112
83
#include <avahi-common/error.h>
115
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
118
88
init_gnutls_session(),
120
#include <gnutls/openpgp.h>
121
/* gnutls_certificate_set_openpgp_key_file(),
122
GNUTLS_OPENPGP_FMT_BASE64 */
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
91
GNUTLS_OPENPGP_FMT_BASE64 */
125
#include <gpgme.h> /* All GPGME types, constants and
94
#include <gpgme.h> /* All GPGME types, constants and functions
128
96
GPGME_PROTOCOL_OpenPGP,
131
99
#define BUFFER_SIZE 256
133
#define PATHDIR "/conf/conf.d/mandos"
134
#define SECKEY "seckey.txt"
135
#define PUBKEY "pubkey.txt"
136
#define HOOKDIR "/lib/mandos/network-hooks.d"
138
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
139
103
static const char mandos_protocol_version[] = "1";
140
const char *argp_program_version = "mandos-client " VERSION;
141
const char *argp_program_bug_address = "<mandos@recompile.se>";
142
static const char sys_class_net[] = "/sys/class/net";
143
char *connect_to = NULL;
144
const char *hookdir = HOOKDIR;
149
/* Doubly linked list that need to be circularly linked when used */
150
typedef struct server{
153
AvahiIfIndex if_index;
155
struct timespec last_seen;
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
160
107
/* Used for passing in values through the Avahi callback functions */
109
AvahiSimplePoll *simple_poll;
162
110
AvahiServer *server;
163
111
gnutls_certificate_credentials_t cred;
164
112
unsigned int dh_bits;
165
113
gnutls_dh_params_t dh_params;
166
114
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
171
115
} mandos_context;
173
/* global so signal handler can reach it*/
174
AvahiSimplePoll *simple_poll;
176
sig_atomic_t quit_now = 0;
177
int signal_received = 0;
179
/* Function to use when printing errors */
180
void perror_plus(const char *print_text){
182
fprintf(stderr, "Mandos plugin %s: ",
183
program_invocation_short_name);
188
__attribute__((format (gnu_printf, 2, 3), nonnull))
189
int fprintf_plus(FILE *stream, const char *format, ...){
191
va_start (ap, format);
193
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
194
program_invocation_short_name));
195
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
201
120
* "buffer_length" is how much is already used.
203
__attribute__((nonnull, warn_unused_result))
204
size_t incbuffer(char **buffer, size_t buffer_length,
205
size_t buffer_capacity){
206
if(buffer_length + BUFFER_SIZE > buffer_capacity){
207
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
209
int old_errno = errno;
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
216
129
buffer_capacity += BUFFER_SIZE;
218
131
return buffer_capacity;
221
/* Add server to set of servers to retry periodically */
222
__attribute__((nonnull, warn_unused_result))
223
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
224
int af, server **current_server){
226
server *new_server = malloc(sizeof(server));
227
if(new_server == NULL){
228
perror_plus("malloc");
231
*new_server = (server){ .ip = strdup(ip),
233
.if_index = if_index,
235
if(new_server->ip == NULL){
236
perror_plus("strdup");
240
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
242
perror_plus("clock_gettime");
244
#pragma GCC diagnostic push
245
#pragma GCC diagnostic ignored "-Wcast-qual"
247
free((char *)(new_server->ip));
249
#pragma GCC diagnostic pop
254
/* Special case of first server */
255
if(*current_server == NULL){
256
new_server->next = new_server;
257
new_server->prev = new_server;
258
*current_server = new_server;
260
/* Place the new server last in the list */
261
new_server->next = *current_server;
262
new_server->prev = (*current_server)->prev;
263
new_server->prev->next = new_server;
264
(*current_server)->prev = new_server;
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
272
__attribute__((nonnull, warn_unused_result))
273
static bool init_gpgme(const char * const seckey,
274
const char * const pubkey,
275
const char * const tempdir,
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
277
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
278
148
gpgme_engine_info_t engine_info;
281
* Helper function to insert pub and seckey to the engine keyring.
283
bool import_key(const char * const filename){
286
gpgme_data_t pgp_data;
288
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
294
rc = gpgme_data_new_from_fd(&pgp_data, fd);
295
if(rc != GPG_ERR_NO_ERROR){
296
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
297
gpgme_strsource(rc), gpgme_strerror(rc));
301
rc = gpgme_op_import(mc->ctx, pgp_data);
302
if(rc != GPG_ERR_NO_ERROR){
303
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
304
gpgme_strsource(rc), gpgme_strerror(rc));
308
ret = (int)TEMP_FAILURE_RETRY(close(fd));
310
perror_plus("close");
312
gpgme_data_release(pgp_data);
317
fprintf_plus(stderr, "Initializing GPGME\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
321
155
gpgme_check_version(NULL);
322
156
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
323
if(rc != GPG_ERR_NO_ERROR){
324
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
325
gpgme_strsource(rc), gpgme_strerror(rc));
157
if (rc != GPG_ERR_NO_ERROR){
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
159
gpgme_strsource(rc), gpgme_strerror(rc));
329
163
/* Set GPGME home directory for the OpenPGP engine only */
330
rc = gpgme_get_engine_info(&engine_info);
331
if(rc != GPG_ERR_NO_ERROR){
332
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
333
gpgme_strsource(rc), gpgme_strerror(rc));
164
rc = gpgme_get_engine_info (&engine_info);
165
if (rc != GPG_ERR_NO_ERROR){
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
167
gpgme_strsource(rc), gpgme_strerror(rc));
336
170
while(engine_info != NULL){
337
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
338
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
339
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
342
176
engine_info = engine_info->next;
344
178
if(engine_info == NULL){
345
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
350
/* Create new GPGME "context" */
351
rc = gpgme_new(&(mc->ctx));
352
if(rc != GPG_ERR_NO_ERROR){
353
fprintf_plus(stderr, "Mandos plugin mandos-client: "
354
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
359
if(not import_key(pubkey) or not import_key(seckey)){
367
* Decrypt OpenPGP data.
