152
166
const char *priority;
154
168
server *current_server;
170
size_t interfaces_size;
155
171
} mandos_context;
157
/* global context so signal handler can reach it*/
158
mandos_context mc = { .simple_poll = NULL, .server = NULL,
159
.dh_bits = 1024, .priority = "SECURE256"
160
":!CTYPE-X.509:+CTYPE-OPENPGP",
161
.current_server = NULL };
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
163
176
sig_atomic_t quit_now = 0;
164
177
int signal_received = 0;
166
179
/* Function to use when printing errors */
167
180
void perror_plus(const char *print_text){
168
182
fprintf(stderr, "Mandos plugin %s: ",
169
183
program_invocation_short_name);
170
185
perror(print_text);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
174
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
175
200
* bytes. "buffer_capacity" is how much is currently allocated,
176
201
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
178
204
size_t incbuffer(char **buffer, size_t buffer_length,
179
size_t buffer_capacity){
205
size_t buffer_capacity){
180
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
181
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
185
216
buffer_capacity += BUFFER_SIZE;
187
218
return buffer_capacity;
190
int add_server(const char *ip, uint16_t port,
191
AvahiIfIndex if_index,
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
194
226
server *new_server = malloc(sizeof(server));
195
227
if(new_server == NULL){
196
228
perror_plus("malloc");
199
231
*new_server = (server){ .ip = strdup(ip),
201
.if_index = if_index,
233
.if_index = if_index,
203
235
if(new_server->ip == NULL){
204
236
perror_plus("strdup");
207
/* unique case of first server */
208
if (mc.current_server == NULL){
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
209
256
new_server->next = new_server;
210
257
new_server->prev = new_server;
211
mc.current_server = new_server;
212
/* Placing the new server last in the list */
258
*current_server = new_server;
214
new_server->next = mc.current_server;
215
new_server->prev = mc.current_server->prev;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
216
263
new_server->prev->next = new_server;
217
mc.current_server->prev = new_server;
219
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
221
perror_plus("clock_gettime");
264
(*current_server)->prev = new_server;
228
270
* Initialize GPGME.
230
static bool init_gpgme(const char *seckey,
231
const char *pubkey, const char *tempdir){
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
232
277
gpgme_error_t rc;
233
278
gpgme_engine_info_t engine_info;
237
281
* Helper function to insert pub and seckey to the engine keyring.
239
bool import_key(const char *filename){
283
bool import_key(const char * const filename){
242
286
gpgme_data_t pgp_data;
331
379
ssize_t plaintext_length = 0;
334
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
337
385
/* Create new GPGME data buffer from memory cryptotext */
338
386
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
340
388
if(rc != GPG_ERR_NO_ERROR){
341
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
342
gpgme_strsource(rc), gpgme_strerror(rc));
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
346
394
/* Create new empty GPGME data buffer for the plaintext */
347
395
rc = gpgme_data_new(&dh_plain);
348
396
if(rc != GPG_ERR_NO_ERROR){
349
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
350
gpgme_strsource(rc), gpgme_strerror(rc));
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
351
400
gpgme_data_release(dh_crypto);
355
404
/* Decrypt data from the cryptotext data buffer to the plaintext
357
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
358
407
if(rc != GPG_ERR_NO_ERROR){
359
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
360
gpgme_strsource(rc), gpgme_strerror(rc));
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
361
410
plaintext_length = -1;
363
412
gpgme_decrypt_result_t result;
364
result = gpgme_op_decrypt_result(mc.ctx);
413
result = gpgme_op_decrypt_result(mc->ctx);
365
414
if(result == NULL){
366
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
368
fprintf(stderr, "Unsupported algorithm: %s\n",
369
result->unsupported_algorithm);
370
fprintf(stderr, "Wrong key usage: %u\n",
371
result->wrong_key_usage);
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
372
421
if(result->file_name != NULL){
373
fprintf(stderr, "File name: %s\n", result->file_name);
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
375
424
gpgme_recipient_t recipient;
376
425
recipient = result->recipients;
377
426
while(recipient != NULL){
378
fprintf(stderr, "Public key algorithm: %s\n",
379
gpgme_pubkey_algo_name(recipient->pubkey_algo));
380
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
381
fprintf(stderr, "Secret key available: %s\n",
382
recipient->status == GPG_ERR_NO_SECKEY
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
384
434
recipient = recipient->next;
483
536
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
537
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
538
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
539
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
540
safer_gnutls_strerror(ret));
488
541
gnutls_global_deinit();
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
546
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
547
" secret key %s as GnuTLS credentials\n",
498
552
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
553
(mc->cred, pubkeyfilename, seckeyfilename,
500
554
GNUTLS_OPENPGP_FMT_BASE64);
501
555
if(ret != GNUTLS_E_SUCCESS){
503
"Error[%d] while reading the OpenPGP key pair ('%s',"
504
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
