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- Committer: Teddy Hogeborn
- Date: 2008-08-16 03:29:08 UTC
- Revision ID: teddy@fukt.bsnet.se-20080816032908-ihw7c05r2mnyk389
Add feature to specify custom environment variables for plugins.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
* plugin-runner.c (plugin): New members "environ" and "envc" to
contain possible custom environment.
(getplugin): Return NULL on failure instead of doing exit(); all
callers changed.
(add_to_char_array): New helper function for "add_argument" and
"add_environment".
(addargument): Renamed to "add_argument". Return bool. Call
"add_to_char_array" to actually do things.
(add_environment): New; analogous to "add_argument".
(addcustomargument): Renamed to "add_to_argv" to avoid confusion
with "add_argument".
(main): New options "--global-envs" and "--envs-for" to specify
custom environment for plugins. Print environment for
plugins in debug mode. Use asprintf instead of strcpy and
strcat. Use execve() for plugins with custom environments.
Free environment for plugin when freeing plugin list.
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
30
29
*/
31
30
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
38
#endif
39
34
40
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
36
42
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
38
stdout, ferror() */
44
39
#include <stdint.h> /* uint16_t, uint32_t */
45
40
#include <stddef.h> /* NULL, size_t, ssize_t */
46
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
42
srand() */
43
#include <stdbool.h> /* bool, true */
49
44
#include <string.h> /* memset(), strcmp(), strlen(),
50
45
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
46
#include <sys/ioctl.h> /* ioctl */
52
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
48
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
57
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
53
struct in6_addr, inet_pton(),
54
connect() */
64
55
#include <assert.h> /* assert() */
65
56
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
57
#include <time.h> /* time() */
67
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
59
SIOCSIFFLAGS, if_indextoname(),
69
60
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
62
getuid(), getgid(), setuid(),
75
63
setgid() */
64
#include <netinet/in.h>
76
65
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
66
#include <iso646.h> /* not, and */
78
67
#include <argp.h> /* struct argp_option, error_t, struct
79
68
argp_state, struct argp,
80
69
argp_parse(), ARGP_KEY_ARG,
81
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
84
raise() */
85
86
#ifdef __linux__
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
89
71
90
72
/* Avahi */
91
73
/* All Avahi types, constants and functions
104
86
gnutls_*
105
87
init_gnutls_session(),
106
88
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
109
90
GNUTLS_OPENPGP_FMT_BASE64 */
110
91
111
92
/* GPGME */
117
98
118
99
#define BUFFER_SIZE 256
119
100
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
125
103
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
127
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
106
129
107
/* Used for passing in values through the Avahi callback functions */
134
112
unsigned int dh_bits;
135
113
gnutls_dh_params_t dh_params;
136
114
const char *priority;
137
gpgme_ctx_t ctx;
138
115
} mandos_context;
139
116
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
144
145
117
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
148
120
* "buffer_length" is how much is already used.
149
121
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
123
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
126
if (buffer == NULL){
155
127
return 0;
156
128
}
157
129
buffer_capacity += BUFFER_SIZE;
160
132
}
161
133
162
134
/*
163
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
164
137
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
168
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
169
148
gpgme_engine_info_t engine_info;
170
149
171
172
/*
173
* Helper function to insert pub and seckey to the engine keyring.
174
*/
175
bool import_key(const char *filename){
176
int fd;
177
gpgme_data_t pgp_data;
178
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
180
if(fd == -1){
181
perror("open");
182
return false;
183
}
184
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
196
return false;
197
}
198
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
200
if(ret == -1){
201
perror("close");
202
}
203
gpgme_data_release(pgp_data);
204
return true;
205
}
206
207
if(debug){
208
fprintf(stderr, "Initializing GPGME\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
152
}
210
153
211
154
/* Init GPGME */
212
155
gpgme_check_version(NULL);
213
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
215
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
159
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
160
return -1;
218
161
}
219
162
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
223
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
167
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
168
return -1;
226
169
}
227
170
while(engine_info != NULL){
228
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
231
174
break;
232
175
}
233
176
engine_info = engine_info->next;
234
177
}
235
178
if(engine_info == NULL){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
237
return false;
238
}
239
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
245
return false;
246
}
247
248
if(not import_key(pubkey) or not import_key(seckey)){
249
return false;
250
}
251
252
return true;
253
}
254
255
/*
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
258
*/
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
260
size_t crypto_size,
261
char **plaintext){
262
gpgme_data_t dh_crypto, dh_plain;
263
gpgme_error_t rc;
264
ssize_t ret;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
267
268
if(debug){
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
270
181
}
271
182
272
183
/* Create new GPGME data buffer from memory cryptotext */
273
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
185
0);
275
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
276
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
188
gpgme_strsource(rc), gpgme_strerror(rc));
278
189
return -1;
280
191
281
192
/* Create new empty GPGME data buffer for the plaintext */
282
193
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
284
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
196
gpgme_strsource(rc), gpgme_strerror(rc));
286
197
gpgme_data_release(dh_crypto);
287
198
return -1;
288
199
}
289
200
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
290
210
/* Decrypt data from the cryptotext data buffer to the plaintext
291
211
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
294
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
215
gpgme_strsource(rc), gpgme_strerror(rc));
296
216
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
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){
312
240
while(recipient != NULL){
313
241
fprintf(stderr, "Public key algorithm: %s\n",
314
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
320
248
}
321
249
}
322
250
}
323
goto decrypt_end;
324
}
325
326
if(debug){
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
328
251
}
329
252
330
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
333
256
plaintext_length = -1;
334
257
goto decrypt_end;
335
258
}
336
259
337
260
*plaintext = NULL;
338
261
while(true){
339
plaintext_capacity = incbuffer(plaintext,
262
plaintext_capacity = adjustbuffer(plaintext,
340
263
(size_t)plaintext_length,
341
264
plaintext_capacity);
342
if(plaintext_capacity == 0){
343
perror("incbuffer");
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
344
267
plaintext_length = -1;
345
268
goto decrypt_end;
346
269
}
348
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
349
272
BUFFER_SIZE);
350
273
/* Print the data, if any */
351
if(ret == 0){
274
if (ret == 0){
352
275
/* EOF */
353
276
break;
354
277
}
359
282
}
360
283
plaintext_length += ret;
361
284
}
362
285
363
286
if(debug){
364
287
fprintf(stderr, "Decrypted password is: ");
365
288
for(ssize_t i = 0; i < plaintext_length; i++){
378
301
return plaintext_length;
379
302
}
380
303
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
384
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
385
307
ret = "(unknown)";
386
308
return ret;
387
309
}
392
314
fprintf(stderr, "GnuTLS: %s", string);
393
315
}
394
316
395
static int init_gnutls_global(const char *pubkeyfilename,
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
396
319
const char *seckeyfilename){
397
320
int ret;
398
321
401
324
}
402
325
403
326
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
407
330
return -1;
408
331
}
409
332
410
if(debug){
333
if (debug){
411
334
/* "Use a log level over 10 to enable all debugging options."
