33
32
#define _LARGEFILE_SOURCE
34
33
#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> /* 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 */
80
/* All Avahi types, constants and functions
39
#include <net/if.h> /* if_nametoindex */
83
41
#include <avahi-core/core.h>
84
42
#include <avahi-core/lookup.h>
85
43
#include <avahi-core/log.h>
87
45
#include <avahi-common/malloc.h>
88
46
#include <avahi-common/error.h>
91
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
94
init_gnutls_session(),
96
#include <gnutls/openpgp.h>
97
/* gnutls_certificate_set_openpgp_key_file(),
98
GNUTLS_OPENPGP_FMT_BASE64 */
101
#include <gpgme.h> /* All GPGME types, constants and
104
GPGME_PROTOCOL_OpenPGP,
49
#include <sys/types.h> /* socket(), inet_pton() */
50
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
51
struct in6_addr, inet_pton() */
52
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
53
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
55
#include <unistd.h> /* close() */
56
#include <netinet/in.h>
57
#include <stdbool.h> /* true */
58
#include <string.h> /* memset */
59
#include <arpa/inet.h> /* inet_pton() */
60
#include <iso646.h> /* not */
63
#include <errno.h> /* perror() */
107
69
#define BUFFER_SIZE 256
109
#define PATHDIR "/conf/conf.d/mandos"
110
#define SECKEY "seckey.txt"
111
#define PUBKEY "pubkey.txt"
72
static const char *certdir = "/conf/conf.d/mandos";
73
static const char *certfile = "openpgp-client.txt";
74
static const char *certkey = "openpgp-client-key.txt";
113
76
bool debug = false;
114
static const char mandos_protocol_version[] = "1";
115
const char *argp_program_version = "mandos-client " VERSION;
116
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
118
/* Used for passing in values through the Avahi callback functions */
120
AvahiSimplePoll *simple_poll;
79
gnutls_session_t session;
122
80
gnutls_certificate_credentials_t cred;
123
unsigned int dh_bits;
124
81
gnutls_dh_params_t dh_params;
125
const char *priority;
85
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
gpgme_data_t dh_crypto, dh_plain;
130
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
131
* "buffer_capacity" is how much is currently allocated,
132
* "buffer_length" is how much is already used.
134
size_t adjustbuffer(char **buffer, size_t buffer_length,
135
size_t buffer_capacity){
136
if(buffer_length + BUFFER_SIZE > buffer_capacity){
137
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
141
buffer_capacity += BUFFER_SIZE;
143
return buffer_capacity;
149
static bool init_gpgme(mandos_context *mc, const char *seckey,
150
const char *pubkey, const char *tempdir){
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
153
94
gpgme_engine_info_t engine_info;
157
* Helper function to insert pub and seckey to the enigne keyring.
159
bool import_key(const char *filename){
161
gpgme_data_t pgp_data;
163
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
169
rc = gpgme_data_new_from_fd(&pgp_data, fd);
170
if(rc != GPG_ERR_NO_ERROR){
171
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
172
gpgme_strsource(rc), gpgme_strerror(rc));
176
rc = gpgme_op_import(mc->ctx, pgp_data);
177
if(rc != GPG_ERR_NO_ERROR){
178
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
179
gpgme_strsource(rc), gpgme_strerror(rc));
183
ret = (int)TEMP_FAILURE_RETRY(close(fd));
187
gpgme_data_release(pgp_data);
192
fprintf(stderr, "Initialize gpgme\n");
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
196
101
gpgme_check_version(NULL);
197
102
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
198
if(rc != GPG_ERR_NO_ERROR){
103
if (rc != GPG_ERR_NO_ERROR){
199
104
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
200
105
gpgme_strsource(rc), gpgme_strerror(rc));
204
/* Set GPGME home directory for the OpenPGP engine only */
205
rc = gpgme_get_engine_info(&engine_info);
206
if(rc != GPG_ERR_NO_ERROR){
109
/* Set GPGME home directory */
110
rc = gpgme_get_engine_info (&engine_info);
111
if (rc != GPG_ERR_NO_ERROR){
207
112
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
208
113
gpgme_strsource(rc), gpgme_strerror(rc));
211
116
while(engine_info != NULL){
212
117
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
213
118
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
214
engine_info->file_name, tempdir);
119
engine_info->file_name, homedir);
217
122
engine_info = engine_info->next;
219
124
if(engine_info == NULL){
220
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
224
/* Create new GPGME "context" */
225
rc = gpgme_new(&(mc->ctx));
226
if(rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
232
if(not import_key(pubkey) or not import_key(seckey)){
240
* Decrypt OpenPGP data.
