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- Committer: Teddy Hogeborn
- Date: 2011-08-07 14:49:02 UTC
- Revision ID: teddy@fukt.bsnet.se-20110807144902-ika77xz6rgaijwmw
* plugins.d/mandos-client.c (main): Do not even try to work around
Debian bug 633582 if --seckey or
--pubkey specifies a different
directory. Bug fix: Remove all
files in GPG temporary directory.
Debian bug 633582 if --seckey or
--pubkey specifies a different
directory. Bug fix: Remove all
files in GPG temporary directory.
- files added:
- DBUS-API
- debian/source
- files removed:
- debian/mandos-client.config
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
58
64
#include <assert.h> /* assert() */
59
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
69
SIOCSIFFLAGS, if_indextoname(),
63
70
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
79
#include <argp.h> /* struct argp_option, error_t, struct
71
80
argp_state, struct argp,
72
81
argp_parse(), ARGP_KEY_ARG,
73
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#ifdef __linux__
90
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
74
92
75
93
/* Avahi */
76
94
/* All Avahi types, constants and functions
89
107
gnutls_*
90
108
init_gnutls_session(),
91
109
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
93
112
GNUTLS_OPENPGP_FMT_BASE64 */
94
113
95
114
/* GPGME */
109
128
static const char mandos_protocol_version[] = "1";
110
129
const char *argp_program_version = "mandos-client " VERSION;
111
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
112
144
113
145
/* Used for passing in values through the Avahi callback functions */
114
146
typedef struct {
119
151
gnutls_dh_params_t dh_params;
120
152
const char *priority;
121
153
gpgme_ctx_t ctx;
154
server *current_server;
122
155
} mandos_context;
123
156
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
124
173
/*
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
127
176
* "buffer_length" is how much is already used.
128
177
*/
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
178
size_t incbuffer(char **buffer, size_t buffer_length,
130
179
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
132
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
182
if(buffer == NULL){
134
183
return 0;
135
184
}
136
185
buffer_capacity += BUFFER_SIZE;
138
187
return buffer_capacity;
139
188
}
140
189
190
/* Add server to set of servers to retry periodically */
191
int add_server(const char *ip, uint16_t port,
192
AvahiIfIndex if_index,
193
int af){
194
int ret;
195
server *new_server = malloc(sizeof(server));
196
if(new_server == NULL){
197
perror_plus("malloc");
198
return -1;
199
}
200
*new_server = (server){ .ip = strdup(ip),
201
.port = port,
202
.if_index = if_index,
203
.af = af };
204
if(new_server->ip == NULL){
205
perror_plus("strdup");
206
return -1;
207
}
208
/* Special case of first server */
209
if (mc.current_server == NULL){
210
new_server->next = new_server;
211
new_server->prev = new_server;
212
mc.current_server = new_server;
213
/* Place the new server last in the list */
214
} else {
215
new_server->next = mc.current_server;
216
new_server->prev = mc.current_server->prev;
217
new_server->prev->next = new_server;
218
mc.current_server->prev = new_server;
219
}
220
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
if(ret == -1){
222
perror_plus("clock_gettime");
223
return -1;
224
}
225
return 0;
226
}
227
141
228
/*
142
229
* Initialize GPGME.
143
230
*/
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
231
static bool init_gpgme(const char *seckey,
145
232
const char *pubkey, const char *tempdir){
146
int ret;
147
233
gpgme_error_t rc;
148
234
gpgme_engine_info_t engine_info;
149
235
150
236
151
237
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
238
* Helper function to insert pub and seckey to the engine keyring.
153
239
*/
154
240
bool import_key(const char *filename){
241
int ret;
155
242
int fd;
156
243
gpgme_data_t pgp_data;
157
244
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
245
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
246
if(fd == -1){
160
perror("open");
247
perror_plus("open");
161
248
return false;
162
249
}
163
250
164
251
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
252
if(rc != GPG_ERR_NO_ERROR){
166
253
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
254
gpgme_strsource(rc), gpgme_strerror(rc));
168
255
return false;
169
256
}
170
257
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
258
rc = gpgme_op_import(mc.ctx, pgp_data);
259
if(rc != GPG_ERR_NO_ERROR){
173
260
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
261
gpgme_strsource(rc), gpgme_strerror(rc));
175
262
return false;
176
263
}
177
264
178
ret = TEMP_FAILURE_RETRY(close(fd));
265
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
266
if(ret == -1){
180
perror("close");
267
perror_plus("close");
181
268
}
182
269
gpgme_data_release(pgp_data);
183
270
return true;
184
271
}
185
272
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
273
if(debug){
274
fprintf(stderr, "Initializing GPGME\n");
188
275
}
189
276
190
277
/* Init GPGME */
191
278
gpgme_check_version(NULL);
192
279
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
193
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
194
281
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
282
gpgme_strsource(rc), gpgme_strerror(rc));
196
283
return false;
197
284
}
198
285
199
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
286
/* Set GPGME home directory for the OpenPGP engine only */
287
rc = gpgme_get_engine_info(&engine_info);
288
if(rc != GPG_ERR_NO_ERROR){
202
289
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
290
gpgme_strsource(rc), gpgme_strerror(rc));
204
291
return false;
217
304
}
218
305
219
306
/* Create new GPGME "context" */
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
307
rc = gpgme_new(&(mc.ctx));
308
if(rc != GPG_ERR_NO_ERROR){
222
309
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
310
gpgme_strsource(rc), gpgme_strerror(rc));
224
311
return false;
225
312
}
226
313
227
if (not import_key(pubkey) or not import_key(seckey)){
314
if(not import_key(pubkey) or not import_key(seckey)){
228
315
return false;
229
316
}
230
317
231
return true;
318
return true;
232
319
}
233
320
234
321
/*
235
322
* Decrypt OpenPGP data.
236
323
* Returns -1 on error
237
324
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
325
static ssize_t pgp_packet_decrypt(const char *cryptotext,
326
size_t crypto_size,
327
char **plaintext){
242
328
gpgme_data_t dh_crypto, dh_plain;
243
329
gpgme_error_t rc;
244
330
ssize_t ret;
245
331
size_t plaintext_capacity = 0;
246
332
ssize_t plaintext_length = 0;
247
333
248
if (debug){
334
if(debug){
249
335
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
250
336
}
251
337
252
338
/* Create new GPGME data buffer from memory cryptotext */
253
339
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
254
340
0);
255
if (rc != GPG_ERR_NO_ERROR){
341
if(rc != GPG_ERR_NO_ERROR){
256
342
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
343
gpgme_strsource(rc), gpgme_strerror(rc));
258
344
return -1;
260
346
261
347
/* Create new empty GPGME data buffer for the plaintext */
262
348
rc = gpgme_data_new(&dh_plain);
263
if (rc != GPG_ERR_NO_ERROR){
349
if(rc != GPG_ERR_NO_ERROR){
264
350
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
351
gpgme_strsource(rc), gpgme_strerror(rc));
266
352
gpgme_data_release(dh_crypto);
269
355
270
356
/* Decrypt data from the cryptotext data buffer to the plaintext
271
357
data buffer */
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
358
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
359
if(rc != GPG_ERR_NO_ERROR){
274
360
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
361
gpgme_strsource(rc), gpgme_strerror(rc));
276
362
plaintext_length = -1;
277
if (debug){
363
if(debug){
278
364
gpgme_decrypt_result_t result;
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
365
result = gpgme_op_decrypt_result(mc.ctx);
366
if(result == NULL){
281
367
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
282
368
} else {
283
369
fprintf(stderr, "Unsupported algorithm: %s\n",
289
375
}
290
376
gpgme_recipient_t recipient;
291
377
recipient = result->recipients;
292
if(recipient){
293
while(recipient != NULL){
294
fprintf(stderr, "Public key algorithm: %s\n",
295
gpgme_pubkey_algo_name(recipient->pubkey_algo));
296
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
297
fprintf(stderr, "Secret key available: %s\n",
298
recipient->status == GPG_ERR_NO_SECKEY
299
? "No" : "Yes");
300
recipient = recipient->next;
301
}
378
while(recipient != NULL){
379
fprintf(stderr, "Public key algorithm: %s\n",
380
gpgme_pubkey_algo_name(recipient->pubkey_algo));
381
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
382
fprintf(stderr, "Secret key available: %s\n",
383
recipient->status == GPG_ERR_NO_SECKEY
384
? "No" : "Yes");
385
recipient = recipient->next;
302
386
}
303
387
}
304
388
}
310
394
}
311
395
312
396
/* Seek back to the beginning of the GPGME plaintext data buffer */
313
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
314
perror("gpgme_data_seek");
397
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
398
perror_plus("gpgme_data_seek");
315
399
plaintext_length = -1;
316
400
goto decrypt_end;
317
401
}
318
402
319
403
*plaintext = NULL;
320
404
while(true){
321
plaintext_capacity = adjustbuffer(plaintext,
405
plaintext_capacity = incbuffer(plaintext,
322
406
(size_t)plaintext_length,
323
407
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
408
if(plaintext_capacity == 0){
409
perror_plus("incbuffer");
326
410
plaintext_length = -1;
327
411
goto decrypt_end;
328
412
}
330
414
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
331
415
BUFFER_SIZE);
332
416
/* Print the data, if any */
333
if (ret == 0){
417
if(ret == 0){
334
418
/* EOF */
335
419
break;
336
420
}
337
421
if(ret < 0){
338
perror("gpgme_data_read");
422
perror_plus("gpgme_data_read");
339
423
plaintext_length = -1;
340
424
goto decrypt_end;
341
425
}
360
444
return plaintext_length;
361
445
}
362
446
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
447
static const char * safer_gnutls_strerror(int value){
448
const char *ret = gnutls_strerror(value); /* Spurious warning from
449
-Wunreachable-code */
450
if(ret == NULL)
366
451
ret = "(unknown)";
367
452
return ret;
368
453
}
373
458
fprintf(stderr, "GnuTLS: %s", string);
374
459
}
375
460
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
461
static int init_gnutls_global(const char *pubkeyfilename,
378
462
const char *seckeyfilename){
379
463
int ret;
380
464
383
467
}
384
468
385
469
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
470
if(ret != GNUTLS_E_SUCCESS){
471
fprintf(stderr, "GnuTLS global_init: %s\n",
472
safer_gnutls_strerror(ret));
389
473
return -1;
390
474
}
391
475
392
if (debug){
476
if(debug){
393
477
/* "Use a log level over 10 to enable all debugging options."
