February 10, 2008 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>