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- Committer: Teddy Hogeborn
- Date: 2008-08-09 04:56:00 UTC
- mfrom: (24.1.27 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080809045600-m7jx3tj4wwunaffa
Merge.
- 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, ferror() */
41
38
#include <stdint.h> /* uint16_t, uint32_t */
42
39
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, false, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
40
#include <stdlib.h> /* free() */
41
#include <stdbool.h> /* bool, true */
42
#include <string.h> /* memset(), strcmp(), strlen, strerror() */
43
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
44
SIOCSIFFLAGS */
49
45
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, uid_t, gid_t, open(),
52
opendir(), DIR */
53
#include <sys/stat.h> /* open() */
46
sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */
54
47
#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 */
60
#include <assert.h> /* assert() */
61
#include <errno.h> /* perror(), errno */
62
#include <time.h> /* nanosleep(), time() */
48
struct in6_addr, inet_pton(),
49
connect() */
50
#include <assert.h>
51
#include <errno.h> /* perror() */
52
#include <time.h>
63
53
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
64
54
SIOCSIFFLAGS, if_indextoname(),
65
55
if_nametoindex(), IF_NAMESIZE */
66
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
67
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
68
*/
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
71
setgid() */
56
#include <unistd.h> /* close(), SEEK_SET, off_t, write()*/
57
#include <netinet/in.h>
72
58
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, or, and */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
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
59
#include <iso646.h> /* not */
60
#include <argp.h> /* struct argp_option,
61
struct argp_state, struct argp,
62
argp_parse() */
82
63
83
64
/* Avahi */
84
/* All Avahi types, constants and functions
85
Avahi*, avahi_*,
86
AVAHI_* */
87
#include <avahi-core/core.h>
65
#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,
66
AvahiIfIndex */
88
67
#include <avahi-core/lookup.h>
89
#include <avahi-core/log.h>
68
#include <avahi-core/log.h> /* AvahiLogLevel */
90
69
#include <avahi-common/simple-watch.h>
91
70
#include <avahi-common/malloc.h>
92
71
#include <avahi-common/error.h>
93
72
94
73
/* GnuTLS */
95
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
96
functions:
97
gnutls_*
74
#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,
75
gnutls_dh_params_t,
76
gnutls_strerror(),
77
gnutls_global_init(),
78
gnutls_global_set_log_level(),
79
gnutls_global_set_log_function(),
80
gnutls_certificate_allocate_credentials(),
81
gnutls_global_deinit(),
82
gnutls_dh_params_init(),
83
gnutls_dh_params_generate(),
84
gnutls_certificate_set_dh_params(),
85
gnutls_certificate_free_credentials(),
86
gnutls_session_t, gnutls_init(),
87
gnutls_priority_set_direct(),
88
gnutls_deinit(),
89
gnutls_credentials_set(),
90
gnutls_certificate_server_set_request(),
91
gnutls_dh_set_prime_bits(),
92
gnutls_transport_set_ptr(),
93
gnutls_transport_ptr_t,
94
gnutls_handshake(),
95
gnutls_record_recv()
96
gnutls_perror(), gnutls_bye(),
98
97
init_gnutls_session(),
99
GNUTLS_* */
100
#include <gnutls/openpgp.h>
101
/* gnutls_certificate_set_openpgp_key_file(),
102
GNUTLS_OPENPGP_FMT_BASE64 */
98
GNUTLS_E_SUCCESS,
99
GNUTLS_CRD_CERTIFICATE,
100
GNUTLS_CERT_IGNORE,
101
GNUTLS_E_INTERRUPTED,
102
GNUTLS_E_AGAIN,
103
GNUTLS_E_REHANDSHAKE,
104
GNUTLS_SHUT_RDWR, */
105
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
106
GNUTLS_OPENPGP_FMT_BASE64 */
103
107
104
108
/* GPGME */
105
#include <gpgme.h> /* All GPGME types, constants and
106
functions:
107
gpgme_*
109
#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,
110
gpgme_error_t, gpgme_engine_info_t,
111
gpgme_check_version(),
112
gpgme_engine_check_version(),
113
gpgme_strsource(),
114
gpgme_strerror(),
115
gpgme_get_engine_info(),
116
gpgme_set_engine_info(),
117
gpgme_data_new_from_mem(),
118
gpgme_data_new(), gpgme_new(),
119
gpgme_op_decrypt(),
120
gpgme_decrypt_result_t,
121
gpgme_op_decrypt_result(),
122
gpgme_recipient_t,
123
gpgme_pubkey_algo_name(),
124
gpgme_data_seek(),
125
gpgme_data_read(),
126
gpgme_data_release()
108
127
GPGME_PROTOCOL_OpenPGP,
109
GPG_ERR_NO_* */
128
GPG_ERR_NO_ERROR,
129
GPG_ERR_NO_SECKEY, */
110
130
111
131
#define BUFFER_SIZE 256
112
132
113
#define PATHDIR "/conf/conf.d/mandos"
114
#define SECKEY "seckey.txt"
115
#define PUBKEY "pubkey.txt"
116
117
133
bool debug = false;
134
static const char *keydir = "/conf/conf.d/mandos";
118
135
static const char mandos_protocol_version[] = "1";
119
const char *argp_program_version = "mandos-client " VERSION;
136
const char *argp_program_version = "mandosclient 0.9";
120
137
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
121
138
122
139
/* Used for passing in values through the Avahi callback functions */
127
144
unsigned int dh_bits;
128
145
gnutls_dh_params_t dh_params;
129
146
const char *priority;
130
gpgme_ctx_t ctx;
131
147
} mandos_context;
132
148
133
/* global context so signal handler can reach it*/
134
mandos_context mc;
135
136
149
/*
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.
