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237.2.9
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: plugins.d/mandos-client.c
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- Committer: Teddy Hogeborn
- Date: 2009-01-04 21:54:55 UTC
- mto: (24.1.120 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 238.
- Revision ID: teddy@fukt.bsnet.se-20090104215455-o5q1zdrlxzr1wmn1
* README: Update copyright year; add "2009".
* debian/copyright: - '' -
* mandos: - '' -
* mandos-clients.conf.xml: - '' -
* mandos-keygen: - '' -
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.c: - '' -
* plugin-runner.xml: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/askpass-fifo.xml: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugins.d/splashy.c: - '' -
* plugins.d/splashy.xml: - '' -
* plugins.d/usplash.c: - '' -
* plugins.d/usplash.xml: - '' -
* debian/copyright: - '' -
* mandos: - '' -
* mandos-clients.conf.xml: - '' -
* mandos-keygen: - '' -
* mandos-keygen.xml: - '' -
* mandos.conf.xml: - '' -
* mandos.xml: - '' -
* plugin-runner.c: - '' -
* plugin-runner.xml: - '' -
* plugins.d/askpass-fifo.c: - '' -
* plugins.d/askpass-fifo.xml: - '' -
* plugins.d/mandos-client.c: - '' -
* plugins.d/mandos-client.xml: - '' -
* plugins.d/password-prompt.c: - '' -
* plugins.d/password-prompt.xml: - '' -
* plugins.d/splashy.c: - '' -
* plugins.d/splashy.xml: - '' -
* plugins.d/usplash.c: - '' -
* plugins.d/usplash.xml: - '' -
- files added:
- debian/mandos-client.config
- files removed:
- DBUS-API
- debian/source
- files renamed:
- mandos-ctl => mandos-list
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror() */
44
40
#include <stdint.h> /* uint16_t, uint32_t */
45
41
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
42
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
srand() */
44
#include <stdbool.h> /* bool, true */
49
45
#include <string.h> /* memset(), strcmp(), strlen(),
50
46
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/ioctl.h> /* ioctl */
52
48
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
49
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
50
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
56
52
#include <sys/stat.h> /* open() */
57
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
54
struct in6_addr, inet_pton(),
55
connect() */
59
56
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
64
59
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
60
#include <errno.h> /* perror(), errno */
61
#include <time.h> /* time() */
68
62
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
63
SIOCSIFFLAGS, if_indextoname(),
70
64
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
65
#include <netinet/in.h>
74
66
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
67
getuid(), getgid(), setuid(),
68
setgid() */
69
#include <arpa/inet.h> /* inet_pton(), htons */
70
#include <iso646.h> /* not, and */
79
71
#include <argp.h> /* struct argp_option, error_t, struct
80
72
argp_state, struct argp,
81
73
argp_parse(), ARGP_KEY_ARG,
82
74
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__ */
92
75
93
76
/* Avahi */
94
77
/* All Avahi types, constants and functions
107
90
gnutls_*
108
91
init_gnutls_session(),
109
92
GNUTLS_* */
110
#include <gnutls/openpgp.h>
111
/* gnutls_certificate_set_openpgp_key_file(),
93
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
112
94
GNUTLS_OPENPGP_FMT_BASE64 */
113
95
114
96
/* GPGME */
128
110
static const char mandos_protocol_version[] = "1";
129
111
const char *argp_program_version = "mandos-client " VERSION;
130
112
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;
144
113
145
114
/* Used for passing in values through the Avahi callback functions */
146
115
typedef struct {
151
120
gnutls_dh_params_t dh_params;
152
121
const char *priority;
153
122
gpgme_ctx_t ctx;
154
server *current_server;
155
123
} mandos_context;
156
124
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
173
125
/*
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
126
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
127
* "buffer_capacity" is how much is currently allocated,
176
128
* "buffer_length" is how much is already used.
177
129
*/
178
size_t incbuffer(char **buffer, size_t buffer_length,
130
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
131
size_t buffer_capacity){
180
if(buffer_length + BUFFER_SIZE > buffer_capacity){
132
if (buffer_length + BUFFER_SIZE > buffer_capacity){
181
133
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
182
if(buffer == NULL){
134
if (buffer == NULL){
183
135
return 0;
184
136
}
185
137
buffer_capacity += BUFFER_SIZE;
187
139
return buffer_capacity;
188
140
}
189
141
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
227
142
/*
228
143
* Initialize GPGME.
229
144
*/
230
static bool init_gpgme(const char *seckey,
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
231
146
const char *pubkey, const char *tempdir){
147
int ret;
232
148
gpgme_error_t rc;
233
149
gpgme_engine_info_t engine_info;
234
150
235
151
236
152
/*
237
* Helper function to insert pub and seckey to the engine keyring.
153
* Helper function to insert pub and seckey to the enigne keyring.
