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1,254 bytes removed ,  20:02, 11 February 2018
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  keyUsage = digitalSignature, keyEncipherment
 
  keyUsage = digitalSignature, keyEncipherment
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    Can someone help me with the exact syntax?
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Its a three step process, and it involves modifying openssl.cnf file. You might be able to do it with only command line options, but I don't do it that way.
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Find your openssl.cnf file. It is likely located in /usr/lib/ssl/openssl.cnf:
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$ find /usr/lib -name openssl.cnf
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/usr/lib/openssl.cnf
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/usr/lib/openssh/openssl.cnf
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/usr/lib/ssl/openssl.cnf
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On my Debian system, /usr/lib/ssl/openssl.cnf is used by the built-in openssl program. On recent Debian systems it is located at /etc/ssl/openssl.cnf
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You can determine which openssl.cnf is being used by adding a spurious XXX to the file and see if openssl chokes.
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First, modify the req parameters. Add an alternate_names section to openssl.cnf with the names you want to use. There are no existing alternate_names sections, so it does not matter where you add it.
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[ alternate_names ]
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DNS.1        = example.com
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DNS.2        = www.example.com
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DNS.3        = mail.example.com
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DNS.4        = ftp.example.com
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Next, add the following to the existing [ v3_ca ] section. Search for the exact string [ v3_ca ]:
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subjectAltName      = @alternate_names
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You might change keyUsage to the following under [ v3_ca ]:
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keyUsage = digitalSignature, keyEncipherment
      
digitalSignature and keyEncipherment are standard faire for a server certificate. Don't worry about nonRepudiation. Its a useless bit thought up by comp sci guys who wanted to be lawyers. It means nothing in the legal world.
 
digitalSignature and keyEncipherment are standard faire for a server certificate. Don't worry about nonRepudiation. Its a useless bit thought up by comp sci guys who wanted to be lawyers. It means nothing in the legal world.

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