls_init(session, GNUTLS_SERVER);
770
if(quit_now){
771
return -1;
772
}
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
466
774
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
468
safer_gnutls_strerror(ret));
775
fprintf_plus(stderr,
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
469
778
}
470
779
471
780
{
472
781
const char *err;
473
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
474
if(ret != GNUTLS_E_SUCCESS) {
475
fprintf(stderr, "Syntax error at: %s\n", err);
476
fprintf(stderr, "GnuTLS error: %s\n",
477
safer_gnutls_strerror(ret));
782
do {
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
784
if(quit_now){
785
gnutls_deinit(*session);
786
return -1;
787
}
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
789
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
478
793
gnutls_deinit(*session);
479
794
return -1;
480
795
}
481
796
}
482
797
483
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
484
mc->cred);
485
if(ret != GNUTLS_E_SUCCESS) {
486
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
487
safer_gnutls_strerror(ret));
798
do {
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
800
mc->cred);
801
if(quit_now){
802
gnutls_deinit(*session);
803
return -1;
804
}
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
806
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
488
809
gnutls_deinit(*session);
489
810
return -1;
490
811
}
491
812
492
813
/* ignore client certificate if any. */
493
gnutls_certificate_server_set_request(*session,
494
GNUTLS_CERT_IGNORE);
495
496
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
815
498
816
return 0;
499
817
}
502
820
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
503
821
__attribute__((unused)) const char *txt){}
504
822
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
829
ret_errno = errno;
830
}
831
errno = old_errno;
832
return ret_errno;
833
}
834
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
840
if(ret_errno != 0){
841
errno = old_errno;
842
return ret_errno;
843
}
844
if(setuid(0) == -1){
845
ret_errno = errno;
846
}
847
errno = old_errno;
848
return ret_errno;
849
}
850
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
857
ret_errno = errno;
858
}
859
errno = old_errno;
860
return ret_errno;
861
}
862
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
869
ret_errno = errno;
870
}
871
errno = old_errno;
872
return ret_errno;
873
}
874
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
878
const char *address,
879
AvahiIfIndex if_index){
880
int ret;
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
887
if(debug){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
890
}
891
return false;
892
}
893
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
897
return false;
898
}
899
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
901
if(devnull == -1){
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
return false;
904
}
905
pid_t pid = fork();
906
if(pid == 0){
907
/* Child */
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
910
if(errno != 0){
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
913
} else {
914
/* Set group */
915
errno = 0;
916
ret = setgid(0);
917
if(ret == -1){
918
perror_plus("setgid");
919
_exit(EX_NOPERM);
920
}
921
/* Reset supplementary groups */
922
errno = 0;
923
ret = setgroups(0, NULL);
924
if(ret == -1){
925
perror_plus("setgroups");
926
_exit(EX_NOPERM);
927
}
928
}
929
ret = dup2(devnull, STDIN_FILENO);
930
if(ret == -1){
931
perror_plus("dup2(devnull, STDIN_FILENO)");
932
_exit(EX_OSERR);
933
}
934
ret = close(devnull);
935
if(ret == -1){
936
perror_plus("close");
937
_exit(EX_OSERR);
938
}
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
940
if(ret == -1){
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
942
_exit(EX_OSERR);
943
}
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
O_RDONLY
946
| O_DIRECTORY
947
| O_PATH
948
| O_CLOEXEC));
949
if(helperdir_fd == -1){
950
perror_plus("open");
951
_exit(EX_UNAVAILABLE);
952
}
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
954
helper, O_RDONLY));
955
if(helper_fd == -1){
956
perror_plus("openat");
957
close(helperdir_fd);
958
_exit(EX_UNAVAILABLE);
959
}
960
close(helperdir_fd);
961
#ifdef __GNUC__
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
964
#endif
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
968
environ) == -1){
969
#ifdef __GNUC__
970
#pragma GCC diagnostic pop
971
#endif
972
perror_plus("fexecve");
973
_exit(EXIT_FAILURE);
974
}
975
}
976
if(pid == -1){
977
perror_plus("fork");
978
return false;
979
}
980
int status;
981
pid_t pret = -1;
982
errno = 0;
983
do {
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
991
}
992
if(kill(pid, SIGTERM) == -1){
993
perror_plus("kill");
994
}
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
997
" helper program");
998
}
999
return false;
1000
}
1001
} while(pret == -1 and errno == EINTR);
1002
if(pret == -1){
1003
perror_plus("waitpid");
1004
return false;
1005
}
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1010
return false;
1011
}
1012
return true;
1013
}
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1017
return false;
1018
}
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
return false;
1021
}
1022
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1026
if(debug){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1028
}
1029
return add_delete_local_route(true, address, if_index);
1030
}
1031
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1035
if(debug){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1037
}
1038
return add_delete_local_route(false, address, if_index);
1039
}
1040
505
1041
/* Called when a Mandos server is found */
506
static int start_mandos_communication(const char *ip, uint16_t port,
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
507
1044
AvahiIfIndex if_index,
508
mandos_context *mc){
509
int ret, tcp_sd;
1045
int af, mandos_context *mc){
1046
int ret, tcp_sd = -1;
510
1047
ssize_t sret;
511
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1048
struct sockaddr_storage to;
512
1049
char *buffer = NULL;
513
char *decrypted_buffer;
1050
char *decrypted_buffer = NULL;
514
1051
size_t buffer_length = 0;
515
1052
size_t buffer_capacity = 0;
516
ssize_t decrypted_buffer_size;
517
1053
size_t written;
518
int retval = 0;
519
char interface[IF_NAMESIZE];
1054
int retval = -1;
520
1055
gnutls_session_t session;
521
522
ret = init_gnutls_session(mc, &session);
1056
int pf; /* Protocol family */
1057
bool route_added = false;
1058
1059
errno = 0;
1060
1061
if(quit_now){
1062
errno = EINTR;
1063
return -1;
1064
}
1065
1066
switch(af){
1067
case AF_INET6:
1068
pf = PF_INET6;
1069
break;
1070
case AF_INET:
1071
pf = PF_INET;
1072
break;
1073
default:
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
1075
errno = EINVAL;
1076
return -1;
1077
}
1078
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1082
bool match = false;
1083
{
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1086
interface))){
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1088
match = true;
1089
break;
1090
}
1091
}
1092
}
1093
if(not match){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1096
if(debug){
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1100
} else {
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1102
" \"%s\"\n",
1103
if_indextoname((unsigned int)if_index,
1104
interface));
1105
}
1106
}
1107
return -1;
1108
}
1109
}
1110
1111
ret = init_gnutls_session(&session, mc);
523
1112
if(ret != 0){
524
1113
return -1;
525
1114
}
526
1115
527
1116
if(debug){
528
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
529
"\n", ip, port);
530
}
531
532
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
533
if(tcp_sd < 0) {
534
perror("socket");
535
return -1;
536
}
537
538
if(debug){
539
if(if_indextoname((unsigned int)if_index, interface) == NULL){
540
perror("if_indextoname");
541
return -1;
542
}
543
fprintf(stderr, "Binding to interface %s\n", interface);
544
}
545
546
memset(&to, 0, sizeof(to));
547
to.in6.sin6_family = AF_INET6;
548
/* It would be nice to have a way to detect if we were passed an
549
IPv4 address here. Now we assume an IPv6 address. */
550
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
1119
}
1120
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1122
if(tcp_sd < 0){
1123
int e = errno;
1124
perror_plus("socket");
1125
errno = e;
1126
goto mandos_end;
1127
}
1128
1129
if(quit_now){
1130
errno = EINTR;
1131
goto mandos_end;
1132
}
1133
1134
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
1138
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
1142
}
551
1143
if(ret < 0 ){
552
perror("inet_pton");
553
return -1;
1144
int e = errno;
1145
perror_plus("inet_pton");
1146
errno = e;
1147
goto mandos_end;
554
1148
}
555
1149
if(ret == 0){
556
fprintf(stderr, "Bad address: %s\n", ip);
557
return -1;
558
}
559
to.in6.sin6_port = htons(port); /* Spurious warnings from
560
-Wconversion and
561
-Wunreachable-code */
1150
int e = errno;
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
1152
errno = e;
1153
goto mandos_end;
1154
}
1155
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1159
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
1162
errno = EINVAL;
1163
goto mandos_end;
1164
}
1165
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1167
}
1168
} else {
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
1170
}
562
1171
563
to.in6.sin6_scope_id = (uint32_t)if_index;
