PHP.CGI.Argument.Injection을 최소화하고 Centos 6.4 웹 서버를 더욱 강화합니다.

물리적 방화벽이 있는 Centos 6.4 서버가 있습니다. 방화벽에 의해 감지되는 PHP.CGI.Argument.Injection이 계속 많이 보입니다. 서버 자체에서는 아래와 같이 기본적인 Apache 강화 작업을 완료했습니다. 우리는 failure2ban과 mod_secure를 사용하고 있습니다. 서버를 더욱 강화하기 위해 또 무엇을 할 수 있습니까?

httpd.conf

   #
    # This is the main Apache server configuration file.  It contains the
    # configuration directives that give the server its instructions.
    # See <URL:http://httpd.apache.org/docs/2.2/> for detailed information.
    # In particular, see
    # <URL:http://httpd.apache.org/docs/2.2/mod/directives.html>
    # for a discussion of each configuration directive.
    #
    #
    # Do NOT simply read the instructions in here without understanding
    # what they do.  They're here only as hints or reminders.  If you are unsure
    # consult the online docs. You have been warned.  
    #
    # The configuration directives are grouped into three basic sections:
    #  1. Directives that control the operation of the Apache server process as a
    #     whole (the 'global environment').
    #  2. Directives that define the parameters of the 'main' or 'default' server,
    #     which responds to requests that aren't handled by a virtual host.
    #     These directives also provide default values for the settings
    #     of all virtual hosts.
    #  3. Settings for virtual hosts, which allow Web requests to be sent to
    #     different IP addresses or hostnames and have them handled by the
    #     same Apache server process.
    #
    # Configuration and logfile names: If the filenames you specify for many
    # of the server's control files begin with "/" (or "drive:/" for Win32), the
    # server will use that explicit path.  If the filenames do *not* begin
    # with "/", the value of ServerRoot is prepended -- so "logs/foo.log"
    # with ServerRoot set to "/etc/httpd" will be interpreted by the
    # server as "/etc/httpd/logs/foo.log".
    #

    ### Section 1: Global Environment
    #
    # The directives in this section affect the overall operation of Apache,
    # such as the number of concurrent requests it can handle or where it
    # can find its configuration files.
    #

    #
    # Don't give away too much information about all the subcomponents
    # we are running.  Comment out this line if you don't mind remote sites
    # finding out what major optional modules you are running
    ServerTokens OS

    #
    # ServerRoot: The top of the directory tree under which the server's
    # configuration, error, and log files are kept.
    #
    # NOTE!  If you intend to place this on an NFS (or otherwise network)
    # mounted filesystem then please read the LockFile documentation
    # (available at <URL:http://httpd.apache.org/docs/2.2/mod/mpm_common.html#lockfile>);
    # you will save yourself a lot of trouble.
    #
    # Do NOT add a slash at the end of the directory path.
    #
    ServerRoot "/etc/httpd"

    #
    # PidFile: The file in which the server should record its process
    # identification number when it starts.  Note the PIDFILE variable in
    # /etc/sysconfig/httpd must be set appropriately if this location is
    # changed.
    #
    PidFile run/httpd.pid

    #
    # Timeout: The number of seconds before receives and sends time out.
    #
    Timeout 60

    #
    # KeepAlive: Whether or not to allow persistent connections (more than
    # one request per connection). Set to "Off" to deactivate.
    #
    KeepAlive Off

    #
    # MaxKeepAliveRequests: The maximum number of requests to allow
    # during a persistent connection. Set to 0 to allow an unlimited amount.
    # We recommend you leave this number high, for maximum performance.
    #
    MaxKeepAliveRequests 100

    #
    # KeepAliveTimeout: Number of seconds to wait for the next request from the
    # same client on the same connection.
    #
    KeepAliveTimeout 15

