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- Committer: Teddy Hogeborn
- Date: 2009-11-05 01:59:51 UTC
- Revision ID: teddy@fukt.bsnet.se-20091105015951-r8rm31afqy2qbh8k
* mandos (Client.disable): Rename keyword argument "log" to "quiet",
with inverted sense. All callers changed.
(ClientDBus.disable): Rename keyword argument "signal" to "quiet",
with inverted sense. All callers changed.
(main): Disable D-Bus use if bus name is not available on system bus.
(main.cleanup): Bug fix: Only do "remove_from_connection" on clients
when using D-Bus.
* plugin-runner.c (main): Return EX_OSERR if a bad error happened when
trying to open config file.
with inverted sense. All callers changed.
(ClientDBus.disable): Rename keyword argument "signal" to "quiet",
with inverted sense. All callers changed.
(main): Disable D-Bus use if bus name is not available on system bus.
(main.cleanup): Bug fix: Only do "remove_from_connection" on clients
when using D-Bus.
* plugin-runner.c (main): Return EX_OSERR if a bad error happened when
trying to open config file.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
29
30
*/
30
31
31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
38
#endif
34
39
35
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
41
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#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 */
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
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() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
55
64
#include <assert.h> /* assert() */
56
65
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
66
#include <time.h> /* nanosleep(), time() */
58
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
61
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
74
getuid(), getgid(), seteuid(),
75
setgid(), pause() */
65
76
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
86
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
87
88
#ifdef __linux__
89
#include <sys/klog.h> /* klogctl() */
90
#endif /* __linux__ */
71
91
72
92
/* Avahi */
73
93
/* All Avahi types, constants and functions
86
106
gnutls_*
87
107
init_gnutls_session(),
88
108
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
#include <gnutls/openpgp.h>
110
/* gnutls_certificate_set_openpgp_key_file(),
90
111
GNUTLS_OPENPGP_FMT_BASE64 */
91
112
92
113
/* GPGME */
98
119
99
120
#define BUFFER_SIZE 256
100
121
122
#define PATHDIR "/conf/conf.d/mandos"
123
#define SECKEY "seckey.txt"
124
#define PUBKEY "pubkey.txt"
125
101
126
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
127
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
128
const char *argp_program_version = "mandos-client " VERSION;
105
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
130
107
131
/* Used for passing in values through the Avahi callback functions */
112
136
unsigned int dh_bits;
113
137
gnutls_dh_params_t dh_params;
114
138
const char *priority;
139
gpgme_ctx_t ctx;
115
140
} mandos_context;
116
141
142
/* global context so signal handler can reach it*/
143
mandos_context mc = { .simple_poll = NULL, .server = NULL,
144
.dh_bits = 1024, .priority = "SECURE256"
145
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
147
sig_atomic_t quit_now = 0;
148
int signal_received = 0;
149
117
150
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
151
* Make additional room in "buffer" for at least BUFFER_SIZE more
152
* bytes. "buffer_capacity" is how much is currently allocated,
120
153
* "buffer_length" is how much is already used.
121
154
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
155
size_t incbuffer(char **buffer, size_t buffer_length,
123
156
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
157
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
158
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
159
if(buffer == NULL){
127
160
return 0;
128
161
}
129
162
buffer_capacity += BUFFER_SIZE;
132
165
}
133
166
134
167
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
168
* Initialize GPGME.
137
169
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
144
172
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
173
gpgme_engine_info_t engine_info;
149
174
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
175
176
/*
177
* Helper function to insert pub and seckey to the engine keyring.
178
*/
179
bool import_key(const char *filename){
180
int ret;
181
int fd;
182
gpgme_data_t pgp_data;
183
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
if(fd == -1){
186
perror("open");
187
return false;
188
}
189
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
194
return false;
195
}
196
197
rc = gpgme_op_import(mc.ctx, pgp_data);
198
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
201
return false;
202
}
203
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
205
if(ret == -1){
206
perror("close");
207
}
208
gpgme_data_release(pgp_data);
209
return true;
210
}
211
212
if(debug){
213
fprintf(stderr, "Initializing GPGME\n");
152
214
}
153
215
154
216
/* Init GPGME */
155
217
gpgme_check_version(NULL);
156
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
219
if(rc != GPG_ERR_NO_ERROR){
158
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
221
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
222
return false;
161
223
}
162
224
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
225
/* Set GPGME home directory for the OpenPGP engine only */
226
rc = gpgme_get_engine_info(&engine_info);
227
if(rc != GPG_ERR_NO_ERROR){
166
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
229
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
230
return false;
169
231
}
170
232
while(engine_info != NULL){
171
233
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
234
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
235
engine_info->file_name, tempdir);
174
236
break;
175
237
}
176
238
engine_info = engine_info->next;
177
239
}
178
240
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
242
return false;
243
}
244
245
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
247
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
250
return false;
251
}
252
253
if(not import_key(pubkey) or not import_key(seckey)){
254
return false;
255
}
256
257
return true;
258
}
259
260
/*
261
* Decrypt OpenPGP data.
