Linux Certif

Toute la documentation sur la certification Linux LPI

hosts_access

NAME

hosts_access - ¥Û¥¹¥È¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë¥Õ¥¡¥¤¥ë¤Î½ñ¼°

DESCRIPTION

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¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë½ñË¡¤Î³ÈÄ¥¤µ¤ì¤¿Éôʬ¤Ë´Ø¤·¤Æ¤Ï¡¢ hosts_options(5) ¤Îʸ½ñ¤Ç²òÀ⤹¤ë¡£¤³¤Î³ÈÄ¥¤Ï¡¢¥×¥í¥°¥é¥à ¤¬ -DPROCESS_OPTIONS ¤ò»ØÄꤷ¤ÆºîÀ®¤µ¤ì¤¿¤«¤É¤¦¤«¤Ëº¸±¦¤µ¤ì¤ë¡£

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ACCESS CONTROL FILES

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(daemon,client) ¤ÎÁȹ礻¤¬ /etc/hosts.allow ¥Õ¥¡¥¤¥ë¤ÎÃæ¤Î ¥¨¥ó¥È¥ê¤È°ìÃפ¹¤ë¾ì¹ç¡¢¥¢¥¯¥»¥¹¤Ï¾µÂú¤µ¤ì¤ë¡£

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ACCESS CONTROL RULES

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    daemon_list : client_list [ : shell_command ]

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PATTERNS

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ALL

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LOCAL

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UNKNOWN

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KNOWN

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PARANOID

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OPERATORS

EXCEPT

´ðËÜŪ¤Ë¤Ï¡¢¼¡¤Ë¼¨¤¹¤è¤¦¤Ê·Á¼°¤Ç»ÈÍѤ¹¤ë: `list_1 EXCEPT list_2';¤³¤ì¤Ï list_2 ¤Ë¥Þ¥Ã¥Á¤¹¤ë¤â¤Î¤ò½ü¤¯¡¢ list_1 ¤Ë¥Þ¥Ã¥Á¤¹¤ë¤â¤ÎÁ´¤Æ¡¢¤Ë¹çÃפ¹¤ë¡£¤³¤Î EXCEPT ±é»» »Ò¤Ï¡¢daemon_lists ¤È client_lists ¤ÎÃæ¤Ç¤â»ÈÍѤǤ­¤ë¡£EXCEPT ±é »»»Ò¤Ï¡¢¥Í¥¹¥È(Æþ¤ì»Ò¤Ë)¤·¤Æ»È¤¦»ö¤â¤Ç¤­¤ë: ¤â¤·¥³¥ó¥È¥í¡¼¥ë½ñ¼° ¤¬´Ý³ç¸Ì¤ò»È¤¦»ö¤òµö²Ä¤·¤Æ¤¤¤¿¤Ê¤é¡¢`a EXCEPT b EXCEPT c'¤Ï¡¢ `(a EXCEPT (b EXCEPT c))' ¤È²ò¼á¤µ¤ì¤ë¤Ç¤¢¤í¤¦¡£

SHELL COMMANDS

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¥·¥§¥ë¥³¥Þ¥ó¥É¤Ï¡¢inetd ¤Î PATH ÀßÄê¤È´ØÏ¢¤µ¤»¤Æ¤Ï¤¤¤±¤Ê¤¤¡£Âå¤ï ¤ê¤ËÀäÂХѥ¹¤òÍѤ¤¤ë¤«¡¢ËÁƬ¤ÇÌÀ¼¨Åª¤Ë PATH=whatever ¤òÀë¸À¤¹¤ë ¤Ù¤­¤Ç¤¢¤ë¡£

hosts_options(5) ¤Îʸ½ñ¤Ç¤Ï¡¢¸ß´¹À­¤Î¤Ê¤¤°Û¤Ê¤ëÊýË¡¤Ç¥·¥§ ¥ë¥³¥Þ¥ó¥É¤Î¥Õ¥£¡¼¥ë¥É¤ò»È¤¦¤¿¤á¤Î¡¢¤â¤¦¤Ò¤È¤Ä¤Î½ñ¼°¤ò²òÀ⤷¤Æ¤¤ ¤ë¡£

% EXPANSIONS

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%a (%A)

