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24.1.41
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: plugins.d/password-request.c
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- Committer: Björn Påhlsson
- Date: 2008-08-10 19:14:12 UTC
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 63.
- Revision ID: belorn@braxen-20080810191412-0c8xxvnh5nalhdfq
updated mandos-client sections and added see also stuff
- files added:
- network-protocol.txt
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => mandos-client.c
- plugin-runner.xml => mandos-client.xml
- plugins.d/mandos-client.c => plugins.d/password-request.c
- plugins.d/mandos-client.xml => plugins.d/password-request.xml
- files modified:
- Makefile
added
removed
plugins.d/password-request.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos-client - get and decrypt data from a Mandos server
3
* Mandos client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
14
13
*
15
14
* This program is free software: you can redistribute it and/or
16
15
* modify it under the terms of the GNU General Public License as
33
32
#define _LARGEFILE_SOURCE
34
33
#define _FILE_OFFSET_BITS 64
35
34
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
36
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
41
39
#include <stdint.h> /* uint16_t, uint32_t */
42
40
#include <stddef.h> /* NULL, size_t, ssize_t */
43
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
42
srand() */
45
#include <stdbool.h> /* bool, false, true */
43
#include <stdbool.h> /* bool, true */
46
44
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
48
IFF_UP */
49
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t */
53
#include <inttypes.h> /* PRIu16 */
54
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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
struct in6_addr, inet_pton(),
56
connect() */
60
57
#include <assert.h> /* assert() */
61
58
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
59
#include <time.h> /* time() */
63
60
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
61
SIOCSIFFLAGS, if_indextoname(),
65
62
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
63
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
64
getuid(), getgid(), setuid(),
71
65
setgid() */
66
#include <netinet/in.h>
72
67
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
68
#include <iso646.h> /* not, and */
74
69
#include <argp.h> /* struct argp_option, error_t, struct
75
70
argp_state, struct argp,
76
71
argp_parse(), ARGP_KEY_ARG,
77
72
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <signal.h> /* sigemptyset(), sigaddset(), sigaction(), SIGTERM, sigaction */
79
#ifdef __linux__
80
#include <sys/klog.h> /* klogctl() */
81
#endif
82
73
83
74
/* Avahi */
84
75
/* All Avahi types, constants and functions
92
83
#include <avahi-common/error.h>
93
84
94
85
/* GnuTLS */
95
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
96
functions:
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
97
87
gnutls_*
98
88
init_gnutls_session(),
99
89
GNUTLS_* */
100
#include <gnutls/openpgp.h>
101
/* gnutls_certificate_set_openpgp_key_file(),
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
102
91
GNUTLS_OPENPGP_FMT_BASE64 */
103
92
104
93
/* GPGME */
105
#include <gpgme.h> /* All GPGME types, constants and
106
functions:
94
#include <gpgme.h> /* All GPGME types, constants and functions
107
95
gpgme_*
108
96
GPGME_PROTOCOL_OpenPGP,
109
97
GPG_ERR_NO_* */
110
98
111
99
#define BUFFER_SIZE 256
112
100
113
#define PATHDIR "/conf/conf.d/mandos"
114
#define SECKEY "seckey.txt"
115
#define PUBKEY "pubkey.txt"
116
117
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
118
103
static const char mandos_protocol_version[] = "1";
119
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
120
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
121
106
122
107
/* Used for passing in values through the Avahi callback functions */
127
112
unsigned int dh_bits;
128
113
gnutls_dh_params_t dh_params;
129
114
const char *priority;
130
gpgme_ctx_t ctx;
131
115
} mandos_context;
132
116
133
/* global context so signal handler can reach it*/
134
mandos_context mc;
135
136
117
/*
137
* Make additional room in "buffer" for at least BUFFER_SIZE
138
* additional bytes. "buffer_capacity" is how much is currently
139
* allocated, "buffer_length" is how much is already used.
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.
140
121
*/
141
size_t incbuffer(char **buffer, size_t buffer_length,
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
142
123
size_t buffer_capacity){
143
if(buffer_length + BUFFER_SIZE > buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
144
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
if(buffer == NULL){
126
if (buffer == NULL){
146
127
return 0;
147
128
}
148
129
buffer_capacity += BUFFER_SIZE;
151
132
}
152
133
153
134
/*
154
* Initialize GPGME.
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
155
137
*/
156
static bool init_gpgme(const char *seckey,
157
const char *pubkey, const char *tempdir){
158
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;
159
144
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
160
148
gpgme_engine_info_t engine_info;
161
149
162
163
/*
164
* Helper function to insert pub and seckey to the engine keyring.
