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Diffstat (limited to 'src/modules/rlm_ldap/ldap.h')
| -rw-r--r-- | src/modules/rlm_ldap/ldap.h | 489 |
1 files changed, 489 insertions, 0 deletions
diff --git a/src/modules/rlm_ldap/ldap.h b/src/modules/rlm_ldap/ldap.h new file mode 100644 index 0000000..e2e628d --- /dev/null +++ b/src/modules/rlm_ldap/ldap.h @@ -0,0 +1,489 @@ +/** + * $Id$ + * @file ldap.h + * @brief LDAP authorization and authentication module headers. + * + * @author Arran Cudbard-Bell <a.cudbardb@freeradius.org> + * @copyright 2015 Arran Cudbard-Bell <a.cudbardb@freeradius.org> + * @copyright 2013 Network RADIUS SARL<info@networkradius.com> + * @copyright 2013-2015 The FreeRADIUS Server Project. + */ +#ifndef _RLM_LDAP_H +#define _RLM_LDAP_H + +#include <freeradius-devel/radiusd.h> +#include <freeradius-devel/modules.h> + +/* + * We're mostly using the new API now, but ldap_bind + * is in the list of deprecated functions, at we may + * always need to support that. + */ +#define LDAP_DEPRECATED 1 +USES_APPLE_DEPRECATED_API /* Apple wants us to use OpenDirectory Framework, we don't want that */ +#include <lber.h> +#include <ldap.h> +#include "config.h" + +/* + * Ensure the have the ldap_create_sort_keylist() + * function too, else we can't use ldap_create_sort_control() + */ +#if !defined(LDAP_CREATE_SORT_KEYLIST) || !defined(LDAP_FREE_SORT_KEYLIST) +# undef HAVE_LDAP_CREATE_SORT_CONTROL +#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. + */ +#if !defined(LDAP_VENDOR_VERSION_PATCH) || LDAP_VENDOR_VERSION_PATCH == 0 +# undef LDAP_VENDOR_VERSION_PATCH +# define LDAP_VENDOR_VERSION_PATCH 0 +#endif + +/* + * 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 + +#if defined(HAVE_LDAP_URL_PARSE) && defined(HAVE_LDAP_IS_LDAP_URL) && defined(HAVE_LDAP_URL_DESC2STR) +# define LDAP_CAN_PARSE_URLS +#endif + +#define MOD_PREFIX "rlm_ldap" //!< The name of the module. + +#define LDAP_MAX_ATTRMAP 128 //!< Maximum number of mappings between LDAP and + //!< FreeRADIUS attributes. +#define LDAP_MAP_RESERVED 4 //!< Number of additional items to allocate in expanded + //!< attribute name arrays. Currently for enable attribute, + //!< group membership attribute, valuepair attribute, + //!< and profile 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. + +#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. + +typedef struct ldap_acct_section { + CONF_SECTION *cs; //!< Section configuration. + + char const *reference; //!< Configuration reference string. +} ldap_acct_section_t; + +typedef struct ldap_sasl { + char const *mech; //!< SASL mech(s) to try. + char const *proxy; //!< Identity to proxy. + char const *realm; //!< Kerberos realm. +} ldap_sasl; + +typedef struct ldap_sasl_dynamic { + vp_tmpl_t *mech; //!< SASL mech(s) to try. + vp_tmpl_t *proxy; //!< Identity to proxy. + vp_tmpl_t *realm; //!< Kerberos realm. +} ldap_sasl_dynamic; + +typedef struct ldap_instance { + CONF_SECTION *cs; //!< Main configuration section for this instance. + fr_connection_pool_t *pool; //!< Connection pool instance. + + char const *config_server; //!< Server set in the config. + char *server; //!< Initial server to bind to. + 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. + + ldap_sasl admin_sasl; //!< SASL parameters used when binding as the admin. + + const char *sasl_secprops; //!< SASL Security Properties to set. + + char const *dereference_str; //!< When to dereference (never, searching, finding, always) + int dereference; //!< libldap value specifying dereferencing behaviour. + + 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 rebind; //!< Controls whether we set an ldad_rebind_proc function + //!< and so determines if we can bind to other servers whilst + //!< chasing referrals. If this is false, we will still chase + //!< referrals on the same server, but won't bind to other + //!< servers. + + uint32_t ldap_debug; //!< Debug flag for the SDK. + + char const *name; //!< Instance name. + + bool expect_password; //!