51
116
#include <avahi-common/malloc.h>
52
117
#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 */
120
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
123
init_gnutls_session(),
125
#include <gnutls/openpgp.h>
126
/* gnutls_certificate_set_openpgp_key_file(),
127
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() */
130
#include <gpgme.h> /* All GPGME types, constants and
133
GPGME_PROTOCOL_OpenPGP,
75
136
#define BUFFER_SIZE 256
138
#define PATHDIR "/conf/conf.d/mandos"
139
#define SECKEY "seckey.txt"
140
#define PUBKEY "pubkey.txt"
141
#define HOOKDIR "/lib/mandos/network-hooks.d"
77
143
bool debug = false;
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 */
144
static const char mandos_protocol_version[] = "1";
145
const char *argp_program_version = "mandos-client " VERSION;
146
const char *argp_program_bug_address = "<mandos@recompile.se>";
147
static const char sys_class_net[] = "/sys/class/net";
148
char *connect_to = NULL;
149
const char *hookdir = HOOKDIR;
154
/* Doubly linked list that need to be circularly linked when used */
155
typedef struct server{
158
AvahiIfIndex if_index;
160
struct timespec last_seen;
165
/* Used for passing in values through the Avahi callback functions */
85
AvahiSimplePoll *simple_poll;
86
167
AvahiServer *server;
87
168
gnutls_certificate_credentials_t cred;
88
169
unsigned int dh_bits;
89
170
gnutls_dh_params_t dh_params;
90
171
const char *priority;
173
server *current_server;
175
size_t interfaces_size;
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);
178
/* global so signal handler can reach it*/
179
AvahiSimplePoll *simple_poll;
181
sig_atomic_t quit_now = 0;
182
int signal_received = 0;
184
/* Function to use when printing errors */
185
void perror_plus(const char *print_text){
187
fprintf(stderr, "Mandos plugin %s: ",
188
program_invocation_short_name);
193
__attribute__((format (gnu_printf, 2, 3), nonnull))
194
int fprintf_plus(FILE *stream, const char *format, ...){
196
va_start (ap, format);
198
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
199
program_invocation_short_name));
200
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
204
* Make additional room in "buffer" for at least BUFFER_SIZE more
205
* bytes. "buffer_capacity" is how much is currently allocated,
206
* "buffer_length" is how much is already used.
208
__attribute__((nonnull, warn_unused_result))
209
size_t incbuffer(char **buffer, size_t buffer_length,
210
size_t buffer_capacity){
211
if(buffer_length + BUFFER_SIZE > buffer_capacity){
212
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
214
int old_errno = errno;
100
221
buffer_capacity += BUFFER_SIZE;
102
223
return buffer_capacity;
226
/* Add server to set of servers to retry periodically */
227
__attribute__((nonnull, warn_unused_result))
228
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
229
int af, server **current_server){
231
server *new_server = malloc(sizeof(server));
232
if(new_server == NULL){
233
perror_plus("malloc");
236
*new_server = (server){ .ip = strdup(ip),
238
.if_index = if_index,
240
if(new_server->ip == NULL){
241
perror_plus("strdup");
245
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
247
perror_plus("clock_gettime");
249
#pragma GCC diagnostic push
250
#pragma GCC diagnostic ignored "-Wcast-qual"
252
free((char *)(new_server->ip));
254
#pragma GCC diagnostic pop
259
/* Special case of first server */
260
if(*current_server == NULL){
261
new_server->next = new_server;
262
new_server->prev = new_server;
263
*current_server = new_server;
265
/* Place the new server last in the list */
266
new_server->next = *current_server;
267
new_server->prev = (*current_server)->prev;
268
new_server->prev->next = new_server;
269
(*current_server)->prev = new_server;
106
* Decrypt OpenPGP data using keyrings in HOMEDIR.
107
* Returns -1 on error
109
static ssize_t pgp_packet_decrypt (const char *cryptotext,
112
const char *homedir){
113
gpgme_data_t dh_crypto, dh_plain;
277
__attribute__((nonnull, warn_unused_result))
278
static bool init_gpgme(const char * const seckey,
279
const char * const pubkey,
280
const char * const tempdir,
115
282
gpgme_error_t rc;
117
size_t plaintext_capacity = 0;
118
ssize_t plaintext_length = 0;
119
283
gpgme_engine_info_t engine_info;
122
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
286
* Helper function to insert pub and seckey to the engine keyring.
288
bool import_key(const char * const filename){
291
gpgme_data_t pgp_data;
293
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
299
rc = gpgme_data_new_from_fd(&pgp_data, fd);
300
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
306
rc = gpgme_op_import(mc->ctx, pgp_data);
307
if(rc != GPG_ERR_NO_ERROR){
308
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
309
gpgme_strsource(rc), gpgme_strerror(rc));
315
perror_plus("close");
317
gpgme_data_release(pgp_data);
322
fprintf_plus(stderr, "Initializing GPGME\n");
126
326
gpgme_check_version(NULL);
127
327
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
328
if(rc != GPG_ERR_NO_ERROR){
329
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
330
gpgme_strsource(rc), gpgme_strerror(rc));
134
334
/* Set GPGME home directory for the OpenPGP engine only */
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));
335
rc = gpgme_get_engine_info(&engine_info);
336
if(rc != GPG_ERR_NO_ERROR){
337
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
338
gpgme_strsource(rc), gpgme_strerror(rc));
141
341
while(engine_info != NULL){
142
342
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
143
343
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
144
engine_info->file_name, homedir);
344
engine_info->file_name, tempdir);
147
347
engine_info = engine_info->next;
149
349
if(engine_info == NULL){
150
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
350
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
355
/* Create new GPGME "context" */
356
rc = gpgme_new(&(mc->ctx));
357
if(rc != GPG_ERR_NO_ERROR){
358
fprintf_plus(stderr, "Mandos plugin mandos-client: "
359
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
364
if(not import_key(pubkey) or not import_key(seckey)){
372
* Decrypt OpenPGP data.
