111
81
#include <avahi-common/error.h>
114
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
117
86
init_gnutls_session(),
119
#include <gnutls/openpgp.h>
120
/* gnutls_certificate_set_openpgp_key_file(),
121
GNUTLS_OPENPGP_FMT_BASE64 */
88
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
89
GNUTLS_OPENPGP_FMT_BASE64 */
124
#include <gpgme.h> /* All GPGME types, constants and
92
#include <gpgme.h> /* All GPGME types, constants and functions
127
94
GPGME_PROTOCOL_OpenPGP,
130
97
#define BUFFER_SIZE 256
132
#define PATHDIR "/conf/conf.d/mandos"
133
#define SECKEY "seckey.txt"
134
#define PUBKEY "pubkey.txt"
135
#define HOOKDIR "/lib/mandos/network-hooks.d"
137
99
bool debug = false;
100
static const char *keydir = "/conf/conf.d/mandos";
138
101
static const char mandos_protocol_version[] = "1";
139
const char *argp_program_version = "mandos-client " VERSION;
140
const char *argp_program_bug_address = "<mandos@recompile.se>";
141
static const char sys_class_net[] = "/sys/class/net";
142
char *connect_to = NULL;
143
const char *hookdir = HOOKDIR;
147
/* Doubly linked list that need to be circularly linked when used */
148
typedef struct server{
151
AvahiIfIndex if_index;
153
struct timespec last_seen;
102
const char *argp_program_version = "password-request 1.0";
103
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
158
105
/* Used for passing in values through the Avahi callback functions */
107
AvahiSimplePoll *simple_poll;
160
108
AvahiServer *server;
161
109
gnutls_certificate_credentials_t cred;
162
110
unsigned int dh_bits;
163
111
gnutls_dh_params_t dh_params;
164
112
const char *priority;
166
server *current_server;
168
size_t interfaces_size;
169
113
} mandos_context;
171
/* global so signal handler can reach it*/
172
AvahiSimplePoll *simple_poll;
174
sig_atomic_t quit_now = 0;
175
int signal_received = 0;
177
/* Function to use when printing errors */
178
void perror_plus(const char *print_text){
180
fprintf(stderr, "Mandos plugin %s: ",
181
program_invocation_short_name);
186
__attribute__((format (gnu_printf, 2, 3)))
187
int fprintf_plus(FILE *stream, const char *format, ...){
189
va_start (ap, format);
191
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
192
program_invocation_short_name));
193
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
197
* Make additional room in "buffer" for at least BUFFER_SIZE more
198
* bytes. "buffer_capacity" is how much is currently allocated,
116
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
117
* "buffer_capacity" is how much is currently allocated,
199
118
* "buffer_length" is how much is already used.
201
size_t incbuffer(char **buffer, size_t buffer_length,
202
size_t buffer_capacity){
203
if(buffer_length + BUFFER_SIZE > buffer_capacity){
204
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
206
int old_errno = errno;
120
size_t adjustbuffer(char **buffer, size_t buffer_length,
121
size_t buffer_capacity){
122
if (buffer_length + BUFFER_SIZE > buffer_capacity){
123
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
213
127
buffer_capacity += BUFFER_SIZE;
215
129
return buffer_capacity;
218
/* Add server to set of servers to retry periodically */
219
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
220
int af, server **current_server){
222
server *new_server = malloc(sizeof(server));
223
if(new_server == NULL){
224
perror_plus("malloc");
227
*new_server = (server){ .ip = strdup(ip),
229
.if_index = if_index,
231
if(new_server->ip == NULL){
232
perror_plus("strdup");
235
/* Special case of first server */
236
if(*current_server == NULL){
237
new_server->next = new_server;
238
new_server->prev = new_server;
239
*current_server = new_server;
240
/* Place the new server last in the list */
242
new_server->next = *current_server;
243
new_server->prev = (*current_server)->prev;
244
new_server->prev->next = new_server;
245
(*current_server)->prev = new_server;
247
ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);
249
perror_plus("clock_gettime");
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
258
static bool init_gpgme(const char *seckey, const char *pubkey,
259
const char *tempdir, mandos_context *mc){
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
260
142
gpgme_error_t rc;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
261
146
gpgme_engine_info_t engine_info;
264
* Helper function to insert pub and seckey to the engine keyring.
266
bool import_key(const char *filename){
269
gpgme_data_t pgp_data;
271
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
277
rc = gpgme_data_new_from_fd(&pgp_data, fd);
278
if(rc != GPG_ERR_NO_ERROR){
279
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
280
gpgme_strsource(rc), gpgme_strerror(rc));
284
rc = gpgme_op_import(mc->ctx, pgp_data);
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
291
ret = (int)TEMP_FAILURE_RETRY(close(fd));
293
perror_plus("close");
295
gpgme_data_release(pgp_data);
300
fprintf_plus(stderr, "Initializing GPGME\n");
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
304
153
gpgme_check_version(NULL);
305
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
306
if(rc != GPG_ERR_NO_ERROR){
307
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
308
gpgme_strsource(rc), gpgme_strerror(rc));
155
if (rc != GPG_ERR_NO_ERROR){
156
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
157
gpgme_strsource(rc), gpgme_strerror(rc));
312
161
/* Set GPGME home directory for the OpenPGP engine only */
313
rc = gpgme_get_engine_info(&engine_info);
314
if(rc != GPG_ERR_NO_ERROR){
315
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
316
gpgme_strsource(rc), gpgme_strerror(rc));
162
rc = gpgme_get_engine_info (&engine_info);
163
if (rc != GPG_ERR_NO_ERROR){
164
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
165
gpgme_strsource(rc), gpgme_strerror(rc));
319
168
while(engine_info != NULL){
320
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
321
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
322
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
325
174
engine_info = engine_info->next;
327
176
if(engine_info == NULL){
328
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
333
/* Create new GPGME "context" */
334
rc = gpgme_new(&(mc->ctx));
335
if(rc != GPG_ERR_NO_ERROR){
336
fprintf_plus(stderr, "Mandos plugin mandos-client: "
337
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
342
if(not import_key(pubkey) or not import_key(seckey)){
350
* Decrypt OpenPGP data.
