1rpc.gssd(8) System Manager's Manual rpc.gssd(8)
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6 rpc.gssd - rpcsec_gss daemon
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9 rpc.gssd [-f] [-n] [-k keytab] [-p pipefsdir] [-v] [-r] [-d ccachedir]
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12 The rpcsec_gss protocol gives a means of using the gss-api generic
13 security api to provide security for protocols using rpc (in particu‐
14 lar, nfs). Before exchanging any rpc requests using rpcsec_gss, the
15 rpc client must first establish a security context. The linux kernel's
16 implementation of rpcsec_gss depends on the userspace daemon rpc.gssd
17 to establish security contexts. The rpc.gssd daemon uses files in the
18 rpc_pipefs filesystem to communicate with the kernel.
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22 -f Runs rpc.gssd in the foreground and sends output to stderr (as
23 opposed to syslogd)
24 -n By default, rpc.gssd treats accesses by the user with UID 0 spe‐
26 cially, and uses "machine credentials" for all accesses by that
27 user which require Kerberos authentication. With the -n option,
28 "machine credentials" will not be used for accesses by UID 0.
29 Instead, credentials must be obtained manually like all other
30 users. Use of this option means that "root" must manually
31 obtain Kerberos credentials before attempting to mount an nfs
32 filesystem requiring Kerberos authentication.
33 -k keytab
35 Tells rpc.gssd to use the keys found in keytab to obtain
36 "machine credentials". The default value is "/etc/krb5.keytab".
37 Previous versions of rpc.gssd used only "nfs/*" keys found
39 within the keytab. To be more consistent with other implementa‐
40 tions, we now look for specific keytab entries. The search
41 order for keytabs to be used for "machine credentials" is now:
42 root/<hostname>@<REALM>
43 nfs/<hostname>@<REALM>
44 host/<hostname>@<REALM>
45 root/<anyname>@<REALM>
46 nfs/<anyname>@<REALM>
47 host/<anyname>@<REALM>
48 -p path
50 Tells rpc.gssd where to look for the rpc_pipefs filesystem. The
51 default value is "/var/lib/nfs/rpc_pipefs".
52 -d directory
54 Tells rpc.gssd where to look for Kerberos credential files. The
55 default value is "/tmp". This can also be a colon separated
56 list of directories to be searched for Kerberos credential
57 files. Note that if machine credentials are being stored in
58 files, then the first directory on this list is where the
59 machine credentials are stored.
60 -v Increases the verbosity of the output (can be specified multiple
62 times).
63 -r If the rpcsec_gss library supports setting debug level,
65 increases the verbosity of the output (can be specified multiple
66 times).
67 -R realm
69 Kerberos tickets from this realm will be preferred when scanning
70 available credentials cache files to be used to create a con‐
71 text. By default, the default realm, as configured in the Ker‐
72 beros configuration file, is preferred.
73 -t timeout
75 Timeout, in seconds, for kernel gss contexts. This option allows
76 you to force new kernel contexts to be negotiated after timeout
77 seconds, which allows changing Kerberos tickets and identities
78 frequently. The default is no explicit timeout, which means the
79 kernel context will live the lifetime of the Kerberos service
80 ticket used in its creation.
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83 rpc.svcgssd(8)
84
86 Dug Song <dugsong@umich.edu>
87 Andy Adamson <andros@umich.edu>
88 Marius Aamodt Eriksen <marius@umich.edu>
89 J. Bruce Fields <bfields@umich.edu>
90 14 Mar 2007 rpc.gssd(8)