373
* Returns -1 on error
375
__attribute__((nonnull, warn_unused_result))
376
static ssize_t pgp_packet_decrypt(const char *cryptotext,
380
gpgme_data_t dh_crypto, dh_plain;
383
size_t plaintext_capacity = 0;
384
ssize_t plaintext_length = 0;
387
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
154
390
/* Create new GPGME data buffer from memory cryptotext */
155
391
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
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));
393
if(rc != GPG_ERR_NO_ERROR){
394
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
395
gpgme_strsource(rc), gpgme_strerror(rc));
163
399
/* Create new empty GPGME data buffer for the plaintext */
164
400
rc = gpgme_data_new(&dh_plain);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
401
if(rc != GPG_ERR_NO_ERROR){
402
fprintf_plus(stderr, "Mandos plugin mandos-client: "
403
"bad gpgme_data_new: %s: %s\n",
404
gpgme_strsource(rc), gpgme_strerror(rc));
168
405
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;
181
409
/* Decrypt data from the cryptotext data buffer to the plaintext
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));
411
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
412
if(rc != GPG_ERR_NO_ERROR){
413
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
414
gpgme_strsource(rc), gpgme_strerror(rc));
187
415
plaintext_length = -1;
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;
417
gpgme_decrypt_result_t result;
418
result = gpgme_op_decrypt_result(mc->ctx);
420
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
422
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
423
result->unsupported_algorithm);
424
fprintf_plus(stderr, "Wrong key usage: %u\n",
425
result->wrong_key_usage);
426
if(result->file_name != NULL){
427
fprintf_plus(stderr, "File name: %s\n", result->file_name);
429
gpgme_recipient_t recipient;
430
recipient = result->recipients;
211
431
while(recipient != NULL){
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
432
fprintf_plus(stderr, "Public key algorithm: %s\n",
433
gpgme_pubkey_algo_name
434
(recipient->pubkey_algo));
435
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
436
fprintf_plus(stderr, "Secret key available: %s\n",
437
recipient->status == GPG_ERR_NO_SECKEY
218
439
recipient = recipient->next;
447
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
224
450
/* Seek back to the beginning of the GPGME plaintext data buffer */
225
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
226
perror("pgpme_data_seek");
451
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
452
perror_plus("gpgme_data_seek");
227
453
plaintext_length = -1;
228
454
goto decrypt_end;
231
457
*plaintext = NULL;
233
plaintext_capacity = adjustbuffer(plaintext, (size_t)plaintext_length,
235
if (plaintext_capacity == 0){
236
perror("adjustbuffer");
237
plaintext_length = -1;
459
plaintext_capacity = incbuffer(plaintext,
460
(size_t)plaintext_length,
462
if(plaintext_capacity == 0){
463
perror_plus("incbuffer");
464
plaintext_length = -1;
241
468
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
243
470
/* Print the data, if any */
249
perror("gpgme_data_read");
476
perror_plus("gpgme_data_read");
250
477
plaintext_length = -1;
251
478
goto decrypt_end;
253
480
plaintext_length += ret;
257
fprintf(stderr, "Decrypted password is: ");
484
fprintf_plus(stderr, "Decrypted password is: ");
258
485
for(ssize_t i = 0; i < plaintext_length; i++){
259
486
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
311
541
/* OpenPGP credentials */
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));
542
ret = gnutls_certificate_allocate_credentials(&mc->cred);
543
if(ret != GNUTLS_E_SUCCESS){
544
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
545
safer_gnutls_strerror(ret));
320
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
321
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
550
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
551
" secret key %s as GnuTLS credentials\n",
325
556
ret = gnutls_certificate_set_openpgp_key_file
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));
557
(mc->cred, pubkeyfilename, seckeyfilename,
558
GNUTLS_OPENPGP_FMT_BASE64);
559
if(ret != GNUTLS_E_SUCCESS){
561
"Error[%d] while reading the OpenPGP key pair ('%s',"
562
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
563
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
564
safer_gnutls_strerror(ret));
336
568
/* GnuTLS server initialization */
337
569
ret = gnutls_dh_params_init(&mc->dh_params);
338
if (ret != GNUTLS_E_SUCCESS) {
339
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
340
" %s\n", safer_gnutls_strerror(ret));
343
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
344
if (ret != GNUTLS_E_SUCCESS) {
345
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
346
safer_gnutls_strerror(ret));
570
if(ret != GNUTLS_E_SUCCESS){
571
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
572
" initialization: %s\n",
573
safer_gnutls_strerror(ret));
576
/* If a Diffie-Hellman parameters file was given, try to use it */
577
if(dhparamsfilename != NULL){
578
gnutls_datum_t params = { .data = NULL, .size = 0 };
580
int dhpfile = open(dhparamsfilename, O_RDONLY);
583
dhparamsfilename = NULL;
586
size_t params_capacity = 0;
588
params_capacity = incbuffer((char **)¶ms.data,
590
(size_t)params_capacity);
591
if(params_capacity == 0){
592
perror_plus("incbuffer");
595
dhparamsfilename = NULL;
598
ssize_t bytes_read = read(dhpfile,
599
params.data + params.size,
605
/* check bytes_read for failure */
610
dhparamsfilename = NULL;
613
params.size += (unsigned int)bytes_read;
615
if(params.data == NULL){
616
dhparamsfilename = NULL;
618
if(dhparamsfilename == NULL){
621
ret = gnutls_dh_params_import_pkcs3(mc->dh_params, ¶ms,
622
GNUTLS_X509_FMT_PEM);
623
if(ret != GNUTLS_E_SUCCESS){
624
fprintf_plus(stderr, "Failed to parse DH parameters in file"
625
" \"%s\": %s\n", dhparamsfilename,
626
safer_gnutls_strerror(ret));
627
dhparamsfilename = NULL;
631
if(dhparamsfilename == NULL){
632
if(mc->dh_bits == 0){
633
/* Find out the optimal number of DH bits */
634
/* Try to read the private key file */
635
gnutls_datum_t buffer = { .data = NULL, .size = 0 };
637
int secfile = open(seckeyfilename, O_RDONLY);
642
size_t buffer_capacity = 0;
644
buffer_capacity = incbuffer((char **)&buffer.data,
646
(size_t)buffer_capacity);
647
if(buffer_capacity == 0){
648
perror_plus("incbuffer");
653
ssize_t bytes_read = read(secfile,
654
buffer.data + buffer.size,
660
/* check bytes_read for failure */
667
buffer.size += (unsigned int)bytes_read;
671
/* If successful, use buffer to parse private key */
672
gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;
673
if(buffer.data != NULL){
675
gnutls_openpgp_privkey_t privkey = NULL;
676
ret = gnutls_openpgp_privkey_init(&privkey);
677
if(ret != GNUTLS_E_SUCCESS){
678
fprintf_plus(stderr, "Error initializing OpenPGP key"
680
safer_gnutls_strerror(ret));
684
ret = gnutls_openpgp_privkey_import
685
(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);
686
if(ret != GNUTLS_E_SUCCESS){
687
fprintf_plus(stderr, "Error importing OpenPGP key : %s",
688
safer_gnutls_strerror(ret));
694
/* Use private key to suggest an appropriate
696
sec_param = gnutls_openpgp_privkey_sec_param(privkey);
697
gnutls_openpgp_privkey_deinit(privkey);
699
fprintf_plus(stderr, "This OpenPGP key implies using"
700
" a GnuTLS security parameter \"%s\".\n",
701
safe_string(gnutls_sec_param_get_name
707
if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){
708
/* Err on the side of caution */
709
sec_param = GNUTLS_SEC_PARAM_ULTRA;
711
fprintf_plus(stderr, "Falling back to security parameter"
713
safe_string(gnutls_sec_param_get_name
718
uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);
722
fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"
723
" implies %u DH bits; using that.\n",
724
safe_string(gnutls_sec_param_get_name
729
fprintf_plus(stderr, "Failed to get implied number of DH"
730
" bits for security parameter \"%s\"): %s\n",
731
safe_string(gnutls_sec_param_get_name
733
safer_gnutls_strerror(ret));
737
fprintf_plus(stderr, "DH bits explicitly set to %u\n",
740
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
741
if(ret != GNUTLS_E_SUCCESS){
742
fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"
743
" bits): %s\n", mc->dh_bits,
744
safer_gnutls_strerror(ret));
350
748
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
