groups.c

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/*
 *   This program is is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or (at
 *   your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
 */
 
/**
 * $Id: b7a83b79aeb2bf1d4c92e4c3ad2ce971ee59f56f $
 * @file groups.c
 * @brief LDAP module group functions.
 *
 * @author Arran Cudbard-Bell (a.cudbardb@freeradius.org)
 *
 * @copyright 2013 Network RADIUS SAS (legal@networkradius.com)
 * @copyright 2013-2015 The FreeRADIUS Server Project.
 */
RCSID("$Id: b7a83b79aeb2bf1d4c92e4c3ad2ce971ee59f56f $")
 
USES_APPLE_DEPRECATED_API
 
#include <freeradius-devel/util/debug.h>
 
#define LOG_PREFIX "rlm_ldap groups"
 
#include "rlm_ldap.h"
 
static char const *null_attrs[] = { NULL };
 
/** Context to use when resolving group membership from the user object.
 *
 */
typedef struct {
        rlm_ldap_t const        *inst;                                  //!< Module instance.
        fr_value_box_t          *base_dn;                               //!< The base DN to search for groups in.
        fr_ldap_thread_trunk_t  *ttrunk;                                //!< Trunk on which to perform additional queries.
        fr_pair_list_t          groups;                                 //!< Temporary list to hold pairs.
        TALLOC_CTX              *list_ctx;                              //!< In which to allocate pairs.
        char                    *group_name[LDAP_MAX_CACHEABLE + 1];    //!< List of group names which need resolving.
        unsigned int            name_cnt;                               //!< How many names need resolving.
        char                    *group_dn[LDAP_MAX_CACHEABLE + 1];      //!< List of group DNs which need resolving.
        char                    **dn;                                   //!< Current DN being resolved.
        char const              *attrs[2];                              //!< For resolving name from DN.
        fr_ldap_query_t         *query;                                 //!< Current query performing group resolution.
} ldap_group_userobj_ctx_t;
 
/** Context to use when looking up group membership using group objects.
 *
 */
typedef struct {
        rlm_ldap_t const        *inst;                                  //!< Module instance.
        fr_value_box_t          *base_dn;                               //!< The base DN to search for groups in.
        fr_ldap_thread_trunk_t  *ttrunk;                                //!< Trunk on which to perform additional queries.
        tmpl_t                  *filter_tmpl;                           //!< Tmpl to expand into LDAP filter.
        fr_value_box_list_t     expanded_filter;                        //!< Values produced by expanding filter xlat.
        char const              *attrs[2];                              //!< For retrieving the group name.
        fr_ldap_query_t         *query;                                 //!< Current query performing group lookup.
        void                    *uctx;                                  //!< Optional context for use in results parsing.
} ldap_group_groupobj_ctx_t;
 
/** Context to use when evaluating group membership from the user object in an xlat
 *
 */
typedef struct {
        ldap_memberof_xlat_ctx_t        *xlat_ctx;              //!< Xlat context being evaluated.
        char const                      *attrs[2];              //!< For retrieving the group name.
        struct berval                   **values;               //!< Values of the membership attribute to check.
        int                             count;                  //!< How many entries there are in values.
        int                             value_no;               //!< The current entry in values being processed.
        char const                      *lookup_dn;             //!< The DN currently being looked up, when resolving DN to name.
        char                            *group_name;            //!< Result of resolving the provided group DN as to a name.
        fr_ldap_query_t                 *query;                 //!< Current query doing a DN to name resolution.
        bool                            resolving_value;        //!< Is the current query resolving a DN from values.
} ldap_group_userobj_dyn_ctx_t;
 
/** Cancel a pending group lookup query
 *
 */
static void ldap_group_userobj_cancel(UNUSED request_t *request, UNUSED fr_signal_t action, void *uctx)
{
        ldap_group_userobj_ctx_t        *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_ctx_t);
 
        /*
         *      If the query is not in flight, just return.
         */
        if (!group_ctx->query || !(group_ctx->query->treq)) return;
 
        fr_trunk_request_signal_cancel(group_ctx->query->treq);
}
 
/** Convert multiple group names into a DNs
 *
 * Given an array of group names, builds a filter matching all names, then retrieves all group objects
 * and stores the DN associated with each group object.
 *
 * @param[out] p_result         The result of trying to resolve a group name to a dn.
 * @param[out] priority         Unused
 * @param[in] request           Current request.
 * @param[in] uctx              Group lookup context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_group_name2dn_start(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                void *uctx)
{
        ldap_group_userobj_ctx_t        *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_ctx_t);
        rlm_ldap_t const                *inst = group_ctx->inst;
        char                            **name = group_ctx->group_name;
        char                            buffer[LDAP_MAX_GROUP_NAME_LEN + 1];
        char                            *filter;
 
        if (!inst->group.obj_name_attr) {
                REDEBUG("Told to convert group names to DNs but missing 'group.name_attribute' directive");
                RETURN_MODULE_INVALID;
        }
        if (group_ctx->base_dn->type != FR_TYPE_STRING) {
                REDEBUG("Missing group base_dn");
                RETURN_MODULE_INVALID;
        }
 
        RDEBUG2("Converting group name(s) to group DN(s)");
 
        /*
         *      It'll probably only save a few ms in network latency, but it means we can send a query
         *      for the entire group list at once.
         */
        filter = talloc_typed_asprintf(group_ctx, "%s%s%s",
                                 inst->group.obj_filter ? "(&" : "",
                                 inst->group.obj_filter ? inst->group.obj_filter : "",
                                 group_ctx->group_name[0] && group_ctx->group_name[1] ? "(|" : "");
        while (*name) {
                fr_ldap_uri_escape_func(request, buffer, sizeof(buffer), *name++, NULL);
                filter = talloc_asprintf_append_buffer(filter, "(%s=%s)", inst->group.obj_name_attr, buffer);
 
                group_ctx->name_cnt++;
        }
        filter = talloc_asprintf_append_buffer(filter, "%s%s",
                                               inst->group.obj_filter ? ")" : "",
                                               group_ctx->group_name[0] && group_ctx->group_name[1] ? ")" : "");
 
        return fr_ldap_trunk_search(group_ctx, &group_ctx->query, request, group_ctx->ttrunk,
                                    group_ctx->base_dn->vb_strvalue, inst->group.obj_scope, filter,
                                    null_attrs, NULL, NULL);
}
 
