32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
41
#include <net/if.h> /* if_nametoindex */
42
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
39
#include <stdint.h> /* uint16_t, uint32_t */
40
#include <stddef.h> /* NULL, size_t, ssize_t */
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
#include <stdbool.h> /* bool, true */
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
sockaddr_in6, PF_INET6,
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
#include <inttypes.h> /* PRIu16 */
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
struct in6_addr, inet_pton(),
55
#include <assert.h> /* assert() */
56
#include <errno.h> /* perror(), errno */
57
#include <time.h> /* time() */
44
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
59
SIOCSIFFLAGS, if_indextoname(),
60
if_nametoindex(), IF_NAMESIZE */
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
62
getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
65
#include <arpa/inet.h> /* inet_pton(), htons */
66
#include <iso646.h> /* not, and */
67
#include <argp.h> /* struct argp_option, error_t, struct
68
argp_state, struct argp,
69
argp_parse(), ARGP_KEY_ARG,
70
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
73
/* All Avahi types, constants and functions
47
76
#include <avahi-core/core.h>
48
77
#include <avahi-core/lookup.h>
49
78
#include <avahi-core/log.h>
51
80
#include <avahi-common/malloc.h>
52
81
#include <avahi-common/error.h>
54
/* Mandos client part */
55
#include <sys/types.h> /* socket(), inet_pton() */
56
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
57
struct in6_addr, inet_pton() */
58
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
59
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
84
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and
87
init_gnutls_session(),
89
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
90
GNUTLS_OPENPGP_FMT_BASE64 */
61
#include <unistd.h> /* close() */
62
#include <netinet/in.h>
63
#include <stdbool.h> /* true */
64
#include <string.h> /* memset */
65
#include <arpa/inet.h> /* inet_pton() */
66
#include <iso646.h> /* not */
67
#include <net/if.h> /* IF_NAMESIZE */
68
#include <argp.h> /* struct argp_option,
69
struct argp_state, struct argp,
72
#include <errno.h> /* perror() */
93
#include <gpgme.h> /* All GPGME types, constants and
96
GPGME_PROTOCOL_OpenPGP,
75
99
#define BUFFER_SIZE 256
77
101
bool debug = false;
78
102
static const char *keydir = "/conf/conf.d/mandos";
79
const char *argp_program_version = "mandosclient 0.9";
103
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
80
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
81
static const char mandos_protocol_version[] = "1";
83
107
/* Used for passing in values through the Avahi callback functions */
90
114
const char *priority;
93
/* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
94
119
* "buffer_capacity" is how much is currently allocated,
95
* "buffer_length" is how much is already used. */
120
* "buffer_length" is how much is already used.
96
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
97
123
size_t buffer_capacity){
98
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
188
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
189
215
gpgme_strsource(rc), gpgme_strerror(rc));
190
216
plaintext_length = -1;
218
gpgme_decrypt_result_t result;
219
result = gpgme_op_decrypt_result(ctx);
221
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
223
fprintf(stderr, "Unsupported algorithm: %s\n",
224
result->unsupported_algorithm);
225
fprintf(stderr, "Wrong key usage: %u\n",
226
result->wrong_key_usage);
227
if(result->file_name != NULL){
228
fprintf(stderr, "File name: %s\n", result->file_name);
230
gpgme_recipient_t recipient;
231
recipient = result->recipients;
233
while(recipient != NULL){
234
fprintf(stderr, "Public key algorithm: %s\n",
235
gpgme_pubkey_algo_name(recipient->pubkey_algo));
236
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
237
fprintf(stderr, "Secret key available: %s\n",
238
recipient->status == GPG_ERR_NO_SECKEY
240
recipient = recipient->next;
191
245
goto decrypt_end;
195
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
199
gpgme_decrypt_result_t result;
200
result = gpgme_op_decrypt_result(ctx);
202
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
204
fprintf(stderr, "Unsupported algorithm: %s\n",
205
result->unsupported_algorithm);
206
fprintf(stderr, "Wrong key usage: %d\n",
207
result->wrong_key_usage);
208
if(result->file_name != NULL){
209
fprintf(stderr, "File name: %s\n", result->file_name);
211
gpgme_recipient_t recipient;
212
recipient = result->recipients;
214
while(recipient != NULL){
215
fprintf(stderr, "Public key algorithm: %s\n",
216
gpgme_pubkey_algo_name(recipient->pubkey_algo));
217
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
218
fprintf(stderr, "Secret key available: %s\n",
219
recipient->status == GPG_ERR_NO_SECKEY
221
recipient = recipient->next;
227
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
228
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
229
254
perror("pgpme_data_seek");
291
316
static int init_gnutls_global(mandos_context *mc,
292
const char *pubkeyfile,
293
const char *seckeyfile){
317
const char *pubkeyfilename,
318
const char *seckeyfilename){
297
322
fprintf(stderr, "Initializing GnuTLS\n");
300
if ((ret = gnutls_global_init ())
301
!= GNUTLS_E_SUCCESS) {
325
ret = gnutls_global_init();
326
if (ret != GNUTLS_E_SUCCESS) {
302
327
fprintf (stderr, "GnuTLS global_init: %s\n",
303
328
safer_gnutls_strerror(ret));
315
340
/* OpenPGP credentials */
316
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
317
!= GNUTLS_E_SUCCESS) {
318
