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*/
140
* Make additional room in "buffer" for at least BUFFER_SIZE more
141
* bytes. "buffer_capacity" is how much is currently allocated,
142
* "buffer_length" is how much is already used.
144
size_t incbuffer(char **buffer, size_t buffer_length,
145
size_t buffer_capacity){
146
if(buffer_length + BUFFER_SIZE > buffer_capacity){
147
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
151
buffer_capacity += BUFFER_SIZE;
153
return buffer_capacity;
159
static bool init_gpgme(const char *seckey,
160
const char *pubkey, const char *tempdir){
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
163
97
gpgme_engine_info_t engine_info;
167
* Helper function to insert pub and seckey to the engine keyring.
169
bool import_key(const char *filename){
171
gpgme_data_t pgp_data;
173
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
179
rc = gpgme_data_new_from_fd(&pgp_data, fd);
180
if(rc != GPG_ERR_NO_ERROR){
181
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
182
gpgme_strsource(rc), gpgme_strerror(rc));
186
rc = gpgme_op_import(mc.ctx, pgp_data);
187
if(rc != GPG_ERR_NO_ERROR){
188
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
189
gpgme_strsource(rc), gpgme_strerror(rc));
193
ret = (int)TEMP_FAILURE_RETRY(close(fd));
197
gpgme_data_release(pgp_data);
202
fprintf(stderr, "Initializing GPGME\n");
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
206
104
gpgme_check_version(NULL);
207
105
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
208
if(rc != GPG_ERR_NO_ERROR){
106
if (rc != GPG_ERR_NO_ERROR){
209
107
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
210
108
gpgme_strsource(rc), gpgme_strerror(rc));
214
/* Set GPGME home directory for the OpenPGP engine only */
215
rc = gpgme_get_engine_info(&engine_info);
216
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){
217
115
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
218
116
gpgme_strsource(rc), gpgme_strerror(rc));
221
119
while(engine_info != NULL){
222
120
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
223
121
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
224
engine_info->file_name, tempdir);
122
engine_info->file_name, homedir);
227
125
engine_info = engine_info->next;
229
127
if(engine_info == NULL){
230
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
234
/* Create new GPGME "context" */
235
rc = gpgme_new(&(mc.ctx));
236
if(rc != GPG_ERR_NO_ERROR){
237
fprintf(stderr, "bad gpgme_new: %s: %s\n",
238
gpgme_strsource(rc), gpgme_strerror(rc));
242
if(not import_key(pubkey) or not import_key(seckey)){
250
* Decrypt OpenPGP data.
251
* Returns -1 on error
253
static ssize_t pgp_packet_decrypt(const char *cryptotext,
256
gpgme_data_t dh_crypto, dh_plain;
259
size_t plaintext_capacity = 0;
260
ssize_t plaintext_length = 0;
263
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
266
/* Create new GPGME data buffer from memory cryptotext */
267
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
269
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){
270
135
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
271
136
gpgme_strsource(rc), gpgme_strerror(rc));
275
140
/* Create new empty GPGME data buffer for the plaintext */
276
141
rc = gpgme_data_new(&dh_plain);
277
if(rc != GPG_ERR_NO_ERROR){
142
if (rc != GPG_ERR_NO_ERROR){
278
143
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
279
144
gpgme_strsource(rc), gpgme_strerror(rc));
280
gpgme_data_release(dh_crypto);
284
/* Decrypt data from the cryptotext data buffer to the plaintext
286
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
287
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){
288
160
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
289
161
gpgme_strsource(rc), gpgme_strerror(rc));
290
plaintext_length = -1;
292
gpgme_decrypt_result_t result;
293
result = gpgme_op_decrypt_result(mc.ctx);
295
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
297
fprintf(stderr, "Unsupported algorithm: %s\n",
298
result->unsupported_algorithm);
299
fprintf(stderr, "Wrong key usage: %u\n",
300
result->wrong_key_usage);
301
if(result->file_name != NULL){
302
fprintf(stderr, "File name: %s\n", result->file_name);
