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
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
47
47
strtof(), abort() */
48
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* strcmp(), strlen(), strerror(),
50
asprintf(), strncpy(), strsignal()
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
52
51
#include <sys/ioctl.h> /* ioctl */
53
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
54
53
sockaddr_in6, PF_INET6,
55
54
SOCK_STREAM, uid_t, gid_t, open(),
57
#include <sys/stat.h> /* open(), S_ISREG */
56
#include <sys/stat.h> /* open() */
58
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
59
inet_pton(), connect(),
61
#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
62
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
64
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
66
#include <errno.h> /* perror(), errno, EINTR, EINVAL,
67
EAI_SYSTEM, ENETUNREACH,
68
EHOSTUNREACH, ECONNREFUSED, EPROTO,
69
EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
program_invocation_short_name */
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
72
66
#include <time.h> /* nanosleep(), time(), sleep() */
73
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
74
68
SIOCSIFFLAGS, if_indextoname(),
138
122
#define PATHDIR "/conf/conf.d/mandos"
139
123
#define SECKEY "seckey.txt"
140
124
#define PUBKEY "pubkey.txt"
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
143
126
bool debug = false;
144
127
static const char mandos_protocol_version[] = "1";
145
128
const char *argp_program_version = "mandos-client " VERSION;
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
129
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
147
130
static const char sys_class_net[] = "/sys/class/net";
148
131
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
154
/* Doubly linked list that need to be circularly linked when used */
155
typedef struct server{
158
AvahiIfIndex if_index;
160
struct timespec last_seen;
165
133
/* Used for passing in values through the Avahi callback functions */
135
AvahiSimplePoll *simple_poll;
167
136
AvahiServer *server;
168
137
gnutls_certificate_credentials_t cred;
169
138
unsigned int dh_bits;
170
139
gnutls_dh_params_t dh_params;
171
140
const char *priority;
173
server *current_server;
175
size_t interfaces_size;
176
142
} mandos_context;
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
144
/* global context so signal handler can reach it*/
145
mandos_context mc = { .simple_poll = NULL, .server = NULL,
146
.dh_bits = 1024, .priority = "SECURE256"
147
":!CTYPE-X.509:+CTYPE-OPENPGP" };
181
149
sig_atomic_t quit_now = 0;
182
150
int signal_received = 0;
184
/* Function to use when printing errors */
185
void perror_plus(const char *print_text){
187
fprintf(stderr, "Mandos plugin %s: ",
188
program_invocation_short_name);
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_start (ap, format);
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
204
153
* Make additional room in "buffer" for at least BUFFER_SIZE more
205
154
* bytes. "buffer_capacity" is how much is currently allocated,
206
155
* "buffer_length" is how much is already used.
208
__attribute__((nonnull, warn_unused_result))
209
157
size_t incbuffer(char **buffer, size_t buffer_length,
210
size_t buffer_capacity){
158
size_t buffer_capacity){
211
159
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
int old_errno = errno;
160
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
221
164
buffer_capacity += BUFFER_SIZE;
223
166
return buffer_capacity;
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
231
server *new_server = malloc(sizeof(server));
232
if(new_server == NULL){
233
perror_plus("malloc");
236
*new_server = (server){ .ip = strdup(ip),
238
.if_index = if_index,
240
if(new_server->ip == NULL){
241
perror_plus("strdup");
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
perror_plus("clock_gettime");
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
252
free((char *)(new_server->ip));
254
#pragma GCC diagnostic pop
259
/* Special case of first server */
260
if(*current_server == NULL){
261
new_server->next = new_server;
262
new_server->prev = new_server;
263
*current_server = new_server;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
268
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
275
170
* Initialize GPGME.
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
172
static bool init_gpgme(const char *seckey,
173
const char *pubkey, const char *tempdir){
282
174
gpgme_error_t rc;
283
175
gpgme_engine_info_t engine_info;
286
179
* Helper function to insert pub and seckey to the engine keyring.
288
bool import_key(const char * const filename){
181
bool import_key(const char *filename){
291
184
gpgme_data_t pgp_data;
293
186
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
299
192
rc = gpgme_data_new_from_fd(&pgp_data, fd);
300
193
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
194
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
306
rc = gpgme_op_import(mc->ctx, pgp_data);
199
rc = gpgme_op_import(mc.ctx, pgp_data);
307
200
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
201
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
202
gpgme_strsource(rc), gpgme_strerror(rc));
206
ret = (int)TEMP_FAILURE_RETRY(close(fd));
315
perror_plus("close");
317
210
gpgme_data_release(pgp_data);
322
fprintf_plus(stderr, "Initializing GPGME\n");
215
fprintf(stderr, "Initializing GPGME\n");
326
219
gpgme_check_version(NULL);
327
220
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
328
221
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
222
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
223
gpgme_strsource(rc), gpgme_strerror(rc));
334
/* Set GPGME home directory for the OpenPGP engine only */
227
/* Set GPGME home directory for the OpenPGP engine only */
335
228
rc = gpgme_get_engine_info(&engine_info);
336
229
if(rc != GPG_ERR_NO_ERROR){
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
230
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
231
gpgme_strsource(rc), gpgme_strerror(rc));
341
234
while(engine_info != NULL){
384
273
ssize_t plaintext_length = 0;
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
276
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
390
279
/* Create new GPGME data buffer from memory cryptotext */
391
280
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
393
282
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
283
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
284
gpgme_strsource(rc), gpgme_strerror(rc));
399
288
