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 */
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 */
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 */
70
#include <errno.h> /* perror() */
93
#include <gpgme.h> /* All GPGME types, constants and
96
GPGME_PROTOCOL_OpenPGP,
76
99
#define BUFFER_SIZE 256
78
102
static const char *keydir = "/conf/conf.d/mandos";
79
static const char *pubkeyfile = "pubkey.txt";
80
static const char *seckeyfile = "seckey.txt";
84
const char mandos_protocol_version[] = "1";
86
/* Used for passing in values through all the callback functions */
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 */
88
109
AvahiSimplePoll *simple_poll;
89
110
AvahiServer *server;
90
111
gnutls_certificate_credentials_t cred;
91
112
unsigned int dh_bits;
113
gnutls_dh_params_t dh_params;
92
114
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.
95
122
size_t adjustbuffer(char **buffer, size_t buffer_length,
96
123
size_t buffer_capacity){
97
124
if (buffer_length + BUFFER_SIZE > buffer_capacity){
187
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
188
215
gpgme_strsource(rc), gpgme_strerror(rc));
189
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;
190
245
goto decrypt_end;
194
249
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
198
gpgme_decrypt_result_t result;
199
result = gpgme_op_decrypt_result(ctx);
201
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
203
fprintf(stderr, "Unsupported algorithm: %s\n",
204
result->unsupported_algorithm);
205
fprintf(stderr, "Wrong key usage: %d\n",
206
result->wrong_key_usage);
207
if(result->file_name != NULL){
208
fprintf(stderr, "File name: %s\n", result->file_name);
210
gpgme_recipient_t recipient;
211
recipient = result->recipients;
213
while(recipient != NULL){
214
fprintf(stderr, "Public key algorithm: %s\n",
215
gpgme_pubkey_algo_name(recipient->pubkey_algo));
216
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
217
fprintf(stderr, "Secret key available: %s\n",
218
recipient->status == GPG_ERR_NO_SECKEY
220
recipient = recipient->next;
226
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
227
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
228
254
perror("pgpme_data_seek");
312
340
/* OpenPGP credentials */
313
if ((ret = gnutls_certificate_allocate_credentials (&mc->cred))
314
!= GNUTLS_E_SUCCESS) {
315
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
316
345
safer_gnutls_strerror(ret));
346
gnutls_global_deinit ();
321
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
322
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
351
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
352
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
326
356
ret = gnutls_certificate_set_openpgp_key_file
327
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
357
(mc->cred, pubkeyfilename, seckeyfilename,
358
GNUTLS_OPENPGP_FMT_BASE64);
328
359
if (ret != GNUTLS_E_SUCCESS) {
330
361
"Error[%d] while reading the OpenPGP key pair ('%s',"
331
" '%s')\n", ret, pubkeyfile, seckeyfile);
332
fprintf(stdout, "The GnuTLS error is: %s\n",
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
363
fprintf(stderr, "The GnuTLS error is: %s\n",
333
364
safer_gnutls_strerror(ret));
337
368
/* GnuTLS server initialization */
338
ret = gnutls_dh_params_init(dh_params);
369
ret = gnutls_dh_params_init(&mc->dh_params);
339
370
if (ret != GNUTLS_E_SUCCESS) {
340
371
fprintf (stderr, "Error in GnuTLS DH parameter initialization:"
341
372
" %s\n", safer_gnutls_strerror(ret));
344
ret = gnutls_dh_params_generate2(*dh_params, mc->dh_bits);
375
ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);
345
376
if (ret != GNUTLS_E_SUCCESS) {
346
377
fprintf (stderr, "Error in GnuTLS prime generation: %s\n",
347
378
safer_gnutls_strerror(ret));
351
gnutls_certificate_set_dh_params(mc->cred, *dh_params);
382
gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);
388
gnutls_certificate_free_credentials(mc->cred);
389
gnutls_global_deinit();
393
static int init_gnutls_session(mandos_context *mc,
394
gnutls_session_t *session){
353
396
/* GnuTLS session creation */
354
397
ret = gnutls_init(session, GNUTLS_SERVER);
355
398
if (ret != GNUTLS_E_SUCCESS){
722
764
const char *interface = "eth0";
723
765
struct ifreq network;
