ca052eadd5
Delegated or other explicit credentials were mishandled, the code only
worked correctly when processing default credentials. In particular
this caused root's default credential cache to be accessed when accepting
delegated credentials in SSH:
ssh_gssapi_accept_ctx() ->
ssh_gssapi_getclient() ->
gss_inquire_cred_by_mech()
When /tmp/krb5cc_0 contained expired tickets, cascaded credentials
stopped working for non-root users!
224 lines
8.5 KiB
C
224 lines
8.5 KiB
C
/*
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* Copyright (c) 1997, 2003 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 "gsskrb5_locl.h"
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OM_uint32 GSSAPI_CALLCONV _gsskrb5_inquire_cred
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(OM_uint32 * minor_status,
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gss_const_cred_id_t cred_handle,
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gss_name_t * output_name,
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OM_uint32 * lifetime,
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gss_cred_usage_t * cred_usage,
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gss_OID_set * mechanisms
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)
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{
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krb5_context context;
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gss_cred_id_t aqcred_init = GSS_C_NO_CREDENTIAL;
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gss_cred_id_t aqcred_accept = GSS_C_NO_CREDENTIAL;
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gsskrb5_cred cred = (gsskrb5_cred)cred_handle;
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gss_OID_set amechs = GSS_C_NO_OID_SET;
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gss_OID_set imechs = GSS_C_NO_OID_SET;
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OM_uint32 junk;
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OM_uint32 aminor;
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OM_uint32 ret;
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OM_uint32 aret;
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OM_uint32 alife = GSS_C_INDEFINITE;
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OM_uint32 ilife = GSS_C_INDEFINITE;
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/*
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* XXX This function is more complex than it has to be. It should call
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* _gsskrb5_inquire_cred_by_mech() twice and merge the results in the
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* cred_handle == GSS_C_NO_CREDENTIAL case, but since
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* _gsskrb5_inquire_cred_by_mech() is implemented in terms of this
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* function, first we must fix _gsskrb5_inquire_cred_by_mech().
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*/
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*minor_status = 0;
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if (output_name)
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*output_name = GSS_C_NO_NAME;
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if (cred_usage)
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*cred_usage = GSS_C_BOTH; /* There's no NONE */
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if (mechanisms)
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*mechanisms = GSS_C_NO_OID_SET;
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GSSAPI_KRB5_INIT (&context);
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if (cred_handle == GSS_C_NO_CREDENTIAL) {
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/*
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* From here to the end of this if we should refactor into a separate
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* function.
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*/
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/* Get the info for the default ACCEPT credential */
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aret = _gsskrb5_acquire_cred(&aminor,
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GSS_C_NO_NAME,
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GSS_C_INDEFINITE,
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GSS_C_NO_OID_SET,
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GSS_C_ACCEPT,
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&aqcred_accept,
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NULL,
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NULL);
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if (aret == GSS_S_COMPLETE) {
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aret = _gsskrb5_inquire_cred(&aminor,
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aqcred_accept,
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output_name,
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&alife,
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NULL,
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&amechs);
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(void) _gsskrb5_release_cred(&junk, &aqcred_accept);
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if (aret == GSS_S_COMPLETE) {
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output_name = NULL; /* Can't merge names; output only one */
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if (cred_usage)
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*cred_usage = GSS_C_ACCEPT;
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if (lifetime)
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*lifetime = alife;
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if (mechanisms) {
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*mechanisms = amechs;
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amechs = GSS_C_NO_OID_SET;
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}
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(void) gss_release_oid_set(&junk, &amechs);
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} else if (aret != GSS_S_NO_CRED) {
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*minor_status = aminor;
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return aret;
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} else {
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alife = GSS_C_INDEFINITE;
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}
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}
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/* Get the info for the default INITIATE credential */
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ret = _gsskrb5_acquire_cred(minor_status,
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GSS_C_NO_NAME,
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GSS_C_INDEFINITE,
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GSS_C_NO_OID_SET,
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GSS_C_INITIATE,
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&aqcred_init,
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NULL,
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NULL);
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if (ret == GSS_S_COMPLETE) {
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ret = _gsskrb5_inquire_cred(minor_status,
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aqcred_init,
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output_name,
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&ilife,
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NULL,
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&imechs);
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(void) _gsskrb5_release_cred(&junk, &aqcred_init);
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if (ret == GSS_S_COMPLETE) {
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/*
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* Merge results for INITIATE with ACCEPT if we had ACCEPT and
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* for those outputs that are desired.
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*/
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if (cred_usage) {
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*cred_usage = (*cred_usage == GSS_C_ACCEPT) ?
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GSS_C_BOTH : GSS_C_INITIATE;
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}
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if (lifetime)
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*lifetime = min(alife, ilife);
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if (mechanisms) {
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/*
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* This is just one mechanism (IAKERB and such would live
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* elsewhere). imechs will be equal to amechs, though not
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* ==.
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*/
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if (aret != GSS_S_COMPLETE) {
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*mechanisms = imechs;
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imechs = GSS_C_NO_OID_SET;
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}
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}
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(void) gss_release_oid_set(&junk, &amechs);
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} else if (ret != GSS_S_NO_CRED) {
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*minor_status = aminor;
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return aret;
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}
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}
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if (aret != GSS_S_COMPLETE && ret != GSS_S_COMPLETE) {
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*minor_status = aminor;
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return aret;
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}
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*minor_status = 0; /* Even though 0 is not specified to be special */
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return GSS_S_COMPLETE;
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}
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HEIMDAL_MUTEX_lock(&cred->cred_id_mutex);
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if (output_name != NULL) {
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if (cred->principal != NULL) {
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gss_name_t name = (gss_name_t)cred->principal;
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ret = _gsskrb5_duplicate_name(minor_status, name, output_name);
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if (ret)
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goto out;
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} else if (cred->usage == GSS_C_ACCEPT) {
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/*
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* Keytab case, princ may not be set (yet, ever, whatever).
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*
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* We used to unconditionally output the krb5_sname_to_principal()
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* of the host service for the hostname, but we didn't know if we
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* had keytab entries for it, so it was incorrect. We can't be
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* breaking anything in tree by outputting GSS_C_NO_NAME, but we
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* might be breaking other callers.
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*/
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*output_name = GSS_C_NO_NAME;
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} else {
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/* This shouldn't happen */
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*minor_status = KRB5_NOCREDS_SUPPLIED; /* XXX */
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ret = GSS_S_NO_CRED;
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goto out;
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}
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}
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if (lifetime != NULL) {
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ret = _gsskrb5_lifetime_left(minor_status,
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context,
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cred->lifetime,
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lifetime);
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if (ret)
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goto out;
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}
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if (cred_usage != NULL)
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*cred_usage = cred->usage;
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if (mechanisms != NULL) {
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ret = gss_create_empty_oid_set(minor_status, mechanisms);
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if (ret)
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goto out;
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ret = gss_add_oid_set_member(minor_status,
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&cred->mechanisms->elements[0],
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mechanisms);
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if (ret)
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goto out;
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}
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ret = GSS_S_COMPLETE;
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out:
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HEIMDAL_MUTEX_unlock(&cred->cred_id_mutex);
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return ret;
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}
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