Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

CGI script only works if named index.pl

by almsdealer (Acolyte)
on May 27, 2022 at 18:19 UTC ( [id://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!

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: perlquestion [id://11144236]
Approved by Athanasius
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others about the Monastery: (4)
As of 2024-04-19 19:18 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found