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freebsd-dev/crypto/heimdal/kdc/pkinit.c
Cy Schubert ed549cb0c5 heimdal: Fix multiple security vulnerabilities 
The following issues are patched:

 - CVE-2022-42898 PAC parse integer overflows
 - CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
 - CVE-2021-44758 NULL dereference DoS in SPNEGO acceptors
 - CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec

    Note that CVE-2022-44640 is a severe vulnerability, possibly a 10.0
    on the Common Vulnerability Scoring System (CVSS) v3, as we believe
    it should be possible to get an RCE on a KDC, which means that
    credentials can be compromised that can be used to impersonate
    anyone in a realm or forest of realms.

    Heimdal's ASN.1 compiler generates code that allows specially
    crafted DER encodings of CHOICEs to invoke the wrong free function
    on the decoded structure upon decode error.  This is known to impact
    the Heimdal KDC, leading to an invalid free() of an address partly
    or wholly under the control of the attacker, in turn leading to a
    potential remote code execution (RCE) vulnerability.

    This error affects the DER codec for all extensible CHOICE types
    used in Heimdal, though not all cases will be exploitable.  We have
    not completed a thorough analysis of all the Heimdal components
    affected, thus the Kerberos client, the X.509 library, and other
    parts, may be affected as well.

    This bug has been in Heimdal's ASN.1 compiler since 2005, but it may
    only affect Heimdal 1.6 and up.  It was first reported by Douglas
    Bagnall, though it had been found independently by the Heimdal
    maintainers via fuzzing a few weeks earlier.

    While no zero-day exploit is known, such an exploit will likely be
    available soon after public disclosure.

 - CVE-2019-14870: Validate client attributes in protocol-transition
 - CVE-2019-14870: Apply forwardable policy in protocol-transition
 - CVE-2019-14870: Always lookup impersonate client in DB

Sponsored by:	so (philip)
Obtained from:	so (philip)
Tested by:	philip, cy
MFC after:	immediately
2022-11-15 13:12:37 -08:00

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/*
* Copyright (c) 2003 - 2008 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Portions Copyright (c) 2009 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kdc_locl.h"
#ifdef PKINIT
#include <heim_asn1.h>
#include <rfc2459_asn1.h>
#include <cms_asn1.h>
#include <pkinit_asn1.h>
#include <hx509.h>
#include "crypto-headers.h"
struct pk_client_params {
enum krb5_pk_type type;
enum { USE_RSA, USE_DH, USE_ECDH } keyex;
union {
struct {
BIGNUM *public_key;
DH *key;
} dh;
#ifdef HAVE_OPENSSL
struct {
EC_KEY *public_key;
EC_KEY *key;
} ecdh;
#endif
} u;
hx509_cert cert;
unsigned nonce;
EncryptionKey reply_key;
char *dh_group_name;
hx509_peer_info peer;
hx509_certs client_anchors;
hx509_verify_ctx verify_ctx;
};
struct pk_principal_mapping {
unsigned int len;
struct pk_allowed_princ {
krb5_principal principal;
char *subject;
} *val;
};
static struct krb5_pk_identity *kdc_identity;
static struct pk_principal_mapping principal_mappings;
static struct krb5_dh_moduli **moduli;
static struct {
krb5_data data;
time_t expire;
time_t next_update;
} ocsp;
/*
*
*/
static krb5_error_code
pk_check_pkauthenticator_win2k(krb5_context context,