754
gnutls_certificate_free_credentials(mc->cred);
755
gnutls_dh_params_deinit(mc->dh_params);
355
static int init_gnutls_session(mandos_context *mc, gnutls_session_t *session){
759
__attribute__((nonnull, warn_unused_result))
760
static int init_gnutls_session(gnutls_session_t *session,
357
763
/* GnuTLS session creation */
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));
765
ret = gnutls_init(session, GNUTLS_SERVER);
769
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
770
if(ret != GNUTLS_E_SUCCESS){
772
"Error in GnuTLS session initialization: %s\n",
773
safer_gnutls_strerror(ret));
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));
779
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
781
gnutls_deinit(*session);
784
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
785
if(ret != GNUTLS_E_SUCCESS){
786
fprintf_plus(stderr, "Syntax error at: %s\n", err);
787
fprintf_plus(stderr, "GnuTLS error: %s\n",
788
safer_gnutls_strerror(ret));
789
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));
795
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
798
gnutls_deinit(*session);
801
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
802
if(ret != GNUTLS_E_SUCCESS){
803
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
804
safer_gnutls_strerror(ret));
805
gnutls_deinit(*session);
383
809
/* ignore client certificate if any. */
384
gnutls_certificate_server_set_request (*session,
387
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
810
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
393
816
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
394
817
__attribute__((unused)) const char *txt){}
819
/* Set effective uid to 0, return errno */
820
__attribute__((warn_unused_result))
821
int raise_privileges(void){
822
int old_errno = errno;
824
if(seteuid(0) == -1){
831
/* Set effective and real user ID to 0. Return errno. */
832
__attribute__((warn_unused_result))
833
int raise_privileges_permanently(void){
834
int old_errno = errno;
835
int ret = raise_privileges();
847
/* Set effective user ID to unprivileged saved user ID */
848
__attribute__((warn_unused_result))
849
int lower_privileges(void){
850
int old_errno = errno;
852
if(seteuid(uid) == -1){
859
/* Lower privileges permanently */
860
__attribute__((warn_unused_result))
861
int lower_privileges_permanently(void){
862
int old_errno = errno;
864
if(setuid(uid) == -1){
871
/* Helper function to add_local_route() and delete_local_route() */
872
__attribute__((nonnull, warn_unused_result))
873
static bool add_delete_local_route(const bool add,
875
AvahiIfIndex if_index){
877
char helper[] = "mandos-client-iprouteadddel";
878
char add_arg[] = "add";
879
char delete_arg[] = "delete";
880
char debug_flag[] = "--debug";
881
char *pluginhelperdir = getenv("MANDOSPLUGINHELPERDIR");
882
if(pluginhelperdir == NULL){
884
fprintf_plus(stderr, "MANDOSPLUGINHELPERDIR environment"
885
" variable not set; cannot run helper\n");
890
char interface[IF_NAMESIZE];
891
if(if_indextoname((unsigned int)if_index, interface) == NULL){
892
perror_plus("if_indextoname");
896
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
898
perror_plus("open(\"/dev/null\", O_RDONLY)");
904
/* Raise privileges */
905
errno = raise_privileges_permanently();
907
perror_plus("Failed to raise privileges");
908
/* _exit(EX_NOPERM); */
914
perror_plus("setgid");
917
/* Reset supplementary groups */
919
ret = setgroups(0, NULL);
921
perror_plus("setgroups");
925
ret = dup2(devnull, STDIN_FILENO);
927
perror_plus("dup2(devnull, STDIN_FILENO)");
930
ret = close(devnull);
932
perror_plus("close");
935
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
937
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
940
int helperdir_fd = (int)TEMP_FAILURE_RETRY(open(pluginhelperdir,
945
if(helperdir_fd == -1){
947
_exit(EX_UNAVAILABLE);
949
int helper_fd = (int)TEMP_FAILURE_RETRY(openat(helperdir_fd,
952
perror_plus("openat");
954
_exit(EX_UNAVAILABLE);
958
#pragma GCC diagnostic push
959
#pragma GCC diagnostic ignored "-Wcast-qual"
961
if(fexecve(helper_fd, (char *const [])
962
{ helper, add ? add_arg : delete_arg, (char *)address,
963
interface, debug ? debug_flag : NULL, NULL },
966
#pragma GCC diagnostic pop
968
perror_plus("fexecve");
980
pret = waitpid(pid, &status, 0);
981
if(pret == -1 and errno == EINTR and quit_now){
982
int errno_raising = 0;
983
if((errno = raise_privileges()) != 0){
984
errno_raising = errno;
985
perror_plus("Failed to raise privileges in order to"
986
" kill helper program");
988
if(kill(pid, SIGTERM) == -1){
991
if((errno_raising == 0) and (errno = lower_privileges()) != 0){
992
perror_plus("Failed to lower privileges after killing"
997
} while(pret == -1 and errno == EINTR);
999
perror_plus("waitpid");
1002
if(WIFEXITED(status)){
1003
if(WEXITSTATUS(status) != 0){
1004
fprintf_plus(stderr, "Error: iprouteadddel exited"
1005
" with status %d\n", WEXITSTATUS(status));
1010
if(WIFSIGNALED(status)){
1011
fprintf_plus(stderr, "Error: iprouteadddel died by"
1012
" signal %d\n", WTERMSIG(status));
1015
fprintf_plus(stderr, "Error: iprouteadddel crashed\n");
1019
__attribute__((nonnull, warn_unused_result))
1020
static bool add_local_route(const char *address,
1021
AvahiIfIndex if_index){
1023
fprintf_plus(stderr, "Adding route to %s\n", address);
1025
return add_delete_local_route(true, address, if_index);
1028
__attribute__((nonnull, warn_unused_result))
1029
static bool delete_local_route(const char *address,
1030
AvahiIfIndex if_index){
1032
fprintf_plus(stderr, "Removing route to %s\n", address);
1034
return add_delete_local_route(false, address, if_index);
396
1037
/* Called when a Mandos server is found */
397
static int start_mandos_communication(const char *ip, uint16_t port,
1038
__attribute__((nonnull, warn_unused_result))
1039
static int start_mandos_communication(const char *ip, in_port_t port,
398
1040
AvahiIfIndex if_index,
401
struct sockaddr_in6 to;
1041
int af, mandos_context *mc){
1042
int ret, tcp_sd = -1;
1044
struct sockaddr_storage to;
402
1045
char *buffer = NULL;
403
char *decrypted_buffer;
1046
char *decrypted_buffer = NULL;
404
1047
size_t buffer_length = 0;
405
1048
size_t buffer_capacity = 0;
406
ssize_t decrypted_buffer_size;
409
char interface[IF_NAMESIZE];
410
1051
gnutls_session_t session;
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");
1052
int pf; /* Protocol family */
1053
bool route_added = false;
1070
fprintf_plus(stderr, "Bad address family: %d\n", af);
1075
/* If the interface is specified and we have a list of interfaces */
1076
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
1077
/* Check if the interface is one of the interfaces we are using */
1080
char *interface = NULL;
1081
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
1083
if(if_nametoindex(interface) == (unsigned int)if_index){
1090
/* This interface does not match any in the list, so we don't
1091
connect to the server */
1093
char interface[IF_NAMESIZE];
1094
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1095
perror_plus("if_indextoname");
1097
fprintf_plus(stderr, "Skipping server on non-used interface"
1099
if_indextoname((unsigned int)if_index,
434
fprintf(stderr, "Binding to interface %s\n", interface);
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);
1107
ret = init_gnutls_session(&session, mc);
1113
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
1114
PRIuMAX "\n", ip, (uintmax_t)port);
1117
tcp_sd = socket(pf, SOCK_STREAM | SOCK_CLOEXEC, 0);
1120
perror_plus("socket");
1131
struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;
1132
*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };
1133
ret = inet_pton(af, ip, &to6->sin6_addr);
1135
struct sockaddr_in *to4 = (struct sockaddr_in *)&to;
1136
*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };
1137
ret = inet_pton(af, ip, &to4->sin_addr);
1141
perror_plus("inet_pton");
447
fprintf(stderr, "Bad address: %s\n", ip);
450
to.sin6_port = htons(port); /* Spurious warning */
1147
fprintf_plus(stderr, "Bad address: %s\n", ip);
1152
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
1153
if(IN6_IS_ADDR_LINKLOCAL
1154
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
1155
if(if_index == AVAHI_IF_UNSPEC){
1156
fprintf_plus(stderr, "An IPv6 link-local address is"
1157
" incomplete without a network interface\n");
1161
/* Set the network interface number as scope */
1162
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