351
* Returns -1 on error
353
static ssize_t pgp_packet_decrypt(const char *cryptotext,
357
gpgme_data_t dh_crypto, dh_plain;
360
size_t plaintext_capacity = 0;
361
ssize_t plaintext_length = 0;
364
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
367
181
/* Create new GPGME data buffer from memory cryptotext */
368
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
370
if(rc != GPG_ERR_NO_ERROR){
371
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
372
gpgme_strsource(rc), gpgme_strerror(rc));
184
if (rc != GPG_ERR_NO_ERROR){
185
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
186
gpgme_strsource(rc), gpgme_strerror(rc));
376
190
/* Create new empty GPGME data buffer for the plaintext */
377
191
rc = gpgme_data_new(&dh_plain);
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "Mandos plugin mandos-client: "
380
"bad gpgme_data_new: %s: %s\n",
381
gpgme_strsource(rc), gpgme_strerror(rc));
192
if (rc != GPG_ERR_NO_ERROR){
193
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
194
gpgme_strsource(rc), gpgme_strerror(rc));
382
195
gpgme_data_release(dh_crypto);
199
/* Create new GPGME "context" */
200
rc = gpgme_new(&ctx);
201
if (rc != GPG_ERR_NO_ERROR){
202
fprintf(stderr, "bad gpgme_new: %s: %s\n",
203
gpgme_strsource(rc), gpgme_strerror(rc));
204
plaintext_length = -1;
386
208
/* Decrypt data from the cryptotext data buffer to the plaintext
388
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
389
if(rc != GPG_ERR_NO_ERROR){
390
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
391
gpgme_strsource(rc), gpgme_strerror(rc));
210
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
211
if (rc != GPG_ERR_NO_ERROR){
212
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
213
gpgme_strsource(rc), gpgme_strerror(rc));
392
214
plaintext_length = -1;
394
gpgme_decrypt_result_t result;
395
result = gpgme_op_decrypt_result(mc->ctx);
397
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
399
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
400
result->unsupported_algorithm);
401
fprintf_plus(stderr, "Wrong key usage: %u\n",
402
result->wrong_key_usage);
403
if(result->file_name != NULL){
404
fprintf_plus(stderr, "File name: %s\n", result->file_name);
406
gpgme_recipient_t recipient;
407
recipient = result->recipients;
219
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
223
gpgme_decrypt_result_t result;
224
result = gpgme_op_decrypt_result(ctx);
226
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
228
fprintf(stderr, "Unsupported algorithm: %s\n",
229
result->unsupported_algorithm);
230
fprintf(stderr, "Wrong key usage: %u\n",
231
result->wrong_key_usage);
232
if(result->file_name != NULL){
233
fprintf(stderr, "File name: %s\n", result->file_name);
235
gpgme_recipient_t recipient;
236
recipient = result->recipients;
408
238
while(recipient != NULL){
409
fprintf_plus(stderr, "Public key algorithm: %s\n",
410
gpgme_pubkey_algo_name
411
(recipient->pubkey_algo));
412
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
413
fprintf_plus(stderr, "Secret key available: %s\n",
414
recipient->status == GPG_ERR_NO_SECKEY
239
fprintf(stderr, "Public key algorithm: %s\n",
240
gpgme_pubkey_algo_name(recipient->pubkey_algo));
241
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
242
fprintf(stderr, "Secret key available: %s\n",
243
recipient->status == GPG_ERR_NO_SECKEY
416
245
recipient = recipient->next;
424
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
427
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
428
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
429
perror_plus("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
430
254
plaintext_length = -1;
431
255
goto decrypt_end;
434
258
*plaintext = NULL;
436
plaintext_capacity = incbuffer(plaintext,
437
(size_t)plaintext_length,
439
if(plaintext_capacity == 0){
440
perror_plus("incbuffer");
441
plaintext_length = -1;
260
plaintext_capacity = adjustbuffer(plaintext,
261
(size_t)plaintext_length,
263
if (plaintext_capacity == 0){
264
perror("adjustbuffer");
265
plaintext_length = -1;
445
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
447
271
/* Print the data, if any */
453
perror_plus("gpgme_data_read");
277
perror("gpgme_data_read");
454
278
plaintext_length = -1;
455
279
goto decrypt_end;
457
281
plaintext_length += ret;
461
fprintf_plus(stderr, "Decrypted password is: ");
285
fprintf(stderr, "Decrypted password is: ");
462
286
for(ssize_t i = 0; i < plaintext_length; i++){
463
287
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
629
433
__attribute__((unused)) const char *txt){}
631
435
/* Called when a Mandos server is found */
632
static int start_mandos_communication(const char *ip, in_port_t port,
436
static int start_mandos_communication(const char *ip, uint16_t port,
633
437
AvahiIfIndex if_index,
634
int af, mandos_context *mc){
635
int ret, tcp_sd = -1;
638
struct sockaddr_in in;
639
struct sockaddr_in6 in6;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
641
441
char *buffer = NULL;
642
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
643
443
size_t buffer_length = 0;
644
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
448
char interface[IF_NAMESIZE];
647
449
gnutls_session_t session;
648
int pf; /* Protocol family */
665
fprintf_plus(stderr, "Bad address family: %d\n", af);
670
/* If the interface is specified and we have a list of interfaces */
671
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
672
/* Check if the interface is one of the interfaces we are using */
675
char *interface = NULL;
676
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
678
if(if_nametoindex(interface) == (unsigned int)if_index){
685
/* This interface does not match any in the list, so we don't
686
connect to the server */
688
char interface[IF_NAMESIZE];
689
if(if_indextoname((unsigned int)if_index, interface) == NULL){
690
perror_plus("if_indextoname");
692
fprintf_plus(stderr, "Skipping server on non-used interface"
694
if_indextoname((unsigned int)if_index,
451
ret = init_gnutls_session (mc, &session);
457
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
461
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
468
if(if_indextoname((unsigned int)if_index, interface) == NULL){
469
perror("if_indextoname");
472
fprintf(stderr, "Binding to interface %s\n", interface);
702
ret = init_gnutls_session(&session, mc);
475
memset(&to,0,sizeof(to)); /* Spurious warning */
476
to.in6.sin6_family = AF_INET6;
477
/* It would be nice to have a way to detect if we were passed an
478
IPv4 address here. Now we assume an IPv6 address. */
479
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
708
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
709
PRIuMAX "\n", ip, (uintmax_t)port);
712
tcp_sd = socket(pf, SOCK_STREAM, 0);
715
perror_plus("socket");
725
memset(&to, 0, sizeof(to));
727
to.in6.sin6_family = (sa_family_t)af;
728
ret = inet_pton(af, ip, &to.in6.sin6_addr);
730
to.in.sin_family = (sa_family_t)af;
731
ret = inet_pton(af, ip, &to.in.sin_addr);
735
perror_plus("inet_pton");
741
fprintf_plus(stderr, "Bad address: %s\n", ip);
746
to.in6.sin6_port = htons(port);
748
#pragma GCC diagnostic push
749
#pragma GCC diagnostic ignored "-Wstrict-aliasing"
751
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
752
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower */
754
#pragma GCC diagnostic pop
756
if(if_index == AVAHI_IF_UNSPEC){
757
fprintf_plus(stderr, "An IPv6 link-local address is"
758
" incomplete without a network interface\n");
762
/* Set the network interface number as scope */
763
to.in6.sin6_scope_id = (uint32_t)if_index;
766
to.in.sin_port = htons(port);
485
fprintf(stderr, "Bad address: %s\n", ip);
488
to.in6.sin6_port = htons(port); /* Spurious warning */
490
to.in6.sin6_scope_id = (uint32_t)if_index;
775
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
776
char interface[IF_NAMESIZE];
777
if(if_indextoname((unsigned int)if_index, interface) == NULL){
778
perror_plus("if_indextoname");
780
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
781
"\n", ip, interface, (uintmax_t)port);
493
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
495
char addrstr[INET6_ADDRSTRLEN] = "";
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
497
sizeof(addrstr)) == NULL){
500
if(strcmp(addrstr, ip) != 0){
501
fprintf(stderr, "Canonical address form: %s\n", addrstr);
784
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
785
ip, (uintmax_t)port);
787
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
788
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
790
ret = getnameinfo((struct sockaddr *)&(to.in6), sizeof(to.in6),
791
addrstr, sizeof(addrstr), NULL, 0,
794
ret = getnameinfo((struct sockaddr *)&(to.in), sizeof(to.in),
795
addrstr, sizeof(addrstr), NULL, 0,
798
if(ret == EAI_SYSTEM){
799
perror_plus("getnameinfo");
800
} else if(ret != 0) {
801
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
802
} else if(strcmp(addrstr, ip) != 0){
803
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
813
ret = connect(tcp_sd, &to.in6, sizeof(to));
815
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
818
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
820
perror_plus("connect");
506
ret = connect(tcp_sd, &to.in, sizeof(to));
831
512
const char *out = mandos_protocol_version;
834
515
size_t out_size = strlen(out);
835
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
836
out_size - written));
839
perror_plus("write");
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
843
523
written += (size_t)ret;
844
524
if(written < out_size){
847
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
862
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
870
/* This casting via intptr_t is to eliminate warning about casting
871
an int to a pointer type. This is exactly how the GnuTLS Guile
872
function "set-session-transport-fd!" does it. */
873
gnutls_transport_set_ptr(session,
874
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
882
ret = gnutls_handshake(session);
537
fprintf(stderr, "Establishing TLS session with %s\n", ip);
540
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
543
ret = gnutls_handshake (session);
887
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
889
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
891
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
898
555
/* Read OpenPGP packet that contains the wanted password */
901
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
912
buffer_capacity = incbuffer(&buffer, buffer_length,
914
if(buffer_capacity == 0){
916
perror_plus("incbuffer");
926
sret = gnutls_record_recv(session, buffer+buffer_length,
563
buffer_capacity = adjustbuffer(&buffer, buffer_length,
565
if (buffer_capacity == 0){
566
perror("adjustbuffer");
571
ret = gnutls_record_recv(session, buffer+buffer_length,
933
578
case GNUTLS_E_INTERRUPTED:
934
579
case GNUTLS_E_AGAIN:
936
581
case GNUTLS_E_REHANDSHAKE:
938
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
944
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
946
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
954
fprintf_plus(stderr, "Unknown error while reading data from"
955
" encrypted session with Mandos server\n");
956
gnutls_bye(session, GNUTLS_SHUT_RDWR);
593
fprintf(stderr, "Unknown error while reading data from"
594
" encrypted session with Mandos server\n");
596
gnutls_bye (session, GNUTLS_SHUT_RDWR);
961
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
966
fprintf_plus(stderr, "Closing TLS session\n");
975
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
980
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
982
if(buffer_length > 0){
983
ssize_t decrypted_buffer_size;
984
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
985
&decrypted_buffer, mc);
986
if(decrypted_buffer_size >= 0){
605
fprintf(stderr, "Closing TLS session\n");
608
gnutls_bye (session, GNUTLS_SHUT_RDWR);
610
if (buffer_length > 0){
611
decrypted_buffer_size = pgp_packet_decrypt(buffer,
615
if (decrypted_buffer_size >= 0){
989
617
while(written < (size_t) decrypted_buffer_size){
995
ret = (int)fwrite(decrypted_buffer + written, 1,
996
(size_t)decrypted_buffer_size - written,
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
998
621
if(ret == 0 and ferror(stdout)){
1001
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
623
fprintf(stderr, "Error writing encrypted data: %s\n",
1007
629
written += (size_t)ret;
631
free(decrypted_buffer);
1013
637
/* Shutdown procedure */
1018
free(decrypted_buffer);
1021
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1027
perror_plus("close");
1029
gnutls_deinit(session);
642
gnutls_deinit (session);
1039
646
static void resolve_callback(AvahiSServiceResolver *r,
1040
647
AvahiIfIndex interface,
1041
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1042
649
AvahiResolverEvent event,
1043
650
const char *name,
1044
651
const char *type,
1152
734
case AVAHI_BROWSER_ALL_FOR_NOW:
1153
735
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1155
fprintf_plus(stderr, "No Mandos server found, still"
737
fprintf(stderr, "No Mandos server found, still searching...\n");
1162
/* Signal handler that stops main loop after SIGTERM */
1163
static void handle_sigterm(int sig){
1168
signal_received = sig;
1169
int old_errno = errno;
1170
/* set main loop to exit */
1171
if(simple_poll != NULL){
1172
avahi_simple_poll_quit(simple_poll);
1177
bool get_flags(const char *ifname, struct ifreq *ifr){
1181
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1184
perror_plus("socket");
1188
strcpy(ifr->ifr_name, ifname);
1189
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1193
perror_plus("ioctl SIOCGIFFLAGS");
1201
bool good_flags(const char *ifname, const struct ifreq *ifr){
1203
/* Reject the loopback device */
1204
if(ifr->ifr_flags & IFF_LOOPBACK){
1206
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1211
/* Accept point-to-point devices only if connect_to is specified */
1212
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1214
fprintf_plus(stderr, "Accepting point-to-point interface"
1215
" \"%s\"\n", ifname);
1219
/* Otherwise, reject non-broadcast-capable devices */
1220
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1222
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1223
" \"%s\"\n", ifname);
1227
/* Reject non-ARP interfaces (including dummy interfaces) */
1228
if(ifr->ifr_flags & IFF_NOARP){
1230
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1236
/* Accept this device */
1238
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1244
* This function determines if a directory entry in /sys/class/net
1245
* corresponds to an acceptable network device.