150
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
151
* "buffer_capacity" is how much is currently allocated,
152
* "buffer_length" is how much is already used.
140
153
*/
141
size_t incbuffer(char **buffer, size_t buffer_length,
154
size_t adjustbuffer(char **buffer, size_t buffer_length,
142
155
size_t buffer_capacity){
143
if(buffer_length + BUFFER_SIZE > buffer_capacity){
156
if (buffer_length + BUFFER_SIZE > buffer_capacity){
144
157
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
145
if(buffer == NULL){
158
if (buffer == NULL){
146
159
return 0;
147
160
}
148
161
buffer_capacity += BUFFER_SIZE;
151
164
}
152
165
153
166
/*
154
* Initialize GPGME.
167
* Decrypt OpenPGP data using keyrings in HOMEDIR.
168
* Returns -1 on error
155
169
*/
156
static bool init_gpgme(const char *seckey,
157
const char *pubkey, const char *tempdir){
158
int ret;
170
static ssize_t pgp_packet_decrypt (const char *cryptotext,
171
size_t crypto_size,
172
char **plaintext,
173
const char *homedir){
174
gpgme_data_t dh_crypto, dh_plain;
175
gpgme_ctx_t ctx;
159
176
gpgme_error_t rc;
177
ssize_t ret;
178
size_t plaintext_capacity = 0;
179
ssize_t plaintext_length = 0;
160
180
gpgme_engine_info_t engine_info;
161
181
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");
182
if (debug){
183
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
200
184
}
201
185
202
186
/* Init GPGME */
203
187
gpgme_check_version(NULL);
204
188
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
205
if(rc != GPG_ERR_NO_ERROR){
189
if (rc != GPG_ERR_NO_ERROR){
206
190
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
207
191
gpgme_strsource(rc), gpgme_strerror(rc));
208
return false;
192
return -1;
209
193
}
210
194
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){
195
/* Set GPGME home directory for the OpenPGP engine only */
196
rc = gpgme_get_engine_info (&engine_info);
197
if (rc != GPG_ERR_NO_ERROR){
214
198
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
215
199
gpgme_strsource(rc), gpgme_strerror(rc));
216
return false;
200
return -1;
217
201
}
218
202
while(engine_info != NULL){
219
203
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
220
204
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
221
engine_info->file_name, tempdir);
205
engine_info->file_name, homedir);
222
206
break;
223
207
}
224
208
engine_info = engine_info->next;
225
209
}
226
210
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");
211
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
212
return -1;
261
213
}
262
214
263
215
/* Create new GPGME data buffer from memory cryptotext */
264
216
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
265
217
0);
266
if(rc != GPG_ERR_NO_ERROR){
218
if (rc != GPG_ERR_NO_ERROR){
267
219
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
268
220
gpgme_strsource(rc), gpgme_strerror(rc));
269
221
return -1;
271
223
272
224
/* Create new empty GPGME data buffer for the plaintext */
273
225
rc = gpgme_data_new(&dh_plain);
274
if(rc != GPG_ERR_NO_ERROR){
226
if (rc != GPG_ERR_NO_ERROR){
275
227
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
276
228
gpgme_strsource(rc), gpgme_strerror(rc));
277
229
gpgme_data_release(dh_crypto);
278
230
return -1;
279
231
}
280
232
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&ctx);
235
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
plaintext_length = -1;
239
goto decrypt_end;
240
}
241
281
242
/* Decrypt data from the cryptotext data buffer to the plaintext
282
243