412
335
* - GnuTLS manual
413
336
*/
416
339
}
417
340
418
341
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
422
from
423
-Wunreachable-code
424
*/
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
427
347
return -1;
428
348
}
429
349
430
350
if(debug){
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
433
353
seckeyfilename);
434
354
}
435
355
436
356
ret = gnutls_certificate_set_openpgp_key_file
437
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
438
358
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
440
360
fprintf(stderr,
441
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
444
364
safer_gnutls_strerror(ret));
445
365
goto globalfail;
446
366
}
447
367
448
368
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
453
goto globalfail;
454
}
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
459
goto globalfail;
460
}
461
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
463
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
373
goto globalfail;
374
}
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
379
goto globalfail;
380
}
381
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
464
384
return 0;
465
385
466
386
globalfail:
467
468
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
469
389
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
471
390
return -1;
391
472
392
}
473
393
474
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
475
396
int ret;
476
397
/* GnuTLS session creation */
477
398
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
479
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
401
safer_gnutls_strerror(ret));
481
402
}
482
403
483
404
{
484
405
const char *err;
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
487
408
fprintf(stderr, "Syntax error at: %s\n", err);
488
409
fprintf(stderr, "GnuTLS error: %s\n",
489
410
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
411
gnutls_deinit (*session);
491
412
return -1;
492
413
}
493
414
}
494
415
495
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
496
mc.cred);
497
if(ret != GNUTLS_E_SUCCESS){
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
498
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
420
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
421
gnutls_deinit (*session);
501
422
return -1;
502
423
}
503
424
504
425
/* ignore client certificate if any. */
505
gnutls_certificate_server_set_request(*session,
506
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
507
428
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
509
430
510
431
return 0;
511
432
}
514
435
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
515
436
__attribute__((unused)) const char *txt){}
516
437
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
519
520
438
/* Called when a Mandos server is found */
521
439
static int start_mandos_communication(const char *ip, uint16_t port,
522
440
AvahiIfIndex if_index,
523
int af){
524
int ret, tcp_sd = -1;
525
ssize_t sret;
526
union {
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
529
} to;
441
mandos_context *mc){
442
int ret, tcp_sd;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
530
444
char *buffer = NULL;
531
445
char *decrypted_buffer;
532
446
size_t buffer_length = 0;
534
448
ssize_t decrypted_buffer_size;
535
449
size_t written;
536
450
int retval = 0;
451
char interface[IF_NAMESIZE];
537
452
gnutls_session_t session;
538
int pf; /* Protocol family */
539
540
if(quit_now){
541
return -1;
542
}
543
544
switch(af){
545
case AF_INET6:
546
pf = PF_INET6;
547
break;
548
case AF_INET:
549
pf = PF_INET;
550
break;
551
default:
552
fprintf(stderr, "Bad address family: %d\n", af);
553
return -1;
554
}
555
556
ret = init_gnutls_session(&session);
557
if(ret != 0){
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
558
456
return -1;
559
457
}
560
458
561
459
if(debug){
562
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
563
461
"\n", ip, port);
564
462
}
565
463
566
tcp_sd = socket(pf, SOCK_STREAM, 0);
567
if(tcp_sd < 0){
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
568
466
perror("socket");
569
retval = -1;
570
goto mandos_end;
571
}
572
573
if(quit_now){
574
goto mandos_end;
575
}
576
577
memset(&to, 0, sizeof(to));
578
if(af == AF_INET6){
579
to.in6.sin6_family = (sa_family_t)af;
580
ret = inet_pton(af, ip, &to.in6.sin6_addr);
581
} else { /* IPv4 */
582
to.in.sin_family = (sa_family_t)af;
583
ret = inet_pton(af, ip, &to.in.sin_addr);
584
}
585
if(ret < 0 ){
467
return -1;
468
}
469
470
if(debug){
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
473
return -1;
474
}
475
fprintf(stderr, "Binding to interface %s\n", interface);
476
}
477
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
586
484
perror("inet_pton");
587
retval = -1;
588
goto mandos_end;
485
return -1;
589
486
}
590
487
if(ret == 0){
591
488
fprintf(stderr, "Bad address: %s\n", ip);
592
retval = -1;
593
goto mandos_end;
594
}
595
if(af == AF_INET6){
596
to.in6.sin6_port = htons(port); /* Spurious warnings from
597
