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samba-mirror/auth/ntlmssp/ntlmssp_client.c

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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 "../libcli/auth/libcli_auth.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "param/param.h"
#include "auth/ntlmssp/ntlmssp_private.h"
#include "../librpc/gen_ndr/ndr_ntlmssp.h"
#include "../auth/ntlmssp/ntlmssp_ndr.h"
#include "../nsswitch/libwbclient/wbclient.h"
#include "lib/crypto/gnutls_helpers.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
/*********************************************************************
Client side NTLMSSP
*********************************************************************/
/**
* Next state function for the Initial packet
*
* @param ntlmssp_state NTLMSSP State
* @param out_mem_ctx The DATA_BLOB *out will be allocated on this context
* @param in A NULL data blob (input ignored)
* @param out The initial negotiate request to the server, as an talloc()ed DATA_BLOB, on out_mem_ctx
* @return Errors or NT_STATUS_OK.
*/
NTSTATUS ntlmssp_client_initial(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB in, 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;
const DATA_BLOB version_blob = ntlmssp_version_blob();
/* generate the ntlmssp negotiate packet */
status = msrpc_gen(out_mem_ctx,
out, "CddAAb",
"NTLMSSP",
NTLMSSP_NEGOTIATE,
ntlmssp_state->neg_flags,
"", /* domain */
"", /* workstation */
version_blob.data, version_blob.length);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(0, ("ntlmssp_client_initial: failed to generate "
"ntlmssp negotiate packet\n"));
return status;
}
if (DEBUGLEVEL >= 10) {
struct NEGOTIATE_MESSAGE *negotiate = talloc(
ntlmssp_state, struct NEGOTIATE_MESSAGE);
if (negotiate != NULL) {
status = ntlmssp_pull_NEGOTIATE_MESSAGE(
out, negotiate, negotiate);
if (NT_STATUS_IS_OK(status)) {
NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
negotiate);
}
TALLOC_FREE(negotiate);
}
}
ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state,
*out);
if (ntlmssp_state->negotiate_blob.length != out->length) {
return NT_STATUS_NO_MEMORY;
}
ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
NTSTATUS gensec_ntlmssp_resume_ccache(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB in, 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;
uint32_t neg_flags = 0;
uint32_t ntlmssp_command;
NTSTATUS status;
bool ok;
*out = data_blob_null;
if (in.length == 0) {
/*
* This is compat code for older callers
* which were missing the "initial_blob"/"negotiate_blob".
*
* That means we can't calculate the NTLMSSP_MIC
* field correctly and need to force the
* old_spnego behaviour.
*/
DEBUG(10, ("%s: in.length==%u force_old_spnego!\n",
__func__, (unsigned int)in.length));
ntlmssp_state->force_old_spnego = true;
ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
ntlmssp_state->required_flags = 0;
ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
/* parse the NTLMSSP packet */
if (in.length > UINT16_MAX) {
DEBUG(1, ("%s: reject large request of length %u\n",
__func__, (unsigned int)in.length));
return NT_STATUS_INVALID_PARAMETER;
}
ok = msrpc_parse(ntlmssp_state, &in, "Cdd",
"NTLMSSP",
&ntlmssp_command,
&neg_flags);
if (!ok) {
DEBUG(1, ("%s: failed to parse NTLMSSP Negotiate of length %u\n",
__func__, (unsigned int)in.length));
dump_data(2, in.data, in.length);
return NT_STATUS_INVALID_PARAMETER;
}
if (ntlmssp_command != NTLMSSP_NEGOTIATE) {
DEBUG(1, ("%s: no NTLMSSP Negotiate message (length %u)\n",
__func__, (unsigned int)in.length));
dump_data(2, in.data, in.length);
return NT_STATUS_INVALID_PARAMETER;
}
ntlmssp_state->neg_flags = neg_flags;
DEBUG(3, ("Imported Negotiate flags:\n"));
debug_ntlmssp_flags(neg_flags);
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_UNICODE) {
ntlmssp_state->unicode = true;
} else {
ntlmssp_state->unicode = false;
}
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
gensec_security->want_features |= GENSEC_FEATURE_SIGN;
}
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
gensec_security->want_features |= GENSEC_FEATURE_SEAL;
}
ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;
ntlmssp_state->required_flags = 0;
if (DEBUGLEVEL >= 10) {
struct NEGOTIATE_MESSAGE *negotiate = talloc(
ntlmssp_state, struct NEGOTIATE_MESSAGE);
if (negotiate != NULL) {
status = ntlmssp_pull_NEGOTIATE_MESSAGE(
&in, negotiate, negotiate);
if (NT_STATUS_IS_OK(status)) {
NDR_PRINT_DEBUG(NEGOTIATE_MESSAGE,
negotiate);
}
TALLOC_FREE(negotiate);
}
}
ntlmssp_state->negotiate_blob = data_blob_dup_talloc(ntlmssp_state,
in);
if (ntlmssp_state->negotiate_blob.length != in.length) {
return NT_STATUS_NO_MEMORY;
}
ntlmssp_state->expected_state = NTLMSSP_CHALLENGE;
return NT_STATUS_MORE_PROCESSING_REQUIRED;
}
/**
* Next state function for the Challenge Packet. Generate an auth packet.
