suricata
detect-filemagic.c
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1 /* Copyright (C) 2007-2023 Open Information Security Foundation
2  *
3  * You can copy, redistribute or modify this Program under the terms of
4  * the GNU General Public License version 2 as published by the Free
5  * Software Foundation.
6  *
7  * This program is distributed in the hope that it will be useful,
8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10  * GNU General Public License for more details.
11  *
12  * You should have received a copy of the GNU General Public License
13  * version 2 along with this program; if not, write to the Free Software
14  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
15  * 02110-1301, USA.
16  */
17 
18 /**
19  * \file
20  *
21  * \author Victor Julien <victor@inliniac.net>
22  *
23  */
24 
25 #include "suricata-common.h"
26 #include "threads.h"
27 #include "decode.h"
28 
29 #include "detect.h"
30 #include "detect-parse.h"
31 #include "detect-content.h"
32 
33 #include "detect-engine.h"
34 #include "detect-engine-buffer.h"
35 #include "detect-engine-mpm.h"
38 #include "detect-engine-file.h"
39 
40 #include "flow.h"
41 #include "flow-var.h"
42 #include "flow-util.h"
43 
44 #include "util-debug.h"
45 #include "util-spm-bm.h"
46 #include "util-magic.h"
47 #include "util-print.h"
48 
49 #include "util-unittest.h"
50 #include "util-unittest-helper.h"
51 #include "util-profiling.h"
52 
53 #include "app-layer.h"
54 #include "app-layer-parser.h"
55 
56 #include "stream-tcp.h"
57 
58 #include "detect-file-data.h"
59 #include "detect-filemagic.h"
60 
61 #include "conf.h"
62 
63 #ifndef HAVE_MAGIC
64 
65 static int DetectFilemagicSetupNoSupport (DetectEngineCtx *de_ctx, Signature *s, const char *str)
66 {
67  SCLogError("no libmagic support built in, needed for filemagic keyword");
68  return -1;
69 }
70 
71 /**
72  * \brief Registration function for keyword: filemagic
73  */
75 {
76  sigmatch_table[DETECT_FILEMAGIC].name = "filemagic";
77  sigmatch_table[DETECT_FILEMAGIC].desc = "match on the information libmagic returns about a file";
78  sigmatch_table[DETECT_FILEMAGIC].url = "/rules/file-keywords.html#filemagic";
79  sigmatch_table[DETECT_FILEMAGIC].Setup = DetectFilemagicSetupNoSupport;
81 }
82 
83 #else /* HAVE_MAGIC */
84 
85 typedef struct DetectFilemagicThreadData {
86  magic_t ctx;
87 } DetectFilemagicThreadData;
88 
89 static int DetectFilemagicSetup(DetectEngineCtx *, Signature *, const char *);
90 static int g_file_match_list_id = 0;
91 
92 static int DetectFilemagicSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
93 static int g_file_magic_buffer_id = 0;
94 
95 static int PrefilterMpmFilemagicRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
96  MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id);
97 static uint8_t DetectEngineInspectFilemagic(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
98  const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags,
99  void *alstate, void *txv, uint64_t tx_id);
100 
101 /**
102  * \brief Registration function for keyword: filemagic
103  */
104 void DetectFilemagicRegister(void)
105 {
106  sigmatch_table[DETECT_FILEMAGIC].name = "filemagic";
107  sigmatch_table[DETECT_FILEMAGIC].desc = "match on the information libmagic returns about a file";
108  sigmatch_table[DETECT_FILEMAGIC].url = "/rules/file-keywords.html#filemagic";
109  sigmatch_table[DETECT_FILEMAGIC].Setup = DetectFilemagicSetup;
112 
113  sigmatch_table[DETECT_FILE_MAGIC].name = "file.magic";
114  sigmatch_table[DETECT_FILE_MAGIC].desc = "sticky buffer to match on the file magic";
115  sigmatch_table[DETECT_FILE_MAGIC].url = "/rules/file-keywords.html#filemagic";
116  sigmatch_table[DETECT_FILE_MAGIC].Setup = DetectFilemagicSetupSticky;
119 
120  filehandler_table[DETECT_FILE_MAGIC].name = "file.magic",
122  filehandler_table[DETECT_FILE_MAGIC].PrefilterFn = PrefilterMpmFilemagicRegister;
123  filehandler_table[DETECT_FILE_MAGIC].Callback = DetectEngineInspectFilemagic;
124 
125  g_file_match_list_id = DetectBufferTypeRegister("files");
126 
127  DetectBufferTypeSetDescriptionByName("file.magic", "file magic");
129 
130  g_file_magic_buffer_id = DetectBufferTypeGetByName("file.magic");