394
478
* - GnuTLS manual
395
479
*/
398
482
}
399
483
400
484
/* OpenPGP credentials */
401
gnutls_certificate_allocate_credentials(&mc->cred);
402
if (ret != GNUTLS_E_SUCCESS){
403
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
404
warning */
405
safer_gnutls_strerror(ret));
406
gnutls_global_deinit ();
485
ret = gnutls_certificate_allocate_credentials(&mc.cred);
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "GnuTLS memory error: %s\n",
488
safer_gnutls_strerror(ret));
489
gnutls_global_deinit();
407
490
return -1;
408
491
}
409
492
414
497
}
415
498
416
499
ret = gnutls_certificate_set_openpgp_key_file
417
(mc->cred, pubkeyfilename, seckeyfilename,
500
(mc.cred, pubkeyfilename, seckeyfilename,
418
501
GNUTLS_OPENPGP_FMT_BASE64);
419
if (ret != GNUTLS_E_SUCCESS) {
502
if(ret != GNUTLS_E_SUCCESS){
420
503
fprintf(stderr,
421
504
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
505
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
426
509
}
427
510
428
511
/* GnuTLS server initialization */
429
ret = gnutls_dh_params_init(&mc->dh_params);
430
if (ret != GNUTLS_E_SUCCESS) {
431
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
432
" %s\n", safer_gnutls_strerror(ret));
512
ret = gnutls_dh_params_init(&mc.dh_params);
513
if(ret != GNUTLS_E_SUCCESS){
514
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
515
" %s\n", safer_gnutls_strerror(ret));
433
516
goto globalfail;
434
517
}
435
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
436
if (ret != GNUTLS_E_SUCCESS) {
437
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
438
safer_gnutls_strerror(ret));
518
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
519
if(ret != GNUTLS_E_SUCCESS){
520
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
521
safer_gnutls_strerror(ret));
439
522
goto globalfail;
440
523
}
441
524
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
526
444
527
return 0;
445
528
446
529
globalfail:
447
530
448
gnutls_certificate_free_credentials(mc->cred);
531
gnutls_certificate_free_credentials(mc.cred);
449
532
gnutls_global_deinit();
450
gnutls_dh_params_deinit(mc->dh_params);
533
gnutls_dh_params_deinit(mc.dh_params);
451
534
return -1;
452
535
}
453
536
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
537
static int init_gnutls_session(gnutls_session_t *session){
456
538
int ret;
457
539
/* GnuTLS session creation */
458
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
540
do {
541
ret = gnutls_init(session, GNUTLS_SERVER);
542
if(quit_now){
543
return -1;
544
}
545
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
546
if(ret != GNUTLS_E_SUCCESS){
460
547
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
548
safer_gnutls_strerror(ret));
462
549
}
463
550
464
551
{
465
552
const char *err;
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
553
do {
554
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
555
if(quit_now){
556
gnutls_deinit(*session);
557
return -1;
558
}
559
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
560
if(ret != GNUTLS_E_SUCCESS){
468
561
fprintf(stderr, "Syntax error at: %s\n", err);
469
562
fprintf(stderr, "GnuTLS error: %s\n",
470
563
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
564
gnutls_deinit(*session);
472
565
return -1;
473
566
}
474
567
}
475
568
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
569
do {
570
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
571
mc.cred);
572
if(quit_now){
573
gnutls_deinit(*session);
574
return -1;
575
}
576
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
577
if(ret != GNUTLS_E_SUCCESS){
479
578
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
579
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
580
gnutls_deinit(*session);
482
581
return -1;
483
582
}
484
583
485
584
/* ignore client certificate if any. */
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
585
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
488
586
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
587
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
588
491
589
return 0;
492
590
}
498
596
/* Called when a Mandos server is found */
499
597
static int start_mandos_communication(const char *ip, uint16_t port,
500
598
AvahiIfIndex if_index,
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
599
int af){
600
int ret, tcp_sd = -1;
601
ssize_t sret;
602
union {
603
struct sockaddr_in in;
604
struct sockaddr_in6 in6;
605
} to;
504
606
char *buffer = NULL;
505
char *decrypted_buffer;
607
char *decrypted_buffer = NULL;
506
608
size_t buffer_length = 0;
507
609
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
509
610
size_t written;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
611
int retval = -1;
512
612
gnutls_session_t session;
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
613
int pf; /* Protocol family */
614
615
errno = 0;
616
617
if(quit_now){
618
errno = EINTR;
619
return -1;
620
}
621
622
switch(af){
623
case AF_INET6:
624
pf = PF_INET6;
625
break;
626
case AF_INET:
627
pf = PF_INET;
628
break;
629
default:
630
fprintf(stderr, "Bad address family: %d\n", af);
631
errno = EINVAL;
632
return -1;
633
}
634
635
ret = init_gnutls_session(&session);
636
if(ret != 0){
516
637
return -1;
517
638
}
518
639
519
640
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
641
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
521
642
"\n", ip, port);
522
643
}
523
644
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
526
perror("socket");
527
return -1;
645
tcp_sd = socket(pf, SOCK_STREAM, 0);
646
if(tcp_sd < 0){
647
int e = errno;
648
perror_plus("socket");
649
errno = e;
650
goto mandos_end;
528
651
}
529
652
530
if(debug){
531
if(if_indextoname((unsigned int)if_index, interface) == NULL){
532
perror("if_indextoname");
533
return -1;
534
}
535
fprintf(stderr, "Binding to interface %s\n", interface);
653
if(quit_now){
654
errno = EINTR;
655
goto mandos_end;
536
656
}
537
657
538
658
memset(&to, 0, sizeof(to));
539
to.in6.sin6_family = AF_INET6;
540
/* It would be nice to have a way to detect if we were passed an
541
IPv4 address here. Now we assume an IPv6 address. */
542
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
543
if (ret < 0 ){
544
perror("inet_pton");
545
return -1;
659
if(af == AF_INET6){
660
to.in6.sin6_family = (sa_family_t)af;
661
ret = inet_pton(af, ip, &to.in6.sin6_addr);
662
} else { /* IPv4 */
663
to.in.sin_family = (sa_family_t)af;
664
ret = inet_pton(af, ip, &to.in.sin_addr);
665
}
666
if(ret < 0 ){
667
int e = errno;
668
perror_plus("inet_pton");
669
errno = e;
670
goto mandos_end;
546
671
}
547
672
if(ret == 0){
673
int e = errno;
548
674
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
675
errno = e;
676
goto mandos_end;
677
}
678
if(af == AF_INET6){
679
to.in6.sin6_port = htons(port); /* Spurious warnings from
680
-Wconversion and
681
-Wunreachable-code */
682
683
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
684
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
685
-Wunreachable-code*/
686
if(if_index == AVAHI_IF_UNSPEC){
687
fprintf(stderr, "An IPv6 link-local address is incomplete"
688
" without a network interface\n");
689
errno = EINVAL;
690
goto mandos_end;
691
}
692
/* Set the network interface number as scope */
693
to.in6.sin6_scope_id = (uint32_t)if_index;
694
}
695
} else {
696
to.in.sin_port = htons(port); /* Spurious warnings from
697
-Wconversion and
698
