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237.2.130
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-10 06:28:14 UTC
- mto: (24.1.142 mandos) (237.12.2 mandos-persistent) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 264.
- Revision ID: teddy@fukt.bsnet.se-20090910062814-wkkngiwm0xhxwlm2
* init.d-mandos: Bug fix: Correct the LSB header.
* mandos.xml (CHECKING): Add text about client disabling requiring
manual intervention to reverse.
* plugin-runner.c: Cast return value of TEMP_FAILURE_RETRY to "int"
where necessary.
* mandos.xml (CHECKING): Add text about client disabling requiring
manual intervention to reverse.
* plugin-runner.c: Cast return value of TEMP_FAILURE_RETRY to "int"
where necessary.
- files added:
- debian/watch
- files removed:
- debian/mandos-client.config
- files renamed:
- mandos-list => mandos-ctl
- files modified:
- INSTALL
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
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
33
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
34
37
#define _FILE_OFFSET_BITS 64
38
#endif
35
39
36
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
41
38
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror() */
43
stdout, ferror(), remove() */
40
44
#include <stdint.h> /* uint16_t, uint32_t */
41
45
#include <stddef.h> /* NULL, size_t, ssize_t */
42
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
45
49
#include <string.h> /* memset(), strcmp(), strlen(),
46
50
strerror(), asprintf(), strcpy() */
47
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
48
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
53
sockaddr_in6, PF_INET6,
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
52
56
#include <sys/stat.h> /* open() */
53
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
55
connect() */
58
inet_pton(), connect() */
56
59
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
59
64
#include <assert.h> /* assert() */
60
65
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
62
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
68
SIOCSIFFLAGS, if_indextoname(),
64
69
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
66
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
68
75
setgid() */
69
76
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
71
78
#include <argp.h> /* struct argp_option, error_t, struct
72
79
argp_state, struct argp,
73
80
argp_parse(), ARGP_KEY_ARG,
74
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
75
89
76
90
/* Avahi */
77
91
/* All Avahi types, constants and functions
90
104
gnutls_*
91
105
init_gnutls_session(),
92
106
GNUTLS_* */
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
94
109
GNUTLS_OPENPGP_FMT_BASE64 */
95
110
96
111
/* GPGME */
122
137
gpgme_ctx_t ctx;
123
138
} mandos_context;
124
139
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
125
145
/*
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
128
148
* "buffer_length" is how much is already used.
129
149
*/
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
150
size_t incbuffer(char **buffer, size_t buffer_length,
131
151
size_t buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
133
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
134
if (buffer == NULL){
154
if(buffer == NULL){
135
155
return 0;
136
156
}
137
157
buffer_capacity += BUFFER_SIZE;
142
162
/*
143
163
* Initialize GPGME.
144
164
*/
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
165
static bool init_gpgme(const char *seckey,
146
166
const char *pubkey, const char *tempdir){
147
int ret;
148
167
gpgme_error_t rc;
149
168
gpgme_engine_info_t engine_info;
150
169
151
170
152
171
/*
153
* Helper function to insert pub and seckey to the enigne keyring.
172
* Helper function to insert pub and seckey to the engine keyring.
154
173
*/
155
174
bool import_key(const char *filename){
175
int ret;
156
176
int fd;
157
177
gpgme_data_t pgp_data;
158
178
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
160
180
if(fd == -1){
161
181
perror("open");
162
182
return false;
163
183
}
164
184
165
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
186
if(rc != GPG_ERR_NO_ERROR){
167
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
188
gpgme_strsource(rc), gpgme_strerror(rc));
169
189
return false;
170
190
}
171
191
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
174
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
195
gpgme_strsource(rc), gpgme_strerror(rc));
176
196
return false;
177
197
}
178
198
179
ret = TEMP_FAILURE_RETRY(close(fd));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
180
200
if(ret == -1){
181
201
perror("close");
182
202
}
184
204
return true;
185
205
}
186
206
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
189
209
}
190
210
191
211
/* Init GPGME */
192
212
gpgme_check_version(NULL);
193
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
194
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
195
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
216
gpgme_strsource(rc), gpgme_strerror(rc));
197
217
return false;
198
218
}
199
219
200
220
/* Set GPGME home directory for the OpenPGP engine only */
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
203
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
224
gpgme_strsource(rc), gpgme_strerror(rc));
205
225
return false;
218
238
}
219
239
220
240
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
223
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
244
gpgme_strsource(rc), gpgme_strerror(rc));
225
245
return false;
226
246
}
227
247
228
if (not import_key(pubkey) or not import_key(seckey)){
248
if(not import_key(pubkey) or not import_key(seckey)){
229
249
return false;
230
250
}
231
251
232
return true;
252
return true;
233
253
}
234
254
235
255
/*
236
256
* Decrypt OpenPGP data.
