51
117
#include <avahi-common/malloc.h>
52
118
#include <avahi-common/error.h>
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 */
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 */
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,
72
#include <errno.h> /* perror() */
137
#include <gpgme.h> /* All GPGME types, constants and
140
GPGME_PROTOCOL_OpenPGP,
75
143
#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"
77
152
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
80
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
153
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;
83
174
/* Used for passing in values through the Avahi callback functions */
85
AvahiSimplePoll *simple_poll;
86
176
AvahiServer *server;
87
177
gnutls_certificate_credentials_t cred;
88
178
unsigned int dh_bits;
89
179
gnutls_dh_params_t dh_params;
90
180
const char *priority;
182
server *current_server;
184
size_t interfaces_size;
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
96
size_t adjustbuffer(char **buffer, size_t buffer_length,
97
size_t buffer_capacity){
98
if (buffer_length + BUFFER_SIZE > buffer_capacity){
99
*buffer = realloc(*buffer, buffer_capacity + BUFFER_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,
215
* "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;
103
230
buffer_capacity += BUFFER_SIZE;
105
232
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){
109
* Decrypt OpenPGP data using keyrings in HOMEDIR.
110
* Returns -1 on error
112
static ssize_t pgp_packet_decrypt (const char *cryptotext,
115
const char *homedir){
116
gpgme_data_t dh_crypto, dh_plain;
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,
118
343
gpgme_error_t rc;
120
size_t plaintext_capacity = 0;
121
ssize_t plaintext_length = 0;
122
344
gpgme_engine_info_t engine_info;
125
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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");
129
512
gpgme_check_version(NULL);
130
513
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
131
if (rc != GPG_ERR_NO_ERROR){
132
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
133
gpgme_strsource(rc), gpgme_strerror(rc));
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));
137
520
/* Set GPGME home directory for the OpenPGP engine only */
138
rc = gpgme_get_engine_info (&engine_info);
139
if (rc != GPG_ERR_NO_ERROR){
140
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
141
gpgme_strsource(rc), gpgme_strerror(rc));
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));
144
527
while(engine_info != NULL){
145
528
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
146
529
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
147
engine_info->file_name, homedir);
530
engine_info->file_name, tempdir);
150
533
engine_info = engine_info->next;
152
535
if(engine_info == NULL){
153
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
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");
157
575
/* Create new GPGME data buffer from memory cryptotext */
158
576
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
160
if (rc != GPG_ERR_NO_ERROR){
161
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
162
gpgme_strsource(rc), gpgme_strerror(rc));
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));
166
584
/* Create new empty GPGME data buffer for the plaintext */
167
585
rc = gpgme_data_new(&dh_plain);
168
if (rc != GPG_ERR_NO_ERROR){
169
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
170
gpgme_strsource(rc), gpgme_strerror(rc));
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));
171
589
gpgme_data_release(dh_crypto);
175
/* Create new GPGME "context" */
176
rc = gpgme_new(&ctx);
177
if (rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_new: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
180
plaintext_length = -1;
184
593
/* Decrypt data from the cryptotext data buffer to the plaintext
186
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
187
if (rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
189
gpgme_strsource(rc), gpgme_strerror(rc));
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));
190
599
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");
191
626
goto decrypt_end;
195
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
221
recipient = recipient->next;
630
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
227
633
/* Seek back to the beginning of the GPGME plaintext data buffer */
228
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
perror("pgpme_data_seek");
634
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
635
perror_plus("gpgme_data_seek");
230
636
plaintext_length = -1;
231
637
goto decrypt_end;
234
640
*plaintext = NULL;
236
plaintext_capacity = adjustbuffer(plaintext,
237
(size_t)plaintext_length,
239
if (plaintext_capacity == 0){
240
perror("adjustbuffer");
241
plaintext_length = -1;
642
plaintext_capacity = incbuffer(plaintext,
643
(size_t)plaintext_length,
645
if(plaintext_capacity == 0){
646
perror_plus("incbuffer");
647
plaintext_length = -1;
245
651
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
247
653
/* Print the data, if any */
253
perror("gpgme_data_read");
659
perror_plus("gpgme_data_read");
254
660
plaintext_length = -1;
255
661
goto decrypt_end;
257
663
plaintext_length += ret;
261
fprintf(stderr, "Decrypted password is: ");
667
fprintf_plus(stderr, "Decrypted password is: ");
262
668
for(ssize_t i = 0; i < plaintext_length; i++){
263
669
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
315
723
/* OpenPGP credentials */
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
317
!= GNUTLS_E_SUCCESS) {
318
fprintf (stderr, "GnuTLS memory error: %s\n",
319
safer_gnutls_strerror(ret));
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));
324
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
732
fprintf_plus(stderr, "Attempting to use public key %s and"
733
" private key %s as GnuTLS credentials\n",
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
329
751
ret = gnutls_certificate_set_openpgp_key_file
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
331
if (ret != GNUTLS_E_SUCCESS) {
333
"Error[%d] while reading the OpenPGP key pair ('%s',"
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
335
fprintf(stdout, "The GnuTLS error is: %s\n",
336
safer_gnutls_strerror(ret));
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));
340
766
/* GnuTLS server initialization */
341
767
ret = gnutls_dh_params_init(&mc->dh_params);
342
if (ret != GNUTLS_E_SUCCESS) {
343
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
" %s\n", safer_gnutls_strerror(ret));
347
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
if (ret != GNUTLS_E_SUCCESS) {
349
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
safer_gnutls_strerror(ret));
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);
354
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);
359
static int init_gnutls_session(mandos_context *mc,
360
gnutls_session_t *session){
966
__attribute__((nonnull, warn_unused_result))
967
static int init_gnutls_session(gnutls_session_t *session,
362
970
/* GnuTLS session creation */
363
ret = gnutls_init(session, GNUTLS_SERVER);
364
if (ret != GNUTLS_E_SUCCESS){
365
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
366
safer_gnutls_strerror(ret));
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));
371
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
372
if (ret != GNUTLS_E_SUCCESS) {
373
fprintf(stderr, "Syntax error at: %s\n", err);
374
fprintf(stderr, "GnuTLS error: %s\n",
375
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);
380
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
384
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);
388
1023
/* ignore client certificate if any. */
389
gnutls_certificate_server_set_request (*session,
392
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
1024
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
398
1030
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
399
1031
__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");
1080
/* Reset supplementary groups */
