26
26
* along with this program. If not, see
27
27
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@recompile.se>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
32
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
33
#ifndef _LARGEFILE_SOURCE
34
34
#define _LARGEFILE_SOURCE
35
#endif /* not _LARGEFILE_SOURCE */
36
36
#ifndef _FILE_OFFSET_BITS
37
37
#define _FILE_OFFSET_BITS 64
38
#endif /* not _FILE_OFFSET_BITS */
40
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
44
#include <stdint.h> /* uint16_t, uint32_t, intptr_t */
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy() */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
51
#include <sys/ioctl.h> /* ioctl */
52
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
53
sockaddr_in6, PF_INET6,
54
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
57
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect(),
60
#include <fcntl.h> /* open(), unlinkat() */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
61
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
63
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
68
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
68
SIOCSIFFLAGS, if_indextoname(),
70
69
if_nametoindex(), IF_NAMESIZE */
133
120
#define PATHDIR "/conf/conf.d/mandos"
134
121
#define SECKEY "seckey.txt"
135
122
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
124
bool debug = false;
139
125
static const char mandos_protocol_version[] = "1";
140
126
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
129
/* Used for passing in values through the Avahi callback functions */
131
AvahiSimplePoll *simple_poll;
162
132
AvahiServer *server;
163
133
gnutls_certificate_credentials_t cred;
164
134
unsigned int dh_bits;
165
135
gnutls_dh_params_t dh_params;
166
136
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
138
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
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));
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
199
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
147
* bytes. "buffer_capacity" is how much is currently allocated,
201
148
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
150
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
151
size_t buffer_capacity){
206
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
157
buffer_capacity += BUFFER_SIZE;
218
159
return buffer_capacity;
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){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
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){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
270
163
* Initialize GPGME.
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,
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
277
167
gpgme_error_t rc;
278
168
gpgme_engine_info_t engine_info;
281
172
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
174
bool import_key(const char *filename){
286
177
gpgme_data_t pgp_data;
288
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
186
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
192
rc = gpgme_op_import(mc.ctx, pgp_data);
302
193
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
203
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
208
fprintf(stderr, "Initializing GPGME\n");
321
212
gpgme_check_version(NULL);
322
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
214
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
216
gpgme_strsource(rc), gpgme_strerror(rc));
329
/* Set GPGME home directory for the OpenPGP engine only */
220
/* Set GPGME home directory for the OpenPGP engine only */
330
221
rc = gpgme_get_engine_info(&engine_info);
331
222
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
336
227
while(engine_info != NULL){
379
266
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
385
272
/* Create new GPGME data buffer from memory cryptotext */
386
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
275
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
277
gpgme_strsource(rc), gpgme_strerror(rc));
394
281
/* Create new empty GPGME data buffer for the plaintext */
395
282
rc = gpgme_data_new(&dh_plain);
396
283
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
284
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
285
gpgme_strsource(rc), gpgme_strerror(rc));
400
286
gpgme_data_release(dh_crypto);
404
290
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
292
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
407
293
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
294
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
410
296
plaintext_length = -1;
412
298
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
299
result = gpgme_op_decrypt_result(mc.ctx);
414
300
if(result == NULL){
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
301
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
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);
303
fprintf(stderr, "Unsupported algorithm: %s\n",
304
result->unsupported_algorithm);
305
fprintf(stderr, "Wrong key usage: %u\n",
306
result->wrong_key_usage);
421
307
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
308
fprintf(stderr, "File name: %s\n", result->file_name);
424
310
gpgme_recipient_t recipient;
425
311
recipient = result->recipients;
426
312
while(recipient != NULL){
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
313
fprintf(stderr, "Public key algorithm: %s\n",
314
gpgme_pubkey_algo_name(recipient->pubkey_algo));
315
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
316
fprintf(stderr, "Secret key available: %s\n",
317
recipient->status == GPG_ERR_NO_SECKEY
434
319
recipient = recipient->next;
543
418
/* OpenPGP credentials */
544
ret = gnutls_certificate_allocate_credentials(&mc->cred);
419
gnutls_certificate_allocate_credentials(&mc.cred);
545
420
if(ret != GNUTLS_E_SUCCESS){
546
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
547
safer_gnutls_strerror(ret));
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
548
426
gnutls_global_deinit();
553
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
554
" secret key %s as GnuTLS credentials\n",
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
559
436
ret = gnutls_certificate_set_openpgp_key_file
560
(mc->cred, pubkeyfilename, seckeyfilename,
437
(mc.cred, pubkeyfilename, seckeyfilename,
561
438
GNUTLS_OPENPGP_FMT_BASE64);
562
439
if(ret != GNUTLS_E_SUCCESS){
564