    ##
    ## Server-Pool Size Regulation (MPM specific)
    ## 

    # prefork MPM
    # StartServers: number of server processes to start
    # MinSpareServers: minimum number of server processes which are kept spare
    # MaxSpareServers: maximum number of server processes which are kept spare
    # ServerLimit: maximum value for MaxClients for the lifetime of the server
    # MaxClients: maximum number of server processes allowed to start
    # MaxRequestsPerChild: maximum number of requests a server process serves
    <IfModule prefork.c>
    StartServers       8
    MinSpareServers    5
    MaxSpareServers   20
    ServerLimit      256
    MaxClients       256
    MaxRequestsPerChild  4000
    </IfModule>

    # worker MPM
    # StartServers: initial number of server processes to start
    # MaxClients: maximum number of simultaneous client connections
    # MinSpareThreads: minimum number of worker threads which are kept spare
    # MaxSpareThreads: maximum number of worker threads which are kept spare
    # ThreadsPerChild: constant number of worker threads in each server process
    # MaxRequestsPerChild: maximum number of requests a server process serves
    <IfModule worker.c>
    StartServers         4
    MaxClients         300
    MinSpareThreads     25
    MaxSpareThreads     75 
    ThreadsPerChild     25
    MaxRequestsPerChild  0
    </IfModule>

    #
    # Listen: Allows you to bind Apache to specific IP addresses and/or
    # ports, in addition to the default. See also the <VirtualHost>
    # directive.
    #
    # Change this to Listen on specific IP addresses as shown below to 
    # prevent Apache from glomming onto all bound IP addresses (0.0.0.0)
    #
    #Listen 12.34.56.78:80
    Listen 80

    #
    # Dynamic Shared Object (DSO) Support
    #
    # To be able to use the functionality of a module which was built as a DSO you
    # have to place corresponding `LoadModule' lines at this location so the
    # directives contained in it are actually available _before_ they are used.
    # Statically compiled modules (those listed by `httpd -l') do not need
    # to be loaded here.
    #
    # Example:
    # LoadModule foo_module modules/mod_foo.so
    #
    #LoadModule auth_basic_module modules/mod_auth_basic.so
    #LoadModule auth_digest_module modules/mod_auth_digest.so
    #LoadModule authn_file_module modules/mod_authn_file.so
    #LoadModule authn_alias_module modules/mod_authn_alias.so
    #LoadModule authn_anon_module modules/mod_authn_anon.so
    #LoadModule authn_dbm_module modules/mod_authn_dbm.so
    #LoadModule authn_default_module modules/mod_authn_default.so
    #LoadModule authz_host_module modules/mod_authz_host.so
    #LoadModule authz_user_module modules/mod_authz_user.so
    #LoadModule authz_owner_module modules/mod_authz_owner.so
    #LoadModule authz_groupfile_module modules/mod_authz_groupfile.so
    #LoadModule authz_dbm_module modules/mod_authz_dbm.so
    LoadModule authz_default_module modules/mod_authz_default.so
    LoadModule ldap_module modules/mod_ldap.so
    LoadModule authnz_ldap_module modules/mod_authnz_ldap.so
    LoadModule include_module modules/mod_include.so
    LoadModule log_config_module modules/mod_log_config.so
    LoadModule logio_module modules/mod_logio.so
    LoadModule env_module modules/mod_env.so
    LoadModule ext_filter_module modules/mod_ext_filter.so
    LoadModule mime_magic_module modules/mod_mime_magic.so
    LoadModule expires_module modules/mod_expires.so
    LoadModule deflate_module modules/mod_deflate.so
    LoadModule headers_module modules/mod_headers.so
    LoadModule usertrack_module modules/mod_usertrack.so
    LoadModule setenvif_module modules/mod_setenvif.so
    LoadModule mime_module modules/mod_mime.so
    #LoadModule dav_module modules/mod_dav.so
    LoadModule status_module modules/mod_status.so
    LoadModule autoindex_module modules/mod_autoindex.so
    LoadModule info_module modules/mod_info.so
    #LoadModule dav_fs_module modules/mod_dav_fs.so
    LoadModule vhost_alias_module modules/mod_vhost_alias.so
    #LoadModule negotiation_module modules/mod_negotiation.so
    LoadModule dir_module modules/mod_dir.so
    LoadModule actions_module modules/mod_actions.so
    #LoadModule speling_module modules/mod_speling.so
    LoadModule userdir_module modules/mod_userdir.so
    LoadModule alias_module modules/mod_alias.so
    #LoadModule substitute_module modules/mod_substitute.so
    LoadModule rewrite_module modules/mod_rewrite.so
    #LoadModule proxy_module modules/mod_proxy.so
    #LoadModule proxy_balancer_module modules/mod_proxy_balancer.so
    #LoadModule proxy_ftp_module modules/mod_proxy_ftp.so
    #LoadModule proxy_http_module modules/mod_proxy_http.so
    #LoadModule proxy_ajp_module modules/mod_proxy_ajp.so
    #LoadModule proxy_connect_module modules/mod_proxy_connect.so
    LoadModule cache_module modules/mod_cache.so
    LoadModule suexec_module modules/mod_suexec.so
    LoadModule disk_cache_module modules/mod_disk_cache.so
    LoadModule cgi_module modules/mod_cgi.so
    LoadModule version_module modules/mod_version.so