262
* Returns -1 on error
263
*/
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
265
size_t crypto_size,
266
char **plaintext){
267
gpgme_data_t dh_crypto, dh_plain;
268
gpgme_error_t rc;
269
ssize_t ret;
270
size_t plaintext_capacity = 0;
271
ssize_t plaintext_length = 0;
272
273
if(debug){
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
275
}
182
276
183
277
/* Create new GPGME data buffer from memory cryptotext */
184
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
279
0);
186
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
187
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
282
gpgme_strsource(rc), gpgme_strerror(rc));
189
283
return -1;
191
285
192
286
/* Create new empty GPGME data buffer for the plaintext */
193
287
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
288
if(rc != GPG_ERR_NO_ERROR){
195
289
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
290
gpgme_strsource(rc), gpgme_strerror(rc));
197
291
gpgme_data_release(dh_crypto);
198
292
return -1;
199
293
}
200
294
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
295
/* Decrypt data from the cryptotext data buffer to the plaintext
211
296
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
297
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
298
if(rc != GPG_ERR_NO_ERROR){
214
299
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
300
gpgme_strsource(rc), gpgme_strerror(rc));
216
301
plaintext_length = -1;
217
goto decrypt_end;
218
}
219
220
if(debug){
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
}
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
302
if(debug){
303
gpgme_decrypt_result_t result;
304
result = gpgme_op_decrypt_result(mc.ctx);
305
if(result == NULL){
306
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
307
} else {
308
fprintf(stderr, "Unsupported algorithm: %s\n",
309
result->unsupported_algorithm);
310
fprintf(stderr, "Wrong key usage: %u\n",
311
result->wrong_key_usage);
312
if(result->file_name != NULL){
313
fprintf(stderr, "File name: %s\n", result->file_name);
314
}
315
gpgme_recipient_t recipient;
316
recipient = result->recipients;
240
317
while(recipient != NULL){
241
318
fprintf(stderr, "Public key algorithm: %s\n",
242
319
gpgme_pubkey_algo_name(recipient->pubkey_algo));
248
325
}
249
326
}
250
327
}
328
goto decrypt_end;
329
}
330
331
if(debug){
332
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
251
333
}
252
334
253
335
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
336
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
337
perror("gpgme_data_seek");
256
338
plaintext_length = -1;
257
339
goto decrypt_end;
258
340
}
259
341
260
342
*plaintext = NULL;
261
343
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
344
plaintext_capacity = incbuffer(plaintext,
263
345
(size_t)plaintext_length,
264
346
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
347
if(plaintext_capacity == 0){
348
perror("incbuffer");
267
349
plaintext_length = -1;
268
350
goto decrypt_end;
269
351
}
271
353
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
354
BUFFER_SIZE);
273
355
/* Print the data, if any */
274
if (ret == 0){
356
if(ret == 0){
275
357
/* EOF */
276
358
break;
277
359
}
282
364
}
283
365
plaintext_length += ret;
284
366
}
285
367
286
368
if(debug){
287
369
fprintf(stderr, "Decrypted password is: ");
288
370
for(ssize_t i = 0; i < plaintext_length; i++){
301
383
return plaintext_length;
302
384
}
303
385
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
386
static const char * safer_gnutls_strerror(int value){
387
const char *ret = gnutls_strerror(value); /* Spurious warning from
388
-Wunreachable-code */
389
if(ret == NULL)
307
390
ret = "(unknown)";
308
391
return ret;
309
392
}
314
397
fprintf(stderr, "GnuTLS: %s", string);
315
398
}
316
399
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
400
static int init_gnutls_global(const char *pubkeyfilename,
319
401
const char *seckeyfilename){
320
402
int ret;
321
403
324
406
}
325
407
326
408
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS global_init: %s\n",
411
safer_gnutls_strerror(ret));
330
412
return -1;
331
413
}
332
414
333
if (debug){
415
if(debug){
334
416
/* "Use a log level over 10 to enable all debugging options."
335
417
* - GnuTLS manual
336
418
*/
339
421
}
340
422
341
423
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
345
warning */
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
424
gnutls_certificate_allocate_credentials(&mc.cred);
425
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
427
from
428
-Wunreachable-code
429
*/
430
safer_gnutls_strerror(ret));
431
gnutls_global_deinit();
348
432
return -1;
349
433
}
350
434
351
435
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
354
438
seckeyfilename);
355
439
}
356
440
357
441
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
359
443
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
444
if(ret != GNUTLS_E_SUCCESS){
361
445
fprintf(stderr,
362
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
448
fprintf(stderr, "The GnuTLS error is: %s\n",
365
449
safer_gnutls_strerror(ret));
366
450
goto globalfail;
367
451
}
368
452
369
453
/* GnuTLS server initialization */
370
ret = gnutls_dh_params_init(&mc->dh_params);
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
374
goto globalfail;
375
}
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
380
goto globalfail;
381
}
382
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
384
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
458
goto globalfail;
459
}
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
464
goto globalfail;
465
}
466
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
468
385
469
return 0;
386
470
387
471
globalfail:
388
389
gnutls_certificate_free_credentials(mc->cred);
472
473
gnutls_certificate_free_credentials(mc.cred);
390
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
391
476
return -1;
392
393
477
}
394
478
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
397
480
int ret;
398
481
/* GnuTLS session creation */
399
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
482
do {
483
ret = gnutls_init(session, GNUTLS_SERVER);
484
if(quit_now){
485
return -1;
486
}
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
if(ret != GNUTLS_E_SUCCESS){
401
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
490
safer_gnutls_strerror(ret));