725
769
char *connect_to = NULL;
726
770
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
771
char *pubkeyfilename = NULL;
772
char *seckeyfilename = NULL;
773
const char *pubkeyname = "pubkey.txt";
774
const char *seckeyname = "seckey.txt";
727
775
mandos_context mc = { .simple_poll = NULL, .server = NULL,
728
.dh_bits = 1024, .priority = "SECURE256"};
776
.dh_bits = 1024, .priority = "SECURE256"
777
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
bool gnutls_initalized = false;
731
/* Temporary int to get the address of for getopt_long */
732
int debug_int = debug ? 1 : 0;
734
struct option long_options[] = {
735
{"debug", no_argument, &debug_int, 1},
736
{"connect", required_argument, NULL, 'c'},
737
{"interface", required_argument, NULL, 'i'},
738
{"keydir", required_argument, NULL, 'd'},
739
{"seckey", required_argument, NULL, 's'},
740
{"pubkey", required_argument, NULL, 'p'},
741
{"dh-bits", required_argument, NULL, 'D'},
742
{"priority", required_argument, NULL, 'P'},
745
int option_index = 0;
746
ret = getopt_long (argc, argv, "i:", long_options,
781
struct argp_option options[] = {
782
{ .name = "debug", .key = 128,
783
.doc = "Debug mode", .group = 3 },
784
{ .name = "connect", .key = 'c',
785
.arg = "ADDRESS:PORT",
786
.doc = "Connect directly to a specific Mandos server",
788
{ .name = "interface", .key = 'i',
790
.doc = "Interface that will be used to search for Mandos"
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory to read the OpenPGP key files from",
797
{ .name = "seckey", .key = 's',
799
.doc = "OpenPGP secret key file base name",
801
{ .name = "pubkey", .key = 'p',
803
.doc = "OpenPGP public key file base name",
805
{ .name = "dh-bits", .key = 129,
807
.doc = "Bit length of the prime number used in the"
808
" Diffie-Hellman key exchange",
810
{ .name = "priority", .key = 130,
812
.doc = "GnuTLS priority string for the TLS handshake",
817
error_t parse_opt (int key, char *arg,
818
struct argp_state *state) {
819
/* Get the INPUT argument from `argp_parse', which we know is
820
a pointer to our plugin list pointer. */
822
case 128: /* --debug */
825
case 'c': /* --connect */
828
case 'i': /* --interface */
831
case 'd': /* --keydir */
834
case 's': /* --seckey */
837
case 'p': /* --pubkey */
840
case 129: /* --dh-bits */
773
mc.dh_bits = (unsigned int) strtol(optarg, NULL, 10);
842
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
775
844
perror("strtol");
776
845
exit(EXIT_FAILURE);
780
mc.priority = optarg;
848
case 130: /* --priority */
784
/* getopt_long() has already printed a message about the
785
unrcognized option, so just exit. */
789
/* Set the global debug flag from the temporary int */
790
debug = debug_int ? true : false;
793
pubkeyfile = combinepath(keydir, pubkeyfile);
794
if (pubkeyfile == NULL){
795
perror("combinepath");
796
exitcode = EXIT_FAILURE;
800
seckeyfile = combinepath(keydir, seckeyfile);
801
if (seckeyfile == NULL){
802
perror("combinepath");
856
return ARGP_ERR_UNKNOWN;
861
struct argp argp = { .options = options, .parser = parse_opt,
863
.doc = "Mandos client -- Get and decrypt"
864
" passwords from a Mandos server" };
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
866
if (ret == ARGP_ERR_UNKNOWN){
867
fprintf(stderr, "Unknown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
873
pubkeyfilename = combinepath(keydir, pubkeyname);
874
if (pubkeyfilename == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfilename = combinepath(keydir, seckeyname);
881
if (seckeyfilename == NULL){
882
perror("combinepath");
883
exitcode = EXIT_FAILURE;
887
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
889
fprintf(stderr, "init_gnutls_global failed\n");
890
exitcode = EXIT_FAILURE;
893
gnutls_initalized = true;
896
/* If the interface is down, bring it up */
898
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
901
exitcode = EXIT_FAILURE;
904
strcpy(network.ifr_name, interface);
905
ret = ioctl(sd, SIOCGIFFLAGS, &network);
907
perror("ioctl SIOCGIFFLAGS");
908
exitcode = EXIT_FAILURE;
911
if((network.ifr_flags & IFF_UP) == 0){
912
network.ifr_flags |= IFF_UP;
913
ret = ioctl(sd, SIOCSIFFLAGS, &network);
915
perror("ioctl SIOCSIFFLAGS");
916
exitcode = EXIT_FAILURE;
806
936
if_index = (AvahiIfIndex) if_nametoindex(interface);