To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/trunk
« back to all changes in this revision
Viewing changes to plugins.d/mandos-client.c
- browse files at revision 191
- compare with another revision
- download diff
- download tarball
- view history from revision 191
- Committer: Teddy Hogeborn
- Date: 2008-09-19 13:50:22 UTC
- Revision ID: teddy@fukt.bsnet.se-20080919135022-214t21hetv8jgv0y
* debian/mandos-client.docs: New. Add README and TODO file.
* debian/mandos.docs: - '' -
* debian/mandos-client.links: New. Create plugin-runner.conf(5) link.
* debian/rules (DH_VERBOSE): Commented out.
Removed commented-out unused dh_* stuff. Removed
"dh_makeshlibs".
* debian/mandos.docs: - '' -
* debian/mandos-client.links: New. Create plugin-runner.conf(5) link.
* debian/rules (DH_VERBOSE): Commented out.
Removed commented-out unused dh_* stuff. Removed
"dh_makeshlibs".
- files added:
- etc-plugins.d-README
- 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
getuid(), getgid(), seteuid(),
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, sig_atomic_t,
84
raise() */
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){
150
int ret;
167
151
gpgme_error_t rc;
168
152
gpgme_engine_info_t engine_info;
169
153
170
154
171
155
/*
172
* Helper function to insert pub and seckey to the engine keyring.
156
* Helper function to insert pub and seckey to the enigne keyring.
173
157
*/
174
158
bool import_key(const char *filename){
175
int ret;
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
252
return true;
235
return true;
253
236
}
254
237
255
238
/*
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
do {
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
if(ret != GNUTLS_E_SUCCESS){
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
481
464
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
465
safer_gnutls_strerror(ret));
483
466
}
484
467
485
468
{
486
469
const char *err;
487
do {
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
491
472
fprintf(stderr, "Syntax error at: %s\n", err);
492
473
fprintf(stderr, "GnuTLS error: %s\n",
493
474
safer_gnutls_strerror(ret));
494
gnutls_deinit(*session);
475
gnutls_deinit (*session);
495
476
return -1;
496
477
}
497
478
}
498
479
499
do {
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
501
mc.cred);
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
if(ret != GNUTLS_E_SUCCESS){
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
504
483
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
505
484
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
485
gnutls_deinit (*session);
507
486
return -1;
508
487
}
509
488
510
489
/* ignore client certificate if any. */
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
512
492
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
514
494
515
495
return 0;
516
496
}
519
499
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
520
500
__attribute__((unused)) const char *txt){}
521
501
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
524
525
502
/* Called when a Mandos server is found */
526
503
static int start_mandos_communication(const char *ip, uint16_t port,
527
504
AvahiIfIndex if_index,
528
int af){
529
int ret, tcp_sd = -1;
530
ssize_t sret;
531
union {
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
534
} to;
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
535
508
char *buffer = NULL;
536
509
char *decrypted_buffer;
537
510
size_t buffer_length = 0;
538
511
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
539
513
size_t written;
540
514
int retval = 0;
515
char interface[IF_NAMESIZE];
541
516
gnutls_session_t session;
542
int pf; /* Protocol family */
543
544
if(quit_now){
545
return -1;
546
}
547
548
switch(af){
549
case AF_INET6:
550
pf = PF_INET6;
551
break;
552
case AF_INET:
553
pf = PF_INET;
554
break;
555
default:
556
fprintf(stderr, "Bad address family: %d\n", af);
557
return -1;
558
}
559
560
ret = init_gnutls_session(&session);
561
if(ret != 0){
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
562
520
return -1;
563
521
}
564
522
565
523
if(debug){
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
567
525
"\n", ip, port);
568
526
}
569
527
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
571
if(tcp_sd < 0){
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
572
530
perror("socket");
573
retval = -1;
574
goto mandos_end;
531
return -1;
575
532
}
576
533
