104
33
#include <avahi-common/malloc.h>
105
34
#include <avahi-common/error.h>
108
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
111
init_gnutls_session(),
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
118
#include <gpgme.h> /* All GPGME types, constants and
121
GPGME_PROTOCOL_OpenPGP,
37
#include <sys/types.h> /* socket(), setsockopt(), inet_pton() */
38
#include <sys/socket.h> /* socket(), setsockopt(), struct sockaddr_in6, struct in6_addr, inet_pton() */
39
#include <gnutls/gnutls.h> /* ALL GNUTLS STUFF */
40
#include <gnutls/openpgp.h> /* gnutls with openpgp stuff */
42
#include <unistd.h> /* close() */
43
#include <netinet/in.h>
44
#include <stdbool.h> /* true */
45
#include <string.h> /* memset */
46
#include <arpa/inet.h> /* inet_pton() */
47
#include <iso646.h> /* not */
50
#include <errno.h> /* perror() */
55
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
57
#define CERTFILE CERT_ROOT "openpgp-client.txt"
58
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
124
59
#define BUFFER_SIZE 256
126
#define PATHDIR "/conf/conf.d/mandos"
127
#define SECKEY "seckey.txt"
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
131
62
bool debug = false;
132
static const char mandos_protocol_version[] = "1";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
143
AvahiIfIndex if_index;
145
struct timespec last_seen;
150
/* Used for passing in values through the Avahi callback functions */
152
AvahiSimplePoll *simple_poll;
65
gnutls_session_t session;
154
66
gnutls_certificate_credentials_t cred;
155
unsigned int dh_bits;
156
67
gnutls_dh_params_t dh_params;
157
const char *priority;
71
ssize_t gpg_packet_decrypt (char *packet, size_t packet_size, char **new_packet, char *homedir){
72
gpgme_data_t dh_crypto, dh_plain;
159
server *current_server;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
178
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_start (ap, format);
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
190
* "buffer_length" is how much is already used.
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
buffer_capacity += BUFFER_SIZE;
201
return buffer_capacity;
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
213
*new_server = (server){ .ip = strdup(ip),
215
.if_index = if_index,
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
perror_plus("clock_gettime");
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
76
size_t new_packet_capacity = 0;
77
size_t new_packet_length = 0;
247
78
gpgme_engine_info_t engine_info;
251
* Helper function to insert pub and seckey to the engine keyring.
253
bool import_key(const char *filename){
256
gpgme_data_t pgp_data;
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
271
rc = gpgme_op_import(mc.ctx, pgp_data);
272
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
282
gpgme_data_release(pgp_data);
287
fprintf_plus(stderr, "Initializing GPGME\n");
81
fprintf(stderr, "Attempting to decrypt password from gpg packet\n");
291
85
gpgme_check_version(NULL);
292
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
86
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
299
/* Set GPGME home directory for the OpenPGP engine only */
300
rc = gpgme_get_engine_info(&engine_info);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
88
/* Set GPGME home directory */
89
rc = gpgme_get_engine_info (&engine_info);
90
if (rc != GPG_ERR_NO_ERROR){
91
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
92
gpgme_strsource(rc), gpgme_strerror(rc));
306
95
while(engine_info != NULL){
307
96
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
308
97
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
309
engine_info->file_name, tempdir);
98
engine_info->file_name, homedir);
312
101
engine_info = engine_info->next;
314
103
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
320
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
322
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
329
if(not import_key(pubkey) or not import_key(seckey)){
337
* Decrypt OpenPGP data.