    #
    # The following modules are not loaded by default:
    #
    #LoadModule asis_module modules/mod_asis.so
    #LoadModule authn_dbd_module modules/mod_authn_dbd.so
    #LoadModule cern_meta_module modules/mod_cern_meta.so
    #LoadModule cgid_module modules/mod_cgid.so
    #LoadModule dbd_module modules/mod_dbd.so
    #LoadModule dumpio_module modules/mod_dumpio.so
    #LoadModule filter_module modules/mod_filter.so
    #LoadModule ident_module modules/mod_ident.so
    #LoadModule log_forensic_module modules/mod_log_forensic.so
    #LoadModule unique_id_module modules/mod_unique_id.so
    #

    #
    # Load config files from the config directory "/etc/httpd/conf.d".
    #
    Include conf.d/*.conf


    #
    #ExtendedStatus On

    #

    #
    User apache
    Group apache



    #
    ServerAdmin root@localhost       

    #
    # If your host doesn't have a registered DNS name, enter its IP address here.
    # You will have to access it by its address anyway, and this will make 
    # redirections work in a sensible way.

    #ServerName http://********:80


    # ServerName directive.
    #
    UseCanonicalName Off       

    #
    DocumentRoot "/var/www/html"

    # First, we configure the "default" to be a very restrictive set of 
    # features.  
    #
    <Directory />
        Options FollowSymLinks
        AllowOverride None
    </Directory>

    <Directory "/var/www/html">


    #
        Options -Indexes FollowSymLinks


    #
        AllowOverride None

    #
    # Controls who can get stuff from this server.
    #
        Order allow,deny
        Allow from all

    </Directory>        
    #
    # See also: http://httpd.apache.org/docs/misc/FAQ.html#forbidden
    #
    <IfModule mod_userdir.c>

        #
        UserDir disabled


        # 
        #UserDir public_html

    </IfModule>

    DirectoryIndex index.html index.html.var

    #
    # AccessFileName: The name of the file to look for in each directory
    # for additional configuration directives.  See also the AllowOverride
    # directive.
    #
    AccessFileName .htaccess

    #
    # The following lines prevent .htaccess and .htpasswd files from being 
    # viewed by Web clients. 
    #
    <Files ~ "^\.ht">
        Order allow,deny
        Deny from all
        Satisfy All
    </Files>

    #
    # TypesConfig describes where the mime.types file (or equivalent) is
    # to be found.
    #
    TypesConfig /etc/mime.types


    # a good value.  If most of your content is binary, such as applications
    # or images, you may want to use "application/octet-stream" instead to
    # keep browsers from trying to display binary files as though they are
    # text.
    #
    DefaultType text/plain


