94
47
#include <avahi-common/malloc.h>
95
48
#include <avahi-common/error.h>
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,
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
65
#include <errno.h> /* perror() */
114
71
#define BUFFER_SIZE 256
116
#define PATHDIR "/conf/conf.d/mandos"
117
#define SECKEY "seckey.txt"
118
#define PUBKEY "pubkey.txt"
74
static const char *certdir = "/conf/conf.d/mandos";
75
static const char *certfile = "openpgp-client.txt";
76
static const char *certkey = "openpgp-client-key.txt";
120
78
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 */
127
81
AvahiSimplePoll *simple_poll;
128
82
AvahiServer *server;
129
83
gnutls_certificate_credentials_t cred;
130
84
unsigned int dh_bits;
131
gnutls_dh_params_t dh_params;
132
85
const char *priority;
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
91
gpgme_data_t dh_crypto, dh_plain;
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){
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
165
97
gpgme_engine_info_t engine_info;
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
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
208
104
gpgme_check_version(NULL);
209
105
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
210
if(rc != GPG_ERR_NO_ERROR){
106
if (rc != GPG_ERR_NO_ERROR){
211
107
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
212
108
gpgme_strsource(rc), gpgme_strerror(rc));
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){
112
/* Set GPGME home directory */
113
rc = gpgme_get_engine_info (&engine_info);
114
if (rc != GPG_ERR_NO_ERROR){
219
115
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
220
116
gpgme_strsource(rc), gpgme_strerror(rc));
223
119
while(engine_info != NULL){
224
120
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
225
121
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
226
engine_info->file_name, tempdir);
122
engine_info->file_name, homedir);
229
125
engine_info = engine_info->next;
231
127
if(engine_info == NULL){
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){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
134
if (rc != GPG_ERR_NO_ERROR){
272
135
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
273
136
gpgme_strsource(rc), gpgme_strerror(rc));
277
140
/* Create new empty GPGME data buffer for the plaintext */
278
141
rc = gpgme_data_new(&dh_plain);
279
if(rc != GPG_ERR_NO_ERROR){
142
if (rc != GPG_ERR_NO_ERROR){
280
143
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
281
144
gpgme_strsource(rc), gpgme_strerror(rc));
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){
148
/* Create new GPGME "context" */
149
rc = gpgme_new(&ctx);
150
if (rc != GPG_ERR_NO_ERROR){
151
fprintf(stderr, "bad gpgme_new: %s: %s\n",
152
gpgme_strsource(rc), gpgme_strerror(rc));
156
/* Decrypt data from the FILE pointer to the plaintext data
158
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
159
if (rc != GPG_ERR_NO_ERROR){
290
160
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
291
161
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;
166
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
170
gpgme_decrypt_result_t result;
171
result = gpgme_op_decrypt_result(ctx);
173
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
175
fprintf(stderr, "Unsupported algorithm: %s\n",
176
result->unsupported_algorithm);
177
fprintf(stderr, "Wrong key usage: %d\n",
178
result->wrong_key_usage);
179
if(result->file_name != NULL){
180
fprintf(stderr, "File name: %s\n", result->file_name);
182
gpgme_recipient_t recipient;
183
recipient = result->recipients;
185
while(recipient != NULL){
186
fprintf(stderr, "Public key algorithm: %s\n",
187
gpgme_pubkey_algo_name(recipient->pubkey_algo));
188
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
189
fprintf(stderr, "Secret key available: %s\n",
190
recipient->status == GPG_ERR_NO_SECKEY
