99
131
#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"
101
138
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
139
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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;
107
160
/* Used for passing in values through the Avahi callback functions */
109
AvahiSimplePoll *simple_poll;
110
162
AvahiServer *server;
111
163
gnutls_certificate_credentials_t cred;
112
164
unsigned int dh_bits;
113
165
gnutls_dh_params_t dh_params;
114
166
const char *priority;
168
server *current_server;
170
size_t interfaces_size;
115
171
} 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));
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
199
* Make additional room in "buffer" for at least BUFFER_SIZE more
200
* bytes. "buffer_capacity" is how much is currently allocated,
120
201
* "buffer_length" is how much is already used.
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);
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;
129
216
buffer_capacity += BUFFER_SIZE;
131
218
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");
239
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
241
perror_plus("clock_gettime");
244
/* Special case of first server */
245
if(*current_server == NULL){
246
new_server->next = new_server;
247
new_server->prev = new_server;
248
*current_server = new_server;
250
/* Place the new server last in the list */
251
new_server->next = *current_server;
252
new_server->prev = (*current_server)->prev;
253
new_server->prev->next = new_server;
254
(*current_server)->prev = new_server;
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
262
__attribute__((nonnull, warn_unused_result))
263
static bool init_gpgme(const char * const seckey,
264
const char * const pubkey,
265
const char * const tempdir,
144
267
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
148
268
gpgme_engine_info_t engine_info;
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
271
* Helper function to insert pub and seckey to the engine keyring.
273
bool import_key(const char * const filename){
276
gpgme_data_t pgp_data;
278
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
284
rc = gpgme_data_new_from_fd(&pgp_data, fd);
285
if(rc != GPG_ERR_NO_ERROR){
286
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
287
gpgme_strsource(rc), gpgme_strerror(rc));
291
rc = gpgme_op_import(mc->ctx, pgp_data);
292
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
298
ret = (int)TEMP_FAILURE_RETRY(close(fd));
300
perror_plus("close");
302
gpgme_data_release(pgp_data);
307
fprintf_plus(stderr, "Initializing GPGME\n");
155
311
gpgme_check_version(NULL);
156
312
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
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));
313
if(rc != GPG_ERR_NO_ERROR){
314
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
315
gpgme_strsource(rc), gpgme_strerror(rc));
163
319
/* Set GPGME home directory for the OpenPGP engine only */
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));
320
rc = gpgme_get_engine_info(&engine_info);
321
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
323
gpgme_strsource(rc), gpgme_strerror(rc));
170
326
while(engine_info != NULL){
171
327
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
172
328
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
173
engine_info->file_name, homedir);
329
engine_info->file_name, tempdir);
176
332
engine_info = engine_info->next;
178
334
if(engine_info == NULL){
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
335
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
340
/* Create new GPGME "context" */
341
rc = gpgme_new(&(mc->ctx));
342
if(rc != GPG_ERR_NO_ERROR){
343
fprintf_plus(stderr, "Mandos plugin mandos-client: "
344
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
349
if(not import_key(pubkey) or not import_key(seckey)){
357
* Decrypt OpenPGP data.
358
* Returns -1 on error
360
__attribute__((nonnull, warn_unused_result))
361
static ssize_t pgp_packet_decrypt(const char *cryptotext,
365
gpgme_data_t dh_crypto, dh_plain;
368
size_t plaintext_capacity = 0;
369
ssize_t plaintext_length = 0;
372
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
183
375
/* Create new GPGME data buffer from memory cryptotext */
184
376
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
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));
378
if(rc != GPG_ERR_NO_ERROR){
379
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
380
gpgme_strsource(rc), gpgme_strerror(rc));
192
384
/* Create new empty GPGME data buffer for the plaintext */
193
385
rc = gpgme_data_new(&dh_plain);
194
if (rc != GPG_ERR_NO_ERROR){
195
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
196
gpgme_strsource(rc), gpgme_strerror(rc));
386
if(rc != GPG_ERR_NO_ERROR){
387
fprintf_plus(stderr, "Mandos plugin mandos-client: "
388
"bad gpgme_data_new: %s: %s\n",
389
gpgme_strsource(rc), gpgme_strerror(rc));
197
390
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;
210
394
/* Decrypt data from the cryptotext data buffer to the plaintext
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));
396
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
397
if(rc != GPG_ERR_NO_ERROR){
398
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
399
gpgme_strsource(rc), gpgme_strerror(rc));
216
400
plaintext_length = -1;
218
402
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
403
result = gpgme_op_decrypt_result(mc->ctx);
405
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
407
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
408
result->unsupported_algorithm);
409
fprintf_plus(stderr, "Wrong key usage: %u\n",
410
result->wrong_key_usage);
227
411
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
412
fprintf_plus(stderr, "File name: %s\n", result->file_name);
230
414
gpgme_recipient_t recipient;
231
415
recipient = result->recipients;
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
240
recipient = recipient->next;
416
while(recipient != NULL){
417
fprintf_plus(stderr, "Public key algorithm: %s\n",
418
gpgme_pubkey_algo_name
419
(recipient->pubkey_algo));
420
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
421
fprintf_plus(stderr, "Secret key available: %s\n",
422
recipient->status == GPG_ERR_NO_SECKEY
424
recipient = recipient->next;
436
641
__attribute__((unused)) const char *txt){}
438
643
/* Called when a Mandos server is found */
439
static int start_mandos_communication(const char *ip, uint16_t port,
644
__attribute__((nonnull, warn_unused_result))
645
static int start_mandos_communication(const char *ip, in_port_t port,
440
646
AvahiIfIndex if_index,
443
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
