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- Committer: Björn Påhlsson
- Date: 2011-11-14 19:10:50 UTC
- mto: (237.16.9 client-network-hooks)
- mto: This revision was merged to the branch mainline in revision 290.
- Revision ID: belorn@fukt.bsnet.se-20111114191050-g11po6084bl9j5kf
replace calls to fprintf with fprintf_plus.
- files added:
- .bzr-builddeb
- debian
- debian/po
- debian/source
- 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 © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
25
26
* along with this program. If not, see
26
27
* <http://www.gnu.org/licenses/>.
27
28
*
28
* Contact the authors at <mandos@fukt.bsnet.se>.
29
* Contact the authors at <mandos@recompile.se>.
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(), S_ISREG */
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
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
58
68
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
69
SIOCSIFFLAGS, if_indextoname(),
60
70
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
61
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
63
setgid() */
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
67
79
#include <argp.h> /* struct argp_option, error_t, struct
68
80
argp_state, struct argp,
69
81
argp_parse(), ARGP_KEY_ARG,
70
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
90
91
#ifdef __linux__
92
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
71
94
72
95
/* Avahi */
73
96
/* All Avahi types, constants and functions
86
109
gnutls_*
87
110
init_gnutls_session(),
88
111
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
112
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
91
115
92
116
/* GPGME */
93
117
#include <gpgme.h> /* All GPGME types, constants and
98
122
99
123
#define BUFFER_SIZE 256
100
124
125
#define PATHDIR "/conf/conf.d/mandos"
126
#define SECKEY "seckey.txt"
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
129
101
130
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
131
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
137
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
140
const char *ip;
141
uint16_t port;
142
AvahiIfIndex if_index;
143
int af;
144
struct timespec last_seen;
145
struct server *next;
146
struct server *prev;
147
} server;
106
148
107
149
/* Used for passing in values through the Avahi callback functions */
108
150
typedef struct {
112
154
unsigned int dh_bits;
113
155
gnutls_dh_params_t dh_params;
114
156
const char *priority;
157
gpgme_ctx_t ctx;
158
server *current_server;
115
159
} mandos_context;
116
160
161
/* global context so signal handler can reach it*/
162
mandos_context mc = { .simple_poll = NULL, .server = NULL,
163
.dh_bits = 1024, .priority = "SECURE256"
164
":!CTYPE-X.509:+CTYPE-OPENPGP",
165
.current_server = NULL };
166
167
sig_atomic_t quit_now = 0;
168
int signal_received = 0;
169
170
/* Function to use when printing errors */
171
void perror_plus(const char *print_text){
172
fprintf(stderr, "Mandos plugin %s: ",
173
program_invocation_short_name);
174
perror(print_text);
175
}
176
177
int fprintf_plus(FILE *stream, const char *format, ...){
178
va_list ap;
179
va_start (ap, format);
180
181
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ", program_invocation_short_name));
182
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
183
}
184
117
185
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
186
* Make additional room in "buffer" for at least BUFFER_SIZE more
187
* bytes. "buffer_capacity" is how much is currently allocated,
120
188
* "buffer_length" is how much is already used.
121
189
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
190
size_t incbuffer(char **buffer, size_t buffer_length,
191
size_t buffer_capacity){
192
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
193
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
194
if(buffer == NULL){
127
195
return 0;
128
196
}
129
197
buffer_capacity += BUFFER_SIZE;
131
199
return buffer_capacity;
132
200
}
133
201
202
/* Add server to set of servers to retry periodically */
203
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
204
int af){
205
int ret;
206
server *new_server = malloc(sizeof(server));
207
if(new_server == NULL){
208
perror_plus("malloc");
209
return -1;
210
}
211
*new_server = (server){ .ip = strdup(ip),
212
.port = port,
213
.if_index = if_index,
214
.af = af };
215
if(new_server->ip == NULL){
216
perror_plus("strdup");
217
return -1;
218
}
219
/* Special case of first server */
220
if (mc.current_server == NULL){
221
new_server->next = new_server;
222
new_server->prev = new_server;
223
mc.current_server = new_server;
224
/* Place the new server last in the list */
225
} else {
226
new_server->next = mc.current_server;
227
new_server->prev = mc.current_server->prev;
228
new_server->prev->next = new_server;
229
mc.current_server->prev = new_server;
230
}
231
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
232
if(ret == -1){
233
perror_plus("clock_gettime");
234
return -1;
235
}
236
return 0;
237
}
238
134
239
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
240
* Initialize GPGME.
137
241
*/
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;
242
static bool init_gpgme(const char *seckey, const char *pubkey,
243
const char *tempdir){
144
244
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
245
gpgme_engine_info_t engine_info;
149
246
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
247
248
/*
249
* Helper function to insert pub and seckey to the engine keyring.
250
*/
251
bool import_key(const char *filename){
252
int ret;
253
int fd;
254
gpgme_data_t pgp_data;
255
256
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
257
if(fd == -1){
258
perror_plus("open");
259
return false;
260
}
261
262
rc = gpgme_data_new_from_fd(&pgp_data, fd);
263
if(rc != GPG_ERR_NO_ERROR){
264
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
265
gpgme_strsource(rc), gpgme_strerror(rc));
266
return false;
267
}
268
269
rc = gpgme_op_import(mc.ctx, pgp_data);
270
if(rc != GPG_ERR_NO_ERROR){
271
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
272
gpgme_strsource(rc), gpgme_strerror(rc));
273
return false;
274
}
275
276
ret = (int)TEMP_FAILURE_RETRY(close(fd));
277
if(ret == -1){
278
perror_plus("close");
279
}
280
gpgme_data_release(pgp_data);
281
return true;
282
}
283
284
if(debug){
285
fprintf_plus(stderr, "Initializing GPGME\n");
152
286
}
153
287
154
288
/* Init GPGME */
155
289
gpgme_check_version(NULL);
156
290
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
291
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
293
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
294
return false;
161
295
}
162
296
163
297
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
298
rc = gpgme_get_engine_info(&engine_info);
299
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
301
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
302
return false;
169
303
}
170
304
while(engine_info != NULL){
171
305
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
306
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
307
engine_info->file_name, tempdir);
174
308
break;
175
309
}
176
310
engine_info = engine_info->next;
177
311
}
178
312
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
313
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n", tempdir);
314
return false;
315
}
316
317
/* Create new GPGME "context" */
318
rc = gpgme_new(&(mc.ctx));
319
if(rc != GPG_ERR_NO_ERROR){
320
fprintf_plus(stderr, "Mandos plugin mandos-client: "
321
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
322
gpgme_strerror(rc));
323
return false;
324
}
325
326
if(not import_key(pubkey) or not import_key(seckey)){
327
return false;
328
}
329
330
return true;
331
}
332
333
/*
334
* Decrypt OpenPGP data.
