31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
47
srand(), strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
44
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
68
SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
91
/* All Avahi types, constants and functions
47
94
#include <avahi-core/core.h>
48
95
#include <avahi-core/lookup.h>
49
96
#include <avahi-core/log.h>
108
* Decrypt OpenPGP data using keyrings in HOMEDIR.
109
* Returns -1 on error
111
static ssize_t pgp_packet_decrypt (const char *cryptotext,
114
const char *homedir){
115
gpgme_data_t dh_crypto, dh_plain;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
117
172
gpgme_error_t rc;
119
size_t plaintext_capacity = 0;
120
ssize_t plaintext_length = 0;
121
173
gpgme_engine_info_t engine_info;
124
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
177
* Helper function to insert pub and seckey to the engine keyring.
179
bool import_key(const char *filename){
182
gpgme_data_t pgp_data;
184
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
190
rc = gpgme_data_new_from_fd(&pgp_data, fd);
191
if(rc != GPG_ERR_NO_ERROR){
192
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
193
gpgme_strsource(rc), gpgme_strerror(rc));
197
rc = gpgme_op_import(mc.ctx, pgp_data);
198
if(rc != GPG_ERR_NO_ERROR){
199
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
200
gpgme_strsource(rc), gpgme_strerror(rc));
204
ret = (int)TEMP_FAILURE_RETRY(close(fd));
208
gpgme_data_release(pgp_data);
213
fprintf(stderr, "Initializing GPGME\n");
128
217
gpgme_check_version(NULL);
129
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
130
if (rc != GPG_ERR_NO_ERROR){
219
if(rc != GPG_ERR_NO_ERROR){
131
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
132
221
gpgme_strsource(rc), gpgme_strerror(rc));
136
/* Set GPGME home directory for the OpenPGP engine only */
137
rc = gpgme_get_engine_info (&engine_info);
138
if (rc != GPG_ERR_NO_ERROR){
225
/* Set GPGME home directory for the OpenPGP engine only */
226
rc = gpgme_get_engine_info(&engine_info);
227
if(rc != GPG_ERR_NO_ERROR){
139
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
140
229
gpgme_strsource(rc), gpgme_strerror(rc));
143
232
while(engine_info != NULL){
144
233
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
145
234
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
146
engine_info->file_name, homedir);
235
engine_info->file_name, tempdir);
149
238
engine_info = engine_info->next;
151
240
if(engine_info == NULL){
152
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
241
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
245
/* Create new GPGME "context" */
246
rc = gpgme_new(&(mc.ctx));
247
if(rc != GPG_ERR_NO_ERROR){
248
fprintf(stderr, "bad gpgme_new: %s: %s\n",
249
gpgme_strsource(rc), gpgme_strerror(rc));
253
if(not import_key(pubkey) or not import_key(seckey)){
261
* Decrypt OpenPGP data.
