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-rw-r--r--crypto/heimdal/kdc/krb5tgs.c1914
1 files changed, 1914 insertions, 0 deletions
diff --git a/crypto/heimdal/kdc/krb5tgs.c b/crypto/heimdal/kdc/krb5tgs.c
new file mode 100644
index 0000000..32bdee9
--- /dev/null
+++ b/crypto/heimdal/kdc/krb5tgs.c
@@ -0,0 +1,1914 @@
+/*
+ * Copyright (c) 1997-2007 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "kdc_locl.h"
+
+RCSID("$Id: krb5tgs.c 22071 2007-11-14 20:04:50Z lha $");
+
+/*
+ * return the realm of a krbtgt-ticket or NULL
+ */
+
+static Realm
+get_krbtgt_realm(const PrincipalName *p)
+{
+ if(p->name_string.len == 2
+ && strcmp(p->name_string.val[0], KRB5_TGS_NAME) == 0)
+ return p->name_string.val[1];
+ else
+ return NULL;
+}
+
+/*
+ * The KDC might add a signed path to the ticket authorization data
+ * field. This is to avoid server impersonating clients and the
+ * request constrained delegation.
+ *
+ * This is done by storing a KRB5_AUTHDATA_IF_RELEVANT with a single
+ * entry of type KRB5SignedPath.
+ */
+
+static krb5_error_code
+find_KRB5SignedPath(krb5_context context,
+ const AuthorizationData *ad,
+ krb5_data *data)
+{
+ AuthorizationData child;
+ krb5_error_code ret;
+ int pos;
+
+ if (ad == NULL || ad->len == 0)
+ return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
+
+ pos = ad->len - 1;
+
+ if (ad->val[pos].ad_type != KRB5_AUTHDATA_IF_RELEVANT)
+ return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
+
+ ret = decode_AuthorizationData(ad->val[pos].ad_data.data,
+ ad->val[pos].ad_data.length,
+ &child,
+ NULL);
+ if (ret) {
+ krb5_set_error_string(context, "Failed to decode "
+ "IF_RELEVANT with %d", ret);
+ return ret;
+ }
+
+ if (child.len != 1) {
+ free_AuthorizationData(&child);
+ return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
+ }
+
+ if (child.val[0].ad_type != KRB5_AUTHDATA_SIGNTICKET) {
+ free_AuthorizationData(&child);
+ return KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
+ }
+
+ if (data)
+ ret = der_copy_octet_string(&child.val[0].ad_data, data);
+ free_AuthorizationData(&child);
+ return ret;
+}
+
+krb5_error_code
+_kdc_add_KRB5SignedPath(krb5_context context,
+ krb5_kdc_configuration *config,
+ hdb_entry_ex *krbtgt,
+ krb5_enctype enctype,
+ krb5_const_principal server,
+ KRB5SignedPathPrincipals *principals,
+ EncTicketPart *tkt)
+{
+ krb5_error_code ret;
+ KRB5SignedPath sp;
+ krb5_data data;
+ krb5_crypto crypto = NULL;
+ size_t size;
+
+ if (server && principals) {
+ ret = add_KRB5SignedPathPrincipals(principals, server);
+ if (ret)
+ return ret;
+ }
+
+ {
+ KRB5SignedPathData spd;
+
+ spd.encticket = *tkt;
+ spd.delegated = principals;
+
+ ASN1_MALLOC_ENCODE(KRB5SignedPathData, data.data, data.length,
+ &spd, &size, ret);
+ if (ret)
+ return ret;
+ if (data.length != size)
+ krb5_abortx(context, "internal asn.1 encoder error");
+ }
+
+ {
+ Key *key;
+ ret = hdb_enctype2key(context, &krbtgt->entry, enctype, &key);
+ if (ret == 0)
+ ret = krb5_crypto_init(context, &key->key, 0, &crypto);
+ if (ret) {
+ free(data.data);
+ return ret;
+ }
+ }
+
+ /*
+ * Fill in KRB5SignedPath
+ */
+
+ sp.etype = enctype;
+ sp.delegated = principals;
+
+ ret = krb5_create_checksum(context, crypto, KRB5_KU_KRB5SIGNEDPATH, 0,
+ data.data, data.length, &sp.cksum);
+ krb5_crypto_destroy(context, crypto);
+ free(data.data);
+ if (ret)
+ return ret;
+
+ ASN1_MALLOC_ENCODE(KRB5SignedPath, data.data, data.length, &sp, &size, ret);
+ free_Checksum(&sp.cksum);
+ if (ret)
+ return ret;
+ if (data.length != size)
+ krb5_abortx(context, "internal asn.1 encoder error");
+
+
+ /*
+ * Add IF-RELEVANT(KRB5SignedPath) to the last slot in
+ * authorization data field.
+ */
+
+ ret = _kdc_tkt_add_if_relevant_ad(context, tkt,
+ KRB5_AUTHDATA_SIGNTICKET, &data);
+ krb5_data_free(&data);
+
+ return ret;
+}
+
+static krb5_error_code
+check_KRB5SignedPath(krb5_context context,
+ krb5_kdc_configuration *config,
+ hdb_entry_ex *krbtgt,
+ EncTicketPart *tkt,
+ KRB5SignedPathPrincipals **delegated,
+ int require_signedpath)
+{
+ krb5_error_code ret;
+ krb5_data data;
+ krb5_crypto crypto = NULL;
+
+ *delegated = NULL;
+
+ ret = find_KRB5SignedPath(context, tkt->authorization_data, &data);
+ if (ret == 0) {
+ KRB5SignedPathData spd;
+ KRB5SignedPath sp;
+ AuthorizationData *ad;
+ size_t size;
+
+ ret = decode_KRB5SignedPath(data.data, data.length, &sp, NULL);
+ krb5_data_free(&data);
+ if (ret)
+ return ret;
+
+ spd.encticket = *tkt;
+ /* the KRB5SignedPath is the last entry */
+ ad = spd.encticket.authorization_data;
+ if (--ad->len == 0)
+ spd.encticket.authorization_data = NULL;
+ spd.delegated = sp.delegated;
+
+ ASN1_MALLOC_ENCODE(KRB5SignedPathData, data.data, data.length,
+ &spd, &size, ret);
+ ad->len++;
+ spd.encticket.authorization_data = ad;
+ if (ret) {
+ free_KRB5SignedPath(&sp);
+ return ret;
+ }
+ if (data.length != size)
+ krb5_abortx(context, "internal asn.1 encoder error");
+
+ {
+ Key *key;
+ ret = hdb_enctype2key(context, &krbtgt->entry, sp.etype, &key);
+ if (ret == 0)
+ ret = krb5_crypto_init(context, &key->key, 0, &crypto);
+ if (ret) {
+ free(data.data);
+ free_KRB5SignedPath(&sp);
+ return ret;
+ }
+ }
+ ret = krb5_verify_checksum(context, crypto, KRB5_KU_KRB5SIGNEDPATH,
+ data.data, data.length,
+ &sp.cksum);
+ krb5_crypto_destroy(context, crypto);
+ free(data.data);
+ if (ret) {
+ free_KRB5SignedPath(&sp);
+ return ret;
+ }
+
+ if (sp.delegated) {
+
+ *delegated = malloc(sizeof(*sp.delegated));
+ if (*delegated == NULL) {
+ free_KRB5SignedPath(&sp);
+ return ENOMEM;
+ }
+
+ ret = copy_KRB5SignedPathPrincipals(*delegated, sp.delegated);
+ if (ret) {
+ free_KRB5SignedPath(&sp);
+ free(*delegated);
+ *delegated = NULL;
+ return ret;
+ }
+ }
+ free_KRB5SignedPath(&sp);
+
+ } else {
+ if (require_signedpath)
+ return KRB5KDC_ERR_BADOPTION;
+ }
+
+ return 0;
+}
+
+/*
+ *
+ */
+
+static krb5_error_code
+check_PAC(krb5_context context,
+ krb5_kdc_configuration *config,
+ const krb5_principal client_principal,
+ hdb_entry_ex *client,
+ hdb_entry_ex *server,
+ const EncryptionKey *server_key,
+ const EncryptionKey *krbtgt_key,
+ EncTicketPart *tkt,
+ krb5_data *rspac,
+ int *require_signedpath)
+{