238
154
*/
239
155
bool import_key(const char *filename){
240
int ret;
241
156
int fd;
242
157
gpgme_data_t pgp_data;
243
158
244
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
245
160
if(fd == -1){
246
perror_plus("open");
161
perror("open");
247
162
return false;
248
163
}
249
164
250
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
251
if(rc != GPG_ERR_NO_ERROR){
166
if (rc != GPG_ERR_NO_ERROR){
252
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
253
168
gpgme_strsource(rc), gpgme_strerror(rc));
254
169
return false;
255
170
}
256
171
257
rc = gpgme_op_import(mc.ctx, pgp_data);
258
if(rc != GPG_ERR_NO_ERROR){
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
259
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
175
gpgme_strsource(rc), gpgme_strerror(rc));
261
176
return false;
262
177
}
263
178
264
ret = (int)TEMP_FAILURE_RETRY(close(fd));
179
ret = TEMP_FAILURE_RETRY(close(fd));
265
180
if(ret == -1){
266
perror_plus("close");
181
perror("close");
267
182
}
268
183
gpgme_data_release(pgp_data);
269
184
return true;
270
185
}
271
186
272
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
187
if (debug){
188
fprintf(stderr, "Initialize gpgme\n");
274
189
}
275
190
276
191
/* Init GPGME */
277
192
gpgme_check_version(NULL);
278
193
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
279
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
280
195
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
281
196
gpgme_strsource(rc), gpgme_strerror(rc));
282
197
return false;
283
198
}
284
199
285
200
/* Set GPGME home directory for the OpenPGP engine only */
286
rc = gpgme_get_engine_info(&engine_info);
287
if(rc != GPG_ERR_NO_ERROR){
201
rc = gpgme_get_engine_info (&engine_info);
202
if (rc != GPG_ERR_NO_ERROR){
288
203
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
289
204
gpgme_strsource(rc), gpgme_strerror(rc));
290
205
return false;
303
218
}
304
219
305
220
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
307
if(rc != GPG_ERR_NO_ERROR){
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
308
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
224
gpgme_strsource(rc), gpgme_strerror(rc));
310
225
return false;
311
226
}
312
227
313
if(not import_key(pubkey) or not import_key(seckey)){
228
if (not import_key(pubkey) or not import_key(seckey)){
314
229
return false;
315
230
}
316
231
317
return true;
232
return true;
318
233
}
319
234
320
235
/*
321
236
* Decrypt OpenPGP data.
322
237
* Returns -1 on error
323
238
*/
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
325
size_t crypto_size,
326
char **plaintext){
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
241
size_t crypto_size,
242
char **plaintext){
327
243
gpgme_data_t dh_crypto, dh_plain;
328
244
gpgme_error_t rc;
329
245
ssize_t ret;
330
246
size_t plaintext_capacity = 0;
331
247
ssize_t plaintext_length = 0;
332
248
333
if(debug){
249
if (debug){
334
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
335
251
}
336
252
337
253
/* Create new GPGME data buffer from memory cryptotext */
338
254
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
339
255
0);
340
if(rc != GPG_ERR_NO_ERROR){
256
if (rc != GPG_ERR_NO_ERROR){
341
257
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
258
gpgme_strsource(rc), gpgme_strerror(rc));
343
259
return -1;
345
261
346
262
/* Create new empty GPGME data buffer for the plaintext */
347
263
rc = gpgme_data_new(&dh_plain);
348
if(rc != GPG_ERR_NO_ERROR){
264
if (rc != GPG_ERR_NO_ERROR){
349
265
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
266
gpgme_strsource(rc), gpgme_strerror(rc));
351
267
gpgme_data_release(dh_crypto);
354
270
355
271
/* Decrypt data from the cryptotext data buffer to the plaintext
356
272
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
358
if(rc != GPG_ERR_NO_ERROR){
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
274
if (rc != GPG_ERR_NO_ERROR){
359
275
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
276
gpgme_strsource(rc), gpgme_strerror(rc));
361
277
plaintext_length = -1;
362
if(debug){
278
if (debug){
363
279
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
365
if(result == NULL){
280
result = gpgme_op_decrypt_result(mc->ctx);
281
if (result == NULL){
366
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
367
283
} else {
368
284
fprintf(stderr, "Unsupported algorithm: %s\n",
374
290
}
375
291
gpgme_recipient_t recipient;
376
292
recipient = result->recipients;
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;
293
if(recipient){
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
300
? "No" : "Yes");
301
recipient = recipient->next;
302
}
385
303
}
386
304
}
387
305
}
393
311
}
394
312
395
313
/* Seek back to the beginning of the GPGME plaintext data buffer */
396
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
397
perror_plus("gpgme_data_seek");
314
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
398
316
plaintext_length = -1;
399
317
goto decrypt_end;
400
318
}
401
319
402
320
*plaintext = NULL;
403
321
while(true){
404
plaintext_capacity = incbuffer(plaintext,
322
plaintext_capacity = adjustbuffer(plaintext,
405
323
(size_t)plaintext_length,
406
324
plaintext_capacity);
407
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
325
if (plaintext_capacity == 0){
326
perror("adjustbuffer");
409
327
plaintext_length = -1;
410
328
goto decrypt_end;
411
329
}
413
331
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
414
332
BUFFER_SIZE);
415
333
/* Print the data, if any */
416
if(ret == 0){
334
if (ret == 0){
417
335
/* EOF */
418
336
break;
419
337
}
420
338
if(ret < 0){
421
perror_plus("gpgme_data_read");
339
perror("gpgme_data_read");
422
340
plaintext_length = -1;
423
341
goto decrypt_end;
424
342
}
443
361
return plaintext_length;
444
362
}
445
363
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)
364
static const char * safer_gnutls_strerror (int value) {
365
const char *ret = gnutls_strerror (value); /* Spurious warning */
366
if (ret == NULL)
450
367
ret = "(unknown)";
451
368
return ret;
452
369
}
457
374
fprintf(stderr, "GnuTLS: %s", string);
458
375
}
459
376
460
static int init_gnutls_global(const char *pubkeyfilename,
377
static int init_gnutls_global(mandos_context *mc,
378
const char *pubkeyfilename,
461
379
const char *seckeyfilename){
462
380
int ret;
463
381
466
384
}
467
385
468
386
ret = gnutls_global_init();
469
if(ret != GNUTLS_E_SUCCESS){
470
fprintf(stderr, "GnuTLS global_init: %s\n",
471
safer_gnutls_strerror(ret));
387
if (ret != GNUTLS_E_SUCCESS) {
388
fprintf (stderr, "GnuTLS global_init: %s\n",
389
safer_gnutls_strerror(ret));
472
390
return -1;
473
391
}
474
392
475
if(debug){
393
if (debug){
476
394
/* "Use a log level over 10 to enable all debugging options."
