base.h

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#pragma once
/**
 * $Id: 172376fc8ddf3b582ac0a48639f629f42b9ae523 $
 * @file lib/ldap/base.h
 * @brief Common utility functions for interacting with LDAP directories
 *
 * @author Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 *
 * @copyright 2017 The FreeRADIUS Server Project.
 * @copyright 2017 Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 */
#include <freeradius-devel/server/base.h>
#include <freeradius-devel/server/connection.h>
#include <freeradius-devel/server/global_lib.h>
#include <freeradius-devel/server/map.h>
#include <freeradius-devel/server/trunk.h>
#include <freeradius-devel/unlang/function.h>
#include <freeradius-devel/util/dlist.h>
 
#define LDAP_DEPRECATED 0       /* Quiet warnings about LDAP_DEPRECATED not being defined */
 
#include <lber.h>
#include <ldap.h>
#include "config.h"
 
extern LDAP *ldap_global_handle;
 
/*
 *      Framework on OSX doesn't export the symbols but leaves
 *      the macro defined *sigh*.
 */
#ifndef HAVE_LDAP_CREATE_SESSION_TRACKING_CONTROL
#  undef LDAP_CONTROL_X_SESSION_TRACKING
#endif
 
/*
 *      There's a typo in libldap's ldap.h which was fixed by
 *      Howard Chu in 19aeb1cd. This typo had the function defined
 *      as ldap_create_session_tracking_control but declared as
 *      ldap_create_session_tracking.
 *
 *      We fix this, by adding the correct declaration here.
 */
#ifdef LDAP_CONTROL_X_SESSION_TRACKING
#  if !defined(HAVE_DECL_LDAP_CREATE_SESSION_TRACKING_CONTROL) || (HAVE_DECL_LDAP_CREATE_SESSION_TRACKING_CONTROL == 0)
LDAP_F( int )
ldap_create_session_tracking_control LDAP_P((
        LDAP            *ld,
        char            *sessionSourceIp,
        char            *sessionSourceName,
        char            *formatOID,
        struct berval   *sessionTrackingIdentifier,
        LDAPControl     **ctrlp ));
#  endif
#endif
 
/*
 *      Because the LTB people define LDAP_VENDOR_VERSION_PATCH
 *      as X, which precludes its use in printf statements *sigh*
 *
 *      Identifiers that are not macros, all evaluate to 0,
 *      which is why this works.
 */
#define X 0
#if !defined(LDAP_VENDOR_VERSION_PATCH) || LDAP_VENDOR_VERSION_PATCH == 0
#  undef LDAP_VENDOR_VERSION_PATCH
#  define LDAP_VENDOR_VERSION_PATCH 0
#endif
#undef X
 
/*
 *      For compatibility with other LDAP libraries
 */
#if !defined(LDAP_SCOPE_BASE) && defined(LDAP_SCOPE_BASEOBJECT)
#  define LDAP_SCOPE_BASE LDAP_SCOPE_BASEOBJECT
#endif
 
#if !defined(LDAP_SCOPE_ONE) && defined(LDAP_SCOPE_ONELEVEL)
#  define LDAP_SCOPE_ONE LDAP_SCOPE_ONELEVEL
#endif
 
#if !defined(LDAP_SCOPE_SUB) && defined(LDAP_SCOPE_SUBTREE)
#  define LDAP_SCOPE_SUB LDAP_SCOPE_SUBTREE
#endif
 
#if !defined(LDAP_OPT_RESULT_CODE) && defined(LDAP_OPT_ERROR_NUMBER)
#  define LDAP_OPT_RESULT_CODE LDAP_OPT_ERROR_NUMBER
#endif
 
#ifndef LDAP_CONST
#  define LDAP_CONST
#endif
 
#define LDAP_MAX_CONTROLS               10              //!< Maximum number of client/server controls.
                                                        //!< Used to allocate static arrays of control pointers.
#define LDAP_MAX_ATTRMAP                128             //!< Maximum number of mappings between LDAP and
                                                        //!< FreeRADIUS attributes.
#define LDAP_MAP_RESERVED               5               //!< Number of additional items to allocate in expanded
                                                        //!< attribute name arrays. Currently for enable attribute,
                                                        //!< group membership attribute, valuepair attribute,
                                                        //!< profile attribute and profile suspend attribute.
 
#define LDAP_MAX_CACHEABLE              64              //!< Maximum number of groups we retrieve from the server for
                                                        //!< a given user which need resolving from name to DN or DN
                                                        //!< to name.  If more than this require resolving, the
                                                        //!< module returns invalid.
 
#define LDAP_MAX_GROUP_NAME_LEN         128             //!< Maximum name of a group name.
#define LDAP_MAX_ATTR_STR_LEN           256             //!< Maximum length of an xlat expanded LDAP attribute.
#define LDAP_MAX_FILTER_STR_LEN         1024            //!< Maximum length of an xlat expanded filter.
#define LDAP_MAX_DN_STR_LEN             1024            //!< Maximum length of an xlat expanded DN.
 
#define LDAP_VIRTUAL_DN_ATTR            "dn"            //!< 'Virtual' attribute which maps to the DN of the object.
 