505
fprintf(stderr, "The GnuTLS error is: %s\n",
506
safer_gnutls_strerror(ret));
557
"Error[%d] while reading the OpenPGP key pair ('%s',"
558
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
559
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
560
safer_gnutls_strerror(ret));
510
564
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
565
ret = gnutls_dh_params_init(&mc->dh_params);
512
566
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
567
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
568
" initialization: %s\n",
569
safer_gnutls_strerror(ret));
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
572
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
573
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
574
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
575
safer_gnutls_strerror(ret));
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
579
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
585
gnutls_certificate_free_credentials(mc->cred);
531
586
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
587
gnutls_dh_params_deinit(mc->dh_params);
536
static int init_gnutls_session(gnutls_session_t *session){
591
__attribute__((nonnull, warn_unused_result))
592
static int init_gnutls_session(gnutls_session_t *session,
538
595
/* GnuTLS session creation */
592
650
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
593
651
__attribute__((unused)) const char *txt){}
653
/* Set effective uid to 0, return errno */
654
__attribute__((warn_unused_result))
655
error_t raise_privileges(void){
656
error_t old_errno = errno;
657
error_t ret_errno = 0;
658
if(seteuid(0) == -1){
665
/* Set effective and real user ID to 0. Return errno. */
666
__attribute__((warn_unused_result))
667
error_t raise_privileges_permanently(void){
668
error_t old_errno = errno;
669
error_t ret_errno = raise_privileges();
681
/* Set effective user ID to unprivileged saved user ID */
682
__attribute__((warn_unused_result))
683
error_t lower_privileges(void){
684
error_t old_errno = errno;
685
error_t ret_errno = 0;
686
if(seteuid(uid) == -1){
693
/* Lower privileges permanently */
694
__attribute__((warn_unused_result))
695
error_t lower_privileges_permanently(void){
696
error_t old_errno = errno;
697
error_t ret_errno = 0;
698
if(setuid(uid) == -1){
705
/* Helper function to add_local_route() and delete_local_route() */
706
__attribute__((nonnull, warn_unused_result))
707
static bool add_delete_local_route(const bool add,
709
AvahiIfIndex if_index){
711
char helper[] = "mandos-client-iprouteadddel";
712
char add_arg[] = "add";
713
char delete_arg[] = "delete";
714
char debug_flag[] = "--debug";
715
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
716
if(pluginhelperdir == NULL){
718
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
719
" variable not set; cannot run helper\n");
724
char interface[IF_NAMESIZE];
725
if(if_indextoname((unsigned int)if_index, interface) == NULL){
726
perror_plus("if_indextoname");
730
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
732
perror_plus("open(\"/dev/null\", O_RDONLY)");
738
/* Raise privileges */
739
errno = raise_privileges_permanently();
741
perror_plus("Failed to raise privileges");
742
/* _exit(EX_NOPERM); */
748
perror_plus("setgid");
751
/* Reset supplementary groups */
753
ret = setgroups(0, NULL);
755
perror_plus("setgroups");
759
ret = dup2(devnull, STDIN_FILENO);
761
perror_plus("dup2(devnull, STDIN_FILENO)");
764
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
766
perror_plus("close");
769
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
771
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
774
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
779
if(helperdir_fd == -1){
781
_exit(EX_UNAVAILABLE);
783
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
786
perror_plus("openat");
787
_exit(EX_UNAVAILABLE);
789
TEMP_FAILURE_RETRY(close(helperdir_fd));
791
#pragma GCC diagnostic push
792
#pragma GCC diagnostic ignored "-Wcast-qual"
794
if(fexecve(helper_fd, (char *const [])
795
{ helper, add ? add_arg : delete_arg, (char *)address,
796
interface, debug ? debug_flag : NULL, NULL },
799
#pragma GCC diagnostic pop
801
perror_plus("fexecve");
813
pret = waitpid(pid, &status, 0);
814
if(pret == -1 and errno == EINTR and quit_now){
815
int errno_raising = 0;
816
if((errno = raise_privileges()) != 0){
817
errno_raising = errno;
818
perror_plus("Failed to raise privileges in order to"
819
" kill helper program");
821
if(kill(pid, SIGTERM) == -1){
824
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
825
perror_plus("Failed to lower privileges after killing"
830
} while(pret == -1 and errno == EINTR);
832
perror_plus("waitpid");
835
if(WIFEXITED(status)){
836
if(WEXITSTATUS(status) != 0){
837
fprintf_plus(stderr, "Error: iprouteadddel exited"
838
" with status %d\n", WEXITSTATUS(status));
843
if(WIFSIGNALED(status)){
844
fprintf_plus(stderr, "Error: iprouteadddel died by"
845
" signal %d\n", WTERMSIG(status));
848
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
852
__attribute__((nonnull, warn_unused_result))
853
static bool add_local_route(const char *address,
854
AvahiIfIndex if_index){
856
fprintf_plus(stderr, "Adding route to %s\n", address);
858
return add_delete_local_route(true, address, if_index);
861
__attribute__((nonnull, warn_unused_result))
862
static bool delete_local_route(const char *address,
863
AvahiIfIndex if_index){
865
fprintf_plus(stderr, "Removing route to %s\n", address);
867
return add_delete_local_route(false, address, if_index);
595
870
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
871
