static krb5_error_code
encrypt_v4_ticket(krb5_context context,
krb5_kdc_configuration *config,
void *buf,
size_t len,
krb5_keyblock *skey,
EncryptedData *reply)
{
krb5_crypto crypto;
krb5_error_code ret;
ret = krb5_crypto_init(context, skey, ETYPE_DES_PCBC_NONE, &crypto);
if (ret) {
free(buf);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
krb5_get_err_text(context, ret));
return ret;
}
ret = krb5_encrypt_EncryptedData(context,
crypto,
KRB5_KU_TICKET,
buf,
len,
0,
reply);
krb5_crypto_destroy(context, crypto);
if(ret) {
kdc_log(context, config, 0, "Failed to encrypt data: %s",
krb5_get_err_text(context, ret));
return ret;
}
return 0;
}
static int
match_rfc_san(krb5_context context,
krb5_kdc_configuration *config,
hx509_context hx509ctx,
hx509_cert client_cert,
krb5_const_principal match)
{
hx509_octet_string_list list;
int ret, found = 0;
size_t i;
memset(&list, 0 , sizeof(list));
ret = hx509_cert_find_subjectAltName_otherName(hx509ctx,
client_cert,
&asn1_oid_id_pkinit_san,
&list);
if (ret)
goto out;
for (i = 0; !found && i < list.len; i++) {
krb5_principal_data principal;
KRB5PrincipalName kn;
size_t size;
ret = decode_KRB5PrincipalName(list.val[i].data,
list.val[i].length,
&kn, &size);
if (ret) {
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0,
"Decoding kerberos name in certificate failed: %s", msg);
krb5_free_error_message(context, msg);
break;
}
if (size != list.val[i].length) {
kdc_log(context, config, 0,
"Decoding kerberos name have extra bits on the end");
return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
}
memset(&principal, 0, sizeof (principal));
principal.name = kn.principalName;
principal.realm = kn.realm;
if (krb5_principal_compare(context, &principal, match) == TRUE)
found = 1;
free_KRB5PrincipalName(&kn);
}
out:
hx509_free_octet_string_list(&list);
if (ret)
return ret;
if (!found)
return KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
return 0;
}
static krb5_error_code
log_524 (krb5_context context,
krb5_kdc_configuration *config,
const EncTicketPart *et,
const char *from,
const char *spn)
{
krb5_principal client;
char *cpn;
krb5_error_code ret;
ret = _krb5_principalname2krb5_principal(context, &client,
et->cname, et->crealm);
if (ret) {
kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
krb5_get_err_text (context, ret));
return ret;
}
ret = krb5_unparse_name(context, client, &cpn);
if (ret) {
krb5_free_principal(context, client);
kdc_log(context, config, 0, "krb5_unparse_name: %s",
krb5_get_err_text (context, ret));
return ret;
}
kdc_log(context, config, 1, "524-REQ %s from %s for %s", cpn, from, spn);
free(cpn);
krb5_free_principal(context, client);
return 0;
}
static krb5_error_code
fetch_server (const Ticket *t,
char **spn,
hdb_entry **server,
const char *from)
{
krb5_error_code ret;
krb5_principal sprinc;
ret = _krb5_principalname2krb5_principal(&sprinc, t->sname, t->realm);
if (ret) {
kdc_log(0, "_krb5_principalname2krb5_principal: %s",
krb5_get_err_text(context, ret));
return ret;
}
ret = krb5_unparse_name(context, sprinc, spn);
if (ret) {
krb5_free_principal(context, sprinc);
kdc_log(0, "krb5_unparse_name: %s", krb5_get_err_text(context, ret));
return ret;
}
ret = db_fetch(sprinc, server);
krb5_free_principal(context, sprinc);
if (ret) {
kdc_log(0,
"Request to convert ticket from %s for unknown principal %s: %s",
from, *spn, krb5_get_err_text(context, ret));
if (ret == HDB_ERR_NOENTRY)
ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
return ret;
}
return 0;
}
static void
log_as_req(krb5_context context,
krb5_kdc_configuration *config,
krb5_enctype cetype,
krb5_enctype setype,
const KDC_REQ_BODY *b)
{
krb5_error_code ret;
struct rk_strpool *p = NULL;
char *str;
int i;
for (i = 0; i < b->etype.len; i++) {
ret = krb5_enctype_to_string(context, b->etype.val[i], &str);
if (ret == 0) {
p = rk_strpoolprintf(p, "%s", str);
free(str);
} else
p = rk_strpoolprintf(p, "%d", b->etype.val[i]);
if (p && i + 1 < b->etype.len)
p = rk_strpoolprintf(p, ", ");
if (p == NULL) {
kdc_log(context, config, 0, "out of memory");
return;
}
}
if (p == NULL)
p = rk_strpoolprintf(p, "no encryption types");
str = rk_strpoolcollect(p);
kdc_log(context, config, 0, "Client supported enctypes: %s", str);
free(str);
{
char *cet;
char *set;
ret = krb5_enctype_to_string(context, cetype, &cet);
if(ret == 0) {
ret = krb5_enctype_to_string(context, setype, &set);
if (ret == 0) {
kdc_log(context, config, 5, "Using %s/%s", cet, set);
free(set);
}
free(cet);
}
if (ret != 0)
kdc_log(context, config, 5, "Using e-types %d/%d", cetype, setype);
}
{
char fixedstr[128];
unparse_flags(KDCOptions2int(b->kdc_options), asn1_KDCOptions_units(),
fixedstr, sizeof(fixedstr));
if(*fixedstr)
kdc_log(context, config, 2, "Requested flags: %s", fixedstr);
}
}
static krb5_error_code
encode_524_response(const char *spn, const EncTicketPart et, const Ticket *t,
hdb_entry *server, EncryptedData *ticket, int *kvno)
{
krb5_error_code ret;
int use_2b;
size_t len;
use_2b = krb5_config_get_bool(context, NULL, "kdc", "use_2b", spn, NULL);
if(use_2b) {
ASN1_MALLOC_ENCODE(EncryptedData,
ticket->cipher.data, ticket->cipher.length,
&t->enc_part, &len, ret);
if (ret) {
kdc_log(0, "Failed to encode v4 (2b) ticket (%s)", spn);
return ret;
}
ticket->etype = 0;
ticket->kvno = NULL;
*kvno = 213; /* 2b's use this magic kvno */
} else {
unsigned char buf[MAX_KTXT_LEN + 4 * 4];
Key *skey;
if (!enable_v4_cross_realm && strcmp (et.crealm, t->realm) != 0) {
kdc_log(0, "524 cross-realm %s -> %s disabled", et.crealm,
t->realm);
return KRB5KDC_ERR_POLICY;
}
ret = encode_v4_ticket(buf + sizeof(buf) - 1, sizeof(buf),
&et, &t->sname, &len);
if(ret){
kdc_log(0, "Failed to encode v4 ticket (%s)", spn);
return ret;
}
ret = get_des_key(server, TRUE, FALSE, &skey);
if(ret){
kdc_log(0, "no suitable DES key for server (%s)", spn);
return ret;
}
ret = encrypt_v4_ticket(buf + sizeof(buf) - len, len,
&skey->key, ticket);
if(ret){
kdc_log(0, "Failed to encrypt v4 ticket (%s)", spn);
return ret;
}
*kvno = server->kvno;
}
return 0;
}
static krb5_error_code
set_address (krb5_context context,
krb5_kdc_configuration *config,
EncTicketPart *et,
struct sockaddr *addr,
const char *from)
{
krb5_error_code ret;
krb5_address *v4_addr;
v4_addr = malloc (sizeof(*v4_addr));
if (v4_addr == NULL)
return ENOMEM;
ret = krb5_sockaddr2address(context, addr, v4_addr);
if(ret) {
free (v4_addr);
kdc_log(context, config, 0, "Failed to convert address (%s)", from);
return ret;
}
if (et->caddr && !krb5_address_search (context, v4_addr, et->caddr)) {
kdc_log(context, config, 0, "Incorrect network address (%s)", from);
krb5_free_address(context, v4_addr);
free (v4_addr);
return KRB5KRB_AP_ERR_BADADDR;
}
if(v4_addr->addr_type == KRB5_ADDRESS_INET) {
/* we need to collapse the addresses in the ticket to a
single address; best guess is to use the address the
connection came from */
if (et->caddr != NULL) {
free_HostAddresses(et->caddr);
} else {
et->caddr = malloc (sizeof (*et->caddr));
if (et->caddr == NULL) {
krb5_free_address(context, v4_addr);
free(v4_addr);
return ENOMEM;
}
}
et->caddr->val = v4_addr;
et->caddr->len = 1;
} else {
krb5_free_address(context, v4_addr);
free(v4_addr);
}
return 0;
}
static krb5_error_code
verify_flags (const EncTicketPart *et,
const char *spn)
{
if(et->endtime < kdc_time){
kdc_log(0, "Ticket expired (%s)", spn);
return KRB5KRB_AP_ERR_TKT_EXPIRED;
}
if(et->flags.invalid){
kdc_log(0, "Ticket not valid (%s)", spn);
return KRB5KRB_AP_ERR_TKT_NYV;
}
return 0;
}
static krb5_error_code
check_constrained_delegation(krb5_context context,
krb5_kdc_configuration *config,
hdb_entry_ex *client,
krb5_const_principal server)
{
const HDB_Ext_Constrained_delegation_acl *acl;
krb5_error_code ret;
int i;
ret = hdb_entry_get_ConstrainedDelegACL(&client->entry, &acl);
if (ret) {
krb5_clear_error_string(context);
return ret;
}
if (acl) {
for (i = 0; i < acl->len; i++) {
if (krb5_principal_compare(context, server, &acl->val[i]) == TRUE)
return 0;
}
}
kdc_log(context, config, 0,
"Bad request for constrained delegation");
return KRB5KDC_ERR_BADOPTION;
}
static krb5_error_code
verify_flags (krb5_context context,
krb5_kdc_configuration *config,
const EncTicketPart *et,
const char *pstr)
{
if(et->endtime < kdc_time){
kdc_log(context, config, 0, "Ticket expired (%s)", pstr);
return KRB5KRB_AP_ERR_TKT_EXPIRED;
}
if(et->flags.invalid){
kdc_log(context, config, 0, "Ticket not valid (%s)", pstr);
return KRB5KRB_AP_ERR_TKT_NYV;
}
return 0;
}
void
_kdc_log_timestamp(krb5_context context,
krb5_kdc_configuration *config,
const char *type,
KerberosTime authtime, KerberosTime *starttime,
KerberosTime endtime, KerberosTime *renew_till)
{
char authtime_str[100], starttime_str[100],
endtime_str[100], renewtime_str[100];
krb5_format_time(context, authtime,
authtime_str, sizeof(authtime_str), TRUE);
if (starttime)
krb5_format_time(context, *starttime,
starttime_str, sizeof(starttime_str), TRUE);
else
strlcpy(starttime_str, "unset", sizeof(starttime_str));
krb5_format_time(context, endtime,
endtime_str, sizeof(endtime_str), TRUE);
if (renew_till)
krb5_format_time(context, *renew_till,
renewtime_str, sizeof(renewtime_str), TRUE);
else
strlcpy(renewtime_str, "unset", sizeof(renewtime_str));
kdc_log(context, config, 5,
"%s authtime: %s starttime: %s endtime: %s renew till: %s",
type, authtime_str, starttime_str, endtime_str, renewtime_str);
}
krb5_error_code
krb5_kdc_set_dbinfo(krb5_context context, struct krb5_kdc_configuration *c)
{
struct hdb_dbinfo *info, *d;
krb5_error_code ret;
int i;
/* fetch the databases */
ret = hdb_get_dbinfo(context, &info);
if (ret)
return ret;
d = NULL;
while ((d = hdb_dbinfo_get_next(info, d)) != NULL) {
ret = add_db(context, c,
hdb_dbinfo_get_dbname(context, d),
hdb_dbinfo_get_mkey_file(context, d));
if (ret)
goto out;
kdc_log(context, c, 0, "label: %s",
hdb_dbinfo_get_label(context, d));
kdc_log(context, c, 0, "\tdbname: %s",
hdb_dbinfo_get_dbname(context, d));
kdc_log(context, c, 0, "\tmkey_file: %s",
hdb_dbinfo_get_mkey_file(context, d));
kdc_log(context, c, 0, "\tacl_file: %s",
hdb_dbinfo_get_acl_file(context, d));
}
hdb_free_dbinfo(context, &info);
return 0;
out:
for (i = 0; i < c->num_db; i++)
if (c->db[i] && c->db[i]->hdb_destroy)
(*c->db[i]->hdb_destroy)(context, c->db[i]);
c->num_db = 0;
free(c->db);
c->db = NULL;
hdb_free_dbinfo(context, &info);
return ret;
}
static void
log_patypes(krb5_context context,
krb5_kdc_configuration *config,
METHOD_DATA *padata)
{
struct rk_strpool *p = NULL;
char *str;
size_t i;
for (i = 0; i < padata->len; i++) {
switch(padata->val[i].padata_type) {
case KRB5_PADATA_PK_AS_REQ:
p = rk_strpoolprintf(p, "PK-INIT(ietf)");
break;
case KRB5_PADATA_PK_AS_REQ_WIN:
p = rk_strpoolprintf(p, "PK-INIT(win2k)");
break;
case KRB5_PADATA_PA_PK_OCSP_RESPONSE:
p = rk_strpoolprintf(p, "OCSP");
break;
case KRB5_PADATA_ENC_TIMESTAMP:
p = rk_strpoolprintf(p, "encrypted-timestamp");
break;
default:
p = rk_strpoolprintf(p, "%d", padata->val[i].padata_type);
break;
}
if (p && i + 1 < padata->len)
p = rk_strpoolprintf(p, ", ");
if (p == NULL) {
kdc_log(context, config, 0, "out of memory");
return;
}
}
if (p == NULL)
p = rk_strpoolprintf(p, "none");
str = rk_strpoolcollect(p);
kdc_log(context, config, 0, "Client sent patypes: %s", str);
free(str);
}
static krb5_error_code
fast_parse_cookie(kdc_request_t r, const PA_DATA *pa)
{
krb5_crypto crypto = NULL;
krb5_error_code ret;
KDCFastCookie data;
krb5_data d1;
size_t len;
ret = decode_KDCFastCookie(pa->padata_value.data,
pa->padata_value.length,
&data, &len);
if (ret)
return ret;
if (len != pa->padata_value.length || strcmp("H5L1", data.version) != 0) {
free_KDCFastCookie(&data);
return KRB5KDC_ERR_POLICY;
}
ret = get_fastuser_crypto(r, data.cookie.etype, &crypto);
if (ret)
goto out;
ret = krb5_decrypt_EncryptedData(r->context, crypto,
KRB5_KU_H5L_COOKIE,
&data.cookie, &d1);
krb5_crypto_destroy(r->context, crypto);
if (ret)
goto out;
ret = decode_KDCFastState(d1.data, d1.length, &r->fast, &len);
krb5_data_free(&d1);
if (ret)
goto out;
if (r->fast.expiration < kdc_time) {
kdc_log(r->context, r->config, 0, "fast cookie expired");
ret = KRB5KDC_ERR_POLICY;
goto out;
}
out:
free_KDCFastCookie(&data);
return ret;
}
static krb5_error_code
make_etype_info_entry(krb5_context context, ETYPE_INFO_ENTRY *ent, Key *key)
{
ent->etype = key->key.keytype;
if(key->salt){
#if 0
ALLOC(ent->salttype);
if(key->salt->type == hdb_pw_salt)
*ent->salttype = 0; /* or 1? or NULL? */
else if(key->salt->type == hdb_afs3_salt)
*ent->salttype = 2;
else {
kdc_log(context, config, 0, "unknown salt-type: %d",
key->salt->type);
return KRB5KRB_ERR_GENERIC;
}
/* according to `the specs', we can't send a salt if
we have AFS3 salted key, but that requires that you
*know* what cell you are using (e.g by assuming
that the cell is the same as the realm in lower
case) */
#elif 0
ALLOC(ent->salttype);
*ent->salttype = key->salt->type;
#else
/*
* We shouldn't sent salttype since it is incompatible with the
* specification and it breaks windows clients. The afs
* salting problem is solved by using KRB5-PADATA-AFS3-SALT
* implemented in Heimdal 0.7 and later.