165
*/
166
bool import_key(const char *filename){
167
int fd;
168
gpgme_data_t pgp_data;
169
170
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
171
if(fd == -1){
172
perror("open");
173
return false;
174
}
175
176
rc = gpgme_data_new_from_fd(&pgp_data, fd);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
return false;
181
}
182
183
rc = gpgme_op_import(mc.ctx, pgp_data);
184
if(rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
187
return false;
188
}
189
190
ret = (int)TEMP_FAILURE_RETRY(close(fd));
191
if(ret == -1){
192
perror("close");
193
}
194
gpgme_data_release(pgp_data);
195
return true;
196
}
197
198
if(debug){
199
fprintf(stderr, "Initialize gpgme\n");
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
200
152
}
201
153
202
154
/* Init GPGME */
203
155
gpgme_check_version(NULL);
204
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
205
if(rc != GPG_ERR_NO_ERROR){
157
if (rc != GPG_ERR_NO_ERROR){
206
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
207
159
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
160
return -1;
209
161
}
210
162
211
/* Set GPGME home directory for the OpenPGP engine only */
212
rc = gpgme_get_engine_info(&engine_info);
213
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){
214
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
215
167
gpgme_strsource(rc), gpgme_strerror(rc));
216
return false;
168
return -1;
217
169
}
218
170
while(engine_info != NULL){
219
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
220
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
221
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
222
174
break;
223
175
}
224
176
engine_info = engine_info->next;
225
177
}
226
178
if(engine_info == NULL){
227
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
228
return false;
229
}
230
231
/* Create new GPGME "context" */
232
rc = gpgme_new(&(mc.ctx));
233
if(rc != GPG_ERR_NO_ERROR){
234
fprintf(stderr, "bad gpgme_new: %s: %s\n",
235
gpgme_strsource(rc), gpgme_strerror(rc));
236
return false;
237
}
238
239
if(not import_key(pubkey) or not import_key(seckey)){
240
return false;
241
}
242
243
return true;
244
}
245
246
/*
247
* Decrypt OpenPGP data.
248
* Returns -1 on error
249
*/
250
static ssize_t pgp_packet_decrypt(const char *cryptotext,
251
size_t crypto_size,
252
char **plaintext){
253
gpgme_data_t dh_crypto, dh_plain;
254
gpgme_error_t rc;
255
ssize_t ret;
256
size_t plaintext_capacity = 0;
257
ssize_t plaintext_length = 0;
258
259
if(debug){
260
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
261
181
}
262
182
263
183
/* Create new GPGME data buffer from memory cryptotext */
264
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
265
185
0);
266
if(rc != GPG_ERR_NO_ERROR){
186
if (rc != GPG_ERR_NO_ERROR){
267
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
268
188
gpgme_strsource(rc), gpgme_strerror(rc));
269
189
return -1;
271
191
272
192
/* Create new empty GPGME data buffer for the plaintext */
273
193
rc = gpgme_data_new(&dh_plain);
274
if(rc != GPG_ERR_NO_ERROR){
194
if (rc != GPG_ERR_NO_ERROR){
275
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
276
196
gpgme_strsource(rc), gpgme_strerror(rc));
277
197
gpgme_data_release(dh_crypto);
278
198
return -1;
279
199
}
280
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
281
210
/* Decrypt data from the cryptotext data buffer to the plaintext
282
211
data buffer */
283
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
284
if(rc != GPG_ERR_NO_ERROR){
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
285
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
286
215
gpgme_strsource(rc), gpgme_strerror(rc));
287
216
plaintext_length = -1;
288
if(debug){
289
gpgme_decrypt_result_t result;
290
result = gpgme_op_decrypt_result(mc.ctx);
291
if(result == NULL){
292
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
293
} else {
294
fprintf(stderr, "Unsupported algorithm: %s\n",
295
result->unsupported_algorithm);
296
fprintf(stderr, "Wrong key usage: %u\n",
297
result->wrong_key_usage);
298
if(result->file_name != NULL){
299
fprintf(stderr, "File name: %s\n", result->file_name);
300
}
301
gpgme_recipient_t recipient;
302
recipient = result->recipients;
303
if(recipient){
304
while(recipient != NULL){
305
fprintf(stderr, "Public key algorithm: %s\n",
306
gpgme_pubkey_algo_name(recipient->pubkey_algo));
307
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
308
fprintf(stderr, "Secret key available: %s\n",
309
recipient->status == GPG_ERR_NO_SECKEY
310
? "No" : "Yes");
311
recipient = recipient->next;
312
}
313
}
314
}
315
}
316
217
goto decrypt_end;
317
218
}
318
219
320
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
321
222
}
322
223
224
if (debug){
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
227
if (result == NULL){
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
} else {
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
236
}
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
239
if(recipient){
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
323
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
324
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
325
perror("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
326
256
plaintext_length = -1;
327
257
goto decrypt_end;
328
258
}
329
259
330
260
*plaintext = NULL;
331
261
while(true){
332
plaintext_capacity = incbuffer(plaintext,
262
plaintext_capacity = adjustbuffer(plaintext,
333
263
(size_t)plaintext_length,
334
264
plaintext_capacity);
335
if(plaintext_capacity == 0){
336
perror("incbuffer");
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
337
267
plaintext_length = -1;
338
268
goto decrypt_end;
339
269
}
341
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
342
272
BUFFER_SIZE);
343
273
/* Print the data, if any */
344
if(ret == 0){
274
if (ret == 0){
345
275
/* EOF */
346
276
break;
347
277
}
352
282
}
353
283
plaintext_length += ret;
354
284
}
355
285
356
286
if(debug){
357
287
fprintf(stderr, "Decrypted password is: ");
358
288
for(ssize_t i = 0; i < plaintext_length; i++){
371
301
return plaintext_length;
372
302
}
373
303
374
static const char * safer_gnutls_strerror(int value){
375
const char *ret = gnutls_strerror(value); /* Spurious warning from
376
-Wunreachable-code */
377
if(ret == NULL)
304
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value);
306
if (ret == NULL)
378
307
ret = "(unknown)";
379
308
return ret;
380
309
}
385
314
fprintf(stderr, "GnuTLS: %s", string);
386
315
}
387
316
388
static int init_gnutls_global(const char *pubkeyfilename,
389
const char *seckeyfilename){
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfile,
319
const char *seckeyfile){
390
320
int ret;
391
321
392
322
if(debug){
394
324
}
395
325
396
326
ret = gnutls_global_init();
397
if(ret != GNUTLS_E_SUCCESS){
398
fprintf(stderr, "GnuTLS global_init: %s\n",
399
safer_gnutls_strerror(ret));
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
400
330
return -1;
401
331
}
402
332
403
if(debug){
333
if (debug){
404
334
/* "Use a log level over 10 to enable all debugging options."
