function.fopen: failed to open stream: Permission denied in PHP

问题

I'm trying to create XML sitemaps for my website from my PHP application. The idea is to either create a new file or overwrite an existing file. When I call fopen, I get the following error:

[function.fopen]: failed to open stream: Permission denied

I'm trying to write to the webroot and its permissions are: 755. This means that the owner has write permission, right? What do I need to do to make my script be able to write to this folder? 777 would be a bad thing, right? Can I run my script as owner somehow?

Thanks.

回答1:

Yep, as you've said, using 777 could be huge mistake. The webserver doesn't run with the same user as you use to create files and folders.

You have some options:

• Run the sitemap creation as a cronjob, using an user with rights to write there, other than the apache user.
• Put the sitemap in another directory, and the set up a 302 Redirect or a symlink. In this case, if you have a security issue that let's someone to write your sitemap.xml, at least they'll not be able to create another file with a more dangerous extensions (like PHP, which may result in a site intrusion).
• Make a rewrite rule to redirect any hit to sitemap.xml, to a php script that outputs the appropriate XML.

Good luck!

回答2:

I'm a beginner and I had this problem as well. I am using Ubuntu linux w/ php and apache

• Write a php script w/ the following: <?php exec('whoami'); ?> and run it on your server. This tells you who the current user of the script is
• SSH to your server.
• Make a group that has read and write access to the files you need.
• Make group have read, write, and execute on folders you need.
• Make the current user you found in the first step, part of the group that has access to the files you need.
• Restart Apache: sudo apachectl restart

main commands you need are:

• groupadd: Create a new group
• usermod: add your user to a new group
• chgrp: changes files / folders to group you specify
• chmod: changes permissions on the files / folders you specify. All the commands you need are here: http://www.yolinux.com/TUTORIALS/LinuxTutorialManagingGroups.html

回答3:

If you have ACL enabled on the webroot partition just grant the web server username full rights

setfacl -m u:apache:rwx /var/www/html

Replace apache with the web server username and /var/www/html with your webroot location.

回答4:

had the same problem

Looks like apache is running as nobody in the nobody group

so if you do a

useradd -G nobody youruser

chown -R youruser:nobody .

Then change the permission to 0775

chmod -R 0775 .

or you may add nobody to your usergroup

useradd -G nobody yourgroup

this be a better solution

回答5:

777 is pretty normal, because PHP does not run as you, it runs as a PHP user, Apache, etc. The fact is, your webhost should have a higher set of permissions that prevents other users from writing/deleting your files.

回答6:

Does it work with group write enabled (i.e. 775)? Check your group permissions for the directory the file is in. As long as your PHP user (usually www-data) is part of that group, and it's the only user, you should be fine with 775 (or even 774).

回答7:

Like Pascal said! just find your apache user

<?php exec'whoami'; ?>

and then

useradd -G username username2
chown -R username:username2 .
chmod -R 0775 .

And its done! Thank you Pascal!

来源：https://stackoverflow.com/questions/5253670/function-fopen-failed-to-open-stream-permission-denied-in-php