237
257
* Returns -1 on error
238
258
*/
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
243
262
gpgme_data_t dh_crypto, dh_plain;
244
263
gpgme_error_t rc;
245
264
ssize_t ret;
246
265
size_t plaintext_capacity = 0;
247
266
ssize_t plaintext_length = 0;
248
267
249
if (debug){
268
if(debug){
250
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
251
270
}
252
271
253
272
/* Create new GPGME data buffer from memory cryptotext */
254
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
255
274
0);
256
if (rc != GPG_ERR_NO_ERROR){
275
if(rc != GPG_ERR_NO_ERROR){
257
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
258
277
gpgme_strsource(rc), gpgme_strerror(rc));
259
278
return -1;
261
280
262
281
/* Create new empty GPGME data buffer for the plaintext */
263
282
rc = gpgme_data_new(&dh_plain);
264
if (rc != GPG_ERR_NO_ERROR){
283
if(rc != GPG_ERR_NO_ERROR){
265
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
266
285
gpgme_strsource(rc), gpgme_strerror(rc));
267
286
gpgme_data_release(dh_crypto);
270
289
271
290
/* Decrypt data from the cryptotext data buffer to the plaintext
272
291
data buffer */
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
275
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
295
gpgme_strsource(rc), gpgme_strerror(rc));
277
296
plaintext_length = -1;
278
if (debug){
297
if(debug){
279
298
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
282
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
283
302
} else {
284
303
fprintf(stderr, "Unsupported algorithm: %s\n",
290
309
}
291
310
gpgme_recipient_t recipient;
292
311
recipient = result->recipients;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
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;
303
320
}
304
321
}
305
322
}
311
328
}
312
329
313
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
315
332
perror("gpgme_data_seek");
316
333
plaintext_length = -1;
317
334
goto decrypt_end;
319
336
320
337
*plaintext = NULL;
321
338
while(true){
322
plaintext_capacity = adjustbuffer(plaintext,
339
plaintext_capacity = incbuffer(plaintext,
323
340
(size_t)plaintext_length,
324
341
plaintext_capacity);
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
327
344
plaintext_length = -1;
328
345
goto decrypt_end;
329
346
}
331
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
332
349
BUFFER_SIZE);
333
350
/* Print the data, if any */
334
if (ret == 0){
351
if(ret == 0){
335
352
/* EOF */
336
353
break;
337
354
}
361
378
return plaintext_length;
362
379
}
363
380
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
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
385
ret = "(unknown)";
368
386
return ret;
369
387
}
374
392
fprintf(stderr, "GnuTLS: %s", string);
375
393
}
376
394
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
395
static int init_gnutls_global(const char *pubkeyfilename,
379
396
const char *seckeyfilename){
380
397
int ret;
381
398
384
401
}
385
402
386
403
ret = gnutls_global_init();
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
390
407
return -1;
391
408
}
392
409
393
if (debug){
410
if(debug){
394
411
/* "Use a log level over 10 to enable all debugging options."
395
412
* - GnuTLS manual
396
413
*/
399
416
}
400
417
401
418
/* OpenPGP credentials */
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
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();
408
427
return -1;
409
428
}
410
429
415
434
}
416
435
417
436
ret = gnutls_certificate_set_openpgp_key_file
418
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
419
438
GNUTLS_OPENPGP_FMT_BASE64);
420
if (ret != GNUTLS_E_SUCCESS) {
439
if(ret != GNUTLS_E_SUCCESS){
421
440
fprintf(stderr,
422
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
423
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
446
}
428
447
429
448
/* GnuTLS server initialization */
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
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));
434
453
goto globalfail;
435
454
}
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
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));
440
459
goto globalfail;
441
460
}
442
461
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
444
463
445
464
return 0;
446
465
447
466
globalfail:
448
467
449
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
450
469
gnutls_global_deinit();
451
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
452
471
return -1;
453
472
}
454
473
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
474
static int init_gnutls_session(gnutls_session_t *session){
457
475
int ret;
458
476
/* GnuTLS session creation */
459
477
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
478
if(ret != GNUTLS_E_SUCCESS){
461
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
462
480
safer_gnutls_strerror(ret));
463
481
}
464
482
465
483
{
466
484
const char *err;
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
469
