path: root/backend/raw_write.py

#coding:utf-8

#!/usr/bin/python3
#
#  Copyright (c) 2007-2009 Canonical Ltd.
#
#  Author: Oliver Grawert <ogra@ubuntu.com>
#
#  Modifications 2013 from papoteur <papoteur@mageialinux-online.org>
#  and Geiger David <david.david@mageialinux-online.org>
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation; either version 2 of the
#  License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
#
#  You should have received a copy of the GNU General Public License
#  along with this program; if not, write to the Free Software Foundation,
#  Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.

import gettext
import hashlib
import io
import logging
###########
# imports #
###########
# import locale
import os
import sys
import time
from subprocess import Popen, PIPE

import gnupg


class Dumper(object):

    def _do_write(self,source,target, b):
        # Writing step
        #Dump mode
        self.returncode=0
        self.operation=True
        bs=4096*128
        try:
            ifc=io.open(source, "rb",1)
        except:
            message = _('Reading error.')+ source
            logging.debug(message)
            self.return_state = False
            self.return_message = message
            self.finished.set()
            return
        else:
            try:
                ofc= io.open(target, 'wb',0)
            except:
                 message = _("You don't have permission to write to the device {}").format(target)
                 logging.error(message)
                 self.return_state = False
                 self.return_message = message
                 self.finished.set()
                 return
            else:
                self.operation=True
                steps=list(range(0, b+1, int(b/100)))
                steps.append(b)
                indice=1
                written=0
                ncuts=int(b/bs)
                while ncuts <= 100:
                    bs=int(bs/2)
                    ncuts=int(b/bs)
                for i in range(0,int(ncuts)+1):
                    try:
                        buf=ifc.read(bs)
                    except:
                        message = _("Reading error.")
                        logging.error(message)
                        self.return_state = False
                        self.return_message = message
                        self.finished.set()
                        return
                    try:
                        ofc.write(buf)
                    except:
                        message = _("Writing error.")
                        logging.debug(message)
                        self.return_state = False
                        self.return_message = message
                        self.finished.set()
                        return
                    written+=len(buf)
                    if written > steps[indice]:
                        if indice%1==0:
                            self._progress = indice
                        indice +=1
                        try:
                            os.fsync(ofc)
                        except:
                           message = _("Writing error.")
                           logging.debug(message)
                           self.return_state = False
                           self.return_message = message
                           self.finished.set()
                           return
                try:
                    ofc.close()
                except:
                   message = _("Writing error.")
                   logging.error(message)
                   self.return_message = message
                   self.return_state = False
                   return
            ifc.close()
            self._progress = 100
            self.finished.set()
            self.return_state = True
            self.return_message = _("Writing terminated")
            logging.debug(self.return_message)
            return

    def _get_sum(self, source):
        self.return_state = False
        logging.debug("Starting getting sum")
        #       Check if the sum file has a valid signature
        gpg = gnupg.GPG()
        gpg.encoding = 'utf-8'
        # Use Mageia public key
        self.sum_type = 'sha3'
        sig_file = "{}.{}.gpg".format(source, self.sum_type)
        self.source_file = "{}.{}".format(source, self.sum_type)
        try:
            gpg.recv_keys('pool.sks-keyservers.net', 'EDCA7A90')
            self.sum_check_searched = True
            with open(sig_file, 'rb') as g:
                self.signature_found = True
                verified = gpg.verify_file(g)
                if verified:
                    self.signature_checked = True
                    logging.debug("signature checked")
                else:
                    self.signature_checked = False
        except:
            self.signature_found = False
            logging.info(_("Signature file {} not found\n").format(sig_file))
        try:
            # Look for sum files in the same directory as source
            with open(self.source_file,'r') as fs:
                # Read the sum in the file
                self.sum_check=(fs.readline()).split()[0]
            self.sum_file = True
        except:
            logging.info(_("Sum file {} not found\n").format(self.source_file))
            self.sum_file = False

    def _check_write(self, target, source):
        logging.debug("Start checking")
        self.return_state = False
        self.return_message = ""
        b = os.path.getsize(source)
        # Compute the sum from the written device
        steps=list(range(0, b+1, int(b/100)))
        steps.append(b)
        indice=0
        checked=0
        sha512func=hashlib.sha3_512()
        ncuts=int(b/1024)
        #try:
        with open(target, 'rb') as f:
            for x in range(0,ncuts):
                block = f.read(1024)
                sha512func.update(block)
                if checked > steps[indice]:
                    self._progress = indice
                    indice +=1
                checked+=1024
            logging.debug("last read %d"%(b-ncuts*1024))
            block = f.read(b-ncuts*1024)
            sha512func.update(block)
            sha512sumcalc=sha512func.hexdigest().upper()
        f.close()
        if self.signature_found and not self.signature_checked:
                #,  keep the pourcent, this is the place for source file name
            self.return_message = _('Invalid signature for %s')%self.source_file
        if (self.sum_check == "") :  # Can't get stored sum
                self.return_message += _('SHA3 sum: {}').format(sha512sumcalc)
        #  compare the sums
        elif (sha512sumcalc == self.sum_check) :
            if self.signature_checked:
                #,  keep the bracket, this is the place for sum type
                self.return_message +="\n" + _("The {} sum check is OK and the sum is signed").format(self.sum_type)
            else :
                if self.signature_found:
                    self.return_message +="\n" + _("The signature of the sum is false !").format(self.sum_type)
                else:
                    #,  keep the bracket, this is the place for sum type
                    self.return_message +="\n" + _("The {} sum check is OK but the signature can't be found").format(self.sum_type)
        else:
            self.return_message +="\n" + _("/!\\The computed and stored sums don't match")
        #except:
        	#pass
        self._progress = 100

