Em uma VM de teste do Ubuntu 16.04, eu posso automontar meu homedir (como CIFS neste exemplo, o NFSv4 se comporta de maneira semelhante), mas somente após já fiz login. Aparentemente, o autofs está passando UID=0 em vez do meu UID correto, portanto, é incapaz de obter o ticket de serviço (nomes, endereços IP alterados abaixo para privacidade).
No login:
Sep 26 07:10:47 ubuntu-ad cifs.upcall: key description: cifs.spnego;0;0;39010000;ver=0x2;host=files.univ.edu;ip4=x.x.x.8;sec=krb5;uid=0x0;creduid=0x0;user=user;pid=0x4ba5
Sep 26 07:10:47 ubuntu-ad cifs.upcall: ver=2
Sep 26 07:10:47 ubuntu-ad cifs.upcall: host=files.univ.edu
Sep 26 07:10:47 ubuntu-ad cifs.upcall: ip=x.x.x.8
Sep 26 07:10:47 ubuntu-ad cifs.upcall: sec=1
Sep 26 07:10:47 ubuntu-ad cifs.upcall: uid=0
Sep 26 07:10:47 ubuntu-ad cifs.upcall: creduid=0
Sep 26 07:10:47 ubuntu-ad cifs.upcall: user=user
Sep 26 07:10:47 ubuntu-ad cifs.upcall: pid=19365
Sep 26 07:10:47 ubuntu-ad cifs.upcall: find_krb5_cc: scandir error on directory '/run/user/0': No such file or directory
Sep 26 07:10:47 ubuntu-ad cifs.upcall: find_krb5_cc: considering /tmp/krb5cc_386616_lPzqLb
Sep 26 07:10:47 ubuntu-ad cifs.upcall: find_krb5_cc: /tmp/krb5cc_386616_lPzqLb is owned by 386616, not 0
Sep 26 07:10:47 ubuntu-ad cifs.upcall: krb5_get_init_creds_keytab: -1765328203
Sep 26 07:10:47 ubuntu-ad cifs.upcall: handle_krb5_mech: getting service ticket for files.univ.edu
Sep 26 07:10:47 ubuntu-ad cifs.upcall: cifs_krb5_get_req: unable to get client principal name
Sep 26 07:10:47 ubuntu-ad cifs.upcall: handle_krb5_mech: failed to obtain service ticket (-1765328189)
Sep 26 07:10:47 ubuntu-ad cifs.upcall: Unable to obtain service ticket
Sep 26 07:10:47 ubuntu-ad cifs.upcall: Exit status -1765328189
Sep 26 07:10:47 ubuntu-ad kernel: [639027.427376] CIFS VFS: cifs_mount failed w/return code = -126
Após o login:
Sep 26 07:13:32 ubuntu-ad cifs.upcall: key description: cifs.spnego;0;0;39010000;ver=0x2;host=files.univ.edu;ip4=x.x.x.9;sec=krb5;uid=0x5e638;creduid=0x5e638;user=user;pid=0x4c28
Sep 26 07:13:32 ubuntu-ad cifs.upcall: ver=2
Sep 26 07:13:32 ubuntu-ad cifs.upcall: host=files.univ.edu
Sep 26 07:13:32 ubuntu-ad cifs.upcall: ip=x.x.x.9
Sep 26 07:13:32 ubuntu-ad cifs.upcall: sec=1
Sep 26 07:13:32 ubuntu-ad cifs.upcall: uid=386616
Sep 26 07:13:32 ubuntu-ad cifs.upcall: creduid=386616
Sep 26 07:13:32 ubuntu-ad cifs.upcall: user=user
Sep 26 07:13:32 ubuntu-ad cifs.upcall: pid=19496
Sep 26 07:13:32 ubuntu-ad cifs.upcall: find_krb5_cc: considering /tmp/krb5cc_386616_SsLxA7
Sep 26 07:13:32 ubuntu-ad cifs.upcall: find_krb5_cc: FILE:/tmp/krb5cc_386616_SsLxA7 is valid ccache
Sep 26 07:13:32 ubuntu-ad cifs.upcall: handle_krb5_mech: getting service ticket for files.univ.edu
Sep 26 07:13:32 ubuntu-ad cifs.upcall: handle_krb5_mech: obtained service ticket
Sep 26 07:13:32 ubuntu-ad cifs.upcall: Exit status 0
Como posso obter o autofs para passar o UID / CredUID correto no login?