gssapi: credential store extensions (#451)
Implement the GSS-API credential store API extensions defined by MIT here: https://k5wiki.kerberos.org/wiki/Projects/Credential_Store_extensions Note: we kill off gss_acquire_cred_ext() here. This was never a public API, although mechanisms could have implemented it and I briefly used it in my BrowserID prototype mechanism. gss_acquire_cred_ext_from() occupies the place in the dispatch table where gss_acquire_cred_ext() used to, but this structure was never visible outside Heimdal (i.e. it is only used by internal mechanisms); (Mechanisms that need to accept arbitrary key/value dictionaries from applications should now implement gss_acquire_cred_from().)
This commit is contained in:
Luke Howard
committed by
Nico Williams
Nico Williams
parent
a7d42cdf6b
commit
e0bb9c10ca
265
lib/gssapi/mech/gss_acquire_cred_from.c
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265
lib/gssapi/mech/gss_acquire_cred_from.c
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/*-
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* Copyright (c) 2005 Doug Rabson
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* All rights reserved.
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*
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* Portions Copyright (c) 2011, 2018 PADL Software Pty Ltd.
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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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* 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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* 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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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* $FreeBSD: src/lib/libgssapi/gss_acquire_cred.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
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*/
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#include "mech_locl.h"
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/*
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* Shim for gss_acquire_cred_with_password()
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*/
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static const char *
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find_password_in_cred_store(gss_const_key_value_set_t cred_store)
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{
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size_t i;
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if (cred_store == GSS_C_NO_CRED_STORE)
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return NULL;
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for (i = 0; i < cred_store->count; i++) {
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if (strcmp(cred_store->elements[i].key, "password") == 0)
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return cred_store->elements[i].value;
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}
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return NULL;
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}
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static OM_uint32
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acquire_mech_cred(OM_uint32 *minor_status,
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gssapi_mech_interface m,
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const struct _gss_mechanism_name *mn,
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OM_uint32 time_req,
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gss_cred_usage_t cred_usage,
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gss_const_key_value_set_t cred_store,
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struct _gss_mechanism_cred **out,
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OM_uint32 *time_rec)
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{
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OM_uint32 major_status;
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struct _gss_mechanism_cred *mc;
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gss_OID_set_desc mech;
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const char *spassword;
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*out = NULL;
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if (time_rec)
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*time_rec = 0;
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mc = calloc(1, sizeof(struct _gss_mechanism_cred));
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if (mc == NULL) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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mc->gmc_mech = m;
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mc->gmc_mech_oid = &m->gm_mech_oid;
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mech.count = 1;
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mech.elements = mc->gmc_mech_oid;
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if (m->gm_acquire_cred_from) {
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major_status = m->gm_acquire_cred_from(minor_status,
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mn ? mn->gmn_name : GSS_C_NO_NAME,
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time_req,
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&mech,
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cred_usage,
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cred_store,
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&mc->gmc_cred,
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NULL,
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time_rec);
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} else if (cred_store == GSS_C_NO_CRED_STORE && m->gm_acquire_cred) {
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major_status = m->gm_acquire_cred(minor_status,
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mn ? mn->gmn_name : GSS_C_NO_NAME,
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time_req,
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&mech,
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cred_usage,
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&mc->gmc_cred,
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NULL,
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time_rec);
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} else if (m->gm_compat &&
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m->gm_compat->gmc_acquire_cred_with_password &&
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(spassword = find_password_in_cred_store(cred_store)) != NULL) {
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gss_buffer_desc password;
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password.length = strlen(spassword);
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password.value = rk_UNCONST(spassword);
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/* compat glue for loadable mechanisms that implement API-as-SPI */
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major_status = m->gm_compat->gmc_acquire_cred_with_password(minor_status,
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mn ? mn->gmn_name : GSS_C_NO_NAME,
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&password,
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time_req,
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&mech,
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cred_usage,
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&mc->gmc_cred,
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NULL,
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time_rec);
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} else
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major_status = GSS_S_UNAVAILABLE;
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heim_assert(major_status == GSS_S_COMPLETE || mc->gmc_cred == NULL,
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"gss_acquire_cred_from: mech succeeded but did not return a credential");
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if (major_status == GSS_S_COMPLETE)
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*out = mc;
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else
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free(mc);