"Error[%d] while reading the OpenPGP key pair ('%s',"
565
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
566
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
567
safer_gnutls_strerror(ret));
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
571
448
/* GnuTLS server initialization */
572
ret = gnutls_dh_params_init(&mc->dh_params);
573
if(ret != GNUTLS_E_SUCCESS){
574
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
575
" initialization: %s\n",
576
safer_gnutls_strerror(ret));
579
/* If a Diffie-Hellman parameters file was given, try to use it */
580
if(dhparamsfilename != NULL){
581
gnutls_datum_t params = { .data = NULL, .size = 0 };
583
int dhpfile = open(dhparamsfilename, O_RDONLY);
586
dhparamsfilename = NULL;
589
size_t params_capacity = 0;
591
params_capacity = incbuffer((char **)¶ms.data,
593
(size_t)params_capacity);
594
if(params_capacity == 0){
595
perror_plus("incbuffer");
598
dhparamsfilename = NULL;
601
ssize_t bytes_read = read(dhpfile,
602
params.data + params.size,
608
/* check bytes_read for failure */
613
dhparamsfilename = NULL;
616
params.size += (unsigned int)bytes_read;
618
if(params.data == NULL){
619
dhparamsfilename = NULL;
621
if(dhparamsfilename == NULL){
624
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
625
GNUTLS_X509_FMT_PEM);
626
if(ret != GNUTLS_E_SUCCESS){
627
fprintf_plus(stderr, "Failed to parse DH parameters in file"
628
" \"%s\": %s\n", dhparamsfilename,
629
safer_gnutls_strerror(ret));
630
dhparamsfilename = NULL;
634
if(dhparamsfilename == NULL){
635
if(mc->dh_bits == 0){
636
/* Find out the optimal number of DH bits */
637
/* Try to read the private key file */
638
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
640
int secfile = open(seckeyfilename, O_RDONLY);
645
size_t buffer_capacity = 0;
647
buffer_capacity = incbuffer((char **)&buffer.data,
649
(size_t)buffer_capacity);
650
if(buffer_capacity == 0){
651
perror_plus("incbuffer");
656
ssize_t bytes_read = read(secfile,
657
buffer.data + buffer.size,
663
/* check bytes_read for failure */
670
buffer.size += (unsigned int)bytes_read;
674
/* If successful, use buffer to parse private key */
675
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
676
if(buffer.data != NULL){
678
gnutls_openpgp_privkey_t privkey = NULL;
679
ret = gnutls_openpgp_privkey_init(&privkey);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error initializing OpenPGP key"
683
safer_gnutls_strerror(ret));
687
ret = gnutls_openpgp_privkey_import
688
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
689
if(ret != GNUTLS_E_SUCCESS){
690
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
691
safer_gnutls_strerror(ret));
697
/* Use private key to suggest an appropriate
699
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
700
gnutls_openpgp_privkey_deinit(privkey);
702
fprintf_plus(stderr, "This OpenPGP key implies using"
703
" a GnuTLS security parameter \"%s\".\n",
704
safe_string(gnutls_sec_param_get_name
710
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
711
/* Err on the side of caution */
712
sec_param = GNUTLS_SEC_PARAM_ULTRA;
714
fprintf_plus(stderr, "Falling back to security parameter"
716
safe_string(gnutls_sec_param_get_name
721
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
725
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
726
" implies %u DH bits; using that.\n",
727
safe_string(gnutls_sec_param_get_name
732
fprintf_plus(stderr, "Failed to get implied number of DH"
733
" bits for security parameter \"%s\"): %s\n",
734
safe_string(gnutls_sec_param_get_name
736
safer_gnutls_strerror(ret));
740
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
743
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
744
if(ret != GNUTLS_E_SUCCESS){
745
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
746
" bits): %s\n", mc->dh_bits,
747
safer_gnutls_strerror(ret));
751
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
757
gnutls_certificate_free_credentials(mc->cred);
468
gnutls_certificate_free_credentials(mc.cred);
758
469
gnutls_global_deinit();
759
gnutls_dh_params_deinit(mc->dh_params);
470
gnutls_dh_params_deinit(mc.dh_params);
763
__attribute__((nonnull, warn_unused_result))
764
static int init_gnutls_session(gnutls_session_t *session,
474
static int init_gnutls_session(gnutls_session_t *session){
767
476
/* GnuTLS session creation */
769
ret = gnutls_init(session, GNUTLS_SERVER);
773
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
477
ret = gnutls_init(session, GNUTLS_SERVER);
774
478
if(ret != GNUTLS_E_SUCCESS){
776
"Error in GnuTLS session initialization: %s\n",
777
safer_gnutls_strerror(ret));
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
480
safer_gnutls_strerror(ret));
783
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
785
gnutls_deinit(*session);
788
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
789
486
if(ret != GNUTLS_E_SUCCESS){
790
fprintf_plus(stderr, "Syntax error at: %s\n", err);
791
fprintf_plus(stderr, "GnuTLS error: %s\n",
792
safer_gnutls_strerror(ret));
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
793
490
gnutls_deinit(*session);
799
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
802
gnutls_deinit(*session);
805
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
806
497
if(ret != GNUTLS_E_SUCCESS){
807
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
808
safer_gnutls_strerror(ret));
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
499
safer_gnutls_strerror(ret));
809
500
gnutls_deinit(*session);
813
504
/* ignore client certificate if any. */
814
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
505
gnutls_certificate_server_set_request(*session,
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
820
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
821
515
__attribute__((unused)) const char *txt){}
823
/* Set effective uid to 0, return errno */
824
__attribute__((warn_unused_result))
825
error_t raise_privileges(void){
826
error_t old_errno = errno;
827
error_t ret_errno = 0;
828
if(seteuid(0) == -1){
835
/* Set effective and real user ID to 0. Return errno. */
836
__attribute__((warn_unused_result))
837
error_t raise_privileges_permanently(void){
838
error_t old_errno = errno;
839
error_t ret_errno = raise_privileges();
851
/* Set effective user ID to unprivileged saved user ID */
852
__attribute__((warn_unused_result))
853
error_t lower_privileges(void){
854
error_t old_errno = errno;
855