368
* Returns -1 on error
370
__attribute__((nonnull, warn_unused_result))
371
static ssize_t pgp_packet_decrypt(const char *cryptotext,
375
gpgme_data_t dh_crypto, dh_plain;
378
size_t plaintext_capacity = 0;
379
ssize_t plaintext_length = 0;
382
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
385
183
/* Create new GPGME data buffer from memory cryptotext */
386
184
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
388
if(rc != GPG_ERR_NO_ERROR){
389
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
390
gpgme_strsource(rc), gpgme_strerror(rc));
186
if (rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
394
192
/* Create new empty GPGME data buffer for the plaintext */
395
193
rc = gpgme_data_new(&dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "Mandos plugin mandos-client: "
398
"bad gpgme_data_new: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
400
197
gpgme_data_release(dh_crypto);
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
404
210
/* Decrypt data from the cryptotext data buffer to the plaintext
406
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
407
if(rc != GPG_ERR_NO_ERROR){
408
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
409
gpgme_strsource(rc), gpgme_strerror(rc));
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
213
if (rc != GPG_ERR_NO_ERROR){
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
215
gpgme_strsource(rc), gpgme_strerror(rc));
410
216
plaintext_length = -1;
412
gpgme_decrypt_result_t result;
413
result = gpgme_op_decrypt_result(mc->ctx);
415
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
417
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
418
result->unsupported_algorithm);
419
fprintf_plus(stderr, "Wrong key usage: %u\n",
420
result->wrong_key_usage);
421
if(result->file_name != NULL){
422
fprintf_plus(stderr, "File name: %s\n", result->file_name);
424
gpgme_recipient_t recipient;
425
recipient = result->recipients;
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
426
240
while(recipient != NULL){
427
fprintf_plus(stderr, "Public key algorithm: %s\n",
428
gpgme_pubkey_algo_name
429
(recipient->pubkey_algo));
430
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
431
fprintf_plus(stderr, "Secret key available: %s\n",
432
recipient->status == GPG_ERR_NO_SECKEY
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
434
247
recipient = recipient->next;
442
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
445
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
446
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
447
perror_plus("gpgme_data_seek");
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
255
perror("pgpme_data_seek");
448
256
plaintext_length = -1;
449
257
goto decrypt_end;
452
260
*plaintext = NULL;
454
plaintext_capacity = incbuffer(plaintext,
455
(size_t)plaintext_length,
457
if(plaintext_capacity == 0){
458
perror_plus("incbuffer");
459
plaintext_length = -1;
262
plaintext_capacity = adjustbuffer(plaintext,
263
(size_t)plaintext_length,
265
if (plaintext_capacity == 0){
266
perror("adjustbuffer");
267
plaintext_length = -1;
463
271
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
465
273
/* Print the data, if any */
471
perror_plus("gpgme_data_read");
279
perror("gpgme_data_read");
472
280
plaintext_length = -1;
473
281
goto decrypt_end;
475
283
plaintext_length += ret;
479
fprintf_plus(stderr, "Decrypted password is: ");
287
fprintf(stderr, "Decrypted password is: ");
480
288
for(ssize_t i = 0; i < plaintext_length; i++){
481
289
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
651
435
__attribute__((unused)) const char *txt){}
653
437
/* Called when a Mandos server is found */
654
__attribute__((nonnull, warn_unused_result))
655
static int start_mandos_communication(const char *ip, in_port_t port,
438
static int start_mandos_communication(const char *ip, uint16_t port,
656
439
AvahiIfIndex if_index,
657
int af, mandos_context *mc){
658
int ret, tcp_sd = -1;
660
struct sockaddr_storage to;
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
661
443
char *buffer = NULL;
662
char *decrypted_buffer = NULL;
444
char *decrypted_buffer;
663
445
size_t buffer_length = 0;
664
446
size_t buffer_capacity = 0;
447
ssize_t decrypted_buffer_size;
450
char interface[IF_NAMESIZE];
667
451
gnutls_session_t session;
668
int pf; /* Protocol family */
685
fprintf_plus(stderr, "Bad address family: %d\n", af);
690
/* If the interface is specified and we have a list of interfaces */
691
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
692
/* Check if the interface is one of the interfaces we are using */
695
char *interface = NULL;
696
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
698
if(if_nametoindex(interface) == (unsigned int)if_index){
705
/* This interface does not match any in the list, so we don't
706
connect to the server */
708
char interface[IF_NAMESIZE];
709
if(if_indextoname((unsigned int)if_index, interface) == NULL){
710
perror_plus("if_indextoname");
712
fprintf_plus(stderr, "Skipping server on non-used interface"
714
if_indextoname((unsigned int)if_index,
453
ret = init_gnutls_session (mc, &session);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
463
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
470
if(if_indextoname((unsigned int)if_index, interface) == NULL){
471
perror("if_indextoname");
474
fprintf(stderr, "Binding to interface %s\n", interface);
722
ret = init_gnutls_session(&session, mc);
477
memset(&to,0,sizeof(to)); /* Spurious warning */
478
to.in6.sin6_family = AF_INET6;
479
/* It would be nice to have a way to detect if we were passed an
480
IPv4 address here. Now we assume an IPv6 address. */
481
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
728
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
729
PRIuMAX "\n", ip, (uintmax_t)port);
732
tcp_sd = socket(pf, SOCK_STREAM, 0);
735
perror_plus("socket");
745
memset(&to, 0, sizeof(to));
747
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
748
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
750
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
751
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
755
perror_plus("inet_pton");
761
fprintf_plus(stderr, "Bad address: %s\n", ip);
766
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
767
if(IN6_IS_ADDR_LINKLOCAL
768
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
769
if(if_index == AVAHI_IF_UNSPEC){
770
fprintf_plus(stderr, "An IPv6 link-local address is"
771
" incomplete without a network interface\n");
775
/* Set the network interface number as scope */
776
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
779
((struct sockaddr_in *)&to)->sin_port = htons(port);
487
fprintf(stderr, "Bad address: %s\n", ip);
490
to.in6.sin6_port = htons(port); /* Spurious warning */
492
to.in6.sin6_scope_id = (uint32_t)if_index;
788
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
789
char interface[IF_NAMESIZE];
790
if(if_indextoname((unsigned int)if_index, interface) == NULL){
791
perror_plus("if_indextoname");
793
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
794
"\n", ip, interface, (uintmax_t)port);
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
497
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
499
sizeof(addrstr)) == NULL){
502
if(strcmp(addrstr, ip) != 0){
