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- Committer: Teddy Hogeborn
- Date: 2009-02-09 05:48:04 UTC
- mfrom: (24.1.134 mandos)
- Revision ID: teddy@fukt.bsnet.se-20090209054804-6phrjjrzjlpvuz7u
Merge from Björn:
* plugin-runner.c (main): Bug fix: For the "--options-for" option, do
not mangle arguments with colon characters.
Also support adding empty arguments.
* plugins.d/mandos-client.c: (mc): New global variable; moved from
"main".
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication): Removed "mc"
argument. All
callers changed.
(resolve_callback, browse_callback): Ignore "userdata" argument.
All callers changed.
(handle_sigterm): New function.
(main): Add "handle_sigterm" as signal handler for SIGTERM before
starting the main loop.
* plugin-runner.c (main): Bug fix: For the "--options-for" option, do
not mangle arguments with colon characters.
Also support adding empty arguments.
* plugins.d/mandos-client.c: (mc): New global variable; moved from
"main".
(init_gpgme, pgp_packet_decrypt, init_gnutls_global,
init_gnutls_session, start_mandos_communication): Removed "mc"
argument. All
callers changed.
(resolve_callback, browse_callback): Ignore "userdata" argument.
All callers changed.
(handle_sigterm): New function.
(main): Add "handle_sigterm" as signal handler for SIGTERM before
starting the main loop.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
39
stdout, ferror(), sscanf(),
40
remove() */
39
41
#include <stdint.h> /* uint16_t, uint32_t */
40
42
#include <stddef.h> /* NULL, size_t, ssize_t */
41
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
44
srand() */
43
#include <stdbool.h> /* bool, true */
45
#include <stdbool.h> /* bool, false, true */
44
46
#include <string.h> /* memset(), strcmp(), strlen(),
45
47
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
47
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
50
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
52
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
54
connect() */
55
inet_pton(), connect() */
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir()
58
*/
59
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
55
60
#include <assert.h> /* assert() */
56
61
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
62
#include <time.h> /* nanosleep(), time() */
58
63
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
64
SIOCSIFFLAGS, if_indextoname(),
60
65
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
61
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
70
getuid(), getgid(), setuid(),
63
71
setgid() */
64
#include <netinet/in.h>
65
72
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, or, and */
67
74
#include <argp.h> /* struct argp_option, error_t, struct
68
75
argp_state, struct argp,
69
76
argp_parse(), ARGP_KEY_ARG,
70
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(),
79
sigaction(), SIGTERM, sigaction */
80
81
#ifdef __linux__
82
#include <sys/klog.h> /* klogctl() */
83
#endif
71
84
72
85
/* Avahi */
73
86
/* All Avahi types, constants and functions
86
99
gnutls_*
87
100
init_gnutls_session(),
88
101
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
102
#include <gnutls/openpgp.h>
103
/* gnutls_certificate_set_openpgp_key_file(),
90
104
GNUTLS_OPENPGP_FMT_BASE64 */
91
105
92
106
/* GPGME */
98
112
99
113
#define BUFFER_SIZE 256
100
114
115
#define PATHDIR "/conf/conf.d/mandos"
116
#define SECKEY "seckey.txt"
117
#define PUBKEY "pubkey.txt"
118
101
119
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
120
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
121
const char *argp_program_version = "mandos-client " VERSION;
105
122
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
123
107
124
/* Used for passing in values through the Avahi callback functions */
112
129
unsigned int dh_bits;
113
130
gnutls_dh_params_t dh_params;
114
131
const char *priority;
132
gpgme_ctx_t ctx;
115
133
} mandos_context;
116
134
135
/* global context so signal handler can reach it*/
136
mandos_context mc;
137
117
138
/*
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
139
* Make additional room in "buffer" for at least BUFFER_SIZE
140
* additional bytes. "buffer_capacity" is how much is currently
141
* allocated, "buffer_length" is how much is already used.
121
142
*/
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
143
size_t incbuffer(char **buffer, size_t buffer_length,
123
144
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
145
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
146
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
147
if(buffer == NULL){
127
148
return 0;
128
149
}
129
150
buffer_capacity += BUFFER_SIZE;
132
153
}
133
154
134
155
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
156
* Initialize GPGME.
137
157
*/
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;
158
static bool init_gpgme(const char *seckey,
159
const char *pubkey, const char *tempdir){
160
int ret;
144
161
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
162
gpgme_engine_info_t engine_info;
149
163
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
164
165
/*
166
* Helper function to insert pub and seckey to the engine keyring.
