mirror of https://github.com/OISF/suricata
Add krb5_cname and krb5_sname detection keywords
Pierre Chifflier
8 years ago
parent
0bd81ff838
commit
d6b9c0294a
@ -0,0 +1,245 @@
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/* Copyright (C) 2018 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 Pierre Chifflier <chifflier@wzdftpd.net>
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*/
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#include "suricata-common.h"
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#include "util-unittest.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-state.h"
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#include "detect-engine-prefilter.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-krb5-cname.h"
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#ifdef HAVE_RUST
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#include "rust.h"
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#include "app-layer-krb5.h"
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#include "rust-krb-detect-gen.h"
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static int g_krb5_cname_buffer_id = 0;
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struct Krb5PrincipalNameDataArgs {
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int local_id; /**< used as index into thread inspect array */
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void *txv;
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};
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static int DetectKrb5CNameSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
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{
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DetectBufferSetActiveList(s, g_krb5_cname_buffer_id);
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if (DetectSignatureSetAppProto(s, ALPROTO_KRB5) != 0)
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return -1;
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return 0;
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}
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/** \brief get an InspectionBuffer. Make space if we have to. */
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static InspectionBuffer *GetBuffer(InspectionBufferMultipleForList *fb, uint32_t id)
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{
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if (id >= fb->size) {
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uint32_t old_size = fb->size;
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uint32_t new_size = id + 1;
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uint32_t grow_by = new_size - old_size;
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SCLogDebug("size is %u, need %u, so growing by %u",
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old_size, new_size, grow_by);
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void *ptr = SCRealloc(fb->inspection_buffers, (id + 1) * sizeof(InspectionBuffer));
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if (ptr == NULL)
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return NULL;
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InspectionBuffer *to_zero = (InspectionBuffer *)ptr + old_size;
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SCLogDebug("fb->inspection_buffers %p ptr %p to_zero %p",
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fb->inspection_buffers, ptr, to_zero);
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memset((uint8_t *)to_zero, 0, (grow_by * sizeof(InspectionBuffer)));
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fb->inspection_buffers = ptr;
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fb->size = new_size;
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}
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InspectionBuffer *buffer = &fb->inspection_buffers[id];
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SCLogDebug("using file_data buffer %p", buffer);
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return buffer;
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}
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static InspectionBuffer *GetKrb5CNameData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms,
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Flow *_f, const struct Krb5PrincipalNameDataArgs *cbdata,
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int list_id, bool first)
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{
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SCEnter();
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InspectionBufferMultipleForList *fb = &det_ctx->multi_inspect_buffers[list_id];
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InspectionBuffer *buffer = GetBuffer(fb, cbdata->local_id);
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if (buffer == NULL)
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return NULL;
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if (!first && buffer->inspect != NULL)
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return buffer;
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uint32_t b_len = 0;
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uint8_t *b = NULL;
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if (rs_krb5_tx_get_cname(cbdata->txv, (uint16_t)cbdata->local_id, &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(buffer, b, b_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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SCReturnPtr(buffer, "InspectionBuffer");
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}
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static int DetectEngineInspectKrb5CName(
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DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
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const DetectEngineAppInspectionEngine *engine,
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const Signature *s,
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Flow *f, uint8_t flags, void *alstate, void *txv, uint64_t tx_id)
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{
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int local_id = 0;
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const DetectEngineTransforms *transforms = NULL;
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if (!engine->mpm) {
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transforms = engine->v2.transforms;
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}
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while (1) {
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struct Krb5PrincipalNameDataArgs cbdata = { local_id, txv, };
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InspectionBuffer *buffer = GetKrb5CNameData(det_ctx,
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transforms, f, &cbdata, engine->sm_list, false);
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if (buffer == NULL || buffer->inspect == NULL)
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break;
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det_ctx->buffer_offset = 0;
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det_ctx->discontinue_matching = 0;
