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samba-mirror/source3/smbd/smb2_sesssetup.c
2009-08-12 13:27:58 +02:00

407 lines
12 KiB
C

/*
Unix SMB/CIFS implementation.
Core SMB2 server
Copyright (C) Stefan Metzmacher 2009
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 "smbd/globals.h"
#include "../source4/libcli/smb2/smb2_constants.h"
static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
uint64_t in_session_id,
uint8_t in_security_mode,
DATA_BLOB in_security_buffer,
uint16_t *out_session_flags,
DATA_BLOB *out_security_buffer,
uint64_t *out_session_id);
NTSTATUS smbd_smb2_request_process_sesssetup(struct smbd_smb2_request *req)
{
const uint8_t *inhdr;
const uint8_t *inbody;
int i = req->current_idx;
uint8_t *outhdr;
DATA_BLOB outbody;
DATA_BLOB outdyn;
size_t expected_body_size = 0x19;
size_t body_size;
uint64_t in_session_id;
uint8_t in_security_mode;
uint16_t in_security_offset;
uint16_t in_security_length;
DATA_BLOB in_security_buffer;
uint16_t out_session_flags;
uint64_t out_session_id;
uint16_t out_security_offset;
DATA_BLOB out_security_buffer;
NTSTATUS status;
inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
body_size = SVAL(inbody, 0x00);
if (body_size != expected_body_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
in_security_offset = SVAL(inbody, 0x0C);
in_security_length = SVAL(inbody, 0x0E);
if (in_security_offset != (SMB2_HDR_BODY + (body_size & 0xFFFFFFFE))) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
if (in_security_length > req->in.vector[i+2].iov_len) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
in_security_mode = CVAL(inbody, 0x03);
in_security_buffer.data = (uint8_t *)req->in.vector[i+2].iov_base;
in_security_buffer.length = in_security_length;
status = smbd_smb2_session_setup(req,
in_session_id,
in_security_mode,
in_security_buffer,
&out_session_flags,
&out_security_buffer,
&out_session_id);
if (!NT_STATUS_IS_OK(status) &&
!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
status = nt_status_squash(status);
return smbd_smb2_request_error(req, status);
}
out_security_offset = SMB2_HDR_BODY + 0x08;
outhdr = (uint8_t *)req->out.vector[i].iov_base;
outbody = data_blob_talloc(req->out.vector, NULL, 0x08);
if (outbody.data == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
SBVAL(outhdr, SMB2_HDR_SESSION_ID, out_session_id);
SSVAL(outbody.data, 0x00, 0x08 + 1); /* struct size */
SSVAL(outbody.data, 0x02,
out_session_flags); /* session flags */
SSVAL(outbody.data, 0x04,
out_security_offset); /* security buffer offset */
SSVAL(outbody.data, 0x06,
out_security_buffer.length); /* security buffer length */
outdyn = out_security_buffer;
return smbd_smb2_request_done_ex(req, status, outbody, &outdyn,
__location__);
}
static int smbd_smb2_session_destructor(struct smbd_smb2_session *session)
{
if (session->sconn == NULL) {
return 0;
}
/* first free all tcons */
while (session->tcons.list) {
talloc_free(session->tcons.list);
}
idr_remove(session->sconn->smb2.sessions.idtree, session->vuid);
DLIST_REMOVE(session->sconn->smb2.sessions.list, session);
invalidate_vuid(session->sconn, session->vuid);
session->vuid = 0;
session->status = NT_STATUS_USER_SESSION_DELETED;
session->sconn = NULL;
return 0;
}
static NTSTATUS smbd_smb2_session_setup(struct smbd_smb2_request *req,
uint64_t in_session_id,
uint8_t in_security_mode,
DATA_BLOB in_security_buffer,
uint16_t *out_session_flags,
DATA_BLOB *out_security_buffer,