1246
* (This function is passed to scandir(3) as a filter function.)
1248
int good_interface(const struct dirent *if_entry){
1249
if(if_entry->d_name[0] == '.'){
1254
if(not get_flags(if_entry->d_name, &ifr)){
1256
fprintf_plus(stderr, "Failed to get flags for interface "
1257
"\"%s\"\n", if_entry->d_name);
1262
if(not good_flags(if_entry->d_name, &ifr)){
1269
* This function determines if a network interface is up.
1271
bool interface_is_up(const char *interface){
1273
if(not get_flags(interface, &ifr)){
1275
fprintf_plus(stderr, "Failed to get flags for interface "
1276
"\"%s\"\n", interface);
1281
return (bool)(ifr.ifr_flags & IFF_UP);
1285
* This function determines if a network interface is running
1287
bool interface_is_running(const char *interface){
1289
if(not get_flags(interface, &ifr)){
1291
fprintf_plus(stderr, "Failed to get flags for interface "
1292
"\"%s\"\n", interface);
1297
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1300
int notdotentries(const struct dirent *direntry){
1301
/* Skip "." and ".." */
1302
if(direntry->d_name[0] == '.'
1303
and (direntry->d_name[1] == '\0'
1304
or (direntry->d_name[1] == '.'
1305
and direntry->d_name[2] == '\0'))){
1311
/* Is this directory entry a runnable program? */
1312
int runnable_hook(const struct dirent *direntry){
1317
if((direntry->d_name)[0] == '\0'){
1322
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1323
"abcdefghijklmnopqrstuvwxyz"
1326
if((direntry->d_name)[sret] != '\0'){
1327
/* Contains non-allowed characters */
1329
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1335
char *fullname = NULL;
1336
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1338
perror_plus("asprintf");
1342
ret = stat(fullname, &st);
1345
perror_plus("Could not stat hook");
1349
if(not (S_ISREG(st.st_mode))){
1350
/* Not a regular file */
1352
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1357
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1358
/* Not executable */
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1366
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1372
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1373
mandos_context *mc){
1375
struct timespec now;
1376
struct timespec waited_time;
1377
intmax_t block_time;
1380
if(mc->current_server == NULL){
1382
fprintf_plus(stderr, "Wait until first server is found."
1385
ret = avahi_simple_poll_iterate(s, -1);
743
/* Combines file name and path and returns the malloced new
744
string. some sane checks could/should be added */
745
static const char *combinepath(const char *first, const char *second){
746
size_t f_len = strlen(first);
747
size_t s_len = strlen(second);
748
char *tmp = malloc(f_len + s_len + 2);
753
memcpy(tmp, first, f_len); /* Spurious warning */
757
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
759
tmp[f_len + 1 + s_len] = '\0';
764
int main(int argc, char *argv[]){
765
AvahiSServiceBrowser *sb = NULL;
768
int exitcode = EXIT_SUCCESS;
769
const char *interface = "eth0";
770
struct ifreq network;
774
char *connect_to = NULL;
775
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
776
const char *pubkeyfile = "pubkey.txt";
777
const char *seckeyfile = "seckey.txt";
778
mandos_context mc = { .simple_poll = NULL, .server = NULL,
779
.dh_bits = 1024, .priority = "SECURE256"};
780
bool gnutls_initalized = false;
783
struct argp_option options[] = {
784
{ .name = "debug", .key = 128,
785
.doc = "Debug mode", .group = 3 },
786
{ .name = "connect", .key = 'c',
788
.doc = "Connect directly to a sepcified mandos server",
790
{ .name = "interface", .key = 'i',
792
.doc = "Interface that Avahi will conntect through",
794
{ .name = "keydir", .key = 'd',
796
.doc = "Directory where the openpgp keyring is",
798
{ .name = "seckey", .key = 's',
800
.doc = "Secret openpgp key for gnutls authentication",
802
{ .name = "pubkey", .key = 'p',
804
.doc = "Public openpgp key for gnutls authentication",
806
{ .name = "dh-bits", .key = 129,
808
.doc = "dh-bits to use in gnutls communication",
810
{ .name = "priority", .key = 130,
812
.doc = "GNUTLS priority", .group = 1 },
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
857
return ARGP_ERR_UNKNOWN;
862
struct argp argp = { .options = options, .parser = parse_opt,
864
.doc = "Mandos client -- Get and decrypt"
865
" passwords from mandos server" };
866
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
867
if (ret == ARGP_ERR_UNKNOWN){
868
fprintf(stderr, "Unknown error while parsing arguments\n");
869
exitcode = EXIT_FAILURE;
874
pubkeyfile = combinepath(keydir, pubkeyfile);
875
if (pubkeyfile == NULL){
876
perror("combinepath");
877
exitcode = EXIT_FAILURE;
881
seckeyfile = combinepath(keydir, seckeyfile);
882
if (seckeyfile == NULL){
883
perror("combinepath");
884
exitcode = EXIT_FAILURE;
888
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
890
fprintf(stderr, "init_gnutls_global failed\n");
891
exitcode = EXIT_FAILURE;
1388
fprintf_plus(stderr, "Check current_server if we should run"
894
gnutls_initalized = true;
897
/* If the interface is down, bring it up */
899
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
902
exitcode = EXIT_FAILURE;
1391
/* the current time */
1392
ret = clock_gettime(CLOCK_MONOTONIC, &now);
905
strcpy(network.ifr_name, interface); /* Spurious warning */
906
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1394
perror_plus("clock_gettime");
1397
/* Calculating in ms how long time between now and server
1398
who we visted longest time ago. Now - last seen. */
1399
waited_time.tv_sec = (now.tv_sec
1400
- mc->current_server->last_seen.tv_sec);
1401
waited_time.tv_nsec = (now.tv_nsec
1402
- mc->current_server->last_seen.tv_nsec);
1403
/* total time is 10s/10,000ms.
