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- Committer: Teddy Hogeborn
- Date: 2008-08-31 15:06:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20080831150639-tqdkyea3b9p3rou7
* Makefile: Make all DocBook rules include legalnotice.xml as a
dependency.
* legalnotice.xml: New file with just the <legalnotice> tag in it.
* mandos-clients.conf.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* mandos-keygen.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos-conf.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos.xml (/refentry/refentryinfo/legalnotice): - '' -
* overview.xml: Changed root node tag name in DOCTYPE declaration.
* plugin-runner.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-prompt.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-request.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
dependency.
* legalnotice.xml: New file with just the <legalnotice> tag in it.
* mandos-clients.conf.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* mandos-keygen.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos-conf.xml (/refentry/refentryinfo/legalnotice): - '' -
* mandos.xml (/refentry/refentryinfo/legalnotice): - '' -
* overview.xml: Changed root node tag name in DOCTYPE declaration.
* plugin-runner.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-prompt.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
* plugins.d/password-request.xml (/refentry): Add XInclude namespace.
(/refentry/refentryinfo/legalnotice): Replaced with an inclusion of
"legalnotice.xml".
- files added:
- plugins.d/usplash
- 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:
- .bzrignore
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, sigaction,
84
sig_atomic_t */
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){
217
if (debug){
298
218
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
301
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
222
} else {
303
223
fprintf(stderr, "Unsupported algorithm: %s\n",
330
250
}
331
251
332
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
333
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
334
perror("gpgme_data_seek");
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
335
255
plaintext_length = -1;
336
256
goto decrypt_end;
337
257
}
338
258
339
259
*plaintext = NULL;
340
260
while(true){
341
plaintext_capacity = incbuffer(plaintext,
261
plaintext_capacity = adjustbuffer(plaintext,
342
262
(size_t)plaintext_length,
343
263
plaintext_capacity);
344
if(plaintext_capacity == 0){
345
perror("incbuffer");
264
if (plaintext_capacity == 0){
265
perror("adjustbuffer");
346
266
plaintext_length = -1;
347
267
goto decrypt_end;
348
268
}
350
270
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
351
271
BUFFER_SIZE);
352
272
/* Print the data, if any */
353
if(ret == 0){
273
if (ret == 0){
354
274
/* EOF */
355
275
break;
356
276
}
361
281
}
362
282
plaintext_length += ret;
363
283
}
364
284
365
285
if(debug){
366
286
fprintf(stderr, "Decrypted password is: ");
367
287
for(ssize_t i = 0; i < plaintext_length; i++){
380
300
return plaintext_length;
381
301
}
382
302
383
static const char * safer_gnutls_strerror(int value){
384
const char *ret = gnutls_strerror(value); /* Spurious warning from
385
-Wunreachable-code */
386
if(ret == NULL)
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
387
306
ret = "(unknown)";
388
307
return ret;
389
308
}
394
313
fprintf(stderr, "GnuTLS: %s", string);
395
314
}
396
315
397
static int init_gnutls_global(const char *pubkeyfilename,
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfilename,
398
318
const char *seckeyfilename){
399
319
int ret;
400
320
403
323
}
404
324
405
325
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
409
329
return -1;
410
330
}
411
331
412
if(debug){
332
if (debug){
413
333
/* "Use a log level over 10 to enable all debugging options."
