45
94
#include <avahi-common/malloc.h>
46
95
#include <avahi-common/error.h>
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
63
#include <errno.h> /* perror() */
98
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
101
init_gnutls_session(),
103
#include <gnutls/openpgp.h>
104
/* gnutls_certificate_set_openpgp_key_file(),
105
GNUTLS_OPENPGP_FMT_BASE64 */
108
#include <gpgme.h> /* All GPGME types, constants and
111
GPGME_PROTOCOL_OpenPGP,
69
114
#define BUFFER_SIZE 256
72
const char *certdir = "/conf/conf.d/cryptkeyreq/";
73
const char *certfile = "openpgp-client.txt";
74
const char *certkey = "openpgp-client-key.txt";
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
76
120
bool debug = false;
121
static const char mandos_protocol_version[] = "1";
122
const char *argp_program_version = "mandos-client " VERSION;
123
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
125
/* Used for passing in values through the Avahi callback functions */
79
gnutls_session_t session;
127
AvahiSimplePoll *simple_poll;
80
129
gnutls_certificate_credentials_t cred;
130
unsigned int dh_bits;
81
131
gnutls_dh_params_t dh_params;
85
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
86
char **new_packet, const char *homedir){
87
gpgme_data_t dh_crypto, dh_plain;
132
const char *priority;
136
/* global context so signal handler can reach it*/
137
mandos_context mc = { .simple_poll = NULL, .server = NULL,
138
.dh_bits = 1024, .priority = "SECURE256"
139
":!CTYPE-X.509:+CTYPE-OPENPGP" };
142
* Make additional room in "buffer" for at least BUFFER_SIZE more
143
* bytes. "buffer_capacity" is how much is currently allocated,
144
* "buffer_length" is how much is already used.
146
size_t incbuffer(char **buffer, size_t buffer_length,
147
size_t buffer_capacity){
148
if(buffer_length + BUFFER_SIZE > buffer_capacity){
149
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
153
buffer_capacity += BUFFER_SIZE;
155
return buffer_capacity;
161
static bool init_gpgme(const char *seckey,
162
const char *pubkey, const char *tempdir){
91
ssize_t new_packet_capacity = 0;
92
ssize_t new_packet_length = 0;
93
165
gpgme_engine_info_t engine_info;
96
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
169
* Helper function to insert pub and seckey to the engine keyring.
171
bool import_key(const char *filename){
173
gpgme_data_t pgp_data;
175
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
181
rc = gpgme_data_new_from_fd(&pgp_data, fd);
182
if(rc != GPG_ERR_NO_ERROR){
183
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
184
gpgme_strsource(rc), gpgme_strerror(rc));
188
rc = gpgme_op_import(mc.ctx, pgp_data);
189
if(rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
195
ret = (int)TEMP_FAILURE_RETRY(close(fd));
199
gpgme_data_release(pgp_data);
204
fprintf(stderr, "Initializing GPGME\n");
100
208
gpgme_check_version(NULL);
101
209
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
102
if (rc != GPG_ERR_NO_ERROR){
210
if(rc != GPG_ERR_NO_ERROR){
103
211
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
104
212
gpgme_strsource(rc), gpgme_strerror(rc));
108
/* Set GPGME home directory */
109
rc = gpgme_get_engine_info (&engine_info);
110
if (rc != GPG_ERR_NO_ERROR){
216
/* Set GPGME home directory for the OpenPGP engine only */
217
rc = gpgme_get_engine_info(&engine_info);
218
if(rc != GPG_ERR_NO_ERROR){
111
219
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
112
220
gpgme_strsource(rc), gpgme_strerror(rc));
115
223
while(engine_info != NULL){
116
224
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
117
225
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
118
engine_info->file_name, homedir);
226
engine_info->file_name, tempdir);
121
229
engine_info = engine_info->next;
123
231
if(engine_info == NULL){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
130
if (rc != GPG_ERR_NO_ERROR){
232
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
236
/* Create new GPGME "context" */
237
rc = gpgme_new(&(mc.ctx));
238
if(rc != GPG_ERR_NO_ERROR){
239
fprintf(stderr, "bad gpgme_new: %s: %s\n",
240
gpgme_strsource(rc), gpgme_strerror(rc));
244
if(not import_key(pubkey) or not import_key(seckey)){
252
* Decrypt OpenPGP data.
