#!/usr/bin/python import sys import cgi import os import string import subprocess import re import time import cPickle import base64 import sha import hmac import datetime import StringIO import getafsgroups sys.stderr = StringIO.StringIO() sys.path.append('/home/ecprice/.local/lib/python2.5/site-packages') from Cheetah.Template import Template from sipb_xen_database import * import random class MyException(Exception): """Base class for my exceptions""" pass class InvalidInput(MyException): """Exception for user-provided input is invalid but maybe in good faith. This would include setting memory to negative (which might be a typo) but not setting an invalid boot CD (which requires bypassing the select box). """ def __init__(self, err_field, err_value, expl=None): MyException.__init__(self, expl) self.err_field = err_field self.err_value = err_value class CodeError(MyException): """Exception for internal errors or bad faith input.""" pass class Global(object): def __init__(self, user): self.user = user def __get_uptimes(self): if not hasattr(self, '_uptimes'): self._uptimes = getUptimes(Machine.select()) return self._uptimes uptimes = property(__get_uptimes) g = None def helppopup(subj): """Return HTML code for a (?) link to a specified help topic""" return '(?)' global_dict = {} global_dict['helppopup'] = helppopup # ... and stolen from xend/uuid.py def randomUUID(): """Generate a random UUID.""" return [ random.randint(0, 255) for _ in range(0, 16) ] def uuidToString(u): """Turn a numeric UUID to a hyphen-seperated one.""" return "-".join(["%02x" * 4, "%02x" * 2, "%02x" * 2, "%02x" * 2, "%02x" * 6]) % tuple(u) MAX_MEMORY_TOTAL = 512 MAX_MEMORY_SINGLE = 256 MIN_MEMORY_SINGLE = 16 MAX_DISK_TOTAL = 50 MAX_DISK_SINGLE = 50 MIN_DISK_SINGLE = 0.1 MAX_VMS_TOTAL = 10 MAX_VMS_ACTIVE = 4 def getMachinesByOwner(owner): """Return the machines owned by a given owner.""" return Machine.select_by(owner=owner) def maxMemory(user, machine=None): """Return the maximum memory for a machine or a user. If machine is None, return the memory available for a new machine. Else, return the maximum that machine can have. on is a dictionary from machines to booleans, whether a machine is on. If None, it is recomputed. XXX make this global? """ machines = getMachinesByOwner(user.username) active_machines = [x for x in machines if g.uptimes[x]] mem_usage = sum([x.memory for x in active_machines if x != machine]) return min(MAX_MEMORY_SINGLE, MAX_MEMORY_TOTAL-mem_usage) def maxDisk(user, machine=None): machines = getMachinesByOwner(user.username) disk_usage = sum([sum([y.size for y in x.disks]) for x in machines if x != machine]) return min(MAX_DISK_SINGLE, MAX_DISK_TOTAL-disk_usage/1024.) def canAddVm(user): machines = getMachinesByOwner(user.username) active_machines = [x for x in machines if g.uptimes[x]] return (len(machines) < MAX_VMS_TOTAL and len(active_machines) < MAX_VMS_ACTIVE) def haveAccess(user, machine): """Return whether a user has access to a machine""" if user.username == 'moo': return True return getafsgroups.checkLockerOwner(user.username,machine.owner) def error(op, user, fields, err, emsg): """Print an error page when a CodeError occurs""" d = dict(op=op, user=user, errorMessage=str(err), stderr=emsg) return Template(file='error.tmpl', searchList=[d, global_dict]); def invalidInput(op, user, fields, err, emsg): """Print an error page when an InvalidInput exception occurs""" d = dict(op=op, user=user, err_field=err.err_field, err_value=str(err.err_value), stderr=emsg, errorMessage=str(err)) return Template(file='invalid.tmpl', searchList=[d, global_dict]); def validMachineName(name): """Check that name is valid for a machine name""" if not name: return False charset = string.ascii_letters + string.digits + '-_' if name[0] in '-_' or len(name) > 22: return False for x in name: if x not in charset: return False return True def kinit(username = 'tabbott/extra', keytab = '/etc/tabbott.keytab'): """Kinit