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97 lines
3.3 KiB
C
97 lines
3.3 KiB
C
/* Copyright (C) 2024 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 Mahmoud Maatuq <mahmoudmatook.mm@gmail.com>
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*
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*/
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#include "app-layer.h"
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#include "app-layer-detect-proto.h"
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#include "app-layer-imap.h"
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static int IMAPRegisterPatternsForProtocolDetection(void)
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{
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* OK ", 5, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* NO ", 5, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* BAD ", 6, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* LIST ", 7, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* ESEARCH ", 10, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* STATUS ", 9, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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if (SCAppLayerProtoDetectPMRegisterPatternCI(
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IPPROTO_TCP, ALPROTO_IMAP, "* FLAGS ", 8, 0, STREAM_TOCLIENT) < 0) {
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return -1;
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}
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/**
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* there is no official document that limits the length of the tag
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* some practical implementations limit it to 20 characters
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* but keeping depth equal to 31 fails unit tests such AppLayerTest10
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* so keeping depth 17 for now to pass unit tests, that might miss some detections
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* until we find a better solution for the unit tests.
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*
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* AppLayerTest10 fails because it expects protocol detection to be completed with only 17 bytes
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* as input, and with this new pattern, we would need more bytes to finish protocol detection.
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*/
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if (SCAppLayerProtoDetectPMRegisterPatternCI(IPPROTO_TCP, ALPROTO_IMAP, " CAPABILITY",
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17 /*6 for max tag len + space + len(CAPABILITY)*/, 0, STREAM_TOSERVER) < 0) {
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return -1;
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}
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return 0;
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}
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void RegisterIMAPParsers(void)
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{
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const char *proto_name = "imap";
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if (SCAppLayerProtoDetectConfProtoDetectionEnabled("tcp", proto_name)) {
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SCLogDebug("IMAP protocol detection is enabled.");
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AppLayerProtoDetectRegisterProtocol(ALPROTO_IMAP, proto_name);
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if (IMAPRegisterPatternsForProtocolDetection() < 0)
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SCLogError("Failed to register IMAP protocol detection patterns.");
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} else {
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SCLogDebug("Protocol detector and parser disabled for IMAP.");
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}
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}
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