        logging.info(self.return_message)
        self.return_state = True
        self.finished.set()

    def udev_wait(self, operation):
        wait = Popen(["udevadm","settle","--timeout=15"], stderr=PIPE)
        wait.communicate()
        working=True
        while working:
            time.sleep(0.5)
            wait.poll()
            rc=wait.returncode
            if not (rc is None):
                wait = None
                working= False
        if rc != 0:
            self.return_state = False
            self.return_message = _("Timeout reached when {}".format(operation))
            return False
        return True
        

    def _do_persistence(self, target, label, key):
        logging.debug("Start doing persistence partition")
        p = Popen(["fdisk",target], stdin = PIPE, stderr=PIPE)
        outs, errs = p.communicate(input=b'n\np\n3\n\n\nw\n')
        working=True
        while working:
            time.sleep(0.5)
            p.poll()
            rc=p.returncode
            if rc is None:
                working=True
            else:
                process = None
                working= False
        if rc != 0:
            self.return_state = False
            self.return_message = _("Error while doing persistent partition: ") + errs.decode('utf-8')
            return
        logging.debug("New partition created")
        self._progress = 33

        # Wait for propagation of the info of new partition table
        if not self.udev_wait("creating a new partition table"):
            return
        self._progress = 50
        if key == "":
            # example mkfs.ext4 -L mgalive-persist /dev/sdf3
            process = Popen(['mkfs.ext4', "-q",'-F','-L', label,  target+"3"],stderr=PIPE)
            outs, errs = process.communicate()
            working=True
            while working:
                time.sleep(0.5)
                process.poll()
                rc=process.returncode
                if rc is None:
                    working=True
                else:
                    process = None
                    working= False
            if rc == 0:
                self.return_state = True
                self._progress = 100
                self.return_message = _("Persistent partition done")
            else:
                self.return_state = False
                self.return_message = _("Error while doing persistent partition: ") + errs.decode("utf-8") 
                self.finished.set()
                return
            logging.info("Persistent partition done")
            if not self.udev_wait(_("formatting partition")):
                return
        else:
            # example cryptsetup luksFormat /dev/sdb3
            print("Crypt key provided",file=sys.stderr)
            base_target = os.path.basename(target) + "3"
            process = Popen(['cryptsetup','luksFormat','-q', target+"3", '-d', '-'],stdin=PIPE, stderr=PIPE)
            outs, errs = process.communicate(input=key.encode('utf-8'))
            working=True
            while working:
                time.sleep(0.5)
                process.poll()
                rc=process.returncode
                if rc is None:
                    working=True
                else:
                    process = None
                    working= False
            if rc != 0:
                self.return_state = False
                self.return_message = _("Error while doing persistent partition: ") + errs.decode("utf-8") 
                logging.error(self.return_message)
                self.finished.set()
                return
            self._progress = 75
            # cryptsetup open /dev/sdb3 crypt_sdb3
            if not self.udev_wait("creating encrypted partition"):
                return

            process = Popen(['cryptsetup','luksOpen',  target + "3", 'crypt_' + base_target ,'-d','-'],stdin=PIPE, stderr=PIPE)
            outs, errs = process.communicate(input=key.encode('utf-8'))
            working=True
            while working:
                time.sleep(0.5)
                process.poll()
                rc=process.returncode
                if rc is None:
                    working=True
                else:
                    process = None
                    working= False
            if rc != 0:
                self.return_state = False
                self.return_message = _("Error while doing persistent partition: ") + errs.decode("utf-8") 
                logging.error(self.return_message)
                self.finished.set()
                return

            if not self.udev_wait(_("opening encrypted partition")):
                return
            # mkfs.ext4 -L mgalive-persist /dev/mapper/crypt_sdb3
            process = Popen(['mkfs.ext4','-q','-F','-L', label,  '/dev/mapper/crypt_' + base_target],stderr=PIPE)
            outs, errs = process.communicate()
            working=True
            while working:
                time.sleep(0.5)
                process.poll()
                rc=process.returncode
                if rc is None:
                    working=True
                else:
                    process = None
                    working= False
            if rc != 0:
                self.return_state = False
                self.return_message = _("Error while doing persistent partition: ") + errs.decode("utf-8") 
                logging.error(self.return_message)
                self.finished.set()
                return
            # cryptsetup close crypt_sdb3

            if not self.udev_wait(_("formatting encrypted partition")):
                return
            process = Popen(['cryptsetup','luksClose', 'crypt_' + base_target ])
            outs, errs = process.communicate()
            working=True
            while working:
                time.sleep(0.5)
                process.poll()
                rc=process.returncode
                if rc is None:
                    working=True
                else:
                    process = None
                    working= False
            if rc != 0:
                self.return_state = False
                self.return_message = _("Error while doing persistent partition: ") + errs.decode("utf-8") 
                logging.error(self.return_message)
            else:
                self.return_state = True
                self.return_message = _("Persistent partition done")
                logging.info("Persistent partition done")
            if not self.udev_wait(_("closing encrypted partition")):
                return
        self._progress = 100
        self.finished.set()
        logging.debug("Finished")


    def __init__(self):
        gettext.install('isodumper', localedir='/usr/share/locale')
        # Operation running
        self.operation=False