本文主要是介绍解决Metasploit调用Nessus报错问题，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
问题描述
Error while running command nessus_scan_new: undefined method `[]’ for nil:NilClass
解决方法
发现报错，经过网上查询解决方法
在Nessus服务器执行，下面的版本号可能有所不同，根据自己的情况更改，需要管理员身份执行。
curl "https://raw.githubusercontent.com/QKaiser/nessus_rest-ruby/nessus-protected-api-support/lib/nessus_rest.rb" > /usr/share/metasploit-framework/vendor/bundle/ruby/版本号/gems/nessus_rest-0.1.6/lib/nessus_rest.rb
可能会遇到打不开的情况下，这个时候可以用一台能打开网址的电脑，将内容复制下来粘贴到一个文本文档中，然后将名称命名为nessus_rest.rbNessus服务器中的文件替换掉(建议将原文件改名，然后再将新建的文件放入目标文件夹中即可，以免有问题可以改回来)
https://raw.githubusercontent.com/QKaiser/nessus_rest-ruby/nessus-protected-api-support/lib/nessus_rest.rb
Ps：遇到打不开的童鞋，我把打开的内容贴在文章的最后方便大家直接复制。
然后退出msfconsole，在重新进入msfconsole，加载nessus
exit
msfconsole
load nessus
这个时候发现问题已经解决，能正常执行nessus_scan_new命令
nessus_rest.rb内容
#!/usr/bin/env ruby
# coding: utf-8
# = nessus_rest.rb: communicate with Nessus(6+) over JSON REST interface
#
# Author:: Vlatko Kosturjak
#
# (C) Vlatko Kosturjak, Kost. Distributed under MIT license.
#
# == What is this library?
#
# This library is used for communication with Nessus over JSON REST interface.
# You can start, stop, pause and resume scan. Watch progress and status of scan,
# download report, etc.
#
# == Requirements
#
# Required libraries are standard Ruby libraries: uri, net/https and json.
#
# == Usage:
#
# require 'nessus_rest'
#
# n=NessusREST::Client.new ({:url=>'https://localhost:8834', :username=>'user', :password=> 'password'})
# qs=n.scan_quick_template('basic','name-of-scan','localhost')
# scanid=qs['scan']['id']
# n.scan_wait4finish(scanid)
# n.report_download_file(scanid,'csv','myscanreport.csv')
#require 'openssl'
require 'uri'
require 'net/http'
require 'net/https'
require 'json'# NessusREST module - for all stuff regarding Nessus REST JSON
# module NessusREST# Client class implementation of Nessus (6+) JSON REST protocol. # Class which uses standard JSON lib to parse nessus JSON REST replies. # # == Typical Usage:## require 'nessus_rest'## n=NessusREST::Client.new ({:url=>'https://localhost:8834', :username=>'user', :password=> 'password'})# qs=n.scan_quick_template('basic','name-of-scan','localhost')# scanid=qs['scan']['id']# n.scan_wait4finish(scanid)# n.report_download_file(scanid,'csv','myscanreport.csv')#class Clientattr_accessor :quick_defaultsattr_accessor :defsleep, :httpsleep, :httpretry, :ssl_use, :ssl_verify, :autologinattr_reader :x_cookieclass << self@connection@tokenend# initialize quick scan defaults: these will be used when not specifying defaults## Usage: # # n.init_quick_defaults()def init_quick_defaults@quick_defaults=Hash.new@quick_defaults['enabled']=false@quick_defaults['launch']='ONETIME'@quick_defaults['launch_now']=true@quick_defaults['description']='Created with nessus_rest'end# initialize object: try to connect to Nessus Scanner using URL, user and password# (or any other defaults)## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')def initialize(params={})# defaults@nessusurl = params.fetch(:url,'https://127.0.0.1:8834/')@username = params.fetch(:username,'nessus')@password = params.fetch(:password,'nessus')@ssl_verify = params.fetch(:ssl_verify,false)@ssl_use = params.fetch(:ssl_use,true)@autologin = params.fetch(:autologin, true)@defsleep = params.fetch(:defsleep, 1)@httpretry = params.fetch(:httpretry, 3)@httpsleep = params.fetch(:httpsleep, 1)init_quick_defaults()uri = URI.parse(@nessusurl)@connection = Net::HTTP.new(uri.host, uri.port)@connection.use_ssl = @ssl_useif @ssl_verify@connection.verify_mode = OpenSSL::SSL::VERIFY_PEERelse@connection.verify_mode = OpenSSL::SSL::VERIFY_NONEendyield @connection if block_given?authenticate(@username, @password) if @autologinend# Tries to authenticate to the Nessus REST JSON interface## returns: true if logged in, false if not## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :autologin=>false)# if n.authenticate('user','pass')# puts "Logged in"# else# puts "Error"# enddef authenticate(username, password)@username = username@password = passwordauthdefaultendalias_method :login, :authenticate# Tries to authenticate to the Nessus REST JSON interface## returns: true if logged in, false if not## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :autologin=>false, # :username=>'nessususer', :password=>'nessuspassword')# if n.authdefault# puts "Logged in"# else# puts "Error"# enddef authdefaultpayload = {:username => @username,:password => @password,:json => 1,:authenticationmethod => true}res = http_post(:uri=>"/session", :data=>payload)if res['token']@token = "token=#{res['token']}"# Starting from Nessus 7.x, Tenable protects some endpoints with a custom header# so that they can only be called from the user interface (supposedly).res = http_get({:uri=>"/nessus6.js", :raw_content=> true})@api_token = res.scan(/([a-fA-F0-9]{8}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{4}-[a-fA-F0-9]{12})/).first.last@x_cookie = {'X-Cookie'=>@token, 'X-API-Token'=> @api_token}return trueelsefalseendend# checks if we're logged in correctly## returns: true if logged in, false if not## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# if n.authenticated# puts "Logged in"# else# puts "Error"# enddef authenticatedif (@token && @token.include?('token='))return trueelsereturn falseendend# try to get server properties## returns: JSON parsed object with server properties## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.get_server_propertiesdef get_server_propertieshttp_get(:uri=>"/server/properties", :fields=>x_cookie)endalias_method :server_properties, :get_server_properties# Add user to server## returns: JSON parsed object## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.user_add('user','password','16','local')## Reference:# https://localhost:8834/api#/resources/users/createdef user_add(username, password, permissions, type)payload = {:username => username, :password => password, :permissions => permissions, :type => type, :json => 1}http_post(:uri=>"/users", :fields=>x_cookie, :data=>payload)end# delete user with user_id## returns: result code## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# puts n.user_delete(1)def user_delete(user_id)res = http_delete(:uri=>"/users/#{user_id}", :fields=>x_cookie)return res.codeend# change password for user_id## returns: result code## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# puts n.user_chpasswd(1,'newPassword')def user_chpasswd(user_id, password)payload = {:password => password, :json => 1}res = http_put(:uri=>"/users/#{user_id}/chpasswd", :data=>payload, :fields=>x_cookie)return res.codeend# logout from the server## returns: result code## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# puts n.user_logoutdef user_logoutres = http_delete(:uri=>"/session", :fields=>x_cookie)return res.codeendalias_method :logout, :user_logout# Get List of Policies## returns: JSON parsed object with list of policies## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_policiesdef list_policieshttp_get(:uri=>"/policies", :fields=>x_cookie)end# Get List of Users## returns: JSON parsed object with list of users## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_usersdef list_usershttp_get(:uri=>"/users", :fields=>x_cookie)end# Get List of Folders## returns: JSON parsed object with list of folders## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_foldersdef list_foldershttp_get(:uri=>"/folders", :fields=>x_cookie)end# Get