PKAuthenticator_Win2k *a,
const KDC_REQ *req)
{
krb5_timestamp now;
krb5_timeofday (context, &now);
/* XXX cusec */
if (a->ctime == 0 || abs(a->ctime - now) > context->max_skew) {
krb5_clear_error_message(context);
return KRB5KRB_AP_ERR_SKEW;
}
return 0;
}
static krb5_error_code
pk_check_pkauthenticator(krb5_context context,
PKAuthenticator *a,
const KDC_REQ *req)
{
u_char *buf = NULL;
size_t buf_size;
krb5_error_code ret;
size_t len = 0;
krb5_timestamp now;
Checksum checksum;
krb5_timeofday (context, &now);
/* XXX cusec */
if (a->ctime == 0 || abs(a->ctime - now) > context->max_skew) {
krb5_clear_error_message(context);
return KRB5KRB_AP_ERR_SKEW;
}
ASN1_MALLOC_ENCODE(KDC_REQ_BODY, buf, buf_size, &req->req_body, &len, ret);
if (ret) {
krb5_clear_error_message(context);
return ret;
}
if (buf_size != len)
krb5_abortx(context, "Internal error in ASN.1 encoder");
ret = krb5_create_checksum(context,
NULL,
0,
CKSUMTYPE_SHA1,
buf,
len,
&checksum);
free(buf);
if (ret) {
krb5_clear_error_message(context);
return ret;
}
if (a->paChecksum == NULL) {
krb5_clear_error_message(context);
ret = KRB5_KDC_ERR_PA_CHECKSUM_MUST_BE_INCLUDED;
goto out;
}
if (der_heim_octet_string_cmp(a->paChecksum, &checksum.checksum) != 0) {
krb5_clear_error_message(context);
ret = KRB5KRB_ERR_GENERIC;
}
out:
free_Checksum(&checksum);
return ret;
}
void
_kdc_pk_free_client_param(krb5_context context, pk_client_params *cp)
{
if (cp == NULL)
return;
if (cp->cert)
hx509_cert_free(cp->cert);
if (cp->verify_ctx)
hx509_verify_destroy_ctx(cp->verify_ctx);
if (cp->keyex == USE_DH) {
if (cp->u.dh.key)
DH_free(cp->u.dh.key);
if (cp->u.dh.public_key)
BN_free(cp->u.dh.public_key);
}
#ifdef HAVE_OPENSSL
if (cp->keyex == USE_ECDH) {
if (cp->u.ecdh.key)
EC_KEY_free(cp->u.ecdh.key);
if (cp->u.ecdh.public_key)
EC_KEY_free(cp->u.ecdh.public_key);
}
#endif
krb5_free_keyblock_contents(context, &cp->reply_key);
if (cp->dh_group_name)
free(cp->dh_group_name);
if (cp->peer)
hx509_peer_info_free(cp->peer);
if (cp->client_anchors)
hx509_certs_free(&cp->client_anchors);
memset(cp, 0, sizeof(*cp));
free(cp);
}
static krb5_error_code
generate_dh_keyblock(krb5_context context,
pk_client_params *client_params,
krb5_enctype enctype)
{
unsigned char *dh_gen_key = NULL;
krb5_keyblock key;
krb5_error_code ret;
size_t dh_gen_keylen, size;
memset(&key, 0, sizeof(key));
if (client_params->keyex == USE_DH) {
if (client_params->u.dh.public_key == NULL) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret, "public_key");
goto out;
}
if (!DH_generate_key(client_params->u.dh.key)) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"Can't generate Diffie-Hellman keys");
goto out;
}
size = DH_size(client_params->u.dh.key);
dh_gen_key = malloc(size);
if (dh_gen_key == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, "malloc: out of memory");
goto out;
}
dh_gen_keylen = DH_compute_key(dh_gen_key,client_params->u.dh.public_key, client_params->u.dh.key);
if (dh_gen_keylen == (size_t)-1) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"Can't compute Diffie-Hellman key");
goto out;
}
if (dh_gen_keylen < size) {
size -= dh_gen_keylen;
memmove(dh_gen_key + size, dh_gen_key, dh_gen_keylen);
memset(dh_gen_key, 0, size);
}
#ifdef HAVE_OPENSSL
} else if (client_params->keyex == USE_ECDH) {
if (client_params->u.ecdh.public_key == NULL) {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret, "public_key");
