31
32
/* Needed by GPGME, specifically gpgme_data_seek() */
33
#ifndef _LARGEFILE_SOURCE
32
34
#define _LARGEFILE_SOURCE
36
#ifndef _FILE_OFFSET_BITS
33
37
#define _FILE_OFFSET_BITS 64
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
41
#include <net/if.h> // ioctl, ifreq, SIOCGIFFLAGS, IFF_UP, SIOCSIFFLAGS
40
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
42
#include <stdio.h> /* fprintf(), stderr, fwrite(),
43
stdout, ferror(), remove() */
44
#include <stdint.h> /* uint16_t, uint32_t */
45
#include <stddef.h> /* NULL, size_t, ssize_t */
46
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
48
#include <stdbool.h> /* bool, false, true */
49
#include <string.h> /* memset(), strcmp(), strlen(),
50
strerror(), asprintf(), strcpy() */
51
#include <sys/ioctl.h> /* ioctl */
52
#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() */
57
#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
#include <time.h> /* nanosleep(), time() */
67
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
69
if_nametoindex(), IF_NAMESIZE */
70
#include <netinet/in.h> /* IN6_IS_ADDR_LINKLOCAL,
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INET_ADDRSTRLEN, INET6_ADDRSTRLEN
73
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
74
getuid(), getgid(), seteuid(),
76
#include <arpa/inet.h> /* inet_pton(), htons */
77
#include <iso646.h> /* not, or, and */
78
#include <argp.h> /* struct argp_option, error_t, struct
79
argp_state, struct argp,
80
argp_parse(), ARGP_KEY_ARG,
81
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
82
#include <signal.h> /* sigemptyset(), sigaddset(),
83
sigaction(), SIGTERM, sig_atomic_t,
87
#include <sys/klog.h> /* klogctl() */
88
#endif /* __linux__ */
91
/* All Avahi types, constants and functions
43
94
#include <avahi-core/core.h>
44
95
#include <avahi-core/lookup.h>
45
96
#include <avahi-core/log.h>
47
98
#include <avahi-common/malloc.h>
48
99
#include <avahi-common/error.h>
51
#include <sys/types.h> /* socket(), inet_pton() */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton() */
54
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
55
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
57
#include <unistd.h> /* close() */
58
#include <netinet/in.h>
59
#include <stdbool.h> /* true */
60
#include <string.h> /* memset */
61
#include <arpa/inet.h> /* inet_pton() */
62
#include <iso646.h> /* not */
65
#include <errno.h> /* perror() */
102
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
105
init_gnutls_session(),
107
#include <gnutls/openpgp.h>
108
/* gnutls_certificate_set_openpgp_key_file(),
109
GNUTLS_OPENPGP_FMT_BASE64 */
112
#include <gpgme.h> /* All GPGME types, constants and
115
GPGME_PROTOCOL_OpenPGP,
71
118
#define BUFFER_SIZE 256
73
static const char *keydir = "/conf/conf.d/mandos";
74
static const char *pubkeyfile = "pubkey.txt";
75
static const char *seckeyfile = "seckey.txt";
120
#define PATHDIR "/conf/conf.d/mandos"
121
#define SECKEY "seckey.txt"
122
#define PUBKEY "pubkey.txt"
77
124
bool debug = false;
125
static const char mandos_protocol_version[] = "1";
126
const char *argp_program_version = "mandos-client " VERSION;
127
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
79
/* Used for passing in values through all the callback functions */
129
/* Used for passing in values through the Avahi callback functions */
81
131
AvahiSimplePoll *simple_poll;
82
132
AvahiServer *server;
83
133
gnutls_certificate_credentials_t cred;
84
134
unsigned int dh_bits;
135
gnutls_dh_params_t dh_params;
85
136
const char *priority;
88
static ssize_t pgp_packet_decrypt (char *packet, size_t packet_size,
91
gpgme_data_t dh_crypto, dh_plain;
140
/* global context so signal handler can reach it*/
141
mandos_context mc = { .simple_poll = NULL, .server = NULL,
142
.dh_bits = 1024, .priority = "SECURE256"
143
":!CTYPE-X.509:+CTYPE-OPENPGP" };
146
* Make additional room in "buffer" for at least BUFFER_SIZE more
147
* bytes. "buffer_capacity" is how much is currently allocated,
148
* "buffer_length" is how much is already used.
150
size_t incbuffer(char **buffer, size_t buffer_length,
151
size_t buffer_capacity){
152
if(buffer_length + BUFFER_SIZE > buffer_capacity){
153
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
157
buffer_capacity += BUFFER_SIZE;
159
return buffer_capacity;
165
static bool init_gpgme(const char *seckey,
166
const char *pubkey, const char *tempdir){
95
ssize_t new_packet_capacity = 0;
96
ssize_t new_packet_length = 0;
97
168
gpgme_engine_info_t engine_info;
100
fprintf(stderr, "Trying to decrypt OpenPGP packet\n");
172
* Helper function to insert pub and seckey to the engine keyring.