577
if(quit_now){
578
goto mandos_end;
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);
579
540
}
580
541
581
542
memset(&to, 0, sizeof(to));
582
if(af == AF_INET6){
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
585
} else { /* IPv4 */
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
588
}
589
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 ){
590
548
perror("inet_pton");
591
retval = -1;
592
goto mandos_end;
549
return -1;
593
550
}
594
551
if(ret == 0){
595
552
fprintf(stderr, "Bad address: %s\n", ip);
596
retval = -1;
597
goto mandos_end;
598
}
599
if(af == AF_INET6){
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
606
-Wunreachable-code*/
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
610
retval = -1;
611
goto mandos_end;
612
}
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
615
}
616
} else {
617
to.in.sin_port = htons(port); /* Spurious warnings from
618
-Wconversion and
619
-Wunreachable-code */
620
}
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
621
556
622
if(quit_now){
623
goto mandos_end;
624
}
557
to.in6.sin6_scope_id = (uint32_t)if_index;
625
558
626
559
if(debug){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
631
} else {
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
634
}
635
} else {
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
637
port);
638
}
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
641
const char *pcret;
642
if(af == AF_INET6){
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
644
sizeof(addrstr));
645
} else {
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
sizeof(addrstr));
648
}
649
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){
650
565
perror("inet_ntop");
651
566
} else {
652
567
if(strcmp(addrstr, ip) != 0){
655
570
}
656
571
}
657
572
658
if(quit_now){
659
goto mandos_end;
660
}
661
662
if(af == AF_INET6){
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
664
} else {
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
666
}
667
if(ret < 0){
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
668
575
perror("connect");
669
retval = -1;
670
goto mandos_end;
671
}
672
673
if(quit_now){
674
goto mandos_end;
576
return -1;
675
577
}
676
578
677
579
const char *out = mandos_protocol_version;
678
580
written = 0;
679
while(true){
581
while (true){
680
582
size_t out_size = strlen(out);
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
682
584
out_size - written));
683
if(ret == -1){
585
if (ret == -1){
684
586
perror("write");
685
587
retval = -1;
686
588
goto mandos_end;
689
591
if(written < out_size){
690
592
continue;
691
593
} else {
692
if(out == mandos_protocol_version){
594
if (out == mandos_protocol_version){
693
595
written = 0;
694
596
out = "\r\n";
695
597
} else {
696
598
break;
697
599
}
698
600
}
699
700
if(quit_now){
701
goto mandos_end;
702
}
703
601
}
704
602
705
603
if(debug){
706
604
fprintf(stderr, "Establishing TLS session with %s\n", ip);
707
605
}
708
606
709
if(quit_now){
710
goto mandos_end;
711
}
712
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
714
715
if(quit_now){
716
goto mandos_end;
717
}
718
719
do {
720
ret = gnutls_handshake(session);
721
if(quit_now){
722
goto mandos_end;
723
}
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
724
611
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
725
612
726
if(ret != GNUTLS_E_SUCCESS){
613
if (ret != GNUTLS_E_SUCCESS){
727
614
if(debug){
728
615
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
729
gnutls_perror(ret);
616
gnutls_perror (ret);
730
617
}
731
618
retval = -1;
732
619
goto mandos_end;
735
622
/* Read OpenPGP packet that contains the wanted password */
736
623
737
624
if(debug){
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
739
626
ip);
740
627
}
741
628
742
629
while(true){
743
744
if(quit_now){
745
goto mandos_end;
746
}
747
748
buffer_capacity = incbuffer(&buffer, buffer_length,
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
749
631
buffer_capacity);
750
if(buffer_capacity == 0){
751
perror("incbuffer");
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
752
634
retval = -1;
753
635
goto mandos_end;
754
636
}
755
637
756
if(quit_now){
757
goto mandos_end;
758
}
759
760
sret = gnutls_record_recv(session, buffer+buffer_length,
761
BUFFER_SIZE);
762
if(sret == 0){
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
763
641
break;
764
642
}
765
if(sret < 0){
766
