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I can now confirm it's a WolfSSL issue :-(<br>
<br>
I've switched back to release 3.2.016, i.e. before changing to
WolfSSL, and the ISRG Root X1 certificate works perfectly, just as
it should.<br>
<br>
Steve, I remember you included a config option to enable using
WolfSSL, but cannot find it now. Can you give me a pointer, or did
you remove that option later on?<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">Am 28.09.21 um 21:53 schrieb Stephen
Casner:<br>
</div>
<blockquote type="cite"
cite="mid:alpine.OSX.2.21.9999.2109281244430.18922@auge.attlocal.net">
<pre class="moz-quote-pre" wrap="">I wonder if we are hitting a key size limit in the WolfSSL code. I
know there are configuration parameters in user_settings.h for
different SHA sizes, but I don't recall one for RSA keys.
-- Steve
On Tue, 28 Sep 2021, Michael Balzer wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Still no luck, and getting clueless... :-/
Let's Encrypt have a live test server:
<a class="moz-txt-link-freetext" href="https://valid-isrgrootx1.letsencrypt.org/">https://valid-isrgrootx1.letsencrypt.org/</a>
Here's a simple test script to access that server:
(function(){
HTTP.request({
url: <a class="moz-txt-link-rfc2396E" href="https://valid-isrgrootx1.letsencrypt.org/">"https://valid-isrgrootx1.letsencrypt.org/"</a>,
always: function() { JSON.print(this); }
});
})();
Just copy this into the editor and evaluate.
After commenting out the DST certificate from the TLS source, the http request
terminates with an SSL error (-3) with installed...
* self-signed ISRG certificate
* cross-signed ISRG / DST root certificate
* LE R3 certificate
* any combination of these three.
But the access works immediately after reinstalling the old DST root
certificate. There is no DST reference in the chain of that server...
I found another ESP32 project -- not using WolfSSL but the esp-idf SSL & MQTT
lib --; apparently all they needed to do was to add the very same self-signed
ISRG X1 certificate I added:
*
<a class="moz-txt-link-freetext" href="https://github.com/LibreSolar/esp32-edge-firmware/commit/d6b6307cbdb60feb118355fda973eba11d52f8f5">https://github.com/LibreSolar/esp32-edge-firmware/commit/d6b6307cbdb60feb118355fda973eba11d52f8f5</a>
So: why would WolfSSL not use the supplied ISRG certificate? Why would it use
the DST cert without DST being present as an issuer?
The ISRG certificate is the only one having...
signed using : RSA with SHA-256
RSA key size : 4096 bits
But that would surely be supported by WolfSSL, wouldn't it?
I'm running out of ideas, and this really isn't my primary area. Any help is
appreciated.
Regards,
Michael
Am 28.09.21 um 19:15 schrieb Stephen Casner:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Michael,
Certainly within our code as it stands there is not any mechanism to
tell the WolfSSL code to adjust its certificate validation procedure.
The browser certificate substitution that you hypothesize is not clear
to me. I would expect the validation to simply follow the chain.
-- Steve
On Tue, 28 Sep 2021, Michael Balzer wrote:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">More info:
All my browsers already have a builtin ISRG X1 certificate signed by ISRG
only, that's the new version:
<a class="moz-txt-link-freetext" href="https://crt.sh/?id=9314791">https://crt.sh/?id=9314791</a>
My server still sends the ISRG X1 certificate cross signed / issued by DST
Root CA X3. That's the chain it got from Let's Encrypt (via certbot) on
the
last renewal (last month!):
<a class="moz-txt-link-freetext" href="https://crt.sh/?id=3958242236">https://crt.sh/?id=3958242236</a>
Without the DST root cert, WolfSSL then fails validating the DST signed X1
root certificate (I assume):
<a class="moz-txt-link-freetext" href="https://www.wolfssl.com/docs/wolfssl-manual/ch7/">https://www.wolfssl.com/docs/wolfssl-manual/ch7/</a>
My servers will continue sending that chain including the outdated root
cert
probably until the next renewal, so it's possible having added the new X1
root
certificate didn't solve the issue.
The browsers seem to know how to substitute the DST signed certificate by
the
builtin self-signed (?). Is there a similar option in WolfSSL, and do we
need
to enable that?
Steve, can you confirm this, do you know a solution?
Regards,
Michael
Am 28.09.21 um 15:34 schrieb Michael Balzer:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">I've tried adding the intermediate cert ("R3") and then also my site
certificate, that didn't help.
Only adding the DST cert again fixes the connection.
Any ideas?
OVMS# tls trust list
...