403
491
}
404
492
405
493
{
406
494
const char *err;
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
495
do {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
497
if(quit_now){
498
gnutls_deinit(*session);
499
return -1;
500
}
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
if(ret != GNUTLS_E_SUCCESS){
409
503
fprintf(stderr, "Syntax error at: %s\n", err);
410
504
fprintf(stderr, "GnuTLS error: %s\n",
411
505
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
506
gnutls_deinit(*session);
413
507
return -1;
414
508
}
415
509
}
416
510
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
511
do {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
513
mc.cred);
514
if(quit_now){
515
gnutls_deinit(*session);
516
return -1;
517
}
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
if(ret != GNUTLS_E_SUCCESS){
420
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
521
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
522
gnutls_deinit(*session);
423
523
return -1;
424
524
}
425
525
426
526
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
429
528
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
431
530
432
531
return 0;
433
532
}
439
538
/* Called when a Mandos server is found */
440
539
static int start_mandos_communication(const char *ip, uint16_t port,
441
540
AvahiIfIndex if_index,
442
mandos_context *mc){
443
int ret, tcp_sd;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
541
int af){
542
int ret, tcp_sd = -1;
543
ssize_t sret;
544
union {
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
547
} to;
445
548
char *buffer = NULL;
446
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
447
550
size_t buffer_length = 0;
448
551
size_t buffer_capacity = 0;
449
ssize_t decrypted_buffer_size;
450
552
size_t written;
451
int retval = 0;
452
char interface[IF_NAMESIZE];
553
int retval = -1;
453
554
gnutls_session_t session;
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
555
int pf; /* Protocol family */
556
557
errno = 0;
558
559
if(quit_now){
560
errno = EINTR;
561
return -1;
562
}
563
564
switch(af){
565
case AF_INET6:
566
pf = PF_INET6;
567
break;
568
case AF_INET:
569
pf = PF_INET;
570
break;
571
default:
572
fprintf(stderr, "Bad address family: %d\n", af);
573
errno = EINVAL;
574
return -1;
575
}
576
577
ret = init_gnutls_session(&session);
578
if(ret != 0){
457
579
return -1;
458
580
}
459
581
460
582
if(debug){
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
583
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
462
584
"\n", ip, port);
463
585
}
464
586
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
466
if(tcp_sd < 0) {
587
tcp_sd = socket(pf, SOCK_STREAM, 0);
588
if(tcp_sd < 0){
589
int e = errno;
467
590
perror("socket");
468
return -1;
591
errno = e;
592
goto mandos_end;
469
593
}
470
471
if(debug){
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
474
return -1;
475
}
476
fprintf(stderr, "Binding to interface %s\n", interface);
594
595
if(quit_now){
596
errno = EINTR;
597
goto mandos_end;
477
598
}
478
599
479
600
memset(&to, 0, sizeof(to));
480
to.in6.sin6_family = AF_INET6;
481
/* It would be nice to have a way to detect if we were passed an
482
IPv4 address here. Now we assume an IPv6 address. */
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
484
if (ret < 0 ){
601
if(af == AF_INET6){
602
to.in6.sin6_family = (sa_family_t)af;
603
ret = inet_pton(af, ip, &to.in6.sin6_addr);
604
} else { /* IPv4 */
605
to.in.sin_family = (sa_family_t)af;
606
ret = inet_pton(af, ip, &to.in.sin_addr);
607
}
608
if(ret < 0 ){
609
int e = errno;
485
610
perror("inet_pton");
486
return -1;
611
errno = e;
612
goto mandos_end;
487
613
}
488
614
if(ret == 0){
615
int e = errno;
489
616
fprintf(stderr, "Bad address: %s\n", ip);
490
return -1;
491
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
617
errno = e;
618
goto mandos_end;
619
}
620
if(af == AF_INET6){
621
to.in6.sin6_port = htons(port); /* Spurious warnings from
622
-Wconversion and
623
-Wunreachable-code */
624
625
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
626
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
627
-Wunreachable-code*/
628
if(if_index == AVAHI_IF_UNSPEC){
629
fprintf(stderr, "An IPv6 link-local address is incomplete"
630
" without a network interface\n");
631
errno = EINVAL;
632
goto mandos_end;
633
}
634
/* Set the network interface number as scope */
635
to.in6.sin6_scope_id = (uint32_t)if_index;
636
}
637
} else {
638
to.in.sin_port = htons(port); /* Spurious warnings from
639
-Wconversion and
640
-Wunreachable-code */
641
}
493
642
494
to.in6.sin6_scope_id = (uint32_t)if_index;
643
if(quit_now){
644
errno = EINTR;
645
goto mandos_end;
646
}
495
647
496
648
if(debug){
497
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
port);
499
char addrstr[INET6_ADDRSTRLEN] = "";
500
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
501
sizeof(addrstr)) == NULL){
649
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
650
char interface[IF_NAMESIZE];
651
if(if_indextoname((unsigned int)if_index, interface) == NULL){
652
perror("if_indextoname");
653
} else {
654
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
655
ip, interface, port);
656
}
657
} else {
658
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
659
port);
660
}
661
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
662
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
663
const char *pcret;
664
if(af == AF_INET6){
665
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
666
sizeof(addrstr));
667
} else {
668
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
669
sizeof(addrstr));
670
}
671
if(pcret == NULL){
502
672
perror("inet_ntop");
503
673
} else {
504
674
if(strcmp(addrstr, ip) != 0){
507
677
}
508
678
}
509
679
510
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
680
if(quit_now){
681
errno = EINTR;
682
goto mandos_end;
683
}
684
685
if(af == AF_INET6){
686
ret = connect(tcp_sd, &to.in6, sizeof(to));
687
} else {
688
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
689
}
690
if(ret < 0){
691
int e = errno;
512
692
perror("connect");
513
return -1;
514
}
515
693
errno = e;
694
goto mandos_end;
695
}
696
697
if(quit_now){
698
errno = EINTR;
699
goto mandos_end;
700
}
701
516
702
const char *out = mandos_protocol_version;
517
703
written = 0;
518
while (true){
704
while(true){
519
705
