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",
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* "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
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21
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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#include <stdio.h> /* fprintf(), stderr, fwrite(),
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#include <stdint.h> /* uint16_t, uint32_t */
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#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(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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SOCK_STREAM, INET6_ADDRSTRLEN,
51
#include <inttypes.h> /* PRIu16 */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
60
if_nametoindex(), IF_NAMESIZE */
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
67
#include <argp.h> /* struct argp_option, error_t, struct
68
argp_state, struct argp,
69
argp_parse(), ARGP_KEY_ARG,
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
73
/* All Avahi types, constants and functions
27
#include <net/if.h> /* if_nametoindex */
76
29
#include <avahi-core/core.h>
77
30
#include <avahi-core/lookup.h>
78
31
#include <avahi-core/log.h>
80
33
#include <avahi-common/malloc.h>
81
34
#include <avahi-common/error.h>
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
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
96
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() */
55
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
57
#define CERTFILE CERT_ROOT "openpgp-client.txt"
58
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
99
59
#define BUFFER_SIZE 256
101
62
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
107
/* Used for passing in values through the Avahi callback functions */
109
AvahiSimplePoll *simple_poll;
65
gnutls_session_t session;
111
66
gnutls_certificate_credentials_t cred;
112
unsigned int dh_bits;
113
67
gnutls_dh_params_t dh_params;
114
const char *priority;
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
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buffer_capacity += BUFFER_SIZE;
131
return buffer_capacity;
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
71
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
142
72
gpgme_data_t dh_crypto, dh_plain;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
76
size_t new_packet_capacity = 0;
77
size_t new_packet_length = 0;
148
78
gpgme_engine_info_t engine_info;
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
81
fprintf(stderr, "Attempting to decrypt password from gpg packet\n");
155
85
gpgme_check_version(NULL);
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
86
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
163
/* Set GPGME home directory for the OpenPGP engine only */
88
/* Set GPGME home directory */
164
89
rc = gpgme_get_engine_info (&engine_info);
165
90
if (rc != GPG_ERR_NO_ERROR){
166
91
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
242
160
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
161
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
162
fprintf(stderr, "Secret key available: %s\n",
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recipient->status == GPG_ERR_NO_SECKEY
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recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
247
164
recipient = recipient->next;
170
/* Delete the GPGME FILE pointer cryptotext data buffer */
171
gpgme_data_release(dh_crypto);
253
173
/* Seek back to the beginning of the GPGME plaintext data buffer */
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
256
plaintext_length = -1;
174
gpgme_data_seek(dh_plain, 0, SEEK_SET);
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
178
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
179
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
180
if (*new_packet == NULL){
184
new_packet_capacity += BUFFER_SIZE;
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
187
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
273
188
/* Print the data, if any */
190
/* If password is empty, then a incorrect error will be printed */
279
194
perror("gpgme_data_read");
280
plaintext_length = -1;
283
plaintext_length += ret;
197
new_packet_length += ret;
287
fprintf(stderr, "Decrypted password is: ");
288
for(ssize_t i = 0; i < plaintext_length; i++){
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
291
fprintf(stderr, "\n");
201
fprintf(stderr, "decrypted password is: %s\n", *new_packet);
296
/* Delete the GPGME cryptotext data buffer */
297
gpgme_data_release(dh_crypto);
299
/* Delete the GPGME plaintext data buffer */
204
/* Delete the GPGME plaintext data buffer */
300
205
gpgme_data_release(dh_plain);
301
return plaintext_length;
206
return new_packet_length;
304
209
static const char * safer_gnutls_strerror (int value) {
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
210
const char *ret = gnutls_strerror (value);
307
212
ret = "(unknown)";
311
/* GnuTLS log function callback */
312
static void debuggnutls(__attribute__((unused)) int level,
314
fprintf(stderr, "GnuTLS: %s", string);
216
void debuggnutls(int level, const char* string){
217
fprintf(stderr, "%s", string);
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
319
const char *seckeyfilename){
220
int initgnutls(encrypted_session *es){
323
fprintf(stderr, "Initializing GnuTLS\n");
225
fprintf(stderr, "Initializing gnutls\n");
326
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
229
if ((ret = gnutls_global_init ())
230
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
334
/* "Use a log level over 10 to enable all debugging options."