262
* Returns -1 on error
264
static ssize_t pgp_packet_decrypt(const char *cryptotext,
267
gpgme_data_t dh_crypto, dh_plain;
270
size_t plaintext_capacity = 0;
271
ssize_t plaintext_length = 0;
274
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
156
277
/* Create new GPGME data buffer from memory cryptotext */
157
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
159
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
160
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
161
282
gpgme_strsource(rc), gpgme_strerror(rc));
312
423
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
fprintf (stderr, "GnuTLS memory error: %s\n",
316
safer_gnutls_strerror(ret));
424
gnutls_certificate_allocate_credentials(&mc.cred);
425
if(ret != GNUTLS_E_SUCCESS){
426
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
430
safer_gnutls_strerror(ret));
431
gnutls_global_deinit();
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
326
441
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
328
if (ret != GNUTLS_E_SUCCESS) {
442
(mc.cred, pubkeyfilename, seckeyfilename,
443
GNUTLS_OPENPGP_FMT_BASE64);
444
if(ret != GNUTLS_E_SUCCESS){
330
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
448
fprintf(stderr, "The GnuTLS error is: %s\n",
333
449
safer_gnutls_strerror(ret));
337
453
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(dh_params);
339
if (ret != GNUTLS_E_SUCCESS) {
340
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
" %s\n", safer_gnutls_strerror(ret));
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
safer_gnutls_strerror(ret));
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
454
ret = gnutls_dh_params_init(&mc.dh_params);
455
if(ret != GNUTLS_E_SUCCESS){
456
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
457
" %s\n", safer_gnutls_strerror(ret));
460
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
461
if(ret != GNUTLS_E_SUCCESS){
462
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
463
safer_gnutls_strerror(ret));
467
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
473
gnutls_certificate_free_credentials(mc.cred);
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
479
static int init_gnutls_session(gnutls_session_t *session){
353
481
/* GnuTLS session creation */
354
ret = gnutls_init(session, GNUTLS_SERVER);
355
if (ret != GNUTLS_E_SUCCESS){
483
ret = gnutls_init(session, GNUTLS_SERVER);
487
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
488
if(ret != GNUTLS_E_SUCCESS){
356
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
357
490
safer_gnutls_strerror(ret));
362
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
363
if (ret != GNUTLS_E_SUCCESS) {
496
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
498
gnutls_deinit(*session);
501
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
502
if(ret != GNUTLS_E_SUCCESS){
364
503
fprintf(stderr, "Syntax error at: %s\n", err);
365
504
fprintf(stderr, "GnuTLS error: %s\n",
366
505
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
371
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
373
if (ret != GNUTLS_E_SUCCESS) {
512
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
515
gnutls_deinit(*session);
518
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
519
if(ret != GNUTLS_E_SUCCESS){
374
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
375
521
safer_gnutls_strerror(ret));
522
gnutls_deinit(*session);
379
526
/* ignore client certificate if any. */
380
gnutls_certificate_server_set_request (*session,
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
383
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
392
538
/* Called when a Mandos server is found */
393
539
static int start_mandos_communication(const char *ip, uint16_t port,
394
540
AvahiIfIndex if_index,
397
struct sockaddr_in6 to;
542
int ret, tcp_sd = -1;
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
398
548
char *buffer = NULL;
399
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
400
550
