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[KYUUBI #7265] Recommend to configure kyuubi.session.local.dir.allowlist for multi-tenant clusters #7269

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[KYUUBI #7265] Recommend to configure kyuubi.session.local.dir.allowlist for multi-tenant clusters #7269

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[KYUUBI #7265] Recommend to configure kyuubi.session.local.dir.allow.…
aajisaka Dec 8, 2025
477ad75
Fix scalastyle check
aajisaka Dec 10, 2025
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3 changes: 3 additions & 0 deletions docs/security/kinit.md
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Expand Up @@ -101,6 +101,9 @@ hadoop.proxyuser.<user name in principal>.groups *
hadoop.proxyuser.<user name in principal>.hosts *
```

Also, you must configure `kyuubi.session.local.dir.allow.list` to exclude your Kyuubi server's keytab and any other credential from the local directories.
Otherwise, any user who can login to the Kyuubi server via Kyuubi frontend protocols is possible to obtain the keytab and to impersonate the users configured by Hadoop proxy user settings.

## Further Readings

- [Hadoop in Secure Mode](https://hadoop.apache.org/docs/current/hadoop-project-dist/hadoop-common/SecureMode.html)
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6 changes: 6 additions & 0 deletions kyuubi-server/src/main/scala/org/apache/kyuubi/server/KinitAuxiliaryService.scala
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Expand Up @@ -44,6 +44,12 @@ class KinitAuxiliaryService() extends AbstractService("KinitAuxiliaryService") {
kinitMaxAttempts = conf.get(KyuubiConf.KINIT_MAX_ATTEMPTS)

require(keytab.nonEmpty && principal.nonEmpty, "principal or keytab is missing")
if (conf.get(KyuubiConf.ENGINE_DO_AS_ENABLED) &&
conf.get(KyuubiConf.SESSION_LOCAL_DIR_ALLOW_LIST).isEmpty) {
warn(s"User impersonation is enabled, but ${KyuubiConf.SESSION_LOCAL_DIR_ALLOW_LIST}" +
" is unset. We strongly recommend to configure the allowed local dir list" +
" to exclude any credential including keytab.")
}
UserGroupInformation.loginUserFromKeytab(principal.get, keytab.get)
val krb5Conf = Option(System.getProperty("java.security.krb5.conf"))
.orElse(Option(System.getenv("KRB5_CONFIG")))
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