111
51
#include <avahi-common/malloc.h>
112
52
#include <avahi-common/error.h>
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
118
init_gnutls_session(),
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
125
#include <gpgme.h> /* All GPGME types, constants and
128
GPGME_PROTOCOL_OpenPGP,
72
#include <errno.h> /* perror() */
131
75
#define BUFFER_SIZE 256
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
77
bool debug = false;
139
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
160
/* Used for passing in values through the Avahi callback functions */
78
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
const char mandos_protocol_version[] = "1";
83
/* Used for passing in values through all the callback functions */
85
AvahiSimplePoll *simple_poll;
162
86
AvahiServer *server;
163
87
gnutls_certificate_credentials_t cred;
164
88
unsigned int dh_bits;
165
89
gnutls_dh_params_t dh_params;
166
90
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
201
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
93
size_t adjustbuffer(char **buffer, size_t buffer_length,
94
size_t buffer_capacity){
95
if (buffer_length + BUFFER_SIZE > buffer_capacity){
96
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
100
buffer_capacity += BUFFER_SIZE;
218
102
return buffer_capacity;
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
106
* Decrypt OpenPGP data using keyrings in HOMEDIR.
107
* Returns -1 on error
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
109
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
const char *homedir){
113
gpgme_data_t dh_crypto, dh_plain;
277
115
gpgme_error_t rc;
117
size_t plaintext_capacity = 0;
118
ssize_t plaintext_length = 0;
278
119
gpgme_engine_info_t engine_info;
281
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
286
gpgme_data_t pgp_data;
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
122
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
321
126
gpgme_check_version(NULL);
322
127
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
128
if (rc != GPG_ERR_NO_ERROR){
129
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
130
gpgme_strsource(rc), gpgme_strerror(rc));
329
134
/* Set GPGME home directory for the OpenPGP engine only */
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
135
rc = gpgme_get_engine_info (&engine_info);
136
if (rc != GPG_ERR_NO_ERROR){
137
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
138
gpgme_strsource(rc), gpgme_strerror(rc));
336
141
while(engine_info != NULL){
337
142
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
338
143
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
339
engine_info->file_name, tempdir);
144
engine_info->file_name, homedir);
342
147
engine_info = engine_info->next;
344
149
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
if(not import_key(pubkey) or not import_key(seckey)){
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
375
gpgme_data_t dh_crypto, dh_plain;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
150
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
385
154
/* Create new GPGME data buffer from memory cryptotext */
386
155
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
394
163
/* Create new empty GPGME data buffer for the plaintext */
395
164
rc = gpgme_data_new(&dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
400
168
gpgme_data_release(dh_crypto);
172
/* Create new GPGME "context" */
173
rc = gpgme_new(&ctx);
174
if (rc != GPG_ERR_NO_ERROR){
175
fprintf(stderr, "bad gpgme_new: %s: %s\n",
176
gpgme_strsource(rc), gpgme_strerror(rc));
177
plaintext_length = -1;
404
181
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
183
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
184
if (rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
410
187
plaintext_length = -1;
412
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
421
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
192
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
gpgme_decrypt_result_t result;
197
result = gpgme_op_decrypt_result(ctx);
199
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
201
fprintf(stderr, "Unsupported algorithm: %s\n",
202
result->unsupported_algorithm);
203
fprintf(stderr, "Wrong key usage: %d\n",
204
result->wrong_key_usage);
205
if(result->file_name != NULL){
206
fprintf(stderr, "File name: %s\n", result->file_name);
208
gpgme_recipient_t recipient;
209
recipient = result->recipients;
426
211
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
212
fprintf(stderr, "Public key algorithm: %s\n",
213
gpgme_pubkey_algo_name(recipient->pubkey_algo));
214
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
215
fprintf(stderr, "Secret key available: %s\n",
216
recipient->status == GPG_ERR_NO_SECKEY
434
218
recipient = recipient->next;
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
445
224
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
225
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
226
perror("pgpme_data_seek");
448
227
plaintext_length = -1;
449
228
goto decrypt_end;
452
231
*plaintext = NULL;
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
233
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
235
if (plaintext_capacity == 0){
236
perror("adjustbuffer");
237
plaintext_length = -1;
463
241
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
243
/* Print the data, if any */
471
perror_plus("gpgme_data_read");
249
perror("gpgme_data_read");
472
250
plaintext_length = -1;
473
251
goto decrypt_end;
475
253
plaintext_length += ret;
479
fprintf_plus(stderr, "Decrypted password is: ");
257
fprintf(stderr, "Decrypted password is: ");
480
258
for(ssize_t i = 0; i < plaintext_length; i++){
481
259
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
542
311
/* OpenPGP credentials */
543
ret = gnutls_certificate_allocate_credentials(&mc->cred);
544
if(ret != GNUTLS_E_SUCCESS){
545
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
546
safer_gnutls_strerror(ret));
547
gnutls_global_deinit();
312
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
313
!= GNUTLS_E_SUCCESS) {
314
fprintf (stderr, "GnuTLS memory error: %s\n",
315
safer_gnutls_strerror(ret));
552
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
553
" secret key %s as GnuTLS credentials\n",
320
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
321
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
558
325
ret = gnutls_certificate_set_openpgp_key_file
559
(mc->cred, pubkeyfilename, seckeyfilename,
560
GNUTLS_OPENPGP_FMT_BASE64);
561
if(ret != GNUTLS_E_SUCCESS){
563
"Error[%d] while reading the OpenPGP key pair ('%s',"
564
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
565
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
566
safer_gnutls_strerror(ret));
326
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
327
if (ret != GNUTLS_E_SUCCESS) {
329
"Error[%d] while reading the OpenPGP key pair ('%s',"
330
" '%s')\n", ret, pubkeyfile, seckeyfile);
331
fprintf(stdout, "The GnuTLS error is: %s\n",
332
safer_gnutls_strerror(ret));
570
336
/* GnuTLS server initialization */
571
337
ret = gnutls_dh_params_init(&mc->dh_params);
572
if(ret != GNUTLS_E_SUCCESS){
573
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
574
" initialization: %s\n",
575
safer_gnutls_strerror(ret));
578
if(mc->dh_bits == 0){
579
/* Find out the optimal number of DH bits */
580
/* Try to read the private key file */
581
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
583
int secfile = open(seckeyfilename, O_RDONLY);
584
size_t buffer_capacity = 0;
586
buffer_capacity = incbuffer((char **)&buffer.data,
588
(size_t)buffer_capacity);
589
if(buffer_capacity == 0){
590
perror_plus("incbuffer");
595
ssize_t bytes_read = read(secfile, buffer.data + buffer.size,
601
/* check bytes_read for failure */
608