ISRG Root X1 length 1939 bytes
1939 byte certificate: ISRG Root X1
cert. version : 3
serial number : 82:10:CF:B0:D2:40:E3:59:44:63:E0:BB:63:82:8B:00
issuer name : C=US, O=Internet Security Research Group, CN=ISRG
Root
X1
subject name : C=US, O=Internet Security Research Group, CN=ISRG
Root
X1
issued on : 2015-06-04 11:04:38
expires on : 2035-06-04 11:04:38
signed using : RSA with SHA-256
RSA key size : 4096 bits
basic constraints : CA=true
key usage : Key Cert Sign, CRL Sign
...
dexter length 1972 bytes
1972 byte certificate: dexter
cert. version : 3
serial number :
04:55:1D:F4:27:A3:7D:E9:E4:A8:5C:37:F6:A1:61:87:3C:E5
issuer name : C=US, O=Let's Encrypt, CN=R3
subject name : CN=dexter.shopdriver.de
issued on : 2021-08-07 05:47:57
expires on : 2021-11-05 05:47:55
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=false
subject alt name : dexter.shopdriver.de, dexters-web.de,
ovms.dexters-web.de, <a class="moz-txt-link-abbreviated" href="http://www.dexter.shopdriver.de">www.dexter.shopdriver.de</a>, <a class="moz-txt-link-abbreviated" href="http://www.dexters-web.de">www.dexters-web.de</a>
key usage : Digital Signature, Key Encipherment
ext key usage : TLS Web Server Authentication, TLS Web Client
Authentication
...
r3 length 1826 bytes
1826 byte certificate: r3
cert. version : 3
serial number : 91:2B:08:4A:CF:0C:18:A7:53:F6:D6:2E:25:A7:5F:5A
issuer name : C=US, O=Internet Security Research Group, CN=ISRG
Root
X1
subject name : C=US, O=Let's Encrypt, CN=R3
issued on : 2020-09-04 00:00:00
expires on : 2025-09-15 16:00:00
signed using : RSA with SHA-256
RSA key size : 2048 bits
basic constraints : CA=true, max_pathlen=0
key usage : Digital Signature, Key Cert Sign, CRL Sign
ext key usage : TLS Web Client Authentication, TLS Web Server
Authentication
Am 28.09.21 um 15:07 schrieb Michael Balzer:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">We would need to bypass / shortcut the "eap" test phase.
But I agree, "master" is stable, I haven't had any issues or reports,
so I
think we could do that. The FreeRTOS timer issue I'm working on only
affects very specific conditions, so not necessary to wait for that.
Should we remove the expiring DST certificate in that release then?
...uh oh: just tried removing the DST certificate: the module cannot
connect to my server anymore...!?
I (490213) ovms-server-v2: Connection is ovms.dexters-web.de:6870
TEST1
I (490213) ovms-server-v2: Status: Connecting...
V (490723) ovms-server-v2:
OvmsServerV2MongooseCallback(MG_EV_CONNECT=-3)
W (490723) ovms-server-v2: Connection failed
E (490723) ovms-server-v2: Status: Error: Connection failed
V (490723) ovms-server-v2: OvmsServerV2MongooseCallback(MG_EV_CLOSE)
I (490723) ovms-server-v2: Status: Disconnected
Am 28.09.21 um 14:32 schrieb Mark Webb-Johnson:
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">Shall we release a full update? The last 3.2?
What we have now in master seems stable.
Mark
</pre>
<blockquote type="cite">
<pre class="moz-quote-pre" wrap="">On 28 Sep 2021, at 5:39 PM, Michael Balzer <a class="moz-txt-link-rfc2396E" href="mailto:dexter@expeedo.de"><dexter@expeedo.de></a>
wrote:
Everyone,
the DST root certificate we include (DST Root CA X3) expires on
September 30, i.e. in two days.
OVMS# tls trust list
DST Root CA X3 length 1200 bytes
1200 byte certificate: DST Root CA X3
cert. version : 3
serial number :
44:AF:B0:80:D6:A3:27:BA:89:30:39:86:2E:F8:40:6B
issuer name : O=Digital Signature Trust Co., CN=DST Root
CA X3
subject name : O=Digital Signature Trust Co., CN=DST Root
CA X3
issued on : 2000-09-30 21:12:19
* expires on : 2021-09-30 14:01:15*
signed using : RSA with SHA1
RSA key size : 2048 bits
basic constraints : CA=true
key usage : Key Cert Sign, CRL Sign
AFAICT, this root certificate is currently used by the OVMS to
validate Let's Encrypt certificates.
*
<a class="moz-txt-link-freetext" href="https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/">https://letsencrypt.org/docs/dst-root-ca-x3-expiration-september-2021/</a>
* <a class="moz-txt-link-freetext" href="https://letsencrypt.org/docs/certificate-compatibility/">https://letsencrypt.org/docs/certificate-compatibility/</a>
Unfortunately, we missed adding the followup LE root certificate
"ISRG
Root X1" in time.
I've just added that certificate to our builtin certificate
repository, but it's too late now to roll out a "main" update in
time
(isn't it?).
So, to prevent losing TLS connectivity with LE servers, users need
to
manually add the ISRG Root X1 certificate to their TLS
repositories.
I've added a section on this to our user manual:
* <a class="moz-txt-link-freetext" href="https://docs.openvehicles.com/en/latest/userguide/ssltls.html">https://docs.openvehicles.com/en/latest/userguide/ssltls.html</a>
If users contact you, point them to that page.
We probably should also remove the expired DST root certificate
after
September 30.
Regards,
Michael
--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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Fon 02333 / 833 5735 * Handy 0176 / 206 989 26
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--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26</pre>
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<pre class="moz-signature" cols="72">--
Michael Balzer * Helkenberger Weg 9 * D-58256 Ennepetal
Fon 02333 / 833 5735 * Handy 0176 / 206 989 26</pre>
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