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- Committer: Teddy Hogeborn
- Date: 2009-02-03 22:41:49 UTC
- mto: (24.1.131 mandos) (237.4.2 mandos-pipe-ipc) (299.1.1 release) (300.1.1 release) (301.1.1 release)
- mto: This revision was merged to the branch mainline in revision 250.
- 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:
- .bzrignore
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, open(), opendir(), DIR */
52
uid_t, gid_t, open(), opendir(),
53
DIR */
51
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() */
55
58
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
60
*/
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
58
62
#include <assert.h> /* assert() */
59
63
#include <errno.h> /* perror(), errno */
60
#include <time.h> /* time() */
64
#include <time.h> /* nanosleep(), time() */
61
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
66
SIOCSIFFLAGS, if_indextoname(),
63
67
if_nametoindex(), IF_NAMESIZE */
66
70
getuid(), getgid(), setuid(),
67
71
setgid() */
68
72
#include <arpa/inet.h> /* inet_pton(), htons */
69
#include <iso646.h> /* not, and */
73
#include <iso646.h> /* not, and, or */
70
74
#include <argp.h> /* struct argp_option, error_t, struct
71
75
argp_state, struct argp,
72
76
argp_parse(), ARGP_KEY_ARG,
73
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <sys/klog.h> /* klogctl() */
74
79
75
80
/* Avahi */
76
81
/* All Avahi types, constants and functions
89
94
gnutls_*
90
95
init_gnutls_session(),
91
96
GNUTLS_* */
92
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
97
#include <gnutls/openpgp.h>
98
/* gnutls_certificate_set_openpgp_key_file(),
93
99
GNUTLS_OPENPGP_FMT_BASE64 */
94
100
95
101
/* GPGME */
101
107
102
108
#define BUFFER_SIZE 256
103
109
104
/*
105
#define PATHDIR "/conf/conf.d/mandos"
106
*/
107
108
110
#define PATHDIR "/conf/conf.d/mandos"
109
111
#define SECKEY "seckey.txt"
110
#define PUBKEY "pupkey.txt"
112
#define PUBKEY "pubkey.txt"
111
113
112
114
bool debug = false;
113
115
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "password-request 1.0";
116
const char *argp_program_version = "mandos-client " VERSION;
115
117
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
116
118
117
119
/* Used for passing in values through the Avahi callback functions */
132
134
*/
133
135
size_t adjustbuffer(char **buffer, size_t buffer_length,
134
136
size_t buffer_capacity){
135
if (buffer_length + BUFFER_SIZE > buffer_capacity){
137
if(buffer_length + BUFFER_SIZE > buffer_capacity){
136
138
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
137
if (buffer == NULL){
139
if(buffer == NULL){
138
140
return 0;
139
141
}
140
142
buffer_capacity += BUFFER_SIZE;
150
152
int ret;
151
153
gpgme_error_t rc;
152
154
gpgme_engine_info_t engine_info;
153
155
154
156
155
157
/*
156
* Helper function to insert pub and seckey to the enigne keyring.
158
* Helper function to insert pub and seckey to the engine keyring.