buffer.size += (unsigned int)bytes_read;
612
/* If successful, use buffer to parse private key */
613
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
614
if(buffer.data != NULL){
616
gnutls_openpgp_privkey_t privkey = NULL;
617
ret = gnutls_openpgp_privkey_init(&privkey);
618
if(ret != GNUTLS_E_SUCCESS){
619
fprintf_plus(stderr, "Error initializing OpenPGP key"
620
" structure: %s", safer_gnutls_strerror(ret));
624
ret = gnutls_openpgp_privkey_import(privkey, &buffer,
625
GNUTLS_OPENPGP_FMT_BASE64,
627
if(ret != GNUTLS_E_SUCCESS){
628
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
629
safer_gnutls_strerror(ret));
635
/* Use private key to suggest an appropriate sec_param */
636
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
637
gnutls_openpgp_privkey_deinit(privkey);
639
fprintf_plus(stderr, "This OpenPGP key implies using a"
640
" GnuTLS security parameter \"%s\".\n",
641
safe_string(gnutls_sec_param_get_name
647
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
648
/* Err on the side of caution */
649
sec_param = GNUTLS_SEC_PARAM_ULTRA;
651
fprintf_plus(stderr, "Falling back to security parameter"
653
safe_string(gnutls_sec_param_get_name
658
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
662
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
663
" implies %u DH bits; using that.\n",
664
safe_string(gnutls_sec_param_get_name
669
fprintf_plus(stderr, "Failed to get implied number of DH"
670
" bits for security parameter \"%s\"): %s\n",
671
safe_string(gnutls_sec_param_get_name(sec_param)),
672
safer_gnutls_strerror(ret));
676
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
338
if (ret != GNUTLS_E_SUCCESS) {
339
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
340
" %s\n", safer_gnutls_strerror(ret));
679
343
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
680
if(ret != GNUTLS_E_SUCCESS){
681
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u bits):"
682
" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
346
safer_gnutls_strerror(ret));
686
350
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
692
gnutls_certificate_free_credentials(mc->cred);
693
gnutls_global_deinit();
694
gnutls_dh_params_deinit(mc->dh_params);
698
__attribute__((nonnull, warn_unused_result))
699
static int init_gnutls_session(gnutls_session_t *session,
355
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
702
357
/* GnuTLS session creation */
704
ret = gnutls_init(session, GNUTLS_SERVER);
708
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
709
if(ret != GNUTLS_E_SUCCESS){
711
"Error in GnuTLS session initialization: %s\n",
712
safer_gnutls_strerror(ret));
358
ret = gnutls_init(session, GNUTLS_SERVER);
359
if (ret != GNUTLS_E_SUCCESS){
360
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
361
safer_gnutls_strerror(ret));
718
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
720
gnutls_deinit(*session);
723
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
724
if(ret != GNUTLS_E_SUCCESS){
725
fprintf_plus(stderr, "Syntax error at: %s\n", err);
726
fprintf_plus(stderr, "GnuTLS error: %s\n",
727
safer_gnutls_strerror(ret));
728
gnutls_deinit(*session);
366
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
367
if (ret != GNUTLS_E_SUCCESS) {
368
fprintf(stderr, "Syntax error at: %s\n", err);
369
fprintf(stderr, "GnuTLS error: %s\n",
370
safer_gnutls_strerror(ret));
734
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
737
gnutls_deinit(*session);
740
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
743
safer_gnutls_strerror(ret));
744
gnutls_deinit(*session);
375
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
377
if (ret != GNUTLS_E_SUCCESS) {
378
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
379
safer_gnutls_strerror(ret));
748
383
/* ignore client certificate if any. */
749
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
384
gnutls_certificate_server_set_request (*session,
751
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
387
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
757
393
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
758
394
__attribute__((unused)) const char *txt){}
760
/* Set effective uid to 0, return errno */
761
__attribute__((warn_unused_result))
762
error_t raise_privileges(void){
763
error_t old_errno = errno;
764
error_t ret_errno = 0;
765
if(seteuid(0) == -1){
772
/* Set effective and real user ID to 0. Return errno. */
773
__attribute__((warn_unused_result))
774
error_t raise_privileges_permanently(void){
775
error_t old_errno = errno;
776
error_t ret_errno = raise_privileges();
788
/* Set effective user ID to unprivileged saved user ID */
789
__attribute__((warn_unused_result))
790
error_t lower_privileges(void){
791
error_t old_errno = errno;
792
error_t ret_errno = 0;
793
if(seteuid(uid) == -1){
800
/* Lower privileges permanently */
801
__attribute__((warn_unused_result))
802
error_t lower_privileges_permanently(void){
803
error_t old_errno = errno;
804
error_t ret_errno = 0;
805
if(setuid(uid) == -1){
812
/* Helper function to add_local_route() and delete_local_route() */
813
__attribute__((nonnull, warn_unused_result))
814
static bool add_delete_local_route(const bool add,
816
AvahiIfIndex if_index){
818
char helper[] = "mandos-client-iprouteadddel";
819
char add_arg[] = "add";
820
char delete_arg[] = "delete";
821
char debug_flag[] = "--debug";
822
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
823
if(pluginhelperdir == NULL){
825
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
826
" variable not set; cannot run helper\n");
831
char interface[IF_NAMESIZE];
832
if(if_indextoname((unsigned int)if_index, interface) == NULL){
833
perror_plus("if_indextoname");
837
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
839
perror_plus("open(\"/dev/null\", O_RDONLY)");
845
/* Raise privileges */
846
errno = raise_privileges_permanently();
848
perror_plus("Failed to raise privileges");
849
/* _exit(EX_NOPERM); */
855
perror_plus("setgid");
858
/* Reset supplementary groups */
860
ret = setgroups(0, NULL);
862
perror_plus("setgroups");
866
ret = dup2(devnull, STDIN_FILENO);
868
perror_plus("dup2(devnull, STDIN_FILENO)");
871
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
873
perror_plus("close");
876
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
878
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
881
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
886
if(helperdir_fd == -1){
888
_exit(EX_UNAVAILABLE);
890
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
893
perror_plus("openat");
894
_exit(EX_UNAVAILABLE);
896
TEMP_FAILURE_RETRY(close(helperdir_fd));
898
#pragma GCC diagnostic push
899
#pragma GCC diagnostic ignored "-Wcast-qual"
901
if(fexecve(helper_fd, (char *const [])
902
{ helper, add ? add_arg : delete_arg, (char *)address,
903
interface, debug ? debug_flag : NULL, NULL },
906
#pragma GCC diagnostic pop
908
perror_plus("fexecve");
920
pret = waitpid(pid, &status, 0);
921
if(pret == -1 and errno == EINTR and quit_now){
922
int errno_raising = 0;
923
if((errno = raise_privileges()) != 0){
924
errno_raising = errno;
925
perror_plus("Failed to raise privileges in order to"
926
" kill helper program");
928
if(kill(pid, SIGTERM) == -1){
931
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
932
perror_plus("Failed to lower privileges after killing"
937
} while(pret == -1 and errno == EINTR);
939
perror_plus("waitpid");
942
if(WIFEXITED(status)){
943
if(WEXITSTATUS(status) != 0){
944
fprintf_plus(stderr, "Error: iprouteadddel exited"
945
" with status %d\n", WEXITSTATUS(status));
950
if(WIFSIGNALED(status)){
951
fprintf_plus(stderr, "Error: iprouteadddel died by"
952
" signal %d\n", WTERMSIG(status));
955
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
959
__attribute__((nonnull, warn_unused_result))
960
static bool add_local_route(const char *address,