241
* Returns -1 on error
243
static ssize_t pgp_packet_decrypt(const mandos_context *mc,
244
const char *cryptotext,
247
gpgme_data_t dh_crypto, dh_plain;
250
size_t plaintext_capacity = 0;
251
ssize_t plaintext_length = 0;
254
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
257
/* Create new GPGME data buffer from memory cryptotext */
258
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
260
if(rc != GPG_ERR_NO_ERROR){
125
fprintf(stderr, "Could not set home dir to %s\n", homedir);
129
/* Create new GPGME data buffer from packet buffer */
130
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
131
if (rc != GPG_ERR_NO_ERROR){
261
132
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
262
133
gpgme_strsource(rc), gpgme_strerror(rc));
266
137
/* Create new empty GPGME data buffer for the plaintext */
267
138
rc = gpgme_data_new(&dh_plain);
268
if(rc != GPG_ERR_NO_ERROR){
139
if (rc != GPG_ERR_NO_ERROR){
269
140
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
270
141
gpgme_strsource(rc), gpgme_strerror(rc));
271
gpgme_data_release(dh_crypto);
275
/* Decrypt data from the cryptotext data buffer to the plaintext
277
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
278
if(rc != GPG_ERR_NO_ERROR){
145
/* Create new GPGME "context" */
146
rc = gpgme_new(&ctx);
147
if (rc != GPG_ERR_NO_ERROR){
148
fprintf(stderr, "bad gpgme_new: %s: %s\n",
149
gpgme_strsource(rc), gpgme_strerror(rc));
153
/* Decrypt data from the FILE pointer to the plaintext data
155
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
156
if (rc != GPG_ERR_NO_ERROR){
279
157
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
280
158
gpgme_strsource(rc), gpgme_strerror(rc));
281
plaintext_length = -1;
283
gpgme_decrypt_result_t result;
284
result = gpgme_op_decrypt_result(mc->ctx);
286
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
288
fprintf(stderr, "Unsupported algorithm: %s\n",
289
result->unsupported_algorithm);
290
fprintf(stderr, "Wrong key usage: %u\n",
291
result->wrong_key_usage);
292
if(result->file_name != NULL){
293
fprintf(stderr, "File name: %s\n", result->file_name);
295
gpgme_recipient_t recipient;
296
recipient = result->recipients;
298
while(recipient != NULL){
299
fprintf(stderr, "Public key algorithm: %s\n",
300
gpgme_pubkey_algo_name(recipient->pubkey_algo));
301
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
302
fprintf(stderr, "Secret key available: %s\n",
303
recipient->status == GPG_ERR_NO_SECKEY
305
recipient = recipient->next;
163
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
167
gpgme_decrypt_result_t result;
168
result = gpgme_op_decrypt_result(ctx);
170
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
172
fprintf(stderr, "Unsupported algorithm: %s\n",
173
result->unsupported_algorithm);
174
fprintf(stderr, "Wrong key usage: %d\n",
175
result->wrong_key_usage);
176
if(result->file_name != NULL){
177
fprintf(stderr, "File name: %s\n", result->file_name);
179
gpgme_recipient_t recipient;
180
recipient = result->recipients;
182
while(recipient != NULL){
183
fprintf(stderr, "Public key algorithm: %s\n",
184
gpgme_pubkey_algo_name(recipient->pubkey_algo));
185
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
186
fprintf(stderr, "Secret key available: %s\n",
187
recipient->status == GPG_ERR_NO_SECKEY
189
recipient = recipient->next;
314
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
317
198
/* Seek back to the beginning of the GPGME plaintext data buffer */
318
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
319
perror("gpgme_data_seek");
320
plaintext_length = -1;
199
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
200
perror("pgpme_data_seek");
326
plaintext_capacity = adjustbuffer(plaintext,
327
(size_t)plaintext_length,
329
if(plaintext_capacity == 0){
330
perror("adjustbuffer");
331
plaintext_length = -1;