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det_ctx->inspection_recursion_counter = 0;
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const int match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd,
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f,
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(uint8_t *)buffer->inspect,
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buffer->inspect_len,
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buffer->inspect_offset, DETECT_CI_FLAGS_SINGLE,
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DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE, NULL);
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if (match == 1) {
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return DETECT_ENGINE_INSPECT_SIG_MATCH;
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}
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local_id++;
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}
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return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
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}
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typedef struct PrefilterMpmKrb5Name {
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int list_id;
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const MpmCtx *mpm_ctx;
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const DetectEngineTransforms *transforms;
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} PrefilterMpmKrb5Name;
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/** \brief Krb5CName Krb5CName Mpm prefilter callback
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*
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* \param det_ctx detection engine thread ctx
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* \param p packet to inspect
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* \param f flow to inspect
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* \param txv tx to inspect
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* \param pectx inspection context
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*/
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static void PrefilterTxKrb5CName(DetectEngineThreadCtx *det_ctx,
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const void *pectx,
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Packet *p, Flow *f, void *txv,
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const uint64_t idx, const uint8_t flags)
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{
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SCEnter();
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const PrefilterMpmKrb5Name *ctx = (const PrefilterMpmKrb5Name *)pectx;
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const MpmCtx *mpm_ctx = ctx->mpm_ctx;
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const int list_id = ctx->list_id;
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int local_id = 0;
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while(1) {
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// loop until we get a NULL
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struct Krb5PrincipalNameDataArgs cbdata = { local_id, txv };
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InspectionBuffer *buffer = GetKrb5CNameData(det_ctx, ctx->transforms,
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f, &cbdata, list_id, true);
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if (buffer == NULL)
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break;
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if (buffer->inspect_len >= mpm_ctx->minlen) {
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(void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx,
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&det_ctx->mtcu, &det_ctx->pmq,
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buffer->inspect, buffer->inspect_len);
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}
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local_id++;
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}
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}
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static void PrefilterMpmKrb5NameFree(void *ptr)
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{
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SCFree(ptr);
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}
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static int PrefilterMpmKrb5CNameRegister(DetectEngineCtx *de_ctx,
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SigGroupHead *sgh, MpmCtx *mpm_ctx,
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const DetectMpmAppLayerRegistery *mpm_reg, int list_id)
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{
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PrefilterMpmKrb5Name *pectx = SCCalloc(1, sizeof(*pectx));
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if (pectx == NULL)
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return -1;
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pectx->list_id = list_id;
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pectx->mpm_ctx = mpm_ctx;
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pectx->transforms = &mpm_reg->v2.transforms;
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return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxKrb5CName,
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mpm_reg->v2.alproto, mpm_reg->v2.tx_min_progress,
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pectx, PrefilterMpmKrb5NameFree, mpm_reg->name);
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}
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void DetectKrb5CNameRegister(void)
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{
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sigmatch_table[DETECT_AL_KRB5_CNAME].name = "krb5_cname";
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sigmatch_table[DETECT_AL_KRB5_CNAME].Setup = DetectKrb5CNameSetup;
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sigmatch_table[DETECT_AL_KRB5_CNAME].flags |= SIGMATCH_NOOPT;
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sigmatch_table[DETECT_AL_KRB5_CNAME].desc = "sticky buffer to match on Kerberos 5 client name";
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DetectAppLayerMpmRegister2("krb5_cname", SIG_FLAG_TOCLIENT, 2,
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PrefilterMpmKrb5CNameRegister, NULL,
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ALPROTO_KRB5, 1);
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DetectAppLayerInspectEngineRegister2("krb5_cname",
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ALPROTO_KRB5, SIG_FLAG_TOCLIENT, 0,
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DetectEngineInspectKrb5CName, NULL);
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DetectBufferTypeSetDescriptionByName("krb5_cname",
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"Kerberos 5 ticket client name");
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g_krb5_cname_buffer_id = DetectBufferTypeGetByName("krb5_cname");
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}