#define LDAP_SERVER_NOTIFICATION_OID    "1.2.840.113556.1.4.528"        //!< OID of Active Directory control for
                                                                        //!< persistent search.
#define LDAP_SERVER_SHOW_DELETED_OID    "1.2.840.113556.1.4.417"        //!< OID of Active Directory control which
                                                                        //!< enables searching for deleted objects.
#define LDAP_MATCHING_RULE_BIT_AND      "1.2.840.113556.1.4.803"        //!< OID of bit-wise AND LDAP match rule
#define LDAP_MATCHING_RULE_BIT_OR       "1.2.840.113556.1.4.804"        //!< OID of bit-wise OR LDAP match rule
 
typedef enum {
        LDAP_EXT_UNSUPPORTED,                           //!< Unsupported extension.
        LDAP_EXT_BINDNAME,                              //!< Specifies the user DN or name for an LDAP bind.
        LDAP_EXT_BINDPW,                                //!< Specifies the password for an LDAP bind.
} ldap_supported_extension_t;
 
typedef struct {
        char const      *mech;                          //!< SASL mech(s) to try.
        char const      *proxy;                         //!< Identity to proxy.
        char const      *realm;                         //!< Kerberos realm.
} fr_ldap_sasl_t;
 
typedef struct {
        LDAPControl     *control;                       //!< LDAP control.
        bool            freeit;                         //!< Whether the control should be freed after
                                                        //!< we've finished using it.
} fr_ldap_control_t;
 
typedef enum {
        FR_LDAP_DIRECTORY_UNKNOWN = 0,                  //!< We can't determine the directory server.
 
        FR_LDAP_DIRECTORY_ACTIVE_DIRECTORY,             //!< Directory server is Active Directory.
        FR_LDAP_DIRECTORY_EDIRECTORY,                   //!< Directory server is eDir.
        FR_LDAP_DIRECTORY_IBM,                          //!< Directory server is IBM.
        FR_LDAP_DIRECTORY_NETSCAPE,                     //!< Directory server is Netscape.
        FR_LDAP_DIRECTORY_OPENLDAP,                     //!< Directory server is OpenLDAP.
        FR_LDAP_DIRECTORY_ORACLE_INTERNET_DIRECTORY,    //!< Directory server is Oracle Internet Directory.
        FR_LDAP_DIRECTORY_ORACLE_UNIFIED_DIRECTORY,     //!< Directory server is Oracle Unified Directory.
        FR_LDAP_DIRECTORY_ORACLE_VIRTUAL_DIRECTORY,     //!< Directory server is Oracle Virtual Directory.
        FR_LDAP_DIRECTORY_SUN_ONE_DIRECTORY,            //!< Directory server is Sun One Directory.
        FR_LDAP_DIRECTORY_SIEMENS_AG,                   //!< Directory server is Siemens AG.
        FR_LDAP_DIRECTORY_UNBOUND_ID                    //!< Directory server is Unbound ID
} fr_ldap_directory_type_t;
 
typedef enum {
        FR_LDAP_SYNC_NONE = 0,                          //!< No support for LDAP sync
        FR_LDAP_SYNC_RFC4533,                           //!< Directory supports RFC 4533
        FR_LDAP_SYNC_ACTIVE_DIRECTORY,                  //!< Directory supports AD style persistent search.
        FR_LDAP_SYNC_PERSISTENT_SEARCH                  //!< Directory supports persistent search
} fr_ldap_sync_type_t;
 
/** LDAP connection handle states
 *
 */
typedef enum {
        FR_LDAP_STATE_INIT = 0,                         //!< Connection uninitialised.
        FR_LDAP_STATE_START_TLS,                        //!< TLS is being negotiated.
        FR_LDAP_STATE_BIND,                             //!< Connection is being bound.
        FR_LDAP_STATE_RUN,                              //!< Connection is muxing/demuxing requests.
        FR_LDAP_STATE_ERROR                             //!< Connection is in an error state.
} fr_ldap_state_t;
 
/** Types of LDAP requests
 *
 */
typedef enum {
        LDAP_REQUEST_SEARCH = 1,                        //!< A lookup in an LDAP directory
        LDAP_REQUEST_MODIFY,                            //!< A modification to an LDAP entity
        LDAP_REQUEST_EXTENDED                           //!< An extended LDAP operation
} fr_ldap_request_type_t;
 
/** LDAP query result codes
 *
 */
typedef enum {
        LDAP_RESULT_PENDING = 1,                        //!< Result not yet returned
        LDAP_RESULT_SUCCESS = 0,                        //!< Successfully got LDAP results
        LDAP_RESULT_ERROR = -1,                         //!< A general error occurred
        LDAP_RESULT_TIMEOUT = -2,                       //!< The query timed out
        LDAP_RESULT_BAD_DN = -3,                        //!< The requested DN does not exist
        LDAP_RESULT_NO_RESULT = -4,                     //!< No results returned
        LDAP_RESULT_REFERRAL_FAIL = -5,                 //!< Initial results indicated a referral was needed
                                                        ///< but the referral could not be followed
        LDAP_RESULT_EXCESS_REFERRALS = -6,              //!< The referral chain took too many hops
        LDAP_RESULT_MISSING_REFERRAL = -7,              //!< A referral was indicated but no URL was provided
} fr_ldap_result_code_t;
 
typedef struct {
        char const              *vendor_str;            //!< As returned from the vendorName attribute in the
                                                        ///< rootDSE.
        char const              *version_str;           //!< As returned from the vendorVersion attribute in the
                                                        ///< rootDSE.
        fr_ldap_directory_type_t type;                  ///< Canonical server implementation.
 
        bool                    cleartext_password;     //!< Whether the server will return the user's plaintext
                                                        ///< password.
 
        fr_ldap_sync_type_t     sync_type;              //!< What kind of LDAP sync this directory supports.
 
        char const              **naming_contexts;      //!< Databases served by this directory.
} fr_ldap_directory_t;
 
