suricata checkin based on commit id a4bce14770beee46a537eda3c3f6e8e8565d5d0a

Change-Id: I9a214fa0ee95e58fc640e50bd604dac7f42db48f

1 files changed, 156 insertions, 0 deletions

diff --git a/framework/src/suricata/src/detect-depth.c b/framework/src/suricata/src/detect-depth.c
new file mode 100644
index 00000000..f58438da
--- /dev/null
+++ b/framework/src/suricata/src/detect-depth.c
@@ -0,0 +1,156 @@
+/* Copyright (C) 2007-2010 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 Victor Julien <victor@inliniac.net>
+ * \author Anoop Saldanha <anoopsaldanha@gmail.com>
+ *
+ * Implements the depth keyword.
+ */
+
+#include "suricata-common.h"
+
+#include "decode.h"
+
+#include "detect.h"
+#include "detect-parse.h"
+#include "detect-content.h"
+#include "detect-uricontent.h"
+#include "detect-byte-extract.h"
+#include "detect-parse.h"
+
+#include "flow-var.h"
+#include "app-layer.h"
+
+#include "util-debug.h"
+
+static int DetectDepthSetup (DetectEngineCtx *, Signature *, char *);
+
+void DetectDepthRegister (void)
+{
+    sigmatch_table[DETECT_DEPTH].name = "depth";
+    sigmatch_table[DETECT_DEPTH].desc = "designate how many bytes from the beginning of the payload will be checked";
+    sigmatch_table[DETECT_DEPTH].url = "https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Payload_keywords#Depth";
+    sigmatch_table[DETECT_DEPTH].Match = NULL;
+    sigmatch_table[DETECT_DEPTH].Setup = DetectDepthSetup;
+    sigmatch_table[DETECT_DEPTH].Free  = NULL;
+    sigmatch_table[DETECT_DEPTH].RegisterTests = NULL;
+
+    sigmatch_table[DETECT_DEPTH].flags |= SIGMATCH_PAYLOAD;
+}
+
+static int DetectDepthSetup (DetectEngineCtx *de_ctx, Signature *s, char *depthstr)
+{
+    char *str = depthstr;
+    char dubbed = 0;
+    SigMatch *pm = NULL;
+    int ret = -1;
+
+    /* strip "'s */
+    if (depthstr[0] == '\"' && depthstr[strlen(depthstr) - 1] == '\"') {
+        str = SCStrdup(depthstr + 1);
+        if (unlikely(str == NULL))
+            goto end;
+        str[strlen(depthstr) - 2] = '\0';
+        dubbed = 1;
+    }
+
+    /* retrive the sm to apply the depth against */
+    if (s->list != DETECT_SM_LIST_NOTSET) {
+        pm = SigMatchGetLastSMFromLists(s, 2, DETECT_CONTENT, s->sm_lists_tail[s->list]);
+    } else {
+        pm =  SigMatchGetLastSMFromLists(s, 28,
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_PMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_UMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HRUDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HCBDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_FILEDATA],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HHDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HRHDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HMDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HCDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HSCDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HSMDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HUADMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HHHDMATCH],
+                                         DETECT_CONTENT, s->sm_lists_tail[DETECT_SM_LIST_HRHHDMATCH]);
+    }
+    if (pm == NULL) {
+        SCLogError(SC_ERR_DEPTH_MISSING_CONTENT, "depth needs "
+                   "preceding content, uricontent option, http_client_body, "
+                   "http_server_body, http_header option, http_raw_header option, "
+                   "http_method option, http_cookie, http_raw_uri, "
+                   "http_stat_msg, http_stat_code, http_user_agent, "
+                   "http_host, http_raw_host or "
+                   "file_data/dce_stub_data sticky buffer options");
+        goto end;
+    }
+
+    /* verify other conditions. */
+    DetectContentData *cd = (DetectContentData *)pm->ctx;
+
+    if (cd->flags & DETECT_CONTENT_DEPTH) {
+        SCLogError(SC_ERR_INVALID_SIGNATURE, "can't use multiple depths for the same content.");
+        goto end;
+    }
+    if ((cd->flags & DETECT_CONTENT_WITHIN) || (cd->flags & DETECT_CONTENT_DISTANCE)) {
+        SCLogError(SC_ERR_INVALID_SIGNATURE, "can't use a relative "
+                   "keyword like within/distance with a absolute "
+                   "relative keyword like depth/offset for the same "
+                   "content." );
+        goto end;
+    }
+    if (cd->flags & DETECT_CONTENT_NEGATED && cd->flags & DETECT_CONTENT_FAST_PATTERN) {
+        SCLogError(SC_ERR_INVALID_SIGNATURE, "can't have a relative "
+                   "negated keyword set along with a fast_pattern");
+        goto end;
+    }
+    if (cd->flags & DETECT_CONTENT_FAST_PATTERN_ONLY) {
+        SCLogError(SC_ERR_INVALID_SIGNATURE, "can't have a relative "
+                   "keyword set along with a fast_pattern:only;");
+        goto end;
+    }
+    if (str[0] != '-' && isalpha((unsigned char)str[0])) {
+        SigMatch *bed_sm = DetectByteExtractRetrieveSMVar(str, s);
+        if (bed_sm == NULL) {
+            SCLogError(SC_ERR_INVALID_SIGNATURE, "unknown byte_extract var "
+                       "seen in depth - %s\n", str);
+            goto end;
+        }
+        cd->depth = ((DetectByteExtractData *)bed_sm->ctx)->local_id;
+        cd->flags |= DETECT_CONTENT_DEPTH_BE;
+    } else {
+        cd->depth = (uint32_t)atoi(str);
+        if (cd->depth < cd->content_len) {
+            SCLogError(SC_ERR_INVALID_SIGNATURE, "depth - %"PRIu16
+                       " smaller than content length - %"PRIu32,
+                       cd->depth, cd->content_len);
+            goto end;
+        }
+        /* Now update the real limit, as depth is relative to the offset */
+        cd->depth += cd->offset;
+    }
+    cd->flags |= DETECT_CONTENT_DEPTH;
+
+    ret = 0;
+ end:
+    if (dubbed)
+        SCFree(str);
+    return ret;
+}