src/detect-ike-nonce-payload.c

   1 /* Copyright (C) 2020 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  *
  20  * \author Frank Honza <frank.honza@dcso.de>
  21  */
  22
  23 #include "suricata-common.h"
  24 #include "threads.h"
  25 #include "debug.h"
  26 #include "decode.h"
  27 #include "detect.h"
  28
  29 #include "detect-parse.h"
  30 #include "detect-engine.h"
  31 #include "detect-engine-mpm.h"
  32 #include "detect-engine-prefilter.h"
  33 #include "detect-urilen.h"
  34
  35 #include "flow.h"
  36 #include "flow-var.h"
  37 #include "flow-util.h"
  38
  39 #include "util-debug.h"
  40 #include "util-unittest.h"
  41 #include "util-unittest-helper.h"
  42 #include "util-spm.h"
  43
  44 #include "app-layer.h"
  45 #include "app-layer-parser.h"
  46
  47 #include "detect-ike-nonce-payload.h"
  48 #include "stream-tcp.h"
  49
  50 #include "rust.h"
  51 #include "app-layer-ike.h"
  52 #include "rust-bindings.h"
  53
  54 #define KEYWORD_NAME_NONCE "ike.nonce_payload"
  55 #define KEYWORD_DOC_NONCE  "ike-keywords.html#ike-nonce_payload";
  56 #define BUFFER_NAME_NONCE  "ike.nonce_payload"
  57 #define BUFFER_DESC_NONCE  "ike nonce payload"
  58
  59 static int g_buffer_nonce_id = 0;
  60
  61 static int DetectNonceSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str)
  62 {
  63     if (DetectBufferSetActiveList(s, g_buffer_nonce_id) < 0)
  64         return -1;
  65
  66     if (DetectSignatureSetAppProto(s, ALPROTO_IKE) < 0)
  67         return -1;
  68
  69     return 0;
  70 }
  71
  72 static InspectionBuffer *GetNonceData(DetectEngineThreadCtx *det_ctx,
  73         const DetectEngineTransforms *transforms, Flow *_f, const uint8_t _flow_flags, void *txv,
  74         const int list_id)
  75 {
  76     InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id);
  77     if (buffer->inspect == NULL) {
  78         const uint8_t *b = NULL;
  79         uint32_t b_len = 0;
  80
  81         if (rs_ike_state_get_nonce(txv, &b, &b_len) != 1)
  82             return NULL;
  83         if (b == NULL || b_len == 0)
  84             return NULL;
  85
  86         InspectionBufferSetup(det_ctx, list_id, buffer, b, b_len);
  87         InspectionBufferApplyTransforms(buffer, transforms);
  88     }
  89
  90     return buffer;
  91 }
  92
  93 void DetectIkeNonceRegister(void)
  94 {
  95     // register nonce
  96     sigmatch_table[DETECT_AL_IKE_NONCE].name = KEYWORD_NAME_NONCE;
  97     sigmatch_table[DETECT_AL_IKE_NONCE].url =
  98             "/rules/" KEYWORD_DOC_NONCE sigmatch_table[DETECT_AL_IKE_NONCE].desc =
  99                     "sticky buffer to match on the IKE nonce_payload";
 100     sigmatch_table[DETECT_AL_IKE_NONCE].Setup = DetectNonceSetup;
 101     sigmatch_table[DETECT_AL_IKE_NONCE].flags |= SIGMATCH_NOOPT | SIGMATCH_INFO_STICKY_BUFFER;
 102
 103     DetectAppLayerInspectEngineRegister2(BUFFER_NAME_NONCE, ALPROTO_IKE, SIG_FLAG_TOSERVER, 1,
 104             DetectEngineInspectBufferGeneric, GetNonceData);
 105
 106     DetectAppLayerMpmRegister2(BUFFER_NAME_NONCE, SIG_FLAG_TOSERVER, 1, PrefilterGenericMpmRegister,
 107             GetNonceData, ALPROTO_IKE, 1);
 108
 109     DetectAppLayerInspectEngineRegister2(BUFFER_NAME_NONCE, ALPROTO_IKE, SIG_FLAG_TOCLIENT, 1,
 110             DetectEngineInspectBufferGeneric, GetNonceData);
 111
 112     DetectAppLayerMpmRegister2(BUFFER_NAME_NONCE, SIG_FLAG_TOCLIENT, 1, PrefilterGenericMpmRegister,
 113             GetNonceData, ALPROTO_IKE, 1);
 114
 115     DetectBufferTypeSetDescriptionByName(BUFFER_NAME_NONCE, BUFFER_DESC_NONCE);
 116
 117     g_buffer_nonce_id = DetectBufferTypeGetByName(BUFFER_NAME_NONCE);
 118     SCLogDebug("registering " BUFFER_NAME_NONCE " rule option");
 119 }