414
334
* - GnuTLS manual
415
335
*/
418
338
}
419
339
420
340
/* OpenPGP credentials */
421
gnutls_certificate_allocate_credentials(&mc.cred);
422
if(ret != GNUTLS_E_SUCCESS){
423
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
424
from
425
-Wunreachable-code
426
*/
427
safer_gnutls_strerror(ret));
428
gnutls_global_deinit();
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
429
347
return -1;
430
348
}
431
349
432
350
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" 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,
435
353
seckeyfilename);
436
354
}
437
355
438
356
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
357
(mc->cred, pubkeyfilename, seckeyfilename,
440
358
GNUTLS_OPENPGP_FMT_BASE64);
441
if(ret != GNUTLS_E_SUCCESS){
359
if (ret != GNUTLS_E_SUCCESS) {
442
360
fprintf(stderr,
443
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
363
fprintf(stdout, "The GnuTLS error is: %s\n",
446
364
safer_gnutls_strerror(ret));
447
365
goto globalfail;
448
366
}
449
367
450
368
/* GnuTLS server initialization */
451
ret = gnutls_dh_params_init(&mc.dh_params);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
454
" %s\n", safer_gnutls_strerror(ret));
455
goto globalfail;
456
}
457
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
458
if(ret != GNUTLS_E_SUCCESS){
459
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
460
safer_gnutls_strerror(ret));
461
goto globalfail;
462
}
463
464
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
465
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
466
384
return 0;
467
385
468
386
globalfail:
469
470
gnutls_certificate_free_credentials(mc.cred);
387
388
gnutls_certificate_free_credentials(mc->cred);
471
389
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
473
390
return -1;
391
474
392
}
475
393
476
static int init_gnutls_session(gnutls_session_t *session){
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
477
396
int ret;
478
397
/* GnuTLS session creation */
479
398
ret = gnutls_init(session, GNUTLS_SERVER);
480
if(ret != GNUTLS_E_SUCCESS){
399
if (ret != GNUTLS_E_SUCCESS){
481
400
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
401
safer_gnutls_strerror(ret));
483
402
}
484
403
485
404
{
486
405
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
488
if(ret != GNUTLS_E_SUCCESS){
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
489
408
fprintf(stderr, "Syntax error at: %s\n", err);
490
409
fprintf(stderr, "GnuTLS error: %s\n",
491
410
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
411
gnutls_deinit (*session);
493
412
return -1;
494
413
}
495
414
}
496
415
497
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
499
if(ret != GNUTLS_E_SUCCESS){
417
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
500
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
420
safer_gnutls_strerror(ret));
502
gnutls_deinit(*session);
421
gnutls_deinit (*session);
503
422
return -1;
504
423
}
505
424
506
425
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
509
428
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
511
430
512
431
return 0;
513
432
}
519
438
/* Called when a Mandos server is found */
520
439
static int start_mandos_communication(const char *ip, uint16_t port,
521
440
AvahiIfIndex if_index,
522
int af){
441
mandos_context *mc){
523
442
int ret, tcp_sd;
524
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
529
444
char *buffer = NULL;
530
445
char *decrypted_buffer;
531
446
size_t buffer_length = 0;
533
448
ssize_t decrypted_buffer_size;
534
449
size_t written;
535
450
int retval = 0;
451
char interface[IF_NAMESIZE];
536
452
gnutls_session_t session;
537
int pf; /* Protocol family */
538
539
switch(af){
540
case AF_INET6:
541
pf = PF_INET6;
542
break;
543
case AF_INET:
544
pf = PF_INET;
545
break;
546
default:
547
fprintf(stderr, "Bad address family: %d\n", af);
548
return -1;
549
}
550
551
ret = init_gnutls_session(&session);
552
if(ret != 0){
453
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
553
456
return -1;
554
457
}
555
458
556
459
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
558
461
"\n", ip, port);
559
462
}
560
463