647
int af, mandos_context *mc){
648
int ret, tcp_sd = -1;
650
struct sockaddr_storage to;
444
651
char *buffer = NULL;
445
char *decrypted_buffer;
652
char *decrypted_buffer = NULL;
446
653
size_t buffer_length = 0;
447
654
size_t buffer_capacity = 0;
448
ssize_t decrypted_buffer_size;
451
char interface[IF_NAMESIZE];
452
657
gnutls_session_t session;
454
ret = init_gnutls_session (mc, &session);
460
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
464
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
471
if(if_indextoname((unsigned int)if_index, interface) == NULL){
472
perror("if_indextoname");
658
int pf; /* Protocol family */
675
fprintf_plus(stderr, "Bad address family: %d\n", af);
680
/* If the interface is specified and we have a list of interfaces */
681
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
682
/* Check if the interface is one of the interfaces we are using */
685
char *interface = NULL;
686
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
688
if(if_nametoindex(interface) == (unsigned int)if_index){
695
/* This interface does not match any in the list, so we don't
696
connect to the server */
698
char interface[IF_NAMESIZE];
699
if(if_indextoname((unsigned int)if_index, interface) == NULL){
700
perror_plus("if_indextoname");
702
fprintf_plus(stderr, "Skipping server on non-used interface"
704
if_indextoname((unsigned int)if_index,
475
fprintf(stderr, "Binding to interface %s\n", interface);
712
ret = init_gnutls_session(&session, mc);
718
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
719
PRIuMAX "\n", ip, (uintmax_t)port);
722
tcp_sd = socket(pf, SOCK_STREAM, 0);
725
perror_plus("socket");
478
735
memset(&to, 0, sizeof(to));
479
to.in6.sin6_family = AF_INET6;
480
/* It would be nice to have a way to detect if we were passed an
481
IPv4 address here. Now we assume an IPv6 address. */
482
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
737
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
738
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
740
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
741
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
745
perror_plus("inet_pton");
488
fprintf(stderr, "Bad address: %s\n", ip);
491
to.in6.sin6_port = htons(port); /* Spurious warning */
751
fprintf_plus(stderr, "Bad address: %s\n", ip);
756
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
757
if(IN6_IS_ADDR_LINKLOCAL
758
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
759
if(if_index == AVAHI_IF_UNSPEC){
760
fprintf_plus(stderr, "An IPv6 link-local address is"
761
" incomplete without a network interface\n");
765
/* Set the network interface number as scope */
766
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
769
((struct sockaddr_in *)&to)->sin_port = htons(port);
493
to.in6.sin6_scope_id = (uint32_t)if_index;
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
498
char addrstr[INET6_ADDRSTRLEN] = "";
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
500
sizeof(addrstr)) == NULL){
503
if(strcmp(addrstr, ip) != 0){
504
fprintf(stderr, "Canonical address form: %s\n", addrstr);
778
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
779
char interface[IF_NAMESIZE];
780
if(if_indextoname((unsigned int)if_index, interface) == NULL){
781
perror_plus("if_indextoname");
783
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
784
"\n", ip, interface, (uintmax_t)port);
509
ret = connect(tcp_sd, &to.in, sizeof(to));
787
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
788
ip, (uintmax_t)port);
790
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
791
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
793
ret = getnameinfo((struct sockaddr *)&to,
794
sizeof(struct sockaddr_in6),
795
addrstr, sizeof(addrstr), NULL, 0,
798
ret = getnameinfo((struct sockaddr *)&to,
799
sizeof(struct sockaddr_in),
800
addrstr, sizeof(addrstr), NULL, 0,
803
if(ret == EAI_SYSTEM){
804
perror_plus("getnameinfo");
805
} else if(ret != 0) {
806
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
807
} else if(strcmp(addrstr, ip) != 0){
808
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
818
ret = connect(tcp_sd, (struct sockaddr *)&to,
819
sizeof(struct sockaddr_in6));
821
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
822
sizeof(struct sockaddr_in));
825
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
827
perror_plus("connect");
515
838
const char *out = mandos_protocol_version;
518
841
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
842
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
843
out_size - written));
846
perror_plus("write");
526
850
written += (size_t)ret;
527
851
if(written < out_size){
530
if (out == mandos_protocol_version){
854
if(out == mandos_protocol_version){
540
fprintf(stderr, "Establishing TLS session with %s\n", ip);
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
546
ret = gnutls_handshake (session);
869
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
877
/* This casting via intptr_t is to eliminate warning about casting
878
an int to a pointer type. This is exactly how the GnuTLS Guile
879
function "set-session-transport-fd!" does it. */
880
gnutls_transport_set_ptr(session,
881
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
889
ret = gnutls_handshake(session);
547
894
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
549
if (ret != GNUTLS_E_SUCCESS){
896
if(ret != GNUTLS_E_SUCCESS){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
898
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
558
905
/* Read OpenPGP packet that contains the wanted password */
561
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
908
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
566
buffer_capacity = adjustbuffer(&buffer, buffer_length,
568
if (buffer_capacity == 0){
569
perror("adjustbuffer");
574
ret = gnutls_record_recv(session, buffer+buffer_length,
919
buffer_capacity = incbuffer(&buffer, buffer_length,
921
if(buffer_capacity == 0){
923
perror_plus("incbuffer");
933
sret = gnutls_record_recv(session, buffer+buffer_length,
581
940
case GNUTLS_E_INTERRUPTED:
582
941
case GNUTLS_E_AGAIN:
584
943
case GNUTLS_E_REHANDSHAKE:
586
ret = gnutls_handshake (session);
945
ret = gnutls_handshake(session);
587
951
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
589
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
953
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
596
fprintf(stderr, "Unknown error while reading data from"
597
" encrypted session with Mandos server\n");
599
gnutls_bye (session, GNUTLS_SHUT_RDWR);
961
fprintf_plus(stderr, "Unknown error while reading data from"
962
" encrypted session with Mandos server\n");
