/
dlz_ldap_enum_driver.c
1419 lines (1253 loc) · 37.3 KB
/
dlz_ldap_enum_driver.c
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/*
* Copyright (C) 2002 Stichting NLnet, Netherlands, stichting@nlnet.nl.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the
* above copyright notice and this permission notice appear in all
* copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND STICHTING NLNET
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* STICHTING NLNET BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
* USE OR PERFORMANCE OF THIS SOFTWARE.
*
* The development of Dynamically Loadable Zones (DLZ) for BIND 9 was
* conceived and contributed by Rob Butler.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the
* above copyright notice and this permission notice appear in all
* copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND ROB BUTLER
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* ROB BUTLER BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
* OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE
* USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Copyright (C) 1999-2001 Internet Software Consortium.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
* DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
* INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
* INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
* FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
* NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
* WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <config.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <dns/log.h>
#include <dns/sdlz.h>
#include <dns/result.h>
#include <isc/mem.h>
#include <isc/platform.h>
#include <isc/print.h>
#include <isc/result.h>
#include <isc/string.h>
#include <isc/util.h>
//#include <named/globals.h>
//#include <dlz/sdlz_helper.h>
#include "sdlz_helper.h"
#include "dlz_ldap_enum_driver.h"
/*
* Need older API functions from ldap.h.
*/
#define LDAP_DEPRECATED 1
#include <ldap.h>
#define SIMPLE "simple"
#define KRB41 "krb41"
#define KRB42 "krb42"
#define V2 "v2"
#define V3 "v3"
//static dns_sdlzimplementation_t *dlz_ldap = NULL;
#define dbc_search_limit 30
#define ALLNODES 1
#define ALLOWXFR 2
#define AUTHORITY 3
#define FINDZONE 4
#define LOOKUP 5
/*%
* Structure to hold everthing needed by this "instance" of the LDAP
* driver remember, the driver code is only loaded once, but may have
* many separate instances.
*/
typedef struct {
#ifdef ISC_PLATFORM_USETHREADS
db_list_t *db; /*%< handle to a list of DB */
#else
dbinstance_t *db; /*%< handle to db */
#endif
int method; /*%< security authentication method */
char *user; /*%< who is authenticating */
char *cred; /*%< password for simple authentication method */
int protocol; /*%< LDAP communication protocol version */
char *hosts; /*%< LDAP server hosts */
char *enum_suffix;
char *soa;
char *ns;
int default_ttl;
} ldap_instance_t;
#ifdef BIND_9_9
isc_mem_t *ns_g_mctx = NULL;
#endif
/*
* Private methods
*/
/*% checks that the LDAP URL parameters make sense */
static isc_result_t
dlz_ldap_checkURL(char *URL, int attrCnt, const char *msg) {
isc_result_t result = ISC_R_SUCCESS;
int ldap_result;
LDAPURLDesc *ldap_url = NULL;
if (!ldap_is_ldap_url(URL)) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"%s query is not a valid LDAP URL", msg);
result = ISC_R_FAILURE;
goto cleanup;
}
ldap_result = ldap_url_parse(URL, &ldap_url);
if (ldap_result != LDAP_SUCCESS || ldap_url == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"parsing %s query failed", msg);
result = ISC_R_FAILURE;
goto cleanup;
}
if (ldap_count_values(ldap_url->lud_attrs) < attrCnt) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"%s query must specify at least "
"%d attributes to return",
msg, attrCnt);
result = ISC_R_FAILURE;
goto cleanup;
}