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
if(tcp_sd < 0){
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
465
if(tcp_sd < 0) {
563
466
perror("socket");
564
467
return -1;
565
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
}
566
477
567
478
memset(&to, 0, sizeof(to));
568
if(af == AF_INET6){
569
to.in6.sin6_family = (sa_family_t)af;
570
ret = inet_pton(af, ip, &to.in6.sin6_addr);
571
} else { /* IPv4 */
572
to.in.sin_family = (sa_family_t)af;
573
ret = inet_pton(af, ip, &to.in.sin_addr);
574
}
575
if(ret < 0 ){
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 ){
576
484
perror("inet_pton");
577
485
return -1;
578
486
}
580
488
fprintf(stderr, "Bad address: %s\n", ip);
581
489
return -1;
582
490
}
583
if(af == AF_INET6){
584
to.in6.sin6_port = htons(port); /* Spurious warnings from
585
-Wconversion and
586
-Wunreachable-code */
587
588
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
589
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
590
-Wunreachable-code*/
591
if(if_index == AVAHI_IF_UNSPEC){
592
fprintf(stderr, "An IPv6 link-local address is incomplete"
593
" without a network interface\n");
594
return -1;
595
}
596
/* Set the network interface number as scope */
597
to.in6.sin6_scope_id = (uint32_t)if_index;
598
}
599
} else {
600
to.in.sin_port = htons(port); /* Spurious warnings from
601
-Wconversion and
602
-Wunreachable-code */
603
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
492
493
to.in6.sin6_scope_id = (uint32_t)if_index;
604
494
605
495
if(debug){
606
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
607
char interface[IF_NAMESIZE];
608
if(if_indextoname((unsigned int)if_index, interface) == NULL){
609
perror("if_indextoname");
610
} else {
611
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
612
ip, interface, port);
613
}
614
} else {
615
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
port);
617
}
618
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
619
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
const char *pcret;
621
if(af == AF_INET6){
622
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
sizeof(addrstr));
624
} else {
625
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
626
sizeof(addrstr));
627
}
628
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){
629
501
perror("inet_ntop");
630
502
} else {
631
503
if(strcmp(addrstr, ip) != 0){
634
506
}
635
507
}
636
508
637
if(af == AF_INET6){
638
ret = connect(tcp_sd, &to.in6, sizeof(to));
639
} else {
640
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
641
}
642
if(ret < 0){
509
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
643
511
perror("connect");
644
512
return -1;
645
513
}
646
514
647
515
const char *out = mandos_protocol_version;
648
516
written = 0;
649
while(true){
517
while (true){
650
518
size_t out_size = strlen(out);
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
520
out_size - written));
653
if(ret == -1){
521
if (ret == -1){
654
522
perror("write");
655
523
retval = -1;
656
524
goto mandos_end;
659
527
if(written < out_size){
660
528
continue;
661
529
} else {
662
if(out == mandos_protocol_version){
530
if (out == mandos_protocol_version){
663
531
written = 0;
664
532
out = "\r\n";
665
533
} else {
667
535
}
668
536
}
669
537
}
670
538
671
539
if(debug){
672
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
541
}
674
542
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
677
545
do{
678
ret = gnutls_handshake(session);
546
ret = gnutls_handshake (session);
679
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
548
681
if(ret != GNUTLS_E_SUCCESS){
549
if (ret != GNUTLS_E_SUCCESS){
682
550
if(debug){
683
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
684
gnutls_perror(ret);
552
gnutls_perror (ret);
685
553
}
686
554
retval = -1;
687
555
goto mandos_end;
690
558
/* Read OpenPGP packet that contains the wanted password */
691
559
692
560
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
694
562
ip);
695
563
}
696
564
697
565
while(true){
698
buffer_capacity = incbuffer(&buffer, buffer_length,
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
699
567
buffer_capacity);