477
395
* - GnuTLS manual
478
396
*/
481
399
}
482
400
483
401
/* OpenPGP credentials */
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();
402
gnutls_certificate_allocate_credentials(&mc->cred);
403
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
405
warning */
406
safer_gnutls_strerror(ret));
407
gnutls_global_deinit ();
489
408
return -1;
490
409
}
491
410
496
415
}
497
416
498
417
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
418
(mc->cred, pubkeyfilename, seckeyfilename,
500
419
GNUTLS_OPENPGP_FMT_BASE64);
501
if(ret != GNUTLS_E_SUCCESS){
420
if (ret != GNUTLS_E_SUCCESS) {
502
421
fprintf(stderr,
503
422
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
423
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
508
427
}
509
428
510
429
/* GnuTLS server initialization */
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));
430
ret = gnutls_dh_params_init(&mc->dh_params);
431
if (ret != GNUTLS_E_SUCCESS) {
432
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
433
" %s\n", safer_gnutls_strerror(ret));
515
434
goto globalfail;
516
435
}
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));
436
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
437
if (ret != GNUTLS_E_SUCCESS) {
438
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
439
safer_gnutls_strerror(ret));
521
440
goto globalfail;
522
441
}
523
442
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
443
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
444
526
445
return 0;
527
446
528
447
globalfail:
529
448
530
gnutls_certificate_free_credentials(mc.cred);
449
gnutls_certificate_free_credentials(mc->cred);
531
450
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
451
gnutls_dh_params_deinit(mc->dh_params);
533
452
return -1;
534
453
}
535
454
536
static int init_gnutls_session(gnutls_session_t *session){
455
static int init_gnutls_session(mandos_context *mc,
456
gnutls_session_t *session){
537
457
int ret;
538
458
/* GnuTLS session creation */
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){
459
ret = gnutls_init(session, GNUTLS_SERVER);
460
if (ret != GNUTLS_E_SUCCESS){
546
461
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
462
safer_gnutls_strerror(ret));
548
463
}
549
464
550
465
{
551
466
const char *err;
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){
467
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
468
if (ret != GNUTLS_E_SUCCESS) {
560
469
fprintf(stderr, "Syntax error at: %s\n", err);
561
470
fprintf(stderr, "GnuTLS error: %s\n",
562
471
safer_gnutls_strerror(ret));
563
gnutls_deinit(*session);
472
gnutls_deinit (*session);
564
473
return -1;
565
474
}
566
475
}
567
476
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){
477
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
478
mc->cred);
479
if (ret != GNUTLS_E_SUCCESS) {
577
480
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
481
safer_gnutls_strerror(ret));
579
gnutls_deinit(*session);
482
gnutls_deinit (*session);
580
483
return -1;
581
484
}
582
485
583
486
/* ignore client certificate if any. */
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
487
gnutls_certificate_server_set_request (*session,
488
GNUTLS_CERT_IGNORE);
585
489
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
490
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
587
491
588
492
return 0;
589
493
}
595
499
/* Called when a Mandos server is found */
596
500
static int start_mandos_communication(const char *ip, uint16_t port,
597
501
AvahiIfIndex if_index,
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;
502
mandos_context *mc){
503
int ret, tcp_sd;
504
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
605
505
char *buffer = NULL;
606
char *decrypted_buffer = NULL;
506
char *decrypted_buffer;
607
507
size_t buffer_length = 0;
608
508
size_t buffer_capacity = 0;
509
ssize_t decrypted_buffer_size;
609
510
size_t written;
610
int retval = -1;
511
int retval = 0;
512
char interface[IF_NAMESIZE];
611
513
gnutls_session_t session;
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){
514
515
ret = init_gnutls_session (mc, &session);
516
if (ret != 0){
636
517
return -1;
637
518
}
638
519
639
520
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
521
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
641
522
"\n", ip, port);
642
523
}
643
524
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;
525
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
526
if(tcp_sd < 0) {
527
perror("socket");
528
return -1;
650
529
}
651
530
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
531
if(debug){
532
if(if_indextoname((unsigned int)if_index, interface) == NULL){
533
perror("if_indextoname");
534
return -1;
535
}
536
fprintf(stderr, "Binding to interface %s\n", interface);
655
537
}
656
538
657
539
memset(&to, 0, sizeof(to));
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;
540
to.in6.sin6_family = AF_INET6;
541
/* It would be nice to have a way to detect if we were passed an
542
IPv4 address here. Now we assume an IPv6 address. */
543
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
544
if (ret < 0 ){
545
perror("inet_pton");
546
return -1;
670
547
}
671
548
if(ret == 0){
672
int e = errno;
673
549
fprintf(stderr, "Bad address: %s\n", ip);
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
}
550
return -1;
551
}
552
to.in6.sin6_port = htons(port); /* Spurious warning */
699
553
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
554
to.in6.sin6_scope_id = (uint32_t)if_index;
704
555
705
556
if(debug){
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");
