117
51
#include <avahi-common/malloc.h>
118
52
#include <avahi-common/error.h>
121
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
124
init_gnutls_session(),
126
#if GNUTLS_VERSION_NUMBER < 0x030600
127
#include <gnutls/openpgp.h>
128
/* gnutls_certificate_set_openpgp_key_file(),
129
GNUTLS_OPENPGP_FMT_BASE64 */
130
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
#include <gnutls/x509.h> /* gnutls_pkcs_encrypt_flags_t,
133
GNUTLS_PKCS_NULL_PASSWORD */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
137
#include <gpgme.h> /* All GPGME types, constants and
140
GPGME_PROTOCOL_OpenPGP,
72
#include <errno.h> /* perror() */
143
75
#define BUFFER_SIZE 256
145
#define PATHDIR "/conf/conf.d/mandos"
146
#define SECKEY "seckey.txt"
147
#define PUBKEY "pubkey.txt"
148
#define TLS_PRIVKEY "tls-privkey.pem"
149
#define TLS_PUBKEY "tls-pubkey.pem"
150
#define HOOKDIR "/lib/mandos/network-hooks.d"
152
77
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
153
79
static const char mandos_protocol_version[] = "1";
154
const char *argp_program_version = "mandos-client " VERSION;
155
const char *argp_program_bug_address = "<mandos@recompile.se>";
156
static const char sys_class_net[] = "/sys/class/net";
157
char *connect_to = NULL;
158
const char *hookdir = HOOKDIR;
163
/* Doubly linked list that need to be circularly linked when used */
164
typedef struct server{
167
AvahiIfIndex if_index;
169
struct timespec last_seen;
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
174
83
/* Used for passing in values through the Avahi callback functions */
85
AvahiSimplePoll *simple_poll;
176
86
AvahiServer *server;
177
87
gnutls_certificate_credentials_t cred;
178
88
unsigned int dh_bits;
179
89
gnutls_dh_params_t dh_params;
180
90
const char *priority;
182
server *current_server;
184
size_t interfaces_size;
187
/* global so signal handler can reach it*/
188
AvahiSimplePoll *simple_poll;
190
sig_atomic_t quit_now = 0;
191
int signal_received = 0;
193
/* Function to use when printing errors */
194
void perror_plus(const char *print_text){
196
fprintf(stderr, "Mandos plugin %s: ",
197
program_invocation_short_name);
202
__attribute__((format (gnu_printf, 2, 3), nonnull))
203
int fprintf_plus(FILE *stream, const char *format, ...){
205
va_start (ap, format);
207
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
208
program_invocation_short_name));
209
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
213
* Make additional room in "buffer" for at least BUFFER_SIZE more
214
* bytes. "buffer_capacity" is how much is currently allocated,
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
215
96
* "buffer_length" is how much is already used.
217
__attribute__((nonnull, warn_unused_result))
218
size_t incbuffer(char **buffer, size_t buffer_length,
219
size_t buffer_capacity){
220
if(buffer_length + BUFFER_SIZE > buffer_capacity){
221
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
223
int old_errno = errno;
98
size_t adjustbuffer(char **buffer, size_t buffer_length,
99
size_t buffer_capacity){
100
if (buffer_length + BUFFER_SIZE > buffer_capacity){
101
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
230
105
buffer_capacity += BUFFER_SIZE;
232
107
return buffer_capacity;
235
/* Add server to set of servers to retry periodically */
236
__attribute__((nonnull, warn_unused_result))
237
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
238
int af, server **current_server){
240
server *new_server = malloc(sizeof(server));
241
if(new_server == NULL){
242
perror_plus("malloc");
245
*new_server = (server){ .ip = strdup(ip),
247
.if_index = if_index,
249
if(new_server->ip == NULL){
250
perror_plus("strdup");
254
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
256
perror_plus("clock_gettime");
258
#pragma GCC diagnostic push
259
#pragma GCC diagnostic ignored "-Wcast-qual"
261
free((char *)(new_server->ip));
263
#pragma GCC diagnostic pop
268
/* Special case of first server */
269
if(*current_server == NULL){
270
new_server->next = new_server;
271
new_server->prev = new_server;
272
*current_server = new_server;
274
/* Place the new server last in the list */
275
new_server->next = *current_server;
276
new_server->prev = (*current_server)->prev;
277
new_server->prev->next = new_server;
278
(*current_server)->prev = new_server;
283
/* Set effective uid to 0, return errno */
284
__attribute__((warn_unused_result))
285
int raise_privileges(void){
286
int old_errno = errno;
288
if(seteuid(0) == -1){
295
/* Set effective and real user ID to 0. Return errno. */
296
__attribute__((warn_unused_result))
297
int raise_privileges_permanently(void){
298
int old_errno = errno;
299
int ret = raise_privileges();
311
/* Set effective user ID to unprivileged saved user ID */
312
__attribute__((warn_unused_result))
313
int lower_privileges(void){
314
int old_errno = errno;
316
if(seteuid(uid) == -1){
323
/* Lower privileges permanently */
324
__attribute__((warn_unused_result))
325
int lower_privileges_permanently(void){
326
int old_errno = errno;
328
if(setuid(uid) == -1){
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
338
__attribute__((nonnull, warn_unused_result))
339
static bool init_gpgme(const char * const seckey,
340
const char * const pubkey,
341
const char * const tempdir,
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
343
120
gpgme_error_t rc;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
344
124
gpgme_engine_info_t engine_info;
347
* Helper function to insert pub and seckey to the engine keyring.
349
bool import_key(const char * const filename){
352
gpgme_data_t pgp_data;
354
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
360
/* Workaround for systems without a real-time clock; see also
361
Debian bug #894495: <https://bugs.debian.org/894495> */
364
time_t currtime = time(NULL);
365
if(currtime != (time_t)-1){
367
if(gmtime_r(&currtime, &tm) == NULL) {
368
perror_plus("gmtime_r");
371
if(tm.tm_year != 70 or tm.tm_mon != 0){
375
fprintf_plus(stderr, "System clock is January 1970");
379
fprintf_plus(stderr, "System clock is invalid");
384
ret = fstat(fd, &keystat);
386
perror_plus("fstat");
389
ret = raise_privileges();
392
perror_plus("Failed to raise privileges");
397
"Setting system clock to key file mtime");
399
time_t keytime = keystat.st_mtim.tv_sec;
400
if(stime(&keytime) != 0){
401
perror_plus("stime");
403
ret = lower_privileges();
406
perror_plus("Failed to lower privileges");
410
rc = gpgme_data_new_from_fd(&pgp_data, fd);
411
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
417
rc = gpgme_op_import(mc->ctx, pgp_data);
418
if(rc != GPG_ERR_NO_ERROR){
419
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
420
gpgme_strsource(rc), gpgme_strerror(rc));
424
gpgme_import_result_t import_result
425
= gpgme_op_import_result(mc->ctx);
426
if((import_result->imported < 1
427
or import_result->not_imported > 0)
428
and import_result->unchanged == 0){
429
fprintf_plus(stderr, "bad gpgme_op_import_results:\n");
431
"The total number of considered keys: %d\n",
432
import_result->considered);
434
"The number of keys without user ID: %d\n",
435
import_result->no_user_id);
437
"The total number of imported keys: %d\n",
438
import_result->imported);
439
fprintf_plus(stderr, "The number of imported RSA keys: %d\n",
440
import_result->imported_rsa);
441
fprintf_plus(stderr, "The number of unchanged keys: %d\n",
442
import_result->unchanged);
443
fprintf_plus(stderr, "The number of new user IDs: %d\n",
444
import_result->new_user_ids);
445
fprintf_plus(stderr, "The number of new sub keys: %d\n",
446
import_result->new_sub_keys);
447
fprintf_plus(stderr, "The number of new signatures: %d\n",
448
import_result->new_signatures);
449
fprintf_plus(stderr, "The number of new revocations: %d\n",
450
import_result->new_revocations);
452
"The total number of secret keys read: %d\n",
453
import_result->secret_read);
455
"The number of imported secret keys: %d\n",
456
import_result->secret_imported);
458
"The number of unchanged secret keys: %d\n",
459
import_result->secret_unchanged);
460
fprintf_plus(stderr, "The number of keys not imported: %d\n",
461
import_result->not_imported);
462
for(gpgme_import_status_t import_status
463
= import_result->imports;
464
import_status != NULL;
465
import_status = import_status->next){
466
fprintf_plus(stderr, "Import status for key: %s\n",
468
if(import_status->result != GPG_ERR_NO_ERROR){
469
fprintf_plus(stderr, "Import result: %s: %s\n",
470
gpgme_strsource(import_status->result),
471
gpgme_strerror(import_status->result));
473
fprintf_plus(stderr, "Key status:\n");
475
import_status->status & GPGME_IMPORT_NEW
476
? "The key was new.\n"
477
: "The key was not new.\n");
479
import_status->status & GPGME_IMPORT_UID
480
? "The key contained new user IDs.\n"
481
: "The key did not contain new user IDs.\n");
483
import_status->status & GPGME_IMPORT_SIG
484
? "The key contained new signatures.\n"
485
: "The key did not contain new signatures.\n");
487
import_status->status & GPGME_IMPORT_SUBKEY
488
? "The key contained new sub keys.\n"
489
: "The key did not contain new sub keys.\n");
491
import_status->status & GPGME_IMPORT_SECRET
492
? "The key contained a secret key.\n"
493
: "The key did not contain a secret key.\n");
501
perror_plus("close");
503
gpgme_data_release(pgp_data);
508
fprintf_plus(stderr, "Initializing GPGME\n");
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
512
131
gpgme_check_version(NULL);
513
132
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
514
if(rc != GPG_ERR_NO_ERROR){
515
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
516
gpgme_strsource(rc), gpgme_strerror(rc));
133
if (rc != GPG_ERR_NO_ERROR){
134
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
135
gpgme_strsource(rc), gpgme_strerror(rc));
520
139
/* Set GPGME home directory for the OpenPGP engine only */
521
rc = gpgme_get_engine_info(&engine_info);
522
if(rc != GPG_ERR_NO_ERROR){
523
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
524
gpgme_strsource(rc), gpgme_strerror(rc));
140
rc = gpgme_get_engine_info (&engine_info);
141
if (rc != GPG_ERR_NO_ERROR){
142
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
143
gpgme_strsource(rc), gpgme_strerror(rc));
527
146
while(engine_info != NULL){
528
147
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
529
148
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
530
engine_info->file_name, tempdir);
149
engine_info->file_name, homedir);
533
152
engine_info = engine_info->next;
535
154
if(engine_info == NULL){
536
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
541
/* Create new GPGME "context" */
542
rc = gpgme_new(&(mc->ctx));
543
if(rc != GPG_ERR_NO_ERROR){
544
fprintf_plus(stderr, "bad gpgme_new: %s: %s\n",
545
gpgme_strsource(rc), gpgme_strerror(rc));
549
if(not import_key(pubkey) or not import_key(seckey)){
557
* Decrypt OpenPGP data.