¥¯¥é¥¤¥¢¥ó¥È (¥µ¡¼¥Ð¡¼) ¥Û¥¹¥È¤Î¥¢¥É¥ì¥¹¡£

%c

¥¯¥é¥¤¥¢¥ó¥È¤Î¾ðÊó: user@host, user@address. ¥Û¥¹¥È̾¤«Ã±¤Ë¥¢¥É ¥ì¥¹¤«¤Ï¡¢ÍøÍѤǤ­¤ë¾ðÊó¤Ë°Í¸¤¹¤ë¡£

%d

¥Ç¡¼¥â¥ó¥×¥í¥»¥¹Ì¾ (argv[0] ¤ÎÃÍ)¡£

%h (%H)

¥¯¥é¥¤¥¢¥ó¥È (¥µ¡¼¥Ð¡¼) ¥Û¥¹¥È¤Î̾Á°¡¢¤â¤·¥Û¥¹¥È̾¤¬ÍøÍѤǤ­¤Ê¤¤ ¾ì¹ç¤Ë¤Ï¡¢¤½¤Î¥¢¥É¥ì¥¹¡£

%n (%N)

¥¯¥é¥¤¥¢¥ó¥È (¥µ¡¼¥Ð¡¼) ¥Û¥¹¥È¤Î̾Á° (¤â¤·¤¯¤Ï¡¢"unknown" ¤¢¤ë¤¤ ¤Ï "paranoid")¡£

%p

¥Ç¡¼¥â¥ó¥×¥í¥»¥¹¤Î id¡£

%s

¥µ¡¼¥Ð¡¼¤Î¾ðÊó: daemon@host, daemon@address, ¤¢¤ë¤¤¤Ïñ¤Ë¥Ç¡¼¥â ¥ó¤Î̾Á°¡£¤³¤ì¤ÏÍøÍѤǤ­¤ë¾ðÊó¤Ë°Í¸¤¹¤ë¡£

%u

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%%

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SERVER ENDPOINT PATTERNS

Àܳ¤µ¤ì¤Æ¤¤¤ë¥Í¥Ã¥È¥ï¡¼¥¯¥¢¥É¥ì¥¹¤Ë¤è¤Ã¤Æ¡¢¥¯¥é¥¤¥¢¥ó¥È¤ò¸·Ì©¤Ë ¶èÊ̤¹¤ë¤¿¤á¤Ë¤Ï¡¢°Ê²¼¤Î·Á¼°¤Ç¥Ñ¥¿¡¼¥ó¤òµ­½Ò¤¹¤ë:

    process_name@host_pattern : client_list ...

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host_pattern ¤Ï¡¢client_lists ¤Î²òÀâʸ¤Ë¤¢¤Ã¤¿¡¢¥Û¥¹¥È̾¤È¥¢¥É¥ì ¥¹¤Î¤è¤¦¤Ê¡¢¤¤¤¯¤Ä¤«¤Îʸˡ¤Ë½¾¤¦¤³¤È¤Ë¤Ê¤ë¡£°ìÈÌŪ¤Ë¤Ï¡¢server endpoint information (¥µ¡¼¥Ð¡¼Â¦Ëöü¤Ç¤Î¾ðÊó)¤Ï¡¢ connection-oriented serveices (¥³¥Í¥¯¥·¥ç¥ó»Ø¸þ¤Î¹â¤¤¥µ¡¼¥Ó¥¹)¤Ç ¤Î¤ßÍøÍѤ¹¤ë»ö¤¬¤Ç¤­¤ë¡£

CLIENT USERNAME LOOKUP

¥¯¥é¥¤¥¢¥ó¥È¥Û¥¹¥È¤¬ RFC 931 ¤«¡¢¤½¤³¤«¤éÇÉÀ¸¤·¤¿¥×¥í¥È¥³¥ë(TAP, IDENT, RFC 1413) ¤Î¤É¤ì¤«¤ò¥µ¥Ý¡¼¥È¤·¤Æ¤¤¤ë¾ì¹ç¡¢¥é¥Ã¥Ñ¡¼¥×¥í¥° ¥é¥à¤ÏÀܳ¤Î»ý¤Á¼ç¤Ë´Ø¤¹¤ë¡¢ÄɲäξðÊó¤ò°ú¤­½Ð¤¹»ö¤¬²Äǽ¤Ç¤¢¤ë¡£ ¥¯¥é¥¤¥¢¥ó¥È¥æ¡¼¥¶¡¼Ì¾¤Î¾ðÊó¤¬ÍøÍѲÄǽ¤Ç¤¢¤ë¤Ê¤é¡¢¤½¤ì¤Ï¥¯¥é¥¤¥¢ ¥ó¥È¤Î¥Û¥¹¥È̾¤È¤È¤â¤Ëµ­Ï¿¤µ¤ì¡¢¼¡¤Î¤è¤¦¤Ê¥Ñ¥¿¡¼¥ó¤Ë¥Þ¥Ã¥Á¤µ¤»¤ë ¤¿¤á¤Ë»È¤¦»ö¤¬¤Ç¤­¤ë:

    daemon_list : ... user_pattern@host_pattern ...

