static struct pa_info_data *
process_pa_info(krb5_context context,
const krb5_principal client,
const AS_REQ *asreq,
struct pa_info_data *paid,
METHOD_DATA *md)
{
struct pa_info_data *p = NULL;
int i;
for (i = 0; p == NULL && i < sizeof(pa_prefs)/sizeof(pa_prefs[0]); i++) {
PA_DATA *pa = find_pa_data(md, pa_prefs[i].type);
if (pa == NULL)
continue;
paid->salt.salttype = pa_prefs[i].type;
p = (*pa_prefs[i].salt_info)(context, client, asreq,
paid, &pa->padata_value);
}
return p;
}
/*ARGSUSED*/
krb5_error_code
process_tgs_req(krb5_data *pkt, const krb5_fulladdr *from,
krb5_data **response)
{
krb5_keyblock * subkey = 0;
krb5_kdc_req *request = 0;
krb5_db_entry server;
krb5_kdc_rep reply;
krb5_enc_kdc_rep_part reply_encpart;
krb5_ticket ticket_reply, *header_ticket = 0;
int st_idx = 0;
krb5_enc_tkt_part enc_tkt_reply;
krb5_transited enc_tkt_transited;
int newtransited = 0;
krb5_error_code retval = 0;
krb5_keyblock encrypting_key;
int nprincs = 0;
krb5_boolean more;
krb5_timestamp kdc_time, authtime=0;
krb5_keyblock session_key;
krb5_timestamp until, rtime;
krb5_keyblock *reply_key = NULL;
krb5_keyblock *mkey_ptr;
krb5_key_data *server_key;
char *cname = 0, *sname = 0, *altcname = 0;
krb5_last_req_entry *nolrarray[2], nolrentry;
krb5_enctype useenctype;
int errcode, errcode2;
register int i;
int firstpass = 1;
const char *status = 0;
krb5_enc_tkt_part *header_enc_tkt = NULL; /* ticket granting or evidence ticket */
krb5_db_entry client, krbtgt;
int c_nprincs = 0, k_nprincs = 0;
krb5_pa_s4u_x509_user *s4u_x509_user = NULL; /* protocol transition request */
krb5_authdata **kdc_issued_auth_data = NULL; /* auth data issued by KDC */
unsigned int c_flags = 0, s_flags = 0; /* client/server KDB flags */
char *s4u_name = NULL;
krb5_boolean is_referral, db_ref_done = FALSE;
const char *emsg = NULL;
krb5_data *tgs_1 =NULL, *server_1 = NULL;
krb5_principal krbtgt_princ;
krb5_kvno ticket_kvno = 0;
struct kdc_request_state *state = NULL;
krb5_pa_data *pa_tgs_req; /*points into request*/
krb5_data scratch;
session_key.contents = NULL;
retval = decode_krb5_tgs_req(pkt, &request);
if (retval)
return retval;
/*
* setup_server_realm() sets up the global realm-specific data pointer.
*/
if ((retval = setup_server_realm(request->server))) {
krb5_free_kdc_req(kdc_context, request);
return retval;
}
errcode = kdc_process_tgs_req(request, from, pkt, &header_ticket,
&krbtgt, &k_nprincs, &subkey, &pa_tgs_req);
if (header_ticket && header_ticket->enc_part2 &&
(errcode2 = krb5_unparse_name(kdc_context,
header_ticket->enc_part2->client,
&cname))) {
status = "UNPARSING CLIENT";
errcode = errcode2;
goto cleanup;
}
limit_string(cname);
if (errcode) {
status = "PROCESS_TGS";
goto cleanup;
}
if (!header_ticket) {
errcode = KRB5_NO_TKT_SUPPLIED; /* XXX? */
status="UNEXPECTED NULL in header_ticket";
goto cleanup;
}
errcode = kdc_make_rstate(&state);
if (errcode !=0) {
status = "making state";
goto cleanup;
}
scratch.length = pa_tgs_req->length;
scratch.data = (char *) pa_tgs_req->contents;
errcode = kdc_find_fast(&request, &scratch, subkey, header_ticket->enc_part2->session, state);
if (errcode !=0) {
status = "kdc_find_fast";
goto cleanup;
}
/*
* Pointer to the encrypted part of the header ticket, which may be
* replaced to point to the encrypted part of the evidence ticket
* if constrained delegation is used. This simplifies the number of
* special cases for constrained delegation.
