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Top Forums UNIX for Advanced & Expert Users Prevent user from creating new user from his login Post 303032101 by bakunin on Monday 11th of March 2019 10:33:03 AM
Old 03-11-2019
Quote:
Originally Posted by jim mcnamara
Off the top of mu head, this seems contradictory. If you have read, write, and execute on any file, that means new user creation is possible. If you employ ACL's and block this special user from accessing files then what happens when the user employs setfacl (or whatever tool) to undo your change to the ACL?
Absolutely! If someone is allowed to do "everything" then everything it is - no less!

I remember a former customer took away root privileges for a certain system from us system administrators but because we were still supposed to edit a certain file owned by root (!) they created a sudo rule for us:

Code:
myuser ALL=(ALL)   vi /path/to/some/dir/*

They wondered why we still became root whenever we needed to and probably still are wondering, LOL!

Quote:
Originally Posted by jim mcnamara
Note: Linux system roles are beginning to receive support, I think the concept was demonstrated well in Solaris 10. I do not know how robust the support of roles using Ansible is in your version of RH.
I don't know Solaris too well but RBAC (Role Based Access Control) is available in AIX for about 10-15 years. I would strongly prefer jumping out of the next available window to using it, though. It makes the administration of a system practically impossible (yes, i know all the "but"s - i still stand by what i said). My advice: stay away as far as you can. If you can't do it with standard UNIX privileges it isn't worth doing and/or your model is plain wrong.

I hope this helps.

bakunin
This User Gave Thanks to bakunin For This Post:
 

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rbacdbchk(1M)															     rbacdbchk(1M)

NAME
rbacdbchk - Verifies the syntax of the Role-Based Access Control (RBAC) database files SYNOPSIS
DESCRIPTION
verifies that there are no conflicting or inconsistent entries in and amongst the RBAC database files. also checks the syntax of the data- base files and prints messages indicating which lines contain errors. returns zero output if no errors are present in the database files. All the RBAC database files and are verified. See rbac(5) for more information on these RBAC database files. Options supports the following options: Checks the database. Checks the database. Checks the database. Checks the database. Checks the database. Cross reference checks all databases. EXTERNAL INFLUENCES
Environment Variables determines the language in which messages are displayed. International Code Set Support Single-byte character code set is supported. RETURN VALUE
0. Success 1. Incorrect syntax EXAMPLES
The following example finds an error that user is an invalid user # rbacdbchk [/etc/rbac/user_role] John: Administrator invalid user The value 'John' for the Username field is bad. The following example finds a syntax error, an extra colon at the end of a line: # rbacdbchk [/etc/rbac/user_role] root: Administrator: invalid name: Not alphanumeric The value 'Administrator:' for the Rolename field is bad. [Role in role_auth DB with no assigned user in user_role DB] Administrator:(hpux.*, *) The following example finds a field missing: # rbacdbchk [/etc/rbac/roles] : my comment invalid name: <empty> The value '' for the Rolename field is bad. The following example finds a bad role: # rbacdbchk [Role in role_auth DB with no assigned user in user_role DB] blah:(hpux.*, *) [Invalid Role in role_auth DB. Role 'blah' does not exist in the roles DB] blah:(hpux.*, *) The following example finds a bad group name: # rbacdbchk [/etc/rbac/user_role] &blah: Administrator invalid group The value 'blah' for the Group name field is bad. FILES
Database containing valid definitions of all roles. Database containing definitions of all valid authorizations. Database specifying the roles for each specified user. Database that defines the authorizations for each role. Database containing the authorization to execute specified commands, and the privileges to alter uid and gid for command execution. Database that defines the role-to-authorization to audit SEE ALSO
authadm(1M), cmdprivadm(1M), privrun(1M), rbac(5). rbacdbchk(1M)
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