1172
if(quit_now){
1173
errno = EINTR;
1174
goto mandos_end;
1175
}
564
1176
565
1177
if(debug){
566
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
567
port);
568
char addrstr[INET6_ADDRSTRLEN] = "";
569
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
570
sizeof(addrstr)) == NULL){
571
perror("inet_ntop");
572
} else {
573
if(strcmp(addrstr, ip) != 0){
574
fprintf(stderr, "Canonical address form: %s\n", addrstr);
575
}
576
}
577
}
578
579
ret = connect(tcp_sd, &to.in, sizeof(to));
580
if(ret < 0){
581
perror("connect");
582
return -1;
1178
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1179
char interface[IF_NAMESIZE];
1180
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
perror_plus("if_indextoname");
1182
} else {
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
1185
}
1186
} else {
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
1189
}
1190
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1192
if(af == AF_INET6){
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1196
NI_NUMERICHOST);
1197
} else {
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1201
NI_NUMERICHOST);
1202
}
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1209
}
1210
}
1211
1212
if(quit_now){
1213
errno = EINTR;
1214
goto mandos_end;
1215
}
1216
1217
while(true){
1218
if(af == AF_INET6){
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1221
} else {
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1224
}
1225
if(ret < 0){
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1232
&to)->sin6_addr)))
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1243
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1247
*/
1248
if(debug){
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1250
" direct route\n");
1251
}
1252
int e = errno;
1253
route_added = add_local_route(ip, if_index);
1254
if(route_added){
1255
continue;
1256
}
1257
errno = e;
1258
}
1259
if(errno != ECONNREFUSED or debug){
1260
int e = errno;
1261
perror_plus("connect");
1262
errno = e;
1263
}
1264
goto mandos_end;
1265
}
1266
1267
if(quit_now){
1268
errno = EINTR;
1269
goto mandos_end;
1270
}
1271
break;
583
1272
}
584
1273
585
1274
const char *out = mandos_protocol_version;
587
1276
while(true){
588
1277
size_t out_size = strlen(out);
589
1278
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
out_size - written));
1279
out_size - written));
591
1280
if(ret == -1){
592
perror("write");
593
retval = -1;
1281
int e = errno;
1282
perror_plus("write");
1283
errno = e;
594
1284
goto mandos_end;
595
1285
}
596
1286
written += (size_t)ret;
604
1294
break;
605
1295
}
606
1296
}
1297
1298
if(quit_now){
1299
errno = EINTR;
1300
goto mandos_end;
1301
}
607
1302
}
608
1303
609
1304
if(debug){
610
fprintf(stderr, "Establishing TLS session with %s\n", ip);
611
}
612
613
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
614
615
do{
1305
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1306
}
1307
1308
if(quit_now){
1309
errno = EINTR;
1310
goto mandos_end;
1311
}
1312
1313
/* This casting via intptr_t is to eliminate warning about casting
1314
an int to a pointer type. This is exactly how the GnuTLS Guile
1315
function "set-session-transport-fd!" does it. */
1316
gnutls_transport_set_ptr(session,
1317
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1318
1319
if(quit_now){
1320
errno = EINTR;
1321
goto mandos_end;
1322
}
1323
1324
do {
616
1325
ret = gnutls_handshake(session);
1326
if(quit_now){
1327
errno = EINTR;
1328
goto mandos_end;
1329
}
617
1330
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
618
1331
619
1332
if(ret != GNUTLS_E_SUCCESS){
620
1333
if(debug){
621
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1334
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
622
1335
gnutls_perror(ret);
623
1336
}
624
retval = -1;
1337
errno = EPROTO;
625
1338
goto mandos_end;
626
1339
}
627
1340
628
1341
/* Read OpenPGP packet that contains the wanted password */
629
1342
630
1343
if(debug){
631
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
632
ip);
1344
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
1345
" %s\n", ip);
633
1346
}
634
1347
635
1348
while(true){
636
buffer_capacity = adjustbuffer(&buffer, buffer_length,
637
buffer_capacity);
1349
1350
if(quit_now){
1351
errno = EINTR;
1352
goto mandos_end;
1353
}
1354
1355
buffer_capacity = incbuffer(&buffer, buffer_length,
1356
buffer_capacity);
638
1357
if(buffer_capacity == 0){
639
perror("adjustbuffer");
640
retval = -1;
1358
int e = errno;
1359
perror_plus("incbuffer");
1360
errno = e;
1361
goto mandos_end;
1362
}
1363
1364
if(quit_now){
1365
errno = EINTR;
641
1366
goto mandos_end;
642
1367
}
643
1368
652
1377
case GNUTLS_E_AGAIN:
653
1378
break;
654
1379
case GNUTLS_E_REHANDSHAKE:
655
do{
1380
do {
656
1381
ret = gnutls_handshake(session);
1382
1383
if(quit_now){
1384
errno = EINTR;
1385
goto mandos_end;
1386
}
657
1387
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
658
1388
if(ret < 0){
659
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1389
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
1390
"***\n");
660
1391
gnutls_perror(ret);
661
retval = -1;
1392
errno = EPROTO;
662
1393
goto mandos_end;
663
1394
}
664
1395
break;
665
1396
default:
666
fprintf(stderr, "Unknown error while reading data from"
667
" encrypted session with Mandos server\n");
668
retval = -1;
1397
fprintf_plus(stderr, "Unknown error while reading data from"
1398
" encrypted session with Mandos server\n");
669
1399
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1400
errno = EIO;
670
1401
goto mandos_end;
671
1402
}
672
1403
} else {
675
1406
}
676
1407
677
1408
if(debug){
678
fprintf(stderr, "Closing TLS session\n");
679
}
680
681
gnutls_bye(session, GNUTLS_SHUT_RDWR);
1409
fprintf_plus(stderr, "Closing TLS session\n");
1410
}
1411
1412
if(quit_now){
1413
errno = EINTR;
1414
goto mandos_end;
1415
}
1416
1417
do {
1418
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1419
if(quit_now){
1420
errno = EINTR;
1421
goto mandos_end;
1422
}
1423
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
682
1424
683
1425
if(buffer_length > 0){
684
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
685
buffer_length,
686
&decrypted_buffer);
1426
ssize_t decrypted_buffer_size;
1427
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1428
&decrypted_buffer, mc);
687
1429
if(decrypted_buffer_size >= 0){
1430
688
1431
written = 0;
689
1432
while(written < (size_t) decrypted_buffer_size){
1433
if(quit_now){
1434
errno = EINTR;
1435
goto mandos_end;
1436
}
1437
690
1438
ret = (int)fwrite(decrypted_buffer + written, 1,
691
1439
(size_t)decrypted_buffer_size - written,
692
1440
stdout);
693
1441
if(ret == 0 and ferror(stdout)){
1442
int e = errno;
694
1443
if(debug){
695
fprintf(stderr, "Error writing encrypted data: %s\n",
696
strerror(errno));
1444
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
1445
strerror(errno));
697
1446
}
698
retval = -1;
699
break;
1447
errno = e;
1448
goto mandos_end;
700
1449
}
701
1450
written += (size_t)ret;
702
1451
}
703
free(decrypted_buffer);
704
} else {
705
retval = -1;
1452
retval = 0;
706
1453
}
707
} else {
708
retval = -1;
709
1454
}
710
1455
711
1456
/* Shutdown procedure */
712
1457
713
1458
mandos_end:
714
free(buffer);
715
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
716
if(ret == -1){
717
perror("close");
1459
{
1460
if(route_added){
1461
if(not delete_local_route(ip, if_index)){
1462
fprintf_plus(stderr, "Failed to delete local route to %s on"
1463
" interface %d", ip, if_index);
1464
}
1465
}
1466
int e = errno;
1467
free(decrypted_buffer);
1468
free(buffer);
1469
if(tcp_sd >= 0){
1470
ret = close(tcp_sd);
1471
}
1472
if(ret == -1){
1473
if(e == 0){
1474
e = errno;
1475
}
1476
perror_plus("close");
1477
}
1478
gnutls_deinit(session);
1479
errno = e;
1480
if(quit_now){
1481
errno = EINTR;
1482
retval = -1;
1483
}
718
1484
}
719
gnutls_deinit(session);
720
1485
return retval;
721
1486
}
722
1487
1488
__attribute__((nonnull))
723
1489
static void resolve_callback(AvahiSServiceResolver *r,
724
1490
AvahiIfIndex interface,
725
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1491
AvahiProtocol proto,
726
1492
AvahiResolverEvent event,
727
1493
const char *name,
728
1494
const char *type,
733
1499
AVAHI_GCC_UNUSED AvahiStringList *txt,
734
1500
AVAHI_GCC_UNUSED AvahiLookupResultFlags
735
1501
flags,
736
void* userdata) {
737
mandos_context *mc = userdata;
738
assert(r);
1502
void *mc){
1503
if(r == NULL){
1504
return;
1505
}
739
1506
740
1507
/* Called whenever a service has been resolved successfully or
741
1508
timed out */
742
1509
743
switch(event) {
1510
if(quit_now){
1511
avahi_s_service_resolver_free(r);
1512
return;
1513
}
1514
1515
switch(event){
744
1516
default:
745
1517
case AVAHI_RESOLVER_FAILURE:
746
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
" of type '%s' in domain '%s': %s\n", name, type, domain,
748
avahi_strerror(avahi_server_errno(mc->server)));
1518
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1519
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1520
domain,
1521
avahi_strerror(avahi_server_errno
1522
(((mandos_context*)mc)->server)));
749
1523
break;
750
1524
751
1525
case AVAHI_RESOLVER_FOUND:
753
1527
char ip[AVAHI_ADDRESS_STR_MAX];
754
1528
avahi_address_snprint(ip, sizeof(ip), address);
755
1529
if(debug){
756
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
757
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
