commit a490f1490b0a717a5fb1ffe1f34d76d70fe0f4f0
Author: Hipstercat <tasty@hipstercat.fr>
Date:   Mon Mar 8 23:04:56 2021 +0100

    init

diff --git a/helper/remote_cmd.sh b/helper/remote_cmd.sh
new file mode 100755
index 0000000..b6eef4c
--- /dev/null
+++ b/helper/remote_cmd.sh
@@ -0,0 +1,29 @@
+#!/bin/bash
+# ./remote_cmd.sh toujea "sudo -u tasty bash -c \"export DISPLAY=:0 && export XAUTHORITY=/home/tasty/.Xauthority && export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1000/bus && zenity --notification --text \\\"LIS67: 
+# Jean vient de se connecter\\\"\""
+
+user=$1
+if [[ -z $user ]]; then
+	exit 1
+fi
+
+shift
+
+echo "Looking for port..."
+port=$(ssh root@lis67_support /root/get_port.sh $user)
+if [[ -z $port ]]; then
+	echo "could not find port"
+	exit 1
+fi
+
+echo "Binding remote port $port to local 8888"
+ssh -N -L8888:127.0.0.1:$port root@lis67_support &
+pid=$!
+sleep 2
+
+echo "Executing command on host"
+echo "$@"
+
+ssh -p 8888 lis67_support@localhost "$@"
+
+kill $pid
diff --git a/support.sh b/support.sh
new file mode 100755
index 0000000..88b8c31
--- /dev/null
+++ b/support.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+SPATH=$(cd $(dirname $0) && pwd)
+pkexec env DISPLAY=$DISPLAY XAUTHORITY=$XAUTHORITY HOME=$HOME USER=$USER CWD=$CWD "$SPATH/support/run.sh"
diff --git a/support/run.sh b/support/run.sh
new file mode 100755
index 0000000..257c54a
--- /dev/null
+++ b/support/run.sh
@@ -0,0 +1,174 @@
+#!/bin/bash
+
+SUPPORT_KEY="x2Dmw3hLRDPQa1sg59fAx2Dmw3hLRDPQa1sg59fA"
+SUPPORT_URL="http://192.168.50.2:5000"
+SUPPORT_SSHSERVER="192.168.50.2"
+
+function error() {
+	id="$1"
+	echo $id
+	zenity --error --title="Erreur" --text="Une erreur s'est produite... Mais rien de grave !\nVous pouvez envoyez un mail à contact@lis67.eu en précisant l'erreur suivante : $id\n\nVous pouvez aussi essayer de quitter le support en relançant le logiciel, puis recommencer en le relançant à nouveau." --no-wrap
+	exit 1
+}
+
+if [[ $EUID -ne 0 ]]; then
+	error "lis67.uid.ne.zero"
+fi
+
+########################### UNINSTALL
+if id lis67_support > /dev/null; then
+	if zenity --question --title="LIS67 support à distance" --text="Voulez-vous désactiver le dépannage à distance ?" --no-wrap; then
+		# uninstall packets
+		(
+			export DEBIAN_FRONTEND=noninteractive
+			# apt-get remove -yq autossh openssh-server
+			echo "100"
+		) | zenity --progress --title="LIS67 support à distance" --text="Désinstallation des paquets..." --auto-close --pulsate
+
+		# grap pubkey
+		pubkey=$(sudo -u lis67_support /bin/bash -c "cat /home/lis67_support/.ssh/id_rsa.pub")
+
+		# remove service and kill process
+		service lis67_autossh stop
+		pkill -9 autossh
+		service ssh stop
+		rm /etc/systemd/system/lis67_autossh.service
+
+		# delete user
+		userdel -r -f lis67_support
+
+		# inform webapp
+		curl -s -X DELETE -H "Content-Type: application/json" "$SUPPORT_URL/end" -d "{\"key\": \"${SUPPORT_KEY}\", \"pubKey\": \"${pubkey}\"}"
+
+		# done!
