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+/* Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @file util_ldap.h
+ * @brief Apache LDAP library
+ */
+
+#ifndef UTIL_LDAP_H
+#define UTIL_LDAP_H
+
+/* APR header files */
+#include "apr.h"
+#include "apr_thread_mutex.h"
+#include "apr_thread_rwlock.h"
+#include "apr_tables.h"
+#include "apr_time.h"
+#include "apr_version.h"
+#if APR_MAJOR_VERSION < 2
+/* The LDAP API is currently only present in APR 1.x */
+#include "apr_ldap.h"
+#include "apr_ldap_rebind.h"
+#else
+#define APR_HAS_LDAP 0
+#endif
+
+#if APR_HAS_SHARED_MEMORY
+#include "apr_rmm.h"
+#include "apr_shm.h"
+#endif
+
+/* this whole thing disappears if LDAP is not enabled */
+#if APR_HAS_LDAP
+
+#if defined(LDAP_UNAVAILABLE) || APR_HAS_MICROSOFT_LDAPSDK
+#define AP_LDAP_IS_SERVER_DOWN(s) ((s) == LDAP_SERVER_DOWN \
+ ||(s) == LDAP_UNAVAILABLE)
+#else
+#define AP_LDAP_IS_SERVER_DOWN(s) ((s) == LDAP_SERVER_DOWN)
+#endif
+
+/* Apache header files */
+#include "ap_config.h"
+#include "httpd.h"
+#include "http_config.h"
+#include "http_core.h"
+#include "http_log.h"
+#include "http_protocol.h"
+#include "http_request.h"
+#include "apr_optional.h"
+
+/* Create a set of LDAP_DECLARE macros with appropriate export
+ * and import tags for the platform
+ */
+#if !defined(WIN32)
+#define LDAP_DECLARE(type) type
+#define LDAP_DECLARE_NONSTD(type) type
+#define LDAP_DECLARE_DATA
+#elif defined(LDAP_DECLARE_STATIC)
+#define LDAP_DECLARE(type) type __stdcall
+#define LDAP_DECLARE_NONSTD(type) type
+#define LDAP_DECLARE_DATA
+#elif defined(LDAP_DECLARE_EXPORT)
+#define LDAP_DECLARE(type) __declspec(dllexport) type __stdcall
+#define LDAP_DECLARE_NONSTD(type) __declspec(dllexport) type
+#define LDAP_DECLARE_DATA __declspec(dllexport)
+#else
+#define LDAP_DECLARE(type) __declspec(dllimport) type __stdcall
+#define LDAP_DECLARE_NONSTD(type) __declspec(dllimport) type
+#define LDAP_DECLARE_DATA __declspec(dllimport)
+#endif
+
+#if APR_HAS_MICROSOFT_LDAPSDK
+#define timeval l_timeval
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/*
+ * LDAP Connections
+ */
+
+/* Values that the deref member can have */
+typedef enum {
+ never=LDAP_DEREF_NEVER,
+ searching=LDAP_DEREF_SEARCHING,
+ finding=LDAP_DEREF_FINDING,
+ always=LDAP_DEREF_ALWAYS
+} deref_options;
+
+/* Structure representing an LDAP connection */
+typedef struct util_ldap_connection_t {
+ LDAP *ldap;
+ apr_pool_t *pool; /* Pool from which this connection is created */
+#if APR_HAS_THREADS
+ apr_thread_mutex_t *lock; /* Lock to indicate this connection is in use */
+#endif
+
+ const char *host; /* Name of the LDAP server (or space separated list) */
+ int port; /* Port of the LDAP server */
+ deref_options deref; /* how to handle alias dereferening */
+
+ const char *binddn; /* DN to bind to server (can be NULL) */
+ const char *bindpw; /* Password to bind to server (can be NULL) */
+
+ int bound; /* Flag to indicate whether this connection is bound yet */
+
+ int secure; /* SSL/TLS mode of the connection */
+ apr_array_header_t *client_certs; /* Client certificates on this connection */
+
+ const char *reason; /* Reason for an error failure */
+
+ struct util_ldap_connection_t *next;
+ struct util_ldap_state_t *st; /* The LDAP vhost config this connection belongs to */
+ int keep; /* Will this connection be kept when it's unlocked */
+
+ int ChaseReferrals; /* [on|off] (default = AP_LDAP_CHASEREFERRALS_ON)*/
+ int ReferralHopLimit; /* # of referral hops to follow (default = AP_LDAP_DEFAULT_HOPLIMIT) */