758
ip, (intmax_t)interface, port);
1530
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1531
PRIdMAX ") on port %" PRIu16 "\n", name,
1532
host_name, ip, (intmax_t)interface, port);
759
1533
}
760
int ret = start_mandos_communication(ip, port, interface, mc);
1534
int ret = start_mandos_communication(ip, (in_port_t)port,
1535
interface,
1536
avahi_proto_to_af(proto),
1537
mc);
761
1538
if(ret == 0){
762
avahi_simple_poll_quit(mc->simple_poll);
1539
avahi_simple_poll_quit(simple_poll);
1540
} else {
1541
if(not add_server(ip, (in_port_t)port, interface,
1542
avahi_proto_to_af(proto),
1543
&((mandos_context*)mc)->current_server)){
1544
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1545
" list\n", name);
1546
}
763
1547
}
764
1548
}
765
1549
}
766
1550
avahi_s_service_resolver_free(r);
767
1551
}
768
1552
769
static void browse_callback( AvahiSServiceBrowser *b,
770
AvahiIfIndex interface,
771
AvahiProtocol protocol,
772
AvahiBrowserEvent event,
773
const char *name,
774
const char *type,
775
const char *domain,
776
AVAHI_GCC_UNUSED AvahiLookupResultFlags
777
flags,
778
void* userdata) {
779
mandos_context *mc = userdata;
780
assert(b);
1553
static void browse_callback(AvahiSServiceBrowser *b,
1554
AvahiIfIndex interface,
1555
AvahiProtocol protocol,
1556
AvahiBrowserEvent event,
1557
const char *name,
1558
const char *type,
1559
const char *domain,
1560
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1561
flags,
1562
void *mc){
1563
if(b == NULL){
1564
return;
1565
}
781
1566
782
1567
/* Called whenever a new services becomes available on the LAN or
783
1568
is removed from the LAN */
784
1569
785
switch(event) {
1570
if(quit_now){
1571
return;
1572
}
1573
1574
switch(event){
786
1575
default:
787
1576
case AVAHI_BROWSER_FAILURE:
788
1577
789
fprintf(stderr, "(Avahi browser) %s\n",
790
avahi_strerror(avahi_server_errno(mc->server)));
791
avahi_simple_poll_quit(mc->simple_poll);
1578
fprintf_plus(stderr, "(Avahi browser) %s\n",
1579
avahi_strerror(avahi_server_errno
1580
(((mandos_context*)mc)->server)));
1581
avahi_simple_poll_quit(simple_poll);
792
1582
return;
793
1583
794
1584
case AVAHI_BROWSER_NEW:
797
1587
the callback function is called the Avahi server will free the
798
1588
resolver for us. */
799
1589
800
if(!(avahi_s_service_resolver_new(mc->server, interface,
801
protocol, name, type, domain,
802
AVAHI_PROTO_INET6, 0,
803
resolve_callback, mc)))
804
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
805
name, avahi_strerror(avahi_server_errno(mc->server)));
1590
if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,
1591
interface, protocol, name, type,
1592
domain, protocol, 0,
1593
resolve_callback, mc) == NULL)
1594
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1595
" %s\n", name,
1596
avahi_strerror(avahi_server_errno
1597
(((mandos_context*)mc)->server)));
806
1598
break;
807
1599
808
1600
case AVAHI_BROWSER_REMOVE:
811
1603
case AVAHI_BROWSER_ALL_FOR_NOW:
812
1604
case AVAHI_BROWSER_CACHE_EXHAUSTED:
813
1605
if(debug){
814
fprintf(stderr, "No Mandos server found, still searching...\n");
1606
fprintf_plus(stderr, "No Mandos server found, still"
1607
" searching...\n");
815
1608
}
816
1609
break;
817
1610
}
818
1611
}
819
1612
1613
/* Signal handler that stops main loop after SIGTERM */
1614
static void handle_sigterm(int sig){
1615
if(quit_now){
1616
return;
1617
}
1618
quit_now = 1;
1619
signal_received = sig;
1620
int old_errno = errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1624
}
1625
errno = old_errno;
1626
}
1627
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1630
int ret;
1631
error_t ret_errno;
1632
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1634
if(s < 0){
1635
ret_errno = errno;
1636
perror_plus("socket");
1637
errno = ret_errno;
1638
return false;
1639
}
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1643
if(ret == -1){
1644
if(debug){
1645
ret_errno = errno;
1646
perror_plus("ioctl SIOCGIFFLAGS");
1647
errno = ret_errno;
1648
}
1649
return false;
1650
}
1651
return true;
1652
}
1653
1654
__attribute__((nonnull, warn_unused_result))
1655
bool good_flags(const char *ifname, const struct ifreq *ifr){
1656
1657
/* Reject the loopback device */
1658
if(ifr->ifr_flags & IFF_LOOPBACK){
1659
if(debug){
1660
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1661
ifname);
1662
}
1663
return false;
1664
}
1665
/* Accept point-to-point devices only if connect_to is specified */
1666
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1667
if(debug){
1668
fprintf_plus(stderr, "Accepting point-to-point interface"
1669
" \"%s\"\n", ifname);
1670
}
1671
return true;
1672
}
1673
/* Otherwise, reject non-broadcast-capable devices */
1674
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1675
if(debug){
1676
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1677
" \"%s\"\n", ifname);
1678
}
1679
return false;
1680
}
1681
/* Reject non-ARP interfaces (including dummy interfaces) */
1682
if(ifr->ifr_flags & IFF_NOARP){
1683
if(debug){
1684
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1685
ifname);
1686
}
1687
return false;
1688
}
1689
1690
/* Accept this device */
1691
if(debug){
1692
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1693
}
1694
return true;
1695
}
1696
1697
/*
1698
* This function determines if a directory entry in /sys/class/net
1699
* corresponds to an acceptable network device.
1700
* (This function is passed to scandir(3) as a filter function.)
1701
*/
1702
__attribute__((nonnull, warn_unused_result))
1703
int good_interface(const struct dirent *if_entry){
1704
if(if_entry->d_name[0] == '.'){
1705
return 0;
1706
}
1707
1708
struct ifreq ifr;
1709
if(not get_flags(if_entry->d_name, &ifr)){
1710
if(debug){
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", if_entry->d_name);
1713
}
1714
return 0;
1715
}
1716
1717
if(not good_flags(if_entry->d_name, &ifr)){
1718
return 0;
1719
}
1720
return 1;
1721
}
1722
1723
/*
1724
* This function determines if a network interface is up.
1725
*/
1726
__attribute__((nonnull, warn_unused_result))
1727
bool interface_is_up(const char *interface){
1728
struct ifreq ifr;
1729
if(not get_flags(interface, &ifr)){
1730
if(debug){
1731
fprintf_plus(stderr, "Failed to get flags for interface "
1732
"\"%s\"\n", interface);
1733
}
1734
return false;
1735
}
1736
1737
return (bool)(ifr.ifr_flags & IFF_UP);
1738
}
1739
1740
/*
1741
* This function determines if a network interface is running
1742
*/
1743
__attribute__((nonnull, warn_unused_result))
1744
bool interface_is_running(const char *interface){
1745
struct ifreq ifr;
1746
if(not get_flags(interface, &ifr)){
1747
if(debug){
1748
fprintf_plus(stderr, "Failed to get flags for interface "
1749
"\"%s\"\n", interface);
1750
}
1751
return false;
1752
}
1753
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1755
}
1756
1757
__attribute__((nonnull, pure, warn_unused_result))
1758
int notdotentries(const struct dirent *direntry){
1759
/* Skip "." and ".." */
1760
if(direntry->d_name[0] == '.'
1761
and (direntry->d_name[1] == '\0'
1762
or (direntry->d_name[1] == '.'
1763
and direntry->d_name[2] == '\0'))){
1764
return 0;
1765
}
1766
return 1;
1767
}
1768
1769
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
int runnable_hook(const struct dirent *direntry){
1772
int ret;
1773
size_t sret;
1774
struct stat st;
1775
1776
if((direntry->d_name)[0] == '\0'){
1777
/* Empty name? */
1778
return 0;
1779
}
1780
1781
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
"abcdefghijklmnopqrstuvwxyz"
1783
"0123456789"
1784
"_.-");
1785
if((direntry->d_name)[sret] != '\0'){
1786
/* Contains non-allowed characters */
1787
if(debug){
1788
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1789
direntry->d_name);
1790
}
1791
return 0;
1792
}
1793
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1795
if(ret == -1){
1796
if(debug){
1797
perror_plus("Could not stat hook");
1798
}
1799
return 0;
1800
}
1801
if(not (S_ISREG(st.st_mode))){
1802
/* Not a regular file */
1803
if(debug){
1804
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1805
direntry->d_name);
1806
}
1807
return 0;
1808
}
1809
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1810
/* Not executable */
1811
if(debug){
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1813
direntry->d_name);
1814
}
1815
return 0;
1816
}
1817
if(debug){
1818
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1819
direntry->d_name);
1820
}
1821
return 1;
1822
}
1823
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1827
int ret;
1828
struct timespec now;
1829
struct timespec waited_time;
1830
intmax_t block_time;
1831
1832
while(true){
1833
if(mc->current_server == NULL){
1834
if(debug){
1835
fprintf_plus(stderr, "Wait until first server is found."
1836
" No timeout!\n");
1837
}
1838
ret = avahi_simple_poll_iterate(s, -1);
1839
} else {
1840
if(debug){
1841
fprintf_plus(stderr, "Check current_server if we should run"
1842
" it, or wait\n");
1843
}
1844
/* the current time */
1845
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1846
if(ret == -1){
1847
perror_plus("clock_gettime");
1848
return -1;
1849
}
1850
/* Calculating in ms how long time between now and server
1851
who we visted longest time ago. Now - last seen. */
1852
waited_time.tv_sec = (now.tv_sec
1853
- mc->current_server->last_seen.tv_sec);
1854
waited_time.tv_nsec = (now.tv_nsec
1855
- mc->current_server->last_seen.tv_nsec);
1856
/* total time is 10s/10,000ms.