1165
((struct sockaddr_in *)&to)->sin_port = htons(port);
452
to.sin6_scope_id = (uint32_t)if_index;
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));
1174
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
1175
char interface[IF_NAMESIZE];
1176
if(if_indextoname((unsigned int)if_index, interface) == NULL){
1177
perror_plus("if_indextoname");
1179
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
1180
"\n", ip, interface, (uintmax_t)port);
1183
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
1184
ip, (uintmax_t)port);
1186
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
1187
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
1189
ret = getnameinfo((struct sockaddr *)&to,
1190
sizeof(struct sockaddr_in6),
1191
addrstr, sizeof(addrstr), NULL, 0,
1194
ret = getnameinfo((struct sockaddr *)&to,
1195
sizeof(struct sockaddr_in),
1196
addrstr, sizeof(addrstr), NULL, 0,
1199
if(ret == EAI_SYSTEM){
1200
perror_plus("getnameinfo");
1201
} else if(ret != 0) {
1202
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
1203
} else if(strcmp(addrstr, ip) != 0){
1204
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
1215
ret = connect(tcp_sd, (struct sockaddr *)&to,
1216
sizeof(struct sockaddr_in6));
1218
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
1219
sizeof(struct sockaddr_in));
1222
if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))
1223
and if_index != AVAHI_IF_UNSPEC
1224
and connect_to == NULL
1225
and not route_added and
1226
((af == AF_INET6 and not
1227
IN6_IS_ADDR_LINKLOCAL(&(((struct sockaddr_in6 *)
1229
or (af == AF_INET and
1230
/* Not a a IPv4LL address */
1231
(ntohl(((struct sockaddr_in *)&to)->sin_addr.s_addr)
1232
& 0xFFFF0000L) != 0xA9FE0000L))){
1233
/* Work around Avahi bug - Avahi does not announce link-local
1234
addresses if it has a global address, so local hosts with
1235
*only* a link-local address (e.g. Mandos clients) cannot
1236
connect to a Mandos server announced by Avahi on a server
1237
host with a global address. Work around this by retrying
1238
with an explicit route added with the server's address.
1240
Avahi bug reference:
1241
https://lists.freedesktop.org/archives/avahi/2010-February/001833.html
1242
https://bugs.debian.org/587961
1245
fprintf_plus(stderr, "Mandos server unreachable, trying"
1249
route_added = add_local_route(ip, if_index);
1255
if(errno != ECONNREFUSED or debug){
1257
perror_plus("connect");
473
1270
const char *out = mandos_protocol_version;
476
1273
size_t out_size = strlen(out);
477
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
478
out_size - written));
1274
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
1275
out_size - written));
1278
perror_plus("write");
482
1280
goto mandos_end;
484
1282
written += (size_t)ret;
485
1283
if(written < out_size){
488
if (out == mandos_protocol_version){
1286
if(out == mandos_protocol_version){
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){
1301
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
1309
/* This casting via intptr_t is to eliminate warning about casting
1310
an int to a pointer type. This is exactly how the GnuTLS Guile
1311
function "set-session-transport-fd!" does it. */
1312
gnutls_transport_set_ptr(session,
1313
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
1321
ret = gnutls_handshake(session);
1326
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1328
if(ret != GNUTLS_E_SUCCESS){
507
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
1330
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
511
1334
goto mandos_end;
514
1337
/* Read OpenPGP packet that contains the wanted password */
517
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
1340
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
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,
1351
buffer_capacity = incbuffer(&buffer, buffer_length,
1353
if(buffer_capacity == 0){
1355
perror_plus("incbuffer");
1365
sret = gnutls_record_recv(session, buffer+buffer_length,
536
1372
case GNUTLS_E_INTERRUPTED:
537
1373
case GNUTLS_E_AGAIN:
539
1375
case GNUTLS_E_REHANDSHAKE:
540
ret = gnutls_handshake (session);
542
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
1377
ret = gnutls_handshake(session);
1383
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1385
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
545
1389
goto mandos_end;
549
fprintf(stderr, "Unknown error while reading data from"
550
" encrypted session with Mandos server\n");
552
gnutls_bye (session, GNUTLS_SHUT_RDWR);
1393
fprintf_plus(stderr, "Unknown error while reading data from"
1394
" encrypted session with Mandos server\n");
1395
gnutls_bye(session, GNUTLS_SHUT_RDWR);
553
1397
goto mandos_end;
556
buffer_length += (size_t) ret;
1400
buffer_length += (size_t) sret;
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){
1405
fprintf_plus(stderr, "Closing TLS session\n");
1414
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
1419
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
1421
if(buffer_length > 0){
1422
ssize_t decrypted_buffer_size;
1423
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1424
&decrypted_buffer, mc);
1425
if(decrypted_buffer_size >= 0){
573
1429
while(written < (size_t) decrypted_buffer_size){
574
ret = (int)fwrite (decrypted_buffer + written, 1,
575
(size_t)decrypted_buffer_size - written,
1435
ret = (int)fwrite(decrypted_buffer + written, 1,
1436
(size_t)decrypted_buffer_size - written,
577
1438
if(ret == 0 and ferror(stdout)){
579
fprintf(stderr, "Error writing encrypted data: %s\n",
1441
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
585
1447
written += (size_t)ret;
587
free(decrypted_buffer);
1449
ret = fflush(stdout);
1453
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
593
1463
/* Shutdown procedure */
598
gnutls_deinit (session);
599
gnutls_certificate_free_credentials (mc->cred);
600
gnutls_global_deinit ();
1468
if(not delete_local_route(ip, if_index)){
1469
fprintf_plus(stderr, "Failed to delete local route to %s on"
1470
" interface %d", ip, if_index);
1474
free(decrypted_buffer);
1477
ret = close(tcp_sd);
1483
perror_plus("close");
1485
gnutls_deinit(session);
1495
__attribute__((nonnull))
604
1496
static void resolve_callback(AvahiSServiceResolver *r,
605
1497
AvahiIfIndex interface,
606
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1498
AvahiProtocol proto,
607
1499
AvahiResolverEvent event,
608
1500
const char *name,
609
1501
const char *type,
691
1610
case AVAHI_BROWSER_ALL_FOR_NOW:
692
1611
case AVAHI_BROWSER_CACHE_EXHAUSTED:
694
fprintf(stderr, "No Mandos server found, still searching...\n");
1613
fprintf_plus(stderr, "No Mandos server found, still"
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';
1620
/* Signal handler that stops main loop after SIGTERM */
1621
static void handle_sigterm(int sig){
1626
signal_received = sig;
1627
int old_errno = errno;
1628
/* set main loop to exit */
1629
if(simple_poll != NULL){
1630
avahi_simple_poll_quit(simple_poll);
1635
__attribute__((nonnull, warn_unused_result))
1636
bool get_flags(const char *ifname, struct ifreq *ifr){
1640
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1643
perror_plus("socket");
1647
strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);
1648
ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */
1649
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1653
perror_plus("ioctl SIOCGIFFLAGS");
1661
__attribute__((nonnull, warn_unused_result))
1662
bool good_flags(const char *ifname, const struct ifreq *ifr){
1664
/* Reject the loopback device */
1665
if(ifr->ifr_flags & IFF_LOOPBACK){
1667
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1672
/* Accept point-to-point devices only if connect_to is specified */
1673
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1675
fprintf_plus(stderr, "Accepting point-to-point interface"
1676
" \"%s\"\n", ifname);
1680
/* Otherwise, reject non-broadcast-capable devices */
1681
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1683
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1684
" \"%s\"\n", ifname);
1688
/* Reject non-ARP interfaces (including dummy interfaces) */
1689
if(ifr->ifr_flags & IFF_NOARP){
1691
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1697
/* Accept this device */
1699
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1705
* This function determines if a directory entry in /sys/class/net
1706
* corresponds to an acceptable network device.