487
fprintf(stderr, "Syntax error at: %s\n", err);
470
488
fprintf(stderr, "GnuTLS error: %s\n",
471
489
safer_gnutls_strerror(ret));
472
gnutls_deinit (*session);
490
gnutls_deinit(*session);
473
491
return -1;
474
492
}
475
493
}
476
494
477
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
480
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
481
499
safer_gnutls_strerror(ret));
482
gnutls_deinit (*session);
500
gnutls_deinit(*session);
483
501
return -1;
484
502
}
485
503
486
504
/* ignore client certificate if any. */
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
489
507
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
491
509
492
510
return 0;
493
511
}
496
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
497
515
__attribute__((unused)) const char *txt){}
498
516
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
499
520
/* Called when a Mandos server is found */
500
521
static int start_mandos_communication(const char *ip, uint16_t port,
501
522
AvahiIfIndex if_index,
502
mandos_context *mc){
503
int ret, tcp_sd;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
523
int af){
524
int ret, tcp_sd = -1;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
505
530
char *buffer = NULL;
506
531
char *decrypted_buffer;
507
532
size_t buffer_length = 0;
508
533
size_t buffer_capacity = 0;
509
ssize_t decrypted_buffer_size;
510
534
size_t written;
511
535
int retval = 0;
512
char interface[IF_NAMESIZE];
513
536
gnutls_session_t session;
514
515
ret = init_gnutls_session (mc, &session);
516
if (ret != 0){
537
int pf; /* Protocol family */
538
539
if(quit_now){
540
return -1;
541
}
542
543
switch(af){
544
case AF_INET6:
545
pf = PF_INET6;
546
break;
547
case AF_INET:
548
pf = PF_INET;
549
break;
550
default:
551
fprintf(stderr, "Bad address family: %d\n", af);
552
return -1;
553
}
554
555
ret = init_gnutls_session(&session);
556
if(ret != 0){
517
557
return -1;
518
558
}
519
559
520
560
if(debug){
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
522
562
"\n", ip, port);
523
563
}
524
564
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
if(tcp_sd < 0) {
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
566
if(tcp_sd < 0){
527
567
perror("socket");
528
return -1;
568
retval = -1;
569
goto mandos_end;
529
570
}
530
571
531
if(debug){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
533
perror("if_indextoname");
534
return -1;
535
}
536
fprintf(stderr, "Binding to interface %s\n", interface);
572
if(quit_now){
573
goto mandos_end;
537
574
}
538
575
539
576
memset(&to, 0, sizeof(to));
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
544
if (ret < 0 ){
577
if(af == AF_INET6){
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
580
} else { /* IPv4 */
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
583
}
584
if(ret < 0 ){
545
585
perror("inet_pton");
546
return -1;
586
retval = -1;
587
goto mandos_end;
547
588
}
548
589
if(ret == 0){
549
590
fprintf(stderr, "Bad address: %s\n", ip);
550
return -1;
551
}
552
to.in6.sin6_port = htons(port); /* Spurious warning */
591
retval = -1;
592
goto mandos_end;
593
}
594
if(af == AF_INET6){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
596
-Wconversion and
597
-Wunreachable-code */
598
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
601
-Wunreachable-code*/
602
if(if_index == AVAHI_IF_UNSPEC){
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
605
retval = -1;
606
goto mandos_end;
607
}
608
/* Set the network interface number as scope */
609
to.in6.sin6_scope_id = (uint32_t)if_index;
610
}
611
} else {
612
to.in.sin_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
615
}
553
616
554
to.in6.sin6_scope_id = (uint32_t)if_index;
617
if(quit_now){
618
goto mandos_end;
619
}
555
620
556
621
if(debug){
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
623
char interface[IF_NAMESIZE];
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
625
perror("if_indextoname");
626
} else {
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
629
}
630
} else {
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
632
port);
633
}
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
636
const char *pcret;
637
if(af == AF_INET6){
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
639
sizeof(addrstr));
640
} else {
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
642
sizeof(addrstr));
643
}
644
if(pcret == NULL){
562
645
perror("inet_ntop");
563
646
} else {
564
647
if(strcmp(addrstr, ip) != 0){
567
650
}
568
651
}
569
652
570
ret = connect(tcp_sd, &to.in, sizeof(to));
571
if (ret < 0){
653
if(quit_now){
654
goto mandos_end;
655
}
656
657
if(af == AF_INET6){
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
659
} else {
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
661
}
662
if(ret < 0){
572
663
perror("connect");
573
return -1;
664
retval = -1;
665
goto mandos_end;
666
}
667
668
if(quit_now){
669
goto mandos_end;
