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148
(compared to revision 237.2.116)
: plugins.d/password-request.c
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- Committer: Teddy Hogeborn
- Date: 2008-09-03 17:34:29 UTC
- Revision ID: teddy@fukt.bsnet.se-20080903173429-db2mjtddf7mgbx8z
* plugins.d/password-request.xml (OVERVIEW): Refer to
password-prompt(8) by
name.
(SECURITY): Improved wording. Add paragraph about insecurity of
ping.
(SEE ALSO): Add references to cryptsetup(8) and crypttab(5).
Changed to be a <variablelist> and added text.
password-prompt(8) by
name.
(SECURITY): Improved wording. Add paragraph about insecurity of
ping.
(SEE ALSO): Add references to cryptsetup(8) and crypttab(5).
Changed to be a <variablelist> and added text.
- files added:
- plugins.d/usplash
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- .bzrignore
added
removed
plugins.d/password-request.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 */
56
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
56
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
62
getuid(), getgid(), setuid(),
75
63
setgid() */
64
#include <netinet/in.h>
76
65
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
84
sig_atomic_t */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
71
90
72
/* Avahi */
91
73
/* All Avahi types, constants and functions
104
86
gnutls_*
105
87
init_gnutls_session(),
106
88
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
90
GNUTLS_OPENPGP_FMT_BASE64 */
110
91
111
92
/* GPGME */
117
98
118
99
#define BUFFER_SIZE 256
119
100
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
125
103
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
127
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
106
129
107
/* Used for passing in values through the Avahi callback functions */
134
112
unsigned int dh_bits;
135
113
gnutls_dh_params_t dh_params;
136
114
const char *priority;
137
gpgme_ctx_t ctx;
138
115
} mandos_context;
139
116
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
117
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
148
120
* "buffer_length" is how much is already used.
149
121
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
123
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
126
if (buffer == NULL){
155
127
return 0;
156
128
}
157
129
buffer_capacity += BUFFER_SIZE;
160
132
}
161
133
162
134
/*
163
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
164
137
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
168
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
169
148
gpgme_engine_info_t engine_info;
170
149
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
152
}
210
153
211
154
/* Init GPGME */
212
155
gpgme_check_version(NULL);
213
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
215
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
159
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
160
return -1;
218
161
}
219
162
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
223
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
167
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
168
return -1;
226
169
}
227
170
while(engine_info != NULL){
228
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
231
174
break;
232
175
}
233
176
engine_info = engine_info->next;
234
177
}
235
178
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
270
181
}
271
182
272
183
/* Create new GPGME data buffer from memory cryptotext */
273
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
185
0);
275
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
276
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
188
gpgme_strsource(rc), gpgme_strerror(rc));
278
189
return -1;
280
191
281
192
/* Create new empty GPGME data buffer for the plaintext */
282
193
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
284
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
196
gpgme_strsource(rc), gpgme_strerror(rc));
286
197
gpgme_data_release(dh_crypto);
287
198
return -1;
288
199
}
289
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
290
210
/* Decrypt data from the cryptotext data buffer to the plaintext
291
211
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
294
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
215
gpgme_strsource(rc), gpgme_strerror(rc));
296
216
plaintext_length = -1;
297
if(debug){
217
if (debug){
298
218
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
301
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
222
} else {
303
223
fprintf(stderr, "Unsupported algorithm: %s\n",
309
229
}
310
230
gpgme_recipient_t recipient;
311
231
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;
232
if(recipient){
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
239
? "No" : "Yes");
240
recipient = recipient->next;
241
}
320
242
}
321
243
}
322
244
}
328
250
}
329
251
330
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
333
255
plaintext_length = -1;
334
256
goto decrypt_end;
335
257
}
336
258
337
259
*plaintext = NULL;
338
260
while(true){
339
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
340
262
(size_t)plaintext_length,
341
263
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
344
266
plaintext_length = -1;
345
267
goto decrypt_end;
346
268
}
348
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
271
BUFFER_SIZE);
350
272
/* Print the data, if any */
351
if(ret == 0){
273
if (ret == 0){
352
274
/* EOF */
353
275
break;
354
276
}
378
300
return plaintext_length;
379
301
}
380
302
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)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
385
306
ret = "(unknown)";
386
307
return ret;
387
308
}
392
313
fprintf(stderr, "GnuTLS: %s", string);
393
314
}
394
315
395
static int init_gnutls_global(const char *pubkeyfilename,
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
396
318
const char *seckeyfilename){
397
319
int ret;
398
320
401
323
}
402
324
403
325
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
407
329
return -1;
408
330
}
409
331
410
if(debug){
332
if (debug){
411
333
/* "Use a log level over 10 to enable all debugging options."