503
fprintf(stderr, "Canonical address form: %s\n", addrstr);
797
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
798
ip, (uintmax_t)port);
800
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
801
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
803
ret = getnameinfo((struct sockaddr *)&to,
804
sizeof(struct sockaddr_in6),
805
addrstr, sizeof(addrstr), NULL, 0,
808
ret = getnameinfo((struct sockaddr *)&to,
809
sizeof(struct sockaddr_in),
810
addrstr, sizeof(addrstr), NULL, 0,
813
if(ret == EAI_SYSTEM){
814
perror_plus("getnameinfo");
815
} else if(ret != 0) {
816
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
817
} else if(strcmp(addrstr, ip) != 0){
818
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
828
ret = connect(tcp_sd, (struct sockaddr *)&to,
829
sizeof(struct sockaddr_in6));
831
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
832
sizeof(struct sockaddr_in));
835
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
837
perror_plus("connect");
508
ret = connect(tcp_sd, &to.in, sizeof(to));
848
514
const char *out = mandos_protocol_version;
851
517
size_t out_size = strlen(out);
852
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
853
out_size - written));
856
perror_plus("write");
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
860
525
written += (size_t)ret;
861
526
if(written < out_size){
864
if(out == mandos_protocol_version){
529
if (out == mandos_protocol_version){
879
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
887
/* This casting via intptr_t is to eliminate warning about casting
888
an int to a pointer type. This is exactly how the GnuTLS Guile
889
function "set-session-transport-fd!" does it. */
890
gnutls_transport_set_ptr(session,
891
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
899
ret = gnutls_handshake(session);
539
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
ret = gnutls_handshake (session);
904
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
906
if(ret != GNUTLS_E_SUCCESS){
548
if (ret != GNUTLS_E_SUCCESS){
908
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
550
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
915
557
/* Read OpenPGP packet that contains the wanted password */
918
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
560
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
929
buffer_capacity = incbuffer(&buffer, buffer_length,
931
if(buffer_capacity == 0){
933
perror_plus("incbuffer");
943
sret = gnutls_record_recv(session, buffer+buffer_length,
565
buffer_capacity = adjustbuffer(&buffer, buffer_length,
567
if (buffer_capacity == 0){
568
perror("adjustbuffer");
573
ret = gnutls_record_recv(session, buffer+buffer_length,
950
580
case GNUTLS_E_INTERRUPTED:
951
581
case GNUTLS_E_AGAIN:
953
583
case GNUTLS_E_REHANDSHAKE:
955
ret = gnutls_handshake(session);
585
ret = gnutls_handshake (session);
961
586
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
963
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
588
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
971
fprintf_plus(stderr, "Unknown error while reading data from"
972
" encrypted session with Mandos server\n");
973
gnutls_bye(session, GNUTLS_SHUT_RDWR);
595
fprintf(stderr, "Unknown error while reading data from"
596
" encrypted session with Mandos server\n");
598
gnutls_bye (session, GNUTLS_SHUT_RDWR);
978
buffer_length += (size_t) sret;
602
buffer_length += (size_t) ret;
983
fprintf_plus(stderr, "Closing TLS session\n");
992
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
997
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
999
if(buffer_length > 0){
1000
ssize_t decrypted_buffer_size;
1001
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
1002
&decrypted_buffer, mc);
1003
if(decrypted_buffer_size >= 0){
607
fprintf(stderr, "Closing TLS session\n");
610
gnutls_bye (session, GNUTLS_SHUT_RDWR);
612
if (buffer_length > 0){
613
decrypted_buffer_size = pgp_packet_decrypt(buffer,
617
if (decrypted_buffer_size >= 0){
1006
619
while(written < (size_t) decrypted_buffer_size){
1012
ret = (int)fwrite(decrypted_buffer + written, 1,
1013
(size_t)decrypted_buffer_size - written,
620
ret = (int)fwrite (decrypted_buffer + written, 1,
621
(size_t)decrypted_buffer_size - written,
1015
623
if(ret == 0 and ferror(stdout)){
1018
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
625
fprintf(stderr, "Error writing encrypted data: %s\n",
1024
631
written += (size_t)ret;
633
free(decrypted_buffer);
1030
639
/* Shutdown procedure */
1035
free(decrypted_buffer);
1038
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1044
perror_plus("close");
1046
gnutls_deinit(session);
644
gnutls_deinit (session);
1056
__attribute__((nonnull))
1057
648
static void resolve_callback(AvahiSServiceResolver *r,
1058
649
AvahiIfIndex interface,
1059
AvahiProtocol proto,
650
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1060
651
AvahiResolverEvent event,
1061
652
const char *name,
1062
653
const char *type,
1171
736
case AVAHI_BROWSER_ALL_FOR_NOW:
1172
737
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1174
fprintf_plus(stderr, "No Mandos server found, still"
739
fprintf(stderr, "No Mandos server found, still searching...\n");
1181
/* Signal handler that stops main loop after SIGTERM */
1182
static void handle_sigterm(int sig){
1187
signal_received = sig;
1188
int old_errno = errno;
1189
/* set main loop to exit */
1190
if(simple_poll != NULL){
1191
avahi_simple_poll_quit(simple_poll);
1196
__attribute__((nonnull, warn_unused_result))
1197
bool get_flags(const char *ifname, struct ifreq *ifr){
1201
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1204
perror_plus("socket");
1208
strcpy(ifr->ifr_name, ifname);
1209
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1213
perror_plus("ioctl SIOCGIFFLAGS");
1221
__attribute__((nonnull, warn_unused_result))
1222
bool good_flags(const char *ifname, const struct ifreq *ifr){
1224
/* Reject the loopback device */
1225
if(ifr->ifr_flags & IFF_LOOPBACK){
1227
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1232
/* Accept point-to-point devices only if connect_to is specified */
1233
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1235
fprintf_plus(stderr, "Accepting point-to-point interface"
1236
" \"%s\"\n", ifname);
1240
/* Otherwise, reject non-broadcast-capable devices */
1241
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1243
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1244
" \"%s\"\n", ifname);
1248
/* Reject non-ARP interfaces (including dummy interfaces) */
1249
if(ifr->ifr_flags & IFF_NOARP){
1251
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1257
/* Accept this device */
1259
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1265
* This function determines if a directory entry in /sys/class/net
1266
* corresponds to an acceptable network device.
1267
* (This function is passed to scandir(3) as a filter function.)
1269
__attribute__((nonnull, warn_unused_result))
1270
int good_interface(const struct dirent *if_entry){
1271
if(if_entry->d_name[0] == '.'){
1276
if(not get_flags(if_entry->d_name, &ifr)){
1278
fprintf_plus(stderr, "Failed to get flags for interface "
1279
"\"%s\"\n", if_entry->d_name);
1284
if(not good_flags(if_entry->d_name, &ifr)){
1291
* This function determines if a network interface is up.
