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62270350bcad087f3d53aae16fe78dab265ea5b7
heimdal/lib/gssapi/spnego/accept_sec_context.c
Love Hörnquist Åstrand 62270350bc try harder to handle names better. handle missing acceptor and initator creds better (ie dont propose/accept mech that there are no credentials for) split NegTokenInit and NegTokenResp in acceptor 
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@19397 ec53bebd-3082-4978-b11e-865c3cabbd6b
2006-12-18 12:59:50 +00:00

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/*
* Copyright (c) 1997 - 2006 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* Portions Copyright (c) 2004 PADL Software Pty Ltd.
*
* 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 the Institute 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 THE INSTITUTE 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 INSTITUTE 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("$Id$");
static OM_uint32
send_reject (OM_uint32 *minor_status,
gss_buffer_t output_token)
{
NegotiationToken nt;
size_t size;
nt.element = choice_NegotiationToken_negTokenResp;
ALLOC(nt.u.negTokenResp.negResult, 1);
if (nt.u.negTokenResp.negResult == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
*(nt.u.negTokenResp.negResult) = reject;
nt.u.negTokenResp.supportedMech = NULL;
nt.u.negTokenResp.responseToken = NULL;
nt.u.negTokenResp.mechListMIC = NULL;
ASN1_MALLOC_ENCODE(NegotiationToken,
output_token->value, output_token->length, &nt,
&size, *minor_status);
free_NegotiationToken(&nt);
if (*minor_status != 0)
return GSS_S_FAILURE;
return GSS_S_BAD_MECH;
}
static int
initiator_approved(gss_name_t target_name, gss_OID mech)
{
OM_uint32 min_stat, maj_stat;
gss_ctx_id_t ctx = GSS_C_NO_CONTEXT;
gss_buffer_desc out;
maj_stat = gss_init_sec_context(&min_stat,
GSS_C_NO_CREDENTIAL,
&ctx,
target_name,
mech,
0,
GSS_C_INDEFINITE,
GSS_C_NO_CHANNEL_BINDINGS,
GSS_C_NO_BUFFER,
NULL,
&out,
NULL,
NULL);
if (GSS_ERROR(maj_stat))
return 0;
gss_release_buffer(&min_stat, &out);
gss_delete_sec_context(&min_stat, &ctx, NULL);
return 1;
}
OM_uint32
_gss_spnego_indicate_mechtypelist (OM_uint32 *minor_status,
gss_name_t target_name,
int includeMSCompatOID,
const gssspnego_cred cred_handle,
MechTypeList *mechtypelist,
gss_OID *preferred_mech)
{
OM_uint32 ret;
gss_OID_set supported_mechs = GSS_C_NO_OID_SET;
gss_OID first_mech = GSS_C_NO_OID;
int i, count;
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;
}
count = supported_mechs->count + 1;
if (includeMSCompatOID)
count++;
mechtypelist->len = 0;
mechtypelist->val = calloc(count, sizeof(MechType));
if (mechtypelist->val == NULL) {
*minor_status = ENOMEM;
gss_release_oid_set(minor_status, &supported_mechs);
return GSS_S_FAILURE;
}
if (target_name && initiator_approved(target_name, GSS_KRB5_MECHANISM)) {
ret = _gss_spnego_add_mech_type(GSS_KRB5_MECHANISM,
includeMSCompatOID,
mechtypelist);
if (!GSS_ERROR(ret))
first_mech = GSS_KRB5_MECHANISM;
}
for (i = 0; i < supported_mechs->count; i++) {
if (gss_oid_equal(&supported_mechs->elements[i], GSS_SPNEGO_MECHANISM))
continue;
if (gss_oid_equal(&supported_mechs->elements[i], GSS_KRB5_MECHANISM))
continue;
if (target_name && !initiator_approved(target_name,
