diff options
Diffstat (limited to 'crypto/heimdal/lib/gssapi/spnego/compat.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/spnego/compat.c | 322 |
1 files changed, 322 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/spnego/compat.c b/crypto/heimdal/lib/gssapi/spnego/compat.c new file mode 100644 index 0000000..287f4f7 --- /dev/null +++ b/crypto/heimdal/lib/gssapi/spnego/compat.c @@ -0,0 +1,322 @@ +/* + * 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/spnego_locl.h" + +RCSID("$Id: compat.c 21866 2007-08-08 11:31:29Z lha $"); + +/* + * 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, (void *)"\x2a\x86\x48\x82\xf7\x12\x01\x02\x02"}; + +gss_OID_desc _gss_spnego_krb5_mechanism_oid_desc = + {9, (void *)"\x2a\x86\x48\x86\xf7\x12\x01\x02\x02"}; + +/* + * Allocate a SPNEGO context handle + */ +OM_uint32 _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->delegated_cred_id = GSS_C_NO_CREDENTIAL; + + 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 _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_spnego_release_cred(&minor, &ctx->delegated_cred_id); + + 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); + *context_handle = NULL; + + 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 +_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 +_gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status, + gss_name_t target_name, + OM_uint32 (*func)(gss_name_t, gss_OID), + int includeMSCompatOID, + const gssspnego_cred 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; + int i; + + mechtypelist->len = 0; + mechtypelist->val = NULL; + + if (cred_handle != NULL) { + ret = gss_inquire_cred(minor_status, + cred_handle->negotiated_cred_id, + 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; +} |
