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- Committer: Teddy Hogeborn
- Date: 2009-02-03 22:41:49 UTC
- Revision ID: teddy@fukt.bsnet.se-20090203224149-fc1301jojmusbzlx
* Makefile (run-server): Use "--no-dbus" unconditionally.
* initramfs-tools-script: Correct tests for writable "/conf/conf.d".
* mandos: Add process ID number to logging messages.
(IPv6_TCPServer.server_bind): Use plain "raise".
(main): Do not try to handle SIGSEGV; it does not work. Use plain
"raise". Log KeyboardInterrupt and server exit.
* initramfs-tools-script: Correct tests for writable "/conf/conf.d".
* mandos: Add process ID number to logging messages.
(IPv6_TCPServer.server_bind): Use plain "raise".
(main): Do not try to handle SIGSEGV; it does not work. Use plain
"raise". Log KeyboardInterrupt and server exit.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- plugins.d/usplash
- files renamed:
- 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
35
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
36
37
37
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
38
stdout, ferror() */
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,
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
#include <time.h> /* time() */
64
#include <time.h> /* nanosleep(), 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,
70
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <sys/klog.h> /* klogctl() */
71
79
72
80
/* Avahi */
73
81
/* All Avahi types, constants and functions
86
94
gnutls_*
87
95
init_gnutls_session(),
88
96
GNUTLS_* */
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
97
#include <gnutls/openpgp.h>
98
/* gnutls_certificate_set_openpgp_key_file(),
90
99
GNUTLS_OPENPGP_FMT_BASE64 */
91
100
92
101
/* GPGME */
98
107
99
108
#define BUFFER_SIZE 256
100
109
110
#define PATHDIR "/conf/conf.d/mandos"
111
#define SECKEY "seckey.txt"
112
#define PUBKEY "pubkey.txt"
113
101
114
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
115
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
116
const char *argp_program_version = "mandos-client " VERSION;
105
117
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
106
118
107
119
/* Used for passing in values through the Avahi callback functions */
112
124
unsigned int dh_bits;
113
125
gnutls_dh_params_t dh_params;
114
126
const char *priority;
127
gpgme_ctx_t ctx;
115
128
} mandos_context;
116
129
117
130
/*
121
134
*/
122
135
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
136
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
137
if(buffer_length + BUFFER_SIZE > buffer_capacity){
125
138
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
126
if (buffer == NULL){
139
if(buffer == NULL){
127
140
return 0;
128
141
}
129
142
buffer_capacity += BUFFER_SIZE;
132
145
}
133
146
134
147
/*
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
148
* Initialize GPGME.
137
149
*/
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
size_t crypto_size,
140
char **plaintext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
143
gpgme_ctx_t ctx;
150
static bool init_gpgme(mandos_context *mc, const char *seckey,
151
const char *pubkey, const char *tempdir){
152
int ret;
144
153
gpgme_error_t rc;
145
ssize_t ret;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
154
gpgme_engine_info_t engine_info;
149
155
150
if (debug){
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
156
157
/*
158
* Helper function to insert pub and seckey to the engine keyring.
