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grpck command

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The grpck command verifies the correctness of the group definitions in the user database files by checking the definitions for ALL the groups or for the groups specified by the Group parameter. If more than one group is specified, there must be a space between the groups.

grpck { -n | -p | -t | -y } { ALL | Group ... }

 

Note: This command writes its messages to stderr.

You must select a flag to indicate whether the system should try to fix erroneous attributes. The following attributes are checked:

Generally, the sysck command calls the grpck command as part of the verification of a trusted-system installation. In addition, the root user or a member of the security group can enter the command.

The grpck command checks to see if the database management security files (/etc/passwd.nm.idx, /etc/passwd.id.idx, /etc/security/passwd.idx, and /etc/security/lastlog.idx) files are up-to-date or newer than the corresponding system security files. Please note, it is alright for the /etc/security/lastlog.idx to be not newer than /etc/security/lastlog. If the database management security files are out-of-date, a warning message appears indicating that the root user should run the mkpasswd command.

Flags

-n Reports errors but does not fix them.
-p Fixes errors but does not report them.
-t Reports errors and asks if they should be fixed.
-y Fixes errors and reports them.

Security

Access Control: This command should grant execute (x) access to the root user and members of the security group. The command should be setuid to the root user and have the trusted computing base attribute.

Files Accessed:

Mode File
r /etc/passwd
r /etc/security/user
rw /etc/security/group
rw /etc/group

Auditing Events:

Event Information
GROUP_User user, groups, attribute | error, status
GROUP_Adms user, groups, attribute | error, status

Examples

  1. To verify that all the group members and administrators exist in the user database, and have any errors reported (but not fixed), enter:

    grpck  -n ALL
     

  2. To verify that all the group members and administrators exist in the user database and to have errors fixed, but not reported, enter:

    grpck  -p ALL  
     

  3. To verify the uniqueness of the group name and group ID defined for the install  group, enter:

    grpck  -n install
     

    OR

    grpck  -t install
     

    OR

    grpck  -y install
     

    The grpck command does not correct the group names and IDs. Therefore, the -n, -t and -y flags report problems with group names and group IDs, but do not correct them.

Files

 

/usr/sbin/grpck Contains the grpck command.
/etc/passwd Contains the basic attributes of users.
/etc/security/user Contains the extended attributes of users.
/etc/group Contains the basic attributes of groups.
/etc/security/group Contains the extended attributes of groups.

Related Information

The pwdck command, sysck command, usrck command.

For more information about the identification and authentication of users, discretionary access control, the trusted computing base, and auditing, refer to Standalone System Security in AIX 5L Version 5.3 Security Guide.

System V grpck command

Syntax

/usr/sysv/bin/grpck

Description

The /usr/sysv/bin/grpck command verifies the correctness of the group definitions in the user database files by checking the definitions for ALL the groups.This /usr/sysv/bin/grpck command is a System V version of the existing grpck command in /usr/sbin/.This command calls the /usr/sbin/grpck command with -n and ALL options.

Exit Status

0
Successful completion.
>0
An error occurred.

Examples

  1. To verify that all the group members and administrators exist in the user database, and have any errors reported (but not fixed), enter:
    /usr/sysv/bin/grpck

Files

/usr/sysv/bin/grpck
Contains the System V version of the grpck command.

Related Information

The /usr/sbin/grpck command.


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