/* Create new empty GPGME data buffer for the plaintext */
400
289
rc = gpgme_data_new(&dh_plain);
401
290
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
291
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
292
gpgme_strsource(rc), gpgme_strerror(rc));
405
293
gpgme_data_release(dh_crypto);
409
297
/* Decrypt data from the cryptotext data buffer to the plaintext
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
299
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
412
300
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
301
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
415
303
plaintext_length = -1;
417
305
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
306
result = gpgme_op_decrypt_result(mc.ctx);
419
307
if(result == NULL){
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
308
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
310
fprintf(stderr, "Unsupported algorithm: %s\n",
311
result->unsupported_algorithm);
312
fprintf(stderr, "Wrong key usage: %u\n",
313
result->wrong_key_usage);
426
314
if(result->file_name != NULL){
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
315
fprintf(stderr, "File name: %s\n", result->file_name);
429
317
gpgme_recipient_t recipient;
430
318
recipient = result->recipients;
431
319
while(recipient != NULL){
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
320
fprintf(stderr, "Public key algorithm: %s\n",
321
gpgme_pubkey_algo_name(recipient->pubkey_algo));
322
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
323
fprintf(stderr, "Secret key available: %s\n",
324
recipient->status == GPG_ERR_NO_SECKEY
439
326
recipient = recipient->next;
541
425
/* OpenPGP credentials */
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
426
gnutls_certificate_allocate_credentials(&mc.cred);
543
427
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
428
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
432
safer_gnutls_strerror(ret));
433
gnutls_global_deinit();
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
438
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
439
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
556
443
ret = gnutls_certificate_set_openpgp_key_file
557
(mc->cred, pubkeyfilename, seckeyfilename,
444
(mc.cred, pubkeyfilename, seckeyfilename,
558
445
GNUTLS_OPENPGP_FMT_BASE64);
559
446
if(ret != GNUTLS_E_SUCCESS){
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
448
"Error[%d] while reading the OpenPGP key pair ('%s',"
449
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
450
fprintf(stderr, "The GnuTLS error is: %s\n",
451
safer_gnutls_strerror(ret));
568
455
/* GnuTLS server initialization */
569
ret = gnutls_dh_params_init(&mc->dh_params);
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
583
dhparamsfilename = NULL;
586
size_t params_capacity = 0;
588
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
595
dhparamsfilename = NULL;
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
605
/* check bytes_read for failure */
610
dhparamsfilename = NULL;
613
params.size += (unsigned int)bytes_read;
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
618
if(dhparamsfilename == NULL){
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
632
if(dhparamsfilename == NULL){
633
if(mc->dh_bits == 0){
634
/* Find out the optimal number of DH bits */
635
/* Try to read the private key file */
636
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
638
int secfile = open(seckeyfilename, O_RDONLY);
643
size_t buffer_capacity = 0;
645
buffer_capacity = incbuffer((char **)&buffer.data,
647
(size_t)buffer_capacity);
648
if(buffer_capacity == 0){
649
perror_plus("incbuffer");
654
ssize_t bytes_read = read(secfile,
655
buffer.data + buffer.size,
661
/* check bytes_read for failure */
668
buffer.size += (unsigned int)bytes_read;
672
/* If successful, use buffer to parse private key */
673
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
674
if(buffer.data != NULL){
676
gnutls_openpgp_privkey_t privkey = NULL;
677
ret = gnutls_openpgp_privkey_init(&privkey);
678
if(ret != GNUTLS_E_SUCCESS){
679
fprintf_plus(stderr, "Error initializing OpenPGP key"
681
safer_gnutls_strerror(ret));
685
ret = gnutls_openpgp_privkey_import
686
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
687
if(ret != GNUTLS_E_SUCCESS){
688
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
689
safer_gnutls_strerror(ret));
695
/* Use private key to suggest an appropriate
697
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
698
gnutls_openpgp_privkey_deinit(privkey);
700
fprintf_plus(stderr, "This OpenPGP key implies using"
701
" a GnuTLS security parameter \"%s\".\n",
702
safe_string(gnutls_sec_param_get_name
708
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
709
/* Err on the side of caution */
710
sec_param = GNUTLS_SEC_PARAM_ULTRA;
712
fprintf_plus(stderr, "Falling back to security parameter"
714
safe_string(gnutls_sec_param_get_name
719
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
723
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
724
" implies %u DH bits; using that.\n",
725
safe_string(gnutls_sec_param_get_name
730
fprintf_plus(stderr, "Failed to get implied number of DH"
731
" bits for security parameter \"%s\"): %s\n",
732
safe_string(gnutls_sec_param_get_name
734
safer_gnutls_strerror(ret));
738
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
741
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
742
if(ret != GNUTLS_E_SUCCESS){
743
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
744
" bits): %s\n", mc->dh_bits,
745
safer_gnutls_strerror(ret));
749
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
456
ret = gnutls_dh_params_init(&mc.dh_params);
457
if(ret != GNUTLS_E_SUCCESS){
458
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
459
" %s\n", safer_gnutls_strerror(ret));
462
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
463
if(ret != GNUTLS_E_SUCCESS){
464
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
465
safer_gnutls_strerror(ret));
469
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
755
gnutls_certificate_free_credentials(mc->cred);
756
gnutls_dh_params_deinit(mc->dh_params);
475
gnutls_certificate_free_credentials(mc.cred);
476
gnutls_global_deinit();
477
gnutls_dh_params_deinit(mc.dh_params);
760
__attribute__((nonnull, warn_unused_result))
761
static int init_gnutls_session(gnutls_session_t *session,
481
static int init_gnutls_session(gnutls_session_t *session){
764
483
/* GnuTLS session creation */
817
537
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
818
538
__attribute__((unused)) const char *txt){}
820
