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Help with a bash script for openvpn

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Old 10-17-2007
Help with a bash script for openvpn
I've got a openvpn server and I'm searching a way to permit that a certain certificate is operative only if the connection comes from from a certain ip. Others certificates must have not this limitation because they are for road warriors and we don't know where they can come from.

So the idea is to have an array in a script (we can state some up and down script) or an external file where we have this data:

nameofcertificate:ip or network or range

example

jsmith:1.2.3.4
jsmith:1.2.3.5
jsmith:192.168.1.[10-20]

so Mr Smitch can connect only from these locations.

I state that at the beginning of the connection I've got both the variables, one derived from the common_name and the other from the env and is trusted_ip.

Now I've got to compare the array (or external file) with this variables and if there is a corrispondence permit the connection else not. If a valid certificate is not in the list there is no check on ip.

I am not very skilled for this kind of work, someone can help me? Thanks.
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LEARN ABOUT PHP

openssl_x509_checkpurpose

OPENSSL_X509_CHECKPURPOSE(3)						 1					      OPENSSL_X509_CHECKPURPOSE(3)

openssl_x509_checkpurpose - Verifies if a certificate can be used for a particular purpose

SYNOPSIS

       int openssl_x509_checkpurpose (mixed  $x509cert, int  $purpose, [array  $cainfo = array()], [string  $untrustedfile])

DESCRIPTION

       openssl_x509_checkpurpose(3) examines a certificate to see if it can be used for the specified $purpose.

PARAMETERS

	      o $x509cert
		- The examined certificate.

	      o $purpose
		-

	      openssl_x509_checkpurpose(3) purposes

	      +---------------------------+---------------------------------------------------+
	      | 	Constant	  |						      |
	      | 			  |						      |
	      | 			  |		       Description		      |
	      | 			  |						      |
	      +---------------------------+---------------------------------------------------+
	      | X509_PURPOSE_SSL_CLIENT   |						      |
	      | 			  |						      |
	      | 			  | Can  the  certificate be used for the client side |
	      | 			  | of an SSL connection?			      |
	      | 			  |						      |
	      | X509_PURPOSE_SSL_SERVER   |						      |
	      | 			  |						      |
	      | 			  | Can the certificate be used for the  server  side |
	      | 			  | of an SSL connection?			      |
	      | 			  |						      |
	      |X509_PURPOSE_NS_SSL_SERVER |						      |
	      | 			  |						      |
	      | 			  |   Can the cert be used for Netscape SSL server?   |
	      | 			  |						      |
	      | X509_PURPOSE_SMIME_SIGN   |						      |
	      | 			  |						      |
	      | 			  |    Can the cert be used to sign S/MIME email?     |
	      | 			  |						      |
	      |X509_PURPOSE_SMIME_ENCRYPT |						      |
	      | 			  |						      |
	      | 			  |   Can the cert be used to encrypt S/MIME email?   |
	      | 			  |						      |
	      |  X509_PURPOSE_CRL_SIGN	  |						      |
	      | 			  |						      |
	      | 			  | Can  the cert be used to sign a certificate revo- |
	      | 			  | cation list (CRL)?				      |
	      | 			  |						      |
	      |     X509_PURPOSE_ANY	  |						      |
	      | 			  |						      |
	      | 			  |    Can the cert be used for Any/All purposes?     |
	      | 			  |						      |
	      +---------------------------+---------------------------------------------------+
	       These options are not bitfields - you may specify one only!

	      o $cainfo
		-$cainfo should be an array of trusted CA files/dirs as described in Certificate Verification.

	      o $untrustedfile
		- If specified, this should be the name of a PEM encoded file holding certificates that can be used to help  verify  the  certifi-
		cate, although no trust is placed in the certificates that come from that file.

RETURN VALUES

	Returns TRUE if the certificate can be used for the intended purpose, FALSE if it cannot, or -1 on error.

PHP Documentation Group 											      OPENSSL_X509_CHECKPURPOSE(3)