1707
* (This function is passed to scandir(3) as a filter function.)
1709
__attribute__((nonnull, warn_unused_result))
1710
int good_interface(const struct dirent *if_entry){
1711
if(if_entry->d_name[0] == '.'){
1716
if(not get_flags(if_entry->d_name, &ifr)){
1718
fprintf_plus(stderr, "Failed to get flags for interface "
1719
"\"%s\"\n", if_entry->d_name);
1724
if(not good_flags(if_entry->d_name, &ifr)){
1731
* This function determines if a network interface is up.
1733
__attribute__((nonnull, warn_unused_result))
1734
bool interface_is_up(const char *interface){
1736
if(not get_flags(interface, &ifr)){
1738
fprintf_plus(stderr, "Failed to get flags for interface "
1739
"\"%s\"\n", interface);
1744
return (bool)(ifr.ifr_flags & IFF_UP);
1748
* This function determines if a network interface is running
1750
__attribute__((nonnull, warn_unused_result))
1751
bool interface_is_running(const char *interface){
1753
if(not get_flags(interface, &ifr)){
1755
fprintf_plus(stderr, "Failed to get flags for interface "
1756
"\"%s\"\n", interface);
1761
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1764
__attribute__((nonnull, pure, warn_unused_result))
1765
int notdotentries(const struct dirent *direntry){
1766
/* Skip "." and ".." */
1767
if(direntry->d_name[0] == '.'
1768
and (direntry->d_name[1] == '\0'
1769
or (direntry->d_name[1] == '.'
1770
and direntry->d_name[2] == '\0'))){
1776
/* Is this directory entry a runnable program? */
1777
__attribute__((nonnull, warn_unused_result))
1778
int runnable_hook(const struct dirent *direntry){
1783
if((direntry->d_name)[0] == '\0'){
1788
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1789
"abcdefghijklmnopqrstuvwxyz"
1792
if((direntry->d_name)[sret] != '\0'){
1793
/* Contains non-allowed characters */
1795
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1801
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1804
perror_plus("Could not stat hook");
1808
if(not (S_ISREG(st.st_mode))){
1809
/* Not a regular file */
1811
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1816
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1817
/* Not executable */
1819
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1825
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1831
__attribute__((nonnull, warn_unused_result))
1832
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1833
mandos_context *mc){
1835
struct timespec now;
1836
struct timespec waited_time;
1837
intmax_t block_time;
1840
if(mc->current_server == NULL){
1842
fprintf_plus(stderr, "Wait until first server is found."
1845
ret = avahi_simple_poll_iterate(s, -1);
1848
fprintf_plus(stderr, "Check current_server if we should run"
1851
/* the current time */
1852
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1854
perror_plus("clock_gettime");
1857
/* Calculating in ms how long time between now and server
1858
who we visted longest time ago. Now - last seen. */
1859
waited_time.tv_sec = (now.tv_sec
1860
- mc->current_server->last_seen.tv_sec);
1861
waited_time.tv_nsec = (now.tv_nsec
1862
- mc->current_server->last_seen.tv_nsec);
1863
/* total time is 10s/10,000ms.
1864
Converting to s from ms by dividing by 1,000,
1865
and ns to ms by dividing by 1,000,000. */
1866
block_time = ((retry_interval
1867
- ((intmax_t)waited_time.tv_sec * 1000))
1868
- ((intmax_t)waited_time.tv_nsec / 1000000));
1871
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1875
if(block_time <= 0){
1876
ret = start_mandos_communication(mc->current_server->ip,
1877
mc->current_server->port,
1878
mc->current_server->if_index,
1879
mc->current_server->af, mc);
1881
avahi_simple_poll_quit(s);
1884
ret = clock_gettime(CLOCK_MONOTONIC,
1885
&mc->current_server->last_seen);
1887
perror_plus("clock_gettime");
1890
mc->current_server = mc->current_server->next;
1891
block_time = 0; /* Call avahi to find new Mandos
1892
servers, but don't block */
1895
ret = avahi_simple_poll_iterate(s, (int)block_time);
1898
if(ret > 0 or errno != EINTR){
1899
return (ret != 1) ? ret : 0;
1905
__attribute__((nonnull))
1906
void run_network_hooks(const char *mode, const char *interface,
1908
struct dirent **direntries = NULL;
1909
if(hookdir_fd == -1){
1910
hookdir_fd = open(hookdir, O_RDONLY | O_DIRECTORY | O_PATH
1912
if(hookdir_fd == -1){
1913
if(errno == ENOENT){
1915
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1916
" found\n", hookdir);
1919
perror_plus("open");
1924
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1925
runnable_hook, alphasort);
1927
perror_plus("scandir");
1930
struct dirent *direntry;
1932
int devnull = (int)TEMP_FAILURE_RETRY(open("/dev/null", O_RDONLY));
1934
perror_plus("open(\"/dev/null\", O_RDONLY)");
1937
for(int i = 0; i < numhooks; i++){
1938
direntry = direntries[i];
1940
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1943
pid_t hook_pid = fork();
1946
/* Raise privileges */
1947
errno = raise_privileges_permanently();
1949
perror_plus("Failed to raise privileges");
1956
perror_plus("setgid");
1959
/* Reset supplementary groups */
1961
ret = setgroups(0, NULL);
1963
perror_plus("setgroups");
1966
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1968
perror_plus("setenv");
1971
ret = setenv("DEVICE", interface, 1);
1973
perror_plus("setenv");
1976
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1978
perror_plus("setenv");
1981
ret = setenv("MODE", mode, 1);
1983
perror_plus("setenv");
1987
ret = asprintf(&delaystring, "%f", (double)delay);
1989
perror_plus("asprintf");
1992
ret = setenv("DELAY", delaystring, 1);
1995
perror_plus("setenv");
1999
if(connect_to != NULL){
2000
ret = setenv("CONNECT", connect_to, 1);
2002
perror_plus("setenv");
2006
int hook_fd = (int)TEMP_FAILURE_RETRY(openat(hookdir_fd,
2010
perror_plus("openat");
2011
_exit(EXIT_FAILURE);
2013
if(close(hookdir_fd) == -1){
2014
perror_plus("close");
2015
_exit(EXIT_FAILURE);
2017
ret = dup2(devnull, STDIN_FILENO);
2019
perror_plus("dup2(devnull, STDIN_FILENO)");
2022
ret = close(devnull);
2024
perror_plus("close");
2027
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
2029
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
2032
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
2034
perror_plus("fexecve");
2035
_exit(EXIT_FAILURE);
2039
perror_plus("fork");
2044
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
2045
perror_plus("waitpid");
2049
if(WIFEXITED(status)){
2050
if(WEXITSTATUS(status) != 0){
2051
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
2052
" with status %d\n", direntry->d_name,
2053
WEXITSTATUS(status));
2057
} else if(WIFSIGNALED(status)){
2058
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
2059
" signal %d\n", direntry->d_name,
2064