+ AuthorizationData *ad = tkt->authorization_data;
+ unsigned i, j;
+ krb5_error_code ret;
+
+ if (ad == NULL || ad->len == 0)
+ return 0;
+
+ for (i = 0; i < ad->len; i++) {
+ AuthorizationData child;
+
+ if (ad->val[i].ad_type != KRB5_AUTHDATA_IF_RELEVANT)
+ continue;
+
+ ret = decode_AuthorizationData(ad->val[i].ad_data.data,
+ ad->val[i].ad_data.length,
+ &child,
+ NULL);
+ if (ret) {
+ krb5_set_error_string(context, "Failed to decode "
+ "IF_RELEVANT with %d", ret);
+ return ret;
+ }
+ for (j = 0; j < child.len; j++) {
+
+ if (child.val[j].ad_type == KRB5_AUTHDATA_WIN2K_PAC) {
+ krb5_pac pac;
+
+ /* Found PAC */
+ ret = krb5_pac_parse(context,
+ child.val[j].ad_data.data,
+ child.val[j].ad_data.length,
+ &pac);
+ free_AuthorizationData(&child);
+ if (ret)
+ return ret;
+
+ ret = krb5_pac_verify(context, pac, tkt->authtime,
+ client_principal,
+ krbtgt_key, NULL);
+ if (ret) {
+ krb5_pac_free(context, pac);
+ return ret;
+ }
+
+ ret = _kdc_pac_verify(context, client_principal,
+ client, server, &pac);
+ if (ret) {
+ krb5_pac_free(context, pac);
+ return ret;
+ }
+ *require_signedpath = 0;
+
+ ret = _krb5_pac_sign(context, pac, tkt->authtime,
+ client_principal,
+ server_key, krbtgt_key, rspac);
+
+ krb5_pac_free(context, pac);
+
+ return ret;
+ }
+ }
+ free_AuthorizationData(&child);
+ }
+ return 0;
+}
+
+/*
+ *
+ */
+
+static krb5_error_code
+check_tgs_flags(krb5_context context,
+ krb5_kdc_configuration *config,
+ KDC_REQ_BODY *b, const EncTicketPart *tgt, EncTicketPart *et)
+{
+ KDCOptions f = b->kdc_options;
+
+ if(f.validate){
+ if(!tgt->flags.invalid || tgt->starttime == NULL){
+ kdc_log(context, config, 0,
+ "Bad request to validate ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ if(*tgt->starttime > kdc_time){
+ kdc_log(context, config, 0,
+ "Early request to validate ticket");
+ return KRB5KRB_AP_ERR_TKT_NYV;
+ }
+ /* XXX tkt = tgt */
+ et->flags.invalid = 0;
+ }else if(tgt->flags.invalid){
+ kdc_log(context, config, 0,
+ "Ticket-granting ticket has INVALID flag set");
+ return KRB5KRB_AP_ERR_TKT_INVALID;
+ }
+
+ if(f.forwardable){
+ if(!tgt->flags.forwardable){
+ kdc_log(context, config, 0,
+ "Bad request for forwardable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ et->flags.forwardable = 1;
+ }
+ if(f.forwarded){
+ if(!tgt->flags.forwardable){
+ kdc_log(context, config, 0,
+ "Request to forward non-forwardable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ et->flags.forwarded = 1;
+ et->caddr = b->addresses;
+ }
+ if(tgt->flags.forwarded)
+ et->flags.forwarded = 1;
+
+ if(f.proxiable){
+ if(!tgt->flags.proxiable){
+ kdc_log(context, config, 0,
+ "Bad request for proxiable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ et->flags.proxiable = 1;
+ }
+ if(f.proxy){
+ if(!tgt->flags.proxiable){
+ kdc_log(context, config, 0,
+ "Request to proxy non-proxiable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ et->flags.proxy = 1;
+ et->caddr = b->addresses;
+ }
+ if(tgt->flags.proxy)
+ et->flags.proxy = 1;
+
+ if(f.allow_postdate){
+ if(!tgt->flags.may_postdate){
+ kdc_log(context, config, 0,
+ "Bad request for post-datable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ et->flags.may_postdate = 1;
+ }
+ if(f.postdated){
+ if(!tgt->flags.may_postdate){
+ kdc_log(context, config, 0,
+ "Bad request for postdated ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ if(b->from)
+ *et->starttime = *b->from;
+ et->flags.postdated = 1;
+ et->flags.invalid = 1;
+ }else if(b->from && *b->from > kdc_time + context->max_skew){
+ kdc_log(context, config, 0, "Ticket cannot be postdated");
+ return KRB5KDC_ERR_CANNOT_POSTDATE;
+ }
+
+ if(f.renewable){
+ if(!tgt->flags.renewable){
+ kdc_log(context, config, 0,
+ "Bad request for renewable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ et->flags.renewable = 1;
+ ALLOC(et->renew_till);
+ _kdc_fix_time(&b->rtime);
+ *et->renew_till = *b->rtime;
+ }
+ if(f.renew){
+ time_t old_life;
+ if(!tgt->flags.renewable || tgt->renew_till == NULL){
+ kdc_log(context, config, 0,
+ "Request to renew non-renewable ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+ old_life = tgt->endtime;
+ if(tgt->starttime)
+ old_life -= *tgt->starttime;
+ else
+ old_life -= tgt->authtime;
+ et->endtime = *et->starttime + old_life;
+ if (et->renew_till != NULL)
+ et->endtime = min(*et->renew_till, et->endtime);
+ }
+
+#if 0
+ /* checks for excess flags */
+ if(f.request_anonymous && !config->allow_anonymous){
+ kdc_log(context, config, 0,
+ "Request for anonymous ticket");
+ return KRB5KDC_ERR_BADOPTION;
+ }
+#endif
+ return 0;
+}
+
+/*
+ *
+ */
+
+static krb5_error_code
+check_constrained_delegation(krb5_context context,
+ krb5_kdc_configuration *config,
+ hdb_entry_ex *client,
+ krb5_const_principal server)
+{
+ const HDB_Ext_Constrained_delegation_acl *acl;
+ krb5_error_code ret;
+ int i;
+
+ ret = hdb_entry_get_ConstrainedDelegACL(&client->entry, &acl);
+ if (ret) {
+ krb5_clear_error_string(context);
+ return ret;
+ }
+
+ if (acl) {
+ for (i = 0; i < acl->len; i++) {
+ if (krb5_principal_compare(context, server, &acl->val[i]) == TRUE)
+ return 0;
+ }
+ }
+ kdc_log(context, config, 0,
+ "Bad request for constrained delegation");
+ return KRB5KDC_ERR_BADOPTION;
+}
+
+/*
+ *
+ */
+
+static krb5_error_code
+verify_flags (krb5_context context,
+ krb5_kdc_configuration *config,
+ const EncTicketPart *et,
+ const char *pstr)
+{
+ if(et->endtime < kdc_time){
+ kdc_log(context, config, 0, "Ticket expired (%s)", pstr);
+ return KRB5KRB_AP_ERR_TKT_EXPIRED;
+ }
+ if(et->flags.invalid){
+ kdc_log(context, config, 0, "Ticket not valid (%s)", pstr);
+ return KRB5KRB_AP_ERR_TKT_NYV;
+ }
+ return 0;
+}
+
+/*
+ *
+ */
+
+static krb5_error_code
+fix_transited_encoding(krb5_context context,
+ krb5_kdc_configuration *config,
+ krb5_boolean check_policy,
+ const TransitedEncoding *tr,
+ EncTicketPart *et,
+ const char *client_realm,
+ const char *server_realm,
+ const char *tgt_realm)
+{
+ krb5_error_code ret = 0;
+ char **realms, **tmp;
+ int num_realms;
+ int i;
+
+ switch (tr->tr_type) {
+ case DOMAIN_X500_COMPRESS:
+ break;
+ case 0:
+ /*
+ * Allow empty content of type 0 because that is was Microsoft
+ * generates in their TGT.
