int main()
{
krb5_context context;
krb5_authdata **results;
krb5_authdata *container[2];
krb5_authdata **container_out;
assert(krb5_init_context(&context) == 0);
assert(krb5_merge_authdata(context, adseq1, adseq2, &results) == 0);
compare_authdata(results[0], &ad1);
compare_authdata( results[1], &ad2);
compare_authdata(results[2], &ad4);
compare_authdata( results[3], &ad3);
assert(results[4] == NULL);
krb5_free_authdata(context, results);
container[0] = &ad3;
container[1] = NULL;
assert(krb5_encode_authdata_container( context, KRB5_AUTHDATA_IF_RELEVANT, container, &container_out) == 0);
assert(krb5int_find_authdata(context,
adseq1, container_out, 22, &results) == 0);
compare_authdata(&ad1, results[0]);
compare_authdata( results[1], &ad4);
compare_authdata( results[2], &ad3);
assert( results[3] == NULL);
krb5_free_authdata(context, results);
krb5_free_authdata(context, container_out);
return 0;
}
static krb5_error_code
generate_authenticator(krb5_context context, krb5_authenticator *authent,
krb5_principal client, krb5_checksum *cksum,
krb5_key key, krb5_ui_4 seq_number,
krb5_authdata **authorization,
krb5_authdata_context ad_context,
krb5_enctype *desired_etypes,
krb5_enctype tkt_enctype)
{
krb5_error_code retval;
krb5_authdata **ext_authdata = NULL;
authent->client = client;
authent->checksum = cksum;
if (key) {
retval = krb5_k_key_keyblock(context, key, &authent->subkey);
if (retval)
return retval;
} else
authent->subkey = 0;
authent->seq_number = seq_number;
authent->authorization_data = NULL;
if (ad_context != NULL) {
retval = krb5_authdata_export_authdata(context,
ad_context,
AD_USAGE_AP_REQ,
&ext_authdata);
if (retval)
return retval;
}
if (authorization != NULL || ext_authdata != NULL) {
retval = krb5_merge_authdata(context,
authorization,
ext_authdata,
&authent->authorization_data);
if (retval) {
krb5_free_authdata(context, ext_authdata);
return retval;
}
krb5_free_authdata(context, ext_authdata);
}
/* Only send EtypeList if we prefer another enctype to tkt_enctype */
if (desired_etypes != NULL && desired_etypes[0] != tkt_enctype) {
TRACE_MK_REQ_ETYPES(context, desired_etypes);
retval = make_etype_list(context, desired_etypes, tkt_enctype,
&authent->authorization_data);
if (retval)
return retval;
}
return(krb5_us_timeofday(context, &authent->ctime, &authent->cusec));
}
/*
* Copy an authdata array, with fresh allocation.
*/
krb5_error_code KRB5_CALLCONV
krb5_merge_authdata(krb5_context context,
krb5_authdata *const *inauthdat1,
krb5_authdata * const *inauthdat2,
krb5_authdata ***outauthdat)
{
krb5_error_code retval;
krb5_authdata ** tempauthdat;
register unsigned int nelems = 0, nelems2 = 0;
*outauthdat = NULL;
if (!inauthdat1 && !inauthdat2) {
*outauthdat = 0;
return 0;
}
if (inauthdat1)
while (inauthdat1[nelems]) nelems++;
if (inauthdat2)
while (inauthdat2[nelems2]) nelems2++;
/* one more for a null terminated list */
if (!(tempauthdat = (krb5_authdata **) calloc(nelems+nelems2+1,
sizeof(*tempauthdat))))
return ENOMEM;
if (inauthdat1) {
for (nelems = 0; inauthdat1[nelems]; nelems++) {
retval = krb5int_copy_authdatum(context, inauthdat1[nelems],
&tempauthdat[nelems]);
if (retval) {
krb5_free_authdata(context, tempauthdat);
return retval;
}
}
}
if (inauthdat2) {
for (nelems2 = 0; inauthdat2[nelems2]; nelems2++) {
retval = krb5int_copy_authdatum(context, inauthdat2[nelems2],
&tempauthdat[nelems++]);
if (retval) {
krb5_free_authdata(context, tempauthdat);
return retval;
}
}
}
*outauthdat = tempauthdat;
return 0;
}
static krb5_error_code
greet_kdc_sign(krb5_context context,
krb5_enc_tkt_part *enc_tkt_reply,
krb5_const_principal tgs,
krb5_data *greeting)
{
krb5_error_code code;
krb5_authdata ad_datum, *ad_data[2], **kdc_issued = NULL;
krb5_authdata **if_relevant = NULL;
krb5_authdata **tkt_authdata;
ad_datum.ad_type = -42;
ad_datum.contents = (krb5_octet *)greeting->data;
ad_datum.length = greeting->length;
ad_data[0] = &ad_datum;
ad_data[1] = NULL;
code = krb5_make_authdata_kdc_issued(context,
enc_tkt_reply->session,
tgs,
ad_data,
&kdc_issued);
if (code != 0)
return code;
code = krb5_encode_authdata_container(context,
KRB5_AUTHDATA_IF_RELEVANT,
kdc_issued,
&if_relevant);
if (code != 0) {
krb5_free_authdata(context, kdc_issued);
return code;
}
code = krb5_merge_authdata(context,
if_relevant,
enc_tkt_reply->authorization_data,
&tkt_authdata);
if (code == 0) {
krb5_free_authdata(context, enc_tkt_reply->authorization_data);
enc_tkt_reply->authorization_data = tkt_authdata;
}
krb5_free_authdata(context, if_relevant);
krb5_free_authdata(context, kdc_issued);
return code;
}
/* Convert a JSON value to a null-terminated authdata list or to NULL. */
static int
json_to_authdata(krb5_context context, k5_json_value v,
krb5_authdata ***authdata_out)
{
k5_json_array array;
krb5_authdata **authdata = NULL;
size_t len, i;
*authdata_out = NULL;
if (k5_json_get_tid(v) == K5_JSON_TID_NULL)
return 0;
if (k5_json_get_tid(v) != K5_JSON_TID_ARRAY)
return -1;
array = v;
len = k5_json_array_length(array);
authdata = calloc(len + 1, sizeof(*authdata));
for (i = 0; i < len; i++) {
if (json_to_authdata_element(k5_json_array_get(array, i),
&authdata[i]))
goto invalid;
}
authdata[i] = NULL;
*authdata_out = authdata;
return 0;
invalid:
krb5_free_authdata(context, authdata);
return -1;
}
static krb5_error_code
verify_ad_signedpath(krb5_context context,
krb5_db_entry *krbtgt,
krb5_keyblock *krbtgt_key,
krb5_enc_tkt_part *enc_tkt_part,
krb5_principal **pdelegated,
krb5_boolean *path_is_signed)
{
krb5_error_code code;
krb5_ad_signedpath *sp = NULL;
krb5_authdata **sp_authdata = NULL;
krb5_data enc_sp;
*pdelegated = NULL;
*path_is_signed = FALSE;
code = krb5_find_authdata(context, enc_tkt_part->authorization_data, NULL,
KRB5_AUTHDATA_SIGNTICKET, &sp_authdata);
if (code != 0)
goto cleanup;
if (sp_authdata == NULL ||
sp_authdata[0]->ad_type != KRB5_AUTHDATA_SIGNTICKET ||
sp_authdata[1] != NULL)
goto cleanup;
enc_sp.data = (char *)sp_authdata[0]->contents;
enc_sp.length = sp_authdata[0]->length;
code = decode_krb5_ad_signedpath(&enc_sp, &sp);
if (code != 0) {
/* Treat an invalid signedpath authdata element as a missing one, since
* we believe MS is using the same number for something else. */
code = 0;
goto cleanup;
}
code = verify_ad_signedpath_checksum(context,
krbtgt,
krbtgt_key,
enc_tkt_part,
sp->delegated,
sp->method_data,
&sp->checksum,
path_is_signed);
if (code != 0)
goto cleanup;
if (*path_is_signed) {
*pdelegated = sp->delegated;
sp->delegated = NULL;
}
cleanup:
krb5_free_ad_signedpath(context, sp);
krb5_free_authdata(context, sp_authdata);
return code;
}
/*
* Merge authdata.