338
* Returns -1 on error
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
343
gpgme_data_t dh_crypto, dh_plain;
346
size_t plaintext_capacity = 0;
347
ssize_t plaintext_length = 0;
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
353
/* Create new GPGME data buffer from memory cryptotext */
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
356
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
104
fprintf(stderr, "Could not set home dir to %s\n", homedir);
108
/* Create new GPGME data buffer from packet buffer */
109
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
110
if (rc != GPG_ERR_NO_ERROR){
111
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
112
gpgme_strsource(rc), gpgme_strerror(rc));
362
116
/* Create new empty GPGME data buffer for the plaintext */
363
117
rc = gpgme_data_new(&dh_plain);
364
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
368
gpgme_data_release(dh_crypto);
372
/* Decrypt data from the cryptotext data buffer to the plaintext
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
378
plaintext_length = -1;
380
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
389
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
392
gpgme_recipient_t recipient;
393
recipient = result->recipients;
118
if (rc != GPG_ERR_NO_ERROR){
119
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
120
gpgme_strsource(rc), gpgme_strerror(rc));
124
/* Create new GPGME "context" */
125
rc = gpgme_new(&ctx);
126
if (rc != GPG_ERR_NO_ERROR){
127
fprintf(stderr, "bad gpgme_new: %s: %s\n",
128
gpgme_strsource(rc), gpgme_strerror(rc));
132
/* Decrypt data from the FILE pointer to the plaintext data buffer */
133
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
134
if (rc != GPG_ERR_NO_ERROR){
135
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
136
gpgme_strsource(rc), gpgme_strerror(rc));
141
fprintf(stderr, "decryption of gpg packet succeeded\n");
145
gpgme_decrypt_result_t result;
146
result = gpgme_op_decrypt_result(ctx);
148
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
150
fprintf(stderr, "Unsupported algorithm: %s\n", result->unsupported_algorithm);
151
fprintf(stderr, "Wrong key usage: %d\n", result->wrong_key_usage);
152
if(result->file_name != NULL){
153
fprintf(stderr, "File name: %s\n", result->file_name);
155
gpgme_recipient_t recipient;
156
recipient = result->recipients;
394
158
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
159
fprintf(stderr, "Public key algorithm: %s\n",
160
gpgme_pubkey_algo_name(recipient->pubkey_algo));
161
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
162
fprintf(stderr, "Secret key available: %s\n",
163
recipient->status == GPG_ERR_NO_SECKEY ? "No" : "Yes");
402
164
recipient = recipient->next;
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
170
/* Delete the GPGME FILE pointer cryptotext data buffer */
171
gpgme_data_release(dh_crypto);
413
173
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
416
plaintext_length = -1;
174
gpgme_data_seek(dh_plain, 0, SEEK_SET);
422
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
425
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
plaintext_length = -1;
178
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
179
*new_packet = realloc(*new_packet, new_packet_capacity + BUFFER_SIZE);
180
if (*new_packet == NULL){
184
new_packet_capacity += BUFFER_SIZE;
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
187
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length, BUFFER_SIZE);
433
188
/* Print the data, if any */
190
/* If password is empty, then a incorrect error will be printed */
439
perror_plus("gpgme_data_read");
440
plaintext_length = -1;
194
perror("gpgme_data_read");
443
plaintext_length += ret;
197
new_packet_length += ret;
447
fprintf_plus(stderr, "Decrypted password is: ");
448
for(ssize_t i = 0; i < plaintext_length; i++){
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
451
fprintf(stderr, "\n");
201
fprintf(stderr, "decrypted password is: %s\n", *new_packet);
456
/* Delete the GPGME cryptotext data buffer */
457
gpgme_data_release(dh_crypto);
459
/* Delete the GPGME plaintext data buffer */
204
/* Delete the GPGME plaintext data buffer */
460
205
gpgme_data_release(dh_plain);
461
return plaintext_length;
206
return new_packet_length;
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
209
static const char * safer_gnutls_strerror (int value) {
210
const char *ret = gnutls_strerror (value);
468
212
ret = "(unknown)";
472
/* GnuTLS log function callback */
473
static void debuggnutls(__attribute__((unused)) int level,
475
fprintf_plus(stderr, "GnuTLS: %s", string);
216
void debuggnutls(int level, const char* string){
217
fprintf(stderr, "%s", string);
478
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
220
int initgnutls(encrypted_session *es){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
225
fprintf(stderr, "Initializing gnutls\n");
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
safer_gnutls_strerror(ret));
229
if ((ret = gnutls_global_init ())
230
!= GNUTLS_E_SUCCESS) {
231
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
494
/* "Use a log level over 10 to enable all debugging options."
497
236
gnutls_global_set_log_level(11);
498
237
gnutls_global_set_log_function(debuggnutls);
501
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
503
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
506
gnutls_global_deinit();
241
/* openpgp credentials */
242
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
243
!= GNUTLS_E_SUCCESS) {
244