174
bool import_key(const char *filename){
177
gpgme_data_t pgp_data;
179
fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
185
rc = gpgme_data_new_from_fd(&pgp_data, fd);
186
if(rc != GPG_ERR_NO_ERROR){
187
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
188
gpgme_strsource(rc), gpgme_strerror(rc));
192
rc = gpgme_op_import(mc.ctx, pgp_data);
193
if(rc != GPG_ERR_NO_ERROR){
194
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
195
gpgme_strsource(rc), gpgme_strerror(rc));
199
ret = (int)TEMP_FAILURE_RETRY(close(fd));
203
gpgme_data_release(pgp_data);
208
fprintf(stderr, "Initializing GPGME\n");
104
212
gpgme_check_version(NULL);
105
213
rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);
106
if (rc != GPG_ERR_NO_ERROR){
214
if(rc != GPG_ERR_NO_ERROR){
107
215
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
108
216
gpgme_strsource(rc), gpgme_strerror(rc));
112
/* Set GPGME home directory */
113
rc = gpgme_get_engine_info (&engine_info);
114
if (rc != GPG_ERR_NO_ERROR){
220
/* Set GPGME home directory for the OpenPGP engine only */
221
rc = gpgme_get_engine_info(&engine_info);
222
if(rc != GPG_ERR_NO_ERROR){
115
223
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
116
224
gpgme_strsource(rc), gpgme_strerror(rc));
119
227
while(engine_info != NULL){
120
228
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
121
229
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
122
engine_info->file_name, homedir);
230
engine_info->file_name, tempdir);
125
233
engine_info = engine_info->next;
127
235
if(engine_info == NULL){
128
fprintf(stderr, "Could not set home dir to %s\n", homedir);
132
/* Create new GPGME data buffer from packet buffer */
133
rc = gpgme_data_new_from_mem(&dh_crypto, packet, packet_size, 0);
134
if (rc != GPG_ERR_NO_ERROR){
236
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
240
/* Create new GPGME "context" */
241
rc = gpgme_new(&(mc.ctx));
242
if(rc != GPG_ERR_NO_ERROR){
243
fprintf(stderr, "bad gpgme_new: %s: %s\n",
244
gpgme_strsource(rc), gpgme_strerror(rc));
248
if(not import_key(pubkey) or not import_key(seckey)){
256
* Decrypt OpenPGP data.
257
* Returns -1 on error
259
static ssize_t pgp_packet_decrypt(const char *cryptotext,
262
gpgme_data_t dh_crypto, dh_plain;
265
size_t plaintext_capacity = 0;
266
ssize_t plaintext_length = 0;
269
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
272
/* Create new GPGME data buffer from memory cryptotext */
273
rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,
275
if(rc != GPG_ERR_NO_ERROR){
135
276
fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",
136
277
gpgme_strsource(rc), gpgme_strerror(rc));
198
/* Delete the GPGME FILE pointer cryptotext data buffer */
199
gpgme_data_release(dh_crypto);
327
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
201
330
/* Seek back to the beginning of the GPGME plaintext data buffer */
202
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
203
perror("pgpme_data_seek");
331
if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){
332
perror("gpgme_data_seek");
333
plaintext_length = -1;
208
if (new_packet_length + BUFFER_SIZE > new_packet_capacity){
209
*new_packet = realloc(*new_packet,
210
(unsigned int)new_packet_capacity
212
if (*new_packet == NULL){
216
new_packet_capacity += BUFFER_SIZE;
339
plaintext_capacity = incbuffer(plaintext,
340
(size_t)plaintext_length,
342
if(plaintext_capacity == 0){
344
plaintext_length = -1;
219
ret = gpgme_data_read(dh_plain, *new_packet + new_packet_length,
348
ret = gpgme_data_read(dh_plain, *plaintext + plaintext_length,
221
350
/* Print the data, if any */
226
356
perror("gpgme_data_read");
229
new_packet_length += ret;
232
/* FIXME: check characters before printing to screen so to not print
233
terminal control characters */
235
/* fprintf(stderr, "decrypted password is: "); */
236
/* fwrite(*new_packet, 1, new_packet_length, stderr); */
237
/* fprintf(stderr, "\n"); */
357
plaintext_length = -1;
360
plaintext_length += ret;
364
fprintf(stderr, "Decrypted password is: ");
365
for(ssize_t i = 0; i < plaintext_length; i++){
366
fprintf(stderr, "%02hhX ", (*plaintext)[i]);
368
fprintf(stderr, "\n");
373
/* Delete the GPGME cryptotext data buffer */
374
gpgme_data_release(dh_crypto);
240
376
/* Delete the GPGME plaintext data buffer */
241
377
gpgme_data_release(dh_plain);
242
return new_packet_length;
378
return plaintext_length;
245
static const char * safer_gnutls_strerror (int value) {
246
const char *ret = gnutls_strerror (value);
381
static const char * safer_gnutls_strerror(int value){
382
const char *ret = gnutls_strerror(value); /* Spurious warning from
383
-Wunreachable-code */
248
385
ret = "(unknown)";
389
/* GnuTLS log function callback */
252
390
static void debuggnutls(__attribute__((unused)) int level,
253
391
const char* string){
254
fprintf(stderr, "%s", string);
392
fprintf(stderr, "GnuTLS: %s", string);
257
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
258
gnutls_dh_params_t *dh_params){
395
static int init_gnutls_global(const char *pubkeyfilename,
396
const char *seckeyfilename){
263
400
fprintf(stderr, "Initializing GnuTLS\n");
266
if ((ret = gnutls_global_init ())
267
!= GNUTLS_E_SUCCESS) {
268
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
403
ret = gnutls_global_init();
404
if(ret != GNUTLS_E_SUCCESS){
405
fprintf(stderr, "GnuTLS global_init: %s\n",
406
safer_gnutls_strerror(ret));
411
/* "Use a log level over 10 to enable all debugging options."
