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/*
Unix SMB/CIFS implementation.
dcerpc schannel operations
Copyright (C) Andrew Tridgell 2004
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*
wrappers for the schannel_*() functions
*/
static NTSTATUS schan_unseal_packet(struct dcerpc_security *dcerpc_security,
uchar *data, size_t length, DATA_BLOB *sig)
{
struct schannel_state *schannel_state = dcerpc_security->private;
return schannel_unseal_packet(schannel_state, data, length, sig);
}
static NTSTATUS schan_check_packet(struct dcerpc_security *dcerpc_security,
const uchar *data, size_t length,
const DATA_BLOB *sig)
{
struct schannel_state *schannel_state = dcerpc_security->private;
return schannel_check_packet(schannel_state, data, length, sig);
}
static NTSTATUS schan_seal_packet(struct dcerpc_security *dcerpc_security,
uchar *data, size_t length,
DATA_BLOB *sig)
{
struct schannel_state *schannel_state = dcerpc_security->private;
return schannel_seal_packet(schannel_state, data, length, sig);
}
static NTSTATUS schan_sign_packet(struct dcerpc_security *dcerpc_security,
const uchar *data, size_t length,
DATA_BLOB *sig)
{
struct schannel_state *schannel_state = dcerpc_security->private;
return schannel_sign_packet(schannel_state, data, length, sig);
}
static void schan_security_end(struct dcerpc_security *dcerpc_security)
{
struct schannel_state *schannel_state = dcerpc_security->private;
return schannel_end(&schannel_state);
}
/*
do a schannel style bind on a dcerpc pipe. The username is usually
of the form HOSTNAME$ and the password is the domain trust password
*/
NTSTATUS dcerpc_bind_auth_schannel(struct dcerpc_pipe *p,
const char *uuid, unsigned version,
const char *domain,
const char *username,
const char *password)
{
NTSTATUS status;
struct dcerpc_pipe *p2;
struct netr_ServerReqChallenge r;
struct netr_ServerAuthenticate2 a;
uint8 mach_pwd[16];
uint8 session_key[16];
struct netr_CredentialState creds;
struct schannel_state *schannel_state;
const char *workgroup, *workstation;
uint32 negotiate_flags = 0;
workstation = username;
workgroup = domain;
/*
step 1 - establish a netlogon connection, with no authentication
*/
status = dcerpc_secondary_smb(p, &p2,
DCERPC_NETLOGON_NAME,
DCERPC_NETLOGON_UUID,
DCERPC_NETLOGON_VERSION);
/*
step 2 - request a netlogon challenge
*/
r.in.server_name = talloc_asprintf(p->mem_ctx, "\\\\%s", dcerpc_server_name(p));
r.in.computer_name = workstation;
generate_random_buffer(r.in.credentials.data, sizeof(r.in.credentials.data), False);
status = dcerpc_netr_ServerReqChallenge(p2, p->mem_ctx, &r);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
/*
step 3 - authenticate on the netlogon pipe
*/
E_md4hash(password, mach_pwd);
creds_client_init(&creds, &r.in.credentials, &r.out.credentials, mach_pwd,
&a.in.credentials);
a.in.server_name = r.in.server_name;
a.in.username = talloc_asprintf(p->mem_ctx, "%s$", workstation);
if (lp_server_role() == ROLE_DOMAIN_BDC) {
a.in.secure_channel_type = SEC_CHAN_BDC;
} else {
a.in.secure_channel_type = SEC_CHAN_WKSTA;
}
a.in.computer_name = workstation;
a.in.negotiate_flags = &negotiate_flags;
a.out.negotiate_flags = &negotiate_flags;
status = dcerpc_netr_ServerAuthenticate2(p2, p->mem_ctx, &a);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (!creds_client_check(&creds, &a.out.credentials)) {
return NT_STATUS_UNSUCCESSFUL;
}
/*
the schannel session key is now in creds.session_key
*/
/*
step 4 - perform a bind with security type schannel
*/
p->auth_info = talloc(p->mem_ctx, sizeof(*p->auth_info));
if (!p->auth_info) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
p->auth_info->auth_type = DCERPC_AUTH_TYPE_SCHANNEL;
if (p->flags & DCERPC_SEAL) {
p->auth_info->auth_level = DCERPC_AUTH_LEVEL_PRIVACY;
} else {
/* note that DCERPC_AUTH_LEVEL_NONE does not make any
sense, and would be rejected by the server */
p->auth_info->auth_level = DCERPC_AUTH_LEVEL_INTEGRITY;
}
p->auth_info->auth_pad_length = 0;
p->auth_info->auth_reserved = 0;
p->auth_info->auth_context_id = 1;
p->security_state = NULL;
p->auth_info->credentials = data_blob_talloc(p->mem_ctx,
NULL,
8 +
strlen(workgroup)+1 +
strlen(workstation)+1);
if (!p->auth_info->credentials.data) {
return NT_STATUS_NO_MEMORY;
}
/* oh, this is ugly! */
SIVAL(p->auth_info->credentials.data, 0, 0);
SIVAL(p->auth_info->credentials.data, 4, 3);
memcpy(p->auth_info->credentials.data+8, workgroup, strlen(workgroup)+1);
memcpy(p->auth_info->credentials.data+8+strlen(workgroup)+1,
workstation, strlen(workstation)+1);
/* send the authenticated bind request */
status = dcerpc_bind_byuuid(p, p->mem_ctx, uuid, version);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
p->security_state = talloc_p(p->mem_ctx, struct dcerpc_security);
if (!p->security_state) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
schannel_state = talloc_p(p->mem_ctx, struct schannel_state);
if (!schannel_state) {
status = NT_STATUS_NO_MEMORY;
goto done;
}
memcpy(session_key, creds.session_key, 8);
memset(session_key+8, 0, 8);
status = schannel_start(&schannel_state, session_key, True);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
dump_data_pw("session key:\n", schannel_state->session_key, 16);
p->security_state->private = schannel_state;
p->security_state->unseal_packet = schan_unseal_packet;
p->security_state->check_packet = schan_check_packet;
p->security_state->seal_packet = schan_seal_packet;
p->security_state->sign_packet = schan_sign_packet;
p->security_state->security_end = schan_security_end;
done:
return status;
}
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