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    daemon_list : @pcnetgroup ALL@ALL

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DETECTING ADDRESS SPOOFING ATTACKS

¿¤¯¤Î TCP/IP ¤Î¼ÂÁõ¤Ë¸«¤é¤ì¤ë sequence number generator Ãæ¤Î·ç ´Ù¤Ï¡¢¿¯Æþ¼Ô¤¬¿®Íê¤Ç¤­¤ë¥Û¥¹¥È¤Ç¤¢¤ë¤³¤È¤ò´Êñ¤ËÁõ¤¤¡¢Î㤨¤Ð¥ê¥â¡¼ ¥È¥·¥§¥ë¥µ¡¼¥Ó¥¹¤òÄ̤·¤Æ²¡¤·Æþ¤ë¤³¤È¤òµö¤·¤Æ¤·¤Þ¤¦¡£IDENT (RFC931 ¤Û¤«) ¥µ¡¼¥Ó¥¹¤Ï¤½¤Î¤è¤¦¤Ê¥Û¥¹¥È¥¢¥É¥ì¥¹¤Î¥Ú¥Æ¥ó¤Ë¤è¤ë¹¶ ·â¤ò»¡ÃΤ¹¤ë¤¿¤á¤Ë»È¤¦»ö¤¬¤Ç¤­¤ë¡£

¥¯¥é¥¤¥¢¥ó¥È¤ÎÍ×µá¤ËÅú¤¨¤ëÁ°¤Ë¡¢TCP ¥é¥Ã¥Ñ¡¼·²¤ÏËÜÅö¤Î¥¯¥é¥¤¥¢¥ó ¥È¤¬¼ÂºÝ¤Ë¤ÏÁ´¤¯Í×µá¤òÁ÷¤Ã¤ÆÍè¤Æ¤¤¤Ê¤«¤Ã¤¿¤³¤È¤òȯ¸«¤¹¤ëÌÜŪ¤Ç¡¢ IDENT ¥µ¡¼¥Ó¥¹¤ò»È¤¦»ö¤¬¤Ç¤­¤ë¡£

¥¯¥é¥¤¥¢¥ó¥È¥Û¥¹¥È¤¬ IDENT ¥µ¡¼¥Ó¥¹¤òÍÑ°Õ¤·¤Æ¤¤¤ë¤Ê¤é¡¢IDENT ¤Î Ì䤤¹ç¤ï¤»¤ò¤·¤Æ¡¢Ê֤äÆÍ褿·ë²Ì¤¬ÈÝÄêŪ(¥¯¥é¥¤¥¢¥ó¥È¥Þ¥·¥ó¤¬ `UNKNOWN@host') ¤Ç¤¢¤ì¤Ð¡¢¤½¤ì¤Ï¥Ú¥Æ¥ó¹¶·â¤Î³Î¸Ç¤¿¤ë¾Úµò¤È¤Ê¤ë¡£

¹ÎÄêŪ¤Ê IDENT ¤ÎÌ䤤¹ç¤ï¤»·ë²Ì (¥¯¥é¥¤¥¢¥ó¥È¥Þ¥·¥ó¤Ï `KNOWN@host')¤Ç¤â¡¢½¼Ê¬¤Ë¿®Íê¤Ç¤­¤ë¤È¤Ï¸À¤¤ÀÚ¤ì¤Ê¤¤¡£Ã±¤Ë¥¯¥é¥¤ ¥¢¥ó¥È¤Î¥³¥Í¥¯¥·¥ç¥ó¤ò¸íËâ²½¤¹¤è¤ê¤ÏÆñ¤·¤¤¤¬¡¢¤½¤ì¤Ç¤â¿¯Æþ¼Ô¤Ï¥¯ ¥é¥¤¥¢¥ó¥È¤Î¥³¥Í¥¯¥·¥ç¥ó¤È¡¢IDENT ¤ÎÌ䤤¹ç¤ï¤»¤ÎξÊý¤òµ¶¤Ã¤Æ¤¤¤ë ²ÄǽÀ­¤¬¤¢¤ë¡£¤µ¤é¤Ë¤Ï¡¢¥¯¥é¥¤¥¢¥ó¥È¤Î IDENT ¥µ¡¼¥Ð¡¼¤½¤Î¤â¤Î¤¬ ±³¤ò¤Ä¤¤¤Æ¤¤¤ë¤³¤È¤µ¤¨¹Í¤¨¤é¤ì¤ë¡£

