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344 lines
10 KiB
C
344 lines
10 KiB
C
/* Copyright (C) 2014 Open Information Security Foundation
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*
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* You can copy, redistribute or modify this Program under the terms of
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* the GNU General Public License version 2 as published by the Free
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* Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* version 2 along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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* 02110-1301, USA.
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*/
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/**
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* \file
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*
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* \author casec Bachelors group
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* \author Lauritz Prag Sømme <lauritz24@me.com>
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* \author Levi Tobiassen <levi.tobiassen@gmail.com>
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* \author Stian Hoel Bergseth <stian.bergseth@hig.no>
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* \author Vinjar Hillestad <vinjar.hillestad@hig.no>
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*/
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#include "suricata-common.h"
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#include "debug.h"
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#include "conf.h"
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#include "threads.h"
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#include "threadvars.h"
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#include "tm-threads.h"
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#include "output.h"
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#include "app-layer-smtp.h"
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#ifdef HAVE_LUA
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#include <lua.h>
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#include <lualib.h>
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#include "util-lua.h"
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#include "util-lua-common.h"
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#include "util-lua-smtp.h"
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#include "util-file.h"
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/*
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* \brief internal function used by SMTPGetMimeField
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*
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* \param luastate luastate stack to use and push attributes to
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* \param flow network flow of SMTP packets
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* \param name name of the attribute to extract from MimeDecField
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*
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* \retval 1 if success mimefield found and pushed to stack. Returns error
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* int and msg pushed to luastate stack if error occurs.
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*/
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static int GetMimeDecField(lua_State *luastate, Flow *flow, const char *name)
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{
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/* extract state from flow */
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SMTPState *state = (SMTPState *) FlowGetAppState(flow);
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/* check that state exsists */
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if(state == NULL) {
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return LuaCallbackError(luastate, "Internal error: no state in flow");
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}
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/* pointer to current transaction in state */
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SMTPTransaction *smtp_tx = state->curr_tx;
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if(smtp_tx == NULL) {
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return LuaCallbackError(luastate, "Transaction ending or not found");
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}
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/* pointer to tail of msg list of MimeDecEntitys in current transaction. */
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MimeDecEntity *mime = smtp_tx->msg_tail;
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/* check if msg_tail was hit */
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if(mime == NULL){
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return LuaCallbackError(luastate, "Internal error: no fields in transaction");
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}
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/* extract MIME field based on spesific field name. */
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MimeDecField *field = MimeDecFindField(mime, name);
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/* check MIME field */
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if(field == NULL) {
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return LuaCallbackError(luastate, "Error: mimefield not found");
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}
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/* return extracted field. */
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if(field->value == NULL || field->value_len == 0){
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return LuaCallbackError(luastate, "Error, pointer error");
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}
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return LuaPushStringBuffer(luastate, field->value, field->value_len);
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}
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/**
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* \brief Function extracts specific MIME field based on argument from luastate
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* stack then pushing the attribute onto the luastate stack.
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*
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* \param luastate luastate stack to pop and push attributes for I/O to lua
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*
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* \retval 1 if success mimefield found and pushed to stack. Returns error
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* int and msg pushed to luastate stack if error occurs.
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*/
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static int SMTPGetMimeField(lua_State *luastate)
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{
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if(!(LuaStateNeedProto(luastate, ALPROTO_SMTP))) {
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return LuaCallbackError(luastate, "error: protocol not SMTP");
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}
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Flow *flow = LuaStateGetFlow(luastate);
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/* check that flow exist */
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if(flow == NULL) {
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return LuaCallbackError(luastate, "Error: no flow found");
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}
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const char *name = LuaGetStringArgument(luastate, 1);
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if (name == NULL)
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return LuaCallbackError(luastate, "1st argument missing, empty or wrong type");
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GetMimeDecField(luastate, flow, name);
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return 1;
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}
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/**
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* \brief Internal function used by SMTPGetMimeList
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*
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* \param luastate luastate stack to pop and push attributes for I/O to lua
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* \param flow network flow of SMTP packets
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*
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* \retval 1 if the mimelist table is pushed to luastate stack.
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* Returns error int and msg pushed to luastate stack if error occurs.
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*/
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static int GetMimeList(lua_State *luastate, Flow *flow)
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{
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SMTPState *state = (SMTPState *) FlowGetAppState(flow);
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if(state == NULL) {
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return LuaCallbackError(luastate, "Error: no SMTP state");
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}
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/* Create a pointer to the current SMTPtransaction */
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SMTPTransaction *smtp_tx = state->curr_tx;
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if(smtp_tx == NULL) {
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return LuaCallbackError(luastate, "Error: no SMTP transaction found");
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}
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/* Create a pointer to the tail of MimeDecEntity list */
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MimeDecEntity *mime = smtp_tx->msg_tail;
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if(mime == NULL) {
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return LuaCallbackError(luastate, "Error: no mime entity found");
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}
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MimeDecField *field = mime->field_list;
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if(field == NULL) {
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return LuaCallbackError(luastate, "Error: no field_list found");
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}
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if(field->name == NULL || field->name_len == 0) {
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return LuaCallbackError(luastate, "Error: field has no name");
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}
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/* Counter of MIME fields found */
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int num = 1;
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/* loop trough the list of mimeFields, printing each name found */
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lua_newtable(luastate);
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while (field != NULL) {
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if(field->name != NULL && field->name_len != 0) {
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lua_pushinteger(luastate,num++);
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LuaPushStringBuffer(luastate, field->name, field->name_len);
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lua_settable(luastate,-3);
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}
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field = field->next;
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}
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return 1;
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}
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/**
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* \brief Lists name and value to all MIME fields which
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* is included in a SMTP transaction.
