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'\" t
.\" Title: pam_tty_audit
.\" Author: [see the "AUTHOR" section]
.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
.\" Date: 09/03/2021
.\" Manual: Linux-PAM Manual
.\" Source: Linux-PAM Manual
.\" Language: English
.\"
.TH "PAM_TTY_AUDIT" "8" "09/03/2021" "Linux-PAM Manual" "Linux\-PAM Manual"
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.\" * Define some portability stuff
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.nh
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.\" * MAIN CONTENT STARTS HERE *
.\" -----------------------------------------------------------------
.SH "NAME"
pam_tty_audit \- Enable or disable TTY auditing for specified users
.SH "SYNOPSIS"
.HP \w'\fBpam_tty_audit\&.so\fR\ 'u
\fBpam_tty_audit\&.so\fR [disable=\fIpatterns\fR] [enable=\fIpatterns\fR]
.SH "DESCRIPTION"
.PP
The pam_tty_audit PAM module is used to enable or disable TTY auditing\&. By default, the kernel does not audit input on any TTY\&.
.SH "OPTIONS"
.PP
\fBdisable=\fR\fB\fIpatterns\fR\fR
.RS 4
For each user matching
\fB\fIpatterns\fR\fR, disable TTY auditing\&. This overrides any previous
\fBenable\fR
option matching the same user name on the command line\&. See NOTES for further description of
\fB\fIpatterns\fR\fR\&.
.RE
.PP
\fBenable=\fR\fB\fIpatterns\fR\fR
.RS 4
For each user matching
\fB\fIpatterns\fR\fR, enable TTY auditing\&. This overrides any previous
\fBdisable\fR
option matching the same user name on the command line\&. See NOTES for further description of
\fB\fIpatterns\fR\fR\&.
.RE
.PP
\fBopen_only\fR
.RS 4
Set the TTY audit flag when opening the session, but do not restore it when closing the session\&. Using this option is necessary for some services that don\*(Aqt
\fBfork()\fR
to run the authenticated session, such as
\fBsudo\fR\&.
.RE
.PP
\fBlog_passwd\fR
.RS 4
Log keystrokes when ECHO mode is off but ICANON mode is active\&. This is the mode in which the tty is placed during password entry\&. By default, passwords are not logged\&. This option may not be available on older kernels (3\&.9?)\&.
.RE
.SH "MODULE TYPES PROVIDED"
.PP
Only the
\fBsession\fR
type is supported\&.
.SH "RETURN VALUES"
.PP
PAM_SESSION_ERR
.RS 4
Error reading or modifying the TTY audit flag\&. See the system log for more details\&.
.RE
.PP
PAM_SUCCESS
.RS 4
Success\&.
.RE
.SH "NOTES"
.PP
When TTY auditing is enabled, it is inherited by all processes started by that user\&. In particular, daemons restarted by a user will still have TTY auditing enabled, and audit TTY input even by other users unless auditing for these users is explicitly disabled\&. Therefore, it is recommended to use
\fBdisable=*\fR
as the first option for most daemons using PAM\&.
.PP
To view the data that was logged by the kernel to audit use the command
\fBaureport \-\-tty\fR\&.
.PP
The
\fB\fIpatterns\fR\fR
are comma separated lists of glob patterns or ranges of uids\&. A range is specified as
\fImin_uid\fR:\fImax_uid\fR
where one of these values can be empty\&. If
\fImin_uid\fR
is empty only user with the uid
\fImax_uid\fR
will be matched\&. If
\fImax_uid\fR
is empty users with the uid greater than or equal to
\fImin_uid\fR
will be matched\&.
.PP
Please note that passwords in some circumstances may be logged by TTY auditing even if the
\fBlog_passwd\fR
is not used\&. For example, all input to an ssh session will be logged \- even if there is a password being typed into some software running at the remote host because only the local TTY state affects the local TTY auditing\&.
.SH "EXAMPLES"
.PP
Audit all administrative actions\&.
.sp
.if n \{\
.RS 4
.\}
.nf
session required pam_tty_audit\&.so disable=* enable=root
.fi
.if n \{\
.RE
.\}
.sp
.SH "SEE ALSO"
.PP
\fBaureport\fR(8),
\fBpam.conf\fR(5),
\fBpam.d\fR(5),
\fBpam\fR(8)
.SH "AUTHOR"
.PP
pam_tty_audit was written by Miloslav Trmač <mitr@redhat\&.com>\&. The log_passwd option was added by Richard Guy Briggs <rgb@redhat\&.com>\&.
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