+ */
+ if (tr->contents.length == 0)
+ break;
+ kdc_log(context, config, 0,
+ "Transited type 0 with non empty content");
+ return KRB5KDC_ERR_TRTYPE_NOSUPP;
+ default:
+ kdc_log(context, config, 0,
+ "Unknown transited type: %u", tr->tr_type);
+ return KRB5KDC_ERR_TRTYPE_NOSUPP;
+ }
+
+ ret = krb5_domain_x500_decode(context,
+ tr->contents,
+ &realms,
+ &num_realms,
+ client_realm,
+ server_realm);
+ if(ret){
+ krb5_warn(context, ret,
+ "Decoding transited encoding");
+ return ret;
+ }
+ if(strcmp(client_realm, tgt_realm) && strcmp(server_realm, tgt_realm)) {
+ /* not us, so add the previous realm to transited set */
+ if (num_realms < 0 || num_realms + 1 > UINT_MAX/sizeof(*realms)) {
+ ret = ERANGE;
+ goto free_realms;
+ }
+ tmp = realloc(realms, (num_realms + 1) * sizeof(*realms));
+ if(tmp == NULL){
+ ret = ENOMEM;
+ goto free_realms;
+ }
+ realms = tmp;
+ realms[num_realms] = strdup(tgt_realm);
+ if(realms[num_realms] == NULL){
+ ret = ENOMEM;
+ goto free_realms;
+ }
+ num_realms++;
+ }
+ if(num_realms == 0) {
+ if(strcmp(client_realm, server_realm))
+ kdc_log(context, config, 0,
+ "cross-realm %s -> %s", client_realm, server_realm);
+ } else {
+ size_t l = 0;
+ char *rs;
+ for(i = 0; i < num_realms; i++)
+ l += strlen(realms[i]) + 2;
+ rs = malloc(l);
+ if(rs != NULL) {
+ *rs = '\0';
+ for(i = 0; i < num_realms; i++) {
+ if(i > 0)
+ strlcat(rs, ", ", l);
+ strlcat(rs, realms[i], l);
+ }
+ kdc_log(context, config, 0,
+ "cross-realm %s -> %s via [%s]",
+ client_realm, server_realm, rs);
+ free(rs);
+ }
+ }
+ if(check_policy) {
+ ret = krb5_check_transited(context, client_realm,
+ server_realm,
+ realms, num_realms, NULL);
+ if(ret) {
+ krb5_warn(context, ret, "cross-realm %s -> %s",
+ client_realm, server_realm);
+ goto free_realms;
+ }
+ et->flags.transited_policy_checked = 1;
+ }
+ et->transited.tr_type = DOMAIN_X500_COMPRESS;
+ ret = krb5_domain_x500_encode(realms, num_realms, &et->transited.contents);
+ if(ret)
+ krb5_warn(context, ret, "Encoding transited encoding");
+ free_realms:
+ for(i = 0; i < num_realms; i++)
+ free(realms[i]);
+ free(realms);
+ return ret;
+}
+
+
+static krb5_error_code
+tgs_make_reply(krb5_context context,
+ krb5_kdc_configuration *config,
+ KDC_REQ_BODY *b,
+ krb5_const_principal tgt_name,
+ const EncTicketPart *tgt,
+ const EncryptionKey *serverkey,
+ const krb5_keyblock *sessionkey,
+ krb5_kvno kvno,
+ AuthorizationData *auth_data,
+ hdb_entry_ex *server,
+ const char *server_name,
+ hdb_entry_ex *client,
+ krb5_principal client_principal,
+ hdb_entry_ex *krbtgt,
+ krb5_enctype krbtgt_etype,
+ KRB5SignedPathPrincipals *spp,
+ const krb5_data *rspac,
+ const char **e_text,
+ krb5_data *reply)
+{
+ KDC_REP rep;
+ EncKDCRepPart ek;
+ EncTicketPart et;
+ KDCOptions f = b->kdc_options;
+ krb5_error_code ret;
+
+ memset(&rep, 0, sizeof(rep));
+ memset(&et, 0, sizeof(et));
+ memset(&ek, 0, sizeof(ek));
+
+ rep.pvno = 5;
+ rep.msg_type = krb_tgs_rep;
+
+ et.authtime = tgt->authtime;
+ _kdc_fix_time(&b->till);
+ et.endtime = min(tgt->endtime, *b->till);
+ ALLOC(et.starttime);
+ *et.starttime = kdc_time;
+
+ ret = check_tgs_flags(context, config, b, tgt, &et);
+ if(ret)
+ goto out;
+
+ /* We should check the transited encoding if:
+ 1) the request doesn't ask not to be checked
+ 2) globally enforcing a check
+ 3) principal requires checking
+ 4) we allow non-check per-principal, but principal isn't marked as allowing this
+ 5) we don't globally allow this
+ */
+
+#define GLOBAL_FORCE_TRANSITED_CHECK \
+ (config->trpolicy == TRPOLICY_ALWAYS_CHECK)
+#define GLOBAL_ALLOW_PER_PRINCIPAL \
+ (config->trpolicy == TRPOLICY_ALLOW_PER_PRINCIPAL)
+#define GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK \
+ (config->trpolicy == TRPOLICY_ALWAYS_HONOUR_REQUEST)
+
+/* these will consult the database in future release */
+#define PRINCIPAL_FORCE_TRANSITED_CHECK(P) 0
+#define PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(P) 0
+
+ ret = fix_transited_encoding(context, config,
+ !f.disable_transited_check ||
+ GLOBAL_FORCE_TRANSITED_CHECK ||
+ PRINCIPAL_FORCE_TRANSITED_CHECK(server) ||
+ !((GLOBAL_ALLOW_PER_PRINCIPAL &&
+ PRINCIPAL_ALLOW_DISABLE_TRANSITED_CHECK(server)) ||
+ GLOBAL_ALLOW_DISABLE_TRANSITED_CHECK),
+ &tgt->transited, &et,
+ *krb5_princ_realm(context, client_principal),
+ *krb5_princ_realm(context, server->entry.principal),
+ *krb5_princ_realm(context, krbtgt->entry.principal));
+ if(ret)
+ goto out;
+
+ copy_Realm(krb5_princ_realm(context, server->entry.principal),
+ &rep.ticket.realm);
+ _krb5_principal2principalname(&rep.ticket.sname, server->entry.principal);
+ copy_Realm(&tgt_name->realm, &rep.crealm);
+/*
+ if (f.request_anonymous)
+ _kdc_make_anonymous_principalname (&rep.cname);
+ else */
+
+ copy_PrincipalName(&tgt_name->name, &rep.cname);
+ rep.ticket.tkt_vno = 5;
+
+ ek.caddr = et.caddr;
+ if(et.caddr == NULL)
+ et.caddr = tgt->caddr;
+
+ {
+ time_t life;
+ life = et.endtime - *et.starttime;