167
*/
168
bool import_key(const char *filename){
169
int fd;
170
gpgme_data_t pgp_data;
171
172
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
173
if(fd == -1){
174
perror("open");
175
return false;
176
}
177
178
rc = gpgme_data_new_from_fd(&pgp_data, fd);
179
if(rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
return false;
183
}
184
185
rc = gpgme_op_import(mc.ctx, pgp_data);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
189
return false;
190
}
191
192
ret = (int)TEMP_FAILURE_RETRY(close(fd));
193
if(ret == -1){
194
perror("close");
195
}
196
gpgme_data_release(pgp_data);
197
return true;
198
}
199
200
if(debug){
201
fprintf(stderr, "Initializing GPGME\n");
152
202
}
153
203
154
204
/* Init GPGME */
155
205
gpgme_check_version(NULL);
156
206
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
207
if(rc != GPG_ERR_NO_ERROR){
158
208
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
209
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
210
return false;
161
211
}
162
212
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){
213
/* Set GPGME home directory for the OpenPGP engine only */
214
rc = gpgme_get_engine_info(&engine_info);
215
if(rc != GPG_ERR_NO_ERROR){
166
216
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
217
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
218
return false;
169
219
}
170
220
while(engine_info != NULL){
171
221
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
222
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
223
engine_info->file_name, tempdir);
174
224
break;
175
225
}
176
226
engine_info = engine_info->next;
177
227
}
178
228
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
229
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
230
return false;
231
}
232
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&(mc.ctx));
235
if(rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
return false;
239
}
240
241
if(not import_key(pubkey) or not import_key(seckey)){
242
return false;
243
}
244
245
return true;
246
}
247
248
/*
249
* Decrypt OpenPGP data.
250
* Returns -1 on error
251
*/
252
static ssize_t pgp_packet_decrypt(const char *cryptotext,
253
size_t crypto_size,
254
char **plaintext){
255
gpgme_data_t dh_crypto, dh_plain;
256
gpgme_error_t rc;
257
ssize_t ret;
258
size_t plaintext_capacity = 0;
259
ssize_t plaintext_length = 0;
260
261
if(debug){
262
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
263
}
182
264
183
265
/* Create new GPGME data buffer from memory cryptotext */
184
266
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
267
0);
186
if (rc != GPG_ERR_NO_ERROR){
268
if(rc != GPG_ERR_NO_ERROR){
187
269
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
270
gpgme_strsource(rc), gpgme_strerror(rc));
189
271
return -1;
191
273
192
274
/* Create new empty GPGME data buffer for the plaintext */
193
275
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
276
if(rc != GPG_ERR_NO_ERROR){
195
277
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
278
gpgme_strsource(rc), gpgme_strerror(rc));
197
279
gpgme_data_release(dh_crypto);
198
280
return -1;
199
281
}
200
282
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
283
/* Decrypt data from the cryptotext data buffer to the plaintext
211
284
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
285
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
286
if(rc != GPG_ERR_NO_ERROR){
214
287
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
288
gpgme_strsource(rc), gpgme_strerror(rc));
216
289
plaintext_length = -1;
290
if(debug){
291
gpgme_decrypt_result_t result;
292
result = gpgme_op_decrypt_result(mc.ctx);
293
if(result == NULL){
294
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
295
} else {
296
fprintf(stderr, "Unsupported algorithm: %s\n",
297
result->unsupported_algorithm);
298
fprintf(stderr, "Wrong key usage: %u\n",
299
result->wrong_key_usage);
300
if(result->file_name != NULL){
301
fprintf(stderr, "File name: %s\n", result->file_name);
302
}
303
gpgme_recipient_t recipient;
304
recipient = result->recipients;
305
if(recipient){
306
while(recipient != NULL){
307
fprintf(stderr, "Public key algorithm: %s\n",
308
gpgme_pubkey_algo_name(recipient->pubkey_algo));
309
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
310
fprintf(stderr, "Secret key available: %s\n",
311
recipient->status == GPG_ERR_NO_SECKEY
312
? "No" : "Yes");
313
recipient = recipient->next;
314
}
315
}
316
}
317
}
217
318
goto decrypt_end;
218
319
}
219
320
221
322
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
222
323
}
223
324
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){
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
246
? "No" : "Yes");
247
recipient = recipient->next;
248
}
249
}
250
}
251
}
252
253
325
/* 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");
326
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
327
perror("gpgme_data_seek");
256
328
plaintext_length = -1;
257
329
goto decrypt_end;
258
330
}
259
331
260
332
*plaintext = NULL;
261
333
while(true){
262
plaintext_capacity = adjustbuffer(plaintext,
334
plaintext_capacity = incbuffer(plaintext,
263
335
(size_t)plaintext_length,
264
336
plaintext_capacity);
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
337
if(plaintext_capacity == 0){
338
perror("incbuffer");
267
339
plaintext_length = -1;
268
340
goto decrypt_end;
269
341
}
271
343
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
272
344
BUFFER_SIZE);
273
345
/* Print the data, if any */
274
if (ret == 0){
346
if(ret == 0){
275
347
/* EOF */
276
348
break;
277
349
}
282
354
}
283
355
plaintext_length += ret;
284
356
}
285
357
286
358
if(debug){
287
359
fprintf(stderr, "Decrypted password is: ");
288
360
for(ssize_t i = 0; i < plaintext_length; i++){
301
373
return plaintext_length;
302
374
}
303
375
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
306
if (ret == NULL)
376
static const char * safer_gnutls_strerror(int value){
377
const char *ret = gnutls_strerror(value); /* Spurious warning from
378
-Wunreachable-code */
379
if(ret == NULL)
307
380
ret = "(unknown)";
308
381
return ret;
309
382
}
314
387
fprintf(stderr, "GnuTLS: %s", string);
315
388
}
316
389
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
390
static int init_gnutls_global(const char *pubkeyfilename,
319
391
const char *seckeyfilename){
320
392
int ret;
321
393
324
396
}
325
397
326
398
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
399
if(ret != GNUTLS_E_SUCCESS){
400
fprintf(stderr, "GnuTLS global_init: %s\n",
401
safer_gnutls_strerror(ret));
330
402
return -1;
331
403
}
332
404
333
if (debug){
405
if(debug){
334
406
/* "Use a log level over 10 to enable all debugging options."