+ apr_time_t freed; /* the time this conn was placed back in the pool */
+ apr_pool_t *rebind_pool; /* frequently cleared pool for rebind data */
+ int must_rebind; /* The connection was last bound with other then binddn/bindpw */
+ request_rec *r; /* request_rec used to find this util_ldap_connection_t */
+ apr_time_t last_backend_conn; /* the approximate time of the last backend LDAP request */
+} util_ldap_connection_t;
+
+typedef struct util_ldap_config_t {
+ int ChaseReferrals;
+ int ReferralHopLimit;
+ apr_array_header_t *client_certs; /* Client certificates */
+} util_ldap_config_t;
+
+/* LDAP cache state information */
+typedef struct util_ldap_state_t {
+ apr_pool_t *pool; /* pool from which this state is allocated */
+#if APR_HAS_THREADS
+ apr_thread_mutex_t *mutex; /* mutex lock for the connection list */
+#endif
+ apr_global_mutex_t *util_ldap_cache_lock;
+
+ apr_size_t cache_bytes; /* Size (in bytes) of shared memory cache */
+ char *cache_file; /* filename for shm */
+ long search_cache_ttl; /* TTL for search cache */
+ long search_cache_size; /* Size (in entries) of search cache */
+ long compare_cache_ttl; /* TTL for compare cache */
+ long compare_cache_size; /* Size (in entries) of compare cache */
+
+ struct util_ldap_connection_t *connections;
+ apr_array_header_t *global_certs; /* Global CA certificates */
+ int ssl_supported;
+ int secure;
+ int secure_set;
+ int verify_svr_cert;
+
+#if APR_HAS_SHARED_MEMORY
+ apr_shm_t *cache_shm;
+ apr_rmm_t *cache_rmm;
+#endif
+
+ /* cache ald */
+ void *util_ldap_cache;
+
+ long connectionTimeout;
+ struct timeval *opTimeout;
+
+ int debug_level; /* SDK debug level */
+ apr_interval_time_t connection_pool_ttl;
+ int retries; /* number of retries for failed bind/search/compare */
+ apr_interval_time_t retry_delay; /* delay between retries of failed bind/search/compare */
+} util_ldap_state_t;
+
+/* Used to store arrays of attribute labels/values. */
+struct mod_auth_ldap_groupattr_entry_t {
+ char *name;
+};
+
+/**
+ * Open a connection to an LDAP server
+ * @param ldc A structure containing the expanded details of the server
+ * to connect to. The handle to the LDAP connection is returned
+ * as ldc->ldap.
+ * @tip This function connects to the LDAP server and binds. It does not
+ * connect if already connected (ldc->ldap != NULL). Does not bind
+ * if already bound.
+ * @return If successful LDAP_SUCCESS is returned.
+ * @fn int util_ldap_connection_open(request_rec *r,
+ * util_ldap_connection_t *ldc)
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_connection_open,(request_rec *r,
+ util_ldap_connection_t *ldc));
+
+/**
+ * Close a connection to an LDAP server
+ * @param ldc A structure containing the expanded details of the server
+ * that was connected.
+ * @tip This function unbinds from the LDAP server, and clears ldc->ldap.
+ * It is possible to rebind to this server again using the same ldc
+ * structure, using apr_ldap_open_connection().
+ * @fn util_ldap_close_connection(util_ldap_connection_t *ldc)
+ */
+APR_DECLARE_OPTIONAL_FN(void,uldap_connection_close,(util_ldap_connection_t *ldc));
+
+/**
+ * Unbind a connection to an LDAP server
+ * @param ldc A structure containing the expanded details of the server
+ * that was connected.
+ * @tip This function unbinds the LDAP connection, and disconnects from
+ * the server. It is used during error conditions, to bring the LDAP
+ * connection back to a known state.