*
* If copy is FALSE, in_authdata is invalid on successful return.
* If ignore_kdc_issued is TRUE, KDC-issued authdata is not copied.
*/
static krb5_error_code
merge_authdata (krb5_context context,
krb5_authdata **in_authdata,
krb5_authdata ***out_authdata,
krb5_boolean copy,
krb5_boolean ignore_kdc_issued)
{
size_t i, j, nadata = 0;
krb5_authdata **in_copy = NULL, **authdata = *out_authdata;
krb5_error_code code;
if (in_authdata == NULL || in_authdata[0] == NULL)
return 0;
if (authdata != NULL) {
for (nadata = 0; authdata[nadata] != NULL; nadata++)
;
}
for (i = 0; in_authdata[i] != NULL; i++)
;
if (copy) {
code = krb5_copy_authdata(context, in_authdata, &in_copy);
if (code != 0)
return code;
in_authdata = in_copy;
}
authdata = realloc(authdata, (nadata + i + 1) * sizeof(krb5_authdata *));
if (authdata == NULL) {
krb5_free_authdata(context, in_copy);
return ENOMEM;
}
for (i = 0, j = 0; in_authdata[i] != NULL; i++) {
if (ignore_kdc_issued &&
is_kdc_issued_authdatum(context, in_authdata[i], 0)) {
free(in_authdata[i]->contents);
free(in_authdata[i]);
} else
authdata[nadata + j++] = in_authdata[i];
}
authdata[nadata + j] = NULL;
free(in_authdata);
if (authdata[0] == NULL) {
free(authdata);
authdata = NULL;
}
*out_authdata = authdata;
return 0;
}
/*
* Determine the starting IAKERB state for a context. If we already
* have a ticket, we may not need to do IAKERB at all.
*/
static krb5_error_code
iakerb_get_initial_state(iakerb_ctx_id_t ctx,
krb5_gss_cred_id_t cred,
krb5_gss_name_t target,
OM_uint32 time_req,
enum iakerb_state *state)
{
krb5_creds in_creds, *out_creds = NULL;
krb5_error_code code;
memset(&in_creds, 0, sizeof(in_creds));
in_creds.client = cred->name->princ;
in_creds.server = target->princ;
if (cred->name->ad_context != NULL) {
code = krb5_authdata_export_authdata(ctx->k5c,
cred->name->ad_context,
AD_USAGE_TGS_REQ,
&in_creds.authdata);
if (code != 0)
goto cleanup;
}
if (time_req != 0 && time_req != GSS_C_INDEFINITE) {
krb5_timestamp now;
code = krb5_timeofday(ctx->k5c, &now);
if (code != 0)
goto cleanup;
in_creds.times.endtime = now + time_req;
}
/* Make an AS request if we have no creds or it's time to refresh them. */
if (cred->expire == 0 || kg_cred_time_to_refresh(ctx->k5c, cred)) {
*state = IAKERB_AS_REQ;
code = 0;
goto cleanup;
}
code = krb5_get_credentials(ctx->k5c, KRB5_GC_CACHED, cred->ccache,
&in_creds, &out_creds);
if (code == KRB5_CC_NOTFOUND || code == KRB5_CC_NOT_KTYPE) {
*state = cred->have_tgt ? IAKERB_TGS_REQ : IAKERB_AS_REQ;
code = 0;
} else if (code == 0) {
*state = IAKERB_AP_REQ;
krb5_free_creds(ctx->k5c, out_creds);
}
cleanup:
krb5_free_authdata(ctx->k5c, in_creds.authdata);
return code;
}
void KRB5_CALLCONV
krb5_free_ad_kdcissued(krb5_context context, krb5_ad_kdcissued *val)
{
if (val == NULL)
return;
krb5_free_checksum_contents(context, &val->ad_checksum);
krb5_free_principal(context, val->i_principal);
krb5_free_authdata(context, val->elements);
free(val);
}
krb5_error_code KRB5_CALLCONV
krb5_copy_authenticator(krb5_context context, const krb5_authenticator *authfrom, krb5_authenticator **authto)
{
krb5_error_code retval;
krb5_authenticator *tempto;
if (!(tempto = (krb5_authenticator *)MALLOC(sizeof(*tempto))))
return ENOMEM;
#ifdef HAVE_C_STRUCTURE_ASSIGNMENT
*tempto = *authfrom;
#else
(void) memcpy(tempto, authfrom, sizeof(krb5_authenticator));
#endif
retval = krb5_copy_principal(context, authfrom->client, &tempto->client);
if (retval) {
krb5_xfree_wrap(tempto, sizeof(*tempto));
return retval;
}
if (authfrom->checksum &&
(retval = krb5_copy_checksum(context, authfrom->checksum, &tempto->checksum))) {
krb5_free_principal(context, tempto->client);
krb5_xfree_wrap(tempto, sizeof(*tempto));
return retval;
}
if (authfrom->subkey) {
retval = krb5_copy_keyblock(context, authfrom->subkey, &tempto->subkey);
if (retval) {
krb5_xfree_wrap(tempto->subkey, sizeof(krb5_keyblock));
krb5_free_checksum(context, tempto->checksum);
krb5_free_principal(context, tempto->client);
krb5_xfree_wrap(tempto, sizeof(*tempto));
return retval;
}
}
if (authfrom->authorization_data) {
retval = krb5_copy_authdata(context, authfrom->authorization_data,
&tempto->authorization_data);
if (retval) {
krb5_xfree_wrap(tempto->subkey, sizeof(krb5_keyblock));
krb5_free_checksum(context, tempto->checksum);
krb5_free_principal(context, tempto->client);
krb5_free_authdata(context, tempto->authorization_data);
krb5_xfree_wrap(tempto, sizeof(*tempto));
return retval;
}
}
*authto = tempto;
return 0;
}
static void
free_test_cred(krb5_context context)
{
krb5_free_principal(context, test_creds.client);
krb5_free_principal(context, test_creds.server);
if(test_creds.authdata) {
krb5_free_authdata(context, test_creds.authdata);
test_creds.authdata = 0;
}
}
void KRB5_CALLCONV
krb5_free_enc_tkt_part(krb5_context context, krb5_enc_tkt_part *val)
{
if (val == NULL)
return;
krb5_free_keyblock(context, val->session);
krb5_free_principal(context, val->client);
free(val->transited.tr_contents.data);
krb5_free_addresses(context, val->caddrs);
krb5_free_authdata(context, val->authorization_data);
free(val);
}
krb5_error_code KRB5_CALLCONV
krb5_copy_authenticator(krb5_context context, const krb5_authenticator *authfrom,
krb5_authenticator **authto)
{
krb5_error_code retval;
krb5_authenticator *tempto;
if (!(tempto = (krb5_authenticator *)malloc(sizeof(*tempto))))
return ENOMEM;
*tempto = *authfrom;
retval = krb5_copy_principal(context, authfrom->client, &tempto->client);
if (retval) {
free(tempto);
return retval;
}
if (authfrom->checksum &&
(retval = krb5_copy_checksum(context, authfrom->checksum, &tempto->checksum))) {
krb5_free_principal(context, tempto->client);
