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The MIT Kerberos Team announces the availability of MIT Kerberos 5
Release 1.16. Please see below for a list of some major changes
included, or consult the README file in the source tree for a more
detailed list of significant changes.
RETRIEVING KERBEROS 5 RELEASE 1.16
You may retrieve the Kerberos 5 Release 1.16 source from the
(The distribution URL has changed from previous releases. The same
contents are available at the old URL.)
The homepage for the krb5-1.16 release is:
Further information about Kerberos 5 may be found at the following
and at the MIT Kerberos Consortium web site:
The Data Encryption Standard (DES) is widely recognized as weak. The
krb5-1.7 release contains measures to encourage sites to migrate away
- - From using single-DES cryptosystems. Among these is a configuration
variable that enables "weak" enctypes, which defaults to "false"
beginning with krb5-1.8.
Major changes in 1.16 (2017-12-05)
* The KDC can match PKINIT client certificates against the
"pkinit_cert_match" string attribute on the client principal entry,
using the same syntax as the existing "pkinit_cert_match" profile
* The ktutil addent command supports the "-k 0" option to ignore the
key version, and the "-s" option to use a non-default salt string.
* kpropd supports a --pid-file option to write a pid file at startup,
when it is run in standalone mode.
* The "encrypted_challenge_indicator" realm option can be used to
attach an authentication indicator to tickets obtained using FAST
encrypted challenge pre-authentication.
* Localization support can be disabled at build time with the
--disable-nls configure option.
* The kdcpolicy pluggable interface allows modules control whether
tickets are issued by the KDC.
* The kadm5_auth pluggable interface allows modules to control whether
kadmind grants access to a kadmin request.
* The certauth pluggable interface allows modules to control which
PKINIT client certificates can authenticate to which client
* KDB modules can use the client and KDC interface IP addresses to
determine whether to allow an AS request.
* GSS applications can query the bit strength of a krb5 GSS context
using the GSS_C_SEC_CONTEXT_SASL_SSF OID with
* GSS applications can query the impersonator name of a krb5 GSS
credential using the GSS_KRB5_GET_CRED_IMPERSONATOR OID with
* kdcpreauth modules can query the KDC for the canonicalized requested
client principal name, or match a principal name against the
requested client principal name with canonicalization.
* The client library will continue to try pre-authentication
mechanisms after most failure conditions.
* The KDC will issue trivially renewable tickets (where the renewable
lifetime is equal to or less than the ticket lifetime) if requested
by the client, to be friendlier to scripts.
* The client library will use a random nonce for TGS requests instead
of the current system time.
* For the RC4 string-to-key or PAC operations, UTF-16 is supported
(previously only UCS-2 was supported).
* When matching PKINIT client certificates, UPN SANs will be matched
correctly as UPNs, with canonicalization.
* Dates after the year 2038 are accepted (provided that the platform
time facilities support them), through the year 2106.
* Automatic credential cache selection based on the client realm will
take into account the fallback realm and the service hostname.
* Referral and alternate cross-realm TGTs will not be cached, avoiding
some scenarios where they can be added to the credential cache
* A German translation has been added.
* The build is warning-clean under clang with the configured warning
* The automated test suite runs cleanly under AddressSanitizer.
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