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- Committer: Björn Påhlsson
- Date: 2011-07-25 18:47:45 UTC
- mto: This revision was merged to the branch mainline in revision 489.
- Revision ID: belorn@fukt.bsnet.se-20110725184745-leavsoyu1hll3mdp
free dirents in password-prompt
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 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
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
srand() */
43
#include <stdbool.h> /* bool, true */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
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
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
61
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
69
SIOCSIFFLAGS, if_indextoname(),
63
70
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
getuid(), getgid(), setuid(),
67
setgid() */
68
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
79
#include <argp.h> /* struct argp_option, error_t, struct
71
80
argp_state, struct argp,
72
81
argp_parse(), ARGP_KEY_ARG,
73
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
#ifdef __linux__
90
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
74
92
75
93
/* Avahi */
76
94
/* All Avahi types, constants and functions
89
107
gnutls_*
90
108
init_gnutls_session(),
91
109
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
93
112
GNUTLS_OPENPGP_FMT_BASE64 */
94
113
95
114
/* GPGME */
101
120
102
121
#define BUFFER_SIZE 256
103
122
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
123
#define PATHDIR "/conf/conf.d/mandos"
109
124
#define SECKEY "seckey.txt"
110
125
#define PUBKEY "pubkey.txt"
111
126
112
127
bool debug = false;
113
128
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
129
const char *argp_program_version = "mandos-client " VERSION;
115
130
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
116
144
117
145
/* Used for passing in values through the Avahi callback functions */
118
146
typedef struct {
123
151
gnutls_dh_params_t dh_params;
124
152
const char *priority;
125
153
gpgme_ctx_t ctx;
154
server *current_server;
126
155
} mandos_context;
127
156
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
128
173
/*
129
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
130
* "buffer_capacity" is how much is currently allocated,
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
131
176
* "buffer_length" is how much is already used.
132
177
*/
133
size_t adjustbuffer(char **buffer, size_t buffer_length,
178
size_t incbuffer(char **buffer, size_t buffer_length,
134
179
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
182
if(buffer == NULL){
138
183
return 0;
139
184
}
140
185
buffer_capacity += BUFFER_SIZE;
142
187
return buffer_capacity;
143
188
}
144
189
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
193
int ret;
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
197
return -1;
198
}
199
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
213
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
225
}
226
145
227
/*
146
228
* Initialize GPGME.
147
229
*/
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
230
static bool init_gpgme(const char *seckey,
149
231
const char *pubkey, const char *tempdir){
150
int ret;
151
232
gpgme_error_t rc;
152
233
gpgme_engine_info_t engine_info;
153
234
154
235
155
236
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
237
* Helper function to insert pub and seckey to the engine keyring.
157
238
*/
158
239
bool import_key(const char *filename){
240
int ret;
159
241
int fd;
160
242
gpgme_data_t pgp_data;
161
243
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
244
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
245
if(fd == -1){
164
perror("open");
246
perror_plus("open");
165
247
return false;
166
248
}
167
249
168
250
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
251
if(rc != GPG_ERR_NO_ERROR){
170
252
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
253
gpgme_strsource(rc), gpgme_strerror(rc));
172
254
return false;
173
255
}
174
256
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
257
rc = gpgme_op_import(mc.ctx, pgp_data);
258
if(rc != GPG_ERR_NO_ERROR){
177
259
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
260
gpgme_strsource(rc), gpgme_strerror(rc));
179
261
return false;
180
262
}
181
263
182
ret = TEMP_FAILURE_RETRY(close(fd));
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
265
if(ret == -1){
184
perror("close");
266
perror_plus("close");
185
267
}
186
268
gpgme_data_release(pgp_data);
187
269
return true;
188
270
}
189
271
190
if (debug){
191
fprintf(stderr, "Initialize gpgme\n");
272
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
192
274
}
193
275
194
276
/* Init GPGME */
195
277
gpgme_check_version(NULL);
196
278
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
279
if(rc != GPG_ERR_NO_ERROR){
198
280
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
281
gpgme_strsource(rc), gpgme_strerror(rc));
200
282
return false;
201
283
}
202
284
203
285
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
286
rc = gpgme_get_engine_info(&engine_info);
287
if(rc != GPG_ERR_NO_ERROR){
206
288
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
289
gpgme_strsource(rc), gpgme_strerror(rc));
208
290
return false;
221
303
}
222
304
223
305
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
306
rc = gpgme_new(&(mc.ctx));
307
if(rc != GPG_ERR_NO_ERROR){
226
308
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
309
gpgme_strsource(rc), gpgme_strerror(rc));
228
310
return false;
229
311
}
230
312
231
if (not import_key(pubkey) or not import_key(seckey)){
313
if(not import_key(pubkey) or not import_key(seckey)){
232
314
return false;
233
315
}
234
316
235
return true;
317
return true;
236
318
}
237
319
238
320
/*
239
321
* Decrypt OpenPGP data.
