32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
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() */
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
58
42
#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
76
45
#include <avahi-core/core.h>
77
46
#include <avahi-core/lookup.h>
78
47
#include <avahi-core/log.h>
80
49
#include <avahi-common/malloc.h>
81
50
#include <avahi-common/error.h>
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 */
93
#include <gpgme.h> /* All GPGME types, constants and
96
GPGME_PROTOCOL_OpenPGP,
53
#include <sys/types.h> /* socket(), inet_pton() */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton() */
56
#include <gnutls/gnutls.h> /* All GnuTLS stuff */
57
#include <gnutls/openpgp.h> /* GnuTLS with openpgp stuff */
59
#include <unistd.h> /* close() */
60
#include <netinet/in.h>
61
#include <stdbool.h> /* true */
62
#include <string.h> /* memset */
63
#include <arpa/inet.h> /* inet_pton() */
64
#include <iso646.h> /* not */
67
#include <errno.h> /* perror() */
99
73
#define BUFFER_SIZE 256
75
static const char *keydir = "/conf/conf.d/mandos";
76
static const char *pubkeyfile = "pubkey.txt";
77
static const char *seckeyfile = "seckey.txt";
101
79
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
103
static const char mandos_protocol_version[] = "1";
104
const char *argp_program_version = "password-request 1.0";
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
107
/* Used for passing in values through the Avahi callback functions */
81
/* Used for passing in values through all the callback functions */
109
83
AvahiSimplePoll *simple_poll;
110
84
AvahiServer *server;
111
85
gnutls_certificate_credentials_t cred;
112
86
unsigned int dh_bits;
113
gnutls_dh_params_t dh_params;
114
87
const char *priority;
118
* Make room in "buffer" for at least BUFFER_SIZE additional bytes.
119
* "buffer_capacity" is how much is currently allocated,
120
* "buffer_length" is how much is already used.
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
123
size_t buffer_capacity){
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
125
*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);
129
buffer_capacity += BUFFER_SIZE;
131
return buffer_capacity;
135
91
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
92
* Returns -1 on error
311
/* GnuTLS log function callback */
312
270
static void debuggnutls(__attribute__((unused)) int level,
313
271
const char* string){
314
fprintf(stderr, "GnuTLS: %s", string);
272
fprintf(stderr, "%s", string);
317
static int init_gnutls_global(mandos_context *mc,
318
const char *pubkeyfilename,
319
const char *seckeyfilename){
275
static int initgnutls(mandos_context *mc, gnutls_session_t *session,
276
gnutls_dh_params_t *dh_params){
323
281
fprintf(stderr, "Initializing GnuTLS\n");
326
ret = gnutls_global_init();
327
if (ret != GNUTLS_E_SUCCESS) {
328
fprintf (stderr, "GnuTLS global_init: %s\n",
329
safer_gnutls_strerror(ret));
284
if ((ret = gnutls_global_init ())
285
!= GNUTLS_E_SUCCESS) {
286
fprintf (stderr, "global_init: %s\n", safer_gnutls_strerror(ret));
334
/* "Use a log level over 10 to enable all debugging options."
337
291
gnutls_global_set_log_level(11);
338
292
gnutls_global_set_log_function(debuggnutls);
341
/* OpenPGP credentials */
342
gnutls_certificate_allocate_credentials(&mc->cred);
343
if (ret != GNUTLS_E_SUCCESS){
344
fprintf (stderr, "GnuTLS memory error: %s\n",
295
/* openpgp credentials */
296
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
297
!= GNUTLS_E_SUCCESS) {
298
fprintf (stderr, "memory error: %s\n",
345
299
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
351
304
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
305
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
356
309
ret = gnutls_certificate_set_openpgp_key_file
357
(mc->cred, pubkeyfilename, seckeyfilename,
358
GNUTLS_OPENPGP_FMT_BASE64);
310
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
359
311
if (ret != GNUTLS_E_SUCCESS) {
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stdout, "The GnuTLS error is: %s\n",
313
(stderr, "Error[%d] while reading the OpenPGP key pair ('%s',"
315
ret, pubkeyfile, seckeyfile);
316
fprintf(stdout, "The Error is: %s\n",
364
317
