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(), setsockopt(),
53
#include <sys/socket.h> /* socket(), setsockopt(),
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
67
#include <errno.h> /* perror() */
74
#define CERT_ROOT "/conf/conf.d/cryptkeyreq/"
76
#define CERTFILE CERT_ROOT "openpgp-client.txt"
77
#define KEYFILE CERT_ROOT "openpgp-client-key.txt"
108
78
#define BUFFER_SIZE 256
110
#define PATHDIR "/conf/conf.d/mandos"
111
#define SECKEY "seckey.txt"
112
#define PUBKEY "pubkey.txt"
114
81
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;
84
gnutls_session_t session;
123
85
gnutls_certificate_credentials_t cred;
124
unsigned int dh_bits;
125
86
gnutls_dh_params_t dh_params;
126
const char *priority;
90
ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
91
char **new_packet, const char *homedir){
92
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){
96
ssize_t new_packet_capacity = 0;
97
ssize_t new_packet_length = 0;
154
98
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");
101
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
197
105
gpgme_check_version(NULL);
198
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
199
if(rc != GPG_ERR_NO_ERROR){
200
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
201
gpgme_strsource(rc), gpgme_strerror(rc));
106
gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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){
108
/* Set GPGME home directory */
109
rc = gpgme_get_engine_info (&engine_info);
110
if (rc != GPG_ERR_NO_ERROR){
208
111
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
209
112
gpgme_strsource(rc), gpgme_strerror(rc));
212
115
while(engine_info != NULL){
213
116
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
214
117
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
215
engine_info->file_name, tempdir);
118
engine_info->file_name, homedir);
218
121
engine_info = engine_info->next;
220
123
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){
124
fprintf(stderr, "Could not set home dir to %s\n", homedir);
128
/* Create new GPGME data buffer from packet buffer */
129
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
130
if (rc != GPG_ERR_NO_ERROR){
262
131
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
263
132
gpgme_strsource(rc), gpgme_strerror(rc));
267
136
/* Create new empty GPGME data buffer for the plaintext */
268
137
rc = gpgme_data_new(&dh_plain);
269
if(rc != GPG_ERR_NO_ERROR){
138
if (rc != GPG_ERR_NO_ERROR){
270
139
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
271
140
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){
144
/* Create new GPGME "context" */
145
rc = gpgme_new(&ctx);
146
if (rc != GPG_ERR_NO_ERROR){
147
fprintf(stderr, "bad gpgme_new: %s: %s\n",
148
gpgme_strsource(rc), gpgme_strerror(rc));
152
/* Decrypt data from the FILE pointer to the plaintext data
154
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
155
if (rc != GPG_ERR_NO_ERROR){
280
156
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
281
157
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;
162
fprintf(stderr, "Decryption of OpenPGP packet succeeded\n");
166
gpgme_decrypt_result_t result;
167
result = gpgme_op_decrypt_result(ctx);
169
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
171
fprintf(stderr, "Unsupported algorithm: %s\n",
172
result->unsupported_algorithm);
173
fprintf(stderr, "Wrong key usage: %d\n",
174
result->wrong_key_usage);
175
if(result->file_name != NULL){
176
fprintf(stderr, "File name: %s\n", result->file_name);
178
gpgme_recipient_t recipient;
179
recipient = result->recipients;
181
while(recipient != NULL){
182
fprintf(stderr, "Public key algorithm: %s\n",
183
gpgme_pubkey_algo_name(recipient->pubkey_algo));
184
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
185
fprintf(stderr, "Secret key available: %s\n",
186
recipient->status == GPG_ERR_NO_SECKEY
188
recipient = recipient->next;
315
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
194
/* Delete the GPGME FILE pointer cryptotext data buffer */
195
gpgme_data_release(dh_crypto);
318
197
/* 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;
198
gpgme_data_seek(dh_plain, 0, SEEK_SET);
327
plaintext_capacity = adjustbuffer(plaintext,
328
(size_t)plaintext_length,
330
if(plaintext_capacity == 0){
331
perror("adjustbuffer");
332
plaintext_length = -1;
202
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
203
*new_packet = realloc(*new_packet,
204
(unsigned int)new_packet_capacity
206
if (*new_packet == NULL){
210
new_packet_capacity += BUFFER_SIZE;
336
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
213
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
338
215
/* Print the data, if any */
344
220
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);
223
new_packet_length += ret;
226
/* FIXME: check characters before printing to screen so to not print
227
terminal control characters */
229
/* fprintf(stderr, "decrypted password is: "); */
230
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
231
/* fprintf(stderr, "\n"); */
364
234
/* Delete the GPGME plaintext data buffer */
365
235
gpgme_data_release(dh_plain);
366
return plaintext_length;
236
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 */
239
static const char * safer_gnutls_strerror (int value) {
240
const char *ret = gnutls_strerror (value);
373
242
ret = "(unknown)";
377
/* GnuTLS log function callback */
378
static void debuggnutls(__attribute__((unused)) int level,
380
fprintf(stderr, "GnuTLS: %s", string);
246
void debuggnutls(__attribute__((unused)) int level,
248
fprintf(stderr, "%s", string);
383
static int init_gnutls_global(mandos_context *mc,
384
const char *pubkeyfilename,
385
const char *seckeyfilename){
251
int initgnutls(encrypted_session *es){
389
256
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));
259
if ((ret = gnutls_global_init ())
260
!= GNUTLS_E_SUCCESS) {
261
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
400
/* "Use a log level over 10 to enable all debugging options."
