26
25
* along with this program. If not, see
27
26
* <http://www.gnu.org/licenses/>.
29
* Contact the authors at <mandos@recompile.se>.
28
* Contact the authors at <mandos@fukt.bsnet.se>.
32
31
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
34
32
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
37
33
#define _FILE_OFFSET_BITS 64
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout, ferror() */
44
38
#include <stdint.h> /* uint16_t, uint32_t */
45
39
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
40
#include <stdlib.h> /* free() */
41
#include <stdbool.h> /* bool, true */
42
#include <string.h> /* memset(), strcmp(), strlen, strerror() */
43
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
52
45
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
53
sockaddr_in6, PF_INET6,
54
SOCK_STREAM, uid_t, gid_t, open(),
56
#include <sys/stat.h> /* open(), S_ISREG */
46
sockaddr_in6, PF_INET6, SOCK_STREAM, INET6_ADDRSTRLEN */
57
47
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
58
inet_pton(), connect() */
59
#include <fcntl.h> /* open() */
60
#include <dirent.h> /* opendir(), struct dirent, readdir()
62
#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,
64
#include <assert.h> /* assert() */
65
#include <errno.h> /* perror(), errno,
66
program_invocation_short_name */
67
#include <time.h> /* nanosleep(), time(), sleep() */
48
struct in6_addr, inet_pton(),
51
#include <errno.h> /* perror() */
68
53
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
69
54
SIOCSIFFLAGS, if_indextoname(),
70
55
if_nametoindex(), IF_NAMESIZE */
71
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
72
INET_ADDRSTRLEN, INET6_ADDRSTRLEN
74
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
75
getuid(), getgid(), seteuid(),
76
setgid(), pause(), _exit() */
77
#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */
78
#include <iso646.h> /* not, or, and */
79
#include <argp.h> /* struct argp_option, error_t, struct
80
argp_state, struct argp,
81
argp_parse(), ARGP_KEY_ARG,
82
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
83
#include <signal.h> /* sigemptyset(), sigaddset(),
84
sigaction(), SIGTERM, sig_atomic_t,
86
#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
87
EX_NOHOST, EX_IOERR, EX_PROTOCOL */
88
#include <sys/wait.h> /* waitpid(), WIFEXITED(),
89
WEXITSTATUS(), WTERMSIG() */
92
#include <sys/klog.h> /* klogctl() */
93
#endif /* __linux__ */
56
#include <unistd.h> /* close(), SEEK_SET, off_t, write()*/
57
#include <netinet/in.h>
58
#include <arpa/inet.h> /* inet_pton(), htons */
59
#include <iso646.h> /* not */
60
#include <argp.h> /* struct argp_option,
61
struct argp_state, struct argp,
96
/* All Avahi types, constants and functions
99
#include <avahi-core/core.h>
65
#include <avahi-core/core.h> /* AvahiSimplePoll, AvahiServer,
100
67
#include <avahi-core/lookup.h>
101
#include <avahi-core/log.h>
68
#include <avahi-core/log.h> /* AvahiLogLevel */
102
69
#include <avahi-common/simple-watch.h>
103
70
#include <avahi-common/malloc.h>
104
71
#include <avahi-common/error.h>
107
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
74
#include <gnutls/gnutls.h> /* gnutls_certificate_credentials_t,
78
gnutls_global_set_log_level(),
79
gnutls_global_set_log_function(),
80
gnutls_certificate_allocate_credentials(),
81
gnutls_global_deinit(),
82
gnutls_dh_params_init(),
83
gnutls_dh_params_generate(),
84
gnutls_certificate_set_dh_params(),
85
gnutls_certificate_free_credentials(),
86
gnutls_session_t, gnutls_init(),
87
gnutls_priority_set_direct(),
89
gnutls_credentials_set(),
90
gnutls_certificate_server_set_request(),
91
gnutls_dh_set_prime_bits(),
92
gnutls_transport_set_ptr(),
93
gnutls_transport_ptr_t,
96
gnutls_perror(), gnutls_bye(),
110
97
init_gnutls_session(),
112
#include <gnutls/openpgp.h>
113
/* gnutls_certificate_set_openpgp_key_file(),
114
GNUTLS_OPENPGP_FMT_BASE64 */
99
GNUTLS_CRD_CERTIFICATE,
101
GNUTLS_E_INTERRUPTED,
103
GNUTLS_E_REHANDSHAKE,
105
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
106
GNUTLS_OPENPGP_FMT_BASE64 */
117
#include <gpgme.h> /* All GPGME types, constants and
109
#include <gpgme.h> /* gpgme_data_t, gpgme_ctx_t,
110
gpgme_error_t, gpgme_engine_info_t,
111
gpgme_check_version(),
112
gpgme_engine_check_version(),
115
gpgme_get_engine_info(),
116
gpgme_set_engine_info(),
117
gpgme_data_new_from_mem(),
118
gpgme_data_new(), gpgme_new(),
120
gpgme_decrypt_result_t,
121
gpgme_op_decrypt_result(),
123
gpgme_pubkey_algo_name(),
120
127
GPGME_PROTOCOL_OpenPGP,
129
GPG_ERR_NO_SECKEY, */
123
131
#define BUFFER_SIZE 256
125
#define PATHDIR "/conf/conf.d/mandos"
126
#define SECKEY "seckey.txt"
127
#define PUBKEY "pubkey.txt"
128
#define HOOKDIR "/lib/mandos/network-hooks.d"
130
133
bool debug = false;
134
static const char *keydir = "/conf/conf.d/mandos";
131
135
static const char mandos_protocol_version[] = "1";
132
const char *argp_program_version = "mandos-client " VERSION;
133
const char *argp_program_bug_address = "<mandos@recompile.se>";
134
static const char sys_class_net[] = "/sys/class/net";
135
char *connect_to = NULL;
136
const char *hookdir = HOOKDIR;
138
/* Doubly linked list that need to be circularly linked when used */
139
typedef struct server{
142
AvahiIfIndex if_index;
144
struct timespec last_seen;
136
const char *argp_program_version = "mandosclient 0.9";
137
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
149
139
/* Used for passing in values through the Avahi callback functions */
200
163
return buffer_capacity;
203
/* Add server to set of servers to retry periodically */
204
int add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,
207
server *new_server = malloc(sizeof(server));
208
if(new_server == NULL){
209
perror_plus("malloc");
212
*new_server = (server){ .ip = strdup(ip),
214
.if_index = if_index,
216
if(new_server->ip == NULL){
217
perror_plus("strdup");
220
/* Special case of first server */
221
if (mc.current_server == NULL){
222
new_server->next = new_server;
223
new_server->prev = new_server;
224
mc.current_server = new_server;
225
/* Place the new server last in the list */
227
new_server->next = mc.current_server;
228
new_server->prev = mc.current_server->prev;
229
new_server->prev->next = new_server;
230
mc.current_server->prev = new_server;
232
ret = clock_gettime(CLOCK_MONOTONIC, &mc.current_server->last_seen);
234
perror_plus("clock_gettime");
167
* Decrypt OpenPGP data using keyrings in HOMEDIR.