192
recipient = recipient->next;
325
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
328
201
/* Seek back to the beginning of the GPGME plaintext data buffer */
329
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
330
perror("gpgme_data_seek");
331
plaintext_length = -1;
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
perror("pgpme_data_seek");
337
plaintext_capacity = incbuffer(plaintext,
338
(size_t)plaintext_length,
340
if(plaintext_capacity == 0){
342
plaintext_length = -1;
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
212
if (*new_packet == NULL){
216
new_packet_capacity += BUFFER_SIZE;
346
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
348
221
/* Print the data, if any */
354
226
perror("gpgme_data_read");
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);
229
new_packet_length += ret;
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
374
240
/* Delete the GPGME plaintext data buffer */
375
241
gpgme_data_release(dh_plain);
376
return plaintext_length;
242
return new_packet_length;
379
static const char * safer_gnutls_strerror(int value){
380
const char *ret = gnutls_strerror(value); /* Spurious warning from
381
-Wunreachable-code */
245
static const char * safer_gnutls_strerror (int value) {
246
const char *ret = gnutls_strerror (value);
383
248
ret = "(unknown)";
387
/* GnuTLS log function callback */
388
252
static void debuggnutls(__attribute__((unused)) int level,
389
253
const char* string){
390
fprintf(stderr, "GnuTLS: %s", string);
254
fprintf(stderr, "%s", string);
393
static int init_gnutls_global(const char *pubkeyfilename,
394
const char *seckeyfilename){
257
static int initgnutls(mandos_context *mc){
398
262
fprintf(stderr, "Initializing GnuTLS\n");
401
ret = gnutls_global_init();
402
if(ret != GNUTLS_E_SUCCESS){
403
fprintf(stderr, "GnuTLS global_init: %s\n",
404
safer_gnutls_strerror(ret));
265
if ((ret = gnutls_global_init ())
266
!= GNUTLS_E_SUCCESS) {
267
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
409
/* "Use a log level over 10 to enable all debugging options."
412
272
gnutls_global_set_log_level(11);
413
273
gnutls_global_set_log_function(debuggnutls);
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();
276
/* openpgp credentials */
277
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
278
!= GNUTLS_E_SUCCESS) {
279
fprintf (stderr, "memory error: %s\n",
280
safer_gnutls_strerror(ret));
429
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
430
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
285
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
286
" and keyfile %s as GnuTLS credentials\n", certfile,
434
290
ret = gnutls_certificate_set_openpgp_key_file
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){
291
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
292
if (ret != GNUTLS_E_SUCCESS) {
294
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
296
ret, certfile, certkey);
297
fprintf(stdout, "The Error is: %s\n",
298
safer_gnutls_strerror(ret));
302
//GnuTLS server initialization
303
if ((ret = gnutls_dh_params_init (&es->dh_params))
304
!= GNUTLS_E_SUCCESS) {
305
fprintf (stderr, "Error in dh parameter initialization: %s\n",
306
safer_gnutls_strerror(ret));
310
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
311
!= GNUTLS_E_SUCCESS) {
312
fprintf (stderr, "Error in prime generation: %s\n",
313
safer_gnutls_strerror(ret));
317
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
319
// GnuTLS session creation
320
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
321
!= GNUTLS_E_SUCCESS){
477
322
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
478
323
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);
326
if ((ret = gnutls_priority_set_direct (es->session, mc->priority, &err))
327
!= GNUTLS_E_SUCCESS) {
328
fprintf(stderr, "Syntax error at: %s\n", err);
