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» Revision
237.2.134
(compared to revision 24.1.94)
: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-09-17 02:42:49 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-20090917024249-y6j76xtzz3i2vptv
* plugins.d/mandos-client.c (init_gnutls_session): Always fail and
return immediately
if interrupted by
signal.
return immediately
if interrupted by
signal.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- etc-plugins.d-README
- 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 © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
58
inet_pton(), connect() */
55
59
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
58
64
#include <assert.h> /* assert() */
59
65
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
61
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
68
SIOCSIFFLAGS, if_indextoname(),
63
69
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
65
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
74
getuid(), getgid(), seteuid(),
67
75
setgid() */
68
76
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
70
78
#include <argp.h> /* struct argp_option, error_t, struct
71
79
argp_state, struct argp,
72
80
argp_parse(), ARGP_KEY_ARG,
73
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
74
89
75
90
/* Avahi */
76
91
/* All Avahi types, constants and functions
89
104
gnutls_*
90
105
init_gnutls_session(),
91
106
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
93
109
GNUTLS_OPENPGP_FMT_BASE64 */
94
110
95
111
/* GPGME */
101
117
102
118
#define BUFFER_SIZE 256
103
119
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
120
#define PATHDIR "/conf/conf.d/mandos"
109
121
#define SECKEY "seckey.txt"
110
122
#define PUBKEY "pubkey.txt"
111
123
112
124
bool debug = false;
113
125
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
126
const char *argp_program_version = "mandos-client " VERSION;
115
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
128
117
129
/* Used for passing in values through the Avahi callback functions */
125
137
gpgme_ctx_t ctx;
126
138
} mandos_context;
127
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
145
sig_atomic_t quit_now = 0;
146
int signal_received = 0;
147
128
148
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
149
* Make additional room in "buffer" for at least BUFFER_SIZE more
150
* bytes. "buffer_capacity" is how much is currently allocated,
131
151
* "buffer_length" is how much is already used.
132
152
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
153
size_t incbuffer(char **buffer, size_t buffer_length,
134
154
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
155
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
156
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
157
if(buffer == NULL){
138
158
return 0;
139
159
}
140
160
buffer_capacity += BUFFER_SIZE;
145
165
/*
146
166
* Initialize GPGME.
147
167
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
168
static bool init_gpgme(const char *seckey,
149
169
const char *pubkey, const char *tempdir){
150
int ret;
151
170
gpgme_error_t rc;
152
171
gpgme_engine_info_t engine_info;
153
172
154
173
155
174
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
175
* Helper function to insert pub and seckey to the engine keyring.
157
176
*/
158
177
bool import_key(const char *filename){
178
int ret;
159
179
int fd;
160
180
gpgme_data_t pgp_data;
161
181
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
182
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
183
if(fd == -1){
164
184
perror("open");
165
185
return false;
166
186
}
167
187
168
188
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
189
if(rc != GPG_ERR_NO_ERROR){
170
190
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
191
gpgme_strsource(rc), gpgme_strerror(rc));
172
192
return false;
173
193
}
174
194
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
195
rc = gpgme_op_import(mc.ctx, pgp_data);
196
if(rc != GPG_ERR_NO_ERROR){
177
197
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
198
gpgme_strsource(rc), gpgme_strerror(rc));
179
199
return false;
180
200
}
181
201
182
ret = TEMP_FAILURE_RETRY(close(fd));
202
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
203
if(ret == -1){
184
204
perror("close");
185
205
}
187
207
return true;
188
208
}
189
209
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
210
if(debug){
211
fprintf(stderr, "Initializing GPGME\n");
192
212
}
193
213
194
214
/* Init GPGME */
195
215
gpgme_check_version(NULL);
196
216
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
217
if(rc != GPG_ERR_NO_ERROR){
198
218
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
219
gpgme_strsource(rc), gpgme_strerror(rc));
200
220
return false;
201
221
}
202
222
203
223
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
224
rc = gpgme_get_engine_info(&engine_info);
225
if(rc != GPG_ERR_NO_ERROR){
206
226
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
227
gpgme_strsource(rc), gpgme_strerror(rc));
208
228
return false;
221
241
}
222
242
223
243
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
244
rc = gpgme_new(&(mc.ctx));
245
if(rc != GPG_ERR_NO_ERROR){
226
246
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
247
gpgme_strsource(rc), gpgme_strerror(rc));
228
248
return false;
229
249
}
230
250
231
if (not import_key(pubkey) or not import_key(seckey)){
251
if(not import_key(pubkey) or not import_key(seckey)){
232
252
return false;
233
253
}
234
254
235
return true;
255
return true;
236
256
}
237
257
238
258
/*
239
259
* Decrypt OpenPGP data.
