32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
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(), memcpy(), strcpy() */
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
50
sockaddr_in6, PF_INET6,
51
SOCK_STREAM, INET6_ADDRSTRLEN,
53
#include <inttypes.h> /* PRIu16 */
54
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
55
struct in6_addr, inet_pton(),
57
#include <assert.h> /* assert() */
58
#include <errno.h> /* perror(), errno */
59
#include <time.h> /* time() */
39
#include <net/if.h> /* if_nametoindex */
40
#include <sys/ioctl.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
60
42
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
61
SIOCSIFFLAGS, if_indextoname(),
62
if_nametoindex(), IF_NAMESIZE */
63
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
64
getuid(), getgid(), setuid(),
66
#include <netinet/in.h>
67
#include <arpa/inet.h> /* inet_pton(), htons */
68
#include <iso646.h> /* not, and */
69
#include <argp.h> /* struct argp_option, error_t, struct
70
argp_state, struct argp,
71
argp_parse(), ARGP_KEY_ARG,
72
ARGP_KEY_END, ARGP_ERR_UNKNOWN */
75
/* All Avahi types, constants and functions
78
45
#include <avahi-core/core.h>
79
46
#include <avahi-core/lookup.h>
80
47
#include <avahi-core/log.h>
82
49
#include <avahi-common/malloc.h>
83
50
#include <avahi-common/error.h>
86
#include <gnutls/gnutls.h> /* All GnuTLS types, constants and functions
88
init_gnutls_session(),
90
#include <gnutls/openpgp.h> /* gnutls_certificate_set_openpgp_key_file(),
91
GNUTLS_OPENPGP_FMT_BASE64 */
52
/* Mandos client part */
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 */
65
#include <net/if.h> /* IF_NAMESIZE */
94
#include <gpgme.h> /* All GPGME types, constants and functions
96
GPGME_PROTOCOL_OpenPGP,
68
#include <errno.h> /* perror() */
99
74
#define BUFFER_SIZE 256
76
static const char *keydir = "/conf/conf.d/mandos";
77
static const char *pubkeyfile = "pubkey.txt";
78
static const char *seckeyfile = "seckey.txt";
101
80
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 */
82
/* Used for passing in values through all the callback functions */
109
84
AvahiSimplePoll *simple_poll;
110
85
AvahiServer *server;
111
86
gnutls_certificate_credentials_t cred;
112
87
unsigned int dh_bits;
113
gnutls_dh_params_t dh_params;
114
88
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
92
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
93
* Returns -1 on error
361
319
" '%s')\n", ret, pubkeyfile, seckeyfile);
362
320
fprintf(stdout, "The GnuTLS error is: %s\n",
363
321
safer_gnutls_strerror(ret));
367
325
/* GnuTLS server initialization */
368
ret = gnutls_dh_params_init(&mc->dh_params);
326
ret = gnutls_dh_params_init(dh_params);
369
327
if (ret != GNUTLS_E_SUCCESS) {
370
328
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
371
329
" %s\n", safer_gnutls_strerror(ret));
374
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
332
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
375
333
if (ret != GNUTLS_E_SUCCESS) {
376
334
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
377
335
safer_gnutls_strerror(ret));
381
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
387
gnutls_certificate_free_credentials(mc->cred);
388
gnutls_global_deinit();
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
339
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
396
341
/* GnuTLS session creation */
397
342
ret = gnutls_init(session, GNUTLS_SERVER);
398
343
if (ret != GNUTLS_E_SUCCESS){
439
382
AvahiIfIndex if_index,
440
383
mandos_context *mc){
442
union { struct sockaddr in; struct sockaddr_in6 in6; } to;
385
struct sockaddr_in6 to;
443
386
char *buffer = NULL;
444
387
char *decrypted_buffer;
445
388
size_t buffer_length = 0;
446
389
size_t buffer_capacity = 0;
447
390
ssize_t decrypted_buffer_size;
450
393
char interface[IF_NAMESIZE];
451
394
gnutls_session_t session;
395
gnutls_dh_params_t dh_params;
453
ret = init_gnutls_session (mc, &session);
397
ret = initgnutls (mc, &session, &dh_params);
459
fprintf(stderr, "Setting up a tcp connection to %s, port %" PRIu16
403
fprintf(stderr, "Setting up a tcp connection to %s, port %d\n",
463
407
tcp_sd = socket(PF_INET6, SOCK_STREAM, 0);
487
431
fprintf(stderr, "Bad address: %s\n", ip);
490
to.in6.sin6_port = htons(port); /* Spurious warning */
434
to.sin6_port = htons(port); /* Spurious warning */
