26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@fukt.bsnet.se>.
28
* Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
29
* <https://www.fukt.bsnet.se/~teddy/>.
32
/* Needed by GPGME, specifically gpgme_data_seek() */
32
#define _FORTIFY_SOURCE 2
33
34
#define _LARGEFILE_SOURCE
34
35
#define _FILE_OFFSET_BITS 64
36
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
38
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
stdout, ferror(), sscanf(),
41
#include <stdint.h> /* uint16_t, uint32_t */
42
#include <stddef.h> /* NULL, size_t, ssize_t */
43
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
45
#include <stdbool.h> /* bool, true */
46
#include <string.h> /* memset(), strcmp(), strlen(),
47
strerror(), asprintf(), strcpy() */
48
#include <sys/ioctl.h> /* ioctl */
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
52
uid_t, gid_t, open(), opendir(),
54
#include <sys/stat.h> /* open() */
55
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
56
struct in6_addr, inet_pton(),
58
#include <fcntl.h> /* open() */
59
#include <dirent.h> /* opendir(), struct dirent, readdir()
61
#include <inttypes.h> /* PRIu16, intmax_t, SCNdMAX */
62
#include <assert.h> /* assert() */
63
#include <errno.h> /* perror(), errno */
64
#include <time.h> /* nanosleep(), time() */
65
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
66
SIOCSIFFLAGS, if_indextoname(),
67
if_nametoindex(), IF_NAMESIZE */
68
#include <netinet/in.h>
69
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
70
getuid(), getgid(), setuid(),
72
#include <arpa/inet.h> /* inet_pton(), htons */
73
#include <iso646.h> /* not, and, or */
74
#include <argp.h> /* struct argp_option, error_t, struct
75
argp_state, struct argp,
76
argp_parse(), ARGP_KEY_ARG,
77
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
78
#include <sys/klog.h> /* klogctl() */
81
/* All Avahi types, constants and functions
41
#include <net/if.h> /* if_nametoindex */
84
43
#include <avahi-core/core.h>
85
44
#include <avahi-core/lookup.h>
86
45
#include <avahi-core/log.h>
88
47
#include <avahi-common/malloc.h>
89
48
#include <avahi-common/error.h>
92
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
95
init_gnutls_session(),
97
#include <gnutls/openpgp.h>
98
/* gnutls_certificate_set_openpgp_key_file(),
99
GNUTLS_OPENPGP_FMT_BASE64 */
102
#include <gpgme.h> /* All GPGME types, constants and
105
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() */
108
71
#define BUFFER_SIZE 256
110
#define PATHDIR "/conf/conf.d/mandos"
111
#define SECKEY "seckey.txt"
112
#define PUBKEY "pubkey.txt"
74
const char *certdir = "/conf/conf.d/cryptkeyreq/";
75
const char *certfile = "openpgp-client.txt";
76
const char *certkey = "openpgp-client-key.txt";
114
78
bool debug = false;
115
static const char mandos_protocol_version[] = "1";
116
const char *argp_program_version = "mandos-client " VERSION;
117
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
119
/* Used for passing in values through the Avahi callback functions */
121
AvahiSimplePoll *simple_poll;
81
gnutls_session_t session;
123
82
gnutls_certificate_credentials_t cred;
124
unsigned int dh_bits;
125
83
gnutls_dh_params_t dh_params;
126
const char *priority;
87
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
char **new_packet, const char *homedir){
89
gpgme_data_t dh_crypto, dh_plain;
131
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
132
* "buffer_capacity" is how much is currently allocated,
133
* "buffer_length" is how much is already used.
135
size_t adjustbuffer(char **buffer, size_t buffer_length,
136
size_t buffer_capacity){
137
if(buffer_length + BUFFER_SIZE > buffer_capacity){
138
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
142
buffer_capacity += BUFFER_SIZE;
144
return buffer_capacity;
150
static bool init_gpgme(mandos_context *mc, const char *seckey,
151
const char *pubkey, const char *tempdir){
93
ssize_t new_packet_capacity = 0;
94
ssize_t new_packet_length = 0;
154
95
gpgme_engine_info_t engine_info;
158
* Helper function to insert pub and seckey to the engine keyring.