304
gpgme_recipient_t recipient;
305
recipient = result->recipients;
307
while(recipient != NULL){
308
fprintf(stderr, "Public key algorithm: %s\n",
309
gpgme_pubkey_algo_name(recipient->pubkey_algo));
310
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
311
fprintf(stderr, "Secret key available: %s\n",
312
recipient->status == GPG_ERR_NO_SECKEY
314
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;
323
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
326
201
/* Seek back to the beginning of the GPGME plaintext data buffer */
327
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
328
perror("gpgme_data_seek");
329
plaintext_length = -1;
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
perror("pgpme_data_seek");
335
plaintext_capacity = incbuffer(plaintext,
336
(size_t)plaintext_length,
338
if(plaintext_capacity == 0){
340
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;
344
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
346
221
/* Print the data, if any */
352
226
perror("gpgme_data_read");
353
plaintext_length = -1;
356
plaintext_length += ret;
360
fprintf(stderr, "Decrypted password is: ");
361
for(ssize_t i = 0; i < plaintext_length; i++){
362
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
364
fprintf(stderr, "\n");
369
/* Delete the GPGME cryptotext data buffer */
370
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"); */
372
240
/* Delete the GPGME plaintext data buffer */
373
241
gpgme_data_release(dh_plain);
374
return plaintext_length;
242
return new_packet_length;
377
static const char * safer_gnutls_strerror(int value){
378
const char *ret = gnutls_strerror(value); /* Spurious warning from
379
-Wunreachable-code */
245
static const char * safer_gnutls_strerror (int value) {
246
const char *ret = gnutls_strerror (value);
381
248
ret = "(unknown)";
385
/* GnuTLS log function callback */
386
252
static void debuggnutls(__attribute__((unused)) int level,
387
253
const char* string){
388
fprintf(stderr, "GnuTLS: %s", string);
254
fprintf(stderr, "%s", string);
391
static int init_gnutls_global(const char *pubkeyfilename,
392
const char *seckeyfilename){
257
static int initgnutls(mandos_context *mc){
396
262
fprintf(stderr, "Initializing GnuTLS\n");
399
ret = gnutls_global_init();
400
if(ret != GNUTLS_E_SUCCESS){
401
fprintf(stderr, "GnuTLS global_init: %s\n",
402
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));
407
/* "Use a log level over 10 to enable all debugging options."
410
272
gnutls_global_set_log_level(11);
411
273
gnutls_global_set_log_function(debuggnutls);
414
/* OpenPGP credentials */
415
gnutls_certificate_allocate_credentials(&mc.cred);
416
if(ret != GNUTLS_E_SUCCESS){
417
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
421
safer_gnutls_strerror(ret));
422
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));
427
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
428
" 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,
432
290
ret = gnutls_certificate_set_openpgp_key_file
433
(mc.cred, pubkeyfilename, seckeyfilename,
434
GNUTLS_OPENPGP_FMT_BASE64);
435
if(ret != GNUTLS_E_SUCCESS){
437
"Error[%d] while reading the OpenPGP key pair ('%s',"
438
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
439
fprintf(stderr, "The GnuTLS error is: %s\n",
440
safer_gnutls_strerror(ret));
444
/* GnuTLS server initialization */
445
ret = gnutls_dh_params_init(&mc.dh_params);
446
if(ret != GNUTLS_E_SUCCESS){
447
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
448
" %s\n", safer_gnutls_strerror(ret));
451
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
452
if(ret != GNUTLS_E_SUCCESS){
453
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
454
safer_gnutls_strerror(ret));
458
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
464
gnutls_certificate_free_credentials(mc.cred);
465
gnutls_global_deinit();
466
gnutls_dh_params_deinit(mc.dh_params);
470
static int init_gnutls_session(gnutls_session_t *session){
472
/* GnuTLS session creation */
473
ret = gnutls_init(session, GNUTLS_SERVER);
474
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){
475
322
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
476
323
