a4c6b81ce9
Allow the windc plugin to also implement an audit callback. As part of this change, both the HDB and windc audit function signatures are changed to return void.
363 lines
11 KiB
C
363 lines
11 KiB
C
/*
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* Copyright (c) 1997 - 2001 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "kdc_locl.h"
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static int
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name_type_ok(krb5_context context,
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krb5_kdc_configuration *config,
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krb5_const_principal principal)
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{
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int nt = krb5_principal_get_type(context, principal);
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if (!krb5_principal_is_krbtgt(context, principal))
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return 1;
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if (nt == KRB5_NT_SRV_INST || nt == KRB5_NT_UNKNOWN)
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return 1;
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if (config->strict_nametypes == 0)
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return 1;
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return 0;
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}
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struct timeval _kdc_now;
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static krb5_error_code
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synthesize_hdb_close(krb5_context context, struct HDB *db)
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{
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(void) context;
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(void) db;
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return 0;
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}
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/*
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* Synthesize an HDB entry suitable for PKINIT and GSS preauth.
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*/
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static krb5_error_code
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synthesize_client(krb5_context context,
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krb5_kdc_configuration *config,
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krb5_const_principal princ,
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HDB **db,
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hdb_entry_ex **h)
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{
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static HDB null_db;
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krb5_error_code ret;
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hdb_entry_ex *e;
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/* Hope this works! */
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null_db.hdb_destroy = synthesize_hdb_close;
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null_db.hdb_close = synthesize_hdb_close;
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if (db)
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*db = &null_db;
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ret = (e = calloc(1, sizeof(*e))) ? 0 : krb5_enomem(context);
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if (ret == 0) {
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e->entry.flags.client = 1;
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e->entry.flags.immutable = 1;
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e->entry.flags.virtual = 1;
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e->entry.flags.synthetic = 1;
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e->entry.flags.do_not_store = 1;
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e->entry.kvno = 1;
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e->entry.keys.len = 0;
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e->entry.keys.val = NULL;
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e->entry.created_by.time = time(NULL);
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e->entry.modified_by = NULL;
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e->entry.valid_start = NULL;
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e->entry.valid_end = NULL;
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e->entry.pw_end = NULL;
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e->entry.etypes = NULL;
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e->entry.generation = NULL;
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e->entry.extensions = NULL;
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}
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if (ret == 0)
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ret = (e->entry.max_renew = calloc(1, sizeof(*e->entry.max_renew))) ?
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0 : krb5_enomem(context);
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if (ret == 0)
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ret = (e->entry.max_life = calloc(1, sizeof(*e->entry.max_life))) ?
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0 : krb5_enomem(context);
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if (ret == 0)
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ret = krb5_copy_principal(context, princ, &e->entry.principal);
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if (ret == 0)
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ret = krb5_copy_principal(context, princ, &e->entry.created_by.principal);
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if (ret == 0) {
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/*
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* We can't check OCSP in the TGS path, so we can't let tickets for
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* synthetic principals live very long.
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*/
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*(e->entry.max_renew) = config->synthetic_clients_max_renew;
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*(e->entry.max_life) = config->synthetic_clients_max_life;
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*h = e;
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} else {
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hdb_free_entry(context, e);
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}
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return ret;
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}
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krb5_error_code
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_kdc_db_fetch(krb5_context context,
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krb5_kdc_configuration *config,
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krb5_const_principal principal,
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unsigned flags,
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krb5uint32 *kvno_ptr,
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HDB **db,
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hdb_entry_ex **h)
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{
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hdb_entry_ex *ent = NULL;
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krb5_error_code ret = HDB_ERR_NOENTRY;
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int i;
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unsigned kvno = 0;
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krb5_principal enterprise_principal = NULL;
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krb5_const_principal princ;
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*h = NULL;
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if (!name_type_ok(context, config, principal))
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return HDB_ERR_NOENTRY;
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flags |= HDB_F_DECRYPT;
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if (kvno_ptr != NULL && *kvno_ptr != 0) {
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kvno = *kvno_ptr;
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flags |= HDB_F_KVNO_SPECIFIED;
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} else {
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flags |= HDB_F_ALL_KVNOS;
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}
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ent = calloc(1, sizeof (*ent));
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if (ent == NULL)
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return krb5_enomem(context);
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if (principal->name.name_type == KRB5_NT_ENTERPRISE_PRINCIPAL) {
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if (principal->name.name_string.len != 1) {
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ret = KRB5_PARSE_MALFORMED;
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krb5_set_error_message(context, ret,
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"malformed request: "
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"enterprise name with %d name components",
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principal->name.name_string.len);
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goto out;
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}
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ret = krb5_parse_name(context, principal->name.name_string.val[0],
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&enterprise_principal);
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if (ret)
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goto out;
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}
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for (i = 0; i < config->num_db; i++) {
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HDB *curdb = config->db[i];
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if (db)
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*db = curdb;
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ret = curdb->hdb_open(context, curdb, O_RDONLY, 0);
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if (ret) {
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const char *msg = krb5_get_error_message(context, ret);
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kdc_log(context, config, 0, "Failed to open database: %s", msg);
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krb5_free_error_message(context, msg);
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continue;
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}
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princ = principal;
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if (!(curdb->hdb_capability_flags & HDB_CAP_F_HANDLE_ENTERPRISE_PRINCIPAL) && enterprise_principal)
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princ = enterprise_principal;
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ret = hdb_fetch_kvno(context, curdb, princ, flags, 0, 0, kvno, ent);
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curdb->hdb_close(context, curdb);
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if (ret == HDB_ERR_NOENTRY)
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continue; /* Check the other databases */
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/*
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* This is really important, because errors like
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* HDB_ERR_NOT_FOUND_HERE (used to indicate to Samba that
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* the RODC on which this code is running does not have
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* the key we need, and so a proxy to the KDC is required)
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* have specific meaning, and need to be propogated up.
