51
115
#include <avahi-common/malloc.h>
52
116
#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 */
119
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
122
init_gnutls_session(),
124
#include <gnutls/openpgp.h>
125
/* gnutls_certificate_set_openpgp_key_file(),
126
GNUTLS_OPENPGP_FMT_BASE64 */
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() */
129
#include <gpgme.h> /* All GPGME types, constants and
132
GPGME_PROTOCOL_OpenPGP,
75
135
#define BUFFER_SIZE 256
137
#define PATHDIR "/conf/conf.d/mandos"
138
#define SECKEY "seckey.txt"
139
#define PUBKEY "pubkey.txt"
140
#define HOOKDIR "/lib/mandos/network-hooks.d"
77
142
bool debug = false;
78
static const char *keydir = "/conf/conf.d/mandos";
79
143
static const char mandos_protocol_version[] = "1";
80
const char *argp_program_version = "mandosclient 0.9";
81
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
144
const char *argp_program_version = "mandos-client " VERSION;
145
const char *argp_program_bug_address = "<mandos@recompile.se>";
146
static const char sys_class_net[] = "/sys/class/net";
147
char *connect_to = NULL;
148
const char *hookdir = HOOKDIR;
153
/* Doubly linked list that need to be circularly linked when used */
154
typedef struct server{
157
AvahiIfIndex if_index;
159
struct timespec last_seen;
83
164
/* Used for passing in values through the Avahi callback functions */
85
AvahiSimplePoll *simple_poll;
86
166
AvahiServer *server;
87
167
gnutls_certificate_credentials_t cred;
88
168
unsigned int dh_bits;
89
169
gnutls_dh_params_t dh_params;
90
170
const char *priority;
172
server *current_server;
174
size_t interfaces_size;
177
/* global so signal handler can reach it*/
178
AvahiSimplePoll *simple_poll;
180
sig_atomic_t quit_now = 0;
181
int signal_received = 0;
183
/* Function to use when printing errors */
184
void perror_plus(const char *print_text){
186
fprintf(stderr, "Mandos plugin %s: ",
187
program_invocation_short_name);
192
__attribute__((format (gnu_printf, 2, 3), nonnull))
193
int fprintf_plus(FILE *stream, const char *format, ...){
195
va_start (ap, format);
197
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
198
program_invocation_short_name));
199
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
94
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
95
* "buffer_capacity" is how much is currently allocated,
203
* Make additional room in "buffer" for at least BUFFER_SIZE more
204
* bytes. "buffer_capacity" is how much is currently allocated,
96
205
* "buffer_length" is how much is already used.
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);
207
__attribute__((nonnull, warn_unused_result))
208
size_t incbuffer(char **buffer, size_t buffer_length,
209
size_t buffer_capacity){
210
if(buffer_length + BUFFER_SIZE > buffer_capacity){
211
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
int old_errno = errno;
105
220
buffer_capacity += BUFFER_SIZE;
107
222
return buffer_capacity;
225
/* Add server to set of servers to retry periodically */
226
__attribute__((nonnull, warn_unused_result))
227
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
228
int af, server **current_server){
230
server *new_server = malloc(sizeof(server));
231
if(new_server == NULL){
232
perror_plus("malloc");
235
*new_server = (server){ .ip = strdup(ip),
237
.if_index = if_index,
239
if(new_server->ip == NULL){
240
perror_plus("strdup");
244
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
246
perror_plus("clock_gettime");
248
#pragma GCC diagnostic push
249
#pragma GCC diagnostic ignored "-Wcast-qual"
251
free((char *)(new_server->ip));
253
#pragma GCC diagnostic pop
258
/* Special case of first server */
259
if(*current_server == NULL){
260
new_server->next = new_server;
261
new_server->prev = new_server;
262
*current_server = new_server;
264
/* Place the new server last in the list */
265
new_server->next = *current_server;
266
new_server->prev = (*current_server)->prev;
267
new_server->prev->next = new_server;
268
(*current_server)->prev = new_server;
111
* Decrypt OpenPGP data using keyrings in HOMEDIR.
112
* Returns -1 on error
114
static ssize_t pgp_packet_decrypt (const char *cryptotext,
117
const char *homedir){
118
gpgme_data_t dh_crypto, dh_plain;
276
__attribute__((nonnull, warn_unused_result))
277
static bool init_gpgme(const char * const seckey,
278
const char * const pubkey,
279
const char * const tempdir,
120
281
gpgme_error_t rc;
122
size_t plaintext_capacity = 0;
123
ssize_t plaintext_length = 0;
124
282
gpgme_engine_info_t engine_info;
127
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
285
* Helper function to insert pub and seckey to the engine keyring.
287
bool import_key(const char * const filename){
290
gpgme_data_t pgp_data;
292
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
298
rc = gpgme_data_new_from_fd(&pgp_data, fd);
299
if(rc != GPG_ERR_NO_ERROR){
300
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
301
gpgme_strsource(rc), gpgme_strerror(rc));
305
rc = gpgme_op_import(mc->ctx, pgp_data);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
314
perror_plus("close");
316
gpgme_data_release(pgp_data);
321
fprintf_plus(stderr, "Initializing GPGME\n");
131
325
gpgme_check_version(NULL);
132
326
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
327
if(rc != GPG_ERR_NO_ERROR){
328
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
329
gpgme_strsource(rc), gpgme_strerror(rc));
139
333
/* Set GPGME home directory for the OpenPGP engine only */
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));
334
rc = gpgme_get_engine_info(&engine_info);
335
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
337
gpgme_strsource(rc), gpgme_strerror(rc));
146
340
while(engine_info != NULL){
147
341
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
148
342
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
149
engine_info->file_name, homedir);
343
engine_info->file_name, tempdir);
152
346
engine_info = engine_info->next;
154
348
if(engine_info == NULL){
155
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
349
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
354
/* Create new GPGME "context" */
355
rc = gpgme_new(&(mc->ctx));
356
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "Mandos plugin mandos-client: "
358
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
363
if(not import_key(pubkey) or not import_key(seckey)){
371
* Decrypt OpenPGP data.
