>From: owner-openssl-us...@openssl.org On Behalf Of Mithun Kumar
>Sent: Thursday, 04 October, 2012 14:31
>I have a self signed certificate created and i have loaded that
>into a trust store of the client. I have also configured the Server
>with that self signed certificate. So when i try to establish
>connection i get the exception in following code
>v3_purp.c
<snip>
> else if(ku_reject(issuer, KU_KEY_CERT_SIGN))
> return X509_V_ERR_KEYUSAGE_NO_CERTSIGN; //Exception thrown here
Aside: C doesn't "throw" exceptions as some other languages do
(including C++). This is really "returned", or at most "raised".
But that doesn't affect your point.
>Any inputs why client is throwing X509_V_ERR_KEYUSAGE_NO_CERTSIGN
exception?
Because the cert has a KeyUsage extension that excludes certSign.
OpenSSL requires issuer certs to have certSign -- and treats a
selfsigned cert as issuing itself, which is somewhat debatable.
>Here my server is Microsoft SQL Server , Client uses openssl. Also this
>issue occurs only when i create a self signed certificate using IIS
server!!!
You create with IIS but use in SQLserver? On the (one) IIS-manager
I have access to (but don't normally use) "create self-signed cert..."
creates KU keyEncrypt,dataEncrypt and EKU serverAuth -- which
violates RFC 5280 as I read it but hey that's Microsoft for you.
(And per RFC 5246 it allows only plain RSA not DHE-RSA or ECDHE-RSA,
but plain RSA is widely supported, probably widest.)
Options:
- create (or get created) a key + selfsigned cert with KU having
certSign in addition to keyEncrypt (and preferably digSign),
or KU omitted (then relier must default to allow-all-usage).
This is easy to do with openssl 'req -new -x509'.
- use a CA-issued cert, where the CA's root and issued certs have
desired or omitted KU. A real CA already does this, and one you
create with openssl ('ca' or just 'x509 -req') easily can.
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