558
* Returns -1 on error
560
__attribute__((nonnull, warn_unused_result))
561
static ssize_t pgp_packet_decrypt(const char *cryptotext,
565
gpgme_data_t dh_crypto, dh_plain;
568
size_t plaintext_capacity = 0;
569
ssize_t plaintext_length = 0;
572
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
575
159
/* Create new GPGME data buffer from memory cryptotext */
576
160
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
578
if(rc != GPG_ERR_NO_ERROR){
579
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
580
gpgme_strsource(rc), gpgme_strerror(rc));
162
if (rc != GPG_ERR_NO_ERROR){
163
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
164
gpgme_strsource(rc), gpgme_strerror(rc));
584
168
/* Create new empty GPGME data buffer for the plaintext */
585
169
rc = gpgme_data_new(&dh_plain);
586
if(rc != GPG_ERR_NO_ERROR){
587
fprintf_plus(stderr, "bad gpgme_data_new: %s: %s\n",
588
gpgme_strsource(rc), gpgme_strerror(rc));
170
if (rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
589
173
gpgme_data_release(dh_crypto);
177
/* Create new GPGME "context" */
178
rc = gpgme_new(&ctx);
179
if (rc != GPG_ERR_NO_ERROR){
180
fprintf(stderr, "bad gpgme_new: %s: %s\n",
181
gpgme_strsource(rc), gpgme_strerror(rc));
182
plaintext_length = -1;
593
186
/* Decrypt data from the cryptotext data buffer to the plaintext
595
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
596
if(rc != GPG_ERR_NO_ERROR){
597
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
598
gpgme_strsource(rc), gpgme_strerror(rc));
188
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
599
192
plaintext_length = -1;
601
gpgme_decrypt_result_t result;
602
result = gpgme_op_decrypt_result(mc->ctx);
604
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
606
if(result->unsupported_algorithm != NULL) {
607
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
608
result->unsupported_algorithm);
610
fprintf_plus(stderr, "Wrong key usage: %s\n",
611
result->wrong_key_usage ? "Yes" : "No");
612
if(result->file_name != NULL){
613
fprintf_plus(stderr, "File name: %s\n", result->file_name);
616
for(gpgme_recipient_t r = result->recipients; r != NULL;
618
fprintf_plus(stderr, "Public key algorithm: %s\n",
619
gpgme_pubkey_algo_name(r->pubkey_algo));
620
fprintf_plus(stderr, "Key ID: %s\n", r->keyid);
621
fprintf_plus(stderr, "Secret key available: %s\n",
622
r->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
626
193
goto decrypt_end;
630
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
197
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
201
gpgme_decrypt_result_t result;
202
result = gpgme_op_decrypt_result(ctx);
204
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
206
fprintf(stderr, "Unsupported algorithm: %s\n",
207
result->unsupported_algorithm);
208
fprintf(stderr, "Wrong key usage: %d\n",
209
result->wrong_key_usage);
210
if(result->file_name != NULL){
211
fprintf(stderr, "File name: %s\n", result->file_name);
213
gpgme_recipient_t recipient;
214
recipient = result->recipients;
216
while(recipient != NULL){
217
fprintf(stderr, "Public key algorithm: %s\n",
218
gpgme_pubkey_algo_name(recipient->pubkey_algo));
219
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
220
fprintf(stderr, "Secret key available: %s\n",
221
recipient->status == GPG_ERR_NO_SECKEY
223
recipient = recipient->next;
633
229
/* Seek back to the beginning of the GPGME plaintext data buffer */
634
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
635
perror_plus("gpgme_data_seek");
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
636
232
plaintext_length = -1;
637
233
goto decrypt_end;
640
236
*plaintext = NULL;
642
plaintext_capacity = incbuffer(plaintext,
643
(size_t)plaintext_length,
645
if(plaintext_capacity == 0){
646
perror_plus("incbuffer");
647
plaintext_length = -1;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
651
247
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
653
249
/* Print the data, if any */
659
perror_plus("gpgme_data_read");
255
perror("gpgme_data_read");
660
256
plaintext_length = -1;
661
257
goto decrypt_end;
663
259
plaintext_length += ret;
667
fprintf_plus(stderr, "Decrypted password is: ");
263
fprintf(stderr, "Decrypted password is: ");
668
264
for(ssize_t i = 0; i < plaintext_length; i++){
669
265
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
723
317
/* OpenPGP credentials */
724
ret = gnutls_certificate_allocate_credentials(&mc->cred);
725
if(ret != GNUTLS_E_SUCCESS){
726
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
727
safer_gnutls_strerror(ret));
318
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
319
!= GNUTLS_E_SUCCESS) {
320
fprintf (stderr, "GnuTLS memory error: %s\n",
321
safer_gnutls_strerror(ret));
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
326
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
327
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
738
#if GNUTLS_VERSION_NUMBER >= 0x030606
739
ret = gnutls_certificate_set_rawpk_key_file
740
(mc->cred, pubkeyfilename, seckeyfilename,
741
GNUTLS_X509_FMT_PEM, /* format */
744
GNUTLS_KEY_DIGITAL_SIGNATURE | GNUTLS_KEY_KEY_ENCIPHERMENT,
746
0, /* names_length */
748
GNUTLS_PKCS_PLAIN | GNUTLS_PKCS_NULL_PASSWORD,
749
0); /* pkcs11_flags */
750
#elif GNUTLS_VERSION_NUMBER < 0x030600
751
331
ret = gnutls_certificate_set_openpgp_key_file
752
(mc->cred, pubkeyfilename, seckeyfilename,
753
GNUTLS_OPENPGP_FMT_BASE64);
755
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
757
if(ret != GNUTLS_E_SUCCESS){
759
"Error[%d] while reading the key pair ('%s',"
760
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
761
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
762
safer_gnutls_strerror(ret));
332
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
333
if (ret != GNUTLS_E_SUCCESS) {
335
"Error[%d] while reading the OpenPGP key pair ('%s',"
336
" '%s')\n", ret, pubkeyfile, seckeyfile);
337
fprintf(stdout, "The GnuTLS error is: %s\n",
338
safer_gnutls_strerror(ret));
766
342
/* GnuTLS server initialization */
767
343
ret = gnutls_dh_params_init(&mc->dh_params);
768
if(ret != GNUTLS_E_SUCCESS){
769
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
770
" initialization: %s\n",
771
safer_gnutls_strerror(ret));
774
/* If a Diffie-Hellman parameters file was given, try to use it */
775
if(dhparamsfilename != NULL){
776
gnutls_datum_t params = { .data = NULL, .size = 0 };
778
int dhpfile = open(dhparamsfilename, O_RDONLY);
781
dhparamsfilename = NULL;
784
size_t params_capacity = 0;
786
params_capacity = incbuffer((char **)¶ms.data,
788
(size_t)params_capacity);
789
if(params_capacity == 0){
790
perror_plus("incbuffer");
793
dhparamsfilename = NULL;
796
ssize_t bytes_read = read(dhpfile,
797
params.data + params.size,
803
/* check bytes_read for failure */
808
dhparamsfilename = NULL;
811
params.size += (unsigned int)bytes_read;
813
ret = close(dhpfile);
815
perror_plus("close");
817
if(params.data == NULL){
818
dhparamsfilename = NULL;
820
if(dhparamsfilename == NULL){
823
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
824
GNUTLS_X509_FMT_PEM);
825
if(ret != GNUTLS_E_SUCCESS){
826
fprintf_plus(stderr, "Failed to parse DH parameters in file"
827
" \"%s\": %s\n", dhparamsfilename,
828
safer_gnutls_strerror(ret));
829
dhparamsfilename = NULL;
834
if(dhparamsfilename == NULL){
835
if(mc->dh_bits == 0){
836
#if GNUTLS_VERSION_NUMBER < 0x030600
837
/* Find out the optimal number of DH bits */
838
/* Try to read the private key file */
839
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
841
int secfile = open(seckeyfilename, O_RDONLY);
846
size_t buffer_capacity = 0;
848
buffer_capacity = incbuffer((char **)&buffer.data,
850
(size_t)buffer_capacity);
851
if(buffer_capacity == 0){
852
perror_plus("incbuffer");
857
ssize_t bytes_read = read(secfile,
858
buffer.data + buffer.size,
864
/* check bytes_read for failure */
871
buffer.size += (unsigned int)bytes_read;
875
/* If successful, use buffer to parse private key */
876
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
877
if(buffer.data != NULL){
879
gnutls_openpgp_privkey_t privkey = NULL;
880
ret = gnutls_openpgp_privkey_init(&privkey);
881
if(ret != GNUTLS_E_SUCCESS){
882
fprintf_plus(stderr, "Error initializing OpenPGP key"
884
safer_gnutls_strerror(ret));
888
ret = gnutls_openpgp_privkey_import
889
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
890
if(ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
892
safer_gnutls_strerror(ret));
898
/* Use private key to suggest an appropriate
900
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
901
gnutls_openpgp_privkey_deinit(privkey);
903
fprintf_plus(stderr, "This OpenPGP key implies using"
904
" a GnuTLS security parameter \"%s\".\n",
905
safe_string(gnutls_sec_param_get_name
911
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
912
/* Err on the side of caution */
913
sec_param = GNUTLS_SEC_PARAM_ULTRA;
915
fprintf_plus(stderr, "Falling back to security parameter"
917
safe_string(gnutls_sec_param_get_name
922
unsigned int uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
926
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
927
" implies %u DH bits; using that.\n",
928
safe_string(gnutls_sec_param_get_name
933
fprintf_plus(stderr, "Failed to get implied number of DH"
934
" bits for security parameter \"%s\"): %s\n",
935
safe_string(gnutls_sec_param_get_name