205
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
206
*new_packet = realloc(*new_packet,
207
(unsigned int)new_packet_capacity
209
if (*new_packet == NULL){
213
new_packet_capacity += BUFFER_SIZE;
335
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
337
218
/* Print the data, if any */
343
223
perror("gpgme_data_read");
344
plaintext_length = -1;
347
plaintext_length += ret;
351
fprintf(stderr, "Decrypted password is: ");
352
for(ssize_t i = 0; i < plaintext_length; i++){
353
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
355
fprintf(stderr, "\n");
360
/* Delete the GPGME cryptotext data buffer */
361
gpgme_data_release(dh_crypto);
226
new_packet_length += ret;
229
/* FIXME: check characters before printing to screen so to not print
230
terminal control characters */
232
/* fprintf(stderr, "decrypted password is: "); */
233
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
234
/* fprintf(stderr, "\n"); */
363
237
/* Delete the GPGME plaintext data buffer */
364
238
gpgme_data_release(dh_plain);
365
return plaintext_length;
239
return new_packet_length;
368
static const char * safer_gnutls_strerror(int value) {
369
const char *ret = gnutls_strerror(value); /* Spurious warning from
370
-Wunreachable-code */
242
static const char * safer_gnutls_strerror (int value) {
243
const char *ret = gnutls_strerror (value);
372
245
ret = "(unknown)";
376
/* GnuTLS log function callback */
377
249
static void debuggnutls(__attribute__((unused)) int level,
378
250
const char* string){
379
fprintf(stderr, "GnuTLS: %s", string);
251
fprintf(stderr, "%s", string);
382
static int init_gnutls_global(mandos_context *mc,
383
const char *pubkeyfilename,
384
const char *seckeyfilename){
254
static int initgnutls(encrypted_session *es){
388
259
fprintf(stderr, "Initializing GnuTLS\n");
391
ret = gnutls_global_init();
392
if(ret != GNUTLS_E_SUCCESS) {
393
fprintf(stderr, "GnuTLS global_init: %s\n",
394
safer_gnutls_strerror(ret));
262
if ((ret = gnutls_global_init ())
263
!= GNUTLS_E_SUCCESS) {
264
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
399
/* "Use a log level over 10 to enable all debugging options."
402
269
gnutls_global_set_log_level(11);
403
270
gnutls_global_set_log_function(debuggnutls);
406
/* OpenPGP credentials */
407
gnutls_certificate_allocate_credentials(&mc->cred);
408
if(ret != GNUTLS_E_SUCCESS){
409
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
413
safer_gnutls_strerror(ret));
414
gnutls_global_deinit();
273
/* openpgp credentials */
274
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
275
!= GNUTLS_E_SUCCESS) {
276
fprintf (stderr, "memory error: %s\n",
277
safer_gnutls_strerror(ret));
419
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
420
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
282
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
283
" and keyfile %s as GnuTLS credentials\n", certfile,
424
287
ret = gnutls_certificate_set_openpgp_key_file
425
(mc->cred, pubkeyfilename, seckeyfilename,
426
GNUTLS_OPENPGP_FMT_BASE64);
427
if(ret != GNUTLS_E_SUCCESS) {
429
"Error[%d] while reading the OpenPGP key pair ('%s',"
430
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
431
fprintf(stderr, "The GnuTLS error is: %s\n",
432
safer_gnutls_strerror(ret));
436
/* GnuTLS server initialization */
437
ret = gnutls_dh_params_init(&mc->dh_params);
438
if(ret != GNUTLS_E_SUCCESS) {
439
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
440
" %s\n", safer_gnutls_strerror(ret));
443
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
444
if(ret != GNUTLS_E_SUCCESS) {
445
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
446
safer_gnutls_strerror(ret));
450
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
456
gnutls_certificate_free_credentials(mc->cred);
457
gnutls_global_deinit();
458
gnutls_dh_params_deinit(mc->dh_params);
