int
main (int argc, char *argv[])
{
struct gengetopt_args_info args;
time_t starttime, endtime, renew_till;
Shishi *sh;
int rc;
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
set_program_name (argv[0]);
if (cmdline_parser (argc, argv, &args) != 0)
usage (EXIT_FAILURE);
if (args.version_given)
{
version_etc (stdout, "shishi", PACKAGE_NAME, VERSION,
"Simon Josefsson", (char *) NULL);
return EXIT_SUCCESS;
}
if (args.inputs_num > 2 ||
args.destroy_given + args.list_given + args.renew_given > 1)
{
error (0, 0, _("too many arguments"));
usage (EXIT_FAILURE);
}
if (args.help_given)
usage (EXIT_SUCCESS);
rc = shishi_init_with_paths (&sh, args.ticket_file_arg,
args.system_configuration_file_arg,
args.configuration_file_arg);
if (rc == SHISHI_HANDLE_ERROR)
error (EXIT_FAILURE, 0, _("Could not initialize libshishi."));
rc = shishi_cfg_clientkdcetype_set (sh, args.encryption_type_arg);
if (rc != SHISHI_OK)
error (EXIT_FAILURE, 0, _("Could not set encryption types: %s"),
shishi_strerror (rc));
if (args.inputs_num > 0)
{
rc = shishi_parse_name (sh, args.inputs[0],
(args.client_name_arg ? NULL :
&args.client_name_arg),
(args.realm_arg ? NULL : &args.realm_arg));
if (rc != SHISHI_OK)
error (EXIT_FAILURE, 0,
_("Could not parse client principal \"%s\": %s"),
args.inputs[0], shishi_strerror (rc));
}
if (args.inputs_num > 1)
{
rc = shishi_parse_name (sh, args.inputs[1],
(args.server_name_arg ? NULL :
&args.server_name_arg),
(args.realm_arg ? NULL : &args.realm_arg));
if (rc != SHISHI_OK)
error (EXIT_FAILURE, 0,
_("Could not parse server principal \"%s\": %s"),
args.inputs[1], shishi_strerror (rc));
}
rc = shishi_cfg (sh, args.library_options_arg);
if (rc != SHISHI_OK)
error (EXIT_FAILURE, 0, _("Could not read library options: %s"),
shishi_strerror (rc));
if (args.verbose_given > 0)
shishi_cfg (sh, "verbose");
if (args.verbose_given > 1)
shishi_cfg (sh, "verbose-noise");
if (args.verbose_given > 2)
shishi_cfg (sh, "verbose-asn1");
if (args.verbose_given > 3)
shishi_cfg (sh, "verbose-crypto");
if (args.verbose_given > 4)
shishi_cfg (sh, "verbose-crypto-noise");
if (args.starttime_arg)
{
starttime = shishi_get_date (args.starttime_arg, NULL);
if (starttime == -1)
error (EXIT_FAILURE, 0, _("Invalid --starttime date `%s'"),
args.starttime_arg);
}
else
starttime = time (NULL);
if (args.endtime_arg)
{
endtime = shishi_get_date (args.endtime_arg, &starttime);
if (endtime == -1)
error (EXIT_FAILURE, 0, _("Invalid --endtime date `%s'"),
args.starttime_arg);
}
else
endtime = 0;
if (args.renew_till_arg)
{
renew_till = shishi_get_date (args.renew_till_arg, &starttime);
if (renew_till == -1)
error (EXIT_FAILURE, 0, _("Invalid --renew-till date `%s'"),
args.renew_till_arg);
}
else
renew_till = 0;
if (args.client_name_arg)
shishi_principal_default_set (sh, args.client_name_arg);
if (args.realm_arg)
shishi_realm_default_set (sh, args.realm_arg);
if (!args.ticket_granter_arg)
asprintf (&args.ticket_granter_arg, "krbtgt/%s",