fprintf (stderr, "memory error: %s\n", safer_gnutls_strerror(ret));
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
249
fprintf(stderr, "Attempting to use openpgp certificate %s"
250
" and keyfile %s as gnutls credentials\n", CERTFILE, KEYFILE);
517
253
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
519
GNUTLS_OPENPGP_FMT_BASE64);
520
if(ret != GNUTLS_E_SUCCESS){
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
529
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
531
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
556
static int init_gnutls_session(gnutls_session_t *session){
558
/* GnuTLS session creation */
560
ret = gnutls_init(session, GNUTLS_SERVER);
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
565
if(ret != GNUTLS_E_SUCCESS){
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
576
gnutls_deinit(*session);
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
584
gnutls_deinit(*session);
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
593
gnutls_deinit(*session);
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
600
gnutls_deinit(*session);
254
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
255
if (ret != GNUTLS_E_SUCCESS) {
257
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s', '%s')\n",
258
ret, CERTFILE, KEYFILE);
259
fprintf(stdout, "The Error is: %s\n",
260
safer_gnutls_strerror(ret));
264
//Gnutls server initialization
265
if ((ret = gnutls_dh_params_init (&es->dh_params))
266
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "Error in dh parameter initialization: %s\n",
268
safer_gnutls_strerror(ret));
272
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
273
!= GNUTLS_E_SUCCESS) {
274
fprintf (stderr, "Error in prime generation: %s\n",
275
safer_gnutls_strerror(ret));
279
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
281
// Gnutls session creation
282
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
283
!= GNUTLS_E_SUCCESS){
284
fprintf(stderr, "Error in gnutls session initialization: %s\n",
285
safer_gnutls_strerror(ret));
288
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
289
!= GNUTLS_E_SUCCESS) {
290
fprintf(stderr, "Syntax error at: %s\n", err);
291
fprintf(stderr, "Gnutls error: %s\n",
292
safer_gnutls_strerror(ret));
296
if ((ret = gnutls_credentials_set
297
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf(stderr, "Error setting a credentials set: %s\n",
300
safer_gnutls_strerror(ret));
604
304
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
305
gnutls_certificate_server_set_request (es->session, GNUTLS_CERT_IGNORE);
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
307
gnutls_dh_set_prime_bits (es->session, DH_BITS);
612
/* Avahi log function callback */
613
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
614
__attribute__((unused)) const char *txt){}
312
void empty_log(AvahiLogLevel level, const char *txt){}
616
/* Called when a Mandos server is found */
617
static int start_mandos_communication(const char *ip, uint16_t port,
618
AvahiIfIndex if_index,
620
int ret, tcp_sd = -1;
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
314
int start_mandos_communication(char *ip, uint16_t port){
316
struct sockaddr_in6 to;
317
encrypted_session es;
626
318
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
319
char *decrypted_buffer;
628
320
size_t buffer_length = 0;
629
321
size_t buffer_capacity = 0;
632
gnutls_session_t session;
633
int pf; /* Protocol family */
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
655
ret = init_gnutls_session(&session);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
668
perror_plus("socket");
678
memset(&to, 0, sizeof(to));
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
688
perror_plus("inet_pton");
322
ssize_t decrypted_buffer_size;
324
const char interface[] = "eth0";
327
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
330
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
337
fprintf(stderr, "Binding to interface %s\n", interface);
340
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
342
perror("setsockopt bindtodevice");
346
memset(&to,0,sizeof(to));
347
to.sin6_family = AF_INET6;
348
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wunreachable-code */
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
712
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
716
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wunreachable-code */
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
char interface[IF_NAMESIZE];
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
perror_plus("inet_ntop");
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
perror_plus("connect");
782
const char *out = mandos_protocol_version;
785
size_t out_size = strlen(out);
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
790
perror_plus("write");
794
written += (size_t)ret;
795
if(written < out_size){
798
if(out == mandos_protocol_version){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
830
ret = gnutls_handshake(session);
835
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
837
if(ret != GNUTLS_E_SUCCESS){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
846
/* Read OpenPGP packet that contains the wanted password */
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
860
buffer_capacity = incbuffer(&buffer, buffer_length,
862
if(buffer_capacity == 0){
864
perror_plus("incbuffer");
874
sret = gnutls_record_recv(session, buffer+buffer_length,
354
fprintf(stderr, "Bad address: %s\n", ip);
357
to.sin6_port = htons(port);
358
to.sin6_scope_id = if_nametoindex(interface);
