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schannel.c
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/*
Unix SMB/CIFS implementation.
dcerpc schannel operations
Copyright (C) Andrew Tridgell 2004
Copyright (C) Andrew Bartlett <[email protected]> 2004-2005
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 <tevent.h>
#include "lib/util/tevent_ntstatus.h"
#include "librpc/gen_ndr/ndr_schannel.h"
#include "auth/auth.h"
#include "auth/credentials/credentials.h"
#include "auth/gensec/gensec.h"
#include "auth/gensec/gensec_internal.h"
#include "auth/gensec/gensec_proto.h"
#include "../libcli/auth/schannel.h"
#include "librpc/gen_ndr/dcerpc.h"
#include "param/param.h"
#include "auth/gensec/gensec_toplevel_proto.h"
#include "libds/common/roles.h"
#include "lib/crypto/gnutls_helpers.h"
#include <gnutls/gnutls.h>
#include <gnutls/crypto.h>
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_AUTH
struct schannel_state {
struct gensec_security *gensec;
uint64_t seq_num;
bool initiator;
struct netlogon_creds_CredentialState *creds;
struct auth_user_info_dc *user_info_dc;
};
#define SETUP_SEQNUM(state, buf, initiator) do { \
uint8_t *_buf = buf; \
uint32_t _seq_num_low = (state)->seq_num & UINT32_MAX; \
uint32_t _seq_num_high = (state)->seq_num >> 32; \
if (initiator) { \
_seq_num_high |= 0x80000000; \
} \
RSIVAL(_buf, 0, _seq_num_low); \
RSIVAL(_buf, 4, _seq_num_high); \
} while(0)
static struct schannel_state *netsec_create_state(
struct gensec_security *gensec,
struct netlogon_creds_CredentialState *creds,
bool initiator)
{
struct schannel_state *state;
state = talloc_zero(gensec, struct schannel_state);
if (state == NULL) {
return NULL;
}
state->gensec = gensec;
state->initiator = initiator;
state->creds = netlogon_creds_copy(state, creds);
if (state->creds == NULL) {
talloc_free(state);
return NULL;
}
gensec->private_data = state;
return state;
}
static void netsec_offset_and_sizes(struct schannel_state *state,
bool do_seal,
uint32_t *_min_sig_size,
uint32_t *_used_sig_size,
uint32_t *_checksum_length,
uint32_t *_confounder_ofs)
{
uint32_t min_sig_size;
uint32_t used_sig_size;
uint32_t checksum_length;
uint32_t confounder_ofs;
if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
min_sig_size = 48;
used_sig_size = 56;
/*
* Note: windows has a bug here and uses the old values...
*
* checksum_length = 32;
* confounder_ofs = 48;
*/
checksum_length = 8;
confounder_ofs = 24;
} else {
min_sig_size = 24;
used_sig_size = 32;
checksum_length = 8;
confounder_ofs = 24;
}
if (do_seal) {
min_sig_size += 8;
}
if (_min_sig_size) {
*_min_sig_size = min_sig_size;
}
if (_used_sig_size) {
*_used_sig_size = used_sig_size;
}
if (_checksum_length) {
*_checksum_length = checksum_length;
}
if (_confounder_ofs) {
*_confounder_ofs = confounder_ofs;
}
}
/*******************************************************************
Encode or Decode the sequence number (which is symmetric)
********************************************************************/
static NTSTATUS netsec_do_seq_num(struct schannel_state *state,
const uint8_t *checksum,
uint32_t checksum_length,
uint8_t seq_num[8])
{
if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
gnutls_cipher_hd_t cipher_hnd = NULL;
gnutls_datum_t key = {
.data = state->creds->session_key,
.size = sizeof(state->creds->session_key),
};
uint32_t iv_size =
gnutls_cipher_get_iv_size(GNUTLS_CIPHER_AES_128_CFB8);
uint8_t _iv[iv_size];
gnutls_datum_t iv = {
.data = _iv,
.size = iv_size,
};
int rc;
ZERO_ARRAY(_iv);
memcpy(iv.data + 0, checksum, 8);
memcpy(iv.data + 8, checksum, 8);
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_AES_128_CFB8,
&key,
&iv);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc,
NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
rc = gnutls_cipher_encrypt(cipher_hnd, seq_num, 8);
gnutls_cipher_deinit(cipher_hnd);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc,
NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
} else {
static const uint8_t zeros[4];
uint8_t _sequence_key[16];
gnutls_cipher_hd_t cipher_hnd;
gnutls_datum_t sequence_key = {
.data = _sequence_key,
.size = sizeof(_sequence_key),
};
uint8_t digest1[16];
int rc;
rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
