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#ident "$Id$"
/*
* lookup_ldap.c
*
* Module for Linux automountd to access automount maps in LDAP directories.
*
*/
#include <sys/types.h>
#include <ctype.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <stdlib.h>
#include <netinet/in.h>
#include <arpa/nameser.h>
#include <resolv.h>
#include <lber.h>
#include <ldap.h>
#define MODULE_LOOKUP
#include "automount.h"
#define MAPFMT_DEFAULT "sun"
#define MODPREFIX "lookup(ldap): "
#define OBJECTCLASS "automount"
#define ATTRIBUTE "automountInformation"
#define WILDCARD "/"
struct lookup_context {
char *server, *base;
struct parse_mod *parser;
};
int lookup_version = AUTOFS_LOOKUP_VERSION; /* Required by protocol */
/*
* This initializes a context (persistent non-global data) for queries to
* this module. Return zero if we succeed.
*/
int lookup_init(const char *mapfmt, int argc, const char * const *argv,
void **context)
{
struct lookup_context *ctxt = NULL;
int rv, l;
LDAP *ldap;
/* If we can't build a context, bail. */
ctxt = (struct lookup_context*) malloc(sizeof(struct lookup_context));
*context = ctxt;
if( ctxt == NULL ) {
syslog(LOG_INFO, MODPREFIX "malloc: %m");
return 1;
}
memset(ctxt, 0, sizeof(struct lookup_context));
/* If a map type isn't explicitly given, parse it like sun entries. */
if( mapfmt == NULL ) {
mapfmt = MAPFMT_DEFAULT;
}
/* Now we sanity-check by binding to the server temporarily. We have to be
* a little strange in here, because we want to provide for use of the
* "default" server, which is set in an ldap.conf file somewhere. */
if(strchr(argv[0], ':') != NULL) {
l = strchr(argv[0], ':') - argv[0];
/* Isolate the server's name. */
ctxt->server = malloc(l + 1);
memset(ctxt->server, 0, l + 1);
memcpy(ctxt->server, argv[0], l);
/* Isolate the base DN. */
ctxt->base = malloc(strlen(argv[0]) - l);
memset(ctxt->base, 0, strlen(argv[0]) - l);
memcpy(ctxt->base, argv[0] + l + 1, strlen(argv[0]) - l - 1);
} else {
/* Use the default server; isolate the base DN's name. */
l = strlen(argv[0]);
ctxt->server = NULL;
ctxt->base = malloc(l + 1);
memset(ctxt->base, 0, l + 1);
memcpy(ctxt->base, argv[0], l);
}
syslog(LOG_DEBUG, MODPREFIX "server = \"%s\", base dn = \"%s\"",
ctxt->server ? ctxt->server : "(default)", ctxt->base);
/* Initialize the LDAP context. */
if( ( ldap = ldap_init(ctxt->server, LDAP_PORT)) == NULL ) {
syslog(LOG_CRIT, MODPREFIX "couldn't initialize LDAP");
return 1;
}
/* Connect to the server as an anonymous user. */
rv = ldap_simple_bind_s(ldap, ctxt->base, NULL);
if( rv != LDAP_SUCCESS ) {
syslog(LOG_CRIT, MODPREFIX "couldn't connect to %s", ctxt->server);
return 1;
}
/* Okay, we're done here. */
ldap_unbind(ldap);
/* Open the parser, if we can. */
return !(ctxt->parser = open_parse(mapfmt, MODPREFIX, argc - 1, argv + 1));
}
/* Lookup by key and pass a filesystem to a parser. */
int lookup_mount(const char *root, const char *name, int name_len, void *context)
{
struct lookup_context *ctxt = (struct lookup_context *) context;
int rv, i, l;
char *query;
LDAPMessage *result, *e;
char **values;
char *attrs[] = {ATTRIBUTE, NULL};
LDAP *ldap;
