\" $NetBSD: veriexec.5,v 1.8 2017/07/03 21:30:59 wiz Exp $
\"
\" Copyright (c) 1999
\"      Brett Lymn - [email protected], [email protected]
\"
\" This code is donated to The NetBSD Foundation by the author.
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\"      $Id: veriexec.5,v 1.8 2017/07/03 21:30:59 wiz Exp $
\"
Dd March 18, 2011
Dt VERIEXEC 5
Os
Sh NAME
Nm veriexec
Nd format for the
Em Veriexec
signatures file
Sh DESCRIPTION
Em Veriexec
loads entries to the in-kernel database from a file describing files to be
monitored and the type of monitoring.
This file is often referred to as the
Sq signatures database
or
Sq signatures file .
Pp
The signatures file can be easily created using
Xr veriexecgen 8 .
Sh SIGNATURES DATABASE FORMAT
The signatures database has a line based structure, where each line has several
fields separated by white-space (space, tabs, etc.) taking the following form:
Pp
Dl path type    fingerprint     flags
Pp
The description for each field is as follows:
Bl -tag -width "fingerprint"
It Em path
The full path to the file.
White-space characters can be escaped if prefixed with a
Sq \e .
It Em type
Type of fingerprinting algorithm used for the file.
Pp
Requires kernel support for the specified algorithm.
List of fingerprinting algorithms supported by the kernel can be obtained by
using the following command:
Bd -literal -offset indent
# sysctl kern.veriexec.algorithms
Ed
It Em fingerprint
The fingerprint for the file.
Can (usually) be generated using the following command:
Bd -literal -offset indent
% cksum -a <algorithm> <file>
Ed
It Em flags
Optional listing of entry flags, separated by a comma.
These may include:
Bl -tag -width "untrusted"
It Em direct
Allow direct execution only.
Pp
Execution of a program is said to be
Dq direct
when the program is invoked by the user (either in a script, manually typing it,
etc.) via the
Xr execve 2
syscall.
It Em indirect
Allow indirect execution only.
Pp
Execution of a program is said to be
Dq indirect
if it is invoked by the kernel to interpret a script
Pq Dq hash-bang .
It Em file
Allow opening the file only, via the
Xr open 2
syscall (no execution is allowed).
It Em untrusted
Indicate that the file is located on untrusted storage and its fingerprint
evaluation status should not be cached, but rather re-calculated each time
it is accessed.
\"It also enabled per-page fingerprints for the file, causing pages it as
\"backing store to be verified for their integrity as well.
Pp
Fingerprints for untrusted files will always be evaluated on load.
El
Pp
To improve readability of the signatures file, the following aliases are
provided:
Bl -tag -width "interpreter"
It Em program
An alias for
Dq direct .
It Em interpreter
An alias for
Dq indirect
It Em script
An alias for both
Dq direct
and
Dq file .
It Em library
An alias for both
Dq file
and
Dq indirect .
El
Pp
If no flags are specified,
Dq direct
is assumed.
El
Pp
Comments begin with a
Sq \&#
character and span to the end of the line.
Sh SEE ALSO
Xr veriexec 4 ,
Xr security 7 ,
Xr veriexec 8 ,
Xr veriexecctl 8 ,
Xr veriexecgen 8
Sh HISTORY
Nm
first appeared in
Nx 2.0 .
Sh AUTHORS
An Brett Lymn Aq Mt [email protected]
An Elad Efrat Aq Mt [email protected]

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