337
236
gnutls_global_set_log_level(11);
338
237
gnutls_global_set_log_function(debuggnutls);
341
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
346
safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
241
/* openpgp credentials */
242
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
243
!= GNUTLS_E_SUCCESS) {
244
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
353
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
249
fprintf(stderr, "Attempting to use openpgp certificate %s"
250
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
357
253
ret = gnutls_certificate_set_openpgp_key_file
358
(mc->cred, pubkeyfilename, seckeyfilename,
359
GNUTLS_OPENPGP_FMT_BASE64);
360
if (ret != GNUTLS_E_SUCCESS) {
362
"Error[%d] while reading the OpenPGP key pair ('%s',"
363
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
364
fprintf(stdout, "The GnuTLS error is: %s\n",
365
safer_gnutls_strerror(ret));
369
/* GnuTLS server initialization */
370
ret = gnutls_dh_params_init(&mc->dh_params);
371
if (ret != GNUTLS_E_SUCCESS) {
372
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
373
" %s\n", safer_gnutls_strerror(ret));
376
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
379
safer_gnutls_strerror(ret));
383
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
389
gnutls_certificate_free_credentials(mc->cred);
390
gnutls_global_deinit();
395
static int init_gnutls_session(mandos_context *mc,
396
gnutls_session_t *session){
398
/* GnuTLS session creation */
399
ret = gnutls_init(session, GNUTLS_SERVER);
400
if (ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
402
safer_gnutls_strerror(ret));
407
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
408
if (ret != GNUTLS_E_SUCCESS) {
409
fprintf(stderr, "Syntax error at: %s\n", err);
410
fprintf(stderr, "GnuTLS error: %s\n",
411
safer_gnutls_strerror(ret));
412
gnutls_deinit (*session);
417
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
419
if (ret != GNUTLS_E_SUCCESS) {
420
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
421
safer_gnutls_strerror(ret));
422
gnutls_deinit (*session);
254
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
255
if (ret != GNUTLS_E_SUCCESS) {
257
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
258
ret, CERTFILE, KEYFILE);
259
fprintf(stdout, "The Error is: %s\n",
260
safer_gnutls_strerror(ret));
264
//Gnutls server initialization
265
if ((ret = gnutls_dh_params_init (&es->dh_params))
266
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "Error in dh parameter initialization: %s\n",
268
safer_gnutls_strerror(ret));
272
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
273
!= GNUTLS_E_SUCCESS) {
274
fprintf (stderr, "Error in prime generation: %s\n",
275
safer_gnutls_strerror(ret));
279
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
281
// Gnutls session creation
282
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
283
!= GNUTLS_E_SUCCESS){
284
fprintf(stderr, "Error in gnutls session initialization: %s\n",
285
safer_gnutls_strerror(ret));
288
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
289
!= GNUTLS_E_SUCCESS) {
290
fprintf(stderr, "Syntax error at: %s\n", err);
291
fprintf(stderr, "Gnutls error: %s\n",
292
safer_gnutls_strerror(ret));
296
if ((ret = gnutls_credentials_set
297
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf(stderr, "Error setting a credentials set: %s\n",
300
safer_gnutls_strerror(ret));
426
304
/* ignore client certificate if any. */
427
gnutls_certificate_server_set_request (*session,
305
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
307
gnutls_dh_set_prime_bits (es->session, DH_BITS);
435
/* Avahi log function callback */
436
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
437
__attribute__((unused)) const char *txt){}
312
void empty_log(AvahiLogLevel level, const char *txt){}
439
/* Called when a Mandos server is found */
440
static int start_mandos_communication(const char *ip, uint16_t port,
