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- Committer: Teddy Hogeborn
- Date: 2009-01-29 22:22:32 UTC
- Revision ID: teddy@fukt.bsnet.se-20090129222232-p9hqnq338nsvxayp
* mandos (main): Bug fix: Do setgid before setuid. Add verbose GnuTLS
debugging messages.
* plugins.d/mandos-client.c (main): Bug fix: Do setgid before setuid.
debugging messages.
* plugins.d/mandos-client.c (main): Bug fix: Do setgid before setuid.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- network-protocol.txt
- files renamed:
- mandos-client.c => plugin-runner.c
- mandos-client.xml => plugin-runner.xml
- plugins.d/password-request.c => plugins.d/mandos-client.c
- plugins.d/password-request.xml => plugins.d/mandos-client.xml
- files modified:
- Makefile
added
removed
plugins.d/mandos-client.c
1
1
/* -*- coding: utf-8 -*- */
2
2
/*
3
* Mandos client - get and decrypt data from a Mandos server
3
* Mandos-client - get and decrypt data from a Mandos server
4
4
*
5
5
* This program is partly derived from an example program for an Avahi
6
6
* service browser, downloaded from
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
13
14
*
14
15
* This program is free software: you can redistribute it and/or
15
16
* modify it under the terms of the GNU General Public License as
32
33
#define _LARGEFILE_SOURCE
33
34
#define _FILE_OFFSET_BITS 64
34
35
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
38
ferror() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
40
remove() */
39
41
#include <stdint.h> /* uint16_t, uint32_t */
40
42
#include <stddef.h> /* NULL, size_t, ssize_t */
41
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
42
44
srand() */
43
45
#include <stdbool.h> /* bool, true */
44
46
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
47
strerror(), asprintf(), strcpy() */
46
48
#include <sys/ioctl.h> /* ioctl */
47
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
50
sockaddr_in6, PF_INET6,
49
51
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t */
51
#include <inttypes.h> /* PRIu16 */
52
uid_t, gid_t, open(), opendir(),
53
DIR */
54
#include <sys/stat.h> /* open() */
52
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
56
struct in6_addr, inet_pton(),
54
57
connect() */
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
55
62
#include <assert.h> /* assert() */
56
63
#include <errno.h> /* perror(), errno */
57
64
#include <time.h> /* time() */
58
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
66
SIOCSIFFLAGS, if_indextoname(),
60
67
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
61
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
70
getuid(), getgid(), setuid(),
63
71
setgid() */
64
#include <netinet/in.h>
65
72
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, and, or */
67
74
#include <argp.h> /* struct argp_option, error_t, struct
68
75
argp_state, struct argp,
69
76
argp_parse(), ARGP_KEY_ARG,
81
88
#include <avahi-common/error.h>
82
89
83
90
/* GnuTLS */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
91
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
92
functions:
85
93
gnutls_*
86
94
init_gnutls_session(),
87
95
GNUTLS_* */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
96
#include <gnutls/openpgp.h>
97
/* gnutls_certificate_set_openpgp_key_file(),
89
98
GNUTLS_OPENPGP_FMT_BASE64 */
90
99
91
100
/* GPGME */
92
#include <gpgme.h> /* All GPGME types, constants and functions
101
#include <gpgme.h> /* All GPGME types, constants and
102
functions:
93
103
gpgme_*
94
104
GPGME_PROTOCOL_OpenPGP,
95
105
GPG_ERR_NO_* */
96
106
97
107
#define BUFFER_SIZE 256
98
108
109
#define PATHDIR "/conf/conf.d/mandos"
110
#define SECKEY "seckey.txt"
111
#define PUBKEY "pubkey.txt"
112
99
113
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
101
114
static const char mandos_protocol_version[] = "1";
102
const char *argp_program_version = "password-request 1.0";
115
const char *argp_program_version = "mandos-client " VERSION;
103
116
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
104
117
105
118
/* Used for passing in values through the Avahi callback functions */
110
123
unsigned int dh_bits;
111
124
gnutls_dh_params_t dh_params;
112
125
const char *priority;
126
gpgme_ctx_t ctx;
113
127
} mandos_context;
114
128
115
129
/*
119
133
*/
120
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
135
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
123
137
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
124
if (buffer == NULL){
138
if(buffer == NULL){
125
139
return 0;
126
140
}
127
141
buffer_capacity += BUFFER_SIZE;
130
144
}
131
145
132
146
/*
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
147
* Initialize GPGME.