1857
Converting to s from ms by dividing by 1,000,
1858
and ns to ms by dividing by 1,000,000. */
1859
block_time = ((retry_interval
1860
- ((intmax_t)waited_time.tv_sec * 1000))
1861
- ((intmax_t)waited_time.tv_nsec / 1000000));
1862
1863
if(debug){
1864
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1865
block_time);
1866
}
1867
1868
if(block_time <= 0){
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1873
if(ret == 0){
1874
avahi_simple_poll_quit(s);
1875
return 0;
1876
}
1877
ret = clock_gettime(CLOCK_MONOTONIC,
1878
&mc->current_server->last_seen);
1879
if(ret == -1){
1880
perror_plus("clock_gettime");
1881
return -1;
1882
}
1883
mc->current_server = mc->current_server->next;
1884
block_time = 0; /* Call avahi to find new Mandos
1885
servers, but don't block */
1886
}
1887
1888
ret = avahi_simple_poll_iterate(s, (int)block_time);
1889
}
1890
if(ret != 0){
1891
if(ret > 0 or errno != EINTR){
1892
return (ret != 1) ? ret : 0;
1893
}
1894
}
1895
}
1896
}
1897
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1900
const float delay){
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1904
| O_CLOEXEC);
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1907
if(debug){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1910
}
1911
} else {
1912
perror_plus("open");
1913
}
1914
return;
1915
}
1916
}
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1919
if(numhooks == -1){
1920
perror_plus("scandir");
1921
return;
1922
}
1923
struct dirent *direntry;
1924
int ret;
1925
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1926
if(devnull == -1){
1927
perror_plus("open(\"/dev/null\", O_RDONLY)");
1928
return;
1929
}
1930
for(int i = 0; i < numhooks; i++){
1931
direntry = direntries[i];
1932
if(debug){
1933
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1934
direntry->d_name);
1935
}
1936
pid_t hook_pid = fork();
1937
if(hook_pid == 0){
1938
/* Child */
1939
/* Raise privileges */
1940
errno = raise_privileges_permanently();
1941
if(errno != 0){
1942
perror_plus("Failed to raise privileges");
1943
_exit(EX_NOPERM);
1944
}
1945
/* Set group */
1946
errno = 0;
1947
ret = setgid(0);
1948
if(ret == -1){
1949
perror_plus("setgid");
1950
_exit(EX_NOPERM);
1951
}
1952
/* Reset supplementary groups */
1953
errno = 0;
1954
ret = setgroups(0, NULL);
1955
if(ret == -1){
1956
perror_plus("setgroups");
1957
_exit(EX_NOPERM);
1958
}
1959
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1960
if(ret == -1){
1961
perror_plus("setenv");
1962
_exit(EX_OSERR);
1963
}
1964
ret = setenv("DEVICE", interface, 1);
1965
if(ret == -1){
1966
perror_plus("setenv");
1967
_exit(EX_OSERR);
1968
}
1969
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1970
if(ret == -1){
1971
perror_plus("setenv");
1972
_exit(EX_OSERR);
1973
}
1974
ret = setenv("MODE", mode, 1);
1975
if(ret == -1){
1976
perror_plus("setenv");
1977
_exit(EX_OSERR);
1978
}
1979
char *delaystring;
1980
ret = asprintf(&delaystring, "%f", (double)delay);
1981
if(ret == -1){
1982
perror_plus("asprintf");
1983
_exit(EX_OSERR);
1984
}
1985
ret = setenv("DELAY", delaystring, 1);
1986
if(ret == -1){
1987
free(delaystring);
1988
perror_plus("setenv");
1989
_exit(EX_OSERR);
1990
}
1991
free(delaystring);
1992
if(connect_to != NULL){
1993
ret = setenv("CONNECT", connect_to, 1);
1994
if(ret == -1){
1995
perror_plus("setenv");
1996
_exit(EX_OSERR);
1997
}
1998
}
1999
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2000
direntry->d_name,
2001
O_RDONLY));
2002
if(hook_fd == -1){
2003
perror_plus("openat");
2004
_exit(EXIT_FAILURE);
2005
}
2006
if(close(hookdir_fd) == -1){
2007
perror_plus("close");
2008
_exit(EXIT_FAILURE);
2009
}
2010
ret = dup2(devnull, STDIN_FILENO);
2011
if(ret == -1){
2012
perror_plus("dup2(devnull, STDIN_FILENO)");
2013
_exit(EX_OSERR);
2014
}
2015
ret = close(devnull);
2016
if(ret == -1){
2017
perror_plus("close");
2018
_exit(EX_OSERR);
2019
}
2020
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2021
if(ret == -1){
2022
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2023
_exit(EX_OSERR);
2024
}
2025
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2026
environ) == -1){
2027
perror_plus("fexecve");
2028
_exit(EXIT_FAILURE);
2029
}
2030
} else {
2031
if(hook_pid == -1){
2032
perror_plus("fork");
2033
free(direntry);
2034
continue;
2035
}
2036
int status;
2037
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2038
perror_plus("waitpid");
2039
free(direntry);
2040
continue;
2041
}
2042
if(WIFEXITED(status)){
2043
if(WEXITSTATUS(status) != 0){
2044
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2045
" with status %d\n", direntry->d_name,
2046
WEXITSTATUS(status));
2047
free(direntry);
2048
continue;
2049
}
2050
} else if(WIFSIGNALED(status)){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2052
" signal %d\n", direntry->d_name,
2053
WTERMSIG(status));
2054
free(direntry);
2055
continue;
2056
} else {
2057
fprintf_plus(stderr, "Warning: network hook \"%s\""
2058
" crashed\n", direntry->d_name);
2059
free(direntry);
2060
continue;
2061
}
2062
}
2063
if(debug){
2064
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2065
direntry->d_name);
2066
}
2067
free(direntry);
2068
}
2069
free(direntries);
2070
if(close(hookdir_fd) == -1){
2071
perror_plus("close");
2072
} else {
2073
hookdir_fd = -1;
2074
}
2075
close(devnull);
2076
}
2077
2078
__attribute__((nonnull, warn_unused_result))
2079
error_t bring_up_interface(const char *const interface,
2080
const float delay){
2081
error_t old_errno = errno;
2082
int ret;
2083
struct ifreq network;
2084
unsigned int if_index = if_nametoindex(interface);
2085
if(if_index == 0){
2086
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2087
errno = old_errno;
2088
return ENXIO;
2089
}
2090
2091
if(quit_now){
2092
errno = old_errno;
2093
return EINTR;
2094
}
2095
2096
if(not interface_is_up(interface)){
2097
error_t ret_errno = 0, ioctl_errno = 0;
2098
if(not get_flags(interface, &network)){
2099
ret_errno = errno;
2100
fprintf_plus(stderr, "Failed to get flags for interface "
2101
"\"%s\"\n", interface);
2102
errno = old_errno;
2103
return ret_errno;
2104
}
2105
network.ifr_flags |= IFF_UP; /* set flag */
2106
2107
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2108
if(sd == -1){
2109
ret_errno = errno;
2110
perror_plus("socket");
2111
errno = old_errno;
2112
return ret_errno;
2113
}
2114
2115
if(quit_now){
2116
ret = close(sd);
2117
if(ret == -1){
2118
perror_plus("close");
2119
}
2120
errno = old_errno;
2121
return EINTR;
2122
}
2123
2124
if(debug){
2125
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2126
interface);
2127
}
2128
2129
/* Raise privileges */
2130
ret_errno = raise_privileges();
2131
if(ret_errno != 0){
2132
errno = ret_errno;
2133
perror_plus("Failed to raise privileges");
2134
}
2135
2136
#ifdef __linux__
2137
int ret_linux;
2138
bool restore_loglevel = false;
2139
if(ret_errno == 0){
2140
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2141
messages about the network interface to mess up the prompt */
2142
ret_linux = klogctl(8, NULL, 5);
2143
if(ret_linux == -1){
2144
perror_plus("klogctl");
2145
} else {
2146
restore_loglevel = true;
2147
}
2148
}
2149
#endif /* __linux__ */
2150
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2151
ioctl_errno = errno;
2152
#ifdef __linux__
2153
if(restore_loglevel){
2154
ret_linux = klogctl(7, NULL, 0);
2155
if(ret_linux == -1){
2156
perror_plus("klogctl");
2157
}
2158
}
2159
#endif /* __linux__ */
2160
2161
/* If raise_privileges() succeeded above */
2162
if(ret_errno == 0){
2163
/* Lower privileges */
2164
ret_errno = lower_privileges();
2165
if(ret_errno != 0){
2166
errno = ret_errno;
2167
perror_plus("Failed to lower privileges");
2168
}
2169
}
2170
2171
/* Close the socket */
2172
ret = close(sd);
2173
if(ret == -1){
2174
perror_plus("close");
2175
}
2176
2177
if(ret_setflags == -1){
2178
errno = ioctl_errno;
2179
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2180
errno = old_errno;
2181
return ioctl_errno;
2182
}
2183
} else if(debug){
2184
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2185
interface);
2186
}
2187
2188
/* Sleep checking until interface is running.