*/
header_enc_tkt = header_ticket->enc_part2;
/*
* We've already dealt with the AP_REQ authentication, so we can
* use header_ticket freely. The encrypted part (if any) has been
* decrypted with the session key.
*/
/* XXX make sure server here has the proper realm...taken from AP_REQ
header? */
if (isflagset(request->kdc_options, KDC_OPT_CANONICALIZE)) {
setflag(c_flags, KRB5_KDB_FLAG_CANONICALIZE);
setflag(s_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
db_ref_done = FALSE;
ref_tgt_again:
nprincs = 1;
if ((errcode = krb5_unparse_name(kdc_context, request->server, &sname))) {
status = "UNPARSING SERVER";
goto cleanup;
}
limit_string(sname);
errcode = krb5_db_get_principal_ext(kdc_context,
request->server,
s_flags,
&server,
&nprincs,
&more);
if (errcode) {
status = "LOOKING_UP_SERVER";
nprincs = 0;
goto cleanup;
}
tgt_again:
if (more) {
status = "NON_UNIQUE_PRINCIPAL";
errcode = KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE;
goto cleanup;
} else if (nprincs != 1) {
/*
* might be a request for a TGT for some other realm; we
* should do our best to find such a TGS in this db
*/
if (firstpass ) {
if ( krb5_is_tgs_principal(request->server) == TRUE) { /* Principal is a name of krb ticket service */
if (krb5_princ_size(kdc_context, request->server) == 2) {
server_1 = krb5_princ_component(kdc_context, request->server, 1);
tgs_1 = krb5_princ_component(kdc_context, tgs_server, 1);
if (!tgs_1 || !data_eq(*server_1, *tgs_1)) {
krb5_db_free_principal(kdc_context, &server, nprincs);
find_alternate_tgs(request, &server, &more, &nprincs);
firstpass = 0;
goto tgt_again;
}
}
krb5_db_free_principal(kdc_context, &server, nprincs);
status = "UNKNOWN_SERVER";
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto cleanup;
} else if ( db_ref_done == FALSE) {
retval = prep_reprocess_req(request, &krbtgt_princ);
if (!retval) {
krb5_free_principal(kdc_context, request->server);
retval = krb5_copy_principal(kdc_context, krbtgt_princ, &(request->server));
if (!retval) {
db_ref_done = TRUE;
if (sname != NULL)
free(sname);
goto ref_tgt_again;
}
}
}
}
krb5_db_free_principal(kdc_context, &server, nprincs);
status = "UNKNOWN_SERVER";
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto cleanup;
}
if ((errcode = krb5_timeofday(kdc_context, &kdc_time))) {
status = "TIME_OF_DAY";
goto cleanup;
}
if ((retval = validate_tgs_request(request, server, header_ticket,
kdc_time, &status))) {
if (!status)
status = "UNKNOWN_REASON";
errcode = retval + ERROR_TABLE_BASE_krb5;
goto cleanup;
}
if (!is_local_principal(header_enc_tkt->client))
setflag(c_flags, KRB5_KDB_FLAG_CROSS_REALM);
is_referral = krb5_is_tgs_principal(server.princ) &&
!krb5_principal_compare(kdc_context, tgs_server, server.princ);
/* Check for protocol transition */
errcode = kdc_process_s4u2self_req(kdc_context,
request,
header_enc_tkt->client,
&server,
subkey,
header_enc_tkt->session,
kdc_time,
&s4u_x509_user,
&client,
&c_nprincs,
&status);
if (errcode)
goto cleanup;
if (s4u_x509_user != NULL)
setflag(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION);
/*
* We pick the session keytype here....
*
* Some special care needs to be taken in the user-to-user
* case, since we don't know what keytypes the application server
* which is doing user-to-user authentication can support. We
* know that it at least must be able to support the encryption
* type of the session key in the TGT, since otherwise it won't be
* able to decrypt the U2U ticket! So we use that in preference
* to anything else.