240
260
* Returns -1 on error
241
261
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
262
static ssize_t pgp_packet_decrypt(const char *cryptotext,
263
size_t crypto_size,
264
char **plaintext){
246
265
gpgme_data_t dh_crypto, dh_plain;
247
266
gpgme_error_t rc;
248
267
ssize_t ret;
249
268
size_t plaintext_capacity = 0;
250
269
ssize_t plaintext_length = 0;
251
270
252
if (debug){
271
if(debug){
253
272
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
273
}
255
274
256
275
/* Create new GPGME data buffer from memory cryptotext */
257
276
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
277
0);
259
if (rc != GPG_ERR_NO_ERROR){
278
if(rc != GPG_ERR_NO_ERROR){
260
279
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
280
gpgme_strsource(rc), gpgme_strerror(rc));
262
281
return -1;
264
283
265
284
/* Create new empty GPGME data buffer for the plaintext */
266
285
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
286
if(rc != GPG_ERR_NO_ERROR){
268
287
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
288
gpgme_strsource(rc), gpgme_strerror(rc));
270
289
gpgme_data_release(dh_crypto);
273
292
274
293
/* Decrypt data from the cryptotext data buffer to the plaintext
275
294
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
295
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
296
if(rc != GPG_ERR_NO_ERROR){
278
297
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
298
gpgme_strsource(rc), gpgme_strerror(rc));
280
299
plaintext_length = -1;
281
if (debug){
300
if(debug){
282
301
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
302
result = gpgme_op_decrypt_result(mc.ctx);
303
if(result == NULL){
285
304
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
305
} else {
287
306
fprintf(stderr, "Unsupported algorithm: %s\n",
293
312
}
294
313
gpgme_recipient_t recipient;
295
314
recipient = result->recipients;
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
}
315
while(recipient != NULL){
316
fprintf(stderr, "Public key algorithm: %s\n",
317
gpgme_pubkey_algo_name(recipient->pubkey_algo));
318
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
319
fprintf(stderr, "Secret key available: %s\n",
320
recipient->status == GPG_ERR_NO_SECKEY
321
? "No" : "Yes");
322
recipient = recipient->next;
306
323
}
307
324
}
308
325
}
314
331
}
315
332
316
333
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
334
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
318
335
perror("gpgme_data_seek");
319
336
plaintext_length = -1;
320
337
goto decrypt_end;
322
339
323
340
*plaintext = NULL;
324
341
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
342
plaintext_capacity = incbuffer(plaintext,
326
343
(size_t)plaintext_length,
327
344
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
345
if(plaintext_capacity == 0){
346
perror("incbuffer");
330
347
plaintext_length = -1;
331
348
goto decrypt_end;
332
349
}
334
351
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
352
BUFFER_SIZE);
336
353
/* Print the data, if any */
337
if (ret == 0){
354
if(ret == 0){
338
355
/* EOF */
339
356
break;
340
357
}
364
381
return plaintext_length;
365
382
}
366
383
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
384
static const char * safer_gnutls_strerror(int value){
385
const char *ret = gnutls_strerror(value); /* Spurious warning from
386
-Wunreachable-code */
387
if(ret == NULL)
370
388
ret = "(unknown)";
371
389
return ret;
372
390
}
377
395
fprintf(stderr, "GnuTLS: %s", string);
378
396
}
379
397
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
398
static int init_gnutls_global(const char *pubkeyfilename,
382
399
const char *seckeyfilename){
383
400
int ret;
384
401
387
404
}
388
405
389
406
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
407
if(ret != GNUTLS_E_SUCCESS){
408
fprintf(stderr, "GnuTLS global_init: %s\n",
409
safer_gnutls_strerror(ret));
393
410
return -1;
394
411
}
395
412
396
if (debug){
413
if(debug){
397
414
/* "Use a log level over 10 to enable all debugging options."
398
415
* - GnuTLS manual
399
416
*/
402
419
}
403
420
404
421
/* OpenPGP credentials */
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 ();
422
gnutls_certificate_allocate_credentials(&mc.cred);
423
if(ret != GNUTLS_E_SUCCESS){
424
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
from
426
-Wunreachable-code
427
*/
428
safer_gnutls_strerror(ret));
429
gnutls_global_deinit();
411
430
return -1;
412
431
}
413
432
418
437
}
419
438
420
439
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
440
(mc.cred, pubkeyfilename, seckeyfilename,
422
441
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
442
if(ret != GNUTLS_E_SUCCESS){
424
443
fprintf(stderr,
425
444
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
445
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
449
}
431
450
432
451
/* GnuTLS server initialization */
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));
452
ret = gnutls_dh_params_init(&mc.dh_params);
453
if(ret != GNUTLS_E_SUCCESS){
454
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
455
" %s\n", safer_gnutls_strerror(ret));
437
456
goto globalfail;
438
457
}
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));
458
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