441
AvahiIfIndex if_index,
314
int start_mandos_communcation(char *ip, uint16_t port){
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
316
struct sockaddr_in6 to;
317
struct in6_addr ip_addr;
318
encrypted_session es;
445
319
char *buffer = NULL;
446
320
char *decrypted_buffer;
447
321
size_t buffer_length = 0;
448
322
size_t buffer_capacity = 0;
449
323
ssize_t decrypted_buffer_size;
452
char interface[IF_NAMESIZE];
453
gnutls_session_t session;
455
ret = init_gnutls_session (mc, &session);
325
const char interface[] = "eth0";
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
328
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
465
331
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
476
338
fprintf(stderr, "Binding to interface %s\n", interface);
341
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
343
perror("setsockopt bindtodevice");
479
memset(&to, 0, sizeof(to));
480
to.in6.sin6_family = AF_INET6;
481
/* It would be nice to have a way to detect if we were passed an
482
IPv4 address here. Now we assume an IPv6 address. */
483
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
347
memset(&to,0,sizeof(to));
348
to.sin6_family = AF_INET6;
349
ret = inet_pton(AF_INET6, ip, &ip_addr);
485
351
perror("inet_pton");
489
355
fprintf(stderr, "Bad address: %s\n", ip);
492
to.in6.sin6_port = htons(port); /* Spurious warning */
494
to.in6.sin6_scope_id = (uint32_t)if_index;
358
to.sin6_port = htons(port);
359
to.sin6_scope_id = if_nametoindex(interface);
497
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
499
char addrstr[INET6_ADDRSTRLEN] = "";
500
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
501
sizeof(addrstr)) == NULL){
504
if(strcmp(addrstr, ip) != 0){
505
fprintf(stderr, "Canonical address form: %s\n", addrstr);
362
fprintf(stderr, "Connection to: %s\n", ip);
510
ret = connect(tcp_sd, &to.in, sizeof(to));
365
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
512
367
perror("connect");
371
ret = initgnutls (&es);
378
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
516
const char *out = mandos_protocol_version;
519
size_t out_size = strlen(out);
520
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
521
out_size - written));
527
written += (size_t)ret;
528
if(written < out_size){
531
if (out == mandos_protocol_version){
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
381
fprintf(stderr, "Establishing tls session with %s\n", ip);
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
547
ret = gnutls_handshake (session);
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
385
ret = gnutls_handshake (es.session);
550
387
if (ret != GNUTLS_E_SUCCESS){
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
388
fprintf(stderr, "\n*** Handshake failed ***\n");
559
/* Read OpenPGP packet that contains the wanted password */
394
//Retrieve gpg packet that contains the wanted password
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
397
fprintf(stderr, "Retrieving pgp encrypted password from %s\n", ip);
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
401
if (buffer_length + BUFFER_SIZE > buffer_capacity){
402
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
407
buffer_capacity += BUFFER_SIZE;
575
ret = gnutls_record_recv(session, buffer+buffer_length,
410
ret = gnutls_record_recv
411
(es.session, buffer+buffer_length, BUFFER_SIZE);
583
418
case GNUTLS_E_AGAIN:
585
420
case GNUTLS_E_REHANDSHAKE:
587
ret = gnutls_handshake (session);
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
421
ret = gnutls_handshake (es.session);
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
423
fprintf(stderr, "\n*** Handshake failed ***\n");
591
424
gnutls_perror (ret);
597
fprintf(stderr, "Unknown error while reading data from"
598
" encrypted session with Mandos server\n");
430
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
432
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
604
buffer_length += (size_t) ret;
436