159
*/
160
bool import_key(const char *filename){
161
int fd;
162
gpgme_data_t pgp_data;
163
164
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
165
if(fd == -1){
166
perror("open");
167
return false;
168
}
169
170
rc = gpgme_data_new_from_fd(&pgp_data, fd);
171
if(rc != GPG_ERR_NO_ERROR){
172
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
173
gpgme_strsource(rc), gpgme_strerror(rc));
174
return false;
175
}
176
177
rc = gpgme_op_import(mc->ctx, pgp_data);
178
if(rc != GPG_ERR_NO_ERROR){
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
180
gpgme_strsource(rc), gpgme_strerror(rc));
181
return false;
182
}
183
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
185
if(ret == -1){
186
perror("close");
187
}
188
gpgme_data_release(pgp_data);
189
return true;
190
}
191
192
if(debug){
193
fprintf(stderr, "Initialize gpgme\n");
152
194
}
153
195
154
196
/* Init GPGME */
155
197
gpgme_check_version(NULL);
156
198
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
199
if(rc != GPG_ERR_NO_ERROR){
158
200
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
201
gpgme_strsource(rc), gpgme_strerror(rc));
160
return -1;
202
return false;
161
203
}
162
204
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
205
/* Set GPGME home directory for the OpenPGP engine only */
206
rc = gpgme_get_engine_info(&engine_info);
207
if(rc != GPG_ERR_NO_ERROR){
166
208
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
209
gpgme_strsource(rc), gpgme_strerror(rc));
168
return -1;
210
return false;
169
211
}
170
212
while(engine_info != NULL){
171
213
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
214
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
215
engine_info->file_name, tempdir);
174
216
break;
175
217
}
176
218
engine_info = engine_info->next;
177
219
}
178
220
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
180
return -1;
221
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
222
return false;
223
}
224
225
/* Create new GPGME "context" */
226
rc = gpgme_new(&(mc->ctx));
227
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
230
return false;
231
}
232
233
if(not import_key(pubkey) or not import_key(seckey)){
234
return false;
235
}
236
237
return true;
238
}
239
240
/*
241
* Decrypt OpenPGP data.
242
* Returns -1 on error
243
*/
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
246
size_t crypto_size,
247
char **plaintext){
248
gpgme_data_t dh_crypto, dh_plain;
249
gpgme_error_t rc;
250
ssize_t ret;
251
size_t plaintext_capacity = 0;
252
ssize_t plaintext_length = 0;
253
254
if(debug){
255
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
181
256
}
182
257
183
258
/* Create new GPGME data buffer from memory cryptotext */
184
259
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
185
260
0);
186
if (rc != GPG_ERR_NO_ERROR){
261
if(rc != GPG_ERR_NO_ERROR){
187
262
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
263
gpgme_strsource(rc), gpgme_strerror(rc));
189
264
return -1;
191
266
192
267
/* Create new empty GPGME data buffer for the plaintext */
193
268
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
269
if(rc != GPG_ERR_NO_ERROR){
195
270
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
271
gpgme_strsource(rc), gpgme_strerror(rc));
197
272
gpgme_data_release(dh_crypto);
198
273
return -1;
199
274
}
200
275
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
207
goto decrypt_end;
208
}
209
210
276
/* Decrypt data from the cryptotext data buffer to the plaintext
211
277
data buffer */
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
278
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
279
if(rc != GPG_ERR_NO_ERROR){
214
280
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
281
gpgme_strsource(rc), gpgme_strerror(rc));
216
282
plaintext_length = -1;
217
if (debug){
283
if(debug){
218
284
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
220
if (result == NULL){
285
result = gpgme_op_decrypt_result(mc->ctx);
286
if(result == NULL){
221
287
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
222
288
} else {
223
289
fprintf(stderr, "Unsupported algorithm: %s\n",
250
316
}
251
317
252
318
/* Seek back to the beginning of the GPGME plaintext data buffer */
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
254
perror("pgpme_data_seek");
319
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
320
perror("gpgme_data_seek");
255
321
plaintext_length = -1;
256
322
goto decrypt_end;
257
323
}
261
327
plaintext_capacity = adjustbuffer(plaintext,
262
328
(size_t)plaintext_length,
263
329
plaintext_capacity);
264
if (plaintext_capacity == 0){
330
if(plaintext_capacity == 0){
265
331
perror("adjustbuffer");
266
332
plaintext_length = -1;
267
333
goto decrypt_end;
270
336
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
271
337
BUFFER_SIZE);
272
338
/* Print the data, if any */
273
if (ret == 0){
339
if(ret == 0){
274
340
/* EOF */
275
341
break;
276
342
}
281
347
}
282
348
plaintext_length += ret;
283
349
}
284
350
285
351
if(debug){
286
352
fprintf(stderr, "Decrypted password is: ");
287
353
for(ssize_t i = 0; i < plaintext_length; i++){
300
366
return plaintext_length;
301
367
}
302
368
303
static const char * safer_gnutls_strerror (int value) {
304
const char *ret = gnutls_strerror (value); /* Spurious warning */
305
if (ret == NULL)
369
static const char * safer_gnutls_strerror(int value) {
370
const char *ret = gnutls_strerror(value); /* Spurious warning from
371
-Wunreachable-code */
372
if(ret == NULL)
306
373
ret = "(unknown)";
307
374
return ret;
308
375
}
323
390
}
324
391
325
392
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
393
if(ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "GnuTLS global_init: %s\n",
395
safer_gnutls_strerror(ret));
329
396
return -1;
330
397
}
331
398
332
if (debug){
399
if(debug){
333
400
/* "Use a log level over 10 to enable all debugging options."
