--- /dev/null
+/*
+ * Copyright (c) 2011, JANET(UK)
+ * 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 JANET(UK) 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+
+/*
+ * General mechanism utility routines.
+ */
+
+#include "gssapiP_eap.h"
+
+/*
+ * 1.3.6.1.4.1.5322(padl)
+ * gssEap(22)
+ * mechanisms(1)
+ * eap-aes128-cts-hmac-sha1-96(17)
+ * eap-aes256-cts-hmac-sha1-96(18)
+ * nameTypes(2)
+ * apiExtensions(3)
+ * inquireSecContextByOid(1)
+ * inquireCredByOid(2)
+ * setSecContextOption(3)
+ * setCredOption(4)
+ * mechInvoke(5)
+ */
+
+/*
+ * Note: the enctype-less OID is used as the mechanism OID in non-
+ * canonicalized exported names.
+ */
+static gss_OID_desc gssEapMechOids[] = {
+ /* 1.3.6.1.4.1.5322.22.1 */
+ { 9, "\x2B\x06\x01\x04\x01\xA9\x4A\x16\x01" },
+ /* 1.3.6.1.4.1.5322.22.1.17 */
+ { 10, "\x2B\x06\x01\x04\x01\xA9\x4A\x16\x01\x11" },
+ /* 1.3.6.1.4.1.5322.22.1.18 */
+ { 10, "\x2B\x06\x01\x04\x01\xA9\x4A\x16\x01\x12" }
+};
+
+gss_OID GSS_EAP_MECHANISM = &gssEapMechOids[0];
+gss_OID GSS_EAP_AES128_CTS_HMAC_SHA1_96_MECHANISM = &gssEapMechOids[1];
+gss_OID GSS_EAP_AES256_CTS_HMAC_SHA1_96_MECHANISM = &gssEapMechOids[2];
+
+static int
+internalizeOid(const gss_OID oid,
+ gss_OID *const pInternalizedOid);
+
+/*
+ * Returns TRUE is the OID is a concrete mechanism OID, that is, one
+ * with a Kerberos enctype as the last element.
+ */
+int
+gssEapIsConcreteMechanismOid(const gss_OID oid)
+{
+ return oid->length > GSS_EAP_MECHANISM->length &&
+ memcmp(oid->elements, GSS_EAP_MECHANISM->elements,
+ GSS_EAP_MECHANISM->length) == 0;
+}
+
+int
+gssEapIsMechanismOid(const gss_OID oid)
+{
+ return oid == GSS_C_NO_OID ||
+ oidEqual(oid, GSS_EAP_MECHANISM) ||
+ gssEapIsConcreteMechanismOid(oid);
+}
+
+/*
+ * Validate that all elements are concrete mechanism OIDs.
+ */
+OM_uint32
+gssEapValidateMechs(OM_uint32 *minor,
+ const gss_OID_set mechs)
+{
+ int i;
+
+ *minor = 0;
+
+ if (mechs == GSS_C_NO_OID_SET) {
+ return GSS_S_COMPLETE;
+ }
+
+ for (i = 0; i < mechs->count; i++) {
+ gss_OID oid = &mechs->elements[i];
+
+ if (!gssEapIsConcreteMechanismOid(oid)) {
+ *minor = GSSEAP_WRONG_MECH;
+ return GSS_S_BAD_MECH;
+ }
+ }
+
+ return GSS_S_COMPLETE;
+}
+
+OM_uint32
+gssEapOidToEnctype(OM_uint32 *minor,
+ const gss_OID oid,
+ krb5_enctype *enctype)
+{
+ OM_uint32 major;
+ int suffix;
+
+ major = decomposeOid(minor,
+ GSS_EAP_MECHANISM->elements,
+ GSS_EAP_MECHANISM->length,
+ oid,
+ &suffix);
+ if (major == GSS_S_COMPLETE)
