Suricata

Using -

This is Suricata version 4.1.0-dev (rev d2121945)
Features: PCAP_SET_BUFF AF_PACKET HAVE_PACKET_FANOUT LIBCAP_NG LIBNET1.1 HAVE_HTP_URI_NORMALIZE_HOOK PCRE_JIT HAVE_NSS HAVE_LUA HAVE_LUAJIT HAVE_LIBJANSSON TLS MAGIC 
SIMD support: SSE_4_2 SSE_4_1 SSE_3 
Atomic intrisics: 1 2 4 8 16 byte(s)
64-bits, Little-endian architecture
GCC version 6.3.0 20170516, C version 199901
compiled with _FORTIFY_SOURCE=0
L1 cache line size (CLS)=64
thread local storage method: __thread
compiled with LibHTP v0.5.25, linked against LibHTP v0.5.25

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

  Unix socket enabled:                     yes
  Detection enabled:                       yes

  Libmagic support:                        yes
  libnss support:                          yes
  libnspr support:                         yes
  libjansson support:                      yes
  liblzma support:                         no
  hiredis support:                         no
  hiredis async with libevent:             no
  Prelude support:                         no
  PCRE jit:                                yes
  LUA support:                             yes, through luajit
  libluajit:                               yes
  libgeoip:                                yes
  Non-bundled htp:                         no
  Old barnyard2 support:                   no
  Hyperscan support:                       no
  Libnet support:                          yes

  Rust support (experimental):             no
  Experimental Rust parsers:               no
  Rust strict mode:                        no
  Rust debug mode:                         no

  Suricatasc install:                      yes

  Profiling enabled:                       no
  Profiling locks enabled:                 no

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

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

  --prefix                                 /usr
  --sysconfdir                             /etc
  --localstatedir                          /var

  Host:                                    x86_64-pc-linux-gnu
  Compiler:                                gcc (exec name) / gcc (real)
  GCC Protect enabled:                     no
  GCC march native enabled:                yes
  GCC Profile enabled:                     no
  Position Independent Executable enabled: no
  CFLAGS                                   -ggdb -O0 -march=native
  PCAP_CFLAGS                               -I/usr/include
  SECCFLAGS                               

sudo suricata -S tls-only.rules -l log/ --engine-analysis
...
grep 'on "" buffer'  log/rules_analysis.txt 
    Fast Pattern "cn=*.onion." on "" buffer.
    Fast Pattern "O=Let's Encrypt" on "" buffer.
    Fast Pattern ".gq" on "" buffer.
    Fast Pattern ".ga" on "" buffer.
    Fast Pattern ".ml" on "" buffer.
    Fast Pattern ".cf" on "" buffer.
    Fast Pattern ".gdn" on "" buffer.
    Fast Pattern "Let's Encrypt" on "" buffer.
    Fast Pattern "Let's Encrypt" on "" buffer.
    Fast Pattern "Let's Encrypt" on "" buffer.
    Fast Pattern "Let's Encrypt" on "" buffer.
    Fast Pattern "Let's Encrypt" on "" buffer.
    Fast Pattern "Let's Encrypt" on "" buffer.
    Fast Pattern "O=Internet Widgits Pty Ltd" on "" buffer.
    Fast Pattern "check.torproject.org" on "" buffer.
    Fast Pattern "CN=api.ipify.org" on "" buffer.
    Fast Pattern "LogMeIn, Inc." on "" buffer.
    Fast Pattern "0A:E1:E6:BD:51:FB:3D:8F:06:BE:0D:B5:5E:BD:E9:DF" on "" buffer.
    Fast Pattern "00:E7:F9:B6:DE:A6:57:93:E2:44:6A:3B:95:C6:B3:EC:DF" on "" buffer.
    Fast Pattern "l2.io" on "" buffer.
    Fast Pattern ".localtunnel.me" on "" buffer.
    Fast Pattern "O=MyCompany Ltd." on "" buffer.
    Fast Pattern "cn=processamentos.com.br" on "" buffer.
    Fast Pattern "cn=robervalmotores.com.br" on "" buffer.
    Fast Pattern "C=AU, ST=f2tee4, L=gf23et65adt, O=tg4r6tds, OU=rst, CN=rvgvtfdf" on "" buffer.
    Fast Pattern "89:BF:80:13:42:0A:2E:F5" on "" buffer.
    Fast Pattern "cryptoclipper.ru" on "" buffer.
    Fast Pattern "70:FE:E3:2F" on "" buffer.
    Fast Pattern "projectevrial.ru" on "" buffer.

seems not to print the buffers it is referring to - aka tls_cert_subject, tls_sni...etc