switch(sret){
643
if (ret < 0){
644
switch(ret){
767
645
case GNUTLS_E_INTERRUPTED:
768
646
case GNUTLS_E_AGAIN:
769
647
break;
770
648
case GNUTLS_E_REHANDSHAKE:
771
do {
772
ret = gnutls_handshake(session);
773
774
if(quit_now){
775
goto mandos_end;
776
}
649
do{
650
ret = gnutls_handshake (session);
777
651
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
778
if(ret < 0){
652
if (ret < 0){
779
653
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
780
gnutls_perror(ret);
654
gnutls_perror (ret);
781
655
retval = -1;
782
656
goto mandos_end;
783
657
}
786
660
fprintf(stderr, "Unknown error while reading data from"
787
661
" encrypted session with Mandos server\n");
788
662
retval = -1;
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
790
664
goto mandos_end;
791
665
}
792
666
} else {
793
buffer_length += (size_t) sret;
667
buffer_length += (size_t) ret;
794
668
}
795
669
}
796
670
798
672
fprintf(stderr, "Closing TLS session\n");
799
673
}
800
674
801
if(quit_now){
802
goto mandos_end;
803
}
804
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
806
807
if(quit_now){
808
goto mandos_end;
809
}
810
811
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
814
679
buffer_length,
815
680
&decrypted_buffer);
816
if(decrypted_buffer_size >= 0){
817
681
if (decrypted_buffer_size >= 0){
818
682
written = 0;
819
683
while(written < (size_t) decrypted_buffer_size){
820
if(quit_now){
821
goto mandos_end;
822
}
823
824
ret = (int)fwrite(decrypted_buffer + written, 1,
825
(size_t)decrypted_buffer_size - written,
826
stdout);
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
827
687
if(ret == 0 and ferror(stdout)){
828
688
if(debug){
829
689
fprintf(stderr, "Error writing encrypted data: %s\n",
846
706
847
707
mandos_end:
848
708
free(buffer);
849
if(tcp_sd >= 0){
850
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
851
}
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
852
710
if(ret == -1){
853
711
perror("close");
854
712
}
855
gnutls_deinit(session);
856
if(quit_now){
857
retval = -1;
858
}
713
gnutls_deinit (session);
859
714
return retval;
860
715
}
861
716
862
717
static void resolve_callback(AvahiSServiceResolver *r,
863
718
AvahiIfIndex interface,
864
AvahiProtocol proto,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
865
720
AvahiResolverEvent event,
866
721
const char *name,
867
722
const char *type,
872
727
AVAHI_GCC_UNUSED AvahiStringList *txt,
873
728
AVAHI_GCC_UNUSED AvahiLookupResultFlags
874
729
flags,
875
AVAHI_GCC_UNUSED void* userdata){
730
void* userdata) {
731
mandos_context *mc = userdata;
876
732
assert(r);
877
733
878
734
/* Called whenever a service has been resolved successfully or
879
735
timed out */
880
736
881
if(quit_now){
882
return;
883
}
884
885
switch(event){
737
switch (event) {
886
738
default:
887
739
case AVAHI_RESOLVER_FAILURE:
888
740
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
889
741
" of type '%s' in domain '%s': %s\n", name, type, domain,
890
avahi_strerror(avahi_server_errno(mc.server)));
742
avahi_strerror(avahi_server_errno(mc->server)));
891
743
break;
892
744
893
745
case AVAHI_RESOLVER_FOUND:
896
748
avahi_address_snprint(ip, sizeof(ip), address);
897
749
if(debug){
898
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
899
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
900
ip, (intmax_t)interface, port);
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
901
753
}
902
int ret = start_mandos_communication(ip, port, interface,
903
avahi_proto_to_af(proto));
904
if(ret == 0){
905
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);
906
757
}
907
758
}
908
759
}
909
760
avahi_s_service_resolver_free(r);
910
761
}
911
762
912
static void browse_callback(AvahiSServiceBrowser *b,
913
AvahiIfIndex interface,
914
AvahiProtocol protocol,
915
AvahiBrowserEvent event,
916
const char *name,
917
const char *type,
918
const char *domain,
919
AVAHI_GCC_UNUSED AvahiLookupResultFlags
920
flags,
921
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;
922
774
assert(b);
923
775
924
776
/* Called whenever a new services becomes available on the LAN or
925
777
is removed from the LAN */
926
778
927
if(quit_now){
928
return;
929
}
930
931
switch(event){
779
switch (event) {
932
780
default:
933
781
case AVAHI_BROWSER_FAILURE:
934
782
935
783
fprintf(stderr, "(Avahi browser) %s\n",
936
avahi_strerror(avahi_server_errno(mc.server)));
937