160
bool import_key(const char *filename){
162
gpgme_data_t pgp_data;
164
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
170
rc = gpgme_data_new_from_fd(&pgp_data, fd);
171
if(rc != GPG_ERR_NO_ERROR){
172
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
173
gpgme_strsource(rc), gpgme_strerror(rc));
177
rc = gpgme_op_import(mc->ctx, pgp_data);
178
if(rc != GPG_ERR_NO_ERROR){
179
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
180
gpgme_strsource(rc), gpgme_strerror(rc));
184
ret = (int)TEMP_FAILURE_RETRY(close(fd));
188
gpgme_data_release(pgp_data);
193
fprintf(stderr, "Initialize gpgme\n");
98
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
197
102
gpgme_check_version(NULL);
198
103
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
199
if(rc != GPG_ERR_NO_ERROR){
104
if (rc != GPG_ERR_NO_ERROR){
200
105
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
201
106
gpgme_strsource(rc), gpgme_strerror(rc));
205
/* Set GPGME home directory for the OpenPGP engine only */
206
rc = gpgme_get_engine_info(&engine_info);
207
if(rc != GPG_ERR_NO_ERROR){
110
/* Set GPGME home directory */
111
rc = gpgme_get_engine_info (&engine_info);
112
if (rc != GPG_ERR_NO_ERROR){
208
113
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
209
114
gpgme_strsource(rc), gpgme_strerror(rc));
212
117
while(engine_info != NULL){
213
118
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
214
119
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
215
engine_info->file_name, tempdir);
120
engine_info->file_name, homedir);
218
123
engine_info = engine_info->next;
220
125
if(engine_info == NULL){
221
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
225
/* Create new GPGME "context" */
226
rc = gpgme_new(&(mc->ctx));
227
if(rc != GPG_ERR_NO_ERROR){
228
fprintf(stderr, "bad gpgme_new: %s: %s\n",
229
gpgme_strsource(rc), gpgme_strerror(rc));
233
if(not import_key(pubkey) or not import_key(seckey)){
241
* Decrypt OpenPGP data.
242
* Returns -1 on error
244
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
245
const char *cryptotext,
248
gpgme_data_t dh_crypto, dh_plain;
251
size_t plaintext_capacity = 0;
252
ssize_t plaintext_length = 0;
255
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
258
/* Create new GPGME data buffer from memory cryptotext */
259
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
261
if(rc != GPG_ERR_NO_ERROR){
126
fprintf(stderr, "Could not set home dir to %s\n", homedir);
130
/* Create new GPGME data buffer from packet buffer */
131
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
132
if (rc != GPG_ERR_NO_ERROR){
262
133
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
263
134
gpgme_strsource(rc), gpgme_strerror(rc));
267
138
/* Create new empty GPGME data buffer for the plaintext */
268
139
rc = gpgme_data_new(&dh_plain);
269
if(rc != GPG_ERR_NO_ERROR){
140
if (rc != GPG_ERR_NO_ERROR){
270
141
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
271
142
gpgme_strsource(rc), gpgme_strerror(rc));
272
gpgme_data_release(dh_crypto);
276
/* Decrypt data from the cryptotext data buffer to the plaintext
278
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
279
if(rc != GPG_ERR_NO_ERROR){
146
/* Create new GPGME "context" */
147
rc = gpgme_new(&ctx);
148
if (rc != GPG_ERR_NO_ERROR){
149
fprintf(stderr, "bad gpgme_new: %s: %s\n",
150
gpgme_strsource(rc), gpgme_strerror(rc));
154
/* Decrypt data from the FILE pointer to the plaintext data
156
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
157
if (rc != GPG_ERR_NO_ERROR){
280
158
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
281
159
gpgme_strsource(rc), gpgme_strerror(rc));
282
plaintext_length = -1;
284
gpgme_decrypt_result_t result;
285
result = gpgme_op_decrypt_result(mc->ctx);
287
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
289
fprintf(stderr, "Unsupported algorithm: %s\n",
290
result->unsupported_algorithm);
291
fprintf(stderr, "Wrong key usage: %u\n",
292
result->wrong_key_usage);
293
if(result->file_name != NULL){
294
fprintf(stderr, "File name: %s\n", result->file_name);