335
* Returns -1 on error
336
*/
337
static ssize_t pgp_packet_decrypt(const char *cryptotext,
338
size_t crypto_size,
339
char **plaintext){
340
gpgme_data_t dh_crypto, dh_plain;
341
gpgme_error_t rc;
342
ssize_t ret;
343
size_t plaintext_capacity = 0;
344
ssize_t plaintext_length = 0;
345
346
if(debug){
347
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
181
348
}
182
349
183
350
/* Create new GPGME data buffer from memory cryptotext */
184
351
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
352
0);
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
353
if(rc != GPG_ERR_NO_ERROR){
354
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
355
gpgme_strsource(rc), gpgme_strerror(rc));
189
356
return -1;
190
357
}
191
358
192
359
/* Create new empty GPGME data buffer for the plaintext */
193
360
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
361
if(rc != GPG_ERR_NO_ERROR){
362
fprintf_plus(stderr, "Mandos plugin mandos-client: "
363
"bad gpgme_data_new: %s: %s\n",
196
364
gpgme_strsource(rc), gpgme_strerror(rc));
197
365
gpgme_data_release(dh_crypto);
198
366
return -1;
199
367
}
200
368
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
369
/* Decrypt data from the cryptotext data buffer to the plaintext
211
370
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
371
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
372
if(rc != GPG_ERR_NO_ERROR){
373
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
374
gpgme_strsource(rc), gpgme_strerror(rc));
216
375
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){
376
if(debug){
377
gpgme_decrypt_result_t result;
378
result = gpgme_op_decrypt_result(mc.ctx);
379
if(result == NULL){
380
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
381
} else {
382
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
383
result->unsupported_algorithm);
384
fprintf_plus(stderr, "Wrong key usage: %u\n",
385
result->wrong_key_usage);
386
if(result->file_name != NULL){
387
fprintf_plus(stderr, "File name: %s\n", result->file_name);
388
}
389
gpgme_recipient_t recipient;
390
recipient = result->recipients;
240
391
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
392
fprintf_plus(stderr, "Public key algorithm: %s\n",
242
393
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
394
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
395
fprintf_plus(stderr, "Secret key available: %s\n",
245
396
recipient->status == GPG_ERR_NO_SECKEY
246
397
? "No" : "Yes");
247
398
recipient = recipient->next;
248
399
}
249
400
}
250
401
}
402
goto decrypt_end;
403
}
404
405
if(debug){
406
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
251
407
}
252
408
253
409
/* 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");
410
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
411
perror_plus("gpgme_data_seek");
256
412
plaintext_length = -1;
257
413
goto decrypt_end;
258
414
}
259
415
260
416
*plaintext = NULL;
261
417
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
264
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
268
goto decrypt_end;
418
plaintext_capacity = incbuffer(plaintext,
419
(size_t)plaintext_length,
420
plaintext_capacity);
421
if(plaintext_capacity == 0){
422
perror_plus("incbuffer");
423
plaintext_length = -1;
424
goto decrypt_end;
269
425
}
270
426
271
427
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
428
BUFFER_SIZE);
273
429
/* Print the data, if any */
274
if (ret == 0){
430
if(ret == 0){
275
431
/* EOF */
276
432
break;
277
433
}
278
434
if(ret < 0){
279
perror("gpgme_data_read");
435
perror_plus("gpgme_data_read");
280
436
plaintext_length = -1;
281
437
goto decrypt_end;
282
438
}
283
439
plaintext_length += ret;
284
440
}
285
441
286
442
if(debug){
287
fprintf(stderr, "Decrypted password is: ");
443
fprintf_plus(stderr, "Decrypted password is: ");
288
444
for(ssize_t i = 0; i < plaintext_length; i++){
289
445
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
290
446
}
301
457
return plaintext_length;
302
458
}
303
459
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
460
static const char * safer_gnutls_strerror(int value){
461
const char *ret = gnutls_strerror(value); /* Spurious warning from
462
-Wunreachable-code */
463
if(ret == NULL)
307
464
ret = "(unknown)";
308
465
return ret;
309
466
}
311
468
/* GnuTLS log function callback */
312
469
static void debuggnutls(__attribute__((unused)) int level,
313
470
const char* string){
314
fprintf(stderr, "GnuTLS: %s", string);
471
fprintf_plus(stderr, "GnuTLS: %s", string);
315
472
}
316
473
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
474
static int init_gnutls_global(const char *pubkeyfilename,
319
475
const char *seckeyfilename){
320
476
int ret;
321
477
322
478
if(debug){
323
fprintf(stderr, "Initializing GnuTLS\n");
479
fprintf_plus(stderr, "Initializing GnuTLS\n");
324
480
}
325
481
326
482
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
483
if(ret != GNUTLS_E_SUCCESS){
484
fprintf_plus(stderr, "GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));
330
485
return -1;
331
486
}
332
487
333
if (debug){
488
if(debug){
334
489
/* "Use a log level over 10 to enable all debugging options."
335
490
* - GnuTLS manual
336
491
*/
339
494
}
340
495
341
496
/* 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 ();
497
ret = gnutls_certificate_allocate_credentials(&mc.cred);
498
if(ret != GNUTLS_E_SUCCESS){
499
fprintf_plus(stderr, "GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));
500
gnutls_global_deinit();
348
501
return -1;
349
502
}
350
503
351
504
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
505
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
506
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
354
507
seckeyfilename);
355
508
}
356
509
357
510
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
511
(mc.cred, pubkeyfilename, seckeyfilename,
359
512
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
361
fprintf(stderr,
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
365
safer_gnutls_strerror(ret));
513
if(ret != GNUTLS_E_SUCCESS){
514
fprintf_plus(stderr,
515
"Error[%d] while reading the OpenPGP key pair ('%s',"
516
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
517
fprintf_plus(stderr, "The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));
366
518
goto globalfail;
367
519
}
368
520
369
521
/* 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
522
ret = gnutls_dh_params_init(&mc.dh_params);
523
if(ret != GNUTLS_E_SUCCESS){
524
fprintf_plus(stderr, "Error in GnuTLS DH parameter initialization:"
525
" %s\n", safer_gnutls_strerror(ret));
526
goto globalfail;
527
}
528
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
529
if(ret != GNUTLS_E_SUCCESS){
530
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
531
safer_gnutls_strerror(ret));
532
goto globalfail;
533
}
534
535
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
536
385
537
return 0;
386
538
387
539
globalfail:
388
389
gnutls_certificate_free_credentials(mc->cred);
540
541
gnutls_certificate_free_credentials(mc.cred);
390
542
gnutls_global_deinit();
543
gnutls_dh_params_deinit(mc.dh_params);
391
544
return -1;
392
393
545
}
394
546
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
547
static int init_gnutls_session(gnutls_session_t *session){
397
548
int ret;
398
549
/* GnuTLS session creation */
399
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
550
do {
551
ret = gnutls_init(session, GNUTLS_SERVER);
552
if(quit_now){
553
return -1;
554
}
555
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
556
if(ret != GNUTLS_E_SUCCESS){
557
fprintf_plus(stderr, "Error in GnuTLS session initialization: %s\n",
402
558
safer_gnutls_strerror(ret));
403
559
}
404
560
405
561
{
406
562
const char *err;
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
409
fprintf(stderr, "Syntax error at: %s\n", err);
410
fprintf(stderr, "GnuTLS error: %s\n",
411
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
563
do {
564
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
565
if(quit_now){
566
gnutls_deinit(*session);
567
return -1;
568
}
569
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Syntax error at: %s\n", err);
572
fprintf_plus(stderr, "GnuTLS error: %s\n", safer_gnutls_strerror(ret));
573
gnutls_deinit(*session);
413
574
return -1;
414
575
}
415
576
}
416
577
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
do {
579
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
580
mc.cred);
581
if(quit_now){
582
gnutls_deinit(*session);
583
return -1;
584
}
585
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
586
if(ret != GNUTLS_E_SUCCESS){
587
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
421
588
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