131  SCLogDebug("registering filemagic rule option");
132 }
133 
134 #define FILEMAGIC_MIN_SIZE 512
135 
136 /**
137  * \brief run the magic check
138  *
139  * \param file the file
140  *
141  * \retval -1 error
142  * \retval 0 ok
143  */
144 int FilemagicThreadLookup(magic_t *ctx, File *file)
145 {
146  if (ctx == NULL || file == NULL || FileDataSize(file) == 0) {
147  SCReturnInt(-1);
148  }
149 
150  const uint8_t *data = NULL;
151  uint32_t data_len = 0;
152  uint64_t offset = 0;
153 
155  &data, &data_len, &offset);
156  if (offset == 0) {
157  if (FileDataSize(file) >= FILEMAGIC_MIN_SIZE) {
158  file->magic = MagicThreadLookup(ctx, data, data_len);
159  } else if (file->state >= FILE_STATE_CLOSED) {
160  file->magic = MagicThreadLookup(ctx, data, data_len);
161  }
162  }
163  SCReturnInt(0);
164 }
165 
166 static void *DetectFilemagicThreadInit(void *data /*@unused@*/)
167 {
168  DetectFilemagicThreadData *t = SCCalloc(1, sizeof(DetectFilemagicThreadData));
169  if (unlikely(t == NULL)) {
170  SCLogError("couldn't alloc ctx memory");
171  return NULL;
172  }
173 
174  t->ctx = MagicInitContext();
175  if (t->ctx == NULL)
176  goto error;
177 
178  return (void *)t;
179 
180 error:
181  if (t->ctx)
182  magic_close(t->ctx);
183  SCFree(t);
184  return NULL;
185 }
186 
187 static void DetectFilemagicThreadFree(void *ctx)
188 {
189  if (ctx != NULL) {
190  DetectFilemagicThreadData *t = (DetectFilemagicThreadData *)ctx;
191  if (t->ctx)
192  magic_close(t->ctx);
193  SCFree(t);
194  }
195 }
196 
197 /**
198  * \brief this function is used to parse filemagic options
199  * \brief into the current signature
200  *
201  * \param de_ctx pointer to the Detection Engine Context
202  * \param s pointer to the Current Signature
203  * \param str pointer to the user provided "filemagic" option
204  *
205  * \retval 0 on Success
206  * \retval -1 on Failure
207  */
208 static int DetectFilemagicSetup (DetectEngineCtx *de_ctx, Signature *s, const char *str)
209 {
210  if (s->init_data->transforms.cnt) {
211  SCLogError("previous transforms not consumed before 'filemagic'");
212  SCReturnInt(-1);
213  }
216 
217  if (DetectContentSetup(de_ctx, s, str) < 0) {
218  return -1;
219  }
220 
222  if (sm == NULL)
223  return -1;
224 
226  if (DetectContentConvertToNocase(de_ctx, cd) != 0)
227  return -1;
229  de_ctx, s, NULL, DETECT_FILE_MAGIC, g_file_magic_buffer_id, s->alproto) < 0)
230  return -1;
231 
232  if (de_ctx->filemagic_thread_ctx_id == -1) {
234  de_ctx, "filemagic", DetectFilemagicThreadInit, NULL, DetectFilemagicThreadFree, 1);
235  if (de_ctx->filemagic_thread_ctx_id == -1)
236  return -1;
237  }
238  return 0;
239 }
240 
241 /* file.magic implementation */
242 
243 /**
244  * \brief this function setup the file.magic keyword used in the rule
245  *
246  * \param de_ctx Pointer to the Detection Engine Context
247  * \param s Pointer to the Signature to which the current keyword belongs
248  * \param str Should hold an empty string always
249  *
250  * \retval 0 On success
251  */
252 static int DetectFilemagicSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
253 {
254  if (SCDetectBufferSetActiveList(de_ctx, s, g_file_magic_buffer_id) < 0)
255  return -1;
256 
257  if (de_ctx->filemagic_thread_ctx_id == -1) {
259  de_ctx, "filemagic", DetectFilemagicThreadInit, NULL, DetectFilemagicThreadFree, 1);
260  if (de_ctx->filemagic_thread_ctx_id == -1)
261  return -1;
262  }
263  return 0;
264 }
265 
266 static InspectionBuffer *FilemagicGetDataCallback(DetectEngineThreadCtx *det_ctx,
267  const DetectEngineTransforms *transforms, Flow *f, uint8_t flow_flags, File *cur_file,
268  int list_id, int local_file_id)
269 {
270  SCEnter();
271 
272  InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, local_file_id);
273  if (buffer == NULL)
274  return NULL;
275  if (buffer->initialized)
276  return buffer;
277 
278  if (cur_file->magic == NULL) {
279  DetectFilemagicThreadData *tfilemagic =
280  (DetectFilemagicThreadData *)DetectThreadCtxGetKeywordThreadCtx(
281  det_ctx, det_ctx->de_ctx->filemagic_thread_ctx_id);
282  if (tfilemagic == NULL) {
284  return NULL;
285  }
286 
287  FilemagicThreadLookup(&tfilemagic->ctx, cur_file);
