I have encountered a bug in Stunnel version 3.50. I have a setup with two computers (Server and Client) connected using Stunnel. The client is using a hardware token through the CAPI engine to authenticate itself to a server, using a config file:

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LOG3[0]: error queue: 141F0006: error:141F0006:SSL routines:tls_construct_cert_verify:EVP lib LOG3[0]: SSL_connect: 8006F074: error:8006F074:lib(128):capi_rsa_priv_enc:function not supported
LOG5[0]: Connection reset: 0 byte(s) sent to TLS, 0 byte(s) sent to socket

It is quite possible the problem is caused by the CAPI engine itself. I was experimenting with OpenSSL 1.1.1a some time back, trying to compile my own library files, and I just couldn't to get CAPI to work at all - the libraries themselves compiled OK and worked fine, but the CAPI engine just wouldn't work (while it was OK with OpenSSL 1.0.2q); the only way I could get CAPI to work with OpenSSL 1.1.1a was to use the 1.1.1a libraries and the 1.0.2q capi.dll. However, I am far from an expert on compiling OpenSSL, so I may have gotten it completely wrong.

Could someone please verify that their CAPI engine is working with Stunnel? Also, it may be worth trying to compile a 64bit CAPI.dll from version 1.0.2q just to see if it might start working - in that case, a bug report to OpenSSL may be in order.


Hello,
I was able to replicate this error with Stunnel 5.50 when trying to connect to a server built with OpenSSL 1.1.1a. Stunnel 5.50 (client) correctly connects to a server built with OpenSSL older than 1.1.1
How did you get 1.0.2q capi.dll to work with OpenSSL 1.1.1a?
I placed 1.0.2q capi.dll in the stunnel/engines folder but it didn’t work.

Best regards,
Małgorzata Olszówka
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