48
47
#include <sys/types.h> /* socket(), inet_pton(), sockaddr,
49
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sockaddr_in6, PF_INET6,
50
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SOCK_STREAM, INET6_ADDRSTRLEN,
51
uid_t, gid_t, open(), opendir(), DIR */
52
#include <sys/stat.h> /* open() */
51
#include <inttypes.h> /* PRIu16 */
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#include <sys/socket.h> /* socket(), struct sockaddr_in6,
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struct in6_addr, inet_pton(),
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#include <fcntl.h> /* open() */
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#include <dirent.h> /* opendir(), struct dirent, readdir() */
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#include <inttypes.h> /* PRIu16 */
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#include <assert.h> /* assert() */
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#include <errno.h> /* perror(), errno */
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#include <time.h> /* time() */
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#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
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SIOCSIFFLAGS, if_indextoname(),
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if_nametoindex(), IF_NAMESIZE */
65
#include <netinet/in.h>
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#include <unistd.h> /* close(), SEEK_SET, off_t, write(),
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getuid(), getgid(), setuid(),
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#include <netinet/in.h>
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#include <arpa/inet.h> /* inet_pton(), htons */
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#include <iso646.h> /* not, and */
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#include <argp.h> /* struct argp_option, error_t, struct
103
99
#define BUFFER_SIZE 256
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#define PATHDIR "/conf/conf.d/mandos"
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#define SECKEY "seckey.txt"
107
#define PUBKEY "pubkey.txt"
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101
bool debug = false;
102
static const char *keydir = "/conf/conf.d/mandos";
110
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static const char mandos_protocol_version[] = "1";
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const char *argp_program_version = "mandos-client " VERSION;
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const char *argp_program_version = "password-request 1.0";
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const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";
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/* Used for passing in values through the Avahi callback functions */
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* Decrypt OpenPGP data using keyrings in HOMEDIR.
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* Returns -1 on error
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static bool init_gpgme(mandos_context *mc, const char *seckey,
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const char *pubkey, const char *tempdir){
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static ssize_t pgp_packet_decrypt (const char *cryptotext,
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const char *homedir){
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gpgme_data_t dh_crypto, dh_plain;
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gpgme_error_t rc;
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size_t plaintext_capacity = 0;
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ssize_t plaintext_length = 0;
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gpgme_engine_info_t engine_info;
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* Helper function to insert pub and seckey to the enigne keyring.
155
bool import_key(const char *filename){
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gpgme_data_t pgp_data;
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fd = TEMP_FAILURE_RETRY(open(filename, O_RDONLY));
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rc = gpgme_data_new_from_fd(&pgp_data, fd);
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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rc = gpgme_op_import(mc->ctx, pgp_data);
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_op_import: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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ret = TEMP_FAILURE_RETRY(close(fd));
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gpgme_data_release(pgp_data);
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fprintf(stderr, "Initialize gpgme\n");
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fprintf(stderr, "Trying to decrypt OpenPGP data\n");
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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/* Set GPGME home directory for the OpenPGP engine only */
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/* Set GPGME home directory for the OpenPGP engine only */
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rc = gpgme_get_engine_info (&engine_info);
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if (rc != GPG_ERR_NO_ERROR){
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fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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while(engine_info != NULL){
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if(engine_info->protocol == GPGME_PROTOCOL_OpenPGP){
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gpgme_set_engine_info(GPGME_PROTOCOL_OpenPGP,
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engine_info->file_name, tempdir);
173
engine_info->file_name, homedir);
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engine_info = engine_info->next;
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if(engine_info == NULL){
216
fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);
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/* Create new GPGME "context" */
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rc = gpgme_new(&(mc->ctx));
222
if (rc != GPG_ERR_NO_ERROR){
223
fprintf(stderr, "bad gpgme_new: %s: %s\n",
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gpgme_strsource(rc), gpgme_strerror(rc));
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if (not import_key(pubkey) or not import_key(seckey)){
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* Decrypt OpenPGP data.