168
* Returns -1 on error
243
static bool init_gpgme(const char *seckey, const char *pubkey,
244
const char *tempdir){
170
static ssize_t pgp_packet_decrypt (const char *cryptotext,
173
const char *homedir){
174
gpgme_data_t dh_crypto, dh_plain;
245
176
gpgme_error_t rc;
178
size_t plaintext_capacity = 0;
179
ssize_t plaintext_length = 0;
246
180
gpgme_engine_info_t engine_info;
250
* Helper function to insert pub and seckey to the engine keyring.
252
bool import_key(const char *filename){
255
gpgme_data_t pgp_data;
257
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
263
rc = gpgme_data_new_from_fd(&pgp_data, fd);
264
if(rc != GPG_ERR_NO_ERROR){
265
fprintf_plus(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
266
gpgme_strsource(rc), gpgme_strerror(rc));
270
rc = gpgme_op_import(mc.ctx, pgp_data);
271
if(rc != GPG_ERR_NO_ERROR){
272
fprintf_plus(stderr, "bad gpgme_op_import: %s: %s\n",
273
gpgme_strsource(rc), gpgme_strerror(rc));
277
ret = (int)TEMP_FAILURE_RETRY(close(fd));
279
perror_plus("close");
281
gpgme_data_release(pgp_data);
286
fprintf_plus(stderr, "Initializing GPGME\n");
183
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
290
187
gpgme_check_version(NULL);
291
188
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
292
if(rc != GPG_ERR_NO_ERROR){
293
fprintf_plus(stderr, "bad gpgme_engine_check_version: %s: %s\n",
294
gpgme_strsource(rc), gpgme_strerror(rc));
189
if (rc != GPG_ERR_NO_ERROR){
190
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
191
gpgme_strsource(rc), gpgme_strerror(rc));
298
195
/* Set GPGME home directory for the OpenPGP engine only */
299
rc = gpgme_get_engine_info(&engine_info);
300
if(rc != GPG_ERR_NO_ERROR){
301
fprintf_plus(stderr, "bad gpgme_get_engine_info: %s: %s\n",
302
gpgme_strsource(rc), gpgme_strerror(rc));
196
rc = gpgme_get_engine_info (&engine_info);
197
if (rc != GPG_ERR_NO_ERROR){
198
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
199
gpgme_strsource(rc), gpgme_strerror(rc));
305
202
while(engine_info != NULL){
306
203
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
307
204
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
308
engine_info->file_name, tempdir);
205
engine_info->file_name, homedir);
311
208
engine_info = engine_info->next;
313
210
if(engine_info == NULL){
314
fprintf_plus(stderr, "Could not set GPGME home dir to %s\n",
319
/* Create new GPGME "context" */
320
rc = gpgme_new(&(mc.ctx));
321
if(rc != GPG_ERR_NO_ERROR){
322
fprintf_plus(stderr, "Mandos plugin mandos-client: "
323
"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),
328
if(not import_key(pubkey) or not import_key(seckey)){
336
* Decrypt OpenPGP data.
337
* Returns -1 on error
339
static ssize_t pgp_packet_decrypt(const char *cryptotext,
342
gpgme_data_t dh_crypto, dh_plain;
345
size_t plaintext_capacity = 0;
346
ssize_t plaintext_length = 0;
349
fprintf_plus(stderr, "Trying to decrypt OpenPGP data\n");
211
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
352
215
/* Create new GPGME data buffer from memory cryptotext */
353
216
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
355
if(rc != GPG_ERR_NO_ERROR){
356
fprintf_plus(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
357
gpgme_strsource(rc), gpgme_strerror(rc));
218
if (rc != GPG_ERR_NO_ERROR){
219
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
220
gpgme_strsource(rc), gpgme_strerror(rc));
361
224
/* Create new empty GPGME data buffer for the plaintext */
362
225
rc = gpgme_data_new(&dh_plain);
363
if(rc != GPG_ERR_NO_ERROR){
364
fprintf_plus(stderr, "Mandos plugin mandos-client: "
365
"bad gpgme_data_new: %s: %s\n",
366
gpgme_strsource(rc), gpgme_strerror(rc));
226
if (rc != GPG_ERR_NO_ERROR){
227
fprintf(stderr, "bad gpgme_data_new: %s: %s\n",
228
gpgme_strsource(rc), gpgme_strerror(rc));
367
229
gpgme_data_release(dh_crypto);
233
/* Create new GPGME "context" */
234
rc = gpgme_new(&ctx);
235
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "bad gpgme_new: %s: %s\n",
237
gpgme_strsource(rc), gpgme_strerror(rc));
238
plaintext_length = -1;
371
242
/* Decrypt data from the cryptotext data buffer to the plaintext
373
rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);
374
if(rc != GPG_ERR_NO_ERROR){
375
fprintf_plus(stderr, "bad gpgme_op_decrypt: %s: %s\n",
376
gpgme_strsource(rc), gpgme_strerror(rc));
244
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
245
if (rc != GPG_ERR_NO_ERROR){
246
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
247
gpgme_strsource(rc), gpgme_strerror(rc));
377
248
plaintext_length = -1;
379
gpgme_decrypt_result_t result;
380
result = gpgme_op_decrypt_result(mc.ctx);
382
fprintf_plus(stderr, "gpgme_op_decrypt_result failed\n");
384
fprintf_plus(stderr, "Unsupported algorithm: %s\n",
385
result->unsupported_algorithm);
386
fprintf_plus(stderr, "Wrong key usage: %u\n",
387
result->wrong_key_usage);
388
if(result->file_name != NULL){
389
fprintf_plus(stderr, "File name: %s\n", result->file_name);
391
gpgme_recipient_t recipient;
392
recipient = result->recipients;
253
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
257
gpgme_decrypt_result_t result;
258
result = gpgme_op_decrypt_result(ctx);
260
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
262
fprintf(stderr, "Unsupported algorithm: %s\n",
263
result->unsupported_algorithm);
264
fprintf(stderr, "Wrong key usage: %d\n",
265
result->wrong_key_usage);
266
if(result->file_name != NULL){
267
fprintf(stderr, "File name: %s\n", result->file_name);
269
gpgme_recipient_t recipient;
270
recipient = result->recipients;
393
272
while(recipient != NULL){
394
fprintf_plus(stderr, "Public key algorithm: %s\n",
395
gpgme_pubkey_algo_name
396
(recipient->pubkey_algo));
397
fprintf_plus(stderr, "Key ID: %s\n", recipient->keyid);
398
fprintf_plus(stderr, "Secret key available: %s\n",
399
recipient->status == GPG_ERR_NO_SECKEY
273
fprintf(stderr, "Public key algorithm: %s\n",
274
gpgme_pubkey_algo_name(recipient->pubkey_algo));
275
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
276
fprintf(stderr, "Secret key available: %s\n",
277
recipient->status == GPG_ERR_NO_SECKEY
401
279
recipient = recipient->next;
409
fprintf_plus(stderr, "Decryption of OpenPGP data succeeded\n");
412
285
/* Seek back to the beginning of the GPGME plaintext data buffer */
413
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
