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- Committer: Teddy Hogeborn
- Date: 2008-09-19 20:54:58 UTC
- Revision ID: teddy@fukt.bsnet.se-20080919205458-f90xsypwa6k7fby1
* debian/control (mandos-client): Depend on "cryptsetup".
* debian/mandos-client.README.Debian: Add the text from
"etc-plugins.d-README".
* debian/mandos-client.postrm (purge): Hide failures.
* etc-plugins.d-README: Removed.
* debian/mandos-client.README.Debian: Add the text from
"etc-plugins.d-README".
* debian/mandos-client.postrm (purge): Hide failures.
* etc-plugins.d-README: Removed.
- files added:
- plugins.d/usplash
- files removed:
- NEWS
- debian/po
- 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 © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
56
51
#include <sys/stat.h> /* open() */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
53
struct in6_addr, inet_pton(),
54
connect() */
59
55
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
64
58
#include <assert.h> /* assert() */
65
59
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
60
#include <time.h> /* time() */
67
61
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
62
SIOCSIFFLAGS, if_indextoname(),
69
63
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
64
#include <netinet/in.h>
73
65
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
66
getuid(), getgid(), setuid(),
75
67
setgid() */
76
68
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
69
#include <iso646.h> /* not, and */
78
70
#include <argp.h> /* struct argp_option, error_t, struct
79
71
argp_state, struct argp,
80
72
argp_parse(), ARGP_KEY_ARG,
81
73
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
74
90
75
/* Avahi */
91
76
/* All Avahi types, constants and functions
104
89
gnutls_*
105
90
init_gnutls_session(),
106
91
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
93
GNUTLS_OPENPGP_FMT_BASE64 */
110
94
111
95
/* GPGME */
117
101
118
102
#define BUFFER_SIZE 256
119
103
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
120
108
#define PATHDIR "/conf/conf.d/mandos"
121
109
#define SECKEY "seckey.txt"
122
110
#define PUBKEY "pubkey.txt"
123
111
124
112
bool debug = false;
125
113
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
114
const char *argp_program_version = "mandos-client 1.0";
127
115
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
116
129
117
/* Used for passing in values through the Avahi callback functions */
137
125
gpgme_ctx_t ctx;
138
126
} mandos_context;
139
127
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
128
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
148
131
* "buffer_length" is how much is already used.
149
132
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
134
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
136
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
137
if (buffer == NULL){
155
138
return 0;
156
139
}
157
140
buffer_capacity += BUFFER_SIZE;
162
145
/*
163
146
* Initialize GPGME.
164
147
*/
165
static bool init_gpgme(const char *seckey,
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
166
149
const char *pubkey, const char *tempdir){
167
150
int ret;
168
151
gpgme_error_t rc;
170
153
171
154
172
155
/*
173
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
174
157
*/
175
158
bool import_key(const char *filename){
176
159
int fd;
177
160
gpgme_data_t pgp_data;
178
161
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
163
if(fd == -1){
181
164
perror("open");
182
165
return false;
183
166
}
184
167
185
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
169
if (rc != GPG_ERR_NO_ERROR){
187
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
171
gpgme_strsource(rc), gpgme_strerror(rc));
189
172
return false;
190
173
}
191
174
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
194
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
178
gpgme_strsource(rc), gpgme_strerror(rc));
196
179
return false;
197
180
}
198
181
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
182
ret = TEMP_FAILURE_RETRY(close(fd));
200
183
if(ret == -1){
201
184
perror("close");
202
185
}
204
187
return true;
205
188
}
206
189
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
209
192
}
210
193
211
194
/* Init GPGME */
212
195
gpgme_check_version(NULL);
213
196
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
197
if (rc != GPG_ERR_NO_ERROR){
215
198
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
199
gpgme_strsource(rc), gpgme_strerror(rc));
217
200
return false;
218
201
}
219
202
220
203
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
223
206
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
207
gpgme_strsource(rc), gpgme_strerror(rc));
225
208
return false;
238
221
}
239
222
240
223
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
243
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
227
gpgme_strsource(rc), gpgme_strerror(rc));
245
228
return false;
246
229
}
247
230
248
if(not import_key(pubkey) or not import_key(seckey)){
231
if (not import_key(pubkey) or not import_key(seckey)){
249
232
return false;
250
233
}
251
234
256
239
* Decrypt OpenPGP data.
