/crypto/heimdal/lib/gssapi/spnego/compat.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 317 lines · 207 code · 48 blank · 62 comment · 51 complexity · 2bfc628fb3919939d793f62eed07d6e4 MD5 · raw file
- /*
- * Copyright (c) 2004, PADL Software Pty Ltd.
- * 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 PADL Software 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 PADL SOFTWARE 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 PADL SOFTWARE 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 "spnego_locl.h"
- /*
- * Apparently Microsoft got the OID wrong, and used
- * 1.2.840.48018.1.2.2 instead. We need both this and
- * the correct Kerberos OID here in order to deal with
- * this. Because this is manifest in SPNEGO only I'd
- * prefer to deal with this here rather than inside the
- * Kerberos mechanism.
- */
- gss_OID_desc _gss_spnego_mskrb_mechanism_oid_desc =
- {9, rk_UNCONST("\x2a\x86\x48\x82\xf7\x12\x01\x02\x02")};
- gss_OID_desc _gss_spnego_krb5_mechanism_oid_desc =
- {9, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
- /*
- * Allocate a SPNEGO context handle
- */
- OM_uint32 GSSAPI_CALLCONV
- _gss_spnego_alloc_sec_context (OM_uint32 * minor_status,
- gss_ctx_id_t *context_handle)
- {
- gssspnego_ctx ctx;
- ctx = calloc(1, sizeof(*ctx));
- if (ctx == NULL) {
- *minor_status = ENOMEM;
- return GSS_S_FAILURE;
- }
- ctx->initiator_mech_types.len = 0;
- ctx->initiator_mech_types.val = NULL;
- ctx->preferred_mech_type = GSS_C_NO_OID;
- ctx->negotiated_mech_type = GSS_C_NO_OID;
- ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
- /*
- * Cache these so we can return them before returning
- * GSS_S_COMPLETE, even if the mechanism has itself
- * completed earlier
- */
- ctx->mech_flags = 0;
- ctx->mech_time_rec = 0;
- ctx->mech_src_name = GSS_C_NO_NAME;
- ctx->open = 0;
- ctx->local = 0;
- ctx->require_mic = 0;
- ctx->verified_mic = 0;
- HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
- *context_handle = (gss_ctx_id_t)ctx;
- return GSS_S_COMPLETE;
- }
- /*
- * Free a SPNEGO context handle. The caller must have acquired
- * the lock before this is called.
- */
- OM_uint32 GSSAPI_CALLCONV _gss_spnego_internal_delete_sec_context
- (OM_uint32 *minor_status,
- gss_ctx_id_t *context_handle,
- gss_buffer_t output_token
- )
- {
- gssspnego_ctx ctx;
- OM_uint32 ret, minor;
- *minor_status = 0;
- if (context_handle == NULL) {
- return GSS_S_NO_CONTEXT;
- }
- if (output_token != GSS_C_NO_BUFFER) {
- output_token->length = 0;
- output_token->value = NULL;
- }
- ctx = (gssspnego_ctx)*context_handle;
- *context_handle = GSS_C_NO_CONTEXT;
- if (ctx == NULL) {
- return GSS_S_NO_CONTEXT;
- }
- if (ctx->initiator_mech_types.val != NULL)
- free_MechTypeList(&ctx->initiator_mech_types);
- gss_release_oid(&minor, &ctx->preferred_mech_type);
- ctx->negotiated_mech_type = GSS_C_NO_OID;
- gss_release_name(&minor, &ctx->target_name);
- gss_release_name(&minor, &ctx->mech_src_name);
- if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) {
- ret = gss_delete_sec_context(minor_status,
- &ctx->negotiated_ctx_id,
- output_token);
- ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
- } else {
- ret = GSS_S_COMPLETE;
- }
- HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
- HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
- free(ctx);
- return ret;
- }
- /*
- * For compatability with the Windows SPNEGO implementation, the
- * default is to ignore the mechListMIC unless CFX is used and
- * a non-preferred mechanism was negotiated
- */
- OM_uint32 GSSAPI_CALLCONV
- _gss_spnego_require_mechlist_mic(OM_uint32 *minor_status,
- gssspnego_ctx ctx,
- int *require_mic)
- {
- gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET;
- OM_uint32 minor;
- *minor_status = 0;
- *require_mic = 0;
- if (ctx == NULL) {
- return GSS_S_COMPLETE;
- }
- if (ctx->require_mic) {
- /* Acceptor requested it: mandatory to honour */
- *require_mic = 1;
- return GSS_S_COMPLETE;
- }
- /*
- * Check whether peer indicated implicit support for updated SPNEGO
- * (eg. in the Kerberos case by using CFX)
- */
- if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id,
- GSS_C_PEER_HAS_UPDATED_SPNEGO,
- &buffer_set) == GSS_S_COMPLETE) {
- *require_mic = 1;
- gss_release_buffer_set(&minor, &buffer_set);
- }
- /* Safe-to-omit MIC rules follow */
- if (*require_mic) {
- if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) {
- *require_mic = 0;
- } else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) &&
- gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) {
- *require_mic = 0;
- }
- }
- return GSS_S_COMPLETE;
- }
- static int
- add_mech_type(gss_OID mech_type,
- int includeMSCompatOID,
- MechTypeList *mechtypelist)
- {
- MechType mech;
- int ret;
- if (gss_oid_equal(mech_type, GSS_SPNEGO_MECHANISM))
- return 0;
- if (includeMSCompatOID &&
- gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) {
- ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements,
- _gss_spnego_mskrb_mechanism_oid_desc.length,
- &mech,
- NULL);
- if (ret)
- return ret;
- ret = add_MechTypeList(mechtypelist, &mech);
- free_MechType(&mech);
- if (ret)
- return ret;
- }
- ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL);
- if (ret)
- return ret;
- ret = add_MechTypeList(mechtypelist, &mech);
- free_MechType(&mech);
- return ret;
- }
- OM_uint32 GSSAPI_CALLCONV
- _gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status,
- gss_name_t target_name,
- OM_uint32 (*func)(gss_name_t, gss_OID),
- int includeMSCompatOID,
- const gss_cred_id_t cred_handle,
- MechTypeList *mechtypelist,
- gss_OID *preferred_mech)
- {
- gss_OID_set supported_mechs = GSS_C_NO_OID_SET;
- gss_OID first_mech = GSS_C_NO_OID;
- OM_uint32 ret;
- size_t i;
- mechtypelist->len = 0;
- mechtypelist->val = NULL;
- if (cred_handle) {
- ret = gss_inquire_cred(minor_status,
- cred_handle,
- NULL,
- NULL,
- NULL,
- &supported_mechs);
- } else {
- ret = gss_indicate_mechs(minor_status, &supported_mechs);
- }
- if (ret != GSS_S_COMPLETE) {
- return ret;
- }
- if (supported_mechs->count == 0) {
- *minor_status = ENOENT;
- gss_release_oid_set(minor_status, &supported_mechs);
- return GSS_S_FAILURE;
- }
- ret = (*func)(target_name, GSS_KRB5_MECHANISM);
- if (ret == GSS_S_COMPLETE) {
- ret = add_mech_type(GSS_KRB5_MECHANISM,
- includeMSCompatOID,
- mechtypelist);
- if (!GSS_ERROR(ret))
- first_mech = GSS_KRB5_MECHANISM;
- }
- ret = GSS_S_COMPLETE;
- for (i = 0; i < supported_mechs->count; i++) {
- OM_uint32 subret;
- if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM))
- continue;
- if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM))
- continue;
- subret = (*func)(target_name, &supported_mechs->elements[i]);
- if (subret != GSS_S_COMPLETE)
- continue;
- ret = add_mech_type(&supported_mechs->elements[i],
- includeMSCompatOID,
- mechtypelist);
- if (ret != 0) {
- *minor_status = ret;
- ret = GSS_S_FAILURE;
- break;
- }
- if (first_mech == GSS_C_NO_OID)
- first_mech = &supported_mechs->elements[i];
- }
- if (mechtypelist->len == 0) {
- gss_release_oid_set(minor_status, &supported_mechs);
- *minor_status = 0;
- return GSS_S_BAD_MECH;
- }
- if (preferred_mech != NULL) {
- ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech);
- if (ret != GSS_S_COMPLETE)
- free_MechTypeList(mechtypelist);
- }
- gss_release_oid_set(minor_status, &supported_mechs);
- return ret;
- }