/** Connection configuration
 *
 * Must not be passed into functions except via the connection handle
 * this avoids problems with not using the connection pool configuration.
 */
typedef struct {
        char const              *name;                  //!< Name of the module that created this connection.
 
        char                    *server;                //!< Initial server to bind to.
        char const              **server_str;           //!< Server set in the config.
 
        uint16_t                port;                   //!< Port to use when binding to the server.
 
        char const              *admin_identity;        //!< Identity we bind as when we need to query the LDAP
                                                        ///< directory.
        char const              *admin_password;        //!< Password used in administrative bind.
 
        fr_ldap_sasl_t          admin_sasl;             //!< SASL parameters used when binding as the admin.
 
        const char              *sasl_secprops;         //!< SASL Security Properties to set.
 
        int                     dereference;            //!< libldap value specifying dereferencing behaviour.
        char const              *dereference_str;       //!< When to dereference (never, searching, finding, always)
 
        bool                    chase_referrals;        //!< If the LDAP server returns a referral to another server
                                                        ///< or point in the tree, follow it, establishing new
                                                        ///< connections and binding where necessary.
        bool                    chase_referrals_unset;  //!< If true, use the OpenLDAP defaults for chase_referrals.
 
        bool                    use_referral_credentials;       //!< If true use credentials from the referral URL.
 
        uint16_t                referral_depth;         //!< How many referrals to chase
 
        bool                    rebind;                 //!< If use_referral_credentials is false, controls whether we
                                                        ///< bind as our admin credentials (true) or anonymously (false)
                                                        ///< when connecting to a different server to follow a referral
 
        /*
         *      TLS items.
         */
        int                     tls_mode;
 
        bool                    start_tls;              //!< Send the Start TLS message to the LDAP directory
                                                        ///< to start encrypted communications using the standard
                                                        ///< LDAP port.
 
        char const              *tls_ca_file;           //!< Sets the full path to a CA certificate (used to validate
                                                        ///< the certificate the server presents).
 
        char const              *tls_ca_path;           //!< Sets the path to a directory containing CA certificates.
 
        char const              *tls_certificate_file;  //!< Sets the path to the public certificate file we present
                                                        ///< to the servers.
 
        char const              *tls_private_key_file;  //!< Sets the path to the private key for our public
                                                        ///< certificate.
 
        char const              *tls_require_cert_str;  //!< Sets requirements for validating the certificate the
                                                        ///< server presents.
 
        int                     tls_require_cert;       //!< OpenLDAP constant representing the require cert string.
 
        char const              *tls_min_version_str;   //!< Minimum TLS version
        int                     tls_min_version;
 
        /*
         *      For keep-alives.
         */
        fr_time_delta_t         keepalive_idle;         //!< Number of seconds a connections needs to remain idle
                                                        //!< before TCP starts sending keepalive probes.
 
        uint32_t                keepalive_probes;       //!< Number of missed timeouts before the connection is
                                                        ///< dropped.
 
        fr_time_delta_t         keepalive_interval;     //!< Interval between keepalive probes.
 
        /*
         *      Search timelimits
         */
        fr_time_delta_t         srv_timelimit;          //!< How long the server should spent on a single request
                                                        ///< (also bounded by value on the server).
 
        fr_time_delta_t         res_timeout;            //!< How long we wait for results.
 
        /*
         *      I/O timelimits.
         */
        fr_time_delta_t         net_timeout;            //!< How long we wait in blocking network calls.
                                                        ///< We set this in the LDAP API, even though with
                                                        ///< async calls, we control this using our event loop.
                                                        ///< This is just in case there are blocking calls which
                                                        ///< happen internally which we can't work around.
 
        fr_time_delta_t         tls_handshake_timeout;  //!< How long we wait for the TLS handshake to complete.
 
        fr_time_delta_t         reconnection_delay;     //!< How long to wait before attempting to reconnect.
 
        fr_time_delta_t         idle_timeout;           //!< How long to wait before closing unused connections.
} fr_ldap_config_t;
 
/** libldap global configuration data
 *
 */
typedef struct {
        uint32_t                ldap_debug;             //!< LDAP debug level
        char const              *tls_random_file;       //!< Path to the ramdon file if /dev/random and /dev/urandom
                                                        //!< are unavailable
} fr_libldap_global_config_t;
 
extern global_lib_autoinst_t fr_libldap_global_config;
 
typedef struct fr_ldap_thread_trunk_s fr_ldap_thread_trunk_t;
 
/** Tracks the state of a libldap connection handle
 *
 */
typedef struct {
        LDAP                    *handle;                //!< libldap handle.
 
        fr_ldap_control_t       serverctrls[LDAP_MAX_CONTROLS + 1];     //!< Server controls to use for all operations
                                                                        ///< with this handle.
        fr_ldap_control_t       clientctrls[LDAP_MAX_CONTROLS + 1];     //!< Client controls to use for all operations
                                                                        ///< with this handle.
        int                     serverctrls_cnt;        //!< Number of server controls associated with the handle.
        int                     clientctrls_cnt;        //!< Number of client controls associated with the handle.
 
        fr_ldap_directory_t     *directory;             //!< The type of directory we're connected to.
 
        fr_ldap_config_t const  *config;                //!< rlm_ldap connection configuration.
        fr_connection_t         *conn;                  //!< Connection state handle.
 
        fr_ldap_state_t         state;                  //!< LDAP connection state machine.
 
        int                     fd;                     //!< File descriptor for this connection.
 
        fr_rb_tree_t            *queries;               //!< Outstanding queries on this connection
        fr_dlist_head_t         refs;                   //!< Replied to queries still referencing this connection.
 
        void                    *uctx;                  //!< User data associated with the handle.
} fr_ldap_connection_t;
 
