1
/* -*- coding: utf-8 -*- */
3
* Mandos client - get and decrypt data from a Mandos server
5
* This program is partly derived from an example program for an Avahi
6
* service browser, downloaded from
7
* <http://avahi.org/browser/examples/core-browse-services.c>. This
8
* includes the following functions: "resolve_callback",
9
* "browse_callback", and parts of "main".
12
* Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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* This program is free software: you can redistribute it and/or
15
* modify it under the terms of the GNU General Public License as
16
* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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* This program is distributed in the hope that it will be useful, but
20
* WITHOUT ANY WARRANTY; without even the implied warranty of
21
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
22
* General Public License for more details.
24
* You should have received a copy of the GNU General Public License
25
* along with this program. If not, see
26
* <http://www.gnu.org/licenses/>.
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* Contact the authors at <mandos@fukt.bsnet.se>.
2
This file is part of avahi.
4
avahi is free software; you can redistribute it and/or modify it
5
under the terms of the GNU Lesser General Public License as
6
published by the Free Software Foundation; either version 2.1 of the
7
License, or (at your option) any later version.
9
avahi is distributed in the hope that it will be useful, but WITHOUT
10
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
12
Public License for more details.
14
You should have received a copy of the GNU Lesser General Public
15
License along with avahi; if not, write to the Free Software
16
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
31
/* Needed by GPGME, specifically gpgme_data_seek() */
32
20
#define _LARGEFILE_SOURCE
33
21
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
39
#include <stdint.h> /* uint16_t, uint32_t */
40
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
struct in6_addr, inet_pton(),
56
#include <assert.h> /* assert() */
57
#include <errno.h> /* perror(), errno */
58
#include <time.h> /* time() */
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
60
SIOCSIFFLAGS, if_indextoname(),
61
if_nametoindex(), IF_NAMESIZE */
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
63
getuid(), getgid(), setuid(),
65
#include <netinet/in.h>
66
#include <arpa/inet.h> /* inet_pton(), htons */
67
#include <iso646.h> /* not, and */
68
#include <argp.h> /* struct argp_option, error_t, struct
69
argp_state, struct argp,
70
argp_parse(), ARGP_KEY_ARG,
71
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
74
/* All Avahi types, constants and functions
27
#include <net/if.h> /* if_nametoindex */
77
29
#include <avahi-core/core.h>
78
30
#include <avahi-core/lookup.h>
79
31
#include <avahi-core/log.h>
81
33
#include <avahi-common/malloc.h>
82
34
#include <avahi-common/error.h>
85
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
87
init_gnutls_session(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
93
#include <gpgme.h> /* All GPGME types, constants and functions
95
GPGME_PROTOCOL_OpenPGP,
37
#include <sys/types.h> /* socket(), setsockopt(), inet_pton() */
38
#include <sys/socket.h> /* socket(), setsockopt(), struct sockaddr_in6, struct in6_addr, inet_pton() */
39
#include <gnutls/gnutls.h> /* ALL GNUTLS STUFF */
40
#include <gnutls/openpgp.h> /* gnutls with openpgp stuff */
42
#include <unistd.h> /* close() */
43
#include <netinet/in.h>
44
#include <stdbool.h> /* true */
45
#include <string.h> /* memset */
46
#include <arpa/inet.h> /* inet_pton() */
47
#include <iso646.h> /* not */
50
#include <errno.h> /* perror() */
57
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
59
#define CERTFILE CERT_ROOT "openpgp-client.txt"
60
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
98
61
#define BUFFER_SIZE 256
100
64
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
102
static const char mandos_protocol_version[] = "1";
103
const char *argp_program_version = "password-request 1.0";
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
65
char *interface = "eth0";
106
/* Used for passing in values through the Avahi callback functions */
108
AvahiSimplePoll *simple_poll;
68
gnutls_session_t session;
110
69
gnutls_certificate_credentials_t cred;
111
unsigned int dh_bits;
112
70
gnutls_dh_params_t dh_params;
113
const char *priority;
117
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* "buffer_capacity" is how much is currently allocated,
119
* "buffer_length" is how much is already used.