    # contents of the file itself to determine its type.  The MIMEMagicFile
    # directive tells the module where the hint definitions are located.
    #
    <IfModule mod_mime_magic.c>
    #   MIMEMagicFile /usr/share/magic.mime
        MIMEMagicFile conf/magic
    </IfModule>


    # nameserver.
    #
    HostnameLookups Off


    #
    #EnableMMAP off


    #
    #EnableSendfile off


    #
    ErrorLog logs/error_log


    LogLevel warn


    LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\"" combined
    LogFormat "%h %l %u %t \"%r\" %>s %b" common
    LogFormat "%{Referer}i -> %U" referer
    LogFormat "%{User-agent}i" agent

    # "combinedio" includes actual counts of actual bytes received (%I) and sent (%O); this
    # requires the mod_logio module to be loaded.
    #LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agent}i\" %I %O" combinedio


    #
    #CustomLog logs/access_log common

    #
    # If you would like to have separate agent and referer logfiles, uncomment
    # the following directives.
    #
    #CustomLog logs/referer_log referer
    #CustomLog logs/agent_log agent


    CustomLog logs/access_log combined

    # Set to "EMail" to also include a mailto: link to the ServerAdmin.
    # Set to one of:  On | Off | EMail
    #
    ServerSignature Off


    # We include the /icons/ alias for FancyIndexed directory listings.  If you
    # do not use FancyIndexing, you may comment this out.
    #
    Alias /icons/ "/var/www/icons/"

    <Directory "/var/www/icons">
        Options Indexes MultiViews FollowSymLinks
        AllowOverride None
        Order allow,deny
        Allow from all
    </Directory>

    #
    # WebDAV module configuration section.
    # 
    <IfModule mod_dav_fs.c>
        # Location of the WebDAV lock database.
        DAVLockDB /var/lib/dav/lockdb
    </IfModule>


    ScriptAlias /cgi-bin/ "/var/www/cgi-bin/"

    #
    # "/var/www/cgi-bin" should be changed to whatever your ScriptAliased
    # CGI directory exists, if you have that configured.
    #
    <Directory "/var/www/cgi-bin">
        AllowOverride None
        Options None
        Order allow,deny
        Allow from all
    </Directory>


    IndexOptions FancyIndexing VersionSort NameWidth=* HTMLTable Charset=UTF-8


    AddIconByEncoding (CMP,/icons/compressed.gif) x-compress x-gzip

    AddIconByType (TXT,/icons/text.gif) text/*
    AddIconByType (IMG,/icons/image2.gif) image/*
    AddIconByType (SND,/icons/sound2.gif) audio/*
    AddIconByType (VID,/icons/movie.gif) video/*

    AddIcon /icons/binary.gif .bin .exe
    AddIcon /icons/binhex.gif .hqx
    AddIcon /icons/tar.gif .tar
    AddIcon /icons/world2.gif .wrl .wrl.gz .vrml .vrm .iv
    AddIcon /icons/compressed.gif .Z .z .tgz .gz .zip
    AddIcon /icons/a.gif .ps .ai .eps
    AddIcon /icons/layout.gif .html .shtml .htm .pdf
    AddIcon /icons/text.gif .txt
    AddIcon /icons/c.gif .c
    AddIcon /icons/p.gif .pl .py
    AddIcon /icons/f.gif .for
    AddIcon /icons/dvi.gif .dvi
    AddIcon /icons/uuencoded.gif .uu
    AddIcon /icons/script.gif .conf .sh .shar .csh .ksh .tcl
    AddIcon /icons/tex.gif .tex
    AddIcon /icons/bomb.gif core

    AddIcon /icons/back.gif ..
    AddIcon /icons/hand.right.gif README
    AddIcon /icons/folder.gif ^^DIRECTORY^^
    AddIcon /icons/blank.gif ^^BLANKICON^^

