suricata
alert-fastlog.c
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1 /* Copyright (C) 2007-2021 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  * Logs alerts in a line based text format compatible to Snort's
24  * alert_fast format.
25  */
26 
27 #include "suricata-common.h"
28 #include "debug.h"
29 #include "detect.h"
30 #include "flow.h"
31 #include "conf.h"
32 
33 #include "threads.h"
34 #include "tm-threads.h"
35 #include "threadvars.h"
36 #include "util-debug.h"
37 
38 #include "util-unittest.h"
39 #include "util-unittest-helper.h"
40 
41 #include "detect-parse.h"
42 #include "detect-engine.h"
43 #include "detect-engine-mpm.h"
44 #include "detect-reference.h"
46 
47 #include "output.h"
48 #include "alert-fastlog.h"
49 
50 #include "util-privs.h"
51 #include "util-print.h"
52 #include "util-proto-name.h"
53 #include "util-optimize.h"
54 #include "util-logopenfile.h"
55 #include "util-time.h"
56 
57 #define DEFAULT_LOG_FILENAME "fast.log"
58 
59 #define MODULE_NAME "AlertFastLog"
60 
61 /* The largest that size allowed for one alert string. */
62 #define MAX_FASTLOG_ALERT_SIZE 2048
63 /* The largest alert buffer that will be written at one time, possibly
64  * holding multiple alerts. */
65 #define MAX_FASTLOG_BUFFER_SIZE (2 * MAX_FASTLOG_ALERT_SIZE)
66 
67 TmEcode AlertFastLogThreadInit(ThreadVars *, const void *, void **);
69 void AlertFastLogRegisterTests(void);
70 static void AlertFastLogDeInitCtx(OutputCtx *);
71 
73 int AlertFastLogger(ThreadVars *tv, void *data, const Packet *p);
74 
76 {
81 }
82 
83 typedef struct AlertFastLogThread_ {
84  /** LogFileCtx has the pointer to the file and a mutex to allow multithreading */
87 
89 {
90  return (p->alerts.cnt ? TRUE : FALSE);
91 }
92 
93 static inline void AlertFastLogOutputAlert(AlertFastLogThread *aft, char *buffer,
94  int alert_size)
95 {
96  /* Output the alert string and count alerts. Only need to lock here. */
97  aft->file_ctx->Write(buffer, alert_size, aft->file_ctx);
98 }
99 
100 int AlertFastLogger(ThreadVars *tv, void *data, const Packet *p)
101 {
102  AlertFastLogThread *aft = (AlertFastLogThread *)data;
103  int i;
104  char timebuf[64];
105  int decoder_event = 0;
106 
107  CreateTimeString(&p->ts, timebuf, sizeof(timebuf));
108 
109  char srcip[46], dstip[46];
110  if (PKT_IS_IPV4(p)) {
111  PrintInet(AF_INET, (const void *)GET_IPV4_SRC_ADDR_PTR(p), srcip, sizeof(srcip));
112  PrintInet(AF_INET, (const void *)GET_IPV4_DST_ADDR_PTR(p), dstip, sizeof(dstip));
113  } else if (PKT_IS_IPV6(p)) {
114  PrintInet(AF_INET6, (const void *)GET_IPV6_SRC_ADDR(p), srcip, sizeof(srcip));
115  PrintInet(AF_INET6, (const void *)GET_IPV6_DST_ADDR(p), dstip, sizeof(dstip));
116  } else {
117  decoder_event = 1;
118  }
119 
120  /* Buffer to store the generated alert strings. The buffer is
121  * filled with alert strings until it doesn't have room to store
122  * another full alert, only then is the buffer written. This is
123  * more efficient for multiple alerts and only slightly slower for
124  * single alerts.