&supported_mechs->elements[i]))
continue;
ret = _gss_spnego_add_mech_type(&supported_mechs->elements[i],
includeMSCompatOID,
mechtypelist);
if (ret != 0) {
*minor_status = ENOMEM;
ret = GSS_S_FAILURE;
break;
}
if (first_mech == GSS_C_NO_OID)
first_mech = &supported_mechs->elements[i];
}
if (mechtypelist->len == 0) {
free_MechTypeList(mechtypelist);
gss_release_oid_set(minor_status, &supported_mechs);
*minor_status = 0;
return GSS_S_BAD_MECH;
}
if (ret == GSS_S_COMPLETE && preferred_mech != NULL) {
ret = gss_duplicate_oid(minor_status, first_mech, preferred_mech);
}
if (ret != GSS_S_COMPLETE) {
free_MechTypeList(mechtypelist);
mechtypelist->len = 0;
mechtypelist->val = NULL;
}
gss_release_oid_set(minor_status, &supported_mechs);
return ret;
}
static OM_uint32
send_supported_mechs (OM_uint32 *minor_status,
gss_buffer_t output_token)
{
NegotiationToken nt;
#if 0
char hostname[MAXHOSTNAMELEN], *p;
gss_buffer_desc name_buf;
gss_OID name_type;
gss_name_t target_princ;
gss_name_t canon_princ;
OM_uint32 minor;
#endif
size_t buf_len;
gss_buffer_desc data;
OM_uint32 ret;
memset(&nt, 0, sizeof(nt));
nt.element = choice_NegotiationToken_negTokenInit;
nt.u.negTokenInit.reqFlags = NULL;
nt.u.negTokenInit.mechToken = NULL;
#if 0
nt.u.negTokenInit.negHints = NULL;
#endif
nt.u.negTokenInit.mechListMIC = NULL;
ret = _gss_spnego_indicate_mechtypelist(minor_status, GSS_C_NO_NAME, 1,
NULL,
&nt.u.negTokenInit.mechTypes, NULL);
if (ret != GSS_S_COMPLETE) {
return ret;
}
#if 0
memset(&target_princ, 0, sizeof(target_princ));
if (gethostname(hostname, sizeof(hostname) - 1) != 0) {
*minor_status = errno;
free_NegotiationToken(&nt);
return GSS_S_FAILURE;
}
/* Send the constructed SAM name for this host */
for (p = hostname; *p != '\0' && *p != '.'; p++) {
*p = toupper((unsigned char)*p);
}
*p++ = '$';
*p = '\0';
name_buf.length = strlen(hostname);
name_buf.value = hostname;
ret = gss_import_name(minor_status, &name_buf,
GSS_C_NO_OID,
&target_princ);
if (ret != GSS_S_COMPLETE) {
free_NegotiationToken(&nt);
return ret;
}
name_buf.length = 0;
name_buf.value = NULL;
/* Canonicalize the name using the preferred mechanism */
ret = gss_canonicalize_name(minor_status,
target_princ,
GSS_C_NO_OID,
&canon_princ);
if (ret != GSS_S_COMPLETE) {
free_NegotiationToken(&nt);
gss_release_name(&minor, &target_princ);
return ret;
}
ret = gss_display_name(minor_status, canon_princ,
&name_buf, &name_type);
if (ret != GSS_S_COMPLETE) {
free_NegotiationToken(&nt);
gss_release_name(&minor, &canon_princ);
gss_release_name(&minor, &target_princ);
return ret;
}
gss_release_name(&minor, &canon_princ);
gss_release_name(&minor, &target_princ);
ALLOC(nt.u.negTokenInit.negHints, 1);
if (nt.u.negTokenInit.negHints == NULL) {
*minor_status = ENOMEM;
gss_release_buffer(&minor, &name_buf);
free_NegotiationToken(&nt);
return GSS_S_FAILURE;
}
ALLOC(nt.u.negTokenInit.negHints->hintName, 1);
if (nt.u.negTokenInit.negHints->hintName == NULL) {
*minor_status = ENOMEM;
gss_release_buffer(&minor, &name_buf);
free_NegotiationToken(&nt);
return GSS_S_FAILURE;
}
*(nt.u.negTokenInit.negHints->hintName) = name_buf.value;
name_buf.value = NULL;
nt.u.negTokenInit.negHints->hintAddress = NULL;
#endif