/** Process the results of looking up group DNs from names
 *
 * @param[out] p_result         The result of trying to resolve a group name to a dn.
 * @param[out] priority         Unused
 * @param[in] request           Current request.
 * @param[in] uctx              Group lookup context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_group_name2dn_resume(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                void *uctx)
{
        ldap_group_userobj_ctx_t        *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_ctx_t);
        fr_ldap_query_t                 *query = talloc_get_type_abort(group_ctx->query, fr_ldap_query_t);
        rlm_ldap_t const                *inst = group_ctx->inst;
        rlm_rcode_t                     rcode = RLM_MODULE_OK;
        unsigned int                    entry_cnt;
        LDAPMessage                     *entry;
        int                             ldap_errno;
        char                            *dn;
        fr_pair_t                       *vp;
 
        switch (query->ret) {
        case LDAP_RESULT_SUCCESS:
                break;
 
        case LDAP_RESULT_NO_RESULT:
        case LDAP_RESULT_BAD_DN:
                RDEBUG2("Tried to resolve group name(s) to DNs but got no results");
                goto finish;
 
        default:
                rcode = RLM_MODULE_FAIL;
                goto finish;
        }
 
        entry_cnt = ldap_count_entries(query->ldap_conn->handle, query->result);
        if (entry_cnt > group_ctx->name_cnt) {
                REDEBUG("Number of DNs exceeds number of names, group and/or dn should be more restrictive");
                rcode = RLM_MODULE_INVALID;
 
                goto finish;
        }
 
        if (entry_cnt < group_ctx->name_cnt) {
                RWDEBUG("Got partial mapping of group names (%i) to DNs (%i), membership information may be incomplete",
                        group_ctx->name_cnt, entry_cnt);
        }
 
        entry = ldap_first_entry(query->ldap_conn->handle, query->result);
        if (!entry) {
                ldap_get_option(query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
 
                rcode = RLM_MODULE_FAIL;
                goto finish;
        }
 
        do {
                dn = ldap_get_dn(query->ldap_conn->handle, entry);
                if (!dn) {
                        ldap_get_option(query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                        REDEBUG("Retrieving object DN from entry failed: %s", ldap_err2string(ldap_errno));
 
                        rcode = RLM_MODULE_FAIL;
                        goto finish;
                }
                fr_ldap_util_normalise_dn(dn, dn);
 
                RDEBUG2("Got group DN \"%s\"", dn);
                MEM(vp = fr_pair_afrom_da(group_ctx->list_ctx, inst->group.cache_da));
                fr_pair_value_bstrndup(vp, dn, strlen(dn), true);
                fr_pair_append(&group_ctx->groups, vp);
                ldap_memfree(dn);
        } while((entry = ldap_next_entry(query->ldap_conn->handle, entry)));
 
finish:
        /*
         *      Remove pointer to group name to resolve so we don't
         *      try to do it again
         */
        *group_ctx->group_name = NULL;
        talloc_free(group_ctx->query);
 
        RETURN_MODULE_RCODE(rcode);
}
 
/** Initiate an LDAP search to turn a group DN into it's name
 *
 * Unlike the inverse conversion of a name to a DN, most LDAP directories don't allow filtering by DN,
 * so we need to search for each DN individually.
 *
 * @param[out] p_result         The result of trying to resolve a dn to a group name.
 * @param[in] priority          unused.
 * @param[in] request           Current request.
 * @param[in] uctx              The group resolution context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_group_dn2name_start(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                void *uctx)
{
        ldap_group_userobj_ctx_t        *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_ctx_t);
        rlm_ldap_t const                *inst = group_ctx->inst;
 
        if (!inst->group.obj_name_attr) {
                REDEBUG("Told to resolve group DN to name but missing 'group.name_attribute' directive");
                RETURN_MODULE_INVALID;
        }
 
        RDEBUG2("Resolving group DN \"%s\" to group name", *group_ctx->dn);
 
        return fr_ldap_trunk_search(group_ctx, &group_ctx->query, request, group_ctx->ttrunk, *group_ctx->dn,
                                    LDAP_SCOPE_BASE, NULL, group_ctx->attrs, NULL, NULL);
}
 
/** Process the results of a group DN -> name lookup.
 *
 * The retrieved value is added as a value pair to the
 * temporary list in the group resolution context.
 *
 * @param[out] p_result         The result of trying to resolve a dn to a group name.
 * @param[in] priority          unused.
 * @param[in] request           Current request.
 * @param[in] uctx              The group resolution context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_group_dn2name_resume(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                 void *uctx)
{
        ldap_group_userobj_ctx_t        *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_ctx_t);
        fr_ldap_query_t                 *query = talloc_get_type_abort(group_ctx->query, fr_ldap_query_t);
        rlm_ldap_t const                *inst = group_ctx->inst;
        LDAPMessage                     *entry;
        struct berval                   **values = NULL;
        int                             ldap_errno;
        rlm_rcode_t                     rcode = RLM_MODULE_OK;
        fr_pair_t                       *vp;
 
        switch (query->ret) {
        case LDAP_RESULT_SUCCESS:
                break;
 
        case LDAP_RESULT_NO_RESULT:
        case LDAP_RESULT_BAD_DN:
                REDEBUG("Group DN \"%s\" did not resolve to an object", *group_ctx->dn);
                rcode = (inst->group.allow_dangling_refs ? RLM_MODULE_NOOP : RLM_MODULE_INVALID);
                goto finish;
 
        default:
                rcode = RLM_MODULE_FAIL;
                goto finish;
        }
 
        entry = ldap_first_entry(query->ldap_conn->handle, query->result);
        if (!entry) {
                ldap_get_option(query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
                rcode = RLM_MODULE_INVALID;
                goto finish;
        }
 
        values = ldap_get_values_len(query->ldap_conn->handle, entry, inst->group.obj_name_attr);
        if (!values) {
                REDEBUG("No %s attributes found in object", inst->group.obj_name_attr);
                rcode = RLM_MODULE_INVALID;
                goto finish;
        }
 