2189
Check every 0.25s, up to total time of delay */
2190
for(int i=0; i < delay * 4; i++){
2191
if(interface_is_running(interface)){
2192
break;
2193
}
2194
struct timespec sleeptime = { .tv_nsec = 250000000 };
2195
ret = nanosleep(&sleeptime, NULL);
2196
if(ret == -1 and errno != EINTR){
2197
perror_plus("nanosleep");
2198
}
2199
}
2200
2201
errno = old_errno;
2202
return 0;
2203
}
2204
2205
__attribute__((nonnull, warn_unused_result))
2206
error_t take_down_interface(const char *const interface){
2207
error_t old_errno = errno;
2208
struct ifreq network;
2209
unsigned int if_index = if_nametoindex(interface);
2210
if(if_index == 0){
2211
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2212
errno = old_errno;
2213
return ENXIO;
2214
}
2215
if(interface_is_up(interface)){
2216
error_t ret_errno = 0, ioctl_errno = 0;
2217
if(not get_flags(interface, &network) and debug){
2218
ret_errno = errno;
2219
fprintf_plus(stderr, "Failed to get flags for interface "
2220
"\"%s\"\n", interface);
2221
errno = old_errno;
2222
return ret_errno;
2223
}
2224
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2225
2226
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2227
if(sd == -1){
2228
ret_errno = errno;
2229
perror_plus("socket");
2230
errno = old_errno;
2231
return ret_errno;
2232
}
2233
2234
if(debug){
2235
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2236
interface);
2237
}
2238
2239
/* Raise privileges */
2240
ret_errno = raise_privileges();
2241
if(ret_errno != 0){
2242
errno = ret_errno;
2243
perror_plus("Failed to raise privileges");
2244
}
2245
2246
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2247
ioctl_errno = errno;
2248
2249
/* If raise_privileges() succeeded above */
2250
if(ret_errno == 0){
2251
/* Lower privileges */
2252
ret_errno = lower_privileges();
2253
if(ret_errno != 0){
2254
errno = ret_errno;
2255
perror_plus("Failed to lower privileges");
2256
}
2257
}
2258
2259
/* Close the socket */
2260
int ret = close(sd);
2261
if(ret == -1){
2262
perror_plus("close");
2263
}
2264
2265
if(ret_setflags == -1){
2266
errno = ioctl_errno;
2267
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2268
errno = old_errno;
2269
return ioctl_errno;
2270
}
2271
} else if(debug){
2272
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2273
interface);
2274
}
2275
2276
errno = old_errno;
2277
return 0;
2278
}
2279
820
2280
int main(int argc, char *argv[]){
821
AvahiSServiceBrowser *sb = NULL;
822
int error;
823
int ret;
824
intmax_t tmpmax;
825
int numchars;
826
int exitcode = EXIT_SUCCESS;
827
const char *interface = "eth0";
828
struct ifreq network;
829
int sd;
830
uid_t uid;
831
gid_t gid;
832
char *connect_to = NULL;
833
char tempdir[] = "/tmp/mandosXXXXXX";
834
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
835
const char *seckey = PATHDIR "/" SECKEY;
836
const char *pubkey = PATHDIR "/" PUBKEY;
837
838
mandos_context mc = { .simple_poll = NULL, .server = NULL,
839
.dh_bits = 1024, .priority = "SECURE256"
840
":!CTYPE-X.509:+CTYPE-OPENPGP" };
841
bool gnutls_initalized = false;
842
bool gpgme_initalized = false;
843
844
{
845
struct argp_option options[] = {
846
{ .name = "debug", .key = 128,
847
.doc = "Debug mode", .group = 3 },
848
{ .name = "connect", .key = 'c',
849
.arg = "ADDRESS:PORT",
850
.doc = "Connect directly to a specific Mandos server",
851
.group = 1 },
852
{ .name = "interface", .key = 'i',
853
.arg = "NAME",
854
.doc = "Interface that will be used to search for Mandos"
855
" servers",
856
.group = 1 },
857
{ .name = "seckey", .key = 's',
858
.arg = "FILE",
859
.doc = "OpenPGP secret key file base name",
860
.group = 1 },
861
{ .name = "pubkey", .key = 'p',
862
.arg = "FILE",
863
.doc = "OpenPGP public key file base name",
864
.group = 2 },
865
{ .name = "dh-bits", .key = 129,
866
.arg = "BITS",
867
.doc = "Bit length of the prime number used in the"
868
" Diffie-Hellman key exchange",
869
.group = 2 },
870
{ .name = "priority", .key = 130,
871
.arg = "STRING",
872
.doc = "GnuTLS priority string for the TLS handshake",
873
.group = 1 },
874
{ .name = NULL }
875
};
876
877
error_t parse_opt(int key, char *arg,
878
struct argp_state *state) {
879
switch(key) {
880
case 128: /* --debug */
881
debug = true;
882
break;
883
case 'c': /* --connect */
884
connect_to = arg;
885
break;
886
case 'i': /* --interface */
887
interface = arg;
888
break;
889
case 's': /* --seckey */
890
seckey = arg;
891
break;
892
case 'p': /* --pubkey */
893
pubkey = arg;
894
break;
895
case 129: /* --dh-bits */
896
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
897
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
898
or arg[numchars] != '\0'){
899
fprintf(stderr, "Bad number of DH bits\n");
900
exit(EXIT_FAILURE);
901
}
902
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
903
break;
904
case 130: /* --priority */
905
mc.priority = arg;
906
break;
907
case ARGP_KEY_ARG:
908
argp_usage(state);
909
case ARGP_KEY_END:
910
break;
911
default:
912
return ARGP_ERR_UNKNOWN;
913
}
914
return 0;
915
}
916
917
struct argp argp = { .options = options, .parser = parse_opt,
918
.args_doc = "",
919
.doc = "Mandos client -- Get and decrypt"
920
" passwords from a Mandos server" };
921
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
922
if(ret == ARGP_ERR_UNKNOWN){
923
fprintf(stderr, "Unknown error while parsing arguments\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
}
928
929
/* If the interface is down, bring it up */
930
{
931
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
932
if(sd < 0) {
933
perror("socket");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
strcpy(network.ifr_name, interface);
938
ret = ioctl(sd, SIOCGIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCGIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
if((network.ifr_flags & IFF_UP) == 0){
945
network.ifr_flags |= IFF_UP;
946
ret = ioctl(sd, SIOCSIFFLAGS, &network);
947
if(ret == -1){
948
perror("ioctl SIOCSIFFLAGS");
949
exitcode = EXIT_FAILURE;
950
goto end;
951
}
952
}
953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
954
if(ret == -1){
955
perror("close");
956
}
957
}
958
959
uid = getuid();
960
gid = getgid();
961
962
ret = setuid(uid);
963
if(ret == -1){
964
perror("setuid");
965
}
966
967
setgid(gid);
968
if(ret == -1){
969
perror("setgid");
970
}
971
972
ret = init_gnutls_global(&mc, pubkey, seckey);
973
if(ret == -1){
974
fprintf(stderr, "init_gnutls_global failed\n");
975
exitcode = EXIT_FAILURE;
976
goto end;
977
} else {
978
gnutls_initalized = true;
979
}
980
981
if(mkdtemp(tempdir) == NULL){
982
perror("mkdtemp");
983
tempdir[0] = '\0';
984
goto end;
985
}
986
987
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
988
fprintf(stderr, "gpgme_initalized failed\n");
989
exitcode = EXIT_FAILURE;
990
goto end;
991
} else {
992
gpgme_initalized = true;
993
}
994
995
if_index = (AvahiIfIndex) if_nametoindex(interface);
996
if(if_index == 0){
997
fprintf(stderr, "No such interface: \"%s\"\n", interface);
998
exit(EXIT_FAILURE);
999
}
1000
1001
if(connect_to != NULL){
1002
/* Connect directly, do not use Zeroconf */
1003
/* (Mainly meant for debugging) */
1004
char *address = strrchr(connect_to, ':');
1005
if(address == NULL){
1006
fprintf(stderr, "No colon in address\n");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
uint16_t port;
1011
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1012
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1013
or address[numchars+1] != '\0'){
1014
fprintf(stderr, "Bad port number\n");
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
port = (uint16_t)tmpmax;
1019
*address = '\0';
1020
address = connect_to;
1021
ret = start_mandos_communication(address, port, if_index, &mc);
1022
if(ret < 0){
1023
exitcode = EXIT_FAILURE;
1024
} else {
1025
exitcode = EXIT_SUCCESS;
1026
}
1027
goto end;
1028
}
1029
1030
if(not debug){
1031
avahi_set_log_function(empty_log);
1032
}
1033
1034
/* Initialize the pseudo-RNG for Avahi */
1035
srand((unsigned int) time(NULL));
1036
1037
/* Allocate main Avahi loop object */
1038
mc.simple_poll = avahi_simple_poll_new();
1039
if(mc.simple_poll == NULL) {
1040
fprintf(stderr, "Avahi: Failed to create simple poll"
1041
" object.\n");
1042
exitcode = EXIT_FAILURE;
1043
goto end;
1044
}
1045
1046
{
1047
AvahiServerConfig config;
1048
/* Do not publish any local Zeroconf records */
1049
avahi_server_config_init(&config);
1050
config.publish_hinfo = 0;
1051
config.publish_addresses = 0;
1052
config.publish_workstation = 0;
1053
config.publish_domain = 0;
1054
1055
/* Allocate a new server */
1056
mc.server = avahi_server_new(avahi_simple_poll_get
1057
(mc.simple_poll), &config, NULL,
1058
NULL, &error);
1059
1060
/* Free the Avahi configuration data */
1061
avahi_server_config_free(&config);
1062
}
1063
1064
/* Check if creating the Avahi server object succeeded */
1065
if(mc.server == NULL) {
1066
fprintf(stderr, "Failed to create Avahi server: %s\n",
1067
avahi_strerror(error));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Create the Avahi service browser */
1073
sb = avahi_s_service_browser_new(mc.server, if_index,
1074
AVAHI_PROTO_INET6,
1075
"_mandos._tcp", NULL, 0,
1076
browse_callback, &mc);
1077
if(sb == NULL) {
1078
fprintf(stderr, "Failed to create service browser: %s\n",
1079