size_t buffer_length = 0;
401
551
size_t buffer_capacity = 0;
402
ssize_t decrypted_buffer_size;
405
char interface[IF_NAMESIZE];
406
554
gnutls_session_t session;
407
gnutls_dh_params_t dh_params;
409
ret = initgnutls (mc, &session, &dh_params);
555
int pf; /* Protocol family */
569
fprintf(stderr, "Bad address family: %d\n", af);
573
ret = init_gnutls_session(&session);
415
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
419
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
421
585
perror("socket");
426
if(if_indextoname((unsigned int)if_index, interface) == NULL){
427
perror("if_indextoname");
430
fprintf(stderr, "Binding to interface %s\n", interface);
433
memset(&to,0,sizeof(to)); /* Spurious warning */
434
to.sin6_family = AF_INET6;
435
/* It would be nice to have a way to detect if we were passed an
436
IPv4 address here. Now we assume an IPv6 address. */
437
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
593
memset(&to, 0, sizeof(to));
595
to.in6.sin6_family = (sa_family_t)af;
596
ret = inet_pton(af, ip, &to.in6.sin6_addr);
598
to.in.sin_family = (sa_family_t)af;
599
ret = inet_pton(af, ip, &to.in.sin_addr);
439
602
perror("inet_pton");
443
606
fprintf(stderr, "Bad address: %s\n", ip);
446
to.sin6_port = htons(port); /* Spurious warning */
610
to.in6.sin6_port = htons(port); /* Spurious warnings from
612
-Wunreachable-code */
614
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
615
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
617
if(if_index == AVAHI_IF_UNSPEC){
618
fprintf(stderr, "An IPv6 link-local address is incomplete"
619
" without a network interface\n");
622
/* Set the network interface number as scope */
623
to.in6.sin6_scope_id = (uint32_t)if_index;
626
to.in.sin_port = htons(port); /* Spurious warnings from
628
-Wunreachable-code */
448
to.sin6_scope_id = (uint32_t)if_index;
451
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
452
char addrstr[INET6_ADDRSTRLEN] = "";
453
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
454
sizeof(addrstr)) == NULL){
636
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
637
char interface[IF_NAMESIZE];
638
if(if_indextoname((unsigned int)if_index, interface) == NULL){
639
perror("if_indextoname");
641
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
642
ip, interface, port);
645
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
648
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
649
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
652
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
655
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
455
659
perror("inet_ntop");
457
661
if(strcmp(addrstr, ip) != 0){
696
/* Combines file name and path and returns the malloced new
697
string. some sane checks could/should be added */
698
static const char *combinepath(const char *first, const char *second){
699
size_t f_len = strlen(first);
700
size_t s_len = strlen(second);
701
char *tmp = malloc(f_len + s_len + 2);
706
memcpy(tmp, first, f_len); /* Spurious warning */
710
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
712
tmp[f_len + 1 + s_len] = '\0';
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
980
* This function determines if a directory entry in /sys/class/net
981
* corresponds to an acceptable network device.
982
* (This function is passed to scandir(3) as a filter function.)
984
int good_interface(const struct dirent *if_entry){
986
char *flagname = NULL;
987
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
993
if(if_entry->d_name[0] == '.'){
996
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1001
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1002
/* read line from flags_fd */
1003
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1004
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1005
flagstring[(size_t)to_read] = '\0';
1006
if(flagstring == NULL){
1012
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1029
tmpmax = strtoimax(flagstring, &tmp, 0);
1030