-Wunreachable-code */
699
}
552
700
553
to.in6.sin6_scope_id = (uint32_t)if_index;
701
if(quit_now){
702
errno = EINTR;
703
goto mandos_end;
704
}
554
705
555
706
if(debug){
556
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
557
port);
558
char addrstr[INET6_ADDRSTRLEN] = "";
559
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
560
sizeof(addrstr)) == NULL){
561
perror("inet_ntop");
707
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
711
} else {
712
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
713
ip, interface, port);
714
}
715
} else {
716
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
717
port);
718
}
719
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
720
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
721
const char *pcret;
722
if(af == AF_INET6){
723
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
724
sizeof(addrstr));
725
} else {
726
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
727
sizeof(addrstr));
728
}
729
if(pcret == NULL){
730
perror_plus("inet_ntop");
562
731
} else {
563
732
if(strcmp(addrstr, ip) != 0){
564
733
fprintf(stderr, "Canonical address form: %s\n", addrstr);
566
735
}
567
736
}
568
737
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
571
perror("connect");
572
return -1;
738
if(quit_now){
739
errno = EINTR;
740
goto mandos_end;
741
}
742
743
if(af == AF_INET6){
744
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
} else {
746
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
747
}
748
if(ret < 0){
749
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
int e = errno;
751
perror_plus("connect");
752
errno = e;
753
}
754
goto mandos_end;
755
}
756
757
if(quit_now){
758
errno = EINTR;
759
goto mandos_end;
573
760
}
574
761
575
762
const char *out = mandos_protocol_version;
576
763
written = 0;
577
while (true){
764
while(true){
578
765
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
767
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
768
if(ret == -1){
769
int e = errno;
770
perror_plus("write");
771
errno = e;
584
772
goto mandos_end;
585
773
}
586
774
written += (size_t)ret;
587
775
if(written < out_size){
588
776
continue;
589
777
} else {
590
if (out == mandos_protocol_version){
778
if(out == mandos_protocol_version){
591
779
written = 0;
592
780
out = "\r\n";
593
781
} else {
594
782
break;
595
783
}
596
784
}
785
786
if(quit_now){
787
errno = EINTR;
788
goto mandos_end;
789
}
597
790
}
598
791
599
792
if(debug){
600
793
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
794
}
602
795
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
605
do{
606
ret = gnutls_handshake (session);
796
if(quit_now){
797
errno = EINTR;
798
goto mandos_end;
799
}
800
801
/* Spurious warning from -Wint-to-pointer-cast */
802
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
803
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
do {
810
ret = gnutls_handshake(session);
811
if(quit_now){
812
errno = EINTR;
813
goto mandos_end;
814
}
607
815
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
608
816
609
if (ret != GNUTLS_E_SUCCESS){
817
if(ret != GNUTLS_E_SUCCESS){
610
818
if(debug){
611
819
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
820
gnutls_perror(ret);
613
821
}
614
retval = -1;
822
errno = EPROTO;
615
823
goto mandos_end;
616
824
}
617
825
618
826
/* Read OpenPGP packet that contains the wanted password */
619
827
620
828
if(debug){
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
829
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
622
830
ip);
623
831
}
624
832
625
833
while(true){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
834
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
buffer_capacity = incbuffer(&buffer, buffer_length,
627
841
buffer_capacity);
628
if (buffer_capacity == 0){
629
perror("adjustbuffer");
630
retval = -1;
631
goto mandos_end;
632
}
633
634
ret = gnutls_record_recv(session, buffer+buffer_length,
635
BUFFER_SIZE);
636
if (ret == 0){
842
if(buffer_capacity == 0){
843
int e = errno;
844
perror_plus("incbuffer");
845
errno = e;
846
goto mandos_end;
847
}
848
849
if(quit_now){
850
errno = EINTR;
851
goto mandos_end;
852
}
853
854
sret = gnutls_record_recv(session, buffer+buffer_length,
855
BUFFER_SIZE);
856
if(sret == 0){
637
857
break;
638
858
}
639
if (ret < 0){
640
switch(ret){
859
if(sret < 0){
860
switch(sret){
641
861
case GNUTLS_E_INTERRUPTED:
642
862
case GNUTLS_E_AGAIN:
643
863
break;
644
864
case GNUTLS_E_REHANDSHAKE:
645
do{
646
ret = gnutls_handshake (session);
865
do {
866
ret = gnutls_handshake(session);
867
868
if(quit_now){
869
errno = EINTR;
870
goto mandos_end;
871
}
647
872
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
648
if (ret < 0){
873
if(ret < 0){
649
874
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
875
gnutls_perror(ret);
876
errno = EPROTO;
652
877
goto mandos_end;
653
878
}
654
879
break;
655
880
default:
656
881
fprintf(stderr, "Unknown error while reading data from"
657
882
" encrypted session with Mandos server\n");
658
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
883
gnutls_bye(session, GNUTLS_SHUT_RDWR);
884
errno = EIO;
660
885
goto mandos_end;
661
886
}
662
887
} else {
663
buffer_length += (size_t) ret;
888
buffer_length += (size_t) sret;
664
889
}
665
890
}
666
891
668
893
fprintf(stderr, "Closing TLS session\n");
669
894
}
670
895
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
896
if(quit_now){
897
errno = EINTR;
898
goto mandos_end;
899
}
900
901
do {
902
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
908
909
if(buffer_length > 0){
910
ssize_t decrypted_buffer_size;
911
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
912
buffer_length,
676
913
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
914
if(decrypted_buffer_size >= 0){
915
678
916
written = 0;
679
917
while(written < (size_t) decrypted_buffer_size){
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
918
if(quit_now){
919
errno = EINTR;
920
goto mandos_end;
921
}
922
923
ret = (int)fwrite(decrypted_buffer + written, 1,
924
(size_t)decrypted_buffer_size - written,
925
stdout);
683
926
if(ret == 0 and ferror(stdout)){
927
int e = errno;
684
928
if(debug){
685
929
fprintf(stderr, "Error writing encrypted data: %s\n",
686
930
strerror(errno));
687
931
}
688
retval = -1;
689
break;
932
errno = e;
933
goto mandos_end;
690
934
}
691
935
written += (size_t)ret;
692
936
}
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
937
retval = 0;
696
938
}
697
} else {
698
retval = -1;
699
939
}
700
940
701
941
/* Shutdown procedure */
702
942
703
943
mandos_end:
704
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
944
{
945
int e = errno;
946
free(decrypted_buffer);
947
free(buffer);
948
if(tcp_sd >= 0){
949
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
950
}
951
if(ret == -1){
952
if(e == 0){
953
e = errno;
954
}
955
perror_plus("close");
956
}
957
gnutls_deinit(session);
958
errno = e;
959
if(quit_now){
960
errno = EINTR;
961
retval = -1;
962
}
708
963
}
709
gnutls_deinit (session);
710
964
return retval;
711
965
}
712
966
713
967
static void resolve_callback(AvahiSServiceResolver *r,
714
968
AvahiIfIndex interface,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
969
AvahiProtocol proto,
716
970
AvahiResolverEvent event,
717
971
const char *name,
718
972
const char *type,
723
977
AVAHI_GCC_UNUSED AvahiStringList *txt,
724
978
AVAHI_GCC_UNUSED AvahiLookupResultFlags
