2
This file is part of avahi.
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avahi is free software; you can redistribute it and/or modify it
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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.
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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
1
/* -*- coding: utf-8 -*- */
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* Mandos client - get and decrypt data from a Mandos server
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* This program is partly derived from an example program for an Avahi
6
* service browser, downloaded from
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* <http://avahi.org/browser/examples/core-browse-services.c>. This
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* includes the following functions: "resolve_callback",
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* "browse_callback", and parts of "main".
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* 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>.
31
/* Needed by GPGME, specifically gpgme_data_seek() */
20
32
#define _LARGEFILE_SOURCE
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33
#define _FILE_OFFSET_BITS 64
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#include <net/if.h> /* if_nametoindex */
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#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 */
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#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
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#include <stdbool.h> /* bool, true */
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#include <string.h> /* memset(), strcmp(), strlen(),
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strerror(), asprintf(), strcpy() */
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#include <sys/ioctl.h> /* ioctl */
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#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
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sockaddr_in6, PF_INET6,
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SOCK_STREAM, INET6_ADDRSTRLEN,
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#include <inttypes.h> /* PRIu16 */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
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#include <assert.h> /* assert() */
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#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <iso646.h> /* not, and */
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#include <argp.h> /* struct argp_option, error_t, struct
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argp_state, struct argp,
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argp_parse(), ARGP_KEY_ARG,
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ARGP_KEY_END, ARGP_ERR_UNKNOWN */
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/* All Avahi types, constants and functions
29
76
#include <avahi-core/core.h>
30
77
#include <avahi-core/lookup.h>
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78
#include <avahi-core/log.h>
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80
#include <avahi-common/malloc.h>
34
81
#include <avahi-common/error.h>
37
#include <sys/types.h> /* socket(), setsockopt(), inet_pton() */
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#include <sys/socket.h> /* socket(), setsockopt(), struct sockaddr_in6, struct in6_addr, inet_pton() */
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#include <gnutls/gnutls.h> /* ALL GNUTLS STUFF */
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#include <gnutls/openpgp.h> /* gnutls with openpgp stuff */
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#include <unistd.h> /* close() */
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#include <netinet/in.h>
44
#include <stdbool.h> /* true */
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#include <string.h> /* memset */
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#include <arpa/inet.h> /* inet_pton() */
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#include <iso646.h> /* not */
50
#include <errno.h> /* perror() */
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#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
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#define CERTFILE CERT_ROOT "openpgp-client.txt"
60
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
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#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
87
init_gnutls_session(),
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#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
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GNUTLS_OPENPGP_FMT_BASE64 */
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#include <gpgme.h> /* All GPGME types, constants and
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GPGME_PROTOCOL_OpenPGP,
61
99
#define BUFFER_SIZE 256
64
101
bool debug = false;
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char *interface = "eth0";
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static const char *keydir = "/conf/conf.d/mandos";
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static const char mandos_protocol_version[] = "1";
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const char *argp_program_version = "password-request 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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/* Used for passing in values through the Avahi callback functions */
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gnutls_session_t session;
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AvahiSimplePoll *simple_poll;
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111
gnutls_certificate_credentials_t cred;
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unsigned int dh_bits;
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113
gnutls_dh_params_t dh_params;
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ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
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const char *priority;
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* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
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* "buffer_capacity" is how much is currently allocated,
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* "buffer_length" is how much is already used.
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size_t adjustbuffer(char **buffer, size_t buffer_length,
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size_t buffer_capacity){
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if (buffer_length + BUFFER_SIZE > buffer_capacity){
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*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
129
buffer_capacity += BUFFER_SIZE;
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return buffer_capacity;
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* Decrypt OpenPGP data using keyrings in HOMEDIR.
