31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open() */
57
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno */
66
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
71
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), setuid(),
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sigaction,
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
91
/* All Avahi types, constants and functions
43
94
#include <avahi-core/core.h>
44
95
#include <avahi-core/lookup.h>
45
96
#include <avahi-core/log.h>
47
98
#include <avahi-common/malloc.h>
48
99
#include <avahi-common/error.h>
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() */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
init_gnutls_session(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
112
#include <gpgme.h> /* All GPGME types, constants and
115
GPGME_PROTOCOL_OpenPGP,
71
118
#define BUFFER_SIZE 256
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
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
78
124
bool debug = false;
125
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
129
/* Used for passing in values through the Avahi callback functions */
81
gnutls_session_t session;
131
AvahiSimplePoll *simple_poll;
82
133
gnutls_certificate_credentials_t cred;
134
unsigned int dh_bits;
83
135
gnutls_dh_params_t dh_params;
87
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
90
gpgme_data_t dh_crypto, dh_plain;
136
const char *priority;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
148
* "buffer_length" is how much is already used.
150
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
buffer_capacity += BUFFER_SIZE;
159
return buffer_capacity;
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
94
ssize_t new_packet_capacity = 0;
95
ssize_t new_packet_length = 0;
96
169
gpgme_engine_info_t engine_info;
99
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
173
* Helper function to insert pub and seckey to the engine keyring.
175
bool import_key(const char *filename){
177
gpgme_data_t pgp_data;
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
gpgme_data_release(pgp_data);
208
fprintf(stderr, "Initializing GPGME\n");
103
212
gpgme_check_version(NULL);
104
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
105
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
106
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
107
216
gpgme_strsource(rc), gpgme_strerror(rc));
111
/* Set GPGME home directory */
112
rc = gpgme_get_engine_info (&engine_info);
113
if (rc != GPG_ERR_NO_ERROR){
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
114
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
115
224
gpgme_strsource(rc), gpgme_strerror(rc));
118
227
while(engine_info != NULL){
119
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
120
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
121
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
124
233
engine_info = engine_info->next;
126
235
if(engine_info == NULL){
127
fprintf(stderr, "Could not set home dir to %s\n", homedir);
131
/* Create new GPGME data buffer from packet buffer */
132
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
133
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
248
if(not import_key(pubkey) or not import_key(seckey)){
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
262
gpgme_data_t dh_crypto, dh_plain;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
272
/* Create new GPGME data buffer from memory cryptotext */
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
275
if(rc != GPG_ERR_NO_ERROR){
134
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
135
277
gpgme_strsource(rc), gpgme_strerror(rc));
197
/* Delete the GPGME FILE pointer cryptotext data buffer */
198
gpgme_data_release(dh_crypto);
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
200
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
201
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
202
perror("pgpme_data_seek");
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
333
plaintext_length = -1;
207
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
208
*new_packet = realloc(*new_packet,
209
(unsigned int)new_packet_capacity
211
if (*new_packet == NULL){
215
new_packet_capacity += BUFFER_SIZE;
339
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
342
if(plaintext_capacity == 0){
344
plaintext_length = -1;
218
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
220
350
/* Print the data, if any */
225
356
perror("gpgme_data_read");
228
new_packet_length += ret;
231
/* FIXME: check characters before printing to screen so to not print
232
terminal control characters */
234
/* fprintf(stderr, "decrypted password is: "); */
235
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
236
/* fprintf(stderr, "\n"); */
357
plaintext_length = -1;
360
plaintext_length += ret;
364
fprintf(stderr, "Decrypted password is: ");
365
for(ssize_t i = 0; i < plaintext_length; i++){
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
368
fprintf(stderr, "\n");
373
/* Delete the GPGME cryptotext data buffer */
374
gpgme_data_release(dh_crypto);
239
376
/* Delete the GPGME plaintext data buffer */
240
377
gpgme_data_release(dh_plain);
241
return new_packet_length;
378
return plaintext_length;
244
static const char * safer_gnutls_strerror (int value) {
245
const char *ret = gnutls_strerror (value);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
247
385
ret = "(unknown)";
389
/* GnuTLS log function callback */
251
390
static void debuggnutls(__attribute__((unused)) int level,
252
391
const char* string){
253
fprintf(stderr, "%s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
256
static int initgnutls(encrypted_session *es){
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
261
400
fprintf(stderr, "Initializing GnuTLS\n");
264
if ((ret = gnutls_global_init ())
265
!= GNUTLS_E_SUCCESS) {
266
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
411
/* "Use a log level over 10 to enable all debugging options."
