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RFC 6331 documents a number of serious security weaknesses in the SASL DIGEST-MD5 mechanism. As such, libvirtd should not by using it as a default mechanism. GSSAPI is the only other viable SASL mechanism that can provide secure session encryption so enable that by defalt as the replacement. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
46 lines
1.7 KiB
Plaintext
46 lines
1.7 KiB
Plaintext
# If you want to use the non-TLS socket, then you *must* pick a
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# mechanism which provides session encryption as well as
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# authentication.
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#
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# If you are only using TLS, then you can turn on any mechanisms
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# you like for authentication, because TLS provides the encryption
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#
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# If you are only using UNIX, sockets then encryption is not
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# required at all.
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#
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# Since SASL is the default for the libvirtd non-TLS socket, we
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# pick a strong mechanism by default.
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#
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# NB, previously DIGEST-MD5 was set as the default mechanism for
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# libvirt. Per RFC 6331 this is vulnerable to many serious security
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# flaws and should no longer be used. Thus GSSAPI is now the default.
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#
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# To use GSSAPI requires that a libvirtd service principal is
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# added to the Kerberos server for each host running libvirtd.
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# This principal needs to be exported to the keytab file listed below
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mech_list: gssapi
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# If using a TLS socket or UNIX socket only, it is possible to
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# enable plugins which don't provide session encryption. The
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# 'scram-sha-1' plugin allows plain username/password authentication
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# to be performed
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#
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#mech_list: scram-sha-1
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#
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# You can also list many mechanisms at once, then the user can choose
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# by adding '?auth=sasl.gssapi' to their libvirt URI, eg
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# qemu+tcp://hostname/system?auth=sasl.gssapi
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#mech_list: scram-sha-1 gssapi
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# Some older builds of MIT kerberos on Linux ignore this option &
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# instead need KRB5_KTNAME env var.
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# For modern Linux, and other OS, this should be sufficient
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#
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keytab: /etc/libvirt/krb5.tab
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# If using scram-sha-1 for username/passwds, then this is the file
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# containing the passwds. Use 'saslpasswd2 -a libvirt [username]'
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# to add entries, and 'sasldblistusers2 -f [sasldb_path]' to browse it
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#sasldb_path: /etc/libvirt/passwd.db
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