/* Set effective uid to 0, return errno */
821
__attribute__((warn_unused_result))
822
int raise_privileges(void){
823
int old_errno = errno;
825
if(seteuid(0) == -1){
832
/* Set effective and real user ID to 0. Return errno. */
833
__attribute__((warn_unused_result))
834
int raise_privileges_permanently(void){
835
int old_errno = errno;
836
int ret = raise_privileges();
848
/* Set effective user ID to unprivileged saved user ID */
849
__attribute__((warn_unused_result))
850
int lower_privileges(void){
851
int old_errno = errno;
853
if(seteuid(uid) == -1){
860
/* Lower privileges permanently */
861
__attribute__((warn_unused_result))
862
int lower_privileges_permanently(void){
863
int old_errno = errno;
865
if(setuid(uid) == -1){
872
/* Helper function to add_local_route() and delete_local_route() */
873
__attribute__((nonnull, warn_unused_result))
874
static bool add_delete_local_route(const bool add,
876
AvahiIfIndex if_index){
878
char helper[] = "mandos-client-iprouteadddel";
879
char add_arg[] = "add";
880
char delete_arg[] = "delete";
881
char debug_flag[] = "--debug";
882
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
883
if(pluginhelperdir == NULL){
885
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
886
" variable not set; cannot run helper\n");
891
char interface[IF_NAMESIZE];
892
if(if_indextoname((unsigned int)if_index, interface) == NULL){
893
perror_plus("if_indextoname");
897
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
899
perror_plus("open(\"/dev/null\", O_RDONLY)");
905
/* Raise privileges */
906
errno = raise_privileges_permanently();
908
perror_plus("Failed to raise privileges");
909
/* _exit(EX_NOPERM); */
915
perror_plus("setgid");
918
/* Reset supplementary groups */
920
ret = setgroups(0, NULL);
922
perror_plus("setgroups");
926
ret = dup2(devnull, STDIN_FILENO);
928
perror_plus("dup2(devnull, STDIN_FILENO)");
931
ret = close(devnull);
933
perror_plus("close");
936
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
938
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
941
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
946
if(helperdir_fd == -1){
948
_exit(EX_UNAVAILABLE);
950
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
953
perror_plus("openat");
955
_exit(EX_UNAVAILABLE);
959
#pragma GCC diagnostic push
960
#pragma GCC diagnostic ignored "-Wcast-qual"
962
if(fexecve(helper_fd, (char *const [])
963
{ helper, add ? add_arg : delete_arg, (char *)address,
964
interface, debug ? debug_flag : NULL, NULL },
967
#pragma GCC diagnostic pop
969
perror_plus("fexecve");
981
pret = waitpid(pid, &status, 0);
982
if(pret == -1 and errno == EINTR and quit_now){
983
int errno_raising = 0;
984
if((errno = raise_privileges()) != 0){
985
errno_raising = errno;
986
perror_plus("Failed to raise privileges in order to"
987
" kill helper program");
989
if(kill(pid, SIGTERM) == -1){
992
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
993
perror_plus("Failed to lower privileges after killing"
998
} while(pret == -1 and errno == EINTR);
1000
perror_plus("waitpid");
1003
if(WIFEXITED(status)){
1004
if(WEXITSTATUS(status) != 0){
1005
fprintf_plus(stderr, "Error: iprouteadddel exited"
1006
" with status %d\n", WEXITSTATUS(status));
1011
if(WIFSIGNALED(status)){
1012
fprintf_plus(stderr, "Error: iprouteadddel died by"
1013
" signal %d\n", WTERMSIG(status));
1016
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1020
__attribute__((nonnull, warn_unused_result))
1021
static bool add_local_route(const char *address,
1022
AvahiIfIndex if_index){
1024
fprintf_plus(stderr, "Adding route to %s\n", address);
1026
return add_delete_local_route(true, address, if_index);
1029
__attribute__((nonnull, warn_unused_result))
1030
static bool delete_local_route(const char *address,
1031
AvahiIfIndex if_index){
1033
fprintf_plus(stderr, "Removing route to %s\n", address);
1035
return add_delete_local_route(false, address, if_index);
1038
540
/* Called when a Mandos server is found */
1039
__attribute__((nonnull, warn_unused_result))
1040
static int start_mandos_communication(const char *ip, in_port_t port,
541
static int start_mandos_communication(const char *ip, uint16_t port,
1041
542
AvahiIfIndex if_index,
1042
int af, mandos_context *mc){
1043
544
int ret, tcp_sd = -1;
1045
struct sockaddr_storage to;
547
struct sockaddr_in in;
548
struct sockaddr_in6 in6;
1046
550
char *buffer = NULL;
1047
551
char *decrypted_buffer = NULL;
1048
552
size_t buffer_length = 0;
1176
651
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1177
652
char interface[IF_NAMESIZE];
1178
653
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1179
perror_plus("if_indextoname");
654
perror("if_indextoname");
1181
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1182
"\n", ip, interface, (uintmax_t)port);
656
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
657
ip, interface, port);
1185
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1186
ip, (uintmax_t)port);
660
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
1188
663
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1189
664
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1191
ret = getnameinfo((struct sockaddr *)&to,
1192
sizeof(struct sockaddr_in6),
1193
addrstr, sizeof(addrstr), NULL, 0,
1196
ret = getnameinfo((struct sockaddr *)&to,
1197
sizeof(struct sockaddr_in),
1198
addrstr, sizeof(addrstr), NULL, 0,
1201
if(ret == EAI_SYSTEM){
1202
perror_plus("getnameinfo");
1203
} else if(ret != 0) {
1204
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1205
} else if(strcmp(addrstr, ip) != 0){
1206
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1217
ret = connect(tcp_sd, (struct sockaddr *)&to,
1218
sizeof(struct sockaddr_in6));
1220
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1221
sizeof(struct sockaddr_in));
1224
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1225
and if_index != AVAHI_IF_UNSPEC
1226
and connect_to == NULL
1227
and not route_added and
1228
((af == AF_INET6 and not
1229
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1231
or (af == AF_INET and
1232
/* Not a a IPv4LL address */
1233
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1234
& 0xFFFF0000L) != 0xA9FE0000L))){
1235
/* Work around Avahi bug - Avahi does not announce link-local
1236
addresses if it has a global address, so local hosts with
1237
*only* a link-local address (e.g. Mandos clients) cannot
1238
connect to a Mandos server announced by Avahi on a server
1239
host with a global address. Work around this by retrying
1240
with an explicit route added with the server's address.
