32
32
#define _LARGEFILE_SOURCE
33
33
#define _FILE_OFFSET_BITS 64
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */
35
#define _GNU_SOURCE /* TEMP_FAILURE_RETRY() */
37
#include <stdio.h> /* fprintf(), stderr, fwrite(),
37
#include <stdio.h> /* fprintf(), stderr, fwrite(), stdout,
39
39
#include <stdint.h> /* uint16_t, uint32_t */
40
40
#include <stddef.h> /* NULL, size_t, ssize_t */
41
41
#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,
43
43
#include <stdbool.h> /* bool, true */
44
44
#include <string.h> /* memset(), strcmp(), strlen(),
45
strerror(), asprintf(), strcpy() */
45
strerror(), memcpy(), strcpy() */
46
46
#include <sys/ioctl.h> /* ioctl */
47
#include <net/if.h> /* ifreq, SIOCGIFFLAGS, SIOCSIFFLAGS,
47
49
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
48
50
sockaddr_in6, PF_INET6,
49
51
SOCK_STREAM, INET6_ADDRSTRLEN,
50
uid_t, gid_t, open(), opendir(), DIR */
51
#include <sys/stat.h> /* open() */
52
53
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
53
54
struct in6_addr, inet_pton(),
55
#include <fcntl.h> /* open() */
56
#include <dirent.h> /* opendir(), struct dirent, readdir() */
57
#include <inttypes.h> /* PRIu16 */
58
56
#include <assert.h> /* assert() */
59
57
#include <errno.h> /* perror(), errno */
60
58
#include <time.h> /* time() */
61
59
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
62
60
SIOCSIFFLAGS, if_indextoname(),
63
61
if_nametoindex(), IF_NAMESIZE */
64
#include <netinet/in.h>
65
62
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
66
63
getuid(), getgid(), setuid(),
65
#include <netinet/in.h>
68
66
#include <arpa/inet.h> /* inet_pton(), htons */
69
67
#include <iso646.h> /* not, and */
70
68
#include <argp.h> /* struct argp_option, error_t, struct
93
90
GNUTLS_OPENPGP_FMT_BASE64 */
96
#include <gpgme.h> /* All GPGME types, constants and
93
#include <gpgme.h> /* All GPGME types, constants and functions
99
95
GPGME_PROTOCOL_OpenPGP,
102
98
#define BUFFER_SIZE 256
105
#define PATHDIR "/conf/conf.d/mandos"
108
#define PATHDIR "/conf/conf.d/mandos"
109
#define SECKEY "seckey.txt"
110
#define PUBKEY "pubkey.txt"
112
100
bool debug = false;
101
static const char *keydir = "/conf/conf.d/mandos";
113
102
static const char mandos_protocol_version[] = "1";
114
const char *argp_program_version = "mandos-client 1.0";
103
const char *argp_program_version = "password-request 1.0";
115
104
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
117
106
/* Used for passing in values through the Avahi callback functions */
134
* Decrypt OpenPGP data using keyrings in HOMEDIR.
135
* Returns -1 on error
148
static bool init_gpgme(mandos_context *mc, const char *seckey,
149
const char *pubkey, const char *tempdir){
137
static ssize_t pgp_packet_decrypt (const char *cryptotext,
140
const char *homedir){
141
gpgme_data_t dh_crypto, dh_plain;
151
143
gpgme_error_t rc;
145
size_t plaintext_capacity = 0;
146
ssize_t plaintext_length = 0;
152
147
gpgme_engine_info_t engine_info;
156
* Helper function to insert pub and seckey to the enigne keyring.
158
bool import_key(const char *filename){
160
gpgme_data_t pgp_data;
162
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
168
rc = gpgme_data_new_from_fd(&pgp_data, fd);
169
if (rc != GPG_ERR_NO_ERROR){
170
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
171
gpgme_strsource(rc), gpgme_strerror(rc));
175
rc = gpgme_op_import(mc->ctx, pgp_data);
176
if (rc != GPG_ERR_NO_ERROR){
177
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
178
gpgme_strsource(rc), gpgme_strerror(rc));
182
ret = TEMP_FAILURE_RETRY(close(fd));
186
gpgme_data_release(pgp_data);
191
fprintf(stderr, "Initialize gpgme\n");
150
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
197
156
if (rc != GPG_ERR_NO_ERROR){
198
157
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
199
158
gpgme_strsource(rc), gpgme_strerror(rc));
203
/* Set GPGME home directory for the OpenPGP engine only */
162
/* Set GPGME home directory for the OpenPGP engine only */
204
163
rc = gpgme_get_engine_info (&engine_info);
205
164
if (rc != GPG_ERR_NO_ERROR){
206
165
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
207
166
gpgme_strsource(rc), gpgme_strerror(rc));
210
169
while(engine_info != NULL){
211
170
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
212
171
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
213
engine_info->file_name, tempdir);
172
engine_info->file_name, homedir);
216
175
engine_info = engine_info->next;
218
177
if(engine_info == NULL){
219
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
223
/* Create new GPGME "context" */
224
rc = gpgme_new(&(mc->ctx));
225
if (rc != GPG_ERR_NO_ERROR){
226
fprintf(stderr, "bad gpgme_new: %s: %s\n",
227
gpgme_strsource(rc), gpgme_strerror(rc));
231
if (not import_key(pubkey) or not import_key(seckey)){
239
* Decrypt OpenPGP data.