361
fprintf(stderr, "Connection to: %s\n", ip);
364
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
370
ret = initgnutls (&es);
377
gnutls_transport_set_ptr (es.session, (gnutls_transport_ptr_t) tcp_sd);
380
fprintf(stderr, "Establishing tls session with %s\n", ip);
384
ret = gnutls_handshake (es.session);
386
if (ret != GNUTLS_E_SUCCESS){
387
fprintf(stderr, "\n*** Handshake failed ***\n");
393
//Retrieve gpg packet that contains the wanted password
396
fprintf(stderr, "Retrieving pgp encrypted password from %s\n", ip);
400
if (buffer_length + BUFFER_SIZE > buffer_capacity){
401
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
406
buffer_capacity += BUFFER_SIZE;
409
ret = gnutls_record_recv
410
(es.session, buffer+buffer_length, BUFFER_SIZE);
881
416
case GNUTLS_E_INTERRUPTED:
882
417
case GNUTLS_E_AGAIN:
884
419
case GNUTLS_E_REHANDSHAKE:
886
ret = gnutls_handshake(session);
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
420
ret = gnutls_handshake (es.session);
422
fprintf(stderr, "\n*** Handshake failed ***\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
909
buffer_length += (size_t) sret;
914
fprintf_plus(stderr, "Closing TLS session\n");
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
930
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
934
if(decrypted_buffer_size >= 0){
937
while(written < (size_t) decrypted_buffer_size){
943
ret = (int)fwrite(decrypted_buffer + written, 1,
944
(size_t)decrypted_buffer_size - written,
946
if(ret == 0 and ferror(stdout)){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
955
written += (size_t)ret;
961
/* Shutdown procedure */
966
free(decrypted_buffer);
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
975
perror_plus("close");
977
gnutls_deinit(session);
429
fprintf(stderr, "Unknown error while reading data from encrypted session with mandos server\n");
431
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
435
buffer_length += ret;
439
if (buffer_length > 0){
440
if ((decrypted_buffer_size = gpg_packet_decrypt(buffer, buffer_length, &decrypted_buffer, CERT_ROOT)) >= 0){
441
fwrite (decrypted_buffer, 1, decrypted_buffer_size, stdout);
442
free(decrypted_buffer);
451
fprintf(stderr, "Closing tls session\n");
455
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
458
gnutls_deinit (es.session);
459
gnutls_certificate_free_credentials (es.cred);
460
gnutls_global_deinit ();
987
static void resolve_callback(AvahiSServiceResolver *r,
988
AvahiIfIndex interface,
990
AvahiResolverEvent event,
994
const char *host_name,
995
const AvahiAddress *address,
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
AVAHI_GCC_UNUSED void* userdata){
1003
/* Called whenever a service has been resolved successfully or
1012
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
avahi_strerror(avahi_server_errno(mc.server)));
1019
case AVAHI_RESOLVER_FOUND:
1021
char ip[AVAHI_ADDRESS_STR_MAX];
1022
avahi_address_snprint(ip, sizeof(ip), address);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, ip, (intmax_t)interface, port);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1031
avahi_simple_poll_quit(mc.simple_poll);
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
1038
avahi_s_service_resolver_free(r);
1041
static void browse_callback(AvahiSServiceBrowser *b,
1042
AvahiIfIndex interface,
1043
AvahiProtocol protocol,
1044
AvahiBrowserEvent event,
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1050
AVAHI_GCC_UNUSED void* userdata){
1053
/* Called whenever a new services becomes available on the LAN or
1054
is removed from the LAN */
1062
case AVAHI_BROWSER_FAILURE:
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1069
case AVAHI_BROWSER_NEW:
1070
/* We ignore the returned Avahi resolver object. In the callback
1071
function we free it. If the Avahi server is terminated before
1072
the callback function is called the Avahi server will free the
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1080
avahi_strerror(avahi_server_errno(mc.server)));
1083
case AVAHI_BROWSER_REMOVE:
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1089
fprintf_plus(stderr, "No Mandos server found, still"
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
1102
signal_received = sig;
1103
int old_errno = errno;
1104
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1116
perror_plus("socket");
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1165
/* Accept this device */
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1183
if(not get_flags(if_entry->d_name, &ifr)){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1191
if(not good_flags(if_entry->d_name, &ifr)){
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1234
if(not good_flags(if_entry->d_name, &ifr)){
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1257
if((direntry->d_name)[0] == '\0'){
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1278
perror_plus("asprintf");
1282
ret = stat(fullname, &st);
1285
perror_plus("Could not stat hook");
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1319
if(mc.current_server == NULL){
1321
fprintf_plus(stderr, "Wait until first server is found."
1324
ret = avahi_simple_poll_iterate(s, -1);
1327
fprintf_plus(stderr, "Check current_server if we should run"
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1333
perror_plus("clock_gettime");
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1360
avahi_simple_poll_quit(mc.simple_poll);
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1366
perror_plus("clock_gettime");