937
safer_gnutls_strerror(ret));
941
} else { /* dh_bits != 0 */
943
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
946
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
947
if(ret != GNUTLS_E_SUCCESS){
948
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
949
" bits): %s\n", mc->dh_bits,
950
safer_gnutls_strerror(ret));
953
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
346
" %s\n", safer_gnutls_strerror(ret));
349
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
350
if (ret != GNUTLS_E_SUCCESS) {
351
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
352
safer_gnutls_strerror(ret));
356
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
961
gnutls_certificate_free_credentials(mc->cred);
962
gnutls_dh_params_deinit(mc->dh_params);
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
361
static int init_gnutls_session(mandos_context *mc,
362
gnutls_session_t *session){
970
364
/* GnuTLS session creation */
972
ret = gnutls_init(session, (GNUTLS_SERVER
973
#if GNUTLS_VERSION_NUMBER >= 0x030506
976
#if GNUTLS_VERSION_NUMBER >= 0x030606
977
| GNUTLS_ENABLE_RAWPK
983
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
984
if(ret != GNUTLS_E_SUCCESS){
986
"Error in GnuTLS session initialization: %s\n",
987
safer_gnutls_strerror(ret));
365
ret = gnutls_init(session, GNUTLS_SERVER);
366
if (ret != GNUTLS_E_SUCCESS){
367
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
368
safer_gnutls_strerror(ret));
993
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
995
gnutls_deinit(*session);
998
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
999
if(ret != GNUTLS_E_SUCCESS){
1000
fprintf_plus(stderr, "Syntax error at: %s\n", err);
1001
fprintf_plus(stderr, "GnuTLS error: %s\n",
1002
safer_gnutls_strerror(ret));
1003
gnutls_deinit(*session);
373
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
374
if (ret != GNUTLS_E_SUCCESS) {
375
fprintf(stderr, "Syntax error at: %s\n", err);
376
fprintf(stderr, "GnuTLS error: %s\n",
377
safer_gnutls_strerror(ret));
1009
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
1012
gnutls_deinit(*session);
1015
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
1016
if(ret != GNUTLS_E_SUCCESS){
1017
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
1018
safer_gnutls_strerror(ret));
1019
gnutls_deinit(*session);
382
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
384
if (ret != GNUTLS_E_SUCCESS) {
385
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
386
safer_gnutls_strerror(ret));
1023
390
/* ignore client certificate if any. */
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
391
gnutls_certificate_server_set_request (*session,
394
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
1030
400
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
1031
401
__attribute__((unused)) const char *txt){}
1033
/* Helper function to add_local_route() and delete_local_route() */
1034
__attribute__((nonnull, warn_unused_result))
1035
static bool add_delete_local_route(const bool add,
1036
const char *address,
1037
AvahiIfIndex if_index){
1039
char helper[] = "mandos-client-iprouteadddel";
1040
char add_arg[] = "add";
1041
char delete_arg[] = "delete";
1042
char debug_flag[] = "--debug";
1043
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
1044
if(pluginhelperdir == NULL){
1046
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
1047
" variable not set; cannot run helper\n");
1052
char interface[IF_NAMESIZE];
1053
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1054
perror_plus("if_indextoname");
1058
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1060
perror_plus("open(\"/dev/null\", O_RDONLY)");
1066
/* Raise privileges */
1067
errno = raise_privileges_permanently();
1069
perror_plus("Failed to raise privileges");
1070
/* _exit(EX_NOPERM); */
1076
perror_plus("setgid");
1079
/* Reset supplementary groups */
1081
ret = setgroups(0, NULL);
1083
perror_plus("setgroups");
1087
ret = dup2(devnull, STDIN_FILENO);
1089
perror_plus("dup2(devnull, STDIN_FILENO)");
1092
ret = close(devnull);
1094
perror_plus("close");
1097
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1099
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1102
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1107
if(helperdir_fd == -1){
1108
perror_plus("open");
1109
_exit(EX_UNAVAILABLE);
1111
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1113
if(helper_fd == -1){
1114
perror_plus("openat");
1115
close(helperdir_fd);
1116
_exit(EX_UNAVAILABLE);
1118
close(helperdir_fd);
1120
#pragma GCC diagnostic push
1121
#pragma GCC diagnostic ignored "-Wcast-qual"
1123
if(fexecve(helper_fd, (char *const [])
1124
{ helper, add ? add_arg : delete_arg, (char *)address,
1125
interface, debug ? debug_flag : NULL, NULL },
1128
#pragma GCC diagnostic pop
1130
perror_plus("fexecve");
1131
_exit(EXIT_FAILURE);
1135
perror_plus("fork");
1142
pret = waitpid(pid, &status, 0);
1143
if(pret == -1 and errno == EINTR and quit_now){
1144
int errno_raising = 0;
1145
if((errno = raise_privileges()) != 0){
1146
errno_raising = errno;
1147
perror_plus("Failed to raise privileges in order to"
1148
" kill helper program");
1150
if(kill(pid, SIGTERM) == -1){
1151
perror_plus("kill");
1153
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1154
perror_plus("Failed to lower privileges after killing"
1159
} while(pret == -1 and errno == EINTR);
1161
perror_plus("waitpid");
1164
if(WIFEXITED(status)){
1165
if(WEXITSTATUS(status) != 0){
1166
fprintf_plus(stderr, "Error: iprouteadddel exited"
1167
" with status %d\n", WEXITSTATUS(status));
1172
if(WIFSIGNALED(status)){
1173
fprintf_plus(stderr, "Error: iprouteadddel died by"
1174
" signal %d\n", WTERMSIG(status));
1177
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1181
__attribute__((nonnull, warn_unused_result))
1182
static bool add_local_route(const char *address,
1183
AvahiIfIndex if_index){
1185
fprintf_plus(stderr, "Adding route to %s\n", address);
1187
return add_delete_local_route(true, address, if_index);
1190
__attribute__((nonnull, warn_unused_result))
1191
static bool delete_local_route(const char *address,
1192
AvahiIfIndex if_index){
1194
fprintf_plus(stderr, "Removing route to %s\n", address);
1196
return add_delete_local_route(false, address, if_index);
1199
403
/* Called when a Mandos server is found */
1200
__attribute__((nonnull, warn_unused_result))
1201
static int start_mandos_communication(const char *ip, in_port_t port,
404
static int start_mandos_communication(const char *ip, uint16_t port,
1202
405
AvahiIfIndex if_index,
1203
int af, mandos_context *mc){
1204
int ret, tcp_sd = -1;
1206
struct sockaddr_storage to;
408
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1207
409
char *buffer = NULL;
1208
char *decrypted_buffer = NULL;
410
char *decrypted_buffer;
1209
411
size_t buffer_length = 0;
1210
412
size_t buffer_capacity = 0;
413
ssize_t decrypted_buffer_size;
416
char interface[IF_NAMESIZE];
1213
417
gnutls_session_t session;
1214
int pf; /* Protocol family */
1215
bool route_added = false;
1232
fprintf_plus(stderr, "Bad address family: %d\n", af);
1237
/* If the interface is specified and we have a list of interfaces */
1238
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1239
/* Check if the interface is one of the interfaces we are using */
1242
char *interface = NULL;
1243
while((interface = argz_next(mc->interfaces,
1244
mc->interfaces_size,
1246
if(if_nametoindex(interface) == (unsigned int)if_index){
1253
/* This interface does not match any in the list, so we don't
1254
connect to the server */
1256
char interface[IF_NAMESIZE];
1257
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1258
perror_plus("if_indextoname");
1260
fprintf_plus(stderr, "Skipping server on non-used interface"
1262
if_indextoname((unsigned int)if_index,
419
ret = init_gnutls_session (mc, &session);
425
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
429
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
436
if(if_indextoname((unsigned int)if_index, interface) == NULL){
437
perror("if_indextoname");
440
fprintf(stderr, "Binding to interface %s\n", interface);
1270
ret = init_gnutls_session(&session, mc);
443
memset(&to,0,sizeof(to)); /* Spurious warning */
444
to.in6.sin6_family = AF_INET6;
445
/* It would be nice to have a way to detect if we were passed an
446
IPv4 address here. Now we assume an IPv6 address. */
447
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1276
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1277
PRIuMAX "\n", ip, (uintmax_t)port);
1280
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1283
perror_plus("socket");
1294
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1295
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1296
ret = inet_pton(af, ip, &to6->sin6_addr);
1298
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1299
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1300
ret = inet_pton(af, ip, &to4->sin_addr);
1304
perror_plus("inet_pton");
1310
fprintf_plus(stderr, "Bad address: %s\n", ip);
1315
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1316
if(IN6_IS_ADDR_LINKLOCAL
1317
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1318
if(if_index == AVAHI_IF_UNSPEC){
1319
fprintf_plus(stderr, "An IPv6 link-local address is"
1320
" incomplete without a network interface\n");
1324
