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
542
/* OpenPGP credentials */
484
ret = gnutls_certificate_allocate_credentials(&mc.cred);
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
485
544
if(ret != GNUTLS_E_SUCCESS){
486
fprintf(stderr, "GnuTLS memory error: %s\n",
487
safer_gnutls_strerror(ret));
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
488
547
gnutls_global_deinit();
493
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
494
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
498
558
ret = gnutls_certificate_set_openpgp_key_file
499
(mc.cred, pubkeyfilename, seckeyfilename,
559
(mc->cred, pubkeyfilename, seckeyfilename,
500
560
GNUTLS_OPENPGP_FMT_BASE64);
501
561
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));
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
510
570
/* GnuTLS server initialization */
511
ret = gnutls_dh_params_init(&mc.dh_params);
571
ret = gnutls_dh_params_init(&mc->dh_params);
512
572
if(ret != GNUTLS_E_SUCCESS){
513
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
514
" %s\n", safer_gnutls_strerror(ret));
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
517
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
586
buffer_capacity = incbuffer((char **)&buffer.data,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
601
/* check bytes_read for failure */
608
buffer.size += (unsigned int)bytes_read;
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
651
fprintf_plus(stderr, "Falling back to security parameter"
653
safe_string(gnutls_sec_param_get_name
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
679
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
518
680
if(ret != GNUTLS_E_SUCCESS){
519
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
520
safer_gnutls_strerror(ret));
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
524
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
686
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
530
gnutls_certificate_free_credentials(mc.cred);
692
gnutls_certificate_free_credentials(mc->cred);
531
693
gnutls_global_deinit();
532
gnutls_dh_params_deinit(mc.dh_params);
694
gnutls_dh_params_deinit(mc->dh_params);
536
static int init_gnutls_session(gnutls_session_t *session){
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
538
702
/* GnuTLS session creation */
592
757
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
593
758
__attribute__((unused)) const char *txt){}
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
816
AvahiIfIndex if_index){
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
855
perror_plus("setgid");
858
/* Reset supplementary groups */
860
ret = setgroups(0, NULL);
862
perror_plus("setgroups");
866
ret = dup2(devnull, STDIN_FILENO);
868
perror_plus("dup2(devnull, STDIN_FILENO)");
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
873
perror_plus("close");
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
886
if(helperdir_fd == -1){
888
_exit(EX_UNAVAILABLE);
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
906
#pragma GCC diagnostic pop
908
perror_plus("fexecve");
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
928
if(kill(pid, SIGTERM) == -1){
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
937
} while(pret == -1 and errno == EINTR);
939
perror_plus("waitpid");
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
965
return add_delete_local_route(true, address, if_index);
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
974
return add_delete_local_route(false, address, if_index);
595
977
/* Called when a Mandos server is found */
596
static int start_mandos_communication(const char *ip, uint16_t port,
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
597
980
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
599
982
int ret, tcp_sd = -1;
602
struct sockaddr_in in;
603
struct sockaddr_in6 in6;
984
struct sockaddr_storage to;
605
985
char *buffer = NULL;
606
986
char *decrypted_buffer = NULL;
607
987
size_t buffer_length = 0;
708
1115
if(if_indextoname((unsigned int)if_index, interface) == NULL){
709
1116
perror_plus("if_indextoname");
711
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
712
ip, interface, port);
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
715
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
718
1125
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
719
1126
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");
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1188
route_added = add_local_route(ip, if_index);
1194
if(errno != ECONNREFUSED or debug){
1196
perror_plus("connect");
761
1209
const char *out = mandos_protocol_version;
999
1462
char ip[AVAHI_ADDRESS_STR_MAX];
1000
1463
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);
1465
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1466
PRIdMAX ") on port %" PRIu16 "\n", name,
1467
host_name, ip, (intmax_t)interface, port);
1006
int ret = start_mandos_communication(ip, port, interface,
1007
avahi_proto_to_af(proto));
1469
int ret = start_mandos_communication(ip, (in_port_t)port,
1471
avahi_proto_to_af(proto),
1009
avahi_simple_poll_quit(mc.simple_poll);
1474
avahi_simple_poll_quit(simple_poll);
1011
ret = add_server(ip, port, interface,
1012
avahi_proto_to_af(proto));
1476
if(not add_server(ip, (in_port_t)port, interface,
1477
avahi_proto_to_af(proto),
1478
&((mandos_context*)mc)->current_server)){
1479
fprintf_plus(stderr, "Failed to add server \"%s\" to server"
1078
1554
signal_received = sig;
1079
1555
int old_errno = errno;
1080
1556
/* set main loop to exit */
1081
if(mc.simple_poll != NULL){
1082
avahi_simple_poll_quit(mc.simple_poll);
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1084
1560
errno = old_errno;
1563
__attribute__((nonnull, warn_unused_result))
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1571
perror_plus("socket");
1575
strcpy(ifr->ifr_name, ifname);
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1580
perror_plus("ioctl SIOCGIFFLAGS");
1588
__attribute__((nonnull, warn_unused_result))
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1591
/* Reject the loopback device */
1592
if(ifr->ifr_flags & IFF_LOOPBACK){
1594
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1599
/* Accept point-to-point devices only if connect_to is specified */
1600
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1602
fprintf_plus(stderr, "Accepting point-to-point interface"
1603
" \"%s\"\n", ifname);
1607
/* Otherwise, reject non-broadcast-capable devices */
1608
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1610
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1611
" \"%s\"\n", ifname);
1615
/* Reject non-ARP interfaces (including dummy interfaces) */
1616
if(ifr->ifr_flags & IFF_NOARP){
1618
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1624
/* Accept this device */
1626
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1088
1632
* This function determines if a directory entry in /sys/class/net
1089
1633
* corresponds to an acceptable network device.