335
407
* - GnuTLS manual
336
408
*/
339
411
}
340
412
341
413
/* 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 ();
414
gnutls_certificate_allocate_credentials(&mc.cred);
415
if(ret != GNUTLS_E_SUCCESS){
416
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
417
from
418
-Wunreachable-code
419
*/
420
safer_gnutls_strerror(ret));
421
gnutls_global_deinit();
348
422
return -1;
349
423
}
350
424
351
425
if(debug){
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
426
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
427
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
354
428
seckeyfilename);
355
429
}
356
430
357
431
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
432
(mc.cred, pubkeyfilename, seckeyfilename,
359
433
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
434
if(ret != GNUTLS_E_SUCCESS){
361
435
fprintf(stderr,
362
436
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
437
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
438
fprintf(stderr, "The GnuTLS error is: %s\n",
365
439
safer_gnutls_strerror(ret));
366
440
goto globalfail;
367
441
}
368
442
369
443
/* 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
444
ret = gnutls_dh_params_init(&mc.dh_params);
445
if(ret != GNUTLS_E_SUCCESS){
446
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
447
" %s\n", safer_gnutls_strerror(ret));
448
goto globalfail;
449
}
450
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
451
if(ret != GNUTLS_E_SUCCESS){
452
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
453
safer_gnutls_strerror(ret));
454
goto globalfail;
455
}
456
457
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
458
385
459
return 0;
386
460
387
461
globalfail:
388
389
gnutls_certificate_free_credentials(mc->cred);
462
463
gnutls_certificate_free_credentials(mc.cred);
390
464
gnutls_global_deinit();
465
gnutls_dh_params_deinit(mc.dh_params);
391
466
return -1;
392
393
467
}
394
468
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
469
static int init_gnutls_session(gnutls_session_t *session){
397
470
int ret;
398
471
/* GnuTLS session creation */
399
472
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
473
if(ret != GNUTLS_E_SUCCESS){
401
474
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
475
safer_gnutls_strerror(ret));
403
476
}
404
477
405
478
{
406
479
const char *err;
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
480
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
481
if(ret != GNUTLS_E_SUCCESS){
409
482
fprintf(stderr, "Syntax error at: %s\n", err);
410
483
fprintf(stderr, "GnuTLS error: %s\n",
411
484
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
485
gnutls_deinit(*session);
413
486
return -1;
414
487
}
415
488
}
416
489
417
490
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
mc->cred);
419
if (ret != GNUTLS_E_SUCCESS) {
491
mc.cred);
492
if(ret != GNUTLS_E_SUCCESS){
420
493
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
494
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
495
gnutls_deinit(*session);
423
496
return -1;
424
497
}
425
498
426
499
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
428
GNUTLS_CERT_IGNORE);
500
gnutls_certificate_server_set_request(*session,
501
GNUTLS_CERT_IGNORE);
429
502
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
503
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
431
504
432
505
return 0;
433
506
}
439
512
/* Called when a Mandos server is found */
440
513
static int start_mandos_communication(const char *ip, uint16_t port,
441
514
AvahiIfIndex if_index,
442
mandos_context *mc){
515
int af){
443
516
int ret, tcp_sd;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
517
ssize_t sret;
518
union {
519
struct sockaddr_in in;
520
struct sockaddr_in6 in6;
521
} to;
445
522
char *buffer = NULL;
446
523
char *decrypted_buffer;
447
524
size_t buffer_length = 0;
449
526
ssize_t decrypted_buffer_size;
450
527
size_t written;
451
528
int retval = 0;
452
char interface[IF_NAMESIZE];
453
529
gnutls_session_t session;
454
455
ret = init_gnutls_session (mc, &session);
456
if (ret != 0){
530
int pf; /* Protocol family */
531
532
switch(af){
533
case AF_INET6:
534
pf = PF_INET6;
535
break;
536
case AF_INET:
537
pf = PF_INET;
538
break;
539
default:
540
fprintf(stderr, "Bad address family: %d\n", af);
541
return -1;
542
}
543
544
ret = init_gnutls_session(&session);
545
if(ret != 0){
457
546
return -1;
458
547
}
459
548
460
549
if(debug){
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
550
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
462
551
"\n", ip, port);
463
552
}