avahi_strerror(avahi_server_errno(mc.server)));
1080
exitcode = EXIT_FAILURE;
1081
goto end;
1082
}
1083
1084
/* Run the main loop */
1085
2281
mandos_context mc = { .server = NULL, .dh_bits = 0,
2282
.priority = "SECURE256:!CTYPE-X.509"
2283
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2284
.current_server = NULL, .interfaces = NULL,
2285
.interfaces_size = 0 };
2286
AvahiSServiceBrowser *sb = NULL;
2287
error_t ret_errno;
2288
int ret;
2289
intmax_t tmpmax;
2290
char *tmp;
2291
int exitcode = EXIT_SUCCESS;
2292
char *interfaces_to_take_down = NULL;
2293
size_t interfaces_to_take_down_size = 0;
2294
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2295
char old_tempdir[] = "/tmp/mandosXXXXXX";
2296
char *tempdir = NULL;
2297
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2298
const char *seckey = PATHDIR "/" SECKEY;
2299
const char *pubkey = PATHDIR "/" PUBKEY;
2300
const char *dh_params_file = NULL;
2301
char *interfaces_hooks = NULL;
2302
2303
bool gnutls_initialized = false;
2304
bool gpgme_initialized = false;
2305
float delay = 2.5f;
2306
double retry_interval = 10; /* 10s between trying a server and
2307
retrying the same server again */
2308
2309
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2310
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2311
2312
uid = getuid();
2313
gid = getgid();
2314
2315
/* Lower any group privileges we might have, just to be safe */
2316
errno = 0;
2317
ret = setgid(gid);
2318
if(ret == -1){
2319
perror_plus("setgid");
2320
}
2321
2322
/* Lower user privileges (temporarily) */
2323
errno = 0;
2324
ret = seteuid(uid);
2325
if(ret == -1){
2326
perror_plus("seteuid");
2327
}
2328
2329
if(quit_now){
2330
goto end;
2331
}
2332
2333
{
2334
struct argp_option options[] = {
2335
{ .name = "debug", .key = 128,
2336
.doc = "Debug mode", .group = 3 },
2337
{ .name = "connect", .key = 'c',
2338
.arg = "ADDRESS:PORT",
2339
.doc = "Connect directly to a specific Mandos server",
2340
.group = 1 },
2341
{ .name = "interface", .key = 'i',
2342
.arg = "NAME",
2343
.doc = "Network interface that will be used to search for"
2344
" Mandos servers",
2345
.group = 1 },
2346
{ .name = "seckey", .key = 's',
2347
.arg = "FILE",
2348
.doc = "OpenPGP secret key file base name",
2349
.group = 1 },
2350
{ .name = "pubkey", .key = 'p',
2351
.arg = "FILE",
2352
.doc = "OpenPGP public key file base name",
2353
.group = 2 },
2354
{ .name = "dh-bits", .key = 129,
2355
.arg = "BITS",
2356
.doc = "Bit length of the prime number used in the"
2357
" Diffie-Hellman key exchange",
2358
.group = 2 },
2359
{ .name = "dh-params", .key = 134,
2360
.arg = "FILE",
2361
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2362
" for the Diffie-Hellman key exchange",
2363
.group = 2 },
2364
{ .name = "priority", .key = 130,
2365
.arg = "STRING",
2366
.doc = "GnuTLS priority string for the TLS handshake",
2367
.group = 1 },
2368
{ .name = "delay", .key = 131,
2369
.arg = "SECONDS",
2370
.doc = "Maximum delay to wait for interface startup",
2371
.group = 2 },
2372
{ .name = "retry", .key = 132,
2373
.arg = "SECONDS",
2374
.doc = "Retry interval used when denied by the Mandos server",
2375
.group = 2 },
2376
{ .name = "network-hook-dir", .key = 133,
2377
.arg = "DIR",
2378
.doc = "Directory where network hooks are located",
2379
.group = 2 },
2380
/*
2381
* These reproduce what we would get without ARGP_NO_HELP
2382
*/
2383
{ .name = "help", .key = '?',
2384
.doc = "Give this help list", .group = -1 },
2385
{ .name = "usage", .key = -3,
2386
.doc = "Give a short usage message", .group = -1 },
2387
{ .name = "version", .key = 'V',
2388
.doc = "Print program version", .group = -1 },
2389
{ .name = NULL }
2390
};
2391
2392
error_t parse_opt(int key, char *arg,
2393
struct argp_state *state){
2394
errno = 0;
2395
switch(key){
2396
case 128: /* --debug */
2397
debug = true;
2398
break;
2399
case 'c': /* --connect */
2400
connect_to = arg;
2401
break;
2402
case 'i': /* --interface */
2403
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2404
arg, (int)',');
2405
if(ret_errno != 0){
2406
argp_error(state, "%s", strerror(ret_errno));
2407
}
2408
break;
2409
case 's': /* --seckey */
2410
seckey = arg;
2411
break;
2412
case 'p': /* --pubkey */
2413
pubkey = arg;
2414
break;
2415
case 129: /* --dh-bits */
2416
errno = 0;
2417
tmpmax = strtoimax(arg, &tmp, 10);
2418
if(errno != 0 or tmp == arg or *tmp != '\0'
2419
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2420
argp_error(state, "Bad number of DH bits");
2421
}
2422
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2423
break;
2424
case 134: /* --dh-params */
2425
dh_params_file = arg;
2426
break;
2427
case 130: /* --priority */
2428
mc.priority = arg;
2429
break;
2430
case 131: /* --delay */
2431
errno = 0;
2432
delay = strtof(arg, &tmp);
2433
if(errno != 0 or tmp == arg or *tmp != '\0'){
2434
argp_error(state, "Bad delay");
2435
}
2436
case 132: /* --retry */
2437
errno = 0;
2438
retry_interval = strtod(arg, &tmp);
2439
if(errno != 0 or tmp == arg or *tmp != '\0'
2440
or (retry_interval * 1000) > INT_MAX
2441
or retry_interval < 0){
2442
argp_error(state, "Bad retry interval");
2443
}
2444
break;
2445
case 133: /* --network-hook-dir */
2446
hookdir = arg;
2447
break;
2448
/*
2449
* These reproduce what we would get without ARGP_NO_HELP
2450
*/
2451
case '?': /* --help */
2452
argp_state_help(state, state->out_stream,
2453
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2454
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2455
case -3: /* --usage */
2456
argp_state_help(state, state->out_stream,
2457
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2458
case 'V': /* --version */
2459
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2460
exit(argp_err_exit_status);
2461
break;
2462
default:
2463
return ARGP_ERR_UNKNOWN;
2464
}
2465
return errno;
2466
}
2467
2468
struct argp argp = { .options = options, .parser = parse_opt,
2469
.args_doc = "",
2470
.doc = "Mandos client -- Get and decrypt"
2471
" passwords from a Mandos server" };
2472
ret = argp_parse(&argp, argc, argv,
2473
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2474
switch(ret){
2475
case 0:
2476
break;
2477
case ENOMEM:
2478
default:
2479
errno = ret;
2480
perror_plus("argp_parse");
2481
exitcode = EX_OSERR;
2482
goto end;
2483
case EINVAL:
2484
exitcode = EX_USAGE;
2485
goto end;
2486
}
2487
}
2488
2489
{
2490
/* Work around Debian bug #633582:
2491
<http://bugs.debian.org/633582> */
2492
2493
/* Re-raise privileges */
2494
ret_errno = raise_privileges();
2495
if(ret_errno != 0){
2496
errno = ret_errno;
2497
perror_plus("Failed to raise privileges");
2498
} else {
2499
struct stat st;
2500
2501
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2502
int seckey_fd = open(seckey, O_RDONLY);
2503
if(seckey_fd == -1){
2504
perror_plus("open");
2505
} else {
2506
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2507
if(ret == -1){
2508
perror_plus("fstat");
2509
} else {
2510
if(S_ISREG(st.st_mode)
2511
and st.st_uid == 0 and st.st_gid == 0){
2512
ret = fchown(seckey_fd, uid, gid);
2513
if(ret == -1){
2514
perror_plus("fchown");
2515
}
2516
}
2517
}
2518
close(seckey_fd);
2519
}
2520
}
2521
2522
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2523
int pubkey_fd = open(pubkey, O_RDONLY);
2524
if(pubkey_fd == -1){
2525
perror_plus("open");
2526
} else {
2527
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2528
if(ret == -1){
2529
perror_plus("fstat");
2530
} else {
2531
if(S_ISREG(st.st_mode)
2532
and st.st_uid == 0 and st.st_gid == 0){
2533
ret = fchown(pubkey_fd, uid, gid);
2534
if(ret == -1){
2535
perror_plus("fchown");
2536
}
2537
}
2538
}
2539
close(pubkey_fd);
2540
}
2541
}
2542
2543
if(dh_params_file != NULL
2544
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2545
int dhparams_fd = open(dh_params_file, O_RDONLY);
2546
if(dhparams_fd == -1){
2547
perror_plus("open");
2548
} else {
2549
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2550
if(ret == -1){
2551
perror_plus("fstat");
2552
} else {
2553
if(S_ISREG(st.st_mode)
2554
and st.st_uid == 0 and st.st_gid == 0){
2555
ret = fchown(dhparams_fd, uid, gid);
2556
if(ret == -1){
2557
perror_plus("fchown");
2558
}
2559
}
2560
}
2561
close(dhparams_fd);
2562
}
2563
}
2564
2565
/* Lower privileges */
2566
ret_errno = lower_privileges();
2567
if(ret_errno != 0){
2568
errno = ret_errno;
2569
perror_plus("Failed to lower privileges");
2570
}
2571
}
2572
}
2573
2574
/* Remove invalid interface names (except "none") */
2575
{
2576
char *interface = NULL;
2577
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2578
interface))){
2579
if(strcmp(interface, "none") != 0
2580
and if_nametoindex(interface) == 0){
2581
if(interface[0] != '\0'){
2582
fprintf_plus(stderr, "Not using nonexisting interface"
2583
" \"%s\"\n", interface);
2584
}
2585
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2586
interface = NULL;
2587
}
2588
}
2589
}
2590
2591
/* Run network hooks */
2592
{
2593
if(mc.interfaces != NULL){
2594
interfaces_hooks = malloc(mc.interfaces_size);
2595
if(interfaces_hooks == NULL){
2596
perror_plus("malloc");
2597
goto end;
2598
}
2599
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2600
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2601
}
2602
run_network_hooks("start", interfaces_hooks != NULL ?