271
414
gnutls_global_set_log_level(11);
272
415
gnutls_global_set_log_function(debuggnutls);
275
/* openpgp credentials */
276
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
277
!= GNUTLS_E_SUCCESS) {
278
fprintf (stderr, "memory error: %s\n",
279
safer_gnutls_strerror(ret));
418
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
284
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
285
" and keyfile %s as GnuTLS credentials\n", certfile,
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
289
436
ret = gnutls_certificate_set_openpgp_key_file
290
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
291
if (ret != GNUTLS_E_SUCCESS) {
293
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
295
ret, certfile, certkey);
296
fprintf(stdout, "The Error is: %s\n",
297
safer_gnutls_strerror(ret));
301
//GnuTLS server initialization
302
if ((ret = gnutls_dh_params_init (&es->dh_params))
303
!= GNUTLS_E_SUCCESS) {
304
fprintf (stderr, "Error in dh parameter initialization: %s\n",
305
safer_gnutls_strerror(ret));
309
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
310
!= GNUTLS_E_SUCCESS) {
311
fprintf (stderr, "Error in prime generation: %s\n",
312
safer_gnutls_strerror(ret));
316
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
318
// GnuTLS session creation
319
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
320
!= GNUTLS_E_SUCCESS){
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
448
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
474
static int init_gnutls_session(gnutls_session_t *session){
476
/* GnuTLS session creation */
477
ret = gnutls_init(session, GNUTLS_SERVER);
478
if(ret != GNUTLS_E_SUCCESS){
321
479
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
322
480
safer_gnutls_strerror(ret));
325
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
326
!= GNUTLS_E_SUCCESS) {
327
fprintf(stderr, "Syntax error at: %s\n", err);
328
fprintf(stderr, "GnuTLS error: %s\n",
329
safer_gnutls_strerror(ret));
485
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
486
if(ret != GNUTLS_E_SUCCESS){
487
fprintf(stderr, "Syntax error at: %s\n", err);
488
fprintf(stderr, "GnuTLS error: %s\n",
489
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
333
if ((ret = gnutls_credentials_set
334
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
335
!= GNUTLS_E_SUCCESS) {
336
fprintf(stderr, "Error setting a credentials set: %s\n",
495
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
497
if(ret != GNUTLS_E_SUCCESS){
498
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
337
499
safer_gnutls_strerror(ret));
500
gnutls_deinit(*session);
341
504
/* ignore client certificate if any. */
342
gnutls_certificate_server_set_request (es->session,
505
gnutls_certificate_server_set_request(*session,
345
gnutls_dh_set_prime_bits (es->session, DH_BITS);
508
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
513
/* Avahi log function callback */
350
514
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
351
515
__attribute__((unused)) const char *txt){}
517
/* Called when a Mandos server is found */
353
518
static int start_mandos_communication(const char *ip, uint16_t port,
354
AvahiIfIndex if_index){
519
AvahiIfIndex if_index,
356
struct sockaddr_in6 to;
357
encrypted_session es;
524
struct sockaddr_in in;
525
struct sockaddr_in6 in6;
358
527
char *buffer = NULL;
359
528
char *decrypted_buffer;
360
529
size_t buffer_length = 0;
361
530
size_t buffer_capacity = 0;
362
531
ssize_t decrypted_buffer_size;
365
char interface[IF_NAMESIZE];
534
gnutls_session_t session;
535
int pf; /* Protocol family */
545
fprintf(stderr, "Bad address family: %d\n", af);
549
ret = init_gnutls_session(&session);
368
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
555
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
372