+ if(client && client->entry.max_life)
+ life = min(life, *client->entry.max_life);
+ if(server->entry.max_life)
+ life = min(life, *server->entry.max_life);
+ et.endtime = *et.starttime + life;
+ }
+ if(f.renewable_ok && tgt->flags.renewable &&
+ et.renew_till == NULL && et.endtime < *b->till){
+ et.flags.renewable = 1;
+ ALLOC(et.renew_till);
+ *et.renew_till = *b->till;
+ }
+ if(et.renew_till){
+ time_t renew;
+ renew = *et.renew_till - et.authtime;
+ if(client && client->entry.max_renew)
+ renew = min(renew, *client->entry.max_renew);
+ if(server->entry.max_renew)
+ renew = min(renew, *server->entry.max_renew);
+ *et.renew_till = et.authtime + renew;
+ }
+
+ if(et.renew_till){
+ *et.renew_till = min(*et.renew_till, *tgt->renew_till);
+ *et.starttime = min(*et.starttime, *et.renew_till);
+ et.endtime = min(et.endtime, *et.renew_till);
+ }
+
+ *et.starttime = min(*et.starttime, et.endtime);
+
+ if(*et.starttime == et.endtime){
+ ret = KRB5KDC_ERR_NEVER_VALID;
+ goto out;
+ }
+ if(et.renew_till && et.endtime == *et.renew_till){
+ free(et.renew_till);
+ et.renew_till = NULL;
+ et.flags.renewable = 0;
+ }
+
+ et.flags.pre_authent = tgt->flags.pre_authent;
+ et.flags.hw_authent = tgt->flags.hw_authent;
+ et.flags.anonymous = tgt->flags.anonymous;
+ et.flags.ok_as_delegate = server->entry.flags.ok_as_delegate;
+
+ if (auth_data) {
+ /* XXX Check enc-authorization-data */
+ et.authorization_data = calloc(1, sizeof(*et.authorization_data));
+ if (et.authorization_data == NULL) {
+ ret = ENOMEM;
+ goto out;
+ }
+ ret = copy_AuthorizationData(auth_data, et.authorization_data);
+ if (ret)
+ goto out;
+
+ /* Filter out type KRB5SignedPath */
+ ret = find_KRB5SignedPath(context, et.authorization_data, NULL);
+ if (ret == 0) {
+ if (et.authorization_data->len == 1) {
+ free_AuthorizationData(et.authorization_data);
+ free(et.authorization_data);
+ et.authorization_data = NULL;
+ } else {
+ AuthorizationData *ad = et.authorization_data;
+ free_AuthorizationDataElement(&ad->val[ad->len - 1]);
+ ad->len--;
+ }
+ }
+ }
+
+ if(rspac->length) {
+ /*
+ * No not need to filter out the any PAC from the
+ * auth_data since it's signed by the KDC.
+ */
+ ret = _kdc_tkt_add_if_relevant_ad(context, &et,
+ KRB5_AUTHDATA_WIN2K_PAC,
+ rspac);
+ if (ret)
+ goto out;
+ }
+
+ ret = krb5_copy_keyblock_contents(context, sessionkey, &et.key);
+ if (ret)
+ goto out;
+ et.crealm = tgt->crealm;
+ et.cname = tgt_name->name;
+
+ ek.key = et.key;
+ /* MIT must have at least one last_req */
+ ek.last_req.len = 1;
+ ek.last_req.val = calloc(1, sizeof(*ek.last_req.val));
+ if (ek.last_req.val == NULL) {
+ ret = ENOMEM;
+ goto out;
+ }
+ ek.nonce = b->nonce;
+ ek.flags = et.flags;
+ ek.authtime = et.authtime;
+ ek.starttime = et.starttime;
+ ek.endtime = et.endtime;
+ ek.renew_till = et.renew_till;
+ ek.srealm = rep.ticket.realm;
+ ek.sname = rep.ticket.sname;
+
+ _kdc_log_timestamp(context, config, "TGS-REQ", et.authtime, et.starttime,
+ et.endtime, et.renew_till);
+
+ /* Don't sign cross realm tickets, they can't be checked anyway */
+ {
+ char *r = get_krbtgt_realm(&ek.sname);
+
+ if (r == NULL || strcmp(r, ek.srealm) == 0) {
+ ret = _kdc_add_KRB5SignedPath(context,
+ config,
+ krbtgt,
+ krbtgt_etype,
+ NULL,
+ spp,
+ &et);
+ if (ret)
+ goto out;
+ }
+ }
+
+ /* It is somewhat unclear where the etype in the following
+ encryption should come from. What we have is a session
+ key in the passed tgt, and a list of preferred etypes
+ *for the new ticket*. Should we pick the best possible
+ etype, given the keytype in the tgt, or should we look
+ at the etype list here as well? What if the tgt
+ session key is DES3 and we want a ticket with a (say)
+ CAST session key. Should the DES3 etype be added to the
+ etype list, even if we don't want a session key with
+ DES3? */
+ ret = _kdc_encode_reply(context, config,
+ &rep, &et, &ek, et.key.keytype,
+ kvno,
+ serverkey, 0, &tgt->key, e_text, reply);
+out:
+ free_TGS_REP(&rep);
+ free_TransitedEncoding(&et.transited);
+ if(et.starttime)
+ free(et.starttime);
+ if(et.renew_till)
+ free(et.renew_till);
+ if(et.authorization_data) {
+ free_AuthorizationData(et.authorization_data);
+ free(et.authorization_data);
+ }
+ free_LastReq(&ek.last_req);
+ memset(et.key.keyvalue.data, 0, et.key.keyvalue.length);
+ free_EncryptionKey(&et.key);
+ return ret;
+}
+
+static krb5_error_code
+tgs_check_authenticator(krb5_context context,
+ krb5_kdc_configuration *config,
+ krb5_auth_context ac,
+ KDC_REQ_BODY *b,
+ const char **e_text,
+ krb5_keyblock *key)
+{
+ krb5_authenticator auth;
+ size_t len;
+ unsigned char *buf;
+ size_t buf_size;
+ krb5_error_code ret;
+ krb5_crypto crypto;
+
+ krb5_auth_con_getauthenticator(context, ac, &auth);
+ if(auth->cksum == NULL){
+ kdc_log(context, config, 0, "No authenticator in request");
+ ret = KRB5KRB_AP_ERR_INAPP_CKSUM;
+ goto out;
+ }
+ /*
+ * according to RFC1510 it doesn't need to be keyed,
+ * but according to the latest draft it needs to.