2603
interfaces_hooks : "", delay);
2604
}
2605
2606
if(not debug){
2607
avahi_set_log_function(empty_log);
2608
}
2609
2610
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2611
from the signal handler */
2612
/* Initialize the pseudo-RNG for Avahi */
2613
srand((unsigned int) time(NULL));
2614
simple_poll = avahi_simple_poll_new();
2615
if(simple_poll == NULL){
2616
fprintf_plus(stderr,
2617
"Avahi: Failed to create simple poll object.\n");
2618
exitcode = EX_UNAVAILABLE;
2619
goto end;
2620
}
2621
2622
sigemptyset(&sigterm_action.sa_mask);
2623
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2624
if(ret == -1){
2625
perror_plus("sigaddset");
2626
exitcode = EX_OSERR;
2627
goto end;
2628
}
2629
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2630
if(ret == -1){
2631
perror_plus("sigaddset");
2632
exitcode = EX_OSERR;
2633
goto end;
2634
}
2635
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2636
if(ret == -1){
2637
perror_plus("sigaddset");
2638
exitcode = EX_OSERR;
2639
goto end;
2640
}
2641
/* Need to check if the handler is SIG_IGN before handling:
2642
| [[info:libc:Initial Signal Actions]] |
2643
| [[info:libc:Basic Signal Handling]] |
2644
*/
2645
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2646
if(ret == -1){
2647
perror_plus("sigaction");
2648
return EX_OSERR;
2649
}
2650
if(old_sigterm_action.sa_handler != SIG_IGN){
2651
ret = sigaction(SIGINT, &sigterm_action, NULL);
2652
if(ret == -1){
2653
perror_plus("sigaction");
2654
exitcode = EX_OSERR;
2655
goto end;
2656
}
2657
}
2658
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2659
if(ret == -1){
2660
perror_plus("sigaction");
2661
return EX_OSERR;
2662
}
2663
if(old_sigterm_action.sa_handler != SIG_IGN){
2664
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2665
if(ret == -1){
2666
perror_plus("sigaction");
2667
exitcode = EX_OSERR;
2668
goto end;
2669
}
2670
}
2671
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2672
if(ret == -1){
2673
perror_plus("sigaction");
2674
return EX_OSERR;
2675
}
2676
if(old_sigterm_action.sa_handler != SIG_IGN){
2677
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2678
if(ret == -1){
2679
perror_plus("sigaction");
2680
exitcode = EX_OSERR;
2681
goto end;
2682
}
2683
}
2684
2685
/* If no interfaces were specified, make a list */
2686
if(mc.interfaces == NULL){
2687
struct dirent **direntries = NULL;
2688
/* Look for any good interfaces */
2689
ret = scandir(sys_class_net, &direntries, good_interface,
2690
alphasort);
2691
if(ret >= 1){
2692
/* Add all found interfaces to interfaces list */
2693
for(int i = 0; i < ret; ++i){
2694
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2695
direntries[i]->d_name);
2696
if(ret_errno != 0){
2697
errno = ret_errno;
2698
perror_plus("argz_add");
2699
free(direntries[i]);
2700
continue;
2701
}
2702
if(debug){
2703
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2704
direntries[i]->d_name);
2705
}
2706
free(direntries[i]);
2707
}
2708
free(direntries);
2709
} else {
2710
if(ret == 0){
2711
free(direntries);
2712
}
2713
fprintf_plus(stderr, "Could not find a network interface\n");
2714
exitcode = EXIT_FAILURE;
2715
goto end;
2716
}
2717
}
2718
2719
/* Bring up interfaces which are down, and remove any "none"s */
2720
{
2721
char *interface = NULL;
2722
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2723
interface))){
2724
/* If interface name is "none", stop bringing up interfaces.
2725
Also remove all instances of "none" from the list */
2726
if(strcmp(interface, "none") == 0){
2727
argz_delete(&mc.interfaces, &mc.interfaces_size,
2728
interface);
2729
interface = NULL;
2730
while((interface = argz_next(mc.interfaces,
2731
mc.interfaces_size, interface))){
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
2734
interface);
2735
interface = NULL;
2736
}
2737
}
2738
break;
2739
}
2740
bool interface_was_up = interface_is_up(interface);
2741
errno = bring_up_interface(interface, delay);
2742
if(not interface_was_up){
2743
if(errno != 0){
2744
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2745
" %s\n", interface, strerror(errno));
2746
} else {
2747
errno = argz_add(&interfaces_to_take_down,
2748
&interfaces_to_take_down_size,
2749
interface);
2750
if(errno != 0){
2751
perror_plus("argz_add");
2752
}
2753
}
2754
}
2755
}
2756
if(debug and (interfaces_to_take_down == NULL)){
2757
fprintf_plus(stderr, "No interfaces were brought up\n");
2758
}
2759
}
2760
2761
/* If we only got one interface, explicitly use only that one */
2762
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
1086
2763
if(debug){
1087
fprintf(stderr, "Starting Avahi loop search\n");
1088
}
1089
1090
avahi_simple_poll_loop(mc.simple_poll);
1091
2764
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2765
mc.interfaces);
2766
}
2767
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2768
}
2769
2770
if(quit_now){
2771
goto end;
2772
}
2773
2774
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2775
if(ret == -1){
2776
fprintf_plus(stderr, "init_gnutls_global failed\n");
2777
exitcode = EX_UNAVAILABLE;
2778
goto end;
2779
} else {
2780
gnutls_initialized = true;
2781
}
2782
2783
if(quit_now){
2784
goto end;
2785
}
2786
2787
/* Try /run/tmp before /tmp */
2788
tempdir = mkdtemp(run_tempdir);
2789
if(tempdir == NULL and errno == ENOENT){
2790
if(debug){
2791
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2792
run_tempdir, old_tempdir);
2793
}
2794
tempdir = mkdtemp(old_tempdir);
2795
}
2796
if(tempdir == NULL){
2797
perror_plus("mkdtemp");
2798
goto end;
2799
}
2800
2801
if(quit_now){
2802
goto end;
2803
}
2804
2805
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2806
fprintf_plus(stderr, "init_gpgme failed\n");
2807
exitcode = EX_UNAVAILABLE;
2808
goto end;
2809
} else {
2810
gpgme_initialized = true;
2811
}
2812
2813
if(quit_now){
2814
goto end;
2815
}
2816
2817
if(connect_to != NULL){
2818
/* Connect directly, do not use Zeroconf */
2819
/* (Mainly meant for debugging) */
2820
char *address = strrchr(connect_to, ':');
2821
2822
if(address == NULL){
2823
fprintf_plus(stderr, "No colon in address\n");
2824
exitcode = EX_USAGE;
2825
goto end;
2826
}
2827
2828
if(quit_now){
2829
goto end;
2830
}
2831
2832
in_port_t port;
2833
errno = 0;
2834
tmpmax = strtoimax(address+1, &tmp, 10);
2835
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2836
or tmpmax != (in_port_t)tmpmax){
2837
fprintf_plus(stderr, "Bad port number\n");
2838
exitcode = EX_USAGE;
2839
goto end;
2840
}
2841
2842
if(quit_now){
2843
goto end;
2844
}
2845
2846
port = (in_port_t)tmpmax;
2847
*address = '\0';
2848
/* Colon in address indicates IPv6 */
2849
int af;
2850
if(strchr(connect_to, ':') != NULL){
2851
af = AF_INET6;
2852
/* Accept [] around IPv6 address - see RFC 5952 */
2853
if(connect_to[0] == '[' and address[-1] == ']')
2854
{
2855
connect_to++;
2856
address[-1] = '\0';
2857
}
2858
} else {
2859
af = AF_INET;
2860
}
2861
address = connect_to;
2862
2863
if(quit_now){
2864
goto end;
2865
}
2866
2867
while(not quit_now){
2868
ret = start_mandos_communication(address, port, if_index, af,
2869
&mc);
2870
if(quit_now or ret == 0){
2871
break;
2872
}
2873