405
335
* - GnuTLS manual
406
336
*/
409
339
}
410
340
411
341
/* OpenPGP credentials */
412
gnutls_certificate_allocate_credentials(&mc.cred);
413
if(ret != GNUTLS_E_SUCCESS){
414
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
415
from
416
-Wunreachable-code
417
*/
418
safer_gnutls_strerror(ret));
419
gnutls_global_deinit();
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
420
347
return -1;
421
348
}
422
349
423
350
if(debug){
424
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
425
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
426
seckeyfilename);
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
353
seckeyfile);
427
354
}
428
355
429
356
ret = gnutls_certificate_set_openpgp_key_file
430
(mc.cred, pubkeyfilename, seckeyfilename,
431
GNUTLS_OPENPGP_FMT_BASE64);
432
if(ret != GNUTLS_E_SUCCESS){
357
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
358
if (ret != GNUTLS_E_SUCCESS) {
433
359
fprintf(stderr,
434
360
"Error[%d] while reading the OpenPGP key pair ('%s',"
435
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
436
fprintf(stderr, "The GnuTLS error is: %s\n",
361
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
fprintf(stdout, "The GnuTLS error is: %s\n",
437
363
safer_gnutls_strerror(ret));
438
364
goto globalfail;
439
365
}
440
366
441
367
/* GnuTLS server initialization */
442
ret = gnutls_dh_params_init(&mc.dh_params);
443
if(ret != GNUTLS_E_SUCCESS){
444
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
445
" %s\n", safer_gnutls_strerror(ret));
446
goto globalfail;
447
}
448
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
449
if(ret != GNUTLS_E_SUCCESS){
450
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
451
safer_gnutls_strerror(ret));
452
goto globalfail;
453
}
454
455
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
456
368
ret = gnutls_dh_params_init(&mc->dh_params);
369
if (ret != GNUTLS_E_SUCCESS) {
370
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
" %s\n", safer_gnutls_strerror(ret));
372
goto globalfail;
373
}
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
375
if (ret != GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
safer_gnutls_strerror(ret));
378
goto globalfail;
379
}
380
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
382
457
383
return 0;
458
384
459
385
globalfail:
460
461
gnutls_certificate_free_credentials(mc.cred);
386
387
gnutls_certificate_free_credentials(mc->cred);
462
388
gnutls_global_deinit();
463
gnutls_dh_params_deinit(mc.dh_params);
464
389
return -1;
390
465
391
}
466
392
467
static int init_gnutls_session(gnutls_session_t *session){
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
468
395
int ret;
469
396
/* GnuTLS session creation */
470
397
ret = gnutls_init(session, GNUTLS_SERVER);
471
if(ret != GNUTLS_E_SUCCESS){
398
if (ret != GNUTLS_E_SUCCESS){
472
399
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
400
safer_gnutls_strerror(ret));
474
401
}
475
402
476
403
{
477
404
const char *err;
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
479
if(ret != GNUTLS_E_SUCCESS){
405
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
406
if (ret != GNUTLS_E_SUCCESS) {
480
407
fprintf(stderr, "Syntax error at: %s\n", err);
481
408
fprintf(stderr, "GnuTLS error: %s\n",
482
409
safer_gnutls_strerror(ret));
483
gnutls_deinit(*session);
410
gnutls_deinit (*session);
484
411
return -1;
485
412
}
486
413
}
487
414
488
415
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
mc.cred);
490
if(ret != GNUTLS_E_SUCCESS){
416
mc->cred);
417
if (ret != GNUTLS_E_SUCCESS) {
491
418
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
419
safer_gnutls_strerror(ret));
493
gnutls_deinit(*session);
420
gnutls_deinit (*session);
494
421
return -1;
495
422
}
496
423
497
424
/* ignore client certificate if any. */
498
gnutls_certificate_server_set_request(*session,
499
GNUTLS_CERT_IGNORE);
425
gnutls_certificate_server_set_request (*session,
426
GNUTLS_CERT_IGNORE);
500
427
501
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
428
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
502
429
503
430
return 0;
504
431
}
510
437
/* Called when a Mandos server is found */
511
438
static int start_mandos_communication(const char *ip, uint16_t port,
512
439
AvahiIfIndex if_index,
513
int af){
440
mandos_context *mc){
514
441
int ret, tcp_sd;
515
ssize_t sret;
516
union {
517
struct sockaddr_in in;
518
struct sockaddr_in6 in6;
519
} to;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
520
443
char *buffer = NULL;
521
444
char *decrypted_buffer;
522
445
size_t buffer_length = 0;
524
447
ssize_t decrypted_buffer_size;
525
448
size_t written;
526
449
int retval = 0;
450
char interface[IF_NAMESIZE];
527
451
gnutls_session_t session;
528
int pf; /* Protocol family */
529
530
switch(af){
