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- 1. _S_e_c_u_r_i_t_y__C_o_n_s_i_d_e_r_a_t_i_o_n_s
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- The array services daemon, arrayd(1M), runs as root. As
- with other system services, if it is configured carelessly
- it is possible for arbitrary and possibly unauthorized users
- to disrupt or even damage a running system.
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- By default, most array commands are executed using the user,
- group and project ID of either the user that issued the
- original command, or else those of a fairly powerless user,
- such as guest. When adding new array commands to
- arrayd.conf, or modifying existing ones, always use the most
- restrictive IDs possible in order to minimize trouble if a
- hostile or careless user were to run that command. Avoid
- adding commands that run with "more powerful" IDs (such as
- user "root" or group "sys") than the user. If such commands
- are necessary, analyze them carefully to ensure that an
- arbitrary user would not be granted any more privileges than
- expected, much the same as one would analyze a "setuid"
- program.
-
- In the default array services configuration, arrayd assumes
- that a remote user will accurately identify itself when
- making a request. In other words, if a request claims to be
- coming from user "abc", arrayd will assume that it is in
- fact from user "abc" and not somebody spoofing "abc". This
- should be adequate for systems that are behind a network
- firewall or otherwise protected from hostile attack, and in
- which all the users inside the firewall are presumed to be
- non-hostile. On systems where this is not the case (for
- example, those that are attached to a public network, or
- where individual machines otherwise cannot be trusted),
- array services authentication should be used. When
- authentication is enabled, all requests from remote systems
- will be authenticated using a mechanism that involves
- private keys that are known only to the super-users on the
- local and remote systems. Requests originating on systems
- that do not have these private keys will be rejected. For
- more details, see the section on "Authentication
- Information" in arrayd.conf(4).
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- arrayd does not support mapping user, group or project names
- between two different namespaces; all members of an array
- are assumed to share the same namespace for users, groups
- and projects. Thus, if systems "A" and "B" are members of
- the same array, then username "abc" on system A is assumed
- to be the same user as username "abc" on system B. This is
- most significant in the case of username "root".
- Authentication should be used if necessary to prevent access
- to an array by machines using a different namespace.
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