725
979
flags,
726
void* userdata) {
727
mandos_context *mc = userdata;
980
AVAHI_GCC_UNUSED void* userdata){
728
981
assert(r);
729
982
730
983
/* Called whenever a service has been resolved successfully or
731
984
timed out */
732
985
733
switch (event) {
986
if(quit_now){
987
return;
988
}
989
990
switch(event){
734
991
default:
735
992
case AVAHI_RESOLVER_FAILURE:
736
993
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
994
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
995
avahi_strerror(avahi_server_errno(mc.server)));
739
996
break;
740
997
741
998
case AVAHI_RESOLVER_FOUND:
744
1001
avahi_address_snprint(ip, sizeof(ip), address);
745
1002
if(debug){
746
1003
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
1004
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1005
ip, (intmax_t)interface, port);
749
1006
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
1007
int ret = start_mandos_communication(ip, port, interface,
1008
avahi_proto_to_af(proto));
1009
if(ret == 0){
1010
avahi_simple_poll_quit(mc.simple_poll);
1011
} else {
1012
ret = add_server(ip, port, interface,
1013
avahi_proto_to_af(proto));
753
1014
}
754
1015
}
755
1016
}
756
1017
avahi_s_service_resolver_free(r);
757
1018
}
758
1019
759
static void browse_callback( AvahiSServiceBrowser *b,
760
AvahiIfIndex interface,
761
AvahiProtocol protocol,
762
AvahiBrowserEvent event,
763
const char *name,
764
const char *type,
765
const char *domain,
766
AVAHI_GCC_UNUSED AvahiLookupResultFlags
767
flags,
768
void* userdata) {
769
mandos_context *mc = userdata;
1020
static void browse_callback(AvahiSServiceBrowser *b,
1021
AvahiIfIndex interface,
1022
AvahiProtocol protocol,
1023
AvahiBrowserEvent event,
1024
const char *name,
1025
const char *type,
1026
const char *domain,
1027
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1028
flags,
1029
AVAHI_GCC_UNUSED void* userdata){
770
1030
assert(b);
771
1031
772
1032
/* Called whenever a new services becomes available on the LAN or
773
1033
is removed from the LAN */
774
1034
775
switch (event) {
1035
if(quit_now){
1036
return;
1037
}
1038
1039
switch(event){
776
1040
default:
777
1041
case AVAHI_BROWSER_FAILURE:
778
1042
779
1043
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
1044
avahi_strerror(avahi_server_errno(mc.server)));
1045
avahi_simple_poll_quit(mc.simple_poll);
782
1046
return;
783
1047
784
1048
case AVAHI_BROWSER_NEW:
787
1051
the callback function is called the Avahi server will free the
788
1052
resolver for us. */
789
1053
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
1054
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1055
name, type, domain, protocol, 0,
1056
resolve_callback, NULL) == NULL)
794
1057
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
1058
name, avahi_strerror(avahi_server_errno(mc.server)));
796
1059
break;
797
1060
798
1061
case AVAHI_BROWSER_REMOVE:
807
1070
}
808
1071
}
809
1072
1073
/* Signal handler that stops main loop after SIGTERM */
1074
static void handle_sigterm(int sig){
1075
if(quit_now){
1076
return;
1077
}
1078
quit_now = 1;
1079
signal_received = sig;
1080
int old_errno = errno;
1081
/* set main loop to exit */
1082
if(mc.simple_poll != NULL){
1083
avahi_simple_poll_quit(mc.simple_poll);
1084
}
1085
errno = old_errno;
1086
}
1087
1088
/*
1089
* This function determines if a directory entry in /sys/class/net
1090
* corresponds to an acceptable network device.
1091
* (This function is passed to scandir(3) as a filter function.)
1092
*/
1093
int good_interface(const struct dirent *if_entry){
1094
ssize_t ssret;
1095
char *flagname = NULL;
1096
if(if_entry->d_name[0] == '.'){
1097
return 0;
1098
}
1099
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1100
if_entry->d_name);
1101
if(ret < 0){
1102
perror_plus("asprintf");
1103
return 0;
1104
}
1105
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
if(flags_fd == -1){
1107
perror_plus("open");
1108
free(flagname);
1109
return 0;
1110
}
1111
free(flagname);
1112
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1113
/* read line from flags_fd */
1114
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1115
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1116
flagstring[(size_t)to_read] = '\0';
1117
if(flagstring == NULL){
1118
perror_plus("malloc");
1119
close(flags_fd);
1120
return 0;
1121
}
1122
while(to_read > 0){
1123
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1124
(size_t)to_read));
1125
if(ssret == -1){
1126
perror_plus("read");
1127
free(flagstring);
1128
close(flags_fd);
1129
return 0;
1130
}
1131
to_read -= ssret;
1132
if(ssret == 0){
1133
break;
1134
}
1135
}
1136
close(flags_fd);
1137
intmax_t tmpmax;
1138
char *tmp;
1139
errno = 0;
1140
tmpmax = strtoimax(flagstring, &tmp, 0);
1141
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1142
and not (isspace(*tmp)))
1143
or tmpmax != (ifreq_flags)tmpmax){
1144
if(debug){
1145
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1146
flagstring, if_entry->d_name);
1147
}
1148
free(flagstring);
1149
return 0;
1150
}
1151
free(flagstring);
1152
ifreq_flags flags = (ifreq_flags)tmpmax;
1153
/* Reject the loopback device */
1154
if(flags & IFF_LOOPBACK){
1155
if(debug){
1156
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1157
if_entry->d_name);
1158
}
1159
return 0;
1160
}
1161
/* Accept point-to-point devices only if connect_to is specified */
1162
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
if(debug){
1164
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 1;
1168
}
1169
/* Otherwise, reject non-broadcast-capable devices */
1170
if(not (flags & IFF_BROADCAST)){
1171
if(debug){
1172
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1173
if_entry->d_name);
1174
}
1175
return 0;
1176
}
1177
/* Reject non-ARP interfaces (including dummy interfaces) */
1178
if(flags & IFF_NOARP){
1179
if(debug){
1180
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1181
if_entry->d_name);
1182
}
1183
return 0;
1184
}
1185
/* Accept this device */
1186
if(debug){
1187
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1188
if_entry->d_name);
1189
}
1190
return 1;
1191
}
1192
1193
int notdotentries(const struct dirent *direntry){
1194
/* Skip "." and ".." */
1195
if(direntry->d_name[0] == '.'
1196
and (direntry->d_name[1] == '\0'
1197
or (direntry->d_name[1] == '.'
1198
and direntry->d_name[2] == '\0'))){
1199
return 0;
1200
}
1201
return 1;
1202
}
1203
1204
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1205
int ret;
1206
struct timespec now;
1207
struct timespec waited_time;
1208
intmax_t block_time;
1209
1210
while(true){
1211
if(mc.current_server == NULL){
1212
if (debug){
1213
fprintf(stderr,
1214
"Wait until first server is found. No timeout!\n");
1215
}
1216
ret = avahi_simple_poll_iterate(s, -1);
1217
} else {
1218
if (debug){
1219
fprintf(stderr, "Check current_server if we should run it,"
1220
" or wait\n");
1221
}
1222
/* the current time */
1223
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1224
if(ret == -1){
1225
perror_plus("clock_gettime");
1226
return -1;
1227
}
1228
/* Calculating in ms how long time between now and server
1229
who we visted longest time ago. Now - last seen. */
1230
waited_time.tv_sec = (now.tv_sec
1231
- mc.current_server->last_seen.tv_sec);
1232
waited_time.tv_nsec = (now.tv_nsec
1233
- mc.current_server->last_seen.tv_nsec);
1234
/* total time is 10s/10,000ms.