1293
__attribute__((nonnull, warn_unused_result))
1294
bool interface_is_up(const char *interface){
1296
if(not get_flags(interface, &ifr)){
1298
fprintf_plus(stderr, "Failed to get flags for interface "
1299
"\"%s\"\n", interface);
1304
return (bool)(ifr.ifr_flags & IFF_UP);
1308
* This function determines if a network interface is running
1310
__attribute__((nonnull, warn_unused_result))
1311
bool interface_is_running(const char *interface){
1313
if(not get_flags(interface, &ifr)){
1315
fprintf_plus(stderr, "Failed to get flags for interface "
1316
"\"%s\"\n", interface);
1321
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1324
__attribute__((nonnull, pure, warn_unused_result))
1325
int notdotentries(const struct dirent *direntry){
1326
/* Skip "." and ".." */
1327
if(direntry->d_name[0] == '.'
1328
and (direntry->d_name[1] == '\0'
1329
or (direntry->d_name[1] == '.'
1330
and direntry->d_name[2] == '\0'))){
1336
/* Is this directory entry a runnable program? */
1337
__attribute__((nonnull, warn_unused_result))
1338
int runnable_hook(const struct dirent *direntry){
1343
if((direntry->d_name)[0] == '\0'){
1348
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1349
"abcdefghijklmnopqrstuvwxyz"
1352
if((direntry->d_name)[sret] != '\0'){
1353
/* Contains non-allowed characters */
1355
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1361
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1364
perror_plus("Could not stat hook");
1368
if(not (S_ISREG(st.st_mode))){
1369
/* Not a regular file */
1371
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1376
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1377
/* Not executable */
1379
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1385
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1391
__attribute__((nonnull, warn_unused_result))
1392
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1393
mandos_context *mc){
1395
struct timespec now;
1396
struct timespec waited_time;
1397
intmax_t block_time;
1400
if(mc->current_server == NULL){
1402
fprintf_plus(stderr, "Wait until first server is found."
1405
ret = avahi_simple_poll_iterate(s, -1);
1408
fprintf_plus(stderr, "Check current_server if we should run"
1411
/* the current time */
1412
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1414
perror_plus("clock_gettime");
1417
/* Calculating in ms how long time between now and server
1418
who we visted longest time ago. Now - last seen. */
1419
waited_time.tv_sec = (now.tv_sec
1420
- mc->current_server->last_seen.tv_sec);
1421
waited_time.tv_nsec = (now.tv_nsec
1422
- mc->current_server->last_seen.tv_nsec);
1423
/* total time is 10s/10,000ms.
1424
Converting to s from ms by dividing by 1,000,
1425
and ns to ms by dividing by 1,000,000. */
1426
block_time = ((retry_interval
1427
- ((intmax_t)waited_time.tv_sec * 1000))
1428
- ((intmax_t)waited_time.tv_nsec / 1000000));
1431
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1435
if(block_time <= 0){
1436
ret = start_mandos_communication(mc->current_server->ip,
1437
mc->current_server->port,
1438
mc->current_server->if_index,
1439
mc->current_server->af, mc);
1441
avahi_simple_poll_quit(s);
1444
ret = clock_gettime(CLOCK_MONOTONIC,
1445
&mc->current_server->last_seen);
1447
perror_plus("clock_gettime");
1450
mc->current_server = mc->current_server->next;
1451
block_time = 0; /* Call avahi to find new Mandos
1452
servers, but don't block */
1455
ret = avahi_simple_poll_iterate(s, (int)block_time);
1458
if(ret > 0 or errno != EINTR){
1459
return (ret != 1) ? ret : 0;
1465
/* Set effective uid to 0, return errno */
1466
__attribute__((warn_unused_result))
1467
error_t raise_privileges(void){
1468
error_t old_errno = errno;
1469
error_t ret_errno = 0;
1470
if(seteuid(0) == -1){
1477
/* Set effective and real user ID to 0. Return errno. */
1478
__attribute__((warn_unused_result))
1479
error_t raise_privileges_permanently(void){
1480
error_t old_errno = errno;
1481
error_t ret_errno = raise_privileges();
1486
if(setuid(0) == -1){
1493
/* Set effective user ID to unprivileged saved user ID */
1494
__attribute__((warn_unused_result))
1495
error_t lower_privileges(void){
1496
error_t old_errno = errno;
1497
error_t ret_errno = 0;
1498
if(seteuid(uid) == -1){
1505
/* Lower privileges permanently */
1506
__attribute__((warn_unused_result))
1507
error_t lower_privileges_permanently(void){
1508
error_t old_errno = errno;
1509
error_t ret_errno = 0;
1510
if(setuid(uid) == -1){
1517
__attribute__((nonnull))
1518
void run_network_hooks(const char *mode, const char *interface,
1520
struct dirent **direntries = NULL;
1521
if(hookdir_fd == -1){
1522
hookdir_fd = open(hookdir, O_RDONLY);
1523
if(hookdir_fd == -1){
1524
if(errno == ENOENT){
1526
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1527
" found\n", hookdir);
1530
perror_plus("open");
1536
#if __GLIBC_PREREQ(2, 15)
1537
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1538
runnable_hook, alphasort);
1539
#else /* not __GLIBC_PREREQ(2, 15) */
1540
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1542
#endif /* not __GLIBC_PREREQ(2, 15) */
1543
#else /* not __GLIBC__ */
1544
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1546
#endif /* not __GLIBC__ */
1548
perror_plus("scandir");
1551
struct dirent *direntry;
1553
int devnull = open("/dev/null", O_RDONLY);
1554
for(int i = 0; i < numhooks; i++){
1555
direntry = direntries[i];
1557
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1560
pid_t hook_pid = fork();
1563
/* Raise privileges */
1564
errno = raise_privileges_permanently();
1566
perror_plus("Failed to raise privileges");
1573
perror_plus("setgid");
1576
/* Reset supplementary groups */
1578
ret = setgroups(0, NULL);
1580
perror_plus("setgroups");
1583
ret = dup2(devnull, STDIN_FILENO);
1585
perror_plus("dup2(devnull, STDIN_FILENO)");
1588
ret = close(devnull);
1590
perror_plus("close");
1593
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1595
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1598
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1600
perror_plus("setenv");
1603
ret = setenv("DEVICE", interface, 1);
1605
perror_plus("setenv");
1608
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1610
perror_plus("setenv");
1613
ret = setenv("MODE", mode, 1);
1615
perror_plus("setenv");
1619
ret = asprintf(&delaystring, "%f", (double)delay);