961
AvahiIfIndex if_index){
963
fprintf_plus(stderr, "Adding route to %s\n", address);
965
return add_delete_local_route(true, address, if_index);
968
__attribute__((nonnull, warn_unused_result))
969
static bool delete_local_route(const char *address,
970
AvahiIfIndex if_index){
972
fprintf_plus(stderr, "Removing route to %s\n", address);
974
return add_delete_local_route(false, address, if_index);
977
396
/* Called when a Mandos server is found */
978
__attribute__((nonnull, warn_unused_result))
979
static int start_mandos_communication(const char *ip, in_port_t port,
397
static int start_mandos_communication(const char *ip, uint16_t port,
980
398
AvahiIfIndex if_index,
981
int af, mandos_context *mc){
982
int ret, tcp_sd = -1;
984
struct sockaddr_storage to;
401
struct sockaddr_in6 to;
985
402
char *buffer = NULL;
986
char *decrypted_buffer = NULL;
403
char *decrypted_buffer;
987
404
size_t buffer_length = 0;
988
405
size_t buffer_capacity = 0;
406
ssize_t decrypted_buffer_size;
409
char interface[IF_NAMESIZE];
991
410
gnutls_session_t session;
992
int pf; /* Protocol family */
993
bool route_added = false;
1010
fprintf_plus(stderr, "Bad address family: %d\n", af);
1015
/* If the interface is specified and we have a list of interfaces */
1016
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1017
/* Check if the interface is one of the interfaces we are using */
1020
char *interface = NULL;
1021
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1023
if(if_nametoindex(interface) == (unsigned int)if_index){
1030
/* This interface does not match any in the list, so we don't
1031
connect to the server */
1033
char interface[IF_NAMESIZE];
1034
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1035
perror_plus("if_indextoname");
1037
fprintf_plus(stderr, "Skipping server on non-used interface"
1039
if_indextoname((unsigned int)if_index,
411
gnutls_dh_params_t dh_params;
413
ret = init_gnutls_session (mc, &session);
419
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
423
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
430
if(if_indextoname((unsigned int)if_index, interface) == NULL){
431
perror("if_indextoname");
434
fprintf(stderr, "Binding to interface %s\n", interface);
1047
ret = init_gnutls_session(&session, mc);
437
memset(&to,0,sizeof(to)); /* Spurious warning */
438
to.sin6_family = AF_INET6;
439
/* It would be nice to have a way to detect if we were passed an
440
IPv4 address here. Now we assume an IPv6 address. */
441
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
1053
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1054
PRIuMAX "\n", ip, (uintmax_t)port);
1057
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1060
perror_plus("socket");
1070
memset(&to, 0, sizeof(to));
1072
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
1073
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
1075
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
1076
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
1080
perror_plus("inet_pton");
1086
fprintf_plus(stderr, "Bad address: %s\n", ip);
1091
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1092
if(IN6_IS_ADDR_LINKLOCAL
1093
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1094
if(if_index == AVAHI_IF_UNSPEC){
1095
fprintf_plus(stderr, "An IPv6 link-local address is"
1096
" incomplete without a network interface\n");
1100
/* Set the network interface number as scope */
1101
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1104
((struct sockaddr_in *)&to)->sin_port = htons(port);
447
fprintf(stderr, "Bad address: %s\n", ip);
450
to.sin6_port = htons(port); /* Spurious warning */
452
to.sin6_scope_id = (uint32_t)if_index;
1113
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1114
char interface[IF_NAMESIZE];
1115
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1116
perror_plus("if_indextoname");
1118
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1119
"\n", ip, interface, (uintmax_t)port);
1122
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1123
ip, (uintmax_t)port);
1125
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1126
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1128
ret = getnameinfo((struct sockaddr *)&to,
1129
sizeof(struct sockaddr_in6),
1130
addrstr, sizeof(addrstr), NULL, 0,
1133
ret = getnameinfo((struct sockaddr *)&to,
1134
sizeof(struct sockaddr_in),
1135
addrstr, sizeof(addrstr), NULL, 0,
1138
if(ret == EAI_SYSTEM){
1139
perror_plus("getnameinfo");
1140
} else if(ret != 0) {
1141
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1142
} else if(strcmp(addrstr, ip) != 0){
1143
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1154
ret = connect(tcp_sd, (struct sockaddr *)&to,
1155
sizeof(struct sockaddr_in6));
1157
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1158
sizeof(struct sockaddr_in));
1161
if(errno == ENETUNREACH
1162
and if_index != AVAHI_IF_UNSPEC
1163
and connect_to == NULL
1164
and not route_added and
1165
((af == AF_INET6 and not
1166
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1168
or (af == AF_INET and
1169
/* Not a a IPv4LL address */
1170
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1171
& 0xFFFF0000L) != 0xA9FE0000L))){
1172
/* Work around Avahi bug - Avahi does not announce link-local
1173
addresses if it has a global address, so local hosts with
1174
*only* a link-local address (e.g. Mandos clients) cannot
1175
connect to a Mandos server announced by Avahi on a server
1176
host with a global address. Work around this by retrying
1177
with an explicit route added with the server's address.
1179
Avahi bug reference:
1180
http://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1181
https://bugs.debian.org/587961
1184
fprintf_plus(stderr, "Mandos server unreachable, trying"
1188
route_added = add_local_route(ip, if_index);
1194
if(errno != ECONNREFUSED or debug){
1196
perror_plus("connect");
455
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
456
char addrstr[INET6_ADDRSTRLEN] = "";
457
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
458
sizeof(addrstr)) == NULL){
461
if(strcmp(addrstr, ip) != 0){
462
fprintf(stderr, "Canonical address form: %s\n", addrstr);
467
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
1209
473
const char *out = mandos_protocol_version;
1212
476
size_t out_size = strlen(out);
1213
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1214
out_size - written));
1217
perror_plus("write");
477
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
478
out_size - written));
1219
482
goto mandos_end;
1221
484
written += (size_t)ret;
1222
485
if(written < out_size){
1225
if(out == mandos_protocol_version){
488
if (out == mandos_protocol_version){
1240
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1248
/* This casting via intptr_t is to eliminate warning about casting
1249
an int to a pointer type. This is exactly how the GnuTLS Guile
1250
function "set-session-transport-fd!" does it. */
1251
gnutls_transport_set_ptr(session,
1252
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1260
ret = gnutls_handshake(session);
1265
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1267
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Establishing TLS session with %s\n", ip);
501
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
503
ret = gnutls_handshake (session);
505
if (ret != GNUTLS_E_SUCCESS){
1269
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
507
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1273
511
goto mandos_end;
1276
514
/* Read OpenPGP packet that contains the wanted password */
1279
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
517
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1290
buffer_capacity = incbuffer(&buffer, buffer_length,
1292
if(buffer_capacity == 0){
1294
perror_plus("incbuffer");
1304