334
401
* - GnuTLS manual
335
402
*/
339
406
340
407
/* OpenPGP credentials */
341
408
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
warning */
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
411
* from
412
* -Wunreachable-code
413
*/
414
safer_gnutls_strerror(ret));
415
gnutls_global_deinit();
347
416
return -1;
348
417
}
349
418
350
419
if(debug){
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
420
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
421
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
353
422
seckeyfilename);
354
423
}
355
424
356
425
ret = gnutls_certificate_set_openpgp_key_file
357
426
(mc->cred, pubkeyfilename, seckeyfilename,
358
427
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
428
if(ret != GNUTLS_E_SUCCESS) {
360
429
fprintf(stderr,
361
430
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
431
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
432
fprintf(stderr, "The GnuTLS error is: %s\n",
364
433
safer_gnutls_strerror(ret));
365
434
goto globalfail;
366
435
}
367
436
368
437
/* GnuTLS server initialization */
369
438
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
439
if(ret != GNUTLS_E_SUCCESS) {
440
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
441
" %s\n", safer_gnutls_strerror(ret));
373
442
goto globalfail;
374
443
}
375
444
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
445
if(ret != GNUTLS_E_SUCCESS) {
446
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
447
safer_gnutls_strerror(ret));
379
448
goto globalfail;
380
449
}
381
450
382
451
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
383
452
384
453
return 0;
385
454
386
455
globalfail:
387
456
388
457
gnutls_certificate_free_credentials(mc->cred);
389
458
gnutls_global_deinit();
459
gnutls_dh_params_deinit(mc->dh_params);
390
460
return -1;
391
392
461
}
393
462
394
463
static int init_gnutls_session(mandos_context *mc,
396
465
int ret;
397
466
/* GnuTLS session creation */
398
467
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
468
if(ret != GNUTLS_E_SUCCESS){
400
469
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
470
safer_gnutls_strerror(ret));
402
471
}
404
473
{
405
474
const char *err;
406
475
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
476
if(ret != GNUTLS_E_SUCCESS) {
408
477
fprintf(stderr, "Syntax error at: %s\n", err);
409
478
fprintf(stderr, "GnuTLS error: %s\n",
410
479
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
480
gnutls_deinit(*session);
412
481
return -1;
413
482
}
414
483
}
415
484
416
485
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
417
486
mc->cred);
418
if (ret != GNUTLS_E_SUCCESS) {
487
if(ret != GNUTLS_E_SUCCESS) {
419
488
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
489
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
490
gnutls_deinit(*session);
422
491
return -1;
423
492
}
424
493
425
494
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
427
GNUTLS_CERT_IGNORE);
495
gnutls_certificate_server_set_request(*session,
496
GNUTLS_CERT_IGNORE);
428
497
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
430
499
431
500
return 0;
432
501
}
440
509
AvahiIfIndex if_index,
441
510
mandos_context *mc){
442
511
int ret, tcp_sd;
512
ssize_t sret;
443
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
444
514
char *buffer = NULL;
445
515
char *decrypted_buffer;
451
521
char interface[IF_NAMESIZE];
452
522
gnutls_session_t session;
453
523
454
ret = init_gnutls_session (mc, &session);
455
if (ret != 0){
524
ret = init_gnutls_session(mc, &session);