157
159
*/
158
160
bool import_key(const char *filename){
159
161
int fd;
160
162
gpgme_data_t pgp_data;
161
163
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
164
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
163
165
if(fd == -1){
164
166
perror("open");
165
167
return false;
166
168
}
167
169
168
170
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
171
if(rc != GPG_ERR_NO_ERROR){
170
172
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
173
gpgme_strsource(rc), gpgme_strerror(rc));
172
174
return false;
173
175
}
174
176
175
177
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
178
if(rc != GPG_ERR_NO_ERROR){
177
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
180
gpgme_strsource(rc), gpgme_strerror(rc));
179
181
return false;
180
182
}
181
182
ret = TEMP_FAILURE_RETRY(close(fd));
183
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
183
185
if(ret == -1){
184
186
perror("close");
185
187
}
187
189
return true;
188
190
}
189
191
190
if (debug){
192
if(debug){
191
193
fprintf(stderr, "Initialize gpgme\n");
192
194
}
193
195
194
196
/* Init GPGME */
195
197
gpgme_check_version(NULL);
196
198
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
197
if (rc != GPG_ERR_NO_ERROR){
199
if(rc != GPG_ERR_NO_ERROR){
198
200
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
201
gpgme_strsource(rc), gpgme_strerror(rc));
200
202
return false;
201
203
}
202
204
203
205
/* Set GPGME home directory for the OpenPGP engine only */
204
rc = gpgme_get_engine_info (&engine_info);
205
if (rc != GPG_ERR_NO_ERROR){
206
rc = gpgme_get_engine_info(&engine_info);
207
if(rc != GPG_ERR_NO_ERROR){
206
208
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
209
gpgme_strsource(rc), gpgme_strerror(rc));
208
210
return false;
219
221
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
222
return false;
221
223
}
222
224
223
225
/* Create new GPGME "context" */
224
226
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
227
if(rc != GPG_ERR_NO_ERROR){
226
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
229
gpgme_strsource(rc), gpgme_strerror(rc));
228
230
return false;
229
231
}
230
232
231
if (not import_key(pubkey) or not import_key(seckey)){
233
if(not import_key(pubkey) or not import_key(seckey)){
232
234
return false;
233
235
}
234
236
239
241
* Decrypt OpenPGP data.
240
242
* Returns -1 on error
241
243
*/
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
244
size_t crypto_size,
245
char **plaintext){
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
246
size_t crypto_size,
247
char **plaintext){
246
248
gpgme_data_t dh_crypto, dh_plain;
247
249
gpgme_error_t rc;
248
250
ssize_t ret;
249
251
size_t plaintext_capacity = 0;
250
252
ssize_t plaintext_length = 0;
251
253
252
if (debug){
254
if(debug){
253
255
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
254
256
}
255
257
256
258
/* Create new GPGME data buffer from memory cryptotext */
257
259
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
258
260
0);
259
if (rc != GPG_ERR_NO_ERROR){
261
if(rc != GPG_ERR_NO_ERROR){
260
262
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
261
263
gpgme_strsource(rc), gpgme_strerror(rc));
262
264
return -1;
264
266
265
267
/* Create new empty GPGME data buffer for the plaintext */
266
268
rc = gpgme_data_new(&dh_plain);
267
if (rc != GPG_ERR_NO_ERROR){
269
if(rc != GPG_ERR_NO_ERROR){
268
270
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
269
271
gpgme_strsource(rc), gpgme_strerror(rc));
270
272
gpgme_data_release(dh_crypto);
274
276
/* Decrypt data from the cryptotext data buffer to the plaintext
275
277
data buffer */
276
278
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
277
if (rc != GPG_ERR_NO_ERROR){
279
if(rc != GPG_ERR_NO_ERROR){
278
280
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
281
gpgme_strsource(rc), gpgme_strerror(rc));
280
282
plaintext_length = -1;
281
if (debug){
283
if(debug){
282
284
gpgme_decrypt_result_t result;
283
285
result = gpgme_op_decrypt_result(mc->ctx);
284
if (result == NULL){
286
if(result == NULL){
285
287
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
286
288
} else {
287
289
fprintf(stderr, "Unsupported algorithm: %s\n",
314
316
}
315
317
316
318
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("pgpme_data_seek");
319
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
320
perror("gpgme_data_seek");
319
321
plaintext_length = -1;
320
322
goto decrypt_end;
321
323
}
325
327
plaintext_capacity = adjustbuffer(plaintext,
326
328
(size_t)plaintext_length,
327
329
plaintext_capacity);
328
if (plaintext_capacity == 0){
330
if(plaintext_capacity == 0){
329
331
perror("adjustbuffer");
330
332
plaintext_length = -1;
331
333
goto decrypt_end;
334
336
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
335
337
BUFFER_SIZE);
336
338
/* Print the data, if any */
337
if (ret == 0){
339
if(ret == 0){
338
340
/* EOF */
339
341
break;
340
342
}
364
366
return plaintext_length;
365
367
}
366
368
367
static const char * safer_gnutls_strerror (int value) {
368
const char *ret = gnutls_strerror (value); /* Spurious warning */
369
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)
370
373
ret = "(unknown)";
371
374
return ret;
372
375
}
387
390
}
388
391
389
392
ret = gnutls_global_init();
390
if (ret != GNUTLS_E_SUCCESS) {
391
fprintf (stderr, "GnuTLS global_init: %s\n",
392
safer_gnutls_strerror(ret));
393
if(ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "GnuTLS global_init: %s\n",
395
safer_gnutls_strerror(ret));
393
396
return -1;
394
397
}
395
398
396
if (debug){
399
if(debug){
397
400
/* "Use a log level over 10 to enable all debugging options."
