[KAFKA-14237] Kafka TLS Doesn't Present Intermediary Certificates when using PEM - ASF JIRA

Details

Type: Bug
Status: Open
Priority: Blocker
Resolution: Unresolved
Affects Version/s: 3.2.1
Fix Version/s: None
Component/s: security
Labels:
None
Environment:

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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

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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

Description

When using PEM TLS certificates, Kafka does not present the entire certificate chain.

Our /opt/bitnami/kafka/config/server.properties file looks like this:

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 \
WhcNMjUwOTE1MTYwMDAwWjAyMQswCQYDVQQGEwJVUzEWMBQGA1UEChMNTGV0J3Mg \
RW5jcnlwdDELMAkGA1UEAxMCUjMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK \
AoIBAQC7AhUozPaglNMPEuyNVZLD+ILxmaZ6QoinXSaqtSu5xUyxr45r+XXIo9cP \
R5QUVTVXjJ6oojkZ9YI8QqlObvU7wy7bjcCwXPNZOOftz2nwWgsbvsCUJCWH+jdx \
sxPnHKzhm+/b5DtFUkWWqcFTzjTIUu61ru2P3mBw4qVUq7ZtDpelQDRrK9O8Zutm \
NHz6a4uPVymZ+DAXXbpyb/uBxa3Shlg9F8fnCbvxK/eG3MHacV3URuPMrSXBiLxg \
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yJMC6alLbBfODALZvYH7n7do1AZls4I9d1P4jnkDrQoxB3UqQ9hVl3LEKQ73xF1O \
yK5GhDDX8oVfGKF5u+decIsH4YaTw7mP3GFxJSqv3+0lUFJoi5Lc5da149p90Ids \
hCExroL1+7mryIkXPeFM5TgO9r0rvZaBFOvV2z0gp35Z0+L4WPlbuEjN/lxPFin+ \
HlUjr8gRsI3qfJOQFy/9rKIJR0Y/8Omwt/8oTWgy1mdeHmmjk7j1nYsvC9JSQ6Zv \
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-----

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:

openssl s_client -connect myhost.mydomain.com -port 9094

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.

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
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RW5jcnlwdDELMAkGA1UEAxMCUjMwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
AoIBAQC7AhUozPaglNMPEuyNVZLD+ILxmaZ6QoinXSaqtSu5xUyxr45r+XXIo9cP
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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)
---

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:{}

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

{{}}

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.

Kafka TLS Doesn't Present Intermediary Certificates when using PEM

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