SSLCACertificatePath
SSLCACertificatePath directory Server config, virtual host Apache v2 only
This directive sets the directory where you keep the certificates of CAs with whose clients you deal. These are used to verify the client certificate on client authentication.
The files in this directory have to be PEM-encoded and are accessed
through hash filenames. So usually you can’t just
place the Certificate files there: you also have to create symbolic
links named hash-value.N. You should
always make sure this directory contains the appropriate symbolic
links. The utility tools/c_rehash that comes
with OpenSSL does this.