240
322
* Returns -1 on error
241
323
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
size_t crypto_size,
326
char **plaintext){
246
327
gpgme_data_t dh_crypto, dh_plain;
247
328
gpgme_error_t rc;
248
329
ssize_t ret;
249
330
size_t plaintext_capacity = 0;
250
331
ssize_t plaintext_length = 0;
251
332
252
if (debug){
333
if(debug){
253
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
335
}
255
336
256
337
/* Create new GPGME data buffer from memory cryptotext */
257
338
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
339
0);
259
if (rc != GPG_ERR_NO_ERROR){
340
if(rc != GPG_ERR_NO_ERROR){
260
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
342
gpgme_strsource(rc), gpgme_strerror(rc));
262
343
return -1;
264
345
265
346
/* Create new empty GPGME data buffer for the plaintext */
266
347
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
348
if(rc != GPG_ERR_NO_ERROR){
268
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
350
gpgme_strsource(rc), gpgme_strerror(rc));
270
351
gpgme_data_release(dh_crypto);
273
354
274
355
/* Decrypt data from the cryptotext data buffer to the plaintext
275
356
data buffer */
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
358
if(rc != GPG_ERR_NO_ERROR){
278
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
360
gpgme_strsource(rc), gpgme_strerror(rc));
280
361
plaintext_length = -1;
281
if (debug){
362
if(debug){
282
363
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
364
result = gpgme_op_decrypt_result(mc.ctx);
365
if(result == NULL){
285
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
367
} else {
287
368
fprintf(stderr, "Unsupported algorithm: %s\n",
293
374
}
294
375
gpgme_recipient_t recipient;
295
376
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
}
377
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
384
recipient = recipient->next;
306
385
}
307
386
}
308
387
}
314
393
}
315
394
316
395
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
396
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
397
perror_plus("gpgme_data_seek");
319
398
plaintext_length = -1;
320
399
goto decrypt_end;
321
400
}
322
401
323
402
*plaintext = NULL;
324
403
while(true){
325
plaintext_capacity = adjustbuffer(plaintext,
404
plaintext_capacity = incbuffer(plaintext,
326
405
(size_t)plaintext_length,
327
406
plaintext_capacity);
328
if (plaintext_capacity == 0){
329
perror("adjustbuffer");
407
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
330
409
plaintext_length = -1;
331
410
goto decrypt_end;
332
411
}
334
413
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
414
BUFFER_SIZE);
336
415
/* Print the data, if any */
337
if (ret == 0){
416
if(ret == 0){
338
417
/* EOF */
339
418
break;
340
419
}
341
420
if(ret < 0){
342
perror("gpgme_data_read");
421
perror_plus("gpgme_data_read");
343
422
plaintext_length = -1;
344
423
goto decrypt_end;
345
424
}
364
443
return plaintext_length;
365
444
}
366
445
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
if (ret == NULL)
446
static const char * safer_gnutls_strerror(int value){
447
const char *ret = gnutls_strerror(value); /* Spurious warning from
448
-Wunreachable-code */
449
if(ret == NULL)
370
450
ret = "(unknown)";
371
451
return ret;
372
452
}
377
457
fprintf(stderr, "GnuTLS: %s", string);
378
458
}
379
459
380
static int init_gnutls_global(mandos_context *mc,
381
const char *pubkeyfilename,
460
static int init_gnutls_global(const char *pubkeyfilename,
382
461
const char *seckeyfilename){
383
462
int ret;
384
463
387
466
}
388
467
389
468
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
469
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
393
472
return -1;
394
473
}
395
474
396
if (debug){
475
if(debug){
397
476
/* "Use a log level over 10 to enable all debugging options."
398
477
* - GnuTLS manual
399
478
*/
402
481
}
403
482
404
483
/* 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 ();
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
485
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_global_deinit();
411
489
return -1;
412
490
}
413
491
418
496
}
419
497
420
498
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
499
(mc.cred, pubkeyfilename, seckeyfilename,
422
500
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
501
if(ret != GNUTLS_E_SUCCESS){
424
502
fprintf(stderr,
425
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
430
508
}
431
509
432
510
/* 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));
511
ret = gnutls_dh_params_init(&mc.dh_params);
512
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
437
515
goto globalfail;
438
516
}
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));
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
518
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
443
521
goto globalfail;
444
522
}
445
523
446
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
447
525
448
526
return 0;
449
527
450
528
globalfail:
451
529
452
gnutls_certificate_free_credentials(mc->cred);
530
gnutls_certificate_free_credentials(mc.cred);
453
531
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
454
533
return -1;
455
534
}
456
535
457
static int init_gnutls_session(mandos_context *mc,
458
gnutls_session_t *session){
536
static int init_gnutls_session(gnutls_session_t *session){
459
537
int ret;
460
538
/* GnuTLS session creation */
461
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
539
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
541
if(quit_now){
542
return -1;
543
}
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
545
if(ret != GNUTLS_E_SUCCESS){
463
546
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
547
safer_gnutls_strerror(ret));
465
548
}
466
549
467
550
{
468
551
const char *err;
469
