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Host.Allow, Host.Deny

Posted on 2007-11-21
Medium Priority
Last Modified: 2013-12-17
I want to refuse a whole set of IP from all services except sending email to us.
eg. IP 89.
In the host.allow file :
sendmail: 89.

In the host.deny file:
ALL: 89.

Is this correct ?

Question by:ChanYiuPong
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Expert Comment

ID: 20332903
Yes you are right

order is this:

1. Allow the connection if it matches a line in hosts.allow. End.

2. Deny the connection if it maches a ling in hosts.deny. End.

3. Allow the connection.

Since the default is to allow any connection that doesn't match,

Author Comment

ID: 20333429
But will the ALL override the sendmail. Do you mean that when it saw sendmail in host.allow with the IP, then it will not check host.deny ?

Author Comment

ID: 20333441
And I should use "sendmail" and not "email" or something like that ?
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Expert Comment

ID: 20333541
ALL : attack_ip : DENY
sendmail : attack_ip : DENY
smtp : attack_ip : DENY

please check this

Expert Comment

ID: 20338630
I agree with ssvl. The allow is parsed before deny. Also just put a sendmail allow and not smtp as it is handled by the sendmail daemon.
LVL 10

Accepted Solution

ssvl earned 1500 total points
ID: 20345982
But will the ALL override the sendmail. Do you mean that when it saw sendmail in host.allow with the IP, then it will not check host.deny

Yes(it check and reject the 2nd occurrence.)

And I should use "sendmail" and not "email" or something like that ?

You should use a service name


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