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AIX auditing
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audit(5) File Formats Manual audit(5) NAME
audit - introduction to HP-UX Auditing System DESCRIPTION
The purpose of the auditing system is to record instances of access by subjects to objects and to allow detection of any (repeated) attempts to bypass the protection mechanism and any misuses of privileges, thus acting as a deterrent against system abuses and exposing potential security weaknesses in the system. User and Event Selection The auditing system provides administrators with a mechanism to select users and activities to be audited. On a system that has been converted to trusted mode, users are assigned unique identifiers called by the administrator, which remain unchanged throughout a user's history. See about trusted mode. The command is used to specify those users who are to be audited. On a system that has not been converted to trusted mode, each login session is assigned a unique identifier called The is a string repre- senting information such as user name and login time. It can uniquely identify each login session and the person responsible for the ses- sion. See also setauduser(3) and getauduser(3). The command is used to specify those users who are to be audited. See userdbset(1M) and userdb(4). The associated attribute is called and is described in security(4). The command is used to specify system activities (auditable events) that are to be audited. Auditable events are classified into event categories and profiles for easier configuration. Once an event category or a profile is selected, all system calls and self-auditing events associated with that event category or profile are selected. When the auditing system is installed, a default set of event classi- fication information is provided in file In order to meet site-specific requirements, administrators may also define event categories and profiles in See audit.conf(4) and audevent(1M) for more information. Note that even if an user is not selected for auditing, it is expected that some records may still be generated at the time user starts a session and ends a session. Those are considered as system-wise information that are more in favor of event selection than the user selec- tion. Other programs that do self-auditing may also make arbitrary decision to ignore the user selection though it is not recommended. More information about self-auditing programs can be found later. Starting and Halting the Auditing System The administrator can use the command to start or halt the auditing system, or to get a brief summary of the status of the audit system. Prior to starting the auditing system, also validates the parameters specified, and ensures that the auditing system is in a safe and con- sistent state. See audsys(1M) for more information. Monitoring the Auditing System To ensure that the auditing system operates normally and to detect abnormal behaviors, a privileged program, runs in the background to mon- itor various auditing system parameters. When these parameters take on abnormal (dangerous) values, or when components of the auditing system are accidentally removed, prints warning messages and tries to resolve the problem if possible. See audomon(1M) for more informa- tion. can be spawned by (as part of the start-up process) when the system is booted up if the parameter AUDITING is set to 1 in file It can also be started any time by a privileged user. Viewing of Audited Data The command is used to view audited data recorded in log files. The command merges the log files into a single audit trail in chronologi- cal sequence. The administrator can select viewing criteria provided by the command to limit the search to particular kinds of events which the administrator is interested in investigating. Audit Trails At any time when the auditing system is enabled, at least an audit trail must be present. The trail name and various attributes for the trail can be specified using When the current trail exceeds the specified size, or when the auditing file system is dangerously full, the system automatically switches to another trail with the same base name but a different timestamp extension and begin recording to it. A script can be specified using to perform various operations on the last audit trail after each successful switch. If trail switch is unsuccessful, warning messages are sent to request appropriate administrator action. Self-auditing Programs To reduce the amount of log data and to provide a higher-level recording of some typical system operations, a collection of privileged pro- grams are given capabilities to perform self-auditing. This means that the programs can suspend the currently specified auditing on them- selves and produce a high-level description of the operations they perform. These self-auditing programs are described in the following manpages: at(1), chfn(1), chsh(1), crontab(1), login(1), newgrp(1), passwd(1), audevent(1M), audisp(1M), audsys(1M), audusr(1M), cron(1M), groupadd(1M), groupdel(1M), groupmod(1M), init(1M), lpsched(1M), sam(1M), useradd(1M), userdel(1M), and usermod(1M). Note: Only privileged programs are allowed to do self-auditing. The audit suspension they perform only affects these programs and does not affect any other processes on the system. Most of these commands generate audit data under a single event category. For example, generates the audit data under the event admin. Other commands may generate data under multiple event categories. For example, the command generates data under the events login and admin. For a list of predefined event categories, see audevent(1M). WARNINGS
HP-UX 11i Version 3 is the last release to support trusted systems functionality. The HP-UX Auditing System continues to work without converting to trusted mode. AUTHOR
The auditing system described above was developed by HP. SEE ALSO
audevent(1M), audisp(1M), audsys(1M), audusr(1M), userdbset(1M), audctl(2), audswitch(2), audwrite(2), getaudid(2), getevent(2), setau- did(2), setevent(2), getauduser(3), setauduser(3), audit(4), security(4), userdb(4), audit_memory_usage(5), audit_track_paths(5), diskau- dit_flush_interval(5). audit(5)
AIX auditing