+ * @fn apr_status_t util_ldap_connection_unbind(util_ldap_connection_t *ldc)
+ */
+APR_DECLARE_OPTIONAL_FN(apr_status_t,uldap_connection_unbind,(void *param));
+
+/**
+ * Find a connection in a list of connections
+ * @param r The request record
+ * @param host The hostname to connect to (multiple hosts space separated)
+ * @param port The port to connect to
+ * @param binddn The DN to bind with
+ * @param bindpw The password to bind with
+ * @param deref The dereferencing behavior
+ * @param secure use SSL on the connection
+ * @tip Once a connection is found and returned, a lock will be acquired to
+ * lock that particular connection, so that another thread does not try and
+ * use this connection while it is busy. Once you are finished with a connection,
+ * apr_ldap_connection_close() must be called to release this connection.
+ * @fn util_ldap_connection_t *util_ldap_connection_find(request_rec *r, const char *host, int port,
+ * const char *binddn, const char *bindpw, deref_options deref,
+ * int netscapessl, int starttls)
+ */
+APR_DECLARE_OPTIONAL_FN(util_ldap_connection_t *,uldap_connection_find,(request_rec *r, const char *host, int port,
+ const char *binddn, const char *bindpw, deref_options deref,
+ int secure));
+
+/**
+ * Compare two DNs for sameness
+ * @param r The request record
+ * @param ldc The LDAP connection being used.
+ * @param url The URL of the LDAP connection - used for deciding which cache to use.
+ * @param dn The first DN to compare.
+ * @param reqdn The DN to compare the first DN to.
+ * @param compare_dn_on_server Flag to determine whether the DNs should be checked using
+ * LDAP calls or with a direct string comparison. A direct
+ * string comparison is faster, but not as accurate - false
+ * negative comparisons are possible.
+ * @tip Two DNs can be equal and still fail a string comparison. Eg "dc=example,dc=com"
+ * and "dc=example, dc=com". Use the compare_dn_on_server unless there are serious
+ * performance issues.
+ * @fn int util_ldap_cache_comparedn(request_rec *r, util_ldap_connection_t *ldc,
+ * const char *url, const char *dn, const char *reqdn,
+ * int compare_dn_on_server)
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_cache_comparedn,(request_rec *r, util_ldap_connection_t *ldc,
+ const char *url, const char *dn, const char *reqdn,
+ int compare_dn_on_server));
+
+/**
+ * A generic LDAP compare function
+ * @param r The request record
+ * @param ldc The LDAP connection being used.
+ * @param url The URL of the LDAP connection - used for deciding which cache to use.
+ * @param dn The DN of the object in which we do the compare.
+ * @param attrib The attribute within the object we are comparing for.
+ * @param value The value of the attribute we are trying to compare for.
+ * @tip Use this function to determine whether an attribute/value pair exists within an
+ * object. Typically this would be used to determine LDAP top-level group
+ * membership.
+ * @fn int util_ldap_cache_compare(request_rec *r, util_ldap_connection_t *ldc,
+ * const char *url, const char *dn, const char *attrib, const char *value)
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_cache_compare,(request_rec *r, util_ldap_connection_t *ldc,
+ const char *url, const char *dn, const char *attrib, const char *value));
+
+/**
+ * An LDAP function that checks if the specified user is a member of a subgroup.
+ * @param r The request record
+ * @param ldc The LDAP connection being used.
+ * @param url The URL of the LDAP connection - used for deciding which cache to use.
+ * @param dn The DN of the object in which we find subgroups to search within.
+ * @param attrib The attribute within group objects that identify users.
+ * @param value The user attribute value we are trying to compare for.
+ * @param subgroupAttrs The attributes within group objects that identify subgroups.
+ * Array of strings.
+ * @param subgroupclasses The objectClass values used to identify groups (and
+ * subgroups). apr_array_header_t *.
+ * @param cur_subgroup_depth Current recursive depth during subgroup processing.
+ * @param max_subgroup_depth Maximum depth of recursion allowed during subgroup
+ * processing.
+ * @tip Use this function to determine whether an attribute/value pair exists within a
+ * starting group object or one of its nested subgroups. Typically this would be
+ * used to determine LDAP nested group membership.
