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- Committer: Teddy Hogeborn
- Date: 2009-02-07 04:50:39 UTC
- Revision ID: teddy@fukt.bsnet.se-20090207045039-xkr6b80vtqwqrq8l
* Makefile (install-client-nokey): Move "initramfs-tools-script" from
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
"/scripts/local-top/mandos" to
"/scripts/init-premount/mandos".
(uninstall-client): - '' -
* debian/mandos-client.dirs: - '' -
* initramfs-tools-script (PREREQ): Added "udev".
- files removed:
- DBUS-API
- debian/source
- files modified:
- .bzrignore
added
removed
plugins.d/mandos-client.c
9
9
* "browse_callback", and parts of "main".
10
10
*
11
11
* Everything else is
12
* Copyright © 2008-2011 Teddy Hogeborn
13
* Copyright © 2008-2011 Björn Påhlsson
12
* Copyright © 2008,2009 Teddy Hogeborn
13
* Copyright © 2008,2009 Björn Påhlsson
14
14
*
15
15
* This program is free software: you can redistribute it and/or
16
16
* modify it under the terms of the GNU General Public License as
30
30
*/
31
31
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
33
#define _LARGEFILE_SOURCE
35
#endif
36
#ifndef _FILE_OFFSET_BITS
37
34
#define _FILE_OFFSET_BITS 64
38
#endif
39
35
40
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
37
42
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
stdout, ferror(), sscanf(),
40
remove() */
44
41
#include <stdint.h> /* uint16_t, uint32_t */
45
42
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
44
srand() */
45
#include <stdbool.h> /* bool, true */
49
46
#include <string.h> /* memset(), strcmp(), strlen(),
50
47
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
48
#include <sys/ioctl.h> /* ioctl */
52
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
50
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
55
opendir(), DIR */
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
53
DIR */
56
54
#include <sys/stat.h> /* open() */
57
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
56
struct in6_addr, inet_pton(),
57
connect() */
59
58
#include <fcntl.h> /* open() */
60
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
60
*/
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
63
strtoimax() */
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
64
62
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
68
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
66
SIOCSIFFLAGS, if_indextoname(),
70
67
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
*/
68
#include <netinet/in.h>
74
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
70
getuid(), getgid(), setuid(),
71
setgid() */
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
79
74
#include <argp.h> /* struct argp_option, error_t, struct
80
75
argp_state, struct argp,
81
76
argp_parse(), ARGP_KEY_ARG,
82
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
85
raise() */
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
89
78
#ifdef __linux__
90
79
#include <sys/klog.h> /* klogctl() */
91
#endif /* __linux__ */
80
#endif
92
81
93
82
/* Avahi */
94
83
/* All Avahi types, constants and functions
128
117
static const char mandos_protocol_version[] = "1";
129
118
const char *argp_program_version = "mandos-client " VERSION;
130
119
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
131
static const char sys_class_net[] = "/sys/class/net";
132
char *connect_to = NULL;
133
134
/* Doubly linked list that need to be circularly linked when used */
135
typedef struct server{
136
const char *ip;
137
uint16_t port;
138
AvahiIfIndex if_index;
139
int af;
140
struct timespec last_seen;
141
struct server *next;
142
struct server *prev;
143
} server;
144
120
145
121
/* Used for passing in values through the Avahi callback functions */
146
122
typedef struct {
151
127
gnutls_dh_params_t dh_params;
152
128
const char *priority;
153
129
gpgme_ctx_t ctx;
154
server *current_server;
155
130
} mandos_context;
156
131
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
162
163
sig_atomic_t quit_now = 0;
164
int signal_received = 0;
165
166
/* Function to use when printing errors */
167
void perror_plus(const char *print_text){
168
fprintf(stderr, "Mandos plugin %s: ",
169
program_invocation_short_name);
170
perror(print_text);
171
}
172
173
132
/*
174
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
* bytes. "buffer_capacity" is how much is currently allocated,
133
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
134
* "buffer_capacity" is how much is currently allocated,
176
135
* "buffer_length" is how much is already used.
177
136
*/
178
size_t incbuffer(char **buffer, size_t buffer_length,
137
size_t adjustbuffer(char **buffer, size_t buffer_length,
179
138
size_t buffer_capacity){
180
139
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
140
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
187
146
return buffer_capacity;
188
147
}
189
148
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
192
int af){
193
int ret;
194
server *new_server = malloc(sizeof(server));
195
if(new_server == NULL){
196
perror_plus("malloc");
197
return -1;
198
}
199
*new_server = (server){ .ip = strdup(ip),
200
.port = port,
201
.if_index = if_index,
202
.af = af };
203
if(new_server->ip == NULL){
204
perror_plus("strdup");
205
return -1;
206
}
207
/* unique case of first server */
208
if (mc.current_server == NULL){
209
new_server->next = new_server;
210
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
213
} else {
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
216
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
218
}
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
220
if(ret == -1){
221
perror_plus("clock_gettime");
222
return -1;
223
}
224
return 0;
225
}
226
227
149
/*
228
150
* Initialize GPGME.
229
151
*/
230
static bool init_gpgme(const char *seckey,
152
static bool init_gpgme(mandos_context *mc, const char *seckey,
231
153
const char *pubkey, const char *tempdir){
154
int ret;
232
155
gpgme_error_t rc;
233
156
gpgme_engine_info_t engine_info;
234
157
237
160
* Helper function to insert pub and seckey to the engine keyring.
238
161
*/
239
162
bool import_key(const char *filename){
240
int ret;
241
163
int fd;
242
164
gpgme_data_t pgp_data;
243
165
244
166
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
245
167
if(fd == -1){
246
perror_plus("open");
168
perror("open");
247
169
return false;
248
170
}
249
171
254
176
return false;
255
177
}
256
178
257
rc = gpgme_op_import(mc.ctx, pgp_data);
179
rc = gpgme_op_import(mc->ctx, pgp_data);
258
180
if(rc != GPG_ERR_NO_ERROR){
259
181
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
260
182
gpgme_strsource(rc), gpgme_strerror(rc));
263
185
264
186
ret = (int)TEMP_FAILURE_RETRY(close(fd));
265
187
if(ret == -1){
266
perror_plus("close");
188
perror("close");
267
189
}
268
190
gpgme_data_release(pgp_data);
269
191
return true;
270
192
}
271
193
272
194
if(debug){
273
fprintf(stderr, "Initializing GPGME\n");
195
fprintf(stderr, "Initialize gpgme\n");
274
196
}
275
197
276
198
/* Init GPGME */
303
225
}
304
226
305
227
/* Create new GPGME "context" */
306
rc = gpgme_new(&(mc.ctx));
228
rc = gpgme_new(&(mc->ctx));
307
229
if(rc != GPG_ERR_NO_ERROR){
308
230
fprintf(stderr, "bad gpgme_new: %s: %s\n",
309
231
gpgme_strsource(rc), gpgme_strerror(rc));
314
236
return false;
315
237
}
316
238
317
return true;
239
return true;
318
240
}
319
241
320
242
/*
321
243
* Decrypt OpenPGP data.
