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Kerberos + X.500 for Secure Initial Network-wide Login

Kerberos + X.500 for Secure Initial Network-wide Login. Ann, pswd A. X.500 DDS. KDS. Client. logon(Ann). GenerateS A at random; Get K A =hash(pwsd) from X.500 DDS; TGT = K KDS {A, S A }. K A =hash(pwsd);. stores user acct. DB + secret keys+ other attributes. LDAP. A nn.

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Kerberos + X.500 for Secure Initial Network-wide Login

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  1. Kerberos + X.500 for Secure Initial Network-wide Login Ann, pswdA X.500 DDS KDS Client logon(Ann) GenerateSA at random; Get KA=hash(pwsd) from X.500 DDS; TGT = KKDS{A, SA} KA=hash(pwsd); stores user acct. DB + secret keys+ other attributes LDAP Ann KA{SA, TGT} Cache SA, TGT; Delete KA Also stores attributes: tGTLifetime, krbMasterKey, sessionLifetime, in user account.

  2. Kerberos + X.500 for Secure Network-wide Login + Application KDS X.500 DDS Ann, passwdA logon(Ann, passwordA) Can get userID and password of all principals. Generates TGT and session tickets. Client stores user acct. DB + other attributes Wants to do remote app. on Bryan Here’s TGT LDAP Ann Needs session tkt for Bryan Here’s session tkt for Bryan Ann’s Workstation caches TGT and session ticket Ann wants to talk to you; Here is the session tkt App Server Bryan gets verifies session tkt. OK

  3. Kerberos Tickets • TICKET, NAME, AUTHENTICATOR • Ticket consists of ? • { s, c, addr, created timestamp, lifetime, Ks,c }Ks • Note: Ks,c is the session key; The entire ticket is encrypted with Ks, the server key, because it is destined for the TGS. • Names look like? • Name.instance@realm • ghansah.gaia@csus.edu • ghansah.root@csus.edu (domain wide root) • Authenticator consists of? • { c, addr, timestamp } Ks,c • The authenticator is shorter than a ticket and is, therefore, preferred for performance reasons by the client when sending messages. The timestamp is a nonce.

  4. Kerberos + X.500 for Secure Network-wide Login + Application - TECH. DETAILS KDS X.500 DDS Ann, passwdA Ann needs TGT Knows KA = f(passwdA) Invents SA. TGT = KKDS{A, SA} Invents KA-B tktB=KB{A,KA-B} Client stores user acct. DB eg. passwdA rlogin, ftp, telnet Bryan KA{SA, TGT} LDAP Ann TGT, SA{t} SA{B,KA-B, tktB} Ann’s Workstation App Server tktB, KA-B{t} Bryan gets KA-B Verifies t, .. KA-B{t+1}

  5. KDS X.500 DDS Ann, passwdA Get KPubA from X.500 DDS; Verify SIG; Send TGT. Generates TGT and session tickets. Client logon(Ann),SIG stores user acct. DB + Public Key Certs. + other attributes Wants to do remote app. on Bryan Here’s TGT LDAP Ann Needs session tkt for Bryan Here’s session tkt for Bryan Ann’s Workstation caches TGT and session ticket CA Ann wants to talk to you; Here is the session tkt App Server Bryan gets, verifies session tkt. Issues Certs OK To Ann Kerberos + X.500 + Public Key for Secure Network-wide Login + Application

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