372
* Returns -1 on error
374
__attribute__((nonnull, warn_unused_result))
375
static ssize_t pgp_packet_decrypt(const char *cryptotext,
379
gpgme_data_t dh_crypto, dh_plain;
382
size_t plaintext_capacity = 0;
383
ssize_t plaintext_length = 0;
386
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
159
389
/* Create new GPGME data buffer from memory cryptotext */
160
390
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
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));
392
if(rc != GPG_ERR_NO_ERROR){
393
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
394
gpgme_strsource(rc), gpgme_strerror(rc));
168
398
/* Create new empty GPGME data buffer for the plaintext */
169
399
rc = gpgme_data_new(&dh_plain);
170
if (rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
400
if(rc != GPG_ERR_NO_ERROR){
401
fprintf_plus(stderr, "Mandos plugin mandos-client: "
402
"bad gpgme_data_new: %s: %s\n",
403
gpgme_strsource(rc), gpgme_strerror(rc));
173
404
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;
186
408
/* Decrypt data from the cryptotext data buffer to the plaintext
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));
410
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
411
if(rc != GPG_ERR_NO_ERROR){
412
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
413
gpgme_strsource(rc), gpgme_strerror(rc));
192
414
plaintext_length = -1;
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;
416
gpgme_decrypt_result_t result;
417
result = gpgme_op_decrypt_result(mc->ctx);
419
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
421
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
422
result->unsupported_algorithm);
423
fprintf_plus(stderr, "Wrong key usage: %u\n",
424
result->wrong_key_usage);
425
if(result->file_name != NULL){
426
fprintf_plus(stderr, "File name: %s\n", result->file_name);
428
gpgme_recipient_t recipient;
429
recipient = result->recipients;
216
430
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
431
fprintf_plus(stderr, "Public key algorithm: %s\n",
432
gpgme_pubkey_algo_name
433
(recipient->pubkey_algo));
434
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
435
fprintf_plus(stderr, "Secret key available: %s\n",
436
recipient->status == GPG_ERR_NO_SECKEY
223
438
recipient = recipient->next;
446
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
229
449
/* Seek back to the beginning of the GPGME plaintext data buffer */
230
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
231
perror("pgpme_data_seek");
450
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
451
perror_plus("gpgme_data_seek");
232
452
plaintext_length = -1;
233
453
goto decrypt_end;
236
456
*plaintext = NULL;
238
plaintext_capacity = adjustbuffer(plaintext,
239
(size_t)plaintext_length,
241
if (plaintext_capacity == 0){
242
perror("adjustbuffer");
243
plaintext_length = -1;
458
plaintext_capacity = incbuffer(plaintext,
459
(size_t)plaintext_length,
461
if(plaintext_capacity == 0){
462
perror_plus("incbuffer");
463
plaintext_length = -1;
247
467
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
249
469
/* Print the data, if any */
255
perror("gpgme_data_read");
475
perror_plus("gpgme_data_read");
256
476
plaintext_length = -1;
257
477
goto decrypt_end;
259
479
plaintext_length += ret;
263
fprintf(stderr, "Decrypted password is: ");
483
fprintf_plus(stderr, "Decrypted password is: ");
264
484
for(ssize_t i = 0; i < plaintext_length; i++){
265
485
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
317
540
/* OpenPGP credentials */
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));
322
gnutls_global_deinit ();
541
ret = gnutls_certificate_allocate_credentials(&mc->cred);
542
if(ret != GNUTLS_E_SUCCESS){
543
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
544
safer_gnutls_strerror(ret));
327
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
328
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
549
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
550
" secret key %s as GnuTLS credentials\n",
332
555
ret = gnutls_certificate_set_openpgp_key_file
333
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
334
if (ret != GNUTLS_E_SUCCESS) {
336
"Error[%d] while reading the OpenPGP key pair ('%s',"
337
" '%s')\n", ret, pubkeyfile, seckeyfile);
338
fprintf(stdout, "The GnuTLS error is: %s\n",
339
safer_gnutls_strerror(ret));
556
(mc->cred, pubkeyfilename, seckeyfilename,
557
GNUTLS_OPENPGP_FMT_BASE64);
558
if(ret != GNUTLS_E_SUCCESS){
560
"Error[%d] while reading the OpenPGP key pair ('%s',"
561
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
562
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
563
safer_gnutls_strerror(ret));
343
567
/* GnuTLS server initialization */
344
568
ret = gnutls_dh_params_init(&mc->dh_params);
345
if (ret != GNUTLS_E_SUCCESS) {
346
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
347
" %s\n", safer_gnutls_strerror(ret));
350
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
351
if (ret != GNUTLS_E_SUCCESS) {
352
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
353
safer_gnutls_strerror(ret));
569
if(ret != GNUTLS_E_SUCCESS){
570
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
571
" initialization: %s\n",
572
safer_gnutls_strerror(ret));
575
/* If a Diffie-Hellman parameters file was given, try to use it */
576
if(dhparamsfilename != NULL){
577
gnutls_datum_t params = { .data = NULL, .size = 0 };
579
int dhpfile = open(dhparamsfilename, O_RDONLY);
582
dhparamsfilename = NULL;
585
size_t params_capacity = 0;
587
params_capacity = incbuffer((char **)¶ms.data,
589
(size_t)params_capacity);
590
if(params_capacity == 0){
591
perror_plus("incbuffer");
594
dhparamsfilename = NULL;
597
ssize_t bytes_read = read(dhpfile,
598
params.data + params.size,
604
/* check bytes_read for failure */
609
dhparamsfilename = NULL;
612
params.size += (unsigned int)bytes_read;
614
if(params.data == NULL){
615
dhparamsfilename = NULL;
617
if(dhparamsfilename == NULL){
620
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
621
GNUTLS_X509_FMT_PEM);
622
if(ret != GNUTLS_E_SUCCESS){
623
fprintf_plus(stderr, "Failed to parse DH parameters in file"
624
" \"%s\": %s\n", dhparamsfilename,
625
safer_gnutls_strerror(ret));
626
dhparamsfilename = NULL;
630
if(dhparamsfilename == NULL){
631
if(mc->dh_bits == 0){
632
/* Find out the optimal number of DH bits */
633
/* Try to read the private key file */
634
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
636
int secfile = open(seckeyfilename, O_RDONLY);
641
size_t buffer_capacity = 0;
643
buffer_capacity = incbuffer((char **)&buffer.data,
645
(size_t)buffer_capacity);
646
if(buffer_capacity == 0){
647
perror_plus("incbuffer");
652
ssize_t bytes_read = read(secfile,
653
buffer.data + buffer.size,
659
/* check bytes_read for failure */
666
buffer.size += (unsigned int)bytes_read;
670
/* If successful, use buffer to parse private key */
671
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
672
if(buffer.data != NULL){
674
gnutls_openpgp_privkey_t privkey = NULL;
675
ret = gnutls_openpgp_privkey_init(&privkey);
676
if(ret != GNUTLS_E_SUCCESS){
677
fprintf_plus(stderr, "Error initializing OpenPGP key"
679
safer_gnutls_strerror(ret));
683
ret = gnutls_openpgp_privkey_import
684
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
685
if(ret != GNUTLS_E_SUCCESS){
686
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
687
safer_gnutls_strerror(ret));
693
/* Use private key to suggest an appropriate
695
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
696
gnutls_openpgp_privkey_deinit(privkey);
698
fprintf_plus(stderr, "This OpenPGP key implies using"
699
" a GnuTLS security parameter \"%s\".\n",
700
safe_string(gnutls_sec_param_get_name
706
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
707
/* Err on the side of caution */
708
sec_param = GNUTLS_SEC_PARAM_ULTRA;
710
fprintf_plus(stderr, "Falling back to security parameter"
712
safe_string(gnutls_sec_param_get_name
717
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
721
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
722
" implies %u DH bits; using that.\n",
723
safe_string(gnutls_sec_param_get_name
728
fprintf_plus(stderr, "Failed to get implied number of DH"
729
" bits for security parameter \"%s\"): %s\n",
730
safe_string(gnutls_sec_param_get_name
732
safer_gnutls_strerror(ret));
736
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
739
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
740
if(ret != GNUTLS_E_SUCCESS){
741
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
742
" bits): %s\n", mc->dh_bits,
743
safer_gnutls_strerror(ret));
357
747
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
363
gnutls_certificate_free_credentials (mc->cred);
364
gnutls_global_deinit ();
753
gnutls_certificate_free_credentials(mc->cred);
754
gnutls_dh_params_deinit(mc->dh_params);
369
static int init_gnutls_session(mandos_context *mc,
370
gnutls_session_t *session){
758
__attribute__((nonnull, warn_unused_result))
759
static int init_gnutls_session(gnutls_session_t *session,
372
762
/* GnuTLS session creation */
373
ret = gnutls_init(session, GNUTLS_SERVER);
374
if (ret != GNUTLS_E_SUCCESS){
375
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
376
safer_gnutls_strerror(ret));
764
ret = gnutls_init(session, GNUTLS_SERVER);
768
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
769
if(ret != GNUTLS_E_SUCCESS){
771
"Error in GnuTLS session initialization: %s\n",
772
safer_gnutls_strerror(ret));
381
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
382
if (ret != GNUTLS_E_SUCCESS) {
383
fprintf(stderr, "Syntax error at: %s\n", err);
384
fprintf(stderr, "GnuTLS error: %s\n",
385
safer_gnutls_strerror(ret));
386
gnutls_deinit (*session);
778
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
780
gnutls_deinit(*session);
783
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
784
if(ret != GNUTLS_E_SUCCESS){
785
fprintf_plus(stderr, "Syntax error at: %s\n", err);
786
fprintf_plus(stderr, "GnuTLS error: %s\n",
787
safer_gnutls_strerror(ret));
788
gnutls_deinit(*session);
391
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
393
if (ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
395
safer_gnutls_strerror(ret));
396
gnutls_deinit (*session);
794
