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  • Committer: Teddy Hogeborn
  • Date: 2014-06-08 03:10:08 UTC
  • mto: (237.7.272 trunk)
  • mto: This revision was merged to the branch mainline in revision 317.
  • Revision ID: teddy@recompile.se-20140608031008-mc9bd7b024a3q0y0
Address a very theoretical possible security issue in mandos-client.

If there were to run some sort of "cleaner" process for /run/tmp (or
/tmp), and mandos-client were to run for long enough for that cleaner
process to remove the temporary directory for GPGME, there was a
possibility that another unprivileged process could trick the (also
unprivileged) mandos-client process to remove other files or symlinks
which the unprivileged mandos-client process was allowed to remove.
This is not currently known to have been exploitable, since there are
no known initramfs environments running such cleaner processes.

* plugins.d/mandos-client.c (main): Use O_NOFOLLOW when opening
                                    tempdir for cleaning.

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debian/mandos-client.postrm
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#!/bin/sh -e
 
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#!/bin/sh
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# This script can be called in the following ways:
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#
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# After the package was removed:
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# If preinst fails during upgrade:
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#       <new-postrm> abort-upgrade <old-version>
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set -e
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# Update the initial RAM file system image
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update_initramfs()
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        rm --force /etc/mandos/plugin-runner.conf \
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            /etc/keys/mandos/pubkey.txt \
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            /etc/keys/mandos/seckey.txt 2>/dev/null
 
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        update_initramfs
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        ;;
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    upgrade|failed-upgrade|disappear|abort-install|abort-upgrade)
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        ;;
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    *)
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        echo "$0 called with unknown argument \`$1'" 1>&2
 
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        echo "$0 called with unknown argument '$1'" 1>&2
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        exit 1
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        ;;
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esac