288  }
289  if (cur_file->magic == NULL) {
290  return NULL;
291  }
292 
293  const uint8_t *data = (const uint8_t *)cur_file->magic;
294  uint32_t data_len = (uint32_t)strlen(cur_file->magic);
295 
296  InspectionBufferSetupMulti(det_ctx, buffer, transforms, data, data_len);
297 
298  SCReturnPtr(buffer, "InspectionBuffer");
299 }
300 
301 static uint8_t DetectEngineInspectFilemagic(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
302  const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags,
303  void *alstate, void *txv, uint64_t tx_id)
304 {
305  const DetectEngineTransforms *transforms = NULL;
306  if (!engine->mpm) {
307  transforms = engine->v2.transforms;
308  }
309 
310  AppLayerGetFileState files = AppLayerParserGetTxFiles(f, txv, flags);
311  FileContainer *ffc = files.fc;
312  if (ffc == NULL || ffc->head == NULL) {
313  const bool eof = (AppLayerParserGetStateProgress(f->proto, f->alproto, txv, flags) >
314  engine->progress);
315  if (eof && engine->match_on_null) {
317  }
318  if (ffc != NULL) {
320  }
322  }
323 
325  int local_file_id = 0;
326  for (File *file = ffc->head; file != NULL; file = file->next) {
327  InspectionBuffer *buffer = FilemagicGetDataCallback(
328  det_ctx, transforms, f, flags, file, engine->sm_list, local_file_id);
329  if (buffer == NULL)
330  continue;
331 
332  const bool match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd, NULL, f,
333  buffer->inspect, buffer->inspect_len, buffer->inspect_offset,
335  if (match) {
337  } else {
339  }
340  local_file_id++;
341  }
342  return r;
343 }
344 
345 typedef struct PrefilterMpmFilemagic {
346  int list_id;
347  const MpmCtx *mpm_ctx;
348  const DetectEngineTransforms *transforms;
349 } PrefilterMpmFilemagic;
350 
351 /** \brief Filedata Filedata Mpm prefilter callback
352  *
353  * \param det_ctx detection engine thread ctx
354  * \param p packet to inspect
355  * \param f flow to inspect
356  * \param txv tx to inspect
357  * \param pectx inspection context
358  */
359 static void PrefilterTxFilemagic(DetectEngineThreadCtx *det_ctx, const void *pectx, Packet *p,
360  Flow *f, void *txv, const uint64_t idx, const AppLayerTxData *txd, const uint8_t flags)
361 {
362  SCEnter();
363 
364  if (!AppLayerParserHasFilesInDir(txd, flags))
365  return;
366 
367  const PrefilterMpmFilemagic *ctx = (const PrefilterMpmFilemagic *)pectx;
368  const MpmCtx *mpm_ctx = ctx->mpm_ctx;
369  const int list_id = ctx->list_id;
370 
371  AppLayerGetFileState files = AppLayerParserGetTxFiles(f, txv, flags);
372  FileContainer *ffc = files.fc;
373  if (ffc != NULL) {
374  int local_file_id = 0;
375  for (File *file = ffc->head; file != NULL; file = file->next) {
376  InspectionBuffer *buffer = FilemagicGetDataCallback(
377  det_ctx, ctx->transforms, f, flags, file, list_id, local_file_id);
378  if (buffer == NULL)
379  continue;
380 
381  if (buffer->inspect_len >= mpm_ctx->minlen) {
382  (void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx, &det_ctx->mtc, &det_ctx->pmq,
383  buffer->inspect, buffer->inspect_len);
384  PREFILTER_PROFILING_ADD_BYTES(det_ctx, buffer->inspect_len);
385  }
386  local_file_id++;
387  }
388  }
389 }
390 
391 static void PrefilterMpmFilemagicFree(void *ptr)
392 {
393  SCFree(ptr);
394 }
395 
396 static int PrefilterMpmFilemagicRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
397  MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
398 {
399  PrefilterMpmFilemagic *pectx = SCCalloc(1, sizeof(*pectx));
400  if (pectx == NULL)
401  return -1;
402  pectx->list_id = list_id;
403  pectx->mpm_ctx = mpm_ctx;
404  pectx->transforms = &mpm_reg->transforms;
405 
406  return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxFilemagic,
407  mpm_reg->app_v2.alproto, mpm_reg->app_v2.tx_min_progress,
408  pectx, PrefilterMpmFilemagicFree, mpm_reg->pname);
409 }
410 
411 #endif /* HAVE_MAGIC */
DetectEngineAppInspectionEngine_
Definition: detect.h:437
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const char * url
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Definition: detect.h:441
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Container for matching data for a signature group.