*
* @param gensec_security GENSEC state
* @param out_mem_ctx Memory context for *out
* @param in The server challnege, as a DATA_BLOB. reply.data must be NULL
* @param out The next request (auth packet) to the server, as an allocated DATA_BLOB, on the out_mem_ctx context
* @return Errors or NT_STATUS_OK.
*/
NTSTATUS ntlmssp_client_challenge(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, 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;
uint32_t chal_flags, ntlmssp_command, unkn1 = 0, unkn2 = 0;
DATA_BLOB server_domain_blob;
DATA_BLOB challenge_blob;
DATA_BLOB target_info = data_blob(NULL, 0);
char *server_domain;
const char *chal_parse_string;
const char *chal_parse_string_short = NULL;
const char *auth_gen_string;
DATA_BLOB lm_response = data_blob(NULL, 0);
DATA_BLOB nt_response = data_blob(NULL, 0);
DATA_BLOB session_key = data_blob(NULL, 0);
DATA_BLOB lm_session_key = data_blob(NULL, 0);
DATA_BLOB encrypted_session_key = data_blob(NULL, 0);
NTSTATUS nt_status;
int flags = 0;
const char *user = NULL, *domain = NULL, *workstation = NULL;
bool is_anonymous = false;
const DATA_BLOB version_blob = ntlmssp_version_blob();
const NTTIME *server_timestamp = NULL;
uint8_t mic_buffer[NTLMSSP_MIC_SIZE] = { 0, };
DATA_BLOB mic_blob = data_blob_const(mic_buffer, sizeof(mic_buffer));
gnutls_hmac_hd_t hmac_hnd = NULL;
int rc;
TALLOC_CTX *mem_ctx = talloc_new(out_mem_ctx);
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (!msrpc_parse(mem_ctx,
&in, "CdBd",
"NTLMSSP",
&ntlmssp_command,
&server_domain_blob,
&chal_flags)) {
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#1)\n"));
dump_data(2, in.data, in.length);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
data_blob_free(&server_domain_blob);
DEBUG(3, ("Got challenge flags:\n"));
debug_ntlmssp_flags(chal_flags);
nt_status = ntlmssp_handle_neg_flags(ntlmssp_state,
chal_flags, "challenge");
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
if (ntlmssp_state->unicode) {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdUdbddB";
} else {
chal_parse_string = "CdUdbdd";
chal_parse_string_short = "CdUdb";
}
auth_gen_string = "CdBBUUUBdbb";
} else {
if (chal_flags & NTLMSSP_NEGOTIATE_TARGET_INFO) {
chal_parse_string = "CdAdbddB";
} else {
chal_parse_string = "CdAdbdd";
chal_parse_string_short = "CdAdb";
}
auth_gen_string = "CdBBAAABdbb";
}
if (!msrpc_parse(mem_ctx,
&in, chal_parse_string,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8,
&unkn1, &unkn2,
&target_info)) {
bool ok = false;
DEBUG(1, ("Failed to parse the NTLMSSP Challenge: (#2)\n"));
if (chal_parse_string_short != NULL) {
/*
* In the case where NTLMSSP_NEGOTIATE_TARGET_INFO
* is not used, some NTLMSSP servers don't return
* the unused unkn1 and unkn2 fields.
* See bug:
* https://bugzilla.samba.org/show_bug.cgi?id=10016
* for packet traces.
* Try and parse again without them.