412
334
* - GnuTLS manual
413
335
*/
416
338
}
417
339
418
340
/* 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();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
427
347
return -1;
428
348
}
429
349
434
354
}
435
355
436
356
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
438
358
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
440
360
fprintf(stderr,
441
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
446
366
}
447
367
448
368
/* 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));
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
453
373
goto globalfail;
454
374
}
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));
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
459
379
goto globalfail;
460
380
}
461
381
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
463
383
464
384
return 0;
465
385
466
386
globalfail:
467
387
468
gnutls_certificate_free_credentials(mc.cred);
388
gnutls_certificate_free_credentials(mc->cred);
469
389
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
390
return -1;
472
391
}
473
392
474
static int init_gnutls_session(gnutls_session_t *session){
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
475
395
int ret;
476
396
/* GnuTLS session creation */
477
397
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
398
if (ret != GNUTLS_E_SUCCESS){
479
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
400
safer_gnutls_strerror(ret));
481
401
}
482
402
483
403
{
484
404
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
487
407
fprintf(stderr, "Syntax error at: %s\n", err);
488
408
fprintf(stderr, "GnuTLS error: %s\n",
489
409
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
410
gnutls_deinit (*session);
491
411
return -1;
492
412
}
493
413
}
494
414
495
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
498
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
419
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
420
gnutls_deinit (*session);
501
421
return -1;
502
422
}
503
423
504
424
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
507
427
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
429
510
430
return 0;
511
431
}
517
437
/* Called when a Mandos server is found */
518
438
static int start_mandos_communication(const char *ip, uint16_t port,
519
439
AvahiIfIndex if_index,
520
int af){
440
mandos_context *mc){
521
441
int ret, tcp_sd;
522
ssize_t sret;
523
union {
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
526
} to;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
527
443
char *buffer = NULL;
528
444
char *decrypted_buffer;
529
445
size_t buffer_length = 0;
531
447
ssize_t decrypted_buffer_size;
532
448
size_t written;
533
449
int retval = 0;
450
char interface[IF_NAMESIZE];
534
451
gnutls_session_t session;
535
int pf; /* Protocol family */
536
537
switch(af){
538
case AF_INET6:
539
pf = PF_INET6;
540
break;
541
case AF_INET:
542
pf = PF_INET;
543
break;
544
default:
545
fprintf(stderr, "Bad address family: %d\n", af);
546
return -1;
547
}
548
549
ret = init_gnutls_session(&session);
550
if(ret != 0){
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
551
455
return -1;
552
456
}
553
457
554
458
if(debug){
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
556
460
"\n", ip, port);
557
461
}
558
462
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
560
if(tcp_sd < 0){
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
if(tcp_sd < 0) {
561
465
perror("socket");
562
466
return -1;
563
467
}
564
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
472
return -1;
473
}
474
fprintf(stderr, "Binding to interface %s\n", interface);
475
}
476
565
477
memset(&to, 0, sizeof(to));
566
if(af == AF_INET6){
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
569
} else { /* IPv4 */
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
572
}
573
if(ret < 0 ){
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
574
483
perror("inet_pton");
575
484
return -1;
576
485
}
578
487
fprintf(stderr, "Bad address: %s\n", ip);
579
488
return -1;
580
489
}
581
if(af == AF_INET6){
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
583
-Wconversion and
584
-Wunreachable-code */
585
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
588
-Wunreachable-code*/
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
592
return -1;
593
}
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
