| 1 | Documentation for sh_mounts, the samhain "Mounts" module.
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| 2 | ---------------------------------------------------------
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| 3 | sh_mounts implements functionality we had in a policy-checking Perl script we
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| 4 | have here at eircom; basically, all it does is ensure that certain mounts are
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| 5 | there (for example, /, /tmp, /var, /usr, /home) and that certain options are
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| 6 | specified on those mounts (for example noexec,nosuid on /tmp).
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| 7 |
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| 8 | All quite simple. It wouldn't be too hard to extend this module somewhat, to
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| 9 | report any NFS mounts found, for example, or to test that _only_ the mounts
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| 10 | specified are mounted on the machine.
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| 11 |
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| 12 | Here's a bit for the manual:
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| 13 |
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| 14 | <Begin manual entry>
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| 15 |
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| 16 | Checking mounted filesystem policies
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| 17 | ------------------------------------
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| 18 | samhain can be compiled to check if certain filesystems are mounted, and if they
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| 19 | are mounted with the appropriate options. This module currently supports Linux,
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| 20 | Solaris and FreeBSD. The configuration of the module is done in the Mounts
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| 21 | section of the configuration file:
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| 22 |
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| 23 | -------->8---------
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| 24 |
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| 25 | [Mounts]
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| 26 | #
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| 27 | # Activate (0 is off).
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| 28 | #
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| 29 | MountCheckActive=1
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| 30 |
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| 31 | #
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| 32 | # Interval between checks.
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| 33 | #
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| 34 | MountCheckInterval=7200
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| 35 |
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| 36 | #
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| 37 | # Logging severities. We have two checks: to see if a mount is there, and to
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| 38 | # see if it is mounted with the correct options.
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| 39 | #
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| 40 | SeverityMountMissing=warn
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| 41 | SeverityOptionMissing=warn
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| 42 |
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| 43 | #
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| 44 | # Mounts to check for, followed by lists of options to check on them.
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| 45 | #
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| 46 | checkmount=/
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| 47 | checkmount=/var
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| 48 | checkmount=/usr
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| 49 | checkmount=/tmp noexec,nosuid,nodev
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| 50 | checkmount=/home noexec,nosuid,nodev
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| 51 |
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| 52 | -------->8---------
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| 53 |
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| 54 | <End manual entry>
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| 55 |
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| 56 | The module is enabled as part of the compilation of samhain by specifying
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| 57 | --enable-mounts-check
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| 58 |
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| 59 | This module by the eircom.net Computer Incident Response Team
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