/* Set the network interface number as scope */
1325
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1328
((struct sockaddr_in *)&to)->sin_port = htons(port);
453
fprintf(stderr, "Bad address: %s\n", ip);
456
to.in6.sin6_port = htons(port); /* Spurious warning */
458
to.in6.sin6_scope_id = (uint32_t)if_index;
1337
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1338
char interface[IF_NAMESIZE];
1339
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1340
perror_plus("if_indextoname");
1342
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1343
"\n", ip, interface, (uintmax_t)port);
1346
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1347
ip, (uintmax_t)port);
1349
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1350
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1352
ret = getnameinfo((struct sockaddr *)&to,
1353
sizeof(struct sockaddr_in6),
1354
addrstr, sizeof(addrstr), NULL, 0,
1357
ret = getnameinfo((struct sockaddr *)&to,
1358
sizeof(struct sockaddr_in),
1359
addrstr, sizeof(addrstr), NULL, 0,
1362
if(ret == EAI_SYSTEM){
1363
perror_plus("getnameinfo");
1364
} else if(ret != 0) {
1365
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1366
} else if(strcmp(addrstr, ip) != 0){
1367
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1378
ret = connect(tcp_sd, (struct sockaddr *)&to,
1379
sizeof(struct sockaddr_in6));
1381
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1382
sizeof(struct sockaddr_in));
1385
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1386
and if_index != AVAHI_IF_UNSPEC
1387
and connect_to == NULL
1388
and not route_added and
1389
((af == AF_INET6 and not
1390
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1392
or (af == AF_INET and
1393
/* Not a a IPv4LL address */
1394
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1395
& 0xFFFF0000L) != 0xA9FE0000L))){
1396
/* Work around Avahi bug - Avahi does not announce link-local
1397
addresses if it has a global address, so local hosts with
1398
*only* a link-local address (e.g. Mandos clients) cannot
1399
connect to a Mandos server announced by Avahi on a server
1400
host with a global address. Work around this by retrying
1401
with an explicit route added with the server's address.
1403
Avahi bug reference:
1404
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1405
https://bugs.debian.org/587961
1408
fprintf_plus(stderr, "Mandos server unreachable, trying"
1412
route_added = add_local_route(ip, if_index);
1418
if(errno != ECONNREFUSED or debug){
1420
perror_plus("connect");
461
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
462
char addrstr[INET6_ADDRSTRLEN] = "";
463
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
464
sizeof(addrstr)) == NULL){
467
if(strcmp(addrstr, ip) != 0){
468
fprintf(stderr, "Canonical address form: %s\n", addrstr);
473
ret = connect(tcp_sd, &to.in, sizeof(to));
1433
479
const char *out = mandos_protocol_version;
1436
482
size_t out_size = strlen(out);
1437
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1438
out_size - written));
1441
perror_plus("write");
483
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
484
out_size - written));
1443
488
goto mandos_end;
1445
490
written += (size_t)ret;
1446
491
if(written < out_size){
1449
if(out == mandos_protocol_version){
494
if (out == mandos_protocol_version){
1464
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1472
/* This casting via intptr_t is to eliminate warning about casting
1473
an int to a pointer type. This is exactly how the GnuTLS Guile
1474
function "set-session-transport-fd!" does it. */
1475
gnutls_transport_set_ptr(session,
1476
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1484
ret = gnutls_handshake(session);
1489
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1491
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr, "Establishing TLS session with %s\n", ip);
507
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
509
ret = gnutls_handshake (session);
511
if (ret != GNUTLS_E_SUCCESS){
1493
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
513
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1497
517
goto mandos_end;
1500
520
/* Read OpenPGP packet that contains the wanted password */
1503
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
523
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1514
buffer_capacity = incbuffer(&buffer, buffer_length,
1516
if(buffer_capacity == 0){
1518
perror_plus("incbuffer");
1528
sret = gnutls_record_recv(session, buffer+buffer_length,
528
buffer_capacity = adjustbuffer(&buffer, buffer_length,
530
if (buffer_capacity == 0){
531
perror("adjustbuffer");
536
ret = gnutls_record_recv(session, buffer+buffer_length,
1535
543
case GNUTLS_E_INTERRUPTED:
1536
544
case GNUTLS_E_AGAIN:
1538
546
case GNUTLS_E_REHANDSHAKE:
1540
ret = gnutls_handshake(session);
1546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1548
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
547
ret = gnutls_handshake (session);
549
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1552
552
goto mandos_end;
1556
fprintf_plus(stderr, "Unknown error while reading data from"
1557
" encrypted session with Mandos server\n");
1558
gnutls_bye(session, GNUTLS_SHUT_RDWR);
556
fprintf(stderr, "Unknown error while reading data from"
557
" encrypted session with Mandos server\n");
559
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1560
560
goto mandos_end;
1563
buffer_length += (size_t) sret;
563
buffer_length += (size_t) ret;
1568
fprintf_plus(stderr, "Closing TLS session\n");
1577
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1582
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1584
if(buffer_length > 0){
1585
ssize_t decrypted_buffer_size;
1586
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1587
&decrypted_buffer, mc);
1588
if(decrypted_buffer_size >= 0){
568
fprintf(stderr, "Closing TLS session\n");
571
gnutls_bye (session, GNUTLS_SHUT_RDWR);
573
if (buffer_length > 0){
574
decrypted_buffer_size = pgp_packet_decrypt(buffer,
578
if (decrypted_buffer_size >= 0){
1592
580
while(written < (size_t) decrypted_buffer_size){
1598
ret = (int)fwrite(decrypted_buffer + written, 1,
1599
(size_t)decrypted_buffer_size - written,
581
ret = (int)fwrite (decrypted_buffer + written, 1,
582
(size_t)decrypted_buffer_size - written,
1601
584
if(ret == 0 and ferror(stdout)){
1604
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
586
fprintf(stderr, "Error writing encrypted data: %s\n",
1610
592
written += (size_t)ret;
1612
ret = fflush(stdout);
1616
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
594
free(decrypted_buffer);
1626
600
/* Shutdown procedure */
1631
if(not delete_local_route(ip, if_index)){
1632
fprintf_plus(stderr, "Failed to delete local route to %s on"
1633
" interface %d", ip, if_index);
1637
free(decrypted_buffer);
1640
ret = close(tcp_sd);
1646
perror_plus("close");
1648
gnutls_deinit(session);
605
gnutls_deinit (session);
606
gnutls_certificate_free_credentials (mc->cred);
607
gnutls_global_deinit ();
1658
611
static void resolve_callback(AvahiSServiceResolver *r,
1659
612
AvahiIfIndex interface,
1660
AvahiProtocol proto,
613
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1661
614
AvahiResolverEvent event,
1662
615
const char *name,
1663
616
const char *type,
1772
698
case AVAHI_BROWSER_ALL_FOR_NOW:
1773
699
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1775
fprintf_plus(stderr, "No Mandos server found, still"
701
fprintf(stderr, "No Mandos server found, still searching...\n");
1782
/* Signal handler that stops main loop after SIGTERM */
1783
static void handle_sigterm(int sig){
1788
signal_received = sig;
1789
int old_errno = errno;
1790
/* set main loop to exit */
1791
if(simple_poll != NULL){
1792
avahi_simple_poll_quit(simple_poll);
1797
__attribute__((nonnull, warn_unused_result))
1798
bool get_flags(const char *ifname, struct ifreq *ifr){
1802
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1805
perror_plus("socket");
1809
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1810
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1811
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1815
perror_plus("ioctl SIOCGIFFLAGS");
1818
if((close(s) == -1) and debug){
1820
perror_plus("close");
1825
if((close(s) == -1) and debug){
1827
perror_plus("close");
1833
__attribute__((nonnull, warn_unused_result))
1834
bool good_flags(const char *ifname, const struct ifreq *ifr){
1836
/* Reject the loopback device */
1837
if(ifr->ifr_flags & IFF_LOOPBACK){
1839
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1844
/* Accept point-to-point devices only if connect_to is specified */
1845
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1847
fprintf_plus(stderr, "Accepting point-to-point interface"
1848
" \"%s\"\n", ifname);
1852
/* Otherwise, reject non-broadcast-capable devices */
1853
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1855
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1856
" \"%s\"\n", ifname);
1860
/* Reject non-ARP interfaces (including dummy interfaces) */
1861
if(ifr->ifr_flags & IFF_NOARP){
1863
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1869
/* Accept this device */
1871
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1877
* This function determines if a directory entry in /sys/class/net
1878
* corresponds to an acceptable network device.
