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path: root/tasks/openvpn_simple_smb/task.py
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# SPDX-License-Identifier: AGPL-3.0-or-later

# kpov_util should be imported by add_assignment.py

instructions = {
    'si': '''\
<p>
Postavi dva navidezna računalnika: <em>SimpleArbiter</em> in <em>VPNClient1</em>. Poskrbite, da bosta povezana med seboj in v internet. Na <em>VPNClient1</em> namestite OpenVPN in program za nadzor nad virtualnimi napravami (s katerim kreirate napravo <code>tap</code>).

<p>
Na strežniku <em>SimpleArbiter</em> že teče strežnik in uporablja skrivnost, ki jo najdete tudi na <em>VPNClient1</em> v domačem imeniku uporabnika <code>student</code>. Na <em>VPNClient1</em> vzpostavite VPN tako, da napišete primerno datoteko z nastavitvami. Računalniku <em>VPNClient1</em> na navideznem lokalnem omrežju nastavite naslov
<code>{{IP_VPNClient1}}</code>.

<p>
Nato poskrbite, da bo na <em>VPNClient1</em> na navideznem omrežju prek NFS omogočen
dostop do imenika <code>/home/test/{{DIRNAME}}</code>. V ta imenik skopirajte datoteke, ki so prek SMB dostopne na <em>SimpleArbiter</em>.
''',
	'en': '''\
<p>
Setup two virtual machines: <em>SimpleArbiter</em> and <em>VPNClient1</em>. Set the client's network up so that it has access to the internal network and the internet. On <em>VPNClient1</em>, install OpenVPN and a program for supervising virtual devices 
(which you will use to create a <code>tap</code> device). On the VPN, set the IP for 
<em>VPNClient1</em> to <code>{{IP_VPNClient1}}</code>.

<p>
An OpenVPN server is already running on <em>SimpleArbiter</em>. Use the secret 
available on <em>VPNClient1</em> in the home directory of user <code>student</code> to connect to the VPN server on <em>SimpleArbiter</em>. To do that, you will have to write your
own OpenVPN configuration file.

<p>
After you have set up the VPN, make the directory <code>/home/test/{{DIRNAME}}</code> on <em>VPNClient1</em> available over NFS from <em>SimpleArbiter</em> over
your VPN. Copy files that are available from <em>SimpleArbiter</em> over SMB to <code>/home/test/{{DIRNAME}}</code>.
'''
}

computers = {
    'SimpleArbiter': {
        'disks': [
            {
                'name': 'simpleArbiterDhcpGWVPN',
            },
        ],
        'network_interfaces': [
            {
                'network': 'test-net'
            },
            {
                'network': 'net1'
            }
        ],
        'flavor': 'm1.tiny',
        'config_drive': False
    },
    'VPNClient1': {
        'disks': [
            {   'name': 'student-VPNClient1',
            },
        ],
        'network_interfaces': [
            {
                'network': 'net1'
            }
        ],
        'flavor': 'm1.tiny',
        'config_drive': False
    },
}

networks = {
    'test-net': {
        'public': True
    },
    # Used for the VPN tunnel
    'net1': {
        'public': False
    }
}

#Tukaj sem generiral tri parametre, prosil bi če se upoštevajo pri Tasku. 
params_meta = {
    'IP_SimpleArbiterVPN': {'descriptions':{'si':'IP za SimpleArbiter na VPN'}, 'w': False, 'public': True, 'type': 'IP', 'generated': True}, 
    'IP_VPNClient1': {'descriptions':{'si':'IP klienta na VPN'}, 'w': False, 'public': True, 'type': 'IP', 'generated': True},
    'IP_LANClient1': {'descriptions':{'si':'IP klienta na LAN'}, 'w': True, 'public': True, 'type': 'IP', 'generated': False},
    'DIRNAME': {'descriptions':{'si':'Imenik, dostopen prek NFS'}, 'w': False, 'public': True, 'type': 'IP', 'generated': True},
    'secret_random_seed': {'descriptions':{'si':'Seme za skrivnost'}, 'w': False, 'public': False, 'type': None, 'generated': True},
}

def task(IP_SimpleArbiterVPN, IP_VPNClient1, IP_LANClient1, DIRNAME):
    import collections
    from pexpect import pxssh    # Used to set up an SSH connection to a remote machine
    import pexpect  # Allows the script to spawn a child application and control it as if a human were typing commands