if (ldap_url->lud_host != NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"%s query must not specify a host", msg);
result = ISC_R_FAILURE;
goto cleanup;
}
if (ldap_url->lud_port != 389) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"%s query must not specify a port", msg);
result = ISC_R_FAILURE;
goto cleanup;
}
if (ldap_url->lud_dn == NULL || strlen (ldap_url->lud_dn) < 1) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"%s query must specify a search base", msg);
result = ISC_R_FAILURE;
goto cleanup;
}
if (ldap_url->lud_exts != NULL || ldap_url->lud_crit_exts != 0) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"%s uses extensions. "
"The driver does not support LDAP extensions.",
msg);
result = ISC_R_FAILURE;
goto cleanup;
}
cleanup:
if (ldap_url != NULL)
ldap_free_urldesc(ldap_url);
return (result);
}
/*% Connects / reconnects to LDAP server */
static isc_result_t
dlz_ldap_connect(ldap_instance_t *dbi, dbinstance_t *dbc) {
isc_result_t result;
int ldap_result;
/* if we have a connection, get ride of it. */
if (dbc->dbconn != NULL) {
ldap_unbind_s((LDAP *) dbc->dbconn);
dbc->dbconn = NULL;
}
/* now connect / reconnect. */
/* initialize. */
dbc->dbconn = ldap_init(dbi->hosts, LDAP_PORT);
if (dbc->dbconn == NULL)
return (ISC_R_NOMEMORY);
/* set protocol version. */
ldap_result = ldap_set_option((LDAP *) dbc->dbconn,
LDAP_OPT_PROTOCOL_VERSION,
&(dbi->protocol));
if (ldap_result != LDAP_SUCCESS) {
result = ISC_R_NOPERM;
goto cleanup;
}
/* "bind" to server. i.e. send username / pass */
ldap_result = ldap_bind_s((LDAP *) dbc->dbconn, dbi->user,
dbi->cred, dbi->method);
if (ldap_result != LDAP_SUCCESS) {
result = ISC_R_FAILURE;
goto cleanup;
}
return (ISC_R_SUCCESS);
cleanup:
/* cleanup if failure. */
if (dbc->dbconn != NULL) {
ldap_unbind_s((LDAP *) dbc->dbconn);
dbc->dbconn = NULL;
}
return (result);
}
#ifdef ISC_PLATFORM_USETHREADS
/*%
* Properly cleans up a list of database instances.
* This function is only used when the driver is compiled for
* multithreaded operation.
*/
static void
ldap_destroy_dblist(db_list_t *dblist) {
dbinstance_t *ndbi = NULL;
dbinstance_t *dbi = NULL;
/* get the first DBI in the list */
ndbi = ISC_LIST_HEAD(*dblist);
/* loop through the list */
while (ndbi != NULL) {
dbi = ndbi;
/* get the next DBI in the list */
ndbi = ISC_LIST_NEXT(dbi, link);
/* release DB connection */
if (dbi->dbconn != NULL)
ldap_unbind_s((LDAP *) dbi->dbconn);
/* release all memory that comprised a DBI */
destroy_sqldbinstance(dbi);
}
/* release memory for the list structure */
isc_mem_put(ns_g_mctx, dblist, sizeof(db_list_t));
}
/*%
* Loops through the list of DB instances, attempting to lock
* on the mutex. If successful, the DBI is reserved for use
* and the thread can perform queries against the database.
* If the lock fails, the next one in the list is tried.
* looping continues until a lock is obtained, or until
* the list has been searched dbc_search_limit times.
* This function is only used when the driver is compiled for
* multithreaded operation.
*/
static dbinstance_t *
ldap_find_avail_conn(db_list_t *dblist) {
dbinstance_t *dbi = NULL;
dbinstance_t *head;
int count = 0;
/* get top of list */
head = dbi = ISC_LIST_HEAD(*dblist);
/* loop through list */
while (count < dbc_search_limit) {
/* try to lock on the mutex */
if (isc_mutex_trylock(&dbi->instance_lock) == ISC_R_SUCCESS)
return (dbi); /* success, return the DBI for use. */
/* not successful, keep trying */
dbi = ISC_LIST_NEXT(dbi, link);
/* check to see if we have gone to the top of the list. */
if (dbi == NULL) {
count++;
dbi = head;
}
}
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_INFO,
"LDAP driver unable to find available connection "
"after searching %d times",
count);
return (NULL);
}
#endif /* ISC_PLATFORM_USETHREADS */
static isc_result_t
mail_to_naptr(const char *tel, const char *mail, int ttl,