+		zenity --info --title="LIS67 support à distance" --text="Le support a été désactivé. Plus aucune personne au LIS67 ne pourra accéder à votre ordinateur tant que vous ne réactiverez pas le support." --no-wrap
+		exit 0
+	else
+		exit 0
+	fi
+fi
+
+########################### INSTALL
+if zenity --question --title="LIS67 support à distance" --text="Voulez-vous activer le support dépannage à distance?\nSeules les personnes habilitées au LIS pourront accéder à votre ordinateur. Envoyer un mail à contact@lis67.eu pour savoir qui est autorisé.\n\nPour mettre fin au support, relancez ce logiciel." --no-wrap
+then
+	# install packages
+	(
+		export DEBIAN_FRONTEND=noninteractive
+		apt-get install -yq jq autossh openssh-server > /dev/null 2>&1
+		echo "100"
+	) | zenity --progress --title="LIS67 support à distance" --text="Installation des paquets..." --auto-close --pulsate
+
+	# loop until the user understands what we expect...
+	while [[ -z $nom || -z $prenom || ${#nom} -le 3 || ${#prenom} -le 3 ]]; do
+		# ask nom et prenom
+		form_result=$(zenity --forms --title="Informations" --separator=";" --text="Entrez vos informations pour le support" --add-entry="Votre nom:" --add-entry="Votre prénom:")
+
+		if [[ $? -ne 0 ]]; then
+			exit 1
+		fi
+
+		IFS=';' read -ra FORM_ARR <<< "$form_result"
+		nom="${FORM_ARR[0]}"
+		prenom="${FORM_ARR[1]}"
+
+		if [[ -z $nom || -z $prenom ]]; then
+			zenity --error --title="Erreur" --text="Veuillez rentrer votre nom et prénom." --no-wrap
+		elif [[ ${#nom} -le 3 || ${#prenom} -le 3 ]]; then
+			zenity --error --title="Erreur" --text="Veuillez rentrer un nom et prénom un peu plus grand..." --no-wrap
+		fi
+	done
+
+	# création du user
+	adduser --system --shell /bin/bash --gecos 'LIS67 support user' --group --disabled-password --home /home/lis67_support lis67_support
+	if [[ $? -ne 0 ]]; then
+		error "lis67.adduser"
+	fi
+
+	# add to sudo group
+	echo "lis67_support ALL=(ALL) NOPASSWD: ALL" > /etc/sudoers.d/lis67_support
+
+	# generate ssh key
+	if [[ -f /home/lis67_support/.ssh/id_rsa ]]; then
+		rm /home/lis67_support/.ssh/id_rsa /home/lis67_support/.ssh/id_rsa > /dev/null 2>&1
+	fi
+	sudo -u lis67_support /bin/bash -c "cd /home/lis67_support && ssh-keygen -q -t rsa -f /home/lis67_support/.ssh/id_rsa -N \"\""
+	if [[ $? -ne 0 ]]; then
+		error "lis67.ssh_keygen"
+	fi
+
+	# get ssh_key value
+	pubkey=$(sudo -u lis67_support /bin/bash -c "cat /home/lis67_support/.ssh/id_rsa.pub")