1082
ret = setgroups(0, NULL);
1084
perror_plus("setgroups");
1089
ret = dup2(devnull, STDIN_FILENO);
1091
perror_plus("dup2(devnull, STDIN_FILENO)");
1095
ret = close(devnull);
1097
perror_plus("close");
1099
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1101
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1104
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
1109
if(helperdir_fd == -1){
1110
perror_plus("open");
1111
_exit(EX_UNAVAILABLE);
1113
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
1115
if(helper_fd == -1){
1116
perror_plus("openat");
1117
close(helperdir_fd);
1118
_exit(EX_UNAVAILABLE);
1120
close(helperdir_fd);
1122
#pragma GCC diagnostic push
1123
#pragma GCC diagnostic ignored "-Wcast-qual"
1125
if(fexecve(helper_fd, (char *const [])
1126
{ helper, add ? add_arg : delete_arg, (char *)address,
1127
interface, debug ? debug_flag : NULL, NULL },
1130
#pragma GCC diagnostic pop
1132
perror_plus("fexecve");
1133
_exit(EXIT_FAILURE);
1137
perror_plus("fork");
1141
ret = close(devnull);
1143
perror_plus("close");
1149
pret = waitpid(pid, &status, 0);
1150
if(pret == -1 and errno == EINTR and quit_now){
1151
int errno_raising = 0;
1152
if((errno = raise_privileges()) != 0){
1153
errno_raising = errno;
1154
perror_plus("Failed to raise privileges in order to"
1155
" kill helper program");
1157
if(kill(pid, SIGTERM) == -1){
1158
perror_plus("kill");
1160
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
1161
perror_plus("Failed to lower privileges after killing"
1166
} while(pret == -1 and errno == EINTR);
1168
perror_plus("waitpid");
1171
if(WIFEXITED(status)){
1172
if(WEXITSTATUS(status) != 0){
1173
fprintf_plus(stderr, "Error: iprouteadddel exited"
1174
" with status %d\n", WEXITSTATUS(status));
1179
if(WIFSIGNALED(status)){
1180
fprintf_plus(stderr, "Error: iprouteadddel died by"
1181
" signal %d\n", WTERMSIG(status));
1184
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1188
__attribute__((nonnull, warn_unused_result))
1189
static bool add_local_route(const char *address,
1190
AvahiIfIndex if_index){
1192
fprintf_plus(stderr, "Adding route to %s\n", address);
1194
return add_delete_local_route(true, address, if_index);
1197
__attribute__((nonnull, warn_unused_result))
1198
static bool delete_local_route(const char *address,
1199
AvahiIfIndex if_index){
1201
fprintf_plus(stderr, "Removing route to %s\n", address);
1203
return add_delete_local_route(false, address, if_index);
401
1206
/* Called when a Mandos server is found */
402
static int start_mandos_communication(const char *ip, uint16_t port,
1207
__attribute__((nonnull, warn_unused_result))
1208
static int start_mandos_communication(const char *ip, in_port_t port,
403
1209
AvahiIfIndex if_index,
406
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1210
int af, mandos_context *mc){
1211
int ret, tcp_sd = -1;
1213
struct sockaddr_storage to;
407
1214
char *buffer = NULL;
408
char *decrypted_buffer;
1215
char *decrypted_buffer = NULL;
409
1216
size_t buffer_length = 0;
410
1217
size_t buffer_capacity = 0;
411
ssize_t decrypted_buffer_size;
414
char interface[IF_NAMESIZE];
415
1220
gnutls_session_t session;
417
ret = init_gnutls_session (mc, &session);
423
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
427
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
434
if(if_indextoname((unsigned int)if_index, interface) == NULL){
435
perror("if_indextoname");
1221
int pf; /* Protocol family */
1222
bool route_added = false;
1239
fprintf_plus(stderr, "Bad address family: %d\n", af);
1244
/* If the interface is specified and we have a list of interfaces */
1245
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1246
/* Check if the interface is one of the interfaces we are using */
1249
char *interface = NULL;
1250
while((interface = argz_next(mc->interfaces,
1251
mc->interfaces_size,
1253
if(if_nametoindex(interface) == (unsigned int)if_index){
1260
/* This interface does not match any in the list, so we don't
1261
connect to the server */
1263
char interface[IF_NAMESIZE];
1264
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1265
perror_plus("if_indextoname");
1267
fprintf_plus(stderr, "Skipping server on non-used interface"
1269
if_indextoname((unsigned int)if_index,
438
fprintf(stderr, "Binding to interface %s\n", interface);
441
memset(&to,0,sizeof(to)); /* Spurious warning */
442
to.in6.sin6_family = AF_INET6;
443
/* It would be nice to have a way to detect if we were passed an
444
IPv4 address here. Now we assume an IPv6 address. */
445
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1277
ret = init_gnutls_session(&session, mc);
1283
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1284
PRIuMAX "\n", ip, (uintmax_t)port);
1287
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1290
perror_plus("socket");
1301
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1302
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1303
ret = inet_pton(af, ip, &to6->sin6_addr);
1305
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1306
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1307
ret = inet_pton(af, ip, &to4->sin_addr);
1311
perror_plus("inet_pton");
451
fprintf(stderr, "Bad address: %s\n", ip);
454
to.in6.sin6_port = htons(port); /* Spurious warning */
1317
fprintf_plus(stderr, "Bad address: %s\n", ip);
1322
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1323
if(IN6_IS_ADDR_LINKLOCAL
1324
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1325
if(if_index == AVAHI_IF_UNSPEC){
1326
fprintf_plus(stderr, "An IPv6 link-local address is"
1327
" incomplete without a network interface\n");
1331
/* Set the network interface number as scope */
1332
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1335
((struct sockaddr_in *)&to)->sin_port = htons(port);
456
to.in6.sin6_scope_id = (uint32_t)if_index;
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
460
char addrstr[INET6_ADDRSTRLEN] = "";
461
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
sizeof(addrstr)) == NULL){
465
if(strcmp(addrstr, ip) != 0){
466
fprintf(stderr, "Canonical address form: %s\n", addrstr);
471
ret = connect(tcp_sd, &to.in, sizeof(to));
1344
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1345
char interface[IF_NAMESIZE];
1346
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1347
perror_plus("if_indextoname");
1349
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1350
"\n", ip, interface, (uintmax_t)port);
1353
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1354
ip, (uintmax_t)port);
1356
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1357
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1359
ret = getnameinfo((struct sockaddr *)&to,
1360
sizeof(struct sockaddr_in6),
1361
addrstr, sizeof(addrstr), NULL, 0,
1364
ret = getnameinfo((struct sockaddr *)&to,
1365
sizeof(struct sockaddr_in),
1366
addrstr, sizeof(addrstr), NULL, 0,
1369
if(ret == EAI_SYSTEM){
1370
perror_plus("getnameinfo");
1371
} else if(ret != 0) {
1372
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1373
} else if(strcmp(addrstr, ip) != 0){
1374
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1385
ret = connect(tcp_sd, (struct sockaddr *)&to,
1386
sizeof(struct sockaddr_in6));
1388
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1389
sizeof(struct sockaddr_in));
1392
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1393
and if_index != AVAHI_IF_UNSPEC
1394
and connect_to == NULL
1395
and not route_added and
1396
((af == AF_INET6 and not
1397
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1399
or (af == AF_INET and
1400
/* Not a a IPv4LL address */
1401
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1402
& 0xFFFF0000L) != 0xA9FE0000L))){
1403
/* Work around Avahi bug - Avahi does not announce link-local
1404
addresses if it has a global address, so local hosts with
1405
*only* a link-local address (e.g. Mandos clients) cannot
1406
connect to a Mandos server announced by Avahi on a server
1407
host with a global address. Work around this by retrying
1408
with an explicit route added with the server's address.
