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-mpm.h"
37 #include "detect-engine-file.h"
38 
39 #include "flow.h"
40 #include "flow-var.h"
41 #include "flow-util.h"
42 
43 #include "util-debug.h"
44 #include "util-spm-bm.h"
45 #include "util-magic.h"
46 #include "util-print.h"
47 
48 #include "util-unittest.h"
49 #include "util-unittest-helper.h"
50 #include "util-profiling.h"
51 
52 #include "app-layer.h"
53 #include "app-layer-parser.h"
54 
55 #include "stream-tcp.h"
56 
57 #include "detect-file-data.h"
58 #include "detect-filemagic.h"
59 
60 #include "conf.h"
61 
62 #ifndef HAVE_MAGIC
63 
64 static int DetectFilemagicSetupNoSupport (DetectEngineCtx *de_ctx, Signature *s, const char *str)
65 {
66  SCLogError("no libmagic support built in, needed for filemagic keyword");
67  return -1;
68 }
69 
70 /**
71  * \brief Registration function for keyword: filemagic
72  */
74 {
75  sigmatch_table[DETECT_FILEMAGIC].name = "filemagic";
76  sigmatch_table[DETECT_FILEMAGIC].desc = "match on the information libmagic returns about a file";
77  sigmatch_table[DETECT_FILEMAGIC].url = "/rules/file-keywords.html#filemagic";
78  sigmatch_table[DETECT_FILEMAGIC].Setup = DetectFilemagicSetupNoSupport;
80 }
81 
82 #else /* HAVE_MAGIC */
83 
84 typedef struct DetectFilemagicThreadData {
85  magic_t ctx;
86 } DetectFilemagicThreadData;
87 
88 static int DetectFilemagicSetup(DetectEngineCtx *, Signature *, const char *);
89 static int g_file_match_list_id = 0;
90 
91 static int DetectFilemagicSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str);
92 static int g_file_magic_buffer_id = 0;
93 
94 static int PrefilterMpmFilemagicRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
95  MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id);
96 static uint8_t DetectEngineInspectFilemagic(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
97  const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags,
98  void *alstate, void *txv, uint64_t tx_id);
99 
100 /**
101  * \brief Registration function for keyword: filemagic
102  */
103 void DetectFilemagicRegister(void)
104 {
105  sigmatch_table[DETECT_FILEMAGIC].name = "filemagic";
106  sigmatch_table[DETECT_FILEMAGIC].desc = "match on the information libmagic returns about a file";
107  sigmatch_table[DETECT_FILEMAGIC].url = "/rules/file-keywords.html#filemagic";
108  sigmatch_table[DETECT_FILEMAGIC].Setup = DetectFilemagicSetup;
111 
112  sigmatch_table[DETECT_FILE_MAGIC].name = "file.magic";
113  sigmatch_table[DETECT_FILE_MAGIC].desc = "sticky buffer to match on the file magic";
114  sigmatch_table[DETECT_FILE_MAGIC].url = "/rules/file-keywords.html#filemagic";
115  sigmatch_table[DETECT_FILE_MAGIC].Setup = DetectFilemagicSetupSticky;
117 
118  filehandler_table[DETECT_FILE_MAGIC].name = "file.magic",
120  filehandler_table[DETECT_FILE_MAGIC].PrefilterFn = PrefilterMpmFilemagicRegister;
121  filehandler_table[DETECT_FILE_MAGIC].Callback = DetectEngineInspectFilemagic;
122 
123  g_file_match_list_id = DetectBufferTypeRegister("files");
124 
125  DetectBufferTypeSetDescriptionByName("file.magic", "file magic");
127 
128  g_file_magic_buffer_id = DetectBufferTypeGetByName("file.magic");
129  SCLogDebug("registering filemagic rule option");
130 }
131 
132 #define FILEMAGIC_MIN_SIZE 512
133 
134 /**
135  * \brief run the magic check
136  *
137  * \param file the file
138  *
139  * \retval -1 error
140  * \retval 0 ok