+ */
+ if (
+#if 0
+!krb5_checksum_is_keyed(context, auth->cksum->cksumtype)
+ ||
+#endif
+ !krb5_checksum_is_collision_proof(context, auth->cksum->cksumtype)) {
+ kdc_log(context, config, 0, "Bad checksum type in authenticator: %d",
+ auth->cksum->cksumtype);
+ ret = KRB5KRB_AP_ERR_INAPP_CKSUM;
+ goto out;
+ }
+
+ /* XXX should not re-encode this */
+ ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, b, &len, ret);
+ if(ret){
+ kdc_log(context, config, 0, "Failed to encode KDC-REQ-BODY: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+ if(buf_size != len) {
+ free(buf);
+ kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
+ *e_text = "KDC internal error";
+ ret = KRB5KRB_ERR_GENERIC;
+ goto out;
+ }
+ ret = krb5_crypto_init(context, key, 0, &crypto);
+ if (ret) {
+ free(buf);
+ kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+ ret = krb5_verify_checksum(context,
+ crypto,
+ KRB5_KU_TGS_REQ_AUTH_CKSUM,
+ buf,
+ len,
+ auth->cksum);
+ free(buf);
+ krb5_crypto_destroy(context, crypto);
+ if(ret){
+ kdc_log(context, config, 0,
+ "Failed to verify authenticator checksum: %s",
+ krb5_get_err_text(context, ret));
+ }
+out:
+ free_Authenticator(auth);
+ free(auth);
+ return ret;
+}
+
+/*
+ *
+ */
+
+static const char *
+find_rpath(krb5_context context, Realm crealm, Realm srealm)
+{
+ const char *new_realm = krb5_config_get_string(context,
+ NULL,
+ "capaths",
+ crealm,
+ srealm,
+ NULL);
+ return new_realm;
+}
+
+
+static krb5_boolean
+need_referral(krb5_context context, krb5_principal server, krb5_realm **realms)
+{
+ if(server->name.name_type != KRB5_NT_SRV_INST ||
+ server->name.name_string.len != 2)
+ return FALSE;
+
+ return _krb5_get_host_realm_int(context, server->name.name_string.val[1],
+ FALSE, realms) == 0;
+}
+
+static krb5_error_code
+tgs_parse_request(krb5_context context,
+ krb5_kdc_configuration *config,
+ KDC_REQ_BODY *b,
+ const PA_DATA *tgs_req,
+ hdb_entry_ex **krbtgt,
+ krb5_enctype *krbtgt_etype,
+ krb5_ticket **ticket,
+ const char **e_text,
+ const char *from,
+ const struct sockaddr *from_addr,
+ time_t **csec,
+ int **cusec,
+ AuthorizationData **auth_data)
+{
+ krb5_ap_req ap_req;
+ krb5_error_code ret;
+ krb5_principal princ;
+ krb5_auth_context ac = NULL;
+ krb5_flags ap_req_options;
+ krb5_flags verify_ap_req_flags;
+ krb5_crypto crypto;
+ Key *tkey;
+
+ *auth_data = NULL;
+ *csec = NULL;
+ *cusec = NULL;
+
+ memset(&ap_req, 0, sizeof(ap_req));
+ ret = krb5_decode_ap_req(context, &tgs_req->padata_value, &ap_req);
+ if(ret){
+ kdc_log(context, config, 0, "Failed to decode AP-REQ: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+
+ if(!get_krbtgt_realm(&ap_req.ticket.sname)){
+ /* XXX check for ticket.sname == req.sname */
+ kdc_log(context, config, 0, "PA-DATA is not a ticket-granting ticket");
+ ret = KRB5KDC_ERR_POLICY; /* ? */
+ goto out;
+ }
+
+ _krb5_principalname2krb5_principal(context,
+ &princ,
+ ap_req.ticket.sname,
+ ap_req.ticket.realm);
+
+ ret = _kdc_db_fetch(context, config, princ, HDB_F_GET_KRBTGT, NULL, krbtgt);
+
+ if(ret) {
+ char *p;
+ ret = krb5_unparse_name(context, princ, &p);
+ if (ret != 0)
+ p = "<unparse_name failed>";
+ krb5_free_principal(context, princ);
+ kdc_log(context, config, 0,
+ "Ticket-granting ticket not found in database: %s: %s",
+ p, krb5_get_err_text(context, ret));
+ if (ret == 0)
+ free(p);
+ ret = KRB5KRB_AP_ERR_NOT_US;
+ goto out;
+ }
+
+ if(ap_req.ticket.enc_part.kvno &&
+ *ap_req.ticket.enc_part.kvno != (*krbtgt)->entry.kvno){
+ char *p;
+
+ ret = krb5_unparse_name (context, princ, &p);
+ krb5_free_principal(context, princ);
+ if (ret != 0)
+ p = "<unparse_name failed>";
+ kdc_log(context, config, 0,
+ "Ticket kvno = %d, DB kvno = %d (%s)",
+ *ap_req.ticket.enc_part.kvno,
+ (*krbtgt)->entry.kvno,
+ p);
+ if (ret == 0)
+ free (p);
+ ret = KRB5KRB_AP_ERR_BADKEYVER;
+ goto out;
+ }
+
+ *krbtgt_etype = ap_req.ticket.enc_part.etype;
+
+ ret = hdb_enctype2key(context, &(*krbtgt)->entry,
+ ap_req.ticket.enc_part.etype, &tkey);
+ if(ret){
+ char *str = NULL, *p = NULL;
+
+ krb5_enctype_to_string(context, ap_req.ticket.enc_part.etype, &str);
+ krb5_unparse_name(context, princ, &p);
+ kdc_log(context, config, 0,
+ "No server key with enctype %s found for %s",
+ str ? str : "<unknown enctype>",
+ p ? p : "<unparse_name failed>");
+ free(str);
+ free(p);
+ ret = KRB5KRB_AP_ERR_BADKEYVER;
+ goto out;
+ }
+
+ if (b->kdc_options.validate)
+ verify_ap_req_flags = KRB5_VERIFY_AP_REQ_IGNORE_INVALID;
+ else
+ verify_ap_req_flags = 0;
+
+ ret = krb5_verify_ap_req2(context,
+ &ac,
+ &ap_req,
+ princ,
+ &tkey->key,
+ verify_ap_req_flags,
+ &ap_req_options,
+ ticket,
+ KRB5_KU_TGS_REQ_AUTH);
+
+ krb5_free_principal(context, princ);
+ if(ret) {
+ kdc_log(context, config, 0, "Failed to verify AP-REQ: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+
+ {
+ krb5_authenticator auth;
+
+ ret = krb5_auth_con_getauthenticator(context, ac, &auth);
+ if (ret == 0) {
+ *csec = malloc(sizeof(**csec));
+ if (*csec == NULL) {
+ krb5_free_authenticator(context, &auth);
+ kdc_log(context, config, 0, "malloc failed");
+ goto out;
+ }
+ **csec = auth->ctime;
+ *cusec = malloc(sizeof(**cusec));
+ if (*cusec == NULL) {
+ krb5_free_authenticator(context, &auth);
+ kdc_log(context, config, 0, "malloc failed");
+ goto out;
+ }
+ **cusec = auth->cusec;
+ krb5_free_authenticator(context, &auth);
+ }
+ }
+
+ ret = tgs_check_authenticator(context, config,
+ ac, b, e_text, &(*ticket)->ticket.key);
+ if (ret) {
+ krb5_auth_con_free(context, ac);
+ goto out;
+ }
+
+ if (b->enc_authorization_data) {
+ unsigned usage = KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY;
+ krb5_keyblock *subkey;
+ krb5_data ad;
+
+ ret = krb5_auth_con_getremotesubkey(context,
+ ac,
+ &subkey);
+ if(ret){
+ krb5_auth_con_free(context, ac);
+ kdc_log(context, config, 0, "Failed to get remote subkey: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+ if(subkey == NULL){
+ usage = KRB5_KU_TGS_REQ_AUTH_DAT_SESSION;
+ ret = krb5_auth_con_getkey(context, ac, &subkey);
+ if(ret) {