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1384
bool run_network_hooks(const char *mode, const char *interface,
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1392
perror_plus("scandir");
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1400
perror_plus("asprintf");
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1407
pid_t hook_pid = fork();
1410
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1426
perror_plus("setgid");
1428
/* Reset supplementary groups */
1430
ret = setgroups(0, NULL);
1432
perror_plus("setgroups");
1434
dup2(devnull, STDIN_FILENO);
1436
dup2(STDERR_FILENO, STDOUT_FILENO);
1437
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1439
perror_plus("setenv");
1442
ret = setenv("DEVICE", interface, 1);
1444
perror_plus("setenv");
1447
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1449
perror_plus("setenv");
1452
ret = setenv("MODE", mode, 1);
1454
perror_plus("setenv");
1458
ret = asprintf(&delaystring, "%f", delay);
1460
perror_plus("asprintf");
1463
ret = setenv("DELAY", delaystring, 1);
1466
perror_plus("setenv");
1470
ret = execl(fullname, direntry->d_name, mode, NULL);
1471
perror_plus("execl");
1474
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1475
perror_plus("waitpid");
1479
if(WIFEXITED(status)){
1480
if(WEXITSTATUS(status) != 0){
1481
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1482
" with status %d\n", direntry->d_name,
1483
WEXITSTATUS(status));
1487
} else if(WIFSIGNALED(status)){
1488
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1489
" signal %d\n", direntry->d_name,
1494
fprintf_plus(stderr, "Warning: network hook \"%s\""
1495
" crashed\n", direntry->d_name);
1502
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1511
int main(int argc, char *argv[]){
1512
AvahiSServiceBrowser *sb = NULL;
1517
int exitcode = EXIT_SUCCESS;
1518
const char *interface = "";
1519
struct ifreq network;
1521
bool take_down_interface = false;
1524
char tempdir[] = "/tmp/mandosXXXXXX";
1525
bool tempdir_created = false;
1526
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1527
const char *seckey = PATHDIR "/" SECKEY;
1528
const char *pubkey = PATHDIR "/" PUBKEY;
1530
bool gnutls_initialized = false;
1531
bool gpgme_initialized = false;
1533
double retry_interval = 10; /* 10s between trying a server and
1534
retrying the same server again */
1536
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1537
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1542
/* Lower any group privileges we might have, just to be safe */
1546
perror_plus("setgid");
1549
/* Lower user privileges (temporarily) */
1553
perror_plus("seteuid");
1561
struct argp_option options[] = {
1562
{ .name = "debug", .key = 128,
1563
.doc = "Debug mode", .group = 3 },
1564
{ .name = "connect", .key = 'c',
1565
.arg = "ADDRESS:PORT",
1566
.doc = "Connect directly to a specific Mandos server",
1568
{ .name = "interface", .key = 'i',
1570
.doc = "Network interface that will be used to search for"
1573
{ .name = "seckey", .key = 's',
1575
.doc = "OpenPGP secret key file base name",
1577
{ .name = "pubkey", .key = 'p',
1579
.doc = "OpenPGP public key file base name",
1581
{ .name = "dh-bits", .key = 129,
1583
.doc = "Bit length of the prime number used in the"
1584
" Diffie-Hellman key exchange",
1586
{ .name = "priority", .key = 130,
1588
.doc = "GnuTLS priority string for the TLS handshake",
1590
{ .name = "delay", .key = 131,
1592
.doc = "Maximum delay to wait for interface startup",
1594
{ .name = "retry", .key = 132,
1596
.doc = "Retry interval used when denied by the mandos server",
1598
{ .name = "network-hook-dir", .key = 133,
1600
.doc = "Directory where network hooks are located",
1603
* These reproduce what we would get without ARGP_NO_HELP
1605
{ .name = "help", .key = '?',
1606
.doc = "Give this help list", .group = -1 },
1607
{ .name = "usage", .key = -3,
1608
.doc = "Give a short usage message", .group = -1 },
1609
{ .name = "version", .key = 'V',
1610
.doc = "Print program version", .group = -1 },
1614
error_t parse_opt(int key, char *arg,
1615
struct argp_state *state){
1618
case 128: /* --debug */
1621
case 'c': /* --connect */
1624
case 'i': /* --interface */
1627
case 's': /* --seckey */
1630
case 'p': /* --pubkey */
1633
case 129: /* --dh-bits */
1635
tmpmax = strtoimax(arg, &tmp, 10);
1636
if(errno != 0 or tmp == arg or *tmp != '\0'
1637
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1638
argp_error(state, "Bad number of DH bits");
1640
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1642
case 130: /* --priority */
1645
case 131: /* --delay */
1647
delay = strtof(arg, &tmp);
1648
if(errno != 0 or tmp == arg or *tmp != '\0'){
1649
argp_error(state, "Bad delay");
1651
case 132: /* --retry */
1653
retry_interval = strtod(arg, &tmp);
1654
if(errno != 0 or tmp == arg or *tmp != '\0'
1655
or (retry_interval * 1000) > INT_MAX
1656
or retry_interval < 0){
1657
argp_error(state, "Bad retry interval");
1660
case 133: /* --network-hook-dir */
1664
* These reproduce what we would get without ARGP_NO_HELP
1666
case '?': /* --help */
1667
argp_state_help(state, state->out_stream,
1668
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1669
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1670
case -3: /* --usage */
1671
argp_state_help(state, state->out_stream,
1672
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1673
case 'V': /* --version */
1674
fprintf_plus(state->out_stream,
1675
"Mandos plugin mandos-client: ");
1676
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1677
exit(argp_err_exit_status);