1404
Converting to s from ms by dividing by 1,000,
1405
and ns to ms by dividing by 1,000,000. */
1406
block_time = ((retry_interval
1407
- ((intmax_t)waited_time.tv_sec * 1000))
1408
- ((intmax_t)waited_time.tv_nsec / 1000000));
1411
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1415
if(block_time <= 0){
1416
ret = start_mandos_communication(mc->current_server->ip,
1417
mc->current_server->port,
1418
mc->current_server->if_index,
1419
mc->current_server->af, mc);
1421
avahi_simple_poll_quit(s);
1424
ret = clock_gettime(CLOCK_MONOTONIC,
1425
&mc->current_server->last_seen);
1427
perror_plus("clock_gettime");
1430
mc->current_server = mc->current_server->next;
1431
block_time = 0; /* Call avahi to find new Mandos
1432
servers, but don't block */
1435
ret = avahi_simple_poll_iterate(s, (int)block_time);
1438
if (ret > 0 or errno != EINTR){
1439
return (ret != 1) ? ret : 0;
1445
/* Set effective uid to 0, return errno */
1446
error_t raise_privileges(void){
1447
error_t old_errno = errno;
1448
error_t ret_errno = 0;
1449
if(seteuid(0) == -1){
1451
perror_plus("seteuid");
1457
/* Set effective and real user ID to 0. Return errno. */
1458
error_t raise_privileges_permanently(void){
1459
error_t old_errno = errno;
1460
error_t ret_errno = raise_privileges();
1465
if(setuid(0) == -1){
1467
perror_plus("seteuid");
1473
/* Set effective user ID to unprivileged saved user ID */
1474
error_t lower_privileges(void){
1475
error_t old_errno = errno;
1476
error_t ret_errno = 0;
1477
if(seteuid(uid) == -1){
1479
perror_plus("seteuid");
1485
/* Lower privileges permanently */
1486
error_t lower_privileges_permanently(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(setuid(uid) == -1){
1491
perror_plus("setuid");
1497
bool run_network_hooks(const char *mode, const char *interface,
1499
struct dirent **direntries;
1500
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1503
if(errno == ENOENT){
1505
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1506
" found\n", hookdir);
1509
perror_plus("scandir");
1512
struct dirent *direntry;
1514
int devnull = open("/dev/null", O_RDONLY);
1515
for(int i = 0; i < numhooks; i++){
1516
direntry = direntries[i];
1517
char *fullname = NULL;
1518
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1520
perror_plus("asprintf");
1524
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1527
pid_t hook_pid = fork();
1530
/* Raise privileges */
1531
raise_privileges_permanently();
1536
perror_plus("setgid");
1538
/* Reset supplementary groups */
1540
ret = setgroups(0, NULL);
1542
perror_plus("setgroups");
1544
dup2(devnull, STDIN_FILENO);
1546
dup2(STDERR_FILENO, STDOUT_FILENO);
1547
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1549
perror_plus("setenv");
1552
ret = setenv("DEVICE", interface, 1);
1554
perror_plus("setenv");
1557
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1559
perror_plus("setenv");
1562
ret = setenv("MODE", mode, 1);
1564
perror_plus("setenv");
1568
ret = asprintf(&delaystring, "%f", delay);
1570
perror_plus("asprintf");
1573
ret = setenv("DELAY", delaystring, 1);
1576
perror_plus("setenv");
1580
if(connect_to != NULL){
1581
ret = setenv("CONNECT", connect_to, 1);
1583
perror_plus("setenv");
1587
if(execl(fullname, direntry->d_name, mode, NULL) == -1){
1588
perror_plus("execl");
1589
_exit(EXIT_FAILURE);
1593
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1594
perror_plus("waitpid");
1598
if(WIFEXITED(status)){
1599
if(WEXITSTATUS(status) != 0){
1600
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1601
" with status %d\n", direntry->d_name,
1602
WEXITSTATUS(status));
1606
} else if(WIFSIGNALED(status)){
1607
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1608
" signal %d\n", direntry->d_name,
1613
fprintf_plus(stderr, "Warning: network hook \"%s\""
1614
" crashed\n", direntry->d_name);
1621
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1630
error_t bring_up_interface(const char *const interface,
1633
error_t old_errno = errno;
1634
error_t ret_errno = 0;
1635
int ret, ret_setflags;
1636
struct ifreq network;
1637
unsigned int if_index = if_nametoindex(interface);
1639
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1649
if(not interface_is_up(interface)){
1650
if(not get_flags(interface, &network) and debug){
1652
fprintf_plus(stderr, "Failed to get flags for interface "
1653
"\"%s\"\n", interface);
1656
network.ifr_flags |= IFF_UP;
1658
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1661
perror_plus("socket");
908
perror("ioctl SIOCGIFFLAGS");
909
exitcode = EXIT_FAILURE;
912
if((network.ifr_flags & IFF_UP) == 0){
913
network.ifr_flags |= IFF_UP;
914
ret = ioctl(sd, SIOCSIFFLAGS, &network);
916
perror("ioctl SIOCSIFFLAGS");
917
exitcode = EXIT_FAILURE;
1673
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1677
/* Raise priviliges */
1681
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1682
messages about the network interface to mess up the prompt */
1683
int ret_linux = klogctl(8, NULL, 5);
1684
bool restore_loglevel = true;
1685
if(ret_linux == -1){
1686
restore_loglevel = false;
1687
perror_plus("klogctl");
1689
#endif /* __linux__ */
1690
ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1693
if(restore_loglevel){
1694
ret_linux = klogctl(7, NULL, 0);
1695
if(ret_linux == -1){
1696
perror_plus("klogctl");
937
if_index = (AvahiIfIndex) if_nametoindex(interface);
939
fprintf(stderr, "No such interface: \"%s\"\n", interface);
943
if(connect_to != NULL){
944
/* Connect directly, do not use Zeroconf */
945
/* (Mainly meant for debugging) */
946
char *address = strrchr(connect_to, ':');
948
fprintf(stderr, "No colon in address\n");
949
exitcode = EXIT_FAILURE;
1699
#endif /* __linux__ */
1701
/* Lower privileges */
1704
/* Close the socket */
1705
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1707
perror_plus("close");
1710
if(ret_setflags == -1){
1712
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1717
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1721
/* Sleep checking until interface is running.