if(debug){
2874
fprintf_plus(stderr, "Retrying in %d seconds\n",
2875
(int)retry_interval);
2876
}
2877
sleep((unsigned int)retry_interval);
2878
}
2879
2880
if(not quit_now){
2881
exitcode = EXIT_SUCCESS;
2882
}
2883
2884
goto end;
2885
}
2886
2887
if(quit_now){
2888
goto end;
2889
}
2890
2891
{
2892
AvahiServerConfig config;
2893
/* Do not publish any local Zeroconf records */
2894
avahi_server_config_init(&config);
2895
config.publish_hinfo = 0;
2896
config.publish_addresses = 0;
2897
config.publish_workstation = 0;
2898
config.publish_domain = 0;
2899
2900
/* Allocate a new server */
2901
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2902
&config, NULL, NULL, &ret_errno);
2903
2904
/* Free the Avahi configuration data */
2905
avahi_server_config_free(&config);
2906
}
2907
2908
/* Check if creating the Avahi server object succeeded */
2909
if(mc.server == NULL){
2910
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2911
avahi_strerror(ret_errno));
2912
exitcode = EX_UNAVAILABLE;
2913
goto end;
2914
}
2915
2916
if(quit_now){
2917
goto end;
2918
}
2919
2920
/* Create the Avahi service browser */
2921
sb = avahi_s_service_browser_new(mc.server, if_index,
2922
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2923
NULL, 0, browse_callback,
2924
(void *)&mc);
2925
if(sb == NULL){
2926
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2927
avahi_strerror(avahi_server_errno(mc.server)));
2928
exitcode = EX_UNAVAILABLE;
2929
goto end;
2930
}
2931
2932
if(quit_now){
2933
goto end;
2934
}
2935
2936
/* Run the main loop */
2937
2938
if(debug){
2939
fprintf_plus(stderr, "Starting Avahi loop search\n");
2940
}
2941
2942
ret = avahi_loop_with_timeout(simple_poll,
2943
(int)(retry_interval * 1000), &mc);
2944
if(debug){
2945
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2946
(ret == 0) ? "successfully" : "with error");
2947
}
2948
1092
2949
end:
1093
1094
if(debug){
1095
fprintf(stderr, "%s exiting\n", argv[0]);
1096
}
1097
1098
/* Cleanup things */
1099
if(sb != NULL)
1100
avahi_s_service_browser_free(sb);
1101
1102
if(mc.server != NULL)
1103
avahi_server_free(mc.server);
1104
1105
if(mc.simple_poll != NULL)
1106
avahi_simple_poll_free(mc.simple_poll);
1107
1108
if(gnutls_initalized){
1109
gnutls_certificate_free_credentials(mc.cred);
1110
gnutls_global_deinit();
1111
gnutls_dh_params_deinit(mc.dh_params);
1112
}
1113
1114
if(gpgme_initalized){
1115
gpgme_release(mc.ctx);
1116
}
1117
1118
/* Removes the temp directory used by GPGME */
1119
if(tempdir[0] != '\0'){
1120
DIR *d;
1121
struct dirent *direntry;
1122
d = opendir(tempdir);
1123
if(d == NULL){
1124
if(errno != ENOENT){
1125
perror("opendir");
1126
}
1127
} else {
1128
while(true){
1129
direntry = readdir(d);
1130
if(direntry == NULL){
1131
break;
1132
}
1133
if(direntry->d_type == DT_REG){
1134
char *fullname = NULL;
1135
ret = asprintf(&fullname, "%s/%s", tempdir,
1136
direntry->d_name);
1137
if(ret < 0){
1138
perror("asprintf");
1139
continue;
1140
}
1141
ret = unlink(fullname);
1142
if(ret == -1){
1143
fprintf(stderr, "unlink(\"%s\"): %s",
1144
fullname, strerror(errno));
1145
}
1146
free(fullname);
1147
}
1148
}
1149
closedir(d);
1150
}
1151
ret = rmdir(tempdir);
1152
if(ret == -1 and errno != ENOENT){
1153
perror("rmdir");
1154
}
1155
}
1156
1157
return exitcode;
2950
2951
if(debug){
2952
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2953
}
2954
2955
/* Cleanup things */
2956
free(mc.interfaces);
2957
2958
if(sb != NULL)
2959
avahi_s_service_browser_free(sb);
2960
2961
if(mc.server != NULL)
2962
avahi_server_free(mc.server);
2963
2964
if(simple_poll != NULL)
2965
avahi_simple_poll_free(simple_poll);
2966
2967
if(gnutls_initialized){
2968
gnutls_certificate_free_credentials(mc.cred);
2969
gnutls_global_deinit();
2970
gnutls_dh_params_deinit(mc.dh_params);
2971
}
2972
2973
if(gpgme_initialized){
2974
gpgme_release(mc.ctx);
2975
}
2976
2977
/* Cleans up the circular linked list of Mandos servers the client
2978
has seen */
2979
if(mc.current_server != NULL){
2980
mc.current_server->prev->next = NULL;
2981
while(mc.current_server != NULL){
2982
server *next = mc.current_server->next;
2983
#ifdef __GNUC__
2984
#pragma GCC diagnostic push
2985
#pragma GCC diagnostic ignored "-Wcast-qual"
2986
#endif
2987
free((char *)(mc.current_server->ip));
2988
#ifdef __GNUC__
2989
#pragma GCC diagnostic pop
2990
#endif
2991
free(mc.current_server);
2992
mc.current_server = next;
2993
}
2994
}
2995
2996
/* Re-raise privileges */
2997
{
2998
ret_errno = raise_privileges();
2999
if(ret_errno != 0){
3000
errno = ret_errno;
3001
perror_plus("Failed to raise privileges");
3002
} else {
3003
3004
/* Run network hooks */
3005
run_network_hooks("stop", interfaces_hooks != NULL ?
3006
interfaces_hooks : "", delay);
3007
3008
/* Take down the network interfaces which were brought up */
3009
{
3010
char *interface = NULL;
3011
while((interface=argz_next(interfaces_to_take_down,
3012
interfaces_to_take_down_size,
3013
interface))){
3014
ret_errno = take_down_interface(interface);
3015
if(ret_errno != 0){
3016
errno = ret_errno;
3017
perror_plus("Failed to take down interface");
3018
}
3019
}
3020
if(debug and (interfaces_to_take_down == NULL)){
3021
fprintf_plus(stderr, "No interfaces needed to be taken"
3022
" down\n");
3023
}
3024
}
3025
}
3026
3027
ret_errno = lower_privileges_permanently();
3028
if(ret_errno != 0){
3029
errno = ret_errno;
3030
perror_plus("Failed to lower privileges permanently");
3031
}
3032
}
3033
3034
free(interfaces_to_take_down);
3035
free(interfaces_hooks);
3036
3037
/* Removes the GPGME temp directory and all files inside */
3038
if(tempdir != NULL){
3039
struct dirent **direntries = NULL;
3040
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3041
| O_NOFOLLOW
3042
| O_DIRECTORY
3043
| O_PATH));
3044
if(tempdir_fd == -1){
3045
perror_plus("open");
3046
} else {
3047
int numentries = scandirat(tempdir_fd, ".", &direntries,
3048
notdotentries, alphasort);
3049
if(numentries >= 0){
3050
for(int i = 0; i < numentries; i++){
3051
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3052
if(ret == -1){
3053
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3054
" \"%s\", 0): %s\n", tempdir,
3055
direntries[i]->d_name, strerror(errno));
3056
}
3057
free(direntries[i]);
3058
}
3059
3060
/* need to clean even if 0 because man page doesn't specify */
3061
free(direntries);
3062
if(numentries == -1){
3063
perror_plus("scandir");
3064
}
3065
ret = rmdir(tempdir);
3066
if(ret == -1 and errno != ENOENT){
3067
perror_plus("rmdir");
3068
}
3069
}
3070
close(tempdir_fd);
3071
}
3072
}
3073
3074
if(quit_now){
3075
sigemptyset(&old_sigterm_action.sa_mask);
3076
old_sigterm_action.sa_handler = SIG_DFL;
3077
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3078
&old_sigterm_action,
3079
NULL));
3080
if(ret == -1){
3081
perror_plus("sigaction");
3082
}
3083
do {
3084
ret = raise(signal_received);
3085
} while(ret != 0 and errno == EINTR);
3086
if(ret != 0){
3087
perror_plus("raise");
3088
abort();
3089
}
3090
TEMP_FAILURE_RETRY(pause());
3091
}
3092
3093
return exitcode;
1158
3094
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0