Snort 3 notes

Y M via Snort-devel <[email protected]> Sun, 11 Mar 2018 14:07:42 +0000

Newsgroups	gmane.comp.security.ids.snort.devel
Message-ID	<CY1PR17MB03622CBE271885A5DB83DBA4A8DC0@CY1PR17MB0362.namprd17.prod.outlook.com>

Hello,


I have been working with Snort 3 via a git clone recently and have documented some observations/questions along the way. Please don't take these as complaints 😊. I have put these into one email to reduce chatter. The Snort 3 version I am working with is at the end of this post.


# ---------

- Compiling Snort 3 from source with cmake on FreeBSD 11 generates the below error (cmake logs are attached) . However, compilation with automake/autoconf works as expected. In a recent post on the list, it was mentioned that automake maybe eventually removed.

-- Looking for iconv_open
-- Looking for iconv_open - found
-- Performing Test ICONV_COMPILES
-- Performing Test ICONV_COMPILES - Failed
CMake Error at cmake/FindICONV.cmake:130 (MESSAGE):
  Unable to determine iconv() signature
Call Stack (most recent call first):
  cmake/include_libraries.cmake:25 (find_package)
  CMakeLists.txt:17 (include)
-- Configuring incomplete, errors occurred!
# ----------
- Does the Reputation inspector support multiple blacklist/whitelist entries? For example, using the below reputation configuration for single-list entries
reputation =
{
    blacklist = BLACK_LIST_PATH .. '/ip-blacklist',
    whitelist = WHITE_LIST_PATH .. '/ip-whitelist'
}

Snort prints out the status of the IP lists processing as follows:
...
Processing blacklist file /usr/local/snort/etc/snort/../../intel/ip-blacklist
Reputation entries loaded: 1544, invalid: 0, re-defined: 0 (from file /usr/local/snort/etc/snort/../../intel/ip-blacklist)
Processing whitelist file /usr/local/snort/etc/snort/../../intel/ip-whitelist
Reputation entries loaded: 0, invalid: 0, re-defined: 0 (from file /usr/local/snort/etc/snort/../../intel/ip-whitelist)
...
However, using Snort 2.x syntax or the below configuration for multiple list entries per category,
reputation =
{
    blacklist =
    {
        BLACK_LIST_PATH .. '/ip-blacklist',
        BLACK_LIST_PATH .. '/ip-blk'
    },
    whitelist = WHITE_LIST_PATH .. '/ip-whitelist'
}

Snort generates the warning message copied below:
WARNING: reputation: can't find any whitelist/blacklist entries; disabled.

I also tried with [[ multiline string ]] syntax, which does not appear to be an accepted format.

# -----

- The file_id inspector does not appear to have graylist/blacklist options. Does the file_policy[] item substitute these options?

# -----
- Some sections in the online documentation reference the use of --warn-unknown. This option appears to be no available anymore? For example, in the Tips section of the online manual, under the "Lua Configuration" section, however using the option returns unknown options.
# /usr/local/snort/bin/snort -c /usr/local/snort/etc/snort/snort.lua --warn-unknown
ERROR: unknown option --warn-unknown
FATAL: see prior 1 errors
Fatal Error, Quitting..

# -----
- Using a wrong syntax for configuring the daq module as below, Snort silently accepts the wrong syntax, and as expected, Snort does not apply the configuration. This was tested with --warn-all. This can be overlooked sometimes.
daq =
{
    module_dirs = '/usr/local/lib/daq',
    -- must enclose module with quotes
    module = afpacket,
}

# -----

- While listed as an optional requirement, safec does appear to compile successfully on FreeBSD 11, and generates the below error. Is it safe to ignore safec or is there a workaround that we can attempt?
In file included from ../include/safe_lib.h:58:0,
                 from safeclib/safeclib_private.h:91,
                 from safeclib/safe_mem_constraint.c:33:
../include/safe_mem_lib.h:87:16: error: conflicting types for 'memset_s'
 extern errno_t memset_s(void *dest, rsize_t dmax, uint8_t value);
                ^~~~~~~~
In file included from safeclib/safeclib_private.h:70:0,
                 from safeclib/safe_mem_constraint.c:33:
/usr/include/string.h:158:9: note: previous declaration of 'memset_s' was here
 errno_t memset_s(void *, rsize_t, int, rsize_t);
         ^~~~~~~~
*** Error code 1
Stop.
make[2]: stopped in /root/sources/libsafec-10052013/src
*** Error code 1
Stop.
make[1]: stopped in /root/sources/libsafec-10052013
*** Error code 1