1621
perror_plus("asprintf");
1624
ret = setenv("DELAY", delaystring, 1);
1627
perror_plus("setenv");
1631
if(connect_to != NULL){
1632
ret = setenv("CONNECT", connect_to, 1);
1634
perror_plus("setenv");
1638
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1640
perror_plus("openat");
1641
_exit(EXIT_FAILURE);
1643
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1644
perror_plus("close");
1645
_exit(EXIT_FAILURE);
1647
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1649
perror_plus("fexecve");
1650
_exit(EXIT_FAILURE);
1654
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1655
perror_plus("waitpid");
1659
if(WIFEXITED(status)){
1660
if(WEXITSTATUS(status) != 0){
1661
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1662
" with status %d\n", direntry->d_name,
1663
WEXITSTATUS(status));
1667
} else if(WIFSIGNALED(status)){
1668
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1669
" signal %d\n", direntry->d_name,
1674
fprintf_plus(stderr, "Warning: network hook \"%s\""
1675
" crashed\n", direntry->d_name);
1681
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1687
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1688
perror_plus("close");
1695
__attribute__((nonnull, warn_unused_result))
1696
error_t bring_up_interface(const char *const interface,
1698
error_t old_errno = errno;
1700
struct ifreq network;
1701
unsigned int if_index = if_nametoindex(interface);
1703
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1713
if(not interface_is_up(interface)){
1714
error_t ret_errno = 0, ioctl_errno = 0;
1715
if(not get_flags(interface, &network)){
1717
fprintf_plus(stderr, "Failed to get flags for interface "
1718
"\"%s\"\n", interface);
1722
network.ifr_flags |= IFF_UP; /* set flag */
1724
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1727
perror_plus("socket");
1733
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1735
perror_plus("close");
1742
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1746
/* Raise privileges */
1747
ret_errno = raise_privileges();
1750
perror_plus("Failed to raise privileges");
1755
bool restore_loglevel = false;
1757
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1758
messages about the network interface to mess up the prompt */
1759
ret_linux = klogctl(8, NULL, 5);
1760
if(ret_linux == -1){
1761
perror_plus("klogctl");
1763
restore_loglevel = true;
1766
#endif /* __linux__ */
1767
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1768
ioctl_errno = errno;
1770
if(restore_loglevel){
1771
ret_linux = klogctl(7, NULL, 0);
1772
if(ret_linux == -1){
1773
perror_plus("klogctl");
1776
#endif /* __linux__ */
1778
/* If raise_privileges() succeeded above */
1780
/* Lower privileges */
1781
ret_errno = lower_privileges();
1784
perror_plus("Failed to lower privileges");
1788
/* Close the socket */
1789
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1791
perror_plus("close");
1794
if(ret_setflags == -1){
1795
errno = ioctl_errno;
1796
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1801
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1805
/* Sleep checking until interface is running.
1806
Check every 0.25s, up to total time of delay */
1807
for(int i=0; i < delay * 4; i++){
1808
if(interface_is_running(interface)){
1811
struct timespec sleeptime = { .tv_nsec = 250000000 };
1812
ret = nanosleep(&sleeptime, NULL);
1813
if(ret == -1 and errno != EINTR){
1814
perror_plus("nanosleep");
1822
__attribute__((nonnull, warn_unused_result))
1823
error_t take_down_interface(const char *const interface){
1824
error_t old_errno = errno;
1825
struct ifreq network;
1826
unsigned int if_index = if_nametoindex(interface);
1828
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1832
if(interface_is_up(interface)){
1833
error_t ret_errno = 0, ioctl_errno = 0;
1834
if(not get_flags(interface, &network) and debug){
1836
fprintf_plus(stderr, "Failed to get flags for interface "
1837
"\"%s\"\n", interface);
1841
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1843
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1846
perror_plus("socket");
1852
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1856
/* Raise privileges */
1857
ret_errno = raise_privileges();
1860
perror_plus("Failed to raise privileges");
1863
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1864
ioctl_errno = errno;
1866
/* If raise_privileges() succeeded above */
1868
/* Lower privileges */
1869
ret_errno = lower_privileges();
1872
perror_plus("Failed to lower privileges");
1876
/* Close the socket */
1877
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1879
perror_plus("close");
1882
if(ret_setflags == -1){
1883
errno = ioctl_errno;
1884
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1889
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
745
/* Combines file name and path and returns the malloced new
746
string. some sane checks could/should be added */
747
static const char *combinepath(const char *first, const char *second){
748
size_t f_len = strlen(first);
749
size_t s_len = strlen(second);
750
char *tmp = malloc(f_len + s_len + 2);
755
memcpy(tmp, first, f_len); /* Spurious warning */
759
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
761
tmp[f_len + 1 + s_len] = '\0';
1897
766
int main(int argc, char *argv[]){
1898
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1899
.priority = "SECURE256:!CTYPE-X.509:"
1900
"+CTYPE-OPENPGP", .current_server = NULL,
1901
.interfaces = NULL, .interfaces_size = 0 };
1902
AvahiSServiceBrowser *sb = NULL;
1907
int exitcode = EXIT_SUCCESS;
1908
char *interfaces_to_take_down = NULL;
1909
size_t interfaces_to_take_down_size = 0;
1910
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1911
char old_tempdir[] = "/tmp/mandosXXXXXX";
1912
char *tempdir = NULL;
1913
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1914
const char *seckey = PATHDIR "/" SECKEY;
1915
const char *pubkey = PATHDIR "/" PUBKEY;
1916
char *interfaces_hooks = NULL;
1918
bool gnutls_initialized = false;
1919
bool gpgme_initialized = false;
1921
double retry_interval = 10; /* 10s between trying a server and
1922
retrying the same server again */
1924
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1925
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1930
/* Lower any group privileges we might have, just to be safe */
1934
perror_plus("setgid");