273
414
gnutls_global_set_log_level(11);
274
415
gnutls_global_set_log_function(debuggnutls);
277
/* openpgp credentials */
278
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
279
!= GNUTLS_E_SUCCESS) {
280
fprintf (stderr, "memory error: %s\n",
281
safer_gnutls_strerror(ret));
418
/* OpenPGP credentials */
419
gnutls_certificate_allocate_credentials(&mc.cred);
420
if(ret != GNUTLS_E_SUCCESS){
421
fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning
425
safer_gnutls_strerror(ret));
426
gnutls_global_deinit();
286
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
287
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
431
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
432
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
291
436
ret = gnutls_certificate_set_openpgp_key_file
292
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
293
if (ret != GNUTLS_E_SUCCESS) {
295
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
297
ret, pubkeyfile, seckeyfile);
298
fprintf(stdout, "The Error is: %s\n",
299
safer_gnutls_strerror(ret));
303
//GnuTLS server initialization
304
if ((ret = gnutls_dh_params_init(dh_params))
305
!= GNUTLS_E_SUCCESS) {
306
fprintf (stderr, "Error in dh parameter initialization: %s\n",
307
safer_gnutls_strerror(ret));
311
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
312
!= GNUTLS_E_SUCCESS) {
313
fprintf (stderr, "Error in prime generation: %s\n",
314
safer_gnutls_strerror(ret));
318
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
320
// GnuTLS session creation
321
if ((ret = gnutls_init(session, GNUTLS_SERVER))
322
!= GNUTLS_E_SUCCESS){
437
(mc.cred, pubkeyfilename, seckeyfilename,
438
GNUTLS_OPENPGP_FMT_BASE64);
439
if(ret != GNUTLS_E_SUCCESS){
441
"Error[%d] while reading the OpenPGP key pair ('%s',"
442
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
443
fprintf(stderr, "The GnuTLS error is: %s\n",
444
safer_gnutls_strerror(ret));
448
/* GnuTLS server initialization */
449
ret = gnutls_dh_params_init(&mc.dh_params);
450
if(ret != GNUTLS_E_SUCCESS){
451
fprintf(stderr, "Error in GnuTLS DH parameter initialization:"
452
" %s\n", safer_gnutls_strerror(ret));
455
ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);
456
if(ret != GNUTLS_E_SUCCESS){
457
fprintf(stderr, "Error in GnuTLS prime generation: %s\n",
458
safer_gnutls_strerror(ret));
462
gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);
468
gnutls_certificate_free_credentials(mc.cred);
469
gnutls_global_deinit();
470
gnutls_dh_params_deinit(mc.dh_params);
474
static int init_gnutls_session(gnutls_session_t *session){
476
/* GnuTLS session creation */
478
ret = gnutls_init(session, GNUTLS_SERVER);
479
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
480
if(ret != GNUTLS_E_SUCCESS){
323
481
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
324
482
safer_gnutls_strerror(ret));
327
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
328
!= GNUTLS_E_SUCCESS) {
329
fprintf(stderr, "Syntax error at: %s\n", err);
330
fprintf(stderr, "GnuTLS error: %s\n",
331
safer_gnutls_strerror(ret));
488
ret = gnutls_priority_set_direct(*session, mc.priority, &err);
489
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
490
if(ret != GNUTLS_E_SUCCESS){
491
fprintf(stderr, "Syntax error at: %s\n", err);
492
fprintf(stderr, "GnuTLS error: %s\n",
493
safer_gnutls_strerror(ret));
494
gnutls_deinit(*session);
335
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
337
!= GNUTLS_E_SUCCESS) {
338
fprintf(stderr, "Error setting a credentials set: %s\n",
500
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
502
} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);
503
if(ret != GNUTLS_E_SUCCESS){
504
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
339
505
safer_gnutls_strerror(ret));
506
gnutls_deinit(*session);
343
510
/* ignore client certificate if any. */
344
gnutls_certificate_server_set_request (*session,
511
gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);
347
gnutls_dh_set_prime_bits (*session, mc->dh_bits);
513
gnutls_dh_set_prime_bits(*session, mc.dh_bits);
518
/* Avahi log function callback */
352
519
