TLS: PKCS 12 support

[MrAnno]

The new pkcs12-file() TLS option can be used to specify a PKCS #12 file container that can store
a private key, a certificate and CA certs.
pkcs12-file() works together with the ca-dir() option, but this is optional since the p12 file may contain CA certificates as well.

If this option is used in the configuration file, the value of key-file() and cert-file() will be omitted.
Passphrase is currently not supported.

Example:

openssl pkcs12 -export -inkey serverkey.pem -in servercert.pem -certfile cacert.pem -out server.p12

Example config:

source s_tls {
    syslog(
        transport(tls)
        tls(
            pkcs12-file("/path/to/server.p12")
            ca-dir("/path/to/cadir") # optional
            peer-verify(yes)
        )
    );
};

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[lbudai]

Could you factor out a static PKCS12 *_load_pkcs12_file(const gchar *filename); function?

[MrAnno]

Of course :)

[MrAnno]

Done.

[lbudai]

What do you think about a static gboolean _load_pkcs12_content(PKCS12 *pkcs12, EVP_PKEY **private_key, X509 **cert,STACK_OF(X509) **ca_list); function?

[MrAnno]

I like it. :) The only reason I had this complexity in one single function was the fact that this module is already full of helper functions from different levels of abstractions.

Should I place these functions to the OpenSSL compat layer or just create a openssl_utils unit?

[lbudai]

I think it can goes to the compat layer.

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[furiel]

Let's signal error when both p12 and cert/keys are provided in the config.

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[MrAnno]

@furiel Good idea, thanks.

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions

[kira-syslogng]

Build SUCCESS, the tests were executed on test branch: master and test suite: functions