414
perror_plus("gpgme_data_seek");
286
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
287
perror("pgpme_data_seek");
415
288
plaintext_length = -1;
416
289
goto decrypt_end;
419
292
*plaintext = NULL;
421
plaintext_capacity = incbuffer(plaintext,
422
(size_t)plaintext_length,
424
if(plaintext_capacity == 0){
425
perror_plus("incbuffer");
426
plaintext_length = -1;
294
plaintext_capacity = adjustbuffer(plaintext,
295
(size_t)plaintext_length,
297
if (plaintext_capacity == 0){
298
perror("adjustbuffer");
299
plaintext_length = -1;
430
303
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
432
305
/* Print the data, if any */
438
perror_plus("gpgme_data_read");
311
perror("gpgme_data_read");
439
312
plaintext_length = -1;
440
313
goto decrypt_end;
442
315
plaintext_length += ret;
446
fprintf_plus(stderr, "Decrypted password is: ");
319
fprintf(stderr, "Decrypted password is: ");
447
320
for(ssize_t i = 0; i < plaintext_length; i++){
448
321
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
615
469
/* Called when a Mandos server is found */
616
470
static int start_mandos_communication(const char *ip, uint16_t port,
617
471
AvahiIfIndex if_index,
619
int ret, tcp_sd = -1;
622
struct sockaddr_in in;
623
struct sockaddr_in6 in6;
474
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
625
475
char *buffer = NULL;
626
char *decrypted_buffer = NULL;
476
char *decrypted_buffer;
627
477
size_t buffer_length = 0;
628
478
size_t buffer_capacity = 0;
479
ssize_t decrypted_buffer_size;
482
char interface[IF_NAMESIZE];
631
483
gnutls_session_t session;
632
int pf; /* Protocol family */
649
fprintf_plus(stderr, "Bad address family: %d\n", af);
654
ret = init_gnutls_session(&session);
660
fprintf_plus(stderr, "Setting up a TCP connection to %s, port %"
661
PRIu16 "\n", ip, port);
664
tcp_sd = socket(pf, SOCK_STREAM, 0);
667
perror_plus("socket");
677
memset(&to, 0, sizeof(to));
679
to.in6.sin6_family = (sa_family_t)af;
680
ret = inet_pton(af, ip, &to.in6.sin6_addr);
682
to.in.sin_family = (sa_family_t)af;
683
ret = inet_pton(af, ip, &to.in.sin_addr);
687
perror_plus("inet_pton");
485
ret = init_gnutls_session (mc, &session);
491
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
495
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
502
if(if_indextoname((unsigned int)if_index, interface) == NULL){
503
perror("if_indextoname");
506
fprintf(stderr, "Binding to interface %s\n", interface);
509
memset(&to,0,sizeof(to)); /* Spurious warning */
510
to.in6.sin6_family = AF_INET6;
511
/* It would be nice to have a way to detect if we were passed an
512
IPv4 address here. Now we assume an IPv6 address. */
513
ret = inet_pton(AF_INET6, ip, &to.in6.sin6_addr);
693
fprintf_plus(stderr, "Bad address: %s\n", ip);
698
to.in6.sin6_port = htons(port); /* Spurious warnings from
700
-Wunreachable-code */
702
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
703
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
705
if(if_index == AVAHI_IF_UNSPEC){
706
fprintf_plus(stderr, "An IPv6 link-local address is"
707
" incomplete without a network interface\n");
711
/* Set the network interface number as scope */
712
to.in6.sin6_scope_id = (uint32_t)if_index;
715
to.in.sin_port = htons(port); /* Spurious warnings from
717
-Wunreachable-code */
519
fprintf(stderr, "Bad address: %s\n", ip);
522
to.in6.sin6_port = htons(port); /* Spurious warning */
524
to.in6.sin6_scope_id = (uint32_t)if_index;
726
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
727
char interface[IF_NAMESIZE];
728
if(if_indextoname((unsigned int)if_index, interface) == NULL){
729
perror_plus("if_indextoname");
731
fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16
732
"\n", ip, interface, port);
735
fprintf_plus(stderr, "Connection to: %s, port %" PRIu16 "\n",
738
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
739
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
742
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
745
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
749
perror_plus("inet_ntop");
527
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
528
char addrstr[INET6_ADDRSTRLEN] = "";
529
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
530
sizeof(addrstr)) == NULL){
751
533
if(strcmp(addrstr, ip) != 0){
752
fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);
534
fprintf(stderr, "Canonical address form: %s\n", addrstr);
763
ret = connect(tcp_sd, &to.in6, sizeof(to));
765
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
768
if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){
770
perror_plus("connect");
539
ret = connect(tcp_sd, &to.in, sizeof(to));
781
545
const char *out = mandos_protocol_version;
784
548
size_t out_size = strlen(out);
785
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
786
out_size - written));
789
perror_plus("write");
549
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
550
out_size - written));
793
556
written += (size_t)ret;
794
557
if(written < out_size){
797
if(out == mandos_protocol_version){
560
if (out == mandos_protocol_version){
812
fprintf_plus(stderr, "Establishing TLS session with %s\n", ip);
820
/* Spurious warning from -Wint-to-pointer-cast */
821
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
829
ret = gnutls_handshake(session);
834
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
836
if(ret != GNUTLS_E_SUCCESS){
570
fprintf(stderr, "Establishing TLS session with %s\n", ip);
573
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
575
ret = gnutls_handshake (session);
577
if (ret != GNUTLS_E_SUCCESS){
838
fprintf_plus(stderr, "*** GnuTLS Handshake failed ***\n");
579
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
845
586
/* Read OpenPGP packet that contains the wanted password */
848
fprintf_plus(stderr, "Retrieving OpenPGP encrypted password from"
589
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
859
buffer_capacity = incbuffer(&buffer, buffer_length,
861
if(buffer_capacity == 0){
863
perror_plus("incbuffer");
873
sret = gnutls_record_recv(session, buffer+buffer_length,
594
buffer_capacity = adjustbuffer(&buffer, buffer_length,
596
if (buffer_capacity == 0){
597
perror("adjustbuffer");
602
ret = gnutls_record_recv(session, buffer+buffer_length,
880
609
case GNUTLS_E_INTERRUPTED:
881
610
case GNUTLS_E_AGAIN:
883
612
case GNUTLS_E_REHANDSHAKE:
885
ret = gnutls_handshake(session);
