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- Committer: Björn Påhlsson
- Date: 2011-06-23 22:27:15 UTC
- mto: (237.7.33 trunk)
- mto: This revision was merged to the branch mainline in revision 284.
- Revision ID: belorn@fukt.bsnet.se-20110623222715-q5wro9ma9iyjl367
* Makefile (CFLAGS): Added "-lrt" to include real time library.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
* plugins.d/mandos-client.c: use scandir(3) instead of readdir(3)
Prefix all debug output with "Mandos plugin " + program_invocation_short_name
Retry servers that failed to provide password.
New option --retry SECONDS that sets the interval between rechecking.
--retry also controls how often it retries a server when using --connect.
* plugins.d/splashy.c: Prefix all debug output with "Mandos plugin " + program_invocation_short_name
* plugins.d/usplash.c: --||--
* plugins.d/askpass-fifo.c: --||--
* plugins.d/password-prompt.c: --||--
* plugins.d/plymouth.c: --||--
* mandos: Lower logger level from warning to info on failed client requests because client was disabled or unknown fingerprint.
* plugins.d/plymouth.c (get_pid): bug fix. Was not calling free on direntries.
- 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, program_invocation_short_name */
66
#include <time.h> /* nanosleep(), time(), sleep() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
65
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
68
76
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
74
91
75
92
/* Avahi */
76
93
/* All Avahi types, constants and functions
89
106
gnutls_*
90
107
init_gnutls_session(),
91
108
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
93
111
GNUTLS_OPENPGP_FMT_BASE64 */
94
112
95
113
/* GPGME */
109
127
static const char mandos_protocol_version[] = "1";
110
128
const char *argp_program_version = "mandos-client " VERSION;
111
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
130
static const char sys_class_net[] = "/sys/class/net";
131
char *connect_to = NULL;
132
133
/* Doubly linked list that need to be circular linked when ever used */
134
typedef struct server{
135
const char *ip;
136
uint16_t port;
137
AvahiIfIndex if_index;
138
int af;
139
struct timespec last_seen;
140
struct server *next;
141
struct server *prev;
142
} server;
112
143
113
144
/* Used for passing in values through the Avahi callback functions */
114
145
typedef struct {
119
150
gnutls_dh_params_t dh_params;
120
151
const char *priority;
121
152
gpgme_ctx_t ctx;
153
server *current_server;
122
154
} mandos_context;
123
155
156
/* global context so signal handler can reach it*/
157
mandos_context mc = { .simple_poll = NULL, .server = NULL,
158
.dh_bits = 1024, .priority = "SECURE256"
159
":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };
160
161
sig_atomic_t quit_now = 0;
162
int signal_received = 0;
163
164
/* Function to use when printing errors */
165
void perror_plus(const char *print_text){
166
fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);
167
perror(print_text);
168
}
169
124
170
/*
125
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
126
* "buffer_capacity" is how much is currently allocated,
171
* Make additional room in "buffer" for at least BUFFER_SIZE more
172
* bytes. "buffer_capacity" is how much is currently allocated,
127
173
* "buffer_length" is how much is already used.
128
174
*/
129
size_t adjustbuffer(char **buffer, size_t buffer_length,
175
size_t incbuffer(char **buffer, size_t buffer_length,
130
176
size_t buffer_capacity){
131
if (buffer_length + BUFFER_SIZE > buffer_capacity){
177
if(buffer_length + BUFFER_SIZE > buffer_capacity){
132
178
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
133
if (buffer == NULL){
179
if(buffer == NULL){
134
180
return 0;
135
181
}
136
182
buffer_capacity += BUFFER_SIZE;
138
184
return buffer_capacity;
139
185
}
140
186
187
int add_server(const char *ip, uint16_t port,
188
AvahiIfIndex if_index,
189
int af){
190
int ret;
191
server *new_server = malloc(sizeof(server));
192
if(new_server == NULL){
193
perror_plus("malloc");
194
return -1;
195
}
196
*new_server = (server){ .ip = strdup(ip),
197
.port = port,
198
.if_index = if_index,
199
.af = af };
200
if(new_server->ip == NULL){
201
perror_plus("strdup");
202
return -1;
203
}
204
/* uniqe case of first server */
205
if (mc.current_server == NULL){
206
new_server->next = new_server;
207
new_server->prev = new_server;
208
mc.current_server = new_server;
209
/* Placing the new server last in the list */
210
} else {
211
new_server->next = mc.current_server;
212
new_server->prev = mc.current_server->prev;
213
new_server->prev->next = new_server;
214
mc.current_server->prev = new_server;
215
}
216
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
217
if(ret == -1){
218
perror_plus("clock_gettime");
219
return -1;
220
}
221
return 0;
222
}
223
141
224
/*
142
225
* Initialize GPGME.
143
226
*/
144
static bool init_gpgme(mandos_context *mc, const char *seckey,
227
static bool init_gpgme(const char *seckey,
145
228
const char *pubkey, const char *tempdir){
146
int ret;
147
229
gpgme_error_t rc;
148
230
gpgme_engine_info_t engine_info;
149
231
150
232
151
233
/*
152
* Helper function to insert pub and seckey to the enigne keyring.
234
* Helper function to insert pub and seckey to the engine keyring.