1242
Avahi bug reference:
1243
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1244
https://bugs.debian.org/587961
1247
fprintf_plus(stderr, "Mandos server unreachable, trying"
1251
route_added = add_local_route(ip, if_index);
1257
if(errno != ECONNREFUSED or debug){
1259
perror_plus("connect");
667
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
670
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
676
if(strcmp(addrstr, ip) != 0){
677
fprintf(stderr, "Canonical address form: %s\n", addrstr);
688
ret = connect(tcp_sd, &to.in6, sizeof(to));
690
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
693
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
1272
706
const char *out = mandos_protocol_version;
1628
1019
signal_received = sig;
1629
1020
int old_errno = errno;
1630
/* set main loop to exit */
1631
if(simple_poll != NULL){
1632
avahi_simple_poll_quit(simple_poll);
1021
if(mc.simple_poll != NULL){
1022
avahi_simple_poll_quit(mc.simple_poll);
1634
1024
errno = old_errno;
1637
__attribute__((nonnull, warn_unused_result))
1638
bool get_flags(const char *ifname, struct ifreq *ifr){
1642
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1645
perror_plus("socket");
1649
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1650
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1651
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1655
perror_plus("ioctl SIOCGIFFLAGS");
1663
__attribute__((nonnull, warn_unused_result))
1664
bool good_flags(const char *ifname, const struct ifreq *ifr){
1666
/* Reject the loopback device */
1667
if(ifr->ifr_flags & IFF_LOOPBACK){
1669
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1674
/* Accept point-to-point devices only if connect_to is specified */
1675
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1677
fprintf_plus(stderr, "Accepting point-to-point interface"
1678
" \"%s\"\n", ifname);
1682
/* Otherwise, reject non-broadcast-capable devices */
1683
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1685
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1686
" \"%s\"\n", ifname);
1690
/* Reject non-ARP interfaces (including dummy interfaces) */
1691
if(ifr->ifr_flags & IFF_NOARP){
1693
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1699
/* Accept this device */
1701
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1707
1028
* This function determines if a directory entry in /sys/class/net
1708
1029
* corresponds to an acceptable network device.
1709
1030
* (This function is passed to scandir(3) as a filter function.)
1711
__attribute__((nonnull, warn_unused_result))
1712
1032
int good_interface(const struct dirent *if_entry){
1034
char *flagname = NULL;
1713
1035
if(if_entry->d_name[0] == '.'){
1718
if(not get_flags(if_entry->d_name, &ifr)){
1720
fprintf_plus(stderr, "Failed to get flags for interface "
1721
"\"%s\"\n", if_entry->d_name);
1726
if(not good_flags(if_entry->d_name, &ifr)){
1733
* This function determines if a network interface is up.
1735
__attribute__((nonnull, warn_unused_result))
1736
bool interface_is_up(const char *interface){
1738
if(not get_flags(interface, &ifr)){
1740
fprintf_plus(stderr, "Failed to get flags for interface "
1741
"\"%s\"\n", interface);
1746
return (bool)(ifr.ifr_flags & IFF_UP);
1750
* This function determines if a network interface is running
1752
__attribute__((nonnull, warn_unused_result))
1753
bool interface_is_running(const char *interface){
1755
if(not get_flags(interface, &ifr)){
1757
fprintf_plus(stderr, "Failed to get flags for interface "
1758
"\"%s\"\n", interface);
1763
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1766
__attribute__((nonnull, pure, warn_unused_result))
1767
int notdotentries(const struct dirent *direntry){
1768
/* Skip "." and ".." */
1769
if(direntry->d_name[0] == '.'
1770
and (direntry->d_name[1] == '\0'
1771
or (direntry->d_name[1] == '.'
1772
and direntry->d_name[2] == '\0'))){
1778
/* Is this directory entry a runnable program? */
1779
__attribute__((nonnull, warn_unused_result))
1780
int runnable_hook(const struct dirent *direntry){
1785
if((direntry->d_name)[0] == '\0'){
1790
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1791
"abcdefghijklmnopqrstuvwxyz"
1794
if((direntry->d_name)[sret] != '\0'){
1795
/* Contains non-allowed characters */
1797
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1803
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1806
perror_plus("Could not stat hook");
1810
if(not (S_ISREG(st.st_mode))){
1811
/* Not a regular file */
1813
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1818
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1819
/* Not executable */
1821
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1038
int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,
1044
int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));
1051
typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */
1052
/* read line from flags_fd */
1053
ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */
1054
char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */
1055
flagstring[(size_t)to_read] = '\0';
1056
if(flagstring == NULL){
1062
ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,
1079
tmpmax = strtoimax(flagstring, &tmp, 0);
1080
if(errno != 0 or tmp == flagstring or (*tmp != '\0'
1081
and not (isspace(*tmp)))
1082
or tmpmax != (ifreq_flags)tmpmax){
1084
fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",
1085
flagstring, if_entry->d_name);
1091
ifreq_flags flags = (ifreq_flags)tmpmax;
1092
/* Reject the loopback device */
1093
if(flags & IFF_LOOPBACK){
1095
fprintf(stderr, "Rejecting loopback interface \"%s\"\n",
1100
/* Accept point-to-point devices only if connect_to is specified */
1101
if(connect_to != NULL and (flags & IFF_POINTOPOINT)){
1103
fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",
1108
/* Otherwise, reject non-broadcast-capable devices */
1109
if(not (flags & IFF_BROADCAST)){
1111
fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",
1116
/* Accept this device */
1827
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1118
fprintf(stderr, "Interface \"%s\" is acceptable\n",
1833
__attribute__((nonnull, warn_unused_result))
1834
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1835
mandos_context *mc){
1837
struct timespec now;
1838
struct timespec waited_time;
1839
intmax_t block_time;
1842
if(mc->current_server == NULL){
1844
fprintf_plus(stderr, "Wait until first server is found."