462
static int init_gnutls_session(mandos_context *mc,
463
gnutls_session_t *session){
465
/* GnuTLS session creation */
466
ret = gnutls_init(session, GNUTLS_SERVER);
467
if(ret != GNUTLS_E_SUCCESS){
288
(es->cred, certfile, certkey, GNUTLS_OPENPGP_FMT_BASE64);
289
if (ret != GNUTLS_E_SUCCESS) {
291
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
293
ret, certfile, certkey);
294
fprintf(stdout, "The Error is: %s\n",
295
safer_gnutls_strerror(ret));
299
//GnuTLS server initialization
300
if ((ret = gnutls_dh_params_init (&es->dh_params))
301
!= GNUTLS_E_SUCCESS) {
302
fprintf (stderr, "Error in dh parameter initialization: %s\n",
303
safer_gnutls_strerror(ret));
307
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
308
!= GNUTLS_E_SUCCESS) {
309
fprintf (stderr, "Error in prime generation: %s\n",
310
safer_gnutls_strerror(ret));
314
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
316
// GnuTLS session creation
317
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
318
!= GNUTLS_E_SUCCESS){
468
319
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
469
320
safer_gnutls_strerror(ret));
474
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
475
if(ret != GNUTLS_E_SUCCESS) {
476
fprintf(stderr, "Syntax error at: %s\n", err);
477
fprintf(stderr, "GnuTLS error: %s\n",
478
safer_gnutls_strerror(ret));
479
gnutls_deinit(*session);
323
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
324
!= GNUTLS_E_SUCCESS) {
325
fprintf(stderr, "Syntax error at: %s\n", err);
326
fprintf(stderr, "GnuTLS error: %s\n",
327
safer_gnutls_strerror(ret));
484
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
486
if(ret != GNUTLS_E_SUCCESS) {
487
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
331
if ((ret = gnutls_credentials_set
332
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
333
!= GNUTLS_E_SUCCESS) {
334
fprintf(stderr, "Error setting a credentials set: %s\n",
488
335
safer_gnutls_strerror(ret));
489
gnutls_deinit(*session);
493
339
/* ignore client certificate if any. */
494
gnutls_certificate_server_set_request(*session,
340
gnutls_certificate_server_set_request (es->session,
497
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
502
/* Avahi log function callback */
503
348
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
504
349
__attribute__((unused)) const char *txt){}
506
/* Called when a Mandos server is found */
507
351
static int start_mandos_communication(const char *ip, uint16_t port,
508
AvahiIfIndex if_index,
352
AvahiIfIndex if_index){
512
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
354
struct sockaddr_in6 to;
355
encrypted_session es;
513
356
char *buffer = NULL;
514
357
char *decrypted_buffer;
515
358
size_t buffer_length = 0;
516
359
size_t buffer_capacity = 0;
517
360
ssize_t decrypted_buffer_size;
520
363
char interface[IF_NAMESIZE];
521
gnutls_session_t session;
523
ret = init_gnutls_session(mc, &session);
529
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
366
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
533
370
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
540
if(if_indextoname((unsigned int)if_index, interface) == NULL){
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
541
378
perror("if_indextoname");
544
384
fprintf(stderr, "Binding to interface %s\n", interface);
547
memset(&to, 0, sizeof(to));
548
to.in6.sin6_family = AF_INET6;
549
/* It would be nice to have a way to detect if we were passed an
550
IPv4 address here. Now we assume an IPv6 address. */
551
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);
553
391
perror("inet_pton");
557
395
fprintf(stderr, "Bad address: %s\n", ip);
560
to.in6.sin6_port = htons(port); /* Spurious warnings from
562
-Wunreachable-code */
398
to.sin6_port = htons(port); /* Spurious warning */
564
to.in6.sin6_scope_id = (uint32_t)if_index;