257
240
* Returns -1 on error
258
241
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
262
246
gpgme_data_t dh_crypto, dh_plain;
263
247
gpgme_error_t rc;
264
248
ssize_t ret;
265
249
size_t plaintext_capacity = 0;
266
250
ssize_t plaintext_length = 0;
267
251
268
if(debug){
252
if (debug){
269
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
270
254
}
271
255
272
256
/* Create new GPGME data buffer from memory cryptotext */
273
257
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
258
0);
275
if(rc != GPG_ERR_NO_ERROR){
259
if (rc != GPG_ERR_NO_ERROR){
276
260
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
261
gpgme_strsource(rc), gpgme_strerror(rc));
278
262
return -1;
280
264
281
265
/* Create new empty GPGME data buffer for the plaintext */
282
266
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
267
if (rc != GPG_ERR_NO_ERROR){
284
268
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
269
gpgme_strsource(rc), gpgme_strerror(rc));
286
270
gpgme_data_release(dh_crypto);
289
273
290
274
/* Decrypt data from the cryptotext data buffer to the plaintext
291
275
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
294
278
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
279
gpgme_strsource(rc), gpgme_strerror(rc));
296
280
plaintext_length = -1;
297
if(debug){
281
if (debug){
298
282
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
301
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
286
} else {
303
287
fprintf(stderr, "Unsupported algorithm: %s\n",
309
293
}
310
294
gpgme_recipient_t recipient;
311
295
recipient = result->recipients;
312
while(recipient != NULL){
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
318
? "No" : "Yes");
319
recipient = recipient->next;
296
if(recipient){
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
303
? "No" : "Yes");
304
recipient = recipient->next;
305
}
320
306
}
321
307
}
322
308
}
328
314
}
329
315
330
316
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
332
318
perror("gpgme_data_seek");
333
319
plaintext_length = -1;
334
320
goto decrypt_end;
336
322
337
323
*plaintext = NULL;
338
324
while(true){
339
plaintext_capacity = incbuffer(plaintext,
325
plaintext_capacity = adjustbuffer(plaintext,
340
326
(size_t)plaintext_length,
341
327
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
344
330
plaintext_length = -1;
345
331
goto decrypt_end;
346
332
}
348
334
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
335
BUFFER_SIZE);
350
336
/* Print the data, if any */
351
if(ret == 0){
337
if (ret == 0){
352
338
/* EOF */
353
339
break;
354
340
}
378
364
return plaintext_length;
379
365
}
380
366
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
385
370
ret = "(unknown)";
386
371
return ret;
387
372
}
392
377
fprintf(stderr, "GnuTLS: %s", string);
393
378
}
394
379
395
static int init_gnutls_global(const char *pubkeyfilename,
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
396
382
const char *seckeyfilename){
397
383
int ret;
398
384
401
387
}
402
388
403
389
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
407
393
return -1;
408
394
}
409
395
410
if(debug){
396
if (debug){
411
397
/* "Use a log level over 10 to enable all debugging options."
412
398
* - GnuTLS manual
413
399
*/
416
402
}
417
403
418
404
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
405
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
gnutls_global_deinit ();
427
411
return -1;
428
412
}
429
413
434
418
}
435
419
436
420
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
421
(mc->cred, pubkeyfilename, seckeyfilename,
438
422
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
423
if (ret != GNUTLS_E_SUCCESS) {
440
424
fprintf(stderr,
441
425
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
430
}
447
431
448
432
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
433
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %s\n", safer_gnutls_strerror(ret));
453
437
goto globalfail;
454
438
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
439
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
safer_gnutls_strerror(ret));
459
443
goto globalfail;
460
444
}
461
445
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
447
464
448
return 0;
465
449
466
450
globalfail:
467
451
468
gnutls_certificate_free_credentials(mc.cred);
452
gnutls_certificate_free_credentials(mc->cred);
469
453
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
454
gnutls_dh_params_deinit(mc->dh_params);
471
455
return -1;
472
456
}
473
457
474
static int init_gnutls_session(gnutls_session_t *session){
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
475
460
int ret;
476
461
/* GnuTLS session creation */
477
462
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
463
if (ret != GNUTLS_E_SUCCESS){
479