403
266
gnutls_global_set_log_level(11);
404
267
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();
270
/* openpgp credentials */
271
if ((ret = gnutls_certificate_allocate_credentials (&es->cred))
272
!= GNUTLS_E_SUCCESS) {
273
fprintf (stderr, "memory error: %s\n",
274
safer_gnutls_strerror(ret));
420
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
421
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
279
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
280
" and keyfile %s as GnuTLS credentials\n", CERTFILE,
425
284
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){
285
(es->cred, CERTFILE, KEYFILE, GNUTLS_OPENPGP_FMT_BASE64);
286
if (ret != GNUTLS_E_SUCCESS) {
288
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
290
ret, CERTFILE, KEYFILE);
291
fprintf(stdout, "The Error is: %s\n",
292
safer_gnutls_strerror(ret));
296
//GnuTLS server initialization
297
if ((ret = gnutls_dh_params_init (&es->dh_params))
298
!= GNUTLS_E_SUCCESS) {
299
fprintf (stderr, "Error in dh parameter initialization: %s\n",
300
safer_gnutls_strerror(ret));
304
if ((ret = gnutls_dh_params_generate2 (es->dh_params, DH_BITS))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in prime generation: %s\n",
307
safer_gnutls_strerror(ret));
311
gnutls_certificate_set_dh_params (es->cred, es->dh_params);
313
// GnuTLS session creation
314
if ((ret = gnutls_init (&es->session, GNUTLS_SERVER))
315
!= GNUTLS_E_SUCCESS){
469
316
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
470
317
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);
320
if ((ret = gnutls_priority_set_direct (es->session, "NORMAL", &err))
321
!= GNUTLS_E_SUCCESS) {
322
fprintf(stderr, "Syntax error at: %s\n", err);
323
fprintf(stderr, "GnuTLS error: %s\n",
324
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",
328
if ((ret = gnutls_credentials_set
329
(es->session, GNUTLS_CRD_CERTIFICATE, es->cred))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf(stderr, "Error setting a credentials set: %s\n",
489
332
safer_gnutls_strerror(ret));
490
gnutls_deinit(*session);
494
336
/* ignore client certificate if any. */
495
gnutls_certificate_server_set_request(*session,
337
gnutls_certificate_server_set_request (es->session,
498
gnutls_dh_set_prime_bits(*session, mc->dh_bits);
340
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){}
345
void empty_log(__attribute__((unused)) AvahiLogLevel level,
346
__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,
348
int start_mandos_communication(char *ip, uint16_t port,
349
unsigned int if_index){
513
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
351
struct sockaddr_in6 to;
352
encrypted_session es;
514
353
char *buffer = NULL;
515
354
char *decrypted_buffer;
516
355
size_t buffer_length = 0;
517
356
size_t buffer_capacity = 0;
518
357
ssize_t decrypted_buffer_size;
521
359
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
362
fprintf(stderr, "Setting up a tcp connection to %s\n", ip);
534
365
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
541
if(if_indextoname((unsigned int)if_index, interface) == NULL){
371
if(if_indextoname(if_index, interface) == NULL){
542
373
perror("if_indextoname");
545
379
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);
382
ret = setsockopt(tcp_sd, SOL_SOCKET, SO_BINDTODEVICE, interface, 5);
384
perror("setsockopt bindtodevice");
388
memset(&to,0,sizeof(to));
389
to.sin6_family = AF_INET6;
390
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
554
392
perror("inet_pton");
558
396
fprintf(stderr, "Bad address: %s\n", ip);
561
to.in6.sin6_port = htons(port); /* Spurious warnings from
563
-Wunreachable-code */
399
/* Spurious warnings for the next line, see for instance
400
<http://bugs.debian.org/488884> */
401
to.sin6_port = htons(port);
565
to.in6.sin6_scope_id = (uint32_t)if_index;
403
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);
406