/** Contains a collection of values
 *
 */
typedef struct {
        struct berval           **values;               //!< libldap struct containing bv_val (char *)
                                                        ///< and length bv_len.
        int                     count;                  //!< Number of values.
} fr_ldap_result_t;
 
/** Result of expanding the RHS of a set of maps
 *
 * Used to store the array of attributes we'll be querying for.
 */
typedef struct {
        map_list_t      const *maps;                    //!< Head of list of maps we expanded the RHS of.
        char const      *attrs[LDAP_MAX_ATTRMAP + LDAP_MAP_RESERVED + 1]; //!< Reserve some space for access attributes
                                                        //!< and NULL termination.
        TALLOC_CTX      *ctx;                           //!< Context to allocate new attributes in.
        int             count;                          //!< Index on next free element.
} fr_ldap_map_exp_t;
 
/** Thread specific structure to manage LDAP trunk connections.
 *
 */
typedef struct {
        fr_rb_tree_t            *trunks;        //!< Tree of LDAP trunks used by this thread
        fr_ldap_config_t        *config;        //!< Module instance config
        fr_trunk_conf_t         *trunk_conf;    //!< Module trunk config
        fr_trunk_conf_t         *bind_trunk_conf;       //!< Trunk config for bind auth trunk
        fr_event_list_t         *el;            //!< Thread event list for callbacks / timeouts
        fr_ldap_thread_trunk_t  *bind_trunk;    //!< LDAP trunk used for bind auths
        fr_rb_tree_t            *binds;         //!< Tree of outstanding bind auths
} fr_ldap_thread_t;
 
/** Thread LDAP trunk structure
 *
 * One fr_ldap_thread_trunk_t will be allocated for each destination a thread needs
 * to create an LDAP trunk connection to.
 *
 * Used to hold config regarding the LDAP connection and associate pending queries
 * with the trunk they are running on.
 */
typedef struct fr_ldap_thread_trunk_s {
        fr_rb_node_t            node;           //!< Entry in the tree of connections
        char const              *uri;           //!< Server URI for this connection
        char const              *bind_dn;       //!< DN connection is bound as
        fr_ldap_config_t        config;         //!< Config used for this connection
        fr_ldap_directory_t     *directory;     //!< The type of directory we're connected to.
        fr_trunk_t              *trunk;         //!< Connection trunk
        fr_ldap_thread_t        *t;             //!< Thread this connection is associated with
        fr_event_timer_t const  *ev;            //!< Event to close the thread when it has been idle.
} fr_ldap_thread_trunk_t;
 
typedef struct fr_ldap_referral_s fr_ldap_referral_t;
 
typedef struct fr_ldap_query_s fr_ldap_query_t;
 
typedef void (*fr_ldap_result_parser_t)(LDAP *handle, fr_ldap_query_t *query, LDAPMessage *head, void *rctx);
 
/** LDAP query structure
 *
 * Used to hold the elements of an LDAP query and track its progress.
 * libldap structures will be freed by the talloc destructor.
 * The same structure is used both for search queries and modifications
 */
struct fr_ldap_query_s {
        fr_rb_node_t            node;           //!< Entry in the tree of outstanding queries.
        fr_dlist_t              entry;          //!< Entry in the list of connection references.
 
        LDAPURLDesc             *ldap_url;      //!< parsed URL for current query if the source
                                                ///< of the query was a URL.
 
        char const              *dn;            //!< Base DN for searches, DN for modifications.
 
        union {
                struct {
                        char const      **attrs;        //!< Attributes being requested in a search.
                        int             scope;          //!< Search scope.
                        char const      *filter;        //!< Filter for search.
                } search;
                struct {
                        char const      *reqoid;        //!< OID of extended operation to perform.
                        struct berval   *reqdata;       //!< Data required for the request.
                } extended;
                LDAPMod                 **mods;         //!< Changes to be applied if this query is a modification.
        };
 
        fr_ldap_request_type_t  type;                   //!< What type of query this is.
 
        fr_ldap_control_t       serverctrls[LDAP_MAX_CONTROLS]; //!< Server controls specific to this query.
        fr_ldap_control_t       clientctrls[LDAP_MAX_CONTROLS]; //!< Client controls specific to this query.
 
 
        int                     msgid;          //!< The unique identifier for this query.
                                                ///< Uniqueness is only per connection.
 
        fr_trunk_request_t      *treq;          //!< Trunk request this query is associated with
        fr_ldap_connection_t    *ldap_conn;     //!< LDAP connection this query is running on.
 
        fr_event_timer_t const  *ev;            //!< Event for timing out the query
 
        char                    **referral_urls;        //!< Referral results to follow
        fr_dlist_head_t         referrals;      //!< List of parsed referrals
        uint16_t                referral_depth; //!< How many referrals we have followed
        fr_ldap_referral_t      *referral;      //!< Referral actually being followed
 
        fr_ldap_result_parser_t parser;         //!< Custom results parser.
 
