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|
/* -*- mode: c; indent-tabs-mode: nil -*- */
/*
* Copyright 2000, 2002, 2003, 2007, 2008 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*/
/*
* Copyright 1993 by OpenVision Technologies, Inc.
*
* Permission to use, copy, modify, distribute, and sell this software
* and its documentation for any purpose is hereby granted without fee,
* provided that the above copyright notice appears in all copies and
* that both that copyright notice and this permission notice appear in
* supporting documentation, and that the name of OpenVision not be used
* in advertising or publicity pertaining to distribution of the software
* without specific, written prior permission. OpenVision makes no
* representations about the suitability of this software for any
* purpose. It is provided "as is" without express or implied warranty.
*
* OPENVISION DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
* EVENT SHALL OPENVISION BE LIABLE FOR ANY SPECIAL, INDIRECT OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF
* USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
* PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Copyright (C) 1998 by the FundsXpress, INC.
*
* All rights reserved.
*
* Export of this software from the United States of America may require
* a specific license from the United States Government. It is the
* responsibility of any person or organization contemplating export to
* obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of FundsXpress. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. FundsXpress makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "k5-int.h"
#include "gssapiP_krb5.h"
#ifdef HAVE_MEMORY_H
#include <memory.h>
#endif
#include <stdlib.h>
#include <assert.h>
/*
* $Id$
*/
/* XXX This is for debugging only!!! Should become a real bitfield
at some point */
int krb5_gss_dbg_client_expcreds = 0;
/*
* Common code which fetches the correct krb5 credentials from the
* ccache.
*/
static krb5_error_code get_credentials(context, cred, server, now,
endtime, out_creds)
krb5_context context;
krb5_gss_cred_id_t cred;
krb5_principal server;
krb5_timestamp now;
krb5_timestamp endtime;
krb5_creds **out_creds;
{
krb5_error_code code;
krb5_creds in_creds;
k5_mutex_assert_locked(&cred->lock);
memset(&in_creds, 0, sizeof(krb5_creds));
in_creds.client = in_creds.server = NULL;
if ((code = krb5_copy_principal(context, cred->princ, &in_creds.client)))
goto cleanup;
if ((code = krb5_copy_principal(context, server, &in_creds.server)))
goto cleanup;
in_creds.times.endtime = endtime;
in_creds.keyblock.enctype = 0;
code = krb5_get_credentials(context, 0, cred->ccache,
&in_creds, out_creds);
if (code)
goto cleanup;
/*
* Enforce a stricter limit (without timeskew forgiveness at the
* boundaries) because accept_sec_context code is also similarly
* non-forgiving.
*/
if (!krb5_gss_dbg_client_expcreds && *out_creds != NULL &&
(*out_creds)->times.endtime < now) {
code = KRB5KRB_AP_ERR_TKT_EXPIRED;
goto cleanup;
}
cleanup:
if (in_creds.client)
krb5_free_principal(context, in_creds.client);
if (in_creds.server)
krb5_free_principal(context, in_creds.server);
return code;
}
struct gss_checksum_data {
krb5_gss_ctx_id_rec *ctx;
krb5_gss_cred_id_t cred;
krb5_checksum md5;
krb5_data checksum_data;
};
#ifdef CFX_EXERCISE
#include "../../krb5/krb/auth_con.h"
#endif
static krb5_error_code KRB5_CALLCONV
make_gss_checksum (krb5_context context, krb5_auth_context auth_context,
void *cksum_data, krb5_data **out)
{
krb5_error_code code;
krb5_int32 con_flags;
unsigned char *ptr;
struct gss_checksum_data *data = cksum_data;
krb5_data credmsg;
unsigned int junk;
data->checksum_data.data = 0;
credmsg.data = 0;
/* build the checksum field */
if (data->ctx->gss_flags & GSS_C_DELEG_FLAG) {
/* first get KRB_CRED message, so we know its length */
/* clear the time check flag that was set in krb5_auth_con_init() */