*/
useenctype = 0;
if (isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY |
KDC_OPT_CNAME_IN_ADDL_TKT)) {
krb5_keyblock * st_sealing_key;
krb5_kvno st_srv_kvno;
krb5_enctype etype;
krb5_db_entry st_client;
int st_nprincs = 0;
/*
* Get the key for the second ticket, and decrypt it.
*/
if ((errcode = kdc_get_server_key(request->second_ticket[st_idx],
c_flags,
TRUE, /* match_enctype */
&st_client,
&st_nprincs,
&st_sealing_key,
&st_srv_kvno))) {
status = "2ND_TKT_SERVER";
goto cleanup;
}
errcode = krb5_decrypt_tkt_part(kdc_context, st_sealing_key,
request->second_ticket[st_idx]);
krb5_free_keyblock(kdc_context, st_sealing_key);
if (errcode) {
status = "2ND_TKT_DECRYPT";
krb5_db_free_principal(kdc_context, &st_client, st_nprincs);
goto cleanup;
}
etype = request->second_ticket[st_idx]->enc_part2->session->enctype;
if (!krb5_c_valid_enctype(etype)) {
status = "BAD_ETYPE_IN_2ND_TKT";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
krb5_db_free_principal(kdc_context, &st_client, st_nprincs);
goto cleanup;
}
for (i = 0; i < request->nktypes; i++) {
if (request->ktype[i] == etype) {
useenctype = etype;
break;
}
}
if (isflagset(request->kdc_options, KDC_OPT_CNAME_IN_ADDL_TKT)) {
/* Do constrained delegation protocol and authorization checks */
errcode = kdc_process_s4u2proxy_req(kdc_context,
request,
request->second_ticket[st_idx]->enc_part2,
&st_client,
header_ticket->enc_part2->client,
request->server,
&status);
if (errcode)
goto cleanup;
setflag(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION);
assert(krb5_is_tgs_principal(header_ticket->server));
/* From now on, use evidence ticket as header ticket */
header_enc_tkt = request->second_ticket[st_idx]->enc_part2;
assert(c_nprincs == 0); /* assured by kdc_process_s4u2self_req() */
client = st_client;
c_nprincs = st_nprincs;
} else {
/* "client" is not used for user2user */
krb5_db_free_principal(kdc_context, &st_client, st_nprincs);
}
}
/*
* Select the keytype for the ticket session key.
*/
if ((useenctype == 0) &&
(useenctype = select_session_keytype(kdc_context, &server,
request->nktypes,
request->ktype)) == 0) {
/* unsupported ktype */
status = "BAD_ENCRYPTION_TYPE";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
goto cleanup;
}
errcode = krb5_c_make_random_key(kdc_context, useenctype, &session_key);
if (errcode) {
/* random key failed */
status = "RANDOM_KEY_FAILED";
goto cleanup;
}
authtime = header_enc_tkt->times.authtime;
if (is_referral)
ticket_reply.server = server.princ;
else
ticket_reply.server = request->server; /* XXX careful for realm... */
enc_tkt_reply.flags = 0;
enc_tkt_reply.times.starttime = 0;
if (isflagset(server.attributes, KRB5_KDB_OK_AS_DELEGATE))
setflag(enc_tkt_reply.flags, TKT_FLG_OK_AS_DELEGATE);
/*
* Fix header_ticket's starttime; if it's zero, fill in the
* authtime's value.
*/
if (!(header_enc_tkt->times.starttime))
header_enc_tkt->times.starttime = header_enc_tkt->times.authtime;
/* don't use new addresses unless forwarded, see below */
enc_tkt_reply.caddrs = header_enc_tkt->caddrs;
/* noaddrarray[0] = 0; */
reply_encpart.caddrs = 0;/* optional...don't put it in */
reply_encpart.enc_padata = NULL;
/* It should be noted that local policy may affect the */
/* processing of any of these flags. For example, some */
/* realms may refuse to issue renewable tickets */
if (isflagset(request->kdc_options, KDC_OPT_FORWARDABLE)) {
setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION)) {
/*
* If S4U2Self principal is not forwardable, then mark ticket as
* unforwardable. This behaviour matches Windows, but it is
* different to the MIT AS-REQ path, which returns an error
* (KDC_ERR_POLICY) if forwardable tickets cannot be issued.