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
797
gnutls_deinit(*session);
800
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
801
if(ret != GNUTLS_E_SUCCESS){
802
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
803
safer_gnutls_strerror(ret));
804
gnutls_deinit(*session);
400
808
/* ignore client certificate if any. */
401
gnutls_certificate_server_set_request (*session,
404
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
809
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
410
815
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
411
816
__attribute__((unused)) const char *txt){}
818
/* Set effective uid to 0, return errno */
819
__attribute__((warn_unused_result))
820
error_t raise_privileges(void){
821
error_t old_errno = errno;
822
error_t ret_errno = 0;
823
if(seteuid(0) == -1){
830
/* Set effective and real user ID to 0. Return errno. */
831
__attribute__((warn_unused_result))
832
error_t raise_privileges_permanently(void){
833
error_t old_errno = errno;
834
error_t ret_errno = raise_privileges();
846
/* Set effective user ID to unprivileged saved user ID */
847
__attribute__((warn_unused_result))
848
error_t lower_privileges(void){
849
error_t old_errno = errno;
850
error_t ret_errno = 0;
851
if(seteuid(uid) == -1){
858
/* Lower privileges permanently */
859
__attribute__((warn_unused_result))
860
error_t lower_privileges_permanently(void){
861
error_t old_errno = errno;
862
error_t ret_errno = 0;
863
if(setuid(uid) == -1){
870
/* Helper function to add_local_route() and delete_local_route() */
871
__attribute__((nonnull, warn_unused_result))
872
static bool add_delete_local_route(const bool add,
874
AvahiIfIndex if_index){
876
char helper[] = "mandos-client-iprouteadddel";
877
char add_arg[] = "add";
878
char delete_arg[] = "delete";
879
char debug_flag[] = "--debug";
880
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
881
if(pluginhelperdir == NULL){
883
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
884
" variable not set; cannot run helper\n");
889
char interface[IF_NAMESIZE];
890
if(if_indextoname((unsigned int)if_index, interface) == NULL){
891
perror_plus("if_indextoname");
895
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
897
perror_plus("open(\"/dev/null\", O_RDONLY)");
903
/* Raise privileges */
904
errno = raise_privileges_permanently();
906
perror_plus("Failed to raise privileges");
907
/* _exit(EX_NOPERM); */
913
perror_plus("setgid");
916
/* Reset supplementary groups */
918
ret = setgroups(0, NULL);
920
perror_plus("setgroups");
924
ret = dup2(devnull, STDIN_FILENO);
926
perror_plus("dup2(devnull, STDIN_FILENO)");
929
ret = close(devnull);
931
perror_plus("close");
934
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
936
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
939
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
944
if(helperdir_fd == -1){
946
_exit(EX_UNAVAILABLE);
948
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
951
perror_plus("openat");
953
_exit(EX_UNAVAILABLE);
957
#pragma GCC diagnostic push
958
#pragma GCC diagnostic ignored "-Wcast-qual"
960
if(fexecve(helper_fd, (char *const [])
961
{ helper, add ? add_arg : delete_arg, (char *)address,
962
interface, debug ? debug_flag : NULL, NULL },
965
#pragma GCC diagnostic pop
967
perror_plus("fexecve");
979
pret = waitpid(pid, &status, 0);
980
if(pret == -1 and errno == EINTR and quit_now){
981
int errno_raising = 0;
982
if((errno = raise_privileges()) != 0){
983
errno_raising = errno;
984
perror_plus("Failed to raise privileges in order to"
985
" kill helper program");
987
if(kill(pid, SIGTERM) == -1){
990
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
991
perror_plus("Failed to lower privileges after killing"
996
} while(pret == -1 and errno == EINTR);
998
perror_plus("waitpid");
1001
if(WIFEXITED(status)){
1002
if(WEXITSTATUS(status) != 0){
1003
fprintf_plus(stderr, "Error: iprouteadddel exited"
1004
" with status %d\n", WEXITSTATUS(status));
1009
if(WIFSIGNALED(status)){
1010
fprintf_plus(stderr, "Error: iprouteadddel died by"
1011
" signal %d\n", WTERMSIG(status));
1014
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1018
__attribute__((nonnull, warn_unused_result))
1019
static bool add_local_route(const char *address,
1020
AvahiIfIndex if_index){
1022
fprintf_plus(stderr, "Adding route to %s\n", address);
1024
return add_delete_local_route(true, address, if_index);
1027
__attribute__((nonnull, warn_unused_result))
1028
static bool delete_local_route(const char *address,
1029
AvahiIfIndex if_index){
1031
fprintf_plus(stderr, "Removing route to %s\n", address);
1033
return add_delete_local_route(false, address, if_index);
413
1036
/* Called when a Mandos server is found */
414
static int start_mandos_communication(const char *ip, uint16_t port,
1037
__attribute__((nonnull, warn_unused_result))
1038
static int start_mandos_communication(const char *ip, in_port_t port,
415
1039
AvahiIfIndex if_index,
418
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
1040
int af, mandos_context *mc){
1041
int ret, tcp_sd = -1;
1043
struct sockaddr_storage to;
419
1044
char *buffer = NULL;
420
char *decrypted_buffer;
1045
char *decrypted_buffer = NULL;
421
1046
size_t buffer_length = 0;
422
1047
size_t buffer_capacity = 0;
423
ssize_t decrypted_buffer_size;
426
char interface[IF_NAMESIZE];
427
1050
gnutls_session_t session;
429
ret = init_gnutls_session (mc, &session);
435
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
439
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
446
if(if_indextoname((unsigned int)if_index, interface) == NULL){
447
perror("if_indextoname");
1051
int pf; /* Protocol family */
1052
bool route_added = false;
1069
fprintf_plus(stderr, "Bad address family: %d\n", af);
1074
/* If the interface is specified and we have a list of interfaces */
1075
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1076
/* Check if the interface is one of the interfaces we are using */
1079
char *interface = NULL;
1080
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1082
if(if_nametoindex(interface) == (unsigned int)if_index){
1089
/* This interface does not match any in the list, so we don't
1090
connect to the server */
1092
char interface[IF_NAMESIZE];
1093
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1094
perror_plus("if_indextoname");
1096
fprintf_plus(stderr, "Skipping server on non-used interface"
1098
if_indextoname((unsigned int)if_index,
450
fprintf(stderr, "Binding to interface %s\n", interface);
453
memset(&to,0,sizeof(to)); /* Spurious warning */
454
to.in6.sin6_family = AF_INET6;
455
/* It would be nice to have a way to detect if we were passed an
456
IPv4 address here. Now we assume an IPv6 address. */
457
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
1106
ret = init_gnutls_session(&session, mc);
1112
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1113
PRIuMAX "\n", ip, (uintmax_t)port);
1116
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1119
perror_plus("socket");
1130
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1131
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1132
ret = inet_pton(af, ip, &to6->sin6_addr);
1134
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1135
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1136
ret = inet_pton(af, ip, &to4->sin_addr);
1140
perror_plus("inet_pton");
463
fprintf(stderr, "Bad address: %s\n", ip);
466
to.in6.sin6_port = htons(port); /* Spurious warning */
1146
fprintf_plus(stderr, "Bad address: %s\n", ip);
1151
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1152
if(IN6_IS_ADDR_LINKLOCAL
1153
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1154
if(if_index == AVAHI_IF_UNSPEC){
1155
fprintf_plus(stderr, "An IPv6 link-local address is"
1156
" incomplete without a network interface\n");
1160
/* Set the network interface number as scope */
1161
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1164
((struct sockaddr_in *)&to)->sin_port = htons(port);
468
to.in6.sin6_scope_id = (uint32_t)if_index;
471
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
472
char addrstr[INET6_ADDRSTRLEN] = "";
473
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
474
sizeof(addrstr)) == NULL){
477
if(strcmp(addrstr, ip) != 0){
478
fprintf(stderr, "Canonical address form: %s\n", addrstr);
483
ret = connect(tcp_sd, &to.in, sizeof(to));
1173
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1174
char interface[IF_NAMESIZE];
1175
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1176
perror_plus("if_indextoname");
1178
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1179
"\n", ip, interface, (uintmax_t)port);
1182
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1183
ip, (uintmax_t)port);
1185
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1186
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1188
ret = getnameinfo((struct sockaddr *)&to,
1189
sizeof(struct sockaddr_in6),
1190
addrstr, sizeof(addrstr), NULL, 0,
1193
ret = getnameinfo((struct sockaddr *)&to,
1194
sizeof(struct sockaddr_in),
1195
addrstr, sizeof(addrstr), NULL, 0,
1198
if(ret == EAI_SYSTEM){
1199
perror_plus("getnameinfo");
1200
} else if(ret != 0) {
1201
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1202
} else if(strcmp(addrstr, ip) != 0){
1203
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1214
ret = connect(tcp_sd, (struct sockaddr *)&to,
1215
sizeof(struct sockaddr_in6));
1217
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1218
sizeof(struct sockaddr_in));
1221
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1222
and if_index != AVAHI_IF_UNSPEC
1223
and connect_to == NULL
1224
and not route_added and
1225
((af == AF_INET6 and not
1226
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1228
or (af == AF_INET and
1229
/* Not a a IPv4LL address */
1230
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1231
& 0xFFFF0000L) != 0xA9FE0000L))){
1232
/* Work around Avahi bug - Avahi does not announce link-local
1233
addresses if it has a global address, so local hosts with
1234
*only* a link-local address (e.g. Mandos clients) cannot
1235
connect to a Mandos server announced by Avahi on a server
1236
host with a global address. Work around this by retrying
1237
with an explicit route added with the server's address.
