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/*
* 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
*/
/**
* $Id$
* @file krb5.h
* @brief Context management functions for rlm_krb5
*
* @copyright 2013 The FreeRADIUS server project
* @copyright 2013 Arran Cudbard-Bell <a.cudbardb@freeradius.org>
*/
RCSID("$Id$")
#include <freeradius-devel/radiusd.h>
#include "krb5.h"
#ifdef HAVE_KRB5_GET_ERROR_MESSAGE
# define KRB5_STRERROR_BUFSIZE (2048)
fr_thread_local_setup(char *, krb5_error_buffer) /* macro */
/*
* Explicitly cleanup the memory allocated to the error buffer.
*/
static void _krb5_logging_free(void *arg)
{
free(arg);
}
char const *rlm_krb5_error(krb5_context context, krb5_error_code code)
{
char const *msg;
char *buffer;
buffer = fr_thread_local_init(krb5_error_buffer, _krb5_logging_free);
if (!buffer) {
int ret;
/*
* malloc is thread safe, talloc is not
*/
buffer = malloc(sizeof(char) * KRB5_STRERROR_BUFSIZE);
if (!buffer) {
ERROR("Failed allocating memory for krb5 error buffer");
return NULL;
}
ret = fr_thread_local_set(krb5_error_buffer, buffer);
if (ret != 0) {
ERROR("Failed setting up TLS for krb5 error buffer: %s", fr_syserror(ret));
free(buffer);
return NULL;
}
}
msg = krb5_get_error_message(context, code);
if (msg) {
strlcpy(buffer, msg, KRB5_STRERROR_BUFSIZE);
# ifdef HAVE_KRB5_FREE_ERROR_MESSAGE
krb5_free_error_message(context, msg);
# elif defined(HAVE_KRB5_FREE_ERROR_STRING)
{
char *free;
memcpy(&free, &msg, sizeof(free));
krb5_free_error_string(context, free);
}
# else
# error "No way to free error strings, missing krb5_free_error_message() and krb5_free_error_string()"
# endif
} else {
strlcpy(buffer, "Unknown error", KRB5_STRERROR_BUFSIZE);
}
return buffer;
}
#endif
/** Frees libkrb5 resources associated with the handle
*
* Must not be called directly.
*
* @param conn to free.
* @return 0 (always indicates success).
*/
static int _mod_conn_free(rlm_krb5_handle_t *conn) {
krb5_free_context(conn->context);
if (conn->keytab) krb5_kt_close(conn->context, conn->keytab);
#ifdef HEIMDAL_KRB5
if (conn->ccache) krb5_cc_destroy(conn->context, conn->ccache);
#endif
return 0;
}
/** Create and return a new connection
*
* libkrb5(s) can talk to the KDC over TCP. Were assuming something sane is implemented
* by libkrb5 and that it does connection caching associated with contexts, so it's
* worth using a connection pool to preserve connections when workers die.
*/
void *mod_conn_create(TALLOC_CTX *ctx, void *instance)
{
rlm_krb5_t *inst = instance;
rlm_krb5_handle_t *conn;
krb5_error_code ret;
MEM(conn = talloc_zero(ctx, rlm_krb5_handle_t));
ret = krb5_init_context(&conn->context);
if (ret) {
ERROR("rlm_krb5 (%s): Context initialisation failed: %s", inst->xlat_name,
rlm_krb5_error(NULL, ret));
return NULL;
}
talloc_set_destructor(conn, _mod_conn_free);
ret = inst->keytabname ?
krb5_kt_resolve(conn->context, inst->keytabname, &conn->keytab) :
krb5_kt_default(conn->context, &conn->keytab);
if (ret) {
ERROR("Resolving keytab failed: %s", rlm_krb5_error(conn->context, ret));
goto cleanup;
}
#ifdef HEIMDAL_KRB5
ret = krb5_cc_new_unique(conn->context, "MEMORY", NULL, &conn->ccache);
if (ret) {
ERROR("rlm_krb5 (%s): Credential cache creation failed: %s", inst->xlat_name,
rlm_krb5_error(conn->context, ret));
return NULL;
}
krb5_verify_opt_init(&conn->options);
krb5_verify_opt_set_ccache(&conn->options, conn->ccache);
krb5_verify_opt_set_keytab(&conn->options, conn->keytab);
krb5_verify_opt_set_secure(&conn->options, true);
if (inst->service) krb5_verify_opt_set_service(&conn->options, inst->service);
#else
krb5_verify_init_creds_opt_set_ap_req_nofail(inst->vic_options, true);
#endif
return conn;
cleanup:
talloc_free(conn);
return NULL;
}
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