329
fprintf(stderr, "GnuTLS error: %s\n",
330
safer_gnutls_strerror(ret));
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
if ((ret = gnutls_credentials_set
335
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
336
!= GNUTLS_E_SUCCESS) {
337
fprintf(stderr, "Error setting a credentials set: %s\n",
497
338
safer_gnutls_strerror(ret));
498
gnutls_deinit(*session);
502
342
/* ignore client certificate if any. */
503
gnutls_certificate_server_set_request(*session,
343
gnutls_certificate_server_set_request (es->session,
506
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
346
gnutls_dh_set_prime_bits (es->session, DH_BITS);
511
/* Avahi log function callback */
512
351
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
513
352
__attribute__((unused)) const char *txt){}
515
/* Called when a Mandos server is found */
516
354
static int start_mandos_communication(const char *ip, uint16_t port,
517
355
AvahiIfIndex if_index,
522
struct sockaddr_in in;
523
struct sockaddr_in6 in6;
358
struct sockaddr_in6 to;
359
encrypted_session es;
525
360
char *buffer = NULL;
526
361
char *decrypted_buffer;
527
362
size_t buffer_length = 0;
528
363
size_t buffer_capacity = 0;
529
364
ssize_t decrypted_buffer_size;
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);
367
char interface[IF_NAMESIZE];
553
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
370
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
557
tcp_sd = socket(pf, SOCK_STREAM, 0);
374
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
559
376
perror("socket");
381
if(if_indextoname((unsigned int)if_index, interface) == NULL){
383
perror("if_indextoname");
388
fprintf(stderr, "Binding to interface %s\n", interface);
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);
391
memset(&to,0,sizeof(to)); /* Spurious warning */
392
to.sin6_family = AF_INET6;
393
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
572
395
perror("inet_pton");
576
399
fprintf(stderr, "Bad address: %s\n", ip);
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
to.sin6_port = htons(port); /* Spurious warning */
404
to.sin6_scope_id = (uint32_t)if_index;
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);
407
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
408
/* char addrstr[INET6_ADDRSTRLEN]; */
409
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
410
/* sizeof(addrstr)) == NULL){ */
411
/* perror("inet_ntop"); */
413
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
414
/* addrstr, ntohs(to.sin6_port)); */
634
ret = connect(tcp_sd, &to.in6, sizeof(to));
636
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
639
420
perror("connect");
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){
424
ret = initgnutls (&es);
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
668
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
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){
437
ret = gnutls_handshake (es.session);
439
if (ret != GNUTLS_E_SUCCESS){
679
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
441
fprintf(stderr, "\n*** Handshake failed ***\n");
686
/* Read OpenPGP packet that contains the wanted password */
448
//Retrieve OpenPGP packet that contains the wanted password
689
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
694
buffer_capacity = incbuffer(&buffer, buffer_length,
696
if(buffer_capacity == 0){
456
if (buffer_length + BUFFER_SIZE > buffer_capacity){
457
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
462
buffer_capacity += BUFFER_SIZE;
702
sret = gnutls_record_recv(session, buffer+buffer_length,
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
709
472
case GNUTLS_E_INTERRUPTED:
710
473
case GNUTLS_E_AGAIN:
712
475
case GNUTLS_E_REHANDSHAKE:
714
ret = gnutls_handshake(session);
715
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
717