krb5_auth_con_getflags(context, auth_context, &con_flags);
krb5_auth_con_setflags(context, auth_context,
con_flags & ~KRB5_AUTH_CONTEXT_DO_TIME);
code = krb5_fwd_tgt_creds(context, auth_context, 0,
data->cred->princ, data->ctx->there,
data->cred->ccache, 1,
&credmsg);
/* turn KRB5_AUTH_CONTEXT_DO_TIME back on */
krb5_auth_con_setflags(context, auth_context, con_flags);
if (code) {
/* don't fail here; just don't accept/do the delegation
request */
data->ctx->gss_flags &= ~(GSS_C_DELEG_FLAG |
GSS_C_DELEG_POLICY_FLAG);
data->checksum_data.length = 24;
} else {
if (credmsg.length+28 > KRB5_INT16_MAX) {
krb5_free_data_contents(context, &credmsg);
return(KRB5KRB_ERR_FIELD_TOOLONG);
}
data->checksum_data.length = 28+credmsg.length;
}
} else {
data->checksum_data.length = 24;
}
#ifdef CFX_EXERCISE
if (data->ctx->auth_context->keyblock != NULL
&& data->ctx->auth_context->keyblock->enctype == 18) {
srand(time(0) ^ getpid());
/* Our ftp client code stupidly assumes a base64-encoded
version of the token will fit in 10K, so don't make this
too big. */
junk = rand() & 0xff;
} else
junk = 0;
#else
junk = 0;
#endif
data->checksum_data.length += junk;
/* now allocate a buffer to hold the checksum data and
(maybe) KRB_CRED msg */
if ((data->checksum_data.data =
(char *) xmalloc(data->checksum_data.length)) == NULL) {
if (credmsg.data)
krb5_free_data_contents(context, &credmsg);
return(ENOMEM);
}
ptr = (unsigned char *)data->checksum_data.data;
TWRITE_INT(ptr, data->md5.length, 0);
TWRITE_STR(ptr, data->md5.contents, data->md5.length);
TWRITE_INT(ptr, data->ctx->gss_flags, 0);
/* done with this, free it */
xfree(data->md5.contents);
if (credmsg.data) {
TWRITE_INT16(ptr, KRB5_GSS_FOR_CREDS_OPTION, 0);
TWRITE_INT16(ptr, credmsg.length, 0);
TWRITE_STR(ptr, credmsg.data, credmsg.length);
/* free credmsg data */
krb5_free_data_contents(context, &credmsg);
}
if (junk)
memset(ptr, 'i', junk);
*out = &data->checksum_data;
return 0;
}
static krb5_error_code
make_ap_req_v1(context, ctx, cred, k_cred, chan_bindings, mech_type, token)
krb5_context context;
krb5_gss_ctx_id_rec *ctx;
krb5_gss_cred_id_t cred;
krb5_creds *k_cred;
gss_channel_bindings_t chan_bindings;
gss_OID mech_type;
gss_buffer_t token;
{
krb5_flags mk_req_flags = 0;
krb5_error_code code;
struct gss_checksum_data cksum_struct;
krb5_checksum md5;
krb5_data ap_req;
krb5_data *checksum_data = NULL;
unsigned char *ptr;
unsigned char *t;
unsigned int tlen;
k5_mutex_assert_locked(&cred->lock);
ap_req.data = 0;
/* compute the hash of the channel bindings */
if ((code = kg_checksum_channel_bindings(context, chan_bindings, &md5, 0)))
return(code);
krb5_auth_con_set_req_cksumtype(context, ctx->auth_context,
CKSUMTYPE_KG_CB);
cksum_struct.md5 = md5;
cksum_struct.ctx = ctx;
cksum_struct.cred = cred;
cksum_struct.checksum_data.data = NULL;
switch (k_cred->keyblock.enctype) {
case ENCTYPE_DES_CBC_CRC:
case ENCTYPE_DES_CBC_MD4:
case ENCTYPE_DES_CBC_MD5:
case ENCTYPE_DES3_CBC_SHA1:
code = make_gss_checksum(context, ctx->auth_context, &cksum_struct,
&checksum_data);
if (code)
goto cleanup;
break;
default:
krb5_auth_con_set_checksum_func(context, ctx->auth_context,
make_gss_checksum, &cksum_struct);
break;
}
/* call mk_req. subkey and ap_req need to be used or destroyed */
mk_req_flags = AP_OPTS_USE_SUBKEY;
if (ctx->gss_flags & GSS_C_MUTUAL_FLAG)
mk_req_flags |= AP_OPTS_MUTUAL_REQUIRED | AP_OPTS_ETYPE_NEGOTIATION;
code = krb5_mk_req_extended(context, &ctx->auth_context, mk_req_flags,
checksum_data, k_cred, &ap_req);
krb5_free_data_contents(context, &cksum_struct.checksum_data);
if (code)
goto cleanup;
/* store the interesting stuff from creds and authent */
ctx->krb_times = k_cred->times;
ctx->krb_flags = k_cred->ticket_flags;
/* build up the token */
if (ctx->gss_flags & GSS_C_DCE_STYLE) {
/*
* For DCE RPC, do not encapsulate the AP-REQ in the
* typical GSS wrapping.