        MEM(vp = fr_pair_afrom_da(group_ctx->list_ctx, inst->group.cache_da));
        fr_pair_value_bstrndup(vp, values[0]->bv_val, values[0]->bv_len, true);
        fr_pair_append(&group_ctx->groups, vp);
        RDEBUG2("Group DN \"%s\" resolves to name \"%pV\"", *group_ctx->dn, &vp->data);
 
finish:
        /*
         *      Walk the pointer to the DN being resolved forward
         *      ready for the next resolution.
         */
        group_ctx->dn++;
 
        if (values) ldap_value_free_len(values);
        talloc_free(query);
 
        RETURN_MODULE_RCODE(rcode);
}
 
/** Move user object group attributes to the control list
 *
 * @param p_result      The result of adding user object group attributes
 * @param request       Current request.
 * @param group_ctx     Context used to evaluate group attributes
 * @return RLM_MODULE_OK
 */
static unlang_action_t ldap_cacheable_userobj_store(rlm_rcode_t *p_result, request_t *request,
                                                    ldap_group_userobj_ctx_t *group_ctx)
{
        fr_pair_t               *vp;
        fr_pair_list_t          *list;
 
        list = tmpl_list_head(request, request_attr_control);
        fr_assert(list != NULL);
 
        RDEBUG2("Adding cacheable user object memberships");
        RINDENT();
        if (RDEBUG_ENABLED) {
                for (vp = fr_pair_list_head(&group_ctx->groups);
                     vp;
                     vp = fr_pair_list_next(&group_ctx->groups, vp)) {
                        RDEBUG2("&control.%s += \"%pV\"", group_ctx->inst->group.cache_da->name, &vp->data);
                }
        }
 
        fr_pair_list_append(list, &group_ctx->groups);
        REXDENT();
 
        talloc_free(group_ctx);
        RETURN_MODULE_OK;
}
 
/** Initiate DN to name and name to DN group lookups
 *
 * Called repeatedly until there are no more lookups to perform
 * or an unresolved lookup causes the module to fail.
 *
 * @param p_result      The result of the previous expansion.
 * @param priority      unused.
 * @param request       Current request.
 * @param uctx          The group context being processed.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_cacheable_userobj_resolve(rlm_rcode_t *p_result, UNUSED int *priority,
                                                      request_t *request, void *uctx)
{
        ldap_group_userobj_ctx_t        *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_ctx_t);
 
        /*
         *      If we've previously failed to expand, fail the group section
         */
        switch (*p_result) {
        case RLM_MODULE_FAIL:
        case RLM_MODULE_INVALID:
                talloc_free(group_ctx);
                return UNLANG_ACTION_CALCULATE_RESULT;
        default:
                break;
        }
 
        /*
         *      Are there any DN to resolve to names?
         *      These are resolved one at a time as most directories don't allow for
         *      filters on the DN.
         */
        if (*group_ctx->dn) {
                if (unlang_function_repeat_set(request, ldap_cacheable_userobj_resolve) < 0) RETURN_MODULE_FAIL;
                if (unlang_function_push(request, ldap_group_dn2name_start, ldap_group_dn2name_resume,
                                         ldap_group_userobj_cancel, ~FR_SIGNAL_CANCEL,
                                         UNLANG_SUB_FRAME, group_ctx) < 0) RETURN_MODULE_FAIL;
                return UNLANG_ACTION_PUSHED_CHILD;
        }
 
        /*
         *      Are there any names to resolve to DN?
         */
        if (*group_ctx->group_name) {
                if (unlang_function_repeat_set(request, ldap_cacheable_userobj_resolve) < 0) RETURN_MODULE_FAIL;
                if (unlang_function_push(request, ldap_group_name2dn_start, ldap_group_name2dn_resume,
                                         ldap_group_userobj_cancel, ~FR_SIGNAL_CANCEL,
                                         UNLANG_SUB_FRAME, group_ctx) < 0) RETURN_MODULE_FAIL;
                return UNLANG_ACTION_PUSHED_CHILD;
        }
 
        /*
         *      Nothing left to resolve, move the resulting attributes to
         *      the control list.
         */
        return ldap_cacheable_userobj_store(p_result, request, group_ctx);
}
 
/** Convert group membership information into attributes
 *
 * This may just be able to parse attribute values in the user object
 * or it may need to yield to other LDAP searches depending on what was
 * returned and what is set to be cached.
 *
 * @param[out] p_result         The result of trying to resolve a dn to a group name.
 * @param[in] request           Current request.
 * @param[in] autz_ctx          LDAP authorization context being processed.
 * @param[in] attr              membership attribute to look for in the entry.
 * @return One of the RLM_MODULE_* values.
 */
unlang_action_t rlm_ldap_cacheable_userobj(rlm_rcode_t *p_result, request_t *request, ldap_autz_ctx_t *autz_ctx,
                                           char const *attr)
{
        rlm_ldap_t const                *inst = autz_ctx->inst;
        LDAPMessage                     *entry = autz_ctx->entry;
        fr_ldap_thread_trunk_t          *ttrunk = autz_ctx->ttrunk;
        ldap_group_userobj_ctx_t        *group_ctx;
        struct berval                   **values;
        char                            **name_p;
        char                            **dn_p;
        fr_pair_t                       *vp;
        int                             is_dn, i, count, name2dn = 0, dn2name = 0;
 
        fr_assert(entry);
        fr_assert(attr);
 