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
476
ret = gnutls_handshake (es.session);
478
fprintf(stderr, "\n*** Handshake failed ***\n");
724
485
fprintf(stderr, "Unknown error while reading data from"
725
" encrypted session with Mandos server\n");
486
" encrypted session with mandos server\n");
727
gnutls_bye(session, GNUTLS_SHUT_RDWR);
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
731
buffer_length += (size_t) sret;
492
buffer_length += (size_t) ret;
736
fprintf(stderr, "Closing TLS session\n");
739
gnutls_bye(session, GNUTLS_SHUT_RDWR);
741
if(buffer_length > 0){
496
if (buffer_length > 0){
742
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
745
if(decrypted_buffer_size >= 0){
501
if (decrypted_buffer_size >= 0){
747
502
while(written < (size_t) decrypted_buffer_size){
748
ret = (int)fwrite(decrypted_buffer + written, 1,
749
(size_t)decrypted_buffer_size - written,
503
ret = (int)fwrite (decrypted_buffer + written, 1,
504
(size_t)decrypted_buffer_size - written,
751
506
if(ret == 0 and ferror(stdout)){
753
508
fprintf(stderr, "Error writing encrypted data: %s\n",
810
567
char ip[AVAHI_ADDRESS_STR_MAX];
811
568
avahi_address_snprint(ip, sizeof(ip), address);
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);
570
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
571
" port %d\n", name, host_name, ip, port);
817
int ret = start_mandos_communication(ip, port, interface,
818
avahi_proto_to_af(proto));
820
avahi_simple_poll_quit(mc.simple_poll);
573
int ret = start_mandos_communication(ip, port, interface, mc);
824
579
avahi_s_service_resolver_free(r);
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){
582
static void browse_callback( AvahiSServiceBrowser *b,
583
AvahiIfIndex interface,
584
AvahiProtocol protocol,
585
AvahiBrowserEvent event,
589
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
591
mandos_context *mc = userdata;
592
assert(b); /* Spurious warning */
839
594
/* Called whenever a new services becomes available on the LAN or
840
595
is removed from the LAN */
844
599
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);
601
fprintf(stderr, "(Browser) %s\n",
602
avahi_strerror(avahi_server_errno(mc->server)));
603
avahi_simple_poll_quit(mc->simple_poll);
851
606
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,
858
protocol, name, type, domain,
607
/* We ignore the returned resolver object. In the callback
608
function we free it. If the server is terminated before
609
the callback function is called the server will free
610
the resolver for us. */
612
if (!(avahi_s_service_resolver_new(mc->server, interface, protocol, name,
859
614
AVAHI_PROTO_INET6, 0,
860
resolve_callback, NULL)))
861
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
862
name, avahi_strerror(avahi_server_errno(mc.server)));
615
resolve_callback, mc)))
616
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
617
avahi_strerror(avahi_server_errno(s)));
865
620
case AVAHI_BROWSER_REMOVE:
868
623
case AVAHI_BROWSER_ALL_FOR_NOW:
869
624
case AVAHI_BROWSER_CACHE_EXHAUSTED:
871
fprintf(stderr, "No Mandos server found, still searching...\n");
877
sig_atomic_t quit_now = 0;
879
/* stop main loop after sigterm has been called */
880
static void handle_sigterm(__attribute__((unused)) int sig){
885
int old_errno = errno;
886
if(mc.simple_poll != NULL){
887
avahi_simple_poll_quit(mc.simple_poll);
629
/* Combines file name and path and returns the malloced new
630
string. some sane checks could/should be added */
631
static const char *combinepath(const char *first, const char *second){
632
size_t f_len = strlen(first);
633
size_t s_len = strlen(second);
634
char *tmp = malloc(f_len + s_len + 2);
639
memcpy(tmp, first, f_len);
643
memcpy(tmp + f_len + 1, second, s_len);
645
tmp[f_len + 1 + s_len] = '\0';
892
int main(int argc, char *argv[]){
893
AvahiSServiceBrowser *sb = NULL;
898