static void empty_log(__attribute__((unused)) AvahiLogLevel level,
353
520
__attribute__((unused)) const char *txt){}
522
sig_atomic_t quit_now = 0;
523
int signal_received = 0;
525
/* Called when a Mandos server is found */
355
526
static int start_mandos_communication(const char *ip, uint16_t port,
356
527
AvahiIfIndex if_index,
359
struct sockaddr_in6 to;
529
int ret, tcp_sd = -1;
532
struct sockaddr_in in;
533
struct sockaddr_in6 in6;
360
535
char *buffer = NULL;
361
536
char *decrypted_buffer;
362
537
size_t buffer_length = 0;
363
538
size_t buffer_capacity = 0;
364
ssize_t decrypted_buffer_size;
367
char interface[IF_NAMESIZE];
368
541
gnutls_session_t session;
369
gnutls_dh_params_t dh_params;
542
int pf; /* Protocol family */
556
fprintf(stderr, "Bad address family: %d\n", af);
560
ret = init_gnutls_session(&session);
372
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
566
fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16
376
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
570
tcp_sd = socket(pf, SOCK_STREAM, 0);
378
572
perror("socket");
383
if(if_indextoname((unsigned int)if_index, interface) == NULL){
384
perror("if_indextoname");
387
fprintf(stderr, "Binding to interface %s\n", interface);
390
memset(&to,0,sizeof(to)); /* Spurious warning */
391
to.sin6_family = AF_INET6;
392
ret = inet_pton(AF_INET6, ip, &to.sin6_addr);
581
memset(&to, 0, sizeof(to));
583
to.in6.sin6_family = (sa_family_t)af;
584
ret = inet_pton(af, ip, &to.in6.sin6_addr);
586
to.in.sin_family = (sa_family_t)af;
587
ret = inet_pton(af, ip, &to.in.sin_addr);
394
590
perror("inet_pton");
398
595
fprintf(stderr, "Bad address: %s\n", ip);
401
to.sin6_port = htons(port); /* Spurious warning */
600
to.in6.sin6_port = htons(port); /* Spurious warnings from
602
-Wunreachable-code */
604
if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */
605
(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and
607
if(if_index == AVAHI_IF_UNSPEC){
608
fprintf(stderr, "An IPv6 link-local address is incomplete"
609
" without a network interface\n");
613
/* Set the network interface number as scope */
614
to.in6.sin6_scope_id = (uint32_t)if_index;
617
to.in.sin_port = htons(port); /* Spurious warnings from
619
-Wunreachable-code */
403
to.sin6_scope_id = (uint32_t)if_index;
406
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
407
char addrstr[INET6_ADDRSTRLEN] = "";
408
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
409
sizeof(addrstr)) == NULL){
627
if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){
628
char interface[IF_NAMESIZE];
629
if(if_indextoname((unsigned int)if_index, interface) == NULL){
630
perror("if_indextoname");
632
fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",
633
ip, interface, port);
636
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
639
char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?
640
INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";
643
pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,
646
pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,
410
650
perror("inet_ntop");
412
652
if(strcmp(addrstr, ip) != 0){
418
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
663
ret = connect(tcp_sd, &to.in6, sizeof(to));
665
ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */
420
668
perror("connect");
424
ret = initgnutls (mc, &session, &dh_params);
430
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
677
const char *out = mandos_protocol_version;
680
size_t out_size = strlen(out);
681
ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
682
out_size - written));
688
written += (size_t)ret;
689
if(written < out_size){
692
if(out == mandos_protocol_version){
433
706
fprintf(stderr, "Establishing TLS session with %s\n", ip);
436
ret = gnutls_handshake (session);
438
if (ret != GNUTLS_E_SUCCESS){
713
gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);
720
ret = gnutls_handshake(session);
724
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
726
if(ret != GNUTLS_E_SUCCESS){
440
fprintf(stderr, "\n*** Handshake failed ***\n");
728
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
447