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
552
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
554
if(quit_now){
555
gnutls_deinit(*session);
556
return -1;
557
}
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
559
if(ret != GNUTLS_E_SUCCESS){
471
560
fprintf(stderr, "Syntax error at: %s\n", err);
472
561
fprintf(stderr, "GnuTLS error: %s\n",
473
562
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
563
gnutls_deinit(*session);
475
564
return -1;
476
565
}
477
566
}
478
567
479
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
568
do {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
571
if(quit_now){
572
gnutls_deinit(*session);
573
return -1;
574
}
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
576
if(ret != GNUTLS_E_SUCCESS){
482
577
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
578
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
579
gnutls_deinit(*session);
485
580
return -1;
486
581
}
487
582
488
583
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
491
585
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
493
587
494
588
return 0;
495
589
}
501
595
/* Called when a Mandos server is found */
502
596
static int start_mandos_communication(const char *ip, uint16_t port,
503
597
AvahiIfIndex if_index,
504
mandos_context *mc){
505
int ret, tcp_sd;
506
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
598
int af){
599
int ret, tcp_sd = -1;
600
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
507
605
char *buffer = NULL;
508
char *decrypted_buffer;
606
char *decrypted_buffer = NULL;
509
607
size_t buffer_length = 0;
510
608
size_t buffer_capacity = 0;
511
ssize_t decrypted_buffer_size;
512
609
size_t written;
513
int retval = 0;
514
char interface[IF_NAMESIZE];
610
int retval = -1;
515
611
gnutls_session_t session;
516
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
612
int pf; /* Protocol family */
613
614
errno = 0;
615
616
if(quit_now){
617
errno = EINTR;
618
return -1;
619
}
620
621
switch(af){
622
case AF_INET6:
623
pf = PF_INET6;
624
break;
625
case AF_INET:
626
pf = PF_INET;
627
break;
628
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
return -1;
632
}
633
634
ret = init_gnutls_session(&session);
635
if(ret != 0){
519
636
return -1;
520
637
}
521
638
522
639
if(debug){
523
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
524
641
"\n", ip, port);
525
642
}
526
643
527
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
528
if(tcp_sd < 0) {
529
perror("socket");
530
return -1;
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
645
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
531
650
}
532
651
533
if(debug){
534
if(if_indextoname((unsigned int)if_index, interface) == NULL){
535
perror("if_indextoname");
536
return -1;
537
}
538
fprintf(stderr, "Binding to interface %s\n", interface);
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
539
655
}
540
656
541
657
memset(&to, 0, sizeof(to));
542
to.in6.sin6_family = AF_INET6;
543
/* It would be nice to have a way to detect if we were passed an
544
IPv4 address here. Now we assume an IPv6 address. */
545
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
547
perror("inet_pton");
548
return -1;
658
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
661
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
664
}
665
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
549
670
}
550
671
if(ret == 0){
672
int e = errno;
551
673
fprintf(stderr, "Bad address: %s\n", ip);
552
return -1;
553
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
674
errno = e;
675
goto mandos_end;
676
}
677
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
685
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
688
errno = EINVAL;
689
goto mandos_end;
690
}
691
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
693
}
694
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
696
-Wconversion and
697
-Wunreachable-code */
698
}
555
699
556
to.in6.sin6_scope_id = (uint32_t)if_index;
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
557
704
558
705
if(debug){
559
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
560
port);
561
char addrstr[INET6_ADDRSTRLEN] = "";
562
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
563
sizeof(addrstr)) == NULL){
564
perror("inet_ntop");
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
char interface[IF_NAMESIZE];
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
710
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
713
}
714
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
717
}
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
565
730
} else {
566
731
if(strcmp(addrstr, ip) != 0){
567
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
569
734
}
570
735
}
571
736
572
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
574
perror("connect");
575
return -1;
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
747
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
576
759
}
577
760
578
761
const char *out = mandos_protocol_version;
579
762
written = 0;
580
while (true){
763
while(true){
581
764
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
766
out_size - written));
584
if (ret == -1){
585
perror("write");
586
retval = -1;
767
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
587
771
goto mandos_end;
588
772
}
589
773
written += (size_t)ret;
590
774
if(written < out_size){
591
775
continue;
592
776
} else {
593
if (out == mandos_protocol_version){
777
if(out == mandos_protocol_version){
594
778
written = 0;
595
779
out = "\r\n";
596
780
} else {
597
781
break;
598
782
}
599
783
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
600
789
}
601
790
602
791
if(debug){
603
792
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