state->creds->session_key,
sizeof(state->creds->session_key),
zeros,
sizeof(zeros),
digest1);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
digest1,
sizeof(digest1),
checksum,
checksum_length,
_sequence_key);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
ZERO_ARRAY(digest1);
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_ARCFOUR_128,
&sequence_key,
NULL);
if (rc < 0) {
ZERO_ARRAY(_sequence_key);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_cipher_encrypt(cipher_hnd,
seq_num,
8);
gnutls_cipher_deinit(cipher_hnd);
ZERO_ARRAY(_sequence_key);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
}
state->seq_num++;
return NT_STATUS_OK;
}
static NTSTATUS netsec_do_seal(struct schannel_state *state,
const uint8_t seq_num[8],
uint8_t confounder[8],
uint8_t *data, uint32_t length,
bool forward)
{
if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
gnutls_cipher_hd_t cipher_hnd = NULL;
uint8_t sess_kf0[16] = {0};
gnutls_datum_t key = {
.data = sess_kf0,
.size = sizeof(sess_kf0),
};
uint32_t iv_size =
gnutls_cipher_get_iv_size(GNUTLS_CIPHER_AES_128_CFB8);
uint8_t _iv[iv_size];
gnutls_datum_t iv = {
.data = _iv,
.size = iv_size,
};
uint32_t i;
int rc;
for (i = 0; i < key.size; i++) {
key.data[i] = state->creds->session_key[i] ^ 0xf0;
}
ZERO_ARRAY(_iv);
memcpy(iv.data + 0, seq_num, 8);
memcpy(iv.data + 8, seq_num, 8);
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_AES_128_CFB8,
&key,
&iv);
if (rc < 0) {
DBG_ERR("ERROR: gnutls_cipher_init: %s\n",
gnutls_strerror(rc));
return NT_STATUS_NO_MEMORY;
}
if (forward) {
rc = gnutls_cipher_encrypt(cipher_hnd,
confounder,
8);
if (rc < 0) {
gnutls_cipher_deinit(cipher_hnd);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
rc = gnutls_cipher_encrypt(cipher_hnd,
data,
length);
if (rc < 0) {
gnutls_cipher_deinit(cipher_hnd);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
} else {
/*
* Workaround bug present in gnutls 3.6.8:
*
* gnutls_cipher_decrypt() uses an optimization
* internally that breaks decryption when processing
* buffers with their length not being a multiple
* of the blocksize.
*/
uint8_t tmp[16] = { 0, };
uint32_t tmp_dlength = MIN(length, sizeof(tmp) - 8);
memcpy(tmp, confounder, 8);
memcpy(tmp + 8, data, tmp_dlength);
rc = gnutls_cipher_decrypt(cipher_hnd,
tmp,
8 + tmp_dlength);
if (rc < 0) {
ZERO_STRUCT(tmp);
gnutls_cipher_deinit(cipher_hnd);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
memcpy(confounder, tmp, 8);
memcpy(data, tmp + 8, tmp_dlength);
ZERO_STRUCT(tmp);
if (length > tmp_dlength) {
rc = gnutls_cipher_decrypt(cipher_hnd,
data + tmp_dlength,
length - tmp_dlength);
if (rc < 0) {
gnutls_cipher_deinit(cipher_hnd);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
}
}
gnutls_cipher_deinit(cipher_hnd);
} else {
gnutls_cipher_hd_t cipher_hnd;
uint8_t _sealing_key[16];
gnutls_datum_t sealing_key = {
.data = _sealing_key,
.size = sizeof(_sealing_key),
};
static const uint8_t zeros[4];
uint8_t digest2[16];
uint8_t sess_kf0[16];
int rc;
int i;
for (i = 0; i < 16; i++) {
sess_kf0[i] = state->creds->session_key[i] ^ 0xf0;
}
rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
sess_kf0,
sizeof(sess_kf0),
zeros,
4,
digest2);
if (rc < 0) {
ZERO_ARRAY(digest2);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
digest2,
sizeof(digest2),
seq_num,
8,
_sealing_key);
ZERO_ARRAY(digest2);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_ARCFOUR_128,
&sealing_key,
NULL);
if (rc < 0) {
ZERO_ARRAY(_sealing_key);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
rc = gnutls_cipher_encrypt(cipher_hnd,
confounder,
8);
if (rc < 0) {
ZERO_ARRAY(_sealing_key);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
gnutls_cipher_deinit(cipher_hnd);
rc = gnutls_cipher_init(&cipher_hnd,
GNUTLS_CIPHER_ARCFOUR_128,
&sealing_key,
NULL);
if (rc < 0) {
ZERO_ARRAY(_sealing_key);
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
rc = gnutls_cipher_encrypt(cipher_hnd,
data,
length);
gnutls_cipher_deinit(cipher_hnd);
ZERO_ARRAY(_sealing_key);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
}
}
return NT_STATUS_OK;
}
/*******************************************************************
Create a digest over the entire packet (including the data), and
MD5 it with the session key.