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1031
and not (isspace(*tmp)))
1032
or tmpmax != (ifreq_flags)tmpmax){
1034
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1035
flagstring, if_entry->d_name);
1041
ifreq_flags flags = (ifreq_flags)tmpmax;
1042
/* Reject the loopback device */
1043
if(flags & IFF_LOOPBACK){
1045
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1050
/* Accept point-to-point devices only if connect_to is specified */
1051
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1053
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1058
/* Otherwise, reject non-broadcast-capable devices */
1059
if(not (flags & IFF_BROADCAST)){
1061
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1066
/* Accept this device */
1068
fprintf(stderr, "Interface \"%s\" is acceptable\n",
717
1074
int main(int argc, char *argv[]){
718
AvahiSServiceBrowser *sb = NULL;
721
int exitcode = EXIT_SUCCESS;
722
const char *interface = "eth0";
723
struct ifreq network;
725
char *connect_to = NULL;
726
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
727
mandos_context mc = { .simple_poll = NULL, .server = NULL,
728
.dh_bits = 1024, .priority = "SECURE256"};
731
/* Temporary int to get the address of for getopt_long */
732
int debug_int = debug ? 1 : 0;
734
struct option long_options[] = {
735
{"debug", no_argument, &debug_int, 1},
736
{"connect", required_argument, NULL, 'c'},
737
{"interface", required_argument, NULL, 'i'},
738
{"keydir", required_argument, NULL, 'd'},
739
{"seckey", required_argument, NULL, 's'},
740
{"pubkey", required_argument, NULL, 'p'},
741
{"dh-bits", required_argument, NULL, 'D'},
742
{"priority", required_argument, NULL, 'P'},
745
int option_index = 0;
746
ret = getopt_long (argc, argv, "i:", long_options,
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
780
mc.priority = optarg;
784
/* getopt_long() has already printed a message about the
785
unrcognized option, so just exit. */
789
/* Set the global debug flag from the temporary int */
790
debug = debug_int ? true : false;
793
pubkeyfile = combinepath(keydir, pubkeyfile);
794
if (pubkeyfile == NULL){
795
perror("combinepath");
796
exitcode = EXIT_FAILURE;
800
seckeyfile = combinepath(keydir, seckeyfile);
801
if (seckeyfile == NULL){
802
perror("combinepath");
1075
AvahiSServiceBrowser *sb = NULL;
1080
int exitcode = EXIT_SUCCESS;
1081
const char *interface = "";
1082
struct ifreq network;
1084
bool take_down_interface = false;
1087
char tempdir[] = "/tmp/mandosXXXXXX";
1088
bool tempdir_created = false;
1089
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1090
const char *seckey = PATHDIR "/" SECKEY;
1091
const char *pubkey = PATHDIR "/" PUBKEY;
1093
bool gnutls_initialized = false;
1094
bool gpgme_initialized = false;
1097
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1098
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1103
/* Lower any group privileges we might have, just to be safe */
1110
/* Lower user privileges (temporarily) */
1122
struct argp_option options[] = {
1123
{ .name = "debug", .key = 128,
1124
.doc = "Debug mode", .group = 3 },
1125
{ .name = "connect", .key = 'c',
1126
.arg = "ADDRESS:PORT",
1127
.doc = "Connect directly to a specific Mandos server",
1129
{ .name = "interface", .key = 'i',
1131
.doc = "Network interface that will be used to search for"
1134
{ .name = "seckey", .key = 's',
1136
.doc = "OpenPGP secret key file base name",
1138
{ .name = "pubkey", .key = 'p',
1140
.doc = "OpenPGP public key file base name",
1142
{ .name = "dh-bits", .key = 129,
1144
.doc = "Bit length of the prime number used in the"
1145
" Diffie-Hellman key exchange",
1147
{ .name = "priority", .key = 130,
1149
.doc = "GnuTLS priority string for the TLS handshake",
1151
{ .name = "delay", .key = 131,
1153
.doc = "Maximum delay to wait for interface startup",
1158
error_t parse_opt(int key, char *arg,
1159
struct argp_state *state){
1161
case 128: /* --debug */
1164
case 'c': /* --connect */
1167
case 'i': /* --interface */