error_t ret_errno = 0;
856
if(seteuid(uid) == -1){
863
/* Lower privileges permanently */
864
__attribute__((warn_unused_result))
865
error_t lower_privileges_permanently(void){
866
error_t old_errno = errno;
867
error_t ret_errno = 0;
868
if(setuid(uid) == -1){
875
/* Helper function to add_local_route() and delete_local_route() */
876
__attribute__((nonnull, warn_unused_result))
877
static bool add_delete_local_route(const bool add,
879
AvahiIfIndex if_index){
881
char helper[] = "mandos-client-iprouteadddel";
882
char add_arg[] = "add";
883
char delete_arg[] = "delete";
884
char debug_flag[] = "--debug";
885
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
886
if(pluginhelperdir == NULL){
888
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
889
" variable not set; cannot run helper\n");
894
char interface[IF_NAMESIZE];
895
if(if_indextoname((unsigned int)if_index, interface) == NULL){
896
perror_plus("if_indextoname");
900
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
902
perror_plus("open(\"/dev/null\", O_RDONLY)");
908
/* Raise privileges */
909
errno = raise_privileges_permanently();
911
perror_plus("Failed to raise privileges");
912
/* _exit(EX_NOPERM); */
918
perror_plus("setgid");
921
/* Reset supplementary groups */
923
ret = setgroups(0, NULL);
925
perror_plus("setgroups");
929
ret = dup2(devnull, STDIN_FILENO);
931
perror_plus("dup2(devnull, STDIN_FILENO)");
934
ret = close(devnull);
936
perror_plus("close");
939
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
941
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
944
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
949
if(helperdir_fd == -1){
951
_exit(EX_UNAVAILABLE);
953
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
956
perror_plus("openat");
958
_exit(EX_UNAVAILABLE);
962
#pragma GCC diagnostic push
963
#pragma GCC diagnostic ignored "-Wcast-qual"
965
if(fexecve(helper_fd, (char *const [])
966
{ helper, add ? add_arg : delete_arg, (char *)address,
967
interface, debug ? debug_flag : NULL, NULL },
970
#pragma GCC diagnostic pop
972
perror_plus("fexecve");
984
pret = waitpid(pid, &status, 0);
985
if(pret == -1 and errno == EINTR and quit_now){
986
int errno_raising = 0;
987
if((errno = raise_privileges()) != 0){
988
errno_raising = errno;
989
perror_plus("Failed to raise privileges in order to"
990
" kill helper program");
992
if(kill(pid, SIGTERM) == -1){
995
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
996
perror_plus("Failed to lower privileges after killing"
1001
} while(pret == -1 and errno == EINTR);
1003
perror_plus("waitpid");
1006
if(WIFEXITED(status)){
1007
if(WEXITSTATUS(status) != 0){
1008
fprintf_plus(stderr, "Error: iprouteadddel exited"
1009
" with status %d\n", WEXITSTATUS(status));
1014
if(WIFSIGNALED(status)){
1015
fprintf_plus(stderr, "Error: iprouteadddel died by"
1016
" signal %d\n", WTERMSIG(status));
1019
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1023
__attribute__((nonnull, warn_unused_result))
1024
static bool add_local_route(const char *address,
1025
AvahiIfIndex if_index){
1027
fprintf_plus(stderr, "Adding route to %s\n", address);
1029
return add_delete_local_route(true, address, if_index);
1032
__attribute__((nonnull, warn_unused_result))
1033
static bool delete_local_route(const char *address,
1034
AvahiIfIndex if_index){
1036
fprintf_plus(stderr, "Removing route to %s\n", address);
1038
return add_delete_local_route(false, address, if_index);
517
sig_atomic_t quit_now = 0;
518
int signal_received = 0;
1041
520
/* Called when a Mandos server is found */
1042
__attribute__((nonnull, warn_unused_result))
1043
static int start_mandos_communication(const char *ip, in_port_t port,
521
static int start_mandos_communication(const char *ip, uint16_t port,
1044
522
AvahiIfIndex if_index,
1045
int af, mandos_context *mc){
1046
524
int ret, tcp_sd = -1;
1048
struct sockaddr_storage to;
527
struct sockaddr_in in;
528
struct sockaddr_in6 in6;
1049
530
char *buffer = NULL;
1050
char *decrypted_buffer = NULL;
531
char *decrypted_buffer;
1051
532
size_t buffer_length = 0;
1052
533
size_t buffer_capacity = 0;
1055
536
gnutls_session_t session;
1056
537
int pf; /* Protocol family */
1057
bool route_added = false;
1074
fprintf_plus(stderr, "Bad address family: %d\n", af);
551
fprintf(stderr, "Bad address family: %d\n", af);
1079
/* If the interface is specified and we have a list of interfaces */
1080
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1081
/* Check if the interface is one of the interfaces we are using */
1084
char *interface = NULL;
1085
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1087
if(if_nametoindex(interface) == (unsigned int)if_index){
1094
/* This interface does not match any in the list, so we don't
1095
connect to the server */
1097
char interface[IF_NAMESIZE];
1098
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1099
perror_plus("if_indextoname");
1101
fprintf_plus(stderr, "Skipping server on non-used interface"
1103
if_indextoname((unsigned int)if_index,
1111
ret = init_gnutls_session(&session, mc);
555
ret = init_gnutls_session(&session);
1117
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1118
PRIuMAX "\n", ip, (uintmax_t)port);
561
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
1121
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
565
tcp_sd = socket(pf, SOCK_STREAM, 0);
1124
perror_plus("socket");
1126
569
goto mandos_end;
1131
573
goto mandos_end;
576
memset(&to, 0, sizeof(to));
1134
577
if(af == AF_INET6){
1135
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1136
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to6->sin6_addr);
578
to.in6.sin6_family = (sa_family_t)af;
579
ret = inet_pton(af, ip, &to.in6.sin6_addr);
1138
580
} else { /* IPv4 */
1139
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1140
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1141
ret = inet_pton(af, ip, &to4->sin_addr);
581
to.in.sin_family = (sa_family_t)af;
582
ret = inet_pton(af, ip, &to.in.sin_addr);
1145
perror_plus("inet_pton");
1147
587
goto mandos_end;
1151
fprintf_plus(stderr, "Bad address: %s\n", ip);
590
fprintf(stderr, "Bad address: %s\n", ip);
1153
592
goto mandos_end;
1155
594
if(af == AF_INET6){
1156
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1157
if(IN6_IS_ADDR_LINKLOCAL
1158
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
595
to.in6.sin6_port = htons(port); /* Spurious warnings from
597
-Wunreachable-code */