1239
Avahi bug reference:
1240
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1241
https://bugs.debian.org/587961
1244
fprintf_plus(stderr, "Mandos server unreachable, trying"
1248
route_added = add_local_route(ip, if_index);
1254
if(errno != ECONNREFUSED or debug){
1256
perror_plus("connect");
489
1269
const char *out = mandos_protocol_version;
492
1272
size_t out_size = strlen(out);
493
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
494
out_size - written));
1273
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1274
out_size - written));
1277
perror_plus("write");
498
1279
goto mandos_end;
500
1281
written += (size_t)ret;
501
1282
if(written < out_size){
504
if (out == mandos_protocol_version){
1285
if(out == mandos_protocol_version){
514
fprintf(stderr, "Establishing TLS session with %s\n", ip);
517
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
519
ret = gnutls_handshake (session);
521
if (ret != GNUTLS_E_SUCCESS){
1300
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1308
/* This casting via intptr_t is to eliminate warning about casting
1309
an int to a pointer type. This is exactly how the GnuTLS Guile
1310
function "set-session-transport-fd!" does it. */
1311
gnutls_transport_set_ptr(session,
1312
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1320
ret = gnutls_handshake(session);
1325
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1327
if(ret != GNUTLS_E_SUCCESS){
523
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1329
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
527
1333
goto mandos_end;
530
1336
/* Read OpenPGP packet that contains the wanted password */
533
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1339
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
538
buffer_capacity = adjustbuffer(&buffer, buffer_length,
540
if (buffer_capacity == 0){
541
perror("adjustbuffer");
546
ret = gnutls_record_recv(session, buffer+buffer_length,
1350
buffer_capacity = incbuffer(&buffer, buffer_length,
1352
if(buffer_capacity == 0){
1354
perror_plus("incbuffer");
1364
sret = gnutls_record_recv(session, buffer+buffer_length,
553
1371
case GNUTLS_E_INTERRUPTED:
554
1372
case GNUTLS_E_AGAIN:
556
1374
case GNUTLS_E_REHANDSHAKE:
557
ret = gnutls_handshake (session);
559
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1376
ret = gnutls_handshake(session);
1382
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1384
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
562
1388
goto mandos_end;
566
fprintf(stderr, "Unknown error while reading data from"
567
" encrypted session with Mandos server\n");
569
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1392
fprintf_plus(stderr, "Unknown error while reading data from"
1393
" encrypted session with Mandos server\n");
1394
gnutls_bye(session, GNUTLS_SHUT_RDWR);
570
1396
goto mandos_end;
573
buffer_length += (size_t) ret;
1399
buffer_length += (size_t) sret;
578
fprintf(stderr, "Closing TLS session\n");
581
gnutls_bye (session, GNUTLS_SHUT_RDWR);
583
if (buffer_length > 0){
584
decrypted_buffer_size = pgp_packet_decrypt(buffer,
588
if (decrypted_buffer_size >= 0){
1404
fprintf_plus(stderr, "Closing TLS session\n");
1413
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1418
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1420
if(buffer_length > 0){
1421
ssize_t decrypted_buffer_size;
1422
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1423
&decrypted_buffer, mc);
1424
if(decrypted_buffer_size >= 0){
590
1427
while(written < (size_t) decrypted_buffer_size){
591
ret = (int)fwrite (decrypted_buffer + written, 1,
592
(size_t)decrypted_buffer_size - written,
1433
ret = (int)fwrite(decrypted_buffer + written, 1,
1434
(size_t)decrypted_buffer_size - written,
594
1436
if(ret == 0 and ferror(stdout)){
596
fprintf(stderr, "Error writing encrypted data: %s\n",
1439
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
602
1445
written += (size_t)ret;
604
free(decrypted_buffer);
610
1451
/* Shutdown procedure */
615
gnutls_deinit (session);
1456
if(not delete_local_route(ip, if_index)){
1457
fprintf_plus(stderr, "Failed to delete local route to %s on"
1458
" interface %d", ip, if_index);
1462
free(decrypted_buffer);
1465
ret = close(tcp_sd);
1471
perror_plus("close");
1473
gnutls_deinit(session);
1483
__attribute__((nonnull))
619
1484
static void resolve_callback(AvahiSServiceResolver *r,
620
1485
AvahiIfIndex interface,
621
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1486
AvahiProtocol proto,
622
1487
AvahiResolverEvent event,
623
1488
const char *name,
624
1489
const char *type,
706
1598
case AVAHI_BROWSER_ALL_FOR_NOW:
707
1599
case AVAHI_BROWSER_CACHE_EXHAUSTED:
709
fprintf(stderr, "No Mandos server found, still searching...\n");
1601
fprintf_plus(stderr, "No Mandos server found, still"
715
/* Combines file name and path and returns the malloced new
716
string. some sane checks could/should be added */
717
static const char *combinepath(const char *first, const char *second){
718
size_t f_len = strlen(first);
719
size_t s_len = strlen(second);
720
char *tmp = malloc(f_len + s_len + 2);
725
memcpy(tmp, first, f_len); /* Spurious warning */
729
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
731
tmp[f_len + 1 + s_len] = '\0';
1608
/* Signal handler that stops main loop after SIGTERM */
1609
static void handle_sigterm(int sig){
1614
signal_received = sig;
1615
int old_errno = errno;
1616
/* set main loop to exit */
1617
if(simple_poll != NULL){
1618
avahi_simple_poll_quit(simple_poll);
1623
__attribute__((nonnull, warn_unused_result))
1624
bool get_flags(const char *ifname, struct ifreq *ifr){
1628
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1631
perror_plus("socket");
1635
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1636
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1637
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1641
perror_plus("ioctl SIOCGIFFLAGS");
1649
__attribute__((nonnull, warn_unused_result))
1650
bool good_flags(const char *ifname, const struct ifreq *ifr){
1652
/* Reject the loopback device */
1653
if(ifr->ifr_flags & IFF_LOOPBACK){
1655
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1660
/* Accept point-to-point devices only if connect_to is specified */
1661
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1663
fprintf_plus(stderr, "Accepting point-to-point interface"
1664
" \"%s\"\n", ifname);
1668
/* Otherwise, reject non-broadcast-capable devices */
1669
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1671
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1672
" \"%s\"\n", ifname);
1676
/* Reject non-ARP interfaces (including dummy interfaces) */
1677
if(ifr->ifr_flags & IFF_NOARP){
1679
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1685
/* Accept this device */
1687
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1693
* This function determines if a directory entry in /sys/class/net
1694
* corresponds to an acceptable network device.
1695
* (This function is passed to scandir(3) as a filter function.)
1697
__attribute__((nonnull, warn_unused_result))
1698
int good_interface(const struct dirent *if_entry){
1699
if(if_entry->d_name[0] == '.'){
1704
if(not get_flags(if_entry->d_name, &ifr)){
1706
fprintf_plus(stderr, "Failed to get flags for interface "
1707
"\"%s\"\n", if_entry->d_name);
1712
if(not good_flags(if_entry->d_name, &ifr)){
1719
* This function determines if a network interface is up.
