How to add subject alernative name to ssl certs

Question

I m using openssl to create self-signed certs  I m getting this error with the certs I generated      javax net ssl SSLHandshakeException    java security cert CertificateException  No subject alternative names   present    Does anyone know how to specify  Subject alternative name  while creating a cert  This is how I m generating a keystore   sudo  JAVA HOME bin keytool -genkey -dname  CN 192 168 x xxx  OU I  O I  L T  ST On  C CA  -alias tomcat -validity 3650 -keyalg RSA -keystore  root  keystore -keypass abcd -storepass abcd   To generate a key    openssl s client -connect 192 168 x xxx 8443 2 gt  dev null   Please help  Thanks

User · Answer

When generating CSR is possible to specify -ext attribute again to have it inserted in the CSR

keytool -certreq -file test.csr -keystore test.jks -alias testAlias -ext SAN=dns:test.example.com

complete example here: How to create CSR with SANs using keytool

User · Answer

Both IP and DNS can be specified with the keytool additional argument -ext SAN dns abc com ip 1 1 1 1  Example   keytool -genkeypair -keystore  lt keystore gt  -dname  CN test  OU Unknown  O Unknown  L Unknown  ST Unknown  C Unknown  -keypass  lt keypwd gt  -storepass  lt storepass gt  -keyalg RSA -alias unknown -ext SAN dns test abc com ip 1 1 1 1

User · Answer

Although this question was more specifically about IP addresses in Subject Alt  Names  the commands are similar  using DNS entries for a host name and IP entries for IP addresses    To quote myself      If you re using keytool  as of Java 7  keytool has an option to   include a Subject Alternative Name  see the table in the documentation   for -ext   you could use -ext san dns www example com or -ext   san ip 10 0 0 1   Note that you only need Java 7 s keytool to use this command  Once you ve prepared your keystore  it should work with previous versions of Java    The rest of this answer also mentions how to do this with OpenSSL  but it doesn t seem to be what you re using

[ssl] How to add subject alernative name to ssl certs?

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