********************************************************************/
static NTSTATUS netsec_do_sign(struct schannel_state *state,
const uint8_t *confounder,
const uint8_t *data, size_t length,
uint8_t header[8],
uint8_t *checksum)
{
if (state->creds->negotiate_flags & NETLOGON_NEG_SUPPORTS_AES) {
gnutls_hmac_hd_t hmac_hnd = NULL;
int rc;
rc = gnutls_hmac_init(&hmac_hnd,
GNUTLS_MAC_SHA256,
state->creds->session_key,
sizeof(state->creds->session_key));
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
if (confounder) {
SSVAL(header, 0, NL_SIGN_HMAC_SHA256);
SSVAL(header, 2, NL_SEAL_AES128);
SSVAL(header, 4, 0xFFFF);
SSVAL(header, 6, 0x0000);
rc = gnutls_hmac(hmac_hnd, header, 8);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_hmac(hmac_hnd, confounder, 8);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
} else {
SSVAL(header, 0, NL_SIGN_HMAC_SHA256);
SSVAL(header, 2, NL_SEAL_NONE);
SSVAL(header, 4, 0xFFFF);
SSVAL(header, 6, 0x0000);
rc = gnutls_hmac(hmac_hnd, header, 8);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
}
rc = gnutls_hmac(hmac_hnd, data, length);
if (rc < 0) {
gnutls_hmac_deinit(hmac_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
gnutls_hmac_deinit(hmac_hnd, checksum);
} else {
uint8_t packet_digest[16];
static const uint8_t zeros[4];
gnutls_hash_hd_t hash_hnd = NULL;
int rc;
rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_MD5);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_hash(hash_hnd, zeros, sizeof(zeros));
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
if (confounder) {
SSVAL(header, 0, NL_SIGN_HMAC_MD5);
SSVAL(header, 2, NL_SEAL_RC4);
SSVAL(header, 4, 0xFFFF);
SSVAL(header, 6, 0x0000);
rc = gnutls_hash(hash_hnd, header, 8);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
rc = gnutls_hash(hash_hnd, confounder, 8);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
} else {
SSVAL(header, 0, NL_SIGN_HMAC_MD5);
SSVAL(header, 2, NL_SEAL_NONE);
SSVAL(header, 4, 0xFFFF);
SSVAL(header, 6, 0x0000);
rc = gnutls_hash(hash_hnd, header, 8);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
}
rc = gnutls_hash(hash_hnd, data, length);
if (rc < 0) {
gnutls_hash_deinit(hash_hnd, NULL);
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
gnutls_hash_deinit(hash_hnd, packet_digest);
rc = gnutls_hmac_fast(GNUTLS_MAC_MD5,
state->creds->session_key,
sizeof(state->creds->session_key),
packet_digest,
sizeof(packet_digest),
checksum);
ZERO_ARRAY(packet_digest);
if (rc < 0) {
return gnutls_error_to_ntstatus(rc, NT_STATUS_HMAC_NOT_SUPPORTED);
}
}
return NT_STATUS_OK;
}
static NTSTATUS netsec_incoming_packet(struct schannel_state *state,
bool do_unseal,
uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
const DATA_BLOB *sig)
{
uint32_t min_sig_size = 0;
uint8_t header[8];
uint8_t checksum[32];
uint32_t checksum_length = sizeof(checksum_length);
uint8_t _confounder[8];
uint8_t *confounder = NULL;
uint32_t confounder_ofs = 0;
uint8_t seq_num[8];
bool ret;
const uint8_t *sign_data = NULL;
size_t sign_length = 0;
NTSTATUS status;
netsec_offset_and_sizes(state,
do_unseal,
&min_sig_size,
NULL,
&checksum_length,
&confounder_ofs);
if (sig->length < min_sig_size) {
return NT_STATUS_ACCESS_DENIED;
}
if (do_unseal) {
confounder = _confounder;
memcpy(confounder, sig->data+confounder_ofs, 8);
} else {
confounder = NULL;
}
SETUP_SEQNUM(state, seq_num, !state->initiator);
if (do_unseal) {
