48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
48
sockaddr_in6, PF_INET6,
50
49
SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
51
#include <inttypes.h> /* PRIu16 */
53
52
#include <sys/socket.h> /* socket(), struct sockaddr_in6,
54
53
struct in6_addr, inet_pton(),
56
#include <fcntl.h> /* open() */
57
#include <dirent.h> /* opendir(), struct dirent, readdir() */
58
#include <inttypes.h> /* PRIu16 */
59
55
#include <assert.h> /* assert() */
60
56
#include <errno.h> /* perror(), errno */
61
57
#include <time.h> /* time() */
62
58
#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
63
59
SIOCSIFFLAGS, if_indextoname(),
64
60
if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
66
61
#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
67
62
getuid(), getgid(), setuid(),
64
#include <netinet/in.h>
69
65
#include <arpa/inet.h> /* inet_pton(), htons */
70
66
#include <iso646.h> /* not, and */
71
67
#include <argp.h> /* struct argp_option, error_t, struct
103
99
#define BUFFER_SIZE 256
105
#define PATHDIR "/conf/conf.d/mandos"
106
#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
109
101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
110
103
static const char mandos_protocol_version[] = "1";
111
const char *argp_program_version = "mandos-client " VERSION;
104
const char *argp_program_version = "password-request 1.0";
112
105
const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
114
107
/* Used for passing in values through the Avahi callback functions */
135
* Decrypt OpenPGP data using keyrings in HOMEDIR.
136
* Returns -1 on error
145
static bool init_gpgme(mandos_context *mc, const char *seckey,
146
const char *pubkey, const char *tempdir){
138
static ssize_t pgp_packet_decrypt (const char *cryptotext,
141
const char *homedir){
142
gpgme_data_t dh_crypto, dh_plain;
148
144
gpgme_error_t rc;
146
size_t plaintext_capacity = 0;
147
ssize_t plaintext_length = 0;
149
148
gpgme_engine_info_t engine_info;
153
* Helper function to insert pub and seckey to the enigne keyring.
155
bool import_key(const char *filename){
157
gpgme_data_t pgp_data;
159
fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
165
rc = gpgme_data_new_from_fd(&pgp_data, fd);
166
if (rc != GPG_ERR_NO_ERROR){
167
fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
168
gpgme_strsource(rc), gpgme_strerror(rc));
172
rc = gpgme_op_import(mc->ctx, pgp_data);
173
if (rc != GPG_ERR_NO_ERROR){
174
fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
175
gpgme_strsource(rc), gpgme_strerror(rc));
179
ret = TEMP_FAILURE_RETRY(close(fd));
183
gpgme_data_release(pgp_data);
188
fprintf(stderr, "Initialize gpgme\n");
151
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
194
157
if (rc != GPG_ERR_NO_ERROR){
195
158
fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
196
159
gpgme_strsource(rc), gpgme_strerror(rc));
200
/* Set GPGME home directory for the OpenPGP engine only */
163
/* Set GPGME home directory for the OpenPGP engine only */
201
164
rc = gpgme_get_engine_info (&engine_info);
202
165
if (rc != GPG_ERR_NO_ERROR){
203
166
fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
204
167
gpgme_strsource(rc), gpgme_strerror(rc));
207
170
while(engine_info != NULL){
208
171
if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
209
172
gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
210
engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
213
176
engine_info = engine_info->next;
215
178
if(engine_info == NULL){
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
220
/* Create new GPGME "context" */
221
rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
224
gpgme_strsource(rc), gpgme_strerror(rc));
228
if (not import_key(pubkey) or not import_key(seckey)){
236
* Decrypt OpenPGP data.