963
gnutls_bye(session, GNUTLS_SHUT_RDWR);
603
buffer_length += (size_t) ret;
968
buffer_length += (size_t) sret;
608
fprintf(stderr, "Closing TLS session\n");
611
gnutls_bye (session, GNUTLS_SHUT_RDWR);
613
if (buffer_length > 0){
614
decrypted_buffer_size = pgp_packet_decrypt(buffer,
618
if (decrypted_buffer_size >= 0){
973
fprintf_plus(stderr, "Closing TLS session\n");
982
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
987
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
989
if(buffer_length > 0){
990
ssize_t decrypted_buffer_size;
991
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
992
&decrypted_buffer, mc);
993
if(decrypted_buffer_size >= 0){
620
996
while(written < (size_t) decrypted_buffer_size){
621
ret = (int)fwrite (decrypted_buffer + written, 1,
622
(size_t)decrypted_buffer_size - written,
1002
ret = (int)fwrite(decrypted_buffer + written, 1,
1003
(size_t)decrypted_buffer_size - written,
624
1005
if(ret == 0 and ferror(stdout)){
626
fprintf(stderr, "Error writing encrypted data: %s\n",
1008
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
632
1014
written += (size_t)ret;
634
free(decrypted_buffer);
642
1020
/* Shutdown procedure */
647
gnutls_deinit (session);
1025
free(decrypted_buffer);
1028
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1034
perror_plus("close");
1036
gnutls_deinit(session);
1046
__attribute__((nonnull))
651
1047
static void resolve_callback(AvahiSServiceResolver *r,
652
1048
AvahiIfIndex interface,
653
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1049
AvahiProtocol proto,
654
1050
AvahiResolverEvent event,
655
1051
const char *name,
656
1052
const char *type,
739
1160
case AVAHI_BROWSER_ALL_FOR_NOW:
740
1161
case AVAHI_BROWSER_CACHE_EXHAUSTED:
742
fprintf(stderr, "No Mandos server found, still searching...\n");
1163
fprintf_plus(stderr, "No Mandos server found, still"
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
1170
/* Signal handler that stops main loop after SIGTERM */
1171
static void handle_sigterm(int sig){
1176
signal_received = sig;
1177
int old_errno = errno;
1178
/* set main loop to exit */
1179
if(simple_poll != NULL){
1180
avahi_simple_poll_quit(simple_poll);
1185
__attribute__((nonnull, warn_unused_result))
1186
bool get_flags(const char *ifname, struct ifreq *ifr){
1190
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1193
perror_plus("socket");
1197
strcpy(ifr->ifr_name, ifname);
1198
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1202
perror_plus("ioctl SIOCGIFFLAGS");
1210
__attribute__((nonnull, warn_unused_result))
1211
bool good_flags(const char *ifname, const struct ifreq *ifr){
1213
/* Reject the loopback device */
1214
if(ifr->ifr_flags & IFF_LOOPBACK){
1216
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1221
/* Accept point-to-point devices only if connect_to is specified */
1222
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1224
fprintf_plus(stderr, "Accepting point-to-point interface"
1225
" \"%s\"\n", ifname);
1229
/* Otherwise, reject non-broadcast-capable devices */
1230
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1232
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1233
" \"%s\"\n", ifname);
1237
/* Reject non-ARP interfaces (including dummy interfaces) */
1238
if(ifr->ifr_flags & IFF_NOARP){
1240
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1246
/* Accept this device */
1248
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1254
* This function determines if a directory entry in /sys/class/net
1255
* corresponds to an acceptable network device.
1256
* (This function is passed to scandir(3) as a filter function.)
1258
__attribute__((nonnull, warn_unused_result))
1259
int good_interface(const struct dirent *if_entry){
1260
if(if_entry->d_name[0] == '.'){
1265
if(not get_flags(if_entry->d_name, &ifr)){
1267
fprintf_plus(stderr, "Failed to get flags for interface "
1268
"\"%s\"\n", if_entry->d_name);
1273
if(not good_flags(if_entry->d_name, &ifr)){
1280
* This function determines if a network interface is up.
1282
__attribute__((nonnull, warn_unused_result))
1283
bool interface_is_up(const char *interface){
1285
if(not get_flags(interface, &ifr)){
1287
fprintf_plus(stderr, "Failed to get flags for interface "
1288
"\"%s\"\n", interface);
1293
return (bool)(ifr.ifr_flags & IFF_UP);
1297
* This function determines if a network interface is running
1299
__attribute__((nonnull, warn_unused_result))
1300
bool interface_is_running(const char *interface){
1302
if(not get_flags(interface, &ifr)){
1304
fprintf_plus(stderr, "Failed to get flags for interface "
1305
"\"%s\"\n", interface);
1310
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1313
__attribute__((nonnull, pure, warn_unused_result))
1314
int notdotentries(const struct dirent *direntry){
1315
/* Skip "." and ".." */
1316
if(direntry->d_name[0] == '.'
1317
and (direntry->d_name[1] == '\0'
1318
or (direntry->d_name[1] == '.'
1319
and direntry->d_name[2] == '\0'))){
1325
/* Is this directory entry a runnable program? */
1326
__attribute__((nonnull, warn_unused_result))
1327
int runnable_hook(const struct dirent *direntry){
1332
if((direntry->d_name)[0] == '\0'){
1337
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1338
"abcdefghijklmnopqrstuvwxyz"
1341
if((direntry->d_name)[sret] != '\0'){
1342
/* Contains non-allowed characters */
1344
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1350
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1353
perror_plus("Could not stat hook");
1357
if(not (S_ISREG(st.st_mode))){
1358
/* Not a regular file */
1360
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1365
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1366
/* Not executable */
1368
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1374
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1380
__attribute__((nonnull, warn_unused_result))
1381
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1382
mandos_context *mc){
1384
struct timespec now;
1385
struct timespec waited_time;
1386
intmax_t block_time;
1389
if(mc->current_server == NULL){
1391
fprintf_plus(stderr, "Wait until first server is found."
1394
ret = avahi_simple_poll_iterate(s, -1);
1397
fprintf_plus(stderr, "Check current_server if we should run"
1400
/* the current time */
1401
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1403
perror_plus("clock_gettime");
1406
/* Calculating in ms how long time between now and server
1407
who we visted longest time ago. Now - last seen. */
1408
waited_time.tv_sec = (now.tv_sec
1409
- mc->current_server->last_seen.tv_sec);
1410
waited_time.tv_nsec = (now.tv_nsec
1411
- mc->current_server->last_seen.tv_nsec);
1412
/* total time is 10s/10,000ms.
