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
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
37
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
39
44
#include <stdint.h> /* uint16_t, uint32_t */
40
45
#include <stddef.h> /* NULL, size_t, ssize_t */
41
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
#include <stdbool.h> /* bool, true */
47
srand(), strtof(), abort() */
48
#include <stdbool.h> /* bool, false, true */
44
49
#include <string.h> /* memset(), strcmp(), strlen(),
45
50
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
51
#include <sys/ioctl.h> /* ioctl */
47
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
53
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
#include <inttypes.h> /* PRIu16 */
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
52
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
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#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
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64
#include <assert.h> /* assert() */
56
65
#include <errno.h> /* perror(), errno */
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#include <time.h> /* time() */
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#include <time.h> /* nanosleep(), time() */
58
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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68
SIOCSIFFLAGS, if_indextoname(),
60
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
61
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
74
getuid(), getgid(), seteuid(),
65
76
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
77
#include <iso646.h> /* not, or, and */
67
78
#include <argp.h> /* struct argp_option, error_t, struct
68
79
argp_state, struct argp,
69
80
argp_parse(), ARGP_KEY_ARG,
70
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__ */
73
91
/* All Avahi types, constants and functions
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){
142
gpgme_data_t dh_crypto, dh_plain;
170
static bool init_gpgme(const char *seckey,
171
const char *pubkey, const char *tempdir){
144
172
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
173
gpgme_engine_info_t engine_info;
151
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");
155
217
gpgme_check_version(NULL);
156
218
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
157
if (rc != GPG_ERR_NO_ERROR){
219
if(rc != GPG_ERR_NO_ERROR){
158
220
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
221
gpgme_strsource(rc), gpgme_strerror(rc));
163
/* Set GPGME home directory for the OpenPGP engine only */
164
rc = gpgme_get_engine_info (&engine_info);
165
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){
166
228
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
229
gpgme_strsource(rc), gpgme_strerror(rc));
170
232
while(engine_info != NULL){
171
233
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
234
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
235
engine_info->file_name, tempdir);
176
238
engine_info = engine_info->next;
178
240
if(engine_info == NULL){
179
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");
183
277
/* Create new GPGME data buffer from memory cryptotext */
184
278
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
186
if (rc != GPG_ERR_NO_ERROR){
280
if(rc != GPG_ERR_NO_ERROR){
187
281
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
282
gpgme_strsource(rc), gpgme_strerror(rc));
341
423
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
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();
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
436
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
437
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
356
441
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
442
(mc.cred, pubkeyfilename, seckeyfilename,
358
443
GNUTLS_OPENPGP_FMT_BASE64);
359
if (ret != GNUTLS_E_SUCCESS) {
444
if(ret != GNUTLS_E_SUCCESS){
361
446
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
447
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
448
fprintf(stderr, "The GnuTLS error is: %s\n",
364
449
safer_gnutls_strerror(ret));
368
453
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
382
gnutls_certificate_set_dh_params(mc->cred, mc->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);
388
gnutls_certificate_free_credentials(mc->cred);
473
gnutls_certificate_free_credentials(mc.cred);
