Ruleset to catch VSA Juniper-Local-User-Name

[fukhell (fukhell)]

Hello,

my Radius servers sends VSA Juniper-Local-User-Name for Juniper devices depending connected user admin or noc.

I have a dict in conf file and ruleset

radius.dictionary juniper 2636 {
        attribute Juniper-Local-User-Name 1 string
}

                rule map-juniper-radius {
                    enabled = yes
                    script {
                                if (radius[juniper:Juniper-Local-User-Name] == neteng-template) {
                                    profile = admin
                                    permit
                                    }
                                if (radius[juniper:Juniper-Local-User-Name] == gnoc-template) {
                                    profile = noc
                                    permit
                                    }
                    }
                }

But tac doesn't catch that 

[root@tacacs ~]# tac_plus-ng -d 512 /usr/local/etc/mavis/sample/tac_plus-ng.cfg
162841: 12:11:30.732 0/00000000: - Version 87ea4f497104ec39e27d937ae3363e967e40f09c initialized
162841: 12:11:57.087 0/ef48e94a: 10.52.1.53 evaluating ACL __internal__username_acl__
162841: 12:11:57.087 0/ef48e94a: 10.52.1.53  line 502: [user] regex '[]<>/()|=[*"':$]+' => false
162841: 12:11:57.087 0/ef48e94a: 10.52.1.53  line 502: [permit]
162841: 12:11:57.087 0/ef48e94a: 10.52.1.53 ACL __internal__username_acl__: match
162841: 12:11:57.087 0/ef48e94a: 10.52.1.53 looking for user user in MAVIS backend
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 result for user user is ACK [180 ms]
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 evaluating ACL map-juniper-radius
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53  line 292: [radius] juniper:Juniper-Local-User-Name radius 'neteng-template' => false
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53  line 296: [radius] juniper:Juniper-Local-User-Name radius 'gnoc-template' => false
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 ACL map-juniper-radius: no match
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 us...@10.235.9.18: ACL map-juniper-radius: <unknown> (profile: n/a)
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 evaluating ACL allow_all
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53  line 305: [permit]
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 ACL allow_all: match
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 us...@10.235.9.18: ACL allow_all: permit (profile: n/a)
162841: 12:11:57.267 0/ef48e94a: 10.52.1.53 shell login for 'user' from 10.235.9.18 succeeded
162841: 12:11:57.273 1/8327d4da: 10.52.1.53 evaluating ACL map-juniper-radius
162841: 12:11:57.273 1/8327d4da: 10.52.1.53  line 292: [radius] juniper:Juniper-Local-User-Name radius 'neteng-template' => false
162841: 12:11:57.273 1/8327d4da: 10.52.1.53  line 296: [radius] juniper:Juniper-Local-User-Name radius 'gnoc-template' => false
162841: 12:11:57.273 1/8327d4da: 10.52.1.53 ACL map-juniper-radius: no match
162841: 12:11:57.273 1/8327d4da: 10.52.1.53 us...@10.235.9.18: ACL map-juniper-radius: <unknown> (profile: n/a)
162841: 12:11:57.273 1/8327d4da: 10.52.1.53 evaluating ACL allow_all
162841: 12:11:57.273 1/8327d4da: 10.52.1.53  line 305: [permit]
162841: 12:11:57.273 1/8327d4da: 10.52.1.53 ACL allow_all: match
162841: 12:11:57.273 1/8327d4da: 10.52.1.53 us...@10.235.9.18: ACL allow_all: permit (profile: n/a)

[Marc Huber]

Hi,

I'm not sure on what you're trying to achive-- are you using the built-in tac_plus-ng RADIUS functionality or are you using one of the MAVIS backends for RADIUS?

Cheers,

Marc

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[fukhell]

Hi Marc,

I don't use tac_plus-ng RADIUS functionality.

I want to separate authorization based on user type.
Yes I am using the radmavis backend. When my Secured ID RSA Radius
answers with Access-Accept it carries Juniper VSA -
Juniper-Local-User-Name.
This VSA can be with value neteng-template or gnoc-template depending
username, Secure ID has attached radius profiles with this VSA for
users.
So I want to achieve authorization separation if neteng user is
connected it gest a full access, if gnoc user is connected it get a
read-only access.

ср, 3 сент. 2025 г. в 22:49, Marc Huber <marc.j...@gmail.com>:

> To view this discussion visit https://groups.google.com/d/msgid/event-driven-servers/73d17b22-cb18-44e5-a27e-b4433407de87%40googlemail.com.