400
to.sin6_scope_id = (uint32_t)if_index;
567
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
569
char addrstr[INET6_ADDRSTRLEN] = "";
570
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
571
sizeof(addrstr)) == NULL){
574
if(strcmp(addrstr, ip) != 0){
575
fprintf(stderr, "Canonical address form: %s\n", addrstr);
403
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
404
/* char addrstr[INET6_ADDRSTRLEN]; */
405
/* if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr, */
406
/* sizeof(addrstr)) == NULL){ */
407
/* perror("inet_ntop"); */
409
/* fprintf(stderr, "Really connecting to: %s, port %d\n", */
410
/* addrstr, ntohs(to.sin6_port)); */
580
ret = connect(tcp_sd, &to.in, sizeof(to));
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
582
416
perror("connect");
586
const char *out = mandos_protocol_version;
589
size_t out_size = strlen(out);
590
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
591
out_size - written));
597
written += (size_t)ret;
598
if(written < out_size){
601
if(out == mandos_protocol_version){
420
ret = initgnutls (&es);
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
611
430
fprintf(stderr, "Establishing TLS session with %s\n", ip);
614
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
617
ret = gnutls_handshake(session);
618
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
620
if(ret != GNUTLS_E_SUCCESS){
433
ret = gnutls_handshake (es.session);
435
if (ret != GNUTLS_E_SUCCESS){
622
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
437
fprintf(stderr, "\n*** Handshake failed ***\n");
629
/* Read OpenPGP packet that contains the wanted password */
444
//Retrieve OpenPGP packet that contains the wanted password
632
447
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
637
buffer_capacity = adjustbuffer(&buffer, buffer_length,
639
if(buffer_capacity == 0){
640
perror("adjustbuffer");
452
if (buffer_length + BUFFER_SIZE > buffer_capacity){
453
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
buffer_capacity += BUFFER_SIZE;
645
sret = gnutls_record_recv(session, buffer+buffer_length,
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
652
468
case GNUTLS_E_INTERRUPTED:
653
469
case GNUTLS_E_AGAIN:
655
471
case GNUTLS_E_REHANDSHAKE:
657
ret = gnutls_handshake(session);
658
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
660
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
472
ret = gnutls_handshake (es.session);
474
fprintf(stderr, "\n*** Handshake failed ***\n");
667
481
fprintf(stderr, "Unknown error while reading data from"
668
" encrypted session with Mandos server\n");
482
" encrypted session with mandos server\n");
670
gnutls_bye(session, GNUTLS_SHUT_RDWR);
484
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
674
buffer_length += (size_t) sret;
488
buffer_length += (size_t) ret;
679
fprintf(stderr, "Closing TLS session\n");
682
gnutls_bye(session, GNUTLS_SHUT_RDWR);
684
if(buffer_length > 0){
685
decrypted_buffer_size = pgp_packet_decrypt(mc, buffer,
492
if (buffer_length > 0){
493
decrypted_buffer_size = pgp_packet_decrypt(buffer,
688
if(decrypted_buffer_size >= 0){
497
if (decrypted_buffer_size >= 0){
690
498
while(written < (size_t) decrypted_buffer_size){
691
ret = (int)fwrite(decrypted_buffer + written, 1,
692
(size_t)decrypted_buffer_size - written,
499
ret = (int)fwrite (decrypted_buffer + written, 1,
500
(size_t)decrypted_buffer_size - written,
694
502
if(ret == 0 and ferror(stdout)){
696
504
fprintf(stderr, "Error writing encrypted data: %s\n",
754
567
char ip[AVAHI_ADDRESS_STR_MAX];
755
568
avahi_address_snprint(ip, sizeof(ip), address);
757
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
758
PRIdMAX ") on port %" PRIu16 "\n", name, host_name,
759
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);
761
int ret = start_mandos_communication(ip, port, interface, mc);