const char *scheme, char **naptr)
{
int len;
char naptr_buf[NAPTR_BUFSIZE + 1];
char *_naptr;
*naptr = NULL;
len = snprintf(naptr_buf, NAPTR_BUFSIZE, NAPTR_TEMPLATE,
scheme, tel, scheme, mail);
if(len >= NAPTR_BUFSIZE)
return ISC_R_FAILURE;
_naptr = isc_mem_strdup(ns_g_mctx, naptr_buf);
if (_naptr == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"LDAP driver unable to allocate memory "
"while processing results");
return ISC_R_FAILURE;
}
*naptr = _naptr;
return ISC_R_SUCCESS;
}
static isc_result_t
ldap_process_results(LDAP *dbc, LDAPMessage *msg, char ** attrs,
void *ptr, isc_boolean_t allnodes, char *tel,
void *dbdata)
{
isc_result_t result = ISC_R_SUCCESS;
int i = 0;
int j;
int len;
char *attribute = NULL;
LDAPMessage *entry;
char *endp = NULL;
char *host = NULL;
char *type = TYPE_NAPTR;
char *data = NULL;
char **vals = NULL;
char *schemes[] = { "sip", "xmpp", NULL };
int ttl = ((ldap_instance_t *)dbdata)->default_ttl;
/* make sure there are at least some attributes to process. */
REQUIRE(attrs != NULL || attrs[0] != NULL);
/* get the first entry to process */
entry = ldap_first_entry(dbc, msg);
if (entry == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_INFO,
"LDAP no entries to process.");
return (ISC_R_FAILURE);
}
/* loop through all entries returned */
while (entry != NULL) {
/* get the list of values for this attribute. */
vals = ldap_get_values(dbc, entry, attrs[0]);
/* skip empty attributes. */
if (vals == NULL || ldap_count_values(vals) < 1)
continue;
/*
* we only use the first value. this driver
* does not support multi-valued attributes.
*/
for(j = 0; schemes[j] != NULL; j++)
{
mail_to_naptr(tel, vals[0], ttl, schemes[j], &data);
// now store the naptr:
if (data == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"LDAP driver unable to allocate memory "
"while processing results");
result = ISC_R_FAILURE;
goto cleanup;
}
result = dns_sdlz_putrr((dns_sdlzlookup_t *) ptr,
type, ttl, data);
if (result != ISC_R_SUCCESS)
{
isc_log_write(dns_lctx,
DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"dlz-ldap: putrr failed "
"for \"%s %u %s\", %s",
type, ttl, data,
isc_result_totext(result));
goto cleanup;
}
isc_mem_free(ns_g_mctx, data);
data = NULL;
}
/* free vals for next loop */
ldap_value_free(vals);
vals = NULL;
/* get the next entry to process */
entry = ldap_next_entry(dbc, entry);
} /* end while (entry != NULL) */
cleanup:
/* de-allocate memory */
if (vals != NULL)
ldap_value_free(vals);
if (data != NULL)
isc_mem_free(ns_g_mctx, data);
return (result);
}
static isc_result_t
dnsname_strip_suffix(void *dbdata, char *name)
{
char *_suffix = ((ldap_instance_t *)dbdata)->enum_suffix;
int d;
d = strlen(name) - strlen(_suffix);
if(d > 1)
{
if(name[d-1] != '.')
return ISC_R_FAILURE;
name[d-1] = 0;
}
else if(d == 1)
{
return ISC_R_FAILURE;
}
else
name[0] = 0;
return ISC_R_SUCCESS;
}
static isc_result_t
dnsname_e164(void *dbdata, const char *name, char **e164num)
{
char *_e164num = NULL;
int d, i, x;
*e164num = NULL;
isc_log_write(dns_lctx,
DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(1),
"dlz-ldap: trying to convert to E.164: %s", name);
d = strlen(name);
if(d % 2 != 1)
{
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"Unexpected length of string");
return ISC_R_FAILURE;
}
d = (d / 2) + 1;
if(d < MIN_NUM_LENGTH || d > MAX_NUM_LENGTH)
{
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"Number too short or too long for E.164");
return ISC_R_FAILURE;
}
// Allocate memory, add space for leading + and trailing 0
_e164num = isc_mem_allocate(ns_g_mctx, d + 2);
if(_e164num == NULL)
{
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"LDAP driver unable to allocate memory "
"while converting to E.164");
return ISC_R_FAILURE;
}
_e164num[0] = '+';
for(i = 1; i <= d; i++)
{
x = (d-i) * 2;
if(!isdigit(name[x]) || (i > 1 && name[x + 1] != '.'))
