Based on what you state. There is no purpose for the root CA. What do you mean by compromised. If you publish a CA certificate to clients, it does not include the key. (normally) So the only thing a client can do is use it in the session at best. There is NO way a client can use a CA certificate to sign anything without the corresponding key.
I have a chain on my website, and noone (except me, because I can access the server) is able to sign anything. Since the CAs are only used for signing and verifying and not for encrypting, if the CA keys are stored safely, there is no 'compromise' Are you distributing the keys as well? HTH Regards, Serge Fonville On Tue, Sep 1, 2009 at 2:13 PM, Yin, Ben 1. (NSN - CN/Cheng Du)<ben.1....@nsn.com> wrote: > I only want to verfiy the signature (I mean the procedure when sub ca > sign the certiticate). So I guess sub ca and certification should has > enough info to do it because we needn't root ca when we use sub ca to > sign the certificate. Is there a way for this requirement? Thanks. > > > Br > > Ben > > -----Original Message----- > From: owner-openssl-us...@openssl.org > [mailto:owner-openssl-us...@openssl.org] On Behalf Of ext Yin, Ben 1. > (NSN - CN/Cheng Du) > Sent: Tuesday, September 01, 2009 3:06 PM > To: openssl-users@openssl.org > Subject: RE: Verify certificate using subordinate ca > > Hi Serge, > > My intention is to keep my root ca out of compromise. We want to use sub > ca to splite the domain in the our whole network. Then, we can easy to > re-sign a new sub ca and publish it if we find one domain sub ca was > compromised. And if we expose the the root ca to public ,it hard to > maintain if root ca was cracked. > > And as you said, "create a new chain and let sub ca as root", I don't > know how to do it. In my testing, I set verify depth to 1. I guess it > will make chain only include certificate and sub ca. the testing show > that the openssl still try to find the issuer of sub ca, and so the > verification was failed. > > Here is the output: > > -with certificate at depth: 1 > issuer = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Root CA > subject = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Sub1 CA > err 20:unable to get local issuer certificate > -with certificate at depth: 1 > issuer = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Root CA > subject = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Sub1 CA > err 27:certificate not trusted > -with certificate at depth: 0 > issuer = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Sub1 CA > subject = /C=FI/ST=Tampere/L=Tampere/O=NSN/CN=lab. > err 27:certificate not trusted > > And FYI. Here is the complete chain verfication output. > > -with certificate at depth: 2 > issuer = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Root CA > subject = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Root CA > err 0:ok > -with certificate at depth: 1 > issuer = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Root CA > subject = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Sub1 CA > err 0:ok > -with certificate at depth: 0 > issuer = /C=fi/O=WCDMA/CN=NSN Tre WCDMA Sub1 CA > subject = /C=FI/ST=Tampere/L=Tampere/O=NSN/CN=lab. > err 0:ok > > Thanks. > > Br > > Ben > > -----Original Message----- > From: owner-openssl-us...@openssl.org > [mailto:owner-openssl-us...@openssl.org] On Behalf Of ext Serge Fonville > Sent: Tuesday, September 01, 2009 2:14 PM > To: openssl-users@openssl.org > Subject: Re: Verify certificate using subordinate ca > > Hi, > > Hmm... > > I've had the same issue. > Basically it came down to "how do you know if the sub is reliable if > you do not know whether to trust the root?" > If you do not wish to have the root as part of the chain, create a new > chain where the sub is the root > What is the reason you do not want to use the root in the chain check, > but it should be part of the chain? > > HTH > > Regards, > > Serge Fonville > > On Tue, Sep 1, 2009 at 1:04 PM, Yin, Ben 1. (NSN - CN/Cheng > Du)<ben.1....@nsn.com> wrote: >> Hi, >> >> It there a way to verify certificate with out root ca? I have 4 > certificate: >> rootca.pem is the root ca (self signed). subca.pem was signed by > rootca.pem. >> cert1.pem & cert2.pem was signed by subca.pem. I was supposed to > configure >> the client and server using subca.pem as ca, and cert1.pem & cert2.pem > as >> certificate. It seem that openssl still try to find rootca.pem to > verfiy >> subca.pem when handshake. But I don't what root.pem can bo accessed > for >> keeping it safe. So It there a way to verify certificate with out root > ca, >> only using sub ca and certificate signed by sub ca? Thanks. >> >> Br >> >> Ben > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-us...@openssl.org > Automated List Manager majord...@openssl.org > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-us...@openssl.org > Automated List Manager majord...@openssl.org > ______________________________________________________________________ > OpenSSL Project http://www.openssl.org > User Support Mailing List openssl-us...@openssl.org > Automated List Manager majord...@openssl.org > ______________________________________________________________________ OpenSSL Project http://www.openssl.org User Support Mailing List openssl-users@openssl.org Automated List Manager majord...@openssl.org