574
670
}
575
671
576
672
const char *out = mandos_protocol_version;
577
673
written = 0;
578
while (true){
674
while(true){
579
675
size_t out_size = strlen(out);
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
676
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
581
677
out_size - written));
582
if (ret == -1){
678
if(ret == -1){
583
679
perror("write");
584
680
retval = -1;
585
681
goto mandos_end;
588
684
if(written < out_size){
589
685
continue;
590
686
} else {
591
if (out == mandos_protocol_version){
687
if(out == mandos_protocol_version){
592
688
written = 0;
593
689
out = "\r\n";
594
690
} else {
595
691
break;
596
692
}
597
693
}
694
695
if(quit_now){
696
goto mandos_end;
697
}
598
698
}
599
699
600
700
if(debug){
601
701
fprintf(stderr, "Establishing TLS session with %s\n", ip);
602
702
}
603
703
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
605
606
do{
607
ret = gnutls_handshake (session);
704
if(quit_now){
705
goto mandos_end;
706
}
707
708
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
709
710
if(quit_now){
711
goto mandos_end;
712
}
713
714
do {
715
ret = gnutls_handshake(session);
716
if(quit_now){
717
goto mandos_end;
718
}
608
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
609
720
610
if (ret != GNUTLS_E_SUCCESS){
721
if(ret != GNUTLS_E_SUCCESS){
611
722
if(debug){
612
723
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
613
gnutls_perror (ret);
724
gnutls_perror(ret);
614
725
}
615
726
retval = -1;
616
727
goto mandos_end;
619
730
/* Read OpenPGP packet that contains the wanted password */
620
731
621
732
if(debug){
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
733
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
623
734
ip);
624
735
}
625
736
626
737
while(true){
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
738
739
if(quit_now){
740
goto mandos_end;
741
}
742
743
buffer_capacity = incbuffer(&buffer, buffer_length,
628
744
buffer_capacity);
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
745
if(buffer_capacity == 0){
746
perror("incbuffer");
631
747
retval = -1;
632
748
goto mandos_end;
633
749
}
634
750
635
ret = gnutls_record_recv(session, buffer+buffer_length,
636
BUFFER_SIZE);
637
if (ret == 0){
751
if(quit_now){
752
goto mandos_end;
753
}
754
755
sret = gnutls_record_recv(session, buffer+buffer_length,
756
BUFFER_SIZE);
757
if(sret == 0){
638
758
break;
639
759
}
640
if (ret < 0){
641
switch(ret){
760
if(sret < 0){
761
switch(sret){
642
762
case GNUTLS_E_INTERRUPTED:
643
763
case GNUTLS_E_AGAIN:
644
764
break;
645
765
case GNUTLS_E_REHANDSHAKE:
646
do{
647
ret = gnutls_handshake (session);
766
do {
767
ret = gnutls_handshake(session);
768
769
if(quit_now){
770
goto mandos_end;
771
}
648
772
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
649
if (ret < 0){
773
if(ret < 0){
650
774
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
651
gnutls_perror (ret);
775
gnutls_perror(ret);
652
776
retval = -1;
653
777
goto mandos_end;
654
778
}
657
781
fprintf(stderr, "Unknown error while reading data from"
658
782
" encrypted session with Mandos server\n");
659
783
retval = -1;
660
gnutls_bye (session, GNUTLS_SHUT_RDWR);
784
gnutls_bye(session, GNUTLS_SHUT_RDWR);
661
785
goto mandos_end;
662
786
}
663
787
} else {
664
buffer_length += (size_t) ret;
788
buffer_length += (size_t) sret;
665
789
}
666
790
}
667
791
669
793
fprintf(stderr, "Closing TLS session\n");
670
794
}
671
795
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
673
674
if (buffer_length > 0){
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
796
if(quit_now){
797
goto mandos_end;
798
}
799
800
gnutls_bye(session, GNUTLS_SHUT_RDWR);
801
802
if(quit_now){
803
goto mandos_end;
804
}
805
806
if(buffer_length > 0){
807
ssize_t decrypted_buffer_size;
808
decrypted_buffer_size = pgp_packet_decrypt(buffer,
676
809
buffer_length,
677
810
&decrypted_buffer);
678
if (decrypted_buffer_size >= 0){
811
if(decrypted_buffer_size >= 0){
812
679
813
written = 0;
680
814
while(written < (size_t) decrypted_buffer_size){
681
ret = (int)fwrite (decrypted_buffer + written, 1,
682
(size_t)decrypted_buffer_size - written,
683
stdout);
815
if(quit_now){
816
goto mandos_end;
817
}
818
819
ret = (int)fwrite(decrypted_buffer + written, 1,
820
(size_t)decrypted_buffer_size - written,
821
stdout);
684
822
if(ret == 0 and ferror(stdout)){
685
823
if(debug){
686
824
fprintf(stderr, "Error writing encrypted data: %s\n",
703
841
704
842
mandos_end:
705
843
free(buffer);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
844
if(tcp_sd >= 0){
845
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
846
}
707
847
if(ret == -1){
708
848
perror("close");
709
849
}
710
gnutls_deinit (session);
850
gnutls_deinit(session);
851
if(quit_now){
852
retval = -1;
853
}
711
854
return retval;
712
855
}
713
856
714
857
static void resolve_callback(AvahiSServiceResolver *r,
715
858
AvahiIfIndex interface,