153
235
*/
154
236
bool import_key(const char *filename){
237
int ret;
155
238
int fd;
156
239
gpgme_data_t pgp_data;
157
240
158
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
241
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
242
if(fd == -1){
160
perror("open");
243
perror_plus("open");
161
244
return false;
162
245
}
163
246
164
247
rc = gpgme_data_new_from_fd(&pgp_data, fd);
165
if (rc != GPG_ERR_NO_ERROR){
248
if(rc != GPG_ERR_NO_ERROR){
166
249
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
167
250
gpgme_strsource(rc), gpgme_strerror(rc));
168
251
return false;
169
252
}
170
253
171
rc = gpgme_op_import(mc->ctx, pgp_data);
172
if (rc != GPG_ERR_NO_ERROR){
254
rc = gpgme_op_import(mc.ctx, pgp_data);
255
if(rc != GPG_ERR_NO_ERROR){
173
256
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
174
257
gpgme_strsource(rc), gpgme_strerror(rc));
175
258
return false;
176
259
}
177
260
178
ret = TEMP_FAILURE_RETRY(close(fd));
261
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
262
if(ret == -1){
180
perror("close");
263
perror_plus("close");
181
264
}
182
265
gpgme_data_release(pgp_data);
183
266
return true;
184
267
}
185
268
186
if (debug){
187
fprintf(stderr, "Initialize gpgme\n");
269
if(debug){
270
fprintf(stderr, "Initializing GPGME\n");
188
271
}
189
272
190
273
/* Init GPGME */
191
274
gpgme_check_version(NULL);
192
275
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
193
if (rc != GPG_ERR_NO_ERROR){
276
if(rc != GPG_ERR_NO_ERROR){
194
277
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
195
278
gpgme_strsource(rc), gpgme_strerror(rc));
196
279
return false;
197
280
}
198
281
199
282
/* Set GPGME home directory for the OpenPGP engine only */
200
rc = gpgme_get_engine_info (&engine_info);
201
if (rc != GPG_ERR_NO_ERROR){
283
rc = gpgme_get_engine_info(&engine_info);
284
if(rc != GPG_ERR_NO_ERROR){
202
285
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
203
286
gpgme_strsource(rc), gpgme_strerror(rc));
204
287
return false;
217
300
}
218
301
219
302
/* Create new GPGME "context" */
220
rc = gpgme_new(&(mc->ctx));
221
if (rc != GPG_ERR_NO_ERROR){
303
rc = gpgme_new(&(mc.ctx));
304
if(rc != GPG_ERR_NO_ERROR){
222
305
fprintf(stderr, "bad gpgme_new: %s: %s\n",
223
306
gpgme_strsource(rc), gpgme_strerror(rc));
224
307
return false;
225
308
}
226
309
227
if (not import_key(pubkey) or not import_key(seckey)){
310
if(not import_key(pubkey) or not import_key(seckey)){
228
311
return false;
229
312
}
230
313
231
return true;
314
return true;
232
315
}
233
316
234
317
/*
235
318
* Decrypt OpenPGP data.
236
319
* Returns -1 on error
237
320
*/
238
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
239
const char *cryptotext,
240
size_t crypto_size,
241
char **plaintext){
321
static ssize_t pgp_packet_decrypt(const char *cryptotext,
322
size_t crypto_size,
323
char **plaintext){
242
324
gpgme_data_t dh_crypto, dh_plain;
243
325
gpgme_error_t rc;
244
326
ssize_t ret;
245
327
size_t plaintext_capacity = 0;
246
328
ssize_t plaintext_length = 0;
247
329
248
if (debug){
330
if(debug){
249
331
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
250
332
}
251
333
252
334
/* Create new GPGME data buffer from memory cryptotext */
253
335
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
254
336
0);
255
if (rc != GPG_ERR_NO_ERROR){
337
if(rc != GPG_ERR_NO_ERROR){
256
338
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
257
339
gpgme_strsource(rc), gpgme_strerror(rc));
258
340
return -1;
260
342
261
343
/* Create new empty GPGME data buffer for the plaintext */
262
344
rc = gpgme_data_new(&dh_plain);
263
if (rc != GPG_ERR_NO_ERROR){
345
if(rc != GPG_ERR_NO_ERROR){
264
346
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
265
347
gpgme_strsource(rc), gpgme_strerror(rc));
266
348
gpgme_data_release(dh_crypto);
269
351
270
352
/* Decrypt data from the cryptotext data buffer to the plaintext
271
353
data buffer */
272
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
273
if (rc != GPG_ERR_NO_ERROR){
354
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
355
if(rc != GPG_ERR_NO_ERROR){
274
356
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
275
357
gpgme_strsource(rc), gpgme_strerror(rc));
276
358
plaintext_length = -1;
277
if (debug){
359
if(debug){
278
360
gpgme_decrypt_result_t result;
279
result = gpgme_op_decrypt_result(mc->ctx);
280
if (result == NULL){
361
result = gpgme_op_decrypt_result(mc.ctx);
362
if(result == NULL){
281
363
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
282
364
} else {
283
365
fprintf(stderr, "Unsupported algorithm: %s\n",
289
371
}
290
372
gpgme_recipient_t recipient;
291
373
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
}
374
while(recipient != NULL){
375
fprintf(stderr, "Public key algorithm: %s\n",
376
gpgme_pubkey_algo_name(recipient->pubkey_algo));
377
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
378
fprintf(stderr, "Secret key available: %s\n",
379
recipient->status == GPG_ERR_NO_SECKEY
380
? "No" : "Yes");
381
recipient = recipient->next;
302
382
}
303
383
}
304
384
}
310
390
}
311
391
312
392
/* 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");
393
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
394
perror_plus("gpgme_data_seek");
315
395
plaintext_length = -1;
316
396
goto decrypt_end;
317
397
}
318
398
319
399
*plaintext = NULL;
320
400
while(true){
321
plaintext_capacity = adjustbuffer(plaintext,
401
plaintext_capacity = incbuffer(plaintext,
322
402
(size_t)plaintext_length,
323
403
plaintext_capacity);
324
if (plaintext_capacity == 0){
325
perror("adjustbuffer");
404
if(plaintext_capacity == 0){
405
perror_plus("incbuffer");
326
406
plaintext_length = -1;
327
407
goto decrypt_end;
328
408
}
330
410
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
331
411
BUFFER_SIZE);
332
412
/* Print the data, if any */
333
if (ret == 0){
413
if(ret == 0){
334
414
/* EOF */
335
415
break;
336
416
}
337
417
if(ret < 0){
338
perror("gpgme_data_read");
418
perror_plus("gpgme_data_read");
339
419
plaintext_length = -1;
340
420
goto decrypt_end;
341
421
}
360
440
return plaintext_length;
361
441
}
362
442
363
static const char * safer_gnutls_strerror (int value) {
364
const char *ret = gnutls_strerror (value); /* Spurious warning */
365
if (ret == NULL)
443
static const char * safer_gnutls_strerror(int value){
444
const char *ret = gnutls_strerror(value); /* Spurious warning from
445
-Wunreachable-code */
446
if(ret == NULL)
366
447
ret = "(unknown)";
367
448
return ret;
368
449
}
373
454
fprintf(stderr, "GnuTLS: %s", string);
374
455
}
375
456
376
static int init_gnutls_global(mandos_context *mc,
377
const char *pubkeyfilename,
457
static int init_gnutls_global(const char *pubkeyfilename,
378
458
const char *seckeyfilename){
379
459
int ret;
380
460
383
463
}
384
464
385
465
ret = gnutls_global_init();
386
if (ret != GNUTLS_E_SUCCESS) {
387
fprintf (stderr, "GnuTLS global_init: %s\n",
388
safer_gnutls_strerror(ret));
466
if(ret != GNUTLS_E_SUCCESS){
467
fprintf(stderr, "GnuTLS global_init: %s\n",
468
safer_gnutls_strerror(ret));
389
469
return -1;
390
470
}
391
471
392
if (debug){
472
if(debug){
393
473
/* "Use a log level over 10 to enable all debugging options."