1879
* (This function is passed to scandir(3) as a filter function.)
1881
__attribute__((nonnull, warn_unused_result))
1882
int good_interface(const struct dirent *if_entry){
1883
if(if_entry->d_name[0] == '.'){
1888
if(not get_flags(if_entry->d_name, &ifr)){
1890
fprintf_plus(stderr, "Failed to get flags for interface "
1891
"\"%s\"\n", if_entry->d_name);
1896
if(not good_flags(if_entry->d_name, &ifr)){
1903
* This function determines if a network interface is up.
1905
__attribute__((nonnull, warn_unused_result))
1906
bool interface_is_up(const char *interface){
1908
if(not get_flags(interface, &ifr)){
1910
fprintf_plus(stderr, "Failed to get flags for interface "
1911
"\"%s\"\n", interface);
1916
return (bool)(ifr.ifr_flags & IFF_UP);
1920
* This function determines if a network interface is running
1922
__attribute__((nonnull, warn_unused_result))
1923
bool interface_is_running(const char *interface){
1925
if(not get_flags(interface, &ifr)){
1927
fprintf_plus(stderr, "Failed to get flags for interface "
1928
"\"%s\"\n", interface);
1933
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1936
__attribute__((nonnull, pure, warn_unused_result))
1937
int notdotentries(const struct dirent *direntry){
1938
/* Skip "." and ".." */
1939
if(direntry->d_name[0] == '.'
1940
and (direntry->d_name[1] == '\0'
1941
or (direntry->d_name[1] == '.'
1942
and direntry->d_name[2] == '\0'))){
1948
/* Is this directory entry a runnable program? */
1949
__attribute__((nonnull, warn_unused_result))
1950
int runnable_hook(const struct dirent *direntry){
1955
if((direntry->d_name)[0] == '\0'){
1960
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1961
"abcdefghijklmnopqrstuvwxyz"
1964
if((direntry->d_name)[sret] != '\0'){
1965
/* Contains non-allowed characters */
1967
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1973
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1976
perror_plus("Could not stat hook");
1980
if(not (S_ISREG(st.st_mode))){
1981
/* Not a regular file */
1983
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1988
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1989
/* Not executable */
1991
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1997
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2003
__attribute__((nonnull, warn_unused_result))
2004
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2005
mandos_context *mc){
2007
struct timespec now;
2008
struct timespec waited_time;
2009
intmax_t block_time;
2012
if(mc->current_server == NULL){
2014
fprintf_plus(stderr, "Wait until first server is found."
2017
ret = avahi_simple_poll_iterate(s, -1);
2020
fprintf_plus(stderr, "Check current_server if we should run"
2023
/* the current time */
2024
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2026
perror_plus("clock_gettime");
2029
/* Calculating in ms how long time between now and server
2030
who we visted longest time ago. Now - last seen. */
2031
waited_time.tv_sec = (now.tv_sec
2032
- mc->current_server->last_seen.tv_sec);
2033
waited_time.tv_nsec = (now.tv_nsec
2034
- mc->current_server->last_seen.tv_nsec);
2035
/* total time is 10s/10,000ms.
2036
Converting to s from ms by dividing by 1,000,
2037
and ns to ms by dividing by 1,000,000. */
2038
block_time = ((retry_interval
2039
- ((intmax_t)waited_time.tv_sec * 1000))
2040
- ((intmax_t)waited_time.tv_nsec / 1000000));
2043
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2047
if(block_time <= 0){
2048
ret = start_mandos_communication(mc->current_server->ip,
2049
mc->current_server->port,
2050
mc->current_server->if_index,
2051
mc->current_server->af, mc);
2053
avahi_simple_poll_quit(s);
2056
ret = clock_gettime(CLOCK_MONOTONIC,
2057
&mc->current_server->last_seen);
2059
perror_plus("clock_gettime");
2062
mc->current_server = mc->current_server->next;
2063
block_time = 0; /* Call avahi to find new Mandos
2064
servers, but don't block */
2067
ret = avahi_simple_poll_iterate(s, (int)block_time);
2070
if(ret > 0 or errno != EINTR){
2071
return (ret != 1) ? ret : 0;
2077
__attribute__((nonnull))
2078
void run_network_hooks(const char *mode, const char *interface,
2080
struct dirent **direntries = NULL;
2081
if(hookdir_fd == -1){
2082
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2084
if(hookdir_fd == -1){
2085
if(errno == ENOENT){
2087
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2088
" found\n", hookdir);
2091
perror_plus("open");
2096
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2098
perror_plus("open(\"/dev/null\", O_RDONLY)");
2101
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2102
runnable_hook, alphasort);
2104
perror_plus("scandir");
2108
struct dirent *direntry;
2110
for(int i = 0; i < numhooks; i++){
2111
direntry = direntries[i];
2113
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2116
pid_t hook_pid = fork();
2119
/* Raise privileges */
2120
errno = raise_privileges_permanently();
2122
perror_plus("Failed to raise privileges");
2129
perror_plus("setgid");
2132
/* Reset supplementary groups */
2134
ret = setgroups(0, NULL);
2136
perror_plus("setgroups");
2139
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2141
perror_plus("setenv");
2144
ret = setenv("DEVICE", interface, 1);
2146
perror_plus("setenv");
2149
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2151
perror_plus("setenv");
2154
ret = setenv("MODE", mode, 1);
2156
perror_plus("setenv");
2160
ret = asprintf(&delaystring, "%f", (double)delay);
2162
perror_plus("asprintf");
2165
ret = setenv("DELAY", delaystring, 1);
2168
perror_plus("setenv");
2172
if(connect_to != NULL){
2173
ret = setenv("CONNECT", connect_to, 1);
2175
perror_plus("setenv");
2179
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2183
perror_plus("openat");
2184
_exit(EXIT_FAILURE);
2186
if(close(hookdir_fd) == -1){
2187
perror_plus("close");
2188
_exit(EXIT_FAILURE);
2190
ret = dup2(devnull, STDIN_FILENO);
2192
perror_plus("dup2(devnull, STDIN_FILENO)");
2195
ret = close(devnull);
2197
perror_plus("close");
2200
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2202
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2205
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2207
perror_plus("fexecve");
2208
_exit(EXIT_FAILURE);
2212
perror_plus("fork");
2217
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2218
perror_plus("waitpid");
2222
if(WIFEXITED(status)){
2223
if(WEXITSTATUS(status) != 0){
2224
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2225
" with status %d\n", direntry->d_name,
2226
WEXITSTATUS(status));
2230
} else if(WIFSIGNALED(status)){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2232
" signal %d\n", direntry->d_name,
2237
fprintf_plus(stderr, "Warning: network hook \"%s\""
2238
" crashed\n", direntry->d_name);
2244
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2250
if(close(hookdir_fd) == -1){
2251
perror_plus("close");
2258
__attribute__((nonnull, warn_unused_result))
2259
int bring_up_interface(const char *const interface,
2261
int old_errno = errno;
2263
struct ifreq network;
2264
unsigned int if_index = if_nametoindex(interface);
2266
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2276
if(not interface_is_up(interface)){
2278
int ioctl_errno = 0;
2279
if(not get_flags(interface, &network)){
2281
fprintf_plus(stderr, "Failed to get flags for interface "
2282
"\"%s\"\n", interface);
2286
network.ifr_flags |= IFF_UP; /* set flag */
2288
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2291
perror_plus("socket");
2299
perror_plus("close");
2306
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2310
/* Raise privileges */
2311
ret_errno = raise_privileges();
2314
perror_plus("Failed to raise privileges");
2319
bool restore_loglevel = false;
2321
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2322
messages about the network interface to mess up the prompt */
2323
ret_linux = klogctl(8, NULL, 5);
2324
if(ret_linux == -1){
2325
perror_plus("klogctl");
2327
restore_loglevel = true;
2330
#endif /* __linux__ */
2331
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2332
ioctl_errno = errno;
2334
if(restore_loglevel){
2335
ret_linux = klogctl(7, NULL, 0);
2336
if(ret_linux == -1){
2337
perror_plus("klogctl");
2340
#endif /* __linux__ */
2342
/* If raise_privileges() succeeded above */
2344
/* Lower privileges */
2345
ret_errno = lower_privileges();
2348
perror_plus("Failed to lower privileges");
2352
/* Close the socket */
2355
perror_plus("close");
2358
if(ret_setflags == -1){
2359
errno = ioctl_errno;
2360
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2365
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2369
/* Sleep checking until interface is running.