237
* Returns -1 on error
239
static ssize_t pgp_packet_decrypt (const mandos_context *mc,
240
const char *cryptotext,
243
gpgme_data_t dh_crypto, dh_plain;
246
size_t plaintext_capacity = 0;
247
ssize_t plaintext_length = 0;
250
fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
253
183
/* Create new GPGME data buffer from memory cryptotext */
201
/* Create new GPGME "context" */
202
rc = gpgme_new(&ctx);
203
if (rc != GPG_ERR_NO_ERROR){
204
fprintf(stderr, "bad gpgme_new: %s: %s\n",
205
gpgme_strsource(rc), gpgme_strerror(rc));
206
plaintext_length = -1;
271
210
/* Decrypt data from the cryptotext data buffer to the plaintext
273
rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);
212
rc = gpgme_op_decrypt(ctx, dh_crypto, dh_plain);
274
213
if (rc != GPG_ERR_NO_ERROR){
275
214
fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
215
gpgme_strsource(rc), gpgme_strerror(rc));
277
216
plaintext_length = -1;
279
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
282
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
284
fprintf(stderr, "Unsupported algorithm: %s\n",
285
result->unsupported_algorithm);
286
fprintf(stderr, "Wrong key usage: %u\n",
287
result->wrong_key_usage);
288
if(result->file_name != NULL){
289
fprintf(stderr, "File name: %s\n", result->file_name);
291
gpgme_recipient_t recipient;
292
recipient = result->recipients;
294
while(recipient != NULL){
295
fprintf(stderr, "Public key algorithm: %s\n",
296
gpgme_pubkey_algo_name(recipient->pubkey_algo));
297
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
298
fprintf(stderr, "Secret key available: %s\n",
299
recipient->status == GPG_ERR_NO_SECKEY
301
recipient = recipient->next;
306
217
goto decrypt_end;
310
221
fprintf(stderr, "Decryption of OpenPGP data succeeded\n");
225
gpgme_decrypt_result_t result;
226
result = gpgme_op_decrypt_result(ctx);
228
fprintf(stderr, "gpgme_op_decrypt_result failed\n");
230
fprintf(stderr, "Unsupported algorithm: %s\n",
231
result->unsupported_algorithm);
232
fprintf(stderr, "Wrong key usage: %u\n",
233
result->wrong_key_usage);
234
if(result->file_name != NULL){
235
fprintf(stderr, "File name: %s\n", result->file_name);
237
gpgme_recipient_t recipient;
238
recipient = result->recipients;
240
while(recipient != NULL){
241
fprintf(stderr, "Public key algorithm: %s\n",
242
gpgme_pubkey_algo_name(recipient->pubkey_algo));
243
fprintf(stderr, "Key ID: %s\n", recipient->keyid);
244
fprintf(stderr, "Secret key available: %s\n",
245
recipient->status == GPG_ERR_NO_SECKEY
247
recipient = recipient->next;
313
253
/* Seek back to the beginning of the GPGME plaintext data buffer */
314
254
if (gpgme_data_seek(dh_plain, (off_t) 0, SEEK_SET) == -1){
315
perror("gpgme_data_seek");
255
perror("pgpme_data_seek");
316
256
plaintext_length = -1;
317
257
goto decrypt_end;
401
341
/* OpenPGP credentials */
402
342
gnutls_certificate_allocate_credentials(&mc->cred);
403
343
if (ret != GNUTLS_E_SUCCESS){
404
fprintf (stderr, "GnuTLS memory error: %s\n", /* Spurious
344
fprintf (stderr, "GnuTLS memory error: %s\n",
406
345
safer_gnutls_strerror(ret));
407
346
gnutls_global_deinit ();
412
fprintf(stderr, "Attempting to use OpenPGP public key %s and"
413
" secret key %s as GnuTLS credentials\n", pubkeyfilename,
351
fprintf(stderr, "Attempting to use OpenPGP certificate %s"
352
" and keyfile %s as GnuTLS credentials\n", pubkeyfilename,
821
768
char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
769
AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
770
char *pubkeyfilename = NULL;
771
char *seckeyfilename = NULL;
772
const char *pubkeyname = "pubkey.txt";
773
const char *seckeyname = "seckey.txt";
827
774