__attribute__((nonnull, warn_unused_result))
872
static int start_mandos_communication(const char *ip, in_port_t port,
597
873
AvahiIfIndex if_index,
874
int af, mandos_context *mc){
599
875
int ret, tcp_sd = -1;
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
877
struct sockaddr_storage to;
605
878
char *buffer = NULL;
606
879
char *decrypted_buffer = NULL;
607
880
size_t buffer_length = 0;
708
1008
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
1009
perror_plus("if_indextoname");
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1011
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1012
"\n", ip, interface, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1015
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1016
ip, (uintmax_t)port);
718
1018
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
1019
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
722
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
725
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
729
perror_plus("inet_ntop");
731
if(strcmp(addrstr, ip) != 0){
732
fprintf(stderr, "Canonical address form: %s\n", addrstr);
743
ret = connect(tcp_sd, &to.in6, sizeof(to));
745
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
748
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
750
perror_plus("connect");
1021
ret = getnameinfo((struct sockaddr *)&to,
1022
sizeof(struct sockaddr_in6),
1023
addrstr, sizeof(addrstr), NULL, 0,
1026
ret = getnameinfo((struct sockaddr *)&to,
1027
sizeof(struct sockaddr_in),
1028
addrstr, sizeof(addrstr), NULL, 0,
1031
if(ret == EAI_SYSTEM){
1032
perror_plus("getnameinfo");
1033
} else if(ret != 0) {
1034
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1035
} else if(strcmp(addrstr, ip) != 0){
1036
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1047
ret = connect(tcp_sd, (struct sockaddr *)&to,
1048
sizeof(struct sockaddr_in6));
1050
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1051
sizeof(struct sockaddr_in));
1054
if(errno == ENETUNREACH
1055
and if_index != AVAHI_IF_UNSPEC
1056
and connect_to == NULL
1057
and not route_added and
1058
((af == AF_INET6 and not
1059
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1061
or (af == AF_INET and
1062
/* Not a a IPv4LL address */
1063
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1064
& 0xFFFF0000L) != 0xA9FE0000L))){
1065
/* Work around Avahi bug - Avahi does not announce link-local
1066
addresses if it has a global address, so local hosts with
1067
*only* a link-local address (e.g. Mandos clients) cannot
1068
connect to a Mandos server announced by Avahi on a server
1069
host with a global address. Work around this by retrying
1070
with an explicit route added with the server's address.
1072
Avahi bug reference:
1073
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1074
https://bugs.debian.org/587961
1077
fprintf_plus(stderr, "Mandos server unreachable, trying"
1081
route_added = add_local_route(ip, if_index);
1087
if(errno != ECONNREFUSED or debug){
1089
perror_plus("connect");
761
1102
const char *out = mandos_protocol_version;
999
1355
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1356
avahi_address_snprint(ip, sizeof(ip), address);
1002
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
1003
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
1004
ip, (intmax_t)interface, port);
1358
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1359
PRIdMAX ") on port %" PRIu16 "\n", name,
1360
host_name, ip, (intmax_t)interface, port);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1362
int ret = start_mandos_communication(ip, (in_port_t)port,
1364
avahi_proto_to_af(proto),
1009
avahi_simple_poll_quit(mc.simple_poll);
1367
avahi_simple_poll_quit(simple_poll);
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1369
if(not add_server(ip, (in_port_t)port, interface,
1370
avahi_proto_to_af(proto),
1371
&((mandos_context*)mc)->current_server)){
1372
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
1447
signal_received = sig;
1079
1448
int old_errno = errno;
1080
1449
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1450
if(simple_poll != NULL){
1451
avahi_simple_poll_quit(simple_poll);
1084
1453
errno = old_errno;
1456
__attribute__((nonnull, warn_unused_result))
1457
bool get_flags(const char *ifname, struct ifreq *ifr){
1461
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1464
perror_plus("socket");
1468
strcpy(ifr->ifr_name, ifname);
1469
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1473
perror_plus("ioctl SIOCGIFFLAGS");
1481
__attribute__((nonnull, warn_unused_result))
1482
bool good_flags(const char *ifname, const struct ifreq *ifr){
1484
/* Reject the loopback device */
1485
if(ifr->ifr_flags & IFF_LOOPBACK){
1487
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1492
/* Accept point-to-point devices only if connect_to is specified */
1493
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1495
fprintf_plus(stderr, "Accepting point-to-point interface"
1496
" \"%s\"\n", ifname);
1500
/* Otherwise, reject non-broadcast-capable devices */
1501
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1503
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1504
" \"%s\"\n", ifname);
1508
/* Reject non-ARP interfaces (including dummy interfaces) */
1509
if(ifr->ifr_flags & IFF_NOARP){
1511
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1517
/* Accept this device */
1519
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1088
1525
* This function determines if a directory entry in /sys/class/net
1089
1526
* corresponds to an acceptable network device.
1090
1527
* (This function is passed to scandir(3) as a filter function.)
