Make challenge image

.gitignore

@@ -1 +1,4 @@
+challenge-cmdline
+challenge-initrd.img
+challenge-kernel
 tftp/initramfs-login.img

challenge.yml

@@ -0,0 +1,2 @@
+init:
+  - nemunaire/challenge:712906291b27a2b2cde544e9bff4fe443c2058ab-dirty

challenge/Dockerfile

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+FROM alpine AS mirror
+
+RUN mkdir -p /out/etc/apk/ && \
+    cp /etc/apk/repositories /out/etc/apk/ && \
+    cp -r /etc/apk/keys /out/etc/apk/keys
+
+RUN apk add --no-cache \
+    mdocml-apropos
+
+RUN apk add --no-cache --initdb -p /out \
+    alpine-baselayout \
+    beep \
+    busybox \
+    ca-certificates \
+    curl \
+    curl-doc \
+    fbida-fbi \
+    fbida-doc \
+    htop \
+    htop-doc \
+    iproute2-doc \
+    man \
+    musl \
+    openssh-keygen \
+    poppler-utils \
+    ssmtp \
+    testdisk \
+    testdisk-doc \
+    tini \
+    util-linux \
+    util-linux-doc
+
+RUN makewhatis /out/usr/share/man
+
+RUN rm -rf /out/etc/inittab
+
+
+FROM scratch
+
+COPY --from=mirror /out/ /
+COPY init /init
+COPY etc/ /etc/
+COPY lib/ /lib/

challenge/build.yml

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+image: challenge

challenge/etc/issue

@@ -0,0 +1,10 @@
+       .o.             .o8  ooooo         o8o
+      .888.           "888  `888'         `"'
+     .8"888.      .oooo888   888         oooo  ooo. .oo.
+    .8' `888.    d88' `888   888         `888  `888P"Y88b
+   .88ooo8888.   888   888   888          888   888   888
+  .8'     `888.  888   888   888       o  888   888   888
+ o88o     o8888o `Y8bod88P" o888ooooood8 o888o o888o o888o
+
+
+This is \n.pie.epita.net (\s \m) \t

challenge/etc/passwd

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+root:x:0:0:root:/root:/bin/bash
+bin:x:1:1:bin:/bin:/bin/false
+daemon:x:2:2:daemon:/sbin:/bin/false
+adm:x:3:4:adm:/var/adm:/bin/false
+lp:x:4:7:lp:/var/spool/lpd:/bin/false
+sync:x:5:0:sync:/sbin:/bin/sync
+shutdown:x:6:0:shutdown:/sbin:/sbin/shutdown
+halt:x:7:0:halt:/sbin:/sbin/halt
+news:x:9:13:news:/var/spool/news:/bin/false
+uucp:x:10:14:uucp:/var/spool/uucp:/bin/false
+operator:x:11:0:operator:/root:/bin/bash

challenge/etc/periodic/15min/netreboot

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+#!/bin/sh
+
+ping -c 1 192.168.23.1 && \
+    sleep 3 && \
+    reboot -f

challenge/init

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+#!/bin/sh
+
+mount -t proc proc /proc
+mount -t sysfs sysfs /sys
+
+/bin/busybox --install -s
+
+mdev -s
+
+modprobe snd-pcsp
+
+# /proc/cmdline parser (from Gentoo Wiki)
+cmdline() {
+    local value
+    value=" $(cat /proc/cmdline) "
+    value="${value##* $1=}"
+    value="${value%% *}"
+    [ "$value" != "" ] && echo "$value"
+}
+
+# Get some command line options
+USER_LOGIN=$(cmdline adlin.login)
+USER_PKEY=$(cmdline adlin.key)
+
+# Define hostname
+hostname adlin-${USER_LOGIN}
+
+# Launch some TTYs
+for i in `seq 2 4`
+do
+    while true
+    do
+	/usr/bin/setsid /sbin/agetty -l /sbin/fakelogin 38400 "tty${i}" linux
+    done &
+done
+
+# Hide us!
+/bin/rm -f /init /linuxrc
+
+# Randomize time at boot
+/bin/date -s 197001010101 > /dev/null
+/sbin/sysctl -w net.ipv4.ip_default_ttl=4 > /dev/null
+
+# Launch some daemons
+/usr/bin/setsid /usr/sbin/crond > /dev/null &
+
+# Launch requested init
+if grep init= /proc/cmdline > /dev/null 2> /dev/null
+then
+    INIT=$(cmdline init)
+    [ -z "${INIT}" ]
+
+    while true
+    do
+	sleep $((10 + $RANDOM % 49))
+	beep -f 1000 -r 2 -n -r 5 -l 10 --new
+    done &
+
+    exec /usr/bin/setsid sh -c "exec '${INIT}' </dev/tty1 >/dev/tty1 2>&1"
+else
+    while true
+    do
+	/usr/bin/setsid /sbin/agetty -l /sbin/fakelogin 38400 tty1 linux
+    done
+fi

challenge/sbin/fakelogin

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+#!/bin/sh
+
+[ "$2" = "root" ] &&
+    echo "Tip: vous souvenez-vous du mot de passe root ?" ||
+	echo "Tip: cette machine n'est pas reliée au LDAP de l'école."
+
+exec login $@