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Top Forums UNIX for Advanced & Expert Users Non root user access to /dev/mem Post 303021413 by Neo on Thursday 9th of August 2018 05:53:26 AM
Old 08-09-2018
The instructions are pretty clear in that doc you added:

Quote:
Before running Perceptive Content Server as a non-root user on a shadowed system, you need to configure Role Based Access Control (RBAC) or an Access Control List (ACL).

If your Linux distributor offers RBAC as a supported package or embeds it into the Linux Kernel, you can use the configuration options detailed in the following sections of this document. Otherwise, to achieve rootless authentication, you need to download a third party RBAC kernel module from a trusted source.

Verify that the RBAC kernel provides the roles necessary to read your shadowed passwd file, and can provide read access to /dev/mem. While you can grant ACL read privileges to /etc/shadow, a kernel module/patch is required to grant read privileges to /dev/mem and cannot be granted with ACL privileges alone.

If you are unable to locate a trustable source or you are concerned about security issues with downloading a third party RBAC kernel module, you can use the built in security features of Perceptive

Content to release root privileges and run as another user after server initialization. To use these built insecurity features, you need to configure daemons to run on a non-root user account.
Did you verify your Linux kernel has been built to permit RBAC per the instructions?
 

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GRADM(8)						      System Manager's Manual							  GRADM(8)

NAME
gradm - Administration program for the grsecurity RBAC system SYNOPSIS
gradm [ -E ] [ -R ] [ -C ] [ -F ] [ -L <logfile> ] [ -O <filename|stream> ] [ -M <filename|uid> ] [ -D ] [ -P [rolename] ] [ -a <rolename> ] [ -n <rolename> ] [ -p <rolename> ] [ -u ] [ -V ] [ -h ] [ -v ] DESCRIPTION
gradm is the userspace RBAC parsing and authentication program for grsecurity grsecurity aims to be a complete security system for Linux 2.4. gradm performs several tasks for the RBAC system including authenticated via a password to the kernel and parsing rules to be passed to the kernel. OPTIONS
All options to gradm are mutually exclusive, except for -L and -O. -E Enable the RBAC system -R Reload the RBAC system (only valid while in admin mode) -C Perform a check of the RBAC policy, running the same analysis against it that is performed when enabling. -F Toggle full learning mode. If used only with -L, it enables the RBAC system in full learning mode. If used with -L and -O, it parses the full learning logs and generates a complete ruleset. -M <filename|uid> Remove an execution ban on a given uid or filename that has been put in place by the RES_CRASH resource restriction of the RBAC sys- tem. -L <logfile> Parses the learning logs. Accepts an argument which specifies the logfile to scan for the learning logs. If "-" is specified as the logfile, stdin will be used as the learning log. This option can be used with -E, -O, or -F. -O <filename|stream> Specifies output mode. Requires a single argument that can be "stdout", "stderr", or a regular file. Only used with -L or -F. -D Disable the RBAC system -P [rolename] Without an argument, it sets the password for administering the RBAC system. With a role name as an argument, it sets the password for that given special role. -a <rolename> Authenticate to a special role that requires a password. -n <rolename> Authenticate to a special role that does not require a password. -p <rolename> Authenticate through PAM to a special role. -u Removes yourself from your current special role, reverting back to the normal role selection. To be used, for instance, for logging out of an admin role without exiting your shell. -V Displays verbose policy statistics when enabling the RBAC system or checking the RBAC policy. Can only be used with -C, -E, or -F -L <filename> -h Display help information -v Print version information and exit REPORTING BUGS
Please include as much information as possible(using any available debugging options) and send bug reports for gradm or the grsecurity RBAC system to spender@grsecurity.net. AUTHOR
grsecurity and gradm were created and are maintained by Brad Spengler <spender@grsecurity.net> GRADM(8)
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