status = netsec_do_seal(state,
seq_num,
confounder,
data,
length,
false);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netsec_do_seal failed: %s\n", nt_errstr(status));
return NT_STATUS_ACCESS_DENIED;
}
}
if (state->gensec->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
sign_data = whole_pdu;
sign_length = pdu_length;
} else {
sign_data = data;
sign_length = length;
}
status = netsec_do_sign(state,
confounder,
sign_data,
sign_length,
header,
checksum);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netsec_do_sign failed: %s\n", nt_errstr(status));
return NT_STATUS_ACCESS_DENIED;
}
ret = mem_equal_const_time(checksum, sig->data+16, checksum_length);
if (!ret) {
dump_data_pw("calc digest:", checksum, checksum_length);
dump_data_pw("wire digest:", sig->data+16, checksum_length);
return NT_STATUS_ACCESS_DENIED;
}
status = netsec_do_seq_num(state, checksum, checksum_length, seq_num);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netsec_do_seq_num failed: %s\n",
nt_errstr(status));
return status;
}
ZERO_ARRAY(checksum);
ret = mem_equal_const_time(seq_num, sig->data+8, 8);
if (!ret) {
dump_data_pw("calc seq num:", seq_num, 8);
dump_data_pw("wire seq num:", sig->data+8, 8);
return NT_STATUS_ACCESS_DENIED;
}
return NT_STATUS_OK;
}
static uint32_t netsec_outgoing_sig_size(struct schannel_state *state)
{
uint32_t sig_size = 0;
netsec_offset_and_sizes(state,
true,
NULL,
&sig_size,
NULL,
NULL);
return sig_size;
}
static NTSTATUS netsec_outgoing_packet(struct schannel_state *state,
TALLOC_CTX *mem_ctx,
bool do_seal,
uint8_t *data, size_t length,
const uint8_t *whole_pdu, size_t pdu_length,
DATA_BLOB *sig)
{
uint32_t min_sig_size = 0;
uint32_t used_sig_size = 0;
uint8_t header[8];
uint8_t checksum[32];
uint32_t checksum_length = sizeof(checksum_length);
uint8_t _confounder[8];
uint8_t *confounder = NULL;
uint32_t confounder_ofs = 0;
uint8_t seq_num[8];
const uint8_t *sign_data = NULL;
size_t sign_length = 0;
NTSTATUS status;
netsec_offset_and_sizes(state,
do_seal,
&min_sig_size,
&used_sig_size,
&checksum_length,
&confounder_ofs);
SETUP_SEQNUM(state, seq_num, state->initiator);
if (do_seal) {
confounder = _confounder;
generate_random_buffer(confounder, 8);
} else {
confounder = NULL;
}
if (state->gensec->want_features & GENSEC_FEATURE_SIGN_PKT_HEADER) {
sign_data = whole_pdu;
sign_length = pdu_length;
} else {
sign_data = data;
sign_length = length;
}
status = netsec_do_sign(state,
confounder,
sign_data,
sign_length,
header,
checksum);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netsec_do_sign failed: %s\n", nt_errstr(status));
return NT_STATUS_ACCESS_DENIED;
}
if (do_seal) {
status = netsec_do_seal(state,
seq_num,
confounder,
data,
length,
true);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netsec_do_seal failed: %s\n",
nt_errstr(status));
return status;
}
}
status = netsec_do_seq_num(state, checksum, checksum_length, seq_num);
if (!NT_STATUS_IS_OK(status)) {
DBG_WARNING("netsec_do_seq_num failed: %s\n",
nt_errstr(status));
return status;
}
(*sig) = data_blob_talloc_zero(mem_ctx, used_sig_size);
memcpy(sig->data, header, 8);
memcpy(sig->data+8, seq_num, 8);
memcpy(sig->data+16, checksum, checksum_length);
if (confounder) {
memcpy(sig->data+confounder_ofs, confounder, 8);
}
dump_data_pw("signature:", sig->data+ 0, 8);
dump_data_pw("seq_num :", sig->data+ 8, 8);
dump_data_pw("digest :", sig->data+16, checksum_length);
