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/*
Copyright (C) 2013 Simo Sorce <simo@samba.org>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include "gssapi_ntlmssp.h"
#include "gss_ntlmssp.h"
const gss_OID_desc gssntlm_oid = {
.length = GSS_NTLMSSP_OID_LENGTH,
.elements = discard_const(GSS_NTLMSSP_OID_STRING)
};
uint8_t gssntlm_required_security(int security_level, struct gssntlm_ctx *ctx)
{
uint8_t resp;
/* DC defaults */
resp = SEC_DC_LM_OK | SEC_DC_NTLM_OK | SEC_DC_V2_OK;
switch (security_level) {
case 0:
resp |= SEC_LM_OK | SEC_NTLM_OK;
break;
case 1:
resp |= SEC_LM_OK | SEC_NTLM_OK | SEC_EXT_SEC_OK;
break;
case 2:
resp |= SEC_NTLM_OK | SEC_EXT_SEC_OK;
break;
case 3:
resp |= SEC_V2_ONLY | SEC_EXT_SEC_OK;
break;
case 4:
resp |= SEC_NTLM_OK | SEC_EXT_SEC_OK;
if (ctx->role == GSSNTLM_DOMAIN_CONTROLLER) resp &= ~SEC_DC_LM_OK;
break;
case 5:
if (ctx->role == GSSNTLM_DOMAIN_CONTROLLER) resp = SEC_DC_V2_OK;
resp |= SEC_V2_ONLY | SEC_EXT_SEC_OK;
break;
default:
resp = 0xff;
break;
}
return resp;
}
void gssntlm_set_role(struct gssntlm_ctx *ctx,
int desired, char *nb_domain_name)
{
if (desired == GSSNTLM_CLIENT) {
ctx->role = GSSNTLM_CLIENT;
} else if (nb_domain_name && *nb_domain_name) {
ctx->role = GSSNTLM_DOMAIN_SERVER;
} else {
ctx->role = GSSNTLM_SERVER;
}
}
bool gssntlm_role_is_client(struct gssntlm_ctx *ctx)
{
return (ctx->role == GSSNTLM_CLIENT);
}
bool gssntlm_role_is_server(struct gssntlm_ctx *ctx)
{
switch (ctx->role) {
case GSSNTLM_SERVER:
case GSSNTLM_DOMAIN_SERVER:
case GSSNTLM_DOMAIN_CONTROLLER:
return true;
default:
break;
}
return false;
}
bool gssntlm_sec_lm_ok(struct gssntlm_ctx *ctx)
{
switch (ctx->role) {
case GSSNTLM_CLIENT:
case GSSNTLM_SERVER:
return (ctx->sec_req & SEC_LM_OK);
case GSSNTLM_DOMAIN_SERVER:
return true; /* defer decision to DC */
case GSSNTLM_DOMAIN_CONTROLLER:
return (ctx->sec_req & SEC_DC_LM_OK);
}
return false;
}
bool gssntlm_sec_ntlm_ok(struct gssntlm_ctx *ctx)
{
switch (ctx->role) {
case GSSNTLM_CLIENT:
case GSSNTLM_SERVER:
return (ctx->sec_req & SEC_NTLM_OK);
case GSSNTLM_DOMAIN_SERVER:
return true; /* defer decision to DC */
case GSSNTLM_DOMAIN_CONTROLLER:
return (ctx->sec_req & SEC_DC_NTLM_OK);
}
return false;
}
bool gssntlm_ext_sec_ok(struct gssntlm_ctx *ctx)
{
return (ctx->sec_req & SEC_EXT_SEC_OK);
}
uint32_t gssntlm_context_is_valid(struct gssntlm_ctx *ctx, time_t *time_now)
{
time_t now;
if (!ctx) return GSS_S_NO_CONTEXT;
if (!(ctx->int_flags & NTLMSSP_CTX_FLAG_ESTABLISHED)) {
return GSS_S_NO_CONTEXT;
}
now = time(NULL);
if (now > ctx->expiration_time) return GSS_S_CONTEXT_EXPIRED;
if (time_now) *time_now = now;
return GSS_S_COMPLETE;
}
int gssntlm_get_lm_compatibility_level(void)
{
const char *envvar;
envvar = getenv("LM_COMPAT_LEVEL");
if (envvar != NULL) {
return atoi(envvar);
}
/* use 3 by default for better compatibility */
return 3;
}
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