VERIEXEC(4)

NAME
veriexec - Veriexec pseudo-device

SYNOPSIS
pseudo-device veriexec

DESCRIPTION
Veriexec verifies the integrity of specified executables and files before they are run or read. This makes it much more difficult to insert a trojan horse into the system and also makes it more difficult to run binaries that are not supposed to be running, for example, packet sniffers, DDoS clients and so on.

The veriexec pseudo-device is used to load and delete entries to and from the in-kernel Veriexec databases, as well as query information about them. It can also be used to dump the entire database.

  Kernel-userland interaction
Veriexec uses proplib(3) for communication between the kernel and userland.

VERIEXEC_LOAD
    Load an entry for a file to be monitored by Veriexec.

    The dictionary passed contains the following elements:
    Name Type Purpose
    file string filename for this entry
    entry-type uint8 entry type (see below)
    fp-type string fingerprint hashing algorithm
    fp data the fingerprint

    “entry-type” can be one or more (binary-OR'd) of the following:
    Type Effect
    VERIEXEC_DIRECT can execute directly
    VERIEXEC_INDIRECT can execute indirectly (interpreter, mmap(2))
    VERIEXEC_FILE can be opened
    VERIEXEC_UNTRUSTED located on untrusted storage

VERIEXEC_DELETE
    Removes either an entry for a single file or entries for an entire mount from Veriexec.

    The dictionary passed contains the following elements:
    Name Type Purpose
    file string filename or mount-point

VERIEXEC_DUMP
    Dump the Veriexec monitored files database from the kernel.

    Only files that the filename is kept for them will be dumped. The returned array contains dictionaries with the following elements:
    Name Type Purpose
    file string filename
    fp-type string fingerprint hashing algorithm
    fp data the fingerprint
    entry-type uint8 entry type (see above)

VERIEXEC_FLUSH
    Flush the Veriexec database, removing all entries.

    This command has no parameters.

VERIEXEC_QUERY
    Queries Veriexec about a file, returning information that may be useful about it.

    The dictionary passed contains the following elements:
    Name Type Purpose
    file string filename

    The dictionary returned contains the following elements:
    Name Type Purpose
    entry-type uint8 entry type (see above)
    status uint8 entry status
    fp-type string fingerprint hashing algorithm
    fp data the fingerprint

    “status” can be one of the following:
    Status Meaning
    FINGERPRINT_NOTEVAL not evaluated
    FINGERPRINT_VALID fingerprint match
    FINGERPRINT_MISMATCH fingerprint mismatch

Note that the requests VERIEXEC_LOAD, VERIEXEC_DELETE, and VERIEXEC_FLUSH are not permitted once the strict level has been raised past 0.

SEE ALSO
proplib(3), sysctl(3), security(8), sysctl(8), veriexecctl(8), veriexecgen(8), veriexec(9)

NOTES
veriexec is part of the default configuration on the following architectures: amd64, i386, prep, sparc64.

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