763
avahi_simple_poll_quit(mc->simple_poll);
573
int ret = start_mandos_communication(ip, port, interface);
767
579
avahi_s_service_resolver_free(r);
770
static void browse_callback( AvahiSServiceBrowser *b,
771
AvahiIfIndex interface,
772
AvahiProtocol protocol,
773
AvahiBrowserEvent event,
777
AVAHI_GCC_UNUSED AvahiLookupResultFlags
780
mandos_context *mc = userdata;
783
/* Called whenever a new services becomes available on the LAN or
784
is removed from the LAN */
788
case AVAHI_BROWSER_FAILURE:
790
fprintf(stderr, "(Avahi browser) %s\n",
791
avahi_strerror(avahi_server_errno(mc->server)));
792
avahi_simple_poll_quit(mc->simple_poll);
795
case AVAHI_BROWSER_NEW:
796
/* We ignore the returned Avahi resolver object. In the callback
797
function we free it. If the Avahi server is terminated before
798
the callback function is called the Avahi server will free the
801
if(!(avahi_s_service_resolver_new(mc->server, interface,
802
protocol, name, type, domain,
803
AVAHI_PROTO_INET6, 0,
804
resolve_callback, mc)))
805
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
806
name, avahi_strerror(avahi_server_errno(mc->server)));
809
case AVAHI_BROWSER_REMOVE:
812
case AVAHI_BROWSER_ALL_FOR_NOW:
813
case AVAHI_BROWSER_CACHE_EXHAUSTED:
815
fprintf(stderr, "No Mandos server found, still searching...\n");
582
static void browse_callback(
583
AvahiSServiceBrowser *b,
584
AvahiIfIndex interface,
585
AvahiProtocol protocol,
586
AvahiBrowserEvent event,
590
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
593
AvahiServer *s = userdata;
594
assert(b); /* Spurious warning */
596
/* Called whenever a new services becomes available on the LAN or
597
is removed from the LAN */
601
case AVAHI_BROWSER_FAILURE:
603
fprintf(stderr, "(Browser) %s\n",
604
avahi_strerror(avahi_server_errno(server)));
605
avahi_simple_poll_quit(simple_poll);
608
case AVAHI_BROWSER_NEW:
609
/* We ignore the returned resolver object. In the callback
610
function we free it. If the server is terminated before
611
the callback function is called the server will free
612
the resolver for us. */
614
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
616
AVAHI_PROTO_INET6, 0,
617
resolve_callback, s)))
618
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
619
avahi_strerror(avahi_server_errno(s)));
622
case AVAHI_BROWSER_REMOVE:
625
case AVAHI_BROWSER_ALL_FOR_NOW:
626
case AVAHI_BROWSER_CACHE_EXHAUSTED:
821
int main(int argc, char *argv[]){
631
/* Combines file name and path and returns the malloced new
632
string. some sane checks could/should be added */
633
static const char *combinepath(const char *first, const char *second){
634
size_t f_len = strlen(first);
635
size_t s_len = strlen(second);
636
char *tmp = malloc(f_len + s_len + 2);
641
memcpy(tmp, first, f_len);
645
memcpy(tmp + f_len + 1, second, s_len);
647
tmp[f_len + 1 + s_len] = '\0';
652
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
653
AvahiServerConfig config;
822
654
AvahiSServiceBrowser *sb = NULL;
827
int exitcode = EXIT_SUCCESS;
828
const char *interface = "eth0";
829
struct ifreq network;
657
int returncode = EXIT_SUCCESS;
658
const char *interface = NULL;
659
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
833
660
char *connect_to = NULL;
834
char tempdir[] = "/tmp/mandosXXXXXX";
835
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
836
const char *seckey = PATHDIR "/" SECKEY;
837
const char *pubkey = PATHDIR "/" PUBKEY;
839
mandos_context mc = { .simple_poll = NULL, .server = NULL,
840
.dh_bits = 1024, .priority = "SECURE256"
841
":!CTYPE-X.509:+CTYPE-OPENPGP" };
842
bool gnutls_initialized = false;
843
bool gpgme_initialized = false;
846
struct argp_option options[] = {
847
{ .name = "debug", .key = 128,
848
.doc = "Debug mode", .group = 3 },
849
{ .name = "connect", .key = 'c',
850
.arg = "ADDRESS:PORT",
851