1529
__attribute__((nonnull, warn_unused_result))
1092
1530
int good_interface(const struct dirent *if_entry){
1094
char *flagname = NULL;
1095
1531
if(if_entry->d_name[0] == '.'){
1098
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1101
perror_plus("asprintf");
1104
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1106
perror_plus("open");
1111
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1112
/* read line from flags_fd */
1113
ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */
1114
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1115
flagstring[(size_t)to_read] = '\0';
1116
if(flagstring == NULL){
1117
perror_plus("malloc");
1122
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1125
perror_plus("read");
1139
tmpmax = strtoimax(flagstring, &tmp, 0);
1140
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1141
and not (isspace(*tmp)))
1142
or tmpmax != (ifreq_flags)tmpmax){
1144
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1145
flagstring, if_entry->d_name);
1151
ifreq_flags flags = (ifreq_flags)tmpmax;
1152
/* Reject the loopback device */
1153
if(flags & IFF_LOOPBACK){
1155
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1160
/* Accept point-to-point devices only if connect_to is specified */
1161
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1163
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1168
/* Otherwise, reject non-broadcast-capable devices */
1169
if(not (flags & IFF_BROADCAST)){
1171
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1176
/* Reject non-ARP interfaces (including dummy interfaces) */
1177
if(flags & IFF_NOARP){
1179
fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",
1184
/* Accept this device */
1186
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1536
if(not get_flags(if_entry->d_name, &ifr)){
1538
fprintf_plus(stderr, "Failed to get flags for interface "
1539
"\"%s\"\n", if_entry->d_name);
1544
if(not good_flags(if_entry->d_name, &ifr)){
1551
* This function determines if a network interface is up.
1553
__attribute__((nonnull, warn_unused_result))
1554
bool interface_is_up(const char *interface){
1556
if(not get_flags(interface, &ifr)){
1558
fprintf_plus(stderr, "Failed to get flags for interface "
1559
"\"%s\"\n", interface);
1564
return (bool)(ifr.ifr_flags & IFF_UP);
1568
* This function determines if a network interface is running
1570
__attribute__((nonnull, warn_unused_result))
1571
bool interface_is_running(const char *interface){
1573
if(not get_flags(interface, &ifr)){
1575
fprintf_plus(stderr, "Failed to get flags for interface "
1576
"\"%s\"\n", interface);
1581
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1584
__attribute__((nonnull, pure, warn_unused_result))
1192
1585
int notdotentries(const struct dirent *direntry){
1193
1586
/* Skip "." and ".." */
1194
1587
if(direntry->d_name[0] == '.'
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1596
/* Is this directory entry a runnable program? */
1597
__attribute__((nonnull, warn_unused_result))
1598
int runnable_hook(const struct dirent *direntry){
1603
if((direntry->d_name)[0] == '\0'){
1608
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1609
"abcdefghijklmnopqrstuvwxyz"
1612
if((direntry->d_name)[sret] != '\0'){
1613
/* Contains non-allowed characters */
1615
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1621
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1624
perror_plus("Could not stat hook");
1628
if(not (S_ISREG(st.st_mode))){
1629
/* Not a regular file */
1631
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1636
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1637
/* Not executable */
1639
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1645
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1651
__attribute__((nonnull, warn_unused_result))
1652
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1653
mandos_context *mc){
1205
1655
struct timespec now;
1206
1656
struct timespec waited_time;
1207
1657
intmax_t block_time;
1210
if(mc.current_server == NULL){
1213
"Wait until first server is found. No timeout!\n");
1660
if(mc->current_server == NULL){
1662
fprintf_plus(stderr, "Wait until first server is found."
1215
1665
ret = avahi_simple_poll_iterate(s, -1);
1218
fprintf(stderr, "Check current_server if we should run it,"
1668
fprintf_plus(stderr, "Check current_server if we should run"
1221
1671
/* the current time */
1222
1672
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1677
/* Calculating in ms how long time between now and server
1228
1678
who we visted longest time ago. Now - last seen. */
1229
1679
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1680
- mc->current_server->last_seen.tv_sec);
1231
1681
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1682
- mc->current_server->last_seen.tv_nsec);
1233
1683
/* total time is 10s/10,000ms.
