Remove restrictions on number of DN components in LDAP server
[kai/samba.git] / source4 / ldap_server / ldap_backend.c
index aaa8e453ca31d807d2f172f5b73025d50f0a206e..2adff2a1dfad5d5e9c43075dddc3fb4a2f6196ac 100644 (file)
@@ -5,7 +5,7 @@
    
    This program 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
+   the Free Software Foundation; either version 3 of the License, or
    (at your option) any later version.
    
    This program is distributed in the hope that it will be useful,
    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., 675 Mass Ave, Cambridge, MA 02139, USA.
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
 #include "includes.h"
 #include "ldap_server/ldap_server.h"
-#include "lib/util/dlinklist.h"
+#include "../lib/util/dlinklist.h"
 #include "libcli/ldap/ldap.h"
-#include "lib/ldb/include/ldb.h"
-#include "lib/ldb/include/ldb_errors.h"
-#include "lib/db_wrap.h"
 #include "auth/credentials/credentials.h"
 #include "auth/gensec/gensec.h"
+#include "param/param.h"
+#include "smbd/service_stream.h"
+#include "dsdb/samdb/samdb.h"
+#include "lib/ldb/include/ldb_errors.h"
+#include "lib/ldb_wrap.h"
 
-#define VALID_DN_SYNTAX(dn,i) do {\
+#define VALID_DN_SYNTAX(dn) do {\
        if (!(dn)) {\
                return NT_STATUS_NO_MEMORY;\
        } else if ( ! ldb_dn_validate(dn)) {\
                result = LDAP_INVALID_DN_SYNTAX;\
                errstr = "Invalid DN format";\
                goto reply;\
-       } else if (ldb_dn_get_comp_num(dn) < (i)) {\
-               result = LDAP_INVALID_DN_SYNTAX;\
-               errstr = "Invalid DN (" #i " components needed for '" #dn "')";\
-               goto reply;\
        }\
 } while(0)
 
@@ -55,8 +52,13 @@ static int map_ldb_error(struct ldb_context *ldb, int err, const char **errstrin
 */
 NTSTATUS ldapsrv_backend_Init(struct ldapsrv_connection *conn) 
 {
-       conn->ldb = ldb_wrap_connect(conn, lp_sam_url(), conn->session_info,
-                                    NULL, conn->global_catalog ? LDB_FLG_RDONLY : 0, NULL);
+       conn->ldb = ldb_wrap_connect(conn, 
+                                    conn->connection->event.ctx,
+                                    conn->lp_ctx,
+                                    lp_sam_url(conn->lp_ctx), 
+                                    conn->session_info,
+                                    samdb_credentials(conn, conn->connection->event.ctx, conn->lp_ctx), 
+                                    conn->global_catalog ? LDB_FLG_RDONLY : 0, NULL);
        if (conn->ldb == NULL) {
                return NT_STATUS_INTERNAL_DB_CORRUPTION;
        }
@@ -64,12 +66,13 @@ NTSTATUS ldapsrv_backend_Init(struct ldapsrv_connection *conn)
        if (conn->server_credentials) {
                char **sasl_mechs = NULL;
                struct gensec_security_ops **backends = gensec_security_all();
-               enum credentials_use_kerberos use_kerberos
-                       = cli_credentials_get_kerberos_state(conn->server_credentials);
                struct gensec_security_ops **ops
-                       = gensec_use_kerberos_mechs(conn, backends, use_kerberos);
+                       = gensec_use_kerberos_mechs(conn, backends, conn->server_credentials);
                int i, j = 0;
                for (i = 0; ops && ops[i]; i++) {
+                       if (!gensec_security_ops_enabled(ops[i], conn->lp_ctx))
+                               continue;
+
                        if (ops[i]->sasl_name && ops[i]->server_start) {
                                char *sasl_name = talloc_strdup(conn, ops[i]->sasl_name);
 
@@ -90,10 +93,6 @@ NTSTATUS ldapsrv_backend_Init(struct ldapsrv_connection *conn)
                ldb_set_opaque(conn->ldb, "supportedSASLMechanims", sasl_mechs);
        }
 