dump_data_pw("confound :", sig->data+confounder_ofs, 8);
return NT_STATUS_OK;
}
_PUBLIC_ NTSTATUS gensec_schannel_init(TALLOC_CTX *ctx);
static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
{
struct schannel_state *state =
talloc_get_type_abort(gensec_security->private_data,
struct schannel_state);
return netsec_outgoing_sig_size(state);
}
struct schannel_update_state {
NTSTATUS status;
DATA_BLOB out;
};
static NTSTATUS schannel_update_internal(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out);
static struct tevent_req *schannel_update_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct gensec_security *gensec_security,
const DATA_BLOB in)
{
struct tevent_req *req;
struct schannel_update_state *state = NULL;
NTSTATUS status;
req = tevent_req_create(mem_ctx, &state,
struct schannel_update_state);
if (req == NULL) {
return NULL;
}
status = schannel_update_internal(gensec_security,
state, in,
&state->out);
state->status = status;
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
status = NT_STATUS_OK;
}
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static NTSTATUS schannel_update_internal(struct gensec_security *gensec_security,
TALLOC_CTX *out_mem_ctx,
const DATA_BLOB in, DATA_BLOB *out)
{
struct schannel_state *state =
talloc_get_type(gensec_security->private_data,
struct schannel_state);
NTSTATUS status;
enum ndr_err_code ndr_err;
struct NL_AUTH_MESSAGE bind_schannel = {
.Flags = 0,
};
struct NL_AUTH_MESSAGE bind_schannel_ack;
struct netlogon_creds_CredentialState *creds;
const char *workstation;
const char *domain;
*out = data_blob(NULL, 0);
if (gensec_security->dcerpc_auth_level < DCERPC_AUTH_LEVEL_INTEGRITY) {
switch (gensec_security->gensec_role) {
case GENSEC_CLIENT:
return NT_STATUS_INVALID_PARAMETER_MIX;
case GENSEC_SERVER:
return NT_STATUS_INVALID_PARAMETER;
}
return NT_STATUS_INTERNAL_ERROR;
}
switch (gensec_security->gensec_role) {
case GENSEC_CLIENT:
if (state != NULL) {
/* we could parse the bind ack, but we don't know what it is yet */
return NT_STATUS_OK;
}
creds = cli_credentials_get_netlogon_creds(gensec_security->credentials);
if (creds == NULL) {
return NT_STATUS_INVALID_PARAMETER_MIX;
}
state = netsec_create_state(gensec_security,
creds, true /* initiator */);
if (state == NULL) {
return NT_STATUS_NO_MEMORY;
}
bind_schannel.MessageType = NL_NEGOTIATE_REQUEST;
bind_schannel.Flags = NL_FLAG_OEM_NETBIOS_DOMAIN_NAME |
NL_FLAG_OEM_NETBIOS_COMPUTER_NAME;
bind_schannel.oem_netbios_domain.a = cli_credentials_get_domain(gensec_security->credentials);
bind_schannel.oem_netbios_computer.a = creds->computer_name;
if (creds->secure_channel_type == SEC_CHAN_DNS_DOMAIN) {
bind_schannel.Flags |= NL_FLAG_UTF8_DNS_DOMAIN_NAME;
bind_schannel.utf8_dns_domain.u = cli_credentials_get_realm(gensec_security->credentials);
bind_schannel.Flags |= NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME;
bind_schannel.utf8_netbios_computer.u = creds->computer_name;
}
ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
(ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(3, ("Could not create schannel bind: %s\n",
nt_errstr(status)));
return status;
}
return NT_STATUS_MORE_PROCESSING_REQUIRED;
case GENSEC_SERVER:
if (state != NULL) {
/* no third leg on this protocol */
return NT_STATUS_INVALID_PARAMETER;
}
/* parse the schannel startup blob */
ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