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
559
tcp_sd = socket(pf, SOCK_STREAM, 0);
374
561
perror("socket");
379
if(if_indextoname((unsigned int)if_index, interface) == NULL){
381
perror("if_indextoname");
386
fprintf(stderr, "Binding to interface %s\n", interface);
389
memset(&to,0,sizeof(to)); /* Spurious warning */
390
to.sin6_family = AF_INET6;
391
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
565
memset(&to, 0, sizeof(to));
567
to.in6.sin6_family = (sa_family_t)af;
568
ret = inet_pton(af, ip, &to.in6.sin6_addr);
570
to.in.sin_family = (sa_family_t)af;
571
ret = inet_pton(af, ip, &to.in.sin_addr);
393
574
perror("inet_pton");
397
578
fprintf(stderr, "Bad address: %s\n", ip);
400
to.sin6_port = htons(port); /* Spurious warning */
402
to.sin6_scope_id = (uint32_t)if_index;
582
to.in6.sin6_port = htons(port); /* Spurious warnings from
584
-Wunreachable-code */
586
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
587
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
589
if(if_index == AVAHI_IF_UNSPEC){
590
fprintf(stderr, "An IPv6 link-local address is incomplete"
591
" without a network interface\n");
594
/* Set the network interface number as scope */
595
to.in6.sin6_scope_id = (uint32_t)if_index;
598
to.in.sin_port = htons(port); /* Spurious warnings from
600
-Wunreachable-code */
405
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
406
/* char addrstr[INET6_ADDRSTRLEN]; */
407
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
408
/* sizeof(addrstr)) == NULL){ */
409
/* perror("inet_ntop"); */
411
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
412
/* addrstr, ntohs(to.sin6_port)); */
604
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
605
char interface[IF_NAMESIZE];
606
if(if_indextoname((unsigned int)if_index, interface) == NULL){
607
perror("if_indextoname");
609
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
610
ip, interface, port);
613
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
616
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
617
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
620
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
623
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
629
if(strcmp(addrstr, ip) != 0){
630
fprintf(stderr, "Canonical address form: %s\n", addrstr);
416
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
636
ret = connect(tcp_sd, &to.in6, sizeof(to));
638
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
418
641
perror("connect");
422
ret = initgnutls (&es);
645
const char *out = mandos_protocol_version;
648
size_t out_size = strlen(out);
649
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
650
out_size - written));
656
written += (size_t)ret;
657
if(written < out_size){
660
if(out == mandos_protocol_version){
428
gnutls_transport_set_ptr (es.session,
429
(gnutls_transport_ptr_t) tcp_sd);
432
670
fprintf(stderr, "Establishing TLS session with %s\n", ip);
435
ret = gnutls_handshake (es.session);
437
if (ret != GNUTLS_E_SUCCESS){
673
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
676
ret = gnutls_handshake(session);
677
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
679
if(ret != GNUTLS_E_SUCCESS){
439
fprintf(stderr, "\n*** Handshake failed ***\n");
681
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
446
//Retrieve OpenPGP packet that contains the wanted password
688
/* Read OpenPGP packet that contains the wanted password */
449
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
691
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
454
if (buffer_length + BUFFER_SIZE > buffer_capacity){
455
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
460
buffer_capacity += BUFFER_SIZE;
696
buffer_capacity = incbuffer(&buffer, buffer_length,
698
if(buffer_capacity == 0){
463
ret = gnutls_record_recv
464