793
}
605
794
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
607
608
do{
609
ret = gnutls_handshake (session);
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warning from -Wint-to-pointer-cast */
801
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
809
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
610
814
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
815
612
if (ret != GNUTLS_E_SUCCESS){
816
if(ret != GNUTLS_E_SUCCESS){
613
817
if(debug){
614
818
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
819
gnutls_perror(ret);
616
820
}
617
retval = -1;
821
errno = EPROTO;
618
822
goto mandos_end;
619
823
}
620
824
621
825
/* Read OpenPGP packet that contains the wanted password */
622
826
623
827
if(debug){
624
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
625
829
ip);
626
830
}
627
831
628
832
while(true){
629
buffer_capacity = adjustbuffer(&buffer, buffer_length,
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
630
840
buffer_capacity);
631
if (buffer_capacity == 0){
632
perror("adjustbuffer");
633
retval = -1;
634
goto mandos_end;
635
}
636
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
841
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
850
goto mandos_end;
851
}
852
853
sret = gnutls_record_recv(session, buffer+buffer_length,
854
BUFFER_SIZE);
855
if(sret == 0){
640
856
break;
641
857
}
642
if (ret < 0){
643
switch(ret){
858
if(sret < 0){
859
switch(sret){
644
860
case GNUTLS_E_INTERRUPTED:
645
861
case GNUTLS_E_AGAIN:
646
862
break;
647
863
case GNUTLS_E_REHANDSHAKE:
648
do{
649
ret = gnutls_handshake (session);
864
do {
865
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
650
871
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
if (ret < 0){
872
if(ret < 0){
652
873
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
654
retval = -1;
874
gnutls_perror(ret);
875
errno = EPROTO;
655
876
goto mandos_end;
656
877
}
657
878
break;
658
879
default:
659
880
fprintf(stderr, "Unknown error while reading data from"
660
881
" encrypted session with Mandos server\n");
661
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
663
884
goto mandos_end;
664
885
}
665
886
} else {
666
buffer_length += (size_t) ret;
887
buffer_length += (size_t) sret;
667
888
}
668
889
}
669
890
671
892
fprintf(stderr, "Closing TLS session\n");
672
893
}
673
894
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
675
676
if (buffer_length > 0){
677
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
900
do {
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
if(quit_now){
903
errno = EINTR;
904
goto mandos_end;
905
}
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
907
908
if(buffer_length > 0){
909
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
678
911
buffer_length,
679
912
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
913
if(decrypted_buffer_size >= 0){
914
681
915
written = 0;
682
916
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
ret = (int)fwrite(decrypted_buffer + written, 1,
923
(size_t)decrypted_buffer_size - written,
924
stdout);
686
925
if(ret == 0 and ferror(stdout)){
926
int e = errno;
687
927
if(debug){
688
928
fprintf(stderr, "Error writing encrypted data: %s\n",
689
929
strerror(errno));
690
930
}
691
retval = -1;
692
break;
931
errno = e;
932
goto mandos_end;
693
933
}
694
934
written += (size_t)ret;
695
935
}
696
free(decrypted_buffer);
697
} else {
698
retval = -1;
936
retval = 0;
699
937
}
700
} else {
701
retval = -1;
702
938
}
703
939
704
940
/* Shutdown procedure */
705
941
706
942
mandos_end:
707
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
709
if(ret == -1){
710
perror("close");
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
711
962
}
712
gnutls_deinit (session);
713
963
return retval;
714
964
}
715
965
716
966
static void resolve_callback(AvahiSServiceResolver *r,
717
967
AvahiIfIndex interface,
718
AVAHI_GCC_UNUSED AvahiProtocol protocol,
968
AvahiProtocol proto,
719
969
AvahiResolverEvent event,
720
970
const char *name,
721
971
const char *type,
726
976
AVAHI_GCC_UNUSED AvahiStringList *txt,
727
977
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
978
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
979
AVAHI_GCC_UNUSED void* userdata){
731
980
assert(r);
732
981
733
982
/* Called whenever a service has been resolved successfully or
734
983
timed out */
735
984
736
switch (event) {
985
if(quit_now){
986
return;
987
}
988
989
switch(event){
737
990
default:
738
991
case AVAHI_RESOLVER_FAILURE:
739
992
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
740
993
" of type '%s' in domain '%s': %s\n", name, type, domain,
741
avahi_strerror(avahi_server_errno(mc->server)));
994
avahi_strerror(avahi_server_errno(mc.server)));
742
995
break;
743
996
744
997
case AVAHI_RESOLVER_FOUND:
747
1000
avahi_address_snprint(ip, sizeof(ip), address);
748
1001
if(debug){
749
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
752
1005
}
753
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
755
avahi_simple_poll_quit(mc->simple_poll);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1008
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
756
1013
}
757
1014
}
758
1015
}
759
1016
avahi_s_service_resolver_free(r);
760
1017
}
761
1018
762
static void browse_callback( AvahiSServiceBrowser *b,
763
AvahiIfIndex interface,
764
AvahiProtocol protocol,
765
AvahiBrowserEvent event,
766
const char *name,
767
const char *type,
768
const char *domain,
769
AVAHI_GCC_UNUSED AvahiLookupResultFlags
770
flags,
771
void* userdata) {
772
mandos_context *mc = userdata;
1019
static void browse_callback(AvahiSServiceBrowser *b,
1020
AvahiIfIndex interface,
1021
AvahiProtocol protocol,
1022
AvahiBrowserEvent event,
1023
