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133 lines
3.9 KiB
C
133 lines
3.9 KiB
C
/* Copyright (C) 2019 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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*
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* \author Giuseppe Longo <giuseppe@glongo.it>
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*
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* Implements the sip.uri sticky buffer
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*
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*/
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#include "suricata-common.h"
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#include "threads.h"
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#include "decode.h"
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#include "detect.h"
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#include "detect-parse.h"
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#include "detect-engine.h"
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#include "detect-engine-mpm.h"
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#include "detect-engine-prefilter.h"
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#include "detect-content.h"
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#include "detect-pcre.h"
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#include "detect-urilen.h"
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#include "flow.h"
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#include "flow-var.h"
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#include "flow-util.h"
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#include "util-debug.h"
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#include "util-unittest.h"
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#include "util-unittest-helper.h"
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#include "util-spm.h"
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#include "app-layer.h"
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#include "app-layer-parser.h"
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#include "detect-sip-uri.h"
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#include "stream-tcp.h"
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#include "rust.h"
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#include "app-layer-sip.h"
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#define KEYWORD_NAME "sip.uri"
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#define KEYWORD_DOC "sip-keywords.html#sip-uri"
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#define BUFFER_NAME "sip.uri"
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#define BUFFER_DESC "sip request uri"
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static int g_buffer_id = 0;
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static bool DetectSipUriValidateCallback(const Signature *s, const char **sigerror)
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{
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return DetectUrilenValidateContent(s, g_buffer_id, sigerror);
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}
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static void DetectSipUriSetupCallback(const DetectEngineCtx *de_ctx,
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Signature *s)
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{
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SCLogDebug("callback invoked by %u", s->id);
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DetectUrilenApplyToContent(s, g_buffer_id);
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}
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static int DetectSipUriSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
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{
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if (DetectBufferSetActiveList(de_ctx, s, g_buffer_id) < 0)
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return -1;
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if (DetectSignatureSetAppProto(s, ALPROTO_SIP) < 0)
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return -1;
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return 0;
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}
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static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms, Flow *_f,
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const uint8_t _flow_flags, void *txv, 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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const uint8_t *b = NULL;
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uint32_t b_len = 0;
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if (rs_sip_tx_get_uri(txv, &b, &b_len) != 1)
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return NULL;
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if (b == NULL || b_len == 0)
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return NULL;
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InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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}
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return buffer;
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}
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void DetectSipUriRegister(void)
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{
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sigmatch_table[DETECT_AL_SIP_URI].name = KEYWORD_NAME;
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sigmatch_table[DETECT_AL_SIP_URI].desc = "sticky buffer to match on the SIP URI";
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sigmatch_table[DETECT_AL_SIP_URI].url = "/rules/" KEYWORD_DOC;
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sigmatch_table[DETECT_AL_SIP_URI].Setup = DetectSipUriSetup;
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sigmatch_table[DETECT_AL_SIP_URI].flags |= SIGMATCH_NOOPT;
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DetectAppLayerInspectEngineRegister(BUFFER_NAME, ALPROTO_SIP, SIG_FLAG_TOSERVER, 0,
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DetectEngineInspectBufferGeneric, GetData);
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DetectAppLayerMpmRegister(BUFFER_NAME, SIG_FLAG_TOSERVER, 2, PrefilterGenericMpmRegister,
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GetData, ALPROTO_SIP, 1);
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DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC);
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DetectBufferTypeRegisterSetupCallback(BUFFER_NAME,
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DetectSipUriSetupCallback);
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DetectBufferTypeRegisterValidateCallback(BUFFER_NAME,
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DetectSipUriValidateCallback);
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g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME);
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SCLogDebug("registering " BUFFER_NAME " rule option");
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}
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