253
* Returns -1 on error
255
static ssize_t pgp_packet_decrypt(const char *cryptotext,
258
gpgme_data_t dh_crypto, dh_plain;
261
size_t plaintext_capacity = 0;
262
ssize_t plaintext_length = 0;
265
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
268
/* Create new GPGME data buffer from memory cryptotext */
269
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
271
if(rc != GPG_ERR_NO_ERROR){
131
272
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
132
273
gpgme_strsource(rc), gpgme_strerror(rc));
136
277
/* Create new empty GPGME data buffer for the plaintext */
137
278
rc = gpgme_data_new(&dh_plain);
138
if (rc != GPG_ERR_NO_ERROR){
279
if(rc != GPG_ERR_NO_ERROR){
139
280
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
140
281
gpgme_strsource(rc), gpgme_strerror(rc));
144
/* Create new GPGME "context" */
145
rc = gpgme_new(&ctx);
146
if (rc != GPG_ERR_NO_ERROR){
147
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
gpgme_strsource(rc), gpgme_strerror(rc));
152
/* Decrypt data from the FILE pointer to the plaintext data
154
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
if (rc != GPG_ERR_NO_ERROR){
282
gpgme_data_release(dh_crypto);
286
/* Decrypt data from the cryptotext data buffer to the plaintext
288
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
289
if(rc != GPG_ERR_NO_ERROR){
156
290
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
157
291
gpgme_strsource(rc), gpgme_strerror(rc));
292
plaintext_length = -1;
294
gpgme_decrypt_result_t result;
295
result = gpgme_op_decrypt_result(mc.ctx);
297
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
299
fprintf(stderr, "Unsupported algorithm: %s\n",
300
result->unsupported_algorithm);
301
fprintf(stderr, "Wrong key usage: %u\n",
302
result->wrong_key_usage);
303
if(result->file_name != NULL){
304
fprintf(stderr, "File name: %s\n", result->file_name);
306
gpgme_recipient_t recipient;
307
recipient = result->recipients;
309
while(recipient != NULL){
310
fprintf(stderr, "Public key algorithm: %s\n",
311
gpgme_pubkey_algo_name(recipient->pubkey_algo));
312
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
313
fprintf(stderr, "Secret key available: %s\n",
314
recipient->status == GPG_ERR_NO_SECKEY
316
recipient = recipient->next;
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
gpgme_decrypt_result_t result;
167
result = gpgme_op_decrypt_result(ctx);
169
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
171
fprintf(stderr, "Unsupported algorithm: %s\n",
172
result->unsupported_algorithm);
173
fprintf(stderr, "Wrong key usage: %d\n",
174
result->wrong_key_usage);
175
if(result->file_name != NULL){
176
fprintf(stderr, "File name: %s\n", result->file_name);
178
gpgme_recipient_t recipient;
179
recipient = result->recipients;
181
while(recipient != NULL){
182
fprintf(stderr, "Public key algorithm: %s\n",
183
gpgme_pubkey_algo_name(recipient->pubkey_algo));
184
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
185
fprintf(stderr, "Secret key available: %s\n",
186
recipient->status == GPG_ERR_NO_SECKEY
188
recipient = recipient->next;
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
197
328
/* Seek back to the beginning of the GPGME plaintext data buffer */
198
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
199
perror("pgpme_data_seek");
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
331
plaintext_length = -1;
204
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
205
*new_packet = realloc(*new_packet,
206
(unsigned int)new_packet_capacity
208
if (*new_packet == NULL){
212
new_packet_capacity += BUFFER_SIZE;
337
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
340
if(plaintext_capacity == 0){
342
plaintext_length = -1;
215
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
217
348
/* Print the data, if any */
222
354
perror("gpgme_data_read");
225
new_packet_length += ret;
228
/* FIXME: check characters before printing to screen so to not print
229
terminal control characters */
231
/* fprintf(stderr, "decrypted password is: "); */
232
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
233
/* fprintf(stderr, "\n"); */
355
plaintext_length = -1;
358
plaintext_length += ret;
362
fprintf(stderr, "Decrypted password is: ");
363
for(ssize_t i = 0; i < plaintext_length; i++){
364
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
366
fprintf(stderr, "\n");
371
/* Delete the GPGME cryptotext data buffer */
372
gpgme_data_release(dh_crypto);
236
374
/* Delete the GPGME plaintext data buffer */
237
375
gpgme_data_release(dh_plain);
238
return new_packet_length;
376
return plaintext_length;
241
static const char * safer_gnutls_strerror (int value) {
242
const char *ret = gnutls_strerror (value);
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
244
383
ret = "(unknown)";
248
void debuggnutls(__attribute__((unused)) int level,
250
fprintf(stderr, "%s", string);
387
/* GnuTLS log function callback */
388
static void debuggnutls(__attribute__((unused)) int level,
390
fprintf(stderr, "GnuTLS: %s", string);
253
int initgnutls(encrypted_session *es){
393
static int init_gnutls_global(const char *pubkeyfilename,
394
const char *seckeyfilename){
258
398
fprintf(stderr, "Initializing GnuTLS\n");
261
if ((ret = gnutls_global_init ())
262
!= GNUTLS_E_SUCCESS) {
263
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
401
ret = gnutls_global_init();
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
409
/* "Use a log level over 10 to enable all debugging options."
