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"I'm wondering why, on linux, default file permissions permit to all users on the machine to read-only other user's files (chmod 755)."
The default file permissions are kept in /etc/permissions and/or /etc/permissions.d. How the default permissions are set up is defined by the distribution. Many distributions allow you to specify a security level during install. You can later change the default file permissions by changing /etc/permissions and/or /etc/permissions.d.
jailbait, thanks for your answer, but I think these files are suse-specific, since they don't exist on my distrib (redhat).
tinkster, thanks for help, this will help me, but I've got related questions :
- these files affect only shells, right? the modif did not affect proftpd -which as only one umask config, not per-user config-. For php, I don't know how to do. Isn't there a more "global" way to set this ?
- I found that the script giving default umask is /etc/bashrc. Is it safe to modify this file directly, with the umask you specified above? Or is it safer to leave it unchanged and add another umask in another config file, called after ?