322
244
* Returns -1 on error
323
245
*/
324
static ssize_t pgp_packet_decrypt(const char *cryptotext,
246
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
247
const char *cryptotext,
325
248
size_t crypto_size,
326
249
char **plaintext){
327
250
gpgme_data_t dh_crypto, dh_plain;
354
277
355
278
/* Decrypt data from the cryptotext data buffer to the plaintext
356
279
data buffer */
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
280
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
281
if(rc != GPG_ERR_NO_ERROR){
359
282
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
283
gpgme_strsource(rc), gpgme_strerror(rc));
361
284
plaintext_length = -1;
362
285
if(debug){
363
286
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
287
result = gpgme_op_decrypt_result(mc->ctx);
365
288
if(result == NULL){
366
289
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
367
290
} else {
374
297
}
375
298
gpgme_recipient_t recipient;
376
299
recipient = result->recipients;
377
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
383
? "No" : "Yes");
384
recipient = recipient->next;
300
if(recipient){
301
while(recipient != NULL){
302
fprintf(stderr, "Public key algorithm: %s\n",
303
gpgme_pubkey_algo_name(recipient->pubkey_algo));
304
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
305
fprintf(stderr, "Secret key available: %s\n",
306
recipient->status == GPG_ERR_NO_SECKEY
307
? "No" : "Yes");
308
recipient = recipient->next;
309
}
385
310
}
386
311
}
387
312
}
394
319
395
320
/* Seek back to the beginning of the GPGME plaintext data buffer */
396
321
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
397
perror_plus("gpgme_data_seek");
322
perror("gpgme_data_seek");
398
323
plaintext_length = -1;
399
324
goto decrypt_end;
400
325
}
401
326
402
327
*plaintext = NULL;
403
328
while(true){
404
plaintext_capacity = incbuffer(plaintext,
329
plaintext_capacity = adjustbuffer(plaintext,
405
330
(size_t)plaintext_length,
406
331
plaintext_capacity);
407
332
if(plaintext_capacity == 0){
408
perror_plus("incbuffer");
333
perror("adjustbuffer");
409
334
plaintext_length = -1;
410
335
goto decrypt_end;
411
336
}
418
343
break;
419
344
}
420
345
if(ret < 0){
421
perror_plus("gpgme_data_read");
346
perror("gpgme_data_read");
422
347
plaintext_length = -1;
423
348
goto decrypt_end;
424
349
}
457
382
fprintf(stderr, "GnuTLS: %s", string);
458
383
}
459
384
460
static int init_gnutls_global(const char *pubkeyfilename,
385
static int init_gnutls_global(mandos_context *mc,
386
const char *pubkeyfilename,
461
387
const char *seckeyfilename){
462
388
int ret;
463
389
481
407
}
482
408
483
409
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
410
gnutls_certificate_allocate_credentials(&mc->cred);
485
411
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
412
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
* from
414
* -Wunreachable-code
415
*/
487
416
safer_gnutls_strerror(ret));
488
417
gnutls_global_deinit();
489
418
return -1;
496
425
}
497
426
498
427
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
428
(mc->cred, pubkeyfilename, seckeyfilename,
500
429
GNUTLS_OPENPGP_FMT_BASE64);
501
430
if(ret != GNUTLS_E_SUCCESS){
502
431
fprintf(stderr,
508
437
}
509
438
510
439
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
440
ret = gnutls_dh_params_init(&mc->dh_params);
512
441
if(ret != GNUTLS_E_SUCCESS){
513
442
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
443
" %s\n", safer_gnutls_strerror(ret));
515
444
goto globalfail;
516
445
}
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
446
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
447
if(ret != GNUTLS_E_SUCCESS){
519
448
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
449
safer_gnutls_strerror(ret));
521
450
goto globalfail;
522
451
}
523
452
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
453
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
525
454
526
455
return 0;
527
456
528
457
globalfail:
529
458
530
gnutls_certificate_free_credentials(mc.cred);
459
gnutls_certificate_free_credentials(mc->cred);
531
460
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
461
gnutls_dh_params_deinit(mc->dh_params);
533
462
return -1;
534
463
}
535
464
536
static int init_gnutls_session(gnutls_session_t *session){
465
static int init_gnutls_session(mandos_context *mc,
466
gnutls_session_t *session){
537
467
int ret;
538
468
/* GnuTLS session creation */
539
do {
540
ret = gnutls_init(session, GNUTLS_SERVER);
541
if(quit_now){
542
return -1;
543
}
544
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
469
ret = gnutls_init(session, GNUTLS_SERVER);
545
470
if(ret != GNUTLS_E_SUCCESS){
546
471
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
547
472
safer_gnutls_strerror(ret));
549
474
550
475
{
551
476
const char *err;
552
do {
553
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
554
if(quit_now){
555
gnutls_deinit(*session);
556
return -1;
557
}
558
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
559
478
if(ret != GNUTLS_E_SUCCESS){
560
479
fprintf(stderr, "Syntax error at: %s\n", err);
561
480
fprintf(stderr, "GnuTLS error: %s\n",
565
484
}
566
485
}
567
486
568
do {
569
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
570
mc.cred);
571
if(quit_now){
572
gnutls_deinit(*session);
573
return -1;
574
}
575
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
487
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
488
mc->cred);
576
489
if(ret != GNUTLS_E_SUCCESS){
577
490
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
578
491
safer_gnutls_strerror(ret));
581
494
}
582
495
583
496
/* ignore client certificate if any. */
584
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
497
gnutls_certificate_server_set_request(*session,
498
GNUTLS_CERT_IGNORE);
585
499
586
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
500
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
587
501
588
502
return 0;
589
503
}
595
509
/* Called when a Mandos server is found */
596
510
static int start_mandos_communication(const char *ip, uint16_t port,
597
511
AvahiIfIndex if_index,
598
int af){
599
int ret, tcp_sd = -1;
512
mandos_context *mc){
513
int ret, tcp_sd;
600
514
ssize_t sret;
601
union {
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
604
} to;
515
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
605
516
char *buffer = NULL;
606