const char *name,
1024
const char *type,
1025
const char *domain,
1026
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
773
1029
assert(b);
774
1030
775
1031
/* Called whenever a new services becomes available on the LAN or
776
1032
is removed from the LAN */
777
1033
778
switch (event) {
1034
if(quit_now){
1035
return;
1036
}
1037
1038
switch(event){
779
1039
default:
780
1040
case AVAHI_BROWSER_FAILURE:
781
1041
782
1042
fprintf(stderr, "(Avahi browser) %s\n",
783
avahi_strerror(avahi_server_errno(mc->server)));
784
avahi_simple_poll_quit(mc->simple_poll);
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
785
1045
return;
786
1046
787
1047
case AVAHI_BROWSER_NEW:
790
1050
the callback function is called the Avahi server will free the
791
1051
resolver for us. */
792
1052
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
794
protocol, name, type, domain,
795
AVAHI_PROTO_INET6, 0,
796
resolve_callback, mc)))
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
797
1056
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
798
name, avahi_strerror(avahi_server_errno(mc->server)));
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
799
1058
break;
800
1059
801
1060
case AVAHI_BROWSER_REMOVE:
810
1069
}
811
1070
}
812
1071
1072
/* Signal handler that stops main loop after SIGTERM */
1073
static void handle_sigterm(int sig){
1074
if(quit_now){
1075
return;
1076
}
1077
quit_now = 1;
1078
signal_received = sig;
1079
int old_errno = errno;
1080
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1083
}
1084
errno = old_errno;
1085
}
1086
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1214
}
1215
ret = avahi_simple_poll_iterate(s, -1);
1216
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1220
}
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1223
if(ret == -1){
1224
perror_plus("clock_gettime");
1225
return -1;
1226
}
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1242
}
1243
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1249
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1251
return 0;
1252
}
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1255
if(ret == -1){
1256
perror_plus("clock_gettime");
1257
return -1;
1258
}
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1262
}
1263
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
}
1266
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
1269
}
1270
}
1271
}
1272
}
1273
813
1274
int main(int argc, char *argv[]){
814
AvahiSServiceBrowser *sb = NULL;
815
int error;
816
int ret;
817
int exitcode = EXIT_SUCCESS;
818
const char *interface = "eth0";
819
struct ifreq network;
820
int sd;
821
uid_t uid;
822
gid_t gid;
823
char *connect_to = NULL;
824
char tempdir[] = "/tmp/mandosXXXXXX";
825
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
const char *seckey = PATHDIR "/" SECKEY;
827
const char *pubkey = PATHDIR "/" PUBKEY;
828
829
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
.dh_bits = 1024, .priority = "SECURE256"
831
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
834
835
{
836
struct argp_option options[] = {
837
{ .name = "debug", .key = 128,
838
.doc = "Debug mode", .group = 3 },
839
{ .name = "connect", .key = 'c',
840
.arg = "ADDRESS:PORT",
841
.doc = "Connect directly to a specific Mandos server",
842
.group = 1 },
843
{ .name = "interface", .key = 'i',
844
.arg = "NAME",
845
.doc = "Interface that will be used to search for Mandos"
846
" servers",
847
.group = 1 },
848
{ .name = "seckey", .key = 's',
849
.arg = "FILE",
850
.doc = "OpenPGP secret key file base name",
851
.group = 1 },
852
{ .name = "pubkey", .key = 'p',
853
.arg = "FILE",
854
.doc = "OpenPGP public key file base name",
855
.group = 2 },
856
{ .name = "dh-bits", .key = 129,
857
.arg = "BITS",
858
.doc = "Bit length of the prime number used in the"
859
" Diffie-Hellman key exchange",
860
.group = 2 },
861
{ .name = "priority", .key = 130,
862
.arg = "STRING",
863
.doc = "GnuTLS priority string for the TLS handshake",
864
.group = 1 },
865
{ .name = NULL }
866
};
867
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
873
case 128: /* --debug */
874
debug = true;
875
break;
876
case 'c': /* --connect */
877
connect_to = arg;
878
break;
879
case 'i': /* --interface */
880
interface = arg;
881
break;
882
case 's': /* --seckey */
883
seckey = arg;
884
break;
885
case 'p': /* --pubkey */
886
pubkey = arg;
887
break;
888
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
893
exit(EXIT_FAILURE);
894
}
895
break;
896
case 130: /* --priority */
897
mc.priority = arg;
898
break;
899
case ARGP_KEY_ARG:
900
argp_usage (state);
901
case ARGP_KEY_END:
902
break;
903
default:
904
return ARGP_ERR_UNKNOWN;
905
}
906
return 0;
907
}
908
909
struct argp argp = { .options = options, .parser = parse_opt,
910
.args_doc = "",
911
.doc = "Mandos client -- Get and decrypt"
912
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
915
fprintf(stderr, "Unknown error while parsing arguments\n");
916
exitcode = EXIT_FAILURE;
917
goto end;
918
}
919
}
920
921
/* If the interface is down, bring it up */
922
{
923
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
924
if(sd < 0) {
925
perror("socket");
926
exitcode = EXIT_FAILURE;
927
goto end;
928
}
929
strcpy(network.ifr_name, interface);
930
ret = ioctl(sd, SIOCGIFFLAGS, &network);
931
if(ret == -1){
932
perror("ioctl SIOCGIFFLAGS");
933
exitcode = EXIT_FAILURE;
934
goto end;
935
}
936
if((network.ifr_flags & IFF_UP) == 0){
937
network.ifr_flags |= IFF_UP;
938
ret = ioctl(sd, SIOCSIFFLAGS, &network);
939
if(ret == -1){
940
perror("ioctl SIOCSIFFLAGS");
941
exitcode = EXIT_FAILURE;
942
goto end;
943
}
944
}
945
ret = TEMP_FAILURE_RETRY(close(sd));
946
if(ret == -1){
947
perror("close");
948
}
949
}
950
951
uid = getuid();
