#include "gssapiP_eap.h"
+static OM_uint32
+policyVariableToFlag(enum eapol_bool_var variable)
+{
+ OM_uint32 flag = 0;
+
+ switch (variable) {
+ case EAPOL_eapSuccess:
+ flag = CTX_FLAG_EAP_SUCCESS;
+ break;
+ case EAPOL_eapRestart:
+ flag = CTX_FLAG_EAP_RESTART;
+ break;
+ case EAPOL_eapFail:
+ flag = CTX_FLAG_EAP_FAIL;
+ break;
+ case EAPOL_eapResp:
+ flag = CTX_FLAG_EAP_RESP;
+ break;
+ case EAPOL_eapNoResp:
+ flag = CTX_FLAG_EAP_NO_RESP;
+ break;
+ case EAPOL_eapReq:
+ flag = CTX_FLAG_EAP_REQ;
+ break;
+ case EAPOL_portEnabled:
+ flag = CTX_FLAG_EAP_PORT_ENABLED;
+ break;
+ case EAPOL_altAccept:
+ flag = CTX_FLAG_EAP_ALT_ACCEPT;
+ break;
+ case EAPOL_altReject:
+ flag = CTX_FLAG_EAP_ALT_REJECT;
+ break;
+ }
+
+ return flag;
+
+}
+
+static struct eap_peer_config *
+peerGetConfig(void *ctx)
+{
+ gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
+
+ return &gssCtx->initiatorCtx.eapPeerConfig;
+}
+
+static Boolean
+peerGetBool(void *data, enum eapol_bool_var variable)
+{
+ gss_ctx_id_t ctx = data;
+ OM_uint32 flag;
+
+ if (ctx == GSS_C_NO_CONTEXT)
+ return FALSE;
+
+ flag = policyVariableToFlag(variable);
+
+ return ((ctx->flags & flag) != 0);
+}
+
+static void
+peerSetBool(void *data, enum eapol_bool_var variable,
+ Boolean value)
+{
+ gss_ctx_id_t ctx = data;
+ OM_uint32 flag;
+
+ if (ctx == GSS_C_NO_CONTEXT)
+ return;
+
+ flag = policyVariableToFlag(variable);
+
+ if (value)
+ ctx->flags |= flag;
+ else
+ ctx->flags &= ~(flag);
+}
+
+static unsigned int
+peerGetInt(void *data, enum eapol_int_var variable)
+{
+ gss_ctx_id_t ctx = data;
+
+ if (ctx == GSS_C_NO_CONTEXT)
+ return FALSE;
+
+ assert(CTX_IS_INITIATOR(ctx));
+
+ switch (variable) {
+ case EAPOL_idleWhile:
+ return ctx->initiatorCtx.idleWhile;
+ break;
+ }
+
+ return 0;
+}
+
+static void
+peerSetInt(void *data, enum eapol_int_var variable,
+ unsigned int value)
+{
+ gss_ctx_id_t ctx = data;
+
+ if (ctx == GSS_C_NO_CONTEXT)
+ return;
+
+ assert(CTX_IS_INITIATOR(ctx));
+
+ switch (variable) {
+ case EAPOL_idleWhile:
+ ctx->initiatorCtx.idleWhile = value;
+ break;
+ }
+}
+
+static struct wpabuf *
+peerGetEapReqData(void *ctx)
+{
+ gss_ctx_id_t gssCtx = (gss_ctx_id_t)ctx;
+
+ return &gssCtx->initiatorCtx.reqData;
+}
+
+static void
+peerSetConfigBlob(void *ctx, struct wpa_config_blob *blob)
+{
+}
+
+static const struct wpa_config_blob *
+peerGetConfigBlob(void *ctx, const char *name)
+{
+ return NULL;
+}
+
+static void
+peerNotifyPending(void *ctx)
+{
+}
+
+static struct eapol_callbacks gssEapPolicyCallbacks = {
+ peerGetConfig,
+ peerGetBool,
+ peerSetBool,
+ peerGetInt,
+ peerSetInt,
+ peerGetEapReqData,
+ peerSetConfigBlob,
+ peerGetConfigBlob,
+ peerNotifyPending,
+};
+
+extern int wpa_debug_level;
+
+static OM_uint32
+peerConfigInit(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t ctx,
+ int loadConfig)
+{
+ krb5_context krbContext;
+ struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
+ krb5_error_code code;
+ char *identity;
+
+ GSSEAP_KRB_INIT(&krbContext);
+
+ if (loadConfig) {
+ eapPeerConfig->fragment_size = 1024;
+ wpa_debug_level = 0;
+ }
+
+ code = krb5_unparse_name(krbContext, cred->name->krbPrincipal, &identity);
+ if (code != 0) {
+ *minor = code;
+ return GSS_S_FAILURE;
+ }
+
+ eapPeerConfig->identity = (unsigned char *)identity;
+ eapPeerConfig->identity_len = strlen(identity);
+ eapPeerConfig->password = (unsigned char *)cred->password.value;
+ eapPeerConfig->password_len = cred->password.length;
+