596
}
597
} else {
598
to.in.sin_port = htons(port); /* Spurious warnings from
599
-Wconversion and
600
-Wunreachable-code */
601
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
491
492
to.in6.sin6_scope_id = (uint32_t)if_index;
602
493
603
494
if(debug){
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
608
} else {
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
611
}
612
} else {
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
port);
615
}
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
const char *pcret;
619
if(af == AF_INET6){
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
sizeof(addrstr));
622
} else {
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
624
sizeof(addrstr));
625
}
626
if(pcret == NULL){
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
627
500
perror("inet_ntop");
628
501
} else {
629
502
if(strcmp(addrstr, ip) != 0){
632
505
}
633
506
}
634
507
635
if(af == AF_INET6){
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
637
} else {
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
639
}
640
if(ret < 0){
508
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
641
510
perror("connect");
642
511
return -1;
643
512
}
644
513
645
514
const char *out = mandos_protocol_version;
646
515
written = 0;
647
while(true){
516
while (true){
648
517
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
519
out_size - written));
651
if(ret == -1){
520
if (ret == -1){
652
521
perror("write");
653
522
retval = -1;
654
523
goto mandos_end;
657
526
if(written < out_size){
658
527
continue;
659
528
} else {
660
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
661
530
written = 0;
662
531
out = "\r\n";
663
532
} else {
670
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
671
540
}
672
541
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
674
543
675
544
do{
676
ret = gnutls_handshake(session);
545
ret = gnutls_handshake (session);
677
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
678
547
679
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
680
549
if(debug){
681
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
682
gnutls_perror(ret);
551
gnutls_perror (ret);
683
552
}
684
553
retval = -1;
685
554
goto mandos_end;
688
557
/* Read OpenPGP packet that contains the wanted password */
689
558
690
559
if(debug){
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
561
ip);
693
562
}
694
563
695
564
while(true){
696
buffer_capacity = incbuffer(&buffer, buffer_length,
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
697
566
buffer_capacity);
698
if(buffer_capacity == 0){
699
perror("incbuffer");
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
700
569
retval = -1;
701
570
goto mandos_end;
702
571
}
703
572
704
sret = gnutls_record_recv(session, buffer+buffer_length,
705
BUFFER_SIZE);
706
if(sret == 0){
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
707
576
break;
708
577
}
709
if(sret < 0){
710
switch(sret){
578
if (ret < 0){
579
switch(ret){
711
580
case GNUTLS_E_INTERRUPTED:
712
581
case GNUTLS_E_AGAIN:
713
582
break;
714
583
case GNUTLS_E_REHANDSHAKE:
715
584
do{
716
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
717
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
718
if(ret < 0){
587
if (ret < 0){
719
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
720
gnutls_perror(ret);
589
gnutls_perror (ret);
721
590
retval = -1;
722
591
goto mandos_end;
723
592
}
726
595
fprintf(stderr, "Unknown error while reading data from"
727
596
" encrypted session with Mandos server\n");
728
597
retval = -1;
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
730
599
goto mandos_end;
731
600
}
732
601
} else {
733
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
734
603
}
735
604
}
736
605
738
607
fprintf(stderr, "Closing TLS session\n");
739
608
}
740
609
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
742
611
743
if(buffer_length > 0){
612
if (buffer_length > 0){
744
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
614
buffer_length,
746
&decrypted_buffer);
747
if(decrypted_buffer_size >= 0){
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
748
618
written = 0;
749
619
while(written < (size_t) decrypted_buffer_size){
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
752
stdout);
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
753
623
if(ret == 0 and ferror(stdout)){