avahi_simple_poll_quit(mc.simple_poll);
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
938
786
return;
939
787
940
788
case AVAHI_BROWSER_NEW:
943
791
the callback function is called the Avahi server will free the
944
792
resolver for us. */
945
793
946
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
947
name, type, domain, protocol, 0,
948
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)))
949
798
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
950
name, avahi_strerror(avahi_server_errno(mc.server)));
799
name, avahi_strerror(avahi_server_errno(mc->server)));
951
800
break;
952
801
953
802
case AVAHI_BROWSER_REMOVE:
962
811
}
963
812
}
964
813
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
967
if(quit_now){
968
return;
969
}
970
quit_now = 1;
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
975
}
976
errno = old_errno;
977
}
978
979
814
int main(int argc, char *argv[]){
980
AvahiSServiceBrowser *sb = NULL;
981
int error;
982
int ret;
983
intmax_t tmpmax;
984
char *tmp;
985
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
988
int sd = -1;
989
bool take_down_interface = false;
990
uid_t uid;
991
gid_t gid;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
const char *seckey = PATHDIR "/" SECKEY;
997
const char *pubkey = PATHDIR "/" PUBKEY;
998
999
bool gnutls_initialized = false;
1000
bool gpgme_initialized = false;
1001
float delay = 2.5f;
1002
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1005
1006
uid = getuid();
1007
gid = getgid();
1008
1009
/* Lower any group privileges we might have, just to be safe */
1010
errno = 0;
1011
ret = setgid(gid);
1012
if(ret == -1){
1013
perror("setgid");
1014
}
1015
1016
/* Lower user privileges (temporarily) */
1017
errno = 0;
1018
ret = seteuid(uid);
1019
if(ret == -1){
1020
perror("seteuid");
1021
}
1022
1023
if(quit_now){
1024
goto end;
1025
}
1026
1027
{
1028
struct argp_option options[] = {
1029
{ .name = "debug", .key = 128,
1030
.doc = "Debug mode", .group = 3 },
1031
{ .name = "connect", .key = 'c',
1032
.arg = "ADDRESS:PORT",
1033
.doc = "Connect directly to a specific Mandos server",
1034
.group = 1 },
1035
{ .name = "interface", .key = 'i',
1036
.arg = "NAME",
1037
.doc = "Network interface that will be used to search for"
1038
" Mandos servers",
1039
.group = 1 },
1040
{ .name = "seckey", .key = 's',
1041
.arg = "FILE",
1042
.doc = "OpenPGP secret key file base name",
1043
.group = 1 },
1044
{ .name = "pubkey", .key = 'p',
1045
.arg = "FILE",
1046
.doc = "OpenPGP public key file base name",
1047
.group = 2 },
1048
{ .name = "dh-bits", .key = 129,
1049
.arg = "BITS",
1050
.doc = "Bit length of the prime number used in the"
1051
" Diffie-Hellman key exchange",
1052
.group = 2 },
1053
{ .name = "priority", .key = 130,
1054
.arg = "STRING",
1055
.doc = "GnuTLS priority string for the TLS handshake",
1056
.group = 1 },
1057
{ .name = "delay", .key = 131,
1058
.arg = "SECONDS",
1059
.doc = "Maximum delay to wait for interface startup",
1060
.group = 2 },
1061
{ .name = NULL }
1062
};
1063
1064
error_t parse_opt(int key, char *arg,
1065
struct argp_state *state){
1066
switch(key){
1067
case 128: /* --debug */
1068
debug = true;
1069
break;
1070
case 'c': /* --connect */
1071
connect_to = arg;
1072
break;
1073
case 'i': /* --interface */
1074
interface = arg;
1075
break;
1076
case 's': /* --seckey */
1077
seckey = arg;
1078
break;
1079
case 'p': /* --pubkey */
1080
pubkey = arg;
1081
break;
1082
case 129: /* --dh-bits */
1083
errno = 0;
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1088
exit(EXIT_FAILURE);
1089
}
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1091
break;
1092
case 130: /* --priority */
1093
mc.priority = arg;
1094
break;
1095
case 131: /* --delay */
1096
errno = 0;
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1100
exit(EXIT_FAILURE);
1101
}
1102
break;
1103
case ARGP_KEY_ARG:
1104
argp_usage(state);
1105
case ARGP_KEY_END:
1106
break;
1107
default:
1108
return ARGP_ERR_UNKNOWN;
1109
}
1110
return 0;
1111
}
1112
1113
struct argp argp = { .options = options, .parser = parse_opt,
1114
.args_doc = "",
1115
.doc = "Mandos client -- Get and decrypt"
1116
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1121
goto end;
1122
}
1123
}
1124
1125
if(not debug){
1126
avahi_set_log_function(empty_log);
1127
}
1128
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1137
goto end;
1138
}
1139