531
case AF_INET6:
532
pf = PF_INET6;
533
break;
534
case AF_INET:
535
pf = PF_INET;
536
break;
537
default:
538
fprintf(stderr, "Bad address family: %d\n", af);
539
return -1;
540
}
541
542
ret = init_gnutls_session(&session);
543
if(ret != 0){
452
453
ret = init_gnutls_session (mc, &session);
454
if (ret != 0){
544
455
return -1;
545
456
}
546
457
547
458
if(debug){
548
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
549
460
"\n", ip, port);
550
461
}
551
462
552
tcp_sd = socket(pf, SOCK_STREAM, 0);
553
if(tcp_sd < 0){
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
464
if(tcp_sd < 0) {
554
465
perror("socket");
555
466
return -1;
556
467
}
468
469
if(debug){
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
472
return -1;
473
}
474
fprintf(stderr, "Binding to interface %s\n", interface);
475
}
557
476
558
memset(&to, 0, sizeof(to));
559
if(af == AF_INET6){
560
to.in6.sin6_family = (uint16_t)af;
561
ret = inet_pton(af, ip, &to.in6.sin6_addr);
562
} else { /* IPv4 */
563
to.in.sin_family = (sa_family_t)af;
564
ret = inet_pton(af, ip, &to.in.sin_addr);
565
}
566
if(ret < 0 ){
477
memset(&to,0,sizeof(to)); /* Spurious warning */
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
482
if (ret < 0 ){
567
483
perror("inet_pton");
568
484
return -1;
569
485
}
571
487
fprintf(stderr, "Bad address: %s\n", ip);
572
488
return -1;
573
489
}
574
if(af == AF_INET6){
575
to.in6.sin6_port = htons(port); /* Spurious warnings from
576
-Wconversion and
577
-Wunreachable-code */
578
579
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
580
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
581
-Wunreachable-code*/
582
if(if_index == AVAHI_IF_UNSPEC){
583
fprintf(stderr, "An IPv6 link-local address is incomplete"
584
" without a network interface\n");
585
return -1;
586
}
587
/* Set the network interface number as scope */
588
to.in6.sin6_scope_id = (uint32_t)if_index;
589
}
590
} else {
591
to.in.sin_port = htons(port); /* Spurious warnings from
592
-Wconversion and
593
-Wunreachable-code */
594
}
490
to.in6.sin6_port = htons(port); /* Spurious warning */
491
492
to.in6.sin6_scope_id = (uint32_t)if_index;
595
493
596
494
if(debug){
597
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
598
char interface[IF_NAMESIZE];
599
if(if_indextoname((unsigned int)if_index, interface) == NULL){
600
perror("if_indextoname");
601
} else {
602
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
603
ip, interface, port);
604
}
605
} else {
606
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
607
port);
608
}
609
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
610
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
611
const char *pcret;
612
if(af == AF_INET6){
613
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
614
sizeof(addrstr));
615
} else {
616
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
617
sizeof(addrstr));
618
}
619
if(pcret == NULL){
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
496
port);
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
620
500
perror("inet_ntop");
621
501
} else {
622
502
if(strcmp(addrstr, ip) != 0){
625
505
}
626
506
}
627
507
628
if(af == AF_INET6){
629
ret = connect(tcp_sd, &to.in6, sizeof(to));
630
} else {
631
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
632
}
633
if(ret < 0){
508
ret = connect(tcp_sd, &to.in, sizeof(to));
509
if (ret < 0){
634
510
perror("connect");
635
511
return -1;
636
512
}
637
513
638
514
const char *out = mandos_protocol_version;
639
515
written = 0;
640
while(true){
516
while (true){
641
517
size_t out_size = strlen(out);
642
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
643
519
out_size - written));
644
if(ret == -1){
520
if (ret == -1){
645
521
perror("write");
646
522
retval = -1;
647
523
goto mandos_end;
650
526
if(written < out_size){
651
527
continue;
652
528
} else {
653
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
654
530
written = 0;
655
531
out = "\r\n";
656
532
} else {
658
534
}
659
535
}
660
536
}
661
537
662
538
if(debug){
663
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
664
540
}
665
541
666
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
667
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
668
544
do{
669
ret = gnutls_handshake(session);
545
ret = gnutls_handshake (session);
670
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
671
547
672
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
673
549
if(debug){
674
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
675
gnutls_perror(ret);
551
gnutls_perror (ret);
676
552
}
677
553
retval = -1;
678
554
goto mandos_end;
681
557
/* Read OpenPGP packet that contains the wanted password */
682
558
683
559
if(debug){
684
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
685
561
ip);
686
562