135
148
*/
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
137
size_t crypto_size,
138
char **plaintext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
141
gpgme_ctx_t ctx;
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
const char *pubkey, const char *tempdir){
151
int ret;
142
152
gpgme_error_t rc;
143
ssize_t ret;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
146
153
gpgme_engine_info_t engine_info;
147
154
148
if (debug){
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
155
156
/*
157
* Helper function to insert pub and seckey to the engine keyring.
158
*/
159
bool import_key(const char *filename){
160
int fd;
161
gpgme_data_t pgp_data;
162
163
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
164
if(fd == -1){
165
perror("open");
166
return false;
167
}
168
169
rc = gpgme_data_new_from_fd(&pgp_data, fd);
170
if(rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
173
return false;
174
}
175
176
rc = gpgme_op_import(mc->ctx, pgp_data);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
return false;
181
}
182
183
ret = (int)TEMP_FAILURE_RETRY(close(fd));
184
if(ret == -1){
185
perror("close");
186
}
187
gpgme_data_release(pgp_data);
188
return true;
189
}
190
191
if(debug){
192
fprintf(stderr, "Initialize gpgme\n");
150
193
}
151
194
152
195
/* Init GPGME */
153
196
gpgme_check_version(NULL);
154
197
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
155
if (rc != GPG_ERR_NO_ERROR){
198
if(rc != GPG_ERR_NO_ERROR){
156
199
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
157
200
gpgme_strsource(rc), gpgme_strerror(rc));
158
return -1;
201
return false;
159
202
}
160
203
161
/* Set GPGME home directory for the OpenPGP engine only */
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
204
/* Set GPGME home directory for the OpenPGP engine only */
205
rc = gpgme_get_engine_info(&engine_info);
206
if(rc != GPG_ERR_NO_ERROR){
164
207
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
165
208
gpgme_strsource(rc), gpgme_strerror(rc));
166
return -1;
209
return false;
167
210
}
168
211
while(engine_info != NULL){
169
212
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
170
213
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
171
engine_info->file_name, homedir);
214
engine_info->file_name, tempdir);
172
215
break;
173
216
}
174
217
engine_info = engine_info->next;
175
218
}
176
219
if(engine_info == NULL){
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
178
return -1;
220
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
221
return false;
222
}
223
224
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
226
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
229
return false;
230
}
231
232
if(not import_key(pubkey) or not import_key(seckey)){
233
return false;
234
}
235
236
return true;
237
}
238
239
/*
240
* Decrypt OpenPGP data.
241
* Returns -1 on error
242
*/
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
245
size_t crypto_size,
246
char **plaintext){
247
gpgme_data_t dh_crypto, dh_plain;
248
gpgme_error_t rc;
249
ssize_t ret;
250
size_t plaintext_capacity = 0;
251
ssize_t plaintext_length = 0;
252
253
if(debug){
254
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
255
}
180
256
181
257
/* Create new GPGME data buffer from memory cryptotext */
182
258
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
183
259
0);
184
if (rc != GPG_ERR_NO_ERROR){
260
if(rc != GPG_ERR_NO_ERROR){
185
261
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
262
gpgme_strsource(rc), gpgme_strerror(rc));
187
263
return -1;
189
265
190
266
/* Create new empty GPGME data buffer for the plaintext */
191
267
rc = gpgme_data_new(&dh_plain);
192
if (rc != GPG_ERR_NO_ERROR){
268
if(rc != GPG_ERR_NO_ERROR){
193
269
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
270
gpgme_strsource(rc), gpgme_strerror(rc));
195
271
gpgme_data_release(dh_crypto);
196
272
return -1;
197
273
}
198
274
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
205
goto decrypt_end;
206
}
207
208
275
/* Decrypt data from the cryptotext data buffer to the plaintext
209
276
data buffer */
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
