veriexec(5) - NetBSD Manual Pages

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VERIEXEC(5)               NetBSD File Formats Manual               VERIEXEC(5)


NAME

     veriexec -- format for the Veriexec signatures file


DESCRIPTION

     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 `signatures database' or `signatures file'.

     The signatures file can be easily created using veriexecgen(8).


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:

           path type fingerprint    flags

     The description for each field is as follows:

     path         The full path to the file.  White-space characters can be
                  escaped if prefixed with a `\'.

     type         Type of fingerprinting algorithm used for the file.

                  Requires kernel support for the specified algorithm.  List
                  of fingerprinting algorithms supported by the kernel can be
                  obtained by using the following command:

                        # sysctl kern.veriexec.algorithms

     fingerprint  The fingerprint for the file.  Can (usually) be generated
                  using the following command:

                        % cksum -a <algorithm> <file>

     flags        Optional listing of entry flags, separated by a comma.
                  These may include:

                  direct     Allow direct execution only.

                             Execution of a program is said to be ``direct''
                             when the program is invoked by the user (either
                             in a script, manually typing it, etc.) via the
                             execve(2) syscall.

                  indirect   Allow indirect execution only.

                             Execution of a program is said to be ``indirect''
                             if it is invoked by the kernel to interpret a
                             script (``hash-bang'').

                  file       Allow opening the file only, via the open(2)
                             syscall (no execution is allowed).

                  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.

                             Fingerprints for untrusted files will always be
                             evaluated on load.

                  To improve readaibility of the signatures file, the follow-
                  ing aliases are provided:

                  program      An alias for ``direct''.

                  interpreter  An alias for ``indirect''

                  script       An alias for both ``direct'' and ``file''.

                  library      An alias for both ``file'' and ``indirect''.

                  If no flags are specified, ``direct'' is assumed.

     Comments begin with a `#' character and span to the end of the line.


SEE ALSO

     veriexec(4), security(7), veriexec(8), veriexecctl(8), veriexecgen(8)


HISTORY

     veriexec first appeared in NetBSD 2.0.


AUTHORS

     Brett Lymn <blymn@NetBSD.org>
     Elad Efrat <elad@NetBSD.org>

NetBSD 6.1                      March 18, 2011                      NetBSD 6.1