fprintf_plus(stderr, "Warning: network hook \"%s\""
2065
" crashed\n", direntry->d_name);
2071
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
2077
if(close(hookdir_fd) == -1){
2078
perror_plus("close");
2085
__attribute__((nonnull, warn_unused_result))
2086
int bring_up_interface(const char *const interface,
2088
int old_errno = errno;
2090
struct ifreq network;
2091
unsigned int if_index = if_nametoindex(interface);
2093
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2103
if(not interface_is_up(interface)){
2105
int ioctl_errno = 0;
2106
if(not get_flags(interface, &network)){
2108
fprintf_plus(stderr, "Failed to get flags for interface "
2109
"\"%s\"\n", interface);
2113
network.ifr_flags |= IFF_UP; /* set flag */
2115
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2118
perror_plus("socket");
2126
perror_plus("close");
2133
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
2137
/* Raise privileges */
2138
ret_errno = raise_privileges();
2141
perror_plus("Failed to raise privileges");
2146
bool restore_loglevel = false;
2148
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
2149
messages about the network interface to mess up the prompt */
2150
ret_linux = klogctl(8, NULL, 5);
2151
if(ret_linux == -1){
2152
perror_plus("klogctl");
2154
restore_loglevel = true;
2157
#endif /* __linux__ */
2158
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2159
ioctl_errno = errno;
2161
if(restore_loglevel){
2162
ret_linux = klogctl(7, NULL, 0);
2163
if(ret_linux == -1){
2164
perror_plus("klogctl");
2167
#endif /* __linux__ */
2169
/* If raise_privileges() succeeded above */
2171
/* Lower privileges */
2172
ret_errno = lower_privileges();
2175
perror_plus("Failed to lower privileges");
2179
/* Close the socket */
2182
perror_plus("close");
2185
if(ret_setflags == -1){
2186
errno = ioctl_errno;
2187
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
2192
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
2196
/* Sleep checking until interface is running.
2197
Check every 0.25s, up to total time of delay */
2198
for(int i=0; i < delay * 4; i++){
2199
if(interface_is_running(interface)){
2202
struct timespec sleeptime = { .tv_nsec = 250000000 };
2203
ret = nanosleep(&sleeptime, NULL);
2204
if(ret == -1 and errno != EINTR){
2205
perror_plus("nanosleep");
2213
__attribute__((nonnull, warn_unused_result))
2214
int take_down_interface(const char *const interface){
2215
int old_errno = errno;
2216
struct ifreq network;
2217
unsigned int if_index = if_nametoindex(interface);
2219
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
2223
if(interface_is_up(interface)){
2225
int ioctl_errno = 0;
2226
if(not get_flags(interface, &network) and debug){
2228
fprintf_plus(stderr, "Failed to get flags for interface "
2229
"\"%s\"\n", interface);
2233
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2235
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
2238
perror_plus("socket");
2244
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
2248
/* Raise privileges */
2249
ret_errno = raise_privileges();
2252
perror_plus("Failed to raise privileges");
2255
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
2256
ioctl_errno = errno;
2258
/* If raise_privileges() succeeded above */
2260
/* Lower privileges */
2261
ret_errno = lower_privileges();
2264
perror_plus("Failed to lower privileges");
2268
/* Close the socket */
2269
int ret = close(sd);
2271
perror_plus("close");
2274
if(ret_setflags == -1){
2275
errno = ioctl_errno;
2276
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2281
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
721
2289
int main(int argc, char *argv[]){
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");
2290
mandos_context mc = { .server = NULL, .dh_bits = 0,
2291
.priority = "SECURE256:!CTYPE-X.509"
2292
":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",
2293
.current_server = NULL, .interfaces = NULL,
2294
.interfaces_size = 0 };
2295
AvahiSServiceBrowser *sb = NULL;
2300
int exitcode = EXIT_SUCCESS;
2301
char *interfaces_to_take_down = NULL;
2302
size_t interfaces_to_take_down_size = 0;
2303
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
2304
char old_tempdir[] = "/tmp/mandosXXXXXX";
2305
char *tempdir = NULL;
2306
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
2307
const char *seckey = PATHDIR "/" SECKEY;
2308
const char *pubkey = PATHDIR "/" PUBKEY;
2309
const char *dh_params_file = NULL;
2310
char *interfaces_hooks = NULL;
2312
bool gnutls_initialized = false;
2313
bool gpgme_initialized = false;
2315
double retry_interval = 10; /* 10s between trying a server and
2316
retrying the same server again */
2318
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
2319
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
2324
/* Lower any group privileges we might have, just to be safe */
2328
perror_plus("setgid");
2331
/* Lower user privileges (temporarily) */
2335
perror_plus("seteuid");
2343
struct argp_option options[] = {
2344
{ .name = "debug", .key = 128,
2345
.doc = "Debug mode", .group = 3 },
2346
{ .name = "connect", .key = 'c',
2347
.arg = "ADDRESS:PORT",
2348
.doc = "Connect directly to a specific Mandos server",
2350
{ .name = "interface", .key = 'i',
2352
.doc = "Network interface that will be used to search for"
2355
{ .name = "seckey", .key = 's',
2357
.doc = "OpenPGP secret key file base name",
2359
{ .name = "pubkey", .key = 'p',
2361
.doc = "OpenPGP public key file base name",
2363
{ .name = "dh-bits", .key = 129,
2365
.doc = "Bit length of the prime number used in the"
2366
" Diffie-Hellman key exchange",
2368
{ .name = "dh-params", .key = 134,
2370
.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"
2371
" for the Diffie-Hellman key exchange",
2373
{ .name = "priority", .key = 130,
2375
.doc = "GnuTLS priority string for the TLS handshake",
2377
{ .name = "delay", .key = 131,
2379
.doc = "Maximum delay to wait for interface startup",
2381
{ .name = "retry", .key = 132,
2383
.doc = "Retry interval used when denied by the Mandos server",
2385
{ .name = "network-hook-dir", .key = 133,
2387
.doc = "Directory where network hooks are located",
2390
* These reproduce what we would get without ARGP_NO_HELP
2392
{ .name = "help", .key = '?',
2393
.doc = "Give this help list", .group = -1 },
2394
{ .name = "usage", .key = -3,
2395
.doc = "Give a short usage message", .group = -1 },
2396
{ .name = "version", .key = 'V',
2397
.doc = "Print program version", .group = -1 },
2401
error_t parse_opt(int key, char *arg,
2402
struct argp_state *state){
2405
case 128: /* --debug */
2408
case 'c': /* --connect */
2411
case 'i': /* --interface */
2412
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2415
argp_error(state, "%s", strerror(ret_errno));