sret = gnutls_record_recv(session, buffer+buffer_length,
522
buffer_capacity = adjustbuffer(&buffer, buffer_length, buffer_capacity);
523
if (buffer_capacity == 0){
524
perror("adjustbuffer");
529
ret = gnutls_record_recv(session, buffer+buffer_length,
1311
536
case GNUTLS_E_INTERRUPTED:
1312
537
case GNUTLS_E_AGAIN:
1314
539
case GNUTLS_E_REHANDSHAKE:
1316
ret = gnutls_handshake(session);
1322
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1324
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
540
ret = gnutls_handshake (session);
542
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1328
545
goto mandos_end;
1332
fprintf_plus(stderr, "Unknown error while reading data from"
1333
" encrypted session with Mandos server\n");
1334
gnutls_bye(session, GNUTLS_SHUT_RDWR);
549
fprintf(stderr, "Unknown error while reading data from"
550
" encrypted session with Mandos server\n");
552
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1336
553
goto mandos_end;
1339
buffer_length += (size_t) sret;
556
buffer_length += (size_t) ret;
1344
fprintf_plus(stderr, "Closing TLS session\n");
1353
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1358
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1360
if(buffer_length > 0){
1361
ssize_t decrypted_buffer_size;
1362
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1363
&decrypted_buffer, mc);
1364
if(decrypted_buffer_size >= 0){
561
fprintf(stderr, "Closing TLS session\n");
564
gnutls_bye (session, GNUTLS_SHUT_RDWR);
566
if (buffer_length > 0){
567
decrypted_buffer_size = pgp_packet_decrypt(buffer,
571
if (decrypted_buffer_size >= 0){
1367
573
while(written < (size_t) decrypted_buffer_size){
1373
ret = (int)fwrite(decrypted_buffer + written, 1,
1374
(size_t)decrypted_buffer_size - written,
574
ret = (int)fwrite (decrypted_buffer + written, 1,
575
(size_t)decrypted_buffer_size - written,
1376
577
if(ret == 0 and ferror(stdout)){
1379
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
579
fprintf(stderr, "Error writing encrypted data: %s\n",
1385
585
written += (size_t)ret;
587
free(decrypted_buffer);
1391
593
/* Shutdown procedure */
1396
if(not delete_local_route(ip, if_index)){
1397
fprintf_plus(stderr, "Failed to delete local route to %s on"
1398
" interface %d", ip, if_index);
1402
free(decrypted_buffer);
1405
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1411
perror_plus("close");
1413
gnutls_deinit(session);
598
gnutls_deinit (session);
599
gnutls_certificate_free_credentials (mc->cred);
600
gnutls_global_deinit ();
1423
__attribute__((nonnull))
1424
604
static void resolve_callback(AvahiSServiceResolver *r,
1425
605
AvahiIfIndex interface,
1426
AvahiProtocol proto,
606
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1427
607
AvahiResolverEvent event,
1428
608
const char *name,
1429
609
const char *type,
1538
691
case AVAHI_BROWSER_ALL_FOR_NOW:
1539
692
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1541
fprintf_plus(stderr, "No Mandos server found, still"
694
fprintf(stderr, "No Mandos server found, still searching...\n");
1548
/* Signal handler that stops main loop after SIGTERM */
1549
static void handle_sigterm(int sig){
1554
signal_received = sig;
1555
int old_errno = errno;
1556
/* set main loop to exit */
1557
if(simple_poll != NULL){
1558
avahi_simple_poll_quit(simple_poll);
1563
__attribute__((nonnull, warn_unused_result))
1564
bool get_flags(const char *ifname, struct ifreq *ifr){
1568
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1571
perror_plus("socket");
1575
strcpy(ifr->ifr_name, ifname);
1576
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1580
perror_plus("ioctl SIOCGIFFLAGS");
1588
__attribute__((nonnull, warn_unused_result))
1589
bool good_flags(const char *ifname, const struct ifreq *ifr){
1591
/* Reject the loopback device */
1592
if(ifr->ifr_flags & IFF_LOOPBACK){
1594
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1599
/* Accept point-to-point devices only if connect_to is specified */
1600
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1602
fprintf_plus(stderr, "Accepting point-to-point interface"
1603
" \"%s\"\n", ifname);
1607
/* Otherwise, reject non-broadcast-capable devices */
1608
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1610
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1611
" \"%s\"\n", ifname);
1615
/* Reject non-ARP interfaces (including dummy interfaces) */
1616
if(ifr->ifr_flags & IFF_NOARP){
1618
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1624
/* Accept this device */
1626
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1632
* This function determines if a directory entry in /sys/class/net
1633
* corresponds to an acceptable network device.
1634
* (This function is passed to scandir(3) as a filter function.)
1636
__attribute__((nonnull, warn_unused_result))
1637
int good_interface(const struct dirent *if_entry){
1638
if(if_entry->d_name[0] == '.'){
1643
if(not get_flags(if_entry->d_name, &ifr)){
1645
fprintf_plus(stderr, "Failed to get flags for interface "
1646
"\"%s\"\n", if_entry->d_name);
1651
if(not good_flags(if_entry->d_name, &ifr)){
1658
* This function determines if a network interface is up.
1660
__attribute__((nonnull, warn_unused_result))
1661
bool interface_is_up(const char *interface){
1663
if(not get_flags(interface, &ifr)){
1665
fprintf_plus(stderr, "Failed to get flags for interface "
1666
"\"%s\"\n", interface);
1671
return (bool)(ifr.ifr_flags & IFF_UP);
1675
* This function determines if a network interface is running
1677
__attribute__((nonnull, warn_unused_result))
1678
bool interface_is_running(const char *interface){
1680
if(not get_flags(interface, &ifr)){
1682
fprintf_plus(stderr, "Failed to get flags for interface "
1683
"\"%s\"\n", interface);
1688
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1691
__attribute__((nonnull, pure, warn_unused_result))
1692
int notdotentries(const struct dirent *direntry){
1693
/* Skip "." and ".." */
1694
if(direntry->d_name[0] == '.'
1695
and (direntry->d_name[1] == '\0'
1696
or (direntry->d_name[1] == '.'
1697
and direntry->d_name[2] == '\0'))){
1703
/* Is this directory entry a runnable program? */
1704
__attribute__((nonnull, warn_unused_result))
1705
int runnable_hook(const struct dirent *direntry){
1710
if((direntry->d_name)[0] == '\0'){
1715
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1716
"abcdefghijklmnopqrstuvwxyz"
1719
if((direntry->d_name)[sret] != '\0'){
1720
/* Contains non-allowed characters */
1722
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1728
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1731
perror_plus("Could not stat hook");
1735
if(not (S_ISREG(st.st_mode))){
1736
/* Not a regular file */
1738
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1743
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1744
/* Not executable */
1746
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1752
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1758
__attribute__((nonnull, warn_unused_result))
1759
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1760
mandos_context *mc){
1762
struct timespec now;
1763
struct timespec waited_time;
1764
intmax_t block_time;
1767
if(mc->current_server == NULL){
1769
fprintf_plus(stderr, "Wait until first server is found."
1772
ret = avahi_simple_poll_iterate(s, -1);
1775
fprintf_plus(stderr, "Check current_server if we should run"
1778
/* the current time */
1779
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1781
perror_plus("clock_gettime");
1784
/* Calculating in ms how long time between now and server
1785
who we visted longest time ago. Now - last seen. */
1786
waited_time.tv_sec = (now.tv_sec
1787
- mc->current_server->last_seen.tv_sec);
1788
waited_time.tv_nsec = (now.tv_nsec
1789
- mc->current_server->last_seen.tv_nsec);
1790
/* total time is 10s/10,000ms.
