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/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2010-2021 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include <portable.h>
#ifndef SLAPD_MOD_KINIT
#define SLAPD_MOD_KINIT SLAPD_MOD_DYNAMIC
#endif
#ifdef SLAPD_MOD_KINIT
#include <slap.h>
#include "ldap_rq.h"
#include <ac/errno.h>
#include <ac/string.h>
#include <krb5/krb5.h>
typedef struct kinit_data {
krb5_context ctx;
krb5_ccache ccache;
krb5_keytab keytab;
krb5_principal princ;
krb5_get_init_creds_opt *opts;
} kinit_data;
static char* principal;
static char* kt_name;
static kinit_data *kid;
static void
log_krb5_errmsg( krb5_context ctx, const char* func, krb5_error_code rc )
{
const char* errmsg = krb5_get_error_message(ctx, rc);
Log2(LDAP_DEBUG_ANY, LDAP_LEVEL_ERR, "slapd-kinit: %s: %s\n", func, errmsg);
krb5_free_error_message(ctx, errmsg);
return;
}
static int
kinit_check_tgt(kinit_data *kid, int *remaining)
{
int ret=3;
krb5_principal princ;
krb5_error_code rc;
krb5_cc_cursor cursor;
krb5_creds creds;
char *name;
time_t now=time(NULL);
rc = krb5_cc_get_principal(kid->ctx, kid->ccache, &princ);
if (rc) {
log_krb5_errmsg(kid->ctx, "krb5_cc_get_principal", rc);
return 2;
} else {
if (!krb5_principal_compare(kid->ctx, kid->princ, princ)) {
Log0(LDAP_DEBUG_ANY, LDAP_LEVEL_ERR,
"Principal in ccache does not match requested principal\n");
krb5_free_principal(kid->ctx, princ);
return 2;
}
}
rc = krb5_cc_start_seq_get(kid->ctx, kid->ccache, &cursor);
if (rc) {
log_krb5_errmsg(kid->ctx, "krb5_cc_start_seq_get", rc);
krb5_free_principal(kid->ctx, princ);
return -1;
}
while (!(rc = krb5_cc_next_cred(kid->ctx, kid->ccache, &cursor, &creds))) {
if (krb5_is_config_principal(kid->ctx, creds.server)) {
krb5_free_cred_contents(kid->ctx, &creds);
continue;
}
if (creds.server->length==2 &&
(!strcmp(creds.server->data[0].data, "krbtgt")) &&
(!strcmp(creds.server->data[1].data, princ->realm.data))) {
krb5_unparse_name(kid->ctx, creds.server, &name);
*remaining = (time_t)creds.times.endtime-now;
if ( *remaining <= 0) {
Log1(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: TGT (%s) expired\n", name);
} else {
Log4(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: TGT (%s) expires in %dh:%02dm:%02ds\n",
name, *remaining/3600, (*remaining%3600)/60, *remaining%60);
}
free(name);
if (*remaining <= 30) {
if (creds.times.renew_till-60 > now) {
int renewal=creds.times.renew_till-now;
Log3(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: Time remaining for renewal: %dh:%02dm:%02ds\n",
renewal/3600, (renewal%3600)/60, renewal%60);
ret = 1;
} else {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: Only short time left for renewal. "
"Trying to re-init.\n");
ret = 2;
}
} else {
ret=0;
}
krb5_free_cred_contents(kid->ctx, &creds);
break;
}
krb5_free_cred_contents(kid->ctx, &creds);
}
krb5_cc_end_seq_get(kid->ctx, kid->ccache, &cursor);
krb5_free_principal(kid->ctx, princ);
return ret;
}
void*
kinit_qtask( void *ctx, void *arg )
{
struct re_s *rtask = arg;
kinit_data *kid = (kinit_data*)rtask->arg;
krb5_error_code rc;
krb5_creds creds;
int nextcheck, remaining, renew=0;
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "kinit_qtask: running TGT check\n");
memset(&creds, 0, sizeof(creds));
renew = kinit_check_tgt(kid, &remaining);
if (renew > 0) {
if (renew==1) {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: Trying to renew TGT: ");
rc = krb5_get_renewed_creds(kid->ctx, &creds, kid->princ, kid->ccache, NULL);
if (rc!=0) {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "Failed\n");