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
465
safer_gnutls_strerror(ret));
481
466
}
482
467
483
468
{
484
469
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
487
472
fprintf(stderr, "Syntax error at: %s\n", err);
488
473
fprintf(stderr, "GnuTLS error: %s\n",
489
474
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
475
gnutls_deinit (*session);
491
476
return -1;
492
477
}
493
478
}
494
479
495
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
498
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
484
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
485
gnutls_deinit (*session);
501
486
return -1;
502
487
}
503
488
504
489
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
507
492
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
494
510
495
return 0;
511
496
}
517
502
/* Called when a Mandos server is found */
518
503
static int start_mandos_communication(const char *ip, uint16_t port,
519
504
AvahiIfIndex if_index,
520
int af){
505
mandos_context *mc){
521
506
int ret, tcp_sd;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
527
508
char *buffer = NULL;
528
509
char *decrypted_buffer;
529
510
size_t buffer_length = 0;
531
512
ssize_t decrypted_buffer_size;
532
513
size_t written;
533
514
int retval = 0;
515
char interface[IF_NAMESIZE];
534
516
gnutls_session_t session;
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
551
520
return -1;
552
521
}
553
522
554
523
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
556
525
"\n", ip, port);
557
526
}
558
527
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
561
530
perror("socket");
562
531
return -1;
563
532
}
564
533
534
if(debug){
535
if(if_indextoname((unsigned int)if_index, interface) == NULL){
536
perror("if_indextoname");
537
return -1;
538
}
539
fprintf(stderr, "Binding to interface %s\n", interface);
540
}
541
565
542
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
543
to.in6.sin6_family = AF_INET6;
544
/* It would be nice to have a way to detect if we were passed an
545
IPv4 address here. Now we assume an IPv6 address. */
546
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
547
if (ret < 0 ){
574
548
perror("inet_pton");
575
549
return -1;
576
550
}
578
552
fprintf(stderr, "Bad address: %s\n", ip);
579
553
return -1;
580
554
}
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
556
557
to.in6.sin6_scope_id = (uint32_t)if_index;
602
558
603
559
if(debug){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
561
port);
562
char addrstr[INET6_ADDRSTRLEN] = "";
563
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
sizeof(addrstr)) == NULL){
627
565
perror("inet_ntop");
628
566
} else {
629
567
if(strcmp(addrstr, ip) != 0){
632
570
}
633
571
}
634
572
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
641
575
perror("connect");
642
576
return -1;
643
577
}
644
578
645
579
const char *out = mandos_protocol_version;
646
580
written = 0;
647
while(true){
581
while (true){
648
582
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
584
out_size - written));
651
if(ret == -1){
585
if (ret == -1){
652
586
perror("write");
653
587
retval = -1;
654
588
goto mandos_end;
657
591
if(written < out_size){
658
592
continue;
659
593
} else {
660
if(out == mandos_protocol_version){
594
if (out == mandos_protocol_version){
661
595
written = 0;
662
596
out = "\r\n";
663
597
} else {
670
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
605
}
672
606
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
674
608
675
609
do{
676
ret = gnutls_handshake(session);
610
ret = gnutls_handshake (session);
677
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
612
679
if(ret != GNUTLS_E_SUCCESS){
613
if (ret != GNUTLS_E_SUCCESS){
680
614
if(debug){
681
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
682
gnutls_perror(ret);
616
gnutls_perror (ret);
683
617
}
684
618
retval = -1;
685
619
goto mandos_end;
688
622
/* Read OpenPGP packet that contains the wanted password */
689
623
690
624
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
626
ip);
693
627
}
694
628
695
629
while(true){
696
buffer_capacity = incbuffer(&buffer, buffer_length,
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
697
631
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
700
634
retval = -1;
701
635
goto mandos_end;
702
636
}
703
637
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
707
641
break;
708
642
}
709
if(sret < 0){
710
switch(sret){
643
if (ret < 0){
644
switch(ret){
711
645
case GNUTLS_E_INTERRUPTED:
712
646
case GNUTLS_E_AGAIN:
713
647
break;
714
648
case GNUTLS_E_REHANDSHAKE:
715
649
do{
716
ret = gnutls_handshake(session);
650
ret = gnutls_handshake (session);
717
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
652
if (ret < 0){
719
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