389
474
gnutls_global_deinit();
475
gnutls_dh_params_deinit(mc.dh_params);
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
479
static int init_gnutls_session(gnutls_session_t *session){
397
481
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
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){
400
489
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
490
safer_gnutls_strerror(ret));
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
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){
408
503
fprintf(stderr, "Syntax error at: %s\n", err);
409
504
fprintf(stderr, "GnuTLS error: %s\n",
410
505
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
506
gnutls_deinit(*session);
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
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){
419
520
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
420
521
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
522
gnutls_deinit(*session);
425
526
/* ignore client certificate if any. */
426
gnutls_certificate_server_set_request (*session,
527
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
429
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
529
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
438
538
/* Called when a Mandos server is found */
439
539
static int start_mandos_communication(const char *ip, uint16_t port,
440
540
AvahiIfIndex if_index,
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
542
int ret, tcp_sd = -1;
545
struct sockaddr_in in;
546
struct sockaddr_in6 in6;
444
548
char *buffer = NULL;
445
char *decrypted_buffer;
549
char *decrypted_buffer = NULL;
446
550
size_t buffer_length = 0;
447
551
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
451
char interface[IF_NAMESIZE];
452
554
gnutls_session_t session;
454
ret = init_gnutls_session (mc, &session);
555
int pf; /* Protocol family */
569
fprintf(stderr, "Bad address family: %d\n", af);
573
ret = init_gnutls_session(&session);
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
579
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
583
tcp_sd = socket(pf, SOCK_STREAM, 0);
466
585
perror("socket");
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
475
fprintf(stderr, "Binding to interface %s\n", interface);
478
memset(&to, 0, sizeof(to)); /* Spurious warning */
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.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);
484
602
perror("inet_pton");
488
606
fprintf(stderr, "Bad address: %s\n", ip);
491
to.in6.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 */
493
to.in6.sin6_scope_id = (uint32_t)if_index;
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
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,
501
659
perror("inet_ntop");
503
661
if(strcmp(addrstr, ip) != 0){
746
/* Combines file name and path and returns the malloced new
747
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
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);
1005
if(flagstring == NULL){
1011
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
750
int ret = asprintf(&tmp, "%s/%s", first, second);
1028
tmpmax = strtoimax(flagstring, &tmp, 0);
1029
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1030
and not (isspace(*tmp)))
1031
or tmpmax != (ifreq_flags)tmpmax){
1036
ifreq_flags flags = (ifreq_flags)tmpmax;
1037
/* Reject the loopback device */
1038
if(flags & IFF_LOOPBACK){
1041
/* Accept point-to-point devices only if connect_to is specified */
1042
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1045
/* Otherwise, reject non-broadcast-capable devices */
1046
if(not (flags & IFF_BROADCAST)){
1049
/* Accept this device */
758
1053
int main(int argc, char *argv[]){
759
AvahiSServiceBrowser *sb = NULL;
762
int exitcode = EXIT_SUCCESS;
763
const char *interface = "eth0";
764
struct ifreq network;
768
char *connect_to = NULL;
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
1054
AvahiSServiceBrowser *sb = NULL;
1059
int exitcode = EXIT_SUCCESS;
1060
const char *interface = "";
1061
struct ifreq network;
1063
bool take_down_interface = false;
1066
char tempdir[] = "/tmp/mandosXXXXXX";
1067
bool tempdir_created = false;
1068
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1069
const char *seckey = PATHDIR "/" SECKEY;
1070
const char *pubkey = PATHDIR "/" PUBKEY;
1072
bool gnutls_initialized = false;
1073
bool gpgme_initialized = false;
1076