459
if(ret != GNUTLS_E_SUCCESS){
460
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
461
safer_gnutls_strerror(ret));
443
462
goto globalfail;
444
463
}
445
464
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
465
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
466
448
467
return 0;
449
468
450
469
globalfail:
451
470
452
gnutls_certificate_free_credentials(mc->cred);
471
gnutls_certificate_free_credentials(mc.cred);
453
472
gnutls_global_deinit();
454
gnutls_dh_params_deinit(mc->dh_params);
473
gnutls_dh_params_deinit(mc.dh_params);
455
474
return -1;
456
475
}
457
476
458
static int init_gnutls_session(mandos_context *mc,
459
gnutls_session_t *session){
477
static int init_gnutls_session(gnutls_session_t *session){
460
478
int ret;
461
479
/* GnuTLS session creation */
462
ret = gnutls_init(session, GNUTLS_SERVER);
463
if (ret != GNUTLS_E_SUCCESS){
480
do {
481
ret = gnutls_init(session, GNUTLS_SERVER);
482
if(quit_now){
483
return -1;
484
}
485
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
486
if(ret != GNUTLS_E_SUCCESS){
464
487
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
465
488
safer_gnutls_strerror(ret));
466
489
}
467
490
468
491
{
469
492
const char *err;
470
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
471
if (ret != GNUTLS_E_SUCCESS) {
493
do {
494
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
495
if(quit_now){
496
gnutls_deinit(*session);
497
return -1;
498
}
499
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
500
if(ret != GNUTLS_E_SUCCESS){
472
501
fprintf(stderr, "Syntax error at: %s\n", err);
473
502
fprintf(stderr, "GnuTLS error: %s\n",
474
503
safer_gnutls_strerror(ret));
475
gnutls_deinit (*session);
504
gnutls_deinit(*session);
476
505
return -1;
477
506
}
478
507
}
479
508
480
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
481
mc->cred);
482
if (ret != GNUTLS_E_SUCCESS) {
509
do {
510
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
511
mc.cred);
512
if(quit_now){
513
gnutls_deinit(*session);
514
return -1;
515
}
516
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
517
if(ret != GNUTLS_E_SUCCESS){
483
518
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
484
519
safer_gnutls_strerror(ret));
485
gnutls_deinit (*session);
520
gnutls_deinit(*session);
486
521
return -1;
487
522
}
488
523
489
524
/* ignore client certificate if any. */
490
gnutls_certificate_server_set_request (*session,
491
GNUTLS_CERT_IGNORE);
525
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
492
526
493
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
527
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
494
528
495
529
return 0;
496
530
}
502
536
/* Called when a Mandos server is found */
503
537
static int start_mandos_communication(const char *ip, uint16_t port,
504
538
AvahiIfIndex if_index,
505
mandos_context *mc){
506
int ret, tcp_sd;
507
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
539
int af){
540
int ret, tcp_sd = -1;
541
ssize_t sret;
542
union {
543
struct sockaddr_in in;
544
struct sockaddr_in6 in6;
545
} to;
508
546
char *buffer = NULL;
509
547
char *decrypted_buffer;
510
548
size_t buffer_length = 0;
511
549
size_t buffer_capacity = 0;
512
ssize_t decrypted_buffer_size;
513
550
size_t written;
514
551
int retval = 0;
515
char interface[IF_NAMESIZE];
516
552
gnutls_session_t session;
517
518
ret = init_gnutls_session (mc, &session);
519
if (ret != 0){
553
int pf; /* Protocol family */
554
555
if(quit_now){
556
return -1;
557
}
558
559
switch(af){
560
case AF_INET6:
561
pf = PF_INET6;
562
break;
563
case AF_INET:
564
pf = PF_INET;
565
break;
566
default:
567
fprintf(stderr, "Bad address family: %d\n", af);
568
return -1;
569
}
570
571
ret = init_gnutls_session(&session);
572
if(ret != 0){
520
573
return -1;
521
574
}
522
575
523
576
if(debug){
524
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
577
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
525
578
"\n", ip, port);
526
579
}
527
580
528
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
529
if(tcp_sd < 0) {
581
tcp_sd = socket(pf, SOCK_STREAM, 0);
582
if(tcp_sd < 0){
530
583
perror("socket");
531
return -1;
584
retval = -1;
585
goto mandos_end;
532
586
}
533
587
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);
588
if(quit_now){
589
retval = -1;
590
goto mandos_end;
540
591
}
541
592
542
593
memset(&to, 0, sizeof(to));
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 ){
594
if(af == AF_INET6){
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
597
} else { /* IPv4 */
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
600
}
601
if(ret < 0 ){
548
602
perror("inet_pton");
549
return -1;
603
retval = -1;
604
goto mandos_end;
550
605
}
551
606
if(ret == 0){
552
607
fprintf(stderr, "Bad address: %s\n", ip);
553
return -1;
554
}
555
to.in6.sin6_port = htons(port); /* Spurious warning */
608
retval = -1;
609
goto mandos_end;
610
}
611
if(af == AF_INET6){
612
to.in6.sin6_port = htons(port); /* Spurious warnings from
613
-Wconversion and
614
-Wunreachable-code */
615
616
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
617
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
618
-Wunreachable-code*/
619
if(if_index == AVAHI_IF_UNSPEC){