1791
Converting to s from ms by dividing by 1,000,
1792
and ns to ms by dividing by 1,000,000. */
1793
block_time = ((retry_interval
1794
- ((intmax_t)waited_time.tv_sec * 1000))
1795
- ((intmax_t)waited_time.tv_nsec / 1000000));
1798
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1802
if(block_time <= 0){
1803
ret = start_mandos_communication(mc->current_server->ip,
1804
mc->current_server->port,
1805
mc->current_server->if_index,
1806
mc->current_server->af, mc);
1808
avahi_simple_poll_quit(s);
1811
ret = clock_gettime(CLOCK_MONOTONIC,
1812
&mc->current_server->last_seen);
1814
perror_plus("clock_gettime");
1817
mc->current_server = mc->current_server->next;
1818
block_time = 0; /* Call avahi to find new Mandos
1819
servers, but don't block */
1822
ret = avahi_simple_poll_iterate(s, (int)block_time);
1825
if(ret > 0 or errno != EINTR){
1826
return (ret != 1) ? ret : 0;
1832
__attribute__((nonnull))
1833
void run_network_hooks(const char *mode, const char *interface,
1835
struct dirent **direntries = NULL;
1836
if(hookdir_fd == -1){
1837
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1839
if(hookdir_fd == -1){
1840
if(errno == ENOENT){
1842
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1843
" found\n", hookdir);
1846
perror_plus("open");
1852
#if __GLIBC_PREREQ(2, 15)
1853
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1854
runnable_hook, alphasort);
1855
#else /* not __GLIBC_PREREQ(2, 15) */
1856
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1858
#endif /* not __GLIBC_PREREQ(2, 15) */
1859
#else /* not __GLIBC__ */
1860
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1862
#endif /* not __GLIBC__ */
1864
perror_plus("scandir");
1867
struct dirent *direntry;
1869
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1871
perror_plus("open(\"/dev/null\", O_RDONLY)");
1874
for(int i = 0; i < numhooks; i++){
1875
direntry = direntries[i];
1877
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1880
pid_t hook_pid = fork();
1883
/* Raise privileges */
1884
errno = raise_privileges_permanently();
1886
perror_plus("Failed to raise privileges");
1893
perror_plus("setgid");
1896
/* Reset supplementary groups */
1898
ret = setgroups(0, NULL);
1900
perror_plus("setgroups");
1903
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1905
perror_plus("setenv");
1908
ret = setenv("DEVICE", interface, 1);
1910
perror_plus("setenv");
1913
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1915
perror_plus("setenv");
1918
ret = setenv("MODE", mode, 1);
1920
perror_plus("setenv");
1924
ret = asprintf(&delaystring, "%f", (double)delay);
1926
perror_plus("asprintf");
1929
ret = setenv("DELAY", delaystring, 1);
1932
perror_plus("setenv");
1936
if(connect_to != NULL){
1937
ret = setenv("CONNECT", connect_to, 1);
1939
perror_plus("setenv");
1943
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
1947
perror_plus("openat");
1948
_exit(EXIT_FAILURE);
1950
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1951
perror_plus("close");
1952
_exit(EXIT_FAILURE);
1954
ret = dup2(devnull, STDIN_FILENO);
1956
perror_plus("dup2(devnull, STDIN_FILENO)");
1959
ret = (int)TEMP_FAILURE_RETRY(close(devnull));
1961
perror_plus("close");
1964
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1966
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1969
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1971
perror_plus("fexecve");
1972
_exit(EXIT_FAILURE);
1976
perror_plus("fork");
1981
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1982
perror_plus("waitpid");
1986
if(WIFEXITED(status)){
1987
if(WEXITSTATUS(status) != 0){
1988
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1989
" with status %d\n", direntry->d_name,
1990
WEXITSTATUS(status));
1994
} else if(WIFSIGNALED(status)){
1995
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1996
" signal %d\n", direntry->d_name,
2001
fprintf_plus(stderr, "Warning: network hook \"%s\""
2002
" crashed\n", direntry->d_name);
2008
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2014
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
2015
perror_plus("close");
2022
__attribute__((nonnull, warn_unused_result))
2023
error_t bring_up_interface(const char *const interface,
2025
error_t old_errno = errno;
2027
struct ifreq network;
2028
unsigned int if_index = if_nametoindex(interface);
2030
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2040
if(not interface_is_up(interface)){
2041
error_t ret_errno = 0, ioctl_errno = 0;
2042
if(not get_flags(interface, &network)){
2044
fprintf_plus(stderr, "Failed to get flags for interface "
2045
"\"%s\"\n", interface);
2049
network.ifr_flags |= IFF_UP; /* set flag */
2051
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2054
perror_plus("socket");
2060
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2062
perror_plus("close");
2069
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2073
/* Raise privileges */
2074
ret_errno = raise_privileges();
2077
perror_plus("Failed to raise privileges");
2082
bool restore_loglevel = false;
2084
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2085
messages about the network interface to mess up the prompt */
2086
ret_linux = klogctl(8, NULL, 5);
2087
if(ret_linux == -1){
2088
perror_plus("klogctl");
2090
restore_loglevel = true;
2093
#endif /* __linux__ */
2094
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2095
ioctl_errno = errno;
2097
if(restore_loglevel){
2098
ret_linux = klogctl(7, NULL, 0);
2099
if(ret_linux == -1){
2100
perror_plus("klogctl");
2103
#endif /* __linux__ */
2105
/* If raise_privileges() succeeded above */
2107
/* Lower privileges */
2108
ret_errno = lower_privileges();
2111
perror_plus("Failed to lower privileges");
2115
/* Close the socket */
2116
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2118
perror_plus("close");
2121
if(ret_setflags == -1){
2122
errno = ioctl_errno;
2123
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2128
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2132
/* Sleep checking until interface is running.
2133
Check every 0.25s, up to total time of delay */
2134
for(int i=0; i < delay * 4; i++){
2135
if(interface_is_running(interface)){
2138
struct timespec sleeptime = { .tv_nsec = 250000000 };
2139
ret = nanosleep(&sleeptime, NULL);
2140
if(ret == -1 and errno != EINTR){
2141
perror_plus("nanosleep");
2149
__attribute__((nonnull, warn_unused_result))
2150
error_t take_down_interface(const char *const interface){
2151
error_t old_errno = errno;
2152
struct ifreq network;
2153
unsigned int if_index = if_nametoindex(interface);
2155
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2159
if(interface_is_up(interface)){
2160
error_t ret_errno = 0, ioctl_errno = 0;
2161
if(not get_flags(interface, &network) and debug){
2163
fprintf_plus(stderr, "Failed to get flags for interface "
2164
"\"%s\"\n", interface);
2168
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2170
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2173
perror_plus("socket");
2179
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2183
/* Raise privileges */
2184
ret_errno = raise_privileges();
2187
perror_plus("Failed to raise privileges");
2190
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2191
ioctl_errno = errno;
2193
/* If raise_privileges() succeeded above */