398
401
* - GnuTLS manual
399
402
*/
403
406
404
407
/* OpenPGP credentials */
405
408
gnutls_certificate_allocate_credentials(&mc->cred);
406
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
408
warning */
409
safer_gnutls_strerror(ret));
410
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();
411
416
return -1;
412
417
}
413
418
420
425
ret = gnutls_certificate_set_openpgp_key_file
421
426
(mc->cred, pubkeyfilename, seckeyfilename,
422
427
GNUTLS_OPENPGP_FMT_BASE64);
423
if (ret != GNUTLS_E_SUCCESS) {
428
if(ret != GNUTLS_E_SUCCESS) {
424
429
fprintf(stderr,
425
430
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
431
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
436
432
437
/* GnuTLS server initialization */
433
438
ret = gnutls_dh_params_init(&mc->dh_params);
434
if (ret != GNUTLS_E_SUCCESS) {
435
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
436
" %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));
437
442
goto globalfail;
438
443
}
439
444
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
440
if (ret != GNUTLS_E_SUCCESS) {
441
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
442
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));
443
448
goto globalfail;
444
449
}
445
450
451
456
452
457
gnutls_certificate_free_credentials(mc->cred);
453
458
gnutls_global_deinit();
459
gnutls_dh_params_deinit(mc->dh_params);
454
460
return -1;
455
461
}
456
462
459
465
int ret;
460
466
/* GnuTLS session creation */
461
467
ret = gnutls_init(session, GNUTLS_SERVER);
462
if (ret != GNUTLS_E_SUCCESS){
468
if(ret != GNUTLS_E_SUCCESS){
463
469
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
464
470
safer_gnutls_strerror(ret));
465
471
}
467
473
{
468
474
const char *err;
469
475
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
470
if (ret != GNUTLS_E_SUCCESS) {
476
if(ret != GNUTLS_E_SUCCESS) {
471
477
fprintf(stderr, "Syntax error at: %s\n", err);
472
478
fprintf(stderr, "GnuTLS error: %s\n",
473
479
safer_gnutls_strerror(ret));
474
gnutls_deinit (*session);
480
gnutls_deinit(*session);
475
481
return -1;
476
482
}
477
483
}
478
484
479
485
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
480
486
mc->cred);
481
if (ret != GNUTLS_E_SUCCESS) {
487
if(ret != GNUTLS_E_SUCCESS) {
482
488
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
483
489
safer_gnutls_strerror(ret));
484
gnutls_deinit (*session);
490
gnutls_deinit(*session);
485
491
return -1;
486
492
}
487
493
488
494
/* ignore client certificate if any. */
489
gnutls_certificate_server_set_request (*session,
490
GNUTLS_CERT_IGNORE);
495
gnutls_certificate_server_set_request(*session,
496
GNUTLS_CERT_IGNORE);
491
497
492
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
493
499
494
500
return 0;
495
501
}
503
509
AvahiIfIndex if_index,
504
510
mandos_context *mc){
505
511
int ret, tcp_sd;
512
ssize_t sret;
506
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
507
514
char *buffer = NULL;
508
515
char *decrypted_buffer;
514
521
char interface[IF_NAMESIZE];
515
522
gnutls_session_t session;
516
523
517
ret = init_gnutls_session (mc, &session);
518
if (ret != 0){
524
ret = init_gnutls_session(mc, &session);
525
if(ret != 0){
519
526
return -1;
520
527
}
521
528
543
550
/* It would be nice to have a way to detect if we were passed an
544
551
IPv4 address here. Now we assume an IPv6 address. */
545
552
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
546
if (ret < 0 ){
553
if(ret < 0 ){
547
554
perror("inet_pton");