fprintf(stderr, "Connection to: %s\n", ip);
581
ret = connect(tcp_sd, &to.in, sizeof(to));
409
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
583
411
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){
415
ret = initgnutls (&es);
421
gnutls_transport_set_ptr (es.session,
422
(gnutls_transport_ptr_t) tcp_sd);
612
425
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){
623
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
428
ret = gnutls_handshake (es.session);
430
if (ret != GNUTLS_E_SUCCESS){
431
fprintf(stderr, "\n*** Handshake failed ***\n");
630
/* Read OpenPGP packet that contains the wanted password */
437
//Retrieve OpenPGP packet that contains the wanted password
633
440
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
638
buffer_capacity = adjustbuffer(&buffer, buffer_length,
640
if(buffer_capacity == 0){
641
perror("adjustbuffer");
445
if (buffer_length + BUFFER_SIZE > buffer_capacity){
446
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
451
buffer_capacity += BUFFER_SIZE;
646
sret = gnutls_record_recv(session, buffer+buffer_length,
454
ret = gnutls_record_recv
455
(es.session, buffer+buffer_length, BUFFER_SIZE);
653
461
case GNUTLS_E_INTERRUPTED:
654
462
case GNUTLS_E_AGAIN:
656
464
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");
465
ret = gnutls_handshake (es.session);
467
fprintf(stderr, "\n*** Handshake failed ***\n");
668
474
fprintf(stderr, "Unknown error while reading data from"
669
" encrypted session with Mandos server\n");
475
" encrypted session with mandos server\n");
671
gnutls_bye(session, GNUTLS_SHUT_RDWR);
477
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
675
buffer_length += (size_t) sret;
481
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,
485
if (buffer_length > 0){
486
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,
490
if (decrypted_buffer_size >= 0){
491
while(decrypted_buffer_size > 0){
492
ret = fwrite (decrypted_buffer, 1, (size_t)decrypted_buffer_size,
695
494
if(ret == 0 and ferror(stdout)){
697
496
fprintf(stderr, "Error writing encrypted data: %s\n",
703
written += (size_t)ret;
502
decrypted_buffer += ret;
503
decrypted_buffer_size -= ret;
705
505
free(decrypted_buffer);
713
/* Shutdown procedure */
514
fprintf(stderr, "Closing TLS session\n");
717
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
721
gnutls_deinit(session);
518
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
521
gnutls_deinit (es.session);
522
gnutls_certificate_free_credentials (es.cred);
523
gnutls_global_deinit ();
725
static void resolve_callback(AvahiSServiceResolver *r,
726
AvahiIfIndex interface,
727
AVAHI_GCC_UNUSED AvahiProtocol protocol,
728
AvahiResolverEvent event,
732
const char *host_name,
733
const AvahiAddress *address,
735
AVAHI_GCC_UNUSED AvahiStringList *txt,
736
AVAHI_GCC_UNUSED AvahiLookupResultFlags
739
mandos_context *mc = userdata;
527
static AvahiSimplePoll *simple_poll = NULL;
528
static AvahiServer *server = NULL;
530
static void resolve_callback(
531
AvahiSServiceResolver *r,
532
AVAHI_GCC_UNUSED AvahiIfIndex interface,
533
AVAHI_GCC_UNUSED AvahiProtocol protocol,
534
AvahiResolverEvent event,
538
const char *host_name,
539
const AvahiAddress *address,
541
AVAHI_GCC_UNUSED AvahiStringList *txt,
542
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
543
AVAHI_GCC_UNUSED void* userdata) {
742
547
/* Called whenever a service has been resolved successfully or
747
552
case AVAHI_RESOLVER_FAILURE:
748
fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"
749
" of type '%s' in domain '%s': %s\n", name, type, domain,
750
avahi_strerror(avahi_server_errno(mc->server)));
553
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
554
" type '%s' in domain '%s': %s\n", name, type, domain,
555
avahi_strerror(avahi_server_errno(server)));
753
558
case AVAHI_RESOLVER_FOUND:
755
560
char ip[AVAHI_ADDRESS_STR_MAX];
756
561
