RemoteAddrValve | IP Subnet

[Madhur Khurana]

Hi,

I am using tomcat8 and would like to configure ip address with subnet in RemoteAddrValve for IP whitelisting (Example: 0.0.0.0/0). Can anyone help in how to configure subnet in allow field.

Thanks,
Madhur

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[André Warnier (tomcat)]

Post by Madhur Khurana
Hi,
I am using tomcat8 and would like to configure ip address with subnet in RemoteAddrValve for IP whitelisting (Example: 0.0.0.0/0). Can anyone help in how to configure subnet in allow field.

The page at http://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_Address_Valve
looks pretty easy to understand.

Example 1 provides the syntax you are looking for.

By combining "allow" and "deny" attributes with the appropriate regular expressions, you
can allow or deny access (aka whitelist or blacklist) from any range of client IP addresses.
Without a precise indication of which IP addresses/subnets you want to "whitelist", there
is not much else anyone here can tell you.

Is it (a) the "regular expression" part that you are having problems with, or (b) the IP
address format, or (c) the definition of a "subnet", or .. ?

For (a), see for example :
http://www.vogella.com/tutorials/JavaRegularExpressions/article.html
For (b) and (c), start perhaps here : https://en.wikipedia.org/wiki/Subnetwork




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[Mark Thomas]

Post by André Warnier (tomcat)

Post by Madhur Khurana
Hi,
I am using tomcat8 and would like to configure ip address with subnet
in RemoteAddrValve for IP whitelisting (Example: 0.0.0.0/0). Can
anyone help in how to configure subnet in allow field.

The page at
http://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_Address_Valve
looks pretty easy to understand.

https://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_CIDR_Valve

might be a better match for what the OP is looking for.

Mark

Post by André Warnier (tomcat)
Example 1 provides the syntax you are looking for.
By combining "allow" and "deny" attributes with the appropriate regular
expressions, you can allow or deny access (aka whitelist or blacklist)
from any range of client IP addresses.
Without a precise indication of which IP addresses/subnets you want to
"whitelist", there is not much else anyone here can tell you.
Is it (a) the "regular expression" part that you are having problems
with, or (b) the IP address format, or (c) the definition of a "subnet",
or .. ?
http://www.vogella.com/tutorials/JavaRegularExpressions/article.html
https://en.wikipedia.org/wiki/Subnetwork
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[André Warnier (tomcat)]

Post by Mark Thomas

Post by André Warnier (tomcat)

Post by Madhur Khurana
Hi,
I am using tomcat8 and would like to configure ip address with subnet
in RemoteAddrValve for IP whitelisting (Example: 0.0.0.0/0). Can
anyone help in how to configure subnet in allow field.

The page at
http://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_Address_Valve
looks pretty easy to understand.

https://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_CIDR_Valve
might be a better match for what the OP is looking for.

With a slight critic of that section though : it states "This valve mimicks Apache's
Order, Allow from and Deny from directives..".
That was Apache httpd up to 2.2, which is end-of-life since 2018/01/01.
Apache httpd 2.4 (the current version) has changed that syntax (and the underlying logic)
quite a bit, and Order, Allow/Deny are now deprecated and replaced by
Require [not] IP
(with a wide variety of expressions for IP)
See https://httpd.apache.org/docs/2.4/mod/mod_authz_host.html

Iow, the reference to "Apache" might best be removed, lest it confuses more than
enlightens the casual reader.

Post by Mark Thomas
Mark

Post by André Warnier (tomcat)
Example 1 provides the syntax you are looking for.
By combining "allow" and "deny" attributes with the appropriate regular
expressions, you can allow or deny access (aka whitelist or blacklist)
from any range of client IP addresses.
Without a precise indication of which IP addresses/subnets you want to
"whitelist", there is not much else anyone here can tell you.
Is it (a) the "regular expression" part that you are having problems
with, or (b) the IP address format, or (c) the definition of a "subnet",
or .. ?
http://www.vogella.com/tutorials/JavaRegularExpressions/article.html
https://en.wikipedia.org/wiki/Subnetwork
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[Christopher Schultz]

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Hash: SHA256

André,

Post by André Warnier (tomcat)

Post by Mark Thomas

Post by André Warnier (tomcat)

Post by Madhur Khurana
Hi,
I am using tomcat8 and would like to configure ip address
0.0.0.0/0). Can anyone help in how to configure subnet in
allow field.

The page at
http://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_Add

ress_Valve
looks pretty easy to understand.

Post by André Warnier (tomcat)

Post by Mark Thomas
https://tomcat.apache.org/tomcat-8.5-doc/config/valve.html#Remote_CID

R_Valve
might be a better match for what the OP is looking for.

Post by André Warnier (tomcat)
With a slight critic of that section though : it states "This
valve mimicks Apache's Order, Allow from and Deny from
directives..". That was Apache httpd up to 2.2, which is
end-of-life since 2018/01/01. Apache httpd 2.4 (the current
version) has changed that syntax (and the underlying logic) quite a
bit, and Order, Allow/Deny are now deprecated and replaced by
Require [not] IP (with a wide variety of expressions for IP) See
https://httpd.apache.org/docs/2.4/mod/mod_authz_host.html
Iow, the reference to "Apache" might best be removed, lest it
confuses more than enlightens the casual reader.

Perhaps. Why not just patch it, then? ;)

- -chris
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