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
706
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
707
out_size - written));
522
if (ret == -1){
708
if(ret == -1){
709
int e = errno;
523
710
perror("write");
524
retval = -1;
711
errno = e;
525
712
goto mandos_end;
526
713
}
527
714
written += (size_t)ret;
528
715
if(written < out_size){
529
716
continue;
530
717
} else {
531
if (out == mandos_protocol_version){
718
if(out == mandos_protocol_version){
532
719
written = 0;
533
720
out = "\r\n";
534
721
} else {
535
722
break;
536
723
}
537
724
}
725
726
if(quit_now){
727
errno = EINTR;
728
goto mandos_end;
729
}
538
730
}
539
731
540
732
if(debug){
541
733
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
734
}
543
735
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
546
do{
547
ret = gnutls_handshake (session);
736
if(quit_now){
737
errno = EINTR;
738
goto mandos_end;
739
}
740
741
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
742
743
if(quit_now){
744
errno = EINTR;
745
goto mandos_end;
746
}
747
748
do {
749
ret = gnutls_handshake(session);
750
if(quit_now){
751
errno = EINTR;
752
goto mandos_end;
753
}
548
754
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
755
550
if (ret != GNUTLS_E_SUCCESS){
756
if(ret != GNUTLS_E_SUCCESS){
551
757
if(debug){
552
758
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
553
gnutls_perror (ret);
759
gnutls_perror(ret);
554
760
}
555
retval = -1;
761
errno = EPROTO;
556
762
goto mandos_end;
557
763
}
558
764
559
765
/* Read OpenPGP packet that contains the wanted password */
560
766
561
767
if(debug){
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
768
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
563
769
ip);
564
770
}
565
771
566
772
while(true){
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
773
774
if(quit_now){
775
errno = EINTR;
776
goto mandos_end;
777
}
778
779
buffer_capacity = incbuffer(&buffer, buffer_length,
568
780
buffer_capacity);
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
571
retval = -1;
572
goto mandos_end;
573
}
574
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
781
if(buffer_capacity == 0){
782
int e = errno;
783
perror("incbuffer");
784
errno = e;
785
goto mandos_end;
786
}
787
788
if(quit_now){
789
errno = EINTR;
790
goto mandos_end;
791
}
792
793
sret = gnutls_record_recv(session, buffer+buffer_length,
794
BUFFER_SIZE);
795
if(sret == 0){
578
796
break;
579
797
}
580
if (ret < 0){
581
switch(ret){
798
if(sret < 0){
799
switch(sret){
582
800
case GNUTLS_E_INTERRUPTED:
583
801
case GNUTLS_E_AGAIN:
584
802
break;
585
803
case GNUTLS_E_REHANDSHAKE:
586
do{
587
ret = gnutls_handshake (session);
804
do {
805
ret = gnutls_handshake(session);
806
807
if(quit_now){
808
errno = EINTR;
809
goto mandos_end;
810
}
588
811
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
if (ret < 0){
812
if(ret < 0){
590
813
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
591
gnutls_perror (ret);
592
retval = -1;
814
gnutls_perror(ret);
815
errno = EPROTO;
593
816
goto mandos_end;
594
817
}
595
818
break;
596
819
default:
597
820
fprintf(stderr, "Unknown error while reading data from"
598
821
" encrypted session with Mandos server\n");
599
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
822
gnutls_bye(session, GNUTLS_SHUT_RDWR);
823
errno = EIO;
601
824
goto mandos_end;
602
825
}
603
826
} else {
604
buffer_length += (size_t) ret;
827
buffer_length += (size_t) sret;
605
828
}
606
829
}
607
830
609
832
fprintf(stderr, "Closing TLS session\n");
610
833
}
611
834
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
613
614
if (buffer_length > 0){
835
if(quit_now){
836
errno = EINTR;
837
goto mandos_end;
838
}
839
840
do {
841
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
847
848
if(buffer_length > 0){
849
ssize_t decrypted_buffer_size;
615
850
decrypted_buffer_size = pgp_packet_decrypt(buffer,
616
851
buffer_length,
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
852
&decrypted_buffer);
853
if(decrypted_buffer_size >= 0){
854
620
855
written = 0;
621
856
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
857
if(quit_now){
858
errno = EINTR;
859
goto mandos_end;
860
}
861
862
ret = (int)fwrite(decrypted_buffer + written, 1,
863
(size_t)decrypted_buffer_size - written,
864
stdout);
625
865
if(ret == 0 and ferror(stdout)){
866
int e = errno;
626
867
if(debug){
627
868
fprintf(stderr, "Error writing encrypted data: %s\n",
628
869
strerror(errno));
629
870
}
630
retval = -1;
631
break;
871
errno = e;
872
goto mandos_end;
632
873
}
633
874
written += (size_t)ret;
634
875
}
635
free(decrypted_buffer);
636
} else {
637
retval = -1;
876
retval = 0;
638
877
}
639
878
}
640
879
641
880
/* Shutdown procedure */
642
881
643
882
mandos_end:
644
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
883
{
884
int e = errno;
885
free(decrypted_buffer);
886
free(buffer);
887
if(tcp_sd >= 0){
888
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
889
}
890
if(ret == -1){
891
if(e == 0){
892
e = errno;
893
}
894
perror("close");
895
}
896
gnutls_deinit(session);
897
if(quit_now){
898
e = EINTR;
899
retval = -1;
900
}
901
errno = e;
902
}
647
903
return retval;
648
904
}
649
905
650
906
static void resolve_callback(AvahiSServiceResolver *r,
651
907
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
908
AvahiProtocol proto,
653
909
AvahiResolverEvent event,
654
910
const char *name,
655
911
const char *type,
660
916
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
917
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
918
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
919
AVAHI_GCC_UNUSED void* userdata){
665
920
assert(r);
666
921
667
922
/* Called whenever a service has been resolved successfully or
668
923
timed out */
669
924
670
switch (event) {
925
if(quit_now){
926
return;
927
}
928
929
switch(event){
671
930
default:
672
931
case AVAHI_RESOLVER_FAILURE:
673
932
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
933
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
934
avahi_strerror(avahi_server_errno(mc.server)));
676
935
break;
677
936
678
937
case AVAHI_RESOLVER_FOUND:
681
940
avahi_address_snprint(ip, sizeof(ip), address);
682
941
if(debug){
683
942
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
943
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
944
ip, (intmax_t)interface, port);
686
945