1234
1684
Converting to s from ms by dividing by 1,000,
1235
1685
and ns to ms by dividing by 1,000,000. */
1236
1686
block_time = ((retry_interval
1237
1687
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1688
- ((intmax_t)waited_time.tv_nsec / 1000000));
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1691
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1244
1695
if(block_time <= 0){
1245
ret = start_mandos_communication(mc.current_server->ip,
1246
mc.current_server->port,
1247
mc.current_server->if_index,
1248
mc.current_server->af);
1696
ret = start_mandos_communication(mc->current_server->ip,
1697
mc->current_server->port,
1698
mc->current_server->if_index,
1699
mc->current_server->af, mc);
1250
avahi_simple_poll_quit(mc.simple_poll);
1701
avahi_simple_poll_quit(s);
1253
1704
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1705
&mc->current_server->last_seen);
1256
1707
perror_plus("clock_gettime");
1259
mc.current_server = mc.current_server->next;
1710
mc->current_server = mc->current_server->next;
1260
1711
block_time = 0; /* Call avahi to find new Mandos
1261
1712
servers, but don't block */
1264
1715
ret = avahi_simple_poll_iterate(s, (int)block_time);
1267
if (ret > 0 or errno != EINTR) {
1718
if(ret > 0 or errno != EINTR){
1268
1719
return (ret != 1) ? ret : 0;
1725
__attribute__((nonnull))
1726
void run_network_hooks(const char *mode, const char *interface,
1728
struct dirent **direntries = NULL;
1729
if(hookdir_fd == -1){
1730
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1732
if(hookdir_fd == -1){
1733
if(errno == ENOENT){
1735
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1736
" found\n", hookdir);
1739
perror_plus("open");
1745
#if __GLIBC_PREREQ(2, 15)
1746
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1747
runnable_hook, alphasort);
1748
#else /* not __GLIBC_PREREQ(2, 15) */
1749
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1751
#endif /* not __GLIBC_PREREQ(2, 15) */
1752
#else /* not __GLIBC__ */
1753
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1755
#endif /* not __GLIBC__ */
1757
perror_plus("scandir");
1760
struct dirent *direntry;
1762
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1764
perror_plus("open(\"/dev/null\", O_RDONLY)");
1767
for(int i = 0; i < numhooks; i++){
1768
direntry = direntries[i];
1770
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1773
pid_t hook_pid = fork();
1776
/* Raise privileges */
1777
errno = raise_privileges_permanently();
1779
perror_plus("Failed to raise privileges");
1786
perror_plus("setgid");
1789
/* Reset supplementary groups */
1791
ret = setgroups(0, NULL);
1793
perror_plus("setgroups");
1796
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1798
perror_plus("setenv");
1801
ret = setenv("DEVICE", interface, 1);
1803
perror_plus("setenv");
1806
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1808
perror_plus("setenv");
1811
ret = setenv("MODE", mode, 1);
1813
perror_plus("setenv");
1817
ret = asprintf(&delaystring, "%f", (double)delay);
1819
perror_plus("asprintf");
1822
ret = setenv("DELAY", delaystring, 1);
1825
perror_plus("setenv");
1829
if(connect_to != NULL){
1830
ret = setenv("CONNECT", connect_to, 1);
1832
perror_plus("setenv");
1836
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1840
perror_plus("openat");
1841
_exit(EXIT_FAILURE);
1843
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1844
perror_plus("close");
1845
_exit(EXIT_FAILURE);
1847
ret = dup2(devnull, STDIN_FILENO);
1849
perror_plus("dup2(devnull, STDIN_FILENO)");
1852
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1854
perror_plus("close");
1857
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1859
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1862
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1864
perror_plus("fexecve");
1865
_exit(EXIT_FAILURE);
1869
perror_plus("fork");
1874
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1875
perror_plus("waitpid");
1879
if(WIFEXITED(status)){
1880
if(WEXITSTATUS(status) != 0){
1881
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1882
" with status %d\n", direntry->d_name,
1883
WEXITSTATUS(status));
1887
} else if(WIFSIGNALED(status)){
1888
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1889
" signal %d\n", direntry->d_name,
1894
fprintf_plus(stderr, "Warning: network hook \"%s\""
1895
" crashed\n", direntry->d_name);
1901
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1907
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1908
perror_plus("close");
1915
__attribute__((nonnull, warn_unused_result))
1916
error_t bring_up_interface(const char *const interface,
1918
error_t old_errno = errno;
1920
struct ifreq network;
1921
unsigned int if_index = if_nametoindex(interface);
1923
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1933
if(not interface_is_up(interface)){
1934
error_t ret_errno = 0, ioctl_errno = 0;
1935
if(not get_flags(interface, &network)){
1937
fprintf_plus(stderr, "Failed to get flags for interface "
1938
"\"%s\"\n", interface);
1942
network.ifr_flags |= IFF_UP; /* set flag */
1944
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1947
perror_plus("socket");
1953
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1955
perror_plus("close");
1962
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1966
/* Raise privileges */
1967
ret_errno = raise_privileges();
1970
perror_plus("Failed to raise privileges");
1975
bool restore_loglevel = false;
1977
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1978
messages about the network interface to mess up the prompt */
1979
ret_linux = klogctl(8, NULL, 5);
1980
if(ret_linux == -1){
1981
perror_plus("klogctl");
1983
restore_loglevel = true;
1986
#endif /* __linux__ */
1987
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1988
ioctl_errno = errno;
1990
if(restore_loglevel){
1991
ret_linux = klogctl(7, NULL, 0);
1992
if(ret_linux == -1){
1993
perror_plus("klogctl");
1996
#endif /* __linux__ */
1998
/* If raise_privileges() succeeded above */
2000
/* Lower privileges */
2001
ret_errno = lower_privileges();
2004
perror_plus("Failed to lower privileges");
2008
/* Close the socket */
2009
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2011
perror_plus("close");
2014
if(ret_setflags == -1){
2015
errno = ioctl_errno;
2016
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2021
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2025
/* Sleep checking until interface is running.