525
if(ret != 0){
456
526
return -1;
457
527
}
458
528
466
536
perror("socket");
467
537
return -1;
468
538
}
469
539
470
540
if(debug){
471
541
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
542
perror("if_indextoname");
480
550
/* It would be nice to have a way to detect if we were passed an
481
551
IPv4 address here. Now we assume an IPv6 address. */
482
552
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
483
if (ret < 0 ){
553
if(ret < 0 ){
484
554
perror("inet_pton");
485
555
return -1;
486
556
}
488
558
fprintf(stderr, "Bad address: %s\n", ip);
489
559
return -1;
490
560
}
491
to.in6.sin6_port = htons(port); /* Spurious warning */
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wconversion and
563
-Wunreachable-code */
492
564
493
565
to.in6.sin6_scope_id = (uint32_t)if_index;
494
566
507
579
}
508
580
509
581
ret = connect(tcp_sd, &to.in, sizeof(to));
510
if (ret < 0){
582
if(ret < 0){
511
583
perror("connect");
512
584
return -1;
513
585
}
514
586
515
587
const char *out = mandos_protocol_version;
516
588
written = 0;
517
while (true){
589
while(true){
518
590
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
592
out_size - written));
521
if (ret == -1){
593
if(ret == -1){
522
594
perror("write");
523
595
retval = -1;
524
596
goto mandos_end;
527
599
if(written < out_size){
528
600
continue;
529
601
} else {
530
if (out == mandos_protocol_version){
602
if(out == mandos_protocol_version){
531
603
written = 0;
532
604
out = "\r\n";
533
605
} else {
535
607
}
536
608
}
537
609
}
538
610
539
611
if(debug){
540
612
fprintf(stderr, "Establishing TLS session with %s\n", ip);
541
613
}
542
614
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
544
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
616
545
617
do{
546
ret = gnutls_handshake (session);
618
ret = gnutls_handshake(session);
547
619
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
548
620
549
if (ret != GNUTLS_E_SUCCESS){
621
if(ret != GNUTLS_E_SUCCESS){
550
622
if(debug){
551
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
552
gnutls_perror (ret);
624
gnutls_perror(ret);
553
625
}
554
626
retval = -1;
555
627
goto mandos_end;
561
633
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
562
634
ip);
563
635
}
564
636
565
637
while(true){
566
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
639
buffer_capacity);
568
if (buffer_capacity == 0){
640
if(buffer_capacity == 0){
569
641
perror("adjustbuffer");
570
642
retval = -1;
571
643
goto mandos_end;
572
644
}
573
645
574
ret = gnutls_record_recv(session, buffer+buffer_length,
575
BUFFER_SIZE);
576
if (ret == 0){
646
sret = gnutls_record_recv(session, buffer+buffer_length,
647
BUFFER_SIZE);
648
if(sret == 0){
577
649
break;
578
650
}
579
if (ret < 0){
580
switch(ret){
651
if(sret < 0){
652
switch(sret){
581
653
case GNUTLS_E_INTERRUPTED:
582
654
case GNUTLS_E_AGAIN:
583
655
break;
584
656
case GNUTLS_E_REHANDSHAKE:
585
657
do{
586
ret = gnutls_handshake (session);
658
ret = gnutls_handshake(session);
587
659
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
588
if (ret < 0){
660
if(ret < 0){
589
661
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
590
gnutls_perror (ret);
662
gnutls_perror(ret);
591
663
retval = -1;
592
664
goto mandos_end;
593
665
}
596
668
fprintf(stderr, "Unknown error while reading data from"
597
669
" encrypted session with Mandos server\n");
598
670
retval = -1;
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
600
672
goto mandos_end;
601
673
}
602
674
} else {
603
buffer_length += (size_t) ret;