296
gpgme_recipient_t recipient;
297
recipient = result->recipients;
299
while(recipient != NULL){
300
fprintf(stderr, "Public key algorithm: %s\n",
301
gpgme_pubkey_algo_name(recipient->pubkey_algo));
302
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
303
fprintf(stderr, "Secret key available: %s\n",
304
recipient->status == GPG_ERR_NO_SECKEY
306
recipient = recipient->next;
164
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
168
gpgme_decrypt_result_t result;
169
result = gpgme_op_decrypt_result(ctx);
171
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
173
fprintf(stderr, "Unsupported algorithm: %s\n",
174
result->unsupported_algorithm);
175
fprintf(stderr, "Wrong key usage: %d\n",
176
result->wrong_key_usage);
177
if(result->file_name != NULL){
178
fprintf(stderr, "File name: %s\n", result->file_name);
180
gpgme_recipient_t recipient;
181
recipient = result->recipients;
183
while(recipient != NULL){
184
fprintf(stderr, "Public key algorithm: %s\n",
185
gpgme_pubkey_algo_name(recipient->pubkey_algo));
186
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
187
fprintf(stderr, "Secret key available: %s\n",
188
recipient->status == GPG_ERR_NO_SECKEY
190
recipient = recipient->next;
315
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
196
/* Delete the GPGME FILE pointer cryptotext data buffer */
197
gpgme_data_release(dh_crypto);
318
199
/* Seek back to the beginning of the GPGME plaintext data buffer */
319
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
320
perror("gpgme_data_seek");
321
plaintext_length = -1;
200
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
201
perror("pgpme_data_seek");
327
plaintext_capacity = adjustbuffer(plaintext,
328
(size_t)plaintext_length,
330
if(plaintext_capacity == 0){
331
perror("adjustbuffer");
332
plaintext_length = -1;
206
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
207
*new_packet = realloc(*new_packet,
208
(unsigned int)new_packet_capacity
210
if (*new_packet == NULL){
214
new_packet_capacity += BUFFER_SIZE;
336
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
217
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
338
219
/* Print the data, if any */
344
224
perror("gpgme_data_read");
345
plaintext_length = -1;
348
plaintext_length += ret;
352
fprintf(stderr, "Decrypted password is: ");
353
for(ssize_t i = 0; i < plaintext_length; i++){
354
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
356
fprintf(stderr, "\n");
361
/* Delete the GPGME cryptotext data buffer */
362
gpgme_data_release(dh_crypto);
227
new_packet_length += ret;
230
/* FIXME: check characters before printing to screen so to not print
231
terminal control characters */
233
/* fprintf(stderr, "decrypted password is: "); */
234
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
235
/* fprintf(stderr, "\n"); */
364
238
/* Delete the GPGME plaintext data buffer */
365
239
gpgme_data_release(dh_plain);
366
return plaintext_length;
240
return new_packet_length;
369
static const char * safer_gnutls_strerror(int value) {
370
const char *ret = gnutls_strerror(value); /* Spurious warning from
371
-Wunreachable-code */
243
static const char * safer_gnutls_strerror (int value) {
244
const char *ret = gnutls_strerror (value);
373
246
ret = "(unknown)";
377
/* GnuTLS log function callback */
378
static void debuggnutls(__attribute__((unused)) int level,
380
fprintf(stderr, "GnuTLS: %s", string);
250
void debuggnutls(__attribute__((unused)) int level,
252
fprintf(stderr, "%s", string);
383
static int init_gnutls_global(mandos_context *mc,
384
const char *pubkeyfilename,
385
const char *seckeyfilename){
255
int initgnutls(encrypted_session *es){
389
260
fprintf(stderr, "Initializing GnuTLS\n");
392
ret = gnutls_global_init();
393
if(ret != GNUTLS_E_SUCCESS) {
394
fprintf(stderr, "GnuTLS global_init: %s\n",
395
safer_gnutls_strerror(ret));
263
if ((ret = gnutls_global_init ())
264
!= GNUTLS_E_SUCCESS) {
265
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
400
/* "Use a log level over 10 to enable all debugging options."
