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;
148
/* Doubly linked list that need to be circularly linked when used */
149
typedef struct server{
152
AvahiIfIndex if_index;
154
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>";
159
105
/* Used for passing in values through the Avahi callback functions */
107
AvahiSimplePoll *simple_poll;
161
108
AvahiServer *server;
162
109
gnutls_certificate_credentials_t cred;
163
110
unsigned int dh_bits;
164
111
gnutls_dh_params_t dh_params;
165
112
const char *priority;
167
server *current_server;
169
size_t interfaces_size;
170
113
} mandos_context;
172
/* global so signal handler can reach it*/
173
AvahiSimplePoll *simple_poll;
175
sig_atomic_t quit_now = 0;
176
int signal_received = 0;
178
/* Function to use when printing errors */
179
void perror_plus(const char *print_text){
181
fprintf(stderr, "Mandos plugin %s: ",
182
program_invocation_short_name);
187
__attribute__((format (gnu_printf, 2, 3), nonnull))
188
int fprintf_plus(FILE *stream, const char *format, ...){
190
va_start (ap, format);
192
TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",
193
program_invocation_short_name));
194
return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));
198
* Make additional room in "buffer" for at least BUFFER_SIZE more
199
* 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,
200
118
* "buffer_length" is how much is already used.
202
__attribute__((nonnull, warn_unused_result))
203
size_t incbuffer(char **buffer, size_t buffer_length,
204
size_t buffer_capacity){
205
if(buffer_length + BUFFER_SIZE > buffer_capacity){
206
char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
208
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);
215
127
buffer_capacity += BUFFER_SIZE;
217
129
return buffer_capacity;
220
/* Add server to set of servers to retry periodically */
221
__attribute__((nonnull, warn_unused_result))
222
bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,
223
int af, server **current_server){
225
server *new_server = malloc(sizeof(server));
226
if(new_server == NULL){
227
perror_plus("malloc");
230
*new_server = (server){ .ip = strdup(ip),
232
.if_index = if_index,
234
if(new_server->ip == NULL){
235
perror_plus("strdup");
238
ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));
240
perror_plus("clock_gettime");
243
/* Special case of first server */
244
if(*current_server == NULL){
245
new_server->next = new_server;
246
new_server->prev = new_server;
247
*current_server = new_server;
249
/* Place the new server last in the list */
250
new_server->next = *current_server;
251
new_server->prev = (*current_server)->prev;
252
new_server->prev->next = new_server;
253
(*current_server)->prev = new_server;
133
* Decrypt OpenPGP data using keyrings in HOMEDIR.
134
* Returns -1 on error
261
__attribute__((nonnull, warn_unused_result))
262
static bool init_gpgme(const char * const seckey,
263
const char * const pubkey,
264
const char * const tempdir,
136
static ssize_t pgp_packet_decrypt (const char *cryptotext,
139
const char *homedir){
140
gpgme_data_t dh_crypto, dh_plain;
266
142
gpgme_error_t rc;
144
size_t plaintext_capacity = 0;
145
ssize_t plaintext_length = 0;
267
146
gpgme_engine_info_t engine_info;
270
* Helper function to insert pub and seckey to the engine keyring.
272
bool import_key(const char * const filename){
275
gpgme_data_t pgp_data;
277
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
283
rc = gpgme_data_new_from_fd(&pgp_data, fd);
284
if(rc != GPG_ERR_NO_ERROR){
285
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
286
gpgme_strsource(rc), gpgme_strerror(rc));
290
rc = gpgme_op_import(mc->ctx, pgp_data);
291
if(rc != GPG_ERR_NO_ERROR){
292
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
293
gpgme_strsource(rc), gpgme_strerror(rc));
297
ret = (int)TEMP_FAILURE_RETRY(close(fd));
299
perror_plus("close");
301
gpgme_data_release(pgp_data);
306
fprintf_plus(stderr, "Initializing GPGME\n");
149
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
310
153
gpgme_check_version(NULL);
311
154
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
312
if(rc != GPG_ERR_NO_ERROR){
313
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
314
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));
318
161
/* Set GPGME home directory for the OpenPGP engine only */
319
rc = gpgme_get_engine_info(&engine_info);
320
if(rc != GPG_ERR_NO_ERROR){
321
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
322
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));
325
168
while(engine_info != NULL){
326
169
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
327
170
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
328
engine_info->file_name, tempdir);
171
engine_info->file_name, homedir);
331
174
engine_info = engine_info->next;
333
176
if(engine_info == NULL){
334
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
339
/* Create new GPGME "context" */
340
rc = gpgme_new(&(mc->ctx));
341
if(rc != GPG_ERR_NO_ERROR){
342
fprintf_plus(stderr, "Mandos plugin mandos-client: "
343
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
348
if(not import_key(pubkey) or not import_key(seckey)){
356
* Decrypt OpenPGP data.
