/*-
* 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_init_sec_context.c,v 1.1 2005/12/29 14:40:20 dfr Exp $
*/
#include "mech_locl.h"
static gss_cred_id_t
_gss_mech_cred_find(gss_cred_id_t cred_handle, gss_OID mech_type)
{
struct _gss_cred *cred = (struct _gss_cred *)cred_handle;
struct _gss_mechanism_cred *mc;
if (cred == NULL)
return GSS_C_NO_CREDENTIAL;
HEIM_SLIST_FOREACH(mc, &cred->gc_mc, gmc_link) {
if (gss_oid_equal(mech_type, mc->gmc_mech_oid))
return mc->gmc_cred;
}
return GSS_C_NO_CREDENTIAL;
}
/**
* As the initiator build a context with an acceptor.
*
* Returns in the major
* - GSS_S_COMPLETE - if the context if build
* - GSS_S_CONTINUE_NEEDED - if the caller needs to continue another
* round of gss_i nit_sec_context
* - error code - any other error code
*
* @param minor_status minor status code.
*
* @param initiator_cred_handle the credential to use when building
* the context, if GSS_C_NO_CREDENTIAL is passed, the default
* credential for the mechanism will be used.
*
* @param context_handle a pointer to a context handle, will be
* returned as long as there is not an error.
*
* @param target_name the target name of acceptor, created using
* gss_import_name(). The name is can be of any name types the
* mechanism supports, check supported name types with
* gss_inquire_names_for_mech().
*
* @param input_mech_type mechanism type to use, if GSS_C_NO_OID is
* used, Kerberos (GSS_KRB5_MECHANISM) will be tried. Other
* available mechanism are listed in the @ref gssapi_mechs_intro
* section.
*
* @param req_flags flags using when building the context, see @ref
* gssapi_context_flags
*
* @param time_req time requested this context should be valid in
* seconds, common used value is GSS_C_INDEFINITE
*
* @param input_chan_bindings Channel bindings used, if not exepected
* otherwise, used GSS_C_NO_CHANNEL_BINDINGS
*
* @param input_token input token sent from the acceptor, for the
* initial packet the buffer of { NULL, 0 } should be used.
*
* @param actual_mech_type the actual mech used, MUST NOT be freed
* since it pointing to static memory.
*
* @param output_token if there is an output token, regardless of
* complete, continue_needed, or error it should be sent to the
* acceptor
*
* @param ret_flags return what flags was negotitated, caller should
* check if they are accetable. For example, if
* GSS_C_MUTUAL_FLAG was negotiated with the acceptor or not.
*
* @param time_rec amount of time this context is valid for
*
* @returns a gss_error code, see gss_display_status() about printing
* the error code.
*
* @ingroup gssapi
*/
GSSAPI_LIB_FUNCTION OM_uint32 GSSAPI_LIB_CALL
gss_init_sec_context(OM_uint32 * minor_status,
const gss_cred_id_t initiator_cred_handle,
gss_ctx_id_t * context_handle,
const gss_name_t target_name,
const gss_OID input_mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
const gss_channel_bindings_t input_chan_bindings,
const gss_buffer_t input_token,
gss_OID * actual_mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec)
{
OM_uint32 major_status;
gssapi_mech_interface m;
struct _gss_name *name = (struct _gss_name *) target_name;
struct _gss_mechanism_name *mn;
struct _gss_context *ctx = (struct _gss_context *) *context_handle;
gss_cred_id_t cred_handle;
int allocated_ctx;
gss_OID mech_type = input_mech_type;
*minor_status = 0;
_mg_buffer_zero(output_token);
if (actual_mech_type)
*actual_mech_type = GSS_C_NO_OID;
if (ret_flags)
*ret_flags = 0;
if (time_rec)
*time_rec = 0;
/*
* If we haven't allocated a context yet, do so now and lookup
* the mechanism switch table. If we have one already, make
* sure we use the same mechanism switch as before.
*/
if (!ctx) {
if (mech_type == NULL)
mech_type = GSS_KRB5_MECHANISM;
ctx = malloc(sizeof(struct _gss_context));
if (!ctx) {
*minor_status = ENOMEM;
return (GSS_S_FAILURE);
}
memset(ctx, 0, sizeof(struct _gss_context));
m = ctx->gc_mech = __gss_get_mechanism(mech_type);
if (!m) {
free(ctx);
return (GSS_S_BAD_MECH);
}
allocated_ctx = 1;
} else {
m = ctx->gc_mech;
mech_type = &ctx->gc_mech->gm_mech_oid;
allocated_ctx = 0;
}
/*
* Find the MN for this mechanism.
*/
major_status = _gss_find_mn(minor_status, name, mech_type, &mn);
if (major_status != GSS_S_COMPLETE) {
if (allocated_ctx)
free(ctx);
return major_status;
}
/*
* If we have a cred, find the cred for this mechanism.
*/
if (m->gm_flags & GM_USE_MG_CRED)
cred_handle = initiator_cred_handle;
else
cred_handle = _gss_mech_cred_find(initiator_cred_handle, mech_type);
major_status = m->gm_init_sec_context(minor_status,
cred_handle,
&ctx->gc_ctx,
mn->gmn_name,
mech_type,
req_flags,
time_req,
input_chan_bindings,
input_token,
actual_mech_type,
output_token,
ret_flags,
time_rec);
if (major_status != GSS_S_COMPLETE
&& major_status != GSS_S_CONTINUE_NEEDED) {
if (allocated_ctx)
free(ctx);
_mg_buffer_zero(output_token);
_gss_mg_error(m, major_status, *minor_status);
} else {
*context_handle = (gss_ctx_id_t) ctx;
}
return (major_status);
}