+ *enctype = suffix;
+
+ return major;
+}
+
+OM_uint32
+gssEapEnctypeToOid(OM_uint32 *minor,
+ krb5_enctype enctype,
+ gss_OID *pOid)
+{
+ OM_uint32 major;
+ gss_OID oid;
+
+ *pOid = NULL;
+
+ oid = (gss_OID)GSSEAP_MALLOC(sizeof(*oid));
+ if (oid == NULL) {
+ *minor = ENOMEM;
+ return GSS_S_FAILURE;
+ }
+
+ oid->length = GSS_EAP_MECHANISM->length + 1;
+ oid->elements = GSSEAP_MALLOC(oid->length);
+ if (oid->elements == NULL) {
+ *minor = ENOMEM;
+ GSSEAP_FREE(oid);
+ return GSS_S_FAILURE;
+ }
+
+ major = composeOid(minor,
+ GSS_EAP_MECHANISM->elements,
+ GSS_EAP_MECHANISM->length,
+ enctype,
+ oid);
+ if (major == GSS_S_COMPLETE) {
+ internalizeOid(oid, pOid);
+ *pOid = oid;
+ } else {
+ GSSEAP_FREE(oid->elements);
+ GSSEAP_FREE(oid);
+ }
+
+ return major;
+}
+
+OM_uint32
+gssEapIndicateMechs(OM_uint32 *minor,
+ gss_OID_set *mechs)
+{
+ krb5_context krbContext;
+ OM_uint32 major, tmpMinor;
+ krb5_enctype *etypes;
+ int i;
+
+ GSSEAP_KRB_INIT(&krbContext);
+
+ *minor = krb5_get_permitted_enctypes(krbContext, &etypes);
+ if (*minor != 0) {
+ return GSS_S_FAILURE;
+ }
+
+ major = gss_create_empty_oid_set(minor, mechs);
+ if (GSS_ERROR(major)) {
+ GSSEAP_FREE(etypes);
+ return major;
+ }
+
+ for (i = 0; etypes[i] != ENCTYPE_NULL; i++) {
+ gss_OID mechOid;
+
+ /* XXX currently we aren't equipped to encode these enctypes */
+ if (etypes[i] < 0 || etypes[i] > 127)
+ continue;
+
+ major = gssEapEnctypeToOid(minor, etypes[i], &mechOid);
+ if (GSS_ERROR(major))
+ break;
+
+ major = gss_add_oid_set_member(minor, mechOid, mechs);
+ if (GSS_ERROR(major))
+ break;
+
+ gss_release_oid(&tmpMinor, &mechOid);
+ }
+
+ GSSEAP_FREE(etypes);
+
+ *minor = 0;
+ return major;
+}
+
+OM_uint32
+gssEapDefaultMech(OM_uint32 *minor,
+ gss_OID *oid)
+{
+ gss_OID_set mechs;
+ OM_uint32 major, tmpMinor;
+
+ major = gssEapIndicateMechs(minor, &mechs);
+ if (GSS_ERROR(major)) {
+ return major;
+ }
+
+ if (mechs->count == 0) {
+ gss_release_oid_set(&tmpMinor, &mechs);
+ return GSS_S_BAD_MECH;
+ }
+
+ if (!internalizeOid(&mechs->elements[0], oid)) {
+ /* don't double-free if we didn't internalize it */
+ mechs->elements[0].length = 0;
+ mechs->elements[0].elements = NULL;
+ }
+
+ gss_release_oid_set(&tmpMinor, &mechs);
+
+ *minor = 0;
+ return GSS_S_COMPLETE;
+}
+
+static int
+internalizeOid(const gss_OID oid,
+ gss_OID *const pInternalizedOid)
+{
+ int i;
+
+ *pInternalizedOid = GSS_C_NO_OID;
+
+ for (i = 0;