{
isc_mem_free(ns_g_mctx, _e164num);
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"unexpected character in ENUM query string");
return ISC_R_FAILURE;
}
_e164num[i] = name[x];
}
_e164num[d + 1] = 0;
*e164num = _e164num;
return ISC_R_SUCCESS;
}
static isc_result_t
handle_authority_static(void *dbdata, void *ptr, int withNS)
{
char *type;
char *data;
char *host;
int ttl;
isc_result_t result;
type = isc_mem_strdup(ns_g_mctx, TYPE_SOA);
data = isc_mem_strdup(ns_g_mctx, ((ldap_instance_t *)dbdata)->soa);
host = isc_mem_strdup(ns_g_mctx, ((ldap_instance_t *)dbdata)->enum_suffix);
ttl = ((ldap_instance_t *)dbdata)->default_ttl;
result = dns_sdlz_putrr((dns_sdlzlookup_t *) ptr,
type, ttl, data);
if (result != ISC_R_SUCCESS)
isc_log_write(dns_lctx,
DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"dlz-ldap: putrr failed "
"for \"%s %u %s\", %s",
type, ttl, data,
isc_result_totext(result));
isc_mem_free(ns_g_mctx, type);
isc_mem_free(ns_g_mctx, data);
if(withNS > 0)
{
type = isc_mem_strdup(ns_g_mctx, TYPE_NS);
data = isc_mem_strdup(ns_g_mctx, ((ldap_instance_t *)dbdata)->ns);
result = dns_sdlz_putrr((dns_sdlzlookup_t *) ptr,
type, ttl, data);
if (result != ISC_R_SUCCESS)
isc_log_write(dns_lctx,
DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"dlz-ldap: putrr failed "
"for \"%s %u %s\", %s",
type, ttl, data,
isc_result_totext(result));
isc_mem_free(ns_g_mctx, type);
isc_mem_free(ns_g_mctx, data);
}
isc_mem_free(ns_g_mctx, host);
return result;
}
/*%
* This function is the real core of the driver. Zone, record
* and client strings are passed in (or NULL is passed if the
* string is not available). The type of query we want to run
* is indicated by the query flag, and the dbdata object is passed
* passed in to. dbdata really holds either:
* 1) a list of database instances (in multithreaded mode) OR
* 2) a single database instance (in single threaded mode)
* The function will construct the query and obtain an available
* database instance (DBI). It will then run the query and hopefully
* obtain a result set.
*/
static isc_result_t
ldap_get_results(const char *zone, const char *record,
const char *client, unsigned int query,
void *dbdata, void *ptr)
{
isc_result_t result;
dbinstance_t *dbi = NULL;
char *querystring = NULL;
LDAPURLDesc *ldap_url = NULL;
int ldap_result = 0;
LDAPMessage *ldap_msg = NULL;
int i;
int entries;
char *_record;
char *tel = NULL;
/* get db instance / connection */
#ifdef ISC_PLATFORM_USETHREADS
/* find an available DBI from the list */
dbi = ldap_find_avail_conn((db_list_t *)
((ldap_instance_t *)dbdata)->db);
#else /* ISC_PLATFORM_USETHREADS */
/*
* only 1 DBI - no need to lock instance lock either
* only 1 thread in the whole process, no possible contention.
*/
dbi = (dbinstance_t *) ((ldap_instance_t *)dbdata)->db;
#endif /* ISC_PLATFORM_USETHREADS */
/* if DBI is null, can't do anything else */
if (dbi == NULL)
return (ISC_R_FAILURE);
/* set fields */
if (zone != NULL) {
dbi->zone = isc_mem_strdup(ns_g_mctx, zone);
if (dbi->zone == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
} else {
dbi->zone = NULL;
}
if (record != NULL) {
if(strlen(record) != 1)
{
result = dnsname_e164(dbdata, record, &(dbi->record));
if(result != ISC_R_SUCCESS)
goto cleanup;
tel = dbi->record;
} else {
if(record[0] == '@')
{
if(zone == NULL)
{
result = ISC_R_FAILURE;
goto cleanup;
}
_record = isc_mem_strdup(ns_g_mctx, zone);
result = dnsname_strip_suffix(dbdata, _record);
if(result != ISC_R_SUCCESS)
{
isc_mem_free(ns_g_mctx, _record);
goto cleanup;
}
result = dnsname_e164(dbdata, _record, &(dbi->record));
isc_mem_free(ns_g_mctx, _record);
if(result != ISC_R_SUCCESS)
goto cleanup;
tel = dbi->record;
} else {
dbi->record = isc_mem_strdup(ns_g_mctx, record);
if (dbi->record == NULL)
{
result = ISC_R_NOMEMORY;
goto cleanup;
}
}
}
} else {
dbi->record = NULL;
}
if (client != NULL) {
dbi->client = isc_mem_strdup(ns_g_mctx, client);
if (dbi->client == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
} else {
dbi->client = NULL;
}
/* what type of query are we going to run? */
switch(query) {
case ALLNODES:
/*
* if the query was not passed in from the config file
* then we can't run it. return not_implemented, so
* it's like the code for that operation was never
* built into the driver.... AHHH flexibility!!!