716
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
AvahiProtocol proto,
717
860
AvahiResolverEvent event,
718
861
const char *name,
719
862
const char *type,
724
867
AVAHI_GCC_UNUSED AvahiStringList *txt,
725
868
AVAHI_GCC_UNUSED AvahiLookupResultFlags
726
869
flags,
727
void* userdata) {
728
mandos_context *mc = userdata;
870
AVAHI_GCC_UNUSED void* userdata){
729
871
assert(r);
730
872
731
873
/* Called whenever a service has been resolved successfully or
732
874
timed out */
733
875
734
switch (event) {
876
if(quit_now){
877
return;
878
}
879
880
switch(event){
735
881
default:
736
882
case AVAHI_RESOLVER_FAILURE:
737
883
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
738
884
" of type '%s' in domain '%s': %s\n", name, type, domain,
739
avahi_strerror(avahi_server_errno(mc->server)));
885
avahi_strerror(avahi_server_errno(mc.server)));
740
886
break;
741
887
742
888
case AVAHI_RESOLVER_FOUND:
745
891
avahi_address_snprint(ip, sizeof(ip), address);
746
892
if(debug){
747
893
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
894
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
895
ip, (intmax_t)interface, port);
750
896
}
751
int ret = start_mandos_communication(ip, port, interface, mc);
752
if (ret == 0){
753
avahi_simple_poll_quit(mc->simple_poll);
897
int ret = start_mandos_communication(ip, port, interface,
898
avahi_proto_to_af(proto));
899
if(ret == 0){
900
avahi_simple_poll_quit(mc.simple_poll);
754
901
}
755
902
}
756
903
}
757
904
avahi_s_service_resolver_free(r);
758
905
}
759
906
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
764
const char *name,
765
const char *type,
766
const char *domain,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
768
flags,
769
void* userdata) {
770
mandos_context *mc = userdata;
907
static void browse_callback(AvahiSServiceBrowser *b,
908
AvahiIfIndex interface,
909
AvahiProtocol protocol,
910
AvahiBrowserEvent event,
911
const char *name,
912
const char *type,
913
const char *domain,
914
AVAHI_GCC_UNUSED AvahiLookupResultFlags
915
flags,
916
AVAHI_GCC_UNUSED void* userdata){
771
917
assert(b);
772
918
773
919
/* Called whenever a new services becomes available on the LAN or
774
920
is removed from the LAN */
775
921
776
switch (event) {
922
if(quit_now){
923
return;
924
}
925
926
switch(event){
777
927
default:
778
928
case AVAHI_BROWSER_FAILURE:
779
929
780
930
fprintf(stderr, "(Avahi browser) %s\n",
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
931
avahi_strerror(avahi_server_errno(mc.server)));
932
avahi_simple_poll_quit(mc.simple_poll);
783
933
return;
784
934
785
935
case AVAHI_BROWSER_NEW:
788
938
the callback function is called the Avahi server will free the
789
939
resolver for us. */
790
940
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
941
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
942
name, type, domain, protocol, 0,
943
resolve_callback, NULL) == NULL)
795
944
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
796
name, avahi_strerror(avahi_server_errno(mc->server)));
945
name, avahi_strerror(avahi_server_errno(mc.server)));
797
946
break;
798
947
799
948
case AVAHI_BROWSER_REMOVE:
808
957
}
809
958
}
810
959
960
/* stop main loop after sigterm has been called */
961
static void handle_sigterm(int sig){
962
if(quit_now){
963
return;
964
}
965
quit_now = 1;
966
signal_received = sig;
967
int old_errno = errno;
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
970
}
971
errno = old_errno;
972
}
973
811
974
int main(int argc, char *argv[]){
812
AvahiSServiceBrowser *sb = NULL;
813
int error;
814
int ret;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
818
int sd;
819
uid_t uid;
820
gid_t gid;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
832
833
{
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
887
errno = 0;
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
889
if (errno){
890
perror("strtol");
891
exit(EXIT_FAILURE);
892
}
893
break;
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
901
default:
902
return ARGP_ERR_UNKNOWN;
903
}
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
if(ret == -1){
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
944
if(ret == -1){
945
perror("close");
946
}
947
}
948
949
uid = getuid();
950
gid = getgid();
951
952
ret = setuid(uid);
953
if (ret == -1){
954
perror("setuid");
955
}
956
957
setgid(gid);
958
if (ret == -1){
959
perror("setgid");
960
}
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
975
AvahiSServiceBrowser *sb = NULL;
976
int error;
977
int ret;
978
intmax_t tmpmax;
979
char *tmp;
980
int exitcode = EXIT_SUCCESS;
981
const char *interface = "eth0";
982
struct ifreq network;
983
int sd = -1;
984
bool take_down_interface = false;
985
uid_t uid;
986
gid_t gid;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
991
const char *seckey = PATHDIR "/" SECKEY;
992
const char *pubkey = PATHDIR "/" PUBKEY;
993
994