403
270
gnutls_global_set_log_level(11);
404
271
gnutls_global_set_log_function(debuggnutls);
407
/* OpenPGP credentials */
408
gnutls_certificate_allocate_credentials(&mc->cred);
409
if(ret != GNUTLS_E_SUCCESS){
410
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
414
safer_gnutls_strerror(ret));
415
gnutls_global_deinit();
274
/* openpgp credentials */
275
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
276
!= GNUTLS_E_SUCCESS) {
277
fprintf (stderr, "memory error: %s\n",
278
safer_gnutls_strerror(ret));
420
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
421
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
283
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
284
" and keyfile %s as GnuTLS credentials\n", certfile,
425
288
ret = gnutls_certificate_set_openpgp_key_file
426
(mc->cred, pubkeyfilename, seckeyfilename,
427
GNUTLS_OPENPGP_FMT_BASE64);
428
if(ret != GNUTLS_E_SUCCESS) {
430
"Error[%d] while reading the OpenPGP key pair ('%s',"
431
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
432
fprintf(stderr, "The GnuTLS error is: %s\n",
433
safer_gnutls_strerror(ret));
437
/* GnuTLS server initialization */
438
ret = gnutls_dh_params_init(&mc->dh_params);
439
if(ret != GNUTLS_E_SUCCESS) {
440
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
441
" %s\n", safer_gnutls_strerror(ret));
444
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
445
if(ret != GNUTLS_E_SUCCESS) {
446
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
447
safer_gnutls_strerror(ret));
451
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
457
gnutls_certificate_free_credentials(mc->cred);
458
gnutls_global_deinit();
459
gnutls_dh_params_deinit(mc->dh_params);
463
static int init_gnutls_session(mandos_context *mc,
464
gnutls_session_t *session){
466
/* GnuTLS session creation */
467
ret = gnutls_init(session, GNUTLS_SERVER);
468
if(ret != GNUTLS_E_SUCCESS){
289
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
290
if (ret != GNUTLS_E_SUCCESS) {
292
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
294
ret, certfile, certkey);
295
fprintf(stdout, "The Error is: %s\n",
296
safer_gnutls_strerror(ret));
300
//GnuTLS server initialization
301
if ((ret = gnutls_dh_params_init (&es->dh_params))
302
!= GNUTLS_E_SUCCESS) {
303
fprintf (stderr, "Error in dh parameter initialization: %s\n",
304
safer_gnutls_strerror(ret));
308
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
309
!= GNUTLS_E_SUCCESS) {
310
fprintf (stderr, "Error in prime generation: %s\n",
311
safer_gnutls_strerror(ret));
315
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
317
// GnuTLS session creation
318
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
319
!= GNUTLS_E_SUCCESS){
469
320
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
470
321
safer_gnutls_strerror(ret));
475
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
476
if(ret != GNUTLS_E_SUCCESS) {
477
fprintf(stderr, "Syntax error at: %s\n", err);
478
fprintf(stderr, "GnuTLS error: %s\n",
479
safer_gnutls_strerror(ret));
480
gnutls_deinit(*session);
324
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
325
!= GNUTLS_E_SUCCESS) {
326
fprintf(stderr, "Syntax error at: %s\n", err);
327
fprintf(stderr, "GnuTLS error: %s\n",
328
safer_gnutls_strerror(ret));
485
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
487
if(ret != GNUTLS_E_SUCCESS) {
488
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
332
if ((ret = gnutls_credentials_set
333
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
334
!= GNUTLS_E_SUCCESS) {
335
fprintf(stderr, "Error setting a credentials set: %s\n",
489
336
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
494
340
/* ignore client certificate if any. */
495
gnutls_certificate_server_set_request(*session,
341
gnutls_certificate_server_set_request (es->session,
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
344
gnutls_dh_set_prime_bits (es->session, DH_BITS);
503
/* Avahi log function callback */
504
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
505
__attribute__((unused)) const char *txt){}
349
void empty_log(__attribute__((unused)) AvahiLogLevel level,
350
__attribute__((unused)) const char *txt){}
507
/* Called when a Mandos server is found */
508
static int start_mandos_communication(const char *ip, uint16_t port,