357
* Returns -1 on error
359
__attribute__((nonnull, warn_unused_result))
360
static ssize_t pgp_packet_decrypt(const char *cryptotext,
364
gpgme_data_t dh_crypto, dh_plain;
367
size_t plaintext_capacity = 0;
368
ssize_t plaintext_length = 0;
371
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
177
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
374
181
/* Create new GPGME data buffer from memory cryptotext */
375
182
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
377
if(rc != GPG_ERR_NO_ERROR){
378
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
379
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));
383
190
/* Create new empty GPGME data buffer for the plaintext */
384
191
rc = gpgme_data_new(&dh_plain);
385
if(rc != GPG_ERR_NO_ERROR){
386
fprintf_plus(stderr, "Mandos plugin mandos-client: "
387
"bad gpgme_data_new: %s: %s\n",
388
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));
389
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;
393
208
/* Decrypt data from the cryptotext data buffer to the plaintext
395
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
396
if(rc != GPG_ERR_NO_ERROR){
397
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
398
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));
399
214
plaintext_length = -1;
401
gpgme_decrypt_result_t result;
402
result = gpgme_op_decrypt_result(mc->ctx);
404
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
406
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
407
result->unsupported_algorithm);
408
fprintf_plus(stderr, "Wrong key usage: %u\n",
409
result->wrong_key_usage);
410
if(result->file_name != NULL){
411
fprintf_plus(stderr, "File name: %s\n", result->file_name);
413
gpgme_recipient_t recipient;
414
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;
415
238
while(recipient != NULL){
416
fprintf_plus(stderr, "Public key algorithm: %s\n",
417
gpgme_pubkey_algo_name
418
(recipient->pubkey_algo));
419
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
420
fprintf_plus(stderr, "Secret key available: %s\n",
421
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
423
245
recipient = recipient->next;
431
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
434
251
/* Seek back to the beginning of the GPGME plaintext data buffer */
435
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
436
perror_plus("gpgme_data_seek");
252
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
253
perror("pgpme_data_seek");
437
254
plaintext_length = -1;
438
255
goto decrypt_end;
441
258
*plaintext = NULL;
443
plaintext_capacity = incbuffer(plaintext,
444
(size_t)plaintext_length,
446
if(plaintext_capacity == 0){
447
perror_plus("incbuffer");
448
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;
452
269
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
454
271
/* Print the data, if any */
460
perror_plus("gpgme_data_read");
277
perror("gpgme_data_read");
461
278
plaintext_length = -1;
462
279
goto decrypt_end;
464
281
plaintext_length += ret;
468
fprintf_plus(stderr, "Decrypted password is: ");
285
fprintf(stderr, "Decrypted password is: ");
469
286
for(ssize_t i = 0; i < plaintext_length; i++){
470
287
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
640
433
__attribute__((unused)) const char *txt){}
642
435
/* Called when a Mandos server is found */
643
__attribute__((nonnull, warn_unused_result))
644
static int start_mandos_communication(const char *ip, in_port_t port,
436
static int start_mandos_communication(const char *ip, uint16_t port,
645
437
AvahiIfIndex if_index,
646
int af, mandos_context *mc){
647
int ret, tcp_sd = -1;
649
struct sockaddr_storage to;
440
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
650
441
char *buffer = NULL;
651
char *decrypted_buffer = NULL;
442
char *decrypted_buffer;
652
443
size_t buffer_length = 0;
653
444
size_t buffer_capacity = 0;
445
ssize_t decrypted_buffer_size;
448
char interface[IF_NAMESIZE];
656
449
gnutls_session_t session;
657
int pf; /* Protocol family */
674
fprintf_plus(stderr, "Bad address family: %d\n", af);
679
/* If the interface is specified and we have a list of interfaces */
680
if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){
681
/* Check if the interface is one of the interfaces we are using */
684
char *interface = NULL;
685
while((interface=argz_next(mc->interfaces, mc->interfaces_size,
687
if(if_nametoindex(interface) == (unsigned int)if_index){
694
/* This interface does not match any in the list, so we don't
695
connect to the server */
697
char interface[IF_NAMESIZE];
698
if(if_indextoname((unsigned int)if_index, interface) == NULL){
699
perror_plus("if_indextoname");
701
fprintf_plus(stderr, "Skipping server on non-used interface"
703
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);
711
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);
717
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
718
PRIuMAX "\n", ip, (uintmax_t)port);
721
tcp_sd = socket(pf, SOCK_STREAM, 0);
724
perror_plus("socket");
734
memset(&to, 0, sizeof(to));
736
((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;
737
ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);
739
((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;
740
ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);
744
perror_plus("inet_pton");
750
fprintf_plus(stderr, "Bad address: %s\n", ip);
755
((struct sockaddr_in6 *)&to)->sin6_port = htons(port);
756
if(IN6_IS_ADDR_LINKLOCAL
757
(&((struct sockaddr_in6 *)&to)->sin6_addr)){
758
if(if_index == AVAHI_IF_UNSPEC){
759
fprintf_plus(stderr, "An IPv6 link-local address is"
760
" incomplete without a network interface\n");
764
/* Set the network interface number as scope */
765
((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;
768
((struct sockaddr_in *)&to)->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;
777
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
778
char interface[IF_NAMESIZE];
779
if(if_indextoname((unsigned int)if_index, interface) == NULL){
780
perror_plus("if_indextoname");
782
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX
783
"\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);
786
fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",
787
ip, (uintmax_t)port);
789
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
790
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
792
ret = getnameinfo((struct sockaddr *)&to,
793
sizeof(struct sockaddr_in6),
794
addrstr, sizeof(addrstr), NULL, 0,
797
ret = getnameinfo((struct sockaddr *)&to,
798
sizeof(struct sockaddr_in),
799
addrstr, sizeof(addrstr), NULL, 0,
802
if(ret == EAI_SYSTEM){
803
perror_plus("getnameinfo");
804
} else if(ret != 0) {
805
fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));
806
} else if(strcmp(addrstr, ip) != 0){
807
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
817
ret = connect(tcp_sd, (struct sockaddr *)&to,
818
sizeof(struct sockaddr_in6));
820
ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */
821
sizeof(struct sockaddr_in));
824
if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
826
perror_plus("connect");
506
ret = connect(tcp_sd, &to.in, sizeof(to));
837
512
const char *out = mandos_protocol_version;
840
515
size_t out_size = strlen(out);
841
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
842
out_size - written));
845
perror_plus("write");
516
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
517
out_size - written));
849
523
written += (size_t)ret;
850
524