1410
Avahi bug reference:
1411
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1412
https://bugs.debian.org/587961
1415
fprintf_plus(stderr, "Mandos server unreachable, trying"
1419
route_added = add_local_route(ip, if_index);
1425
if(errno != ECONNREFUSED or debug){
1427
perror_plus("connect");
477
1440
const char *out = mandos_protocol_version;
480
1443
size_t out_size = strlen(out);
481
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
482
out_size - written));
1444
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1445
out_size - written));
1448
perror_plus("write");
486
1450
goto mandos_end;
488
1452
written += (size_t)ret;
489
1453
if(written < out_size){
492
if (out == mandos_protocol_version){
1456
if(out == mandos_protocol_version){
502
fprintf(stderr, "Establishing TLS session with %s\n", ip);
505
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
507
ret = gnutls_handshake (session);
509
if (ret != GNUTLS_E_SUCCESS){
1471
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1479
/* This casting via intptr_t is to eliminate warning about casting
1480
an int to a pointer type. This is exactly how the GnuTLS Guile
1481
function "set-session-transport-fd!" does it. */
1482
gnutls_transport_set_ptr(session,
1483
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1491
ret = gnutls_handshake(session);
1496
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1498
if(ret != GNUTLS_E_SUCCESS){
511
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1500
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
515
1504
goto mandos_end;
518
1507
/* Read OpenPGP packet that contains the wanted password */
521
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1510
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
526
buffer_capacity = adjustbuffer(&buffer, buffer_length,
528
if (buffer_capacity == 0){
529
perror("adjustbuffer");
534
ret = gnutls_record_recv(session, buffer+buffer_length,
1521
buffer_capacity = incbuffer(&buffer, buffer_length,
1523
if(buffer_capacity == 0){
1525
perror_plus("incbuffer");
1535
sret = gnutls_record_recv(session, buffer+buffer_length,
541
1542
case GNUTLS_E_INTERRUPTED:
542
1543
case GNUTLS_E_AGAIN:
544
1545
case GNUTLS_E_REHANDSHAKE:
545
ret = gnutls_handshake (session);
547
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1547
ret = gnutls_handshake(session);
1553
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1555
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
550
1559
goto mandos_end;
554
fprintf(stderr, "Unknown error while reading data from"
555
" encrypted session with Mandos server\n");
557
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1563
fprintf_plus(stderr, "Unknown error while reading data from"
1564
" encrypted session with Mandos server\n");
1565
gnutls_bye(session, GNUTLS_SHUT_RDWR);
558
1567
goto mandos_end;
561
buffer_length += (size_t) ret;
1570
buffer_length += (size_t) sret;
566
fprintf(stderr, "Closing TLS session\n");
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
571
if (buffer_length > 0){
572
decrypted_buffer_size = pgp_packet_decrypt(buffer,
576
if (decrypted_buffer_size >= 0){
1575
fprintf_plus(stderr, "Closing TLS session\n");
1584
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1589
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1591
if(buffer_length > 0){
1592
ssize_t decrypted_buffer_size;
1593
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1594
&decrypted_buffer, mc);
1595
if(decrypted_buffer_size >= 0){
578
1599
while(written < (size_t) decrypted_buffer_size){
579
ret = (int)fwrite (decrypted_buffer + written, 1,
580
(size_t)decrypted_buffer_size - written,
1605
ret = (int)fwrite(decrypted_buffer + written, 1,
1606
(size_t)decrypted_buffer_size - written,
582
1608
if(ret == 0 and ferror(stdout)){
584
fprintf(stderr, "Error writing encrypted data: %s\n",
1611
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
590
1617
written += (size_t)ret;
592
free(decrypted_buffer);
1619
ret = fflush(stdout);
1623
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
598
1633
/* Shutdown procedure */
603
gnutls_deinit (session);
604
gnutls_certificate_free_credentials (mc->cred);
605
gnutls_global_deinit ();
1638
if(not delete_local_route(ip, if_index)){
1639
fprintf_plus(stderr, "Failed to delete local route to %s on"
1640
" interface %d", ip, if_index);
1644
free(decrypted_buffer);
1647
ret = close(tcp_sd);
1653
perror_plus("close");
1655
gnutls_deinit(session);
609
1665
static void resolve_callback(AvahiSServiceResolver *r,
610
1666
AvahiIfIndex interface,
611
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1667
AvahiProtocol proto,
612
1668
AvahiResolverEvent event,
613
1669
const char *name,
614
1670
const char *type,
696
1779
case AVAHI_BROWSER_ALL_FOR_NOW:
697
1780
case AVAHI_BROWSER_CACHE_EXHAUSTED:
699
fprintf(stderr, "No Mandos server found, still searching...\n");
1782
fprintf_plus(stderr, "No Mandos server found, still"
705
/* Combines file name and path and returns the malloced new
706
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
715
memcpy(tmp, first, f_len); /* Spurious warning */
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
721
tmp[f_len + 1 + s_len] = '\0';
1789
/* Signal handler that stops main loop after SIGTERM */
1790
static void handle_sigterm(int sig){
1795
signal_received = sig;
1796
int old_errno = errno;
1797
/* set main loop to exit */
1798
if(simple_poll != NULL){
1799
avahi_simple_poll_quit(simple_poll);
1804
__attribute__((nonnull, warn_unused_result))
1805
bool get_flags(const char *ifname, struct ifreq *ifr){
1809
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1812
perror_plus("socket");
1816
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1817
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1818
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1822
perror_plus("ioctl SIOCGIFFLAGS");
1825
if((close(s) == -1) and debug){
1827
perror_plus("close");
1832
if((close(s) == -1) and debug){
1834
perror_plus("close");
1840
__attribute__((nonnull, warn_unused_result))
1841
bool good_flags(const char *ifname, const struct ifreq *ifr){
1843
/* Reject the loopback device */
1844
if(ifr->ifr_flags & IFF_LOOPBACK){
1846
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1851
/* Accept point-to-point devices only if connect_to is specified */
1852
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1854
fprintf_plus(stderr, "Accepting point-to-point interface"
1855
" \"%s\"\n", ifname);
1859
/* Otherwise, reject non-broadcast-capable devices */
1860
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1862
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1863
" \"%s\"\n", ifname);
1867
/* Reject non-ARP interfaces (including dummy interfaces) */
1868
if(ifr->ifr_flags & IFF_NOARP){
1870
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1876
/* Accept this device */
1878
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1884
* This function determines if a directory entry in /sys/class/net
1885
* corresponds to an acceptable network device.