1235
Converting to s from ms by dividing by 1,000,
1236
and ns to ms by dividing by 1,000,000. */
1237
block_time = ((retry_interval
1238
- ((intmax_t)waited_time.tv_sec * 1000))
1239
- ((intmax_t)waited_time.tv_nsec / 1000000));
1240
1241
if (debug){
1242
fprintf(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1243
}
1244
1245
if(block_time <= 0){
1246
ret = start_mandos_communication(mc.current_server->ip,
1247
mc.current_server->port,
1248
mc.current_server->if_index,
1249
mc.current_server->af);
1250
if(ret == 0){
1251
avahi_simple_poll_quit(mc.simple_poll);
1252
return 0;
1253
}
1254
ret = clock_gettime(CLOCK_MONOTONIC,
1255
&mc.current_server->last_seen);
1256
if(ret == -1){
1257
perror_plus("clock_gettime");
1258
return -1;
1259
}
1260
mc.current_server = mc.current_server->next;
1261
block_time = 0; /* Call avahi to find new Mandos
1262
servers, but don't block */
1263
}
1264
1265
ret = avahi_simple_poll_iterate(s, (int)block_time);
1266
}
1267
if(ret != 0){
1268
if (ret > 0 or errno != EINTR) {
1269
return (ret != 1) ? ret : 0;
1270
}
1271
}
1272
}
1273
}
1274
810
1275
int main(int argc, char *argv[]){
811
AvahiSServiceBrowser *sb = NULL;
812
int error;
813
int ret;
814
int exitcode = EXIT_SUCCESS;
815
const char *interface = "eth0";
816
struct ifreq network;
817
int sd;
818
uid_t uid;
819
gid_t gid;
820
char *connect_to = NULL;
821
char tempdir[] = "/tmp/mandosXXXXXX";
822
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
823
const char *seckey = PATHDIR "/" SECKEY;
824
const char *pubkey = PATHDIR "/" PUBKEY;
825
826
mandos_context mc = { .simple_poll = NULL, .server = NULL,
827
.dh_bits = 1024, .priority = "SECURE256"
828
":!CTYPE-X.509:+CTYPE-OPENPGP" };
829
bool gnutls_initalized = false;
830
bool gpgme_initalized = false;
831
832
{
833
struct argp_option options[] = {
834
{ .name = "debug", .key = 128,
835
.doc = "Debug mode", .group = 3 },
836
{ .name = "connect", .key = 'c',
837
.arg = "ADDRESS:PORT",
838
.doc = "Connect directly to a specific Mandos server",
839
.group = 1 },
840
{ .name = "interface", .key = 'i',
841
.arg = "NAME",
842
.doc = "Interface that will be used to search for Mandos"
843
" servers",
844
.group = 1 },
845
{ .name = "seckey", .key = 's',
846
.arg = "FILE",
847
.doc = "OpenPGP secret key file base name",
848
.group = 1 },
849
{ .name = "pubkey", .key = 'p',
850
.arg = "FILE",
851
.doc = "OpenPGP public key file base name",
852
.group = 2 },
853
{ .name = "dh-bits", .key = 129,
854
.arg = "BITS",
855
.doc = "Bit length of the prime number used in the"
856
" Diffie-Hellman key exchange",
857
.group = 2 },
858
{ .name = "priority", .key = 130,
859
.arg = "STRING",
860
.doc = "GnuTLS priority string for the TLS handshake",
861
.group = 1 },
862
{ .name = NULL }
863
};
864
865
error_t parse_opt (int key, char *arg,
866
struct argp_state *state) {
867
/* Get the INPUT argument from `argp_parse', which we know is
868
a pointer to our plugin list pointer. */
869
switch (key) {
870
case 128: /* --debug */
871
debug = true;
872
break;
873
case 'c': /* --connect */
874
connect_to = arg;
875
break;
876
case 'i': /* --interface */
877
interface = arg;
878
break;
879
case 's': /* --seckey */
880
seckey = arg;
881
break;
882
case 'p': /* --pubkey */
883
pubkey = arg;
884
break;
885
case 129: /* --dh-bits */
886
errno = 0;
887
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
888
if (errno){
889
perror("strtol");
890
exit(EXIT_FAILURE);
891
}
892
break;
893
case 130: /* --priority */
894
mc.priority = arg;
895
break;
896
case ARGP_KEY_ARG:
897
argp_usage (state);
898
case ARGP_KEY_END:
899
break;
900
default:
901
return ARGP_ERR_UNKNOWN;
902
}
903
return 0;
904
}
905
906
struct argp argp = { .options = options, .parser = parse_opt,
907
.args_doc = "",
908
.doc = "Mandos client -- Get and decrypt"
909
" passwords from a Mandos server" };
910
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
911
if (ret == ARGP_ERR_UNKNOWN){
912
fprintf(stderr, "Unknown error while parsing arguments\n");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
918
/* If the interface is down, bring it up */
919
{
920
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
921
if(sd < 0) {
922
perror("socket");
923
exitcode = EXIT_FAILURE;
924
goto end;
925
}
926
strcpy(network.ifr_name, interface);
927
ret = ioctl(sd, SIOCGIFFLAGS, &network);
928
if(ret == -1){
929
perror("ioctl SIOCGIFFLAGS");
930
exitcode = EXIT_FAILURE;
931
goto end;
932
}
933
if((network.ifr_flags & IFF_UP) == 0){
934
network.ifr_flags |= IFF_UP;
935
ret = ioctl(sd, SIOCSIFFLAGS, &network);
936
if(ret == -1){
937
perror("ioctl SIOCSIFFLAGS");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
}
941
}
942
ret = TEMP_FAILURE_RETRY(close(sd));
943
if(ret == -1){
944
perror("close");
945
}
946
}
947
948
uid = getuid();
949
gid = getgid();
950
951
ret = setuid(uid);
952
if (ret == -1){
953
perror("setuid");
954
}
955
956
setgid(gid);
957
if (ret == -1){
958
perror("setgid");
959
}
960
961
ret = init_gnutls_global(&mc, pubkey, seckey);
962
if (ret == -1){
963
fprintf(stderr, "init_gnutls_global failed\n");
964
exitcode = EXIT_FAILURE;
965
goto end;
966
} else {
967
gnutls_initalized = true;
968
}
969
970
if(mkdtemp(tempdir) == NULL){
971
perror("mkdtemp");
972
tempdir[0] = '\0';
973
goto end;
974
}
975
976
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
977
fprintf(stderr, "gpgme_initalized failed\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
} else {
981
gpgme_initalized = true;
982
}
983
1276
AvahiSServiceBrowser *sb = NULL;
1277
int error;
1278
int ret;
1279
intmax_t tmpmax;
1280
char *tmp;
1281
int exitcode = EXIT_SUCCESS;
1282
const char *interface = "";
1283
struct ifreq network;
1284
int sd = -1;
1285
bool take_down_interface = false;
1286
uid_t uid;
1287
gid_t gid;
1288
char tempdir[] = "/tmp/mandosXXXXXX";
1289
bool tempdir_created = false;
1290
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1291
const char *seckey = PATHDIR "/" SECKEY;
1292
const char *pubkey = PATHDIR "/" PUBKEY;
1293
1294
bool gnutls_initialized = false;
1295
bool gpgme_initialized = false;
1296
float delay = 2.5f;
1297
double retry_interval = 10; /* 10s between trying a server and
1298
retrying the same server again */
1299
1300
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1301
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1302
1303
uid = getuid();
1304
gid = getgid();
1305
1306
/* Lower any group privileges we might have, just to be safe */
1307
errno = 0;
1308
ret = setgid(gid);
1309
if(ret == -1){
1310
perror_plus("setgid");
1311
}
1312
1313
/* Lower user privileges (temporarily) */
1314
errno = 0;
1315
ret = seteuid(uid);
1316
if(ret == -1){
1317
perror_plus("seteuid");
1318
}
1319
1320
if(quit_now){
1321
goto end;
1322
}
1323
1324
{
1325
struct argp_option options[] = {
1326
{ .name = "debug", .key = 128,
1327
.doc = "Debug mode", .group = 3 },
1328
{ .name = "connect", .key = 'c',
1329
.arg = "ADDRESS:PORT",
1330
.doc = "Connect directly to a specific Mandos server",
1331
.group = 1 },
1332
{ .name = "interface", .key = 'i',
1333
.arg = "NAME",
1334
.doc = "Network interface that will be used to search for"
1335
" Mandos servers",
1336
.group = 1 },
1337
{ .name = "seckey", .key = 's',
1338
.arg = "FILE",
1339
.doc = "OpenPGP secret key file base name",
1340
.group = 1 },
1341
{ .name = "pubkey", .key = 'p',
1342