557
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
558
port);
559
char addrstr[INET6_ADDRSTRLEN] = "";
560
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
561
sizeof(addrstr)) == NULL){
562
perror("inet_ntop");
730
563
} else {
731
564
if(strcmp(addrstr, ip) != 0){
732
565
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
567
}
735
568
}
736
569
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;
570
ret = connect(tcp_sd, &to.in, sizeof(to));
571
if (ret < 0){
572
perror("connect");
573
return -1;
759
574
}
760
575
761
576
const char *out = mandos_protocol_version;
762
577
written = 0;
763
while(true){
578
while (true){
764
579
size_t out_size = strlen(out);
765
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
580
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
581
out_size - written));
767
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
582
if (ret == -1){
583
perror("write");
584
retval = -1;
771
585
goto mandos_end;
772
586
}
773
587
written += (size_t)ret;
774
588
if(written < out_size){
775
589
continue;
776
590
} else {
777
if(out == mandos_protocol_version){
591
if (out == mandos_protocol_version){
778
592
written = 0;
779
593
out = "\r\n";
780
594
} else {
781
595
break;
782
596
}
783
597
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
789
598
}
790
599
791
600
if(debug){
792
601
fprintf(stderr, "Establishing TLS session with %s\n", ip);
793
602
}
794
603
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
}
604
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
605
606
do{
607
ret = gnutls_handshake (session);
814
608
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
815
609
816
if(ret != GNUTLS_E_SUCCESS){
610
if (ret != GNUTLS_E_SUCCESS){
817
611
if(debug){
818
612
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
819
gnutls_perror(ret);
613
gnutls_perror (ret);
820
614
}
821
errno = EPROTO;
615
retval = -1;
822
616
goto mandos_end;
823
617
}
824
618
825
619
/* Read OpenPGP packet that contains the wanted password */
826
620
827
621
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
622
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
829
623
ip);
830
624
}
831
625
832
626
while(true){
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
627
buffer_capacity = adjustbuffer(&buffer, buffer_length,
840
628
buffer_capacity);
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){
629
if (buffer_capacity == 0){
630
perror("adjustbuffer");
631
retval = -1;
632
goto mandos_end;
633
}
634
635
ret = gnutls_record_recv(session, buffer+buffer_length,
636
BUFFER_SIZE);
637
if (ret == 0){
856
638
break;
857
639
}
858
if(sret < 0){
859
switch(sret){
640
if (ret < 0){
641
switch(ret){
860
642
case GNUTLS_E_INTERRUPTED:
861
643
case GNUTLS_E_AGAIN:
862
644
break;
863
645
case GNUTLS_E_REHANDSHAKE:
864
do {
865
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
646
do{
647
ret = gnutls_handshake (session);
871
648
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
if(ret < 0){
649
if (ret < 0){
873
650
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
874
gnutls_perror(ret);
875
errno = EPROTO;
651
gnutls_perror (ret);
652
retval = -1;
876
653
goto mandos_end;
877
654
}
878
655
break;
879
656
default:
880
657
fprintf(stderr, "Unknown error while reading data from"
881
658
" encrypted session with Mandos server\n");
882
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
659
retval = -1;
660
gnutls_bye (session, GNUTLS_SHUT_RDWR);
884
661
goto mandos_end;
885
662
}
886
663
} else {
887
buffer_length += (size_t) sret;
664
buffer_length += (size_t) ret;
888
665
}
889
666
}
890
667
892
669
fprintf(stderr, "Closing TLS session\n");
893
670
}
894
671
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,
672
gnutls_bye (session, GNUTLS_SHUT_RDWR);
673
674
if (buffer_length > 0){
675
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
911
676
buffer_length,
912
677
&decrypted_buffer);
913
if(decrypted_buffer_size >= 0){
914
678
if (decrypted_buffer_size >= 0){
915
679
written = 0;
916
680
while(written < (size_t) decrypted_buffer_size){
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);
681
ret = (int)fwrite (decrypted_buffer + written, 1,
682
(size_t)decrypted_buffer_size - written,
683
stdout);
925
684
if(ret == 0 and ferror(stdout)){
926
int e = errno;
927
685
if(debug){
928
686
fprintf(stderr, "Error writing encrypted data: %s\n",
929
687
strerror(errno));
930
688
}
931
errno = e;
932
goto mandos_end;
689
retval = -1;
690
break;
933
691
}
934
692
written += (size_t)ret;
935
693
}
936
retval = 0;
694
free(decrypted_buffer);
695
} else {
696
retval = -1;
937
697
}
698
} else {
699
retval = -1;
938
700
}
939
701
940
702
/* Shutdown procedure */
941
703
942
704
mandos_end:
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
}
705
free(buffer);
706
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
707
if(ret == -1){
708
perror("close");
962
709
}
710
gnutls_deinit (session);
963
711
return retval;
964
712
}
965
713
966
714
static void resolve_callback(AvahiSServiceResolver *r,
967
715
AvahiIfIndex interface,
968
AvahiProtocol proto,
716
AVAHI_GCC_UNUSED AvahiProtocol protocol,
969
717
AvahiResolverEvent event,
970
718
const char *name,
971
719
const char *type,
976
724
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
725
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
726
flags,
979
AVAHI_GCC_UNUSED void* userdata){
727
void* userdata) {
728
mandos_context *mc = userdata;
980
729
assert(r);
981
730
982
731
/* Called whenever a service has been resolved successfully or
983
732