Note: IDENT ¤ÎÌ䤤¹ç¤ï¤»¤Ï UDP ¥µ¡¼¥Ó¥¹¤È¶¦Â¸¤·¤ÆÆ°ºî¤¹¤ë»ö¤Ï¤Ç¤­¤Ê¤¤¡£

EXAMPLES

ʸˡ¤ÏºÇ¾®¸Â¤Î¶ìÏ«¤Ç¡¢¤µ¤Þ¤¶¤Þ¤Ê¥¿¥¤¥×¤Î¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë¤¬É½ ¸½²Äǽ¤Ê¡¢½ÀÆð¤Ê¤â¤Î¤Ç¤¢¤ë¡£¤³¤Îʸˡ¤ÏÆó¤Ä¤Î¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë ¤Î¥ê¥¹¥È¤¬É¬ÍפʤΤÀ¤¬¡¢¿È¤â¥Õ¥¿¤â¤Ê¤¤Êýºö¤È¤·¤Æ¤Ï¡¢ÊÒÊý¤Î¥ê¥¹¥È ¤ò¶Ë¤á¤Æñ½ã¤Ê¤â¤Î¤È¤¹¤ë¤«¡¢¶õ¤Ë¤·¤Æ¤ª¤¯¤³¤È¤¬µó¤²¤é¤ì¤ë¡£

°Ê²¼¤Îµ­½ÒÎã¤òÆɤà¤Ë¤¢¤¿¤Ã¤Æ¤Ï¡¢allow ¤Îµ­½Ò¤Ï deny ¤Îµ­½Ò¤è¤êÀè ¤Ë¸¡º÷¤µ¤ì¡¢¤½¤Î¸¡º÷¤ÏºÇ½é¤Ë¥Þ¥Ã¥Á¤·¤¿¤â¤Î¤Ç½ªÎ»¤È¤Ê¤ê¡¢¥Þ¥Ã¥Á¤· ¤¿¤â¤Î¤¬Á´¤¯¸«¤Ä¤«¤é¤Ê¤¤¾ì¹ç¤Ë¤Ï¡¢¥¢¥¯¥»¥¹¤Ï¾µÇ§¤µ¤ì¤ë¡¢¤È¤¤¤¦¤³ ¤È¤ò¤Ï¤Ã¤­¤ê¤ÈÍý²ò¤·¤Æ¤ª¤¯¤³¤È¤¬½ÅÍפǤ¢¤ë¡£

µ­½ÒÎã¤Ï¥Û¥¹¥È¤È¥É¥á¥¤¥ó¤Î̾Á°¤ò»È¤¦¡£¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤Ø¤ÎÌ䤤¹ç¤ï ¤»¤¬°ì»þŪ¤Ë¼ºÇÔ¤·¤¿¾ì¹ç¤Î±Æ¶Á¤ò·Ú¸º¤¹¤ë¤¿¤á¤Ë¤Ï¡¢¤³¤ì¤é¤Ë¥¢¥É¥ì ¥¹¡¢¤«¤Ä¡¢¤¢¤ë¤¤¤Ï network/netmask ¤Î¾ðÊó¤ò´Þ¤á¤ë¤³¤È¤Ç¡¢²þÁ±¤¹ ¤ë»ö¤¬¤Ç¤­¤ë¡£

MOSTLY CLOSED (¤Û¤ÜÊĺ¿)

¤³¤Î¾ì¹ç¡¢¥¢¥¯¥»¥¹¤Ï¥Ç¥Õ¥©¥ë¥È¤ÇµñÀ䤵¤ì¤ë¡£ÌÀ¼¨Åª¤Ë¸¢¸Â¤ò¼ø¤±¤é ¤ì¤¿¥Û¥¹¥È¤Î¤ß¤¬¥¢¥¯¥»¥¹¤òµö¤µ¤ì¤ë¡£

