On Thursday 22 May 2014 22:14:23 Lyle wrote:
> On 22/05/2014 19:32, Valentin V. Bartenev wrote:
> > On Thursday 22 May 2014 16:26:54 Phil Knight wrote:
> >> Hi
> >>
> >> We are having an issue passing data to CGI scripts via PATH_INFO
> >> environment variable.
> >>
> >> for example:-
> >>
> >> http://domain.com/cgi-bin/script.cgi/=
> >>
> >> On various apache servers this works fine and the PATH_INFO variable
> >> will contain "/=", on our nginx server we are getting a 403 forbidden
> >> error. We are using fcgiwrap [1] for running CGI and .cgi scripts are
> >> executing.
> >>
> >> Could this be an issue with nginx configuration?
> > [..]
> >
> > Most likely this is an issue with the configuration.
>
> I think the relevant part is here:
>
> location /cgi-bin/ {
> root /users/folder;
> gzip off;
> fastcgi_pass unix:/var/run/fcgiwrap.socket;
> fastcgi_param QUERY_STRING $query_string;
> fastcgi_param REQUEST_METHOD $request_method;
> fastcgi_param CONTENT_TYPE $content_type;
> fastcgi_param CONTENT_LENGTH $content_length;
> fastcgi_param SCRIPT_NAME $fastcgi_script_name;
> fastcgi_param PATH_INFO $fastcgi_path_info;
> fastcgi_param REQUEST_URI $request_uri;
> fastcgi_param DOCUMENT_URI $document_uri;
> fastcgi_param SERVER_PROTOCOL $server_protocol;
> fastcgi_param GATEWAY_INTERFACE CGI/1.1;
> fastcgi_param SERVER_SOFTWARE nginx/$nginx_version;
> fastcgi_param REMOTE_ADDR $remote_addr;
> fastcgi_param REMOTE_PORT $remote_port;
> fastcgi_param SERVER_ADDR $server_addr;
> fastcgi_param SERVER_PORT $server_port;
> fastcgi_param SERVER_NAME $server_name;
>
> fastcgi_param DOCUMENT_ROOT /users/folder/cgi-bin/;
> fastcgi_param SCRIPT_FILENAME
> $document_root$fastcgi_script_name;
> fastcgi_connect_timeout 120;
> fastcgi_send_timeout 120;
> fastcgi_read_timeout 120;
> }
>
> I could be wrong. Any pointers would be very much appreciated.
>
> I've noticed that:
>
> http://domain.com/cgi-bin/no_existent_script.cgi
>
> Also gives a 403. So I suspect that nginx is looking for a file called =
> in a folder named api.cgi/
> I'm not sure what configuration we need to do to fix this.
[..]

As I already said, nginx knows nothing about CGI. It doesn't look for any
files in your location with "fastcgi_pass". It just passes request and
all the FastCGI params that you have configured with the values that you
have set.

For example, since you have:

fastcgi_param PATH_INFO $fastcgi_path_info;

and missing the fastcgi_split_path_info directive, then probably nginx pases
empty string in PATH_INFO.

Please, check the docs to figure out how exactly the $fastcgi_path_info
variable works and what values it takes:
http://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#var_fastcgi_path_info

The whole list of variables with links to descriptions can be found here:
http://nginx.org/en/docs/varindex.html

Then, probably, you need to check fcgiwrap documentation to figure out what
variables it expects and how they are processed.

wbr, Valentin V. Bartenev

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