952
gid = getgid();
953
954
ret = setuid(uid);
955
if (ret == -1){
956
perror("setuid");
957
}
958
959
setgid(gid);
960
if (ret == -1){
961
perror("setgid");
962
}
963
964
ret = init_gnutls_global(&mc, pubkey, seckey);
965
if (ret == -1){
966
fprintf(stderr, "init_gnutls_global failed\n");
967
exitcode = EXIT_FAILURE;
968
goto end;
969
} else {
970
gnutls_initalized = true;
971
}
972
973
if(mkdtemp(tempdir) == NULL){
974
perror("mkdtemp");
975
tempdir[0] = '\0';
976
goto end;
977
}
978
979
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
980
fprintf(stderr, "pgpme_initalized failed\n");
981
exitcode = EXIT_FAILURE;
982
goto end;
983
} else {
984
pgpme_initalized = true;
985
}
986
1275
AvahiSServiceBrowser *sb = NULL;
1276
int error;
1277
int ret;
1278
intmax_t tmpmax;
1279
char *tmp;
1280
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
1285
uid_t uid;
1286
gid_t gid;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
1289
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
const char *seckey = PATHDIR "/" SECKEY;
1291
const char *pubkey = PATHDIR "/" PUBKEY;
1292
1293
bool gnutls_initialized = false;
1294
bool gpgme_initialized = false;
1295
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1298
1299
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1301
1302
uid = getuid();
1303
gid = getgid();
1304
1305
/* Lower any group privileges we might have, just to be safe */
1306
errno = 0;
1307
ret = setgid(gid);
1308
if(ret == -1){
1309
perror_plus("setgid");
1310
}
1311
1312
/* Lower user privileges (temporarily) */
1313
errno = 0;
1314
ret = seteuid(uid);
1315
if(ret == -1){
1316
perror_plus("seteuid");
1317
}
1318
1319
if(quit_now){
1320
goto end;
1321
}
1322
1323
{
1324
struct argp_option options[] = {
1325
{ .name = "debug", .key = 128,
1326
.doc = "Debug mode", .group = 3 },
1327
{ .name = "connect", .key = 'c',
1328
.arg = "ADDRESS:PORT",
1329
.doc = "Connect directly to a specific Mandos server",
1330
.group = 1 },
1331
{ .name = "interface", .key = 'i',
1332
.arg = "NAME",
1333
.doc = "Network interface that will be used to search for"
1334
" Mandos servers",
1335
.group = 1 },
1336
{ .name = "seckey", .key = 's',
1337
.arg = "FILE",
1338
.doc = "OpenPGP secret key file base name",
1339
.group = 1 },
1340
{ .name = "pubkey", .key = 'p',
1341
.arg = "FILE",
1342
.doc = "OpenPGP public key file base name",
1343
.group = 2 },
1344
{ .name = "dh-bits", .key = 129,
1345
.arg = "BITS",
1346
.doc = "Bit length of the prime number used in the"
1347
" Diffie-Hellman key exchange",
1348
.group = 2 },
1349
{ .name = "priority", .key = 130,
1350
.arg = "STRING",
1351
.doc = "GnuTLS priority string for the TLS handshake",
1352
.group = 1 },
1353
{ .name = "delay", .key = 131,
1354
.arg = "SECONDS",
1355
.doc = "Maximum delay to wait for interface startup",
1356
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1361
/*
1362
* These reproduce what we would get without ARGP_NO_HELP
1363
*/
1364
{ .name = "help", .key = '?',
1365
.doc = "Give this help list", .group = -1 },
1366
{ .name = "usage", .key = -3,
1367
.doc = "Give a short usage message", .group = -1 },
1368
{ .name = "version", .key = 'V',
1369
.doc = "Print program version", .group = -1 },
1370
{ .name = NULL }
1371
};
1372
1373
error_t parse_opt(int key, char *arg,
1374
struct argp_state *state){
1375
errno = 0;
1376
switch(key){
1377
case 128: /* --debug */
1378
debug = true;
1379
break;
1380
case 'c': /* --connect */
1381
connect_to = arg;
1382
break;
1383
case 'i': /* --interface */
1384
interface = arg;
1385
break;
1386
case 's': /* --seckey */
1387
seckey = arg;
1388
break;
1389
case 'p': /* --pubkey */
1390
pubkey = arg;
1391
break;
1392
case 129: /* --dh-bits */
1393
errno = 0;
1394
tmpmax = strtoimax(arg, &tmp, 10);
1395
if(errno != 0 or tmp == arg or *tmp != '\0'
1396
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1397
argp_error(state, "Bad number of DH bits");
1398
}
1399
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1400
break;
1401
case 130: /* --priority */
1402
mc.priority = arg;
1403
break;
1404
case 131: /* --delay */
1405
errno = 0;
1406
delay = strtof(arg, &tmp);
1407
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
argp_error(state, "Bad delay");
1409
}
1410
case 132: /* --retry */
1411
errno = 0;
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
1416
}
1417
break;
1418
/*
1419
* These reproduce what we would get without ARGP_NO_HELP
1420
*/
1421
case '?': /* --help */
1422
argp_state_help(state, state->out_stream,
1423
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1424
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1425
case -3: /* --usage */
1426
argp_state_help(state, state->out_stream,
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1430
exit(argp_err_exit_status);
1431
break;
1432
default:
1433
return ARGP_ERR_UNKNOWN;
1434
}
1435
return errno;
1436
}
1437
1438
struct argp argp = { .options = options, .parser = parse_opt,
1439
.args_doc = "",
1440
.doc = "Mandos client -- Get and decrypt"
1441
" passwords from a Mandos server" };
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
1445
case 0:
1446
break;
1447
case ENOMEM:
1448
default:
1449
errno = ret;
1450
perror_plus("argp_parse");
1451
exitcode = EX_OSERR;
1452
goto end;
1453
case EINVAL:
1454
exitcode = EX_USAGE;
1455
goto end;
1456
}
1457
}
1458
1459
{
1460
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
1513
}
1514
1515
if(not debug){
1516
avahi_set_log_function(empty_log);
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1540
goto end;
1541
}
1542
}
1543
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
from the signal handler */
1546
/* Initialize the pseudo-RNG for Avahi */
1547
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1551