//Retrieve OpenPGP packet that contains the wanted password
735
/* Read OpenPGP packet that contains the wanted password */
450
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
738
fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",
455
if (buffer_length + BUFFER_SIZE > buffer_capacity){
456
buffer = realloc(buffer, buffer_capacity + BUFFER_SIZE);
461
buffer_capacity += BUFFER_SIZE;
464
ret = gnutls_record_recv(session, buffer+buffer_length,
748
buffer_capacity = incbuffer(&buffer, buffer_length,
750
if(buffer_capacity == 0){
760
sret = gnutls_record_recv(session, buffer+buffer_length,
471
767
case GNUTLS_E_INTERRUPTED:
472
768
case GNUTLS_E_AGAIN:
474
770
case GNUTLS_E_REHANDSHAKE:
475
ret = gnutls_handshake (session);
477
fprintf(stderr, "\n*** Handshake failed ***\n");
772
ret = gnutls_handshake(session);
777
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
779
fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");
484
786
fprintf(stderr, "Unknown error while reading data from"
485
" encrypted session with mandos server\n");
787
" encrypted session with Mandos server\n");
487
gnutls_bye (session, GNUTLS_SHUT_RDWR);
789
gnutls_bye(session, GNUTLS_SHUT_RDWR);
491
buffer_length += (size_t) ret;
793
buffer_length += (size_t) sret;
495
if (buffer_length > 0){
798
fprintf(stderr, "Closing TLS session\n");
805
gnutls_bye(session, GNUTLS_SHUT_RDWR);
811
if(buffer_length > 0){
812
ssize_t decrypted_buffer_size;
496
813
decrypted_buffer_size = pgp_packet_decrypt(buffer,
500
if (decrypted_buffer_size >= 0){
816
if(decrypted_buffer_size >= 0){
501
819
while(written < (size_t) decrypted_buffer_size){
502
ret = (int)fwrite (decrypted_buffer + written, 1,
503
(size_t)decrypted_buffer_size - written,
824
ret = (int)fwrite(decrypted_buffer + written, 1,
825
(size_t)decrypted_buffer_size - written,
505
827
if(ret == 0 and ferror(stdout)){
507
829
fprintf(stderr, "Error writing encrypted data: %s\n",
622
956
case AVAHI_BROWSER_ALL_FOR_NOW:
623
957
case AVAHI_BROWSER_CACHE_EXHAUSTED:
959
fprintf(stderr, "No Mandos server found, still searching...\n");
628
/* Combines file name and path and returns the malloced new
629
string. some sane checks could/should be added */
630
static const char *combinepath(const char *first, const char *second){
631
size_t f_len = strlen(first);
632
size_t s_len = strlen(second);
633
char *tmp = malloc(f_len + s_len + 2);
638
memcpy(tmp, first, f_len); /* Spurious warning */
642
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
644
tmp[f_len + 1 + s_len] = '\0';
965
/* stop main loop after sigterm has been called */
966
static void handle_sigterm(int sig){
971
signal_received = sig;
972
int old_errno = errno;
973
if(mc.simple_poll != NULL){
974
avahi_simple_poll_quit(mc.simple_poll);
649
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
650
AvahiServerConfig config;
651
AvahiSServiceBrowser *sb = NULL;
655
int returncode = EXIT_SUCCESS;
656
const char *interface = "eth0";
657
struct ifreq network;
659
char *connect_to = NULL;
660
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
661
mandos_context mc = { .simple_poll = NULL, .server = NULL,
662
.dh_bits = 1024, .priority = "SECURE256"};
979
int main(int argc, char *argv[]){
980
AvahiSServiceBrowser *sb = NULL;
985
int exitcode = EXIT_SUCCESS;
986
const char *interface = "eth0";
987
struct ifreq network;
989
bool take_down_interface = false;
992
char *connect_to = NULL;
993
char tempdir[] = "/tmp/mandosXXXXXX";
994
bool tempdir_created = false;
995
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
996
const char *seckey = PATHDIR "/" SECKEY;
997
const char *pubkey = PATHDIR "/" PUBKEY;
999
bool gnutls_initialized = false;
1000
bool gpgme_initialized = false;
1003
struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };
1004
struct sigaction sigterm_action = { .sa_handler = handle_sigterm };
1009
/* Lower any group privileges we might have, just to be safe */
1016
/* Lower user privileges (temporarily) */
1028
struct argp_option options[] = {
1029
{ .name = "debug", .key = 128,
1030
.doc = "Debug mode", .group = 3 },
1031
{ .name = "connect", .key = 'c',
1032
.arg = "ADDRESS:PORT",