safer_gnutls_strerror(ret));
368
/* GnuTLS server initialization */
369
ret = gnutls_dh_params_init(&mc->dh_params);
370
if (ret != GNUTLS_E_SUCCESS) {
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
372
" %s\n", safer_gnutls_strerror(ret));
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
376
if (ret != GNUTLS_E_SUCCESS) {
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
378
safer_gnutls_strerror(ret));
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
388
gnutls_certificate_free_credentials(mc->cred);
389
gnutls_global_deinit();
394
static int init_gnutls_session(mandos_context *mc,
395
gnutls_session_t *session){
397
/* GnuTLS session creation */
398
ret = gnutls_init(session, GNUTLS_SERVER);
399
if (ret != GNUTLS_E_SUCCESS){
321
//GnuTLS server initialization
322
if ((ret = gnutls_dh_params_init(dh_params))
323
!= GNUTLS_E_SUCCESS) {
324
fprintf (stderr, "Error in dh parameter initialization: %s\n",
325
safer_gnutls_strerror(ret));
329
if ((ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits))
330
!= GNUTLS_E_SUCCESS) {
331
fprintf (stderr, "Error in prime generation: %s\n",
332
safer_gnutls_strerror(ret));
336
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
338
// GnuTLS session creation
339
if ((ret = gnutls_init(session, GNUTLS_SERVER))
340
!= GNUTLS_E_SUCCESS){
400
341
fprintf(stderr, "Error in GnuTLS session initialization: %s\n",
401
342
safer_gnutls_strerror(ret));
406
ret = gnutls_priority_set_direct(*session, mc->priority, &err);
407
if (ret != GNUTLS_E_SUCCESS) {
408
fprintf(stderr, "Syntax error at: %s\n", err);
409
fprintf(stderr, "GnuTLS error: %s\n",
410
safer_gnutls_strerror(ret));
411
gnutls_deinit (*session);
345
if ((ret = gnutls_priority_set_direct(*session, mc->priority, &err))
346
!= GNUTLS_E_SUCCESS) {
347
fprintf(stderr, "Syntax error at: %s\n", err);
348
fprintf(stderr, "GnuTLS error: %s\n",
349
safer_gnutls_strerror(ret));
416
ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
418
if (ret != GNUTLS_E_SUCCESS) {
419
fprintf(stderr, "Error setting GnuTLS credentials: %s\n",
353
if ((ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,
355
!= GNUTLS_E_SUCCESS) {
356
fprintf(stderr, "Error setting a credentials set: %s\n",
420
357
safer_gnutls_strerror(ret));
421
gnutls_deinit (*session);
509
ret = connect(tcp_sd, &to.in, sizeof(to));
436
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
511
438
perror("connect");
515
const char *out = mandos_protocol_version;
518
size_t out_size = strlen(out);
519
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
520
out_size - written));
526
written += (size_t)ret;
527
if(written < out_size){
530
if (out == mandos_protocol_version){
442
ret = initgnutls (mc, &session, &dh_params);
448
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
540
451
fprintf(stderr, "Establishing TLS session with %s\n", ip);
543
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
546
ret = gnutls_handshake (session);
547
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
454
ret = gnutls_handshake (session);
549
456
if (ret != GNUTLS_E_SUCCESS){
551
fprintf(stderr, "*** GnuTLS Handshake failed ***\n");
458
fprintf(stderr, "\n*** Handshake failed ***\n");
552
459
gnutls_perror (ret);
558
/* Read OpenPGP packet that contains the wanted password */
465
//Retrieve OpenPGP packet that contains the wanted password
561
468
fprintf(stderr, "Retrieving pgp encrypted password from %s\n",
713
618
case AVAHI_BROWSER_FAILURE:
715
fprintf(stderr, "(Avahi browser) %s\n",
620
fprintf(stderr, "(Browser) %s\n",
716
621
avahi_strerror(avahi_server_errno(mc->server)));
717
622
avahi_simple_poll_quit(mc->simple_poll);
720
625
case AVAHI_BROWSER_NEW:
721
/* We ignore the returned Avahi resolver object. In the callback
722
function we free it. If the Avahi server is terminated before
723
the callback function is called the Avahi server will free the
626
/* We ignore the returned resolver object. In the callback
627
function we free it. If the server is terminated before
628
the callback function is called the server will free
629
the resolver for us. */
726
631
if (!(avahi_s_service_resolver_new(mc->server, interface,
727
632
protocol, name, type, domain,
728
633
AVAHI_PROTO_INET6, 0,
729
634
resolve_callback, mc)))
730
fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",
731
name, avahi_strerror(avahi_server_errno(mc->server)));
635
fprintf(stderr, "Failed to resolve service '%s': %s\n", name,
636
avahi_strerror(avahi_server_errno(mc->server)));
734
639
case AVAHI_BROWSER_REMOVE:
737
642
case AVAHI_BROWSER_ALL_FOR_NOW:
738
643
case AVAHI_BROWSER_CACHE_EXHAUSTED:
740
fprintf(stderr, "No Mandos server found, still searching...\n");
746
648
/* Combines file name and path and returns the malloced new
747
649
string. some sane checks could/should be added */
748
static char *combinepath(const char *first, const char *second){
750
int ret = asprintf(&tmp, "%s/%s", first, second);
650
static const char *combinepath(const char *first, const char *second){
651
size_t f_len = strlen(first);
652
size_t s_len = strlen(second);
653
char *tmp = malloc(f_len + s_len + 2);
658
memcpy(tmp, first, f_len); /* Spurious warning */
662
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
664
tmp[f_len + 1 + s_len] = '\0';
758
int main(int argc, char *argv[]){
669
int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
670
AvahiServerConfig config;
759
671
AvahiSServiceBrowser *sb = NULL;
762
int exitcode = EXIT_SUCCESS;
675
int returncode = EXIT_SUCCESS;
763
676
const char *interface = "eth0";
764
677
struct ifreq network;
768
679
char *connect_to = NULL;
769
680
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
774
681
mandos_context mc = { .simple_poll = NULL, .server = NULL,
775
682
.dh_bits = 1024, .priority = "SECURE256"};
776
bool gnutls_initalized = false;
779
struct argp_option options[] = {
780
{ .name = "debug", .key = 128,
781
.doc = "Debug mode", .group = 3 },
782
{ .name = "connect", .key = 'c',
784
.doc = "Connect directly to a sepcified mandos server",
786
{ .name = "interface", .key = 'i',
788
.doc = "Interface that Avahi will conntect through",
790
{ .name = "keydir", .key = 'd',
792
.doc = "Directory where the openpgp keyring is",
794
{ .name = "seckey", .key = 's',
796
.doc = "Secret openpgp key for gnutls authentication",
798
{ .name = "pubkey", .key = 'p',
800
.doc = "Public openpgp key for gnutls authentication",
802
{ .name = "dh-bits", .key = 129,
804
.doc = "dh-bits to use in gnutls communication",
806
{ .name = "priority", .key = 130,
808
.doc = "GNUTLS priority", .group = 1 },
813
error_t parse_opt (int key, char *arg,
814
struct argp_state *state) {
815
/* Get the INPUT argument from `argp_parse', which we know is
816
a pointer to our plugin list pointer. */
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
852
return ARGP_ERR_UNKNOWN;
857
struct argp argp = { .options = options, .parser = parse_opt,
859
.doc = "Mandos client -- Get and decrypt"
860
" passwords from mandos server" };
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
862
if (ret == ARGP_ERR_UNKNOWN){
863
fprintf(stderr, "Unknown error while parsing arguments\n");
864
exitcode = EXIT_FAILURE;
869
pubkeyfilename = combinepath(keydir, pubkeyname);
870
if (pubkeyfilename == NULL){
871
perror("combinepath");
872
exitcode = EXIT_FAILURE;
876
seckeyfilename = combinepath(keydir, seckeyname);
877
if (seckeyfilename == NULL){
878
perror("combinepath");
879
exitcode = EXIT_FAILURE;
883
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
885
fprintf(stderr, "init_gnutls_global failed\n");
886
exitcode = EXIT_FAILURE;
889
gnutls_initalized = true;
892
/* If the interface is down, bring it up */
894
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
897
exitcode = EXIT_FAILURE;
900
strcpy(network.ifr_name, interface); /* Spurious warning */
901
ret = ioctl(sd, SIOCGIFFLAGS, &network);
903
perror("ioctl SIOCGIFFLAGS");
904
exitcode = EXIT_FAILURE;
907
if((network.ifr_flags & IFF_UP) == 0){
908
network.ifr_flags |= IFF_UP;
909
ret = ioctl(sd, SIOCSIFFLAGS, &network);
911
perror("ioctl SIOCSIFFLAGS");
912
exitcode = EXIT_FAILURE;
684
debug_int = debug ? 1 : 0;
686
struct option long_options[] = {
687
{"debug", no_argument, &debug_int, 1},
688
{"connect", required_argument, NULL, 'c'},
689
{"interface", required_argument, NULL, 'i'},
690
{"keydir", required_argument, NULL, 'd'},
691
{"seckey", required_argument, NULL, 's'},
692
{"pubkey", required_argument, NULL, 'p'},
693
{"dh-bits", required_argument, NULL, 'D'},
694