1886
* (This function is passed to scandir(3) as a filter function.)
1888
__attribute__((nonnull, warn_unused_result))
1889
int good_interface(const struct dirent *if_entry){
1890
if(if_entry->d_name[0] == '.'){
1895
if(not get_flags(if_entry->d_name, &ifr)){
1897
fprintf_plus(stderr, "Failed to get flags for interface "
1898
"\"%s\"\n", if_entry->d_name);
1903
if(not good_flags(if_entry->d_name, &ifr)){
1910
* This function determines if a network interface is up.
1912
__attribute__((nonnull, warn_unused_result))
1913
bool interface_is_up(const char *interface){
1915
if(not get_flags(interface, &ifr)){
1917
fprintf_plus(stderr, "Failed to get flags for interface "
1918
"\"%s\"\n", interface);
1923
return (bool)(ifr.ifr_flags & IFF_UP);
1927
* This function determines if a network interface is running
1929
__attribute__((nonnull, warn_unused_result))
1930
bool interface_is_running(const char *interface){
1932
if(not get_flags(interface, &ifr)){
1934
fprintf_plus(stderr, "Failed to get flags for interface "
1935
"\"%s\"\n", interface);
1940
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1943
__attribute__((nonnull, pure, warn_unused_result))
1944
int notdotentries(const struct dirent *direntry){
1945
/* Skip "." and ".." */
1946
if(direntry->d_name[0] == '.'
1947
and (direntry->d_name[1] == '\0'
1948
or (direntry->d_name[1] == '.'
1949
and direntry->d_name[2] == '\0'))){
1955
/* Is this directory entry a runnable program? */
1956
__attribute__((nonnull, warn_unused_result))
1957
int runnable_hook(const struct dirent *direntry){
1962
if((direntry->d_name)[0] == '\0'){
1967
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1968
"abcdefghijklmnopqrstuvwxyz"
1971
if((direntry->d_name)[sret] != '\0'){
1972
/* Contains non-allowed characters */
1974
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1980
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1983
perror_plus("Could not stat hook");
1987
if(not (S_ISREG(st.st_mode))){
1988
/* Not a regular file */
1990
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1995
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1996
/* Not executable */
1998
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
2004
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
2010
__attribute__((nonnull, warn_unused_result))
2011
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
2012
mandos_context *mc){
2014
struct timespec now;
2015
struct timespec waited_time;
2016
intmax_t block_time;
2019
if(mc->current_server == NULL){
2021
fprintf_plus(stderr, "Wait until first server is found."
2024
ret = avahi_simple_poll_iterate(s, -1);
2027
fprintf_plus(stderr, "Check current_server if we should run"
2030
/* the current time */
2031
ret = clock_gettime(CLOCK_MONOTONIC, &now);
2033
perror_plus("clock_gettime");
2036
/* Calculating in ms how long time between now and server
2037
who we visted longest time ago. Now - last seen. */
2038
waited_time.tv_sec = (now.tv_sec
2039
- mc->current_server->last_seen.tv_sec);
2040
waited_time.tv_nsec = (now.tv_nsec
2041
- mc->current_server->last_seen.tv_nsec);
2042
/* total time is 10s/10,000ms.
2043
Converting to s from ms by dividing by 1,000,
2044
and ns to ms by dividing by 1,000,000. */
2045
block_time = ((retry_interval
2046
- ((intmax_t)waited_time.tv_sec * 1000))
2047
- ((intmax_t)waited_time.tv_nsec / 1000000));
2050
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
2054
if(block_time <= 0){
2055
ret = start_mandos_communication(mc->current_server->ip,
2056
mc->current_server->port,
2057
mc->current_server->if_index,
2058
mc->current_server->af, mc);
2060
avahi_simple_poll_quit(s);
2063
ret = clock_gettime(CLOCK_MONOTONIC,
2064
&mc->current_server->last_seen);
2066
perror_plus("clock_gettime");
2069
mc->current_server = mc->current_server->next;
2070
block_time = 0; /* Call avahi to find new Mandos
2071
servers, but don't block */
2074
ret = avahi_simple_poll_iterate(s, (int)block_time);
2077
if(ret > 0 or errno != EINTR){
2078
return (ret != 1) ? ret : 0;
2084
__attribute__((nonnull))
2085
void run_network_hooks(const char *mode, const char *interface,
2087
struct dirent **direntries = NULL;
2088
if(hookdir_fd == -1){
2089
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
2091
if(hookdir_fd == -1){
2092
if(errno == ENOENT){
2094
fprintf_plus(stderr, "Network hook directory \"%s\" not"
2095
" found\n", hookdir);
2098
perror_plus("open");
2103
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
2105
perror_plus("open(\"/dev/null\", O_RDONLY)");
2108
int numhooks = scandirat(hookdir_fd, ".", &direntries,
2109
runnable_hook, alphasort);
2111
perror_plus("scandir");
2115
struct dirent *direntry;
2117
for(int i = 0; i < numhooks; i++){
2118
direntry = direntries[i];
2120
fprintf_plus(stderr, "Running network hook \"%s\"\n",
2123
pid_t hook_pid = fork();
2126
/* Raise privileges */
2127
errno = raise_privileges_permanently();
2129
perror_plus("Failed to raise privileges");
2136
perror_plus("setgid");
2139
/* Reset supplementary groups */
2141
ret = setgroups(0, NULL);
2143
perror_plus("setgroups");
2146
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
2148
perror_plus("setenv");
2151
ret = setenv("DEVICE", interface, 1);
2153
perror_plus("setenv");
2156
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
2158
perror_plus("setenv");
2161
ret = setenv("MODE", mode, 1);
2163
perror_plus("setenv");
2167
ret = asprintf(&delaystring, "%f", (double)delay);
2169
perror_plus("asprintf");
2172
ret = setenv("DELAY", delaystring, 1);
2175
perror_plus("setenv");
2179
if(connect_to != NULL){
2180
ret = setenv("CONNECT", connect_to, 1);
2182
perror_plus("setenv");
2186
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2190
perror_plus("openat");
2191
_exit(EXIT_FAILURE);
2193
if(close(hookdir_fd) == -1){
2194
perror_plus("close");
2195
_exit(EXIT_FAILURE);
2197
ret = dup2(devnull, STDIN_FILENO);
2199
perror_plus("dup2(devnull, STDIN_FILENO)");
2202
ret = close(devnull);
2204
perror_plus("close");
2207
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2209
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2212
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2214
perror_plus("fexecve");
2215
_exit(EXIT_FAILURE);
2219
perror_plus("fork");
2224
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2225
perror_plus("waitpid");
2229
if(WIFEXITED(status)){
2230
if(WEXITSTATUS(status) != 0){
2231
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2232
" with status %d\n", direntry->d_name,
2233
WEXITSTATUS(status));
2237
} else if(WIFSIGNALED(status)){
2238
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2239
" signal %d\n", direntry->d_name,
2244
fprintf_plus(stderr, "Warning: network hook \"%s\""
2245
" crashed\n", direntry->d_name);
2251
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2257
if(close(hookdir_fd) == -1){
2258
perror_plus("close");
2265
__attribute__((nonnull, warn_unused_result))
2266
int bring_up_interface(const char *const interface,
2268
int old_errno = errno;
2270
struct ifreq network;
2271
unsigned int if_index = if_nametoindex(interface);
2273
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2283
if(not interface_is_up(interface)){
2285
int ioctl_errno = 0;
2286
if(not get_flags(interface, &network)){
2288
fprintf_plus(stderr, "Failed to get flags for interface "
2289
"\"%s\"\n", interface);
2293
network.ifr_flags |= IFF_UP; /* set flag */
2295
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2298
perror_plus("socket");
2306
perror_plus("close");
2313
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2317
/* Raise privileges */
2318
ret_errno = raise_privileges();
2321
perror_plus("Failed to raise privileges");
2326
bool restore_loglevel = false;
2328
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2329
messages about the network interface to mess up the prompt */
2330
ret_linux = klogctl(8, NULL, 5);
2331
if(ret_linux == -1){
2332
perror_plus("klogctl");
2334
restore_loglevel = true;
2337
#endif /* __linux__ */
2338
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2339
ioctl_errno = errno;
2341
if(restore_loglevel){
2342
ret_linux = klogctl(7, NULL, 0);
2343
if(ret_linux == -1){
2344
perror_plus("klogctl");
2347
#endif /* __linux__ */
2349
/* If raise_privileges() succeeded above */
2351
/* Lower privileges */
2352
ret_errno = lower_privileges();
2355
perror_plus("Failed to lower privileges");
2359
/* Close the socket */
2362
perror_plus("close");
2365
if(ret_setflags == -1){
2366
errno = ioctl_errno;
2367
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2372
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2376
/* Sleep checking until interface is running.