}
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
946
int ret = start_mandos_communication(ip, port, interface,
947
avahi_proto_to_af(proto));
948
if(ret == 0){
949
avahi_simple_poll_quit(mc.simple_poll);
690
950
}
691
951
}
692
952
}
693
953
avahi_s_service_resolver_free(r);
694
954
}
695
955
696
static void browse_callback( AvahiSServiceBrowser *b,
697
AvahiIfIndex interface,
698
AvahiProtocol protocol,
699
AvahiBrowserEvent event,
700
const char *name,
701
const char *type,
702
const char *domain,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
704
flags,
705
void* userdata) {
706
mandos_context *mc = userdata;
956
static void browse_callback(AvahiSServiceBrowser *b,
957
AvahiIfIndex interface,
958
AvahiProtocol protocol,
959
AvahiBrowserEvent event,
960
const char *name,
961
const char *type,
962
const char *domain,
963
AVAHI_GCC_UNUSED AvahiLookupResultFlags
964
flags,
965
AVAHI_GCC_UNUSED void* userdata){
707
966
assert(b);
708
967
709
968
/* Called whenever a new services becomes available on the LAN or
710
969
is removed from the LAN */
711
970
712
switch (event) {
971
if(quit_now){
972
return;
973
}
974
975
switch(event){
713
976
default:
714
977
case AVAHI_BROWSER_FAILURE:
715
978
716
979
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
980
avahi_strerror(avahi_server_errno(mc.server)));
981
avahi_simple_poll_quit(mc.simple_poll);
719
982
return;
720
983
721
984
case AVAHI_BROWSER_NEW:
724
987
the callback function is called the Avahi server will free the
725
988
resolver for us. */
726
989
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
990
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
991
name, type, domain, protocol, 0,
992
resolve_callback, NULL) == NULL)
731
993
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
994
name, avahi_strerror(avahi_server_errno(mc.server)));
733
995
break;
734
996
735
997
case AVAHI_BROWSER_REMOVE:
744
1006
}
745
1007
}
746
1008
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
1009
/* stop main loop after sigterm has been called */
1010
static void handle_sigterm(int sig){
1011
if(quit_now){
1012
return;
1013
}
1014
quit_now = 1;
1015
signal_received = sig;
1016
int old_errno = errno;
1017
if(mc.simple_poll != NULL){
1018
avahi_simple_poll_quit(mc.simple_poll);
1019
}
1020
errno = old_errno;
1021
}
1022
1023
int main(int argc, char *argv[]){
1024
AvahiSServiceBrowser *sb = NULL;
1025
int error;
1026
int ret;
1027
intmax_t tmpmax;
750
1028
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
756
}
757
758
759
int main(int argc, char *argv[]){
760
AvahiSServiceBrowser *sb = NULL;
761
int error;
762
int ret;
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
766
int sd;
767
uid_t uid;
768
gid_t gid;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
778
779
{
780
struct argp_option options[] = {
781
{ .name = "debug", .key = 128,
782
.doc = "Debug mode", .group = 3 },
783
{ .name = "connect", .key = 'c',
784
.arg = "IP",
785
.doc = "Connect directly to a sepcified mandos server",
786
.group = 1 },
787
{ .name = "interface", .key = 'i',
788
.arg = "INTERFACE",
789
.doc = "Interface that Avahi will conntect through",
790
.group = 1 },
791
{ .name = "keydir", .key = 'd',
792
.arg = "KEYDIR",
793
.doc = "Directory where the openpgp keyring is",
794
.group = 1 },
795
{ .name = "seckey", .key = 's',
796
.arg = "SECKEY",
797
.doc = "Secret openpgp key for gnutls authentication",
798
.group = 1 },
799
{ .name = "pubkey", .key = 'p',
800
.arg = "PUBKEY",
801
.doc = "Public openpgp key for gnutls authentication",
802
.group = 2 },
803
{ .name = "dh-bits", .key = 129,
804
.arg = "BITS",
805
.doc = "dh-bits to use in gnutls communication",
806
.group = 2 },
807
{ .name = "priority", .key = 130,
808
.arg = "PRIORITY",
809
.doc = "GNUTLS priority", .group = 1 },
810
{ .name = NULL }
811
};
812
813
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
818
switch (key) {
819
case 128:
820
debug = true;
821
break;
822
case 'c':
823
connect_to = arg;
824
break;
825
case 'i':
826
interface = arg;
827
break;
828
case 'd':
829
keydir = arg;
830
break;
831
case 's':
832
seckeyname = arg;
833
break;
834
case 'p':
835
pubkeyname = arg;
836
break;
837
case 129:
838
errno = 0;
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
840
if (errno){
841
perror("strtol");
842
exit(EXIT_FAILURE);
843
}
844
break;
845
case 130:
846
mc.priority = arg;
847
break;
848
case ARGP_KEY_ARG:
849
argp_usage (state);
850
case ARGP_KEY_END:
851
break;
852
default:
853
return ARGP_ERR_UNKNOWN;
854
}
855
return 0;
856
}
857
858
struct argp argp = { .options = options, .parser = parse_opt,
859
.args_doc = "",
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
866
goto end;
867
}
868
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
if (ret == -1){
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
} else {
890
gnutls_initalized = true;
891
}
892
893
/* If the interface is down, bring it up */
894
{
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
896
if(sd < 0) {
897
perror("socket");
898
exitcode = EXIT_FAILURE;
899
goto end;
900
}
901
strcpy(network.ifr_name, interface);
902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
if(ret == -1){
904
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
906
goto end;
907
}
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
if(ret == -1){
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
close(sd);
918
}
919
920
uid = getuid();
921
gid = getgid();
922
923
ret = setuid(uid);
924
if (ret == -1){
925
perror("setuid");
926
}
927
928
setgid(gid);
929
if (ret == -1){
930
perror("setgid");
931
}
932
1029
int exitcode = EXIT_SUCCESS;
1030
const char *interface = "eth0";
1031
struct ifreq network;
1032
int sd = -1;
1033
bool take_down_interface = false;
1034
uid_t uid;
1035
gid_t gid;
1036
char *connect_to = NULL;
1037
char tempdir[] = "/tmp/mandosXXXXXX";
1038
bool tempdir_created = false;
1039
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1040
const char *seckey = PATHDIR "/" SECKEY;
1041
const char *pubkey = PATHDIR "/" PUBKEY;
1042
1043
bool gnutls_initialized = false;
1044
bool gpgme_initialized = false;
1045
float delay = 2.5f;
1046
1047
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1048
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1049
1050
uid = getuid();
1051
gid = getgid();
1052
1053
/* Lower any group privileges we might have, just to be safe */