2195
/* Lower privileges */
2196
ret_errno = lower_privileges();
2199
perror_plus("Failed to lower privileges");
2203
/* Close the socket */
2204
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
2206
perror_plus("close");
2209
if(ret_setflags == -1){
2210
errno = ioctl_errno;
2211
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2216
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
700
/* Combines file name and path and returns the malloced new
701
string. some sane checks could/should be added */
702
static const char *combinepath(const char *first, const char *second){
703
size_t f_len = strlen(first);
704
size_t s_len = strlen(second);
705
char *tmp = malloc(f_len + s_len + 2);
710
memcpy(tmp, first, f_len); /* Spurious warning */
714
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
716
tmp[f_len + 1 + s_len] = '\0';
2224
721
int main(int argc, char *argv[]){
2225
mandos_context mc = { .server = NULL, .dh_bits = 0,
2226
.priority = "SECURE256:!CTYPE-X.509:"
2227
"+CTYPE-OPENPGP:!RSA", .current_server = NULL,
2228
.interfaces = NULL, .interfaces_size = 0 };
2229
AvahiSServiceBrowser *sb = NULL;
2234
int exitcode = EXIT_SUCCESS;
2235
char *interfaces_to_take_down = NULL;
2236
size_t interfaces_to_take_down_size = 0;
2237
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2238
char old_tempdir[] = "/tmp/mandosXXXXXX";
2239
char *tempdir = NULL;
2240
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2241
const char *seckey = PATHDIR "/" SECKEY;
2242
const char *pubkey = PATHDIR "/" PUBKEY;
2243
char *interfaces_hooks = NULL;
2245
bool gnutls_initialized = false;
2246
bool gpgme_initialized = false;
2248
double retry_interval = 10; /* 10s between trying a server and
2249
retrying the same server again */
2251
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2252
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2257
/* Lower any group privileges we might have, just to be safe */
2261
perror_plus("setgid");
2264
/* Lower user privileges (temporarily) */
2268
perror_plus("seteuid");
2276
struct argp_option options[] = {
2277
{ .name = "debug", .key = 128,
2278
.doc = "Debug mode", .group = 3 },
2279
{ .name = "connect", .key = 'c',
2280
.arg = "ADDRESS:PORT",
2281
.doc = "Connect directly to a specific Mandos server",
2283
{ .name = "interface", .key = 'i',
2285
.doc = "Network interface that will be used to search for"
2288
{ .name = "seckey", .key = 's',
2290
.doc = "OpenPGP secret key file base name",
2292
{ .name = "pubkey", .key = 'p',
2294
.doc = "OpenPGP public key file base name",
2296
{ .name = "dh-bits", .key = 129,
2298
.doc = "Bit length of the prime number used in the"
2299
" Diffie-Hellman key exchange",
2301
{ .name = "priority", .key = 130,
2303
.doc = "GnuTLS priority string for the TLS handshake",
2305
{ .name = "delay", .key = 131,
2307
.doc = "Maximum delay to wait for interface startup",
2309
{ .name = "retry", .key = 132,
2311
.doc = "Retry interval used when denied by the Mandos server",
2313
{ .name = "network-hook-dir", .key = 133,
2315
.doc = "Directory where network hooks are located",
2318
* These reproduce what we would get without ARGP_NO_HELP
2320
{ .name = "help", .key = '?',
2321
.doc = "Give this help list", .group = -1 },
2322
{ .name = "usage", .key = -3,
2323
.doc = "Give a short usage message", .group = -1 },
2324
{ .name = "version", .key = 'V',
2325
.doc = "Print program version", .group = -1 },
2329
error_t parse_opt(int key, char *arg,
2330
struct argp_state *state){
2333
case 128: /* --debug */
2336
case 'c': /* --connect */
2339
case 'i': /* --interface */
2340
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2343
argp_error(state, "%s", strerror(ret_errno));
2346
case 's': /* --seckey */
2349
case 'p': /* --pubkey */
2352
case 129: /* --dh-bits */
2354
tmpmax = strtoimax(arg, &tmp, 10);
2355
if(errno != 0 or tmp == arg or *tmp != '\0'
2356
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2357
argp_error(state, "Bad number of DH bits");
2359
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2361
case 130: /* --priority */
2364
case 131: /* --delay */
2366
delay = strtof(arg, &tmp);
2367
if(errno != 0 or tmp == arg or *tmp != '\0'){
2368
argp_error(state, "Bad delay");
2370
case 132: /* --retry */
2372
retry_interval = strtod(arg, &tmp);
2373
if(errno != 0 or tmp == arg or *tmp != '\0'
2374
or (retry_interval * 1000) > INT_MAX
2375
or retry_interval < 0){
2376
argp_error(state, "Bad retry interval");
2379
case 133: /* --network-hook-dir */
2383
* These reproduce what we would get without ARGP_NO_HELP
2385
case '?': /* --help */
2386
argp_state_help(state, state->out_stream,
2387
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2388
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2389
case -3: /* --usage */
2390
argp_state_help(state, state->out_stream,
2391
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2392
case 'V': /* --version */
2393
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2394
exit(argp_err_exit_status);
2397
return ARGP_ERR_UNKNOWN;
2402
struct argp argp = { .options = options, .parser = parse_opt,
2404
.doc = "Mandos client -- Get and decrypt"
2405
" passwords from a Mandos server" };
2406
ret = argp_parse(&argp, argc, argv,
2407
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2414
perror_plus("argp_parse");
2415
exitcode = EX_OSERR;
2418
exitcode = EX_USAGE;
2424
/* Work around Debian bug #633582:
2425
<http://bugs.debian.org/633582> */
2427
/* Re-raise privileges */
2428
ret_errno = raise_privileges();
2431
perror_plus("Failed to raise privileges");
2435
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2436
int seckey_fd = open(seckey, O_RDONLY);
2437
if(seckey_fd == -1){
2438
perror_plus("open");
2440
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2442
perror_plus("fstat");
2444
if(S_ISREG(st.st_mode)
2445
and st.st_uid == 0 and st.st_gid == 0){
2446
ret = fchown(seckey_fd, uid, gid);
2448
perror_plus("fchown");
2452
TEMP_FAILURE_RETRY(close(seckey_fd));
2456
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2457
int pubkey_fd = open(pubkey, O_RDONLY);
2458
if(pubkey_fd == -1){
2459
perror_plus("open");
2461
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2463
perror_plus("fstat");
2465
if(S_ISREG(st.st_mode)
2466
and st.st_uid == 0 and st.st_gid == 0){
2467
ret = fchown(pubkey_fd, uid, gid);
2469
perror_plus("fchown");
2473
TEMP_FAILURE_RETRY(close(pubkey_fd));
2477
/* Lower privileges */
2478
ret_errno = lower_privileges();
2481
perror_plus("Failed to lower privileges");
2486
/* Remove invalid interface names (except "none") */
2488
char *interface = NULL;
2489
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2491
if(strcmp(interface, "none") != 0
2492
and if_nametoindex(interface) == 0){
2493
if(interface[0] != '\0'){
2494
fprintf_plus(stderr, "Not using nonexisting interface"
2495
" \"%s\"\n", interface);
2497
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2503
/* Run network hooks */
2505
if(mc.interfaces != NULL){
2506
interfaces_hooks = malloc(mc.interfaces_size);
2507
if(interfaces_hooks == NULL){
2508
perror_plus("malloc");
2511
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2512
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2514
run_network_hooks("start", interfaces_hooks != NULL ?