464
553
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
466
if(tcp_sd < 0) {
554
tcp_sd = socket(pf, SOCK_STREAM, 0);
555
if(tcp_sd < 0){
467
556
perror("socket");
468
557
return -1;
469
558
}
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);
477
}
478
559
479
560
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 ){
561
if(af == AF_INET6){
562
to.in6.sin6_family = (uint16_t)af;
563
ret = inet_pton(af, ip, &to.in6.sin6_addr);
564
} else { /* IPv4 */
565
to.in.sin_family = (sa_family_t)af;
566
ret = inet_pton(af, ip, &to.in.sin_addr);
567
}
568
if(ret < 0 ){
485
569
perror("inet_pton");
486
570
return -1;
487
571
}
489
573
fprintf(stderr, "Bad address: %s\n", ip);
490
574
return -1;
491
575
}
492
to.in6.sin6_port = htons(port); /* Spurious warning */
493
494
to.in6.sin6_scope_id = (uint32_t)if_index;
576
if(af == AF_INET6){
577
to.in6.sin6_port = htons(port); /* Spurious warnings from
578
-Wconversion and
579
-Wunreachable-code */
580
581
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
582
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
583
-Wunreachable-code*/
584
if(if_index == AVAHI_IF_UNSPEC){
585
fprintf(stderr, "An IPv6 link-local address is incomplete"
586
" without a network interface\n");
587
return -1;
588
}
589
/* Set the network interface number as scope */
590
to.in6.sin6_scope_id = (uint32_t)if_index;
591
}
592
} else {
593
to.in.sin_port = htons(port); /* Spurious warnings from
594
-Wconversion and
595
-Wunreachable-code */
596
}
495
597
496
598
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){
599
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
600
char interface[IF_NAMESIZE];
601
if(if_indextoname((unsigned int)if_index, interface) == NULL){
602
perror("if_indextoname");
603
} else {
604
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
605
ip, interface, port);
606
}
607
} else {
608
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
609
port);
610
}
611
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
612
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
613
const char *pcret;
614
if(af == AF_INET6){
615
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
616
sizeof(addrstr));
617
} else {
618
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
619
sizeof(addrstr));
620
}
621
if(pcret == NULL){
502
622
perror("inet_ntop");
503
623
} else {
504
624
if(strcmp(addrstr, ip) != 0){
507
627
}
508
628
}
509
629
510
ret = connect(tcp_sd, &to.in, sizeof(to));
511
if (ret < 0){
630
if(af == AF_INET6){
631
ret = connect(tcp_sd, &to.in6, sizeof(to));
632
} else {
633
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
634
}
635
if(ret < 0){
512
636
perror("connect");
513
637
return -1;
514
638
}
515
639
516
640
const char *out = mandos_protocol_version;
517
641
written = 0;
518
while (true){
642
while(true){
519
643
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
644
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
645
out_size - written));
522
if (ret == -1){
646
if(ret == -1){
523
647
perror("write");
524
648
retval = -1;
525
649
goto mandos_end;
528
652
if(written < out_size){
529
653
continue;
530
654
} else {
531
if (out == mandos_protocol_version){
655
if(out == mandos_protocol_version){
532
656
written = 0;
533
657
out = "\r\n";
534
658
} else {
536
660
}
537
661
}
538
662
}
539
663
540
664
if(debug){
541
665
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
666
}
543
667
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
668
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
669
546
670
do{
547
ret = gnutls_handshake (session);
671
ret = gnutls_handshake(session);
548
672
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
673
550
if (ret != GNUTLS_E_SUCCESS){
674
if(ret != GNUTLS_E_SUCCESS){
551
675
if(debug){
552
676
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
553
gnutls_perror (ret);
677
gnutls_perror(ret);
554
678
}
555
679
retval = -1;
556
680
goto mandos_end;
559
683
/* Read OpenPGP packet that contains the wanted password */
560
684
561
685
if(debug){
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
686
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
563
687
ip);
564
688
}
565
689
566
690
while(true){
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
691
buffer_capacity = incbuffer(&buffer, buffer_length,
568
692
buffer_capacity);
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
693
if(buffer_capacity == 0){
694
perror("incbuffer");
571
695
retval = -1;
572
696
goto mandos_end;
573
697
}
574
698
575
ret = gnutls_record_recv(session, buffer+buffer_length,
576
BUFFER_SIZE);