bool gnutls_initialized = false;
995
bool gpgme_initialized = false;
996
float delay = 2.5f;
997
998
struct sigaction old_sigterm_action;
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1000
1001
{
1002
struct argp_option options[] = {
1003
{ .name = "debug", .key = 128,
1004
.doc = "Debug mode", .group = 3 },
1005
{ .name = "connect", .key = 'c',
1006
.arg = "ADDRESS:PORT",
1007
.doc = "Connect directly to a specific Mandos server",
1008
.group = 1 },
1009
{ .name = "interface", .key = 'i',
1010
.arg = "NAME",
1011
.doc = "Network interface that will be used to search for"
1012
" Mandos servers",
1013
.group = 1 },
1014
{ .name = "seckey", .key = 's',
1015
.arg = "FILE",
1016
.doc = "OpenPGP secret key file base name",
1017
.group = 1 },
1018
{ .name = "pubkey", .key = 'p',
1019
.arg = "FILE",
1020
.doc = "OpenPGP public key file base name",
1021
.group = 2 },
1022
{ .name = "dh-bits", .key = 129,
1023
.arg = "BITS",
1024
.doc = "Bit length of the prime number used in the"
1025
" Diffie-Hellman key exchange",
1026
.group = 2 },
1027
{ .name = "priority", .key = 130,
1028
.arg = "STRING",
1029
.doc = "GnuTLS priority string for the TLS handshake",
1030
.group = 1 },
1031
{ .name = "delay", .key = 131,
1032
.arg = "SECONDS",
1033
.doc = "Maximum delay to wait for interface startup",
1034
.group = 2 },
1035
{ .name = NULL }
1036
};
1037
1038
error_t parse_opt(int key, char *arg,
1039
struct argp_state *state){
1040
switch(key){
1041
case 128: /* --debug */
1042
debug = true;
1043
break;
1044
case 'c': /* --connect */
1045
connect_to = arg;
1046
break;
1047
case 'i': /* --interface */
1048
interface = arg;
1049
break;
1050
case 's': /* --seckey */
1051
seckey = arg;
1052
break;
1053
case 'p': /* --pubkey */
1054
pubkey = arg;
1055
break;
1056
case 129: /* --dh-bits */
1057
errno = 0;
1058
tmpmax = strtoimax(arg, &tmp, 10);
1059
if(errno != 0 or tmp == arg or *tmp != '\0'
1060
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1061
fprintf(stderr, "Bad number of DH bits\n");
1062
exit(EXIT_FAILURE);
1063
}
1064
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1065
break;
1066
case 130: /* --priority */
1067
mc.priority = arg;
1068
break;
1069
case 131: /* --delay */
1070
errno = 0;
1071
delay = strtof(arg, &tmp);
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
1073
fprintf(stderr, "Bad delay\n");
1074
exit(EXIT_FAILURE);
1075
}
1076
break;
1077
case ARGP_KEY_ARG:
1078
argp_usage(state);
1079
case ARGP_KEY_END:
1080
break;
1081
default:
1082
return ARGP_ERR_UNKNOWN;
1083
}
1084
return 0;
1085
}
1086
1087
struct argp argp = { .options = options, .parser = parse_opt,
1088
.args_doc = "",
1089
.doc = "Mandos client -- Get and decrypt"
1090
" passwords from a Mandos server" };
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
1095
goto end;
1096
}
1097
}
1098
1099
if(not debug){
1100
avahi_set_log_function(empty_log);
1101
}
1102
1103
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1104
from the signal handler */
1105
/* Initialize the pseudo-RNG for Avahi */
1106
srand((unsigned int) time(NULL));
1107
mc.simple_poll = avahi_simple_poll_new();
1108
if(mc.simple_poll == NULL){
1109
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
}
1113
1114
sigemptyset(&sigterm_action.sa_mask);
1115
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1116
if(ret == -1){
1117
perror("sigaddset");
1118
exitcode = EXIT_FAILURE;
1119
goto end;
1120
}
1121
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1122
if(ret == -1){
1123
perror("sigaddset");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
}
1127
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1128
if(ret == -1){
1129
perror("sigaddset");
1130
exitcode = EXIT_FAILURE;
1131
goto end;
1132
}
1133
/* Need to check if the handler is SIG_IGN before handling:
1134
| [[info:libc:Initial Signal Actions]] |
1135
| [[info:libc:Basic Signal Handling]] |
1136
*/
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1138
if(ret == -1){
1139
perror("sigaction");
1140
return EXIT_FAILURE;
1141
}
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
1144
if(ret == -1){
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1151
if(ret == -1){
1152
perror("sigaction");
1153
return EXIT_FAILURE;
1154
}
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1157
if(ret == -1){
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
1160
goto end;
1161
}
1162
}
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1164
if(ret == -1){
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1167
}
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
985
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
986
1180
if(if_index == 0){
987
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
988
exit(EXIT_FAILURE);
989
}
990
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
995
if(address == NULL){
996
fprintf(stderr, "No colon in address\n");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