*/
ok = msrpc_parse(mem_ctx,
&in, chal_parse_string_short,
"NTLMSSP",
&ntlmssp_command,
&server_domain,
&chal_flags,
&challenge_blob, 8);
if (!ok) {
DEBUG(1, ("Failed to short parse "
"the NTLMSSP Challenge: (#2)\n"));
}
}
if (!ok) {
dump_data(2, in.data, in.length);
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
}
if (DEBUGLEVEL >= 10) {
struct CHALLENGE_MESSAGE *challenge =
talloc(ntlmssp_state, struct CHALLENGE_MESSAGE);
if (challenge != NULL) {
NTSTATUS status;
challenge->NegotiateFlags = chal_flags;
status = ntlmssp_pull_CHALLENGE_MESSAGE(
&in, challenge, challenge);
if (NT_STATUS_IS_OK(status)) {
NDR_PRINT_DEBUG(CHALLENGE_MESSAGE,
challenge);
}
TALLOC_FREE(challenge);
}
}
if (chal_flags & NTLMSSP_TARGET_TYPE_SERVER) {
ntlmssp_state->server.is_standalone = true;
} else {
ntlmssp_state->server.is_standalone = false;
}
/* TODO: parse struct_blob and fill in the rest */
ntlmssp_state->server.netbios_name = "";
ntlmssp_state->server.netbios_domain = talloc_move(ntlmssp_state, &server_domain);
ntlmssp_state->server.dns_name = "";
ntlmssp_state->server.dns_domain = "";
if (challenge_blob.length != 8) {
talloc_free(mem_ctx);
return NT_STATUS_INVALID_PARAMETER;
}
is_anonymous = cli_credentials_is_anonymous(gensec_security->credentials);
cli_credentials_get_ntlm_username_domain(gensec_security->credentials, mem_ctx,
&user, &domain);
workstation = cli_credentials_get_workstation(gensec_security->credentials);
if (user == NULL) {
DEBUG(10, ("User is NULL, returning INVALID_PARAMETER\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (domain == NULL) {
DEBUG(10, ("Domain is NULL, returning INVALID_PARAMETER\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (workstation == NULL) {
DEBUG(10, ("Workstation is NULL, returning INVALID_PARAMETER\n"));
return NT_STATUS_INVALID_PARAMETER;
}
if (is_anonymous) {
ntlmssp_state->neg_flags |= NTLMSSP_ANONYMOUS;
/*
* don't use the ccache for anonymous auth
*/
ntlmssp_state->use_ccache = false;
}
if (ntlmssp_state->use_ccache) {
struct samr_Password *nt_hash = NULL;
/*
* If we have a password given we don't
* use the ccache
*/
nt_hash = cli_credentials_get_nt_hash(gensec_security->credentials,
mem_ctx);
if (nt_hash != NULL) {
ZERO_STRUCTP(nt_hash);
TALLOC_FREE(nt_hash);
ntlmssp_state->use_ccache = false;
}
}
if (ntlmssp_state->use_ccache) {
struct wbcCredentialCacheParams params;
struct wbcCredentialCacheInfo *info = NULL;
struct wbcAuthErrorInfo *error = NULL;
struct wbcNamedBlob auth_blobs[2];
const struct wbcBlob *wbc_auth_blob = NULL;
const struct wbcBlob *wbc_session_key = NULL;
wbcErr wbc_status;
int i;
bool new_spnego = false;
params.account_name = user;
params.domain_name = domain;
params.level = WBC_CREDENTIAL_CACHE_LEVEL_NTLMSSP;
auth_blobs[0].name = "challenge_blob";
auth_blobs[0].flags = 0;
auth_blobs[0].blob.data = in.data;
auth_blobs[0].blob.length = in.length;
auth_blobs[1].name = "negotiate_blob";
auth_blobs[1].flags = 0;
auth_blobs[1].blob.data = ntlmssp_state->negotiate_blob.data;
auth_blobs[1].blob.length = ntlmssp_state->negotiate_blob.length;
params.num_blobs = ARRAY_SIZE(auth_blobs);
params.blobs = auth_blobs;
wbc_status = wbcCredentialCache(&params, &info, &error);
wbcFreeMemory(error);