700
if(buffer_capacity == 0){
701
perror("incbuffer");
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
702
570
retval = -1;
703
571
goto mandos_end;
704
572
}
705
573
706
sret = gnutls_record_recv(session, buffer+buffer_length,
707
BUFFER_SIZE);
708
if(sret == 0){
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
709
577
break;
710
578
}
711
if(sret < 0){
712
switch(sret){
579
if (ret < 0){
580
switch(ret){
713
581
case GNUTLS_E_INTERRUPTED:
714
582
case GNUTLS_E_AGAIN:
715
583
break;
716
584
case GNUTLS_E_REHANDSHAKE:
717
585
do{
718
ret = gnutls_handshake(session);
586
ret = gnutls_handshake (session);
719
587
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
if(ret < 0){
588
if (ret < 0){
721
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
722
gnutls_perror(ret);
590
gnutls_perror (ret);
723
591
retval = -1;
724
592
goto mandos_end;
725
593
}
728
596
fprintf(stderr, "Unknown error while reading data from"
729
597
" encrypted session with Mandos server\n");
730
598
retval = -1;
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
732
600
goto mandos_end;
733
601
}
734
602
} else {
735
buffer_length += (size_t) sret;
603
buffer_length += (size_t) ret;
736
604
}
737
605
}
738
606
740
608
fprintf(stderr, "Closing TLS session\n");
741
609
}
742
610
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
744
612
745
if(buffer_length > 0){
613
if (buffer_length > 0){
746
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
615
buffer_length,
748
&decrypted_buffer);
749
if(decrypted_buffer_size >= 0){
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
750
619
written = 0;
751
620
while(written < (size_t) decrypted_buffer_size){
752
ret = (int)fwrite(decrypted_buffer + written, 1,
753
(size_t)decrypted_buffer_size - written,
754
stdout);
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
755
624
if(ret == 0 and ferror(stdout)){
756
625
if(debug){
757
626
fprintf(stderr, "Error writing encrypted data: %s\n",
774
643
775
644
mandos_end:
776
645
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
780
}
781
gnutls_deinit(session);
646
close(tcp_sd);
647
gnutls_deinit (session);
782
648
return retval;
783
649
}
784
650
785
651
static void resolve_callback(AvahiSServiceResolver *r,
786
652
AvahiIfIndex interface,
787
AvahiProtocol proto,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
788
654
AvahiResolverEvent event,
789
655
const char *name,
790
656
const char *type,
795
661
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
662
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
663
flags,
798
AVAHI_GCC_UNUSED void* userdata){
664
void* userdata) {
665
mandos_context *mc = userdata;
799
666
assert(r);
800
667
801
668
/* Called whenever a service has been resolved successfully or
802
669
timed out */
803
670
804
switch(event){
671
switch (event) {
805
672
default:
806
673
case AVAHI_RESOLVER_FAILURE:
807
674
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
675
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
676
avahi_strerror(avahi_server_errno(mc->server)));
810
677
break;
811
678
812
679
case AVAHI_RESOLVER_FOUND:
815
682
avahi_address_snprint(ip, sizeof(ip), address);
816
683
if(debug){
817
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
820
687
}
821
int ret = start_mandos_communication(ip, port, interface,
822
avahi_proto_to_af(proto));
823
if(ret == 0){
824
avahi_simple_poll_quit(mc.simple_poll);
688
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
690
avahi_simple_poll_quit(mc->simple_poll);
825
691
}
826
692
}
827
693
}
828
694
avahi_s_service_resolver_free(r);
829
695
}
830
696
831
static void browse_callback(AvahiSServiceBrowser *b,
832
AvahiIfIndex interface,
833
AvahiProtocol protocol,
834
AvahiBrowserEvent event,
835
const char *name,
836
const char *type,
837
const char *domain,
838
AVAHI_GCC_UNUSED AvahiLookupResultFlags
839
flags,
840
AVAHI_GCC_UNUSED void* userdata){
697
static void browse_callback( AvahiSServiceBrowser *b,
698
AvahiIfIndex interface,
699
AvahiProtocol protocol,
700
AvahiBrowserEvent event,
701
const char *name,
702
const char *type,
703
const char *domain,
704
AVAHI_GCC_UNUSED AvahiLookupResultFlags