log_krb5_errmsg( kid->ctx,
"kinit_qtask, Renewal failed: krb5_get_renewed_creds", rc );
renew++;
} else {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "Success\n");
krb5_cc_initialize(kid->ctx, kid->ccache, creds.client);
krb5_cc_store_cred(kid->ctx, kid->ccache, &creds);
krb5_free_cred_contents(kid->ctx, &creds);
renew=kinit_check_tgt(kid, &remaining);
}
}
if (renew > 1) {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: Trying to get new TGT: ");
rc = krb5_get_init_creds_keytab( kid->ctx, &creds, kid->princ,
kid->keytab, 0, NULL, kid->opts);
if (rc) {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "Failed\n");
log_krb5_errmsg(kid->ctx, "krb5_get_init_creds_keytab", rc);
} else {
Log0(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "Success\n");
renew=kinit_check_tgt(kid, &remaining);
}
krb5_free_cred_contents(kid->ctx, &creds);
}
}
if (renew == 0) {
nextcheck = remaining-30;
} else {
nextcheck = 60;
}
ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
if ( ldap_pvt_runqueue_isrunning( &slapd_rq, rtask )) {
ldap_pvt_runqueue_stoptask( &slapd_rq, rtask );
}
Log3(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG,
"kinit_qtask: Next TGT check in %dh:%02dm:%02ds\n",
nextcheck/3600, (nextcheck%3600)/60, nextcheck%60);
rtask->interval.tv_sec = nextcheck;
ldap_pvt_runqueue_resched( &slapd_rq, rtask, 0 );
slap_wake_listener();
ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
return NULL;
}
int
kinit_initialize(void)
{
Log0( LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "kinit_initialize\n" );
krb5_error_code rc;
struct re_s *task = NULL;
kid = ch_calloc(1, sizeof(kinit_data) );
rc = krb5_init_context( &kid->ctx );
if ( !rc )
rc = krb5_cc_default(kid->ctx, &kid->ccache );
if ( !rc ) {
if (!principal) {
int len=STRLENOF("ldap/")+global_host_bv.bv_len+1;
principal=ch_calloc(len, 1);
snprintf(principal, len, "ldap/%s", global_host_bv.bv_val);
Log1(LDAP_DEBUG_TRACE, LDAP_LEVEL_DEBUG, "Principal <%s>\n", principal);
}
rc = krb5_parse_name(kid->ctx, principal, &kid->princ);
}
if ( !rc && kt_name) {
rc = krb5_kt_resolve(kid->ctx, kt_name, &kid->keytab);
}
if ( !rc )
rc = krb5_get_init_creds_opt_alloc(kid->ctx, &kid->opts);
if ( !rc )
rc = krb5_get_init_creds_opt_set_out_ccache( kid->ctx, kid->opts, kid->ccache);
if ( !rc ) {
ldap_pvt_thread_mutex_lock( &slapd_rq.rq_mutex );
task = ldap_pvt_runqueue_insert( &slapd_rq, 10, kinit_qtask, (void*)kid,
"kinit_qtask", "ldap/bronsted.g17.lan@G17.LAN" );
ldap_pvt_thread_mutex_unlock( &slapd_rq.rq_mutex );
}
if (rc) {
log_krb5_errmsg(kid->ctx, "kinit_initialize", rc);
rc = -1;
}
return rc;
}
#if SLAPD_MOD_KINIT == SLAPD_MOD_DYNAMIC
int init_module(int argc, char *argv[]) {
if (argc > 0) {
principal = ch_strdup(argv[0]);
}
if (argc > 1) {
kt_name = ch_strdup(argv[1]);
}
if (argc > 2) {
return -1;
}
return kinit_initialize();
}
int
term_module() {
if (principal)
ch_free(principal);
if (kt_name)
ch_free(kt_name);
if (kid) {
struct re_s *task;
task=ldap_pvt_runqueue_find( &slapd_rq, kinit_qtask, (void*)kid);
if (task) {
if ( ldap_pvt_runqueue_isrunning(&slapd_rq, task) ) {
ldap_pvt_runqueue_stoptask(&slapd_rq, task);
}
ldap_pvt_runqueue_remove(&slapd_rq, task);
}
if ( kid->ctx ) {
if ( kid->princ )
krb5_free_principal(kid->ctx, kid->princ);
if ( kid->ccache )
krb5_cc_close(kid->ctx, kid->ccache);
if ( kid->keytab )
krb5_kt_close(kid->ctx, kid->keytab);
if ( kid->opts )
krb5_get_init_creds_opt_free(kid->ctx, kid->opts);
krb5_free_context(kid->ctx);
}
ch_free(kid);
}
return 0;
}
#endif
#endif /* SLAPD_MOD_KINIT */
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