*/
ent->salttype = NULL;
#endif
krb5_copy_data(context, &key->salt->salt,
&ent->salt);
} else {
/* we return no salt type at all, as that should indicate
* the default salt type and make everybody happy. some
* systems (like w2k) dislike being told the salt type
* here. */
ent->salttype = NULL;
ent->salt = NULL;
}
return 0;
}
krb5_error_code
_kdc_encode_reply(krb5_context context,
krb5_kdc_configuration *config,
KDC_REP *rep, const EncTicketPart *et, EncKDCRepPart *ek,
krb5_enctype etype,
int skvno, const EncryptionKey *skey,
int ckvno, const EncryptionKey *reply_key,
int rk_is_subkey,
const char **e_text,
krb5_data *reply)
{
unsigned char *buf;
size_t buf_size;
size_t len = 0;
krb5_error_code ret;
krb5_crypto crypto;
ASN1_MALLOC_ENCODE(EncTicketPart, buf, buf_size, et, &len, ret);
if(ret) {
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "Failed to encode ticket: %s", msg);
krb5_free_error_message(context, msg);
return ret;
}
if(buf_size != len) {
free(buf);
kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
*e_text = "KDC internal error";
return KRB5KRB_ERR_GENERIC;
}
ret = krb5_crypto_init(context, skey, etype, &crypto);
if (ret) {
const char *msg;
free(buf);
msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
krb5_free_error_message(context, msg);
return ret;
}
ret = krb5_encrypt_EncryptedData(context,
crypto,
KRB5_KU_TICKET,
buf,
len,
skvno,
&rep->ticket.enc_part);
free(buf);
krb5_crypto_destroy(context, crypto);
if(ret) {
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "Failed to encrypt data: %s", msg);
krb5_free_error_message(context, msg);
return ret;
}
if(rep->msg_type == krb_as_rep && !config->encode_as_rep_as_tgs_rep)
ASN1_MALLOC_ENCODE(EncASRepPart, buf, buf_size, ek, &len, ret);
else
ASN1_MALLOC_ENCODE(EncTGSRepPart, buf, buf_size, ek, &len, ret);
if(ret) {
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "Failed to encode KDC-REP: %s", msg);
krb5_free_error_message(context, msg);
return ret;
}
if(buf_size != len) {
free(buf);
kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
*e_text = "KDC internal error";
return KRB5KRB_ERR_GENERIC;
}
ret = krb5_crypto_init(context, reply_key, 0, &crypto);
if (ret) {
const char *msg = krb5_get_error_message(context, ret);
free(buf);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
krb5_free_error_message(context, msg);
return ret;
}
if(rep->msg_type == krb_as_rep) {
krb5_encrypt_EncryptedData(context,
crypto,
KRB5_KU_AS_REP_ENC_PART,
buf,
len,
ckvno,
&rep->enc_part);
free(buf);
ASN1_MALLOC_ENCODE(AS_REP, buf, buf_size, rep, &len, ret);
} else {
krb5_encrypt_EncryptedData(context,
crypto,
rk_is_subkey ? KRB5_KU_TGS_REP_ENC_PART_SUB_KEY : KRB5_KU_TGS_REP_ENC_PART_SESSION,
buf,
len,
ckvno,
&rep->enc_part);
free(buf);
ASN1_MALLOC_ENCODE(TGS_REP, buf, buf_size, rep, &len, ret);
}
krb5_crypto_destroy(context, crypto);
if(ret) {
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "Failed to encode KDC-REP: %s", msg);
krb5_free_error_message(context, msg);
return ret;
}
if(buf_size != len) {
free(buf);
kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
*e_text = "KDC internal error";
return KRB5KRB_ERR_GENERIC;
}
reply->data = buf;
reply->length = buf_size;
return 0;
}
static krb5_error_code
pk_mk_pa_reply_dh(krb5_context context,
krb5_kdc_configuration *config,
pk_client_params *cp,
ContentInfo *content_info,
hx509_cert *kdc_cert)
{
KDCDHKeyInfo dh_info;
krb5_data signed_data, buf;
ContentInfo contentinfo;
krb5_error_code ret;
hx509_cert cert;
hx509_query *q;
size_t size = 0;
memset(&contentinfo, 0, sizeof(contentinfo));
memset(&dh_info, 0, sizeof(dh_info));
krb5_data_zero(&signed_data);
krb5_data_zero(&buf);
*kdc_cert = NULL;
if (cp->keyex == USE_DH) {
DH *kdc_dh = cp->u.dh.key;
heim_integer i;
ret = BN_to_integer(context, kdc_dh->pub_key, &i);
if (ret)
return ret;
ASN1_MALLOC_ENCODE(DHPublicKey, buf.data, buf.length, &i, &size, ret);
der_free_heim_integer(&i);
if (ret) {
krb5_set_error_message(context, ret, "ASN.1 encoding of "
"DHPublicKey failed (%d)", ret);
return ret;
}
if (buf.length != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
dh_info.subjectPublicKey.length = buf.length * 8;
dh_info.subjectPublicKey.data = buf.data;
krb5_data_zero(&buf);
} else if (cp->keyex == USE_ECDH) {
unsigned char *p;
ret = _kdc_serialize_ecdh_key(context, cp->u.ecdh.key, &p,
&dh_info.subjectPublicKey.length);
dh_info.subjectPublicKey.data = p;
if (ret)
goto out;
} else
krb5_abortx(context, "no keyex selected ?");
dh_info.nonce = cp->nonce;
ASN1_MALLOC_ENCODE(KDCDHKeyInfo, buf.data, buf.length, &dh_info, &size,
ret);
if (ret) {
krb5_set_error_message(context, ret, "ASN.1 encoding of "
"KdcDHKeyInfo failed (%d)", ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
/*
* Create the SignedData structure and sign the KdcDHKeyInfo
* filled in above
*/
ret = hx509_query_alloc(context->hx509ctx, &q);
if (ret)
goto out;
hx509_query_match_option(q, HX509_QUERY_OPTION_PRIVATE_KEY);
if (config->pkinit_kdc_friendly_name)
hx509_query_match_friendly_name(q, config->pkinit_kdc_friendly_name);
ret = hx509_certs_find(context->hx509ctx,
kdc_identity->certs,
q,
&cert);
hx509_query_free(context->hx509ctx, q);
if (ret)
goto out;
ret = hx509_cms_create_signed_1(context->hx509ctx,
0,
&asn1_oid_id_pkdhkeydata,
buf.data,
buf.length,
NULL,
cert,
cp->peer,
cp->client_anchors,
kdc_identity->certpool,
&signed_data);
if (ret) {
kdc_log(context, config, 0, "Failed signing the DH* reply: %d", ret);
goto out;
}
*kdc_cert = cert;
ret = _krb5_pk_mk_ContentInfo(context,
&signed_data,
&asn1_oid_id_pkcs7_signedData,
content_info);
if (ret)
goto out;
out:
if (ret && *kdc_cert) {
hx509_cert_free(*kdc_cert);
*kdc_cert = NULL;
}
krb5_data_free(&buf);
krb5_data_free(&signed_data);
free_KDCDHKeyInfo(&dh_info);
return ret;
}
static int
match_ms_upn_san(krb5_context context,
krb5_kdc_configuration *config,
hx509_context hx509ctx,
hx509_cert client_cert,
HDB *clientdb,
hdb_entry_ex *client)
{
hx509_octet_string_list list;
krb5_principal principal = NULL;
int ret;
MS_UPN_SAN upn;
size_t size;
memset(&list, 0 , sizeof(list));
ret = hx509_cert_find_subjectAltName_otherName(hx509ctx,
client_cert,
&asn1_oid_id_pkinit_ms_san,
&list);
if (ret)
goto out;
if (list.len != 1) {
kdc_log(context, config, 0,
"More then one PK-INIT MS UPN SAN");
ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
goto out;
}
ret = decode_MS_UPN_SAN(list.val[0].data, list.val[0].length, &upn, &size);
if (ret) {
kdc_log(context, config, 0, "Decode of MS-UPN-SAN failed");
goto out;
}
if (size != list.val[0].length) {
free_MS_UPN_SAN(&upn);
kdc_log(context, config, 0, "Trailing data in ");
ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
goto out;
}
kdc_log(context, config, 0, "found MS UPN SAN: %s", upn);
ret = krb5_parse_name(context, upn, &principal);
free_MS_UPN_SAN(&upn);
if (ret) {
kdc_log(context, config, 0, "Failed to parse principal in MS UPN SAN");
goto out;
}
if (clientdb->hdb_check_pkinit_ms_upn_match) {
ret = clientdb->hdb_check_pkinit_ms_upn_match(context, clientdb, client, principal);
} else {
/*
* This is very wrong, but will do for a fallback
*/
strupr(principal->realm);
if (krb5_principal_compare(context, principal, client->entry.principal) == FALSE)
ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
}
out:
if (principal)
krb5_free_principal(context, principal);
hx509_free_octet_string_list(&list);
return ret;
}
krb5_error_code
_kdc_pk_mk_pa_reply(krb5_context context,
krb5_kdc_configuration *config,
pk_client_params *cp,
const hdb_entry_ex *client,
krb5_enctype sessionetype,
const KDC_REQ *req,
const krb5_data *req_buffer,
krb5_keyblock *reply_key,
krb5_keyblock *sessionkey,
METHOD_DATA *md)
{
krb5_error_code ret;
void *buf = NULL;
size_t len = 0, size = 0;
krb5_enctype enctype;
int pa_type;
hx509_cert kdc_cert = NULL;
size_t i;
if (!config->enable_pkinit) {
krb5_clear_error_message(context);
return 0;
}
if (req->req_body.etype.len > 0) {
for (i = 0; i < req->req_body.etype.len; i++)
if (krb5_enctype_valid(context, req->req_body.etype.val[i]) == 0)
break;
if (req->req_body.etype.len <= i) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"No valid enctype available from client");
goto out;
}
enctype = req->req_body.etype.val[i];
} else
enctype = ETYPE_DES3_CBC_SHA1;
if (cp->type == PKINIT_27) {
PA_PK_AS_REP rep;
const char *type, *other = "";
memset(&rep, 0, sizeof(rep));
pa_type = KRB5_PADATA_PK_AS_REP;
if (cp->keyex == USE_RSA) {
ContentInfo info;
type = "enckey";
rep.element = choice_PA_PK_AS_REP_encKeyPack;
ret = krb5_generate_random_keyblock(context, enctype,
&cp->reply_key);
if (ret) {
free_PA_PK_AS_REP(&rep);
goto out;
}
ret = pk_mk_pa_reply_enckey(context,
config,
cp,
req,
req_buffer,
&cp->reply_key,
&info,
&kdc_cert);
if (ret) {
free_PA_PK_AS_REP(&rep);
goto out;
}
ASN1_MALLOC_ENCODE(ContentInfo, rep.u.encKeyPack.data,
rep.u.encKeyPack.length, &info, &size,
ret);
free_ContentInfo(&info);
if (ret) {
krb5_set_error_message(context, ret, "encoding of Key ContentInfo "
"failed %d", ret);
free_PA_PK_AS_REP(&rep);
goto out;
}
if (rep.u.encKeyPack.length != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
ret = krb5_generate_random_keyblock(context, sessionetype,
sessionkey);
if (ret) {
free_PA_PK_AS_REP(&rep);
goto out;
}
} else {
ContentInfo info;
switch (cp->keyex) {
case USE_DH: type = "dh"; break;
case USE_ECDH: type = "ecdh"; break;
default: krb5_abortx(context, "unknown keyex"); break;
}
if (cp->dh_group_name)
other = cp->dh_group_name;
rep.element = choice_PA_PK_AS_REP_dhInfo;
ret = generate_dh_keyblock(context, cp, enctype);
if (ret)
return ret;
ret = pk_mk_pa_reply_dh(context, config,
cp,
&info,
&kdc_cert);
if (ret) {
free_PA_PK_AS_REP(&rep);