uint64_t *out_session_id)
{
struct smbd_smb2_session *session;
NTSTATUS status;
*out_session_flags = 0;
*out_session_id = 0;
if (in_session_id == 0) {
int id;
/* create a new session */
session = talloc_zero(req->sconn, struct smbd_smb2_session);
if (session == NULL) {
return NT_STATUS_NO_MEMORY;
}
session->status = NT_STATUS_MORE_PROCESSING_REQUIRED;
id = idr_get_new_random(req->sconn->smb2.sessions.idtree,
session,
req->sconn->smb2.sessions.limit);
if (id == -1) {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
session->vuid = id;
session->tcons.idtree = idr_init(session);
if (session->tcons.idtree == NULL) {
return NT_STATUS_NO_MEMORY;
}
session->tcons.limit = 0x0000FFFE;
session->tcons.list = NULL;
DLIST_ADD_END(req->sconn->smb2.sessions.list, session,
struct smbd_smb2_session *);
session->sconn = req->sconn;
talloc_set_destructor(session, smbd_smb2_session_destructor);
} else {
void *p;
/* lookup an existing session */
p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
if (p == NULL) {
return NT_STATUS_USER_SESSION_DELETED;
}
session = talloc_get_type_abort(p, struct smbd_smb2_session);
}
if (NT_STATUS_IS_OK(session->status)) {
return NT_STATUS_REQUEST_NOT_ACCEPTED;
}
if (session->auth_ntlmssp_state == NULL) {
status = auth_ntlmssp_start(&session->auth_ntlmssp_state);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(session);
return status;
}
}
if (in_security_buffer.data[0] == ASN1_APPLICATION(0)) {
DATA_BLOB secblob_in;
DATA_BLOB chal_out;
char *kerb_mech = NULL;
status = parse_spnego_mechanisms(in_security_buffer,
&secblob_in, &kerb_mech);
if (!NT_STATUS_IS_OK(status)) {
TALLOC_FREE(session);
return nt_status_squash(status);
}
/* For now, just SPNEGO NTLMSSP - krb5 goes here later.. */
status = auth_ntlmssp_update(session->auth_ntlmssp_state,
secblob_in,
&chal_out);
if (!NT_STATUS_IS_OK(status) &&
!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
auth_ntlmssp_end(&session->auth_ntlmssp_state);
TALLOC_FREE(session);
return nt_status_squash(status);
}
*out_security_buffer = spnego_gen_auth_response(&chal_out,
status, OID_NTLMSSP);
*out_session_id = session->vuid;
return status;
} else if (in_security_buffer.data[0] == ASN1_CONTEXT(1)) {
DATA_BLOB auth = data_blob_null;
DATA_BLOB auth_out = data_blob_null;
/* its an auth packet */
if (!spnego_parse_auth(in_security_buffer, &auth)) {
TALLOC_FREE(session);
return NT_STATUS_LOGON_FAILURE;
}
/* For now, just SPNEGO NTLMSSP - krb5 goes here later.. */
status = auth_ntlmssp_update(session->auth_ntlmssp_state,
auth,
&auth_out);
if (!NT_STATUS_IS_OK(status)) {
auth_ntlmssp_end(&session->auth_ntlmssp_state);
TALLOC_FREE(session);
return nt_status_squash(status);
}
*out_security_buffer = spnego_gen_auth_response(&auth_out,
status, NULL);
*out_session_id = session->vuid;
} else if (strncmp((char *)(in_security_buffer.data), "NTLMSSP", 7) == 0) {
/* RAW NTLMSSP */
status = auth_ntlmssp_update(session->auth_ntlmssp_state,
in_security_buffer,
out_security_buffer);
if (NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
*out_session_id = session->vuid;
return status;
}
if (!NT_STATUS_IS_OK(status)) {
auth_ntlmssp_end(&session->auth_ntlmssp_state);
TALLOC_FREE(session);
return nt_status_squash(status);
}
*out_session_id = session->vuid;
}
/* TODO: setup session key for signing */
if ((in_security_mode & SMB2_NEGOTIATE_SIGNING_REQUIRED) ||
lp_server_signing() == Required) {
session->do_signing = true;
}