1721
__attribute__((nonnull, warn_unused_result))
1722
bool interface_is_up(const char *interface){
1724
if(not get_flags(interface, &ifr)){
1726
fprintf_plus(stderr, "Failed to get flags for interface "
1727
"\"%s\"\n", interface);
1732
return (bool)(ifr.ifr_flags & IFF_UP);
1736
* This function determines if a network interface is running
1738
__attribute__((nonnull, warn_unused_result))
1739
bool interface_is_running(const char *interface){
1741
if(not get_flags(interface, &ifr)){
1743
fprintf_plus(stderr, "Failed to get flags for interface "
1744
"\"%s\"\n", interface);
1749
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1752
__attribute__((nonnull, pure, warn_unused_result))
1753
int notdotentries(const struct dirent *direntry){
1754
/* Skip "." and ".." */
1755
if(direntry->d_name[0] == '.'
1756
and (direntry->d_name[1] == '\0'
1757
or (direntry->d_name[1] == '.'
1758
and direntry->d_name[2] == '\0'))){
1764
/* Is this directory entry a runnable program? */
1765
__attribute__((nonnull, warn_unused_result))
1766
int runnable_hook(const struct dirent *direntry){
1771
if((direntry->d_name)[0] == '\0'){
1776
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1777
"abcdefghijklmnopqrstuvwxyz"
1780
if((direntry->d_name)[sret] != '\0'){
1781
/* Contains non-allowed characters */
1783
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1789
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1792
perror_plus("Could not stat hook");
1796
if(not (S_ISREG(st.st_mode))){
1797
/* Not a regular file */
1799
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1804
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1805
/* Not executable */
1807
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1813
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1819
__attribute__((nonnull, warn_unused_result))
1820
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1821
mandos_context *mc){
1823
struct timespec now;
1824
struct timespec waited_time;
1825
intmax_t block_time;
1828
if(mc->current_server == NULL){
1830
fprintf_plus(stderr, "Wait until first server is found."
1833
ret = avahi_simple_poll_iterate(s, -1);
1836
fprintf_plus(stderr, "Check current_server if we should run"
1839
/* the current time */
1840
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1842
perror_plus("clock_gettime");
1845
/* Calculating in ms how long time between now and server
1846
who we visted longest time ago. Now - last seen. */
1847
waited_time.tv_sec = (now.tv_sec
1848
- mc->current_server->last_seen.tv_sec);
1849
waited_time.tv_nsec = (now.tv_nsec
1850
- mc->current_server->last_seen.tv_nsec);
1851
/* total time is 10s/10,000ms.
1852
Converting to s from ms by dividing by 1,000,
1853
and ns to ms by dividing by 1,000,000. */
1854
block_time = ((retry_interval
1855
- ((intmax_t)waited_time.tv_sec * 1000))
1856
- ((intmax_t)waited_time.tv_nsec / 1000000));
1859
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1863
if(block_time <= 0){
1864
ret = start_mandos_communication(mc->current_server->ip,
1865
mc->current_server->port,
1866
mc->current_server->if_index,
1867
mc->current_server->af, mc);
1869
avahi_simple_poll_quit(s);
1872
ret = clock_gettime(CLOCK_MONOTONIC,
1873
&mc->current_server->last_seen);
1875
perror_plus("clock_gettime");
1878
mc->current_server = mc->current_server->next;
1879
block_time = 0; /* Call avahi to find new Mandos
1880
servers, but don't block */
1883
ret = avahi_simple_poll_iterate(s, (int)block_time);
1886
if(ret > 0 or errno != EINTR){
1887
return (ret != 1) ? ret : 0;
1893
__attribute__((nonnull))
1894
void run_network_hooks(const char *mode, const char *interface,
1896
struct dirent **direntries = NULL;
1897
if(hookdir_fd == -1){
1898
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1900
if(hookdir_fd == -1){
1901
if(errno == ENOENT){
1903
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1904
" found\n", hookdir);
1907
perror_plus("open");
1912
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1913
runnable_hook, alphasort);
1915
perror_plus("scandir");
1918
struct dirent *direntry;
1920
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1922
perror_plus("open(\"/dev/null\", O_RDONLY)");
1925
for(int i = 0; i < numhooks; i++){
1926
direntry = direntries[i];
1928
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1931
pid_t hook_pid = fork();
1934
/* Raise privileges */
1935
errno = raise_privileges_permanently();
1937
perror_plus("Failed to raise privileges");
1944
perror_plus("setgid");
1947
/* Reset supplementary groups */
1949
ret = setgroups(0, NULL);
1951
perror_plus("setgroups");
1954
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1956
perror_plus("setenv");
1959
ret = setenv("DEVICE", interface, 1);
1961
perror_plus("setenv");
1964
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1966
perror_plus("setenv");
1969
ret = setenv("MODE", mode, 1);
1971
perror_plus("setenv");
1975
ret = asprintf(&delaystring, "%f", (double)delay);
1977
perror_plus("asprintf");
1980
ret = setenv("DELAY", delaystring, 1);
1983
perror_plus("setenv");
1987
if(connect_to != NULL){
1988
ret = setenv("CONNECT", connect_to, 1);
1990
perror_plus("setenv");
1994
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1998
perror_plus("openat");
1999
_exit(EXIT_FAILURE);
2001
if(close(hookdir_fd) == -1){
2002
perror_plus("close");
2003
_exit(EXIT_FAILURE);
2005
ret = dup2(devnull, STDIN_FILENO);
2007
perror_plus("dup2(devnull, STDIN_FILENO)");
2010
ret = close(devnull);
2012
perror_plus("close");
2015
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2017
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2020
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2022
perror_plus("fexecve");
2023
_exit(EXIT_FAILURE);
2027
perror_plus("fork");
2032
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2033
perror_plus("waitpid");
2037
if(WIFEXITED(status)){
2038
if(WEXITSTATUS(status) != 0){
2039
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2040
" with status %d\n", direntry->d_name,
2041
WEXITSTATUS(status));
2045
} else if(WIFSIGNALED(status)){
2046
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2047
" signal %d\n", direntry->d_name,
2052
fprintf_plus(stderr, "Warning: network hook \"%s\""
2053
" crashed\n", direntry->d_name);
2059
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2065
if(close(hookdir_fd) == -1){
2066
perror_plus("close");
2073
__attribute__((nonnull, warn_unused_result))
2074
error_t bring_up_interface(const char *const interface,
2076
error_t old_errno = errno;
2078
struct ifreq network;
2079
unsigned int if_index = if_nametoindex(interface);
2081
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2091
if(not interface_is_up(interface)){
2092
error_t ret_errno = 0, ioctl_errno = 0;
2093
if(not get_flags(interface, &network)){
2095
fprintf_plus(stderr, "Failed to get flags for interface "
2096
"\"%s\"\n", interface);
2100
network.ifr_flags |= IFF_UP; /* set flag */
2102
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2105
perror_plus("socket");
2113
perror_plus("close");
2120
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2124
/* Raise privileges */
2125
ret_errno = raise_privileges();
2128
perror_plus("Failed to raise privileges");
2133
bool restore_loglevel = false;
2135
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2136
messages about the network interface to mess up the prompt */
2137
ret_linux = klogctl(8, NULL, 5);
2138
if(ret_linux == -1){
2139
perror_plus("klogctl");
2141
restore_loglevel = true;
2144
#endif /* __linux__ */
2145
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2146
ioctl_errno = errno;
2148
if(restore_loglevel){
2149
ret_linux = klogctl(7, NULL, 0);
2150
if(ret_linux == -1){
2151
perror_plus("klogctl");
2154
#endif /* __linux__ */
2156
/* If raise_privileges() succeeded above */
2158
/* Lower privileges */
2159
ret_errno = lower_privileges();
2162
perror_plus("Failed to lower privileges");
2166
/* Close the socket */
2169
perror_plus("close");
2172
if(ret_setflags == -1){
2173
errno = ioctl_errno;
2174
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2179
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2183
/* Sleep checking until interface is running.