< True if the user_map included a mapping between an LDAP + //!< attribute and one of our password reference attributes. + + /* + * RADIUS attribute to LDAP attribute maps + */ + vp_map_t *user_map; //!< Attribute map applied to users and profiles. + + /* + * User object attributes and filters + */ + vp_tmpl_t *userobj_filter; //!< Filter to retrieve only user objects. + vp_tmpl_t *userobj_base_dn; //!< DN to search for users under. + char const *userobj_scope_str; //!< Scope (sub, one, base). + char const *userobj_sort_by; //!< List of attributes to sort by. + LDAPControl *userobj_sort_ctrl; //!< Server side sort control. + + int userobj_scope; //!< Search scope. + + char const *user_dn; //!< for multiple LDAP modules + DICT_ATTR const *user_dn_da; //!< cached user DN + + char const *userobj_membership_attr; //!< Attribute that describes groups the user is a member of. + char const *userobj_access_attr; //!< Attribute to check to see if the user should be locked out. + bool access_positive; //!< If true the presence of the attribute will allow access, + //!< else it will deny access. + + char const *valuepair_attr; //!< Generic dynamic mapping attribute, contains a RADIUS + //!< attribute and value. + + ldap_sasl_dynamic user_sasl; //!< SASL parameters used when binding as the user. + + /* + * Group object attributes and filters + */ + char const *groupobj_filter; //!< Filter to retrieve only group objects. + vp_tmpl_t *groupobj_base_dn; //!< DN to search for users under. + char const *groupobj_scope_str; //!< Scope (sub, one, base). + int groupobj_scope; //!< Search scope. + + char const *groupobj_name_attr; //!< The name of the group. + char const *groupobj_membership_filter; //!< Filter to only retrieve groups which contain + //!< the user as a member. + + bool cacheable_group_name; //!< If true the server will determine complete set of group + //!< memberships for the current user object, and perform any + //!< resolution necessary to determine the names of those + //!< groups, then right them to the control list (LDAP-Group). + + bool cacheable_group_dn; //!< If true the server will determine complete set of group + //!< memberships for the current user object, and perform any + //!< resolution necessary to determine the DNs of those groups, + //!< then right them to the control list (LDAP-GroupDN). + + char const *cache_attribute; //!< Sets the attribute we use when creating and retrieving + //!< cached group memberships. + + DICT_ATTR const *cache_da; //!< The DA associated with this specific instance of the + //!< rlm_ldap module. + + DICT_ATTR const *group_da; //!< The DA associated with this specific instance of the + //!< rlm_ldap module. + + bool allow_dangling_group_refs; //!< Don't error if we fail to resolve a group DN referenced + ///< from a user object. + + + /* + * Dynamic clients + */ + char const *clientobj_filter; //!< Filter to retrieve only client objects. + char const *clientobj_base_dn; //!< DN to search for clients under. + char const *clientobj_scope_str; //!< Scope (sub, one, base). + int clientobj_scope; //!< Search scope. + + bool do_clients; //!< If true, attempt to load clients on instantiation. + + /* + * Profiles + */ + vp_tmpl_t *default_profile; //!< If this is set, we will search for a profile object + //!< with this name, and map any attributes it contains. + //!< No value should be set if profiles are not being used + //!< as there is an associated performance penalty. + char const *profile_attr; //!< Attribute that identifies profiles to apply. May appear + //!< in userobj or groupobj. + vp_tmpl_t *profile_filter; //!< Filter to retrieve only retrieve group objects. + + /* + * Accounting + */ + ldap_acct_section_t *postauth; //!< Modify mappings for post-auth. + ldap_acct_section_t *accounting; //!< Modify mappings for accounting. + + /* + * TLS items. We should really normalize these with the + * TLS code in 3.0. + */ + 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_random_file; //!< Path to the random file if /dev/random and /dev/urandom + //!