    #
    # DefaultIcon is which icon to show for files which do not have an icon
    # explicitly set.
    #
    DefaultIcon /icons/unknown.gif


    # HeaderName is the name of a file which should be prepended to
    # directory indexes. 
    ReadmeName README.html
    HeaderName HEADER.html

    #
    # IndexIgnore is a set of filenames which directory indexing should ignore
    # and not include in the listing.  Shell-style wildcarding is permitted.
    #
    IndexIgnore .??* *~ *# HEADER* README* RCS CVS *,v *,t


    # * being a certain language than marking it with the wrong
    # * language!
    #
    DefaultLanguage english

    # Simplified Chinese (zh-CN) - Spanish (es) - Traditional Chinese (zh-TW)
    #
    AddLanguage ca .ca
    AddLanguage cs .cz .cs
    AddLanguage da .dk
    AddLanguage de .de
    AddLanguage el .el
    AddLanguage en .en
    AddLanguage eo .eo
    AddLanguage es .es
    AddLanguage et .et
    AddLanguage fr .fr
    AddLanguage he .he
    AddLanguage hr .hr
    AddLanguage it .it
    AddLanguage ja .ja
    AddLanguage ko .ko
    AddLanguage ltz .ltz
    AddLanguage nl .nl
    AddLanguage nn .nn
    AddLanguage no .no
    AddLanguage pl .po
    AddLanguage pt .pt
    AddLanguage pt-BR .pt-br
    AddLanguage ru .ru
    AddLanguage sv .sv
    AddLanguage zh-CN .zh-cn
    AddLanguage zh-TW .zh-tw


    LanguagePriority en ca cs da de el eo es et fr he hr it ja ko ltz nl nn no pl pt pt-BR ru sv zh-CN zh-TW

    ForceLanguagePriority Prefer Fallback

    AddDefaultCharset UTF-8

    #
    # AddType allows you to add to or override the MIME configuration
    # file mime.types for specific file types.
    #
    #AddType application/x-tar .tgz

    #
    # AddEncoding allows you to have certain browsers uncompress
    # information on the fly. Note: Not all browsers support this.
    #AddEncoding x-compress .Z
    #AddEncoding x-gzip .gz .tgz

    # If the AddEncoding directives above are commented-out, then you
    # probably should define those extensions to indicate media types:
    #
    AddType application/x-compress .Z
    AddType application/x-gzip .gz .tgz

    #
    #   MIME-types for downloading Certificates and CRLs
    #
    AddType application/x-x509-ca-cert .crt
    AddType application/x-pkcs7-crl    .crl

    #
    # AddHandler allows you to map certain file extensions to "handlers":
    # actions unrelated to filetype. These can be either built into the server
    # or added with the Action directive (see below)
    #
    # To use CGI scripts outside of ScriptAliased directories:
    # (You will also need to add "ExecCGI" to the "Options" directive.)
    #
    #AddHandler cgi-script .cgi

    #
    # For files that include their own HTTP headers:
    #
    #AddHandler send-as-is asis

    #
    # For type maps (negotiated resources):
    # (This is enabled by default to allow the Apache "It Worked" page
    #  to be distributed in multiple languages.)
    #
    AddHandler type-map var

    #
    # Filters allow you to process content before it is sent to the client.
    #
    # To parse .shtml files for server-side includes (SSI):
    # (You will also need to add "Includes" to the "Options" directive.)
    #
    AddType text/html .shtml
    AddOutputFilter INCLUDES .shtml

    # Action lets you define media types that will execute a script whenever
    # Format: Action media/type /cgi-script/location
    # Format: Action handler-name /cgi-script/location
    #


    # Some examples:
    #ErrorDocument 500 "The server made a boo boo."
    #ErrorDocument 404 /missing.html
    #ErrorDocument 404 "/cgi-bin/missing_handler.pl"
    #ErrorDocument 402 http://www.example.com/subscription_info.html
    #