shishi_realm_default (sh));
if (args.list_flag)
{
if (!args.quiet_flag)
printf (_("Tickets in `%s':\n"), shishi_tkts_default_file (sh));
rc = shishi_tkts_print_for_service (shishi_tkts_default (sh),
stdout, args.server_name_arg);
if (rc != SHISHI_OK)
error (EXIT_FAILURE, 0, _("Could not list tickets: %s"),
shishi_strerror (rc));
}
else if (args.destroy_flag)
{
int i, removed = 0;
for (i = 0; i < shishi_tkts_size (shishi_tkts_default (sh)); i++)
{
if (args.server_name_arg &&
!shishi_tkt_server_p (shishi_tkts_nth (shishi_tkts_default (sh),
i),
args.server_name_arg))
continue;
if (args.verbose_given)
{
printf (_("Removing ticket:\n"));
shishi_tkt_pretty_print (shishi_tkts_nth
(shishi_tkts_default (sh), i), stdout);
}
rc = shishi_tkts_remove (shishi_tkts_default (sh), i);
if (rc != SHISHI_OK)
error (EXIT_FAILURE, 0, _("Could not destroy ticket %d:\n%s"), i,
shishi_strerror (rc));
i--;
removed++;
}
if (!args.quiet_flag)
{
if (removed == 0)
printf (_("No tickets removed.\n"));
else
printf (ngettext ("%d ticket removed.\n",
"%d tickets removed.\n", removed), removed);
}
}
else if (args.renew_given)
{
error (EXIT_FAILURE, 0, "Command --renew not implemented.");
}
else
{
Shishi_tkt *tkt;
Shishi_tkts_hint hint;
memset (&hint, 0, sizeof (hint));
hint.client = args.client_name_arg;
hint.server = args.server_name_arg ? args.server_name_arg :
args.ticket_granter_arg;
hint.starttime = starttime;
hint.endtime = endtime;
hint.renew_till = renew_till;
if (args.renewable_flag)
hint.tktflags |= SHISHI_TICKETFLAGS_RENEWABLE;
if (args.proxiable_flag)
hint.tktflags |= SHISHI_TICKETFLAGS_PROXIABLE;
if (args.proxy_flag)
hint.tktflags |= SHISHI_TICKETFLAGS_PROXY;
if (args.forwardable_flag)
hint.tktflags |= SHISHI_TICKETFLAGS_FORWARDABLE;
if (args.forwarded_flag)
hint.tktflags |= SHISHI_TICKETFLAGS_FORWARDED;
tkt = shishi_tkts_get (shishi_tkts_default (sh), &hint);
if (!tkt)
error (EXIT_FAILURE, 0, _("Could not get ticket as `%s' for `%s'."),
hint.client ? hint.client : shishi_principal_default (sh),
hint.server);
shishi_tkt_pretty_print (tkt, stdout);
}
shishi_tkts_expire (shishi_tkts_default (sh));
if (args.ticket_write_file_arg)
shishi_tkts_default_file_set (sh, args.ticket_write_file_arg);
shishi_done (sh);
return EXIT_SUCCESS;
}
/* authentication, server side */
int
get_auth (int infd, krb5_context *ctx, krb5_auth_context *actx,
krb5_keyblock **key, const char **err_msg,
int *protoversion, int *cksumtype,
char **cksum, size_t *cksumlen, char *srvname)
{
char *out;
size_t outlen;
char *buf;
int buflen;
int len;
int rc;
int error;
/* KERBEROS 5 SENDAUTH MESSAGE */
char krb5sendauth[] = "KRB5_SENDAUTH_V1.0";
/* PROTOCOL VERSION */
char krb5kcmd1[] = "KCMDV0.1";
char krb5kcmd2[] = "KCMDV0.2";
char *servername, *server = NULL, *realm = NULL;
*err_msg = NULL;
/* Get key for the server. */
# if 0
/*
* XXX: Taken straight from the version for libshishi.
* XXX: No adaptions yet.
