You are viewing a plain text version of this content. The canonical link for it is here.
Posted to dev@directory.apache.org by "Attila Sasvari (JIRA)" <ji...@apache.org> on 2017/04/11 16:49:41 UTC
[jira] [Updated] (DIRKRB-621) 0x502 version keytab with multiple
entries are not read properly
[ https://issues.apache.org/jira/browse/DIRKRB-621?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Attila Sasvari updated DIRKRB-621:
----------------------------------
Attachment: DIRKRB-621-00.patch
binary patch with a test case to illustrate the problem
> 0x502 version keytab with multiple entries are not read properly
> ----------------------------------------------------------------
>
> Key: DIRKRB-621
> URL: https://issues.apache.org/jira/browse/DIRKRB-621
> Project: Directory Kerberos
> Issue Type: Bug
> Reporter: Attila Sasvari
> Attachments: DIRKRB-621-00.patch, test_multiple_entries.keytab
>
>
> I have a version 0x502 keytab that contains multiple principles with multiple entries.
> {code}
> [root@65027d995418 /]# klist -ket test.keytab
> Keytab name: FILE:test.keytab
> KVNO Timestamp Principal
> ---- ----------------- --------------------------------------------------------
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (aes256-cts-hmac-sha1-96)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (aes128-cts-hmac-sha1-96)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (des3-cbc-sha1)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (arcfour-hmac)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (camellia256-cts-cmac)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (camellia128-cts-cmac)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (des-hmac-sha1)
> 3 04/11/17 14:16:34 test/examples.com@EXAMPLE.COM (des-cbc-md5)
> 3 04/11/17 14:16:51 HTTP/examples.com@EXAMPLE.COM (aes256-cts-hmac-sha1-96)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (aes128-cts-hmac-sha1-96)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (des3-cbc-sha1)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (arcfour-hmac)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (camellia256-cts-cmac)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (camellia128-cts-cmac)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (des-hmac-sha1)
> 3 04/11/17 14:16:52 HTTP/examples.com@EXAMPLE.COM (des-cbc-md5)
> {code}
> {{org.apache.kerby.kerberos.kerb.keytab.KeyTab}} readEntry() is only able to read the first entry properly.
> On https://web.mit.edu/kerberos/krb5-1.12/doc/formats/keytab_file_format.html, we can read the following:
> {quote}
> Some implementations of Kerberos recognize a 32-bit key version at the end of an entry, if the record length is at least 4 bytes longer than the entry and the value of those 32 bits is not 0. If present, this key version supersedes the 8-bit key version.
> {quote}
> Looking at https://www.gnu.org/software/shishi/manual/html_node/The-Keytab-Binary-File-Format.html,
> it seems {{uint32_t vno; /* only present if >= 4 bytes left in entry */}} is not handled in the [load()|https://github.com/apache/directory-kerby/blob/8483322e58310ff33685a1f3893b71e7cf5f246f/kerby-kerb/kerb-util/src/main/java/org/apache/kerby/kerberos/kerb/keytab/KeytabEntry.java#L40] method of {{org.apache.kerby.kerberos.kerb.keytab.KeytabEntry}}.
> With the example keytab I generated, this is exactly the case. We need to read an additional in order to properly read in the entries for the principals.
> Additional info:
> Kerberos packages I installed on centos-release-7-3
> {noformat}
> krb5-devel.x86_64 1.14.1-27.el7_3
> krb5-libs.x86_64 1.14.1-27.el7_3
> krb5-server.x86_64 1.14.1-27.el7_3
> krb5-workstation.x86_64 1.14.1-27.el7_3
> {noformat}
--
This message was sent by Atlassian JIRA
(v6.3.15#6346)