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| author | Laurent Bercot <ska-skaware@skarnet.org> | 2015-01-15 20:51:39 +0000 |
|---|---|---|
| committer | Laurent Bercot <ska-skaware@skarnet.org> | 2015-01-15 20:51:39 +0000 |
| commit | ebfd0ba17e0d4b220725018d16e294e8e22a1745 (patch) | |
| tree | 4b29683050ce9e8f24f1920f1be38b2f837ef5ad /doc/s6-ipcserver-access.html | |
| parent | 20c7d8e1b328155145ce9e8648435e127b60c208 (diff) | |
| download | s6-networking-ebfd0ba17e0d4b220725018d16e294e8e22a1745.tar.xz | |
Move Unix domain socket and access control stuff to s6.
Move seekablepipe to s6-portable-utils.
Version: 2.0.1.0, release candidate
Diffstat (limited to 'doc/s6-ipcserver-access.html')
| -rw-r--r-- | doc/s6-ipcserver-access.html | 172 |
1 files changed, 0 insertions, 172 deletions
diff --git a/doc/s6-ipcserver-access.html b/doc/s6-ipcserver-access.html deleted file mode 100644 index 515138c..0000000 --- a/doc/s6-ipcserver-access.html +++ /dev/null @@ -1,172 +0,0 @@ -<html> - <head> - <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> - <meta http-equiv="Content-Language" content="en" /> - <title>s6-networking: the s6-ipcserver-access program</title> - <meta name="Description" content="s6-networking: the s6-ipcserver-access program" /> - <meta name="Keywords" content="s6-networking s6-tcpserver-access unix access control ipcrules" /> - <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> --> - </head> -<body> - -<p> -<a href="index.html">s6-networking</a><br /> -<a href="http://skarnet.org/software/">Software</a><br /> -<a href="http://skarnet.org/">skarnet.org</a> -</p> - -<h1> The <tt>s6-ipcserver-access</tt> program </h1> - -<p> -<tt>s6-ipcserver-access</tt> is a command-line access -control tool for Unix domain sockets on systems where the -<a href="http://www.superscript.com/ucspi-ipc/getpeereid.html">getpeereid()</a> system call can be implemented. -It is meant to be run after -<a href="s6-ipcserverd.html">s6-ipcserverd</a> and before -the application program on the s6-ipcserver command line. -</p> - -<h2> Interface </h2> - -<pre> - s6-ipcserver-access [ -v <em>verbosity</em> ] [ -E | -e ] [ -l <em>localname</em> ] [ -i <em>rulesdir</em> | -x <em>rulesfile</em> ] <em>prog...</em> -</pre> - -<ul> - <li> s6-ipcserver-access checks it is run under a UCSPI server tool -such as <a href="s6-ipcserver.html">s6-ipcserver</a>. - <li> It checks that the remote end of the connection fits the -accepted criteria defined by the database contained in <em>rulesdir</em> -or <em>rulesfile</em>. If the database tells it to reject the connection, -the program exits 1. </li> - <li> It sets up a few additional environment variables. </li> - <li> It executes into <em>prog...</em>, -unless the first matching rule in the rule database -includes instructions to override <em>prog...</em>. </li> -</ul> - -<h2> Environment variables </h2> - -<p> -s6-ipcserver-access expects to inherit some environment variables from -its parent: -</p> - -<ul> - <li> PROTO: normally IPC, but could be anything else, like UNIX. </li> - <li> ${PROTO}REMOTEEUID: the effective UID of the client program connecting to the socket. </li> - <li> ${PROTO}REMOTEEGID: the effective GID of the client program connecting to the socket. </li> -</ul> - -<p> - Additionally, it exports the following variables before executing into -<em>prog...