}
687
563
688
564
while(true){
689
buffer_capacity = incbuffer(&buffer, buffer_length,
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
690
566
buffer_capacity);
691
if(buffer_capacity == 0){
692
perror("incbuffer");
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
693
569
retval = -1;
694
570
goto mandos_end;
695
571
}
696
572
697
sret = gnutls_record_recv(session, buffer+buffer_length,
698
BUFFER_SIZE);
699
if(sret == 0){
573
ret = gnutls_record_recv(session, buffer+buffer_length,
574
BUFFER_SIZE);
575
if (ret == 0){
700
576
break;
701
577
}
702
if(sret < 0){
703
switch(sret){
578
if (ret < 0){
579
switch(ret){
704
580
case GNUTLS_E_INTERRUPTED:
705
581
case GNUTLS_E_AGAIN:
706
582
break;
707
583
case GNUTLS_E_REHANDSHAKE:
708
584
do{
709
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
710
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
711
if(ret < 0){
587
if (ret < 0){
712
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
713
gnutls_perror(ret);
589
gnutls_perror (ret);
714
590
retval = -1;
715
591
goto mandos_end;
716
592
}
719
595
fprintf(stderr, "Unknown error while reading data from"
720
596
" encrypted session with Mandos server\n");
721
597
retval = -1;
722
gnutls_bye(session, GNUTLS_SHUT_RDWR);
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
723
599
goto mandos_end;
724
600
}
725
601
} else {
726
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
727
603
}
728
604
}
729
605
731
607
fprintf(stderr, "Closing TLS session\n");
732
608
}
733
609
734
gnutls_bye(session, GNUTLS_SHUT_RDWR);
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
735
611
736
if(buffer_length > 0){
612
if (buffer_length > 0){
737
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
738
614
buffer_length,
739
&decrypted_buffer);
740
if(decrypted_buffer_size >= 0){
615
&decrypted_buffer,
616
keydir);
617
if (decrypted_buffer_size >= 0){
741
618
written = 0;
742
619
while(written < (size_t) decrypted_buffer_size){
743
ret = (int)fwrite(decrypted_buffer + written, 1,
744
(size_t)decrypted_buffer_size - written,
745
stdout);
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
622
stdout);
746
623
if(ret == 0 and ferror(stdout)){
747
624
if(debug){
748
625
fprintf(stderr, "Error writing encrypted data: %s\n",
757
634
} else {
758
635
retval = -1;
759
636
}
760
} else {
761
retval = -1;
762
637
}
763
638
764
639
/* Shutdown procedure */
765
640
766
641
mandos_end:
767
642
free(buffer);
768
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
769
if(ret == -1){
770
perror("close");
771
}
772
gnutls_deinit(session);
643
close(tcp_sd);
644
gnutls_deinit (session);
773
645
return retval;
774
646
}
775
647
776
648
static void resolve_callback(AvahiSServiceResolver *r,
777
649
AvahiIfIndex interface,
778
AvahiProtocol proto,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
779
651
AvahiResolverEvent event,
780
652
const char *name,
781
653
const char *type,
786
658
AVAHI_GCC_UNUSED AvahiStringList *txt,
787
659
AVAHI_GCC_UNUSED AvahiLookupResultFlags
788
660
flags,
789
__attribute__((unused)) void* userdata){
790
assert(r);
661
void* userdata) {
662
mandos_context *mc = userdata;
663
assert(r); /* Spurious warning */
791
664
792
665
/* Called whenever a service has been resolved successfully or
793
666
timed out */
794
667
795
switch(event){
668
switch (event) {
796
669
default:
797
670
case AVAHI_RESOLVER_FAILURE:
798
671
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
672
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc.server)));
673
avahi_strerror(avahi_server_errno(mc->server)));
801
674
break;
802
675
803
676
case AVAHI_RESOLVER_FOUND:
806
679
avahi_address_snprint(ip, sizeof(ip), address);
807
680
if(debug){
808
681
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
682
PRIu16 ") on port %d\n", name, host_name, ip,
683
interface, port);
811
684
}
812
int ret = start_mandos_communication(ip, port, interface,
813
avahi_proto_to_af(proto));
814
if(ret == 0){
815
avahi_simple_poll_quit(mc.simple_poll);
685
int ret = start_mandos_communication(ip, port, interface, mc);
686
if (ret == 0){
687
exit(EXIT_SUCCESS);
816
688
}
817
689
}
818
690
}
819
691
avahi_s_service_resolver_free(r);
820
692
}
821
693
822
static void browse_callback(AvahiSServiceBrowser *b,
823
AvahiIfIndex interface,
824
AvahiProtocol protocol,
825
AvahiBrowserEvent event,
826
const char *name,
827
const char *type,
828
const char *domain,
829
AVAHI_GCC_UNUSED AvahiLookupResultFlags
830
flags,
831
__attribute__((unused)) void* userdata){
832
assert(b);
694
static void browse_callback( AvahiSServiceBrowser *b,
695
AvahiIfIndex interface,
696
AvahiProtocol protocol,
697
AvahiBrowserEvent event,
698
const char *name,
699
const char *type,
700
const char *domain,
701
AVAHI_GCC_UNUSED AvahiLookupResultFlags
702
flags,