675
buffer_length += (size_t) sret;
604
676
}
605
677
}
606
678
608
680
fprintf(stderr, "Closing TLS session\n");
609
681
}
610
682
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
612
684
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
685
if(buffer_length > 0){
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
615
687
buffer_length,
616
&decrypted_buffer,
617
keydir);
618
if (decrypted_buffer_size >= 0){
688
&decrypted_buffer);
689
if(decrypted_buffer_size >= 0){
619
690
written = 0;
620
691
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
623
stdout);
692
ret = (int)fwrite(decrypted_buffer + written, 1,
693
(size_t)decrypted_buffer_size - written,
694
stdout);
624
695
if(ret == 0 and ferror(stdout)){
625
696
if(debug){
626
697
fprintf(stderr, "Error writing encrypted data: %s\n",
643
714
644
715
mandos_end:
645
716
free(buffer);
646
close(tcp_sd);
647
gnutls_deinit (session);
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
718
if(ret == -1){
719
perror("close");
720
}
721
gnutls_deinit(session);
648
722
return retval;
649
723
}
650
724
668
742
/* Called whenever a service has been resolved successfully or
669
743
timed out */
670
744
671
switch (event) {
745
switch(event) {
672
746
default:
673
747
case AVAHI_RESOLVER_FAILURE:
674
748
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
682
756
avahi_address_snprint(ip, sizeof(ip), address);
683
757
if(debug){
684
758
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
686
interface, port);
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
760
ip, (intmax_t)interface, port);
687
761
}
688
762
int ret = start_mandos_communication(ip, port, interface, mc);
689
if (ret == 0){
763
if(ret == 0){
690
764
avahi_simple_poll_quit(mc->simple_poll);
691
765
}
692
766
}
710
784
/* Called whenever a new services becomes available on the LAN or
711
785
is removed from the LAN */
712
786
713
switch (event) {
787
switch(event) {
714
788
default:
715
789
case AVAHI_BROWSER_FAILURE:
716
790
725
799
the callback function is called the Avahi server will free the
726
800
resolver for us. */
727
801
728
if (!(avahi_s_service_resolver_new(mc->server, interface,
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
729
803
protocol, name, type, domain,
730
804
AVAHI_PROTO_INET6, 0,
731
805
resolve_callback, mc)))
745
819
}
746
820
}
747
821
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
751
char *tmp;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
753
if(ret < 0){
754
return NULL;
755
}
756
return tmp;
757
}
758
759
760
822
int main(int argc, char *argv[]){
761
823
AvahiSServiceBrowser *sb = NULL;
762
824
int error;
763
825
int ret;
826
intmax_t tmpmax;
827
int numchars;
764
828
int exitcode = EXIT_SUCCESS;
765
829
const char *interface = "eth0";
766
830
struct ifreq network;
768
832
uid_t uid;
769
833
gid_t gid;
770
834
char *connect_to = NULL;
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
771
837
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
838
const char *seckey = PATHDIR "/" SECKEY;
839
const char *pubkey = PATHDIR "/" PUBKEY;
840
776
841
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
842
.dh_bits = 1024, .priority = "SECURE256"
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
846
double delay = 2.5;
779
847
780
848
{
781
849
struct argp_option options[] = {
782
850
{ .name = "debug", .key = 128,
783
851
.doc = "Debug mode", .group = 3 },
784
852
{ .name = "connect", .key = 'c',
785
.arg = "IP",
786
.doc = "Connect directly to a sepcified mandos server",
853
.arg = "ADDRESS:PORT",