+ * @deffunc int util_ldap_cache_check_subgroups(request_rec *r, util_ldap_connection_t
+ * *ldc, const char *url, const char *dn,
+ * const char *attrib, const char value,
+ * char **subgroupAttrs, apr_array_header_t
+ * *subgroupclasses, int cur_subgroup_depth, int
+ * max_subgroup_depth )
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_cache_check_subgroups,(request_rec *r, util_ldap_connection_t *ldc,
+ const char *url, const char *dn, const char *attrib, const char *value,
+ char **subgroupAttrs, apr_array_header_t *subgroupclasses,
+ int cur_subgroup_depth, int max_subgroup_depth));
+
+/**
+ * Checks a username/password combination by binding to the LDAP server
+ * @param r The request record
+ * @param ldc The LDAP connection being used.
+ * @param url The URL of the LDAP connection - used for deciding which cache to use.
+ * @param basedn The Base DN to search for the user in.
+ * @param scope LDAP scope of the search.
+ * @param attrs LDAP attributes to return in search.
+ * @param filter The user to search for in the form of an LDAP filter. This filter must return
+ * exactly one user for the check to be successful.
+ * @param bindpw The user password to bind as.
+ * @param binddn The DN of the user will be returned in this variable.
+ * @param retvals The values corresponding to the attributes requested in the attrs array.
+ * @tip The filter supplied will be searched for. If a single entry is returned, an attempt
+ * is made to bind as that user. If this bind succeeds, the user is not validated.
+ * @fn int util_ldap_cache_checkuserid(request_rec *r, util_ldap_connection_t *ldc,
+ * char *url, const char *basedn, int scope, char **attrs,
+ * char *filter, char *bindpw, char **binddn, char ***retvals)
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_cache_checkuserid,(request_rec *r, util_ldap_connection_t *ldc,
+ const char *url, const char *basedn, int scope, char **attrs,
+ const char *filter, const char *bindpw, const char **binddn, const char ***retvals));
+
+/**
+ * Searches for a specified user object in an LDAP directory
+ * @param r The request record
+ * @param ldc The LDAP connection being used.
+ * @param url The URL of the LDAP connection - used for deciding which cache to use.
+ * @param basedn The Base DN to search for the user in.
+ * @param scope LDAP scope of the search.
+ * @param attrs LDAP attributes to return in search.
+ * @param filter The user to search for in the form of an LDAP filter. This filter must return
+ * exactly one user for the check to be successful.
+ * @param binddn The DN of the user will be returned in this variable.
+ * @param retvals The values corresponding to the attributes requested in the attrs array.
+ * @tip The filter supplied will be searched for. If a single entry is returned, an attempt
+ * is made to bind as that user. If this bind succeeds, the user is not validated.
+ * @fn int util_ldap_cache_getuserdn(request_rec *r, util_ldap_connection_t *ldc,
+ * char *url, const char *basedn, int scope, char **attrs,
+ * char *filter, char **binddn, char ***retvals)
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_cache_getuserdn,(request_rec *r, util_ldap_connection_t *ldc,
+ const char *url, const char *basedn, int scope, char **attrs,
+ const char *filter, const char **binddn, const char ***retvals));
+
+/**
+ * Checks if SSL support is available in mod_ldap
+ * @fn int util_ldap_ssl_supported(request_rec *r)
+ */
+APR_DECLARE_OPTIONAL_FN(int,uldap_ssl_supported,(request_rec *r));
+
+/* from apr_ldap_cache.c */
+
+/**
+ * Init the LDAP cache
+ * @param pool The pool to use to initialise the cache
+ * @param reqsize The size of the shared memory segment to request. A size
+ * of zero requests the max size possible from
+ * apr_shmem_init()
+ * @fn void util_ldap_cache_init(apr_pool_t *p, util_ldap_state_t *st)
+ * @return The status code returned is the status code of the
+ * apr_smmem_init() call. Regardless of the status, the cache
+ * will be set up at least for in-process or in-thread operation.
+ */
+apr_status_t util_ldap_cache_init(apr_pool_t *pool, util_ldap_state_t *st);
+
+/* from apr_ldap_cache_mgr.c */
+
+/**
+ * Display formatted stats for cache
+ * @param The pool to allocate the returned string from
+ * @tip This function returns a string allocated from the provided pool that describes
+ * various stats about the cache.
+ * @fn char *util_ald_cache_display(apr_pool_t *pool, util_ldap_state_t *st)
+ */
+char *util_ald_cache_display(request_rec *r, util_ldap_state_t *st);
+#ifdef __cplusplus
+}
+#endif
+#endif /* APR_HAS_LDAP */
+#endif /* UTIL_LDAP_H */
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