104
45
#include <avahi-common/malloc.h>
105
46
#include <avahi-common/error.h>
108
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
111
init_gnutls_session(),
113
#include <gnutls/openpgp.h>
114
/* gnutls_certificate_set_openpgp_key_file(),
115
GNUTLS_OPENPGP_FMT_BASE64 */
118
#include <gpgme.h> /* All GPGME types, constants and
121
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() */
124
69
#define BUFFER_SIZE 256
126
#define PATHDIR "/conf/conf.d/mandos"
127
#define SECKEY "seckey.txt"
128
#define PUBKEY "pubkey.txt"
129
#define HOOKDIR "/lib/mandos/network-hooks.d"
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";
131
76
bool debug = false;
132
static const char mandos_protocol_version[] = "1";
133
const char *argp_program_version = "mandos-client " VERSION;
134
const char *argp_program_bug_address = "<mandos@recompile.se>";
135
static const char sys_class_net[] = "/sys/class/net";
136
char *connect_to = NULL;
137
const char *hookdir = HOOKDIR;
139
/* Doubly linked list that need to be circularly linked when used */
140
typedef struct server{
143
AvahiIfIndex if_index;
145
struct timespec last_seen;
150
/* Used for passing in values through the Avahi callback functions */
152
AvahiSimplePoll *simple_poll;
79
gnutls_session_t session;
154
80
gnutls_certificate_credentials_t cred;
155
unsigned int dh_bits;
156
81
gnutls_dh_params_t dh_params;
157
const char *priority;
85
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
88
gpgme_data_t dh_crypto, dh_plain;
159
server *current_server;
162
/* global context so signal handler can reach it*/
163
mandos_context mc = { .simple_poll = NULL, .server = NULL,
164
.dh_bits = 1024, .priority = "SECURE256"
165
":!CTYPE-X.509:+CTYPE-OPENPGP",
166
.current_server = NULL };
168
sig_atomic_t quit_now = 0;
169
int signal_received = 0;
171
/* Function to use when printing errors */
172
void perror_plus(const char *print_text){
173
fprintf(stderr, "Mandos plugin %s: ",
174
program_invocation_short_name);
178
int fprintf_plus(FILE *stream, const char *format, ...){
180
va_start (ap, format);
182
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
183
program_invocation_short_name));
184
return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
188
* Make additional room in "buffer" for at least BUFFER_SIZE more
189
* bytes. "buffer_capacity" is how much is currently allocated,
190
* "buffer_length" is how much is already used.
192
size_t incbuffer(char **buffer, size_t buffer_length,
193
size_t buffer_capacity){
194
if(buffer_length + BUFFER_SIZE > buffer_capacity){
195
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
199
buffer_capacity += BUFFER_SIZE;
201
return buffer_capacity;
204
/* Add server to set of servers to retry periodically */
205
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
208
server *new_server = malloc(sizeof(server));
209
if(new_server == NULL){
210
perror_plus("malloc");
213
*new_server = (server){ .ip = strdup(ip),
215
.if_index = if_index,
217
if(new_server->ip == NULL){
218
perror_plus("strdup");
221
/* Special case of first server */
222
if (mc.current_server == NULL){
223
new_server->next = new_server;
224
new_server->prev = new_server;
225
mc.current_server = new_server;
226
/* Place the new server last in the list */
228
new_server->next = mc.current_server;
229
new_server->prev = mc.current_server->prev;
230
new_server->prev->next = new_server;
231
mc.current_server->prev = new_server;
233
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
235
perror_plus("clock_gettime");
244
static bool init_gpgme(const char *seckey, const char *pubkey,
245
const char *tempdir){
92
ssize_t new_packet_capacity = 0;
93
ssize_t new_packet_length = 0;
247
94
gpgme_engine_info_t engine_info;
251
* Helper function to insert pub and seckey to the engine keyring.
253
bool import_key(const char *filename){
256
gpgme_data_t pgp_data;
258
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
264
rc = gpgme_data_new_from_fd(&pgp_data, fd);
265
if(rc != GPG_ERR_NO_ERROR){
266
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
267
gpgme_strsource(rc), gpgme_strerror(rc));
271
rc = gpgme_op_import(mc.ctx, pgp_data);
272
if(rc != GPG_ERR_NO_ERROR){
273
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
274
gpgme_strsource(rc), gpgme_strerror(rc));
278
ret = (int)TEMP_FAILURE_RETRY(close(fd));
280
perror_plus("close");
282
gpgme_data_release(pgp_data);
287
fprintf_plus(stderr, "Initializing GPGME\n");
97
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
291
101
gpgme_check_version(NULL);
292
102
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
293
if(rc != GPG_ERR_NO_ERROR){
294
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
295
gpgme_strsource(rc), gpgme_strerror(rc));
103
if (rc != GPG_ERR_NO_ERROR){
104
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
105
gpgme_strsource(rc), gpgme_strerror(rc));
299
/* Set GPGME home directory for the OpenPGP engine only */
300
rc = gpgme_get_engine_info(&engine_info);
301
if(rc != GPG_ERR_NO_ERROR){
302
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
303
gpgme_strsource(rc), gpgme_strerror(rc));
109
/* Set GPGME home directory */
110
rc = gpgme_get_engine_info (&engine_info);
111
if (rc != GPG_ERR_NO_ERROR){
112
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
113
gpgme_strsource(rc), gpgme_strerror(rc));
306
116
while(engine_info != NULL){
307
117
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
308
118
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
309
engine_info->file_name, tempdir);
119
engine_info->file_name, homedir);
312
122
engine_info = engine_info->next;
314
124
if(engine_info == NULL){
315
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
320
/* Create new GPGME "context" */
321
rc = gpgme_new(&(mc.ctx));
322
if(rc != GPG_ERR_NO_ERROR){
323
fprintf_plus(stderr, "Mandos plugin mandos-client: "
324
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
329
if(not import_key(pubkey) or not import_key(seckey)){
337
* Decrypt OpenPGP data.