if (session->auth_ntlmssp_state->server_info->guest) {
/* we map anonymous to guest internally */
*out_session_flags |= SMB2_SESSION_FLAG_IS_GUEST;
*out_session_flags |= SMB2_SESSION_FLAG_IS_NULL;
/* force no signing */
session->do_signing = false;
}
session->server_info = session->auth_ntlmssp_state->server_info;
data_blob_free(&session->server_info->user_session_key);
session->server_info->user_session_key =
data_blob_talloc(
session->server_info,
session->auth_ntlmssp_state->ntlmssp_state->session_key.data,
session->auth_ntlmssp_state->ntlmssp_state->session_key.length);
if (session->auth_ntlmssp_state->ntlmssp_state->session_key.length > 0) {
if (session->server_info->user_session_key.data == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
}
session->session_key = session->server_info->user_session_key;
session->compat_vuser = talloc_zero(session, user_struct);
if (session->compat_vuser == NULL) {
TALLOC_FREE(session);
return NT_STATUS_NO_MEMORY;
}
session->compat_vuser->auth_ntlmssp_state = session->auth_ntlmssp_state;
session->compat_vuser->homes_snum = -1;
session->compat_vuser->server_info = session->server_info;
session->compat_vuser->session_keystr = NULL;
session->compat_vuser->vuid = session->vuid;
DLIST_ADD(session->sconn->smb1.sessions.validated_users, session->compat_vuser);
session->status = NT_STATUS_OK;
/*
* we attach the session to the request
* so that the response can be signed
*/
req->session = session;
if (session->do_signing) {
req->do_signing = true;
}
*out_session_id = session->vuid;
return status;
}
NTSTATUS smbd_smb2_request_check_session(struct smbd_smb2_request *req)
{
const uint8_t *inhdr;
int i = req->current_idx;
uint64_t in_session_id;
void *p;
struct smbd_smb2_session *session;
inhdr = (const uint8_t *)req->in.vector[i+0].iov_base;
in_session_id = BVAL(inhdr, SMB2_HDR_SESSION_ID);
/* lookup an existing session */
p = idr_find(req->sconn->smb2.sessions.idtree, in_session_id);
if (p == NULL) {
return NT_STATUS_USER_SESSION_DELETED;
}
session = talloc_get_type_abort(p, struct smbd_smb2_session);
if (!NT_STATUS_IS_OK(session->status)) {
return NT_STATUS_ACCESS_DENIED;
}
set_current_user_info(session->server_info->sanitized_username,
session->server_info->unix_name,
pdb_get_domain(session->server_info->sam_account));
req->session = session;
return NT_STATUS_OK;
}
NTSTATUS smbd_smb2_request_process_logoff(struct smbd_smb2_request *req)
{
const uint8_t *inbody;
int i = req->current_idx;
DATA_BLOB outbody;
size_t expected_body_size = 0x04;
size_t body_size;
if (req->in.vector[i+1].iov_len != (expected_body_size & 0xFFFFFFFE)) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
inbody = (const uint8_t *)req->in.vector[i+1].iov_base;
body_size = SVAL(inbody, 0x00);
if (body_size != expected_body_size) {
return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER);
}
/*
* TODO: cancel all outstanding requests on the session
* and delete all tree connections.
*/
smbd_smb2_session_destructor(req->session);
/*
* we may need to sign the response, so we need to keep
* the session until the response is sent to the wire.
*/
talloc_steal(req, req->session);
outbody = data_blob_talloc(req->out.vector, NULL, 0x04);
if (outbody.data == NULL) {
return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY);
}
SSVAL(outbody.data, 0x00, 0x04); /* struct size */
SSVAL(outbody.data, 0x02, 0); /* reserved */
return smbd_smb2_request_done(req, outbody, NULL);
}