Created attachment 948919 [details] patch for this problem Description of problem: If "client use spnego principal = yes" is set in smb.conf, smbclient may use the SPNEGO provided principal rather than the user-provided server name. Later Windows versions pass the bogus principal "not_defined_in_RFC4178@please_ignore" here, which should consequently be ignored. cli_session_setup_get_principal() contains code to check this condition, but this code is obviously broken (https://git.samba.org/?p=samba.git;a=blob;f=source3/libsmb/cliconnect.c;h=789a85d5e9df7bed2f8af6b372f2560c599167a9;hb=HEAD#l1649). The code needs to compare the bogus string to "spnego_principal" rather than "principal", which is always NULL at that point of the code. The attached patch solves this problem.
I applied the patch above to samba 4.1.12-5.fc20 and tested successfully.
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