-       if (conn->global_catalog) {
-               ldb_set_opaque(conn->ldb, "global_catalog", (void *)(-1));
-       }
-
        return NT_STATUS_OK;
 }
 
@@ -123,7 +122,7 @@ void ldapsrv_queue_reply(struct ldapsrv_call *call, struct ldapsrv_reply *reply)
        DLIST_ADD_END(call->replies, reply, struct ldapsrv_reply *);
 }
 
-NTSTATUS ldapsrv_unwilling(struct ldapsrv_call *call, int error)
+static NTSTATUS ldapsrv_unwilling(struct ldapsrv_call *call, int error)
 {
        struct ldapsrv_reply *reply;
        struct ldap_ExtendedResponse *r;
@@ -158,9 +157,11 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
        struct ldb_dn *basedn;
        struct ldb_result *res = NULL;
        struct ldb_request *lreq;
+       struct ldb_control *search_control;
+       struct ldb_search_options_control *search_options;
        enum ldb_scope scope = LDB_SCOPE_DEFAULT;
        const char **attrs = NULL;
-       const char *errstr = NULL;
+       const char *scope_str, *errstr = NULL;
        int success_limit = 1;
        int result = -1;
        int ldb_ret = -1;
@@ -174,32 +175,33 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(local_ctx);
 
        basedn = ldb_dn_new(local_ctx, samdb, req->basedn);
-       VALID_DN_SYNTAX(basedn, 0);
+       VALID_DN_SYNTAX(basedn);
 
        DEBUG(10, ("SearchRequest: basedn: [%s]\n", req->basedn));
        DEBUG(10, ("SearchRequest: filter: [%s]\n", ldb_filter_from_tree(call, req->tree)));
 
        switch (req->scope) {
                case LDAP_SEARCH_SCOPE_BASE:
-                       DEBUG(10,("SearchRequest: scope: [BASE]\n"));
+                       scope_str = "BASE";
                        scope = LDB_SCOPE_BASE;
                        success_limit = 0;
                        break;
                case LDAP_SEARCH_SCOPE_SINGLE:
-                       DEBUG(10,("SearchRequest: scope: [ONE]\n"));
+                       scope_str = "ONE";
                        scope = LDB_SCOPE_ONELEVEL;
                        success_limit = 0;
                        break;
                case LDAP_SEARCH_SCOPE_SUB:
-                       DEBUG(10,("SearchRequest: scope: [SUB]\n"));
+                       scope_str = "SUB";
                        scope = LDB_SCOPE_SUBTREE;
                        success_limit = 0;
                        break;
                default:
                        result = LDAP_PROTOCOL_ERROR;
                        errstr = "Invalid scope";
-                       break;
+                       goto reply;
        }
+       DEBUG(10,("SearchRequest: scope: [%s]\n", scope_str));
 
        if (req->num_attributes >= 1) {
                attrs = talloc_array(local_ctx, const char *, req->num_attributes+1);
@@ -212,27 +214,37 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
                attrs[i] = NULL;
        }
 
-       DEBUG(5,("ldb_request dn=%s filter=%s\n", 
-                req->basedn, ldb_filter_from_tree(call, req->tree)));
-
-       lreq = talloc(local_ctx, struct ldb_request);
-       NT_STATUS_HAVE_NO_MEMORY(lreq);
+       DEBUG(5,("ldb_request %s dn=%s filter=%s\n", 
+                scope_str, req->basedn, ldb_filter_from_tree(call, req->tree)));
 
        res = talloc_zero(local_ctx, struct ldb_result);
        NT_STATUS_HAVE_NO_MEMORY(res);
-       
-       lreq->operation = LDB_SEARCH;
-       lreq->op.search.base = basedn;
-       lreq->op.search.scope = scope;
-       lreq->op.search.tree = req->tree;
-       lreq->op.search.attrs = attrs;
 