278
if(rc != GPG_ERR_NO_ERROR){
212
279
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
280
gpgme_strsource(rc), gpgme_strerror(rc));
214
281
plaintext_length = -1;
282
if(debug){
283
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
285
if(result == NULL){
286
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
} else {
288
fprintf(stderr, "Unsupported algorithm: %s\n",
289
result->unsupported_algorithm);
290
fprintf(stderr, "Wrong key usage: %u\n",
291
result->wrong_key_usage);
292
if(result->file_name != NULL){
293
fprintf(stderr, "File name: %s\n", result->file_name);
294
}
295
gpgme_recipient_t recipient;
296
recipient = result->recipients;
297
if(recipient){
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
304
? "No" : "Yes");
305
recipient = recipient->next;
306
}
307
}
308
}
309
}
215
310
goto decrypt_end;
216
311
}
217
312
219
314
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
220
315
}
221
316
222
if (debug){
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
225
if (result == NULL){
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
227
} else {
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
234
}
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
237
if(recipient){
238
while(recipient != NULL){
239
fprintf(stderr, "Public key algorithm: %s\n",
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
243
recipient->status == GPG_ERR_NO_SECKEY
244
? "No" : "Yes");
245
recipient = recipient->next;
246
}
247
}
248
}
249
}
250
251
317
/* Seek back to the beginning of the GPGME plaintext data buffer */
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
318
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
319
perror("gpgme_data_seek");
254
320
plaintext_length = -1;
255
321
goto decrypt_end;
256
322
}
260
326
plaintext_capacity = adjustbuffer(plaintext,
261
327
(size_t)plaintext_length,
262
328
plaintext_capacity);
263
if (plaintext_capacity == 0){
329
if(plaintext_capacity == 0){
264
330
perror("adjustbuffer");
265
331
plaintext_length = -1;
266
332
goto decrypt_end;
269
335
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
270
336
BUFFER_SIZE);
271
337
/* Print the data, if any */
272
if (ret == 0){
338
if(ret == 0){
273
339
/* EOF */
274
340
break;
275
341
}
280
346
}
281
347
plaintext_length += ret;
282
348
}
283
349
284
350
if(debug){
285
351
fprintf(stderr, "Decrypted password is: ");
286
352
for(ssize_t i = 0; i < plaintext_length; i++){
299
365
return plaintext_length;
300
366
}
301
367
302
static const char * safer_gnutls_strerror (int value) {
303
const char *ret = gnutls_strerror (value);
304
if (ret == NULL)
368
static const char * safer_gnutls_strerror(int value) {
369
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
-Wunreachable-code */
371
if(ret == NULL)
305
372
ret = "(unknown)";
306
373
return ret;
307
374
}
313
380
}
314
381
315
382
static int init_gnutls_global(mandos_context *mc,
316
const char *pubkeyfile,
317
const char *seckeyfile){
383
const char *pubkeyfilename,
384
const char *seckeyfilename){
318
385
int ret;
319
386
320
387
if(debug){
322
389
}
323
390
324
391
ret = gnutls_global_init();
325
if (ret != GNUTLS_E_SUCCESS) {
326
fprintf (stderr, "GnuTLS global_init: %s\n",
327
safer_gnutls_strerror(ret));
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
328
395
return -1;
329
396
}
330
397
331
if (debug){
398
if(debug){
332
399
/* "Use a log level over 10 to enable all debugging options."
333
400
* - GnuTLS manual
334
401
*/
338
405
339
406
/* OpenPGP credentials */
340
407
gnutls_certificate_allocate_credentials(&mc->cred);
341
if (ret != GNUTLS_E_SUCCESS){
342
fprintf (stderr, "GnuTLS memory error: %s\n",
343
safer_gnutls_strerror(ret));
344
gnutls_global_deinit ();
408
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
410
* from
411
* -Wunreachable-code
412
*/
413
safer_gnutls_strerror(ret));
414
gnutls_global_deinit();
345
415
return -1;
346
416
}
347
417
348
418
if(debug){
349
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
350
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
seckeyfile);
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