338
* Returns -1 on error
340
static ssize_t pgp_packet_decrypt(const char *cryptotext,
343
gpgme_data_t dh_crypto, dh_plain;
346
size_t plaintext_capacity = 0;
347
ssize_t plaintext_length = 0;
350
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
353
/* Create new GPGME data buffer from memory cryptotext */
354
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
356
if(rc != GPG_ERR_NO_ERROR){
357
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
358
gpgme_strsource(rc), gpgme_strerror(rc));
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){
132
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
133
gpgme_strsource(rc), gpgme_strerror(rc));
362
137
/* Create new empty GPGME data buffer for the plaintext */
363
138
rc = gpgme_data_new(&dh_plain);
364
if(rc != GPG_ERR_NO_ERROR){
365
fprintf_plus(stderr, "Mandos plugin mandos-client: "
366
"bad gpgme_data_new: %s: %s\n",
367
gpgme_strsource(rc), gpgme_strerror(rc));
368
gpgme_data_release(dh_crypto);
372
/* Decrypt data from the cryptotext data buffer to the plaintext
374
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
375
if(rc != GPG_ERR_NO_ERROR){
376
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
377
gpgme_strsource(rc), gpgme_strerror(rc));
378
plaintext_length = -1;
380
gpgme_decrypt_result_t result;
381
result = gpgme_op_decrypt_result(mc.ctx);
383
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
385
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
386
result->unsupported_algorithm);
387
fprintf_plus(stderr, "Wrong key usage: %u\n",
388
result->wrong_key_usage);
389
if(result->file_name != NULL){
390
fprintf_plus(stderr, "File name: %s\n", result->file_name);
392
gpgme_recipient_t recipient;
393
recipient = result->recipients;
139
if (rc != GPG_ERR_NO_ERROR){
140
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
141
gpgme_strsource(rc), gpgme_strerror(rc));
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){
157
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
158
gpgme_strsource(rc), gpgme_strerror(rc));
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;
394
182
while(recipient != NULL){
395
fprintf_plus(stderr, "Public key algorithm: %s\n",
396
gpgme_pubkey_algo_name
397
(recipient->pubkey_algo));
398
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
399
fprintf_plus(stderr, "Secret key available: %s\n",
400
recipient->status == GPG_ERR_NO_SECKEY
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
402
189
recipient = recipient->next;
410
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
195
/* Delete the GPGME FILE pointer cryptotext data buffer */
196
gpgme_data_release(dh_crypto);
413
198
/* Seek back to the beginning of the GPGME plaintext data buffer */
414
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
415
perror_plus("gpgme_data_seek");
416
plaintext_length = -1;
199
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
200
perror("pgpme_data_seek");
422
plaintext_capacity = incbuffer(plaintext,
423
(size_t)plaintext_length,
425
if(plaintext_capacity == 0){
426
perror_plus("incbuffer");
427
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;
431
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
216
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
433
218
/* Print the data, if any */
439
perror_plus("gpgme_data_read");
440
plaintext_length = -1;
443
plaintext_length += ret;
447
fprintf_plus(stderr, "Decrypted password is: ");
448
for(ssize_t i = 0; i < plaintext_length; i++){
449
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
451
fprintf(stderr, "\n");
456
/* Delete the GPGME cryptotext data buffer */
457
gpgme_data_release(dh_crypto);
223
perror("gpgme_data_read");
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"); */
459
237
/* Delete the GPGME plaintext data buffer */
460
238
gpgme_data_release(dh_plain);
461
return plaintext_length;
239
return new_packet_length;
464
static const char * safer_gnutls_strerror(int value){
465
const char *ret = gnutls_strerror(value); /* Spurious warning from
466
-Wunreachable-code */
242
static const char * safer_gnutls_strerror (int value) {
243
const char *ret = gnutls_strerror (value);
468
245
ret = "(unknown)";
472
/* GnuTLS log function callback */
473
249
static void debuggnutls(__attribute__((unused)) int level,
474
250
const char* string){
475
fprintf_plus(stderr, "GnuTLS: %s", string);
251
fprintf(stderr, "%s", string);
478
static int init_gnutls_global(const char *pubkeyfilename,
479
const char *seckeyfilename){
254
static int initgnutls(encrypted_session *es){
483
fprintf_plus(stderr, "Initializing GnuTLS\n");
259
fprintf(stderr, "Initializing GnuTLS\n");
486
ret = gnutls_global_init();
487
if(ret != GNUTLS_E_SUCCESS){
488
fprintf_plus(stderr, "GnuTLS global_init: %s\n",
489
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));
494
/* "Use a log level over 10 to enable all debugging options."
497
269
gnutls_global_set_log_level(11);
498
270
gnutls_global_set_log_function(debuggnutls);
501
/* OpenPGP credentials */
502
ret = gnutls_certificate_allocate_credentials(&mc.cred);
503
if(ret != GNUTLS_E_SUCCESS){
504
fprintf_plus(stderr, "GnuTLS memory error: %s\n",
505
safer_gnutls_strerror(ret));
506
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));
511
fprintf_plus(stderr, "Attempting to use OpenPGP public key %s and"
512
" secret key %s as GnuTLS credentials\n",
282
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
283
" and keyfile %s as GnuTLS credentials\n", certfile,
517
287
ret = gnutls_certificate_set_openpgp_key_file
518
(mc.cred, pubkeyfilename, seckeyfilename,
519
GNUTLS_OPENPGP_FMT_BASE64);
520
if(ret != GNUTLS_E_SUCCESS){
522
"Error[%d] while reading the OpenPGP key pair ('%s',"
523
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
524
fprintf_plus(stderr, "The GnuTLS error is: %s\n",
525
safer_gnutls_strerror(ret));
529
/* GnuTLS server initialization */
530
ret = gnutls_dh_params_init(&mc.dh_params);
531
if(ret != GNUTLS_E_SUCCESS){
532
fprintf_plus(stderr, "Error in GnuTLS DH parameter"
533
" initialization: %s\n",
534
safer_gnutls_strerror(ret));
537
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
538
if(ret != GNUTLS_E_SUCCESS){
539
fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",
540
safer_gnutls_strerror(ret));
544
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
550
gnutls_certificate_free_credentials(mc.cred);
551
gnutls_global_deinit();
552
gnutls_dh_params_deinit(mc.dh_params);
556
static int init_gnutls_session(gnutls_session_t *session){
558
/* GnuTLS session creation */