394
474
* - GnuTLS manual
395
475
*/
398
478
}
399
479
400
480
/* 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 ();
481
gnutls_certificate_allocate_credentials(&mc.cred);
482
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
484
from
485
-Wunreachable-code
486
*/
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
407
489
return -1;
408
490
}
409
491
414
496
}
415
497
416
498
ret = gnutls_certificate_set_openpgp_key_file
417
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
418
500
GNUTLS_OPENPGP_FMT_BASE64);
419
if (ret != GNUTLS_E_SUCCESS) {
501
if(ret != GNUTLS_E_SUCCESS){
420
502
fprintf(stderr,
421
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
422
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
426
508
}
427
509
428
510
/* 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));
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
433
515
goto globalfail;
434
516
}
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));
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
439
521
goto globalfail;
440
522
}
441
523
442
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
525
444
526
return 0;
445
527
446
528
globalfail:
447
529
448
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
449
531
gnutls_global_deinit();
450
gnutls_dh_params_deinit(mc->dh_params);
532
gnutls_dh_params_deinit(mc.dh_params);
451
533
return -1;
452
534
}
453
535
454
static int init_gnutls_session(mandos_context *mc,
455
gnutls_session_t *session){
536
static int init_gnutls_session(gnutls_session_t *session){
456
537
int ret;
457
538
/* GnuTLS session creation */
458
ret = gnutls_init(session, GNUTLS_SERVER);
459
if (ret != GNUTLS_E_SUCCESS){
539
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
541
if(quit_now){
542
return -1;
543
}
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
if(ret != GNUTLS_E_SUCCESS){
460
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
461
547
safer_gnutls_strerror(ret));
462
548
}
463
549
464
550
{
465
551
const char *err;
466
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
467
if (ret != GNUTLS_E_SUCCESS) {
552
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
554
if(quit_now){
555
gnutls_deinit(*session);
556
return -1;
557
}
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
if(ret != GNUTLS_E_SUCCESS){
468
560
fprintf(stderr, "Syntax error at: %s\n", err);
469
561
fprintf(stderr, "GnuTLS error: %s\n",
470
562
safer_gnutls_strerror(ret));
471
gnutls_deinit (*session);
563
gnutls_deinit(*session);
472
564
return -1;
473
565
}
474
566
}
475
567
476
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
477
mc->cred);
478
if (ret != GNUTLS_E_SUCCESS) {
568
do {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
571
if(quit_now){
572
gnutls_deinit(*session);
573
return -1;
574
}
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
if(ret != GNUTLS_E_SUCCESS){
479
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
480
578
safer_gnutls_strerror(ret));
481
gnutls_deinit (*session);
579
gnutls_deinit(*session);
482
580
return -1;
483
581
}
484
582
485
583
/* ignore client certificate if any. */
486
gnutls_certificate_server_set_request (*session,
487
GNUTLS_CERT_IGNORE);
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
488
585
489
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
587
491
588
return 0;
492
589
}
498
595
/* Called when a Mandos server is found */
499
596
static int start_mandos_communication(const char *ip, uint16_t port,
500
597
AvahiIfIndex if_index,
501
mandos_context *mc){
502
int ret, tcp_sd;
503
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
598
int af){
599
int ret, tcp_sd = -1;
600
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
504
605
char *buffer = NULL;
505
char *decrypted_buffer;
606
char *decrypted_buffer = NULL;
506
607
size_t buffer_length = 0;
507
608
size_t buffer_capacity = 0;
508
ssize_t decrypted_buffer_size;
509
609
size_t written;
510
int retval = 0;
511
char interface[IF_NAMESIZE];
610
int retval = -1;
512
611
gnutls_session_t session;
513
514
ret = init_gnutls_session (mc, &session);
515
if (ret != 0){
612
int pf; /* Protocol family */
613
614
errno = 0;
615
616
if(quit_now){
617
errno = EINTR;
618
return -1;
619
}
620
621
switch(af){
622
case AF_INET6:
623
pf = PF_INET6;
624
break;
625
case AF_INET:
626
pf = PF_INET;
627
break;
628
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
return -1;
632
}
633
634
ret = init_gnutls_session(&session);
635
if(ret != 0){
516
636
return -1;
517
637
}
518
638
519
639
if(debug){
520
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
521
641
"\n", ip, port);
522
642
}
523
643
524
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
525
if(tcp_sd < 0) {
526
perror("socket");
527
return -1;
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
645
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
528
650
}
529
651
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);
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
536
655
}
537
656
538
657
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;
658
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
661
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
664
}
665
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
546
670
}
547
671
if(ret == 0){
672
int e = errno;
548
673
fprintf(stderr, "Bad address: %s\n", ip);
549
return -1;
550
}
551
to.in6.sin6_port = htons(port); /* Spurious warning */
674
errno = e;
675
goto mandos_end;
676
}
677
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
685
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
688
errno = EINVAL;
689
goto mandos_end;
690
}
691
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
693
}
694
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
698
}
552
699
553
to.in6.sin6_scope_id = (uint32_t)if_index;