599
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
600
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
1159
602
if(if_index == AVAHI_IF_UNSPEC){
1160
fprintf_plus(stderr, "An IPv6 link-local address is"
1161
" incomplete without a network interface\n");
603
fprintf(stderr, "An IPv6 link-local address is incomplete"
604
" without a network interface\n");
1163
606
goto mandos_end;
1165
608
/* Set the network interface number as scope */
1166
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
609
to.in6.sin6_scope_id = (uint32_t)if_index;
1169
((struct sockaddr_in *)&to)->sin_port = htons(port);
612
to.in.sin_port = htons(port); /* Spurious warnings from
614
-Wunreachable-code */
1174
618
goto mandos_end;
1178
622
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1179
623
char interface[IF_NAMESIZE];
1180
624
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1181
perror_plus("if_indextoname");
625
perror("if_indextoname");
1183
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1184
"\n", ip, interface, (uintmax_t)port);
627
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
628
ip, interface, port);
1187
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1188
ip, (uintmax_t)port);
631
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1190
634
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1191
635
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in6),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
ret = getnameinfo((struct sockaddr *)&to,
1199
sizeof(struct sockaddr_in),
1200
addrstr, sizeof(addrstr), NULL, 0,
1203
if(ret == EAI_SYSTEM){
1204
perror_plus("getnameinfo");
1205
} else if(ret != 0) {
1206
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1207
} else if(strcmp(addrstr, ip) != 0){
1208
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1219
ret = connect(tcp_sd, (struct sockaddr *)&to,
1220
sizeof(struct sockaddr_in6));
1222
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1223
sizeof(struct sockaddr_in));
1226
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1227
and if_index != AVAHI_IF_UNSPEC
1228
and connect_to == NULL
1229
and not route_added and
1230
((af == AF_INET6 and not
1231
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1233
or (af == AF_INET and
1234
/* Not a a IPv4LL address */
1235
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1236
& 0xFFFF0000L) != 0xA9FE0000L))){
1237
/* Work around Avahi bug - Avahi does not announce link-local
1238
addresses if it has a global address, so local hosts with
1239
*only* a link-local address (e.g. Mandos clients) cannot
1240
connect to a Mandos server announced by Avahi on a server
1241
host with a global address. Work around this by retrying
1242
with an explicit route added with the server's address.
1244
Avahi bug reference:
1245
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1246
https://bugs.debian.org/587961
1249
fprintf_plus(stderr, "Mandos server unreachable, trying"
1253
route_added = add_local_route(ip, if_index);
1259
if(errno != ECONNREFUSED or debug){
1261
perror_plus("connect");
638
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
641
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
647
if(strcmp(addrstr, ip) != 0){
648
fprintf(stderr, "Canonical address form: %s\n", addrstr);
658
ret = connect(tcp_sd, &to.in6, sizeof(to));
660
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
1274
672
const char *out = mandos_protocol_version;
1619
966
signal_received = sig;
1620
967
int old_errno = errno;
1621
/* set main loop to exit */
1622
if(simple_poll != NULL){
1623
avahi_simple_poll_quit(simple_poll);
1628
__attribute__((nonnull, warn_unused_result))
1629
bool get_flags(const char *ifname, struct ifreq *ifr){
1633
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1636
perror_plus("socket");
1640
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1641
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1642
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1646
perror_plus("ioctl SIOCGIFFLAGS");
1654
__attribute__((nonnull, warn_unused_result))
1655
bool good_flags(const char *ifname, const struct ifreq *ifr){
1657
/* Reject the loopback device */
1658
if(ifr->ifr_flags & IFF_LOOPBACK){
1660
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1665
/* Accept point-to-point devices only if connect_to is specified */
1666
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1668
fprintf_plus(stderr, "Accepting point-to-point interface"
1669
" \"%s\"\n", ifname);
1673
/* Otherwise, reject non-broadcast-capable devices */
1674
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1676
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1677
" \"%s\"\n", ifname);
1681
/* Reject non-ARP interfaces (including dummy interfaces) */
1682
if(ifr->ifr_flags & IFF_NOARP){
1684
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1690
/* Accept this device */
1692
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1698
* This function determines if a directory entry in /sys/class/net
1699
* corresponds to an acceptable network device.
1700
* (This function is passed to scandir(3) as a filter function.)
1702
__attribute__((nonnull, warn_unused_result))
1703
int good_interface(const struct dirent *if_entry){
1704
if(if_entry->d_name[0] == '.'){
1709
if(not get_flags(if_entry->d_name, &ifr)){
1711
fprintf_plus(stderr, "Failed to get flags for interface "
1712
"\"%s\"\n", if_entry->d_name);
1717
if(not good_flags(if_entry->d_name, &ifr)){
1724
* This function determines if a network interface is up.
1726
__attribute__((nonnull, warn_unused_result))
1727
bool interface_is_up(const char *interface){
1729
if(not get_flags(interface, &ifr)){
1731
fprintf_plus(stderr, "Failed to get flags for interface "
1732
"\"%s\"\n", interface);
1737
return (bool)(ifr.ifr_flags & IFF_UP);
1741
* This function determines if a network interface is running
1743
__attribute__((nonnull, warn_unused_result))
1744
bool interface_is_running(const char *interface){
1746
if(not get_flags(interface, &ifr)){
1748
fprintf_plus(stderr, "Failed to get flags for interface "
1749
"\"%s\"\n", interface);
1754
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1757
__attribute__((nonnull, pure, warn_unused_result))
1758
int notdotentries(const struct dirent *direntry){
1759
/* Skip "." and ".." */
1760
if(direntry->d_name[0] == '.'
1761
and (direntry->d_name[1] == '\0'
1762
or (direntry->d_name[1] == '.'