1937
/* Lower user privileges (temporarily) */
1941
perror_plus("seteuid");
1949
struct argp_option options[] = {
1950
{ .name = "debug", .key = 128,
1951
.doc = "Debug mode", .group = 3 },
1952
{ .name = "connect", .key = 'c',
1953
.arg = "ADDRESS:PORT",
1954
.doc = "Connect directly to a specific Mandos server",
1956
{ .name = "interface", .key = 'i',
1958
.doc = "Network interface that will be used to search for"
1961
{ .name = "seckey", .key = 's',
1963
.doc = "OpenPGP secret key file base name",
1965
{ .name = "pubkey", .key = 'p',
1967
.doc = "OpenPGP public key file base name",
1969
{ .name = "dh-bits", .key = 129,
1971
.doc = "Bit length of the prime number used in the"
1972
" Diffie-Hellman key exchange",
1974
{ .name = "priority", .key = 130,
1976
.doc = "GnuTLS priority string for the TLS handshake",
1978
{ .name = "delay", .key = 131,
1980
.doc = "Maximum delay to wait for interface startup",
1982
{ .name = "retry", .key = 132,
1984
.doc = "Retry interval used when denied by the Mandos server",
1986
{ .name = "network-hook-dir", .key = 133,
1988
.doc = "Directory where network hooks are located",
1991
* These reproduce what we would get without ARGP_NO_HELP
1993
{ .name = "help", .key = '?',
1994
.doc = "Give this help list", .group = -1 },
1995
{ .name = "usage", .key = -3,
1996
.doc = "Give a short usage message", .group = -1 },
1997
{ .name = "version", .key = 'V',
1998
.doc = "Print program version", .group = -1 },
2002
error_t parse_opt(int key, char *arg,
2003
struct argp_state *state){
2006
case 128: /* --debug */
2009
case 'c': /* --connect */
2012
case 'i': /* --interface */
2013
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2016
argp_error(state, "%s", strerror(ret_errno));
2019
case 's': /* --seckey */
2022
case 'p': /* --pubkey */
2025
case 129: /* --dh-bits */
2027
tmpmax = strtoimax(arg, &tmp, 10);
2028
if(errno != 0 or tmp == arg or *tmp != '\0'
2029
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2030
argp_error(state, "Bad number of DH bits");
2032
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2034
case 130: /* --priority */
2037
case 131: /* --delay */
2039
delay = strtof(arg, &tmp);
2040
if(errno != 0 or tmp == arg or *tmp != '\0'){
2041
argp_error(state, "Bad delay");
2043
case 132: /* --retry */
2045
retry_interval = strtod(arg, &tmp);
2046
if(errno != 0 or tmp == arg or *tmp != '\0'
2047
or (retry_interval * 1000) > INT_MAX
2048
or retry_interval < 0){
2049
argp_error(state, "Bad retry interval");
2052
case 133: /* --network-hook-dir */
2056
* These reproduce what we would get without ARGP_NO_HELP
2058
case '?': /* --help */
2059
argp_state_help(state, state->out_stream,
2060
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2061
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2062
case -3: /* --usage */
2063
argp_state_help(state, state->out_stream,
2064
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2065
case 'V': /* --version */
2066
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2067
exit(argp_err_exit_status);
2070
return ARGP_ERR_UNKNOWN;
2075
struct argp argp = { .options = options, .parser = parse_opt,
2077
.doc = "Mandos client -- Get and decrypt"
2078
" passwords from a Mandos server" };
2079
ret = argp_parse(&argp, argc, argv,
2080
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2087
perror_plus("argp_parse");
2088
exitcode = EX_OSERR;
2091
exitcode = EX_USAGE;
2097
/* Work around Debian bug #633582:
2098
<http://bugs.debian.org/633582> */
2100
/* Re-raise privileges */
2101
ret_errno = raise_privileges();
2104
perror_plus("Failed to raise privileges");
767
AvahiSServiceBrowser *sb = NULL;
770
int exitcode = EXIT_SUCCESS;
771
const char *interface = "eth0";
772
struct ifreq network;
776
char *connect_to = NULL;
777
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
790
.doc = "Connect directly to a sepcified mandos server",
792
{ .name = "interface", .key = 'i',
794
.doc = "Interface that Avahi will conntect through",
796
{ .name = "keydir", .key = 'd',
798
.doc = "Directory where the openpgp keyring is",
800
{ .name = "seckey", .key = 's',
802
.doc = "Secret openpgp key for gnutls authentication",
804
{ .name = "pubkey", .key = 'p',
806
.doc = "Public openpgp key for gnutls authentication",
808
{ .name = "dh-bits", .key = 129,
810
.doc = "dh-bits to use in gnutls communication",
812
{ .name = "priority", .key = 130,
814
.doc = "GNUTLS priority", .group = 1 },
2108
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2109
int seckey_fd = open(seckey, O_RDONLY);
2110
if(seckey_fd == -1){
2111
perror_plus("open");
2113
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2115
perror_plus("fstat");
2117
if(S_ISREG(st.st_mode)
2118
and st.st_uid == 0 and st.st_gid == 0){
2119
ret = fchown(seckey_fd, uid, gid);
2121
perror_plus("fchown");
2125
TEMP_FAILURE_RETRY(close(seckey_fd));
2129
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2130
int pubkey_fd = open(pubkey, O_RDONLY);
2131
if(pubkey_fd == -1){
2132
perror_plus("open");
2134
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2136
perror_plus("fstat");
2138
if(S_ISREG(st.st_mode)
2139
and st.st_uid == 0 and st.st_gid == 0){
2140
ret = fchown(pubkey_fd, uid, gid);
2142
perror_plus("fchown");
2146
TEMP_FAILURE_RETRY(close(pubkey_fd));
2150
/* Lower privileges */
2151
ret_errno = lower_privileges();
2154
perror_plus("Failed to lower privileges");
2159
/* Remove invalid interface names (except "none") */
2161
char *interface = NULL;
2162
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2164
if(strcmp(interface, "none") != 0
2165
and if_nametoindex(interface) == 0){
2166
if(interface[0] != '\0'){
2167
fprintf_plus(stderr, "Not using nonexisting interface"
2168
" \"%s\"\n", interface);
2170
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2176
/* Run network hooks */
2178
if(mc.interfaces != NULL){
2179
interfaces_hooks = malloc(mc.interfaces_size);
2180
if(interfaces_hooks == NULL){
2181
perror_plus("malloc");
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
859
return ARGP_ERR_UNKNOWN;
864
struct argp argp = { .options = options, .parser = parse_opt,
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
2184
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2185
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2187
run_network_hooks("start", interfaces_hooks != NULL ?