560
ret = gnutls_init(session, GNUTLS_SERVER);
564
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
565
if(ret != GNUTLS_E_SUCCESS){
567
"Error in GnuTLS session initialization: %s\n",
568
safer_gnutls_strerror(ret));
574
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
576
gnutls_deinit(*session);
579
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
580
if(ret != GNUTLS_E_SUCCESS){
581
fprintf_plus(stderr, "Syntax error at: %s\n", err);
582
fprintf_plus(stderr, "GnuTLS error: %s\n",
583
safer_gnutls_strerror(ret));
584
gnutls_deinit(*session);
590
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
593
gnutls_deinit(*session);
596
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
597
if(ret != GNUTLS_E_SUCCESS){
598
fprintf_plus(stderr, "Error setting GnuTLS credentials: %s\n",
599
safer_gnutls_strerror(ret));
600
gnutls_deinit(*session);
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){
319
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
320
safer_gnutls_strerror(ret));
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));
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",
335
safer_gnutls_strerror(ret));
604
339
/* ignore client certificate if any. */
605
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
340
gnutls_certificate_server_set_request (es->session,
607
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
343
gnutls_dh_set_prime_bits (es->session, DH_BITS);
612
/* Avahi log function callback */
613
348
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
614
349
__attribute__((unused)) const char *txt){}
616
/* Called when a Mandos server is found */
617
351
static int start_mandos_communication(const char *ip, uint16_t port,
618
AvahiIfIndex if_index,
620
int ret, tcp_sd = -1;
623
struct sockaddr_in in;
624
struct sockaddr_in6 in6;
352
AvahiIfIndex if_index){
354
struct sockaddr_in6 to;
355
encrypted_session es;
626
356
char *buffer = NULL;
627
char *decrypted_buffer = NULL;
357
char *decrypted_buffer;
628
358
size_t buffer_length = 0;
629
359
size_t buffer_capacity = 0;
632
gnutls_session_t session;
633
int pf; /* Protocol family */
650
fprintf_plus(stderr, "Bad address family: %d\n", af);
655
ret = init_gnutls_session(&session);
661
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
662
PRIu16 "\n", ip, port);
665
tcp_sd = socket(pf, SOCK_STREAM, 0);
668
perror_plus("socket");
678
memset(&to, 0, sizeof(to));
680
to.in6.sin6_family = (sa_family_t)af;
681
ret = inet_pton(af, ip, &to.in6.sin6_addr);
683
to.in.sin_family = (sa_family_t)af;
684
ret = inet_pton(af, ip, &to.in.sin_addr);
688
perror_plus("inet_pton");
360
ssize_t decrypted_buffer_size;
363
char interface[IF_NAMESIZE];
366
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
370
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
376
if(if_indextoname((unsigned int)if_index, interface) == NULL){
378
perror("if_indextoname");
384
fprintf(stderr, "Binding to interface %s\n", interface);
387
memset(&to,0,sizeof(to)); /* Spurious warning */
388
to.sin6_family = AF_INET6;
389
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
694
fprintf_plus(stderr, "Bad address: %s\n", ip);
699
to.in6.sin6_port = htons(port); /* Spurious warnings from
701
-Wunreachable-code */
703
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
704
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
706
if(if_index == AVAHI_IF_UNSPEC){
707
fprintf_plus(stderr, "An IPv6 link-local address is"
708
" incomplete without a network interface\n");
712
/* Set the network interface number as scope */
713
to.in6.sin6_scope_id = (uint32_t)if_index;
716
to.in.sin_port = htons(port); /* Spurious warnings from
718
-Wunreachable-code */
727
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
728
char interface[IF_NAMESIZE];
729
if(if_indextoname((unsigned int)if_index, interface) == NULL){
730
perror_plus("if_indextoname");
732
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
733
"\n", ip, interface, port);
736
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
739
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
740
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
743
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
746
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
750
perror_plus("inet_ntop");
752
if(strcmp(addrstr, ip) != 0){
753
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
764
ret = connect(tcp_sd, &to.in6, sizeof(to));
766
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
769
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
771
perror_plus("connect");
782
const char *out = mandos_protocol_version;
785
size_t out_size = strlen(out);
786
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
787
out_size - written));
790
perror_plus("write");
794
written += (size_t)ret;
795
if(written < out_size){
798
if(out == mandos_protocol_version){
813
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
821
/* Spurious warning from -Wint-to-pointer-cast */
822
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
830
ret = gnutls_handshake(session);
835
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
837
if(ret != GNUTLS_E_SUCCESS){
395
fprintf(stderr, "Bad address: %s\n", ip);
398
to.sin6_port = htons(port); /* Spurious warning */
400
to.sin6_scope_id = (uint32_t)if_index;
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)); */
414
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
420
ret = initgnutls (&es);
426
gnutls_transport_set_ptr (es.session,
427
(gnutls_transport_ptr_t) tcp_sd);
430
fprintf(stderr, "Establishing TLS session with %s\n", ip);
433
ret = gnutls_handshake (es.session);
435
if (ret != GNUTLS_E_SUCCESS){
839
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
437
fprintf(stderr, "\n*** Handshake failed ***\n");
846
/* Read OpenPGP packet that contains the wanted password */
444
//Retrieve OpenPGP packet that contains the wanted password
849
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
447
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
860
buffer_capacity = incbuffer(&buffer, buffer_length,
862
if(buffer_capacity == 0){
864
perror_plus("incbuffer");
874
sret = gnutls_record_recv(session, buffer+buffer_length,
452
if (buffer_length + BUFFER_SIZE > buffer_capacity){
453
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
458
buffer_capacity += BUFFER_SIZE;
461
ret = gnutls_record_recv
462
(es.session, buffer+buffer_length, BUFFER_SIZE);
881
468
case GNUTLS_E_INTERRUPTED:
882
469
case GNUTLS_E_AGAIN:
884
471
case GNUTLS_E_REHANDSHAKE:
886