577
if (ret == 0){
699
sret = gnutls_record_recv(session, buffer+buffer_length,
700
BUFFER_SIZE);
701
if(sret == 0){
578
702
break;
579
703
}
580
if (ret < 0){
581
switch(ret){
704
if(sret < 0){
705
switch(sret){
582
706
case GNUTLS_E_INTERRUPTED:
583
707
case GNUTLS_E_AGAIN:
584
708
break;
585
709
case GNUTLS_E_REHANDSHAKE:
586
710
do{
587
ret = gnutls_handshake (session);
711
ret = gnutls_handshake(session);
588
712
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
if (ret < 0){
713
if(ret < 0){
590
714
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
591
gnutls_perror (ret);
715
gnutls_perror(ret);
592
716
retval = -1;
593
717
goto mandos_end;
594
718
}
597
721
fprintf(stderr, "Unknown error while reading data from"
598
722
" encrypted session with Mandos server\n");
599
723
retval = -1;
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
724
gnutls_bye(session, GNUTLS_SHUT_RDWR);
601
725
goto mandos_end;
602
726
}
603
727
} else {
604
buffer_length += (size_t) ret;
728
buffer_length += (size_t) sret;
605
729
}
606
730
}
607
731
609
733
fprintf(stderr, "Closing TLS session\n");
610
734
}
611
735
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
736
gnutls_bye(session, GNUTLS_SHUT_RDWR);
613
737
614
if (buffer_length > 0){
738
if(buffer_length > 0){
615
739
decrypted_buffer_size = pgp_packet_decrypt(buffer,
616
740
buffer_length,
617
&decrypted_buffer,
618
keydir);
619
if (decrypted_buffer_size >= 0){
741
&decrypted_buffer);
742
if(decrypted_buffer_size >= 0){
620
743
written = 0;
621
744
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
624
stdout);
745
ret = (int)fwrite(decrypted_buffer + written, 1,
746
(size_t)decrypted_buffer_size - written,
747
stdout);
625
748
if(ret == 0 and ferror(stdout)){
626
749
if(debug){
627
750
fprintf(stderr, "Error writing encrypted data: %s\n",
636
759
} else {
637
760
retval = -1;
638
761
}
762
} else {
763
retval = -1;
639
764
}
640
765
641
766
/* Shutdown procedure */
642
767
643
768
mandos_end:
644
769
free(buffer);
645
close(tcp_sd);
646
gnutls_deinit (session);
770
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
771
if(ret == -1){
772
perror("close");
773
}
774
gnutls_deinit(session);
647
775
return retval;
648
776
}
649
777
650
778
static void resolve_callback(AvahiSServiceResolver *r,
651
779
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
780
AvahiProtocol proto,
653
781
AvahiResolverEvent event,
654
782
const char *name,
655
783
const char *type,
660
788
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
789
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
790
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
791
AVAHI_GCC_UNUSED void* userdata){
665
792
assert(r);
666
793
667
794
/* Called whenever a service has been resolved successfully or
668
795
timed out */
669
796
670
switch (event) {
797
switch(event){
671
798
default:
672
799
case AVAHI_RESOLVER_FAILURE:
673
800
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
801
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
802
avahi_strerror(avahi_server_errno(mc.server)));
676
803
break;
677
804
678
805
case AVAHI_RESOLVER_FOUND:
681
808
avahi_address_snprint(ip, sizeof(ip), address);
682
809
if(debug){
683
810
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
685
interface, port);
811
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
812
ip, (intmax_t)interface, port);
686
813
}
687
int ret = start_mandos_communication(ip, port, interface, mc);
688
if (ret == 0){
689
avahi_simple_poll_quit(mc->simple_poll);
814
int ret = start_mandos_communication(ip, port, interface,
815
avahi_proto_to_af(proto));
816
if(ret == 0){
817
avahi_simple_poll_quit(mc.simple_poll);
690
818
}
691
819
}
692
820
}
693
821
avahi_s_service_resolver_free(r);
694
822
}
695
823
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;
824
static void browse_callback(AvahiSServiceBrowser *b,
825
AvahiIfIndex interface,
826
AvahiProtocol protocol,
827
AvahiBrowserEvent event,
828
const char *name,
829
const char *type,
830
const char *domain,
831
AVAHI_GCC_UNUSED AvahiLookupResultFlags
832
flags,
833
AVAHI_GCC_UNUSED void* userdata){
707
834
assert(b);
708
835
709
836
/* Called whenever a new services becomes available on the LAN or
710
837
is removed from the LAN */
711
838
712
switch (event) {
839
switch(event){
713
840
default:
714
841
case AVAHI_BROWSER_FAILURE:
715
842
716
843
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
844
avahi_strerror(avahi_server_errno(mc.server)));
845
avahi_simple_poll_quit(mc.simple_poll);
719
846
return;
720
847
721
848
case AVAHI_BROWSER_NEW:
724
851
the callback function is called the Avahi server will free the
725
852
resolver for us. */
726
853
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
854
if(!(avahi_s_service_resolver_new(mc.server, interface,
728
855
protocol, name, type, domain,
729
856
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
857
resolve_callback, NULL)))
731
858
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
859
name, avahi_strerror(avahi_server_errno(mc.server)));
733
860
break;
734
861
735
862
case AVAHI_BROWSER_REMOVE:
744
871
}
745
872
}
746
873
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){
750
char *tmp;
751
int ret = asprintf(&tmp, "%s/%s", first, second);
752
if(ret < 0){
753
return NULL;
754
}
755
return tmp;
874
static void handle_sigterm(__attribute__((unused)) int sig){
875
int old_errno = errno;
876
avahi_simple_poll_quit(mc.simple_poll);
877
errno = old_errno;
756
878
}
757
879
758
759
880
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
};
881
AvahiSServiceBrowser *sb = NULL;
882
int error;
883
int ret;
884
intmax_t tmpmax;
885
int numchars;
886
int exitcode = EXIT_SUCCESS;
887
const char *interface = "eth0";
888
struct ifreq network;
889
int sd;
890
uid_t uid;
891
gid_t gid;
892
char *connect_to = NULL;
893
char tempdir[] = "/tmp/mandosXXXXXX";
894
bool tempdir_created = false;
895
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
896
const char *seckey = PATHDIR "/" SECKEY;
897
const char *pubkey = PATHDIR "/" PUBKEY;
898
899
/* Initialize Mandos context */
900
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
901
.dh_bits = 1024, .priority = "SECURE256"
902
":!CTYPE-X.509:+CTYPE-OPENPGP" };
903
bool gnutls_initialized = false;
904
bool gpgme_initialized = false;
905
double delay = 2.5;
812
906
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);
907
struct sigaction old_sigterm_action;
908
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
909
910
{
911
struct argp_option options[] = {
912
{ .name = "debug", .key = 128,
913
.doc = "Debug mode", .group = 3 },
914
{ .name = "connect", .key = 'c',
915
.arg = "ADDRESS:PORT",
916
.doc = "Connect directly to a specific Mandos server",
917
.group = 1 },
918
{ .name = "interface", .key = 'i',
919
.arg = "NAME",
920
.doc = "Network interface that will be used to search for"
921
" Mandos servers",
922
.group = 1 },
923
{ .name = "seckey", .key = 's',
924
.arg = "FILE",
925
.doc = "OpenPGP secret key file base name",
926
.group = 1 },
927
{ .name = "pubkey", .key = 'p',
928
.arg = "FILE",
929
.doc = "OpenPGP public key file base name",
930
.group = 2 },
931
{ .name = "dh-bits", .key = 129,
932
.arg = "BITS",
933
.doc = "Bit length of the prime number used in the"
934
" Diffie-Hellman key exchange",
935
.group = 2 },
936
{ .name = "priority", .key = 130,
937
.arg = "STRING",
938
.doc = "GnuTLS priority string for the TLS handshake",
939
.group = 1 },
940
{ .name = "delay", .key = 131,
941
.arg = "SECONDS",
942
.doc = "Maximum delay to wait for interface startup",
943
.group = 2 },
944
{ .name = NULL }
945
};
946
947
error_t parse_opt(int key, char *arg,
948
struct argp_state *state){
949
switch(key){
950
case 128: /* --debug */
951
debug = true;
952
break;
953
case 'c': /* --connect */
954
connect_to = arg;
955
break;
956
case 'i': /* --interface */
957
interface = arg;
958
break;
959
case 's': /* --seckey */
960
seckey = arg;
961
break;
962
case 'p': /* --pubkey */
963
pubkey = arg;
964
break;
965
case 129: /* --dh-bits */
966
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
967
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
968
or arg[numchars] != '\0'){
969
fprintf(stderr, "Bad number of DH bits\n");
970
exit(EXIT_FAILURE);
971
}
972
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
973
break;
974
case 130: /* --priority */
975
mc.priority = arg;
976
break;
977
case 131: /* --delay */
978
ret = sscanf(arg, "%lf%n", &delay, &numchars);
979
if(ret < 1 or arg[numchars] != '\0'){
980
fprintf(stderr, "Bad delay\n");
981
exit(EXIT_FAILURE);
982
}
983
break;
984
case ARGP_KEY_ARG:
985
argp_usage(state);
986
case ARGP_KEY_END:
987
break;
988
default:
989
return ARGP_ERR_UNKNOWN;
990
}
991
return 0;
992
}
993
994
struct argp argp = { .options = options, .parser = parse_opt,
995
.args_doc = "",
996
.doc = "Mandos client -- Get and decrypt"
997
" passwords from a Mandos server" };
998
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
999
if(ret == ARGP_ERR_UNKNOWN){
1000
fprintf(stderr, "Unknown error while parsing arguments\n");
1001
exitcode = EXIT_FAILURE;
1002
goto end;
1003
}
1004
}
1005
1006