char *decrypted_buffer = NULL;
517
char *decrypted_buffer;
607
518
size_t buffer_length = 0;
608
519
size_t buffer_capacity = 0;
520
ssize_t decrypted_buffer_size;
609
521
size_t written;
610
int retval = -1;
522
int retval = 0;
523
char interface[IF_NAMESIZE];
611
524
gnutls_session_t session;
612
int pf; /* Protocol family */
613
614
errno = 0;
615
616
if(quit_now){
617
errno = EINTR;
618
return -1;
619
}
620
621
switch(af){
622
case AF_INET6:
623
pf = PF_INET6;
624
break;
625
case AF_INET:
626
pf = PF_INET;
627
break;
628
default:
629
fprintf(stderr, "Bad address family: %d\n", af);
630
errno = EINVAL;
631
return -1;
632
}
633
634
ret = init_gnutls_session(&session);
525
526
ret = init_gnutls_session(mc, &session);
635
527
if(ret != 0){
636
528
return -1;
637
529
}
638
530
639
531
if(debug){
640
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
532
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
641
533
"\n", ip, port);
642
534
}
643
535
644
tcp_sd = socket(pf, SOCK_STREAM, 0);
536
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
645
537
if(tcp_sd < 0){
646
int e = errno;
647
perror_plus("socket");
648
errno = e;
649
goto mandos_end;
538
perror("socket");
539
return -1;
650
540
}
651
541
652
if(quit_now){
653
errno = EINTR;
654
goto mandos_end;
542
if(debug){
543
if(if_indextoname((unsigned int)if_index, interface) == NULL){
544
perror("if_indextoname");
545
return -1;
546
}
547
fprintf(stderr, "Binding to interface %s\n", interface);
655
548
}
656
549
657
550
memset(&to, 0, sizeof(to));
658
if(af == AF_INET6){
659
to.in6.sin6_family = (sa_family_t)af;
660
ret = inet_pton(af, ip, &to.in6.sin6_addr);
661
} else { /* IPv4 */
662
to.in.sin_family = (sa_family_t)af;
663
ret = inet_pton(af, ip, &to.in.sin_addr);
664
}
551
to.in6.sin6_family = AF_INET6;
552
/* It would be nice to have a way to detect if we were passed an
553
IPv4 address here. Now we assume an IPv6 address. */
554
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
665
555
if(ret < 0 ){
666
int e = errno;
667
perror_plus("inet_pton");
668
errno = e;
669
goto mandos_end;
556
perror("inet_pton");
557
return -1;
670
558
}
671
559
if(ret == 0){
672
int e = errno;
673
560
fprintf(stderr, "Bad address: %s\n", ip);
674
errno = e;
675
goto mandos_end;
561
return -1;
676
562
}
677
if(af == AF_INET6){
678
to.in6.sin6_port = htons(port); /* Spurious warnings from
679
-Wconversion and
680
-Wunreachable-code */
681
682
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
683
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
684
-Wunreachable-code*/
685
if(if_index == AVAHI_IF_UNSPEC){
686
fprintf(stderr, "An IPv6 link-local address is incomplete"
687
" without a network interface\n");
688
errno = EINVAL;
689
goto mandos_end;
690
}
691
/* Set the network interface number as scope */
692
to.in6.sin6_scope_id = (uint32_t)if_index;
693
}
694
} else {
695
to.in.sin_port = htons(port); /* Spurious warnings from
563
to.in6.sin6_port = htons(port); /* Spurious warnings from
696
564
-Wconversion and
697
565
-Wunreachable-code */
698
}
699
566
700
if(quit_now){
701
errno = EINTR;
702
goto mandos_end;
703
}
567
to.in6.sin6_scope_id = (uint32_t)if_index;
704
568
705
569
if(debug){
706
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
707
char interface[IF_NAMESIZE];
708
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
perror_plus("if_indextoname");
710
} else {
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
713
}
714
} else {
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
716
port);
717
}
718
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
720
const char *pcret;
721
if(af == AF_INET6){
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
723
sizeof(addrstr));
724
} else {
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
726
sizeof(addrstr));
727
}
728
if(pcret == NULL){
729
perror_plus("inet_ntop");
570
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
571
port);
572
char addrstr[INET6_ADDRSTRLEN] = "";
573
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
574
sizeof(addrstr)) == NULL){
575
perror("inet_ntop");
730
576
} else {
731
577
if(strcmp(addrstr, ip) != 0){
732
578
fprintf(stderr, "Canonical address form: %s\n", addrstr);
734
580
}
735
581
}
736
582
737
if(quit_now){
738
errno = EINTR;
739
goto mandos_end;
740
}
741
742
if(af == AF_INET6){
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
744
} else {
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
746
}
583
ret = connect(tcp_sd, &to.in, sizeof(to));
747
584
if(ret < 0){
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
749
int e = errno;
750
perror_plus("connect");
751
errno = e;
752
}
753
goto mandos_end;
754
}
755
756
if(quit_now){
757
errno = EINTR;
758
goto mandos_end;
585
perror("connect");
586
return -1;
759
587
}
760
588
761
589
const char *out = mandos_protocol_version;
765
593
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
766
594
out_size - written));
767
595
if(ret == -1){
768
int e = errno;
769
perror_plus("write");
770
errno = e;
596
perror("write");
597
retval = -1;
771
598
goto mandos_end;
772
599
}
773
600
written += (size_t)ret;
781
608
break;
782
609
}
783
610
}
784
785
if(quit_now){
786
errno = EINTR;
787
goto mandos_end;
788
}
789
611
}
790
612
791
613
if(debug){
792
614
fprintf(stderr, "Establishing TLS session with %s\n", ip);
793
615
}
794
616
795
if(quit_now){
796
errno = EINTR;
797
goto mandos_end;
798
}
799
800
/* Spurious warning from -Wint-to-pointer-cast */
801
617
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
802
618
803
if(quit_now){
804
errno = EINTR;
805
goto mandos_end;
806
}
807
808
do {
619
do{
809
620
ret = gnutls_handshake(session);
810
if(quit_now){
811
errno = EINTR;
812
goto mandos_end;
813
}
814
621
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
815
622
816
623
if(ret != GNUTLS_E_SUCCESS){
818
625
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
819
626
gnutls_perror(ret);
820
627
}
821
errno = EPROTO;
628
retval = -1;
822
629
goto mandos_end;
823
630
}
824
631
825
632
/* Read OpenPGP packet that contains the wanted password */
826
633
827
634
if(debug){
828
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
635
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
829
636
ip);
830
637
}
831
638
832
639
while(true){
833
834
if(quit_now){
835
errno = EINTR;
836
goto mandos_end;
837
}
838
839
buffer_capacity = incbuffer(&buffer, buffer_length,