620
fprintf(stderr, "An IPv6 link-local address is incomplete"
621
" without a network interface\n");
622
retval = -1;
623
goto mandos_end;
624
}
625
/* Set the network interface number as scope */
626
to.in6.sin6_scope_id = (uint32_t)if_index;
627
}
628
} else {
629
to.in.sin_port = htons(port); /* Spurious warnings from
630
-Wconversion and
631
-Wunreachable-code */
632
}
556
633
557
to.in6.sin6_scope_id = (uint32_t)if_index;
634
if(quit_now){
635
retval = -1;
636
goto mandos_end;
637
}
558
638
559
639
if(debug){
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){
640
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
641
char interface[IF_NAMESIZE];
642
if(if_indextoname((unsigned int)if_index, interface) == NULL){
643
perror("if_indextoname");
644
} else {
645
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
646
ip, interface, port);
647
}
648
} else {
649
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
650
port);
651
}
652
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
653
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
654
const char *pcret;
655
if(af == AF_INET6){
656
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
657
sizeof(addrstr));
658
} else {
659
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
660
sizeof(addrstr));
661
}
662
if(pcret == NULL){
565
663
perror("inet_ntop");
566
664
} else {
567
665
if(strcmp(addrstr, ip) != 0){
570
668
}
571
669
}
572
670
573
ret = connect(tcp_sd, &to.in, sizeof(to));
574
if (ret < 0){
671
if(quit_now){
672
retval = -1;
673
goto mandos_end;
674
}
675
676
if(af == AF_INET6){
677
ret = connect(tcp_sd, &to.in6, sizeof(to));
678
} else {
679
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
680
}
681
if(ret < 0){
575
682
perror("connect");
576
return -1;
683
retval = -1;
684
goto mandos_end;
685
}
686
687
if(quit_now){
688
retval = -1;
689
goto mandos_end;
577
690
}
578
691
579
692
const char *out = mandos_protocol_version;
580
693
written = 0;
581
while (true){
694
while(true){
582
695
size_t out_size = strlen(out);
583
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
696
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
584
697
out_size - written));
585
if (ret == -1){
698
if(ret == -1){
586
699
perror("write");
587
700
retval = -1;
588
701
goto mandos_end;
591
704
if(written < out_size){
592
705
continue;
593
706
} else {
594
if (out == mandos_protocol_version){
707
if(out == mandos_protocol_version){
595
708
written = 0;
596
709
out = "\r\n";
597
710
} else {
598
711
break;
599
712
}
600
713
}
714
715
if(quit_now){
716
retval = -1;
717
goto mandos_end;
718
}
601
719
}
602
720
603
721
if(debug){
604
722
fprintf(stderr, "Establishing TLS session with %s\n", ip);
605
723
}
606
724
607
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
608
609
do{
610
ret = gnutls_handshake (session);
725
if(quit_now){
726
retval = -1;
727
goto mandos_end;
728
}
729
730
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
731
732
if(quit_now){
733
retval = -1;
734
goto mandos_end;
735
}
736
737
do {
738
ret = gnutls_handshake(session);
739
if(quit_now){
740
retval = -1;
741
goto mandos_end;
742
}
611
743
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
612
744
613
if (ret != GNUTLS_E_SUCCESS){
745
if(ret != GNUTLS_E_SUCCESS){
614
746
if(debug){
615
747
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
616
gnutls_perror (ret);
748
gnutls_perror(ret);
617
749
}
618
750
retval = -1;
619
751
goto mandos_end;
622
754
/* Read OpenPGP packet that contains the wanted password */
623
755
624
756
if(debug){
625
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
757
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
626
758
ip);
627
759
}
628
760
629
761
while(true){
630
buffer_capacity = adjustbuffer(&buffer, buffer_length,
762
763
if(quit_now){
764
retval = -1;
765
goto mandos_end;
766
}
767
768
buffer_capacity = incbuffer(&buffer, buffer_length,
631
769
buffer_capacity);
632
if (buffer_capacity == 0){
633
perror("adjustbuffer");
634
retval = -1;
635
goto mandos_end;
636
}
637
638
ret = gnutls_record_recv(session, buffer+buffer_length,
639
BUFFER_SIZE);
640
if (ret == 0){
770
if(buffer_capacity == 0){
771
perror("incbuffer");
772
retval = -1;
773
goto mandos_end;
774
}
775
776
if(quit_now){
777
retval = -1;
778
goto mandos_end;
779
}
780
781
sret = gnutls_record_recv(session, buffer+buffer_length,
782
BUFFER_SIZE);
783
if(sret == 0){
641
784
break;
642
785
}
643
if (ret < 0){
644
switch(ret){
786
if(sret < 0){
787
switch(sret){
645
788
case GNUTLS_E_INTERRUPTED:
646
789
case GNUTLS_E_AGAIN:
647
790
break;
648
791
case GNUTLS_E_REHANDSHAKE:
649
do{
650
ret = gnutls_handshake (session);
792
do {
793
ret = gnutls_handshake(session);
794
795
if(quit_now){
796
retval = -1;
797
goto mandos_end;
798
}
651
799
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
652
if (ret < 0){
800
if(ret < 0){
653
801
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
654
gnutls_perror (ret);
802
gnutls_perror(ret);
655
803
retval = -1;
656
804
goto mandos_end;
657
805
}
660
808
fprintf(stderr, "Unknown error while reading data from"
661
809
" encrypted session with Mandos server\n");
662
810
retval = -1;
663
gnutls_bye (session, GNUTLS_SHUT_RDWR);