121
size_t adjustbuffer(char **buffer, size_t buffer_length,
122
size_t buffer_capacity){
123
if (buffer_length + BUFFER_SIZE > buffer_capacity){
124
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
128
buffer_capacity += BUFFER_SIZE;
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return buffer_capacity;
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
140
const char *homedir){
74
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
141
75
gpgme_data_t dh_crypto, dh_plain;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
79
size_t new_packet_capacity = 0;
80
size_t new_packet_length = 0;
147
81
gpgme_engine_info_t engine_info;
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
84
fprintf(stderr, "Attempting to decrypt password from gpg packet\n");
154
88
gpgme_check_version(NULL);
155
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
156
if (rc != GPG_ERR_NO_ERROR){
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
158
gpgme_strsource(rc), gpgme_strerror(rc));
89
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
162
/* Set GPGME home directory for the OpenPGP engine only */
91
/* Set GPGME home directory */
163
92
rc = gpgme_get_engine_info (&engine_info);
164
93
if (rc != GPG_ERR_NO_ERROR){
165
94
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
310
/* GnuTLS log function callback */
311
static void debuggnutls(__attribute__((unused)) int level,
313
fprintf(stderr, "GnuTLS: %s", string);
223
void debuggnutls(int level, const char* string){
224
fprintf(stderr, "%s", string);
316
static int init_gnutls_global(mandos_context *mc,
317
const char *pubkeyfile,
318
const char *seckeyfile){
227
int initgnutls(encrypted_session *es){
322
fprintf(stderr, "Initializing GnuTLS\n");
232
fprintf(stderr, "Initializing gnutls\n");
325
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
327
fprintf (stderr, "GnuTLS global_init: %s\n",
328
safer_gnutls_strerror(ret));
236
if ((ret = gnutls_global_init ())
237
!= GNUTLS_E_SUCCESS) {
238
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
333
/* "Use a log level over 10 to enable all debugging options."
336
243
gnutls_global_set_log_level(11);
337
244
gnutls_global_set_log_function(debuggnutls);
340
/* OpenPGP credentials */
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n",
344
safer_gnutls_strerror(ret));
345
gnutls_global_deinit ();
248
/* openpgp credentials */
249
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
250
!= GNUTLS_E_SUCCESS) {
251
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
256
fprintf(stderr, "Attempting to use openpgp certificate %s"
257
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
355
260
ret = gnutls_certificate_set_openpgp_key_file
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
if (ret != GNUTLS_E_SUCCESS) {
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
362
safer_gnutls_strerror(ret));
366
/* GnuTLS server initialization */
367
ret = gnutls_dh_params_init(&mc->dh_params);
368
if (ret != GNUTLS_E_SUCCESS) {
369
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
370
" %s\n", safer_gnutls_strerror(ret));
373
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
376
safer_gnutls_strerror(ret));
380
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
386
gnutls_certificate_free_credentials(mc->cred);
387
gnutls_global_deinit();
392
static int init_gnutls_session(mandos_context *mc,
393
gnutls_session_t *session){
395
/* GnuTLS session creation */
396
ret = gnutls_init(session, GNUTLS_SERVER);
397
if (ret != GNUTLS_E_SUCCESS){
398
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
399
safer_gnutls_strerror(ret));
404
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
405
if (ret != GNUTLS_E_SUCCESS) {
406
fprintf(stderr, "Syntax error at: %s\n", err);
407
fprintf(stderr, "GnuTLS error: %s\n",
408
safer_gnutls_strerror(ret));
409
gnutls_deinit (*session);
414
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
416
if (ret != GNUTLS_E_SUCCESS) {
417
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
418
safer_gnutls_strerror(ret));
419
gnutls_deinit (*session);
261
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
262
if (ret != GNUTLS_E_SUCCESS) {
264
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
265
ret, CERTFILE, KEYFILE);
266
fprintf(stdout, "The Error is: %s\n",
267
safer_gnutls_strerror(ret));
271
//Gnutls server initialization
272
if ((ret = gnutls_dh_params_init (&es->dh_params))
273
!= GNUTLS_E_SUCCESS) {
274
fprintf (stderr, "Error in dh parameter initialization: %s\n",
275
safer_gnutls_strerror(ret));
279
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
280
!= GNUTLS_E_SUCCESS) {
281
fprintf (stderr, "Error in prime generation: %s\n",
282
safer_gnutls_strerror(ret));