.doc = "Connect directly to a specific Mandos server",
853
{ .name = "interface", .key = 'i',
855
.doc = "Interface that will be used to search for Mandos"
858
{ .name = "seckey", .key = 's',
860
.doc = "OpenPGP secret key file base name",
862
{ .name = "pubkey", .key = 'p',
864
.doc = "OpenPGP public key file base name",
866
{ .name = "dh-bits", .key = 129,
868
.doc = "Bit length of the prime number used in the"
869
" Diffie-Hellman key exchange",
871
{ .name = "priority", .key = 130,
873
.doc = "GnuTLS priority string for the TLS handshake",
878
error_t parse_opt(int key, char *arg,
879
struct argp_state *state) {
881
case 128: /* --debug */
884
case 'c': /* --connect */
887
case 'i': /* --interface */
890
case 's': /* --seckey */
893
case 'p': /* --pubkey */
896
case 129: /* --dh-bits */
897
ret = sscanf(arg, "%" SCNdMAX "%n", &tmpmax, &numchars);
898
if(ret < 1 or tmpmax != (typeof(mc.dh_bits))tmpmax
899
or arg[numchars] != '\0'){
900
fprintf(stderr, "Bad number of DH bits\n");
903
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
905
case 130: /* --priority */
913
return ARGP_ERR_UNKNOWN;
918
struct argp argp = { .options = options, .parser = parse_opt,
920
.doc = "Mandos client -- Get and decrypt"
921
" passwords from a Mandos server" };
922
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
923
if(ret == ARGP_ERR_UNKNOWN){
924
fprintf(stderr, "Unknown error while parsing arguments\n");
925
exitcode = EXIT_FAILURE;
930
/* If the interface is down, bring it up */
932
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
935
exitcode = EXIT_FAILURE;
938
strcpy(network.ifr_name, interface);
939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
941
perror("ioctl SIOCGIFFLAGS");
942
exitcode = EXIT_FAILURE;
945
if((network.ifr_flags & IFF_UP) == 0){
946
network.ifr_flags |= IFF_UP;
947
ret = ioctl(sd, SIOCSIFFLAGS, &network);
949
perror("ioctl SIOCSIFFLAGS");
950
exitcode = EXIT_FAILURE;
954
ret = (int)TEMP_FAILURE_RETRY(close(sd));
973
ret = init_gnutls_global(&mc, pubkey, seckey);
975
fprintf(stderr, "init_gnutls_global failed\n");
976
exitcode = EXIT_FAILURE;
979
gnutls_initialized = true;
982
if(mkdtemp(tempdir) == NULL){
988
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
989
fprintf(stderr, "init_gpgme failed\n");
990
exitcode = EXIT_FAILURE;
993
gpgme_initialized = true;
996
if_index = (AvahiIfIndex) if_nametoindex(interface);
998
fprintf(stderr, "No such interface: \"%s\"\n", interface);
663
static struct option long_options[] = {
664
{"debug", no_argument, (int *)&debug, 1},
665
{"connect", required_argument, 0, 'C'},
666
{"interface", required_argument, 0, 'i'},
667
{"certdir", required_argument, 0, 'd'},
668
{"certkey", required_argument, 0, 'c'},
669
{"certfile", required_argument, 0, 'k'},
672
int option_index = 0;
673
ret = getopt_long (argc, argv, "i:", long_options,
703
certfile = combinepath(certdir, certfile);
704
if (certfile == NULL){
705
perror("combinepath");
709
if(interface != NULL){
710
if_index = (AvahiIfIndex) if_nametoindex(interface);
712
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1002
717
if(connect_to != NULL){
1005
720
char *address = strrchr(connect_to, ':');
1006
721
if(address == NULL){
1007
722
fprintf(stderr, "No colon in address\n");
1008
exitcode = EXIT_FAILURE;
1012
ret = sscanf(address+1, "%" SCNdMAX "%n", &tmpmax, &numchars);
1013
if(ret < 1 or tmpmax != (uint16_t)tmpmax
1014
or address[numchars+1] != '\0'){
1015
fprintf(stderr, "Bad port number\n");
1016
exitcode = EXIT_FAILURE;
1019
port = (uint16_t)tmpmax;
726
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
728
perror("Bad port number");
1020
731
*address = '\0';
1021
732
address = connect_to;
1022
ret = start_mandos_communication(address, port, if_index, &mc);
733
ret = start_mandos_communication(address, port, if_index);
1024
exitcode = EXIT_FAILURE;
