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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/ccache/ccselect.c - krb5_cc_select API and module loader */
/*
* Copyright (C) 2011 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 "cc-int.h"
#include <krb5/ccselect_plugin.h>
#include "../krb/int-proto.h"
struct ccselect_module_handle {
struct krb5_ccselect_vtable_st vt;
krb5_ccselect_moddata data;
int priority;
};
static void
free_handles(krb5_context context, struct ccselect_module_handle **handles)
{
struct ccselect_module_handle *h, **hp;
if (handles == NULL)
return;
for (hp = handles; *hp != NULL; hp++) {
h = *hp;
if (h->vt.fini)
h->vt.fini(context, h->data);
free(h);
}
free(handles);
}
static krb5_error_code
load_modules(krb5_context context)
{
krb5_error_code ret;
struct ccselect_module_handle **list = NULL, *handle;
krb5_plugin_initvt_fn *modules = NULL, *mod;
size_t count;
#ifndef _WIN32
ret = k5_plugin_register(context, PLUGIN_INTERFACE_CCSELECT, "k5identity",
ccselect_k5identity_initvt);
if (ret != 0)
goto cleanup;
#endif
ret = k5_plugin_register(context, PLUGIN_INTERFACE_CCSELECT, "realm",
ccselect_realm_initvt);
if (ret != 0)
goto cleanup;
ret = k5_plugin_load_all(context, PLUGIN_INTERFACE_CCSELECT, &modules);
if (ret != 0)
goto cleanup;
/* Allocate a large enough list of handles. */
for (count = 0; modules[count] != NULL; count++);
list = k5calloc(count + 1, sizeof(*list), &ret);
if (list == NULL)
goto cleanup;
/* Initialize each module, ignoring ones that fail. */
count = 0;
for (mod = modules; *mod != NULL; mod++) {
handle = k5alloc(sizeof(*handle), &ret);
if (handle == NULL)
goto cleanup;
ret = (*mod)(context, 1, 1, (krb5_plugin_vtable)&handle->vt);
if (ret != 0) { /* Failed vtable init is non-fatal. */
TRACE_CCSELECT_VTINIT_FAIL(context, ret);
free(handle);
continue;
}
handle->data = NULL;
ret = handle->vt.init(context, &handle->data, &handle->priority);
if (ret != 0) { /* Failed initialization is non-fatal. */
TRACE_CCSELECT_INIT_FAIL(context, handle->vt.name, ret);
free(handle);
continue;
}
list[count++] = handle;
list[count] = NULL;
}
list[count] = NULL;
ret = 0;
context->ccselect_handles = list;
list = NULL;
cleanup:
k5_plugin_free_modules(context, modules);
free_handles(context, list);
return ret;
}
static krb5_error_code
choose(krb5_context context, struct ccselect_module_handle *h,
krb5_principal server, krb5_ccache *cache_out,
krb5_principal *princ_out)
{
return h->vt.choose(context, h->data, server, cache_out, princ_out);
}
krb5_error_code KRB5_CALLCONV
krb5_cc_select(krb5_context context, krb5_principal server,
krb5_ccache *cache_out, krb5_principal *princ_out)
{
krb5_error_code ret;
int priority;
struct ccselect_module_handle **hp, *h;
krb5_ccache cache;
krb5_principal princ;
*cache_out = NULL;
*princ_out = NULL;
if (context->ccselect_handles == NULL) {
ret = load_modules(context);
if (ret)
return ret;
}
/* Consult authoritative modules first, then heuristic ones. */
for (priority = KRB5_CCSELECT_PRIORITY_AUTHORITATIVE;
priority >= KRB5_CCSELECT_PRIORITY_HEURISTIC; priority--) {
for (hp = context->ccselect_handles; *hp != NULL; hp++) {
h = *hp;
if (h->priority != priority)
continue;
ret = choose(context, h, server, &cache, &princ);
if (ret == 0) {
TRACE_CCSELECT_MODCHOICE(context, h->vt.name, server, cache,
princ);
*cache_out = cache;
*princ_out = princ;
return 0;
} else if (ret == KRB5_CC_NOTFOUND) {
TRACE_CCSELECT_MODNOTFOUND(context, h->vt.name, server, princ);
*princ_out = princ;
return ret;
} else if (ret != KRB5_PLUGIN_NO_HANDLE) {
TRACE_CCSELECT_MODFAIL(context, h->vt.name, ret, server);
return ret;
}
}
}
TRACE_CCSELECT_NOTFOUND(context, server);
return KRB5_CC_NOTFOUND;
}
void
k5_ccselect_free_context(krb5_context context)
{
free_handles(context, context->ccselect_handles);
context->ccselect_handles = NULL;
}
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