ASN1_MALLOC_ENCODE(NegotiationToken, data.value, data.length, &nt, &buf_len, ret);
if (ret) {
free_NegotiationToken(&nt);
return ret;
}
if (data.length != buf_len)
abort();
ret = gss_encapsulate_token(&data, GSS_SPNEGO_MECHANISM, output_token);
free (data.value);
free_NegotiationToken(&nt);
if (ret != GSS_S_COMPLETE)
return ret;
*minor_status = 0;
return GSS_S_CONTINUE_NEEDED;
}
static OM_uint32
send_accept (OM_uint32 *minor_status,
gssspnego_ctx context_handle,
gss_buffer_t mech_token,
int initial_response,
gss_buffer_t mech_buf,
gss_buffer_t output_token)
{
NegotiationToken nt;
OM_uint32 ret;
gss_buffer_desc mech_mic_buf;
size_t size;
memset(&nt, 0, sizeof(nt));
nt.element = choice_NegotiationToken_negTokenResp;
ALLOC(nt.u.negTokenResp.negResult, 1);
if (nt.u.negTokenResp.negResult == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
if (context_handle->open) {
if (mech_token != GSS_C_NO_BUFFER
&& mech_token->length != 0
&& mech_buf != GSS_C_NO_BUFFER)
*(nt.u.negTokenResp.negResult) = accept_incomplete;
else
*(nt.u.negTokenResp.negResult) = accept_completed;
} else {
if (initial_response && context_handle->require_mic)
*(nt.u.negTokenResp.negResult) = request_mic;
else
*(nt.u.negTokenResp.negResult) = accept_incomplete;
}
if (initial_response) {
ALLOC(nt.u.negTokenResp.supportedMech, 1);
if (nt.u.negTokenResp.supportedMech == NULL) {
free_NegotiationToken(&nt);
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
ret = der_get_oid(context_handle->preferred_mech_type->elements,
context_handle->preferred_mech_type->length,
nt.u.negTokenResp.supportedMech,
NULL);
if (ret) {
free_NegotiationToken(&nt);
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
} else {
nt.u.negTokenResp.supportedMech = NULL;
}
if (mech_token != GSS_C_NO_BUFFER && mech_token->length != 0) {
ALLOC(nt.u.negTokenResp.responseToken, 1);
if (nt.u.negTokenResp.responseToken == NULL) {
free_NegotiationToken(&nt);
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
nt.u.negTokenResp.responseToken->length = mech_token->length;
nt.u.negTokenResp.responseToken->data = mech_token->value;
mech_token->length = 0;
mech_token->value = NULL;
} else {
nt.u.negTokenResp.responseToken = NULL;
}
if (mech_buf != GSS_C_NO_BUFFER) {
ret = gss_get_mic(minor_status,
context_handle->negotiated_ctx_id,
0,
mech_buf,
&mech_mic_buf);
if (ret == GSS_S_COMPLETE) {
ALLOC(nt.u.negTokenResp.mechListMIC, 1);
if (nt.u.negTokenResp.mechListMIC == NULL) {
gss_release_buffer(minor_status, &mech_mic_buf);
free_NegotiationToken(&nt);
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
nt.u.negTokenResp.mechListMIC->length = mech_mic_buf.length;
nt.u.negTokenResp.mechListMIC->data = mech_mic_buf.value;
} else if (ret == GSS_S_UNAVAILABLE) {
nt.u.negTokenResp.mechListMIC = NULL;
} else {
free_NegotiationToken(&nt);
return ret;
}
} else
nt.u.negTokenResp.mechListMIC = NULL;
ASN1_MALLOC_ENCODE(NegotiationToken,
output_token->value, output_token->length,
&nt, &size, ret);
if (ret) {
free_NegotiationToken(&nt);
*minor_status = ret;
return GSS_S_FAILURE;
}
/*
* The response should not be encapsulated, because
* it is a SubsequentContextToken (note though RFC 1964
* specifies encapsulation for all _Kerberos_ tokens).