2377
Check every 0.25s, up to total time of delay */
2378
for(int i = 0; i < delay * 4; i++){
2379
if(interface_is_running(interface)){
2382
struct timespec sleeptime = { .tv_nsec = 250000000 };
2383
ret = nanosleep(&sleeptime, NULL);
2384
if(ret == -1 and errno != EINTR){
2385
perror_plus("nanosleep");
2393
__attribute__((nonnull, warn_unused_result))
2394
int take_down_interface(const char *const interface){
2395
int old_errno = errno;
2396
struct ifreq network;
2397
unsigned int if_index = if_nametoindex(interface);
2399
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2403
if(interface_is_up(interface)){
2405
int ioctl_errno = 0;
2406
if(not get_flags(interface, &network) and debug){
2408
fprintf_plus(stderr, "Failed to get flags for interface "
2409
"\"%s\"\n", interface);
2413
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2415
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2418
perror_plus("socket");
2424
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2428
/* Raise privileges */
2429
ret_errno = raise_privileges();
2432
perror_plus("Failed to raise privileges");
2435
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2436
ioctl_errno = errno;
2438
/* If raise_privileges() succeeded above */
2440
/* Lower privileges */
2441
ret_errno = lower_privileges();
2444
perror_plus("Failed to lower privileges");
2448
/* Close the socket */
2449
int ret = close(sd);
2451
perror_plus("close");
2454
if(ret_setflags == -1){
2455
errno = ioctl_errno;
2456
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2461
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
726
2469
int main(int argc, char *argv[]){
727
AvahiSServiceBrowser *sb = NULL;
730
int exitcode = EXIT_SUCCESS;
731
const char *interface = "eth0";
732
struct ifreq network;
736
char *connect_to = NULL;
737
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
740
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
.dh_bits = 1024, .priority = "SECURE256"};
744
struct argp_option options[] = {
745
{ .name = "debug", .key = 128,
746
.doc = "Debug mode", .group = 3 },
747
{ .name = "connect", .key = 'c',
749
.doc = "Connect directly to a sepcified mandos server",
751
{ .name = "interface", .key = 'i',
753
.doc = "Interface that Avahi will conntect through",
755
{ .name = "keydir", .key = 'd',
757
.doc = "Directory where the openpgp keyring is",
759
{ .name = "seckey", .key = 's',
761
.doc = "Secret openpgp key for gnutls authentication",
763
{ .name = "pubkey", .key = 'p',
765
.doc = "Public openpgp key for gnutls authentication",
767
{ .name = "dh-bits", .key = 129,
769
.doc = "dh-bits to use in gnutls communication",
771
{ .name = "priority", .key = 130,
773
.doc = "GNUTLS priority", .group = 1 },
778
error_t parse_opt (int key, char *arg,
779
struct argp_state *state) {
780
/* Get the INPUT argument from `argp_parse', which we know is
781
a pointer to our plugin list pointer. */
803
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
818
return ARGP_ERR_UNKNOWN;
823
struct argp argp = { .options = options, .parser = parse_opt,
825
.doc = "Mandos client -- Get and decrypt"
826
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
832
perror("combinepath");
2470
mandos_context mc = { .server = NULL, .dh_bits = 0,
2471
#if GNUTLS_VERSION_NUMBER >= 0x030606
2472
.priority = "SECURE128:!CTYPE-X.509"
2473
":+CTYPE-RAWPK:!RSA:!VERS-ALL:+VERS-TLS1.3"
2475
#elif GNUTLS_VERSION_NUMBER < 0x030600
2476
.priority = "SECURE256:!CTYPE-X.509"
2477
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2479
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
2481
.current_server = NULL, .interfaces = NULL,
2482
.interfaces_size = 0 };
2483
AvahiSServiceBrowser *sb = NULL;
2488
int exitcode = EXIT_SUCCESS;
2489
char *interfaces_to_take_down = NULL;
2490
size_t interfaces_to_take_down_size = 0;
2491
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2492
char old_tempdir[] = "/tmp/mandosXXXXXX";
2493
char *tempdir = NULL;
2494
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2495
const char *seckey = PATHDIR "/" SECKEY;
2496
const char *pubkey = PATHDIR "/" PUBKEY;
2497
#if GNUTLS_VERSION_NUMBER >= 0x030606
2498
const char *tls_privkey = PATHDIR "/" TLS_PRIVKEY;
2499
const char *tls_pubkey = PATHDIR "/" TLS_PUBKEY;
2501
const char *dh_params_file = NULL;
2502
char *interfaces_hooks = NULL;
2504
bool gnutls_initialized = false;
2505
bool gpgme_initialized = false;
2507
double retry_interval = 10; /* 10s between trying a server and
2508
retrying the same server again */
2510
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2511
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2516
/* Lower any group privileges we might have, just to be safe */
2520
perror_plus("setgid");
2523
/* Lower user privileges (temporarily) */
2527
perror_plus("seteuid");
2535
struct argp_option options[] = {
2536
{ .name = "debug", .key = 128,
2537
.doc = "Debug mode", .group = 3 },
2538
{ .name = "connect", .key = 'c',
2539
.arg = "ADDRESS:PORT",
2540
.doc = "Connect directly to a specific Mandos server",
2542
{ .name = "interface", .key = 'i',
2544
.doc = "Network interface that will be used to search for"
2547
{ .name = "seckey", .key = 's',
2549
.doc = "OpenPGP secret key file base name",
2551
{ .name = "pubkey", .key = 'p',
2553
.doc = "OpenPGP public key file base name",
2555
{ .name = "tls-privkey", .key = 't',
2557
#if GNUTLS_VERSION_NUMBER >= 0x030606
2558
.doc = "TLS private key file base name",
2560
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2563
{ .name = "tls-pubkey", .key = 'T',
2565
#if GNUTLS_VERSION_NUMBER >= 0x030606
