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|
/*
* Copyright 1999-2006 University of Chicago
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef GLOBUS_DONT_DOCUMENT_INTERNAL
/**
* @file accept_sec_context.h
* Globus GSI GSS-API gss_accept_sec_context
* @author Sam Meder, Sam Lang
*
* $RCSfile: accept_sec_context.c,v $
* $Revision: 1.35 $
* $Date: 2009/02/25 14:51:01 $
*/
#endif
static char * rcsid = "$Id: accept_sec_context.c,v 1.35 2009/02/25 14:51:01 bester Exp $";
#include "gssapi_openssl.h"
#include "globus_i_gsi_gss_utils.h"
#include <string.h>
/**
* @name GSS Accept Security Context
* @ingroup globus_gsi_gssapi
*/
/* @{ */
/**
*
* @param minor_status
* @param context_handle_P
* @param acceptor_cred_handle
* @param input_token
* @param input_chan_bindings
* @param src_name_P
* @param mech_type
* @param output_token
* @param ret_flags
* Also used as req_flags for other functions
* @param time_rec
* @param delegated_cred_handle_P
*
* @return
*/
OM_uint32
GSS_CALLCONV gss_accept_sec_context(
OM_uint32 * minor_status,
gss_ctx_id_t * context_handle_P,
const gss_cred_id_t acceptor_cred_handle,
const gss_buffer_t input_token,
const gss_channel_bindings_t input_chan_bindings,
gss_name_t * src_name_P,
gss_OID * mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec,
gss_cred_id_t * delegated_cred_handle_P)
{
gss_ctx_id_desc * context = NULL;
globus_gsi_cred_handle_t delegated_cred = NULL;
OM_uint32 major_status = GSS_S_COMPLETE;
OM_uint32 local_minor_status;
OM_uint32 local_major_status;
globus_result_t local_result;
OM_uint32 nreq_flags = 0;
char dbuf[1];
STACK_OF(X509) * cert_chain = NULL;
globus_gsi_cert_utils_cert_type_t cert_type;
int readlen;
X509 * peer_cert;
const EVP_MD * peer_digest;
static char * _function_name_ =
"gss_accept_sec_context";
GLOBUS_I_GSI_GSSAPI_DEBUG_ENTER;
*minor_status = (OM_uint32) GLOBUS_SUCCESS;
output_token->length = 0;
if(!context_handle_P)
{
GLOBUS_GSI_GSSAPI_ERROR_RESULT(
minor_status,
GLOBUS_GSI_GSSAPI_ERROR_BAD_ARGUMENT,
(_GGSL("Parameter context_handle_P passed to function: %s is NULL"),
_function_name_));
major_status = GSS_S_FAILURE;
goto exit;
}
context = *context_handle_P;
/* module activation if not already done by calling
* globus_module_activate
*/
globus_thread_once(
&once_control,
globus_l_gsi_gssapi_activate_once);
globus_mutex_lock(&globus_i_gssapi_activate_mutex);
if (!globus_i_gssapi_active)
{
globus_module_activate(GLOBUS_GSI_GSSAPI_MODULE);
}
globus_mutex_unlock(&globus_i_gssapi_activate_mutex);
if (context == (gss_ctx_id_t) GSS_C_NO_CONTEXT ||
!(context->ctx_flags & GSS_I_CTX_INITIALIZED))
{
/* accept does not have req_flags, so we will use ret_flags */
if (ret_flags)
{
nreq_flags = *ret_flags;
}
major_status = globus_i_gsi_gss_create_and_fill_context(
& local_minor_status,
& context,
acceptor_cred_handle,
GSS_C_ACCEPT,
nreq_flags);
if (GSS_ERROR(major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status,
local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSS_CONTEXT);
goto exit;
}
*context_handle_P = context;
if (mech_type != NULL)
{
*mech_type = (gss_OID) gss_mech_globus_gssapi_openssl;
}
if (ret_flags != NULL)
{
/* accept does not have req_flags, we need one */
*ret_flags = 0 ;
}
if (delegated_cred_handle_P != NULL)
{
*delegated_cred_handle_P = GSS_C_NO_CREDENTIAL;
}
} /* end of first time */
/* put token data onto the SSL bio so it can be read */
major_status = globus_i_gsi_gss_put_token(&local_minor_status,
context, NULL, input_token);
if (GSS_ERROR(major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_TOKEN_FAIL);
goto exit;
}
switch (context->gss_state)
{
case(GSS_CON_ST_HANDSHAKE):
major_status = globus_i_gsi_gss_handshake(&local_minor_status,
context);
if (major_status == GSS_S_CONTINUE_NEEDED)
{
break;
}
if (GSS_ERROR(major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_HANDSHAKE);
context->gss_state = GSS_CON_ST_DONE;
break;
}
major_status = globus_i_gsi_gss_retrieve_peer(&local_minor_status,
context,
GSS_C_ACCEPT);
if (GSS_ERROR(major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_BAD_NAME);
context->gss_state = GSS_CON_ST_DONE;
break;
}
if(g_OID_equal(context->peer_cred_handle->globusid->name_oid,
GSS_C_NT_ANONYMOUS))
{
context->ret_flags |= GSS_C_ANON_FLAG;
}
if (src_name_P != NULL)
{
major_status = globus_i_gsi_gss_copy_name_to_name(
&local_minor_status,
(gss_name_desc **)src_name_P,
context->peer_cred_handle->globusid);
if(GSS_ERROR(major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_BAD_NAME);
context->gss_state = GSS_CON_ST_DONE;
break;
}
if(context->ret_flags & GSS_C_ANON_FLAG)
{
((gss_name_desc *)(*src_name_P))->name_oid
= GSS_C_NT_ANONYMOUS;
}
}
local_result = globus_gsi_callback_get_cert_type(
context->callback_data,
&cert_type);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_CALLBACK_DATA);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
if(GLOBUS_GSI_CERT_UTILS_IS_LIMITED_PROXY(cert_type))
{
context->ret_flags |= GSS_C_GLOBUS_RECEIVED_LIMITED_PROXY_FLAG;
/*
* Are we willing to accept authentication
* from a limited proxy?