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1077
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1082
/* Lower any group privileges we might have, just to be safe */
1089
/* Lower user privileges (temporarily) */
1101
struct argp_option options[] = {
1102
{ .name = "debug", .key = 128,
1103
.doc = "Debug mode", .group = 3 },
1104
{ .name = "connect", .key = 'c',
1105
.arg = "ADDRESS:PORT",
1106
.doc = "Connect directly to a specific Mandos server",
1108
{ .name = "interface", .key = 'i',
1110
.doc = "Network interface that will be used to search for"
1113
{ .name = "seckey", .key = 's',
1115
.doc = "OpenPGP secret key file base name",
1117
{ .name = "pubkey", .key = 'p',
1119
.doc = "OpenPGP public key file base name",
1121
{ .name = "dh-bits", .key = 129,
1123
.doc = "Bit length of the prime number used in the"
1124
" Diffie-Hellman key exchange",
1126
{ .name = "priority", .key = 130,
1128
.doc = "GnuTLS priority string for the TLS handshake",
1130
{ .name = "delay", .key = 131,
1132
.doc = "Maximum delay to wait for interface startup",
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
784
.doc = "Connect directly to a sepcified mandos server",
786
{ .name = "interface", .key = 'i',
788
.doc = "Interface that Avahi will conntect through",
790
{ .name = "keydir", .key = 'd',
792
.doc = "Directory where the openpgp keyring is",
794
{ .name = "seckey", .key = 's',
796
.doc = "Secret openpgp key for gnutls authentication",
798
{ .name = "pubkey", .key = 'p',
800
.doc = "Public openpgp key for gnutls authentication",
802
{ .name = "dh-bits", .key = 129,
804
.doc = "dh-bits to use in gnutls communication",
806
{ .name = "priority", .key = 130,
808
.doc = "GNUTLS priority", .group = 1 },
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
852
return ARGP_ERR_UNKNOWN;
1137
error_t parse_opt(int key, char *arg,
1138
struct argp_state *state){
1140
case 128: /* --debug */
1143
case 'c': /* --connect */
1146
case 'i': /* --interface */
1149
case 's': /* --seckey */
1152
case 'p': /* --pubkey */
1155
case 129: /* --dh-bits */
1157
tmpmax = strtoimax(arg, &tmp, 10);
1158
if(errno != 0 or tmp == arg or *tmp != '\0'
1159
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1160
fprintf(stderr, "Bad number of DH bits\n");
1163
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1165
case 130: /* --priority */
1168
case 131: /* --delay */
1170
delay = strtof(arg, &tmp);
1171
if(errno != 0 or tmp == arg or *tmp != '\0'){
1172
fprintf(stderr, "Bad delay\n");
1181
return ARGP_ERR_UNKNOWN;
1186
struct argp argp = { .options = options, .parser = parse_opt,
1188
.doc = "Mandos client -- Get and decrypt"
1189
" passwords from a Mandos server" };
1190
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1191
if(ret == ARGP_ERR_UNKNOWN){
1192
fprintf(stderr, "Unknown error while parsing arguments\n");
1193
exitcode = EXIT_FAILURE;
1199
avahi_set_log_function(empty_log);
857
struct argp argp = { .options = options, .parser = parse_opt,
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
1202
if(interface[0] == '\0'){
1203
struct dirent **direntries;
1204
ret = scandir(sys_class_net, &direntries, good_interface,
1207
/* Pick the first good interface */
1208
interface = strdup(direntries[0]->d_name);
1209
if(interface == NULL){
864
1212
exitcode = EXIT_FAILURE;
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
889
gnutls_initalized = true;
892
/* If the interface is down, bring it up */
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
exitcode = EXIT_FAILURE;
900
strcpy(network.ifr_name, interface); /* Spurious warning */
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
1218
fprintf(stderr, "Could not find a network interface\n");
1219
exitcode = EXIT_FAILURE;
1224
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1225
from the signal handler */
1226
/* Initialize the pseudo-RNG for Avahi */
1227
srand((unsigned int) time(NULL));
1228
mc.simple_poll = avahi_simple_poll_new();
1229
if(mc.simple_poll == NULL){
1230
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1231
exitcode = EXIT_FAILURE;
1235
sigemptyset(&sigterm_action.sa_mask);
1236
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1238
perror("sigaddset");
1239
exitcode = EXIT_FAILURE;
1242
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1244
perror("sigaddset");
1245
exitcode = EXIT_FAILURE;
1248
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1250
