On 19/11/20 4:48 am, Niels Hofmans wrote:
Hi guys,
I am trying to setup squid with TLS intercaption on Docker in an alpine
linux image.
My configuration is as follows:
access_log /dev/stdout
Not a great idea. stdout is process specific ... and Squid is a
collection of multiple processes that can change over time.
You can use TCP logging if you need to stream the data out of the
container. see <https://wiki.squid-cache.org/Features/LogModules> for
details.
https_port 0.0.0.0:3128 \
intercept \
ssl-bump \
cert=/ca.pem \
generate-host-certificates=on \
dynamic_cert_mem_cache_size=500MB
sslcrtd_program /usr/lib/squid/security_file_certgen -s /cache/ssl.db -M 100MB
sslcrtd_children 5
ssl_bump server-first all
sslproxy_cert_error allow all
These indicate that you are using a Squid-3.4 or older. Please upgrade
to at least Squid-4. Ideally Squid-5 (beta) or even Squid-6 (alpha) for
best TLS behaviour.
And the Dockerfile:
FROM alpine
RUN apk add -U --no-cache squid
COPY cmd/config/ca.pem cmd/config/squid.conf /
RUN mkdir -p /cache \
&& /usr/lib/squid/security_file_certgen -c -s /cache/ssl.db -M 100MB
EXPOSE 3128
ENTRYPOINT ["/usr/sbin/squid”, “-f”, "/squid.conf”]
However, this always exits with following error:
proxy_1 | [00] 2020/11/18 15:38:27| WARNING: BCP 177 violation.
Detected non-functional IPv6 loopback.
proxy_1 | [00] 2020/11/18 15:38:27| FATAL: No valid signing
certificate configured for HTTPS_port 0.0.0.0:3128
proxy_1 | [00] 2020/11/18 15:38:27| Squid Cache (Version 4.13):
Terminated abnormally.
proxy_1 | [00] CPU Usage: 0.036 seconds = 0.021 user + 0.014 sys
proxy_1 | [00] Maximum Resident Size: 42256 KB
proxy_1 | [00] Page faults with physical i/o: 0
And cmd/config <http://config.ca>/ca.pem was created with the command
from the wiki on macOS: openssl req -new -newkey rsa:1024 -days 365
-nodes -x509 -keyout ca.pem -out ca.pem
Any ideas? Thanks!
That command generates a regular server certificate. SSL-Bump needs a CA
certificate.
Here are the correct command(s) for generating a root CA certificate for
Squid and DER file for client install:
<https://wiki.squid-cache.org/ConfigExamples/Intercept/SslBumpExplicit#Usage>
Note: most of the rest of that page can be used as instructions for your
setup. The only notable difference is the http(s)_port line settings,
your current one is correct for an MITM proxy.
Amos
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