        LDAPMessage             *result;        //!< Head of LDAP results list.
 
        fr_ldap_result_code_t   ret;            //!< Result code
};
 
/** Parsed LDAP referral structure
 *
 * When LDAP servers respond with a referral, it is parsed into one or more fr_ldap_referral_t
 * and kept until the referral has been followed.
 * Avoids repeated parsing of the referrals as provided by libldap.
 */
typedef struct fr_ldap_referral_s {
        fr_dlist_t              entry;          //!< Entry in list of possible referrals
        fr_ldap_query_t         *query;         //!< Query this referral relates to
        LDAPURLDesc             *referral_url;  //!< URL for the referral
        char                    *host_uri;      //!< Host URI used for referral connection
        char const              *identity;      //!< Bind identity for referral connection
        char const              *password;      //!< Bind password for referral connection
        fr_ldap_thread_trunk_t  *ttrunk;        //!< Trunk this referral should use
        request_t               *request;       //!< Request this referral relates to
} fr_ldap_referral_t;
 
/** Holds arguments for the async bind operation
 *
 */
typedef struct {
        fr_ldap_connection_t    *c;                     //!< to bind.  Only used when binding as admin user.
        char const              *bind_dn;               //!< of the user, may be NULL to bind anonymously.
        char const              *password;              //!< of the user, may be NULL if no password is specified.
        LDAPControl             **serverctrls;          //!< Controls to pass to the server.
        LDAPControl             **clientctrls;          //!< Controls to pass to the client (library).
 
        int                     msgid;                  //!< Of the bind operation.  Only used when binding as admin.
} fr_ldap_bind_ctx_t;
 
/** Holds arguments for the async SASL bind operation
 *
 */
typedef struct {
        fr_ldap_connection_t    *c;                     //!< to bind.  Only used when binding as admin user.
        char const              *mechs;                 //!< SASL mechanisms to run
        char const              *identity;              //!< of the user.
        char const              *password;              //!< of the user, may be NULL if no password is specified.
        char const              *proxy;                 //!< Proxy identity, may be NULL in which case identity is used.
        char const              *realm;                 //!< SASL realm (may be NULL).
        LDAPControl             **serverctrls;          //!< Controls to pass to the server.
        LDAPControl             **clientctrls;          //!< Controls to pass to the client (library).
 
        int                     msgid;                  //!< Last msgid.  Only used when binding as admin user.
        LDAPMessage             *result;                //!< Previous result.
        char const              *rmech;                 //!< Mech we're continuing with.
} fr_ldap_sasl_ctx_t;
 
typedef enum {
        LDAP_BIND_SIMPLE                = 0,
#ifdef WITH_SASL
        LDAP_BIND_SASL
#endif
} fr_ldap_bind_type_t;
 
typedef struct ldap_filter_s ldap_filter_t;
 
/** Types of parsed LDAP filter nodes
 */
typedef enum {
        LDAP_FILTER_NODE                = 0,            //!< The filter node is an individual one
                                                        //!< to be evaluated against an attribute.
        LDAP_FILTER_GROUP                               //!< The filter node is a parent of a group
                                                        //!< which will be combined using a logical operator.
} ldap_filter_type_t;
 
/** Logical operators for use in LDAP filters
 */
typedef enum {
        LDAP_FILTER_LOGIC_AND           = 1,
        LDAP_FILTER_LOGIC_OR,
        LDAP_FILTER_LOGIC_NOT
} ldap_filter_logic_t;
 
/** Operators for use in LDAP filters
 */
typedef enum {
        LDAP_FILTER_OP_UNSET            = 0,            //!< Attribute not set yet
        LDAP_FILTER_OP_EQ,                              //!< Attribute equals value
        LDAP_FILTER_OP_SUBSTR,                          //!< Attribute matches string with wildcards
        LDAP_FILTER_OP_PRESENT,                         //!< Attribute present
        LDAP_FILTER_OP_GE,                              //!< Attribute greater than or equal to value
        LDAP_FILTER_OP_LE,                              //!< Attribute less than or equal to value
        LDAP_FILTER_OP_BIT_AND,                         //!< Bitwise AND comparison
        LDAP_FILTER_OP_BIT_OR                           //!< Bitwise OR comparison
} ldap_filter_op_t;
 
/** Structure to hold parsed details of LDAP filters
 */
struct ldap_filter_s {
        fr_dlist_t              entry;                  //!< Entry in the list of filter nodes.
        ldap_filter_type_t      filter_type;            //!< Type of this filter node.
        char                    *orig;                  //!< Text representation of filter for debug messages,
        union {
                struct {
                        ldap_filter_logic_t     logic_op;       //!< Logical operator for this group.
                        fr_dlist_head_t         children;       //!< List of child nodes in this group.
                };
                struct {
                        char                    *attr;          //!< Attribute for the filter node.
                        ldap_filter_op_t        op;             //!< Operator to be used for comparison.
                        fr_value_box_t          *value;         //!< Value to compare with.
                };
        };
};
 
/** Codes returned by fr_ldap internal functions
 *
 */
typedef enum {
        LDAP_PROC_REFERRAL = 2,                         //!< LDAP server returned referral URLs.
        LDAP_PROC_CONTINUE = 1,                         //!< Operation is in progress.
        LDAP_PROC_SUCCESS = 0,                          //!< Operation was successful.
 
        LDAP_PROC_ERROR = -1,                           //!< Unrecoverable library/server error.
 
        LDAP_PROC_BAD_CONN = -2,                        //!< Transitory error, caller should retry the operation
                                                        //!< with a new connection.
 
        LDAP_PROC_NOT_PERMITTED = -3,                   //!< Operation was not permitted, either current user was
                                                        //!< locked out in the case of binds, or has insufficient
                                                        //!< access.
 
        LDAP_PROC_REJECT = -4,                          //!< Bind failed, user was rejected.
 
        LDAP_PROC_BAD_DN = -5,                          //!< Specified an invalid object in a bind or search DN.
 
        LDAP_PROC_NO_RESULT = -6,                       //!< Got no results.
 
        LDAP_PROC_TIMEOUT = -7,                         //!< Operation timed out.
 