+	if [[ $? -ne 0 || -z $pubkey ]]; then
+		error "lis67.pubkey_read"
+	fi
+
+	# push pubkey on server
+	server_ret=$(curl -X POST -H "Content-Type: application/json" "$SUPPORT_URL/request" -d "{\"key\": \"${SUPPORT_KEY}\", \"pubKey\": \"${pubkey}\", \"nom\": \"${nom}\", \"prenom\": \"${prenom}\"}")
+	if [[ $? -ne 0 ]]; then error "lis67.srv_err.curl"; fi
+	if [[ -z $server_ret ]]; then error "lis67.srv_err.empty_resp"; fi
+
+	status=$(echo "$server_ret" | jq .status -r)
+	if [[ $? -ne 0 ]]; then error "lis67.jqstatus.ret"; fi
+	if [[ "$status" != "ok" ]]; then error "lis67.status.notok"; fi
+
+	lis67_pubkeys=$(echo "$server_ret" | jq .pubkeys -r)
+	if [[ $? -ne 0 ]]; then error "lis67.jqpubkeys.ret"; fi
+	if [[ -z $lis67_pubkeys ]]; then error "lis67.pubkeys.empty"; fi
+
+	remote_port=$(echo "$server_ret" | jq .remoteport -r)
+	if [[ $? -ne 0 ]]; then error "lis67.jqremoteport.ret"; fi
+	if [[ -z $remote_port ]]; then error "lis67.remoteport.empty"; fi
+
+	remote_user=$(echo "$server_ret" | jq .remoteuser -r)
+	if [[ $? -ne 0 ]]; then error "lis67.jqremoteuser.ret"; fi
+	if [[ -z $remote_user ]]; then error "lis67.remoteuser.empty"; fi
+
+	# write lis67 keys to authorized
+	echo -e "$lis67_pubkeys" > /home/lis67_support/.ssh/authorized_keys
+
+	# start autossh service
+	cat << EOF > /etc/systemd/system/lis67_autossh.service
+[Unit]
+Description=Reverse SSH tunnel
+After=network-online.target
+
+[Service]
+ExecStart=/home/lis67_support/autossh.sh
+TimeoutSec=infinity
+
+[Install]
+WantedBy=multi-user.target
+EOF
+
+	cat << EOF > /home/lis67_support/autossh.sh
+#!/bin/bash
+while [ 1 ]; do
+        /usr/bin/autossh -i /home/lis67_support/.ssh/id_rsa -p 22967 -o StrictHostKeyChecking=no -NR $remote_port:localhost:22 $remote_user@$SUPPORT_SSHSERVER
+done
+EOF
+
+	cat << EOF > /home/lis67_support/as_user.sh
+#!/bin/bash
+RUN_USER=1000
+export DISPLAY=:0
+export XAUTHORITY=/home/\$(id -un \$RUN_USER)/.Xauthority
+export DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/\$RUN_USER/bus
+sudo -u \$(id -un \$RUN_USER) -E \$@
+EOF
+	chmod +x /home/lis67_support/as_user.sh
+
+	cat << EOF > /home/lis67_support/welcome.sh
+#!/bin/bash
+/home/lis67_support/as_user.sh zenity --notification --text "LIS67 support: votre ordinateur est pris en charge à distance."
+EOF
+	chmod +x /home/lis67_support/as_user.sh
+
+	service ssh start
+
+	chmod +x /home/lis67_support/autossh.sh
+	systemctl enable lis67_autossh
+	service lis67_autossh start
+
+	# done!
