399 lines
11 KiB
C
399 lines
11 KiB
C
/*
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* Copyright (c) 1997 - 2005 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5/gsskrb5_locl.h"
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RCSID("$Id: acquire_cred.c 22124 2007-12-04 00:03:52Z lha $");
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OM_uint32
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__gsskrb5_ccache_lifetime(OM_uint32 *minor_status,
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krb5_context context,
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krb5_ccache id,
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krb5_principal principal,
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OM_uint32 *lifetime)
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{
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krb5_creds in_cred, *out_cred;
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krb5_const_realm realm;
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krb5_error_code kret;
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memset(&in_cred, 0, sizeof(in_cred));
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in_cred.client = principal;
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realm = krb5_principal_get_realm(context, principal);
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if (realm == NULL) {
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_gsskrb5_clear_status ();
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*minor_status = KRB5_PRINC_NOMATCH; /* XXX */
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return GSS_S_FAILURE;
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}
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kret = krb5_make_principal(context, &in_cred.server,
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realm, KRB5_TGS_NAME, realm, NULL);
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if (kret) {
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*minor_status = kret;
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return GSS_S_FAILURE;
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}
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kret = krb5_get_credentials(context, 0,
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id, &in_cred, &out_cred);
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krb5_free_principal(context, in_cred.server);
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if (kret) {
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*minor_status = kret;
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return GSS_S_FAILURE;
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}
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*lifetime = out_cred->times.endtime;
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krb5_free_creds(context, out_cred);
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return GSS_S_COMPLETE;
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}
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static krb5_error_code
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get_keytab(krb5_context context, krb5_keytab *keytab)
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{
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char kt_name[256];
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krb5_error_code kret;
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HEIMDAL_MUTEX_lock(&gssapi_keytab_mutex);
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if (_gsskrb5_keytab != NULL) {
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kret = krb5_kt_get_name(context,
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_gsskrb5_keytab,
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kt_name, sizeof(kt_name));
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if (kret == 0)
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kret = krb5_kt_resolve(context, kt_name, keytab);
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} else
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kret = krb5_kt_default(context, keytab);
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HEIMDAL_MUTEX_unlock(&gssapi_keytab_mutex);
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return (kret);
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}
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static OM_uint32 acquire_initiator_cred
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(OM_uint32 * minor_status,
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krb5_context context,
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const gss_name_t desired_name,
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OM_uint32 time_req,
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const gss_OID_set desired_mechs,
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gss_cred_usage_t cred_usage,
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gsskrb5_cred handle,
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gss_OID_set * actual_mechs,
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OM_uint32 * time_rec
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)
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{
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OM_uint32 ret;
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krb5_creds cred;
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krb5_principal def_princ;
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krb5_get_init_creds_opt *opt;
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krb5_ccache ccache;
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krb5_keytab keytab;
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krb5_error_code kret;
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keytab = NULL;
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ccache = NULL;
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def_princ = NULL;
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ret = GSS_S_FAILURE;
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memset(&cred, 0, sizeof(cred));
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/* If we have a preferred principal, lets try to find it in all
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* caches, otherwise, fall back to default cache. Ignore
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* errors. */
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if (handle->principal)
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kret = krb5_cc_cache_match (context,
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handle->principal,
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NULL,
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&ccache);
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if (ccache == NULL) {
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kret = krb5_cc_default(context, &ccache);
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if (kret)
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goto end;
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}
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kret = krb5_cc_get_principal(context, ccache,
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&def_princ);
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if (kret != 0) {
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/* we'll try to use a keytab below */
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krb5_cc_destroy(context, ccache);
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ccache = NULL;
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kret = 0;
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} else if (handle->principal == NULL) {
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kret = krb5_copy_principal(context, def_princ,
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&handle->principal);
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if (kret)
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goto end;
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} else if (handle->principal != NULL &&
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krb5_principal_compare(context, handle->principal,
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def_princ) == FALSE) {
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/* Before failing, lets check the keytab */
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krb5_free_principal(context, def_princ);
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def_princ = NULL;
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}
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if (def_princ == NULL) {
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/* We have no existing credentials cache,
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* so attempt to get a TGT using a keytab.
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*/
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if (handle->principal == NULL) {
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kret = krb5_get_default_principal(context,
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&handle->principal);
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if (kret)
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goto end;
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}
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kret = get_keytab(context, &keytab);
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if (kret)
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goto end;
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kret = krb5_get_init_creds_opt_alloc(context, &opt);
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if (kret)
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goto end;
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kret = krb5_get_init_creds_keytab(context, &cred,
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handle->principal, keytab, 0, NULL, opt);
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krb5_get_init_creds_opt_free(context, opt);
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if (kret)
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goto end;
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kret = krb5_cc_gen_new(context, &krb5_mcc_ops,
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&ccache);
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if (kret)
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goto end;
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kret = krb5_cc_initialize(context, ccache, cred.client);
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if (kret)
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goto end;
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kret = krb5_cc_store_cred(context, ccache, &cred);
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if (kret)
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goto end;
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handle->lifetime = cred.times.endtime;
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handle->cred_flags |= GSS_CF_DESTROY_CRED_ON_RELEASE;
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} else {
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ret = __gsskrb5_ccache_lifetime(minor_status,
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context,
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ccache,
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handle->principal,
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&handle->lifetime);
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if (ret != GSS_S_COMPLETE)
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goto end;
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kret = 0;
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}
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handle->ccache = ccache;
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ret = GSS_S_COMPLETE;
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end:
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if (cred.client != NULL)
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krb5_free_cred_contents(context, &cred);
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if (def_princ != NULL)
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krb5_free_principal(context, def_princ);
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if (keytab != NULL)
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krb5_kt_close(context, keytab);
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if (ret != GSS_S_COMPLETE) {
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if (ccache != NULL)
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krb5_cc_close(context, ccache);
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if (kret != 0) {
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*minor_status = kret;
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}
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}
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return (ret);
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}
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static OM_uint32 acquire_acceptor_cred
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(OM_uint32 * minor_status,
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krb5_context context,
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const gss_name_t desired_name,
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OM_uint32 time_req,
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const gss_OID_set desired_mechs,
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gss_cred_usage_t cred_usage,
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gsskrb5_cred handle,
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gss_OID_set * actual_mechs,
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OM_uint32 * time_rec
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)
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{
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OM_uint32 ret;
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krb5_error_code kret;
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kret = 0;
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ret = GSS_S_FAILURE;
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kret = get_keytab(context, &handle->keytab);
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if (kret)
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goto end;
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/* check that the requested principal exists in the keytab */
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if (handle->principal) {
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krb5_keytab_entry entry;
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kret = krb5_kt_get_entry(context, handle->keytab,
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handle->principal, 0, 0, &entry);
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if (kret)
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goto end;
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krb5_kt_free_entry(context, &entry);
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ret = GSS_S_COMPLETE;
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} else {
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/*
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* Check if there is at least one entry in the keytab before
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* declaring it as an useful keytab.
