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