| 1 | <samba:parameter name="username"
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| 2 | context="S"
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| 3 | type="string"
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| 4 | xmlns:samba="http://www.samba.org/samba/DTD/samba-doc">
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| 5 | <synonym>user</synonym>
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| 6 | <synonym>users</synonym>
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| 7 | <description>
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| 8 | <para>Multiple users may be specified in a comma-delimited
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| 9 | list, in which case the supplied password will be tested against
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| 10 | each username in turn (left to right).</para>
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| 11 |
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| 12 | <para>The <parameter moreinfo="none">username</parameter> line is needed only when
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| 13 | the PC is unable to supply its own username. This is the case
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| 14 | for the COREPLUS protocol or where your users have different WfWg
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| 15 | usernames to UNIX usernames. In both these cases you may also be
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| 16 | better using the \\server\share%user syntax instead.</para>
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| 17 |
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| 18 | <para>The <parameter moreinfo="none">username</parameter> line is not a great
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| 19 | solution in many cases as it means Samba will try to validate
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| 20 | the supplied password against each of the usernames in the
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| 21 | <parameter moreinfo="none">username</parameter> line in turn. This is slow and
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| 22 | a bad idea for lots of users in case of duplicate passwords.
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| 23 | You may get timeouts or security breaches using this parameter
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| 24 | unwisely.</para>
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| 25 |
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| 26 | <para>Samba relies on the underlying UNIX security. This
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| 27 | parameter does not restrict who can login, it just offers hints
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| 28 | to the Samba server as to what usernames might correspond to the
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| 29 | supplied password. Users can login as whoever they please and
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| 30 | they will be able to do no more damage than if they started a
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| 31 | telnet session. The daemon runs as the user that they log in as,
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| 32 | so they cannot do anything that user cannot do.</para>
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| 33 |
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| 34 | <para>To restrict a service to a particular set of users you
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| 35 | can use the <smbconfoption name="valid users"/> parameter.</para>
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| 36 |
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| 37 | <para>If any of the usernames begin with a '@' then the name
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| 38 | will be looked up first in the NIS netgroups list (if Samba
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| 39 | is compiled with netgroup support), followed by a lookup in
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| 40 | the UNIX groups database and will expand to a list of all users
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| 41 | in the group of that name.</para>
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| 42 |
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| 43 | <para>If any of the usernames begin with a '+' then the name
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| 44 | will be looked up only in the UNIX groups database and will
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| 45 | expand to a list of all users in the group of that name.</para>
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| 46 |
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| 47 | <para>If any of the usernames begin with a '&' then the name
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| 48 | will be looked up only in the NIS netgroups database (if Samba
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| 49 | is compiled with netgroup support) and will expand to a list
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| 50 | of all users in the netgroup group of that name.</para>
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| 51 |
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| 52 | <para>Note that searching though a groups database can take
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| 53 | quite some time, and some clients may time out during the
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| 54 | search.</para>
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| 55 |
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| 56 | <para>See the section <link linkend="VALIDATIONSECT">NOTE ABOUT
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| 57 | USERNAME/PASSWORD VALIDATION</link> for more information on how
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| 58 | this parameter determines access to the services.</para>
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| 59 | </description>
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| 60 |
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| 61 | <value type="default"><comment>The guest account if a guest service,
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| 62 | else <empty string>.</comment></value>
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| 63 |
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| 64 | <value type="example">fred, mary, jack, jane, @users, @pcgroup</value>
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| 65 | </samba:parameter>
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