891
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
893
fprintf_plus(stderr, "*** GnuTLS Re-handshake failed "
613
ret = gnutls_handshake (session);
615
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
901
fprintf_plus(stderr, "Unknown error while reading data from"
902
" encrypted session with Mandos server\n");
903
gnutls_bye(session, GNUTLS_SHUT_RDWR);
622
fprintf(stderr, "Unknown error while reading data from"
623
" encrypted session with Mandos server\n");
625
gnutls_bye (session, GNUTLS_SHUT_RDWR);
908
buffer_length += (size_t) sret;
629
buffer_length += (size_t) ret;
913
fprintf_plus(stderr, "Closing TLS session\n");
922
ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);
927
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
929
if(buffer_length > 0){
930
ssize_t decrypted_buffer_size;
931
decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,
933
if(decrypted_buffer_size >= 0){
634
fprintf(stderr, "Closing TLS session\n");
637
gnutls_bye (session, GNUTLS_SHUT_RDWR);
639
if (buffer_length > 0){
640
decrypted_buffer_size = pgp_packet_decrypt(buffer,
644
if (decrypted_buffer_size >= 0){
936
646
while(written < (size_t) decrypted_buffer_size){
942
ret = (int)fwrite(decrypted_buffer + written, 1,
943
(size_t)decrypted_buffer_size - written,
647
ret = (int)fwrite (decrypted_buffer + written, 1,
648
(size_t)decrypted_buffer_size - written,
945
650
if(ret == 0 and ferror(stdout)){
948
fprintf_plus(stderr, "Error writing encrypted data: %s\n",
652
fprintf(stderr, "Error writing encrypted data: %s\n",
954
658
written += (size_t)ret;
660
free(decrypted_buffer);
960
666
/* Shutdown procedure */
965
free(decrypted_buffer);
968
ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));
974
perror_plus("close");
976
gnutls_deinit(session);
671
gnutls_deinit (session);
986
675
static void resolve_callback(AvahiSServiceResolver *r,
987
676
AvahiIfIndex interface,
677
AVAHI_GCC_UNUSED AvahiProtocol protocol,
989
678
AvahiResolverEvent event,
990
679
const char *name,
991
680
const char *type,
1085
762
case AVAHI_BROWSER_ALL_FOR_NOW:
1086
763
case AVAHI_BROWSER_CACHE_EXHAUSTED:
1088
fprintf_plus(stderr, "No Mandos server found, still"
765
fprintf(stderr, "No Mandos server found, still searching...\n");
1095
/* Signal handler that stops main loop after SIGTERM */
1096
static void handle_sigterm(int sig){
1101
signal_received = sig;
1102
int old_errno = errno;
1103
/* set main loop to exit */
1104
if(mc.simple_poll != NULL){
1105
avahi_simple_poll_quit(mc.simple_poll);
1110
bool get_flags(const char *ifname, struct ifreq *ifr){
1113
int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1115
perror_plus("socket");
1118
strcpy(ifr->ifr_name, ifname);
1119
ret = ioctl(s, SIOCGIFFLAGS, ifr);
1122
perror_plus("ioctl SIOCGIFFLAGS");
1129
bool good_flags(const char *ifname, const struct ifreq *ifr){
1131
/* Reject the loopback device */
1132
if(ifr->ifr_flags & IFF_LOOPBACK){
1134
fprintf_plus(stderr, "Rejecting loopback interface \"%s\"\n",
1139
/* Accept point-to-point devices only if connect_to is specified */
1140
if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){
1142
fprintf_plus(stderr, "Accepting point-to-point interface"
1143
" \"%s\"\n", ifname);
1147
/* Otherwise, reject non-broadcast-capable devices */
1148
if(not (ifr->ifr_flags & IFF_BROADCAST)){
1150
fprintf_plus(stderr, "Rejecting non-broadcast interface"
1151
" \"%s\"\n", ifname);
1155
/* Reject non-ARP interfaces (including dummy interfaces) */
1156
if(ifr->ifr_flags & IFF_NOARP){
1158
fprintf_plus(stderr, "Rejecting non-ARP interface \"%s\"\n",
1164
/* Accept this device */
1166
fprintf_plus(stderr, "Interface \"%s\" is good\n", ifname);
1172
* This function determines if a directory entry in /sys/class/net
1173
* corresponds to an acceptable network device.
1174
* (This function is passed to scandir(3) as a filter function.)
1176
int good_interface(const struct dirent *if_entry){
1177
if(if_entry->d_name[0] == '.'){
1182
if(not get_flags(if_entry->d_name, &ifr)){
1184
fprintf_plus(stderr, "Failed to get flags for interface "
1185
"\"%s\"\n", if_entry->d_name);
1190
if(not good_flags(if_entry->d_name, &ifr)){
1197
* This function determines if a directory entry in /sys/class/net
1198
* corresponds to an acceptable network device which is up.
1199
* (This function is passed to scandir(3) as a filter function.)
1201
int up_interface(const struct dirent *if_entry){
1202
if(if_entry->d_name[0] == '.'){
1207
if(not get_flags(if_entry->d_name, &ifr)){
1209
fprintf_plus(stderr, "Failed to get flags for interface "
1210
"\"%s\"\n", if_entry->d_name);
1215
/* Reject down interfaces */
1216
if(not (ifr.ifr_flags & IFF_UP)){
1218
fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",
1224
/* Reject non-running interfaces */
1225
if(not (ifr.ifr_flags & IFF_RUNNING)){
1227
fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",
1233
if(not good_flags(if_entry->d_name, &ifr)){
1239
int notdotentries(const struct dirent *direntry){
1240
/* Skip "." and ".." */
1241
if(direntry->d_name[0] == '.'
1242
and (direntry->d_name[1] == '\0'
1243
or (direntry->d_name[1] == '.'
1244
and direntry->d_name[2] == '\0'))){
1250
/* Is this directory entry a runnable program? */
1251
int runnable_hook(const struct dirent *direntry){
1256
if((direntry->d_name)[0] == '\0'){
1261
sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
1262
"abcdefghijklmnopqrstuvwxyz"
1265
if((direntry->d_name)[sret] != '\0'){
1266
/* Contains non-allowed characters */
1268
fprintf_plus(stderr, "Ignoring hook \"%s\" with bad name\n",
1274
char *fullname = NULL;
1275
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1277
perror_plus("asprintf");
1281
ret = stat(fullname, &st);
1284
perror_plus("Could not stat hook");
1288
if(not (S_ISREG(st.st_mode))){
1289
/* Not a regular file */
1291
fprintf_plus(stderr, "Ignoring hook \"%s\" - not a file\n",
1296
if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){
1297
/* Not executable */
1299
fprintf_plus(stderr, "Ignoring hook \"%s\" - not executable\n",
1305
fprintf_plus(stderr, "Hook \"%s\" is acceptable\n",
1311
int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){
1313
struct timespec now;
1314
struct timespec waited_time;
1315
intmax_t block_time;
1318
if(mc.current_server == NULL){
1320
fprintf_plus(stderr, "Wait until first server is found."