286
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
288
// Gnutls session creation
289
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
290
!= GNUTLS_E_SUCCESS){
291
fprintf(stderr, "Error in gnutls session initialization: %s\n",
292
safer_gnutls_strerror(ret));
295
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
296
!= GNUTLS_E_SUCCESS) {
297
fprintf(stderr, "Syntax error at: %s\n", err);
298
fprintf(stderr, "Gnutls error: %s\n",
299
safer_gnutls_strerror(ret));
303
if ((ret = gnutls_credentials_set
304
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf(stderr, "Error setting a credentials set: %s\n",
307
safer_gnutls_strerror(ret));
423
311
/* ignore client certificate if any. */
424
gnutls_certificate_server_set_request (*session,
312
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
427
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
314
gnutls_dh_set_prime_bits (es->session, DH_BITS);
432
/* Avahi log function callback */
433
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
434
__attribute__((unused)) const char *txt){}
319
void empty_log(AvahiLogLevel level, const char *txt){}
436
/* Called when a Mandos server is found */
437
static int start_mandos_communication(const char *ip, uint16_t port,
438
AvahiIfIndex if_index,
321
int start_mandos_communication(char *ip, uint16_t port){
441
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
323
struct sockaddr_in6 to;
324
encrypted_session es;
442
325
char *buffer = NULL;
443
326
char *decrypted_buffer;
444
327
size_t buffer_length = 0;
445
328
size_t buffer_capacity = 0;
446
329
ssize_t decrypted_buffer_size;
449
char interface[IF_NAMESIZE];
450
gnutls_session_t session;
452
ret = init_gnutls_session (mc, &session);
458
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
333
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
462
336
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
469
if(if_indextoname((unsigned int)if_index, interface) == NULL){
470
perror("if_indextoname");
473
343
fprintf(stderr, "Binding to interface %s\n", interface);
346
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
348
perror("setsockopt bindtodevice");
476
memset(&to,0,sizeof(to)); /* Spurious warning */
477
to.in6.sin6_family = AF_INET6;
478
/* It would be nice to have a way to detect if we were passed an
479
IPv4 address here. Now we assume an IPv6 address. */
480
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
352
memset(&to,0,sizeof(to));
353
to.sin6_family = AF_INET6;
354
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
482
356
perror("inet_pton");
486
360
fprintf(stderr, "Bad address: %s\n", ip);
489
to.in6.sin6_port = htons(port); /* Spurious warning */
491
to.in6.sin6_scope_id = (uint32_t)if_index;
363
to.sin6_port = htons(port);
364
to.sin6_scope_id = if_nametoindex(interface);
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
500
if(strcmp(addrstr, ip) != 0){
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
367
fprintf(stderr, "Connection to: %s\n", ip);
506
ret = connect(tcp_sd, &to.in, sizeof(to));
370
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
508
372
perror("connect");
376
ret = initgnutls (&es);
383
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
512
const char *out = mandos_protocol_version;
515
size_t out_size = strlen(out);
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
523
written += (size_t)ret;
524
if(written < out_size){
527
if (out == mandos_protocol_version){
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
386
fprintf(stderr, "Establishing tls session with %s\n", ip);
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
ret = gnutls_handshake (session);
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
390
ret = gnutls_handshake (es.session);
546
392
if (ret != GNUTLS_E_SUCCESS){
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
393
fprintf(stderr, "\n*** Handshake failed ***\n");
555
/* Read OpenPGP packet that contains the wanted password */
399
//Retrieve gpg packet that contains the wanted password
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
402
fprintf(stderr, "Retrieving pgp encrypted password from %s\n", ip);
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
406
if (buffer_length + BUFFER_SIZE > buffer_capacity){
407
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
412
buffer_capacity += BUFFER_SIZE;
571
ret = gnutls_record_recv(session, buffer+buffer_length,
415
ret = gnutls_record_recv
416
(es.session, buffer+buffer_length, BUFFER_SIZE);
579
423
case GNUTLS_E_AGAIN:
581
425
case GNUTLS_E_REHANDSHAKE:
583
ret = gnutls_handshake (session);
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
426
ret = gnutls_handshake (es.session);