if (!WBC_ERROR_IS_OK(wbc_status)) {
return NT_STATUS_WRONG_CREDENTIAL_HANDLE;
}
for (i=0; i<info->num_blobs; i++) {
if (strequal(info->blobs[i].name, "auth_blob")) {
wbc_auth_blob = &info->blobs[i].blob;
}
if (strequal(info->blobs[i].name, "session_key")) {
wbc_session_key = &info->blobs[i].blob;
}
if (strequal(info->blobs[i].name, "new_spnego")) {
new_spnego = true;
}
}
if ((wbc_auth_blob == NULL) || (wbc_session_key == NULL)) {
wbcFreeMemory(info);
return NT_STATUS_WRONG_CREDENTIAL_HANDLE;
}
session_key = data_blob_talloc(mem_ctx,
wbc_session_key->data,
wbc_session_key->length);
if (session_key.length != wbc_session_key->length) {
wbcFreeMemory(info);
return NT_STATUS_NO_MEMORY;
}
*out = data_blob_talloc(mem_ctx,
wbc_auth_blob->data,
wbc_auth_blob->length);
if (out->length != wbc_auth_blob->length) {
wbcFreeMemory(info);
return NT_STATUS_NO_MEMORY;
}
ntlmssp_state->new_spnego = new_spnego;
wbcFreeMemory(info);
goto done;
}
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
flags |= CLI_CRED_NTLM2;
}
if (ntlmssp_state->use_ntlmv2) {
flags |= CLI_CRED_NTLMv2_AUTH;
}
if (ntlmssp_state->use_nt_response) {
flags |= CLI_CRED_NTLM_AUTH;
}
if (ntlmssp_state->allow_lm_response) {
flags |= CLI_CRED_LANMAN_AUTH;
}
if (target_info.length != 0 && !is_anonymous) {
struct AV_PAIR *pairs = NULL;
uint32_t count = 0;
enum ndr_err_code err;
struct AV_PAIR *timestamp = NULL;
struct AV_PAIR *eol = NULL;
uint32_t i = 0;
const char *service = NULL;
const char *hostname = NULL;
err = ndr_pull_struct_blob(&target_info,
ntlmssp_state,
&ntlmssp_state->server.av_pair_list,
(ndr_pull_flags_fn_t)ndr_pull_AV_PAIR_LIST);
if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
return ndr_map_error2ntstatus(err);
}
count = ntlmssp_state->server.av_pair_list.count;
/*
* We need room for Flags, SingleHost,
* ChannelBindings and Target
*/
pairs = talloc_zero_array(ntlmssp_state, struct AV_PAIR,
count + 4);
if (pairs == NULL) {
return NT_STATUS_NO_MEMORY;
}
for (i = 0; i < count; i++) {
pairs[i] = ntlmssp_state->server.av_pair_list.pair[i];
}
ntlmssp_state->client.av_pair_list.count = count;
ntlmssp_state->client.av_pair_list.pair = pairs;
eol = ndr_ntlmssp_find_av(&ntlmssp_state->client.av_pair_list,
MsvAvEOL);
if (eol == NULL) {
return NT_STATUS_INVALID_PARAMETER;
}
timestamp = ndr_ntlmssp_find_av(&ntlmssp_state->client.av_pair_list,
MsvAvTimestamp);
if (timestamp != NULL) {
uint32_t sign_features =
GENSEC_FEATURE_SESSION_KEY |
GENSEC_FEATURE_SIGN |
GENSEC_FEATURE_SEAL;
server_timestamp = &timestamp->Value.AvTimestamp;
if (ntlmssp_state->force_old_spnego) {
sign_features = 0;
}
if (gensec_security->want_features & sign_features) {
struct AV_PAIR *av_flags = NULL;
av_flags = ndr_ntlmssp_find_av(&ntlmssp_state->client.av_pair_list,
MsvAvFlags);
if (av_flags == NULL) {
av_flags = eol;
eol++;
count++;
*eol = *av_flags;
av_flags->AvId = MsvAvFlags;
av_flags->Value.AvFlags = 0;
}
av_flags->Value.AvFlags |= NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE;
ntlmssp_state->new_spnego = true;
}
}
{
struct AV_PAIR *SingleHost = NULL;
SingleHost = eol;
eol++;
count++;
*eol = *SingleHost;
/*
* This is not really used, but we want to
* add some more random bytes and match
* Windows.
