1SSERVER(8) MIT Kerberos SSERVER(8)
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6 sserver - sample Kerberos version 5 server
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9 sserver [ -p port ] [ -S keytab ] [ server_port ]
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12 sserver and sclient(1) are a simple demonstration client/server appli‐
13 cation. When sclient connects to sserver, it performs a Kerberos au‐
14 thentication, and then sserver returns to sclient the Kerberos princi‐
15 pal which was used for the Kerberos authentication. It makes a good
16 test that Kerberos has been successfully installed on a machine.
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18 The service name used by sserver and sclient is sample. Hence, sserver
19 will require that there be a keytab entry for the service sample/host‐
20 name.domain.name@REALM.NAME. This keytab is generated using the kad‐
21 min(1) program. The keytab file is usually installed as
22 FILE:/etc/krb5.keytab.
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24 The -S option allows for a different keytab than the default.
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26 sserver is normally invoked out of inetd(8), using a line in /etc/in‐
27 etd.conf that looks like this:
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29 sample stream tcp nowait root /usr/local/sbin/sserver sserver
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31 Since sample is normally not a port defined in /etc/services, you will
32 usually have to add a line to /etc/services which looks like this:
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34 sample 13135/tcp
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36 When using sclient, you will first have to have an entry in the Ker‐
37 beros database, by using kadmin(1), and then you have to get Kerberos
38 tickets, by using kinit(1). Also, if you are running the sclient pro‐
39 gram on a different host than the sserver it will be connecting to, be
40 sure that both hosts have an entry in /etc/services for the sample tcp
41 port, and that the same port number is in both files.
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43 When you run sclient you should see something like this:
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45 sendauth succeeded, reply is:
46 reply len 32, contents:
47 You are nlgilman@JIMI.MIT.EDU
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50 1. kinit returns the error:
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52 kinit: Client not found in Kerberos database while getting
53 initial credentials
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55 This means that you didn't create an entry for your username in the
56 Kerberos database.
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58 2. sclient returns the error:
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60 unknown service sample/tcp; check /etc/services
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62 This means that you don't have an entry in /etc/services for the
63 sample tcp port.
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65 3. sclient returns the error:
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67 connect: Connection refused
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69 This probably means you didn't edit /etc/inetd.conf correctly, or
70 you didn't restart inetd after editing inetd.conf.
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72 4. sclient returns the error:
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74 sclient: Server not found in Kerberos database while using
75 sendauth
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77 This means that the sample/hostname@LOCAL.REALM service was not de‐
78 fined in the Kerberos database; it should be created using kad‐
79 min(1), and a keytab file needs to be generated to make the key for
80 that service principal available for sclient.
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82 5. sclient returns the error:
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84 sendauth rejected, error reply is:
85 "No such file or directory"
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87 This probably means sserver couldn't find the keytab file. It was
88 probably not installed in the proper directory.
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91 See kerberos(7) for a description of Kerberos environment variables.
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94 sclient(1), kerberos(7), services(5), inetd(8)
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97 MIT
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100 1985-2021, MIT
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1051.19.1 SSERVER(8)