1323
ret = avahi_simple_poll_iterate(s, -1);
1326
fprintf_plus(stderr, "Check current_server if we should run"
1329
/* the current time */
1330
ret = clock_gettime(CLOCK_MONOTONIC, &now);
1332
perror_plus("clock_gettime");
1335
/* Calculating in ms how long time between now and server
1336
who we visted longest time ago. Now - last seen. */
1337
waited_time.tv_sec = (now.tv_sec
1338
- mc.current_server->last_seen.tv_sec);
1339
waited_time.tv_nsec = (now.tv_nsec
1340
- mc.current_server->last_seen.tv_nsec);
1341
/* total time is 10s/10,000ms.
1342
Converting to s from ms by dividing by 1,000,
1343
and ns to ms by dividing by 1,000,000. */
1344
block_time = ((retry_interval
1345
- ((intmax_t)waited_time.tv_sec * 1000))
1346
- ((intmax_t)waited_time.tv_nsec / 1000000));
1349
fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",
1353
if(block_time <= 0){
1354
ret = start_mandos_communication(mc.current_server->ip,
1355
mc.current_server->port,
1356
mc.current_server->if_index,
1357
mc.current_server->af);
1359
avahi_simple_poll_quit(mc.simple_poll);
1362
ret = clock_gettime(CLOCK_MONOTONIC,
1363
&mc.current_server->last_seen);
1365
perror_plus("clock_gettime");
1368
mc.current_server = mc.current_server->next;
1369
block_time = 0; /* Call avahi to find new Mandos
1370
servers, but don't block */
1373
ret = avahi_simple_poll_iterate(s, (int)block_time);
1376
if (ret > 0 or errno != EINTR){
1377
return (ret != 1) ? ret : 0;
1383
bool run_network_hooks(const char *mode, const char *interface,
1385
struct dirent **direntries;
1386
struct dirent *direntry;
1388
int numhooks = scandir(hookdir, &direntries, runnable_hook,
1391
perror_plus("scandir");
1393
int devnull = open("/dev/null", O_RDONLY);
1394
for(int i = 0; i < numhooks; i++){
1395
direntry = direntries[i];
1396
char *fullname = NULL;
1397
ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);
1399
perror_plus("asprintf");
1403
fprintf_plus(stderr, "Running network hook \"%s\"\n",
1406
pid_t hook_pid = fork();
1409
dup2(devnull, STDIN_FILENO);
1411
dup2(STDERR_FILENO, STDOUT_FILENO);
1412
ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);
1414
perror_plus("setenv");
1417
ret = setenv("DEVICE", interface, 1);
1419
perror_plus("setenv");
1422
ret = setenv("VERBOSE", debug ? "1" : "0", 1);
1424
perror_plus("setenv");
1427
ret = setenv("MODE", mode, 1);
1429
perror_plus("setenv");
1433
ret = asprintf(&delaystring, "%f", delay);
1435
perror_plus("asprintf");
1438
ret = setenv("DELAY", delaystring, 1);
1441
perror_plus("setenv");
1445
ret = execl(fullname, direntry->d_name, mode, NULL);
1446
perror_plus("execl");
1449
if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){
1450
perror_plus("waitpid");
1454
if(WIFEXITED(status)){
1455
if(WEXITSTATUS(status) != 0){
1456
fprintf_plus(stderr, "Warning: network hook \"%s\" exited"
1457
" with status %d\n", direntry->d_name,
1458
WEXITSTATUS(status));
1462
} else if(WIFSIGNALED(status)){
1463
fprintf_plus(stderr, "Warning: network hook \"%s\" died by"
1464
" signal %d\n", direntry->d_name,
1469
fprintf_plus(stderr, "Warning: network hook \"%s\""
1470
" crashed\n", direntry->d_name);
1477
fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",
771
/* Combines file name and path and returns the malloced new
772
string. some sane checks could/should be added */
773
static const char *combinepath(const char *first, const char *second){
774
size_t f_len = strlen(first);
775
size_t s_len = strlen(second);
776
char *tmp = malloc(f_len + s_len + 2);
781
memcpy(tmp, first, f_len); /* Spurious warning */
785
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
787
tmp[f_len + 1 + s_len] = '\0';
1486
792
int main(int argc, char *argv[]){
1487
AvahiSServiceBrowser *sb = NULL;
1492
int exitcode = EXIT_SUCCESS;
1493
const char *interface = "";
1494
struct ifreq network;
1496
bool take_down_interface = false;
1499
char tempdir[] = "/tmp/mandosXXXXXX";
1500
bool tempdir_created = false;
1501
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
1502
const char *seckey = PATHDIR "/" SECKEY;
1503
const char *pubkey = PATHDIR "/" PUBKEY;
1505
bool gnutls_initialized = false;
1506
bool gpgme_initialized = false;
1508
double retry_interval = 10; /* 10s between trying a server and
1509
retrying the same server again */
1511
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1512
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1517
/* Lower any group privileges we might have, just to be safe */
1521
perror_plus("setgid");
1524
/* Lower user privileges (temporarily) */
1528
perror_plus("seteuid");
1536
struct argp_option options[] = {
1537
{ .name = "debug", .key = 128,
1538
.doc = "Debug mode", .group = 3 },
1539
{ .name = "connect", .key = 'c',
1540
.arg = "ADDRESS:PORT",
1541
.doc = "Connect directly to a specific Mandos server",
1543
{ .name = "interface", .key = 'i',
1545
.doc = "Network interface that will be used to search for"
1548
{ .name = "seckey", .key = 's',
1550
.doc = "OpenPGP secret key file base name",
1552
{ .name = "pubkey", .key = 'p',
1554
.doc = "OpenPGP public key file base name",
1556
{ .name = "dh-bits", .key = 129,
1558
.doc = "Bit length of the prime number used in the"
1559
" Diffie-Hellman key exchange",
1561
{ .name = "priority", .key = 130,
1563
.doc = "GnuTLS priority string for the TLS handshake",
1565
{ .name = "delay", .key = 131,
1567
.doc = "Maximum delay to wait for interface startup",
1569
{ .name = "retry", .key = 132,
1571
.doc = "Retry interval used when denied by the mandos server",
1573
{ .name = "network-hook-dir", .key = 133,
1575
.doc = "Directory where network hooks are located",
1578
* These reproduce what we would get without ARGP_NO_HELP
1580
{ .name = "help", .key = '?',
1581
.doc = "Give this help list", .group = -1 },
1582
{ .name = "usage", .key = -3,
1583
.doc = "Give a short usage message", .group = -1 },
1584
{ .name = "version", .key = 'V',
1585
.doc = "Print program version", .group = -1 },
1589
error_t parse_opt(int key, char *arg,
1590
struct argp_state *state){
1593
case 128: /* --debug */
1596