240
* Returns -1 on error
242
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
243
const char *cryptotext,
246
gpgme_data_t dh_crypto, dh_plain;
249
size_t plaintext_capacity = 0;
250
ssize_t plaintext_length = 0;
253
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
178
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
256
182
/* Create new GPGME data buffer from memory cryptotext */
200
/* Create new GPGME "context" */
201
rc = gpgme_new(&ctx);
202
if (rc != GPG_ERR_NO_ERROR){
203
fprintf(stderr, "bad gpgme_new: %s: %s\n",
204
gpgme_strsource(rc), gpgme_strerror(rc));
205
plaintext_length = -1;
274
209
/* Decrypt data from the cryptotext data buffer to the plaintext
276
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
211
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
277
212
if (rc != GPG_ERR_NO_ERROR){
278
213
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
279
214
gpgme_strsource(rc), gpgme_strerror(rc));
280
215
plaintext_length = -1;
282
gpgme_decrypt_result_t result;
283
result = gpgme_op_decrypt_result(mc->ctx);
285
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
287
fprintf(stderr, "Unsupported algorithm: %s\n",
288
result->unsupported_algorithm);
289
fprintf(stderr, "Wrong key usage: %u\n",
290
result->wrong_key_usage);
291
if(result->file_name != NULL){
292
fprintf(stderr, "File name: %s\n", result->file_name);
294
gpgme_recipient_t recipient;
295
recipient = result->recipients;
297
while(recipient != NULL){
298
fprintf(stderr, "Public key algorithm: %s\n",
299
gpgme_pubkey_algo_name(recipient->pubkey_algo));
300
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
301
fprintf(stderr, "Secret key available: %s\n",
302
recipient->status == GPG_ERR_NO_SECKEY
304
recipient = recipient->next;
309
216
goto decrypt_end;
313
220
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
224
gpgme_decrypt_result_t result;
225
result = gpgme_op_decrypt_result(ctx);
227
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
229
fprintf(stderr, "Unsupported algorithm: %s\n",
230
result->unsupported_algorithm);
231
fprintf(stderr, "Wrong key usage: %d\n",
232
result->wrong_key_usage);
233
if(result->file_name != NULL){
234
fprintf(stderr, "File name: %s\n", result->file_name);
236
gpgme_recipient_t recipient;
237
recipient = result->recipients;
239
while(recipient != NULL){
240
fprintf(stderr, "Public key algorithm: %s\n",
241
gpgme_pubkey_algo_name(recipient->pubkey_algo));
242
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
243
fprintf(stderr, "Secret key available: %s\n",
244
recipient->status == GPG_ERR_NO_SECKEY
246
recipient = recipient->next;
316
252
/* Seek back to the beginning of the GPGME plaintext data buffer */
317
253
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
318
perror("gpgme_data_seek");
254
perror("pgpme_data_seek");
319
255
plaintext_length = -1;
320
256
goto decrypt_end;
404
340
/* OpenPGP credentials */
405
341
gnutls_certificate_allocate_credentials(&mc->cred);
406
342
if (ret != GNUTLS_E_SUCCESS){
407
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
343
fprintf (stderr, "GnuTLS memory error: %s\n",
409
344
safer_gnutls_strerror(ret));
410
345
gnutls_global_deinit ();
415
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
416
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
350
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
351
" and keyfile %s as GnuTLS credentials\n", pubkeyfile,
420
355
ret = gnutls_certificate_set_openpgp_key_file
421
(mc->cred, pubkeyfilename, seckeyfilename,
422
GNUTLS_OPENPGP_FMT_BASE64);
356
(mc->cred, pubkeyfile, seckeyfile, GNUTLS_OPENPGP_FMT_BASE64);
423
357
if (ret != GNUTLS_E_SUCCESS) {
425
359
"Error[%d] while reading the OpenPGP key pair ('%s',"
426
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
427
fprintf(stderr, "The GnuTLS error is: %s\n",
360