-Wconversion and
598
-Wunreachable-code */
599
600
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
601
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
602
-Wunreachable-code*/
603
if(if_index == AVAHI_IF_UNSPEC){
604
fprintf(stderr, "An IPv6 link-local address is incomplete"
605
" without a network interface\n");
606
retval = -1;
607
goto mandos_end;
608
}
609
/* Set the network interface number as scope */
610
to.in6.sin6_scope_id = (uint32_t)if_index;
611
}
612
} else {
613
to.in.sin_port = htons(port); /* Spurious warnings from
614
-Wconversion and
615
-Wunreachable-code */
616
}
489
return -1;
490
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
617
492
618
if(quit_now){
619
goto mandos_end;
620
}
493
to.in6.sin6_scope_id = (uint32_t)if_index;
621
494
622
495
if(debug){
623
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
624
char interface[IF_NAMESIZE];
625
if(if_indextoname((unsigned int)if_index, interface) == NULL){
626
perror("if_indextoname");
627
} else {
628
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
629
ip, interface, port);
630
}
631
} else {
632
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
633
port);
634
}
635
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
636
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
637
const char *pcret;
638
if(af == AF_INET6){
639
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
640
sizeof(addrstr));
641
} else {
642
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
643
sizeof(addrstr));
644
}
645
if(pcret == NULL){
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
port);
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
646
501
perror("inet_ntop");
647
502
} else {
648
503
if(strcmp(addrstr, ip) != 0){
651
506
}
652
507
}
653
508
654
if(quit_now){
655
goto mandos_end;
656
}
657
658
if(af == AF_INET6){
659
ret = connect(tcp_sd, &to.in6, sizeof(to));
660
} else {
661
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
662
}
663
if(ret < 0){
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
664
511
perror("connect");
665
retval = -1;
666
goto mandos_end;
667
}
668
669
if(quit_now){
670
goto mandos_end;
671
}
672
512
return -1;
513
}
514
673
515
const char *out = mandos_protocol_version;
674
516
written = 0;
675
while(true){
517
while (true){
676
518
size_t out_size = strlen(out);
677
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
678
520
out_size - written));
679
if(ret == -1){
521
if (ret == -1){
680
522
perror("write");
681
523
retval = -1;
682
524
goto mandos_end;
685
527
if(written < out_size){
686
528
continue;
687
529
} else {
688
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
689
531
written = 0;
690
532
out = "\r\n";
691
533
} else {
692
534
break;
693
535
}
694
536
}
695
696
if(quit_now){
697
goto mandos_end;
698
}
699
537
}
700
538
701
539
if(debug){
702
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
703
541
}
704
542
705
if(quit_now){
706
goto mandos_end;
707
}
708
709
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
710
711
if(quit_now){
712
goto mandos_end;
713
}
714
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
715
545
do{
716
ret = gnutls_handshake(session);
717
if(quit_now){
718
goto mandos_end;
719
}
546
ret = gnutls_handshake (session);
720
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
721
548
722
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
723
550
if(debug){
724
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
725
gnutls_perror(ret);
552
gnutls_perror (ret);
726
553
}
727
554
retval = -1;
728
555
goto mandos_end;
731
558
/* Read OpenPGP packet that contains the wanted password */
732
559
733
560
if(debug){
734
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
735
562
ip);
736
563
}
737
564
738
565
while(true){
739
740
if(quit_now){
741
goto mandos_end;
742
}
743
744
buffer_capacity = incbuffer(&buffer, buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
745
567
buffer_capacity);
746
if(buffer_capacity == 0){
747
perror("incbuffer");
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
748
570
retval = -1;
749
571
goto mandos_end;
750
572
}
751
573
752
if(quit_now){
753
goto mandos_end;
754
}
755
756
sret = gnutls_record_recv(session, buffer+buffer_length,
757
BUFFER_SIZE);
758
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
759
577
break;
760
578
}
761
if(sret < 0){
762
switch(sret){
579
if (ret < 0){
580
switch(ret){
763
581
case GNUTLS_E_INTERRUPTED:
764
582
case GNUTLS_E_AGAIN:
765
583
break;
766
584
case GNUTLS_E_REHANDSHAKE:
767
585
do{
768
ret = gnutls_handshake(session);
769
770
if(quit_now){
771
goto mandos_end;
772
}
586
ret = gnutls_handshake (session);
773
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
774
if(ret < 0){
588
if (ret < 0){
775
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
776
gnutls_perror(ret);
590
gnutls_perror (ret);
777
591
retval = -1;
778
592
goto mandos_end;
779
593
}
782
596
fprintf(stderr, "Unknown error while reading data from"
783
597
" encrypted session with Mandos server\n");