+ krb5_auth_con_free(context, ac);
+ kdc_log(context, config, 0, "Failed to get session key: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+ }
+ if(subkey == NULL){
+ krb5_auth_con_free(context, ac);
+ kdc_log(context, config, 0,
+ "Failed to get key for enc-authorization-data");
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
+ goto out;
+ }
+ ret = krb5_crypto_init(context, subkey, 0, &crypto);
+ if (ret) {
+ krb5_auth_con_free(context, ac);
+ kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+ ret = krb5_decrypt_EncryptedData (context,
+ crypto,
+ usage,
+ b->enc_authorization_data,
+ &ad);
+ krb5_crypto_destroy(context, crypto);
+ if(ret){
+ krb5_auth_con_free(context, ac);
+ kdc_log(context, config, 0,
+ "Failed to decrypt enc-authorization-data");
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
+ goto out;
+ }
+ krb5_free_keyblock(context, subkey);
+ ALLOC(*auth_data);
+ if (*auth_data == NULL) {
+ krb5_auth_con_free(context, ac);
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
+ goto out;
+ }
+ ret = decode_AuthorizationData(ad.data, ad.length, *auth_data, NULL);
+ if(ret){
+ krb5_auth_con_free(context, ac);
+ free(*auth_data);
+ *auth_data = NULL;
+ kdc_log(context, config, 0, "Failed to decode authorization data");
+ ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
+ goto out;
+ }
+ }
+
+ krb5_auth_con_free(context, ac);
+
+out:
+ free_AP_REQ(&ap_req);
+
+ return ret;
+}
+
+static krb5_error_code
+tgs_build_reply(krb5_context context,
+ krb5_kdc_configuration *config,
+ KDC_REQ *req,
+ KDC_REQ_BODY *b,
+ hdb_entry_ex *krbtgt,
+ krb5_enctype krbtgt_etype,
+ krb5_ticket *ticket,
+ krb5_data *reply,
+ const char *from,
+ const char **e_text,
+ AuthorizationData *auth_data,
+ const struct sockaddr *from_addr,
+ int datagram_reply)
+{
+ krb5_error_code ret;
+ krb5_principal cp = NULL, sp = NULL;
+ krb5_principal client_principal = NULL;
+ char *spn = NULL, *cpn = NULL;
+ hdb_entry_ex *server = NULL, *client = NULL;
+ EncTicketPart *tgt = &ticket->ticket;
+ KRB5SignedPathPrincipals *spp = NULL;
+ const EncryptionKey *ekey;
+ krb5_keyblock sessionkey;
+ krb5_kvno kvno;
+ krb5_data rspac;
+ int cross_realm = 0;
+
+ PrincipalName *s;
+ Realm r;
+ int nloop = 0;
+ EncTicketPart adtkt;
+ char opt_str[128];
+ int require_signedpath = 0;
+
+ memset(&sessionkey, 0, sizeof(sessionkey));
+ memset(&adtkt, 0, sizeof(adtkt));
+ krb5_data_zero(&rspac);
+
+ s = b->sname;
+ r = b->realm;
+
+ if(b->kdc_options.enc_tkt_in_skey){
+ Ticket *t;
+ hdb_entry_ex *uu;
+ krb5_principal p;
+ Key *uukey;
+
+ if(b->additional_tickets == NULL ||
+ b->additional_tickets->len == 0){
+ ret = KRB5KDC_ERR_BADOPTION; /* ? */
+ kdc_log(context, config, 0,
+ "No second ticket present in request");
+ goto out;
+ }
+ t = &b->additional_tickets->val[0];
+ if(!get_krbtgt_realm(&t->sname)){
+ kdc_log(context, config, 0,
+ "Additional ticket is not a ticket-granting ticket");
+ ret = KRB5KDC_ERR_POLICY;
+ goto out;
+ }
+ _krb5_principalname2krb5_principal(context, &p, t->sname, t->realm);
+ ret = _kdc_db_fetch(context, config, p,
+ HDB_F_GET_CLIENT|HDB_F_GET_SERVER,
+ NULL, &uu);
+ krb5_free_principal(context, p);
+ if(ret){
+ if (ret == HDB_ERR_NOENTRY)
+ ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
+ goto out;
+ }
+ ret = hdb_enctype2key(context, &uu->entry,
+ t->enc_part.etype, &uukey);
+ if(ret){
+ _kdc_free_ent(context, uu);
+ ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
+ goto out;
+ }
+ ret = krb5_decrypt_ticket(context, t, &uukey->key, &adtkt, 0);
+ _kdc_free_ent(context, uu);
+ if(ret)
+ goto out;
+
+ ret = verify_flags(context, config, &adtkt, spn);
+ if (ret)
+ goto out;
+
+ s = &adtkt.cname;
+ r = adtkt.crealm;
+ }
+
+ _krb5_principalname2krb5_principal(context, &sp, *s, r);
+ ret = krb5_unparse_name(context, sp, &spn);
+ if (ret)
+ goto out;
+ _krb5_principalname2krb5_principal(context, &cp, tgt->cname, tgt->crealm);
+ ret = krb5_unparse_name(context, cp, &cpn);
+ if (ret)
+ goto out;
+ unparse_flags (KDCOptions2int(b->kdc_options),
+ asn1_KDCOptions_units(),
+ opt_str, sizeof(opt_str));
+ if(*opt_str)
+ kdc_log(context, config, 0,
+ "TGS-REQ %s from %s for %s [%s]",
+ cpn, from, spn, opt_str);
+ else
+ kdc_log(context, config, 0,
+ "TGS-REQ %s from %s for %s", cpn, from, spn);
+
+ /*
+ * Fetch server
+ */
+
+server_lookup:
+ ret = _kdc_db_fetch(context, config, sp, HDB_F_GET_SERVER, NULL, &server);
+
+ if(ret){
+ const char *new_rlm;
+ Realm req_rlm;
+ krb5_realm *realms;
+
+ if ((req_rlm = get_krbtgt_realm(&sp->name)) != NULL) {
+ if(nloop++ < 2) {
+ new_rlm = find_rpath(context, tgt->crealm, req_rlm);
+ if(new_rlm) {
+ kdc_log(context, config, 5, "krbtgt for realm %s "
+ "not found, trying %s",
+ req_rlm, new_rlm);
+ krb5_free_principal(context, sp);
+ free(spn);
+ krb5_make_principal(context, &sp, r,
+ KRB5_TGS_NAME, new_rlm, NULL);
+ ret = krb5_unparse_name(context, sp, &spn);
+ if (ret)
+ goto out;
+ auth_data = NULL; /* ms don't handle AD in referals */
+ goto server_lookup;
+ }
+ }
+ } else if(need_referral(context, sp, &realms)) {
+ if (strcmp(realms[0], sp->realm) != 0) {
+ kdc_log(context, config, 5,
+ "Returning a referral to realm %s for "
+ "server %s that was not found",
+ realms[0], spn);
+ krb5_free_principal(context, sp);
+ free(spn);
+ krb5_make_principal(context, &sp, r, KRB5_TGS_NAME,
+ realms[0], NULL);
+ ret = krb5_unparse_name(context, sp, &spn);
+ if (ret)
+ goto out;
+ krb5_free_host_realm(context, realms);
+ auth_data = NULL; /* ms don't handle AD in referals */
+ goto server_lookup;
+ }
+ krb5_free_host_realm(context, realms);
+ }
+ kdc_log(context, config, 0,
+ "Server not found in database: %s: %s", spn,
+ krb5_get_err_text(context, ret));
+ if (ret == HDB_ERR_NOENTRY)
+ ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
+ goto out;
+ }
+
+ ret = _kdc_db_fetch(context, config, cp, HDB_F_GET_CLIENT, NULL, &client);
+ if(ret) {
+ const char *krbtgt_realm;
+
+ /*
+ * If the client belongs to the same realm as our krbtgt, it
+ * should exist in the local database.
