From 8268fed28c978cc7c82c301b677c87bf31f05ca0 Mon Sep 17 00:00:00 2001
From: nemunaire <nemunaire@nemunai.re>
Date: Tue, 20 Feb 2018 13:04:37 +0100
Subject: [PATCH] Make token generator script

---
 challenge/Dockerfile |  2 +
 challenge/bin/adlin  | 93 ++++++++++++++++++++++++++++++++++++++++++++
 subject/adlin.6.md   | 38 +++++++++---------
 3 files changed, 113 insertions(+), 20 deletions(-)
 create mode 100755 challenge/bin/adlin

diff --git a/challenge/Dockerfile b/challenge/Dockerfile
index 2324ea8..a10bf6c 100644
--- a/challenge/Dockerfile
+++ b/challenge/Dockerfile
@@ -57,5 +57,7 @@ FROM scratch
 
 COPY --from=mirror /out/ /
 COPY init /init
+COPY bin/ /bin/
 COPY etc/ /etc/
 COPY lib/ /lib/
+COPY sbin/ /sbin/
diff --git a/challenge/bin/adlin b/challenge/bin/adlin
new file mode 100755
index 0000000..d1ffa00
--- /dev/null
+++ b/challenge/bin/adlin
@@ -0,0 +1,93 @@
+#!/bin/sh
+
+# FUNCTIONS ###########################################################
+
+# script usage
+usage() {
+    >&2 cat <<EOF
+ADLIN token generator
+EOF
+}
+
+# token generator
+token_generator() {
+    {
+	echo -n ${PKEY}
+	for d
+	do
+	    echo -n :${d}
+	done
+    } | b2sum | cut -d ' ' -f 1
+}
+
+# JSON token format helper
+token_format() {
+    local TID=$1
+    local TOKEN=$2
+    shift 2
+
+    [ $# -gt 0 ] && {
+	local DATA=',
+    "data": [';
+	for d; do
+	    [ -z "$Z" ] && Z=1 || DATA="$DATA, "
+	    DATA="$DATA\"$d\""
+	done
+	DATA="$DATA]"
+    }
+
+    >&2 cat <<EOF
+{
+    "login": "${ULGN}",
+    "challenge": ${TID},
+    "token": "${TOKEN}"${DATA}
+}
+EOF
+}
+
+# /proc/cmdline parser (from Gentoo Wiki)
+cmdline() {
+    local value
+    value=" $(cat /proc/cmdline) "
+    value="${value##* $1=}"
+    value="${value%% *}"
+    [ "$value" != "" ] && echo "$value"
+}
+
+
+# GLOBAL VARIABLES ####################################################
+
+ULGN=$(cmdline adlin.login)
+PKEY=$(cmdline adlin.key)
+
+
+# MAIN ################################################################
+
+[ $# -lt 1 ] && { usage; exit 1; }
+
+case "$1" in
+    token1|token2)
+	HDATA=42
+	;;
+    token3|token6)
+	DATA=$(date +%s%N)
+    ;;
+    token4)
+	echo "$1 is not here! Perhaps it has been accidentally deleted?" >&2
+	exit 2
+    ;;
+    token5)
+	HDATA=$(dig +short +time=1 +tries=0 adlin.nemunai.re $2 | sed 's/"//g') || {
+	    echo "Try again! Your resolver settings seems not good :(" >&2
+	    exit 3
+	}
+	echo $HDATA | grep "not here" 2> /dev/null && exit 3
+    ;;
+    *)
+	echo "Invalid argument: $1" >&2
+	usage
+	exit 1
+	;;
+esac
+
+token_format "${1#token}" "$(token_generator ${1#token} ${HDATA} ${DATA})" ${DATA}
diff --git a/subject/adlin.6.md b/subject/adlin.6.md
index 81f4c37..e173cde 100644
--- a/subject/adlin.6.md
+++ b/subject/adlin.6.md
@@ -5,8 +5,6 @@ header: ADvanced LINux administration
 footer: EPITA SRS 2019
 author: Écrit par Pierre-Olivier *nemunaire* Mercier <**nemunaire+adlin@nemunai.re**>
 date: 2018-02-21
-hyphenate: true
-pandoc-version: true
 ...
 
 # NOM
@@ -35,61 +33,61 @@ Outrepasser la phase de connexion et devenir **root** sur le système.
 
 ## STAGE 1
 
-**adlin token1 | curl -d @- https://172.23.0.1/challenge1**
+**adlin token1 | curl -d @- http://172.23.0.1/challenge**
 
 Voir aussi: **modprobe**(8), **fbi**(1), **ip**(8), **ip-link**(8), **ip-address**(8)
 
 
 ## STAGE 2
 
-**adlin token2 | curl -d @- https://172.23.200.1/challenge2**
+**adlin token2 | curl -d @- http://172.23.200.1/challenge**
 
 Voir aussi: **ip-route**(8), **crontab**(1)
 
 
-## STAGE 3 (bonus)
+## STAGE 3
 
-**cat token3 | curl -d @- https://172.23.200.1/challenge3**
-
-Voir aussi: **mount**(8)
-
-
-## STAGE 4
-
-**token4 | curl -d @- https://172.23.200.1/challenge4**
+**adlin token3 | curl -d @- https://172.23.200.1/challenge**
 
 Voir aussi: **ntpd**(1)
 
 
-## STAGE 4
+## STAGE 4 (bonus)
 
-**dig** *token4* **| curl -d @- https://172.23.200.1/challenge4**
+**cat token4 | curl -d @- https://172.23.200.1/challenge**
 
-Voir aussi: **resolv.conf**(5), **dig**(1)
+Voir aussi: **mount**(8)
 
 
 ## STAGE 5
 
-**adlin toke5 | curl -d @- https://adlin.nemunai.re/challenge5**
+**dig** *token5* **| curl -d @- https://172.23.200.1/challenge**
+
+Voir aussi: **resolv.conf**(5), **dig**(1)
+
+
+## STAGE 6
+
+**adlin token6 | curl -d @- https://adlin.nemunai.re/challenge**
 
 Voir aussi: **ip-link**(8), **udhcpc**(1), **traceroute**(8), **tcpdump**(1), **sysctl**(8)
 
 
-## STAGE 6
+## STAGE 7
 
 **mail** [*OPTIONS*] **adlin@nemunai.re**
 
 Voir aussi: **dig**(1), **mail**(1)
 
 
-## STAGE 7
+## STAGE 8
 
 **cat ~/.ssh/***id_ssh* **| curl -d @- https://adlin.nemunai.re/sshkey**
 
 Voir aussi: **ssh-keygen**(1)
 
 
-## STAGE 8
+## STAGE 9
 
 **ssh -p** *23000* **root@adlin.nemunai.re**