509
AvahiIfIndex if_index,
352
int start_mandos_communication(const char *ip, uint16_t port,
353
unsigned int if_index){
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
355
struct sockaddr_in6 to;
356
encrypted_session es;
514
357
char *buffer = NULL;
515
358
char *decrypted_buffer;
516
359
size_t buffer_length = 0;
517
360
size_t buffer_capacity = 0;
518
361
ssize_t decrypted_buffer_size;
521
364
char interface[IF_NAMESIZE];
522
gnutls_session_t session;
524
ret = init_gnutls_session(mc, &session);
530
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
367
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
534
370
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
541
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(if_indextoname(if_index, interface) == NULL){
542
378
perror("if_indextoname");
545
384
fprintf(stderr, "Binding to interface %s\n", interface);
548
memset(&to, 0, sizeof(to));
549
to.in6.sin6_family = AF_INET6;
550
/* It would be nice to have a way to detect if we were passed an
551
IPv4 address here. Now we assume an IPv6 address. */
552
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
387
memset(&to,0,sizeof(to)); /* Spurious warning */
388
to.sin6_family = AF_INET6;
389
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
554
391
perror("inet_pton");
558
395
fprintf(stderr, "Bad address: %s\n", ip);
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
563
-Wunreachable-code */
398
to.sin6_port = htons(port); /* Spurious warning */
565
to.in6.sin6_scope_id = (uint32_t)if_index;
400
to.sin6_scope_id = (uint32_t)if_index;
568
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
570
char addrstr[INET6_ADDRSTRLEN] = "";
571
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
572
sizeof(addrstr)) == NULL){
575
if(strcmp(addrstr, ip) != 0){
576
fprintf(stderr, "Canonical address form: %s\n", addrstr);
403
fprintf(stderr, "Connection to: %s\n", ip);
581
ret = connect(tcp_sd, &to.in, sizeof(to));
406
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
583
408
perror("connect");
587
const char *out = mandos_protocol_version;
590
size_t out_size = strlen(out);
591
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
592
out_size - written));
598
written += (size_t)ret;
599
if(written < out_size){
602
if(out == mandos_protocol_version){
412
ret = initgnutls (&es);
418
gnutls_transport_set_ptr (es.session,
419
(gnutls_transport_ptr_t) tcp_sd);
612
422
fprintf(stderr, "Establishing TLS session with %s\n", ip);
615
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
618
ret = gnutls_handshake(session);
619
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
621
if(ret != GNUTLS_E_SUCCESS){
425
ret = gnutls_handshake (es.session);
427
if (ret != GNUTLS_E_SUCCESS){
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
429
fprintf(stderr, "\n*** Handshake failed ***\n");
630
/* Read OpenPGP packet that contains the wanted password */
436
//Retrieve OpenPGP packet that contains the wanted password
633
439
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
640
if(buffer_capacity == 0){
641
perror("adjustbuffer");
444
if (buffer_length + BUFFER_SIZE > buffer_capacity){
445
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
450
buffer_capacity += BUFFER_SIZE;
646
sret = gnutls_record_recv(session, buffer+buffer_length,
453
ret = gnutls_record_recv
454
(es.session, buffer+buffer_length, BUFFER_SIZE);
653
460
case GNUTLS_E_INTERRUPTED:
654
461
case GNUTLS_E_AGAIN:
656
463
case GNUTLS_E_REHANDSHAKE:
658
ret = gnutls_handshake(session);
659
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
661
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
464
ret = gnutls_handshake (es.session);
466
fprintf(stderr, "\n*** Handshake failed ***\n");
668
473
fprintf(stderr, "Unknown error while reading data from"
669
" encrypted session with Mandos server\n");
474
" encrypted session with mandos server\n");
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
476
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
675
buffer_length += (size_t) sret;
480
buffer_length += (size_t) ret;
680
fprintf(stderr, "Closing TLS session\n");
683
gnutls_bye(session, GNUTLS_SHUT_RDWR);
685
if(buffer_length > 0){
686
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
484
if (buffer_length > 0){
485