+ *
+ */
+
+ krbtgt_realm =
+ krb5_principal_get_comp_string(context,
+ krbtgt->entry.principal, 1);
+
+ if(strcmp(krb5_principal_get_realm(context, cp), krbtgt_realm) == 0) {
+ if (ret == HDB_ERR_NOENTRY)
+ ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
+ kdc_log(context, config, 1, "Client no longer in database: %s",
+ cpn);
+ goto out;
+ }
+
+ kdc_log(context, config, 1, "Client not found in database: %s: %s",
+ cpn, krb5_get_err_text(context, ret));
+
+ cross_realm = 1;
+ }
+
+ /*
+ * Check that service is in the same realm as the krbtgt. If it's
+ * not the same, it's someone that is using a uni-directional trust
+ * backward.
+ */
+
+ if (strcmp(krb5_principal_get_realm(context, sp),
+ krb5_principal_get_comp_string(context,
+ krbtgt->entry.principal,
+ 1)) != 0) {
+ char *tpn;
+ ret = krb5_unparse_name(context, krbtgt->entry.principal, &tpn);
+ kdc_log(context, config, 0,
+ "Request with wrong krbtgt: %s",
+ (ret == 0) ? tpn : "<unknown>");
+ if(ret == 0)
+ free(tpn);
+ ret = KRB5KRB_AP_ERR_NOT_US;
+ goto out;
+ }
+
+ /*
+ *
+ */
+
+ client_principal = cp;
+
+ if (client) {
+ const PA_DATA *sdata;
+ int i = 0;
+
+ sdata = _kdc_find_padata(req, &i, KRB5_PADATA_S4U2SELF);
+ if (sdata) {
+ krb5_crypto crypto;
+ krb5_data datack;
+ PA_S4U2Self self;
+ char *selfcpn = NULL;
+ const char *str;
+
+ ret = decode_PA_S4U2Self(sdata->padata_value.data,
+ sdata->padata_value.length,
+ &self, NULL);
+ if (ret) {
+ kdc_log(context, config, 0, "Failed to decode PA-S4U2Self");
+ goto out;
+ }
+
+ ret = _krb5_s4u2self_to_checksumdata(context, &self, &datack);
+ if (ret)
+ goto out;
+
+ ret = krb5_crypto_init(context, &tgt->key, 0, &crypto);
+ if (ret) {
+ free_PA_S4U2Self(&self);
+ krb5_data_free(&datack);
+ kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+
+ ret = krb5_verify_checksum(context,
+ crypto,
+ KRB5_KU_OTHER_CKSUM,
+ datack.data,
+ datack.length,
+ &self.cksum);
+ krb5_data_free(&datack);
+ krb5_crypto_destroy(context, crypto);
+ if (ret) {
+ free_PA_S4U2Self(&self);
+ kdc_log(context, config, 0,
+ "krb5_verify_checksum failed for S4U2Self: %s",
+ krb5_get_err_text(context, ret));
+ goto out;
+ }
+
+ ret = _krb5_principalname2krb5_principal(context,
+ &client_principal,
+ self.name,
+ self.realm);
+ free_PA_S4U2Self(&self);
+ if (ret)
+ goto out;
+
+ ret = krb5_unparse_name(context, client_principal, &selfcpn);
+ if (ret)
+ goto out;
+
+ /*
+ * Check that service doing the impersonating is
+ * requesting a ticket to it-self.
+ */
+ if (krb5_principal_compare(context, cp, sp) != TRUE) {
+ kdc_log(context, config, 0, "S4U2Self: %s is not allowed "
+ "to impersonate some other user "
+ "(tried for user %s to service %s)",
+ cpn, selfcpn, spn);
+ free(selfcpn);
+ ret = KRB5KDC_ERR_BADOPTION; /* ? */
+ goto out;
+ }
+
+ /*
+ * If the service isn't trusted for authentication to
+ * delegation, remove the forward flag.
+ */
+
+ if (client->entry.flags.trusted_for_delegation) {
+ str = "[forwardable]";
+ } else {
+ b->kdc_options.forwardable = 0;
+ str = "";
+ }
+ kdc_log(context, config, 0, "s4u2self %s impersonating %s to "
+ "service %s %s", cpn, selfcpn, spn, str);
+ free(selfcpn);
+ }
+ }
+
+ /*
+ * Constrained delegation
+ */
+
+ if (client != NULL
+ && b->additional_tickets != NULL
+ && b->additional_tickets->len != 0
+ && b->kdc_options.enc_tkt_in_skey == 0)
+ {
+ Key *clientkey;
+ Ticket *t;
+ char *str;
+
+ t = &b->additional_tickets->val[0];
+
+ ret = hdb_enctype2key(context, &client->entry,
+ t->enc_part.etype, &clientkey);
+ if(ret){
+ ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
+ goto out;
+ }
+
+ ret = krb5_decrypt_ticket(context, t, &clientkey->key, &adtkt, 0);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "failed to decrypt ticket for "
+ "constrained delegation from %s to %s ", spn, cpn);
+ goto out;
+ }
+
+ /* check that ticket is valid */
+
+ if (adtkt.flags.forwardable == 0) {
+ kdc_log(context, config, 0,
+ "Missing forwardable flag on ticket for "
+ "constrained delegation from %s to %s ", spn, cpn);
+ ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
+ goto out;
+ }
+
+ ret = check_constrained_delegation(context, config, client, sp);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "constrained delegation from %s to %s not allowed",
+ spn, cpn);
+ goto out;
+ }
+
+ ret = _krb5_principalname2krb5_principal(context,
+ &client_principal,
+ adtkt.cname,
+ adtkt.crealm);
+ if (ret)
+ goto out;
+
+ ret = krb5_unparse_name(context, client_principal, &str);
+ if (ret)
+ goto out;
+
+ ret = verify_flags(context, config, &adtkt, str);
+ if (ret) {
+ free(str);
+ goto out;
+ }
+
+ /*
+ * Check KRB5SignedPath in authorization data and add new entry to
+ * make sure servers can't fake a ticket to us.