krb5_set_error_message(context, ret,
"create pa-reply-dh "
"failed %d", ret);
goto out;
}
ASN1_MALLOC_ENCODE(ContentInfo, rep.u.dhInfo.dhSignedData.data,
rep.u.dhInfo.dhSignedData.length, &info, &size,
ret);
free_ContentInfo(&info);
if (ret) {
krb5_set_error_message(context, ret,
"encoding of Key ContentInfo "
"failed %d", ret);
free_PA_PK_AS_REP(&rep);
goto out;
}
if (rep.u.encKeyPack.length != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
/* generate the session key using the method from RFC6112 */
{
krb5_keyblock kdc_contribution_key;
krb5_crypto reply_crypto;
krb5_crypto kdccont_crypto;
krb5_data p1 = { strlen("PKINIT"), "PKINIT"};
krb5_data p2 = { strlen("KEYEXCHANGE"), "KEYEXCHANGE"};
void *kckdata;
size_t kcklen;
EncryptedData kx;
void *kxdata;
size_t kxlen;
ret = krb5_generate_random_keyblock(context, sessionetype,
&kdc_contribution_key);
if (ret) {
free_PA_PK_AS_REP(&rep);
goto out;
}
ret = krb5_crypto_init(context, &cp->reply_key, enctype, &reply_crypto);
if (ret) {
krb5_free_keyblock_contents(context, &kdc_contribution_key);
free_PA_PK_AS_REP(&rep);
goto out;
}
ret = krb5_crypto_init(context, &kdc_contribution_key, sessionetype, &kdccont_crypto);
if (ret) {
krb5_crypto_destroy(context, reply_crypto);
krb5_free_keyblock_contents(context, &kdc_contribution_key);
free_PA_PK_AS_REP(&rep);
goto out;
}
/* KRB-FX-CF2 */
ret = krb5_crypto_fx_cf2(context, kdccont_crypto, reply_crypto,
&p1, &p2, sessionetype, sessionkey);
krb5_crypto_destroy(context, kdccont_crypto);
if (ret) {
krb5_crypto_destroy(context, reply_crypto);
krb5_free_keyblock_contents(context, &kdc_contribution_key);
free_PA_PK_AS_REP(&rep);
goto out;
}
ASN1_MALLOC_ENCODE(EncryptionKey, kckdata, kcklen,
&kdc_contribution_key, &size, ret);
krb5_free_keyblock_contents(context, &kdc_contribution_key);
if (ret) {
krb5_set_error_message(context, ret, "encoding of PKINIT-KX Key failed %d", ret);
krb5_crypto_destroy(context, reply_crypto);
free_PA_PK_AS_REP(&rep);
goto out;
}
if (kcklen != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
ret = krb5_encrypt_EncryptedData(context, reply_crypto, KRB5_KU_PA_PKINIT_KX,
kckdata, kcklen, 0, &kx);
krb5_crypto_destroy(context, reply_crypto);
free(kckdata);
if (ret) {
free_PA_PK_AS_REP(&rep);
goto out;
}
ASN1_MALLOC_ENCODE(EncryptedData, kxdata, kxlen,
&kx, &size, ret);
free_EncryptedData(&kx);
if (ret) {
krb5_set_error_message(context, ret, "encoding of PKINIT-KX failed %d", ret);
free_PA_PK_AS_REP(&rep);
goto out;
}
if (kxlen != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
/* Add PA-PKINIT-KX */
ret = krb5_padata_add(context, md, KRB5_PADATA_PKINIT_KX, kxdata, kxlen);
if (ret) {
krb5_set_error_message(context, ret,
"Failed adding PKINIT-KX %d", ret);
free(buf);
goto out;
}
}
}
#define use_btmm_with_enckey 0
if (use_btmm_with_enckey && rep.element == choice_PA_PK_AS_REP_encKeyPack) {
PA_PK_AS_REP_BTMM btmm;
heim_any any;
any.data = rep.u.encKeyPack.data;
any.length = rep.u.encKeyPack.length;
btmm.dhSignedData = NULL;
btmm.encKeyPack = &any;
ASN1_MALLOC_ENCODE(PA_PK_AS_REP_BTMM, buf, len, &btmm, &size, ret);
} else {
ASN1_MALLOC_ENCODE(PA_PK_AS_REP, buf, len, &rep, &size, ret);
}
free_PA_PK_AS_REP(&rep);
if (ret) {
krb5_set_error_message(context, ret,
"encode PA-PK-AS-REP failed %d", ret);
goto out;
}
if (len != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
kdc_log(context, config, 0, "PK-INIT using %s %s", type, other);
} else if (cp->type == PKINIT_WIN2K) {
PA_PK_AS_REP_Win2k rep;
ContentInfo info;
if (cp->keyex != USE_RSA) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"Windows PK-INIT doesn't support DH");
goto out;
}
memset(&rep, 0, sizeof(rep));
pa_type = KRB5_PADATA_PK_AS_REP_19;
rep.element = choice_PA_PK_AS_REP_Win2k_encKeyPack;
ret = krb5_generate_random_keyblock(context, enctype,
&cp->reply_key);
if (ret) {
free_PA_PK_AS_REP_Win2k(&rep);
goto out;
}
ret = pk_mk_pa_reply_enckey(context,
config,
cp,
req,
req_buffer,
&cp->reply_key,
&info,
&kdc_cert);
if (ret) {
free_PA_PK_AS_REP_Win2k(&rep);
goto out;
}
ASN1_MALLOC_ENCODE(ContentInfo, rep.u.encKeyPack.data,
rep.u.encKeyPack.length, &info, &size,
ret);
free_ContentInfo(&info);
if (ret) {
krb5_set_error_message(context, ret, "encoding of Key ContentInfo "
"failed %d", ret);
free_PA_PK_AS_REP_Win2k(&rep);
goto out;
}
if (rep.u.encKeyPack.length != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
ASN1_MALLOC_ENCODE(PA_PK_AS_REP_Win2k, buf, len, &rep, &size, ret);
free_PA_PK_AS_REP_Win2k(&rep);
if (ret) {
krb5_set_error_message(context, ret,
"encode PA-PK-AS-REP-Win2k failed %d", ret);
goto out;
}
if (len != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
ret = krb5_generate_random_keyblock(context, sessionetype,
sessionkey);
if (ret) {
free(buf);
goto out;
}
} else
krb5_abortx(context, "PK-INIT internal error");
ret = krb5_padata_add(context, md, pa_type, buf, len);
if (ret) {
krb5_set_error_message(context, ret,
"Failed adding PA-PK-AS-REP %d", ret);
free(buf);
goto out;
}
if (config->pkinit_kdc_ocsp_file) {
if (ocsp.expire == 0 && ocsp.next_update > kdc_time) {
struct stat sb;
int fd;
krb5_data_free(&ocsp.data);
ocsp.expire = 0;
ocsp.next_update = kdc_time + 60 * 5;
fd = open(config->pkinit_kdc_ocsp_file, O_RDONLY);
if (fd < 0) {
kdc_log(context, config, 0,
"PK-INIT failed to open ocsp data file %d", errno);
goto out_ocsp;
}
ret = fstat(fd, &sb);
if (ret) {
ret = errno;
close(fd);
kdc_log(context, config, 0,
"PK-INIT failed to stat ocsp data %d", ret);
goto out_ocsp;
}
ret = krb5_data_alloc(&ocsp.data, sb.st_size);
if (ret) {
close(fd);
kdc_log(context, config, 0,
"PK-INIT failed to stat ocsp data %d", ret);
goto out_ocsp;
}
ocsp.data.length = sb.st_size;
ret = read(fd, ocsp.data.data, sb.st_size);
close(fd);
if (ret != sb.st_size) {
kdc_log(context, config, 0,
"PK-INIT failed to read ocsp data %d", errno);
goto out_ocsp;
}
ret = hx509_ocsp_verify(context->hx509ctx,
kdc_time,
kdc_cert,
0,
ocsp.data.data, ocsp.data.length,
&ocsp.expire);
if (ret) {
kdc_log(context, config, 0,
"PK-INIT failed to verify ocsp data %d", ret);
krb5_data_free(&ocsp.data);
ocsp.expire = 0;
} else if (ocsp.expire > 180) {
ocsp.expire -= 180; /* refetch the ocsp before it expire */
ocsp.next_update = ocsp.expire;
} else {
ocsp.next_update = kdc_time;
}
out_ocsp:
ret = 0;
}
if (ocsp.expire != 0 && ocsp.expire > kdc_time) {
ret = krb5_padata_add(context, md,
KRB5_PADATA_PA_PK_OCSP_RESPONSE,
ocsp.data.data, ocsp.data.length);
if (ret) {
krb5_set_error_message(context, ret,
"Failed adding OCSP response %d", ret);
goto out;
}
}
}
out:
if (kdc_cert)
hx509_cert_free(kdc_cert);
if (ret == 0)
ret = krb5_copy_keyblock_contents(context, &cp->reply_key, reply_key);
return ret;
}
static krb5_error_code
fix_transited_encoding(krb5_context context,
krb5_kdc_configuration *config,
krb5_boolean check_policy,
const TransitedEncoding *tr,
EncTicketPart *et,
const char *client_realm,
const char *server_realm,
const char *tgt_realm)
{
krb5_error_code ret = 0;
char **realms, **tmp;
int num_realms;
int i;
switch (tr->tr_type) {
case DOMAIN_X500_COMPRESS:
break;
case 0:
/*
* Allow empty content of type 0 because that is was Microsoft
* generates in their TGT.
*/
if (tr->contents.length == 0)
break;
kdc_log(context, config, 0,
"Transited type 0 with non empty content");
return KRB5KDC_ERR_TRTYPE_NOSUPP;
default:
kdc_log(context, config, 0,
"Unknown transited type: %u", tr->tr_type);
return KRB5KDC_ERR_TRTYPE_NOSUPP;
}
ret = krb5_domain_x500_decode(context,
tr->contents,
&realms,
&num_realms,
client_realm,
server_realm);
if(ret){
krb5_warn(context, ret,
"Decoding transited encoding");
return ret;
}
if(strcmp(client_realm, tgt_realm) && strcmp(server_realm, tgt_realm)) {
/* not us, so add the previous realm to transited set */
if (num_realms < 0 || num_realms + 1 > UINT_MAX/sizeof(*realms)) {
ret = ERANGE;
goto free_realms;
}
tmp = realloc(realms, (num_realms + 1) * sizeof(*realms));
if(tmp == NULL){
ret = ENOMEM;
goto free_realms;
}
realms = tmp;
realms[num_realms] = strdup(tgt_realm);
if(realms[num_realms] == NULL){
ret = ENOMEM;
goto free_realms;
}
num_realms++;
}
if(num_realms == 0) {
if(strcmp(client_realm, server_realm))
kdc_log(context, config, 0,
"cross-realm %s -> %s", client_realm, server_realm);
} else {
size_t l = 0;
char *rs;
for(i = 0; i < num_realms; i++)
l += strlen(realms[i]) + 2;
rs = malloc(l);
if(rs != NULL) {
*rs = '\0';
for(i = 0; i < num_realms; i++) {
if(i > 0)
strlcat(rs, ", ", l);
strlcat(rs, realms[i], l);
}
kdc_log(context, config, 0,
"cross-realm %s -> %s via [%s]",
client_realm, server_realm, rs);
free(rs);
}
}
if(check_policy) {
ret = krb5_check_transited(context, client_realm,
server_realm,
realms, num_realms, NULL);
if(ret) {
krb5_warn(context, ret, "cross-realm %s -> %s",
client_realm, server_realm);
goto free_realms;
}
et->flags.transited_policy_checked = 1;
}
et->transited.tr_type = DOMAIN_X500_COMPRESS;
ret = krb5_domain_x500_encode(realms, num_realms, &et->transited.contents);
if(ret)
krb5_warn(context, ret, "Encoding transited encoding");
free_realms:
for(i = 0; i < num_realms; i++)
free(realms[i]);
free(realms);
return ret;
}
static krb5_error_code
tgs_check_authenticator(krb5_context context,
krb5_kdc_configuration *config,
krb5_auth_context ac,
KDC_REQ_BODY *b,
const char **e_text,
krb5_keyblock *key)
{
krb5_authenticator auth;
size_t len;
unsigned char *buf;
size_t buf_size;
krb5_error_code ret;
krb5_crypto crypto;
krb5_auth_con_getauthenticator(context, ac, &auth);
if(auth->cksum == NULL){
kdc_log(context, config, 0, "No authenticator in request");
ret = KRB5KRB_AP_ERR_INAPP_CKSUM;
goto out;
}
/*
* according to RFC1510 it doesn't need to be keyed,
* but according to the latest draft it needs to.