*/
token->length = ap_req.length;
token->value = ap_req.data;
ap_req.data = NULL; /* don't double free */
} else {
/* allocate space for the token */
tlen = g_token_size((gss_OID) mech_type, ap_req.length);
if ((t = (unsigned char *) xmalloc(tlen)) == NULL) {
code = ENOMEM;
goto cleanup;
}
/* fill in the buffer */
ptr = t;
g_make_token_header(mech_type, ap_req.length,
&ptr, KG_TOK_CTX_AP_REQ);
TWRITE_STR(ptr, ap_req.data, ap_req.length);
/* pass it back */
token->length = tlen;
token->value = (void *) t;
}
code = 0;
cleanup:
if (checksum_data && checksum_data->data)
krb5_free_data_contents(context, checksum_data);
if (ap_req.data)
krb5_free_data_contents(context, &ap_req);
return (code);
}
/*
* new_connection
*
* Do the grunt work of setting up a new context.
*/
static OM_uint32
new_connection(
OM_uint32 *minor_status,
krb5_gss_cred_id_t cred,
gss_ctx_id_t *context_handle,
gss_name_t target_name,
gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
gss_channel_bindings_t input_chan_bindings,
gss_buffer_t input_token,
gss_OID *actual_mech_type,
gss_buffer_t output_token,
OM_uint32 *ret_flags,
OM_uint32 *time_rec,
krb5_context context,
int default_mech)
{
OM_uint32 major_status;
krb5_error_code code;
krb5_creds *k_cred;
krb5_gss_ctx_id_rec *ctx, *ctx_free;
krb5_timestamp now;
gss_buffer_desc token;
k5_mutex_assert_locked(&cred->lock);
major_status = GSS_S_FAILURE;
token.length = 0;
token.value = NULL;
/* make sure the cred is usable for init */
if ((cred->usage != GSS_C_INITIATE) &&
(cred->usage != GSS_C_BOTH)) {
*minor_status = 0;
return(GSS_S_NO_CRED);
}
/* complain if the input token is non-null */
if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
*minor_status = 0;
return(GSS_S_DEFECTIVE_TOKEN);
}
/* create the ctx */
if ((ctx = (krb5_gss_ctx_id_rec *) xmalloc(sizeof(krb5_gss_ctx_id_rec)))
== NULL) {
*minor_status = ENOMEM;
return(GSS_S_FAILURE);
}
/* fill in the ctx */
memset(ctx, 0, sizeof(krb5_gss_ctx_id_rec));
ctx_free = ctx;
if ((code = krb5_auth_con_init(context, &ctx->auth_context)))
goto fail;
krb5_auth_con_setflags(context, ctx->auth_context,
KRB5_AUTH_CONTEXT_DO_SEQUENCE);
/* limit the encryption types negotiated (if requested) */
if (cred->req_enctypes) {
if ((code = krb5_set_default_tgs_enctypes(context,
cred->req_enctypes))) {
goto fail;
}
}
ctx->initiate = 1;
ctx->gss_flags = (GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG |
GSS_C_TRANS_FLAG |
((req_flags) & (GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG |
GSS_C_SEQUENCE_FLAG | GSS_C_DELEG_FLAG |
GSS_C_DCE_STYLE | GSS_C_IDENTIFY_FLAG |
GSS_C_EXTENDED_ERROR_FLAG)));
ctx->seed_init = 0;
ctx->big_endian = 0; /* all initiators do little-endian, as per spec */
ctx->seqstate = 0;
if (req_flags & GSS_C_DCE_STYLE)
ctx->gss_flags |= GSS_C_MUTUAL_FLAG;
if ((code = krb5_timeofday(context, &now)))
goto fail;
if (time_req == 0 || time_req == GSS_C_INDEFINITE) {
ctx->krb_times.endtime = 0;
} else {
ctx->krb_times.endtime = now + time_req;
}
if ((code = krb5_copy_principal(context, cred->princ, &ctx->here)))
goto fail;
if ((code = krb5_copy_principal(context, (krb5_principal) target_name,
&ctx->there)))
goto fail;
code = get_credentials(context, cred, ctx->there, now,
ctx->krb_times.endtime, &k_cred);
if (code)
goto fail;
ctx->krb_times = k_cred->times;
/*
* GSS_C_DELEG_POLICY_FLAG means to delegate only if the
* ok-as-delegate ticket flag is set.
