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-rw-r--r--libraries/librewrite/ldapmap.c454
1 files changed, 454 insertions, 0 deletions
diff --git a/libraries/librewrite/ldapmap.c b/libraries/librewrite/ldapmap.c
new file mode 100644
index 0000000..fc7eeac
--- /dev/null
+++ b/libraries/librewrite/ldapmap.c
@@ -0,0 +1,454 @@
+/* $OpenLDAP$ */
+/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
+ *
+ * Copyright 2000-2021 The OpenLDAP Foundation.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted only as authorized by the OpenLDAP
+ * Public License.
+ *
+ * A copy of this license is available in the file LICENSE in the
+ * top-level directory of the distribution or, alternatively, at
+ * <http://www.OpenLDAP.org/license.html>.
+ */
+/* ACKNOWLEDGEMENT:
+ * This work was initially developed by Pierangelo Masarati for
+ * inclusion in OpenLDAP Software.
+ */
+
+#include <portable.h>
+
+#define LDAP_DEPRECATED 1
+#include "rewrite-int.h"
+#include "rewrite-map.h"
+
+typedef enum {
+ MAP_LDAP_UNKNOWN,
+ MAP_LDAP_EVERYTIME,
+ MAP_LDAP_NOW,
+ MAP_LDAP_LATER
+} bindwhen_t;
+
+/*
+ * LDAP map data structure
+ */
+struct ldap_map_data {
+ char *lm_url;
+ LDAPURLDesc *lm_lud;
+ int lm_version;
+ char *lm_binddn;
+ struct berval lm_cred;
+
+ bindwhen_t lm_when;
+
+ LDAP *lm_ld;
+
+ int lm_wantdn;
+ char *lm_attrs[ 2 ];
+
+#ifdef USE_REWRITE_LDAP_PVT_THREADS
+ ldap_pvt_thread_mutex_t lm_mutex;
+#endif /* USE_REWRITE_LDAP_PVT_THREADS */
+};
+
+static void
+map_ldap_free(
+ struct ldap_map_data *data
+)
+{
+ assert( data != NULL );
+
+ if ( data->lm_url != NULL ) {
+ free( data->lm_url );
+ }
+
+ if ( data->lm_lud != NULL ) {
+ ldap_free_urldesc( data->lm_lud );
+ }
+
+ if ( data->lm_binddn != NULL ) {
+ free( data->lm_binddn );
+ }
+
+ if ( data->lm_cred.bv_val != NULL ) {
+ memset( data->lm_cred.bv_val, 0, data->lm_cred.bv_len );
+ free( data->lm_cred.bv_val );
+ data->lm_cred.bv_val = NULL;
+ data->lm_cred.bv_len = 0;
+ }
+
+ if ( data->lm_when != MAP_LDAP_EVERYTIME && data->lm_ld != NULL ) {
+ ldap_unbind_ext( data->lm_ld, NULL, NULL );
+ }
+
+ free( data );
+}
+
+static void *
+map_ldap_parse(
+ const char *fname,
+ int lineno,
+ int argc,
+ char **argv
+)
+{
+ struct ldap_map_data *data;
+ char *p, *uri;
+
+ assert( fname != NULL );
+ assert( argv != NULL );
+
+ data = calloc( sizeof( struct ldap_map_data ), 1 );
+ if ( data == NULL ) {
+ return NULL;
+ }
+
+ if ( argc < 1 ) {
+ Debug( LDAP_DEBUG_ANY,
+ "[%s:%d] ldap map needs URI\n%s",
+ fname, lineno, "" );
+ free( data );
+ return NULL;
+ }
+
+ uri = argv[ 0 ];
+ if ( strncasecmp( uri, "uri=", STRLENOF( "uri=" ) ) == 0 ) {
+ uri += STRLENOF( "uri=" );
+ }
+
+ data->lm_url = strdup( uri );
+ if ( data->lm_url == NULL ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ if ( ldap_url_parse( uri, &data->lm_lud ) != REWRITE_SUCCESS ) {
+ Debug( LDAP_DEBUG_ANY,
+ "[%s:%d] illegal URI '%s'\n",
+ fname, lineno, argv[ 0 ] );
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ /* trim everything after [host][:port] */
+ p = strchr( data->lm_url, '/' );
+ assert( p[ 1 ] == '/' );
+ if ( ( p = strchr( p + 2, '/' ) ) != NULL ) {
+ p[ 0 ] = '\0';
+ }
+
+ if ( data->lm_lud->lud_attrs == NULL ) {
+ data->lm_attrs[ 0 ] = LDAP_NO_ATTRS;
+ data->lm_wantdn = 1;
+
+ } else {
+ if ( data->lm_lud->lud_attrs[ 1 ] != NULL ) {
+ Debug( LDAP_DEBUG_ANY,
+ "[%s:%d] only one attribute allowed in URI\n",