data buffer */
283
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
284
if(rc != GPG_ERR_NO_ERROR){
244
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
245
if (rc != GPG_ERR_NO_ERROR){
285
246
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
286
247
gpgme_strsource(rc), gpgme_strerror(rc));
287
248
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
249
goto decrypt_end;
317
250
}
318
251
320
253
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
321
254
}
322
255
256
if (debug){
257
gpgme_decrypt_result_t result;
258
result = gpgme_op_decrypt_result(ctx);
259
if (result == NULL){
260
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
261
} else {
262
fprintf(stderr, "Unsupported algorithm: %s\n",
263
result->unsupported_algorithm);
264
fprintf(stderr, "Wrong key usage: %d\n",
265
result->wrong_key_usage);
266
if(result->file_name != NULL){
267
fprintf(stderr, "File name: %s\n", result->file_name);
268
}
269
gpgme_recipient_t recipient;
270
recipient = result->recipients;
271
if(recipient){
272
while(recipient != NULL){
273
fprintf(stderr, "Public key algorithm: %s\n",
274
gpgme_pubkey_algo_name(recipient->pubkey_algo));
275
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
276
fprintf(stderr, "Secret key available: %s\n",
277
recipient->status == GPG_ERR_NO_SECKEY
278
? "No" : "Yes");
279
recipient = recipient->next;
280
}
281
}
282
}
283
}
284
323
285
/* 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");
286
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
287
perror("pgpme_data_seek");
326
288
plaintext_length = -1;
327
289
goto decrypt_end;
328
290
}
329
291
330
292
*plaintext = NULL;
331
293
while(true){
332
plaintext_capacity = incbuffer(plaintext,
294
plaintext_capacity = adjustbuffer(plaintext,
333
295
(size_t)plaintext_length,
334
296
plaintext_capacity);
335
if(plaintext_capacity == 0){
336
perror("incbuffer");
297
if (plaintext_capacity == 0){
298
perror("adjustbuffer");
337
299
plaintext_length = -1;
338
300
goto decrypt_end;
339
301
}
341
303
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
342
304
BUFFER_SIZE);
343
305
/* Print the data, if any */
344
if(ret == 0){
306
if (ret == 0){
345
307
/* EOF */
346
308
break;
347
309
}
352
314
}
353
315
plaintext_length += ret;
354
316
}
355
317
356
318
if(debug){
357
319
fprintf(stderr, "Decrypted password is: ");
358
320
for(ssize_t i = 0; i < plaintext_length; i++){
371
333
return plaintext_length;
372
334
}
373
335
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)
336
static const char * safer_gnutls_strerror (int value) {
337
const char *ret = gnutls_strerror (value);
338
if (ret == NULL)
378
339
ret = "(unknown)";
379
340
return ret;
380
341
}
385
346
fprintf(stderr, "GnuTLS: %s", string);
386
347
}
387
348
388
static int init_gnutls_global(const char *pubkeyfilename,
389
const char *seckeyfilename){
349
static int init_gnutls_global(mandos_context *mc,
350
const char *pubkeyfile,
351
const char *seckeyfile){
390
352
int ret;
391
353
392
354
if(debug){
393
355
fprintf(stderr, "Initializing GnuTLS\n");
394
356
}
395
396
ret = gnutls_global_init();
397
if(ret != GNUTLS_E_SUCCESS){
398
fprintf(stderr, "GnuTLS global_init: %s\n",
399
safer_gnutls_strerror(ret));
357
358
if ((ret = gnutls_global_init ())
359
!= GNUTLS_E_SUCCESS) {
360
fprintf (stderr, "GnuTLS global_init: %s\n",
361
safer_gnutls_strerror(ret));
400
362
return -1;
401
363
}
402
364
403
if(debug){
365
if (debug){
404
366
/* "Use a log level over 10 to enable all debugging options."