*
* Consider this block the S4U2Self equivalent to
* validate_forwardable().
*/
if (c_nprincs &&
isflagset(client.attributes, KRB5_KDB_DISALLOW_FORWARDABLE))
clear(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
/*
* OK_TO_AUTH_AS_DELEGATE must be set on the service requesting
* S4U2Self in order for forwardable tickets to be returned.
*/
else if (!is_referral &&
!isflagset(server.attributes, KRB5_KDB_OK_TO_AUTH_AS_DELEGATE))
clear(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
}
}
if (isflagset(request->kdc_options, KDC_OPT_FORWARDED)) {
setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDED);
/* include new addresses in ticket & reply */
enc_tkt_reply.caddrs = request->addresses;
reply_encpart.caddrs = request->addresses;
}
if (isflagset(header_enc_tkt->flags, TKT_FLG_FORWARDED))
setflag(enc_tkt_reply.flags, TKT_FLG_FORWARDED);
if (isflagset(request->kdc_options, KDC_OPT_PROXIABLE))
setflag(enc_tkt_reply.flags, TKT_FLG_PROXIABLE);
if (isflagset(request->kdc_options, KDC_OPT_PROXY)) {
setflag(enc_tkt_reply.flags, TKT_FLG_PROXY);
/* include new addresses in ticket & reply */
enc_tkt_reply.caddrs = request->addresses;
reply_encpart.caddrs = request->addresses;
}
if (isflagset(request->kdc_options, KDC_OPT_ALLOW_POSTDATE))
setflag(enc_tkt_reply.flags, TKT_FLG_MAY_POSTDATE);
if (isflagset(request->kdc_options, KDC_OPT_POSTDATED)) {
setflag(enc_tkt_reply.flags, TKT_FLG_POSTDATED);
setflag(enc_tkt_reply.flags, TKT_FLG_INVALID);
enc_tkt_reply.times.starttime = request->from;
} else
enc_tkt_reply.times.starttime = kdc_time;
if (isflagset(request->kdc_options, KDC_OPT_VALIDATE)) {
assert(isflagset(c_flags, KRB5_KDB_FLAGS_S4U) == 0);
/* BEWARE of allocation hanging off of ticket & enc_part2, it belongs
to the caller */
ticket_reply = *(header_ticket);
enc_tkt_reply = *(header_ticket->enc_part2);
clear(enc_tkt_reply.flags, TKT_FLG_INVALID);
}
if (isflagset(request->kdc_options, KDC_OPT_RENEW)) {
krb5_deltat old_life;
assert(isflagset(c_flags, KRB5_KDB_FLAGS_S4U) == 0);
/* BEWARE of allocation hanging off of ticket & enc_part2, it belongs
to the caller */
ticket_reply = *(header_ticket);
enc_tkt_reply = *(header_ticket->enc_part2);
old_life = enc_tkt_reply.times.endtime - enc_tkt_reply.times.starttime;
enc_tkt_reply.times.starttime = kdc_time;
enc_tkt_reply.times.endtime =
min(header_ticket->enc_part2->times.renew_till,
kdc_time + old_life);
} else {
/* not a renew request */
enc_tkt_reply.times.starttime = kdc_time;
until = (request->till == 0) ? kdc_infinity : request->till;
enc_tkt_reply.times.endtime =
min(until, min(enc_tkt_reply.times.starttime + server.max_life,
min(enc_tkt_reply.times.starttime + max_life_for_realm,
header_enc_tkt->times.endtime)));
if (isflagset(request->kdc_options, KDC_OPT_RENEWABLE_OK) &&
(enc_tkt_reply.times.endtime < request->till) &&
isflagset(header_enc_tkt->flags, TKT_FLG_RENEWABLE)) {
setflag(request->kdc_options, KDC_OPT_RENEWABLE);
request->rtime =
min(request->till, header_enc_tkt->times.renew_till);
}
}
rtime = (request->rtime == 0) ? kdc_infinity : request->rtime;
if (isflagset(request->kdc_options, KDC_OPT_RENEWABLE)) {
/* already checked above in policy check to reject request for a
renewable ticket using a non-renewable ticket */
setflag(enc_tkt_reply.flags, TKT_FLG_RENEWABLE);
enc_tkt_reply.times.renew_till =
min(rtime,
min(header_enc_tkt->times.renew_till,
enc_tkt_reply.times.starttime +
min(server.max_renewable_life,
max_renewable_life_for_realm)));
} else {
enc_tkt_reply.times.renew_till = 0;
}
/*
* Set authtime to be the same as header_ticket's
*/
enc_tkt_reply.times.authtime = header_enc_tkt->times.authtime;
/*
* Propagate the preauthentication flags through to the returned ticket.