List of Scanners## returns: JSON parsed object with list of scanners## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_scannersdef list_scannershttp_get(:uri=>"/scanners", :fields=>x_cookie)end# Get List of Families## returns: JSON parsed object with list of families## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_familiesdef list_familieshttp_get(:uri=>"/plugins/families", :fields=>x_cookie)end# Get List of Plugins## returns: JSON parsed object with list of plugins## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_pluginsdef list_plugins(family_id)http_get(:uri=>"/plugins/families/#{family_id}", :fields=>x_cookie)end# Get List of Templates## returns: JSON parsed object with list of templates## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.list_templatesdef list_templates(type)res = http_get(:uri=>"/editor/#{type}/templates", :fields=>x_cookie)enddef plugin_details(plugin_id)http_get(:uri=>"/plugins/plugin/#{plugin_id}", :fields=>x_cookie)end# check if logged in user is administrator## returns: boolean value depending if user is administrator or not## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# if n.is_admin# puts "Administrator"# else# puts "NOT administrator"# enddef is_adminres = http_get(:uri=>"/session", :fields=>x_cookie)if res['permissions'] == 128return trueelsereturn falseendend# Get server status## returns: JSON parsed object with server status## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.server_statusdef server_statushttp_get(:uri=>"/server/status", :fields=>x_cookie)enddef scan_create(uuid, settings)payload = {:uuid => uuid, :settings => settings,:json => 1}.to_jsonhttp_post(:uri=>"/scans", :body=>payload, :fields=>x_cookie, :ctype=>'application/json')enddef scan_launch(scan_id)http_post(:uri=>"/scans/#{scan_id}/launch", :fields=>x_cookie)end# Get List of Scans## returns: JSON parsed object with list of scans## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.scan_listdef scan_listhttp_get(:uri=>"/scans", :fields=>x_cookie)endalias_method :list_scans, :scan_listdef scan_details(scan_id)http_get(:uri=>"/scans/#{scan_id}", :fields=>x_cookie)enddef scan_pause(scan_id)http_post(:uri=>"/scans/#{scan_id}/pause", :fields=>x_cookie)enddef scan_resume(scan_id)http_post(:uri=>"/scans/#{scan_id}/resume", :fields=>x_cookie)enddef scan_stop(scan_id)http_post(:uri=>"/scans/#{scan_id}/stop", :fields=>x_cookie)enddef scan_export(scan_id, format)payload = {:format => format}.to_jsonhttp_post(:uri=>"/scans/#{scan_id}/export", :body=>payload, :ctype=>'application/json', :fields=>x_cookie)enddef scan_export_status(scan_id, file_id)request = Net::HTTP::Get.new("/scans/#{scan_id}/export/#{file_id}/status")request.add_field("X-Cookie", @token)res = @connection.request(request)res = JSON.parse(res.body)return resend# delete scan with scan_id## returns: boolean (true if deleted)## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# puts n.scan_delete(1)def scan_delete(scan_id)res = http_delete(:uri=>"/scans/#{scan_id}", :fields=>x_cookie)if res.code == 200 thenreturn trueendreturn falseenddef policy_delete(policy_id)res = http_delete(:uri=>"/policies/#{policy_id}", :fields=>x_cookie)return res.codeend# Get template by type and uuid. Type can be 'policy' or 'scan'## returns: JSON parsed object with template## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.editor_templates('scan',uuid)def editor_templates (type, uuid)res = http_get(:uri=>"/editor/#{type}/templates/#{uuid}", :fields=>x_cookie)end# Performs scan with templatename provided (name, title or uuid of scan).