timed out */
984
733
985
if(quit_now){
986
return;
987
}
988
989
switch(event){
734
switch (event) {
990
735
default:
991
736
case AVAHI_RESOLVER_FAILURE:
992
737
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
738
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
739
avahi_strerror(avahi_server_errno(mc->server)));
995
740
break;
996
741
997
742
case AVAHI_RESOLVER_FOUND:
1000
745
avahi_address_snprint(ip, sizeof(ip), address);
1001
746
if(debug){
1002
747
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
748
PRIu16 ") on port %d\n", name, host_name, ip,
749
interface, port);
1005
750
}
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));
751
int ret = start_mandos_communication(ip, port, interface, mc);
752
if (ret == 0){
753
avahi_simple_poll_quit(mc->simple_poll);
1013
754
}
1014
755
}
1015
756
}
1016
757
avahi_s_service_resolver_free(r);
1017
758
}
1018
759
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){
760
static void browse_callback( AvahiSServiceBrowser *b,
761
AvahiIfIndex interface,
762
AvahiProtocol protocol,
763
AvahiBrowserEvent event,
764
const char *name,
765
const char *type,
766
const char *domain,
767
AVAHI_GCC_UNUSED AvahiLookupResultFlags
768
flags,
769
void* userdata) {
770
mandos_context *mc = userdata;
1029
771
assert(b);
1030
772
1031
773
/* Called whenever a new services becomes available on the LAN or
1032
774
is removed from the LAN */
1033
775
1034
if(quit_now){
1035
return;
1036
}
1037
1038
switch(event){
776
switch (event) {
1039
777
default:
1040
778
case AVAHI_BROWSER_FAILURE:
1041
779
1042
780
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
781
avahi_strerror(avahi_server_errno(mc->server)));
782
avahi_simple_poll_quit(mc->simple_poll);
1045
783
return;
1046
784
1047
785
case AVAHI_BROWSER_NEW:
1050
788
the callback function is called the Avahi server will free the
1051
789
resolver for us. */
1052
790
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
791
if (!(avahi_s_service_resolver_new(mc->server, interface,
792
protocol, name, type, domain,
793
AVAHI_PROTO_INET6, 0,
794
resolve_callback, mc)))
1056
795
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
796
name, avahi_strerror(avahi_server_errno(mc->server)));
1058
797
break;
1059
798
1060
799
case AVAHI_BROWSER_REMOVE:
1069
808
}
1070
809
}
1071
810
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
1274
811
int main(int argc, char *argv[]){
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
if(not debug){
1460
avahi_set_log_function(empty_log);
1461
}
1462
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1466
alphasort);
1467
if(ret >= 1){
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1470
if(debug){
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1472
}
1473
if(interface == NULL){
1474
perror_plus("malloc");
1475
free(direntries);
1476
exitcode = EXIT_FAILURE;
1477
goto end;
1478
}
1479
free(direntries);
1480
} else {
1481
free(direntries);
1482
fprintf(stderr, "Could not find a network interface\n");
1483
exitcode = EXIT_FAILURE;
1484
goto end;
1485
}
1486
}
1487
1488
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1489
from the signal handler */
1490
/* Initialize the pseudo-RNG for Avahi */
1491
srand((unsigned int) time(NULL));
1492
mc.simple_poll = avahi_simple_poll_new();
1493
if(mc.simple_poll == NULL){
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1495
exitcode = EX_UNAVAILABLE;
1496
goto end;
1497
}
1498
1499
sigemptyset(&sigterm_action.sa_mask);
1500
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1501
if(ret == -1){
1502
perror_plus("sigaddset");
1503
exitcode = EX_OSERR;
1504
goto end;
1505
}
1506
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1507
if(ret == -1){
1508
perror_plus("sigaddset");
1509
exitcode = EX_OSERR;
1510
goto end;
1511
}
1512
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1513
if(ret == -1){
1514
perror_plus("sigaddset");
1515
exitcode = EX_OSERR;
1516
goto end;
1517
}
1518
/* Need to check if the handler is SIG_IGN before handling:
1519
| [[info:libc:Initial Signal Actions]] |
1520
| [[info:libc:Basic Signal Handling]] |
1521
*/
1522
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1523
if(ret == -1){
1524
perror_plus("sigaction");
1525
return EX_OSERR;
1526
}
1527
if(old_sigterm_action.sa_handler != SIG_IGN){
1528
ret = sigaction(SIGINT, &sigterm_action, NULL);
1529
if(ret == -1){
1530
perror_plus("sigaction");
1531
exitcode = EX_OSERR;
1532
goto end;
1533
}
1534
}
1535
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1536
if(ret == -1){
1537
perror_plus("sigaction");
1538
return EX_OSERR;
1539
}
1540
if(old_sigterm_action.sa_handler != SIG_IGN){
1541
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1542
if(ret == -1){
1543
perror_plus("sigaction");
1544
exitcode = EX_OSERR;
1545
goto end;
1546
}
1547
}
1548
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1549
if(ret == -1){
1550
perror_plus("sigaction");
1551
return EX_OSERR;
1552
}
1553
if(old_sigterm_action.sa_handler != SIG_IGN){
1554
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1555
if(ret == -1){
1556
perror_plus("sigaction");
1557
exitcode = EX_OSERR;
1558
goto end;
1559
}
1560
}
1561
1562
/* If the interface is down, bring it up */
1563
if(strcmp(interface, "none") != 0){
812
AvahiSServiceBrowser *sb = NULL;
813
int error;
814
int ret;
815
int exitcode = EXIT_SUCCESS;
816
const char *interface = "eth0";
817
struct ifreq network;
818
int sd;
819
uid_t uid;
820
gid_t gid;
821
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
826
827
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