1763
and direntry->d_name[2] == '\0'))){
1769
/* Is this directory entry a runnable program? */
1770
__attribute__((nonnull, warn_unused_result))
1771
int runnable_hook(const struct dirent *direntry){
1776
if((direntry->d_name)[0] == '\0'){
1781
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1782
"abcdefghijklmnopqrstuvwxyz"
1785
if((direntry->d_name)[sret] != '\0'){
1786
/* Contains non-allowed characters */
1788
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1794
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1797
perror_plus("Could not stat hook");
1801
if(not (S_ISREG(st.st_mode))){
1802
/* Not a regular file */
1804
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1809
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1810
/* Not executable */
1812
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1818
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1824
__attribute__((nonnull, warn_unused_result))
1825
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1826
mandos_context *mc){
1828
struct timespec now;
1829
struct timespec waited_time;
1830
intmax_t block_time;
1833
if(mc->current_server == NULL){
1835
fprintf_plus(stderr, "Wait until first server is found."
1838
ret = avahi_simple_poll_iterate(s, -1);
1841
fprintf_plus(stderr, "Check current_server if we should run"
1844
/* the current time */
1845
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1847
perror_plus("clock_gettime");
1850
/* Calculating in ms how long time between now and server
1851
who we visted longest time ago. Now - last seen. */
1852
waited_time.tv_sec = (now.tv_sec
1853
- mc->current_server->last_seen.tv_sec);
1854
waited_time.tv_nsec = (now.tv_nsec
1855
- mc->current_server->last_seen.tv_nsec);
1856
/* total time is 10s/10,000ms.
1857
Converting to s from ms by dividing by 1,000,
1858
and ns to ms by dividing by 1,000,000. */
1859
block_time = ((retry_interval
1860
- ((intmax_t)waited_time.tv_sec * 1000))
1861
- ((intmax_t)waited_time.tv_nsec / 1000000));
1864
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1868
if(block_time <= 0){
1869
ret = start_mandos_communication(mc->current_server->ip,
1870
mc->current_server->port,
1871
mc->current_server->if_index,
1872
mc->current_server->af, mc);
1874
avahi_simple_poll_quit(s);
1877
ret = clock_gettime(CLOCK_MONOTONIC,
1878
&mc->current_server->last_seen);
1880
perror_plus("clock_gettime");
1883
mc->current_server = mc->current_server->next;
1884
block_time = 0; /* Call avahi to find new Mandos
1885
servers, but don't block */
1888
ret = avahi_simple_poll_iterate(s, (int)block_time);
1891
if(ret > 0 or errno != EINTR){
1892
return (ret != 1) ? ret : 0;
1898
__attribute__((nonnull))
1899
void run_network_hooks(const char *mode, const char *interface,
1901
struct dirent **direntries = NULL;
1902
if(hookdir_fd == -1){
1903
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1905
if(hookdir_fd == -1){
1906
if(errno == ENOENT){
1908
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1909
" found\n", hookdir);
1912
perror_plus("open");
1917
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1918
runnable_hook, alphasort);
1920
perror_plus("scandir");
1923
struct dirent *direntry;
1925
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1927
perror_plus("open(\"/dev/null\", O_RDONLY)");
1930
for(int i = 0; i < numhooks; i++){
1931
direntry = direntries[i];
1933
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1936
pid_t hook_pid = fork();
1939
/* Raise privileges */
1940
errno = raise_privileges_permanently();
1942
perror_plus("Failed to raise privileges");
1949
perror_plus("setgid");
1952
/* Reset supplementary groups */
1954
ret = setgroups(0, NULL);
1956
perror_plus("setgroups");
1959
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1961
perror_plus("setenv");
1964
ret = setenv("DEVICE", interface, 1);
1966
perror_plus("setenv");
1969
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1971
perror_plus("setenv");
1974
ret = setenv("MODE", mode, 1);
1976
perror_plus("setenv");
1980
ret = asprintf(&delaystring, "%f", (double)delay);
1982
perror_plus("asprintf");
1985
ret = setenv("DELAY", delaystring, 1);
1988
perror_plus("setenv");
1992
if(connect_to != NULL){
1993
ret = setenv("CONNECT", connect_to, 1);
1995
perror_plus("setenv");
1999
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2003
perror_plus("openat");
2004
_exit(EXIT_FAILURE);
2006
if(close(hookdir_fd) == -1){
2007
perror_plus("close");
2008
_exit(EXIT_FAILURE);
2010
ret = dup2(devnull, STDIN_FILENO);
2012
perror_plus("dup2(devnull, STDIN_FILENO)");
2015
ret = close(devnull);
2017
perror_plus("close");
2020
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2022
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2025
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2027
perror_plus("fexecve");
2028
_exit(EXIT_FAILURE);
2032
perror_plus("fork");
2037
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2038
perror_plus("waitpid");
2042
if(WIFEXITED(status)){
2043
if(WEXITSTATUS(status) != 0){
2044
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2045
" with status %d\n", direntry->d_name,
2046
WEXITSTATUS(status));
2050
} else if(WIFSIGNALED(status)){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2052
" signal %d\n", direntry->d_name,
2057
fprintf_plus(stderr, "Warning: network hook \"%s\""
2058
" crashed\n", direntry->d_name);
2064
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2070
if(close(hookdir_fd) == -1){
2071
perror_plus("close");
2078
__attribute__((nonnull, warn_unused_result))
2079
error_t bring_up_interface(const char *const interface,
2081
error_t old_errno = errno;
2083
struct ifreq network;
2084
unsigned int if_index = if_nametoindex(interface);
2086
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2096
if(not interface_is_up(interface)){
2097
error_t ret_errno = 0, ioctl_errno = 0;
2098
if(not get_flags(interface, &network)){
2100
fprintf_plus(stderr, "Failed to get flags for interface "
2101
"\"%s\"\n", interface);
2105
network.ifr_flags |= IFF_UP; /* set flag */
2107
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2110
perror_plus("socket");
2118
perror_plus("close");
2125
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2129
/* Raise privileges */
2130
ret_errno = raise_privileges();
2133
perror_plus("Failed to raise privileges");
2138
bool restore_loglevel = false;
2140
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2141
messages about the network interface to mess up the prompt */
2142
ret_linux = klogctl(8, NULL, 5);
2143
if(ret_linux == -1){
2144
perror_plus("klogctl");
2146
restore_loglevel = true;
2149
#endif /* __linux__ */
2150
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2151
ioctl_errno = errno;
2153
if(restore_loglevel){
2154
ret_linux = klogctl(7, NULL, 0);
2155
if(ret_linux == -1){
2156
perror_plus("klogctl");
2159
#endif /* __linux__ */
2161
/* If raise_privileges() succeeded above */
2163
/* Lower privileges */
2164
ret_errno = lower_privileges();
2167
perror_plus("Failed to lower privileges");
2171
/* Close the socket */
2174
perror_plus("close");
2177
if(ret_setflags == -1){
2178
errno = ioctl_errno;
2179
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2184
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2188
/* Sleep checking until interface is running.