/* If the interface is down, bring it up */
1007
if(interface[0] != '\0'){
1008
#ifdef __linux__
1009
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1010
messages to mess up the prompt */
1011
ret = klogctl(8, NULL, 5);
1012
bool restore_loglevel = true;
1013
if(ret == -1){
1014
restore_loglevel = false;
1015
perror("klogctl");
1016
}
1017
#endif
1018
1019
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1020
if(sd < 0){
1021
perror("socket");
1022
exitcode = EXIT_FAILURE;
1023
#ifdef __linux__
1024
if(restore_loglevel){
1025
ret = klogctl(7, NULL, 0);
1026
if(ret == -1){
1027
perror("klogctl");
1028
}
1029
}
1030
#endif
1031
goto end;
1032
}
1033
strcpy(network.ifr_name, interface);
1034
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1035
if(ret == -1){
1036
perror("ioctl SIOCGIFFLAGS");
1037
#ifdef __linux__
1038
if(restore_loglevel){
1039
ret = klogctl(7, NULL, 0);
1040
if(ret == -1){
1041
perror("klogctl");
1042
}
1043
}
1044
#endif
1045
exitcode = EXIT_FAILURE;
1046
goto end;
1047
}
1048
if((network.ifr_flags & IFF_UP) == 0){
1049
network.ifr_flags |= IFF_UP;
1050
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1051
if(ret == -1){
1052
perror("ioctl SIOCSIFFLAGS");
1053
exitcode = EXIT_FAILURE;
1054
#ifdef __linux__
1055
if(restore_loglevel){
1056
ret = klogctl(7, NULL, 0);
1057
if(ret == -1){
1058
perror("klogctl");
843
1059
}
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
1060
}
855
return 0;
856
}
857
858
struct argp argp = { .options = options, .parser = parse_opt,
859
.args_doc = "",
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
866
goto end;
867
}
868
}
869
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
874
goto end;
875
}
876
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
881
goto end;
882
}
883
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
if (ret == -1){
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
888
goto end;
889
} else {
890
gnutls_initalized = true;
891
}
892
893
/* If the interface is down, bring it up */
894
{
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
896
if(sd < 0) {
897
perror("socket");
898
exitcode = EXIT_FAILURE;
899
goto end;
900
}
901
strcpy(network.ifr_name, interface);
1061
#endif
1062
goto end;
1063
}
1064
}
1065
/* sleep checking until interface is running */
1066
for(int i=0; i < delay * 4; i++){
902
1067
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
1068
if(ret == -1){
904
1069
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
906
goto end;
907
}
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
if(ret == -1){
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
914
goto end;
915
}
916
}
917
close(sd);
918
}
919
920
uid = getuid();
921
gid = getgid();
922
923
ret = setuid(uid);
924
if (ret == -1){
925
perror("setuid");
926
}
927
928
setgid(gid);
929
if (ret == -1){
930
perror("setgid");
931
}
932
1070
} else if(network.ifr_flags & IFF_RUNNING){
1071
break;
1072
}
1073
struct timespec sleeptime = { .tv_nsec = 250000000 };
1074
ret = nanosleep(&sleeptime, NULL);
1075
if(ret == -1 and errno != EINTR){
1076
perror("nanosleep");
1077
}
1078
}
1079
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1080
if(ret == -1){
1081
perror("close");
1082
}
1083
#ifdef __linux__
1084
if(restore_loglevel){
1085
/* Restores kernel loglevel to default */
1086
ret = klogctl(7, NULL, 0);
1087
if(ret == -1){
1088
perror("klogctl");
1089
}
1090
}
1091
#endif
1092
}
1093
1094
uid = getuid();
1095
gid = getgid();
1096
1097
errno = 0;
1098
setgid(gid);
1099
if(ret == -1){
1100
perror("setgid");
1101
}
1102
1103
ret = setuid(uid);
1104
if(ret == -1){
1105
perror("setuid");
1106
}
1107
1108
ret = init_gnutls_global(pubkey, seckey);
1109
if(ret == -1){
1110
fprintf(stderr, "init_gnutls_global failed\n");
1111
exitcode = EXIT_FAILURE;
1112
goto end;
1113
} else {
1114
gnutls_initialized = true;
1115
}
1116
1117
if(mkdtemp(tempdir) == NULL){
1118
perror("mkdtemp");
1119
goto end;
1120
}
1121
tempdir_created = true;
1122
1123
if(not init_gpgme(pubkey, seckey, tempdir)){
1124
fprintf(stderr, "init_gpgme failed\n");
1125
exitcode = EXIT_FAILURE;
1126
goto end;
1127
} else {
1128
gpgme_initialized = true;
1129
}
1130
1131
if(interface[0] != '\0'){
933
1132
if_index = (AvahiIfIndex) if_nametoindex(interface);
934
1133
if(if_index == 0){
935
1134
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
1135
exitcode = EXIT_FAILURE;
1136
goto end;
1137
}
1138
}
1139
1140
if(connect_to != NULL){
1141
/* Connect directly, do not use Zeroconf */
1142
/* (Mainly meant for debugging) */
1143
char *address = strrchr(connect_to, ':');