buffer_length += ret;
609
fprintf(stderr, "Closing TLS session\n");
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
614
440
if (buffer_length > 0){
615
decrypted_buffer_size = pgp_packet_decrypt(buffer,
619
if (decrypted_buffer_size >= 0){
621
while(written < (size_t) decrypted_buffer_size){
622
ret = (int)fwrite (decrypted_buffer + written, 1,
623
(size_t)decrypted_buffer_size - written,
625
if(ret == 0 and ferror(stdout)){
627
fprintf(stderr, "Error writing encrypted data: %s\n",
633
written += (size_t)ret;
441
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) >= 0){
442
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
635
443
free(decrypted_buffer);
641
/* Shutdown procedure */
452
fprintf(stderr, "Closing tls session\n");
456
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
646
gnutls_deinit (session);
459
gnutls_deinit (es.session);
460
gnutls_certificate_free_credentials (es.cred);
461
gnutls_global_deinit ();
650
static void resolve_callback(AvahiSServiceResolver *r,
651
AvahiIfIndex interface,
652
AVAHI_GCC_UNUSED AvahiProtocol protocol,
653
AvahiResolverEvent event,
657
const char *host_name,
658
const AvahiAddress *address,
660
AVAHI_GCC_UNUSED AvahiStringList *txt,
661
AVAHI_GCC_UNUSED AvahiLookupResultFlags
664
mandos_context *mc = userdata;
667
/* Called whenever a service has been resolved successfully or
672
case AVAHI_RESOLVER_FAILURE:
673
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
674
" of type '%s' in domain '%s': %s\n", name, type, domain,
675
avahi_strerror(avahi_server_errno(mc->server)));
678
case AVAHI_RESOLVER_FOUND:
680
char ip[AVAHI_ADDRESS_STR_MAX];
681
avahi_address_snprint(ip, sizeof(ip), address);
683
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
684
PRIu16 ") on port %d\n", name, host_name, ip,
687
int ret = start_mandos_communication(ip, port, interface, mc);
689
avahi_simple_poll_quit(mc->simple_poll);
693
avahi_s_service_resolver_free(r);
696
static void browse_callback( AvahiSServiceBrowser *b,
697
AvahiIfIndex interface,
698
AvahiProtocol protocol,
699
AvahiBrowserEvent event,
703
AVAHI_GCC_UNUSED AvahiLookupResultFlags
706
mandos_context *mc = userdata;
709
/* Called whenever a new services becomes available on the LAN or
710
is removed from the LAN */
714
case AVAHI_BROWSER_FAILURE:
716
fprintf(stderr, "(Avahi browser) %s\n",
717
avahi_strerror(avahi_server_errno(mc->server)));
718
avahi_simple_poll_quit(mc->simple_poll);
721
case AVAHI_BROWSER_NEW:
722
/* We ignore the returned Avahi resolver object. In the callback
723
function we free it. If the Avahi server is terminated before
724
the callback function is called the Avahi server will free the
727
if (!(avahi_s_service_resolver_new(mc->server, interface,
728
protocol, name, type, domain,
729
AVAHI_PROTO_INET6, 0,
730
resolve_callback, mc)))
731
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
732
name, avahi_strerror(avahi_server_errno(mc->server)));
735
case AVAHI_BROWSER_REMOVE:
738
case AVAHI_BROWSER_ALL_FOR_NOW:
739
case AVAHI_BROWSER_CACHE_EXHAUSTED:
741
fprintf(stderr, "No Mandos server found, still searching...\n");
747
/* Combines file name and path and returns the malloced new
748
string. some sane checks could/should be added */
749
static char *combinepath(const char *first, const char *second){
751
int ret = asprintf(&tmp, "%s/%s", first, second);
759
int main(int argc, char *argv[]){
465
static AvahiSimplePoll *simple_poll = NULL;
466
static AvahiServer *server = NULL;
468
static void resolve_callback(
469
AvahiSServiceResolver *r,
470
AVAHI_GCC_UNUSED AvahiIfIndex interface,
471
AVAHI_GCC_UNUSED AvahiProtocol protocol,
472
AvahiResolverEvent event,
476
const char *host_name,
477
const AvahiAddress *address,
479
AvahiStringList *txt,
480
AvahiLookupResultFlags flags,
481
AVAHI_GCC_UNUSED void* userdata) {
485
/* Called whenever a service has been resolved successfully or timed out */
488
case AVAHI_RESOLVER_FAILURE:
489