705
flags,
706
void* userdata) {
707
mandos_context *mc = userdata;
841
708
assert(b);
842
709
843
710
/* Called whenever a new services becomes available on the LAN or
844
711
is removed from the LAN */
845
712
846
switch(event){
713
switch (event) {
847
714
default:
848
715
case AVAHI_BROWSER_FAILURE:
849
716
850
717
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
718
avahi_strerror(avahi_server_errno(mc->server)));
719
avahi_simple_poll_quit(mc->simple_poll);
853
720
return;
854
721
855
722
case AVAHI_BROWSER_NEW:
858
725
the callback function is called the Avahi server will free the
859
726
resolver for us. */
860
727
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
729
protocol, name, type, domain,
730
AVAHI_PROTO_INET6, 0,
731
resolve_callback, mc)))
864
732
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
733
name, avahi_strerror(avahi_server_errno(mc->server)));
866
734
break;
867
735
868
736
case AVAHI_BROWSER_REMOVE:
877
745
}
878
746
}
879
747
880
sig_atomic_t quit_now = 0;
881
882
/* stop main loop after sigterm has been called */
883
static void handle_sigterm(__attribute__((unused)) int sig){
884
if(quit_now){
885
return;
886
}
887
quit_now = 1;
888
int old_errno = errno;
889
if(mc.simple_poll != NULL){
890
avahi_simple_poll_quit(mc.simple_poll);
891
}
892
errno = old_errno;
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
893
757
}
894
758
759
895
760
int main(int argc, char *argv[]){
896
AvahiSServiceBrowser *sb = NULL;
897
int error;
898
int ret;
899
intmax_t tmpmax;
900
char *tmp;
901
int exitcode = EXIT_SUCCESS;
902
const char *interface = "eth0";
903
struct ifreq network;
904
int sd;
905
uid_t uid;
906
gid_t gid;
907
char *connect_to = NULL;
908
char tempdir[] = "/tmp/mandosXXXXXX";
909
bool tempdir_created = false;
910
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
911
const char *seckey = PATHDIR "/" SECKEY;
912
const char *pubkey = PATHDIR "/" PUBKEY;
913
914
bool gnutls_initialized = false;
915
bool gpgme_initialized = false;
916
float delay = 2.5f;
917
918
struct sigaction old_sigterm_action;
919
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
921
{
922
struct argp_option options[] = {
923
{ .name = "debug", .key = 128,
924
.doc = "Debug mode", .group = 3 },
925
{ .name = "connect", .key = 'c',
926
.arg = "ADDRESS:PORT",
927
.doc = "Connect directly to a specific Mandos server",
928
.group = 1 },
929
{ .name = "interface", .key = 'i',
930
.arg = "NAME",
931
.doc = "Network interface that will be used to search for"
932
" Mandos servers",
933
.group = 1 },
934
{ .name = "seckey", .key = 's',
935
.arg = "FILE",
936
.doc = "OpenPGP secret key file base name",
937
.group = 1 },
938
{ .name = "pubkey", .key = 'p',
939
.arg = "FILE",
940
.doc = "OpenPGP public key file base name",
941
.group = 2 },
942
{ .name = "dh-bits", .key = 129,
943
.arg = "BITS",
944
.doc = "Bit length of the prime number used in the"
945
" Diffie-Hellman key exchange",
946
.group = 2 },
947
{ .name = "priority", .key = 130,
948
.arg = "STRING",
949
.doc = "GnuTLS priority string for the TLS handshake",
950
.group = 1 },
951
{ .name = "delay", .key = 131,
952
.arg = "SECONDS",
953
.doc = "Maximum delay to wait for interface startup",
954
.group = 2 },
955
{ .name = NULL }
956
};
957
958
error_t parse_opt(int key, char *arg,
959
struct argp_state *state){
960
switch(key){
961
case 128: /* --debug */
962
debug = true;
963
break;
964
case 'c': /* --connect */
965
connect_to = arg;
966
break;
967
case 'i': /* --interface */
968
interface = arg;
969
break;
970
case 's': /* --seckey */
971
seckey = arg;
972
break;
973
case 'p': /* --pubkey */
974
pubkey = arg;
975
break;
976
case 129: /* --dh-bits */
977
errno = 0;
978
tmpmax = strtoimax(arg, &tmp, 10);
979
if(errno != 0 or tmp == arg or *tmp != '\0'
980
or tmpmax != (typeof(mc.dh_bits))tmpmax){
981
fprintf(stderr, "Bad number of DH bits\n");
982
exit(EXIT_FAILURE);
983
}
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
break;
986
case 130: /* --priority */
987
mc.priority = arg;
988
break;
989
case 131: /* --delay */
990
errno = 0;
991
delay = strtof(arg, &tmp);
992