268
412
gnutls_global_set_log_level(11);
269
413
gnutls_global_set_log_function(debuggnutls);
272
/* openpgp credentials */
273
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
274
!= GNUTLS_E_SUCCESS) {
275
fprintf (stderr, "memory error: %s\n",
276
safer_gnutls_strerror(ret));
416
/* OpenPGP credentials */
417
gnutls_certificate_allocate_credentials(&mc.cred);
418
if(ret != GNUTLS_E_SUCCESS){
419
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
423
safer_gnutls_strerror(ret));
424
gnutls_global_deinit();
281
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
282
" and keyfile %s as GnuTLS credentials\n", certfile,
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
286
434
ret = gnutls_certificate_set_openpgp_key_file
287
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
288
if (ret != GNUTLS_E_SUCCESS) {
290
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
292
ret, certfile, certkey);
293
fprintf(stdout, "The Error is: %s\n",
294
safer_gnutls_strerror(ret));
298
//GnuTLS server initialization
299
if ((ret = gnutls_dh_params_init (&es->dh_params))
300
!= GNUTLS_E_SUCCESS) {
301
fprintf (stderr, "Error in dh parameter initialization: %s\n",
302
safer_gnutls_strerror(ret));
306
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
307
!= GNUTLS_E_SUCCESS) {
308
fprintf (stderr, "Error in prime generation: %s\n",
309
safer_gnutls_strerror(ret));
313
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
315
// GnuTLS session creation
316
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
317
!= GNUTLS_E_SUCCESS){
435
(mc.cred, pubkeyfilename, seckeyfilename,
436
GNUTLS_OPENPGP_FMT_BASE64);
437
if(ret != GNUTLS_E_SUCCESS){
439
"Error[%d] while reading the OpenPGP key pair ('%s',"
440
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
441
fprintf(stderr, "The GnuTLS error is: %s\n",
442
safer_gnutls_strerror(ret));
446
/* GnuTLS server initialization */
447
ret = gnutls_dh_params_init(&mc.dh_params);
448
if(ret != GNUTLS_E_SUCCESS){
449
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
450
" %s\n", safer_gnutls_strerror(ret));
453
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
454
if(ret != GNUTLS_E_SUCCESS){
455
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
456
safer_gnutls_strerror(ret));
460
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
466
gnutls_certificate_free_credentials(mc.cred);
467
gnutls_global_deinit();
468
gnutls_dh_params_deinit(mc.dh_params);
472
static int init_gnutls_session(gnutls_session_t *session){
474
/* GnuTLS session creation */
475
ret = gnutls_init(session, GNUTLS_SERVER);
476
if(ret != GNUTLS_E_SUCCESS){
318
477
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
319
478
safer_gnutls_strerror(ret));
322
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf(stderr, "Syntax error at: %s\n", err);
325
fprintf(stderr, "GnuTLS error: %s\n",
326
safer_gnutls_strerror(ret));
483
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
484
if(ret != GNUTLS_E_SUCCESS){
485
fprintf(stderr, "Syntax error at: %s\n", err);
486
fprintf(stderr, "GnuTLS error: %s\n",
487
safer_gnutls_strerror(ret));
488
gnutls_deinit(*session);
330
if ((ret = gnutls_credentials_set
331
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
332
!= GNUTLS_E_SUCCESS) {
333
fprintf(stderr, "Error setting a credentials set: %s\n",
493
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
495
if(ret != GNUTLS_E_SUCCESS){
496
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
334
497
safer_gnutls_strerror(ret));
498
gnutls_deinit(*session);
338
502
/* ignore client certificate if any. */
339
gnutls_certificate_server_set_request (es->session,
503
gnutls_certificate_server_set_request(*session,
342
gnutls_dh_set_prime_bits (es->session, DH_BITS);
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
347
void empty_log(__attribute__((unused)) AvahiLogLevel level,
348
__attribute__((unused)) const char *txt){}
511
/* Avahi log function callback */
512
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
