I have a JKS keystore with certicate signed by CA. I need to export it in PEM format in order to use it with nginx. I need to do it in such a way that it includes the whole chain, so that my client can verify the signature.
If I do something like:
keytool -exportcert -keystore mykestore.jks -file mycert.crt -alias myalias
openssl x509 -out mycert.crt.pem -outform pem -in mycert.crt -inform der
It only includes the lowest level certificate. The verification fails:
$ openssl s_client -connect localhost:443
CONNECTED(00000003)
depth=0 /O=*.mydomain.com/OU=Domain Control Validated/CN=*.mydomain.com
verify error:num=20:unable to get local issuer certificate
verify return:1
depth=0 /O=*.mydomain.com/OU=Domain Control Validated/CN=*.mydomain.com
verify error:num=27:certificate not trusted
verify return:1
depth=0 /O=*.mydomain.com/OU=Domain Control Validated/CN=*.mydomain.com
verify error:num=21:unable to verify the first certificate
verify return:1
---
Certificate chain
0 s:/O=*.mydomain.com/OU=Domain Control Validated/CN=*.mydomain.com
i:/C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=123123
... (only one certificate!)
...
SSL-Session:
...
Verify return code: 21 (unable to verify the first certificate)
From Java:
sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
Whereas Jetty with the same JKS keystore prints the following:
$ openssl s_client -connect localhost:8084
CONNECTED(00000003)
depth=2 /C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority
verify error:num=19:self signed certificate in certificate chain
verify return:0
---
Certificate chain
0 s:/O=*.mydomain.com/OU=Domain Control Validated/CN=*.mydomain.com
i:/C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=1234
1 s:/C=US/ST=Arizona/L=Scottsdale/O=GoDaddy.com, Inc./OU=http://certificates.godaddy.com/repository/CN=Go Daddy Secure Certification Authority/serialNumber=1234
i:/C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority
2 s:/C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority
i:/C=US/O=The Go Daddy Group, Inc./OU=Go Daddy Class 2 Certification Authority
...
SSL-Session:
Verify return code: 19 (self signed certificate in certificate chain)
Although openssl returns that 19 error, it no longer is an issue for Java HttpsURLConnection
and that is all I care about.
So, how can I export the whole chain from JKS in a format (e.g. PEM) which works with both nginx server and Java client? What am I missing?
You can easily convert a JKS file into a PKCS12 file:
keytool -importkeystore -srckeystore keystore.jks -srcstoretype JKS -deststoretype PKCS12 -destkeystore keystore.p12
You can then extract the private key and any certs with:
openssl pkcs12 -in keystore.p12