1090
1634
* (This function is passed to scandir(3) as a filter function.)
1636
__attribute__((nonnull, warn_unused_result))
1092
1637
int good_interface(const struct dirent *if_entry){
1094
char *flagname = NULL;
1095
1638
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",
1643
if(not get_flags(if_entry->d_name, &ifr)){
1645
fprintf_plus(stderr, "Failed to get flags for interface "
1646
"\"%s\"\n", if_entry->d_name);
1651
if(not good_flags(if_entry->d_name, &ifr)){
1658
* This function determines if a network interface is up.
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1663
if(not get_flags(interface, &ifr)){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1675
* This function determines if a network interface is running
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1680
if(not get_flags(interface, &ifr)){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1691
__attribute__((nonnull, pure, warn_unused_result))
1192
1692
int notdotentries(const struct dirent *direntry){
1193
1693
/* Skip "." and ".." */
1194
1694
if(direntry->d_name[0] == '.'
1203
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
int runnable_hook(const struct dirent *direntry){
1710
if((direntry->d_name)[0] == '\0'){
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
"abcdefghijklmnopqrstuvwxyz"
1719
if((direntry->d_name)[sret] != '\0'){
1720
/* Contains non-allowed characters */
1722
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1731
perror_plus("Could not stat hook");
1735
if(not (S_ISREG(st.st_mode))){
1736
/* Not a regular file */
1738
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1743
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1744
/* Not executable */
1746
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1752
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1205
1762
struct timespec now;
1206
1763
struct timespec waited_time;
1207
1764
intmax_t block_time;
1210
if(mc.current_server == NULL){
1213
"Wait until first server is found. No timeout!\n");
1767
if(mc->current_server == NULL){
1769
fprintf_plus(stderr, "Wait until first server is found."
1215
1772
ret = avahi_simple_poll_iterate(s, -1);
1218
fprintf(stderr, "Check current_server if we should run it,"
1775
fprintf_plus(stderr, "Check current_server if we should run"
1221
1778
/* the current time */
1222
1779
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1227
1784
/* Calculating in ms how long time between now and server
1228
1785
who we visted longest time ago. Now - last seen. */
1229
1786
waited_time.tv_sec = (now.tv_sec
1230
- mc.current_server->last_seen.tv_sec);
1787
- mc->current_server->last_seen.tv_sec);
1231
1788
waited_time.tv_nsec = (now.tv_nsec
1232
- mc.current_server->last_seen.tv_nsec);
1789
- mc->current_server->last_seen.tv_nsec);
1233
1790
/* total time is 10s/10,000ms.