decrypted_buffer_size = pgp_packet_decrypt(buffer,
689
if(decrypted_buffer_size >= 0){
691
while(written < (size_t) decrypted_buffer_size){
692
ret = (int)fwrite(decrypted_buffer + written, 1,
693
(size_t)decrypted_buffer_size - written,
489
if (decrypted_buffer_size >= 0){
490
while(written < decrypted_buffer_size){
491
ret = (int)fwrite (decrypted_buffer + written, 1,
492
(size_t)decrypted_buffer_size - written,
695
494
if(ret == 0 and ferror(stdout)){
697
496
fprintf(stderr, "Error writing encrypted data: %s\n",
755
559
char ip[AVAHI_ADDRESS_STR_MAX];
756
560
avahi_address_snprint(ip, sizeof(ip), address);
758
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
759
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
760
ip, (intmax_t)interface, port);
562
fprintf(stderr, "Mandos server \"%s\" found on %s (%s) on"
563
" port %d\n", name, host_name, ip, port);
762
int ret = start_mandos_communication(ip, port, interface, mc);
764
avahi_simple_poll_quit(mc->simple_poll);
565
int ret = start_mandos_communication(ip, port,
566
(unsigned int) interface);
768
572
avahi_s_service_resolver_free(r);
771
static void browse_callback( AvahiSServiceBrowser *b,
772
AvahiIfIndex interface,
773
AvahiProtocol protocol,
774
AvahiBrowserEvent event,
778
AVAHI_GCC_UNUSED AvahiLookupResultFlags
781
mandos_context *mc = userdata;
784
/* Called whenever a new services becomes available on the LAN or
785
is removed from the LAN */
789
case AVAHI_BROWSER_FAILURE:
791
fprintf(stderr, "(Avahi browser) %s\n",
792
avahi_strerror(avahi_server_errno(mc->server)));
793
avahi_simple_poll_quit(mc->simple_poll);
796
case AVAHI_BROWSER_NEW:
797
/* We ignore the returned Avahi resolver object. In the callback
798
function we free it. If the Avahi server is terminated before
799
the callback function is called the Avahi server will free the
802
if(!(avahi_s_service_resolver_new(mc->server, interface,
803
protocol, name, type, domain,
804
AVAHI_PROTO_INET6, 0,
805
resolve_callback, mc)))
806
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
807
name, avahi_strerror(avahi_server_errno(mc->server)));
810
case AVAHI_BROWSER_REMOVE:
813
case AVAHI_BROWSER_ALL_FOR_NOW:
814
case AVAHI_BROWSER_CACHE_EXHAUSTED:
816
fprintf(stderr, "No Mandos server found, still searching...\n");
575
static void browse_callback(
576
AvahiSServiceBrowser *b,
577
AvahiIfIndex interface,
578
AvahiProtocol protocol,
579
AvahiBrowserEvent event,
583
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
586
AvahiServer *s = userdata;
587
assert(b); /* Spurious warning */
589
/* Called whenever a new services becomes available on the LAN or
590
is removed from the LAN */
594
case AVAHI_BROWSER_FAILURE:
596
fprintf(stderr, "(Browser) %s\n",
597
avahi_strerror(avahi_server_errno(server)));
598
avahi_simple_poll_quit(simple_poll);
601
case AVAHI_BROWSER_NEW:
602
/* We ignore the returned resolver object. In the callback
603
function we free it. If the server is terminated before
604
the callback function is called the server will free
605
the resolver for us. */
607
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
609
AVAHI_PROTO_INET6, 0,
610
resolve_callback, s)))
611
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
612
avahi_strerror(avahi_server_errno(s)));
615
case AVAHI_BROWSER_REMOVE:
618
case AVAHI_BROWSER_ALL_FOR_NOW:
619
case AVAHI_BROWSER_CACHE_EXHAUSTED:
822
int main(int argc, char *argv[]){
624
/* combinds file name and path and returns the malloced new string. som sane checks could/should be added */
625
const char *combinepath(const char *first, const char *second){
627
tmp = malloc(strlen(first) + strlen(second) + 2);
633
if (first[0] != '\0' and first[strlen(first) - 1] != '/'){
641
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
642
AvahiServerConfig config;
823
643
AvahiSServiceBrowser *sb = NULL;
828
int exitcode = EXIT_SUCCESS;
646
int returncode = EXIT_SUCCESS;
829
647
const char *interface = "eth0";
830
struct ifreq network;
834
char *connect_to = NULL;
835
char tempdir[] = "/tmp/mandosXXXXXX";
836
bool tempdir_created = false;
837
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
838
const char *seckey = PATHDIR "/" SECKEY;
839
const char *pubkey = PATHDIR "/" PUBKEY;
841
mandos_context mc = { .simple_poll = NULL, .server = NULL,
842
