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- Committer: Teddy Hogeborn
- Date: 2008-08-04 16:05:01 UTC
- mfrom: (24.1.15 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804160501-woej7nf8amgrbc2e
* plugins.d/mandosclient.c (start_mandos_communication): Change "to"
to be a union. All users changed.
to be a union. All users changed.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
plugins.d/mandosclient.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
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
56
#include <sys/stat.h> /* open() */
57
#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() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
34
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
37
#include <stdio.h>
38
#include <assert.h>
39
#include <stdlib.h>
40
#include <time.h>
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
43
SIOCSIFFLAGS */
67
44
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
72
*/
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
75
setgid() */
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
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
90
/* Avahi */
91
/* All Avahi types, constants and functions
92
Avahi*, avahi_*,
93
AVAHI_* */
45
SIOCSIFFLAGS */
46
94
47
#include <avahi-core/core.h>
95
48
#include <avahi-core/lookup.h>
96
49
#include <avahi-core/log.h>
98
51
#include <avahi-common/malloc.h>
99
52
#include <avahi-common/error.h>
100
53
101
/* GnuTLS */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
103
functions:
104
gnutls_*
105
init_gnutls_session(),
106
GNUTLS_* */
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
110
60
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
70
argp_parse() */
111
71
/* GPGME */
112
#include <gpgme.h> /* All GPGME types, constants and
113
functions:
114
gpgme_*
115
GPGME_PROTOCOL_OpenPGP,
116
GPG_ERR_NO_* */
72
#include <errno.h> /* perror() */
73
#include <gpgme.h>
117
74
118
75
#define BUFFER_SIZE 256
119
76
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
123
124
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
125
81
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
128
82
129
83
/* Used for passing in values through the Avahi callback functions */
130
84
typedef struct {
134
88
unsigned int dh_bits;
135
89
gnutls_dh_params_t dh_params;
136
90
const char *priority;
137
gpgme_ctx_t ctx;
138
91
} mandos_context;
139
92
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
/*
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
148
* "buffer_length" is how much is already used.
149
*/
150
size_t incbuffer(char **buffer, size_t buffer_length,
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
151
97
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
153
99
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
154
if(buffer == NULL){
100
if (buffer == NULL){
155
101
return 0;
156
102
}
157
103
buffer_capacity += BUFFER_SIZE;
160
106
}
161
107
162
108
/*
163
* Initialize GPGME.
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
164
111
*/
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
167
int ret;
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
113
size_t crypto_size,
114
char **plaintext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
117
gpgme_ctx_t ctx;
168
118
gpgme_error_t rc;
119
ssize_t ret;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
169
122
gpgme_engine_info_t engine_info;
170
123
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");
124
if (debug){
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
209
126
}
210
127
211
128
/* Init GPGME */
212
129
gpgme_check_version(NULL);
213
130
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
214
if(rc != GPG_ERR_NO_ERROR){
131
if (rc != GPG_ERR_NO_ERROR){
215
132
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
133
gpgme_strsource(rc), gpgme_strerror(rc));
217
return false;
134
return -1;
218
135
}
219
136
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){
137
/* Set GPGME home directory for the OpenPGP engine only */
138
rc = gpgme_get_engine_info (&engine_info);
139
if (rc != GPG_ERR_NO_ERROR){
223
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
141
gpgme_strsource(rc), gpgme_strerror(rc));
225
return false;
142
return -1;
226
143
}
227
144
while(engine_info != NULL){
228
145
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
229
146
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
230
engine_info->file_name, tempdir);
147
engine_info->file_name, homedir);
231
148
break;
232
149
}
233
150
engine_info = engine_info->next;
234
151
}
235
152
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");