1234
1791
Converting to s from ms by dividing by 1,000,
1235
1792
and ns to ms by dividing by 1,000,000. */
1236
1793
block_time = ((retry_interval
1237
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1238
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1241
fprintf(stderr, "Blocking for %ld ms\n", block_time);
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1244
1802
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);
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1250
avahi_simple_poll_quit(mc.simple_poll);
1808
avahi_simple_poll_quit(s);
1253
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1254
&mc.current_server->last_seen);
1812
&mc->current_server->last_seen);
1256
1814
perror_plus("clock_gettime");
1259
mc.current_server = mc.current_server->next;
1817
mc->current_server = mc->current_server->next;
1260
1818
block_time = 0; /* Call avahi to find new Mandos
1261
1819
servers, but don't block */
1264
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1267
if (ret > 0 or errno != EINTR) {
1825
if(ret > 0 or errno != EINTR){
1268
1826
return (ret != 1) ? ret : 0;
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1846
perror_plus("open");
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1862
#endif /* not __GLIBC__ */
1864
perror_plus("scandir");
1867
struct dirent *direntry;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1880
pid_t hook_pid = fork();
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1886
perror_plus("Failed to raise privileges");
1893
perror_plus("setgid");
1896
/* Reset supplementary groups */
1898
ret = setgroups(0, NULL);
1900
perror_plus("setgroups");
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1905
perror_plus("setenv");
1908
ret = setenv("DEVICE", interface, 1);
1910
perror_plus("setenv");
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1915
perror_plus("setenv");
1918
ret = setenv("MODE", mode, 1);
1920
perror_plus("setenv");
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1926
perror_plus("asprintf");
1929
ret = setenv("DELAY", delaystring, 1);
1932
perror_plus("setenv");
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1939
perror_plus("setenv");
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1954
ret = dup2(devnull, STDIN_FILENO);
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1961
perror_plus("close");
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1976
perror_plus("fork");
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2025
error_t old_errno = errno;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2049
network.ifr_flags |= IFF_UP; /* set flag */
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2054
perror_plus("socket");
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2062
perror_plus("close");
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2077
perror_plus("Failed to raise privileges");
2082
bool restore_loglevel = false;
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2090
restore_loglevel = true;
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2103
#endif /* __linux__ */
2105
/* If raise_privileges() succeeded above */
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2111
perror_plus("Failed to lower privileges");
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2118
perror_plus("close");
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2173
perror_plus("socket");
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2187
perror_plus("Failed to raise privileges");
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2193
/* If raise_privileges() succeeded above */
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2199
perror_plus("Failed to lower privileges");
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2206
perror_plus("close");
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1274
2224
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
1275
2229
AvahiSServiceBrowser *sb = NULL;
1278
2232
intmax_t tmpmax;
1280
2234
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;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
1289
2240
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1290
2241
const char *seckey = PATHDIR "/" SECKEY;
1291
2242
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
1293
2245
bool gnutls_initialized = false;
1294
2246
bool gpgme_initialized = false;
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2431
perror_plus("Failed to raise privileges");
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2436
int seckey_fd = open(seckey, O_RDONLY);
2437
if(seckey_fd == -1){
2438
perror_plus("open");
2440
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2442
perror_plus("fstat");
2444
if(S_ISREG(st.st_mode)
2445
and st.st_uid == 0 and st.st_gid == 0){
2446
ret = fchown(seckey_fd, uid, gid);
2448
perror_plus("fchown");
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
int pubkey_fd = open(pubkey, O_RDONLY);
2458
if(pubkey_fd == -1){
2459
perror_plus("open");
2461
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2463
perror_plus("fstat");
2465
if(S_ISREG(st.st_mode)
2466
and st.st_uid == 0 and st.st_gid == 0){
2467
ret = fchown(pubkey_fd, uid, gid);
2469
perror_plus("fchown");
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2477
/* Lower privileges */
2478
ret_errno = lower_privileges();
2481
perror_plus("Failed to lower privileges");
2486
/* Remove invalid interface names (except "none") */
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2503
/* Run network hooks */
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
1460
2519
avahi_set_log_function(empty_log);
1463
if(interface[0] == '\0'){
1464
struct dirent **direntries;
1465
ret = scandir(sys_class_net, &direntries, good_interface,
1468
/* Pick the first good interface */
1469
interface = strdup(direntries[0]->d_name);
1471
fprintf(stderr, "Using interface \"%s\"\n", interface);
1473
if(interface == NULL){
1474
perror_plus("malloc");
1476
exitcode = EXIT_FAILURE;
1482
fprintf(stderr, "Could not find a network interface\n");
1483
exitcode = EXIT_FAILURE;
1488
2522
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1489
2523
from the signal handler */
1490
2524
/* Initialize the pseudo-RNG for Avahi */
1491
2525
srand((unsigned int) time(NULL));
1492
mc.simple_poll = avahi_simple_poll_new();
1493
if(mc.simple_poll == NULL){
1494
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
2528
fprintf_plus(stderr,
2529
"Avahi: Failed to create simple poll object.\n");
1495
2530
exitcode = EX_UNAVAILABLE;
1562
/* If the interface is down, bring it up */
1563
if(strcmp(interface, "none") != 0){
1564
if_index = (AvahiIfIndex) if_nametoindex(interface);
1566
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1567
exitcode = EX_UNAVAILABLE;
1575
/* Re-raise priviliges */
1579
perror_plus("seteuid");
1583
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1584
messages about the network interface to mess up the prompt */
1585
ret = klogctl(8, NULL, 5);
1586
bool restore_loglevel = true;
1588
restore_loglevel = false;
1589
perror_plus("klogctl");
1591
#endif /* __linux__ */
1593
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1595
perror_plus("socket");
1596
exitcode = EX_OSERR;
1598
if(restore_loglevel){
1599
ret = klogctl(7, NULL, 0);
1601
perror_plus("klogctl");
1604
#endif /* __linux__ */
1605
/* Lower privileges */
1609
perror_plus("seteuid");
1613
strcpy(network.ifr_name, interface);
1614
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1616
perror_plus("ioctl SIOCGIFFLAGS");
1618
if(restore_loglevel){
1619
ret = klogctl(7, NULL, 0);
1621
perror_plus("klogctl");
1624
#endif /* __linux__ */
1625
exitcode = EX_OSERR;
1626
/* Lower privileges */
1630
perror_plus("seteuid");
1634
if((network.ifr_flags & IFF_UP) == 0){
1635
network.ifr_flags |= IFF_UP;
1636
take_down_interface = true;
1637
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1639
take_down_interface = false;
1640
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1641
exitcode = EX_OSERR;
1643
if(restore_loglevel){
1644
ret = klogctl(7, NULL, 0);
1646
perror_plus("klogctl");
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2618
free(direntries[i]);
2625
fprintf_plus(stderr, "Could not find a network interface\n");
2626
exitcode = EXIT_FAILURE;
2631
/* Bring up interfaces which are down, and remove any "none"s */
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
1649
#endif /* __linux__ */
1650
/* Lower privileges */
1654
perror_plus("seteuid");
1659
/* Sleep checking until interface is running.