case 'c': /* --connect */
1599
case 'i': /* --interface */
1602
case 's': /* --seckey */
1605
case 'p': /* --pubkey */
1608
case 129: /* --dh-bits */
1610
tmpmax = strtoimax(arg, &tmp, 10);
1611
if(errno != 0 or tmp == arg or *tmp != '\0'
1612
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1613
argp_error(state, "Bad number of DH bits");
1615
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1617
case 130: /* --priority */
1620
case 131: /* --delay */
1622
delay = strtof(arg, &tmp);
1623
if(errno != 0 or tmp == arg or *tmp != '\0'){
1624
argp_error(state, "Bad delay");
1626
case 132: /* --retry */
1628
retry_interval = strtod(arg, &tmp);
1629
if(errno != 0 or tmp == arg or *tmp != '\0'
1630
or (retry_interval * 1000) > INT_MAX
1631
or retry_interval < 0){
1632
argp_error(state, "Bad retry interval");
1635
case 133: /* --network-hook-dir */
1639
* These reproduce what we would get without ARGP_NO_HELP
1641
case '?': /* --help */
1642
argp_state_help(state, state->out_stream,
1643
(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)
1644
& ~(unsigned int)ARGP_HELP_EXIT_OK);
1645
case -3: /* --usage */
1646
argp_state_help(state, state->out_stream,
1647
ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);
1648
case 'V': /* --version */
1649
fprintf_plus(state->out_stream,
1650
"Mandos plugin mandos-client: ");
1651
fprintf_plus(state->out_stream, "%s\n", argp_program_version);
1652
exit(argp_err_exit_status);
1655
return ARGP_ERR_UNKNOWN;
1660
struct argp argp = { .options = options, .parser = parse_opt,
1662
.doc = "Mandos client -- Get and decrypt"
1663
" passwords from a Mandos server" };
1664
ret = argp_parse(&argp, argc, argv,
1665
ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);
1672
perror_plus("argp_parse");
1673
exitcode = EX_OSERR;
1676
exitcode = EX_USAGE;
1682
/* Work around Debian bug #633582:
1683
<http://bugs.debian.org/633582> */
1686
/* Re-raise priviliges */
1690
perror_plus("seteuid");
1693
if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){
1694
int seckey_fd = open(seckey, O_RDONLY);
1695
if(seckey_fd == -1){
1696
perror_plus("open");
1698
ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));
1700
perror_plus("fstat");
1702
if(S_ISREG(st.st_mode)
1703
and st.st_uid == 0 and st.st_gid == 0){
1704
ret = fchown(seckey_fd, uid, gid);
1706
perror_plus("fchown");
1710
TEMP_FAILURE_RETRY(close(seckey_fd));
1714
if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){
1715
int pubkey_fd = open(pubkey, O_RDONLY);
1716
if(pubkey_fd == -1){
1717
perror_plus("open");
1719
ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));
1721
perror_plus("fstat");
1723
if(S_ISREG(st.st_mode)
1724
and st.st_uid == 0 and st.st_gid == 0){
1725
ret = fchown(pubkey_fd, uid, gid);
1727
perror_plus("fchown");
1731
TEMP_FAILURE_RETRY(close(pubkey_fd));
1735
/* Lower privileges */
1739
perror_plus("seteuid");
1743
/* Run network hooks */
1746
/* Re-raise priviliges */
1750
perror_plus("seteuid");
1753
if(not run_network_hooks("start", interface, delay)){
1757
/* Lower privileges */
1761
perror_plus("seteuid");
1767
avahi_set_log_function(empty_log);
1770
if(interface[0] == '\0'){
1771
struct dirent **direntries;
1772
/* First look for interfaces that are up */
1773
ret = scandir(sys_class_net, &direntries, up_interface,
1776
/* No up interfaces, look for any good interfaces */
1778
ret = scandir(sys_class_net, &direntries, good_interface,
1782
/* Pick the first interface returned */
1783
interface = strdup(direntries[0]->d_name);
1785
fprintf_plus(stderr, "Using interface \"%s\"\n", interface);
1787
if(interface == NULL){
1788
perror_plus("malloc");
1790
exitcode = EXIT_FAILURE;
1796
fprintf_plus(stderr, "Could not find a network interface\n");
793
AvahiSServiceBrowser *sb = NULL;
796
int exitcode = EXIT_SUCCESS;
797
const char *interface = "eth0";
798
struct ifreq network;
802
char *connect_to = NULL;
803
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
804
const char *pubkeyfile = "pubkey.txt";
805
const char *seckeyfile = "seckey.txt";
806
mandos_context mc = { .simple_poll = NULL, .server = NULL,
807
.dh_bits = 1024, .priority = "SECURE256"};
808
bool gnutls_initalized = false;
811
struct argp_option options[] = {
812
{ .name = "debug", .key = 128,
813
.doc = "Debug mode", .group = 3 },
814
{ .name = "connect", .key = 'c',
816
.doc = "Connect directly to a sepcified mandos server",
818
{ .name = "interface", .key = 'i',
820
.doc = "Interface that Avahi will conntect through",
822
{ .name = "keydir", .key = 'd',
824
.doc = "Directory where the openpgp keyring is",
826
{ .name = "seckey", .key = 's',
828
.doc = "Secret openpgp key for gnutls authentication",
830
{ .name = "pubkey", .key = 'p',
832
.doc = "Public openpgp key for gnutls authentication",
834
{ .name = "dh-bits", .key = 129,
836
.doc = "dh-bits to use in gnutls communication",
838
{ .name = "priority", .key = 130,
840
.doc = "GNUTLS priority", .group = 1 },
845
error_t parse_opt (int key, char *arg,
846
struct argp_state *state) {
847
/* Get the INPUT argument from `argp_parse', which we know is
848
a pointer to our plugin list pointer. */
870
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
885
return ARGP_ERR_UNKNOWN;
890
struct argp argp = { .options = options, .parser = parse_opt,
892
.doc = "Mandos client -- Get and decrypt"
893
" passwords from mandos server" };
894
argp_parse (&argp, argc, argv, 0, 0, NULL);
897
pubkeyfile = combinepath(keydir, pubkeyfile);
898
if (pubkeyfile == NULL){
899
perror("combinepath");
1797
900
exitcode = EXIT_FAILURE;
1802
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1803
from the signal handler */
1804
/* Initialize the pseudo-RNG for Avahi */
1805
srand((unsigned int) time(NULL));
1806
mc.simple_poll = avahi_simple_poll_new();
1807
if(mc.simple_poll == NULL){
1808
fprintf_plus(stderr,
1809
"Avahi: Failed to create simple poll object.\n");
1810
exitcode = EX_UNAVAILABLE;
1814
sigemptyset(&sigterm_action.sa_mask);
1815
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1817
perror_plus("sigaddset");
1818
