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Ê×Ò³ > ²Ù×÷ϵͳ > Linux&Uinx > Íæ×ªUbuntu LinuxÖ®¼ÓÃÜÎļþϵͳƪ > ÕýÎÄ

Íæ×ªUbuntu LinuxÖ®¼ÓÃÜÎļþϵͳƪ

³ö´¦£º51CTO.com ×÷Õߣº51CTO.com ʱ¼ä£º2007-2-10 11:01:03
  µ±Ubuntu LinuxʹÓüÓÃÜÎļþϵͳºó£¬Êý¾ÝµÄ°²È«Äܵõ½ºÜºÃµÄ±£»¤¡£ÔÚÕâÖÖÇé¿öÏ£¬¼´Ê¹°ÑÎÒÃǵĻúÆ÷Ë͸øºÚ¿Í£¬Ö»ÒªËûÃÇûÓÐÃÜÔ¿£¬ºÚ¿Í¿´µ½µÄÊý¾ÝÖ»»áÊÇÒ»¶ÑÂÒÂ룬ºÁÎÞÀûÓüÛÖµ¿ÉÑÔ¡£

    ±¾ÎĽ«Ïêϸ½éÉÜÀûÓÃdm-cryptÀ´´´½¨¼ÓÃÜÎļþϵͳµÄ·½·¨¡£ÓëÆäËü´´½¨¼ÓÃÜÎļþϵͳµÄ·½·¨Ïà±È£¬dm-cryptϵͳÓÐ×ÅÎ޿ɱÈÄâµÄÓÅÔ½ÐÔ£ºËüµÄËٶȸü¿ì£¬Ò×ÓÃÐÔ¸üÇ¿¡£³ý´ËÖ®Í⣬ËüµÄÊÊÓÃÃæÒ²ºÜ¹ã£¬Äܹ»ÔËÐÐÔÚ¸÷ÖÖ¿éÉ豸ÉÏ£¬¼´Ê¹ÕâЩÉ豸ʹÓÃÁËRAIDºÍ LVMÒ²ºÁÎÞÕϰ­¡£dm-cryptϵͳ֮ËùÒÔ¾ßÓÐÕâЩÓŵ㣬Ö÷ÒªµÃÒæÓڸü¼ÊõÊǽ¨Á¢ÔÚ2.6°æ±¾Äں˵Ädevice-mapperÌØÐÔÖ®Éϵġ£ device-mapperÊÇÉè¼ÆÓÃÀ´ÎªÔÚʵ¼ÊµÄ¿éÉ豸֮ÉÏÌí¼ÓÐéÄâ²ãÌṩһÖÖͨÓÃÁé»îµÄ·½·¨£¬ÒÔ·½±ã¿ª·¢ÈËԱʵÏÖ¾µÏñ¡¢¿ìÕÕ¡¢¼¶ÁªºÍ¼ÓÃܵȴ¦Àí¡£´ËÍ⣬ dm-cryptʹÓÃÁËÄÚºËÃÜÂëÓ¦Óñà³Ì½Ó¿ÚʵÏÖÁË͸Ã÷µÄ¼ÓÃÜ£¬²¢ÇÒ¼æÈÝcryptloopϵͳ¡£

Ò»¡¢ÅäÖÃÄÚºË

   dm -cryptÀûÓÃÄں˵ÄÃÜÂëÓ¦Óñà³Ì½Ó¿ÚÀ´Íê³ÉÃÜÂë²Ù×÷¡£Ò»°ã˵À´£¬ÄÚºËͨ³£½«¸÷ÖÖ¼ÓÃܳÌÐòÒÔÄ£¿éµÄÐÎʽ¼ÓÔØ¡£¶ÔÓÚ256-bit AESÀ´Ëµ£¬Æä°²È«Ç¿¶ÈÒѾ­·Ç³£Ö®¸ß£¬¼´±ãÓÃÀ´±£»¤¾øÃܼ¶µÄÊý¾ÝÒ²×ã¹»ÁË¡£Òò´Ë±¾ÎÄÖÐÎÒÃÇʹÓÃ256-bit AESÃÜÂ룬ΪÁ˱£Ö¤ÄúµÄÄÚºËÒѾ­¼ÓÔØAESÃÜÂëÄ£¿é£¬ÇëÀûÓÃÏÂÁÐÃüÁî½øÐмì²é£º