2188
interfaces_hooks : "", delay);
2192
avahi_set_log_function(empty_log);
2195
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2196
from the signal handler */
2197
/* Initialize the pseudo-RNG for Avahi */
2198
srand((unsigned int) time(NULL));
2199
simple_poll = avahi_simple_poll_new();
2200
if(simple_poll == NULL){
2201
fprintf_plus(stderr,
2202
"Avahi: Failed to create simple poll object.\n");
2203
exitcode = EX_UNAVAILABLE;
2207
sigemptyset(&sigterm_action.sa_mask);
2208
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2210
perror_plus("sigaddset");
2211
exitcode = EX_OSERR;
2214
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2216
perror_plus("sigaddset");
2217
exitcode = EX_OSERR;
2220
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2222
perror_plus("sigaddset");
2223
exitcode = EX_OSERR;
2226
/* Need to check if the handler is SIG_IGN before handling:
2227
| [[info:libc:Initial Signal Actions]] |
2228
| [[info:libc:Basic Signal Handling]] |
2230
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2232
perror_plus("sigaction");
2235
if(old_sigterm_action.sa_handler != SIG_IGN){
2236
ret = sigaction(SIGINT, &sigterm_action, NULL);
2238
perror_plus("sigaction");
2239
exitcode = EX_OSERR;
2243
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2245
perror_plus("sigaction");
2248
if(old_sigterm_action.sa_handler != SIG_IGN){
2249
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2251
perror_plus("sigaction");
2252
exitcode = EX_OSERR;
2256
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2258
perror_plus("sigaction");
2261
if(old_sigterm_action.sa_handler != SIG_IGN){
2262
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2264
perror_plus("sigaction");
2265
exitcode = EX_OSERR;
2270
/* If no interfaces were specified, make a list */
2271
if(mc.interfaces == NULL){
2272
struct dirent **direntries = NULL;
2273
/* Look for any good interfaces */
2274
ret = scandir(sys_class_net, &direntries, good_interface,
2277
/* Add all found interfaces to interfaces list */
2278
for(int i = 0; i < ret; ++i){
2279
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2280
direntries[i]->d_name);
2283
perror_plus("argz_add");
2284
free(direntries[i]);
2288
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2289
direntries[i]->d_name);
2291
free(direntries[i]);
2298
fprintf_plus(stderr, "Could not find a network interface\n");
876
pubkeyfile = combinepath(keydir, pubkeyfile);
877
if (pubkeyfile == NULL){
878
perror("combinepath");
2299
879
exitcode = EXIT_FAILURE;
2304
/* Bring up interfaces which are down, and remove any "none"s */
2306
char *interface = NULL;
2307
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2309
/* If interface name is "none", stop bringing up interfaces.
2310
Also remove all instances of "none" from the list */
2311
if(strcmp(interface, "none") == 0){
2312
argz_delete(&mc.interfaces, &mc.interfaces_size,
2315
while((interface = argz_next(mc.interfaces,
2316
mc.interfaces_size, interface))){
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2325
bool interface_was_up = interface_is_up(interface);
2326
errno = bring_up_interface(interface, delay);
2327
if(not interface_was_up){
2329
perror_plus("Failed to bring up interface");
2331
errno = argz_add(&interfaces_to_take_down,
2332
&interfaces_to_take_down_size,
2335
perror_plus("argz_add");
2340
if(debug and (interfaces_to_take_down == NULL)){
2341
fprintf_plus(stderr, "No interfaces were brought up\n");
2345
/* If we only got one interface, explicitly use only that one */
2346
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2348
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2351
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2358
ret = init_gnutls_global(pubkey, seckey, &mc);
2360
fprintf_plus(stderr, "init_gnutls_global failed\n");
2361
exitcode = EX_UNAVAILABLE;
2364
gnutls_initialized = true;
2371
/* Try /run/tmp before /tmp */
2372
tempdir = mkdtemp(run_tempdir);
2373
if(tempdir == NULL and errno == ENOENT){
2375
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2376
run_tempdir, old_tempdir);
2378
tempdir = mkdtemp(old_tempdir);
2380
if(tempdir == NULL){
2381
perror_plus("mkdtemp");
2389
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2390
fprintf_plus(stderr, "init_gpgme failed\n");
2391
exitcode = EX_UNAVAILABLE;
2394
gpgme_initialized = true;
2401
if(connect_to != NULL){
2402
/* Connect directly, do not use Zeroconf */
2403
/* (Mainly meant for debugging) */
2404
char *address = strrchr(connect_to, ':');
2406
if(address == NULL){
2407
fprintf_plus(stderr, "No colon in address\n");
2408
exitcode = EX_USAGE;
2418
tmpmax = strtoimax(address+1, &tmp, 10);
2419
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2420
or tmpmax != (in_port_t)tmpmax){
2421
fprintf_plus(stderr, "Bad port number\n");
2422
exitcode = EX_USAGE;
2430
port = (in_port_t)tmpmax;
2432
/* Colon in address indicates IPv6 */
2434
if(strchr(connect_to, ':') != NULL){
2436
/* Accept [] around IPv6 address - see RFC 5952 */
2437
if(connect_to[0] == '[' and address[-1] == ']')
883
seckeyfile = combinepath(keydir, seckeyfile);
884
if (seckeyfile == NULL){
885
perror("combinepath");
889
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
891
fprintf(stderr, "init_gnutls_global\n");
2445
address = connect_to;
894
gnutls_initalized = true;
910
if_index = (AvahiIfIndex) if_nametoindex(interface);
912
fprintf(stderr, "No such interface: \"%s\"\n", interface);
916
if(connect_to != NULL){
917
/* Connect directly, do not use Zeroconf */
918
/* (Mainly meant for debugging) */
919
char *address = strrchr(connect_to, ':');
921
fprintf(stderr, "No colon in address\n");
922
exitcode = EXIT_FAILURE;
926
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
928
perror("Bad port number");
929
exitcode = EXIT_FAILURE;
933
address = connect_to;
934
ret = start_mandos_communication(address, port, if_index, &mc);
936
exitcode = EXIT_FAILURE;
938
exitcode = EXIT_SUCCESS;
2451
while(not quit_now){
2452
ret = start_mandos_communication(address, port, if_index, af,
2454
if(quit_now or ret == 0){
2458
fprintf_plus(stderr, "Retrying in %d seconds\n",
2459
(int)retry_interval);
2461
sleep((unsigned int)retry_interval);
2465
exitcode = EXIT_SUCCESS;
2476
AvahiServerConfig config;
2477
/* Do not publish any local Zeroconf records */
2478
avahi_server_config_init(&config);
2479
config.publish_hinfo = 0;
2480
config.publish_addresses = 0;
2481
config.publish_workstation = 0;
2482
config.publish_domain = 0;
2484
/* Allocate a new server */
2485
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2486