141  */
142 int FilemagicThreadLookup(magic_t *ctx, File *file)
143 {
144  if (ctx == NULL || file == NULL || FileDataSize(file) == 0) {
145  SCReturnInt(-1);
146  }
147 
148  const uint8_t *data = NULL;
149  uint32_t data_len = 0;
150  uint64_t offset = 0;
151 
153  &data, &data_len, &offset);
154  if (offset == 0) {
155  if (FileDataSize(file) >= FILEMAGIC_MIN_SIZE) {
156  file->magic = MagicThreadLookup(ctx, data, data_len);
157  } else if (file->state >= FILE_STATE_CLOSED) {
158  file->magic = MagicThreadLookup(ctx, data, data_len);
159  }
160  }
161  SCReturnInt(0);
162 }
163 
164 static void *DetectFilemagicThreadInit(void *data /*@unused@*/)
165 {
166  DetectFilemagicThreadData *t = SCCalloc(1, sizeof(DetectFilemagicThreadData));
167  if (unlikely(t == NULL)) {
168  SCLogError("couldn't alloc ctx memory");
169  return NULL;
170  }
171 
172  t->ctx = MagicInitContext();
173  if (t->ctx == NULL)
174  goto error;
175 
176  return (void *)t;
177 
178 error:
179  if (t->ctx)
180  magic_close(t->ctx);
181  SCFree(t);
182  return NULL;
183 }
184 
185 static void DetectFilemagicThreadFree(void *ctx)
186 {
187  if (ctx != NULL) {
188  DetectFilemagicThreadData *t = (DetectFilemagicThreadData *)ctx;
189  if (t->ctx)
190  magic_close(t->ctx);
191  SCFree(t);
192  }
193 }
194 
195 /**
196  * \brief this function is used to parse filemagic options
197  * \brief into the current signature
198  *
199  * \param de_ctx pointer to the Detection Engine Context
200  * \param s pointer to the Current Signature
201  * \param str pointer to the user provided "filemagic" option
202  *
203  * \retval 0 on Success
204  * \retval -1 on Failure
205  */
206 static int DetectFilemagicSetup (DetectEngineCtx *de_ctx, Signature *s, const char *str)
207 {
208  if (s->init_data->transforms.cnt) {
209  SCLogError("previous transforms not consumed before 'filemagic'");
210  SCReturnInt(-1);
211  }
214 
215  if (DetectContentSetup(de_ctx, s, str) < 0) {
216  return -1;
217  }
218 
220  if (sm == NULL)
221  return -1;
222 
224  if (DetectContentConvertToNocase(de_ctx, cd) != 0)
225  return -1;
227  de_ctx, s, NULL, DETECT_FILE_MAGIC, g_file_magic_buffer_id, s->alproto) < 0)
228  return -1;
229 
230  if (de_ctx->filemagic_thread_ctx_id == -1) {
232  de_ctx, "filemagic", DetectFilemagicThreadInit, NULL, DetectFilemagicThreadFree, 1);
233  if (de_ctx->filemagic_thread_ctx_id == -1)
234  return -1;
235  }
236  return 0;
237 }
238 
239 /* file.magic implementation */
240 
241 /**
242  * \brief this function setup the file.magic keyword used in the rule
243  *
244  * \param de_ctx Pointer to the Detection Engine Context
245  * \param s Pointer to the Signature to which the current keyword belongs
246  * \param str Should hold an empty string always
247  *
248  * \retval 0 On success
249  */
250 static int DetectFilemagicSetupSticky(DetectEngineCtx *de_ctx, Signature *s, const char *str)
251 {
252  if (DetectBufferSetActiveList(de_ctx, s, g_file_magic_buffer_id) < 0)
253  return -1;
254 
255  if (de_ctx->filemagic_thread_ctx_id == -1) {
257  de_ctx, "filemagic", DetectFilemagicThreadInit, NULL, DetectFilemagicThreadFree, 1);
258  if (de_ctx->filemagic_thread_ctx_id == -1)
259  return -1;
260  }
261  return 0;
262 }
263 
264 static InspectionBuffer *FilemagicGetDataCallback(DetectEngineThreadCtx *det_ctx,
265  const DetectEngineTransforms *transforms, Flow *f, uint8_t flow_flags, File *cur_file,