703
void* userdata) {
704
mandos_context *mc = userdata;
705
assert(b); /* Spurious warning */
833
706
834
707
/* Called whenever a new services becomes available on the LAN or
835
708
is removed from the LAN */
836
709
837
switch(event){
710
switch (event) {
838
711
default:
839
712
case AVAHI_BROWSER_FAILURE:
840
713
841
714
fprintf(stderr, "(Avahi browser) %s\n",
842
avahi_strerror(avahi_server_errno(mc.server)));
843
avahi_simple_poll_quit(mc.simple_poll);
715
avahi_strerror(avahi_server_errno(mc->server)));
716
avahi_simple_poll_quit(mc->simple_poll);
844
717
return;
845
718
846
719
case AVAHI_BROWSER_NEW:
849
722
the callback function is called the Avahi server will free the
850
723
resolver for us. */
851
724
852
if(!(avahi_s_service_resolver_new(mc.server, interface,
725
if (!(avahi_s_service_resolver_new(mc->server, interface,
853
726
protocol, name, type, domain,
854
727
AVAHI_PROTO_INET6, 0,
855
resolve_callback, NULL)))
728
resolve_callback, mc)))
856
729
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
857
name, avahi_strerror(avahi_server_errno(mc.server)));
730
name, avahi_strerror(avahi_server_errno(mc->server)));
858
731
break;
859
732
860
733
case AVAHI_BROWSER_REMOVE:
869
742
}
870
743
}
871
744
872
static void handle_sigterm(__attribute__((unused)) int sig){
873
int old_errno = errno;
874
avahi_simple_poll_quit(mc.simple_poll);
875
errno = old_errno;
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
751
if (tmp == NULL){
752
return NULL;
753
}
754
if(f_len > 0){
755
memcpy(tmp, first, f_len); /* Spurious warning */
756
}
757
tmp[f_len] = '/';
758
if(s_len > 0){
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
760
}
761
tmp[f_len + 1 + s_len] = '\0';
762
return tmp;
876
763
}
877
764
765
878
766
int main(int argc, char *argv[]){
879
AvahiSServiceBrowser *sb = NULL;
880
int error;
881
int ret;
882
intmax_t tmpmax;
883
int numchars;
884
int exitcode = EXIT_SUCCESS;
885
const char *interface = "eth0";
886
struct ifreq network;
887
int sd;
888
uid_t uid;
889
gid_t gid;
890
char *connect_to = NULL;
891
char tempdir[] = "/tmp/mandosXXXXXX";
892
bool tempdir_created = false;
893
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
894
const char *seckey = PATHDIR "/" SECKEY;
895
const char *pubkey = PATHDIR "/" PUBKEY;
896
897
bool gnutls_initialized = false;
898
bool gpgme_initialized = false;
899
double delay = 2.5;
900
901
struct sigaction old_sigterm_action;
902
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
903
904
/* Initialize mandos context */
905
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
906
.dh_bits = 1024, .priority = "SECURE256"
907
":!CTYPE-X.509:+CTYPE-OPENPGP" };
908
909
{
910
struct argp_option options[] = {
911
{ .name = "debug", .key = 128,
912
.doc = "Debug mode", .group = 3 },
913
{ .name = "connect", .key = 'c',
914
.arg = "ADDRESS:PORT",
915
.doc = "Connect directly to a specific Mandos server",
916
.group = 1 },
917
{ .name = "interface", .key = 'i',
918
.arg = "NAME",
919
.doc = "Network interface that will be used to search for"
920
" Mandos servers",
921
.group = 1 },
922
{ .name = "seckey", .key = 's',
923
.arg = "FILE",
924
.doc = "OpenPGP secret key file base name",
925
.group = 1 },
926
{ .name = "pubkey", .key = 'p',
927
.arg = "FILE",
928
.doc = "OpenPGP public key file base name",
929
.group = 2 },
930
{ .name = "dh-bits", .key = 129,
931
.arg = "BITS",
932
.doc = "Bit length of the prime number used in the"
933
" Diffie-Hellman key exchange",
934
.group = 2 },
935
{ .name = "priority", .key = 130,
936
.arg = "STRING",
937
.doc = "GnuTLS priority string for the TLS handshake",
938
.group = 1 },
939
{ .name = "delay", .key = 131,
940
.arg = "SECONDS",
941
.doc = "Maximum delay to wait for interface startup",
942
.group = 2 },
943
{ .name = NULL }
944
};
945
946
error_t parse_opt(int key, char *arg,
947
struct argp_state *state){
948
switch(key){
949
case 128: /* --debug */
950
debug = true;
951
break;
952
case 'c': /* --connect */
953
connect_to = arg;
954
break;
955
case 'i': /* --interface */
956
interface = arg;
957
break;
958
case 's': /* --seckey */
959
seckey = arg;
960
break;
961
case 'p': /* --pubkey */
962
pubkey = arg;
963
break;
964
case 129: /* --dh-bits */
965
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
966
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
967
or arg[numchars] != '\0'){
968
fprintf(stderr, "Bad number of DH bits\n");
969
exit(EXIT_FAILURE);
970
}
971
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
972
break;
973
case 130: /* --priority */
974
mc.priority = arg;
975
break;
976
case 131: /* --delay */
977
ret = sscanf(arg, "%lf%n", &delay, &numchars);
978
if(ret < 1 or arg[numchars] != '\0'){
979
fprintf(stderr, "Bad delay\n");
980
exit(EXIT_FAILURE);
981
}
982
break;
983