*/
if (dbi->allnodes_q == NULL) {
result = ISC_R_NOTIMPLEMENTED;
goto cleanup;
} else {
querystring = build_querystring(ns_g_mctx,
dbi->allnodes_q);
}
break;
case ALLOWXFR:
/* same as comments as ALLNODES */
if (dbi->allowxfr_q == NULL) {
result = ISC_R_NOTIMPLEMENTED;
goto cleanup;
} else {
querystring = build_querystring(ns_g_mctx,
dbi->allowxfr_q);
}
break;
case AUTHORITY:
result = handle_authority_static(dbdata, ptr, 0);
goto cleanup;
/* same as comments as ALLNODES */
if (dbi->authority_q == NULL) {
result = ISC_R_NOTIMPLEMENTED;
goto cleanup;
} else {
querystring = build_querystring(ns_g_mctx,
dbi->authority_q);
}
break;
case FINDZONE:
/* this is required. It's the whole point of DLZ! */
if (dbi->findzone_q == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
"No query specified for findzone. "
"Findzone requires a query");
result = ISC_R_FAILURE;
goto cleanup;
} else {
querystring = build_querystring(ns_g_mctx,
dbi->findzone_q);
}
break;
case LOOKUP:
/* this is required. It's also a major point of DLZ! */
if (dbi->lookup_q == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(2),
"No query specified for lookup. "
"Lookup requires a query");
result = ISC_R_FAILURE;
goto cleanup;
} else {
querystring = build_querystring(ns_g_mctx,
dbi->lookup_q);
}
break;
default:
/*
* this should never happen. If it does, the code is
* screwed up!
*/
UNEXPECTED_ERROR(__FILE__, __LINE__,
"Incorrect query flag passed to "
"ldap_get_results");
result = ISC_R_UNEXPECTED;
goto cleanup;
}
/* if the querystring is null, Bummer, outta RAM. UPGRADE TIME!!! */
if (querystring == NULL) {
result = ISC_R_NOMEMORY;
goto cleanup;
}
/*
* output the full query string during debug so we can see
* what lame error the query has.
*/
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(1),
"\nQuery String: %s\n", querystring);
/* break URL down into it's component parts, if error cleanup */
ldap_result = ldap_url_parse(querystring, &ldap_url);
if (ldap_result != LDAP_SUCCESS || ldap_url == NULL) {
result = ISC_R_FAILURE;
goto cleanup;
}
for (i = 0; i < 3; i++) {
/*
* dbi->dbconn may be null if trying to reconnect on a
* previous query failed.