safer_gnutls_strerror(ret));
481
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
482
if(ret != GNUTLS_E_SUCCESS){
483
fprintf(stderr, "Syntax error at: %s\n", err);
484
fprintf(stderr, "GnuTLS error: %s\n",
485
safer_gnutls_strerror(ret));
486
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));
491
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
493
if(ret != GNUTLS_E_SUCCESS){
494
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",
495
338
safer_gnutls_strerror(ret));
496
gnutls_deinit(*session);
500
342
/* ignore client certificate if any. */
501
gnutls_certificate_server_set_request(*session,
343
gnutls_certificate_server_set_request (es->session,
504
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
346
gnutls_dh_set_prime_bits (es->session, DH_BITS);
509
/* Avahi log function callback */
510
351
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
511
352
__attribute__((unused)) const char *txt){}
513
/* Called when a Mandos server is found */
514
354
static int start_mandos_communication(const char *ip, uint16_t port,
515
355
AvahiIfIndex if_index,
520
struct sockaddr_in in;
521
struct sockaddr_in6 in6;
358
struct sockaddr_in6 to;
359
encrypted_session es;
523
360
char *buffer = NULL;
524
361
char *decrypted_buffer;
525
362
size_t buffer_length = 0;
526
363
size_t buffer_capacity = 0;
527
364
ssize_t decrypted_buffer_size;
530
gnutls_session_t session;
531
int pf; /* Protocol family */
541
fprintf(stderr, "Bad address family: %d\n", af);
545
ret = init_gnutls_session(&session);
367
char interface[IF_NAMESIZE];
551
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
370
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
555
tcp_sd = socket(pf, SOCK_STREAM, 0);
374
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
557
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);
561
memset(&to, 0, sizeof(to));
563
to.in6.sin6_family = (uint16_t)af;
564
ret = inet_pton(af, ip, &to.in6.sin6_addr);
566
to.in.sin_family = (sa_family_t)af;
567
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);
570
395
perror("inet_pton");
574
399
fprintf(stderr, "Bad address: %s\n", ip);
578
to.in6.sin6_port = htons(port); /* Spurious warnings from
580
-Wunreachable-code */
582
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
583
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
585
if(if_index == AVAHI_IF_UNSPEC){
586
fprintf(stderr, "An IPv6 link-local address is incomplete"
587
" without a network interface\n");
590
/* Set the network interface number as scope */
591
to.in6.sin6_scope_id = (uint32_t)if_index;
594
to.in.sin_port = htons(port); /* Spurious warnings from
596
-Wunreachable-code */
402
to.sin6_port = htons(port); /* Spurious warning */
404
to.sin6_scope_id = (uint32_t)if_index;
600
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
601
char interface[IF_NAMESIZE];
602
if(if_indextoname((unsigned int)if_index, interface) == NULL){
603
perror("if_indextoname");
605
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
606
ip, interface, port);
609
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
612
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
613
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
616
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
619
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
625
if(strcmp(addrstr, ip) != 0){
626
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)); */
632
ret = connect(tcp_sd, &to.in6, sizeof(to));
634
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
637
420
perror("connect");
641
const char *out = mandos_protocol_version;
644
size_t out_size = strlen(out);
645
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
646
out_size - written));
652
written += (size_t)ret;
653
if(written < out_size){
656
if(out == mandos_protocol_version){
424
ret = initgnutls (&es);
430
gnutls_transport_set_ptr (es.session,
431
(gnutls_transport_ptr_t) tcp_sd);
666
434
fprintf(stderr, "Establishing TLS session with %s\n", ip);
669
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
672
ret = gnutls_handshake(session);
673
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
675
if(ret != GNUTLS_E_SUCCESS){
437
ret = gnutls_handshake (es.session);