*/
if (*(nt.u.negTokenResp.negResult) == accept_completed)
ret = GSS_S_COMPLETE;
else
ret = GSS_S_CONTINUE_NEEDED;
free_NegotiationToken(&nt);
return ret;
}
static OM_uint32
verify_mechlist_mic
(OM_uint32 *minor_status,
gssspnego_ctx context_handle,
gss_buffer_t mech_buf,
heim_octet_string *mechListMIC
)
{
OM_uint32 ret;
gss_buffer_desc mic_buf;
if (context_handle->verified_mic) {
/* This doesn't make sense, we've already verified it? */
*minor_status = 0;
return GSS_S_DUPLICATE_TOKEN;
}
if (mechListMIC == NULL) {
*minor_status = 0;
return GSS_S_DEFECTIVE_TOKEN;
}
mic_buf.length = mechListMIC->length;
mic_buf.value = mechListMIC->data;
ret = gss_verify_mic(minor_status,
context_handle->negotiated_ctx_id,
mech_buf,
&mic_buf,
NULL);
if (ret != GSS_S_COMPLETE)
ret = GSS_S_DEFECTIVE_TOKEN;
return ret;
}
static OM_uint32
acceptor_complete(OM_uint32 * minor_status,
gssspnego_ctx ctx,
int *get_mic,
gss_buffer_t mech_buf,
gss_buffer_t mech_input_token,
gss_buffer_t mech_output_token,
heim_octet_string *mic,
gss_buffer_t output_token)
{
OM_uint32 ret;
int require_mic, verify_mic;
gss_buffer_desc buf;
buf.length = 0;
buf.value = NULL;
ret = _gss_spnego_require_mechlist_mic(minor_status, ctx, &require_mic);
if (ret)
return ret;
ctx->require_mic = require_mic;
if (mic != NULL)
require_mic = 1;
if (ctx->open && require_mic) {
if (mech_input_token == GSS_C_NO_BUFFER) { /* Even/One */
verify_mic = 1;
*get_mic = 0;
} else if (mech_output_token != GSS_C_NO_BUFFER &&
mech_output_token->length == 0) { /* Odd */
*get_mic = verify_mic = 1;
} else { /* Even/One */
verify_mic = 0;
*get_mic = 1;
}
if (verify_mic || get_mic) {
int eret;
size_t buf_len;
ASN1_MALLOC_ENCODE(MechTypeList,
mech_buf->value, mech_buf->length,
&ctx->initiator_mech_types, &buf_len, eret);
if (eret) {
*minor_status = eret;
return GSS_S_FAILURE;
}
if (buf.length != buf_len)
abort();
}
if (verify_mic) {
ret = verify_mechlist_mic(minor_status, ctx, mech_buf, mic);
if (ret) {
if (get_mic)
send_reject (minor_status, output_token);
if (buf.value)
free(buf.value);
return ret;
}
ctx->verified_mic = 1;
}
if (buf.value)
free(buf.value);
} else
*get_mic = verify_mic = 0;
return GSS_S_COMPLETE;
}
static OM_uint32
acceptor_start
(OM_uint32 * minor_status,
gss_ctx_id_t * context_handle,
const gss_cred_id_t acceptor_cred_handle,
const gss_buffer_t input_token_buffer,
const gss_channel_bindings_t input_chan_bindings,
gss_name_t * src_name,
gss_OID * mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec,
gss_cred_id_t *delegated_cred_handle
)
{
OM_uint32 ret, ret2, minor;
NegTokenInit ni;
size_t ni_len;
int i;
gss_buffer_desc data;
size_t len, taglen;
unsigned int negResult = accept_incomplete;
gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
gss_buffer_desc mech_output_token;
gss_buffer_desc mech_buf;
gss_OID preferred_mech_type = GSS_C_NO_OID;
gssspnego_ctx ctx;
gssspnego_cred acceptor_cred = (gssspnego_cred)acceptor_cred_handle;
int first_mech = 0;
mech_output_token.value = NULL;
mech_output_token.length = 0;
mech_buf.value = NULL;
if (*context_handle == GSS_C_NO_CONTEXT) {
ret = _gss_spnego_alloc_sec_context(minor_status,
context_handle);
if (ret != GSS_S_COMPLETE)
return ret;
if (input_token_buffer->length == 0) {
return send_supported_mechs (minor_status,
output_token);
}
}
ctx = (gssspnego_ctx)*context_handle;
/*
* The GSS-API encapsulation is only present on the initial
* context token (negTokenInit).