1026
exitcode = EXIT_SUCCESS;
741
certkey = combinepath(certdir, certkey);
742
if (certkey == NULL){
743
perror("combinepath");
1032
748
avahi_set_log_function(empty_log);
1035
/* Initialize the pseudo-RNG for Avahi */
751
/* Initialize the psuedo-RNG */
1036
752
srand((unsigned int) time(NULL));
1038
/* Allocate main Avahi loop object */
1039
mc.simple_poll = avahi_simple_poll_new();
1040
if(mc.simple_poll == NULL) {
1041
fprintf(stderr, "Avahi: Failed to create simple poll"
1043
exitcode = EXIT_FAILURE;
1048
AvahiServerConfig config;
1049
/* Do not publish any local Zeroconf records */
1050
avahi_server_config_init(&config);
1051
config.publish_hinfo = 0;
1052
config.publish_addresses = 0;
1053
config.publish_workstation = 0;
1054
config.publish_domain = 0;
1056
/* Allocate a new server */
1057
mc.server = avahi_server_new(avahi_simple_poll_get
1058
(mc.simple_poll), &config, NULL,
1061
/* Free the Avahi configuration data */
1062
avahi_server_config_free(&config);
1065
/* Check if creating the Avahi server object succeeded */
1066
if(mc.server == NULL) {
1067
fprintf(stderr, "Failed to create Avahi server: %s\n",
754
/* Allocate main loop object */
755
if (!(simple_poll = avahi_simple_poll_new())) {
756
fprintf(stderr, "Failed to create simple poll object.\n");
761
/* Do not publish any local records */
762
avahi_server_config_init(&config);
763
config.publish_hinfo = 0;
764
config.publish_addresses = 0;
765
config.publish_workstation = 0;
766
config.publish_domain = 0;
768
/* Allocate a new server */
769
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
770
&config, NULL, NULL, &error);
772
/* Free the configuration data */
773
avahi_server_config_free(&config);
775
/* Check if creating the server object succeeded */
777
fprintf(stderr, "Failed to create server: %s\n",
1068
778
avahi_strerror(error));
1069
exitcode = EXIT_FAILURE;
779
returncode = EXIT_FAILURE;
1073
/* Create the Avahi service browser */
1074
sb = avahi_s_service_browser_new(mc.server, if_index,
783
/* Create the service browser */
784
sb = avahi_s_service_browser_new(server, if_index,
1075
785
AVAHI_PROTO_INET6,
1076
786
"_mandos._tcp", NULL, 0,
1077
browse_callback, &mc);
787
browse_callback, server);
1079
789
fprintf(stderr, "Failed to create service browser: %s\n",
1080
avahi_strerror(avahi_server_errno(mc.server)));
1081
exitcode = EXIT_FAILURE;
790
avahi_strerror(avahi_server_errno(server)));
791
returncode = EXIT_FAILURE;
1085
795
/* Run the main loop */
1088
fprintf(stderr, "Starting Avahi loop search\n");
798
fprintf(stderr, "Starting avahi loop search\n");
1091
avahi_simple_poll_loop(mc.simple_poll);
801
avahi_simple_poll_loop(simple_poll);
1096
806
fprintf(stderr, "%s exiting\n", argv[0]);
1099
809
/* Cleanup things */
1101
811
avahi_s_service_browser_free(sb);
1103
if(mc.server != NULL)
1104
avahi_server_free(mc.server);
1106
if(mc.simple_poll != NULL)
1107
avahi_simple_poll_free(mc.simple_poll);
1109
if(gnutls_initialized){
1110
gnutls_certificate_free_credentials(mc.cred);
1111
gnutls_global_deinit();
1112
gnutls_dh_params_deinit(mc.dh_params);
1115
if(gpgme_initialized){
1116
gpgme_release(mc.ctx);
1119
/* Removes the temp directory used by GPGME */
1120
if(tempdir[0] != '\0'){
1122
struct dirent *direntry;
1123
d = opendir(tempdir);
1125
if(errno != ENOENT){
1130
direntry = readdir(d);
1131
if(direntry == NULL){
1134
/* Skip "." and ".." */
1135
if(direntry->d_name[0] == '.'
1136
and (direntry->d_name[1] == '\0'
1137
or (direntry->d_name[1] == '.'
1138
and direntry->d_name[2] == '\0'))){
1141
char *fullname = NULL;
1142
ret = asprintf(&fullname, "%s/%s", tempdir,
1148
ret = remove(fullname);
1150
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1157
ret = rmdir(tempdir);
1158
if(ret == -1 and errno != ENOENT){
814
avahi_server_free(server);
817
avahi_simple_poll_free(simple_poll);