if(written < out_size){
853
if(out == mandos_protocol_version){
527
if (out == mandos_protocol_version){
868
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
876
/* This casting via intptr_t is to eliminate warning about casting
877
an int to a pointer type. This is exactly how the GnuTLS Guile
878
function "set-session-transport-fd!" does it. */
879
gnutls_transport_set_ptr(session,
880
(gnutls_transport_ptr_t)(intptr_t)tcp_sd);
888
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);
893
544
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
895
if(ret != GNUTLS_E_SUCCESS){
546
if (ret != GNUTLS_E_SUCCESS){
897
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
548
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
904
555
/* Read OpenPGP packet that contains the wanted password */
907
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
558
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
918
buffer_capacity = incbuffer(&buffer, buffer_length,
920
if(buffer_capacity == 0){
922
perror_plus("incbuffer");
932
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,
939
578
case GNUTLS_E_INTERRUPTED:
940
579
case GNUTLS_E_AGAIN:
942
581
case GNUTLS_E_REHANDSHAKE:
944
ret = gnutls_handshake(session);
583
ret = gnutls_handshake (session);
950
584
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
952
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
586
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
960
fprintf_plus(stderr, "Unknown error while reading data from"
961
" encrypted session with Mandos server\n");
962
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);
967
buffer_length += (size_t) sret;
600
buffer_length += (size_t) ret;
972
fprintf_plus(stderr, "Closing TLS session\n");
981
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
986
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
988
if(buffer_length > 0){
989
ssize_t decrypted_buffer_size;
990
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
991
&decrypted_buffer, mc);
992
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){
995
617
while(written < (size_t) decrypted_buffer_size){
1001
ret = (int)fwrite(decrypted_buffer + written, 1,
1002
(size_t)decrypted_buffer_size - written,
618
ret = (int)fwrite (decrypted_buffer + written, 1,
619
(size_t)decrypted_buffer_size - written,
1004
621
if(ret == 0 and ferror(stdout)){
1007
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
623
fprintf(stderr, "Error writing encrypted data: %s\n",
1013
629
written += (size_t)ret;
631
free(decrypted_buffer);
1019
637
/* Shutdown procedure */
1024
free(decrypted_buffer);
1027
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
1033
perror_plus("close");
1035
gnutls_deinit(session);
642
gnutls_deinit (session);
1045
__attribute__((nonnull))
1046
646
static void resolve_callback(AvahiSServiceResolver *r,
1047
647
AvahiIfIndex interface,
1048
AvahiProtocol proto,
648
AVAHI_GCC_UNUSED AvahiProtocol protocol,
1049
649
AvahiResolverEvent event,
1050
650
const char *name,
1051
651
const char *type,
1159
734
case AVAHI_BROWSER_ALL_FOR_NOW:
1160
735
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1162
fprintf_plus(stderr, "No Mandos server found, still"
737
fprintf(stderr, "No Mandos server found, still searching...\n");
1169
/* Signal handler that stops main loop after SIGTERM */
1170
static void handle_sigterm(int sig){
1175
signal_received = sig;
1176
int old_errno = errno;
1177
/* set main loop to exit */
1178
if(simple_poll != NULL){
1179
avahi_simple_poll_quit(simple_poll);
1184
__attribute__((nonnull, warn_unused_result))
1185
bool get_flags(const char *ifname, struct ifreq *ifr){
1189
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1192
perror_plus("socket");
1196
strcpy(ifr->ifr_name, ifname);
1197
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1201
perror_plus("ioctl SIOCGIFFLAGS");
1209
__attribute__((nonnull, warn_unused_result))
1210
bool good_flags(const char *ifname, const struct ifreq *ifr){
1212
/* Reject the loopback device */
1213
if(ifr->ifr_flags & IFF_LOOPBACK){
1215
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1220
/* Accept point-to-point devices only if connect_to is specified */
1221
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1223
fprintf_plus(stderr, "Accepting point-to-point interface"
1224
" \"%s\"\n", ifname);
1228
/* Otherwise, reject non-broadcast-capable devices */
1229
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1231
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1232
" \"%s\"\n", ifname);
1236
/* Reject non-ARP interfaces (including dummy interfaces) */
1237
if(ifr->ifr_flags & IFF_NOARP){
1239
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1245
/* Accept this device */
1247
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1253
* This function determines if a directory entry in /sys/class/net
1254
* corresponds to an acceptable network device.
1255
* (This function is passed to scandir(3) as a filter function.)
1257
__attribute__((nonnull, warn_unused_result))
1258
int good_interface(const struct dirent *if_entry){
1259
if(if_entry->d_name[0] == '.'){
1264
if(not get_flags(if_entry->d_name, &ifr)){
1266
fprintf_plus(stderr, "Failed to get flags for interface "
1267
"\"%s\"\n", if_entry->d_name);
1272
if(not good_flags(if_entry->d_name, &ifr)){
1279
* This function determines if a network interface is up.
1281
__attribute__((nonnull, warn_unused_result))
1282
bool interface_is_up(const char *interface){
1284
if(not get_flags(interface, &ifr)){
1286
fprintf_plus(stderr, "Failed to get flags for interface "
1287
"\"%s\"\n", interface);
1292
return (bool)(ifr.ifr_flags & IFF_UP);
1296
* This function determines if a network interface is running
1298
__attribute__((nonnull, warn_unused_result))
1299
bool interface_is_running(const char *interface){
1301
if(not get_flags(interface, &ifr)){
1303
fprintf_plus(stderr, "Failed to get flags for interface "
1304
"\"%s\"\n", interface);
1309
return (bool)(ifr.ifr_flags & IFF_RUNNING);
1312
__attribute__((nonnull, pure, warn_unused_result))
1313
int notdotentries(const struct dirent *direntry){
1314
/* Skip "." and ".." */
1315
if(direntry->d_name[0] == '.'
1316
and (direntry->d_name[1] == '\0'
1317
or (direntry->d_name[1] == '.'
1318
and direntry->d_name[2] == '\0'))){
1324
/* Is this directory entry a runnable program? */
1325
__attribute__((nonnull, warn_unused_result))
1326
int runnable_hook(const struct dirent *direntry){
1331
if((direntry->d_name)[0] == '\0'){
1336
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1337
"abcdefghijklmnopqrstuvwxyz"
1340
if((direntry->d_name)[sret] != '\0'){
1341
/* Contains non-allowed characters */
1343
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1349
ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);
1352
perror_plus("Could not stat hook");
1356
if(not (S_ISREG(st.st_mode))){
1357
/* Not a regular file */
1359
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1364
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1365
/* Not executable */
1367
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1373
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1379
__attribute__((nonnull, warn_unused_result))
1380
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,
1381
mandos_context *mc){
1383
struct timespec now;
1384
struct timespec waited_time;
1385
intmax_t block_time;
1388
if(mc->current_server == NULL){
1390
fprintf_plus(stderr, "Wait until first server is found."