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
154
return -1;
270
155
}
271
156
272
157
/* Create new GPGME data buffer from memory cryptotext */
273
158
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
274
159
0);
275
if(rc != GPG_ERR_NO_ERROR){
160
if (rc != GPG_ERR_NO_ERROR){
276
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
162
gpgme_strsource(rc), gpgme_strerror(rc));
278
163
return -1;
280
165
281
166
/* Create new empty GPGME data buffer for the plaintext */
282
167
rc = gpgme_data_new(&dh_plain);
283
if(rc != GPG_ERR_NO_ERROR){
168
if (rc != GPG_ERR_NO_ERROR){
284
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
170
gpgme_strsource(rc), gpgme_strerror(rc));
286
171
gpgme_data_release(dh_crypto);
287
172
return -1;
288
173
}
289
174
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
181
goto decrypt_end;
182
}
183
290
184
/* Decrypt data from the cryptotext data buffer to the plaintext
291
185
data buffer */
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
293
if(rc != GPG_ERR_NO_ERROR){
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
187
if (rc != GPG_ERR_NO_ERROR){
294
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
189
gpgme_strsource(rc), gpgme_strerror(rc));
296
190
plaintext_length = -1;
297
if(debug){
298
gpgme_decrypt_result_t result;
299
result = gpgme_op_decrypt_result(mc.ctx);
300
if(result == NULL){
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
302
} else {
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
307
if(result->file_name != NULL){
308
fprintf(stderr, "File name: %s\n", result->file_name);
309
}
310
gpgme_recipient_t recipient;
311
recipient = result->recipients;
312
if(recipient){
313
while(recipient != NULL){
314
fprintf(stderr, "Public key algorithm: %s\n",
315
gpgme_pubkey_algo_name(recipient->pubkey_algo));
316
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
317
fprintf(stderr, "Secret key available: %s\n",
318
recipient->status == GPG_ERR_NO_SECKEY
319
? "No" : "Yes");
320
recipient = recipient->next;
321
}
322
}
323
}
324
}
325
191
goto decrypt_end;
326
192
}
327
193
329
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
330
196
}
331
197
198
if (debug){
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
201
if (result == NULL){
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
} else {
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
210
}
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
213
if(recipient){
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
220
? "No" : "Yes");
221
recipient = recipient->next;
222
}
223
}
224
}
225
}
226
332
227
/* 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");
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
335
230
plaintext_length = -1;
336
231
goto decrypt_end;
337
232
}
338
233
339
234
*plaintext = NULL;
340
235
while(true){
341
plaintext_capacity = incbuffer(plaintext,
236
plaintext_capacity = adjustbuffer(plaintext,
342
237
(size_t)plaintext_length,
343
238
plaintext_capacity);
344
if(plaintext_capacity == 0){
345
perror("incbuffer");
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
346
241
plaintext_length = -1;
347
242
goto decrypt_end;
348
243
}
350
245
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
351
246
BUFFER_SIZE);
352
247
/* Print the data, if any */
353
if(ret == 0){
248
if (ret == 0){
354
249
/* EOF */
355
250
break;
356
251
}
361
256
}
362
257
plaintext_length += ret;
363
258
}
364
259
365
260
if(debug){
366
261
fprintf(stderr, "Decrypted password is: ");
367
262
for(ssize_t i = 0; i < plaintext_length; i++){
380
275
return plaintext_length;
381
276
}
382
277
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)
278
static const char * safer_gnutls_strerror (int value) {
279
const char *ret = gnutls_strerror (value);
280
if (ret == NULL)
387
281
ret = "(unknown)";
388
282
return ret;
389
283
}
394
288
fprintf(stderr, "GnuTLS: %s", string);
395
289
}
396
290
397
static int init_gnutls_global(const char *pubkeyfilename,
398
const char *seckeyfilename){
291
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
399
294
int ret;
400
295
401
296
if(debug){
402
297
fprintf(stderr, "Initializing GnuTLS\n");
403
298
}
404
405
ret = gnutls_global_init();
406
if(ret != GNUTLS_E_SUCCESS){
407
fprintf(stderr, "GnuTLS global_init: %s\n",
408
safer_gnutls_strerror(ret));
299
300
if ((ret = gnutls_global_init ())
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "GnuTLS global_init: %s\n",
303
safer_gnutls_strerror(ret));
409
304
return -1;
410
305
}
411
306
412
if(debug){
307
if (debug){
413
308
/* "Use a log level over 10 to enable all debugging options."