(ndr_pull_flags_fn_t)ndr_pull_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
nt_errstr(status)));
return status;
}
if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_DOMAIN_NAME) {
domain = bind_schannel.oem_netbios_domain.a;
if (strcasecmp_m(domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)) != 0) {
DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
domain, lpcfg_workgroup(gensec_security->settings->lp_ctx)));
return NT_STATUS_LOGON_FAILURE;
}
} else if (bind_schannel.Flags & NL_FLAG_UTF8_DNS_DOMAIN_NAME) {
domain = bind_schannel.utf8_dns_domain.u;
if (strcasecmp_m(domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)) != 0) {
DEBUG(3, ("Request for schannel to incorrect domain: %s != our domain %s\n",
domain, lpcfg_dnsdomain(gensec_security->settings->lp_ctx)));
return NT_STATUS_LOGON_FAILURE;
}
} else {
DEBUG(3, ("Request for schannel to without domain\n"));
return NT_STATUS_LOGON_FAILURE;
}
if (bind_schannel.Flags & NL_FLAG_OEM_NETBIOS_COMPUTER_NAME) {
workstation = bind_schannel.oem_netbios_computer.a;
} else if (bind_schannel.Flags & NL_FLAG_UTF8_NETBIOS_COMPUTER_NAME) {
workstation = bind_schannel.utf8_netbios_computer.u;
} else {
DEBUG(3, ("Request for schannel to without netbios workstation\n"));
return NT_STATUS_LOGON_FAILURE;
}
status = schannel_get_creds_state(out_mem_ctx,
gensec_security->settings->lp_ctx,
workstation, &creds);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
workstation, nt_errstr(status)));
if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
return NT_STATUS_LOGON_FAILURE;
}
return status;
}
state = netsec_create_state(gensec_security,
creds, false /* not initiator */);
if (state == NULL) {
return NT_STATUS_NO_MEMORY;
}
status = auth_anonymous_user_info_dc(state,
lpcfg_netbios_name(gensec_security->settings->lp_ctx),
&state->user_info_dc);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
bind_schannel_ack.MessageType = NL_NEGOTIATE_RESPONSE;
bind_schannel_ack.Flags = 0;
bind_schannel_ack.Buffer.dummy = 0x6c0000; /* actually I think
* this does not have
* any meaning here
* - gd */
ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
(ndr_push_flags_fn_t)ndr_push_NL_AUTH_MESSAGE);
if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
status = ndr_map_error2ntstatus(ndr_err);
DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
workstation, nt_errstr(status)));
return status;
}
return NT_STATUS_OK;
}
return NT_STATUS_INVALID_PARAMETER;
}
static NTSTATUS schannel_update_recv(struct tevent_req *req,
TALLOC_CTX *out_mem_ctx,
DATA_BLOB *out)
{
struct schannel_update_state *state =
tevent_req_data(req,
struct schannel_update_state);
NTSTATUS status;
*out = data_blob_null;
if (tevent_req_is_nterror(req, &status)) {
tevent_req_received(req);
return status;
}
status = state->status;
talloc_steal(out_mem_ctx, state->out.data);
*out = state->out;
tevent_req_received(req);
return status;
}
/**
* Returns anonymous credentials for schannel, matching Win2k3.
*
*/
static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
TALLOC_CTX *mem_ctx,
struct auth_session_info **_session_info)
{
struct schannel_state *state =
talloc_get_type(gensec_security->private_data,
struct schannel_state);
struct auth4_context *auth_ctx = gensec_security->auth_context;
struct auth_session_info *session_info = NULL;
uint32_t session_info_flags = 0;
NTSTATUS status;
if (auth_ctx == NULL) {
DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));