free(tempto);
return retval;
}
if (authfrom->subkey) {
retval = krb5_copy_keyblock(context, authfrom->subkey, &tempto->subkey);
if (retval) {
free(tempto->subkey);
krb5_free_checksum(context, tempto->checksum);
krb5_free_principal(context, tempto->client);
free(tempto);
return retval;
}
}
if (authfrom->authorization_data) {
retval = krb5_copy_authdata(context, authfrom->authorization_data,
&tempto->authorization_data);
if (retval) {
free(tempto->subkey);
krb5_free_checksum(context, tempto->checksum);
krb5_free_principal(context, tempto->client);
krb5_free_authdata(context, tempto->authorization_data);
free(tempto);
return retval;
}
}
*authto = tempto;
return 0;
}
int
main()
{
krb5_context context;
krb5_authdata **results;
krb5_authdata *container[2];
krb5_authdata **container_out;
krb5_authdata **kdci;
assert(krb5_init_context(&context) == 0);
assert(krb5_merge_authdata(context, adseq1, adseq2, &results) == 0);
compare_authdata(results[0], &ad1);
compare_authdata( results[1], &ad2);
compare_authdata(results[2], &ad4);
compare_authdata( results[3], &ad3);
assert(results[4] == NULL);
krb5_free_authdata(context, results);
container[0] = &ad3;
container[1] = NULL;
assert(krb5_encode_authdata_container( context, KRB5_AUTHDATA_IF_RELEVANT, container, &container_out) == 0);
assert(krb5_find_authdata(context, adseq1, container_out, 22,
&results) == 0);
compare_authdata(&ad1, results[0]);
compare_authdata( results[1], &ad4);
compare_authdata( results[2], &ad3);
assert( results[3] == NULL);
krb5_free_authdata(context, container_out);
assert(krb5_make_authdata_kdc_issued(context, &key, NULL, results, &kdci) == 0);
assert(krb5_verify_authdata_kdc_issued(context, &key, kdci[0], NULL, &container_out) == 0);
compare_authdata(container_out[0], results[0]);
compare_authdata(container_out[1], results[1]);
compare_authdata(container_out[2], results[2]);
krb5_free_authdata(context, kdci);
krb5_free_authdata(context, results);
krb5_free_authdata(context, container_out);
krb5_free_context(context);
return 0;
}
void KRB5_CALLCONV
krb5_free_authenticator_contents(krb5_context context, krb5_authenticator *val)
{
if (val == NULL)
return;
krb5_free_checksum(context, val->checksum);
val->checksum = 0;
krb5_free_principal(context, val->client);
val->client = 0;
krb5_free_keyblock(context, val->subkey);
val->subkey = 0;
krb5_free_authdata(context, val->authorization_data);
val->authorization_data = 0;
}
static krb5_error_code
copy_cc_array_to_authdata (krb5_context in_context,
cc_data **in_cc_array,
krb5_authdata ***out_authdata)
{
krb5_error_code err = 0;
if (in_cc_array == NULL) {
*out_authdata = NULL;
} else {
unsigned int count, i;
krb5_authdata **authdata = NULL;
/* get length of array */
for (count = 0; in_cc_array[count]; count++);
authdata = (krb5_authdata **) malloc (sizeof (*authdata) * (count + 1));
if (!authdata) { err = KRB5_CC_NOMEM; }
for (i = 0; !err && i < count; i++) {
authdata[i] = (krb5_authdata *) malloc (sizeof (krb5_authdata));
if (!authdata[i]) { err = KRB5_CC_NOMEM; }
if (!err) {
authdata[i]->contents = (krb5_octet *) malloc (sizeof (krb5_octet) *
in_cc_array[i]->length);
if (!authdata[i]->contents) { err = KRB5_CC_NOMEM; }
}
if (!err) {
authdata[i]->magic = KV5M_AUTHDATA;
authdata[i]->ad_type = in_cc_array[i]->type;
authdata[i]->length = in_cc_array[i]->length;
memcpy (authdata[i]->contents,
in_cc_array[i]->data, in_cc_array[i]->length);
}
}
if (!err) {
authdata[i] = NULL; /* terminator */
*out_authdata = authdata;
authdata = NULL;
}
if (authdata) { krb5_free_authdata (in_context, authdata); }
}
return err;
}
void
k5_free_cammac(krb5_context context, krb5_cammac *val)
{
krb5_verifier_mac **vp;
if (val == NULL)
return;
krb5_free_authdata(context, val->elements);
free_vmac(context, val->kdc_verifier);
free_vmac(context, val->svc_verifier);
for (vp = val->other_verifiers; vp != NULL && *vp != NULL; vp++)
free_vmac(context, *vp);
free(val->other_verifiers);
free(val);
}
void KRB5_CALLCONV
krb5_free_kdc_req(krb5_context context, krb5_kdc_req *val)
{
if (val == NULL)
return;
krb5_free_pa_data(context, val->padata);
krb5_free_principal(context, val->client);
krb5_free_principal(context, val->server);
free(val->ktype);
krb5_free_addresses(context, val->addresses);
free(val->authorization_data.ciphertext.data);
krb5_free_authdata(context, val->unenc_authdata);
krb5_free_tickets(context, val->second_ticket);
free(val);
}
static krb5_error_code
s4u2proxy_export_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_flags usage,
krb5_authdata ***out_authdata)
{
struct s4u2proxy_context *s4uctx = (struct s4u2proxy_context *)request_context;
krb5_error_code code;
krb5_ad_signedpath sp;
krb5_authdata **authdata;
krb5_data *data;
if (s4uctx->count == 0)
return 0;
memset(&sp, 0, sizeof(sp));
sp.delegated = s4uctx->delegated;
authdata = k5calloc(2, sizeof(krb5_authdata *), &code);
if (authdata == NULL)
return code;
authdata[0] = k5alloc(sizeof(krb5_authdata), &code);
if (authdata[0] == NULL)
return code;
code = encode_krb5_ad_signedpath(&sp, &data);
if (code != 0) {
krb5_free_authdata(kcontext, authdata);
return code;
}
authdata[0]->magic = KV5M_AUTHDATA;
authdata[0]->ad_type = KRB5_AUTHDATA_SIGNTICKET;
authdata[0]->length = data->length;
authdata[0]->contents = (krb5_octet *)data->data;
authdata[1] = NULL;
free(data);
*out_authdata = authdata;
return 0;
}
/*
* Initialise the krb5_tkt_creds context for the IAKERB context
*/
static krb5_error_code
iakerb_tkt_creds_ctx(iakerb_ctx_id_t ctx,
krb5_gss_cred_id_t cred,
krb5_gss_name_t name,
OM_uint32 time_req)
{
krb5_error_code code;
krb5_creds creds;
krb5_timestamp now;
assert(cred->name != NULL);