1847
ret = avahi_simple_poll_iterate(s, -1);
1850
fprintf_plus(stderr, "Check current_server if we should run"
1853
/* the current time */
1854
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1856
perror_plus("clock_gettime");
1859
/* Calculating in ms how long time between now and server
1860
who we visted longest time ago. Now - last seen. */
1861
waited_time.tv_sec = (now.tv_sec
1862
- mc->current_server->last_seen.tv_sec);
1863
waited_time.tv_nsec = (now.tv_nsec
1864
- mc->current_server->last_seen.tv_nsec);
1865
/* total time is 10s/10,000ms.
1866
Converting to s from ms by dividing by 1,000,
1867
and ns to ms by dividing by 1,000,000. */
1868
block_time = ((retry_interval
1869
- ((intmax_t)waited_time.tv_sec * 1000))
1870
- ((intmax_t)waited_time.tv_nsec / 1000000));
1873
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1877
if(block_time <= 0){
1878
ret = start_mandos_communication(mc->current_server->ip,
1879
mc->current_server->port,
1880
mc->current_server->if_index,
1881
mc->current_server->af, mc);
1883
avahi_simple_poll_quit(s);
1886
ret = clock_gettime(CLOCK_MONOTONIC,
1887
&mc->current_server->last_seen);
1889
perror_plus("clock_gettime");
1892
mc->current_server = mc->current_server->next;
1893
block_time = 0; /* Call avahi to find new Mandos
1894
servers, but don't block */
1897
ret = avahi_simple_poll_iterate(s, (int)block_time);
1900
if(ret > 0 or errno != EINTR){
1901
return (ret != 1) ? ret : 0;
1907
__attribute__((nonnull))
1908
void run_network_hooks(const char *mode, const char *interface,
1910
struct dirent **direntries = NULL;
1911
if(hookdir_fd == -1){
1912
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1914
if(hookdir_fd == -1){
1915
if(errno == ENOENT){
1917
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1918
" found\n", hookdir);
1921
perror_plus("open");
1926
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1927
runnable_hook, alphasort);
1929
perror_plus("scandir");
1932
struct dirent *direntry;
1934
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1936
perror_plus("open(\"/dev/null\", O_RDONLY)");
1939
for(int i = 0; i < numhooks; i++){
1940
direntry = direntries[i];
1942
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1945
pid_t hook_pid = fork();
1948
/* Raise privileges */
1949
errno = raise_privileges_permanently();
1951
perror_plus("Failed to raise privileges");
1958
perror_plus("setgid");
1961
/* Reset supplementary groups */
1963
ret = setgroups(0, NULL);
1965
perror_plus("setgroups");
1968
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1970
perror_plus("setenv");
1973
ret = setenv("DEVICE", interface, 1);
1975
perror_plus("setenv");
1978
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1980
perror_plus("setenv");
1983
ret = setenv("MODE", mode, 1);
1985
perror_plus("setenv");
1989
ret = asprintf(&delaystring, "%f", (double)delay);
1991
perror_plus("asprintf");
1994
ret = setenv("DELAY", delaystring, 1);
1997
perror_plus("setenv");
2001
if(connect_to != NULL){
2002
ret = setenv("CONNECT", connect_to, 1);
2004
perror_plus("setenv");
2008
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2012
perror_plus("openat");
2013
_exit(EXIT_FAILURE);
2015
if(close(hookdir_fd) == -1){
2016
perror_plus("close");
2017
_exit(EXIT_FAILURE);
2019
ret = dup2(devnull, STDIN_FILENO);
2021
perror_plus("dup2(devnull, STDIN_FILENO)");
2024
ret = close(devnull);
2026
perror_plus("close");
2029
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2031
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2034
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2036
perror_plus("fexecve");
2037
_exit(EXIT_FAILURE);
2041
perror_plus("fork");
2046
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2047
perror_plus("waitpid");
2051
if(WIFEXITED(status)){
2052
if(WEXITSTATUS(status) != 0){
2053
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2054
" with status %d\n", direntry->d_name,
2055
WEXITSTATUS(status));
2059
} else if(WIFSIGNALED(status)){
2060
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2061
" signal %d\n", direntry->d_name,
2066
fprintf_plus(stderr, "Warning: network hook \"%s\""
2067
" crashed\n", direntry->d_name);
2073
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2079
if(close(hookdir_fd) == -1){
2080
perror_plus("close");
2087
__attribute__((nonnull, warn_unused_result))
2088
int bring_up_interface(const char *const interface,
2090
int old_errno = errno;
2092
struct ifreq network;
2093
unsigned int if_index = if_nametoindex(interface);
2095
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2105
if(not interface_is_up(interface)){
2107
int ioctl_errno = 0;
2108
if(not get_flags(interface, &network)){
2110
fprintf_plus(stderr, "Failed to get flags for interface "
2111
"\"%s\"\n", interface);
2115
network.ifr_flags |= IFF_UP; /* set flag */
2117
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2120
perror_plus("socket");
2128
perror_plus("close");
2135
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2139
/* Raise privileges */
2140
ret_errno = raise_privileges();
2143
perror_plus("Failed to raise privileges");
2148
bool restore_loglevel = false;
2150
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2151
messages about the network interface to mess up the prompt */
2152
ret_linux = klogctl(8, NULL, 5);
2153
if(ret_linux == -1){
2154
perror_plus("klogctl");
2156
restore_loglevel = true;
2159
#endif /* __linux__ */
2160
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2161
ioctl_errno = errno;
2163
if(restore_loglevel){
2164
ret_linux = klogctl(7, NULL, 0);
2165
if(ret_linux == -1){
2166
perror_plus("klogctl");
2169
#endif /* __linux__ */
2171
/* If raise_privileges() succeeded above */
2173
/* Lower privileges */
2174
ret_errno = lower_privileges();
2177
perror_plus("Failed to lower privileges");
2181
/* Close the socket */
2184
perror_plus("close");
2187
if(ret_setflags == -1){
2188
errno = ioctl_errno;
2189
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2194
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2198
/* Sleep checking until interface is running.