+	zenity --info --title="Succès" --text="Support activé !" --no-wrap
+fi
diff --git a/webapp/get_port.sh b/webapp/get_port.sh
new file mode 100644
index 0000000..2a3d0de
--- /dev/null
+++ b/webapp/get_port.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+user=$1
+if [[ -z $user ]]; then exit 1; fi
+for p in $(netstat -tulpn | grep "sshd: $user" | grep -v tcp6 | awk -F" " '{print $4}' | cut -d':' -f 2); do
+	timeout 2 ssh -o BatchMode=yes  -o StrictHostKeyChecking=no -o ConnectTimeout=2 -i id_rsa -p $p lis67_support@localhost "exit 0" > /dev/null && echo $p && exit 0
+done
diff --git a/webapp/web.py b/webapp/web.py
new file mode 100644
index 0000000..d22fb5c
--- /dev/null
+++ b/webapp/web.py
@@ -0,0 +1,127 @@
+from flask import Flask, request, abort, jsonify
+from flask_sqlalchemy import SQLAlchemy
+import subprocess
+import random
+import os
+
+
+SUPPORT_KEY = "x2Dmw3hLRDPQa1sg59fAx2Dmw3hLRDPQa1sg59fA"
+PUBKEYS = [
+    "ssh-rsa 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 jean@toulza.fr"
+]
+
+app = Flask(__name__)
+app.config['SECRET_KEY'] = '9OLWxND4o83j4K4iuopO'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///db.sqlite'
+app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
+db = SQLAlchemy(app)
+
+
+@app.route('/request', methods=["POST"])
+def request_post():
+    j = request.json
+    if not j or j["key"] != SUPPORT_KEY:
+        abort(403)
+    if "pubKey" in j and "nom" in j and "prenom" in j and len(j["nom"]) > 3 and len(j["prenom"]) > 3:
+        nom = j["nom"]
+        prenom = j["prenom"]
+        pubkey = j["pubKey"]
+        ip = request.remote_addr
+        localuser, randomport = create_user(nom, prenom, pubkey)
+        print("IP: %s, localuser=%s randomport=%s" % (ip, localuser, randomport))
+        return jsonify({"status": "ok", "pubkeys": "\n".join(PUBKEYS), "remoteport": randomport, "remoteuser": localuser})
+    else:
+        abort(403)
+
+
+@app.route('/end', methods=["DELETE"])
+def end_delete():
+    j = request.json
+    if not j or j["key"] != SUPPORT_KEY:
+        print("no json or support key")
+        print(request.data)
+        print(request.form)
+        abort(403)
+    if "pubKey" in j:
+        localuser = find_localuser_by_pubkey(j["pubKey"])
+        if localuser:
+            delete_localuser(localuser)
+            print("deleted %s" % localuser)
+        return jsonify({"status": "ok"})
+    else:
+        print("no pubkey")
+        abort(403)
+
+
+def find_localuser_by_pubkey(pubkey):
+    for user in get_localusers():
+        if os.path.exists("/home/%s/.ssh/authorized_keys" % user):
+            with open("/home/%s/.ssh/authorized_keys" % user) as fp:
+                content = fp.read()
+            if pubkey in content:
+                return user
+    return None
+
+
+def exec_cmd(cmd):
+    p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
+    retcode = p.wait()
+    stdout, stderr = p.communicate()
+    stdout = stdout.decode("utf8").strip()
+    return retcode, stdout
+
+
+def get_localusers():
+    retcode, out = exec_cmd("awk -F: '{ print $1 }' /etc/passwd")
+    users = out.split("\n")
+    return users
+
+
+def localuser_exists(username):
+    return username in get_localusers()
+
+
+def create_user(nom, prenom, pubkey):
+    username = (nom[0:3] + prenom[0:3]).lower()
+    while localuser_exists(username):
+        username = username + str(random.randint(1, 99))
+
+    print("Creating user %s..." % username)
+
+    retcode, out = exec_cmd("adduser \
+   --system \
+   --shell /bin/false \
+   --gecos 'LIS67 user account for %s %s' \
+   --group \
+   --disabled-password \
+   --home /home/%s \
+   %s" % (nom, prenom, username, username))
+
+    if retcode != 0:
+        abort(500)
+
+    try:
+        os.mkdir("/home/%s/.ssh" % username)
+    except:
+        pass
+
+    with open("/home/%s/.ssh/authorized_keys" % username, "w") as fp:
+        fp.write(pubkey)
+
+    random_port = find_localport()
+
+    return username, random_port
+
+
+def find_localport():
+    retcode, out = exec_cmd("python -c 'import socket; s=socket.socket(); s.bind((\"\", 0)); print(s.getsockname()[1]); s.close()'")
+    return int(out)
+
+
+def delete_localuser(username):
+    exec_cmd("userdel -r -f %s" % username)
+
+
+if __name__ == "__main__":
+    db.create_all()
+    app.run(host="0.0.0.0")