1722
Check every 0.25s, up to total time of delay */
1723
for(int i=0; i < delay * 4; i++){
1724
if(interface_is_running(interface)){
1727
struct timespec sleeptime = { .tv_nsec = 250000000 };
1728
ret = nanosleep(&sleeptime, NULL);
1729
if(ret == -1 and errno != EINTR){
1730
perror_plus("nanosleep");
1738
error_t take_down_interface(const char *const interface){
1739
error_t old_errno = errno;
1740
struct ifreq network;
1741
unsigned int if_index = if_nametoindex(interface);
1743
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1747
if(interface_is_up(interface)){
1748
error_t ret_errno = 0;
1749
if(not get_flags(interface, &network) and debug){
1751
fprintf_plus(stderr, "Failed to get flags for interface "
1752
"\"%s\"\n", interface);
1755
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1757
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1760
perror_plus("socket");
1766
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1770
/* Raise priviliges */
1773
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1776
/* Lower privileges */
1779
/* Close the socket */
1780
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1782
perror_plus("close");
1785
if(ret_setflags == -1){
1787
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1792
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1800
int main(int argc, char *argv[]){
1801
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1802
.priority = "SECURE256:!CTYPE-X.509:"
1803
"+CTYPE-OPENPGP", .current_server = NULL,
1804
.interfaces = NULL, .interfaces_size = 0 };
1805
AvahiSServiceBrowser *sb = NULL;
1810
int exitcode = EXIT_SUCCESS;
1811
char *interfaces_to_take_down = NULL;
1812
size_t interfaces_to_take_down_size = 0;
1813
char tempdir[] = "/tmp/mandosXXXXXX";
1814
bool tempdir_created = false;
1815
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1816
const char *seckey = PATHDIR "/" SECKEY;
1817
const char *pubkey = PATHDIR "/" PUBKEY;
1818
char *interfaces_hooks = NULL;
1820
bool gnutls_initialized = false;
1821
bool gpgme_initialized = false;
1823
double retry_interval = 10; /* 10s between trying a server and
1824
retrying the same server again */
1826
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1827
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1832
/* Lower any group privileges we might have, just to be safe */
1836
perror_plus("setgid");
1839
/* Lower user privileges (temporarily) */
1843
perror_plus("seteuid");
1851
struct argp_option options[] = {
1852
{ .name = "debug", .key = 128,
1853
.doc = "Debug mode", .group = 3 },
1854
{ .name = "connect", .key = 'c',
1855
.arg = "ADDRESS:PORT",
1856
.doc = "Connect directly to a specific Mandos server",
1858
{ .name = "interface", .key = 'i',
1860
.doc = "Network interface that will be used to search for"
1863
{ .name = "seckey", .key = 's',
1865
.doc = "OpenPGP secret key file base name",
1867
{ .name = "pubkey", .key = 'p',
1869
.doc = "OpenPGP public key file base name",
1871
{ .name = "dh-bits", .key = 129,
1873
.doc = "Bit length of the prime number used in the"
1874
" Diffie-Hellman key exchange",
1876
{ .name = "priority", .key = 130,
1878
.doc = "GnuTLS priority string for the TLS handshake",
1880
{ .name = "delay", .key = 131,
1882
.doc = "Maximum delay to wait for interface startup",
1884
{ .name = "retry", .key = 132,
1886
.doc = "Retry interval used when denied by the Mandos server",
1888
{ .name = "network-hook-dir", .key = 133,
1890
.doc = "Directory where network hooks are located",
1893
* These reproduce what we would get without ARGP_NO_HELP
1895
{ .name = "help", .key = '?',
1896
.doc = "Give this help list", .group = -1 },
1897
{ .name = "usage", .key = -3,
1898
.doc = "Give a short usage message", .group = -1 },
1899
{ .name = "version", .key = 'V',
1900
.doc = "Print program version", .group = -1 },
1904
error_t parse_opt(int key, char *arg,
1905
struct argp_state *state){
1908
case 128: /* --debug */
1911
case 'c': /* --connect */
1914
case 'i': /* --interface */
1915
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
1918
argp_error(state, "%s", strerror(ret_errno));
1921
case 's': /* --seckey */
1924
case 'p': /* --pubkey */
1927
case 129: /* --dh-bits */
1929
tmpmax = strtoimax(arg, &tmp, 10);
1930
if(errno != 0 or tmp == arg or *tmp != '\0'
1931
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1932
argp_error(state, "Bad number of DH bits");
1934
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1936
case 130: /* --priority */
1939
case 131: /* --delay */
1941
delay = strtof(arg, &tmp);
1942
if(errno != 0 or tmp == arg or *tmp != '\0'){
1943
argp_error(state, "Bad delay");
1945
case 132: /* --retry */
1947
retry_interval = strtod(arg, &tmp);
1948
if(errno != 0 or tmp == arg or *tmp != '\0'
1949
or (retry_interval * 1000) > INT_MAX
1950
or retry_interval < 0){
1951
argp_error(state, "Bad retry interval");
1954
case 133: /* --network-hook-dir */
1958
* These reproduce what we would get without ARGP_NO_HELP
1960
case '?': /* --help */
1961
argp_state_help(state, state->out_stream,
1962
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1963
