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-<html>
- <head>
- <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
- <meta http-equiv="Content-Language" content="en" />
- <title>s6-networking: the accessrules library interface</title>
- <meta name="Description" content="s6-networking: the accessrules library interface" />
- <meta name="Keywords" content="s6-networking net accessrules library libs6net unix tcp access control dns ipv4 ipv6" />
- <!-- <link rel="stylesheet" type="text/css" href="http://skarnet.org/default.css" /> -->
- </head>
-<body>
-
-<p>
-<a href="index.html">libs6net</a><br />
-<a href="../">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>accessrules</tt> library interface </h1>
-
-<p>
- The following functions and structures are declared in the <tt>s6-networking/accessrules.h</tt> header,
-and implemented in the <tt>libs6net.a</tt> or <tt>libs6net.so</tt> library.
-</p>
-
-<h2> General information </h2>
-
-<p>
- <tt>s6net_accessrules</tt> is an access control library. It looks up
-a key in a user-specified database, then returns a code depending on
-whether the database allows access (in which case additional information
-can also be returned), denies access, or does not contain the key.
-</p>
-
-<p>
- <tt>accessrules</tt> has been designed to be easily extensible to any
-database format and any key format.
-</p>
-
-<p>
- Check the <tt>s6-networking/accessrules.h</tt> header for the exact definitions.
-</p>
-
-<h2> Data structures </h2>
-
-<ul>
- <li> A <tt>s6net_accessrules_result_t</tt> is a scalar that
-can have the following values: S6NET_ACCESSRULES_ERROR,
-S6NET_ACCESSRULES_DENY, S6NET_ACCESSRULES_ALLOW or S6NET_ACCESSRULES_NOTFOUND. </li>
- <li> A <tt>s6net_accessrules_params_t</tt> is a structure containing two
-<a href="http://skarnet.org/software/skalibs/libstddjb/stralloc.html">strallocs</a>,
-<em>.env</em> and <em>.exec</em>, used to return data contained in the
-database when a key has been allowed. The interpretation of this data is
-application-defined. </li>
-</ul>
-
-<h2> Function types </h2>
-
-<h3> Backend lookups </h3>
-
-<p>
- A <tt>s6net_accessrules_backend_func_t</tt> is the type of a function
-that takes a single key, looks it up in a database, and returns the result.
-Namely:
-</p>
-
-<p>
-<code>s6net_accessrules_result_t f (char const *key, unsigned int keylen, void *handle, s6net_accessrules_params_t *params) </code>
-</p>
-
-<p>
- <em>f</em> looks up key <em>key</em> of length <em>keylen</em> in the database
-represented by <em>handle</em> in an implementation-defined way. It returns a
-number that says the key has been allowed, denied or not found, or an error
-occurred. If the key has been allowed, <em>f</em> stores additional information
-from the database into *<em>params</em>.
-</p>
-
-<p>
- Two s6net_accessrules_backend_func_t functions are natively implemented:
-</p>
-
-<ul>
- <li> <tt>s6net_accessrules_backend_fs</tt> takes a <tt>char const *</tt>
-<em>handle</em> and interprets it as a base directory to look up <em>key</em>
-under, in the format understood by
-<a href="../s6-accessrules-cdb-from-fs.html">s6-accessrules-cdb-from-fs</a>. </li>
- <li> <tt>s6net_accessrules_backend_cdb</tt> takes a <tt>struct cdb *</tt>
-<em>handle</em> and looks up <em>key</em> in the
-<a href="http://cr.yp.to/cdb.html">CDB</a> it points to. <em>handle</em> must
-already be mapped to a CDB file. Such a file can be built with the
-<a href="../s6-accessrules-cdb-from-fs.html">s6-accessrules-cdb-from-fs</a>
-utility. </li>
-</ul>
-
-<h3> Frontend key checking </h3>
-
-<p>
- A <tt>s6net_accessrules_keycheck_func_t</tt> is the type of a function that
-takes a user-level key, makes a list of corresponding backend-level keys and
-calls a <tt>s6net_accessrules_backend_func_t</tt> function until it finds
-a match. Namely:
-</p>
-
-<p>
-<code>s6net_accessrules_result_t f (void const *key, void *handle, s6net_accessrules_params_t *params, s6net_accessrules_backend_func_t *backend) </code>
-</p>
-
-<p>
- <em>f</em> derives a list of low-level keys to check from <em>key</em>.