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Retrieve thread local keyword ctx by id.
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DETECT_CONTENT
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one time registration of keywords at start up
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void DetectFilemagicRegister(void)
Registration function for keyword: filemagic.
Definition: detect-filemagic.c:74
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Definition: detect-engine-prefilter.c:352
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Definition: detect.h:383
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Definition: detect.h:381
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Definition: util-debug.h:261
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Definition: util-mem.h:61
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Signature_
Signature container.
Definition: detect.h:670
SigMatch_
a single match condition for a signature
Definition: detect.h:356
DetectEngineAppInspectionEngine_::transforms
const DetectEngineTransforms * transforms
Definition: detect.h:456
mpm_table
MpmTableElmt mpm_table[MPM_TABLE_SIZE]
Definition: util-mpm.c:47
DetectEngineTransforms::cnt
int cnt
Definition: detect.h:417
DetectFileHandlerTableElmt_::Callback
InspectEngineFuncPtr Callback
Definition: detect-parse.h:36
DetectEngineThreadCtx_::de_ctx
DetectEngineCtx * de_ctx
Definition: detect.h:1339
InspectionBufferMultipleForListGet
InspectionBuffer * InspectionBufferMultipleForListGet(DetectEngineThreadCtx *det_ctx, const int list_id, const uint32_t local_id)
for a InspectionBufferMultipleForList get a InspectionBuffer
Definition: detect-engine.c:1449
FILE_SIG_NEED_FILE
#define FILE_SIG_NEED_FILE
Definition: detect.h:319
DetectGetLastSMFromLists
SigMatch * DetectGetLastSMFromLists(const Signature *s,...)
Returns the sm with the largest index (added latest) from the lists passed to us.
Definition: detect-parse.c:640
DetectFileHandlerTableElmt_::name
const char * name
Definition: detect-parse.h:33
DetectBufferTypeSetDescriptionByName
void DetectBufferTypeSetDescriptionByName(const char *name, const char *desc)
Definition: detect-engine.c:1254
SignatureInitData_::transforms
DetectEngineTransforms transforms
Definition: detect.h:633
MpmCtx_
Definition: util-mpm.h:93
flow.h
DetectEngineContentInspection
bool DetectEngineContentInspection(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx, const Signature *s, const SigMatchData *smd, Packet *p, Flow *f, const uint8_t *buffer, const uint32_t buffer_len, const uint32_t stream_start_offset, const uint8_t flags, const enum DetectContentInspectionType inspection_mode)
wrapper around DetectEngineContentInspectionInternal to return true/false only
Definition: detect-engine-content-inspection.c:733
Flow_::alproto
AppProto alproto
application level protocol
Definition: flow.h:450
SCCalloc
#define SCCalloc(nm, sz)
Definition: util-mem.h:53
SCReturnInt
#define SCReturnInt(x)
Definition: util-debug.h:275
flow-var.h
InspectionBufferSetupMulti
void InspectionBufferSetupMulti(DetectEngineThreadCtx *det_ctx, InspectionBuffer *buffer, const DetectEngineTransforms *transforms, const uint8_t *data, const uint32_t data_len)
setup the buffer with our initial data
Definition: detect-engine.c:1530
app-layer.h
DetectBufferMpmRegistry_::pname
char pname[32]
Definition: detect.h:766