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* Returns -1 on error
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static ssize_t pgp_packet_decrypt (const char *cryptotext,
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const char *homedir){
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142
gpgme_data_t dh_crypto, dh_plain;
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size_t new_packet_capacity = 0;
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size_t new_packet_length = 0;
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size_t plaintext_capacity = 0;
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ssize_t plaintext_length = 0;
81
148
gpgme_engine_info_t engine_info;
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fprintf(stderr, "Attempting to decrypt password from gpg packet\n");
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fprintf(stderr, "Trying to decrypt OpenPGP data\n");
88
155
gpgme_check_version(NULL);
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gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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/* Set GPGME home directory */
163
/* Set GPGME home directory for the OpenPGP engine only */
92
164
rc = gpgme_get_engine_info (&engine_info);
93
165
if (rc != GPG_ERR_NO_ERROR){
94
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
163
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
164
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
165
244
fprintf(stderr, "Secret key available: %s\n",
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recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
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recipient->status == GPG_ERR_NO_SECKEY
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recipient = recipient->next;
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/* Delete the GPGME FILE pointer cryptotext data buffer */
174
gpgme_data_release(dh_crypto);
176
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
177
gpgme_data_seek(dh_plain, 0, SEEK_SET);
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if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
256
plaintext_length = -1;
181
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
182
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
183
if (*new_packet == NULL){
187
new_packet_capacity += BUFFER_SIZE;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
190
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
191
273
/* Print the data, if any */
193
/* If password is empty, then a incorrect error will be printed */
197
279
perror("gpgme_data_read");
280
plaintext_length = -1;
200
new_packet_length += ret;
283
plaintext_length += ret;
203
/* FIXME: check characters before printing to screen so to not print
204
terminal control characters */
206
/* fprintf(stderr, "decrypted password is: "); */
207
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
208
/* fprintf(stderr, "\n"); */
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");
296
/* Delete the GPGME cryptotext data buffer */
297
gpgme_data_release(dh_crypto);
211
299
/* Delete the GPGME plaintext data buffer */
212
300
gpgme_data_release(dh_plain);
213
return new_packet_length;
301
return plaintext_length;
216
304
static const char * safer_gnutls_strerror (int value) {
217
const char *ret = gnutls_strerror (value);
305
const char *ret = gnutls_strerror (value); /* Spurious warning */
219
307
ret = "(unknown)";
223
void debuggnutls(int level, const char* string){
224
fprintf(stderr, "%s", string);
311
/* GnuTLS log function callback */
312
static void debuggnutls(__attribute__((unused)) int level,
314
fprintf(stderr, "GnuTLS: %s", string);
227
int initgnutls(encrypted_session *es){
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
319
const char *seckeyfilename){
232
fprintf(stderr, "Initializing gnutls\n");
323
fprintf(stderr, "Initializing GnuTLS\n");
236
if ((ret = gnutls_global_init ())
237
!= GNUTLS_E_SUCCESS) {
238
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
326
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
334
/* "Use a log level over 10 to enable all debugging options."
243
337
gnutls_global_set_log_level(11);
244
338
gnutls_global_set_log_function(debuggnutls);
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));
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
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safer_gnutls_strerror(ret));
347
gnutls_global_deinit ();
256
fprintf(stderr, "Attempting to use openpgp certificate %s"
257
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
352
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
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" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
260
357
ret = gnutls_certificate_set_openpgp_key_file
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));
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);
311
426
/* ignore client certificate if any. */
312
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
427
gnutls_certificate_server_set_request (*session,
314
gnutls_dh_set_prime_bits (es->session, DH_BITS);
430
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
319
void empty_log(AvahiLogLevel level, const char *txt){}
435
/* Avahi log function callback */