+ fname, lineno, 0 );
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ if ( strcasecmp( data->lm_lud->lud_attrs[ 0 ], "dn" ) == 0
+ || strcasecmp( data->lm_lud->lud_attrs[ 0 ], "entryDN" ) == 0 )
+ {
+ ldap_memfree( data->lm_lud->lud_attrs[ 0 ] );
+ ldap_memfree( data->lm_lud->lud_attrs );
+ data->lm_lud->lud_attrs = NULL;
+ data->lm_attrs[ 0 ] = LDAP_NO_ATTRS;
+ data->lm_wantdn = 1;
+
+ } else {
+ data->lm_attrs[ 0 ] = data->lm_lud->lud_attrs[ 0 ];
+ }
+ }
+
+ data->lm_attrs[ 1 ] = NULL;
+
+ /* safe defaults */
+ data->lm_version = LDAP_VERSION3;
+
+ for ( argc--, argv++; argc > 0; argc--, argv++ ) {
+ if ( strncasecmp( argv[ 0 ], "binddn=", STRLENOF( "binddn=" ) ) == 0 ) {
+ char *p = argv[ 0 ] + STRLENOF( "binddn=" );
+ int l;
+
+ if ( p[ 0 ] == '\"' || p [ 0 ] == '\'' ) {
+ l = strlen( p ) - 2;
+ p++;
+ if ( p[ l ] != p[ 0 ] ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+ } else {
+ l = strlen( p );
+ }
+
+ data->lm_binddn = strdup( p );
+ if ( data->lm_binddn == NULL ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ if ( data->lm_binddn[ l ] == '\"'
+ || data->lm_binddn[ l ] == '\'' ) {
+ data->lm_binddn[ l ] = '\0';
+ }
+
+ /* deprecated */
+ } else if ( strncasecmp( argv[ 0 ], "bindpw=", STRLENOF( "bindpw=" ) ) == 0 ) {
+ ber_str2bv( argv[ 0 ] + STRLENOF( "bindpw=" ), 0, 1, &data->lm_cred );
+ if ( data->lm_cred.bv_val == NULL ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ } else if ( strncasecmp( argv[ 0 ], "credentials=", STRLENOF( "credentials=" ) ) == 0 ) {
+ ber_str2bv( argv[ 0 ] + STRLENOF( "credentials=" ), 0, 1, &data->lm_cred );
+ if ( data->lm_cred.bv_val == NULL ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ } else if ( strncasecmp( argv[ 0 ], "bindwhen=", STRLENOF( "bindwhen=" ) ) == 0 ) {
+ char *p = argv[ 0 ] + STRLENOF( "bindwhen=" );
+
+ if ( strcasecmp( p, "now" ) == 0 ) {
+ int rc;
+
+ data->lm_when = MAP_LDAP_NOW;
+
+ /*
+ * Init LDAP handler ...
+ */
+ rc = ldap_initialize( &data->lm_ld, data->lm_url );
+ if ( rc != LDAP_SUCCESS ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ ldap_set_option( data->lm_ld,
+ LDAP_OPT_PROTOCOL_VERSION,
+ (void *)&data->lm_version );
+
+#ifdef USE_REWRITE_LDAP_PVT_THREADS
+ ldap_pvt_thread_mutex_init( &data->lm_mutex );
+#endif /* USE_REWRITE_LDAP_PVT_THREADS */
+
+ } else if ( strcasecmp( p, "later" ) == 0 ) {
+ data->lm_when = MAP_LDAP_LATER;
+
+#ifdef USE_REWRITE_LDAP_PVT_THREADS
+ ldap_pvt_thread_mutex_init( &data->lm_mutex );
+#endif /* USE_REWRITE_LDAP_PVT_THREADS */
+
+ } else if ( strcasecmp( p, "everytime" ) == 0 ) {
+ data->lm_when = MAP_LDAP_EVERYTIME;
+ } else {
+ /* ignore ... */
+ }
+
+ } else if ( strncasecmp( argv[ 0 ], "version=", STRLENOF( "version=" ) ) == 0 ) {
+ if ( lutil_atoi( &data->lm_version, argv[ 0 ] + STRLENOF( "version=" ) ) ) {
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ switch ( data->lm_version ) {
+ case LDAP_VERSION2:
+ case LDAP_VERSION3:
+ break;
+
+ default:
+ Debug( LDAP_DEBUG_ANY,
+ "[%s:%d] unknown version %s\n",
+ fname, lineno, p );
+ map_ldap_free( data );
+ return NULL;
+ }
+
+ } else {
+ Debug( LDAP_DEBUG_ANY,
+ "[%s:%d] unknown option %s (ignored)\n",
+ fname, lineno, argv[0] );
+ }
+ }
+
+ if ( data->lm_when == MAP_LDAP_UNKNOWN ) {
+ data->lm_when = MAP_LDAP_EVERYTIME;
+ }
+
+ return ( void * )data;
+}
+
+static int
+map_ldap_apply(
+ void *private,
+ const char *filter,
+ struct berval *val
+
+)
