Knot Resolver Detection (Linux/Unix SSH Login)

# Copyright (C) 2019 Greenbone Networks GmbH
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# 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
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.113448");
  script_version("2021-06-15T12:39:35+0000");
  script_tag(name:"last_modification", value:"2021-06-15 12:39:35 +0000 (Tue, 15 Jun 2021)");
  script_tag(name:"creation_date", value:"2019-07-22 15:22:00 +0200 (Mon, 22 Jul 2019)");
  script_tag(name:"cvss_base", value:"0.0");
  script_tag(name:"cvss_base_vector", value:"AV:N/AC:L/Au:N/C:N/I:N/A:N");

  script_tag(name:"qod_type", value:"executable_version");

  script_name("Knot Resolver Detection (Linux/Unix SSH Login)");

  script_category(ACT_GATHER_INFO);

  script_copyright("Copyright (C) 2019 Greenbone Networks GmbH");
  script_family("Product detection");
  script_dependencies("gather-package-list.nasl");
  script_mandatory_keys("login/SSH/success");
  script_exclude_keys("ssh/no_linux_shell");

  script_tag(name:"summary", value:"SSH login-based detection of Knot Resolver.");

  script_xref(name:"URL", value:"https://www.knot-resolver.cz/");

  exit(0);
}

CPE = "cpe:/a:nic:knot_resolver:";

include( "ssh_func.inc" );
include( "cpe.inc" );
include( "host_details.inc" );

sock = ssh_login_or_reuse_connection();
if( ! sock )
  exit( 0 );

#nb: [k]not [res]olver [d]aemon
files = ssh_find_file( file_name: "/kresd$", useregex: TRUE, sock: sock );

foreach executableFile( files ) {
  if( ! executableFile = chomp( executableFile ) )
    continue;

  ver = ssh_get_bin_version( full_prog_name: executableFile, version_argv: "--version", ver_pattern: "Knot Resolver, version ([0-9.]+)", sock: sock );
  if( ver[1] ) {

    version = ver[1];
    set_kb_item( name: "knot/resolver/detected", value: TRUE );

    register_and_report_cpe( app: "Knot Resolver",
                             ver: version,
                             concluded: ver[0],
                             base: CPE,
                             expr: "([0-9.]+)",
                             insloc: executableFile,
                             regPort: 0,
                             regService: "ssh-login" );

  }
}

ssh_close_connection();
exit( 0 );