1186
if(quit_now){
1187
goto end;
1188
}
1189
1190
#ifdef __linux__
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1195
if(ret == -1){
1196
restore_loglevel = false;
1197
perror("klogctl");
1198
}
1199
#endif /* __linux__ */
1200
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1202
if(sd < 0){
1203
perror("socket");
1204
exitcode = EXIT_FAILURE;
1205
#ifdef __linux__
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1208
if(ret == -1){
1209
perror("klogctl");
1210
}
1211
}
1212
#endif /* __linux__ */
1213
goto end;
1214
}
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1217
if(ret == -1){
1218
perror("ioctl SIOCGIFFLAGS");
1219
#ifdef __linux__
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1222
if(ret == -1){
1223
perror("klogctl");
1224
}
1225
}
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1228
goto end;
1229
}
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1234
if(ret == -1){
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
997
1237
exitcode = EXIT_FAILURE;
1238
#ifdef __linux__
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1241
if(ret == -1){
1242
perror("klogctl");
1243
}
1244
}
1245
#endif /* __linux__ */
998
1246
goto end;
999
1247
}
1248
}
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1252
if(ret == -1){
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
1255
break;
1256
}
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1261
}
1262
}
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1266
if(ret == -1){
1267
perror("close");
1268
}
1269
}
1270
#ifdef __linux__
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1274
if(ret == -1){
1275
perror("klogctl");
1276
}
1277
}
1278
#endif /* __linux__ */
1279
}
1280
1281
if(quit_now){
1282
goto end;
1283
}
1284
1285
uid = getuid();
1286
gid = getgid();
1287
1288
/* Drop any group privileges we might have, just to be safe */
1289
errno = 0;
1290
ret = setgid(gid);
1291
if(ret == -1){
1292
perror("setgid");
1293
}
1294
1295
/* Drop user privileges */
1296
errno = 0;
1297
/* Will we need privileges later? */
1298
if(take_down_interface){
1299
/* Drop user privileges temporarily */
1300
ret = seteuid(uid);
1301
if(ret == -1){
1302
perror("seteuid");
1303
}
1304
} else {
1305
/* Drop user privileges permanently */
1306
ret = setuid(uid);
1307
if(ret == -1){
1308
perror("setuid");
1309
}
1310
}
1311
1312
if(quit_now){
1313
goto end;
1314
}
1315
1316
ret = init_gnutls_global(pubkey, seckey);
1317
if(ret == -1){
1318
fprintf(stderr, "init_gnutls_global failed\n");
1319
exitcode = EXIT_FAILURE;
1320
goto end;
1321
} else {
1322
gnutls_initialized = true;
1323
}
1324
1325
if(quit_now){
1326
goto end;
1327
}
1328
1329
tempdir_created = true;
1330
if(mkdtemp(tempdir) == NULL){
1331
tempdir_created = false;
1332
perror("mkdtemp");
1333
goto end;
1334
}
1335
1336
if(quit_now){
1337
goto end;
1338
}
1339
1340
if(not init_gpgme(pubkey, seckey, tempdir)){
1341
fprintf(stderr, "init_gpgme failed\n");
1342
exitcode = EXIT_FAILURE;
1343
goto end;
1344
} else {
1345
gpgme_initialized = true;
1346
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
if(connect_to != NULL){
1353
/* Connect directly, do not use Zeroconf */
1354
/* (Mainly meant for debugging) */
1355
char *address = strrchr(connect_to, ':');
1356
if(address == NULL){
1357
fprintf(stderr, "No colon in address\n");
1358
exitcode = EXIT_FAILURE;
1359
goto end;
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
uint16_t port;
1367
errno = 0;
1368
tmpmax = strtoimax(address+1, &tmp, 10);
1369
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1370
or tmpmax != (uint16_t)tmpmax){
1371
fprintf(stderr, "Bad port number\n");
1372
exitcode = EXIT_FAILURE;
1373
goto end;
1374
}
1375
1376
if(quit_now){
1377
goto end;
1378
}
1379
1380
port = (uint16_t)tmpmax;
1381
*address = '\0';
1382
address = connect_to;
1383
/* Colon in address indicates IPv6 */
1384
int af;
1385
if(strchr(address, ':') != NULL){
1386
af = AF_INET6;
1387
} else {
1388
af = AF_INET;
1389
}
1390
1391
if(quit_now){
1392
goto end;
1393
}
1394
1395
ret = start_mandos_communication(address, port, if_index, af);
1396
if(ret < 0){
1397
exitcode = EXIT_FAILURE;
1398
} else {
1399
exitcode = EXIT_SUCCESS;
1400
}
1401
goto end;
1402
}
1403
1404
if(quit_now){
1405
goto end;
1406
}
1407
1408
{
1409
AvahiServerConfig config;
1410
/* Do not publish any local Zeroconf records */
1411
avahi_server_config_init(&config);
1412
config.publish_hinfo = 0;
1413
config.publish_addresses = 0;
1414
config.publish_workstation = 0;
1415
config.publish_domain = 0;
1416
1417
/* Allocate a new server */
1418
mc.server = avahi_server_new(avahi_simple_poll_get
1419
(mc.simple_poll), &config, NULL,
1420
NULL, &error);
1421
1422
/* Free the Avahi configuration data */
1423
avahi_server_config_free(&config);
1424
}
1425
1426
/* Check if creating the Avahi server object succeeded */
1427
if(mc.server == NULL){
1428