720
gnutls_perror(ret);
654
gnutls_perror (ret);
721
655
retval = -1;
722
656
goto mandos_end;
723
657
}
726
660
fprintf(stderr, "Unknown error while reading data from"
727
661
" encrypted session with Mandos server\n");
728
662
retval = -1;
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
730
664
goto mandos_end;
731
665
}
732
666
} else {
733
buffer_length += (size_t) sret;
667
buffer_length += (size_t) ret;
734
668
}
735
669
}
736
670
738
672
fprintf(stderr, "Closing TLS session\n");
739
673
}
740
674
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
742
676
743
if(buffer_length > 0){
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
745
679
buffer_length,
746
680
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
681
if (decrypted_buffer_size >= 0){
748
682
written = 0;
749
683
while(written < (size_t) decrypted_buffer_size){
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
753
687
if(ret == 0 and ferror(stdout)){
754
688
if(debug){
755
689
fprintf(stderr, "Error writing encrypted data: %s\n",
772
706
773
707
mandos_end:
774
708
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
776
710
if(ret == -1){
777
711
perror("close");
778
712
}
779
gnutls_deinit(session);
713
gnutls_deinit (session);
780
714
return retval;
781
715
}
782
716
783
sig_atomic_t quit_now = 0;
784
785
717
static void resolve_callback(AvahiSServiceResolver *r,
786
718
AvahiIfIndex interface,
787
AvahiProtocol proto,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
788
720
AvahiResolverEvent event,
789
721
const char *name,
790
722
const char *type,
795
727
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
728
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
729
flags,
798
AVAHI_GCC_UNUSED void* userdata){
730
void* userdata) {
731
mandos_context *mc = userdata;
799
732
assert(r);
800
733
801
734
/* Called whenever a service has been resolved successfully or
802
735
timed out */
803
736
804
if(quit_now){
805
return;
806
}
807
808
switch(event){
737
switch (event) {
809
738
default:
810
739
case AVAHI_RESOLVER_FAILURE:
811
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
812
741
" of type '%s' in domain '%s': %s\n", name, type, domain,
813
avahi_strerror(avahi_server_errno(mc.server)));
742
avahi_strerror(avahi_server_errno(mc->server)));
814
743
break;
815
744
816
745
case AVAHI_RESOLVER_FOUND:
819
748
avahi_address_snprint(ip, sizeof(ip), address);
820
749
if(debug){
821
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
822
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
823
ip, (intmax_t)interface, port);
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
824
753
}
825
int ret = start_mandos_communication(ip, port, interface,
826
avahi_proto_to_af(proto));
827
if(ret == 0){
828
avahi_simple_poll_quit(mc.simple_poll);
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
829
757
}
830
758
}
831
759
}
832
760
avahi_s_service_resolver_free(r);
833
761
}
834
762
835
static void browse_callback(AvahiSServiceBrowser *b,
836
AvahiIfIndex interface,
837
AvahiProtocol protocol,
838
AvahiBrowserEvent event,
839
const char *name,
840
const char *type,
841
const char *domain,
842
AVAHI_GCC_UNUSED AvahiLookupResultFlags
843
flags,
844
AVAHI_GCC_UNUSED void* userdata){
763
static void browse_callback( AvahiSServiceBrowser *b,
764
AvahiIfIndex interface,
765
AvahiProtocol protocol,
766
AvahiBrowserEvent event,
767
const char *name,
768
const char *type,
769
const char *domain,
770
AVAHI_GCC_UNUSED AvahiLookupResultFlags
771
flags,
772
void* userdata) {
773
mandos_context *mc = userdata;
845
774
assert(b);
846
775
847
776
/* Called whenever a new services becomes available on the LAN or
848
777
is removed from the LAN */
849
778
850
switch(event){
779
switch (event) {
851
780
default:
852
781
case AVAHI_BROWSER_FAILURE:
853
782
854
783
fprintf(stderr, "(Avahi browser) %s\n",
855
avahi_strerror(avahi_server_errno(mc.server)));
856
avahi_simple_poll_quit(mc.simple_poll);
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
857
786
return;
858
787
859
788
case AVAHI_BROWSER_NEW:
862
791
the callback function is called the Avahi server will free the
863
792
resolver for us. */
864
793
865
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
866
name, type, domain, protocol, 0,
867
resolve_callback, NULL) == NULL)
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
868
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
869
name, avahi_strerror(avahi_server_errno(mc.server)));
799
name, avahi_strerror(avahi_server_errno(mc->server)));
870
800
break;
871
801
872
802
case AVAHI_BROWSER_REMOVE:
881
811
}
882
812
}
883
813
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
886
if(quit_now){
887
return;
888
}
889
quit_now = 1;
890
int old_errno = errno;
891
if(mc.simple_poll != NULL){