1660
Check every 0.25s, up to total time of delay */
1661
for(int i=0; i < delay * 4; i++){
1662
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1664
perror_plus("ioctl SIOCGIFFLAGS");
1665
} else if(network.ifr_flags & IFF_RUNNING){
1668
struct timespec sleeptime = { .tv_nsec = 250000000 };
1669
ret = nanosleep(&sleeptime, NULL);
1670
if(ret == -1 and errno != EINTR){
1671
perror_plus("nanosleep");
1674
if(not take_down_interface){
1675
/* We won't need the socket anymore */
1676
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1678
perror_plus("close");
1682
if(restore_loglevel){
1683
/* Restores kernel loglevel to default */
1684
ret = klogctl(7, NULL, 0);
1686
perror_plus("klogctl");
1689
#endif /* __linux__ */
1690
/* Lower privileges */
1692
if(take_down_interface){
1693
/* Lower privileges */
1696
perror_plus("seteuid");
1699
/* Lower privileges permanently */
1702
perror_plus("setuid");
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2656
perror_plus("Failed to bring up interface");
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2662
perror_plus("argz_add");
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1711
ret = init_gnutls_global(pubkey, seckey);
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
1713
fprintf(stderr, "init_gnutls_global failed\n");
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
1714
2688
exitcode = EX_UNAVAILABLE;
1888
2884
if(gpgme_initialized){
1889
2885
gpgme_release(mc.ctx);
1892
2888
/* Cleans up the circular linked list of Mandos servers the client
1894
2890
if(mc.current_server != NULL){
1895
2891
mc.current_server->prev->next = NULL;
1896
2892
while(mc.current_server != NULL){
1897
2893
server *next = mc.current_server->next;
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2898
free((char *)(mc.current_server->ip));
2900
#pragma GCC diagnostic pop
1898
2902
free(mc.current_server);
1899
2903
mc.current_server = next;
1903
/* Take down the network interface */
1904
if(take_down_interface){
1905
/* Re-raise priviliges */
1909
perror_plus("seteuid");
2907
/* Re-raise privileges */
2909
ret_errno = raise_privileges();
2912
perror_plus("Failed to raise privileges");
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2919
/* Take down the network interfaces which were brought up */
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2925
ret_errno = take_down_interface(interface);
2928
perror_plus("Failed to take down interface");
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
1912
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1914
perror_plus("ioctl SIOCGIFFLAGS");
1915
} else if(network.ifr_flags & IFF_UP) {
1916
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1917
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1919
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1922
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1924
perror_plus("close");
1926
/* Lower privileges permanently */
1930
perror_plus("setuid");
2938
ret_errno = lower_privileges_permanently();
2941
perror_plus("Failed to lower privileges permanently");
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
1935
2948
/* Removes the GPGME temp directory and all files inside */
1936
if(tempdir_created){
2949
if(tempdir != NULL){
1937
2950
struct dirent **direntries = NULL;
1938
struct dirent *direntry = NULL;
1939
ret = scandir(tempdir, &direntries, notdotentries, alphasort);
1941
for(int i = 0; i < ret; i++){
1942
direntry = direntries[i];
1943
char *fullname = NULL;
1944
ret = asprintf(&fullname, "%s/%s", tempdir,
1947
perror_plus("asprintf");
1950
ret = remove(fullname);
1952
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2978
free(direntries[i]);
2981
/* need to clean even if 0 because man page doesn't specify */
2983
if(numentries == -1){
2984
perror_plus("scandir");
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
1959
/* need to be cleaned even if ret == 0 because man page doesn't
1963
perror_plus("scandir");
1965
ret = rmdir(tempdir);
1966
if(ret == -1 and errno != ENOENT){
1967
perror_plus("rmdir");
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));