421
seckeyfilename);
352
422
}
353
423
354
424
ret = gnutls_certificate_set_openpgp_key_file
355
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
356
if (ret != GNUTLS_E_SUCCESS) {
425
(mc->cred, pubkeyfilename, seckeyfilename,
426
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
357
428
fprintf(stderr,
358
429
"Error[%d] while reading the OpenPGP key pair ('%s',"
359
" '%s')\n", ret, pubkeyfile, seckeyfile);
360
fprintf(stdout, "The GnuTLS error is: %s\n",
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
361
432
safer_gnutls_strerror(ret));
362
433
goto globalfail;
363
434
}
364
435
365
436
/* GnuTLS server initialization */
366
437
ret = gnutls_dh_params_init(&mc->dh_params);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
369
" %s\n", safer_gnutls_strerror(ret));
438
if(ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
" %s\n", safer_gnutls_strerror(ret));
370
441
goto globalfail;
371
442
}
372
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
373
if (ret != GNUTLS_E_SUCCESS) {
374
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
375
safer_gnutls_strerror(ret));
444
if(ret != GNUTLS_E_SUCCESS) {
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
safer_gnutls_strerror(ret));
376
447
goto globalfail;
377
448
}
378
449
379
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
380
451
381
452
return 0;
382
453
383
454
globalfail:
384
455
385
456
gnutls_certificate_free_credentials(mc->cred);
386
457
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
387
459
return -1;
388
389
460
}
390
461
391
462
static int init_gnutls_session(mandos_context *mc,
393
464
int ret;
394
465
/* GnuTLS session creation */
395
466
ret = gnutls_init(session, GNUTLS_SERVER);
396
if (ret != GNUTLS_E_SUCCESS){
467
if(ret != GNUTLS_E_SUCCESS){
397
468
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
398
469
safer_gnutls_strerror(ret));
399
470
}
401
472
{
402
473
const char *err;
403
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
404
if (ret != GNUTLS_E_SUCCESS) {
475
if(ret != GNUTLS_E_SUCCESS) {
405
476
fprintf(stderr, "Syntax error at: %s\n", err);
406
477
fprintf(stderr, "GnuTLS error: %s\n",
407
478
safer_gnutls_strerror(ret));
408
gnutls_deinit (*session);
479
gnutls_deinit(*session);
409
480
return -1;
410
481
}
411
482
}
412
483
413
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
414
485
mc->cred);
415
if (ret != GNUTLS_E_SUCCESS) {
486
if(ret != GNUTLS_E_SUCCESS) {
416
487
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
417
488
safer_gnutls_strerror(ret));
418
gnutls_deinit (*session);
489
gnutls_deinit(*session);
419
490
return -1;
420
491
}
421
492
422
493
/* ignore client certificate if any. */
423
gnutls_certificate_server_set_request (*session,
424
GNUTLS_CERT_IGNORE);
494
gnutls_certificate_server_set_request(*session,
495
GNUTLS_CERT_IGNORE);
425
496
426
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
427
498
428
499
return 0;
429
500
}
437
508
AvahiIfIndex if_index,
438
509
mandos_context *mc){
439
510
int ret, tcp_sd;
511
ssize_t sret;
440
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
441
513
char *buffer = NULL;
442
514
char *decrypted_buffer;
448
520
char interface[IF_NAMESIZE];
449
521
gnutls_session_t session;
450
522
451
ret = init_gnutls_session (mc, &session);
452
if (ret != 0){
523
ret = init_gnutls_session(mc, &session);
524
if(ret != 0){
453
525
return -1;
454
526
}
455
527
463
535
perror("socket");
464
536
return -1;
465
537
}
466
538
467
539
if(debug){
468
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
541
perror("if_indextoname");
472
544
fprintf(stderr, "Binding to interface %s\n", interface);
473
545
}
474
546
475
memset(&to,0,sizeof(to)); /* Spurious warning */
547
memset(&to, 0, sizeof(to));
476
548
to.in6.sin6_family = AF_INET6;
477
549
/* It would be nice to have a way to detect if we were passed an
478
550
IPv4 address here. Now we assume an IPv6 address. */
479
551
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
480
if (ret < 0 ){
552
if(ret < 0 ){
481
553
perror("inet_pton");
482
554
return -1;
483
555
}
485
557
fprintf(stderr, "Bad address: %s\n", ip);