1033
.doc = "Connect directly to a specific Mandos server",
1035
{ .name = "interface", .key = 'i',
1037
.doc = "Network interface that will be used to search for"
1040
{ .name = "seckey", .key = 's',
1042
.doc = "OpenPGP secret key file base name",
1044
{ .name = "pubkey", .key = 'p',
1046
.doc = "OpenPGP public key file base name",
1048
{ .name = "dh-bits", .key = 129,
1050
.doc = "Bit length of the prime number used in the"
1051
" Diffie-Hellman key exchange",
1053
{ .name = "priority", .key = 130,
1055
.doc = "GnuTLS priority string for the TLS handshake",
1057
{ .name = "delay", .key = 131,
1059
.doc = "Maximum delay to wait for interface startup",
664
debug_int = debug ? 1 : 0;
666
struct option long_options[] = {
667
{"debug", no_argument, &debug_int, 1},
668
{"connect", required_argument, NULL, 'c'},
669
{"interface", required_argument, NULL, 'i'},
670
{"keydir", required_argument, NULL, 'd'},
671
{"seckey", required_argument, NULL, 's'},
672
{"pubkey", required_argument, NULL, 'p'},
673
{"dh-bits", required_argument, NULL, 'D'},
674
{"priority", required_argument, NULL, 'P'},
677
int option_index = 0;
678
ret = getopt_long (argc, argv, "i:", long_options,
705
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
712
mc.priority = optarg;
1064
error_t parse_opt(int key, char *arg,
1065
struct argp_state *state){
1067
case 128: /* --debug */
1070
case 'c': /* --connect */
1073
case 'i': /* --interface */
1076
case 's': /* --seckey */
1079
case 'p': /* --pubkey */
1082
case 129: /* --dh-bits */
1084
tmpmax = strtoimax(arg, &tmp, 10);
1085
if(errno != 0 or tmp == arg or *tmp != '\0'
1086
or tmpmax != (typeof(mc.dh_bits))tmpmax){
1087
fprintf(stderr, "Bad number of DH bits\n");
1090
mc.dh_bits = (typeof(mc.dh_bits))tmpmax;
1092
case 130: /* --priority */
1095
case 131: /* --delay */
1097
delay = strtof(arg, &tmp);
1098
if(errno != 0 or tmp == arg or *tmp != '\0'){
1099
fprintf(stderr, "Bad delay\n");
1108
return ARGP_ERR_UNKNOWN;
719
debug = debug_int ? true : false;
721
pubkeyfile = combinepath(keydir, pubkeyfile);
722
if (pubkeyfile == NULL){
723
perror("combinepath");
724
returncode = EXIT_FAILURE;
728
seckeyfile = combinepath(keydir, seckeyfile);
729
if (seckeyfile == NULL){
730
perror("combinepath");
1113
struct argp argp = { .options = options, .parser = parse_opt,
1115
.doc = "Mandos client -- Get and decrypt"
1116
" passwords from a Mandos server" };
1117
ret = argp_parse(&argp, argc, argv, 0, 0, NULL);
1118
if(ret == ARGP_ERR_UNKNOWN){
1119
fprintf(stderr, "Unknown error while parsing arguments\n");
1120
exitcode = EXIT_FAILURE;
1126
avahi_set_log_function(empty_log);
1129
/* Initialize Avahi early so avahi_simple_poll_quit() can be called
1130
from the signal handler */
1131
/* Initialize the pseudo-RNG for Avahi */
1132
srand((unsigned int) time(NULL));
1133
mc.simple_poll = avahi_simple_poll_new();
1134
if(mc.simple_poll == NULL){
1135
fprintf(stderr, "Avahi: Failed to create simple poll object.\n");
1136
exitcode = EXIT_FAILURE;
1140
sigemptyset(&sigterm_action.sa_mask);
1141
ret = sigaddset(&sigterm_action.sa_mask, SIGINT);
1143
perror("sigaddset");
1144
exitcode = EXIT_FAILURE;
1147
ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);
1149
perror("sigaddset");
1150
exitcode = EXIT_FAILURE;
1153
ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);
1155
perror("sigaddset");
1156
exitcode = EXIT_FAILURE;
1159
/* Need to check if the handler is SIG_IGN before handling:
1160
| [[info:libc:Initial Signal Actions]] |
1161
| [[info:libc:Basic Signal Handling]] |
1163
ret = sigaction(SIGINT, NULL, &old_sigterm_action);
1165
perror("sigaction");
1166
return EXIT_FAILURE;
1168
if(old_sigterm_action.sa_handler != SIG_IGN){
1169
ret = sigaction(SIGINT, &sigterm_action, NULL);
1171
perror("sigaction");
1172
exitcode = EXIT_FAILURE;
1176
ret = sigaction(SIGHUP, NULL, &old_sigterm_action);
1178
perror("sigaction");
1179
return EXIT_FAILURE;
1181
if(old_sigterm_action.sa_handler != SIG_IGN){
1182
ret = sigaction(SIGHUP, &sigterm_action, NULL);
1184
perror("sigaction");
1185
exitcode = EXIT_FAILURE;
1189
ret = sigaction(SIGTERM, NULL, &old_sigterm_action);