*/
ret = gss_decapsulate_token (input_token_buffer,
GSS_SPNEGO_MECHANISM,
&data);
if (ret)
return ret;
ret = der_match_tag_and_length(data.value, data.length,
ASN1_C_CONTEXT, CONS,
0,
&len, &taglen);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
if (len > data.length - taglen) {
*minor_status = ASN1_OVERRUN;
return GSS_S_FAILURE;
}
ret = decode_NegTokenInit((const unsigned char *)data.value + taglen,
len, &ni, &ni_len);
if (ret) {
*minor_status = ret;
return GSS_S_DEFECTIVE_TOKEN;
}
/* Call glue layer to find first mech we support */
for (i = 0; i < ni.mechTypes.len; ++i) {
ret = _gss_spnego_select_mech(minor_status, &ni.mechTypes.val[i],
&preferred_mech_type);
if (ret == 0)
break;
}
if (i == 0)
first_mech = 1;
if (preferred_mech_type == GSS_C_NO_OID) {
free_NegTokenInit(&ni);
return GSS_S_BAD_MECH;
}
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
ctx->preferred_mech_type = preferred_mech_type;
ctx->negotiated_mech_type = preferred_mech_type;
ctx->initiator_mech_types.len = ni.mechTypes.len;
ctx->initiator_mech_types.val = ni.mechTypes.val;
ni.mechTypes.len = 0;
ni.mechTypes.val = NULL;
{
gss_buffer_desc ibuf;
int get_mic = 0;
int require_response;
if (ni.mechToken != NULL && first_mech) {
ibuf.length = ni.mechToken->length;
ibuf.value = ni.mechToken->data;
mech_input_token = &ibuf;
} else {
ibuf.value = NULL;
ibuf.length = 0;
}
if (mech_input_token != GSS_C_NO_BUFFER) {
gss_cred_id_t mech_delegated_cred = GSS_C_NO_CREDENTIAL;
gss_cred_id_t mech_cred;
if (acceptor_cred != NULL)
mech_cred = acceptor_cred->negotiated_cred_id;
else
mech_cred = GSS_C_NO_CREDENTIAL;
if (ctx->mech_src_name != GSS_C_NO_NAME)
gss_release_name(&minor, &ctx->mech_src_name);
if (ctx->delegated_cred_id != GSS_C_NO_CREDENTIAL)
_gss_spnego_release_cred(&minor, &ctx->delegated_cred_id);
ret = gss_accept_sec_context(&minor,
&ctx->negotiated_ctx_id,
mech_cred,
mech_input_token,
input_chan_bindings,
&ctx->mech_src_name,
&ctx->negotiated_mech_type,
&mech_output_token,
&ctx->mech_flags,
&ctx->mech_time_rec,
&mech_delegated_cred);
if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
if (delegated_cred_handle) {
ret = _gss_spnego_alloc_cred(minor_status,
mech_delegated_cred,
delegated_cred_handle);
} else {
gss_release_cred(&ret2, &mech_delegated_cred);
}
}
if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
free_NegTokenInit(&ni);
send_reject (minor_status, output_token);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
return ret;
}
if (ret == GSS_S_COMPLETE) {
ctx->open = 1;
ret = acceptor_complete(minor_status,
ctx,
&get_mic,
&mech_buf,
mech_input_token,
&mech_output_token,
ni.mechListMIC,
output_token);
}
} else
ret = GSS_S_COMPLETE;
if (ctx->mech_flags & GSS_C_DCE_STYLE)
require_response = (negResult != accept_completed);
else
require_response = 0;
/*
* Check whether we need to send a result: there should be only
* one accept_completed response sent in the entire negotiation
*/
if ((mech_output_token.length != 0)
|| (ctx->open && negResult == accept_incomplete)
|| require_response
|| get_mic
|| !first_mech) {
ret2 = send_accept (minor_status,
ctx,
&mech_output_token,
1,
get_mic ? &mech_buf : NULL,
output_token);
if (ret2) {
ret = ret2;
goto out;
}
}
out:
if (mech_output_token.value != NULL)
gss_release_buffer(&minor, &mech_output_token);
if (mech_buf.value != NULL)
free(mech_buf.value);
free_NegTokenInit(&ni);