436
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
437
__attribute__((unused)) const char *txt){}
321
int start_mandos_communication(char *ip, uint16_t port){
439
/* Called when a Mandos server is found */
440
static int start_mandos_communication(const char *ip, uint16_t port,
441
AvahiIfIndex if_index,
323
struct sockaddr_in6 to;
324
encrypted_session es;
444
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
325
445
char *buffer = NULL;
326
446
char *decrypted_buffer;
327
447
size_t buffer_length = 0;
328
448
size_t buffer_capacity = 0;
329
449
ssize_t decrypted_buffer_size;
452
char interface[IF_NAMESIZE];
453
gnutls_session_t session;
455
ret = init_gnutls_session (mc, &session);
333
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
461
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
336
465
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
472
if(if_indextoname((unsigned int)if_index, interface) == NULL){
473
perror("if_indextoname");
343
476
fprintf(stderr, "Binding to interface %s\n", interface);
346
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
348
perror("setsockopt bindtodevice");
352
memset(&to,0,sizeof(to));
353
to.sin6_family = AF_INET6;
354
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
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);
356
485
perror("inet_pton");
360
489
fprintf(stderr, "Bad address: %s\n", ip);
363
to.sin6_port = htons(port);
364
to.sin6_scope_id = if_nametoindex(interface);
492
to.in6.sin6_port = htons(port); /* Spurious warning */
494
to.in6.sin6_scope_id = (uint32_t)if_index;
367
fprintf(stderr, "Connection to: %s\n", ip);
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);
370
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
510
ret = connect(tcp_sd, &to.in, sizeof(to));
372
512
perror("connect");
376
ret = initgnutls (&es);
383
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){
386
fprintf(stderr, "Establishing tls session with %s\n", ip);
541
fprintf(stderr, "Establishing TLS session with %s\n", ip);
544
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
390
ret = gnutls_handshake (es.session);
547
ret = gnutls_handshake (session);
548
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
392
550
if (ret != GNUTLS_E_SUCCESS){
393
fprintf(stderr, "\n*** Handshake failed ***\n");
552
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
399
//Retrieve gpg packet that contains the wanted password
559
/* Read OpenPGP packet that contains the wanted password */
402
fprintf(stderr, "Retrieving pgp encrypted password from %s\n", ip);
562
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
406
if (buffer_length + BUFFER_SIZE > buffer_capacity){
407
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
412
buffer_capacity += BUFFER_SIZE;
567
buffer_capacity = adjustbuffer(&buffer, buffer_length,
569
if (buffer_capacity == 0){
570
perror("adjustbuffer");
415
ret = gnutls_record_recv
416
(es.session, buffer+buffer_length, BUFFER_SIZE);
575
ret = gnutls_record_recv(session, buffer+buffer_length,
423
583
case GNUTLS_E_AGAIN:
425
585
case GNUTLS_E_REHANDSHAKE:
426
ret = gnutls_handshake (es.session);
587
ret = gnutls_handshake (session);
588
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
428
fprintf(stderr, "\n*** Handshake failed ***\n");
590
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
429
591
gnutls_perror (ret);
435
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
597
fprintf(stderr, "Unknown error while reading data from"
598
" encrypted session with Mandos server\n");
437
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
600
gnutls_bye (session, GNUTLS_SHUT_RDWR);
441
buffer_length += ret;
604
buffer_length += (size_t) ret;
609
fprintf(stderr, "Closing TLS session\n");
612
gnutls_bye (session, GNUTLS_SHUT_RDWR);
445
614
if (buffer_length > 0){
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);
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;
448
635
free(decrypted_buffer);
457
fprintf(stderr, "Closing tls session\n");
641
/* Shutdown procedure */
461
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
464
gnutls_deinit (es.session);
465
gnutls_certificate_free_credentials (es.cred);
466
gnutls_global_deinit ();
646
gnutls_deinit (session);
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;
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[]){
560
760
AvahiSServiceBrowser *sb = NULL;
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);
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;
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 },
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);
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;
590
967
avahi_set_log_function(empty_log);
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;
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;
630
1020
/* Run the main loop */
633
fprintf(stderr, "Starting avahi loop search\n");
1023
fprintf(stderr, "Starting Avahi loop search\n");
636
avahi_simple_poll_loop(simple_poll);
1026
avahi_simple_poll_loop(mc.simple_poll);
641
1031
fprintf(stderr, "%s exiting\n", argv[0]);
644
1034
/* Cleanup things */
646
1036
avahi_s_service_browser_free(sb);
649
avahi_server_free(server);
652
avahi_simple_poll_free(simple_poll);
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 ();