1680
return ARGP_ERR_UNKNOWN;
1685
struct argp argp = { .options = options, .parser = parse_opt,
1687
.doc = "Mandos client -- Get and decrypt"
1688
" passwords from a Mandos server" };
1689
ret = argp_parse(&argp, argc, argv,
1690
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1697
perror_plus("argp_parse");
1698
exitcode = EX_OSERR;
1701
exitcode = EX_USAGE;
1707
/* Work around Debian bug #633582:
1708
<http://bugs.debian.org/633582> */
1710
/* Re-raise priviliges */
1714
perror_plus("seteuid");
1718
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1719
int seckey_fd = open(seckey, O_RDONLY);
1720
if(seckey_fd == -1){
1721
perror_plus("open");
1723
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1725
perror_plus("fstat");
1727
if(S_ISREG(st.st_mode)
1728
and st.st_uid == 0 and st.st_gid == 0){
1729
ret = fchown(seckey_fd, uid, gid);
1731
perror_plus("fchown");
1735
TEMP_FAILURE_RETRY(close(seckey_fd));
1739
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1740
int pubkey_fd = open(pubkey, O_RDONLY);
1741
if(pubkey_fd == -1){
1742
perror_plus("open");
1744
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1746
perror_plus("fstat");
1748
if(S_ISREG(st.st_mode)
1749
and st.st_uid == 0 and st.st_gid == 0){
1750
ret = fchown(pubkey_fd, uid, gid);
1752
perror_plus("fchown");
1756
TEMP_FAILURE_RETRY(close(pubkey_fd));
1760
/* Lower privileges */
1764
perror_plus("seteuid");
1769
/* Run network hooks */
1770
if(not run_network_hooks("start", interface, delay)){
1775
avahi_set_log_function(empty_log);
1778
if(interface[0] == '\0'){
1779
struct dirent **direntries;
1780
/* First look for interfaces that are up */
1781
ret = scandir(sys_class_net, &direntries, up_interface,
1784
/* No up interfaces, look for any good interfaces */
1786
ret = scandir(sys_class_net, &direntries, good_interface,
1790
/* Pick the first interface returned */
1791
interface = strdup(direntries[0]->d_name);
1793
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1795
if(interface == NULL){
1796
perror_plus("malloc");
1798
exitcode = EXIT_FAILURE;
1804
fprintf_plus(stderr, "Could not find a network interface\n");
1805
exitcode = EXIT_FAILURE;
1810
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1811
from the signal handler */
1812
/* Initialize the pseudo-RNG for Avahi */
1813
srand((unsigned int) time(NULL));
1814
mc.simple_poll = avahi_simple_poll_new();
1815
if(mc.simple_poll == NULL){
1816
fprintf_plus(stderr,
1817
"Avahi: Failed to create simple poll object.\n");
1818
exitcode = EX_UNAVAILABLE;
1822
sigemptyset(&sigterm_action.sa_mask);
1823
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1825
perror_plus("sigaddset");
1826
exitcode = EX_OSERR;
1829
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1831
perror_plus("sigaddset");
1832
exitcode = EX_OSERR;
1835
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1837
perror_plus("sigaddset");
1838
exitcode = EX_OSERR;
1841
/* Need to check if the handler is SIG_IGN before handling:
1842
| [[info:libc:Initial Signal Actions]] |
1843
| [[info:libc:Basic Signal Handling]] |
1845
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1847
perror_plus("sigaction");
1850
if(old_sigterm_action.sa_handler != SIG_IGN){
1851
ret = sigaction(SIGINT, &sigterm_action, NULL);
1853
perror_plus("sigaction");
1854
exitcode = EX_OSERR;
1858
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1860
perror_plus("sigaction");
1863
if(old_sigterm_action.sa_handler != SIG_IGN){
1864
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1866
perror_plus("sigaction");
1867
exitcode = EX_OSERR;
1871
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1873
perror_plus("sigaction");
1876
if(old_sigterm_action.sa_handler != SIG_IGN){
1877
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1879
perror_plus("sigaction");
1880
exitcode = EX_OSERR;
1885
/* If the interface is down, bring it up */
1886
if(strcmp(interface, "none") != 0){
1887
if_index = (AvahiIfIndex) if_nametoindex(interface);
1889
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1890
exitcode = EX_UNAVAILABLE;
1898
/* Re-raise priviliges */
1902
perror_plus("seteuid");
1906
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1907
messages about the network interface to mess up the prompt */
1908
ret = klogctl(8, NULL, 5);
1909
bool restore_loglevel = true;
1911
restore_loglevel = false;
1912
perror_plus("klogctl");
1914
#endif /* __linux__ */
1916
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1918
perror_plus("socket");
1919
exitcode = EX_OSERR;
1921
if(restore_loglevel){
1922
ret = klogctl(7, NULL, 0);
1924
perror_plus("klogctl");
1927
#endif /* __linux__ */
1928
/* Lower privileges */
1932
perror_plus("seteuid");
1936
strcpy(network.ifr_name, interface);
1937
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1939
perror_plus("ioctl SIOCGIFFLAGS");
1941
if(restore_loglevel){
1942
ret = klogctl(7, NULL, 0);
1944
perror_plus("klogctl");
1947
#endif /* __linux__ */
1948
exitcode = EX_OSERR;
1949
/* Lower privileges */
1953
perror_plus("seteuid");
1957
if((network.ifr_flags & IFF_UP) == 0){
1958
network.ifr_flags |= IFF_UP;
1959
take_down_interface = true;
1960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1962
take_down_interface = false;
1963
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1964
exitcode = EX_OSERR;
1966
if(restore_loglevel){
1967
ret = klogctl(7, NULL, 0);
1969
perror_plus("klogctl");
1972
#endif /* __linux__ */
1973
/* Lower privileges */
1977
perror_plus("seteuid");
1982
/* Sleep checking until interface is running.