*/
SingleHost->AvId = MsvAvSingleHost;
SingleHost->Value.AvSingleHost.token_info.Flags = 0;
SingleHost->Value.AvSingleHost.token_info.TokenIL = 0;
generate_random_buffer(SingleHost->Value.AvSingleHost.token_info.MachineId,
sizeof(SingleHost->Value.AvSingleHost.token_info.MachineId));
SingleHost->Value.AvSingleHost.remaining = data_blob_null;
}
{
struct AV_PAIR *ChannelBindings = NULL;
ChannelBindings = eol;
eol++;
count++;
*eol = *ChannelBindings;
/*
* gensec doesn't support channel bindings yet,
* but we want to match Windows on the wire
*/
ChannelBindings->AvId = MsvChannelBindings;
memset(ChannelBindings->Value.ChannelBindings, 0,
sizeof(ChannelBindings->Value.ChannelBindings));
}
service = gensec_get_target_service(gensec_security);
hostname = gensec_get_target_hostname(gensec_security);
if (service != NULL && hostname != NULL) {
struct AV_PAIR *target = NULL;
target = eol;
eol++;
count++;
*eol = *target;
target->AvId = MsvAvTargetName;
target->Value.AvTargetName = talloc_asprintf(pairs, "%s/%s",
service,
hostname);
if (target->Value.AvTargetName == NULL) {
return NT_STATUS_NO_MEMORY;
}
}
ntlmssp_state->client.av_pair_list.count = count;
ntlmssp_state->client.av_pair_list.pair = pairs;
err = ndr_push_struct_blob(&target_info,
ntlmssp_state,
&ntlmssp_state->client.av_pair_list,
(ndr_push_flags_fn_t)ndr_push_AV_PAIR_LIST);
if (!NDR_ERR_CODE_IS_SUCCESS(err)) {
return NT_STATUS_NO_MEMORY;
}
}
nt_status = cli_credentials_get_ntlm_response(gensec_security->credentials, mem_ctx,
&flags, challenge_blob,
server_timestamp, target_info,
&lm_response, &nt_response,
&lm_session_key, &session_key);
if (!NT_STATUS_IS_OK(nt_status)) {
return nt_status;
}
if (!(flags & CLI_CRED_LANMAN_AUTH)) {
/* LM Key is still possible, just silly, so we do not
* allow it. Fortunetly all LM crypto is off by
* default and we require command line options to end
* up here */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_LM_KEY;
}
if (!(flags & CLI_CRED_NTLM2)) {
/* NTLM2 is incompatible... */
ntlmssp_state->neg_flags &= ~NTLMSSP_NEGOTIATE_NTLM2;
}
if ((ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_LM_KEY)
&& ntlmssp_state->allow_lm_key && lm_session_key.length == 16) {
DATA_BLOB new_session_key = data_blob_talloc(mem_ctx, NULL, 16);
if (lm_response.length == 24) {
SMBsesskeygen_lm_sess_key(lm_session_key.data, lm_response.data,
new_session_key.data);
} else {
static const uint8_t zeros[24];
SMBsesskeygen_lm_sess_key(lm_session_key.data, zeros,
new_session_key.data);
}
session_key = new_session_key;
dump_data_pw("LM session key\n", session_key.data, session_key.length);
}
/* Key exchange encryptes a new client-generated session key with
the password-derived key */
if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_KEY_EXCH) {
/* Make up a new session key */
uint8_t client_session_key[16];
gnutls_cipher_hd_t cipher_hnd;
gnutls_datum_t enc_session_key = {
.data = session_key.data,
.size = session_key.length,
};
generate_random_buffer(client_session_key, sizeof(client_session_key));
/* Encrypt the new session key with the old one */
encrypted_session_key = data_blob_talloc(ntlmssp_state,
client_session_key, sizeof(client_session_key));
dump_data_pw("KEY_EXCH session key:\n", encrypted_session_key.data, encrypted_session_key.length);
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_ARCFOUR_128,
&enc_session_key,
NULL);
if (rc < 0) {
nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
ZERO_ARRAY(client_session_key);
goto done;
}
rc = gnutls_cipher_encrypt(cipher_hnd,
encrypted_session_key.data,
encrypted_session_key.length);
gnutls_cipher_deinit(cipher_hnd);
if (rc < 0) {
nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
ZERO_ARRAY(client_session_key);
goto done;
}
dump_data_pw("KEY_EXCH session key (enc):\n", encrypted_session_key.data, encrypted_session_key.length);
/* Mark the new session key as the 'real' session key */