$ cat /proc/crypto
Èç¹û¿´µ½ÀàËÆÏÂÃæµÄÊä³öµÄ»°£¬ËµÃ÷AESÄ£¿éÒѾ­¼ÓÔØ£º
name         : aes

module       : aes

type         : cipher

blocksize    : 16

min keysize  : 16

max keysize  : 32

·ñÔò£¬ÎÒÃÇ¿ÉÒÔÀûÓÃmodprobeÀ´ÊÖ¹¤¼ÓÔØAESÄ£¿é£¬ÃüÁîÈçÏÂËùʾ£º

$ sudo modprobe aes

½ÓÏÂÀ´°²×°dmsetupÈí¼þ°ü£¬¸ÃÈí¼þ°üº¬ÓÐÅäÖÃdevice-mapperËùÐèµÄ¹¤¾ß£º

$ sudo apt-get install dmsetup cryptsetup
Ϊ¼ì²édmsetupÈí¼þ°üÊÇ·ñÒѾ­½¨Á¢ÁËÉ豸ӳÏó³ÌÐò£¬¼üÈëÏÂÁÐÃüÁ

$ ls -l /dev/mapper/control
½ÓÏÂÀ´¼ÓÔØdm-cryptÄÚºËÄ£¿é£º
$ sudo modprobe dm-crypt
dm-crypt¼ÓÔØºó£¬Ëü»áÓÃevice-mapper×Ô¶¯×¢²á¡£Èç¹ûÔٴμìÑéµÄ»°£¬device-mapperÒÑÄÜʶ±ðdm-crypt£¬²¢ÇÒ°Ñcrypt Ìí¼ÓΪ¿ÉÓõĶÔÏó£º

$ sudo dmsetup targets
Èç¹ûÒ»ÇÐ˳Àû£¬ÏÖÔÚÄãÓ¦¸Ã¿´µ½cryptµÄÏÂÁÐÊä³ö£º
crypt            v1.1.0

striped          v1.0.2

linear           v1.0.1

error            v1.0.1

Õâ˵Ã÷ÎÒÃǵÄϵͳÒѾ­Îª×°ÔؼÓÃÜÉ豸×öºÃÁË×¼±¸¡£ÏÂÃæ£¬ÎÒÃÇÏÈÀ´½¨Á¢Ò»¸ö¼ÓÃÜÉ豸¡£

¶þ¡¢½¨Á¢¼ÓÃÜÉ豸

    Òª´´½¨×÷Ϊ¼ÓÃÜÉè±¸×°ÔØµÄÎļþϵͳ£¬ÓÐÁ½ÖÖÑ¡Ôñ£ºÒ»Êǽ¨Á¢Ò»¸ö´ÅÅÌÓ³Ïñ£¬È»ºó×÷Ϊ»ØËÍÉ豸¼ÓÔØ£»¶þÊÇʹÓÃÎïÀíÉ豸¡£ÎÞÂÛÄÇÖÖÇé¿ö£¬³ýÁËÔÚ½¨Á¢ºÍÀ¦°ó»ØËÍÉ豸Í⣬ÆäËü²Ù×÷¹ý³Ì¶¼ÊÇÏàËÆµÄ¡£

1.½¨Á¢»ØËÍ´ÅÅÌÓ³Ïó

    Èç¹ûÄãûÓÐÓÃÀ´¼ÓÃܵÄÎïÀíÉ豸£¨±ÈÈç´æ´¢°ô»òÁíÍâµÄ´ÅÅÌ·ÖÇø£©£¬×÷ÎªÌæ»»£¬Äã¿ÉÒÔÀûÓÃÃüÁîddÀ´½¨Á¢Ò»¸ö¿Õ´ÅÅÌÓ³Ïó£¬È»ºó½«¸ÃÓ³Ïó×÷Ϊ»ØËÍÉ豸À´×°ÔØ£¬ÕÕÑùÄÜÓá£ÏÂÃæÎÒÃÇÒÔʵÀýÀ´¼ÓÒÔ½éÉÜ£º