assert(cred->name->princ != NULL);
memset(&creds, 0, sizeof(creds));
creds.client = cred->name->princ;
creds.server = name->princ;
if (time_req != 0 && time_req != GSS_C_INDEFINITE) {
code = krb5_timeofday(ctx->k5c, &now);
if (code != 0)
goto cleanup;
creds.times.endtime = now + time_req;
}
if (cred->name->ad_context != NULL) {
code = krb5_authdata_export_authdata(ctx->k5c,
cred->name->ad_context,
AD_USAGE_TGS_REQ,
&creds.authdata);
if (code != 0)
goto cleanup;
}
code = krb5_tkt_creds_init(ctx->k5c, cred->ccache, &creds, 0, &ctx->tcc);
if (code != 0)
goto cleanup;
cleanup:
krb5_free_authdata(ctx->k5c, creds.authdata);
return code;
}
void KRB5_CALLCONV
krb5_tkt_creds_free(krb5_context context, krb5_tkt_creds_context ctx)
{
if (ctx == NULL)
return;
krb5_free_creds(context, ctx->in_creds);
krb5_cc_close(context, ctx->ccache);
krb5_free_principal(context, ctx->req_server);
krb5_free_authdata(context, ctx->authdata);
krb5_free_creds(context, ctx->cur_tgt);
krb5int_free_data_list(context, ctx->realms_seen);
krb5_free_principal(context, ctx->tgt_princ);
krb5_free_keyblock(context, ctx->subkey);
krb5_free_data_contents(context, &ctx->previous_request);
krb5int_free_data_list(context, ctx->realm_path);
krb5_free_creds(context, ctx->reply_creds);
free(ctx);
}
static krb5_error_code
mspac_export_authdata(krb5_context kcontext,
krb5_authdata_context context,
void *plugin_context,
void *request_context,
krb5_flags usage,
krb5_authdata ***out_authdata)
{
struct mspac_context *pacctx = (struct mspac_context *)request_context;
krb5_error_code code;
krb5_authdata **authdata;
krb5_data data;
if (pacctx->pac == NULL)
return 0;
authdata = calloc(2, sizeof(krb5_authdata *));
if (authdata == NULL)
return ENOMEM;
authdata[0] = calloc(1, sizeof(krb5_authdata));
if (authdata[0] == NULL) {
free(authdata);
return ENOMEM;
}
authdata[1] = NULL;
code = krb5int_copy_data_contents(kcontext, &pacctx->pac->data, &data);
if (code != 0) {
krb5_free_authdata(kcontext, authdata);
return code;
}
authdata[0]->magic = KV5M_AUTHDATA;
authdata[0]->ad_type = KRB5_AUTHDATA_WIN2K_PAC;
authdata[0]->length = data.length;
authdata[0]->contents = (krb5_octet *)data.data;
authdata[1] = NULL;
*out_authdata = authdata;
return 0;
}
void KRB5_CALLCONV
krb5_free_cred_contents(krb5_context context, krb5_creds *val)
{
if (val == NULL)
return;
krb5_free_principal(context, val->client);
val->client = 0;
krb5_free_principal(context, val->server);
val->server = 0;
krb5_free_keyblock_contents(context, &val->keyblock);
free(val->ticket.data);
val->ticket.data = 0;
free(val->second_ticket.data);
val->second_ticket.data = 0;
krb5_free_addresses(context, val->addresses);
val->addresses = 0;
krb5_free_authdata(context, val->authdata);
val->authdata = 0;
}
static krb5_error_code
k5_get_kdc_issued_authdata(krb5_context kcontext,
const krb5_ap_req *ap_req,
krb5_principal *kdc_issuer,
krb5_authdata ***kdc_issued_authdata)
{
krb5_error_code code;
krb5_authdata **authdata;
krb5_authdata **ticket_authdata;
*kdc_issuer = NULL;
*kdc_issued_authdata = NULL;
ticket_authdata = ap_req->ticket->enc_part2->authorization_data;
code = krb5int_find_authdata(kcontext,
ticket_authdata,
NULL,
KRB5_AUTHDATA_KDC_ISSUED,
&authdata);
if (code != 0 || authdata == NULL)
return code;
/*
* Note: a module must still implement a verify_authdata
* method, even it is a NOOP that simply records the value
* of the kdc_issued_flag.
*/
code = krb5_verify_authdata_kdc_issued(kcontext,
ap_req->ticket->enc_part2->session,
authdata[0],
kdc_issuer,
kdc_issued_authdata);
assert(code == 0 || *kdc_issued_authdata == NULL);
krb5_free_authdata(kcontext, authdata);
return code;
}
/*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;
}
static OM_uint32
kg_impersonate_name(OM_uint32 *minor_status,
const krb5_gss_cred_id_t impersonator_cred,
const krb5_gss_name_t user,
OM_uint32 time_req,
krb5_gss_cred_id_t *output_cred,
OM_uint32 *time_rec,
krb5_context context)
{
OM_uint32 major_status;
krb5_error_code code;
krb5_creds in_creds, *out_creds = NULL;
*output_cred = NULL;
memset(&in_creds, 0, sizeof(in_creds));
in_creds.client = user->princ;
in_creds.server = impersonator_cred->name->princ;
if (impersonator_cred->req_enctypes != NULL)
in_creds.keyblock.enctype = impersonator_cred->req_enctypes[0];
code = k5_mutex_lock(&user->lock);
if (code != 0) {
*minor_status = code;
return GSS_S_FAILURE;
}
if (user->ad_context != NULL) {
code = krb5_authdata_export_authdata(context,
user->ad_context,
AD_USAGE_TGS_REQ,
&in_creds.authdata);
if (code != 0) {
k5_mutex_unlock(&user->lock);
*minor_status = code;
return GSS_S_FAILURE;
}
}
k5_mutex_unlock(&user->lock);
code = krb5_get_credentials_for_user(context,
KRB5_GC_CANONICALIZE | KRB5_GC_NO_STORE,
impersonator_cred->ccache,
&in_creds,
NULL, &out_creds);
if (code != 0) {
krb5_free_authdata(context, in_creds.authdata);
*minor_status = code;
return GSS_S_FAILURE;
}
major_status = kg_compose_deleg_cred(minor_status,
impersonator_cred,
out_creds,
time_req,
output_cred,
time_rec,
context);
krb5_free_authdata(context, in_creds.authdata);
krb5_free_creds(context, out_creds);
return major_status;
}
static krb5_error_code
decode_etype_list(krb5_context context,
const krb5_authenticator *authp,
krb5_enctype **desired_etypes,
int *desired_etypes_len)
{
krb5_error_code code;
krb5_authdata **ad_if_relevant = NULL;
krb5_authdata *etype_adata = NULL;
krb5_etype_list *etype_list = NULL;
int i, j;
krb5_data data;
*desired_etypes = NULL;
if (authp->authorization_data == NULL)
return 0;
/*
* RFC 4537 says that ETYPE_NEGOTIATION auth data should be wrapped
* in AD_IF_RELEVANT, but we handle the case where it is mandatory.