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*/
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krb5_keytab_entry tmp;
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krb5_kt_cursor c;
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kret = krb5_kt_start_seq_get (context, handle->keytab, &c);
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if (kret)
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goto end;
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if (krb5_kt_next_entry(context, handle->keytab, &tmp, &c) == 0) {
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krb5_kt_free_entry(context, &tmp);
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ret = GSS_S_COMPLETE; /* ok found one entry */
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}
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krb5_kt_end_seq_get (context, handle->keytab, &c);
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}
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end:
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if (ret != GSS_S_COMPLETE) {
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if (handle->keytab != NULL)
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krb5_kt_close(context, handle->keytab);
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if (kret != 0) {
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*minor_status = kret;
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}
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}
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return (ret);
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}
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OM_uint32 _gsskrb5_acquire_cred
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(OM_uint32 * minor_status,
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const gss_name_t desired_name,
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OM_uint32 time_req,
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const gss_OID_set desired_mechs,
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gss_cred_usage_t cred_usage,
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gss_cred_id_t * output_cred_handle,
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gss_OID_set * actual_mechs,
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OM_uint32 * time_rec
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)
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{
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krb5_context context;
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gsskrb5_cred handle;
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OM_uint32 ret;
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if (cred_usage != GSS_C_ACCEPT && cred_usage != GSS_C_INITIATE && cred_usage != GSS_C_BOTH) {
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*minor_status = GSS_KRB5_S_G_BAD_USAGE;
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return GSS_S_FAILURE;
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}
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GSSAPI_KRB5_INIT(&context);
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*output_cred_handle = NULL;
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if (time_rec)
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*time_rec = 0;
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if (actual_mechs)
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*actual_mechs = GSS_C_NO_OID_SET;
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if (desired_mechs) {
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int present = 0;
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ret = gss_test_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
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desired_mechs, &present);
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if (ret)
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return ret;
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if (!present) {
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*minor_status = 0;
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return GSS_S_BAD_MECH;
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}
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}
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handle = calloc(1, sizeof(*handle));
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if (handle == NULL) {
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*minor_status = ENOMEM;
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return (GSS_S_FAILURE);
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}
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HEIMDAL_MUTEX_init(&handle->cred_id_mutex);
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if (desired_name != GSS_C_NO_NAME) {
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krb5_principal name = (krb5_principal)desired_name;
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ret = krb5_copy_principal(context, name, &handle->principal);
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if (ret) {
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HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
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*minor_status = ret;
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free(handle);
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return GSS_S_FAILURE;
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}
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}
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if (cred_usage == GSS_C_INITIATE || cred_usage == GSS_C_BOTH) {
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ret = acquire_initiator_cred(minor_status, context,
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desired_name, time_req,
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desired_mechs, cred_usage, handle,
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actual_mechs, time_rec);
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if (ret != GSS_S_COMPLETE) {
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HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
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krb5_free_principal(context, handle->principal);
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free(handle);
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return (ret);
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}
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}
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if (cred_usage == GSS_C_ACCEPT || cred_usage == GSS_C_BOTH) {
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ret = acquire_acceptor_cred(minor_status, context,
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desired_name, time_req,
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desired_mechs, cred_usage, handle, actual_mechs, time_rec);
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if (ret != GSS_S_COMPLETE) {
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HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
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krb5_free_principal(context, handle->principal);
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free(handle);
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return (ret);
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}
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}
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ret = gss_create_empty_oid_set(minor_status, &handle->mechanisms);
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if (ret == GSS_S_COMPLETE)
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ret = gss_add_oid_set_member(minor_status, GSS_KRB5_MECHANISM,
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&handle->mechanisms);
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if (ret == GSS_S_COMPLETE)
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ret = _gsskrb5_inquire_cred(minor_status, (gss_cred_id_t)handle,
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NULL, time_rec, NULL, actual_mechs);
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if (ret != GSS_S_COMPLETE) {
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if (handle->mechanisms != NULL)
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gss_release_oid_set(NULL, &handle->mechanisms);
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HEIMDAL_MUTEX_destroy(&handle->cred_id_mutex);
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krb5_free_principal(context, handle->principal);
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free(handle);
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return (ret);
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}
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*minor_status = 0;
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if (time_rec) {
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ret = _gsskrb5_lifetime_left(minor_status,
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context,
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handle->lifetime,
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time_rec);
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if (ret)
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return ret;
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}
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handle->usage = cred_usage;
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*output_cred_handle = (gss_cred_id_t)handle;
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return (GSS_S_COMPLETE);
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}
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