$ dd if=/dev/zero of=~/secret.img bs=1M count=100
    ÕâÀïÎÒÃÇн¨ÁËÒ»¸ö´óСΪ100 MBµÄ´ÅÅÌÓ³Ï󣬸ÃÓ³ÏóÃû×ÖΪsecret.img¡£ÒªÏë¸Ä±äÆä´óС£¬¿ÉÒԸıäcountµÄÖµ¡£               

    ½ÓÏÂÀ´£¬ÎÒÃÇÀûÓÃlosetupÃüÁ¸ÃÓ³ÏóºÍÒ»¸ö»ØËÍÉ豸ÁªÏµÆðÀ´£º

$ sudo losetup /dev/loop/0 ~/secret.img
    ÏÖÔÚ£¬ÎÒÃÇÒѾ­µÃµ½ÁËÒ»¸öÐéÄâµÄ¿éÉ豸£¬ÆäλÓÚ/dev/loop/0£¬²¢ÇÒÎÒÃÇÄܹ»ÈçͬʹÓÃÆäËüÉ豸ÄÇÑùÀ´Ê¹ÓÃËü¡£

2.ÉèÖÿéÉ豸

    ×¼±¸ºÃÁËÎïÀí¿éÉ豸£¨ÀýÈç/dev/sda1£©£¬»òÕßÊÇÐéÄâ¿éÉ豸£¨ÏñÇ°ÃæÄÇÑù½¨Á¢ÁË»ØËÍÓ³Ï󣬲¢ÀûÓÃdevice-mapper½«Æä×÷Ϊ¼ÓÃܵÄÂß¼­¾í¼ÓÔØ£©£¬ÎÒÃǾͿÉÒÔ½øÐпéÉ豸ÅäÖÃÁË¡£

    ÏÂÃæÎÒÃÇʹÓÃcryptsetupÀ´½¨Á¢Âß¼­¾í£¬²¢½«ÆäÓë¿éÉ豸À¦°ó£º

$ sudo cryptsetup -y create myEncryptedFilesystem          

/dev/DEVICENAME
    ÆäÖУ¬myEncryptedFilesystem ÊÇн¨µÄÂß¼­¾íµÄÃû³Æ¡£²¢ÇÒ×îºóÒ»¸ö²ÎÊý±ØÐëÊǽ«ÓÃ×÷¼ÓÃܾíµÄ¿éÉ豸¡£ËùÒÔ£¬Èç¹ûÄãҪʹÓÃÇ°Ãæ½¨Á¢µÄ»ØËÍÓ³Ïó×÷ΪÐéÄâ¿éÉ豸µÄ»°£¬Ó¦µ±ÔËÐÐÒÔÏÂÃüÁ

$ sudo cryptsetup -y create myEncryptedFilesystem  /dev/loop/0
    ÎÞÂÛÊÇʹÓÃÎïÀí¿éÉ豸»¹ÊÇÐéÄâ¿éÉ豸£¬³ÌÐò¶¼»áÒªÄãÊäÈëÂß¼­¾íµÄ¿ÚÁ-yµÄ×÷ÓÃÔÚÓÚÒªÄãÊäÈëÁ½´Î¿ÚÁîÒÔÈ·±£ÎÞÎó¡£ÕâÒ»µãºÜÖØÒª£¬ÒòΪһµ©¿ÚÁîŪ´í£¬Äã¾Í»á°Ñ×Ô¼ºµÄÊý¾ÝËø×¡£¬Õâʱ˭Ҳ°ï²»ÁËÄúÁË£¡

   ΪÁËÈ·ÈÏÂß¼­¾íÊÇ·ñÒѾ­½¨Á¢£¬¿ÉÒÔʹÓÃÏÂÁÐÃüÁî½øÐмì²éһϣº

$ sudo dmsetup ls
    Ö»Òª¸ÃÃüÁîÁгöÁËÂß¼­¾í£¬¾Í˵Ã÷ÒѾ­³É¹¦½¨Á¢ÁËÂß¼­¾í¡£²»¹ý¸ù¾Ý»úÆ÷µÄ²»Í¬£¬É豸ºÅ¿ÉÄÜÓÐËù²»Í¬£º

myEncryptedFilesystem  (221, 0)
    device-mapper»á°ÑËüµÄÐéÄâÉè±¸×°ÔØµ½/dev/mapperÏÂÃæ£¬ËùÒÔ£¬ÄãµÄÐéÄâ¿éÉ豸Ӧ¸ÃÊÇ/dev/mapper/myEncryptedFilesystem £¬¾¡¹ÜÓÃÆðÀ´ËüºÍÆäËü¿éÉ豸ûʲô²»Í¬£¬Êµ¼ÊÉÏËüÈ´ÊǾ­¹ý͸Ã÷¼ÓÃܵġ£