.dh_bits = 1024, .priority = "SECURE256"
843
":!CTYPE-X.509:+CTYPE-OPENPGP" };
844
bool gnutls_initialized = false;
845
bool gpgme_initialized = false;
849
struct argp_option options[] = {
850
{ .name = "debug", .key = 128,
851
.doc = "Debug mode", .group = 3 },
852
{ .name = "connect", .key = 'c',
853
.arg = "ADDRESS:PORT",
854
.doc = "Connect directly to a specific Mandos server",
856
{ .name = "interface", .key = 'i',
858
.doc = "Interface that will be used to search for Mandos"
861
{ .name = "seckey", .key = 's',
863
.doc = "OpenPGP secret key file base name",
865
{ .name = "pubkey", .key = 'p',
867
.doc = "OpenPGP public key file base name",
869
{ .name = "dh-bits", .key = 129,
871
.doc = "Bit length of the prime number used in the"
872
" Diffie-Hellman key exchange",
874
{ .name = "priority", .key = 130,
876
.doc = "GnuTLS priority string for the TLS handshake",
878
{ .name = "delay", .key = 131,
880
.doc = "Maximum delay to wait for interface startup",
885
error_t parse_opt(int key, char *arg,
886
struct argp_state *state) {
888
case 128: /* --debug */
891
case 'c': /* --connect */
894
case 'i': /* --interface */
897
case 's': /* --seckey */
900
case 'p': /* --pubkey */
903
case 129: /* --dh-bits */
904
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
905
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
906
or arg[numchars] != '\0'){
907
fprintf(stderr, "Bad number of DH bits\n");
910
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
912
case 130: /* --priority */
915
case 131: /* --delay */
916
ret = sscanf(arg, "%lf%n", &delay, &numchars);
917
if(ret < 1 or arg[numchars] != '\0'){
918
fprintf(stderr, "Bad delay\n");
927
return ARGP_ERR_UNKNOWN;
932
struct argp argp = { .options = options, .parser = parse_opt,
934
.doc = "Mandos client -- Get and decrypt"
935
" passwords from a Mandos server" };
936
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
937
if(ret == ARGP_ERR_UNKNOWN){
938
fprintf(stderr, "Unknown error while parsing arguments\n");
939
exitcode = EXIT_FAILURE;
944
/* If the interface is down, bring it up */
946
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
947
messages to mess up the prompt */
948
ret = klogctl(8, NULL, 5);
953
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
956
exitcode = EXIT_FAILURE;
957
ret = klogctl(7, NULL, 0);
963
strcpy(network.ifr_name, interface);
964
ret = ioctl(sd, SIOCGIFFLAGS, &network);
966
perror("ioctl SIOCGIFFLAGS");
967
ret = klogctl(7, NULL, 0);
971
exitcode = EXIT_FAILURE;
974
if((network.ifr_flags & IFF_UP) == 0){
975
network.ifr_flags |= IFF_UP;
976
ret = ioctl(sd, SIOCSIFFLAGS, &network);
978
perror("ioctl SIOCSIFFLAGS");
979
exitcode = EXIT_FAILURE;
980
ret = klogctl(7, NULL, 0);
987
/* sleep checking until interface is running */
988
for(int i=0; i < delay * 4; i++){
989
ret = ioctl(sd, SIOCGIFFLAGS, &network);
991
perror("ioctl SIOCGIFFLAGS");
992
} else if(network.ifr_flags & IFF_RUNNING){
995
struct timespec sleeptime = { .tv_nsec = 250000000 };
996
nanosleep(&sleeptime, NULL);
998
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1002
/* Restores kernel loglevel to default */
1003
ret = klogctl(7, NULL, 0);
1022
ret = init_gnutls_global(&mc, pubkey, seckey);
1024
fprintf(stderr, "init_gnutls_global failed\n");
1025
exitcode = EXIT_FAILURE;
1028
gnutls_initialized = true;
1031
if(mkdtemp(tempdir) == NULL){
1035
tempdir_created = true;
1037
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
1038
fprintf(stderr, "init_gpgme failed\n");
1039
exitcode = EXIT_FAILURE;
1042
gpgme_initialized = true;
1045
if_index = (AvahiIfIndex) if_nametoindex(interface);
1047
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1048
exitcode = EXIT_FAILURE;
1052
if(connect_to != NULL){
1053
/* Connect directly, do not use Zeroconf */
1054
/* (Mainly meant for debugging) */
1055
char *address = strrchr(connect_to, ':');
1056
if(address == NULL){
1057
fprintf(stderr, "No colon in address\n");
1058
exitcode = EXIT_FAILURE;
1062
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1063
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1064
or address[numchars+1] != '\0'){
1065
fprintf(stderr, "Bad port number\n");
1066
exitcode = EXIT_FAILURE;
1069
port = (uint16_t)tmpmax;
1071
address = connect_to;
1072
ret = start_mandos_communication(address, port, if_index, &mc);