1413
Converting to s from ms by dividing by 1,000,
1414
and ns to ms by dividing by 1,000,000. */
1415
block_time = ((retry_interval
1416
- ((intmax_t)waited_time.tv_sec * 1000))
1417
- ((intmax_t)waited_time.tv_nsec / 1000000));
1420
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1424
if(block_time <= 0){
1425
ret = start_mandos_communication(mc->current_server->ip,
1426
mc->current_server->port,
1427
mc->current_server->if_index,
1428
mc->current_server->af, mc);
1430
avahi_simple_poll_quit(s);
1433
ret = clock_gettime(CLOCK_MONOTONIC,
1434
&mc->current_server->last_seen);
1436
perror_plus("clock_gettime");
1439
mc->current_server = mc->current_server->next;
1440
block_time = 0; /* Call avahi to find new Mandos
1441
servers, but don't block */
1444
ret = avahi_simple_poll_iterate(s, (int)block_time);
1447
if(ret > 0 or errno != EINTR){
1448
return (ret != 1) ? ret : 0;
1454
/* Set effective uid to 0, return errno */
1455
__attribute__((warn_unused_result))
1456
error_t raise_privileges(void){
1457
error_t old_errno = errno;
1458
error_t ret_errno = 0;
1459
if(seteuid(0) == -1){
1461
perror_plus("seteuid");
1467
/* Set effective and real user ID to 0. Return errno. */
1468
__attribute__((warn_unused_result))
1469
error_t raise_privileges_permanently(void){
1470
error_t old_errno = errno;
1471
error_t ret_errno = raise_privileges();
1476
if(setuid(0) == -1){
1478
perror_plus("seteuid");
1484
/* Set effective user ID to unprivileged saved user ID */
1485
__attribute__((warn_unused_result))
1486
error_t lower_privileges(void){
1487
error_t old_errno = errno;
1488
error_t ret_errno = 0;
1489
if(seteuid(uid) == -1){
1491
perror_plus("seteuid");
1497
/* Lower privileges permanently */
1498
__attribute__((warn_unused_result))
1499
error_t lower_privileges_permanently(void){
1500
error_t old_errno = errno;
1501
error_t ret_errno = 0;
1502
if(setuid(uid) == -1){
1504
perror_plus("setuid");
1510
__attribute__((nonnull))
1511
void run_network_hooks(const char *mode, const char *interface,
1513
struct dirent **direntries;
1514
if(hookdir_fd == -1){
1515
hookdir_fd = open(hookdir, O_RDONLY);
1516
if(hookdir_fd == -1){
1517
if(errno == ENOENT){
1519
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1520
" found\n", hookdir);
1523
perror_plus("open");
1529
#if __GLIBC_PREREQ(2, 15)
1530
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1531
runnable_hook, alphasort);
1532
#else /* not __GLIBC_PREREQ(2, 15) */
1533
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1535
#endif /* not __GLIBC_PREREQ(2, 15) */
1536
#else /* not __GLIBC__ */
1537
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1539
#endif /* not __GLIBC__ */
1541
perror_plus("scandir");
1544
struct dirent *direntry;
1546
int devnull = open("/dev/null", O_RDONLY);
1547
for(int i = 0; i < numhooks; i++){
1548
direntry = direntries[i];
1550
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1553
pid_t hook_pid = fork();
1556
/* Raise privileges */
1557
if(raise_privileges_permanently() != 0){
1558
perror_plus("Failed to raise privileges");
1565
perror_plus("setgid");
1568
/* Reset supplementary groups */
1570
ret = setgroups(0, NULL);
1572
perror_plus("setgroups");
1575
ret = dup2(devnull, STDIN_FILENO);
1577
perror_plus("dup2(devnull, STDIN_FILENO)");
1580
ret = close(devnull);
1582
perror_plus("close");
1585
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1587
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1590
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1592
perror_plus("setenv");
1595
ret = setenv("DEVICE", interface, 1);
1597
perror_plus("setenv");
1600
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1602
perror_plus("setenv");
1605
ret = setenv("MODE", mode, 1);
1607
perror_plus("setenv");
1611
ret = asprintf(&delaystring, "%f", (double)delay);
1613
perror_plus("asprintf");
1616
ret = setenv("DELAY", delaystring, 1);
1619
perror_plus("setenv");
1623
if(connect_to != NULL){
1624
ret = setenv("CONNECT", connect_to, 1);
1626
perror_plus("setenv");
1630
int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);
1632
perror_plus("openat");
1633
_exit(EXIT_FAILURE);
1635
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1636
perror_plus("close");
1637
_exit(EXIT_FAILURE);
1639
if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },
1641
perror_plus("fexecve");
1642
_exit(EXIT_FAILURE);
1646
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1647
perror_plus("waitpid");
1650
if(WIFEXITED(status)){
1651
if(WEXITSTATUS(status) != 0){
1652
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1653
" with status %d\n", direntry->d_name,
1654
WEXITSTATUS(status));
1657
} else if(WIFSIGNALED(status)){
1658
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1659
" signal %d\n", direntry->d_name,
1663
fprintf_plus(stderr, "Warning: network hook \"%s\""
1664
" crashed\n", direntry->d_name);
1669
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1673
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1674
perror_plus("close");
1681
__attribute__((nonnull, warn_unused_result))
1682
error_t bring_up_interface(const char *const interface,
1684
error_t old_errno = errno;
1686
struct ifreq network;
1687
unsigned int if_index = if_nametoindex(interface);
1689
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1699
if(not interface_is_up(interface)){
1700
error_t ret_errno = 0, ioctl_errno = 0;
1701
if(not get_flags(interface, &network)){
1703
fprintf_plus(stderr, "Failed to get flags for interface "
1704
"\"%s\"\n", interface);
1708
network.ifr_flags |= IFF_UP; /* set flag */
1710
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1713
perror_plus("socket");
1719
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1721
perror_plus("close");
1728
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1732
/* Raise privileges */
1733
ret_errno = raise_privileges();
1735
perror_plus("Failed to raise privileges");
1740
bool restore_loglevel = false;
1742
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1743
messages about the network interface to mess up the prompt */
1744
ret_linux = klogctl(8, NULL, 5);
1745
if(ret_linux == -1){
1746
perror_plus("klogctl");
1748
restore_loglevel = true;
1751
#endif /* __linux__ */
1752
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1753
ioctl_errno = errno;
1755
if(restore_loglevel){
1756
ret_linux = klogctl(7, NULL, 0);
1757
if(ret_linux == -1){
1758
perror_plus("klogctl");
1761
#endif /* __linux__ */
1763
/* If raise_privileges() succeeded above */
1765
/* Lower privileges */
1766
ret_errno = lower_privileges();
1769
perror_plus("Failed to lower privileges");
1773
/* Close the socket */
1774
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1776
perror_plus("close");
1779
if(ret_setflags == -1){
1780
errno = ioctl_errno;
1781
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1786
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1790
/* Sleep checking until interface is running.
