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いろいろなユーザー名

Last updated at Posted at 2017-05-25
名前の例 説明 使われる場所 RFC
username@domain.example.com メールアドレス RFC5322 (Google翻訳)
username@realm.example.com Network Access Identifier (NAI) RADIUSなど RFC7542 (Google翻訳)
NETBIOS-NAME\USERNAME NTドメイン、Active Directory
username@upn-suffix.example.com User Principal Name (UPN) Active Directory
UID=jsmith,DC=example,DC=net Distinguished Name (DN) LDAP RFC4514 (Google翻訳)

メールアドレス

RFC5322 Section 3.4.1 (Google翻訳) のaddr-specの定義より抜粋します。

   addr-spec       =   local-part "@" domain

   local-part      =   dot-atom / quoted-string / obs-local-part

   domain          =   dot-atom / domain-literal / obs-domain

   domain-literal  =   [CFWS] "[" *([FWS] dtext) [FWS] "]" [CFWS]

   dtext           =   %d33-90 /          ; Printable US-ASCII
                       %d94-126 /         ;  characters not including
                       obs-dtext          ;  "[", "]", or "\"

FWSはfolding white space, CFWSはコメントやFWSが発生する場所を表します。以下RFC5322 Section 3.2.2 (Google翻訳) より抜粋します。

   FWS             =   ([*WSP CRLF] 1*WSP) /  obs-FWS
                                          ; Folding white space

   ctext           =   %d33-39 /          ; Printable US-ASCII
                       %d42-91 /          ;  characters not including
                       %d93-126 /         ;  "(", ")", or "\"
                       obs-ctext

   ccontent        =   ctext / quoted-pair / comment

   comment         =   "(" *([FWS] ccontent) [FWS] ")"

   CFWS            =   (1*([FWS] comment) [FWS]) / FWS

NAI

RFC7542 Section 2.2 (Google翻訳) のnaiの定義より抜粋します。

   nai            =   utf8-username
   nai            =/  "@" utf8-realm
   nai            =/  utf8-username "@" utf8-realm

   utf8-username  =  dot-string

   dot-string     = string *("." string)
   string         = 1*utf8-atext

   utf8-atext     =  ALPHA / DIGIT /
                     "!" / "#" /
                     "$" / "%" /
                     "&" / "'" /
                     "*" / "+" /
                     "-" / "/" /
                     "=" / "?" /
                     "^" / "_" /
                     "`" / "{" /
                     "|" / "}" /
                     "~" /
                     UTF8-xtra-char

   utf8-realm     =  1*( label "." ) label

   label          =  utf8-rtext *(ldh-str)
   ldh-str        =  *( utf8-rtext / "-" ) utf8-rtext
   utf8-rtext     =  ALPHA / DIGIT / UTF8-xtra-char

ちょっとずつ定義が違いますが、Active Directoryを使っている環境では、ここに出て来るのが全部出てきて複雑なことになりがちです。幸運を祈る。

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