# Name is your scan name and targets are targets for scan## returns: JSON parsed object with scan info## Usage:## require 'nessus_rest'## n=NessusREST::Client.new ({:url=>'https://localhost:8834', :username=>'user', :password=> 'password'})# qs=n.scan_quick_template('basic','name-of-scan','localhost')# scanid=qs['scan']['id']# n.scan_wait4finish(scanid)# n.report_download_file(scanid,'csv','myscanreport.csv')#def scan_quick_template (templatename, name, targets)templates=list_templates('scan')['templates'].select do |temp| temp['uuid'] == templatename or temp['name'] == templatename or temp['title'] == templatenameendif templates.nil? thenreturn nilendtuuid=templates.first['uuid']et=editor_templates('scan',tuuid)et.merge!(@quick_defaults)et['name']=nameet['text_targets']=targetssc=scan_create(tuuid,et)end# Performs scan with scan policy provided (uuid of policy or policy name).# Name is your scan name and targets are targets for scan## returns: JSON parsed object with scan info## Usage:## require 'nessus_rest'## n=NessusREST::Client.new ({:url=>'https://localhost:8834', :username=>'user', :password=> 'password'})# qs=n.scan_quick_policy('myscanpolicy','name-of-scan','localhost')# scanid=qs['scan']['id']# n.scan_wait4finish(scanid)# n.report_download_file(scanid,'nessus','myscanreport.nessus')#def scan_quick_policy (policyname, name, targets)policies=list_policies['policies'].select do |pol|pol['id'] == policyname or pol['name'] == policynameendif policies.nil? thenreturn nilendpolicy = policies.firsttuuid=policy['template_uuid']et=Hash.newet.merge!(@quick_defaults)et['name']=nameet['policy_id'] = policy['id']et['text_targets']=targetssc=scan_create(tuuid,et)enddef scan_status(scan_id)sd=scan_details(scan_id)if not sd['error'].nil?return 'error'endreturn sd['info']['status']enddef scan_finished?(scan_id)ss=scan_status(scan_id)if ss == 'completed' or ss == 'canceled' or ss == 'imported' thenreturn trueendreturn falseenddef scan_wait4finish(scan_id)while not scan_finished?(scan_id) do# puts scan_status(scan_id)sleep @defsleependend# Get host details from the scan## returns: JSON parsed object with host details## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.host_detail(123, 1234)def host_detail(scan_id, host_id)res = http_get(:uri=>"/scans/#{scan_id}/hosts/#{host_id}", :fields=>x_cookie)enddef report_download(scan_id, file_id)res = http_get(:uri=>"/scans/#{scan_id}/export/#{file_id}/download", :raw_content=> true, :fields=>x_cookie)enddef report_download_quick(scan_id, format) se=scan_export(scan_id,format)# ready, loadingwhile (status = scan_export_status(scan_id,se['file'])['status']) != "ready" do# puts statusif status.nil? or status == '' thenreturn nilendsleep @defsleependrf=report_download(scan_id,se['file'])return rfenddef report_download_file(scan_id, format, outputfn)report_content=report_download_quick(scan_id, format)File.open(outputfn, 'w') do |f| f.write(report_content)endend## private?## Perform HTTP put method with uri, data and fields## returns: HTTP result object## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# payload = {# :password => password, # :json => 1# }# res = n.http_put(:uri=>"/users/#{user_id}/chpasswd", :data=>payload, :fields=>n.x_cookie)# puts res.code def http_put(opts={})ret=http_put_low(opts)if ret.is_a?(Hash) and ret.has_key?('error') and ret['error']=='Invalid Credentials' thenauthdefaultret=http_put_low(opts)return retelsereturn retendenddef http_put_low(opts={})uri = opts[:uri]data = opts[:data]fields = opts[:fields] || {}res = niltries = @httpretryreq = Net::HTTP::Put.new(uri)req.set_form_data(data) unless (data.nil? || data.empty?)fields.each_pair do |name, value|req.add_field(name, value)endbegintries -= 1res = @connection.request(req)rescue Timeout::Error, Errno::EINVAL, Errno::ECONNRESET, EOFError, Net::HTTPBadResponse, Net::HTTPHeaderSyntaxError, Net::ProtocolError => eif tries>0sleep @httpsleepretryelsereturn resendrescue URI::InvalidURIErrorreturn resendresend# Perform HTTP delete method with uri, data and fields## returns: HTTP result object## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# res = n.http_delete(:uri=>"/session", :fields=>n.x_cookie)# puts res.codedef http_delete(opts={})ret=http_delete_low(opts)if ret.is_a?