589
gnutls_deinit(*session);
423
590
return -1;
424
591
}
425
592
426
593
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
594
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
429
595
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
596
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
431
597
432
598
return 0;
433
599
}
439
605
/* Called when a Mandos server is found */
440
606
static int start_mandos_communication(const char *ip, uint16_t port,
441
607
AvahiIfIndex if_index,
442
mandos_context *mc){
443
int ret, tcp_sd;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
608
int af){
609
int ret, tcp_sd = -1;
610
ssize_t sret;
611
union {
612
struct sockaddr_in in;
613
struct sockaddr_in6 in6;
614
} to;
445
615
char *buffer = NULL;
446
char *decrypted_buffer;
616
char *decrypted_buffer = NULL;
447
617
size_t buffer_length = 0;
448
618
size_t buffer_capacity = 0;
449
ssize_t decrypted_buffer_size;
450
619
size_t written;
451
int retval = 0;
452
char interface[IF_NAMESIZE];
620
int retval = -1;
453
621
gnutls_session_t session;
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
622
int pf; /* Protocol family */
623
624
errno = 0;
625
626
if(quit_now){
627
errno = EINTR;
628
return -1;
629
}
630
631
switch(af){
632
case AF_INET6:
633
pf = PF_INET6;
634
break;
635
case AF_INET:
636
pf = PF_INET;
637
break;
638
default:
639
fprintf_plus(stderr, "Bad address family: %d\n", af);
640
errno = EINVAL;
641
return -1;
642
}
643
644
ret = init_gnutls_session(&session);
645
if(ret != 0){
457
646
return -1;
458
647
}
459
648
460
649
if(debug){
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
650
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %" PRIu16
462
651
"\n", ip, port);
463
652
}
464
653
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
466
if(tcp_sd < 0) {
467
perror("socket");
468
return -1;
654
tcp_sd = socket(pf, SOCK_STREAM, 0);
655
if(tcp_sd < 0){
656
int e = errno;
657
perror_plus("socket");
658
errno = e;
659
goto mandos_end;
469
660
}
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);
661
662
if(quit_now){
663
errno = EINTR;
664
goto mandos_end;
477
665
}
478
666
479
667
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 ){
485
perror("inet_pton");
486
return -1;
668
if(af == AF_INET6){
669
to.in6.sin6_family = (sa_family_t)af;
670
ret = inet_pton(af, ip, &to.in6.sin6_addr);
671
} else { /* IPv4 */
672
to.in.sin_family = (sa_family_t)af;
673
ret = inet_pton(af, ip, &to.in.sin_addr);
674
}
675
if(ret < 0 ){
676
int e = errno;
677
perror_plus("inet_pton");
678
errno = e;
679
goto mandos_end;
487
680
}
488
681
if(ret == 0){
489
fprintf(stderr, "Bad address: %s\n", ip);
490
return -1;
491
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
682
int e = errno;
683
fprintf_plus(stderr, "Bad address: %s\n", ip);
684
errno = e;
685
goto mandos_end;
686
}
687
if(af == AF_INET6){
688
to.in6.sin6_port = htons(port); /* Spurious warnings from
689
-Wconversion and
690
-Wunreachable-code */
691
692
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
693
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
694
-Wunreachable-code*/
695
if(if_index == AVAHI_IF_UNSPEC){
696
fprintf_plus(stderr, "An IPv6 link-local address is incomplete"
697
" without a network interface\n");
698
errno = EINVAL;
699
goto mandos_end;
700
}
701
/* Set the network interface number as scope */
702
to.in6.sin6_scope_id = (uint32_t)if_index;
703
}
704
} else {
705
to.in.sin_port = htons(port); /* Spurious warnings from
706
-Wconversion and
707
-Wunreachable-code */
708
}
493
709
494
to.in6.sin6_scope_id = (uint32_t)if_index;
710
if(quit_now){
711
errno = EINTR;
712
goto mandos_end;
713
}
495
714
496
715
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){
502
perror("inet_ntop");
716
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
717
char interface[IF_NAMESIZE];
718
if(if_indextoname((unsigned int)if_index, interface) == NULL){
719
perror_plus("if_indextoname");
720
} else {
721
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
722
ip, interface, port);
723
}
724
} else {
725
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n", ip, port);
726
}
727
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
728
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
729
const char *pcret;
730
if(af == AF_INET6){
731
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
732
sizeof(addrstr));
733
} else {
734
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
735
sizeof(addrstr));
736
}
737
if(pcret == NULL){
738
perror_plus("inet_ntop");
503
739
} else {
504
740
if(strcmp(addrstr, ip) != 0){
505
fprintf(stderr, "Canonical address form: %s\n", addrstr);
741
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
506
742
}
507
743
}
508
744
}
509
745
510
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
512
perror("connect");
513
return -1;
514
}
515
746
if(quit_now){
747
errno = EINTR;
748
goto mandos_end;
749
}
750
751
if(af == AF_INET6){
752
ret = connect(tcp_sd, &to.in6, sizeof(to));
753
} else {
754
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
755
}
756
if(ret < 0){
757
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
758
int e = errno;
759
perror_plus("connect");
760
errno = e;
761
}
762
goto mandos_end;
763
}
764
765
if(quit_now){
766
errno = EINTR;
767
goto mandos_end;
768
}
769
516
770
const char *out = mandos_protocol_version;
517
771
written = 0;
518
while (true){
772
while(true){
519
773
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
out_size - written));
522
if (ret == -1){
523
perror("write");
524
retval = -1;
774
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
775
out_size - written));
776
if(ret == -1){
777
int e = errno;
778
perror_plus("write");
779
errno = e;
525
780
goto mandos_end;
526
781
}
527
782
written += (size_t)ret;
528
783
if(written < out_size){
529
784
continue;
530
785
} else {
531
if (out == mandos_protocol_version){
786
if(out == mandos_protocol_version){
532
787
written = 0;
533
788
out = "\r\n";
534
789
} else {
535
790
break;
536
791
}
537
792
}
793
794
if(quit_now){
795
errno = EINTR;
796
goto mandos_end;
797
}
538
798
}
539
799
540
800
if(debug){
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
}
543
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
546
do{
547
ret = gnutls_handshake (session);
801
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
802
}
803
804
if(quit_now){
805
errno = EINTR;
806
goto mandos_end;
807
}
808
809
/* Spurious warning from -Wint-to-pointer-cast */
810
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
811
812
if(quit_now){
813
errno = EINTR;
814
goto mandos_end;
815
}
816
817
do {
818
ret = gnutls_handshake(session);
819
if(quit_now){
820
errno = EINTR;
821
goto mandos_end;
822
}
548
823
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
824
550
if (ret != GNUTLS_E_SUCCESS){
825
if(ret != GNUTLS_E_SUCCESS){
551
826
if(debug){
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
553
gnutls_perror (ret);
827
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
828
gnutls_perror(ret);
554
829
}
555
retval = -1;
830
errno = EPROTO;
556
831
goto mandos_end;
557
832
}
558
833
559
834
/* Read OpenPGP packet that contains the wanted password */
560
835
561
836
if(debug){
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
563
ip);
837
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from %s\n", ip);
564
838
}
565
839
566
840
while(true){
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
568
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){
841
842
if(quit_now){
843
errno = EINTR;
844
goto mandos_end;
845
}
846
847
buffer_capacity = incbuffer(&buffer, buffer_length,
848
buffer_capacity);
849
if(buffer_capacity == 0){
850
int e = errno;
851
perror_plus("incbuffer");
852
errno = e;
853
goto mandos_end;
854
}
855
856
if(quit_now){
857
errno = EINTR;
858
goto mandos_end;
859
}
860
861
sret = gnutls_record_recv(session, buffer+buffer_length,
862
BUFFER_SIZE);
863
if(sret == 0){
578
864
break;
579
865
}
580
if (ret < 0){
581
switch(ret){
866
if(sret < 0){
867
switch(sret){
582
868
case GNUTLS_E_INTERRUPTED:
583
869
case GNUTLS_E_AGAIN:
584
870
break;
585
871
case GNUTLS_E_REHANDSHAKE:
586
do{
587
ret = gnutls_handshake (session);
872
do {
873
ret = gnutls_handshake(session);
874
875
if(quit_now){
876
errno = EINTR;
877
goto mandos_end;
878
}
588
879
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
if (ret < 0){
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
591
gnutls_perror (ret);
592
retval = -1;
880
if(ret < 0){
881
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed ***\n");
882
gnutls_perror(ret);
883
errno = EPROTO;
593
884
goto mandos_end;
594
885
}
595
886
break;
596
887
default:
597