266  int list_id, int local_file_id)
267 {
268  SCEnter();
269 
270  InspectionBuffer *buffer = InspectionBufferMultipleForListGet(det_ctx, list_id, local_file_id);
271  if (buffer == NULL)
272  return NULL;
273  if (buffer->initialized)
274  return buffer;
275 
276  if (cur_file->magic == NULL) {
277  DetectFilemagicThreadData *tfilemagic =
278  (DetectFilemagicThreadData *)DetectThreadCtxGetKeywordThreadCtx(
279  det_ctx, det_ctx->de_ctx->filemagic_thread_ctx_id);
280  if (tfilemagic == NULL) {
282  return NULL;
283  }
284 
285  FilemagicThreadLookup(&tfilemagic->ctx, cur_file);
286  }
287  if (cur_file->magic == NULL) {
288  return NULL;
289  }
290 
291  const uint8_t *data = (const uint8_t *)cur_file->magic;
292  uint32_t data_len = (uint32_t)strlen(cur_file->magic);
293 
294  InspectionBufferSetupMulti(buffer, transforms, data, data_len);
295 
296  SCReturnPtr(buffer, "InspectionBuffer");
297 }
298 
299 static uint8_t DetectEngineInspectFilemagic(DetectEngineCtx *de_ctx, DetectEngineThreadCtx *det_ctx,
300  const DetectEngineAppInspectionEngine *engine, const Signature *s, Flow *f, uint8_t flags,
301  void *alstate, void *txv, uint64_t tx_id)
302 {
303  const DetectEngineTransforms *transforms = NULL;
304  if (!engine->mpm) {
305  transforms = engine->v2.transforms;
306  }
307 
308  AppLayerGetFileState files = AppLayerParserGetTxFiles(f, txv, flags);
309  FileContainer *ffc = files.fc;
310  if (ffc == NULL) {
312  }
313 
315  int local_file_id = 0;
316  for (File *file = ffc->head; file != NULL; file = file->next) {
317  InspectionBuffer *buffer = FilemagicGetDataCallback(
318  det_ctx, transforms, f, flags, file, engine->sm_list, local_file_id);
319  if (buffer == NULL)
320  continue;
321 
322  const bool match = DetectEngineContentInspection(de_ctx, det_ctx, s, engine->smd, NULL, f,
323  buffer->inspect, buffer->inspect_len, buffer->inspect_offset,
325  if (match) {
327  } else {
329  }
330  local_file_id++;
331  }
332  return r;
333 }
334 
335 typedef struct PrefilterMpmFilemagic {
336  int list_id;
337  const MpmCtx *mpm_ctx;
338  const DetectEngineTransforms *transforms;
339 } PrefilterMpmFilemagic;
340 
341 /** \brief Filedata Filedata Mpm prefilter callback
342  *
343  * \param det_ctx detection engine thread ctx
344  * \param p packet to inspect
345  * \param f flow to inspect
346  * \param txv tx to inspect
347  * \param pectx inspection context
348  */
349 static void PrefilterTxFilemagic(DetectEngineThreadCtx *det_ctx, const void *pectx, Packet *p,
350  Flow *f, void *txv, const uint64_t idx, const AppLayerTxData *txd, const uint8_t flags)
351 {
352  SCEnter();
353 
354  if (!AppLayerParserHasFilesInDir(txd, flags))
355  return;
356 
357  const PrefilterMpmFilemagic *ctx = (const PrefilterMpmFilemagic *)pectx;
358  const MpmCtx *mpm_ctx = ctx->mpm_ctx;
359  const int list_id = ctx->list_id;
360 
361  AppLayerGetFileState files = AppLayerParserGetTxFiles(f, txv, flags);
362  FileContainer *ffc = files.fc;
363  if (ffc != NULL) {
364  int local_file_id = 0;
365  for (File *file = ffc->head; file != NULL; file = file->next) {
366  InspectionBuffer *buffer = FilemagicGetDataCallback(
367  det_ctx, ctx->transforms, f, flags, file, list_id, local_file_id);
368  if (buffer == NULL)
369  continue;
370 
371  if (buffer->inspect_len >= mpm_ctx->minlen) {
372  (void)mpm_table[mpm_ctx->mpm_type].Search(mpm_ctx, &det_ctx->mtc, &det_ctx->pmq,