¥Ç¥Õ¥©¥ë¥È¤Î¥Ý¥ê¥·¡¼(no access)¤Ï¡¢Ã±¤Ë deny file ¤ÎÃæ¤Çµ­½Ò¤µ¤ì ¤ë:

/etc/hosts.deny: ALL: ALL

¤³¤ì¤Ë¤è¤Ã¤Æ¡¢allow file ¤ÎÃæ¤Î¥¨¥ó¥È¥ê¤Ç¥¢¥¯¥»¥¹¤¬µö²Ä¤µ¤ì¤Ê¤¤ ¸Â¤ê¡¢Á´¤Æ¤Î¥Û¥¹¥È¤Ø¤Î¥µ¡¼¥Ó¥¹¤ÏµñÈݤȤʤ롣

ÌÀ¼¨Åª¤Ë¸¢¸Â¤ò¼ø¤±¤ë¥Û¥¹¥È¤Ï¡¢allow file ¤ÎÃæ¤Ç¥ê¥¹¥È¤µ¤ì¤ë¡£µ­ ½ÒÎã:

/etc/hosts.allow: ALL: LOCAL @some_netgroup
ALL: .foobar.edu EXCEPT terminalserver.foobar.edu

ºÇ½é¤Î¥ë¡¼¥ë¤Ç¤Ï¡¢¥í¡¼¥«¥ë¥É¥á¥¤¥ó(¥Û¥¹¥È̾¤Ë `.'¤òɬÍפȤ·¤Ê¤¤) ¤È¡¢some_netgroup ¤Ë°¤¹¤ë¥Û¥¹¥È¤«¤é¤Î¥¢¥¯¥»¥¹¤¬µö²Ä¤µ¤ì¤Æ ¤¤¤ë¡£ÆóÈÖÌܤΥ롼¥ë¤Ç¤Ï¡¢terminalserver.foobar.edu. ¤ò½ü ¤¯foobar.edu ¥É¥á¥¤¥ó(¥É¥Ã¥È¤Ç»Ï¤Þ¤ë¤³¤È¤¬Àë¸À¤µ¤ì¤Æ¤¤¤ë) ¤Î¡¢Á´¤Æ¤Î¥Û¥¹¥È¤«¤é¤Î¥¢¥¯¥»¥¹¤¬µö²Ä¤µ¤ì¤Æ¤¤¤ë¡£

MOSTLY OPEN (¤Û¤Ü²òÊü)

ÌÀ¼¨Åª¤Ë¥µ¡¼¥Ó¥¹¤òµñÈݤ¹¤ë¥Û¥¹¥È¤ò½ü¤­¡¢¥¢¥¯¥»¥¹¤Ï¥Ç¥Õ¥©¥ë¥È¤Çµö ²Ä¤È¤Ê¤ë¡£

¥Ç¥Õ¥©¥ë¥È¤Î¥Ý¥ê¥·¡¼(access granted) ¤Ë½¾¤¨¤Ð¡¢¤É¤ó¤Ê allow file ¤Ç¤â¡¢¤Þ¤Ã¤¿¤¯¾Êά²Äǽ¤Ê¤Û¤É¾éĹ¤Ê¤â¤Î¤È¤Ê¤ë¡£ÌÀ¼¨Åª¤Ë¸¢¸Â¤òÍ¿¤¨ ¤Ê¤¤¥Û¥¹¥È¤Ï¡¢deny file ¤Ë¥ê¥¹¥È¤¹¤ë¡£µ­½ÒÎã:

/etc/hosts.deny: ALL: some.host.name, .some.domain
ALL EXCEPT in.fingerd: other.host.name, .other.domain

ºÇ½é¤Î¥ë¡¼¥ë¤Ç¤Ï¡¢¤¤¤¯¤Ä¤«¤Î¥Û¥¹¥È¤È¡¢¥É¥á¥¤¥ó¤Ø¤ÎÁ´¤Æ¤Î¥µ¡¼¥Ó¥¹ ¤¬µñÈݤµ¤ì¤ë¡£ÆóÈÖÌܤΥ롼¥ë¤Ç¤Ï¡¢¤½¤ì°Ê³°¤Î¥Û¥¹¥È¤È¥É¥á¥¤¥ó¤«¤é ¤Î finger ¥ê¥¯¥¨¥¹¥È¤Ë¸Â¤Ã¤Æµö²Ä¤¬Í¿¤¨¤é¤ì¤Æ¤¤¤ë¡£

