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/*
Unix SMB/CIFS implementation.
kerberos utility library
Copyright (C) Andrew Tridgell 2001
Copyright (C) Remus Koos 2001
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "system/kerberos.h"
#include "system/time.h"
#ifdef HAVE_KRB5
/*
we use a prompter to avoid a crash bug in the kerberos libs when
dealing with empty passwords
this prompter is just a string copy ...
*/
static krb5_error_code
kerb_prompter(krb5_context ctx, void *data,
const char *name,
const char *banner,
int num_prompts,
krb5_prompt prompts[])
{
if (num_prompts == 0) return 0;
memset(prompts[0].reply->data, 0, prompts[0].reply->length);
if (prompts[0].reply->length > 0) {
if (data) {
strncpy(prompts[0].reply->data, data, prompts[0].reply->length-1);
prompts[0].reply->length = strlen(prompts[0].reply->data);
} else {
prompts[0].reply->length = 0;
}
}
return 0;
}
/*
simulate a kinit, putting the tgt in the default cache location
remus@snapserver.com
*/
int kerberos_kinit_password_cc(krb5_context ctx, krb5_ccache cc, const char *principal, const char *password, time_t *expire_time, time_t *kdc_time)
{
krb5_error_code code = 0;
krb5_principal me;
krb5_creds my_creds;
krb5_get_init_creds_opt options;
if ((code = krb5_parse_name(ctx, principal, &me))) {
return code;
}
ZERO_STRUCT(options);
if ((code = krb5_get_init_creds_password(ctx, &my_creds, me, password,
kerb_prompter,
NULL, 0, NULL, &options))) {
krb5_free_principal(ctx, me);
return code;
}
if ((code = krb5_cc_initialize(ctx, cc, me))) {
krb5_free_cred_contents(ctx, &my_creds);
krb5_free_principal(ctx, me);
return code;
}
if ((code = krb5_cc_store_cred(ctx, cc, &my_creds))) {
krb5_free_cred_contents(ctx, &my_creds);
krb5_free_principal(ctx, me);
return code;
}
if (expire_time) {
*expire_time = (time_t) my_creds.times.endtime;
}
if (kdc_time) {
*kdc_time = (time_t) my_creds.times.starttime;
}
krb5_free_cred_contents(ctx, &my_creds);
krb5_free_principal(ctx, me);
return 0;
}
/*
simulate a kinit, putting the tgt in the default cache location
remus@snapserver.com
*/
int kerberos_kinit_password(const char *principal, const char *password, int time_offset, time_t *expire_time, time_t *kdc_time)
{
krb5_context ctx = NULL;
krb5_error_code code = 0;
krb5_ccache cc = NULL;
if ((code = krb5_init_context(&ctx)))
return code;
if (time_offset != 0) {
krb5_set_real_time(ctx, time(NULL) + time_offset, 0);
}
if ((code = krb5_cc_default(ctx, &cc))) {
krb5_free_context(ctx);
return code;
}
if ((code = kerberos_kinit_password_cc(ctx, cc, principal, password, expire_time, kdc_time))) {
krb5_cc_close(ctx, cc);
krb5_free_context(ctx);
return code;
}
return 0;
}
/* run kinit to setup our ccache */
int ads_kinit_password(ADS_STRUCT *ads)
{
char *s;
int ret;
if (asprintf(&s, "%s@%s", ads->auth.user_name, ads->auth.realm) == -1) {
return KRB5_CC_NOMEM;
}
if (!ads->auth.password) {
return KRB5_LIBOS_CANTREADPWD;
}
ret = kerberos_kinit_password(s, ads->auth.password, ads->auth.time_offset, &ads->auth.expire, NULL);
if (ret) {
DEBUG(0,("kerberos_kinit_password %s failed: %s\n",
s, error_message(ret)));
}
free(s);
return ret;
}
int ads_kdestroy(const char *cc_name)
{
krb5_error_code code;
krb5_context ctx = NULL;
krb5_ccache cc = NULL;
if ((code = krb5_init_context (&ctx))) {
DEBUG(3, ("ads_kdestroy: kdb5_init_context rc=%d\n", code));
return code;
}
if (!cc_name) {
if ((code = krb5_cc_default(ctx, &cc))) {
krb5_free_context(ctx);
return code;
}
} else {
if ((code = krb5_cc_resolve(ctx, cc_name, &cc))) {
DEBUG(3, ("ads_kdestroy: krb5_cc_resolve rc=%d\n",
code));
krb5_free_context(ctx);
return code;
}
}
if ((code = krb5_cc_destroy (ctx, cc))) {
DEBUG(3, ("ads_kdestroy: krb5_cc_destroy rc=%d\n", code));
}
krb5_free_context (ctx);
return code;
}
#endif
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