*/
if (isflagset(header_enc_tkt->flags, TKT_FLG_PRE_AUTH))
setflag(enc_tkt_reply.flags, TKT_FLG_PRE_AUTH);
if (isflagset(header_enc_tkt->flags, TKT_FLG_HW_AUTH))
setflag(enc_tkt_reply.flags, TKT_FLG_HW_AUTH);
/* starttime is optional, and treated as authtime if not present.
so we can nuke it if it matches */
if (enc_tkt_reply.times.starttime == enc_tkt_reply.times.authtime)
enc_tkt_reply.times.starttime = 0;
if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION)) {
errcode = krb5_unparse_name(kdc_context, s4u_x509_user->user_id.user, &s4u_name);
} else if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION)) {
errcode = krb5_unparse_name(kdc_context, header_enc_tkt->client, &s4u_name);
} else {
errcode = 0;
}
if (errcode) {
status = "UNPARSING S4U CLIENT";
goto cleanup;
}
if (isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY)) {
krb5_enc_tkt_part *t2enc = request->second_ticket[st_idx]->enc_part2;
encrypting_key = *(t2enc->session);
} else {
/*
* Find the server key
*/
if ((errcode = krb5_dbe_find_enctype(kdc_context, &server,
-1, /* ignore keytype */
-1, /* Ignore salttype */
0,/* Get highest kvno */
&server_key))) {
status = "FINDING_SERVER_KEY";
goto cleanup;
}
if ((errcode = krb5_dbe_find_mkey(kdc_context, master_keylist, &server,
&mkey_ptr))) {
krb5_keylist_node *tmp_mkey_list;
/* try refreshing master key list */
/* XXX it would nice if we had the mkvno here for optimization */
if (krb5_db_fetch_mkey_list(kdc_context, master_princ,
&master_keyblock, 0, &tmp_mkey_list) == 0) {
krb5_dbe_free_key_list(kdc_context, master_keylist);
master_keylist = tmp_mkey_list;
if ((errcode = krb5_dbe_find_mkey(kdc_context, master_keylist,
&server, &mkey_ptr))) {
status = "FINDING_MASTER_KEY";
goto cleanup;
}
} else {
status = "FINDING_MASTER_KEY";
goto cleanup;
}
}
/* convert server.key into a real key (it may be encrypted
* in the database) */
if ((errcode = krb5_dbekd_decrypt_key_data(kdc_context,
mkey_ptr,
server_key, &encrypting_key,
NULL))) {
status = "DECRYPT_SERVER_KEY";
goto cleanup;
}
}
if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION)) {
/*
* Don't allow authorization data to be disabled if constrained
* delegation is requested. We don't want to deny the server
* the ability to validate that delegation was used.
*/
clear(server.attributes, KRB5_KDB_NO_AUTH_DATA_REQUIRED);
}
if (isflagset(server.attributes, KRB5_KDB_NO_AUTH_DATA_REQUIRED) == 0) {
/*
* If we are not doing protocol transition/constrained delegation
* and there was no authorization data included, try to lookup
* the client principal as it may be mapped to a local account.
*
* Always validate authorization data for constrained delegation
* because we must validate the KDC signatures.