2184
Check every 0.25s, up to total time of delay */
2185
for(int i=0; i < delay * 4; i++){
2186
if(interface_is_running(interface)){
2189
struct timespec sleeptime = { .tv_nsec = 250000000 };
2190
ret = nanosleep(&sleeptime, NULL);
2191
if(ret == -1 and errno != EINTR){
2192
perror_plus("nanosleep");
2200
__attribute__((nonnull, warn_unused_result))
2201
error_t take_down_interface(const char *const interface){
2202
error_t old_errno = errno;
2203
struct ifreq network;
2204
unsigned int if_index = if_nametoindex(interface);
2206
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2210
if(interface_is_up(interface)){
2211
error_t ret_errno = 0, ioctl_errno = 0;
2212
if(not get_flags(interface, &network) and debug){
2214
fprintf_plus(stderr, "Failed to get flags for interface "
2215
"\"%s\"\n", interface);
2219
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2221
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2224
perror_plus("socket");
2230
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2234
/* Raise privileges */
2235
ret_errno = raise_privileges();
2238
perror_plus("Failed to raise privileges");
2241
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2242
ioctl_errno = errno;
2244
/* If raise_privileges() succeeded above */
2246
/* Lower privileges */
2247
ret_errno = lower_privileges();
2250
perror_plus("Failed to lower privileges");
2254
/* Close the socket */
2255
int ret = close(sd);
2257
perror_plus("close");
2260
if(ret_setflags == -1){
2261
errno = ioctl_errno;
2262
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2267
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
736
2275
int main(int argc, char *argv[]){
737
AvahiSServiceBrowser *sb = NULL;
740
int exitcode = EXIT_SUCCESS;
741
const char *interface = "eth0";
742
struct ifreq network;
746
char *connect_to = NULL;
747
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
748
const char *pubkeyfile = "pubkey.txt";
749
const char *seckeyfile = "seckey.txt";
750
mandos_context mc = { .simple_poll = NULL, .server = NULL,
751
.dh_bits = 1024, .priority = "SECURE256"};
752
bool gnutls_initalized = false;
755
struct argp_option options[] = {
756
{ .name = "debug", .key = 128,
757
.doc = "Debug mode", .group = 3 },
758
{ .name = "connect", .key = 'c',
760
.doc = "Connect directly to a sepcified mandos server",
762
{ .name = "interface", .key = 'i',
764
.doc = "Interface that Avahi will conntect through",
766
{ .name = "keydir", .key = 'd',
768
.doc = "Directory where the openpgp keyring is",
770
{ .name = "seckey", .key = 's',
772
.doc = "Secret openpgp key for gnutls authentication",
774
{ .name = "pubkey", .key = 'p',
776
.doc = "Public openpgp key for gnutls authentication",
778
{ .name = "dh-bits", .key = 129,
780
.doc = "dh-bits to use in gnutls communication",
782
{ .name = "priority", .key = 130,
784
.doc = "GNUTLS priority", .group = 1 },
789
error_t parse_opt (int key, char *arg,
790
struct argp_state *state) {
791
/* Get the INPUT argument from `argp_parse', which we know is
792
a pointer to our plugin list pointer. */
814
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
829
return ARGP_ERR_UNKNOWN;
834
struct argp argp = { .options = options, .parser = parse_opt,
836
.doc = "Mandos client -- Get and decrypt"
837
" passwords from mandos server" };
838
argp_parse (&argp, argc, argv, 0, 0, NULL);
841
pubkeyfile = combinepath(keydir, pubkeyfile);
842
if (pubkeyfile == NULL){
843
perror("combinepath");
2276
mandos_context mc = { .server = NULL, .dh_bits = 0,
2277
.priority = "SECURE256:!CTYPE-X.509"
2278
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2279
.current_server = NULL, .interfaces = NULL,
2280
.interfaces_size = 0 };
2281
AvahiSServiceBrowser *sb = NULL;
2286
int exitcode = EXIT_SUCCESS;
2287
char *interfaces_to_take_down = NULL;
2288
size_t interfaces_to_take_down_size = 0;
2289
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2290
char old_tempdir[] = "/tmp/mandosXXXXXX";
2291
char *tempdir = NULL;
2292
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2293
const char *seckey = PATHDIR "/" SECKEY;
2294
const char *pubkey = PATHDIR "/" PUBKEY;
2295
const char *dh_params_file = NULL;
2296
char *interfaces_hooks = NULL;
2298
bool gnutls_initialized = false;
2299
bool gpgme_initialized = false;
2301
double retry_interval = 10; /* 10s between trying a server and
2302
retrying the same server again */
2304
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2305
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2310
/* Lower any group privileges we might have, just to be safe */
2314
perror_plus("setgid");
2317
/* Lower user privileges (temporarily) */
2321
perror_plus("seteuid");
2329
struct argp_option options[] = {
2330
{ .name = "debug", .key = 128,
2331
.doc = "Debug mode", .group = 3 },
2332
{ .name = "connect", .key = 'c',
2333
.arg = "ADDRESS:PORT",
2334
.doc = "Connect directly to a specific Mandos server",
2336
{ .name = "interface", .key = 'i',
2338
.doc = "Network interface that will be used to search for"
2341
{ .name = "seckey", .key = 's',
2343
.doc = "OpenPGP secret key file base name",
2345
{ .name = "pubkey", .key = 'p',
2347
.doc = "OpenPGP public key file base name",
2349
{ .name = "dh-bits", .key = 129,
2351
.doc = "Bit length of the prime number used in the"
2352
" Diffie-Hellman key exchange",
2354
{ .name = "dh-params", .key = 134,
2356
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2357
" for the Diffie-Hellman key exchange",
2359
{ .name = "priority", .key = 130,
2361
.doc = "GnuTLS priority string for the TLS handshake",
2363
{ .name = "delay", .key = 131,
2365
.doc = "Maximum delay to wait for interface startup",
2367
{ .name = "retry", .key = 132,
2369
.doc = "Retry interval used when denied by the Mandos server",
2371
{ .name = "network-hook-dir", .key = 133,
2373
.doc = "Directory where network hooks are located",
2376
* These reproduce what we would get without ARGP_NO_HELP
2378
{ .name = "help", .key = '?',
2379
.doc = "Give this help list", .group = -1 },
2380
{ .name = "usage", .key = -3,
2381
.doc = "Give a short usage message", .group = -1 },
2382
{ .name = "version", .key = 'V',
2383
.doc = "Print program version", .group = -1 },
2387
error_t parse_opt(int key, char *arg,
2388
struct argp_state *state){
2391
case 128: /* --debug */
2394
case 'c': /* --connect */
2397
case 'i': /* --interface */
2398
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2401
argp_error(state, "%s", strerror(ret_errno));
2404
case 's': /* --seckey */
2407
case 'p': /* --pubkey */
2410
case 129: /* --dh-bits */
2412
tmpmax = strtoimax(arg, &tmp, 10);
2413
if(errno != 0 or tmp == arg or *tmp != '\0'
2414
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2415
argp_error(state, "Bad number of DH bits");
2417
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2419
case 134: /* --dh-params */
2420
dh_params_file = arg;
2422
case 130: /* --priority */
2425
case 131: /* --delay */
2427
delay = strtof(arg, &tmp);
2428
if(errno != 0 or tmp == arg or *tmp != '\0'){
2429
argp_error(state, "Bad delay");
2431
case 132: /* --retry */
2433
retry_interval = strtod(arg, &tmp);
2434
if(errno != 0 or tmp == arg or *tmp != '\0'
2435
or (retry_interval * 1000) > INT_MAX
2436
or retry_interval < 0){
2437
argp_error(state, "Bad retry interval");
2440
case 133: /* --network-hook-dir */
2444
* These reproduce what we would get without ARGP_NO_HELP
2446
case '?': /* --help */
2447
argp_state_help(state, state->out_stream,
2448
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2449
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2450
case -3: /* --usage */
2451
argp_state_help(state, state->out_stream,
2452
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2453
case 'V': /* --version */
2454
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2455
exit(argp_err_exit_status);
2458
return ARGP_ERR_UNKNOWN;
2463
struct argp argp = { .options = options, .parser = parse_opt,
2465
.doc = "Mandos client -- Get and decrypt"
2466
" passwords from a Mandos server" };
2467
ret = argp_parse(&argp, argc, argv,
2468
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2475
perror_plus("argp_parse");
2476
exitcode = EX_OSERR;
2479
exitcode = EX_USAGE;
2485
/* Work around Debian bug #633582:
2486
<http://bugs.debian.org/633582> */
2488
/* Re-raise privileges */
2489
ret_errno = raise_privileges();
2492
perror_plus("Failed to raise privileges");
2496
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2497
int seckey_fd = open(seckey, O_RDONLY);
2498
if(seckey_fd == -1){
2499
perror_plus("open");
2501
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2503
perror_plus("fstat");
2505
if(S_ISREG(st.st_mode)
2506
and st.st_uid == 0 and st.st_gid == 0){
2507
ret = fchown(seckey_fd, uid, gid);
2509
perror_plus("fchown");
2517
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2518
int pubkey_fd = open(pubkey, O_RDONLY);
2519
if(pubkey_fd == -1){
2520
perror_plus("open");
2522
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2524
perror_plus("fstat");
2526
if(S_ISREG(st.st_mode)
2527
and st.st_uid == 0 and st.st_gid == 0){
2528
ret = fchown(pubkey_fd, uid, gid);
2530
perror_plus("fchown");
2538
if(dh_params_file != NULL
2539
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2540
int dhparams_fd = open(dh_params_file, O_RDONLY);
2541
if(dhparams_fd == -1){
2542
perror_plus("open");
2544
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2546
perror_plus("fstat");
2548
if(S_ISREG(st.st_mode)
2549
and st.st_uid == 0 and st.st_gid == 0){
2550
ret = fchown(dhparams_fd, uid, gid);
2552
perror_plus("fchown");
2560
/* Lower privileges */
2561
ret_errno = lower_privileges();
2564
perror_plus("Failed to lower privileges");
2569
/* Remove invalid interface names (except "none") */
2571
char *interface = NULL;
2572
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2574
if(strcmp(interface, "none") != 0
2575
and if_nametoindex(interface) == 0){
2576
if(interface[0] != '\0'){
2577
fprintf_plus(stderr, "Not using nonexisting interface"
2578
" \"%s\"\n", interface);
2580
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2586
/* Run network hooks */
2588
if(mc.interfaces != NULL){
2589
interfaces_hooks = malloc(mc.interfaces_size);
2590
if(interfaces_hooks == NULL){
2591
perror_plus("malloc");
2594
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2595
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2597
run_network_hooks("start", interfaces_hooks != NULL ?