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#else /* NO RUST */
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void DetectKrb5CNameRegister(void) {}
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#endif
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@ -0,0 +1,29 @@
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/* Copyright (C) 2015-2017 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 Pierre Chifflier <chifflier@wzdftpd.net>
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*/
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#ifndef __DETECT_KRB5_CNAME_H__
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#define __DETECT_KRB5_CNAME_H__
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void DetectKrb5CNameRegister(void);
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#endif /* __DETECT_KRB5_CNAME_H__ */
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@ -0,0 +1,245 @@
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/* Copyright (C) 2018 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 Pierre Chifflier <chifflier@wzdftpd.net>
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*/
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#include "suricata-common.h"
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#include "util-unittest.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-state.h"
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#include "detect-engine-prefilter.h"
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#include "detect-engine-content-inspection.h"
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#include "detect-krb5-sname.h"
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#ifdef HAVE_RUST
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#include "rust.h"
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#include "app-layer-krb5.h"
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#include "rust-krb-detect-gen.h"
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static int g_krb5_sname_buffer_id = 0;
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struct Krb5PrincipalNameDataArgs {
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int local_id; /**< used as index into thread inspect array */
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void *txv;
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};
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static int DetectKrb5SNameSetup(DetectEngineCtx *de_ctx, Signature *s, const char *arg)
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{
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DetectBufferSetActiveList(s, g_krb5_sname_buffer_id);
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if (DetectSignatureSetAppProto(s, ALPROTO_KRB5) != 0)
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return -1;
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return 0;
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}
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/** \brief get an InspectionBuffer. Make space if we have to. */
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static InspectionBuffer *GetBuffer(InspectionBufferMultipleForList *fb, uint32_t id)
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{
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if (id >= fb->size) {
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uint32_t old_size = fb->size;
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uint32_t new_size = id + 1;
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uint32_t grow_by = new_size - old_size;
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SCLogDebug("size is %u, need %u, so growing by %u",
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old_size, new_size, grow_by);
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void *ptr = SCRealloc(fb->inspection_buffers, (id + 1) * sizeof(InspectionBuffer));
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if (ptr == NULL)
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return NULL;
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InspectionBuffer *to_zero = (InspectionBuffer *)ptr + old_size;
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SCLogDebug("fb->inspection_buffers %p ptr %p to_zero %p",
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fb->inspection_buffers, ptr, to_zero);
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memset((uint8_t *)to_zero, 0, (grow_by * sizeof(InspectionBuffer)));
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fb->inspection_buffers = ptr;
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fb->size = new_size;
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}
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InspectionBuffer *buffer = &fb->inspection_buffers[id];
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SCLogDebug("using file_data buffer %p", buffer);
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return buffer;
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}
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static InspectionBuffer *GetKrb5SNameData(DetectEngineThreadCtx *det_ctx,
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const DetectEngineTransforms *transforms,
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Flow *_f, const struct Krb5PrincipalNameDataArgs *cbdata,
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int list_id, bool first)
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{
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SCEnter();
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InspectionBufferMultipleForList *fb = &det_ctx->multi_inspect_buffers[list_id];
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InspectionBuffer *buffer = GetBuffer(fb, cbdata->local_id);
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if (buffer == NULL)
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return NULL;
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if (!first && buffer->inspect != NULL)
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return buffer;
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uint32_t b_len = 0;
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uint8_t *b = NULL;
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if (rs_krb5_tx_get_sname(cbdata->txv, (uint16_t)cbdata->local_id, &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(buffer, b, b_len);
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InspectionBufferApplyTransforms(buffer, transforms);
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SCReturnPtr(buffer, "InspectionBuffer");
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}
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static int DetectEngineInspectKrb5SName(
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DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
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const DetectEngineAppInspectionEngine *engine,
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const Signature *s,
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Flow *f, uint8_t flags, void *alstate, void *txv, uint64_t tx_id)
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{
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int local_id = 0;