*/
rc = shishi_init_server (handle);
if (rc != SHISHI_OK)
return rc;
if (srvname && *srvname)
{
rc = shishi_parse_name (*handle, srvname, &server, &realm);
if (rc != SHISHI_OK)
{
*err_msg = shishi_strerror (rc);
return rc;
}
}
if (server && *server)
{
char *p;
servername = malloc (sizeof (SERVICE) + strlen (server) + 2);
if (!servername)
{
*err_msg = "Not enough memory";
return SHISHI_TOO_SMALL_BUFFER;
}
p = strchr (server, '/');
if (p && (p != server))
sprintf (servername, "%s", server); /* Non-empty prefix. */
else
sprintf (servername, "%s/%s", SERVICE,
server + (p ? 1 : 0)); /* Remove initial slash. */
}
else
servername = shishi_server_for_local_service (*handle, SERVICE);
if (realm && *realm)
shishi_realm_default_set (*handle, realm);
free (server);
free (realm);
/* Enable use of `~/.k5login'. */
if (shishi_check_version ("1.0.2")) /* Faulty in version 1.0.1. */
{
rc = shishi_cfg_authorizationtype_set (*handle, "k5login basic");
if (rc != SHISHI_OK)
{
*err_msg = shishi_error (*handle);
return rc;
}
}
key = shishi_hostkeys_for_serverrealm (*handle, servername,
shishi_realm_default (*handle));
free (servername);
if (!key)
{
*err_msg = shishi_error (*handle);
return SHISHI_INVALID_KEY;
}
/* Read Kerberos 5 sendauth message */
rc = read (infd, &len, sizeof (int));
if (rc != sizeof (int))
{
*err_msg = "Error reading message size";
return SHISHI_IO_ERROR;
}
buflen = ntohl (len);
buf = malloc (buflen);
if (!buf)
{
*err_msg = "Not enough memory";
return SHISHI_TOO_SMALL_BUFFER;
}
rc = read (infd, buf, buflen);
if (rc != buflen)
{
*err_msg = "Error reading authentication message";
return SHISHI_IO_ERROR;
}
len = strlen (krb5sendauth);
rc = strncmp (buf, krb5sendauth, buflen >= len ? len : buflen);
if (rc)
{
*err_msg = "Invalid authentication type";
/* Authentication type is wrong. */
write (infd, "\001", 1);
return SHISHI_VERIFY_FAILED;
}
free (buf);
/* Read protocol version */
rc = read (infd, &len, sizeof (int));
if (rc != sizeof (int))
{
*err_msg = "Error reading protocol message size";
return SHISHI_IO_ERROR;
}
buflen = ntohl (len);
buf = malloc (buflen);
if (!buf)
{
*err_msg = "Not enough memory";
return SHISHI_TOO_SMALL_BUFFER;
}
rc = read (infd, buf, buflen);
if (rc != buflen)
{
*err_msg = "Error reading protocol message";
return SHISHI_IO_ERROR;
}
len = strlen (krb5kcmd1);
rc = strncmp (buf, krb5kcmd1, buflen >= len ? len : buflen);
if (rc)
{
len = strlen (krb5kcmd2);
rc = strncmp (buf, krb5kcmd2, buflen >= len ? len : buflen);
if (rc)
{
*err_msg = "Protocol version not supported";
/* Protocol version is wrong. */
write (infd, "\002", 1);
return SHISHI_VERIFY_FAILED;
}
*protoversion = 2;
}
else
*protoversion = 1;
free (buf);
/* Authentication type is ok */
write (infd, "\0", 1);
/* Read Authentication request from client */
rc = read (infd, &len, sizeof (int));
if (rc != sizeof (int))
{
*err_msg = "Error reading authentication request size";
return SHISHI_IO_ERROR;
}
buflen = ntohl (len);
buf = malloc (buflen);
if (!buf)
{
*err_msg = "Not enough memory";
return SHISHI_TOO_SMALL_BUFFER;
}
rc = read (infd, buf, buflen);