ret = gnutls_handshake(session);
892
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
894
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
472
ret = gnutls_handshake (es.session);
474
fprintf(stderr, "\n*** Handshake failed ***\n");
902
fprintf_plus(stderr, "Unknown error while reading data from"
903
" encrypted session with Mandos server\n");
904
gnutls_bye(session, GNUTLS_SHUT_RDWR);
481
fprintf(stderr, "Unknown error while reading data from"
482
" encrypted session with mandos server\n");
484
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
909
buffer_length += (size_t) sret;
914
fprintf_plus(stderr, "Closing TLS session\n");
923
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
928
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
930
if(buffer_length > 0){
931
ssize_t decrypted_buffer_size;
932
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
934
if(decrypted_buffer_size >= 0){
488
buffer_length += (size_t) ret;
492
if (buffer_length > 0){
493
decrypted_buffer_size = pgp_packet_decrypt(buffer,
497
if (decrypted_buffer_size >= 0){
937
498
while(written < (size_t) decrypted_buffer_size){
943
ret = (int)fwrite(decrypted_buffer + written, 1,
944
(size_t)decrypted_buffer_size - written,
499
ret = (int)fwrite (decrypted_buffer + written, 1,
500
(size_t)decrypted_buffer_size - written,
946
502
if(ret == 0 and ferror(stdout)){
949
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
504
fprintf(stderr, "Error writing encrypted data: %s\n",
955
510
written += (size_t)ret;
961
/* Shutdown procedure */
966
free(decrypted_buffer);
969
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
975
perror_plus("close");
977
gnutls_deinit(session);
512
free(decrypted_buffer);
521
fprintf(stderr, "Closing TLS session\n");
525
gnutls_bye (es.session, GNUTLS_SHUT_RDWR);
528
gnutls_deinit (es.session);
529
gnutls_certificate_free_credentials (es.cred);
530
gnutls_global_deinit ();
987
static void resolve_callback(AvahiSServiceResolver *r,
988
AvahiIfIndex interface,
990
AvahiResolverEvent event,
994
const char *host_name,
995
const AvahiAddress *address,
997
AVAHI_GCC_UNUSED AvahiStringList *txt,
998
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1000
AVAHI_GCC_UNUSED void* userdata){
534
static AvahiSimplePoll *simple_poll = NULL;
535
static AvahiServer *server = NULL;
537
static void resolve_callback(
538
AvahiSServiceResolver *r,
539
AvahiIfIndex interface,
540
AVAHI_GCC_UNUSED AvahiProtocol protocol,
541
AvahiResolverEvent event,
545
const char *host_name,
546
const AvahiAddress *address,
548
AVAHI_GCC_UNUSED AvahiStringList *txt,
549
AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
550
AVAHI_GCC_UNUSED void* userdata) {
552
assert(r); /* Spurious warning */
1003
554
/* Called whenever a service has been resolved successfully or
1012
559
case AVAHI_RESOLVER_FAILURE:
1013
fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "
1014
"'%s' of type '%s' in domain '%s': %s\n", name, type,
1016
avahi_strerror(avahi_server_errno(mc.server)));
560
fprintf(stderr, "(Resolver) Failed to resolve service '%s' of"
561
" type '%s' in domain '%s': %s\n", name, type, domain,
562
avahi_strerror(avahi_server_errno(server)));
1019
565
case AVAHI_RESOLVER_FOUND:
1021
567
char ip[AVAHI_ADDRESS_STR_MAX];
1022
568
avahi_address_snprint(ip, sizeof(ip), address);
1024
fprintf_plus(stderr, "Mandos server \"%s\" found on %s (%s, %"
1025
PRIdMAX ") on port %" PRIu16 "\n", name,
1026
host_name, 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);
1028
int ret = start_mandos_communication(ip, port, interface,
1029
avahi_proto_to_af(proto));
1031
avahi_simple_poll_quit(mc.simple_poll);
1033
ret = add_server(ip, port, interface,
1034
avahi_proto_to_af(proto));
573
int ret = start_mandos_communication(ip, port, interface);
1038
579
avahi_s_service_resolver_free(r);
1041
static void browse_callback(AvahiSServiceBrowser *b,
1042
AvahiIfIndex interface,
1043
AvahiProtocol protocol,
1044
AvahiBrowserEvent event,
1048
AVAHI_GCC_UNUSED AvahiLookupResultFlags
1050
AVAHI_GCC_UNUSED void* userdata){
1053
/* Called whenever a new services becomes available on the LAN or
1054
is removed from the LAN */
1062
case AVAHI_BROWSER_FAILURE:
1064
fprintf_plus(stderr, "(Avahi browser) %s\n",
1065
avahi_strerror(avahi_server_errno(mc.server)));
1066
avahi_simple_poll_quit(mc.simple_poll);
1069
case AVAHI_BROWSER_NEW:
1070
/* We ignore the returned Avahi resolver object. In the callback
1071
function we free it. If the Avahi server is terminated before
1072
the callback function is called the Avahi server will free the
1075
if(avahi_s_service_resolver_new(mc.server, interface, protocol,
1076
name, type, domain, protocol, 0,
1077
resolve_callback, NULL) == NULL)
1078
fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"
1080
avahi_strerror(avahi_server_errno(mc.server)));
1083
case AVAHI_BROWSER_REMOVE:
1086
case AVAHI_BROWSER_ALL_FOR_NOW:
1087
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1089
fprintf_plus(stderr, "No Mandos server found, still"
1096
/* Signal handler that stops main loop after SIGTERM */
1097
static void handle_sigterm(int sig){
1102
signal_received = sig;
1103
int old_errno = errno;
1104
/* set main loop to exit */
1105
if(mc.simple_poll != NULL){
1106
avahi_simple_poll_quit(mc.simple_poll);
1111
bool get_flags(const char *ifname, struct ifreq *ifr){
1114
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1116
perror_plus("socket");
1119
strcpy(ifr->ifr_name, ifname);
1120
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1123
perror_plus("ioctl SIOCGIFFLAGS");
1130
bool good_flags(const char *ifname, const struct ifreq *ifr){
1132
/* Reject the loopback device */
1133
if(ifr->ifr_flags & IFF_LOOPBACK){
1135
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1140
/* Accept point-to-point devices only if connect_to is specified */
1141
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1143
fprintf_plus(stderr, "Accepting point-to-point interface"
1144
" \"%s\"\n", ifname);
1148
/* Otherwise, reject non-broadcast-capable devices */
1149
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1151
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1152
" \"%s\"\n", ifname);
1156
/* Reject non-ARP interfaces (including dummy interfaces) */
1157
if(ifr->ifr_flags & IFF_NOARP){
1159
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1165
/* Accept this device */
1167
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1173
* This function determines if a directory entry in /sys/class/net
1174
* corresponds to an acceptable network device.