        /*
         *      Parse the membership information we got in the initial user query.
         */
        values = ldap_get_values_len(fr_ldap_handle_thread_local(), entry, attr);
        if (!values) {
                RDEBUG2("No cacheable group memberships found in user object");
 
                RETURN_MODULE_OK;
        }
        count = ldap_count_values_len(values);
 
        /*
         *      Set up context for managing group membership attribute resolution.
         */
        MEM(group_ctx = talloc_zero(unlang_interpret_frame_talloc_ctx(request), ldap_group_userobj_ctx_t));
        group_ctx->inst = inst;
        group_ctx->ttrunk = ttrunk;
        group_ctx->base_dn = &autz_ctx->call_env->group_base;
        group_ctx->list_ctx = tmpl_list_ctx(request, request_attr_control);
        fr_assert(group_ctx->list_ctx != NULL);
 
        /*
         *      Set up pointers to entries in arrays of names / DNs to resolve.
         */
        name_p = group_ctx->group_name;
        group_ctx->dn = dn_p = group_ctx->group_dn;
 
        /*
         *      Temporary list to hold new group VPs, will be merged
         *      once all group info has been gathered/resolved
         *      successfully.
         */
        fr_pair_list_init(&group_ctx->groups);
 
        for (i = 0; (i < count); i++) {
                is_dn = fr_ldap_util_is_dn(values[i]->bv_val, values[i]->bv_len);
 
                if (inst->group.cacheable_dn) {
                        /*
                         *      The easy case, we're caching DNs and we got a DN.
                         */
                        if (is_dn) {
                                MEM(vp = fr_pair_afrom_da(group_ctx->list_ctx, inst->group.cache_da));
                                fr_pair_value_bstrndup(vp, values[i]->bv_val, values[i]->bv_len, true);
                                fr_pair_append(&group_ctx->groups, vp);
                        /*
                         *      We were told to cache DNs but we got a name, we now need to resolve
                         *      this to a DN. Store all the group names in an array so we can do one query.
                         */
                        } else {
                                if (++name2dn > LDAP_MAX_CACHEABLE) {
                                        REDEBUG("Too many groups require name to DN resolution");
                                invalid:
                                        ldap_value_free_len(values);
                                        talloc_free(group_ctx);
                                        RETURN_MODULE_INVALID;
                                }
                                *name_p++ = fr_ldap_berval_to_string(group_ctx, values[i]);
                        }
                }
 
                if (inst->group.cacheable_name) {
                        /*
                         *      The easy case, we're caching names and we got a name.
                         */
                        if (!is_dn) {
                                MEM(vp = fr_pair_afrom_da(group_ctx->list_ctx, inst->group.cache_da));
                                fr_pair_value_bstrndup(vp, values[i]->bv_val, values[i]->bv_len, true);
                                fr_pair_append(&group_ctx->groups, vp);
                        /*
                         *      We were told to cache names but we got a DN, we now need to resolve
                         *      this to a name.  Store group DNs which need resolving to names.
                         */
                        } else {
                                if (++dn2name > LDAP_MAX_CACHEABLE) {
                                        REDEBUG("Too many groups require DN to name resolution");
                                        goto invalid;
                                }
                                *dn_p++ = fr_ldap_berval_to_string(group_ctx, values[i]);
                        }
                }
        }
 
        ldap_value_free_len(values);
 
        /*
         *      We either have group names which need converting to DNs or
         *      DNs which need resolving to names.  Push a function which will
         *      do the resolution.
         */
        if ((name_p != group_ctx->group_name) || (dn_p != group_ctx->group_dn)) {
                group_ctx->attrs[0] = inst->group.obj_name_attr;
                if (unlang_function_push(request, ldap_cacheable_userobj_resolve, NULL, ldap_group_userobj_cancel,
                                         ~FR_SIGNAL_CANCEL, UNLANG_SUB_FRAME, group_ctx) < 0) {
                        talloc_free(group_ctx);
                        RETURN_MODULE_FAIL;
                }
                return UNLANG_ACTION_PUSHED_CHILD;
        }
 
        /*
         *      No additional queries needed, just process the context to
         *      move any generated pairs into the correct list.
         */
        return ldap_cacheable_userobj_store(p_result, request, group_ctx);
}
 
/** Initiate an LDAP search for group membership looking at the group objects
 *
 * @param[out] p_result         Result of submitting LDAP search
 * @param[out] priority         Unused.
 * @param[in] request           Current request.
 * @param[in] uctx              Group lookup context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_cacheable_groupobj_start(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                     void *uctx)
{
        ldap_group_groupobj_ctx_t       *group_ctx = talloc_get_type_abort(uctx, ldap_group_groupobj_ctx_t);
        rlm_ldap_t const                *inst = group_ctx->inst;
        fr_value_box_t                  *filter;
 
        filter = fr_value_box_list_head(&group_ctx->expanded_filter);
 
        if (filter->type != FR_TYPE_STRING) RETURN_MODULE_FAIL;
 
        group_ctx->attrs[0] = inst->group.obj_name_attr;
        return fr_ldap_trunk_search(group_ctx, &group_ctx->query, request, group_ctx->ttrunk,
                                    group_ctx->base_dn->vb_strvalue, inst->group.obj_scope,
                                    filter->vb_strvalue, group_ctx->attrs, NULL, NULL);
}
 
/** Cancel a pending group object lookup.
 *
 */
static void ldap_group_groupobj_cancel(UNUSED request_t *request, UNUSED fr_signal_t action, void *uctx)
{
        ldap_group_groupobj_ctx_t       *group_ctx = talloc_get_type_abort(uctx, ldap_group_groupobj_ctx_t);
 