892
avahi_simple_poll_quit(mc.simple_poll);
893
}
894
errno = old_errno;
895
}
896
897
814
int main(int argc, char *argv[]){
898
AvahiSServiceBrowser *sb = NULL;
899
int error;
900
int ret;
901
intmax_t tmpmax;
902
char *tmp;
903
int exitcode = EXIT_SUCCESS;
904
const char *interface = "eth0";
905
struct ifreq network;
906
int sd = -1;
907
bool take_down_interface = false;
908
uid_t uid;
909
gid_t gid;
910
char *connect_to = NULL;
911
char tempdir[] = "/tmp/mandosXXXXXX";
912
bool tempdir_created = false;
913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
const char *seckey = PATHDIR "/" SECKEY;
915
const char *pubkey = PATHDIR "/" PUBKEY;
916
917
bool gnutls_initialized = false;
918
bool gpgme_initialized = false;
919
float delay = 2.5f;
920
921
struct sigaction old_sigterm_action;
922
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
923
924
{
925
struct argp_option options[] = {
926
{ .name = "debug", .key = 128,
927
.doc = "Debug mode", .group = 3 },
928
{ .name = "connect", .key = 'c',
929
.arg = "ADDRESS:PORT",
930
.doc = "Connect directly to a specific Mandos server",
931
.group = 1 },
932
{ .name = "interface", .key = 'i',
933
.arg = "NAME",
934
.doc = "Network interface that will be used to search for"
935
" Mandos servers",
936
.group = 1 },
937
{ .name = "seckey", .key = 's',
938
.arg = "FILE",
939
.doc = "OpenPGP secret key file base name",
940
.group = 1 },
941
{ .name = "pubkey", .key = 'p',
942
.arg = "FILE",
943
.doc = "OpenPGP public key file base name",
944
.group = 2 },
945
{ .name = "dh-bits", .key = 129,
946
.arg = "BITS",
947
.doc = "Bit length of the prime number used in the"
948
" Diffie-Hellman key exchange",
949
.group = 2 },
950
{ .name = "priority", .key = 130,
951
.arg = "STRING",
952
.doc = "GnuTLS priority string for the TLS handshake",
953
.group = 1 },
954
{ .name = "delay", .key = 131,
955
.arg = "SECONDS",
956
.doc = "Maximum delay to wait for interface startup",
957
.group = 2 },
958
{ .name = NULL }
959
};
960
961
error_t parse_opt(int key, char *arg,
962
struct argp_state *state){
963
switch(key){
964
case 128: /* --debug */
965
debug = true;
966
break;
967
case 'c': /* --connect */
968
connect_to = arg;
969
break;
970
case 'i': /* --interface */
971
interface = arg;
972
break;
973
case 's': /* --seckey */
974
seckey = arg;
975
break;
976
case 'p': /* --pubkey */
977
pubkey = arg;
978
break;
979
case 129: /* --dh-bits */
980
errno = 0;
981
tmpmax = strtoimax(arg, &tmp, 10);
982
if(errno != 0 or tmp == arg or *tmp != '\0'
983
or tmpmax != (typeof(mc.dh_bits))tmpmax){
984
fprintf(stderr, "Bad number of DH bits\n");
985
exit(EXIT_FAILURE);
986
}
987
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
988
break;
989
case 130: /* --priority */
990
mc.priority = arg;
991
break;
992
case 131: /* --delay */
993
errno = 0;
994
delay = strtof(arg, &tmp);
995
if(errno != 0 or tmp == arg or *tmp != '\0'){
996
fprintf(stderr, "Bad delay\n");
997
exit(EXIT_FAILURE);
998
}
999
break;
1000
case ARGP_KEY_ARG:
1001
argp_usage(state);
1002
case ARGP_KEY_END:
1003
break;
1004
default:
1005
return ARGP_ERR_UNKNOWN;
1006
}
1007
return 0;
1008
}
1009
1010
struct argp argp = { .options = options, .parser = parse_opt,
1011
.args_doc = "",
1012
.doc = "Mandos client -- Get and decrypt"
1013
" passwords from a Mandos server" };
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
}
1021
1022
if(not debug){
1023
avahi_set_log_function(empty_log);
1024
}
1025
1026
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1027
from the signal handler */
1028
/* Initialize the pseudo-RNG for Avahi */
1029
srand((unsigned int) time(NULL));
1030
mc.simple_poll = avahi_simple_poll_new();
1031
if(mc.simple_poll == NULL){
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
sigemptyset(&sigterm_action.sa_mask);
1038
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1039
if(ret == -1){
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
1042
goto end;
1043
}
1044
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1045
if(ret == -1){
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
1048
goto end;
1049
}
1050
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1051
if(ret == -1){
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1054
goto end;
1055
}
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1057
if(ret == -1){
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* If the interface is down, bring it up */
1064
if(interface[0] != '\0'){
815
AvahiSServiceBrowser *sb = NULL;
816
int error;
817
int ret;
818
int exitcode = EXIT_SUCCESS;
819
const char *interface = "eth0";
820
struct ifreq network;
821
int sd;
822
uid_t uid;
823
gid_t gid;
824
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
829
830
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