int exitcode = EXIT_SUCCESS;
899
const char *interface = "eth0";
900
struct ifreq network;
904
char *connect_to = NULL;
905
char tempdir[] = "/tmp/mandosXXXXXX";
906
bool tempdir_created = false;
907
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
908
const char *seckey = PATHDIR "/" SECKEY;
909
const char *pubkey = PATHDIR "/" PUBKEY;
911
/* Initialize Mandos context */
912
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
913
.dh_bits = 1024, .priority = "SECURE256"
914
":!CTYPE-X.509:+CTYPE-OPENPGP" };
915
bool gnutls_initialized = false;
916
bool gpgme_initialized = false;
919
struct sigaction old_sigterm_action;
920
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
923
struct argp_option options[] = {
924
{ .name = "debug", .key = 128,
925
.doc = "Debug mode", .group = 3 },
926
{ .name = "connect", .key = 'c',
927
.arg = "ADDRESS:PORT",
928
.doc = "Connect directly to a specific Mandos server",
930
{ .name = "interface", .key = 'i',
932
.doc = "Network interface that will be used to search for"
935
{ .name = "seckey", .key = 's',
937
.doc = "OpenPGP secret key file base name",
939
{ .name = "pubkey", .key = 'p',
941
.doc = "OpenPGP public key file base name",
943
{ .name = "dh-bits", .key = 129,
945
.doc = "Bit length of the prime number used in the"
946
" Diffie-Hellman key exchange",
948
{ .name = "priority", .key = 130,
950
.doc = "GnuTLS priority string for the TLS handshake",
952
{ .name = "delay", .key = 131,
954
.doc = "Maximum delay to wait for interface startup",
650
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
651
AvahiServerConfig config;
652
AvahiSServiceBrowser *sb = NULL;
655
int returncode = EXIT_SUCCESS;
656
const char *interface = "eth0";
657
struct ifreq network;
659
char *connect_to = NULL;
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
662
.dh_bits = 2048, .priority = "SECURE256"};
959
error_t parse_opt(int key, char *arg,
960
struct argp_state *state){
962
case 128: /* --debug */
965
case 'c': /* --connect */
968
case 'i': /* --interface */
971
case 's': /* --seckey */
974
case 'p': /* --pubkey */
977
case 129: /* --dh-bits */
978
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
979
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
980
or arg[numchars] != '\0'){
981
fprintf(stderr, "Bad number of DH bits\n");
984
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
986
case 130: /* --priority */
989
case 131: /* --delay */
990
ret = sscanf(arg, "%lf%n", &delay, &numchars);
991
if(ret < 1 or arg[numchars] != '\0'){
992
fprintf(stderr, "Bad delay\n");
665
static struct option long_options[] = {
666
{"debug", no_argument, (int *)&debug, 1},
667
{"connect", required_argument, 0, 'C'},
668
{"interface", required_argument, 0, 'i'},
669
{"certdir", required_argument, 0, 'd'},
670
{"certkey", required_argument, 0, 'c'},
671
{"certfile", required_argument, 0, 'k'},
672
{"dh_bits", required_argument, 0, 'D'},
673
{"priority", required_argument, 0, 'p'},
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
706
tmp = strtol(optarg, NULL, 10);
707
if (errno == ERANGE){
715
mc.priority = optarg;
1001
return ARGP_ERR_UNKNOWN;
1006
struct argp argp = { .options = options, .parser = parse_opt,
1008
.doc = "Mandos client -- Get and decrypt"
1009
" passwords from a Mandos server" };
1010
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1011
if(ret == ARGP_ERR_UNKNOWN){
1012
fprintf(stderr, "Unknown error while parsing arguments\n");
1013
exitcode = EXIT_FAILURE;
1019
avahi_set_log_function(empty_log);
1022
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1023
from the signal handler */
1024
/* Initialize the pseudo-RNG for Avahi */
1025
srand((unsigned int) time(NULL));
1026
mc.simple_poll = avahi_simple_poll_new();
1027
if(mc.simple_poll == NULL){
1028
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1029
exitcode = EXIT_FAILURE;