2189
Check every 0.25s, up to total time of delay */
2190
for(int i=0; i < delay * 4; i++){
2191
if(interface_is_running(interface)){
2194
struct timespec sleeptime = { .tv_nsec = 250000000 };
2195
ret = nanosleep(&sleeptime, NULL);
2196
if(ret == -1 and errno != EINTR){
2197
perror_plus("nanosleep");
2205
__attribute__((nonnull, warn_unused_result))
2206
error_t take_down_interface(const char *const interface){
2207
error_t old_errno = errno;
2208
struct ifreq network;
2209
unsigned int if_index = if_nametoindex(interface);
2211
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2215
if(interface_is_up(interface)){
2216
error_t ret_errno = 0, ioctl_errno = 0;
2217
if(not get_flags(interface, &network) and debug){
2219
fprintf_plus(stderr, "Failed to get flags for interface "
2220
"\"%s\"\n", interface);
2224
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2226
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2229
perror_plus("socket");
2235
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2239
/* Raise privileges */
2240
ret_errno = raise_privileges();
2243
perror_plus("Failed to raise privileges");
2246
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2247
ioctl_errno = errno;
2249
/* If raise_privileges() succeeded above */
2251
/* Lower privileges */
2252
ret_errno = lower_privileges();
2255
perror_plus("Failed to lower privileges");
2259
/* Close the socket */
2260
int ret = close(sd);
2262
perror_plus("close");
2265
if(ret_setflags == -1){
2266
errno = ioctl_errno;
2267
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2272
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
968
if(mc.simple_poll != NULL){
969
avahi_simple_poll_quit(mc.simple_poll);
2280
974
int main(int argc, char *argv[]){
2281
mandos_context mc = { .server = NULL, .dh_bits = 0,
2282
.priority = "SECURE256:!CTYPE-X.509"
2283
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2284
.current_server = NULL, .interfaces = NULL,
2285
.interfaces_size = 0 };
2286
975
AvahiSServiceBrowser *sb = NULL;
2289
978
intmax_t tmpmax;
2291
980
int exitcode = EXIT_SUCCESS;
2292
char *interfaces_to_take_down = NULL;
2293
size_t interfaces_to_take_down_size = 0;
2294
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2295
char old_tempdir[] = "/tmp/mandosXXXXXX";
2296
char *tempdir = NULL;
981
const char *interface = "eth0";
982
struct ifreq network;
984
bool take_down_interface = false;
987
char *connect_to = NULL;
988
char tempdir[] = "/tmp/mandosXXXXXX";
989
bool tempdir_created = false;
2297
990
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2298
991
const char *seckey = PATHDIR "/" SECKEY;
2299
992
const char *pubkey = PATHDIR "/" PUBKEY;
2300
const char *dh_params_file = NULL;
2301
char *interfaces_hooks = NULL;
2303
994
bool gnutls_initialized = false;
2304
995
bool gpgme_initialized = false;
2305
996
float delay = 2.5f;
2306
double retry_interval = 10; /* 10s between trying a server and
2307
retrying the same server again */
2309
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
998
struct sigaction old_sigterm_action;
2310
999
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2315
/* Lower any group privileges we might have, just to be safe */
2319
perror_plus("setgid");
2322
/* Lower user privileges (temporarily) */
2326
perror_plus("seteuid");
2334
1002
struct argp_option options[] = {
2335
1003
{ .name = "debug", .key = 128,
2432
1071
delay = strtof(arg, &tmp);
2433
1072
if(errno != 0 or tmp == arg or *tmp != '\0'){
2434
argp_error(state, "Bad delay");
2436
case 132: /* --retry */
2438
retry_interval = strtod(arg, &tmp);
2439
if(errno != 0 or tmp == arg or *tmp != '\0'
2440
or (retry_interval * 1000) > INT_MAX
2441
or retry_interval < 0){
2442
argp_error(state, "Bad retry interval");
2445
case 133: /* --network-hook-dir */
2449
* These reproduce what we would get without ARGP_NO_HELP
2451
case '?': /* --help */
2452
argp_state_help(state, state->out_stream,
2453
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2454
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2455
case -3: /* --usage */
2456
argp_state_help(state, state->out_stream,
2457
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2458
case 'V': /* --version */
2459
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2460
exit(argp_err_exit_status);
1073
fprintf(stderr, "Bad delay\n");
2463
1082
return ARGP_ERR_UNKNOWN;
2468
1087
struct argp argp = { .options = options, .parser = parse_opt,
2469
1088
.args_doc = "",
2470
1089
.doc = "Mandos client -- Get and decrypt"
2471
1090
" passwords from a Mandos server" };
2472
ret = argp_parse(&argp, argc, argv,