784
598
retval = -1;
785
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
786
600
goto mandos_end;
787
601
}
788
602
} else {
789
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
790
604
}
791
605
}
792
606
794
608
fprintf(stderr, "Closing TLS session\n");
795
609
}
796
610
797
if(quit_now){
798
goto mandos_end;
799
}
800
801
gnutls_bye(session, GNUTLS_SHUT_RDWR);
802
803
if(quit_now){
804
goto mandos_end;
805
}
806
807
if(buffer_length > 0){
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
613
if (buffer_length > 0){
808
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
809
615
buffer_length,
810
&decrypted_buffer);
811
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
812
619
written = 0;
813
620
while(written < (size_t) decrypted_buffer_size){
814
if(quit_now){
815
goto mandos_end;
816
}
817
818
ret = (int)fwrite(decrypted_buffer + written, 1,
819
(size_t)decrypted_buffer_size - written,
820
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
821
624
if(ret == 0 and ferror(stdout)){
822
625
if(debug){
823
626
fprintf(stderr, "Error writing encrypted data: %s\n",
832
635
} else {
833
636
retval = -1;
834
637
}
835
} else {
836
retval = -1;
837
638
}
838
639
839
640
/* Shutdown procedure */
840
641
841
642
mandos_end:
842
643
free(buffer);
843
if(tcp_sd >= 0){
844
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
845
}
846
if(ret == -1){
847
perror("close");
848
}
849
gnutls_deinit(session);
850
if(quit_now){
851
retval = -1;
852
}
644
close(tcp_sd);
645
gnutls_deinit (session);
853
646
return retval;
854
647
}
855
648
856
649
static void resolve_callback(AvahiSServiceResolver *r,
857
650
AvahiIfIndex interface,
858
AvahiProtocol proto,
651
AVAHI_GCC_UNUSED AvahiProtocol protocol,
859
652
AvahiResolverEvent event,
860
653
const char *name,
861
654
const char *type,
866
659
AVAHI_GCC_UNUSED AvahiStringList *txt,
867
660
AVAHI_GCC_UNUSED AvahiLookupResultFlags
868
661
flags,
869
AVAHI_GCC_UNUSED void* userdata){
870
assert(r);
662
void* userdata) {
663
mandos_context *mc = userdata;
664
assert(r); /* Spurious warning */
871
665
872
666
/* Called whenever a service has been resolved successfully or
873
667
timed out */
874
668
875
if(quit_now){
876
return;
877
}
878
879
switch(event){
669
switch (event) {
880
670
default:
881
671
case AVAHI_RESOLVER_FAILURE:
882
672
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
883
673
" of type '%s' in domain '%s': %s\n", name, type, domain,
884
avahi_strerror(avahi_server_errno(mc.server)));
674
avahi_strerror(avahi_server_errno(mc->server)));
885
675
break;
886
676
887
677
case AVAHI_RESOLVER_FOUND:
890
680
avahi_address_snprint(ip, sizeof(ip), address);
891
681
if(debug){
892
682
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
893
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
894
ip, (intmax_t)interface, port);
683
PRIu16 ") on port %d\n", name, host_name, ip,
684
interface, port);
895
685
}
896
int ret = start_mandos_communication(ip, port, interface,
897
avahi_proto_to_af(proto));
898
if(ret == 0){
899
avahi_simple_poll_quit(mc.simple_poll);
686
int ret = start_mandos_communication(ip, port, interface, mc);
687
if (ret == 0){
688
avahi_simple_poll_quit(mc->simple_poll);
900
689
}
901
690
}
902
691
}
903
692
avahi_s_service_resolver_free(r);
904
693
}
905
694
906
static void browse_callback(AvahiSServiceBrowser *b,
907
AvahiIfIndex interface,
908
AvahiProtocol protocol,
909
AvahiBrowserEvent event,
910
const char *name,
911
const char *type,
912
const char *domain,
913
AVAHI_GCC_UNUSED AvahiLookupResultFlags
914
flags,
915
AVAHI_GCC_UNUSED void* userdata){
916
assert(b);
695
static void browse_callback( AvahiSServiceBrowser *b,
696
AvahiIfIndex interface,
697
AvahiProtocol protocol,
698
AvahiBrowserEvent event,
699
const char *name,
700
const char *type,
701
const char *domain,
702
AVAHI_GCC_UNUSED AvahiLookupResultFlags
703
flags,
704
void* userdata) {
705
mandos_context *mc = userdata;
706
assert(b); /* Spurious warning */
917
707
918
708
/* Called whenever a new services becomes available on the LAN or
919
709
is removed from the LAN */
920
710
921
if(quit_now){
922
return;
923
}
924
925
switch(event){
711
switch (event) {
926
712
default:
927
713
case AVAHI_BROWSER_FAILURE:
928
714
929
715
fprintf(stderr, "(Avahi browser) %s\n",
930
avahi_strerror(avahi_server_errno(mc.server)));
931
avahi_simple_poll_quit(mc.simple_poll);
716
avahi_strerror(avahi_server_errno(mc->server)));
717
avahi_simple_poll_quit(mc->simple_poll);
932
718
return;
933
719
934
720
case AVAHI_BROWSER_NEW:
937
723
the callback function is called the Avahi server will free the
938
724
resolver for us. */
939
725
940
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
941
name, type, domain, protocol, 0,
942
resolve_callback, NULL) == NULL)
726
if (!(avahi_s_service_resolver_new(mc->server, interface,
727
protocol, name, type, domain,
728
AVAHI_PROTO_INET6, 0,
729
resolve_callback, mc)))
943
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