1393
ret = avahi_simple_poll_iterate(s, -1);
1396
fprintf_plus(stderr, "Check current_server if we should run"
1399
/* the current time */
1400
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1402
perror_plus("clock_gettime");
1405
/* Calculating in ms how long time between now and server
1406
who we visted longest time ago. Now - last seen. */
1407
waited_time.tv_sec = (now.tv_sec
1408
- mc->current_server->last_seen.tv_sec);
1409
waited_time.tv_nsec = (now.tv_nsec
1410
- mc->current_server->last_seen.tv_nsec);
1411
/* total time is 10s/10,000ms.
1412
Converting to s from ms by dividing by 1,000,
1413
and ns to ms by dividing by 1,000,000. */
1414
block_time = ((retry_interval
1415
- ((intmax_t)waited_time.tv_sec * 1000))
1416
- ((intmax_t)waited_time.tv_nsec / 1000000));
1419
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1423
if(block_time <= 0){
1424
ret = start_mandos_communication(mc->current_server->ip,
1425
mc->current_server->port,
1426
mc->current_server->if_index,
1427
mc->current_server->af, mc);
1429
avahi_simple_poll_quit(s);
1432
ret = clock_gettime(CLOCK_MONOTONIC,
1433
&mc->current_server->last_seen);
1435
perror_plus("clock_gettime");
1438
mc->current_server = mc->current_server->next;
1439
block_time = 0; /* Call avahi to find new Mandos
1440
servers, but don't block */
1443
ret = avahi_simple_poll_iterate(s, (int)block_time);
1446
if(ret > 0 or errno != EINTR){
1447
return (ret != 1) ? ret : 0;
1453
/* Set effective uid to 0, return errno */
1454
__attribute__((warn_unused_result))
1455
error_t raise_privileges(void){
1456
error_t old_errno = errno;
1457
error_t ret_errno = 0;
1458
if(seteuid(0) == -1){
1460
perror_plus("seteuid");
1466
/* Set effective and real user ID to 0. Return errno. */
1467
__attribute__((warn_unused_result))
1468
error_t raise_privileges_permanently(void){
1469
error_t old_errno = errno;
1470
error_t ret_errno = raise_privileges();
1475
if(setuid(0) == -1){
1477
perror_plus("seteuid");
1483
/* Set effective user ID to unprivileged saved user ID */
1484
__attribute__((warn_unused_result))
1485
error_t lower_privileges(void){
1486
error_t old_errno = errno;
1487
error_t ret_errno = 0;
1488
if(seteuid(uid) == -1){
1490
perror_plus("seteuid");
1496
/* Lower privileges permanently */
1497
__attribute__((warn_unused_result))
1498
error_t lower_privileges_permanently(void){
1499
error_t old_errno = errno;
1500
error_t ret_errno = 0;
1501
if(setuid(uid) == -1){
1503
perror_plus("setuid");
1511
* Based on the example in the GNU LibC manual chapter 13.13 "File
1512
* Descriptor Flags".
1513
| [[info:libc:Descriptor%20Flags][File Descriptor Flags]] |
1515
__attribute__((warn_unused_result))
1516
static int set_cloexec_flag(int fd){
1517
int ret = (int)TEMP_FAILURE_RETRY(fcntl(fd, F_GETFD, 0));
1518
/* If reading the flags failed, return error indication now. */
1522
/* Store modified flag word in the descriptor. */
1523
return (int)TEMP_FAILURE_RETRY(fcntl(fd, F_SETFD,
1526
#endif /* not O_CLOEXEC */
1528
__attribute__((nonnull))
1529
void run_network_hooks(const char *mode, const char *interface,
1531
struct dirent **direntries;
1532
if(hookdir_fd == -1){
1533
hookdir_fd = open(hookdir, O_RDONLY |
1536
#else /* not O_CLOEXEC */
1538
#endif /* not O_CLOEXEC */
1540
if(hookdir_fd == -1){
1541
if(errno == ENOENT){
1543
fprintf_plus(stderr, "Network hook directory \"%s\" not"
1544
" found\n", hookdir);
1547
perror_plus("open");
1552
if(set_cloexec_flag(hookdir_fd) < 0){
1553
perror_plus("set_cloexec_flag");
1554
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1555
perror_plus("close");
1561
#endif /* not O_CLOEXEC */
1564
#if __GLIBC_PREREQ(2, 15)
1565
int numhooks = scandirat(hookdir_fd, ".", &direntries,
1566
runnable_hook, alphasort);
1567
#else /* not __GLIBC_PREREQ(2, 15) */
1568
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1570
#endif /* not __GLIBC_PREREQ(2, 15) */
1571
#else /* not __GLIBC__ */
1572
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1574
#endif /* not __GLIBC__ */
1576
perror_plus("scandir");
1579
struct dirent *direntry;
1581
int devnull = open("/dev/null", O_RDONLY);
1582
for(int i = 0; i < numhooks; i++){
1583
direntry = direntries[i];
1585
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1588
pid_t hook_pid = fork();
1591
/* Raise privileges */
1592
if(raise_privileges_permanently() != 0){
1593
perror_plus("Failed to raise privileges");
1600
perror_plus("setgid");
1603
/* Reset supplementary groups */
1605
ret = setgroups(0, NULL);
1607
perror_plus("setgroups");
1610
ret = dup2(devnull, STDIN_FILENO);
1612
perror_plus("dup2(devnull, STDIN_FILENO)");
1615
ret = close(devnull);
1617
perror_plus("close");
1620
ret = dup2(STDERR_FILENO, STDOUT_FILENO);
1622
perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");
1625
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1627
perror_plus("setenv");
1630
ret = setenv("DEVICE", interface, 1);
1632
perror_plus("setenv");
1635
ret = setenv("VERBOSITY", debug ? "1" : "0", 1);
1637
perror_plus("setenv");
1640
ret = setenv("MODE", mode, 1);
1642
perror_plus("setenv");
1646
ret = asprintf(&delaystring, "%f", (double)delay);
1648
perror_plus("asprintf");
1651
ret = setenv("DELAY", delaystring, 1);
1654
perror_plus("setenv");
1658
if(connect_to != NULL){
1659
ret = setenv("CONNECT", connect_to, 1);
1661
perror_plus("setenv");
1665
if(fexecve(hookdir_fd, (char *const [])
1666
{ direntry->d_name, NULL }, environ) == -1){
1667
perror_plus("fexecve");
1668
_exit(EXIT_FAILURE);
1672
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1673
perror_plus("waitpid");
1676
if(WIFEXITED(status)){
1677
if(WEXITSTATUS(status) != 0){
1678
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1679