exitcode = EX_UNAVAILABLE;
1552
goto end;
1553
}
1554
1555
sigemptyset(&sigterm_action.sa_mask);
1556
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1557
if(ret == -1){
1558
perror_plus("sigaddset");
1559
exitcode = EX_OSERR;
1560
goto end;
1561
}
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1563
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1566
goto end;
1567
}
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1569
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1572
goto end;
1573
}
1574
/* Need to check if the handler is SIG_IGN before handling:
1575
| [[info:libc:Initial Signal Actions]] |
1576
| [[info:libc:Basic Signal Handling]] |
1577
*/
1578
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1579
if(ret == -1){
1580
perror_plus("sigaction");
1581
return EX_OSERR;
1582
}
1583
if(old_sigterm_action.sa_handler != SIG_IGN){
1584
ret = sigaction(SIGINT, &sigterm_action, NULL);
1585
if(ret == -1){
1586
perror_plus("sigaction");
1587
exitcode = EX_OSERR;
1588
goto end;
1589
}
1590
}
1591
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1592
if(ret == -1){
1593
perror_plus("sigaction");
1594
return EX_OSERR;
1595
}
1596
if(old_sigterm_action.sa_handler != SIG_IGN){
1597
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1598
if(ret == -1){
1599
perror_plus("sigaction");
1600
exitcode = EX_OSERR;
1601
goto end;
1602
}
1603
}
1604
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1605
if(ret == -1){
1606
perror_plus("sigaction");
1607
return EX_OSERR;
1608
}
1609
if(old_sigterm_action.sa_handler != SIG_IGN){
1610
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1611
if(ret == -1){
1612
perror_plus("sigaction");
1613
exitcode = EX_OSERR;
1614
goto end;
1615
}
1616
}
1617
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
987
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
1621
if(if_index == 0){
989
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
991
}
992
993
if(connect_to != NULL){
994
/* Connect directly, do not use Zeroconf */
995
/* (Mainly meant for debugging) */
996
char *address = strrchr(connect_to, ':');
997
if(address == NULL){
998
fprintf(stderr, "No colon in address\n");
999
exitcode = EXIT_FAILURE;
1000
goto end;
1001
}
1002
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
perror("Bad port number");
1006
exitcode = EXIT_FAILURE;
1007
goto end;
1008
}
1009
*address = '\0';
1010
address = connect_to;
1011
ret = start_mandos_communication(address, port, if_index, &mc);
1012
if(ret < 0){
1013
exitcode = EXIT_FAILURE;
1014
} else {
1015
exitcode = EXIT_SUCCESS;
1016
}
1017
goto end;
1018
}
1019
1020
if (not debug){
1021
avahi_set_log_function(empty_log);
1022
}
1023
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
1027
/* Allocate main Avahi loop object */
1028
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1030
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
" object.\n");
1032
exitcode = EXIT_FAILURE;
1033
goto end;
1034
}
1035
1036
{
1037
AvahiServerConfig config;
1038
/* Do not publish any local Zeroconf records */
1039
avahi_server_config_init(&config);
1040
config.publish_hinfo = 0;
1041
config.publish_addresses = 0;
1042
config.publish_workstation = 0;
1043
config.publish_domain = 0;
1044
1045
/* Allocate a new server */
1046
mc.server = avahi_server_new(avahi_simple_poll_get
1047
(mc.simple_poll), &config, NULL,
1048
NULL, &error);
1049
1050
/* Free the Avahi configuration data */
1051
avahi_server_config_free(&config);
1052
}
1053
1054
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1056
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
avahi_strerror(error));
1058
exitcode = EXIT_FAILURE;
1059
goto end;
1060
}
1061
1062
/* Create the Avahi service browser */
1063
sb = avahi_s_service_browser_new(mc.server, if_index,
1064
AVAHI_PROTO_INET6,
1065
"_mandos._tcp", NULL, 0,
1066
browse_callback, &mc);
1067
if (sb == NULL) {
1068
fprintf(stderr, "Failed to create service browser: %s\n",
1069
avahi_strerror(avahi_server_errno(mc.server)));
1070
exitcode = EXIT_FAILURE;
1071
goto end;
1072
}
1073
1074
/* Run the main loop */
1075
1076
if (debug){
1077
fprintf(stderr, "Starting Avahi loop search\n");
1078
}
1079
1080
avahi_simple_poll_loop(mc.simple_poll);
1081
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
1638
#ifdef __linux__
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1646
}
1647
#endif /* __linux__ */
1648
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1653
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
1664
if(ret == -1){
1665
perror_plus("seteuid");
1666
}
1667
goto end;
1668
}
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
1673
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
1685
if(ret == -1){
1686
perror_plus("seteuid");
1687
}
1688
goto end;
1689
}
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1698
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
1709
if(ret == -1){
1710
perror_plus("seteuid");
1711
}
1712
goto end;
1713
}
1714
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1722
break;
1723
}
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1728
}
1729
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1736
}
1737
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
1761
}
1762
1763
if(quit_now){
1764
goto end;
1765
}
1766
1767
ret = init_gnutls_global(pubkey, seckey);
1768
if(ret == -1){
1769
fprintf(stderr, "init_gnutls_global failed\n");
1770
exitcode = EX_UNAVAILABLE;
1771
goto end;
1772
} else {
1773
gnutls_initialized = true;
1774
}
1775
1776
if(quit_now){
1777
goto end;
1778
}
1779
1780
if(mkdtemp(tempdir) == NULL){
1781
perror_plus("mkdtemp");
1782
goto end;
1783
}
1784
tempdir_created = true;
1785
1786
if(quit_now){
1787
goto end;
1788