2566
.doc = "TLS public key file base name",
2568
.doc = "Dummy; ignored (requires GnuTLS 3.6.6)",
2571
{ .name = "dh-bits", .key = 129,
2573
.doc = "Bit length of the prime number used in the"
2574
" Diffie-Hellman key exchange",
2576
{ .name = "dh-params", .key = 134,
2578
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2579
" for the Diffie-Hellman key exchange",
2581
{ .name = "priority", .key = 130,
2583
.doc = "GnuTLS priority string for the TLS handshake",
2585
{ .name = "delay", .key = 131,
2587
.doc = "Maximum delay to wait for interface startup",
2589
{ .name = "retry", .key = 132,
2591
.doc = "Retry interval used when denied by the Mandos server",
2593
{ .name = "network-hook-dir", .key = 133,
2595
.doc = "Directory where network hooks are located",
2598
* These reproduce what we would get without ARGP_NO_HELP
2600
{ .name = "help", .key = '?',
2601
.doc = "Give this help list", .group = -1 },
2602
{ .name = "usage", .key = -3,
2603
.doc = "Give a short usage message", .group = -1 },
2604
{ .name = "version", .key = 'V',
2605
.doc = "Print program version", .group = -1 },
2609
error_t parse_opt(int key, char *arg,
2610
struct argp_state *state){
2613
case 128: /* --debug */
2616
case 'c': /* --connect */
2619
case 'i': /* --interface */
2620
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2623
argp_error(state, "%s", strerror(ret_errno));
2626
case 's': /* --seckey */
2629
case 'p': /* --pubkey */
2632
case 't': /* --tls-privkey */
2633
#if GNUTLS_VERSION_NUMBER >= 0x030606
2637
case 'T': /* --tls-pubkey */
2638
#if GNUTLS_VERSION_NUMBER >= 0x030606
2642
case 129: /* --dh-bits */
2644
tmpmax = strtoimax(arg, &tmp, 10);
2645
if(errno != 0 or tmp == arg or *tmp != '\0'
2646
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2647
argp_error(state, "Bad number of DH bits");
2649
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2651
case 134: /* --dh-params */
2652
dh_params_file = arg;
2654
case 130: /* --priority */
2657
case 131: /* --delay */
2659
delay = strtof(arg, &tmp);
2660
if(errno != 0 or tmp == arg or *tmp != '\0'){
2661
argp_error(state, "Bad delay");
2663
case 132: /* --retry */
2665
retry_interval = strtod(arg, &tmp);
2666
if(errno != 0 or tmp == arg or *tmp != '\0'
2667
or (retry_interval * 1000) > INT_MAX
2668
or retry_interval < 0){
2669
argp_error(state, "Bad retry interval");
2672
case 133: /* --network-hook-dir */
2676
* These reproduce what we would get without ARGP_NO_HELP
2678
case '?': /* --help */
2679
argp_state_help(state, state->out_stream,
2680
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2681
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2682
__builtin_unreachable();
2683
case -3: /* --usage */
2684
argp_state_help(state, state->out_stream,
2685
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2686
__builtin_unreachable();
2687
case 'V': /* --version */
2688
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2689
exit(argp_err_exit_status);
2692
return ARGP_ERR_UNKNOWN;
2697
struct argp argp = { .options = options, .parser = parse_opt,
2699
.doc = "Mandos client -- Get and decrypt"
2700
" passwords from a Mandos server" };
2701
ret_errno = argp_parse(&argp, argc, argv,
2702
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2709
perror_plus("argp_parse");
2710
exitcode = EX_OSERR;
2713
exitcode = EX_USAGE;
2719
/* Work around Debian bug #633582:
2720
<https://bugs.debian.org/633582> */
2722
/* Re-raise privileges */
2723
ret = raise_privileges();
2726
perror_plus("Failed to raise privileges");
2730
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2731
int seckey_fd = open(seckey, O_RDONLY);
2732
if(seckey_fd == -1){
2733
perror_plus("open");
2735
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2737
perror_plus("fstat");
2739
if(S_ISREG(st.st_mode)
2740
and st.st_uid == 0 and st.st_gid == 0){
2741
ret = fchown(seckey_fd, uid, gid);
2743
perror_plus("fchown");
2751
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2752
int pubkey_fd = open(pubkey, O_RDONLY);
2753
if(pubkey_fd == -1){
2754
perror_plus("open");
2756
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2758
perror_plus("fstat");
2760
if(S_ISREG(st.st_mode)
2761
and st.st_uid == 0 and st.st_gid == 0){
2762
ret = fchown(pubkey_fd, uid, gid);
2764
perror_plus("fchown");
2772
if(dh_params_file != NULL
2773
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2774
int dhparams_fd = open(dh_params_file, O_RDONLY);
2775
if(dhparams_fd == -1){
2776
perror_plus("open");
2778
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2780
perror_plus("fstat");
2782
if(S_ISREG(st.st_mode)
2783
and st.st_uid == 0 and st.st_gid == 0){
2784
ret = fchown(dhparams_fd, uid, gid);
2786
perror_plus("fchown");
2794
/* Lower privileges */
2795
ret = lower_privileges();
2798
perror_plus("Failed to lower privileges");
2803
/* Remove invalid interface names (except "none") */
2805
char *interface = NULL;
2806
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2808
if(strcmp(interface, "none") != 0
2809
and if_nametoindex(interface) == 0){
2810
if(interface[0] != '\0'){
2811
fprintf_plus(stderr, "Not using nonexisting interface"
2812
" \"%s\"\n", interface);
2814
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2820
/* Run network hooks */
2822
if(mc.interfaces != NULL){
2823
interfaces_hooks = malloc(mc.interfaces_size);
2824
if(interfaces_hooks == NULL){
2825
perror_plus("malloc");
2828
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2829
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2831
run_network_hooks("start", interfaces_hooks != NULL ?
