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Re: shadow È­ÀÏ »ý¼º°ü·Ã Áú¹®ÀÔ´Ï´Ù.



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[ÀÌÀü ±Û] [´ÙÀ½ ±Û] [ÀÌÀü ´ñ±Û] [´ÙÀ½ ´ñ±Û]


¾È³çÇϼ¼¿ä.

> ±×·±µ¥ »ç¿ëÀÚ°èÁ¤ÀÌ passwd È­ÀÏ Çϳª·Î  °ü¸®°¡ µÇ³×¿ä..
> ¼Ö¶ó¸®½º°°Àº °æ¿ì´Â ¼³Ä¡½Ã ±âº»ÀûÀ¸·Î passwd/shadow È­ÀÏ ÇüÅ·Î
> °ü¸®°¡ µÇ´øµ¥..
> À̰͵µ ±×·¸°Ô ÇÒ ¼ö ÀÖ³ª¿ä..
> ¾Æ¹«¸® ã¾ÆºÁµµ ±×·±³»¿ëÀÌ ¾ø¾î¼­ ÀÌ·¸°Ô ¸ÞÀÏ µå¸³´Ï´Ù.

±×·¸Áø ¾Ê°í¿ä, ºñ½ÁÇÕ´Ï´Ù. SolarisÀÇ shadow password ½Ã½ºÅÛ°ú ºñ½ÁÇÑ
ÇüÅÂÀ̱ä ÇÏÁö¸¸ /etc/shadow°¡ ¾Æ´Ï¶ó, /etc/master.passwd ÀÔ´Ï´Ù.

FreeBSDÀÇ °æ¿ì ºü¸¥ Á¤º¸ ÃßÃâÀ» À§ÇØ db ½ºÅ¸ÀÏÀÇ
/etc/pwd.db(passwd¿¡ ÇØ´ç)¿Í /etc/spwd.db (master.passwd)µµ °°ÀÌ À¯ÁöÇÕ´Ï´Ù.
vipw ¸í·ÉÀº 4°³ÀÇ µ¥ÀÌÅͺ£À̽º°¡ ¸ðµÎ ¾÷µ¥ÀÌÆ® ½ÃŰ´Â ±â´ÉÀ» ÇÕ´Ï´Ù.

> ¾ÆÂü ±×¸®°í Á¦°¡ shadow È­ÀÏÀ» »ç¿ëÇϰíÀÚ ÇÏ´Â ÀÌÀ¯°¡
> ±âÁ¸ ¼Ö¶ó¸®½º¿¡¼­ »ç¿ëÁßÀÎ passwd/shadow È­ÀÏÀ» ±×´ë·Î
> »ç¿ëÇÒ·Á°í Çϴ°ÍÀε¥ À̰ÍÀÌ °¡´ÉÇѰ¡¿ä
> ¾Ïȣȭ ¹æ½Ä¿¡ Â÷À̰¡ ¾ø´ÂÁö...
À½.. ±Û½ê¿ä. FreeBSD¿¡¼­´Â ´õ¿í źźÇÑ DES³ª MD5¸¦ ¾²±â ¶§¹®¿¡
Solaris¿Í LinuxµîÀÇ ±×°Í°ú ȣȯÀÌ ¾ÈµË´Ï´Ù.
±âº»ÀûÀ¸·Î´Â ±âÁ¸ »ç¿ëÀÚ¸¦ ±×´ë·Î ³Ö±â°¡ Èûµéµí Çϰí¿ä.

make world½Ã -D Ç÷¡±×·Î Çѹø¿¡ ¶³¾î¶ß¸®´Â ¹æ¹ýÀº ¾ø´Â°É·Î
¾Ë°í¿ä. ¾îÂ÷ÇÇ ¾Ïȣȭ´Â ¸ðµÎ crypt()ÇѼö·Î »ç¿ëÇϴϱî,
/usr/src/libcrypt/crypt.c ÀÇ MD5 ·çƾ Äڵ带 ¹Ù²ÛÈÄ,
ÇØ´ç ¶óÀ̺귯¸®¸¦ ´Ù½Ã ÀνºÅç Çϰųª, make world ÇÏ¸é µÉ°Íµµ
°°½À´Ï´Ù. ±âº» ¹èÆ÷º»Àº ¸ðµÎ ELF¶ó ¶óÀ̺귯¸®¸¸ Àç ¼³Ä¡Çصµ
µÉµí ÇÕ´Ï´Ù¸¸, »ç¿ëÀÚ ÆÐ½º¿öµå¸¦ °Çµå¸®´Â aout Çü½Ä ÆÄÀÏÀÌ
ÀÖ´Ù¸é, ÀÌ°Ç ´Ù½Ã ÄÄÆÄÀÏÀÌ µÇ¾î¾ß ÇÒ°Å °°³×¿ä..

±×·³.

-- 
o R&D/Senior researcher: Seung-young Kim
o Tel: +82-42-864-4440/1 , Fax: +82-42-864-4442
o Personal home: http://nobreak.nobreak.ne.kr
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