perror("sigaddset");
1251
exitcode = EXIT_FAILURE;
1254
/* Need to check if the handler is SIG_IGN before handling:
1255
| [[info:libc:Initial Signal Actions]] |
1256
| [[info:libc:Basic Signal Handling]] |
1258
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1260
perror("sigaction");
1261
return EXIT_FAILURE;
1263
if(old_sigterm_action.sa_handler != SIG_IGN){
1264
ret = sigaction(SIGINT, &sigterm_action, NULL);
1266
perror("sigaction");
1267
exitcode = EXIT_FAILURE;
1271
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1273
perror("sigaction");
1274
return EXIT_FAILURE;
1276
if(old_sigterm_action.sa_handler != SIG_IGN){
1277
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1279
perror("sigaction");
1280
exitcode = EXIT_FAILURE;
1284
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1286
perror("sigaction");
1287
return EXIT_FAILURE;
1289
if(old_sigterm_action.sa_handler != SIG_IGN){
1290
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1292
perror("sigaction");
1293
exitcode = EXIT_FAILURE;
1298
/* If the interface is down, bring it up */
1299
if(strcmp(interface, "none") != 0){
932
1300
if_index = (AvahiIfIndex) if_nametoindex(interface);
933
1301
if(if_index == 0){
934
1302
fprintf(stderr, "No such interface: \"%s\"\n", interface);
938
if(connect_to != NULL){
939
/* Connect directly, do not use Zeroconf */
940
/* (Mainly meant for debugging) */
941
char *address = strrchr(connect_to, ':');
943
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
948
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
955
address = connect_to;
956
ret = start_mandos_communication(address, port, if_index, &mc);
958
exitcode = EXIT_FAILURE;
960
exitcode = EXIT_SUCCESS;
966
avahi_set_log_function(empty_log);
969
/* Initialize the pseudo-RNG for Avahi */
970
srand((unsigned int) time(NULL));
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
977
exitcode = EXIT_FAILURE;
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
1002
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
1007
/* Create the Avahi service browser */
1008
sb = avahi_s_service_browser_new(mc.server, if_index,
1010
"_mandos._tcp", NULL, 0,
1011
browse_callback, &mc);
1013
fprintf(stderr, "Failed to create service browser: %s\n",
1014
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
1019
/* Run the main loop */
1022
fprintf(stderr, "Starting Avahi loop search\n");
1025
avahi_simple_poll_loop(mc.simple_poll);
1303
exitcode = EXIT_FAILURE;
1311
/* Re-raise priviliges */
1319
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1320
messages to mess up the prompt */
1321
ret = klogctl(8, NULL, 5);
1322
bool restore_loglevel = true;
1324
restore_loglevel = false;
1327
#endif /* __linux__ */
1329
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1332
exitcode = EXIT_FAILURE;
1334
if(restore_loglevel){
1335
ret = klogctl(7, NULL, 0);
1340
#endif /* __linux__ */
1341
/* Lower privileges */
1349
strcpy(network.ifr_name, interface);
1350
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1352
perror("ioctl SIOCGIFFLAGS");
1354
if(restore_loglevel){
1355
ret = klogctl(7, NULL, 0);
1360
#endif /* __linux__ */
1361
exitcode = EXIT_FAILURE;
1362
/* Lower privileges */
1370
if((network.ifr_flags & IFF_UP) == 0){
1371
network.ifr_flags |= IFF_UP;
1372
take_down_interface = true;
1373
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1375
take_down_interface = false;
1376
perror("ioctl SIOCSIFFLAGS");
1377
exitcode = EXIT_FAILURE;
1379
if(restore_loglevel){
1380
ret = klogctl(7, NULL, 0);
1385
#endif /* __linux__ */
1386
/* Lower privileges */
1395
/* sleep checking until interface is running */
1396
for(int i=0; i < delay * 4; i++){
1397
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1399
perror("ioctl SIOCGIFFLAGS");
1400
} else if(network.ifr_flags & IFF_RUNNING){
1403
struct timespec sleeptime = { .tv_nsec = 250000000 };
1404
ret = nanosleep(&sleeptime, NULL);
1405
if(ret == -1 and errno != EINTR){
1406
perror("nanosleep");
1409
if(not take_down_interface){
1410
/* We won't need the socket anymore */
1411
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1417
if(restore_loglevel){
1418
/* Restores kernel loglevel to default */
1419
ret = klogctl(7, NULL, 0);
1424
#endif /* __linux__ */
1425
/* Lower privileges */
1427
if(take_down_interface){
1428
/* Lower privileges */
1434
/* Lower privileges permanently */
1446
ret = init_gnutls_global(pubkey, seckey);