*/
if (
#if 0
!krb5_checksum_is_keyed(context, auth->cksum->cksumtype)
||
#endif
!krb5_checksum_is_collision_proof(context, auth->cksum->cksumtype)) {
kdc_log(context, config, 0, "Bad checksum type in authenticator: %d",
auth->cksum->cksumtype);
ret = KRB5KRB_AP_ERR_INAPP_CKSUM;
goto out;
}
/* XXX should not re-encode this */
ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, b, &len, ret);
if(ret){
kdc_log(context, config, 0, "Failed to encode KDC-REQ-BODY: %s",
krb5_get_err_text(context, ret));
goto out;
}
if(buf_size != len) {
free(buf);
kdc_log(context, config, 0, "Internal error in ASN.1 encoder");
*e_text = "KDC internal error";
ret = KRB5KRB_ERR_GENERIC;
goto out;
}
ret = krb5_crypto_init(context, key, 0, &crypto);
if (ret) {
free(buf);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
krb5_get_err_text(context, ret));
goto out;
}
ret = krb5_verify_checksum(context,
crypto,
KRB5_KU_TGS_REQ_AUTH_CKSUM,
buf,
len,
auth->cksum);
free(buf);
krb5_crypto_destroy(context, crypto);
if(ret){
kdc_log(context, config, 0,
"Failed to verify authenticator checksum: %s",
krb5_get_err_text(context, ret));
}
out:
free_Authenticator(auth);
free(auth);
return ret;
}
krb5_error_code
_kdc_pk_rd_padata(krb5_context context,
krb5_kdc_configuration *config,
const KDC_REQ *req,
const PA_DATA *pa,
hdb_entry_ex *client,
pk_client_params **ret_params)
{
pk_client_params *cp;
krb5_error_code ret;
heim_oid eContentType = { 0, NULL }, contentInfoOid = { 0, NULL };
krb5_data eContent = { 0, NULL };
krb5_data signed_content = { 0, NULL };
const char *type = "unknown type";
hx509_certs trust_anchors;
int have_data = 0;
const HDB_Ext_PKINIT_cert *pc;
*ret_params = NULL;
if (!config->enable_pkinit) {
kdc_log(context, config, 0, "PK-INIT request but PK-INIT not enabled");
krb5_clear_error_message(context);
return 0;
}
cp = calloc(1, sizeof(*cp));
if (cp == NULL) {
krb5_clear_error_message(context);
ret = ENOMEM;
goto out;
}
ret = hx509_certs_init(context->hx509ctx,
"MEMORY:trust-anchors",
0, NULL, &trust_anchors);
if (ret) {
krb5_set_error_message(context, ret, "failed to create trust anchors");
goto out;
}
ret = hx509_certs_merge(context->hx509ctx, trust_anchors,
kdc_identity->anchors);
if (ret) {
hx509_certs_free(&trust_anchors);
krb5_set_error_message(context, ret, "failed to create verify context");
goto out;
}
/* Add any registered certificates for this client as trust anchors */
ret = hdb_entry_get_pkinit_cert(&client->entry, &pc);
if (ret == 0 && pc != NULL) {
hx509_cert cert;
unsigned int i;
for (i = 0; i < pc->len; i++) {
cert = hx509_cert_init_data(context->hx509ctx,
pc->val[i].cert.data,
pc->val[i].cert.length,
NULL);
if (cert == NULL)
continue;
hx509_certs_add(context->hx509ctx, trust_anchors, cert);
hx509_cert_free(cert);
}
}
ret = hx509_verify_init_ctx(context->hx509ctx, &cp->verify_ctx);
if (ret) {
hx509_certs_free(&trust_anchors);
krb5_set_error_message(context, ret, "failed to create verify context");
goto out;
}
hx509_verify_set_time(cp->verify_ctx, kdc_time);
hx509_verify_attach_anchors(cp->verify_ctx, trust_anchors);
hx509_certs_free(&trust_anchors);
if (config->pkinit_allow_proxy_certs)
hx509_verify_set_proxy_certificate(cp->verify_ctx, 1);
if (pa->padata_type == KRB5_PADATA_PK_AS_REQ_WIN) {
PA_PK_AS_REQ_Win2k r;
type = "PK-INIT-Win2k";
if (_kdc_is_anon_request(&req->req_body)) {
ret = KRB5_KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED;
krb5_set_error_message(context, ret,
"Anon not supported in RSA mode");
goto out;
}
ret = decode_PA_PK_AS_REQ_Win2k(pa->padata_value.data,
pa->padata_value.length,
&r,
NULL);
if (ret) {
krb5_set_error_message(context, ret, "Can't decode "
"PK-AS-REQ-Win2k: %d", ret);
goto out;
}
ret = hx509_cms_unwrap_ContentInfo(&r.signed_auth_pack,
&contentInfoOid,
&signed_content,
&have_data);
free_PA_PK_AS_REQ_Win2k(&r);
if (ret) {
krb5_set_error_message(context, ret,
"Can't unwrap ContentInfo(win): %d", ret);
goto out;
}
} else if (pa->padata_type == KRB5_PADATA_PK_AS_REQ) {
PA_PK_AS_REQ r;
type = "PK-INIT-IETF";
ret = decode_PA_PK_AS_REQ(pa->padata_value.data,
pa->padata_value.length,
&r,
NULL);
if (ret) {
krb5_set_error_message(context, ret,
"Can't decode PK-AS-REQ: %d", ret);
goto out;
}
/* XXX look at r.kdcPkId */
if (r.trustedCertifiers) {
ExternalPrincipalIdentifiers *edi = r.trustedCertifiers;
unsigned int i, maxedi;
ret = hx509_certs_init(context->hx509ctx,
"MEMORY:client-anchors",
0, NULL,
&cp->client_anchors);
if (ret) {
krb5_set_error_message(context, ret,
"Can't allocate client anchors: %d",
ret);
goto out;
}
/*
* If the client sent more then 10 EDI, don't bother
* looking more then 10 of performance reasons.
*/
maxedi = edi->len;
if (maxedi > 10)
maxedi = 10;
for (i = 0; i < maxedi; i++) {
IssuerAndSerialNumber iasn;
hx509_query *q;
hx509_cert cert;
size_t size;
if (edi->val[i].issuerAndSerialNumber == NULL)
continue;
ret = hx509_query_alloc(context->hx509ctx, &q);
if (ret) {
krb5_set_error_message(context, ret,
"Failed to allocate hx509_query");
goto out;
}
ret = decode_IssuerAndSerialNumber(edi->val[i].issuerAndSerialNumber->data,
edi->val[i].issuerAndSerialNumber->length,
&iasn,
&size);
if (ret) {
hx509_query_free(context->hx509ctx, q);
continue;
}
ret = hx509_query_match_issuer_serial(q, &iasn.issuer, &iasn.serialNumber);
free_IssuerAndSerialNumber(&iasn);
if (ret) {
hx509_query_free(context->hx509ctx, q);
continue;
}
ret = hx509_certs_find(context->hx509ctx,
kdc_identity->certs,
q,
&cert);
hx509_query_free(context->hx509ctx, q);
if (ret)
continue;
hx509_certs_add(context->hx509ctx,
cp->client_anchors, cert);
hx509_cert_free(cert);
}
}
ret = hx509_cms_unwrap_ContentInfo(&r.signedAuthPack,
&contentInfoOid,
&signed_content,
&have_data);
free_PA_PK_AS_REQ(&r);
if (ret) {
krb5_set_error_message(context, ret,
"Can't unwrap ContentInfo: %d", ret);
goto out;
}
} else {
krb5_clear_error_message(context);
ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
goto out;
}
ret = der_heim_oid_cmp(&contentInfoOid, &asn1_oid_id_pkcs7_signedData);
if (ret != 0) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"PK-AS-REQ-Win2k invalid content type oid");
goto out;
}
if (!have_data) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"PK-AS-REQ-Win2k no signed auth pack");
goto out;
}
{
hx509_certs signer_certs;
int flags = HX509_CMS_VS_ALLOW_DATA_OID_MISMATCH; /* BTMM */
if (_kdc_is_anon_request(&req->req_body))
flags |= HX509_CMS_VS_ALLOW_ZERO_SIGNER;
ret = hx509_cms_verify_signed(context->hx509ctx,
cp->verify_ctx,
flags,
signed_content.data,
signed_content.length,
NULL,
kdc_identity->certpool,
&eContentType,
&eContent,
&signer_certs);
if (ret) {
char *s = hx509_get_error_string(context->hx509ctx, ret);
krb5_warnx(context, "PKINIT: failed to verify signature: %s: %d",
s, ret);
free(s);
goto out;
}
if (signer_certs) {
ret = hx509_get_one_cert(context->hx509ctx, signer_certs,
&cp->cert);
hx509_certs_free(&signer_certs);
}
if (ret)
goto out;
}
/* Signature is correct, now verify the signed message */
if (der_heim_oid_cmp(&eContentType, &asn1_oid_id_pkcs7_data) != 0 &&
der_heim_oid_cmp(&eContentType, &asn1_oid_id_pkauthdata) != 0)
{
ret = KRB5_BADMSGTYPE;
krb5_set_error_message(context, ret, "got wrong oid for pkauthdata");
goto out;
}
if (pa->padata_type == KRB5_PADATA_PK_AS_REQ_WIN) {
AuthPack_Win2k ap;
ret = decode_AuthPack_Win2k(eContent.data,
eContent.length,
&ap,
NULL);
if (ret) {
krb5_set_error_message(context, ret,
"Can't decode AuthPack: %d", ret);
goto out;
}
ret = pk_check_pkauthenticator_win2k(context,
&ap.pkAuthenticator,
req);
if (ret) {
free_AuthPack_Win2k(&ap);
goto out;
}
cp->type = PKINIT_WIN2K;
cp->nonce = ap.pkAuthenticator.nonce;
if (ap.clientPublicValue) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"DH not supported for windows");
goto out;
}
free_AuthPack_Win2k(&ap);
} else if (pa->padata_type == KRB5_PADATA_PK_AS_REQ) {
AuthPack ap;
ret = decode_AuthPack(eContent.data,
eContent.length,
&ap,
NULL);
if (ret) {
krb5_set_error_message(context, ret,
"Can't decode AuthPack: %d", ret);
free_AuthPack(&ap);
goto out;
}
if (_kdc_is_anon_request(&req->req_body) &&
ap.clientPublicValue == NULL) {
free_AuthPack(&ap);
ret = KRB5_KDC_ERR_PUBLIC_KEY_ENCRYPTION_NOT_SUPPORTED;
krb5_set_error_message(context, ret,
"Anon not supported in RSA mode");
goto out;
}
ret = pk_check_pkauthenticator(context,
&ap.pkAuthenticator,
req);
if (ret) {
free_AuthPack(&ap);
goto out;
}
cp->type = PKINIT_27;
cp->nonce = ap.pkAuthenticator.nonce;
if (ap.clientPublicValue) {
if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_dhpublicnumber) == 0) {
cp->keyex = USE_DH;
ret = get_dh_param(context, config,
ap.clientPublicValue, cp);
} else if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_ecPublicKey) == 0) {
cp->keyex = USE_ECDH;
ret = _kdc_get_ecdh_param(context, config,
ap.clientPublicValue,
&cp->u.ecdh.public_key);
} else {
ret = KRB5_BADMSGTYPE;
krb5_set_error_message(context, ret, "PKINIT unknown DH mechanism");
}
if (ret) {
free_AuthPack(&ap);
goto out;
}
} else
cp->keyex = USE_RSA;
ret = hx509_peer_info_alloc(context->hx509ctx,
&cp->peer);
if (ret) {
free_AuthPack(&ap);
goto out;
}
if (ap.supportedCMSTypes) {
ret = hx509_peer_info_set_cms_algs(context->hx509ctx,
cp->peer,
ap.supportedCMSTypes->val,
ap.supportedCMSTypes->len);
if (ret) {
free_AuthPack(&ap);
goto out;
}
} else {
/* assume old client */
hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
hx509_crypto_des_rsdi_ede3_cbc());
hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
hx509_signature_rsa_with_sha1());
hx509_peer_info_add_cms_alg(context->hx509ctx, cp->peer,
hx509_signature_sha1());
}
free_AuthPack(&ap);
} else
krb5_abortx(context, "internal pkinit error");
kdc_log(context, config, 0, "PK-INIT request of type %s", type);
out:
if (ret)
krb5_warn(context, ret, "PKINIT");
if (signed_content.data)
free(signed_content.data);
krb5_data_free(&eContent);
der_free_oid(&eContentType);
der_free_oid(&contentInfoOid);
if (ret) {
_kdc_pk_free_client_param(context, cp);
} else
*ret_params = cp;
return ret;
}
krb5_error_code
_kdc_pk_check_client(krb5_context context,
krb5_kdc_configuration *config,
HDB *clientdb,
hdb_entry_ex *client,
pk_client_params *cp,
char **subject_name)
{
const HDB_Ext_PKINIT_acl *acl;
const HDB_Ext_PKINIT_cert *pc;
krb5_error_code ret;
hx509_name name;
size_t i;
if (cp->cert == NULL) {
*subject_name = strdup("anonymous client client");
if (*subject_name == NULL)
return ENOMEM;
return 0;
}
ret = hx509_cert_get_base_subject(context->hx509ctx,
cp->cert,
&name);
if (ret)
return ret;
ret = hx509_name_to_string(name, subject_name);
hx509_name_free(&name);
if (ret)
return ret;
kdc_log(context, config, 0,
"Trying to authorize PK-INIT subject DN %s",
*subject_name);
ret = hdb_entry_get_pkinit_cert(&client->entry, &pc);
if (ret == 0 && pc) {
hx509_cert cert;
size_t j;
for (j = 0; j < pc->len; j++) {
cert = hx509_cert_init_data(context->hx509ctx,
pc->val[j].cert.data,
pc->val[j].cert.length,
NULL);
if (cert == NULL)
continue;
ret = hx509_cert_cmp(cert, cp->cert);
hx509_cert_free(cert);
if (ret == 0) {
kdc_log(context, config, 5,
"Found matching PK-INIT cert in hdb");
return 0;
}
}
}
if (config->pkinit_princ_in_cert) {
ret = match_rfc_san(context, config,
context->hx509ctx,
cp->cert,
client->entry.principal);
if (ret == 0) {
kdc_log(context, config, 5,
"Found matching PK-INIT SAN in certificate");
return 0;
}
ret = match_ms_upn_san(context, config,
context->hx509ctx,
cp->cert,
clientdb,
client);
if (ret == 0) {
kdc_log(context, config, 5,
"Found matching MS UPN SAN in certificate");
return 0;
}
}
ret = hdb_entry_get_pkinit_acl(&client->entry, &acl);
if (ret == 0 && acl != NULL) {
/*
* Cheat here and compare the generated name with the string
* and not the reverse.