*/
if ((req_flags & GSS_C_DELEG_POLICY_FLAG)
&& (k_cred->ticket_flags & TKT_FLG_OK_AS_DELEGATE))
ctx->gss_flags |= GSS_C_DELEG_FLAG | GSS_C_DELEG_POLICY_FLAG;
if (default_mech) {
mech_type = (gss_OID) gss_mech_krb5;
}
if (generic_gss_copy_oid(minor_status, mech_type, &ctx->mech_used)
!= GSS_S_COMPLETE) {
code = *minor_status;
goto fail;
}
/*
* Now try to make it static if at all possible....
*/
ctx->mech_used = krb5_gss_convert_static_mech_oid(ctx->mech_used);
{
/* gsskrb5 v1 */
krb5_int32 seq_temp;
if ((code = make_ap_req_v1(context, ctx,
cred, k_cred, input_chan_bindings,
mech_type, &token))) {
if ((code == KRB5_FCC_NOFILE) || (code == KRB5_CC_NOTFOUND) ||
(code == KG_EMPTY_CCACHE))
major_status = GSS_S_NO_CRED;
if (code == KRB5KRB_AP_ERR_TKT_EXPIRED)
major_status = GSS_S_CREDENTIALS_EXPIRED;
goto fail;
}
krb5_auth_con_getlocalseqnumber(context, ctx->auth_context, &seq_temp);
ctx->seq_send = seq_temp;
krb5_auth_con_getsendsubkey(context, ctx->auth_context,
&ctx->subkey);
}
krb5_free_creds(context, k_cred);
k_cred = NULL;
ctx->enc = NULL;
ctx->seq = NULL;
ctx->have_acceptor_subkey = 0;
code = kg_setup_keys(context, ctx, ctx->subkey, &ctx->cksumtype);
if (code != 0)
goto fail;
/* at this point, the context is constructed and valid,
hence, releaseable */
/* intern the context handle */
if (! kg_save_ctx_id((gss_ctx_id_t) ctx)) {
code = G_VALIDATE_FAILED;
goto fail;
}
*context_handle = (gss_ctx_id_t) ctx;
ctx_free = 0;
/* compute time_rec */
if (time_rec) {
if ((code = krb5_timeofday(context, &now)))
goto fail;
*time_rec = ctx->krb_times.endtime - now;
}
/* set the other returns */
*output_token = token;
if (ret_flags)
*ret_flags = ctx->gss_flags;
if (actual_mech_type)
*actual_mech_type = mech_type;
/* return successfully */
*minor_status = 0;
if (ctx->gss_flags & GSS_C_MUTUAL_FLAG) {
ctx->established = 0;
return(GSS_S_CONTINUE_NEEDED);
} else {
ctx->seq_recv = ctx->seq_send;
g_order_init(&(ctx->seqstate), ctx->seq_recv,
(ctx->gss_flags & GSS_C_REPLAY_FLAG) != 0,
(ctx->gss_flags & GSS_C_SEQUENCE_FLAG) != 0, ctx->proto);
ctx->gss_flags |= GSS_C_PROT_READY_FLAG;
ctx->established = 1;
return(GSS_S_COMPLETE);
}
fail:
if (ctx_free) {
if (ctx_free->auth_context)
krb5_auth_con_free(context, ctx_free->auth_context);
if (ctx_free->here)
krb5_free_principal(context, ctx_free->here);
if (ctx_free->there)
krb5_free_principal(context, ctx_free->there);
if (ctx_free->subkey)
krb5_free_keyblock(context, ctx_free->subkey);
xfree(ctx_free);
} else
(void)krb5_gss_delete_sec_context(minor_status, context_handle, NULL);
*minor_status = code;
return (major_status);
}
/*
* mutual_auth
*
* Handle the reply from the acceptor, if we're doing mutual auth.