+ return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+peerConfigFree(OM_uint32 *minor,
+ gss_ctx_id_t ctx)
+{
+ krb5_context krbContext;
+ struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
+
+ GSSEAP_KRB_INIT(&krbContext);
+
+ krb5_free_unparsed_name(krbContext, (char *)eapPeerConfig->identity);
+
+ return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
+{
+ OM_uint32 major;
+ const unsigned char *key;
+ size_t keyLength;
+
+ /* Cache encryption type derived from selected mechanism OID */
+ major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
+ if (GSS_ERROR(major))
+ return major;
+
+ if (ctx->encryptionType != ENCTYPE_NULL &&
+ eap_key_available(ctx->initiatorCtx.eap)) {
+ key = eap_get_eapKeyData(ctx->initiatorCtx.eap, &keyLength);
+
+ major = gssEapDeriveRfc3961Key(minor, key, keyLength,
+ ctx->encryptionType, &ctx->rfc3961Key);
+ if (GSS_ERROR(major))
+ return major;
+
+ major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
+ &ctx->checksumType);
+ if (GSS_ERROR(major))
+ return major;
+ } else {
+ /*
+ * draft-howlett-eap-gss says that integrity/confidentialty should
+ * always be advertised as available, but if we have no keying
+ * material it seems confusing to the caller to advertise this.
+ */
+ ctx->gssFlags &= ~(GSS_C_INTEG_FLAG | GSS_C_CONF_FLAG);
+ }
+
+ major = sequenceInit(minor,
+ &ctx->seqState,
+ ctx->recvSeq,
+ ((ctx->gssFlags & GSS_C_REPLAY_FLAG) != 0),
+ ((ctx->gssFlags & GSS_C_SEQUENCE_FLAG) != 0),
+ TRUE);
+ if (GSS_ERROR(major))
+ return major;
+
+ return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+eapGssSmInitAuthenticate(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t ctx,
+ gss_name_t target,
+ gss_OID mech,
+ OM_uint32 reqFlags,
+ OM_uint32 timeReq,
+ gss_channel_bindings_t chanBindings,
+ gss_buffer_t inputToken,
+ gss_buffer_t outputToken)
+{
+ OM_uint32 major;
+ OM_uint32 tmpMajor, tmpMinor;
+ time_t now;
+ int initialContextToken = 0, code;
+ gss_buffer_desc respBuf;
+
+ respBuf.length = 0;
+ respBuf.value = NULL;
+
+ initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
+ inputToken->length == 0);
+
+ major = peerConfigInit(minor, cred, ctx, initialContextToken);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ if (initialContextToken) {
+ struct eap_config eapConfig;
+
+ memset(&eapConfig, 0, sizeof(eapConfig));
+ ctx->flags |= CTX_FLAG_EAP_PORT_ENABLED;
+
+ ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
+ &gssEapPolicyCallbacks,
+ ctx,
+ &eapConfig);
+
+ time(&now);
+ if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
+ ctx->expiryTime = 0;
+ else
+ ctx->expiryTime = now + timeReq;
+
+ major = gss_duplicate_name(minor, cred->name, &ctx->initiatorName);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ major = gss_duplicate_name(minor, target, &ctx->acceptorName);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ if (mech == GSS_C_NULL_OID || oidEqual(mech, GSS_EAP_MECHANISM)) {
+ major = gssEapDefaultMech(minor, &ctx->mechanismUsed);
+ } else if (gssEapIsConcreteMechanismOid(mech)) {
+ if (!gssEapInternalizeOid(mech, &ctx->mechanismUsed))
+ major = duplicateOid(minor, mech, &ctx->mechanismUsed);
+ } else {
+ major = GSS_S_BAD_MECH;
+ }
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ /* If credentials were provided, check they're usable with this mech */
+ if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
+ major = GSS_S_BAD_MECH;
+ goto cleanup;
+ }
+
+ respBuf.value = ""; /* emit empty inner token */
+ major = GSS_S_CONTINUE_NEEDED;
+ goto cleanup;
+ } else {
+ ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
+ }
+
+ wpabuf_set(&ctx->initiatorCtx.reqData,
+ inputToken->value, inputToken->length);
+
+ major = GSS_S_CONTINUE_NEEDED;
+
+ code = eap_peer_sm_step(ctx->initiatorCtx.eap);
+ if (ctx->flags & CTX_FLAG_EAP_RESP) {
+ struct wpabuf *resp;
+
+ ctx->flags &= ~(CTX_FLAG_EAP_RESP);
+
+ resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
+ if (resp != NULL) {
+ respBuf.length = wpabuf_len(resp);
+ respBuf.value = (void *)wpabuf_head(resp);
+ }
+ } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
+ major = initReady(minor, ctx);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
+ major = GSS_S_CONTINUE_NEEDED;
+ ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
+ } else if ((ctx->flags & CTX_FLAG_EAP_FAIL) || code == 0) {
+ major = GSS_S_FAILURE;
+ }
+
+cleanup:
+ if (respBuf.value != NULL) {
+ OM_uint32 tmpMajor;
+
+ assert(major == GSS_S_CONTINUE_NEEDED);
+
+ tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
+ if (GSS_ERROR(tmpMajor)) {
+ major = tmpMajor;
+ *minor = tmpMinor;
+ }
+ }
+
+ wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
+ peerConfigFree(&tmpMinor, ctx);
+
+ return major;
+}
+
+#if 0
+static OM_uint32
+eapGssSmInitKeyTransport(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t ctx,
+ gss_name_t target,
+ gss_OID mech,
+ OM_uint32 reqFlags,
+ OM_uint32 timeReq,
+ gss_channel_bindings_t chanBindings,
+ gss_buffer_t inputToken,
+ gss_buffer_t outputToken)
+{
+ GSSEAP_NOT_IMPLEMENTED;
+}
+
+static OM_uint32
+eapGssSmInitSecureAssoc(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t ctx,
+ gss_name_t target,
+ gss_OID mech,
+ OM_uint32 reqFlags,
+ OM_uint32 timeReq,
+ gss_channel_bindings_t chanBindings,
+ gss_buffer_t inputToken,
+ gss_buffer_t outputToken)
+{
+ GSSEAP_NOT_IMPLEMENTED;
+}
+#endif
+
+static OM_uint32
+eapGssSmInitGssChannelBindings(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t ctx,
+ gss_name_t target,
+ gss_OID mech,
+ OM_uint32 reqFlags,
+ OM_uint32 timeReq,
+ gss_channel_bindings_t chanBindings,
+ gss_buffer_t inputToken,
+ gss_buffer_t outputToken)
+{
+ OM_uint32 major, tmpMinor;
+ gss_iov_buffer_desc iov[2];
+ gss_buffer_desc buf;
+
+ iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
+ iov[0].buffer.length = 0;
+ iov[0].buffer.value = NULL;
+
+ iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER | GSS_IOV_BUFFER_FLAG_ALLOCATE;
+ iov[1].buffer.length = 0;
+ iov[1].buffer.value = NULL;
+
+ if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
+ iov[0].buffer = chanBindings->application_data;
+
+ major = gssEapWrapOrGetMIC(minor, ctx, FALSE, FALSE, iov, 2,
+ TOK_TYPE_GSS_CB);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ /* Skip past token ID */
+ assert(iov[1].buffer.length > 2);
+ assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
+
+ buf.length = iov[1].buffer.length - 2;
+ buf.value = (unsigned char *)iov[1].buffer.value + 2;
+
+ major = duplicateBuffer(minor, &buf, outputToken);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ major = GSS_S_COMPLETE;
+ ctx->state = EAP_STATE_ESTABLISHED;
+
+cleanup:
+ gssEapReleaseIov(iov, 2);
+
+ return major;
+}
+
+static OM_uint32
+eapGssSmInitEstablished(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t ctx,
+ gss_name_t target,
+ gss_OID mech,
+ OM_uint32 reqFlags,
+ OM_uint32 timeReq,
+ gss_channel_bindings_t chanBindings,
+ gss_buffer_t inputToken,
+ gss_buffer_t outputToken)
+{
+ /* Called with already established context */
+ *minor = EINVAL;