    ÈçͬÎïÀíÉ豸һÑù£¬ÎÒÃÇÒ²¿ÉÒÔÔÚÐéÄâÉ豸ÉÏ´´½¨Îļþϵͳ£º

$ sudo mkfs.ext3 /dev/mapper/myEncryptedFilesystem
    ÏÖÔÚΪеÄÐéÄâ¿éÉ豸½¨Á¢Ò»¸ö×°ÔØµã£¬È»ºó½«Æä×°ÔØ¡£ÃüÁîÈçÏÂËùʾ£º

$ sudo mkdir /mnt/myEncryptedFilesystem

$ sudo mount /dev/mapper/myEncryptedFilesystem  /mnt/myEncryptedFilesystem
     ÎÒÃÇÄܹ»ÀûÓÃÏÂÃæµÄÃüÁî²é¿´Æä×°ÔØºóµÄÇé¿ö£º

$ df -h /mnt/myEncryptedFilesystem

Filesystem              Size  Used Avail Use% Mounted on

/dev/mapper/myEncryptedFilesystem     97M  2.1M   90M   2% /mnt/myEncryptedFilesystem

    ºÜºÃ£¬ÎÒÃÇ¿´µ½×°ÔصÄÎļþϵͳ£¬¾¡¹Ü¿´ÆðÀ´ÓëÆäËüÎļþϵͳÎÞÒ죬µ«Êµ¼ÊÉÏдµ½/mnt/myEncryptedFilesystem /ϵÄËùÓÐÊý¾Ý£¬ÔÚÊý¾ÝдÈë֮ǰ¶¼ÊǾ­¹ý͸Ã÷µÄ¼ÓÃÜ´¦Àíºó²ÅдÈë´ÅÅ̵ģ¬Òò´Ë£¬´Ó¸Ã´¦¶ÁÈ¡µÄÊý¾Ý¶¼ÊÇЩÃÜÎÄ¡£Èý¡¢Ð¶ÔØ·½·¨

    ÒªÐ¶ÔØ¼ÓÃÜÎļþϵͳ£¬ºÍƽ³£µÄ·½·¨Ã»Ê²Ã´Á½Ñù£º

$ sudo umount /mnt/myEncryptedFilesystem
    ¼´±ãÒѾ­Ð¶ÔØÁË¿éÉ豸£¬ÔÚdm-cryptÖÐÈÔÈ»ÊÓΪһ¸öÐéÄâÉ豸¡£ÈçÈô²»ÐÅ£¬Äã¿ÉÒÔÔÙ´ÎÔËÐÐÃüÁîsudo dmsetup lsÀ´Ñé֤һϣ¬Äã»á¿´µ½¸ÃÉ豸ÒÀÈ»»á±»Áгö¡£ÒòΪdm-crypt»º´æÁË¿ÚÁËùÒÔ»úÆ÷ÉÏµÄÆäËüÓû§²»ÐèÒªÖªµÀ¿ÚÁî¾ÍÄÜÖØÐÂ×°ÔØ¸ÃÉ豸¡£ÎªÁ˱ÜÃâÕâÖÖÇé¿ö·¢Éú£¬Äã±ØÐëÔÚÐ¶ÔØÉ豸ºó´Ódm-cryptÖÐÏÔʽµÄɾ³ý¸ÃÉ豸¡£ÃüÁî¾ßÌåÈçÏÂËùʾ£º
$ sudo cryptsetup remove myEncryptedFilesystem
    ´Ëºó£¬Ëü½«³¹µ×Çå³ý£¬ÒªÏëÔÙ´Î×°ÔØµÄ»°£¬Äã±ØÐëÔÙ´ÎÊäÈë¿ÚÁΪÁ˼ò»¯¸Ã¹ý³Ì£¬ÎÒÃÇ¿ÉÒÔÀûÓÃÒ»¸ö¼òµ¥µÄ½Å±¾À´Íê³ÉÐ¶ÔØºÍÇå³ý¹¤×÷£º
#!/bin/sh