* Globus gatekeepers will say no
*/
if (context->req_flags &
GSS_C_GLOBUS_DONT_ACCEPT_LIMITED_PROXY_FLAG)
{
major_status = GSS_S_UNAUTHORIZED;
GLOBUS_GSI_GSSAPI_ERROR_RESULT(
minor_status,
GLOBUS_GSI_GSSAPI_ERROR_PROXY_VIOLATION,
(_GGSL("Function set to not accept limited proxies")));
context->gss_state = GSS_CON_ST_DONE;
break;
}
}
context->ret_flags |= GSS_C_MUTUAL_FLAG;
context->ret_flags |= GSS_C_PROT_READY_FLAG;
context->ret_flags |= GSS_C_INTEG_FLAG
| GSS_C_TRANS_FLAG
| GSS_C_REPLAY_FLAG
| GSS_C_SEQUENCE_FLAG;
/*
* IF we are talking to a real SSL client,
* we dont want to do delegation, so we are done
*/
if (context->req_flags & GSS_C_GLOBUS_SSL_COMPATIBLE)
{
context->gss_state = GSS_CON_ST_DONE;
break;
}
/*
* To keep the gss exchange going, if we received
* the last token but dont have a token to send
* we need to send a null So peek at what we might send
*/
if (BIO_pending(context->gss_wbio) == 0)
{
BIO_write(context->gss_sslbio, "\0", 1);
}
context->gss_state = GSS_CON_ST_FLAGS;
break;
case(GSS_CON_ST_FLAGS):
readlen = BIO_read(context->gss_sslbio, dbuf, 1);
if (readlen != 1)
{
if (BIO_should_retry(context->gss_sslbio))
{
/*
* Handle receipt of empty fragments sent as a
* countermeasure against an SSL 3.0/TLS 1.0
* protocol vulnerability affecting CBC ciphers.
* http://www.openssl.org/~bodo/tls-cbc.txt
*/
context->gss_state = GSS_CON_ST_FLAGS;
break;
}
GLOBUS_GSI_GSSAPI_ERROR_RESULT(minor_status,
GLOBUS_GSI_GSSAPI_ERROR_WITH_DELEGATION,
(_GGSL("Delegation protocol violation: read failed")));
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
/*
* proxy_handle gets initialized in
* globus_i_gsi_gss_create_and_fill_context (called in the beginning
* of this routine. As the key_bits value of peer_credentials is
* not available before the globus_i_gsi_gss_create_and_fill_context
* call is made, it is destroyed and initialized here again with
* appropriate attribute (with the key_bits set to peer's value).
* This fixes bug 3794 (delegated credential generates 512 bit keys
* irrespective of the key strength of the peer credential),
* Couldn't remove the proxy_handle initialization in
* globus_i_gsi_gss_create_and_fill_context because the removal
* caused an error 'NULL proxy handle passed to function:
* globus_gsi_proxy_inquire_req' in the delegation tests in
* gssapi/test. Also, the key_bits attr on the proxy_handle can not
* be set by globus_gsi_proxy_handle_attrs_set_keybits(context->
* proxy_handle->attrs, key_bits) as context->proxy_handle->attrs is
* private and can not be accessed directly. context->proxy_handle
* is used here and in 'case(GSS_CON_ST_CERT):'. The control will go
* to 'case(GSS_CON_ST_CERT):' only if the proxy is created
* successfully here. So it makes sense to initialize the proxy
* here.
