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/* windows/ms2mit/ms2mit.c */
/*
* Copyright (C) 2003 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
#include "k5-int.h"
#include "krb5.h"
#include <stdio.h>
#include <string.h>
#include <time.h>
static char *prog;
static void
xusage(void)
{
fprintf(stderr, "xusage: %s [-c ccache]\n", prog);
exit(1);
}
/* Return true if princ is a local (not cross-realm) krbtgt principal. */
krb5_boolean
is_local_tgt(krb5_principal princ)
{
return princ->length == 2 &&
data_eq_string(princ->data[0], KRB5_TGS_NAME) &&
data_eq(princ->realm, princ->data[1]);
}
/*
* Check if a ccache has any tickets.
*/
static krb5_error_code
cc_has_tickets(krb5_context kcontext, krb5_ccache ccache, int *has_tickets)
{
krb5_error_code code;
krb5_cc_cursor cursor;
krb5_creds creds;
krb5_timestamp now = time(0);
*has_tickets = 0;
code = krb5_cc_set_flags(kcontext, ccache, KRB5_TC_NOTICKET);
if (code)
return code;
code = krb5_cc_start_seq_get(kcontext, ccache, &cursor);
if (code)
return code;
while (!*has_tickets) {
code = krb5_cc_next_cred(kcontext, ccache, &cursor, &creds);
if (code)
break;
if (!krb5_is_config_principal(kcontext, creds.server) &&
ts_after(creds.times.endtime, now))
*has_tickets = 1;
krb5_free_cred_contents(kcontext, &creds);
}
krb5_cc_end_seq_get(kcontext, ccache, &cursor);
return 0;
}
int
main(int argc, char *argv[])
{
krb5_context kcontext = NULL;
krb5_error_code code;
krb5_ccache ccache=NULL;
krb5_ccache mslsa_ccache=NULL;
krb5_cc_cursor cursor;
krb5_creds creds;
krb5_principal princ = NULL;
int found_tgt = 0;
int has_tickets;
int option;
char * ccachestr = 0;
prog = strrchr(argv[0], '/');
prog = prog ? (prog + 1) : argv[0];
while ((option = getopt(argc, argv, "c:h")) != -1) {
switch (option) {
case 'c':
ccachestr = optarg;
break;
case 'h':
default:
xusage();
break;
}
}
if (code = krb5_init_context(&kcontext)) {
com_err(argv[0], code, "while initializing kerberos library");
goto cleanup;
}
if (code = krb5_cc_resolve(kcontext, "MSLSA:", &mslsa_ccache)) {
com_err(argv[0], code, "while opening MS LSA ccache");
goto cleanup;
}
/* Enumerate tickets from cache looking for a TGT */
if ((code = krb5_cc_start_seq_get(kcontext, mslsa_ccache, &cursor))) {
com_err(argv[0], code, "while initiating the cred sequence of MS LSA ccache");
goto cleanup;
}
while (!found_tgt) {
code = krb5_cc_next_cred(kcontext, mslsa_ccache, &cursor, &creds);
if (code)
break;
/* Check if the ticket is a TGT */
if (is_local_tgt(creds.server))
found_tgt = 1;
krb5_free_cred_contents(kcontext, &creds);
}
krb5_cc_end_seq_get(kcontext, mslsa_ccache, &cursor);
if (!found_tgt) {
fprintf(stderr, "%s: Initial Ticket Getting Tickets are not available from the MS LSA\n",
argv[0]);
/* Only set the LSA cache as the default if it actually has tickets. */
code = cc_has_tickets(kcontext, mslsa_ccache, &has_tickets);
if (code)
goto cleanup;
if (has_tickets)
code = krb5int_cc_user_set_default_name(kcontext, "MSLSA:");
goto cleanup;
}
if (code = krb5_cc_get_principal(kcontext, mslsa_ccache, &princ)) {
com_err(argv[0], code, "while obtaining MS LSA principal");
goto cleanup;
}
if (ccachestr)
code = krb5_cc_resolve(kcontext, ccachestr, &ccache);
else
code = krb5_cc_resolve(kcontext, "API:", &ccache);
if (code) {
com_err(argv[0], code, "while getting default ccache");
goto cleanup;
}
if (code = krb5_cc_initialize(kcontext, ccache, princ)) {
com_err (argv[0], code, "when initializing ccache");
goto cleanup;
}
if (code = krb5_cc_copy_creds(kcontext, mslsa_ccache, ccache)) {
com_err (argv[0], code, "while copying MS LSA ccache to default ccache");
goto cleanup;
}
/* Don't try and set the default cache if the cache name was specified. */
if (ccachestr == NULL) {
/* On success set the default cache to API. */
code = krb5int_cc_user_set_default_name(kcontext, "API:");
if (code) {
com_err(argv[0], code, "when setting default to API");
goto cleanup;
}
}
cleanup:
krb5_free_principal(kcontext, princ);
if (ccache != NULL)
krb5_cc_close(kcontext, ccache);
if (mslsa_ccache != NULL)
krb5_cc_close(kcontext, mslsa_ccache);
krb5_free_context(kcontext);
return code ? 1 : 0;
}
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