&config, NULL, NULL, &ret_errno);
2488
/* Free the Avahi configuration data */
2489
avahi_server_config_free(&config);
2492
/* Check if creating the Avahi server object succeeded */
2493
if(mc.server == NULL){
2494
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2495
avahi_strerror(ret_errno));
2496
exitcode = EX_UNAVAILABLE;
2504
/* Create the Avahi service browser */
2505
sb = avahi_s_service_browser_new(mc.server, if_index,
2506
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2507
NULL, 0, browse_callback,
2510
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2511
avahi_strerror(avahi_server_errno(mc.server)));
2512
exitcode = EX_UNAVAILABLE;
2520
/* Run the main loop */
2523
fprintf_plus(stderr, "Starting Avahi loop search\n");
2526
ret = avahi_loop_with_timeout(simple_poll,
2527
(int)(retry_interval * 1000), &mc);
2529
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2530
(ret == 0) ? "successfully" : "with error");
943
/* If the interface is down, bring it up */
945
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
948
exitcode = EXIT_FAILURE;
951
strcpy(network.ifr_name, interface); /* Spurious warning */
952
ret = ioctl(sd, SIOCGIFFLAGS, &network);
954
perror("ioctl SIOCGIFFLAGS");
955
exitcode = EXIT_FAILURE;
958
if((network.ifr_flags & IFF_UP) == 0){
959
network.ifr_flags |= IFF_UP;
960
ret = ioctl(sd, SIOCSIFFLAGS, &network);
962
perror("ioctl SIOCSIFFLAGS");
963
exitcode = EXIT_FAILURE;
971
avahi_set_log_function(empty_log);
974
/* Initialize the pseudo-RNG for Avahi */
975
srand((unsigned int) time(NULL));
977
/* Allocate main Avahi loop object */
978
mc.simple_poll = avahi_simple_poll_new();
979
if (mc.simple_poll == NULL) {
980
fprintf(stderr, "Avahi: Failed to create simple poll"
982
exitcode = EXIT_FAILURE;
987
AvahiServerConfig config;
988
/* Do not publish any local Zeroconf records */
989
avahi_server_config_init(&config);
990
config.publish_hinfo = 0;
991
config.publish_addresses = 0;
992
config.publish_workstation = 0;
993
config.publish_domain = 0;
995
/* Allocate a new server */
996
mc.server = avahi_server_new(avahi_simple_poll_get
997
(mc.simple_poll), &config, NULL,
1000
/* Free the Avahi configuration data */
1001
avahi_server_config_free(&config);
1004
/* Check if creating the Avahi server object succeeded */
1005
if (mc.server == NULL) {
1006
fprintf(stderr, "Failed to create Avahi server: %s\n",
1007
avahi_strerror(error));
1008
exitcode = EXIT_FAILURE;
1012
/* Create the Avahi service browser */
1013
sb = avahi_s_service_browser_new(mc.server, if_index,
1015
"_mandos._tcp", NULL, 0,
1016
browse_callback, &mc);
1018
fprintf(stderr, "Failed to create service browser: %s\n",
1019
avahi_strerror(avahi_server_errno(mc.server)));
1020
exitcode = EXIT_FAILURE;
1024
/* Run the main loop */
1027
fprintf(stderr, "Starting Avahi loop search\n");
1030
avahi_simple_poll_loop(mc.simple_poll);
2536
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2539
/* Cleanup things */
2540
free(mc.interfaces);
2543
avahi_s_service_browser_free(sb);
2545
if(mc.server != NULL)
2546
avahi_server_free(mc.server);
2548
if(simple_poll != NULL)
2549
avahi_simple_poll_free(simple_poll);
2551
if(gnutls_initialized){
2552
gnutls_certificate_free_credentials(mc.cred);
2553
gnutls_global_deinit();
2554
gnutls_dh_params_deinit(mc.dh_params);
2557
if(gpgme_initialized){
2558
gpgme_release(mc.ctx);
2561
/* Cleans up the circular linked list of Mandos servers the client
2563
if(mc.current_server != NULL){
2564
mc.current_server->prev->next = NULL;
2565
while(mc.current_server != NULL){
2566
server *next = mc.current_server->next;
2568
#pragma GCC diagnostic push
2569
#pragma GCC diagnostic ignored "-Wcast-qual"
2571
free((char *)(mc.current_server->ip));
2573
#pragma GCC diagnostic pop
2575
free(mc.current_server);
2576
mc.current_server = next;
2580
/* Re-raise privileges */
2582
ret_errno = raise_privileges();
2585
perror_plus("Failed to raise privileges");
2588
/* Run network hooks */
2589
run_network_hooks("stop", interfaces_hooks != NULL ?
2590
interfaces_hooks : "", delay);
2592
/* Take down the network interfaces which were brought up */
2594
char *interface = NULL;
2595
while((interface=argz_next(interfaces_to_take_down,
2596
interfaces_to_take_down_size,
2598
ret_errno = take_down_interface(interface);
2601
perror_plus("Failed to take down interface");
2604
if(debug and (interfaces_to_take_down == NULL)){
2605
fprintf_plus(stderr, "No interfaces needed to be taken"
2611
ret_errno = lower_privileges_permanently();
2614
perror_plus("Failed to lower privileges permanently");
2618
free(interfaces_to_take_down);
2619
free(interfaces_hooks);
2621
/* Removes the GPGME temp directory and all files inside */
2622
if(tempdir != NULL){
2623
struct dirent **direntries = NULL;
2624
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |
2626
if(tempdir_fd == -1){
2627
perror_plus("open");
2630
#if __GLIBC_PREREQ(2, 15)
2631
int numentries = scandirat(tempdir_fd, ".", &direntries,
2632
notdotentries, alphasort);
2633
#else /* not __GLIBC_PREREQ(2, 15) */
2634
int numentries = scandir(tempdir, &direntries, notdotentries,
2636
#endif /* not __GLIBC_PREREQ(2, 15) */
2637
#else /* not __GLIBC__ */
2638
int numentries = scandir(tempdir, &direntries, notdotentries,
2640
#endif /* not __GLIBC__ */
2641
if(numentries >= 0){
2642
for(int i = 0; i < numentries; i++){
2643
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2645
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2646
" \"%s\", 0): %s\n", tempdir,
2647
direntries[i]->d_name, strerror(errno));
2649
free(direntries[i]);
2652
/* need to clean even if 0 because man page doesn't specify */
2654
if(numentries == -1){
2655
perror_plus("scandir");
2657
ret = rmdir(tempdir);
2658
if(ret == -1 and errno != ENOENT){
2659
perror_plus("rmdir");
2662
TEMP_FAILURE_RETRY(close(tempdir_fd));
2667
sigemptyset(&old_sigterm_action.sa_mask);
2668
old_sigterm_action.sa_handler = SIG_DFL;
2669
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2670
&old_sigterm_action,
2673
perror_plus("sigaction");
2676
ret = raise(signal_received);
2677
} while(ret != 0 and errno == EINTR);
2679
perror_plus("raise");
2682
TEMP_FAILURE_RETRY(pause());
1035
fprintf(stderr, "%s exiting\n", argv[0]);
1038
/* Cleanup things */
1040
avahi_s_service_browser_free(sb);
1042
if (mc.server != NULL)
1043
avahi_server_free(mc.server);
1045
if (mc.simple_poll != NULL)
1046
avahi_simple_poll_free(mc.simple_poll);
1050
if (gnutls_initalized){
1051
gnutls_certificate_free_credentials(mc.cred);
1052
gnutls_global_deinit ();