HI, On Mi 07 Nov 2018 09:02:11 CET, Matsievskiy S.V. wrote:
Package: remmina-plugin-rdp Version: 1.2.32+dfsg-2 Severity: important Dear Maintainer,remmina-plugin-rdp seems to be affected by issue, described in bug #912206 for freerdp2-x11.Original report:Package: freerdp2-x11 Version: 2.0.0~git20180411.1.7a7b1802+dfsg1-2+b1 Severity: normal Dear Maintainer, After upgrading libssl1.1 from 1.1.0h-4 to 1.1.1-1 xfreerdp is no longer able to connect to a computer running Remote Desktop Services on Windows Server 2008 R2 (with default settings as far as I am aware) using TLS security. Connection fails with the following messages: [ERROR][com.freerdp.core] - freerdp_set_last_error ERRCONNECT_TLS_CONNECT_FAILED [0x00020008] [ERROR][com.freerdp.core.connection] - Error: protocol security negotiation or connection failure Downgrading libssl1.1 to 1.1.0h-4 fixes the issue. To further diagnose the cause, I noticed that the server sends TCP RST in response to the SSL Client Hello message. After some trial and error, I determined that this occurs whenever rsa_pkcs1_sha1 in not the offered signature algorithms, which is the case for SECLEVEL=2 which is the default in the libssl1.1 Debian package since version 1.1.1~~pre6-1. To confirm, this fails: openssl s_client -connect 192.168.0.2:3389 while this works: openssl s_client -cipher DEFAULT@SECLEVEL=1 -connect 192.168.0.2:3389 For further confirmation that rsa_pkcs1_sha1 is responsible, this works: openssl s_client -cipher DEFAULT@SECLEVEL=1 -sigalgs rsa_pkcs1_sha1 -connect 192.168.0.2:3389 while this fails: openssl s_client -cipher DEFAULT@SECLEVEL=1 -sigalgsRSA+SHA512:DSA+SHA512:ECDSA+SHA512:RSA+SHA384:DSA+SHA384:ECDSA+SHA384:RSA+SHA256:DSA+SHA256:ECDSA+SHA256:RSA+SHA224:DSA+SHA224:ECDSA+SHA224:DSA+SHA1:ECDSA+SHA1 -connect192.168.0.2:3389 Applying this discovery, it is possible to make xfreerdp work using: xfreerdp /tls-ciphers:DEFAULT@SECLEVEL=1 However, since most users are unlikely to figure this out on their own, I'd suggest calling SSL_CTX_set_security_level to set the security level to 1 or improving the error message to suggest this workaround. Thanks, Kevin
This issue is probably fixed my today's freerdp2 upload to unstable (2.0.0~git20180411.1.7a7b1802+dfsg1-3).
Please check and report back. Thanks! Mike (co-maintainer+uploader of freerdp2 in Debian) -- DAS-NETZWERKTEAM mike gabriel, herweg 7, 24357 fleckeby mobile: +49 (1520) 1976 148 landline: +49 (4354) 8390 139 GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31 mail: mike.gabriel@das-netzwerkteam.de, http://das-netzwerkteam.de
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