{"priority", required_argument, NULL, 'P'},
697
int option_index = 0;
698
ret = getopt_long (argc, argv, "i:", long_options,
725
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
732
mc.priority = optarg;
739
debug = debug_int ? true : false;
741
pubkeyfile = combinepath(keydir, pubkeyfile);
742
if (pubkeyfile == NULL){
743
perror("combinepath");
744
returncode = EXIT_FAILURE;
748
seckeyfile = combinepath(keydir, seckeyfile);
749
if (seckeyfile == NULL){
750
perror("combinepath");
932
754
if_index = (AvahiIfIndex) if_nametoindex(interface);
941
763
char *address = strrchr(connect_to, ':');
942
764
if(address == NULL){
943
765
fprintf(stderr, "No colon in address\n");
944
exitcode = EXIT_FAILURE;
948
769
uint16_t port = (uint16_t) strtol(address+1, NULL, 10);
950
771
perror("Bad port number");
951
exitcode = EXIT_FAILURE;
955
775
address = connect_to;
956
776
ret = start_mandos_communication(address, port, if_index, &mc);
958
exitcode = EXIT_FAILURE;
960
exitcode = EXIT_SUCCESS;
784
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
787
returncode = EXIT_FAILURE;
790
strcpy(network.ifr_name, interface); /* Spurious warning */
791
ret = ioctl(sd, SIOCGIFFLAGS, &network);
794
perror("ioctl SIOCGIFFLAGS");
795
returncode = EXIT_FAILURE;
798
if((network.ifr_flags & IFF_UP) == 0){
799
network.ifr_flags |= IFF_UP;
800
ret = ioctl(sd, SIOCSIFFLAGS, &network);
802
perror("ioctl SIOCSIFFLAGS");
803
returncode = EXIT_FAILURE;
966
810
avahi_set_log_function(empty_log);
969
/* Initialize the pseudo-RNG for Avahi */
813
/* Initialize the psuedo-RNG */
970
814
srand((unsigned int) time(NULL));
972
/* Allocate main Avahi loop object */
973
mc.simple_poll = avahi_simple_poll_new();
974
if (mc.simple_poll == NULL) {
975
fprintf(stderr, "Avahi: Failed to create simple poll"
977
exitcode = EXIT_FAILURE;
982
AvahiServerConfig config;
983
/* Do not publish any local Zeroconf records */
984
avahi_server_config_init(&config);
985
config.publish_hinfo = 0;
986
config.publish_addresses = 0;
987
config.publish_workstation = 0;
988
config.publish_domain = 0;
990
/* Allocate a new server */
991
mc.server = avahi_server_new(avahi_simple_poll_get
992
(mc.simple_poll), &config, NULL,
995
/* Free the Avahi configuration data */
996
avahi_server_config_free(&config);
999
/* Check if creating the Avahi server object succeeded */
1000
if (mc.server == NULL) {
1001
fprintf(stderr, "Failed to create Avahi server: %s\n",
816
/* Allocate main loop object */
817
if (!(mc.simple_poll = avahi_simple_poll_new())) {
818
fprintf(stderr, "Failed to create simple poll object.\n");
819
returncode = EXIT_FAILURE;
823
/* Do not publish any local records */
824
avahi_server_config_init(&config);
825
config.publish_hinfo = 0;
826
config.publish_addresses = 0;
827
config.publish_workstation = 0;
828
config.publish_domain = 0;
830
/* Allocate a new server */
831
mc.server=avahi_server_new(avahi_simple_poll_get(mc.simple_poll),
832
&config, NULL, NULL, &error);
834
/* Free the configuration data */
835
avahi_server_config_free(&config);
837
/* Check if creating the server object succeeded */
839
fprintf(stderr, "Failed to create server: %s\n",
1002
840
avahi_strerror(error));
1003
exitcode = EXIT_FAILURE;
841
returncode = EXIT_FAILURE;
1007
/* Create the Avahi service browser */
845
/* Create the service browser */
1008
846
sb = avahi_s_service_browser_new(mc.server, if_index,
1009
847
AVAHI_PROTO_INET6,
1010
848
"_mandos._tcp", NULL, 0,
1011
849
browse_callback, &mc);
1013
851
fprintf(stderr, "Failed to create service browser: %s\n",
1014
852
avahi_strerror(avahi_server_errno(mc.server)));
1015
exitcode = EXIT_FAILURE;
853
returncode = EXIT_FAILURE;
1019
857
/* Run the main loop */
1022
fprintf(stderr, "Starting Avahi loop search\n");
860
fprintf(stderr, "Starting avahi loop search\n");
1025
863
avahi_simple_poll_loop(mc.simple_poll);
1030
868
fprintf(stderr, "%s exiting\n", argv[0]);
1033
871
/* Cleanup things */
1035
873
avahi_s_service_browser_free(sb);
1037
if (mc.server != NULL)
1038
876
avahi_server_free(mc.server);
1040
if (mc.simple_poll != NULL)
1041
879
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1045
if (gnutls_initalized){
1046
gnutls_certificate_free_credentials(mc.cred);
1047
gnutls_global_deinit ();