1054
errno = 0;
1055
ret = setgid(gid);
1056
if(ret == -1){
1057
perror("setgid");
1058
}
1059
1060
/* Lower user privileges (temporarily) */
1061
errno = 0;
1062
ret = seteuid(uid);
1063
if(ret == -1){
1064
perror("seteuid");
1065
}
1066
1067
if(quit_now){
1068
goto end;
1069
}
1070
1071
{
1072
struct argp_option options[] = {
1073
{ .name = "debug", .key = 128,
1074
.doc = "Debug mode", .group = 3 },
1075
{ .name = "connect", .key = 'c',
1076
.arg = "ADDRESS:PORT",
1077
.doc = "Connect directly to a specific Mandos server",
1078
.group = 1 },
1079
{ .name = "interface", .key = 'i',
1080
.arg = "NAME",
1081
.doc = "Network interface that will be used to search for"
1082
" Mandos servers",
1083
.group = 1 },
1084
{ .name = "seckey", .key = 's',
1085
.arg = "FILE",
1086
.doc = "OpenPGP secret key file base name",
1087
.group = 1 },
1088
{ .name = "pubkey", .key = 'p',
1089
.arg = "FILE",
1090
.doc = "OpenPGP public key file base name",
1091
.group = 2 },
1092
{ .name = "dh-bits", .key = 129,
1093
.arg = "BITS",
1094
.doc = "Bit length of the prime number used in the"
1095
" Diffie-Hellman key exchange",
1096
.group = 2 },
1097
{ .name = "priority", .key = 130,
1098
.arg = "STRING",
1099
.doc = "GnuTLS priority string for the TLS handshake",
1100
.group = 1 },
1101
{ .name = "delay", .key = 131,
1102
.arg = "SECONDS",
1103
.doc = "Maximum delay to wait for interface startup",
1104
.group = 2 },
1105
/*
1106
* These reproduce what we would get without ARGP_NO_HELP
1107
*/
1108
{ .name = "help", .key = '?',
1109
.doc = "Give this help list", .group = -1 },
1110
{ .name = "usage", .key = -3,
1111
.doc = "Give a short usage message", .group = -1 },
1112
{ .name = "version", .key = 'V',
1113
.doc = "Print program version", .group = -1 },
1114
{ .name = NULL }
1115
};
1116
1117
error_t parse_opt(int key, char *arg,
1118
struct argp_state *state){
1119
errno = 0;
1120
switch(key){
1121
case 128: /* --debug */
1122
debug = true;
1123
break;
1124
case 'c': /* --connect */
1125
connect_to = arg;
1126
break;
1127
case 'i': /* --interface */
1128
interface = arg;
1129
break;
1130
case 's': /* --seckey */
1131
seckey = arg;
1132
break;
1133
case 'p': /* --pubkey */
1134
pubkey = arg;
1135
break;
1136
case 129: /* --dh-bits */
1137
errno = 0;
1138
tmpmax = strtoimax(arg, &tmp, 10);
1139
if(errno != 0 or tmp == arg or *tmp != '\0'
1140
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1141
argp_error(state, "Bad number of DH bits");
1142
}
1143
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1144
break;
1145
case 130: /* --priority */
1146
mc.priority = arg;
1147
break;
1148
case 131: /* --delay */
1149
errno = 0;
1150
delay = strtof(arg, &tmp);
1151
if(errno != 0 or tmp == arg or *tmp != '\0'){
1152
argp_error(state, "Bad delay");
1153
}
1154
break;
1155
/*
1156
* These reproduce what we would get without ARGP_NO_HELP
1157
*/
1158
case '?': /* --help */
1159
argp_state_help(state, state->out_stream,
1160
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1161
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1162
case -3: /* --usage */
1163
argp_state_help(state, state->out_stream,
1164
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1165
case 'V': /* --version */
1166
fprintf(state->out_stream, "%s\n", argp_program_version);
1167
exit(argp_err_exit_status);
1168
break;
1169
default:
1170
return ARGP_ERR_UNKNOWN;
1171
}
1172
return errno;
1173
}
1174
1175
struct argp argp = { .options = options, .parser = parse_opt,
1176
.args_doc = "",
1177
.doc = "Mandos client -- Get and decrypt"
1178
" passwords from a Mandos server" };
1179
ret = argp_parse(&argp, argc, argv,
1180
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1181
switch(ret){
1182
case 0:
1183
break;
1184
case ENOMEM:
1185
default:
1186
errno = ret;
1187
perror("argp_parse");
1188
exitcode = EX_OSERR;
1189
goto end;
1190
case EINVAL:
1191
exitcode = EX_USAGE;
1192
goto end;
1193
}
1194
}
1195
1196
if(not debug){
1197
avahi_set_log_function(empty_log);
1198
}
1199
1200
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1201
from the signal handler */
1202
/* Initialize the pseudo-RNG for Avahi */
1203
srand((unsigned int) time(NULL));
1204
mc.simple_poll = avahi_simple_poll_new();
1205
if(mc.simple_poll == NULL){
1206
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1207
exitcode = EX_UNAVAILABLE;
1208
goto end;
1209
}
1210
1211
sigemptyset(&sigterm_action.sa_mask);
1212
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1213
if(ret == -1){
1214
perror("sigaddset");
1215
exitcode = EX_OSERR;
1216
goto end;
1217
}
1218
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1219
if(ret == -1){
1220
perror("sigaddset");
1221
exitcode = EX_OSERR;
1222
goto end;
1223
}
1224
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1225
if(ret == -1){
1226
perror("sigaddset");
1227
exitcode = EX_OSERR;
1228
goto end;
1229
}
1230
/* Need to check if the handler is SIG_IGN before handling:
1231
| [[info:libc:Initial Signal Actions]] |
1232
| [[info:libc:Basic Signal Handling]] |
1233
*/
1234
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1235
if(ret == -1){
1236
perror("sigaction");
1237
return EX_OSERR;
1238
}
1239
if(old_sigterm_action.sa_handler != SIG_IGN){
1240
ret = sigaction(SIGINT, &sigterm_action, NULL);
1241
if(ret == -1){
1242
perror("sigaction");
1243
exitcode = EX_OSERR;
1244
goto end;
1245
}
1246
}
1247
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1248
if(ret == -1){
1249
perror("sigaction");
1250
return EX_OSERR;
1251
}
1252
if(old_sigterm_action.sa_handler != SIG_IGN){
1253
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1254
if(ret == -1){
1255
perror("sigaction");
1256
exitcode = EX_OSERR;
1257
goto end;
1258
}
1259
}
1260
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1261
if(ret == -1){
1262
perror("sigaction");
1263
return EX_OSERR;
1264
}
1265
if(old_sigterm_action.sa_handler != SIG_IGN){
1266
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1267
if(ret == -1){
1268
perror("sigaction");
1269
exitcode = EX_OSERR;
1270
goto end;
1271
}
1272
}
1273
1274
/* If the interface is down, bring it up */
1275
if(interface[0] != '\0'){
933
1276
if_index = (AvahiIfIndex) if_nametoindex(interface);
934
1277
if(if_index == 0){
935
1278
fprintf(stderr, "No such interface: \"%s\"\n", interface);
936
exit(EXIT_FAILURE);
937
}
938
939