2026
Check every 0.25s, up to total time of delay */
2027
for(int i=0; i < delay * 4; i++){
2028
if(interface_is_running(interface)){
2031
struct timespec sleeptime = { .tv_nsec = 250000000 };
2032
ret = nanosleep(&sleeptime, NULL);
2033
if(ret == -1 and errno != EINTR){
2034
perror_plus("nanosleep");
2042
__attribute__((nonnull, warn_unused_result))
2043
error_t take_down_interface(const char *const interface){
2044
error_t old_errno = errno;
2045
struct ifreq network;
2046
unsigned int if_index = if_nametoindex(interface);
2048
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2052
if(interface_is_up(interface)){
2053
error_t ret_errno = 0, ioctl_errno = 0;
2054
if(not get_flags(interface, &network) and debug){
2056
fprintf_plus(stderr, "Failed to get flags for interface "
2057
"\"%s\"\n", interface);
2061
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2063
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2066
perror_plus("socket");
2072
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2076
/* Raise privileges */
2077
ret_errno = raise_privileges();
2080
perror_plus("Failed to raise privileges");
2083
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2084
ioctl_errno = errno;
2086
/* If raise_privileges() succeeded above */
2088
/* Lower privileges */
2089
ret_errno = lower_privileges();
2092
perror_plus("Failed to lower privileges");
2096
/* Close the socket */
2097
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2099
perror_plus("close");
2102
if(ret_setflags == -1){
2103
errno = ioctl_errno;
2104
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2109
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1274
2117
int main(int argc, char *argv[]){
2118
mandos_context mc = { .server = NULL, .dh_bits = 1024,
2119
.priority = "SECURE256:!CTYPE-X.509:"
2120
"+CTYPE-OPENPGP", .current_server = NULL,
2121
.interfaces = NULL, .interfaces_size = 0 };
1275
2122
AvahiSServiceBrowser *sb = NULL;
1278
2125
intmax_t tmpmax;
1280
2127
int exitcode = EXIT_SUCCESS;
1281
const char *interface = "";
1282
struct ifreq network;
1284
bool take_down_interface = false;
1287
char tempdir[] = "/tmp/mandosXXXXXX";
1288
bool tempdir_created = false;
2128
char *interfaces_to_take_down = NULL;
2129
size_t interfaces_to_take_down_size = 0;
2130
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2131
char old_tempdir[] = "/tmp/mandosXXXXXX";
2132
char *tempdir = NULL;
1289
2133
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
2134
const char *seckey = PATHDIR "/" SECKEY;
1291
2135
const char *pubkey = PATHDIR "/" PUBKEY;
2136
char *interfaces_hooks = NULL;
1293
2138
bool gnutls_initialized = false;
1294
2139
bool gpgme_initialized = false;
1460
2317
/* Work around Debian bug #633582:
1461
2318
<http://bugs.debian.org/633582> */
1464
/* Re-raise priviliges */
1468
perror_plus("seteuid");
1471
int seckey_fd = open(PATHDIR "/" SECKEY, O_RDONLY);
1472
if(seckey_fd == -1){
1473
perror_plus("open");
1475
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1477
perror_plus("fstat");
1479
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1480
ret = fchown(seckey_fd, uid, gid);
1482
perror_plus("fchown");
1486
TEMP_FAILURE_RETRY(close(seckey_fd));
1489
int pubkey_fd = open(PATHDIR "/" PUBKEY, O_RDONLY);
1490
if(pubkey_fd == -1){
1491
perror_plus("open");
1493
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1495
perror_plus("fstat");
1497
if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){
1498
ret = fchown(pubkey_fd, uid, gid);
1500
perror_plus("fchown");
1504
TEMP_FAILURE_RETRY(close(pubkey_fd));
1507
/* Lower privileges */
1511
perror_plus("seteuid");
2320
/* Re-raise privileges */
2321
ret_errno = raise_privileges();
2324
perror_plus("Failed to raise privileges");
2328
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2329
int seckey_fd = open(seckey, O_RDONLY);
2330
if(seckey_fd == -1){
2331
perror_plus("open");
2333
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2335
perror_plus("fstat");
2337
if(S_ISREG(st.st_mode)
2338
and st.st_uid == 0 and st.st_gid == 0){
2339
ret = fchown(seckey_fd, uid, gid);
2341
perror_plus("fchown");
2345
TEMP_FAILURE_RETRY(close(seckey_fd));
2349
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2350
int pubkey_fd = open(pubkey, O_RDONLY);
2351
if(pubkey_fd == -1){
2352
perror_plus("open");
2354
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2356
perror_plus("fstat");
2358
if(S_ISREG(st.st_mode)
2359
and st.st_uid == 0 and st.st_gid == 0){
2360
ret = fchown(pubkey_fd, uid, gid);
2362
perror_plus("fchown");
2366
TEMP_FAILURE_RETRY(close(pubkey_fd));
2370
/* Lower privileges */
2371
ret_errno = lower_privileges();
2374
perror_plus("Failed to lower privileges");
2379
/* Remove invalid interface names (except "none") */
2381
char *interface = NULL;
2382
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2384
if(strcmp(interface, "none") != 0
2385
and if_nametoindex(interface) == 0){
2386
if(interface[0] != '\0'){
2387
fprintf_plus(stderr, "Not using nonexisting interface"
2388
" \"%s\"\n", interface);
2390
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2396
/* Run network hooks */
2398
if(mc.interfaces != NULL){
2399
interfaces_hooks = malloc(mc.interfaces_size);
2400
if(interfaces_hooks == NULL){
2401
perror_plus("malloc");
2404
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2405
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2407
run_network_hooks("start", interfaces_hooks != NULL ?