439
if (ret != GNUTLS_E_SUCCESS){
677
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
441
fprintf(stderr, "\n*** Handshake failed ***\n");
684
/* Read OpenPGP packet that contains the wanted password */
448
//Retrieve OpenPGP packet that contains the wanted password
687
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
451
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
692
buffer_capacity = incbuffer(&buffer, buffer_length,
694
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;
700
sret = gnutls_record_recv(session, buffer+buffer_length,
465
ret = gnutls_record_recv
466
(es.session, buffer+buffer_length, BUFFER_SIZE);
707
472
case GNUTLS_E_INTERRUPTED:
708
473
case GNUTLS_E_AGAIN:
710
475
case GNUTLS_E_REHANDSHAKE:
712
ret = gnutls_handshake(session);
713
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
715
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
476
ret = gnutls_handshake (es.session);
478
fprintf(stderr, "\n*** Handshake failed ***\n");
722
485
fprintf(stderr, "Unknown error while reading data from"
723
" encrypted session with Mandos server\n");
486
" encrypted session with mandos server\n");
725
gnutls_bye(session, GNUTLS_SHUT_RDWR);
488
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
729
buffer_length += (size_t) sret;
492
buffer_length += (size_t) ret;
734
fprintf(stderr, "Closing TLS session\n");
737
gnutls_bye(session, GNUTLS_SHUT_RDWR);
739
if(buffer_length > 0){
496
if (buffer_length > 0){
740
497
decrypted_buffer_size = pgp_packet_decrypt(buffer,
743
if(decrypted_buffer_size >= 0){
501
if (decrypted_buffer_size >= 0){
745
502
while(written < (size_t) decrypted_buffer_size){
746
ret = (int)fwrite(decrypted_buffer + written, 1,
747
(size_t)decrypted_buffer_size - written,
503
ret = (int)fwrite (decrypted_buffer + written, 1,
504
(size_t)decrypted_buffer_size - written,
749
506
if(ret == 0 and ferror(stdout)){
751
508
fprintf(stderr, "Error writing encrypted data: %s\n",
808
567
char ip[AVAHI_ADDRESS_STR_MAX];
809
568
avahi_address_snprint(ip, sizeof(ip), address);
811
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
812
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
813
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);
815
int ret = start_mandos_communication(ip, port, interface,
816
avahi_proto_to_af(proto));
818
avahi_simple_poll_quit(mc.simple_poll);
573
int ret = start_mandos_communication(ip, port, interface, mc);
822
579
avahi_s_service_resolver_free(r);
825
static void browse_callback(AvahiSServiceBrowser *b,
826
AvahiIfIndex interface,
827
AvahiProtocol protocol,
828
AvahiBrowserEvent event,
832
AVAHI_GCC_UNUSED AvahiLookupResultFlags
834
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 */
837
594
/* Called whenever a new services becomes available on the LAN or
838
595
is removed from the LAN */
842
599
case AVAHI_BROWSER_FAILURE:
844
fprintf(stderr, "(Avahi browser) %s\n",
845
avahi_strerror(avahi_server_errno(mc.server)));
846
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);
849
606
case AVAHI_BROWSER_NEW:
850
/* We ignore the returned Avahi resolver object. In the callback
851
function we free it. If the Avahi server is terminated before
852
the callback function is called the Avahi server will free the
855
if(!(avahi_s_service_resolver_new(mc.server, interface,
856
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,
857
614
AVAHI_PROTO_INET6, 0,
858
resolve_callback, NULL)))
859
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
860
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)));
863
620
case AVAHI_BROWSER_REMOVE:
866
623
case AVAHI_BROWSER_ALL_FOR_NOW:
867
624
case AVAHI_BROWSER_CACHE_EXHAUSTED:
869
fprintf(stderr, "No Mandos server found, still searching...\n");
875
sig_atomic_t quit_now = 0;
877
static void handle_sigterm(__attribute__((unused)) int sig){
882
int old_errno = errno;
883
if(mc.simple_poll != NULL){
884
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';
889
int main(int argc, char *argv[]){
890
AvahiSServiceBrowser *sb = NULL;
895
int exitcode = EXIT_SUCCESS;
896
const char *interface = "eth0";
897
struct ifreq network;
901
char *connect_to = NULL;
902
char tempdir[] = "/tmp/mandosXXXXXX";