" with status %d\n", direntry->d_name,
1680
WEXITSTATUS(status));
1683
} else if(WIFSIGNALED(status)){
1684
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1685
" signal %d\n", direntry->d_name,
1689
fprintf_plus(stderr, "Warning: network hook \"%s\""
1690
" crashed\n", direntry->d_name);
1695
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
1699
if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){
1700
perror_plus("close");
1707
__attribute__((nonnull, warn_unused_result))
1708
error_t bring_up_interface(const char *const interface,
1710
error_t old_errno = errno;
1712
struct ifreq network;
1713
unsigned int if_index = if_nametoindex(interface);
1715
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1725
if(not interface_is_up(interface)){
1726
error_t ret_errno = 0, ioctl_errno = 0;
1727
if(not get_flags(interface, &network)){
1729
fprintf_plus(stderr, "Failed to get flags for interface "
1730
"\"%s\"\n", interface);
1734
network.ifr_flags |= IFF_UP; /* set flag */
1736
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1739
perror_plus("socket");
1745
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1747
perror_plus("close");
1754
fprintf_plus(stderr, "Bringing up interface \"%s\"\n",
1758
/* Raise privileges */
1759
ret_errno = raise_privileges();
1761
perror_plus("Failed to raise privileges");
1766
bool restore_loglevel = false;
1768
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1769
messages about the network interface to mess up the prompt */
1770
ret_linux = klogctl(8, NULL, 5);
1771
if(ret_linux == -1){
1772
perror_plus("klogctl");
1774
restore_loglevel = true;
1777
#endif /* __linux__ */
1778
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1779
ioctl_errno = errno;
1781
if(restore_loglevel){
1782
ret_linux = klogctl(7, NULL, 0);
1783
if(ret_linux == -1){
1784
perror_plus("klogctl");
1787
#endif /* __linux__ */
1789
/* If raise_privileges() succeeded above */
1791
/* Lower privileges */
1792
ret_errno = lower_privileges();
1795
perror_plus("Failed to lower privileges");
1799
/* Close the socket */
1800
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1802
perror_plus("close");
1805
if(ret_setflags == -1){
1806
errno = ioctl_errno;
1807
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1812
fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",
1816
/* Sleep checking until interface is running.
1817
Check every 0.25s, up to total time of delay */
1818
for(int i=0; i < delay * 4; i++){
1819
if(interface_is_running(interface)){
1822
struct timespec sleeptime = { .tv_nsec = 250000000 };
1823
ret = nanosleep(&sleeptime, NULL);
1824
if(ret == -1 and errno != EINTR){
1825
perror_plus("nanosleep");
1833
__attribute__((nonnull, warn_unused_result))
1834
error_t take_down_interface(const char *const interface){
1835
error_t old_errno = errno;
1836
struct ifreq network;
1837
unsigned int if_index = if_nametoindex(interface);
1839
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1843
if(interface_is_up(interface)){
1844
error_t ret_errno = 0, ioctl_errno = 0;
1845
if(not get_flags(interface, &network) and debug){
1847
fprintf_plus(stderr, "Failed to get flags for interface "
1848
"\"%s\"\n", interface);
1852
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
1854
int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1857
perror_plus("socket");
1863
fprintf_plus(stderr, "Taking down interface \"%s\"\n",
1867
/* Raise privileges */
1868
ret_errno = raise_privileges();
1870
perror_plus("Failed to raise privileges");
1873
int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);
1874
ioctl_errno = errno;
1876
/* If raise_privileges() succeeded above */
1878
/* Lower privileges */
1879
ret_errno = lower_privileges();
1882
perror_plus("Failed to lower privileges");
1886
/* Close the socket */
1887
int ret = (int)TEMP_FAILURE_RETRY(close(sd));
1889
perror_plus("close");
1892
if(ret_setflags == -1){
1893
errno = ioctl_errno;
1894
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
1899
fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",
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';
1907
764
int main(int argc, char *argv[]){
1908
mandos_context mc = { .server = NULL, .dh_bits = 1024,
1909
.priority = "SECURE256:!CTYPE-X.509:"
1910
"+CTYPE-OPENPGP", .current_server = NULL,
1911
.interfaces = NULL, .interfaces_size = 0 };
1912
AvahiSServiceBrowser *sb = NULL;
1917
int exitcode = EXIT_SUCCESS;
1918
char *interfaces_to_take_down = NULL;
1919
size_t interfaces_to_take_down_size = 0;
1920
char run_tempdir[] = "/run/tmp/mandosXXXXXX";
1921
char old_tempdir[] = "/tmp/mandosXXXXXX";
1922
char *tempdir = NULL;
1923
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1924
const char *seckey = PATHDIR "/" SECKEY;
1925
const char *pubkey = PATHDIR "/" PUBKEY;
1926
char *interfaces_hooks = NULL;
1928
bool gnutls_initialized = false;
1929
bool gpgme_initialized = false;
1931
double retry_interval = 10; /* 10s between trying a server and
1932
retrying the same server again */
1934
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1935
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1940
/* Lower any group privileges we might have, just to be safe */
1944
perror_plus("setgid");
1947
/* Lower user privileges (temporarily) */
1951
perror_plus("seteuid");
1959
struct argp_option options[] = {
1960
{ .name = "debug", .key = 128,
1961
.doc = "Debug mode", .group = 3 },
1962
{ .name = "connect", .key = 'c',
1963
.arg = "ADDRESS:PORT",
1964
.doc = "Connect directly to a specific Mandos server",
1966
{ .name = "interface", .key = 'i',
1968
.doc = "Network interface that will be used to search for"
1971
{ .name = "seckey", .key = 's',
1973
.doc = "OpenPGP secret key file base name",
1975