486
558
return -1;
487
559
}
488
to.in6.sin6_port = htons(port); /* Spurious warning */
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
561
-Wconversion and
562
-Wunreachable-code */
489
563
490
564
to.in6.sin6_scope_id = (uint32_t)if_index;
491
565
504
578
}
505
579
506
580
ret = connect(tcp_sd, &to.in, sizeof(to));
507
if (ret < 0){
581
if(ret < 0){
508
582
perror("connect");
509
583
return -1;
510
584
}
511
585
512
586
const char *out = mandos_protocol_version;
513
587
written = 0;
514
while (true){
588
while(true){
515
589
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
591
out_size - written));
518
if (ret == -1){
592
if(ret == -1){
519
593
perror("write");
520
594
retval = -1;
521
595
goto mandos_end;
524
598
if(written < out_size){
525
599
continue;
526
600
} else {
527
if (out == mandos_protocol_version){
601
if(out == mandos_protocol_version){
528
602
written = 0;
529
603
out = "\r\n";
530
604
} else {
532
606
}
533
607
}
534
608
}
535
609
536
610
if(debug){
537
611
fprintf(stderr, "Establishing TLS session with %s\n", ip);
538
612
}
539
613
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
541
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
615
542
616
do{
543
ret = gnutls_handshake (session);
617
ret = gnutls_handshake(session);
544
618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
545
619
546
if (ret != GNUTLS_E_SUCCESS){
620
if(ret != GNUTLS_E_SUCCESS){
547
621
if(debug){
548
622
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
549
gnutls_perror (ret);
623
gnutls_perror(ret);
550
624
}
551
625
retval = -1;
552
626
goto mandos_end;
558
632
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
559
633
ip);
560
634
}
561
635
562
636
while(true){
563
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
564
638
buffer_capacity);
565
if (buffer_capacity == 0){
639
if(buffer_capacity == 0){
566
640
perror("adjustbuffer");
567
641
retval = -1;
568
642
goto mandos_end;
569
643
}
570
644
571
ret = gnutls_record_recv(session, buffer+buffer_length,
572
BUFFER_SIZE);
573
if (ret == 0){
645
sret = gnutls_record_recv(session, buffer+buffer_length,
646
BUFFER_SIZE);
647
if(sret == 0){
574
648
break;
575
649
}
576
if (ret < 0){
577
switch(ret){
650
if(sret < 0){
651
switch(sret){
578
652
case GNUTLS_E_INTERRUPTED:
579
653
case GNUTLS_E_AGAIN:
580
654
break;
581
655
case GNUTLS_E_REHANDSHAKE:
582
656
do{
583
ret = gnutls_handshake (session);
657
ret = gnutls_handshake(session);
584
658
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
585
if (ret < 0){
659
if(ret < 0){
586
660
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
587
gnutls_perror (ret);
661
gnutls_perror(ret);
588
662
retval = -1;
589
663
goto mandos_end;
590
664
}
593
667
fprintf(stderr, "Unknown error while reading data from"
594
668
" encrypted session with Mandos server\n");
595
669
retval = -1;
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
597
671
goto mandos_end;
598
672
}
599
673
} else {
600
buffer_length += (size_t) ret;
674
buffer_length += (size_t) sret;
601
675
}
602
676
}
603
677
605
679
fprintf(stderr, "Closing TLS session\n");
606
680
}
607
681
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
609
683
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
612
686
buffer_length,
613
&decrypted_buffer,
614
keydir);
615
if (decrypted_buffer_size >= 0){
687
&decrypted_buffer);
688
if(decrypted_buffer_size >= 0){
616
689
written = 0;
617
690
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
620
stdout);
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
693
stdout);
621
694
if(ret == 0 and ferror(stdout)){
622
695
if(debug){
623
696
fprintf(stderr, "Error writing encrypted data: %s\n",
632
705
} else {
633
706
retval = -1;
634
707
}
708
} else {
709
retval = -1;
635
710
}
636
711
637
712
/* Shutdown procedure */
638
713
639
714
mandos_end:
640
715
free(buffer);
641
close(tcp_sd);
642
gnutls_deinit (session);
716
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
717
if(ret == -1){
718
perror("close");
719
}
720
gnutls_deinit(session);
643
721
return retval;
644
722
}
645
723
658
736
flags,
659
737
void* userdata) {