1983
Check every 0.25s, up to total time of delay */
1984
for(int i=0; i < delay * 4; i++){
1985
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1987
perror_plus("ioctl SIOCGIFFLAGS");
1988
} else if(network.ifr_flags & IFF_RUNNING){
1991
struct timespec sleeptime = { .tv_nsec = 250000000 };
1992
ret = nanosleep(&sleeptime, NULL);
1993
if(ret == -1 and errno != EINTR){
1994
perror_plus("nanosleep");
1997
if(not take_down_interface){
1998
/* We won't need the socket anymore */
1999
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2001
perror_plus("close");
2005
if(restore_loglevel){
2006
/* Restores kernel loglevel to default */
2007
ret = klogctl(7, NULL, 0);
2009
perror_plus("klogctl");
2012
#endif /* __linux__ */
2013
/* Lower privileges */
2015
/* Lower privileges */
2018
perror_plus("seteuid");
2026
ret = init_gnutls_global(pubkey, seckey);
2028
fprintf_plus(stderr, "init_gnutls_global failed\n");
2029
exitcode = EX_UNAVAILABLE;
2032
gnutls_initialized = true;
2039
if(mkdtemp(tempdir) == NULL){
2040
perror_plus("mkdtemp");
2043
tempdir_created = true;
2049
if(not init_gpgme(pubkey, seckey, tempdir)){
2050
fprintf_plus(stderr, "init_gpgme failed\n");
2051
exitcode = EX_UNAVAILABLE;
2054
gpgme_initialized = true;
2061
if(connect_to != NULL){
2062
/* Connect directly, do not use Zeroconf */
2063
/* (Mainly meant for debugging) */
2064
char *address = strrchr(connect_to, ':');
2065
if(address == NULL){
2066
fprintf_plus(stderr, "No colon in address\n");
2067
exitcode = EX_USAGE;
2077
tmpmax = strtoimax(address+1, &tmp, 10);
2078
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2079
or tmpmax != (uint16_t)tmpmax){
2080
fprintf_plus(stderr, "Bad port number\n");
2081
exitcode = EX_USAGE;
2089
port = (uint16_t)tmpmax;
2091
/* Colon in address indicates IPv6 */
2093
if(strchr(connect_to, ':') != NULL){
2095
/* Accept [] around IPv6 address - see RFC 5952 */
2096
if(connect_to[0] == '[' and address[-1] == ']')
2104
address = connect_to;
2110
while(not quit_now){
2111
ret = start_mandos_communication(address, port, if_index, af);
2112
if(quit_now or ret == 0){
2116
fprintf_plus(stderr, "Retrying in %d seconds\n",
2117
(int)retry_interval);
2119
sleep((int)retry_interval);
2123
exitcode = EXIT_SUCCESS;
464
static AvahiSimplePoll *simple_poll = NULL;
465
static AvahiServer *server = NULL;
467
static void resolve_callback(
468
AvahiSServiceResolver *r,
469
AVAHI_GCC_UNUSED AvahiIfIndex interface,
470
AVAHI_GCC_UNUSED AvahiProtocol protocol,
471
AvahiResolverEvent event,
475
const char *host_name,
476
const AvahiAddress *address,
478
AvahiStringList *txt,
479
AvahiLookupResultFlags flags,
480
AVAHI_GCC_UNUSED void* userdata) {
484
/* Called whenever a service has been resolved successfully or timed out */
487
case AVAHI_RESOLVER_FAILURE:
488
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
491
case AVAHI_RESOLVER_FOUND: {
492
char ip[AVAHI_ADDRESS_STR_MAX];
493
avahi_address_snprint(ip, sizeof(ip), address);
495
fprintf(stderr, "Mandos server found at %s on port %d\n", ip, port);
497
int ret = start_mandos_communication(ip, port);
505
avahi_s_service_resolver_free(r);
508
static void browse_callback(
509
AvahiSServiceBrowser *b,
510
AvahiIfIndex interface,
511
AvahiProtocol protocol,
512
AvahiBrowserEvent event,
516
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
519
AvahiServer *s = userdata;
522
/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
526
case AVAHI_BROWSER_FAILURE:
528
fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
529
avahi_simple_poll_quit(simple_poll);
532
case AVAHI_BROWSER_NEW:
533
/* We ignore the returned resolver object. In the callback
534
function we free it. If the server is terminated before
535
the callback function is called the server will free
536
the resolver for us. */
538
if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_INET6, 0, resolve_callback, s)))
539
fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
543
case AVAHI_BROWSER_REMOVE:
546
case AVAHI_BROWSER_ALL_FOR_NOW:
547
case AVAHI_BROWSER_CACHE_EXHAUSTED:
552
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
2134
553
AvahiServerConfig config;
2135
/* Do not publish any local Zeroconf records */
554
AvahiSServiceBrowser *sb = NULL;
555
const char db[] = "--debug";
558
int returncode = EXIT_SUCCESS;
559
char *basename = rindex(argv[0], '/');
560
if(basename == NULL){
566
char *program_name = malloc(strlen(basename) + sizeof(db));
568
if (program_name == NULL){
573
program_name[0] = '\0';
575
for (int i = 1; i < argc; i++){
576
if (not strncmp(argv[i], db, 5)){
577
strcat(strcat(strcat(program_name, db ), "="), basename);
578
if(not strcmp(argv[i], db) or not strcmp(argv[i], program_name)){
586
avahi_set_log_function(empty_log);
589
/* Initialize the psuedo-RNG */
592