833
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
835
836
{
837
struct argp_option options[] = {
838
{ .name = "debug", .key = 128,
839
.doc = "Debug mode", .group = 3 },
840
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
843
.group = 1 },
844
{ .name = "interface", .key = 'i',
845
.arg = "NAME",
846
.doc = "Interface that will be used to search for Mandos"
847
" servers",
848
.group = 1 },
849
{ .name = "seckey", .key = 's',
850
.arg = "FILE",
851
.doc = "OpenPGP secret key file base name",
852
.group = 1 },
853
{ .name = "pubkey", .key = 'p',
854
.arg = "FILE",
855
.doc = "OpenPGP public key file base name",
856
.group = 2 },
857
{ .name = "dh-bits", .key = 129,
858
.arg = "BITS",
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
861
.group = 2 },
862
{ .name = "priority", .key = 130,
863
.arg = "STRING",
864
.doc = "GnuTLS priority string for the TLS handshake",
865
.group = 1 },
866
{ .name = NULL }
867
};
868
869
error_t parse_opt (int key, char *arg,
870
struct argp_state *state) {
871
/* Get the INPUT argument from `argp_parse', which we know is
872
a pointer to our plugin list pointer. */
873
switch (key) {
874
case 128: /* --debug */
875
debug = true;
876
break;
877
case 'c': /* --connect */
878
connect_to = arg;
879
break;
880
case 'i': /* --interface */
881
interface = arg;
882
break;
883
case 's': /* --seckey */
884
seckey = arg;
885
break;
886
case 'p': /* --pubkey */
887
pubkey = arg;
888
break;
889
case 129: /* --dh-bits */
890
errno = 0;
891
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
892
if (errno){
893
perror("strtol");
894
exit(EXIT_FAILURE);
895
}
896
break;
897
case 130: /* --priority */
898
mc.priority = arg;
899
break;
900
case ARGP_KEY_ARG:
901
argp_usage (state);
902
case ARGP_KEY_END:
903
break;
904
default:
905
return ARGP_ERR_UNKNOWN;
906
}
907
return 0;
908
}
909
910
struct argp argp = { .options = options, .parser = parse_opt,
911
.args_doc = "",
912
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
914
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
918
goto end;
919
}
920
}
921
922
/* If the interface is down, bring it up */
923
{
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
925
if(sd < 0) {
926
perror("socket");
927
exitcode = EXIT_FAILURE;
928
goto end;
929
}
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
932
if(ret == -1){
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
940
if(ret == -1){
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
943
goto end;
944
}
945
}
946
ret = TEMP_FAILURE_RETRY(close(sd));
947
if(ret == -1){
948
perror("close");
949
}
950
}
951
952
uid = getuid();
953
gid = getgid();
954
955
ret = setuid(uid);
956
if (ret == -1){
957
perror("setuid");
958
}
959
960
setgid(gid);
961
if (ret == -1){
962
perror("setgid");
963
}
964
965
ret = init_gnutls_global(&mc, pubkey, seckey);
966
if (ret == -1){
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
969
goto end;
970
} else {
971
gnutls_initalized = true;
972
}
973
974
if(mkdtemp(tempdir) == NULL){
975
perror("mkdtemp");
976
tempdir[0] = '\0';
977
goto end;
978
}
979
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
} else {
985
gpgme_initalized = true;
986
}
987
1065
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
1066
989
if(if_index == 0){
1067
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
if(quit_now){
1073
goto end;
1074
}
1075
1076
#ifdef __linux__
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1078
messages to mess up the prompt */
1079
ret = klogctl(8, NULL, 5);
1080
bool restore_loglevel = true;
1081
if(ret == -1){
1082
restore_loglevel = false;
1083
perror("klogctl");
1084
}
1085
#endif /* __linux__ */
1086
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1088
if(sd < 0){
1089
perror("socket");
1090
exitcode = EXIT_FAILURE;
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
goto end;
1100
}
1101
strcpy(network.ifr_name, interface);
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1103
if(ret == -1){
1104
perror("ioctl SIOCGIFFLAGS");
1105
#ifdef __linux__
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1108
if(ret == -1){
1109
perror("klogctl");
1110
}
1111
}
1112
#endif /* __linux__ */
1113
exitcode = EXIT_FAILURE;
1114
goto end;
1115
}
1116
if((network.ifr_flags & IFF_UP) == 0){
1117
network.ifr_flags |= IFF_UP;
1118
take_down_interface = true;
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1120
if(ret == -1){
1121
take_down_interface = false;
1122
perror("ioctl SIOCSIFFLAGS");
1123
exitcode = EXIT_FAILURE;
1124
#ifdef __linux__
1125
if(restore_loglevel){
1126
ret = klogctl(7, NULL, 0);
1127
if(ret == -1){
1128
perror("klogctl");
1129
}
1130
}
1131
#endif /* __linux__ */
1132
goto end;
1133
}
1134
}
1135
/* sleep checking until interface is running */
1136