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
554
704
555
705
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");
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
char interface[IF_NAMESIZE];
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
710
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
713
}
714
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
717
}
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
562
730
} else {
563
731
if(strcmp(addrstr, ip) != 0){
564
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
566
734
}
567
735
}
568
736
569
ret = connect(tcp_sd, &to.in, sizeof(to));
570
if (ret < 0){
571
perror("connect");
572
return -1;
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
573
759
}
574
760
575
761
const char *out = mandos_protocol_version;
576
762
written = 0;
577
while (true){
763
while(true){
578
764
size_t out_size = strlen(out);
579
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
766
out_size - written));
581
if (ret == -1){
582
perror("write");
583
retval = -1;
767
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
584
771
goto mandos_end;
585
772
}
586
773
written += (size_t)ret;
587
774
if(written < out_size){
588
775
continue;
589
776
} else {
590
if (out == mandos_protocol_version){
777
if(out == mandos_protocol_version){
591
778
written = 0;
592
779
out = "\r\n";
593
780
} else {
594
781
break;
595
782
}
596
783
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
597
789
}
598
790
599
791
if(debug){
600
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
601
793
}
602
794
603
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
604
605
do{
606
ret = gnutls_handshake (session);
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warnings from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
607
814
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
608
815
609
if (ret != GNUTLS_E_SUCCESS){
816
if(ret != GNUTLS_E_SUCCESS){
610
817
if(debug){
611
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
612
gnutls_perror (ret);
819
gnutls_perror(ret);
613
820
}
614
retval = -1;
821
errno = EPROTO;
615
822
goto mandos_end;
616
823
}
617
824
618
825
/* Read OpenPGP packet that contains the wanted password */
619
826
620
827
if(debug){
621
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
622
829
ip);
623
830
}
624
831
625
832
while(true){
626
buffer_capacity = adjustbuffer(&buffer, buffer_length,
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
627
840
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){
841
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
850
goto mandos_end;
851
}
852
853
sret = gnutls_record_recv(session, buffer+buffer_length,
854
BUFFER_SIZE);
855
if(sret == 0){
637
856
break;
638
857
}
639
if (ret < 0){
640
switch(ret){
858
if(sret < 0){
859
switch(sret){
641
860
case GNUTLS_E_INTERRUPTED:
642
861
case GNUTLS_E_AGAIN:
643
862
break;
644
863
case GNUTLS_E_REHANDSHAKE:
645
do{
646
ret = gnutls_handshake (session);
864
do {
865
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
647
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
648
if (ret < 0){
872
if(ret < 0){
649
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
650
gnutls_perror (ret);
651
retval = -1;
874
gnutls_perror(ret);
875
errno = EPROTO;
652
876
goto mandos_end;
653
877
}
654
878
break;
655
879
default:
656
880
fprintf(stderr, "Unknown error while reading data from"
657
881
" encrypted session with Mandos server\n");
658
retval = -1;
659
gnutls_bye (session, GNUTLS_SHUT_RDWR);
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
660
884
goto mandos_end;
661
885
}
662
886
} else {
663
buffer_length += (size_t) ret;
887
buffer_length += (size_t) sret;
664
888
}
665
889
}
666
890
668
892
fprintf(stderr, "Closing TLS session\n");
669
893
}
670
894
671
gnutls_bye (session, GNUTLS_SHUT_RDWR);
672
673
if (buffer_length > 0){
674
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
900
do {
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
if(quit_now){
903
errno = EINTR;
904
goto mandos_end;
905
}
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
907
908
if(buffer_length > 0){
909
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
911
buffer_length,
676
912
&decrypted_buffer);
677
if (decrypted_buffer_size >= 0){
913
if(decrypted_buffer_size >= 0){
914
678
915
written = 0;
679
916
while(written < (size_t) decrypted_buffer_size){
680
ret = (int)fwrite (decrypted_buffer + written, 1,
681
(size_t)decrypted_buffer_size - written,
682
stdout);
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
ret = (int)fwrite(decrypted_buffer + written, 1,
923
(size_t)decrypted_buffer_size - written,
924
stdout);
683
925
if(ret == 0 and ferror(stdout)){
926
int e = errno;
684
927
if(debug){
685
928
fprintf(stderr, "Error writing encrypted data: %s\n",
686
929
strerror(errno));
687
930
}
688
retval = -1;
689
break;
931
errno = e;
932
goto mandos_end;
690
933
}
691
934
written += (size_t)ret;
692
935
}
693
free(decrypted_buffer);
694
} else {
695
retval = -1;
936
retval = 0;
696
937
}
697
} else {
698
retval = -1;
699
938
}
700
939
701
940
/* Shutdown procedure */
702
941
703
942
mandos_end:
704
free(buffer);
705
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
706
if(ret == -1){
707
perror("close");
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
708
962
}
709
gnutls_deinit (session);
710
963
return retval;
711
964
}
712
965
713
966
static void resolve_callback(AvahiSServiceResolver *r,
714
967
AvahiIfIndex interface,
715
AVAHI_GCC_UNUSED AvahiProtocol protocol,
968
AvahiProtocol proto,
716
969
AvahiResolverEvent event,
717
970
const char *name,
718
971
const char *type,
723
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
724
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
725
978
flags,
726
void* userdata) {
