In this post router R-CA will be our CA Server and R-Client will request a certificate from R-CA.
R-CA – Certificate Authority Configuration
crypto key generate rsa label CA modulus 1024
!
crypto pki server CA-Server
database level complete
no database archive
issuer-name CN=r-ca O=lab.local
grant auto
R-Client(config)#crypto pki authenticate R-Client
!!!Session output!!!
R-CA(config)#crypto key generate rsa label CA modulus 1024
The name for the keys will be: CA
% The key modulus size is 1024 bits
% Generating 1024 bit RSA keys, keys will be non-exportable...
[OK] (elapsed time was 0 seconds)
R-CA(config)#
*Jul 15 06:27:12.382: %SSH-5-ENABLED: SSH 1.99 has been enabled
R-CA(config)#ip http server
R-CA(config)#crypto pki ?
server Enable IOS Certificate server
R-CA(config)#crypto pki server CA-Server
R-CA(cs-server)#database level complete
database Certificate Server database config parameters
level Level of data stored in database
complete Each issued certificate is saved to the database
R-CA(cs-server)#issuer-name CN=r-ca O=lab.local
R-CA(cs-server)#grant auto
%PKI-6-CS_GRANT_AUTO: All enrollment requests will be automatically granted.
grant Certificate granting options
auto Automatically grant incoming SCEP enrollment requests
R-CA(cs-server)#no shutdown
%Some server settings cannot be changed after CA certificate generation.
% Please enter a passphrase to protect the private key
% or type Return to exit
Password: Cisco321
Re-enter password: Cisco321
% Generating 1024 bit RSA keys, keys will be non-exportable...
[OK] (elapsed time was 0 seconds)
%PKI-6-CS_ENABLED: Certificate server now enabled.CA Server Verification
R-CA#show crypto pki server
Certificate Server CA-Server:
Status: enabled
State: enabled
Server's configuration is locked (enter "shut" to unlock it)
Issuer name: CN=r-ca O=lab.local
CA cert fingerprint: AFEFAF66 AC1A75AC 03C10C66 EF097925
Granting mode is: auto
Last certificate issued serial number (hex): 1
CA certificate expiration timer: 23:39:26 UTC Jul 13 2022
CRL NextUpdate timer: 05:39:29 UTC Jul 15 2019
Current primary storage dir: nvram:
Database Level: Complete - all issued certs written as <serialnum>.cerR-Client Configuration
R-Client(config)#ip name-server 172.16.10.1
R-Client(config)#ip domain name lab.local
crypto pki trustpoint R-Client
enrollment url http://172.16.10.1:80
ip-address 172.16.20.1
revocation-check none
source interface Loopback1
rsakeypair R-Client
R-Client(config)#crypto pki authenticate R-Client
R-Client(config)#crypto pki enroll R-Client
!!!Session output!!!
crypto key generate rsa label R-Client modulus 1024
R-Client(config)#crypto pki trustpoint R-Client
trustpoint Define a CA trustpoint
R-Client(ca-trustpoint)#enrollment url http://172.16.10.1:80
enrollment Enrollment parameters
url CA server enrollment URL
http: Enroll via http: file system
R-Client(ca-trustpoint)#ip-address 172.16.20.1
ip-address include ip address
R-Client(ca-trustpoint)#revocation-check none
revocation-check Revocation checking options
none Ignore revocation check
R-Client(ca-trustpoint)#source interface loopback 1
source Specify source
R-Client(ca-trustpoint)#rsakeypair R-Client
rsakeypair Specify rsakeypair for this identity
R-Client(config)#crypto pki authenticate R-Client
authenticate Get the CA certificate
Certificate has the following attributes:
Fingerprint MD5: AFEFAF66 AC1A75AC 03C10C66 EF097925
Fingerprint SHA1: 0708F7E8 117142FE F580C327 7EEAB5C3 57BCC690
% Do you accept this certificate? [yes/no]: yes
Trustpoint CA certificate accepted.
R-Client(config)#crypto pki enroll R-Client
enroll Request a certificate from a CA
%
% Start certificate enrollment ..
% Create a challenge password. You will need to verbally provide this
password to the CA Administrator in order to revoke your certificate.
For security reasons your password will not be saved in the configuration.
Please make a note of it.
Password: Cisco321
Re-enter password: Cisco321
% The subject name in the certificate will include: R-Client.lab.local
% Include the router serial number in the subject name? [yes/no]: no
% The IP address in the certificate is 172.16.20.1
Request certificate from CA? [yes/no]: yes
% Certificate request sent to Certificate Authority
% The 'show crypto pki certificate verbose R-Client' commandwill show the fingerprint.
R-Client(config)#
Jul 15 00:02:21.560: CRYPTO_PKI: Certificate Request Fingerprint MD5: A59B6B3F 41D2F1E7 59845816 1E7AEBF1
Jul 15 00:02:21.563: CRYPTO_PKI: Certificate Request Fingerprint SHA1: 439D8A96 16F2CC69 559DDE48 7E800FE3 70F764E9
Jul 15 00:02:24.234: %PKI-6-CERTRET: Certificate received from Certificate Authority
R-Client Verification
R-Client#show crypto pki certificates
Certificate
Status: Available
Certificate Serial Number (hex): 02
Certificate Usage: General Purpose
Issuer:
cn=r-ca O=lab.local
Subject:
Name: R-Client.lab.local
IP Address: 172.16.20.1
ipaddress=172.16.20.1+hostname=R-Client.lab.local
Validity Date:
start date: 00:02:21 UTC Jul 15 2019
end date: 00:02:21 UTC Jul 14 2020
Associated Trustpoints: R-Client
CA Certificate
Status: Available
Certificate Serial Number (hex): 01
Certificate Usage: Signature
Issuer:
cn=r-ca O=lab.local
Subject:
cn=r-ca O=lab.local
Validity Date:
start date: 23:39:26 UTC Jul 14 2019
end date: 23:39:26 UTC Jul 13 2022
Associated Trustpoints: R-Client 