mandos_context mc = { .simple_poll = NULL, .server = NULL,
828
.dh_bits = 1024, .priority = "SECURE256"
829
":!CTYPE-X.509:+CTYPE-OPENPGP" };
775
.dh_bits = 1024, .priority = "SECURE256"};
830
776
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
834
779
struct argp_option options[] = {
835
780
{ .name = "debug", .key = 128,
836
781
.doc = "Debug mode", .group = 3 },
837
782
{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
784
.doc = "Connect directly to a sepcified mandos server",
841
786
{ .name = "interface", .key = 'i',
843
.doc = "Interface that will be used to search for Mandos"
788
.doc = "Interface that Avahi will conntect through",
790
{ .name = "keydir", .key = 'd',
792
.doc = "Directory where the openpgp keyring is",
846
794
{ .name = "seckey", .key = 's',
848
.doc = "OpenPGP secret key file base name",
796
.doc = "Secret openpgp key for gnutls authentication",
850
798
{ .name = "pubkey", .key = 'p',
852
.doc = "OpenPGP public key file base name",
800
.doc = "Public openpgp key for gnutls authentication",
854
802
{ .name = "dh-bits", .key = 129,
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
804
.doc = "dh-bits to use in gnutls communication",
859
806
{ .name = "priority", .key = 130,
861
.doc = "GnuTLS priority string for the TLS handshake",
808
.doc = "GNUTLS priority", .group = 1 },
866
813
error_t parse_opt (int key, char *arg,
867
814
struct argp_state *state) {
868
815
/* Get the INPUT argument from `argp_parse', which we know is
869
816
a pointer to our plugin list pointer. */
871
case 128: /* --debug */
874
case 'c': /* --connect */
875
822
connect_to = arg;
877
case 'i': /* --interface */
880
case 's': /* --seckey */
883
case 'p': /* --pubkey */
886
case 129: /* --dh-bits */
888
838
mc.dh_bits = (unsigned int) strtol(arg, NULL, 10);
907
857
struct argp argp = { .options = options, .parser = parse_opt,
909
859
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
860
" passwords from mandos server" };
911
861
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
862
if (ret == ARGP_ERR_UNKNOWN){
913
863
fprintf(stderr, "Unknown error while parsing arguments\n");
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;
919
892
/* If the interface is down, bring it up */
959
929
perror("setgid");
962
ret = init_gnutls_global(&mc, pubkey, seckey);
964
fprintf(stderr, "init_gnutls_global failed\n");
965
exitcode = EXIT_FAILURE;
968
gnutls_initalized = true;
971
if(mkdtemp(tempdir) == NULL){
977
if(not init_gpgme(&mc, pubkey, seckey, tempdir)){
978
fprintf(stderr, "gpgme_initalized failed\n");
979
exitcode = EXIT_FAILURE;
982
gpgme_initalized = true;
985
932
if_index = (AvahiIfIndex) if_nametoindex(interface);
986
933
if(if_index == 0){
987
934
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1090
1037
if (mc.server != NULL)
1091
1038
avahi_server_free(mc.server);
1093
1040
if (mc.simple_poll != NULL)
1094
1041
avahi_simple_poll_free(mc.simple_poll);
1042
free(pubkeyfilename);
1043
free(seckeyfilename);
1096
1045
if (gnutls_initalized){
1097
1046
gnutls_certificate_free_credentials(mc.cred);
1098
1047
gnutls_global_deinit ();
1099
gnutls_dh_params_deinit(mc.dh_params);
1102
if(gpgme_initalized){
1103
gpgme_release(mc.ctx);
1106
/* Removes the temp directory used by GPGME */
1107
if(tempdir[0] != '\0'){
1109
struct dirent *direntry;
1110
d = opendir(tempdir);
1115
direntry = readdir(d);
1116
if(direntry == NULL){
1119
if (direntry->d_type == DT_REG){
1120
char *fullname = NULL;
1121
ret = asprintf(&fullname, "%s/%s", tempdir,
1127
ret = unlink(fullname);
1129
fprintf(stderr, "unlink(\"%s\"): %s",
1130
fullname, strerror(errno));
1137
ret = rmdir(tempdir);
1143
1050
return exitcode;