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<div class="section" id="configuration-interface-profile">
<span id="profile-plugin"></span><h1>Configuration interface (profile)<a class="headerlink" href="#configuration-interface-profile" title="Permalink to this headline">¶</a></h1>
<p>The profile interface allows a module to control how krb5
configuration information is obtained by the Kerberos library and
applications. For a detailed description of the profile interface,
see the header file <tt class="docutils literal"><span class="pre"><profile.h></span></tt>.</p>
<div class="admonition note">
<p class="first admonition-title">Note</p>
<p class="last">The profile interface does not follow the normal conventions
for MIT krb5 pluggable interfaces, because it is part of a
lower-level component of the krb5 library.</p>
</div>
<p>As with other types of plugin modules, a profile module is a Unix
shared object or Windows DLL, built separately from the krb5 tree.
The krb5 library will dynamically load and use a profile plugin module
if it reads a <tt class="docutils literal"><span class="pre">module</span></tt> directive at the beginning of krb5.conf, as
described in <a class="reference internal" href="../admin/host_config.html#profile-plugin-config"><em>Configuration profile modules</em></a>.</p>
<p>A profile module exports a function named <tt class="docutils literal"><span class="pre">profile_module_init</span></tt>
matching the signature of the profile_module_init_fn type. This
function accepts a residual string, which may be used to help locate
the configuration source. The function fills in a vtable and may also
create a per-profile state object. If the module uses state objects,
it should implement the <strong>copy</strong> and <strong>cleanup</strong> methods to manage
them.</p>
<p>A basic read-only profile module need only implement the
<strong>get_values</strong> and <strong>free_values</strong> methods. The <strong>get_values</strong> method
accepts a null-terminated list of C string names (e.g., an array
containing “libdefaults”, “clockskew”, and NULL for the <strong>clockskew</strong>
variable in the <a class="reference internal" href="../admin/conf_files/krb5_conf.html#libdefaults"><em>[libdefaults]</em></a> section) and returns a
null-terminated list of values, which will be cleaned up with the
<strong>free_values</strong> method when the caller is done with them.</p>
<p>Iterable profile modules must also define the <strong>iterator_create</strong>,
<strong>iterator</strong>, <strong>iterator_free</strong>, and <strong>free_string</strong> methods. The
core krb5 code does not require profiles to be iterable, but some
applications may iterate over the krb5 profile object in order to
present configuration interfaces.</p>
<p>Writable profile modules must also define the <strong>writable</strong>,
<strong>modified</strong>, <strong>update_relation</strong>, <strong>rename_section</strong>,
<strong>add_relation</strong>, and <strong>flush</strong> methods. The core krb5 code does not
require profiles to be writable, but some applications may write to
the krb5 profile in order to present configuration interfaces.</p>
<p>The following is an example of a very basic read-only profile module
which returns a hardcoded value for the <strong>default_realm</strong> variable in
<a class="reference internal" href="../admin/conf_files/krb5_conf.html#libdefaults"><em>[libdefaults]</em></a>, and provides no other configuration information.
(For conciseness, the example omits code for checking the return
values of malloc and strdup.)</p>
<div class="highlight-python"><div class="highlight"><pre>#include <stdlib.h>
#include <string.h>
#include <profile.h>
static long
get_values(void *cbdata, const char *const *names, char ***values)
{
if (names[0] != NULL && strcmp(names[0], "libdefaults") == 0 &&
names[1] != NULL && strcmp(names[1], "default_realm") == 0) {
*values = malloc(2 * sizeof(char *));
(*values)[0] = strdup("ATHENA.MIT.EDU");
(*values)[1] = NULL;
return 0;
}
return PROF_NO_RELATION;
}
static void
free_values(void *cbdata, char **values)
{
char **v;
for (v = values; *v; v++)
free(*v);
free(values);
}
long
profile_module_init(const char *residual, struct profile_vtable *vtable,
void **cb_ret);
long
profile_module_init(const char *residual, struct profile_vtable *vtable,
void **cb_ret)
{
*cb_ret = NULL;
vtable->get_values = get_values;
vtable->free_values = free_values;
return 0;
}
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