[Oisf-users] Some problems with Suricata 3.1 using divert sockets

[C. L. Martinez]

Hi all,

 I have installed Suricata 3.1 under an OpenBSD 5.9 (fully patched) host to act as an IPS. I have configured pf to work with divert sockets:

block all
pass in inet proto tcp from 172.22.55.4 to !<internal_networks> tag 
intlans-to-inet
pass out quick on egress inet proto { tcp icmp udp } from 172.22.55.4 
divert-packet port 8000 nat-to (vio1:0)

 And I have configured a test rule with the following content:

drop tcp any any -> any any (msg:"OSNews is blocked"; content:"osnews.com"; http_header; nocase; classtype:policy-violation; sid:1;)

 ... but it doesn't works: Suricata doesn't trigger any alert (at this moment HOME_NET and EXTERNAL_NET have an "any"). Suricata is compiled with the following options:

root at obsdtest:/var/log/suricata# suricata --build-info    
This is Suricata version 3.1 RELEASE
Features: IPFW PCAP_SET_BUFF LIBPCAP_VERSION_MAJOR=1 HAVE_PACKET_FANOUT LIBNET1.1 HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HAVE_LUA HAVE_LUAJIT HAVE_LIBJANSSON 
SIMD support: none
Atomic intrisics: none
64-bits, Little-endian architecture
GCC version 4.2.1 20070719 , C version 199901
compiled with _FORTIFY_SOURCE=2
L1 cache line size (CLS)=64
thread local storage method: pthread key
compiled with LibHTP v0.5.20, linked against LibHTP v0.5.20

Suricata Configuration:
  AF_PACKET support:                       no
  PF_RING support:                         no
  NFQueue support:                         no
  NFLOG support:                           no
  IPFW support:                            yes
  Netmap support:                          no
  DAG enabled:                             no
  Napatech enabled:                        no

  Unix socket enabled:                     yes
  Detection enabled:                       yes

  libnss support:                          yes
  libnspr support:                         yes
  libjansson support:                      yes
  hiredis support:                         no
  Prelude support:                         no
  PCRE jit:                                yes
  LUA support:                             yes, through luajit
  libluajit:                               yes
  libgeoip:                                yes
  Non-bundled htp:                         no
  Old barnyard2 support:                   no
  CUDA enabled:                            no
  Hyperscan support:                       no
  Libnet support:                          yes

  Suricatasc install:                      no

  Profiling enabled:                       no
  Profiling locks enabled:                 no

Development settings:
  Coccinelle / spatch:                     no
  Unit tests enabled:                      no
  Debug output enabled:                    no
  Debug validation enabled:                no

Generic build parameters:
  Installation prefix:                     /opt/suricata
  Configuration directory:                 /etc/suricata/
  Log directory:                           /var/log/suricata/

  --prefix                                 /opt/suricata
  --sysconfdir                             /etc
  --localstatedir                          /var

  Host:                                    x86_64-unknown-openbsd5.9
  Compiler:                                gcc (exec name) / gcc (real)
  GCC Protect enabled:                     yes
  GCC march native enabled:                no
  GCC Profile enabled:                     no
  Position Independent Executable enabled: yes
  CFLAGS                                   -g -O2 -D__OpenBSD__
  PCAP_CFLAGS                              
  SECCFLAGS                                -fstack-protector -D_FORTIFY_SOURCE=2 -Wformat -Wformat-security



 Maybe exists some type of bug with divert sockets and Suricata??

Thanks.

-- 
Greetings,
C. L. Martinez