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CGI script only works if named index.pl

by almsdealer (Acolyte)
on May 27, 2022 at 18:19 UTC ( #11144236=perlquestion: print w/replies, xml ) Need Help??

almsdealer has asked for the wisdom of the Perl Monks concerning the following question:

If I hit 127.0.0.1/cgi-bin/index.pl I see the output in browser.

If I hit If I hit 127.0.0.1/cgi-bin/about.pl I get an error in the apache log:

stderr from /var/www/cgi-bin/about.pl: AH01241: error spawning CGI child: exec of '/var/www/cgi-bin/about.pl' failed (Permission denied)

Both the index.pl and about.pl have exactly the same content (for debugging reasons)

Both the index.pl and about.pl have exactly the same owner and file permissions (chmod +a)

I can execute the about.pl file manually like ./about.pl and see the correct output

My apache config looks like this:

# # This is the main Apache HTTP server configuration file. It contains + the # configuration directives that give the server its instructions. # See <URL:http://httpd.apache.org/docs/2.4/> for detailed information +. # In particular, see # <URL:http://httpd.apache.org/docs/2.4/mod/directives.html> # for a discussion of each configuration directive. # # See the httpd.conf(5) man page for more information on this configur +ation, # and httpd.service(8) on using and configuring the httpd service. # # 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. # # Configuration and logfile names: If the filenames you specify for ma +ny # 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 'log/access_log +' # with ServerRoot set to '/www' will be interpreted by the # server as '/www/log/access_log', where as '/log/access_log' will be # interpreted as '/log/access_log'. # # ServerRoot: The top of the directory tree under which the server's # configuration, error, and log files are kept. # # Do not add a slash at the end of the directory path. If you point # ServerRoot at a non-local disk, be sure to specify a local disk on t +he # Mutex directive, if file-based mutexes are used. If you wish to sha +re the # same ServerRoot for multiple httpd daemons, you will need to change +at # least PidFile. # ServerRoot "/etc/httpd" # # Listen: Allows you to bind Apache to specific IP addresses and/or # ports, instead of the default. See also the <VirtualHost> # directive. # # Change this to Listen on a specific IP address, but note that if # httpd.service is enabled to run at boot time, the address may not be # available when the service starts. See the httpd.service(8) man # page for more information. # #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 t +he # 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 # Include conf.modules.d/*.conf # # If you wish httpd to run as a different user or group, you must run # httpd as root initially and it will switch. # # User/Group: The name (or #number) of the user/group to run httpd as. # It is usually good practice to create a dedicated user and group for # running httpd, as with most system services. # User apache Group apache # 'Main' server configuration # # The directives in this section set up the values used by the 'main' # server, which responds to any requests that aren't handled by a # <VirtualHost> definition. These values also provide defaults for # any <VirtualHost> containers you may define later in the file. # # All of these directives may appear inside <VirtualHost> containers, # in which case these default settings will be overridden for the # virtual host being defined. # # # ServerAdmin: Your address, where problems with the server should be # e-mailed. This address appears on some server-generated pages, such # as error documents. e.g. admin@your-domain.com # ServerAdmin root@localhost # # ServerName gives the name and port that the server uses to identify +itself. # This can often be determined automatically, but we recommend you spe +cify # it explicitly to prevent problems during startup. # # If your host doesn't have a registered DNS name, enter its IP addres +s here. # #ServerName www.example.com:80 # # Deny access to the entirety of your server's filesystem. You must # explicitly permit access to web content directories in other # <Directory> blocks below. # <Directory /> AllowOverride none Require all denied </Directory> # # Note that from this point forward you must specifically allow # particular features to be enabled - so if something's not working as # you might expect, make sure that you have specifically enabled it # below. # # # DocumentRoot: The directory out of which you will serve your # documents. By default, all requests are taken from this directory, b +ut # symbolic links and aliases may be used to point to other locations. # DocumentRoot "/var/www/html" # # Relax access to content within /var/www. # <Directory "/var/www"> AllowOverride None # Allow open access: Require all granted </Directory> # Further relax access to the default document root: <Directory "/var/www/html"> # # Possible values for the Options directive are "None", "All", # or any combination of: # Indexes Includes FollowSymLinks SymLinksifOwnerMatch ExecCGI M +ultiViews # # Note that "MultiViews" must be named *explicitly* --- "Options A +ll" # doesn't give it to you. # # The Options directive is both complicated and important. Please + see # http://httpd.apache.org/docs/2.4/mod/core.html#options # for more information. # Options Indexes FollowSymLinks # # AllowOverride controls what directives may be placed in .htacces +s files. # It can be "All", "None", or any combination of the keywords: # Options FileInfo AuthConfig Limit # AllowOverride None # # Controls who can get stuff from this server. # Require all granted </Directory> # # DirectoryIndex: sets the file that Apache will serve if a directory # is requested. # <IfModule