2199
Check every 0.25s, up to total time of delay */
2200
for(int i = 0; i < delay * 4; i++){
2201
if(interface_is_running(interface)){
2204
struct timespec sleeptime = { .tv_nsec = 250000000 };
2205
ret = nanosleep(&sleeptime, NULL);
2206
if(ret == -1 and errno != EINTR){
2207
perror_plus("nanosleep");
2215
__attribute__((nonnull, warn_unused_result))
2216
int take_down_interface(const char *const interface){
2217
int old_errno = errno;
2218
struct ifreq network;
2219
unsigned int if_index = if_nametoindex(interface);
2221
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2225
if(interface_is_up(interface)){
2227
int ioctl_errno = 0;
2228
if(not get_flags(interface, &network) and debug){
2230
fprintf_plus(stderr, "Failed to get flags for interface "
2231
"\"%s\"\n", interface);
2235
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2237
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2240
perror_plus("socket");
2246
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2250
/* Raise privileges */
2251
ret_errno = raise_privileges();
2254
perror_plus("Failed to raise privileges");
2257
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2258
ioctl_errno = errno;
2260
/* If raise_privileges() succeeded above */
2262
/* Lower privileges */
2263
ret_errno = lower_privileges();
2266
perror_plus("Failed to lower privileges");
2270
/* Close the socket */
2271
int ret = close(sd);
2273
perror_plus("close");
2276
if(ret_setflags == -1){
2277
errno = ioctl_errno;
2278
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2283
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
2291
1124
int main(int argc, char *argv[]){
2292
mandos_context mc = { .server = NULL, .dh_bits = 0,
2293
.priority = "SECURE256:!CTYPE-X.509"
2294
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2295
.current_server = NULL, .interfaces = NULL,
2296
.interfaces_size = 0 };
2297
1125
AvahiSServiceBrowser *sb = NULL;
2300
1128
intmax_t tmpmax;
2302
1130
int exitcode = EXIT_SUCCESS;
2303
char *interfaces_to_take_down = NULL;
2304
size_t interfaces_to_take_down_size = 0;
2305
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2306
char old_tempdir[] = "/tmp/mandosXXXXXX";
2307
char *tempdir = NULL;
1131
const char *interface = "";
1132
struct ifreq network;
1134
bool take_down_interface = false;
1137
char tempdir[] = "/tmp/mandosXXXXXX";
1138
bool tempdir_created = false;
2308
1139
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2309
1140
const char *seckey = PATHDIR "/" SECKEY;
2310
1141
const char *pubkey = PATHDIR "/" PUBKEY;
2311
const char *dh_params_file = NULL;
2312
char *interfaces_hooks = NULL;
2314
1143
bool gnutls_initialized = false;
2315
1144
bool gpgme_initialized = false;
2316
1145
float delay = 2.5f;
2317
double retry_interval = 10; /* 10s between trying a server and
2318
retrying the same server again */
2320
1147
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2321
1148
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2501
/* Work around Debian bug #633582:
2502
<https://bugs.debian.org/633582> */
2504
/* Re-raise privileges */
2505
ret = raise_privileges();
2508
perror_plus("Failed to raise privileges");
2512
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2513
int seckey_fd = open(seckey, O_RDONLY);
2514
if(seckey_fd == -1){
2515
perror_plus("open");
2517
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2519
perror_plus("fstat");
2521
if(S_ISREG(st.st_mode)
2522
and st.st_uid == 0 and st.st_gid == 0){
2523
ret = fchown(seckey_fd, uid, gid);
2525
perror_plus("fchown");
2533
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2534
int pubkey_fd = open(pubkey, O_RDONLY);
2535
if(pubkey_fd == -1){
2536
perror_plus("open");
2538
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2540
perror_plus("fstat");
2542
if(S_ISREG(st.st_mode)
2543
and st.st_uid == 0 and st.st_gid == 0){
2544
ret = fchown(pubkey_fd, uid, gid);
2546
perror_plus("fchown");
2554
if(dh_params_file != NULL
2555
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2556
int dhparams_fd = open(dh_params_file, O_RDONLY);
2557
if(dhparams_fd == -1){
2558
perror_plus("open");
2560
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2562
perror_plus("fstat");
2564
if(S_ISREG(st.st_mode)
2565
and st.st_uid == 0 and st.st_gid == 0){
2566
ret = fchown(dhparams_fd, uid, gid);
2568
perror_plus("fchown");
2576
/* Lower privileges */
2577
ret = lower_privileges();
2580
perror_plus("Failed to lower privileges");
2585
/* Remove invalid interface names (except "none") */
2587
char *interface = NULL;
2588
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2590
if(strcmp(interface, "none") != 0
2591
and if_nametoindex(interface) == 0){
2592
if(interface[0] != '\0'){
2593
fprintf_plus(stderr, "Not using nonexisting interface"
2594
" \"%s\"\n", interface);
2596
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2602
/* Run network hooks */
2604
if(mc.interfaces != NULL){
2605
interfaces_hooks = malloc(mc.interfaces_size);
2606
if(interfaces_hooks == NULL){
2607
perror_plus("malloc");
2610
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2611
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2613
run_network_hooks("start", interfaces_hooks != NULL ?
