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/*
* Copyright (c) 2009 Atheme Development Group
* Rights to this code are as documented in doc/LICENSE.
*
* LDAP authentication.
*/
/*
Supports the following options:
url -- required ldap URL (e.g. ldap://host.domain.com/)
then either:
dnformat -- basedn to authenticate against. Use %s to specify where
to insert the nick
or
base -- basedn to begin the search for the matching dn of the user
attribute -- the attribute to search against to find the nick
binddn -- distinguished name to bind to for searching (optional)
bindauth -- password for the distinguished name (optional, must specify if binddn given)
*/
#include "atheme.h"
#include <ldap.h>
DECLARE_MODULE_V1("auth/ldap", false, _modinit, _moddeinit, PACKAGE_STRING, VENDOR_STRING);
mowgli_list_t conf_ldap_table;
struct
{
char *url;
char *dnformat;
char *attribute;
char *base;
char *binddn;
char *bindauth;
bool useDN;
} ldap_config;
LDAP *ldap_conn;
static void ldap_config_ready(void *unused)
{
int res;
char *p;
static time_t lastwarning;
if (ldap_conn != NULL)
ldap_unbind_ext_s(ldap_conn, NULL, NULL);
ldap_conn = NULL;
if (ldap_config.url == NULL)
{
slog(LG_ERROR, "ldap_config_ready(): ldap {} missing url definition");
return;
}
if ((ldap_config.dnformat == NULL) && ((ldap_config.base == NULL) || (ldap_config.attribute == NULL)))
{
slog(LG_ERROR, "ldap_config_ready(): ldap {} block requires dnformat or base & attribute definition");
return;
}
if (ldap_config.binddn != NULL && ldap_config.bindauth == NULL)
{
slog(LG_ERROR, "ldap_config_ready(): ldap{} block requires bindauth to be defined if binddn is defined");
return;
}
if (ldap_config.dnformat != NULL)
{
ldap_config.useDN = true;
p = strchr(ldap_config.dnformat, '%');
if (p == NULL || p[1] != 's' || strchr(p + 1, '%'))
{
slog(LG_ERROR, "ldap_config_ready(): dnformat must contain exactly one %%s and no other %%");
return;
}
}
else
ldap_config.useDN = false;
ldap_set_option(NULL, LDAP_OPT_PROTOCOL_VERSION, &(const int)
{
3});
res = ldap_initialize(&ldap_conn, ldap_config.url);
if (res != LDAP_SUCCESS)
{
slog(LG_ERROR, "ldap_config_ready(): ldap_initialize(%s) failed: %s", ldap_config.url, ldap_err2string(res));
if (CURRTIME > lastwarning + 300)
{
slog(LG_INFO, "LDAP:ERROR: \2%s\2", ldap_err2string(res));
wallops("Problem with LDAP server: %s", ldap_err2string(res));
lastwarning = CURRTIME;
}
return;
}
/* short timeouts, because this blocks atheme as a whole */
ldap_set_option(ldap_conn, LDAP_OPT_TIMEOUT, &(const struct timeval){1, 0});
ldap_set_option(ldap_conn, LDAP_OPT_NETWORK_TIMEOUT, &(const struct timeval){1, 0});
ldap_set_option(ldap_conn, LDAP_OPT_DEREF, &(const int){false});
ldap_set_option(ldap_conn, LDAP_OPT_REFERRALS, &(const int){false});
}
static bool ldap_auth_user(myuser_t *mu, const char *password)
{
int res;
struct berval cred;
LDAPMessage *message, *entry;
if (ldap_conn == NULL)
{
ldap_config_ready(NULL);
}
if (ldap_conn == NULL)
{
slog(LG_INFO, "ldap_auth_user(): no connection");
return false;
}
if (strchr(entity(mu)->name, ' '))
{
slog(LG_INFO, "ldap_auth_user(%s): bad name: found space", entity(mu)->name);
return false;
}
if (strchr(entity(mu)->name, ','))
{
slog(LG_INFO, "ldap_auth_user(%s): bad name: found comma", entity(mu)->name);
return false;
}
if (strchr(entity(mu)->name, '/'))
{
slog(LG_INFO, "ldap_auth_user(%s): bad name: found /", entity(mu)->name);
return false;
}
/* Use DN to find exact match */
if (ldap_config.useDN)
{
char dn[512];
cred.bv_len = strlen(password);
/* sstrdup it to remove the const */