    #
    # Putting this all together, we can internationalize error responses.
    #
    # We use Alias to redirect any /error/HTTP_<error>.html.var response to
    # our collection of by-error message multi-language collections.  We use 
    # includes to substitute the appropriate text.
    #
    # You can modify the messages' appearance without changing any of the
    # default HTTP_<error>.html.var files by adding the line:
    #
    #   Alias /error/include/ "/your/include/path/"
    #
    # which allows you to create your own set of files by starting with the
    # /var/www/error/include/ files and
    # copying them to /your/include/path/, even on a per-VirtualHost basis.
    #

    Alias /error/ "/var/www/error/"

    <IfModule mod_negotiation.c>
    <IfModule mod_include.c>
        <Directory "/var/www/error">
            AllowOverride None
            Options IncludesNoExec
            AddOutputFilter Includes html
            AddHandler type-map var
            Order allow,deny
            Allow from all
            LanguagePriority en es de fr
            ForceLanguagePriority Prefer Fallback
        </Directory>

    #    ErrorDocument 400 /error/HTTP_BAD_REQUEST.html.var
    #    ErrorDocument 401 /error/HTTP_UNAUTHORIZED.html.var
    #    ErrorDocument 403 /error/HTTP_FORBIDDEN.html.var
    #    ErrorDocument 404 /error/HTTP_NOT_FOUND.html.var
    #    ErrorDocument 405 /error/HTTP_METHOD_NOT_ALLOWED.html.var
    #    ErrorDocument 408 /error/HTTP_REQUEST_TIME_OUT.html.var
    #    ErrorDocument 410 /error/HTTP_GONE.html.var
    #    ErrorDocument 411 /error/HTTP_LENGTH_REQUIRED.html.var
    #    ErrorDocument 412 /error/HTTP_PRECONDITION_FAILED.html.var
    #    ErrorDocument 413 /error/HTTP_REQUEST_ENTITY_TOO_LARGE.html.var
    #    ErrorDocument 414 /error/HTTP_REQUEST_URI_TOO_LARGE.html.var
    #    ErrorDocument 415 /error/HTTP_UNSUPPORTED_MEDIA_TYPE.html.var
    #    ErrorDocument 500 /error/HTTP_INTERNAL_SERVER_ERROR.html.var
    #    ErrorDocument 501 /error/HTTP_NOT_IMPLEMENTED.html.var
    #    ErrorDocument 502 /error/HTTP_BAD_GATEWAY.html.var
    #    ErrorDocument 503 /error/HTTP_SERVICE_UNAVAILABLE.html.var
    #    ErrorDocument 506 /error/HTTP_VARIANT_ALSO_VARIES.html.var

    </IfModule>
    </IfModule>

    #
    # The following directives modify normal HTTP response behavior to
    # handle known problems with browser implementations.
    #
    BrowserMatch "Mozilla/2" nokeepalive
    BrowserMatch "MSIE 4\.0b2;" nokeepalive downgrade-1.0 force-response-1.0
    BrowserMatch "RealPlayer 4\.0" force-response-1.0
    BrowserMatch "Java/1\.0" force-response-1.0
    BrowserMatch "JDK/1\.0" force-response-1.0

    #
    # The following directive disables redirects on non-GET requests for
    # a directory that does not include the trailing slash.  This fixes a 
    # problem with Microsoft WebFolders which does not appropriately handle 
    # redirects for folders with DAV methods.
    # Same deal with Apple's DAV filesystem and Gnome VFS support for DAV.
    #
    BrowserMatch "Microsoft Data Access Internet Publishing Provider" redirect-carefully
    BrowserMatch "MS FrontPage" redirect-carefully
    BrowserMatch "^WebDrive" redirect-carefully
    BrowserMatch "^WebDAVFS/1.[0123]" redirect-carefully
    BrowserMatch "^gnome-vfs/1.0" redirect-carefully
    BrowserMatch "^XML Spy" redirect-carefully
    BrowserMatch "^Dreamweaver-WebDAV-SCM1" redirect-carefully