+{
+ LDAP *ld;
+ LDAPMessage *res = NULL, *entry;
+ int rc;
+ struct ldap_map_data *data = private;
+ LDAPURLDesc *lud = data->lm_lud;
+
+ int first_try = 1, set_version = 0;
+
+ assert( private != NULL );
+ assert( filter != NULL );
+ assert( val != NULL );
+
+ val->bv_val = NULL;
+ val->bv_len = 0;
+
+ if ( data->lm_when == MAP_LDAP_EVERYTIME ) {
+ rc = ldap_initialize( &ld, data->lm_url );
+ set_version = 1;
+
+ } else {
+#ifdef USE_REWRITE_LDAP_PVT_THREADS
+ ldap_pvt_thread_mutex_lock( &data->lm_mutex );
+#endif /* USE_REWRITE_LDAP_PVT_THREADS */
+
+ rc = LDAP_SUCCESS;
+
+ if ( data->lm_when == MAP_LDAP_LATER && data->lm_ld == NULL ) {
+ rc = ldap_initialize( &data->lm_ld, data->lm_url );
+ set_version = 1;
+ }
+
+ ld = data->lm_ld;
+ }
+
+ if ( rc != LDAP_SUCCESS ) {
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+
+do_bind:;
+ if ( set_version ) {
+ ldap_set_option( ld, LDAP_OPT_PROTOCOL_VERSION,
+ (void *)&data->lm_version );
+ set_version = 0;
+ }
+
+ if ( data->lm_binddn != NULL ) {
+ rc = ldap_sasl_bind_s( ld, data->lm_binddn,
+ LDAP_SASL_SIMPLE, &data->lm_cred,
+ NULL, NULL, NULL );
+ if ( rc == LDAP_SERVER_DOWN && first_try ) {
+ first_try = 0;
+ if ( ldap_initialize( &ld, data->lm_url ) != LDAP_SUCCESS ) {
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+ set_version = 1;
+ goto do_bind;
+
+ } else if ( rc != REWRITE_SUCCESS ) {
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+ }
+
+ rc = ldap_search_ext_s( ld, lud->lud_dn, lud->lud_scope, ( char * )filter,
+ data->lm_attrs, 0, NULL, NULL, NULL, 1, &res );
+ if ( rc == LDAP_SERVER_DOWN && first_try ) {
+ first_try = 0;
+ if ( ldap_initialize( &ld, data->lm_url ) != LDAP_SUCCESS ) {
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+ set_version = 1;
+ goto do_bind;
+
+ } else if ( rc != LDAP_SUCCESS ) {
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+
+ if ( ldap_count_entries( ld, res ) != 1 ) {
+ ldap_msgfree( res );
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+
+ entry = ldap_first_entry( ld, res );
+ assert( entry != NULL );
+
+ if ( data->lm_wantdn == 1 ) {
+ /*
+ * dn is newly allocated, so there's no need to strdup it
+ */
+ val->bv_val = ldap_get_dn( ld, entry );
+ val->bv_len = strlen( val->bv_val );
+
+ } else {
+ struct berval **values;
+
+ values = ldap_get_values_len( ld, entry, data->lm_attrs[ 0 ] );
+ if ( values != NULL ) {
+ if ( values[ 0 ] != NULL && values[ 0 ]->bv_val != NULL ) {
+#if 0
+ /* NOTE: in principle, multiple values
+ * should not be acceptable according
+ * to the current API; ignore by now */
+ if ( values[ 1 ] != NULL ) {
+ /* error */
+ }
+#endif
+ ber_dupbv( val, values[ 0 ] );
+ }
+ ldap_value_free_len( values );
+ }
+ }
+
+ ldap_msgfree( res );
+
+ if ( val->bv_val == NULL ) {
+ rc = REWRITE_ERR;
+ goto rc_return;
+ }
+
+rc_return:;
+ if ( data->lm_when == MAP_LDAP_EVERYTIME ) {
+ if ( ld != NULL ) {
+ ldap_unbind_ext( ld, NULL, NULL );
+ }
+
+ } else {
+ data->lm_ld = ld;
+#ifdef USE_REWRITE_LDAP_PVT_THREADS
+ ldap_pvt_thread_mutex_unlock( &data->lm_mutex );
+#endif /* USE_REWRITE_LDAP_PVT_THREADS */
+ }
+
+ return rc;
+}
+
+static int
+map_ldap_destroy(
+ void *private
+)
+{
+ struct ldap_map_data *data = private;
+
+ assert( private != NULL );
+
+ map_ldap_free( data );
+
+ return 0;
+}
+
+const rewrite_mapper rewrite_ldap_mapper = {
+ "ldap",
+ map_ldap_parse,
+ map_ldap_apply,
+ map_ldap_destroy
+};
+