1175
* (This function is passed to scandir(3) as a filter function.)
1177
int good_interface(const struct dirent *if_entry){
1178
if(if_entry->d_name[0] == '.'){
1183
if(not get_flags(if_entry->d_name, &ifr)){
1185
fprintf_plus(stderr, "Failed to get flags for interface "
1186
"\"%s\"\n", if_entry->d_name);
1191
if(not good_flags(if_entry->d_name, &ifr)){
1198
* This function determines if a directory entry in /sys/class/net
1199
* corresponds to an acceptable network device which is up.
1200
* (This function is passed to scandir(3) as a filter function.)
1202
int up_interface(const struct dirent *if_entry){
1203
if(if_entry->d_name[0] == '.'){
1208
if(not get_flags(if_entry->d_name, &ifr)){
1210
fprintf_plus(stderr, "Failed to get flags for interface "
1211
"\"%s\"\n", if_entry->d_name);
1216
/* Reject down interfaces */
1217
if(not (ifr.ifr_flags & IFF_UP)){
1219
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1225
/* Reject non-running interfaces */
1226
if(not (ifr.ifr_flags & IFF_RUNNING)){
1228
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1234
if(not good_flags(if_entry->d_name, &ifr)){
1240
int notdotentries(const struct dirent *direntry){
1241
/* Skip "." and ".." */
1242
if(direntry->d_name[0] == '.'
1243
and (direntry->d_name[1] == '\0'
1244
or (direntry->d_name[1] == '.'
1245
and direntry->d_name[2] == '\0'))){
1251
/* Is this directory entry a runnable program? */
1252
int runnable_hook(const struct dirent *direntry){
1257
if((direntry->d_name)[0] == '\0'){
1262
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1263
"abcdefghijklmnopqrstuvwxyz"
1266
if((direntry->d_name)[sret] != '\0'){
1267
/* Contains non-allowed characters */
1269
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1275
char *fullname = NULL;
1276
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1278
perror_plus("asprintf");
1282
ret = stat(fullname, &st);
1285
perror_plus("Could not stat hook");
1289
if(not (S_ISREG(st.st_mode))){
1290
/* Not a regular file */
1292
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1297
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1298
/* Not executable */
1300
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1306
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1312
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1314
struct timespec now;
1315
struct timespec waited_time;
1316
intmax_t block_time;
1319
if(mc.current_server == NULL){
1321
fprintf_plus(stderr, "Wait until first server is found."
1324
ret = avahi_simple_poll_iterate(s, -1);
1327
fprintf_plus(stderr, "Check current_server if we should run"
1330
/* the current time */
1331
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1333
perror_plus("clock_gettime");
1336
/* Calculating in ms how long time between now and server
1337
who we visted longest time ago. Now - last seen. */
1338
waited_time.tv_sec = (now.tv_sec
1339
- mc.current_server->last_seen.tv_sec);
1340
waited_time.tv_nsec = (now.tv_nsec
1341
- mc.current_server->last_seen.tv_nsec);
1342
/* total time is 10s/10,000ms.
1343
Converting to s from ms by dividing by 1,000,
1344
and ns to ms by dividing by 1,000,000. */
1345
block_time = ((retry_interval
1346
- ((intmax_t)waited_time.tv_sec * 1000))
1347
- ((intmax_t)waited_time.tv_nsec / 1000000));
1350
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1354
if(block_time <= 0){
1355
ret = start_mandos_communication(mc.current_server->ip,
1356
mc.current_server->port,
1357
mc.current_server->if_index,
1358
mc.current_server->af);
1360
avahi_simple_poll_quit(mc.simple_poll);
1363
ret = clock_gettime(CLOCK_MONOTONIC,
1364
&mc.current_server->last_seen);
1366
perror_plus("clock_gettime");
1369
mc.current_server = mc.current_server->next;
1370
block_time = 0; /* Call avahi to find new Mandos
1371
servers, but don't block */
1374
ret = avahi_simple_poll_iterate(s, (int)block_time);
1377
if (ret > 0 or errno != EINTR){
1378
return (ret != 1) ? ret : 0;
1384
bool run_network_hooks(const char *mode, const char *interface,
1386
struct dirent **direntries;
1387
struct dirent *direntry;
1389
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1392
perror_plus("scandir");
1394
int devnull = open("/dev/null", O_RDONLY);
1395
for(int i = 0; i < numhooks; i++){
1396
direntry = direntries[i];
1397
char *fullname = NULL;
1398
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1400
perror_plus("asprintf");
1404
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1407
pid_t hook_pid = fork();
1410
/* Raise privileges */
1414
perror_plus("seteuid");
1416
/* Raise privileges even more */
1420
perror_plus("setuid");
1426
perror_plus("setgid");
1428
/* Reset supplementary groups */
1430
ret = setgroups(0, NULL);
1432
perror_plus("setgroups");
1434
fprintf_plus(stderr, "Child: getuid() = %d\n", getuid());
1435
fprintf_plus(stderr, "Child: geteuid() = %d\n", geteuid());
1436
dup2(devnull, STDIN_FILENO);
1438
dup2(STDERR_FILENO, STDOUT_FILENO);
1439
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1441
perror_plus("setenv");
1444
ret = setenv("DEVICE", interface, 1);
1446
perror_plus("setenv");
1449
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1451
perror_plus("setenv");
1454
ret = setenv("MODE", mode, 1);
1456
perror_plus("setenv");
1460
ret = asprintf(&delaystring, "%f", delay);
1462
perror_plus("asprintf");
1465
ret = setenv("DELAY", delaystring, 1);
1468
perror_plus("setenv");
1472
ret = execl(fullname, direntry->d_name, mode, NULL);
1473
perror_plus("execl");
1476
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1477
perror_plus("waitpid");
1481
if(WIFEXITED(status)){
1482
if(WEXITSTATUS(status) != 0){
1483
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1484
" with status %d\n", direntry->d_name,
1485
WEXITSTATUS(status));
1489
} else if(WIFSIGNALED(status)){
1490
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1491