854
.doc = "Connect directly to a specific Mandos server",
787
855
.group = 1 },
788
856
{ .name = "interface", .key = 'i',
789
.arg = "INTERFACE",
790
.doc = "Interface that Avahi will conntect through",
791
.group = 1 },
792
{ .name = "keydir", .key = 'd',
793
.arg = "KEYDIR",
794
.doc = "Directory where the openpgp keyring is",
857
.arg = "NAME",
858
.doc = "Interface that will be used to search for Mandos"
859
" servers",
795
860
.group = 1 },
796
861
{ .name = "seckey", .key = 's',
797
.arg = "SECKEY",
798
.doc = "Secret openpgp key for gnutls authentication",
862
.arg = "FILE",
863
.doc = "OpenPGP secret key file base name",
799
864
.group = 1 },
800
865
{ .name = "pubkey", .key = 'p',
801
.arg = "PUBKEY",
802
.doc = "Public openpgp key for gnutls authentication",
866
.arg = "FILE",
867
.doc = "OpenPGP public key file base name",
803
868
.group = 2 },
804
869
{ .name = "dh-bits", .key = 129,
805
870
.arg = "BITS",
806
.doc = "dh-bits to use in gnutls communication",
871
.doc = "Bit length of the prime number used in the"
872
" Diffie-Hellman key exchange",
807
873
.group = 2 },
808
874
{ .name = "priority", .key = 130,
809
.arg = "PRIORITY",
810
.doc = "GNUTLS priority", .group = 1 },
875
.arg = "STRING",
876
.doc = "GnuTLS priority string for the TLS handshake",
877
.group = 1 },
878
{ .name = "delay", .key = 131,
879
.arg = "SECONDS",
880
.doc = "Maximum delay to wait for interface startup",
881
.group = 2 },
811
882
{ .name = NULL }
812
883
};
813
814
884
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
819
switch (key) {
820
case 128:
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
887
switch(key) {
888
case 128: /* --debug */
821
889
debug = true;
822
890
break;
823
case 'c':
891
case 'c': /* --connect */
824
892
connect_to = arg;
825
893
break;
826
case 'i':
894
case 'i': /* --interface */
827
895
interface = arg;
828
896
break;
829
case 'd':
830
keydir = arg;
831
break;
832
case 's':
833
seckeyname = arg;
834
break;
835
case 'p':
836
pubkeyname = arg;
837
break;
838
case 129:
839
errno = 0;
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
841
if (errno){
842
perror("strtol");
897
case 's': /* --seckey */
898
seckey = arg;
899
break;
900
case 'p': /* --pubkey */
901
pubkey = arg;
902
break;
903
case 129: /* --dh-bits */
904
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
905
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
906
or arg[numchars] != '\0'){
907
fprintf(stderr, "Bad number of DH bits\n");
843
908
exit(EXIT_FAILURE);
844
909
}
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
845
911
break;
846
case 130:
912
case 130: /* --priority */
847
913
mc.priority = arg;
848
914
break;
915
case 131: /* --delay */
916
ret = sscanf(arg, "%lf%n", &delay, &numchars);
917
if(ret < 1 or arg[numchars] != '\0'){
918
fprintf(stderr, "Bad delay\n");
919
exit(EXIT_FAILURE);
920
}
921
break;
849
922
case ARGP_KEY_ARG:
850
argp_usage (state);
923
argp_usage(state);
851
924
case ARGP_KEY_END:
852
925
break;
853
926
default:
855
928
}
856
929
return 0;
857
930
}
858
931
859
932
struct argp argp = { .options = options, .parser = parse_opt,
860
933
.args_doc = "",
861
934
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
935
" passwords from a Mandos server" };
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
865
938
fprintf(stderr, "Unknown error while parsing arguments\n");
866
939
exitcode = EXIT_FAILURE;
867
940
goto end;
868
941
}
869
942
}
870
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
875
goto end;
876
}
877