640
buffer_capacity = adjustbuffer(&buffer, buffer_length,
840
641
buffer_capacity);
841
642
if(buffer_capacity == 0){
842
int e = errno;
843
perror_plus("incbuffer");
844
errno = e;
845
goto mandos_end;
846
}
847
848
if(quit_now){
849
errno = EINTR;
643
perror("adjustbuffer");
644
retval = -1;
850
645
goto mandos_end;
851
646
}
852
647
861
656
case GNUTLS_E_AGAIN:
862
657
break;
863
658
case GNUTLS_E_REHANDSHAKE:
864
do {
659
do{
865
660
ret = gnutls_handshake(session);
866
867
if(quit_now){
868
errno = EINTR;
869
goto mandos_end;
870
}
871
661
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
872
662
if(ret < 0){
873
663
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
874
664
gnutls_perror(ret);
875
errno = EPROTO;
665
retval = -1;
876
666
goto mandos_end;
877
667
}
878
668
break;
879
669
default:
880
670
fprintf(stderr, "Unknown error while reading data from"
881
671
" encrypted session with Mandos server\n");
672
retval = -1;
882
673
gnutls_bye(session, GNUTLS_SHUT_RDWR);
883
errno = EIO;
884
674
goto mandos_end;
885
675
}
886
676
} else {
892
682
fprintf(stderr, "Closing TLS session\n");
893
683
}
894
684
895
if(quit_now){
896
errno = EINTR;
897
goto mandos_end;
898
}
899
900
do {
901
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
902
if(quit_now){
903
errno = EINTR;
904
goto mandos_end;
905
}
906
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
685
gnutls_bye(session, GNUTLS_SHUT_RDWR);
907
686
908
687
if(buffer_length > 0){
909
ssize_t decrypted_buffer_size;
910
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
911
689
buffer_length,
912
690
&decrypted_buffer);
913
691
if(decrypted_buffer_size >= 0){
914
915
692
written = 0;
916
693
while(written < (size_t) decrypted_buffer_size){
917
if(quit_now){
918
errno = EINTR;
919
goto mandos_end;
920
}
921
922
694
ret = (int)fwrite(decrypted_buffer + written, 1,
923
695
(size_t)decrypted_buffer_size - written,
924
696
stdout);
925
697
if(ret == 0 and ferror(stdout)){
926
int e = errno;
927
698
if(debug){
928
699
fprintf(stderr, "Error writing encrypted data: %s\n",
929
700
strerror(errno));
930
701
}
931
errno = e;
932
goto mandos_end;
702
retval = -1;
703
break;
933
704
}
934
705
written += (size_t)ret;
935
706
}
936
retval = 0;
707
free(decrypted_buffer);
708
} else {
709
retval = -1;
937
710
}
711
} else {
712
retval = -1;
938
713
}
939
714
940
715
/* Shutdown procedure */
941
716
942
717
mandos_end:
943
{
944
int e = errno;
945
free(decrypted_buffer);
946
free(buffer);
947
if(tcp_sd >= 0){
948
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
949
}
950
if(ret == -1){
951
if(e == 0){
952
e = errno;
953
}
954
perror_plus("close");
955
}
956
gnutls_deinit(session);
957
errno = e;
958
if(quit_now){
959
errno = EINTR;
960
retval = -1;
961
}
718
free(buffer);
719
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
720
if(ret == -1){
721
perror("close");
962
722
}
723
gnutls_deinit(session);
963
724
return retval;
964
725
}
965
726
966
727
static void resolve_callback(AvahiSServiceResolver *r,
967
728
AvahiIfIndex interface,
968
AvahiProtocol proto,
729
AVAHI_GCC_UNUSED AvahiProtocol protocol,
969
730
AvahiResolverEvent event,
970
731
const char *name,
971
732
const char *type,
976
737
AVAHI_GCC_UNUSED AvahiStringList *txt,
977
738
AVAHI_GCC_UNUSED AvahiLookupResultFlags
978
739
flags,
979
AVAHI_GCC_UNUSED void* userdata){
740
void* userdata){
741
mandos_context *mc = userdata;
980
742
assert(r);
981
743
982
744
/* Called whenever a service has been resolved successfully or
983
745
timed out */
984
746
985
if(quit_now){
986
return;
987
}
988
989
747
switch(event){
990
748
default:
991
749
case AVAHI_RESOLVER_FAILURE:
992
750
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
993
751
" of type '%s' in domain '%s': %s\n", name, type, domain,
994
avahi_strerror(avahi_server_errno(mc.server)));
752
avahi_strerror(avahi_server_errno(mc->server)));
995
753
break;
996
754
997
755
case AVAHI_RESOLVER_FOUND:
1003
761
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
762
ip, (intmax_t)interface, port);
1005
763
}
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
764
int ret = start_mandos_communication(ip, port, interface, mc);
1008
765
if(ret == 0){
1009
avahi_simple_poll_quit(mc.simple_poll);
1010
} else {
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
766
avahi_simple_poll_quit(mc->simple_poll);
1013
767
}
1014
768
}
1015
769
}
1025
779
const char *domain,
1026
780
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1027
781
flags,
1028
AVAHI_GCC_UNUSED void* userdata){
782
void* userdata){
783
mandos_context *mc = userdata;
1029
784
assert(b);
1030
785
1031
786
/* Called whenever a new services becomes available on the LAN or
1032
787
is removed from the LAN */
1033
788
1034
if(quit_now){
1035
return;
1036
}
1037
1038
789
switch(event){
1039
790
default:
1040
791
case AVAHI_BROWSER_FAILURE:
1041
792
1042
793
fprintf(stderr, "(Avahi browser) %s\n",
1043
avahi_strerror(avahi_server_errno(mc.server)));
1044
avahi_simple_poll_quit(mc.simple_poll);
794
avahi_strerror(avahi_server_errno(mc->server)));
795
avahi_simple_poll_quit(mc->simple_poll);
1045
796
return;
1046
797
1047
798
case AVAHI_BROWSER_NEW:
1050
801
the callback function is called the Avahi server will free the
1051
802
resolver for us. */
1052
803
1053
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1054
name, type, domain, protocol, 0,
1055
resolve_callback, NULL) == NULL)
804
if(!(avahi_s_service_resolver_new(mc->server, interface,
805
protocol, name, type, domain,
806
AVAHI_PROTO_INET6, 0,
807
resolve_callback, mc)))
1056
808
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
1057
name, avahi_strerror(avahi_server_errno(mc.server)));
809
name, avahi_strerror(avahi_server_errno(mc->server)));
1058
810
break;
1059
811
1060
812
case AVAHI_BROWSER_REMOVE:
1069
821
}
1070
822
}
1071
823
1072
/* Signal handler that stops main loop after SIGTERM */
1073
static void handle_sigterm(int sig){
1074
if(quit_now){
1075
return;
1076
}
1077
quit_now = 1;
1078
signal_received = sig;
1079
int old_errno = errno;
1080
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1083
}
1084
errno = old_errno;
1085
}
1086
1087
/*
1088
* This function determines if a directory entry in /sys/class/net
1089
* corresponds to an acceptable network device.
1090
* (This function is passed to scandir(3) as a filter function.)