" signal %d\n", direntry->d_name,
1496
fprintf_plus(stderr, "Warning: network hook \"%s\""
1497
" crashed\n", direntry->d_name);
1504
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1513
int main(int argc, char *argv[]){
1514
AvahiSServiceBrowser *sb = NULL;
1519
int exitcode = EXIT_SUCCESS;
1520
const char *interface = "";
1521
struct ifreq network;
1523
bool take_down_interface = false;
1526
char tempdir[] = "/tmp/mandosXXXXXX";
1527
bool tempdir_created = false;
1528
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1529
const char *seckey = PATHDIR "/" SECKEY;
1530
const char *pubkey = PATHDIR "/" PUBKEY;
1532
bool gnutls_initialized = false;
1533
bool gpgme_initialized = false;
1535
double retry_interval = 10; /* 10s between trying a server and
1536
retrying the same server again */
1538
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1539
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1544
/* Lower any group privileges we might have, just to be safe */
1548
perror_plus("setgid");
1551
/* Lower user privileges (temporarily) */
1555
perror_plus("seteuid");
1563
struct argp_option options[] = {
1564
{ .name = "debug", .key = 128,
1565
.doc = "Debug mode", .group = 3 },
1566
{ .name = "connect", .key = 'c',
1567
.arg = "ADDRESS:PORT",
1568
.doc = "Connect directly to a specific Mandos server",
1570
{ .name = "interface", .key = 'i',
1572
.doc = "Network interface that will be used to search for"
1575
{ .name = "seckey", .key = 's',
1577
.doc = "OpenPGP secret key file base name",
1579
{ .name = "pubkey", .key = 'p',
1581
.doc = "OpenPGP public key file base name",
1583
{ .name = "dh-bits", .key = 129,
1585
.doc = "Bit length of the prime number used in the"
1586
" Diffie-Hellman key exchange",
1588
{ .name = "priority", .key = 130,
1590
.doc = "GnuTLS priority string for the TLS handshake",
1592
{ .name = "delay", .key = 131,
1594
.doc = "Maximum delay to wait for interface startup",
1596
{ .name = "retry", .key = 132,
1598
.doc = "Retry interval used when denied by the mandos server",
1600
{ .name = "network-hook-dir", .key = 133,
1602
.doc = "Directory where network hooks are located",
1605
* These reproduce what we would get without ARGP_NO_HELP
1607
{ .name = "help", .key = '?',
1608
.doc = "Give this help list", .group = -1 },
1609
{ .name = "usage", .key = -3,
1610
.doc = "Give a short usage message", .group = -1 },
1611
{ .name = "version", .key = 'V',
1612
.doc = "Print program version", .group = -1 },
1616
error_t parse_opt(int key, char *arg,
1617
struct argp_state *state){
1620
case 128: /* --debug */
1623
case 'c': /* --connect */
1626
case 'i': /* --interface */
1629
case 's': /* --seckey */
1632
case 'p': /* --pubkey */
1635
case 129: /* --dh-bits */
1637
tmpmax = strtoimax(arg, &tmp, 10);
1638
if(errno != 0 or tmp == arg or *tmp != '\0'
1639
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1640
argp_error(state, "Bad number of DH bits");
1642
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1644
case 130: /* --priority */
1647
case 131: /* --delay */
1649
delay = strtof(arg, &tmp);
1650
if(errno != 0 or tmp == arg or *tmp != '\0'){
1651
argp_error(state, "Bad delay");
1653
case 132: /* --retry */
1655
retry_interval = strtod(arg, &tmp);
1656
if(errno != 0 or tmp == arg or *tmp != '\0'
1657
or (retry_interval * 1000) > INT_MAX
1658
or retry_interval < 0){
1659
argp_error(state, "Bad retry interval");
1662
case 133: /* --network-hook-dir */
1666
* These reproduce what we would get without ARGP_NO_HELP
1668
case '?': /* --help */
1669
argp_state_help(state, state->out_stream,
1670
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1671
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1672
case -3: /* --usage */
1673
argp_state_help(state, state->out_stream,
1674
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1675
case 'V': /* --version */
1676
fprintf_plus(state->out_stream,
1677
"Mandos plugin mandos-client: ");
1678
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1679
exit(argp_err_exit_status);
1682
return ARGP_ERR_UNKNOWN;
1687
struct argp argp = { .options = options, .parser = parse_opt,
1689
.doc = "Mandos client -- Get and decrypt"
1690
" passwords from a Mandos server" };
1691
ret = argp_parse(&argp, argc, argv,
1692
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
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 */
1699
perror_plus("argp_parse");
1700
exitcode = EX_OSERR;
1703
exitcode = EX_USAGE;
1709
/* Work around Debian bug #633582:
1710
<http://bugs.debian.org/633582> */
1712
/* Re-raise priviliges */
1716
perror_plus("seteuid");
1720
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1721
int seckey_fd = open(seckey, O_RDONLY);
1722
if(seckey_fd == -1){
1723
perror_plus("open");
1725
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1727
perror_plus("fstat");
1729
if(S_ISREG(st.st_mode)
1730
and st.st_uid == 0 and st.st_gid == 0){
1731
ret = fchown(seckey_fd, uid, gid);
1733
perror_plus("fchown");
1737
TEMP_FAILURE_RETRY(close(seckey_fd));
1741
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1742
int pubkey_fd = open(pubkey, O_RDONLY);
1743
if(pubkey_fd == -1){
1744
perror_plus("open");
1746
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1748
perror_plus("fstat");
1750
if(S_ISREG(st.st_mode)
1751
and st.st_uid == 0 and st.st_gid == 0){
1752
ret = fchown(pubkey_fd, uid, gid);
1754
perror_plus("fchown");
1758
TEMP_FAILURE_RETRY(close(pubkey_fd));
1762
/* Lower privileges */
1766
perror_plus("seteuid");
1771
/* Run network hooks */
1772
if(not run_network_hooks("start", interface, delay)){
1777
avahi_set_log_function(empty_log);
1780
if(interface[0] == '\0'){
1781
struct dirent **direntries;
1782
/* First look for interfaces that are up */
1783
ret = scandir(sys_class_net, &direntries, up_interface,
1786
/* No up interfaces, look for any good interfaces */
1788
ret = scandir(sys_class_net, &direntries, good_interface,