2370
Check every 0.25s, up to total time of delay */
2371
for(int i = 0; i < delay * 4; i++){
2372
if(interface_is_running(interface)){
2375
struct timespec sleeptime = { .tv_nsec = 250000000 };
2376
ret = nanosleep(&sleeptime, NULL);
2377
if(ret == -1 and errno != EINTR){
2378
perror_plus("nanosleep");
2386
__attribute__((nonnull, warn_unused_result))
2387
int take_down_interface(const char *const interface){
2388
int old_errno = errno;
2389
struct ifreq network;
2390
unsigned int if_index = if_nametoindex(interface);
2392
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2396
if(interface_is_up(interface)){
2398
int ioctl_errno = 0;
2399
if(not get_flags(interface, &network) and debug){
2401
fprintf_plus(stderr, "Failed to get flags for interface "
2402
"\"%s\"\n", interface);
2406
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2408
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2411
perror_plus("socket");
2417
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2421
/* Raise privileges */
2422
ret_errno = raise_privileges();
2425
perror_plus("Failed to raise privileges");
2428
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2429
ioctl_errno = errno;
2431
/* If raise_privileges() succeeded above */
2433
/* Lower privileges */
2434
ret_errno = lower_privileges();
2437
perror_plus("Failed to lower privileges");
2441
/* Close the socket */
2442
int ret = close(sd);
2444
perror_plus("close");
2447
if(ret_setflags == -1){
2448
errno = ioctl_errno;
2449
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2454
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
707
/* Combines file name and path and returns the malloced new
708
string. some sane checks could/should be added */
709
static const char *combinepath(const char *first, const char *second){
710
size_t f_len = strlen(first);
711
size_t s_len = strlen(second);
712
char *tmp = malloc(f_len + s_len + 2);
717
memcpy(tmp, first, f_len); /* Spurious warning */
721
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
723
tmp[f_len + 1 + s_len] = '\0';
2462
728
int main(int argc, char *argv[]){
2463
mandos_context mc = { .server = NULL, .dh_bits = 0,
2464
#if GNUTLS_VERSION_NUMBER >= 0x030606
2465
.priority = "SECURE128:!CTYPE-X.509"
2466
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2468
#elif GNUTLS_VERSION_NUMBER < 0x030600
2469
.priority = "SECURE256:!CTYPE-X.509"
2470
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2472
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2474
.current_server = NULL, .interfaces = NULL,
2475
.interfaces_size = 0 };
2476
AvahiSServiceBrowser *sb = NULL;
2481
int exitcode = EXIT_SUCCESS;
2482
char *interfaces_to_take_down = NULL;
2483
size_t interfaces_to_take_down_size = 0;
2484
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2485
char old_tempdir[] = "/tmp/mandosXXXXXX";
2486
char *tempdir = NULL;
2487
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2488
const char *seckey = PATHDIR "/" SECKEY;
2489
const char *pubkey = PATHDIR "/" PUBKEY;
2490
#if GNUTLS_VERSION_NUMBER >= 0x030606
2491
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2492
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2494
const char *dh_params_file = NULL;
2495
char *interfaces_hooks = NULL;
2497
bool gnutls_initialized = false;
2498
bool gpgme_initialized = false;
2500
double retry_interval = 10; /* 10s between trying a server and
2501
retrying the same server again */
2503
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2504
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2509
/* Lower any group privileges we might have, just to be safe */
2513
perror_plus("setgid");
2516
/* Lower user privileges (temporarily) */
2520
perror_plus("seteuid");
2528
struct argp_option options[] = {
2529
{ .name = "debug", .key = 128,
2530
.doc = "Debug mode", .group = 3 },
2531
{ .name = "connect", .key = 'c',
2532
.arg = "ADDRESS:PORT",
2533
.doc = "Connect directly to a specific Mandos server",
2535
{ .name = "interface", .key = 'i',
2537
.doc = "Network interface that will be used to search for"
2540
{ .name = "seckey", .key = 's',
2542
.doc = "OpenPGP secret key file base name",
2544
{ .name = "pubkey", .key = 'p',
2546
.doc = "OpenPGP public key file base name",
2548
{ .name = "tls-privkey", .key = 't',
2550
#if GNUTLS_VERSION_NUMBER >= 0x030606
2551
.doc = "TLS private key file base name",
2553
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2556
{ .name = "tls-pubkey", .key = 'T',
2558
#if GNUTLS_VERSION_NUMBER >= 0x030606
2559
.doc = "TLS public key file base name",
2561
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2564
{ .name = "dh-bits", .key = 129,
2566
.doc = "Bit length of the prime number used in the"
2567
" Diffie-Hellman key exchange",
2569
{ .name = "dh-params", .key = 134,
2571
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2572
" for the Diffie-Hellman key exchange",
2574
{ .name = "priority", .key = 130,
2576
.doc = "GnuTLS priority string for the TLS handshake",
2578
{ .name = "delay", .key = 131,
2580
.doc = "Maximum delay to wait for interface startup",
2582
{ .name = "retry", .key = 132,
2584
.doc = "Retry interval used when denied by the Mandos server",
2586
{ .name = "network-hook-dir", .key = 133,
2588
.doc = "Directory where network hooks are located",
2591
* These reproduce what we would get without ARGP_NO_HELP
2593
{ .name = "help", .key = '?',
2594
.doc = "Give this help list", .group = -1 },
2595
{ .name = "usage", .key = -3,
2596
.doc = "Give a short usage message", .group = -1 },
2597
{ .name = "version", .key = 'V',
2598
.doc = "Print program version", .group = -1 },
2602
error_t parse_opt(int key, char *arg,
2603
struct argp_state *state){
2606
case 128: /* --debug */
2609
case 'c': /* --connect */
2612
case 'i': /* --interface */
2613
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2616
argp_error(state, "%s", strerror(ret_errno));
2619
case 's': /* --seckey */
2622
case 'p': /* --pubkey */
2625
case 't': /* --tls-privkey */
2626
#if GNUTLS_VERSION_NUMBER >= 0x030606
2630
case 'T': /* --tls-pubkey */
2631
#if GNUTLS_VERSION_NUMBER >= 0x030606
2635
case 129: /* --dh-bits */
2637
tmpmax = strtoimax(arg, &tmp, 10);
2638
if(errno != 0 or tmp == arg or *tmp != '\0'
2639
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2640
argp_error(state, "Bad number of DH bits");
2642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2644
case 134: /* --dh-params */
2645
dh_params_file = arg;
2647
case 130: /* --priority */
2650
case 131: /* --delay */
2652
delay = strtof(arg, &tmp);
2653
if(errno != 0 or tmp == arg or *tmp != '\0'){
2654
argp_error(state, "Bad delay");
2656
case 132: /* --retry */
2658
retry_interval = strtod(arg, &tmp);
2659
if(errno != 0 or tmp == arg or *tmp != '\0'
2660
or (retry_interval * 1000) > INT_MAX
2661
or retry_interval < 0){
2662
argp_error(state, "Bad retry interval");
2665
case 133: /* --network-hook-dir */
2669
* These reproduce what we would get without ARGP_NO_HELP
2671
case '?': /* --help */
2672
argp_state_help(state, state->out_stream,
2673
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2674
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2675
case -3: /* --usage */
2676
argp_state_help(state, state->out_stream,
2677
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2678
case 'V': /* --version */
2679
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2680
exit(argp_err_exit_status);
2683
return ARGP_ERR_UNKNOWN;
2688
struct argp argp = { .options = options, .parser = parse_opt,
2690
.doc = "Mandos client -- Get and decrypt"
2691
" passwords from a Mandos server" };
2692
ret_errno = argp_parse(&argp, argc, argv,
2693
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2700
perror_plus("argp_parse");
2701
exitcode = EX_OSERR;
2704
exitcode = EX_USAGE;
2710
/* Work around Debian bug #633582:
2711
<https://bugs.debian.org/633582> */
2713
/* Re-raise privileges */
2714
ret = raise_privileges();
2717
perror_plus("Failed to raise privileges");
2721
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2722
int seckey_fd = open(seckey, O_RDONLY);
2723
if(seckey_fd == -1){
2724
perror_plus("open");
2726
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2728
perror_plus("fstat");
2730
if(S_ISREG(st.st_mode)
2731
and st.st_uid == 0 and st.st_gid == 0){
2732
ret = fchown(seckey_fd, uid, gid);
2734
perror_plus("fchown");
2742
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2743
int pubkey_fd = open(pubkey, O_RDONLY);
2744
if(pubkey_fd == -1){
2745
perror_plus("open");
2747
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2749
perror_plus("fstat");
2751
if(S_ISREG(st.st_mode)
2752
and st.st_uid == 0 and st.st_gid == 0){
2753
ret = fchown(pubkey_fd, uid, gid);
2755
perror_plus("fchown");
2763
if(dh_params_file != NULL
2764
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2765
int dhparams_fd = open(dh_params_file, O_RDONLY);
2766
if(dhparams_fd == -1){
2767
perror_plus("open");
2769
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2771
perror_plus("fstat");
2773
if(S_ISREG(st.st_mode)
2774
and st.st_uid == 0 and st.st_gid == 0){
2775
ret = fchown(dhparams_fd, uid, gid);
2777
perror_plus("fchown");
2785
/* Lower privileges */
2786
ret = lower_privileges();
2789
perror_plus("Failed to lower privileges");
2794
/* Remove invalid interface names (except "none") */
2796
char *interface = NULL;
2797
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2799
if(strcmp(interface, "none") != 0
2800
and if_nametoindex(interface) == 0){
2801
if(interface[0] != '\0'){
2802
fprintf_plus(stderr, "Not using nonexisting interface"
2803
" \"%s\"\n", interface);
2805
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2811
/* Run network hooks */
2813
if(mc.interfaces != NULL){
2814
interfaces_hooks = malloc(mc.interfaces_size);
2815
if(interfaces_hooks == NULL){
2816
perror_plus("malloc");
2819
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2820
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2822
run_network_hooks("start", interfaces_hooks != NULL ?