754
624
if(debug){
755
625
fprintf(stderr, "Error writing encrypted data: %s\n",
772
642
773
643
mandos_end:
774
644
free(buffer);
775
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
776
if(ret == -1){
777
perror("close");
778
}
779
gnutls_deinit(session);
645
close(tcp_sd);
646
gnutls_deinit (session);
780
647
return retval;
781
648
}
782
649
783
sig_atomic_t quit_now = 0;
784
785
650
static void resolve_callback(AvahiSServiceResolver *r,
786
651
AvahiIfIndex interface,
787
AvahiProtocol proto,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
788
653
AvahiResolverEvent event,
789
654
const char *name,
790
655
const char *type,
795
660
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
662
flags,
798
AVAHI_GCC_UNUSED void* userdata){
663
void* userdata) {
664
mandos_context *mc = userdata;
799
665
assert(r);
800
666
801
667
/* Called whenever a service has been resolved successfully or
802
668
timed out */
803
669
804
if(quit_now){
805
return;
806
}
807
808
switch(event){
670
switch (event) {
809
671
default:
810
672
case AVAHI_RESOLVER_FAILURE:
811
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
812
674
" of type '%s' in domain '%s': %s\n", name, type, domain,
813
avahi_strerror(avahi_server_errno(mc.server)));
675
avahi_strerror(avahi_server_errno(mc->server)));
814
676
break;
815
677
816
678
case AVAHI_RESOLVER_FOUND:
819
681
avahi_address_snprint(ip, sizeof(ip), address);
820
682
if(debug){
821
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
822
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
823
ip, (intmax_t)interface, port);
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
824
686
}
825
int ret = start_mandos_communication(ip, port, interface,
826
avahi_proto_to_af(proto));
827
if(ret == 0){
828
avahi_simple_poll_quit(mc.simple_poll);
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
829
690
}
830
691
}
831
692
}
832
693
avahi_s_service_resolver_free(r);
833
694
}
834
695
835
static void browse_callback(AvahiSServiceBrowser *b,
836
AvahiIfIndex interface,
837
AvahiProtocol protocol,
838
AvahiBrowserEvent event,
839
const char *name,
840
const char *type,
841
const char *domain,
842
AVAHI_GCC_UNUSED AvahiLookupResultFlags
843
flags,
844
AVAHI_GCC_UNUSED void* userdata){
696
static void browse_callback( AvahiSServiceBrowser *b,
697
AvahiIfIndex interface,
698
AvahiProtocol protocol,
699
AvahiBrowserEvent event,
700
const char *name,
701
const char *type,
702
const char *domain,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
704
flags,
705
void* userdata) {
706
mandos_context *mc = userdata;
845
707
assert(b);
846
708
847
709
/* Called whenever a new services becomes available on the LAN or
848
710
is removed from the LAN */
849
711
850
switch(event){
712
switch (event) {
851
713
default:
852
714
case AVAHI_BROWSER_FAILURE:
853
715
854
716
fprintf(stderr, "(Avahi browser) %s\n",
855
avahi_strerror(avahi_server_errno(mc.server)));
856
avahi_simple_poll_quit(mc.simple_poll);
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
857
719
return;
858
720
859
721
case AVAHI_BROWSER_NEW:
862
724
the callback function is called the Avahi server will free the
863
725
resolver for us. */
864
726
865
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
866
name, type, domain, protocol, 0,
867
resolve_callback, NULL) == NULL)
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
868
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
869
name, avahi_strerror(avahi_server_errno(mc.server)));
732
name, avahi_strerror(avahi_server_errno(mc->server)));
870
733
break;
871
734
872
735
case AVAHI_BROWSER_REMOVE:
881
744
}
882
745
}
883
746
884
/* stop main loop after sigterm has been called */
885
static void handle_sigterm(__attribute__((unused)) int sig){
886
if(quit_now){
887
return;
888
}
889
quit_now = 1;
890
int old_errno = errno;
891
if(mc.simple_poll != NULL){
892
avahi_simple_poll_quit(mc.simple_poll);
893
}
894
errno = old_errno;
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
895
756
}
896
757
758
897
759
int main(int argc, char *argv[]){
898
AvahiSServiceBrowser *sb = NULL;
899
int error;
900
int ret;
901
intmax_t tmpmax;
902
char *tmp;
903
int exitcode = EXIT_SUCCESS;
904
const char *interface = "eth0";
905
struct ifreq network;
906
int sd = -1;
907
bool take_down_interface = false;
908
uid_t uid;
909
gid_t gid;
910