*/
for (i = 0; i < acl->len; i++) {
if (strcmp(*subject_name, acl->val[0].subject) != 0)
continue;
/* Don't support isser and anchor checking right now */
if (acl->val[0].issuer)
continue;
if (acl->val[0].anchor)
continue;
kdc_log(context, config, 5,
"Found matching PK-INIT database ACL");
return 0;
}
}
for (i = 0; i < principal_mappings.len; i++) {
krb5_boolean b;
b = krb5_principal_compare(context,
client->entry.principal,
principal_mappings.val[i].principal);
if (b == FALSE)
continue;
if (strcmp(principal_mappings.val[i].subject, *subject_name) != 0)
continue;
kdc_log(context, config, 5,
"Found matching PK-INIT FILE ACL");
return 0;
}
ret = KRB5_KDC_ERR_CLIENT_NAME_MISMATCH;
krb5_set_error_message(context, ret,
"PKINIT no matching principals for %s",
*subject_name);
kdc_log(context, config, 5,
"PKINIT no matching principals for %s",
*subject_name);
free(*subject_name);
*subject_name = NULL;
return ret;
}
static krb5_error_code
check_tgs_flags(krb5_context context,
krb5_kdc_configuration *config,
KDC_REQ_BODY *b, const EncTicketPart *tgt, EncTicketPart *et)
{
KDCOptions f = b->kdc_options;
if(f.validate){
if(!tgt->flags.invalid || tgt->starttime == NULL){
kdc_log(context, config, 0,
"Bad request to validate ticket");
return KRB5KDC_ERR_BADOPTION;
}
if(*tgt->starttime > kdc_time){
kdc_log(context, config, 0,
"Early request to validate ticket");
return KRB5KRB_AP_ERR_TKT_NYV;
}
/* XXX tkt = tgt */
et->flags.invalid = 0;
}else if(tgt->flags.invalid){
kdc_log(context, config, 0,
"Ticket-granting ticket has INVALID flag set");
return KRB5KRB_AP_ERR_TKT_INVALID;
}
if(f.forwardable){
if(!tgt->flags.forwardable){
kdc_log(context, config, 0,
"Bad request for forwardable ticket");
return KRB5KDC_ERR_BADOPTION;
}
et->flags.forwardable = 1;
}
if(f.forwarded){
if(!tgt->flags.forwardable){
kdc_log(context, config, 0,
"Request to forward non-forwardable ticket");
return KRB5KDC_ERR_BADOPTION;
}
et->flags.forwarded = 1;
et->caddr = b->addresses;
}
if(tgt->flags.forwarded)
et->flags.forwarded = 1;
if(f.proxiable){
if(!tgt->flags.proxiable){
kdc_log(context, config, 0,
"Bad request for proxiable ticket");
return KRB5KDC_ERR_BADOPTION;
}
et->flags.proxiable = 1;
}
if(f.proxy){
if(!tgt->flags.proxiable){
kdc_log(context, config, 0,
"Request to proxy non-proxiable ticket");
return KRB5KDC_ERR_BADOPTION;
}
et->flags.proxy = 1;
et->caddr = b->addresses;
}
if(tgt->flags.proxy)
et->flags.proxy = 1;
if(f.allow_postdate){
if(!tgt->flags.may_postdate){
kdc_log(context, config, 0,
"Bad request for post-datable ticket");
return KRB5KDC_ERR_BADOPTION;
}
et->flags.may_postdate = 1;
}
if(f.postdated){
if(!tgt->flags.may_postdate){
kdc_log(context, config, 0,
"Bad request for postdated ticket");
return KRB5KDC_ERR_BADOPTION;
}
if(b->from)
*et->starttime = *b->from;
et->flags.postdated = 1;
et->flags.invalid = 1;
}else if(b->from && *b->from > kdc_time + context->max_skew){
kdc_log(context, config, 0, "Ticket cannot be postdated");
return KRB5KDC_ERR_CANNOT_POSTDATE;
}
if(f.renewable){
if(!tgt->flags.renewable){
kdc_log(context, config, 0,
"Bad request for renewable ticket");
return KRB5KDC_ERR_BADOPTION;
}
et->flags.renewable = 1;
ALLOC(et->renew_till);
_kdc_fix_time(&b->rtime);
*et->renew_till = *b->rtime;
}
if(f.renew){
time_t old_life;
if(!tgt->flags.renewable || tgt->renew_till == NULL){
kdc_log(context, config, 0,
"Request to renew non-renewable ticket");
return KRB5KDC_ERR_BADOPTION;
}
old_life = tgt->endtime;
if(tgt->starttime)
old_life -= *tgt->starttime;
else
old_life -= tgt->authtime;
et->endtime = *et->starttime + old_life;
if (et->renew_till != NULL)
et->endtime = min(*et->renew_till, et->endtime);
}
#if 0
/* checks for excess flags */
if(f.request_anonymous && !config->allow_anonymous){
kdc_log(context, config, 0,
"Request for anonymous ticket");
return KRB5KDC_ERR_BADOPTION;
}
#endif
return 0;
}
krb5_error_code
_kdc_tgs_rep(krb5_context context,
krb5_kdc_configuration *config,
KDC_REQ *req,
krb5_data *data,
const char *from,
struct sockaddr *from_addr,
int datagram_reply)
{
AuthorizationData *auth_data = NULL;
krb5_error_code ret;
int i = 0;
const PA_DATA *tgs_req;
hdb_entry_ex *krbtgt = NULL;
krb5_ticket *ticket = NULL;
const char *e_text = NULL;
krb5_enctype krbtgt_etype = ETYPE_NULL;
time_t *csec = NULL;
int *cusec = NULL;
if(req->padata == NULL){
ret = KRB5KDC_ERR_PREAUTH_REQUIRED; /* XXX ??? */
kdc_log(context, config, 0,
"TGS-REQ from %s without PA-DATA", from);
goto out;
}
tgs_req = _kdc_find_padata(req, &i, KRB5_PADATA_TGS_REQ);
if(tgs_req == NULL){
ret = KRB5KDC_ERR_PADATA_TYPE_NOSUPP;
kdc_log(context, config, 0,
"TGS-REQ from %s without PA-TGS-REQ", from);
goto out;
}
ret = tgs_parse_request(context, config,
&req->req_body, tgs_req,
&krbtgt,
&krbtgt_etype,
&ticket,
&e_text,
from, from_addr,
&csec, &cusec,
&auth_data);
if (ret) {
kdc_log(context, config, 0,
"Failed parsing TGS-REQ from %s", from);
goto out;
}
ret = tgs_build_reply(context,
config,
req,
&req->req_body,
krbtgt,
krbtgt_etype,
ticket,
data,
from,
&e_text,
auth_data,
from_addr,
datagram_reply);
if (ret) {
kdc_log(context, config, 0,
"Failed building TGS-REP to %s", from);
goto out;
}
/* */
if (datagram_reply && data->length > config->max_datagram_reply_length) {
krb5_data_free(data);
ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
e_text = "Reply packet too large";
}
out:
if(ret && data->data == NULL){
krb5_mk_error(context,
ret,
NULL,
NULL,
NULL,
NULL,
csec,
cusec,
data);
}
free(csec);
free(cusec);
if (ticket)
krb5_free_ticket(context, ticket);
if(krbtgt)
_kdc_free_ent(context, krbtgt);
if (auth_data) {
free_AuthorizationData(auth_data);
free(auth_data);
}
return 0;
}
static krb5_error_code
tgs_build_reply(krb5_context context,
krb5_kdc_configuration *config,
KDC_REQ *req,
KDC_REQ_BODY *b,
hdb_entry_ex *krbtgt,
krb5_enctype krbtgt_etype,
krb5_ticket *ticket,
krb5_data *reply,
const char *from,
const char **e_text,
AuthorizationData *auth_data,
const struct sockaddr *from_addr,
int datagram_reply)
{
krb5_error_code ret;
krb5_principal cp = NULL, sp = NULL;
krb5_principal client_principal = NULL;
char *spn = NULL, *cpn = NULL;
hdb_entry_ex *server = NULL, *client = NULL;
EncTicketPart *tgt = &ticket->ticket;
KRB5SignedPathPrincipals *spp = NULL;
const EncryptionKey *ekey;
krb5_keyblock sessionkey;
krb5_kvno kvno;
krb5_data rspac;
int cross_realm = 0;
PrincipalName *s;
Realm r;
int nloop = 0;
EncTicketPart adtkt;
char opt_str[128];
int require_signedpath = 0;
memset(&sessionkey, 0, sizeof(sessionkey));
memset(&adtkt, 0, sizeof(adtkt));
krb5_data_zero(&rspac);
s = b->sname;
r = b->realm;
if(b->kdc_options.enc_tkt_in_skey){
Ticket *t;
hdb_entry_ex *uu;
krb5_principal p;
Key *uukey;
if(b->additional_tickets == NULL ||
b->additional_tickets->len == 0){
ret = KRB5KDC_ERR_BADOPTION; /* ? */
kdc_log(context, config, 0,
"No second ticket present in request");
goto out;
}
t = &b->additional_tickets->val[0];
if(!get_krbtgt_realm(&t->sname)){
kdc_log(context, config, 0,
"Additional ticket is not a ticket-granting ticket");
ret = KRB5KDC_ERR_POLICY;
goto out;
}
_krb5_principalname2krb5_principal(context, &p, t->sname, t->realm);
ret = _kdc_db_fetch(context, config, p,
HDB_F_GET_CLIENT|HDB_F_GET_SERVER,
NULL, &uu);
krb5_free_principal(context, p);
if(ret){
if (ret == HDB_ERR_NOENTRY)
ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto out;
}
ret = hdb_enctype2key(context, &uu->entry,
t->enc_part.etype, &uukey);
if(ret){
_kdc_free_ent(context, uu);
ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
goto out;
}
ret = krb5_decrypt_ticket(context, t, &uukey->key, &adtkt, 0);
_kdc_free_ent(context, uu);
if(ret)
goto out;
ret = verify_flags(context, config, &adtkt, spn);
if (ret)
goto out;
s = &adtkt.cname;
r = adtkt.crealm;
}
_krb5_principalname2krb5_principal(context, &sp, *s, r);
ret = krb5_unparse_name(context, sp, &spn);
if (ret)
goto out;
_krb5_principalname2krb5_principal(context, &cp, tgt->cname, tgt->crealm);
ret = krb5_unparse_name(context, cp, &cpn);
if (ret)
goto out;
unparse_flags (KDCOptions2int(b->kdc_options),
asn1_KDCOptions_units(),
opt_str, sizeof(opt_str));
if(*opt_str)
kdc_log(context, config, 0,
"TGS-REQ %s from %s for %s [%s]",
cpn, from, spn, opt_str);
else
kdc_log(context, config, 0,
"TGS-REQ %s from %s for %s", cpn, from, spn);
/*
* Fetch server
*/
server_lookup:
ret = _kdc_db_fetch(context, config, sp, HDB_F_GET_SERVER, NULL, &server);
if(ret){
const char *new_rlm;
Realm req_rlm;
krb5_realm *realms;
if ((req_rlm = get_krbtgt_realm(&sp->name)) != NULL) {
if(nloop++ < 2) {
new_rlm = find_rpath(context, tgt->crealm, req_rlm);
if(new_rlm) {
kdc_log(context, config, 5, "krbtgt for realm %s "
"not found, trying %s",
req_rlm, new_rlm);
krb5_free_principal(context, sp);
free(spn);
krb5_make_principal(context, &sp, r,
KRB5_TGS_NAME, new_rlm, NULL);
ret = krb5_unparse_name(context, sp, &spn);
if (ret)
goto out;
goto server_lookup;
}
}
} else if(need_referral(context, sp, &realms)) {
if (strcmp(realms[0], sp->realm) != 0) {
kdc_log(context, config, 5,
"Returning a referral to realm %s for "
"server %s that was not found",
realms[0], spn);
krb5_free_principal(context, sp);
free(spn);
krb5_make_principal(context, &sp, r, KRB5_TGS_NAME,
realms[0], NULL);
ret = krb5_unparse_name(context, sp, &spn);
if (ret)
goto out;
krb5_free_host_realm(context, realms);
goto server_lookup;
}
krb5_free_host_realm(context, realms);
}
kdc_log(context, config, 0,
"Server not found in database: %s: %s", spn,
krb5_get_err_text(context, ret));
if (ret == HDB_ERR_NOENTRY)
ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto out;
}
ret = _kdc_db_fetch(context, config, cp, HDB_F_GET_CLIENT, NULL, &client);
if(ret) {
const char *krbtgt_realm;
/*
* If the client belongs to the same realm as our krbtgt, it
* should exist in the local database.
*
*/
krbtgt_realm =
krb5_principal_get_comp_string(context,
krbtgt->entry.principal, 1);
if(strcmp(krb5_principal_get_realm(context, cp), krbtgt_realm) == 0) {
if (ret == HDB_ERR_NOENTRY)
ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
kdc_log(context, config, 1, "Client no longer in database: %s",
cpn);
goto out;
}
kdc_log(context, config, 1, "Client not found in database: %s: %s",
cpn, krb5_get_err_text(context, ret));
cross_realm = 1;
}
/*
* Check that service is in the same realm as the krbtgt. If its
* not the same, its someone that is using a uni-directional trust
* backward.
*/
if (strcmp(krb5_principal_get_realm(context, sp),
krb5_principal_get_comp_string(context,
krbtgt->entry.principal,
1)) != 0) {
char *tpn;
ret = krb5_unparse_name(context, krbtgt->entry.principal, &tpn);
kdc_log(context, config, 0,
"Request with wrong krbtgt: %s",
(ret == 0) ? tpn : "<unknown>");
if(ret == 0)
free(tpn);
ret = KRB5KRB_AP_ERR_NOT_US;
goto out;
}
/*
*
*/
client_principal = cp;
if (client) {
const PA_DATA *sdata;
int i = 0;
sdata = _kdc_find_padata(req, &i, KRB5_PADATA_S4U2SELF);
if (sdata) {
krb5_crypto crypto;
krb5_data datack;
PA_S4U2Self self;
char *selfcpn = NULL;
const char *str;
ret = decode_PA_S4U2Self(sdata->padata_value.data,
sdata->padata_value.length,
&self, NULL);
if (ret) {
kdc_log(context, config, 0, "Failed to decode PA-S4U2Self");
goto out;
}
ret = _krb5_s4u2self_to_checksumdata(context, &self, &datack);
if (ret)
goto out;
ret = krb5_crypto_init(context, &tgt->key, 0, &crypto);
if (ret) {
free_PA_S4U2Self(&self);
krb5_data_free(&datack);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
krb5_get_err_text(context, ret));
goto out;
}
ret = krb5_verify_checksum(context,
crypto,
KRB5_KU_OTHER_CKSUM,
datack.data,
datack.length,
&self.cksum);
krb5_data_free(&datack);
krb5_crypto_destroy(context, crypto);
if (ret) {
free_PA_S4U2Self(&self);
kdc_log(context, config, 0,
"krb5_verify_checksum failed for S4U2Self: %s",
krb5_get_err_text(context, ret));
goto out;
}
ret = _krb5_principalname2krb5_principal(context,
&client_principal,
self.name,
self.realm);
free_PA_S4U2Self(&self);
if (ret)
goto out;
ret = krb5_unparse_name(context, client_principal, &selfcpn);
if (ret)
goto out;
/*
* Check that service doing the impersonating is
* requesting a ticket to it-self.