1170
case 's': /* --seckey */
1173
case 'p': /* --pubkey */
1176
case 129: /* --dh-bits */
1178
tmpmax = strtoimax(arg, &tmp, 10);
1179
if(errno != 0 or tmp == arg or *tmp != '\0'
1180
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1181
fprintf(stderr, "Bad number of DH bits\n");
1184
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1186
case 130: /* --priority */
1189
case 131: /* --delay */
1191
delay = strtof(arg, &tmp);
1192
if(errno != 0 or tmp == arg or *tmp != '\0'){
1193
fprintf(stderr, "Bad delay\n");
1202
return ARGP_ERR_UNKNOWN;
1207
struct argp argp = { .options = options, .parser = parse_opt,
1209
.doc = "Mandos client -- Get and decrypt"
1210
" passwords from a Mandos server" };
1211
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1212
if(ret == ARGP_ERR_UNKNOWN){
1213
fprintf(stderr, "Unknown error while parsing arguments\n");
1214
exitcode = EXIT_FAILURE;
1220
avahi_set_log_function(empty_log);
1223
if(interface[0] == '\0'){
1224
struct dirent **direntries;
1225
ret = scandir(sys_class_net, &direntries, good_interface,
1228
/* Pick the first good interface */
1229
interface = strdup(direntries[0]->d_name);
1231
fprintf(stderr, "Using interface \"%s\"\n", interface);
1233
if(interface == NULL){
1236
exitcode = EXIT_FAILURE;
1242
fprintf(stderr, "Could not find a network interface\n");
1243
exitcode = EXIT_FAILURE;
1248
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1249
from the signal handler */
1250
/* Initialize the pseudo-RNG for Avahi */
1251
srand((unsigned int) time(NULL));
1252
mc.simple_poll = avahi_simple_poll_new();
1253
if(mc.simple_poll == NULL){
1254
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1255
exitcode = EXIT_FAILURE;
1259
sigemptyset(&sigterm_action.sa_mask);
1260
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1262
perror("sigaddset");
1263
exitcode = EXIT_FAILURE;
1266
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1268
perror("sigaddset");
1269
exitcode = EXIT_FAILURE;
1272
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1274
perror("sigaddset");
1275
exitcode = EXIT_FAILURE;
1278
/* Need to check if the handler is SIG_IGN before handling:
1279
| [[info:libc:Initial Signal Actions]] |
1280
| [[info:libc:Basic Signal Handling]] |
1282
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1284
perror("sigaction");
1285
return EXIT_FAILURE;
1287
if(old_sigterm_action.sa_handler != SIG_IGN){
1288
ret = sigaction(SIGINT, &sigterm_action, NULL);
1290
perror("sigaction");
1291
exitcode = EXIT_FAILURE;
1295
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1297
perror("sigaction");
1298
return EXIT_FAILURE;
1300
if(old_sigterm_action.sa_handler != SIG_IGN){
1301
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1303
perror("sigaction");
1304
exitcode = EXIT_FAILURE;
1308
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1310
perror("sigaction");
1311
return EXIT_FAILURE;
1313
if(old_sigterm_action.sa_handler != SIG_IGN){
1314
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1316
perror("sigaction");
1317
exitcode = EXIT_FAILURE;
1322
/* If the interface is down, bring it up */
1323
if(strcmp(interface, "none") != 0){
806
1324
if_index = (AvahiIfIndex) if_nametoindex(interface);
807
1325
if(if_index == 0){
808
1326
fprintf(stderr, "No such interface: \"%s\"\n", interface);
812
if(connect_to != NULL){
813
/* Connect directly, do not use Zeroconf */
814
/* (Mainly meant for debugging) */
815
char *address = strrchr(connect_to, ':');
817
fprintf(stderr, "No colon in address\n");
821
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
823
perror("Bad port number");
827
address = connect_to;
828
ret = start_mandos_communication(address, port, if_index, &mc);
836
/* If the interface is down, bring it up */
838
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
841
exitcode = EXIT_FAILURE;
844
strcpy(network.ifr_name, interface); /* Spurious warning */
845
ret = ioctl(sd, SIOCGIFFLAGS, &network);
847
perror("ioctl SIOCGIFFLAGS");
848
