On Mon, Jan 28, 2008 at 05:02:05PM +0100, Guy Deleeuw wrote:
> Hello all,
>
> I'm new on the list.
> I create a CA in 2003 and she have expired yesterday.
>
> It is possible to renew the CA without re create all clients certificates ?
>
With great care, yes. You must use the same private key, the same DN, serial
number and the same key-id if applicable. For example in the cert:
Certificate:
Data:
Version: 3 (0x2)
Serial Number:
e7:ed:11:3a:5f:51:0d:4d
Signature Algorithm: ecdsa-with-SHA1
Issuer: C=US, ST=New York, L=New York, O=Example Corp, CN=Insecure
CA/[EMAIL PROTECTED]
Validity
Not Before: Jan 11 05:17:59 2008 GMT
Not After : Jan 11 05:17:59 2018 GMT
Subject: C=US, ST=New York, L=New York, O=Example Corp, CN=Insecure
CA/[EMAIL PROTECTED]
Subject Public Key Info:
Public Key Algorithm: id-ecPublicKey
Public-Key: (256 bit)
pub:
04:e6:0e:ec:fe:04:df:13:5d:78:f7:c4:52:a1:94:
ee:19:09:13:b4:59:7d:d0:a2:73:38:ef:42:b8:40:
a1:d5:03:5b:18:e2:2b:6c:05:87:22:bb:5a:af:6a:
82:b5:d5:03:0e:07:8c:40:cc:43:b8:1c:2d:09:cc:
97:a0:eb:e5:06
ASN1 OID: prime256v1
X509v3 extensions:
X509v3 Basic Constraints: critical
CA:TRUE
X509v3 Subject Key Identifier:
0E:D4:AA:B1:09:91:7C:36:60:EA:56:4E:9C:57:00:AF:9C:4D:02:00
X509v3 Authority Key Identifier:
keyid:0E:D4:AA:B1:09:91:7C:36:60:EA:56:4E:9C:57:00:AF:9C:4D:02:00
DirName:/C=US/ST=New York/L=New York/O=Example Corp/CN=Insecure
CA/[EMAIL PROTECTED]
serial:E7:ED:11:3A:5F:51:0D:4D
Signature Algorithm: ecdsa-with-SHA1
30:43:02:1f:7e:e3:7c:d8:de:56:fb:f1:dd:e2:1a:5a:fb:45:
24:f4:18:24:8a:a0:fa:fc:f5:6e:88:ce:25:20:89:4d:9d:02:
20:71:86:6c:eb:a7:58:00:b1:b7:d4:e6:0c:03:d2:27:73:cd:
e9:30:91:f7:7a:dc:9d:fd:a4:91:0c:91:05:a8:27
The "Authority Key Identifier" extension must not change when the self-signed
certificate is re-issued.
To re-sign the CA cert, set the "serial" option to a file with the serial
number of the old CA, adjust other ".cnf" file options as necessary and
generate the new CA cert.
openssl ca -batch \
-md sha1 \
-config ca.cnf \
-keyfile oldkey.pem \
-cert oldcert.pem \
-ss_cert oldcert.pem \
-extensions ca_cert \
-days $days \
-out newcert.pem
With appropriate setings in ca.cnf and the "ca_cert" section there-in. You
may want some of the following:
[ ca_cert ]
basicConstraints = critical,CA:true
subjectKeyIdentifier = hash # this first
authorityKeyIdentifier = keyid:always, issuer:always # and now this
--
Viktor.
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