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1964
case -3: /* --usage */
1965
argp_state_help(state, state->out_stream,
1966
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1967
case 'V': /* --version */
1968
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1969
exit(argp_err_exit_status);
1972
return ARGP_ERR_UNKNOWN;
1977
struct argp argp = { .options = options, .parser = parse_opt,
1979
.doc = "Mandos client -- Get and decrypt"
1980
" passwords from a Mandos server" };
1981
ret = argp_parse(&argp, argc, argv,
1982
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1989
perror_plus("argp_parse");
1990
exitcode = EX_OSERR;
1993
exitcode = EX_USAGE;
1999
/* Work around Debian bug #633582:
2000
<http://bugs.debian.org/633582> */
2002
/* Re-raise priviliges */
2003
if(raise_privileges() == 0){
2006
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2007
int seckey_fd = open(seckey, O_RDONLY);
2008
if(seckey_fd == -1){
2009
perror_plus("open");
2011
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2013
perror_plus("fstat");
2015
if(S_ISREG(st.st_mode)
2016
and st.st_uid == 0 and st.st_gid == 0){
2017
ret = fchown(seckey_fd, uid, gid);
2019
perror_plus("fchown");
2023
TEMP_FAILURE_RETRY(close(seckey_fd));
2027
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2028
int pubkey_fd = open(pubkey, O_RDONLY);
2029
if(pubkey_fd == -1){
2030
perror_plus("open");
2032
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2034
perror_plus("fstat");
2036
if(S_ISREG(st.st_mode)
2037
and st.st_uid == 0 and st.st_gid == 0){
2038
ret = fchown(pubkey_fd, uid, gid);
2040
perror_plus("fchown");
2044
TEMP_FAILURE_RETRY(close(pubkey_fd));
2048
/* Lower privileges */
2053
/* Remove invalid interface names (except "none") */
2055
char *interface = NULL;
2056
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2058
if(strcmp(interface, "none") != 0
2059
and if_nametoindex(interface) == 0){
2060
if(interface[0] != '\0'){
2061
fprintf_plus(stderr, "Not using nonexisting interface"
2062
" \"%s\"\n", interface);
2064
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2070
/* Run network hooks */
2072
if(mc.interfaces != NULL){
2073
interfaces_hooks = malloc(mc.interfaces_size);
2074
if(interfaces_hooks == NULL){
2075
perror_plus("malloc");
953
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
955
perror("Bad port number");
956
exitcode = EXIT_FAILURE;
2078
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2079
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2081
if(not run_network_hooks("start", interfaces_hooks != NULL ?
2082
interfaces_hooks : "", delay)){
2088
avahi_set_log_function(empty_log);
2091
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2092
from the signal handler */
2093
/* Initialize the pseudo-RNG for Avahi */
2094
srand((unsigned int) time(NULL));
2095
simple_poll = avahi_simple_poll_new();
2096
if(simple_poll == NULL){
2097
fprintf_plus(stderr,
2098
"Avahi: Failed to create simple poll object.\n");
2099
exitcode = EX_UNAVAILABLE;
2103
sigemptyset(&sigterm_action.sa_mask);
2104
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2106
perror_plus("sigaddset");
2107
exitcode = EX_OSERR;
2110
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2112
perror_plus("sigaddset");
2113
exitcode = EX_OSERR;
2116
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2118
perror_plus("sigaddset");
2119
exitcode = EX_OSERR;
2122
/* Need to check if the handler is SIG_IGN before handling:
2123
| [[info:libc:Initial Signal Actions]] |
2124
| [[info:libc:Basic Signal Handling]] |
2126
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2128
perror_plus("sigaction");
2131
if(old_sigterm_action.sa_handler != SIG_IGN){
2132
ret = sigaction(SIGINT, &sigterm_action, NULL);
2134
perror_plus("sigaction");
2135
exitcode = EX_OSERR;
2139
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2141
perror_plus("sigaction");
2144
if(old_sigterm_action.sa_handler != SIG_IGN){
2145
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2147
perror_plus("sigaction");
2148
exitcode = EX_OSERR;
2152
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2154
perror_plus("sigaction");
2157
if(old_sigterm_action.sa_handler != SIG_IGN){
2158
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2160
perror_plus("sigaction");
2161
exitcode = EX_OSERR;
2166
/* If no interfaces were specified, make a list */
2167
if(mc.interfaces == NULL){
2168
struct dirent **direntries;
2169
/* Look for any good interfaces */
2170
ret = scandir(sys_class_net, &direntries, good_interface,
2173
/* Add all found interfaces to interfaces list */
2174
for(int i = 0; i < ret; ++i){
2175
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2176
direntries[i]->d_name);
2179
perror_plus("argz_add");
2183
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2184
direntries[i]->d_name);
2190
fprintf_plus(stderr, "Could not find a network interface\n");
2191
exitcode = EXIT_FAILURE;
2196
/* Bring up interfaces which are down, and remove any "none"s */
2198
char *interface = NULL;
2199
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2201
/* If interface name is "none", stop bringing up interfaces.