*/
for (i = 0; authp->authorization_data[i] != NULL; i++) {
switch (authp->authorization_data[i]->ad_type) {
case KRB5_AUTHDATA_IF_RELEVANT:
code = krb5_decode_authdata_container(context,
KRB5_AUTHDATA_IF_RELEVANT,
authp->authorization_data[i],
&ad_if_relevant);
if (code != 0)
continue;
for (j = 0; ad_if_relevant[j] != NULL; j++) {
if (ad_if_relevant[j]->ad_type == KRB5_AUTHDATA_ETYPE_NEGOTIATION) {
etype_adata = ad_if_relevant[j];
break;
}
}
if (etype_adata == NULL) {
krb5_free_authdata(context, ad_if_relevant);
ad_if_relevant = NULL;
}
break;
case KRB5_AUTHDATA_ETYPE_NEGOTIATION:
etype_adata = authp->authorization_data[i];
break;
default:
break;
}
if (etype_adata != NULL)
break;
}
if (etype_adata == NULL)
return 0;
data.data = (char *)etype_adata->contents;
data.length = etype_adata->length;
code = decode_krb5_etype_list(&data, &etype_list);
if (code == 0) {
*desired_etypes = etype_list->etypes;
*desired_etypes_len = etype_list->length;
free(etype_list);
}
if (ad_if_relevant != NULL)
krb5_free_authdata(context, ad_if_relevant);
return code;
}
/*ARGSUSED*/
krb5_error_code
process_tgs_req(struct server_handle *handle, krb5_data *pkt,
const krb5_fulladdr *from, krb5_data **response)
{
krb5_keyblock * subkey = 0;
krb5_keyblock *header_key = NULL;
krb5_kdc_req *request = 0;
krb5_db_entry *server = NULL;
krb5_db_entry *stkt_server = NULL;
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;
int newtransited = 0;
krb5_error_code retval = 0;
krb5_keyblock encrypting_key;
krb5_timestamp kdc_time, authtime = 0;
krb5_keyblock session_key;
krb5_keyblock *reply_key = NULL;
krb5_key_data *server_key;
krb5_principal cprinc = NULL, sprinc = NULL, altcprinc = NULL;
krb5_last_req_entry *nolrarray[2], nolrentry;
int errcode;
const char *status = 0;
krb5_enc_tkt_part *header_enc_tkt = NULL; /* TGT */
krb5_enc_tkt_part *subject_tkt = NULL; /* TGT or evidence ticket */
krb5_db_entry *client = NULL, *header_server = NULL;
krb5_db_entry *local_tgt, *local_tgt_storage = NULL;
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 */
krb5_boolean is_referral;
const char *emsg = NULL;
krb5_kvno ticket_kvno = 0;
struct kdc_request_state *state = NULL;
krb5_pa_data *pa_tgs_req; /*points into request*/
krb5_data scratch;
krb5_pa_data **e_data = NULL;
kdc_realm_t *kdc_active_realm = NULL;
krb5_audit_state *au_state = NULL;
krb5_data **auth_indicators = NULL;
memset(&reply, 0, sizeof(reply));
memset(&reply_encpart, 0, sizeof(reply_encpart));
memset(&ticket_reply, 0, sizeof(ticket_reply));
memset(&enc_tkt_reply, 0, sizeof(enc_tkt_reply));
session_key.contents = NULL;
retval = decode_krb5_tgs_req(pkt, &request);
if (retval)
return retval;
/* Save pointer to client-requested service principal, in case of
* errors before a successful call to search_sprinc(). */
sprinc = request->server;
if (request->msg_type != KRB5_TGS_REQ) {
krb5_free_kdc_req(handle->kdc_err_context, request);
return KRB5_BADMSGTYPE;
}
/*
* setup_server_realm() sets up the global realm-specific data pointer.
*/
kdc_active_realm = setup_server_realm(handle, request->server);
if (kdc_active_realm == NULL) {
krb5_free_kdc_req(handle->kdc_err_context, request);
return KRB5KDC_ERR_WRONG_REALM;
}
errcode = kdc_make_rstate(kdc_active_realm, &state);
if (errcode !=0) {
krb5_free_kdc_req(handle->kdc_err_context, request);
return errcode;
}
/* Initialize audit state. */
errcode = kau_init_kdc_req(kdc_context, request, from, &au_state);
if (errcode) {
krb5_free_kdc_req(handle->kdc_err_context, request);
return errcode;
}
/* Seed the audit trail with the request ID and basic information. */
kau_tgs_req(kdc_context, TRUE, au_state);
errcode = kdc_process_tgs_req(kdc_active_realm,
request, from, pkt, &header_ticket,
&header_server, &header_key, &subkey,
&pa_tgs_req);
if (header_ticket && header_ticket->enc_part2)
cprinc = header_ticket->enc_part2->client;
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 = kau_make_tkt_id(kdc_context, header_ticket,
&au_state->tkt_in_id);
if (errcode) {
status = "GENERATE_TICKET_ID";
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, NULL);
/* Reset sprinc because kdc_find_fast() can replace request. */
sprinc = request->server;
if (errcode !=0) {
status = "FIND_FAST";
goto cleanup;
}
errcode = get_local_tgt(kdc_context, &sprinc->realm, header_server,
&local_tgt, &local_tgt_storage);
if (errcode) {
status = "GET_LOCAL_TGT";
goto cleanup;
}
/* Ignore (for now) the request modification due to FAST processing. */
au_state->request = request;
/*
* 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.
*/
au_state->stage = SRVC_PRINC;
/* XXX make sure server here has the proper realm...taken from AP_REQ
header? */
setflag(s_flags, KRB5_KDB_FLAG_ALIAS_OK);
if (isflagset(request->kdc_options, KDC_OPT_CANONICALIZE)) {
setflag(c_flags, KRB5_KDB_FLAG_CANONICALIZE);
setflag(s_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
errcode = search_sprinc(kdc_active_realm, request, s_flags, &server,
&status);
if (errcode != 0)
goto cleanup;
sprinc = server->princ;
/* If we got a cross-realm TGS which is not the requested server, we are
* issuing a referral (or alternate TGT, which we treat similarly). */
is_referral = is_cross_tgs_principal(server->princ) &&
!krb5_principal_compare(kdc_context, request->server, server->princ);
au_state->stage = VALIDATE_POL;
if ((errcode = krb5_timeofday(kdc_context, &kdc_time))) {
status = "TIME_OF_DAY";
goto cleanup;
}
if ((retval = validate_tgs_request(kdc_active_realm,
request, *server, header_ticket,
kdc_time, &status, &e_data))) {
if (!status)
status = "UNKNOWN_REASON";
if (retval == KDC_ERR_POLICY || retval == KDC_ERR_BADOPTION)
au_state->violation = PROT_CONSTRAINT;
errcode = retval + ERROR_TABLE_BASE_krb5;
goto cleanup;
}
if (!is_local_principal(kdc_active_realm, header_enc_tkt->client))
setflag(c_flags, KRB5_KDB_FLAG_CROSS_REALM);
/* Check for protocol transition */
errcode = kdc_process_s4u2self_req(kdc_active_realm,
request,
header_enc_tkt->client,
server,
subkey,
header_enc_tkt->session,
kdc_time,
&s4u_x509_user,
&client,
&status);
if (s4u_x509_user != NULL || errcode != 0) {
if (s4u_x509_user != NULL)
au_state->s4u2self_user = s4u_x509_user->user_id.user;
if (errcode == KDC_ERR_POLICY || errcode == KDC_ERR_BADOPTION)
au_state->violation = PROT_CONSTRAINT;
au_state->status = status;
kau_s4u2self(kdc_context, errcode ? FALSE : TRUE, au_state);
au_state->s4u2self_user = NULL;
}
if (errcode)
goto cleanup;
if (s4u_x509_user != NULL) {
setflag(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION);
if (is_referral) {
/* The requesting server appears to no longer exist, and we found
* a referral instead. Treat this as a server lookup failure. */
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
status = "LOOKING_UP_SERVER";
goto cleanup;
}
}
/* Deal with user-to-user and constrained delegation */
errcode = decrypt_2ndtkt(kdc_active_realm, request, c_flags,
&stkt_server, &status);
if (errcode)
goto cleanup;
if (isflagset(request->kdc_options, KDC_OPT_CNAME_IN_ADDL_TKT)) {
/* Do constrained delegation protocol and authorization checks */
errcode = kdc_process_s4u2proxy_req(kdc_active_realm,
request,
request->second_ticket[st_idx]->enc_part2,
stkt_server,
header_ticket->enc_part2->client,
request->server,
&status);
if (errcode == KDC_ERR_POLICY || errcode == KDC_ERR_BADOPTION)
au_state->violation = PROT_CONSTRAINT;
else if (errcode)
au_state->violation = LOCAL_POLICY;
au_state->status = status;
retval = kau_make_tkt_id(kdc_context, request->second_ticket[st_idx],
&au_state->evid_tkt_id);
if (retval) {
status = "GENERATE_TICKET_ID";
errcode = retval;
goto cleanup;
}
kau_s4u2proxy(kdc_context, errcode ? FALSE : TRUE, au_state);
if (errcode)
goto cleanup;
setflag(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION);
assert(krb5_is_tgs_principal(header_ticket->server));
assert(client == NULL); /* assured by kdc_process_s4u2self_req() */
client = stkt_server;
stkt_server = NULL;
} else if (request->kdc_options & KDC_OPT_ENC_TKT_IN_SKEY) {
krb5_db_free_principal(kdc_context, stkt_server);
stkt_server = NULL;
} else
assert(stkt_server == NULL);
au_state->stage = ISSUE_TKT;
errcode = gen_session_key(kdc_active_realm, request, server, &session_key,
&status);
if (errcode)
goto cleanup;
/*
* subject_tkt will refer to the evidence ticket (for constrained
* delegation) or the TGT. The distinction from header_enc_tkt is
* necessary because the TGS signature only protects some fields:
* the others could be forged by a malicious server.