if (rc != buflen)
{
*err_msg = "Error reading authentication request";
return SHISHI_IO_ERROR;
}
/* Create Authentication context */
rc = shishi_ap_nosubkey (*handle, ap);
if (rc != SHISHI_OK)
return rc;
/* Store request in context */
rc = shishi_ap_req_der_set (*ap, buf, buflen);
if (rc != SHISHI_OK)
return rc;
free (buf);
/* Process authentication request */
rc = shishi_ap_req_process (*ap, key);
if (rc != SHISHI_OK)
return rc;
# ifdef ENCRYPTION
/* extract subkey if present from ap exchange for secure connection */
if (*protoversion == 2)
{
*enckey = NULL;
shishi_authenticator_get_subkey (*handle,
shishi_ap_authenticator (*ap), enckey);
}
# endif
/* Get authenticator checksum */
rc = shishi_authenticator_cksum (*handle,
shishi_ap_authenticator (*ap),
cksumtype, cksum, cksumlen);
if (rc != SHISHI_OK)
return rc;
/* User is authenticated. */
error = 0;
write (infd, &error, sizeof (int));
/* Authenticate ourself to client, if requested. */
if (shishi_apreq_mutual_required_p (*handle, shishi_ap_req (*ap)))
{
int len;
rc = shishi_ap_rep_der (*ap, &out, &outlen);
if (rc != SHISHI_OK)
return rc;
len = outlen;
len = htonl (len);
rc = write (infd, &len, sizeof (len));
if (rc != sizeof (int))
{
*err_msg = "Error sending AP-REP";
free (out);
return SHISHI_IO_ERROR;
}
rc = write (infd, out, ntohl (len));
if (rc != (int) ntohl (len))
{
*err_msg = "Error sending AP-REP";
free (out);
return SHISHI_IO_ERROR;
}
free (out);
/* We are authenticated to client */
}
# ifdef ENCRYPTION
if (*protoversion == 1)
{
Shishi_tkt *tkt;
tkt = shishi_ap_tkt (*ap);
if (tkt == NULL)
{
*err_msg = "Could not get tkt from AP-REQ";
return SHISHI_INVALID_TICKET;
}
rc = shishi_encticketpart_get_key (*handle,
shishi_tkt_encticketpart (tkt),
enckey);
if (rc != SHISHI_OK)
return rc;
}
# endif /* ENCRYPTION */
return 0;
# else
return -1;
# endif
}
/* shishi authentication */
int
shishi_auth (Shishi ** handle, int verbose, char **cname,
const char *sname, int sock,
char *cmd, int port, Shishi_key ** enckey, char *realm)
{
Shishi_ap *ap;
Shishi_tkt *tkt;
Shishi_tkts_hint hint;
Shishi *h;
int rc;
char *out;
int outlen;
int krb5len, msglen;
char *tmpserver;
char auth;
/* KERBEROS 5 SENDAUTH MESSAGE */
char krb5sendauth[] = "KRB5_SENDAUTH_V1.0";
/* PROTOCOL VERSION */
char krb5sendclient[] = "KCMDV0.2";
/* to store error msg sent by server */
char errormsg[101];
char cksumdata[101];
if (!shishi_check_version (SHISHI_VERSION))
{
fprintf (stderr, "shishi_check_version() failed:\n"
"Header file incompatible with shared library.\n");
return 1;
}
if (realm)
shishi_realm_default_set (*handle, realm);
rc = shishi_init (handle);
if (rc != SHISHI_OK)
{
fprintf (stderr,
"error initializing shishi: %s\n", shishi_strerror (rc));
return 1;
}
h = *handle;
if (!*cname)
*cname = (char *) shishi_principal_default (h);
/* size of KRB5 auth message */
krb5len = strlen (krb5sendauth) + 1;
msglen = htonl (krb5len);
write (sock, &msglen, sizeof (int));
/* KRB5 authentication message */
write (sock, krb5sendauth, krb5len);
/* size of client message */