1791
Check every 0.25s, up to total time of delay */
1792
for(int i=0; i < delay * 4; i++){
1793
if(interface_is_running(interface)){
1796
struct timespec sleeptime = { .tv_nsec = 250000000 };
1797
ret = nanosleep(&sleeptime, NULL);
1798
if(ret == -1 and errno != EINTR){
1799
perror_plus("nanosleep");
1807
__attribute__((nonnull, warn_unused_result))
1808
error_t take_down_interface(const char *const interface){
1809
error_t old_errno = errno;
1810
struct ifreq network;
1811
unsigned int if_index = if_nametoindex(interface);
1813
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1817
if(interface_is_up(interface)){
1818
error_t ret_errno = 0, ioctl_errno = 0;
1819
if(not get_flags(interface, &network) and debug){
1821
fprintf_plus(stderr, "Failed to get flags for interface "
1822
"\"%s\"\n", interface);
1826
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1828
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1831
perror_plus("socket");
1837
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1841
/* Raise privileges */
1842
ret_errno = raise_privileges();
1844
perror_plus("Failed to raise privileges");
1847
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1848
ioctl_errno = errno;
1850
/* If raise_privileges() succeeded above */
1852
/* Lower privileges */
1853
ret_errno = lower_privileges();
1856
perror_plus("Failed to lower privileges");
1860
/* Close the socket */
1861
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1863
perror_plus("close");
1866
if(ret_setflags == -1){
1867
errno = ioctl_errno;
1868
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1873
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
1881
int main(int argc, char *argv[]){
1882
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1883
.priority = "SECURE256:!CTYPE-X.509:"
1884
"+CTYPE-OPENPGP", .current_server = NULL,
1885
.interfaces = NULL, .interfaces_size = 0 };
1886
AvahiSServiceBrowser *sb = NULL;
752
int ret = asprintf(&tmp, "%s/%s", first, second);
760
int main(int argc, char *argv[]){
761
AvahiSServiceBrowser *sb = NULL;
764
int exitcode = EXIT_SUCCESS;
765
const char *interface = "eth0";
766
struct ifreq network;
770
char *connect_to = NULL;
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
786
.doc = "Connect directly to a sepcified mandos server",
788
{ .name = "interface", .key = 'i',
790
.doc = "Interface that Avahi will conntect through",
792
{ .name = "keydir", .key = 'd',
794
.doc = "Directory where the openpgp keyring is",
796
{ .name = "seckey", .key = 's',
798
.doc = "Secret openpgp key for gnutls authentication",
800
{ .name = "pubkey", .key = 'p',
802
.doc = "Public openpgp key for gnutls authentication",
804
{ .name = "dh-bits", .key = 129,
806
.doc = "dh-bits to use in gnutls communication",
808
{ .name = "priority", .key = 130,
810
.doc = "GNUTLS priority", .group = 1 },
815
error_t parse_opt (int key, char *arg,
816
struct argp_state *state) {
817
/* Get the INPUT argument from `argp_parse', which we know is
818
a pointer to our plugin list pointer. */
840
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
854
return ARGP_ERR_UNKNOWN;
859
struct argp argp = { .options = options, .parser = parse_opt,
861
.doc = "Mandos client -- Get and decrypt"
862
" passwords from mandos server" };
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
873
perror("combinepath");
874
exitcode = EXIT_FAILURE;
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
891
gnutls_initalized = true;
894
/* If the interface is down, bring it up */
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
exitcode = EXIT_FAILURE;
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
934
if_index = (AvahiIfIndex) if_nametoindex(interface);
936
fprintf(stderr, "No such interface: \"%s\"\n", interface);
940
if(connect_to != NULL){
941
/* Connect directly, do not use Zeroconf */
942
/* (Mainly meant for debugging) */
943
char *address = strrchr(connect_to, ':');
945
fprintf(stderr, "No colon in address\n");
946
exitcode = EXIT_FAILURE;
1891
int exitcode = EXIT_SUCCESS;
1892
char *interfaces_to_take_down = NULL;
1893
size_t interfaces_to_take_down_size = 0;
1894
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1895
char old_tempdir[] = "/tmp/mandosXXXXXX";
1896
char *tempdir = NULL;
1897
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1898
const char *seckey = PATHDIR "/" SECKEY;
1899
const char *pubkey = PATHDIR "/" PUBKEY;
1900
char *interfaces_hooks = NULL;
1902
bool gnutls_initialized = false;
1903
bool gpgme_initialized = false;
1905
double retry_interval = 10; /* 10s between trying a server and
1906
retrying the same server again */
1908
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1909
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1914
/* Lower any group privileges we might have, just to be safe */
1918
perror_plus("setgid");
1921
/* Lower user privileges (temporarily) */
1925
perror_plus("seteuid");
1933
struct argp_option options[] = {
1934
{ .name = "debug", .key = 128,
1935
.doc = "Debug mode", .group = 3 },
1936
{ .name = "connect", .key = 'c',
1937
.arg = "ADDRESS:PORT",
1938
.doc = "Connect directly to a specific Mandos server",
1940
{ .name = "interface", .key = 'i',
1942
.doc = "Network interface that will be used to search for"
1945
{ .name = "seckey", .key = 's',
1947
.doc = "OpenPGP secret key file base name",
1949
{ .name = "pubkey", .key = 'p',
1951
.doc = "OpenPGP public key file base name",
1953
{ .name = "dh-bits", .key = 129,
1955
.doc = "Bit length of the prime number used in the"
1956
" Diffie-Hellman key exchange",
1958
{ .name = "priority", .key = 130,
1960
.doc = "GnuTLS priority string for the TLS handshake",
1962
{ .name = "delay", .key = 131,
1964
.doc = "Maximum delay to wait for interface startup",
1966
{ .name = "retry", .key = 132,
1968
.doc = "Retry interval used when denied by the Mandos server",
1970
{ .name = "network-hook-dir", .key = 133,
1972
