allow_nets=local in passdb gets "auth: Panic"

[Timo Sirainen]

> On 22 Dec 2015, at 01:10, SATOH Fumiyasu <fumiyas at osstech.jp> wrote:
> 
> Hi,
> 
> I have the following configuration in my dovecot.conf for Dovecot 2.2.21:
> 
> passdb {
>  driver = ldap
>  args = /etc/dovecot/dovecot-ldap.conf.ext
>  default_fields = allow_nets=local,127.0.0.1,10.255.1.0/24
> }
> 
> This triggers "auth: Panic" on POP3/IMAP logins as the below:
> 
> Dec 22 14:57:39 localhost dovecot: auth: ldap(u0000,::1,<oiF8SHYngqsAAAAAAAAAAAAAAAAAAAAB>): allow_nets: Invalid network 'local'
> Dec 22 14:57:39 localhost dovecot: auth: Panic: file net.c: line 1137 (net_is_in_network): assertion failed: (IPADDR_IS_V6(ip) == IPADDR_IS_V6(net_ip))
> 
> `doveadm auth test <username> <password>` is no problem as expected.
> 
> What's wrong?

allow_nets can only contain IP/network ranges. You can't use any names like "local". Anyway, it still shouldn't crash. This fixes it:

https://github.com/dovecot/core/commit/f53a1b98d6792a3aa28474fca0901b1de035f8ba