2823
interfaces_hooks : "", delay);
2827
avahi_set_log_function(empty_log);
2830
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2831
from the signal handler */
2832
/* Initialize the pseudo-RNG for Avahi */
2833
srand((unsigned int) time(NULL));
2834
simple_poll = avahi_simple_poll_new();
2835
if(simple_poll == NULL){
2836
fprintf_plus(stderr,
2837
"Avahi: Failed to create simple poll object.\n");
2838
exitcode = EX_UNAVAILABLE;
2842
sigemptyset(&sigterm_action.sa_mask);
2843
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2845
perror_plus("sigaddset");
2846
exitcode = EX_OSERR;
2849
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2851
perror_plus("sigaddset");
2852
exitcode = EX_OSERR;
2855
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2857
perror_plus("sigaddset");
2858
exitcode = EX_OSERR;
2861
/* Need to check if the handler is SIG_IGN before handling:
2862
| [[info:libc:Initial Signal Actions]] |
2863
| [[info:libc:Basic Signal Handling]] |
2865
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2867
perror_plus("sigaction");
2870
if(old_sigterm_action.sa_handler != SIG_IGN){
2871
ret = sigaction(SIGINT, &sigterm_action, NULL);
2873
perror_plus("sigaction");
2874
exitcode = EX_OSERR;
2878
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2880
perror_plus("sigaction");
2883
if(old_sigterm_action.sa_handler != SIG_IGN){
2884
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2886
perror_plus("sigaction");
2887
exitcode = EX_OSERR;
2891
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2893
perror_plus("sigaction");
2896
if(old_sigterm_action.sa_handler != SIG_IGN){
2897
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2899
perror_plus("sigaction");
2900
exitcode = EX_OSERR;
2905
/* If no interfaces were specified, make a list */
2906
if(mc.interfaces == NULL){
2907
struct dirent **direntries = NULL;
2908
/* Look for any good interfaces */
2909
ret = scandir(sys_class_net, &direntries, good_interface,
2912
/* Add all found interfaces to interfaces list */
2913
for(int i = 0; i < ret; ++i){
2914
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2915
direntries[i]->d_name);
2918
perror_plus("argz_add");
2919
free(direntries[i]);
2923
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2924
direntries[i]->d_name);
2926
free(direntries[i]);
2933
fprintf_plus(stderr, "Could not find a network interface\n");
729
AvahiSServiceBrowser *sb = NULL;
732
int exitcode = EXIT_SUCCESS;
733
const char *interface = "eth0";
734
struct ifreq network;
738
char *connect_to = NULL;
739
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
740
const char *pubkeyfile = "pubkey.txt";
741
const char *seckeyfile = "seckey.txt";
742
mandos_context mc = { .simple_poll = NULL, .server = NULL,
743
.dh_bits = 1024, .priority = "SECURE256"};
746
struct argp_option options[] = {
747
{ .name = "debug", .key = 128,
748
.doc = "Debug mode", .group = 3 },
749
{ .name = "connect", .key = 'c',
751
.doc = "Connect directly to a sepcified mandos server",
753
{ .name = "interface", .key = 'i',
755
.doc = "Interface that Avahi will conntect through",
757
{ .name = "keydir", .key = 'd',
759
.doc = "Directory where the openpgp keyring is",
761
{ .name = "seckey", .key = 's',
763
.doc = "Secret openpgp key for gnutls authentication",
765
{ .name = "pubkey", .key = 'p',
767
.doc = "Public openpgp key for gnutls authentication",
769
{ .name = "dh-bits", .key = 129,
771
.doc = "dh-bits to use in gnutls communication",
773
{ .name = "priority", .key = 130,
775
.doc = "GNUTLS priority", .group = 1 },
780
error_t parse_opt (int key, char *arg,
781
struct argp_state *state) {
782
/* Get the INPUT argument from `argp_parse', which we know is
783
a pointer to our plugin list pointer. */
805
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
820
return ARGP_ERR_UNKNOWN;
825
struct argp argp = { .options = options, .parser = parse_opt,
827
.doc = "Mandos client -- Get and decrypt"
828
" passwords from mandos server" };
829
argp_parse (&argp, argc, argv, 0, 0, NULL);
832
pubkeyfile = combinepath(keydir, pubkeyfile);
833
if (pubkeyfile == NULL){
834
perror("combinepath");
2934
835
exitcode = EXIT_FAILURE;
2939
/* Bring up interfaces which are down, and remove any "none"s */
2941
char *interface = NULL;
2942
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2944
/* If interface name is "none", stop bringing up interfaces.