}
if (ret == GSS_S_COMPLETE) {
if (src_name != NULL && ctx->mech_src_name != NULL) {
ret2 = gss_duplicate_name(minor_status,
ctx->mech_src_name,
src_name);
if (ret2 != GSS_S_COMPLETE)
ret = ret2;
}
if (delegated_cred_handle != NULL) {
*delegated_cred_handle = ctx->delegated_cred_id;
ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
}
}
if (mech_type != NULL)
*mech_type = ctx->negotiated_mech_type;
if (ret_flags != NULL)
*ret_flags = ctx->mech_flags;
if (time_rec != NULL)
*time_rec = ctx->mech_time_rec;
if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
return ret;
}
_gss_spnego_internal_delete_sec_context(&minor, context_handle,
GSS_C_NO_BUFFER);
return ret;
}
static OM_uint32
acceptor_continue
(OM_uint32 * minor_status,
gss_ctx_id_t * context_handle,
const gss_cred_id_t acceptor_cred_handle,
const gss_buffer_t input_token_buffer,
const gss_channel_bindings_t input_chan_bindings,
gss_name_t * src_name,
gss_OID * mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec,
gss_cred_id_t *delegated_cred_handle
)
{
OM_uint32 ret, ret2, minor;
NegTokenResp na;
size_t na_len;
gss_buffer_desc data;
size_t len, taglen;
unsigned int negResult = accept_incomplete;
gss_buffer_t mech_input_token = GSS_C_NO_BUFFER;
gss_buffer_t mech_output_token = GSS_C_NO_BUFFER;
gss_buffer_desc mech_buf;
gssspnego_ctx ctx;
gssspnego_cred acceptor_cred = (gssspnego_cred)acceptor_cred_handle;
mech_buf.value = NULL;
ctx = (gssspnego_ctx)*context_handle;
/*
* The GSS-API encapsulation is only present on the initial
* context token (negTokenInit).
*/
data.value = input_token_buffer->value;
data.length = input_token_buffer->length;
ret = der_match_tag_and_length(data.value, data.length,
ASN1_C_CONTEXT, CONS,
1,
&len, &taglen);
if (ret) {
*minor_status = ret;
return GSS_S_FAILURE;
}
if (len > data.length - taglen) {
*minor_status = ASN1_OVERRUN;
return GSS_S_FAILURE;
}
ret = decode_NegTokenResp((const unsigned char *)data.value + taglen,
len, &na, &na_len);
if (ret) {
*minor_status = ret;
return GSS_S_DEFECTIVE_TOKEN;
}
if (na.negResult != NULL) {
negResult = *(na.negResult);
}
HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
{
gss_buffer_desc ibuf, obuf;
int require_mic, get_mic;
int require_response;
heim_octet_string *mic;
if (na.responseToken != NULL) {
ibuf.length = na.responseToken->length;
ibuf.value = na.responseToken->data;
mech_input_token = &ibuf;
} else {
ibuf.value = NULL;
ibuf.length = 0;
}
if (mech_input_token != GSS_C_NO_BUFFER) {
gss_cred_id_t mech_cred;
gss_cred_id_t mech_delegated_cred;
gss_cred_id_t *mech_delegated_cred_p;
if (acceptor_cred != NULL)
mech_cred = acceptor_cred->negotiated_cred_id;
else
mech_cred = GSS_C_NO_CREDENTIAL;
if (delegated_cred_handle != NULL) {
mech_delegated_cred = GSS_C_NO_CREDENTIAL;
mech_delegated_cred_p = &mech_delegated_cred;
} else {
mech_delegated_cred_p = NULL;
}
if (ctx->mech_src_name != GSS_C_NO_NAME)
gss_release_name(&minor, &ctx->mech_src_name);
if (ctx->delegated_cred_id != GSS_C_NO_CREDENTIAL)
_gss_spnego_release_cred(&minor, &ctx->delegated_cred_id);
ret = gss_accept_sec_context(&minor,
&ctx->negotiated_ctx_id,
mech_cred,
mech_input_token,
input_chan_bindings,
&ctx->mech_src_name,
&ctx->negotiated_mech_type,
&obuf,
&ctx->mech_flags,
&ctx->mech_time_rec,
mech_delegated_cred_p);
if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