1091
*/
1092
int good_interface(const struct dirent *if_entry){
1093
ssize_t ssret;
1094
char *flagname = NULL;
1095
if(if_entry->d_name[0] == '.'){
1096
return 0;
1097
}
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1099
if_entry->d_name);
1100
if(ret < 0){
1101
perror_plus("asprintf");
1102
return 0;
1103
}
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1105
if(flags_fd == -1){
1106
perror_plus("open");
1107
free(flagname);
1108
return 0;
1109
}
1110
free(flagname);
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1118
close(flags_fd);
1119
return 0;
1120
}
1121
while(to_read > 0){
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1123
(size_t)to_read));
1124
if(ssret == -1){
1125
perror_plus("read");
1126
free(flagstring);
1127
close(flags_fd);
1128
return 0;
1129
}
1130
to_read -= ssret;
1131
if(ssret == 0){
1132
break;
1133
}
1134
}
1135
close(flags_fd);
1136
intmax_t tmpmax;
1137
char *tmp;
1138
errno = 0;
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1143
if(debug){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1146
}
1147
free(flagstring);
1148
return 0;
1149
}
1150
free(flagstring);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1154
if(debug){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1156
if_entry->d_name);
1157
}
1158
return 0;
1159
}
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1162
if(debug){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1164
if_entry->d_name);
1165
}
1166
return 1;
1167
}
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1170
if(debug){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1172
if_entry->d_name);
1173
}
1174
return 0;
1175
}
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1178
if(debug){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1180
if_entry->d_name);
1181
}
1182
return 0;
1183
}
1184
/* Accept this device */
1185
if(debug){
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1187
if_entry->d_name);
1188
}
1189
return 1;
1190
}
1191
1192
int notdotentries(const struct dirent *direntry){
1193
/* Skip "." and ".." */
1194
if(direntry->d_name[0] == '.'
1195
and (direntry->d_name[1] == '\0'
1196
or (direntry->d_name[1] == '.'
1197
and direntry->d_name[2] == '\0'))){
1198
return 0;
1199
}
1200
return 1;
1201
}
1202
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1204
int ret;
1205
struct timespec now;
1206
struct timespec waited_time;
1207
intmax_t block_time;
1208
1209
while(true){
1210
if(mc.current_server == NULL){
1211
if (debug){
1212
fprintf(stderr,
1213
"Wait until first server is found. No timeout!\n");
1214
}
1215
ret = avahi_simple_poll_iterate(s, -1);
1216
} else {
1217
if (debug){
1218
fprintf(stderr, "Check current_server if we should run it,"
1219
" or wait\n");
1220
}
1221
/* the current time */
1222
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1223
if(ret == -1){
1224
perror_plus("clock_gettime");
1225
return -1;
1226
}
1227
/* Calculating in ms how long time between now and server
1228
who we visted longest time ago. Now - last seen. */
1229
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1231
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1233
/* total time is 10s/10,000ms.
1234
Converting to s from ms by dividing by 1,000,
1235
and ns to ms by dividing by 1,000,000. */
1236
block_time = ((retry_interval
1237
- ((intmax_t)waited_time.tv_sec * 1000))
1238
- ((intmax_t)waited_time.tv_nsec / 1000000));
1239
1240
if (debug){
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1242
}
1243
1244
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1249
if(ret == 0){
1250
avahi_simple_poll_quit(mc.simple_poll);
1251
return 0;
1252
}
1253
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1255
if(ret == -1){
1256
perror_plus("clock_gettime");
1257
return -1;
1258
}
1259
mc.current_server = mc.current_server->next;
1260
block_time = 0; /* Call avahi to find new Mandos
1261
servers, but don't block */
1262
}
1263
1264
ret = avahi_simple_poll_iterate(s, (int)block_time);
1265
}
1266
if(ret != 0){
1267
if (ret > 0 or errno != EINTR) {
1268
return (ret != 1) ? ret : 0;
1269
}
1270
}
1271
}
1272
}
1273
1274
824
int main(int argc, char *argv[]){
1275
825
AvahiSServiceBrowser *sb = NULL;
1276
826
int error;
1277
827
int ret;
1278
828
intmax_t tmpmax;
1279
char *tmp;
829
int numchars;
1280
830
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
831
const char *interface = "eth0";
1282
832
struct ifreq network;
1283
int sd = -1;
1284
bool take_down_interface = false;
833
int sd;
1285
834
uid_t uid;
1286
835
gid_t gid;
836
char *connect_to = NULL;
1287
837
char tempdir[] = "/tmp/mandosXXXXXX";
1288
838
bool tempdir_created = false;
1289
839
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
840
const char *seckey = PATHDIR "/" SECKEY;
1291
841
const char *pubkey = PATHDIR "/" PUBKEY;
1292
842
843
mandos_context mc = { .simple_poll = NULL, .server = NULL,
844
.dh_bits = 1024, .priority = "SECURE256"
845
":!CTYPE-X.509:+CTYPE-OPENPGP" };
1293
846
bool gnutls_initialized = false;
1294
847
bool gpgme_initialized = false;
1295
float delay = 2.5f;
1296
double retry_interval = 10; /* 10s between trying a server and
1297
retrying the same server again */
1298
1299
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1300
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1301
1302
uid = getuid();
1303
gid = getgid();
1304
1305
/* Lower any group privileges we might have, just to be safe */
1306
errno = 0;
1307
ret = setgid(gid);
1308
if(ret == -1){
1309
perror_plus("setgid");
1310
}
1311
1312
/* Lower user privileges (temporarily) */
1313
errno = 0;
1314
ret = seteuid(uid);
1315
if(ret == -1){
1316
perror_plus("seteuid");
1317
}
1318
1319
if(quit_now){
1320
goto end;
1321
}
848
double delay = 2.5;
1322
849
1323
850
{
1324
851
struct argp_option options[] = {
1330
857
.group = 1 },
1331
858
{ .name = "interface", .key = 'i',
1332
859
.arg = "NAME",
1333
.doc = "Network interface that will be used to search for"
1334
" Mandos servers",
860
.doc = "Interface that will be used to search for Mandos"
861
" servers",
1335
862
.group = 1 },
1336
863
{ .name = "seckey", .key = 's',
1337
864
.arg = "FILE",
1354
881
.arg = "SECONDS",
1355
882
.doc = "Maximum delay to wait for interface startup",
1356
883
.group = 2 },
1357