fprintf(stderr, "Unknown error while reading data from"
888
fprintf_plus(stderr, "Unknown error while reading data from"
598
889
" encrypted session with Mandos server\n");
599
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
890
gnutls_bye(session, GNUTLS_SHUT_RDWR);
891
errno = EIO;
601
892
goto mandos_end;
602
893
}
603
894
} else {
604
buffer_length += (size_t) ret;
895
buffer_length += (size_t) sret;
605
896
}
606
897
}
607
898
608
899
if(debug){
609
fprintf(stderr, "Closing TLS session\n");
610
}
611
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
613
614
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
616
buffer_length,
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
900
fprintf_plus(stderr, "Closing TLS session\n");
901
}
902
903
if(quit_now){
904
errno = EINTR;
905
goto mandos_end;
906
}
907
908
do {
909
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
910
if(quit_now){
911
errno = EINTR;
912
goto mandos_end;
913
}
914
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
915
916
if(buffer_length > 0){
917
ssize_t decrypted_buffer_size;
918
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
919
&decrypted_buffer);
920
if(decrypted_buffer_size >= 0){
921
620
922
written = 0;
621
923
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
924
if(quit_now){
925
errno = EINTR;
926
goto mandos_end;
927
}
928
929
ret = (int)fwrite(decrypted_buffer + written, 1,
930
(size_t)decrypted_buffer_size - written,
931
stdout);
625
932
if(ret == 0 and ferror(stdout)){
933
int e = errno;
626
934
if(debug){
627
fprintf(stderr, "Error writing encrypted data: %s\n",
935
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
628
936
strerror(errno));
629
937
}
630
retval = -1;
631
break;
938
errno = e;
939
goto mandos_end;
632
940
}
633
941
written += (size_t)ret;
634
942
}
635
free(decrypted_buffer);
636
} else {
637
retval = -1;
943
retval = 0;
638
944
}
639
945
}
640
946
641
947
/* Shutdown procedure */
642
948
643
949
mandos_end:
644
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
950
{
951
int e = errno;
952
free(decrypted_buffer);
953
free(buffer);
954
if(tcp_sd >= 0){
955
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
956
}
957
if(ret == -1){
958
if(e == 0){
959
e = errno;
960
}
961
perror_plus("close");
962
}
963
gnutls_deinit(session);
964
errno = e;
965
if(quit_now){
966
errno = EINTR;
967
retval = -1;
968
}
969
}
647
970
return retval;
648
971
}
649
972
650
973
static void resolve_callback(AvahiSServiceResolver *r,
651
974
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
975
AvahiProtocol proto,
653
976
AvahiResolverEvent event,
654
977
const char *name,
655
978
const char *type,
660
983
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
984
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
985
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
986
AVAHI_GCC_UNUSED void* userdata){
665
987
assert(r);
666
988
667
989
/* Called whenever a service has been resolved successfully or
668
990
timed out */
669
991
670
switch (event) {
992
if(quit_now){
993
return;
994
}
995
996
switch(event){
671
997
default:
672
998
case AVAHI_RESOLVER_FAILURE:
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
999
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
1000
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
1001
avahi_strerror(avahi_server_errno(mc.server)));
676
1002
break;
677
1003
678
1004
case AVAHI_RESOLVER_FOUND:
680
1006
char ip[AVAHI_ADDRESS_STR_MAX];
681
1007
avahi_address_snprint(ip, sizeof(ip), address);
682
1008
if(debug){
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
1009
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1010
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1011
ip, (intmax_t)interface, port);
686
1012
}
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
1013
int ret = start_mandos_communication(ip, port, interface,
1014
avahi_proto_to_af(proto));
1015
if(ret == 0){
1016
avahi_simple_poll_quit(mc.simple_poll);
1017
} else {
1018
ret = add_server(ip, port, interface,
1019
avahi_proto_to_af(proto));
690
1020
}
691
1021
}
692
1022
}
693
1023
avahi_s_service_resolver_free(r);
694
1024
}
695
1025
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;
1026
static void browse_callback(AvahiSServiceBrowser *b,
1027
AvahiIfIndex interface,
1028
AvahiProtocol protocol,
1029
AvahiBrowserEvent event,
1030
const char *name,
1031
const char *type,
1032
const char *domain,
1033
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1034
flags,
1035
AVAHI_GCC_UNUSED void* userdata){
707
1036
assert(b);
708
1037
709
1038
/* Called whenever a new services becomes available on the LAN or
710
1039
is removed from the LAN */
711
1040
712
switch (event) {
1041
if(quit_now){
1042
return;
1043
}
1044
1045
switch(event){
713
1046
default:
714
1047
case AVAHI_BROWSER_FAILURE:
715
1048
716
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
1049
fprintf_plus(stderr, "(Avahi browser) %s\n",
1050
avahi_strerror(avahi_server_errno(mc.server)));
1051
avahi_simple_poll_quit(mc.simple_poll);
719
1052
return;
720
1053
721
1054
case AVAHI_BROWSER_NEW:
724
1057
the callback function is called the Avahi server will free the
725
1058
resolver for us. */
726
1059
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
1060
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1061
name, type, domain, protocol, 0,
1062
resolve_callback, NULL) == NULL)
1063
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1064
name, avahi_strerror(avahi_server_errno(mc.server)));
733
1065
break;
734
1066
735
1067
case AVAHI_BROWSER_REMOVE:
738
1070
case AVAHI_BROWSER_ALL_FOR_NOW:
739
1071
case AVAHI_BROWSER_CACHE_EXHAUSTED:
740
1072
if(debug){
741
fprintf(stderr, "No Mandos server found, still searching...\n");
1073
fprintf_plus(stderr, "No Mandos server found, still searching...\n");
742
1074
}
743
1075
break;
744
1076
}
745
1077
}
746
1078
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){
1079
/* Signal handler that stops main loop after SIGTERM */
1080
static void handle_sigterm(int sig){
1081
if(quit_now){
1082
return;
1083
}
1084
quit_now = 1;
1085
signal_received = sig;
1086
int old_errno = errno;
1087
/* set main loop to exit */
1088
if(mc.simple_poll != NULL){
1089
avahi_simple_poll_quit(mc.simple_poll);
1090
}
1091
errno = old_errno;
1092
}
1093
1094
bool get_flags(const char *ifname, struct ifreq *ifr){
1095
int ret;
1096
1097
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1098
if(s < 0){
1099
perror_plus("socket");
1100
return false;
1101
}
1102
strcpy(ifr->ifr_name, ifname);
1103
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1104
if(ret == -1){
1105
if(debug){
1106
perror_plus("ioctl SIOCGIFFLAGS");
1107
}
1108
return false;
1109
}
1110
return true;
1111
}
1112
1113
bool good_flags(const char *ifname, const struct ifreq *ifr){
1114
1115
/* Reject the loopback device */
1116
if(ifr->ifr_flags & IFF_LOOPBACK){
1117
if(debug){
1118
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n", ifname);
1119
}
1120
return false;
1121
}
1122
/* Accept point-to-point devices only if connect_to is specified */
1123
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1124
if(debug){
1125
fprintf_plus(stderr, "Accepting point-to-point interface \"%s\"\n", ifname);
1126
}
1127
return true;
1128
}
1129
/* Otherwise, reject non-broadcast-capable devices */
1130
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1131
if(debug){
1132
fprintf_plus(stderr, "Rejecting non-broadcast interface \"%s\"\n", ifname);
1133
}
1134
return false;
1135
}
1136
/* Reject non-ARP interfaces (including dummy interfaces) */
1137
if(ifr->ifr_flags & IFF_NOARP){
1138
if(debug){
1139
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n", ifname);
1140
}
1141
return false;
1142
}
1143
1144
/* Accept this device */
1145
if(debug){
1146
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1147
}
1148
return true;
1149
}
1150
1151
/*
1152
* This function determines if a directory entry in /sys/class/net
1153
* corresponds to an acceptable network device.
1154
* (This function is passed to scandir(3) as a filter function.)
1155
*/
1156
int good_interface(const struct dirent *if_entry){
1157
if(if_entry->d_name[0] == '.'){
1158
return 0;
1159
}
1160
1161
struct ifreq ifr;
1162
if(not get_flags(if_entry->d_name, &ifr)){
1163
if(debug){
1164
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1165
if_entry->d_name);
1166
}
1167
return 0;
1168
}
1169
1170
if(not good_flags(if_entry->d_name, &ifr)){
1171
return 0;
1172
}
1173
return 1;
1174
}
1175
1176
/*
1177
* This function determines if a directory entry in /sys/class/net
1178
* corresponds to an acceptable network device which is up.
1179
* (This function is passed to scandir(3) as a filter function.)