*/
if (krb5_principal_compare(context, cp, sp) != TRUE) {
kdc_log(context, config, 0, "S4U2Self: %s is not allowed "
"to impersonate some other user "
"(tried for user %s to service %s)",
cpn, selfcpn, spn);
free(selfcpn);
ret = KRB5KDC_ERR_BADOPTION; /* ? */
goto out;
}
/*
* If the service isn't trusted for authentication to
* delegation, remove the forward flag.
*/
if (client->entry.flags.trusted_for_delegation) {
str = "[forwardable]";
} else {
b->kdc_options.forwardable = 0;
str = "";
}
kdc_log(context, config, 0, "s4u2self %s impersonating %s to "
"service %s %s", cpn, selfcpn, spn, str);
free(selfcpn);
}
}
/*
* Constrained delegation
*/
if (client != NULL
&& b->additional_tickets != NULL
&& b->additional_tickets->len != 0
&& b->kdc_options.enc_tkt_in_skey == 0)
{
Key *clientkey;
Ticket *t;
char *str;
t = &b->additional_tickets->val[0];
ret = hdb_enctype2key(context, &client->entry,
t->enc_part.etype, &clientkey);
if(ret){
ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
goto out;
}
ret = krb5_decrypt_ticket(context, t, &clientkey->key, &adtkt, 0);
if (ret) {
kdc_log(context, config, 0,
"failed to decrypt ticket for "
"constrained delegation from %s to %s ", spn, cpn);
goto out;
}
/* check that ticket is valid */
if (adtkt.flags.forwardable == 0) {
kdc_log(context, config, 0,
"Missing forwardable flag on ticket for "
"constrained delegation from %s to %s ", spn, cpn);
ret = KRB5KDC_ERR_ETYPE_NOSUPP; /* XXX */
goto out;
}
ret = check_constrained_delegation(context, config, client, sp);
if (ret) {
kdc_log(context, config, 0,
"constrained delegation from %s to %s not allowed",
spn, cpn);
goto out;
}
ret = _krb5_principalname2krb5_principal(context,
&client_principal,
adtkt.cname,
adtkt.crealm);
if (ret)
goto out;
ret = krb5_unparse_name(context, client_principal, &str);
if (ret)
goto out;
ret = verify_flags(context, config, &adtkt, str);
if (ret) {
free(str);
goto out;
}
/*
* Check KRB5SignedPath in authorization data and add new entry to
* make sure servers can't fake a ticket to us.
*/
ret = check_KRB5SignedPath(context,
config,
krbtgt,
&adtkt,
&spp,
1);
if (ret) {
kdc_log(context, config, 0,
"KRB5SignedPath check from service %s failed "
"for delegation to %s for client %s "
"from %s failed with %s",
spn, str, cpn, from, krb5_get_err_text(context, ret));
free(str);
goto out;
}
kdc_log(context, config, 0, "constrained delegation for %s "
"from %s to %s", str, cpn, spn);
free(str);
/*
* Also require that the KDC have issue the service's krbtgt
* used to do the request.
*/
require_signedpath = 1;
}
/*
* Check flags
*/
ret = _kdc_check_flags(context, config,
client, cpn,
server, spn,
FALSE);
if(ret)
goto out;
if((b->kdc_options.validate || b->kdc_options.renew) &&
!krb5_principal_compare(context,
krbtgt->entry.principal,
server->entry.principal)){
kdc_log(context, config, 0, "Inconsistent request.");
ret = KRB5KDC_ERR_SERVER_NOMATCH;
goto out;
}
/* check for valid set of addresses */
if(!_kdc_check_addresses(context, config, tgt->caddr, from_addr)) {
ret = KRB5KRB_AP_ERR_BADADDR;
kdc_log(context, config, 0, "Request from wrong address");
goto out;
}
/*
* Select enctype, return key and kvno.
*/
{
krb5_enctype etype;
if(b->kdc_options.enc_tkt_in_skey) {
int i;
ekey = &adtkt.key;
for(i = 0; i < b->etype.len; i++)
if (b->etype.val[i] == adtkt.key.keytype)
break;
if(i == b->etype.len) {
krb5_clear_error_string(context);
return KRB5KDC_ERR_ETYPE_NOSUPP;
}
etype = b->etype.val[i];
kvno = 0;
} else {
Key *skey;
ret = _kdc_find_etype(context, server, b->etype.val, b->etype.len,
&skey, &etype);
if(ret) {
kdc_log(context, config, 0,
"Server (%s) has no support for etypes", spp);
return ret;
}
ekey = &skey->key;
kvno = server->entry.kvno;
}
ret = krb5_generate_random_keyblock(context, etype, &sessionkey);
if (ret)
goto out;
}
/* check PAC if not cross realm and if there is one */
if (!cross_realm) {
Key *tkey;
ret = hdb_enctype2key(context, &krbtgt->entry,
krbtgt_etype, &tkey);
if(ret) {
kdc_log(context, config, 0,
"Failed to find key for krbtgt PAC check");
goto out;
}
ret = check_PAC(context, config, client_principal,
client, server, ekey, &tkey->key,
tgt, &rspac, &require_signedpath);
if (ret) {
kdc_log(context, config, 0,
"Verify PAC failed for %s (%s) from %s with %s",
spn, cpn, from, krb5_get_err_text(context, ret));
goto out;
}
}
/* also check the krbtgt for signature */
ret = check_KRB5SignedPath(context,
config,
krbtgt,
tgt,
&spp,
require_signedpath);
if (ret) {
kdc_log(context, config, 0,
"KRB5SignedPath check failed for %s (%s) from %s with %s",
spn, cpn, from, krb5_get_err_text(context, ret));
goto out;
}
/*
*
*/
ret = tgs_make_reply(context,
config,
b,
client_principal,
tgt,
ekey,
&sessionkey,
kvno,
auth_data,
server,
spn,
client,
cp,
krbtgt,
krbtgt_etype,
spp,
&rspac,
e_text,
reply);
out:
free(spn);
free(cpn);
krb5_data_free(&rspac);
krb5_free_keyblock_contents(context, &sessionkey);
if(server)
_kdc_free_ent(context, server);
if(client)
_kdc_free_ent(context, client);
if (client_principal && client_principal != cp)
krb5_free_principal(context, client_principal);
if (cp)
krb5_free_principal(context, cp);
if (sp)
krb5_free_principal(context, sp);
free_EncTicketPart(&adtkt);
return ret;
}
static krb5_error_code
tgs_parse_request(krb5_context context,
krb5_kdc_configuration *config,
KDC_REQ_BODY *b,
const PA_DATA *tgs_req,
hdb_entry_ex **krbtgt,
krb5_enctype *krbtgt_etype,
krb5_ticket **ticket,
const char **e_text,
const char *from,
const struct sockaddr *from_addr,
time_t **csec,
int **cusec,
AuthorizationData **auth_data)
{
krb5_ap_req ap_req;
krb5_error_code ret;
krb5_principal princ;
krb5_auth_context ac = NULL;
krb5_flags ap_req_options;
krb5_flags verify_ap_req_flags;
krb5_crypto crypto;
Key *tkey;
*auth_data = NULL;
*csec = NULL;
*cusec = NULL;
memset(&ap_req, 0, sizeof(ap_req));
ret = krb5_decode_ap_req(context, &tgs_req->padata_value, &ap_req);
if(ret){
kdc_log(context, config, 0, "Failed to decode AP-REQ: %s",
krb5_get_err_text(context, ret));
goto out;
}
if(!get_krbtgt_realm(&ap_req.ticket.sname)){
/* XXX check for ticket.sname == req.sname */
kdc_log(context, config, 0, "PA-DATA is not a ticket-granting ticket");
ret = KRB5KDC_ERR_POLICY; /* ? */
goto out;
}
_krb5_principalname2krb5_principal(context,
&princ,
ap_req.ticket.sname,
ap_req.ticket.realm);
ret = _kdc_db_fetch(context, config, princ, HDB_F_GET_KRBTGT, NULL, krbtgt);
if(ret) {
char *p;
ret = krb5_unparse_name(context, princ, &p);
if (ret != 0)
p = "<unparse_name failed>";
krb5_free_principal(context, princ);
kdc_log(context, config, 0,
"Ticket-granting ticket not found in database: %s: %s",
p, krb5_get_err_text(context, ret));
if (ret == 0)
free(p);
ret = KRB5KRB_AP_ERR_NOT_US;
goto out;
}
if(ap_req.ticket.enc_part.kvno &&
*ap_req.ticket.enc_part.kvno != (*krbtgt)->entry.kvno){
char *p;
ret = krb5_unparse_name (context, princ, &p);
krb5_free_principal(context, princ);
if (ret != 0)
p = "<unparse_name failed>";
kdc_log(context, config, 0,
"Ticket kvno = %d, DB kvno = %d (%s)",
*ap_req.ticket.enc_part.kvno,
(*krbtgt)->entry.kvno,
p);
if (ret == 0)
free (p);
ret = KRB5KRB_AP_ERR_BADKEYVER;
goto out;
}
*krbtgt_etype = ap_req.ticket.enc_part.etype;
ret = hdb_enctype2key(context, &(*krbtgt)->entry,
ap_req.ticket.enc_part.etype, &tkey);
if(ret){
char *str, *p;
krb5_enctype_to_string(context, ap_req.ticket.enc_part.etype, &str);
krb5_unparse_name(context, princ, &p);
kdc_log(context, config, 0,
"No server key with enctype %s found for %s", str, p);
free(str);
free(p);
ret = KRB5KRB_AP_ERR_BADKEYVER;
goto out;
}
if (b->kdc_options.validate)
verify_ap_req_flags = KRB5_VERIFY_AP_REQ_IGNORE_INVALID;
else
verify_ap_req_flags = 0;
ret = krb5_verify_ap_req2(context,
&ac,
&ap_req,
princ,
&tkey->key,
verify_ap_req_flags,
&ap_req_options,
ticket,
KRB5_KU_TGS_REQ_AUTH);
krb5_free_principal(context, princ);
if(ret) {
kdc_log(context, config, 0, "Failed to verify AP-REQ: %s",
krb5_get_err_text(context, ret));
goto out;
}
{
krb5_authenticator auth;
ret = krb5_auth_con_getauthenticator(context, ac, &auth);
if (ret == 0) {
*csec = malloc(sizeof(**csec));
if (*csec == NULL) {
krb5_free_authenticator(context, &auth);
kdc_log(context, config, 0, "malloc failed");
goto out;
}
**csec = auth->ctime;
*cusec = malloc(sizeof(**cusec));
if (*cusec == NULL) {
krb5_free_authenticator(context, &auth);
kdc_log(context, config, 0, "malloc failed");
goto out;
}
**cusec = auth->cusec;
krb5_free_authenticator(context, &auth);
}
}
ret = tgs_check_authenticator(context, config,
ac, b, e_text, &(*ticket)->ticket.key);
if (ret) {
krb5_auth_con_free(context, ac);
goto out;
}
if (b->enc_authorization_data) {
krb5_keyblock *subkey;
krb5_data ad;
ret = krb5_auth_con_getremotesubkey(context,
ac,
&subkey);
if(ret){
krb5_auth_con_free(context, ac);
kdc_log(context, config, 0, "Failed to get remote subkey: %s",
krb5_get_err_text(context, ret));
goto out;
}
if(subkey == NULL){
ret = krb5_auth_con_getkey(context, ac, &subkey);
if(ret) {
krb5_auth_con_free(context, ac);
kdc_log(context, config, 0, "Failed to get session key: %s",
krb5_get_err_text(context, ret));
goto out;
}
}
if(subkey == NULL){
krb5_auth_con_free(context, ac);
kdc_log(context, config, 0,
"Failed to get key for enc-authorization-data");
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
goto out;
}
ret = krb5_crypto_init(context, subkey, 0, &crypto);
if (ret) {
krb5_auth_con_free(context, ac);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
krb5_get_err_text(context, ret));
goto out;
}
ret = krb5_decrypt_EncryptedData (context,
crypto,
KRB5_KU_TGS_REQ_AUTH_DAT_SUBKEY,
b->enc_authorization_data,
&ad);
krb5_crypto_destroy(context, crypto);
if(ret){
krb5_auth_con_free(context, ac);
kdc_log(context, config, 0,
"Failed to decrypt enc-authorization-data");
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
goto out;
}
krb5_free_keyblock(context, subkey);
ALLOC(*auth_data);
if (*auth_data == NULL) {
krb5_auth_con_free(context, ac);
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
goto out;
}
ret = decode_AuthorizationData(ad.data, ad.length, *auth_data, NULL);
if(ret){
krb5_auth_con_free(context, ac);
free(*auth_data);
*auth_data = NULL;
kdc_log(context, config, 0, "Failed to decode authorization data");
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY; /* ? */
goto out;
}
}
krb5_auth_con_free(context, ac);
out:
free_AP_REQ(&ap_req);
return ret;
}
krb5_error_code
kdc_check_flags(krb5_context context,
krb5_kdc_configuration *config,
hdb_entry_ex *client_ex, const char *client_name,
hdb_entry_ex *server_ex, const char *server_name,
krb5_boolean is_as_req)
{
if(client_ex != NULL) {
hdb_entry *client = &client_ex->entry;
/* check client */
if (client->flags.locked_out) {
kdc_log(context, config, 0,
"Client (%s) is locked out", client_name);
return KRB5KDC_ERR_CLIENT_REVOKED;
}
if (client->flags.invalid) {
kdc_log(context, config, 0,
"Client (%s) has invalid bit set", client_name);
return KRB5KDC_ERR_POLICY;
}
if(!client->flags.client){
kdc_log(context, config, 0,
"Principal may not act as client -- %s", client_name);
return KRB5KDC_ERR_POLICY;
}
if (client->valid_start && *client->valid_start > kdc_time) {
char starttime_str[100];
krb5_format_time(context, *client->valid_start,