1033
sigemptyset(&sigterm_action.sa_mask);
1034
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1036
perror("sigaddset");
1037
exitcode = EXIT_FAILURE;
1040
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1042
perror("sigaddset");
1043
exitcode = EXIT_FAILURE;
1046
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1048
perror("sigaddset");
1049
exitcode = EXIT_FAILURE;
1052
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1054
perror("sigaction");
1055
exitcode = EXIT_FAILURE;
1059
/* If the interface is down, bring it up */
1060
if(interface[0] != '\0'){
1062
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1063
messages to mess up the prompt */
1064
ret = klogctl(8, NULL, 5);
1065
bool restore_loglevel = true;
1067
restore_loglevel = false;
1070
#endif /* __linux__ */
722
certfile = combinepath(certdir, certfile);
723
if (certfile == NULL){
724
perror("combinepath");
725
returncode = EXIT_FAILURE;
729
certkey = combinepath(certdir, certkey);
730
if (certkey == NULL){
731
perror("combinepath");
732
returncode = EXIT_FAILURE;
736
if_index = (AvahiIfIndex) if_nametoindex(interface);
738
fprintf(stderr, "No such interface: \"%s\"\n", interface);
742
if(connect_to != NULL){
743
/* Connect directly, do not use Zeroconf */
744
/* (Mainly meant for debugging) */
745
char *address = strrchr(connect_to, ':');
747
fprintf(stderr, "No colon in address\n");
751
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
753
perror("Bad port number");
757
address = connect_to;
758
ret = start_mandos_communication(address, port, if_index);
1072
766
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1074
768
perror("socket");
1075
exitcode = EXIT_FAILURE;
1077
if(restore_loglevel){
1078
ret = klogctl(7, NULL, 0);
1083
#endif /* __linux__ */
769
returncode = EXIT_FAILURE;
1086
strcpy(network.ifr_name, interface);
772
strcpy(network.ifr_name, interface);
1087
773
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1089
776
perror("ioctl SIOCGIFFLAGS");
1091
if(restore_loglevel){
1092
ret = klogctl(7, NULL, 0);
1097
#endif /* __linux__ */
1098
exitcode = EXIT_FAILURE;
777
returncode = EXIT_FAILURE;
1101
780
if((network.ifr_flags & IFF_UP) == 0){
1102
781
network.ifr_flags |= IFF_UP;
1103
782
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1105
784
perror("ioctl SIOCSIFFLAGS");
1106
exitcode = EXIT_FAILURE;
1108
if(restore_loglevel){
1109
ret = klogctl(7, NULL, 0);
1114
#endif /* __linux__ */
1118
/* sleep checking until interface is running */
1119
for(int i=0; i < delay * 4; i++){
1120
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1122
perror("ioctl SIOCGIFFLAGS");
1123
} else if(network.ifr_flags & IFF_RUNNING){
1126
struct timespec sleeptime = { .tv_nsec = 250000000 };
1127
ret = nanosleep(&sleeptime, NULL);
1128
if(ret == -1 and errno != EINTR){
1129
perror("nanosleep");
1132
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1137
if(restore_loglevel){
1138
/* Restores kernel loglevel to default */
1139
ret = klogctl(7, NULL, 0);
1144
#endif /* __linux__ */
1161
ret = init_gnutls_global(pubkey, seckey);
1163
fprintf(stderr, "init_gnutls_global failed\n");
1164
exitcode = EXIT_FAILURE;
1167
gnutls_initialized = true;
1170
if(mkdtemp(tempdir) == NULL){
1174
tempdir_created = true;
1176
if(not init_gpgme(pubkey, seckey, tempdir)){
1177
fprintf(stderr, "init_gpgme failed\n");
1178
exitcode = EXIT_FAILURE;
1181
gpgme_initialized = true;
1184
if(interface[0] != '\0'){
1185
if_index = (AvahiIfIndex) if_nametoindex(interface);
1187
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1188
exitcode = EXIT_FAILURE;
1193
if(connect_to != NULL){
1194
/* Connect directly, do not use Zeroconf */
1195
/* (Mainly meant for debugging) */
1196
char *address = strrchr(connect_to, ':');
1197
if(address == NULL){
1198
fprintf(stderr, "No colon in address\n");
1199
exitcode = EXIT_FAILURE;
1203