414
309
* - GnuTLS manual
415
310
*/
418
313
}
419
314
420
315
/* 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();
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
317
!= GNUTLS_E_SUCCESS) {
318
fprintf (stderr, "GnuTLS memory error: %s\n",
319
safer_gnutls_strerror(ret));
429
320
return -1;
430
321
}
431
322
432
323
if(debug){
433
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
434
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
435
seckeyfilename);
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
326
seckeyfile);
436
327
}
437
328
438
329
ret = gnutls_certificate_set_openpgp_key_file
439
(mc.cred, pubkeyfilename, seckeyfilename,
440
GNUTLS_OPENPGP_FMT_BASE64);
441
if(ret != GNUTLS_E_SUCCESS){
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
442
332
fprintf(stderr,
443
333
"Error[%d] while reading the OpenPGP key pair ('%s',"
444
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
445
fprintf(stderr, "The GnuTLS error is: %s\n",
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
446
336
safer_gnutls_strerror(ret));
447
goto globalfail;
337
return -1;
448
338
}
449
339
450
340
/* 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
341
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
345
return -1;
346
}
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
351
return -1;
352
}
353
354
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
355
466
356
return 0;
467
468
globalfail:
469
470
gnutls_certificate_free_credentials(mc.cred);
471
gnutls_global_deinit();
472
gnutls_dh_params_deinit(mc.dh_params);
473
return -1;
474
357
}
475
358
476
static int init_gnutls_session(gnutls_session_t *session){
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
477
361
int ret;
478
362
/* GnuTLS session creation */
479
363
ret = gnutls_init(session, GNUTLS_SERVER);
480
if(ret != GNUTLS_E_SUCCESS){
364
if (ret != GNUTLS_E_SUCCESS){
481
365
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
482
366
safer_gnutls_strerror(ret));
483
367
}
484
368
485
369
{
486
370
const char *err;
487
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
488
if(ret != GNUTLS_E_SUCCESS){
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
489
373
fprintf(stderr, "Syntax error at: %s\n", err);
490
374
fprintf(stderr, "GnuTLS error: %s\n",
491
375
safer_gnutls_strerror(ret));
492
gnutls_deinit(*session);
493
376
return -1;
494
377
}
495
378
}
496
379
497
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
498
mc.cred);
499
if(ret != GNUTLS_E_SUCCESS){
381
mc->cred);
382
if (ret != GNUTLS_E_SUCCESS) {
500
383
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
501
384
safer_gnutls_strerror(ret));
502
gnutls_deinit(*session);
503
385
return -1;
504
386
}
505
387
506
388
/* ignore client certificate if any. */
507
gnutls_certificate_server_set_request(*session,
508
GNUTLS_CERT_IGNORE);
389
gnutls_certificate_server_set_request (*session,
390
GNUTLS_CERT_IGNORE);
509
391
510
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
511
393
512
394
return 0;
513
395
}
519
401
/* Called when a Mandos server is found */
520
402
static int start_mandos_communication(const char *ip, uint16_t port,
521
403
AvahiIfIndex if_index,
522
int af){
404
mandos_context *mc){
523
405
int ret, tcp_sd;
524
ssize_t sret;
525
union {
526
struct sockaddr_in in;
527
struct sockaddr_in6 in6;
528
} to;
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
529
407
char *buffer = NULL;
530
408
char *decrypted_buffer;
531
409
size_t buffer_length = 0;
533
411
ssize_t decrypted_buffer_size;
534
412
size_t written;
535
413
int retval = 0;
414
char interface[IF_NAMESIZE];
536
415
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){
416
417
ret = init_gnutls_session (mc, &session);
418
if (ret != 0){
553
419
return -1;
554
420
}
555
421
556
422
if(debug){
557
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
558
"\n", ip, port);
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
424
ip, port);
559
425
}
560
426
561
tcp_sd = socket(pf, SOCK_STREAM, 0);
562
if(tcp_sd < 0){
427
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
428
if(tcp_sd < 0) {
563
429
perror("socket");
564
430
return -1;
565
431
}
432
433
if(debug){
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
435
perror("if_indextoname");
436
return -1;
437
}
438
fprintf(stderr, "Binding to interface %s\n", interface);
439
}
566
440
567
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 ){
441
memset(&to,0,sizeof(to)); /* Spurious warning */
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
446
if (ret < 0 ){
576
447
perror("inet_pton");
577
448
return -1;
578
449
}
580
451
fprintf(stderr, "Bad address: %s\n", ip);
581
452
return -1;
582
453
