X-Git-Url: http://www.project-moonshot.org/gitweb/?a=blobdiff_plain;f=mech_eap%2Faccept_sec_context.c;h=16e60fbd1a1f814227aade4ebc98fd8b87efea1f;hb=806475d7e7d185314fcba8417660369d01ca47f7;hp=d192d71f4a33ae973e9fd8de4349eb65a0c08c2f;hpb=506490b8b79a8a6f36f4321e299d0052f99ae46b;p=moonshot.git diff --git a/mech_eap/accept_sec_context.c b/mech_eap/accept_sec_context.c index d192d71..16e60fb 100644 --- a/mech_eap/accept_sec_context.c +++ b/mech_eap/accept_sec_context.c @@ -40,11 +40,16 @@ #ifdef GSSEAP_ENABLE_REAUTH static OM_uint32 eapGssSmAcceptGssReauth(OM_uint32 *minor, - gss_ctx_id_t ctx, gss_cred_id_t cred, - gss_buffer_t inputToken, + 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 outputToken); + gss_buffer_t inputToken, + gss_buffer_t outputToken, + OM_uint32 *smFlags); #endif /* @@ -67,7 +72,7 @@ acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred) major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps, PW_USER_NAME, 0, &vp); - if (major == GSS_S_COMPLETE) { + if (major == GSS_S_COMPLETE && vp->length) { nameBuf.length = vp->length; nameBuf.value = vp->vp_strvalue; } else { @@ -77,6 +82,7 @@ acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred) major = gssEapImportName(minor, &nameBuf, (ctx->gssFlags & GSS_C_ANON_FLAG) ? GSS_C_NT_ANONYMOUS : GSS_C_NT_USER_NAME, + ctx->mechanismUsed, &ctx->initiatorName); if (GSS_ERROR(major)) return major; @@ -115,39 +121,140 @@ acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred) if (GSS_ERROR(major)) return major; + if (ctx->expiryTime < time(NULL)) { + *minor = GSSEAP_CRED_EXPIRED; + return GSS_S_CREDENTIALS_EXPIRED; + } + *minor = 0; return GSS_S_COMPLETE; } +static OM_uint32 +gssEapSupportedInitiatorExts[] = { +}; + +static struct gss_eap_itok_map +gssEapAcceptorExtsFlagMap[] = { + { ITOK_TYPE_REAUTH_CREDS, CTX_FLAG_KRB_REAUTH_SUPPORTED }, +}; + +static OM_uint32 +eapGssSmAcceptExts(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx GSSEAP_UNUSED, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken, + gss_buffer_t outputToken, + OM_uint32 *smFlags GSSEAP_UNUSED) +{ + OM_uint32 major; + + major = gssEapProcessSupportedExts(minor, inputToken, + gssEapAcceptorExtsFlagMap, + sizeof(gssEapAcceptorExtsFlagMap) / + sizeof(gssEapAcceptorExtsFlagMap[0]), + &ctx->flags); + if (GSS_ERROR(major)) + return major; + + major = gssEapEncodeSupportedExts(minor, + gssEapSupportedInitiatorExts, + sizeof(gssEapSupportedInitiatorExts) / + sizeof(gssEapSupportedInitiatorExts[0]), + outputToken); + if (GSS_ERROR(major)) + return major; + + return GSS_S_CONTINUE_NEEDED; +} + +static OM_uint32 +eapGssSmAcceptAcceptorName(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken GSSEAP_UNUSED, + gss_buffer_t outputToken, + OM_uint32 *smFlags GSSEAP_UNUSED) +{ + OM_uint32 major; + + /* XXX TODO import and validate name from inputToken */ + + if (ctx->acceptorName != GSS_C_NO_NAME) { + /* Send desired target name to acceptor */ + major = gssEapDisplayName(minor, ctx->acceptorName, + outputToken, NULL); + if (GSS_ERROR(major)) + return major; + } + + return GSS_S_CONTINUE_NEEDED; +} + +#ifdef GSSEAP_DEBUG +static OM_uint32 +eapGssSmAcceptVendorInfo(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx GSSEAP_UNUSED, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken, + gss_buffer_t outputToken GSSEAP_UNUSED, + OM_uint32 *smFlags GSSEAP_UNUSED) +{ + fprintf(stderr, "GSS-EAP: vendor: %.