+ return GSS_S_BAD_STATUS;
+}
+
+static struct gss_eap_initiator_sm {
+ enum gss_eap_token_type inputTokenType;
+ enum gss_eap_token_type outputTokenType;
+ OM_uint32 (*processToken)(OM_uint32 *,
+ gss_cred_id_t,
+ gss_ctx_id_t,
+ gss_name_t,
+ gss_OID,
+ OM_uint32,
+ OM_uint32,
+ gss_channel_bindings_t,
+ gss_buffer_t,
+ gss_buffer_t);
+} eapGssInitiatorSm[] = {
+ { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitAuthenticate },
+#if 0
+ { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitKeyTransport },
+ { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitSecureAssoc },
+#endif
+ { TOK_TYPE_NONE, TOK_TYPE_GSS_CB, eapGssSmInitGssChannelBindings },
+ { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmInitEstablished },
+};
+
+OM_uint32
+gss_init_sec_context(OM_uint32 *minor,
+ gss_cred_id_t cred,
+ gss_ctx_id_t *context_handle,
+ gss_name_t target_name,
+ gss_OID mech_type,
+ OM_uint32 req_flags,
+ OM_uint32 time_req,
+ gss_channel_bindings_t input_chan_bindings,
+ gss_buffer_t input_token,
+ gss_OID *actual_mech_type,
+ gss_buffer_t output_token,
+ OM_uint32 *ret_flags,
+ OM_uint32 *time_rec)
+{
+ OM_uint32 major;
+ OM_uint32 tmpMajor, tmpMinor;
+ gss_ctx_id_t ctx = *context_handle;
+ struct gss_eap_initiator_sm *sm = NULL;
+ gss_buffer_desc innerInputToken, innerOutputToken;
+
+ *minor = 0;
+
+ innerOutputToken.length = 0;
+ innerOutputToken.value = NULL;
+
+ output_token->length = 0;
+ output_token->value = NULL;
+
+ if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_INITIATE)) {
+ return GSS_S_NO_CRED;
+ }
+
+ if (ctx == GSS_C_NO_CONTEXT) {
+ if (input_token != GSS_C_NO_BUFFER && input_token->length != 0) {
+ return GSS_S_DEFECTIVE_TOKEN;
+ }
+
+ major = gssEapAllocContext(minor, &ctx);
+ if (GSS_ERROR(major))
+ return major;
+
+ ctx->flags |= CTX_FLAG_INITIATOR;
+
+ *context_handle = ctx;
+ }
+
+ GSSEAP_MUTEX_LOCK(&ctx->mutex);
+
+ sm = &eapGssInitiatorSm[ctx->state];
+
+ if (input_token != GSS_C_NO_BUFFER) {
+ major = gssEapVerifyToken(minor, ctx, input_token,
+ sm->inputTokenType, &innerInputToken);
+ if (GSS_ERROR(major))
+ goto cleanup;
+ } else {
+ innerInputToken.length = 0;
+ innerInputToken.value = NULL;
+ }
+
+ /*
+ * Advance through state machine whilst empty tokens are emitted and
+ * the status is not GSS_S_COMPLETE or an error status.
+ */
+ do {
+ sm = &eapGssInitiatorSm[ctx->state];
+
+ major = (sm->processToken)(minor,
+ cred,
+ ctx,
+ target_name,
+ mech_type,
+ req_flags,
+ time_req,
+ input_chan_bindings,
+ &innerInputToken,
+ &innerOutputToken);
+ if (GSS_ERROR(major))
+ goto cleanup;
+ } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.value == NULL);
+
+ if (actual_mech_type != NULL) {
+ if (!gssEapInternalizeOid(ctx->mechanismUsed, actual_mech_type))
+ duplicateOid(&tmpMinor, ctx->mechanismUsed, actual_mech_type);
+ }
+ if (innerOutputToken.value != NULL) {
+ tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
+ sm->outputTokenType, output_token);
+ if (GSS_ERROR(tmpMajor)) {
+ major = tmpMajor;
+ *minor = tmpMinor;
+ goto cleanup;
+ }
+ }
+ if (ret_flags != NULL)
+ *ret_flags = ctx->gssFlags;
+ if (time_rec != NULL)
+ gss_context_time(&tmpMinor, ctx, time_rec);
+
+ assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
+
+cleanup:
+ GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
+
+ if (GSS_ERROR(major))
+ gssEapReleaseContext(&tmpMinor, context_handle);
+
+ gss_release_buffer(&tmpMinor, &innerOutputToken);
+
+ return major;
+}
projects / mech_eap.git / blobdiff