727
mandos_context *mc = userdata;
979
AVAHI_GCC_UNUSED void* userdata){
728
980
assert(r);
729
981
730
982
/* Called whenever a service has been resolved successfully or
731
983
timed out */
732
984
733
switch (event) {
985
if(quit_now){
986
return;
987
}
988
989
switch(event){
734
990
default:
735
991
case AVAHI_RESOLVER_FAILURE:
736
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
737
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
738
avahi_strerror(avahi_server_errno(mc->server)));
994
avahi_strerror(avahi_server_errno(mc.server)));
739
995
break;
740
996
741
997
case AVAHI_RESOLVER_FOUND:
744
1000
avahi_address_snprint(ip, sizeof(ip), address);
745
1001
if(debug){
746
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
747
PRIu16 ") on port %d\n", name, host_name, ip,
748
interface, port);
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
749
1005
}
750
int ret = start_mandos_communication(ip, port, interface, mc);
751
if (ret == 0){
752
avahi_simple_poll_quit(mc->simple_poll);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1008
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
753
1013
}
754
1014
}
755
1015
}
756
1016
avahi_s_service_resolver_free(r);
757
1017
}
758
1018
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;
1019
static void browse_callback(AvahiSServiceBrowser *b,
1020
AvahiIfIndex interface,
1021
AvahiProtocol protocol,
1022
AvahiBrowserEvent event,
1023
const char *name,
1024
const char *type,
1025
const char *domain,
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
770
1029
assert(b);
771
1030
772
1031
/* Called whenever a new services becomes available on the LAN or
773
1032
is removed from the LAN */
774
1033
775
switch (event) {
1034
if(quit_now){
1035
return;
1036
}
1037
1038
switch(event){
776
1039
default:
777
1040
case AVAHI_BROWSER_FAILURE:
778
1041
779
1042
fprintf(stderr, "(Avahi browser) %s\n",
780
avahi_strerror(avahi_server_errno(mc->server)));
781
avahi_simple_poll_quit(mc->simple_poll);
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
782
1045
return;
783
1046
784
1047
case AVAHI_BROWSER_NEW:
787
1050
the callback function is called the Avahi server will free the
788
1051
resolver for us. */
789
1052
790
if (!(avahi_s_service_resolver_new(mc->server, interface,
791
protocol, name, type, domain,
792
AVAHI_PROTO_INET6, 0,
793
resolve_callback, mc)))
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
794
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
795
name, avahi_strerror(avahi_server_errno(mc->server)));
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
796
1058
break;
797
1059
798
1060
case AVAHI_BROWSER_REMOVE:
807
1069
}
808
1070
}
809
1071
1072
/* Signal handler that stops main loop after sigterm has been called */
1073
static void handle_sigterm(int sig){
1074
if(quit_now){
1075
return;
1076
}
1077
quit_now = 1;
1078
signal_received = sig;
1079
int old_errno = errno;
1080
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1083
}
1084
errno = old_errno;
1085
}
1086
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr, "Wait until first server is found. No timeout!\n");
1213
}
1214
ret = avahi_simple_poll_iterate(s, -1);
1215
} else {
1216
if (debug){
1217
fprintf(stderr, "Check current_server if we should run it, or wait\n");
1218
}
1219
/* the current time */
1220
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1221
if(ret == -1){
1222
perror_plus("clock_gettime");
1223
return -1;
1224
}
1225
/* Calculating in ms how long time between now and server
1226
who we visted longest time ago. Now - last seen. */
1227
waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;
1228
waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;
1229
/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */
1230
block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);
1231
1232
if (debug){
1233
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1234
}
1235
1236
if(block_time <= 0){
1237
ret = start_mandos_communication(mc.current_server->ip,
1238
mc.current_server->port,
1239
mc.current_server->if_index,
1240
mc.current_server->af);
1241
if(ret == 0){
1242
avahi_simple_poll_quit(mc.simple_poll);
1243
return 0;
1244
}
1245
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
1246
if(ret == -1){
1247
perror_plus("clock_gettime");
1248
return -1;
1249
}
1250
mc.current_server = mc.current_server->next;
1251
block_time = 0; /* call avahi to find new mandos servers, but dont block */
1252
}
1253
1254
ret = avahi_simple_poll_iterate(s, (int)block_time);
1255
}
1256
if(ret != 0){
1257
if (ret > 0 or errno != EINTR) {
1258
return (ret != 1) ? ret : 0;
1259
}
1260
}
1261
}
1262
}
1263
810
1264
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
1265
AvahiSServiceBrowser *sb = NULL;
1266
int error;
1267
int ret;
1268
intmax_t tmpmax;
1269
char *tmp;
1270
int exitcode = EXIT_SUCCESS;
1271
const char *interface = "";
1272
struct ifreq network;
1273
int sd = -1;
1274
bool take_down_interface = false;
1275
uid_t uid;
1276
gid_t gid;
1277
char tempdir[] = "/tmp/mandosXXXXXX";
1278
bool tempdir_created = false;
1279
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1280
const char *seckey = PATHDIR "/" SECKEY;
1281
const char *pubkey = PATHDIR "/" PUBKEY;
1282
1283
bool gnutls_initialized = false;
1284
bool gpgme_initialized = false;
1285
float delay = 2.5f;
1286
double retry_interval = 10; /* 10s between retrying a server and checking again*/
1287
1288
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1289
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1290
1291
uid = getuid();
1292
gid = getgid();
1293
1294
/* Lower any group privileges we might have, just to be safe */
1295
errno = 0;
1296
ret = setgid(gid);
1297
if(ret == -1){
1298
perror_plus("setgid");
1299
}
1300
1301
/* Lower user privileges (temporarily) */