dir_module> DirectoryIndex index.html </IfModule> # # The following lines prevent .htaccess and .htpasswd files from being + # viewed by Web clients. # <Files ".ht*"> Require all denied </Files> # # ErrorLog: The location of the error log file. # If you do not specify an ErrorLog directive within a <VirtualHost> # container, error messages relating to that virtual host will be # logged here. If you *do* define an error logfile for a <VirtualHost +> # container, that host's errors will be logged there and not here. # ErrorLog "logs/error_log" # # LogLevel: Control the number of messages logged to the error_log. # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. # LogLevel warn <IfModule log_config_module> # # The following directives define some format nicknames for use wi +th # a CustomLog directive (see below). # LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Agen +t}i\"" combined LogFormat "%h %l %u %t \"%r\" %>s %b" common <IfModule logio_module> # You need to enable mod_logio.c to use %I and %O LogFormat "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-Ag +ent}i\" %I %O" combinedio </IfModule> # # The location and format of the access logfile (Common Logfile Fo +rmat). # If you do not define any access logfiles within a <VirtualHost> # container, they will be logged here. Contrariwise, if you *do* # define per-<VirtualHost> access logfiles, transactions will be # logged therein and *not* in this file. # #CustomLog "logs/access_log" common # # If you prefer a logfile with access, agent, and referer informat +ion # (Combined Logfile Format) you can use the following directive. # CustomLog "logs/access_log" combined </IfModule> <IfModule alias_module> # # Redirect: Allows you to tell clients about documents that used t +o # exist in your server's namespace, but do not anymore. The client + # will make a new request for the document at its new location. # Example: # Redirect permanent /foo http://www.example.com/bar # # Alias: Maps web paths into filesystem paths and is used to # access content that does not live under the DocumentRoot. # Example: # Alias /webpath /full/filesystem/path # # If you include a trailing / on /webpath then the server will # require it to be present in the URL. You will also likely # need to provide a <Directory> section to allow access to # the filesystem path. # # ScriptAlias: This controls which directories contain server scri +pts. # ScriptAliases are essentially the same as Aliases, except that # documents in the target directory are treated as applications an +d # run by the server when requested rather than as documents sent t +o the # client. The same rules about trailing "/" apply to ScriptAlias # directives as to Alias. # ScriptAlias "/cgi-bin/" "/var/www/cgi-bin/" </IfModule> # # "/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 Require all granted </Directory> <IfModule mime_module> # # TypesConfig points to the file containing the list of mappings f +rom # filename extension to MIME-type. # TypesConfig /etc/mime.types # # AddType allows you to add to or override the MIME configuration # file specified in TypesConfig for specific file types. # #AddType application/x-gzip .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 # # AddHandler allows you to map certain file extensions to "handler +s": # actions unrelated to filetype. These can be either built into th +e 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 type maps (negotiated resources): #AddHandler type-map var # # Filters allow you to process content before it is sent to the cl +ient. # # 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 </IfModule> # # Specify a default charset for all content served; this enables # interpretation of all content as UTF-8 by default. To use the # default browser choice (ISO-8859-1), or to allow the META tags # in HTML content to override this choice, comment out this # directive: # AddDefaultCharset UTF-8 <IfModule mime_magic_module> # # The mod_mime_magic module allows the server to use various hints + from the # contents of the file itself to determine its type. The MIMEMagi +cFile # directive tells the module where the hint definitions are locate +d. # MIMEMagicFile conf/magic </IfModule> #<Directory "/var/www/html"> # FallbackResource "index.pl" #</Directory> # # Customizable error responses come in three flavors: # 1) plain text 2) local redirects 3) external redirects # # 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 # # # EnableMMAP and EnableSendfile: On systems that support it, # memory-mapping or the sendfile syscall may be used to deliver # files. This usually improves server performance, but must # be turned off when serving from networked-mounted # filesystems or if support for these functions is otherwise # broken on your system. # Defaults if commented: EnableMMAP On, EnableSendfile Off # #EnableMMAP off EnableSendfile on # Supplemental configuration # # Load config files in the "/etc/httpd/conf.d" directory, if any. IncludeOptional conf.d/*.conf

Does anyone know what I might be doing wrong?

Replies are listed 'Best First'.
Re: CGI script only works if named index.pl
by hippo (Bishop) on May 27, 2022 at 22:07 UTC
    Both the index.pl and about.pl have exactly the same owner and file permissions

    Do they have exactly the same SELinux contexts?


    🦛

      Ok, I read up on selinux and file contexts, and I think the about.pl file had the wrong context due to me originally creating it in another folder and copying it into cgi-bin. Thank you, I was absolutely stumped!

      total 8 -rwxr-xr-x. 1 root root unconfined_u:object_r:httpd_sys_content_t:s0 + 143 May 27 15:49 about.pl -rwxr-xr-x. 1 root root unconfined_u:object_r:httpd_sys_script_exec_t: +s0 167 May 27 09:12 index.pl

      It doesn't look like it!

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