(es.session, buffer+buffer_length, BUFFER_SIZE);
704
sret = gnutls_record_recv(session, buffer+buffer_length,
470
711
case GNUTLS_E_INTERRUPTED:
471
712
case GNUTLS_E_AGAIN:
473
714
case GNUTLS_E_REHANDSHAKE:
474
ret = gnutls_handshake (es.session);
476
fprintf(stderr, "\n*** Handshake failed ***\n");
716
ret = gnutls_handshake(session);
717
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
719
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
483
726
fprintf(stderr, "Unknown error while reading data from"
484
" encrypted session with mandos server\n");
727
" encrypted session with Mandos server\n");
486
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
729
gnutls_bye(session, GNUTLS_SHUT_RDWR);
490
buffer_length += (size_t) ret;
733
buffer_length += (size_t) sret;
494
if (buffer_length > 0){
738
fprintf(stderr, "Closing TLS session\n");
741
gnutls_bye(session, GNUTLS_SHUT_RDWR);
743
if(buffer_length > 0){
495
744
decrypted_buffer_size = pgp_packet_decrypt(buffer,
499
if (decrypted_buffer_size >= 0){
747
if(decrypted_buffer_size >= 0){
500
749
while(written < (size_t) decrypted_buffer_size){
501
ret = (int)fwrite (decrypted_buffer + written, 1,
502
(size_t)decrypted_buffer_size - written,
750
ret = (int)fwrite(decrypted_buffer + written, 1,
751
(size_t)decrypted_buffer_size - written,
504
753
if(ret == 0 and ferror(stdout)){
506
755
fprintf(stderr, "Error writing encrypted data: %s\n",
569
812
char ip[AVAHI_ADDRESS_STR_MAX];
570
813
avahi_address_snprint(ip, sizeof(ip), address);
572
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
573
" port %d\n", name, host_name, ip, port);
815
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
816
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
817
ip, (intmax_t)interface, port);
575
int ret = start_mandos_communication(ip, port, interface);
819
int ret = start_mandos_communication(ip, port, interface,
820
avahi_proto_to_af(proto));
822
avahi_simple_poll_quit(mc.simple_poll);
581
826
avahi_s_service_resolver_free(r);
584
static void browse_callback(
585
AvahiSServiceBrowser *b,
586
AvahiIfIndex interface,
587
AvahiProtocol protocol,
588
AvahiBrowserEvent event,
592
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
595
AvahiServer *s = userdata;
596
assert(b); /* Spurious warning */
598
/* Called whenever a new services becomes available on the LAN or
599
is removed from the LAN */
603
case AVAHI_BROWSER_FAILURE:
605
fprintf(stderr, "(Browser) %s\n",
606
avahi_strerror(avahi_server_errno(server)));
607
avahi_simple_poll_quit(simple_poll);
610
case AVAHI_BROWSER_NEW:
611
/* We ignore the returned resolver object. In the callback
612
function we free it. If the server is terminated before
613
the callback function is called the server will free
614
the resolver for us. */
616
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
618
AVAHI_PROTO_INET6, 0,
619
resolve_callback, s)))
620
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
621
avahi_strerror(avahi_server_errno(s)));
624
case AVAHI_BROWSER_REMOVE:
627
case AVAHI_BROWSER_ALL_FOR_NOW:
628
case AVAHI_BROWSER_CACHE_EXHAUSTED:
829
static void browse_callback(AvahiSServiceBrowser *b,
830
AvahiIfIndex interface,
831
AvahiProtocol protocol,
832
AvahiBrowserEvent event,
836
AVAHI_GCC_UNUSED AvahiLookupResultFlags
838
AVAHI_GCC_UNUSED void* userdata){
841
/* Called whenever a new services becomes available on the LAN or
842
is removed from the LAN */
846
case AVAHI_BROWSER_FAILURE:
848
fprintf(stderr, "(Avahi browser) %s\n",
849
avahi_strerror(avahi_server_errno(mc.server)));
850
avahi_simple_poll_quit(mc.simple_poll);
853
case AVAHI_BROWSER_NEW:
854
/* We ignore the returned Avahi resolver object. In the callback
855
function we free it. If the Avahi server is terminated before
856
the callback function is called the Avahi server will free the