944
name, avahi_strerror(avahi_server_errno(mc.server)));
731
name, avahi_strerror(avahi_server_errno(mc->server)));
945
732
break;
946
733
947
734
case AVAHI_BROWSER_REMOVE:
956
743
}
957
744
}
958
745
959
/* stop main loop after sigterm has been called */
960
static void handle_sigterm(int sig){
961
if(quit_now){
962
return;
963
}
964
quit_now = 1;
965
signal_received = sig;
966
int old_errno = errno;
967
if(mc.simple_poll != NULL){
968
avahi_simple_poll_quit(mc.simple_poll);
969
}
970
errno = old_errno;
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
749
char *tmp;
750
int ret = asprintf(&tmp, "%s/%s", first, second);
751
if(ret < 0){
752
return NULL;
753
}
754
return tmp;
971
755
}
972
756
757
973
758
int main(int argc, char *argv[]){
974
AvahiSServiceBrowser *sb = NULL;
975
int error;
976
int ret;
977
intmax_t tmpmax;
978
char *tmp;
979
int exitcode = EXIT_SUCCESS;
980
const char *interface = "eth0";
981
struct ifreq network;
982
int sd = -1;
983
bool take_down_interface = false;
984
uid_t uid;
985
gid_t gid;
986
char *connect_to = NULL;
987
char tempdir[] = "/tmp/mandosXXXXXX";
988
bool tempdir_created = false;
989
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
990
const char *seckey = PATHDIR "/" SECKEY;
991
const char *pubkey = PATHDIR "/" PUBKEY;
992
993
bool gnutls_initialized = false;
994
bool gpgme_initialized = false;
995
float delay = 2.5f;
996
997
struct sigaction old_sigterm_action;
998
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
999
1000
{
1001
struct argp_option options[] = {
1002
{ .name = "debug", .key = 128,
1003
.doc = "Debug mode", .group = 3 },
1004
{ .name = "connect", .key = 'c',
1005
.arg = "ADDRESS:PORT",
1006
.doc = "Connect directly to a specific Mandos server",
1007
.group = 1 },
1008
{ .name = "interface", .key = 'i',
1009
.arg = "NAME",
1010
.doc = "Network interface that will be used to search for"
1011
" Mandos servers",
1012
.group = 1 },
1013
{ .name = "seckey", .key = 's',
1014
.arg = "FILE",
1015
.doc = "OpenPGP secret key file base name",
1016
.group = 1 },
1017
{ .name = "pubkey", .key = 'p',
1018
.arg = "FILE",
1019
.doc = "OpenPGP public key file base name",
1020
.group = 2 },
1021
{ .name = "dh-bits", .key = 129,
1022
.arg = "BITS",
1023
.doc = "Bit length of the prime number used in the"
1024
" Diffie-Hellman key exchange",
1025
.group = 2 },
1026
{ .name = "priority", .key = 130,
1027
.arg = "STRING",
1028
.doc = "GnuTLS priority string for the TLS handshake",
1029
.group = 1 },
1030
{ .name = "delay", .key = 131,
1031
.arg = "SECONDS",
1032
.doc = "Maximum delay to wait for interface startup",
1033
.group = 2 },
1034
{ .name = NULL }
1035
};
1036
1037
error_t parse_opt(int key, char *arg,
1038
struct argp_state *state){
1039
switch(key){
1040
case 128: /* --debug */
1041
debug = true;
1042
break;
1043
case 'c': /* --connect */
1044
connect_to = arg;
1045
break;
1046
case 'i': /* --interface */
1047
interface = arg;
1048
break;
1049
case 's': /* --seckey */
1050
seckey = arg;
1051
break;
1052
case 'p': /* --pubkey */
1053
pubkey = arg;
1054
break;
1055
case 129: /* --dh-bits */
1056
errno = 0;
1057
tmpmax = strtoimax(arg, &tmp, 10);
1058
if(errno != 0 or tmp == arg or *tmp != '\0'
1059
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1060
fprintf(stderr, "Bad number of DH bits\n");
1061
exit(EXIT_FAILURE);
1062
}
1063
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1064
break;
1065
case 130: /* --priority */
1066
mc.priority = arg;
1067
break;
1068
case 131: /* --delay */
1069
errno = 0;
1070
delay = strtof(arg, &tmp);
1071
if(errno != 0 or tmp == arg or *tmp != '\0'){
1072
fprintf(stderr, "Bad delay\n");
1073
exit(EXIT_FAILURE);
1074
}
1075
break;
1076
case ARGP_KEY_ARG:
1077
argp_usage(state);
1078
case ARGP_KEY_END:
1079
break;
1080
default:
1081
return ARGP_ERR_UNKNOWN;
1082
}
1083
return 0;
1084
}
1085
1086
struct argp argp = { .options = options, .parser = parse_opt,
1087
.args_doc = "",
1088
.doc = "Mandos client -- Get and decrypt"
1089
" passwords from a Mandos server" };
1090
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1091
if(ret == ARGP_ERR_UNKNOWN){
1092
fprintf(stderr, "Unknown error while parsing arguments\n");
1093
exitcode = EXIT_FAILURE;
1094
goto end;
1095
}
1096
}
1097
1098
if(not debug){
1099
avahi_set_log_function(empty_log);
1100
}
1101
1102
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1103
from the signal handler */
1104
/* Initialize the pseudo-RNG for Avahi */
1105
srand((unsigned int) time(NULL));
1106
mc.simple_poll = avahi_simple_poll_new();
1107
if(mc.simple_poll == NULL){
1108
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1109
exitcode = EXIT_FAILURE;
1110
goto end;
1111
}
1112
1113
sigemptyset(&sigterm_action.sa_mask);
1114
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1115
if(ret == -1){
1116
perror("sigaddset");
1117
exitcode = EXIT_FAILURE;
1118
goto end;
1119
}
1120
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1121
if(ret == -1){
1122
perror("sigaddset");