.arg = "FILE",
1343
.doc = "OpenPGP public key file base name",
1344
.group = 2 },
1345
{ .name = "dh-bits", .key = 129,
1346
.arg = "BITS",
1347
.doc = "Bit length of the prime number used in the"
1348
" Diffie-Hellman key exchange",
1349
.group = 2 },
1350
{ .name = "priority", .key = 130,
1351
.arg = "STRING",
1352
.doc = "GnuTLS priority string for the TLS handshake",
1353
.group = 1 },
1354
{ .name = "delay", .key = 131,
1355
.arg = "SECONDS",
1356
.doc = "Maximum delay to wait for interface startup",
1357
.group = 2 },
1358
{ .name = "retry", .key = 132,
1359
.arg = "SECONDS",
1360
.doc = "Retry interval used when denied by the mandos server",
1361
.group = 2 },
1362
/*
1363
* These reproduce what we would get without ARGP_NO_HELP
1364
*/
1365
{ .name = "help", .key = '?',
1366
.doc = "Give this help list", .group = -1 },
1367
{ .name = "usage", .key = -3,
1368
.doc = "Give a short usage message", .group = -1 },
1369
{ .name = "version", .key = 'V',
1370
.doc = "Print program version", .group = -1 },
1371
{ .name = NULL }
1372
};
1373
1374
error_t parse_opt(int key, char *arg,
1375
struct argp_state *state){
1376
errno = 0;
1377
switch(key){
1378
case 128: /* --debug */
1379
debug = true;
1380
break;
1381
case 'c': /* --connect */
1382
connect_to = arg;
1383
break;
1384
case 'i': /* --interface */
1385
interface = arg;
1386
break;
1387
case 's': /* --seckey */
1388
seckey = arg;
1389
break;
1390
case 'p': /* --pubkey */
1391
pubkey = arg;
1392
break;
1393
case 129: /* --dh-bits */
1394
errno = 0;
1395
tmpmax = strtoimax(arg, &tmp, 10);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'
1397
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1398
argp_error(state, "Bad number of DH bits");
1399
}
1400
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1401
break;
1402
case 130: /* --priority */
1403
mc.priority = arg;
1404
break;
1405
case 131: /* --delay */
1406
errno = 0;
1407
delay = strtof(arg, &tmp);
1408
if(errno != 0 or tmp == arg or *tmp != '\0'){
1409
argp_error(state, "Bad delay");
1410
}
1411
case 132: /* --retry */
1412
errno = 0;
1413
retry_interval = strtod(arg, &tmp);
1414
if(errno != 0 or tmp == arg or *tmp != '\0'
1415
or (retry_interval * 1000) > INT_MAX
1416
or retry_interval < 0){
1417
argp_error(state, "Bad retry interval");
1418
}
1419
break;
1420
/*
1421
* These reproduce what we would get without ARGP_NO_HELP
1422
*/
1423
case '?': /* --help */
1424
argp_state_help(state, state->out_stream,
1425
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1426
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1427
case -3: /* --usage */
1428
argp_state_help(state, state->out_stream,
1429
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1430
case 'V': /* --version */
1431
fprintf(state->out_stream, "%s\n", argp_program_version);
1432
exit(argp_err_exit_status);
1433
break;
1434
default:
1435
return ARGP_ERR_UNKNOWN;
1436
}
1437
return errno;
1438
}
1439
1440
struct argp argp = { .options = options, .parser = parse_opt,
1441
.args_doc = "",
1442
.doc = "Mandos client -- Get and decrypt"
1443
" passwords from a Mandos server" };
1444
ret = argp_parse(&argp, argc, argv,
1445
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1446
switch(ret){
1447
case 0:
1448
break;
1449
case ENOMEM:
1450
default:
1451
errno = ret;
1452
perror_plus("argp_parse");
1453
exitcode = EX_OSERR;
1454
goto end;
1455
case EINVAL:
1456
exitcode = EX_USAGE;
1457
goto end;
1458
}
1459
}
1460
1461
{
1462
/* Work around Debian bug #633582:
1463
<http://bugs.debian.org/633582> */
1464
struct stat st;
1465
1466
/* Re-raise priviliges */
1467
errno = 0;
1468
ret = seteuid(0);
1469
if(ret == -1){
1470
perror_plus("seteuid");
1471
}
1472
1473
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1474
int seckey_fd = open(seckey, O_RDONLY);
1475
if(seckey_fd == -1){
1476
perror_plus("open");
1477
} else {
1478
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1479
if(ret == -1){
1480
perror_plus("fstat");
1481
} else {
1482
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1483
ret = fchown(seckey_fd, uid, gid);
1484
if(ret == -1){
1485
perror_plus("fchown");
1486
}
1487
}
1488
}
1489
TEMP_FAILURE_RETRY(close(seckey_fd));
1490
}
1491
}
1492
1493
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1494
int pubkey_fd = open(pubkey, O_RDONLY);
1495
if(pubkey_fd == -1){
1496
perror_plus("open");
1497
} else {
1498
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1499
if(ret == -1){
1500
perror_plus("fstat");
1501
} else {
1502
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1503
ret = fchown(pubkey_fd, uid, gid);
1504
if(ret == -1){
1505
perror_plus("fchown");
1506
}
1507
}
1508
}
1509
TEMP_FAILURE_RETRY(close(pubkey_fd));
1510
}
1511
}
1512
1513
/* Lower privileges */
1514
errno = 0;
1515
ret = seteuid(uid);
1516
if(ret == -1){
1517
perror_plus("seteuid");
1518
}
1519
}
1520
1521
if(not debug){
1522
avahi_set_log_function(empty_log);
1523
}
1524
1525
if(interface[0] == '\0'){
1526
struct dirent **direntries;
1527
ret = scandir(sys_class_net, &direntries, good_interface,
1528
alphasort);
1529
if(ret >= 1){
1530
/* Pick the first good interface */
1531
interface = strdup(direntries[0]->d_name);
1532
if(debug){
1533
fprintf(stderr, "Using interface \"%s\"\n", interface);
1534
}
1535
if(interface == NULL){
1536
perror_plus("malloc");
1537
free(direntries);
1538
exitcode = EXIT_FAILURE;
1539
goto end;
1540
}
1541
free(direntries);
1542
} else {
1543
free(direntries);
1544
fprintf(stderr, "Could not find a network interface\n");
1545
exitcode = EXIT_FAILURE;
1546
goto end;
1547
}
1548
}
1549
1550
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1551
from the signal handler */
1552
/* Initialize the pseudo-RNG for Avahi */
1553
srand((unsigned int) time(NULL));
1554
mc.simple_poll = avahi_simple_poll_new();
1555
if(mc.simple_poll == NULL){
1556
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1557
exitcode = EX_UNAVAILABLE;
1558
goto end;
1559
}
1560
1561
sigemptyset(&sigterm_action.sa_mask);
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1563
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1566
goto end;
1567
}
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1569
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1572
goto end;
1573
}
1574
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1575
if(ret == -1){
1576
perror_plus("sigaddset");
1577
exitcode = EX_OSERR;
1578
goto end;
1579
}
1580
/* Need to check if the handler is SIG_IGN before handling:
1581
| [[info:libc:Initial Signal Actions]] |
1582
| [[info:libc:Basic Signal Handling]] |
1583
*/
1584
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1585
if(ret == -1){
1586
perror_plus("sigaction");
1587
return EX_OSERR;
1588
}
1589
if(old_sigterm_action.sa_handler != SIG_IGN){
1590
ret = sigaction(SIGINT, &sigterm_action, NULL);
1591
if(ret == -1){
1592
perror_plus("sigaction");
1593
exitcode = EX_OSERR;
1594
goto end;
1595
}
1596
}
1597
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1598
if(ret == -1){
1599
perror_plus("sigaction");
1600
return EX_OSERR;
1601
}
1602
if(old_sigterm_action.sa_handler != SIG_IGN){
1603
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1604
if(ret == -1){
1605
perror_plus("sigaction");
1606
exitcode = EX_OSERR;
1607
goto end;
1608
}
1609
}
1610
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1611