832
833
{
834
struct argp_option options[] = {
835
{ .name = "debug", .key = 128,
836
.doc = "Debug mode", .group = 3 },
837
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
840
.group = 1 },
841
{ .name = "interface", .key = 'i',
842
.arg = "NAME",
843
.doc = "Interface that will be used to search for Mandos"
844
" servers",
845
.group = 1 },
846
{ .name = "seckey", .key = 's',
847
.arg = "FILE",
848
.doc = "OpenPGP secret key file base name",
849
.group = 1 },
850
{ .name = "pubkey", .key = 'p',
851
.arg = "FILE",
852
.doc = "OpenPGP public key file base name",
853
.group = 2 },
854
{ .name = "dh-bits", .key = 129,
855
.arg = "BITS",
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
858
.group = 2 },
859
{ .name = "priority", .key = 130,
860
.arg = "STRING",
861
.doc = "GnuTLS priority string for the TLS handshake",
862
.group = 1 },
863
{ .name = NULL }
864
};
865
866
error_t parse_opt (int key, char *arg,
867
struct argp_state *state) {
868
/* Get the INPUT argument from `argp_parse', which we know is
869
a pointer to our plugin list pointer. */
870
switch (key) {
871
case 128: /* --debug */
872
debug = true;
873
break;
874
case 'c': /* --connect */
875
connect_to = arg;
876
break;
877
case 'i': /* --interface */
878
interface = arg;
879
break;
880
case 's': /* --seckey */
881
seckey = arg;
882
break;
883
case 'p': /* --pubkey */
884
pubkey = arg;
885
break;
886
case 129: /* --dh-bits */
887
errno = 0;
888
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
889
if (errno){
890
perror("strtol");
891
exit(EXIT_FAILURE);
892
}
893
break;
894
case 130: /* --priority */
895
mc.priority = arg;
896
break;
897
case ARGP_KEY_ARG:
898
argp_usage (state);
899
case ARGP_KEY_END:
900
break;
901
default:
902
return ARGP_ERR_UNKNOWN;
903
}
904
return 0;
905
}
906
907
struct argp argp = { .options = options, .parser = parse_opt,
908
.args_doc = "",
909
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
911
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
if (ret == ARGP_ERR_UNKNOWN){
913
fprintf(stderr, "Unknown error while parsing arguments\n");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
919
/* If the interface is down, bring it up */
920
{
921
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
922
if(sd < 0) {
923
perror("socket");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
}
927
strcpy(network.ifr_name, interface);
928
ret = ioctl(sd, SIOCGIFFLAGS, &network);
929
if(ret == -1){
930
perror("ioctl SIOCGIFFLAGS");
931
exitcode = EXIT_FAILURE;
932
goto end;
933
}
934
if((network.ifr_flags & IFF_UP) == 0){
935
network.ifr_flags |= IFF_UP;
936
ret = ioctl(sd, SIOCSIFFLAGS, &network);
937
if(ret == -1){
938
perror("ioctl SIOCSIFFLAGS");
939
exitcode = EXIT_FAILURE;
940
goto end;
941
}
942
}
943
ret = TEMP_FAILURE_RETRY(close(sd));
944
if(ret == -1){
945
perror("close");
946
}
947
}
948
949
uid = getuid();
950
gid = getgid();
951
952
ret = setuid(uid);
953
if (ret == -1){
954
perror("setuid");
955
}
956
957
setgid(gid);
958
if (ret == -1){
959
perror("setgid");
960
}
961
962
ret = init_gnutls_global(&mc, pubkey, seckey);
963
if (ret == -1){
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
966
goto end;
967
} else {
968
gnutls_initalized = true;
969
}
970
971
if(mkdtemp(tempdir) == NULL){
972
perror("mkdtemp");
973
tempdir[0] = '\0';
974
goto end;
975
}
976
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
} else {
982
gpgme_initalized = true;
983
}
984
1564
985
if_index = (AvahiIfIndex) if_nametoindex(interface);
1565
986
if(if_index == 0){
1566
987
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1568
goto end;
1569
}
1570
1571
if(quit_now){
1572
goto end;
1573
}
1574
1575
/* Re-raise priviliges */
1576
errno = 0;
1577
ret = seteuid(0);
1578
if(ret == -1){
1579
perror_plus("seteuid");
1580
}
1581
1582
#ifdef __linux__
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1584
messages about the network interface to mess up the prompt */
1585
ret = klogctl(8, NULL, 5);
1586
bool restore_loglevel = true;
1587
if(ret == -1){
1588
restore_loglevel = false;
1589
perror_plus("klogctl");
1590
}
1591
#endif /* __linux__ */
1592
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1594
if(sd < 0){
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1597
#ifdef __linux__
1598
if(restore_loglevel){
1599
ret = klogctl(7, NULL, 0);
1600
if(ret == -1){
1601
perror_plus("klogctl");
1602
}
1603
}
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1606
errno = 0;
1607
ret = seteuid(uid);
1608
if(ret == -1){
1609
perror_plus("seteuid");
1610
}
1611
goto end;
1612
}
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1615
if(ret == -1){
1616
perror_plus("ioctl SIOCGIFFLAGS");
1617
#ifdef __linux__
1618
if(restore_loglevel){
1619
ret = klogctl(7, NULL, 0);
1620
if(ret == -1){
1621
perror_plus("klogctl");
1622
}
1623
}
1624
#endif /* __linux__ */
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1627
errno = 0;
1628
ret = seteuid(uid);
1629
if(ret == -1){
1630
perror_plus("seteuid");
1631
}
1632
goto end;
1633
}
1634
if((network.ifr_flags & IFF_UP) == 0){
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1638
if(ret == -1){
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1642
#ifdef __linux__
1643
if(restore_loglevel){
1644
ret = klogctl(7, NULL, 0);
1645
if(ret == -1){
1646
perror_plus("klogctl");
1647
}
1648
}
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1651
errno = 0;
1652
ret = seteuid(uid);
1653
if(ret == -1){
1654
perror_plus("seteuid");
1655
}
1656
goto end;
1657
}
1658
}
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1661