}
1789
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1791
fprintf(stderr, "init_gpgme failed\n");
1792
exitcode = EX_UNAVAILABLE;
1793
goto end;
1794
} else {
1795
gpgme_initialized = true;
1796
}
1797
1798
if(quit_now){
1799
goto end;
1800
}
1801
1802
if(connect_to != NULL){
1803
/* Connect directly, do not use Zeroconf */
1804
/* (Mainly meant for debugging) */
1805
char *address = strrchr(connect_to, ':');
1806
if(address == NULL){
1807
fprintf(stderr, "No colon in address\n");
1808
exitcode = EX_USAGE;
1809
goto end;
1810
}
1811
1812
if(quit_now){
1813
goto end;
1814
}
1815
1816
uint16_t port;
1817
errno = 0;
1818
tmpmax = strtoimax(address+1, &tmp, 10);
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1821
fprintf(stderr, "Bad port number\n");
1822
exitcode = EX_USAGE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
port = (uint16_t)tmpmax;
1831
*address = '\0';
1832
address = connect_to;
1833
/* Colon in address indicates IPv6 */
1834
int af;
1835
if(strchr(address, ':') != NULL){
1836
af = AF_INET6;
1837
} else {
1838
af = AF_INET;
1839
}
1840
1841
if(quit_now){
1842
goto end;
1843
}
1844
1845
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
1847
if(quit_now or ret == 0){
1848
break;
1849
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
1854
exitcode = EXIT_SUCCESS;
1855
}
1856
1857
goto end;
1858
}
1859
1860
if(quit_now){
1861
goto end;
1862
}
1863
1864
{
1865
AvahiServerConfig config;
1866
/* Do not publish any local Zeroconf records */
1867
avahi_server_config_init(&config);
1868
config.publish_hinfo = 0;
1869
config.publish_addresses = 0;
1870
config.publish_workstation = 0;
1871
config.publish_domain = 0;
1872
1873
/* Allocate a new server */
1874
mc.server = avahi_server_new(avahi_simple_poll_get
1875
(mc.simple_poll), &config, NULL,
1876
NULL, &error);
1877
1878
/* Free the Avahi configuration data */
1879
avahi_server_config_free(&config);
1880
}
1881
1882
/* Check if creating the Avahi server object succeeded */
1883
if(mc.server == NULL){
1884
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
avahi_strerror(error));
1886
exitcode = EX_UNAVAILABLE;
1887
goto end;
1888
}
1889
1890
if(quit_now){
1891
goto end;
1892
}
1893
1894
/* Create the Avahi service browser */
1895
sb = avahi_s_service_browser_new(mc.server, if_index,
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
1898
if(sb == NULL){
1899
fprintf(stderr, "Failed to create service browser: %s\n",
1900
avahi_strerror(avahi_server_errno(mc.server)));
1901
exitcode = EX_UNAVAILABLE;
1902
goto end;
1903
}
1904
1905
if(quit_now){
1906
goto end;
1907
}
1908
1909
/* Run the main loop */
1910
1911
if(debug){
1912
fprintf(stderr, "Starting Avahi loop search\n");
1913
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
1917
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
1920
}
1921
1082
1922
end:
1083
1084
if (debug){
1085
fprintf(stderr, "%s exiting\n", argv[0]);
1086
}
1087
1088
/* Cleanup things */
1089
if (sb != NULL)
1090
avahi_s_service_browser_free(sb);
1091
1092
if (mc.server != NULL)
1093
avahi_server_free(mc.server);
1094
1095
if (mc.simple_poll != NULL)
1096
avahi_simple_poll_free(mc.simple_poll);
1097
1098
if (gnutls_initalized){
1099
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1101
}
1102
1103
if(pgpme_initalized){
1104
gpgme_release(mc.ctx);
1105
}
1106
1107
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1109
DIR *d;
1110
struct dirent *direntry;
1111
d = opendir(tempdir);
1112
if(d == NULL){
1113
perror("opendir");
1114
} else {
1115
while(true){
1116
direntry = readdir(d);
1117
if(direntry == NULL){
1118
break;
1119
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
1135
}
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
1923
1924
if(debug){
1925
fprintf(stderr, "%s exiting\n", argv[0]);
1926
}
1927
1928
/* Cleanup things */
1929
if(sb != NULL)
1930
avahi_s_service_browser_free(sb);
1931
1932
if(mc.server != NULL)
1933
avahi_server_free(mc.server);
1934
1935
if(mc.simple_poll != NULL)
1936
avahi_simple_poll_free(mc.simple_poll);
1937
1938
if(gnutls_initialized){
1939
gnutls_certificate_free_credentials(mc.cred);
1940
gnutls_global_deinit();
1941
gnutls_dh_params_deinit(mc.dh_params);
1942
}
1943
1944
if(gpgme_initialized){
1945
gpgme_release(mc.ctx);
1946
}
1947
1948
/* Cleans up the circular linked list of Mandos servers the client
1949
has seen */
1950
if(mc.current_server != NULL){
1951
mc.current_server->prev->next = NULL;
1952
while(mc.current_server != NULL){
1953
server *next = mc.current_server->next;
1954
free(mc.current_server);
1955
mc.current_server = next;
1956
}
1957
}
1958
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
}
1989
}
1990
1991
/* Removes the GPGME temp directory and all files inside */
1992
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
direntry->d_name);
2002
if(ret < 0){
2003
perror_plus("asprintf");
2004
continue;
2005
}
2006
ret = remove(fullname);
2007
if(ret == -1){
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2009
strerror(errno));
2010
}
2011
free(fullname);
2012
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
2020
}
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2024
}
2025
}
2026
2027
if(quit_now){
2028
sigemptyset(&old_sigterm_action.sa_mask);
2029
old_sigterm_action.sa_handler = SIG_DFL;
2030
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2031
&old_sigterm_action,
2032
NULL));
2033
if(ret == -1){
2034
perror_plus("sigaction");
2035
}
2036
do {
2037
ret = raise(signal_received);
2038
} while(ret != 0 and errno == EINTR);
2039
if(ret != 0){
2040
perror_plus("raise");
2041
abort();
2042
}
2043
TEMP_FAILURE_RETRY(pause());
2044
}
2045
2046
return exitcode;
1144
2047
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0