As an additional data point, I've run into the same issue for certificates signed using RSA-SHA256.
When using "gnutls-cli -p 636 ldap --priority 'SECURE256'", I get an error back stating that "The signature algorithm is not supported". If I change the priority string to 'SECURE256:+SIGN-ALL', I am able to establish a connection. Even stranger, the priority string 'SECURE256 :+SIGN-RSA-SHA256' gives me an error stating "The signature algorithm is not supported". It's almost as if the default signature algorithms changed behind the scenes, breaking everything during an unattended-upgrade. Additionally, setting the signature algorithm directly doesn't work. This is occurring for the following versions of gnutls-cli: * 2.12.14-5ubuntu3.11 * 2.12.23-12ubuntu2.4 -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to gnutls26 in Ubuntu. https://bugs.launchpad.net/bugs/1534230 Title: LDAP TLS connection stopped working Status in gnutls26 package in Ubuntu: Invalid Bug description: My LDAP authentication stopped working with the error: "The signature algorithm is not supported" This is GNUTLS Error code: -106 GNUTLS_E_UNSUPPORTED_SIGNATURE_ALGORITHM LDAP search reproduces it: $ ldapsearch -H ldaps://xxx.xxx.gov/ -b "OU=xxx" -x -d1 ldap_url_parse_ext(ldaps://xxx.xxx.gov/) ldap_create ldap_url_parse_ext(ldaps://xxx.xxx.gov:636/??base) ldap_sasl_bind ldap_send_initial_request ldap_new_connection 1 1 0 ldap_int_open_connection ldap_connect_to_host: TCP xxx.xxx.gov:636 ldap_new_socket: 3 ldap_prepare_socket: 3 ldap_connect_to_host: Trying 128.219.164.41:636 ldap_pvt_connect: fd: 3 tm: -1 async: 0 TLS: can't connect: The signature algorithm is not supported.. ldap_err2string ldap_sasl_bind(SIMPLE): Can't contact LDAP server (-1) It looks like the SHA1 support was removed from gnutls26... Other packages: ldap-utils: Version: 2.4.31-1+nmu2ubuntu8.2 libsasl2-2: Version: 2.1.25.dfsg1-17build1 libldap-2.4-2: Version: 2.4.31-1+nmu2ubuntu8.2 ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: libgnutls26 2.12.23-12ubuntu2.4 ProcVersionSignature: Ubuntu 3.13.0-75.119-generic 3.13.11-ckt32 Uname: Linux 3.13.0-75-generic x86_64 NonfreeKernelModules: fglrx ApportVersion: 2.14.1-0ubuntu3.19 Architecture: amd64 CurrentDesktop: Unity Date: Thu Jan 14 11:38:36 2016 InstallationDate: Installed on 2014-10-08 (462 days ago) InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2) SourcePackage: gnutls26 UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnutls26/+bug/1534230/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