BOOBY TRAPS (¤Ò¤Ã¤«¤±æ«)

¼¡¤Î¥µ¥ó¥×¥ë¤Ï¥í¡¼¥«¥ë¥É¥á¥¤¥ó¤Î¥Û¥¹¥È(¥É¥Ã¥È¤Ç»Ï¤Þ¤ë»ö¤¬Àë¸À¤µ ¤ì¤Æ¤¤¤ë)¤«¤é¤Î tftp ¥ê¥¯¥¨¥¹¥È¤òµö²Ä¤¹¤ë¤â¤Î¤Ç¤¢¤ë¡£¤½¤ì°Ê³°¤Î ¥Û¥¹¥È¤«¤é¤Î¥ê¥¯¥¨¥¹¥È¤ÏµñÈݤµ¤ì¤ë¡£¤½¤·¤ÆÍ׵ᤵ¤ì¤¿¥Õ¥¡¥¤¥ë¤ÎÂå ¤ï¤ê¤Ë¡¢finger ¤Îõ¤ê¿Ë¤¬¤½¤Î̵Îé¤Ê¤ë¥Û¥¹¥È¤Ø¤ÈÊü¤¿¤ì¤ë¡£·ë²Ì¤Ï ¥¹¡¼¥Ñ¡¼¥æ¡¼¥¶¡¼¤Ø¥á¥¤¥ë¤ÇÁ÷¤é¤ì¤ë¡£

/etc/hosts.allow:

in.tftpd: LOCAL, .my.domain



/etc/hosts.deny:

in.tftpd: ALL: (/some/where/safe_finger -l @%h | \

        /usr/ucb/mail -s %d-%h root) &

safe_finger ¥³¥Þ¥ó¥É¤Ï tcpd wrapper ¤ËÉÕ°¤·¤Æ¤ª¤ê¡¢Å¬Àڤʾì½ê¤Ë ¥¤¥ó¥¹¥È¡¼¥ë¤µ¤ì¤ë¤Ù¤­¤Ç¤¢¤ë¡£¤³¤ì¤Ï¥ê¥â¡¼¥È¤Î finger ¥µ¡¼¥Ð¡¼¤« ¤éÁ÷¤é¤ì¤Æ¤¯¤ë¥Ç¡¼¥¿¤Ë¤è¤Ã¤Æ¥À¥á¡¼¥¸¤¬Í¿¤¨¤é¤ì¤ë²ÄǽÀ­¤òÀ©¸Â¤·¤Æ ¤ë¡£¤³¤ì¤Ïɸ½à¤Î finger ¥³¥Þ¥ó¥É¤è¤ê¤âÍ¥¤ì¤¿Ëɸæ¤ò¤â¤¿¤é¤¹¡£

%h (client host) ¤È %d (service name) ¤ÎŸ³«¤Ë¤Ä¤¤¤Æ¤Ï¡¢shell commands ¤Î¥»¥¯¥·¥ç¥ó¤Ç²òÀ⤵¤ì¤Æ¤¤¤ë¡£

·Ù¹ð: finger ¤Î̵¸Â¥ë¡¼¥×¤Ø¤ÎÂн褬¤Ç¤­¤Ê¤¤¤Ê¤é¡¢¤¢¤Ê¤¿¼«¿È¤Î finger ¥Ç¡¼¥â¥ó¤ËÂФ·¤Æ¡¢¤³¤Î booby-trap (°ú¤Ã¤«¤±æ«) ¤ò»Å³Ý¤±¤Ê ¤¤»ö¡£

¥Í¥Ã¥È¥ï¡¼¥¯¥Õ¥¡¥¤¥ä¡¼¥¦¥©¡¼¥ë¤Ë¤ª¤¤¤Æ¤Ï¡¢¤³¤Î¥È¥ê¥Ã¥¯¤Ï¤µ¤é¤ËÂç Éý¤Ë³ÈÄ¥¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£Åµ·¿Åª¤Ê¥Í¥Ã¥È¥ï¡¼¥¯¥Õ¥¡¥¤¥ä¡¼¥¦¥©¡¼¥ë ¤Ï¡¢³°Éô¤ËÂФ·¤Æ¸ÂÄꤵ¤ì¤¿¥µ¡¼¥Ó¥¹¤·¤«Ä󶡤·¤Ê¤¤¡£¤½¤ì°Ê³°¤Î¥µ¡¼ ¥Ó¥¹¤Ï¡¢¾åµ­¤Î tftp ¤ÎÎã¤Î¤è¤¦¤Ë "ÅðÄ°" ¤¹¤ë¤³¤È¤¬¤Ç¤­¤ë¡£¤½¤Î·ë ²Ì¡¢¶Ë¤á¤ÆÍ¥¤ì¤¿Áá´ü·Ù²üÁõÃ֤Ȥʤ롣