umount /mnt/myEncryptedFilesystem

cryptsetup remove myEncryptedFilesystem
ËÄ¡¢ÖØÐÂ×°ÔØ

    ÔÚÐ¶ÔØ¼ÓÃÜÉ豸ºó£¬ÎÒÃǺܿÉÄÜ»¹Ðè×÷ΪÆÕͨÓû§À´×°ÔØËüÃÇ¡£ÎªÁ˼ò»¯¸Ã¹¤×÷£¬ÎÒÃÇÐèÒªÔÚ/etc/fstabÎļþÖÐÌí¼ÓÏÂÁÐÄÚÈÝ£º
/dev/mapper/myEncryptedFilesystem  /mnt/myEncryptedFilesystem  ext3 noauto,noatime 0 0
   ´ËÍ⣬ÎÒÃÇÒ²¿ÉÒÔͨ¹ý½¨Á¢½Å±¾À´ÌæÎÒÃÇÍê³Édm-cryptÉ豸µÄ´´½¨ºÍ¾íµÄ×°ÔØ¹¤×÷£¬·½·¨ÊÇÓÃʵ¼ÊÉ豸µÄÃû³Æ»òÎļþ·¾¶À´Ìæ»»/dev/DEVICENAME£º
#!/bin/sh

cryptsetup create myEncryptedFilesystem  /dev/DEVICENAME

mount /dev/mapper/myEncryptedFilesystem  /mnt/myEncryptedFilesystem
   Èç¹ûÄãʹÓõÄÊÇ»ØËÍÉ豸µÄ»°£¬Ä㻹ÄÜÀûÓýű¾À´À¦°óÉ豸£º
#!/bin/sh 

losetup /dev/loop/0 ~/secret.img

cryptsetup create myEncryptedFilesystem  /dev/loop/0

mount /dev/mapper/myEncryptedFilesystem  /mnt/myEncryptedFilesystem
    Èç¹ûÄãÊÕµ½ÏûÏ¢¡°ioctl: LOOP_SET_FD: Device or resource busy¡±£¬Õâ˵Ã÷»ØËÍÉ豸ºÜ¿ÉÄÜÈÔÈ»×°ÔØÔÚϵͳÉÏ¡£ÎÒÃÇ¿ÉÒÔÀûÓÃsudo losetup -d /dev/loop/0ÃüÁÆäɾ³ý¡£

Îå¡¢¼ÓÃÜÖ÷Ŀ¼

    Èç¹ûÅäÖÃÁËPAM£¨Pluggable Authentication Modules£¬¼´¿É²åÈëʽ¼ø±ðÄ£¿é£©×ÓϵͳÔÚÄúµÇÂ¼Ê±×°ÔØÖ÷Ŀ¼µÄ»°£¬ÄãÉõÖÁ»¹ÄܼÓÃÜÕû¸öÖ÷Ŀ¼¡£ÒòΪlibpam-mountÄ£¿éÔÊÐíPAMÔÚÓû§µÇ¼ʱ×Ô¶¯×°ÔØÈÎÒâÉ豸£¬ËùÒÔÎÒÃÇÒªÁ¬Í¬opensslÒ»ÆðÀ´°²×°¸ÃÄ£¿é¡£ÃüÁîÈçÏÂËùʾ£º

$ sudo apt-get install libpam-mount openssl
    ½ÓÏÂÀ´£¬±à¼­Îļþ/etc/pam.d/common-auth£¬ÔÚÆäĩβÌí¼ÓÏÂÁÐÒ»ÐУº
auth    optional        pam_mount.so use_first_pass
    È»ºóÔÚÎļþ/etc/pam.d/common-sessionĩβÌí¼ÓÏÂÁÐÒ»ÐÐÄÚÈÝ£º
session optional        pam_mount.so

