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c64e6e0a0f
metze Signed-off-by: Günther Deschner <gd@samba.org>
422 lines
13 KiB
C
422 lines
13 KiB
C
/*
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Unix SMB/Netbios implementation.
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Version 3.0
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handle NLTMSSP, client server side parsing
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Copyright (C) Andrew Tridgell 2001
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Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
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Copyright (C) Stefan Metzmacher 2005
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "auth/ntlmssp/ntlmssp.h"
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#include "../libcli/auth/libcli_auth.h"
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#include "librpc/gen_ndr/ndr_dcerpc.h"
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#include "auth/gensec/gensec.h"
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#include "auth/gensec/gensec_proto.h"
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/**
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* Callbacks for NTLMSSP - for both client and server operating modes
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*
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*/
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static const struct ntlmssp_callbacks {
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enum ntlmssp_role role;
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enum ntlmssp_message_type command;
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NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
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TALLOC_CTX *out_mem_ctx,
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DATA_BLOB in, DATA_BLOB *out);
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} ntlmssp_callbacks[] = {
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{
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.role = NTLMSSP_CLIENT,
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.command = NTLMSSP_INITIAL,
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.sync_fn = ntlmssp_client_initial,
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},{
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.role = NTLMSSP_SERVER,
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.command = NTLMSSP_NEGOTIATE,
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.sync_fn = ntlmssp_server_negotiate,
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},{
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.role = NTLMSSP_CLIENT,
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.command = NTLMSSP_CHALLENGE,
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.sync_fn = ntlmssp_client_challenge,
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},{
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.role = NTLMSSP_SERVER,
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.command = NTLMSSP_AUTH,
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.sync_fn = ntlmssp_server_auth,
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}
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};
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/**
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* Print out the NTLMSSP flags for debugging
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* @param neg_flags The flags from the packet
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*/
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void debug_ntlmssp_flags(uint32_t neg_flags)
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{
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DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
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if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
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if (neg_flags & NTLMSSP_REQUEST_TARGET)
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DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DATAGRAM\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
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if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
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DEBUGADD(4, (" NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_TARGET_INFO\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_128)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
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if (neg_flags & NTLMSSP_NEGOTIATE_56)
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DEBUGADD(4, (" NTLMSSP_NEGOTIATE_56\n"));
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}
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static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
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const DATA_BLOB *first_packet)
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{
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if (first_packet->length > 8 && memcmp("NTLMSSP\0", first_packet->data, 8) == 0) {
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return NT_STATUS_OK;
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} else {
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return NT_STATUS_INVALID_PARAMETER;
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}
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}
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static NTSTATUS gensec_ntlmssp_update_find(struct ntlmssp_state *ntlmssp_state,
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const DATA_BLOB input, uint32_t *idx)
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{
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struct gensec_ntlmssp_context *gensec_ntlmssp =
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talloc_get_type_abort(ntlmssp_state->callback_private,
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struct gensec_ntlmssp_context);
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struct gensec_security *gensec_security = gensec_ntlmssp->gensec_security;
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uint32_t ntlmssp_command;
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uint32_t i;
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if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
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/* We are strict here because other modules, which we
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* don't fully control (such as GSSAPI) are also
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* strict, but are tested less often */
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DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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if (!input.length) {
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switch (ntlmssp_state->role) {
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case NTLMSSP_CLIENT:
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ntlmssp_command = NTLMSSP_INITIAL;
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break;
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case NTLMSSP_SERVER:
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if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
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/* 'datagram' mode - no neg packet */
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ntlmssp_command = NTLMSSP_NEGOTIATE;
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} else {
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/* This is normal in SPNEGO mech negotiation fallback */
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DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
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return NT_STATUS_INVALID_PARAMETER;
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}
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break;
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}
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} else {
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if (!msrpc_parse(ntlmssp_state,
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&input, "Cd",
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"NTLMSSP",
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&ntlmssp_command)) {
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DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
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dump_data(2, input.data, input.length);
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return NT_STATUS_INVALID_PARAMETER;
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}
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}
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if (ntlmssp_command != ntlmssp_state->expected_state) {
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DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
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return NT_STATUS_INVALID_PARAMETER;
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}
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for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
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if (ntlmssp_callbacks[i].role == ntlmssp_state->role &&
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ntlmssp_callbacks[i].command == ntlmssp_command) {
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*idx = i;
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return NT_STATUS_OK;
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}
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}
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DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
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ntlmssp_state->role, ntlmssp_command));
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return NT_STATUS_INVALID_PARAMETER;
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}
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/**
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* Next state function for the wrapped NTLMSSP state machine
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*
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* @param gensec_security GENSEC state, initialised to NTLMSSP
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* @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
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* @param in The request, as a DATA_BLOB
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* @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
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* @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
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* or NT_STATUS_OK if the user is authenticated.