1123
exitcode = EXIT_FAILURE;
1124
goto end;
1125
}
1126
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1127
if(ret == -1){
1128
perror("sigaddset");
1129
exitcode = EXIT_FAILURE;
1130
goto end;
1131
}
1132
/* Need to check if the handler is SIG_IGN before handling:
1133
| [[info:libc:Initial Signal Actions]] |
1134
| [[info:libc:Basic Signal Handling]] |
1135
*/
1136
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1137
if(ret == -1){
1138
perror("sigaction");
1139
return EXIT_FAILURE;
1140
}
1141
if(old_sigterm_action.sa_handler != SIG_IGN){
1142
ret = sigaction(SIGINT, &sigterm_action, NULL);
1143
if(ret == -1){
1144
perror("sigaction");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1148
}
1149
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1150
if(ret == -1){
1151
perror("sigaction");
1152
return EXIT_FAILURE;
1153
}
1154
if(old_sigterm_action.sa_handler != SIG_IGN){
1155
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1156
if(ret == -1){
1157
perror("sigaction");
1158
exitcode = EXIT_FAILURE;
1159
goto end;
1160
}
1161
}
1162
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1163
if(ret == -1){
1164
perror("sigaction");
1165
return EXIT_FAILURE;
1166
}
1167
if(old_sigterm_action.sa_handler != SIG_IGN){
1168
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1169
if(ret == -1){
1170
perror("sigaction");
1171
exitcode = EXIT_FAILURE;
1172
goto end;
1173
}
1174
}
1175
1176
/* If the interface is down, bring it up */
1177
if(interface[0] != '\0'){
759
AvahiSServiceBrowser *sb = NULL;
760
int error;
761
int ret;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
765
int sd;
766
uid_t uid;
767
gid_t gid;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
777
778
{
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
783
.arg = "IP",
784
.doc = "Connect directly to a sepcified mandos server",
785
.group = 1 },
786
{ .name = "interface", .key = 'i',
787
.arg = "INTERFACE",
788
.doc = "Interface that Avahi will conntect through",
789
.group = 1 },
790
{ .name = "keydir", .key = 'd',
791
.arg = "KEYDIR",
792
.doc = "Directory where the openpgp keyring is",
793
.group = 1 },
794
{ .name = "seckey", .key = 's',
795
.arg = "SECKEY",
796
.doc = "Secret openpgp key for gnutls authentication",
797
.group = 1 },
798
{ .name = "pubkey", .key = 'p',
799
.arg = "PUBKEY",
800
.doc = "Public openpgp key for gnutls authentication",
801
.group = 2 },
802
{ .name = "dh-bits", .key = 129,
803
.arg = "BITS",
804
.doc = "dh-bits to use in gnutls communication",
805
.group = 2 },
806
{ .name = "priority", .key = 130,
807
.arg = "PRIORITY",
808
.doc = "GNUTLS priority", .group = 1 },
809
{ .name = NULL }
810
};
811
812
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
817
switch (key) {
818
case 128:
819
debug = true;
820
break;
821
case 'c':
822
connect_to = arg;
823
break;
824
case 'i':
825
interface = arg;
826
break;
827
case 'd':
828
keydir = arg;
829
break;
830
case 's':
831
seckeyname = arg;
832
break;
833
case 'p':
834
pubkeyname = arg;
835
break;
836
case 129:
837
errno = 0;
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
839
if (errno){
840
perror("strtol");
841
exit(EXIT_FAILURE);
842
}
843
break;
844
case 130:
845
mc.priority = arg;
846
break;
847
case ARGP_KEY_ARG:
848
argp_usage (state);
849
case ARGP_KEY_END:
850
break;
851
default:
852
return ARGP_ERR_UNKNOWN;
853
}
854
return 0;
855
}
856
857
struct argp argp = { .options = options, .parser = parse_opt,
858
.args_doc = "",
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
865
goto end;
866
}
867
}
868
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
873
goto end;
874
}
875
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
884
if (ret == -1){
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
887
goto end;
888
} else {
889
gnutls_initalized = true;
890
}
891
892
/* If the interface is down, bring it up */
893
{
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
895
if(sd < 0) {
896
perror("socket");
897
exitcode = EXIT_FAILURE;
898
goto end;
899
}
900
strcpy(network.ifr_name, interface); /* Spurious warning */
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
902
if(ret == -1){
903
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
905
goto end;
906
}
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
910
if(ret == -1){
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
913
goto end;
914
}
915
}
916
close(sd);
917
}
918
919
uid = getuid();
920
gid = getgid();
921
922
ret = setuid(uid);
923
if (ret == -1){
924
perror("setuid");
925
}
926
927
setgid(gid);
928
if (ret == -1){
929
perror("setgid");
930
}
931
1178
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
1179
933
if(if_index == 0){
1180
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1181
exitcode = EXIT_FAILURE;
1182
goto end;
1183
}
1184
1185
if(quit_now){
1186
goto end;
1187
}
1188
1189
#ifdef __linux__
1190
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1191
messages to mess up the prompt */
1192
ret = klogctl(8, NULL, 5);
