2 Unix SMB/CIFS implementation.
4 implement the DsWriteAccountSpn call
6 Copyright (C) Stefan Metzmacher 2009
7 Copyright (C) Andrew Tridgell 2010
9 This program is free software; you can redistribute it and/or modify
10 it under the terms of the GNU General Public License as published by
11 the Free Software Foundation; either version 3 of the License, or
12 (at your option) any later version.
14 This program is distributed in the hope that it will be useful,
15 but WITHOUT ANY WARRANTY; without even the implied warranty of
16 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 GNU General Public License for more details.
19 You should have received a copy of the GNU General Public License
20 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 #include "rpc_server/dcerpc_server.h"
25 #include "dsdb/samdb/samdb.h"
26 #include "dsdb/common/util.h"
27 #include "system/kerberos.h"
28 #include "auth/kerberos/kerberos.h"
29 #include "libcli/security/security.h"
30 #include "libcli/security/session.h"
31 #include "rpc_server/drsuapi/dcesrv_drsuapi.h"
32 #include "librpc/gen_ndr/ndr_drsuapi.h"
33 #include "auth/session.h"
36 check that the SPN update should be allowed as an override
39 This is only called if the client is not a domain controller or
42 static bool writespn_check_spn(struct drsuapi_bind_state *b_state,
43 struct dcesrv_call_state *dce_call,
48 * we only allow SPN updates if:
50 * 1) they are on the clients own account object
51 * 2) they are of the form SERVICE/dnshostname
53 struct dom_sid *user_sid, *sid;
54 TALLOC_CTX *tmp_ctx = talloc_new(dce_call);
55 struct ldb_result *res;
56 const char *attrs[] = { "objectSID", "dNSHostName", NULL };
60 krb5_principal principal;
61 const krb5_data *component;
62 const char *dns_name, *dnsHostName;
64 /* The service principal name shouldn't be NULL */
71 get the objectSid of the DN that is being modified, and
72 check it matches the user_sid in their token
75 ret = dsdb_search_dn(b_state->sam_ctx, tmp_ctx, &res, dn, attrs,
76 DSDB_SEARCH_ONE_ONLY);
77 if (ret != LDB_SUCCESS) {
82 user_sid = &dce_call->conn->auth_state.session_info->security_token->sids[PRIMARY_USER_SID_INDEX];
83 sid = samdb_result_dom_sid(tmp_ctx, res->msgs[0], "objectSid");
89 dnsHostName = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName",
91 if (dnsHostName == NULL) {
96 if (!dom_sid_equal(sid, user_sid)) {
101 kerr = smb_krb5_init_context_basic(tmp_ctx,
102 dce_call->conn->dce_ctx->lp_ctx,
105 talloc_free(tmp_ctx);
109 ret = krb5_parse_name_flags(krb_ctx, spn, KRB5_PRINCIPAL_PARSE_NO_REALM,
112 krb5_free_context(krb_ctx);
113 talloc_free(tmp_ctx);
117 if (krb5_princ_size(krb_ctx, principal) != 2) {
118 krb5_free_principal(krb_ctx, principal);
119 krb5_free_context(krb_ctx);
120 talloc_free(tmp_ctx);
124 component = krb5_princ_component(krb_ctx, principal, 1);
125 dns_name = (const char *)component->data;
127 if (strcasecmp(dns_name, dnsHostName) != 0) {
128 krb5_free_principal(krb_ctx, principal);
129 krb5_free_context(krb_ctx);
130 talloc_free(tmp_ctx);
134 /* its a simple update on their own account - allow it with
135 * permissions override */
136 krb5_free_principal(krb_ctx, principal);
137 krb5_free_context(krb_ctx);
138 talloc_free(tmp_ctx);
144 drsuapi_DsWriteAccountSpn
146 WERROR dcesrv_drsuapi_DsWriteAccountSpn(struct dcesrv_call_state *dce_call, TALLOC_CTX *mem_ctx,
147 struct drsuapi_DsWriteAccountSpn *r)
149 struct drsuapi_bind_state *b_state;
150 struct dcesrv_handle *h;
152 *r->out.level_out = r->in.level;
154 DCESRV_PULL_HANDLE_WERR(h, r->in.bind_handle, DRSUAPI_BIND_HANDLE);
157 r->out.res = talloc(mem_ctx, union drsuapi_DsWriteAccountSpnResult);
158 W_ERROR_HAVE_NO_MEMORY(r->out.res);
160 switch (r->in.level) {
162 struct drsuapi_DsWriteAccountSpnRequest1 *req;
163 struct ldb_message *msg;
167 unsigned spn_count=0;
168 bool passed_checks = true;
169 struct ldb_context *sam_ctx;
171 req = &r->in.req->req1;
174 msg = ldb_msg_new(mem_ctx);
176 return WERR_NOT_ENOUGH_MEMORY;
179 msg->dn = ldb_dn_new(msg, b_state->sam_ctx,
181 if ( ! ldb_dn_validate(msg->dn)) {
182 r->out.res->res1.status = WERR_OK;
187 for (i = 0; i < count; i++) {
188 if (!writespn_check_spn(b_state,
191 req->spn_names[i].str)) {
192 passed_checks = false;
194 ret = ldb_msg_add_string(msg,
195 "servicePrincipalName",
196 req->spn_names[i].str);
197 if (ret != LDB_SUCCESS) {
198 return WERR_NOT_ENOUGH_MEMORY;
203 if (msg->num_elements == 0) {
204 DEBUG(2,("No SPNs need changing on %s\n",
205 ldb_dn_get_linearized(msg->dn)));
206 r->out.res->res1.status = WERR_OK;
210 for (i=0;i<msg->num_elements;i++) {
211 switch (req->operation) {
212 case DRSUAPI_DS_SPN_OPERATION_ADD:
213 msg->elements[i].flags = LDB_FLAG_MOD_ADD;
215 case DRSUAPI_DS_SPN_OPERATION_REPLACE:
216 msg->elements[i].flags = LDB_FLAG_MOD_REPLACE;
218 case DRSUAPI_DS_SPN_OPERATION_DELETE:
219 msg->elements[i].flags = LDB_FLAG_MOD_DELETE;
224 if (passed_checks && b_state->sam_ctx_system) {
225 sam_ctx = b_state->sam_ctx_system;
227 sam_ctx = b_state->sam_ctx;
230 /* Apply to database */
231 ret = dsdb_modify(sam_ctx, msg, DSDB_MODIFY_PERMISSIVE);
232 if (ret != LDB_SUCCESS) {
233 DEBUG(0,("Failed to modify SPNs on %s: %s\n",
234 ldb_dn_get_linearized(msg->dn),
235 ldb_errstring(b_state->sam_ctx)));
237 drsuapi_DsWriteAccountSpn, r);
238 r->out.res->res1.status = WERR_ACCESS_DENIED;
240 DEBUG(2,("Modified %u SPNs on %s\n", spn_count,
241 ldb_dn_get_linearized(msg->dn)));
242 r->out.res->res1.status = WERR_OK;
249 return WERR_INVALID_LEVEL;