    # The necessary things we need to check if the task was performed correctly
    results = collections.defaultdict(str)
    
    # VPNClient1
    sC1 = pxssh.pxssh(encoding='utf-8')
    sC1.login(IP_LANClient1, 'student', 'vaje')
    
    # sA
    results['SimpleArbiter_ifconfig'] = pexpect.run(
        'ifconfig -a', encoding='utf-8', env={'PATH': '/bin:/sbin'})
    results['SimpleArbiter_route'] = pexpect.run(
        'route -n', encoding='utf-8', env={'PATH': '/bin:/sbin'})
    
    # Pings each of the clients
    # 10.8.0.6 and 10.8.0.10 are the first two default addresses distributed by OpenVPN
    # Will output everything ping outputs (set to ping 3 times)
    results['SimpleArbiter_ping_C1'] = pexpect.run(
        'ping -c 3 {}'.format(IP_VPNClient1), encoding='utf-8')
    results['SimpleArbiter_traceroute'] = pexpect.run(
        'traceroute {}'.format(IP_VPNClient1), encoding='utf-8')
    sC1.sendline('cat /etc/exports')
    sC1.prompt()
    output = sC1.before
    results['VPNClient1_nfs_access_control_list'] = output
    results['SimpleArbiter_mount'] = pexpect.run(
        'sudo mount {}:/home/test/{} /mnt'.format(IP_VPNClient1, DIRNAME), encoding='utf-8')
    results['SimpleArbiter_mount_result'] = pexpect.run(
        'sudo mount', encoding='utf-8')
    results['SimpleArbiter_ls'] = pexpect.run(
        'ls /mnt', encoding='utf-8')
    pexpect.run(
        'sudo umount /mnt', encoding='utf-8')

    # Ping the VPN server
    sC1.sendline('ping -c 3 {0}'.format( IP_SimpleArbiterVPN ))
    sC1.prompt()
    results['VPNClient1_ping_VPN_server'] = sC1.before

    sC1.sendline('/sbin/ifconfig -a')
    sC1.prompt()
    results['VPNClient1_ifconfig'] = sC1.before
 
    sC1.sendline('ps xa')
    sC1.prompt()
    results['VPNClient1_ps'] = sC1.before
    sC1.logout()

    return results

def gen_params(user_id, params_meta):
    params = dict()
    #Tukaj sem generiral te tri parametre (ime skupne skrivnosti je heidi )
    #(ime imenika kjer naj bo shranjena skupna skrivnost naj bo openvpn)
    #(HASH bo naključno generiran niz iz user_id s katerim se bo preverjalo plagiatorstvo)
    import random
    r = random.Random(user_id)
    net = kpov_util.IPv4_subnet_gen(r, '10.168.0.0/16', 24)
    params['IP_VPNClient1'], params['IP_SimpleArbiterVPN'] = kpov_util.IPv4_addr_gen(r, net, 2)
    params['DIRNAME'] = kpov_util.fname_gen(r, extension=False)
    params['secret_random_seed']=str(r.random())
    return params


def task_check(results, params):
    import re
    score = 0
    hints = [] 

