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Viewing changes to dracut-module/cmdline-mandos.sh

  • Committer: Teddy Hogeborn
  • Date: 2024-11-17 16:53:00 UTC
  • mto: This revision was merged to the branch mainline in revision 412.
  • 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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Lines of Context:
dracut-module/cmdline-mandos.sh
 
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#!/bin/sh
 
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#
 
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# This file should be present in the root file system directory
 
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# /usr/lib/dracut/modules.d/90mandos.  When dracut creates the
 
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# initramfs image, dracut will run the "module-setup.sh" file in the
 
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# same directory, which (when *not* using the "systemd" dracut module)
 
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# will copy this file ("cmdline-mandos.sh") into the initramfs as
 
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# "/lib/dracut/hooks/cmdline/20-cmdline-mandos.sh".
 
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# 
 
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# Despite the above #!/bin/sh line and the executable flag, this file
 
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# is not executed; this file is sourced by the /init script in the
 
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# initramfs image created by dracut.
 
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if getargbool 1 mandos && [ -e /lib/dracut-crypt-lib.sh ]; then
 
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    cat >> /lib/dracut-crypt-lib.sh <<- "EOF"
 
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        ask_for_password(){
 
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            local cmd; local prompt; local tries=3
 
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            local ply_cmd; local ply_prompt; local ply_tries=3
 
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            local tty_cmd; local tty_prompt; local tty_tries=3
 
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            local ret
 
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            while [ $# -gt 0 ]; do
 
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                case "$1" in
 
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                    --cmd) ply_cmd="$2"; tty_cmd="$2"; shift;;
 
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                    --ply-cmd) ply_cmd="$2"; shift;;
 
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                    --tty-cmd) tty_cmd="$2"; shift;;
 
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                    --prompt) ply_prompt="$2"; tty_prompt="$2"; shift;;
 
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                    --ply-prompt) ply_prompt="$2"; shift;;
 
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                    --tty-prompt) tty_prompt="$2"; shift;;
 
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                    --tries) ply_tries="$2"; tty_tries="$2"; shift;;
 
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                    --ply-tries) ply_tries="$2"; shift;;
 
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                    --tty-tries) tty_tries="$2"; shift;;
 
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                    --tty-echo-off) tty_echo_off=yes;;
 
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                    -*) :;;
 
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                esac
 
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                shift
 
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            done
 
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            if [ -z "$ply_cmd" ]; then
 
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                ply_cmd="$tty_cmd"
 
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            fi
 
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            # Extract device and luksname from $ply_cmd
 
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            set -- $ply_cmd
 
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            shift
 
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            for arg in "$@"; do
 
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                case "$arg" in
 
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                    -*) :;;
 
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                    *)
 
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                        if [ -z "$device" ]; then
 
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                            device="$arg"
 
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                        else
 
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                            luksname="$arg"
 
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                            break
 
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                        fi
 
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                        ;;
 
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                esac
 
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            done
 
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            { flock -s 9;
 
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              if [ -z "$ply_prompt" ]; then
 
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                  if [ -z "$tty_prompt" ]; then
 
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
 
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                  else
 
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --options-for=password-prompt:--prompt="${tty_prompt}" --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
 
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                  fi
 
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              else
 
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                  if [ -z "$tty_prompt" ]; then
 
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --options-for=plymouth:--prompt="${ply_prompt}" --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
 
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                  else
 
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                      CRYPTTAB_SOURCE="$device" cryptsource="$device" CRYPTTAB_NAME="$luksname" crypttarget="$luksname" /lib/mandos/plugin-runner --options-for=password-prompt:--prompt="${tty_prompt}" --options-for=plymouth:--prompt="${ply_prompt}" --config-file=/etc/mandos/plugin-runner.conf | $ply_cmd
 
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                  fi
 
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              fi
 
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            } 9>/.console_lock
 
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        }
 
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        EOF
 
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fi