373  buffer->inspect, buffer->inspect_len);
374  PREFILTER_PROFILING_ADD_BYTES(det_ctx, buffer->inspect_len);
375  }
376  local_file_id++;
377  }
378  }
379 }
380 
381 static void PrefilterMpmFilemagicFree(void *ptr)
382 {
383  SCFree(ptr);
384 }
385 
386 static int PrefilterMpmFilemagicRegister(DetectEngineCtx *de_ctx, SigGroupHead *sgh,
387  MpmCtx *mpm_ctx, const DetectBufferMpmRegistry *mpm_reg, int list_id)
388 {
389  PrefilterMpmFilemagic *pectx = SCCalloc(1, sizeof(*pectx));
390  if (pectx == NULL)
391  return -1;
392  pectx->list_id = list_id;
393  pectx->mpm_ctx = mpm_ctx;
394  pectx->transforms = &mpm_reg->transforms;
395 
396  return PrefilterAppendTxEngine(de_ctx, sgh, PrefilterTxFilemagic,
397  mpm_reg->app_v2.alproto, mpm_reg->app_v2.tx_min_progress,
398  pectx, PrefilterMpmFilemagicFree, mpm_reg->pname);
399 }
400 
401 #endif /* HAVE_MAGIC */
DetectEngineAppInspectionEngine_
Definition: detect.h:429
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const char * url
Definition: detect.h:1307
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Definition: detect.h:433
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void * DetectThreadCtxGetKeywordThreadCtx(DetectEngineThreadCtx *det_ctx, int id)
Retrieve thread local keyword ctx by id.
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Definition: flow.h:356
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Definition: detect.h:685
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void DetectFilemagicRegister(void)
Registration function for keyword: filemagic.
Definition: detect-filemagic.c:73
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Definition: detect-engine-register.h:231
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Definition: detect-engine-prefilter.c:273
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Definition: detect.h:374
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Definition: util-debug.h:261
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Definition: util-mem.h:61
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Definition: detect.h:601
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Definition: detect.h:349
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Definition: detect.h:446
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Definition: detect.h:410
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Definition: detect-parse.h:36
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for a InspectionBufferMultipleForList get a InspectionBuffer
Definition: detect-engine.c:1518
FILE_SIG_NEED_FILE
#define FILE_SIG_NEED_FILE
Definition: detect.h:313
SIGMATCH_NOOPT
#define SIGMATCH_NOOPT
Definition: detect.h:1488
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:606
DetectFileHandlerTableElmt_::name
const char * name
Definition: detect-parse.h:33
DetectBufferTypeSetDescriptionByName
void DetectBufferTypeSetDescriptionByName(const char *name, const char *desc)
Definition: detect-engine.c:1188
SignatureInitData_::transforms
DetectEngineTransforms transforms
Definition: detect.h:573
MpmCtx_
Definition: util-mpm.h:88
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:717
SCCalloc
#define SCCalloc(nm, sz)
Definition: util-mem.h:53
SCReturnInt
#define SCReturnInt(x)
Definition: util-debug.h:275
flow-var.h
app-layer.h
DetectBufferMpmRegistry_::pname
char pname[32]
Definition: detect.h:687