}
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
}
454
to.in6.sin6_port = htons(port); /* Spurious warning */
455
456
to.in6.sin6_scope_id = (uint32_t)if_index;
604
457
605
458
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){
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
629
463
perror("inet_ntop");
630
464
} else {
631
465
if(strcmp(addrstr, ip) != 0){
634
468
}
635
469
}
636
470
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){
471
ret = connect(tcp_sd, &to.in, sizeof(to));
472
if (ret < 0){
643
473
perror("connect");
644
474
return -1;
645
475
}
646
476
647
477
const char *out = mandos_protocol_version;
648
478
written = 0;
649
while(true){
479
while (true){
650
480
size_t out_size = strlen(out);
651
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
652
482
out_size - written));
653
if(ret == -1){
483
if (ret == -1){
654
484
perror("write");
655
485
retval = -1;
656
486
goto mandos_end;
659
489
if(written < out_size){
660
490
continue;
661
491
} else {
662
if(out == mandos_protocol_version){
492
if (out == mandos_protocol_version){
663
493
written = 0;
664
494
out = "\r\n";
665
495
} else {
667
497
}
668
498
}
669
499
}
670
500
671
501
if(debug){
672
502
fprintf(stderr, "Establishing TLS session with %s\n", ip);
673
503
}
674
504
675
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
677
do{
678
ret = gnutls_handshake(session);
679
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
680
681
if(ret != GNUTLS_E_SUCCESS){
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
506
507
ret = gnutls_handshake (session);
508
509
if (ret != GNUTLS_E_SUCCESS){
682
510
if(debug){
683
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
684
gnutls_perror(ret);
512
gnutls_perror (ret);
685
513
}
686
514
retval = -1;
687
515
goto mandos_end;
690
518
/* Read OpenPGP packet that contains the wanted password */
691
519
692
520
if(debug){
693
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
694
522
ip);
695
523
}
696
524
697
525
while(true){
698
buffer_capacity = incbuffer(&buffer, buffer_length,
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
699
527
buffer_capacity);
700
if(buffer_capacity == 0){
701
perror("incbuffer");
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
702
530
retval = -1;
703
531
goto mandos_end;
704
532
}
705
533
706
sret = gnutls_record_recv(session, buffer+buffer_length,
707
BUFFER_SIZE);
708
if(sret == 0){
534
ret = gnutls_record_recv(session, buffer+buffer_length,
535
BUFFER_SIZE);
536
if (ret == 0){
709
537
break;
710
538
}
711
if(sret < 0){
712
switch(sret){
539
if (ret < 0){
540
switch(ret){
713
541
case GNUTLS_E_INTERRUPTED:
714
542
case GNUTLS_E_AGAIN:
715
543
break;
716
544
case GNUTLS_E_REHANDSHAKE:
717
do{
718
ret = gnutls_handshake(session);
719
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
720
if(ret < 0){
545
ret = gnutls_handshake (session);
546
if (ret < 0){
721
547
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
722
gnutls_perror(ret);
548
gnutls_perror (ret);
723
549
retval = -1;
724
550
goto mandos_end;
725
551
}
728
554
fprintf(stderr, "Unknown error while reading data from"
729
555
" encrypted session with Mandos server\n");
730
556
retval = -1;
731
gnutls_bye(session, GNUTLS_SHUT_RDWR);
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
732
558
goto mandos_end;
733
559
}
734
560
} else {
735
buffer_length += (size_t) sret;
561
buffer_length += (size_t) ret;
736
562
}
737
563
}
738
564
740
566
fprintf(stderr, "Closing TLS session\n");
741
567
}
742
568
743
gnutls_bye(session, GNUTLS_SHUT_RDWR);
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
744
570
745
if(buffer_length > 0){
571
if (buffer_length > 0){
746
572
decrypted_buffer_size = pgp_packet_decrypt(buffer,
747
573
buffer_length,
748
&decrypted_buffer);
749
if(decrypted_buffer_size >= 0){
574
&decrypted_buffer,
575
keydir);
576
if (decrypted_buffer_size >= 0){
750
577
written = 0;
751
578
while(written < (size_t) decrypted_buffer_size){
752
ret = (int)fwrite(decrypted_buffer + written, 1,
753
(size_t)decrypted_buffer_size - written,
754
stdout);
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
581
stdout);
755
582
if(ret == 0 and ferror(stdout)){
756
583
if(debug){
757
584
fprintf(stderr, "Error writing encrypted data: %s\n",
766
593
} else {
767
594
retval = -1;
768
595
}
769
} else {
770
retval = -1;
771
596
}
772
597
773
598
/* Shutdown procedure */
774
599
775
600
mandos_end:
776
601
free(buffer);
777
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
778
if(ret == -1){
779
perror("close");
780
}
781
gnutls_deinit(session);
602
close(tcp_sd);
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
605
gnutls_global_deinit ();
782
606