2832
interfaces_hooks : "", delay);
2836
avahi_set_log_function(empty_log);
2839
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2840
from the signal handler */
2841
/* Initialize the pseudo-RNG for Avahi */
2842
srand((unsigned int) time(NULL));
2843
simple_poll = avahi_simple_poll_new();
2844
if(simple_poll == NULL){
2845
fprintf_plus(stderr,
2846
"Avahi: Failed to create simple poll object.\n");
2847
exitcode = EX_UNAVAILABLE;
2851
sigemptyset(&sigterm_action.sa_mask);
2852
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2854
perror_plus("sigaddset");
2855
exitcode = EX_OSERR;
2858
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2860
perror_plus("sigaddset");
2861
exitcode = EX_OSERR;
2864
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2866
perror_plus("sigaddset");
2867
exitcode = EX_OSERR;
2870
/* Need to check if the handler is SIG_IGN before handling:
2871
| [[info:libc:Initial Signal Actions]] |
2872
| [[info:libc:Basic Signal Handling]] |
2874
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2876
perror_plus("sigaction");
2879
if(old_sigterm_action.sa_handler != SIG_IGN){
2880
ret = sigaction(SIGINT, &sigterm_action, NULL);
2882
perror_plus("sigaction");
2883
exitcode = EX_OSERR;
2887
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2889
perror_plus("sigaction");
2892
if(old_sigterm_action.sa_handler != SIG_IGN){
2893
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2895
perror_plus("sigaction");
2896
exitcode = EX_OSERR;
2900
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2902
perror_plus("sigaction");
2905
if(old_sigterm_action.sa_handler != SIG_IGN){
2906
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2908
perror_plus("sigaction");
2909
exitcode = EX_OSERR;
2914
/* If no interfaces were specified, make a list */
2915
if(mc.interfaces == NULL){
2916
struct dirent **direntries = NULL;
2917
/* Look for any good interfaces */
2918
ret = scandir(sys_class_net, &direntries, good_interface,
2921
/* Add all found interfaces to interfaces list */
2922
for(int i = 0; i < ret; ++i){
2923
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2924
direntries[i]->d_name);
2927
perror_plus("argz_add");
2928
free(direntries[i]);
2932
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2933
direntries[i]->d_name);
2935
free(direntries[i]);
2942
fprintf_plus(stderr, "Could not find a network interface\n");
833
2943
exitcode = EXIT_FAILURE;
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
839
perror("combinepath");
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
845
fprintf(stderr, "init_gnutls_global\n");
862
if_index = (AvahiIfIndex) if_nametoindex(interface);
864
fprintf(stderr, "No such interface: \"%s\"\n", interface);
868
if(connect_to != NULL){
869
/* Connect directly, do not use Zeroconf */
870
/* (Mainly meant for debugging) */
871
char *address = strrchr(connect_to, ':');
873
fprintf(stderr, "No colon in address\n");
874
exitcode = EXIT_FAILURE;
878
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
880
perror("Bad port number");
881
exitcode = EXIT_FAILURE;
885
address = connect_to;
886
ret = start_mandos_communication(address, port, if_index, &mc);
888
exitcode = EXIT_FAILURE;
890
exitcode = EXIT_SUCCESS;
895
/* If the interface is down, bring it up */
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
exitcode = EXIT_FAILURE;
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
923
avahi_set_log_function(empty_log);
926
/* Initialize the pseudo-RNG for Avahi */
927
srand((unsigned int) time(NULL));
929
/* Allocate main Avahi loop object */
930
mc.simple_poll = avahi_simple_poll_new();
931
if (mc.simple_poll == NULL) {
932
fprintf(stderr, "Avahi: Failed to create simple poll"
934
exitcode = EXIT_FAILURE;
939
AvahiServerConfig config;
940
/* Do not publish any local Zeroconf records */
941
avahi_server_config_init(&config);
942
config.publish_hinfo = 0;
943
config.publish_addresses = 0;
944
config.publish_workstation = 0;
945
config.publish_domain = 0;
947
/* Allocate a new server */
948
mc.server = avahi_server_new(avahi_simple_poll_get
949
(mc.simple_poll), &config, NULL,
952
/* Free the Avahi configuration data */
953
avahi_server_config_free(&config);
956
/* Check if creating the Avahi server object succeeded */
957
if (mc.server == NULL) {
958
fprintf(stderr, "Failed to create Avahi server: %s\n",
959
avahi_strerror(error));
960
exitcode = EXIT_FAILURE;
964
/* Create the Avahi service browser */
965
sb = avahi_s_service_browser_new(mc.server, if_index,
967
"_mandos._tcp", NULL, 0,
968
browse_callback, &mc);
970
fprintf(stderr, "Failed to create service browser: %s\n",
971
avahi_strerror(avahi_server_errno(mc.server)));
972
exitcode = EXIT_FAILURE;
976
/* Run the main loop */
979
fprintf(stderr, "Starting Avahi loop search\n");
982
avahi_simple_poll_loop(mc.simple_poll);
2948
/* Bring up interfaces which are down, and remove any "none"s */
2950
char *interface = NULL;
2951
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2953
/* If interface name is "none", stop bringing up interfaces.