2418
case 's': /* --seckey */
2421
case 'p': /* --pubkey */
2424
case 129: /* --dh-bits */
2426
tmpmax = strtoimax(arg, &tmp, 10);
2427
if(errno != 0 or tmp == arg or *tmp != '\0'
2428
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2429
argp_error(state, "Bad number of DH bits");
2431
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2433
case 134: /* --dh-params */
2434
dh_params_file = arg;
2436
case 130: /* --priority */
2439
case 131: /* --delay */
2441
delay = strtof(arg, &tmp);
2442
if(errno != 0 or tmp == arg or *tmp != '\0'){
2443
argp_error(state, "Bad delay");
2445
case 132: /* --retry */
2447
retry_interval = strtod(arg, &tmp);
2448
if(errno != 0 or tmp == arg or *tmp != '\0'
2449
or (retry_interval * 1000) > INT_MAX
2450
or retry_interval < 0){
2451
argp_error(state, "Bad retry interval");
2454
case 133: /* --network-hook-dir */
2458
* These reproduce what we would get without ARGP_NO_HELP
2460
case '?': /* --help */
2461
argp_state_help(state, state->out_stream,
2462
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2463
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2464
case -3: /* --usage */
2465
argp_state_help(state, state->out_stream,
2466
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2467
case 'V': /* --version */
2468
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2469
exit(argp_err_exit_status);
2472
return ARGP_ERR_UNKNOWN;
2477
struct argp argp = { .options = options, .parser = parse_opt,
2479
.doc = "Mandos client -- Get and decrypt"
2480
" passwords from a Mandos server" };
2481
ret_errno = argp_parse(&argp, argc, argv,
2482
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2489
perror_plus("argp_parse");
2490
exitcode = EX_OSERR;
2493
exitcode = EX_USAGE;
2499
/* Work around Debian bug #633582:
2500
<https://bugs.debian.org/633582> */
2502
/* Re-raise privileges */
2503
ret = raise_privileges();
2506
perror_plus("Failed to raise privileges");
2510
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2511
int seckey_fd = open(seckey, O_RDONLY);
2512
if(seckey_fd == -1){
2513
perror_plus("open");
2515
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2517
perror_plus("fstat");
2519
if(S_ISREG(st.st_mode)
2520
and st.st_uid == 0 and st.st_gid == 0){
2521
ret = fchown(seckey_fd, uid, gid);
2523
perror_plus("fchown");
2531
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2532
int pubkey_fd = open(pubkey, O_RDONLY);
2533
if(pubkey_fd == -1){
2534
perror_plus("open");
2536
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2538
perror_plus("fstat");
2540
if(S_ISREG(st.st_mode)
2541
and st.st_uid == 0 and st.st_gid == 0){
2542
ret = fchown(pubkey_fd, uid, gid);
2544
perror_plus("fchown");
2552
if(dh_params_file != NULL
2553
and strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){
2554
int dhparams_fd = open(dh_params_file, O_RDONLY);
2555
if(dhparams_fd == -1){
2556
perror_plus("open");
2558
ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));
2560
perror_plus("fstat");
2562
if(S_ISREG(st.st_mode)
2563
and st.st_uid == 0 and st.st_gid == 0){
2564
ret = fchown(dhparams_fd, uid, gid);
2566
perror_plus("fchown");
2574
/* Lower privileges */
2575
ret = lower_privileges();
2578
perror_plus("Failed to lower privileges");
2583
/* Remove invalid interface names (except "none") */
2585
char *interface = NULL;
2586
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2588
if(strcmp(interface, "none") != 0
2589
and if_nametoindex(interface) == 0){
2590
if(interface[0] != '\0'){
2591
fprintf_plus(stderr, "Not using nonexisting interface"
2592
" \"%s\"\n", interface);
2594
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2600
/* Run network hooks */
2602
if(mc.interfaces != NULL){
2603
interfaces_hooks = malloc(mc.interfaces_size);
2604
if(interfaces_hooks == NULL){
2605
perror_plus("malloc");
2608
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2609
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2611
run_network_hooks("start", interfaces_hooks != NULL ?
2612
interfaces_hooks : "", delay);
2616
avahi_set_log_function(empty_log);
2619
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2620
from the signal handler */
2621
/* Initialize the pseudo-RNG for Avahi */
2622
srand((unsigned int) time(NULL));
2623
simple_poll = avahi_simple_poll_new();
2624
if(simple_poll == NULL){
2625
fprintf_plus(stderr,
2626
"Avahi: Failed to create simple poll object.\n");
2627
exitcode = EX_UNAVAILABLE;
2631
sigemptyset(&sigterm_action.sa_mask);
2632
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2634
perror_plus("sigaddset");
2635
exitcode = EX_OSERR;
2638
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2640
perror_plus("sigaddset");
2641
exitcode = EX_OSERR;
2644
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2646
perror_plus("sigaddset");
2647
exitcode = EX_OSERR;
2650
/* Need to check if the handler is SIG_IGN before handling:
2651
| [[info:libc:Initial Signal Actions]] |
2652
| [[info:libc:Basic Signal Handling]] |
2654
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2656
perror_plus("sigaction");
2659
if(old_sigterm_action.sa_handler != SIG_IGN){
2660
ret = sigaction(SIGINT, &sigterm_action, NULL);
2662
perror_plus("sigaction");
2663
exitcode = EX_OSERR;
2667
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2669
perror_plus("sigaction");
2672
if(old_sigterm_action.sa_handler != SIG_IGN){
2673
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2675
perror_plus("sigaction");
2676
exitcode = EX_OSERR;
2680
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2682
perror_plus("sigaction");
2685
if(old_sigterm_action.sa_handler != SIG_IGN){
2686
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2688
perror_plus("sigaction");
2689
exitcode = EX_OSERR;
2694
/* If no interfaces were specified, make a list */
2695
if(mc.interfaces == NULL){
2696
struct dirent **direntries = NULL;
2697
/* Look for any good interfaces */
2698
ret = scandir(sys_class_net, &direntries, good_interface,
2701
/* Add all found interfaces to interfaces list */
2702
for(int i = 0; i < ret; ++i){
2703
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2704
direntries[i]->d_name);
2707
perror_plus("argz_add");
2708
free(direntries[i]);
2712
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2713
direntries[i]->d_name);
2715
free(direntries[i]);
2722
fprintf_plus(stderr, "Could not find a network interface\n");
820
2723
exitcode = EXIT_FAILURE;
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);
2728
/* Bring up interfaces which are down, and remove any "none"s */
2730
char *interface = NULL;
2731
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2733
/* If interface name is "none", stop bringing up interfaces.
