I asked upstream about this. Bjarni suggested it perhaps was related to
the use of StartSSL certificates and pointed me to
<URL: http://pagekite.net/2016-11-22/Pagekite_py_0_5_9,_CA_trust_issue >.
I tested by using the StartCom/StartSSL CA certificates, and it did
indeed solve the problem. I guess Debian removed the relevant
certificates from Stretch? This changelog from ca-certificates seem
relevant, but I do not quite understand what the effect of the change
is:
ca-certificates (20161130+nmu1) unstable; urgency=medium
* Non-maintainer upload.
* Add StartCom and WoSign certificates to mozilla/blacklist.txt as they are
now untrusted by the major browser vendors. Closes: #858539
-- Chris Lamb <la...@debian.org> Fri, 19 May 2017 16:53:16 +0200
I am not quite sure exactly which certificate is used, but this is the
change I implemented to solve the problem.
diff --git a/pagekite.d/20_frontends.rc b/pagekite.d/20_frontends.rc
index d0604ae..39c9556 100644
--- a/pagekite.d/20_frontends.rc
+++ b/pagekite.d/20_frontends.rc
@@ -7,6 +7,7 @@
# Use the pagekite.net service defaults.
defaults
+ca_certs=/etc/pagekite.d/cacert-startssl.pem
# If you want to use your own, use something like:
# frontend = hostname:port
diff --git a/pagekite.d/cacert-startssl.pem b/pagekite.d/cacert-startssl.pem
new file mode 100644
index 0000000..6cd55c7
--- /dev/null
+++ b/pagekite.d/cacert-startssl.pem
@@ -0,0 +1,142 @@
+##
+## Bundle of CA Root Certificates
+##
+## Certificate data from Mozilla as of: Wed Jan 18 04:12:05 2017 GMT
+##
+## This is a bundle of X.509 certificates of public Certificate Authorities
+## (CA). These were automatically extracted from Mozilla's root certificates
+## file (certdata.txt). This file can be found in the mozilla source tree:
+##
https://hg.mozilla.org/releases/mozilla-release/raw-file/default/security/nss/lib/ckfw/builtins/certdata.txt
+##
+## It contains the certificates in PEM format and therefore
+## can be directly used with curl / libcurl / php_curl, or with
+## an Apache+mod_ssl webserver for SSL client authentication.
+## Just configure this file as the SSLCACertificateFile.
+##
+## Conversion done with mk-ca-bundle.pl version 1.27.
+## SHA256: dffa79e6aa993f558e82884abf7bb54bf440ab66ee91d82a27a627f6f2a4ace4
+##
+
+StartCom Certification Authority
+================================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+
+Taiwan GRCA
+===========
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+-----END CERTIFICATE-----
+
+StartCom Certification Authority
+================================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
+
+StartCom Certification Authority G2
+===================================
+-----BEGIN CERTIFICATE-----
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+-----END CERTIFICATE-----
--
Happy hacking
Petter Reinholdtsen