811
gnutls_bye(session, GNUTLS_SHUT_RDWR);
664
812
goto mandos_end;
665
813
}
666
814
} else {
667
buffer_length += (size_t) ret;
815
buffer_length += (size_t) sret;
668
816
}
669
817
}
670
818
672
820
fprintf(stderr, "Closing TLS session\n");
673
821
}
674
822
675
gnutls_bye (session, GNUTLS_SHUT_RDWR);
676
677
if (buffer_length > 0){
678
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
823
if(quit_now){
824
retval = -1;
825
goto mandos_end;
826
}
827
828
do {
829
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
830
if(quit_now){
831
retval = -1;
832
goto mandos_end;
833
}
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
835
836
if(buffer_length > 0){
837
ssize_t decrypted_buffer_size;
838
decrypted_buffer_size = pgp_packet_decrypt(buffer,
679
839
buffer_length,
680
840
&decrypted_buffer);
681
if (decrypted_buffer_size >= 0){
841
if(decrypted_buffer_size >= 0){
842
682
843
written = 0;
683
844
while(written < (size_t) decrypted_buffer_size){
684
ret = (int)fwrite (decrypted_buffer + written, 1,
685
(size_t)decrypted_buffer_size - written,
686
stdout);
845
if(quit_now){
846
retval = -1;
847
goto mandos_end;
848
}
849
850
ret = (int)fwrite(decrypted_buffer + written, 1,
851
(size_t)decrypted_buffer_size - written,
852
stdout);
687
853
if(ret == 0 and ferror(stdout)){
688
854
if(debug){
689
855
fprintf(stderr, "Error writing encrypted data: %s\n",
706
872
707
873
mandos_end:
708
874
free(buffer);
709
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
875
if(tcp_sd >= 0){
876
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
877
}
710
878
if(ret == -1){
711
879
perror("close");
712
880
}
713
gnutls_deinit (session);
881
gnutls_deinit(session);
882
if(quit_now){
883
retval = -1;
884
}
714
885
return retval;
715
886
}
716
887
717
888
static void resolve_callback(AvahiSServiceResolver *r,
718
889
AvahiIfIndex interface,
719
AVAHI_GCC_UNUSED AvahiProtocol protocol,
890
AvahiProtocol proto,
720
891
AvahiResolverEvent event,
721
892
const char *name,
722
893
const char *type,
727
898
AVAHI_GCC_UNUSED AvahiStringList *txt,
728
899
AVAHI_GCC_UNUSED AvahiLookupResultFlags
729
900
flags,
730
void* userdata) {
731
mandos_context *mc = userdata;
901
AVAHI_GCC_UNUSED void* userdata){
732
902
assert(r);
733
903
734
904
/* Called whenever a service has been resolved successfully or
735
905
timed out */
736
906
737
switch (event) {
907
if(quit_now){
908
return;
909
}
910
911
switch(event){
738
912
default:
739
913
case AVAHI_RESOLVER_FAILURE:
740
914
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
741
915
" of type '%s' in domain '%s': %s\n", name, type, domain,
742
avahi_strerror(avahi_server_errno(mc->server)));
916
avahi_strerror(avahi_server_errno(mc.server)));
743
917
break;
744
918
745
919
case AVAHI_RESOLVER_FOUND:
748
922
avahi_address_snprint(ip, sizeof(ip), address);
749
923
if(debug){
750
924
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
752
interface, port);
925
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
926
ip, (intmax_t)interface, port);
753
927
}
754
int ret = start_mandos_communication(ip, port, interface, mc);
755
if (ret == 0){
756
avahi_simple_poll_quit(mc->simple_poll);
928
int ret = start_mandos_communication(ip, port, interface,
929
avahi_proto_to_af(proto));
930
if(ret == 0){
931
avahi_simple_poll_quit(mc.simple_poll);
757
932
}
758
933
}
759
934
}
760
935
avahi_s_service_resolver_free(r);
761
936
}
762
937
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;
938
static void browse_callback(AvahiSServiceBrowser *b,
939
AvahiIfIndex interface,
940
AvahiProtocol protocol,
941
AvahiBrowserEvent event,
942
const char *name,
943
const char *type,
944
const char *domain,
945
AVAHI_GCC_UNUSED AvahiLookupResultFlags
946
flags,
947
AVAHI_GCC_UNUSED void* userdata){
774
948
assert(b);
775
949
776
950
/* Called whenever a new services becomes available on the LAN or
777
951
is removed from the LAN */
778
952
779
switch (event) {
953
if(quit_now){
954
return;
955
}
956
957
switch(event){
780
958
default:
781
959
case AVAHI_BROWSER_FAILURE:
782
960
783
961
fprintf(stderr, "(Avahi browser) %s\n",
784
avahi_strerror(avahi_server_errno(mc->server)));
785
avahi_simple_poll_quit(mc->simple_poll);
962
avahi_strerror(avahi_server_errno(mc.server)));
963
avahi_simple_poll_quit(mc.simple_poll);
786
964
return;
787
965
788
966
case AVAHI_BROWSER_NEW:
791
969
the callback function is called the Avahi server will free the
792
970
resolver for us. */
793
971
794
if (!(avahi_s_service_resolver_new(mc->server, interface,
795
protocol, name, type, domain,
796
AVAHI_PROTO_INET6, 0,
797
resolve_callback, mc)))
972
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
973
name, type, domain, protocol, 0,
974
resolve_callback, NULL) == NULL)
798
975
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
799
name, avahi_strerror(avahi_server_errno(mc->server)));
976
name, avahi_strerror(avahi_server_errno(mc.server)));
800
977
break;
801
978
802
979
case AVAHI_BROWSER_REMOVE:
811
988
}
812
989
}
813
990
991
/* stop main loop after sigterm has been called */
992
static void handle_sigterm(int sig){
993
if(quit_now){
994
return;
995
}
996
quit_now = 1;
997
signal_received = sig;
998
int old_errno = errno;