starttime_str, sizeof(starttime_str), TRUE);
kdc_log(context, config, 0,
"Client not yet valid until %s -- %s",
starttime_str, client_name);
return KRB5KDC_ERR_CLIENT_NOTYET;
}
if (client->valid_end && *client->valid_end < kdc_time) {
char endtime_str[100];
krb5_format_time(context, *client->valid_end,
endtime_str, sizeof(endtime_str), TRUE);
kdc_log(context, config, 0,
"Client expired at %s -- %s",
endtime_str, client_name);
return KRB5KDC_ERR_NAME_EXP;
}
if (client->pw_end && *client->pw_end < kdc_time
&& (server_ex == NULL || !server_ex->entry.flags.change_pw)) {
char pwend_str[100];
krb5_format_time(context, *client->pw_end,
pwend_str, sizeof(pwend_str), TRUE);
kdc_log(context, config, 0,
"Client's key has expired at %s -- %s",
pwend_str, client_name);
return KRB5KDC_ERR_KEY_EXPIRED;
}
}
/* check server */
if (server_ex != NULL) {
hdb_entry *server = &server_ex->entry;
if (server->flags.locked_out) {
kdc_log(context, config, 0,
"Client server locked out -- %s", server_name);
return KRB5KDC_ERR_POLICY;
}
if (server->flags.invalid) {
kdc_log(context, config, 0,
"Server has invalid flag set -- %s", server_name);
return KRB5KDC_ERR_POLICY;
}
if(!server->flags.server){
kdc_log(context, config, 0,
"Principal may not act as server -- %s", server_name);
return KRB5KDC_ERR_POLICY;
}
if(!is_as_req && server->flags.initial) {
kdc_log(context, config, 0,
"AS-REQ is required for server -- %s", server_name);
return KRB5KDC_ERR_POLICY;
}
if (server->valid_start && *server->valid_start > kdc_time) {
char starttime_str[100];
krb5_format_time(context, *server->valid_start,
starttime_str, sizeof(starttime_str), TRUE);
kdc_log(context, config, 0,
"Server not yet valid until %s -- %s",
starttime_str, server_name);
return KRB5KDC_ERR_SERVICE_NOTYET;
}
if (server->valid_end && *server->valid_end < kdc_time) {
char endtime_str[100];
krb5_format_time(context, *server->valid_end,
endtime_str, sizeof(endtime_str), TRUE);
kdc_log(context, config, 0,
"Server expired at %s -- %s",
endtime_str, server_name);
return KRB5KDC_ERR_SERVICE_EXP;
}
if (server->pw_end && *server->pw_end < kdc_time) {
char pwend_str[100];
krb5_format_time(context, *server->pw_end,
pwend_str, sizeof(pwend_str), TRUE);
kdc_log(context, config, 0,
"Server's key has expired at -- %s",
pwend_str, server_name);
return KRB5KDC_ERR_KEY_EXPIRED;
}
}
return 0;
}
krb5_error_code
_kdc_as_rep(krb5_context context,
krb5_kdc_configuration *config,
KDC_REQ *req,
const krb5_data *req_buffer,
krb5_data *reply,
const char *from,
struct sockaddr *from_addr,
int datagram_reply)
{
KDC_REQ_BODY *b = &req->req_body;
AS_REP rep;
KDCOptions f = b->kdc_options;
hdb_entry_ex *client = NULL, *server = NULL;
HDB *clientdb;
krb5_enctype setype, sessionetype;
krb5_data e_data;
EncTicketPart et;
EncKDCRepPart ek;
krb5_principal client_princ = NULL, server_princ = NULL;
char *client_name = NULL, *server_name = NULL;
krb5_error_code ret = 0;
const char *e_text = NULL;
krb5_crypto crypto;
Key *ckey, *skey;
EncryptionKey *reply_key = NULL, session_key;
int flags = HDB_F_FOR_AS_REQ;
#ifdef PKINIT
pk_client_params *pkp = NULL;
#endif
memset(&rep, 0, sizeof(rep));
memset(&session_key, 0, sizeof(session_key));
krb5_data_zero(&e_data);
ALLOC(rep.padata);
rep.padata->len = 0;
rep.padata->val = NULL;
if (f.canonicalize)
flags |= HDB_F_CANON;
if(b->sname == NULL){
ret = KRB5KRB_ERR_GENERIC;
e_text = "No server in request";
} else{
ret = _krb5_principalname2krb5_principal (context,
&server_princ,
*(b->sname),
b->realm);
if (ret == 0)
ret = krb5_unparse_name(context, server_princ, &server_name);
}
if (ret) {
kdc_log(context, config, 0,
"AS-REQ malformed server name from %s", from);
goto out;
}
if(b->cname == NULL){
ret = KRB5KRB_ERR_GENERIC;
e_text = "No client in request";
} else {
ret = _krb5_principalname2krb5_principal (context,
&client_princ,
*(b->cname),
b->realm);
if (ret)
goto out;
ret = krb5_unparse_name(context, client_princ, &client_name);
}
if (ret) {
kdc_log(context, config, 0,
"AS-REQ malformed client name from %s", from);
goto out;
}
kdc_log(context, config, 0, "AS-REQ %s from %s for %s",
client_name, from, server_name);
/*
*
*/
if (_kdc_is_anonymous(context, client_princ)) {
if (!b->kdc_options.request_anonymous) {
kdc_log(context, config, 0, "Anonymous ticket w/o anonymous flag");
ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto out;
}
} else if (b->kdc_options.request_anonymous) {
kdc_log(context, config, 0,
"Request for a anonymous ticket with non "
"anonymous client name: %s", client_name);
ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto out;
}
/*
*
*/
ret = _kdc_db_fetch(context, config, client_princ,
HDB_F_GET_CLIENT | flags, NULL,
&clientdb, &client);
if(ret == HDB_ERR_NOT_FOUND_HERE) {
kdc_log(context, config, 5, "client %s does not have secrets at this KDC, need to proxy", client_name);
goto out;
} else if(ret){
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "UNKNOWN -- %s: %s", client_name, msg);
krb5_free_error_message(context, msg);
ret = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto out;
}
ret = _kdc_db_fetch(context, config, server_princ,
HDB_F_GET_SERVER|HDB_F_GET_KRBTGT | flags,
NULL, NULL, &server);
if(ret == HDB_ERR_NOT_FOUND_HERE) {
kdc_log(context, config, 5, "target %s does not have secrets at this KDC, need to proxy", server_name);
goto out;
} else if(ret){
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "UNKNOWN -- %s: %s", server_name, msg);
krb5_free_error_message(context, msg);
ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto out;
}
memset(&et, 0, sizeof(et));
memset(&ek, 0, sizeof(ek));
/*
* Select a session enctype from the list of the crypto system
* supported enctypes that is supported by the client and is one of
* the enctype of the enctype of the service (likely krbtgt).
*
* The latter is used as a hint of what enctypes all KDC support,
* to make sure a newer version of KDC won't generate a session
* enctype that an older version of a KDC in the same realm can't
* decrypt.
*/
ret = _kdc_find_etype(context, config->as_use_strongest_session_key, FALSE,
client, b->etype.val, b->etype.len, &sessionetype,
NULL);
if (ret) {
kdc_log(context, config, 0,
"Client (%s) from %s has no common enctypes with KDC "
"to use for the session key",
client_name, from);
goto out;
}
/*
* But if the KDC admin is paranoid and doesn't want to have "not
* the best" enctypes on the krbtgt, lets save the best pick from
* the client list and hope that that will work for any other
* KDCs.
*/
/*
* Pre-auth processing
*/
if(req->padata){
int i;
const PA_DATA *pa;
int found_pa = 0;
log_patypes(context, config, req->padata);
#ifdef PKINIT
kdc_log(context, config, 5,
"Looking for PKINIT pa-data -- %s", client_name);
e_text = "No PKINIT PA found";
i = 0;
pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ);
if (pa == NULL) {
i = 0;
pa = _kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_REQ_WIN);
}
if (pa) {
char *client_cert = NULL;
ret = _kdc_pk_rd_padata(context, config, req, pa, client, &pkp);
if (ret) {
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
kdc_log(context, config, 5,
"Failed to decode PKINIT PA-DATA -- %s",
client_name);
goto ts_enc;
}
if (ret == 0 && pkp == NULL)
goto ts_enc;
ret = _kdc_pk_check_client(context,
config,
clientdb,
client,
pkp,
&client_cert);
if (ret) {
e_text = "PKINIT certificate not allowed to "
"impersonate principal";
_kdc_pk_free_client_param(context, pkp);
kdc_log(context, config, 0, "%s", e_text);
pkp = NULL;
goto out;
}
found_pa = 1;
et.flags.pre_authent = 1;
kdc_log(context, config, 0,
"PKINIT pre-authentication succeeded -- %s using %s",
client_name, client_cert);
free(client_cert);
if (pkp)
goto preauth_done;
}
ts_enc:
#endif
if (client->entry.flags.locked_out) {
ret = KRB5KDC_ERR_CLIENT_REVOKED;
kdc_log(context, config, 0,
"Client (%s) is locked out", client_name);
goto out;
}
kdc_log(context, config, 5, "Looking for ENC-TS pa-data -- %s",
client_name);
i = 0;
e_text = "No ENC-TS found";
while((pa = _kdc_find_padata(req, &i, KRB5_PADATA_ENC_TIMESTAMP))){
krb5_data ts_data;
PA_ENC_TS_ENC p;
size_t len;
EncryptedData enc_data;
Key *pa_key;
char *str;
found_pa = 1;
if (b->kdc_options.request_anonymous) {
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
kdc_log(context, config, 0, "ENC-TS doesn't support anon");
goto out;
}
ret = decode_EncryptedData(pa->padata_value.data,
pa->padata_value.length,
&enc_data,
&len);
if (ret) {
ret = KRB5KRB_AP_ERR_BAD_INTEGRITY;
kdc_log(context, config, 5, "Failed to decode PA-DATA -- %s",
client_name);
goto out;
}
ret = hdb_enctype2key(context, &client->entry,
enc_data.etype, &pa_key);
if(ret){
char *estr;
e_text = "No key matches pa-data";
ret = KRB5KDC_ERR_ETYPE_NOSUPP;
if(krb5_enctype_to_string(context, enc_data.etype, &estr))
estr = NULL;
if(estr == NULL)
kdc_log(context, config, 5,
"No client key matching pa-data (%d) -- %s",
enc_data.etype, client_name);
else
kdc_log(context, config, 5,
"No client key matching pa-data (%s) -- %s",
estr, client_name);
free(estr);
free_EncryptedData(&enc_data);
continue;
}
try_next_key:
ret = krb5_crypto_init(context, &pa_key->key, 0, &crypto);
if (ret) {
const char *msg = krb5_get_error_message(context, ret);
kdc_log(context, config, 0, "krb5_crypto_init failed: %s", msg);
krb5_free_error_message(context, msg);
free_EncryptedData(&enc_data);
continue;
}
ret = krb5_decrypt_EncryptedData (context,
crypto,
KRB5_KU_PA_ENC_TIMESTAMP,
&enc_data,
&ts_data);
krb5_crypto_destroy(context, crypto);
/*
* Since the user might have several keys with the same
* enctype but with diffrent salting, we need to try all
* the keys with the same enctype.
*/
if(ret){
krb5_error_code ret2;
const char *msg = krb5_get_error_message(context, ret);
ret2 = krb5_enctype_to_string(context,
pa_key->key.keytype, &str);
if (ret2)
str = NULL;
kdc_log(context, config, 5,
"Failed to decrypt PA-DATA -- %s "
"(enctype %s) error %s",
client_name, str ? str : "unknown enctype", msg);
krb5_free_error_message(context, msg);
free(str);
if(hdb_next_enctype2key(context, &client->entry,
enc_data.etype, &pa_key) == 0)
goto try_next_key;
e_text = "Failed to decrypt PA-DATA";
free_EncryptedData(&enc_data);
if (clientdb->hdb_auth_status)
(clientdb->hdb_auth_status)(context, clientdb, client, HDB_AUTH_WRONG_PASSWORD);
ret = KRB5KDC_ERR_PREAUTH_FAILED;
continue;
}
free_EncryptedData(&enc_data);
ret = decode_PA_ENC_TS_ENC(ts_data.data,
ts_data.length,
&p,
&len);
krb5_data_free(&ts_data);
if(ret){
e_text = "Failed to decode PA-ENC-TS-ENC";
ret = KRB5KDC_ERR_PREAUTH_FAILED;
kdc_log(context, config,
5, "Failed to decode PA-ENC-TS_ENC -- %s",
client_name);
continue;
}
free_PA_ENC_TS_ENC(&p);
if (abs(kdc_time - p.patimestamp) > context->max_skew) {
char client_time[100];
krb5_format_time(context, p.patimestamp,
client_time, sizeof(client_time), TRUE);
ret = KRB5KRB_AP_ERR_SKEW;
kdc_log(context, config, 0,
"Too large time skew, "
"client time %s is out by %u > %u seconds -- %s",
client_time,
(unsigned)abs(kdc_time - p.patimestamp),
context->max_skew,
client_name);
/*
* The following is needed to make windows clients to
* retry using the timestamp in the error message, if
* there is a e_text, they become unhappy.
