UPMC Certificates

UPMC man in the middle's https traffic. You might get the error on the terminal (from e.g. curl)

SSLError(SSLCerVerificationError, '[SSL: CERTIFICATE_VERIFY_FAILED] certifiacte verify failed: self signed certificate in certificate chain

or this message in firefox

Software is Preventing Firefox From Safely Connecting to This Site

Download UPMC-ROOT-CA.crt and import into Firefox like (instructions copied from here)

1. top right hamberger menu
2. options
3. scroll to Privacy & Security 's Certificates Section
4. Click View Certificates…
5. Authorities and Import

for CLI and terminal programs, you can accept the certificate across the system.

To allow UPMC's cert in the SSL chain on debian, run:

  # as root
  cd /usr/local/share/ca-certificates/
  cert_loc=http://upmccrl.upmc.com/CDP/
  for crt in UPMC-CA23 UPMC-CA20 UPMC-ROOT-CA; do
     wget "$cert_loc/$crt.crt" -O "$crt.crt-der"
     # added 20230707
     openssl x509 -in $crt.crt-der -out $crt.crt -outform PEM
  done
  update-ca-certificates

Newer (2023) ssl libraries packaged in debian are ahead of what UPMC's certs/network supports.

ss1.SSLError: [SSL: UNSAFE_LEGACY_RENEGOTIATION_DISABLED] unsafe legacy renegotiation disabled

See https://stackoverflow.com/questions/71603314/ssl-error-unsafe-legacy-renegotiation-disabled

Downgrade security with a custom SSL config:

export OPENSSL_CONF="/opt/ni_tools/slacktheme_bot/openssl.conf"

where conf looks like

openssl_conf = openssl_init

[openssl_init]
ssl_conf = ssl_sect

[ssl_sect]
system_default = system_default_sect

[system_default_sect]
Options = UnsafeLegacyRenegotiation

newer urllib3 may also cause problems with legacy certs. (UNCONFIRMED 20240117)

pip install urllib3==1.26.12

For python virtual enviornments, you may also want to manually append certificates to cacert.pem bundled with certifi

pycert=$(python -c 'import certifi,os; print(os.readlink(os.path.dirname(certifi.__file__)+"/cacert.pem"))')

cat $newcert_pem >> $pycert

(Will note: cirtifi munged also useful for mitmproxy)