999
if(mc.simple_poll != NULL){
1000
avahi_simple_poll_quit(mc.simple_poll);
1001
}
1002
errno = old_errno;
1003
}
1004
814
1005
int main(int argc, char *argv[]){
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
1006
AvahiSServiceBrowser *sb = NULL;
1007
int error;
1008
int ret;
1009
intmax_t tmpmax;
1010
char *tmp;
1011
int exitcode = EXIT_SUCCESS;
1012
const char *interface = "eth0";
1013
struct ifreq network;
1014
int sd = -1;
1015
bool take_down_interface = false;
1016
uid_t uid;
1017
gid_t gid;
1018
char *connect_to = NULL;
1019
char tempdir[] = "/tmp/mandosXXXXXX";
1020
bool tempdir_created = false;
1021
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1022
const char *seckey = PATHDIR "/" SECKEY;
1023
const char *pubkey = PATHDIR "/" PUBKEY;
1024
1025
bool gnutls_initialized = false;
1026
bool gpgme_initialized = false;
1027
float delay = 2.5f;
1028
1029
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1030
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1031
1032
uid = getuid();
1033
gid = getgid();
1034
1035
/* Lower any group privileges we might have, just to be safe */
1036
errno = 0;
1037
ret = setgid(gid);
1038
if(ret == -1){
1039
perror("setgid");
1040
}
1041
1042
/* Lower user privileges (temporarily) */
1043
errno = 0;
1044
ret = seteuid(uid);
1045
if(ret == -1){
1046
perror("seteuid");
1047
}
1048
1049
if(quit_now){
1050
goto end;
1051
}
1052
1053
{
1054
struct argp_option options[] = {
1055
{ .name = "debug", .key = 128,
1056
.doc = "Debug mode", .group = 3 },
1057
{ .name = "connect", .key = 'c',
1058
.arg = "ADDRESS:PORT",
1059
.doc = "Connect directly to a specific Mandos server",
1060
.group = 1 },
1061
{ .name = "interface", .key = 'i',
1062
.arg = "NAME",
1063
.doc = "Network interface that will be used to search for"
1064
" Mandos servers",
1065
.group = 1 },
1066
{ .name = "seckey", .key = 's',
1067
.arg = "FILE",
1068
.doc = "OpenPGP secret key file base name",
1069
.group = 1 },
1070
{ .name = "pubkey", .key = 'p',
1071
.arg = "FILE",
1072
.doc = "OpenPGP public key file base name",
1073
.group = 2 },
1074
{ .name = "dh-bits", .key = 129,
1075
.arg = "BITS",
1076
.doc = "Bit length of the prime number used in the"
1077
" Diffie-Hellman key exchange",
1078
.group = 2 },
1079
{ .name = "priority", .key = 130,
1080
.arg = "STRING",
1081
.doc = "GnuTLS priority string for the TLS handshake",
1082
.group = 1 },
1083
{ .name = "delay", .key = 131,
1084
.arg = "SECONDS",
1085
.doc = "Maximum delay to wait for interface startup",
1086
.group = 2 },
1087
{ .name = NULL }
1088
};
1089
1090
error_t parse_opt(int key, char *arg,
1091
struct argp_state *state){
1092
switch(key){
1093
case 128: /* --debug */
1094
debug = true;
1095
break;
1096
case 'c': /* --connect */
1097
connect_to = arg;
1098
break;
1099
case 'i': /* --interface */
1100
interface = arg;
1101
break;
1102
case 's': /* --seckey */
1103
seckey = arg;
1104
break;
1105
case 'p': /* --pubkey */
1106
pubkey = arg;
1107
break;
1108
case 129: /* --dh-bits */
1109
errno = 0;
1110
tmpmax = strtoimax(arg, &tmp, 10);
1111
if(errno != 0 or tmp == arg or *tmp != '\0'
1112
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1113
fprintf(stderr, "Bad number of DH bits\n");
1114
exit(EXIT_FAILURE);
1115
}
1116
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1117
break;
1118
case 130: /* --priority */
1119
mc.priority = arg;
1120
break;
1121
case 131: /* --delay */
1122
errno = 0;
1123
delay = strtof(arg, &tmp);
1124
if(errno != 0 or tmp == arg or *tmp != '\0'){
1125
fprintf(stderr, "Bad delay\n");
1126
exit(EXIT_FAILURE);
1127
}
1128
break;
1129
case ARGP_KEY_ARG:
1130
argp_usage(state);
1131
case ARGP_KEY_END:
1132
break;
1133
default:
1134
return ARGP_ERR_UNKNOWN;
1135
}
1136
return 0;
1137
}
1138
1139
struct argp argp = { .options = options, .parser = parse_opt,
1140
.args_doc = "",
1141
.doc = "Mandos client -- Get and decrypt"
1142
" passwords from a Mandos server" };
1143
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1144
if(ret == ARGP_ERR_UNKNOWN){
1145
fprintf(stderr, "Unknown error while parsing arguments\n");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
}
1150
1151
if(not debug){
1152
avahi_set_log_function(empty_log);
1153
}
1154
1155
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1156
from the signal handler */
1157
/* Initialize the pseudo-RNG for Avahi */
1158
srand((unsigned int) time(NULL));
1159
mc.simple_poll = avahi_simple_poll_new();
1160
if(mc.simple_poll == NULL){
1161
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1162
exitcode = EXIT_FAILURE;
1163
goto end;
1164
}
1165
1166
sigemptyset(&sigterm_action.sa_mask);
1167
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1168
if(ret == -1){
1169
perror("sigaddset");
1170
exitcode = EXIT_FAILURE;
1171
goto end;
1172
}
1173
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1174
if(ret == -1){
1175
perror("sigaddset");
1176
exitcode = EXIT_FAILURE;
1177
goto end;
1178
}
1179
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1180
if(ret == -1){
1181
perror("sigaddset");
1182
exitcode = EXIT_FAILURE;
1183
goto end;
1184
}
1185
/* Need to check if the handler is SIG_IGN before handling:
1186
| [[info:libc:Initial Signal Actions]] |