cred.bv_val = sstrdup(password);
snprintf(dn, sizeof dn, ldap_config.dnformat, entity(mu)->name);
res = ldap_sasl_bind_s(ldap_conn, dn, LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
if (res == LDAP_SERVER_DOWN)
{
ldap_config_ready(NULL);
res = ldap_sasl_bind_s(ldap_conn, dn, LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
}
if (res == LDAP_SUCCESS)
return true;
else if (res == LDAP_INVALID_CREDENTIALS)
{
slog(LG_INFO, "ldap_auth_user(%s): ldap auth bind failed: %s", entity(mu)->name, ldap_err2string(res));
return false;
}
slog(LG_INFO, "ldap_auth_user(): ldap_bind_s failed: %s", ldap_err2string(res));
return false;
/* Use base + attribute search for Auth */
}
else
{
char what[512];
char *binddn = NULL;
cred.bv_len = 0;
if (ldap_config.binddn != NULL && ldap_config.bindauth != NULL)
{
binddn = ldap_config.binddn;
cred.bv_val = ldap_config.bindauth;
cred.bv_len = strlen(ldap_config.bindauth);
}
res = ldap_sasl_bind_s(ldap_conn, binddn, LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
if (res == LDAP_SERVER_DOWN)
{
ldap_config_ready(NULL);
res = ldap_sasl_bind_s(ldap_conn, binddn, LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
}
if (res != LDAP_SUCCESS)
{
slog(LG_INFO, "ldap_auth_user(): ldap_bind_s failed: %s", ldap_err2string(res));
return false;
}
sprintf(what, "%s=%s", ldap_config.attribute, entity(mu)->name);
if ((res = ldap_search_ext_s(ldap_conn, ldap_config.base, LDAP_SCOPE_SUBTREE, what, NULL, 0, NULL, NULL, NULL, 0, &message)) != LDAP_SUCCESS)
{
slog(LG_INFO, "ldap_auth_user(%s): ldap search failed: %s", entity(mu)->name, ldap_err2string(res));
return false;
}
cred.bv_len = strlen(password);
/* sstrdup it to remove the const */
cred.bv_val = sstrdup(password);
for (entry = ldap_first_message(ldap_conn, message); entry && ldap_msgtype(entry) == LDAP_RES_SEARCH_ENTRY; entry = ldap_next_message(ldap_conn, entry))
{
res = ldap_sasl_bind_s(ldap_conn, ldap_get_dn(ldap_conn, entry), LDAP_SASL_SIMPLE, &cred, NULL, NULL, NULL);
if (res == LDAP_SUCCESS)
{
ldap_msgfree(message);
return true;
}
}
ldap_msgfree(message);
}
slog(LG_INFO, "ldap_auth_user(%s): ldap auth bind failed: %s", entity(mu)->name, ldap_err2string(res));
return false;
}
void _modinit(module_t * m)
{
hook_add_event("config_ready");
hook_add_config_ready(ldap_config_ready);
add_subblock_top_conf("LDAP", &conf_ldap_table);
add_dupstr_conf_item("URL", &conf_ldap_table, 0, &ldap_config.url, NULL);
add_dupstr_conf_item("DNFORMAT", &conf_ldap_table, 0, &ldap_config.dnformat, NULL);
add_dupstr_conf_item("BASE", &conf_ldap_table, 0, &ldap_config.base, NULL);
add_dupstr_conf_item("ATTRIBUTE", &conf_ldap_table, 0, &ldap_config.attribute, NULL);
add_dupstr_conf_item("BINDDN", &conf_ldap_table, 0, &ldap_config.binddn, NULL);
add_dupstr_conf_item("BINDAUTH", &conf_ldap_table, 0, &ldap_config.bindauth, NULL);
auth_user_custom = &ldap_auth_user;
auth_module_loaded = true;
}
void _moddeinit(module_unload_intent_t intent)
{
auth_user_custom = NULL;
auth_module_loaded = false;
if (ldap_conn != NULL)
ldap_unbind_ext_s(ldap_conn, NULL, NULL);
hook_del_config_ready(ldap_config_ready);
del_conf_item("URL", &conf_ldap_table);
del_conf_item("DNFORMAT", &conf_ldap_table);
del_conf_item("BASE", &conf_ldap_table);
del_conf_item("ATTRIBUTE", &conf_ldap_table);
del_conf_item("BINDDN", &conf_ldap_table);
del_conf_item("BINDAUTH", &conf_ldap_table);
del_top_conf("LDAP");
}
/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
* vim:ts=8
* vim:sw=8
* vim:noexpandtab
*/
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