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/*
Unix SMB/Netbios implementation.
Version 3.0
handle NLTMSSP, client server side parsing
Copyright (C) Andrew Tridgell 2001
Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
Copyright (C) Stefan Metzmacher 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
struct auth_session_info;
#include "includes.h"
#include "auth/ntlmssp/ntlmssp.h"
#include "auth/ntlmssp/ntlmssp_private.h"
#include "../libcli/auth/libcli_auth.h"
#include "librpc/gen_ndr/ndr_dcerpc.h"
#include "auth/gensec/gensec.h"
/**
* Callbacks for NTLMSSP - for both client and server operating modes
*
*/
static const struct ntlmssp_callbacks {
enum ntlmssp_role role;
enum ntlmssp_message_type command;
NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB in, DATA_BLOB *out);
} ntlmssp_callbacks[] = {
{
.role = NTLMSSP_CLIENT,
.command = NTLMSSP_INITIAL,
.sync_fn = ntlmssp_client_initial,
},{
.role = NTLMSSP_SERVER,
.command = NTLMSSP_NEGOTIATE,
.sync_fn = gensec_ntlmssp_server_negotiate,
},{
.role = NTLMSSP_CLIENT,
.command = NTLMSSP_CHALLENGE,
.sync_fn = ntlmssp_client_challenge,
},{
.role = NTLMSSP_SERVER,
.command = NTLMSSP_AUTH,
.sync_fn = gensec_ntlmssp_server_auth,
}
};
static NTSTATUS gensec_ntlmssp_update_find(struct ntlmssp_state *ntlmssp_state,
const DATA_BLOB input, uint32_t *idx)
{
struct gensec_ntlmssp_context *gensec_ntlmssp =
talloc_get_type_abort(ntlmssp_state->callback_private,
struct gensec_ntlmssp_context);
struct gensec_security *gensec_security = gensec_ntlmssp->gensec_security;
uint32_t ntlmssp_command;
uint32_t i;
if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
/* We are strict here because other modules, which we
* don't fully control (such as GSSAPI) are also
* strict, but are tested less often */
DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (!input.length) {
switch (ntlmssp_state->role) {
case NTLMSSP_CLIENT:
ntlmssp_command = NTLMSSP_INITIAL;
break;
case NTLMSSP_SERVER:
if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
/* 'datagram' mode - no neg packet */
ntlmssp_command = NTLMSSP_NEGOTIATE;
} else {
/* This is normal in SPNEGO mech negotiation fallback */
DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
return NT_STATUS_INVALID_PARAMETER;
}
break;
}
} else {
if (!msrpc_parse(ntlmssp_state,
&input, "Cd",
"NTLMSSP",
&ntlmssp_command)) {
DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
dump_data(2, input.data, input.length);
return NT_STATUS_INVALID_PARAMETER;
}
}
if (ntlmssp_command != ntlmssp_state->expected_state) {
DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
return NT_STATUS_INVALID_PARAMETER;
}
for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
if (ntlmssp_callbacks[i].role == ntlmssp_state->role &&
ntlmssp_callbacks[i].command == ntlmssp_command) {
*idx = i;
return NT_STATUS_OK;
}
}
DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
ntlmssp_state->role, ntlmssp_command));
return NT_STATUS_INVALID_PARAMETER;
}
/**
* Next state function for the wrapped NTLMSSP state machine
*
* @param gensec_security GENSEC state, initialised to NTLMSSP
* @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
* @param in The request, as a DATA_BLOB
* @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
* @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
* or NT_STATUS_OK if the user is authenticated.
*/
static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
struct tevent_context *ev,
const DATA_BLOB input, DATA_BLOB *out)
{
struct gensec_ntlmssp_context *gensec_ntlmssp =
talloc_get_type_abort(gensec_security->private_data,
struct gensec_ntlmssp_context);
struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
NTSTATUS status;
uint32_t i;
*out = data_blob(NULL, 0);
if (!out_mem_ctx) {
/* if the caller doesn't want to manage/own the memory,
we can put it on our context */
out_mem_ctx = ntlmssp_state;
}
status = gensec_ntlmssp_update_find(ntlmssp_state, input, &i);
NT_STATUS_NOT_OK_RETURN(status);
status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
NT_STATUS_NOT_OK_RETURN(status);
return NT_STATUS_OK;
}
static const char *gensec_ntlmssp_oids[] = {
GENSEC_OID_NTLMSSP,
NULL
};
static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
.name = "ntlmssp",
.sasl_name = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
.auth_type = DCERPC_AUTH_TYPE_NTLMSSP,
.oid = gensec_ntlmssp_oids,
.client_start = gensec_ntlmssp_client_start,
.server_start = gensec_ntlmssp_server_start,
.magic = gensec_ntlmssp_magic,
.update = gensec_ntlmssp_update,
.sig_size = gensec_ntlmssp_sig_size,
.sign_packet = gensec_ntlmssp_sign_packet,
.check_packet = gensec_ntlmssp_check_packet,
.seal_packet = gensec_ntlmssp_seal_packet,
.unseal_packet = gensec_ntlmssp_unseal_packet,
.wrap = gensec_ntlmssp_wrap,
.unwrap = gensec_ntlmssp_unwrap,
.session_key = gensec_ntlmssp_session_key,
.session_info = gensec_ntlmssp_session_info,
.have_feature = gensec_ntlmssp_have_feature,
.enabled = true,
.priority = GENSEC_NTLMSSP
};
_PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
{
NTSTATUS ret;
ret = gensec_register(&gensec_ntlmssp_security_ops);
if (!NT_STATUS_IS_OK(ret)) {
DEBUG(0,("Failed to register '%s' gensec backend!\n",
gensec_ntlmssp_security_ops.name));
return ret;
}
return ret;
}
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