1193
bool restore_loglevel = true;
1194
if(ret == -1){
1195
restore_loglevel = false;
1196
perror("klogctl");
1197
}
1198
#endif /* __linux__ */
1199
1200
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1201
if(sd < 0){
1202
perror("socket");
1203
exitcode = EXIT_FAILURE;
1204
#ifdef __linux__
1205
if(restore_loglevel){
1206
ret = klogctl(7, NULL, 0);
1207
if(ret == -1){
1208
perror("klogctl");
1209
}
1210
}
1211
#endif /* __linux__ */
1212
goto end;
1213
}
1214
strcpy(network.ifr_name, interface);
1215
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1216
if(ret == -1){
1217
perror("ioctl SIOCGIFFLAGS");
1218
#ifdef __linux__
1219
if(restore_loglevel){
1220
ret = klogctl(7, NULL, 0);
1221
if(ret == -1){
1222
perror("klogctl");
1223
}
1224
}
1225
#endif /* __linux__ */
1226
exitcode = EXIT_FAILURE;
1227
goto end;
1228
}
1229
if((network.ifr_flags & IFF_UP) == 0){
1230
network.ifr_flags |= IFF_UP;
1231
take_down_interface = true;
1232
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1233
if(ret == -1){
1234
take_down_interface = false;
1235
perror("ioctl SIOCSIFFLAGS");
1236
exitcode = EXIT_FAILURE;
1237
#ifdef __linux__
1238
if(restore_loglevel){
1239
ret = klogctl(7, NULL, 0);
1240
if(ret == -1){
1241
perror("klogctl");
1242
}
1243
}
1244
#endif /* __linux__ */
1245
goto end;
1246
}
1247
}
1248
/* sleep checking until interface is running */
1249
for(int i=0; i < delay * 4; i++){
1250
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1251
if(ret == -1){
1252
perror("ioctl SIOCGIFFLAGS");
1253
} else if(network.ifr_flags & IFF_RUNNING){
1254
break;
1255
}
1256
struct timespec sleeptime = { .tv_nsec = 250000000 };
1257
ret = nanosleep(&sleeptime, NULL);
1258
if(ret == -1 and errno != EINTR){
1259
perror("nanosleep");
1260
}
1261
}
1262
if(not take_down_interface){
1263
/* We won't need the socket anymore */
1264
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1265
if(ret == -1){
1266
perror("close");
1267
}
1268
}
1269
#ifdef __linux__
1270
if(restore_loglevel){
1271
/* Restores kernel loglevel to default */
1272
ret = klogctl(7, NULL, 0);
1273
if(ret == -1){
1274
perror("klogctl");
1275
}
1276
}
1277
#endif /* __linux__ */
1278
}
1279
1280
if(quit_now){
1281
goto end;
1282
}
1283
1284
uid = getuid();
1285
gid = getgid();
1286
1287
errno = 0;
1288
setgid(gid);
1289
if(ret == -1){
1290
perror("setgid");
1291
}
1292
1293
ret = setuid(uid);
1294
if(ret == -1){
1295
perror("setuid");
1296
}
1297
1298
if(quit_now){
1299
goto end;
1300
}
1301
1302
ret = init_gnutls_global(pubkey, seckey);
1303
if(ret == -1){
1304
fprintf(stderr, "init_gnutls_global failed\n");
1305
exitcode = EXIT_FAILURE;
1306
goto end;
1307
} else {
1308
gnutls_initialized = true;
1309
}
1310
1311
if(quit_now){
1312
goto end;
1313
}
1314
1315
tempdir_created = true;
1316
if(mkdtemp(tempdir) == NULL){
1317
tempdir_created = false;
1318
perror("mkdtemp");
1319
goto end;
1320
}
1321
1322
if(quit_now){
1323
goto end;
1324
}
1325
1326
if(not init_gpgme(pubkey, seckey, tempdir)){
1327
fprintf(stderr, "init_gpgme failed\n");
1328
exitcode = EXIT_FAILURE;
1329
goto end;
1330
} else {
1331
gpgme_initialized = true;
1332
}
1333
1334
if(quit_now){
1335
goto end;
1336
}
1337
1338
if(connect_to != NULL){
1339
/* Connect directly, do not use Zeroconf */
1340
/* (Mainly meant for debugging) */
1341
char *address = strrchr(connect_to, ':');
1342
if(address == NULL){
1343
fprintf(stderr, "No colon in address\n");
1344
exitcode = EXIT_FAILURE;
1345
goto end;
1346
}
1347
1348
if(quit_now){
1349
goto end;
1350
}
1351
1352
uint16_t port;
1353
errno = 0;
1354
tmpmax = strtoimax(address+1, &tmp, 10);
1355
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1356
or tmpmax != (uint16_t)tmpmax){
1357
fprintf(stderr, "Bad port number\n");
1358
exitcode = EXIT_FAILURE;
1359
goto end;
1360
}
1361
1362
if(quit_now){
1363
goto end;
1364
}
1365
1366
port = (uint16_t)tmpmax;
1367
*address = '\0';
1368
address = connect_to;
1369
/* Colon in address indicates IPv6 */
1370
int af;
1371
if(strchr(address, ':') != NULL){
1372
af = AF_INET6;
1373
} else {
1374
af = AF_INET;
1375
}
1376
1377
if(quit_now){
1378
goto end;
1379
}
1380
1381
ret = start_mandos_communication(address, port, if_index, af);
1382
if(ret < 0){
1383
exitcode = EXIT_FAILURE;
1384
} else {
1385
exitcode = EXIT_SUCCESS;
1386
}
1387
goto end;
1388
}
1389
1390
if(quit_now){
1391
goto end;
1392
}
1393
1394
{
1395
AvahiServerConfig config;
1396
/* Do not publish any local Zeroconf records */
1397
avahi_server_config_init(&config);
1398
config.publish_hinfo = 0;
1399
config.publish_addresses = 0;
1400
config.publish_workstation = 0;
1401
config.publish_domain = 0;
1402
1403
/* Allocate a new server */
1404
mc.server = avahi_server_new(avahi_simple_poll_get
1405
(mc.simple_poll), &config, NULL,
1406
NULL, &error);
1407
1408
/* Free the Avahi configuration data */
1409
avahi_server_config_free(&config);
1410
}
1411
1412
/* Check if creating the Avahi server object succeeded */
1413
if(mc.server == NULL){