    IP_SA = params['IP_SimpleArbiterVPN'].replace('.', '\.')
    IP_C1 = params['IP_VPNClient1'].replace('.', '\.')
    rs = r"tap0: flags=.* mtu 1500\r\n +inet {}".format(IP_SA)
    if re.search(rs,
            results['SimpleArbiter_ifconfig']):
        score += 1
    else:
        hints.append("ifconfig on SimpleArbiter not OK")
    
    if re.search(
            "PING.*\r\n64 bytes from {}: icmp_seq=[0-9]+ ttl=64 time=[0-9.]* ms".format(IP_C1),
            results['SimpleArbiter_ping_C1']):
        score += 1
    else:
        hints.append("ping from server not OK")
    rs = "1 +{0} \({0}\)".format(IP_C1)
    if re.search(rs, results['SimpleArbiter_traceroute']):
        score += 1
    else:
        hints.append("traceroute not OK")
    if results['VPNClient1_nfs_access_control_list'].find(
        '/home/test/' + params['DIRNAME'] + ' ') >= 0:
        score += 1
    if results['SimpleArbiter_mount_result'].find(
            '{}:/home/test/{} on /mnt type nfs'.format(
            params['IP_VPNClient1'], params['DIRNAME'])):
        score += 1
    else:
        hints.append("mount not OK")

    # get r into the correct state
    r = random.Random(params['secret_random_seed'])
    s = "\n".join(["".join([r.choice("0123456789abcdef") for i in range(32)])
        for i in range(16)])
    keyfile = kpov_util.fname_gen(r, extension=False)

    # now check the filenames
    fnames_ok = True
    for i in range(3):
        fname = kpov_util.fname_gen(r, False)
        foo = kpov_util.fortune(r, 4096)
        pos = results['SimpleArbiter_ls'].find(fname + '.txt')
        fnames_ok = fnames_ok and pos >= 0
    if fnames_ok:
        score += 2
    else:
        hints.append("shared filenames not OK:")

    # Ping the VPN server
    if re.search(
            "PING.*\r\n64 bytes from {}: icmp_seq=[0-9]+ ttl=64 time=[0-9.]* ms".format(IP_SA), 
            results['VPNClient1_ping_VPN_server']):
        score += 1
    else:
        hints.append("ping from client not OK")

    rs = r"tap0: flags=.* mtu 1500\r\n +inet {}".format(IP_C1)
    if re.search(rs, results['VPNClient1_ifconfig']):
        score += 1
    else:
        hints.append("ifconfig on VPNClient1 not OK")
 
    if results['VPNClient1_ps'].find('openvpn') > 0:
        score += 1
    else:
        hints.append("openvpn not found running on VPNClient")
    return score, hints

def prepare_disks(templates, task_params, global_params):
    #guestmount -a d -m /dev/VG/LV -m /dev/sda1:/boot --ro /mnt
    #asistent je pocasnela :) 
    import random
    r = random.Random(task_params['secret_random_seed'])
    s = "\n".join([
        "".join([r.choice("0123456789abcdef") for i in range(32)])
        for i in range(16)])
    s = """#
# 2048 bit OpenVPN static key
#
-----BEGIN OpenVPN Static key V1-----
{}
-----END OpenVPN Static key V1-----
""".format(s)
    keyfile = kpov_util.fname_gen(r, extension=False) + ".key"
    templates['simpleArbiterDhcpGWVPN'].write("/etc/openvpn/secret.key", s)
    netaddr_s = """auto tap0
iface tap0 inet static
    openvpn server
    pre-up tunctl -t tap0
    address {}
    netmask 255.255.255.0
""".format(task_params['IP_SimpleArbiterVPN'])
    templates['simpleArbiterDhcpGWVPN'].write_append("/etc/network/interfaces", netaddr_s) 
    for i in range(3):
        fname = kpov_util.fname_gen(r, False)
        templates['simpleArbiterDhcpGWVPN'].write(
            "/srv/smb/" + fname + '.txt',
            kpov_util.fortune(r, 4096))
    write_default_config(templates['simpleArbiterDhcpGWVPN'], global_params)
    templates['student-VPNClient1'].write("/home/student/" + keyfile, s)
    # uid, gid (student = )
    templates['student-VPNClient1'].chown(1000, 1000, "/home/student/" + keyfile) 

    write_default_config(templates['simpleArbiterDhcpGWVPN'], global_params)