goto out;
}
client_params->u.ecdh.key = EC_KEY_new();
if (client_params->u.ecdh.key == NULL) {
ret = ENOMEM;
goto out;
}
EC_KEY_set_group(client_params->u.ecdh.key,
EC_KEY_get0_group(client_params->u.ecdh.public_key));
if (EC_KEY_generate_key(client_params->u.ecdh.key) != 1) {
ret = ENOMEM;
goto out;
}
size = (EC_GROUP_get_degree(EC_KEY_get0_group(client_params->u.ecdh.key)) + 7) / 8;
dh_gen_key = malloc(size);
if (dh_gen_key == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret,
N_("malloc: out of memory", ""));
goto out;
}
dh_gen_keylen = ECDH_compute_key(dh_gen_key, size,
EC_KEY_get0_public_key(client_params->u.ecdh.public_key),
client_params->u.ecdh.key, NULL);
#endif /* HAVE_OPENSSL */
} else {
ret = KRB5KRB_ERR_GENERIC;
krb5_set_error_message(context, ret,
"Diffie-Hellman not selected keys");
goto out;
}
ret = _krb5_pk_octetstring2key(context,
enctype,
dh_gen_key, dh_gen_keylen,
NULL, NULL,
&client_params->reply_key);
out:
if (dh_gen_key)
free(dh_gen_key);
if (key.keyvalue.data)
krb5_free_keyblock_contents(context, &key);
return ret;
}
static BIGNUM *
integer_to_BN(krb5_context context, const char *field, heim_integer *f)
{
BIGNUM *bn;
bn = BN_bin2bn((const unsigned char *)f->data, f->length, NULL);
if (bn == NULL) {
krb5_set_error_message(context, KRB5_BADMSGTYPE,
"PKINIT: parsing BN failed %s", field);
return NULL;
}
BN_set_negative(bn, f->negative);
return bn;
}
static krb5_error_code
get_dh_param(krb5_context context,
krb5_kdc_configuration *config,
SubjectPublicKeyInfo *dh_key_info,
pk_client_params *client_params)
{
DomainParameters dhparam;
DH *dh = NULL;
BIGNUM *p, *q, *g;
krb5_error_code ret;
memset(&dhparam, 0, sizeof(dhparam));
if ((dh_key_info->subjectPublicKey.length % 8) != 0) {
ret = KRB5_BADMSGTYPE;
krb5_set_error_message(context, ret,
"PKINIT: subjectPublicKey not aligned "
"to 8 bit boundary");
goto out;
}
if (dh_key_info->algorithm.parameters == NULL) {
krb5_set_error_message(context, KRB5_BADMSGTYPE,
"PKINIT missing algorithm parameter "
"in clientPublicValue");
return KRB5_BADMSGTYPE;
}
ret = decode_DomainParameters(dh_key_info->algorithm.parameters->data,
dh_key_info->algorithm.parameters->length,
&dhparam,
NULL);
if (ret) {
krb5_set_error_message(context, ret, "Can't decode algorithm "
"parameters in clientPublicValue");
goto out;
}
ret = _krb5_dh_group_ok(context, config->pkinit_dh_min_bits,
&dhparam.p, &dhparam.g, &dhparam.q, moduli,
&client_params->dh_group_name);
if (ret) {
/* XXX send back proposal of better group */
goto out;
}
dh = DH_new();
if (dh == NULL) {
ret = ENOMEM;
krb5_set_error_message(context, ret, "Cannot create DH structure");
goto out;
}
ret = KRB5_BADMSGTYPE;
p = integer_to_BN(context, "DH prime", &dhparam.p);
g = integer_to_BN(context, "DH base", &dhparam.g);
q = integer_to_BN(context, "DH p-1 factor", &dhparam.q);
if (p == NULL || g == NULL || q == NULL) {
BN_free(p);
BN_free(g);
BN_free(q);
goto out;
}
if (DH_set0_pqg(dh, p, g, q) != 1) {
BN_free(p);
BN_free(g);
BN_free(q);
goto out;
}
{
heim_integer glue;
size_t size;
ret = decode_DHPublicKey(dh_key_info->subjectPublicKey.data,
dh_key_info->subjectPublicKey.length / 8,
&glue,
&size);
if (ret) {
krb5_clear_error_message(context);
return ret;
}
client_params->u.dh.public_key = integer_to_BN(context,
"subjectPublicKey",
&glue);
der_free_heim_integer(&glue);