660
738
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
739
assert(r);
662
740
663
741
/* Called whenever a service has been resolved successfully or
664
742
timed out */
665
743
666
switch (event) {
744
switch(event) {
667
745
default:
668
746
case AVAHI_RESOLVER_FAILURE:
669
747
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
677
755
avahi_address_snprint(ip, sizeof(ip), address);
678
756
if(debug){
679
757
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
680
PRIu16 ") on port %d\n", name, host_name, ip,
681
interface, port);
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
ip, (intmax_t)interface, port);
682
760
}
683
761
int ret = start_mandos_communication(ip, port, interface, mc);
684
if (ret == 0){
685
exit(EXIT_SUCCESS);
762
if(ret == 0){
763
avahi_simple_poll_quit(mc->simple_poll);
686
764
}
687
765
}
688
766
}
700
778
flags,
701
779
void* userdata) {
702
780
mandos_context *mc = userdata;
703
assert(b); /* Spurious warning */
781
assert(b);
704
782
705
783
/* Called whenever a new services becomes available on the LAN or
706
784
is removed from the LAN */
707
785
708
switch (event) {
786
switch(event) {
709
787
default:
710
788
case AVAHI_BROWSER_FAILURE:
711
789
720
798
the callback function is called the Avahi server will free the
721
799
resolver for us. */
722
800
723
if (!(avahi_s_service_resolver_new(mc->server, interface,
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
724
802
protocol, name, type, domain,
725
803
AVAHI_PROTO_INET6, 0,
726
804
resolve_callback, mc)))
740
818
}
741
819
}
742
820
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
749
if (tmp == NULL){
750
return NULL;
751
}
752
if(f_len > 0){
753
memcpy(tmp, first, f_len); /* Spurious warning */
754
}
755
tmp[f_len] = '/';
756
if(s_len > 0){
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
}
759
tmp[f_len + 1 + s_len] = '\0';
760
return tmp;
761
}
762
763
764
821
int main(int argc, char *argv[]){
765
822
AvahiSServiceBrowser *sb = NULL;
766
823
int error;
767
824
int ret;
825
intmax_t tmpmax;
826
int numchars;
768
827
int exitcode = EXIT_SUCCESS;
769
828
const char *interface = "eth0";
770
829
struct ifreq network;
772
831
uid_t uid;
773
832
gid_t gid;
774
833
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
bool tempdir_created = false;
775
836
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
837
const char *seckey = PATHDIR "/" SECKEY;
838
const char *pubkey = PATHDIR "/" PUBKEY;
839
778
840
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
841
.dh_bits = 1024, .priority = "SECURE256"
842
":!CTYPE-X.509:+CTYPE-OPENPGP" };
843
bool gnutls_initialized = false;
844
bool gpgme_initialized = false;
781
845
782
846
{
783
847
struct argp_option options[] = {
784
848
{ .name = "debug", .key = 128,
785
849
.doc = "Debug mode", .group = 3 },
786
850
{ .name = "connect", .key = 'c',
787
.arg = "IP",
788
.doc = "Connect directly to a sepcified mandos server",
851
.arg = "ADDRESS:PORT",
852
.doc = "Connect directly to a specific Mandos server",
789
853
.group = 1 },
790
854
{ .name = "interface", .key = 'i',
791
.arg = "INTERFACE",
792
.doc = "Interface that Avahi will conntect through",
793
.group = 1 },
794
{ .name = "keydir", .key = 'd',
795
.arg = "KEYDIR",
796
.doc = "Directory where the openpgp keyring is",
855
.arg = "NAME",
856
.doc = "Interface that will be used to search for Mandos"
857
" servers",
797
858
.group = 1 },
798
859
{ .name = "seckey", .key = 's',
799
.arg = "SECKEY",
800
.doc = "Secret openpgp key for gnutls authentication",
860
.arg = "FILE",
861
.doc = "OpenPGP secret key file base name",
801
862
.group = 1 },
802
863
{ .name = "pubkey", .key = 'p',
803
.arg = "PUBKEY",
804
.doc = "Public openpgp key for gnutls authentication",
864
.arg = "FILE",
865
.doc = "OpenPGP public key file base name",
805
866
.group = 2 },
806
867
{ .name = "dh-bits", .key = 129,
807
868
.arg = "BITS",
808
.doc = "dh-bits to use in gnutls communication",
869
.doc = "Bit length of the prime number used in the"
870
" Diffie-Hellman key exchange",
809
871
.group = 2 },
810
872
{ .name = "priority", .key = 130,
811
.arg = "PRIORITY",
812
