Ryan R created KAFKA-14237:
------------------------------
Summary: Kafka TLS Doesn't Present Intermediary Certificates when
using PEM
Key: KAFKA-14237
URL: https://issues.apache.org/jira/browse/KAFKA-14237
Project: Kafka
Issue Type: Bug
Components: security
Affects Versions: 3.2.1
Environment: Deployed using the Bitnami Helm
Chart(https://github.com/bitnami/charts/tree/master/bitnami/kafka)
The Bitnami Helm Chart uses Docker Image:
https://github.com/bitnami/containers/tree/main/bitnami/kafka
An issue was already opened with Bitnami and they told us to send this
upstream: https://github.com/bitnami/containers/issues/6654
Reporter: Ryan R
When using PEM TLS certificates, Kafka does not present the entire certificate
chain.
Our {{/opt/bitnami/kafka/config/server.properties}} file looks like this:
{code:java}
ssl.keystore.type=PEM
ssl.truststore.type=PEM
ssl.keystore.key=-----BEGIN PRIVATE KEY----- \
<redacted>
-----END PRIVATE KEY-----
ssl.keystore.certificate.chain=-----BEGIN CERTIFICATE----- \
<redacted>
-----END CERTIFICATE----- \
-----BEGIN CERTIFICATE----- \
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw \
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh \
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMjAwOTA0MDAwMDAw \
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MldlTTKB3zhThV1+XWYp6rjd5JW1zbVWEkLNxE7GJThEUG3szgBVGP7pSWTUTsqX \
nLRbwHOoq7hHwg== \
-----END CERTIFICATE----- \
ssl.truststore.certificates=-----BEGIN CERTIFICATE----- \
MIIFazCCA1OgAwIBAgIRAIIQz7DSQONZRGPgu2OCiwAwDQYJKoZIhvcNAQELBQAw \
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh \
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMTUwNjA0MTEwNDM4 \
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emyPxgcYxn/eR44/KJ4EBs+lVDR3veyJm+kXQ99b21/+jh5Xos1AnX5iItreGCc= \
-----END CERTIFICATE-----{code}
The {{ssl.keystore.certificate.chain}} has (in order) our endpoint certificate
followed by the Let's Encrypt R3 Intermediate certificate underneath it. The
{{ssl.truststore.certificates}} entry is the Let's Encrypt ISRG Root X1 CA
certificate.
We can test the configuration with:
{code:java}
openssl s_client -connect myhost.mydomain.com -port 9094{code}
Which returns the below output. The output says that only one certificate is
being presented, and it is the Intermediate certificate and not the
endpoint/leaf certificate, which is why the signature is failing.
{code:java}
CONNECTED(00000003)
depth=1 C = US, O = Internet Security Research Group, CN = ISRG Root X1
verify return:1
depth=0 C = US, O = Let's Encrypt, CN = R3
verify return:1
140176629757248:error:0407E086:rsa routines:RSA_verify_PKCS1_PSS_mgf1:last
octet invalid:../crypto/rsa/rsa_pss.c:88:
140176629757248:error:1417B07B:SSL routines:tls_process_cert_verify:bad
signature:../ssl/statem/statem_lib.c:504:
---
Certificate chain
0 s:C = US, O = Let's Encrypt, CN = R3
i:C = US, O = Internet Security Research Group, CN = ISRG Root X1
---
Server certificate
-----BEGIN CERTIFICATE-----
MIIFFjCCAv6gAwIBAgIRAJErCErPDBinU/bWLiWnX1owDQYJKoZIhvcNAQELBQAw
TzELMAkGA1UEBhMCVVMxKTAnBgNVBAoTIEludGVybmV0IFNlY3VyaXR5IFJlc2Vh
cmNoIEdyb3VwMRUwEwYDVQQDEwxJU1JHIFJvb3QgWDEwHhcNMjAwOTA0MDAwMDAw
WhcNMjUwOTE1MTYwMDAwWjAyMQswCQYDVQQGEwJVUzEWMBQGA1UEChMNTGV0J3Mg
RW5jcnlwdDELMAkGA1UEAxMCUjMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
AoIBAQC7AhUozPaglNMPEuyNVZLD+ILxmaZ6QoinXSaqtSu5xUyxr45r+XXIo9cP
R5QUVTVXjJ6oojkZ9YI8QqlObvU7wy7bjcCwXPNZOOftz2nwWgsbvsCUJCWH+jdx
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Z3Vms/EY96Jc5lP/Ooi2R6X/ExjqmAl3P51T+c8B5fWmcBcUr2Ok/5mzk53cU6cG
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nLRbwHOoq7hHwg==
-----END CERTIFICATE-----
subject=C = US, O = Let's Encrypt, CN = R3issuer=C = US, O = Internet Security
Research Group, CN = ISRG Root X1---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 1838 bytes and written 329 bytes
Verification: OK
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 2048 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
---{code}
If I remove the Intermediary certificate from the
{{ssl.keystore.certificate.chain}} entry, Kafka now sends me the endpoint
certificate but without the Intermediary certificate. This means the
certificate will not be trusted unless the intermediary certificate is manually
trusted. The output of {{openssl s_client -connect myhost.mydomain.com -port
9094}} is now:{{{}{}}}
{code:java}
CONNECTED(00000003)
depth=0 CN = myhost.mydomain.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 CN = myhost.mydomain.com
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
0 s:CN = myhost.mydomain.com
i:C = US, O = Let's Encrypt, CN = R3
---
Server certificate
-----BEGIN CERTIFICATE-----
<redacted>
-----END CERTIFICATE-----
subject=CN = myhost.mydomain.comissuer=C = US, O = Let's Encrypt, CN = R3---
No client certificate CA names sent
Peer signing digest: SHA256
Peer signature type: RSA-PSS
Server Temp Key: X25519, 253 bits
---
SSL handshake has read 2011 bytes and written 402 bytes
Verification error: unable to verify the first certificate
---
New, TLSv1.3, Cipher is TLS_AES_256_GCM_SHA384
Server public key is 2048 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 21 (unable to verify the first certificate)
---
---
Post-Handshake New Session Ticket arrived:
SSL-Session:
Protocol : TLSv1.3
Cipher : TLS_AES_256_GCM_SHA384
Session-ID: <redacted>
Session-ID-ctx:
Resumption PSK: <redacted>
PSK identity: None
PSK identity hint: None
SRP username: None
TLS session ticket lifetime hint: 86400 (seconds)
TLS session ticket:
<redacted> Start Time: 1663274615
Timeout : 7200 (sec)
Verify return code: 21 (unable to verify the first certificate)
Extended master secret: no
Max Early Data: 0 {code}
{{}}
The current workaround is to install the Intermediary certificate in the root
of trust.
I have tried reversing the order of the certificates in the
{{ssl.keystore.certificate.chain}} entry, which makes Kafka throw errors (as
expected).
I have also tried adding the Root certificate to the
{{ssl.keystore.certificate.chain}} (a total of 3 certificates), and this
results in the Root CA certificate alone being sent in the TLS handshake. It
seems that Kafka always sends a single certificate, and it is always the last
one in the {{ssl.keystore.certificate.chain}} chain.
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