*/
if (*dbuf == 'D')
{
globus_gsi_proxy_handle_attrs_t proxy_handle_attrs;
int key_bits;
local_result = globus_gsi_cred_get_key_bits(
context->peer_cred_handle->cred_handle, &key_bits);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_CREDENTIAL);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_proxy_handle_attrs_init(
&proxy_handle_attrs);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_PROXY);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_proxy_handle_attrs_set_keybits(
proxy_handle_attrs, key_bits);
if(local_result != GLOBUS_SUCCESS)
{
globus_gsi_proxy_handle_attrs_destroy(proxy_handle_attrs);
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_PROXY);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_cred_get_cert(
context->peer_cred_handle->cred_handle,
&peer_cert);
if (local_result != GLOBUS_SUCCESS)
{
globus_gsi_proxy_handle_attrs_destroy(proxy_handle_attrs);
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_DELEGATION);
major_status = GSS_S_FAILURE;
break;
}
peer_digest = EVP_get_digestbynid(
OBJ_obj2nid(peer_cert->sig_alg->algorithm));
local_result = globus_gsi_proxy_handle_attrs_set_signing_algorithm(
proxy_handle_attrs, (EVP_MD *) peer_digest);
if (local_result != GLOBUS_SUCCESS)
{
globus_gsi_proxy_handle_attrs_destroy(proxy_handle_attrs);
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_DELEGATION);
major_status = GSS_S_FAILURE;
break;
}
if(context->proxy_handle)
{
globus_gsi_proxy_handle_destroy(context->proxy_handle);
}
local_result = globus_gsi_proxy_handle_init(
&context->proxy_handle, proxy_handle_attrs);
if(local_result != GLOBUS_SUCCESS)
{
globus_gsi_proxy_handle_attrs_destroy(proxy_handle_attrs);
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_PROXY);
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_proxy_handle_attrs_destroy(
proxy_handle_attrs);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_PROXY);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_proxy_create_req(
context->proxy_handle, context->gss_sslbio);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_PROXY);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
context->gss_state = GSS_CON_ST_CERT;
}
else if(*dbuf != '0')
{
GLOBUS_GSI_GSSAPI_ERROR_RESULT(minor_status,
GLOBUS_GSI_GSSAPI_ERROR_WITH_DELEGATION,
(_GGSL("Delegation protocol violation")));
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
}
else
{
context->gss_state = GSS_CON_ST_DONE;
}
break;
case(GSS_CON_ST_CERT):
local_result = globus_gsi_proxy_assemble_cred(
context->proxy_handle,
&delegated_cred,
context->gss_sslbio);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_PROXY);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_callback_get_cert_chain(
context->callback_data,
&cert_chain);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_CALLBACK_DATA);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
local_result = globus_gsi_cred_set_cert_chain(
delegated_cred,
cert_chain);
sk_X509_pop_free(cert_chain, X509_free);
if(local_result != GLOBUS_SUCCESS)
{
globus_gsi_cred_handle_destroy(delegated_cred);
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSI_CREDENTIAL);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
if(delegated_cred_handle_P)
{
major_status = globus_i_gsi_gss_create_cred(
&local_minor_status,
GSS_C_BOTH,
delegated_cred_handle_P,
&delegated_cred);
if(GSS_ERROR(major_status))
{
globus_gsi_cred_handle_destroy(delegated_cred);
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_WITH_DELEGATION);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
}
else
{
local_result = globus_gsi_cred_handle_destroy(delegated_cred);
if(local_result != GLOBUS_SUCCESS)
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_result,
GLOBUS_GSI_GSSAPI_ERROR_WITH_DELEGATION);
context->gss_state = GSS_CON_ST_DONE;
major_status = GSS_S_FAILURE;
break;
}
}
context->ret_flags |= GSS_C_DELEG_FLAG;
context->gss_state = GSS_CON_ST_DONE;
default:
break;
} /* end of switch for gss_con_st */
/* We want to go ahead and get an ouput token even if we previously
* encountered an error since the output token may contain information
* about the error (i.e. an SSL alert message) we want to send to the other
* side.
*/
local_major_status = globus_i_gsi_gss_get_token(
&local_minor_status,
context, NULL, output_token);
if(GSS_ERROR(local_major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_TOKEN_FAIL);
major_status = local_major_status;
goto exit;
}
if(GSS_ERROR(major_status))
{
goto exit;
}
if(context->gss_state != GSS_CON_ST_DONE)
{
major_status |= GSS_S_CONTINUE_NEEDED;
}
else if(time_rec != NULL)
{
time_t lifetime;
time_t current_time;
major_status = globus_i_gsi_gss_get_context_goodtill(
&local_minor_status,
context,
&lifetime);
if(GSS_ERROR(major_status))
{
GLOBUS_GSI_GSSAPI_ERROR_CHAIN_RESULT(
minor_status, local_minor_status,
GLOBUS_GSI_GSSAPI_ERROR_WITH_GSS_CONTEXT);
goto exit;
}
current_time = time(NULL);
if(current_time > lifetime)
{
*time_rec = 0;
}
else
{
*time_rec = (OM_uint32) (lifetime - current_time);
}
}
if (ret_flags != NULL)
{
*ret_flags = context->ret_flags;
}
GLOBUS_I_GSI_GSSAPI_DEBUG_FPRINTF(
2, (globus_i_gsi_gssapi_debug_fstream,
"accept_sec_context:major_status:%08x"
":gss_state:%d:ret_flags=%08x\n",
(unsigned int) major_status,
context->gss_state,
(unsigned int) context->ret_flags));
exit:
GLOBUS_I_GSI_GSSAPI_DEBUG_EXIT;
return major_status;
}
/* @} */
|