.doc = "Directory where network hooks are located",
1975
* These reproduce what we would get without ARGP_NO_HELP
1977
{ .name = "help", .key = '?',
1978
.doc = "Give this help list", .group = -1 },
1979
{ .name = "usage", .key = -3,
1980
.doc = "Give a short usage message", .group = -1 },
1981
{ .name = "version", .key = 'V',
1982
.doc = "Print program version", .group = -1 },
1986
error_t parse_opt(int key, char *arg,
1987
struct argp_state *state){
950
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
952
perror("Bad port number");
953
exitcode = EXIT_FAILURE;
1990
case 128: /* --debug */
1993
case 'c': /* --connect */
1996
case 'i': /* --interface */
1997
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2000
argp_error(state, "%s", strerror(ret_errno));
2003
case 's': /* --seckey */
2006
case 'p': /* --pubkey */
2009
case 129: /* --dh-bits */
2011
tmpmax = strtoimax(arg, &tmp, 10);
2012
if(errno != 0 or tmp == arg or *tmp != '\0'
2013
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2014
argp_error(state, "Bad number of DH bits");
2016
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2018
case 130: /* --priority */
2021
case 131: /* --delay */
2023
delay = strtof(arg, &tmp);
2024
if(errno != 0 or tmp == arg or *tmp != '\0'){
2025
argp_error(state, "Bad delay");
2027
case 132: /* --retry */
2029
retry_interval = strtod(arg, &tmp);
2030
if(errno != 0 or tmp == arg or *tmp != '\0'
2031
or (retry_interval * 1000) > INT_MAX
2032
or retry_interval < 0){
2033
argp_error(state, "Bad retry interval");
2036
case 133: /* --network-hook-dir */
2040
* These reproduce what we would get without ARGP_NO_HELP
2042
case '?': /* --help */
2043
argp_state_help(state, state->out_stream,
2044
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2045
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2046
case -3: /* --usage */
2047
argp_state_help(state, state->out_stream,
2048
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2049
case 'V': /* --version */
2050
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2051
exit(argp_err_exit_status);
2054
return ARGP_ERR_UNKNOWN;
2059
struct argp argp = { .options = options, .parser = parse_opt,
2061
.doc = "Mandos client -- Get and decrypt"
2062
" passwords from a Mandos server" };
2063
ret = argp_parse(&argp, argc, argv,
2064
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2071
perror_plus("argp_parse");
2072
exitcode = EX_OSERR;
2075
exitcode = EX_USAGE;
2081
/* Work around Debian bug #633582:
2082
<http://bugs.debian.org/633582> */
2084
/* Re-raise privileges */
2085
ret_errno = raise_privileges();
2088
perror_plus("Failed to raise privileges");
2092
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2093
int seckey_fd = open(seckey, O_RDONLY);
2094
if(seckey_fd == -1){
2095
perror_plus("open");
2097
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2099
perror_plus("fstat");
2101
if(S_ISREG(st.st_mode)
2102
and st.st_uid == 0 and st.st_gid == 0){
2103
ret = fchown(seckey_fd, uid, gid);
2105
perror_plus("fchown");
2109
TEMP_FAILURE_RETRY(close(seckey_fd));
2113
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2114
int pubkey_fd = open(pubkey, O_RDONLY);
2115
if(pubkey_fd == -1){
2116
perror_plus("open");
2118
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2120
perror_plus("fstat");
2122
if(S_ISREG(st.st_mode)
2123
and st.st_uid == 0 and st.st_gid == 0){
2124
ret = fchown(pubkey_fd, uid, gid);
2126
perror_plus("fchown");
2130
TEMP_FAILURE_RETRY(close(pubkey_fd));
2134
/* Lower privileges */
2135
ret_errno = lower_privileges();
2138
perror_plus("Failed to lower privileges");
2143
/* Remove invalid interface names (except "none") */
2145
char *interface = NULL;
2146
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2148
if(strcmp(interface, "none") != 0
2149
and if_nametoindex(interface) == 0){
2150
if(interface[0] != '\0'){
2151
fprintf_plus(stderr, "Not using nonexisting interface"
2152
" \"%s\"\n", interface);
2154
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2160
/* Run network hooks */
2162
if(mc.interfaces != NULL){
2163
interfaces_hooks = malloc(mc.interfaces_size);
2164
if(interfaces_hooks == NULL){
2165
perror_plus("malloc");
957
address = connect_to;
958
ret = start_mandos_communication(address, port, if_index, &mc);
960
exitcode = EXIT_FAILURE;
962
exitcode = EXIT_SUCCESS;
968
avahi_set_log_function(empty_log);
971
/* Initialize the pseudo-RNG for Avahi */
972
srand((unsigned int) time(NULL));
974
/* Allocate main Avahi loop object */
975
mc.simple_poll = avahi_simple_poll_new();
976
if (mc.simple_poll == NULL) {
977
fprintf(stderr, "Avahi: Failed to create simple poll"
979
exitcode = EXIT_FAILURE;
984
AvahiServerConfig config;
985
/* Do not publish any local Zeroconf records */
986
avahi_server_config_init(&config);
987
config.publish_hinfo = 0;
988
config.publish_addresses = 0;
989
config.publish_workstation = 0;
990
config.publish_domain = 0;
992
/* Allocate a new server */
993
mc.server = avahi_server_new(avahi_simple_poll_get
994
(mc.simple_poll), &config, NULL,
997
/* Free the Avahi configuration data */
998
avahi_server_config_free(&config);
1001
/* Check if creating the Avahi server object succeeded */
1002
if (mc.server == NULL) {
1003
fprintf(stderr, "Failed to create Avahi server: %s\n",
1004
avahi_strerror(error));
1005
exitcode = EXIT_FAILURE;
1009
/* Create the Avahi service browser */
1010
sb = avahi_s_service_browser_new(mc.server, if_index,
1012
"_mandos._tcp", NULL, 0,
1013
browse_callback, &mc);
1015
fprintf(stderr, "Failed to create service browser: %s\n",
1016
avahi_strerror(avahi_server_errno(mc.server)));
1017
exitcode = EXIT_FAILURE;
1021
/* Run the main loop */
1024
fprintf(stderr, "Starting Avahi loop search\n");
1027
avahi_simple_poll_loop(mc.simple_poll);
2168
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2169
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2171
run_network_hooks("start", interfaces_hooks != NULL ?
