#include "spnego_locl.h"
gss_OID_desc _gss_spnego_mskrb_mechanism_oid_desc =
{9, rk_UNCONST("\x2a\x86\x48\x82\xf7\x12\x01\x02\x02")};
gss_OID_desc _gss_spnego_krb5_mechanism_oid_desc =
{9, rk_UNCONST("\x2a\x86\x48\x86\xf7\x12\x01\x02\x02")};
OM_uint32 GSSAPI_CALLCONV
_gss_spnego_alloc_sec_context (OM_uint32 * minor_status,
gss_ctx_id_t *context_handle)
{
gssspnego_ctx ctx;
ctx = calloc(1, sizeof(*ctx));
if (ctx == NULL) {
*minor_status = ENOMEM;
return GSS_S_FAILURE;
}
ctx->NegTokenInit_mech_types.value = NULL;
ctx->NegTokenInit_mech_types.length = 0;
ctx->preferred_mech_type = GSS_C_NO_OID;
ctx->selected_mech_type = GSS_C_NO_OID;
ctx->negotiated_mech_type = GSS_C_NO_OID;
ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
ctx->mech_src_name = GSS_C_NO_NAME;
ctx->flags.open = 0;
ctx->flags.local = 0;
ctx->flags.peer_require_mic = 0;
ctx->flags.require_mic = 0;
ctx->flags.verified_mic = 0;
HEIMDAL_MUTEX_init(&ctx->ctx_id_mutex);
*context_handle = (gss_ctx_id_t)ctx;
return GSS_S_COMPLETE;
}
OM_uint32 GSSAPI_CALLCONV _gss_spnego_internal_delete_sec_context
(OM_uint32 *minor_status,
gss_ctx_id_t *context_handle,
gss_buffer_t output_token
)
{
gssspnego_ctx ctx;
OM_uint32 ret, minor;
*minor_status = 0;
if (context_handle == NULL) {
return GSS_S_NO_CONTEXT;
}
if (output_token != GSS_C_NO_BUFFER) {
output_token->length = 0;
output_token->value = NULL;
}
ctx = (gssspnego_ctx)*context_handle;
*context_handle = GSS_C_NO_CONTEXT;
if (ctx == NULL) {
return GSS_S_NO_CONTEXT;
}
if (ctx->NegTokenInit_mech_types.value)
free(ctx->NegTokenInit_mech_types.value);
ctx->negotiated_mech_type = GSS_C_NO_OID;
ctx->selected_mech_type = GSS_C_NO_OID;
gss_release_name(&minor, &ctx->target_name);
gss_release_name(&minor, &ctx->mech_src_name);
if (ctx->negotiated_ctx_id != GSS_C_NO_CONTEXT) {
ret = gss_delete_sec_context(minor_status,
&ctx->negotiated_ctx_id,
NULL);
ctx->negotiated_ctx_id = GSS_C_NO_CONTEXT;
} else {
ret = GSS_S_COMPLETE;
}
HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
HEIMDAL_MUTEX_destroy(&ctx->ctx_id_mutex);
free(ctx);
return ret;
}
void
_gss_spnego_fixup_ntlm(gssspnego_ctx ctx)
{
if (gss_oid_equal(ctx->negotiated_mech_type, GSS_NTLM_MECHANISM)) {
gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET;
OM_uint32 junk;
gss_inquire_sec_context_by_oid(&junk, ctx->negotiated_ctx_id,
GSS_C_NTLM_RESET_KEYS,
&buffer_set);
gss_release_buffer_set(&junk, &buffer_set);
}
}
int
_gss_spnego_require_mechlist_mic(gssspnego_ctx ctx)
{
gss_buffer_set_t buffer_set = GSS_C_NO_BUFFER_SET;
int require_mic;
OM_uint32 minor;
require_mic = 1;
if (ctx->flags.peer_require_mic)
return 1;
if (ctx->flags.protocol_require_no_mic)
return 0;
if (gss_inquire_sec_context_by_oid(&minor, ctx->negotiated_ctx_id,
GSS_C_PEER_HAS_UPDATED_SPNEGO,
&buffer_set) == GSS_S_COMPLETE) {
require_mic = 1;
gss_release_buffer_set(&minor, &buffer_set);
}
if (ctx->flags.local && gss_oid_equal(ctx->negotiated_mech_type, GSS_NTLM_MECHANISM))
require_mic = 0;
if (gss_oid_equal(ctx->negotiated_mech_type, ctx->preferred_mech_type)) {
ctx->flags.safe_omit = 1;
} else if (gss_oid_equal(ctx->negotiated_mech_type, &_gss_spnego_krb5_mechanism_oid_desc) &&
gss_oid_equal(ctx->preferred_mech_type, &_gss_spnego_mskrb_mechanism_oid_desc)) {
ctx->flags.safe_omit = 1;
}
return require_mic;
}
static int
add_mech_type(gss_OID mech_type,