if (client_params->u.dh.public_key == NULL) {
ret = KRB5_BADMSGTYPE;
goto out;
}
}
client_params->u.dh.key = dh;
dh = NULL;
ret = 0;
out:
if (dh)
DH_free(dh);
free_DomainParameters(&dhparam);
return ret;
}
#ifdef HAVE_OPENSSL
static krb5_error_code
get_ecdh_param(krb5_context context,
krb5_kdc_configuration *config,
SubjectPublicKeyInfo *dh_key_info,
pk_client_params *client_params)
{
ECParameters ecp;
EC_KEY *public = NULL;
krb5_error_code ret;
const unsigned char *p;
size_t len;
int nid;
if (dh_key_info->algorithm.parameters == NULL) {
krb5_set_error_message(context, KRB5_BADMSGTYPE,
"PKINIT missing algorithm parameter "
"in clientPublicValue");
return KRB5_BADMSGTYPE;
}
memset(&ecp, 0, sizeof(ecp));
ret = decode_ECParameters(dh_key_info->algorithm.parameters->data,
dh_key_info->algorithm.parameters->length, &ecp, &len);
if (ret)
goto out;
if (ecp.element != choice_ECParameters_namedCurve) {
ret = KRB5_BADMSGTYPE;
goto out;
}
if (der_heim_oid_cmp(&ecp.u.namedCurve, &asn1_oid_id_ec_group_secp256r1) == 0)
nid = NID_X9_62_prime256v1;
else {
ret = KRB5_BADMSGTYPE;
goto out;
}
/* XXX verify group is ok */
public = EC_KEY_new_by_curve_name(nid);
p = dh_key_info->subjectPublicKey.data;
len = dh_key_info->subjectPublicKey.length / 8;
if (o2i_ECPublicKey(&public, &p, len) == NULL) {
ret = KRB5_BADMSGTYPE;
krb5_set_error_message(context, ret,
"PKINIT failed to decode ECDH key");
goto out;
}
client_params->u.ecdh.public_key = public;
public = NULL;
out:
if (public)
EC_KEY_free(public);
free_ECParameters(&ecp);
return ret;
}
#endif /* HAVE_OPENSSL */
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++) {
ret = hx509_cert_init_data(context->hx509ctx,
pc->val[i].cert.data,
pc->val[i].cert.length,
&cert);
if (ret)
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 (req->req_body.kdc_options.request_anonymous) {
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 (req->req_body.kdc_options.request_anonymous)
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 (req->req_body.kdc_options.request_anonymous &&
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);
#ifdef HAVE_OPENSSL
} else if (der_heim_oid_cmp(&ap.clientPublicValue->algorithm.algorithm, &asn1_oid_id_ecPublicKey) == 0) {
cp->keyex = USE_ECDH;
ret = get_ecdh_param(context, config,
ap.clientPublicValue, cp);
#endif /* HAVE_OPENSSL */
} 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;
}
/*
*
*/
static krb5_error_code
BN_to_integer(krb5_context context, const BIGNUM *bn, heim_integer *integer)
{
integer->length = BN_num_bytes(bn);
integer->data = malloc(integer->length);
if (integer->data == NULL) {
krb5_clear_error_message(context);
return ENOMEM;
}
BN_bn2bin(bn, integer->data);
integer->negative = BN_is_negative(bn);
return 0;
}
static krb5_error_code
pk_mk_pa_reply_enckey(krb5_context context,
krb5_kdc_configuration *config,
pk_client_params *cp,
const KDC_REQ *req,
const krb5_data *req_buffer,
krb5_keyblock *reply_key,
ContentInfo *content_info,
hx509_cert *kdc_cert)
{
const heim_oid *envelopedAlg = NULL, *sdAlg = NULL, *evAlg = NULL;
krb5_error_code ret;
krb5_data buf, signed_data;
size_t size = 0;
int do_win2k = 0;
krb5_data_zero(&buf);
krb5_data_zero(&signed_data);
*kdc_cert = NULL;
/*
* If the message client is a win2k-type but it send pa data
* 09-binding it expects a IETF (checksum) reply so there can be
* no replay attacks.