2515
interfaces_hooks : "", delay);
2519
avahi_set_log_function(empty_log);
2522
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2523
from the signal handler */
2524
/* Initialize the pseudo-RNG for Avahi */
2525
srand((unsigned int) time(NULL));
2526
simple_poll = avahi_simple_poll_new();
2527
if(simple_poll == NULL){
2528
fprintf_plus(stderr,
2529
"Avahi: Failed to create simple poll object.\n");
2530
exitcode = EX_UNAVAILABLE;
2534
sigemptyset(&sigterm_action.sa_mask);
2535
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2537
perror_plus("sigaddset");
2538
exitcode = EX_OSERR;
2541
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2543
perror_plus("sigaddset");
2544
exitcode = EX_OSERR;
2547
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2549
perror_plus("sigaddset");
2550
exitcode = EX_OSERR;
2553
/* Need to check if the handler is SIG_IGN before handling:
2554
| [[info:libc:Initial Signal Actions]] |
2555
| [[info:libc:Basic Signal Handling]] |
2557
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2559
perror_plus("sigaction");
2562
if(old_sigterm_action.sa_handler != SIG_IGN){
2563
ret = sigaction(SIGINT, &sigterm_action, NULL);
2565
perror_plus("sigaction");
2566
exitcode = EX_OSERR;
2570
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2572
perror_plus("sigaction");
2575
if(old_sigterm_action.sa_handler != SIG_IGN){
2576
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2578
perror_plus("sigaction");
2579
exitcode = EX_OSERR;
2583
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2585
perror_plus("sigaction");
2588
if(old_sigterm_action.sa_handler != SIG_IGN){
2589
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2591
perror_plus("sigaction");
2592
exitcode = EX_OSERR;
2597
/* If no interfaces were specified, make a list */
2598
if(mc.interfaces == NULL){
2599
struct dirent **direntries = NULL;
2600
/* Look for any good interfaces */
2601
ret = scandir(sys_class_net, &direntries, good_interface,
2604
/* Add all found interfaces to interfaces list */
2605
for(int i = 0; i < ret; ++i){
2606
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2607
direntries[i]->d_name);
2610
perror_plus("argz_add");
2611
free(direntries[i]);
2615
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2616
direntries[i]->d_name);
2618
free(direntries[i]);
2625
fprintf_plus(stderr, "Could not find a network interface\n");
722
AvahiSServiceBrowser *sb = NULL;
725
int exitcode = EXIT_SUCCESS;
726
const char *interface = "eth0";
727
struct ifreq network;
731
char *connect_to = NULL;
732
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
733
const char *pubkeyfile = "pubkey.txt";
734
const char *seckeyfile = "seckey.txt";
735
mandos_context mc = { .simple_poll = NULL, .server = NULL,
736
.dh_bits = 1024, .priority = "SECURE256"};
739
struct argp_option options[] = {
740
{ .name = "debug", .key = 128,
741
.doc = "Debug mode", .group = 3 },
742
{ .name = "connect", .key = 'c',
744
.doc = "Connect directly to a sepcified mandos server", .group = 1 },
745
{ .name = "interface", .key = 'i',
747
.doc = "Interface that Avahi will conntect through", .group = 1 },
748
{ .name = "keydir", .key = 'd',
750
.doc = "Directory where the openpgp keyring is", .group = 1 },
751
{ .name = "seckey", .key = 's',
753
.doc = "Secret openpgp key for gnutls authentication", .group = 1 },
754
{ .name = "pubkey", .key = 'p',
756
.doc = "Public openpgp key for gnutls authentication", .group = 2 },
757
{ .name = "dh-bits", .key = 129,
759
.doc = "dh-bits to use in gnutls communication", .group = 2 },
760
{ .name = "priority", .key = 130,
762
.doc = "GNUTLS priority", .group = 1 },
767
error_t parse_opt (int key, char *arg, struct argp_state *state) {
768
/* Get the INPUT argument from `argp_parse', which we know is a
769
pointer to our plugin list pointer. */
791
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
806
return ARGP_ERR_UNKNOWN;
811
struct argp argp = { .options = options, .parser = parse_opt,
813
.doc = "Mandos client -- Get and decrypt passwords from mandos server" };
814
argp_parse (&argp, argc, argv, 0, 0, NULL);
817
pubkeyfile = combinepath(keydir, pubkeyfile);
818
if (pubkeyfile == NULL){
819
perror("combinepath");
2626
820
exitcode = EXIT_FAILURE;
2631
/* Bring up interfaces which are down, and remove any "none"s */
2633
char *interface = NULL;
2634
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2636
/* If interface name is "none", stop bringing up interfaces.
2637
Also remove all instances of "none" from the list */
2638
if(strcmp(interface, "none") == 0){
2639
argz_delete(&mc.interfaces, &mc.interfaces_size,
2642
while((interface = argz_next(mc.interfaces,
2643
mc.interfaces_size, interface))){
2644
if(strcmp(interface, "none") == 0){
2645
argz_delete(&mc.interfaces, &mc.interfaces_size,
2652
bool interface_was_up = interface_is_up(interface);
2653
errno = bring_up_interface(interface, delay);
2654
if(not interface_was_up){
2656
perror_plus("Failed to bring up interface");
2658
errno = argz_add(&interfaces_to_take_down,
2659
&interfaces_to_take_down_size,
2662
perror_plus("argz_add");
2667
if(debug and (interfaces_to_take_down == NULL)){
2668
fprintf_plus(stderr, "No interfaces were brought up\n");
2672
/* If we only got one interface, explicitly use only that one */
2673
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2675
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2678
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2685
ret = init_gnutls_global(pubkey, seckey, &mc);
2687
fprintf_plus(stderr, "init_gnutls_global failed\n");
2688
exitcode = EX_UNAVAILABLE;
2691
gnutls_initialized = true;
2698
/* Try /run/tmp before /tmp */
2699
tempdir = mkdtemp(run_tempdir);
2700
if(tempdir == NULL and errno == ENOENT){
2702
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2703
run_tempdir, old_tempdir);
2705
tempdir = mkdtemp(old_tempdir);
2707
if(tempdir == NULL){
2708
perror_plus("mkdtemp");
2716
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2717
fprintf_plus(stderr, "init_gpgme failed\n");
2718
exitcode = EX_UNAVAILABLE;
2721
gpgme_initialized = true;
2728
if(connect_to != NULL){
2729
/* Connect directly, do not use Zeroconf */
2730
/* (Mainly meant for debugging) */
2731
char *address = strrchr(connect_to, ':');
2733
if(address == NULL){
2734
fprintf_plus(stderr, "No colon in address\n");
2735
exitcode = EX_USAGE;
2745
tmpmax = strtoimax(address+1, &tmp, 10);
2746
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2747
or tmpmax != (in_port_t)tmpmax){
2748
fprintf_plus(stderr, "Bad port number\n");
2749
exitcode = EX_USAGE;
2757
port = (in_port_t)tmpmax;
2759
/* Colon in address indicates IPv6 */
2761
if(strchr(connect_to, ':') != NULL){
2763
/* Accept [] around IPv6 address - see RFC 5952 */
2764
if(connect_to[0] == '[' and address[-1] == ']')
2772
address = connect_to;
2778
while(not quit_now){
2779
ret = start_mandos_communication(address, port, if_index, af,
2781
if(quit_now or ret == 0){
2785
fprintf_plus(stderr, "Retrying in %d seconds\n",
2786
(int)retry_interval);
2788
sleep((unsigned int)retry_interval);
2792
exitcode = EXIT_SUCCESS;
2803
AvahiServerConfig config;
2804
/* Do not publish any local Zeroconf records */
2805
avahi_server_config_init(&config);
2806
config.publish_hinfo = 0;
2807
config.publish_addresses = 0;
2808
config.publish_workstation = 0;
2809