2172
interfaces_hooks : "", delay);
2176
avahi_set_log_function(empty_log);
2179
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2180
from the signal handler */
2181
/* Initialize the pseudo-RNG for Avahi */
2182
srand((unsigned int) time(NULL));
2183
simple_poll = avahi_simple_poll_new();
2184
if(simple_poll == NULL){
2185
fprintf_plus(stderr,
2186
"Avahi: Failed to create simple poll object.\n");
2187
exitcode = EX_UNAVAILABLE;
2191
sigemptyset(&sigterm_action.sa_mask);
2192
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2194
perror_plus("sigaddset");
2195
exitcode = EX_OSERR;
2198
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2200
perror_plus("sigaddset");
2201
exitcode = EX_OSERR;
2204
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2206
perror_plus("sigaddset");
2207
exitcode = EX_OSERR;
2210
/* Need to check if the handler is SIG_IGN before handling:
2211
| [[info:libc:Initial Signal Actions]] |
2212
| [[info:libc:Basic Signal Handling]] |
2214
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2216
perror_plus("sigaction");
2219
if(old_sigterm_action.sa_handler != SIG_IGN){
2220
ret = sigaction(SIGINT, &sigterm_action, NULL);
2222
perror_plus("sigaction");
2223
exitcode = EX_OSERR;
2227
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2229
perror_plus("sigaction");
2232
if(old_sigterm_action.sa_handler != SIG_IGN){
2233
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2235
perror_plus("sigaction");
2236
exitcode = EX_OSERR;
2240
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2242
perror_plus("sigaction");
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2254
/* If no interfaces were specified, make a list */
2255
if(mc.interfaces == NULL){
2256
struct dirent **direntries;
2257
/* Look for any good interfaces */
2258
ret = scandir(sys_class_net, &direntries, good_interface,
2261
/* Add all found interfaces to interfaces list */
2262
for(int i = 0; i < ret; ++i){
2263
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2264
direntries[i]->d_name);
2267
perror_plus("argz_add");
2271
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2272
direntries[i]->d_name);
2278
fprintf_plus(stderr, "Could not find a network interface\n");
2279
exitcode = EXIT_FAILURE;
2284
/* Bring up interfaces which are down, and remove any "none"s */
2286
char *interface = NULL;
2287
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2289
/* If interface name is "none", stop bringing up interfaces.
2290
Also remove all instances of "none" from the list */
2291
if(strcmp(interface, "none") == 0){
2292
argz_delete(&mc.interfaces, &mc.interfaces_size,
2295
while((interface = argz_next(mc.interfaces,
2296
mc.interfaces_size, interface))){
2297
if(strcmp(interface, "none") == 0){
2298
argz_delete(&mc.interfaces, &mc.interfaces_size,
2305
bool interface_was_up = interface_is_up(interface);
2306
errno = bring_up_interface(interface, delay);
2307
if(not interface_was_up){
2309
perror_plus("Failed to bring up interface");
2311
errno = argz_add(&interfaces_to_take_down,
2312
&interfaces_to_take_down_size,
2315
perror_plus("argz_add");
2320
if(debug and (interfaces_to_take_down == NULL)){
2321
fprintf_plus(stderr, "No interfaces were brought up\n");
2325
/* If we only got one interface, explicitly use only that one */
2326
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2328
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2331
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2338
ret = init_gnutls_global(pubkey, seckey, &mc);
2340
fprintf_plus(stderr, "init_gnutls_global failed\n");
2341
exitcode = EX_UNAVAILABLE;
2344
gnutls_initialized = true;
2351
/* Try /run/tmp before /tmp */
2352
tempdir = mkdtemp(run_tempdir);
2353
if(tempdir == NULL and errno == ENOENT){
2355
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2356
run_tempdir, old_tempdir);
2358
tempdir = mkdtemp(old_tempdir);
2360
if(tempdir == NULL){
2361
perror_plus("mkdtemp");
2369
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2370
fprintf_plus(stderr, "init_gpgme failed\n");
2371
exitcode = EX_UNAVAILABLE;
2374
gpgme_initialized = true;
2381
if(connect_to != NULL){
2382
/* Connect directly, do not use Zeroconf */
2383
/* (Mainly meant for debugging) */
2384
char *address = strrchr(connect_to, ':');
2386
if(address == NULL){
2387
fprintf_plus(stderr, "No colon in address\n");
2388
exitcode = EX_USAGE;
2398
tmpmax = strtoimax(address+1, &tmp, 10);
2399
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2400
or tmpmax != (in_port_t)tmpmax){
2401
fprintf_plus(stderr, "Bad port number\n");
2402
exitcode = EX_USAGE;
2410
port = (in_port_t)tmpmax;
2412
/* Colon in address indicates IPv6 */
2414
if(strchr(connect_to, ':') != NULL){
2416
/* Accept [] around IPv6 address - see RFC 5952 */
2417
if(connect_to[0] == '[' and address[-1] == ']')
2425
address = connect_to;
2431
while(not quit_now){
2432
ret = start_mandos_communication(address, port, if_index, af,
2434
if(quit_now or ret == 0){
2438