exitcode = EXIT_FAILURE;
851
if((network.ifr_flags & IFF_UP) == 0){
852
network.ifr_flags |= IFF_UP;
1327
exitcode = EXIT_FAILURE;
1335
/* Re-raise priviliges */
1343
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1344
messages to mess up the prompt */
1345
ret = klogctl(8, NULL, 5);
1346
bool restore_loglevel = true;
1348
restore_loglevel = false;
1351
#endif /* __linux__ */
1353
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1356
exitcode = EXIT_FAILURE;
1358
if(restore_loglevel){
1359
ret = klogctl(7, NULL, 0);
1364
#endif /* __linux__ */
1365
/* Lower privileges */
1373
strcpy(network.ifr_name, interface);
1374
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1376
perror("ioctl SIOCGIFFLAGS");
1378
if(restore_loglevel){
1379
ret = klogctl(7, NULL, 0);
1384
#endif /* __linux__ */
1385
exitcode = EXIT_FAILURE;
1386
/* Lower privileges */
1394
if((network.ifr_flags & IFF_UP) == 0){
1395
network.ifr_flags |= IFF_UP;
1396
take_down_interface = true;
1397
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1399
take_down_interface = false;
1400
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1401
exitcode = EXIT_FAILURE;
1403
if(restore_loglevel){
1404
ret = klogctl(7, NULL, 0);
1409
#endif /* __linux__ */
1410
/* Lower privileges */
1419
/* sleep checking until interface is running */
1420
for(int i=0; i < delay * 4; i++){
1421
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1423
perror("ioctl SIOCGIFFLAGS");
1424
} else if(network.ifr_flags & IFF_RUNNING){
1427
struct timespec sleeptime = { .tv_nsec = 250000000 };
1428
ret = nanosleep(&sleeptime, NULL);
1429
if(ret == -1 and errno != EINTR){
1430
perror("nanosleep");
1433
if(not take_down_interface){
1434
/* We won't need the socket anymore */
1435
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1441
if(restore_loglevel){
1442
/* Restores kernel loglevel to default */
1443
ret = klogctl(7, NULL, 0);
1448
#endif /* __linux__ */
1449
/* Lower privileges */
1451
if(take_down_interface){
1452
/* Lower privileges */
1458
/* Lower privileges permanently */
1470
ret = init_gnutls_global(pubkey, seckey);
1472
fprintf(stderr, "init_gnutls_global failed\n");
1473
exitcode = EXIT_FAILURE;
1476
gnutls_initialized = true;
1483
tempdir_created = true;
1484
if(mkdtemp(tempdir) == NULL){
1485
tempdir_created = false;
1494
if(not init_gpgme(pubkey, seckey, tempdir)){
1495
fprintf(stderr, "init_gpgme failed\n");
1496
exitcode = EXIT_FAILURE;
1499
gpgme_initialized = true;
1506
if(connect_to != NULL){
1507
/* Connect directly, do not use Zeroconf */
1508
/* (Mainly meant for debugging) */
1509
char *address = strrchr(connect_to, ':');
1510
if(address == NULL){
1511
fprintf(stderr, "No colon in address\n");
1512
exitcode = EXIT_FAILURE;
1522
tmpmax = strtoimax(address+1, &tmp, 10);
1523
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1524
or tmpmax != (uint16_t)tmpmax){
1525
fprintf(stderr, "Bad port number\n");
1526
exitcode = EXIT_FAILURE;
1534
port = (uint16_t)tmpmax;
1536
address = connect_to;
1537
/* Colon in address indicates IPv6 */
1539
if(strchr(address, ':') != NULL){
1549
ret = start_mandos_communication(address, port, if_index, af);
1551
exitcode = EXIT_FAILURE;
1553
exitcode = EXIT_SUCCESS;
1563
AvahiServerConfig config;
1564
/* Do not publish any local Zeroconf records */
1565
avahi_server_config_init(&config);
1566
config.publish_hinfo = 0;
1567
config.publish_addresses = 0;
1568
config.publish_workstation = 0;
1569
config.publish_domain = 0;
1571
/* Allocate a new server */
1572
mc.server = avahi_server_new(avahi_simple_poll_get
1573
(mc.simple_poll), &config, NULL,
1576
/* Free the Avahi configuration data */
1577
avahi_server_config_free(&config);
1580
/* Check if creating the Avahi server object succeeded */
1581
if(mc.server == NULL){
1582
fprintf(stderr, "Failed to create Avahi server: %s\n",
1583
avahi_strerror(error));
1584
exitcode = EXIT_FAILURE;
1592
/* Create the Avahi service browser */
1593
sb = avahi_s_service_browser_new(mc.server, if_index,