548
555
return -1;
549
556
}
551
558
fprintf(stderr, "Bad address: %s\n", ip);
552
559
return -1;
553
560
}
554
to.in6.sin6_port = htons(port); /* Spurious warning */
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wconversion and
563
-Wunreachable-code */
555
564
556
565
to.in6.sin6_scope_id = (uint32_t)if_index;
557
566
570
579
}
571
580
572
581
ret = connect(tcp_sd, &to.in, sizeof(to));
573
if (ret < 0){
582
if(ret < 0){
574
583
perror("connect");
575
584
return -1;
576
585
}
577
586
578
587
const char *out = mandos_protocol_version;
579
588
written = 0;
580
while (true){
589
while(true){
581
590
size_t out_size = strlen(out);
582
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
583
592
out_size - written));
584
if (ret == -1){
593
if(ret == -1){
585
594
perror("write");
586
595
retval = -1;
587
596
goto mandos_end;
590
599
if(written < out_size){
591
600
continue;
592
601
} else {
593
if (out == mandos_protocol_version){
602
if(out == mandos_protocol_version){
594
603
written = 0;
595
604
out = "\r\n";
596
605
} else {
603
612
fprintf(stderr, "Establishing TLS session with %s\n", ip);
604
613
}
605
614
606
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
607
616
608
617
do{
609
ret = gnutls_handshake (session);
618
ret = gnutls_handshake(session);
610
619
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
611
620
612
if (ret != GNUTLS_E_SUCCESS){
621
if(ret != GNUTLS_E_SUCCESS){
613
622
if(debug){
614
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
615
gnutls_perror (ret);
624
gnutls_perror(ret);
616
625
}
617
626
retval = -1;
618
627
goto mandos_end;
628
637
while(true){
629
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
630
639
buffer_capacity);
631
if (buffer_capacity == 0){
640
if(buffer_capacity == 0){
632
641
perror("adjustbuffer");
633
642
retval = -1;
634
643
goto mandos_end;
635
644
}
636
645
637
ret = gnutls_record_recv(session, buffer+buffer_length,
638
BUFFER_SIZE);
639
if (ret == 0){
646
sret = gnutls_record_recv(session, buffer+buffer_length,
647
BUFFER_SIZE);
648
if(sret == 0){
640
649
break;
641
650
}
642
if (ret < 0){
643
switch(ret){
651
if(sret < 0){
652
switch(sret){
644
653
case GNUTLS_E_INTERRUPTED:
645
654
case GNUTLS_E_AGAIN:
646
655
break;
647
656
case GNUTLS_E_REHANDSHAKE:
648
657
do{
649
ret = gnutls_handshake (session);
658
ret = gnutls_handshake(session);
650
659
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
651
if (ret < 0){
660
if(ret < 0){
652
661
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
653
gnutls_perror (ret);
662
gnutls_perror(ret);
654
663
retval = -1;
655
664
goto mandos_end;
656
665
}
659
668
fprintf(stderr, "Unknown error while reading data from"
660
669
" encrypted session with Mandos server\n");
661
670
retval = -1;
662
gnutls_bye (session, GNUTLS_SHUT_RDWR);
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
663
672
goto mandos_end;
664
673
}
665
674
} else {
666
buffer_length += (size_t) ret;
675
buffer_length += (size_t) sret;
667
676
}
668
677
}
669
678
671
680
fprintf(stderr, "Closing TLS session\n");
672
681
}
673
682
674
gnutls_bye (session, GNUTLS_SHUT_RDWR);
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
675
684
676
if (buffer_length > 0){
685
if(buffer_length > 0){
677
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
678
687
buffer_length,
679
688
&decrypted_buffer);
680
if (decrypted_buffer_size >= 0){
689
if(decrypted_buffer_size >= 0){
681
690
written = 0;
682
691
while(written < (size_t) decrypted_buffer_size){