405
367
* - GnuTLS manual
406
368
*/
409
371
}
410
372
411
373
/* 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();
374
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
375
!= GNUTLS_E_SUCCESS) {
376
fprintf (stderr, "GnuTLS memory error: %s\n",
377
safer_gnutls_strerror(ret));
378
gnutls_global_deinit ();
420
379
return -1;
421
380
}
422
381
423
382
if(debug){
424
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
425
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
426
seckeyfilename);
383
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
384
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
385
seckeyfile);
427
386
}
428
387
429
388
ret = gnutls_certificate_set_openpgp_key_file
430
(mc.cred, pubkeyfilename, seckeyfilename,
431
GNUTLS_OPENPGP_FMT_BASE64);
432
if(ret != GNUTLS_E_SUCCESS){
389
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
390
if (ret != GNUTLS_E_SUCCESS) {
433
391
fprintf(stderr,
434
392
"Error[%d] while reading the OpenPGP key pair ('%s',"
435
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
436
fprintf(stderr, "The GnuTLS error is: %s\n",
393
" '%s')\n", ret, pubkeyfile, seckeyfile);
394
fprintf(stdout, "The GnuTLS error is: %s\n",
437
395
safer_gnutls_strerror(ret));
438
396
goto globalfail;
439
397
}
440
398
441
399
/* 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
400
ret = gnutls_dh_params_init(&mc->dh_params);
401
if (ret != GNUTLS_E_SUCCESS) {
402
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
403
" %s\n", safer_gnutls_strerror(ret));
404
goto globalfail;
405
}
406
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
409
safer_gnutls_strerror(ret));
410
goto globalfail;
411
}
412
413
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
414
457
415
return 0;
458
416
459
417
globalfail:
460
461
gnutls_certificate_free_credentials(mc.cred);
418
419
gnutls_certificate_free_credentials(mc->cred);
462
420
gnutls_global_deinit();
463
gnutls_dh_params_deinit(mc.dh_params);
464
421
return -1;
422
465
423
}
466
424
467
static int init_gnutls_session(gnutls_session_t *session){
425
static int init_gnutls_session(mandos_context *mc,
426
gnutls_session_t *session){
468
427
int ret;
469
428
/* GnuTLS session creation */
470
429
ret = gnutls_init(session, GNUTLS_SERVER);
471
if(ret != GNUTLS_E_SUCCESS){
430
if (ret != GNUTLS_E_SUCCESS){
472
431
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
473
432
safer_gnutls_strerror(ret));
474
433
}
475
434
476
435
{
477
436
const char *err;
478
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
479
if(ret != GNUTLS_E_SUCCESS){
437
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
438
if (ret != GNUTLS_E_SUCCESS) {
480
439
fprintf(stderr, "Syntax error at: %s\n", err);
481
440
fprintf(stderr, "GnuTLS error: %s\n",
482
441
safer_gnutls_strerror(ret));
483
gnutls_deinit(*session);
442
gnutls_deinit (*session);
484
443
return -1;
485
444
}
486
445
}
487
446
488
447
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
489
mc.cred);
490
if(ret != GNUTLS_E_SUCCESS){
448
mc->cred);
449
if (ret != GNUTLS_E_SUCCESS) {
491
450
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
492
451
safer_gnutls_strerror(ret));
493
gnutls_deinit(*session);
452
gnutls_deinit (*session);
494
453
return -1;
495
454
}
496
455
497
456
/* ignore client certificate if any. */
498
gnutls_certificate_server_set_request(*session,
499
GNUTLS_CERT_IGNORE);
457
gnutls_certificate_server_set_request (*session,
458
GNUTLS_CERT_IGNORE);
500
459
501
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
460
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
502
461
503
462
return 0;
504
463
}
510
469
/* Called when a Mandos server is found */
511
470
static int start_mandos_communication(const char *ip, uint16_t port,
512
471
AvahiIfIndex if_index,
513
int af){
472
mandos_context *mc){
514
473
int ret, tcp_sd;
515
ssize_t sret;
516
union {
517
struct sockaddr_in in;
518
struct sockaddr_in6 in6;
519
} to;
474
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
520
475
char *buffer = NULL;
521
476
char *decrypted_buffer;
522
477
size_t buffer_length = 0;
524
479
ssize_t decrypted_buffer_size;
525
480
size_t written;
526
481
int retval = 0;
482
char interface[IF_NAMESIZE];
527
483
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){
484
485
ret = init_gnutls_session (mc, &session);
486
if (ret != 0){
544
487