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
428
fprintf(stderr, "\n*** Handshake failed ***\n");
587
429
gnutls_perror (ret);
593
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
435
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
437
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
600
buffer_length += (size_t) ret;
441
buffer_length += ret;
605
fprintf(stderr, "Closing TLS session\n");
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
610
445
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
if (decrypted_buffer_size >= 0){
617
while(written < (size_t) decrypted_buffer_size){
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
621
if(ret == 0 and ferror(stdout)){
623
fprintf(stderr, "Error writing encrypted data: %s\n",
629
written += (size_t)ret;
446
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) >= 0){
447
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
631
448
free(decrypted_buffer);
637
/* Shutdown procedure */
457
fprintf(stderr, "Closing tls session\n");
461
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
642
gnutls_deinit (session);
464
gnutls_deinit (es.session);
465
gnutls_certificate_free_credentials (es.cred);
466
gnutls_global_deinit ();
646
static void resolve_callback(AvahiSServiceResolver *r,
647
AvahiIfIndex interface,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
649
AvahiResolverEvent event,
653
const char *host_name,
654
const AvahiAddress *address,
656
AVAHI_GCC_UNUSED AvahiStringList *txt,
657
AVAHI_GCC_UNUSED AvahiLookupResultFlags
660
mandos_context *mc = userdata;
661
assert(r); /* Spurious warning */
663
/* Called whenever a service has been resolved successfully or
668
case AVAHI_RESOLVER_FAILURE:
669
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
670
" of type '%s' in domain '%s': %s\n", name, type, domain,
671
avahi_strerror(avahi_server_errno(mc->server)));
674
case AVAHI_RESOLVER_FOUND:
676
char ip[AVAHI_ADDRESS_STR_MAX];
677
avahi_address_snprint(ip, sizeof(ip), address);
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
682
int ret = start_mandos_communication(ip, port, interface, mc);
688
avahi_s_service_resolver_free(r);
691
static void browse_callback( AvahiSServiceBrowser *b,
692
AvahiIfIndex interface,
693
AvahiProtocol protocol,
694
AvahiBrowserEvent event,
698
AVAHI_GCC_UNUSED AvahiLookupResultFlags
701
mandos_context *mc = userdata;
702
assert(b); /* Spurious warning */
704
/* Called whenever a new services becomes available on the LAN or
705
is removed from the LAN */
709
case AVAHI_BROWSER_FAILURE:
711
fprintf(stderr, "(Avahi browser) %s\n",
712
avahi_strerror(avahi_server_errno(mc->server)));
713
avahi_simple_poll_quit(mc->simple_poll);
716
case AVAHI_BROWSER_NEW:
717
/* We ignore the returned Avahi resolver object. In the callback
718
function we free it. If the Avahi server is terminated before
719
the callback function is called the Avahi server will free the
722
if (!(avahi_s_service_resolver_new(mc->server, interface,
723
protocol, name, type, domain,
724
AVAHI_PROTO_INET6, 0,
725
resolve_callback, mc)))
726
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
727
name, avahi_strerror(avahi_server_errno(mc->server)));
730
case AVAHI_BROWSER_REMOVE:
733
case AVAHI_BROWSER_ALL_FOR_NOW:
734
case AVAHI_BROWSER_CACHE_EXHAUSTED:
736
fprintf(stderr, "No Mandos server found, still searching...\n");
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
752
memcpy(tmp, first, f_len); /* Spurious warning */
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
tmp[f_len + 1 + s_len] = '\0';
763
int main(int argc, char *argv[]){
470
static AvahiSimplePoll *simple_poll = NULL;
471
static AvahiServer *server = NULL;
473
static void resolve_callback(
474
AvahiSServiceResolver *r,
475
AVAHI_GCC_UNUSED AvahiIfIndex interface,
476
AVAHI_GCC_UNUSED AvahiProtocol protocol,
477
AvahiResolverEvent event,
481
const char *host_name,
482
const AvahiAddress *address,
484
AvahiStringList *txt,
485
AvahiLookupResultFlags flags,
486
AVAHI_GCC_UNUSED void* userdata) {
490
/* Called whenever a service has been resolved successfully or timed out */
493
case AVAHI_RESOLVER_FAILURE:
494
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
497
case AVAHI_RESOLVER_FOUND: {
498
char ip[AVAHI_ADDRESS_STR_MAX];
499
avahi_address_snprint(ip, sizeof(ip), address);
501
fprintf(stderr, "Mandos server found at %s on port %d\n", ip, port);
503
int ret = start_mandos_communication(ip, port);
511
avahi_s_service_resolver_free(r);
514
static void browse_callback(
515
AvahiSServiceBrowser *b,
516
AvahiIfIndex interface,
517
AvahiProtocol protocol,
518
AvahiBrowserEvent event,
522
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
525
AvahiServer *s = userdata;
528