+ i < sizeof(gssEapMechOids) / sizeof(gssEapMechOids[0]);
+ i++) {
+ if (oidEqual(oid, &gssEapMechOids[i])) {
+ *pInternalizedOid = (const gss_OID)&gssEapMechOids[i];
+ break;
+ }
+ }
+
+ if (*pInternalizedOid == GSS_C_NO_OID) {
+ if (oidEqual(oid, GSS_EAP_NT_EAP_NAME))
+ *pInternalizedOid = (const gss_OID)GSS_EAP_NT_EAP_NAME;
+ }
+
+ if (*pInternalizedOid == GSS_C_NO_OID) {
+ *pInternalizedOid = oid;
+ return 0;
+ }
+
+ return 1;
+}
+
+OM_uint32
+gssEapReleaseOid(OM_uint32 *minor, gss_OID *oid)
+{
+ gss_OID internalizedOid = GSS_C_NO_OID;
+
+ *minor = 0;
+
+ if (internalizeOid(*oid, &internalizedOid)) {
+ /* OID was internalized, so we can mark it as "freed" */
+ *oid = GSS_C_NO_OID;
+ return GSS_S_COMPLETE;
+ }
+
+ /* we don't know about this OID */
+ return GSS_S_CONTINUE_NEEDED;
+}
+
+OM_uint32
+gssEapCanonicalizeOid(OM_uint32 *minor,
+ const gss_OID oid,
+ OM_uint32 flags,
+ gss_OID *pOid)
+{
+ OM_uint32 major;
+ int mapToNull = 0;
+
+ major = GSS_S_COMPLETE;
+ *minor = 0;
+ *pOid = GSS_C_NULL_OID;
+
+ if (oid == GSS_C_NULL_OID) {
+ if ((flags & OID_FLAG_NULL_VALID) == 0) {
+ *minor = GSSEAP_WRONG_MECH;
+ return GSS_S_BAD_MECH;
+ } else if (flags & OID_FLAG_MAP_NULL_TO_DEFAULT_MECH) {
+ return gssEapDefaultMech(minor, pOid);
+ } else {
+ mapToNull = 1;
+ }
+ } else if (oidEqual(oid, GSS_EAP_MECHANISM)) {
+ if ((flags & OID_FLAG_FAMILY_MECH_VALID) == 0) {
+ *minor = GSSEAP_WRONG_MECH;
+ return GSS_S_BAD_MECH;
+ } else if (flags & OID_FLAG_MAP_FAMILY_MECH_TO_NULL) {
+ mapToNull = 1;
+ }
+ } else if (!gssEapIsConcreteMechanismOid(oid)) {
+ *minor = GSSEAP_WRONG_MECH;
+ return GSS_S_BAD_MECH;
+ }
+
+ if (!mapToNull) {
+ if (!internalizeOid(oid, pOid))
+ major = duplicateOid(minor, oid, pOid);
+ }
+
+ return major;
+}
+
+static gss_buffer_desc gssEapSaslMechs[] = {
+ { sizeof("EAP") - 1, "EAP", }, /* not used */
+ { sizeof("EAP-AES128") - 1, "EAP-AES128" },
+ { sizeof("EAP-AES256") - 1, "EAP-AES256" },
+};
+
+gss_buffer_t
+gssEapOidToSaslName(const gss_OID oid)
+{
+ size_t i;
+
+ for (i = 1; i < sizeof(gssEapMechOids)/sizeof(gssEapMechOids[0]); i++) {
+ if (oidEqual(&gssEapMechOids[i], oid))
+ return &gssEapSaslMechs[i];
+ }
+
+ return GSS_C_NO_BUFFER;
+}
+
+gss_OID
+gssEapSaslNameToOid(const gss_buffer_t name)
+{
+ size_t i;
+
+ for (i = 1; i < sizeof(gssEapSaslMechs)/sizeof(gssEapSaslMechs[0]); i++) {
+ if (bufferEqual(&gssEapSaslMechs[i], name))
+ return &gssEapMechOids[i];
+ }
+
+ return GSS_C_NO_OID;
+}
projects / mech_eap.git / blobdiff