*/
switch (cp->type) {
case PKINIT_WIN2K: {
int i = 0;
if (_kdc_find_padata(req, &i, KRB5_PADATA_PK_AS_09_BINDING) == NULL
&& config->pkinit_require_binding == 0)
{
do_win2k = 1;
}
sdAlg = &asn1_oid_id_pkcs7_data;
evAlg = &asn1_oid_id_pkcs7_data;
envelopedAlg = &asn1_oid_id_rsadsi_des_ede3_cbc;
break;
}
case PKINIT_27:
sdAlg = &asn1_oid_id_pkrkeydata;
evAlg = &asn1_oid_id_pkcs7_signedData;
break;
default:
krb5_abortx(context, "internal pkinit error");
}
if (do_win2k) {
ReplyKeyPack_Win2k kp;
memset(&kp, 0, sizeof(kp));
ret = copy_EncryptionKey(reply_key, &kp.replyKey);
if (ret) {
krb5_clear_error_message(context);
goto out;
}
kp.nonce = cp->nonce;
ASN1_MALLOC_ENCODE(ReplyKeyPack_Win2k,
buf.data, buf.length,
&kp, &size,ret);
free_ReplyKeyPack_Win2k(&kp);
} else {
krb5_crypto ascrypto;
ReplyKeyPack kp;
memset(&kp, 0, sizeof(kp));
ret = copy_EncryptionKey(reply_key, &kp.replyKey);
if (ret) {
krb5_clear_error_message(context);
goto out;
}
ret = krb5_crypto_init(context, reply_key, 0, &ascrypto);
if (ret) {
krb5_clear_error_message(context);
goto out;
}
ret = krb5_create_checksum(context, ascrypto, 6, 0,
req_buffer->data, req_buffer->length,
&kp.asChecksum);
if (ret) {
krb5_clear_error_message(context);
goto out;
}
ret = krb5_crypto_destroy(context, ascrypto);
if (ret) {
krb5_clear_error_message(context);
goto out;
}
ASN1_MALLOC_ENCODE(ReplyKeyPack, buf.data, buf.length, &kp, &size,ret);
free_ReplyKeyPack(&kp);
}
if (ret) {
krb5_set_error_message(context, ret, "ASN.1 encoding of ReplyKeyPack "
"failed (%d)", ret);
goto out;
}
if (buf.length != size)
krb5_abortx(context, "Internal ASN.1 encoder error");
{
hx509_query *q;
hx509_cert cert;
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,
sdAlg,
buf.data,
buf.length,
NULL,
cert,
cp->peer,
cp->client_anchors,
kdc_identity->certpool,
&signed_data);
*kdc_cert = cert;
}
krb5_data_free(&buf);
if (ret)
goto out;
if (cp->type == PKINIT_WIN2K) {
ret = hx509_cms_wrap_ContentInfo(&asn1_oid_id_pkcs7_signedData,
&signed_data,
&buf);
if (ret)
goto out;
krb5_data_free(&signed_data);
signed_data = buf;
}
ret = hx509_cms_envelope_1(context->hx509ctx,
HX509_CMS_EV_NO_KU_CHECK,
cp->cert,
signed_data.data, signed_data.length,
envelopedAlg,
evAlg, &buf);
if (ret)
goto out;
ret = _krb5_pk_mk_ContentInfo(context,
&buf,
&asn1_oid_id_pkcs7_envelopedData,
content_info);
out:
if (ret && *kdc_cert) {
hx509_cert_free(*kdc_cert);
*kdc_cert = NULL;
}
krb5_data_free(&buf);
krb5_data_free(&signed_data);
return ret;
}
/*
*
*/
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;
const BIGNUM *pub_key;
heim_integer i;
DH_get0_key(kdc_dh, &pub_key, NULL);
ret = BN_to_integer(context, 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);
#ifdef HAVE_OPENSSL
} else if (cp->keyex == USE_ECDH) {
unsigned char *p;
int len;
len = i2o_ECPublicKey(cp->u.ecdh.key, NULL);
if (len <= 0)
abort();
p = malloc(len);
if (p == NULL)
abort();
dh_info.subjectPublicKey.length = len * 8;
dh_info.subjectPublicKey.data = p;
len = i2o_ECPublicKey(cp->u.ecdh.key, &p);
if (len <= 0)
abort();
#endif
} 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;
}
/*
*
*/
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;
#ifdef HAVE_OPENSSL
case USE_ECDH: type = "ecdh"; break;
#endif
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");
/* XXX KRB-FX-CF2 */
ret = krb5_generate_random_keyblock(context, sessionetype,
sessionkey);
if (ret) {
free_PA_PK_AS_REP(&rep);
goto out;
}
/* XXX Add PA-PKINIT-KX */
}
#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)
*reply_key = &cp->reply_key;
return ret;
}
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;
}
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 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");
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_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++) {
ret = hx509_cert_init_data(context->hx509ctx,
pc->val[j].cert.data,
pc->val[j].cert.length,
&cert);