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
532
case AVAHI_BROWSER_FAILURE:
534
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
535
avahi_simple_poll_quit(simple_poll);
538
case AVAHI_BROWSER_NEW:
539
/* We ignore the returned resolver object. In the callback
540
function we free it. If the server is terminated before
541
the callback function is called the server will free
542
the resolver for us. */
544
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
545
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
549
case AVAHI_BROWSER_REMOVE:
552
case AVAHI_BROWSER_ALL_FOR_NOW:
553
case AVAHI_BROWSER_CACHE_EXHAUSTED:
558
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
559
AvahiServerConfig config;
764
560
AvahiSServiceBrowser *sb = NULL;
767
int exitcode = EXIT_SUCCESS;
768
const char *interface = "eth0";
769
struct ifreq network;
773
char *connect_to = NULL;
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
778
.dh_bits = 1024, .priority = "SECURE256"};
779
bool gnutls_initalized = false;
782
struct argp_option options[] = {
783
{ .name = "debug", .key = 128,
784
.doc = "Debug mode", .group = 3 },
785
{ .name = "connect", .key = 'c',
787
.doc = "Connect directly to a sepcified mandos server",
789
{ .name = "interface", .key = 'i',
791
.doc = "Interface that Avahi will conntect through",
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory where the openpgp keyring is",
797
{ .name = "seckey", .key = 's',
799
.doc = "Secret openpgp key for gnutls authentication",
801
{ .name = "pubkey", .key = 'p',
803
.doc = "Public openpgp key for gnutls authentication",
805
{ .name = "dh-bits", .key = 129,
807
.doc = "dh-bits to use in gnutls communication",
809
{ .name = "priority", .key = 130,
811
.doc = "GNUTLS priority", .group = 1 },
816
error_t parse_opt (int key, char *arg,
817
struct argp_state *state) {
818
/* Get the INPUT argument from `argp_parse', which we know is
819
a pointer to our plugin list pointer. */
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unkown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
fprintf(stderr, "init_gnutls_global\n");
891
gnutls_initalized = true;
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
913
if(connect_to != NULL){
914
/* Connect directly, do not use Zeroconf */
915
/* (Mainly meant for debugging) */
916
char *address = strrchr(connect_to, ':');
918
fprintf(stderr, "No colon in address\n");
919
exitcode = EXIT_FAILURE;
923
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
925
perror("Bad port number");
926
exitcode = EXIT_FAILURE;
930
address = connect_to;
931
ret = start_mandos_communication(address, port, if_index, &mc);
933
exitcode = EXIT_FAILURE;
935
exitcode = EXIT_SUCCESS;
940
/* If the interface is down, bring it up */
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
945
exitcode = EXIT_FAILURE;
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
563
int returncode = EXIT_SUCCESS;
566
static struct option long_options[] = {
567
{"debug", no_argument, (int *)&debug, 1},
568
{"interface", required_argument, 0, 'i'},
571
int option_index = 0;
572
ret = getopt_long (argc, argv, "i:", long_options, &option_index);
968
590
avahi_set_log_function(empty_log);
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
979
exitcode = EXIT_FAILURE;
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
593
/* Initialize the psuedo-RNG */
596
/* Allocate main loop object */
597
if (!(simple_poll = avahi_simple_poll_new())) {
598
fprintf(stderr, "Failed to create simple poll object.\n");
603
/* Do not publish any local records */
604
avahi_server_config_init(&config);
605
config.publish_hinfo = 0;
606
config.publish_addresses = 0;
607
config.publish_workstation = 0;
608
config.publish_domain = 0;
610
/* Allocate a new server */
611
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
613
/* Free the configuration data */
614
avahi_server_config_free(&config);
616
/* Check if creating the server object succeeded */
618
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
619
returncode = EXIT_FAILURE;
623
/* Create the service browser */
624
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
625
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
626
returncode = EXIT_FAILURE;
1021
630
/* Run the main loop */
1024
fprintf(stderr, "Starting Avahi loop search\n");
633
fprintf(stderr, "Starting avahi loop search\n");
1027
avahi_simple_poll_loop(mc.simple_poll);
636
avahi_simple_poll_loop(simple_poll);
1032
641
fprintf(stderr, "%s exiting\n", argv[0]);
1035
644
/* Cleanup things */
1037
646
avahi_s_service_browser_free(sb);
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
649
avahi_server_free(server);
652
avahi_simple_poll_free(simple_poll);