exitcode = EX_OSERR;
1821
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1823
perror_plus("sigaddset");
1824
exitcode = EX_OSERR;
1827
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1829
perror_plus("sigaddset");
1830
exitcode = EX_OSERR;
1833
/* Need to check if the handler is SIG_IGN before handling:
1834
| [[info:libc:Initial Signal Actions]] |
1835
| [[info:libc:Basic Signal Handling]] |
1837
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1839
perror_plus("sigaction");
1842
if(old_sigterm_action.sa_handler != SIG_IGN){
1843
ret = sigaction(SIGINT, &sigterm_action, NULL);
1845
perror_plus("sigaction");
1846
exitcode = EX_OSERR;
1850
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1852
perror_plus("sigaction");
1855
if(old_sigterm_action.sa_handler != SIG_IGN){
1856
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1858
perror_plus("sigaction");
1859
exitcode = EX_OSERR;
1863
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1865
perror_plus("sigaction");
1868
if(old_sigterm_action.sa_handler != SIG_IGN){
1869
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1871
perror_plus("sigaction");
1872
exitcode = EX_OSERR;
1877
/* If the interface is down, bring it up */
1878
if(strcmp(interface, "none") != 0){
904
seckeyfile = combinepath(keydir, seckeyfile);
905
if (seckeyfile == NULL){
906
perror("combinepath");
910
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
912
fprintf(stderr, "init_gnutls_global\n");
915
gnutls_initalized = true;
1879
931
if_index = (AvahiIfIndex) if_nametoindex(interface);
1880
932
if(if_index == 0){
1881
fprintf_plus(stderr, "No such interface: \"%s\"\n", interface);
1882
exitcode = EX_UNAVAILABLE;
1890
/* Re-raise priviliges */
1894
perror_plus("seteuid");
1898
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1899
messages about the network interface to mess up the prompt */
1900
ret = klogctl(8, NULL, 5);
1901
bool restore_loglevel = true;
1903
restore_loglevel = false;
1904
perror_plus("klogctl");
1906
#endif /* __linux__ */
1908
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
1910
perror_plus("socket");
1911
exitcode = EX_OSERR;
1913
if(restore_loglevel){
1914
ret = klogctl(7, NULL, 0);
1916
perror_plus("klogctl");
1919
#endif /* __linux__ */
1920
/* Lower privileges */
1924
perror_plus("seteuid");
1928
strcpy(network.ifr_name, interface);
1929
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1931
perror_plus("ioctl SIOCGIFFLAGS");
1933
if(restore_loglevel){
1934
ret = klogctl(7, NULL, 0);
1936
perror_plus("klogctl");
1939
#endif /* __linux__ */
1940
exitcode = EX_OSERR;
1941
/* Lower privileges */
1945
perror_plus("seteuid");
1949
if((network.ifr_flags & IFF_UP) == 0){
1950
network.ifr_flags |= IFF_UP;
1951
take_down_interface = true;
1952
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1954
take_down_interface = false;
1955
perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");
1956
exitcode = EX_OSERR;
1958
if(restore_loglevel){
1959
ret = klogctl(7, NULL, 0);
1961
perror_plus("klogctl");
1964
#endif /* __linux__ */
1965
/* Lower privileges */
1969
perror_plus("seteuid");
1974
/* Sleep checking until interface is running.
1975
Check every 0.25s, up to total time of delay */
1976
for(int i=0; i < delay * 4; i++){
933
fprintf(stderr, "No such interface: \"%s\"\n", interface);
937
if(connect_to != NULL){
938
/* Connect directly, do not use Zeroconf */
939
/* (Mainly meant for debugging) */
940
char *address = strrchr(connect_to, ':');
942
fprintf(stderr, "No colon in address\n");
943
exitcode = EXIT_FAILURE;
947
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
949
perror("Bad port number");
950
exitcode = EXIT_FAILURE;
954
address = connect_to;
955
ret = start_mandos_communication(address, port, if_index, &mc);
957
exitcode = EXIT_FAILURE;
959
exitcode = EXIT_SUCCESS;
964
/* If the interface is down, bring it up */
966
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
969
exitcode = EXIT_FAILURE;
972
strcpy(network.ifr_name, interface); /* Spurious warning */
1977
973
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1979
perror_plus("ioctl SIOCGIFFLAGS");
1980
} else if(network.ifr_flags & IFF_RUNNING){
1983
struct timespec sleeptime = { .tv_nsec = 250000000 };
1984
ret = nanosleep(&sleeptime, NULL);
1985
if(ret == -1 and errno != EINTR){
1986
perror_plus("nanosleep");
1989
if(not take_down_interface){
1990
/* We won't need the socket anymore */
1991
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1993
perror_plus("close");
1997
if(restore_loglevel){
1998
/* Restores kernel loglevel to default */
1999
ret = klogctl(7, NULL, 0);
2001
perror_plus("klogctl");
2004
#endif /* __linux__ */
2005
/* Lower privileges */
2007
/* Lower privileges */
2010
perror_plus("seteuid");
2018
ret = init_gnutls_global(pubkey, seckey);
2020
fprintf_plus(stderr, "init_gnutls_global failed\n");
2021
exitcode = EX_UNAVAILABLE;
2024
gnutls_initialized = true;
2031
if(mkdtemp(tempdir) == NULL){
2032
perror_plus("mkdtemp");
2035
tempdir_created = true;
2041
if(not init_gpgme(pubkey, seckey, tempdir)){
2042
fprintf_plus(stderr, "init_gpgme failed\n");
2043
exitcode = EX_UNAVAILABLE;
2046
gpgme_initialized = true;
2053
if(connect_to != NULL){
2054
/* Connect directly, do not use Zeroconf */
2055
/* (Mainly meant for debugging) */
2056
char *address = strrchr(connect_to, ':');
2057
if(address == NULL){
2058
fprintf_plus(stderr, "No colon in address\n");
2059
exitcode = EX_USAGE;
2069
tmpmax = strtoimax(address+1, &tmp, 10);
2070
if(errno != 0 or tmp == address+1 or *tmp != '\0'
2071
or tmpmax != (uint16_t)tmpmax){
2072
fprintf_plus(stderr, "Bad port number\n");
2073
exitcode = EX_USAGE;
2081
port = (uint16_t)tmpmax;
2083
/* Colon in address indicates IPv6 */
2085
if(strchr(connect_to, ':') != NULL){
2087
/* Accept [] around IPv6 address - see RFC 5952 */
2088
if(connect_to[0] == '[' and address[-1] == ']')
975
perror("ioctl SIOCGIFFLAGS");
976
exitcode = EXIT_FAILURE;
979
if((network.ifr_flags & IFF_UP) == 0){
980
network.ifr_flags |= IFF_UP;
981
ret = ioctl(sd, SIOCSIFFLAGS, &network);