</em>: -</p> - -<ul> - <li> ${PROTO}LOCALPATH: set to the local "address" of the socket, as -reported by the -<a href="http://pubs.opengroup.org/onlinepubs/9699919799/functions/getsockname.html">getsockname()</a> -system call, truncated to 99 characters max. </li> -</ul> - -<p> - Also, the access rules database can instruct s6-ipcserver-access to set -up, or unset, more environment variables, depending on the client address. -</p> - -<h2> Options </h2> - -<ul> - <li> <tt>-v <em>verbosity</em></tt> : be more or less verbose, i.e. -print more or less information to stderr: - <ul> - <li> 0: only log error messages. </li> - <li> 1: only log error and warning messages, and accepted connections. -This is the default. </li> - <li> 2: also log rejected connections and more warning messages. </li> - </ul> </li> - <li> <tt>-E</tt> : no environment. All environment variables potentially -set by s6-ipcserver-access, as well as those set by -<a href="s6-ipcserver.html">s6-ipcserver</a>, will be unset instead. </li> - <li> <tt>-e</tt> : set up environment variables normally. -This is the default. </li> - <li> <tt>-l <em>localname</em></tt> : use <em>localname</em> -as the value for the ${PROTO}LOCALPATH environment variable, instead of -looking it up via getsockname(). </li> - <li> <tt>-i <em>rulesdir</em></tt> : check client credentials -against a filesystem-based database in the <em>rulesdir</em> directory. </li> - <li> <tt>-x <em>rulesfile</em></tt> : check client credentials -against a <a href="http://en.wikipedia.org/wiki/Cdb_(software)">cdb</a> -database in the <em>rulesfile</em> file. <tt>-i</tt> and <tt>-x</tt> are -mutually exclusive. If none of those options is given, no credential checking will be -performed, and a warning will be emitted on every connection if -<em>verbosity</em> is 2 or more. </li> -</ul> - -<h2> Access rule checking </h2> - -<p> - s6-ipcserver-access checks its client connection against -a ruleset. This ruleset can be implemented: -</p> - -<ul> - <li> either in the filesystem as an arborescence of directories and files, -if the <tt>-i</tt> option has been given. This option is the most flexible -one: the directory format is simple enough for scripts to understand and -modify it, and the ruleset can be changed dynamically. This is practical, -for instance, for roaming users. </li> -<li> or in a <a href="http://en.wikipedia.org/wiki/Cdb_(software)">CDB -file</a>, if the <tt>-x</tt> option has been given. This option is the most -efficient one if the ruleset is static enough: a lot less system calls are -needed to perform searches in a CDB than in the filesystem. </li> -</ul> - -<p> - The exact format of the ruleset is described on the -<a href="s6-accessrules-cdb-from-fs.html">s6-accessrules-cdb-from-fs</a> page. -</p> - -<p> -s6-ipcserver-access first reads the client UID <em>uid</em> and -GID <em>gid</em> from the -${PROTO}REMOTEEUID and ${PROTO}REMOTEEGID environment variables, and checks -them with the -<a href="libs6net/accessrules.html#uidgid">s6net_accessrules_keycheck_uidgid()</a> -function. In other words, it tries to match: - -<ul> - <li> <tt>uid/</tt><em>uid</em> </li> - <li> <tt>gid/</tt><em>gid</em> </li> - <li> <tt>uid/default</tt> </li> -</ul> - -<p> - in that order. If no S6NET_ACCESSRULES_ALLOW result can be obtained, -the connection is denied. -</p> - -<h2> Environment and executable modifications </h2> - -<p> - s6-ipcserver-access interprets non-empty <tt>env</tt> subdirectories -and <tt>exec</tt> files -it finds in the first matching rule of the ruleset, as explained -in the <a href="s6-accessrules-cdb-from-fs.html">s6-accessrules-cdb-from-fs</a> -page. -</p> - -<ul> - <li> An <tt>env</tt> subdirectory is interpreted as if the -<a href="http://skarnet.org/software/s6/s6-envdir.html">s6-envdir</a> -command had been called before executing <em>prog</em>: the environment -is modified according to the contents of <tt>env</tt>. </li> - <li> An <tt>exec</tt> file containing <em>newprog</em> completely -bypasses the rest of s6-ipcserver-access' command line. After -environment modifications, if any, s6-ipcserver-access execs into -<tt><a href="http://skarnet.org/software/execline/execlineb.html">execlineb</a> -c <em>newprog</em></tt>. </li> -</ul> - -</body> -</html> |