2734
Also remove all instances of "none" from the list */
2735
if(strcmp(interface, "none") == 0){
2736
argz_delete(&mc.interfaces, &mc.interfaces_size,
2739
while((interface = argz_next(mc.interfaces,
2740
mc.interfaces_size, interface))){
2741
if(strcmp(interface, "none") == 0){
2742
argz_delete(&mc.interfaces, &mc.interfaces_size,
2749
bool interface_was_up = interface_is_up(interface);
2750
errno = bring_up_interface(interface, delay);
2751
if(not interface_was_up){
2753
fprintf_plus(stderr, "Failed to bring up interface \"%s\":"
2754
" %s\n", interface, strerror(errno));
2756
errno = argz_add(&interfaces_to_take_down,
2757
&interfaces_to_take_down_size,
2760
perror_plus("argz_add");
2765
if(debug and (interfaces_to_take_down == NULL)){
2766
fprintf_plus(stderr, "No interfaces were brought up\n");
2770
/* If we only got one interface, explicitly use only that one */
2771
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2773
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2776
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2783
ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);
2785
fprintf_plus(stderr, "init_gnutls_global failed\n");
2786
exitcode = EX_UNAVAILABLE;
2789
gnutls_initialized = true;
2796
/* Try /run/tmp before /tmp */
2797
tempdir = mkdtemp(run_tempdir);
2798
if(tempdir == NULL and errno == ENOENT){
2800
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2801
run_tempdir, old_tempdir);
2803
tempdir = mkdtemp(old_tempdir);
2805
if(tempdir == NULL){
2806
perror_plus("mkdtemp");
2814
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2815
fprintf_plus(stderr, "init_gpgme failed\n");
2816
exitcode = EX_UNAVAILABLE;
2819
gpgme_initialized = true;
2826
if(connect_to != NULL){
2827
/* Connect directly, do not use Zeroconf */
2828
/* (Mainly meant for debugging) */
2829
char *address = strrchr(connect_to, ':');
2831
if(address == NULL){
2832
fprintf_plus(stderr, "No colon in address\n");
2833
exitcode = EX_USAGE;
2843
tmpmax = strtoimax(address+1, &tmp, 10);
2844
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2845
or tmpmax != (in_port_t)tmpmax){
2846
fprintf_plus(stderr, "Bad port number\n");
2847
exitcode = EX_USAGE;
2855
port = (in_port_t)tmpmax;
2857
/* Colon in address indicates IPv6 */
2859
if(strchr(connect_to, ':') != NULL){
2861
/* Accept [] around IPv6 address - see RFC 5952 */
2862
if(connect_to[0] == '[' and address[-1] == ']')
2870
address = connect_to;
2876
while(not quit_now){
2877
ret = start_mandos_communication(address, port, if_index, af,
2879
if(quit_now or ret == 0){
2883
fprintf_plus(stderr, "Retrying in %d seconds\n",
2884
(int)retry_interval);
2886
sleep((unsigned int)retry_interval);
2890
exitcode = EXIT_SUCCESS;
2901
AvahiServerConfig config;
2902
/* Do not publish any local Zeroconf records */
2903
avahi_server_config_init(&config);
2904
config.publish_hinfo = 0;
2905
config.publish_addresses = 0;
2906
config.publish_workstation = 0;
2907
config.publish_domain = 0;
2909
/* Allocate a new server */
2910
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2911
&config, NULL, NULL, &ret);
2913
/* Free the Avahi configuration data */
2914
avahi_server_config_free(&config);
2917
/* Check if creating the Avahi server object succeeded */
2918
if(mc.server == NULL){
2919
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2920
avahi_strerror(ret));
2921
exitcode = EX_UNAVAILABLE;
2929
/* Create the Avahi service browser */
2930
sb = avahi_s_service_browser_new(mc.server, if_index,
2931
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2932
NULL, 0, browse_callback,
2935
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2936
avahi_strerror(avahi_server_errno(mc.server)));
2937
exitcode = EX_UNAVAILABLE;
2945
/* Run the main loop */
2948
fprintf_plus(stderr, "Starting Avahi loop search\n");
2951
ret = avahi_loop_with_timeout(simple_poll,
2952
(int)(retry_interval * 1000), &mc);
2954
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2955
(ret == 0) ? "successfully" : "with error");
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);
2961
if(signal_received){
2962
fprintf_plus(stderr, "%s exiting due to signal %d: %s\n",
2963
argv[0], signal_received,
2964
strsignal(signal_received));
2966
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2970
/* Cleanup things */
2971
free(mc.interfaces);
2974
avahi_s_service_browser_free(sb);
2976
if(mc.server != NULL)
2977
avahi_server_free(mc.server);
2979
if(simple_poll != NULL)
2980
avahi_simple_poll_free(simple_poll);
2982
if(gnutls_initialized){
2983
gnutls_certificate_free_credentials(mc.cred);
2984
gnutls_dh_params_deinit(mc.dh_params);
2987
if(gpgme_initialized){
2988
gpgme_release(mc.ctx);
2991
/* Cleans up the circular linked list of Mandos servers the client
2993
if(mc.current_server != NULL){
2994
mc.current_server->prev->next = NULL;
2995
while(mc.current_server != NULL){
2996
server *next = mc.current_server->next;
2998
#pragma GCC diagnostic push
2999
#pragma GCC diagnostic ignored "-Wcast-qual"
3001
free((char *)(mc.current_server->ip));
3003
#pragma GCC diagnostic pop
3005
free(mc.current_server);
3006
mc.current_server = next;
3010
/* Re-raise privileges */
3012
ret = raise_privileges();
3015
perror_plus("Failed to raise privileges");
3018
/* Run network hooks */
3019
run_network_hooks("stop", interfaces_hooks != NULL ?
3020
interfaces_hooks : "", delay);
3022
/* Take down the network interfaces which were brought up */
3024
char *interface = NULL;
3025
while((interface=argz_next(interfaces_to_take_down,
3026
interfaces_to_take_down_size,
3028
ret = take_down_interface(interface);
3031
perror_plus("Failed to take down interface");
3034
if(debug and (interfaces_to_take_down == NULL)){
3035
fprintf_plus(stderr, "No interfaces needed to be taken"
3041
ret = lower_privileges_permanently();
3044
perror_plus("Failed to lower privileges permanently");
3048
free(interfaces_to_take_down);
3049
free(interfaces_hooks);
3051
void clean_dir_at(int base, const char * const dirname,
3053
struct dirent **direntries = NULL;
3055
int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,
3061
perror_plus("open");
3063
int numentries = scandirat(dir_fd, ".", &direntries,
3064
notdotentries, alphasort);
3065
if(numentries >= 0){
3066
for(int i = 0; i < numentries; i++){
3068
fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",
3069
dirname, direntries[i]->d_name);
3071
dret = unlinkat(dir_fd, direntries[i]->d_name, 0);
3073
if(errno == EISDIR){
3074
dret = unlinkat(dir_fd, direntries[i]->d_name,
3077
if((dret == -1) and (errno == ENOTEMPTY)
3078
and (strcmp(direntries[i]->d_name, "private-keys-v1.d")
3079
== 0) and (level == 0)){
3080
/* Recurse only in this special case */
3081
clean_dir_at(dir_fd, direntries[i]->d_name, level+1);
3085
fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,
3086
direntries[i]->d_name, strerror(errno));
3089
free(direntries[i]);
3092
/* need to clean even if 0 because man page doesn't specify */
3094
if(numentries == -1){
3095
perror_plus("scandirat");
3097
dret = unlinkat(base, dirname, AT_REMOVEDIR);
3098
if(dret == -1 and errno != ENOENT){
3099
perror_plus("rmdir");
3102
perror_plus("scandirat");
3107
/* Removes the GPGME temp directory and all files inside */
3108
if(tempdir != NULL){
3109
clean_dir_at(-1, tempdir, 0);
3113
sigemptyset(&old_sigterm_action.sa_mask);
3114
old_sigterm_action.sa_handler = SIG_DFL;
3115
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
3116
&old_sigterm_action,
3119
perror_plus("sigaction");
3122
ret = raise(signal_received);
3123
} while(ret != 0 and errno == EINTR);
3125
perror_plus("raise");
3128
TEMP_FAILURE_RETRY(pause());