2202
Also remove all instances of "none" from the list */
2203
if(strcmp(interface, "none") == 0){
2204
argz_delete(&mc.interfaces, &mc.interfaces_size,
2207
while((interface = argz_next(mc.interfaces,
2208
mc.interfaces_size, interface))){
2209
if(strcmp(interface, "none") == 0){
2210
argz_delete(&mc.interfaces, &mc.interfaces_size,
2217
bool interface_was_up = interface_is_up(interface);
2218
ret = bring_up_interface(interface, delay);
2219
if(not interface_was_up){
2222
perror_plus("Failed to bring up interface");
2224
ret_errno = argz_add(&interfaces_to_take_down,
2225
&interfaces_to_take_down_size,
2229
perror_plus("argz_add");
2234
if(debug and (interfaces_to_take_down == NULL)){
2235
fprintf_plus(stderr, "No interfaces were brought up\n");
2239
/* If we only got one interface, explicitly use only that one */
2240
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2242
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2245
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2252
ret = init_gnutls_global(pubkey, seckey, &mc);
2254
fprintf_plus(stderr, "init_gnutls_global failed\n");
2255
exitcode = EX_UNAVAILABLE;
2258
gnutls_initialized = true;
2265
if(mkdtemp(tempdir) == NULL){
2266
perror_plus("mkdtemp");
2269
tempdir_created = true;
2275
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2276
fprintf_plus(stderr, "init_gpgme failed\n");
2277
exitcode = EX_UNAVAILABLE;
2280
gpgme_initialized = true;
2287
if(connect_to != NULL){
2288
/* Connect directly, do not use Zeroconf */
2289
/* (Mainly meant for debugging) */
2290
char *address = strrchr(connect_to, ':');
2292
if(address == NULL){
2293
fprintf_plus(stderr, "No colon in address\n");
2294
exitcode = EX_USAGE;
2304
tmpmax = strtoimax(address+1, &tmp, 10);
2305
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2306
or tmpmax != (in_port_t)tmpmax){
2307
fprintf_plus(stderr, "Bad port number\n");
2308
exitcode = EX_USAGE;
2316
port = (in_port_t)tmpmax;
2318
/* Colon in address indicates IPv6 */
2320
if(strchr(connect_to, ':') != NULL){
2322
/* Accept [] around IPv6 address - see RFC 5952 */
2323
if(connect_to[0] == '[' and address[-1] == ']')
2331
address = connect_to;
2337
while(not quit_now){
2338
ret = start_mandos_communication(address, port, if_index, af,
2340
if(quit_now or ret == 0){
2344
fprintf_plus(stderr, "Retrying in %d seconds\n",
2345
(int)retry_interval);
2347
sleep((unsigned int)retry_interval);
2351
exitcode = EXIT_SUCCESS;
2362
AvahiServerConfig config;
2363
/* Do not publish any local Zeroconf records */
2364
avahi_server_config_init(&config);
2365
config.publish_hinfo = 0;
2366
config.publish_addresses = 0;
2367
config.publish_workstation = 0;
2368
config.publish_domain = 0;
2370
/* Allocate a new server */
2371
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2372
&config, NULL, NULL, &ret_errno);
2374
/* Free the Avahi configuration data */
2375
avahi_server_config_free(&config);
2378
/* Check if creating the Avahi server object succeeded */
2379
if(mc.server == NULL){
2380
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2381
avahi_strerror(ret_errno));
2382
exitcode = EX_UNAVAILABLE;
2390
/* Create the Avahi service browser */
2391
sb = avahi_s_service_browser_new(mc.server, if_index,
2392
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2393
NULL, 0, browse_callback,
2396
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2397
avahi_strerror(avahi_server_errno(mc.server)));
2398
exitcode = EX_UNAVAILABLE;
2406
/* Run the main loop */
2409
fprintf_plus(stderr, "Starting Avahi loop search\n");
2412
ret = avahi_loop_with_timeout(simple_poll,
2413
(int)(retry_interval * 1000), &mc);
2415
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2416
(ret == 0) ? "successfully" : "with error");
960
address = connect_to;
961
ret = start_mandos_communication(address, port, if_index, &mc);
963
exitcode = EXIT_FAILURE;
965
exitcode = EXIT_SUCCESS;
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);
2422
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2425
/* Cleanup things */
2426
free(mc.interfaces);
2429
avahi_s_service_browser_free(sb);
2431
if(mc.server != NULL)
2432
avahi_server_free(mc.server);
2434
if(simple_poll != NULL)
2435
avahi_simple_poll_free(simple_poll);
2437
if(gnutls_initialized){
2438
gnutls_certificate_free_credentials(mc.cred);
2439
gnutls_global_deinit();
2440
gnutls_dh_params_deinit(mc.dh_params);
2443
if(gpgme_initialized){
2444
gpgme_release(mc.ctx);
2447
/* Cleans up the circular linked list of Mandos servers the client
2449
if(mc.current_server != NULL){
2450
mc.current_server->prev->next = NULL;
2451
while(mc.current_server != NULL){
2452
server *next = mc.current_server->next;
2453
free(mc.current_server);
2454
mc.current_server = next;
2458
/* Re-raise priviliges */
2462
/* Run network hooks */
2463
run_network_hooks("stop", interfaces_hooks != NULL ?
2464
interfaces_hooks : "", delay);
2466
/* Take down the network interfaces which were brought up */
2468
char *interface = NULL;
2469
while((interface=argz_next(interfaces_to_take_down,
2470
interfaces_to_take_down_size,
2472
ret_errno = take_down_interface(interface);
2475
perror_plus("Failed to take down interface");
2478
if(debug and (interfaces_to_take_down == NULL)){
2479
fprintf_plus(stderr, "No interfaces needed to be taken"
2484
lower_privileges_permanently();
2487
free(interfaces_to_take_down);
2488
free(interfaces_hooks);
2490
/* Removes the GPGME temp directory and all files inside */
2491
if(tempdir_created){
2492
struct dirent **direntries = NULL;
2493
struct dirent *direntry = NULL;
2494
int numentries = scandir(tempdir, &direntries, notdotentries,
2496
if (numentries > 0){
2497
for(int i = 0; i < numentries; i++){
2498
direntry = direntries[i];
2499
char *fullname = NULL;
2500
ret = asprintf(&fullname, "%s/%s", tempdir,
2503
perror_plus("asprintf");
2506
ret = remove(fullname);
2508
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2515
/* need to clean even if 0 because man page doesn't specify */
2517
if (numentries == -1){
2518
perror_plus("scandir");
2520
ret = rmdir(tempdir);
2521
if(ret == -1 and errno != ENOENT){
2522
perror_plus("rmdir");
2527
sigemptyset(&old_sigterm_action.sa_mask);
2528
old_sigterm_action.sa_handler = SIG_DFL;
2529
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2530
&old_sigterm_action,
2533
perror_plus("sigaction");
2536
ret = raise(signal_received);
2537
} while(ret != 0 and errno == EINTR);
2539
perror_plus("raise");
2542
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 ();