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*/
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static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
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TALLOC_CTX *out_mem_ctx,
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const DATA_BLOB input, DATA_BLOB *out)
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{
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struct gensec_ntlmssp_context *gensec_ntlmssp =
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talloc_get_type_abort(gensec_security->private_data,
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struct gensec_ntlmssp_context);
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struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
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NTSTATUS status;
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uint32_t i;
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*out = data_blob(NULL, 0);
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if (!out_mem_ctx) {
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/* if the caller doesn't want to manage/own the memory,
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we can put it on our context */
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out_mem_ctx = ntlmssp_state;
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}
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status = gensec_ntlmssp_update_find(ntlmssp_state, input, &i);
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NT_STATUS_NOT_OK_RETURN(status);
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status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
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NT_STATUS_NOT_OK_RETURN(status);
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return NT_STATUS_OK;
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}
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/**
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* Return the NTLMSSP master session key
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*
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* @param ntlmssp_state NTLMSSP State
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*/
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NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
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DATA_BLOB *session_key)
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{
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struct gensec_ntlmssp_context *gensec_ntlmssp =
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talloc_get_type_abort(gensec_security->private_data,
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struct gensec_ntlmssp_context);
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struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
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if (ntlmssp_state->expected_state != NTLMSSP_DONE) {
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return NT_STATUS_NO_USER_SESSION_KEY;
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}
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if (!ntlmssp_state->session_key.data) {
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return NT_STATUS_NO_USER_SESSION_KEY;
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}
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*session_key = ntlmssp_state->session_key;
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return NT_STATUS_OK;
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}
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void ntlmssp_handle_neg_flags(struct ntlmssp_state *ntlmssp_state,
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uint32_t neg_flags, bool allow_lm)
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{
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if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
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ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
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ntlmssp_state->unicode = true;
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} else {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
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ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
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ntlmssp_state->unicode = false;
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}
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if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm && !ntlmssp_state->use_ntlmv2) {
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/* other end forcing us to use LM */
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ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
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} else {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
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}
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if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
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}
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/* Woop Woop - unknown flag for Windows compatibility...
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What does this really do ? JRA. */
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if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
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ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
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}
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if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
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ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
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}
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}
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static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
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uint32_t feature)
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{
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struct gensec_ntlmssp_context *gensec_ntlmssp =
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talloc_get_type_abort(gensec_security->private_data,
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struct gensec_ntlmssp_context);
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struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
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if (feature & GENSEC_FEATURE_SIGN) {
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if (!ntlmssp_state->session_key.length) {
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return false;
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}
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if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
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return true;
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}
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}
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if (feature & GENSEC_FEATURE_SEAL) {
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if (!ntlmssp_state->session_key.length) {
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return false;
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}
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if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
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return true;
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}
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}
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if (feature & GENSEC_FEATURE_SESSION_KEY) {
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if (ntlmssp_state->session_key.length) {
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return true;
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}
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}
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if (feature & GENSEC_FEATURE_DCE_STYLE) {
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return true;
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}
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if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
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if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
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return true;
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}
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}
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return false;
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}
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NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
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{
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struct gensec_ntlmssp_context *gensec_ntlmssp;
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struct ntlmssp_state *ntlmssp_state;
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gensec_ntlmssp = talloc_zero(gensec_security,
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struct gensec_ntlmssp_context);
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if (!gensec_ntlmssp) {
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return NT_STATUS_NO_MEMORY;
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}
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gensec_ntlmssp->gensec_security = gensec_security;
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ntlmssp_state = talloc_zero(gensec_ntlmssp,
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struct ntlmssp_state);
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if (!ntlmssp_state) {
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return NT_STATUS_NO_MEMORY;
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}
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ntlmssp_state->callback_private = gensec_ntlmssp;
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gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
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gensec_security->private_data = gensec_ntlmssp;
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return NT_STATUS_OK;
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}
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static const char *gensec_ntlmssp_oids[] = {
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GENSEC_OID_NTLMSSP,
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NULL
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};
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static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
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.name = "ntlmssp",
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.sasl_name = "NTLM",
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.auth_type = DCERPC_AUTH_TYPE_NTLMSSP,
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.oid = gensec_ntlmssp_oids,
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.client_start = gensec_ntlmssp_client_start,
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.server_start = gensec_ntlmssp_server_start,
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.magic = gensec_ntlmssp_magic,
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.update = gensec_ntlmssp_update,
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.sig_size = gensec_ntlmssp_sig_size,
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.sign_packet = gensec_ntlmssp_sign_packet,
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.check_packet = gensec_ntlmssp_check_packet,
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.seal_packet = gensec_ntlmssp_seal_packet,
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.unseal_packet = gensec_ntlmssp_unseal_packet,
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.wrap = gensec_ntlmssp_wrap,
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.unwrap = gensec_ntlmssp_unwrap,
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.session_key = gensec_ntlmssp_session_key,
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.session_info = gensec_ntlmssp_session_info,
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.have_feature = gensec_ntlmssp_have_feature,
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.enabled = true,
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.priority = GENSEC_NTLMSSP
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};
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_PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
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{
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NTSTATUS ret;
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ret = gensec_register(&gensec_ntlmssp_security_ops);
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if (!NT_STATUS_IS_OK(ret)) {
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DEBUG(0,("Failed to register '%s' gensec backend!\n",
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gensec_ntlmssp_security_ops.name));
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return ret;
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}
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return ret;
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}
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