903
bool tempdir_created = false;
904
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
905
const char *seckey = PATHDIR "/" SECKEY;
906
const char *pubkey = PATHDIR "/" PUBKEY;
908
/* Initialize Mandos context */
909
mc = (mandos_context){ .simple_poll = NULL, .server = NULL,
910
.dh_bits = 1024, .priority = "SECURE256"
911
":!CTYPE-X.509:+CTYPE-OPENPGP" };
912
bool gnutls_initialized = false;
913
bool gpgme_initialized = false;
916
struct sigaction old_sigterm_action;
917
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
920
struct argp_option options[] = {
921
{ .name = "debug", .key = 128,
922
.doc = "Debug mode", .group = 3 },
923
{ .name = "connect", .key = 'c',
924
.arg = "ADDRESS:PORT",
925
.doc = "Connect directly to a specific Mandos server",
927
{ .name = "interface", .key = 'i',
929
.doc = "Network interface that will be used to search for"
932
{ .name = "seckey", .key = 's',
934
.doc = "OpenPGP secret key file base name",
936
{ .name = "pubkey", .key = 'p',
938
.doc = "OpenPGP public key file base name",
940
{ .name = "dh-bits", .key = 129,
942
.doc = "Bit length of the prime number used in the"
943
" Diffie-Hellman key exchange",
945
{ .name = "priority", .key = 130,
947
.doc = "GnuTLS priority string for the TLS handshake",
949
{ .name = "delay", .key = 131,
951
.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"};
956
error_t parse_opt(int key, char *arg,
957
struct argp_state *state){
959
case 128: /* --debug */
962
case 'c': /* --connect */
965
case 'i': /* --interface */
968
case 's': /* --seckey */
971
case 'p': /* --pubkey */
974
case 129: /* --dh-bits */
975
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
976
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
977
or arg[numchars] != '\0'){
978
fprintf(stderr, "Bad number of DH bits\n");
981
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
983
case 130: /* --priority */
986
case 131: /* --delay */
987
ret = sscanf(arg, "%lf%n", &delay, &numchars);
988
if(ret < 1 or arg[numchars] != '\0'){
989
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;
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;
1015
/* If the interface is down, bring it up */
1016
if(interface[0] != '\0'){
1018
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1019
messages to mess up the prompt */
1020
ret = klogctl(8, NULL, 5);
1021
bool restore_loglevel = true;
1023
restore_loglevel = false;
1026
#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);
1028
766
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1030
768
perror("socket");
1031
exitcode = EXIT_FAILURE;
1033
if(restore_loglevel){
1034
ret = klogctl(7, NULL, 0);
1039
#endif /* __linux__ */
769
returncode = EXIT_FAILURE;
1042
strcpy(network.ifr_name, interface);
772
strcpy(network.ifr_name, interface);
1043
773
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1045
776
perror("ioctl SIOCGIFFLAGS");
1047
if(restore_loglevel){
1048
ret = klogctl(7, NULL, 0);
1053
#endif /* __linux__ */
1054
exitcode = EXIT_FAILURE;
777
returncode = EXIT_FAILURE;
1057
780
if((network.ifr_flags & IFF_UP) == 0){
1058
781
network.ifr_flags |= IFF_UP;
1059
782
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1061
784
perror("ioctl SIOCSIFFLAGS");
1062
exitcode = EXIT_FAILURE;
1064
if(restore_loglevel){
1065
ret = klogctl(7, NULL, 0);
1070
#endif /* __linux__ */
1074
/* sleep checking until interface is running */
1075
for(int i=0; i < delay * 4; i++){
1076
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1078
perror("ioctl SIOCGIFFLAGS");
1079
} else if(network.ifr_flags & IFF_RUNNING){
1082
struct timespec sleeptime = { .tv_nsec = 250000000 };
1083
ret = nanosleep(&sleeptime, NULL);
1084
if(ret == -1 and errno != EINTR){
1085
perror("nanosleep");
1088
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1093
if(restore_loglevel){
1094
/* Restores kernel loglevel to default */
1095
ret = klogctl(7, NULL, 0);
1100
#endif /* __linux__ */
1117
ret = init_gnutls_global(pubkey, seckey);
1119
fprintf(stderr, "init_gnutls_global failed\n");
1120
exitcode = EXIT_FAILURE;
1123
gnutls_initialized = true;
1126
if(mkdtemp(tempdir) == NULL){
1130
tempdir_created = true;
1132
if(not init_gpgme(pubkey, seckey, tempdir)){