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)));
492
case AVAHI_RESOLVER_FOUND: {
493
char ip[AVAHI_ADDRESS_STR_MAX];
494
avahi_address_snprint(ip, sizeof(ip), address);
496
fprintf(stderr, "Mandos server found at %s on port %d\n", ip, port);
498
int ret = start_mandos_communcation(ip, port);
506
avahi_s_service_resolver_free(r);
509
static void browse_callback(
510
AvahiSServiceBrowser *b,
511
AvahiIfIndex interface,
512
AvahiProtocol protocol,
513
AvahiBrowserEvent event,
517
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
520
AvahiServer *s = userdata;
523
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
527
case AVAHI_BROWSER_FAILURE:
529
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
530
avahi_simple_poll_quit(simple_poll);
533
case AVAHI_BROWSER_NEW:
534
/* We ignore the returned resolver object. In the callback
535
function we free it. If the server is terminated before
536
the callback function is called the server will free
537
the resolver for us. */
539
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
540
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
544
case AVAHI_BROWSER_REMOVE:
547
case AVAHI_BROWSER_ALL_FOR_NOW:
548
case AVAHI_BROWSER_CACHE_EXHAUSTED:
553
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
554
AvahiServerConfig config;
760
555
AvahiSServiceBrowser *sb = NULL;
556
const char db[] = "--debug";
763
int exitcode = EXIT_SUCCESS;
764
const char *interface = "eth0";
765
struct ifreq network;
769
char *connect_to = NULL;
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
776
.dh_bits = 1024, .priority = "SECURE256"};
777
bool gnutls_initalized = false;
559
int returncode = EXIT_SUCCESS;
560
char *basename = rindex(argv[0], '/');
561
if(basename == NULL){
780
struct argp_option options[] = {
781
{ .name = "debug", .key = 128,
782
.doc = "Debug mode", .group = 3 },
783
{ .name = "connect", .key = 'c',
785
.doc = "Connect directly to a sepcified mandos server",
787
{ .name = "interface", .key = 'i',
789
.doc = "Interface that Avahi will conntect through",
791
{ .name = "keydir", .key = 'd',
793
.doc = "Directory where the openpgp keyring is",
795
{ .name = "seckey", .key = 's',
797
.doc = "Secret openpgp key for gnutls authentication",
799
{ .name = "pubkey", .key = 'p',
801
.doc = "Public openpgp key for gnutls authentication",
803
{ .name = "dh-bits", .key = 129,
805
.doc = "dh-bits to use in gnutls communication",
807
{ .name = "priority", .key = 130,
809
.doc = "GNUTLS priority", .group = 1 },
567
char *program_name = malloc(strlen(basename) + sizeof(db));
814
error_t parse_opt (int key, char *arg,
815
struct argp_state *state) {
816
/* Get the INPUT argument from `argp_parse', which we know is
817
a pointer to our plugin list pointer. */
839
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
569
if (program_name == NULL){
574
program_name[0] = '\0';
576
for (int i = 1; i < argc; i++){
577
if (not strncmp(argv[i], db, 5)){
578
strcat(strcat(strcat(program_name, db ), "="), basename);
579
if(not strcmp(argv[i], db) or not strcmp(argv[i], program_name)){
853
return ARGP_ERR_UNKNOWN;
858
struct argp argp = { .options = options, .parser = parse_opt,
860
.doc = "Mandos client -- Get and decrypt"
861
" passwords from mandos server" };
862
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
863
if (ret == ARGP_ERR_UNKNOWN){
864
fprintf(stderr, "Unknown error while parsing arguments\n");
865
exitcode = EXIT_FAILURE;
870
pubkeyfilename = combinepath(keydir, pubkeyname);
871
if (pubkeyfilename == NULL){
872
perror("combinepath");
873
exitcode = EXIT_FAILURE;
877
seckeyfilename = combinepath(keydir, seckeyname);
878
if (seckeyfilename == NULL){
879
perror("combinepath");
880
exitcode = EXIT_FAILURE;
884
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
886
fprintf(stderr, "init_gnutls_global failed\n");
887
exitcode = EXIT_FAILURE;
890
gnutls_initalized = true;
893
/* If the interface is down, bring it up */
895