1187
| [[info:libc:Basic Signal Handling]] |
1188
*/
1189
ret = sigaction(SIGINT, 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(SIGINT, &sigterm_action, NULL);
1196
if(ret == -1){
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1199
goto end;
1200
}
1201
}
1202
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1203
if(ret == -1){
1204
perror("sigaction");
1205
return EXIT_FAILURE;
1206
}
1207
if(old_sigterm_action.sa_handler != SIG_IGN){
1208
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1209
if(ret == -1){
1210
perror("sigaction");
1211
exitcode = EXIT_FAILURE;
1212
goto end;
1213
}
1214
}
1215
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1216
if(ret == -1){
1217
perror("sigaction");
1218
return EXIT_FAILURE;
1219
}
1220
if(old_sigterm_action.sa_handler != SIG_IGN){
1221
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1222
if(ret == -1){
1223
perror("sigaction");
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
}
1228
1229
/* If the interface is down, bring it up */
1230
if(interface[0] != '\0'){
988
1231
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
1232
if(if_index == 0){
990
1233
fprintf(stderr, "No such interface: \"%s\"\n", interface);
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
1234
exitcode = EXIT_FAILURE;
1235
goto end;
1236
}
1237
1238
if(quit_now){
1239
goto end;
1240
}
1241
1242
/* Re-raise priviliges */
1243
errno = 0;
1244
ret = seteuid(0);
1245
if(ret == -1){
1246
perror("seteuid");
1247
}
1248
1249
#ifdef __linux__
1250
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1251
messages to mess up the prompt */
1252
ret = klogctl(8, NULL, 5);
1253
bool restore_loglevel = true;
1254
if(ret == -1){
1255
restore_loglevel = false;
1256
perror("klogctl");
1257
}
1258
#endif /* __linux__ */
1259
1260
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1261
if(sd < 0){
1262
perror("socket");
1263
exitcode = EXIT_FAILURE;
1264
#ifdef __linux__
1265
if(restore_loglevel){
1266
ret = klogctl(7, NULL, 0);
1267
if(ret == -1){
1268
perror("klogctl");
1269
}
1270
}
1271
#endif /* __linux__ */
1272
/* Lower privileges */
1273
errno = 0;
1274
ret = seteuid(uid);
1275
if(ret == -1){
1276
perror("seteuid");
1277
}
1278
goto end;
1279
}
1280
strcpy(network.ifr_name, interface);
1281
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1282
if(ret == -1){
1283
perror("ioctl SIOCGIFFLAGS");
1284
#ifdef __linux__
1285
if(restore_loglevel){
1286
ret = klogctl(7, NULL, 0);
1287
if(ret == -1){
1288
perror("klogctl");
1289
}
1290
}
1291
#endif /* __linux__ */
1292
exitcode = EXIT_FAILURE;
1293
/* Lower privileges */
1294
errno = 0;
1295
ret = seteuid(uid);
1296
if(ret == -1){
1297
perror("seteuid");
1298
}
1299
goto end;
1300
}
1301
if((network.ifr_flags & IFF_UP) == 0){
1302
network.ifr_flags |= IFF_UP;
1303
take_down_interface = true;
1304
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1305
if(ret == -1){
1306
take_down_interface = false;
1307
perror("ioctl SIOCSIFFLAGS");
1308
exitcode = EXIT_FAILURE;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
}
1326
/* sleep checking until interface is running */
1327
for(int i=0; i < delay * 4; i++){
1328
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1329
if(ret == -1){
1330
perror("ioctl SIOCGIFFLAGS");
1331
} else if(network.ifr_flags & IFF_RUNNING){
1332
break;
1333
}
1334
struct timespec sleeptime = { .tv_nsec = 250000000 };
1335
ret = nanosleep(&sleeptime, NULL);
1336
if(ret == -1 and errno != EINTR){
1337
perror("nanosleep");
1338
}
1339
}
1340
if(not take_down_interface){
1341
/* We won't need the socket anymore */
1342
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1343
if(ret == -1){
1344
perror("close");
1345
}
1346
}
1347
#ifdef __linux__
1348
if(restore_loglevel){
1349
/* Restores kernel loglevel to default */
1350
ret = klogctl(7, NULL, 0);
1351
if(ret == -1){
1352
perror("klogctl");
1353
}
1354
}
1355
#endif /* __linux__ */
1356
/* Lower privileges */
1357
errno = 0;
1358
if(take_down_interface){
1359
/* Lower privileges */
1360
ret = seteuid(uid);
1361
if(ret == -1){
1362
perror("seteuid");
1363
}
1364
} else {
1365
/* Lower privileges permanently */
1366
ret = setuid(uid);
1367
if(ret == -1){
1368
perror("setuid");
1369
}
1370
}
1371
}
1372
1373
if(quit_now){
1374
goto end;
1375
}
1376
1377
ret = init_gnutls_global(pubkey, seckey);
1378
if(ret == -1){
1379
fprintf(stderr, "init_gnutls_global failed\n");
1380
exitcode = EXIT_FAILURE;
1381
goto end;
1382
} else {
1383
gnutls_initialized = true;
1384
}
1385
1386
if(quit_now){
1387
goto end;
1388
}
1389
1390
tempdir_created = true;
1391
if(mkdtemp(tempdir) == NULL){
1392
tempdir_created = false;
1393
perror("mkdtemp");
1394
goto end;
1395
}
1396
1397
if(quit_now){
1398
goto end;
1399
}
1400
1401
if(not init_gpgme(pubkey, seckey, tempdir)){
1402
fprintf(stderr, "init_gpgme failed\n");
1403
exitcode = EXIT_FAILURE;
1404
goto end;
1405
} else {
1406
gpgme_initialized = true;
1407
}
1408
1409
if(quit_now){
1410
goto end;
1411
}
1412
1413
if(connect_to != NULL){
1414
/* Connect directly, do not use Zeroconf */
1415
/* (Mainly meant for debugging) */
1416
char *address = strrchr(connect_to, ':');
1417
if(address == NULL){
1418