*/
static OM_uint32
mutual_auth(
OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
gss_name_t target_name,
gss_OID mech_type,
OM_uint32 req_flags,
OM_uint32 time_req,
gss_channel_bindings_t input_chan_bindings,
gss_buffer_t input_token,
gss_OID *actual_mech_type,
gss_buffer_t output_token,
OM_uint32 *ret_flags,
OM_uint32 *time_rec,
krb5_context context)
{
OM_uint32 major_status;
unsigned char *ptr;
char *sptr;
krb5_data ap_rep;
krb5_ap_rep_enc_part *ap_rep_data;
krb5_timestamp now;
krb5_gss_ctx_id_rec *ctx;
krb5_error *krb_error;
krb5_error_code code;
krb5int_access kaccess;
major_status = GSS_S_FAILURE;
code = krb5int_accessor (&kaccess, KRB5INT_ACCESS_VERSION);
if (code)
goto fail;
/* validate the context handle */
/*SUPPRESS 29*/
if (! kg_validate_ctx_id(*context_handle)) {
*minor_status = (OM_uint32) G_VALIDATE_FAILED;
return(GSS_S_NO_CONTEXT);
}
ctx = (krb5_gss_ctx_id_t) *context_handle;
/* make sure the context is non-established, and that certain
arguments are unchanged */
if ((ctx->established) ||
((ctx->gss_flags & GSS_C_MUTUAL_FLAG) == 0)) {
code = KG_CONTEXT_ESTABLISHED;
goto fail;
}
if (! krb5_principal_compare(context, ctx->there,
(krb5_principal) target_name)) {
(void)krb5_gss_delete_sec_context(minor_status,
context_handle, NULL);
code = 0;
major_status = GSS_S_BAD_NAME;
goto fail;
}
/* verify the token and leave the AP_REP message in ap_rep */
if (input_token == GSS_C_NO_BUFFER) {
(void)krb5_gss_delete_sec_context(minor_status,
context_handle, NULL);
code = 0;
major_status = GSS_S_DEFECTIVE_TOKEN;
goto fail;
}
ptr = (unsigned char *) input_token->value;
if (ctx->gss_flags & GSS_C_DCE_STYLE) {
/* Raw AP-REP */
ap_rep.length = input_token->length;
ap_rep.data = (char *)input_token->value;
} else if (g_verify_token_header(ctx->mech_used,
&(ap_rep.length),
&ptr, KG_TOK_CTX_AP_REP,
input_token->length, 1)) {
if (g_verify_token_header((gss_OID) ctx->mech_used,
&(ap_rep.length),
&ptr, KG_TOK_CTX_ERROR,
input_token->length, 1) == 0) {
/* Handle a KRB_ERROR message from the server */
sptr = (char *) ptr; /* PC compiler bug */
TREAD_STR(sptr, ap_rep.data, ap_rep.length);
code = krb5_rd_error(context, &ap_rep, &krb_error);
if (code)
goto fail;
if (krb_error->error)
code = (krb5_error_code)krb_error->error + ERROR_TABLE_BASE_krb5;
else
code = 0;
krb5_free_error(context, krb_error);
goto fail;
} else {
*minor_status = 0;
return(GSS_S_DEFECTIVE_TOKEN);
}
}
sptr = (char *) ptr; /* PC compiler bug */
TREAD_STR(sptr, ap_rep.data, ap_rep.length);
/* decode the ap_rep */
if ((code = krb5_rd_rep(context, ctx->auth_context, &ap_rep,
&ap_rep_data))) {
/*
* XXX A hack for backwards compatiblity.