        /*
         *      If the query is not in flight, just return
         */
        if (!group_ctx->query || !group_ctx->query->treq) return;
 
        fr_trunk_request_signal_cancel(group_ctx->query->treq);
}
 
/** Process the results of a group object lookup.
 *
 * @param[out] p_result         Result of processing group lookup.
 * @param[out] priority         Unused.
 * @param[in] request           Current request.
 * @param[in] uctx              Group lookup context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_cacheable_groupobj_resume(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                      void *uctx)
{
        ldap_group_groupobj_ctx_t       *group_ctx = talloc_get_type_abort(uctx, ldap_group_groupobj_ctx_t);
        rlm_ldap_t const                *inst = group_ctx->inst;
        fr_ldap_query_t                 *query = group_ctx->query;
        rlm_rcode_t                     rcode = RLM_MODULE_OK;
        LDAPMessage                     *entry;
        int                             ldap_errno;
        char                            *dn;
        fr_pair_t                       *vp;
 
        switch (query->ret) {
        case LDAP_SUCCESS:
                break;
 
        case LDAP_RESULT_NO_RESULT:
        case LDAP_RESULT_BAD_DN:
                RDEBUG2("No cacheable group memberships found in group objects");
                rcode = RLM_MODULE_NOTFOUND;
                goto finish;
 
        default:
                rcode = RLM_MODULE_FAIL;
                goto finish;
        }
 
        entry = ldap_first_entry(query->ldap_conn->handle, query->result);
        if (!entry) {
                ldap_get_option(query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
 
                goto finish;
        }
 
        RDEBUG2("Adding cacheable group object memberships");
        do {
                if (inst->group.cacheable_dn) {
                        dn = ldap_get_dn(query->ldap_conn->handle, entry);
                        if (!dn) {
                                ldap_get_option(query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                                REDEBUG("Retrieving object DN from entry failed: %s", ldap_err2string(ldap_errno));
 
                                goto finish;
                        }
                        fr_ldap_util_normalise_dn(dn, dn);
 
                        MEM(pair_append_control(&vp, inst->group.cache_da) == 0);
                        fr_pair_value_strdup(vp, dn, false);
 
                        RINDENT();
                        RDEBUG2("&control.%pP", vp);
                        REXDENT();
                        ldap_memfree(dn);
                }
 
                if (inst->group.cacheable_name) {
                        struct berval **values;
 
                        values = ldap_get_values_len(query->ldap_conn->handle, entry, inst->group.obj_name_attr);
                        if (!values) continue;
 
                        MEM(pair_append_control(&vp, inst->group.cache_da) == 0);
                        fr_pair_value_bstrndup(vp, values[0]->bv_val, values[0]->bv_len, true);
 
                        RINDENT();
                        RDEBUG2("&control.%pP", vp);
                        REXDENT();
 
                        ldap_value_free_len(values);
                }
        } while ((entry = ldap_next_entry(query->ldap_conn->handle, entry)));
 
finish:
        talloc_free(group_ctx);
 
        RETURN_MODULE_RCODE(rcode);
}
 
/** Convert group membership information into attributes
 *
 * @param[out] p_result         The result of trying to resolve a dn to a group name.
 * @param[in] request           Current request.
 * @param[in] autz_ctx          Authentication context being processed.
 * @return One of the RLM_MODULE_* values.
 */
unlang_action_t rlm_ldap_cacheable_groupobj(rlm_rcode_t *p_result, request_t *request, ldap_autz_ctx_t *autz_ctx)
{
        rlm_ldap_t const                *inst = autz_ctx->inst;
        ldap_group_groupobj_ctx_t       *group_ctx;
 
        if (!inst->group.obj_membership_filter) {
                RDEBUG2("Skipping caching group objects as directive 'group.membership_filter' is not set");
                RETURN_MODULE_OK;
        }
 
        if (autz_ctx->call_env->group_base.type != FR_TYPE_STRING) {
                REDEBUG("Missing group base_dn");
                RETURN_MODULE_INVALID;
        }
 
        MEM(group_ctx = talloc_zero(unlang_interpret_frame_talloc_ctx(request), ldap_group_groupobj_ctx_t));
        group_ctx->inst = inst;
        group_ctx->ttrunk = autz_ctx->ttrunk;
        group_ctx->base_dn = &autz_ctx->call_env->group_base;
        fr_value_box_list_init(&group_ctx->expanded_filter);
 
        if (unlang_function_push(request, ldap_cacheable_groupobj_start, ldap_cacheable_groupobj_resume,
                                 ldap_group_groupobj_cancel, ~FR_SIGNAL_CANCEL, UNLANG_SUB_FRAME, group_ctx) < 0) {
        error:
                talloc_free(group_ctx);
                RETURN_MODULE_FAIL;
        }
 
        if (unlang_tmpl_push(group_ctx, &group_ctx->expanded_filter, request, autz_ctx->call_env->group_filter, NULL) < 0) goto error;
 
        return UNLANG_ACTION_PUSHED_CHILD;
}
 
/** Process the results of a group object lookup.
 *
 * @param[out] p_result         Result of processing group lookup.
 * @param[out] priority         Unused.
 * @param[in] request           Current request.
 * @param[in] uctx              Group lookup context.
 * @return One of the RLM_MODULE_* values.
 */
static unlang_action_t ldap_check_groupobj_resume(rlm_rcode_t *p_result, UNUSED int *priority, request_t *request,
                                                      void *uctx)
{
        ldap_group_groupobj_ctx_t       *group_ctx = talloc_get_type_abort(uctx, ldap_group_groupobj_ctx_t);
        ldap_memberof_xlat_ctx_t        *xlat_ctx = talloc_get_type_abort(group_ctx->uctx, ldap_memberof_xlat_ctx_t);
        fr_ldap_query_t                 *query = group_ctx->query;
        rlm_rcode_t                     rcode = RLM_MODULE_OK;
 
        switch (query->ret) {
        case LDAP_SUCCESS:
                xlat_ctx->found = true;
                if (RDEBUG_ENABLED2) {
                        LDAPMessage     *entry = NULL;
                        char            *dn = NULL;
                        entry = ldap_first_entry(query->ldap_conn->handle, query->result);
                        if (entry) {
                                dn = ldap_get_dn(query->ldap_conn->handle, entry);
                                RDEBUG2("User found in group object \"%pV\"", fr_box_strvalue(dn));
                                ldap_memfree(dn);
                        }
                }
                break;
 