fprintf(stderr, "No colon in address\n");
1419
exitcode = EXIT_FAILURE;
1420
goto end;
1421
}
1422
1423
if(quit_now){
1424
goto end;
1425
}
1426
1427
uint16_t port;
1428
errno = 0;
1429
tmpmax = strtoimax(address+1, &tmp, 10);
1430
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1431
or tmpmax != (uint16_t)tmpmax){
1432
fprintf(stderr, "Bad port number\n");
1433
exitcode = EXIT_FAILURE;
1434
goto end;
1435
}
1436
1437
if(quit_now){
1438
goto end;
1439
}
1440
1441
port = (uint16_t)tmpmax;
1442
*address = '\0';
1443
address = connect_to;
1444
/* Colon in address indicates IPv6 */
1445
int af;
1446
if(strchr(address, ':') != NULL){
1447
af = AF_INET6;
1448
} else {
1449
af = AF_INET;
1450
}
1451
1452
if(quit_now){
1453
goto end;
1454
}
1455
1456
ret = start_mandos_communication(address, port, if_index, af);
1457
if(ret < 0){
1458
exitcode = EXIT_FAILURE;
1459
} else {
1460
exitcode = EXIT_SUCCESS;
1461
}
1462
goto end;
1463
}
1464
1465
if(quit_now){
1466
goto end;
1467
}
1468
1469
{
1470
AvahiServerConfig config;
1471
/* Do not publish any local Zeroconf records */
1472
avahi_server_config_init(&config);
1473
config.publish_hinfo = 0;
1474
config.publish_addresses = 0;
1475
config.publish_workstation = 0;
1476
config.publish_domain = 0;
1477
1478
/* Allocate a new server */
1479
mc.server = avahi_server_new(avahi_simple_poll_get
1480
(mc.simple_poll), &config, NULL,
1481
NULL, &error);
1482
1483
/* Free the Avahi configuration data */
1484
avahi_server_config_free(&config);
1485
}
1486
1487
/* Check if creating the Avahi server object succeeded */
1488
if(mc.server == NULL){
1489
fprintf(stderr, "Failed to create Avahi server: %s\n",
1490
avahi_strerror(error));
1491
exitcode = EXIT_FAILURE;
1492
goto end;
1493
}
1494
1495
if(quit_now){
1496
goto end;
1497
}
1498
1499
/* Create the Avahi service browser */
1500
sb = avahi_s_service_browser_new(mc.server, if_index,
1501
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1502
NULL, 0, browse_callback, NULL);
1503
if(sb == NULL){
1504
fprintf(stderr, "Failed to create service browser: %s\n",
1505
avahi_strerror(avahi_server_errno(mc.server)));
1506
exitcode = EXIT_FAILURE;
1507
goto end;
1508
}
1509
1510
if(quit_now){
1511
goto end;
1512
}
1513
1514
/* Run the main loop */
1515
1516
if(debug){
1517
fprintf(stderr, "Starting Avahi loop search\n");
1518
}
1519
1520
avahi_simple_poll_loop(mc.simple_poll);
1521
1083
1522
end:
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){
1523
1524
if(debug){
1525
fprintf(stderr, "%s exiting\n", argv[0]);
1526
}
1527
1528
/* Cleanup things */
1529
if(sb != NULL)
1530
avahi_s_service_browser_free(sb);
1531
1532
if(mc.server != NULL)
1533
avahi_server_free(mc.server);
1534
1535
if(mc.simple_poll != NULL)
1536
avahi_simple_poll_free(mc.simple_poll);
1537
1538
if(gnutls_initialized){
1539
gnutls_certificate_free_credentials(mc.cred);
1540
gnutls_global_deinit();
1541
gnutls_dh_params_deinit(mc.dh_params);
1542
}
1543
1544
if(gpgme_initialized){
1545
gpgme_release(mc.ctx);
1546
}
1547
1548
/* Take down the network interface */
1549
if(take_down_interface){
1550
/* Re-raise priviliges */
1551
errno = 0;
1552
ret = seteuid(0);
1553
if(ret == -1){
1554
perror("seteuid");
1555
}
1556
if(geteuid() == 0){
1557
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1558
if(ret == -1){
1559
perror("ioctl SIOCGIFFLAGS");
1560
} else if(network.ifr_flags & IFF_UP) {
1561
network.ifr_flags &= ~IFF_UP; /* clear flag */
1562
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1563
if(ret == -1){
1564
perror("ioctl SIOCSIFFLAGS");
1565
}
1566
}
1567
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1568
if(ret == -1){
1569
perror("close");
1570
}
1571
/* Lower privileges permanently */
1572
errno = 0;
1573
ret = setuid(uid);
1574
if(ret == -1){
1575
perror("setuid");
1576
}
1577
}
1578
}
1579
1580
/* Removes the temp directory used by GPGME */
1581
if(tempdir_created){
1582
DIR *d;
1583
struct dirent *direntry;
1584
d = opendir(tempdir);
1585
if(d == NULL){
1586
if(errno != ENOENT){
1115
1587
perror("opendir");
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;
1588
}
1589
} else {
1590
while(true){
1591
direntry = readdir(d);
1592
if(direntry == NULL){
1593
break;
1594
}
1595
/* Skip "." and ".." */
1596
if(direntry->d_name[0] == '.'
1597
and (direntry->d_name[1] == '\0'
1598
or (direntry->d_name[1] == '.'
1599
and direntry->d_name[2] == '\0'))){
1600
continue;
1601
}
1602
char *fullname = NULL;
1603
ret = asprintf(&fullname, "%s/%s", tempdir,
1604
direntry->d_name);
1605
if(ret < 0){
1606
perror("asprintf");
1607
continue;
1608
}
1609
ret = remove(fullname);
1610
if(ret == -1){
1611
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1612
strerror(errno));
1613
}
1614
free(fullname);
1615
}
1616
closedir(d);
1617
}
1618
ret = rmdir(tempdir);
1619
if(ret == -1 and errno != ENOENT){
1620
perror("rmdir");
1621
}
1622
}
1623
1624
if(quit_now){
1625
sigemptyset(&old_sigterm_action.sa_mask);
1626
old_sigterm_action.sa_handler = SIG_DFL;
1627
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1628
if(ret == -1){
1629
perror("sigaction");
1630
}
1631
raise(signal_received);
1632
}
1633
1634
return exitcode;
1147
1635
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0