[Marc Huber]

Hi,

radmavis uses RADIUS as a backend but doesn't propagate RADIUS AV pair
as-is to tac_plus-ng. You can try running radmavis with the
group_attribute=... option, that one should map the selected RADIUS
attribute to a MAVIS TACMEMBER attribute. Something like

radmavis -c /etc/radcli/radiusclient.conf
group_attribute="juniper:Juniper-Local-User-Name"

where "juniper:Juniper-Local-User-Name" needs to be defined in the
radcli (or freeradius-client) RADIUS dictionary.

Basic functionality testing via CLI:

printf "0 TACPLUS\n4 $USER\n8 $PASS\n49 AUTH\n=\n" | radmavis -c
/etc/radcli/radiusclient.conf
group_attribute="juniper:Juniper-Local-User-Name"

Cheers,

Marc

[fukhell]

Hi Marc,

Yes, I've already defined this attr in dictionary.
But I have a lack of knowledge about group_attribute= , how can I use
it in ruleset to compare this is admin or noc user?

чт, 4 сент. 2025 г. в 19:57, Marc Huber <marc.j...@gmail.com>:

> To view this discussion visit https://groups.google.com/d/msgid/event-driven-servers/5d9ab6cc-9a75-4a9b-b04a-75ff4616c5e8%40googlemail.com.

[Marc Huber]

Hi,

tha "group_member" RADIUS value is mapped to a TACMEMBER attribute which
in turn is getting mapped to "member" in ruleset context, so e.g. "if
(member == neteng-template)" would work.

Cheers,

Marc

[fukhell]

Hi Marc,

Looks like it didn't help, how can I check what contains var member?

mavis module = external {
    exec = /usr/local/sbin/radmavis -c "/etc/radcli/radiusclient.conf" group_attribute "juniper:Juniper-Local-User-Name"
}

Ruleset

rule map-juniper-radius {
    enabled = yes
    script {

        if (member == neteng-template) {
            profile = admin
            permit
           }
         if (member == gnoc-template) {
            profile = noc
            permit
          }
    }
}

In this case do I need to activate the group module - mavis module = groups ?

[root@tacacs ~]# tac_plus-ng -d 512 /usr/local/etc/mavis/sample/tac_plus-ng.cfg

335103: 03:03:47.360 0/00000000: - Version 87ea4f497104ec39e27d937ae3363e967e40f09c initialized
335103: 03:04:03.146 0/b7769ba5: 10.52.1.53 evaluating ACL __internal__username_acl__
335103: 03:04:03.146 0/b7769ba5: 10.52.1.53  line 502: [user] regex '[]<>/()|=[*"':$]+' => false
335103: 03:04:03.146 0/b7769ba5: 10.52.1.53  line 502: [permit]
335103: 03:04:03.146 0/b7769ba5: 10.52.1.53 ACL __internal__username_acl__: match

335103: 03:04:03.146 0/b7769ba5: 10.52.1.53 looking for user user in MAVIS backend

Tactrace doesn't work correctly

[root@tacacs perl]# ./tactrace.pl   --authenmethod=tacacsplus --user user --password 84871317
Version: 87ea4f497104ec39e27d937ae3363e967e40f09c
127.0.0.1 ---<start packet>---
127.0.0.1 session id: 00000001, data length: 52
127.0.0.1 Packet malformed, skipping detailed dump.
127.0.0.1 ---<end packet>---
127.0.0.1 Writing AUTHOR/ERROR size=57
127.0.0.1 ---<start packet>---
127.0.0.1 session id: 00000001, data length: 45
127.0.0.1 AUTHOR/REPLY, status=17 (AUTHOR/ERROR)
127.0.0.1 msg_len=39, data_len=0, arg_cnt=0
127.0.0.1 msg (len: 39): Illegal packet (version=0xc0 type=0x02)
127.0.0.1 data (len: 0):
127.0.0.1 ---<end packet>---
- exit status=0
[root@tacacs perl]#

чт, 4 сент. 2025 г. в 21:45, Marc Huber <marc.j...@gmail.com>:

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[Marc Huber]

Hi,

the "exec" line in the "mavis module" section should read

exec = /usr/local/sbin/radmavis radmavis -c /etc/radcli/radiusclient.conf "group_attribute=juniper:Juniper-Local-User-Name"

This also fixes the badly placed quotation mark from my previous example.

For initial attribute checking

printf "0 TACPLUS\n4 $USER\n8 $PASS\n49 AUTH\n=\n" | radmavis -c /etc/radcli/radiusclient.conf "group_attribute=juniper:Juniper-Local-User-Name"

should work.

Cheers,

Marc

To view this discussion visit https://groups.google.com/d/msgid/event-driven-servers/CAEJcWWY0Z%3Dk_hWSKUAwb8pHhQQUMvos9XqrmcKAJ6z5cH42wcw%40mail.gmail.com.