config.publish_domain = 0;
2811
/* Allocate a new server */
2812
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2813
&config, NULL, NULL, &ret_errno);
2815
/* Free the Avahi configuration data */
2816
avahi_server_config_free(&config);
2819
/* Check if creating the Avahi server object succeeded */
2820
if(mc.server == NULL){
2821
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2822
avahi_strerror(ret_errno));
2823
exitcode = EX_UNAVAILABLE;
2831
/* Create the Avahi service browser */
2832
sb = avahi_s_service_browser_new(mc.server, if_index,
2833
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2834
NULL, 0, browse_callback,
2837
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2838
avahi_strerror(avahi_server_errno(mc.server)));
2839
exitcode = EX_UNAVAILABLE;
2847
/* Run the main loop */
2850
fprintf_plus(stderr, "Starting Avahi loop search\n");
2853
ret = avahi_loop_with_timeout(simple_poll,
2854
(int)(retry_interval * 1000), &mc);
2856
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2857
(ret == 0) ? "successfully" : "with error");
824
seckeyfile = combinepath(keydir, seckeyfile);
825
if (seckeyfile == NULL){
826
perror("combinepath");
830
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
832
fprintf(stderr, "init_gnutls_global\n");
849
if_index = (AvahiIfIndex) if_nametoindex(interface);
851
fprintf(stderr, "No such interface: \"%s\"\n", interface);
855
if(connect_to != NULL){
856
/* Connect directly, do not use Zeroconf */
857
/* (Mainly meant for debugging) */
858
char *address = strrchr(connect_to, ':');
860
fprintf(stderr, "No colon in address\n");
861
exitcode = EXIT_FAILURE;
865
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
867
perror("Bad port number");
868
exitcode = EXIT_FAILURE;
872
address = connect_to;
873
ret = start_mandos_communication(address, port, if_index, &mc);
875
exitcode = EXIT_FAILURE;
877
exitcode = EXIT_SUCCESS;
882
/* If the interface is down, bring it up */
884
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
887
exitcode = EXIT_FAILURE;
890
strcpy(network.ifr_name, interface); /* Spurious warning */
891
ret = ioctl(sd, SIOCGIFFLAGS, &network);
893
perror("ioctl SIOCGIFFLAGS");
894
exitcode = EXIT_FAILURE;
897
if((network.ifr_flags & IFF_UP) == 0){
898
network.ifr_flags |= IFF_UP;
899
ret = ioctl(sd, SIOCSIFFLAGS, &network);
901
perror("ioctl SIOCSIFFLAGS");
902
exitcode = EXIT_FAILURE;
910
avahi_set_log_function(empty_log);
913
/* Initialize the pseudo-RNG for Avahi */
914
srand((unsigned int) time(NULL));
916
/* Allocate main Avahi loop object */
917
mc.simple_poll = avahi_simple_poll_new();
918
if (mc.simple_poll == NULL) {
919
fprintf(stderr, "Avahi: Failed to create simple poll"
921
exitcode = EXIT_FAILURE;
926
AvahiServerConfig config;
927
/* Do not publish any local Zeroconf records */
928
avahi_server_config_init(&config);
929
config.publish_hinfo = 0;
930
config.publish_addresses = 0;
931
config.publish_workstation = 0;
932
config.publish_domain = 0;
934
/* Allocate a new server */
935
mc.server = avahi_server_new(avahi_simple_poll_get
936
(mc.simple_poll), &config, NULL,
939
/* Free the Avahi configuration data */
940
avahi_server_config_free(&config);
943
/* Check if creating the Avahi server object succeeded */
944
if (mc.server == NULL) {
945
fprintf(stderr, "Failed to create Avahi server: %s\n",
946
avahi_strerror(error));
947
exitcode = EXIT_FAILURE;
951
/* Create the Avahi service browser */
952
sb = avahi_s_service_browser_new(mc.server, if_index,
954
"_mandos._tcp", NULL, 0,
955
browse_callback, &mc);
957
fprintf(stderr, "Failed to create service browser: %s\n",
958
avahi_strerror(avahi_server_errno(mc.server)));
959
exitcode = EXIT_FAILURE;
963
/* Run the main loop */
966
fprintf(stderr, "Starting Avahi loop search\n");
969
avahi_simple_poll_loop(mc.simple_poll);
2863
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2866
/* Cleanup things */
2867
free(mc.interfaces);
2870
avahi_s_service_browser_free(sb);
2872
if(mc.server != NULL)
2873
avahi_server_free(mc.server);
2875
if(simple_poll != NULL)
2876
avahi_simple_poll_free(simple_poll);
2878
if(gnutls_initialized){
2879
gnutls_certificate_free_credentials(mc.cred);
2880
gnutls_global_deinit();
2881
gnutls_dh_params_deinit(mc.dh_params);
2884
if(gpgme_initialized){
2885
gpgme_release(mc.ctx);
2888
/* Cleans up the circular linked list of Mandos servers the client
2890
if(mc.current_server != NULL){
2891
mc.current_server->prev->next = NULL;
2892
while(mc.current_server != NULL){
2893
server *next = mc.current_server->next;
2895
#pragma GCC diagnostic push
2896
#pragma GCC diagnostic ignored "-Wcast-qual"
2898
free((char *)(mc.current_server->ip));
2900
#pragma GCC diagnostic pop
2902
free(mc.current_server);
2903
mc.current_server = next;
2907
/* Re-raise privileges */
2909
ret_errno = raise_privileges();
2912
perror_plus("Failed to raise privileges");
2915
/* Run network hooks */
2916
run_network_hooks("stop", interfaces_hooks != NULL ?
2917
interfaces_hooks : "", delay);
2919
/* Take down the network interfaces which were brought up */
2921
char *interface = NULL;
2922
while((interface=argz_next(interfaces_to_take_down,
2923
interfaces_to_take_down_size,
2925
ret_errno = take_down_interface(interface);
2928
perror_plus("Failed to take down interface");
2931
if(debug and (interfaces_to_take_down == NULL)){
2932
fprintf_plus(stderr, "No interfaces needed to be taken"
2938
ret_errno = lower_privileges_permanently();
2941
perror_plus("Failed to lower privileges permanently");
2945
free(interfaces_to_take_down);
2946
free(interfaces_hooks);
2948
/* Removes the GPGME temp directory and all files inside */
2949
if(tempdir != NULL){
2950
struct dirent **direntries = NULL;
2951
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY
2955
if(tempdir_fd == -1){
2956
perror_plus("open");
2959
#if __GLIBC_PREREQ(2, 15)
2960
int numentries = scandirat(tempdir_fd, ".", &direntries,
2961
notdotentries, alphasort);
2962
#else /* not __GLIBC_PREREQ(2, 15) */
2963
int numentries = scandir(tempdir, &direntries, notdotentries,
2965
#endif /* not __GLIBC_PREREQ(2, 15) */
2966
#else /* not __GLIBC__ */
2967
int numentries = scandir(tempdir, &direntries, notdotentries,
2969
#endif /* not __GLIBC__ */
2970
if(numentries >= 0){
2971
for(int i = 0; i < numentries; i++){
2972
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2974
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2975
" \"%s\", 0): %s\n", tempdir,
2976
direntries[i]->d_name, strerror(errno));
2978
free(direntries[i]);
2981
/* need to clean even if 0 because man page doesn't specify */
2983
if(numentries == -1){
2984
perror_plus("scandir");
2986
ret = rmdir(tempdir);
2987
if(ret == -1 and errno != ENOENT){
2988
perror_plus("rmdir");
2991
TEMP_FAILURE_RETRY(close(tempdir_fd));
2996
sigemptyset(&old_sigterm_action.sa_mask);
2997
old_sigterm_action.sa_handler = SIG_DFL;
2998
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2999
&old_sigterm_action,
3002
perror_plus("sigaction");
3005
ret = raise(signal_received);
3006
} while(ret != 0 and errno == EINTR);
3008
perror_plus("raise");
3011
TEMP_FAILURE_RETRY(pause());
974
fprintf(stderr, "%s exiting\n", argv[0]);
979
avahi_s_service_browser_free(sb);
981
if (mc.server != NULL)
982
avahi_server_free(mc.server);
984
if (mc.simple_poll != NULL)
985
avahi_simple_poll_free(mc.simple_poll);