* To be removed in 1999 -- proven
*/
krb5_auth_con_setuseruserkey(context, ctx->auth_context,
ctx->subkey);
if ((krb5_rd_rep(context, ctx->auth_context, &ap_rep,
&ap_rep_data)))
goto fail;
}
/* store away the sequence number */
ctx->seq_recv = ap_rep_data->seq_number;
g_order_init(&(ctx->seqstate), ctx->seq_recv,
(ctx->gss_flags & GSS_C_REPLAY_FLAG) != 0,
(ctx->gss_flags & GSS_C_SEQUENCE_FLAG) !=0, ctx->proto);
if (ap_rep_data->subkey != NULL &&
(ctx->proto == 1 || (ctx->gss_flags & GSS_C_DCE_STYLE) ||
ap_rep_data->subkey->enctype != ctx->subkey->enctype)) {
/* Keep acceptor's subkey. */
ctx->have_acceptor_subkey = 1;
code = krb5_copy_keyblock(context, ap_rep_data->subkey,
&ctx->acceptor_subkey);
if (code) {
krb5_free_ap_rep_enc_part(context, ap_rep_data);
goto fail;
}
code = kg_setup_keys(context, ctx, ctx->acceptor_subkey,
&ctx->acceptor_subkey_cksumtype);
if (code) {
krb5_free_ap_rep_enc_part(context, ap_rep_data);
goto fail;
}
}
/* free the ap_rep_data */
krb5_free_ap_rep_enc_part(context, ap_rep_data);
if (ctx->gss_flags & GSS_C_DCE_STYLE) {
krb5_data outbuf;
code = krb5_mk_rep_dce(context, ctx->auth_context, &outbuf);
if (code)
goto fail;
output_token->value = outbuf.data;
output_token->length = outbuf.length;
}
/* set established */
ctx->established = 1;
/* set returns */
if (time_rec) {
if ((code = krb5_timeofday(context, &now)))
goto fail;
*time_rec = ctx->krb_times.endtime - now;
}
if (ret_flags)
*ret_flags = ctx->gss_flags;
if (actual_mech_type)
*actual_mech_type = mech_type;
/* success */
*minor_status = 0;
return GSS_S_COMPLETE;
fail:
(void)krb5_gss_delete_sec_context(minor_status, context_handle, NULL);
*minor_status = code;
return (major_status);
}
OM_uint32
krb5_gss_init_sec_context(minor_status, claimant_cred_handle,
context_handle, target_name, mech_type,
req_flags, time_req, input_chan_bindings,
input_token, actual_mech_type, output_token,
ret_flags, time_rec)
OM_uint32 *minor_status;
gss_cred_id_t claimant_cred_handle;
gss_ctx_id_t *context_handle;
gss_name_t target_name;
gss_OID mech_type;
OM_uint32 req_flags;
OM_uint32 time_req;
gss_channel_bindings_t input_chan_bindings;
gss_buffer_t input_token;
gss_OID *actual_mech_type;
gss_buffer_t output_token;
OM_uint32 *ret_flags;
OM_uint32 *time_rec;
{
krb5_context context;
krb5_gss_cred_id_t cred;
int err;
krb5_error_code kerr;
int default_mech = 0;
OM_uint32 major_status;
OM_uint32 tmp_min_stat;
if (*context_handle == GSS_C_NO_CONTEXT) {
kerr = krb5_gss_init_context(&context);
if (kerr) {
*minor_status = kerr;
return GSS_S_FAILURE;
}
if (GSS_ERROR(kg_sync_ccache_name(context, minor_status))) {
save_error_info(*minor_status, context);
krb5_free_context(context);
return GSS_S_FAILURE;
}
} else {
context = ((krb5_gss_ctx_id_rec *)*context_handle)->k5_context;
}
/* set up return values so they can be "freed" successfully */
major_status = GSS_S_FAILURE; /* Default major code */
output_token->length = 0;
output_token->value = NULL;
if (actual_mech_type)
*actual_mech_type = NULL;
/* verify that the target_name is valid and usable */
if (! kg_validate_name(target_name)) {
*minor_status = (OM_uint32) G_VALIDATE_FAILED;
save_error_info(*minor_status, context);
if (*context_handle == GSS_C_NO_CONTEXT)
krb5_free_context(context);
return(GSS_S_CALL_BAD_STRUCTURE|GSS_S_BAD_NAME);
}
/* verify the credential, or use the default */
/*SUPPRESS 29*/
if (claimant_cred_handle == GSS_C_NO_CREDENTIAL) {
major_status = kg_get_defcred(minor_status, (gss_cred_id_t *)&cred);
if (major_status && GSS_ERROR(major_status)) {