        case LDAP_RESULT_NO_RESULT:
        case LDAP_RESULT_BAD_DN:
                rcode = RLM_MODULE_NOTFOUND;
                break;
 
        default:
                rcode = RLM_MODULE_FAIL;
                break;
        }
 
        talloc_free(group_ctx);
        RETURN_MODULE_RCODE(rcode);
}
 
/** Initiate an LDAP search to determine group membership, querying group objects
 *
 * Used by LDAP group membership xlat
 *
 * @param p_result      Current module result code.
 * @param request       Current request.
 * @param xlat_ctx      xlat context being processed.
 */
unlang_action_t rlm_ldap_check_groupobj_dynamic(rlm_rcode_t *p_result, request_t *request,
                                                ldap_memberof_xlat_ctx_t *xlat_ctx)
{
        rlm_ldap_t const                *inst = xlat_ctx->inst;
        ldap_group_groupobj_ctx_t       *group_ctx;
 
        MEM(group_ctx = talloc(unlang_interpret_frame_talloc_ctx(request), ldap_group_groupobj_ctx_t));
        *group_ctx = (ldap_group_groupobj_ctx_t) {
                .inst = inst,
                .ttrunk = xlat_ctx->ttrunk,
                .uctx = xlat_ctx
        };
        fr_value_box_list_init(&group_ctx->expanded_filter);
 
        if (fr_ldap_util_is_dn(xlat_ctx->group->vb_strvalue, xlat_ctx->group->vb_length)) {
                group_ctx->filter_tmpl = xlat_ctx->env_data->group_filter;
                group_ctx->base_dn = xlat_ctx->group;
        } else {
                char            name_filter[LDAP_MAX_FILTER_STR_LEN];
                char const      *filters[] = { name_filter, inst->group.obj_filter, inst->group.obj_membership_filter };
                tmpl_rules_t    t_rules;
 
                if (!inst->group.obj_name_attr) {
                        REDEBUG("Told to search for group by name, but missing 'group.name_attribute' "
                                "directive");
                invalid:
                        talloc_free(group_ctx);
                        RETURN_MODULE_INVALID;
                }
 
                t_rules = (tmpl_rules_t){
                        .attr = {
                                .dict_def = request->dict,
                                .list_def = request_attr_request,
                        },
                        .xlat = {
                                .runtime_el = unlang_interpret_event_list(request),
                        },
                        .at_runtime = true,
                        .escape.func = fr_ldap_box_escape,
                        .escape.safe_for = (fr_value_box_safe_for_t)fr_ldap_box_escape,
                        .escape.mode = TMPL_ESCAPE_PRE_CONCAT,
                        .literals_safe_for = (fr_value_box_safe_for_t)fr_ldap_box_escape,
                        .cast = FR_TYPE_STRING,
                };
 
                snprintf(name_filter, sizeof(name_filter), "(%s=%s)",
                         inst->group.obj_name_attr, xlat_ctx->group->vb_strvalue);
 
                if (fr_ldap_filter_to_tmpl(group_ctx, &t_rules, filters, NUM_ELEMENTS(filters),
                                           &group_ctx->filter_tmpl) < 0) goto invalid;
 
                fr_assert(xlat_ctx->env_data);
                group_ctx->base_dn = &xlat_ctx->env_data->group_base;
        }
 
        if (unlang_function_push(request, ldap_cacheable_groupobj_start, ldap_check_groupobj_resume,
                                 ldap_group_groupobj_cancel, ~FR_SIGNAL_CANCEL,
                                 UNLANG_SUB_FRAME, group_ctx) < 0) {
        error:
                talloc_free(group_ctx);
                RETURN_MODULE_FAIL;
        }
 
        if (unlang_tmpl_push(group_ctx, &group_ctx->expanded_filter, request, group_ctx->filter_tmpl, NULL) < 0) goto error;
 
        return UNLANG_ACTION_PUSHED_CHILD;
}
 
/** Initiate resolving a group DN to its name
 *
 */
static unlang_action_t ldap_dn2name_start (rlm_rcode_t *p_result, UNUSED int *priority, request_t *request, void *uctx)
{
        ldap_group_userobj_dyn_ctx_t    *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_dyn_ctx_t);
        ldap_memberof_xlat_ctx_t        *xlat_ctx = group_ctx->xlat_ctx;
        rlm_ldap_t const                *inst = xlat_ctx->inst;
 
        if (!inst->group.obj_name_attr) {
                REDEBUG("Told to resolve group DN to name but missing 'group.name_attribute' directive");
                RETURN_MODULE_INVALID;
        }
 
        RDEBUG2("Resolving group DN \"%pV\" to group name", fr_box_strvalue_buffer(group_ctx->lookup_dn));
 
        return fr_ldap_trunk_search(group_ctx, &group_ctx->query, request, xlat_ctx->ttrunk,
                                    group_ctx->lookup_dn, LDAP_SCOPE_BASE, NULL, group_ctx->attrs,
                                    NULL, NULL);
}
 
/** Cancel an in-progress DN to name lookup.
 *
 */
static void ldap_dn2name_cancel(UNUSED request_t *request, UNUSED fr_signal_t action, void *uctx)
{
        ldap_group_userobj_dyn_ctx_t    *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_dyn_ctx_t);
 
        if (!group_ctx->query || !group_ctx->query->treq) return;
 
        fr_trunk_request_signal_cancel(group_ctx->query->treq);
}
 
/** Initiate a user lookup to check membership.
 *
 * Used when the user's DN is already known but cached group membership has not been stored
 *
 */
static unlang_action_t ldap_check_userobj_start(UNUSED rlm_rcode_t *p_result, UNUSED int *priority,
                                                request_t *request, void *uctx)
{
        ldap_group_userobj_dyn_ctx_t    *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_dyn_ctx_t);
        ldap_memberof_xlat_ctx_t        *xlat_ctx = talloc_get_type_abort(group_ctx->xlat_ctx, ldap_memberof_xlat_ctx_t);
 
        return fr_ldap_trunk_search(xlat_ctx, &xlat_ctx->query, request, xlat_ctx->ttrunk, xlat_ctx->dn,
                                    LDAP_SCOPE_BASE, NULL, xlat_ctx->attrs, NULL, NULL);
}
 