513
__attribute__((unused)) const char *txt){}
350
int start_mandos_communication(const char *ip, uint16_t port,
351
AvahiIfIndex if_index){
515
/* Called when a Mandos server is found */
516
static int start_mandos_communication(const char *ip, uint16_t port,
517
AvahiIfIndex if_index,
353
struct sockaddr_in6 to;
354
encrypted_session es;
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
355
525
char *buffer = NULL;
356
526
char *decrypted_buffer;
357
527
size_t buffer_length = 0;
358
528
size_t buffer_capacity = 0;
359
529
ssize_t decrypted_buffer_size;
362
char interface[IF_NAMESIZE];
532
gnutls_session_t session;
533
int pf; /* Protocol family */
543
fprintf(stderr, "Bad address family: %d\n", af);
547
ret = init_gnutls_session(&session);
365
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
369
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
371
559
perror("socket");
375
if(if_indextoname((unsigned int)if_index, interface) == NULL){
377
perror("if_indextoname");
383
fprintf(stderr, "Binding to interface %s\n", interface);
386
memset(&to,0,sizeof(to)); /* Spurious warning */
387
to.sin6_family = AF_INET6;
388
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
563
memset(&to, 0, sizeof(to));
565
to.in6.sin6_family = (uint16_t)af;
566
ret = inet_pton(af, ip, &to.in6.sin6_addr);
568
to.in.sin_family = (sa_family_t)af;
569
ret = inet_pton(af, ip, &to.in.sin_addr);
390
572
perror("inet_pton");
394
576
fprintf(stderr, "Bad address: %s\n", ip);
397
to.sin6_port = htons(port); /* Spurious warning */
399
to.sin6_scope_id = (uint32_t)if_index;
580
to.in6.sin6_port = htons(port); /* Spurious warnings from
582
-Wunreachable-code */
584
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
585
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
587
if(if_index == AVAHI_IF_UNSPEC){
588
fprintf(stderr, "An IPv6 link-local address is incomplete"
589
" without a network interface\n");
592
/* Set the network interface number as scope */
593
to.in6.sin6_scope_id = (uint32_t)if_index;
596
to.in.sin_port = htons(port); /* Spurious warnings from
598
-Wunreachable-code */
402
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
403
/* char addrstr[INET6_ADDRSTRLEN]; */
404
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
405
/* sizeof(addrstr)) == NULL){ */
406
/* perror("inet_ntop"); */
408
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
409
/* addrstr, ntohs(to.sin6_port)); */
602
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
603
char interface[IF_NAMESIZE];
604
if(if_indextoname((unsigned int)if_index, interface) == NULL){
605
perror("if_indextoname");
607
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
608
ip, interface, port);
611
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
614
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
615
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
618
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
621
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
627
if(strcmp(addrstr, ip) != 0){
628
fprintf(stderr, "Canonical address form: %s\n", addrstr);
413
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
415
639
perror("connect");
419
ret = initgnutls (&es);
643
const char *out = mandos_protocol_version;
646
size_t out_size = strlen(out);
647
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
648
out_size - written));
654
written += (size_t)ret;
655
if(written < out_size){
658
if(out == mandos_protocol_version){
425
gnutls_transport_set_ptr (es.session,
426
(gnutls_transport_ptr_t) tcp_sd);
429
668
fprintf(stderr, "Establishing TLS session with %s\n", ip);
432
ret = gnutls_handshake (es.session);
434
if (ret != GNUTLS_E_SUCCESS){
671
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
674
ret = gnutls_handshake(session);
675
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
677
if(ret != GNUTLS_E_SUCCESS){
436
fprintf(stderr, "\n*** Handshake failed ***\n");
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
443