1074
exitcode = EXIT_FAILURE;
1076
exitcode = EXIT_SUCCESS;
650
static struct option long_options[] = {
651
{"debug", no_argument, (int *)&debug, 1},
652
{"interface", required_argument, 0, 'i'},
653
{"certdir", required_argument, 0, 'd'},
654
{"certkey", required_argument, 0, 'c'},
655
{"certfile", required_argument, 0, 'k'},
658
int option_index = 0;
659
ret = getopt_long (argc, argv, "i:", long_options,
686
certfile = combinepath(certdir, certfile);
687
if (certfile == NULL){
691
certkey = combinepath(certdir, certkey);
692
if (certkey == NULL){
1082
697
avahi_set_log_function(empty_log);
1085
/* Initialize the pseudo-RNG for Avahi */
700
/* Initialize the psuedo-RNG */
1086
701
srand((unsigned int) time(NULL));
1088
/* Allocate main Avahi loop object */
1089
mc.simple_poll = avahi_simple_poll_new();
1090
if(mc.simple_poll == NULL) {
1091
fprintf(stderr, "Avahi: Failed to create simple poll"
1093
exitcode = EXIT_FAILURE;
1098
AvahiServerConfig config;
1099
/* Do not publish any local Zeroconf records */
1100
avahi_server_config_init(&config);
1101
config.publish_hinfo = 0;
1102
config.publish_addresses = 0;
1103
config.publish_workstation = 0;
1104
config.publish_domain = 0;
1106
/* Allocate a new server */
1107
mc.server = avahi_server_new(avahi_simple_poll_get
1108
(mc.simple_poll), &config, NULL,
1111
/* Free the Avahi configuration data */
1112
avahi_server_config_free(&config);
1115
/* Check if creating the Avahi server object succeeded */
1116
if(mc.server == NULL) {
1117
fprintf(stderr, "Failed to create Avahi server: %s\n",
703
/* Allocate main loop object */
704
if (!(simple_poll = avahi_simple_poll_new())) {
705
fprintf(stderr, "Failed to create simple poll object.\n");
710
/* Do not publish any local records */
711
avahi_server_config_init(&config);
712
config.publish_hinfo = 0;
713
config.publish_addresses = 0;
714
config.publish_workstation = 0;
715
config.publish_domain = 0;
717
/* Allocate a new server */
718
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
719
&config, NULL, NULL, &error);
721
/* Free the configuration data */
722
avahi_server_config_free(&config);
724
/* Check if creating the server object succeeded */
726
fprintf(stderr, "Failed to create server: %s\n",
1118
727
avahi_strerror(error));
1119
exitcode = EXIT_FAILURE;
728
returncode = EXIT_FAILURE;
1123
/* Create the Avahi service browser */
1124
sb = avahi_s_service_browser_new(mc.server, if_index,
732
/* Create the service browser */
733
sb = avahi_s_service_browser_new(server,
735
if_nametoindex(interface),
1125
736
AVAHI_PROTO_INET6,
1126
737
"_mandos._tcp", NULL, 0,
1127
browse_callback, &mc);
738
browse_callback, server);
1129
740
fprintf(stderr, "Failed to create service browser: %s\n",
1130
avahi_strerror(avahi_server_errno(mc.server)));
1131
exitcode = EXIT_FAILURE;
741
avahi_strerror(avahi_server_errno(server)));
742
returncode = EXIT_FAILURE;
1135
746
/* Run the main loop */
1138
fprintf(stderr, "Starting Avahi loop search\n");
749
fprintf(stderr, "Starting avahi loop search\n");
752
avahi_simple_poll_loop(simple_poll);
1141
avahi_simple_poll_loop(mc.simple_poll);
1146
757
fprintf(stderr, "%s exiting\n", argv[0]);
1149
760
/* Cleanup things */
1151
762
avahi_s_service_browser_free(sb);
1153
if(mc.server != NULL)
1154
avahi_server_free(mc.server);
1156
if(mc.simple_poll != NULL)
1157
avahi_simple_poll_free(mc.simple_poll);
1159
if(gnutls_initialized){
1160
gnutls_certificate_free_credentials(mc.cred);
1161
gnutls_global_deinit();
1162
gnutls_dh_params_deinit(mc.dh_params);
1165
if(gpgme_initialized){
1166
gpgme_release(mc.ctx);
1169
/* Removes the temp directory used by GPGME */
1170
if(tempdir_created){
1172
struct dirent *direntry;
1173
d = opendir(tempdir);
1175
if(errno != ENOENT){
1180
direntry = readdir(d);
1181
if(direntry == NULL){
1184
/* Skip "." and ".." */
1185
if(direntry->d_name[0] == '.'
1186
and (direntry->d_name[1] == '\0'
1187
or (direntry->d_name[1] == '.'
1188
and direntry->d_name[2] == '\0'))){
1191
char *fullname = NULL;
1192
ret = asprintf(&fullname, "%s/%s", tempdir,
1198
ret = remove(fullname);
1200
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1207
ret = rmdir(tempdir);
1208
if(ret == -1 and errno != ENOENT){
765
avahi_server_free(server);
768
avahi_simple_poll_free(simple_poll);