cgi脚本无法在apache下写入世界可写文件

Question

I'm attempting to create a simple CGI script using CentOS 7, Apache 2.4 and Ruby 2.0. All tools installed from official packages.

My script, which resides at /var/www/cgi-bin/test.cgi is:

#!/usr/bin/ruby

puts "Content-Type: text/plain\n\n"
begin
    file = File.open("test.log", "a")
    file.puts("foobar")
    file.close
rescue Exception
    puts "pwd: #{`pwd`}"
    puts $!.inspect
end

When I load http://myhost/cgi-bin/test.cgi , I get the following:

pwd: /var/www/cgi-bin
#<Errno::EACCES: Permission denied - test.log>

However:

[root@host cgi-bin]# ls -l /var/www/cgi-bin
total 8
-rwxr-xr-x. 1 root root 153 Jul 10 22:03 env.cgi
-rwxr-xr-x. 1 root root 359 Jul 11 00:45 test.cgi
-rw-rw-rw-. 1 root root   0 Jul 11 00:42 test.log

How (and where) can I write data from inside this cgi script if not to a world-writable file in the script's own working directory?

Answer 1

SELinux was blocking the file writes. "setenforce Permissive" allowed them to go through. Edited /etc/sysconfig/selinux and rebooted to make permanent.