" '%s')\n", ret, pubkeyfile, seckeyfile);
361
fprintf(stdout, "The GnuTLS error is: %s\n",
428
362
safer_gnutls_strerror(ret));
552
486
fprintf(stderr, "Bad address: %s\n", ip);
555
to.in6.sin6_port = htons(port); /* Spurious warning */
489
to.in6.sin6_port = htons(port); /* Spurious warning */
557
491
to.in6.sin6_scope_id = (uint32_t)if_index;
560
fprintf(stderr, "Connection to: %s, port %" PRIu16 "\n", ip,
494
fprintf(stderr, "Connection to: %s, port %d\n", ip, port);
562
495
char addrstr[INET6_ADDRSTRLEN] = "";
563
496
if(inet_ntop(to.in6.sin6_family, &(to.in6.sin6_addr), addrstr,
564
497
sizeof(addrstr)) == NULL){
747
676
char ip[AVAHI_ADDRESS_STR_MAX];
748
677
avahi_address_snprint(ip, sizeof(ip), address);
750
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"
751
PRIu16 ") on port %d\n", name, host_name, ip,
679
fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %d) on"
680
" port %d\n", name, host_name, ip, interface, port);
754
682
int ret = start_mandos_communication(ip, port, interface, mc);
756
avahi_simple_poll_quit(mc->simple_poll);
742
/* Combines file name and path and returns the malloced new
743
string. some sane checks could/should be added */
744
static const char *combinepath(const char *first, const char *second){
745
size_t f_len = strlen(first);
746
size_t s_len = strlen(second);
747
char *tmp = malloc(f_len + s_len + 2);
752
memcpy(tmp, first, f_len); /* Spurious warning */
756
memcpy(tmp + f_len + 1, second, s_len); /* Spurious warning */
758
tmp[f_len + 1 + s_len] = '\0';
814
763
int main(int argc, char *argv[]){
815
764
AvahiSServiceBrowser *sb = NULL;
824
773
char *connect_to = NULL;
825
char tempdir[] = "/tmp/mandosXXXXXX";
826
774
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
827
const char *seckey = PATHDIR "/" SECKEY;
828
const char *pubkey = PATHDIR "/" PUBKEY;
775
const char *pubkeyfile = "pubkey.txt";
776
const char *seckeyfile = "seckey.txt";
830
777
mandos_context mc = { .simple_poll = NULL, .server = NULL,
831
.dh_bits = 1024, .priority = "SECURE256"
832
":!CTYPE-X.509:+CTYPE-OPENPGP" };
778
.dh_bits = 1024, .priority = "SECURE256"};
833
779
bool gnutls_initalized = false;
834
bool gpgme_initalized = false;
837
782
struct argp_option options[] = {
838
783
{ .name = "debug", .key = 128,
839
784
.doc = "Debug mode", .group = 3 },
840
785
{ .name = "connect", .key = 'c',
841
.arg = "ADDRESS:PORT",
842
.doc = "Connect directly to a specific Mandos server",
787
.doc = "Connect directly to a sepcified mandos server",
844
789
{ .name = "interface", .key = 'i',
846
.doc = "Interface that will be used to search for Mandos"
791
.doc = "Interface that Avahi will conntect through",
793
{ .name = "keydir", .key = 'd',
795
.doc = "Directory where the openpgp keyring is",
849
797
{ .name = "seckey", .key = 's',
851
.doc = "OpenPGP secret key file base name",
799
.doc = "Secret openpgp key for gnutls authentication",
853
801
{ .name = "pubkey", .key = 'p',
855
.doc = "OpenPGP public key file base name",
803
.doc = "Public openpgp key for gnutls authentication",
857
805
{ .name = "dh-bits", .key = 129,
859
.doc = "Bit length of the prime number used in the"
860
" Diffie-Hellman key exchange",
807
.doc = "dh-bits to use in gnutls communication",
862
809
{ .name = "priority", .key = 130,
864
.doc = "GnuTLS priority string for the TLS handshake",
811
.doc = "GNUTLS priority", .group = 1 },
869
816
error_t parse_opt (int key, char *arg,
870
817
struct argp_state *state) {
871
818
/* Get the INPUT argument from `argp_parse', which we know is
872
819
a pointer to our plugin list pointer. */
874
case 128: /* --debug */
877
case 'c': /* --connect */
878
825
connect_to = arg;
880
case 'i': /* --interface */
883
case 's': /* --seckey */
886
case 'p': /* --pubkey */
889
case 129: /* --dh-bits */
891
841
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
894
844