2614
interfaces_hooks : "", delay);
2618
1297
avahi_set_log_function(empty_log);
1300
if(interface[0] == '\0'){
1301
struct dirent **direntries;
1302
ret = scandir(sys_class_net, &direntries, good_interface,
1305
/* Pick the first good interface */
1306
interface = strdup(direntries[0]->d_name);
1308
fprintf(stderr, "Using interface \"%s\"\n", interface);
1310
if(interface == NULL){
1313
exitcode = EXIT_FAILURE;
1319
fprintf(stderr, "Could not find a network interface\n");
1320
exitcode = EXIT_FAILURE;
2621
1325
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2622
1326
from the signal handler */
2623
1327
/* Initialize the pseudo-RNG for Avahi */
2624
1328
srand((unsigned int) time(NULL));
2625
simple_poll = avahi_simple_poll_new();
2626
if(simple_poll == NULL){
2627
fprintf_plus(stderr,
2628
"Avahi: Failed to create simple poll object.\n");
1329
mc.simple_poll = avahi_simple_poll_new();
1330
if(mc.simple_poll == NULL){
1331
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
2629
1332
exitcode = EX_UNAVAILABLE;
2656
1359
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2658
perror_plus("sigaction");
1361
perror("sigaction");
2659
1362
return EX_OSERR;
2661
1364
if(old_sigterm_action.sa_handler != SIG_IGN){
2662
1365
ret = sigaction(SIGINT, &sigterm_action, NULL);
2664
perror_plus("sigaction");
1367
perror("sigaction");
2665
1368
exitcode = EX_OSERR;
2669
1372
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2671
perror_plus("sigaction");
1374
perror("sigaction");
2672
1375
return EX_OSERR;
2674
1377
if(old_sigterm_action.sa_handler != SIG_IGN){
2675
1378
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2677
perror_plus("sigaction");
1380
perror("sigaction");
2678
1381
exitcode = EX_OSERR;
2682
1385
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2684
perror_plus("sigaction");
1387
perror("sigaction");
2685
1388
return EX_OSERR;
2687
1390
if(old_sigterm_action.sa_handler != SIG_IGN){
2688
1391
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2690
perror_plus("sigaction");
1393
perror("sigaction");
2691
1394
exitcode = EX_OSERR;
2696
/* If no interfaces were specified, make a list */
2697
if(mc.interfaces == NULL){
2698
struct dirent **direntries = NULL;
2699
/* Look for any good interfaces */
2700
ret = scandir(sys_class_net, &direntries, good_interface,
2703
/* Add all found interfaces to interfaces list */
2704
for(int i = 0; i < ret; ++i){
2705
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2706
direntries[i]->d_name);
2709
perror_plus("argz_add");
2710
free(direntries[i]);
2714
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2715
direntries[i]->d_name);
2717
free(direntries[i]);
1399
/* If the interface is down, bring it up */
1400
if(strcmp(interface, "none") != 0){
1401
if_index = (AvahiIfIndex) if_nametoindex(interface);
1403
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1404
exitcode = EX_UNAVAILABLE;
1412
/* Re-raise priviliges */
1420
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1421
messages about the network interface to mess up the prompt */
1422
ret = klogctl(8, NULL, 5);
1423
bool restore_loglevel = true;
1425
restore_loglevel = false;
1428
#endif /* __linux__ */
1430
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1433
exitcode = EX_OSERR;
1435
if(restore_loglevel){
1436
ret = klogctl(7, NULL, 0);
1441
#endif /* __linux__ */
1442
/* Lower privileges */
1450
strcpy(network.ifr_name, interface);
1451
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1453
perror("ioctl SIOCGIFFLAGS");
1455
if(restore_loglevel){
1456
ret = klogctl(7, NULL, 0);
1461
#endif /* __linux__ */
1462
exitcode = EX_OSERR;
1463
/* Lower privileges */
1471
if((network.ifr_flags & IFF_UP) == 0){
1472
network.ifr_flags |= IFF_UP;
1473
take_down_interface = true;
1474
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1476
take_down_interface = false;
1477
perror("ioctl SIOCSIFFLAGS +IFF_UP");
1478
exitcode = EX_OSERR;
1480
if(restore_loglevel){
1481
ret = klogctl(7, NULL, 0);
1486
#endif /* __linux__ */
1487
/* Lower privileges */
1496
/* sleep checking until interface is running */
1497
for(int i=0; i < delay * 4; i++){
1498
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1500
perror("ioctl SIOCGIFFLAGS");
1501
} else if(network.ifr_flags & IFF_RUNNING){
1504
struct timespec sleeptime = { .tv_nsec = 250000000 };
1505
ret = nanosleep(&sleeptime, NULL);
1506
if(ret == -1 and errno != EINTR){
1507
perror("nanosleep");
1510
if(not take_down_interface){
1511
/* We won't need the socket anymore */
1512
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1518
if(restore_loglevel){
1519
/* Restores kernel loglevel to default */
1520
ret = klogctl(7, NULL, 0);
1525
#endif /* __linux__ */
1526
/* Lower privileges */
1528
if(take_down_interface){
1529
/* Lower privileges */
2724
fprintf_plus(stderr, "Could not find a network interface\n");
2725
exitcode = EXIT_FAILURE;
2730
/* Bring up interfaces which are down, and remove any "none"s */
2732
char *interface = NULL;
2733
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2735
/* If interface name is "none", stop bringing up interfaces.