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return major_status;
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}
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OM_uint32
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gss_acquire_cred_from(OM_uint32 *minor_status,
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gss_const_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_const_key_value_set_t cred_store,
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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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OM_uint32 major_status, minor;
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struct _gss_name *name = (struct _gss_name *)desired_name;
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gssapi_mech_interface m;
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struct _gss_cred *cred = NULL;
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size_t i;
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OM_uint32 min_time = GSS_C_INDEFINITE;
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gss_OID_set mechs;
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*minor_status = 0;
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if (output_cred_handle == NULL)
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return GSS_S_CALL_INACCESSIBLE_READ;
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*output_cred_handle = GSS_C_NO_CREDENTIAL;
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if (actual_mechs)
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*actual_mechs = GSS_C_NO_OID_SET;
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if (time_rec)
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*time_rec = 0;
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_gss_load_mech();
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if (desired_mechs) {
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int match = 0;
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for (i = 0; i < desired_mechs->count; i++) {
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gss_test_oid_set_member(minor_status, &desired_mechs->elements[i],
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_gss_mech_oids, &match);
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if (match)
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break;
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}
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if (!match) {
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*minor_status = 0;
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major_status = GSS_S_BAD_MECH;
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goto cleanup;
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}
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mechs = desired_mechs;
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} else
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mechs = _gss_mech_oids;
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cred = calloc(1, sizeof(*cred));
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if (cred == NULL) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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HEIM_SLIST_INIT(&cred->gc_mc);
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if (actual_mechs) {
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major_status = gss_create_empty_oid_set(minor_status, actual_mechs);
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if (GSS_ERROR(major_status))
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goto cleanup;
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}
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major_status = GSS_S_UNAVAILABLE; /* in case of no mechs */
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for (i = 0; i < mechs->count; i++) {
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struct _gss_mechanism_name *mn = NULL;
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struct _gss_mechanism_cred *mc = NULL;
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OM_uint32 cred_time;
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m = __gss_get_mechanism(&mechs->elements[i]);
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if (m == NULL)
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continue;
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if (desired_name != GSS_C_NO_NAME) {
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major_status = _gss_find_mn(minor_status, name,
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&mechs->elements[i], &mn);
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if (major_status != GSS_S_COMPLETE)
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continue;
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}
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major_status = acquire_mech_cred(minor_status, m, mn,
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time_req, cred_usage,
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cred_store, &mc, &cred_time);
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if (major_status != GSS_S_COMPLETE) {
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if (mechs->count == 1)
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_gss_mg_error(m, major_status, *minor_status);
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continue;
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}
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HEIM_SLIST_INSERT_HEAD(&cred->gc_mc, mc, gmc_link);
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if (cred_time < min_time)
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min_time = cred_time;
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if (actual_mechs != NULL) {
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major_status = gss_add_oid_set_member(minor_status,
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mc->gmc_mech_oid,
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actual_mechs);
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if (GSS_ERROR(major_status))
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goto cleanup;
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}
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}
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/*
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* If we didn't manage to create a single credential, return
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* an error.
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*/
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if (!HEIM_SLIST_FIRST(&cred->gc_mc)) {
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if (mechs->count > 1) {
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*minor_status = 0;
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major_status = GSS_S_NO_CRED;
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}
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heim_assert(major_status != GSS_S_COMPLETE,
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"lack of credentials must result in an error");
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goto cleanup;
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}
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*minor_status = 0;
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major_status = GSS_S_COMPLETE;
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*output_cred_handle = (gss_cred_id_t)cred;
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if (time_rec)
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*time_rec = min_time;
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cleanup:
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if (major_status != GSS_S_COMPLETE) {
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gss_release_cred(&minor, (gss_cred_id_t *)&cred);
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if (actual_mechs)
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gss_release_oid_set(&minor, actual_mechs);
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}
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return major_status;
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}
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