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*/
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break;
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}
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switch (ret) {
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case HDB_ERR_WRONG_REALM:
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case 0:
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/*
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* the ent->entry.principal just contains hints for the client
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* to retry. This is important for enterprise principal routing
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* between trusts.
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*/
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*h = ent;
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ent = NULL;
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break;
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case HDB_ERR_NOENTRY:
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if (db)
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*db = NULL;
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if ((flags & HDB_F_GET_CLIENT) && (flags & HDB_F_SYNTHETIC_OK) &&
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config->synthetic_clients) {
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ret = synthesize_client(context, config, principal, db, h);
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if (ret) {
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krb5_set_error_message(context, ret, "could not synthesize "
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"HDB client principal entry");
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ret = HDB_ERR_NOENTRY;
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krb5_prepend_error_message(context, ret, "no such entry found in hdb");
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}
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} else {
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krb5_set_error_message(context, ret, "no such entry found in hdb");
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}
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break;
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default:
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if (db)
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*db = NULL;
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break;
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}
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out:
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krb5_free_principal(context, enterprise_principal);
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free(ent);
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return ret;
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}
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void
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_kdc_free_ent(krb5_context context, hdb_entry_ex *ent)
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{
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hdb_free_entry (context, ent);
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free (ent);
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}
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/*
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* Use the order list of preferred encryption types and sort the
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* available keys and return the most preferred key.
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*/
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krb5_error_code
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_kdc_get_preferred_key(krb5_context context,
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krb5_kdc_configuration *config,
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hdb_entry_ex *h,
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const char *name,
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krb5_enctype *enctype,
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Key **key)
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{
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krb5_error_code ret;
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int i;
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if (config->use_strongest_server_key) {
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const krb5_enctype *p = krb5_kerberos_enctypes(context);
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for (i = 0; p[i] != (krb5_enctype)ETYPE_NULL; i++) {
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if (krb5_enctype_valid(context, p[i]) != 0 &&
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!_kdc_is_weak_exception(h->entry.principal, p[i]))
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continue;
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ret = hdb_enctype2key(context, &h->entry, NULL, p[i], key);
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if (ret != 0)
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continue;
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if (enctype != NULL)
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*enctype = p[i];
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return 0;
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}
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} else {
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*key = NULL;
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for (i = 0; i < h->entry.keys.len; i++) {
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if (krb5_enctype_valid(context, h->entry.keys.val[i].key.keytype) != 0 &&
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!_kdc_is_weak_exception(h->entry.principal, h->entry.keys.val[i].key.keytype))
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continue;
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ret = hdb_enctype2key(context, &h->entry, NULL,
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h->entry.keys.val[i].key.keytype, key);
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if (ret != 0)
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continue;
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if (enctype != NULL)
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*enctype = (*key)->key.keytype;
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return 0;
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}
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}
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krb5_set_error_message(context, EINVAL,
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"No valid kerberos key found for %s", name);
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return EINVAL; /* XXX */
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}
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krb5_error_code
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_kdc_verify_checksum(krb5_context context,
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krb5_crypto crypto,
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krb5_key_usage usage,
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const krb5_data *data,
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Checksum *cksum)
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{
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krb5_error_code ret;
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ret = krb5_verify_checksum(context, crypto, usage,
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data->data, data->length,
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cksum);
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if (ret == KRB5_PROG_SUMTYPE_NOSUPP)
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ret = KRB5KDC_ERR_SUMTYPE_NOSUPP;
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return ret;
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}
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/*
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* Returns TRUE if a PAC should be included in ticket authorization data.
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*
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* Per [MS-KILE] 3.3.5.3, PACs are always included for TGTs; for service
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* tickets, policy is governed by whether the client explicitly requested
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* a PAC be omitted when requesting a TGT, or if the no-auth-data-reqd
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* flag is set on the service principal entry.
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*/
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krb5_boolean
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_kdc_include_pac_p(astgs_request_t r)
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{
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if (krb5_principal_is_krbtgt(r->context, r->server->entry.principal))
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return TRUE;
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else if (r->server->entry.flags.no_auth_data_reqd)
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return FALSE;
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return !!(r->pac_attributes & (KRB5_PAC_WAS_REQUESTED | KRB5_PAC_WAS_GIVEN_IMPLICITLY));
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}
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/*
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* Notify the HDB backend and windc plugin of the audited event.
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*/
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krb5_error_code
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_kdc_audit_request(astgs_request_t r)
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{
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krb5_error_code ret;
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struct HDB *hdb;
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ret = _kdc_windc_audit(r);
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if (ret == 0 &&
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(hdb = r->clientdb ? r->clientdb : r->config->db[0]) &&
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hdb->hdb_audit)
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ret = hdb->hdb_audit(r->context, hdb, r->client, (hdb_request_t)r);
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return ret;
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}
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