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*
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* \param luastate luastate stack to pop and push attributes for I/O to lua.
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*
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* \retval 1 if the table is pushed to lua.
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* Returns error int and msg pushed to luastate stack if error occurs
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*
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*/
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static int SMTPGetMimeList(lua_State *luastate)
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{
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/* Check if right protocol */
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if(!(LuaStateNeedProto(luastate, ALPROTO_SMTP))) {
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return LuaCallbackError(luastate, "Error: protocol not SMTP");
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}
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/* Extract network flow */
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Flow *flow = LuaStateGetFlow(luastate);
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if(flow == NULL) {
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return LuaCallbackError(luastate, "Error: no flow found");
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}
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GetMimeList(luastate, flow);
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return 1;
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}
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/**
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* \brief internal function used by SMTPGetMailFrom
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*
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* \param luastate luastate stack to pop and push attributes for I/O to lua.
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* \param flow flow to get state for SMTP
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*
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* \retval 1 if mailfrom field found.
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* Retruns error int and msg pushed to luastate stack if error occurs
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*/
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static int GetMailFrom(lua_State *luastate, Flow *flow)
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{
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/* Extract SMTPstate from current flow */
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SMTPState *state = (SMTPState *) FlowGetAppState(flow);
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if(state == NULL) {
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return LuaCallbackError(luastate, "Internal Error: no state");
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}
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SMTPTransaction *smtp_tx = state->curr_tx;
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if(smtp_tx == NULL) {
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return LuaCallbackError(luastate, "Internal Error: no SMTP transaction");
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}
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if(smtp_tx->mail_from == NULL || smtp_tx->mail_from_len == 0) {
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return LuaCallbackError(luastate, "MailFrom not found");
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}
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return LuaPushStringBuffer(luastate, smtp_tx->mail_from, smtp_tx->mail_from_len);
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/* Returns 1 because we never push more then 1 item to the lua stack */
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}
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/**
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* \brief Extracts mail_from parameter from SMTPState.
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* Attribute may also be available from mimefields, although there is no
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* guarantee of it existing as mime.
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*
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* \param luastate luastate stack to pop and push attributes for I/O to lua.
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*
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* \retval 1 if mailfrom field found.
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* Retruns error int and msg pushed to luastate stack if error occurs
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*/
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static int SMTPGetMailFrom(lua_State *luastate)
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{
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/* check protocol */
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if(!(LuaStateNeedProto(luastate, ALPROTO_SMTP))) {
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return LuaCallbackError(luastate, "Error: protocol not SMTP");
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}
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/* Extract flow, with lockhint to check mutexlocking */
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Flow *flow = LuaStateGetFlow(luastate);
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if(flow == NULL) {
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return LuaCallbackError(luastate, "Internal Error: no flow");
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}
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GetMailFrom(luastate, flow);
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return 1;
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}
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/**
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* \brief intern function used by SMTPGetRcpList
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*
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* \params luastate luastate stack for internal communication with Lua.
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* Used to hand over data to the recieveing luascript.
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*
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* \retval 1 if the table is pushed to lua.
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* Returns error int and msg pushed to luastate stack if error occurs
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*/
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static int GetRcptList(lua_State *luastate, Flow *flow)
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{
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SMTPState *state = (SMTPState *) FlowGetAppState(flow);
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if(state == NULL) {
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return LuaCallbackError(luastate, "Internal error, no state");
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}
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SMTPTransaction *smtp_tx = state->curr_tx;
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if(smtp_tx == NULL) {
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return LuaCallbackError(luastate, "No more tx, or tx not found");
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}
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/* Create a new table in luastate for rcpt list */
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lua_newtable(luastate);
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/* rcpt var for iterator */
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int u = 1;
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SMTPString *rcpt;
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TAILQ_FOREACH(rcpt, &smtp_tx->rcpt_to_list, next) {
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lua_pushinteger(luastate, u++);
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LuaPushStringBuffer(luastate, rcpt->str, rcpt->len);
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lua_settable(luastate, -3);
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}
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/* return 1 since we allways push one table to luastate */
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return 1;
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}
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/**
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* \brief function loops through rcpt-list located in
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* flow->SMTPState->SMTPTransaction, adding all items to a table.
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* Then pushing it to the luastate stack.
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*
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* \params luastate luastate stack for internal communication with Lua.
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* Used to hand over data to the recieveing luascript.
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*
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* \retval 1 if the table is pushed to lua.
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* Returns error int and msg pushed to luastate stack if error occurs
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*/
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static int SMTPGetRcptList(lua_State *luastate)
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{
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/* check protocol */
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if(!(LuaStateNeedProto(luastate, ALPROTO_SMTP))) {
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return LuaCallbackError(luastate, "Error: protocol not SMTP");
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}
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/* Extract flow, with lockhint to check mutexlocking */
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Flow *flow = LuaStateGetFlow(luastate);
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if(flow == NULL) {
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return LuaCallbackError(luastate, "Internal error: no flow");
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}
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GetRcptList(luastate, flow);
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/* return 1 since we allways push one table to luastate */
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return 1;
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}
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int LuaRegisterSmtpFunctions(lua_State *luastate)
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{
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lua_pushcfunction(luastate, SMTPGetMimeField);
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lua_setglobal(luastate, "SMTPGetMimeField");
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lua_pushcfunction(luastate, SMTPGetMimeList);
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lua_setglobal(luastate, "SMTPGetMimeList");
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lua_pushcfunction(luastate, SMTPGetMailFrom);
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lua_setglobal(luastate, "SMTPGetMailFrom");
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lua_pushcfunction(luastate, SMTPGetRcptList);
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lua_setglobal(luastate, "SMTPGetRcptList");
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return 0;
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}
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#endif /* HAVE_LUA */
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