Environment variables

Once Apache SSL is installed, a number of new environment variables will appear and can be used in CGI scripts (see Chapter 13). They are shown in Table 11-1.

Table 11-1. Apache v1.3 environment variables

Variable	Value type	Description
HTTPS	flag	HTTPS being used
HTTPS_CIPHER	string	SSL/TLS cipherspec
SSL_CIPHER	string	The same as HTTPS_CIPHER
SSL_PROTOCOL_VERSION	string	Self explanatory
SSL_SSLEAY_VERSION	string	Self explanatory
HTTPS_KEYSIZE	number	Number of bits in the session key
HTTPS_SECRETKEYSIZE	number	Number of bits in the secret key
SSL_CLIENT_DN	string	DN in client’s certificate
SSL_CLIENT_ x509	string	Component of client’s DN, where x509 is a component of an X509 DN
SSL_CLIENT_I_DN	string	DN of issuer of client’s certificate
SSL_CLIENT_I_ x509	string	Component of client’s issuer’s DN, where x509 is a component of an X509 DN
SSL_SERVER_DN	string	DN in server’s certificate
SSL_SERVER_ x509	string	Component of server’s DN, where x509 is a component of an X509 DN
SSL_SERVER_I_DN	string	DN of issuer of server’s certificate
SSL_SERVER_I_ x509	string	Component of server’s issuer’s DN, where x509 is a component of an X509 DN
SSL_CLIENT_CERT	string	Base64 encoding of client cert
SSL_CLIENT_CERT_CHAIN_ n	string	Base64 encoding of client cert chain