if (mech_delegated_cred_p != NULL &&
mech_delegated_cred != GSS_C_NO_CREDENTIAL) {
ret2 = _gss_spnego_alloc_cred(minor_status,
mech_delegated_cred,
&ctx->delegated_cred_id);
if (ret2 != GSS_S_COMPLETE)
ret = ret2;
}
mech_output_token = &obuf;
}
if (ret != GSS_S_COMPLETE && ret != GSS_S_CONTINUE_NEEDED) {
free_NegTokenResp(&na);
send_reject (minor_status, output_token);
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
return ret;
}
if (ret == GSS_S_COMPLETE)
ctx->open = 1;
} else
ret = GSS_S_COMPLETE;
ret2 = _gss_spnego_require_mechlist_mic(minor_status,
ctx,
&require_mic);
if (ret2)
goto out;
ctx->require_mic = require_mic;
mic = na.mechListMIC;
if (mic != NULL)
require_mic = 1;
if (ret == GSS_S_COMPLETE)
ret = acceptor_complete(minor_status,
ctx,
&get_mic,
&mech_buf,
mech_input_token,
mech_output_token,
na.mechListMIC,
output_token);
if (ctx->mech_flags & GSS_C_DCE_STYLE)
require_response = (negResult != accept_completed);
else
require_response = 0;
/*
* Check whether we need to send a result: there should be only
* one accept_completed response sent in the entire negotiation
*/
if ((mech_output_token != GSS_C_NO_BUFFER &&
mech_output_token->length != 0)
|| (ctx->open && negResult == accept_incomplete)
|| require_response
|| get_mic) {
ret2 = send_accept (minor_status,
ctx,
mech_output_token,
0,
get_mic ? &mech_buf : NULL,
output_token);
if (ret2)
goto out;
}
out:
if (ret2 != GSS_S_COMPLETE)
ret = ret2;
if (mech_output_token != NULL)
gss_release_buffer(&minor, mech_output_token);
if (mech_buf.value != NULL)
free(mech_buf.value);
free_NegTokenResp(&na);
}
if (ret == GSS_S_COMPLETE) {
if (src_name != NULL) {
ret2 = gss_duplicate_name(minor_status,
ctx->mech_src_name,
src_name);
if (ret2 != GSS_S_COMPLETE)
ret = ret2;
}
if (delegated_cred_handle != NULL) {
*delegated_cred_handle = ctx->delegated_cred_id;
ctx->delegated_cred_id = GSS_C_NO_CREDENTIAL;
}
}
if (mech_type != NULL)
*mech_type = ctx->negotiated_mech_type;
if (ret_flags != NULL)
*ret_flags = ctx->mech_flags;
if (time_rec != NULL)
*time_rec = ctx->mech_time_rec;
if (ret == GSS_S_COMPLETE || ret == GSS_S_CONTINUE_NEEDED) {
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
return ret;
}
_gss_spnego_internal_delete_sec_context(&minor, context_handle,
GSS_C_NO_BUFFER);
return ret;
}
OM_uint32
_gss_spnego_accept_sec_context
(OM_uint32 * minor_status,
gss_ctx_id_t * context_handle,
const gss_cred_id_t acceptor_cred_handle,
const gss_buffer_t input_token_buffer,
const gss_channel_bindings_t input_chan_bindings,
gss_name_t * src_name,
gss_OID * mech_type,
gss_buffer_t output_token,
OM_uint32 * ret_flags,
OM_uint32 * time_rec,
gss_cred_id_t *delegated_cred_handle
)
{
_gss_accept_sec_context_t *func;
*minor_status = 0;
output_token->length = 0;
output_token->value = NULL;
if (src_name != NULL)
*src_name = GSS_C_NO_NAME;
if (mech_type != NULL)
*mech_type = GSS_C_NO_OID;
if (ret_flags != NULL)
*ret_flags = 0;
if (time_rec != NULL)
*time_rec = 0;
if (delegated_cred_handle != NULL)
*delegated_cred_handle = GSS_C_NO_CREDENTIAL;
if (*context_handle == GSS_C_NO_CONTEXT)
func = acceptor_start;
else
func = acceptor_continue;
return (*func)(minor_status, context_handle, acceptor_cred_handle,
input_token_buffer, input_chan_bindings,
src_name, mech_type, output_token, ret_flags,
time_rec, delegated_cred_handle);
}
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