125  */
126  char alert_buffer[MAX_FASTLOG_BUFFER_SIZE];
127 
128  char proto[16] = "";
129  const char *protoptr;
131  protoptr = known_proto[IP_GET_IPPROTO(p)];
132  } else {
133  snprintf(proto, sizeof(proto), "PROTO:%03" PRIu32, IP_GET_IPPROTO(p));
134  protoptr = proto;
135  }
136  uint16_t src_port_or_icmp = p->sp;
137  uint16_t dst_port_or_icmp = p->dp;
138  if (IP_GET_IPPROTO(p) == IPPROTO_ICMP || IP_GET_IPPROTO(p) == IPPROTO_ICMPV6) {
139  src_port_or_icmp = p->icmp_s.type;
140  dst_port_or_icmp = p->icmp_s.code;
141  }
142  for (i = 0; i < p->alerts.cnt; i++) {
143  const PacketAlert *pa = &p->alerts.alerts[i];
144  if (unlikely(pa->s == NULL)) {
145  continue;
146  }
147 
148  const char *action = "";
149  if ((pa->action & ACTION_DROP) && EngineModeIsIPS()) {
150  action = "[Drop] ";
151  } else if (pa->action & ACTION_DROP) {
152  action = "[wDrop] ";
153  }
154 
155  /* Create the alert string without locking. */
156  int size = 0;
157  if (likely(decoder_event == 0)) {
158  PrintBufferData(alert_buffer, &size, MAX_FASTLOG_ALERT_SIZE,
159  "%s %s[**] [%" PRIu32 ":%" PRIu32 ":%"
160  PRIu32 "] %s [**] [Classification: %s] [Priority: %"PRIu32"]"
161  " {%s} %s:%" PRIu32 " -> %s:%" PRIu32 "\n", timebuf, action,
162  pa->s->gid, pa->s->id, pa->s->rev, pa->s->msg, pa->s->class_msg, pa->s->prio,
163  protoptr, srcip, src_port_or_icmp, dstip, dst_port_or_icmp);
164  } else {
165  PrintBufferData(alert_buffer, &size, MAX_FASTLOG_ALERT_SIZE,
166  "%s %s[**] [%" PRIu32 ":%" PRIu32
167  ":%" PRIu32 "] %s [**] [Classification: %s] [Priority: "
168  "%" PRIu32 "] [**] [Raw pkt: ", timebuf, action, pa->s->gid,
169  pa->s->id, pa->s->rev, pa->s->msg, pa->s->class_msg, pa->s->prio);
170  PrintBufferRawLineHex(alert_buffer, &size, MAX_FASTLOG_ALERT_SIZE,
171  GET_PKT_DATA(p), GET_PKT_LEN(p) < 32 ? GET_PKT_LEN(p) : 32);
172  if (p->pcap_cnt != 0) {
173  PrintBufferData(alert_buffer, &size, MAX_FASTLOG_ALERT_SIZE,
174  "] [pcap file packet: %"PRIu64"]\n", p->pcap_cnt);
175  } else {
176  PrintBufferData(alert_buffer, &size, MAX_FASTLOG_ALERT_SIZE, "]\n");
177  }
178  }
179 
180  /* Write the alert to output file */
181  AlertFastLogOutputAlert(aft, alert_buffer, size);
182  }
183 
184  return TM_ECODE_OK;
185 }
186 
187 TmEcode AlertFastLogThreadInit(ThreadVars *t, const void *initdata, void **data)
188 {
190  if (unlikely(aft == NULL))
191  return TM_ECODE_FAILED;
192  memset(aft, 0, sizeof(AlertFastLogThread));
193  if(initdata == NULL)
194  {
195  SCLogDebug("Error getting context for AlertFastLog. \"initdata\" argument NULL");
196  SCFree(aft);
197  return TM_ECODE_FAILED;
198  }
199  /** Use the Ouptut Context (file pointer and mutex) */
200  aft->file_ctx = ((OutputCtx *)initdata)->data;
201 
202  *data = (void *)aft;
203  return TM_ECODE_OK;
204 }
205 
207 {
208  AlertFastLogThread *aft = (AlertFastLogThread *)data;
209  if (aft == NULL) {
210  return TM_ECODE_OK;
211  }
212 
213  /* clear memory */
214  memset(aft, 0, sizeof(AlertFastLogThread));
215 
216  SCFree(aft);
217  return TM_ECODE_OK;
218 }
219 
220 /**
221  * \brief Create a new LogFileCtx for "fast" output style.
222  * \param conf The configuration node for this output.
223  * \return A LogFileCtx pointer on success, NULL on failure.