1594
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1595
NULL, 0, browse_callback, NULL);
1597
fprintf(stderr, "Failed to create service browser: %s\n",
1598
avahi_strerror(avahi_server_errno(mc.server)));
1599
exitcode = EXIT_FAILURE;
1607
/* Run the main loop */
1610
fprintf(stderr, "Starting Avahi loop search\n");
1613
avahi_simple_poll_loop(mc.simple_poll);
1618
fprintf(stderr, "%s exiting\n", argv[0]);
1621
/* Cleanup things */
1623
avahi_s_service_browser_free(sb);
1625
if(mc.server != NULL)
1626
avahi_server_free(mc.server);
1628
if(mc.simple_poll != NULL)
1629
avahi_simple_poll_free(mc.simple_poll);
1631
if(gnutls_initialized){
1632
gnutls_certificate_free_credentials(mc.cred);
1633
gnutls_global_deinit();
1634
gnutls_dh_params_deinit(mc.dh_params);
1637
if(gpgme_initialized){
1638
gpgme_release(mc.ctx);
1641
/* Take down the network interface */
1642
if(take_down_interface){
1643
/* Re-raise priviliges */
1650
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1652
perror("ioctl SIOCGIFFLAGS");
1653
} else if(network.ifr_flags & IFF_UP) {
1654
network.ifr_flags &= ~IFF_UP; /* clear flag */
853
1655
ret = ioctl(sd, SIOCSIFFLAGS, &network);
855
perror("ioctl SIOCSIFFLAGS");
856
exitcode = EXIT_FAILURE;
864
avahi_set_log_function(empty_log);
867
/* Initialize the pseudo-RNG for Avahi */
868
srand((unsigned int) time(NULL));
870
/* Allocate main Avahi loop object */
871
mc.simple_poll = avahi_simple_poll_new();
872
if (mc.simple_poll == NULL) {
873
fprintf(stderr, "Avahi: Failed to create simple poll"
875
exitcode = EXIT_FAILURE;
880
AvahiServerConfig config;
881
/* Do not publish any local Zeroconf records */
882
avahi_server_config_init(&config);
883
config.publish_hinfo = 0;
884
config.publish_addresses = 0;
885
config.publish_workstation = 0;
886
config.publish_domain = 0;
888
/* Allocate a new server */
889
mc.server = avahi_server_new(avahi_simple_poll_get
890
(mc.simple_poll), &config, NULL,
893
/* Free the Avahi configuration data */
894
avahi_server_config_free(&config);
897
/* Check if creating the Avahi server object succeeded */
898
if (mc.server == NULL) {
899
fprintf(stderr, "Failed to create Avahi server: %s\n",
900
avahi_strerror(error));
901
exitcode = EXIT_FAILURE;
905
/* Create the Avahi service browser */
906
sb = avahi_s_service_browser_new(mc.server, if_index,
908
"_mandos._tcp", NULL, 0,
909
browse_callback, &mc);
911
fprintf(stderr, "Failed to create service browser: %s\n",
912
avahi_strerror(avahi_server_errno(mc.server)));
913
exitcode = EXIT_FAILURE;
917
/* Run the main loop */
920
fprintf(stderr, "Starting Avahi loop search\n");
923
avahi_simple_poll_loop(mc.simple_poll);
928
fprintf(stderr, "%s exiting\n", argv[0]);
933
avahi_s_service_browser_free(sb);
935
if (mc.server != NULL)
936
avahi_server_free(mc.server);
938
if (mc.simple_poll != NULL)
939
avahi_simple_poll_free(mc.simple_poll);
1657
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1660
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1664
/* Lower privileges permanently */
1673
/* Removes the temp directory used by GPGME */
1674
if(tempdir_created){
1676
struct dirent *direntry;
1677
d = opendir(tempdir);
1679
if(errno != ENOENT){
1684
direntry = readdir(d);
1685
if(direntry == NULL){
1688
/* Skip "." and ".." */
1689
if(direntry->d_name[0] == '.'
1690
and (direntry->d_name[1] == '\0'
1691
or (direntry->d_name[1] == '.'
1692
and direntry->d_name[2] == '\0'))){
1695
char *fullname = NULL;
1696
ret = asprintf(&fullname, "%s/%s", tempdir,
1702
ret = remove(fullname);
1704
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1711
ret = rmdir(tempdir);
1712
if(ret == -1 and errno != ENOENT){
1718
sigemptyset(&old_sigterm_action.sa_mask);
1719
old_sigterm_action.sa_handler = SIG_DFL;
1720
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1721
&old_sigterm_action,
1724
perror("sigaction");
1727
ret = raise(signal_received);
1728
} while(ret != 0 and errno == EINTR);
1733
TEMP_FAILURE_RETRY(pause());