*/
if (!isflagset(c_flags, KRB5_KDB_FLAGS_S4U) &&
header_enc_tkt->authorization_data == NULL) {
/* Generate authorization data so we can include it in ticket */
setflag(c_flags, KRB5_KDB_FLAG_INCLUDE_PAC);
/* Map principals from foreign (possibly non-AD) realms */
setflag(c_flags, KRB5_KDB_FLAG_MAP_PRINCIPALS);
assert(c_nprincs == 0); /* should not have been looked up already */
c_nprincs = 1;
errcode = krb5_db_get_principal_ext(kdc_context,
header_enc_tkt->client,
c_flags,
&client,
&c_nprincs,
&more);
/*
* We can ignore errors because the principal may be a
* valid cross-realm principal for which we have no local
* mapping. But we do want to check that at most one entry
* was returned.
*/
if (errcode == 0 && (more || c_nprincs > 1)) {
errcode = KRB5KDC_ERR_PRINCIPAL_NOT_UNIQUE;
goto cleanup;
} else if (errcode) {
c_nprincs = 0;
}
}
}
enc_tkt_reply.authorization_data = NULL;
if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION) &&
!isflagset(c_flags, KRB5_KDB_FLAG_CROSS_REALM))
enc_tkt_reply.client = s4u_x509_user->user_id.user;
else
enc_tkt_reply.client = header_enc_tkt->client;
enc_tkt_reply.session = &session_key;
enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
enc_tkt_reply.transited.tr_contents = empty_string; /* equivalent of "" */
errcode = handle_authdata(kdc_context,
c_flags,
(c_nprincs != 0) ? &client : NULL,
&server,
(k_nprincs != 0) ? &krbtgt : NULL,
subkey != NULL ? subkey :
header_ticket->enc_part2->session,
&encrypting_key, /* U2U or server key */
pkt,
request,
s4u_x509_user ?
s4u_x509_user->user_id.user : NULL,
header_enc_tkt,
&enc_tkt_reply);
if (errcode) {
krb5_klog_syslog(LOG_INFO, "TGS_REQ : handle_authdata (%d)", errcode);
status = "HANDLE_AUTHDATA";
goto cleanup;
}
if (is_referral && isflagset(s_flags, KRB5_KDB_FLAG_CANONICALIZE)) {
errcode = return_svr_referral_data(kdc_context,
&server, &reply_encpart);
if (errcode) {
status = "KDC_RETURN_ENC_PADATA";
goto cleanup;
}
}
/*
* Only add the realm of the presented tgt to the transited list if
* it is different than the local realm (cross-realm) and it is different
* than the realm of the client (since the realm of the client is already
* implicitly part of the transited list and should not be explicitly
* listed).
*/
/* realm compare is like strcmp, but knows how to deal with these args */
if (realm_compare(header_ticket->server, tgs_server) ||
realm_compare(header_ticket->server, enc_tkt_reply.client)) {
/* tgt issued by local realm or issued by realm of client */
enc_tkt_reply.transited = header_enc_tkt->transited;
} else {
/* tgt issued by some other realm and not the realm of the client */
/* assemble new transited field into allocated storage */
if (header_enc_tkt->transited.tr_type !=
KRB5_DOMAIN_X500_COMPRESS) {
status = "BAD_TRTYPE";
errcode = KRB5KDC_ERR_TRTYPE_NOSUPP;
goto cleanup;
}
enc_tkt_transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
enc_tkt_transited.magic = 0;
enc_tkt_transited.tr_contents.magic = 0;
enc_tkt_transited.tr_contents.data = 0;
enc_tkt_transited.tr_contents.length = 0;
enc_tkt_reply.transited = enc_tkt_transited;
if ((errcode =
add_to_transited(&header_enc_tkt->transited.tr_contents,
&enc_tkt_reply.transited.tr_contents,
header_ticket->server,
enc_tkt_reply.client,
request->server))) {
status = "ADD_TR_FAIL";
goto cleanup;
}
newtransited = 1;
}
if (isflagset(c_flags, KRB5_KDB_FLAG_CROSS_REALM)) {
errcode = validate_transit_path(kdc_context, header_enc_tkt->client,
&server,
(k_nprincs != 0) ? &krbtgt : NULL);