Thanks for reading thus far.
YM

Snort 3 version:
# /usr/local/snort/bin/snort -V
   ,,_     -*> Snort++ <*-
  o"  )~   Version 3.0.0 (Build 243) from 2.9.11
   ''''    By Martin Roesch & The Snort Team
           http://snort.org/contact#team
           Copyright (C) 2014-2018 Cisco and/or its affiliates. All rights reserved.
           Copyright (C) 1998-2013 Sourcefire, Inc., et al.
           Using DAQ version 2.2.2
           Using LuaJIT version 2.0.5
           Using OpenSSL 1.0.2k-fips  26 Jan 2017
           Using libpcap version 1.8.1
           Using PCRE version 8.41 2017-07-05
           Using ZLIB version 1.2.7
           Using FlatBuffers 1.8.0
           Using Hyperscan version 4.7.0 2018-03-05
           Using LZMA version 5.2.2

_______________________________________________
Snort-devel mailing list
[email protected]
https://lists.snort.org/mailman/listinfo/snort-devel

Please visit http://blog.snort.org for the latest news about Snort!

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Detecting CXX [-std=c++11] compiler features compiled with the following output:
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Run Build Command:"/usr/bin/make" "cmTC_ce762/fast"
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Linking CXX executable cmTC_ce762
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Detecting CXX [-std=c++98] compiler features compiled with the following output:
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Run Build Command:"/usr/bin/make" "cmTC_fbf5a/fast"
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Linking CXX executable cmTC_fbf5a
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Determining if the C compiler works passed with the following output:
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Run Build Command:"/usr/bin/make" "cmTC_652a1/fast"
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Linking C executable cmTC_652a1
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Detecting C compiler ABI info compiled with the following output:
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Run Build Command:"/usr/bin/make" "cmTC_bd717/fast"
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Parsed C implicit link information from above output:
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Detecting C [-std=c11] compiler features compiled with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_8b326/fast"
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Linking C executable cmTC_8b326
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Detecting C [-std=c99] compiler features compiled with the following output:
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Run Build Command:"/usr/bin/make" "cmTC_79b36/fast"
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Linking C executable cmTC_79b36
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Detecting C [-std=c90] compiler features compiled with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_f9ca6/fast"
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Building C object CMakeFiles/cmTC_f9ca6.dir/feature_tests.c.o
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Linking C executable cmTC_f9ca6
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Determining if the include file pthread.h exists passed with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_ad587/fast"
/usr/bin/make -f CMakeFiles/cmTC_ad587.dir/build.make CMakeFiles/cmTC_ad587.dir/build
Building C object CMakeFiles/cmTC_ad587.dir/CheckIncludeFile.c.o
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Linking C executable cmTC_ad587
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Determining if the function pthread_create exists in the pthread passed with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_c2e9a/fast"
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Linking C executable cmTC_c2e9a
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Run Build Command:"/usr/bin/make" "cmTC_5ab03/fast"
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Linking C executable cmTC_5ab03
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Source file was:
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Determining if the function lzma_auto_decoder exists in the /usr/lib/liblzma.so passed with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_346d8/fast"
/usr/bin/make -f CMakeFiles/cmTC_346d8.dir/build.make CMakeFiles/cmTC_346d8.dir/build
Building C object CMakeFiles/cmTC_346d8.dir/CheckFunctionExists.c.o
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Linking C executable cmTC_346d8
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Determining if the function lzma_easy_encoder exists in the /usr/lib/liblzma.so passed with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_55bd1/fast"
/usr/bin/make -f CMakeFiles/cmTC_55bd1.dir/build.make CMakeFiles/cmTC_55bd1.dir/build
Building C object CMakeFiles/cmTC_55bd1.dir/CheckFunctionExists.c.o
/usr/bin/cc   -DCHECK_FUNCTION_EXISTS=lzma_easy_encoder -o CMakeFiles/cmTC_55bd1.dir/CheckFunctionExists.c.o   -c /usr/local/share/cmake/Modules/CheckFunctionExists.c
Linking C executable cmTC_55bd1
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Determining if the function lzma_lzma_preset exists in the /usr/lib/liblzma.so passed with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_6b23b/fast"
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Building C object CMakeFiles/cmTC_6b23b.dir/CheckFunctionExists.c.o
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Linking C executable cmTC_6b23b
/usr/local/bin/cmake -E cmake_link_script CMakeFiles/cmTC_6b23b.dir/link.txt --verbose=1
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Determining if the function iconv_open exists passed with the following output:
Change Dir: /root/sources/snort3/build/CMakeFiles/CMakeTmp

Run Build Command:"/usr/bin/make" "cmTC_ebac7/fast"
/usr/bin/make -f CMakeFiles/cmTC_ebac7.dir/build.make CMakeFiles/cmTC_ebac7.dir/build
Building C object CMakeFiles/cmTC_ebac7.dir/CheckFunctionExists.c.o
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