2945
Also remove all instances of "none" from the list */
2946
if(strcmp(interface, "none") == 0){
2947
argz_delete(&mc.interfaces, &mc.interfaces_size,
2950
while((interface = argz_next(mc.interfaces,
2951
mc.interfaces_size, interface))){
2952
if(strcmp(interface, "none") == 0){
2953
argz_delete(&mc.interfaces, &mc.interfaces_size,
2960
bool interface_was_up = interface_is_up(interface);
2961
errno = bring_up_interface(interface, delay);
2962
if(not interface_was_up){
2964
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2965
" %s\n", interface, strerror(errno));
2967
errno = argz_add(&interfaces_to_take_down,
2968
&interfaces_to_take_down_size,
2971
perror_plus("argz_add");
2976
if(debug and (interfaces_to_take_down == NULL)){
2977
fprintf_plus(stderr, "No interfaces were brought up\n");
2981
/* If we only got one interface, explicitly use only that one */
2982
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2984
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2987
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2994
#if GNUTLS_VERSION_NUMBER >= 0x030606
2995
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
2996
#elif GNUTLS_VERSION_NUMBER < 0x030600
2997
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2999
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3002
fprintf_plus(stderr, "init_gnutls_global failed\n");
3003
exitcode = EX_UNAVAILABLE;
3006
gnutls_initialized = true;
3013
/* Try /run/tmp before /tmp */
3014
tempdir = mkdtemp(run_tempdir);
3015
if(tempdir == NULL and errno == ENOENT){
3017
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3018
run_tempdir, old_tempdir);
3020
tempdir = mkdtemp(old_tempdir);
3022
if(tempdir == NULL){
3023
perror_plus("mkdtemp");
3031
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3032
fprintf_plus(stderr, "init_gpgme failed\n");
3033
exitcode = EX_UNAVAILABLE;
3036
gpgme_initialized = true;
3043
if(connect_to != NULL){
3044
/* Connect directly, do not use Zeroconf */
3045
/* (Mainly meant for debugging) */
3046
char *address = strrchr(connect_to, ':');
3048
if(address == NULL){
3049
fprintf_plus(stderr, "No colon in address\n");
3050
exitcode = EX_USAGE;
3060
tmpmax = strtoimax(address+1, &tmp, 10);
3061
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3062
or tmpmax != (in_port_t)tmpmax){
3063
fprintf_plus(stderr, "Bad port number\n");
3064
exitcode = EX_USAGE;
3072
port = (in_port_t)tmpmax;
3074
/* Colon in address indicates IPv6 */
3076
if(strchr(connect_to, ':') != NULL){
3078
/* Accept [] around IPv6 address - see RFC 5952 */
3079
if(connect_to[0] == '[' and address[-1] == ']')
3087
address = connect_to;
3093
while(not quit_now){
3094
ret = start_mandos_communication(address, port, if_index, af,
3096
if(quit_now or ret == 0){
3100
fprintf_plus(stderr, "Retrying in %d seconds\n",
3101
(int)retry_interval);
3103
sleep((unsigned int)retry_interval);
3107
exitcode = EXIT_SUCCESS;
3118
AvahiServerConfig config;
3119
/* Do not publish any local Zeroconf records */
3120
avahi_server_config_init(&config);
3121
config.publish_hinfo = 0;
3122
config.publish_addresses = 0;
3123
config.publish_workstation = 0;
3124
config.publish_domain = 0;
3126
/* Allocate a new server */
3127
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3128
&config, NULL, NULL, &ret);
3130
/* Free the Avahi configuration data */
3131
avahi_server_config_free(&config);
3134
/* Check if creating the Avahi server object succeeded */
3135
if(mc.server == NULL){
3136
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3137
avahi_strerror(ret));
3138
exitcode = EX_UNAVAILABLE;
3146
/* Create the Avahi service browser */
3147
sb = avahi_s_service_browser_new(mc.server, if_index,
3148
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3149
NULL, 0, browse_callback,
3152
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3153
avahi_strerror(avahi_server_errno(mc.server)));
3154
exitcode = EX_UNAVAILABLE;
3162
/* Run the main loop */
3165
fprintf_plus(stderr, "Starting Avahi loop search\n");
3168
ret = avahi_loop_with_timeout(simple_poll,
3169
(int)(retry_interval * 1000), &mc);
3171
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3172
(ret == 0) ? "successfully" : "with error");
839
seckeyfile = combinepath(keydir, seckeyfile);
840
if (seckeyfile == NULL){
841
perror("combinepath");
845
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
847
fprintf(stderr, "init_gnutls_global\n");
864
if_index = (AvahiIfIndex) if_nametoindex(interface);
866
fprintf(stderr, "No such interface: \"%s\"\n", interface);
870
if(connect_to != NULL){
871
/* Connect directly, do not use Zeroconf */
872
/* (Mainly meant for debugging) */
873
char *address = strrchr(connect_to, ':');
875
fprintf(stderr, "No colon in address\n");
876
exitcode = EXIT_FAILURE;
880
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
882
perror("Bad port number");
883
exitcode = EXIT_FAILURE;
887
address = connect_to;
888
ret = start_mandos_communication(address, port, if_index, &mc);
890
exitcode = EXIT_FAILURE;
892
exitcode = EXIT_SUCCESS;
897
/* If the interface is down, bring it up */
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
902
exitcode = EXIT_FAILURE;
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
925
avahi_set_log_function(empty_log);
928
/* Initialize the pseudo-RNG for Avahi */
929
srand((unsigned int) time(NULL));
931
/* Allocate main Avahi loop object */
932
mc.simple_poll = avahi_simple_poll_new();
933
if (mc.simple_poll == NULL) {
934
fprintf(stderr, "Avahi: Failed to create simple poll"
936
exitcode = EXIT_FAILURE;
941
AvahiServerConfig config;
942
/* Do not publish any local Zeroconf records */
943
avahi_server_config_init(&config);
944
config.publish_hinfo = 0;
945
config.publish_addresses = 0;
946
config.publish_workstation = 0;
947
config.publish_domain = 0;
949
/* Allocate a new server */
950
mc.server = avahi_server_new(avahi_simple_poll_get
951
(mc.simple_poll), &config, NULL,
954
/* Free the Avahi configuration data */
955
avahi_server_config_free(&config);
958
/* Check if creating the Avahi server object succeeded */
959
if (mc.server == NULL) {
960
fprintf(stderr, "Failed to create Avahi server: %s\n",
961
avahi_strerror(error));
962
exitcode = EXIT_FAILURE;
966
/* Create the Avahi service browser */
967
sb = avahi_s_service_browser_new(mc.server, if_index,
969
"_mandos._tcp", NULL, 0,
970
browse_callback, &mc);
972
fprintf(stderr, "Failed to create service browser: %s\n",
973
avahi_strerror(avahi_server_errno(mc.server)));
974
exitcode = EXIT_FAILURE;
978
/* Run the main loop */
981
fprintf(stderr, "Starting Avahi loop search\n");
984
avahi_simple_poll_loop(mc.simple_poll);
3178
if(signal_received){
3179
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3180
argv[0], signal_received,
3181
strsignal(signal_received));
3183
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3187
/* Cleanup things */
3188
free(mc.interfaces);
3191
avahi_s_service_browser_free(sb);
3193
if(mc.server != NULL)
3194
avahi_server_free(mc.server);
3196
if(simple_poll != NULL)
3197
avahi_simple_poll_free(simple_poll);
3199
if(gnutls_initialized){
3200
gnutls_certificate_free_credentials(mc.cred);
3201
gnutls_dh_params_deinit(mc.dh_params);
3204
if(gpgme_initialized){
3205
gpgme_release(mc.ctx);
3208
/* Cleans up the circular linked list of Mandos servers the client
3210
if(mc.current_server != NULL){
3211
mc.current_server->prev->next = NULL;
3212
while(mc.current_server != NULL){
3213
server *next = mc.current_server->next;
3215
#pragma GCC diagnostic push
3216
#pragma GCC diagnostic ignored "-Wcast-qual"
3218
free((char *)(mc.current_server->ip));
3220
#pragma GCC diagnostic pop
3222
free(mc.current_server);
3223
mc.current_server = next;
3227
/* Re-raise privileges */
3229
ret = raise_privileges();
3232
perror_plus("Failed to raise privileges");
3235
/* Run network hooks */
3236
run_network_hooks("stop", interfaces_hooks != NULL ?
3237
interfaces_hooks : "", delay);
3239
/* Take down the network interfaces which were brought up */
3241
char *interface = NULL;
3242
while((interface = argz_next(interfaces_to_take_down,
3243
interfaces_to_take_down_size,
3245
ret = take_down_interface(interface);
3248
perror_plus("Failed to take down interface");
3251
if(debug and (interfaces_to_take_down == NULL)){
3252
fprintf_plus(stderr, "No interfaces needed to be taken"
3258
ret = lower_privileges_permanently();
3261
perror_plus("Failed to lower privileges permanently");
3265
free(interfaces_to_take_down);
3266
free(interfaces_hooks);
3268
void clean_dir_at(int base, const char * const dirname,
3270
struct dirent **direntries = NULL;
3272
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3278
perror_plus("open");
3281
int numentries = scandirat(dir_fd, ".", &direntries,
3282
notdotentries, alphasort);
3283
if(numentries >= 0){
3284
for(int i = 0; i < numentries; i++){
3286
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3287
dirname, direntries[i]->d_name);
3289
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3291
if(errno == EISDIR){
3292
dret = unlinkat(dir_fd, direntries[i]->d_name,
3295
if((dret == -1) and (errno == ENOTEMPTY)
3296
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3297
== 0) and (level == 0)){
3298
/* Recurse only in this special case */
3299
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3302
if((dret == -1) and (errno != ENOENT)){
3303
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3304
direntries[i]->d_name, strerror(errno));
3307
free(direntries[i]);
3310
/* need to clean even if 0 because man page doesn't specify */
3312
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3313
if(dret == -1 and errno != ENOENT){
3314
perror_plus("rmdir");
3317
perror_plus("scandirat");
3322
/* Removes the GPGME temp directory and all files inside */
3323
if(tempdir != NULL){
3324
clean_dir_at(-1, tempdir, 0);
3328
sigemptyset(&old_sigterm_action.sa_mask);
3329
old_sigterm_action.sa_handler = SIG_DFL;
3330
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3331
&old_sigterm_action,
3334
perror_plus("sigaction");
3337
ret = raise(signal_received);
3338
} while(ret != 0 and errno == EINTR);
3340
perror_plus("raise");
3343
TEMP_FAILURE_RETRY(pause());
989
fprintf(stderr, "%s exiting\n", argv[0]);
994
avahi_s_service_browser_free(sb);
996
if (mc.server != NULL)
997
avahi_server_free(mc.server);
999
if (mc.simple_poll != NULL)
1000
avahi_simple_poll_free(mc.simple_poll);