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);
563
fprintf(stderr, "Mandos server found on %s (%s) on port %d\n",
564
host_name, ip, port);
762
int ret = start_mandos_communication(ip, port, interface, mc);
764
avahi_simple_poll_quit(mc->simple_poll);
566
int ret = start_mandos_communication(ip, port,
768
576
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");
579
static void browse_callback(
580
AvahiSServiceBrowser *b,
581
AvahiIfIndex interface,
582
AvahiProtocol protocol,
583
AvahiBrowserEvent event,
587
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
590
AvahiServer *s = userdata;
593
/* Called whenever a new services becomes available on the LAN or
594
is removed from the LAN */
598
case AVAHI_BROWSER_FAILURE:
600
fprintf(stderr, "(Browser) %s\n",
601
avahi_strerror(avahi_server_errno(server)));
602
avahi_simple_poll_quit(simple_poll);
605
case AVAHI_BROWSER_NEW:
606
/* We ignore the returned resolver object. In the callback
607
function we free it. If the server is terminated before
608
the callback function is called the server will free
609
the resolver for us. */
611
if (!(avahi_s_service_resolver_new(s, interface, protocol, name,
613
AVAHI_PROTO_INET6, 0,
614
resolve_callback, s)))
615
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
616
avahi_strerror(avahi_server_errno(s)));
619
case AVAHI_BROWSER_REMOVE:
622
case AVAHI_BROWSER_ALL_FOR_NOW:
623
case AVAHI_BROWSER_CACHE_EXHAUSTED:
822
int main(int argc, char *argv[]){
628
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
629
AvahiServerConfig config;
823
630
AvahiSServiceBrowser *sb = NULL;
828
int exitcode = EXIT_SUCCESS;
633
int returncode = EXIT_SUCCESS;
829
634
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;
637
static struct option long_options[] = {
638
{"debug", no_argument, (int *)&debug, 1},
639
{"interface", required_argument, 0, 'i'},
642
int option_index = 0;
643
ret = getopt_long (argc, argv, "i:", long_options,
1082
662
avahi_set_log_function(empty_log);
1085
/* Initialize the pseudo-RNG for Avahi */
665
/* Initialize the psuedo-RNG */
1086
666
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",
668
/* Allocate main loop object */
669
if (!(simple_poll = avahi_simple_poll_new())) {
670
fprintf(stderr, "Failed to create simple poll object.\n");
675
/* Do not publish any local records */
676
avahi_server_config_init(&config);
677
config.publish_hinfo = 0;
678
config.publish_addresses = 0;
679
config.publish_workstation = 0;
680
config.publish_domain = 0;
682
/* Allocate a new server */
683
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
684
&config, NULL, NULL, &error);
686
/* Free the configuration data */
687
avahi_server_config_free(&config);
689
/* Check if creating the server object succeeded */
691
fprintf(stderr, "Failed to create server: %s\n",
1118
692
avahi_strerror(error));
1119
exitcode = EXIT_FAILURE;
693
returncode = EXIT_FAILURE;
1123
/* Create the Avahi service browser */
1124
sb = avahi_s_service_browser_new(mc.server, if_index,
697
/* Create the service browser */
698
sb = avahi_s_service_browser_new(server,
700
if_nametoindex(interface),
1125
701
AVAHI_PROTO_INET6,
1126
702
"_mandos._tcp", NULL, 0,
1127
browse_callback, &mc);
703
browse_callback, server);
1129
705
fprintf(stderr, "Failed to create service browser: %s\n",
1130
avahi_strerror(avahi_server_errno(mc.server)));
1131
exitcode = EXIT_FAILURE;
706
avahi_strerror(avahi_server_errno(server)));
707
returncode = EXIT_FAILURE;
1135
711
/* Run the main loop */
1138
fprintf(stderr, "Starting Avahi loop search\n");
714
fprintf(stderr, "Starting avahi loop search\n");
717
avahi_simple_poll_loop(simple_poll);
1141
avahi_simple_poll_loop(mc.simple_poll);
1146
722
fprintf(stderr, "%s exiting\n", argv[0]);
1149
725
/* Cleanup things */
1151
727
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){
730
avahi_server_free(server);
733
avahi_simple_poll_free(simple_poll);