2473
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2480
perror_plus("argp_parse");
2481
exitcode = EX_OSERR;
2484
exitcode = EX_USAGE;
2490
/* Work around Debian bug #633582:
2491
<http://bugs.debian.org/633582> */
2493
/* Re-raise privileges */
2494
ret_errno = raise_privileges();
2497
perror_plus("Failed to raise privileges");
2501
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2502
int seckey_fd = open(seckey, O_RDONLY);
2503
if(seckey_fd == -1){
2504
perror_plus("open");
2506
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2508
perror_plus("fstat");
2510
if(S_ISREG(st.st_mode)
2511
and st.st_uid == 0 and st.st_gid == 0){
2512
ret = fchown(seckey_fd, uid, gid);
2514
perror_plus("fchown");
2522
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2523
int pubkey_fd = open(pubkey, O_RDONLY);
2524
if(pubkey_fd == -1){
2525
perror_plus("open");
2527
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2529
perror_plus("fstat");
2531
if(S_ISREG(st.st_mode)
2532
and st.st_uid == 0 and st.st_gid == 0){
2533
ret = fchown(pubkey_fd, uid, gid);
2535
perror_plus("fchown");
2543
if(dh_params_file != NULL
2544
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2545
int dhparams_fd = open(dh_params_file, O_RDONLY);
2546
if(dhparams_fd == -1){
2547
perror_plus("open");
2549
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2551
perror_plus("fstat");
2553
if(S_ISREG(st.st_mode)
2554
and st.st_uid == 0 and st.st_gid == 0){
2555
ret = fchown(dhparams_fd, uid, gid);
2557
perror_plus("fchown");
2565
/* Lower privileges */
2566
ret_errno = lower_privileges();
2569
perror_plus("Failed to lower privileges");
2574
/* Remove invalid interface names (except "none") */
2576
char *interface = NULL;
2577
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2579
if(strcmp(interface, "none") != 0
2580
and if_nametoindex(interface) == 0){
2581
if(interface[0] != '\0'){
2582
fprintf_plus(stderr, "Not using nonexisting interface"
2583
" \"%s\"\n", interface);
2585
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2591
/* Run network hooks */
2593
if(mc.interfaces != NULL){
2594
interfaces_hooks = malloc(mc.interfaces_size);
2595
if(interfaces_hooks == NULL){
2596
perror_plus("malloc");
2599
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2600
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2602
run_network_hooks("start", interfaces_hooks != NULL ?
2603
interfaces_hooks : "", delay);
1091
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1092
if(ret == ARGP_ERR_UNKNOWN){
1093
fprintf(stderr, "Unknown error while parsing arguments\n");
1094
exitcode = EXIT_FAILURE;
2645
1137
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2647
perror_plus("sigaction");
1139
perror("sigaction");
1140
return EXIT_FAILURE;
2650
1142
if(old_sigterm_action.sa_handler != SIG_IGN){
2651
1143
ret = sigaction(SIGINT, &sigterm_action, NULL);
2653
perror_plus("sigaction");
2654
exitcode = EX_OSERR;
1145
perror("sigaction");
1146
exitcode = EXIT_FAILURE;
2658
1150
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2660
perror_plus("sigaction");
1152
perror("sigaction");
1153
return EXIT_FAILURE;
2663
1155
if(old_sigterm_action.sa_handler != SIG_IGN){
2664
1156
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2666
perror_plus("sigaction");
2667
exitcode = EX_OSERR;
1158
perror("sigaction");
1159
exitcode = EXIT_FAILURE;
2671
1163
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2673
perror_plus("sigaction");
1165
perror("sigaction");
1166
return EXIT_FAILURE;
2676
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
2677
1169
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2679
perror_plus("sigaction");
2680
exitcode = EX_OSERR;
2685
/* If no interfaces were specified, make a list */
2686
if(mc.interfaces == NULL){
2687
struct dirent **direntries = NULL;
2688
/* Look for any good interfaces */
2689
ret = scandir(sys_class_net, &direntries, good_interface,
2692
/* Add all found interfaces to interfaces list */
2693
for(int i = 0; i < ret; ++i){
2694
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2695
direntries[i]->d_name);
2698
perror_plus("argz_add");
2699
free(direntries[i]);
2703
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2704
direntries[i]->d_name);
2706
free(direntries[i]);
2713
fprintf_plus(stderr, "Could not find a network interface\n");
2714
exitcode = EXIT_FAILURE;
2719
/* Bring up interfaces which are down, and remove any "none"s */
2721
char *interface = NULL;
2722
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2724
/* If interface name is "none", stop bringing up interfaces.