683
ret = (int)fwrite (decrypted_buffer + written, 1,
684
(size_t)decrypted_buffer_size - written,
685
stdout);
692
ret = (int)fwrite(decrypted_buffer + written, 1,
693
(size_t)decrypted_buffer_size - written,
694
stdout);
686
695
if(ret == 0 and ferror(stdout)){
687
696
if(debug){
688
697
fprintf(stderr, "Error writing encrypted data: %s\n",
705
714
706
715
mandos_end:
707
716
free(buffer);
708
ret = TEMP_FAILURE_RETRY(close(tcp_sd));
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
709
718
if(ret == -1){
710
719
perror("close");
711
720
}
712
gnutls_deinit (session);
721
gnutls_deinit(session);
713
722
return retval;
714
723
}
715
724
733
742
/* Called whenever a service has been resolved successfully or
734
743
timed out */
735
744
736
switch (event) {
745
switch(event) {
737
746
default:
738
747
case AVAHI_RESOLVER_FAILURE:
739
748
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
747
756
avahi_address_snprint(ip, sizeof(ip), address);
748
757
if(debug){
749
758
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
750
PRIu16 ") on port %d\n", name, host_name, ip,
751
interface, port);
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
760
ip, (intmax_t)interface, port);
752
761
}
753
762
int ret = start_mandos_communication(ip, port, interface, mc);
754
if (ret == 0){
763
if(ret == 0){
755
764
avahi_simple_poll_quit(mc->simple_poll);
756
765
}
757
766
}
775
784
/* Called whenever a new services becomes available on the LAN or
776
785
is removed from the LAN */
777
786
778
switch (event) {
787
switch(event) {
779
788
default:
780
789
case AVAHI_BROWSER_FAILURE:
781
790
790
799
the callback function is called the Avahi server will free the
791
800
resolver for us. */
792
801
793
if (!(avahi_s_service_resolver_new(mc->server, interface,
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
794
803
protocol, name, type, domain,
795
804
AVAHI_PROTO_INET6, 0,
796
805
resolve_callback, mc)))
814
823
AvahiSServiceBrowser *sb = NULL;
815
824
int error;
816
825
int ret;
826
intmax_t tmpmax;
827
int numchars;
817
828
int exitcode = EXIT_SUCCESS;
818
829
const char *interface = "eth0";
819
830
struct ifreq network;
822
833
gid_t gid;
823
834
char *connect_to = NULL;
824
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
825
837
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
826
838
const char *seckey = PATHDIR "/" SECKEY;
827
839
const char *pubkey = PATHDIR "/" PUBKEY;
829
841
mandos_context mc = { .simple_poll = NULL, .server = NULL,
830
842
.dh_bits = 1024, .priority = "SECURE256"
831
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
832
bool gnutls_initalized = false;
833
bool pgpme_initalized = false;
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
846
double delay = 2.5;
834
847
835
848
{
836
849
struct argp_option options[] = {
862
875
.arg = "STRING",
863
876
.doc = "GnuTLS priority string for the TLS handshake",
864
877
.group = 1 },
878
{ .name = "delay", .key = 131,
879
.arg = "SECONDS",
880
.doc = "Maximum delay to wait for interface startup",
881
.group = 2 },
865
882
{ .name = NULL }
866
883
};
867
884
868
error_t parse_opt (int key, char *arg,
869
struct argp_state *state) {
870
/* Get the INPUT argument from `argp_parse', which we know is
871
a pointer to our plugin list pointer. */
872
switch (key) {
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
887
switch(key) {
873
888
case 128: /* --debug */
874
889
debug = true;
875
890
break;
886
901
pubkey = arg;
