Role-Based Access Control
In addition to the default roles that Cumulus Linux provides, you can create your own roles to restrict authorization, giving you more granular control over what a user can manage on the switch. For example, you can assign a user the role of network manager and provide the user privileges for interface management, service management and system management. When the user logs in and executes an NVUE command, NVUE checks the user privileges and authorizes the user to run that command.
Custom role-based access control consists of the following elements:
Element | Description |
---|---|
Role | A virtual identifier for multiple classes (groups). You can assign only one role for a user. For example, for a user that can manage interfaces, you can create a role called IFMgr . |
Class | A class is similar in concept to a Linux group. Creating and managing classes is the simplest way to configure multiple users simultaneously, especially when configuring permissions.A class consists of:
|
Action | The action for the class: allow or deny . |
- You can assign a maximum of 64 classes to a role.
- You can configure a maximum of 128 command paths for a class.
- When you configure a command path, you allow or deny a specific schema path and its children. For example the command path
/qos/
allows or denies access to QoS commands, whereas the command path/qos/egress-scheduler
allows or denies access to QoS egress scheduler commands.
The following example describes the permissions for a role (role1
) that consists of three classes: class1
, class2
, class3
class1 has the allow
class action and the following command path permissions:
Command Path | Permissions |
---|---|
/interface/ | all |
/interface/*/acl/ | ro |
/interface/*/ptp/ | ro |
class2 has the allow
class action and the following command path permissions:
Command Path | Permissions |
---|---|
/system/ | ro |
/vrf/ | rw |
class3 has the deny
class action and the following command path permissions:
Command Path | Permissions |
---|---|
/interface/*/evpn/ | rw |
/interface/*/qos/ | rw |
The following table shows the permissions for a user assigned the role role1
. In the table, R is read only (RO), W is write, and X is action (ACT).
Path | Allow | Deny | Permissions |
---|---|---|---|
/acl/ | RWX | Implicit deny | |
/qos/ | RWX | Implicit deny | |
All unspecified paths are implicit deny | |||
/interface/ | RWX | The permissions specified | |
/interface/* (* matches all interfaces) | RWX | Inherited from parent | |
/interface/*/bond/ | RWX | Inherited from parent | |
/interface/*/ip/ | RWX | Inherited from parent | |
All unspecified children of /interface/ inherit parent permissions | RWX | ||
/interface/*/acl/ | R | WX | The permissions specified |
/interface/*/ptp/ | R | WX | The permissions specified |
/interface/*/evpn/ | RWX | The permissions specified | |
/interface/*/qos/ | RWX | The permissions specified | |
/system/ | R | WX | The permissions specified |
/system/aaa/ | R | WX | Inherited from parent |
/system/api/ | R | WX | Inherited from parent |
All unspecified children of /system/ inherit parent permissions | R | ||
/vrf/ | RW | X | The permissions specified |
All unspecified children of /vrf/ inherit parent permissions | RW | X |
Assign a Custom Role to a User Account
To assign a custom role to a user account:
- Create a role and classes for the role.
- Assign the action (allow or deny) for each class.
- Add command paths and permissions for each class.
- Assign a role to a user.
You assign a custom role to an existing user account. For information about creating user accounts, see User Accounts commands.
When you create a class, then run nv config apply
, NVUE removes LDAP configuration from the /etc/nsswitch.conf
file. If you are using LDAP, run the nv set system config apply ignore /etc/nsswitch.conf
command before you run nv config apply
to keep the LDAP configuration.
The following example creates the three classes described above for role role1
.