        LDAP_PROC_REFRESH_REQUIRED = -8                 //!< Don't continue with the current refresh phase,
                                                        //!< exit, and retry the operation with a NULL cookie.
} fr_ldap_rcode_t;
 
/** Holds arguments for async bind auth requests
 *
 * Used when LDAP binds are being used to authenticate users, rather than admin binds.
 * Allows tracking of multiple bind requests on a single connection.
 */
typedef struct {
        fr_rb_node_t            node;           //!< Entry in the tree of outstanding bind requests.
        fr_ldap_thread_t        *thread;        //!< This bind is being run by.
        fr_trunk_request_t      *treq;          //!< Trunk request this bind is associated with.
        int                     msgid;          //!< libldap msgid for this bind.
        request_t               *request;       //!< this bind relates to.
        fr_ldap_bind_type_t     type;           //!< type of bind.
        union {
                fr_ldap_bind_ctx_t      *bind_ctx;      //!< User data for simple binds.
                fr_ldap_sasl_ctx_t      *sasl_ctx;      //!< User data for SASL binds.
        };
        fr_ldap_rcode_t         ret;            //!< Return code of bind operation.
} fr_ldap_bind_auth_ctx_t;
 
/*
 *      Tables for resolving strings to LDAP constants
 */
extern fr_table_num_sorted_t const fr_ldap_connection_states[];
extern size_t fr_ldap_connection_states_len;
 
extern fr_table_num_sorted_t const fr_ldap_supported_extensions[];
extern size_t fr_ldap_supported_extensions_len;
extern fr_table_num_sorted_t const fr_ldap_dereference[];
extern size_t fr_ldap_dereference_len;
extern fr_table_num_sorted_t const fr_ldap_scope[];
extern size_t fr_ldap_scope_len;
extern fr_table_num_sorted_t const fr_ldap_tls_require_cert[];
extern size_t fr_ldap_tls_require_cert_len;
 
/** Inline function to copy pointers from a berval to a valuebox
 *
 * @note This results in a shallow copy of the berval, so if the berval is freed
 *      the value box becomes invalidated.
 *
 * @param[out] value    to write berval values to.
 * @param[in] berval    to copy pointers/lengths from.
 */
static inline void fr_ldap_berval_to_value_shallow(fr_value_box_t *value, struct berval *berval)
{
        fr_value_box_memdup_shallow(value, NULL, (uint8_t *)berval->bv_val, berval->bv_len, true);
}
 
/** Inline function to copy pointer from a berval to a string value box
 *
 * Useful for printing contents of bervals known to contain strings in DEBUG output since
 * they are not NULL terminated.
 *
 * @note This results in a shallow copy of the berval, so if the berval is freed
 *      the value box becomes invalidated.
 *
 * @param[out] value    to write berval value to.
 * @param[in] berval    top copy pointer / length from.
 */
static inline void fr_ldap_berval_to_value_str_shallow(fr_value_box_t *value, struct berval *berval)
{
        fr_value_box_bstrndup_shallow(value, NULL, berval->bv_val, berval->bv_len, true);
}
 
/** Compare a berval with a C string of a known length using case insensitive comparison
 *
 * @param[in] value     berval.
 * @param[in] str       String to compare with value.
 * @param[in] strlen    Number of characters of str to compare.
 */
static inline int fr_ldap_berval_strncasecmp(struct berval *value, char const *str, size_t strlen)
{
        size_t i;
        if (strlen != value->bv_len) return CMP(strlen, value->bv_len);
 
        for (i = 0; i < strlen; i++) {
                if (tolower(value->bv_val[i]) != tolower(str[i])) return CMP(value->bv_val[i], str[i]);
        }
 
        return 0;
}
 
/** Compare two ldap trunk structures on connection URI / DN
 *
 * @param[in] one       first connection to compare.
 * @param[in] two       second connection to compare.
 * @return CMP(one, two)
 */
static inline int8_t fr_ldap_trunk_cmp(void const *one, void const *two)
{
        fr_ldap_thread_trunk_t const    *a = one, *b = two;
        int8_t uricmp = CMP(strcmp(a->uri, b->uri), 0);
 
        if (uricmp !=0) return uricmp;
        if (!a->bind_dn || !b->bind_dn) return CMP(a->bind_dn, b->bind_dn);
        return CMP(strcmp(a->bind_dn, b->bind_dn), 0);
}
 
/** Compare two ldap query structures on msgid
 *
 * @param[in] one       first query to compare.
 * @param[in] two       second query to compare.
 * @return CMP(one,two)
 */
static inline int8_t fr_ldap_query_cmp(void const *one, void const *two)
{
        fr_ldap_query_t const   *a = one, *b = two;
 
        return CMP(a->msgid, b->msgid);
}
 
/** Compare two ldap bind auth structures on msgid
 *
 * @param[in] one       first bind request to compare.
 * @param[in] two       second bind request to compare.
 * @return CMP(one,two)
 */
static inline int8_t fr_ldap_bind_auth_cmp(void const *one, void const *two)
{
        fr_ldap_bind_auth_ctx_t const   *a = one, *b = two;
 
        return CMP(a->msgid, b->msgid);
}
 
fr_ldap_query_t *fr_ldap_search_alloc(TALLOC_CTX *ctx,
                                      char const *base_dn, int scope, char const *filter, char const * const * attrs,
                                      LDAPControl **serverctrls, LDAPControl **clientctrls);
 
fr_ldap_query_t *fr_ldap_modify_alloc(TALLOC_CTX *ctx, char const *dn,
                                      LDAPMod *mods[], LDAPControl **serverctrls, LDAPControl **clientctrls);
 
