/source4/auth/ntlmssp/ntlmssp.c
C | 439 lines | 314 code | 54 blank | 71 comment | 73 complexity | b0992aa849be66e289caaf7c4f218029 MD5 | raw file
Possible License(s): GPL-3.0
- /*
- 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/>.
- */
- #include "includes.h"
- #include "auth/ntlmssp/ntlmssp.h"
- #include "../libcli/auth/libcli_auth.h"
- #include "librpc/gen_ndr/ndr_dcerpc.h"
- #include "auth/gensec/gensec.h"
- #include "auth/gensec/gensec_proto.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 = ntlmssp_server_negotiate,
- },{
- .role = NTLMSSP_CLIENT,
- .command = NTLMSSP_CHALLENGE,
- .sync_fn = ntlmssp_client_challenge,
- },{
- .role = NTLMSSP_SERVER,
- .command = NTLMSSP_AUTH,
- .sync_fn = ntlmssp_server_auth,
- }
- };
- /**
- * Print out the NTLMSSP flags for debugging
- * @param neg_flags The flags from the packet
- */
- void debug_ntlmssp_flags(uint32_t neg_flags)
- {
- DEBUG(3,("Got NTLMSSP neg_flags=0x%08x\n", neg_flags));
-
- if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_UNICODE\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_OEM)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM\n"));
- if (neg_flags & NTLMSSP_REQUEST_TARGET)
- DEBUGADD(4, (" NTLMSSP_REQUEST_TARGET\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_SIGN)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SIGN\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_SEAL)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_SEAL\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_DATAGRAM)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_DATAGRAM\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_LM_KEY\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_NETWARE)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NETWARE\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_NTLM)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_DOMAIN_SUPPLIED\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_OEM_WORKSTATION_SUPPLIED\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_THIS_IS_LOCAL_CALL\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_ALWAYS_SIGN\n"));
- if (neg_flags & NTLMSSP_REQUEST_NON_NT_SESSION_KEY)
- DEBUGADD(4, (" NTLMSSP_REQUEST_NON_NT_SESSION_KEY\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_NTLM2)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_NTLM2\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_TARGET_INFO)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_TARGET_INFO\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_128)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_128\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_KEY_EXCH\n"));
- if (neg_flags & NTLMSSP_NEGOTIATE_56)
- DEBUGADD(4, (" NTLMSSP_NEGOTIATE_56\n"));
- }
- static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
- const DATA_BLOB *first_packet)
- {
- if (first_packet->length > 8 && memcmp("NTLMSSP\0", first_packet->data, 8) == 0) {
- return NT_STATUS_OK;
- } else {
- return NT_STATUS_INVALID_PARAMETER;
- }
- }
- static NTSTATUS gensec_ntlmssp_update_find(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
- const DATA_BLOB input, uint32_t *idx)
- {
- struct gensec_security *gensec_security = gensec_ntlmssp_state->gensec_security;
- uint32_t ntlmssp_command;
- uint32_t i;
- if (gensec_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 (gensec_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(gensec_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 != gensec_ntlmssp_state->expected_state) {
- DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, gensec_ntlmssp_state->expected_state));
- return NT_STATUS_INVALID_PARAMETER;
- }
- for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
- if (ntlmssp_callbacks[i].role == gensec_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",
- gensec_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,
- const DATA_BLOB input, DATA_BLOB *out)
- {
- struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
- 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 = gensec_ntlmssp_state;
- }
- status = gensec_ntlmssp_update_find(gensec_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;
- }
- /**
- * Return the NTLMSSP master session key
- *
- * @param gensec_ntlmssp_state NTLMSSP State
- */
- NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
- DATA_BLOB *session_key)
- {
- struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
- if (gensec_ntlmssp_state->expected_state != NTLMSSP_DONE) {
- return NT_STATUS_NO_USER_SESSION_KEY;
- }
- if (!gensec_ntlmssp_state->session_key.data) {
- return NT_STATUS_NO_USER_SESSION_KEY;
- }
- *session_key = gensec_ntlmssp_state->session_key;
- return NT_STATUS_OK;
- }
- void ntlmssp_handle_neg_flags(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
- uint32_t neg_flags, bool allow_lm)
- {
- if (neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
- gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_OEM;
- gensec_ntlmssp_state->unicode = true;
- } else {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_UNICODE;
- gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
- gensec_ntlmssp_state->unicode = false;
- }
- if ((neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) && allow_lm && !gensec_ntlmssp_state->use_ntlmv2) {
- /* other end forcing us to use LM */
- gensec_ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
- } else {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_ALWAYS_SIGN)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_SIGN)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SIGN;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_SEAL)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_SEAL;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_NTLM2)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_128)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_128;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_56)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_56;
- }
- if (!(neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_KEY_EXCH;
- }
- /* Woop Woop - unknown flag for Windows compatibility...