1180
*/
1181
int up_interface(const struct dirent *if_entry){
1182
if(if_entry->d_name[0] == '.'){
1183
return 0;
1184
}
1185
1186
struct ifreq ifr;
1187
if(not get_flags(if_entry->d_name, &ifr)){
1188
if(debug){
1189
fprintf_plus(stderr, "Failed to get flags for interface \"%s\"\n",
1190
if_entry->d_name);
1191
}
1192
return 0;
1193
}
1194
1195
/* Reject down interfaces */
1196
if(not (ifr.ifr_flags & IFF_UP)){
1197
if(debug){
1198
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1199
if_entry->d_name);
1200
}
1201
return 0;
1202
}
1203
1204
/* Reject non-running interfaces */
1205
if(not (ifr.ifr_flags & IFF_RUNNING)){
1206
if(debug){
1207
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1208
if_entry->d_name);
1209
}
1210
return 0;
1211
}
1212
1213
if(not good_flags(if_entry->d_name, &ifr)){
1214
return 0;
1215
}
1216
return 1;
1217
}
1218
1219
int notdotentries(const struct dirent *direntry){
1220
/* Skip "." and ".." */
1221
if(direntry->d_name[0] == '.'
1222
and (direntry->d_name[1] == '\0'
1223
or (direntry->d_name[1] == '.'
1224
and direntry->d_name[2] == '\0'))){
1225
return 0;
1226
}
1227
return 1;
1228
}
1229
1230
/* Is this directory entry a runnable program? */
1231
int runnable_hook(const struct dirent *direntry){
1232
int ret;
1233
size_t sret;
1234
struct stat st;
1235
1236
if((direntry->d_name)[0] == '\0'){
1237
/* Empty name? */
1238
return 0;
1239
}
1240
1241
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1242
"abcdefghijklmnopqrstuvwxyz"
1243
"0123456789"
1244
"_-");
1245
if((direntry->d_name)[sret] != '\0'){
1246
/* Contains non-allowed characters */
1247
if(debug){
1248
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1249
direntry->d_name);
1250
}
1251
return 0;
1252
}
1253
1254
char *fullname = NULL;
1255
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1256
if(ret < 0){
1257
perror_plus("asprintf");
1258
return 0;
1259
}
1260
1261
ret = stat(fullname, &st);
1262
if(ret == -1){
1263
if(debug){
1264
perror_plus("Could not stat hook");
1265
}
1266
return 0;
1267
}
1268
if(not (S_ISREG(st.st_mode))){
1269
/* Not a regular file */
1270
if(debug){
1271
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1272
direntry->d_name);
1273
}
1274
return 0;
1275
}
1276
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1277
/* Not executable */
1278
if(debug){
1279
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1280
direntry->d_name);
1281
}
1282
return 0;
1283
}
1284
return 1;
1285
}
1286
1287
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1288
int ret;
1289
struct timespec now;
1290
struct timespec waited_time;
1291
intmax_t block_time;
1292
1293
while(true){
1294
if(mc.current_server == NULL){
1295
if (debug){
1296
fprintf_plus(stderr, "Wait until first server is found. No timeout!\n");
1297
}
1298
ret = avahi_simple_poll_iterate(s, -1);
1299
} else {
1300
if (debug){
1301
fprintf_plus(stderr, "Check current_server if we should run it,"
1302
" or wait\n");
1303
}
1304
/* the current time */
1305
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1306
if(ret == -1){
1307
perror_plus("clock_gettime");
1308
return -1;
1309
}
1310
/* Calculating in ms how long time between now and server
1311
who we visted longest time ago. Now - last seen. */
1312
waited_time.tv_sec = (now.tv_sec
1313
- mc.current_server->last_seen.tv_sec);
1314
waited_time.tv_nsec = (now.tv_nsec
1315
- mc.current_server->last_seen.tv_nsec);
1316
/* total time is 10s/10,000ms.
1317
Converting to s from ms by dividing by 1,000,
1318
and ns to ms by dividing by 1,000,000. */
1319
block_time = ((retry_interval
1320
- ((intmax_t)waited_time.tv_sec * 1000))
1321
- ((intmax_t)waited_time.tv_nsec / 1000000));
1322
1323
if (debug){
1324
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n", block_time);
1325
}
1326
1327
if(block_time <= 0){
1328
ret = start_mandos_communication(mc.current_server->ip,
1329
mc.current_server->port,
1330
mc.current_server->if_index,
1331
mc.current_server->af);
1332
if(ret == 0){
1333
avahi_simple_poll_quit(mc.simple_poll);
1334
return 0;
1335
}
1336
ret = clock_gettime(CLOCK_MONOTONIC,
1337
&mc.current_server->last_seen);
1338
if(ret == -1){
1339
perror_plus("clock_gettime");
1340
return -1;
1341
}
1342
mc.current_server = mc.current_server->next;
1343
block_time = 0; /* Call avahi to find new Mandos
1344
servers, but don't block */
1345
}
1346
1347
ret = avahi_simple_poll_iterate(s, (int)block_time);
1348
}
1349
if(ret != 0){
1350
if (ret > 0 or errno != EINTR){
1351
return (ret != 1) ? ret : 0;
1352
}
1353
}
1354
}
1355
}
1356
1357
int main(int argc, char *argv[]){
1358
AvahiSServiceBrowser *sb = NULL;
1359
int error;
1360
int ret;
1361
intmax_t tmpmax;
750
1362
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;
1363
int exitcode = EXIT_SUCCESS;
1364
const char *interface = "";
1365
struct ifreq network;
1366
int sd = -1;
1367
bool take_down_interface = false;
1368
uid_t uid;
1369
gid_t gid;
1370
char tempdir[] = "/tmp/mandosXXXXXX";
1371
bool tempdir_created = false;
1372
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1373
const char *seckey = PATHDIR "/" SECKEY;
1374
const char *pubkey = PATHDIR "/" PUBKEY;
1375
1376
bool gnutls_initialized = false;
1377
bool gpgme_initialized = false;
1378
float delay = 2.5f;
1379
double retry_interval = 10; /* 10s between trying a server and
1380
retrying the same server again */
1381
1382
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1383
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1384
1385
uid = getuid();
1386
gid = getgid();
1387
1388
/* Lower any group privileges we might have, just to be safe */
1389
errno = 0;
1390
ret = setgid(gid);
1391
if(ret == -1){
1392
perror_plus("setgid");
1393
}
1394
1395
/* Lower user privileges (temporarily) */
1396
errno = 0;
1397
ret = seteuid(uid);
1398
if(ret == -1){
1399
perror_plus("seteuid");
1400
}
1401
1402
if(quit_now){
1403
goto end;
1404
}
1405
1406
{
1407
struct argp_option options[] = {
1408
{ .name = "debug", .key = 128,
1409
.doc = "Debug mode", .group = 3 },
1410
{ .name = "connect", .key = 'c',
1411
.arg = "ADDRESS:PORT",
1412
.doc = "Connect directly to a specific Mandos server",
1413
.group = 1 },
1414
{ .name = "interface", .key = 'i',
1415
.arg = "NAME",
1416
.doc = "Network interface that will be used to search for"
1417
" Mandos servers",
1418
.group = 1 },
1419
{ .name = "seckey", .key = 's',
1420
.arg = "FILE",
1421
.doc = "OpenPGP secret key file base name",
1422
.group = 1 },
1423
{ .name = "pubkey", .key = 'p',
1424
.arg = "FILE",
1425
.doc = "OpenPGP public key file base name",
1426