1144
if(address == NULL){
1145
fprintf(stderr, "No colon in address\n");
1146
exitcode = EXIT_FAILURE;
1147
goto end;
1148
}
1149
uint16_t port;
1150
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1151
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1152
or address[numchars+1] != '\0'){
1153
fprintf(stderr, "Bad port number\n");
1154
exitcode = EXIT_FAILURE;
1155
goto end;
1156
}
1157
port = (uint16_t)tmpmax;
1158
*address = '\0';
1159
address = connect_to;
1160
/* Colon in address indicates IPv6 */
1161
int af;
1162
if(strchr(address, ':') != NULL){
1163
af = AF_INET6;
1164
} else {
1165
af = AF_INET;
1166
}
1167
ret = start_mandos_communication(address, port, if_index, af);
1168
if(ret < 0){
1169
exitcode = EXIT_FAILURE;
1170
} else {
1171
exitcode = EXIT_SUCCESS;
1172
}
1173
goto end;
1174
}
1175
1176
if(not debug){
1177
avahi_set_log_function(empty_log);
1178
}
1179
1180
/* Initialize the pseudo-RNG for Avahi */
1181
srand((unsigned int) time(NULL));
1182
1183
/* Allocate main Avahi loop object */
1184
mc.simple_poll = avahi_simple_poll_new();
1185
if(mc.simple_poll == NULL){
1186
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1187
exitcode = EXIT_FAILURE;
1188
goto end;
1189
}
1190
1191
{
1192
AvahiServerConfig config;
1193
/* Do not publish any local Zeroconf records */
1194
avahi_server_config_init(&config);
1195
config.publish_hinfo = 0;
1196
config.publish_addresses = 0;
1197
config.publish_workstation = 0;
1198
config.publish_domain = 0;
1199
1200
/* Allocate a new server */
1201
mc.server = avahi_server_new(avahi_simple_poll_get
1202
(mc.simple_poll), &config, NULL,
1203
NULL, &error);
1204
1205
/* Free the Avahi configuration data */
1206
avahi_server_config_free(&config);
1207
}
1208
1209
/* Check if creating the Avahi server object succeeded */
1210
if(mc.server == NULL){
1211
fprintf(stderr, "Failed to create Avahi server: %s\n",
1212
avahi_strerror(error));
1213
exitcode = EXIT_FAILURE;
1214
goto end;
1215
}
1216
1217
/* Create the Avahi service browser */
1218
sb = avahi_s_service_browser_new(mc.server, if_index,
1219
AVAHI_PROTO_INET6, "_mandos._tcp",
1220
NULL, 0, browse_callback, NULL);
1221
if(sb == NULL){
1222
fprintf(stderr, "Failed to create service browser: %s\n",
1223
avahi_strerror(avahi_server_errno(mc.server)));
1224
exitcode = EXIT_FAILURE;
1225
goto end;
1226
}
1227
1228
sigemptyset(&sigterm_action.sa_mask);
1229
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1230
if(ret == -1){
1231
perror("sigaddset");
1232
exitcode = EXIT_FAILURE;
1233
goto end;
1234
}
1235
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1236
if(ret == -1){
1237
perror("sigaction");
1238
exitcode = EXIT_FAILURE;
1239
goto end;
1240
}
1241
1242
/* Run the main loop */
1243
1244
if(debug){
1245
fprintf(stderr, "Starting Avahi loop search\n");
1246
}
1247
1248
avahi_simple_poll_loop(mc.simple_poll);
1249
1028
1250
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;
1251
1252
if(debug){
1253
fprintf(stderr, "%s exiting\n", argv[0]);
1254
}
1255
1256
/* Cleanup things */
1257
if(sb != NULL)
1258
avahi_s_service_browser_free(sb);
1259
1260
if(mc.server != NULL)
1261
avahi_server_free(mc.server);
1262
1263
if(mc.simple_poll != NULL)
1264
avahi_simple_poll_free(mc.simple_poll);
1265
1266
if(gnutls_initialized){
1267
gnutls_certificate_free_credentials(mc.cred);
1268
gnutls_global_deinit();
1269
gnutls_dh_params_deinit(mc.dh_params);
1270
}
1271
1272
if(gpgme_initialized){
1273
gpgme_release(mc.ctx);
1274
}
1275
1276
/* Removes the temp directory used by GPGME */
1277
if(tempdir_created){
1278
DIR *d;
1279
struct dirent *direntry;
1280
d = opendir(tempdir);
1281
if(d == NULL){
1282
if(errno != ENOENT){
1283
perror("opendir");
1284
}
1285
} else {
1286
while(true){
1287
direntry = readdir(d);
1288
if(direntry == NULL){
1289
break;
1290
}
1291
/* Skip "." and ".." */
1292
if(direntry->d_name[0] == '.'
1293
and (direntry->d_name[1] == '\0'
1294
or (direntry->d_name[1] == '.'
1295
and direntry->d_name[2] == '\0'))){
1296
continue;
1297
}
1298
char *fullname = NULL;
1299
ret = asprintf(&fullname, "%s/%s", tempdir,
1300
direntry->d_name);
1301
if(ret < 0){
1302
perror("asprintf");
1303
continue;
1304
}
1305
ret = remove(fullname);
1306
if(ret == -1){
1307
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1308
strerror(errno));
1309
}
1310
free(fullname);
1311
}
1312
closedir(d);
1313
}
1314
ret = rmdir(tempdir);
1315
if(ret == -1 and errno != ENOENT){
1316
perror("rmdir");
1317
}
1318
}
1319
1320
return exitcode;
1052
1321
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0