2954
Also remove all instances of "none" from the list */
2955
if(strcmp(interface, "none") == 0){
2956
argz_delete(&mc.interfaces, &mc.interfaces_size,
2959
while((interface = argz_next(mc.interfaces,
2960
mc.interfaces_size, interface))){
2961
if(strcmp(interface, "none") == 0){
2962
argz_delete(&mc.interfaces, &mc.interfaces_size,
2969
bool interface_was_up = interface_is_up(interface);
2970
errno = bring_up_interface(interface, delay);
2971
if(not interface_was_up){
2973
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2974
" %s\n", interface, strerror(errno));
2976
errno = argz_add(&interfaces_to_take_down,
2977
&interfaces_to_take_down_size,
2980
perror_plus("argz_add");
2985
if(debug and (interfaces_to_take_down == NULL)){
2986
fprintf_plus(stderr, "No interfaces were brought up\n");
2990
/* If we only got one interface, explicitly use only that one */
2991
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2993
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2996
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
3003
#if GNUTLS_VERSION_NUMBER >= 0x030606
3004
ret = init_gnutls_global(tls_pubkey, tls_privkey, dh_params_file, &mc);
3005
#elif GNUTLS_VERSION_NUMBER < 0x030600
3006
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
3008
#error "Needs GnuTLS 3.6.6 or later, or before 3.6.0"
3011
fprintf_plus(stderr, "init_gnutls_global failed\n");
3012
exitcode = EX_UNAVAILABLE;
3015
gnutls_initialized = true;
3022
/* Try /run/tmp before /tmp */
3023
tempdir = mkdtemp(run_tempdir);
3024
if(tempdir == NULL and errno == ENOENT){
3026
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
3027
run_tempdir, old_tempdir);
3029
tempdir = mkdtemp(old_tempdir);
3031
if(tempdir == NULL){
3032
perror_plus("mkdtemp");
3040
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
3041
fprintf_plus(stderr, "init_gpgme failed\n");
3042
exitcode = EX_UNAVAILABLE;
3045
gpgme_initialized = true;
3052
if(connect_to != NULL){
3053
/* Connect directly, do not use Zeroconf */
3054
/* (Mainly meant for debugging) */
3055
char *address = strrchr(connect_to, ':');
3057
if(address == NULL){
3058
fprintf_plus(stderr, "No colon in address\n");
3059
exitcode = EX_USAGE;
3069
tmpmax = strtoimax(address+1, &tmp, 10);
3070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
3071
or tmpmax != (in_port_t)tmpmax){
3072
fprintf_plus(stderr, "Bad port number\n");
3073
exitcode = EX_USAGE;
3081
port = (in_port_t)tmpmax;
3083
/* Colon in address indicates IPv6 */
3085
if(strchr(connect_to, ':') != NULL){
3087
/* Accept [] around IPv6 address - see RFC 5952 */
3088
if(connect_to[0] == '[' and address[-1] == ']')
3096
address = connect_to;
3102
while(not quit_now){
3103
ret = start_mandos_communication(address, port, if_index, af,
3105
if(quit_now or ret == 0){
3109
fprintf_plus(stderr, "Retrying in %d seconds\n",
3110
(int)retry_interval);
3112
sleep((unsigned int)retry_interval);
3116
exitcode = EXIT_SUCCESS;
3127
AvahiServerConfig config;
3128
/* Do not publish any local Zeroconf records */
3129
avahi_server_config_init(&config);
3130
config.publish_hinfo = 0;
3131
config.publish_addresses = 0;
3132
config.publish_workstation = 0;
3133
config.publish_domain = 0;
3135
/* Allocate a new server */
3136
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
3137
&config, NULL, NULL, &ret);
3139
/* Free the Avahi configuration data */
3140
avahi_server_config_free(&config);
3143
/* Check if creating the Avahi server object succeeded */
3144
if(mc.server == NULL){
3145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
3146
avahi_strerror(ret));
3147
exitcode = EX_UNAVAILABLE;
3155
/* Create the Avahi service browser */
3156
sb = avahi_s_service_browser_new(mc.server, if_index,
3157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
3158
NULL, 0, browse_callback,
3161
fprintf_plus(stderr, "Failed to create service browser: %s\n",
3162
avahi_strerror(avahi_server_errno(mc.server)));
3163
exitcode = EX_UNAVAILABLE;
3171
/* Run the main loop */
3174
fprintf_plus(stderr, "Starting Avahi loop search\n");
3177
ret = avahi_loop_with_timeout(simple_poll,
3178
(int)(retry_interval * 1000), &mc);
3180
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
3181
(ret == 0) ? "successfully" : "with error");
987
fprintf(stderr, "%s exiting\n", argv[0]);
992
avahi_s_service_browser_free(sb);
994
if (mc.server != NULL)
995
avahi_server_free(mc.server);
997
if (mc.simple_poll != NULL)
998
avahi_simple_poll_free(mc.simple_poll);
3187
if(signal_received){
3188
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
3189
argv[0], signal_received,
3190
strsignal(signal_received));
3192
fprintf_plus(stderr, "%s exiting\n", argv[0]);
3196
/* Cleanup things */
3197
free(mc.interfaces);
3200
avahi_s_service_browser_free(sb);
3202
if(mc.server != NULL)
3203
avahi_server_free(mc.server);
3205
if(simple_poll != NULL)
3206
avahi_simple_poll_free(simple_poll);
3208
if(gnutls_initialized){
3209
gnutls_certificate_free_credentials(mc.cred);
3210
gnutls_dh_params_deinit(mc.dh_params);
3213
if(gpgme_initialized){
3214
gpgme_release(mc.ctx);
3217
/* Cleans up the circular linked list of Mandos servers the client
3219
if(mc.current_server != NULL){
3220
mc.current_server->prev->next = NULL;
3221
while(mc.current_server != NULL){
3222
server *next = mc.current_server->next;
3224
#pragma GCC diagnostic push
3225
#pragma GCC diagnostic ignored "-Wcast-qual"
3227
free((char *)(mc.current_server->ip));
3229
#pragma GCC diagnostic pop
3231
free(mc.current_server);
3232
mc.current_server = next;
3236
/* Re-raise privileges */
3238
ret = raise_privileges();
3241
perror_plus("Failed to raise privileges");
3244
/* Run network hooks */
3245
run_network_hooks("stop", interfaces_hooks != NULL ?
3246
interfaces_hooks : "", delay);
3248
/* Take down the network interfaces which were brought up */
3250
char *interface = NULL;
3251
while((interface = argz_next(interfaces_to_take_down,
3252
interfaces_to_take_down_size,
3254
ret = take_down_interface(interface);
3257
perror_plus("Failed to take down interface");
3260
if(debug and (interfaces_to_take_down == NULL)){
3261
fprintf_plus(stderr, "No interfaces needed to be taken"
3267
ret = lower_privileges_permanently();
3270
perror_plus("Failed to lower privileges permanently");
3274
free(interfaces_to_take_down);
3275
free(interfaces_hooks);
3277
void clean_dir_at(int base, const char * const dirname,
3279
struct dirent **direntries = NULL;
3281
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3287
perror_plus("open");
3290
int numentries = scandirat(dir_fd, ".", &direntries,
3291
notdotentries, alphasort);
3292
if(numentries >= 0){
3293
for(int i = 0; i < numentries; i++){
3295
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3296
dirname, direntries[i]->d_name);
3298
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3300
if(errno == EISDIR){
3301
dret = unlinkat(dir_fd, direntries[i]->d_name,
3304
if((dret == -1) and (errno == ENOTEMPTY)
3305
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3306
== 0) and (level == 0)){
3307
/* Recurse only in this special case */
3308
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3311
if((dret == -1) and (errno != ENOENT)){
3312
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3313
direntries[i]->d_name, strerror(errno));
3316
free(direntries[i]);
3319
/* need to clean even if 0 because man page doesn't specify */
3321
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3322
if(dret == -1 and errno != ENOENT){
3323
perror_plus("rmdir");
3326
perror_plus("scandirat");
3331
/* Removes the GPGME temp directory and all files inside */
3332
if(tempdir != NULL){
3333
clean_dir_at(-1, tempdir, 0);
3337
sigemptyset(&old_sigterm_action.sa_mask);
3338
old_sigterm_action.sa_handler = SIG_DFL;
3339
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3340
&old_sigterm_action,
3343
perror_plus("sigaction");
3346
ret = raise(signal_received);
3347
} while(ret != 0 and errno == EINTR);
3349
perror_plus("raise");
3352
TEMP_FAILURE_RETRY(pause());