//Retrieve OpenPGP packet that contains the wanted password
686
/* Read OpenPGP packet that contains the wanted password */
446
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
451
if (buffer_length + BUFFER_SIZE > buffer_capacity){
452
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
457
buffer_capacity += BUFFER_SIZE;
694
buffer_capacity = incbuffer(&buffer, buffer_length,
696
if(buffer_capacity == 0){
460
ret = gnutls_record_recv
461
(es.session, buffer+buffer_length, BUFFER_SIZE);
702
sret = gnutls_record_recv(session, buffer+buffer_length,
467
709
case GNUTLS_E_INTERRUPTED:
468
710
case GNUTLS_E_AGAIN:
470
712
case GNUTLS_E_REHANDSHAKE:
471
ret = gnutls_handshake (es.session);
473
fprintf(stderr, "\n*** Handshake failed ***\n");
714
ret = gnutls_handshake(session);
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
480
724
fprintf(stderr, "Unknown error while reading data from"
481
" encrypted session with mandos server\n");
725
" encrypted session with Mandos server\n");
483
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
487
buffer_length += (size_t) ret;
731
buffer_length += (size_t) sret;
491
if (buffer_length > 0){
736
fprintf(stderr, "Closing TLS session\n");
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
741
if(buffer_length > 0){
492
742
decrypted_buffer_size = pgp_packet_decrypt(buffer,
496
if (decrypted_buffer_size >= 0){
745
if(decrypted_buffer_size >= 0){
497
747
while(written < (size_t) decrypted_buffer_size){
498
ret = (int)fwrite (decrypted_buffer + written, 1,
499
(size_t)decrypted_buffer_size - written,
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
501
751
if(ret == 0 and ferror(stdout)){
503
753
fprintf(stderr, "Error writing encrypted data: %s\n",
566
810
char ip[AVAHI_ADDRESS_STR_MAX];
567
811
avahi_address_snprint(ip, sizeof(ip), address);
569
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
570
" port %d\n", name, host_name, ip, port);
813
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
814
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
815
ip, (intmax_t)interface, port);
572
int ret = start_mandos_communication(ip, port, interface);
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
820
avahi_simple_poll_quit(mc.simple_poll);
578
824
avahi_s_service_resolver_free(r);
581
static void browse_callback(
582
AvahiSServiceBrowser *b,
583
AvahiIfIndex interface,
584
AvahiProtocol protocol,
585
AvahiBrowserEvent event,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
592
AvahiServer *s = userdata;
593
assert(b); /* Spurious warning */
595
/* Called whenever a new services becomes available on the LAN or
596
is removed from the LAN */
600
case AVAHI_BROWSER_FAILURE:
602
fprintf(stderr, "(Browser) %s\n",
603
avahi_strerror(avahi_server_errno(server)));
604
avahi_simple_poll_quit(simple_poll);
607
case AVAHI_BROWSER_NEW:
608
/* We ignore the returned resolver object. In the callback
609
function we free it. If the server is terminated before
610
the callback function is called the server will free
611
the resolver for us. */
613
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
615
AVAHI_PROTO_INET6, 0,
616
resolve_callback, s)))
617
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
618
avahi_strerror(avahi_server_errno(s)));
621
case AVAHI_BROWSER_REMOVE:
624
case AVAHI_BROWSER_ALL_FOR_NOW:
625
case AVAHI_BROWSER_CACHE_EXHAUSTED:
827
static void browse_callback(AvahiSServiceBrowser *b,
828
AvahiIfIndex interface,
829
AvahiProtocol protocol,
830
AvahiBrowserEvent event,
834
AVAHI_GCC_UNUSED AvahiLookupResultFlags
836
AVAHI_GCC_UNUSED void* userdata){
839
/* Called whenever a new services becomes available on the LAN or
840
is removed from the LAN */
844
case AVAHI_BROWSER_FAILURE:
846
fprintf(stderr, "(Avahi browser) %s\n",
847
avahi_strerror(avahi_server_errno(mc.server)));
848
avahi_simple_poll_quit(mc.simple_poll);
851
case AVAHI_BROWSER_NEW:
852
/* We ignore the returned Avahi resolver object. In the callback
853
function we free it. If the Avahi server is terminated before