{ .name = "pubkey", .key = 'p',
1977
.doc = "OpenPGP public key file base name",
1979
{ .name = "dh-bits", .key = 129,
1981
.doc = "Bit length of the prime number used in the"
1982
" Diffie-Hellman key exchange",
1984
{ .name = "priority", .key = 130,
1986
.doc = "GnuTLS priority string for the TLS handshake",
1988
{ .name = "delay", .key = 131,
1990
.doc = "Maximum delay to wait for interface startup",
1992
{ .name = "retry", .key = 132,
1994
.doc = "Retry interval used when denied by the Mandos server",
1996
{ .name = "network-hook-dir", .key = 133,
1998
.doc = "Directory where network hooks are located",
2001
* These reproduce what we would get without ARGP_NO_HELP
2003
{ .name = "help", .key = '?',
2004
.doc = "Give this help list", .group = -1 },
2005
{ .name = "usage", .key = -3,
2006
.doc = "Give a short usage message", .group = -1 },
2007
{ .name = "version", .key = 'V',
2008
.doc = "Print program version", .group = -1 },
2012
error_t parse_opt(int key, char *arg,
2013
struct argp_state *state){
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);
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
887
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
893
gnutls_initalized = true;
896
/* If the interface is down, bring it up */
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
901
exitcode = EXIT_FAILURE;
904
strcpy(network.ifr_name, interface); /* Spurious warning */
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
936
if_index = (AvahiIfIndex) if_nametoindex(interface);
938
fprintf(stderr, "No such interface: \"%s\"\n", interface);
942
if(connect_to != NULL){
943
/* Connect directly, do not use Zeroconf */
944
/* (Mainly meant for debugging) */
945
char *address = strrchr(connect_to, ':');
947
fprintf(stderr, "No colon in address\n");
948
exitcode = EXIT_FAILURE;
2016
case 128: /* --debug */
2019
case 'c': /* --connect */
2022
case 'i': /* --interface */
2023
ret_errno = argz_add_sep(&mc.interfaces, &mc.interfaces_size,
2026
argp_error(state, "%s", strerror(ret_errno));
2029
case 's': /* --seckey */
2032
case 'p': /* --pubkey */
2035
case 129: /* --dh-bits */
2037
tmpmax = strtoimax(arg, &tmp, 10);
2038
if(errno != 0 or tmp == arg or *tmp != '\0'
2039
or tmpmax != (typeof(mc.dh_bits))tmpmax){
2040
argp_error(state, "Bad number of DH bits");
2042
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
2044
case 130: /* --priority */
2047
case 131: /* --delay */
2049
delay = strtof(arg, &tmp);
2050
if(errno != 0 or tmp == arg or *tmp != '\0'){
2051
argp_error(state, "Bad delay");
2053
case 132: /* --retry */
2055
retry_interval = strtod(arg, &tmp);
2056
if(errno != 0 or tmp == arg or *tmp != '\0'
2057
or (retry_interval * 1000) > INT_MAX
2058
or retry_interval < 0){
2059
argp_error(state, "Bad retry interval");
2062
case 133: /* --network-hook-dir */
2066
* These reproduce what we would get without ARGP_NO_HELP
2068
case '?': /* --help */
2069
argp_state_help(state, state->out_stream,
2070
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
2071
& ~(unsigned int)ARGP_HELP_EXIT_OK);
2072
case -3: /* --usage */
2073
argp_state_help(state, state->out_stream,
2074
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
2075
case 'V': /* --version */
2076
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
2077
exit(argp_err_exit_status);
2080
return ARGP_ERR_UNKNOWN;
2085
struct argp argp = { .options = options, .parser = parse_opt,
2087
.doc = "Mandos client -- Get and decrypt"
2088
" passwords from a Mandos server" };
2089
ret = argp_parse(&argp, argc, argv,
2090
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
2097
perror_plus("argp_parse");
2098
exitcode = EX_OSERR;
2101
exitcode = EX_USAGE;
2107
/* Work around Debian bug #633582:
2108
<http://bugs.debian.org/633582> */
2110
/* Re-raise privileges */
2111
ret_errno = raise_privileges();
2114
perror_plus("Failed to raise privileges");
2118
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
2119
int seckey_fd = open(seckey, O_RDONLY);
2120
if(seckey_fd == -1){
2121
perror_plus("open");
2123
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
2125
perror_plus("fstat");
2127
if(S_ISREG(st.st_mode)
2128
and st.st_uid == 0 and st.st_gid == 0){
2129
ret = fchown(seckey_fd, uid, gid);
2131
perror_plus("fchown");
2135
TEMP_FAILURE_RETRY(close(seckey_fd));
2139
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
2140
int pubkey_fd = open(pubkey, O_RDONLY);
2141
if(pubkey_fd == -1){
2142
perror_plus("open");
2144
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
2146
perror_plus("fstat");
2148
if(S_ISREG(st.st_mode)
2149
and st.st_uid == 0 and st.st_gid == 0){
2150
ret = fchown(pubkey_fd, uid, gid);
2152
perror_plus("fchown");
2156
TEMP_FAILURE_RETRY(close(pubkey_fd));
2160
/* Lower privileges */
2161
ret_errno = lower_privileges();
2164
perror_plus("Failed to lower privileges");
2169
/* Remove invalid interface names (except "none") */
2171
char *interface = NULL;
2172
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2174
if(strcmp(interface, "none") != 0
2175
and if_nametoindex(interface) == 0){
2176
if(interface[0] != '\0'){
2177
fprintf_plus(stderr, "Not using nonexisting interface"
2178
" \"%s\"\n", interface);
2180
argz_delete(&mc.interfaces, &mc.interfaces_size, interface);
2186
/* Run network hooks */
2188
if(mc.interfaces != NULL){
2189
interfaces_hooks = malloc(mc.interfaces_size);
2190
if(interfaces_hooks == NULL){
2191
perror_plus("malloc");
952
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
954
perror("Bad port number");
955
exitcode = EXIT_FAILURE;
2194
memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);
2195
argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');
2197
run_network_hooks("start", interfaces_hooks != NULL ?