case ARGP_KEY_ARG:
984
argp_usage(state);
985
case ARGP_KEY_END:
986
break;
987
default:
988
return ARGP_ERR_UNKNOWN;
989
}
990
return 0;
991
}
992
993
struct argp argp = { .options = options, .parser = parse_opt,
994
.args_doc = "",
995
.doc = "Mandos client -- Get and decrypt"
996
" passwords from a Mandos server" };
997
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
998
if(ret == ARGP_ERR_UNKNOWN){
999
fprintf(stderr, "Unknown error while parsing arguments\n");
1000
exitcode = EXIT_FAILURE;
1001
goto end;
1002
}
1003
}
1004
1005
/* If the interface is down, bring it up */
1006
if(interface[0] != '\0'){
1007
#ifdef __linux__
1008
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1009
messages to mess up the prompt */
1010
ret = klogctl(8, NULL, 5);
1011
bool restore_loglevel = true;
1012
if(ret == -1){
1013
restore_loglevel = false;
1014
perror("klogctl");
1015
}
1016
#endif
1017
1018
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1019
if(sd < 0){
1020
perror("socket");
1021
exitcode = EXIT_FAILURE;
1022
#ifdef __linux__
1023
if(restore_loglevel){
1024
ret = klogctl(7, NULL, 0);
1025
if(ret == -1){
1026
perror("klogctl");
1027
}
1028
}
1029
#endif
1030
goto end;
1031
}
1032
strcpy(network.ifr_name, interface);
1033
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1034
if(ret == -1){
1035
perror("ioctl SIOCGIFFLAGS");
1036
#ifdef __linux__
1037
if(restore_loglevel){
1038
ret = klogctl(7, NULL, 0);
1039
if(ret == -1){
1040
perror("klogctl");
1041
}
1042
}
1043
#endif
1044
exitcode = EXIT_FAILURE;
1045
goto end;
1046
}
1047
if((network.ifr_flags & IFF_UP) == 0){
1048
network.ifr_flags |= IFF_UP;
1049
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1050
if(ret == -1){
1051
perror("ioctl SIOCSIFFLAGS");
767
AvahiSServiceBrowser *sb = NULL;
768
int error;
769
int ret;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
773
int sd;
774
uid_t uid;
775
gid_t gid;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
783
784
{
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
789
.arg = "IP",
790
.doc = "Connect directly to a sepcified mandos server",
791
.group = 1 },
792
{ .name = "interface", .key = 'i',
793
.arg = "INTERFACE",
794
.doc = "Interface that Avahi will conntect through",
795
.group = 1 },
796
{ .name = "keydir", .key = 'd',
797
.arg = "KEYDIR",
798
.doc = "Directory where the openpgp keyring is",
799
.group = 1 },
800
{ .name = "seckey", .key = 's',
801
.arg = "SECKEY",
802
.doc = "Secret openpgp key for gnutls authentication",
803
.group = 1 },
804
{ .name = "pubkey", .key = 'p',
805
.arg = "PUBKEY",
806
.doc = "Public openpgp key for gnutls authentication",
807
.group = 2 },
808
{ .name = "dh-bits", .key = 129,
809
.arg = "BITS",
810
.doc = "dh-bits to use in gnutls communication",
811
.group = 2 },
812
{ .name = "priority", .key = 130,
813
.arg = "PRIORITY",
814
.doc = "GNUTLS priority", .group = 1 },
815
{ .name = NULL }
816
};
817
818
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
823
switch (key) {
824
case 128:
825
debug = true;
826
break;
827
case 'c':
828
connect_to = arg;
829
break;
830
case 'i':
831
interface = arg;
832
break;
833
case 'd':
834
keydir = arg;
835
break;
836
case 's':
837
seckeyfile = arg;
838
break;
839
case 'p':
840
pubkeyfile = arg;
841
break;
842
case 129:
843
errno = 0;
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
845
if (errno){
846
perror("strtol");
847
exit(EXIT_FAILURE);
848
}
849
break;
850
case 130:
851
mc.priority = arg;
852
break;
853
case ARGP_KEY_ARG:
854
argp_usage (state);
855
break;
856
case ARGP_KEY_END:
857
break;
858
default:
859
return ARGP_ERR_UNKNOWN;
860
}
861
return 0;
862
}
863
864
struct argp argp = { .options = options, .parser = parse_opt,
865
.args_doc = "",
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
1052
871
exitcode = EXIT_FAILURE;
1053
#ifdef __linux__
1054
if(restore_loglevel){
1055
ret = klogctl(7, NULL, 0);
1056
if(ret == -1){
1057
perror("klogctl");
1058
}
1059
}
1060
#endif
1061
872
goto end;
1062
873
}
1063
874
}
1064
/* sleep checking until interface is running */
1065
for(int i=0; i < delay * 4; i++){
1066
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1067
if(ret == -1){
1068
perror("ioctl SIOCGIFFLAGS");
1069
} else if(network.ifr_flags & IFF_RUNNING){
1070
break;
1071
}
1072
struct timespec sleeptime = { .tv_nsec = 250000000 };
1073
ret = nanosleep(&sleeptime, NULL);
1074
if(ret == -1 and errno != EINTR){
1075
perror("nanosleep");
1076
}
1077
}
1078
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1079
if(ret == -1){
1080
perror("close");
1081
}
1082
#ifdef __linux__
1083
if(restore_loglevel){
1084
/* Restores kernel loglevel to default */
1085
ret = klogctl(7, NULL, 0);
1086
if(ret == -1){
1087
perror("klogctl");
1088
}
1089
}
1090
#endif
1091
}
1092
1093
uid = getuid();
