3a6229f64a
Microsoft will sometimes split GSS tokens when they exceed a certain size in some protocols. This is specified in [MS-SPNG]: Simple and Protected GSS-API Negotiation Mechanism (SPNEGO) Extension https://winprotocoldoc.blob.core.windows.net/productionwindowsarchives/MS-SPNG/%5bMS-SPNG%5d.pdf sections 3.1.5.4 to 3.1.5.9. We extend gss_accept_sec_context() to recognise partial tokens and to accumulate the fragments until an entire token is available to be processed. If the entire token is not yet available, GSS_S_CONTINUE_NEEDED is returned with a zero length output token. This is specified in RFC2744 page 25-26 to indicate that no reply need be sent. We include updates to the test framework to test split tokens when using SPNEGO.
132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
/*-
|
|
* Copyright (c) 2005 Doug Rabson
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*
|
|
* $FreeBSD: src/lib/libgssapi/gss_import_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
|
|
*/
|
|
|
|
#include "mech_locl.h"
|
|
|
|
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
|
|
gss_import_sec_context(OM_uint32 *minor_status,
|
|
const gss_buffer_t interprocess_token,
|
|
gss_ctx_id_t *context_handle)
|
|
{
|
|
OM_uint32 ret = GSS_S_FAILURE;
|
|
krb5_storage *sp;
|
|
krb5_data data;
|
|
gssapi_mech_interface m;
|
|
struct _gss_context *ctx = NULL;
|
|
gss_OID_desc mech_oid;
|
|
gss_buffer_desc buf;
|
|
unsigned char verflags;
|
|
|
|
_gss_mg_log(10, "gss-isc called");
|
|
|
|
if (!minor_status || !context_handle) {
|
|
*minor_status = EFAULT;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
*minor_status = 0;
|
|
*context_handle = GSS_C_NO_CONTEXT;
|
|
|
|
sp = krb5_storage_from_mem(interprocess_token->value,
|
|
interprocess_token->length);
|
|
if (!sp) {
|
|
*minor_status = ENOMEM;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
krb5_storage_set_byteorder(sp, KRB5_STORAGE_BYTEORDER_PACKED);
|
|
|
|
ctx = calloc(1, sizeof(struct _gss_context));
|
|
if (!ctx) {
|
|
*minor_status = ENOMEM;
|
|
goto failure;
|
|
}
|
|
|
|
if (krb5_ret_uint8(sp, &verflags))
|
|
goto failure;
|
|
|
|
if ((verflags & EXPORT_CONTEXT_VERSION_MASK) != 0) {
|
|
_gss_mg_log(10, "gss-isc failed, token version %d not recognised",
|
|
(int)(verflags & EXPORT_CONTEXT_VERSION_MASK));
|
|
/* We don't recognise the version */
|
|
goto failure;
|
|
}
|
|
|
|
if (verflags & EXPORT_CONTEXT_FLAG_ACCUMULATING) {
|
|
uint32_t target_len;
|
|
|
|
if (krb5_ret_uint8(sp, &ctx->gc_initial))
|
|
goto failure;
|
|
|
|
if (krb5_ret_uint32(sp, &target_len))
|
|
goto failure;
|
|
|
|
if (krb5_ret_data(sp, &data))
|
|
goto failure;
|
|
|
|
ctx->gc_target_len = target_len;
|
|
ctx->gc_input.value = data.data;
|
|
ctx->gc_input.length = data.length;
|
|
/* Don't need to free data because we gave it to gc_input */
|
|
}
|
|
|
|
if (verflags & EXPORT_CONTEXT_FLAG_MECH_CTX) {
|
|
if (krb5_ret_data(sp, &data))
|
|
goto failure;
|
|
|
|
mech_oid.length = data.length;
|
|
mech_oid.elements = data.data;
|
|
m = __gss_get_mechanism(&mech_oid);
|
|
krb5_data_free(&data);
|
|
if (!m)
|
|
return GSS_S_DEFECTIVE_TOKEN;
|
|
ctx->gc_mech = m;
|
|
|
|
if (krb5_ret_data(sp, &data))
|
|
goto failure;
|
|
|
|
buf.length = data.length;
|
|
buf.value = data.data;
|
|
|
|
ret = m->gm_import_sec_context(minor_status, &buf, &ctx->gc_ctx);
|
|
if (ret != GSS_S_COMPLETE) {
|
|
_gss_mg_error(m, *minor_status);
|
|
free(ctx);
|
|
} else {
|
|
*context_handle = (gss_ctx_id_t) ctx;
|
|
}
|
|
}
|
|
|
|
krb5_storage_free(sp);
|
|
return (ret);
|
|
|
|
failure:
|
|
free(ctx);
|
|
krb5_storage_free(sp);
|
|
return ret;
|
|
}
|