2408
interfaces_hooks : "", delay);
1516
2412
avahi_set_log_function(empty_log);
1519
if(interface[0] == '\0'){
1520
struct dirent **direntries;
1521
ret = scandir(sys_class_net, &direntries, good_interface,
1524
/* Pick the first good interface */
1525
interface = strdup(direntries[0]->d_name);
1527
fprintf(stderr, "Using interface \"%s\"\n", interface);
1529
if(interface == NULL){
1530
perror_plus("malloc");
1532
exitcode = EXIT_FAILURE;
1538
fprintf(stderr, "Could not find a network interface\n");
1539
exitcode = EXIT_FAILURE;
1544
2415
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1545
2416
from the signal handler */
1546
2417
/* Initialize the pseudo-RNG for Avahi */
1547
2418
srand((unsigned int) time(NULL));
1548
mc.simple_poll = avahi_simple_poll_new();
1549
if(mc.simple_poll == NULL){
1550
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2419
simple_poll = avahi_simple_poll_new();
2420
if(simple_poll == NULL){
2421
fprintf_plus(stderr,
2422
"Avahi: Failed to create simple poll object.\n");
1551
2423
exitcode = EX_UNAVAILABLE;
1618
/* If the interface is down, bring it up */
1619
if(strcmp(interface, "none") != 0){
1620
if_index = (AvahiIfIndex) if_nametoindex(interface);
1622
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1623
exitcode = EX_UNAVAILABLE;
1631
/* Re-raise priviliges */
1635
perror_plus("seteuid");
1639
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1640
messages about the network interface to mess up the prompt */
1641
ret = klogctl(8, NULL, 5);
1642
bool restore_loglevel = true;
1644
restore_loglevel = false;
1645
perror_plus("klogctl");
1647
#endif /* __linux__ */
1649
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1651
perror_plus("socket");
1652
exitcode = EX_OSERR;
1654
if(restore_loglevel){
1655
ret = klogctl(7, NULL, 0);
1657
perror_plus("klogctl");
1660
#endif /* __linux__ */
1661
/* Lower privileges */
1665
perror_plus("seteuid");
1669
strcpy(network.ifr_name, interface);
1670
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1672
perror_plus("ioctl SIOCGIFFLAGS");
1674
if(restore_loglevel){
1675
ret = klogctl(7, NULL, 0);
1677
perror_plus("klogctl");
1680
#endif /* __linux__ */
1681
exitcode = EX_OSERR;
1682
/* Lower privileges */
1686
perror_plus("seteuid");
1690
if((network.ifr_flags & IFF_UP) == 0){
1691
network.ifr_flags |= IFF_UP;
1692
take_down_interface = true;
1693
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1695
take_down_interface = false;
1696
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1697
exitcode = EX_OSERR;
1699
if(restore_loglevel){
1700
ret = klogctl(7, NULL, 0);
1702
perror_plus("klogctl");
2490
/* If no interfaces were specified, make a list */
2491
if(mc.interfaces == NULL){
2492
struct dirent **direntries = NULL;
2493
/* Look for any good interfaces */
2494
ret = scandir(sys_class_net, &direntries, good_interface,
2497
/* Add all found interfaces to interfaces list */
2498
for(int i = 0; i < ret; ++i){
2499
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2500
direntries[i]->d_name);
2503
perror_plus("argz_add");
2504
free(direntries[i]);
2508
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2509
direntries[i]->d_name);
2511
free(direntries[i]);
2518
fprintf_plus(stderr, "Could not find a network interface\n");
2519
exitcode = EXIT_FAILURE;
2524
/* Bring up interfaces which are down, and remove any "none"s */
2526
char *interface = NULL;
2527
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2529
/* If interface name is "none", stop bringing up interfaces.
2530
Also remove all instances of "none" from the list */
2531
if(strcmp(interface, "none") == 0){
2532
argz_delete(&mc.interfaces, &mc.interfaces_size,
2535
while((interface = argz_next(mc.interfaces,
2536
mc.interfaces_size, interface))){
2537
if(strcmp(interface, "none") == 0){
2538
argz_delete(&mc.interfaces, &mc.interfaces_size,
1705
#endif /* __linux__ */
1706
/* Lower privileges */
1710
perror_plus("seteuid");
1715
/* Sleep checking until interface is running.