fr_ldap_query_t *fr_ldap_extended_alloc(TALLOC_CTX *ctx, char const *reqiod, struct berval *reqdata,
                                        LDAPControl **serverctrls, LDAPControl **clientctrls);
 
unlang_action_t fr_ldap_trunk_search(TALLOC_CTX *ctx,
                                     fr_ldap_query_t **out, request_t *request, fr_ldap_thread_trunk_t *ttrunk,
                                     char const *base_dn, int scope, char const *filter, char const * const *attrs,
                                     LDAPControl **serverctrls, LDAPControl **clientctrls);
 
unlang_action_t fr_ldap_trunk_modify(TALLOC_CTX *ctx,
                                     fr_ldap_query_t **out, request_t *request, fr_ldap_thread_trunk_t *ttrunk,
                                     char const *dn, LDAPMod *mods[],
                                     LDAPControl **serverctrls, LDAPControl **clientctrls);
 
unlang_action_t fr_ldap_trunk_extended(TALLOC_CTX *ctx,
                                       fr_ldap_query_t **out, request_t *request, fr_ldap_thread_trunk_t *ttrunk,
                                       char const *reqoid, struct berval *reqdata,
                                       LDAPControl **serverctrls, LDAPControl **clientctrls);
 
/*
 *      base.c - Wrappers arounds OpenLDAP functions.
 */
void            fr_ldap_timeout_debug(request_t *request, fr_ldap_connection_t const *conn,
                                      fr_time_delta_t timeout, char const *prefix);
 
size_t          fr_ldap_uri_escape_func(UNUSED request_t *request, char *out, size_t outlen, char const *in, UNUSED void *arg)
                CC_HINT(nonnull(2,4));
 
size_t          fr_ldap_uri_unescape_func(UNUSED request_t *request, char *out, size_t outlen, char const *in, UNUSED void *arg)
                CC_HINT(nonnull(2,4));
 
char const      *fr_ldap_error_str(fr_ldap_connection_t const *conn);
 
fr_ldap_rcode_t fr_ldap_search_async(int *msgid, request_t *request,
                                     fr_ldap_connection_t *pconn,
                                     char const *dn, int scope, char const *filter, char const * const *attrs,
                                     LDAPControl **serverctrls, LDAPControl **clientctrls);
 
fr_ldap_rcode_t fr_ldap_modify_async(int *msgid, request_t *request, fr_ldap_connection_t *pconn,
                               char const *dn, LDAPMod *mods[],
                               LDAPControl **serverctrls, LDAPControl **clientctrls);
 
fr_ldap_rcode_t fr_ldap_extended_async(int *msgid, request_t *request, fr_ldap_connection_t *pconn,
                                       char const *reqiod, struct berval *reqdata);
 
fr_ldap_rcode_t fr_ldap_error_check(LDAPControl ***ctrls, fr_ldap_connection_t const *conn,
                                    LDAPMessage *msg, char const *dn);
 
fr_ldap_rcode_t fr_ldap_result(LDAPMessage **result, LDAPControl ***ctrls,
                               fr_ldap_connection_t const *conn, int msgid, int all,
                               char const *dn,
                               fr_time_delta_t timeout);
 
LDAP            *fr_ldap_handle_thread_local(void);
 
int             fr_ldap_global_config(int debug_level, char const *tls_random_file);
 
int             fr_ldap_init(void);
 
void            fr_ldap_free(void);
 
/*
 *      control.c - Connection based client/server controls
 */
void            fr_ldap_control_merge(LDAPControl *serverctrls_out[],
                                      LDAPControl *clientctrls_out[],
                                      size_t serverctrls_len,
                                      size_t clientctrls_len,
                                      fr_ldap_connection_t *conn,
                                      LDAPControl *serverctrls_in[],
                                      LDAPControl *clientctrls_in[]);
 
int             fr_ldap_control_add_server(fr_ldap_connection_t *conn, LDAPControl *ctrl, bool freeit);
 
int             fr_ldap_control_add_client(fr_ldap_connection_t *conn, LDAPControl *ctrl, bool freeit);
 
void            fr_ldap_control_clear(fr_ldap_connection_t *conn);
 
int             fr_ldap_control_add_session_tracking(fr_ldap_connection_t *conn, request_t *request);
 
/*
 *      directory.c - Get directory capabilities from the remote server
 */
#define LDAP_DIRECTORY_ATTRS { "vendorname", \
                               "vendorversion", \
                               "isGlobalCatalogReady", \
                               "objectClass", \
                               "orcldirectoryversion", \
                               "supportedControl", \
                               "namingContexts", \
                               NULL }
 
int             fr_ldap_directory_result_parse(fr_ldap_directory_t *directory, LDAP *handle,
                                               LDAPMessage *result, char const *name);
 
int             fr_ldap_trunk_directory_alloc_async(TALLOC_CTX *ctx, fr_ldap_thread_trunk_t *ttrunk);
 
int             fr_ldap_conn_directory_alloc_async(fr_ldap_connection_t *ldap_conn);
 
/*
 *      edir.c - Edirectory integrations
 */
unlang_action_t fr_ldap_edir_get_password(request_t *request, char const *dn,
                                          fr_ldap_thread_trunk_t *ttrunk, fr_dict_attr_t const *password_da);
 
char const      *fr_ldap_edir_errstr(int code);
 
