Test Webserver SSL Certificate

# SPDX-FileCopyrightText: 2010 Greenbone AG
# Some text descriptions might be excerpted from (a) referenced
# source(s), and are Copyright (C) by the respective right holder(s).
#
# SPDX-License-Identifier: GPL-2.0-only

if(description)
{
  script_oid("1.3.6.1.4.1.25623.1.0.96057");
  script_version("2026-06-11T07:15:11+0000");
  script_tag(name:"last_modification", value:"2026-06-11 07:15:11 +0000 (Thu, 11 Jun 2026)");
  script_tag(name:"creation_date", value:"2010-04-27 10:02:59 +0200 (Tue, 27 Apr 2010)");
  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:"remote_active");
  script_name("Test Webserver SSL Certificate");
  script_category(ACT_GATHER_INFO);
  script_copyright("Copyright (C) 2010 Greenbone AG");
  script_family("IT-Grundschutz");
  script_dependencies("compliance_tests.nasl");
  script_mandatory_keys("Compliance/Launch/GSHB");
  script_add_preference(name:"X.509 Root Authority Certificate(PEM)", type:"file", value:"", id:1);

  script_tag(name:"summary", value:"This plugin uses openssl to verify TLS/SSL Certificates.");

  exit(0);
}


if (get_kb_item("Ports/tcp/443")) port = 443;
else {
  set_kb_item(name: "GSHB/SSL-Cert", value: "none");
  exit(0);
}
RootPEM = script_get_preference_file_content("X.509 Root Authority Certificate(PEM)");

temp = get_tmp_dir();
ip = get_host_ip();

fwrite(file:temp + ip + "-GSHB_RootPEM.pem",data:RootPEM);

p = 0;
argv[p++] = "openssl";
argv[p++] = "verify";
argv[p++] = temp + ip + "-GSHB_RootPEM.pem";

RootPEMstate = pread(cmd: "openssl", argv: argv, cd: 5);

if (RootPEMstate =~ ".*-GSHB_RootPEM.pem: OK.*")
{
  i = 0;
  argv[i++] = "openssl";
  argv[i++] = "s_client";
  argv[i++] = "-CAfile";
  argv[i++] = temp + ip + "-GSHB_RootPEM.pem";
  argv[i++] = "-connect";
  argv[i++] = ip + ":" + port;

  sslcert = pread(cmd: "openssl", argv: argv, cd: 5);
  RootPEMstate = "OK";
}else{
  i = 0;
  argv[i++] = "openssl";
  argv[i++] = "s_client";
  argv[i++] = "-connect";
  argv[i++] = ip + ":" + port;

  sslcert = pread(cmd: "openssl", argv: argv, cd: 5);
  RootPEMstate = "FAIL";
}
if("unknown protocol" >!< sslcert){
  subject = egrep (string:sslcert, pattern:"subject=.*");
  rtcode = egrep (string:sslcert, pattern:"Verify return code:.*");
  certresult = subject + rtcode;
}else{
  certresult = "unknown";
  log_message(port:0, proto: "IT-Grundschutz", data:sslcert);
}
unlink(temp + ip + "-GSHB_RootPEM.pem");

set_kb_item(name: "GSHB/SSL-Cert", value: certresult);
set_kb_item(name: "GSHB/SSL-Cert/RootPEMstate", value: RootPEMstate);
exit(0);