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Generating the machine certificate
==================================
In this step, we generate certificates for each of the machines. Please
note that both clients and servers need certificates. The certificate
identifies each machine to the remote peer. The DNSName specified inside
the certificate can
be specified inside the $<object>PermittedPeer config statements.
For now, we assume that a single person (or group) is responsible for
the whole rsyslog system and thus it is OK if that single person is in
possession of all machine's private keys. This simplification permits us
to use a somewhat less complicated way of generating the machine
certificates. So, we generate both the private and public key on the CA
(which is NOT a server!) and then copy them over to the respective
machines.
If the roles of machine and CA administrators are split, the private key
must be generated by the machine administrator. This is done via a
certificate request. This request is then sent to the CA admin, which in
turn generates the certificate (containing the public key). The CA admin
then sends back the certificate to the machine admin, who installs it.
That way, the CA admin never gets hold of the machine's private key.
Instructions for this mode will be given in a later revision of this
document.
**In any case, it is vital that the machine's private key is protected.
Anybody able to obtain that private key can impersonate as the machine
to which it belongs, thus breaching your security.**
Sample Screen Session
~~~~~~~~~~~~~~~~~~~~~
Text in red is user input. Please note that for some questions, there is
no user input given. This means the default was accepted by simply
pressing the enter key.
**Please note:** you need to substitute the names specified below with
values that match your environment. Most importantly,
machine.example.net must be replaced by the actual name of the machine
that will be using this certificate. For example, if you generate a
certificate for a machine named "server.example.com", you need to use
that name. If you generate a certificate for "client.example.com", you
need to use this name. Make sure that each machine certificate has a
unique name. If not, you can not apply proper access control.
::
[root@rgf9dev sample]# certtool --generate-privkey --outfile key.pem --bits 2048
Generating a 2048 bit RSA private key...
[root@rgf9dev sample]# certtool --generate-request --load-privkey key.pem --outfile request.pem
Generating a PKCS #10 certificate request...
Country name (2 chars): US
Organization name: SomeOrg
Organizational unit name: SomeOU
Locality name: Somewhere
State or province name: CA
Common name: machine.example.net
UID:
Enter a dnsName of the subject of the certificate:
Enter the IP address of the subject of the certificate:
Enter the e-mail of the subject of the certificate:
Enter a challenge password:
Does the certificate belong to an authority? (y/N): n
Will the certificate be used for signing (DHE and RSA-EXPORT ciphersuites)? (y/N):
Will the certificate be used for encryption (RSA ciphersuites)? (y/N):
Is this a TLS web client certificate? (y/N): y
Is this also a TLS web server certificate? (y/N): y
[root@rgf9dev sample]# certtool --generate-certificate --load-request request.pem --outfile cert.pem --load-ca-certificate ca.pem --load-ca-privkey ca-key.pem
Generating a signed certificate...
Enter the certificate's serial number (decimal):
Activation/Expiration time.
The certificate will expire in (days): 1000
Extensions.
Do you want to honour the extensions from the request? (y/N):
Does the certificate belong to an authority? (Y/N): n
Will the certificate be used for IPsec IKE operations? (y/N):
Is this a TLS web client certificate? (Y/N): y
Is this also a TLS web server certificate? (Y/N): y
Enter the dnsName of the subject of the certificate: machine.example.net {This is the name of the machine that will use the certificate}
Enter the IP address of the subject of certificate:
Will the certificate be used for signing (DHE and RSA-EXPORT ciphersuites)? (Y/N):
Will the certificate be used for encryption (RSA ciphersuites)? (Y/N):
X.509 Certificate Information:
Version: 3
Serial Number (hex): 485a3819
Validity:
Not Before: Thu Jun 19 10:42:54 UTC 2008
Not After: Wed Mar 16 10:42:57 UTC 2011
Subject: C=US,O=SomeOrg,OU=SomeOU,L=Somewhere,ST=CA,CN=machine.example.net
Subject Public Key Algorithm: RSA
Modulus (bits 2048):
b2:4e:5b:a9:48:1e:ff:2e:73:a1:33:ee:d8:a2:af:ae
2f:23:76:91:b8:39:94:00:23:f2:6f:25:ad:c9:6a:ab
2d:e6:f3:62:d8:3e:6e:8a:d6:1e:3f:72:e5:d8:b9:e0
d0:79:c2:94:21:65:0b:10:53:66:b0:36:a6:a7:cd:46
1e:2c:6a:9b:79:c6:ee:c6:e2:ed:b0:a9:59:e2:49:da
c7:e3:f0:1c:e0:53:98:87:0d:d5:28:db:a4:82:36:ed
3a:1e:d1:5c:07:13:95:5d:b3:28:05:17:2a:2b:b6:8e
8e:78:d2:cf:ac:87:13:15:fc:17:43:6b:15:c3:7d:b9
Exponent:
01:00:01
Extensions:
Basic Constraints (critical):
Certificate Authority (CA): FALSE
Key Purpose (not critical):
TLS WWW Client.
TLS WWW Server.
Subject Alternative Name (not critical):
DNSname: machine.example.net
Subject Key Identifier (not critical):
0ce1c3dbd19d31fa035b07afe2e0ef22d90b28ac
Authority Key Identifier (not critical):
fbfe968d10a73ae5b70d7b434886c8f872997b89
Other Information:
Public Key Id:
0ce1c3dbd19d31fa035b07afe2e0ef22d90b28ac
Is the above information ok? (Y/N): y
Signing certificate...
[root@rgf9dev sample]# rm -f request.pem
[root@rgf9dev sample]# ls -l
total 16
-r-------- 1 root root 887 2008-06-19 12:33 ca-key.pem
-rw-r--r-- 1 root root 1029 2008-06-19 12:36 ca.pem
-rw-r--r-- 1 root root 1074 2008-06-19 12:43 cert.pem
-rw-r--r-- 1 root root 887 2008-06-19 12:40 key.pem
[root@rgf9dev sample]# # it may be a good idea to rename the files to indicate where they belong to
[root@rgf9dev sample]# mv cert.pem machine-cert.pem
[root@rgf9dev sample]# mv key.pem machine-key.pem
[root@rgf9dev sample]#
Distributing Files
~~~~~~~~~~~~~~~~~~
Provide the machine with:
- a copy of ca.pem
- cert.pem
- key.pem
This is how the relevant part of rsyslog.conf looks on the target
machine:
````
::
global(
DefaultNetstreamDriver="gtls"
DefaultNetstreamDriverCAFile="/path/to/contrib/gnutls/ca.pem"
DefaultNetstreamDriverCertFile="/path/to/contrib/gnutls/cert.pem"
DefaultNetstreamDriverKeyFile="/path/to/contrib/gnutls/key.pem"
)
**Never provide anyone with ca-key.pem!** Also, make sure nobody but the
machine in question gets hold of key.pem.
|