fprintf (stderr, "GnuTLS memory error: %s\n",
341
gnutls_certificate_allocate_credentials(&mc->cred);
342
if (ret != GNUTLS_E_SUCCESS){
343
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
319
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
324
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
325
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
329
356
ret = gnutls_certificate_set_openpgp_key_file
330
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
(mc->cred, pubkeyfilename, seckeyfilename,
358
GNUTLS_OPENPGP_FMT_BASE64);
331
359
if (ret != GNUTLS_E_SUCCESS) {
333
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
334
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
335
363
fprintf(stdout, "The GnuTLS error is: %s\n",
336
364
safer_gnutls_strerror(ret));
340
368
/* GnuTLS server initialization */
342
370
if (ret != GNUTLS_E_SUCCESS) {
343
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
344
372
" %s\n", safer_gnutls_strerror(ret));
347
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
348
376
if (ret != GNUTLS_E_SUCCESS) {
349
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
350
378
safer_gnutls_strerror(ret));
354
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
388
gnutls_certificate_free_credentials(mc->cred);
389
gnutls_global_deinit();
359
394
static int init_gnutls_session(mandos_context *mc,
438
475
fprintf(stderr, "Binding to interface %s\n", interface);
441
memset(&to,0,sizeof(to)); /* Spurious warning */
478
memset(&to, 0, sizeof(to));
442
479
to.in6.sin6_family = AF_INET6;
443
480
/* It would be nice to have a way to detect if we were passed an
444
481
IPv4 address here. Now we assume an IPv6 address. */
451
488
fprintf(stderr, "Bad address: %s\n", ip);
454
to.in6.sin6_port = htons(port); /* Spurious warning */
491
to.in6.sin6_port = htons(port); /* Spurious warning */
456
493
to.in6.sin6_scope_id = (uint32_t)if_index;
459
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
496
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
460
498
char addrstr[INET6_ADDRSTRLEN] = "";
461
499
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
462
500
sizeof(addrstr)) == NULL){
639
681
char ip[AVAHI_ADDRESS_STR_MAX];
640
682
avahi_address_snprint(ip, sizeof(ip), address);
642
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
643
" port %d\n", name, host_name, ip, interface, port);
684
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
685
PRIu16 ") on port %d\n", name, host_name, ip,
645
688
int ret = start_mandos_communication(ip, port, interface, mc);
690
avahi_simple_poll_quit(mc->simple_poll);
705
748
/* Combines file name and path and returns the malloced new
706
749
string. some sane checks could/should be added */
707
static const char *combinepath(const char *first, const char *second){
708
size_t f_len = strlen(first);
709
size_t s_len = strlen(second);
710
char *tmp = malloc(f_len + s_len + 2);
750
static char *combinepath(const char *first, const char *second){
752
int ret = asprintf(&tmp, "%s/%s", first, second);
715
memcpy(tmp, first, f_len); /* Spurious warning */
719
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
721
tmp[f_len + 1 + s_len] = '\0';
736
770
char *connect_to = NULL;
737
771
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
738
const char *pubkeyfile = "pubkey.txt";
739
const char *seckeyfile = "seckey.txt";
772
char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
740
776
mandos_context mc = { .simple_poll = NULL, .server = NULL,
741
777
.dh_bits = 1024, .priority = "SECURE256"};
778
bool gnutls_initalized = false;
744
781
struct argp_option options[] = {
825
861
.doc = "Mandos client -- Get and decrypt"
826
862
" passwords from mandos server" };
827
argp_parse (&argp, argc, argv, 0, 0, NULL);
863
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
864
if (ret == ARGP_ERR_UNKNOWN){
865
fprintf(stderr, "Unknown error while parsing arguments\n");
866
exitcode = EXIT_FAILURE;
830
pubkeyfile = combinepath(keydir, pubkeyfile);
831
if (pubkeyfile == NULL){
871
pubkeyfilename = combinepath(keydir, pubkeyname);
872
if (pubkeyfilename == NULL){
832
873
perror("combinepath");
833
874
exitcode = EXIT_FAILURE;
837
seckeyfile = combinepath(keydir, seckeyfile);
838
if (seckeyfile == NULL){
878
seckeyfilename = combinepath(keydir, seckeyname);
879
if (seckeyfilename == NULL){
839
880
perror("combinepath");
881
exitcode = EXIT_FAILURE;
843
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
885
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
845
fprintf(stderr, "init_gnutls_global\n");
887
fprintf(stderr, "init_gnutls_global failed\n");
888
exitcode = EXIT_FAILURE;
891
gnutls_initalized = true;
894
/* If the interface is down, bring it up */
896
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
899
exitcode = EXIT_FAILURE;
902
strcpy(network.ifr_name, interface);
903
ret = ioctl(sd, SIOCGIFFLAGS, &network);
905
perror("ioctl SIOCGIFFLAGS");
906
exitcode = EXIT_FAILURE;
909
if((network.ifr_flags & IFF_UP) == 0){
910
network.ifr_flags |= IFF_UP;
911
ret = ioctl(sd, SIOCSIFFLAGS, &network);
913
perror("ioctl SIOCSIFFLAGS");
914
exitcode = EXIT_FAILURE;
852
924
ret = setuid(uid);
854
926
perror("setuid");
895
/* If the interface is down, bring it up */
897
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
900
exitcode = EXIT_FAILURE;
903
strcpy(network.ifr_name, interface); /* Spurious warning */
904
ret = ioctl(sd, SIOCGIFFLAGS, &network);
906
perror("ioctl SIOCGIFFLAGS");
907
exitcode = EXIT_FAILURE;
910
if((network.ifr_flags & IFF_UP) == 0){
911
network.ifr_flags |= IFF_UP;
912
ret = ioctl(sd, SIOCSIFFLAGS, &network);
914
perror("ioctl SIOCSIFFLAGS");
915
exitcode = EXIT_FAILURE;
923
968
avahi_set_log_function(empty_log);