int includeMSCompatOID,
MechTypeList *mechtypelist)
{
MechType mech;
int ret;
if (includeMSCompatOID &&
gss_oid_equal(mech_type, &_gss_spnego_krb5_mechanism_oid_desc)) {
ret = der_get_oid(_gss_spnego_mskrb_mechanism_oid_desc.elements,
_gss_spnego_mskrb_mechanism_oid_desc.length,
&mech,
NULL);
if (ret)
return ret;
ret = add_MechTypeList(mechtypelist, &mech);
free_MechType(&mech);
if (ret)
return ret;
}
ret = der_get_oid(mech_type->elements, mech_type->length, &mech, NULL);
if (ret)
return ret;
ret = add_MechTypeList(mechtypelist, &mech);
free_MechType(&mech);
return ret;
}
OM_uint32 GSSAPI_CALLCONV
_gss_spnego_indicate_mechtypelist(OM_uint32 *minor_status,
gss_name_t target_name,
OM_uint32 (*func)(void *, gss_name_t, const gss_cred_id_t, gss_OID),
void *userctx,
int includeMSCompatOID,
const gss_cred_id_t cred_handle,
MechTypeList *mechtypelist,
gss_OID *preferred_mech)
{
gss_OID_set supported_mechs = GSS_C_NO_OID_SET;
gss_OID first_mech = GSS_C_NO_OID;
OM_uint32 ret, junk;
int present = 0;
size_t i;
mechtypelist->len = 0;
mechtypelist->val = NULL;
if (cred_handle) {
ret = gss_inquire_cred(minor_status,
cred_handle,
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;
}
ret = gss_test_oid_set_member(&junk, GSS_KRB5_MECHANISM, supported_mechs, &present);
if (ret == GSS_S_COMPLETE && present) {
ret = (*func)(userctx, target_name, cred_handle, GSS_KRB5_MECHANISM);
if (ret == GSS_S_COMPLETE) {
ret = add_mech_type(GSS_KRB5_MECHANISM,
includeMSCompatOID,
mechtypelist);
if (!GSS_ERROR(ret)) {
if (includeMSCompatOID)
first_mech = &_gss_spnego_mskrb_mechanism_oid_desc;
else
first_mech = GSS_KRB5_MECHANISM;
}
#ifdef __APPLE_PRIVATE__
(void)add_mech_type(GSS_APPL_LKDC_SUPPORTED, 0, mechtypelist);
#endif
}
}
ret = GSS_S_COMPLETE;
for (i = 0; i < supported_mechs->count; i++) {
OM_uint32 subret;
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 (gss_oid_equal(&supported_mechs->elements[i], GSS_NETLOGON_MECHANISM))
continue;
subret = (*func)(userctx, target_name, cred_handle, &supported_mechs->elements[i]);
if (subret != GSS_S_COMPLETE)
continue;
ret = add_mech_type(&supported_mechs->elements[i],
includeMSCompatOID,
mechtypelist);
if (ret != 0) {
*minor_status = ret;
ret = GSS_S_FAILURE;
break;
}
if (first_mech == GSS_C_NO_OID)
first_mech = &supported_mechs->elements[i];
}
if (mechtypelist->len == 0) {
gss_release_oid_set(minor_status, &supported_mechs);
*minor_status = 0;
return GSS_S_BAD_MECH;
}
if (preferred_mech != NULL) {
*preferred_mech = _gss_mg_support_mechanism(first_mech);
}
gss_release_oid_set(minor_status, &supported_mechs);
return ret;
}
OM_uint32
_gss_spnego_verify_mechtypes_mic(OM_uint32 *minor_status,
gssspnego_ctx ctx,
heim_octet_string *mic)
{
gss_buffer_desc mic_buf;
OM_uint32 major_status;
if (ctx->flags.verified_mic) {
*minor_status = 0;
return GSS_S_DUPLICATE_TOKEN;
}
mic_buf.length = mic->length;
mic_buf.value = mic->data;
major_status = gss_verify_mic(minor_status,
ctx->negotiated_ctx_id,
&ctx->NegTokenInit_mech_types,
&mic_buf,
NULL);
if (major_status == GSS_S_UNAVAILABLE) {
_gss_mg_log(10, "mech doesn't support MIC, allowing anyway");
} else if (major_status) {
return gss_mg_set_error_string(GSS_SPNEGO_MECHANISM,
GSS_S_DEFECTIVE_TOKEN, *minor_status,
"SPNEGO peer sent invalid mechListMIC");
}
ctx->flags.verified_mic = 1;
*minor_status = 0;
return GSS_S_COMPLETE;
}