    ÏÖÔÚ£¬ÎÒÃÇÀ´ÉèÖÃPAM£¬¸æËßËüÐèÒª×°ÔØÄÄЩ¾í¡¢ÒÔ¼°×°ÔØÎ»Ö᣶Ա¾Àý¶øÑÔ£¬¼ÙÉèÓû§ÃûÊÇIan£¬ÒªÓõ½µÄÉ豸ÊÇ/dev/sda1£¬ÒªÌí¼Óµ½/etc/security/pam_mount.confÎļþÖеÄÄÚÈÝÈçÏÂËùʾ£º

volume Ian crypt - /dev/sda1 /home/Ian cipher=aes aes-256-ecb /home/Ian.key
    Èç¹ûÏëʹÓôÅÅÌÓ³Ïó£¬ÄãÐèÒªÔڴ˹涨»ØËÍÉ豸£¨±ÈÈç/dev/loop/0£©£¬²¢È·±£ÔÚIanµÇ¼֮ǰϵͳÒѾ­ÔËÐÐlosetup¡£Îª´Ë£¬Äã¿ÉÒÔ½« losetup /dev/loop/0 /home/secret.img·ÅÈë/etc/rc.localÎļþÖС£ÒòΪ¸Ã¾í±»¼ÓÃÜ£¬ËùÒÔPAMÐèÒªÃÜÔ¿À´×°ÔØ¾í¡£×îºóµÄ²ÎÊýÓÃÀ´¸æËßPAMÃÜÔ¿ÔÚ /home/Ian.keyÎļþÖУ¬Îª´Ë£¬Í¨¹ýʹÓÃOpenSSLÀ´¼ÓÃÜÄãµÄ¿ÚÁîÀ´½¨Á¢ÃÜÔ¿Îļþ£º

$ sudo sh -c "echo

'



YOUR PASSPHRASE



'

| openssl aes-256-ecb >



/home/Ian.key"
    Õâʱ£¬ÌáʾÄãÊäÈëÃÜÂë¡£×¢Ò⣬ÕâÀïµÄ¿ÚÁî±ØÐèºÍÏëÒªµÄÓû§µÇ¼ÃÜÂëÒ»Ö¡£Ô­ÒòÊǵ±ÄãµÇ¼ʱ£¬PAMÐèÒªÄãÌṩÕâ¸öÃÜÂ룬ÓÃÒÔ¼ÓÃÜÄãµÄÃÜÔ¿Îļþ£¬È»ºó¸ù¾Ý°üº¬ÔÚÃÜÔ¿ÎļþÖеĿÚÁîÓÃdm-crypt×°ÔØÄãµÄÖ÷Ŀ¼¡£

    ÐèҪעÒâµÄÊÇ£¬ÕâÑù×ö»á°ÑÄãµÄ¿ÚÁîÒÔÃ÷ÎĵÄÐÎʽ±©Â¶ÔÚ.historyÎļþÖУ¬ËùÒÔÒª¼°Ê±ÀûÓÃÃüÁîhistory -cÇå³þÄãµÄÀúÊ·¼Ç¼¡£´ËÍ⣬ҪÏë±ÜÃâ°Ñ¿ÚÁî´æ·ÅÔÚ¼ÓÃܵÄÃÜÔ¿ÎļþÖеϰ£¬¿ÉÒÔÈô´½¨¼ÓÃÜÎļþϵͳµÄ¿ÚÁîºÍµÇ¼¿ÚÁîÍêȫһÖ¡£ÕâÑù£¬ÔÚÉí·ÝÈÏ֤ʱ£¬PAM Ö»Òª°ÑÄãµÄÃÜÂë´«¸ødm-crypt¾Í¿ÉÒÔÁË£¬¶ø²»±Ø´ÓÃÜÔ¿ÎļþÖгéÈ¡ÃÜÂ롣Ϊ´Ë£¬Äã¿ÉÒÔÔÚ/etc/security/pam_mount.confÎļþÖÐʹÓÃÏÂÃæµÄÃüÁîÐУº

volume Ian crypt - /dev/sda1 /home/Ian cipher=aes - -
    ×îºó£¬ÎªÁ˱£Ö¤ÔÚÍ˳öϵͳʱ×Ô¶¯Ð¶ÔؼÓÃÜÖ÷Ŀ¼£¬Çë±à¼­/etc/login.defsÎļþʹµÃCLOSE_SESSIONSÏîÅäÖÃÈçÏ£º
CLOSE_SESSIONS yes


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