if (*context_handle == GSS_C_NO_CONTEXT)
krb5_free_context(context);
return(major_status);
}
} else {
major_status = krb5_gss_validate_cred(minor_status, claimant_cred_handle);
if (GSS_ERROR(major_status)) {
save_error_info(*minor_status, context);
if (*context_handle == GSS_C_NO_CONTEXT)
krb5_free_context(context);
return(major_status);
}
cred = (krb5_gss_cred_id_t) claimant_cred_handle;
}
kerr = k5_mutex_lock(&cred->lock);
if (kerr) {
if (claimant_cred_handle == GSS_C_NO_CREDENTIAL)
krb5_gss_release_cred(minor_status, (gss_cred_id_t *)&cred);
krb5_free_context(context);
*minor_status = kerr;
return GSS_S_FAILURE;
}
/* verify the mech_type */
err = 0;
if (mech_type == GSS_C_NULL_OID) {
default_mech = 1;
if (cred->rfc_mech) {
mech_type = (gss_OID) gss_mech_krb5;
} else if (cred->prerfc_mech) {
mech_type = (gss_OID) gss_mech_krb5_old;
} else {
err = 1;
}
} else if (g_OID_equal(mech_type, gss_mech_krb5)) {
if (!cred->rfc_mech)
err = 1;
} else if (g_OID_equal(mech_type, gss_mech_krb5_old)) {
if (!cred->prerfc_mech)
err = 1;
} else if (g_OID_equal(mech_type, gss_mech_krb5_wrong)) {
if (!cred->rfc_mech)
err = 1;
} else {
err = 1;
}
if (err) {
k5_mutex_unlock(&cred->lock);
if (claimant_cred_handle == GSS_C_NO_CREDENTIAL)
krb5_gss_release_cred(minor_status, (gss_cred_id_t *)&cred);
*minor_status = 0;
if (*context_handle == GSS_C_NO_CONTEXT)
krb5_free_context(context);
return(GSS_S_BAD_MECH);
}
/* is this a new connection or not? */
/*SUPPRESS 29*/
if (*context_handle == GSS_C_NO_CONTEXT) {
major_status = new_connection(minor_status, cred, context_handle,
target_name, mech_type, req_flags,
time_req, input_chan_bindings,
input_token, actual_mech_type,
output_token, ret_flags, time_rec,
context, default_mech);
k5_mutex_unlock(&cred->lock);
if (*context_handle == GSS_C_NO_CONTEXT) {
save_error_info (*minor_status, context);
krb5_free_context(context);
} else
((krb5_gss_ctx_id_rec *) *context_handle)->k5_context = context;
} else {
/* mutual_auth doesn't care about the credentials */
k5_mutex_unlock(&cred->lock);
major_status = mutual_auth(minor_status, context_handle,
target_name, mech_type, req_flags,
time_req, input_chan_bindings,
input_token, actual_mech_type,
output_token, ret_flags, time_rec,
context);
/* If context_handle is now NO_CONTEXT, mutual_auth called
delete_sec_context, which would've zapped the krb5 context
too. */
}
if (claimant_cred_handle == GSS_C_NO_CREDENTIAL)
krb5_gss_release_cred(&tmp_min_stat, (gss_cred_id_t *)&cred);
return(major_status);
}
#ifndef _WIN32
k5_mutex_t kg_kdc_flag_mutex = K5_MUTEX_PARTIAL_INITIALIZER;
static int kdc_flag = 0;
#endif
krb5_error_code
krb5_gss_init_context (krb5_context *ctxp)
{
krb5_error_code err;
#ifndef _WIN32
int is_kdc;
#endif
err = gss_krb5int_initialize_library();
if (err)
return err;
#ifndef _WIN32
err = k5_mutex_lock(&kg_kdc_flag_mutex);
if (err)
return err;
is_kdc = kdc_flag;
k5_mutex_unlock(&kg_kdc_flag_mutex);
if (is_kdc)
return krb5int_init_context_kdc(ctxp);
#endif
return krb5_init_context(ctxp);
}
#ifndef _WIN32
OM_uint32
krb5int_gss_use_kdc_context(OM_uint32 *minor_status,
const gss_OID desired_mech,
const gss_OID desired_object,
gss_buffer_t value)
{
OM_uint32 err;
*minor_status = 0;
err = gss_krb5int_initialize_library();
if (err)
return err;
*minor_status = k5_mutex_lock(&kg_kdc_flag_mutex);
if (*minor_status) {
return GSS_S_FAILURE;
}
kdc_flag = 1;
k5_mutex_unlock(&kg_kdc_flag_mutex);
return GSS_S_COMPLETE;
}
#endif
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