exit(EXIT_FAILURE);
897
case 130: /* --priority */
898
848
mc.priority = arg;
900
850
case ARGP_KEY_ARG:
901
851
argp_usage (state);
905
856
return ARGP_ERR_UNKNOWN;
910
861
struct argp argp = { .options = options, .parser = parse_opt,
912
863
.doc = "Mandos client -- Get and decrypt"
913
" passwords from a Mandos server" };
864
" passwords from mandos server" };
914
865
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
915
866
if (ret == ARGP_ERR_UNKNOWN){
916
fprintf(stderr, "Unknown error while parsing arguments\n");
917
exitcode = EXIT_FAILURE;
922
/* If the interface is down, bring it up */
924
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
927
exitcode = EXIT_FAILURE;
930
strcpy(network.ifr_name, interface);
931
ret = ioctl(sd, SIOCGIFFLAGS, &network);
933
perror("ioctl SIOCGIFFLAGS");
934
exitcode = EXIT_FAILURE;
937
if((network.ifr_flags & IFF_UP) == 0){
938
network.ifr_flags |= IFF_UP;
939
ret = ioctl(sd, SIOCSIFFLAGS, &network);
941
perror("ioctl SIOCSIFFLAGS");
942
exitcode = EXIT_FAILURE;
946
ret = TEMP_FAILURE_RETRY(close(sd));
867
fprintf(stderr, "Unkown error while parsing arguments\n");
868
exitcode = EXIT_FAILURE;
873
pubkeyfile = combinepath(keydir, pubkeyfile);
874
if (pubkeyfile == NULL){
875
perror("combinepath");
876
exitcode = EXIT_FAILURE;
880
seckeyfile = combinepath(keydir, seckeyfile);
881
if (seckeyfile == NULL){
882
perror("combinepath");
886
ret = init_gnutls_global(&mc, pubkeyfile, seckeyfile);
888
fprintf(stderr, "init_gnutls_global\n");
891
gnutls_initalized = true;
955
897
ret = setuid(uid);
957
899
perror("setuid");
962
904
perror("setgid");
965
ret = init_gnutls_global(&mc, pubkey, seckey);
967
fprintf(stderr, "init_gnutls_global failed\n");
968
exitcode = EXIT_FAILURE;
971
gnutls_initalized = true;
974
if(mkdtemp(tempdir) == NULL){
980
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
981
fprintf(stderr, "gpgme_initalized failed\n");
982
exitcode = EXIT_FAILURE;
985
gpgme_initalized = true;
988
907
if_index = (AvahiIfIndex) if_nametoindex(interface);
989
908
if(if_index == 0){
990
909
fprintf(stderr, "No such interface: \"%s\"\n", interface);
940
/* If the interface is down, bring it up */
942
sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);
945
exitcode = EXIT_FAILURE;
948
strcpy(network.ifr_name, interface); /* Spurious warning */
949
ret = ioctl(sd, SIOCGIFFLAGS, &network);
951
perror("ioctl SIOCGIFFLAGS");
952
exitcode = EXIT_FAILURE;
955
if((network.ifr_flags & IFF_UP) == 0){
956
network.ifr_flags |= IFF_UP;
957
ret = ioctl(sd, SIOCSIFFLAGS, &network);
959
perror("ioctl SIOCSIFFLAGS");
960
exitcode = EXIT_FAILURE;
1022
968
avahi_set_log_function(empty_log);
1042
988
config.publish_addresses = 0;
1043
989
config.publish_workstation = 0;
1044
990
config.publish_domain = 0;
1046
992
/* Allocate a new server */
1047
993
mc.server = avahi_server_new(avahi_simple_poll_get
1048
994
(mc.simple_poll), &config, NULL,
1051
997
/* Free the Avahi configuration data */
1052
998
avahi_server_config_free(&config);
1093
1039
if (mc.server != NULL)
1094
1040
avahi_server_free(mc.server);
1096
1042
if (mc.simple_poll != NULL)
1097
1043
avahi_simple_poll_free(mc.simple_poll);
1099
1047
if (gnutls_initalized){
1100
1048
gnutls_certificate_free_credentials(mc.cred);
1101
1049
gnutls_global_deinit ();
1102
gnutls_dh_params_deinit(mc.dh_params);
1105
if(gpgme_initalized){
1106
gpgme_release(mc.ctx);
1109
/* Removes the temp directory used by GPGME */
1110
if(tempdir[0] != '\0'){
1112
struct dirent *direntry;
1113
d = opendir(tempdir);
1118
direntry = readdir(d);
1119
if(direntry == NULL){
1122
if (direntry->d_type == DT_REG){
1123
char *fullname = NULL;
1124
ret = asprintf(&fullname, "%s/%s", tempdir,
1130
ret = unlink(fullname);
1132
fprintf(stderr, "unlink(\"%s\"): %s",
1133
fullname, strerror(errno));
1140
ret = rmdir(tempdir);
1146
1052
return exitcode;