492
to.in6.sin6_scope_id = (uint32_t)if_index;
436
to.sin6_scope_id = (uint32_t)if_index;
495
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
439
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
497
440
char addrstr[INET6_ADDRSTRLEN] = "";
498
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
441
if(inet_ntop(to.sin6_family, &(to.sin6_addr), addrstr,
499
442
sizeof(addrstr)) == NULL){
500
443
perror("inet_ntop");
508
ret = connect(tcp_sd, &to.in, sizeof(to));
451
ret = connect(tcp_sd, (struct sockaddr *) &to, sizeof(to));
510
453
perror("connect");
514
const char *out = mandos_protocol_version;
517
size_t out_size = strlen(out);
518
ret = TEMP_FAILURE_RETRY(write(tcp_sd, out + written,
519
out_size - written));
525
written += (size_t)ret;
526
if(written < out_size){
529
if (out == mandos_protocol_version){
539
458
fprintf(stderr, "Establishing TLS session with %s\n", ip);
542
461
gnutls_transport_set_ptr (session, (gnutls_transport_ptr_t) tcp_sd);
545
ret = gnutls_handshake (session);
546
} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);
463
ret = gnutls_handshake (session);
548
465
if (ret != GNUTLS_E_SUCCESS){
678
596
char ip[AVAHI_ADDRESS_STR_MAX];
679
597
avahi_address_snprint(ip, sizeof(ip), address);
681
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
682
PRIu16 ") on port %d\n", name, host_name, ip,
599
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
600
" port %d\n", name, host_name, ip, interface, port);
685
602
int ret = start_mandos_communication(ip, port, interface, mc);
771
688
const char *interface = "eth0";
772
689
struct ifreq network;
776
691
char *connect_to = NULL;
777
692
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
778
const char *pubkeyfile = "pubkey.txt";
779
const char *seckeyfile = "seckey.txt";
780
693
mandos_context mc = { .simple_poll = NULL, .server = NULL,
781
694
.dh_bits = 1024, .priority = "SECURE256"};
782
bool gnutls_initalized = false;
785
struct argp_option options[] = {
786
{ .name = "debug", .key = 128,
787
.doc = "Debug mode", .group = 3 },
788
{ .name = "connect", .key = 'c',
790
.doc = "Connect directly to a sepcified mandos server",
792
{ .name = "interface", .key = 'i',
794
.doc = "Interface that Avahi will conntect through",
796
{ .name = "keydir", .key = 'd',
798
.doc = "Directory where the openpgp keyring is",
800
{ .name = "seckey", .key = 's',
802
.doc = "Secret openpgp key for gnutls authentication",
804
{ .name = "pubkey", .key = 'p',
806
.doc = "Public openpgp key for gnutls authentication",
808
{ .name = "dh-bits", .key = 129,
810
.doc = "dh-bits to use in gnutls communication",
812
{ .name = "priority", .key = 130,
814
.doc = "GNUTLS priority", .group = 1 },
819
error_t parse_opt (int key, char *arg,
820
struct argp_state *state) {
821
/* Get the INPUT argument from `argp_parse', which we know is
822
a pointer to our plugin list pointer. */
697
/* Temporary int to get the address of for getopt_long */
698
int debug_int = debug ? 1 : 0;
700
struct option long_options[] = {
701
{"debug", no_argument, &debug_int, 1},
702
{"connect", required_argument, NULL, 'c'},
703
{"interface", required_argument, NULL, 'i'},
704
{"keydir", required_argument, NULL, 'd'},
705
{"seckey", required_argument, NULL, 's'},
706
{"pubkey", required_argument, NULL, 'p'},
707
{"dh-bits", required_argument, NULL, 'D'},
708
{"priority", required_argument, NULL, 'P'},
711
int option_index = 0;
712
ret = getopt_long (argc, argv, "i:", long_options,
844
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
739
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
846
741
perror("strtol");
847
742
exit(EXIT_FAILURE);
746
mc.priority = optarg;
859
return ARGP_ERR_UNKNOWN;
750
/* getopt_long() has already printed a message about the
751
unrcognized option, so just exit. */
864
struct argp argp = { .options = options, .parser = parse_opt,
866
.doc = "Mandos client -- Get and decrypt"
867
" passwords from mandos server" };
868
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
869
if (ret == ARGP_ERR_UNKNOWN){
870
fprintf(stderr, "Unkown error while parsing arguments\n");
871
exitcode = EXIT_FAILURE;
755
/* Set the global debug flag from the temporary int */
756
debug = debug_int ? true : false;
876
759
pubkeyfile = combinepath(keydir, pubkeyfile);
877
760
if (pubkeyfile == NULL){
878
761
perror("combinepath");