krb5len = strlen (krb5sendclient) + 1;
msglen = htonl (krb5len);
write (sock, &msglen, sizeof (int));
/* KRB5 client message */
write (sock, krb5sendclient, krb5len);
/* get answer from server 0 = ok, 1 = error with message */
read (sock, &auth, 1);
if (auth)
{
read (sock, errormsg, 100);
errormsg[100] = '\0';
fprintf (stderr, "Error during server authentication : %s\n", errormsg);
return 1;
}
if (verbose)
{
printf ("Client: %s\n", *cname);
printf ("Server: %s\n", sname);
}
/* Get a ticket for the server. */
memset (&hint, 0, sizeof (hint));
tmpserver = malloc (strlen (SERVICE) + strlen (sname) + 2);
if (!tmpserver)
{
perror ("shishi_auth()");
return 1;
}
strcpy (tmpserver, SERVICE);
strcat (tmpserver, "/");
strcat (tmpserver, sname);
hint.client = (char *) *cname;
hint.server = (char *) tmpserver;
tkt = shishi_tkts_get (shishi_tkts_default (h), &hint);
if (!tkt)
{
free (tmpserver);
fprintf (stderr, "cannot find ticket for \"%s\"\n", sname);
return 1;
}
free (tmpserver);
if (verbose)
shishi_tkt_pretty_print (tkt, stderr);
/* Create Authentication context */
rc = shishi_ap_tktoptions (h, &ap, tkt, SHISHI_APOPTIONS_MUTUAL_REQUIRED);
if (rc != SHISHI_OK)
{
fprintf (stderr, "cannot create authentication context\n");
return 1;
}
/* checksum = port: terminal name */
snprintf (cksumdata, 100, "%u:%s%s", ntohs (port), cmd, *cname);
/* add checksum to authenticator */
shishi_ap_authenticator_cksumdata_set (ap, cksumdata, strlen (cksumdata));
/* To be compatible with MIT rlogind */
shishi_ap_authenticator_cksumtype_set (ap, SHISHI_RSA_MD5);
/* create der encoded AP-REQ */
rc = shishi_ap_req_der (ap, &out, &outlen);
if (rc != SHISHI_OK)
{
fprintf (stderr, "cannot build authentication request: %s\n",
shishi_strerror (rc));
return 1;
}
if (verbose)
shishi_authenticator_print (h, stderr, shishi_ap_authenticator (ap));
/* extract subkey if present from ap exchange for secure connection */
if (enckey)
shishi_authenticator_get_subkey (h, shishi_ap_authenticator (ap), enckey);
/* send size of AP-REQ to the server */
msglen = htonl (outlen);
write (sock, (char *) &msglen, sizeof (int));
/* send AP-REQ to the server */
write (sock, out, outlen);
/* read a respond from server - what ? */
read (sock, &auth, sizeof (int));
/* For mutual authentication, wait for server reply. */
if (shishi_apreq_mutual_required_p (h, shishi_ap_req (ap)))
{
if (verbose)
printf ("Waiting for server to authenticate itself...\n");
/* read size of the AP-REP */
read (sock, (char *) &outlen, sizeof (int));
/* read AP-REP */
outlen = ntohl (outlen);
outlen = read (sock, out, outlen);
rc = shishi_ap_rep_verify_der (ap, out, outlen);
if (rc == SHISHI_OK)
{
if (verbose)
printf ("AP-REP verification OK...\n");
}
else
{
if (rc == SHISHI_APREP_VERIFY_FAILED)
fprintf (stderr, "AP-REP verification failed...\n");
else
fprintf (stderr, "AP-REP verification error: %s\n",
shishi_strerror (rc));
return 1;
}
/* The server is authenticated. */
if (verbose)
printf ("Server authenticated.\n");
}
/* We are now authenticated. */
if (verbose)
printf ("User authenticated.\n");
return 0;
}