if(connect_to != NULL){
940
/* Connect directly, do not use Zeroconf */
941
/* (Mainly meant for debugging) */
942
char *address = strrchr(connect_to, ':');
943
if(address == NULL){
944
fprintf(stderr, "No colon in address\n");
945
exitcode = EXIT_FAILURE;
946
goto end;
947
}
948
errno = 0;
949
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
if(errno){
951
perror("Bad port number");
952
exitcode = EXIT_FAILURE;
953
goto end;
954
}
955
*address = '\0';
956
address = connect_to;
957
ret = start_mandos_communication(address, port, if_index, &mc);
958
if(ret < 0){
959
exitcode = EXIT_FAILURE;
960
} else {
961
exitcode = EXIT_SUCCESS;
962
}
963
goto end;
964
}
965
966
if (not debug){
967
avahi_set_log_function(empty_log);
968
}
969
970
/* Initialize the pseudo-RNG for Avahi */
971
srand((unsigned int) time(NULL));
972
973
/* Allocate main Avahi loop object */
974
mc.simple_poll = avahi_simple_poll_new();
975
if (mc.simple_poll == NULL) {
976
fprintf(stderr, "Avahi: Failed to create simple poll"
977
" object.\n");
978
exitcode = EXIT_FAILURE;
979
goto end;
980
}
981
982
{
983
AvahiServerConfig config;
984
/* Do not publish any local Zeroconf records */
985
avahi_server_config_init(&config);
986
config.publish_hinfo = 0;
987
config.publish_addresses = 0;
988
config.publish_workstation = 0;
989
config.publish_domain = 0;
990
991
/* Allocate a new server */
992
mc.server = avahi_server_new(avahi_simple_poll_get
993
(mc.simple_poll), &config, NULL,
994
NULL, &error);
995
996
/* Free the Avahi configuration data */
997
avahi_server_config_free(&config);
998
}
999
1000
/* Check if creating the Avahi server object succeeded */
1001
if (mc.server == NULL) {
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
1003
avahi_strerror(error));
1004
exitcode = EXIT_FAILURE;
1005
goto end;
1006
}
1007
1008
/* Create the Avahi service browser */
1009
sb = avahi_s_service_browser_new(mc.server, if_index,
1010
AVAHI_PROTO_INET6,
1011
"_mandos._tcp", NULL, 0,
1012
browse_callback, &mc);
1013
if (sb == NULL) {
1014
fprintf(stderr, "Failed to create service browser: %s\n",
1015
avahi_strerror(avahi_server_errno(mc.server)));
1016
exitcode = EXIT_FAILURE;
1017
goto end;
1018
}
1019
1020
/* Run the main loop */
1021
1022
if (debug){
1023
fprintf(stderr, "Starting Avahi loop search\n");
1024
}
1025
1026
avahi_simple_poll_loop(mc.simple_poll);
1027
1279
exitcode = EX_UNAVAILABLE;
1280
goto end;
1281
}
1282
1283
if(quit_now){
1284
goto end;
1285
}
1286
1287
/* Re-raise priviliges */
1288
errno = 0;
1289
ret = seteuid(0);
1290
if(ret == -1){
1291
perror("seteuid");
1292
}
1293
1294
#ifdef __linux__
1295
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1296
messages about the network interface to mess up the prompt */
1297
ret = klogctl(8, NULL, 5);
1298
bool restore_loglevel = true;
1299
if(ret == -1){
1300
restore_loglevel = false;
1301
perror("klogctl");
1302
}
1303
#endif /* __linux__ */
1304
1305
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1306
if(sd < 0){
1307
perror("socket");
1308
exitcode = EX_OSERR;
1309
#ifdef __linux__
1310
if(restore_loglevel){
1311
ret = klogctl(7, NULL, 0);
1312
if(ret == -1){
1313
perror("klogctl");
1314
}
1315
}
1316
#endif /* __linux__ */
1317
/* Lower privileges */
1318
errno = 0;
1319
ret = seteuid(uid);
1320
if(ret == -1){
1321
perror("seteuid");
1322
}
1323
goto end;
1324
}
1325
strcpy(network.ifr_name, interface);
1326
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1327
if(ret == -1){
1328
perror("ioctl SIOCGIFFLAGS");
1329
#ifdef __linux__
1330
if(restore_loglevel){
1331
ret = klogctl(7, NULL, 0);
1332
if(ret == -1){
1333
perror("klogctl");
1334
}
1335
}
1336
#endif /* __linux__ */
1337
exitcode = EX_OSERR;
1338
/* Lower privileges */
1339
errno = 0;
1340
ret = seteuid(uid);
1341
if(ret == -1){
1342
perror("seteuid");
1343
}
1344
goto end;
1345
}
1346
if((network.ifr_flags & IFF_UP) == 0){
1347
network.ifr_flags |= IFF_UP;
1348
take_down_interface = true;
1349
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1350
if(ret == -1){
1351
take_down_interface = false;
1352
perror("ioctl SIOCSIFFLAGS");
1353
exitcode = EX_OSERR;
1354
#ifdef __linux__
1355
if(restore_loglevel){
1356
ret = klogctl(7, NULL, 0);
1357
if(ret == -1){
1358
perror("klogctl");
1359
}
1360
}
1361
#endif /* __linux__ */
1362
/* Lower privileges */
1363
errno = 0;
1364
ret = seteuid(uid);
1365
if(ret == -1){
1366
perror("seteuid");
1367
}
1368
goto end;
1369
}
1370
}
1371
/* sleep checking until interface is running */
1372
for(int i=0; i < delay * 4; i++){
1373
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1374
if(ret == -1){
1375
perror("ioctl SIOCGIFFLAGS");
1376
} else if(network.ifr_flags & IFF_RUNNING){
1377
break;
1378
}
1379
struct timespec sleeptime = { .tv_nsec = 250000000 };
1380
ret = nanosleep(&sleeptime, NULL);
1381
if(ret == -1 and errno != EINTR){
1382
perror("nanosleep");
1383
}
1384
}
1385
if(not take_down_interface){
1386
/* We won't need the socket anymore */
1387
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1388
if(ret == -1){
1389
perror("close");
1390
}
1391
}
1392
#ifdef __linux__
1393
if(restore_loglevel){
1394
/* Restores kernel loglevel to default */
1395
ret = klogctl(7, NULL, 0);
1396
if(ret == -1){
1397
perror("klogctl");
1398
}
1399
}
1400
#endif /* __linux__ */
1401
/* Lower privileges */
1402
errno = 0;
1403
if(take_down_interface){
1404
/* Lower privileges */
1405
ret = seteuid(uid);
1406
if(ret == -1){
1407
perror("seteuid");
1408
}
1409
} else {
1410
/* Lower privileges permanently */
1411
ret = setuid(uid);
1412
if(ret == -1){
1413
perror("setuid");
1414
}
1415
}
1416
}
1417
1418
if(quit_now){
1419
goto end;
1420
}
1421
1422
ret = init_gnutls_global(pubkey, seckey);
1423
if(ret == -1){
1424
fprintf(stderr, "init_gnutls_global failed\n");
1425
exitcode = EX_UNAVAILABLE;
1426
goto end;
1427
} else {
1428
gnutls_initialized = true;
1429
}
1430
1431
if(quit_now){
1432
goto end;
1433
}
1434
1435
tempdir_created = true;
1436
if(mkdtemp(tempdir) == NULL){
1437
tempdir_created = false;
1438
perror("mkdtemp");
1439
goto end;
1440
}
1441
1442
if(quit_now){
1443
goto end;
1444
}
1445
1446
if(not init_gpgme(pubkey, seckey, tempdir)){
1447
fprintf(stderr, "init_gpgme failed\n");
1448
exitcode = EX_UNAVAILABLE;
1449
goto end;
1450
} else {
1451
gpgme_initialized = true;
1452
}
1453
1454
if(quit_now){
1455
goto end;
1456
