[1] Create certifcate first. Click here
[2] Configure Postfix and Dovecot for SSL
[root@www certs]# make server.key
umask 77 ; \
/usr/bin/openssl genrsa -aes128 2048 > server.key
Generating RSA private key, 2048 bit long modulus
..+++
...+++
e is 65537 (0x10001)
Enter pass phrase: # set passphrase
Verifying - Enter pass phrase: # confirm
# remove passphrase from private key
[root@www certs]# openssl rsa -in server.key -out server.key
Enter pass phrase for server.key: # input passphrase
writing RSA key
umask 77 ; \
/usr/bin/openssl req -utf8 -new -key server.key -out server.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:
State or Province Name (full name) []:
Organization Name (eg, company) [Default Company Ltd]:
Common Name (eg, your name or your server's hostname) []: www.server.world
Email Address []: [email protected] # email address
/usr/bin/openssl req -utf8 -new -key server.key -out server.csr
You are about to be asked to enter information that will be incorporated
into your certificate request.
What you are about to enter is what is called a Distinguished Name or a DN.
There are quite a few fields but you can leave some blank
For some fields there will be a default value,
If you enter '.', the field will be left blank.
-----
Country Name (2 letter code) [XX]:
JP # country
State or Province Name (full name) []:
Hiroshima # state
Locality Name (eg, city) [Default City]:Hiroshima # city
Organization Name (eg, company) [Default Company Ltd]:
GTS # company
Organizational Unit Name (eg, section) []: UnixC Hosting Support # departmentCommon Name (eg, your name or your server's hostname) []: www.server.world
# server's FQDN
Email Address []: [email protected] # email address
Please enter the following 'extra' attributes
to be sent with your certificate request
A challenge password []: # Enter
An optional company name []: # Enter
to be sent with your certificate request
A challenge password []: # Enter
An optional company name []: # Enter
[root@www certs]# openssl x509 -in server.csr -out server.crt -req -signkey server.key -days 3650
Signature ok
subject=/C=JP/ST=Hiroshima/L=Hiroshima/O=GTS/OU=UnixC Hosting/CN=www.yourdomain.com/[email protected]
Getting Private key
[root@www certs]# chmod 400 server.*