983
perror("ioctl SIOCSIFFLAGS");
984
exitcode = EXIT_FAILURE;
2096
address = connect_to;
2102
while(not quit_now){
2103
ret = start_mandos_communication(address, port, if_index, af);
2104
if(quit_now or ret == 0){
2108
fprintf_plus(stderr, "Retrying in %d seconds\n",
2109
(int)retry_interval);
2111
sleep((int)retry_interval);
2115
exitcode = EXIT_SUCCESS;
2126
AvahiServerConfig config;
2127
/* Do not publish any local Zeroconf records */
2128
avahi_server_config_init(&config);
2129
config.publish_hinfo = 0;
2130
config.publish_addresses = 0;
2131
config.publish_workstation = 0;
2132
config.publish_domain = 0;
2134
/* Allocate a new server */
2135
mc.server = avahi_server_new(avahi_simple_poll_get
2136
(mc.simple_poll), &config, NULL,
2139
/* Free the Avahi configuration data */
2140
avahi_server_config_free(&config);
2143
/* Check if creating the Avahi server object succeeded */
2144
if(mc.server == NULL){
2145
fprintf_plus(stderr, "Failed to create Avahi server: %s\n",
2146
avahi_strerror(error));
2147
exitcode = EX_UNAVAILABLE;
2155
/* Create the Avahi service browser */
2156
sb = avahi_s_service_browser_new(mc.server, if_index,
2157
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
2158
NULL, 0, browse_callback, NULL);
2160
fprintf_plus(stderr, "Failed to create service browser: %s\n",
2161
avahi_strerror(avahi_server_errno(mc.server)));
2162
exitcode = EX_UNAVAILABLE;
2170
/* Run the main loop */
2173
fprintf_plus(stderr, "Starting Avahi loop search\n");
2176
ret = avahi_loop_with_timeout(mc.simple_poll,
2177
(int)(retry_interval * 1000));
2179
fprintf_plus(stderr, "avahi_loop_with_timeout exited %s\n",
2180
(ret == 0) ? "successfully" : "with error");
992
avahi_set_log_function(empty_log);
995
/* Initialize the pseudo-RNG for Avahi */
996
srand((unsigned int) time(NULL));
998
/* Allocate main Avahi loop object */
999
mc.simple_poll = avahi_simple_poll_new();
1000
if (mc.simple_poll == NULL) {
1001
fprintf(stderr, "Avahi: Failed to create simple poll"
1003
exitcode = EXIT_FAILURE;
1008
AvahiServerConfig config;
1009
/* Do not publish any local Zeroconf records */
1010
avahi_server_config_init(&config);
1011
config.publish_hinfo = 0;
1012
config.publish_addresses = 0;
1013
config.publish_workstation = 0;
1014
config.publish_domain = 0;
1016
/* Allocate a new server */
1017
mc.server = avahi_server_new(avahi_simple_poll_get
1018
(mc.simple_poll), &config, NULL,
1021
/* Free the Avahi configuration data */
1022
avahi_server_config_free(&config);
1025
/* Check if creating the Avahi server object succeeded */
1026
if (mc.server == NULL) {
1027
fprintf(stderr, "Failed to create Avahi server: %s\n",
1028
avahi_strerror(error));
1029
exitcode = EXIT_FAILURE;
1033
/* Create the Avahi service browser */
1034
sb = avahi_s_service_browser_new(mc.server, if_index,
1036
"_mandos._tcp", NULL, 0,
1037
browse_callback, &mc);
1039
fprintf(stderr, "Failed to create service browser: %s\n",
1040
avahi_strerror(avahi_server_errno(mc.server)));
1041
exitcode = EXIT_FAILURE;
1045
/* Run the main loop */
1048
fprintf(stderr, "Starting Avahi loop search\n");
1051
avahi_simple_poll_loop(mc.simple_poll);
2186
fprintf_plus(stderr, "%s exiting\n", argv[0]);
2189
/* Cleanup things */
2191
avahi_s_service_browser_free(sb);
2193
if(mc.server != NULL)
2194
avahi_server_free(mc.server);
2196
if(mc.simple_poll != NULL)
2197
avahi_simple_poll_free(mc.simple_poll);
2199
if(gnutls_initialized){
2200
gnutls_certificate_free_credentials(mc.cred);
2201
gnutls_global_deinit();
2202
gnutls_dh_params_deinit(mc.dh_params);
2205
if(gpgme_initialized){
2206
gpgme_release(mc.ctx);
2209
/* Cleans up the circular linked list of Mandos servers the client
2211
if(mc.current_server != NULL){
2212
mc.current_server->prev->next = NULL;
2213
while(mc.current_server != NULL){
2214
server *next = mc.current_server->next;
2215
free(mc.current_server);
2216
mc.current_server = next;
2220
/* Re-raise priviliges */
2226
perror_plus("seteuid");
2230
/* Run network hooks */
2231
run_network_hooks("stop", interface, delay);
2233
/* Take down the network interface */
2234
if(take_down_interface and geteuid() == 0){
2235
ret = ioctl(sd, SIOCGIFFLAGS, &network);
2237
perror_plus("ioctl SIOCGIFFLAGS");
2238
} else if(network.ifr_flags & IFF_UP){
2239
network.ifr_flags &= ~(short)IFF_UP; /* clear flag */
2240
ret = ioctl(sd, SIOCSIFFLAGS, &network);
2242
perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");
2245
ret = (int)TEMP_FAILURE_RETRY(close(sd));
2247
perror_plus("close");
2252
/* Lower privileges permanently */
2256
perror_plus("setuid");
2260
/* Removes the GPGME temp directory and all files inside */
2261
if(tempdir_created){
2262
struct dirent **direntries = NULL;
2263
struct dirent *direntry = NULL;
2264
int numentries = scandir(tempdir, &direntries, notdotentries,
2266
if (numentries > 0){
2267
for(int i = 0; i < numentries; i++){
2268
direntry = direntries[i];
2269
char *fullname = NULL;
2270
ret = asprintf(&fullname, "%s/%s", tempdir,
2273
perror_plus("asprintf");
2276
ret = remove(fullname);
2278
fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,
2285
/* need to clean even if 0 because man page doesn't specify */
2287
if (numentries == -1){
2288
perror_plus("scandir");
2290
ret = rmdir(tempdir);
2291
if(ret == -1 and errno != ENOENT){
2292
perror_plus("rmdir");
2297
sigemptyset(&old_sigterm_action.sa_mask);
2298
old_sigterm_action.sa_handler = SIG_DFL;
2299
ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,
2300
&old_sigterm_action,
2303
perror_plus("sigaction");
2306
ret = raise(signal_received);
2307
} while(ret != 0 and errno == EINTR);
2309
perror_plus("raise");
2312
TEMP_FAILURE_RETRY(pause());
1056
fprintf(stderr, "%s exiting\n", argv[0]);
1059
/* Cleanup things */
1061
avahi_s_service_browser_free(sb);
1063
if (mc.server != NULL)
1064
avahi_server_free(mc.server);
1066
if (mc.simple_poll != NULL)
1067
avahi_simple_poll_free(mc.simple_poll);
1071
if (gnutls_initalized){
1072
gnutls_certificate_free_credentials (mc.cred);
1073
gnutls_global_deinit ();