Computing/SSL

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Current revision (15:50, 10 August 2007) (view source)
 
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[http://goc.eu-eela.org/operations/certification-authority-and-virtual-organisation-operations/certificate-manipulation/ Certificate manipulation]
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Using wget to download files from certificate-protected sites at MIT:
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Converting a certificate from pkcs12 to pem (first step extracts the private key and the second one extracts the public key):
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*Download [http://ca.mit.edu/mitca.crt MIT CA]
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  openssl pkcs12 -nocerts -in usercert.p12 -out ~user/.globus/userkey.pem
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*Convert the extracted MIT CA from DER to PEM format:
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  chmod 400 ~user/.globus/userkey.pem
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openssl x509 -out mitca.pem -outform pem -in mitca.crt -inform der
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  openssl pkcs12 -clcerts -nokeys -in usercert.p12 -out ~user/.globus/usercert.pem
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*Install [http://ca.mit.edu/ personal MIT certificate] into web browser
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*Extract private and public keys from the .p12 certificate (converting from pkcs12 to PEM).  The first step extracts the private key and the second one extracts the public key:
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  openssl pkcs12 -nocerts -in usercert.p12 -out ~user/userkey.pem
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  chmod 400 ~user/userkey.pem
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  openssl pkcs12 -clcerts -nokeys -in usercert.p12 -out ~user/usercert.pem
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*Use the certificates to download files:
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wget --private-key=/home/user/mitkey.pem \
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--certificate=/home/user/mitcert.pem \
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--ca-certificate=/home/user/mitca.pem \
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https://web.mit.edu/rhlinux/rhel-5.0/5.0-client-i386/rhel-5-client-i386-disc4.iso
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==Notes==
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You won't need the --ca-certificate flag if the server SSL cert is signed up a CA recognized in the wget default CA bundle. Now, more importantly, if you remove the --certificate and --private-key parts, that wget should FAIL, giving you an error something like this:
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OpenSSL: error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert
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==References==
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*[http://goc.eu-eela.org/operations/certification-authority-and-virtual-organisation-operations/certificate-manipulation/ Certificate manipulation]
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*https://biowiki.mit.edu/wiki/index.php/Setting_Up_SSL_on_Web_Servers
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*http://web.mit.edu/apache-ssl/
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*http://mark.foster.cc/kb/openssl-keytool.html
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*http://mark.foster.cc/kb/cacert-keystore-extraction.html
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*http://www.ender.com/2005/11/installing_your_own_ca_authori.html
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*From the openssl man page:
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      --certificate=file
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          Use the client certificate stored in file.  This is needed for
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          servers that are configured to require certificates from the
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          clients that connect to them.  Normally a certificate is not
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          required and this switch is optional.
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      --private-key=file
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          Read the private key from file.  This allows you to provide the
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          private key in a file separate from the certificate.
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      --ca-certificate=file
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          Use file as the file with the bundle of certificate authorities
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          (‘‘CA’’) to verify the peers.  The certificates must be in PEM format.
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      --no-check-certificate
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          Don’t check the server certificate against the available certificate authorities.

Current revision

Using wget to download files from certificate-protected sites at MIT:

  • Download MIT CA
  • Convert the extracted MIT CA from DER to PEM format:
openssl x509 -out mitca.pem -outform pem -in mitca.crt -inform der 
  • Install personal MIT certificate into web browser
  • Extract private and public keys from the .p12 certificate (converting from pkcs12 to PEM). The first step extracts the private key and the second one extracts the public key:
openssl pkcs12 -nocerts -in usercert.p12 -out ~user/userkey.pem
chmod 400 ~user/userkey.pem
openssl pkcs12 -clcerts -nokeys -in usercert.p12 -out ~user/usercert.pem
  • Use the certificates to download files:
wget --private-key=/home/user/mitkey.pem \
--certificate=/home/user/mitcert.pem \
--ca-certificate=/home/user/mitca.pem \
https://web.mit.edu/rhlinux/rhel-5.0/5.0-client-i386/rhel-5-client-i386-disc4.iso

Notes

You won't need the --ca-certificate flag if the server SSL cert is signed up a CA recognized in the wget default CA bundle. Now, more importantly, if you remove the --certificate and --private-key parts, that wget should FAIL, giving you an error something like this: OpenSSL: error:14094410:SSL routines:SSL3_READ_BYTES:sslv3 alert

References

      --certificate=file
          Use the client certificate stored in file.  This is needed for
          servers that are configured to require certificates from the
          clients that connect to them.  Normally a certificate is not
          required and this switch is optional.
      --private-key=file
          Read the private key from file.  This allows you to provide the
          private key in a file separate from the certificate.
      --ca-certificate=file
          Use file as the file with the bundle of certificate authorities
          (‘‘CA’’) to verify the peers.  The certificates must be in PEM format.
      --no-check-certificate
          Don’t check the server certificate against the available certificate authorities.
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