fprintf(stderr, "Failed to create Avahi server: %s\n",
1429
avahi_strerror(error));
1430
exitcode = EXIT_FAILURE;
1431
goto end;
1432
}
1433
1434
if(quit_now){
1435
goto end;
1436
}
1437
1438
/* Create the Avahi service browser */
1439
sb = avahi_s_service_browser_new(mc.server, if_index,
1440
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1441
NULL, 0, browse_callback, NULL);
1442
if(sb == NULL){
1443
fprintf(stderr, "Failed to create service browser: %s\n",
1444
avahi_strerror(avahi_server_errno(mc.server)));
1445
exitcode = EXIT_FAILURE;
1446
goto end;
1447
}
1448
1449
if(quit_now){
1450
goto end;
1451
}
1452
1453
/* Run the main loop */
1454
1455
if(debug){
1456
fprintf(stderr, "Starting Avahi loop search\n");
1457
}
1458
1459
avahi_simple_poll_loop(mc.simple_poll);
1460
1461
end:
1462
1463
if(debug){
1464
fprintf(stderr, "%s exiting\n", argv[0]);
1465
}
1466
1467
/* Cleanup things */
1468
if(sb != NULL)
1469
avahi_s_service_browser_free(sb);
1470
1471
if(mc.server != NULL)
1472
avahi_server_free(mc.server);
1473
1474
if(mc.simple_poll != NULL)
1475
avahi_simple_poll_free(mc.simple_poll);
1476
1477
if(gnutls_initialized){
1478
gnutls_certificate_free_credentials(mc.cred);
1479
gnutls_global_deinit();
1480
gnutls_dh_params_deinit(mc.dh_params);
1481
}
1482
1483
if(gpgme_initialized){
1484
gpgme_release(mc.ctx);
1485
}
1486
1487
/* Take down the network interface */
1488
if(take_down_interface){
1489
/* Re-raise priviliges */
1490
errno = 0;
1491
ret = seteuid(0);
1492
if(ret == -1){
1493
perror("seteuid");
1494
}
1495
if(geteuid() == 0){
1496
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1497
if(ret == -1){
1498
perror("ioctl SIOCGIFFLAGS");
1499
} else if(network.ifr_flags & IFF_UP) {
1500
network.ifr_flags &= ~IFF_UP; /* clear flag */
1501
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1502
if(ret == -1){
1503
perror("ioctl SIOCSIFFLAGS");
1504
}
1505
}
1506
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1507
if(ret == -1){
1508
perror("close");
1509
}
1510
/* Lower privileges, permanently this time */
1000
1511
errno = 0;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
if(errno){
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
*address = '\0';
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1010
if(ret < 0){
1011
exitcode = EXIT_FAILURE;
1012
} else {
1013
exitcode = EXIT_SUCCESS;
1014
}
1015
goto end;
1016
}
1017
1018
if (not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1024
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
" object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
{
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1042
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1046
NULL, &error);
1047
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1050
}
1051
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
AVAHI_PROTO_INET6,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1065
if (sb == NULL) {
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Run the main loop */
1073
1074
if (debug){
1075
fprintf(stderr, "Starting Avahi loop search\n");
1076
}
1077
1078
avahi_simple_poll_loop(mc.simple_poll);
1079
1080
end:
1081
1082
if (debug){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1084
}
1085
1086
/* Cleanup things */
1087
if (sb != NULL)
1088
avahi_s_service_browser_free(sb);
1089
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1092
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1512
ret = setuid(uid);
1513
if(ret == -1){
1514
perror("setuid");
1515
}
1516
}
1517
}
1518
1519
/* Removes the temp directory used by GPGME */
1520
if(tempdir_created){
1521
DIR *d;
1522
struct dirent *direntry;
1523
d = opendir(tempdir);
1524
if(d == NULL){
1525
if(errno != ENOENT){
1112
1526
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
1527
}
1528
} else {
1529
while(true){
1530
direntry = readdir(d);
1531
if(direntry == NULL){
1532
break;
1533
}
1534
/* Skip "." and ".." */
1535
if(direntry->d_name[0] == '.'
1536
and (direntry->d_name[1] == '\0'
1537
or (direntry->d_name[1] == '.'
1538
and direntry->d_name[2] == '\0'))){
1539
continue;
1540
}
1541
char *fullname = NULL;
1542
ret = asprintf(&fullname, "%s/%s", tempdir,
1543
direntry->d_name);
1544
if(ret < 0){
1545
perror("asprintf");
1546
continue;
1547
}
1548
ret = remove(fullname);
1549
if(ret == -1){
1550
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1551
strerror(errno));
1552
}
1553
free(fullname);
1554
}
1555
closedir(d);
1556
}
1557
ret = rmdir(tempdir);
1558
if(ret == -1 and errno != ENOENT){
1559
perror("rmdir");
1560
}
1561
}
1562
1563
if(quit_now){
1564
sigemptyset(&old_sigterm_action.sa_mask);
1565
old_sigterm_action.sa_handler = SIG_DFL;
1566
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1567
if(ret == -1){
1568
perror("sigaction");
1569
}
1570
raise(signal_received);
1571
}
1572
1573
return exitcode;
1144
1574
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0