2198
interfaces_hooks : "", delay);
2202
avahi_set_log_function(empty_log);
2205
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
2206
from the signal handler */
2207
/* Initialize the pseudo-RNG for Avahi */
2208
srand((unsigned int) time(NULL));
2209
simple_poll = avahi_simple_poll_new();
2210
if(simple_poll == NULL){
2211
fprintf_plus(stderr,
2212
"Avahi: Failed to create simple poll object.\n");
2213
exitcode = EX_UNAVAILABLE;
2217
sigemptyset(&sigterm_action.sa_mask);
2218
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
2220
perror_plus("sigaddset");
2221
exitcode = EX_OSERR;
2224
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
2226
perror_plus("sigaddset");
2227
exitcode = EX_OSERR;
2230
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
2232
perror_plus("sigaddset");
2233
exitcode = EX_OSERR;
2236
/* Need to check if the handler is SIG_IGN before handling:
2237
| [[info:libc:Initial Signal Actions]] |
2238
| [[info:libc:Basic Signal Handling]] |
2240
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
2242
perror_plus("sigaction");
2245
if(old_sigterm_action.sa_handler != SIG_IGN){
2246
ret = sigaction(SIGINT, &sigterm_action, NULL);
2248
perror_plus("sigaction");
2249
exitcode = EX_OSERR;
2253
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
2255
perror_plus("sigaction");
2258
if(old_sigterm_action.sa_handler != SIG_IGN){
2259
ret = sigaction(SIGHUP, &sigterm_action, NULL);
2261
perror_plus("sigaction");
2262
exitcode = EX_OSERR;
2266
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
2268
perror_plus("sigaction");
2271
if(old_sigterm_action.sa_handler != SIG_IGN){
2272
ret = sigaction(SIGTERM, &sigterm_action, NULL);
2274
perror_plus("sigaction");
2275
exitcode = EX_OSERR;
2280
/* If no interfaces were specified, make a list */
2281
if(mc.interfaces == NULL){
2282
struct dirent **direntries;
2283
/* Look for any good interfaces */
2284
ret = scandir(sys_class_net, &direntries, good_interface,
2287
/* Add all found interfaces to interfaces list */
2288
for(int i = 0; i < ret; ++i){
2289
ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,
2290
direntries[i]->d_name);
2293
perror_plus("argz_add");
2297
fprintf_plus(stderr, "Will use interface \"%s\"\n",
2298
direntries[i]->d_name);
2304
fprintf_plus(stderr, "Could not find a network interface\n");
2305
exitcode = EXIT_FAILURE;
2310
/* Bring up interfaces which are down, and remove any "none"s */
2312
char *interface = NULL;
2313
while((interface = argz_next(mc.interfaces, mc.interfaces_size,
2315
/* If interface name is "none", stop bringing up interfaces.
2316
Also remove all instances of "none" from the list */
2317
if(strcmp(interface, "none") == 0){
2318
argz_delete(&mc.interfaces, &mc.interfaces_size,
2321
while((interface = argz_next(mc.interfaces,
2322
mc.interfaces_size, interface))){
2323
if(strcmp(interface, "none") == 0){
2324
argz_delete(&mc.interfaces, &mc.interfaces_size,
2331
bool interface_was_up = interface_is_up(interface);
2332
errno = bring_up_interface(interface, delay);
2333
if(not interface_was_up){
2335
perror_plus("Failed to bring up interface");
2337
errno = argz_add(&interfaces_to_take_down,
2338
&interfaces_to_take_down_size,
2341
perror_plus("argz_add");
2346
if(debug and (interfaces_to_take_down == NULL)){
2347
fprintf_plus(stderr, "No interfaces were brought up\n");
2351
/* If we only got one interface, explicitly use only that one */
2352
if(argz_count(mc.interfaces, mc.interfaces_size) == 1){
2354
fprintf_plus(stderr, "Using only interface \"%s\"\n",
2357
if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);
2364
ret = init_gnutls_global(pubkey, seckey, &mc);
2366
fprintf_plus(stderr, "init_gnutls_global failed\n");
2367
exitcode = EX_UNAVAILABLE;
2370
gnutls_initialized = true;
2377
/* Try /run/tmp before /tmp */
2378
tempdir = mkdtemp(run_tempdir);
2379
if(tempdir == NULL and errno == ENOENT){
2381
fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",
2382
run_tempdir, old_tempdir);
2384
tempdir = mkdtemp(old_tempdir);
2386
if(tempdir == NULL){
2387
perror_plus("mkdtemp");
2395
if(not init_gpgme(pubkey, seckey, tempdir, &mc)){
2396
fprintf_plus(stderr, "init_gpgme failed\n");
2397
exitcode = EX_UNAVAILABLE;
2400
gpgme_initialized = true;
2407
if(connect_to != NULL){
2408
/* Connect directly, do not use Zeroconf */
2409
/* (Mainly meant for debugging) */
2410
char *address = strrchr(connect_to, ':');
2412
if(address == NULL){
2413
fprintf_plus(stderr, "No colon in address\n");
2414
exitcode = EX_USAGE;
2424
tmpmax = strtoimax(address+1, &tmp, 10);
2425
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2426
or tmpmax != (in_port_t)tmpmax){
2427
fprintf_plus(stderr, "Bad port number\n");
2428
exitcode = EX_USAGE;
2436
port = (in_port_t)tmpmax;
2438
/* Colon in address indicates IPv6 */
2440
if(strchr(connect_to, ':') != NULL){
2442
/* Accept [] around IPv6 address - see RFC 5952 */
2443
if(connect_to[0] == '[' and address[-1] == ']')
2451
address = connect_to;
2457
while(not quit_now){
2458
ret = start_mandos_communication(address, port, if_index, af,
2460
if(quit_now or ret == 0){
2464
fprintf_plus(stderr, "Retrying in %d seconds\n",
2465
(int)retry_interval);
2467
sleep((unsigned int)retry_interval);
2471
exitcode = EXIT_SUCCESS;
2482
AvahiServerConfig config;
2483
/* Do not publish any local Zeroconf records */
2484
avahi_server_config_init(&config);
2485
config.publish_hinfo = 0;
2486
config.publish_addresses = 0;
2487
config.publish_workstation = 0;
2488
config.publish_domain = 0;
2490
/* Allocate a new server */
2491
mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),
