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/*
Unix SMB/CIFS implementation.
handle SMBsessionsetup
Copyright (C) Andrew Tridgell 1998-2001
Copyright (C) Andrew Bartlett 2001
Copyright (C) Jim McDonough 2002
Copyright (C) Luke Howard 2003
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"
#include "auth/auth.h"
/*
setup the OS, Lanman and domain portions of a session setup reply
*/
static void sesssetup_common_strings(struct smbsrv_request *req,
char **os, char **lanman, char **domain)
{
(*os) = talloc_asprintf(req, "Unix");
(*lanman) = talloc_asprintf(req, "Samba %s", SAMBA_VERSION_STRING);
(*domain) = talloc_asprintf(req, "%s", lp_workgroup());
}
/*
handler for old style session setup
*/
static NTSTATUS sesssetup_old(struct smbsrv_request *req, union smb_sesssetup *sess)
{
NTSTATUS status;
struct auth_usersupplied_info *user_info = NULL;
struct auth_serversupplied_info *server_info = NULL;
struct auth_session_info *session_info;
TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
char *remote_machine;
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (!req->smb_conn->negotiate.done_sesssetup) {
req->smb_conn->negotiate.max_send = sess->old.in.bufsize;
}
remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
status = make_user_info_for_reply_enc(req->smb_conn,
&user_info,
sess->old.in.user, sess->old.in.domain,
remote_machine,
sess->old.in.password,
data_blob(NULL, 0));
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return NT_STATUS_ACCESS_DENIED;
}
status = req->smb_conn->negotiate.auth_context->check_ntlm_password(req->smb_conn->negotiate.auth_context,
user_info,
mem_ctx,
&server_info);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return nt_status_squash(status);
}
/* This references server_info into session_info */
status = make_session_info(req, server_info, &session_info);
talloc_free(mem_ctx);
if (!NT_STATUS_IS_OK(status)) {
return nt_status_squash(status);
}
sess->old.out.action = 0;
sess->old.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
if (sess->old.out.vuid == UID_FIELD_INVALID) {
return NT_STATUS_ACCESS_DENIED;
}
sesssetup_common_strings(req,
&sess->old.out.os,
&sess->old.out.lanman,
&sess->old.out.domain);
req->session = smbsrv_session_find(req->smb_conn, sess->old.out.vuid);
return NT_STATUS_OK;
}
/*
handler for NT1 style session setup
*/
static NTSTATUS sesssetup_nt1(struct smbsrv_request *req, union smb_sesssetup *sess)
{
NTSTATUS status;
struct auth_usersupplied_info *user_info = NULL;
struct auth_serversupplied_info *server_info = NULL;
struct auth_session_info *session_info;
TALLOC_CTX *mem_ctx = talloc_named(req, 0, "NT1 session setup");
if (!mem_ctx) {
return NT_STATUS_NO_MEMORY;
}
if (!req->smb_conn->negotiate.done_sesssetup) {
req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
}
if (req->smb_conn->negotiate.spnego_negotiated) {
struct auth_context *auth_context;
if (sess->nt1.in.user && *sess->nt1.in.user) {
return NT_STATUS_ACCESS_DENIED;
} else {
make_user_info_guest(req->smb_conn, &user_info);
}
status = make_auth_context_subsystem(req->smb_conn, &auth_context);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return status;
}
status = auth_context->check_ntlm_password(auth_context,
user_info,
mem_ctx,
&server_info);
} else {
char *remote_machine;
remote_machine = socket_get_peer_addr(req->smb_conn->connection->socket, mem_ctx);
status = make_user_info_for_reply_enc(req->smb_conn,
&user_info,
sess->nt1.in.user, sess->nt1.in.domain,
remote_machine,
sess->nt1.in.password1,
sess->nt1.in.password2);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return NT_STATUS_ACCESS_DENIED;
}
status = req->smb_conn->negotiate
.auth_context->check_ntlm_password(req->smb_conn->negotiate
.auth_context,
user_info,
req,
&server_info);
}
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return nt_status_squash(status);
}
/* This references server_info into session_info */
status = make_session_info(mem_ctx, server_info, &session_info);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return nt_status_squash(status);