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
882
goto end;
883
}
884
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
if (ret == -1){
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
889
goto end;
890
} else {
891
gnutls_initalized = true;
892
}
893
943
894
944
/* If the interface is down, bring it up */
895
945
{
946
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
947
messages to mess up the prompt */
948
ret = klogctl(8, NULL, 5);
949
if(ret == -1){
950
perror("klogctl");
951
}
952
896
953
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
954
if(sd < 0) {
898
955
perror("socket");
899
956
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
958
if(ret == -1){
959
perror("klogctl");
960
}
900
961
goto end;
901
962
}
902
963
strcpy(network.ifr_name, interface);
903
964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
904
965
if(ret == -1){
905
966
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
968
if(ret == -1){
969
perror("klogctl");
970
}
906
971
exitcode = EXIT_FAILURE;
907
972
goto end;
908
973
}
912
977
if(ret == -1){
913
978
perror("ioctl SIOCSIFFLAGS");
914
979
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
981
if(ret == -1){
982
perror("klogctl");
983
}
915
984
goto end;
916
985
}
917
986
}
918
close(sd);
987
/* sleep checking until interface is running */
988
for(int i=0; i < delay * 4; i++){
989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
990
if(ret == -1){
991
perror("ioctl SIOCGIFFLAGS");
992
} else if(network.ifr_flags & IFF_RUNNING){
993
break;
994
}
995
struct timespec sleeptime = { .tv_nsec = 250000000 };
996
nanosleep(&sleeptime, NULL);
997
}
998
ret = (int)TEMP_FAILURE_RETRY(close(sd));
999
if(ret == -1){
1000
perror("close");
1001
}
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1004
if(ret == -1){
1005
perror("klogctl");
1006
}
919
1007
}
920
1008
921
1009
uid = getuid();
922
1010
gid = getgid();
923
1011
1012
setgid(gid);
1013
if(ret == -1){
1014
perror("setgid");
1015
}
1016
924
1017
ret = setuid(uid);
925
if (ret == -1){
1018
if(ret == -1){
926
1019
perror("setuid");
927
1020
}
928
1021
929
setgid(gid);
930
if (ret == -1){
931
perror("setgid");
1022
ret = init_gnutls_global(&mc, pubkey, seckey);
1023
if(ret == -1){
1024
fprintf(stderr, "init_gnutls_global failed\n");
1025
exitcode = EXIT_FAILURE;
1026
goto end;
1027
} else {
1028
gnutls_initialized = true;
1029
}
1030
1031
if(mkdtemp(tempdir) == NULL){
1032
perror("mkdtemp");
1033
goto end;
1034
}
1035
tempdir_created = true;
1036
1037
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1038
fprintf(stderr, "init_gpgme failed\n");
1039
exitcode = EXIT_FAILURE;
1040
goto end;
1041
} else {
1042
gpgme_initialized = true;
932
1043
}
933
1044
934
1045
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
1046
if(if_index == 0){
936
1047
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
exit(EXIT_FAILURE);
1048
exitcode = EXIT_FAILURE;
1049
goto end;
938
1050
}
939
1051
940
1052
if(connect_to != NULL){
946
1058
exitcode = EXIT_FAILURE;
947
1059
goto end;
948
1060
}
949
errno = 0;
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
if(errno){
952
perror("Bad port number");
1061
uint16_t port;
1062
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1063
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1064
or address[numchars+1] != '\0'){
1065
fprintf(stderr, "Bad port number\n");
953
1066
exitcode = EXIT_FAILURE;
954
1067
goto end;
955
1068
}
1069
port = (uint16_t)tmpmax;
956
1070
*address = '\0';
957
1071
address = connect_to;
958
1072