if(errno != 0 or tmp == arg or *tmp != '\0'){
993
fprintf(stderr, "Bad delay\n");
994
exit(EXIT_FAILURE);
995
}
996
break;
997
case ARGP_KEY_ARG:
998
argp_usage(state);
999
case ARGP_KEY_END:
1000
break;
1001
default:
1002
return ARGP_ERR_UNKNOWN;
1003
}
1004
return 0;
1005
}
1006
1007
struct argp argp = { .options = options, .parser = parse_opt,
1008
.args_doc = "",
1009
.doc = "Mandos client -- Get and decrypt"
1010
" passwords from a Mandos server" };
1011
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1012
if(ret == ARGP_ERR_UNKNOWN){
1013
fprintf(stderr, "Unknown error while parsing arguments\n");
1014
exitcode = EXIT_FAILURE;
1015
goto end;
1016
}
1017
}
1018
1019
if(not debug){
1020
avahi_set_log_function(empty_log);
1021
}
1022
1023
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1024
from the signal handler */
1025
/* Initialize the pseudo-RNG for Avahi */
1026
srand((unsigned int) time(NULL));
1027
mc.simple_poll = avahi_simple_poll_new();
1028
if(mc.simple_poll == NULL){
1029
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1030
exitcode = EXIT_FAILURE;
1031
goto end;
1032
}
1033
1034
sigemptyset(&sigterm_action.sa_mask);
1035
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
if(ret == -1){
1037
perror("sigaddset");
1038
exitcode = EXIT_FAILURE;
1039
goto end;
1040
}
1041
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
if(ret == -1){
1043
perror("sigaddset");
1044
exitcode = EXIT_FAILURE;
1045
goto end;
1046
}
1047
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
if(ret == -1){
1049
perror("sigaddset");
1050
exitcode = EXIT_FAILURE;
1051
goto end;
1052
}
1053
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
if(ret == -1){
1055
perror("sigaction");
1056
exitcode = EXIT_FAILURE;
1057
goto end;
1058
}
1059
1060
/* If the interface is down, bring it up */
1061
if(interface[0] != '\0'){
1062
#ifdef __linux__
1063
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1064
messages to mess up the prompt */
1065
ret = klogctl(8, NULL, 5);
1066
bool restore_loglevel = true;
1067
if(ret == -1){
1068
restore_loglevel = false;
1069
perror("klogctl");
1070
}
1071
#endif /* __linux__ */
1072
1073
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
if(sd < 0){
1075
perror("socket");
1076
exitcode = EXIT_FAILURE;
1077
#ifdef __linux__
1078
if(restore_loglevel){
1079
ret = klogctl(7, NULL, 0);
1080
if(ret == -1){
1081
perror("klogctl");
1082
}
1083
}
1084
#endif /* __linux__ */
1085
goto end;
1086
}
1087
strcpy(network.ifr_name, interface);
1088
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
if(ret == -1){
1090
perror("ioctl SIOCGIFFLAGS");
1091
#ifdef __linux__
1092
if(restore_loglevel){
1093
ret = klogctl(7, NULL, 0);
1094
if(ret == -1){
1095
perror("klogctl");
1096
}
1097
}
1098
#endif /* __linux__ */
1099
exitcode = EXIT_FAILURE;
1100
goto end;
1101
}
1102
if((network.ifr_flags & IFF_UP) == 0){
1103
network.ifr_flags |= IFF_UP;
1104
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
if(ret == -1){
1106
perror("ioctl SIOCSIFFLAGS");
1107
exitcode = EXIT_FAILURE;
1108
#ifdef __linux__
1109
if(restore_loglevel){
1110
ret = klogctl(7, NULL, 0);
1111
if(ret == -1){
1112
perror("klogctl");
761
AvahiSServiceBrowser *sb = NULL;
762
int error;
763
int ret;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
767
int sd;
768
uid_t uid;
769
gid_t gid;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
779
780
{
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
787
.group = 1 },
788
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
795
.group = 1 },
796
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
799
.group = 1 },
800
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
803
.group = 2 },
804
{ .name = "dh-bits", .key = 129,
805
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
807
.group = 2 },
808
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
811
{ .name = NULL }
812
};
813
814
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
821
debug = true;
822
break;
823
case 'c':
824
connect_to = arg;
825
break;
826
case 'i':
827
interface = arg;
828
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
843
exit(EXIT_FAILURE);