}
sess->nt1.out.action = 0;
sess->nt1.out.vuid = smbsrv_register_session(req->smb_conn, session_info, NULL);
talloc_free(mem_ctx);
if (sess->nt1.out.vuid == UID_FIELD_INVALID) {
return NT_STATUS_ACCESS_DENIED;
}
sesssetup_common_strings(req,
&sess->nt1.out.os,
&sess->nt1.out.lanman,
&sess->nt1.out.domain);
req->session = smbsrv_session_find(req->smb_conn, sess->nt1.out.vuid);
if (session_info->server_info->guest) {
return NT_STATUS_OK;
}
if (!srv_setup_signing(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2)) {
/* Already signing, or disabled */
return NT_STATUS_OK;
}
/* Force check of the request packet, now we know the session key */
req_signing_check_incoming(req);
srv_signing_restart(req->smb_conn, &session_info->session_key, &sess->nt1.in.password2);
return NT_STATUS_OK;
}
/*
handler for SPNEGO style session setup
*/
static NTSTATUS sesssetup_spnego(struct smbsrv_request *req, union smb_sesssetup *sess)
{
NTSTATUS status = NT_STATUS_ACCESS_DENIED;
struct smbsrv_session *smb_sess;
struct gensec_security *gensec_ctx = NULL;
struct auth_session_info *session_info = NULL;
uint16_t vuid;
if (!req->smb_conn->negotiate.done_sesssetup) {
req->smb_conn->negotiate.max_send = sess->nt1.in.bufsize;
req->smb_conn->negotiate.client_caps = sess->nt1.in.capabilities;
}
vuid = SVAL(req->in.hdr,HDR_UID);
smb_sess = smbsrv_session_find(req->smb_conn, vuid);
if (smb_sess && !smb_sess->session_info) {
if (!smb_sess->gensec_ctx) {
return NT_STATUS_INVALID_HANDLE;
}
status = gensec_update(smb_sess->gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
} else {
smb_sess = NULL;
status = gensec_server_start(req->smb_conn, &gensec_ctx);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start GENSEC server code: %s\n", nt_errstr(status)));
return status;
}
gensec_want_feature(gensec_ctx, GENSEC_WANT_SESSION_KEY);
status = gensec_start_mech_by_oid(gensec_ctx, OID_SPNEGO);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1, ("Failed to start GENSEC SPNEGO server code: %s\n", nt_errstr(status)));
return status;
}
status = gensec_update(gensec_ctx, req, sess->spnego.in.secblob, &sess->spnego.out.secblob);
}
if (!smb_sess) {
vuid = smbsrv_register_session(req->smb_conn,
session_info, gensec_ctx);
if (vuid == UID_FIELD_INVALID) {
return NT_STATUS_ACCESS_DENIED;
}
smb_sess = smbsrv_session_find(req->smb_conn, vuid);
if (!smb_sess) {
return NT_STATUS_FOOBAR;
}
}
if (NT_STATUS_IS_OK(status)) {
DATA_BLOB session_key;
status = gensec_session_info(smb_sess->gensec_ctx, &smb_sess->session_info);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
status = gensec_session_key(smb_sess->gensec_ctx,
&session_key);
if (NT_STATUS_IS_OK(status)
&& !smb_sess->session_info->server_info->guest
&& srv_setup_signing(req->smb_conn, &session_key, NULL)) {
/* Force check of the request packet, now we know the session key */
req_signing_check_incoming(req);
srv_signing_restart(req->smb_conn, &session_key, NULL);
}
} else {
status = nt_status_squash(status);
if (smb_sess->gensec_ctx &&
!NT_STATUS_EQUAL(status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
gensec_end(&smb_sess->gensec_ctx);
}
}
sess->spnego.out.action = 0;
sess->spnego.out.vuid = vuid;
sesssetup_common_strings(req,
&sess->spnego.out.os,
&sess->spnego.out.lanman,
&sess->spnego.out.domain);
return status;
}
/*
backend for sessionsetup call - this takes all 3 variants of the call
*/
NTSTATUS sesssetup_backend(struct smbsrv_request *req,
union smb_sesssetup *sess)
{
NTSTATUS status = NT_STATUS_INVALID_LEVEL;
switch (sess->generic.level) {
case RAW_SESSSETUP_GENERIC:
status = NT_STATUS_INVALID_LEVEL;
break;
case RAW_SESSSETUP_OLD:
status = sesssetup_old(req, sess);
break;
case RAW_SESSSETUP_NT1:
status = sesssetup_nt1(req, sess);
break;
case RAW_SESSSETUP_SPNEGO:
status = sesssetup_spnego(req, sess);
break;
}
if (NT_STATUS_IS_OK(status)) {
req->smb_conn->negotiate.done_sesssetup = True;
}
return status;
}
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