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1142
if(ret == -1){
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1145
goto end;
1146
}
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1148
if(ret == -1){
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1151
goto end;
1152
}
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1154
if(ret == -1){
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1157
goto end;
1158
}
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1162
*/
1163
ret = sigaction(SIGINT, 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(SIGINT, &sigterm_action, NULL);
1170
if(ret == -1){
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1173
goto end;
1174
}
1175
}
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1177
if(ret == -1){
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1180
}
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1183
if(ret == -1){
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1186
goto end;
1187
}
1188
}
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1190
if(ret == -1){
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1193
}
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
1203
/* If the interface is down, bring it up */
1204
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
1205
988
if_index = (AvahiIfIndex) if_nametoindex(interface);
1206
989
if(if_index == 0){
1207
990
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1208
exitcode = EXIT_FAILURE;
1209
goto end;
1210
}
1211
1212
if(quit_now){
1213
goto end;
1214
}
1215
1216
/* Re-raise priviliges */
1217
errno = 0;
1218
ret = seteuid(0);
1219
if(ret == -1){
1220
perror("seteuid");
1221
}
1222
1223
#ifdef __linux__
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1228
if(ret == -1){
1229
restore_loglevel = false;
1230
perror("klogctl");
1231
}
1232
#endif /* __linux__ */
1233
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1235
if(sd < 0){
1236
perror("socket");
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__ */
1246
/* Lower privileges */
1247
errno = 0;
1248
ret = seteuid(uid);
1249
if(ret == -1){
1250
perror("seteuid");
1251
}
1252
goto end;
1253
}
1254
strcpy(network.ifr_name, interface);
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1256
if(ret == -1){
1257
perror("ioctl SIOCGIFFLAGS");
1258
#ifdef __linux__
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1261
if(ret == -1){
1262
perror("klogctl");
1263
}
1264
}
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
1268
errno = 0;
1269
ret = seteuid(uid);
1270
if(ret == -1){
1271
perror("seteuid");
1272
}
1273
goto end;
1274
}
1275
if((network.ifr_flags & IFF_UP) == 0){
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1279
if(ret == -1){
1280
take_down_interface = false;
1281
perror("ioctl SIOCSIFFLAGS");
1282
exitcode = EXIT_FAILURE;
1283
#ifdef __linux__
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1286
if(ret == -1){
1287
perror("klogctl");
1288
}
1289
}
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1292
errno = 0;
1293
ret = seteuid(uid);
1294
if(ret == -1){
1295
perror("seteuid");
1296
}
1297
goto end;
1298
}
1299
}
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1303
if(ret == -1){
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1306
break;
1307
}
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1312
}
1313
}
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1317
if(ret == -1){
1318
perror("close");
1319
}
1320
}
1321
#ifdef __linux__
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1325
if(ret == -1){
1326
perror("klogctl");
1327
}
1328
}
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1331
errno = 0;
1332
if(take_down_interface){
1333
/* Lower privileges */
1334
ret = seteuid(uid);
1335
if(ret == -1){
1336
perror("seteuid");
1337
}
1338
} else {
1339
/* Lower privileges permanently */
1340
ret = setuid(uid);
1341
if(ret == -1){
1342
perror("setuid");
1343
}
1344
}
1345
}
1346
1347
if(quit_now){
1348
goto end;
1349
}
1350
1351
ret = init_gnutls_global(pubkey, seckey);
1352
if(ret == -1){
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
1355
goto end;
1356
} else {
1357
gnutls_initialized = true;
1358
}
1359
1360
if(quit_now){
1361
goto end;
1362
}
1363
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1367
perror("mkdtemp");
1368
goto end;
1369
}
1370
1371
if(quit_now){
1372
goto end;
1373
}
1374
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