return -1;
545
488
}
546
489
547
490
if(debug){
548
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
549
"\n", ip, port);
491
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
492
ip, port);
550
493
}
551
494
552
tcp_sd = socket(pf, SOCK_STREAM, 0);
553
if(tcp_sd < 0){
495
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
496
if(tcp_sd < 0) {
554
497
perror("socket");
555
498
return -1;
556
499
}
500
501
if(debug){
502
if(if_indextoname((unsigned int)if_index, interface) == NULL){
503
perror("if_indextoname");
504
return -1;
505
}
506
fprintf(stderr, "Binding to interface %s\n", interface);
507
}
557
508
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 ){
509
memset(&to,0,sizeof(to)); /* Spurious warning */
510
to.in6.sin6_family = AF_INET6;
511
/* It would be nice to have a way to detect if we were passed an
512
IPv4 address here. Now we assume an IPv6 address. */
513
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
514
if (ret < 0 ){
567
515
perror("inet_pton");
568
516
return -1;
569
517
}
571
519
fprintf(stderr, "Bad address: %s\n", ip);
572
520
return -1;
573
521
}
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
}
522
to.in6.sin6_port = htons(port); /* Spurious warning */
523
524
to.in6.sin6_scope_id = (uint32_t)if_index;
595
525
596
526
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){
527
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
528
char addrstr[INET6_ADDRSTRLEN] = "";
529
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
530
sizeof(addrstr)) == NULL){
620
531
perror("inet_ntop");
621
532
} else {
622
533
if(strcmp(addrstr, ip) != 0){
625
536
}
626
537
}
627
538
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){
539
ret = connect(tcp_sd, &to.in, sizeof(to));
540
if (ret < 0){
634
541
perror("connect");
635
542
return -1;
636
543
}
637
544
638
545
const char *out = mandos_protocol_version;
639
546
written = 0;
640
while(true){
547
while (true){
641
548
size_t out_size = strlen(out);
642
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
549
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
643
550
out_size - written));
644
if(ret == -1){
551
if (ret == -1){
645
552
perror("write");
646
553
retval = -1;
647
554
goto mandos_end;
650
557
if(written < out_size){
651
558
continue;
652
559
} else {
653
if(out == mandos_protocol_version){
560
if (out == mandos_protocol_version){
654
561
written = 0;
655
562
out = "\r\n";
656
563
} else {
658
565
}
659
566
}
660
567
}
661
568
662
569
if(debug){
663
570
fprintf(stderr, "Establishing TLS session with %s\n", ip);
664
571
}
665
572
666
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
667
668
do{
669
ret = gnutls_handshake(session);
670
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
671
672
if(ret != GNUTLS_E_SUCCESS){
573
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
574
575
ret = gnutls_handshake (session);
576
577
if (ret != GNUTLS_E_SUCCESS){
673
578
if(debug){
674
579
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
675
gnutls_perror(ret);
580
gnutls_perror (ret);
676
581
}
677
582
retval = -1;
678
583
goto mandos_end;
681
586
/* Read OpenPGP packet that contains the wanted password */
682
587
683
588
if(debug){
684
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
589
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
685
590
ip);
686
591
}
687
592
688
593
while(true){
689
buffer_capacity = incbuffer(&buffer, buffer_length,
594
buffer_capacity = adjustbuffer(&buffer, buffer_length,
690
595
buffer_capacity);
691
if(buffer_capacity == 0){
692
perror("incbuffer");
596
if (buffer_capacity == 0){
597
perror("adjustbuffer");
693
598
retval = -1;
694
599
goto mandos_end;
695
600
}
696
601
697
sret = gnutls_record_recv(session, buffer+buffer_length,
698
BUFFER_SIZE);
699
if(sret == 0){
602
ret = gnutls_record_recv(session, buffer+buffer_length,
603
BUFFER_SIZE);
604
if (ret == 0){
700
605
break;
701
606
}
702
if(sret < 0){
703
switch(sret){
607
if (ret < 0){
608
switch(ret){
704
609
case GNUTLS_E_INTERRUPTED:
705
610
case GNUTLS_E_AGAIN:
706
611
break;
707
612
case GNUTLS_E_REHANDSHAKE:
708
do{
709
ret = gnutls_handshake(session);
710
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
711
if(ret < 0){
613
ret = gnutls_handshake (session);
614
if (ret < 0){
712
615
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
713
gnutls_perror(ret);
616
gnutls_perror (ret);
