Pode haver mais de um caso, mas o que você aponta foi discutido em um tópico da lista de discussão Pergunta UID / GID da porta do servidor DHCP do ISC em 2008, onde o usuário _dhcp era conhecido por ser uma conta especial (com privilégios diferentes do daemon):
I noticed that, but I believe that that is a privilege separation
account that is used with the OpenBSD-version of the dhclient. Also, as
I pointed out, if this is usable, then why isn't the isc-dhcp-server
port using it instead of allocating a UID/GID for itself during the install?
Erik
Florent Thoumie wrote:
> On Jan 18, 2008 12:01 PM, Erik Van Benschoten <evanben at valleycomnet.com> wrote:
>> Greetings,
>>
>> Is there a specific reason that the port of the ISC's DHCP server does
>> not seem to have/use a registered UID/GID?
>
> Maybe because there's already _dhcp user (uid 65) in base?
Verificando minha máquina FreeBSD 10, vejo outra conta, esta rotulada claramente:
_pflogd:*:64:64:pflogd privsep user:/var/empty:/usr/sbin/nologin
Leitura adicional:
- OpenSSH separado por privilégio
-
- Have dhclient(8) fall back to user nobody if user _dhcp doesn't exist. Helps with upgrades.
- New _dhcp user and group for, funnily enough, the DHCP programs.
- Have dhclient(8) fall back to user nobody if user _dhcp doesn't exist. Helps with upgrades.
-
"usuário / grupo _pflogd: _pflogd" o que há com o _? (lista de discussão freebsd-current, 2004)
-
pf não está fazendo login no 5.3-BETA3? (freebsd -pf mailing list, 2004)
Okay, have you guys read UPDATING?
> 20040623:
> pf was updated to OpenBSD-stable 3.5 and pflogd(8) is privilege
> separated now. It uses the newly created "_pflogd" user/group
> combination. If you plan to use pflogd(8) make sure to run
> mergemaster -p or install the "_pflogd" user and group manually.