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kerberos.rs
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use snafu::{ResultExt, Snafu};
use stackable_hdfs_crd::{
constants::{SSL_CLIENT_XML, SSL_SERVER_XML},
HdfsCluster,
};
use stackable_operator::kube::{runtime::reflector::ObjectRef, ResourceExt};
use crate::config::{CoreSiteConfigBuilder, HdfsSiteConfigBuilder};
type Result<T, E = Error> = std::result::Result<T, E>;
#[derive(Snafu, Debug)]
#[allow(clippy::enum_variant_names)]
pub enum Error {
#[snafu(display("object has no namespace"))]
ObjectHasNoNamespace {
source: stackable_hdfs_crd::Error,
obj_ref: ObjectRef<HdfsCluster>,
},
}
impl HdfsSiteConfigBuilder {
pub fn security_config(&mut self, hdfs: &HdfsCluster) -> &mut Self {
if hdfs.has_kerberos_enabled() {
self.add("dfs.block.access.token.enable", "true")
.add("dfs.http.policy", "HTTPS_ONLY")
.add("hadoop.kerberos.keytab.login.autorenewal.enabled", "true")
.add("dfs.https.server.keystore.resource", SSL_SERVER_XML)
.add("dfs.https.client.keystore.resource", SSL_CLIENT_XML);
self.add_wire_encryption_settings();
}
self
}
pub fn security_discovery_config(&mut self, hdfs: &HdfsCluster) -> &mut Self {
if hdfs.has_kerberos_enabled() {
// We want e.g. hbase to automatically renew the Kerberos tickets.
// This shouldn't harm any other consumers.
self.add("hadoop.kerberos.keytab.login.autorenewal.enabled", "true");
self.add_wire_encryption_settings();
}
self
}
fn add_wire_encryption_settings(&mut self) -> &mut Self {
self.add("dfs.data.transfer.protection", "privacy");
self.add("dfs.encrypt.data.transfer", "true");
self
}
}
impl CoreSiteConfigBuilder {
pub fn security_config(&mut self, hdfs: &HdfsCluster) -> Result<&mut Self> {
if hdfs.authentication_config().is_some() {
let principal_host_part = principal_host_part(hdfs)?;
self.add("hadoop.security.authentication", "kerberos")
// Not adding hadoop.registry.kerberos.realm, as it seems to not be used by our customers
// and would need text-replacement of the env var anyway.
// .add("hadoop.registry.kerberos.realm", "${env.KERBEROS_REALM}")
.add(
"dfs.journalnode.kerberos.principal",
format!("jn/{principal_host_part}"),
)
.add(
"dfs.journalnode.kerberos.internal.spnego.principal",
format!("jn/{principal_host_part}"),
)
.add(
"dfs.namenode.kerberos.principal",
format!("nn/{principal_host_part}"),
)
.add(
"dfs.datanode.kerberos.principal",
format!("dn/{principal_host_part}"),
)
.add(
"dfs.web.authentication.kerberos.principal",
format!("HTTP/{principal_host_part}"),
)
.add("dfs.journalnode.keytab.file", "/stackable/kerberos/keytab")
.add("dfs.namenode.keytab.file", "/stackable/kerberos/keytab")
.add("dfs.datanode.keytab.file", "/stackable/kerberos/keytab")
.add(
"dfs.journalnode.kerberos.principal.pattern",
format!("jn/{principal_host_part}"),
)
.add(
"dfs.namenode.kerberos.principal.pattern",
format!("nn/{principal_host_part}"),
);
if !hdfs.has_authorization_enabled() {
// In case *no* OPA authorizer is used, we got the following error message:
// java.io.IOException: No groups found for user nn
// In case the OPA authorizer is used everything seems to be fine.
// The default value is `dr.who=`, so we include that here.
self.add(
"hadoop.user.group.static.mapping.overrides",
"dr.who=;nn=;nm=;jn=;",
);
}
self.add_wire_encryption_settings();
}
Ok(self)
}
pub fn security_discovery_config(&mut self, hdfs: &HdfsCluster) -> Result<&mut Self> {
if hdfs.has_kerberos_enabled() {
let principal_host_part = principal_host_part(hdfs)?;
self.add("hadoop.security.authentication", "kerberos")
.add(
"dfs.journalnode.kerberos.principal",
format!("jn/{principal_host_part}"),
)
.add(
"dfs.namenode.kerberos.principal",
format!("nn/{principal_host_part}"),
)
.add(
"dfs.datanode.kerberos.principal",
format!("dn/{principal_host_part}"),
);
self.add_wire_encryption_settings();
}
Ok(self)
}
fn add_wire_encryption_settings(&mut self) -> &mut Self {
self.add("hadoop.rpc.protection", "privacy");
self
}
}
/// For a long time we tried using `_HOST` in principals, e.g. `jn/_HOST@REALM.COM`.
/// Turns out there are a lot of code paths that check the principal of the requester using a reverse lookup of the incoming IP address
/// and getting a different hostname than the principal has.
/// What ultimately killed this approach was
///
/// ```text
/// 2023-05-30 09:23:01,745 ERROR namenode.EditLogInputStream (EditLogFileInputStream.java:nextOpImpl(220)) - caught exception initializing https://hdfs-journalnode-default-1.hdfs-journalnode-default.kuttl-test-fine-rat.svc.cluster.local:8481/getJournal?jid=hdfs&segmentTxId=1&storageInfo=-65%3A595659877%3A1685437352616%3ACID-90c52400-5b07-49bf-bdbe-3469bbdc5ebb&inProgressOk=true
/// org.apache.hadoop.hdfs.server.common.HttpGetFailedException: Fetch of https://hdfs-journalnode-default-1.hdfs-journalnode-default.kuttl-test-fine-rat.svc.cluster.local:8481/getJournal?jid=hdfs&segmentTxId=1&storageInfo=-65%3A595659877%3A1685437352616%3ACID-90c52400-5b07-49bf-bdbe-3469bbdc5ebb&inProgressOk=true failed with status code 403
/// Response message:
/// Only Namenode and another JournalNode may access this servlet
/// ```
///
/// After we have switched to using the following principals everything worked without problems
fn principal_host_part(hdfs: &HdfsCluster) -> Result<String> {
let hdfs_name = hdfs.name_any();
let hdfs_namespace = hdfs
.namespace_or_error()
.with_context(|_| ObjectHasNoNamespaceSnafu {
obj_ref: ObjectRef::from_obj(hdfs),
})?;
Ok(format!(
"{hdfs_name}.{hdfs_namespace}.svc.cluster.local@${{env.KERBEROS_REALM}}"
))
}