I've previously only interacted with DSpace as a user so please pardon the
'newb' questions. I'm trying to (re)create a repository that anyone can 
search
via a website but only certain authorized local users can modify.

Given these authentication rules:
host     dspace         dspace     127.0.0.1  255.255.255.255    md5
local    all             all                                     peer
host     all             all             127.0.0.1/32            ident

Aren't all the connections local, (explicitly or due to the 127 address)?

When I have DSpace setup with Tomcat does the database see that as
a local or host connection? Because if it's a host connection then
the md5 host rule will kick in and the user will have to supply a password.
And even then, given the ADDRESS it's still a local connection, right?
So I assumed DSpace web connections would be translated into local
(Tomcat => 'dspace') database queries/connections.

If my 'dspace' database user had no authority to do anything dangerous
and all access attempts are filtered through Tomcat as 'dspace' could I
just 'trust' the connection since I (hopefully) can trust Tomcat? Then users
wouldn't need a password to search our repository. Something like this:

host     dspace         dspace    127.0.0.1  255.255.255.255    md5
local    dspace         dspace                                  trust
local    all            all                                     peer
host     all            all             127.0.0.1/32            ident

Or would that open my site up to all sorts of mischief?
Note: I don't have the Tomcat interface up so I haven't yet tested any of 
this from a browser.

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