*/
if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION))
subject_tkt = request->second_ticket[st_idx]->enc_part2;
else
subject_tkt = header_enc_tkt;
authtime = subject_tkt->times.authtime;
/* Extract auth indicators from the subject ticket, except for S4U2Proxy
* requests (where the client didn't authenticate). */
if (s4u_x509_user == NULL) {
errcode = get_auth_indicators(kdc_context, subject_tkt, local_tgt,
&auth_indicators);
if (errcode) {
status = "GET_AUTH_INDICATORS";
goto cleanup;
}
}
errcode = check_indicators(kdc_context, server, auth_indicators);
if (errcode) {
status = "HIGHER_AUTHENTICATION_REQUIRED";
goto cleanup;
}
if (is_referral)
ticket_reply.server = server->princ;
else
ticket_reply.server = request->server; /* XXX careful for realm... */
enc_tkt_reply.flags = OPTS2FLAGS(request->kdc_options);
enc_tkt_reply.flags |= COPY_TKT_FLAGS(header_enc_tkt->flags);
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);
/* Indicate support for encrypted padata (RFC 6806). */
setflag(enc_tkt_reply.flags, TKT_FLG_ENC_PA_REP);
/* 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)) {
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 (client != NULL &&
isflagset(client->attributes, KRB5_KDB_DISALLOW_FORWARDABLE))
clear(enc_tkt_reply.flags, TKT_FLG_FORWARDABLE);
/*
* Forwardable flag is propagated along referral path.
*/
else if (!isflagset(header_enc_tkt->flags, TKT_FLG_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) ||
isflagset(request->kdc_options, KDC_OPT_PROXY)) {
/* include new addresses in ticket & reply */
enc_tkt_reply.caddrs = request->addresses;
reply_encpart.caddrs = request->addresses;
}
/* We don't currently handle issuing anonymous tickets based on
* non-anonymous ones, so just ignore the option. */
if (isflagset(request->kdc_options, KDC_OPT_REQUEST_ANONYMOUS) &&
!isflagset(header_enc_tkt->flags, TKT_FLG_ANONYMOUS))
clear(enc_tkt_reply.flags, TKT_FLG_ANONYMOUS);
if (isflagset(request->kdc_options, KDC_OPT_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);
enc_tkt_reply.authorization_data = NULL;
clear(enc_tkt_reply.flags, TKT_FLG_INVALID);
}
if (isflagset(request->kdc_options, KDC_OPT_RENEW)) {
krb5_timestamp old_starttime;
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);
enc_tkt_reply.authorization_data = NULL;
old_starttime = enc_tkt_reply.times.starttime ?
enc_tkt_reply.times.starttime : enc_tkt_reply.times.authtime;
old_life = enc_tkt_reply.times.endtime - old_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;
kdc_get_ticket_endtime(kdc_active_realm, enc_tkt_reply.times.starttime,
header_enc_tkt->times.endtime, request->till,
client, server, &enc_tkt_reply.times.endtime);
}
kdc_get_ticket_renewtime(kdc_active_realm, request, header_enc_tkt, client,
server, &enc_tkt_reply);
/*
* Set authtime to be the same as header or evidence ticket's
*/
enc_tkt_reply.times.authtime = 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;
if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION)) {
altcprinc = s4u_x509_user->user_id.user;
} else if (isflagset(c_flags, KRB5_KDB_FLAG_CONSTRAINED_DELEGATION)) {
altcprinc = subject_tkt->client;
} else {
altcprinc = NULL;
}
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;
}
/*
* Convert server.key into a real key
* (it may be encrypted in the database)
*/
if ((errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL,
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
* try to lookup the client principal so plugins can add additional
* authorization information.
*
* Always validate authorization data for constrained delegation
* because we must validate the KDC signatures.
*/
if (!isflagset(c_flags, KRB5_KDB_FLAGS_S4U)) {
/* 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(client == NULL); /* should not have been set already */
errcode = krb5_db_get_principal(kdc_context, subject_tkt->client,
c_flags, &client);
}
}
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 = subject_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 "" */
/*
* 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 (krb5_realm_compare(kdc_context, header_ticket->server, tgs_server) ||
krb5_realm_compare(kdc_context, 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 = "VALIDATE_TRANSIT_TYPE";
errcode = KRB5KDC_ERR_TRTYPE_NOSUPP;
goto cleanup;
}
memset(&enc_tkt_reply.transited, 0, sizeof(enc_tkt_reply.transited));
enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
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_TO_TRANSITED_LIST";
goto cleanup;
}
newtransited = 1;
}
if (isflagset(c_flags, KRB5_KDB_FLAG_CROSS_REALM)) {
errcode = validate_transit_path(kdc_context, header_enc_tkt->client,
server, header_server);
if (errcode) {
status = "NON_TRANSITIVE";
goto cleanup;
}
}
if (!isflagset (request->kdc_options, KDC_OPT_DISABLE_TRANSITED_CHECK)) {
errcode = kdc_check_transited_list (kdc_active_realm,
&enc_tkt_reply.transited.tr_contents,
krb5_princ_realm (kdc_context, header_enc_tkt->client),
krb5_princ_realm (kdc_context, request->server));
if (errcode == 0) {
setflag (enc_tkt_reply.flags, TKT_FLG_TRANSIT_POLICY_CHECKED);
} else {
log_tgs_badtrans(kdc_context, cprinc, sprinc,
&enc_tkt_reply.transited.tr_contents, errcode);
}
} else
krb5_klog_syslog(LOG_INFO, _("not checking transit path"));
if (kdc_active_realm->realm_reject_bad_transit &&
!isflagset(enc_tkt_reply.flags, TKT_FLG_TRANSIT_POLICY_CHECKED)) {
errcode = KRB5KDC_ERR_POLICY;
status = "BAD_TRANSIT";
au_state->violation = LOCAL_POLICY;
goto cleanup;
}
errcode = handle_authdata(kdc_context, c_flags, client, server,
header_server, local_tgt,
subkey != NULL ? subkey :
header_ticket->enc_part2->session,
&encrypting_key, /* U2U or server key */
header_key,
pkt,
request,
s4u_x509_user ?
