acme-dns VS OpenSSL

Getting a wildcard certificate from LE might be a better option, depending on how easy the extra bit of if plumbing is with your lab setup.

You need to use DNS based domain identification, and once you have a cert distribute it to all your services. The former can be automated using various common tools (look at https://github.com/joohoi/acme-dns, self-hosted unless you are only securing toys you don't really care about, if you self host DNS or your registrar doesn't have useful API access) or you can leave that as an every ~ten weeks manual job, the latter involves scripts to update you various services when a new certificate is available (either pushing from where you receive the certificate or picking up from elsewhere). I have a little VM that holds the couple of wildcard certificates (renewing them via DNS01 and acmedns on a separate machine so this one is impossible to see from the outside world), it pushes the new key and certificate out to other hosts (simple SSH to copy over then restart nginx/Apache/other).

Of course you may decide that the shin if your own CA is easier than setting all this up, as you can sign long lived certificates for yourself. I prefer this because I don't need to switch to something else if I decide to give friends/others access to something.

As someone else said, it’s a huge pain to run your own dns services. However, if you want some separation, I recently saw https://github.com/joohoi/acme-dns

v0.9.1 is out and natively supports both https://github.com/joohoi/acme-dns and any dns provider available in https://github.com/acmesh-official/acme.sh

I have set up an acme-dns server to answer ACME DNS Challenges: https://github.com/joohoi/acme-dns

The DNS challenge can be easily automated using https://github.com/joohoi/acme-dns - you do need an IP you can run a DNS server on though.

If your server is not accessible over the internet, you can still use Let's Encrypt or ZeroSSL to get a certificate. You'll just need to set up a DNS Challenge for things to work. This is a little more complicated, but can work even if your DNS provider doesn't have an API. For example, I use Google Domains and Google DNS (not cloud DNS) for my DNS server, but I've got an instance of acme-dns running on VPS box that handles the DNS auth for me. It's how every machine on my local network has valid certificates - but I annoyingly need to renew them every 90 days.

It's a bit more involved, but you can set up wildcard certificates to update automatically. Certbot has some pre-made plugins for this for several DNS providers. If yours is not on that list, there's a tool called acme-dns which is a minimal DNS server you can run on your server and delegate _acme-challenge.yourdomain.com to. If you don't want to run that on your own, you can also use the publicly hosted server/API for it.

In case you're not already familiar with it: one thing I'd recommend is using https://github.com/joohoi/acme-dns to obtain the certificates. You basically just point the subdomain you need wildcard certs for at that DNS server (a one time thing, ie you don't have to do this every three months), and the related tool https://github.com/acme-dns/acme-dns-client can get the certificates in a nice, automated, way without you ever having to expose the private reverse proxy to the Internet.

ENV OPENSSL_PREFIX=/opt/openssl ENV SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt WORKDIR /tmp RUN git clone --branch OpenSSL_1_0_2n https://github.com/openssl/openssl.git RUN cd openssl RUN ./config shared --prefix=$OPENSSL_PREFIX --openssldir=$OPENSSL_PREFIX/ssl RUN make RUN make install RUN rvm install 2.6.0 -C --with-openssl-dir=$OPENSSL_PREFIX ENV PATH /usr/local/rvm/bin:$PATH RUN rvm --default use ruby-2.6.0 ENV PATH /usr/local/rvm/bin:/usr/local/rvm/rubies/ruby-2.6.0/bin:$PATH ENV GEM_HOME /usr/local/rvm/rubies/ruby-2.6.0/lib/ruby/gems/2.6.0

Today, April 7th, 2024, marks the 10-year anniversary since CVE-2014-0160 was published. This security vulnerability known as "Heartbleed" was a flaw in the OpenSSL cryptography software, the most popular option to implement Transport Layer Security (TLS). In more layman's terms, if you type https:// in your browser address bar, chances are high that you are interacting with OpenSSL.

At this point I pretty much understand the entire process on how the xz backdoor came to be: its execution stages, extraction from binary "test" files etc. But one thing puzzles me: how can the ifunc mechanism be used to replace something like RSA_public_decrypt? Granted this probably stems from my lack of understanding of ifunc, but I was under the impression that in order for the ifunc mechanism to work in your code, you have to explicitly mark specific function with multiple implementations with __attribute__ ((ifunc ("the_resolver_function"))). Looking at the source code of the RSA function in question, ifunc attribute isn't present:

https://github.com/openssl/openssl/blob/master/crypto/rsa/rsa_crpt.c#L51

So how does the backdoor actually replace the call? Does this means that the ifunc mechanism can be used to override pretty much anything on the system?

OpenSSL and Go crypt/tls has no support yet, so none of the webservers that depend on them support it. Apache, Nginx, and Caddy, they all need upstream ECH support first.

- https://github.com/openssl/openssl/issues/7482

- https://github.com/openssl/openssl/pull/22938

- https://github.com/golang/go/issues/63369

If I'm understanding the draft correctly, I think the webserver you're hosting your sites on would need it implemented as it requires private keys and ECH configuration. In the example of nginx since it uses openssl, openssl would need to implement it. I found an issue on their Github but it's still open: https://github.com/openssl/openssl/issues/7482

I confirmed that the systm was on 1.1.1f with openssl version command. Hmm...... I check the openssl version in the repo with apt list... LOL package names wernt helpful. finally went to the repo pages and found that its still on 1.1.1f, https://launchpad.net/ubuntu/+source/openssl. Meenwhile I looked up the version history on https://www.openssl.org/ and saw that 1.1.1v was released at the beginning of this month... ok. I can understand it it was out less then 30 days. I looked up when f came out, end of MARCH 2020. NEARLY 3-1/2 YEARS