1191
perror("sigaction");
1192
return EXIT_FAILURE;
1194
if(old_sigterm_action.sa_handler != SIG_IGN){
1195
ret = sigaction(SIGTERM, &sigterm_action, NULL);
1197
perror("sigaction");
1198
exitcode = EXIT_FAILURE;
1203
/* If the interface is down, bring it up */
1204
if(interface[0] != '\0'){
734
1205
if_index = (AvahiIfIndex) if_nametoindex(interface);
735
1206
if(if_index == 0){
736
1207
fprintf(stderr, "No such interface: \"%s\"\n", interface);
740
if(connect_to != NULL){
741
/* Connect directly, do not use Zeroconf */
742
/* (Mainly meant for debugging) */
743
char *address = strrchr(connect_to, ':');
745
fprintf(stderr, "No colon in address\n");
749
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
751
perror("Bad port number");
755
address = connect_to;
756
ret = start_mandos_communication(address, port, if_index, &mc);
1208
exitcode = EXIT_FAILURE;
1216
/* Re-raise priviliges */
1224
/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO
1225
messages to mess up the prompt */
1226
ret = klogctl(8, NULL, 5);
1227
bool restore_loglevel = true;
1229
restore_loglevel = false;
1232
#endif /* __linux__ */
764
1234
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
766
1236
perror("socket");
767
returncode = EXIT_FAILURE;
1237
exitcode = EXIT_FAILURE;
1239
if(restore_loglevel){
1240
ret = klogctl(7, NULL, 0);
1245
#endif /* __linux__ */
1246
/* Lower privileges */
770
strcpy(network.ifr_name, interface); /* Spurious warning */
1254
strcpy(network.ifr_name, interface);
771
1255
ret = ioctl(sd, SIOCGIFFLAGS, &network);
774
1257
perror("ioctl SIOCGIFFLAGS");
775
returncode = EXIT_FAILURE;
1259
if(restore_loglevel){
1260
ret = klogctl(7, NULL, 0);
1265
#endif /* __linux__ */
1266
exitcode = EXIT_FAILURE;
1267
/* Lower privileges */
778
1275
if((network.ifr_flags & IFF_UP) == 0){
779
1276
network.ifr_flags |= IFF_UP;
1277
take_down_interface = true;
780
1278
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1280
take_down_interface = false;
782
1281
perror("ioctl SIOCSIFFLAGS");
783
returncode = EXIT_FAILURE;
790
avahi_set_log_function(empty_log);
793
/* Initialize the psuedo-RNG */
794
srand((unsigned int) time(NULL));
796
/* Allocate main loop object */
797
if (!(mc.simple_poll = avahi_simple_poll_new())) {
798
fprintf(stderr, "Failed to create simple poll object.\n");
799
returncode = EXIT_FAILURE;
803
/* Do not publish any local records */
1282
exitcode = EXIT_FAILURE;
1284
if(restore_loglevel){
1285
ret = klogctl(7, NULL, 0);
1290
#endif /* __linux__ */
1291
/* Lower privileges */
1300
/* sleep checking until interface is running */
1301
for(int i=0; i < delay * 4; i++){
1302
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1304
perror("ioctl SIOCGIFFLAGS");
1305
} else if(network.ifr_flags & IFF_RUNNING){
1308
struct timespec sleeptime = { .tv_nsec = 250000000 };
1309
ret = nanosleep(&sleeptime, NULL);
1310
if(ret == -1 and errno != EINTR){
1311
perror("nanosleep");
1314
if(not take_down_interface){
1315
/* We won't need the socket anymore */
1316
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1322
if(restore_loglevel){
1323
/* Restores kernel loglevel to default */
1324
ret = klogctl(7, NULL, 0);
1329
#endif /* __linux__ */
1330
/* Lower privileges */
1332
if(take_down_interface){
1333
/* Lower privileges */
1339
/* Lower privileges permanently */
1351
ret = init_gnutls_global(pubkey, seckey);
1353
fprintf(stderr, "init_gnutls_global failed\n");
1354
exitcode = EXIT_FAILURE;
1357
gnutls_initialized = true;
1364
tempdir_created = true;
1365
if(mkdtemp(tempdir) == NULL){
1366
tempdir_created = false;
1375
if(not init_gpgme(pubkey, seckey, tempdir)){
1376
fprintf(stderr, "init_gpgme failed\n");
1377
exitcode = EXIT_FAILURE;
1380
gpgme_initialized = true;
1387
if(connect_to != NULL){
1388
/* Connect directly, do not use Zeroconf */
1389
/* (Mainly meant for debugging) */
1390
char *address = strrchr(connect_to, ':');
1391
if(address == NULL){
1392
fprintf(stderr, "No colon in address\n");
1393
exitcode = EXIT_FAILURE;
1403
tmpmax = strtoimax(address+1, &tmp, 10);
1404
if(errno != 0 or tmp == address+1 or *tmp != '\0'
1405
or tmpmax != (uint16_t)tmpmax){