with a given username and keytab""" p = subprocess.Popen(['kinit', "-k", "-t", keytab, username], stderr=subprocess.PIPE) e = p.wait() if e: raise CodeError("Error %s in kinit: %s" % (e, p.stderr.read())) def checkKinit(): """If we lack tickets, kinit.""" p = subprocess.Popen(['klist', '-s']) if p.wait(): kinit() def remctl(*args, **kws): """Perform a remctl and return the output. kinits if necessary, and outputs errors to stderr. """ checkKinit() p = subprocess.Popen(['remctl', 'black-mesa.mit.edu'] + list(args), stdout=subprocess.PIPE, stderr=subprocess.PIPE) if kws.get('err'): p.wait() return p.stdout.read(), p.stderr.read() if p.wait(): raise CodeError('ERROR on remctl %s: %s' % (args, p.stderr.read())) return p.stdout.read() def lvcreate(machine, disk): """Create a single disk for a machine""" remctl('web', 'lvcreate', machine.name, disk.guest_device_name, str(disk.size)) def makeDisks(machine): """Update the lvm partitions to add a disk.""" for disk in machine.disks: lvcreate(machine, disk) def bootMachine(machine, cdtype): """Boot a machine with a given boot CD. If cdtype is None, give no boot cd. Otherwise, it is the string id of the CD (e.g. 'gutsy_i386') """ if cdtype is not None: remctl('web', 'vmboot', machine.name, cdtype) else: remctl('web', 'vmboot', machine.name) def registerMachine(machine): """Register a machine to be controlled by the web interface""" remctl('web', 'register', machine.name) def unregisterMachine(machine): """Unregister a machine to not be controlled by the web interface""" remctl('web', 'unregister', machine.name) def parseStatus(s): """Parse a status string into nested tuples of strings. s = output of xm list --long """ values = re.split('([()])', s) stack = [[]] for v in values[2:-2]: #remove initial and final '()' if not v: continue v = v.strip() if v == '(': stack.append([]) elif v == ')': if len(stack[-1]) == 1: stack[-1].append('') stack[-2].append(stack[-1]) stack.pop() else: if not v: continue stack[-1].extend(v.split()) return stack[-1] def getUptimes(machines=None): """Return a dictionary mapping machine names to uptime strings""" value_string = remctl('web', 'listvms') lines = value_string.splitlines() d = {} for line in lines: lst = line.split() name, id = lst[:2] uptime = ' '.join(lst[2:]) d[name] = uptime ans = {} for m in machines: ans[m] = d.get(m.name) return ans def statusInfo(machine): """Return the status list for a given machine. Gets and parses xm list --long """ value_string, err_string = remctl('list-long', machine.name, err=True) if 'Unknown command' in err_string: raise CodeError("ERROR in remctl list-long %s is not registered" % (machine.name,)) elif 'does not exist' in err_string: return None elif err_string: raise CodeError("ERROR in remctl list-long %s: %s" % (machine.name, err_string)) status = parseStatus(value_string) return status def hasVnc(status): """Does the machine with a given status list support VNC?""" if status is None: return False for l in status: if l[0] == 'device' and l[1][0] == 'vfb': d = dict(l[1][1:]) return 'location' in d return False def createVm(user, name, memory, disk, is_hvm, cdrom): """Create a VM and put it in the database""" # put stuff in the table transaction = ctx.current.create_transaction() try: if memory > maxMemory(user): raise InvalidInput('memory', memory, "Max %s" % maxMemory(user)) if disk > maxDisk(user) * 1024: raise InvalidInput('disk', disk, "Max %s" % maxDisk(user)) if not canAddVm(user): raise InvalidInput('create', True, 'Unable to create more VMs') res = meta.engine.execute('select nextval(\'"machines_machine_id_seq"\')') id = res.fetchone()[0] machine = Machine() machine.machine_id = id machine.name = name machine.memory = memory machine.owner = user.username machine.contact = user.email machine.uuid = uuidToString(randomUUID()) machine.boot_off_cd = True machine_type = Type.get_by(hvm=is_hvm) machine.type_id = machine_type.type_id