- What does this really do ? JRA. */
- if (!(neg_flags & NTLMSSP_NEGOTIATE_VERSION)) {
- gensec_ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_VERSION;
- }
- if ((neg_flags & NTLMSSP_REQUEST_TARGET)) {
- gensec_ntlmssp_state->neg_flags |= NTLMSSP_REQUEST_TARGET;
- }
-
- }
- /**
- Weaken NTLMSSP keys to cope with down-level clients and servers.
- We probably should have some parameters to control this, but as
- it only occours for LM_KEY connections, and this is controlled
- by the client lanman auth/lanman auth parameters, it isn't too bad.
- */
- DATA_BLOB ntlmssp_weakend_key(struct gensec_ntlmssp_state *gensec_ntlmssp_state,
- TALLOC_CTX *mem_ctx)
- {
- DATA_BLOB weakened_key = data_blob_talloc(mem_ctx,
- gensec_ntlmssp_state->session_key.data,
- gensec_ntlmssp_state->session_key.length);
- /* Nothing to weaken. We certainly don't want to 'extend' the length... */
- if (weakened_key.length < 16) {
- /* perhaps there was no key? */
- return weakened_key;
- }
- /* Key weakening not performed on the master key for NTLM2
- and does not occour for NTLM1. Therefore we only need
- to do this for the LM_KEY.
- */
- if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY) {
- /* LM key doesn't support 128 bit crypto, so this is
- * the best we can do. If you negotiate 128 bit, but
- * not 56, you end up with 40 bit... */
- if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_56) {
- weakened_key.data[7] = 0xa0;
- weakened_key.length = 8;
- } else { /* forty bits */
- weakened_key.data[5] = 0xe5;
- weakened_key.data[6] = 0x38;
- weakened_key.data[7] = 0xb0;
- weakened_key.length = 8;
- }
- }
- return weakened_key;
- }
- static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
- uint32_t feature)
- {
- struct gensec_ntlmssp_state *gensec_ntlmssp_state = (struct gensec_ntlmssp_state *)gensec_security->private_data;
- if (feature & GENSEC_FEATURE_SIGN) {
- if (!gensec_ntlmssp_state->session_key.length) {
- return false;
- }
- if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
- return true;
- }
- }
- if (feature & GENSEC_FEATURE_SEAL) {
- if (!gensec_ntlmssp_state->session_key.length) {
- return false;
- }
- if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
- return true;
- }
- }
- if (feature & GENSEC_FEATURE_SESSION_KEY) {
- if (gensec_ntlmssp_state->session_key.length) {
- return true;
- }
- }
- if (feature & GENSEC_FEATURE_DCE_STYLE) {
- return true;
- }
- if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
- if (gensec_ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
- return true;
- }
- }
- return false;
- }
- NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
- {
- struct gensec_ntlmssp_state *gensec_ntlmssp_state;
-
- gensec_ntlmssp_state = talloc_zero(gensec_security, struct gensec_ntlmssp_state);
- if (!gensec_ntlmssp_state) {
- return NT_STATUS_NO_MEMORY;
- }
- gensec_ntlmssp_state->gensec_security = gensec_security;
- gensec_ntlmssp_state->auth_context = NULL;
- gensec_ntlmssp_state->server_info = NULL;
- gensec_security->private_data = gensec_ntlmssp_state;
- 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 = "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;
- }