if (ret)
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
add_principal_mapping(krb5_context context,
const char *principal_name,
const char * subject)
{
struct pk_allowed_princ *tmp;
krb5_principal principal;
krb5_error_code ret;
tmp = realloc(principal_mappings.val,
(principal_mappings.len + 1) * sizeof(*tmp));
if (tmp == NULL)
return ENOMEM;
principal_mappings.val = tmp;
ret = krb5_parse_name(context, principal_name, &principal);
if (ret)
return ret;
principal_mappings.val[principal_mappings.len].principal = principal;
principal_mappings.val[principal_mappings.len].subject = strdup(subject);
if (principal_mappings.val[principal_mappings.len].subject == NULL) {
krb5_free_principal(context, principal);
return ENOMEM;
}
principal_mappings.len++;
return 0;
}
krb5_error_code
_kdc_add_inital_verified_cas(krb5_context context,
krb5_kdc_configuration *config,
pk_client_params *cp,
EncTicketPart *tkt)
{
AD_INITIAL_VERIFIED_CAS cas;
krb5_error_code ret;
krb5_data data;
size_t size = 0;
memset(&cas, 0, sizeof(cas));
/* XXX add CAs to cas here */
ASN1_MALLOC_ENCODE(AD_INITIAL_VERIFIED_CAS, data.data, data.length,
&cas, &size, ret);
if (ret)
return ret;
if (data.length != size)
krb5_abortx(context, "internal asn.1 encoder error");
ret = _kdc_tkt_add_if_relevant_ad(context, tkt,
KRB5_AUTHDATA_INITIAL_VERIFIED_CAS,
&data);
krb5_data_free(&data);
return ret;
}
/*
*
*/
static void
load_mappings(krb5_context context, const char *fn)
{
krb5_error_code ret;
char buf[1024];
unsigned long lineno = 0;
FILE *f;
f = fopen(fn, "r");
if (f == NULL)
return;
while (fgets(buf, sizeof(buf), f) != NULL) {
char *subject_name, *p;
buf[strcspn(buf, "\n")] = '\0';
lineno++;
p = buf + strspn(buf, " \t");
if (*p == '#' || *p == '\0')
continue;
subject_name = strchr(p, ':');
if (subject_name == NULL) {
krb5_warnx(context, "pkinit mapping file line %lu "
"missing \":\" :%s",
lineno, buf);
continue;
}
*subject_name++ = '\0';
ret = add_principal_mapping(context, p, subject_name);
if (ret) {
krb5_warn(context, ret, "failed to add line %lu \":\" :%s\n",
lineno, buf);
continue;
}
}
fclose(f);
}
/*
*
*/
krb5_error_code
krb5_kdc_pk_initialize(krb5_context context,
krb5_kdc_configuration *config,
const char *user_id,
const char *anchors,
char **pool,
char **revoke_list)
{
const char *file;
char *fn = NULL;
krb5_error_code ret;
file = krb5_config_get_string(context, NULL,
"libdefaults", "moduli", NULL);
ret = _krb5_parse_moduli(context, file, &moduli);
if (ret)
krb5_err(context, 1, ret, "PKINIT: failed to load modidi file");
principal_mappings.len = 0;
principal_mappings.val = NULL;
ret = _krb5_pk_load_id(context,
&kdc_identity,
user_id,
anchors,
pool,
revoke_list,
NULL,
NULL,
NULL);
if (ret) {
krb5_warn(context, ret, "PKINIT: ");
config->enable_pkinit = 0;
return ret;
}
{
hx509_query *q;
hx509_cert cert;
ret = hx509_query_alloc(context->hx509ctx, &q);
if (ret) {
krb5_warnx(context, "PKINIT: out of memory");
return ENOMEM;
}
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 == 0) {
if (hx509_cert_check_eku(context->hx509ctx, cert,
&asn1_oid_id_pkkdcekuoid, 0)) {
hx509_name name;
char *str;
ret = hx509_cert_get_subject(cert, &name);
if (ret == 0) {
hx509_name_to_string(name, &str);
krb5_warnx(context, "WARNING Found KDC certificate (%s)"
"is missing the PK-INIT KDC EKU, this is bad for "
"interoperability.", str);
hx509_name_free(&name);
free(str);
}
}
hx509_cert_free(cert);
} else
krb5_warnx(context, "PKINIT: failed to find a signing "
"certifiate with a public key");
}
if (krb5_config_get_bool_default(context,
NULL,
FALSE,
"kdc",
"pkinit_allow_proxy_certificate",
NULL))
config->pkinit_allow_proxy_certs = 1;
file = krb5_config_get_string(context,
NULL,
"kdc",
"pkinit_mappings_file",
NULL);
if (file == NULL) {
asprintf(&fn, "%s/pki-mapping", hdb_db_dir(context));
file = fn;
}
load_mappings(context, file);
if (fn)
free(fn);
return 0;
}
#endif /* PKINIT */
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