2598
interfaces_hooks : "", delay);
2602
avahi_set_log_function(empty_log);
2605
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2606
from the signal handler */
2607
/* Initialize the pseudo-RNG for Avahi */
2608
srand((unsigned int) time(NULL));
2609
simple_poll = avahi_simple_poll_new();
2610
if(simple_poll == NULL){
2611
fprintf_plus(stderr,
2612
"Avahi: Failed to create simple poll object.\n");
2613
exitcode = EX_UNAVAILABLE;
2617
sigemptyset(&sigterm_action.sa_mask);
2618
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2620
perror_plus("sigaddset");
2621
exitcode = EX_OSERR;
2624
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2626
perror_plus("sigaddset");
2627
exitcode = EX_OSERR;
2630
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2632
perror_plus("sigaddset");
2633
exitcode = EX_OSERR;
2636
/* Need to check if the handler is SIG_IGN before handling:
2637
| [[info:libc:Initial Signal Actions]] |
2638
| [[info:libc:Basic Signal Handling]] |
2640
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2642
perror_plus("sigaction");
2645
if(old_sigterm_action.sa_handler != SIG_IGN){
2646
ret = sigaction(SIGINT, &sigterm_action, NULL);
2648
perror_plus("sigaction");
2649
exitcode = EX_OSERR;
2653
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2655
perror_plus("sigaction");
2658
if(old_sigterm_action.sa_handler != SIG_IGN){
2659
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2661
perror_plus("sigaction");
2662
exitcode = EX_OSERR;
2666
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2668
perror_plus("sigaction");
2671
if(old_sigterm_action.sa_handler != SIG_IGN){
2672
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2674
perror_plus("sigaction");
2675
exitcode = EX_OSERR;
2680
/* If no interfaces were specified, make a list */
2681
if(mc.interfaces == NULL){
2682
struct dirent **direntries = NULL;
2683
/* Look for any good interfaces */
2684
ret = scandir(sys_class_net, &direntries, good_interface,
2687
/* Add all found interfaces to interfaces list */
2688
for(int i = 0; i < ret; ++i){
2689
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2690
direntries[i]->d_name);
2693
perror_plus("argz_add");
2694
free(direntries[i]);
2698
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2699
direntries[i]->d_name);
2701
free(direntries[i]);
2708
fprintf_plus(stderr, "Could not find a network interface\n");
844
2709
exitcode = EXIT_FAILURE;
848
seckeyfile = combinepath(keydir, seckeyfile);
849
if (seckeyfile == NULL){
850
perror("combinepath");
854
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
856
fprintf(stderr, "init_gnutls_global\n");
2714
/* Bring up interfaces which are down, and remove any "none"s */
2716
char *interface = NULL;
2717
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2719
/* If interface name is "none", stop bringing up interfaces.
2720
Also remove all instances of "none" from the list */
2721
if(strcmp(interface, "none") == 0){
2722
argz_delete(&mc.interfaces, &mc.interfaces_size,
2725
while((interface = argz_next(mc.interfaces,
2726
mc.interfaces_size, interface))){
2727
if(strcmp(interface, "none") == 0){
2728
argz_delete(&mc.interfaces, &mc.interfaces_size,
2735
bool interface_was_up = interface_is_up(interface);
2736
errno = bring_up_interface(interface, delay);
2737
if(not interface_was_up){
2739
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2740
" %s\n", interface, strerror(errno));
2742
errno = argz_add(&interfaces_to_take_down,
2743
&interfaces_to_take_down_size,
2746
perror_plus("argz_add");
2751
if(debug and (interfaces_to_take_down == NULL)){
2752
fprintf_plus(stderr, "No interfaces were brought up\n");
2756
/* If we only got one interface, explicitly use only that one */
2757
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2759
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2762
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2769
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2771
fprintf_plus(stderr, "init_gnutls_global failed\n");
2772
exitcode = EX_UNAVAILABLE;
2775
gnutls_initialized = true;
2782
/* Try /run/tmp before /tmp */
2783
tempdir = mkdtemp(run_tempdir);
2784
if(tempdir == NULL and errno == ENOENT){
2786
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2787
run_tempdir, old_tempdir);
2789
tempdir = mkdtemp(old_tempdir);
2791
if(tempdir == NULL){
2792
perror_plus("mkdtemp");
2800
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2801
fprintf_plus(stderr, "init_gpgme failed\n");
2802
exitcode = EX_UNAVAILABLE;
2805
gpgme_initialized = true;
2812
if(connect_to != NULL){
2813
/* Connect directly, do not use Zeroconf */
2814
/* (Mainly meant for debugging) */
2815
char *address = strrchr(connect_to, ':');
2817
if(address == NULL){
2818
fprintf_plus(stderr, "No colon in address\n");
2819
exitcode = EX_USAGE;
2829
tmpmax = strtoimax(address+1, &tmp, 10);
2830
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2831
or tmpmax != (in_port_t)tmpmax){
2832
fprintf_plus(stderr, "Bad port number\n");
2833
exitcode = EX_USAGE;
2841
port = (in_port_t)tmpmax;
2843
/* Colon in address indicates IPv6 */
2845
if(strchr(connect_to, ':') != NULL){
2847
/* Accept [] around IPv6 address - see RFC 5952 */
2848
if(connect_to[0] == '[' and address[-1] == ']')
859
gnutls_initalized = true;
875
if_index = (AvahiIfIndex) if_nametoindex(interface);
877
fprintf(stderr, "No such interface: \"%s\"\n", interface);
881
if(connect_to != NULL){
882
/* Connect directly, do not use Zeroconf */
883
/* (Mainly meant for debugging) */
884
char *address = strrchr(connect_to, ':');
886
fprintf(stderr, "No colon in address\n");
887
exitcode = EXIT_FAILURE;
891
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
893
perror("Bad port number");
894
exitcode = EXIT_FAILURE;
898
address = connect_to;
899
ret = start_mandos_communication(address, port, if_index, &mc);
901
exitcode = EXIT_FAILURE;
903
exitcode = EXIT_SUCCESS;
2856
address = connect_to;
908
/* If the interface is down, bring it up */
910
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
913
exitcode = EXIT_FAILURE;
916
strcpy(network.ifr_name, interface); /* Spurious warning */
917
ret = ioctl(sd, SIOCGIFFLAGS, &network);
919
perror("ioctl SIOCGIFFLAGS");
920
exitcode = EXIT_FAILURE;
923
if((network.ifr_flags & IFF_UP) == 0){
924
network.ifr_flags |= IFF_UP;
925
ret = ioctl(sd, SIOCSIFFLAGS, &network);
927
perror("ioctl SIOCSIFFLAGS");
928
exitcode = EXIT_FAILURE;
936
avahi_set_log_function(empty_log);
939
/* Initialize the pseudo-RNG for Avahi */
940
srand((unsigned int) time(NULL));
942
/* Allocate main Avahi loop object */
943