return retval;
783
607
}
784
608
785
609
static void resolve_callback(AvahiSServiceResolver *r,
786
610
AvahiIfIndex interface,
787
AvahiProtocol proto,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
788
612
AvahiResolverEvent event,
789
613
const char *name,
790
614
const char *type,
795
619
AVAHI_GCC_UNUSED AvahiStringList *txt,
796
620
AVAHI_GCC_UNUSED AvahiLookupResultFlags
797
621
flags,
798
AVAHI_GCC_UNUSED void* userdata){
799
assert(r);
622
void* userdata) {
623
mandos_context *mc = userdata;
624
assert(r); /* Spurious warning */
800
625
801
626
/* Called whenever a service has been resolved successfully or
802
627
timed out */
803
628
804
switch(event){
629
switch (event) {
805
630
default:
806
631
case AVAHI_RESOLVER_FAILURE:
807
632
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
808
633
" of type '%s' in domain '%s': %s\n", name, type, domain,
809
avahi_strerror(avahi_server_errno(mc.server)));
634
avahi_strerror(avahi_server_errno(mc->server)));
810
635
break;
811
636
812
637
case AVAHI_RESOLVER_FOUND:
814
639
char ip[AVAHI_ADDRESS_STR_MAX];
815
640
avahi_address_snprint(ip, sizeof(ip), address);
816
641
if(debug){
817
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
818
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
819
ip, (intmax_t)interface, port);
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
820
644
}
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);
645
int ret = start_mandos_communication(ip, port, interface, mc);
646
if (ret == 0){
647
exit(EXIT_SUCCESS);
825
648
}
826
649
}
827
650
}
828
651
avahi_s_service_resolver_free(r);
829
652
}
830
653
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){
841
assert(b);
654
static void browse_callback( AvahiSServiceBrowser *b,
655
AvahiIfIndex interface,
656
AvahiProtocol protocol,
657
AvahiBrowserEvent event,
658
const char *name,
659
const char *type,
660
const char *domain,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
662
flags,
663
void* userdata) {
664
mandos_context *mc = userdata;
665
assert(b); /* Spurious warning */
842
666
843
667
/* Called whenever a new services becomes available on the LAN or
844
668
is removed from the LAN */
845
669
846
switch(event){
670
switch (event) {
847
671
default:
848
672
case AVAHI_BROWSER_FAILURE:
849
673
850
674
fprintf(stderr, "(Avahi browser) %s\n",
851
avahi_strerror(avahi_server_errno(mc.server)));
852
avahi_simple_poll_quit(mc.simple_poll);
675
avahi_strerror(avahi_server_errno(mc->server)));
676
avahi_simple_poll_quit(mc->simple_poll);
853
677
return;
854
678
855
679
case AVAHI_BROWSER_NEW:
858
682
the callback function is called the Avahi server will free the
859
683
resolver for us. */
860
684
861
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
862
name, type, domain, protocol, 0,
863
resolve_callback, NULL) == NULL)
685
if (!(avahi_s_service_resolver_new(mc->server, interface,
686
protocol, name, type, domain,
687
AVAHI_PROTO_INET6, 0,
688
resolve_callback, mc)))
864
689
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
865
name, avahi_strerror(avahi_server_errno(mc.server)));
690
name, avahi_strerror(avahi_server_errno(mc->server)));
866
691
break;
867
692
868
693
case AVAHI_BROWSER_REMOVE:
877
702
}
878
703
}
879
704
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;
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
711
if (tmp == NULL){
712
return NULL;
713
}
714
if(f_len > 0){
715
memcpy(tmp, first, f_len); /* Spurious warning */
716
}
717
tmp[f_len] = '/';
718
if(s_len > 0){
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
720
}
721
tmp[f_len + 1 + s_len] = '\0';
722
return tmp;
893
723
}
894
724
725
895
726
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");
727
AvahiSServiceBrowser *sb = NULL;
728
int error;
729
int ret;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
733
int sd;
734
uid_t uid;
735
gid_t gid;
736
char *connect_to = NULL;
737
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
742
743
{
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
748
.arg = "IP",
749
.doc = "Connect directly to a sepcified mandos server",
750
.group = 1 },
751
{ .name = "interface", .key = 'i',
752
.arg = "INTERFACE",
753
.doc = "Interface that Avahi will conntect through",
754
.group = 1 },
755
{ .name = "keydir", .key = 'd',
756
.arg = "KEYDIR",
757
.doc = "Directory where the openpgp keyring is",
758
.group = 1 },
759
{ .name = "seckey", .key = 's',
760
.arg = "SECKEY",
761
.doc = "Secret openpgp key for gnutls authentication",
762
.group = 1 },
763
{ .name = "pubkey", .key = 'p',
764
.arg = "PUBKEY",
765
.doc = "Public openpgp key for gnutls authentication",
766
.group = 2 },
767
{ .name = "dh-bits", .key = 129,