for(int i=0; i < delay * 4; i++){
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1138
if(ret == -1){
1139
perror("ioctl SIOCGIFFLAGS");
1140
} else if(network.ifr_flags & IFF_RUNNING){
1141
break;
1142
}
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1144
ret = nanosleep(&sleeptime, NULL);
1145
if(ret == -1 and errno != EINTR){
1146
perror("nanosleep");
1147
}
1148
}
1149
if(not take_down_interface){
1150
/* We won't need the socket anymore */
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1152
if(ret == -1){
1153
perror("close");
1154
}
1155
}
1156
#ifdef __linux__
1157
if(restore_loglevel){
1158
/* Restores kernel loglevel to default */
1159
ret = klogctl(7, NULL, 0);
1160
if(ret == -1){
1161
perror("klogctl");
1162
}
1163
}
1164
#endif /* __linux__ */
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
uid = getuid();
1172
gid = getgid();
1173
1174
errno = 0;
1175
setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
ret = setuid(uid);
1181
if(ret == -1){
1182
perror("setuid");
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
ret = init_gnutls_global(pubkey, seckey);
1190
if(ret == -1){
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
1193
goto end;
1194
} else {
1195
gnutls_initialized = true;
1196
}
1197
1198
if(quit_now){
1199
goto end;
1200
}
1201
1202
tempdir_created = true;
1203
if(mkdtemp(tempdir) == NULL){
1204
tempdir_created = false;
1205
perror("mkdtemp");
1206
goto end;
1207
}
1208
1209
if(quit_now){
1210
goto end;
1211
}
1212
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
1216
goto end;
1217
} else {
1218
gpgme_initialized = true;
1219
}
1220
1221
if(quit_now){
1222
goto end;
1223
}
1224
1225
if(connect_to != NULL){
1226
/* Connect directly, do not use Zeroconf */
1227
/* (Mainly meant for debugging) */
1228
char *address = strrchr(connect_to, ':');
1229
if(address == NULL){
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
1232
goto end;
1233
}
1234
1235
if(quit_now){
1236
goto end;
1237
}
1238
1239
uint16_t port;
1240
errno = 0;
1241
tmpmax = strtoimax(address+1, &tmp, 10);
1242
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1243
or tmpmax != (uint16_t)tmpmax){
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
1246
goto end;
1247
}
1248
1249
if(quit_now){
1250
goto end;
1251
}
1252
1253
port = (uint16_t)tmpmax;
1254
*address = '\0';
1255
address = connect_to;
1256
/* Colon in address indicates IPv6 */
1257
int af;
1258
if(strchr(address, ':') != NULL){
1259
af = AF_INET6;
1260
} else {
1261
af = AF_INET;
1262
}
1263
1264
if(quit_now){
1265
goto end;
1266
}
1267
1268
ret = start_mandos_communication(address, port, if_index, af);
1269
if(ret < 0){
1270
exitcode = EXIT_FAILURE;
1271
} else {
1272
exitcode = EXIT_SUCCESS;
1273
}
1274
goto end;
1275
}
1276
1277
if(quit_now){
1278
goto end;
1279
}
1280
1281
{
1282
AvahiServerConfig config;
1283
/* Do not publish any local Zeroconf records */
1284
avahi_server_config_init(&config);
1285
config.publish_hinfo = 0;
1286
config.publish_addresses = 0;
1287
config.publish_workstation = 0;
1288
config.publish_domain = 0;
1289
1290
/* Allocate a new server */
1291
mc.server = avahi_server_new(avahi_simple_poll_get
1292
(mc.simple_poll), &config, NULL,
1293
NULL, &error);
1294
1295
/* Free the Avahi configuration data */
1296
avahi_server_config_free(&config);
1297
}
1298
1299
/* Check if creating the Avahi server object succeeded */
1300
if(mc.server == NULL){
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
1302
avahi_strerror(error));
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Create the Avahi service browser */
1312
sb = avahi_s_service_browser_new(mc.server, if_index,
1313
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1314
NULL, 0, browse_callback, NULL);
1315
if(sb == NULL){
1316
fprintf(stderr, "Failed to create service browser: %s\n",
1317
avahi_strerror(avahi_server_errno(mc.server)));
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
/* Run the main loop */
1327
1328
if(debug){
1329
fprintf(stderr, "Starting Avahi loop search\n");
1330
}
1331
1332
avahi_simple_poll_loop(mc.simple_poll);
1333
991
exit(EXIT_FAILURE);
992
}
993
994
if(connect_to != NULL){
995
/* Connect directly, do not use Zeroconf */
996
/* (Mainly meant for debugging) */
997
char *address = strrchr(connect_to, ':');
998
if(address == NULL){
999
fprintf(stderr, "No colon in address\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
errno = 0;
1004
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1005
if(errno){
1006
perror("Bad port number");
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
*address = '\0';
1011
address = connect_to;
1012
ret = start_mandos_communication(address, port, if_index, &mc);
1013
if(ret < 0){
1014
exitcode = EXIT_FAILURE;
1015
} else {
1016
exitcode = EXIT_SUCCESS;