2492
&config, NULL, NULL, &ret_errno);
2494
/* Free the Avahi configuration data */
2495
avahi_server_config_free(&config);
2498
/* Check if creating the Avahi server object succeeded */
2499
if(mc.server == NULL){
2500
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2501
avahi_strerror(ret_errno));
2502
exitcode = EX_UNAVAILABLE;
2510
/* Create the Avahi service browser */
2511
sb = avahi_s_service_browser_new(mc.server, if_index,
2512
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2513
NULL, 0, browse_callback,
2516
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2517
avahi_strerror(avahi_server_errno(mc.server)));
2518
exitcode = EX_UNAVAILABLE;
2526
/* Run the main loop */
2529
fprintf_plus(stderr, "Starting Avahi loop search\n");
2532
ret = avahi_loop_with_timeout(simple_poll,
2533
(int)(retry_interval * 1000), &mc);
2535
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2536
(ret == 0) ? "successfully" : "with error");
959
address = connect_to;
960
ret = start_mandos_communication(address, port, if_index, &mc);
962
exitcode = EXIT_FAILURE;
964
exitcode = EXIT_SUCCESS;
970
avahi_set_log_function(empty_log);
973
/* Initialize the pseudo-RNG for Avahi */
974
srand((unsigned int) time(NULL));
976
/* Allocate main Avahi loop object */
977
mc.simple_poll = avahi_simple_poll_new();
978
if (mc.simple_poll == NULL) {
979
fprintf(stderr, "Avahi: Failed to create simple poll"
981
exitcode = EXIT_FAILURE;
986
AvahiServerConfig config;
987
/* Do not publish any local Zeroconf records */
988
avahi_server_config_init(&config);
989
config.publish_hinfo = 0;
990
config.publish_addresses = 0;
991
config.publish_workstation = 0;
992
config.publish_domain = 0;
994
/* Allocate a new server */
995
mc.server = avahi_server_new(avahi_simple_poll_get
996
(mc.simple_poll), &config, NULL,
999
/* Free the Avahi configuration data */
1000
avahi_server_config_free(&config);
1003
/* Check if creating the Avahi server object succeeded */
1004
if (mc.server == NULL) {
1005
fprintf(stderr, "Failed to create Avahi server: %s\n",
1006
avahi_strerror(error));
1007
exitcode = EXIT_FAILURE;
1011
/* Create the Avahi service browser */
1012
sb = avahi_s_service_browser_new(mc.server, if_index,
1014
"_mandos._tcp", NULL, 0,
1015
browse_callback, &mc);
1017
fprintf(stderr, "Failed to create service browser: %s\n",
1018
avahi_strerror(avahi_server_errno(mc.server)));
1019
exitcode = EXIT_FAILURE;
1023
/* Run the main loop */
1026
fprintf(stderr, "Starting Avahi loop search\n");
1029
avahi_simple_poll_loop(mc.simple_poll);
2542
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2545
/* Cleanup things */
2546
free(mc.interfaces);
2549
avahi_s_service_browser_free(sb);
2551
if(mc.server != NULL)
2552
avahi_server_free(mc.server);
2554
if(simple_poll != NULL)
2555
avahi_simple_poll_free(simple_poll);
2557
if(gnutls_initialized){
2558
gnutls_certificate_free_credentials(mc.cred);
2559
gnutls_global_deinit();
2560
gnutls_dh_params_deinit(mc.dh_params);
2563
if(gpgme_initialized){
2564
gpgme_release(mc.ctx);
2567
/* Cleans up the circular linked list of Mandos servers the client
2569
if(mc.current_server != NULL){
2570
mc.current_server->prev->next = NULL;
2571
while(mc.current_server != NULL){
2572
server *next = mc.current_server->next;
2573
free(mc.current_server);
2574
mc.current_server = next;
2578
/* Re-raise privileges */
2580
ret_errno = raise_privileges();
2582
perror_plus("Failed to raise privileges");
2585
/* Run network hooks */
2586
run_network_hooks("stop", interfaces_hooks != NULL ?
2587
interfaces_hooks : "", delay);
2589
/* Take down the network interfaces which were brought up */
2591
char *interface = NULL;
2592
while((interface=argz_next(interfaces_to_take_down,
2593
interfaces_to_take_down_size,
2595
ret_errno = take_down_interface(interface);
2598
perror_plus("Failed to take down interface");
2601
if(debug and (interfaces_to_take_down == NULL)){
2602
fprintf_plus(stderr, "No interfaces needed to be taken"
2608
ret_errno = lower_privileges_permanently();
2610
perror_plus("Failed to lower privileges permanently");
2614
free(interfaces_to_take_down);
2615
free(interfaces_hooks);
2617
/* Removes the GPGME temp directory and all files inside */
2618
if(tempdir != NULL){
2619
struct dirent **direntries = NULL;
2620
struct dirent *direntry = NULL;
2621
int numentries = scandir(tempdir, &direntries, notdotentries,
2624
for(int i = 0; i < numentries; i++){
2625
direntry = direntries[i];
2626
char *fullname = NULL;
2627
ret = asprintf(&fullname, "%s/%s", tempdir,
2630
perror_plus("asprintf");
2633
ret = remove(fullname);
2635
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2642
/* need to clean even if 0 because man page doesn't specify */
2644
if(numentries == -1){
2645
perror_plus("scandir");
2647
ret = rmdir(tempdir);
2648
if(ret == -1 and errno != ENOENT){
2649
perror_plus("rmdir");
2654
sigemptyset(&old_sigterm_action.sa_mask);
2655
old_sigterm_action.sa_handler = SIG_DFL;
2656
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2657
&old_sigterm_action,
2660
perror_plus("sigaction");
2663
ret = raise(signal_received);
2664
} while(ret != 0 and errno == EINTR);
2666
perror_plus("raise");
2669
TEMP_FAILURE_RETRY(pause());
1034
fprintf(stderr, "%s exiting\n", argv[0]);
1037
/* Cleanup things */
1039
avahi_s_service_browser_free(sb);
1041
if (mc.server != NULL)
1042
avahi_server_free(mc.server);
1044
if (mc.simple_poll != NULL)
1045
avahi_simple_poll_free(mc.simple_poll);
1049
if (gnutls_initalized){
1050
gnutls_certificate_free_credentials(mc.cred);
1051
gnutls_global_deinit ();