1302
errno = 0;
1303
ret = seteuid(uid);
1304
if(ret == -1){
1305
perror_plus("seteuid");
1306
}
1307
1308
if(quit_now){
1309
goto end;
1310
}
1311
1312
{
1313
struct argp_option options[] = {
1314
{ .name = "debug", .key = 128,
1315
.doc = "Debug mode", .group = 3 },
1316
{ .name = "connect", .key = 'c',
1317
.arg = "ADDRESS:PORT",
1318
.doc = "Connect directly to a specific Mandos server",
1319
.group = 1 },
1320
{ .name = "interface", .key = 'i',
1321
.arg = "NAME",
1322
.doc = "Network interface that will be used to search for"
1323
" Mandos servers",
1324
.group = 1 },
1325
{ .name = "seckey", .key = 's',
1326
.arg = "FILE",
1327
.doc = "OpenPGP secret key file base name",
1328
.group = 1 },
1329
{ .name = "pubkey", .key = 'p',
1330
.arg = "FILE",
1331
.doc = "OpenPGP public key file base name",
1332
.group = 2 },
1333
{ .name = "dh-bits", .key = 129,
1334
.arg = "BITS",
1335
.doc = "Bit length of the prime number used in the"
1336
" Diffie-Hellman key exchange",
1337
.group = 2 },
1338
{ .name = "priority", .key = 130,
1339
.arg = "STRING",
1340
.doc = "GnuTLS priority string for the TLS handshake",
1341
.group = 1 },
1342
{ .name = "delay", .key = 131,
1343
.arg = "SECONDS",
1344
.doc = "Maximum delay to wait for interface startup",
1345
.group = 2 },
1346
{ .name = "retry", .key = 132,
1347
.arg = "SECONDS",
1348
.doc = "Retry interval used when denied by the mandos server",
1349
.group = 2 },
1350
/*
1351
* These reproduce what we would get without ARGP_NO_HELP
1352
*/
1353
{ .name = "help", .key = '?',
1354
.doc = "Give this help list", .group = -1 },
1355
{ .name = "usage", .key = -3,
1356
.doc = "Give a short usage message", .group = -1 },
1357
{ .name = "version", .key = 'V',
1358
.doc = "Print program version", .group = -1 },
1359
{ .name = NULL }
1360
};
1361
1362
error_t parse_opt(int key, char *arg,
1363
struct argp_state *state){
1364
errno = 0;
1365
switch(key){
1366
case 128: /* --debug */
1367
debug = true;
1368
break;
1369
case 'c': /* --connect */
1370
connect_to = arg;
1371
break;
1372
case 'i': /* --interface */
1373
interface = arg;
1374
break;
1375
case 's': /* --seckey */
1376
seckey = arg;
1377
break;
1378
case 'p': /* --pubkey */
1379
pubkey = arg;
1380
break;
1381
case 129: /* --dh-bits */
1382
errno = 0;
1383
tmpmax = strtoimax(arg, &tmp, 10);
1384
if(errno != 0 or tmp == arg or *tmp != '\0'
1385
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1386
argp_error(state, "Bad number of DH bits");
1387
}
1388
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1389
break;
1390
case 130: /* --priority */
1391
mc.priority = arg;
1392
break;
1393
case 131: /* --delay */
1394
errno = 0;
1395
delay = strtof(arg, &tmp);
1396
if(errno != 0 or tmp == arg or *tmp != '\0'){
1397
argp_error(state, "Bad delay");
1398
}
1399
case 132: /* --retry */
1400
errno = 0;
1401
retry_interval = strtod(arg, &tmp);
1402
if(errno != 0 or tmp == arg or *tmp != '\0'
1403
or (retry_interval * 1000) > INT_MAX){
1404
argp_error(state, "Bad retry interval");
1405
}
1406
break;
1407
/*
1408
* These reproduce what we would get without ARGP_NO_HELP
1409
*/
1410
case '?': /* --help */
1411
argp_state_help(state, state->out_stream,
1412
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1413
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1414
case -3: /* --usage */
1415
argp_state_help(state, state->out_stream,
1416
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1417
case 'V': /* --version */
1418
fprintf(state->out_stream, "%s\n", argp_program_version);
1419
exit(argp_err_exit_status);
1420
break;
1421
default:
1422
return ARGP_ERR_UNKNOWN;
1423
}
1424
return errno;
1425
}
1426
1427
struct argp argp = { .options = options, .parser = parse_opt,
1428
.args_doc = "",
1429
.doc = "Mandos client -- Get and decrypt"
1430
" passwords from a Mandos server" };
1431
ret = argp_parse(&argp, argc, argv,
1432
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1433
switch(ret){
1434
case 0:
1435
break;
1436
case ENOMEM:
1437
default:
1438
errno = ret;
1439
perror_plus("argp_parse");
1440
exitcode = EX_OSERR;
1441
goto end;
1442
case EINVAL:
1443
exitcode = EX_USAGE;
1444
goto end;
1445
}
1446
}
1447
1448
if(not debug){
1449
avahi_set_log_function(empty_log);
1450
}
1451
1452
if(interface[0] == '\0'){
1453
struct dirent **direntries;
1454
ret = scandir(sys_class_net, &direntries, good_interface,
1455
alphasort);
1456
if(ret >= 1){
1457
/* Pick the first good interface */
1458
interface = strdup(direntries[0]->d_name);
1459
if(debug){
1460
fprintf(stderr, "Using interface \"%s\"\n", interface);
1461
}
1462
if(interface == NULL){
1463
perror_plus("malloc");
1464
free(direntries);
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
free(direntries);
1469
} else {
1470
free(direntries);
1471
fprintf(stderr, "Could not find a network interface\n");
1472
exitcode = EXIT_FAILURE;
1473
goto end;
1474
}
1475
}
1476
1477
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1478
from the signal handler */
1479
/* Initialize the pseudo-RNG for Avahi */
1480
srand((unsigned int) time(NULL));
1481
mc.simple_poll = avahi_simple_poll_new();
1482
if(mc.simple_poll == NULL){
1483
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1484
exitcode = EX_UNAVAILABLE;
1485
goto end;
1486
}
1487
1488
sigemptyset(&sigterm_action.sa_mask);
1489
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1490
if(ret == -1){
1491
perror_plus("sigaddset");
1492
exitcode = EX_OSERR;
1493
goto end;
1494
}
1495
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1496
if(ret == -1){
1497
perror_plus("sigaddset");
1498
exitcode = EX_OSERR;
1499
goto end;
1500
}
1501
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1502
if(ret == -1){
1503
perror_plus("sigaddset");
1504
exitcode = EX_OSERR;
1505
goto end;
1506
}
1507
/* Need to check if the handler is SIG_IGN before handling:
1508
| [[info:libc:Initial Signal Actions]] |
1509
| [[info:libc:Basic Signal Handling]] |
1510
*/
1511
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1512
if(ret == -1){
1513
perror_plus("sigaction");
1514
return EX_OSERR;
1515
}
1516
if(old_sigterm_action.sa_handler != SIG_IGN){
1517
ret = sigaction(SIGINT, &sigterm_action, NULL);
1518
if(ret == -1){
1519
perror_plus("sigaction");
1520
exitcode = EX_OSERR;
1521
goto end;
1522
}
1523
}
1524
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1525
if(ret == -1){
1526
perror_plus("sigaction");
1527
return EX_OSERR;
1528
}
1529
if(old_sigterm_action.sa_handler != SIG_IGN){
1530
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1531
if(ret == -1){
1532
perror_plus("sigaction");
1533
exitcode = EX_OSERR;
1534
goto end;
1535
}
1536
}
1537
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1538
if(ret == -1){
1539
perror_plus("sigaction");
1540
return EX_OSERR;
1541
}
1542
if(old_sigterm_action.sa_handler != SIG_IGN){
1543
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1544
if(ret == -1){
1545
perror_plus("sigaction");
1546
exitcode = EX_OSERR;
1547
goto end;
1548
}
1549
}
1550
1551
/* If the interface is down, bring it up */
1552
if(strcmp(interface, "none") != 0){
984
1553
if_index = (AvahiIfIndex) if_nametoindex(interface);
985
1554
if(if_index == 0){
986
1555
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
1556
exitcode = EX_UNAVAILABLE;
1557
goto end;
1558
}
1559
1560
if(quit_now){
1561
goto end;
1562
}
1563
1564
/* Re-raise priviliges */
1565
errno = 0;
1566
ret = seteuid(0);
1567
if(ret == -1){
1568
perror_plus("seteuid");
1569
}
1570
1571
#ifdef __linux__
1572
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1573
messages about the network interface to mess up the prompt */
1574
ret = klogctl(8, NULL, 5);
1575
bool restore_loglevel = true;
1576
if(ret == -1){
1577
restore_loglevel = false;
1578
perror_plus("klogctl");
1579
}
1580
#endif /* __linux__ */
1581
1582
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1583
if(sd < 0){
1584
perror_plus("socket");
1585
exitcode = EX_OSERR;
1586
#ifdef __linux__
1587
if(restore_loglevel){
1588
ret = klogctl(7, NULL, 0);
1589
if(ret == -1){
1590
perror_plus("klogctl");
1591
}
1592
}
1593
#endif /* __linux__ */
1594
/* Lower privileges */
1595
errno = 0;
1596
ret = seteuid(uid);
1597
if(ret == -1){
1598
perror_plus("seteuid");
1599
}
1600
goto end;
1601
}
1602
strcpy(network.ifr_name, interface);
1603
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1604
if(ret == -1){
1605
perror_plus("ioctl SIOCGIFFLAGS");
1606
#ifdef __linux__
1607
if(restore_loglevel){
1608
ret = klogctl(7, NULL, 0);
1609
if(ret == -1){
1610
perror_plus("klogctl");
1611
}
1612
}
1613
#endif /* __linux__ */
1614
exitcode = EX_OSERR;
1615
/* Lower privileges */
1616
errno = 0;
1617
ret = seteuid(uid);
1618
if(ret == -1){
1619
perror_plus("seteuid");
1620
}
1621
goto end;
1622
}
1623
if((network.ifr_flags & IFF_UP) == 0){
1624
network.ifr_flags |= IFF_UP;
1625
take_down_interface = true;
1626
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1627
if(ret == -1){
1628
take_down_interface = false;
1629
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1630
exitcode = EX_OSERR;
1631
#ifdef __linux__
1632
if(restore_loglevel){
1633
ret = klogctl(7, NULL, 0);
1634
if(ret == -1){
1635
perror_plus("klogctl");
1636
}
1637
}
1638
#endif /* __linux__ */
1639
/* Lower privileges */
1640
errno = 0;
1641
ret = seteuid(uid);
1642
if(ret == -1){
1643
perror_plus("seteuid");
1644
}
1645
goto end;
1646
}
1647
}
1648
/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */
1649
for(int i=0; i < delay * 4; i++){
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1651
if(ret == -1){
1652
perror_plus("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_RUNNING){
1654
break;
1655
}
1656
struct timespec sleeptime = { .tv_nsec = 250000000 };
1657
ret = nanosleep(&sleeptime, NULL);
1658
if(ret == -1 and errno != EINTR){
1659
perror_plus("nanosleep");
1660
}
1661
}
1662
if(not take_down_interface){
1663
/* We won't need the socket anymore */
1664
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1665
if(ret == -1){
1666
perror_plus("close");
1667
}
1668
}
1669
#ifdef __linux__
1670
if(restore_loglevel){
1671
/* Restores kernel loglevel to default */
1672
ret = klogctl(7, NULL, 0);
1673
if(ret == -1){
1674
perror_plus("klogctl");
1675
}
1676
}
1677
#endif /* __linux__ */
1678
/* Lower privileges */
1679
errno = 0;
1680
if(take_down_interface){
1681
/* Lower privileges */
1682
ret = seteuid(uid);
1683
if(ret == -1){
1684
perror_plus("seteuid");
1685
}
1686
} else {
1687
/* Lower privileges permanently */
1688
ret = setuid(uid);
1689
if(ret == -1){
1690
perror_plus("setuid");
1691
}
1692
}
1693
}
1694
1695
if(quit_now){
1696
goto end;
1697
}
1698
1699
ret = init_gnutls_global(pubkey, seckey);
1700
if(ret == -1){
1701
fprintf(stderr, "init_gnutls_global failed\n");
1702
exitcode = EX_UNAVAILABLE;
1703
goto end;
1704
} else {
1705
gnutls_initialized = true;
1706
}
1707
1708
if(quit_now){
1709
goto end;
1710
}
1711
1712
if(mkdtemp(tempdir) == NULL){
1713
perror_plus("mkdtemp");
1714
goto end;
1715
}
1716
tempdir_created = true;
1717
1718
if(quit_now){
1719
goto end;
1720
}
1721
1722
if(not init_gpgme(pubkey, seckey, tempdir)){
1723
fprintf(stderr, "init_gpgme failed\n");
1724
exitcode = EX_UNAVAILABLE;
1725
goto end;
1726
} else {
1727
gpgme_initialized = true;
1728
}
1729
1730
if(quit_now){
1731
goto end;
1732
}
1733
1734
if(connect_to != NULL){
1735
/* Connect directly, do not use Zeroconf */
1736
/* (Mainly meant for debugging) */
1737
char *address = strrchr(connect_to, ':');
1738
if(address == NULL){
1739
fprintf(stderr, "No colon in address\n");
1740
exitcode = EX_USAGE;
1741
goto end;
1742
}
1743
1744