.group = 2 },
1427
{ .name = "dh-bits", .key = 129,
1428
.arg = "BITS",
1429
.doc = "Bit length of the prime number used in the"
1430
" Diffie-Hellman key exchange",
1431
.group = 2 },
1432
{ .name = "priority", .key = 130,
1433
.arg = "STRING",
1434
.doc = "GnuTLS priority string for the TLS handshake",
1435
.group = 1 },
1436
{ .name = "delay", .key = 131,
1437
.arg = "SECONDS",
1438
.doc = "Maximum delay to wait for interface startup",
1439
.group = 2 },
1440
{ .name = "retry", .key = 132,
1441
.arg = "SECONDS",
1442
.doc = "Retry interval used when denied by the mandos server",
1443
.group = 2 },
1444
{ .name = "network-hook-dir", .key = 133,
1445
.arg = "DIR",
1446
.doc = "Directory where network hooks are located",
1447
.group = 2 },
1448
/*
1449
* These reproduce what we would get without ARGP_NO_HELP
1450
*/
1451
{ .name = "help", .key = '?',
1452
.doc = "Give this help list", .group = -1 },
1453
{ .name = "usage", .key = -3,
1454
.doc = "Give a short usage message", .group = -1 },
1455
{ .name = "version", .key = 'V',
1456
.doc = "Print program version", .group = -1 },
1457
{ .name = NULL }
1458
};
1459
1460
error_t parse_opt(int key, char *arg,
1461
struct argp_state *state){
1462
errno = 0;
1463
switch(key){
1464
case 128: /* --debug */
1465
debug = true;
1466
break;
1467
case 'c': /* --connect */
1468
connect_to = arg;
1469
break;
1470
case 'i': /* --interface */
1471
interface = arg;
1472
break;
1473
case 's': /* --seckey */
1474
seckey = arg;
1475
break;
1476
case 'p': /* --pubkey */
1477
pubkey = arg;
1478
break;
1479
case 129: /* --dh-bits */
1480
errno = 0;
1481
tmpmax = strtoimax(arg, &tmp, 10);
1482
if(errno != 0 or tmp == arg or *tmp != '\0'
1483
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1484
argp_error(state, "Bad number of DH bits");
1485
}
1486
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1487
break;
1488
case 130: /* --priority */
1489
mc.priority = arg;
1490
break;
1491
case 131: /* --delay */
1492
errno = 0;
1493
delay = strtof(arg, &tmp);
1494
if(errno != 0 or tmp == arg or *tmp != '\0'){
1495
argp_error(state, "Bad delay");
1496
}
1497
case 132: /* --retry */
1498
errno = 0;
1499
retry_interval = strtod(arg, &tmp);
1500
if(errno != 0 or tmp == arg or *tmp != '\0'
1501
or (retry_interval * 1000) > INT_MAX
1502
or retry_interval < 0){
1503
argp_error(state, "Bad retry interval");
1504
}
1505
break;
1506
case 133: /* --network-hook-dir */
1507
hookdir = arg;
1508
break;
1509
/*
1510
* These reproduce what we would get without ARGP_NO_HELP
1511
*/
1512
case '?': /* --help */
1513
argp_state_help(state, state->out_stream,
1514
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1515
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1516
case -3: /* --usage */
1517
argp_state_help(state, state->out_stream,
1518
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1519
case 'V': /* --version */
1520
fprintf_plus(state->out_stream, "Mandos plugin mandos-client: ");
1521
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1522
exit(argp_err_exit_status);
1523
break;
1524
default:
1525
return ARGP_ERR_UNKNOWN;
1526
}
1527
return errno;
1528
}
1529
1530
struct argp argp = { .options = options, .parser = parse_opt,
1531
.args_doc = "",
1532
.doc = "Mandos client -- Get and decrypt"
1533
" passwords from a Mandos server" };
1534
ret = argp_parse(&argp, argc, argv,
1535
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1536
switch(ret){
1537
case 0:
1538
break;
1539
case ENOMEM:
1540
default:
1541
errno = ret;
1542
perror_plus("argp_parse");
1543
exitcode = EX_OSERR;
1544
goto end;
1545
case EINVAL:
1546
exitcode = EX_USAGE;
1547
goto end;
1548
}
1549
}
1550
1551
{
1552
/* Work around Debian bug #633582:
1553
<http://bugs.debian.org/633582> */
1554
struct stat st;
1555
1556
/* Re-raise priviliges */
1557
errno = 0;
1558
ret = seteuid(0);
1559
if(ret == -1){
1560
perror_plus("seteuid");
1561
}
1562
1563
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1564
int seckey_fd = open(seckey, O_RDONLY);
1565
if(seckey_fd == -1){
1566
perror_plus("open");
1567
} else {
1568
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1569
if(ret == -1){
1570
perror_plus("fstat");
1571
} else {
1572
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1573
ret = fchown(seckey_fd, uid, gid);
1574
if(ret == -1){
1575
perror_plus("fchown");
1576
}
1577
}
1578
}
1579
TEMP_FAILURE_RETRY(close(seckey_fd));
1580
}
1581
}
1582
1583
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1584
int pubkey_fd = open(pubkey, O_RDONLY);
1585
if(pubkey_fd == -1){
1586
perror_plus("open");
1587
} else {
1588
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1589
if(ret == -1){
1590
perror_plus("fstat");
1591
} else {
1592
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1593
ret = fchown(pubkey_fd, uid, gid);
1594
if(ret == -1){
1595
perror_plus("fchown");
1596
}
1597
}
1598
}
1599
TEMP_FAILURE_RETRY(close(pubkey_fd));
1600
}
1601
}
1602
1603
/* Lower privileges */
1604
errno = 0;
1605
ret = seteuid(uid);
1606
if(ret == -1){
1607
perror_plus("seteuid");
1608
}
1609
}
1610
1611
/* Find network hooks and run them */
1612
{
1613
struct dirent **direntries;
1614
struct dirent *direntry;
1615
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1616
alphasort);
1617
if(numhooks == -1){
1618
perror_plus("scandir");
889
1619
} 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;
1620
int devnull = open("/dev/null", O_RDONLY);
1621
for(int i = 0; i < numhooks; i++){
1622
direntry = direntries[0];
1623
char *fullname = NULL;
1624
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1625
if(ret < 0){
1626
perror_plus("asprintf");
1627
continue;
1628
}
1629
pid_t hook_pid = fork();
1630
if(hook_pid == 0){
1631
/* Child */
1632
dup2(devnull, STDIN_FILENO);
1633
close(devnull);
1634
dup2(STDERR_FILENO, STDOUT_FILENO);
1635
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1636
if(ret == -1){
1637
perror_plus("setenv");
1638
exit(1);
1639
}
1640
ret = setenv("DEVICE", interface, 1);
1641
if(ret == -1){
1642
perror_plus("setenv");
1643
exit(1);
1644
}
1645
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1646
if(ret == -1){
1647
perror_plus("setenv");
1648
exit(1);
1649
}
1650
ret = setenv("MODE", "start", 1);
1651
if(ret == -1){
1652
perror_plus("setenv");
1653
exit(1);
1654
}
1655
char *delaystring;
1656
ret = asprintf(&delaystring, "%f", delay);
1657
if(ret == -1){
1658
perror_plus("asprintf");
1659
exit(1);
1660
}
1661
ret = setenv("DELAY", delaystring, 1);
1662
if(ret == -1){
1663
free(delaystring);
1664
perror_plus("setenv");
1665
exit(1);