1406
fprintf(stderr, "Bad port number\n");
1407
exitcode = EXIT_FAILURE;
1415
port = (uint16_t)tmpmax;
1417
address = connect_to;
1418
/* Colon in address indicates IPv6 */
1420
if(strchr(address, ':') != NULL){
1430
ret = start_mandos_communication(address, port, if_index, af);
1432
exitcode = EXIT_FAILURE;
1434
exitcode = EXIT_SUCCESS;
1444
AvahiServerConfig config;
1445
/* Do not publish any local Zeroconf records */
804
1446
avahi_server_config_init(&config);
805
1447
config.publish_hinfo = 0;
806
1448
config.publish_addresses = 0;
807
1449
config.publish_workstation = 0;
808
1450
config.publish_domain = 0;
810
1452
/* Allocate a new server */
811
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
812
&config, NULL, NULL, &error);
1453
mc.server = avahi_server_new(avahi_simple_poll_get
1454
(mc.simple_poll), &config, NULL,
814
/* Free the configuration data */
1457
/* Free the Avahi configuration data */
815
1458
avahi_server_config_free(&config);
817
/* Check if creating the server object succeeded */
819
fprintf(stderr, "Failed to create server: %s\n",
820
avahi_strerror(error));
821
returncode = EXIT_FAILURE;
825
/* Create the service browser */
826
sb = avahi_s_service_browser_new(mc.server, if_index,
828
"_mandos._tcp", NULL, 0,
829
browse_callback, &mc);
831
fprintf(stderr, "Failed to create service browser: %s\n",
832
avahi_strerror(avahi_server_errno(mc.server)));
833
returncode = EXIT_FAILURE;
837
/* Run the main loop */
840
fprintf(stderr, "Starting avahi loop search\n");
843
avahi_simple_poll_loop(mc.simple_poll);
848
fprintf(stderr, "%s exiting\n", argv[0]);
853
avahi_s_service_browser_free(sb);
856
avahi_server_free(mc.server);
859
avahi_simple_poll_free(mc.simple_poll);
1461
/* Check if creating the Avahi server object succeeded */
1462
if(mc.server == NULL){
1463
fprintf(stderr, "Failed to create Avahi server: %s\n",
1464
avahi_strerror(error));
1465
exitcode = EXIT_FAILURE;
1473
/* Create the Avahi service browser */
1474
sb = avahi_s_service_browser_new(mc.server, if_index,
1475
AVAHI_PROTO_UNSPEC, "_mandos._tcp",
1476
NULL, 0, browse_callback, NULL);
1478
fprintf(stderr, "Failed to create service browser: %s\n",
1479
avahi_strerror(avahi_server_errno(mc.server)));
1480
exitcode = EXIT_FAILURE;
1488
/* Run the main loop */
1491
fprintf(stderr, "Starting Avahi loop search\n");
1494
avahi_simple_poll_loop(mc.simple_poll);
1499
fprintf(stderr, "%s exiting\n", argv[0]);
1502
/* Cleanup things */
1504
avahi_s_service_browser_free(sb);
1506
if(mc.server != NULL)
1507
avahi_server_free(mc.server);
1509
if(mc.simple_poll != NULL)
1510
avahi_simple_poll_free(mc.simple_poll);
1512
if(gnutls_initialized){
1513
gnutls_certificate_free_credentials(mc.cred);
1514
gnutls_global_deinit();
1515
gnutls_dh_params_deinit(mc.dh_params);
1518
if(gpgme_initialized){
1519
gpgme_release(mc.ctx);
1522
/* Take down the network interface */
1523
if(take_down_interface){
1524
/* Re-raise priviliges */
1531
ret = ioctl(sd, SIOCGIFFLAGS, &network);
1533
perror("ioctl SIOCGIFFLAGS");
1534
} else if(network.ifr_flags & IFF_UP) {
1535
network.ifr_flags &= ~IFF_UP; /* clear flag */
1536
ret = ioctl(sd, SIOCSIFFLAGS, &network);
1538
perror("ioctl SIOCSIFFLAGS");
1541
ret = (int)TEMP_FAILURE_RETRY(close(sd));
1545
/* Lower privileges permanently */
1554
/* Removes the temp directory used by GPGME */
1555
if(tempdir_created){
1557
struct dirent *direntry;
1558
d = opendir(tempdir);
1560
if(errno != ENOENT){
1565
direntry = readdir(d);
1566
if(direntry == NULL){
1569
/* Skip "." and ".." */
1570
if(direntry->d_name[0] == '.'
1571
and (direntry->d_name[1] == '\0'
1572
or (direntry->d_name[1] == '.'
1573
and direntry->d_name[2] == '\0'))){
1576
char *fullname = NULL;
1577
ret = asprintf(&fullname, "%s/%s", tempdir,
1583
ret = remove(fullname);
1585
fprintf(stderr, "remove(\"%s\"): %s\n", fullname,
1592
ret = rmdir(tempdir);
1593
if(ret == -1 and errno != ENOENT){
1599
sigemptyset(&old_sigterm_action.sa_mask);
1600
old_sigterm_action.sa_handler = SIG_DFL;
1601
ret = sigaction(signal_received, &old_sigterm_action, NULL);
1603
perror("sigaction");
1605
raise(signal_received);