ret = start_mandos_communication(address, port, if_index, &mc);
964
1078
goto end;
965
1079
}
966
1080
967
if (not debug){
1081
if(not debug){
968
1082
avahi_set_log_function(empty_log);
969
1083
}
970
1084
973
1087
974
1088
/* Allocate main Avahi loop object */
975
1089
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
1090
if(mc.simple_poll == NULL) {
977
1091
fprintf(stderr, "Avahi: Failed to create simple poll"
978
1092
" object.\n");
979
1093
exitcode = EXIT_FAILURE;
980
1094
goto end;
981
1095
}
982
1096
983
1097
{
984
1098
AvahiServerConfig config;
985
1099
/* Do not publish any local Zeroconf records */
988
1102
config.publish_addresses = 0;
989
1103
config.publish_workstation = 0;
990
1104
config.publish_domain = 0;
991
1105
992
1106
/* Allocate a new server */
993
1107
mc.server = avahi_server_new(avahi_simple_poll_get
994
1108
(mc.simple_poll), &config, NULL,
995
1109
NULL, &error);
996
1110
997
1111
/* Free the Avahi configuration data */
998
1112
avahi_server_config_free(&config);
999
1113
}
1000
1114
1001
1115
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1116
if(mc.server == NULL) {
1003
1117
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
1118
avahi_strerror(error));
1005
1119
exitcode = EXIT_FAILURE;
1011
1125
AVAHI_PROTO_INET6,
1012
1126
"_mandos._tcp", NULL, 0,
1013
1127
browse_callback, &mc);
1014
if (sb == NULL) {
1128
if(sb == NULL) {
1015
1129
fprintf(stderr, "Failed to create service browser: %s\n",
1016
1130
avahi_strerror(avahi_server_errno(mc.server)));
1017
1131
exitcode = EXIT_FAILURE;
1019
1133
}
1020
1134
1021
1135
/* Run the main loop */
1022
1023
if (debug){
1136
1137
if(debug){
1024
1138
fprintf(stderr, "Starting Avahi loop search\n");
1025
1139
}
1026
1140
1027
1141
avahi_simple_poll_loop(mc.simple_poll);
1028
1142
1029
1143
end:
1030
1031
if (debug){
1144
1145
if(debug){
1032
1146
fprintf(stderr, "%s exiting\n", argv[0]);
1033
1147
}
1034
1148
1035
1149
/* Cleanup things */
1036
if (sb != NULL)
1150
if(sb != NULL)
1037
1151
avahi_s_service_browser_free(sb);
1038
1152
1039
if (mc.server != NULL)
1153
if(mc.server != NULL)
1040
1154
avahi_server_free(mc.server);
1041
1042
if (mc.simple_poll != NULL)
1155
1156
if(mc.simple_poll != NULL)
1043
1157
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1046
1047
if (gnutls_initalized){
1158
1159
if(gnutls_initialized){
1048
1160
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1163
}
1164
1165
if(gpgme_initialized){
1166
gpgme_release(mc.ctx);
1167
}
1168
1169
/* Removes the temp directory used by GPGME */
1170
if(tempdir_created){
1171
DIR *d;
1172
struct dirent *direntry;
1173
d = opendir(tempdir);
1174
if(d == NULL){
1175
if(errno != ENOENT){
1176
perror("opendir");
1177
}
1178
} else {
1179
while(true){
1180
direntry = readdir(d);
1181
if(direntry == NULL){
1182
break;
1183
}
1184
/* Skip "." and ".." */
1185
if(direntry->d_name[0] == '.'
1186
and (direntry->d_name[1] == '\0'
1187
or (direntry->d_name[1] == '.'
1188
and direntry->d_name[2] == '\0'))){
1189
continue;
1190
}
1191
char *fullname = NULL;
1192
ret = asprintf(&fullname, "%s/%s", tempdir,
1193
direntry->d_name);
1194
if(ret < 0){
1195
perror("asprintf");
1196
continue;
1197
}
1198
ret = remove(fullname);
1199
if(ret == -1){
1200
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1201
strerror(errno));
1202
}
1203
free(fullname);
1204
}
1205
closedir(d);
1206
}
1207
ret = rmdir(tempdir);
1208
if(ret == -1 and errno != ENOENT){
1209
perror("rmdir");
1210
}
1050
1211
}
1051
1212
1052
1213
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0