< are unavailable. + + 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. + + bool tls_check_crl; //!< whether we do CRL checks or not + + char const *tls_min_version_str; //!< Minimum TLS version + int tls_min_version; + + char const *tls_cipher_list; //!< cipher suites + + /* + * Options + */ + uint32_t net_timeout; //!< How long we wait for new connections to the LDAP server + //!< to be established. + uint32_t res_timeout; //!< How long we wait for a result from the server. + uint32_t srv_timelimit; //!< How long the server should spent on a single request + //!< (also bounded by value on the server). + +#ifdef WITH_EDIR + /* + * eDir support + */ + bool edir; //!< If true attempt to retrieve the user's cleartext password + //!< using the Universal Password feature of Novell eDirectory. + bool edir_autz; //!< If true, and we have the Universal Password, bind with it + //!< to perform additional authorisation checks. +#endif + /* + * For keep-alives. + */ +#ifdef LDAP_OPT_X_KEEPALIVE_IDLE + uint32_t keepalive_idle; //!< Number of seconds a connections needs to remain idle + //!< before TCP starts sending keepalive probes. +#endif +#ifdef LDAP_OPT_X_KEEPALIVE_PROBES + uint32_t keepalive_probes; //!< Number of missed timeouts before the connection is + //!< dropped. +#endif +#ifdef LDAP_OPT_X_KEEPALIVE_INTERVAL + uint32_t keepalive_interval; //!< Interval between keepalive probes. +#endif + + LDAP *handle; //!< Hack for OpenLDAP libldap global initialisation. +} rlm_ldap_t; + +/** Tracks the state of a libldap connection handle + * + */ +typedef struct ldap_handle { + LDAP *handle; //!< libldap handle. + bool rebound; //!< Whether the connection has been rebound to something + //!< other than the admin user. + rlm_ldap_t *inst; //!< rlm_ldap configuration. +} ldap_handle_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 rlm_ldap_map_exp { + vp_map_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. +} rlm_ldap_map_exp_t; + +/** Contains a collection of values + * + */ +typedef struct rlm_ldap_result { + struct berval **values; //!< libldap struct containing bv_val (char *) + //!< and length bv_len. + int count; //!< Number of values. +} rlm_ldap_result_t; + +/** Codes returned by rlm_ldap internal functions + * + */ +typedef enum { + LDAP_PROC_CONTINUE = 1, //!< Operation is in progress. + LDAP_PROC_SUCCESS = 0, //!< Operation was successfull. + + LDAP_PROC_ERROR = -1, //!< Unrecoverable library/server error. + + LDAP_PROC_RETRY = -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_rcode_t; + +/* + * Some functions may be called with a NULL request structure, this + * simplifies switching certain messages from the request log to + * the main log. + */ +#define LDAP_INFO(fmt, ...) INFO("rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) +#define LDAP_WARN(fmt, ...) WARN("rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) + +#define LDAP_DBGW(fmt, ...) radlog(L_DBG_WARN, "rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) +#define LDAP_DBGW_REQ(fmt, ...) do { if (request) {RWDEBUG(fmt, ##__VA_ARGS__);} else {LDAP_DBGW(fmt, ##__VA_ARGS__);}} while (0) + +#define LDAP_DBG(fmt, ...) radlog(L_DBG, "rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) +#define LDAP_DBG_REQ(fmt, ...) do { if (request) {RDEBUG(fmt, ##__VA_ARGS__);} else {LDAP_DBG(fmt, ##__VA_ARGS__);}} while (0) + +#define LDAP_DBG2(fmt, ...) if (rad_debug_lvl >= L_DBG_LVL_2) radlog(L_DBG, "rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) +#define LDAP_DBG_REQ2(fmt, ...) do { if (request) {RDEBUG2(fmt, ##__VA_ARGS__);} else if (rad_debug_lvl >= L_DBG_LVL_2) {LDAP_DBG(fmt, ##__VA_ARGS__);}} while (0) + +#define LDAP_DBG3(fmt, ...) if (rad_debug_lvl >= L_DBG_LVL_3) radlog(L_DBG, "rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) +#define LDAP_DBG_REQ3(fmt, ...) do { if (request) {RDEBUG3(fmt, ##__VA_ARGS__);} else if (rad_debug_lvl >= L_DBG_LVL_3) {LDAP_DBG(fmt, ##__VA_ARGS__);}} while (0) + +#define LDAP_ERR(fmt, ...) ERROR("rlm_ldap (%s): " fmt, inst->name, ##__VA_ARGS__) +#define