2725
Also remove all instances of "none" from the list */
2726
if(strcmp(interface, "none") == 0){
2727
argz_delete(&mc.interfaces, &mc.interfaces_size,
2730
while((interface = argz_next(mc.interfaces,
2731
mc.interfaces_size, interface))){
2732
if(strcmp(interface, "none") == 0){
2733
argz_delete(&mc.interfaces, &mc.interfaces_size,
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1177
/* If the interface is down, bring it up */
1178
if(interface[0] != '\0'){
1179
if_index = (AvahiIfIndex) if_nametoindex(interface);
1181
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1182
exitcode = EXIT_FAILURE;
1191
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1192
messages to mess up the prompt */
1193
ret = klogctl(8, NULL, 5);
1194
bool restore_loglevel = true;
1196
restore_loglevel = false;
1199
#endif /* __linux__ */
1201
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1204
exitcode = EXIT_FAILURE;
1206
if(restore_loglevel){
1207
ret = klogctl(7, NULL, 0);
1212
#endif /* __linux__ */
1215
strcpy(network.ifr_name, interface);
1216
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1218
perror("ioctl SIOCGIFFLAGS");
1220
if(restore_loglevel){
1221
ret = klogctl(7, NULL, 0);
1226
#endif /* __linux__ */
1227
exitcode = EXIT_FAILURE;
1230
if((network.ifr_flags & IFF_UP) == 0){
1231
network.ifr_flags |= IFF_UP;
1232
take_down_interface = true;
1233
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1235
take_down_interface = false;
1236
perror("ioctl SIOCSIFFLAGS");
1237
exitcode = EXIT_FAILURE;
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1245
#endif /* __linux__ */
1249
/* sleep checking until interface is running */
1250
for(int i=0; i < delay * 4; i++){
1251
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1253
perror("ioctl SIOCGIFFLAGS");
1254
} else if(network.ifr_flags & IFF_RUNNING){
2740
bool interface_was_up = interface_is_up(interface);
2741
errno = bring_up_interface(interface, delay);
2742
if(not interface_was_up){
2744
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2745
" %s\n", interface, strerror(errno));
2747
errno = argz_add(&interfaces_to_take_down,
2748
&interfaces_to_take_down_size,
2751
perror_plus("argz_add");
2756
if(debug and (interfaces_to_take_down == NULL)){
2757
fprintf_plus(stderr, "No interfaces were brought up\n");
2761
/* If we only got one interface, explicitly use only that one */
2762
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2764
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2767
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2774
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2776
fprintf_plus(stderr, "init_gnutls_global failed\n");
2777
exitcode = EX_UNAVAILABLE;
1257
struct timespec sleeptime = { .tv_nsec = 250000000 };
1258
ret = nanosleep(&sleeptime, NULL);
1259
if(ret == -1 and errno != EINTR){
1260
perror("nanosleep");
1263
if(not take_down_interface){
1264
/* We won't need the socket anymore */
1265
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1271
if(restore_loglevel){
1272
/* Restores kernel loglevel to default */
1273
ret = klogctl(7, NULL, 0);
1278
#endif /* __linux__ */
1303
ret = init_gnutls_global(pubkey, seckey);
1305
fprintf(stderr, "init_gnutls_global failed\n");
1306
exitcode = EXIT_FAILURE;
2780
1309
gnutls_initialized = true;
2974
1471
gpgme_release(mc.ctx);
2977
/* Cleans up the circular linked list of Mandos servers the client
2979
if(mc.current_server != NULL){
2980
mc.current_server->prev->next = NULL;
2981
while(mc.current_server != NULL){
2982
server *next = mc.current_server->next;
2984
#pragma GCC diagnostic push
2985
#pragma GCC diagnostic ignored "-Wcast-qual"
2987
free((char *)(mc.current_server->ip));
2989
#pragma GCC diagnostic pop
2991
free(mc.current_server);
2992
mc.current_server = next;
2996
/* Re-raise privileges */
2998
ret_errno = raise_privileges();
3001
perror_plus("Failed to raise privileges");
3004
/* Run network hooks */
3005
run_network_hooks("stop", interfaces_hooks != NULL ?
3006
interfaces_hooks : "", delay);
3008
/* Take down the network interfaces which were brought up */
3010
char *interface = NULL;
3011
while((interface=argz_next(interfaces_to_take_down,
3012
interfaces_to_take_down_size,
3014
ret_errno = take_down_interface(interface);
3017
perror_plus("Failed to take down interface");
3020
if(debug and (interfaces_to_take_down == NULL)){
3021
fprintf_plus(stderr, "No interfaces needed to be taken"
3027
ret_errno = lower_privileges_permanently();
3030
perror_plus("Failed to lower privileges permanently");
3034
free(interfaces_to_take_down);
3035
free(interfaces_hooks);
3037
/* Removes the GPGME temp directory and all files inside */
3038
if(tempdir != NULL){
3039
struct dirent **direntries = NULL;
3040
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
3044
if(tempdir_fd == -1){
3045
perror_plus("open");
3047
int numentries = scandirat(tempdir_fd, ".", &direntries,
3048
notdotentries, alphasort);
3049
if(numentries >= 0){
3050
for(int i = 0; i < numentries; i++){
3051
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
3053
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
3054
" \"%s\", 0): %s\n", tempdir,
3055
direntries[i]->d_name, strerror(errno));
3057
free(direntries[i]);
3060
/* need to clean even if 0 because man page doesn't specify */
3062
if(numentries == -1){
3063
perror_plus("scandir");
3065
ret = rmdir(tempdir);
3066
if(ret == -1 and errno != ENOENT){
3067
perror_plus("rmdir");
1474
/* Take down the network interface */
1475
if(take_down_interface){
1476
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1478
perror("ioctl SIOCGIFFLAGS");
1479
} else if(network.ifr_flags & IFF_UP) {
1480
network.ifr_flags &= ~IFF_UP; /* clear flag */
1481
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1483
perror("ioctl SIOCSIFFLAGS");
1486
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1492
/* Removes the temp directory used by GPGME */
1493
if(tempdir_created){
1495
struct dirent *direntry;
1496
d = opendir(tempdir);
1498
if(errno != ENOENT){
1503
direntry = readdir(d);
1504
if(direntry == NULL){
1507
/* Skip "." and ".." */
1508
if(direntry->d_name[0] == '.'
1509
and (direntry->d_name[1] == '\0'
1510
or (direntry->d_name[1] == '.'
1511
and direntry->d_name[2] == '\0'))){
1514
char *fullname = NULL;
1515
ret = asprintf(&fullname, "%s/%s", tempdir,
1521
ret = remove(fullname);
1523
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1530
ret = rmdir(tempdir);
1531
if(ret == -1 and errno != ENOENT){
3075
1537
sigemptyset(&old_sigterm_action.sa_mask);
3076
1538
old_sigterm_action.sa_handler = SIG_DFL;
3077
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3078
&old_sigterm_action,
1539
ret = sigaction(signal_received, &old_sigterm_action, NULL);
3081
perror_plus("sigaction");
3084
ret = raise(signal_received);
3085
} while(ret != 0 and errno == EINTR);
3087
perror_plus("raise");
3090
TEMP_FAILURE_RETRY(pause());
1541
perror("sigaction");
1543
raise(signal_received);
3093
1546
return exitcode;