}
1457
1458
if(connect_to != NULL){
1459
/* Connect directly, do not use Zeroconf */
1460
/* (Mainly meant for debugging) */
1461
char *address = strrchr(connect_to, ':');
1462
if(address == NULL){
1463
fprintf(stderr, "No colon in address\n");
1464
exitcode = EX_USAGE;
1465
goto end;
1466
}
1467
1468
if(quit_now){
1469
goto end;
1470
}
1471
1472
uint16_t port;
1473
errno = 0;
1474
tmpmax = strtoimax(address+1, &tmp, 10);
1475
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1476
or tmpmax != (uint16_t)tmpmax){
1477
fprintf(stderr, "Bad port number\n");
1478
exitcode = EX_USAGE;
1479
goto end;
1480
}
1481
1482
if(quit_now){
1483
goto end;
1484
}
1485
1486
port = (uint16_t)tmpmax;
1487
*address = '\0';
1488
address = connect_to;
1489
/* Colon in address indicates IPv6 */
1490
int af;
1491
if(strchr(address, ':') != NULL){
1492
af = AF_INET6;
1493
} else {
1494
af = AF_INET;
1495
}
1496
1497
if(quit_now){
1498
goto end;
1499
}
1500
1501
ret = start_mandos_communication(address, port, if_index, af);
1502
if(ret < 0){
1503
switch(errno){
1504
case ENETUNREACH:
1505
case EHOSTDOWN:
1506
case EHOSTUNREACH:
1507
exitcode = EX_NOHOST;
1508
break;
1509
case EINVAL:
1510
exitcode = EX_USAGE;
1511
break;
1512
case EIO:
1513
exitcode = EX_IOERR;
1514
break;
1515
case EPROTO:
1516
exitcode = EX_PROTOCOL;
1517
break;
1518
default:
1519
exitcode = EX_OSERR;
1520
break;
1521
}
1522
} else {
1523
exitcode = EXIT_SUCCESS;
1524
}
1525
goto end;
1526
}
1527
1528
if(quit_now){
1529
goto end;
1530
}
1531
1532
{
1533
AvahiServerConfig config;
1534
/* Do not publish any local Zeroconf records */
1535
avahi_server_config_init(&config);
1536
config.publish_hinfo = 0;
1537
config.publish_addresses = 0;
1538
config.publish_workstation = 0;
1539
config.publish_domain = 0;
1540
1541
/* Allocate a new server */
1542
mc.server = avahi_server_new(avahi_simple_poll_get
1543
(mc.simple_poll), &config, NULL,
1544
NULL, &error);
1545
1546
/* Free the Avahi configuration data */
1547
avahi_server_config_free(&config);
1548
}
1549
1550
/* Check if creating the Avahi server object succeeded */
1551
if(mc.server == NULL){
1552
fprintf(stderr, "Failed to create Avahi server: %s\n",
1553
avahi_strerror(error));
1554
exitcode = EX_UNAVAILABLE;
1555
goto end;
1556
}
1557
1558
if(quit_now){
1559
goto end;
1560
}
1561
1562
/* Create the Avahi service browser */
1563
sb = avahi_s_service_browser_new(mc.server, if_index,
1564
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1565
NULL, 0, browse_callback, NULL);
1566
if(sb == NULL){
1567
fprintf(stderr, "Failed to create service browser: %s\n",
1568
avahi_strerror(avahi_server_errno(mc.server)));
1569
exitcode = EX_UNAVAILABLE;
1570
goto end;
1571
}
1572
1573
if(quit_now){
1574
goto end;
1575
}
1576
1577
/* Run the main loop */
1578
1579
if(debug){
1580
fprintf(stderr, "Starting Avahi loop search\n");
1581
}
1582
1583
avahi_simple_poll_loop(mc.simple_poll);
1584
1028
1585
end:
1029
1030
if (debug){
1031
fprintf(stderr, "%s exiting\n", argv[0]);
1032
}
1033
1034
/* Cleanup things */
1035
if (sb != NULL)
1036
avahi_s_service_browser_free(sb);
1037
1038
if (mc.server != NULL)
1039
avahi_server_free(mc.server);
1040
1041
if (mc.simple_poll != NULL)
1042
avahi_simple_poll_free(mc.simple_poll);
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1045
1046
if (gnutls_initalized){
1047
gnutls_certificate_free_credentials(mc.cred);
1048
gnutls_global_deinit ();
1049
}
1050
1051
return exitcode;
1586
1587
if(debug){
1588
fprintf(stderr, "%s exiting\n", argv[0]);
1589
}
1590
1591
/* Cleanup things */
1592
if(sb != NULL)
1593
avahi_s_service_browser_free(sb);
1594
1595
if(mc.server != NULL)
1596
avahi_server_free(mc.server);
1597
1598
if(mc.simple_poll != NULL)
1599
avahi_simple_poll_free(mc.simple_poll);
1600
1601
if(gnutls_initialized){
1602
gnutls_certificate_free_credentials(mc.cred);
1603
gnutls_global_deinit();
1604
gnutls_dh_params_deinit(mc.dh_params);
1605
}
1606
1607
if(gpgme_initialized){
1608
gpgme_release(mc.ctx);
1609
}
1610
1611
/* Take down the network interface */
1612
if(take_down_interface){
1613
/* Re-raise priviliges */
1614
errno = 0;
1615
ret = seteuid(0);
1616
if(ret == -1){
1617
perror("seteuid");
1618
}
1619
if(geteuid() == 0){
1620
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1621
if(ret == -1){
1622
perror("ioctl SIOCGIFFLAGS");
1623
} else if(network.ifr_flags & IFF_UP) {
1624
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1625
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1626
if(ret == -1){
1627
perror("ioctl SIOCSIFFLAGS");
1628
}
1629
}
1630
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1631
if(ret == -1){
1632
perror("close");
1633
}
1634
/* Lower privileges permanently */
1635
errno = 0;
1636
ret = setuid(uid);
1637
if(ret == -1){
1638
perror("setuid");
1639
}
1640
}
1641
}
1642
1643
/* Removes the temp directory used by GPGME */
1644
if(tempdir_created){
1645
DIR *d;
1646
struct dirent *direntry;
1647
d = opendir(tempdir);
1648
if(d == NULL){
1649
if(errno != ENOENT){
1650
perror("opendir");
1651
}
1652
} else {
1653
while(true){
1654
direntry = readdir(d);
1655
if(direntry == NULL){
1656
break;
1657
}
1658
/* Skip "." and ".." */
1659
if(direntry->d_name[0] == '.'
1660
and (direntry->d_name[1] == '\0'
1661
or (direntry->d_name[1] == '.'
1662
and direntry->d_name[2] == '\0'))){
1663
continue;
1664
}
1665
char *fullname = NULL;
1666
ret = asprintf(&fullname, "%s/%s", tempdir,
1667
direntry->d_name);
1668
if(ret < 0){
1669
perror("asprintf");
1670
continue;
1671
}
1672
ret = remove(fullname);
1673
if(ret == -1){
1674
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1675
strerror(errno));
1676
}
1677
free(fullname);
1678
}
1679
closedir(d);
1680
}
1681
ret = rmdir(tempdir);
1682
if(ret == -1 and errno != ENOENT){
1683
perror("rmdir");
1684
}
1685
}
1686
1687
if(quit_now){
1688
sigemptyset(&old_sigterm_action.sa_mask);
1689
old_sigterm_action.sa_handler = SIG_DFL;
1690
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1691
&old_sigterm_action,
1692
NULL));
1693
if(ret == -1){
1694
perror("sigaction");
1695
}
1696
do {
1697
ret = raise(signal_received);
1698
} while(ret != 0 and errno == EINTR);
1699
if(ret != 0){
1700
perror("raise");
1701
abort();
1702
}
1703
TEMP_FAILURE_RETRY(pause());
1704
}
1705
1706
return exitcode;
1052
1707
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0