887
902
break;
888
903
case 129: /* --dh-bits */
889
errno = 0;
890
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
891
if (errno){
892
perror("strtol");
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");
893
908
exit(EXIT_FAILURE);
894
909
}
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
895
911
break;
896
912
case 130: /* --priority */
897
913
mc.priority = arg;
898
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;
899
922
case ARGP_KEY_ARG:
900
argp_usage (state);
923
argp_usage(state);
901
924
case ARGP_KEY_END:
902
925
break;
903
926
default:
910
933
.args_doc = "",
911
934
.doc = "Mandos client -- Get and decrypt"
912
935
" passwords from a Mandos server" };
913
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
914
if (ret == ARGP_ERR_UNKNOWN){
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
915
938
fprintf(stderr, "Unknown error while parsing arguments\n");
916
939
exitcode = EXIT_FAILURE;
917
940
goto end;
918
941
}
919
942
}
920
943
921
ret = init_gnutls_global(&mc, pubkey, seckey);
922
if (ret == -1){
923
fprintf(stderr, "init_gnutls_global failed\n");
924
exitcode = EXIT_FAILURE;
925
goto end;
926
} else {
927
gnutls_initalized = true;
928
}
929
930
if(mkdtemp(tempdir) == NULL){
931
perror("mkdtemp");
932
tempdir[0] = '\0';
933
goto end;
934
}
935
936
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
937
fprintf(stderr, "pgpme_initalized failed\n");
938
exitcode = EXIT_FAILURE;
939
goto end;
940
} else {
941
pgpme_initalized = true;
942
}
943
944
944
/* If the interface is down, bring it up */
945
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
946
953
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
947
954
if(sd < 0) {
948
955
perror("socket");
949
956
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
958
if(ret == -1){
959
perror("klogctl");
960
}
950
961
goto end;
951
962
}
952
963
strcpy(network.ifr_name, interface);
953
964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
965
if(ret == -1){
955
966
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
968
if(ret == -1){
969
perror("klogctl");
970
}
956
971
exitcode = EXIT_FAILURE;
957
972
goto end;
958
973
}
962
977
if(ret == -1){
963
978
perror("ioctl SIOCSIFFLAGS");
964
979
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
981
if(ret == -1){
982
perror("klogctl");
983
}
965
984
goto end;
966
985
}
967
986
}
968
ret = TEMP_FAILURE_RETRY(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));
969
999
if(ret == -1){
970
1000
perror("close");
971
1001
}
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1004
if(ret == -1){
1005
perror("klogctl");
1006
}
972
1007
}
973
1008
974
1009
uid = getuid();
975
1010
gid = getgid();
976
1011
1012
setgid(gid);
1013
if(ret == -1){
1014
perror("setgid");
1015
}
1016
977
1017
ret = setuid(uid);
978
if (ret == -1){
1018
if(ret == -1){
979
1019
perror("setuid");
980
1020
}
981
1021
982
setgid(gid);
983
if (ret == -1){
984
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;
985
1043
}
986
1044
987
1045
if_index = (AvahiIfIndex) if_nametoindex(interface);
988
1046
if(if_index == 0){
989
1047
fprintf(stderr, "No such interface: \"%s\"\n", interface);
990
exit(EXIT_FAILURE);
1048
exitcode = EXIT_FAILURE;
1049
goto end;
991
1050
}
992
1051
993
1052
if(connect_to != NULL){
999
1058
exitcode = EXIT_FAILURE;
1000
1059
goto end;
1001
1060
}
1002
errno = 0;
1003
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
1004
if(errno){
1005
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");