ctx.current.save(machine) disk = Disk(machine.machine_id, 'hda', disk) open = NIC.select_by(machine_id=None) if not open: #No IPs left! raise CodeError("No IP addresses left! Contact sipb-xen-dev@mit.edu") nic = open[0] nic.machine_id = machine.machine_id nic.hostname = name ctx.current.save(nic) ctx.current.save(disk) transaction.commit() except: transaction.rollback() raise registerMachine(machine) makeDisks(machine) # tell it to boot with cdrom bootMachine(machine, cdrom) return machine def validMemory(user, memory, machine=None): """Parse and validate limits for memory for a given user and machine.""" try: memory = int(memory) if memory < MIN_MEMORY_SINGLE: raise ValueError except ValueError: raise InvalidInput('memory', memory, "Minimum %s MB" % MIN_MEMORY_SINGLE) if memory > maxMemory(user, machine): raise InvalidInput('memory', memory, 'Maximum %s MB' % maxMemory(user, machine)) return memory def validDisk(user, disk, machine=None): """Parse and validate limits for disk for a given user and machine.""" try: disk = float(disk) if disk > maxDisk(user, machine): raise InvalidInput('disk', disk, "Maximum %s G" % maxDisk(user, machine)) disk = int(disk * 1024) if disk < MIN_DISK_SINGLE * 1024: raise ValueError except ValueError: raise InvalidInput('disk', disk, "Minimum %s GB" % MIN_DISK_SINGLE) return disk def create(user, fields): """Handler for create requests.""" name = fields.getfirst('name') if not validMachineName(name): raise InvalidInput('name', name) name = name.lower() if Machine.get_by(name=name): raise InvalidInput('name', name, "Already exists") memory = fields.getfirst('memory') memory = validMemory(user, memory) disk = fields.getfirst('disk') disk = validDisk(user, disk) vm_type = fields.getfirst('vmtype') if vm_type not in ('hvm', 'paravm'): raise CodeError("Invalid vm type '%s'" % vm_type) is_hvm = (vm_type == 'hvm') cdrom = fields.getfirst('cdrom') if cdrom is not None and not CDROM.get(cdrom): raise CodeError("Invalid cdrom type '%s'" % cdrom) machine = createVm(user, name, memory, disk, is_hvm, cdrom) d = dict(user=user, machine=machine) return Template(file='create.tmpl', searchList=[d, global_dict]); def listVms(user, fields): """Handler for list requests.""" machines = [m for m in Machine.select() if haveAccess(user, m)] on = {} has_vnc = {} on = g.uptimes for m in machines: if not on[m]: has_vnc[m] = 'Off' elif m.type.hvm: has_vnc[m] = True else: has_vnc[m] = "ParaVM"+helppopup("paravm_console") # for m in machines: # status = statusInfo(m) # on[m.name] = status is not None # has_vnc[m.name] = hasVnc(status) max_mem=maxMemory(user) max_disk=maxDisk(user) d = dict(user=user, can_add_vm=canAddVm(user), max_mem=max_mem, max_disk=max_disk, default_mem=max_mem, default_disk=min(4.0, max_disk), machines=machines, has_vnc=has_vnc, uptimes=g.uptimes, cdroms=CDROM.select()) return Template(file='list.tmpl', searchList=[d, global_dict]) def testMachineId(user, machineId, exists=True): """Parse, validate and check authorization for a given machineId. If exists is False, don't check that it exists. """ if machineId is None: raise CodeError("No machine ID specified") try: machineId = int(machineId) except ValueError: raise CodeError("Invalid machine ID '%s'" % machineId) machine = Machine.get(machineId) if exists and machine is None: raise CodeError("No such machine ID '%s'" % machineId) if machine is not None and not haveAccess(user, machine): raise CodeError("No access to machine ID '%s'" % machineId) return machine def vnc(user, fields): """VNC applet page. Note that due to same-domain restrictions, the applet connects to the webserver, which needs to forward those requests to the xen server. The Xen server runs another proxy that (1) authenticates and (2) finds the correct port for the VM. You might want iptables like: -t nat -A PREROUTING -s ! 