1133
fprintf(stderr, "init_gpgme failed\n");
1134
exitcode = EXIT_FAILURE;
1137
gpgme_initialized = true;
1140
if(interface[0] != '\0'){
1141
if_index = (AvahiIfIndex) if_nametoindex(interface);
1143
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1144
exitcode = EXIT_FAILURE;
1149
if(connect_to != NULL){
1150
/* Connect directly, do not use Zeroconf */
1151
/* (Mainly meant for debugging) */
1152
char *address = strrchr(connect_to, ':');
1153
if(address == NULL){
1154
fprintf(stderr, "No colon in address\n");
1155
exitcode = EXIT_FAILURE;
1159
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1160
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1161
or address[numchars+1] != '\0'){
1162
fprintf(stderr, "Bad port number\n");
1163
exitcode = EXIT_FAILURE;
1166
port = (uint16_t)tmpmax;
1168
address = connect_to;
1169
/* Colon in address indicates IPv6 */
1171
if(strchr(address, ':') != NULL){
1176
ret = start_mandos_communication(address, port, if_index, af);
1178
exitcode = EXIT_FAILURE;
1180
exitcode = EXIT_SUCCESS;
1186
avahi_set_log_function(empty_log);
1189
/* Initialize the pseudo-RNG for Avahi */
1190
srand((unsigned int) time(NULL));
1192
/* Allocate main Avahi loop object */
1193
mc.simple_poll = avahi_simple_poll_new();
1194
if(mc.simple_poll == NULL){
1195
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1196
exitcode = EXIT_FAILURE;
1201
AvahiServerConfig config;
1202
/* 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 */
1203
806
avahi_server_config_init(&config);
1204
807
config.publish_hinfo = 0;
1205
808
config.publish_addresses = 0;
1206
809
config.publish_workstation = 0;
1207
810
config.publish_domain = 0;
1209
812
/* Allocate a new server */
1210
mc.server = avahi_server_new(avahi_simple_poll_get
1211
(mc.simple_poll), &config, NULL,
1214
/* 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 */
1215
817
avahi_server_config_free(&config);
1218
/* Check if creating the Avahi server object succeeded */
1219
if(mc.server == NULL){
1220
fprintf(stderr, "Failed to create Avahi server: %s\n",
1221
avahi_strerror(error));
1222
exitcode = EXIT_FAILURE;
1226
/* Create the Avahi service browser */
1227
sb = avahi_s_service_browser_new(mc.server, if_index,
1228
AVAHI_PROTO_INET6, "_mandos._tcp",
1229
NULL, 0, browse_callback, NULL);
1231
fprintf(stderr, "Failed to create service browser: %s\n",
1232
avahi_strerror(avahi_server_errno(mc.server)));
1233
exitcode = EXIT_FAILURE;
1237
sigemptyset(&sigterm_action.sa_mask);
1238
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1240
perror("sigaddset");
1241
exitcode = EXIT_FAILURE;
1244
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1246
perror("sigaddset");
1247
exitcode = EXIT_FAILURE;
1250
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1252
perror("sigaddset");
1253
exitcode = EXIT_FAILURE;
1256
ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);
1258
perror("sigaction");
1259
exitcode = EXIT_FAILURE;
1263
/* Run the main loop */
1266
fprintf(stderr, "Starting Avahi loop search\n");
1269
avahi_simple_poll_loop(mc.simple_poll);
1274
fprintf(stderr, "%s exiting\n", argv[0]);
1277
/* Cleanup things */
1279
avahi_s_service_browser_free(sb);
1281
if(mc.server != NULL)
1282
avahi_server_free(mc.server);
1284
if(mc.simple_poll != NULL)
1285
avahi_simple_poll_free(mc.simple_poll);
1287
if(gnutls_initialized){
1288
gnutls_certificate_free_credentials(mc.cred);
1289
gnutls_global_deinit();
1290
gnutls_dh_params_deinit(mc.dh_params);
1293
if(gpgme_initialized){
1294
gpgme_release(mc.ctx);
1297
/* Removes the temp directory used by GPGME */
1298
if(tempdir_created){
1300
struct dirent *direntry;
1301
d = opendir(tempdir);
1303
if(errno != ENOENT){
1308
direntry = readdir(d);
1309
if(direntry == NULL){
1312
/* Skip "." and ".." */
1313
if(direntry->d_name[0] == '.'
1314
and (direntry->d_name[1] == '\0'
1315
or (direntry->d_name[1] == '.'
1316
and direntry->d_name[2] == '\0'))){
1319
char *fullname = NULL;
1320
ret = asprintf(&fullname, "%s/%s", tempdir,
1326
ret = remove(fullname);
1328
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1335
ret = rmdir(tempdir);
1336
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);