-Then, for each key <em>k</em> of length <em>klen</em> in this list, it calls
-<tt>(*backend)(k, klen, handle, params)</tt>, returning *<em>backend</em>'s result if it
-is not S6NET_ACCESSRULES_NOTFOUND. If no match can be found in the whole list,
-<em>f</em> finally returns S6NET_ACCESSRULES_NOTFOUND.
-</p>
-
-<p>
- Five s6net_accessrules_keycheck_func_t functions are natively implemented:
-</p>
-
-<ul>
- <li>
-<a name="uidgid" />
- <tt>s6net_accessrules_keycheck_uidgid</tt> interprets <em>key</em> as a
-<a href="http://skarnet.org/software/skalibs/libstddjb/">diuint</a>, i.e. a
-structure containing two unsigned ints. The first one is interpreted as an
-uid <em>u</em>, the second one as a gid <em>g</em>. The function first looks
-for a <tt>uid/<em>u</em></tt> match; if it cannot find one, it looks for a
-<tt>gid/<em>g</em></tt> match. If it cannot find one either, it checks
-<tt>uid/default</tt> and returns the result. </li>
- <li>
-<a name="reversedns" />
- <tt>s6net_accessrules_keycheck_reversedns</tt> interprets <em>key</em>
-as a string containing a FQDN. Then for each suffix <em>k</em> of <em>key</em>,
-starting with <em>key</em> itself and ending with <em>key</em>'s TLD,
-it looks up <tt>reversedns/<em>k</em></tt>. The final dot is excluded from
-<em>k</em>. If no match can be found, the function checks <tt>reversedns/@</tt>
-and returns the result. For instance, if <em>key</em> is "foo.bar.com",
-the following strings are looked up, in that order:
- <ul>
- <li> reversedns/foo.bar.com </li>
- <li> reversedns/bar.com </li>
- <li> reversedns/com </li>
- <li> reversedns/@ </li>
- </ul> </li>
- <li>
-<a name="ip4" />
- <tt>s6net_accessrules_keycheck_ip4</tt> interprets <em>key</em> as
-4 network-byte-order characters containing an IPv4 address. Then for each
-netmask <em>mask</em> from 32 to 0, it constructs the IPv4 network
-prefix <em>addr</em> corresponding to that address, and looks up
-<tt>ip4/<em>addr</em>_<em>mask</em></tt>. For instance, if <em>key</em>
-is "\300\250\001\007", representing the 192.168.1.7 address, the following
-strings are looked up, in that order:
- <ul>
- <li> ip4/192.168.1.7_32 </li>
- <li> ip4/192.168.1.6_31 </li>
- <li> ip4/192.168.1.4_30 </li>
- <li> ip4/192.168.1.0_29 </li>
- <li> ip4/192.168.0.0_28 </li>
- <li> ip4/192.168.0.0_27 </li>
- </ul>
- and so on, down to:
- <ul>
- <li> ip4/192.0.0.0_3 </li>
- <li> ip4/192.0.0.0_2 </li>
- <li> ip4/128.0.0.0_1 </li>
- <li> ip4/0.0.0.0_0 </li>
- </ul>
- Note that the <tt>ip4/0.0.0.0_0</tt> string is a catch-all key that
-matches everything. </li>
- <li>
-<a name="ip6" />
- <tt>s6net_accessrules_keycheck_ip6</tt> interprets <em>key</em> as
-16 network-byte-order characters containing an IPv6 address. Then for each
-netmask <em>mask</em> from 128 to 0, it constructs the IPv6 network
-prefix <em>addr</em> corresponding to that address,
-<strong>in canonical form</strong>,
-and looks up
-<tt>ip6/<em>addr</em>_<em>mask</em></tt>. For instance, if <em>key</em>
-is "*\0\024P@\002\b\003\0\0\0\0\0\0\020\006", representing the
-2a00:1450:4002:803::1006 address, the following
-strings are looked up, in that order:
- <ul>
- <li> ip6/2a00:1450:4002:803::1006_128 </li>
- <li> ip6/2a00:1450:4002:803::1006_127 </li>
- <li> ip6/2a00:1450:4002:803::1004_126 </li>
- <li> ip6/2a00:1450:4002:803::1000_125 </li>
- <li> ip6/2a00:1450:4002:803::1000_124 </li>
- <li> ip6/2a00:1450:4002:803::1000_123 </li>
- <li> ip6/2a00:1450:4002:803::1000_122 </li>
- <li> ip6/2a00:1450:4002:803::1000_121 </li>
- <li> ip6/2a00:1450:4002:803::1000_120 </li>
- <li> ip6/2a00:1450:4002:803::1000_119 </li>
- <li> ip6/2a00:1450:4002:803::1000_118 </li>
- <li> ip6/2a00:1450:4002:803::1000_117 </li>
- <li> ip6/2a00:1450:4002:803::1000_116 </li>
- <li> ip6/2a00:1450:4002:803::1000_115 </li>
- <li> ip6/2a00:1450:4002:803::1000_114 </li>
- <li> ip6/2a00:1450:4002:803::1000_113 </li>
- <li> ip6/2a00:1450:4002:803::_112 </li>
- <li> ip6/2a00:1450:4002:803::_111 </li>
- </ul>
- and so on, down to:
- <ul>
- <li> ip6/2a00::_11 </li>
- <li> ip6/2800::_10 </li>
