About
Configures the server principal name for the host or service in active directory Domain Services (AD DS) and generates a .keytab file that contains the shared secret key of the service.
The Ktpass command-line tool allows non-Windows services that support Kerberos authentication to use the interoperability features provided by the Kerberos Key Distribution Center (KDC) service.
Articles Related
Example
- Generate keytab in the current working directory.
ktpass -out <file>.keytab -mapuser <username>@REALM-IN-CAPS -pass <of-user> -crypto all -ptype KRB5_NT_PRINCIPAL -princ spn-of-user@REALM-IN-CAPS
Usage
Command line options:
---------------------most useful args
[- /] out : Keytab to produce
[- /] princ : Principal name (user@REALM)
[- /] pass : password to use
use '*' to prompt for password.
[- +] rndPass : ... or use +rndPass to generate a random password
[- /] minPass : minimum length for random password (def:15)
[- /] maxPass : maximum length for random password (def:256)
---------------------less useful stuff
[- /] mapuser : map princ (above) to this user account (default: don't)
[- /] mapOp : how to set the mapping attribute (default: add it)
[- /] mapOp : is one of:
[- /] mapOp : add : add value (default)
[- /] mapOp : set : set value
[- +] DesOnly : Set account for des-only encryption (default:don't)
[- /] in : Keytab to read/digest
---------------------options for key generation
[- /] crypto : Cryptosystem to use
[- /] crypto : is one of:
[- /] crypto : DES-CBC-CRC : for compatibility
[- /] crypto : DES-CBC-MD5 : for compatibility
[- /] crypto : RC4-HMAC-NT : default 128-bit encryption
[- /] crypto : AES256-SHA1 : AES256-CTS-HMAC-SHA1-96
[- /] crypto : AES128-SHA1 : AES128-CTS-HMAC-SHA1-96
[- /] crypto : All : All supported types
[- /] IterCount : Iteration Count used for AES encryption
Default: ignored for non-AES, 4096 for AES
[- /] ptype : principal type in question
[- /] ptype : is one of:
[- /] ptype : KRB5_NT_PRINCIPAL : The general ptype-- recommended
[- /] ptype : KRB5_NT_SRV_INST : user service instance
[- /] ptype : KRB5_NT_SRV_HST : host service instance
[- /] ptype : KRB5_NT_SRV_XHST :
[- /] kvno : Override Key Version Number
Default: query DC for kvno. Use /kvno 1 for Win2K compat.
[- +] Answer : +Answer answers YES to prompts. -Answer answers NO.
[- /] Target : Which DC to use. Default:detect
[- /] RawSalt : raw salt to use when generating key (not needed)
[- +] DumpSalt : show us the MIT salt being used to generate the key
[- +] SetUpn : Set the UPN in addition to the SPN. Default DO.
[- +] SetPass : Set the user's password if supplied.
installation
- Not needed on windows
C:\Windows\System32\ktpass.exe
- generally available on Linux