for(int i=0; i < delay * 4; i++){
1662
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1663
if(ret == -1){
1664
perror_plus("ioctl SIOCGIFFLAGS");
1665
} else if(network.ifr_flags & IFF_RUNNING){
1666
break;
1667
}
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1672
}
1673
}
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1677
if(ret == -1){
1678
perror_plus("close");
1679
}
1680
}
1681
#ifdef __linux__
1682
if(restore_loglevel){
1683
/* Restores kernel loglevel to default */
1684
ret = klogctl(7, NULL, 0);
1685
if(ret == -1){
1686
perror_plus("klogctl");
1687
}
1688
}
1689
#endif /* __linux__ */
1690
/* Lower privileges */
1691
errno = 0;
1692
if(take_down_interface){
1693
/* Lower privileges */
1694
ret = seteuid(uid);
1695
if(ret == -1){
1696
perror_plus("seteuid");
1697
}
1698
} else {
1699
/* Lower privileges permanently */
1700
ret = setuid(uid);
1701
if(ret == -1){
1702
perror_plus("setuid");
1703
}
1704
}
1705
}
1706
1707
if(quit_now){
1708
goto end;
1709
}
1710
1711
ret = init_gnutls_global(pubkey, seckey);
1712
if(ret == -1){
1713
fprintf(stderr, "init_gnutls_global failed\n");
1714
exitcode = EX_UNAVAILABLE;
1715
goto end;
1716
} else {
1717
gnutls_initialized = true;
1718
}
1719
1720
if(quit_now){
1721
goto end;
1722
}
1723
1724
if(mkdtemp(tempdir) == NULL){
1725
perror_plus("mkdtemp");
1726
goto end;
1727
}
1728
tempdir_created = true;
1729
1730
if(quit_now){
1731
goto end;
1732
}
1733
1734
if(not init_gpgme(pubkey, seckey, tempdir)){
1735
fprintf(stderr, "init_gpgme failed\n");
1736
exitcode = EX_UNAVAILABLE;
1737
goto end;
1738
} else {
1739
gpgme_initialized = true;
1740
}
1741
1742
if(quit_now){
1743
goto end;
1744
}
1745
1746
if(connect_to != NULL){
1747
/* Connect directly, do not use Zeroconf */
1748
/* (Mainly meant for debugging) */
1749
char *address = strrchr(connect_to, ':');
1750
if(address == NULL){
1751
fprintf(stderr, "No colon in address\n");
1752
exitcode = EX_USAGE;
1753
goto end;
1754
}
1755
1756
if(quit_now){
1757
goto end;
1758
}
1759
1760
uint16_t port;
1761
errno = 0;
1762
tmpmax = strtoimax(address+1, &tmp, 10);
1763
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1764
or tmpmax != (uint16_t)tmpmax){
1765
fprintf(stderr, "Bad port number\n");
1766
exitcode = EX_USAGE;
1767
goto end;
1768
}
1769
1770
if(quit_now){
1771
goto end;
1772
}
1773
1774
port = (uint16_t)tmpmax;
1775
*address = '\0';
1776
address = connect_to;
1777
/* Colon in address indicates IPv6 */
1778
int af;
1779
if(strchr(address, ':') != NULL){
1780
af = AF_INET6;
1781
} else {
1782
af = AF_INET;
1783
}
1784
1785
if(quit_now){
1786
goto end;
1787
}
1788
1789
while(not quit_now){
1790
ret = start_mandos_communication(address, port, if_index, af);
1791
if(quit_now or ret == 0){
1792
break;
1793
}
1794
sleep((int)retry_interval or 1);
1795
};
1796
1797
if (not quit_now){
1798
exitcode = EXIT_SUCCESS;
1799
}
1800
1801
goto end;
1802
}
1803
1804
if(quit_now){
1805
goto end;
1806
}
1807
1808
{
1809
AvahiServerConfig config;
1810
/* Do not publish any local Zeroconf records */
1811
avahi_server_config_init(&config);
1812
config.publish_hinfo = 0;
1813
config.publish_addresses = 0;
1814
config.publish_workstation = 0;
1815
config.publish_domain = 0;
1816
1817
/* Allocate a new server */
1818
mc.server = avahi_server_new(avahi_simple_poll_get
1819
(mc.simple_poll), &config, NULL,
1820
NULL, &error);
1821
1822
/* Free the Avahi configuration data */
1823
avahi_server_config_free(&config);
1824
}
1825
1826
/* Check if creating the Avahi server object succeeded */
1827
if(mc.server == NULL){
1828
fprintf(stderr, "Failed to create Avahi server: %s\n",
1829
avahi_strerror(error));
1830
exitcode = EX_UNAVAILABLE;
1831
goto end;
1832
}
1833
1834
if(quit_now){
1835
goto end;
1836
}
1837
1838
/* Create the Avahi service browser */
1839
sb = avahi_s_service_browser_new(mc.server, if_index,
1840
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1841
NULL, 0, browse_callback, NULL);
1842
if(sb == NULL){
1843
fprintf(stderr, "Failed to create service browser: %s\n",
1844
avahi_strerror(avahi_server_errno(mc.server)));
1845
exitcode = EX_UNAVAILABLE;
1846
goto end;
1847
}
1848
1849
if(quit_now){
1850
goto end;
1851
}
1852
1853
/* Run the main loop */
1854
1855
if(debug){
1856
fprintf(stderr, "Starting Avahi loop search\n");
1857
}
1858
1859
ret = avahi_loop_with_timeout(mc.simple_poll,
1860
(int)(retry_interval * 1000));
1861
if(debug){
1862
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1863
(ret == 0) ? "successfully" : "with error");
1864
}
1865
988
exit(EXIT_FAILURE);
989
}
990
991
if(connect_to != NULL){
992
/* Connect directly, do not use Zeroconf */
993
/* (Mainly meant for debugging) */
994
char *address = strrchr(connect_to, ':');
995
if(address == NULL){
996
fprintf(stderr, "No colon in address\n");
997
exitcode = EXIT_FAILURE;
998
goto end;
999
}
1000
errno = 0;
1001
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1002
if(errno){
1003
perror("Bad port number");
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
*address = '\0';
1008
address = connect_to;
1009
ret = start_mandos_communication(address, port, if_index, &mc);
1010
if(ret < 0){
1011
exitcode = EXIT_FAILURE;
1012
} else {
1013
exitcode = EXIT_SUCCESS;
1014
}
1015
goto end;
1016
}
1017
1018
if (not debug){
1019
avahi_set_log_function(empty_log);
1020
}
1021
1022
/* Initialize the pseudo-RNG for Avahi */
1023
srand((unsigned int) time(NULL));
1024
1025
/* Allocate main Avahi loop object */
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if (mc.simple_poll == NULL) {