if(ret == -1){
1612
perror_plus("sigaction");
1613
return EX_OSERR;
1614
}
1615
if(old_sigterm_action.sa_handler != SIG_IGN){
1616
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1617
if(ret == -1){
1618
perror_plus("sigaction");
1619
exitcode = EX_OSERR;
1620
goto end;
1621
}
1622
}
1623
1624
/* If the interface is down, bring it up */
1625
if(strcmp(interface, "none") != 0){
984
1626
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
1627
if(if_index == 0){
986
1628
fprintf(stderr, "No such interface: \"%s\"\n", interface);
987
exit(EXIT_FAILURE);
988
}
989
990
if(connect_to != NULL){
991
/* Connect directly, do not use Zeroconf */
992
/* (Mainly meant for debugging) */
993
char *address = strrchr(connect_to, ':');
994
if(address == NULL){
995
fprintf(stderr, "No colon in address\n");
996
exitcode = EXIT_FAILURE;
997
goto end;
998
}
999
errno = 0;
1000
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1001
if(errno){
1002
perror("Bad port number");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
*address = '\0';
1007
address = connect_to;
1008
ret = start_mandos_communication(address, port, if_index, &mc);
1009
if(ret < 0){
1010
exitcode = EXIT_FAILURE;
1011
} else {
1012
exitcode = EXIT_SUCCESS;
1013
}
1014
goto end;
1015
}
1016
1017
if (not debug){
1018
avahi_set_log_function(empty_log);
1019
}
1020
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
1024
/* Allocate main Avahi loop object */
1025
mc.simple_poll = avahi_simple_poll_new();
1026
if (mc.simple_poll == NULL) {
1027
fprintf(stderr, "Avahi: Failed to create simple poll"
1028
" object.\n");
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
{
1034
AvahiServerConfig config;
1035
/* Do not publish any local Zeroconf records */
1036
avahi_server_config_init(&config);
1037
config.publish_hinfo = 0;
1038
config.publish_addresses = 0;
1039
config.publish_workstation = 0;
1040
config.publish_domain = 0;
1041
1042
/* Allocate a new server */
1043
mc.server = avahi_server_new(avahi_simple_poll_get
1044
(mc.simple_poll), &config, NULL,
1045
NULL, &error);
1046
1047
/* Free the Avahi configuration data */
1048
avahi_server_config_free(&config);
1049
}
1050
1051
/* Check if creating the Avahi server object succeeded */
1052
if (mc.server == NULL) {
1053
fprintf(stderr, "Failed to create Avahi server: %s\n",
1054
avahi_strerror(error));
1055
exitcode = EXIT_FAILURE;
1056
goto end;
1057
}
1058
1059
/* Create the Avahi service browser */
1060
sb = avahi_s_service_browser_new(mc.server, if_index,
1061
AVAHI_PROTO_INET6,
1062
"_mandos._tcp", NULL, 0,
1063
browse_callback, &mc);
1064
if (sb == NULL) {
1065
fprintf(stderr, "Failed to create service browser: %s\n",
1066
avahi_strerror(avahi_server_errno(mc.server)));
1067
exitcode = EXIT_FAILURE;
1068
goto end;
1069
}
1070
1071
/* Run the main loop */
1072
1073
if (debug){
1074
fprintf(stderr, "Starting Avahi loop search\n");
1075
}
1076
1077
avahi_simple_poll_loop(mc.simple_poll);
1078
1629
exitcode = EX_UNAVAILABLE;
1630
goto end;
1631
}
1632
1633
if(quit_now){
1634
goto end;
1635
}
1636
1637
/* Re-raise priviliges */
1638
errno = 0;
1639
ret = seteuid(0);
1640
if(ret == -1){
1641
perror_plus("seteuid");
1642
}
1643
1644
#ifdef __linux__
1645
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1646
messages about the network interface to mess up the prompt */
1647
ret = klogctl(8, NULL, 5);
1648
bool restore_loglevel = true;
1649
if(ret == -1){
1650
restore_loglevel = false;
1651
perror_plus("klogctl");
1652
}
1653
#endif /* __linux__ */
1654
1655
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1656
if(sd < 0){
1657
perror_plus("socket");
1658
exitcode = EX_OSERR;
1659
#ifdef __linux__
1660
if(restore_loglevel){
1661
ret = klogctl(7, NULL, 0);
1662
if(ret == -1){
1663
perror_plus("klogctl");
1664
}
1665
}
1666
#endif /* __linux__ */
1667
/* Lower privileges */
1668
errno = 0;
1669
ret = seteuid(uid);
1670
if(ret == -1){
1671
perror_plus("seteuid");
1672
}
1673
goto end;
1674
}
1675
strcpy(network.ifr_name, interface);
1676
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1677
if(ret == -1){
1678
perror_plus("ioctl SIOCGIFFLAGS");
1679
#ifdef __linux__
1680
if(restore_loglevel){
1681
ret = klogctl(7, NULL, 0);
1682
if(ret == -1){
1683
perror_plus("klogctl");
1684
}
1685
}
1686
#endif /* __linux__ */
1687
exitcode = EX_OSERR;
1688
/* Lower privileges */
1689
errno = 0;
1690
ret = seteuid(uid);
1691
if(ret == -1){
1692
perror_plus("seteuid");
1693
}
1694
goto end;
1695
}
1696
if((network.ifr_flags & IFF_UP) == 0){
1697
network.ifr_flags |= IFF_UP;
1698
take_down_interface = true;
1699
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1700
if(ret == -1){
1701
take_down_interface = false;
1702
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1703
exitcode = EX_OSERR;
1704
#ifdef __linux__
1705
if(restore_loglevel){
1706
ret = klogctl(7, NULL, 0);
1707
if(ret == -1){
1708
perror_plus("klogctl");
1709
}
1710
}
1711
#endif /* __linux__ */
1712
/* Lower privileges */
1713
errno = 0;
1714
ret = seteuid(uid);
1715
if(ret == -1){
1716
perror_plus("seteuid");
1717
}
1718
goto end;
1719
}
1720
}
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1725
if(ret == -1){
1726
perror_plus("ioctl SIOCGIFFLAGS");
1727
} else if(network.ifr_flags & IFF_RUNNING){
1728
break;
1729
}
1730
struct timespec sleeptime = { .tv_nsec = 250000000 };
1731
ret = nanosleep(&sleeptime, NULL);
1732
if(ret == -1 and errno != EINTR){
1733
perror_plus("nanosleep");
1734
}
1735
}
1736
if(not take_down_interface){
1737
/* We won't need the socket anymore */
1738
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1739
if(ret == -1){
1740
perror_plus("close");
1741
}
1742
}
1743
#ifdef __linux__
1744
if(restore_loglevel){
1745
/* Restores kernel loglevel to default */
1746
ret = klogctl(7, NULL, 0);
1747
if(ret == -1){
1748
perror_plus("klogctl");
1749
}
1750
}
1751
#endif /* __linux__ */
1752
/* Lower privileges */
1753
errno = 0;
1754
if(take_down_interface){
1755
/* Lower privileges */
1756
ret = seteuid(uid);
1757
if(ret == -1){
1758
perror_plus("seteuid");
1759
}
1760
} else {
1761
/* Lower privileges permanently */
1762
ret = setuid(uid);
1763
if(ret == -1){
1764
perror_plus("setuid");
1765
}
1766
}
1767
}
1768
1769
if(quit_now){
1770
goto end;
1771
}
1772
1773
ret = init_gnutls_global(pubkey, seckey);
1774
if(ret == -1){
1775
fprintf(stderr, "init_gnutls_global failed\n");
1776
exitcode = EX_UNAVAILABLE;
1777
goto end;
1778
} else {
1779
gnutls_initialized = true;
1780
}
1781
1782
if(quit_now){
1783
goto end;
1784
}
1785
1786
if(mkdtemp(tempdir) == NULL){
1787
perror_plus("mkdtemp");
1788
goto end;
1789
}
1790
tempdir_created = true;
1791
1792
if(quit_now){
1793
goto end;
1794
}
1795
1796
if(not init_gpgme(pubkey, seckey, tempdir)){
1797
fprintf(stderr, "init_gpgme failed\n");
1798
exitcode = EX_UNAVAILABLE;
1799
goto end;
1800
} else {
1801
gpgme_initialized = true;
1802
}
1803
1804
if(quit_now){
1805
goto end;
1806
}
1807
1808
if(connect_to != NULL){
1809
/* Connect directly, do not use Zeroconf */
1810
/* (Mainly meant for debugging) */
1811
char *address = strrchr(connect_to, ':');
1812
if(address == NULL){
1813
fprintf(stderr, "No colon in address\n");
1814
exitcode = EX_USAGE;
1815
goto end;
1816
}
1817
1818
if(quit_now){
1819
goto end;
1820
}
1821
1822
uint16_t port;
1823
errno = 0;
1824
tmpmax = strtoimax(address+1, &tmp, 10);
