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  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 16:53:00 UTC
  • Revision ID: teddy@recompile.se-20241117165300-02hxm96s8cj9528e
mandos: Avoid closing configured server network socket

If we are passed a pre-created created network socket as a file
descriptor, we must avoid later closing it (when stdin, stdout and
stderr are dup2()ed over with /dev/null) by making sure that the
network file descriptor is not 0, 1, or 2, by creating a new file
descriptor if necessary.

However, when we create a new file descriptor we must check that the
new file descriptor is not 0, 1, or 2 either, and try again until we
get a suitable file descriptor.

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debian/mandos-client.postrm
 
1
#!/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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#       <postrm> remove
 
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#
 
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# After the package was purged:
 
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#       <postrm> purge
 
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#
 
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# After the package was upgraded:
 
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#       <old-postrm> upgrade <new-version>
 
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# if that fails:
 
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#       <new-postrm> failed-upgrade <old-version>
 
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#
 
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#
 
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# After all of the packages files have been replaced:
 
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#       <postrm> disappear <overwriting-package> <version>
 
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#
 
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#
 
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# If preinst fails during install:
 
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#       <new-postrm> abort-install
 
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#
 
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# If preinst fails during upgrade of removed package:
 
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#       <new-postrm> abort-install <old-version>
 
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#
 
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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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{
 
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    if command -v update-initramfs >/dev/null; then
 
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        update-initramfs -k all -u 1>&2
 
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    elif command -v dracut >/dev/null; then
 
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        # Logic taken from dracut.postinst
 
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        for kernel in /boot/vmlinu[xz]-*; do
 
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            kversion="${kernel#/boot/vmlinu[xz]-}"
 
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            if [ "$kversion" != "*" ]; then
 
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                /etc/kernel/postinst.d/dracut "$kversion" 1>&2
 
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            fi
 
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        done
 
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    fi
 
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}
 
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case "$1" in
 
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    remove)
 
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        update_initramfs
 
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        ;;
 
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    purge)
 
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        shred --remove /etc/keys/mandos/seckey.txt \
 
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            /etc/keys/mandos/tls-privkey.pem 2>/dev/null || :
 
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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 \
 
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            /etc/keys/mandos/tls-privkey.pem \
 
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            /etc/keys/mandos/tls-pubkey.pem \
 
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            /etc/keys/mandos/dhparams.pem 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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        exit 1
 
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        ;;
 
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esac
 
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#DEBHELPER#
 
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exit 0