1414
fprintf(stderr, "Failed to create Avahi server: %s\n",
1415
avahi_strerror(error));
1416
exitcode = EXIT_FAILURE;
1417
goto end;
1418
}
1419
1420
if(quit_now){
1421
goto end;
1422
}
1423
1424
/* Create the Avahi service browser */
1425
sb = avahi_s_service_browser_new(mc.server, if_index,
1426
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1427
NULL, 0, browse_callback, NULL);
1428
if(sb == NULL){
1429
fprintf(stderr, "Failed to create service browser: %s\n",
1430
avahi_strerror(avahi_server_errno(mc.server)));
1431
exitcode = EXIT_FAILURE;
1432
goto end;
1433
}
1434
1435
if(quit_now){
1436
goto end;
1437
}
1438
1439
/* Run the main loop */
1440
1441
if(debug){
1442
fprintf(stderr, "Starting Avahi loop search\n");
1443
}
1444
1445
avahi_simple_poll_loop(mc.simple_poll);
1446
935
exit(EXIT_FAILURE);
936
}
937
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
942
if(address == NULL){
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
945
goto end;
946
}
947
errno = 0;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
if(errno){
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
952
goto end;
953
}
954
*address = '\0';
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
957
if(ret < 0){
958
exitcode = EXIT_FAILURE;
959
} else {
960
exitcode = EXIT_SUCCESS;
961
}
962
goto end;
963
}
964
965
if (not debug){
966
avahi_set_log_function(empty_log);
967
}
968
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
971
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
976
" object.\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
}
980
981
{
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
989
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
993
NULL, &error);
994
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
997
}
998
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
AVAHI_PROTO_INET6,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1012
if (sb == NULL) {
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1016
goto end;
1017
}
1018
1019
/* Run the main loop */
1020
1021
if (debug){
1022
fprintf(stderr, "Starting Avahi loop search\n");
1023
}
1024
1025
avahi_simple_poll_loop(mc.simple_poll);
1026
1447
1027
end:
1448
1449
if(debug){
1450
fprintf(stderr, "%s exiting\n", argv[0]);
1451
}
1452
1453
/* Cleanup things */
1454
if(sb != NULL)
1455
avahi_s_service_browser_free(sb);
1456
1457
if(mc.server != NULL)
1458
avahi_server_free(mc.server);
1459
1460
if(mc.simple_poll != NULL)
1461
avahi_simple_poll_free(mc.simple_poll);
1462
1463
if(gnutls_initialized){
1464
gnutls_certificate_free_credentials(mc.cred);
1465
gnutls_global_deinit();
1466
gnutls_dh_params_deinit(mc.dh_params);
1467
}
1468
1469
if(gpgme_initialized){
1470
gpgme_release(mc.ctx);
1471
}
1472
1473
/* Take down the network interface */
1474
if(take_down_interface){
1475
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1476
if(ret == -1){
1477
perror("ioctl SIOCGIFFLAGS");
1478
} else if(network.ifr_flags & IFF_UP) {
1479
network.ifr_flags &= ~IFF_UP; /* clear flag */
1480
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1481
if(ret == -1){
1482
perror("ioctl SIOCSIFFLAGS");
1483
}
1484
}
1485
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1486
if(ret == -1){
1487
perror("close");
1488
}
1489
}
1490
1491
/* Removes the temp directory used by GPGME */
1492
if(tempdir_created){
1493
DIR *d;
1494
struct dirent *direntry;
1495
d = opendir(tempdir);
1496
if(d == NULL){
1497
if(errno != ENOENT){
1498
perror("opendir");
1499
}
1500
} else {
1501
while(true){
1502
direntry = readdir(d);
1503
if(direntry == NULL){
1504
break;
1505
}
1506
/* Skip "." and ".." */
1507
if(direntry->d_name[0] == '.'
1508
and (direntry->d_name[1] == '\0'
1509
or (direntry->d_name[1] == '.'
1510
and direntry->d_name[2] == '\0'))){
1511
continue;
1512
}
1513
char *fullname = NULL;
1514
ret = asprintf(&fullname, "%s/%s", tempdir,
1515
direntry->d_name);
1516
if(ret < 0){
1517
perror("asprintf");
1518
continue;
1519
}
1520
ret = remove(fullname);
1521
if(ret == -1){
1522
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1523
strerror(errno));
1524
}
1525
free(fullname);
1526
}
1527
closedir(d);
1528
}
1529
ret = rmdir(tempdir);
1530
if(ret == -1 and errno != ENOENT){
1531
perror("rmdir");
1532
}
1533
}
1534
1535
if(quit_now){
1536
sigemptyset(&old_sigterm_action.sa_mask);
1537
old_sigterm_action.sa_handler = SIG_DFL;
1538
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1539
if(ret == -1){
1540
perror("sigaction");
1541
}
1542
raise(signal_received);
1543
}
1544
1545
return exitcode;
1028
1029
if (debug){
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1031
}
1032
1033
/* Cleanup things */
1034
if (sb != NULL)
1035
avahi_s_service_browser_free(sb);
1036
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1039
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1044
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1048
}
1049
1050
return exitcode;
1546
1051
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0