854
the callback function is called the Avahi server will free the
857
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
858
name, type, domain, protocol, 0,
859
resolve_callback, NULL) == NULL)
860
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
861
name, avahi_strerror(avahi_server_errno(mc.server)));
864
case AVAHI_BROWSER_REMOVE:
867
case AVAHI_BROWSER_ALL_FOR_NOW:
868
case AVAHI_BROWSER_CACHE_EXHAUSTED:
870
fprintf(stderr, "No Mandos server found, still searching...\n");
630
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
631
const char *combinepath(const char *first, const char *second){
876
sig_atomic_t quit_now = 0;
878
/* stop main loop after sigterm has been called */
879
static void handle_sigterm(__attribute__((unused)) int sig){
884
int old_errno = errno;
885
if(mc.simple_poll != NULL){
886
avahi_simple_poll_quit(mc.simple_poll);
891
int main(int argc, char *argv[]){
892
AvahiSServiceBrowser *sb = NULL;
633
tmp = malloc(strlen(first) + strlen(second) + 2);
639
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
647
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
897
int exitcode = EXIT_SUCCESS;
898
const char *interface = "eth0";
899
struct ifreq network;
903
char *connect_to = NULL;
904
char tempdir[] = "/tmp/mandosXXXXXX";
905
bool tempdir_created = false;
906
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
907
const char *seckey = PATHDIR "/" SECKEY;
908
const char *pubkey = PATHDIR "/" PUBKEY;
910
bool gnutls_initialized = false;
911
bool gpgme_initialized = false;
914
struct sigaction old_sigterm_action;
915
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
918
struct argp_option options[] = {
919
{ .name = "debug", .key = 128,
920
.doc = "Debug mode", .group = 3 },
921
{ .name = "connect", .key = 'c',
922
.arg = "ADDRESS:PORT",
923
.doc = "Connect directly to a specific Mandos server",
925
{ .name = "interface", .key = 'i',
927
.doc = "Network interface that will be used to search for"
930
{ .name = "seckey", .key = 's',
932
.doc = "OpenPGP secret key file base name",
934
{ .name = "pubkey", .key = 'p',
936
.doc = "OpenPGP public key file base name",
938
{ .name = "dh-bits", .key = 129,
940
.doc = "Bit length of the prime number used in the"
941
" Diffie-Hellman key exchange",
943
{ .name = "priority", .key = 130,
945
.doc = "GnuTLS priority string for the TLS handshake",
947
{ .name = "delay", .key = 131,
949
.doc = "Maximum delay to wait for interface startup",
954
error_t parse_opt(int key, char *arg,
955
struct argp_state *state){
957
case 128: /* --debug */
960
case 'c': /* --connect */
963
case 'i': /* --interface */
966
case 's': /* --seckey */
969
case 'p': /* --pubkey */
972
case 129: /* --dh-bits */
974
tmpmax = strtoimax(arg, &tmp, 10);
975
if(errno != 0 or tmp == arg or *tmp != '\0'
976
or tmpmax != (typeof(mc.dh_bits))tmpmax){
977
fprintf(stderr, "Bad number of DH bits\n");
980
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
982
case 130: /* --priority */
985
case 131: /* --delay */
987
delay = strtof(arg, &tmp);
988
if(errno != 0 or tmp == arg or *tmp != '\0'){
989
fprintf(stderr, "Bad delay\n");
998
return ARGP_ERR_UNKNOWN;
1003
struct argp argp = { .options = options, .parser = parse_opt,
1005
.doc = "Mandos client -- Get and decrypt"
1006
" passwords from a Mandos server" };
1007
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1008
if(ret == ARGP_ERR_UNKNOWN){
1009
fprintf(stderr, "Unknown error while parsing arguments\n");
1010
exitcode = EXIT_FAILURE;
1016
avahi_set_log_function(empty_log);
1019
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1020
from the signal handler */
1021
/* Initialize the pseudo-RNG for Avahi */
1022
srand((unsigned int) time(NULL));
1023
mc.simple_poll = avahi_simple_poll_new();
1024
if(mc.simple_poll == NULL){
1025
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1026
exitcode = EXIT_FAILURE;
1030
sigemptyset(&sigterm_action.sa_mask);
1031
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1033