859
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
860
name, type, domain, protocol, 0,
861
resolve_callback, NULL) == NULL)
862
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
863
name, avahi_strerror(avahi_server_errno(mc.server)));
866
case AVAHI_BROWSER_REMOVE:
869
case AVAHI_BROWSER_ALL_FOR_NOW:
870
case AVAHI_BROWSER_CACHE_EXHAUSTED:
872
fprintf(stderr, "No Mandos server found, still searching...\n");
633
/* Combines file name and path and returns the malloced new
634
string. some sane checks could/should be added */
635
static const char *combinepath(const char *first, const char *second){
636
size_t f_len = strlen(first);
637
size_t s_len = strlen(second);
638
char *tmp = malloc(f_len + s_len + 2);
643
memcpy(tmp, first, f_len);
647
memcpy(tmp + f_len + 1, second, s_len);
649
tmp[f_len + 1 + s_len] = '\0';
654
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
655
AvahiServerConfig config;
656
AvahiSServiceBrowser *sb = NULL;
659
int returncode = EXIT_SUCCESS;
660
const char *interface = "eth0";
661
struct ifreq network;
663
char *connect_to = NULL;
664
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
878
sig_atomic_t quit_now = 0;
880
/* stop main loop after sigterm has been called */
881
static void handle_sigterm(__attribute__((unused)) int sig){
886
int old_errno = errno;
887
if(mc.simple_poll != NULL){
888
avahi_simple_poll_quit(mc.simple_poll);
893
int main(int argc, char *argv[]){
894
AvahiSServiceBrowser *sb = NULL;
899
int exitcode = EXIT_SUCCESS;
900
const char *interface = "eth0";
901
struct ifreq network;
903
bool interface_taken_up = false;
906
char *connect_to = NULL;
907
char tempdir[] = "/tmp/mandosXXXXXX";
908
bool tempdir_created = false;
909
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
910
const char *seckey = PATHDIR "/" SECKEY;
911
const char *pubkey = PATHDIR "/" PUBKEY;
913
bool gnutls_initialized = false;
914
bool gpgme_initialized = false;
917
struct sigaction old_sigterm_action;
918
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
921
struct argp_option options[] = {
922
{ .name = "debug", .key = 128,
923
.doc = "Debug mode", .group = 3 },
924
{ .name = "connect", .key = 'c',
925
.arg = "ADDRESS:PORT",
926
.doc = "Connect directly to a specific Mandos server",
928
{ .name = "interface", .key = 'i',
930
.doc = "Network interface that will be used to search for"
933
{ .name = "seckey", .key = 's',
935
.doc = "OpenPGP secret key file base name",
937
{ .name = "pubkey", .key = 'p',
939
.doc = "OpenPGP public key file base name",
941
{ .name = "dh-bits", .key = 129,
943
.doc = "Bit length of the prime number used in the"
944
" Diffie-Hellman key exchange",
946
{ .name = "priority", .key = 130,
948
.doc = "GnuTLS priority string for the TLS handshake",
950
{ .name = "delay", .key = 131,
952
.doc = "Maximum delay to wait for interface startup",
667
static struct option long_options[] = {
668
{"debug", no_argument, (int *)&debug, 1},
669
{"connect", required_argument, 0, 'C'},
670
{"interface", required_argument, 0, 'i'},
671
{"certdir", required_argument, 0, 'd'},
672
{"certkey", required_argument, 0, 'c'},
673
{"certfile", required_argument, 0, 'k'},
676
int option_index = 0;
677
ret = getopt_long (argc, argv, "i:", long_options,
957
error_t parse_opt(int key, char *arg,
958
struct argp_state *state){
960
case 128: /* --debug */
963
case 'c': /* --connect */
966
case 'i': /* --interface */
969
case 's': /* --seckey */
972
case 'p': /* --pubkey */
975
case 129: /* --dh-bits */
977
tmpmax = strtoimax(arg, &tmp, 10);
978
if(errno != 0 or tmp == arg or *tmp != '\0'
979
or tmpmax != (typeof(mc.dh_bits))tmpmax){
980
fprintf(stderr, "Bad number of DH bits\n");
983
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
985
case 130: /* --priority */
988
case 131: /* --delay */
990
delay = strtof(arg, &tmp);