mc.simple_poll = avahi_simple_poll_new();
944
if (mc.simple_poll == NULL) {
945
fprintf(stderr, "Avahi: Failed to create simple poll"
947
exitcode = EXIT_FAILURE;
952
AvahiServerConfig config;
953
/* Do not publish any local Zeroconf records */
954
avahi_server_config_init(&config);
955
config.publish_hinfo = 0;
956
config.publish_addresses = 0;
957
config.publish_workstation = 0;
958
config.publish_domain = 0;
960
/* Allocate a new server */
961
mc.server = avahi_server_new(avahi_simple_poll_get
962
(mc.simple_poll), &config, NULL,
965
/* Free the Avahi configuration data */
966
avahi_server_config_free(&config);
969
/* Check if creating the Avahi server object succeeded */
970
if (mc.server == NULL) {
971
fprintf(stderr, "Failed to create Avahi server: %s\n",
972
avahi_strerror(error));
973
exitcode = EXIT_FAILURE;
977
/* Create the Avahi service browser */
978
sb = avahi_s_service_browser_new(mc.server, if_index,
980
"_mandos._tcp", NULL, 0,
981
browse_callback, &mc);
983
fprintf(stderr, "Failed to create service browser: %s\n",
984
avahi_strerror(avahi_server_errno(mc.server)));
985
exitcode = EXIT_FAILURE;
989
/* Run the main loop */
992
fprintf(stderr, "Starting Avahi loop search\n");
995
avahi_simple_poll_loop(mc.simple_poll);
2862
while(not quit_now){
2863
ret = start_mandos_communication(address, port, if_index, af,
2865
if(quit_now or ret == 0){
2869
fprintf_plus(stderr, "Retrying in %d seconds\n",
2870
(int)retry_interval);
2872
sleep((unsigned int)retry_interval);
2876
exitcode = EXIT_SUCCESS;
2887
AvahiServerConfig config;
2888
/* Do not publish any local Zeroconf records */
2889
avahi_server_config_init(&config);
2890
config.publish_hinfo = 0;
2891
config.publish_addresses = 0;
2892
config.publish_workstation = 0;
2893
config.publish_domain = 0;
2895
/* Allocate a new server */
2896
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2897
&config, NULL, NULL, &ret_errno);
2899
/* Free the Avahi configuration data */
2900
avahi_server_config_free(&config);
2903
/* Check if creating the Avahi server object succeeded */
2904
if(mc.server == NULL){
2905
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2906
avahi_strerror(ret_errno));
2907
exitcode = EX_UNAVAILABLE;
2915
/* Create the Avahi service browser */
2916
sb = avahi_s_service_browser_new(mc.server, if_index,
2917
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2918
NULL, 0, browse_callback,
2921
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2922
avahi_strerror(avahi_server_errno(mc.server)));
2923
exitcode = EX_UNAVAILABLE;
2931
/* Run the main loop */
2934
fprintf_plus(stderr, "Starting Avahi loop search\n");
2937
ret = avahi_loop_with_timeout(simple_poll,
2938
(int)(retry_interval * 1000), &mc);
2940
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2941
(ret == 0) ? "successfully" : "with error");
1000
fprintf(stderr, "%s exiting\n", argv[0]);
1003
/* Cleanup things */
1005
avahi_s_service_browser_free(sb);
1007
if (mc.server != NULL)
1008
avahi_server_free(mc.server);
1010
if (mc.simple_poll != NULL)
1011
avahi_simple_poll_free(mc.simple_poll);
1015
if (gnutls_initalized){
1016
gnutls_certificate_free_credentials (mc.cred);
1017
gnutls_global_deinit ();
2947
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2950
/* Cleanup things */
2951
free(mc.interfaces);
2954
avahi_s_service_browser_free(sb);
2956
if(mc.server != NULL)
2957
avahi_server_free(mc.server);
2959
if(simple_poll != NULL)
2960
avahi_simple_poll_free(simple_poll);
2962
if(gnutls_initialized){
2963
gnutls_certificate_free_credentials(mc.cred);
2964
gnutls_dh_params_deinit(mc.dh_params);
2967
if(gpgme_initialized){
2968
gpgme_release(mc.ctx);
2971
/* Cleans up the circular linked list of Mandos servers the client
2973
if(mc.current_server != NULL){
2974
mc.current_server->prev->next = NULL;
2975
while(mc.current_server != NULL){
2976
server *next = mc.current_server->next;
2978
#pragma GCC diagnostic push
2979
#pragma GCC diagnostic ignored "-Wcast-qual"
2981
free((char *)(mc.current_server->ip));
2983
#pragma GCC diagnostic pop
2985
free(mc.current_server);
2986
mc.current_server = next;
2990
/* Re-raise privileges */
2992
ret_errno = raise_privileges();
2995
perror_plus("Failed to raise privileges");
2998
/* Run network hooks */
2999
run_network_hooks("stop", interfaces_hooks != NULL ?
3000
interfaces_hooks : "", delay);
3002
/* Take down the network interfaces which were brought up */
3004
char *interface = NULL;
3005
while((interface=argz_next(interfaces_to_take_down,
3006
interfaces_to_take_down_size,
3008
ret_errno = take_down_interface(interface);
3011
perror_plus("Failed to take down interface");
3014
if(debug and (interfaces_to_take_down == NULL)){
3015
fprintf_plus(stderr, "No interfaces needed to be taken"
3021
ret_errno = lower_privileges_permanently();
3024
perror_plus("Failed to lower privileges permanently");
3028
free(interfaces_to_take_down);
3029
free(interfaces_hooks);
3031
void clean_dir_at(int base, const char * const dirname,
3033
struct dirent **direntries = NULL;
3035
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3041
perror_plus("open");
3043
int numentries = scandirat(dir_fd, ".", &direntries,
3044
notdotentries, alphasort);
3045
if(numentries >= 0){
3046
for(int i = 0; i < numentries; i++){
3048
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3049
dirname, direntries[i]->d_name);
3051
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3053
if(errno == EISDIR){
3054
dret = unlinkat(dir_fd, direntries[i]->d_name,
3057
if((dret == -1) and (errno == ENOTEMPTY)
3058
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3059
== 0) and (level == 0)){
3060
/* Recurse only in this special case */
3061
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3065
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3066
direntries[i]->d_name, strerror(errno));
3069
free(direntries[i]);
3072
/* need to clean even if 0 because man page doesn't specify */
3074
if(numentries == -1){
3075
perror_plus("scandirat");
3077
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3078
if(dret == -1 and errno != ENOENT){
3079
perror_plus("rmdir");
3082
perror_plus("scandirat");
3087
/* Removes the GPGME temp directory and all files inside */
3088
if(tempdir != NULL){
3089
clean_dir_at(-1, tempdir, 0);
3093
sigemptyset(&old_sigterm_action.sa_mask);
3094
old_sigterm_action.sa_handler = SIG_DFL;
3095
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3096
&old_sigterm_action,
3099
perror_plus("sigaction");
3102
ret = raise(signal_received);
3103
} while(ret != 0 and errno == EINTR);
3105
perror_plus("raise");
3108
TEMP_FAILURE_RETRY(pause());