char *connect_to = NULL;
911
char tempdir[] = "/tmp/mandosXXXXXX";
912
bool tempdir_created = false;
913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
914
const char *seckey = PATHDIR "/" SECKEY;
915
const char *pubkey = PATHDIR "/" PUBKEY;
916
917
bool gnutls_initialized = false;
918
bool gpgme_initialized = false;
919
float delay = 2.5f;
920
921
struct sigaction old_sigterm_action;
922
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
923
924
{
925
struct argp_option options[] = {
926
{ .name = "debug", .key = 128,
927
.doc = "Debug mode", .group = 3 },
928
{ .name = "connect", .key = 'c',
929
.arg = "ADDRESS:PORT",
930
.doc = "Connect directly to a specific Mandos server",
931
.group = 1 },
932
{ .name = "interface", .key = 'i',
933
.arg = "NAME",
934
.doc = "Network interface that will be used to search for"
935
" Mandos servers",
936
.group = 1 },
937
{ .name = "seckey", .key = 's',
938
.arg = "FILE",
939
.doc = "OpenPGP secret key file base name",
940
.group = 1 },
941
{ .name = "pubkey", .key = 'p',
942
.arg = "FILE",
943
.doc = "OpenPGP public key file base name",
944
.group = 2 },
945
{ .name = "dh-bits", .key = 129,
946
.arg = "BITS",
947
.doc = "Bit length of the prime number used in the"
948
" Diffie-Hellman key exchange",
949
.group = 2 },
950
{ .name = "priority", .key = 130,
951
.arg = "STRING",
952
.doc = "GnuTLS priority string for the TLS handshake",
953
.group = 1 },
954
{ .name = "delay", .key = 131,
955
.arg = "SECONDS",
956
.doc = "Maximum delay to wait for interface startup",
957
.group = 2 },
958
{ .name = NULL }
959
};
960
961
error_t parse_opt(int key, char *arg,
962
struct argp_state *state){
963
switch(key){
964
case 128: /* --debug */
965
debug = true;
966
break;
967
case 'c': /* --connect */
968
connect_to = arg;
969
break;
970
case 'i': /* --interface */
971
interface = arg;
972
break;
973
case 's': /* --seckey */
974
seckey = arg;
975
break;
976
case 'p': /* --pubkey */
977
pubkey = arg;
978
break;
979
case 129: /* --dh-bits */
980
errno = 0;
981
tmpmax = strtoimax(arg, &tmp, 10);
982
if(errno != 0 or tmp == arg or *tmp != '\0'
983
or tmpmax != (typeof(mc.dh_bits))tmpmax){
984
fprintf(stderr, "Bad number of DH bits\n");
985
exit(EXIT_FAILURE);
986
}
987
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
988
break;
989
case 130: /* --priority */
990
mc.priority = arg;
991
break;
992
case 131: /* --delay */
993
errno = 0;
994
delay = strtof(arg, &tmp);
995
if(errno != 0 or tmp == arg or *tmp != '\0'){
996
fprintf(stderr, "Bad delay\n");
997
exit(EXIT_FAILURE);
998
}
999
break;
1000
case ARGP_KEY_ARG:
1001
argp_usage(state);
1002
case ARGP_KEY_END:
1003
break;
1004
default:
1005
return ARGP_ERR_UNKNOWN;
1006
}
1007
return 0;
1008
}
1009
1010
struct argp argp = { .options = options, .parser = parse_opt,
1011
.args_doc = "",
1012
.doc = "Mandos client -- Get and decrypt"
1013
" passwords from a Mandos server" };
1014
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1015
if(ret == ARGP_ERR_UNKNOWN){
1016
fprintf(stderr, "Unknown error while parsing arguments\n");
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
}
1021
1022
if(not debug){
1023
avahi_set_log_function(empty_log);
1024
}
1025
1026
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1027
from the signal handler */
1028
/* Initialize the pseudo-RNG for Avahi */
1029
srand((unsigned int) time(NULL));
1030
mc.simple_poll = avahi_simple_poll_new();
1031
if(mc.simple_poll == NULL){
1032
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1033
exitcode = EXIT_FAILURE;
1034
goto end;
1035
}
1036
1037
sigemptyset(&sigterm_action.sa_mask);
1038
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1039
if(ret == -1){
1040
perror("sigaddset");
1041
exitcode = EXIT_FAILURE;
1042
goto end;
1043
}
1044
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1045
if(ret == -1){
1046
perror("sigaddset");
1047
exitcode = EXIT_FAILURE;
1048
goto end;
1049
}
1050
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1051
if(ret == -1){
1052
perror("sigaddset");
1053
exitcode = EXIT_FAILURE;
1054
goto end;
1055
}
1056
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1057
if(ret == -1){
1058
perror("sigaction");
1059
exitcode = EXIT_FAILURE;
1060
goto end;
1061
}
1062
1063
/* If the interface is down, bring it up */
1064
if(interface[0] != '\0'){
760
AvahiSServiceBrowser *sb = NULL;
761
int error;
762