{ .name = "retry", .key = 132,
1358
.arg = "SECONDS",
1359
.doc = "Retry interval used when denied by the mandos server",
1360
.group = 2 },
1361
/*
1362
* These reproduce what we would get without ARGP_NO_HELP
1363
*/
1364
{ .name = "help", .key = '?',
1365
.doc = "Give this help list", .group = -1 },
1366
{ .name = "usage", .key = -3,
1367
.doc = "Give a short usage message", .group = -1 },
1368
{ .name = "version", .key = 'V',
1369
.doc = "Print program version", .group = -1 },
1370
884
{ .name = NULL }
1371
885
};
1372
886
1373
887
error_t parse_opt(int key, char *arg,
1374
888
struct argp_state *state){
1375
errno = 0;
1376
889
switch(key){
1377
890
case 128: /* --debug */
1378
891
debug = true;
1390
903
pubkey = arg;
1391
904
break;
1392
905
case 129: /* --dh-bits */
1393
errno = 0;
1394
tmpmax = strtoimax(arg, &tmp, 10);
1395
if(errno != 0 or tmp == arg or *tmp != '\0'
1396
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1397
argp_error(state, "Bad number of DH bits");
906
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
907
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
908
or arg[numchars] != '\0'){
909
fprintf(stderr, "Bad number of DH bits\n");
910
exit(EXIT_FAILURE);
1398
911
}
1399
912
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1400
913
break;
1402
915
mc.priority = arg;
1403
916
break;
1404
917
case 131: /* --delay */
1405
errno = 0;
1406
delay = strtof(arg, &tmp);
1407
if(errno != 0 or tmp == arg or *tmp != '\0'){
1408
argp_error(state, "Bad delay");
1409
}
1410
case 132: /* --retry */
1411
errno = 0;
1412
retry_interval = strtod(arg, &tmp);
1413
if(errno != 0 or tmp == arg or *tmp != '\0'
1414
or (retry_interval * 1000) > INT_MAX){
1415
argp_error(state, "Bad retry interval");
918
ret = sscanf(arg, "%lf%n", &delay, &numchars);
919
if(ret < 1 or arg[numchars] != '\0'){
920
fprintf(stderr, "Bad delay\n");
921
exit(EXIT_FAILURE);
1416
922
}
1417
923
break;
1418
/*
1419
* These reproduce what we would get without ARGP_NO_HELP
1420
*/
1421
case '?': /* --help */
1422
argp_state_help(state, state->out_stream,
1423
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1424
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1425
case -3: /* --usage */
1426
argp_state_help(state, state->out_stream,
1427
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1428
case 'V': /* --version */
1429
fprintf(state->out_stream, "%s\n", argp_program_version);
1430
exit(argp_err_exit_status);
924
case ARGP_KEY_ARG:
925
argp_usage(state);
926
case ARGP_KEY_END:
1431
927
break;
1432
928
default:
1433
929
return ARGP_ERR_UNKNOWN;
1434
930
}
1435
return errno;
931
return 0;
1436
932
}
1437
933
1438
934
struct argp argp = { .options = options, .parser = parse_opt,
1439
935
.args_doc = "",
1440
936
.doc = "Mandos client -- Get and decrypt"
1441
937
" passwords from a Mandos server" };
1442
ret = argp_parse(&argp, argc, argv,
1443
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1444
switch(ret){
1445
case 0:
1446
break;
1447
case ENOMEM:
1448
default:
1449
errno = ret;
1450
perror_plus("argp_parse");
1451
exitcode = EX_OSERR;
1452
goto end;
1453
case EINVAL:
1454
exitcode = EX_USAGE;
1455
goto end;
1456
}
1457
}
1458
1459
{
1460
/* Work around Debian bug #633582:
1461
<http://bugs.debian.org/633582> */
1462
struct stat st;
1463
1464
/* Re-raise priviliges */
1465
errno = 0;
1466
ret = seteuid(0);
1467
if(ret == -1){
1468
perror_plus("seteuid");
1469
}
1470
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1474
} else {
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1476
if(ret == -1){
1477
perror_plus("fstat");
1478
} else {
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1481
if(ret == -1){
1482
perror_plus("fchown");
1483
}
1484
}
1485
}
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1487
}
1488
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1492
} else {
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1494
if(ret == -1){
1495
perror_plus("fstat");
1496
} else {
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1499
if(ret == -1){
1500
perror_plus("fchown");
1501
}
1502
}
1503
}
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1505
}
1506
1507
/* Lower privileges */
1508
errno = 0;
1509
ret = seteuid(uid);
1510
if(ret == -1){
1511
perror_plus("seteuid");
1512
}
1513
}
1514
1515
if(not debug){
1516
avahi_set_log_function(empty_log);
1517
}
1518
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1522
alphasort);
1523
if(ret >= 1){
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1526
if(debug){
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1528
}
1529
if(interface == NULL){
1530
perror_plus("malloc");
1531
free(direntries);
1532
exitcode = EXIT_FAILURE;
1533
goto end;
1534
}
1535
free(direntries);
1536
} else {
1537
free(direntries);
1538
fprintf(stderr, "Could not find a network interface\n");
938
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
939
if(ret == ARGP_ERR_UNKNOWN){
940
fprintf(stderr, "Unknown error while parsing arguments\n");
1539
941
exitcode = EXIT_FAILURE;
1540
942
goto end;
1541
943
}
1542
944
}
1543
945
1544
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
from the signal handler */
1546
/* Initialize the pseudo-RNG for Avahi */
1547
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1551
exitcode = EX_UNAVAILABLE;
1552
goto end;
1553
}
1554
1555
sigemptyset(&sigterm_action.sa_mask);
1556
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1557
if(ret == -1){
1558
perror_plus("sigaddset");
1559
exitcode = EX_OSERR;
1560
goto end;
1561
}
1562
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1563
if(ret == -1){
1564
perror_plus("sigaddset");
1565
exitcode = EX_OSERR;
1566
goto end;
1567
}
1568
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1569
if(ret == -1){
1570
perror_plus("sigaddset");
1571
exitcode = EX_OSERR;
1572
goto end;
1573
}
1574
/* Need to check if the handler is SIG_IGN before handling:
1575
| [[info:libc:Initial Signal Actions]] |
1576
| [[info:libc:Basic Signal Handling]] |
1577
*/
1578
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1579
if(ret == -1){
1580
perror_plus("sigaction");
1581
return EX_OSERR;
1582
}
1583
if(old_sigterm_action.sa_handler != SIG_IGN){
1584
ret = sigaction(SIGINT, &sigterm_action, NULL);
1585
if(ret == -1){