714
617
retval = -1;
715
618
goto mandos_end;
716
619
}
719
622
fprintf(stderr, "Unknown error while reading data from"
720
623
" encrypted session with Mandos server\n");
721
624
retval = -1;
722
gnutls_bye(session, GNUTLS_SHUT_RDWR);
625
gnutls_bye (session, GNUTLS_SHUT_RDWR);
723
626
goto mandos_end;
724
627
}
725
628
} else {
726
buffer_length += (size_t) sret;
629
buffer_length += (size_t) ret;
727
630
}
728
631
}
729
632
731
634
fprintf(stderr, "Closing TLS session\n");
732
635
}
733
636
734
gnutls_bye(session, GNUTLS_SHUT_RDWR);
637
gnutls_bye (session, GNUTLS_SHUT_RDWR);
735
638
736
if(buffer_length > 0){
639
if (buffer_length > 0){
737
640
decrypted_buffer_size = pgp_packet_decrypt(buffer,
738
641
buffer_length,
739
&decrypted_buffer);
740
if(decrypted_buffer_size >= 0){
642
&decrypted_buffer,
643
keydir);
644
if (decrypted_buffer_size >= 0){
741
645
written = 0;
742
646
while(written < (size_t) decrypted_buffer_size){
743
ret = (int)fwrite(decrypted_buffer + written, 1,
744
(size_t)decrypted_buffer_size - written,
745
stdout);
647
ret = (int)fwrite (decrypted_buffer + written, 1,
648
(size_t)decrypted_buffer_size - written,
649
stdout);
746
650
if(ret == 0 and ferror(stdout)){
747
651
if(debug){
748
652
fprintf(stderr, "Error writing encrypted data: %s\n",
757
661
} else {
758
662
retval = -1;
759
663
}
760
} else {
761
retval = -1;
762
664
}
763
665
764
666
/* Shutdown procedure */
765
667
766
668
mandos_end:
767
669
free(buffer);
768
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
769
if(ret == -1){
770
perror("close");
771
}
772
gnutls_deinit(session);
670
close(tcp_sd);
671
gnutls_deinit (session);
773
672
return retval;
774
673
}
775
674
776
675
static void resolve_callback(AvahiSServiceResolver *r,
777
676
AvahiIfIndex interface,
778
AvahiProtocol proto,
677
AVAHI_GCC_UNUSED AvahiProtocol protocol,
779
678
AvahiResolverEvent event,
780
679
const char *name,
781
680
const char *type,
786
685
AVAHI_GCC_UNUSED AvahiStringList *txt,
787
686
AVAHI_GCC_UNUSED AvahiLookupResultFlags
788
687
flags,
789
__attribute__((unused)) void* userdata){
790
assert(r);
688
void* userdata) {
689
mandos_context *mc = userdata;
690
assert(r); /* Spurious warning */
791
691
792
692
/* Called whenever a service has been resolved successfully or
793
693
timed out */
794
694
795
switch(event){
695
switch (event) {
796
696
default:
797
697
case AVAHI_RESOLVER_FAILURE:
798
698
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
799
699
" of type '%s' in domain '%s': %s\n", name, type, domain,
800
avahi_strerror(avahi_server_errno(mc.server)));
700
avahi_strerror(avahi_server_errno(mc->server)));
801
701
break;
802
702
803
703
case AVAHI_RESOLVER_FOUND:
805
705
char ip[AVAHI_ADDRESS_STR_MAX];
806
706
avahi_address_snprint(ip, sizeof(ip), address);
807
707
if(debug){
808
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
809
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
810
ip, (intmax_t)interface, port);
708
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
709
" port %d\n", name, host_name, ip, interface, port);
811
710
}
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);
711
int ret = start_mandos_communication(ip, port, interface, mc);
712
if (ret == 0){
713
exit(EXIT_SUCCESS);
816
714
}
817
715
}
818
716
}
819
717
avahi_s_service_resolver_free(r);
820
718
}
821
719
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);
720
static void browse_callback( AvahiSServiceBrowser *b,
721
AvahiIfIndex interface,
722
AvahiProtocol protocol,
723
AvahiBrowserEvent event,
724
const char *name,
725
const char *type,
726
const char *domain,
727
AVAHI_GCC_UNUSED AvahiLookupResultFlags
728
flags,
729
void* userdata) {
730
mandos_context *mc = userdata;
731
assert(b); /* Spurious warning */
833
732
834
733
/* Called whenever a new services becomes available on the LAN or
835
734
is removed from the LAN */
836
735
837
switch(event){
736
switch (event) {
838
737
default:
839
738
case AVAHI_BROWSER_FAILURE:
840
739
841
740
fprintf(stderr, "(Avahi browser) %s\n",
842
avahi_strerror(avahi_server_errno(mc.server)));
843
avahi_simple_poll_quit(mc.simple_poll);
741
avahi_strerror(avahi_server_errno(mc->server)));
742
avahi_simple_poll_quit(mc->simple_poll);
844
743
return;
845
744
846
745
case AVAHI_BROWSER_NEW:
849
748
the callback function is called the Avahi server will free the
850
749