s4u_x509_user->user_id.user : NULL,
subject_tkt,
auth_indicators,
&enc_tkt_reply);
if (errcode) {
krb5_klog_syslog(LOG_INFO, _("TGS_REQ : handle_authdata (%d)"),
errcode);
status = "HANDLE_AUTHDATA";
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)) {
altcprinc = client2;
errcode = KRB5KDC_ERR_SERVER_NOMATCH;
status = "2ND_TKT_MISMATCH";
au_state->status = status;
kau_u2u(kdc_context, FALSE, au_state);
goto cleanup;
}
ticket_kvno = 0;
ticket_reply.enc_part.enctype = t2enc->session->enctype;
kau_u2u(kdc_context, TRUE, au_state);
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 = "ENCRYPT_TICKET";
goto cleanup;
}
ticket_reply.enc_part.kvno = ticket_kvno;
/* Start assembling the response */
au_state->stage = ENCR_REP;
reply.msg_type = KRB5_TGS_REP;
if (isflagset(c_flags, KRB5_KDB_FLAG_PROTOCOL_TRANSITION) &&
krb5int_find_pa_data(kdc_context, 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 = "MAKE_S4U2SELF_PADATA";
au_state->status = status;
}
kau_s4u2self(kdc_context, errcode ? FALSE : TRUE, au_state);
if (errcode)
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 */
reply_encpart.times = enc_tkt_reply.times;
nolrentry.lr_type = KRB5_LRQ_NONE;
nolrentry.value = 0;
nolrentry.magic = 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 = "MAKE_FAST_RESPONSE";
goto cleanup;
}
errcode =kdc_fast_handle_reply_key(state,
subkey?subkey:header_ticket->enc_part2->session, &reply_key);
if (errcode) {
status = "MAKE_FAST_REPLY_KEY";
goto cleanup;
}
errcode = return_enc_padata(kdc_context, pkt, request,
reply_key, server, &reply_encpart,
is_referral &&
isflagset(s_flags,
KRB5_KDB_FLAG_CANONICALIZE));
if (errcode) {
status = "KDC_RETURN_ENC_PADATA";
goto cleanup;
}
errcode = kau_make_tkt_id(kdc_context, &ticket_reply, &au_state->tkt_out_id);
if (errcode) {
status = "GENERATE_TICKET_ID";
goto cleanup;
}
if (kdc_fast_hide_client(state))
reply.client = (krb5_principal)krb5_anonymous_principal();
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);
au_state->status = status;
if (!errcode)
au_state->reply = &reply;
kau_tgs_req(kdc_context, errcode ? FALSE : TRUE, au_state);
kau_free_kdc_req(au_state);
log_tgs_req(kdc_context, from, request, &reply, cprinc,
sprinc, altcprinc, authtime,
c_flags, 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 > KRB_ERR_MAX)
errcode = KRB_ERR_GENERIC;
retval = prepare_error_tgs(state, request, header_ticket, errcode,
(server != NULL) ? server->princ : NULL,
response, status, e_data);
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);
krb5_db_free_principal(kdc_context, server);
krb5_db_free_principal(kdc_context, header_server);
krb5_db_free_principal(kdc_context, client);
krb5_db_free_principal(kdc_context, local_tgt_storage);
if (session_key.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &session_key);
if (newtransited)
free(enc_tkt_reply.transited.tr_contents.data);
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 (subkey != NULL)
krb5_free_keyblock(kdc_context, subkey);
if (header_key != NULL)
krb5_free_keyblock(kdc_context, header_key);
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);
if (enc_tkt_reply.authorization_data != NULL)
krb5_free_authdata(kdc_context, enc_tkt_reply.authorization_data);
krb5_free_pa_data(kdc_context, e_data);
k5_free_data_ptr_list(auth_indicators);
return retval;
}
static void
finish_process_as_req(struct as_req_state *state, krb5_error_code errcode)
{
krb5_key_data *server_key;
krb5_key_data *client_key;
krb5_keyblock *as_encrypting_key = NULL;
krb5_data *response = NULL;
const char *emsg = 0;
int did_log = 0;
register int i;
krb5_enctype useenctype;
loop_respond_fn oldrespond;
void *oldarg;
kdc_realm_t *kdc_active_realm = state->active_realm;
assert(state);
oldrespond = state->respond;
oldarg = state->arg;
if (errcode)
goto egress;
if ((errcode = validate_forwardable(state->request, *state->client,
*state->server, state->kdc_time,
&state->status))) {
errcode += ERROR_TABLE_BASE_krb5;
goto egress;
}
state->ticket_reply.enc_part2 = &state->enc_tkt_reply;
/*
* Find the server key
*/
if ((errcode = krb5_dbe_find_enctype(kdc_context, state->server,
-1, /* ignore keytype */
-1, /* Ignore salttype */
0, /* Get highest kvno */
&server_key))) {
state->status = "FINDING_SERVER_KEY";
goto egress;
}
/*
* Convert server->key into a real key
* (it may be encrypted in the database)
*
* server_keyblock is later used to generate auth data signatures
*/
if ((errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL,
server_key,
&state->server_keyblock,
NULL))) {
state->status = "DECRYPT_SERVER_KEY";
goto egress;
}
/*
* Find the appropriate client key. We search in the order specified
* by request keytype list.