1666
}
1667
free(delaystring);
1668
ret = execl(fullname, direntry->d_name, "start", NULL);
1669
perror_plus("execl");
1670
} else {
1671
int status;
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1674
free(fullname);
1675
continue;
1676
}
1677
if(WIFEXITED(status)){
1678
if(WEXITSTATUS(status) != 0){
1679
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1680
" with status %d\n", direntry->d_name,
1681
WEXITSTATUS(status));
1682
free(fullname);
1683
continue;
1684
}
1685
} else if(WIFSIGNALED(status)){
1686
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1687
" signal %d\n", direntry->d_name,
1688
WTERMSIG(status));
1689
free(fullname);
1690
continue;
1691
} else {
1692
fprintf_plus(stderr, "Warning: network hook \"%s\" crashed\n",
1693
direntry->d_name);
1694
free(fullname);
1695
continue;
1696
}
1697
}
1698
free(fullname);
1699
if(quit_now){
914
1700
goto end;
915
1701
}
916
1702
}
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
1703
close(devnull);
1704
}
1705
}
1706
1707
if(not debug){
1708
avahi_set_log_function(empty_log);
1709
}
1710
1711
if(interface[0] == '\0'){
1712
struct dirent **direntries;
1713
/* First look for interfaces that are up */
1714
ret = scandir(sys_class_net, &direntries, up_interface,
1715
alphasort);
1716
if(ret == 0){
1717
/* No up interfaces, look for any good interfaces */
1718
free(direntries);
1719
ret = scandir(sys_class_net, &direntries, good_interface,
1720
alphasort);
1721
}
1722
if(ret >= 1){
1723
/* Pick the first interface returned */
1724
interface = strdup(direntries[0]->d_name);
1725
if(debug){
1726
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1727
}
1728
if(interface == NULL){
1729
perror_plus("malloc");
1730
free(direntries);
1731
exitcode = EXIT_FAILURE;
1732
goto end;
1733
}
1734
free(direntries);
1735
} else {
1736
free(direntries);
1737
fprintf_plus(stderr, "Could not find a network interface\n");
1738
exitcode = EXIT_FAILURE;
1739
goto end;
1740
}
1741
}
1742
1743
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1744
from the signal handler */
1745
/* Initialize the pseudo-RNG for Avahi */
1746
srand((unsigned int) time(NULL));
1747
mc.simple_poll = avahi_simple_poll_new();
1748
if(mc.simple_poll == NULL){
1749
fprintf_plus(stderr, "Avahi: Failed to create simple poll object.\n");
1750
exitcode = EX_UNAVAILABLE;
1751
goto end;
1752
}
1753
1754
sigemptyset(&sigterm_action.sa_mask);
1755
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1756
if(ret == -1){
1757
perror_plus("sigaddset");
1758
exitcode = EX_OSERR;
1759
goto end;
1760
}
1761
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1762
if(ret == -1){
1763
perror_plus("sigaddset");
1764
exitcode = EX_OSERR;
1765
goto end;
1766
}
1767
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1768
if(ret == -1){
1769
perror_plus("sigaddset");
1770
exitcode = EX_OSERR;
1771
goto end;
1772
}
1773
/* Need to check if the handler is SIG_IGN before handling:
1774
| [[info:libc:Initial Signal Actions]] |
1775
| [[info:libc:Basic Signal Handling]] |
1776
*/
1777
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1778
if(ret == -1){
1779
perror_plus("sigaction");
1780
return EX_OSERR;
1781
}
1782
if(old_sigterm_action.sa_handler != SIG_IGN){
1783
ret = sigaction(SIGINT, &sigterm_action, NULL);
1784
if(ret == -1){
1785
perror_plus("sigaction");
1786
exitcode = EX_OSERR;
1787
goto end;
1788
}
1789
}
1790
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1791
if(ret == -1){
1792
perror_plus("sigaction");
1793
return EX_OSERR;
1794
}
1795
if(old_sigterm_action.sa_handler != SIG_IGN){
1796
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1797
if(ret == -1){
1798
perror_plus("sigaction");
1799
exitcode = EX_OSERR;
1800
goto end;
1801
}
1802
}
1803
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1804
if(ret == -1){
1805
perror_plus("sigaction");
1806
return EX_OSERR;
1807
}
1808
if(old_sigterm_action.sa_handler != SIG_IGN){
1809
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1810
if(ret == -1){
1811
perror_plus("sigaction");
1812
exitcode = EX_OSERR;
1813
goto end;
1814
}
1815
}
1816
1817
/* If the interface is down, bring it up */
1818
if(strcmp(interface, "none") != 0){
933
1819
if_index = (AvahiIfIndex) if_nametoindex(interface);
934
1820
if(if_index == 0){
935
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
1821
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1822
exitcode = EX_UNAVAILABLE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1830
/* Re-raise priviliges */
1831
errno = 0;
1832
ret = seteuid(0);
1833
if(ret == -1){
1834
perror_plus("seteuid");
1835
}
1836
1837
#ifdef __linux__
1838
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1839
messages about the network interface to mess up the prompt */
1840
ret = klogctl(8, NULL, 5);
1841
bool restore_loglevel = true;
1842
if(ret == -1){
1843
restore_loglevel = false;
1844
perror_plus("klogctl");
1845
}
1846
#endif /* __linux__ */
1847
1848
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1849
if(sd < 0){
1850
perror_plus("socket");
1851
exitcode = EX_OSERR;
1852
#ifdef __linux__
1853
if(restore_loglevel){
1854
ret = klogctl(7, NULL, 0);
1855
if(ret == -1){
1856
perror_plus("klogctl");
1857
}
1858
}
1859
#endif /* __linux__ */
1860
/* Lower privileges */
1861
errno = 0;
1862
ret = seteuid(uid);
1863
if(ret == -1){
1864
perror_plus("seteuid");
1865
}
1866
goto end;
1867
}
1868
strcpy(network.ifr_name, interface);
1869
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1870
if(ret == -1){
1871
perror_plus("ioctl SIOCGIFFLAGS");
1872
#ifdef __linux__
1873
if(restore_loglevel){
1874
ret = klogctl(7, NULL, 0);
1875
if(ret == -1){
1876
perror_plus("klogctl");
1877
}
1878
}
1879
#endif /* __linux__ */
1880
exitcode = EX_OSERR;
1881
/* Lower privileges */
1882
errno = 0;
1883
ret = seteuid(uid);
1884
if(ret == -1){
1885
perror_plus("seteuid");
1886
}
1887
goto end;
1888
}
1889
if((network.ifr_flags & IFF_UP) == 0){
1890
network.ifr_flags |= IFF_UP;
1891
take_down_interface = true;
1892
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1893
if(ret == -1){
1894
take_down_interface = false;
1895
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1896
exitcode = EX_OSERR;
1897
#ifdef __linux__
1898
if(restore_loglevel){
1899
ret = klogctl(7, NULL, 0);
1900
if(ret == -1){
1901
perror_plus("klogctl");
1902
}
1903
}
1904
#endif /* __linux__ */
1905
/* Lower privileges */
1906
errno = 0;
1907
ret = seteuid(uid);
1908
if(ret == -1){
1909
perror_plus("seteuid");
1910
}
1911
goto end;
1912
}
1913
}
1914
/* Sleep checking until interface is running.