1792
/* Pick the first interface returned */
1793
interface = strdup(direntries[0]->d_name);
1795
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1797
if(interface == NULL){
1798
perror_plus("malloc");
1800
exitcode = EXIT_FAILURE;
1806
fprintf_plus(stderr, "Could not find a network interface\n");
1807
exitcode = EXIT_FAILURE;
1812
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1813
from the signal handler */
1814
/* Initialize the pseudo-RNG for Avahi */
1815
srand((unsigned int) time(NULL));
1816
mc.simple_poll = avahi_simple_poll_new();
1817
if(mc.simple_poll == NULL){
1818
fprintf_plus(stderr,
1819
"Avahi: Failed to create simple poll object.\n");
1820
exitcode = EX_UNAVAILABLE;
1824
sigemptyset(&sigterm_action.sa_mask);
1825
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1827
perror_plus("sigaddset");
1828
exitcode = EX_OSERR;
1831
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1833
perror_plus("sigaddset");
1834
exitcode = EX_OSERR;
1837
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1839
perror_plus("sigaddset");
1840
exitcode = EX_OSERR;
1843
/* Need to check if the handler is SIG_IGN before handling:
1844
| [[info:libc:Initial Signal Actions]] |
1845
| [[info:libc:Basic Signal Handling]] |
1847
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1849
perror_plus("sigaction");
1852
if(old_sigterm_action.sa_handler != SIG_IGN){
1853
ret = sigaction(SIGINT, &sigterm_action, NULL);
1855
perror_plus("sigaction");
1856
exitcode = EX_OSERR;
1860
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1862
perror_plus("sigaction");
1865
if(old_sigterm_action.sa_handler != SIG_IGN){
1866
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1868
perror_plus("sigaction");
1869
exitcode = EX_OSERR;
1873
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1875
perror_plus("sigaction");
1878
if(old_sigterm_action.sa_handler != SIG_IGN){
1879
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1881
perror_plus("sigaction");
1882
exitcode = EX_OSERR;
1887
/* If the interface is down, bring it up */
1888
if(strcmp(interface, "none") != 0){
1889
if_index = (AvahiIfIndex) if_nametoindex(interface);
1891
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1892
exitcode = EX_UNAVAILABLE;
1900
/* Re-raise priviliges */
1904
perror_plus("seteuid");
1908
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1909
messages about the network interface to mess up the prompt */
1910
ret = klogctl(8, NULL, 5);
1911
bool restore_loglevel = true;
1913
restore_loglevel = false;
1914
perror_plus("klogctl");
1916
#endif /* __linux__ */
1918
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1920
perror_plus("socket");
1921
exitcode = EX_OSERR;
1923
if(restore_loglevel){
1924
ret = klogctl(7, NULL, 0);
1926
perror_plus("klogctl");
1929
#endif /* __linux__ */
1930
/* Lower privileges */
1934
perror_plus("seteuid");
1938
strcpy(network.ifr_name, interface);
1939
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1941
perror_plus("ioctl SIOCGIFFLAGS");
1943
if(restore_loglevel){
1944
ret = klogctl(7, NULL, 0);
1946
perror_plus("klogctl");
1949
#endif /* __linux__ */
1950
exitcode = EX_OSERR;
1951
/* Lower privileges */
1955
perror_plus("seteuid");
1959
if((network.ifr_flags & IFF_UP) == 0){
1960
network.ifr_flags |= IFF_UP;
1961
take_down_interface = true;
1962
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1964
take_down_interface = false;
1965
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1966
exitcode = EX_OSERR;
1968
if(restore_loglevel){
1969
ret = klogctl(7, NULL, 0);
1971
perror_plus("klogctl");
1974
#endif /* __linux__ */
1975
/* Lower privileges */
1979
perror_plus("seteuid");
1984
/* Sleep checking until interface is running.
1985
Check every 0.25s, up to total time of delay */
1986
for(int i=0; i < delay * 4; i++){
1987
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1989
perror_plus("ioctl SIOCGIFFLAGS");
1990
} else if(network.ifr_flags & IFF_RUNNING){
1993
struct timespec sleeptime = { .tv_nsec = 250000000 };
1994
ret = nanosleep(&sleeptime, NULL);
1995
if(ret == -1 and errno != EINTR){
1996
perror_plus("nanosleep");
1999
if(not take_down_interface){
2000
/* We won't need the socket anymore */
2001
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2003
perror_plus("close");
2007
if(restore_loglevel){
2008
/* Restores kernel loglevel to default */
2009
ret = klogctl(7, NULL, 0);
2011
perror_plus("klogctl");
2014
#endif /* __linux__ */
2015
/* Lower privileges */
2017
/* Lower privileges */
2020
perror_plus("seteuid");
2028
ret = init_gnutls_global(pubkey, seckey);
2030
fprintf_plus(stderr, "init_gnutls_global failed\n");
2031
exitcode = EX_UNAVAILABLE;
2034
gnutls_initialized = true;
2041
if(mkdtemp(tempdir) == NULL){
2042
perror_plus("mkdtemp");
2045
tempdir_created = true;
2051
if(not init_gpgme(pubkey, seckey, tempdir)){
2052
fprintf_plus(stderr, "init_gpgme failed\n");
2053
exitcode = EX_UNAVAILABLE;
2056
gpgme_initialized = true;
2063
if(connect_to != NULL){
2064
/* Connect directly, do not use Zeroconf */
2065
/* (Mainly meant for debugging) */
2066
char *address = strrchr(connect_to, ':');
2067
if(address == NULL){
2068
fprintf_plus(stderr, "No colon in address\n");
2069
exitcode = EX_USAGE;
2079
tmpmax = strtoimax(address+1, &tmp, 10);
2080
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2081
or tmpmax != (uint16_t)tmpmax){
2082
fprintf_plus(stderr, "Bad port number\n");
2083
exitcode = EX_USAGE;
2091
port = (uint16_t)tmpmax;
2093
/* Colon in address indicates IPv6 */
2095
if(strchr(connect_to, ':') != NULL){
2097
/* Accept [] around IPv6 address - see RFC 5952 */
2098
if(connect_to[0] == '[' and address[-1] == ']')
2106
address = connect_to;
2112
while(not quit_now){
2113
ret = start_mandos_communication(address, port, if_index, af);
2114
if(quit_now or ret == 0){
2118