 
/*
 *      map.c - Attribute mapping code.
 */
int             fr_ldap_map_getvalue(TALLOC_CTX *ctx, fr_pair_list_t *out, request_t *request,
                                     map_t const *map, void *uctx);
 
int             fr_ldap_map_verify(map_t *map, void *instance);
 
int             fr_ldap_map_expand(TALLOC_CTX *ctx, fr_ldap_map_exp_t *expanded, request_t *request, map_list_t const *maps, char const *generic_attr);
 
int             fr_ldap_map_do(request_t *request,
                               char const *valuepair_attr, fr_ldap_map_exp_t const *expanded, LDAPMessage *entry);
 
/*
 *      connection.c - Connection configuration functions
 */
fr_ldap_connection_t *fr_ldap_connection_alloc(TALLOC_CTX *ctx);
 
fr_connection_t *fr_ldap_connection_state_alloc(TALLOC_CTX *ctx, fr_event_list_t *el,
                                                fr_ldap_config_t const *config, char const *log_prefix);
 
int             fr_ldap_connection_configure(fr_ldap_connection_t *c, fr_ldap_config_t const *config);
 
int             fr_ldap_connection_timeout_set(fr_ldap_connection_t const *conn, fr_time_delta_t timeout);
 
int             fr_ldap_connection_timeout_reset(fr_ldap_connection_t const *conn);
 
fr_ldap_thread_trunk_t  *fr_thread_ldap_trunk_get(fr_ldap_thread_t *thread, char const *uri,
                                               char const *bind_dn, char const *bind_password,
                                               request_t *request, fr_ldap_config_t const *config);
 
fr_trunk_state_t fr_thread_ldap_trunk_state(fr_ldap_thread_t *thread, char const *uri, char const *bind_dn);
 
fr_ldap_thread_trunk_t  *fr_thread_ldap_bind_trunk_get(fr_ldap_thread_t *thread);
 
/*
 *      state.c - Connection state machine
 */
fr_ldap_state_t fr_ldap_state_next(fr_ldap_connection_t *c);
 
void            fr_ldap_state_error(fr_ldap_connection_t *c);
 
/*
 *      start_tls.c - Mostly async start_tls
 */
int             fr_ldap_start_tls_async(fr_ldap_connection_t *c,
                                        LDAPControl **serverctrls, LDAPControl **clientctrls);
 
/*
 *      sasl.c - Async sasl bind
 */
#ifdef WITH_SASL
int             fr_ldap_sasl_bind_async(fr_ldap_connection_t *c,
                                        char const *mechs,
                                        char const *identity,
                                        char const *password,
                                        char const *proxy,
                                        char const *realm,
                                        LDAPControl **serverctrls, LDAPControl **clientctrls);
 
int             fr_ldap_sasl_bind_auth_send(fr_ldap_sasl_ctx_t *sasl_ctx,
                                            int *msgid,
                                            fr_ldap_connection_t *ldap_conn);
 
unlang_action_t fr_ldap_sasl_bind_auth_async(request_t *request,
                                             fr_ldap_thread_t *thread,
                                             char const *mechs,
                                             char const *identity,
                                             char const *password,
                                             char const *proxy, char const *realm);
#endif
 
/*
 *      bind.c - Async bind
 */
int             fr_ldap_bind_async(fr_ldap_connection_t *c,
                                   char const *bind_dn, char const *password,
                                   LDAPControl **serverctrls, LDAPControl **clientctrls);
 
unlang_action_t fr_ldap_bind_auth_async(request_t *request, fr_ldap_thread_t *thread,
                                        char const *bind_dn, char const *password);
 
/*
 *      uti.c - Utility functions
 */
size_t          fr_ldap_common_dn(char const *full, char const *part);
 
bool            fr_ldap_util_is_dn(char const *in, size_t inlen);
 
size_t          fr_ldap_util_normalise_dn(char *out, char const *in);
 
char            *fr_ldap_berval_to_string(TALLOC_CTX *ctx, struct berval const *in);
 
uint8_t         *fr_ldap_berval_to_bin(TALLOC_CTX *ctx, struct berval const *in);
 
int             fr_ldap_parse_url_extensions(LDAPControl **sss, size_t sss_len, char *extensions[]);
 
int             fr_ldap_attrs_check(char const **attrs, char const *attr);
 
int             fr_ldap_server_url_check(fr_ldap_config_t *handle_config, char const *server, CONF_SECTION const *cs);
 
int             fr_ldap_server_config_check(fr_ldap_config_t *handle_config, char const *server, CONF_SECTION *cs);
 
char const      *fr_ldap_url_err_to_str(int ldap_url_err);
 
int             fr_ldap_box_escape(fr_value_box_t *vb, UNUSED void *uctx);
 
int             fr_ldap_filter_to_tmpl(TALLOC_CTX *ctx, tmpl_rules_t const *t_rules, char const **sub, size_t sublen,
                                       tmpl_t **out) CC_HINT(nonnull());
 
/*
 *      referral.c - Handle LDAP referrals
 */
fr_ldap_referral_t      *fr_ldap_referral_alloc(TALLOC_CTX *ctx, request_t *request);
 
int             fr_ldap_referral_follow(fr_ldap_thread_t *thread, request_t *request, fr_ldap_query_t *query);
 
int             fr_ldap_referral_next(fr_ldap_thread_t *thread, request_t *request, fr_ldap_query_t *query);
 
/*
 *      filter.c - Basic filter parsing and filtering
 */
typedef int     (*filter_attr_check_t)(char const *attr, void *uctx);
 
fr_slen_t       fr_ldap_filter_parse(TALLOC_CTX *ctx, fr_dlist_head_t **root, fr_sbuff_t *filter,
                filter_attr_check_t attr_check, void *uctx);
 
bool            fr_ldap_filter_eval(fr_dlist_head_t *root, fr_ldap_connection_t *conn, LDAPMessage *msg);