if(quit_now){
1745
goto end;
1746
}
1747
1748
uint16_t port;
1749
errno = 0;
1750
tmpmax = strtoimax(address+1, &tmp, 10);
1751
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1752
or tmpmax != (uint16_t)tmpmax){
1753
fprintf(stderr, "Bad port number\n");
1754
exitcode = EX_USAGE;
1755
goto end;
1756
}
1757
1758
if(quit_now){
1759
goto end;
1760
}
1761
1762
port = (uint16_t)tmpmax;
1763
*address = '\0';
1764
address = connect_to;
1765
/* Colon in address indicates IPv6 */
1766
int af;
1767
if(strchr(address, ':') != NULL){
1768
af = AF_INET6;
1769
} else {
1770
af = AF_INET;
1771
}
1772
1773
if(quit_now){
1774
goto end;
1775
}
1776
1777
while(not quit_now){
1778
ret = start_mandos_communication(address, port, if_index, af);
1779
if(quit_now or ret == 0){
1780
break;
1781
}
1782
sleep((int)retry_interval or 1);
1783
};
1784
1785
if (not quit_now){
1786
exitcode = EXIT_SUCCESS;
1787
}
1788
1789
goto end;
1790
}
1791
1792
if(quit_now){
1793
goto end;
1794
}
1795
1796
{
1797
AvahiServerConfig config;
1798
/* Do not publish any local Zeroconf records */
1799
avahi_server_config_init(&config);
1800
config.publish_hinfo = 0;
1801
config.publish_addresses = 0;
1802
config.publish_workstation = 0;
1803
config.publish_domain = 0;
1804
1805
/* Allocate a new server */
1806
mc.server = avahi_server_new(avahi_simple_poll_get
1807
(mc.simple_poll), &config, NULL,
1808
NULL, &error);
1809
1810
/* Free the Avahi configuration data */
1811
avahi_server_config_free(&config);
1812
}
1813
1814
/* Check if creating the Avahi server object succeeded */
1815
if(mc.server == NULL){
1816
fprintf(stderr, "Failed to create Avahi server: %s\n",
1817
avahi_strerror(error));
1818
exitcode = EX_UNAVAILABLE;
1819
goto end;
1820
}
1821
1822
if(quit_now){
1823
goto end;
1824
}
1825
1826
/* Create the Avahi service browser */
1827
sb = avahi_s_service_browser_new(mc.server, if_index,
1828
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1829
NULL, 0, browse_callback, NULL);
1830
if(sb == NULL){
1831
fprintf(stderr, "Failed to create service browser: %s\n",
1832
avahi_strerror(avahi_server_errno(mc.server)));
1833
exitcode = EX_UNAVAILABLE;
1834
goto end;
1835
}
1836
1837
if(quit_now){
1838
goto end;
1839
}
1840
1841
/* Run the main loop */
1842
1843
if(debug){
1844
fprintf(stderr, "Starting Avahi loop search\n");
1845
}
1846
1847
ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));
1848
if(debug){
1849
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1850
(ret == 0) ? "successfully" : "with error");
1851
}
1852
1079
1853
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;
1854
1855
if(debug){
1856
fprintf(stderr, "%s exiting\n", argv[0]);
1857
}
1858
1859
/* Cleanup things */
1860
if(sb != NULL)
1861
avahi_s_service_browser_free(sb);
1862
1863
if(mc.server != NULL)
1864
avahi_server_free(mc.server);
1865
1866
if(mc.simple_poll != NULL)
1867
avahi_simple_poll_free(mc.simple_poll);
1868
1869
if(gnutls_initialized){
1870
gnutls_certificate_free_credentials(mc.cred);
1871
gnutls_global_deinit();
1872
gnutls_dh_params_deinit(mc.dh_params);
1873
}
1874
1875
if(gpgme_initialized){
1876
gpgme_release(mc.ctx);
1877
}
1878
1879
/* cleans up the circular linked list of mandos servers the client has seen */
1880
if(mc.current_server != NULL){
1881
mc.current_server->prev->next = NULL;
1882
while(mc.current_server != NULL){
1883
server *next = mc.current_server->next;
1884
free(mc.current_server);
1885
mc.current_server = next;
1886
}
1887
}
1888
1889
/* Take down the network interface */
1890
if(take_down_interface){
1891
/* Re-raise priviliges */
1892
errno = 0;
1893
ret = seteuid(0);
1894
if(ret == -1){
1895
perror_plus("seteuid");
1896
}
1897
if(geteuid() == 0){
1898
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1899
if(ret == -1){
1900
perror_plus("ioctl SIOCGIFFLAGS");
1901
} else if(network.ifr_flags & IFF_UP) {
1902
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1903
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1904
if(ret == -1){
1905
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1906
}
1907
}
1908
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1909
if(ret == -1){
1910
perror_plus("close");
1911
}
1912
/* Lower privileges permanently */
1913
errno = 0;
1914
ret = setuid(uid);
1915
if(ret == -1){
1916
perror_plus("setuid");
1917
}
1918
}
1919
}
1920
1921
/* Removes the GPGME temp directory and all files inside */
1922
if(tempdir_created){
1923
struct dirent **direntries = NULL;
1924
struct dirent *direntry = NULL;
1925
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1926
if (ret > 0){
1927
for(int i = 0; i < ret; i++){
1928
direntry = direntries[i];
1929
char *fullname = NULL;
1930
ret = asprintf(&fullname, "%s/%s", tempdir,
1931
direntry->d_name);
1932
if(ret < 0){
1933
perror_plus("asprintf");
1934
continue;
1935
}
1936
ret = remove(fullname);
1937
if(ret == -1){
1938
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1939
strerror(errno));
1940
}
1941
free(fullname);
1942
}
1943
}
1944
1945
/* need to be cleaned even if ret == 0 because man page dont specify */
1946
free(direntries);
1947
if (ret == -1){
1948
perror_plus("scandir");
1949
}
1950
ret = rmdir(tempdir);
1951
if(ret == -1 and errno != ENOENT){
1952
perror_plus("rmdir");
1953
}
1954
}
1955
1956
if(quit_now){
1957
sigemptyset(&old_sigterm_action.sa_mask);
1958
old_sigterm_action.sa_handler = SIG_DFL;
1959
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1960
&old_sigterm_action,
1961
NULL));
1962
if(ret == -1){
1963
perror_plus("sigaction");
1964
}
1965
do {
1966
ret = raise(signal_received);
1967
} while(ret != 0 and errno == EINTR);
1968
if(ret != 0){
1969
perror_plus("raise");
1970
abort();
1971
}
1972
TEMP_FAILURE_RETRY(pause());
1973
}
1974
1975
return exitcode;
1143
1976
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0