1825
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1826
or tmpmax != (uint16_t)tmpmax){
1827
fprintf(stderr, "Bad port number\n");
1828
exitcode = EX_USAGE;
1829
goto end;
1830
}
1831
1832
if(quit_now){
1833
goto end;
1834
}
1835
1836
port = (uint16_t)tmpmax;
1837
*address = '\0';
1838
/* Colon in address indicates IPv6 */
1839
int af;
1840
if(strchr(connect_to, ':') != NULL){
1841
af = AF_INET6;
1842
/* Accept [] around IPv6 address - see RFC 5952 */
1843
if(connect_to[0] == '[' and address[-1] == ']')
1844
{
1845
connect_to++;
1846
address[-1] = '\0';
1847
}
1848
} else {
1849
af = AF_INET;
1850
}
1851
address = connect_to;
1852
1853
if(quit_now){
1854
goto end;
1855
}
1856
1857
while(not quit_now){
1858
ret = start_mandos_communication(address, port, if_index, af);
1859
if(quit_now or ret == 0){
1860
break;
1861
}
1862
if(debug){
1863
fprintf(stderr, "Retrying in %d seconds\n",
1864
(int)retry_interval);
1865
}
1866
sleep((int)retry_interval);
1867
}
1868
1869
if (not quit_now){
1870
exitcode = EXIT_SUCCESS;
1871
}
1872
1873
goto end;
1874
}
1875
1876
if(quit_now){
1877
goto end;
1878
}
1879
1880
{
1881
AvahiServerConfig config;
1882
/* Do not publish any local Zeroconf records */
1883
avahi_server_config_init(&config);
1884
config.publish_hinfo = 0;
1885
config.publish_addresses = 0;
1886
config.publish_workstation = 0;
1887
config.publish_domain = 0;
1888
1889
/* Allocate a new server */
1890
mc.server = avahi_server_new(avahi_simple_poll_get
1891
(mc.simple_poll), &config, NULL,
1892
NULL, &error);
1893
1894
/* Free the Avahi configuration data */
1895
avahi_server_config_free(&config);
1896
}
1897
1898
/* Check if creating the Avahi server object succeeded */
1899
if(mc.server == NULL){
1900
fprintf(stderr, "Failed to create Avahi server: %s\n",
1901
avahi_strerror(error));
1902
exitcode = EX_UNAVAILABLE;
1903
goto end;
1904
}
1905
1906
if(quit_now){
1907
goto end;
1908
}
1909
1910
/* Create the Avahi service browser */
1911
sb = avahi_s_service_browser_new(mc.server, if_index,
1912
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1913
NULL, 0, browse_callback, NULL);
1914
if(sb == NULL){
1915
fprintf(stderr, "Failed to create service browser: %s\n",
1916
avahi_strerror(avahi_server_errno(mc.server)));
1917
exitcode = EX_UNAVAILABLE;
1918
goto end;
1919
}
1920
1921
if(quit_now){
1922
goto end;
1923
}
1924
1925
/* Run the main loop */
1926
1927
if(debug){
1928
fprintf(stderr, "Starting Avahi loop search\n");
1929
}
1930
1931
ret = avahi_loop_with_timeout(mc.simple_poll,
1932
(int)(retry_interval * 1000));
1933
if(debug){
1934
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1935
(ret == 0) ? "successfully" : "with error");
1936
}
1937
1079
1938
end:
1080
1081
if (debug){
1082
fprintf(stderr, "%s exiting\n", argv[0]);
1083
}
1084
1085
/* Cleanup things */
1086
if (sb != NULL)
1087
avahi_s_service_browser_free(sb);
1088
1089
if (mc.server != NULL)
1090
avahi_server_free(mc.server);
1091
1092
if (mc.simple_poll != NULL)
1093
avahi_simple_poll_free(mc.simple_poll);
1094
1095
if (gnutls_initalized){
1096
gnutls_certificate_free_credentials(mc.cred);
1097
gnutls_global_deinit ();
1098
gnutls_dh_params_deinit(mc.dh_params);
1099
}
1100
1101
if(gpgme_initalized){
1102
gpgme_release(mc.ctx);
1103
}
1104
1105
/* Removes the temp directory used by GPGME */
1106
if(tempdir[0] != '\0'){
1107
DIR *d;
1108
struct dirent *direntry;
1109
d = opendir(tempdir);
1110
if(d == NULL){
1111
perror("opendir");
1112
} else {
1113
while(true){
1114
direntry = readdir(d);
1115
if(direntry == NULL){
1116
break;
1117
}
1118
if (direntry->d_type == DT_REG){
1119
char *fullname = NULL;
1120
ret = asprintf(&fullname, "%s/%s", tempdir,
1121
direntry->d_name);
1122
if(ret < 0){
1123
perror("asprintf");
1124
continue;
1125
}
1126
ret = unlink(fullname);
1127
if(ret == -1){
1128
fprintf(stderr, "unlink(\"%s\"): %s",
1129
fullname, strerror(errno));
1130
}
1131
free(fullname);
1132
}
1133
}
1134
closedir(d);
1135
}
1136
ret = rmdir(tempdir);
1137
if(ret == -1){
1138
perror("rmdir");
1139
}
1140
}
1141
1142
return exitcode;
1939
1940
if(debug){
1941
fprintf(stderr, "%s exiting\n", argv[0]);
1942
}
1943
1944
/* Cleanup things */
1945
if(sb != NULL)
1946
avahi_s_service_browser_free(sb);
1947
1948
if(mc.server != NULL)
1949
avahi_server_free(mc.server);
1950
1951
if(mc.simple_poll != NULL)
1952
avahi_simple_poll_free(mc.simple_poll);
1953
1954
if(gnutls_initialized){
1955
gnutls_certificate_free_credentials(mc.cred);
1956
gnutls_global_deinit();
1957
gnutls_dh_params_deinit(mc.dh_params);
1958
}
1959
1960
if(gpgme_initialized){
1961
gpgme_release(mc.ctx);
1962
}
1963
1964
/* Cleans up the circular linked list of Mandos servers the client
1965
has seen */
1966
if(mc.current_server != NULL){
1967
mc.current_server->prev->next = NULL;
1968
while(mc.current_server != NULL){
1969
server *next = mc.current_server->next;
1970
free(mc.current_server);
1971
mc.current_server = next;
1972
}
1973
}
1974
1975
/* Take down the network interface */
1976
if(take_down_interface){
1977
/* Re-raise priviliges */
1978
errno = 0;
1979
ret = seteuid(0);
1980
if(ret == -1){
1981
perror_plus("seteuid");
1982
}
1983
if(geteuid() == 0){
1984
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1985
if(ret == -1){
1986
perror_plus("ioctl SIOCGIFFLAGS");
1987
} else if(network.ifr_flags & IFF_UP) {
1988
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1989
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1990
if(ret == -1){
1991
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1992
}
1993
}
1994
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1995
if(ret == -1){
1996
perror_plus("close");
1997
}
1998
/* Lower privileges permanently */
1999
errno = 0;
2000
ret = setuid(uid);
2001
if(ret == -1){
2002
perror_plus("setuid");
2003
}
2004
}
2005
}
2006
2007
/* Removes the GPGME temp directory and all files inside */
2008
if(tempdir_created){
2009
struct dirent **direntries = NULL;
2010
struct dirent *direntry = NULL;
2011
int numentries = scandir(tempdir, &direntries, notdotentries,
2012
alphasort);
2013
if (numentries > 0){
2014
for(int i = 0; i < numentries; i++){
2015
direntry = direntries[i];
2016
char *fullname = NULL;
2017
ret = asprintf(&fullname, "%s/%s", tempdir,
2018
direntry->d_name);
2019
if(ret < 0){
2020
perror_plus("asprintf");
2021
continue;
2022
}
2023
ret = remove(fullname);
2024
if(ret == -1){
2025
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2026
strerror(errno));
2027
}
2028
free(fullname);
2029
}
2030
}
2031
2032
/* need to clean even if 0 because man page doesn't specify */
2033
free(direntries);
2034
if (numentries == -1){
2035
perror_plus("scandir");
2036
}
2037
ret = rmdir(tempdir);
2038
if(ret == -1 and errno != ENOENT){
2039
perror_plus("rmdir");
2040
}
2041
}
2042
2043
if(quit_now){
2044
sigemptyset(&old_sigterm_action.sa_mask);
2045
old_sigterm_action.sa_handler = SIG_DFL;
2046
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2047
&old_sigterm_action,
2048
NULL));
2049
if(ret == -1){
2050
perror_plus("sigaction");
2051
}
2052
do {
2053
ret = raise(signal_received);
2054
} while(ret != 0 and errno == EINTR);
2055
if(ret != 0){
2056
perror_plus("raise");
2057
abort();
2058
}
2059
TEMP_FAILURE_RETRY(pause());
2060
}
2061
2062
return exitcode;
1143
2063
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0