perror("sigaddset");
1034
exitcode = EXIT_FAILURE;
1037
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1039
perror("sigaddset");
1040
exitcode = EXIT_FAILURE;
1043
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1045
perror("sigaddset");
1046
exitcode = EXIT_FAILURE;
1049
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1051
perror("sigaction");
1052
exitcode = EXIT_FAILURE;
1056
/* If the interface is down, bring it up */
1057
if(interface[0] != '\0'){
1059
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1060
messages to mess up the prompt */
1061
ret = klogctl(8, NULL, 5);
1062
bool restore_loglevel = true;
1064
restore_loglevel = false;
1067
#endif /* __linux__ */
1069
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1072
exitcode = EXIT_FAILURE;
1074
if(restore_loglevel){
1075
ret = klogctl(7, NULL, 0);
1080
#endif /* __linux__ */
1083
strcpy(network.ifr_name, interface);
1084
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1086
perror("ioctl SIOCGIFFLAGS");
1088
if(restore_loglevel){
1089
ret = klogctl(7, NULL, 0);
1094
#endif /* __linux__ */
1095
exitcode = EXIT_FAILURE;
1098
if((network.ifr_flags & IFF_UP) == 0){
1099
network.ifr_flags |= IFF_UP;
1100
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1102
perror("ioctl SIOCSIFFLAGS");
1103
exitcode = EXIT_FAILURE;
1105
if(restore_loglevel){
1106
ret = klogctl(7, NULL, 0);
1111
#endif /* __linux__ */
1115
/* sleep checking until interface is running */
1116
for(int i=0; i < delay * 4; i++){
1117
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1119
perror("ioctl SIOCGIFFLAGS");
1120
} else if(network.ifr_flags & IFF_RUNNING){
1123
struct timespec sleeptime = { .tv_nsec = 250000000 };
1124
ret = nanosleep(&sleeptime, NULL);
1125
if(ret == -1 and errno != EINTR){
1126
perror("nanosleep");
1129
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1134
if(restore_loglevel){
1135
/* Restores kernel loglevel to default */
1136
ret = klogctl(7, NULL, 0);
1141
#endif /* __linux__ */
1158
ret = init_gnutls_global(pubkey, seckey);
1160
fprintf(stderr, "init_gnutls_global failed\n");
1161
exitcode = EXIT_FAILURE;
1164
gnutls_initialized = true;
1167
if(mkdtemp(tempdir) == NULL){
1171
tempdir_created = true;
1173
if(not init_gpgme(pubkey, seckey, tempdir)){
1174
fprintf(stderr, "init_gpgme failed\n");
1175
exitcode = EXIT_FAILURE;
1178
gpgme_initialized = true;
1181
if(interface[0] != '\0'){
1182
if_index = (AvahiIfIndex) if_nametoindex(interface);
1184
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1185
exitcode = EXIT_FAILURE;
1190
if(connect_to != NULL){
1191
/* Connect directly, do not use Zeroconf */
1192
/* (Mainly meant for debugging) */
1193
char *address = strrchr(connect_to, ':');
1194
if(address == NULL){
1195
fprintf(stderr, "No colon in address\n");
1196
exitcode = EXIT_FAILURE;
1201
tmpmax = strtoimax(address+1, &tmp, 10);
1202
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1203
or tmpmax != (uint16_t)tmpmax){
1204
fprintf(stderr, "Bad port number\n");
1205
exitcode = EXIT_FAILURE;
1208
port = (uint16_t)tmpmax;
1210
address = connect_to;
1211
/* Colon in address indicates IPv6 */
1213
if(strchr(address, ':') != NULL){
1218
ret = start_mandos_communication(address, port, if_index, af);
1220
exitcode = EXIT_FAILURE;
1222
exitcode = EXIT_SUCCESS;
648
1228
AvahiServerConfig config;
649
AvahiSServiceBrowser *sb = NULL;
652
int returncode = EXIT_SUCCESS;
653
const char *interface = NULL;
654
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
655
char *connect_to = NULL;
658
static struct option long_options[] = {
659
{"debug", no_argument, (int *)&debug, 1},
660
{"connect", required_argument, 0, 'C'},
661
{"interface", required_argument, 0, 'i'},
662
{"certdir", required_argument, 0, 'd'},
663
{"certkey", required_argument, 0, 'c'},
664
{"certfile", required_argument, 0, 'k'},
667
int option_index = 0;
668
ret = getopt_long (argc, argv, "i:", long_options,
698
certfile = combinepath(certdir, certfile);
699
if (certfile == NULL){
703