-       lreq->controls = call->request->controls;
+       ldb_ret = ldb_build_search_req_ex(&lreq, samdb, local_ctx,
+                                         basedn, scope,
+                                         req->tree, attrs,
+                                         call->request->controls,
+                                         res, ldb_search_default_callback,
+                                         NULL);
 
-       lreq->context = res;
-       lreq->callback = ldb_search_default_callback;
+       if (ldb_ret != LDB_SUCCESS) {
+               goto reply;
+       }
 
-       /* Copy the timeout from the incoming call */
+       if (call->conn->global_catalog) {
+               search_control = ldb_request_get_control(lreq, LDB_CONTROL_SEARCH_OPTIONS_OID);
+
+               search_options = NULL;
+               if (search_control) {
+                       search_options = talloc_get_type(search_control->data, struct ldb_search_options_control);
+                       search_options->search_options |= LDB_SEARCH_OPTION_PHANTOM_ROOT;
+               } else {
+                       search_options = talloc(lreq, struct ldb_search_options_control);
+                       NT_STATUS_HAVE_NO_MEMORY(search_options);
+                       search_options->search_options = LDB_SEARCH_OPTION_PHANTOM_ROOT;
+                       ldb_request_add_control(lreq, LDB_CONTROL_SEARCH_OPTIONS_OID, false, search_options);
+               }
+       }
        ldb_set_timeout(samdb, lreq, req->timelimit);
 
        ldb_ret = ldb_request(samdb, lreq);
@@ -248,6 +260,11 @@ static NTSTATUS ldapsrv_SearchRequest(struct ldapsrv_call *call)
                        ent_r = ldapsrv_init_reply(call, LDAP_TAG_SearchResultEntry);
                        NT_STATUS_HAVE_NO_MEMORY(ent_r);
 
+                       /* Better to have the whole message kept here,
+                        * than to find someone further up didn't put
+                        * a value in the right spot in the talloc tree */
+                       talloc_steal(ent_r, res->msgs[i]);
+                       
                        ent = &ent_r->msg->r.SearchResultEntry;
                        ent->dn = ldb_dn_alloc_linearized(ent_r, res->msgs[i]->dn);
                        ent->num_attributes = 0;
@@ -288,10 +305,6 @@ reply:
                        DEBUG(10,("SearchRequest: results: [%d]\n", res->count));
                        result = LDAP_SUCCESS;
                        errstr = NULL;
-               } else if (res->count == 0) {
-                       DEBUG(10,("SearchRequest: no results\n"));
-                       result = LDAP_NO_SUCH_OBJECT;
-                       errstr = ldb_errstring(samdb);
                }
                if (res->controls) {
                        done_r->msg->controls = res->controls;
@@ -332,7 +345,7 @@ static NTSTATUS ldapsrv_ModifyRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(local_ctx);
 
        dn = ldb_dn_new(local_ctx, samdb, req->dn);
-       VALID_DN_SYNTAX(dn, 1);
+       VALID_DN_SYNTAX(dn);
 
        DEBUG(10, ("ModifyRequest: dn: [%s]\n", req->dn));
 
@@ -340,7 +353,6 @@ static NTSTATUS ldapsrv_ModifyRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(msg);
 
        msg->dn = dn;
-       msg->private_data = NULL;
        msg->num_elements = 0;
        msg->elements = NULL;
 
@@ -436,7 +448,7 @@ static NTSTATUS ldapsrv_AddRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(local_ctx);
 
        dn = ldb_dn_new(local_ctx, samdb, req->dn);
-       VALID_DN_SYNTAX(dn,1);
+       VALID_DN_SYNTAX(dn);
 
        DEBUG(10, ("AddRequest: dn: [%s]\n", req->dn));
 
@@ -444,7 +456,6 @@ static NTSTATUS ldapsrv_AddRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(msg);
 
        msg->dn = dn;
-       msg->private_data = NULL;
        msg->num_elements = 0;
        msg->elements = NULL;
 