991
if(errno != 0 or tmp == arg or *tmp != '\0'){
992
fprintf(stderr, "Bad delay\n");
707
certfile = combinepath(certdir, certfile);
708
if (certfile == NULL){
709
perror("combinepath");
710
returncode = EXIT_FAILURE;
714
certkey = combinepath(certdir, certkey);
715
if (certkey == NULL){
716
perror("combinepath");
717
returncode = EXIT_FAILURE;
721
if_index = (AvahiIfIndex) if_nametoindex(interface);
723
fprintf(stderr, "No such interface: \"%s\"\n", interface);
727
if(connect_to != NULL){
728
/* Connect directly, do not use Zeroconf */
729
/* (Mainly meant for debugging) */
730
char *address = strrchr(connect_to, ':');
732
fprintf(stderr, "No colon in address\n");
736
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
738
perror("Bad port number");
742
address = connect_to;
743
ret = start_mandos_communication(address, port, if_index);
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__ */
751
1072
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
753
1074
perror("socket");
754
returncode = EXIT_FAILURE;
1075
exitcode = EXIT_FAILURE;
1077
if(restore_loglevel){
1078
ret = klogctl(7, NULL, 0);
1083
#endif /* __linux__ */
757
strcpy(network.ifr_name, interface);
1086
strcpy(network.ifr_name, interface);
758
1087
ret = ioctl(sd, SIOCGIFFLAGS, &network);
761
1089
perror("ioctl SIOCGIFFLAGS");
762
returncode = EXIT_FAILURE;
1091
if(restore_loglevel){
1092
ret = klogctl(7, NULL, 0);
1097
#endif /* __linux__ */
1098
exitcode = EXIT_FAILURE;
765
1101
if((network.ifr_flags & IFF_UP) == 0){
766
1102
network.ifr_flags |= IFF_UP;
767
1103
ret = ioctl(sd, SIOCSIFFLAGS, &network);
769
1105
perror("ioctl SIOCSIFFLAGS");
770
returncode = EXIT_FAILURE;
777
avahi_set_log_function(empty_log);
780
/* Initialize the psuedo-RNG */
781
srand((unsigned int) time(NULL));
783
/* Allocate main loop object */
784
if (!(simple_poll = avahi_simple_poll_new())) {
785
fprintf(stderr, "Failed to create simple poll object.\n");
786
returncode = EXIT_FAILURE;
790
/* Do not publish any local records */
1106
exitcode = EXIT_FAILURE;
1108
if(restore_loglevel){
1109
ret = klogctl(7, NULL, 0);
1114
#endif /* __linux__ */
1117
interface_taken_up = true;
1119
/* sleep checking until interface is running */
1120
for(int i=0; i < delay * 4; i++){
1121
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1123
perror("ioctl SIOCGIFFLAGS");
1124
} else if(network.ifr_flags & IFF_RUNNING){
1127
struct timespec sleeptime = { .tv_nsec = 250000000 };
1128
ret = nanosleep(&sleeptime, NULL);
1129
if(ret == -1 and errno != EINTR){
1130
perror("nanosleep");
1133
if(not interface_taken_up){
1134
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1140
if(restore_loglevel){
1141
/* Restores kernel loglevel to default */
1142
ret = klogctl(7, NULL, 0);
1147
#endif /* __linux__ */
1164
ret = init_gnutls_global(pubkey, seckey);
1166
fprintf(stderr, "init_gnutls_global failed\n");
1167
exitcode = EXIT_FAILURE;
1170
gnutls_initialized = true;
1173
if(mkdtemp(tempdir) == NULL){
1177
tempdir_created = true;
1179
if(not init_gpgme(pubkey, seckey, tempdir)){
1180
fprintf(stderr, "init_gpgme failed\n");
1181
exitcode = EXIT_FAILURE;
1184
gpgme_initialized = true;
1187
if(interface[0] != '\0'){
1188
if_index = (AvahiIfIndex) if_nametoindex(interface);
1190
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1191
exitcode = EXIT_FAILURE;
1196
if(connect_to != NULL){
1197
/* Connect directly, do not use Zeroconf */
1198
/* (Mainly meant for debugging) */
1199
char *address = strrchr(connect_to, ':');
1200
if(address == NULL){
1201
fprintf(stderr, "No colon in address\n");
1202
exitcode = EXIT_FAILURE;
1207
tmpmax = strtoimax(address+1, &tmp, 10);
1208
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1209
or tmpmax != (uint16_t)tmpmax){
1210
fprintf(stderr, "Bad port number\n");
1211