1378
goto end;
1379
} else {
1380
gpgme_initialized = true;
1381
}
1382
1383
if(quit_now){
1384
goto end;
1385
}
1386
1387
if(connect_to != NULL){
1388
/* Connect directly, do not use Zeroconf */
1389
/* (Mainly meant for debugging) */
1390
char *address = strrchr(connect_to, ':');
1391
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
uint16_t port;
1402
errno = 0;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
1408
goto end;
1409
}
1410
1411
if(quit_now){
1412
goto end;
1413
}
1414
1415
port = (uint16_t)tmpmax;
1416
*address = '\0';
1417
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1419
int af;
1420
if(strchr(address, ':') != NULL){
1421
af = AF_INET6;
1422
} else {
1423
af = AF_INET;
1424
}
1425
1426
if(quit_now){
1427
goto end;
1428
}
1429
1430
ret = start_mandos_communication(address, port, if_index, af);
1431
if(ret < 0){
1432
exitcode = EXIT_FAILURE;
1433
} else {
1434
exitcode = EXIT_SUCCESS;
1435
}
1436
goto end;
1437
}
1438
1439
if(quit_now){
1440
goto end;
1441
}
1442
1443
{
1444
AvahiServerConfig config;
1445
/* Do not publish any local Zeroconf records */
1446
avahi_server_config_init(&config);
1447
config.publish_hinfo = 0;
1448
config.publish_addresses = 0;
1449
config.publish_workstation = 0;
1450
config.publish_domain = 0;
1451
1452
/* Allocate a new server */
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
1455
NULL, &error);
1456
1457
/* Free the Avahi configuration data */
1458
avahi_server_config_free(&config);
1459
}
1460
1461
/* Check if creating the Avahi server object succeeded */
1462
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
1466
goto end;
1467
}
1468
1469
if(quit_now){
1470
goto end;
1471
}
1472
1473
/* Create the Avahi service browser */
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1477
if(sb == NULL){
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
1481
goto end;
1482
}
1483
1484
if(quit_now){
1485
goto end;
1486
}
1487
1488
/* Run the main loop */
1489
1490
if(debug){
1491
fprintf(stderr, "Starting Avahi loop search\n");
1492
}
1493
1494
avahi_simple_poll_loop(mc.simple_poll);
1495
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
1496
1083
end:
1497
1498
if(debug){
1499
fprintf(stderr, "%s exiting\n", argv[0]);
1500
}
1501
1502
/* Cleanup things */
1503
if(sb != NULL)
1504
avahi_s_service_browser_free(sb);
1505
1506
if(mc.server != NULL)
1507
avahi_server_free(mc.server);
1508
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
1511
1512
if(gnutls_initialized){
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
1515
gnutls_dh_params_deinit(mc.dh_params);
1516
}
1517
1518
if(gpgme_initialized){
1519
gpgme_release(mc.ctx);
1520
}
1521
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1525
errno = 0;
1526
ret = seteuid(0);
1527
if(ret == -1){
1528
perror("seteuid");
1529
}
1530
if(geteuid() == 0){
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1532
if(ret == -1){
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1537
if(ret == -1){
1538
perror("ioctl SIOCSIFFLAGS");
1539
}
1540
}
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1542
if(ret == -1){
1543
perror("close");
1544
}
1545
/* Lower privileges permanently */
1546
errno = 0;
1547
ret = setuid(uid);
1548
if(ret == -1){
1549
perror("setuid");
1550
}
1551
}
1552
}
1553
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1556
DIR *d;
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1559
if(d == NULL){
1560
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){
1561
1115
perror("opendir");
1562
}
1563
} else {
1564
while(true){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1567
break;
1568
}
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1574
continue;
1575
}
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1578
direntry->d_name);
1579
if(ret < 0){
1580
perror("asprintf");
1581
continue;
1582
}
1583
ret = remove(fullname);
1584
if(ret == -1){
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1586
strerror(errno));
1587
}
1588
free(fullname);
1589
}
1590
closedir(d);
1591
}
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1594
perror("rmdir");
1595
}
1596
}
1597
1598
if(quit_now){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1602
if(ret == -1){
1603
perror("sigaction");
1604
}
1605
raise(signal_received);
1606
}
1607
1608
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;
1609
1147
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0