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const DetectEngineTransforms *transforms = NULL;
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if (!engine->mpm) {
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transforms = engine->v2.transforms;
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}
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while (1) {
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struct Krb5PrincipalNameDataArgs cbdata = { local_id, txv, };
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InspectionBuffer *buffer = GetKrb5SNameData(det_ctx,
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transforms, f, &cbdata, engine->sm_list, false);
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if (buffer == NULL || buffer->inspect == NULL)
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break;
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det_ctx->buffer_offset = 0;
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det_ctx->discontinue_matching = 0;
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det_ctx->inspection_recursion_counter = 0;
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const int match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd,
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f,
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(uint8_t *)buffer->inspect,
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buffer->inspect_len,
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buffer->inspect_offset, DETECT_CI_FLAGS_SINGLE,
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DETECT_ENGINE_CONTENT_INSPECTION_MODE_STATE, NULL);
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if (match == 1) {
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return DETECT_ENGINE_INSPECT_SIG_MATCH;
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}
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local_id++;
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}
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return DETECT_ENGINE_INSPECT_SIG_NO_MATCH;
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}
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typedef struct PrefilterMpmKrb5Name {
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int list_id;
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const MpmCtx *mpm_ctx;
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const DetectEngineTransforms *transforms;
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} PrefilterMpmKrb5Name;
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/** \brief Krb5SName Krb5SName Mpm prefilter callback
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*
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* \param det_ctx detection engine thread ctx
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* \param p packet to inspect
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* \param f flow to inspect
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* \param txv tx to inspect
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* \param pectx inspection context
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*/
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static void PrefilterTxKrb5SName(DetectEngineThreadCtx *det_ctx,
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const void *pectx,
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Packet *p, Flow *f, void *txv,
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const uint64_t idx, const uint8_t flags)
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{
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SCEnter();
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const PrefilterMpmKrb5Name *ctx = (const PrefilterMpmKrb5Name *)pectx;
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const MpmCtx *mpm_ctx = ctx->mpm_ctx;
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const int list_id = ctx->list_id;
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int local_id = 0;
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while(1) {
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// loop until we get a NULL
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struct Krb5PrincipalNameDataArgs cbdata = { local_id, txv };
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InspectionBuffer *buffer = GetKrb5SNameData(det_ctx, ctx->transforms,
|
||||
f, &cbdata, list_id, true);
|
||||
if (buffer == NULL)
|
||||
break;
|
||||
|
||||
if (buffer->inspect_len >= mpm_ctx->minlen) {
|
||||
(void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx,
|
||||
&det_ctx->mtcu, &det_ctx->pmq,
|
||||
buffer->inspect, buffer->inspect_len);
|
||||
}
|
||||
|
||||
local_id++;
|
||||
}
|
||||
}
|
||||
|
||||
static void PrefilterMpmKrb5NameFree(void *ptr)
|
||||
{
|
||||
SCFree(ptr);
|
||||
}
|
||||
|
||||
static int PrefilterMpmKrb5SNameRegister(DetectEngineCtx *de_ctx,
|
||||
SigGroupHead *sgh, MpmCtx *mpm_ctx,
|
||||
const DetectMpmAppLayerRegistery *mpm_reg, int list_id)
|
||||
{
|
||||
PrefilterMpmKrb5Name *pectx = SCCalloc(1, sizeof(*pectx));
|
||||
if (pectx == NULL)
|
||||
return -1;
|
||||
pectx->list_id = list_id;
|
||||
pectx->mpm_ctx = mpm_ctx;
|
||||
pectx->transforms = &mpm_reg->v2.transforms;
|
||||
|
||||
return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxKrb5SName,
|
||||
mpm_reg->v2.alproto, mpm_reg->v2.tx_min_progress,
|
||||
pectx, PrefilterMpmKrb5NameFree, mpm_reg->name);
|
||||
}
|
||||
|
||||
void DetectKrb5SNameRegister(void)
|
||||
{
|
||||
sigmatch_table[DETECT_AL_KRB5_SNAME].name = "krb5_sname";
|
||||
sigmatch_table[DETECT_AL_KRB5_SNAME].Setup = DetectKrb5SNameSetup;
|
||||
sigmatch_table[DETECT_AL_KRB5_SNAME].flags |= SIGMATCH_NOOPT;
|
||||
sigmatch_table[DETECT_AL_KRB5_SNAME].desc = "sticky buffer to match on Kerberos 5 server name";
|
||||
|
||||
DetectAppLayerMpmRegister2("krb5_sname", SIG_FLAG_TOCLIENT, 2,
|
||||
PrefilterMpmKrb5SNameRegister, NULL,
|
||||
ALPROTO_KRB5, 1);
|
||||
|
||||
DetectAppLayerInspectEngineRegister2("krb5_sname",
|
||||
ALPROTO_KRB5, SIG_FLAG_TOCLIENT, 0,
|
||||
DetectEngineInspectKrb5SName, NULL);
|
||||
|
||||
DetectBufferTypeSetDescriptionByName("krb5_sname",
|
||||
"Kerberos 5 ticket server name");
|
||||
|
||||
g_krb5_sname_buffer_id = DetectBufferTypeGetByName("krb5_sname");
|
||||
}
|
||||
|
||||
#else /* NO RUST */
|
||||
|
||||
void DetectKrb5SNameRegister(void) {}
|
||||
|
||||
#endif
|
||||
@ -0,0 +1,29 @@
|
||||
/* Copyright (C) 2015-2017 Open Information Security Foundation
|
||||
*
|
||||
* You can copy, redistribute or modify this Program under the terms of
|
||||
* the GNU General Public License version 2 as published by the Free
|
||||
* Software Foundation.
|
||||
*
|
||||
* 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
|
||||
* version 2 along with this program; if not, write to the Free Software
|
||||
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
|
||||
* 02110-1301, USA.
|
||||
*/
|
||||
|
||||
/**
|
||||
* \file
|
||||
*
|
||||
* \author Pierre Chifflier <chifflier@wzdftpd.net>
|
||||
*/
|
||||
|
||||
#ifndef __DETECT_KRB5_SNAME_H__
|
||||
#define __DETECT_KRB5_SNAME_H__
|
||||
|
||||
void DetectKrb5SNameRegister(void);
|
||||
|
||||
#endif /* __DETECT_KRB5_SNAME_H__ */
|
||||
Loading…
Reference in New Issue