2736
Also remove all instances of "none" from the list */
2737
if(strcmp(interface, "none") == 0){
2738
argz_delete(&mc.interfaces, &mc.interfaces_size,
2741
while((interface = argz_next(mc.interfaces,
2742
mc.interfaces_size, interface))){
2743
if(strcmp(interface, "none") == 0){
2744
argz_delete(&mc.interfaces, &mc.interfaces_size,
2751
bool interface_was_up = interface_is_up(interface);
2752
errno = bring_up_interface(interface, delay);
2753
if(not interface_was_up){
2755
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2756
" %s\n", interface, strerror(errno));
2758
errno = argz_add(&interfaces_to_take_down,
2759
&interfaces_to_take_down_size,
2762
perror_plus("argz_add");
2767
if(debug and (interfaces_to_take_down == NULL)){
2768
fprintf_plus(stderr, "No interfaces were brought up\n");
2772
/* If we only got one interface, explicitly use only that one */
2773
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2775
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2778
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
1535
/* Lower privileges permanently */
2785
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
1547
ret = init_gnutls_global(pubkey, seckey);
2787
fprintf_plus(stderr, "init_gnutls_global failed\n");
1549
fprintf(stderr, "init_gnutls_global failed\n");
2788
1550
exitcode = EX_UNAVAILABLE;
2990
1721
gpgme_release(mc.ctx);
2993
/* Cleans up the circular linked list of Mandos servers the client
2995
if(mc.current_server != NULL){
2996
mc.current_server->prev->next = NULL;
2997
while(mc.current_server != NULL){
2998
server *next = mc.current_server->next;
3000
#pragma GCC diagnostic push
3001
#pragma GCC diagnostic ignored "-Wcast-qual"
3003
free((char *)(mc.current_server->ip));
3005
#pragma GCC diagnostic pop
3007
free(mc.current_server);
3008
mc.current_server = next;
3012
/* Re-raise privileges */
3014
ret = raise_privileges();
3017
perror_plus("Failed to raise privileges");
3020
/* Run network hooks */
3021
run_network_hooks("stop", interfaces_hooks != NULL ?
3022
interfaces_hooks : "", delay);
3024
/* Take down the network interfaces which were brought up */
3026
char *interface = NULL;
3027
while((interface = argz_next(interfaces_to_take_down,
3028
interfaces_to_take_down_size,
3030
ret = take_down_interface(interface);
3033
perror_plus("Failed to take down interface");
3036
if(debug and (interfaces_to_take_down == NULL)){
3037
fprintf_plus(stderr, "No interfaces needed to be taken"
3043
ret = lower_privileges_permanently();
3046
perror_plus("Failed to lower privileges permanently");
3050
free(interfaces_to_take_down);
3051
free(interfaces_hooks);
3053
void clean_dir_at(int base, const char * const dirname,
3055
struct dirent **direntries = NULL;
3057
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3063
perror_plus("open");
3065
int numentries = scandirat(dir_fd, ".", &direntries,
3066
notdotentries, alphasort);
3067
if(numentries >= 0){
3068
for(int i = 0; i < numentries; i++){
3070
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3071
dirname, direntries[i]->d_name);
3073
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3075
if(errno == EISDIR){
3076
dret = unlinkat(dir_fd, direntries[i]->d_name,
3079
if((dret == -1) and (errno == ENOTEMPTY)
3080
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3081
== 0) and (level == 0)){
3082
/* Recurse only in this special case */
3083
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3087
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3088
direntries[i]->d_name, strerror(errno));
3091
free(direntries[i]);
3094
/* need to clean even if 0 because man page doesn't specify */
3096
if(numentries == -1){
3097
perror_plus("scandirat");
3099
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3100
if(dret == -1 and errno != ENOENT){
3101
perror_plus("rmdir");
3104
perror_plus("scandirat");
3109
/* Removes the GPGME temp directory and all files inside */
3110
if(tempdir != NULL){
3111
clean_dir_at(-1, tempdir, 0);
1724
/* Take down the network interface */
1725
if(take_down_interface){
1726
/* Re-raise priviliges */
1733
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1735
perror("ioctl SIOCGIFFLAGS");
1736
} else if(network.ifr_flags & IFF_UP) {
1737
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1738
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1740
perror("ioctl SIOCSIFFLAGS -IFF_UP");
1743
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1747
/* Lower privileges permanently */
1756
/* Removes the temp directory used by GPGME */
1757
if(tempdir_created){
1759
struct dirent *direntry;
1760
d = opendir(tempdir);
1762
if(errno != ENOENT){
1767
direntry = readdir(d);
1768
if(direntry == NULL){
1771
/* Skip "." and ".." */
1772
if(direntry->d_name[0] == '.'
1773
and (direntry->d_name[1] == '\0'
1774
or (direntry->d_name[1] == '.'
1775
and direntry->d_name[2] == '\0'))){
1778
char *fullname = NULL;
1779
ret = asprintf(&fullname, "%s/%s", tempdir,
1785
ret = remove(fullname);
1787
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1794
ret = rmdir(tempdir);
1795
if(ret == -1 and errno != ENOENT){