/** Process the results of evaluating a user object when checking group membership
 *
 */
static unlang_action_t ldap_check_userobj_resume(rlm_rcode_t *p_result, UNUSED int *priority,
                                                 request_t *request, void *uctx)
{
        ldap_group_userobj_dyn_ctx_t    *group_ctx = talloc_get_type_abort(uctx, ldap_group_userobj_dyn_ctx_t);
        ldap_memberof_xlat_ctx_t        *xlat_ctx = talloc_get_type_abort(group_ctx->xlat_ctx, ldap_memberof_xlat_ctx_t);
        rlm_ldap_t const                *inst = xlat_ctx->inst;
        fr_ldap_query_t                 *query = xlat_ctx->query;
        LDAPMessage                     *entry;
        int                             ldap_errno;
        bool                            value_is_dn = false;
        fr_value_box_t                  *group = xlat_ctx->group;
        char                            *value_name = NULL;
 
        /*
         *      If group_ctx->values is not populated, this is the first call
         *      - extract the returned values if any.
         */
        if (!group_ctx->values) {
                entry = ldap_first_entry(query->ldap_conn->handle, query->result);
                if (!entry) {
                        ldap_get_option(query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                        REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
                        RETURN_MODULE_FAIL;
                }
 
                group_ctx->values = ldap_get_values_len(query->ldap_conn->handle, entry, inst->group.userobj_membership_attr);
                if (!group_ctx->values) {
                        RDEBUG2("No group membership attribute(s) found in user object");
                        RETURN_MODULE_FAIL;
                }
 
                /*
                 *      To avoid re-assessing after each call out to do a DN -> name
                 *      lookup, cache this.
                 */
                group_ctx->count = ldap_count_values_len(group_ctx->values);
        }
 
        /*
         *      Following a call out to do a DN -> name lookup, group_ctx->query will be
         *      populated - process the results.
         */
        if (group_ctx->query) {
                char            *buff;
                struct berval   **values = NULL;
 
                switch (group_ctx->query->ret) {
                case LDAP_RESULT_SUCCESS:
                        break;
 
                case LDAP_RESULT_NO_RESULT:
                case LDAP_RESULT_BAD_DN:
                        REDEBUG("Group DN \"%pV\" did not resolve to an object",
                                fr_box_strvalue_buffer(group_ctx->lookup_dn));
                        RETURN_MODULE_INVALID;
 
                default:
                        RETURN_MODULE_FAIL;
                }
 
                entry = ldap_first_entry(group_ctx->query->ldap_conn->handle, group_ctx->query->result);
                if (!entry) {
                        ldap_get_option(group_ctx->query->ldap_conn->handle, LDAP_OPT_RESULT_CODE, &ldap_errno);
                        REDEBUG("Failed retrieving entry: %s", ldap_err2string(ldap_errno));
                        RETURN_MODULE_INVALID;
                }
 
                values = ldap_get_values_len(group_ctx->query->ldap_conn->handle, entry, inst->group.obj_name_attr);
                if (!values) {
                        REDEBUG("No %s attributes found in object", inst->group.obj_name_attr);
                        RETURN_MODULE_INVALID;
                }
 
                MEM(buff = talloc_bstrndup(group_ctx, values[0]->bv_val, values[0]->bv_len));
                RDEBUG2("Group DN \"%pV\" resolves to name \"%pV\"", fr_box_strvalue_buffer(group_ctx->lookup_dn),
                        fr_box_strvalue_len(values[0]->bv_val, values[0]->bv_len));
                ldap_value_free_len(values);
 
                if (group_ctx->resolving_value) {
                        value_name = buff;
                } else {
                        group_ctx->group_name = buff;
                }
        }
 
        /*
         *      Loop over the list of groups the user is a member of, looking for a match.
         */
        while (group_ctx->value_no < group_ctx->count) {
                struct berval   *value = group_ctx->values[group_ctx->value_no];
 
                /*
                 *      We have come back from resolving a membership DN to its name,
                 *      compare to the provided name.
                 */
                if (value_name && group_ctx->resolving_value) {
                        if (((talloc_array_length(value_name) - 1) == group->vb_length) &&
                            (memcmp(group->vb_strvalue, value_name, group->vb_length) == 0)) {
                                RDEBUG2("User found in group \"%pV\". Comparison between membership: name "
                                       "(resolved from DN \"%pV\"), check: name", group,
                                       fr_box_strvalue_buffer(group_ctx->lookup_dn));
                                talloc_free(value_name);
                                goto found;
                        }
                        talloc_const_free(group_ctx->lookup_dn);
                        TALLOC_FREE(value_name);
                        group_ctx->resolving_value = false;
                        group_ctx->value_no++;
                        continue;
                }
 
                value_is_dn = fr_ldap_util_is_dn(value->bv_val, value->bv_len);
 
                RDEBUG2("Processing %s value \"%pV\" as a %s", inst->group.userobj_membership_attr,
                        fr_box_strvalue_len(value->bv_val, value->bv_len),
                        value_is_dn ? "DN" : "group name");
 
                /*
                 *      Both literal group names, do case sensitive comparison
                 */
                if (!xlat_ctx->group_is_dn && !value_is_dn) {
                        if ((group->vb_length == value->bv_len) &&
                            (memcmp(value->bv_val, group->vb_strvalue, value->bv_len) == 0)) {
                                RDEBUG2("User found in group \"%pV\". Comparison between membership: name, check: name",
                                       group);
                                goto found;
                        }
                        group_ctx->value_no++;
                        continue;
                }
 