session_key = data_blob_talloc(mem_ctx, client_session_key, sizeof(client_session_key));
ZERO_ARRAY(client_session_key);
}
/* this generates the actual auth packet */
nt_status = msrpc_gen(mem_ctx,
out, auth_gen_string,
"NTLMSSP",
NTLMSSP_AUTH,
lm_response.data, lm_response.length,
nt_response.data, nt_response.length,
domain,
user,
workstation,
encrypted_session_key.data, encrypted_session_key.length,
ntlmssp_state->neg_flags,
version_blob.data, version_blob.length,
mic_blob.data, mic_blob.length);
if (!NT_STATUS_IS_OK(nt_status)) {
talloc_free(mem_ctx);
return nt_status;
}
if (DEBUGLEVEL >= 10) {
struct AUTHENTICATE_MESSAGE *authenticate =
talloc(ntlmssp_state, struct AUTHENTICATE_MESSAGE);
if (authenticate != NULL) {
NTSTATUS status;
authenticate->NegotiateFlags = ntlmssp_state->neg_flags;
status = ntlmssp_pull_AUTHENTICATE_MESSAGE(
out, authenticate, authenticate);
if (NT_STATUS_IS_OK(status)) {
NDR_PRINT_DEBUG(AUTHENTICATE_MESSAGE,
authenticate);
}
TALLOC_FREE(authenticate);
}
}
/*
* We always include the MIC, even without:
* av_flags->Value.AvFlags |= NTLMSSP_AVFLAG_MIC_IN_AUTHENTICATE_MESSAGE;
* ntlmssp_state->new_spnego = true;
*
* This matches a Windows client.
*/
rc = gnutls_hmac_init(&hmac_hnd,
GNUTLS_MAC_MD5,
session_key.data,
MIN(session_key.length, 64));
if (rc < 0) {
nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
goto done;
}
rc = gnutls_hmac(hmac_hnd,
ntlmssp_state->negotiate_blob.data,
ntlmssp_state->negotiate_blob.length);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
goto done;
}
rc = gnutls_hmac(hmac_hnd, in.data, in.length);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
goto done;
}
rc = gnutls_hmac(hmac_hnd, out->data, out->length);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
nt_status = gnutls_error_to_ntstatus(rc, NT_STATUS_NTLM_BLOCKED);
goto done;
}
gnutls_hmac_deinit(hmac_hnd, mic_buffer);
memcpy(out->data + NTLMSSP_MIC_OFFSET, mic_buffer, NTLMSSP_MIC_SIZE);
ZERO_ARRAY(mic_buffer);
nt_status = NT_STATUS_OK;
done:
ZERO_ARRAY_LEN(ntlmssp_state->negotiate_blob.data,
ntlmssp_state->negotiate_blob.length);
data_blob_free(&ntlmssp_state->negotiate_blob);
ntlmssp_state->session_key = session_key;
talloc_steal(ntlmssp_state, session_key.data);
DEBUG(3, ("NTLMSSP: Set final flags:\n"));
debug_ntlmssp_flags(ntlmssp_state->neg_flags);
talloc_steal(out_mem_ctx, out->data);
ntlmssp_state->expected_state = NTLMSSP_DONE;
if (gensec_ntlmssp_have_feature(gensec_security, GENSEC_FEATURE_SIGN)) {
nt_status = ntlmssp_sign_init(ntlmssp_state);
if (!NT_STATUS_IS_OK(nt_status)) {
DEBUG(1, ("Could not setup NTLMSSP signing/sealing system (error was: %s)\n",
nt_errstr(nt_status)));
talloc_free(mem_ctx);
return nt_status;
}
}
talloc_free(mem_ctx);
return nt_status;
}
NTSTATUS gensec_ntlmssp_client_start(struct gensec_security *gensec_security)
{
struct gensec_ntlmssp_context *gensec_ntlmssp;
struct ntlmssp_state *ntlmssp_state;
NTSTATUS nt_status;
nt_status = gensec_ntlmssp_start(gensec_security);
NT_STATUS_NOT_OK_RETURN(nt_status);
gensec_ntlmssp =
talloc_get_type_abort(gensec_security->private_data,
struct gensec_ntlmssp_context);
ntlmssp_state = talloc_zero(gensec_ntlmssp,
struct ntlmssp_state);
if (!ntlmssp_state) {
return NT_STATUS_NO_MEMORY;
}
gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
ntlmssp_state->role = NTLMSSP_CLIENT;
ntlmssp_state->client.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
ntlmssp_state->client.netbios_name = cli_credentials_get_workstation(gensec_security->credentials);
ntlmssp_state->unicode = gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "unicode", true);
ntlmssp_state->use_nt_response = \
gensec_setting_bool(gensec_security->settings,
"ntlmssp_client",
"send_nt_response",
true);
ntlmssp_state->allow_lm_response = lpcfg_client_lanman_auth(gensec_security->settings->lp_ctx);
ntlmssp_state->allow_lm_key = (ntlmssp_state->allow_lm_response