if (errcode) {
status = "NON_TRANSITIVE";
goto cleanup;
}
}
if (!isflagset (request->kdc_options, KDC_OPT_DISABLE_TRANSITED_CHECK)) {
unsigned int tlen;
char *tdots;
errcode = kdc_check_transited_list (kdc_context,
&enc_tkt_reply.transited.tr_contents,
krb5_princ_realm (kdc_context, header_enc_tkt->client),
krb5_princ_realm (kdc_context, request->server));
tlen = enc_tkt_reply.transited.tr_contents.length;
tdots = tlen > 125 ? "..." : "";
tlen = tlen > 125 ? 125 : tlen;
if (errcode == 0) {
setflag (enc_tkt_reply.flags, TKT_FLG_TRANSIT_POLICY_CHECKED);
} else if (errcode == KRB5KRB_AP_ERR_ILL_CR_TKT)
krb5_klog_syslog (LOG_INFO,
"bad realm transit path from '%s' to '%s' "
"via '%.*s%s'",
cname ? cname : "<unknown client>",
sname ? sname : "<unknown server>",
tlen,
enc_tkt_reply.transited.tr_contents.data,
tdots);
else {
emsg = krb5_get_error_message(kdc_context, errcode);
krb5_klog_syslog (LOG_ERR,
"unexpected error checking transit from "
"'%s' to '%s' via '%.*s%s': %s",
cname ? cname : "<unknown client>",
sname ? sname : "<unknown server>",
tlen,
enc_tkt_reply.transited.tr_contents.data,
tdots, emsg);
krb5_free_error_message(kdc_context, emsg);
emsg = NULL;
}
} else
krb5_klog_syslog (LOG_INFO, "not checking transit path");
if (reject_bad_transit
&& !isflagset (enc_tkt_reply.flags, TKT_FLG_TRANSIT_POLICY_CHECKED)) {
errcode = KRB5KDC_ERR_POLICY;
status = "BAD_TRANSIT";
goto cleanup;
}
ticket_reply.enc_part2 = &enc_tkt_reply;
/*
* If we are doing user-to-user authentication, then make sure
* that the client for the second ticket matches the request
* server, and then encrypt the ticket using the session key of
* the second ticket.
*/
if (isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY)) {
/*
* Make sure the client for the second ticket matches
* requested server.
*/
krb5_enc_tkt_part *t2enc = request->second_ticket[st_idx]->enc_part2;
krb5_principal client2 = t2enc->client;
if (!krb5_principal_compare(kdc_context, request->server, client2)) {
if ((errcode = krb5_unparse_name(kdc_context, client2, &altcname)))
altcname = 0;
if (altcname != NULL)
limit_string(altcname);
errcode = KRB5KDC_ERR_SERVER_NOMATCH;
status = "2ND_TKT_MISMATCH";
goto cleanup;
}
ticket_kvno = 0;
ticket_reply.enc_part.enctype = t2enc->session->enctype;
st_idx++;
} else {
ticket_kvno = server_key->key_data_kvno;
}
errcode = krb5_encrypt_tkt_part(kdc_context, &encrypting_key,
&ticket_reply);
if (!isflagset(request->kdc_options, KDC_OPT_ENC_TKT_IN_SKEY))
krb5_free_keyblock_contents(kdc_context, &encrypting_key);
if (errcode) {
status = "TKT_ENCRYPT";
goto cleanup;
}
ticket_reply.enc_part.kvno = ticket_kvno;
/* Start assembling the response */
reply.msg_type = KRB5_TGS_REP;
reply.padata = 0;/* always */
if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION) &&
find_pa_data(request->padata, KRB5_PADATA_S4U_X509_USER) != NULL) {
errcode = kdc_make_s4u2self_rep(kdc_context,
subkey,
header_ticket->enc_part2->session,
s4u_x509_user,
&reply,
&reply_encpart);
if (errcode) {
status = "KDC_RETURN_S4U2SELF_PADATA";
goto cleanup;
}
}
reply.client = enc_tkt_reply.client;
reply.enc_part.kvno = 0;/* We are using the session key */
reply.ticket = &ticket_reply;
reply_encpart.session = &session_key;
reply_encpart.nonce = request->nonce;
/* copy the time fields EXCEPT for authtime; its location
is used for ktime */
reply_encpart.times = enc_tkt_reply.times;
reply_encpart.times.authtime = header_enc_tkt->times.authtime;
/* starttime is optional, and treated as authtime if not present.