class1
has permissions to manage all interfaces except for ACL and PTP interfaces, which only have show
permissions:
cumulus@leaf01:mgmt:~$ nv set system aaa role ROLE1 class class1
cumulus@leaf01:mgmt:~$ nv set system aaa class class1 action allow
cumulus@leaf01:mgmt:~$ nv set system aaa class class1 command-path /interface/ permission all
cumulus@leaf01:mgmt:~$ nv set system aaa class class1 command-path /interface/*/acl/ permission ro
cumulus@leaf01:mgmt:~$ nv set system aaa class class1 command-path /interface/*/ptp/ permission ro
cumulus@leaf01:mgmt:~$ nv config apply
class2
has permissions to only show system commands and to set, unset, and apply VRF commands:
cumulus@leaf01:mgmt:~$ nv set system aaa role ROLE1 class class2
cumulus@leaf01:mgmt:~$ nv set system aaa class class2 action allow
cumulus@leaf01:mgmt:~$ nv set system aaa class class2 command-path /system/ permission ro
cumulus@leaf01:mgmt:~$ nv set system aaa class class2 command-path /vrf/ permission rw
cumulus@leaf01:mgmt:~$ nv config apply
class3
prevents setting, unsetting, and applying interface commands for EVPN and QOS:
cumulus@leaf01:mgmt:~$ nv set system aaa role ROLE1 class class3
cumulus@leaf01:mgmt:~$ nv set system aaa class class3 action deny
cumulus@leaf01:mgmt:~$ nv set system aaa class class3 command-path /interface/*/evpn/ permission rw
cumulus@leaf01:mgmt:~$ nv set system aaa class class3 command-path /interface/*/qos/ permission rw
cumulus@leaf01:mgmt:~$ nv config apply
The following command assigns user admin2
the role role1
:
cumulus@leaf01:mgmt:~$ nv set system aaa user admin2 role role1
cumulus@leaf01:mgmt:~$ nv config apply
Delete Custom Roles
To delete a custom role and all its classes, you must first unassign the role from the user, then delete the role:
cumulus@switch:~$ nv unset system aaa user admin2 role role1
cumulus@switch:~$ nv unset system aaa role role1
cumulus@switch:~$ nv config apply
To delete a class from a role, run the nv unset system aaa role <role> class <class>
command:
cumulus@switch:~$ nv unset system aaa role role1 class class2
cumulus@switch:~$ nv config apply
Show Custom Role Information
To show the user accounts configured on the system, run the NVUE nv show system aaa user
command or the Linux sudo cat /etc/passwd
command.
cumulus@switch:~$ nv show system aaa user
Username Full-name Role enable Summary
---------------- ---------------------------------- ------- ------ -------
_apt Unknown system
_lldpd Unknown system
backup backup Unknown system
bin bin Unknown system
cumulus cumulus,,, Unknown on
daemon daemon Unknown system
dnsmasq dnsmasq,,, Unknown system
frr Frr routing suite,,, Unknown system
games games Unknown system
gnats Gnats Bug-Reporting System (admin) Unknown system
irc ircd Unknown system
list Mailing List Manager Unknown system
lp lp Unknown system
mail mail Unknown system
man man Unknown system
messagebus Unknown system
news news Unknown system
nobody nobody Unknown off
ntp Unknown system
nvue NVIDIA User Experience Unknown system
proxy proxy Unknown system
root root Unknown system
snmp Unknown system
sshd Unknown system
sync sync Unknown system
sys sys Unknown system
systemd-coredump systemd Core Dumper Unknown system
systemd-network systemd Network Management,,, Unknown system
systemd-resolve systemd Resolver,,, Unknown system
systemd-timesync systemd Time Synchronization,,, Unknown system
admin2 role1 on
uucp uucp Unknown system
uuidd Unknown system
www-data www-data Unknown system
To show information about a specific user account including the role assigned to the user, run the NVUE nv show system aaa user <user>
command:
cumulus@switch:~$ nv show system aaa user admin2
operational applied
--------- ----------- -------
role role1 role1
full-name
enable on on
To show all the roles configured on the switch, run the NVUE nv show system aaa role
command:
cumulus@switch:~$ nv show system aaa role
Role Class
------------ -------
nvue-admin nvapply
nvue-monitor nvshow
role1 class1
class2
class3
system-admin nvapply
sudo
To show the classes applied to specific role, run the nv show system aaa role <role>
command:
cumulus@switch:~$ nv show system aaa role role1
applied
------- -------
[class] class1
[class] class2
[class] class3
To show all the classes configured on the switch, run the nv show system aaa class
command:
cumulus@switch:~$ nv show system aaa class
Class Name Command Path Permission Action
---------- ------------------ ---------- ------
class1 /interface/ all allow
/interface/*/acl/ ro
/interface/*/ptp/ ro
class2 /system/ ro allow
/vrf/ rw
class3 /interface/*/evpn/ rw deny
/interface/*/qos/ rw
nvapply / all allow
nvshow / ro allow
sudo / all allow
To show the configuration and state of the command paths for a class, run the nv show system aaa class <class>
command:
cumulus@switch:~$ nv show system aaa class class3
applied
-------------- ------------------
action deny
[command-path] /interface/*/evpn/
[command-path] /interface/*/qos/