&& (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "allow_lm_key", false)
|| gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)));
ntlmssp_state->use_ntlmv2 = lpcfg_client_ntlmv2_auth(gensec_security->settings->lp_ctx);
ntlmssp_state->force_old_spnego = gensec_setting_bool(gensec_security->settings,
"ntlmssp_client", "force_old_spnego", false);
ntlmssp_state->expected_state = NTLMSSP_INITIAL;
ntlmssp_state->neg_flags =
NTLMSSP_NEGOTIATE_NTLM |
NTLMSSP_NEGOTIATE_VERSION |
NTLMSSP_REQUEST_TARGET;
if (ntlmssp_state->unicode) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_UNICODE;
} else {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_OEM;
}
if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "128bit", true)) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
}
if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "56bit", false)) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
}
if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "lm_key", false)) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
}
if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "keyexchange", true)) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
}
if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "alwayssign", true)) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
}
if (gensec_setting_bool(gensec_security->settings, "ntlmssp_client", "ntlm2", true)) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
} else {
/* apparently we can't do ntlmv2 if we don't do ntlm2 */
ntlmssp_state->use_ntlmv2 = false;
}
if (ntlmssp_state->use_ntlmv2) {
ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_NTLM2;
ntlmssp_state->allow_lm_response = false;
ntlmssp_state->allow_lm_key = false;
}
if (ntlmssp_state->allow_lm_key) {
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
}
if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
/*
* We need to set this to allow a later SetPassword
* via the SAMR pipe to succeed. Strange.... We could
* also add NTLMSSP_NEGOTIATE_SEAL here. JRA.
*
* Without this, Windows will not create the master key
* that it thinks is only used for NTLMSSP signing and
* sealing. (It is actually pulled out and used directly)
*
* We don't require this here as some servers (e.g. NetAPP)
* doesn't support this.
*/
ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
}
if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SIGN;
if (gensec_security->want_features & GENSEC_FEATURE_LDAP_STYLE) {
/*
* We need to handle NTLMSSP_NEGOTIATE_SIGN as
* NTLMSSP_NEGOTIATE_SEAL if GENSEC_FEATURE_LDAP_STYLE
* is requested.
*/
ntlmssp_state->force_wrap_seal = true;
}
}
if (ntlmssp_state->force_wrap_seal) {
bool ret;
/*
* We want also work against old Samba servers
* which didn't had GENSEC_FEATURE_LDAP_STYLE
* we negotiate SEAL too. We may remove this
* in a few years. As all servers should have
* GENSEC_FEATURE_LDAP_STYLE by then.
*/
ret = gensec_setting_bool(gensec_security->settings,
"ntlmssp_client",
"ldap_style_send_seal",
true);
if (ret) {
ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SEAL;
}
}
if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SIGN;
ntlmssp_state->required_flags |= NTLMSSP_NEGOTIATE_SEAL;
}
if (gensec_security->want_features & GENSEC_FEATURE_NTLM_CCACHE) {
ntlmssp_state->use_ccache = true;
}
ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;
return NT_STATUS_OK;
}
NTSTATUS gensec_ntlmssp_resume_ccache_start(struct gensec_security *gensec_security)
{
struct gensec_ntlmssp_context *gensec_ntlmssp = NULL;
NTSTATUS status;
status = gensec_ntlmssp_client_start(gensec_security);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
struct gensec_ntlmssp_context);
gensec_ntlmssp->ntlmssp_state->use_ccache = false;
gensec_ntlmssp->ntlmssp_state->resume_ccache = true;
gensec_ntlmssp->ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
return NT_STATUS_OK;
}