fprintf_plus(stderr, "Retrying in %d seconds\n",
2439
(int)retry_interval);
2441
sleep((unsigned int)retry_interval);
2445
exitcode = EXIT_SUCCESS;
2456
AvahiServerConfig config;
2457
/* Do not publish any local Zeroconf records */
2458
avahi_server_config_init(&config);
2459
config.publish_hinfo = 0;
2460
config.publish_addresses = 0;
2461
config.publish_workstation = 0;
2462
config.publish_domain = 0;
2464
/* Allocate a new server */
2465
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2466
&config, NULL, NULL, &ret_errno);
2468
/* Free the Avahi configuration data */
2469
avahi_server_config_free(&config);
2472
/* Check if creating the Avahi server object succeeded */
2473
if(mc.server == NULL){
2474
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2475
avahi_strerror(ret_errno));
2476
exitcode = EX_UNAVAILABLE;
2484
/* Create the Avahi service browser */
2485
sb = avahi_s_service_browser_new(mc.server, if_index,
2486
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2487
NULL, 0, browse_callback,
2490
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2491
avahi_strerror(avahi_server_errno(mc.server)));
2492
exitcode = EX_UNAVAILABLE;
2500
/* Run the main loop */
2503
fprintf_plus(stderr, "Starting Avahi loop search\n");
2506
ret = avahi_loop_with_timeout(simple_poll,
2507
(int)(retry_interval * 1000), &mc);
2509
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2510
(ret == 0) ? "successfully" : "with error");
1032
fprintf(stderr, "%s exiting\n", argv[0]);
1035
/* Cleanup things */
1037
avahi_s_service_browser_free(sb);
1039
if (mc.server != NULL)
1040
avahi_server_free(mc.server);
1042
if (mc.simple_poll != NULL)
1043
avahi_simple_poll_free(mc.simple_poll);
1044
free(pubkeyfilename);
1045
free(seckeyfilename);
1047
if (gnutls_initalized){
1048
gnutls_certificate_free_credentials(mc.cred);
1049
gnutls_global_deinit ();
2516
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2519
/* Cleanup things */
2520
free(mc.interfaces);
2523
avahi_s_service_browser_free(sb);
2525
if(mc.server != NULL)
2526
avahi_server_free(mc.server);
2528
if(simple_poll != NULL)
2529
avahi_simple_poll_free(simple_poll);
2531
if(gnutls_initialized){
2532
gnutls_certificate_free_credentials(mc.cred);
2533
gnutls_global_deinit();
2534
gnutls_dh_params_deinit(mc.dh_params);
2537
if(gpgme_initialized){
2538
gpgme_release(mc.ctx);
2541
/* Cleans up the circular linked list of Mandos servers the client
2543
if(mc.current_server != NULL){
2544
mc.current_server->prev->next = NULL;
2545
while(mc.current_server != NULL){
2546
server *next = mc.current_server->next;
2547
free(mc.current_server);
2548
mc.current_server = next;
2552
/* Re-raise privileges */
2554
ret_errno = raise_privileges();
2556
perror_plus("Failed to raise privileges");
2559
/* Run network hooks */
2560
run_network_hooks("stop", interfaces_hooks != NULL ?
2561
interfaces_hooks : "", delay);
2563
/* Take down the network interfaces which were brought up */
2565
char *interface = NULL;
2566
while((interface=argz_next(interfaces_to_take_down,
2567
interfaces_to_take_down_size,
2569
ret_errno = take_down_interface(interface);
2572
perror_plus("Failed to take down interface");
2575
if(debug and (interfaces_to_take_down == NULL)){
2576
fprintf_plus(stderr, "No interfaces needed to be taken"
2582
ret_errno = lower_privileges_permanently();
2584
perror_plus("Failed to lower privileges permanently");
2588
free(interfaces_to_take_down);
2589
free(interfaces_hooks);
2591
/* Removes the GPGME temp directory and all files inside */
2592
if(tempdir != NULL){
2593
struct dirent **direntries = NULL;
2594
int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY));
2595
if(tempdir_fd == -1){
2596
perror_plus("open");
2599
#if __GLIBC_PREREQ(2, 15)
2600
int numentries = scandirat(tempdir_fd, ".", &direntries,
2601
notdotentries, alphasort);
2602
#else /* not __GLIBC_PREREQ(2, 15) */
2603
int numentries = scandir(tempdir, &direntries, notdotentries,
2605
#endif /* not __GLIBC_PREREQ(2, 15) */
2606
#else /* not __GLIBC__ */
2607
int numentries = scandir(tempdir, &direntries, notdotentries,
2609
#endif /* not __GLIBC__ */
2611
for(int i = 0; i < numentries; i++){
2612
ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);
2614
fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"
2615
" \"%s\", 0): %s\n", tempdir,
2616
direntries[i]->d_name, strerror(errno));
2620
/* need to clean even if 0 because man page doesn't specify */
2622
if(numentries == -1){
2623
perror_plus("scandir");
2625
ret = rmdir(tempdir);
2626
if(ret == -1 and errno != ENOENT){
2627
perror_plus("rmdir");
2630
TEMP_FAILURE_RETRY(close(tempdir_fd));
2635
sigemptyset(&old_sigterm_action.sa_mask);
2636
old_sigterm_action.sa_handler = SIG_DFL;
2637
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2638
&old_sigterm_action,
2641
perror_plus("sigaction");
2644
ret = raise(signal_received);
2645
} while(ret != 0 and errno == EINTR);
2647
perror_plus("raise");
2650
TEMP_FAILURE_RETRY(pause());