1915
Check every 0.25s, up to total time of delay */
1916
for(int i=0; i < delay * 4; i++){
1917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1918
if(ret == -1){
1919
perror_plus("ioctl SIOCGIFFLAGS");
1920
} else if(network.ifr_flags & IFF_RUNNING){
1921
break;
1922
}
1923
struct timespec sleeptime = { .tv_nsec = 250000000 };
1924
ret = nanosleep(&sleeptime, NULL);
1925
if(ret == -1 and errno != EINTR){
1926
perror_plus("nanosleep");
1927
}
1928
}
1929
if(not take_down_interface){
1930
/* We won't need the socket anymore */
1931
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1932
if(ret == -1){
1933
perror_plus("close");
1934
}
1935
}
1936
#ifdef __linux__
1937
if(restore_loglevel){
1938
/* Restores kernel loglevel to default */
1939
ret = klogctl(7, NULL, 0);
1940
if(ret == -1){
1941
perror_plus("klogctl");
1942
}
1943
}
1944
#endif /* __linux__ */
1945
/* Lower privileges */
1946
errno = 0;
1947
if(take_down_interface){
1948
/* Lower privileges */
1949
ret = seteuid(uid);
1950
if(ret == -1){
1951
perror_plus("seteuid");
1952
}
1953
} else {
1954
/* Lower privileges permanently */
1955
ret = setuid(uid);
1956
if(ret == -1){
1957
perror_plus("setuid");
1958
}
1959
}
1960
}
1961
1962
if(quit_now){
1963
goto end;
1964
}
1965
1966
ret = init_gnutls_global(pubkey, seckey);
1967
if(ret == -1){
1968
fprintf_plus(stderr, "init_gnutls_global failed\n");
1969
exitcode = EX_UNAVAILABLE;
1970
goto end;
1971
} else {
1972
gnutls_initialized = true;
1973
}
1974
1975
if(quit_now){
1976
goto end;
1977
}
1978
1979
if(mkdtemp(tempdir) == NULL){
1980
perror_plus("mkdtemp");
1981
goto end;
1982
}
1983
tempdir_created = true;
1984
1985
if(quit_now){
1986
goto end;
1987
}
1988
1989
if(not init_gpgme(pubkey, seckey, tempdir)){
1990
fprintf_plus(stderr, "init_gpgme failed\n");
1991
exitcode = EX_UNAVAILABLE;
1992
goto end;
1993
} else {
1994
gpgme_initialized = true;
1995
}
1996
1997
if(quit_now){
1998
goto end;
1999
}
2000
2001
if(connect_to != NULL){
2002
/* Connect directly, do not use Zeroconf */
2003
/* (Mainly meant for debugging) */
2004
char *address = strrchr(connect_to, ':');
2005
if(address == NULL){
2006
fprintf_plus(stderr, "No colon in address\n");
2007
exitcode = EX_USAGE;
2008
goto end;
2009
}
2010
2011
if(quit_now){
2012
goto end;
2013
}
2014
2015
uint16_t port;
2016
errno = 0;
2017
tmpmax = strtoimax(address+1, &tmp, 10);
2018
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2019
or tmpmax != (uint16_t)tmpmax){
2020
fprintf_plus(stderr, "Bad port number\n");
2021
exitcode = EX_USAGE;
2022
goto end;
2023
}
2024
2025
if(quit_now){
2026
goto end;
2027
}
2028
2029
port = (uint16_t)tmpmax;
2030
*address = '\0';
2031
/* Colon in address indicates IPv6 */
2032
int af;
2033
if(strchr(connect_to, ':') != NULL){
2034
af = AF_INET6;
2035
/* Accept [] around IPv6 address - see RFC 5952 */
2036
if(connect_to[0] == '[' and address[-1] == ']')
2037
{
2038
connect_to++;
2039
address[-1] = '\0';
2040
}
2041
} else {
2042
af = AF_INET;
2043
}
2044
address = connect_to;
2045
2046
if(quit_now){
2047
goto end;
2048
}
2049
2050
while(not quit_now){
2051
ret = start_mandos_communication(address, port, if_index, af);
2052
if(quit_now or ret == 0){
2053
break;
2054
}
2055
if(debug){
2056
fprintf_plus(stderr, "Retrying in %d seconds\n", (int)retry_interval);
2057
}
2058
sleep((int)retry_interval);
2059
}
2060
2061
if (not quit_now){
2062
exitcode = EXIT_SUCCESS;
2063
}
2064
2065
goto end;
2066
}
2067
2068
if(quit_now){
2069
goto end;
2070
}
2071
2072
{
2073
AvahiServerConfig config;
2074
/* Do not publish any local Zeroconf records */
2075
avahi_server_config_init(&config);
2076
config.publish_hinfo = 0;
2077
config.publish_addresses = 0;
2078
config.publish_workstation = 0;
2079
config.publish_domain = 0;
2080
2081
/* Allocate a new server */
2082
mc.server = avahi_server_new(avahi_simple_poll_get
2083
(mc.simple_poll), &config, NULL,
2084
NULL, &error);
2085
2086
/* Free the Avahi configuration data */
2087
avahi_server_config_free(&config);
2088
}
2089
2090
/* Check if creating the Avahi server object succeeded */
2091
if(mc.server == NULL){
2092
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2093
avahi_strerror(error));
2094
exitcode = EX_UNAVAILABLE;
2095
goto end;
2096
}
2097
2098
if(quit_now){
2099
goto end;
2100
}
2101
2102
/* Create the Avahi service browser */
2103
sb = avahi_s_service_browser_new(mc.server, if_index,
2104
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2105
NULL, 0, browse_callback, NULL);
2106
if(sb == NULL){
2107
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2108
avahi_strerror(avahi_server_errno(mc.server)));
2109
exitcode = EX_UNAVAILABLE;
2110
goto end;
2111
}
2112
2113
if(quit_now){
2114
goto end;
2115
}
2116
2117
/* Run the main loop */
2118
2119
if(debug){
2120
fprintf_plus(stderr, "Starting Avahi loop search\n");
2121
}
2122
2123
ret = avahi_loop_with_timeout(mc.simple_poll,
2124
(int)(retry_interval * 1000));
2125
if(debug){
2126
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2127
(ret == 0) ? "successfully" : "with error");
2128
}
2129
1028
2130
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;
2131
2132
if(debug){
2133
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2134
}
2135
2136
/* Cleanup things */
2137
if(sb != NULL)
2138
avahi_s_service_browser_free(sb);
2139
2140
if(mc.server != NULL)
2141
avahi_server_free(mc.server);
2142
2143
if(mc.simple_poll != NULL)
2144
avahi_simple_poll_free(mc.simple_poll);
2145
2146
if(gnutls_initialized){
2147
gnutls_certificate_free_credentials(mc.cred);
2148
gnutls_global_deinit();
2149
gnutls_dh_params_deinit(mc.dh_params);
2150
}
2151
2152
if(gpgme_initialized){
2153
gpgme_release(mc.ctx);
2154
}
2155
2156
/* Cleans up the circular linked list of Mandos servers the client
2157
has seen */
2158
if(mc.current_server != NULL){
2159
mc.current_server->prev->next = NULL;
2160
while(mc.current_server != NULL){
2161
server *next = mc.current_server->next;
2162
free(mc.current_server);
2163
mc.current_server = next;
2164
}
2165
}
2166
2167
/* XXX run network hooks "stop" here */
2168
2169
/* Take down the network interface */
2170
if(take_down_interface){
2171
/* Re-raise priviliges */
2172
errno = 0;
2173
ret = seteuid(0);
2174
if(ret == -1){
2175
perror_plus("seteuid");
2176
}
2177
if(geteuid() == 0){
2178
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2179
if(ret == -1){
2180
perror_plus("ioctl SIOCGIFFLAGS");
2181
} else if(network.ifr_flags & IFF_UP){
2182
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2183
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2184
if(ret == -1){
2185
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2186
}
2187
}
2188
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2189
if(ret == -1){
2190
perror_plus("close");
2191
}
2192
/* Lower privileges permanently */
2193
errno = 0;
2194
ret = setuid(uid);
2195
if(ret == -1){
2196
perror_plus("setuid");
2197
}
2198
}
2199
}
2200
2201
/* Removes the GPGME temp directory and all files inside */
2202
if(tempdir_created){
2203
struct dirent **direntries = NULL;
2204
struct dirent *direntry = NULL;
2205
int numentries = scandir(tempdir, &direntries, notdotentries,
2206
alphasort);
2207
if (numentries > 0){
2208
for(int i = 0; i < numentries; i++){
2209
direntry = direntries[i];
2210
char *fullname = NULL;
2211
ret = asprintf(&fullname, "%s/%s", tempdir,
2212
direntry->d_name);
2213
if(ret < 0){
2214
perror_plus("asprintf");
2215
continue;
2216
}
2217
ret = remove(fullname);
2218
if(ret == -1){
2219
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname, strerror(errno));
2220
}
2221
free(fullname);
2222
}
2223
}
2224
2225
/* need to clean even if 0 because man page doesn't specify */
2226
free(direntries);
2227
if (numentries == -1){
2228
perror_plus("scandir");
2229
}
2230
ret = rmdir(tempdir);
2231
if(ret == -1 and errno != ENOENT){
2232
perror_plus("rmdir");
2233
}
2234
}
2235
2236
if(quit_now){
2237
sigemptyset(&old_sigterm_action.sa_mask);
2238
old_sigterm_action.sa_handler = SIG_DFL;
2239
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2240
&old_sigterm_action,
2241
NULL));
2242
if(ret == -1){
2243
perror_plus("sigaction");
2244
}
2245
do {
2246
ret = raise(signal_received);
2247
} while(ret != 0 and errno == EINTR);
2248
if(ret != 0){
2249
perror_plus("raise");
2250
abort();
2251
}
2252
TEMP_FAILURE_RETRY(pause());
2253
}
2254
2255
return exitcode;
1052
2256
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0