1586
perror_plus("sigaction");
1587
exitcode = EX_OSERR;
1588
goto end;
1589
}
1590
}
1591
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1592
if(ret == -1){
1593
perror_plus("sigaction");
1594
return EX_OSERR;
1595
}
1596
if(old_sigterm_action.sa_handler != SIG_IGN){
1597
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1598
if(ret == -1){
1599
perror_plus("sigaction");
1600
exitcode = EX_OSERR;
1601
goto end;
1602
}
1603
}
1604
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1605
if(ret == -1){
1606
perror_plus("sigaction");
1607
return EX_OSERR;
1608
}
1609
if(old_sigterm_action.sa_handler != SIG_IGN){
1610
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1611
if(ret == -1){
1612
perror_plus("sigaction");
1613
exitcode = EX_OSERR;
1614
goto end;
1615
}
1616
}
1617
1618
946
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1621
if(if_index == 0){
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1624
goto end;
1625
}
1626
1627
if(quit_now){
1628
goto end;
1629
}
1630
1631
/* Re-raise priviliges */
1632
errno = 0;
1633
ret = seteuid(0);
1634
if(ret == -1){
1635
perror_plus("seteuid");
1636
}
1637
947
{
1638
948
#ifdef __linux__
1639
949
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
950
messages to mess up the prompt */
1641
951
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1643
952
if(ret == -1){
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
953
perror("klogctl");
1646
954
}
1647
#endif /* __linux__ */
955
#endif
1648
956
1649
957
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1650
958
if(sd < 0){
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
959
perror("socket");
960
exitcode = EXIT_FAILURE;
1653
961
#ifdef __linux__
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1656
if(ret == -1){
1657
perror_plus("klogctl");
1658
}
1659
}
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1662
errno = 0;
1663
ret = seteuid(uid);
962
ret = klogctl(7, NULL, 0);
1664
963
if(ret == -1){
1665
perror_plus("seteuid");
964
perror("klogctl");
1666
965
}
966
#endif
1667
967
goto end;
1668
968
}
1669
969
strcpy(network.ifr_name, interface);
1670
970
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1671
971
if(ret == -1){
1672
perror_plus("ioctl SIOCGIFFLAGS");
972
perror("ioctl SIOCGIFFLAGS");
1673
973
#ifdef __linux__
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1676
if(ret == -1){
1677
perror_plus("klogctl");
1678
}
1679
}
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1683
errno = 0;
1684
ret = seteuid(uid);
974
ret = klogctl(7, NULL, 0);
1685
975
if(ret == -1){
1686
perror_plus("seteuid");
976
perror("klogctl");
1687
977
}
978
#endif
979
exitcode = EXIT_FAILURE;
1688
980
goto end;
1689
981
}
1690
982
if((network.ifr_flags & IFF_UP) == 0){
1691
983
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
984
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1694
985
if(ret == -1){
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
986
perror("ioctl SIOCSIFFLAGS");
987
exitcode = EXIT_FAILURE;
1698
988
#ifdef __linux__
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1701
if(ret == -1){
1702
perror_plus("klogctl");
1703
}
1704
}
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1707
errno = 0;
1708
ret = seteuid(uid);
989
ret = klogctl(7, NULL, 0);
1709
990
if(ret == -1){
1710
perror_plus("seteuid");
991
perror("klogctl");
1711
992
}
993
#endif
1712
994
goto end;
1713
995
}
1714
996
}
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
997
/* sleep checking until interface is running */
1717
998
for(int i=0; i < delay * 4; i++){
1718
999
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1719
1000
if(ret == -1){
1720
perror_plus("ioctl SIOCGIFFLAGS");
1001
perror("ioctl SIOCGIFFLAGS");
1721
1002
} else if(network.ifr_flags & IFF_RUNNING){
1722
1003
break;
1723
1004
}
1724
1005
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
1006
ret = nanosleep(&sleeptime, NULL);
1726
1007
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1008
perror("nanosleep");
1728
1009
}
1729
1010
}
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1733
if(ret == -1){
1734
perror_plus("close");
1735
}
1011
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1012
if(ret == -1){
1013
perror("close");
1736
1014
}
1737
1015
#ifdef __linux__
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1741
if(ret == -1){
1742
perror_plus("klogctl");
1743
}
1744
}
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1747
errno = 0;
1748
if(take_down_interface){
1749
/* Lower privileges */
1750
ret = seteuid(uid);
1751
if(ret == -1){
1752
perror_plus("seteuid");
1753
}
1754
} else {
1755
/* Lower privileges permanently */
1756
ret = setuid(uid);
1757
if(ret == -1){
1758
perror_plus("setuid");
1759
}
1760
}
1761
}
1762
1763
if(quit_now){
1764
goto end;
1765
}
1766
1767
ret = init_gnutls_global(pubkey, seckey);
1016
/* Restores kernel loglevel to default */
1017
ret = klogctl(7, NULL, 0);
1018
if(ret == -1){
1019
perror("klogctl");
1020
}
1021
#endif
1022
}
1023
1024
uid = getuid();
1025
gid = getgid();
1026
1027
setgid(gid);
1028
if(ret == -1){
1029
perror("setgid");
1030
}
1031
1032
ret = setuid(uid);
1033
if(ret == -1){
1034
perror("setuid");
1035
}
1036
1037
ret = init_gnutls_global(&mc, pubkey, seckey);
1768
1038
if(ret == -1){
1769
1039
fprintf(stderr, "init_gnutls_global failed\n");
1770
exitcode = EX_UNAVAILABLE;
1040
exitcode = EXIT_FAILURE;
1771
1041
goto end;
1772
1042
} else {
1773
1043
gnutls_initialized = true;
1774
1044
}
1775
1045
1776
if(quit_now){
1777
goto end;
1778
}
1779
1780
1046
if(mkdtemp(tempdir) == NULL){
1781
perror_plus("mkdtemp");
1047
perror("mkdtemp");
1782
1048
goto end;
1783
1049
}
1784
1050
tempdir_created = true;
1785
1051
1786
if(quit_now){
1787
goto end;
1788
}
1789
1790
if(not init_gpgme(pubkey, seckey, tempdir)){
1052
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1791
1053
fprintf(stderr, "init_gpgme failed\n");
1792
exitcode = EX_UNAVAILABLE;
1054
exitcode = EXIT_FAILURE;
1793
1055
goto end;
1794
1056
} else {
1795
1057
gpgme_initialized = true;
1796
1058
}
1797
1059
1798
if(quit_now){
1060
if_index = (AvahiIfIndex) if_nametoindex(interface);
1061
if(if_index == 0){
1062
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1063
exitcode = EXIT_FAILURE;
1799
1064
goto end;