768
.arg = "BITS",
769
.doc = "dh-bits to use in gnutls communication",
770
.group = 2 },
771
{ .name = "priority", .key = 130,
772
.arg = "PRIORITY",
773
.doc = "GNUTLS priority", .group = 1 },
774
{ .name = NULL }
775
};
776
777
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
782
switch (key) {
783
case 128:
784
debug = true;
785
break;
786
case 'c':
787
connect_to = arg;
788
break;
789
case 'i':
790
interface = arg;
791
break;
792
case 'd':
793
keydir = arg;
794
break;
795
case 's':
796
seckeyfile = arg;
797
break;
798
case 'p':
799
pubkeyfile = arg;
800
break;
801
case 129:
802
errno = 0;
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
804
if (errno){
805
perror("strtol");
806
exit(EXIT_FAILURE);
1113
807
}
808
break;
809
case 130:
810
mc.priority = arg;
811
break;
812
case ARGP_KEY_ARG:
813
argp_usage (state);
814
break;
815
case ARGP_KEY_END:
816
break;
817
default:
818
return ARGP_ERR_UNKNOWN;
1114
819
}
1115
#endif /* __linux__ */
1116
goto end;
1117
}
1118
}
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
if(ret == -1){
1123
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'){
820
return 0;
821
}
822
823
struct argp argp = { .options = options, .parser = parse_opt,
824
.args_doc = "",
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
828
}
829
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
833
exitcode = EXIT_FAILURE;
834
goto end;
835
}
836
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
840
goto end;
841
}
842
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
844
if (ret == -1){
845
fprintf(stderr, "init_gnutls_global\n");
846
goto end;
847
}
848
849
uid = getuid();
850
gid = getgid();
851
852
ret = setuid(uid);
853
if (ret == -1){
854
perror("setuid");
855
}
856
857
setgid(gid);
858
if (ret == -1){
859
perror("setgid");
860
}
861
1186
862
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
863
if(if_index == 0){
1188
864
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
865
exit(EXIT_FAILURE);
866
}
867
868
if(connect_to != NULL){
869
/* Connect directly, do not use Zeroconf */
870
/* (Mainly meant for debugging) */
871
char *address = strrchr(connect_to, ':');
872
if(address == NULL){
873
fprintf(stderr, "No colon in address\n");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
errno = 0;
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
879
if(errno){
880
perror("Bad port number");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
*address = '\0';
885
address = connect_to;
886
ret = start_mandos_communication(address, port, if_index, &mc);
887
if(ret < 0){
888
exitcode = EXIT_FAILURE;
889
} else {
890
exitcode = EXIT_SUCCESS;
891
}
892
goto end;
893
}
894
895
/* If the interface is down, bring it up */
896
{
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
if(sd < 0) {
899
perror("socket");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
if(ret == -1){
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
908
goto end;
909
}
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
if(ret == -1){
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
916
goto end;
917
}
918
}
919
close(sd);
920
}
921
922
if (not debug){
923
avahi_set_log_function(empty_log);
924
}
925
926
/* Initialize the pseudo-RNG for Avahi */
927
srand((unsigned int) time(NULL));
928
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
933
" object.\n");
934
exitcode = EXIT_FAILURE;
935
goto end;
936
}
937
938
{
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
946
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
950
NULL, &error);
951
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
954
}
955
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
959
avahi_strerror(error));
960
exitcode = EXIT_FAILURE;
961
goto end;
962
}
963
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
966
AVAHI_PROTO_INET6,
967
"_mandos._tcp", NULL, 0,
968
browse_callback, &mc);
969
if (sb == NULL) {
970
fprintf(stderr, "Failed to create service browser: %s\n",
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
973
goto end;
974
}
975
976
/* Run the main loop */
977
978
if (debug){
979
fprintf(stderr, "Starting Avahi loop search\n");
980
}
981
982
avahi_simple_poll_loop(mc.simple_poll);
983
1276
984
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;
985
986
if (debug){
987
fprintf(stderr, "%s exiting\n", argv[0]);
988
}
989
990
/* Cleanup things */
991
if (sb != NULL)
992
avahi_s_service_browser_free(sb);
993
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
996
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
999
free(pubkeyfile);
1000
free(seckeyfile);
1001
1002
return exitcode;
1347
1003
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0