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* 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;
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ssize_t plaintext_length = 0;
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fprintf(stderr, "Trying to decrypt OpenPGP data\n");
179
fprintf(stderr, "Could not set GPGME home dir to %s\n", homedir);
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/* 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",
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gpgme_strsource(rc), gpgme_strerror(rc));
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plaintext_length = -1;
271
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/* 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
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fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",
276
215
gpgme_strsource(rc), gpgme_strerror(rc));
277
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plaintext_length = -1;
279
218
gpgme_decrypt_result_t result;
280
result = gpgme_op_decrypt_result(mc->ctx);
219
result = gpgme_op_decrypt_result(ctx);
281
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if (result == NULL){
282
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fprintf(stderr, "gpgme_op_decrypt_result failed\n");
422
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"Error[%d] while reading the OpenPGP key pair ('%s',"
423
362
" '%s')\n", ret, pubkeyfilename, seckeyfilename);
424
fprintf(stderr, "The GnuTLS error is: %s\n",
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fprintf(stdout, "The GnuTLS error is: %s\n",
425
364
safer_gnutls_strerror(ret));
748
/* Combines file name and path and returns the malloced new
749
string. some sane checks could/should be added */
750
static char *combinepath(const char *first, const char *second){
752
int ret = asprintf(&tmp, "%s/%s", first, second);
811
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int main(int argc, char *argv[]){
812
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AvahiSServiceBrowser *sb = NULL;
821
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char *connect_to = NULL;
822
char tempdir[] = "/tmp/mandosXXXXXX";
823
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AvahiIfIndex if_index = AVAHI_IF_UNSPEC;
824
const char *seckey = PATHDIR "/" SECKEY;
825
const char *pubkey = PATHDIR "/" PUBKEY;
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char *pubkeyfilename = NULL;
773
char *seckeyfilename = NULL;
774
const char *pubkeyname = "pubkey.txt";
775
const char *seckeyname = "seckey.txt";
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mandos_context mc = { .simple_poll = NULL, .server = NULL,
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.dh_bits = 1024, .priority = "SECURE256"
829
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":!CTYPE-X.509:+CTYPE-OPENPGP" };
830
779
bool gnutls_initalized = false;
831
bool gpgme_initalized = false;
834
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struct argp_option options[] = {
835
783
{ .name = "debug", .key = 128,
836
784
.doc = "Debug mode", .group = 3 },
837
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{ .name = "connect", .key = 'c',
838
.arg = "ADDRESS:PORT",
839
.doc = "Connect directly to a specific Mandos server",
787
.doc = "Connect directly to a sepcified mandos server",
841
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{ .name = "interface", .key = 'i',
843
.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",
846
797
{ .name = "seckey", .key = 's',
848
.doc = "OpenPGP secret key file base name",
799
.doc = "Secret openpgp key for gnutls authentication",
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801
{ .name = "pubkey", .key = 'p',
852
.doc = "OpenPGP public key file base name",
803
.doc = "Public openpgp key for gnutls authentication",
854
805
{ .name = "dh-bits", .key = 129,
856
.doc = "Bit length of the prime number used in the"
857
" Diffie-Hellman key exchange",
807
.doc = "dh-bits to use in gnutls communication",
859
809
{ .name = "priority", .key = 130,
861
.doc = "GnuTLS priority string for the TLS handshake",
811
.doc = "GNUTLS priority", .group = 1 },
866
816
error_t parse_opt (int key, char *arg,
867
817
struct argp_state *state) {
907
860
struct argp argp = { .options = options, .parser = parse_opt,
909
862
.doc = "Mandos client -- Get and decrypt"
910
" passwords from a Mandos server" };
863
" passwords from mandos server" };
911
864
ret = argp_parse (&argp, argc, argv, 0, 0, NULL);
912
865
if (ret == ARGP_ERR_UNKNOWN){
913
866
fprintf(stderr, "Unknown error while parsing arguments\n");
872
pubkeyfilename = combinepath(keydir, pubkeyname);
873
if (pubkeyfilename == NULL){
874
perror("combinepath");
875
exitcode = EXIT_FAILURE;
879
seckeyfilename = combinepath(keydir, seckeyname);
880
if (seckeyfilename == NULL){
881
perror("combinepath");
882
exitcode = EXIT_FAILURE;
886
ret = init_gnutls_global(&mc, pubkeyfilename, seckeyfilename);
888
fprintf(stderr, "init_gnutls_global failed\n");
889
exitcode = EXIT_FAILURE;
892
gnutls_initalized = true;
919
895
/* If the interface is down, bring it up */
959
932
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
935
if_index = (AvahiIfIndex) if_nametoindex(interface);
986
936
if(if_index == 0){
987
937
fprintf(stderr, "No such interface: \"%s\"\n", interface);
1039
989
config.publish_addresses = 0;
1040
990
config.publish_workstation = 0;
1041
991
config.publish_domain = 0;
1043
993
/* Allocate a new server */
1044
994
mc.server = avahi_server_new(avahi_simple_poll_get
1045
995
(mc.simple_poll), &config, NULL,
1048
998
/* Free the Avahi configuration data */
1049
999
avahi_server_config_free(&config);
1090
1040
if (mc.server != NULL)
1091
1041
avahi_server_free(mc.server);
1093
1043
if (mc.simple_poll != NULL)
1094
1044
avahi_simple_poll_free(mc.simple_poll);
1045
free(pubkeyfilename);
1046
free(seckeyfilename);
1096
1048
if (gnutls_initalized){
1097
1049
gnutls_certificate_free_credentials(mc.cred);
1098
1050
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
1053
return exitcode;