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Operating Systems AIX Gid=0 and 7 + admin=FALSE
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Old 10-05-2010
Question Gid=0 and 7 + admin=FALSE

Checking configuration access files for an AIX server, left me wondering about this Smilie:
  • If a user is added to system group, it gets gid=0 with some security risks because it gets some root kind of file access level.
  • Is this insecure condition kept if the user has admin variable equal to FALSE in /etc/security/user file?
  • What happen if the user is also part of security group (gid=7).
What is the resultant combination of having gid=0,7 and ADMIN=FALSE?
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group(4)							   File Formats 							  group(4)

NAME
group - group file DESCRIPTION
The group file is a local source of group information. The group file can be used in conjunction with other group sources, including the NIS maps group.byname and group.bygid, the NIS+ table group, or group information stored on an LDAP server. Programs use the getgrnam(3C) routines to access this information. The group file contains a one-line entry for each group recognized by the system, of the form: groupname:password: gid:user-list where groupname The name of the group. gid The group's unique numerical ID (GID) within the system. user-list A comma-separated list of users allowed in the group. The maximum value of the gid field is 2147483647. To maximize interoperability and compatibility, administrators are recommended to assign groups using the range of GIDs below 60000 where possible. If the password field is empty, no password is demanded. During user identification and authentication, the supplementary group access list is initialized sequentially from information in this file. If a user is in more groups than the system is configured for, {NGROUPS_MAX}, a warning will be given and subsequent group specifications will be ignored. Malformed entries cause routines that read this file to halt, in which case group assignments specified further along are never made. To prevent this from happening, use grpck(1B) to check the /etc/group database from time to time. Previous releases used a group entry beginning with a `+' (plus sign) or `-' (minus sign) to selectively incorporate entries from a naming service source (for example, an NIS map or data from an LDAP server) for group. If still required, this is supported by specifying group:compat in nsswitch.conf(4). The compat source may not be supported in future releases. Possible sources are files followed by ldap or nisplus. This has the effect of incorporating information from an LDAP server or the entire contents of the NIS+ group table after the group file. EXAMPLES
Example 1: Sample of a group File. Here is a sample group file: root::0:root stooges:q.mJzTnu8icF.:10:larry,moe,curly and the sample group entry from nsswitch.conf: group: files ldap With these entries, the group stooges will have members larry, moe, and curly, and all groups listed on the LDAP server are effectively incorporated after the entry for stooges. If the group file was: root::0:root stooges:q.mJzTnu8icF.:10:larry,moe,curly +: and the group entry from nsswitch.conf: group: compat all the groups listed in the NIS group.bygid and group.byname maps would be effectively incorporated after the entry for stooges. SEE ALSO
groups(1), grpck(1B), newgrp(1), getgrnam(3C), initgroups(3C), nsswitch.conf(4), unistd.h(3HEAD) System Administration Guide: Basic Administration SunOS 5.10 22 Jul 2004 group(4)

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