1017
}
1018
goto end;
1019
}
1020
1021
if (not debug){
1022
avahi_set_log_function(empty_log);
1023
}
1024
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
1028
/* Allocate main Avahi loop object */
1029
mc.simple_poll = avahi_simple_poll_new();
1030
if (mc.simple_poll == NULL) {
1031
fprintf(stderr, "Avahi: Failed to create simple poll"
1032
" object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
{
1038
AvahiServerConfig config;
1039
/* Do not publish any local Zeroconf records */
1040
avahi_server_config_init(&config);
1041
config.publish_hinfo = 0;
1042
config.publish_addresses = 0;
1043
config.publish_workstation = 0;
1044
config.publish_domain = 0;
1045
1046
/* Allocate a new server */
1047
mc.server = avahi_server_new(avahi_simple_poll_get
1048
(mc.simple_poll), &config, NULL,
1049
NULL, &error);
1050
1051
/* Free the Avahi configuration data */
1052
avahi_server_config_free(&config);
1053
}
1054
1055
/* Check if creating the Avahi server object succeeded */
1056
if (mc.server == NULL) {
1057
fprintf(stderr, "Failed to create Avahi server: %s\n",
1058
avahi_strerror(error));
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* Create the Avahi service browser */
1064
sb = avahi_s_service_browser_new(mc.server, if_index,
1065
AVAHI_PROTO_INET6,
1066
"_mandos._tcp", NULL, 0,
1067
browse_callback, &mc);
1068
if (sb == NULL) {
1069
fprintf(stderr, "Failed to create service browser: %s\n",
1070
avahi_strerror(avahi_server_errno(mc.server)));
1071
exitcode = EXIT_FAILURE;
1072
goto end;
1073
}
1074
1075
/* Run the main loop */
1076
1077
if (debug){
1078
fprintf(stderr, "Starting Avahi loop search\n");
1079
}
1080
1081
avahi_simple_poll_loop(mc.simple_poll);
1082
1334
1083
end:
1335
1336
if(debug){
1337
fprintf(stderr, "%s exiting\n", argv[0]);
1338
}
1339
1340
/* Cleanup things */
1341
if(sb != NULL)
1342
avahi_s_service_browser_free(sb);
1343
1344
if(mc.server != NULL)
1345
avahi_server_free(mc.server);
1346
1347
if(mc.simple_poll != NULL)
1348
avahi_simple_poll_free(mc.simple_poll);
1349
1350
if(gnutls_initialized){
1351
gnutls_certificate_free_credentials(mc.cred);
1352
gnutls_global_deinit();
1353
gnutls_dh_params_deinit(mc.dh_params);
1354
}
1355
1356
if(gpgme_initialized){
1357
gpgme_release(mc.ctx);
1358
}
1359
1360
/* Take down the network interface */
1361
if(take_down_interface){
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1363
if(ret == -1){
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1368
if(ret == -1){
1369
perror("ioctl SIOCSIFFLAGS");
1370
}
1371
}
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1373
if(ret == -1){
1374
perror("close");
1375
}
1376
}
1377
1378
/* Removes the temp directory used by GPGME */
1379
if(tempdir_created){
1380
DIR *d;
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1383
if(d == NULL){
1384
if(errno != ENOENT){
1084
1085
if (debug){
1086
fprintf(stderr, "%s exiting\n", argv[0]);
1087
}
1088
1089
/* Cleanup things */
1090
if (sb != NULL)
1091
avahi_s_service_browser_free(sb);
1092
1093
if (mc.server != NULL)
1094
avahi_server_free(mc.server);
1095
1096
if (mc.simple_poll != NULL)
1097
avahi_simple_poll_free(mc.simple_poll);
1098
1099
if (gnutls_initalized){
1100
gnutls_certificate_free_credentials(mc.cred);
1101
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1103
}
1104
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1107
}
1108
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1111
DIR *d;
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1114
if(d == NULL){
1385
1115
perror("opendir");
1386
}
1387
} else {
1388
while(true){
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1391
break;
1392
}
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1398
continue;
1399
}
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
1402
direntry->d_name);
1403
if(ret < 0){
1404
perror("asprintf");
1405
continue;
1406
}
1407
ret = remove(fullname);
1408
if(ret == -1){
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1410
strerror(errno));
1411
}
1412
free(fullname);
1413
}
1414
closedir(d);
1415
}
1416
ret = rmdir(tempdir);
1417
if(ret == -1 and errno != ENOENT){
1418
perror("rmdir");
1419
}
1420
}
1421
1422
return exitcode;
1116
} else {
1117
while(true){
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1120
break;
1121
}
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1125
direntry->d_name);
1126
if(ret < 0){
1127
perror("asprintf");
1128
continue;
1129
}
1130
ret = unlink(fullname);
1131
if(ret == -1){
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1134
}
1135
free(fullname);
1136
}
1137
}
1138
closedir(d);
1139
}
1140
ret = rmdir(tempdir);
1141
if(ret == -1){
1142
perror("rmdir");
1143
}
1144
}
1145
1146
return exitcode;
1423
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0