- <li> ip6/2800::_9 </li>
- <li> ip6/2000::_8 </li>
- <li> ip6/2000::_7 </li>
- <li> ip6/2000::_6 </li>
- <li> ip6/2000::_5 </li>
- <li> ip6/2000::_4 </li>
- <li> ip6/2000::_3 </li>
- <li> ip6/::_2 </li>
- <li> ip6/::_1 </li>
- <li> ip6/::_0 </li>
- </ul>
- Note that the <tt>ip6/::_0</tt> string is a catch-all key that
-matches everything. </li>
- <li>
-<a name="ip46" />
- <tt>s6net_accessrules_keycheck_ip46</tt> interprets <em>key</em> as a pointer to an
-<a href="http://skarnet.org/software/skalibs/libstddjb/ip46.html">ip46_t</a>, and
-behaves either as s6net_accessrules_keycheck_ip6 or s6net_accessrules_keycheck_ip4,
-depending on the type of address *<em>key</em> contains. </li>
-</ul>
-
-<h2> Ready-to-use functions </h2>
-
- Those functions are mostly macros; they're built by associating a frontend
-function with a backend function.
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_uidgid_cdb
-(unsigned int u, unsigned int g, struct cdb *c,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the *<em>c</em> CDB database for an authorization for uid <em>u</em>
-and gid <em>g</em>. If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_uidgid_fs
-(unsigned int u, unsigned int g, char const *dir,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the <em>dir</em> base directory for an authorization for uid <em>u</em>
-and gid <em>g</em>. If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_reversedns_cdb
-(char const *name, struct cdb *c,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the *<em>c</em> CDB database for an authorization for the
-<em>name</em> FQDN. If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_reversedns_fs
-(char const *name, char const *dir,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the <em>dir</em> base directory for an authorization for the
-<em>name</em> FQDN. If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_ip4_cdb
-(char const *ip4, struct cdb *c,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the *<em>c</em> CDB database for an authorization for the
-<em>ip4</em> IPv4 address (4 network byte order characters).
-If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_ip4_fs
-(char const *ip4, char const *dir,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the <em>dir</em> base directory for an authorization for the
-<em>ip4</em> IPv4 address (4 network byte order characters).
-If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_ip6_cdb
-(char const *ip6, struct cdb *c,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the *<em>c</em> CDB database for an authorization for the
-<em>ip6</em> IPv6 address (16 network byte order characters).
-If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_ip6_fs
-(char const *ip6, char const *dir,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the <em>dir</em> base directory for an authorization for the
-<em>ip6</em> IPv6 address (16 network byte order characters).
-If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_ip46_cdb
-(ip46_t *ip, struct cdb *c,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the *<em>c</em> CDB database for an authorization for the
-<em>ip</em> IP address.
-If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-<p>
-<code> s6net_accessrules_result_t s6net_accessrules_ip46_fs
-(ip46_t const *ip, char const *dir,
-s6net_accessrules_params_t *params) </code> <br />
-Checks the <em>dir</em> base directory for an authorization for the
-<em>ip</em> IP address.
-If the result is S6NET_ACCESSRULES_ALLOW, additional
-information may be stored into <em>params</em>.
-</p>
-
-</body>
-</html>
diff --git a/doc/libs6net/index.html b/doc/libs6net/index.html
index 4fb35ff..36440ac 100644
--- a/doc/libs6net/index.html
+++ b/doc/libs6net/index.html
@@ -53,8 +53,6 @@ own header.
</p>
<ul>
- <li> The <a href="accessrules.html">s6-networking/accessrules.h</a> header
-provides function to check credentials against configuration files. </li>
<li> The <a href="ident.html">s6-networking/ident.h</a> header provides
a small IDENT client (RFC 1413). </li>
</ul>