224  */
226 {
227  OutputInitResult result = { NULL, false };
228  LogFileCtx *logfile_ctx = LogFileNewCtx();
229  if (logfile_ctx == NULL) {
230  SCLogDebug("AlertFastLogInitCtx2: Could not create new LogFileCtx");
231  return result;
232  }
233 
234  if (SCConfLogOpenGeneric(conf, logfile_ctx, DEFAULT_LOG_FILENAME, 1) < 0) {
235  LogFileFreeCtx(logfile_ctx);
236  return result;
237  }
238 
239  OutputCtx *output_ctx = SCCalloc(1, sizeof(OutputCtx));
240  if (unlikely(output_ctx == NULL)) {
241  LogFileFreeCtx(logfile_ctx);
242  return result;
243  }
244 
245  output_ctx->data = logfile_ctx;
246  output_ctx->DeInit = AlertFastLogDeInitCtx;
247 
248  result.ctx = output_ctx;
249  result.ok = true;
250  return result;
251 }
252 
253 static void AlertFastLogDeInitCtx(OutputCtx *output_ctx)
254 {
255  LogFileCtx *logfile_ctx = (LogFileCtx *)output_ctx->data;
256  LogFileFreeCtx(logfile_ctx);
257  SCFree(output_ctx);
258 }
259 
260 /*------------------------------Unittests-------------------------------------*/
261 
262 #ifdef UNITTESTS
263 
264 static int AlertFastLogTest01(void)
265 {
266  uint8_t *buf = (uint8_t *) "GET /one/ HTTP/1.1\r\n"
267  "Host: one.example.org\r\n";
268 
269  uint16_t buflen = strlen((char *)buf);
270  Packet *p = NULL;
271  ThreadVars th_v;
272  DetectEngineThreadCtx *det_ctx;
273 
274  memset(&th_v, 0, sizeof(th_v));
275  p = UTHBuildPacket(buf, buflen, IPPROTO_TCP);
276 
278  FAIL_IF(de_ctx == NULL);
279 
280  de_ctx->flags |= DE_QUIET;
281 
284 
285  de_ctx->sig_list = SigInit(de_ctx, "alert tcp any any -> any any "
286  "(msg:\"FastLog test\"; content:\"GET\"; "
287  "Classtype:unknown; sid:1;)");
288 
290  DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
291 
292  SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
293  FAIL_IF_NOT(p->alerts.cnt == 1);
294  FAIL_IF_NOT(strcmp(p->alerts.alerts[0].s->class_msg, "Unknown are we") == 0);
295 
298  DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
300 
301  UTHFreePackets(&p, 1);
302  PASS;
303 }
304 
305 static int AlertFastLogTest02(void)
306 {
307  uint8_t *buf = (uint8_t *) "GET /one/ HTTP/1.1\r\n"
308  "Host: one.example.org\r\n";
309  uint16_t buflen = strlen((char *)buf);
310  Packet *p = NULL;
311  ThreadVars th_v;
312  DetectEngineThreadCtx *det_ctx;
313 
314  memset(&th_v, 0, sizeof(th_v));
315 
316  p = UTHBuildPacket(buf, buflen, IPPROTO_TCP);
317 
319  FAIL_IF(de_ctx == NULL);
320 
321  de_ctx->flags |= DE_QUIET;
322 
325 
326  de_ctx->sig_list = SigInit(de_ctx, "alert tcp any any -> any any "
327  "(msg:\"FastLog test\"; content:\"GET\"; "
328  "Classtype:unknown; sid:1;)");
329 
331  DetectEngineThreadCtxInit(&th_v, (void *)de_ctx, (void *)&det_ctx);
332 
333  SigMatchSignatures(&th_v, de_ctx, det_ctx, p);
334  FAIL_IF_NOT(p->alerts.cnt == 1);
335  FAIL_IF_NOT(strcmp(p->alerts.alerts[0].s->class_msg, "Unknown are we") == 0);
336 
339  DetectEngineThreadCtxDeinit(&th_v, (void *)det_ctx);
341 
342  UTHFreePackets(&p, 1);
343  PASS;
344 }
345 
346 #endif /* UNITTESTS */
347 
348 /**
349  * \brief This function registers unit tests for AlertFastLog API.
350  */
352 {
353 
354 #ifdef UNITTESTS
355 
356  UtRegisterTest("AlertFastLogTest01", AlertFastLogTest01);
357  UtRegisterTest("AlertFastLogTest02", AlertFastLogTest02);
358 
359 #endif /* UNITTESTS */
360 
361 }
tm-threads.h
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Definition: alert-fastlog.c:83
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int AlertFastLogger(ThreadVars *tv, void *data, const Packet *p)
Definition: alert-fastlog.c:100
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This function registers unit tests for AlertFastLog API.
Definition: alert-fastlog.c:351
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Definition: alert-fastlog.c:88
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Create a new LogFileCtx for "fast" output style.
Definition: alert-fastlog.c:225
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wrapper for old tests
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Definition: util-unittest-helper.c:468