so we can nuke it if it matches */
if (enc_tkt_reply.times.starttime == enc_tkt_reply.times.authtime)
enc_tkt_reply.times.starttime = 0;
nolrentry.lr_type = KRB5_LRQ_NONE;
nolrentry.value = 0;
nolrarray[0] = &nolrentry;
nolrarray[1] = 0;
reply_encpart.last_req = nolrarray; /* not available for TGS reqs */
reply_encpart.key_exp = 0;/* ditto */
reply_encpart.flags = enc_tkt_reply.flags;
reply_encpart.server = ticket_reply.server;
/* use the session key in the ticket, unless there's a subsession key
in the AP_REQ */
reply.enc_part.enctype = subkey ? subkey->enctype :
header_ticket->enc_part2->session->enctype;
errcode = kdc_fast_response_handle_padata(state, request, &reply,
subkey?subkey->enctype:header_ticket->enc_part2->session->enctype);
if (errcode !=0 ) {
status = "Preparing FAST padata";
goto cleanup;
}
errcode =kdc_fast_handle_reply_key(state, subkey?subkey:header_ticket->enc_part2->session, &reply_key);
if (errcode) {
status = "generating reply key";
goto cleanup;
}
errcode = krb5_encode_kdc_rep(kdc_context, KRB5_TGS_REP, &reply_encpart,
subkey ? 1 : 0,
reply_key,
&reply, response);
if (errcode) {
status = "ENCODE_KDC_REP";
} else {
status = "ISSUE";
}
memset(ticket_reply.enc_part.ciphertext.data, 0,
ticket_reply.enc_part.ciphertext.length);
free(ticket_reply.enc_part.ciphertext.data);
/* these parts are left on as a courtesy from krb5_encode_kdc_rep so we
can use them in raw form if needed. But, we don't... */
memset(reply.enc_part.ciphertext.data, 0,
reply.enc_part.ciphertext.length);
free(reply.enc_part.ciphertext.data);
cleanup:
assert(status != NULL);
if (reply_key)
krb5_free_keyblock(kdc_context, reply_key);
if (errcode)
emsg = krb5_get_error_message (kdc_context, errcode);
log_tgs_req(from, request, &reply, cname, sname, altcname, authtime,
c_flags, s4u_name, status, errcode, emsg);
if (errcode) {
krb5_free_error_message (kdc_context, emsg);
emsg = NULL;
}
if (errcode) {
int got_err = 0;
if (status == 0) {
status = krb5_get_error_message (kdc_context, errcode);
got_err = 1;
}
errcode -= ERROR_TABLE_BASE_krb5;
if (errcode < 0 || errcode > 128)
errcode = KRB_ERR_GENERIC;
retval = prepare_error_tgs(state, request, header_ticket, errcode,
nprincs ? server.princ : NULL,
response, status);
if (got_err) {
krb5_free_error_message (kdc_context, status);
status = 0;
}
}
if (header_ticket != NULL)
krb5_free_ticket(kdc_context, header_ticket);
if (request != NULL)
krb5_free_kdc_req(kdc_context, request);
if (state)
kdc_free_rstate(state);
if (cname != NULL)
free(cname);
if (sname != NULL)
free(sname);
if (nprincs != 0)
krb5_db_free_principal(kdc_context, &server, 1);
if (session_key.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &session_key);
if (newtransited)
free(enc_tkt_reply.transited.tr_contents.data);
if (k_nprincs)
krb5_db_free_principal(kdc_context, &krbtgt, k_nprincs);
if (c_nprincs)
krb5_db_free_principal(kdc_context, &client, c_nprincs);
if (s4u_x509_user != NULL)
krb5_free_pa_s4u_x509_user(kdc_context, s4u_x509_user);
if (kdc_issued_auth_data != NULL)
krb5_free_authdata(kdc_context, kdc_issued_auth_data);
if (s4u_name != NULL)
free(s4u_name);
if (subkey != NULL)
krb5_free_keyblock(kdc_context, subkey);
if (reply.padata)
krb5_free_pa_data(kdc_context, reply.padata);
if (reply_encpart.enc_padata)
krb5_free_pa_data(kdc_context, reply_encpart.enc_padata);
return retval;
}