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1204
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1205
or address[numchars+1] != '\0'){
1206
fprintf(stderr, "Bad port number\n");
1207
exitcode = EXIT_FAILURE;
1210
port = (uint16_t)tmpmax;
1212
address = connect_to;
1213
/* Colon in address indicates IPv6 */
1215
if(strchr(address, ':') != NULL){
1220
ret = start_mandos_communication(address, port, if_index, af);
1222
exitcode = EXIT_FAILURE;
1224
exitcode = EXIT_SUCCESS;
1230
AvahiServerConfig config;
1231
/* Do not publish any local Zeroconf records */
785
returncode = EXIT_FAILURE;
792
avahi_set_log_function(empty_log);
795
/* Initialize the psuedo-RNG */
796
srand((unsigned int) time(NULL));
798
/* Allocate main loop object */
799
if (!(mc.simple_poll = avahi_simple_poll_new())) {
800
fprintf(stderr, "Failed to create simple poll object.\n");
801
returncode = EXIT_FAILURE;
805
/* Do not publish any local records */
1232
806
avahi_server_config_init(&config);
1233
807
config.publish_hinfo = 0;
1234
808
config.publish_addresses = 0;
1235
809
config.publish_workstation = 0;
1236
810
config.publish_domain = 0;
1238
812
/* Allocate a new server */
1239
mc.server = avahi_server_new(avahi_simple_poll_get
1240
(mc.simple_poll), &config, NULL,
1243
/* Free the Avahi configuration data */
813
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
814
&config, NULL, NULL, &error);
816
/* Free the configuration data */
1244
817
avahi_server_config_free(&config);
1247
/* Check if creating the Avahi server object succeeded */
1248
if(mc.server == NULL){
1249
fprintf(stderr, "Failed to create Avahi server: %s\n",
1250
avahi_strerror(error));
1251
exitcode = EXIT_FAILURE;
1255
/* Create the Avahi service browser */
1256
sb = avahi_s_service_browser_new(mc.server, if_index,
1257
AVAHI_PROTO_INET6, "_mandos._tcp",
1258
NULL, 0, browse_callback, NULL);
1260
fprintf(stderr, "Failed to create service browser: %s\n",
1261
avahi_strerror(avahi_server_errno(mc.server)));
1262
exitcode = EXIT_FAILURE;
1266
/* Run the main loop */
1269
fprintf(stderr, "Starting Avahi loop search\n");
1272
avahi_simple_poll_loop(mc.simple_poll);
1277
fprintf(stderr, "%s exiting\n", argv[0]);
1280
/* Cleanup things */
1282
avahi_s_service_browser_free(sb);
1284
if(mc.server != NULL)
1285
avahi_server_free(mc.server);
1287
if(mc.simple_poll != NULL)
1288
avahi_simple_poll_free(mc.simple_poll);
1290
if(gnutls_initialized){
1291
gnutls_certificate_free_credentials(mc.cred);
1292
gnutls_global_deinit();
1293
gnutls_dh_params_deinit(mc.dh_params);
1296
if(gpgme_initialized){
1297
gpgme_release(mc.ctx);
1300
/* Removes the temp directory used by GPGME */
1301
if(tempdir_created){
1303
struct dirent *direntry;
1304
d = opendir(tempdir);
1306
if(errno != ENOENT){
1311
direntry = readdir(d);
1312
if(direntry == NULL){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1322
char *fullname = NULL;
1323
ret = asprintf(&fullname, "%s/%s", tempdir,
1329
ret = remove(fullname);
1331
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1338
ret = rmdir(tempdir);
1339
if(ret == -1 and errno != ENOENT){
819
/* Check if creating the server object succeeded */
821
fprintf(stderr, "Failed to create server: %s\n",
822
avahi_strerror(error));
823
returncode = EXIT_FAILURE;
827
/* Create the service browser */
828
sb = avahi_s_service_browser_new(mc.server, if_index,
830
"_mandos._tcp", NULL, 0,
831
browse_callback, &mc);
833
fprintf(stderr, "Failed to create service browser: %s\n",
834
avahi_strerror(avahi_server_errno(mc.server)));
835
returncode = EXIT_FAILURE;
839
/* Run the main loop */
842
fprintf(stderr, "Starting avahi loop search\n");
845
avahi_simple_poll_loop(simple_poll);
850
fprintf(stderr, "%s exiting\n", argv[0]);
855
avahi_s_service_browser_free(sb);
858
avahi_server_free(mc.server);
861
avahi_simple_poll_free(simple_poll);