.doc = "GNUTLS priority", .group = 1 },
873
.arg = "STRING",
874
.doc = "GnuTLS priority string for the TLS handshake",
875
.group = 1 },
813
876
{ .name = NULL }
814
877
};
815
816
878
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
821
switch (key) {
822
case 128:
879
error_t parse_opt(int key, char *arg,
880
struct argp_state *state) {
881
switch(key) {
882
case 128: /* --debug */
823
883
debug = true;
824
884
break;
825
case 'c':
885
case 'c': /* --connect */
826
886
connect_to = arg;
827
887
break;
828
case 'i':
888
case 'i': /* --interface */
829
889
interface = arg;
830
890
break;
831
case 'd':
832
keydir = arg;
833
break;
834
case 's':
835
seckeyfile = arg;
836
break;
837
case 'p':
838
pubkeyfile = arg;
839
break;
840
case 129:
841
errno = 0;
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
843
if (errno){
844
perror("strtol");
891
case 's': /* --seckey */
892
seckey = arg;
893
break;
894
case 'p': /* --pubkey */
895
pubkey = arg;
896
break;
897
case 129: /* --dh-bits */
898
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
899
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
900
or arg[numchars] != '\0'){
901
fprintf(stderr, "Bad number of DH bits\n");
845
902
exit(EXIT_FAILURE);
846
903
}
904
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
847
905
break;
848
case 130:
906
case 130: /* --priority */
849
907
mc.priority = arg;
850
908
break;
851
909
case ARGP_KEY_ARG:
852
argp_usage (state);
910
argp_usage(state);
911
case ARGP_KEY_END:
853
912
break;
854
case ARGP_KEY_END:
855
break;
856
913
default:
857
914
return ARGP_ERR_UNKNOWN;
858
915
}
859
916
return 0;
860
917
}
861
918
862
919
struct argp argp = { .options = options, .parser = parse_opt,
863
920
.args_doc = "",
864
921
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
922
" passwords from a Mandos server" };
923
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
924
if(ret == ARGP_ERR_UNKNOWN){
868
925
fprintf(stderr, "Unknown error while parsing arguments\n");
869
926
exitcode = EXIT_FAILURE;
870
927
goto end;
871
928
}
872
929
}
873
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
878
goto end;
879
}
880
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
885
goto end;
886
}
887
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
if (ret == -1){
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
892
goto end;
893
} else {
894
gnutls_initalized = true;
895
}
896
930
897
931
/* If the interface is down, bring it up */
898
932
{
902
936
exitcode = EXIT_FAILURE;
903
937
goto end;
904
938
}
905
strcpy(network.ifr_name, interface); /* Spurious warning */
939
strcpy(network.ifr_name, interface);
906
940
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
941
if(ret == -1){
908
942
perror("ioctl SIOCGIFFLAGS");
918
952
goto end;
919
953
}
920
954
}
921
close(sd);
955
ret = (int)TEMP_FAILURE_RETRY(close(sd));
956
if(ret == -1){
957
perror("close");
958
}
922
959
}
923
960
924
961
uid = getuid();
925
962
gid = getgid();
926
963
964
setgid(gid);
965
if(ret == -1){
966
perror("setgid");
967
}
968
927
969
ret = setuid(uid);
928
if (ret == -1){
970
if(ret == -1){
929
971
perror("setuid");
930
972
}
931
973
932
setgid(gid);
933
if (ret == -1){
934
perror("setgid");
974
ret = init_gnutls_global(&mc, pubkey, seckey);
975
if(ret == -1){
976
fprintf(stderr, "init_gnutls_global failed\n");
977
exitcode = EXIT_FAILURE;
978
goto end;
979
} else {
980
gnutls_initialized = true;
981
}
982
983
if(mkdtemp(tempdir) == NULL){
984
perror("mkdtemp");
985
goto end;
986
}
987
tempdir_created = true;
988
989
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
990
fprintf(stderr, "init_gpgme failed\n");
991
exitcode = EXIT_FAILURE;
992
goto end;
993
} else {
994
gpgme_initialized = true;
935
995
}
936
996
937
997
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
998
if(if_index == 0){
939
999
fprintf(stderr, "No such interface: \"%s\"\n", interface);
940
exit(EXIT_FAILURE);
1000
exitcode = EXIT_FAILURE;
1001
goto end;
941
1002
}
942
1003
943
1004
if(connect_to != NULL){
949
1010
exitcode = EXIT_FAILURE;
950
1011
goto end;
951
1012
}
952
errno = 0;