if(interface != NULL){
704
if_index = (AvahiIfIndex) if_nametoindex(interface);
706
fprintf(stderr, "No such interface: \"%s\"\n", interface);
711
if(connect_to != NULL){
712
/* Connect directly, do not use Zeroconf */
713
/* (Mainly meant for debugging) */
714
char *address = strrchr(connect_to, ':');
716
fprintf(stderr, "No colon in address\n");
720
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
722
perror("Bad port number");
726
address = connect_to;
727
ret = start_mandos_communication(address, port, if_index);
735
certkey = combinepath(certdir, certkey);
736
if (certkey == NULL){
741
avahi_set_log_function(empty_log);
744
/* Initialize the psuedo-RNG */
745
srand((unsigned int) time(NULL));
747
/* Allocate main loop object */
748
if (!(simple_poll = avahi_simple_poll_new())) {
749
fprintf(stderr, "Failed to create simple poll object.\n");
754
/* Do not publish any local records */
1229
/* Do not publish any local Zeroconf records */
755
1230
avahi_server_config_init(&config);
756
1231
config.publish_hinfo = 0;
757
1232
config.publish_addresses = 0;
758
1233
config.publish_workstation = 0;
759
1234
config.publish_domain = 0;
761
1236
/* Allocate a new server */
762
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
763
&config, NULL, NULL, &error);
765
/* Free the configuration data */
1237
mc.server = avahi_server_new(avahi_simple_poll_get
1238
(mc.simple_poll), &config, NULL,
1241
/* Free the Avahi configuration data */
766
1242
avahi_server_config_free(&config);
768
/* Check if creating the server object succeeded */
770
fprintf(stderr, "Failed to create server: %s\n",
771
avahi_strerror(error));
772
returncode = EXIT_FAILURE;
776
/* Create the service browser */
777
sb = avahi_s_service_browser_new(server, if_index,
779
"_mandos._tcp", NULL, 0,
780
browse_callback, server);
782
fprintf(stderr, "Failed to create service browser: %s\n",
783
avahi_strerror(avahi_server_errno(server)));
784
returncode = EXIT_FAILURE;
788
/* Run the main loop */
791
fprintf(stderr, "Starting avahi loop search\n");
794
avahi_simple_poll_loop(simple_poll);
799
fprintf(stderr, "%s exiting\n", argv[0]);
804
avahi_s_service_browser_free(sb);
807
avahi_server_free(server);
810
avahi_simple_poll_free(simple_poll);
1245
/* Check if creating the Avahi server object succeeded */
1246
if(mc.server == NULL){
1247
fprintf(stderr, "Failed to create Avahi server: %s\n",
1248
avahi_strerror(error));
1249
exitcode = EXIT_FAILURE;
1253
/* Create the Avahi service browser */
1254
sb = avahi_s_service_browser_new(mc.server, if_index,
1255
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1256
NULL, 0, browse_callback, NULL);
1258
fprintf(stderr, "Failed to create service browser: %s\n",
1259
avahi_strerror(avahi_server_errno(mc.server)));
1260
exitcode = EXIT_FAILURE;
1264
/* Run the main loop */
1267
fprintf(stderr, "Starting Avahi loop search\n");
1270
avahi_simple_poll_loop(mc.simple_poll);
1275
fprintf(stderr, "%s exiting\n", argv[0]);
1278
/* Cleanup things */
1280
avahi_s_service_browser_free(sb);
1282
if(mc.server != NULL)
1283
avahi_server_free(mc.server);
1285
if(mc.simple_poll != NULL)
1286
avahi_simple_poll_free(mc.simple_poll);
1288
if(gnutls_initialized){
1289
gnutls_certificate_free_credentials(mc.cred);
1290
gnutls_global_deinit();
1291
gnutls_dh_params_deinit(mc.dh_params);
1294
if(gpgme_initialized){
1295
gpgme_release(mc.ctx);
1298
/* Removes the temp directory used by GPGME */
1299
if(tempdir_created){
1301
struct dirent *direntry;
1302
d = opendir(tempdir);
1304
if(errno != ENOENT){
1309
direntry = readdir(d);
1310
if(direntry == NULL){
1313
/* Skip "." and ".." */
1314
if(direntry->d_name[0] == '.'
1315
and (direntry->d_name[1] == '\0'
1316
or (direntry->d_name[1] == '.'
1317
and direntry->d_name[2] == '\0'))){
1320
char *fullname = NULL;
1321
ret = asprintf(&fullname, "%s/%s", tempdir,
1327
ret = remove(fullname);
1329
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1336
ret = rmdir(tempdir);
1337
if(ret == -1 and errno != ENOENT){