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MQSeries.net Forum Index » IBM MQ Security » CHLAUTH - Being blocked by Allow access rule

CHLAUTH - Being blocked by Allow access rule

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neverxp

Posted: Sun Jun 13, 2021 4:06 pm Post subject: CHLAUTH - Being blocked by Allow access rule

Newbie

Joined: 13 Jun 2021
Posts: 3

Hi,

I would like to create a channel authentication rule such that it will allow one of my SVRCONN channel accessible to a particular user, and block all other connections. But the allow access rule always blocks the user access when I run match(RUNCHECK) to check.
The rules I copied from IBM website.
--block all users
SET CHLAUTH('TEST.SVR.CONN') TYPE(ADDRESSMAP) ADDRESS('*') USERSRC(NOACCESS) DESCR('block all users') WARN(NO) ACTION(ADD)
--override - no MQM admin rule, allow privileged users
SET CHLAUTH('TEST.SVR.CONN') TYPE(BLOCKUSER) USERLIST('nobody') DESCR('override no mqm admin rule') WARN(NO) ACTION(ADD)
--allow mqtest userid
SET CHLAUTH('TEST.SVR.CONN') TYPE(USERMAP) CLNTUSER('mqtest') USERSRC(CHANNEL) DESCR('allow mqtest userid') ACTION(ADD)

match(RUNCHECK):
display chlauth(TEST.SVR.CONN) match(RUNCHECK) clntuser('mqtest') address('192.168.1.1')
79 : display chlauth(TEST.SVR.CONN) match(RUNCHECK) clntuser('mqtest') address('192.168.1.1')
AMQ8878I: Display channel authentication record details.
CHLAUTH(TEST.SVR.CONN) TYPE(USERMAP)
ADDRESS( ) CLNTUSER(mqtest)
USERSRC(CHANNEL)

fjb_saper

Posted: Sun Jun 13, 2021 8:39 pm Post subject: Re: CHLAUTH - Being blocked by Allow access rule

Grand High Poobah

Joined: 18 Nov 2003
Posts: 20696
Location: LI,NY

neverxp wrote:

I believe you're misinterpreting the runcheck output. It says the rule to be applied is the one you created for usermap.

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neverxp

Posted: Sun Jun 13, 2021 10:35 pm Post subject: Re: CHLAUTH - Being blocked by Allow access rule

Newbie

Joined: 13 Jun 2021
Posts: 3

fjb_saper wrote:

neverxp wrote:

I believe you're misinterpreting the runcheck output. It says the rule to be applied is the one you created for usermap.

Yes, you are right. I got it wrong. But how to tell from the runcheck output that the access is blocked or allowed?

hughson

Posted: Mon Jun 14, 2021 2:42 am Post subject: Re: CHLAUTH - Being blocked by Allow access rule

Padawan

Joined: 09 May 2013
Posts: 1914
Location: Bay of Plenty, New Zealand

neverxp wrote:

Yes, you are right. I got it wrong. But how to tell from the runcheck output that the access is blocked or allowed?

The output is simply showing you the CHLAUTH rule that would match. You can tell by looking at the rule whether it is a block rule or an allow rule from looking at the TYPE and the USERSRC fields.

TYPE(BLOCKUSER) is a blocking rule.
TYPE(BLOCKADDR) is a blocking rule.
TYPE(....MAP) is an allow rule unless USERSRC(NOACCESS) is coded in the rule.

Hope that helps.

Cheers,
Morag
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Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
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neverxp

Posted: Mon Jun 14, 2021 4:09 am Post subject: Re: CHLAUTH - Being blocked by Allow access rule

Newbie

Joined: 13 Jun 2021
Posts: 3

hughson wrote:

neverxp wrote:

Yes, you are right. I got it wrong. But how to tell from the runcheck output that the access is blocked or allowed?

The output is simply showing you the CHLAUTH rule that would match. You can tell by looking at the rule whether it is a block rule or an allow rule from looking at the TYPE and the USERSRC fields.

TYPE(BLOCKUSER) is a blocking rule.
TYPE(BLOCKADDR) is a blocking rule.
TYPE(....MAP) is an allow rule unless USERSRC(NOACCESS) is coded in the rule.

Hope that helps.

Cheers,
Morag

This is really helpful. Thank you

bruce2359

Posted: Mon Jun 14, 2021 9:31 am Post subject: Re: CHLAUTH - Being blocked by Allow access rule

Poobah

Joined: 05 Jan 2008
Posts: 9396
Location: US: west coast, almost. Otherwise, enroute.

neverxp wrote:

The rules I copied from IBM website.
--block all users
SET CHLAUTH('TEST.SVR.CONN') TYPE(ADDRESSMAP) ADDRESS('*') USERSRC(NOACCESS) DESCR('block all users') WARN(NO) ACTION(ADD)

If I may nitpick for a moment... the DESCR above is misleading in that it does not block all users; rather, this is an address-mapping rule that blocks all addresses, and for this channel only.

I bring this up because clients (the human kind) often take literally what they read.
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hughson

Posted: Mon Jun 14, 2021 6:10 pm Post subject: Re: CHLAUTH - Being blocked by Allow access rule

Padawan

Joined: 09 May 2013
Posts: 1914
Location: Bay of Plenty, New Zealand

bruce2359 wrote:

neverxp wrote:

The rules I copied from IBM website.
--block all users
SET CHLAUTH('TEST.SVR.CONN') TYPE(ADDRESSMAP) ADDRESS('*') USERSRC(NOACCESS) DESCR('block all users') WARN(NO) ACTION(ADD)

Yes, I'd be inclined to change the description to be:-

Code:

DESCR('Block all connections to this channel')

Cheers,
Morag
_________________
Morag Hughson @MoragHughson
IBM MQ Technical Education Specialist
Get your IBM MQ training here!
MQGem Software

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