18.181.0.60 -i eth1 -p tcp -m tcp --dport 10003 -j DNAT --to-destination 18.181.0.60:10003 -t nat -A POSTROUTING -d 18.181.0.60 -o eth1 -p tcp -m tcp --dport 10003 -j SNAT --to-source 18.187.7.142 -A FORWARD -d 18.181.0.60 -i eth1 -o eth1 -p tcp -m tcp --dport 10003 -j ACCEPT Remember to enable iptables! echo 1 > /proc/sys/net/ipv4/ip_forward """ machine = testMachineId(user, fields.getfirst('machine_id')) TOKEN_KEY = "0M6W0U1IXexThi5idy8mnkqPKEq1LtEnlK/pZSn0cDrN" data = {} data["user"] = user.username data["machine"]=machine.name data["expires"]=time.time()+(5*60) pickledData = cPickle.dumps(data) m = hmac.new(TOKEN_KEY, digestmod=sha) m.update(pickledData) token = {'data': pickledData, 'digest': m.digest()} token = cPickle.dumps(token) token = base64.urlsafe_b64encode(token) status = statusInfo(machine) has_vnc = hasVnc(status) d = dict(user=user, on=status, has_vnc=has_vnc, machine=machine, hostname=os.environ.get('SERVER_NAME', 'localhost'), authtoken=token) return Template(file='vnc.tmpl', searchList=[d, global_dict]) def getNicInfo(data_dict, machine): """Helper function for info, get data on nics for a machine. Modifies data_dict to include the relevant data, and returns a list of (key, name) pairs to display "name: data_dict[key]" to the user. """ data_dict['num_nics'] = len(machine.nics) nic_fields_template = [('nic%s_hostname', 'NIC %s hostname'), ('nic%s_mac', 'NIC %s MAC Addr'), ('nic%s_ip', 'NIC %s IP'), ] nic_fields = [] for i in range(len(machine.nics)): nic_fields.extend([(x % i, y % i) for x, y in nic_fields_template]) data_dict['nic%s_hostname' % i] = machine.nics[i].hostname + '.servers.csail.mit.edu' data_dict['nic%s_mac' % i] = machine.nics[i].mac_addr data_dict['nic%s_ip' % i] = machine.nics[i].ip if len(machine.nics) == 1: nic_fields = [(x, y.replace('NIC 0 ', '')) for x, y in nic_fields] return nic_fields def getDiskInfo(data_dict, machine): """Helper function for info, get data on disks for a machine. Modifies data_dict to include the relevant data, and returns a list of (key, name) pairs to display "name: data_dict[key]" to the user. """ data_dict['num_disks'] = len(machine.disks) disk_fields_template = [('%s_size', '%s size')] disk_fields = [] for disk in machine.disks: name = disk.guest_device_name disk_fields.extend([(x % name, y % name) for x, y in disk_fields_template]) data_dict['%s_size' % name] = "%0.1f GB" % (disk.size / 1024.) return disk_fields def deleteVM(machine): """Delete a VM.""" try: remctl('destroy', machine.name) except: pass transaction = ctx.current.create_transaction() delete_disk_pairs = [(machine.name, d.guest_device_name) for d in machine.disks] try: for nic in machine.nics: nic.machine_id = None nic.hostname = None ctx.current.save(nic) for disk in machine.disks: ctx.current.delete(disk) ctx.current.delete(machine) transaction.commit() except: transaction.rollback() raise for mname, dname in delete_disk_pairs: remctl('web', 'lvremove', mname, dname) unregisterMachine(machine) def command(user, fields): """Handler for running commands like boot and delete on a VM.""" print >> sys.stderr, time.time()-start_time machine = testMachineId(user, fields.getfirst('machine_id')) action = fields.getfirst('action') cdrom = fields.getfirst('cdrom') print >> sys.stderr, time.time()-start_time if cdrom is not None and not CDROM.get(cdrom): raise CodeError("Invalid cdrom type '%s'" % cdrom) if action not in ('Reboot', 'Power on', 'Power off', 'Shutdown', 'Delete VM'): raise CodeError("Invalid action '%s'" % action) if action == 'Reboot': if cdrom is not None: remctl('reboot', machine.name, cdrom) else: remctl('reboot', machine.name) elif action == 'Power on': if maxMemory(user) < machine.memory: raise InvalidInput('action', 'Power on', "You don't have enough free RAM quota to turn on this machine") bootMachine(machine, cdrom) elif action == 'Power off': remctl('destroy', machine.name) elif action == 'Shutdown': remctl('shutdown', machine.name) elif action == 'Delete VM': deleteVM(machine) print >> sys.stderr, time.time()-start_time d = dict(user=user, command=action, machine=machine) return Template(file="command.tmpl", searchList=[d, global_dict]) def testOwner(user, owner, machine=None): if not getafsgroups.checkLockerOwner(user.username, owner): raise InvalidInput('owner', owner, "Invalid") return owner def testContact(user, contact, machine=None): if contact != user.email: raise InvalidInput('contact', contact, "Invalid") return contact def testDisk(user, disksize, machine=None): return disksize def testName(user, name, machine=None): if Machine.select_by(name=name) == []: return name if name == machine.name: return name raise InvalidInput('name', name, "Already taken") def testHostname(user, hostname, machine): for nic in machine.nics: if hostname == nic.hostname: return hostname # check if doesn't already exist if NIC.select_by(hostname=hostname) == []: return hostname raise InvalidInput('hostname', hostname, "Different from before") def modify(user, fields): """Handler for modifying attributes of a machine.""" #XXX not written yet transaction = ctx.current.create_transaction() try: machine = testMachineId(user, fields.getfirst('machine_id')) owner = testOwner(user, fields.getfirst('owner'), machine) contact = testContact(user, fields.getfirst('contact')) hostname = testHostname(owner, fields.getfirst('hostname'), machine) name = testName(user, fields.getfirst('name'), machine) oldname = machine.name command="modify" olddisk = {} memory = fields.getfirst('memory') if memory is not None: memory = validMemory(user, memory, machine) else: memory = machine.memory if memory != machine.memory: machine.memory = memory disksize = testDisk(user, fields.getfirst('disk')) if disksize is not None: disksize = validDisk(user, disksize, machine) else: disksize = machine.disks[0].size for disk in machine.disks: olddisk[disk.guest_device_name] = disk.size disk.size = disksize ctx.current.save(disk) # XXX all NICs get same hostname on change? Interface doesn't support more. for nic in machine.nics: nic.hostname = hostname ctx.current.save(nic) if owner != machine.owner: machine.owner = owner if name != machine.name: machine.name = name ctx.current.save(machine) transaction.commit() except: transaction.rollback() raise remctl("web", "moveregister", oldname, name) for disk in machine.disks: # XXX all disks get the same size on change? Interface doesn't support more. if disk.size != olddisk[disk.guest_device_name]: remctl("web", "lvresize", oldname, disk.guest_device_name, str(disk.size)) if oldname != name: remctl("web", "lvrename", oldname, disk.guest_device_name, name) d = dict(user=user, command=command, machine=machine) return Template(file="command.tmpl", searchList=[d, global_dict]) def help(user, fields): """Handler for help messages.""" simple = fields.getfirst('simple') subjects = fields.getlist('subject') mapping = dict(paravm_console=""" ParaVM machines do not support console access over VNC. To access these machines, you either need to boot with a liveCD and ssh in or hope that the sipb-xen maintainers add support for serial consoles.""", hvm_paravm=""" HVM machines use the virtualization features of the processor, while ParaVM machines use Xen's emulation of virtualization features. You want an HVM virtualized machine.""", cpu_weight="""Don't ask us! We're as mystified as you are.""", owner="""The Owner must be the name of a locker that you are an AFS administrator of. In particular, you or an AFS group you are a member of must have AFS rlidwka bits on the locker. You can check see who administers the LOCKER locker using the command 'fs la /mit/LOCKER' on Athena.)""") d = dict(user=user, simple=simple, subjects=subjects, mapping=mapping) return Template(file="help.tmpl", searchList=[d, global_dict]) def info(user, fields): """Handler for info on a single VM.""" machine = testMachineId(user, fields.getfirst('machine_id')) status = statusInfo(machine) has_vnc = hasVnc(status) if status is None: main_status = dict(name=machine.name, memory=str(machine.memory)) uptime=None cputime=None else: main_status = dict(status[1:]) start_time = float(main_status.get('start_time', 0)) uptime = datetime.timedelta(seconds=int(time.time()-start_time)) cpu_time_float = float(main_status.get('cpu_time', 0)) cputime = datetime.timedelta(seconds=int(cpu_time_float)) display_fields = """name uptime memory state cpu_weight on_reboot on_poweroff on_crash on_xend_start on_xend_stop bootloader""".split() display_fields = [('name', 'Name'), ('owner', 'Owner'), ('contact', 'Contact'), ('type', 'Type'), 'NIC_INFO', ('uptime', 'uptime'), ('cputime', 'CPU usage'), ('memory', 'RAM'), 'DISK_INFO', ('state', 'state (xen format)'), ('cpu_weight', 'CPU weight'+helppopup('cpu_weight')), ('on_reboot', 'Action on VM reboot'), ('on_poweroff', 'Action on VM poweroff'), ('on_crash', 'Action on VM crash'), ('on_xend_start', 'Action on Xen start'), ('on_xend_stop', 'Action on Xen stop'), ('bootloader', 'Bootloader options'), ] fields = [] machine_info = {} machine_info['name'] = machine.name machine_info['type'] = machine.type.hvm and 'HVM' or 'ParaVM' machine_info['owner'] = machine.owner machine_info['contact'] = machine.contact nic_fields = getNicInfo(machine_info, machine) nic_point = display_fields.index('NIC_INFO') display_fields = display_fields[:nic_point] + nic_fields + display_fields[nic_point+1:] disk_fields = getDiskInfo(machine_info, machine) disk_point = display_fields.index('DISK_INFO') display_fields = display_fields[:disk_point] + disk_fields + display_fields[disk_point+1:] main_status['memory'] += ' MB' for field, disp in display_fields: if field in ('uptime', 'cputime') and locals()[field] is not None: fields.append((disp, locals()[field])) elif field in machine_info: fields.append((disp, machine_info[field])) elif field in main_status: fields.append((disp, main_status[field])) else: pass #fields.append((disp, None)) max_mem = maxMemory(user, machine) max_disk = maxDisk(user, machine) d = dict(user=user, cdroms=CDROM.select(), on=status is not None, machine=machine, has_vnc=has_vnc, uptime=str(uptime), ram=machine.memory, max_mem=max_mem, max_disk=max_disk, owner_help=helppopup("owner"), fields = fields) return Template(file='info.tmpl', searchList=[d, global_dict]) mapping = dict(list=listVms, vnc=vnc, command=command, modify=modify, info=info, create=create, help=help) if __name__ == '__main__': start_time = time.time() fields = cgi.FieldStorage() class User: username = "moo" email = 'moo@cow.com' u = User() g = Global(u) if 'SSL_CLIENT_S_DN_Email' in os.environ: username = os.environ[ 'SSL_CLIENT_S_DN_Email'].split("@")[0] u.username = username u.email = os.environ[ 'SSL_CLIENT_S_DN_Email'] else: u.username = 'moo' u.email = 'nobody' connect('postgres://sipb-xen@sipb-xen-dev/sipb_xen') operation = os.environ.get('PATH_INFO', '') # print 'Content-Type: text/plain\n' # print operation if not operation: print "Status: 301 Moved Permanently" print 'Location: ' + os.environ['SCRIPT_NAME']+'/\n' sys.exit(0) if operation.startswith('/'): operation = operation[1:] if not operation: operation = 'list' def badOperation(u, e): raise CodeError("Unknown operation") fun = mapping.get(operation, badOperation) if fun not in (help, ): connect('postgres://sipb-xen@sipb-xen-dev/sipb_xen') try: output = fun(u, fields) print 'Content-Type: text/html\n' sys.stderr.seek(0) e = sys.stderr.read() if e: output = str(output) output = output.replace('', '

STDERR:

'+e+'
') print output except CodeError, err: print 'Content-Type: text/html\n' sys.stderr.seek(0) e = sys.stderr.read() sys.stderr=sys.stdout print error(operation, u, fields, err, e) except InvalidInput, err: print 'Content-Type: text/html\n' sys.stderr.seek(0) e = sys.stderr.read() sys.stderr=sys.stdout print invalidInput(operation, u, fields, err, e) except: print 'Content-Type: text/plain\n' sys.stderr.seek(0) e = sys.stderr.read() print e print '----' sys.stderr = sys.stdout raise