*/
e_text = NULL;
goto out;
}
et.flags.pre_authent = 1;
set_salt_padata(rep.padata, pa_key->salt);
reply_key = &pa_key->key;
ret = krb5_enctype_to_string(context, pa_key->key.keytype, &str);
if (ret)
str = NULL;
kdc_log(context, config, 2,
"ENC-TS Pre-authentication succeeded -- %s using %s",
client_name, str ? str : "unknown enctype");
free(str);
break;
}
#ifdef PKINIT
preauth_done:
#endif
if(found_pa == 0 && config->require_preauth)
goto use_pa;
/* We come here if we found a pa-enc-timestamp, but if there
was some problem with it, other than too large skew */
if(found_pa && et.flags.pre_authent == 0){
kdc_log(context, config, 0, "%s -- %s", e_text, client_name);
e_text = NULL;
goto out;
}
}else if (config->require_preauth
|| b->kdc_options.request_anonymous /* hack to force anon */
|| client->entry.flags.require_preauth
|| server->entry.flags.require_preauth) {
METHOD_DATA method_data;
PA_DATA *pa;
unsigned char *buf;
size_t len;
use_pa:
method_data.len = 0;
method_data.val = NULL;
ret = realloc_method_data(&method_data);
if (ret) {
free_METHOD_DATA(&method_data);
goto out;
}
pa = &method_data.val[method_data.len-1];
pa->padata_type = KRB5_PADATA_ENC_TIMESTAMP;
pa->padata_value.length = 0;
pa->padata_value.data = NULL;
#ifdef PKINIT
ret = realloc_method_data(&method_data);
if (ret) {
free_METHOD_DATA(&method_data);
goto out;
}
pa = &method_data.val[method_data.len-1];
pa->padata_type = KRB5_PADATA_PK_AS_REQ;
pa->padata_value.length = 0;
pa->padata_value.data = NULL;
ret = realloc_method_data(&method_data);
if (ret) {
free_METHOD_DATA(&method_data);
goto out;
}
pa = &method_data.val[method_data.len-1];
pa->padata_type = KRB5_PADATA_PK_AS_REQ_WIN;
pa->padata_value.length = 0;
pa->padata_value.data = NULL;
#endif
/*
* If there is a client key, send ETYPE_INFO{,2}
*/
ret = _kdc_find_etype(context,
config->preauth_use_strongest_session_key, TRUE,
client, b->etype.val, b->etype.len, NULL, &ckey);
if (ret == 0) {
/*
* RFC4120 requires:
* - If the client only knows about old enctypes, then send
* both info replies (we send 'info' first in the list).
* - If the client is 'modern', because it knows about 'new'
* enctype types, then only send the 'info2' reply.
*
* Before we send the full list of etype-info data, we pick
* the client key we would have used anyway below, just pick
* that instead.
*/
if (older_enctype(ckey->key.keytype)) {
ret = get_pa_etype_info(context, config,
&method_data, ckey);
if (ret) {
free_METHOD_DATA(&method_data);
goto out;
}
}
ret = get_pa_etype_info2(context, config,
&method_data, ckey);
if (ret) {
free_METHOD_DATA(&method_data);
goto out;
}
}
ASN1_MALLOC_ENCODE(METHOD_DATA, buf, len, &method_data, &len, ret);
free_METHOD_DATA(&method_data);
e_data.data = buf;
e_data.length = len;
e_text ="Need to use PA-ENC-TIMESTAMP/PA-PK-AS-REQ",
ret = KRB5KDC_ERR_PREAUTH_REQUIRED;
kdc_log(context, config, 0,
"No preauth found, returning PREAUTH-REQUIRED -- %s",
client_name);
goto out;
}
/*
* Verify flags after the user been required to prove its identity
* with in a preauth mech.
*/
ret = _kdc_check_access(context, config, client, client_name,
server, server_name,
req, &e_data);
if(ret)
goto out;
if (clientdb->hdb_auth_status)
(clientdb->hdb_auth_status)(context, clientdb, client,
HDB_AUTH_SUCCESS);
/*
* Selelct the best encryption type for the KDC with out regard to
* the client since the client never needs to read that data.
*/
ret = _kdc_get_preferred_key(context, config,
server, server_name,
&setype, &skey);
if(ret)
goto out;
if(f.renew || f.validate || f.proxy || f.forwarded || f.enc_tkt_in_skey
|| (f.request_anonymous && !config->allow_anonymous)) {
ret = KRB5KDC_ERR_BADOPTION;
e_text = "Bad KDC options";
kdc_log(context, config, 0, "Bad KDC options -- %s", client_name);
goto out;
}
rep.pvno = 5;
rep.msg_type = krb_as_rep;
ret = copy_Realm(&client->entry.principal->realm, &rep.crealm);
if (ret)
goto out;
ret = _krb5_principal2principalname(&rep.cname, client->entry.principal);
if (ret)
goto out;
rep.ticket.tkt_vno = 5;
copy_Realm(&server->entry.principal->realm, &rep.ticket.realm);
_krb5_principal2principalname(&rep.ticket.sname,
server->entry.principal);
/* java 1.6 expects the name to be the same type, lets allow that
* uncomplicated name-types. */
#define CNT(sp,t) (((sp)->sname->name_type) == KRB5_NT_##t)
if (CNT(b, UNKNOWN) || CNT(b, PRINCIPAL) || CNT(b, SRV_INST) || CNT(b, SRV_HST) || CNT(b, SRV_XHST))
rep.ticket.sname.name_type = b->sname->name_type;
#undef CNT
et.flags.initial = 1;
if(client->entry.flags.forwardable && server->entry.flags.forwardable)
et.flags.forwardable = f.forwardable;
else if (f.forwardable) {
e_text = "Ticket may not be forwardable";
ret = KRB5KDC_ERR_POLICY;
kdc_log(context, config, 0,
"Ticket may not be forwardable -- %s", client_name);
goto out;
}
if(client->entry.flags.proxiable && server->entry.flags.proxiable)
et.flags.proxiable = f.proxiable;
else if (f.proxiable) {
e_text = "Ticket may not be proxiable";
ret = KRB5KDC_ERR_POLICY;
kdc_log(context, config, 0,
"Ticket may not be proxiable -- %s", client_name);
goto out;
}
if(client->entry.flags.postdate && server->entry.flags.postdate)
et.flags.may_postdate = f.allow_postdate;
else if (f.allow_postdate){
e_text = "Ticket may not be postdate";
ret = KRB5KDC_ERR_POLICY;
kdc_log(context, config, 0,
"Ticket may not be postdatable -- %s", client_name);
goto out;
}
/* check for valid set of addresses */
if(!_kdc_check_addresses(context, config, b->addresses, from_addr)) {
e_text = "Bad address list in requested";
ret = KRB5KRB_AP_ERR_BADADDR;
kdc_log(context, config, 0,
"Bad address list requested -- %s", client_name);
goto out;
}
ret = copy_PrincipalName(&rep.cname, &et.cname);
if (ret)
goto out;
ret = copy_Realm(&rep.crealm, &et.crealm);
if (ret)
goto out;
{
time_t start;
time_t t;
start = et.authtime = kdc_time;
if(f.postdated && req->req_body.from){
ALLOC(et.starttime);
start = *et.starttime = *req->req_body.from;
et.flags.invalid = 1;
et.flags.postdated = 1; /* XXX ??? */
}
_kdc_fix_time(&b->till);
t = *b->till;
/* be careful not overflowing */
if(client->entry.max_life)
t = start + min(t - start, *client->entry.max_life);
if(server->entry.max_life)
t = start + min(t - start, *server->entry.max_life);
#if 0
t = min(t, start + realm->max_life);
#endif
et.endtime = t;
if(f.renewable_ok && et.endtime < *b->till){
f.renewable = 1;
if(b->rtime == NULL){
ALLOC(b->rtime);
*b->rtime = 0;
}
if(*b->rtime < *b->till)
*b->rtime = *b->till;
}
if(f.renewable && b->rtime){
t = *b->rtime;
if(t == 0)
t = MAX_TIME;
if(client->entry.max_renew)
t = start + min(t - start, *client->entry.max_renew);
if(server->entry.max_renew)
t = start + min(t - start, *server->entry.max_renew);
#if 0
t = min(t, start + realm->max_renew);
#endif
ALLOC(et.renew_till);
*et.renew_till = t;
et.flags.renewable = 1;
}
}
if (f.request_anonymous)
et.flags.anonymous = 1;
if(b->addresses){
ALLOC(et.caddr);
copy_HostAddresses(b->addresses, et.caddr);
}
et.transited.tr_type = DOMAIN_X500_COMPRESS;
krb5_data_zero(&et.transited.contents);
/* The MIT ASN.1 library (obviously) doesn't tell lengths encoded
* as 0 and as 0x80 (meaning indefinite length) apart, and is thus
* incapable of correctly decoding SEQUENCE OF's of zero length.
*
* To fix this, always send at least one no-op last_req
*
* If there's a pw_end or valid_end we will use that,
* otherwise just a dummy lr.
*/
ek.last_req.val = malloc(2 * sizeof(*ek.last_req.val));
if (ek.last_req.val == NULL) {
ret = ENOMEM;
goto out;
}
ek.last_req.len = 0;
if (client->entry.pw_end
&& (config->kdc_warn_pwexpire == 0
|| kdc_time + config->kdc_warn_pwexpire >= *client->entry.pw_end)) {
ek.last_req.val[ek.last_req.len].lr_type = LR_PW_EXPTIME;
ek.last_req.val[ek.last_req.len].lr_value = *client->entry.pw_end;
++ek.last_req.len;
}
if (client->entry.valid_end) {
ek.last_req.val[ek.last_req.len].lr_type = LR_ACCT_EXPTIME;
ek.last_req.val[ek.last_req.len].lr_value = *client->entry.valid_end;
++ek.last_req.len;
}
if (ek.last_req.len == 0) {
ek.last_req.val[ek.last_req.len].lr_type = LR_NONE;
ek.last_req.val[ek.last_req.len].lr_value = 0;
++ek.last_req.len;
}
ek.nonce = b->nonce;
if (client->entry.valid_end || client->entry.pw_end) {
ALLOC(ek.key_expiration);
if (client->entry.valid_end) {
if (client->entry.pw_end)
*ek.key_expiration = min(*client->entry.valid_end,
*client->entry.pw_end);
else
*ek.key_expiration = *client->entry.valid_end;
} else
*ek.key_expiration = *client->entry.pw_end;
} else
ek.key_expiration = NULL;
ek.flags = et.flags;
ek.authtime = et.authtime;
if (et.starttime) {
ALLOC(ek.starttime);
*ek.starttime = *et.starttime;
}
ek.endtime = et.endtime;
if (et.renew_till) {
ALLOC(ek.renew_till);
*ek.renew_till = *et.renew_till;
}
copy_Realm(&rep.ticket.realm, &ek.srealm);
copy_PrincipalName(&rep.ticket.sname, &ek.sname);
if(et.caddr){
ALLOC(ek.caddr);
copy_HostAddresses(et.caddr, ek.caddr);
}
#if PKINIT
if (pkp) {
e_text = "Failed to build PK-INIT reply";
ret = _kdc_pk_mk_pa_reply(context, config, pkp, client,
sessionetype, req, req_buffer,
&reply_key, &et.key, rep.padata);
if (ret)
goto out;
ret = _kdc_add_inital_verified_cas(context,
config,
pkp,
&et);
if (ret)
goto out;
} else
#endif
{
ret = krb5_generate_random_keyblock(context, sessionetype, &et.key);
if (ret)
goto out;
}
if (reply_key == NULL) {
e_text = "Client have no reply key";
ret = KRB5KDC_ERR_CLIENT_NOTYET;
goto out;
}
ret = copy_EncryptionKey(&et.key, &ek.key);
if (ret)
goto out;
if (rep.padata->len == 0) {
free(rep.padata);
rep.padata = NULL;
}
/* Add the PAC */
if (send_pac_p(context, req)) {
krb5_pac p = NULL;
krb5_data data;
ret = _kdc_pac_generate(context, client, &p);
if (ret) {
kdc_log(context, config, 0, "PAC generation failed for -- %s",
client_name);
goto out;
}
if (p != NULL) {
ret = _krb5_pac_sign(context, p, et.authtime,
client->entry.principal,
&skey->key, /* Server key */
&skey->key, /* FIXME: should be krbtgt key */
&data);
krb5_pac_free(context, p);
if (ret) {
kdc_log(context, config, 0, "PAC signing failed for -- %s",
client_name);
goto out;
}
ret = _kdc_tkt_add_if_relevant_ad(context, &et,
KRB5_AUTHDATA_WIN2K_PAC,
&data);
krb5_data_free(&data);
if (ret)
goto out;
}
}
_kdc_log_timestamp(context, config, "AS-REQ", et.authtime, et.starttime,
et.endtime, et.renew_till);
/* do this as the last thing since this signs the EncTicketPart */
ret = _kdc_add_KRB5SignedPath(context,
config,
server,
setype,
client->entry.principal,
NULL,
NULL,
&et);
if (ret)
goto out;
log_as_req(context, config, reply_key->keytype, setype, b);
ret = _kdc_encode_reply(context, config,
&rep, &et, &ek, setype, server->entry.kvno,
&skey->key, client->entry.kvno,
reply_key, 0, &e_text, reply);
free_EncTicketPart(&et);
free_EncKDCRepPart(&ek);
if (ret)
goto out;
/* */
if (datagram_reply && reply->length > config->max_datagram_reply_length) {
krb5_data_free(reply);
ret = KRB5KRB_ERR_RESPONSE_TOO_BIG;
e_text = "Reply packet too large";
}
out:
free_AS_REP(&rep);
if(ret != 0 && ret != HDB_ERR_NOT_FOUND_HERE){
krb5_mk_error(context,
ret,
e_text,
(e_data.data ? &e_data : NULL),
client_princ,
server_princ,
NULL,
NULL,
reply);
ret = 0;
}
#ifdef PKINIT
if (pkp)
_kdc_pk_free_client_param(context, pkp);
#endif
if (e_data.data)
free(e_data.data);
if (client_princ)
krb5_free_principal(context, client_princ);
free(client_name);
if (server_princ)
krb5_free_principal(context, server_princ);
free(server_name);
if(client)
_kdc_free_ent(context, client);
if(server)
_kdc_free_ent(context, server);
return ret;
}
static void
terminated(void *ctx)
{
kdc_log(context, config, 0, "Terminated: %s", (char *)ctx);
exit(1);
}