*/
client_key = NULL;
useenctype = 0;
for (i = 0; i < state->request->nktypes; i++) {
useenctype = state->request->ktype[i];
if (!krb5_c_valid_enctype(useenctype))
continue;
if (!krb5_dbe_find_enctype(kdc_context, state->client,
useenctype, -1, 0, &client_key))
break;
}
if (!(client_key)) {
/* Cannot find an appropriate key */
state->status = "CANT_FIND_CLIENT_KEY";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
goto egress;
}
state->rock.client_key = client_key;
/* convert client.key_data into a real key */
if ((errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL,
client_key,
&state->client_keyblock,
NULL))) {
state->status = "DECRYPT_CLIENT_KEY";
goto egress;
}
state->client_keyblock.enctype = useenctype;
/* Start assembling the response */
state->reply.msg_type = KRB5_AS_REP;
state->reply.client = state->enc_tkt_reply.client; /* post canonization */
state->reply.ticket = &state->ticket_reply;
state->reply_encpart.session = &state->session_key;
if ((errcode = fetch_last_req_info(state->client,
&state->reply_encpart.last_req))) {
state->status = "FETCH_LAST_REQ";
goto egress;
}
state->reply_encpart.nonce = state->request->nonce;
state->reply_encpart.key_exp = get_key_exp(state->client);
state->reply_encpart.flags = state->enc_tkt_reply.flags;
state->reply_encpart.server = state->ticket_reply.server;
/* copy the time fields EXCEPT for authtime; it's location
* is used for ktime
*/
state->reply_encpart.times = state->enc_tkt_reply.times;
state->reply_encpart.times.authtime = state->authtime = state->kdc_time;
state->reply_encpart.caddrs = state->enc_tkt_reply.caddrs;
state->reply_encpart.enc_padata = NULL;
/* Fetch the padata info to be returned (do this before
* authdata to handle possible replacement of reply key
*/
errcode = return_padata(kdc_context, &state->rock, state->req_pkt,
state->request, &state->reply,
&state->client_keyblock, &state->pa_context);
if (errcode) {
state->status = "KDC_RETURN_PADATA";
goto egress;
}
errcode = handle_authdata(kdc_context,
state->c_flags,
state->client,
state->server,
state->server,
&state->client_keyblock,
&state->server_keyblock,
&state->server_keyblock,
state->req_pkt,
state->request,
NULL, /* for_user_princ */
NULL, /* enc_tkt_request */
&state->enc_tkt_reply);
if (errcode) {
krb5_klog_syslog(LOG_INFO, _("AS_REQ : handle_authdata (%d)"),
errcode);
state->status = "HANDLE_AUTHDATA";
goto egress;
}
errcode = krb5_encrypt_tkt_part(kdc_context, &state->server_keyblock,
&state->ticket_reply);
if (errcode) {
state->status = "ENCRYPTING_TICKET";
goto egress;
}
state->ticket_reply.enc_part.kvno = server_key->key_data_kvno;
errcode = kdc_fast_response_handle_padata(state->rstate,
state->request,
&state->reply,
state->client_keyblock.enctype);
if (errcode) {
state->status = "fast response handling";
goto egress;
}
/* now encode/encrypt the response */
state->reply.enc_part.enctype = state->client_keyblock.enctype;
errcode = kdc_fast_handle_reply_key(state->rstate, &state->client_keyblock,
&as_encrypting_key);
if (errcode) {
state->status = "generating reply key";
goto egress;
}
errcode = return_enc_padata(kdc_context, state->req_pkt, state->request,
as_encrypting_key, state->server,
&state->reply_encpart, FALSE);
if (errcode) {
state->status = "KDC_RETURN_ENC_PADATA";
goto egress;
}
errcode = krb5_encode_kdc_rep(kdc_context, KRB5_AS_REP,
&state->reply_encpart, 0,
as_encrypting_key,
&state->reply, &response);
state->reply.enc_part.kvno = client_key->key_data_kvno;
if (errcode) {
state->status = "ENCODE_KDC_REP";
goto egress;
}
/* 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(state->reply.enc_part.ciphertext.data, 0,
state->reply.enc_part.ciphertext.length);
free(state->reply.enc_part.ciphertext.data);
log_as_req(kdc_context, state->from, state->request, &state->reply,
state->client, state->cname, state->server,
state->sname, state->authtime, 0, 0, 0);
did_log = 1;
egress:
if (errcode != 0)
assert (state->status != 0);
free_padata_context(kdc_context, state->pa_context);
if (as_encrypting_key)
krb5_free_keyblock(kdc_context, as_encrypting_key);
if (errcode)
emsg = krb5_get_error_message(kdc_context, errcode);
if (state->status) {
log_as_req(kdc_context,
state->from, state->request, &state->reply, state->client,
state->cname, state->server, state->sname, state->authtime,
state->status, errcode, emsg);
did_log = 1;
}
if (errcode) {
if (state->status == 0) {
state->status = emsg;
}
if (errcode != KRB5KDC_ERR_DISCARD) {
errcode -= ERROR_TABLE_BASE_krb5;
if (errcode < 0 || errcode > 128)
errcode = KRB_ERR_GENERIC;
errcode = prepare_error_as(state->rstate, state->request,
errcode, state->e_data,
state->typed_e_data,
((state->client != NULL) ?
state->client->princ : NULL),
&response, state->status);
state->status = 0;
}
}
if (emsg)
krb5_free_error_message(kdc_context, emsg);
if (state->enc_tkt_reply.authorization_data != NULL)
krb5_free_authdata(kdc_context,
state->enc_tkt_reply.authorization_data);
if (state->server_keyblock.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->server_keyblock);
if (state->client_keyblock.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->client_keyblock);
if (state->reply.padata != NULL)
krb5_free_pa_data(kdc_context, state->reply.padata);
if (state->reply_encpart.enc_padata)
krb5_free_pa_data(kdc_context, state->reply_encpart.enc_padata);
if (state->cname != NULL)
free(state->cname);
if (state->sname != NULL)
free(state->sname);
krb5_db_free_principal(kdc_context, state->client);
krb5_db_free_principal(kdc_context, state->server);
if (state->session_key.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->session_key);
if (state->ticket_reply.enc_part.ciphertext.data != NULL) {
memset(state->ticket_reply.enc_part.ciphertext.data , 0,
state->ticket_reply.enc_part.ciphertext.length);
free(state->ticket_reply.enc_part.ciphertext.data);
}
krb5_free_pa_data(kdc_context, state->e_data);
krb5_free_data(kdc_context, state->inner_body);
kdc_free_rstate(state->rstate);
krb5_free_kdc_req(kdc_context, state->request);
assert(did_log != 0);
free(state);
(*oldrespond)(oldarg, errcode, response);
}
/* Advance the referral request loop. */
static krb5_error_code
step_referrals(krb5_context context, krb5_tkt_creds_context ctx)
{
krb5_error_code code;
const krb5_data *referral_realm;
/* Possibly retry with the fallback realm on error. */
if (ctx->reply_code != 0)
return try_fallback_realm(context, ctx);
if (krb5_principal_compare(context, ctx->reply_creds->server,
ctx->server)) {
/* We got the ticket we asked for... but we didn't necessarily ask for
* it with the right enctypes. Try a non-referral request if so. */
if (wrong_enctype(context, ctx->reply_creds->keyblock.enctype)) {
TRACE_TKT_CREDS_WRONG_ENCTYPE(context);
return begin_non_referral(context, ctx);
}
return complete(context, ctx);
}
/* Old versions of Active Directory can rewrite the server name instead of
* returning a referral. Try a non-referral query if we see this. */
if (!IS_TGS_PRINC(context, ctx->reply_creds->server)) {
TRACE_TKT_CREDS_NON_TGT(context, ctx->reply_creds->server);
return begin_non_referral(context, ctx);
}
if (ctx->referral_count == 1) {
/* Cache the referral TGT only if it's from the local realm.
* Make sure to note the associated authdata, if any. */
code = krb5_copy_authdata(context, ctx->authdata,
&ctx->reply_creds->authdata);
if (code != 0)
return code;
(void) krb5_cc_store_cred(context, ctx->ccache, ctx->reply_creds);
/* The authdata in this TGT will be copied into subsequent TGTs or the
* final credentials, so we don't need to request it again. */
krb5_free_authdata(context, ctx->in_creds->authdata);
ctx->in_creds->authdata = NULL;
}
/* Give up if we've gotten too many referral TGTs. */
if (ctx->referral_count++ >= KRB5_REFERRAL_MAXHOPS)
return KRB5_KDC_UNREACH;
/* Check for referral loops. */
referral_realm = &ctx->reply_creds->server->data[1];
if (seen_realm_before(context, ctx, referral_realm))
return KRB5_KDC_UNREACH;
code = remember_realm(context, ctx, referral_realm);
if (code != 0)
return code;
/* Use the referral TGT for the next request. */
krb5_free_creds(context, ctx->cur_tgt);
ctx->cur_tgt = ctx->reply_creds;
ctx->reply_creds = NULL;
TRACE_TKT_CREDS_REFERRAL(context, ctx->cur_tgt->server);
/* Rewrite the server realm to be the referral realm. */
krb5_free_data_contents(context, &ctx->server->realm);
code = krb5int_copy_data_contents(context, referral_realm,
&ctx->server->realm);
if (code != 0)
return code;
/* Generate the next referral request. */
return make_request_for_service(context, ctx, TRUE);
}