resolver for us. */
851
750
852
if(!(avahi_s_service_resolver_new(mc.server, interface,
751
if (!(avahi_s_service_resolver_new(mc->server, interface,
853
752
protocol, name, type, domain,
854
753
AVAHI_PROTO_INET6, 0,
855
resolve_callback, NULL)))
754
resolve_callback, mc)))
856
755
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
857
name, avahi_strerror(avahi_server_errno(mc.server)));
756
name, avahi_strerror(avahi_server_errno(mc->server)));
858
757
break;
859
758
860
759
case AVAHI_BROWSER_REMOVE:
869
768
}
870
769
}
871
770
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;
771
/* Combines file name and path and returns the malloced new
772
string. some sane checks could/should be added */
773
static const char *combinepath(const char *first, const char *second){
774
size_t f_len = strlen(first);
775
size_t s_len = strlen(second);
776
char *tmp = malloc(f_len + s_len + 2);
777
if (tmp == NULL){
778
return NULL;
779
}
780
if(f_len > 0){
781
memcpy(tmp, first, f_len); /* Spurious warning */
782
}
783
tmp[f_len] = '/';
784
if(s_len > 0){
785
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
786
}
787
tmp[f_len + 1 + s_len] = '\0';
788
return tmp;
876
789
}
877
790
791
878
792
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");
1052
exitcode = EXIT_FAILURE;
1053
#ifdef __linux__
1054
if(restore_loglevel){
1055
ret = klogctl(7, NULL, 0);
1056
if(ret == -1){
1057
perror("klogctl");
793
AvahiSServiceBrowser *sb = NULL;
794
int error;
795
int ret;
796
int exitcode = EXIT_SUCCESS;
797
const char *interface = "eth0";
798
struct ifreq network;
799
int sd;
800
uid_t uid;
801
gid_t gid;
802
char *connect_to = NULL;
803
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
804
const char *pubkeyfile = "pubkey.txt";
805
const char *seckeyfile = "seckey.txt";
806
mandos_context mc = { .simple_poll = NULL, .server = NULL,
807
.dh_bits = 1024, .priority = "SECURE256"};
808
bool gnutls_initalized = false;
809
810
{
811
struct argp_option options[] = {
812
{ .name = "debug", .key = 128,
813
.doc = "Debug mode", .group = 3 },
814
{ .name = "connect", .key = 'c',
815
.arg = "IP",
816
.doc = "Connect directly to a sepcified mandos server",
817
.group = 1 },
818
{ .name = "interface", .key = 'i',
819
.arg = "INTERFACE",
820
.doc = "Interface that Avahi will conntect through",
821
.group = 1 },
822
{ .name = "keydir", .key = 'd',
823
.arg = "KEYDIR",
824
.doc = "Directory where the openpgp keyring is",
825
.group = 1 },
826
{ .name = "seckey", .key = 's',
827
.arg = "SECKEY",
828
.doc = "Secret openpgp key for gnutls authentication",
829
.group = 1 },
830
{ .name = "pubkey", .key = 'p',
831
.arg = "PUBKEY",
832
.doc = "Public openpgp key for gnutls authentication",
833
.group = 2 },
834
{ .name = "dh-bits", .key = 129,
835
.arg = "BITS",
836
.doc = "dh-bits to use in gnutls communication",
837
.group = 2 },
838
{ .name = "priority", .key = 130,
839
.arg = "PRIORITY",
840
.doc = "GNUTLS priority", .group = 1 },
841
{ .name = NULL }
842
};
843
844
845
error_t parse_opt (int key, char *arg,
846
struct argp_state *state) {
847
/* Get the INPUT argument from `argp_parse', which we know is
848
a pointer to our plugin list pointer. */
849
switch (key) {
850
case 128:
851
debug = true;
852
break;
853
case 'c':
854
connect_to = arg;
855
break;
856
case 'i':
857
interface = arg;
858
break;
859
case 'd':
860
keydir = arg;
861
break;
862
case 's':
863
seckeyfile = arg;
864
break;
865
case 'p':
866
pubkeyfile = arg;
867
break;
868
case 129:
869
errno = 0;
870
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
871
if (errno){
872
perror("strtol");
873
exit(EXIT_FAILURE);
1058
874
}
875
break;
876
case 130:
877
mc.priority = arg;
878
break;
879
case ARGP_KEY_ARG:
880
argp_usage (state);
881
break;
882
case ARGP_KEY_END:
883
break;
884
default:
885
return ARGP_ERR_UNKNOWN;
1059
886
}
1060
#endif
1061
goto end;
1062
}
1063
}
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'){
887
return 0;
888
}
889
890
struct argp argp = { .options = options, .parser = parse_opt,
891
.args_doc = "",
892
.doc = "Mandos client -- Get and decrypt"
893
" passwords from mandos server" };
894
argp_parse (&argp, argc, argv, 0, 0, NULL);
895
}
896
897
pubkeyfile = combinepath(keydir, pubkeyfile);
898
if (pubkeyfile == NULL){
899
perror("combinepath");
900
exitcode = EXIT_FAILURE;
901
goto end;
902
}
903
904
seckeyfile = combinepath(keydir, seckeyfile);