DIAGNOSTICS

°Ê²¼¤Î¾ì¹ç¤Ë¥¨¥é¡¼¤¬Êó¹ð¤µ¤ì¤ë¡£¥Û¥¹¥È¥³¥ó¥È¥í¡¼¥ë¥Õ¥¡¥¤¥ë¤Ëʸˡ ¥¨¥é¡¼¤¬¸«¤Ä¤«¤Ã¤¿¾ì¹ç¡£¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë¤Î¥ë¡¼¥ë¤ÎŤµ¤¬ÆâÉô ¤Î¥Ð¥Ã¥Õ¥¡¤ÎÍÆÎ̤ò±Û¤¨¤¿¾ì¹ç¡£¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë¤Î¥ë¡¼¥ë¤¬¡¢²þ ¹Ôʸ»ú¤Ë¤è¤Ã¤Æ½ª¤ï¤Ã¤Æ¤¤¤Ê¤¤¾ì¹ç¡£%<letter> Ÿ³«¤Î·ë²Ì¡¢ÆâÉô¥Ð¥Ã ¥Õ¥¡¤¬°î¤ì¤Æ¤·¤Þ¤Ã¤¿¾ì¹ç¡£´üÂÔ¤ËÈ¿¤·¤Æ¡¢¥·¥¹¥Æ¥à¥³¡¼¥ë¤¬¼ºÇÔ¤·¤¿ ¾ì¹ç¡£¤¹¤Ù¤Æ¤ÎÌäÂê¤Ï¡¢syslog ¥Ç¡¼¥â¥ó¤òÄ̤¸¤ÆÊó¹ð¤µ¤ì¤ë¡£

FILES

/etc/hosts.allow, ¥¢¥¯¥»¥¹¤òµö²Ä¤¹¤ë (daemon,client) ¤Î¥Ú¥¢¡£

/etc/hosts.deny, ¥¢¥¯¥»¥¹¤òµñÈݤ¹¤ë (daemon,client) ¤Î¥Ú¥¢¡£

SEE ALSO

tcpd(8) tcp/ip daemon wrapper ¥×¥í¥°¥é¥à

tcpdchk(8), tcpdmatch(8), test programs.

 

BUGS

¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤ÎÌ䤤¹ç¤ï¤»¤¬¥¿¥¤¥à¥¢¥¦¥È¤È¤Ê¤ë¤È¡¢¥Û¥¹¥È̾¤Ï¡¢¤¿ ¤È¤¨ÅÐÏ¿¤µ¤ì¤Æ¤¤¤Æ¤â¡¢¥¢¥¯¥»¥¹¥³¥ó¥È¥í¡¼¥ë¥½¥Õ¥È¤«¤é¤ÏÍøÍѤǤ­¤Ê ¤¤¡£

¥É¥á¥¤¥ó¥Í¡¼¥à¥µ¡¼¥Ð¡¼¤ÎÌ䤤¹ç¤ï¤»¤Ï¡¢Âçʸ»ú¾®Ê¸»ú¤òƱ°ì»ë¤¹¤ë¡£ °ìÊý NIS (¤«¤Ä¤Æ¤Î YP) ¤Î¥Í¥Ã¥È¥°¥ë¡¼¥×¤Ï¡¢Âçʸ»ú¾®Ê¸»ú¤ò¶èÊ̤¹ ¤ë¡£

AUTHOR

Wietse Venema (wietse@wzv.win.tue.nl)

Department of Mathematics and Computing Science

Eindhoven University of Technology

Den Dolech 2, P.O. Box 513, 

5600 MB Eindhoven, The Netherlands

 

ËÝÌõ¼Ô

FUKUSHIMA Osamu/Ê¡Åç±÷½¤ <fuku@amorph.rim.or.jp>