1800
1065
}
1801
1066
1805
1070
char *address = strrchr(connect_to, ':');
1806
1071
if(address == NULL){
1807
1072
fprintf(stderr, "No colon in address\n");
1808
exitcode = EX_USAGE;
1809
goto end;
1810
}
1811
1812
if(quit_now){
1813
goto end;
1814
}
1815
1073
exitcode = EXIT_FAILURE;
1074
goto end;
1075
}
1816
1076
uint16_t port;
1817
errno = 0;
1818
tmpmax = strtoimax(address+1, &tmp, 10);
1819
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1820
or tmpmax != (uint16_t)tmpmax){
1077
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1078
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1079
or address[numchars+1] != '\0'){
1821
1080
fprintf(stderr, "Bad port number\n");
1822
exitcode = EX_USAGE;
1823
goto end;
1824
}
1825
1826
if(quit_now){
1827
goto end;
1828
}
1829
1081
exitcode = EXIT_FAILURE;
1082
goto end;
1083
}
1830
1084
port = (uint16_t)tmpmax;
1831
1085
*address = '\0';
1832
1086
address = connect_to;
1833
/* Colon in address indicates IPv6 */
1834
int af;
1835
if(strchr(address, ':') != NULL){
1836
af = AF_INET6;
1087
ret = start_mandos_communication(address, port, if_index, &mc);
1088
if(ret < 0){
1089
exitcode = EXIT_FAILURE;
1837
1090
} else {
1838
af = AF_INET;
1839
}
1840
1841
if(quit_now){
1842
goto end;
1843
}
1844
1845
while(not quit_now){
1846
ret = start_mandos_communication(address, port, if_index, af);
1847
if(quit_now or ret == 0){
1848
break;
1849
}
1850
sleep((int)retry_interval or 1);
1851
};
1852
1853
if (not quit_now){
1854
1091
exitcode = EXIT_SUCCESS;
1855
1092
}
1856
1857
1093
goto end;
1858
1094
}
1859
1095
1860
if(quit_now){
1096
if(not debug){
1097
avahi_set_log_function(empty_log);
1098
}
1099
1100
/* Initialize the pseudo-RNG for Avahi */
1101
srand((unsigned int) time(NULL));
1102
1103
/* Allocate main Avahi loop object */
1104
mc.simple_poll = avahi_simple_poll_new();
1105
if(mc.simple_poll == NULL){
1106
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1107
exitcode = EXIT_FAILURE;
1861
1108
goto end;
1862
1109
}
1863
1110
1883
1130
if(mc.server == NULL){
1884
1131
fprintf(stderr, "Failed to create Avahi server: %s\n",
1885
1132
avahi_strerror(error));
1886
exitcode = EX_UNAVAILABLE;
1887
goto end;
1888
}
1889
1890
if(quit_now){
1133
exitcode = EXIT_FAILURE;
1891
1134
goto end;
1892
1135
}
1893
1136
1894
1137
/* Create the Avahi service browser */
1895
1138
sb = avahi_s_service_browser_new(mc.server, if_index,
1896
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1897
NULL, 0, browse_callback, NULL);
1139
AVAHI_PROTO_INET6, "_mandos._tcp",
1140
NULL, 0, browse_callback, &mc);
1898
1141
if(sb == NULL){
1899
1142
fprintf(stderr, "Failed to create service browser: %s\n",
1900
1143
avahi_strerror(avahi_server_errno(mc.server)));
1901
exitcode = EX_UNAVAILABLE;
1902
goto end;
1903
}
1904
1905
if(quit_now){
1144
exitcode = EXIT_FAILURE;
1906
1145
goto end;
1907
1146
}
1908
1147
1911
1150
if(debug){
1912
1151
fprintf(stderr, "Starting Avahi loop search\n");
1913
1152
}
1914
1915
ret = avahi_loop_with_timeout(mc.simple_poll,
1916
(int)(retry_interval * 1000));
1917
if(debug){
1918
fprintf(stderr, "avahi_loop_with_timeout exited %s\n",
1919
(ret == 0) ? "successfully" : "with error");
1920
}
1153
1154
avahi_simple_poll_loop(mc.simple_poll);
1921
1155
1922
1156
end:
1923
1157
1944
1178
if(gpgme_initialized){
1945
1179
gpgme_release(mc.ctx);
1946
1180
}
1947
1948
/* Cleans up the circular linked list of Mandos servers the client
1949
has seen */
1950
if(mc.current_server != NULL){
1951
mc.current_server->prev->next = NULL;
1952
while(mc.current_server != NULL){
1953
server *next = mc.current_server->next;
1954
free(mc.current_server);
1955
mc.current_server = next;
1956
}
1957
}
1958
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1962
errno = 0;
1963
ret = seteuid(0);
1964
if(ret == -1){
1965
perror_plus("seteuid");
1966
}
1967
if(geteuid() == 0){
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1969
if(ret == -1){
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1974
if(ret == -1){
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1976
}
1977
}
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1979
if(ret == -1){
1980
perror_plus("close");
1981
}
1982
/* Lower privileges permanently */
1983
errno = 0;
1984
ret = setuid(uid);
1985
if(ret == -1){
1986
perror_plus("setuid");
1987
}
1988
}
1989
}
1990
1991
/* Removes the GPGME temp directory and all files inside */
1181
1182
/* Removes the temp directory used by GPGME */
1992
1183
if(tempdir_created){
1993
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1996
if (ret > 0){
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1184
DIR *d;
1185
struct dirent *direntry;
1186
d = opendir(tempdir);
1187
if(d == NULL){
1188
if(errno != ENOENT){
1189
perror("opendir");
1190
}
1191
} else {
1192
while(true){
1193
direntry = readdir(d);
1194
if(direntry == NULL){
1195
break;
1196
}
1197
/* Skip "." and ".." */
1198
if(direntry->d_name[0] == '.'
1199
and (direntry->d_name[1] == '\0'
1200
or (direntry->d_name[1] == '.'
1201
and direntry->d_name[2] == '\0'))){
1202
continue;
1203
}
1999
1204
char *fullname = NULL;
2000
1205
ret = asprintf(&fullname, "%s/%s", tempdir,
2001
1206
direntry->d_name);
2002
1207
if(ret < 0){
2003
perror_plus("asprintf");
1208
perror("asprintf");
2004
1209
continue;
2005
1210
}
2006
1211
ret = remove(fullname);
2010
1215
}
2011
1216
free(fullname);
2012
1217
}
2013
}
2014
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2016
specify */
2017
free(direntries);
2018
if (ret == -1){
2019
perror_plus("scandir");
1218
closedir(d);
2020
1219
}
2021
1220
ret = rmdir(tempdir);
2022
1221
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2024
}
2025
}
2026
2027
if(quit_now){
2028
sigemptyset(&old_sigterm_action.sa_mask);
2029
old_sigterm_action.sa_handler = SIG_DFL;
2030
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2031
&old_sigterm_action,
2032
NULL));
2033
if(ret == -1){
2034
perror_plus("sigaction");
2035
}
2036
do {
2037
ret = raise(signal_received);
2038
} while(ret != 0 and errno == EINTR);
2039
if(ret != 0){
2040
perror_plus("raise");
2041
abort();
2042
}
2043
TEMP_FAILURE_RETRY(pause());
1222
perror("rmdir");
1223
}
2044
1224
}
2045
1225
2046
1226
return exitcode;
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0