1448
fprintf(stderr, "init_gnutls_global failed\n");
1449
exitcode = EXIT_FAILURE;
1452
gnutls_initialized = true;
1459
tempdir_created = true;
1460
if(mkdtemp(tempdir) == NULL){
1461
tempdir_created = false;
1470
if(not init_gpgme(pubkey, seckey, tempdir)){
1471
fprintf(stderr, "init_gpgme failed\n");
1472
exitcode = EXIT_FAILURE;
1475
gpgme_initialized = true;
1482
if(connect_to != NULL){
1483
/* Connect directly, do not use Zeroconf */
1484
/* (Mainly meant for debugging) */
1485
char *address = strrchr(connect_to, ':');
1486
if(address == NULL){
1487
fprintf(stderr, "No colon in address\n");
1488
exitcode = EXIT_FAILURE;
1498
tmpmax = strtoimax(address+1, &tmp, 10);
1499
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1500
or tmpmax != (uint16_t)tmpmax){
1501
fprintf(stderr, "Bad port number\n");
1502
exitcode = EXIT_FAILURE;
1510
port = (uint16_t)tmpmax;
1512
address = connect_to;
1513
/* Colon in address indicates IPv6 */
1515
if(strchr(address, ':') != NULL){
1525
ret = start_mandos_communication(address, port, if_index, af);
1527
exitcode = EXIT_FAILURE;
1529
exitcode = EXIT_SUCCESS;
1539
AvahiServerConfig config;
1540
/* Do not publish any local Zeroconf records */
1541
avahi_server_config_init(&config);
1542
config.publish_hinfo = 0;
1543
config.publish_addresses = 0;
1544
config.publish_workstation = 0;
1545
config.publish_domain = 0;
1547
/* Allocate a new server */
1548
mc.server = avahi_server_new(avahi_simple_poll_get
1549
(mc.simple_poll), &config, NULL,
1552
/* Free the Avahi configuration data */
1553
avahi_server_config_free(&config);
1556
/* Check if creating the Avahi server object succeeded */
1557
if(mc.server == NULL){
1558
fprintf(stderr, "Failed to create Avahi server: %s\n",
1559
avahi_strerror(error));
1560
exitcode = EXIT_FAILURE;
1568
/* Create the Avahi service browser */
1569
sb = avahi_s_service_browser_new(mc.server, if_index,
1570
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1571
NULL, 0, browse_callback, NULL);
1573
fprintf(stderr, "Failed to create service browser: %s\n",
1574
avahi_strerror(avahi_server_errno(mc.server)));
1575
exitcode = EXIT_FAILURE;
1583
/* Run the main loop */
1586
fprintf(stderr, "Starting Avahi loop search\n");
1589
avahi_simple_poll_loop(mc.simple_poll);
1030
fprintf(stderr, "%s exiting\n", argv[0]);
1033
/* Cleanup things */
1035
avahi_s_service_browser_free(sb);
1037
if (mc.server != NULL)
1038
avahi_server_free(mc.server);
1040
if (mc.simple_poll != NULL)
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();
1594
fprintf(stderr, "%s exiting\n", argv[0]);
1597
/* Cleanup things */
1599
avahi_s_service_browser_free(sb);
1601
if(mc.server != NULL)
1602
avahi_server_free(mc.server);
1604
if(mc.simple_poll != NULL)
1605
avahi_simple_poll_free(mc.simple_poll);
1607
if(gnutls_initialized){
1608
gnutls_certificate_free_credentials(mc.cred);
1609
gnutls_global_deinit();
1610
gnutls_dh_params_deinit(mc.dh_params);
1613
if(gpgme_initialized){
1614
gpgme_release(mc.ctx);
1617
/* Take down the network interface */
1618
if(take_down_interface){
1619
/* Re-raise priviliges */
1626
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1628
perror("ioctl SIOCGIFFLAGS");
1629
} else if(network.ifr_flags & IFF_UP) {
1630
network.ifr_flags &= ~IFF_UP; /* clear flag */
1631
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1633
perror("ioctl SIOCSIFFLAGS");
1636
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1640
/* Lower privileges permanently */
1649
/* Removes the temp directory used by GPGME */
1650
if(tempdir_created){
1652
struct dirent *direntry;
1653
d = opendir(tempdir);
1655
if(errno != ENOENT){
1660
direntry = readdir(d);
1661
if(direntry == NULL){
1664
/* Skip "." and ".." */
1665
if(direntry->d_name[0] == '.'
1666
and (direntry->d_name[1] == '\0'
1667
or (direntry->d_name[1] == '.'
1668
and direntry->d_name[2] == '\0'))){
1671
char *fullname = NULL;
1672
ret = asprintf(&fullname, "%s/%s", tempdir,
1678
ret = remove(fullname);
1680
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1687
ret = rmdir(tempdir);
1688
if(ret == -1 and errno != ENOENT){
1694
sigemptyset(&old_sigterm_action.sa_mask);
1695
old_sigterm_action.sa_handler = SIG_DFL;
1696
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
1697
&old_sigterm_action,
1700
perror("sigaction");
1703
ret = raise(signal_received);
1704
} while(ret != 0 and errno == EINTR);
1709
TEMP_FAILURE_RETRY(pause());