/* Allocate main loop object */
593
if (!(simple_poll = avahi_simple_poll_new())) {
594
fprintf(stderr, "Failed to create simple poll object.\n");
599
/* Do not publish any local records */
2136
600
avahi_server_config_init(&config);
2137
601
config.publish_hinfo = 0;
2138
602
config.publish_addresses = 0;
2139
603
config.publish_workstation = 0;
2140
604
config.publish_domain = 0;
2142
606
/* Allocate a new server */
2143
mc.server = avahi_server_new(avahi_simple_poll_get
2144
(mc.simple_poll), &config, NULL,
2147
/* Free the Avahi configuration data */
607
server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
609
/* Free the configuration data */
2148
610
avahi_server_config_free(&config);
2151
/* Check if creating the Avahi server object succeeded */
2152
if(mc.server == NULL){
2153
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2154
avahi_strerror(error));
2155
exitcode = EX_UNAVAILABLE;
2163
/* Create the Avahi service browser */
2164
sb = avahi_s_service_browser_new(mc.server, if_index,
2165
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2166
NULL, 0, browse_callback, NULL);
2168
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2169
avahi_strerror(avahi_server_errno(mc.server)));
2170
exitcode = EX_UNAVAILABLE;
2178
/* Run the main loop */
2181
fprintf_plus(stderr, "Starting Avahi loop search\n");
2184
ret = avahi_loop_with_timeout(mc.simple_poll,
2185
(int)(retry_interval * 1000));
2187
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2188
(ret == 0) ? "successfully" : "with error");
2194
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2197
/* Cleanup things */
2199
avahi_s_service_browser_free(sb);
2201
if(mc.server != NULL)
2202
avahi_server_free(mc.server);
2204
if(mc.simple_poll != NULL)
2205
avahi_simple_poll_free(mc.simple_poll);
2207
if(gnutls_initialized){
2208
gnutls_certificate_free_credentials(mc.cred);
2209
gnutls_global_deinit();
2210
gnutls_dh_params_deinit(mc.dh_params);
2213
if(gpgme_initialized){
2214
gpgme_release(mc.ctx);
2217
/* Cleans up the circular linked list of Mandos servers the client
2219
if(mc.current_server != NULL){
2220
mc.current_server->prev->next = NULL;
2221
while(mc.current_server != NULL){
2222
server *next = mc.current_server->next;
2223
free(mc.current_server);
2224
mc.current_server = next;
2228
/* Run network hooks */
2229
run_network_hooks("stop", interface, delay);
2231
/* Re-raise priviliges */
2236
perror_plus("seteuid");
2239
/* Take down the network interface */
2240
if(take_down_interface and geteuid() == 0){
2241
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2243
perror_plus("ioctl SIOCGIFFLAGS");
2244
} else if(network.ifr_flags & IFF_UP){
2245
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2246
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2248
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2251
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2253
perror_plus("close");
2257
/* Lower privileges permanently */
2261
perror_plus("setuid");
2264
/* Removes the GPGME temp directory and all files inside */
2265
if(tempdir_created){
2266
struct dirent **direntries = NULL;
2267
struct dirent *direntry = NULL;
2268
int numentries = scandir(tempdir, &direntries, notdotentries,
2270
if (numentries > 0){
2271
for(int i = 0; i < numentries; i++){
2272
direntry = direntries[i];
2273
char *fullname = NULL;
2274
ret = asprintf(&fullname, "%s/%s", tempdir,
2277
perror_plus("asprintf");
2280
ret = remove(fullname);
2282
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2289
/* need to clean even if 0 because man page doesn't specify */
2291
if (numentries == -1){
2292
perror_plus("scandir");
2294
ret = rmdir(tempdir);
2295
if(ret == -1 and errno != ENOENT){
2296
perror_plus("rmdir");
2301
sigemptyset(&old_sigterm_action.sa_mask);
2302
old_sigterm_action.sa_handler = SIG_DFL;
2303
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2304
&old_sigterm_action,
2307
perror_plus("sigaction");
2310
ret = raise(signal_received);
2311
} while(ret != 0 and errno == EINTR);
2313
perror_plus("raise");
2316
TEMP_FAILURE_RETRY(pause());
612
/* Check if creating the server object succeeded */
614
fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
615
returncode = EXIT_FAILURE;
619
/* Create the service browser */
620
if (!(sb = avahi_s_service_browser_new(server, if_nametoindex("eth0"), AVAHI_PROTO_INET6, "_mandos._tcp", NULL, 0, browse_callback, server))) {
621
fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
622
returncode = EXIT_FAILURE;
626
/* Run the main loop */
629
fprintf(stderr, "Starting avahi loop search\n");
632
avahi_simple_poll_loop(simple_poll);
637
fprintf(stderr, "%s exiting\n", argv[0]);
642
avahi_s_service_browser_free(sb);
645
avahi_server_free(server);
648
avahi_simple_poll_free(simple_poll);