905
if (seckeyfile == NULL){
906
perror("combinepath");
907
goto end;
908
}
909
910
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
911
if (ret == -1){
912
fprintf(stderr, "init_gnutls_global\n");
913
goto end;
914
} else {
915
gnutls_initalized = true;
916
}
917
918
uid = getuid();
919
gid = getgid();
920
921
ret = setuid(uid);
922
if (ret == -1){
923
perror("setuid");
924
}
925
926
setgid(gid);
927
if (ret == -1){
928
perror("setgid");
929
}
930
1131
931
if_index = (AvahiIfIndex) if_nametoindex(interface);
1132
932
if(if_index == 0){
1133
933
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
934
exit(EXIT_FAILURE);
935
}
936
937
if(connect_to != NULL){
938
/* Connect directly, do not use Zeroconf */
939
/* (Mainly meant for debugging) */
940
char *address = strrchr(connect_to, ':');
941
if(address == NULL){
942
fprintf(stderr, "No colon in address\n");
943
exitcode = EXIT_FAILURE;
944
goto end;
945
}
946
errno = 0;
947
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
948
if(errno){
949
perror("Bad port number");
950
exitcode = EXIT_FAILURE;
951
goto end;
952
}
953
*address = '\0';
954
address = connect_to;
955
ret = start_mandos_communication(address, port, if_index, &mc);
956
if(ret < 0){
957
exitcode = EXIT_FAILURE;
958
} else {
959
exitcode = EXIT_SUCCESS;
960
}
961
goto end;
962
}
963
964
/* If the interface is down, bring it up */
965
{
966
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
967
if(sd < 0) {
968
perror("socket");
969
exitcode = EXIT_FAILURE;
970
goto end;
971
}
972
strcpy(network.ifr_name, interface); /* Spurious warning */
973
ret = ioctl(sd, SIOCGIFFLAGS, &network);
974
if(ret == -1){
975
perror("ioctl SIOCGIFFLAGS");
976
exitcode = EXIT_FAILURE;
977
goto end;
978
}
979
if((network.ifr_flags & IFF_UP) == 0){
980
network.ifr_flags |= IFF_UP;
981
ret = ioctl(sd, SIOCSIFFLAGS, &network);
982
if(ret == -1){
983
perror("ioctl SIOCSIFFLAGS");
984
exitcode = EXIT_FAILURE;
985
goto end;
986
}
987
}
988
close(sd);
989
}
990
991
if (not debug){
992
avahi_set_log_function(empty_log);
993
}
994
995
/* Initialize the pseudo-RNG for Avahi */
996
srand((unsigned int) time(NULL));
997
998
/* Allocate main Avahi loop object */
999
mc.simple_poll = avahi_simple_poll_new();
1000
if (mc.simple_poll == NULL) {
1001
fprintf(stderr, "Avahi: Failed to create simple poll"
1002
" object.\n");
1003
exitcode = EXIT_FAILURE;
1004
goto end;
1005
}
1006
1007
{
1008
AvahiServerConfig config;
1009
/* Do not publish any local Zeroconf records */
1010
avahi_server_config_init(&config);
1011
config.publish_hinfo = 0;
1012
config.publish_addresses = 0;
1013
config.publish_workstation = 0;
1014
config.publish_domain = 0;
1015
1016
/* Allocate a new server */
1017
mc.server = avahi_server_new(avahi_simple_poll_get
1018
(mc.simple_poll), &config, NULL,
1019
NULL, &error);
1020
1021
/* Free the Avahi configuration data */
1022
avahi_server_config_free(&config);
1023
}
1024
1025
/* Check if creating the Avahi server object succeeded */
1026
if (mc.server == NULL) {
1027
fprintf(stderr, "Failed to create Avahi server: %s\n",
1028
avahi_strerror(error));
1029
exitcode = EXIT_FAILURE;
1030
goto end;
1031
}
1032
1033
/* Create the Avahi service browser */
1034
sb = avahi_s_service_browser_new(mc.server, if_index,
1035
AVAHI_PROTO_INET6,
1036
"_mandos._tcp", NULL, 0,
1037
browse_callback, &mc);
1038
if (sb == NULL) {
1039
fprintf(stderr, "Failed to create service browser: %s\n",
1040
avahi_strerror(avahi_server_errno(mc.server)));
1041
exitcode = EXIT_FAILURE;
1042
goto end;
1043
}
1044
1045
/* Run the main loop */
1046
1047
if (debug){
1048
fprintf(stderr, "Starting Avahi loop search\n");
1049
}
1050
1051
avahi_simple_poll_loop(mc.simple_poll);
1052
1250
1053
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;
1054
1055
if (debug){
1056
fprintf(stderr, "%s exiting\n", argv[0]);
1057
}
1058
1059
/* Cleanup things */
1060
if (sb != NULL)
1061
avahi_s_service_browser_free(sb);
1062
1063
if (mc.server != NULL)
1064
avahi_server_free(mc.server);
1065
1066
if (mc.simple_poll != NULL)
1067
avahi_simple_poll_free(mc.simple_poll);
1068
free(pubkeyfile);
1069
free(seckeyfile);
1070
1071
if (gnutls_initalized){
1072
gnutls_certificate_free_credentials (mc.cred);
1073
gnutls_global_deinit ();
1074
}
1075
1076
return exitcode;
1321
1077
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0