1113
844
}
845
break;
846
case 130:
847
mc.priority = arg;
848
break;
849
case ARGP_KEY_ARG:
850
argp_usage (state);
851
case ARGP_KEY_END:
852
break;
853
default:
854
return ARGP_ERR_UNKNOWN;
1114
855
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
856
return 0;
857
}
858
859
struct argp argp = { .options = options, .parser = parse_opt,
860
.args_doc = "",
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
867
goto end;
868
}
869
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
894
/* If the interface is down, bring it up */
895
{
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
if(sd < 0) {
898
perror("socket");
899
exitcode = EXIT_FAILURE;
900
goto end;
901
}
902
strcpy(network.ifr_name, interface);
1121
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
904
if(ret == -1){
1123
905
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1125
break;
1126
}
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1131
}
1132
}
1133
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(ret == -1){
1135
perror("close");
1136
}
1137
#ifdef __linux__
1138
if(restore_loglevel){
1139
/* Restores kernel loglevel to default */
1140
ret = klogctl(7, NULL, 0);
1141
if(ret == -1){
1142
perror("klogctl");
1143
}
1144
}
1145
#endif /* __linux__ */
1146
}
1147
1148
uid = getuid();
1149
gid = getgid();
1150
1151
errno = 0;
1152
setgid(gid);
1153
if(ret == -1){
1154
perror("setgid");
1155
}
1156
1157
ret = setuid(uid);
1158
if(ret == -1){
1159
perror("setuid");
1160
}
1161
1162
ret = init_gnutls_global(pubkey, seckey);
1163
if(ret == -1){
1164
fprintf(stderr, "init_gnutls_global failed\n");
1165
exitcode = EXIT_FAILURE;
1166
goto end;
1167
} else {
1168
gnutls_initialized = true;
1169
}
1170
1171
if(mkdtemp(tempdir) == NULL){
1172
perror("mkdtemp");
1173
goto end;
1174
}
1175
tempdir_created = true;
1176
1177
if(not init_gpgme(pubkey, seckey, tempdir)){
1178
fprintf(stderr, "init_gpgme failed\n");
1179
exitcode = EXIT_FAILURE;
1180
goto end;
1181
} else {
1182
gpgme_initialized = true;
1183
}
1184
1185
if(interface[0] != '\0'){
906
exitcode = EXIT_FAILURE;
907
goto end;
908
}
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
if(ret == -1){
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
915
goto end;
916
}
917
}
918
close(sd);
919
}
920
921
uid = getuid();
922
gid = getgid();
923
924
ret = setuid(uid);
925
if (ret == -1){
926
perror("setuid");
927
}
928
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
932
}
933
1186
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
935
if(if_index == 0){
1188
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1189
exitcode = EXIT_FAILURE;
1190
goto end;
1191
}
1192
}
1193
1194
if(connect_to != NULL){
1195
/* Connect directly, do not use Zeroconf */
1196
/* (Mainly meant for debugging) */
1197
char *address = strrchr(connect_to, ':');
1198
if(address == NULL){
1199
fprintf(stderr, "No colon in address\n");
1200
exitcode = EXIT_FAILURE;
1201
goto end;
1202
}
1203
uint16_t port;
1204
errno = 0;
1205
tmpmax = strtoimax(address+1, &tmp, 10);
1206
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1207
or tmpmax != (uint16_t)tmpmax){
1208
fprintf(stderr, "Bad port number\n");
1209
exitcode = EXIT_FAILURE;
1210
goto end;
1211
}
1212
port = (uint16_t)tmpmax;
1213
*address = '\0';
1214
address = connect_to;
1215
/* Colon in address indicates IPv6 */
1216
int af;
1217
if(strchr(address, ':') != NULL){
1218
af = AF_INET6;
1219
} else {
1220
af = AF_INET;
1221
}
1222
ret = start_mandos_communication(address, port, if_index, af);
1223
if(ret < 0){
1224
exitcode = EXIT_FAILURE;
1225
} else {
1226
exitcode = EXIT_SUCCESS;
1227
}
1228
goto end;
1229
}
1230
1231
{
1232
AvahiServerConfig config;
1233
/* Do not publish any local Zeroconf records */
1234
avahi_server_config_init(&config);
1235
config.publish_hinfo = 0;
1236
config.publish_addresses = 0;
1237
config.publish_workstation = 0;
1238
config.publish_domain = 0;
1239
1240
/* Allocate a new server */
1241
mc.server = avahi_server_new(avahi_simple_poll_get
1242
(mc.simple_poll), &config, NULL,
1243
NULL, &error);
1244
1245
/* Free the Avahi configuration data */
1246