+ */
+
+ ret = check_KRB5SignedPath(context,
+ config,
+ krbtgt,
+ &adtkt,
+ &spp,
+ 1);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "KRB5SignedPath check from service %s failed "
+ "for delegation to %s for client %s "
+ "from %s failed with %s",
+ spn, str, cpn, from, krb5_get_err_text(context, ret));
+ free(str);
+ goto out;
+ }
+
+ kdc_log(context, config, 0, "constrained delegation for %s "
+ "from %s to %s", str, cpn, spn);
+ free(str);
+
+ /*
+ * Also require that the KDC have issue the service's krbtgt
+ * used to do the request.
+ */
+ require_signedpath = 1;
+ }
+
+ /*
+ * Check flags
+ */
+
+ ret = _kdc_check_flags(context, config,
+ client, cpn,
+ server, spn,
+ FALSE);
+ if(ret)
+ goto out;
+
+ if((b->kdc_options.validate || b->kdc_options.renew) &&
+ !krb5_principal_compare(context,
+ krbtgt->entry.principal,
+ server->entry.principal)){
+ kdc_log(context, config, 0, "Inconsistent request.");
+ ret = KRB5KDC_ERR_SERVER_NOMATCH;
+ goto out;
+ }
+
+ /* check for valid set of addresses */
+ if(!_kdc_check_addresses(context, config, tgt->caddr, from_addr)) {
+ ret = KRB5KRB_AP_ERR_BADADDR;
+ kdc_log(context, config, 0, "Request from wrong address");
+ goto out;
+ }
+
+ /*
+ * Select enctype, return key and kvno.
+ */
+
+ {
+ krb5_enctype etype;
+
+ if(b->kdc_options.enc_tkt_in_skey) {
+ int i;
+ ekey = &adtkt.key;
+ for(i = 0; i < b->etype.len; i++)
+ if (b->etype.val[i] == adtkt.key.keytype)
+ break;
+ if(i == b->etype.len) {
+ krb5_clear_error_string(context);
+ return KRB5KDC_ERR_ETYPE_NOSUPP;
+ }
+ etype = b->etype.val[i];
+ kvno = 0;
+ } else {
+ Key *skey;
+
+ ret = _kdc_find_etype(context, server, b->etype.val, b->etype.len,
+ &skey, &etype);
+ if(ret) {
+ kdc_log(context, config, 0,
+ "Server (%s) has no support for etypes", spp);
+ return ret;
+ }
+ ekey = &skey->key;
+ kvno = server->entry.kvno;
+ }
+
+ ret = krb5_generate_random_keyblock(context, etype, &sessionkey);
+ if (ret)
+ goto out;
+ }
+
+ /* check PAC if not cross realm and if there is one */
+ if (!cross_realm) {
+ Key *tkey;
+
+ ret = hdb_enctype2key(context, &krbtgt->entry,
+ krbtgt_etype, &tkey);
+ if(ret) {
+ kdc_log(context, config, 0,
+ "Failed to find key for krbtgt PAC check");
+ goto out;
+ }
+
+ ret = check_PAC(context, config, client_principal,
+ client, server, ekey, &tkey->key,
+ tgt, &rspac, &require_signedpath);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "Verify PAC failed for %s (%s) from %s with %s",
+ spn, cpn, from, krb5_get_err_text(context, ret));
+ goto out;
+ }
+ }
+
+ /* also check the krbtgt for signature */
+ ret = check_KRB5SignedPath(context,
+ config,
+ krbtgt,
+ tgt,
+ &spp,
+ require_signedpath);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "KRB5SignedPath check failed for %s (%s) from %s with %s",
+ spn, cpn, from, krb5_get_err_text(context, ret));
+ goto out;
+ }
+
+ /*
+ *
+ */
+
+ ret = tgs_make_reply(context,
+ config,
+ b,
+ client_principal,
+ tgt,
+ ekey,
+ &sessionkey,
+ kvno,
+ auth_data,
+ server,
+ spn,
+ client,
+ cp,
+ krbtgt,
+ krbtgt_etype,
+ spp,
+ &rspac,
+ e_text,
+ reply);
+
+out:
+ free(spn);
+ free(cpn);
+
+ krb5_data_free(&rspac);
+ krb5_free_keyblock_contents(context, &sessionkey);
+ if(server)
+ _kdc_free_ent(context, server);
+ if(client)
+ _kdc_free_ent(context, client);
+
+ if (client_principal && client_principal != cp)
+ krb5_free_principal(context, client_principal);
+ if (cp)
+ krb5_free_principal(context, cp);
+ if (sp)
+ krb5_free_principal(context, sp);
+
+ free_EncTicketPart(&adtkt);
+
+ return ret;
+}
+
+/*
+ *
+ */
+
+krb5_error_code
+_kdc_tgs_rep(krb5_context context,
+ krb5_kdc_configuration *config,
+ KDC_REQ *req,
+ krb5_data *data,
+ const char *from,
+ struct sockaddr *from_addr,
+ int datagram_reply)
+{
+ AuthorizationData *auth_data = NULL;
+ krb5_error_code ret;
+ int i = 0;
+ const PA_DATA *tgs_req;
+
+ hdb_entry_ex *krbtgt = NULL;
+ krb5_ticket *ticket = NULL;
+ const char *e_text = NULL;
+ krb5_enctype krbtgt_etype = ETYPE_NULL;
+
+ time_t *csec = NULL;
+ int *cusec = NULL;
+
+ if(req->padata == NULL){
+ ret = KRB5KDC_ERR_PREAUTH_REQUIRED; /* XXX ??? */
+ kdc_log(context, config, 0,
+ "TGS-REQ from %s without PA-DATA", from);
+ goto out;
+ }
+
+ tgs_req = _kdc_find_padata(req, &i, KRB5_PADATA_TGS_REQ);
+
+ if(tgs_req == NULL){
+ ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
+
+ kdc_log(context, config, 0,
+ "TGS-REQ from %s without PA-TGS-REQ", from);
+ goto out;
+ }
+ ret = tgs_parse_request(context, config,
+ &req->req_body, tgs_req,
+ &krbtgt,
+ &krbtgt_etype,
+ &ticket,
+ &e_text,
+ from, from_addr,
+ &csec, &cusec,
+ &auth_data);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "Failed parsing TGS-REQ from %s", from);
+ goto out;
+ }
+
+ ret = tgs_build_reply(context,
+ config,
+ req,
+ &req->req_body,
+ krbtgt,
+ krbtgt_etype,
+ ticket,
+ data,
+ from,
+ &e_text,
+ auth_data,
+ from_addr,
+ datagram_reply);
+ if (ret) {
+ kdc_log(context, config, 0,
+ "Failed building TGS-REP to %s", from);
+ goto out;
+ }
+
+ /* */
+ if (datagram_reply && data->length > config->max_datagram_reply_length) {
+ krb5_data_free(data);
+ ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
+ e_text = "Reply packet too large";
+ }
+
+out:
+ if(ret && data->data == NULL){
+ krb5_mk_error(context,
+ ret,
+ NULL,
+ NULL,
+ NULL,
+ NULL,
+ csec,
+ cusec,
+ data);
+ }
+ free(csec);
+ free(cusec);
+ if (ticket)
+ krb5_free_ticket(context, ticket);
+ if(krbtgt)
+ _kdc_free_ent(context, krbtgt);
+
+ if (auth_data) {
+ free_AuthorizationData(auth_data);
+ free(auth_data);
+ }
+
+ return 0;
+}
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