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
if(errno){
955
perror("Bad port number");
1013
uint16_t port;
1014
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1015
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1016
or address[numchars+1] != '\0'){
1017
fprintf(stderr, "Bad port number\n");
956
1018
exitcode = EXIT_FAILURE;
957
1019
goto end;
958
1020
}
1021
port = (uint16_t)tmpmax;
959
1022
*address = '\0';
960
1023
address = connect_to;
961
1024
ret = start_mandos_communication(address, port, if_index, &mc);
967
1030
goto end;
968
1031
}
969
1032
970
if (not debug){
1033
if(not debug){
971
1034
avahi_set_log_function(empty_log);
972
1035
}
973
1036
976
1039
977
1040
/* Allocate main Avahi loop object */
978
1041
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
1042
if(mc.simple_poll == NULL) {
980
1043
fprintf(stderr, "Avahi: Failed to create simple poll"
981
1044
" object.\n");
982
1045
exitcode = EXIT_FAILURE;
983
1046
goto end;
984
1047
}
985
1048
986
1049
{
987
1050
AvahiServerConfig config;
988
1051
/* Do not publish any local Zeroconf records */
991
1054
config.publish_addresses = 0;
992
1055
config.publish_workstation = 0;
993
1056
config.publish_domain = 0;
994
1057
995
1058
/* Allocate a new server */
996
1059
mc.server = avahi_server_new(avahi_simple_poll_get
997
1060
(mc.simple_poll), &config, NULL,
998
1061
NULL, &error);
999
1062
1000
1063
/* Free the Avahi configuration data */
1001
1064
avahi_server_config_free(&config);
1002
1065
}
1003
1066
1004
1067
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1068
if(mc.server == NULL) {
1006
1069
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
1070
avahi_strerror(error));
1008
1071
exitcode = EXIT_FAILURE;
1014
1077
AVAHI_PROTO_INET6,
1015
1078
"_mandos._tcp", NULL, 0,
1016
1079
browse_callback, &mc);
1017
if (sb == NULL) {
1080
if(sb == NULL) {
1018
1081
fprintf(stderr, "Failed to create service browser: %s\n",
1019
1082
avahi_strerror(avahi_server_errno(mc.server)));
1020
1083
exitcode = EXIT_FAILURE;
1022
1085
}
1023
1086
1024
1087
/* Run the main loop */
1025
1026
if (debug){
1088
1089
if(debug){
1027
1090
fprintf(stderr, "Starting Avahi loop search\n");
1028
1091
}
1029
1092
1030
1093
avahi_simple_poll_loop(mc.simple_poll);
1031
1094
1032
1095
end:
1033
1034
if (debug){
1096
1097
if(debug){
1035
1098
fprintf(stderr, "%s exiting\n", argv[0]);
1036
1099
}
1037
1100
1038
1101
/* Cleanup things */
1039
if (sb != NULL)
1102
if(sb != NULL)
1040
1103
avahi_s_service_browser_free(sb);
1041
1104
1042
if (mc.server != NULL)
1105
if(mc.server != NULL)
1043
1106
avahi_server_free(mc.server);
1044
1045
if (mc.simple_poll != NULL)
1107
1108
if(mc.simple_poll != NULL)
1046
1109
avahi_simple_poll_free(mc.simple_poll);
1047
free(pubkeyfile);
1048
free(seckeyfile);
1049
1050
if (gnutls_initalized){
1110
1111
if(gnutls_initialized){
1051
1112
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();
1113
gnutls_global_deinit();
1114
gnutls_dh_params_deinit(mc.dh_params);
1115
}
1116
1117
if(gpgme_initialized){
1118
gpgme_release(mc.ctx);
1119
}
1120
1121
/* Removes the temp directory used by GPGME */
1122
if(tempdir_created){
1123
DIR *d;
1124
struct dirent *direntry;
1125
d = opendir(tempdir);
1126
if(d == NULL){
1127
if(errno != ENOENT){
1128
perror("opendir");
1129
}
1130
} else {
1131
while(true){
1132
direntry = readdir(d);
1133
if(direntry == NULL){
1134
break;
1135
}
1136
/* Skip "." and ".." */
1137
if(direntry->d_name[0] == '.'
1138
and (direntry->d_name[1] == '\0'
1139
or (direntry->d_name[1] == '.'
1140
and direntry->d_name[2] == '\0'))){
1141
continue;
1142
}
1143
char *fullname = NULL;
1144
ret = asprintf(&fullname, "%s/%s", tempdir,
1145
direntry->d_name);
1146
if(ret < 0){
1147
perror("asprintf");
1148
continue;
1149
}
1150
ret = remove(fullname);
1151
if(ret == -1){
1152
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1153
strerror(errno));
1154
}
1155
free(fullname);
1156
}
1157
closedir(d);
1158
}
1159
ret = rmdir(tempdir);
1160
if(ret == -1 and errno != ENOENT){
1161
perror("rmdir");
1162
}
1053
1163
}
1054
1164
1055
1165
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0