[Bug 1888926] Re: tls.tlscfgcmd not recognized; rebuild rsyslog against librelp 1.5.0

[Mauricio Faria de Oliveira]

** Tags added: sts-sponsor-mfo

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Title:
  tls.tlscfgcmd not recognized; rebuild rsyslog against librelp 1.5.0

Status in rsyslog package in Ubuntu:
  Fix Released
Status in rsyslog source package in Focal:
  In Progress
Status in rsyslog source package in Groovy:
  Fix Released

Bug description:
  [Description]

  Problem is according to https://launchpad.net/ubuntu/+source/librelp/+publishinghistory,
  librelp-dev 1.5.0 was published into focal at 2020-04-21, but reverse dependencies
  (such as rsyslog) weren't rebuilt after this new version was published

  # dpkg -l | grep librelp
  ii librelp-dev:amd64 1.5.0-1ubuntu2 amd64 Reliable Event Logging Protocol (RELP) library - development files
  ii librelp0:amd64 1.5.0-1ubuntu2 amd64 Reliable Event Logging Protocol (RELP) library

  rsyslogd: error during parsing file /etc/rsyslog.d/FILENAME.conf, on
  or before line 22: imrelp: librelp does not support input parameter
  'tls.tlscfgcmd'; it probably is too old (1.5.0 or higher should be
  fine); ignoring setting now. [v8.2001.0 try
  https://www.rsyslog.com/e/2207 ]

  [Reproducer]

  Setup a focal machine with rsyslog, using the following configuration:

  ----
  module(load="imrelp" tls.tlslib="openssl")

  input(
      type="imrelp" port="2515"
      tls="on"
      # This should work in rsyslog 8.2006.0:
      #tls.mycert="/etc/rsyslog.tls/fullchain.pem"
      # for now we use the work-around discussed in:
      # https://github.com/rsyslog/rsyslog/issues/4360
      tls.cacert="/etc/rsyslog.tls/chain.pem"
      tls.mycert="/etc/rsyslog.tls/cert.pem"
      tls.myprivkey="/etc/rsyslog.tls/privkey.pem"
      tls.tlscfgcmd="ServerPreference CipherString=ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384 Ciphersuites=TLS_AES_128_GCM_SHA256:TLS_CHACHA20_POLY1305_SHA256:TLS_AES_256_GCM_SHA384 MinProtocol=TLSv1.2"
  )
  ----

  This error comes from this code in plugins/imrelp/imrelp.c:

  ----
  #if defined(HAVE_RELPENGINESETTLSCFGCMD)
                          inst->tlscfgcmd = (uchar*)es_str2cstr(pvals[i].val.d.estr, NULL);
  #else
                          parser_errmsg("imrelp: librelp does not support input parameter 'tls.tlscfgcmd'; "
                                  "it probably is too old (1.5.0 or higher should be fine); ignoring setting now.");
  #endif
  ----

  The build log for focal:
  https://launchpadlibrarian.net/464665610/buildlog_ubuntu-focal-arm64.rsyslog_8.2001.0-1ubuntu1_BUILDING.txt.gz
  says:
  checking for relpSrvSetTlsConfigCmd... no
  checking for relpSrvSetTlsConfigCmd... (cached) no

  The build log for groovy:
  https://launchpadlibrarian.net/486409321/buildlog_ubuntu-groovy-arm64.rsyslog_8.2006.0-2ubuntu1_BUILDING.txt.gz
  says:
  checking for relpSrvSetTlsConfigCmd... yes
  checking for relpSrvSetTlsConfigCmd... (cached) yes

  If I rebuild the rsyslog package, I get:
  checking for relpSrvSetTlsConfigCmd... yes
  checking for relpSrvSetTlsConfigCmd... (cached) yes

  I suspect that the rsyslog package was built against and older librelp
  version. A simple rebuild of rsyslog should fix this, though a more
  complete fix would be to raise the Build-Depends from librelp-dev (>=
  1.4.0) to librelp-dev (>= 1.5.0).

  [Risk potential]

  * No identified as this is a rebuild that should have been done on all 
  reverse dependencies of librelp-dev when upgraded from 1.4.0 to 1.5.0

  
  [Fix]

  Provide a rebuild SRU for focal.

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