*/
if (dbi->dbconn == NULL) {
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_INFO,
"LDAP driver attempting to re-connect");
result = dlz_ldap_connect((ldap_instance_t *) dbdata,
dbi);
if (result != ISC_R_SUCCESS) {
result = ISC_R_FAILURE;
continue;
}
}
/* perform ldap search syncronously */
ldap_result = ldap_search_s((LDAP *) dbi->dbconn,
ldap_url->lud_dn,
ldap_url->lud_scope,
ldap_url->lud_filter,
ldap_url->lud_attrs, 0, &ldap_msg);
/*
* check return code. No such object is ok, just
* didn't find what we wanted
*/
switch(ldap_result) {
case LDAP_NO_SUCH_OBJECT:
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(1),
"No object found matching "
"query requirements");
result = ISC_R_NOTFOUND;
goto cleanup;
break;
case LDAP_SUCCESS: /* on success do nothing */
result = ISC_R_SUCCESS;
i = 3;
break;
case LDAP_SERVER_DOWN:
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_INFO,
"LDAP driver attempting to re-connect");
result = dlz_ldap_connect((ldap_instance_t *) dbdata,
dbi);
if (result != ISC_R_SUCCESS)
result = ISC_R_FAILURE;
break;
default:
/*
* other errors not ok. Log error message and
* get out
*/
isc_log_write(dns_lctx, DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_ERROR,
"LDAP error: %s",
ldap_err2string(ldap_result));
result = ISC_R_FAILURE;
goto cleanup;
break;
} /* close switch(ldap_result) */
} /* end for (int i = 0 i < 3; i++) */
if (result != ISC_R_SUCCESS)
goto cleanup;
switch(query) {
case ALLNODES:
result = ldap_process_results((LDAP *) dbi->dbconn, ldap_msg,
ldap_url->lud_attrs,
ptr, isc_boolean_true, NULL,
dbdata);
break;
case AUTHORITY:
case LOOKUP:
result = ldap_process_results((LDAP *) dbi->dbconn, ldap_msg,
ldap_url->lud_attrs,
ptr, isc_boolean_false, tel,
dbdata);
break;
case ALLOWXFR:
entries = ldap_count_entries((LDAP *) dbi->dbconn, ldap_msg);
if (entries == 0)
result = ISC_R_NOPERM;
else if (entries > 0)
result = ISC_R_SUCCESS;
else
result = ISC_R_FAILURE;
break;
case FINDZONE:
entries = ldap_count_entries((LDAP *) dbi->dbconn, ldap_msg);
if (entries == 0)
result = ISC_R_NOTFOUND;
else if (entries > 0)
result = ISC_R_SUCCESS;
else
result = ISC_R_FAILURE;
break;
default:
/*
* this should never happen. If it does, the code is
* screwed up!
*/
UNEXPECTED_ERROR(__FILE__, __LINE__,
"Incorrect query flag passed to "
"ldap_get_results");
result = ISC_R_UNEXPECTED;
}
cleanup:
/* it's always good to cleanup after yourself */
/* if we retrieved results, free them */
if (ldap_msg != NULL)
ldap_msgfree(ldap_msg);
if (ldap_url != NULL)
ldap_free_urldesc(ldap_url);
/* cleanup */
if (dbi->zone != NULL)
isc_mem_free(ns_g_mctx, dbi->zone);
if (dbi->record != NULL)
isc_mem_free(ns_g_mctx, dbi->record);
if (dbi->client != NULL)
isc_mem_free(ns_g_mctx, dbi->client);
#ifdef ISC_PLATFORM_USETHREADS
/* release the lock so another thread can use this dbi */
isc_mutex_unlock(&dbi->instance_lock);
#endif /* ISC_PLATFORM_USETHREADS */
/* release query string */
if (querystring != NULL)
isc_mem_free(ns_g_mctx, querystring );
/* return result */
return (result);
}
/*
* dlz_dlopen methods
*/
int
dlz_version(unsigned int *flags)
{
return DLZ_DLOPEN_VERSION;
}
isc_result_t
dlz_allowzonexfr(void *dbdata, const char *name,
const char *client)
{
isc_result_t result;
/* check to see if we are authoritative for the zone first */
result = dlz_findzonedb(dbdata, name);
if (result != ISC_R_SUCCESS) {
return (result);
}
/* get all the zone data */
result = ldap_get_results(name, NULL, client, ALLOWXFR, dbdata, NULL);
return (result);
}
isc_result_t
dlz_allnodes(const char *zone, void *dbdata,
dns_sdlzallnodes_t *allnodes)
{
return (ldap_get_results(zone, NULL, NULL, ALLNODES, dbdata, allnodes));
}
isc_result_t
dlz_authority(const char *zone, void *dbdata,
dns_sdlzlookup_t *lookup)
{
return (ldap_get_results(zone, NULL, NULL, AUTHORITY, dbdata, lookup));
}
isc_result_t
dlz_findzonedb(void *dbdata, const char *name) {
char *_suffix = ((ldap_instance_t *)dbdata)->enum_suffix;
const char *_name = name;
int d;
isc_log_write(dns_lctx,
DNS_LOGCATEGORY_DATABASE,
DNS_LOGMODULE_DLZ, ISC_LOG_DEBUG(1),
"findzonedb: %s", name);
d = strlen(name) - strlen(_suffix);
if(d > 1)
{
if(name[d-1] != '.')
return ISC_R_FAILURE;
_name += d;
}
else if(d == 1 || d < 0)
{
return ISC_R_FAILURE;
}
if(strcasecmp(_suffix, _name) == 0)
return ISC_R_SUCCESS;