                /*
                 *      Both DNs, do case insensitive, binary safe comparison
                 */
                if (xlat_ctx->group_is_dn && value_is_dn) {
                        if (fr_ldap_berval_strncasecmp(value, group->vb_strvalue, group->vb_length) == 0) {
                                RDEBUG2("User found in group DN \"%pV\". "
                                       "Comparison between membership: dn, check: dn", group);
                                goto found;
                        }
                        group_ctx->value_no++;
                        continue;
                }
 
                /*
                 *      If the value is not a DN, and the name we were given is a dn
                 *      convert the value to a DN and do a comparison.
                 */
                if (!value_is_dn && xlat_ctx->group_is_dn) {
                        /*
                         *      So we only do the DN -> name lookup once, regardless of how many
                         *      group values we have to check, the resolved name is put in group_ctx->group_name
                         */
                        if (!group_ctx->group_name) {
                                group_ctx->lookup_dn = group->vb_strvalue;
 
                                if (unlang_function_repeat_set(request, ldap_check_userobj_resume) < 0) RETURN_MODULE_FAIL;
 
                                return unlang_function_push(request, ldap_dn2name_start, NULL, ldap_dn2name_cancel,
                                                            ~FR_SIGNAL_CANCEL, UNLANG_SUB_FRAME, group_ctx);
                        }
 
                        if (((talloc_array_length(group_ctx->group_name) - 1) == value->bv_len) &&
                            (memcmp(value->bv_val, group_ctx->group_name, value->bv_len) == 0)) {
                                RDEBUG2("User found in group \"%pV\". Comparison between membership: "
                                        "name, check: name (resolved from DN \"%pV\")",
                                        fr_box_strvalue_len(value->bv_val, value->bv_len), group);
                                goto found;
                        }
                        group_ctx->value_no++;
                        continue;
                }
 
                /*
                 *      We have a value which is a DN, and a check item which specifies the name of a group,
                 *      convert the value to a name so we can do a comparison.
                 */
                if (value_is_dn && !xlat_ctx->group_is_dn) {
                        group_ctx->lookup_dn = fr_ldap_berval_to_string(group_ctx, value);
                        group_ctx->resolving_value = true;
 
                        if (unlang_function_repeat_set(request, ldap_check_userobj_resume) < 0) RETURN_MODULE_FAIL;
 
                        return unlang_function_push(request, ldap_dn2name_start, NULL, ldap_dn2name_cancel,
                                                    ~FR_SIGNAL_CANCEL, UNLANG_SUB_FRAME, group_ctx);
                }
 
                fr_assert(0);
        }
        RETURN_MODULE_NOTFOUND;
 
found:
        xlat_ctx->found = true;
        RETURN_MODULE_OK;
}
 
/** Ensure retrieved LDAP values are cleared up
 *
 */
static int userobj_dyn_free(ldap_group_userobj_dyn_ctx_t *group_ctx)
{
        if (group_ctx->values) ldap_value_free_len(group_ctx->values);
        return 0;
}
 
/** Query the LDAP directory to check if a user object is a member of a group
 *
 * @param[out] p_result         Result of calling the module.
 * @param[in] request           Current request.
 * @param[in] xlat_ctx          Context of the xlat being evaluated.
 */
unlang_action_t rlm_ldap_check_userobj_dynamic(rlm_rcode_t *p_result, request_t *request,
                                               ldap_memberof_xlat_ctx_t *xlat_ctx)
{
        rlm_ldap_t const                *inst = xlat_ctx->inst;
        ldap_group_userobj_dyn_ctx_t    *group_ctx;
 
        MEM(group_ctx = talloc(unlang_interpret_frame_talloc_ctx(request), ldap_group_userobj_dyn_ctx_t));
        talloc_set_destructor(group_ctx, userobj_dyn_free);
 
        *group_ctx = (ldap_group_userobj_dyn_ctx_t) {
                .xlat_ctx = xlat_ctx,
                .attrs = { inst->group.obj_name_attr, NULL }
        };
 
        RDEBUG2("Checking user object's %s attributes", inst->group.userobj_membership_attr);
 
        /*
         *      If a previous query was required to find the user DN, that will have
         *      retrieved the user object membership attribute and the resulting values
         *      can be checked.
         *      If not then a query is needed to retrieve the user object.
         */
        if (unlang_function_push(request, xlat_ctx->query ? NULL : ldap_check_userobj_start, ldap_check_userobj_resume,
                                 ldap_group_userobj_cancel, ~FR_SIGNAL_CANCEL, UNLANG_SUB_FRAME, group_ctx) < 0) {
                talloc_free(group_ctx);
                RETURN_MODULE_FAIL;
        }
 
        return UNLANG_ACTION_PUSHED_CHILD;
}
 
/** Check group membership attributes to see if a user is a member.
 *
 * @param[out] p_result         Result of calling the module.
 * @param[in] inst              rlm_ldap configuration.
 * @param[in] request           Current request.
 * @param[in] check             vb containing the group value (name or dn).
 */
unlang_action_t rlm_ldap_check_cached(rlm_rcode_t *p_result,
                                      rlm_ldap_t const *inst, request_t *request, fr_value_box_t const *check)
{
        fr_pair_t       *vp;
        int             ret;
        fr_dcursor_t    cursor;
 
        /*
         *      We return RLM_MODULE_INVALID here as an indication
         *      the caller should try a dynamic group lookup instead.
         */
        vp =  fr_pair_dcursor_by_da_init(&cursor, &request->control_pairs, inst->group.cache_da);
        if (!vp) RETURN_MODULE_INVALID;
 
        for (vp = fr_dcursor_current(&cursor);
             vp;
             vp = fr_dcursor_next(&cursor)) {
                ret = fr_value_box_cmp_op(T_OP_CMP_EQ, &vp->data, check);
                if (ret == 1) {
                        RDEBUG2("User found. Matched cached membership");
                        RETURN_MODULE_OK;
                }
 
                if (ret < -1) RETURN_MODULE_FAIL;
        }
 
        RDEBUG2("Cached membership not found");
 
        RETURN_MODULE_NOTFOUND;
}