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SSL/TLS: Parse CertificateRequest message

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This commit introduces parsing of the CertificateRequest message in the
TLS handshake. It introduces a new event ssl_certificate_request, as
well as a new function parse_distinguished_name, which can be used to
parse part of the ssl_certificate_request event parameters.

This commit also introduces a new policy script, which appends
information about the CAs a TLS server requests in the
CertificateRequest message, if it sends it.
This commit is contained in:
Johanna Amann 2023-03-09 08:20:50 +01:00
parent b73dda5cff
commit b56b856da9
17 changed files with 221 additions and 4 deletions
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23
scripts/policy/protocols/ssl/certificate-request-info.zeek Normal file
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##! When the server requests a client certificate, it optionally may specify a list of CAs that
##! it accepts. If the server does this, this script adds this list to ssl.log.
@load base/protocols/ssl
module SSL;
redef record SSL::Info += {
## List of cient certificate CAs accepted by the server
requested_client_certificate_authorities: vector of string &optional &log;
};
event ssl_certificate_request(c: connection, is_client: bool, certificate_types: index_vec, supported_signature_algorithms: SSL::SignatureAndHashAlgorithm, certificate_authorities: string_vec)
{
if ( is_client )
return;
local out: vector of string = vector();
for ( i in certificate_authorities )
out[i] = parse_distinguished_name(certificate_authorities[i]);
c$ssl$requested_client_certificate_authorities = out;
}