@@ -527,7 +538,7 @@ static NTSTATUS ldapsrv_DelRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(local_ctx);
 
        dn = ldb_dn_new(local_ctx, samdb, req->dn);
-       VALID_DN_SYNTAX(dn,1);
+       VALID_DN_SYNTAX(dn);
 
        DEBUG(10, ("DelRequest: dn: [%s]\n", req->dn));
 
@@ -573,10 +584,10 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(local_ctx);
 
        olddn = ldb_dn_new(local_ctx, samdb, req->dn);
-       VALID_DN_SYNTAX(olddn, 2);
+       VALID_DN_SYNTAX(olddn);
 
        newrdn = ldb_dn_new(local_ctx, samdb, req->newrdn);
-       VALID_DN_SYNTAX(newrdn, 1);
+       VALID_DN_SYNTAX(newrdn);
 
        DEBUG(10, ("ModifyDNRequest: olddn: [%s]\n", req->dn));
        DEBUG(10, ("ModifyDNRequest: newrdn: [%s]\n", req->newrdn));
@@ -590,7 +601,7 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
 
        if (req->newsuperior) {
                parentdn = ldb_dn_new(local_ctx, samdb, req->newsuperior);
-               VALID_DN_SYNTAX(parentdn, 0);
+               VALID_DN_SYNTAX(parentdn);
                DEBUG(10, ("ModifyDNRequest: newsuperior: [%s]\n", req->newsuperior));
                
                if (ldb_dn_get_comp_num(parentdn) < 1) {
@@ -612,6 +623,7 @@ static NTSTATUS ldapsrv_ModifyDNRequest(struct ldapsrv_call *call)
                result = LDAP_OTHER;
                goto reply;
        }
+       newdn = parentdn;
 
 reply:
        modifydn_r = ldapsrv_init_reply(call, LDAP_TAG_ModifyDNResponse);
@@ -656,7 +668,7 @@ static NTSTATUS ldapsrv_CompareRequest(struct ldapsrv_call *call)
        NT_STATUS_HAVE_NO_MEMORY(local_ctx);
 
        dn = ldb_dn_new(local_ctx, samdb, req->dn);
-       VALID_DN_SYNTAX(dn, 1);
+       VALID_DN_SYNTAX(dn);
 
        DEBUG(10, ("CompareRequest: dn: [%s]\n", req->dn));
        filter = talloc_asprintf(local_ctx, "(%s=%*s)", req->attribute, 
@@ -672,8 +684,8 @@ reply:
        NT_STATUS_HAVE_NO_MEMORY(compare_r);
 
        if (result == LDAP_SUCCESS) {
-               ldb_ret = ldb_search(samdb, dn, LDB_SCOPE_BASE, filter, attrs, &res);
-               talloc_steal(local_ctx, res);
+               ldb_ret = ldb_search(samdb, local_ctx, &res,
+                                    dn, LDB_SCOPE_BASE, attrs, "%s", filter);
                if (ldb_ret != LDB_SUCCESS) {
                        result = map_ldb_error(samdb, ldb_ret, &errstr);
                        DEBUG(10,("CompareRequest: error: %s\n", errstr));
@@ -713,6 +725,18 @@ static NTSTATUS ldapsrv_AbandonRequest(struct ldapsrv_call *call)
 
 NTSTATUS ldapsrv_do_call(struct ldapsrv_call *call)
 {
+       int i;
+       struct ldap_message *msg = call->request;
+       /* Check for undecoded critical extensions */
+       for (i=0; msg->controls && msg->controls[i]; i++) {
+               if (!msg->controls_decoded[i] && 
+                   msg->controls[i]->critical) {
+                       DEBUG(3, ("ldapsrv_do_call: Critical extension %s is not known to this server\n",
+                                 msg->controls[i]->oid));
+                       return ldapsrv_unwilling(call, LDAP_UNAVAILABLE_CRITICAL_EXTENSION);
+               }
+       }
+
        switch(call->request->type) {
        case LDAP_TAG_BindRequest:
                return ldapsrv_BindRequest(call);