05-27-2009
www-data does not get login rights as default to protect from using it as an ssh login. You would have to look at the man page for "moduser" or use a gui user admin tool to change that.
It is of course doing that for security reasons and changing the setting is unadvisable if your connected to the internet.
Can't you "chown" the executable to the www-data user or chmod 777 [exe] the file so it is runnable by all users, this would be more secure as it would affect only that exe and you evidently want a cgi script to have access to it.
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LEARN ABOUT DEBIAN
login.access
LOGIN.ACCESS(5) BSD File Formats Manual LOGIN.ACCESS(5)
NAME
login.access -- login access control table
DESCRIPTION
The login.access file specifies on which ttys or from which hosts certain users are allowed to login.
At login, the /etc/login.access file is checked for the first entry that matches a specific user/host or user/tty combination. That entry can
either allow or deny login access to that user.
Each entry have three fields separated by colon:
o The first field indicates the permission given if the entry matches. It can be either ``+'' (allow access) or ``-'' (deny access) .
o The second field is a comma separated list of users or groups for which the current entry applies. NIS netgroups can used (if configured)
if preceeded by @. The magic string ALL matches all users. A group will match if the user is a member of that group, or it is the user's
primary group.
o The third field is a list of ttys, or network names. A network name can be either a hostname, a domain (indicated by a starting period),
or a netgroup. As with the user list, ALL matches anything. LOCAL matches a string not containing a period.
If the string EXCEPT is found in either the user or from list, the rest of the list are exceptions to the list before EXCEPT.
BUGS
If there's a user and a group with the same name, there is no way to make the group match if the user also matches.
SEE ALSO
login(1)
AUTHORS
The login_access() function was written by Wietse Venema. This manual page was written for Heimdal.
HEIMDAL
March 21, 2003 HEIMDAL