1006
1066
exitcode = EXIT_FAILURE;
1007
1067
goto end;
1008
1068
}
1069
port = (uint16_t)tmpmax;
1009
1070
*address = '\0';
1010
1071
address = connect_to;
1011
1072
ret = start_mandos_communication(address, port, if_index, &mc);
1017
1078
goto end;
1018
1079
}
1019
1080
1020
if (not debug){
1081
if(not debug){
1021
1082
avahi_set_log_function(empty_log);
1022
1083
}
1023
1084
1026
1087
1027
1088
/* Allocate main Avahi loop object */
1028
1089
mc.simple_poll = avahi_simple_poll_new();
1029
if (mc.simple_poll == NULL) {
1090
if(mc.simple_poll == NULL) {
1030
1091
fprintf(stderr, "Avahi: Failed to create simple poll"
1031
1092
" object.\n");
1032
1093
exitcode = EXIT_FAILURE;
1052
1113
}
1053
1114
1054
1115
/* Check if creating the Avahi server object succeeded */
1055
if (mc.server == NULL) {
1116
if(mc.server == NULL) {
1056
1117
fprintf(stderr, "Failed to create Avahi server: %s\n",
1057
1118
avahi_strerror(error));
1058
1119
exitcode = EXIT_FAILURE;
1064
1125
AVAHI_PROTO_INET6,
1065
1126
"_mandos._tcp", NULL, 0,
1066
1127
browse_callback, &mc);
1067
if (sb == NULL) {
1128
if(sb == NULL) {
1068
1129
fprintf(stderr, "Failed to create service browser: %s\n",
1069
1130
avahi_strerror(avahi_server_errno(mc.server)));
1070
1131
exitcode = EXIT_FAILURE;
1073
1134
1074
1135
/* Run the main loop */
1075
1136
1076
if (debug){
1137
if(debug){
1077
1138
fprintf(stderr, "Starting Avahi loop search\n");
1078
1139
}
1079
1140
1080
1141
avahi_simple_poll_loop(mc.simple_poll);
1081
1142
1082
1143
end:
1083
1144
1084
if (debug){
1145
if(debug){
1085
1146
fprintf(stderr, "%s exiting\n", argv[0]);
1086
1147
}
1087
1148
1088
1149
/* Cleanup things */
1089
if (sb != NULL)
1150
if(sb != NULL)
1090
1151
avahi_s_service_browser_free(sb);
1091
1152
1092
if (mc.server != NULL)
1153
if(mc.server != NULL)
1093
1154
avahi_server_free(mc.server);
1094
1155
1095
if (mc.simple_poll != NULL)
1156
if(mc.simple_poll != NULL)
1096
1157
avahi_simple_poll_free(mc.simple_poll);
1097
1158
1098
if (gnutls_initalized){
1159
if(gnutls_initialized){
1099
1160
gnutls_certificate_free_credentials(mc.cred);
1100
gnutls_global_deinit ();
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1101
1163
}
1102
1103
if(pgpme_initalized){
1164
1165
if(gpgme_initialized){
1104
1166
gpgme_release(mc.ctx);
1105
1167
}
1106
1168
1107
1169
/* Removes the temp directory used by GPGME */
1108
if(tempdir[0] != '\0'){
1170
if(tempdir_created){
1109
1171
DIR *d;
1110
1172
struct dirent *direntry;
1111
1173
d = opendir(tempdir);
1112
1174
if(d == NULL){
1113
perror("opendir");
1175
if(errno != ENOENT){
1176
perror("opendir");
1177
}
1114
1178
} else {
1115
1179
while(true){
1116
1180
direntry = readdir(d);
1117
1181
if(direntry == NULL){
1118
1182
break;
1119
1183
}
1120
if (direntry->d_type == DT_REG){
1121
char *fullname = NULL;
1122
ret = asprintf(&fullname, "%s/%s", tempdir,
1123
direntry->d_name);
1124
if(ret < 0){
1125
perror("asprintf");
1126
continue;
1127
}
1128
ret = unlink(fullname);
1129
if(ret == -1){
1130
fprintf(stderr, "unlink(\"%s\"): %s",
1131
fullname, strerror(errno));
1132
}
1133
free(fullname);
1134
}
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);
1135
1204
}
1205
closedir(d);
1136
1206
}
1137
1207
ret = rmdir(tempdir);
1138
if(ret == -1){
1208
if(ret == -1 and errno != ENOENT){
1139
1209
perror("rmdir");
1140
1210
}
1141
1211
}
1142
1212
1143
1213
return exitcode;
1144
1214
}
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0