Procedimento

Instalando

1) Instalando os Pacotes

yum install -y openssl

Criando uma Autoridade Certificadora

Definindo os valores default para a CA

Edite o arquivo

Linux: /etc/pki/tls/openssl.cnf
Windows: C:\Program Files\Common Files\SSL\openssl.cnf

e altere os dados da CA. Um exemplo de configuração final (apenas o bloco que interessa):

default_md   = sha256

...

default_bits = 2048

...

countryName                     = Country Name (2 letter code)
countryName_default             = BR
...

stateOrProvinceName             = State or Province Name (full name)
stateOrProvinceName_default     = DF

localityName                    = Locality Name (eg, city)
localityName_default            = Brasilia      # Esta linha, normalmente, não existe e você deverá criá-la.

0.organizationName              = Organization Name (eg, company)
0.organizationName_default      = Test Net Ltd

organizationalUnitName          = Organizational Unit Name (eg, section)
organizationalUnitName_default  = Ditec    # Vamos descomentar essa Linha

commonName                      = Common Name (eg, YOUR name)
commonName_max                  = 64
commonName_default              = Autoridade Certificadora da Test Net Ltd

emailAddress                    = Email Address
emailAddress_max                = 64
emailAddress_default            = [email protected]      # Vamos criar essa Linha

Salve e feche o arquivo

Edite o arquivo

Criando a CA

Execute o comando

openssl req -new -x509 -key ca-key.pem -out ca-cert.pem -days 3650 \
-subj "/C=BR/ST=DF/L=/O=Test Net Ltd/CN=Autoridade Certificadora da Test Net Ltd/emailAddress=[email protected]"

Com exceção do Common Name, aceite os valores default, pois já alteramos o openssl.cnf anteriormente.

Informe

CA certificate filename (or enter to create)<ENTER>

Making CA certificate ...
Generating a 2048 bit RSA private key
.........+++
...........................+++
writing new private key to '/etc/pki/CA/private/./cakey.pem'
Enter PEM pass phrase:<INFORME UMA SENHA E ENTER>
Verifying - Enter PEM pass phrase:<INFORME UMA SENHA E ENTER>
-----
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) [BR]:<ENTER>
State or Province Name (full name) [DF]:<ENTER>
Locality Name (eg, city) [Brasilia]:<ENTER>
Organization Name (eg, company) [Test Net Ltd]:<ENTER>
Organizational Unit Name (eg, section) [Ditec]:<ENTER>
Common Name (eg, your name or your server's hostname) [Autoridade Certificadora da Test Net Ltd]:<ENTER>
Email Address [[email protected]]:<ENTER>

Please enter the following 'extra' attributes to be sent with your certificate request
A challenge password []:<ENTER>
An optional company name []:<ENTER>
Using configuration from /etc/pki/tls/openssl.cnf
Enter pass phrase for /etc/pki/CA/private/./cakey.pem:<INFORME A SENHA ANTERIOR E ENTER>
Check that the request matches the signature
Signature ok
Certificate Details:
       Serial Number:
           84:8f:08:9b:5d:d6:df:8f
       Validity
           Not Before: Nov  4 00:28:50 2020 GMT
           Not After : Oct 11 00:28:50 2120 GMT
       Subject:
           countryName               = BR
           stateOrProvinceName       = DF
           organizationName          = Test Net Ltd
           organizationalUnitName    = Ditec
           commonName                = Autoridade Certificadora da Test Net Ltd
           emailAddress              = [email protected]
       X509v3 extensions:
           X509v3 Subject Key Identifier: 
               9B:96:1D:50:C6:E3:69:6B:07:99:17:17:50:91:80:6F:D8:14:4A:C5
           X509v3 Authority Key Identifier: 
               keyid:9B:96:1D:50:C6:E3:69:6B:07:99:17:17:50:91:80:6F:D8:14:4A:C5

           X509v3 Basic Constraints: 
               CA:TRUE
Certificate is to be certified until Oct 11 00:28:50 2120 GMT (36500 days)

Write out database with 1 new entries
Data Base Updated

Disponibilizando a CA

Agora que criamos a CA, vamos disponibilizar ele para importar no Navegador, ou para ser importado na Trust Store.

O certificado raiz é o arquivo

Linux: /etc/pki/CA/cacert.pem
Windows: C:\Program Files\OpenSSL-Win64\bin\demoCA\cacert.pem

Renomeie-o para ca-company.crt e coloque em um site interno para download ou distribua via Police no MS Windows (GPO).

Criando um par de Chaves

Execute o comando no Windows

perl CA.pl -newreq

ou no Linux

./CA -newreq

Informe

Country Name (2 letter code) [BR]: <ENTER>
State or Province Name (full name) [DF]:<ENTER>
Locality Name (eg, city) [Brasilia]:<ENTER>
Organization Name (eg, company) [Test Net Ltd]: <ENTER>
Organizational Unit Name (eg, section) [Ditec]:<ENTER>
Common Name (eg, YOUR name) []:www.test.net
Email Address [[email protected]]:<ENTER>

Será criado 2 arquivos:

newreq.pem: Arquivo de requisição (CSR)
newkey.pem: Chave privada assinada

Assine a chave criada OpenSSL: Assinando um CSR com a nossa CA

Ver também