1028
fprintf(stderr, "Avahi: Failed to create simple poll"
1029
" object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
{
1035
AvahiServerConfig config;
1036
/* Do not publish any local Zeroconf records */
1037
avahi_server_config_init(&config);
1038
config.publish_hinfo = 0;
1039
config.publish_addresses = 0;
1040
config.publish_workstation = 0;
1041
config.publish_domain = 0;
1042
1043
/* Allocate a new server */
1044
mc.server = avahi_server_new(avahi_simple_poll_get
1045
(mc.simple_poll), &config, NULL,
1046
NULL, &error);
1047
1048
/* Free the Avahi configuration data */
1049
avahi_server_config_free(&config);
1050
}
1051
1052
/* Check if creating the Avahi server object succeeded */
1053
if (mc.server == NULL) {
1054
fprintf(stderr, "Failed to create Avahi server: %s\n",
1055
avahi_strerror(error));
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* Create the Avahi service browser */
1061
sb = avahi_s_service_browser_new(mc.server, if_index,
1062
AVAHI_PROTO_INET6,
1063
"_mandos._tcp", NULL, 0,
1064
browse_callback, &mc);
1065
if (sb == NULL) {
1066
fprintf(stderr, "Failed to create service browser: %s\n",
1067
avahi_strerror(avahi_server_errno(mc.server)));
1068
exitcode = EXIT_FAILURE;
1069
goto end;
1070
}
1071
1072
/* Run the main loop */
1073
1074
if (debug){
1075
fprintf(stderr, "Starting Avahi loop search\n");
1076
}
1077
1078
avahi_simple_poll_loop(mc.simple_poll);
1079
1866
1080
end:
1867
1868
if(debug){
1869
fprintf(stderr, "%s exiting\n", argv[0]);
1870
}
1871
1872
/* Cleanup things */
1873
if(sb != NULL)
1874
avahi_s_service_browser_free(sb);
1875
1876
if(mc.server != NULL)
1877
avahi_server_free(mc.server);
1878
1879
if(mc.simple_poll != NULL)
1880
avahi_simple_poll_free(mc.simple_poll);
1881
1882
if(gnutls_initialized){
1883
gnutls_certificate_free_credentials(mc.cred);
1884
gnutls_global_deinit();
1885
gnutls_dh_params_deinit(mc.dh_params);
1886
}
1887
1888
if(gpgme_initialized){
1889
gpgme_release(mc.ctx);
1890
}
1891
1892
/* Cleans up the circular linked list of Mandos servers the client
1893
has seen */
1894
if(mc.current_server != NULL){
1895
mc.current_server->prev->next = NULL;
1896
while(mc.current_server != NULL){
1897
server *next = mc.current_server->next;
1898
free(mc.current_server);
1899
mc.current_server = next;
1900
}
1901
}
1902
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1906
errno = 0;
1907
ret = seteuid(0);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
if(geteuid() == 0){
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1913
if(ret == -1){
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1920
}
1921
}
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1923
if(ret == -1){
1924
perror_plus("close");
1925
}
1926
/* Lower privileges permanently */
1927
errno = 0;
1928
ret = setuid(uid);
1929
if(ret == -1){
1930
perror_plus("setuid");
1931
}
1932
}
1933
}
1934
1935
/* Removes the GPGME temp directory and all files inside */
1936
if(tempdir_created){
1937
struct dirent **direntries = NULL;
1938
struct dirent *direntry = NULL;
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1940
if (ret > 0){
1941
for(int i = 0; i < ret; i++){
1942
direntry = direntries[i];
1943
char *fullname = NULL;
1944
ret = asprintf(&fullname, "%s/%s", tempdir,
1945
direntry->d_name);
1946
if(ret < 0){
1947
perror_plus("asprintf");
1948
continue;
1949
}
1950
ret = remove(fullname);
1951
if(ret == -1){
1952
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1953
strerror(errno));
1954
}
1955
free(fullname);
1956
}
1957
}
1958
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1960
specify */
1961
free(direntries);
1962
if (ret == -1){
1963
perror_plus("scandir");
1964
}
1965
ret = rmdir(tempdir);
1966
if(ret == -1 and errno != ENOENT){
1967
perror_plus("rmdir");
1968
}
1969
}
1970
1971
if(quit_now){
1972
sigemptyset(&old_sigterm_action.sa_mask);
1973
old_sigterm_action.sa_handler = SIG_DFL;
1974
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1975
&old_sigterm_action,
1976
NULL));
1977
if(ret == -1){
1978
perror_plus("sigaction");
1979
}
1980
do {
1981
ret = raise(signal_received);
1982
} while(ret != 0 and errno == EINTR);
1983
if(ret != 0){
1984
perror_plus("raise");
1985
abort();
1986
}
1987
TEMP_FAILURE_RETRY(pause());
1988
}
1989
1990
return exitcode;
1081
1082
if (debug){
1083
fprintf(stderr, "%s exiting\n", argv[0]);
1084
}
1085
1086
/* Cleanup things */
1087
if (sb != NULL)
1088
avahi_s_service_browser_free(sb);
1089
1090
if (mc.server != NULL)
1091
avahi_server_free(mc.server);
1092
1093
if (mc.simple_poll != NULL)
1094
avahi_simple_poll_free(mc.simple_poll);
1095
1096
if (gnutls_initalized){
1097
gnutls_certificate_free_credentials(mc.cred);
1098
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1100
}
1101
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1104
}
1105
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1108
DIR *d;
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1111
if(d == NULL){
1112
perror("opendir");
1113
} else {
1114
while(true){
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1117
break;
1118
}
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1122
direntry->d_name);
1123
if(ret < 0){
1124
perror("asprintf");
1125
continue;
1126
}
1127
ret = unlink(fullname);
1128
if(ret == -1){
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1131
}
1132
free(fullname);
1133
}
1134
}
1135
closedir(d);
1136
}
1137
ret = rmdir(tempdir);
1138
if(ret == -1){
1139
perror("rmdir");
1140
}
1141
}
1142
1143
return exitcode;
1991
1144
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0