LDAP_ERR_REQ(fmt, ...) do { if (request) {REDEBUG(fmt, ##__VA_ARGS__);} else {LDAP_ERR(fmt, ##__VA_ARGS__);}} while (0) + +#define LDAP_EXT() if (extra) LDAP_ERR(extra) +#define LDAP_EXT_REQ() do { if (extra) { if (request) REDEBUG("%s", extra); else LDAP_ERR("%s", extra); }} while (0) + +extern FR_NAME_NUMBER const ldap_scope[]; +extern FR_NAME_NUMBER const ldap_tls_require_cert[]; + +/* + * ldap.c - Wrappers arounds OpenLDAP functions. + */ +size_t rlm_ldap_escape_func(UNUSED REQUEST *request, char *out, size_t outlen, char const *in, UNUSED void *arg); + +bool rlm_ldap_is_dn(char const *in, size_t inlen); + +size_t rlm_ldap_normalise_dn(char *out, char const *in); + +ssize_t rlm_ldap_xlat_filter(REQUEST *request, char const **sub, size_t sublen, char *out, size_t outlen); + +ldap_rcode_t rlm_ldap_bind(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn, char const *dn, + char const *password, ldap_sasl *sasl, bool retry); + +char const *rlm_ldap_error_str(ldap_handle_t const *conn); + +ldap_rcode_t rlm_ldap_search(LDAPMessage **result, rlm_ldap_t const *inst, REQUEST *request, + ldap_handle_t **pconn, + char const *dn, int scope, char const *filter, char const * const *attrs, + LDAPControl **serverctrls, LDAPControl **clientctrls); + +ldap_rcode_t rlm_ldap_modify(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn, + char const *dn, LDAPMod *mods[]); + +char const *rlm_ldap_find_user(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn, + char const *attrs[], bool force, LDAPMessage **result, rlm_rcode_t *rcode); + +rlm_rcode_t rlm_ldap_check_access(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t const *conn, + LDAPMessage *entry); + +void rlm_ldap_check_reply(rlm_ldap_t const *inst, REQUEST *request); + +/* + * ldap.c - Callbacks for the connection pool API. + */ +ldap_rcode_t rlm_ldap_result(rlm_ldap_t const *inst, ldap_handle_t const *conn, int msgid, char const *dn, + LDAPMessage **result, char const **error, char **extra); + +char *rlm_ldap_berval_to_string(TALLOC_CTX *ctx, struct berval const *in); + +int rlm_ldap_global_init(rlm_ldap_t *inst) CC_HINT(nonnull); + +void *mod_conn_create(TALLOC_CTX *ctx, void *instance); + +ldap_handle_t *mod_conn_get(rlm_ldap_t const *inst, REQUEST *request); + +void mod_conn_release(rlm_ldap_t const *inst, ldap_handle_t *conn); + +/* + * groups.c - Group membership functions. + */ +rlm_rcode_t rlm_ldap_cacheable_userobj(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn, + LDAPMessage *entry, char const *attr); + +rlm_rcode_t rlm_ldap_cacheable_groupobj(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn); + +rlm_rcode_t rlm_ldap_check_groupobj_dynamic(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn, + VALUE_PAIR *check); + +rlm_rcode_t rlm_ldap_check_userobj_dynamic(rlm_ldap_t const *inst, REQUEST *request, ldap_handle_t **pconn, + char const *dn, VALUE_PAIR *check); + +rlm_rcode_t rlm_ldap_check_cached(rlm_ldap_t const *inst, REQUEST *request, VALUE_PAIR *check); + +/* + * attrmap.c - Attribute mapping code. + */ +int rlm_ldap_map_getvalue(TALLOC_CTX *ctx, VALUE_PAIR **out, REQUEST *request, vp_map_t const *map, void *uctx); + +int rlm_ldap_map_verify(vp_map_t *map, void *instance); + +int rlm_ldap_map_expand(rlm_ldap_map_exp_t *expanded, REQUEST *request, vp_map_t const *maps); + +int rlm_ldap_map_do(rlm_ldap_t const *inst, REQUEST *request, LDAP *handle, + rlm_ldap_map_exp_t const *expanded, LDAPMessage *entry); + +/* + * clients.c - Dynamic clients (bulk load). + */ +int rlm_ldap_client_load(rlm_ldap_t const *inst, CONF_SECTION *tmpl, CONF_SECTION *cs); + +/* + * edir.c - Magic extensions for Novell + */ +int nmasldap_get_password(LDAP *ld, char const *dn, char *password, size_t *len); + +char const *edir_errstr(int code); + +/* + * sasl.s - SASL bind functions + */ +ldap_rcode_t rlm_ldap_sasl_interactive(rlm_ldap_t const *inst, REQUEST *request, + ldap_handle_t *pconn, char const *dn, + char const *password, ldap_sasl *sasl, + char const **error, char **error_extra); +#endif |