chdir("/"); /* If this is not here the filesystem stays
busy, for some reason... */
if( ctxt == NULL ) {
syslog(LOG_CRIT, MODPREFIX "context was NULL");
return 0;
}
/* Build a query string. */
l = name_len + strlen("(&(objectclass=" OBJECTCLASS ")(cn=))") + 2;
query = malloc(l);
if( query == NULL ) {
syslog(LOG_INFO, MODPREFIX "malloc: %m");
return 0;
}
memset(query, '\0', l);
if( sprintf(query, "(&(objectclass=" OBJECTCLASS ")(cn=%s))", name) >= l ) {
syslog(LOG_DEBUG, MODPREFIX "error forming query string");
}
query[l - 1] = '\0';
/* Initialize the LDAP context. */
if( (ldap = ldap_init(ctxt->server, LDAP_PORT) ) == NULL ) {
syslog(LOG_CRIT, MODPREFIX "couldn't initialize LDAP connection"
" to %s", ctxt->server ? ctxt->server : "default server");
free(query);
return 1;
}
/* Connect to the server as an anonymous user. */
rv = ldap_simple_bind_s(ldap, ctxt->base, NULL);
if ( rv != LDAP_SUCCESS ) {
syslog(LOG_CRIT, MODPREFIX "couldn't bind to %s",
ctxt->server ? ctxt->server : "default server");
free(query);
return 1;
}
/* Look around. */
syslog(LOG_DEBUG, MODPREFIX "searching for \"%s\"", query);
rv = ldap_search_s(ldap, ctxt->base, LDAP_SCOPE_SUBTREE,
query, attrs, 0, &result);
if( ( rv != LDAP_SUCCESS) || ( result == NULL ) ) {
syslog(LOG_INFO, MODPREFIX "query failed for %s", query);
free(query);
return 1;
}
e = ldap_first_entry(ldap, result);
/* If we got no answers, try it with "/" instead, which makes a better
* wildcard thatn "*" for LDAP, and also happens to be illegal for actual
* directory names. */
if( e == NULL ) {
syslog(LOG_DEBUG, MODPREFIX "no entry for \"%s\" found, trying cn=\"/\"",
name);
sprintf(query, "(&(objectclass=" OBJECTCLASS ")(cn=" WILDCARD "))");
syslog(LOG_DEBUG, MODPREFIX "searching for \"%s\"", query);
rv = ldap_search_s(ldap, ctxt->base, LDAP_SCOPE_SUBTREE,
query, attrs, 0, &result);
if( ( rv != LDAP_SUCCESS) || ( result == NULL ) ) {
syslog(LOG_INFO, MODPREFIX "query failed for %s", query);
free(query);
return 1;
}
syslog(LOG_DEBUG, MODPREFIX "getting first entry for cn=\"/\"");
e = ldap_first_entry(ldap, result);
}
if( e == NULL ) {
syslog(LOG_INFO, MODPREFIX "got answer, but no first entry for %s", query);
free(query);
return 1;
} else {
syslog(LOG_DEBUG, MODPREFIX "examining first entry");
}
values = ldap_get_values(ldap, e, ATTRIBUTE);
if( values == NULL ) {
syslog(LOG_INFO, MODPREFIX "no " ATTRIBUTE " defined for %s", query);
free(query);
return 1;
}
/* Try each of the answers in sucession. */
rv = 1;
for( i = 0 ; ( values[i] != NULL ) && ( rv != 0 ) ; i++ ) {
rv = ctxt->parser->parse_mount(root, name, name_len, values[0],
ctxt->parser->context);
}
/* Clean up. */
ldap_value_free(values);
ldap_msgfree(result);
ldap_unbind(ldap);
free(query);
return rv;
}
/*
* This destroys a context for queries to this module. It releases the parser
* structure (unloading the module) and frees the memory used by the context.
*/
int lookup_done(void *context)
{
struct lookup_context *ctxt = (struct lookup_context *) context;
int rv = close_parse(ctxt->parser);
free(ctxt->server);
free(ctxt->base);
free(ctxt);
return rv;
}
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