1094
gid = getgid();
1095
1096
errno = 0;
1097
setgid(gid);
1098
if(ret == -1){
1099
perror("setgid");
1100
}
1101
1102
ret = setuid(uid);
1103
if(ret == -1){
1104
perror("setuid");
1105
}
1106
1107
ret = init_gnutls_global(pubkey, seckey);
1108
if(ret == -1){
1109
fprintf(stderr, "init_gnutls_global failed\n");
1110
exitcode = EXIT_FAILURE;
1111
goto end;
1112
} else {
1113
gnutls_initialized = true;
1114
}
1115
1116
if(mkdtemp(tempdir) == NULL){
1117
perror("mkdtemp");
1118
goto end;
1119
}
1120
tempdir_created = true;
1121
1122
if(not init_gpgme(pubkey, seckey, tempdir)){
1123
fprintf(stderr, "init_gpgme failed\n");
1124
exitcode = EXIT_FAILURE;
1125
goto end;
1126
} else {
1127
gpgme_initialized = true;
1128
}
1129
1130
if(interface[0] != '\0'){
875
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
880
goto end;
881
}
882
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
886
goto end;
887
}
888
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
if (ret == -1){
891
fprintf(stderr, "init_gnutls_global\n");
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
897
uid = getuid();
898
gid = getgid();
899
900
ret = setuid(uid);
901
if (ret == -1){
902
perror("setuid");
903
}
904
905
setgid(gid);
906
if (ret == -1){
907
perror("setgid");
908
}
909
1131
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
1132
911
if(if_index == 0){
1133
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1134
exitcode = EXIT_FAILURE;
1135
goto end;
1136
}
1137
}
1138
1139
if(connect_to != NULL){
1140
/* Connect directly, do not use Zeroconf */
1141
/* (Mainly meant for debugging) */
1142
char *address = strrchr(connect_to, ':');
1143
if(address == NULL){
1144
fprintf(stderr, "No colon in address\n");
1145
exitcode = EXIT_FAILURE;
1146
goto end;
1147
}
1148
uint16_t port;
1149
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1150
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1151
or address[numchars+1] != '\0'){
1152
fprintf(stderr, "Bad port number\n");
1153
exitcode = EXIT_FAILURE;
1154
goto end;
1155
}
1156
port = (uint16_t)tmpmax;
1157
*address = '\0';
1158
address = connect_to;
1159
/* Colon in address indicates IPv6 */
1160
int af;
1161
if(strchr(address, ':') != NULL){
1162
af = AF_INET6;
1163
} else {
1164
af = AF_INET;
1165
}
1166
ret = start_mandos_communication(address, port, if_index,
1167
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
913
exit(EXIT_FAILURE);
914
}
915
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
920
if(address == NULL){
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
923
goto end;
924
}
925
errno = 0;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
927
if(errno){
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
930
goto end;
931
}
932
*address = '\0';
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
935
if(ret < 0){
936
exitcode = EXIT_FAILURE;
937
} else {
938
exitcode = EXIT_SUCCESS;
939
}
940
goto end;
941
}
942
943
/* If the interface is down, bring it up */
944
{
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
946
if(sd < 0) {
947
perror("socket");
948
exitcode = EXIT_FAILURE;
949
goto end;
950
}
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
953
if(ret == -1){
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
956
goto end;
957
}
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
961
if(ret == -1){
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
964
goto end;
965
}
966
}
967
close(sd);
968
}
969
970
if (not debug){
971
avahi_set_log_function(empty_log);
972
}
973
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
976
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
981
" object.\n");
982
exitcode = EXIT_FAILURE;
983
goto end;
984
}
985
986
{
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
994
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
998
NULL, &error);
999
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1002
}
1003
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1009
goto end;
1010
}
1011
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
AVAHI_PROTO_INET6,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1017
if (sb == NULL) {
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1021
goto end;
1022
}
1023
1024
/* Run the main loop */
1025
1026
if (debug){
1027
fprintf(stderr, "Starting Avahi loop search\n");
1028
}
1029
1030
avahi_simple_poll_loop(mc.simple_poll);
1031
1250
1032
end:
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;
1033
1034
if (debug){
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1036
}
1037
1038
/* Cleanup things */
1039
if (sb != NULL)
1040
avahi_s_service_browser_free(sb);
1041
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1053
}
1054
1055
return exitcode;
1321
1056
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0