1716
Check every 0.25s, up to total time of delay */
1717
for(int i=0; i < delay * 4; i++){
1718
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1720
perror_plus("ioctl SIOCGIFFLAGS");
1721
} else if(network.ifr_flags & IFF_RUNNING){
1724
struct timespec sleeptime = { .tv_nsec = 250000000 };
1725
ret = nanosleep(&sleeptime, NULL);
1726
if(ret == -1 and errno != EINTR){
1727
perror_plus("nanosleep");
1730
if(not take_down_interface){
1731
/* We won't need the socket anymore */
1732
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1734
perror_plus("close");
1738
if(restore_loglevel){
1739
/* Restores kernel loglevel to default */
1740
ret = klogctl(7, NULL, 0);
1742
perror_plus("klogctl");
1745
#endif /* __linux__ */
1746
/* Lower privileges */
1748
if(take_down_interface){
1749
/* Lower privileges */
1752
perror_plus("seteuid");
1755
/* Lower privileges permanently */
1758
perror_plus("setuid");
2545
bool interface_was_up = interface_is_up(interface);
2546
errno = bring_up_interface(interface, delay);
2547
if(not interface_was_up){
2549
perror_plus("Failed to bring up interface");
2551
errno = argz_add(&interfaces_to_take_down,
2552
&interfaces_to_take_down_size,
2555
perror_plus("argz_add");
2560
if(debug and (interfaces_to_take_down == NULL)){
2561
fprintf_plus(stderr, "No interfaces were brought up\n");
2565
/* If we only got one interface, explicitly use only that one */
2566
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2568
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2571
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1767
ret = init_gnutls_global(pubkey, seckey);
2578
ret = init_gnutls_global(pubkey, seckey, &mc);
1769
fprintf(stderr, "init_gnutls_global failed\n");
2580
fprintf_plus(stderr, "init_gnutls_global failed\n");
1770
2581
exitcode = EX_UNAVAILABLE;
1944
2777
if(gpgme_initialized){
1945
2778
gpgme_release(mc.ctx);
1948
2781
/* Cleans up the circular linked list of Mandos servers the client
1950
2783
if(mc.current_server != NULL){
1951
2784
mc.current_server->prev->next = NULL;
1952
2785
while(mc.current_server != NULL){
1953
2786
server *next = mc.current_server->next;
2788
#pragma GCC diagnostic push
2789
#pragma GCC diagnostic ignored "-Wcast-qual"
2791
free((char *)(mc.current_server->ip));
2793
#pragma GCC diagnostic pop
1954
2795
free(mc.current_server);
1955
2796
mc.current_server = next;
1959
/* Take down the network interface */
1960
if(take_down_interface){
1961
/* Re-raise priviliges */
1965
perror_plus("seteuid");
2800
/* Re-raise privileges */
2802
ret_errno = raise_privileges();
2805
perror_plus("Failed to raise privileges");
2808
/* Run network hooks */
2809
run_network_hooks("stop", interfaces_hooks != NULL ?
2810
interfaces_hooks : "", delay);
2812
/* Take down the network interfaces which were brought up */
2814
char *interface = NULL;
2815
while((interface=argz_next(interfaces_to_take_down,
2816
interfaces_to_take_down_size,
2818
ret_errno = take_down_interface(interface);
2821
perror_plus("Failed to take down interface");
2824
if(debug and (interfaces_to_take_down == NULL)){
2825
fprintf_plus(stderr, "No interfaces needed to be taken"
1968
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1970
perror_plus("ioctl SIOCGIFFLAGS");
1971
} else if(network.ifr_flags & IFF_UP) {
1972
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1973
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1975
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1978
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1980
perror_plus("close");
1982
/* Lower privileges permanently */
1986
perror_plus("setuid");
2831
ret_errno = lower_privileges_permanently();
2834
perror_plus("Failed to lower privileges permanently");
2838
free(interfaces_to_take_down);
2839
free(interfaces_hooks);
1991
2841
/* Removes the GPGME temp directory and all files inside */
1992
if(tempdir_created){
2842
if(tempdir != NULL){
1993
2843
struct dirent **direntries = NULL;
1994
struct dirent *direntry = NULL;
1995
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1997
for(int i = 0; i < ret; i++){
1998
direntry = direntries[i];
1999
char *fullname = NULL;
2000
ret = asprintf(&fullname, "%s/%s", tempdir,
2003
perror_plus("asprintf");
2006
ret = remove(fullname);
2008
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2844
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2848
if(tempdir_fd == -1){
2849
perror_plus("open");
2852
#if __GLIBC_PREREQ(2, 15)
2853
int numentries = scandirat(tempdir_fd, ".", &direntries,
2854
notdotentries, alphasort);
2855
#else /* not __GLIBC_PREREQ(2, 15) */
2856
int numentries = scandir(tempdir, &direntries, notdotentries,
2858
#endif /* not __GLIBC_PREREQ(2, 15) */
2859
#else /* not __GLIBC__ */
2860
int numentries = scandir(tempdir, &direntries, notdotentries,
2862
#endif /* not __GLIBC__ */
2863
if(numentries >= 0){
2864
for(int i = 0; i < numentries; i++){
2865
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2867
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2868
" \"%s\", 0): %s\n", tempdir,
2869
direntries[i]->d_name, strerror(errno));
2871
free(direntries[i]);
2874
/* need to clean even if 0 because man page doesn't specify */
2876
if(numentries == -1){
2877
perror_plus("scandir");
2879
ret = rmdir(tempdir);
2880
if(ret == -1 and errno != ENOENT){
2881
perror_plus("rmdir");
2015
/* need to be cleaned even if ret == 0 because man page doesn't
2019
perror_plus("scandir");
2021
ret = rmdir(tempdir);
2022
if(ret == -1 and errno != ENOENT){
2023
perror_plus("rmdir");
2884
TEMP_FAILURE_RETRY(close(tempdir_fd));