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
898
exitcode = EXIT_FAILURE;
901
strcpy(network.ifr_name, interface);
902
ret = ioctl(sd, SIOCGIFFLAGS, &network);
904
perror("ioctl SIOCGIFFLAGS");
905
exitcode = EXIT_FAILURE;
908
if((network.ifr_flags & IFF_UP) == 0){
909
network.ifr_flags |= IFF_UP;
910
ret = ioctl(sd, SIOCSIFFLAGS, &network);
912
perror("ioctl SIOCSIFFLAGS");
913
exitcode = EXIT_FAILURE;
933
if_index = (AvahiIfIndex) if_nametoindex(interface);
935
fprintf(stderr, "No such interface: \"%s\"\n", interface);
939
if(connect_to != NULL){
940
/* Connect directly, do not use Zeroconf */
941
/* (Mainly meant for debugging) */
942
char *address = strrchr(connect_to, ':');
944
fprintf(stderr, "No colon in address\n");
945
exitcode = EXIT_FAILURE;
949
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
951
perror("Bad port number");
952
exitcode = EXIT_FAILURE;
956
address = connect_to;
957
ret = start_mandos_communication(address, port, if_index, &mc);
959
exitcode = EXIT_FAILURE;
961
exitcode = EXIT_SUCCESS;
967
587
avahi_set_log_function(empty_log);
970
/* Initialize the pseudo-RNG for Avahi */
971
srand((unsigned int) time(NULL));
973
/* Allocate main Avahi loop object */
974
mc.simple_poll = avahi_simple_poll_new();
975
if (mc.simple_poll == NULL) {
976
fprintf(stderr, "Avahi: Failed to create simple poll"
978
exitcode = EXIT_FAILURE;
983
AvahiServerConfig config;
984
/* Do not publish any local Zeroconf records */
985
avahi_server_config_init(&config);
986
config.publish_hinfo = 0;
987
config.publish_addresses = 0;
988
config.publish_workstation = 0;
989
config.publish_domain = 0;
991
/* Allocate a new server */
992
mc.server = avahi_server_new(avahi_simple_poll_get
993
(mc.simple_poll), &config, NULL,
996
/* Free the Avahi configuration data */
997
avahi_server_config_free(&config);
1000
/* Check if creating the Avahi server object succeeded */
1001
if (mc.server == NULL) {
1002
fprintf(stderr, "Failed to create Avahi server: %s\n",
1003
avahi_strerror(error));
1004
exitcode = EXIT_FAILURE;
1008
/* Create the Avahi service browser */
1009
sb = avahi_s_service_browser_new(mc.server, if_index,
1011
"_mandos._tcp", NULL, 0,
1012
browse_callback, &mc);
1014
fprintf(stderr, "Failed to create service browser: %s\n",
1015
avahi_strerror(avahi_server_errno(mc.server)));
1016
exitcode = EXIT_FAILURE;
590
/* Initialize the psuedo-RNG */
593
/* Allocate main loop object */
594
if (!(simple_poll = avahi_simple_poll_new())) {
595
fprintf(stderr, "Failed to create simple poll object.\n");
600
/* Do not publish any local records */
601
avahi_server_config_init(&config);
602
config.publish_hinfo = 0;
603
config.publish_addresses = 0;
604
config.publish_workstation = 0;
605
config.publish_domain = 0;
607
/* Allocate a new server */
608
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
610
/* Free the configuration data */
611
avahi_server_config_free(&config);
613
/* Check if creating the server object succeeded */
615
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
616
returncode = EXIT_FAILURE;
620
/* Create the service browser */
621
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
622
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
623
returncode = EXIT_FAILURE;
1020
627
/* Run the main loop */
1023
fprintf(stderr, "Starting Avahi loop search\n");
630
fprintf(stderr, "Starting avahi loop search\n");
1026
avahi_simple_poll_loop(mc.simple_poll);
633
avahi_simple_poll_loop(simple_poll);
1031
638
fprintf(stderr, "%s exiting\n", argv[0]);
1034
641
/* Cleanup things */
1036
643
avahi_s_service_browser_free(sb);
1038
if (mc.server != NULL)
1039
avahi_server_free(mc.server);
1041
if (mc.simple_poll != NULL)
1042
avahi_simple_poll_free(mc.simple_poll);
1043
free(pubkeyfilename);
1044
free(seckeyfilename);
1046
if (gnutls_initalized){
1047
gnutls_certificate_free_credentials(mc.cred);
1048
gnutls_global_deinit ();
646
avahi_server_free(server);
649
avahi_simple_poll_free(simple_poll);