avahi_server_config_free(&config);
1247
}
1248
1249
/* Check if creating the Avahi server object succeeded */
1250
if(mc.server == NULL){
1251
fprintf(stderr, "Failed to create Avahi server: %s\n",
1252
avahi_strerror(error));
1253
exitcode = EXIT_FAILURE;
1254
goto end;
1255
}
1256
1257
/* Create the Avahi service browser */
1258
sb = avahi_s_service_browser_new(mc.server, if_index,
1259
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1260
NULL, 0, browse_callback, NULL);
1261
if(sb == NULL){
1262
fprintf(stderr, "Failed to create service browser: %s\n",
1263
avahi_strerror(avahi_server_errno(mc.server)));
1264
exitcode = EXIT_FAILURE;
1265
goto end;
1266
}
1267
1268
/* Run the main loop */
1269
1270
if(debug){
1271
fprintf(stderr, "Starting Avahi loop search\n");
1272
}
1273
1274
avahi_simple_poll_loop(mc.simple_poll);
1275
937
exit(EXIT_FAILURE);
938
}
939
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
944
if(address == NULL){
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
947
goto end;
948
}
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
954
goto end;
955
}
956
*address = '\0';
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
959
if(ret < 0){
960
exitcode = EXIT_FAILURE;
961
} else {
962
exitcode = EXIT_SUCCESS;
963
}
964
goto end;
965
}
966
967
if (not debug){
968
avahi_set_log_function(empty_log);
969
}
970
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
973
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
978
" object.\n");
979
exitcode = EXIT_FAILURE;
980
goto end;
981
}
982
983
{
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
991
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
995
NULL, &error);
996
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
999
}
1000
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1006
goto end;
1007
}
1008
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
AVAHI_PROTO_INET6,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1014
if (sb == NULL) {
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1018
goto end;
1019
}
1020
1021
/* Run the main loop */
1022
1023
if (debug){
1024
fprintf(stderr, "Starting Avahi loop search\n");
1025
}
1026
1027
avahi_simple_poll_loop(mc.simple_poll);
1028
1276
1029
end:
1277
1278
if(debug){
1279
fprintf(stderr, "%s exiting\n", argv[0]);
1280
}
1281
1282
/* Cleanup things */
1283
if(sb != NULL)
1284
avahi_s_service_browser_free(sb);
1285
1286
if(mc.server != NULL)
1287
avahi_server_free(mc.server);
1288
1289
if(mc.simple_poll != NULL)
1290
avahi_simple_poll_free(mc.simple_poll);
1291
1292
if(gnutls_initialized){
1293
gnutls_certificate_free_credentials(mc.cred);
1294
gnutls_global_deinit();
1295
gnutls_dh_params_deinit(mc.dh_params);
1296
}
1297
1298
if(gpgme_initialized){
1299
gpgme_release(mc.ctx);
1300
}
1301
1302
/* Removes the temp directory used by GPGME */
1303
if(tempdir_created){
1304
DIR *d;
1305
struct dirent *direntry;
1306
d = opendir(tempdir);
1307
if(d == NULL){
1308
if(errno != ENOENT){
1309
perror("opendir");
1310
}
1311
} else {
1312
while(true){
1313
direntry = readdir(d);
1314
if(direntry == NULL){
1315
break;
1316
}
1317
/* Skip "." and ".." */
1318
if(direntry->d_name[0] == '.'
1319
and (direntry->d_name[1] == '\0'
1320
or (direntry->d_name[1] == '.'
1321
and direntry->d_name[2] == '\0'))){
1322
continue;
1323
}
1324
char *fullname = NULL;
1325
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
direntry->d_name);
1327
if(ret < 0){
1328
perror("asprintf");
1329
continue;
1330
}
1331
ret = remove(fullname);
1332
if(ret == -1){
1333
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1334
strerror(errno));
1335
}
1336
free(fullname);
1337
}
1338
closedir(d);
1339
}
1340
ret = rmdir(tempdir);
1341
if(ret == -1 and errno != ENOENT){
1342
perror("rmdir");
1343
}
1344
}
1345
1346
return exitcode;
1030
1031
if (debug){
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1033
}
1034
1035
/* Cleanup things */
1036
if (sb != NULL)
1037
avahi_s_service_browser_free(sb);
1038
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1050
}
1051
1052
return exitcode;
1347
1053
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0