fprintf_plus(stderr, "Retrying in %d seconds\n",
2119
(int)retry_interval);
2121
sleep((int)retry_interval);
2125
exitcode = EXIT_SUCCESS;
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:
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[]) {
2136
653
AvahiServerConfig config;
2137
/* Do not publish any local Zeroconf records */
654
AvahiSServiceBrowser *sb = NULL;
657
int returncode = EXIT_SUCCESS;
658
const char *interface = NULL;
659
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
660
char *connect_to = NULL;
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);
717
if(connect_to != NULL){
718
/* Connect directly, do not use Zeroconf */
719
/* (Mainly meant for debugging) */
720
char *address = strrchr(connect_to, ':');
722
fprintf(stderr, "No colon in address\n");
726
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
728
perror("Bad port number");
732
address = connect_to;
733
ret = start_mandos_communication(address, port, if_index);
741
certkey = combinepath(certdir, certkey);
742
if (certkey == NULL){
743
perror("combinepath");
748
avahi_set_log_function(empty_log);
751
/* Initialize the psuedo-RNG */
752
srand((unsigned int) time(NULL));
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 */
2138
762
avahi_server_config_init(&config);
2139
763
config.publish_hinfo = 0;
2140
764
config.publish_addresses = 0;
2141
765
config.publish_workstation = 0;
2142
766
config.publish_domain = 0;
2144
768
/* Allocate a new server */
2145
mc.server = avahi_server_new(avahi_simple_poll_get
2146
(mc.simple_poll), &config, NULL,
2149
/* Free the Avahi configuration data */
769
server = avahi_server_new(avahi_simple_poll_get(simple_poll),
770
&config, NULL, NULL, &error);
772
/* Free the configuration data */
2150
773
avahi_server_config_free(&config);
2153
/* Check if creating the Avahi server object succeeded */
2154
if(mc.server == NULL){
2155
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2156
avahi_strerror(error));
2157
exitcode = EX_UNAVAILABLE;
2165
/* Create the Avahi service browser */
2166
sb = avahi_s_service_browser_new(mc.server, if_index,
2167
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2168
NULL, 0, browse_callback, NULL);
2170
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2171
avahi_strerror(avahi_server_errno(mc.server)));
2172
exitcode = EX_UNAVAILABLE;
2180
/* Run the main loop */
2183
fprintf_plus(stderr, "Starting Avahi loop search\n");
2186
ret = avahi_loop_with_timeout(mc.simple_poll,
2187
(int)(retry_interval * 1000));
2189
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2190
(ret == 0) ? "successfully" : "with error");
2196
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2199
/* Cleanup things */
2201
avahi_s_service_browser_free(sb);
2203
if(mc.server != NULL)
2204
avahi_server_free(mc.server);
2206
if(mc.simple_poll != NULL)
2207
avahi_simple_poll_free(mc.simple_poll);
2209
if(gnutls_initialized){
2210
gnutls_certificate_free_credentials(mc.cred);
2211
gnutls_global_deinit();
2212
gnutls_dh_params_deinit(mc.dh_params);
2215
if(gpgme_initialized){
2216
gpgme_release(mc.ctx);
2219
/* Cleans up the circular linked list of Mandos servers the client
2221
if(mc.current_server != NULL){
2222
mc.current_server->prev->next = NULL;
2223
while(mc.current_server != NULL){
2224
server *next = mc.current_server->next;
2225
free(mc.current_server);
2226
mc.current_server = next;
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2233
/* Re-raise priviliges */
2238
perror_plus("seteuid");
2241
/* Take down the network interface */
2242
if(take_down_interface and geteuid() == 0){
2243
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2245
perror_plus("ioctl SIOCGIFFLAGS");
2246
} else if(network.ifr_flags & IFF_UP){
2247
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2248
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2250
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2253
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2255
perror_plus("close");
2259
/* Lower privileges permanently */
2263
perror_plus("setuid");
2266
/* Removes the GPGME temp directory and all files inside */
2267
if(tempdir_created){
2268
struct dirent **direntries = NULL;
2269
struct dirent *direntry = NULL;
2270
int numentries = scandir(tempdir, &direntries, notdotentries,
2272
if (numentries > 0){
2273
for(int i = 0; i < numentries; i++){
2274
direntry = direntries[i];
2275
char *fullname = NULL;
2276
ret = asprintf(&fullname, "%s/%s", tempdir,
2279
perror_plus("asprintf");
2282
ret = remove(fullname);
2284
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2291
/* need to clean even if 0 because man page doesn't specify */
2293
if (numentries == -1){
2294
perror_plus("scandir");
2296
ret = rmdir(tempdir);
2297
if(ret == -1 and errno != ENOENT){
2298
perror_plus("rmdir");
2303
sigemptyset(&old_sigterm_action.sa_mask);
2304
old_sigterm_action.sa_handler = SIG_DFL;
2305
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2306
&old_sigterm_action,
2309
perror_plus("sigaction");
2312
ret = raise(signal_received);
2313
} while(ret != 0 and errno == EINTR);
2315
perror_plus("raise");
2318
TEMP_FAILURE_RETRY(pause());
775
/* Check if creating the server object succeeded */
777
fprintf(stderr, "Failed to create server: %s\n",
778
avahi_strerror(error));
779
returncode = EXIT_FAILURE;
783
/* Create the service browser */
784
sb = avahi_s_service_browser_new(server, if_index,
786
"_mandos._tcp", NULL, 0,
787
browse_callback, server);
789
fprintf(stderr, "Failed to create service browser: %s\n",
790
avahi_strerror(avahi_server_errno(server)));
791
returncode = EXIT_FAILURE;
795
/* Run the main loop */
798
fprintf(stderr, "Starting avahi loop search\n");
801
avahi_simple_poll_loop(simple_poll);
806
fprintf(stderr, "%s exiting\n", argv[0]);
811
avahi_s_service_browser_free(sb);
814
avahi_server_free(server);
817
avahi_simple_poll_free(simple_poll);