From: Giuseppe Longo Date: Sat, 2 Mar 2019 20:45:07 +0000 (+0100) Subject: detect/sip.stat_msg: add sticky buffer X-Git-Tag: suricata-5.0.0-rc1~31 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8939ece53846de2795319003b991fcc7da04bf37;p=thirdparty%2Fsuricata.git detect/sip.stat_msg: add sticky buffer Matches on status msg field in SIP. --- diff --git a/rust/src/sip/detect.rs b/rust/src/sip/detect.rs index 53684baa9d..0ca2940112 100644 --- a/rust/src/sip/detect.rs +++ b/rust/src/sip/detect.rs @@ -120,3 +120,24 @@ pub unsafe extern "C" fn rs_sip_tx_get_stat_code(tx: &mut SIPTransaction, return 0; } + +#[no_mangle] +pub unsafe extern "C" fn rs_sip_tx_get_stat_msg(tx: &mut SIPTransaction, + buffer: *mut *const u8, + buffer_len: *mut u32) + -> u8 +{ + if let Some(ref r) = tx.response { + let re = &r.reason; + if re.len() > 0 { + *buffer = re.as_ptr(); + *buffer_len = re.len() as u32; + return 1; + } + } + + *buffer = ptr::null(); + *buffer_len = 0; + + return 0; +} diff --git a/src/Makefile.am b/src/Makefile.am index 2b98a9259f..1aca38f554 100755 --- a/src/Makefile.am +++ b/src/Makefile.am @@ -249,6 +249,7 @@ detect-sip-method.c detect-sip-method.h \ detect-sip-uri.c detect-sip-uri.h \ detect-sip-protocol.c detect-sip-protocol.h \ detect-sip-stat-code.c detect-sip-stat-code.h \ +detect-sip-stat-msg.c detect-sip-stat-msg.h \ detect-ssh-proto.c detect-ssh-proto.h \ detect-ssh-proto-version.c detect-ssh-proto-version.h \ detect-ssh-software.c detect-ssh-software.h \ diff --git a/src/detect-engine-register.c b/src/detect-engine-register.c index 34fcc00756..6bbd758d63 100644 --- a/src/detect-engine-register.c +++ b/src/detect-engine-register.c @@ -183,6 +183,7 @@ #include "detect-sip-uri.h" #include "detect-sip-protocol.h" #include "detect-sip-stat-code.h" +#include "detect-sip-stat-msg.h" #include "detect-target.h" #include "detect-template-rust-buffer.h" #include "detect-snmp-version.h" @@ -552,6 +553,7 @@ void SigTableSetup(void) DetectSipUriRegister(); DetectSipProtocolRegister(); DetectSipStatCodeRegister(); + DetectSipStatMsgRegister(); DetectTargetRegister(); DetectTemplateRustBufferRegister(); DetectSNMPVersionRegister(); diff --git a/src/detect-engine-register.h b/src/detect-engine-register.h index 28b9f04001..f980a7a7aa 100644 --- a/src/detect-engine-register.h +++ b/src/detect-engine-register.h @@ -230,6 +230,7 @@ enum { DETECT_AL_SIP_URI, DETECT_AL_SIP_PROTOCOL, DETECT_AL_SIP_STAT_CODE, + DETECT_AL_SIP_STAT_MSG, DETECT_TEMPLATE, DETECT_TEMPLATE2, diff --git a/src/detect-sip-stat-msg.c b/src/detect-sip-stat-msg.c new file mode 100644 index 0000000000..ffc3aaca2b --- /dev/null +++ b/src/detect-sip-stat-msg.c @@ -0,0 +1,121 @@ +/* Copyright (C) 2019 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. + */ + +/** + * + * \author Giuseppe Longo + * + * Implements the sip.stat_msg sticky buffer + * + */ + +#include "suricata-common.h" +#include "threads.h" +#include "debug.h" +#include "decode.h" +#include "detect.h" + +#include "detect-parse.h" +#include "detect-engine.h" +#include "detect-engine-mpm.h" +#include "detect-engine-prefilter.h" +#include "detect-content.h" +#include "detect-pcre.h" +#include "detect-urilen.h" + +#include "flow.h" +#include "flow-var.h" +#include "flow-util.h" + +#include "util-debug.h" +#include "util-unittest.h" +#include "util-unittest-helper.h" +#include "util-spm.h" + +#include "app-layer.h" +#include "app-layer-parser.h" + +#include "detect-sip-stat-msg.h" +#include "stream-tcp.h" + +#include "rust.h" +#include "app-layer-sip.h" +#include "rust-sip-detect-gen.h" + +#define KEYWORD_NAME "sip.stat_msg" +#define KEYWORD_DOC "sip-keywords.html#sip-stat-msg" +#define BUFFER_NAME "sip.stat_msg" +#define BUFFER_DESC "sip response status message" +static int g_buffer_id = 0; + +static int DetectSipStatMsgSetup(DetectEngineCtx *de_ctx, Signature *s, const char *str) +{ + if (DetectBufferSetActiveList(s, g_buffer_id) < 0) + return -1; + + if (DetectSignatureSetAppProto(s, ALPROTO_SIP) < 0) + return -1; + + return 0; +} + +static InspectionBuffer *GetData(DetectEngineThreadCtx *det_ctx, + const DetectEngineTransforms *transforms, Flow *_f, + const uint8_t _flow_flags, void *txv, const int list_id) +{ + SCEnter(); + + InspectionBuffer *buffer = InspectionBufferGet(det_ctx, list_id); + if (buffer->inspect == NULL) { + const uint8_t *b = NULL; + uint32_t b_len = 0; + + if (rs_sip_tx_get_stat_msg(txv, &b, &b_len) != 1) + return NULL; + if (b == NULL || b_len == 0) + return NULL; + + InspectionBufferSetup(buffer, b, b_len); + InspectionBufferApplyTransforms(buffer, transforms); + } + + return buffer; +} + +void DetectSipStatMsgRegister (void) +{ + /* sip.stat_msg sticky buffer */ + sigmatch_table[DETECT_AL_SIP_STAT_MSG].name = KEYWORD_NAME; + sigmatch_table[DETECT_AL_SIP_STAT_MSG].desc = "sticky buffer to match on the SIP status message"; + sigmatch_table[DETECT_AL_SIP_STAT_MSG].url = DOC_URL DOC_VERSION "/rules/" KEYWORD_DOC; + sigmatch_table[DETECT_AL_SIP_STAT_MSG].Setup = DetectSipStatMsgSetup; + sigmatch_table[DETECT_AL_SIP_STAT_MSG].flags |= SIGMATCH_NOOPT; + + DetectAppLayerInspectEngineRegister2(BUFFER_NAME, ALPROTO_SIP, + SIG_FLAG_TOCLIENT, 1, + DetectEngineInspectBufferGeneric, GetData); + + DetectAppLayerMpmRegister2(BUFFER_NAME, SIG_FLAG_TOCLIENT, 3, + PrefilterGenericMpmRegister, GetData, ALPROTO_SIP, + 1); + + DetectBufferTypeSetDescriptionByName(BUFFER_NAME, BUFFER_DESC); + + g_buffer_id = DetectBufferTypeGetByName(BUFFER_NAME); + + SCLogDebug("registering " BUFFER_NAME " rule option"); +} diff --git a/src/detect-sip-stat-msg.h b/src/detect-sip-stat-msg.h new file mode 100644 index 0000000000..29b2e21515 --- /dev/null +++ b/src/detect-sip-stat-msg.h @@ -0,0 +1,29 @@ +/* Copyright (C) 2019 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 Giuseppe Longo + */ + +#ifndef __DETECT_SIP_STAT_MSG_H__ +#define __DETECT_SIP_STAT_MSG_H__ + +void DetectSipStatMsgRegister(void); + +#endif /* __DETECT_SIP_STAT_MSG_H__ */