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77 lines
2.5 KiB
C
77 lines
2.5 KiB
C
6 months ago
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/* Copyright (C) 2025 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 Philippe Antoine <pantoine@oisf.net>
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*
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*/
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#include "suricata-common.h"
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#include "detect-smtp.h"
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#include "detect-engine.h"
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#include "detect-engine-helper.h"
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#include "detect-parse.h"
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#include "app-layer-smtp.h"
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#include "rust.h"
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static int g_smtp_helo_buffer_id = 0;
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static int DetectSmtpHeloSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
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{
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if (DetectBufferSetActiveList(de_ctx, s, g_smtp_helo_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_SMTP) < 0)
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return -1;
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return 0;
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}
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static InspectionBuffer *GetSmtpHeloData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *f, const uint8_t _flow_flags, void *txv,
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const int list_id)
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{
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InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
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if (buffer->inspect == NULL) {
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SMTPState *smtp_state = (SMTPState *)FlowGetAppState(f);
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if (smtp_state) {
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if (smtp_state->helo == NULL || smtp_state->helo_len == 0)
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return NULL;
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InspectionBufferSetup(det_ctx, list_id, buffer, smtp_state->helo, smtp_state->helo_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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}
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}
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return buffer;
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}
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void SCDetectSMTPRegister(void)
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{
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SCSigTableElmt kw = { 0 };
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kw.name = "smtp.helo";
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kw.desc = "SMTP helo buffer";
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kw.url = "/rules/smtp-keywords.html#smtp-helo";
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kw.Setup = (int (*)(void *, void *, const char *))DetectSmtpHeloSetup;
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kw.flags = SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
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DetectHelperKeywordRegister(&kw);
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g_smtp_helo_buffer_id =
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DetectHelperBufferMpmRegister("smtp.helo", "SMTP helo", ALPROTO_SMTP, false,
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true, // to server
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GetSmtpHeloData);
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}
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