int ret;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
766
int sd;
767
uid_t uid;
768
gid_t gid;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "ADDRESS:PORT",
786
.doc = "Connect directly to a specific Mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "NAME",
790
.doc = "Interface that will be used to search for Mandos"
791
" servers",
792
.group = 1 },
793
{ .name = "keydir", .key = 'd',
794
.arg = "DIRECTORY",
795
.doc = "Directory to read the OpenPGP key files from",
796
.group = 1 },
797
{ .name = "seckey", .key = 's',
798
.arg = "FILE",
799
.doc = "OpenPGP secret key file base name",
800
.group = 1 },
801
{ .name = "pubkey", .key = 'p',
802
.arg = "FILE",
803
.doc = "OpenPGP public key file base name",
804
.group = 2 },
805
{ .name = "dh-bits", .key = 129,
806
.arg = "BITS",
807
.doc = "Bit length of the prime number used in the"
808
" Diffie-Hellman key exchange",
809
.group = 2 },
810
{ .name = "priority", .key = 130,
811
.arg = "STRING",
812
.doc = "GnuTLS priority string for the TLS handshake",
813
.group = 1 },
814
{ .name = NULL }
815
};
816
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128: /* --debug */
823
debug = true;
824
break;
825
case 'c': /* --connect */
826
connect_to = arg;
827
break;
828
case 'i': /* --interface */
829
interface = arg;
830
break;
831
case 'd': /* --keydir */
832
keydir = arg;
833
break;
834
case 's': /* --seckey */
835
seckeyname = arg;
836
break;
837
case 'p': /* --pubkey */
838
pubkeyname = arg;
839
break;
840
case 129: /* --dh-bits */
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
845
exit(EXIT_FAILURE);
846
}
847
break;
848
case 130: /* --priority */
849
mc.priority = arg;
850
break;
851
case ARGP_KEY_ARG:
852
argp_usage (state);
853
case ARGP_KEY_END:
854
break;
855
default:
856
return ARGP_ERR_UNKNOWN;
857
}
858
return 0;
859
}
860
861
struct argp argp = { .options = options, .parser = parse_opt,
862
.args_doc = "",
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
869
goto end;
870
}
871
}
872
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
877
goto end;
878
}
879
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
884
goto end;
885
}
886
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
if (ret == -1){
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
891
goto end;
892
} else {
893
gnutls_initalized = true;
894
}
895
896
/* If the interface is down, bring it up */
897
{
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
if(sd < 0) {
900
perror("socket");
901
exitcode = EXIT_FAILURE;
902
goto end;
903
}
904
strcpy(network.ifr_name, interface);
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
if(ret == -1){
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
909
goto end;
910
}
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
if(ret == -1){
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
close(sd);
921
}
922
923
uid = getuid();
924
gid = getgid();
925
926
ret = setuid(uid);
927
if (ret == -1){
928
perror("setuid");
929
}
930
931
setgid(gid);
932
if (ret == -1){
933
perror("setgid");
934
}
935
1065
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
1066
937
if(if_index == 0){
1067
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
if(quit_now){
1073
goto end;
1074
}
1075
1076
#ifdef __linux__
1077
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1078
messages to mess up the prompt */
1079
ret = klogctl(8, NULL, 5);
1080
bool restore_loglevel = true;
1081
if(ret == -1){
1082
restore_loglevel = false;
1083
perror("klogctl");
1084
}
1085
#endif /* __linux__ */
1086
1087
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1088
if(sd < 0){
1089
perror("socket");
1090
exitcode = EXIT_FAILURE;
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
goto end;
1100
}
1101
strcpy(network.ifr_name, interface);
1102
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1103
if(ret == -1){
1104
perror("ioctl SIOCGIFFLAGS");
1105
#ifdef __linux__
1106
if(restore_loglevel){
1107
ret = klogctl(7, NULL, 0);
1108
if(ret == -1){
1109
perror("klogctl");
1110
}
1111
}
1112
#endif /* __linux__ */
1113
exitcode = EXIT_FAILURE;
1114
goto end;
1115
}
1116
if((network.ifr_flags & IFF_UP) == 0){
1117
network.ifr_flags |= IFF_UP;
1118
take_down_interface = true;
1119
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1120
if(ret == -1){
1121
take_down_interface = false;
1122
perror("ioctl SIOCSIFFLAGS");