(Hash) and ret.has_key?('error') and ret['error']=='Invalid Credentials' thenauthdefaultret=http_delete_low(opts)return retelsereturn retendenddef http_delete_low(opts={})uri = opts[:uri]fields = opts[:fields] || {}res = niltries = @httpretryreq = Net::HTTP::Delete.new(uri)fields.each_pair do |name, value|req.add_field(name, value)endbegintries -= 1res = @connection.request(req)rescue Timeout::Error, Errno::EINVAL, Errno::ECONNRESET, EOFError, Net::HTTPBadResponse, Net::HTTPHeaderSyntaxError, Net::ProtocolError => eif tries>0sleep @httpsleepretryelsereturn resendrescue URI::InvalidURIErrorreturn resendresend# Perform HTTP get method with uri and fields## returns: JSON parsed object (if JSON parseable)## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.http_get(:uri=>"/users", :fields=>n.x_cookie)def http_get(opts={})raw_content = opts[:raw_content] || falseret=http_get_low(opts)if !raw_content thenif ret.is_a?(Hash) and ret.has_key?('error') and ret['error']=='Invalid Credentials' thenauthdefaultret=http_get_low(opts)return retelsereturn retendelsereturn retendenddef http_get_low(opts={})uri = opts[:uri]fields = opts[:fields] || {}raw_content = opts[:raw_content] || falsejson = {}tries = @httpretryreq = Net::HTTP::Get.new(uri)fields.each_pair do |name, value|req.add_field(name, value)endbegintries -= 1res = @connection.request(req)rescue Timeout::Error, Errno::EINVAL, Errno::ECONNRESET, EOFError, Net::HTTPBadResponse, Net::HTTPHeaderSyntaxError, Net::ProtocolError => eif tries>0sleep @httpsleepretryelsereturn jsonendrescue URI::InvalidURIErrorreturn jsonendif !raw_contentparse_json(res.body)elseres.bodyendend# Perform HTTP post method with uri, data, body and fields## returns: JSON parsed object (if JSON parseable)## Usage:## n=NessusREST::Client.new (:url=>'https://localhost:8834', :username=>'user', :password=> 'password')# pp n.http_post(:uri=>"/scans/#{scan_id}/launch", :fields=>n.x_cookie)def http_post(opts={})if opts.has_key?(:authenticationmethod) then# i know authzmethod = opts.delete(:authorizationmethod) is short, but not readableauthzmethod = opts[:authenticationmethod]opts.delete(:authenticationmethod)endret=http_post_low(opts)if ret.is_a?(Hash) and ret.has_key?('error') and ret['error']=='Invalid Credentials' thenif not authzmethodauthdefaultret=http_post_low(opts)return retendelsereturn retendenddef http_post_low(opts={})uri = opts[:uri]data = opts[:data]fields = opts[:fields] || {}body = opts[:body]ctype = opts[:ctype]json = {}tries = @httpretryreq = Net::HTTP::Post.new(uri)req.set_form_data(data) unless (data.nil? || data.empty?)req.body = body unless (body.nil? || body.empty?)req['Content-Type'] = ctype unless (ctype.nil? || ctype.empty?)fields.each_pair do |name, value|req.add_field(name, value)endbegintries -= 1res = @connection.request(req)rescue Timeout::Error, Errno::EINVAL, Errno::ECONNRESET, EOFError, Net::HTTPBadResponse, Net::HTTPHeaderSyntaxError, Net::ProtocolError => eif tries>0sleep @httpsleepretryelsereturn jsonendrescue URI::InvalidURIErrorreturn jsonendparse_json(res.body)end# Perform JSON parsing of body## returns: JSON parsed object (if JSON parseable)#def parse_json(body)buf = {}beginbuf = JSON.parse(body)rescue JSON::ParserErrorendbufendend # of Client class
end # of NessusREST module这篇关于解决Metasploit调用Nessus报错问题的文章就介绍到这儿，希望我们推荐的文章对编程师们有所帮助！