exitcode = EXIT_FAILURE;
1214
port = (uint16_t)tmpmax;
1216
address = connect_to;
1217
/* Colon in address indicates IPv6 */
1219
if(strchr(address, ':') != NULL){
1224
ret = start_mandos_communication(address, port, if_index, af);
1226
exitcode = EXIT_FAILURE;
1228
exitcode = EXIT_SUCCESS;
1234
AvahiServerConfig config;
1235
/* Do not publish any local Zeroconf records */
791
1236
avahi_server_config_init(&config);
792
1237
config.publish_hinfo = 0;
793
1238
config.publish_addresses = 0;
794
1239
config.publish_workstation = 0;
795
1240
config.publish_domain = 0;
797
1242
/* Allocate a new server */
798
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
799
&config, NULL, NULL, &error);
801
/* Free the configuration data */
1243
mc.server = avahi_server_new(avahi_simple_poll_get
1244
(mc.simple_poll), &config, NULL,
1247
/* Free the Avahi configuration data */
802
1248
avahi_server_config_free(&config);
804
/* Check if creating the server object succeeded */
806
fprintf(stderr, "Failed to create server: %s\n",
807
avahi_strerror(error));
808
returncode = EXIT_FAILURE;
812
/* Create the service browser */
813
sb = avahi_s_service_browser_new(server, if_index,
815
"_mandos._tcp", NULL, 0,
816
browse_callback, server);
818
fprintf(stderr, "Failed to create service browser: %s\n",
819
avahi_strerror(avahi_server_errno(server)));
820
returncode = EXIT_FAILURE;
824
/* Run the main loop */
827
fprintf(stderr, "Starting avahi loop search\n");
830
avahi_simple_poll_loop(simple_poll);
835
fprintf(stderr, "%s exiting\n", argv[0]);
840
avahi_s_service_browser_free(sb);
843
avahi_server_free(server);
846
avahi_simple_poll_free(simple_poll);
1251
/* Check if creating the Avahi server object succeeded */
1252
if(mc.server == NULL){
1253
fprintf(stderr, "Failed to create Avahi server: %s\n",
1254
avahi_strerror(error));
1255
exitcode = EXIT_FAILURE;
1259
/* Create the Avahi service browser */
1260
sb = avahi_s_service_browser_new(mc.server, if_index,
1261
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1262
NULL, 0, browse_callback, NULL);
1264
fprintf(stderr, "Failed to create service browser: %s\n",
1265
avahi_strerror(avahi_server_errno(mc.server)));
1266
exitcode = EXIT_FAILURE;
1270
/* Run the main loop */
1273
fprintf(stderr, "Starting Avahi loop search\n");
1276
avahi_simple_poll_loop(mc.simple_poll);
1281
fprintf(stderr, "%s exiting\n", argv[0]);
1284
/* Cleanup things */
1286
avahi_s_service_browser_free(sb);
1288
if(mc.server != NULL)
1289
avahi_server_free(mc.server);
1291
if(mc.simple_poll != NULL)
1292
avahi_simple_poll_free(mc.simple_poll);
1294
if(gnutls_initialized){
1295
gnutls_certificate_free_credentials(mc.cred);
1296
gnutls_global_deinit();
1297
gnutls_dh_params_deinit(mc.dh_params);
1300
if(gpgme_initialized){
1301
gpgme_release(mc.ctx);
1304
/* Take down the network interface */
1305
if(interface_taken_up){
1306
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1308
perror("ioctl SIOCGIFFLAGS");
1309
} else if(network.ifr_flags & IFF_UP) {
1310
network.ifr_flags &= ~IFF_UP; /* clear flag */
1311
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1313
perror("ioctl SIOCSIFFLAGS");
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1322
/* Removes the temp directory used by GPGME */
1323
if(tempdir_created){
1325
struct dirent *direntry;
1326
d = opendir(tempdir);
1328
if(errno != ENOENT){
1333
direntry = readdir(d);
1334
if(direntry == NULL){
1337
/* Skip "." and ".." */
1338
if(direntry->d_name[0] == '.'
1339
and (direntry->d_name[1] == '\0'
1340
or (direntry->d_name[1] == '.'
1341
and direntry->d_name[2] == '\0'))){
1344
char *fullname = NULL;
1345
ret = asprintf(&fullname, "%s/%s", tempdir,
1351
ret = remove(fullname);
1353
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1360
ret = rmdir(tempdir);
1361
if(ret == -1 and errno != ENOENT){