1123
exitcode = EXIT_FAILURE;
1124
#ifdef __linux__
1125
if(restore_loglevel){
1126
ret = klogctl(7, NULL, 0);
1127
if(ret == -1){
1128
perror("klogctl");
1129
}
1130
}
1131
#endif /* __linux__ */
1132
goto end;
1133
}
1134
}
1135
/* sleep checking until interface is running */
1136
for(int i=0; i < delay * 4; i++){
1137
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1138
if(ret == -1){
1139
perror("ioctl SIOCGIFFLAGS");
1140
} else if(network.ifr_flags & IFF_RUNNING){
1141
break;
1142
}
1143
struct timespec sleeptime = { .tv_nsec = 250000000 };
1144
ret = nanosleep(&sleeptime, NULL);
1145
if(ret == -1 and errno != EINTR){
1146
perror("nanosleep");
1147
}
1148
}
1149
if(not take_down_interface){
1150
/* We won't need the socket anymore */
1151
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1152
if(ret == -1){
1153
perror("close");
1154
}
1155
}
1156
#ifdef __linux__
1157
if(restore_loglevel){
1158
/* Restores kernel loglevel to default */
1159
ret = klogctl(7, NULL, 0);
1160
if(ret == -1){
1161
perror("klogctl");
1162
}
1163
}
1164
#endif /* __linux__ */
1165
}
1166
1167
if(quit_now){
1168
goto end;
1169
}
1170
1171
uid = getuid();
1172
gid = getgid();
1173
1174
errno = 0;
1175
setgid(gid);
1176
if(ret == -1){
1177
perror("setgid");
1178
}
1179
1180
ret = setuid(uid);
1181
if(ret == -1){
1182
perror("setuid");
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
ret = init_gnutls_global(pubkey, seckey);
1190
if(ret == -1){
1191
fprintf(stderr, "init_gnutls_global failed\n");
1192
exitcode = EXIT_FAILURE;
1193
goto end;
1194
} else {
1195
gnutls_initialized = true;
1196
}
1197
1198
if(quit_now){
1199
goto end;
1200
}
1201
1202
tempdir_created = true;
1203
if(mkdtemp(tempdir) == NULL){
1204
tempdir_created = false;
1205
perror("mkdtemp");
1206
goto end;
1207
}
1208
1209
if(quit_now){
1210
goto end;
1211
}
1212
1213
if(not init_gpgme(pubkey, seckey, tempdir)){
1214
fprintf(stderr, "init_gpgme failed\n");
1215
exitcode = EXIT_FAILURE;
1216
goto end;
1217
} else {
1218
gpgme_initialized = true;
1219
}
1220
1221
if(quit_now){
1222
goto end;
1223
}
1224
1225
if(connect_to != NULL){
1226
/* Connect directly, do not use Zeroconf */
1227
/* (Mainly meant for debugging) */
1228
char *address = strrchr(connect_to, ':');
1229
if(address == NULL){
1230
fprintf(stderr, "No colon in address\n");
1231
exitcode = EXIT_FAILURE;
1232
goto end;
1233
}
1234
1235
if(quit_now){
1236
goto end;
1237
}
1238
1239
uint16_t port;
1240
errno = 0;
1241
tmpmax = strtoimax(address+1, &tmp, 10);
1242
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1243
or tmpmax != (uint16_t)tmpmax){
1244
fprintf(stderr, "Bad port number\n");
1245
exitcode = EXIT_FAILURE;
1246
goto end;
1247
}
1248
1249
if(quit_now){
1250
goto end;
1251
}
1252
1253
port = (uint16_t)tmpmax;
1254
*address = '\0';
1255
address = connect_to;
1256
/* Colon in address indicates IPv6 */
1257
int af;
1258
if(strchr(address, ':') != NULL){
1259
af = AF_INET6;
1260
} else {
1261
af = AF_INET;
1262
}
1263
1264
if(quit_now){
1265
goto end;
1266
}
1267
1268
ret = start_mandos_communication(address, port, if_index, af);
1269
if(ret < 0){
1270
exitcode = EXIT_FAILURE;
1271
} else {
1272
exitcode = EXIT_SUCCESS;
1273
}
1274
goto end;
1275
}
1276
1277
if(quit_now){
1278
goto end;
1279
}
1280
1281
{
1282
AvahiServerConfig config;
1283
/* Do not publish any local Zeroconf records */
1284
avahi_server_config_init(&config);
1285
config.publish_hinfo = 0;
1286
config.publish_addresses = 0;
1287
config.publish_workstation = 0;
1288
config.publish_domain = 0;
1289
1290
/* Allocate a new server */
1291
mc.server = avahi_server_new(avahi_simple_poll_get
1292
(mc.simple_poll), &config, NULL,
1293
NULL, &error);
1294
1295
/* Free the Avahi configuration data */
1296
avahi_server_config_free(&config);
1297
}
1298
1299
/* Check if creating the Avahi server object succeeded */
1300
if(mc.server == NULL){
1301
fprintf(stderr, "Failed to create Avahi server: %s\n",
1302
avahi_strerror(error));
1303
exitcode = EXIT_FAILURE;
1304
goto end;
1305
}
1306
1307
if(quit_now){
1308
goto end;
1309
}
1310
1311
/* Create the Avahi service browser */
1312
sb = avahi_s_service_browser_new(mc.server, if_index,
1313
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1314
NULL, 0, browse_callback, NULL);
1315
if(sb == NULL){
1316
fprintf(stderr, "Failed to create service browser: %s\n",
1317
avahi_strerror(avahi_server_errno(mc.server)));
1318
exitcode = EXIT_FAILURE;
1319
goto end;
1320
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
/* Run the main loop */
1327
1328
if(debug){
1329
fprintf(stderr, "Starting Avahi loop search\n");
1330
}
1331
1332
avahi_simple_poll_loop(mc.simple_poll);
1333
939
exit(EXIT_FAILURE);
940
}
941
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
946
if(address == NULL){
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
errno = 0;
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
953
if(errno){
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
*address = '\0';
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
961
if(ret < 0){
962
exitcode = EXIT_FAILURE;
963
} else {
964
exitcode = EXIT_SUCCESS;
965
}
966
goto end;
967
}
968
969
if (not debug){
970
avahi_set_log_function(empty_log);
971
}
972
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
975
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
980
" object.\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
}
984
985
{
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
993
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
997
NULL, &error);
998
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1001
}
1002
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1008
goto end;
1009
}
1010
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1013
AVAHI_PROTO_INET6,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1016
if (sb == NULL) {
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1020
goto end;
1021
}
1022
1023
/* Run the main loop */
1024
1025
if (debug){
1026
fprintf(stderr, "Starting Avahi loop search\n");
1027
}
1028
1029
avahi_simple_poll_loop(mc.simple_poll);
1030
1334
1031
end:
1335
1336
if(debug){
1337
fprintf(stderr, "%s exiting\n", argv[0]);
1338
}
1339
1340
/* Cleanup things */
1341
if(sb != NULL)
1342
avahi_s_service_browser_free(sb);
1343
1344
if(mc.server != NULL)
1345
avahi_server_free(mc.server);
1346
1347
if(mc.simple_poll != NULL)
1348
avahi_simple_poll_free(mc.simple_poll);
1349
1350
if(gnutls_initialized){
1351
gnutls_certificate_free_credentials(mc.cred);
1352
gnutls_global_deinit();
1353
gnutls_dh_params_deinit(mc.dh_params);
1354
}
1355
1356
if(gpgme_initialized){
1357
gpgme_release(mc.ctx);
1358
}
1359
1360
/* Take down the network interface */
1361
if(take_down_interface){
1362
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1363
if(ret == -1){
1364
perror("ioctl SIOCGIFFLAGS");
1365
} else if(network.ifr_flags & IFF_UP) {
1366
network.ifr_flags &= ~IFF_UP; /* clear flag */
1367
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1368
if(ret == -1){
1369
perror("ioctl SIOCSIFFLAGS");
1370
}
1371
}
1372
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1373
if(ret == -1){
1374
perror("close");
1375
}
1376
}
1377
1378
/* Removes the temp directory used by GPGME */
1379
if(tempdir_created){
1380
DIR *d;
1381
struct dirent *direntry;
1382
d = opendir(tempdir);
1383
if(d == NULL){
1384
if(errno != ENOENT){
1385
perror("opendir");
1386
}
1387
} else {
1388
while(true){
1389
direntry = readdir(d);
1390
if(direntry == NULL){
1391
break;
1392
}
1393
/* Skip "." and ".." */
1394
if(direntry->d_name[0] == '.'
1395
and (direntry->d_name[1] == '\0'
1396
or (direntry->d_name[1] == '.'
1397
and direntry->d_name[2] == '\0'))){
1398
continue;
1399
}
1400
char *fullname = NULL;
1401
ret = asprintf(&fullname, "%s/%s", tempdir,
1402
direntry->d_name);
1403
if(ret < 0){
1404
perror("asprintf");
1405
continue;
1406
}
1407
ret = remove(fullname);
1408
if(ret == -1){
1409
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1410
strerror(errno));
1411
}
1412
free(fullname);
1413
}
1414
closedir(d);
1415
}
1416
ret = rmdir(tempdir);
1417
if(ret == -1 and errno != ENOENT){
1418
perror("rmdir");
1419
}
1420
}
1421
1422
return exitcode;
1032
1033
if (debug){
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1035
}
1036
1037
/* Cleanup things */
1038
if (sb != NULL)
1039
avahi_s_service_browser_free(sb);
1040
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1043
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1046
free(pubkeyfilename);
1047
free(seckeyfilename);
1048
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();
1052
}
1053
1054
return exitcode;
1423
1055
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0