*s\n", + (int)inputToken->length, (char *)inputToken->value); + + *minor = 0; + return GSS_S_CONTINUE_NEEDED; +} +#endif + + /* * Emit a identity EAP request to force the initiator (peer) to identify * itself. */ static OM_uint32 eapGssSmAcceptIdentity(OM_uint32 *minor, - gss_ctx_id_t ctx, gss_cred_id_t cred, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, gss_buffer_t inputToken, - gss_channel_bindings_t chanBindings, - gss_buffer_t outputToken) + gss_buffer_t outputToken, + OM_uint32 *smFlags) { OM_uint32 major; struct wpabuf *reqData; gss_buffer_desc pktBuffer; + if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) { + *minor = GSSEAP_CRED_MECH_MISMATCH; + return GSS_S_BAD_MECH; + } + if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0) { *minor = GSSEAP_WRONG_SIZE; return GSS_S_DEFECTIVE_TOKEN; } - assert(ctx->acceptorName == GSS_C_NO_NAME); - - if (cred->name != GSS_C_NO_NAME) { - major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName); - if (GSS_ERROR(major)) - return major; - } - reqData = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_IDENTITY, 0, EAP_CODE_REQUEST, 0); if (reqData == NULL) { @@ -162,11 +269,13 @@ eapGssSmAcceptIdentity(OM_uint32 *minor, if (GSS_ERROR(major)) return major; - ctx->state = GSSEAP_STATE_AUTHENTICATE; - wpabuf_free(reqData); + GSSEAP_SM_TRANSITION_NEXT(ctx); + *minor = 0; + *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL; + return GSS_S_CONTINUE_NEEDED; } @@ -212,7 +321,7 @@ importInitiatorIdentity(OM_uint32 *minor, gssEapReleaseName(&tmpMinor, &ctx->initiatorName); return gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME, - &ctx->initiatorName); + ctx->mechanismUsed, &ctx->initiatorName); } /* @@ -360,7 +469,7 @@ createRadiusHandle(OM_uint32 *minor, assert(actx->radContext == NULL); assert(actx->radConn == NULL); - if (rs_context_create(&actx->radContext, RS_DICT_FILE) != 0) { + if (rs_context_create(&actx->radContext) != 0) { *minor = GSSEAP_RADSEC_CONTEXT_FAILURE; return GSS_S_FAILURE; } @@ -382,6 +491,11 @@ createRadiusHandle(OM_uint32 *minor, goto fail; } + if (rs_context_init_freeradius_dict(actx->radContext, NULL) != 0) { + err = rs_err_ctx_pop(actx->radContext); + goto fail; + } + if (rs_conn_create(actx->radContext, &actx->radConn, configStanza) != 0) { err = rs_err_conn_pop(actx->radConn); goto fail; @@ -406,11 +520,16 @@ fail: */ static OM_uint32 eapGssSmAcceptAuthenticate(OM_uint32 *minor, - gss_ctx_id_t ctx, gss_cred_id_t cred, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, gss_buffer_t inputToken, - gss_channel_bindings_t chanBindings, - gss_buffer_t outputToken) + gss_buffer_t outputToken, + OM_uint32 *smFlags) { OM_uint32 major, tmpMinor; struct rs_connection *rconn; @@ -478,9 +597,8 @@ eapGssSmAcceptAuthenticate(OM_uint32 *minor, frresp = rs_packet_frpkt(resp); switch (frresp->code) { - case PW_AUTHENTICATION_ACK: case PW_ACCESS_CHALLENGE: - major = GSS_S_CONTINUE_NEEDED; + case PW_AUTHENTICATION_ACK: break; case PW_AUTHENTICATION_REJECT: *minor = GSSEAP_RADIUS_AUTH_FAILURE; @@ -512,137 +630,286 @@ eapGssSmAcceptAuthenticate(OM_uint32 *minor, ctx->acceptorCtx.vps = frresp->vps; frresp->vps = NULL; - rs_conn_destroy(ctx->acceptorCtx.radConn); - ctx->acceptorCtx.radConn = NULL; - major = acceptReadyEap(minor, ctx, cred); if (GSS_ERROR(major)) goto cleanup; - ctx->state = GSSEAP_STATE_EXTENSIONS_REQ; + GSSEAP_SM_TRANSITION_NEXT(ctx); } - *minor = 0; major = GSS_S_CONTINUE_NEEDED; + *minor = 0; + *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL; cleanup: if (request != NULL) rs_request_destroy(request); if (req != NULL) rs_packet_destroy(req); + if (resp != NULL) + rs_packet_destroy(resp); + if (GSSEAP_SM_STATE(ctx) == GSSEAP_STATE_INITIATOR_EXTS) { + assert(major == GSS_S_CONTINUE_NEEDED); + + rs_conn_destroy(ctx->acceptorCtx.radConn); + ctx->acceptorCtx.radConn = NULL; + } return major; } static OM_uint32 -eapGssSmAcceptExtensionsReq(OM_uint32 *minor, - gss_ctx_id_t ctx, - gss_cred_id_t cred, - gss_buffer_t inputToken, - gss_channel_bindings_t chanBindings, - gss_buffer_t outputToken) +eapGssSmAcceptGssFlags(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken, + gss_buffer_t outputToken GSSEAP_UNUSED, + OM_uint32 *smFlags GSSEAP_UNUSED) { - OM_uint32 major; + unsigned char *p; + OM_uint32 initiatorGssFlags; - major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken); - if (GSS_ERROR(major)) - return major; + assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0); - outputToken->length = 0; - outputToken->value = NULL; + if (inputToken->length < 4) { + *minor = GSSEAP_TOK_TRUNC; + return GSS_S_DEFECTIVE_TOKEN; + } - ctx->state = GSSEAP_STATE_EXTENSIONS_RESP; + /* allow flags to grow for future expansion */ + p = (unsigned char *)inputToken->value + inputToken->length - 4; + + initiatorGssFlags = load_uint32_be(p); + initiatorGssFlags &= GSSEAP_WIRE_FLAGS_MASK; + + ctx->gssFlags |= initiatorGssFlags; - *minor = 0; return GSS_S_CONTINUE_NEEDED; } static OM_uint32 -eapGssSmAcceptExtensionsResp(OM_uint32 *minor, - gss_ctx_id_t ctx, - gss_cred_id_t cred, - gss_buffer_t inputToken, - gss_channel_bindings_t chanBindings, - gss_buffer_t outputToken) +eapGssSmAcceptGssChannelBindings(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings, + gss_buffer_t inputToken, + gss_buffer_t outputToken GSSEAP_UNUSED, + OM_uint32 *smFlags GSSEAP_UNUSED) { - OM_uint32 major; + OM_uint32 major, tmpMinor; + gss_iov_buffer_desc iov[2]; + + assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0); + + iov[0].type = GSS_IOV_BUFFER_TYPE_DATA | GSS_IOV_BUFFER_FLAG_ALLOCATE; + iov[0].buffer.length = 0; + iov[0].buffer.value = NULL; + + iov[1].type = GSS_IOV_BUFFER_TYPE_STREAM; + iov[1].buffer = *inputToken; - major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken); + major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL, + iov, 2, TOK_TYPE_WRAP); if (GSS_ERROR(major)) return major; - ctx->state = GSSEAP_STATE_ESTABLISHED; + if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS && + !bufferEqual(&iov[0].buffer, &chanBindings->application_data)) { + major = GSS_S_BAD_BINDINGS; + *minor = GSSEAP_BINDINGS_MISMATCH; + } else { + major = GSS_S_CONTINUE_NEEDED; + *minor = 0; + } - *minor = 0; - return GSS_S_COMPLETE; + gss_release_buffer(&tmpMinor, &iov[0].buffer); + + return major; } +#ifdef GSSEAP_ENABLE_REAUTH static OM_uint32 -eapGssSmAcceptEstablished(OM_uint32 *minor, - gss_ctx_id_t ctx, +eapGssSmAcceptReauthCreds(OM_uint32 *minor, gss_cred_id_t cred, - gss_buffer_t inputToken, - gss_channel_bindings_t chanBindings, - gss_buffer_t outputToken) + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken GSSEAP_UNUSED, + gss_buffer_t outputToken, + OM_uint32 *smFlags GSSEAP_UNUSED) { - /* Called with already established context */ - *minor = GSSEAP_CONTEXT_ESTABLISHED; - return GSS_S_BAD_STATUS; + OM_uint32 major; + + /* + * If we're built with fast reauthentication enabled, then + * fabricate a ticket from the initiator to ourselves. + */ + if (ctx->flags & CTX_FLAG_KRB_REAUTH_SUPPORTED) + major = gssEapMakeReauthCreds(minor, ctx, cred, outputToken); + else + major = GSS_S_UNAVAILABLE; + + if (major == GSS_S_UNAVAILABLE) + major = GSS_S_COMPLETE; + + return GSS_ERROR(major) ? major : GSS_S_CONTINUE_NEEDED; } +#endif static OM_uint32 -makeErrorToken(OM_uint32 *minor, - OM_uint32 majorStatus, - OM_uint32 minorStatus, - gss_buffer_t outputToken) +eapGssSmAcceptInitiatorMIC(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken, + gss_buffer_t outputToken GSSEAP_UNUSED, + OM_uint32 *smFlags GSSEAP_UNUSED) { - unsigned char errorData[8]; - gss_buffer_desc errorBuffer; + OM_uint32 major; - assert(GSS_ERROR(majorStatus)); + assert((ctx->flags & CTX_FLAG_KRB_REAUTH) == 0); - /* - * Only return error codes that the initiator could have caused, - * to avoid information leakage. - */ - if (IS_RADIUS_ERROR(minorStatus)) { - /* Squash RADIUS error codes */ - minorStatus = GSSEAP_RADIUS_PROT_FAILURE; - } else if (!IS_WIRE_ERROR(minorStatus)) { - /* Don't return non-wire error codes */ - return GSS_S_COMPLETE; - } + major = gssEapVerifyConversationMIC(minor, ctx, inputToken); + if (GSS_ERROR(major)) + return major; - minorStatus -= ERROR_TABLE_BASE_eapg; + GSSEAP_SM_TRANSITION_NEXT(ctx); - store_uint32_be(majorStatus, &errorData[0]); - store_uint32_be(minorStatus, &errorData[4]); + *minor = 0; - errorBuffer.length = sizeof(errorData); - errorBuffer.value = errorData; + return GSS_S_CONTINUE_NEEDED; +} - return duplicateBuffer(minor, &errorBuffer, outputToken); +static OM_uint32 +eapGssSmAcceptAcceptorMIC(OM_uint32 *minor, + gss_cred_id_t cred GSSEAP_UNUSED, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech GSSEAP_UNUSED, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t chanBindings GSSEAP_UNUSED, + gss_buffer_t inputToken GSSEAP_UNUSED, + gss_buffer_t outputToken, + OM_uint32 *smFlags) +{ + OM_uint32 major; + + major = gssEapGetConversationMIC(minor, ctx, outputToken); + if (GSS_ERROR(major)) + return major; + + GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ESTABLISHED); + + *minor = 0; + *smFlags |= SM_FLAG_SEND_TOKEN | SM_FLAG_OUTPUT_TOKEN_CRITICAL; + + return GSS_S_COMPLETE; } -static struct gss_eap_acceptor_sm { - enum gss_eap_token_type inputTokenType; - enum gss_eap_token_type outputTokenType; - OM_uint32 (*processToken)(OM_uint32 *, - gss_ctx_id_t, - gss_cred_id_t, - gss_buffer_t, - gss_channel_bindings_t, - gss_buffer_t); -} eapGssAcceptorSm[] = { - { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptIdentity }, - { TOK_TYPE_EAP_RESP, TOK_TYPE_EAP_REQ, eapGssSmAcceptAuthenticate }, - { TOK_TYPE_EXT_REQ, TOK_TYPE_NONE, eapGssSmAcceptExtensionsReq }, - { TOK_TYPE_NONE, TOK_TYPE_EXT_RESP, eapGssSmAcceptExtensionsResp }, - { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmAcceptEstablished }, - { TOK_TYPE_NONE, TOK_TYPE_CONTEXT_ERR, NULL }, +/* + * Acceptor state machine. + */ +static struct gss_eap_sm eapGssAcceptorSm[] = { +#ifdef GSSEAP_ENABLE_REAUTH + { + ITOK_TYPE_REAUTH_REQ, + ITOK_TYPE_REAUTH_RESP, + GSSEAP_STATE_INITIAL | GSSEAP_STATE_REAUTHENTICATE, + 0, + eapGssSmAcceptGssReauth, + }, +#endif + { + ITOK_TYPE_ACCEPTOR_NAME_REQ, + ITOK_TYPE_ACCEPTOR_NAME_RESP, + GSSEAP_STATE_INITIAL, + 0, + eapGssSmAcceptAcceptorName + }, + { + ITOK_TYPE_SUPPORTED_ACCEPTOR_EXTS, + ITOK_TYPE_SUPPORTED_INITIATOR_EXTS, + GSSEAP_STATE_INITIAL, + 0, + eapGssSmAcceptExts, + }, +#ifdef GSSEAP_DEBUG + { + ITOK_TYPE_VENDOR_INFO, + ITOK_TYPE_NONE, + GSSEAP_STATE_INITIAL, + 0, + eapGssSmAcceptVendorInfo, + }, +#endif + { + ITOK_TYPE_NONE, + ITOK_TYPE_EAP_REQ, + GSSEAP_STATE_INITIAL, + SM_ITOK_FLAG_REQUIRED, + eapGssSmAcceptIdentity, + }, + { + ITOK_TYPE_EAP_RESP, + ITOK_TYPE_EAP_REQ, + GSSEAP_STATE_AUTHENTICATE, + SM_ITOK_FLAG_REQUIRED, + eapGssSmAcceptAuthenticate + }, + { + ITOK_TYPE_GSS_FLAGS, + ITOK_TYPE_NONE, + GSSEAP_STATE_INITIATOR_EXTS, + 0, + eapGssSmAcceptGssFlags + }, + { + ITOK_TYPE_GSS_CHANNEL_BINDINGS, + ITOK_TYPE_NONE, + GSSEAP_STATE_INITIATOR_EXTS, + 0, + eapGssSmAcceptGssChannelBindings, + }, + { + ITOK_TYPE_INITIATOR_MIC, + ITOK_TYPE_NONE, + GSSEAP_STATE_INITIATOR_EXTS, + SM_ITOK_FLAG_REQUIRED, + eapGssSmAcceptInitiatorMIC, + }, #ifdef GSSEAP_ENABLE_REAUTH - { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmAcceptGssReauth }, + { + ITOK_TYPE_NONE, + ITOK_TYPE_REAUTH_CREDS, + GSSEAP_STATE_ACCEPTOR_EXTS, + 0, + eapGssSmAcceptReauthCreds, + }, #endif + { + ITOK_TYPE_NONE, + ITOK_TYPE_ACCEPTOR_MIC, + GSSEAP_STATE_ACCEPTOR_EXTS, + 0, + eapGssSmAcceptAcceptorMIC + }, }; OM_uint32 @@ -658,14 +925,8 @@ gss_accept_sec_context(OM_uint32 *minor, OM_uint32 *time_rec, gss_cred_id_t *delegated_cred_handle) { - OM_uint32 major; - OM_uint32 tmpMajor, tmpMinor; + OM_uint32 major, tmpMinor; gss_ctx_id_t ctx = *context_handle; - struct gss_eap_acceptor_sm *sm = NULL; - gss_buffer_desc innerInputToken = GSS_C_EMPTY_BUFFER; - gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER; - enum gss_eap_token_type tokType; - int initialContextToken = 0; *minor = 0; @@ -685,7 +946,6 @@ gss_accept_sec_context(OM_uint32 *minor, if (GSS_ERROR(major)) return major; - initialContextToken = 1; *context_handle = ctx; } @@ -711,61 +971,36 @@ gss_accept_sec_context(OM_uint32 *minor, GSSEAP_MUTEX_LOCK(&cred->mutex); - sm = &eapGssAcceptorSm[ctx->state]; - - major = gssEapVerifyToken(minor, ctx, input_token, - &tokType, &innerInputToken); - if (GSS_ERROR(major)) - goto cleanup; - - if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) { - *minor = GSSEAP_CRED_MECH_MISMATCH; - major = GSS_S_BAD_MECH; - goto cleanup; + if (cred->name != GSS_C_NO_NAME) { + major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName); + if (GSS_ERROR(major)) + goto cleanup; } -#ifdef GSSEAP_ENABLE_REAUTH - /* - * If we're built with fast reauthentication support, it's valid - * for an initiator to send a GSS reauthentication token as its - * initial context token, causing us to short-circuit the state - * machine and process Kerberos GSS messages instead. - */ - if (tokType == TOK_TYPE_GSS_REAUTH && initialContextToken) { - ctx->state = GSSEAP_STATE_KRB_REAUTH; - } else -#endif - if (tokType != sm->inputTokenType) { - *minor = GSSEAP_WRONG_TOK_ID; - major = GSS_S_DEFECTIVE_TOKEN; + major = gssEapSmStep(minor, + cred, + ctx, + GSS_C_NO_NAME, + GSS_C_NO_OID, + 0, + GSS_C_INDEFINITE, + input_chan_bindings, + input_token, + output_token, + eapGssAcceptorSm, + sizeof(eapGssAcceptorSm) / sizeof(eapGssAcceptorSm[0])); + if (GSS_ERROR(major)) goto cleanup; - } - - do { - sm = &eapGssAcceptorSm[ctx->state]; - major = (sm->processToken)(minor, - ctx, - cred, - &innerInputToken, - input_chan_bindings, - &innerOutputToken); - if (GSS_ERROR(major)) { - /* Possibly generate an error token */ - tmpMajor = makeErrorToken(&tmpMinor, major, *minor, &innerOutputToken); - if (GSS_ERROR(tmpMajor)) { - major = tmpMajor; - goto cleanup; - } + if (mech_type != NULL) { + OM_uint32 tmpMajor; - sm = &eapGssAcceptorSm[GSSEAP_STATE_ERROR]; - goto send_token; + tmpMajor = gssEapCanonicalizeOid(&tmpMinor, ctx->mechanismUsed, 0, mech_type); + if (GSS_ERROR(tmpMajor)) { + major = tmpMajor; + *minor = tmpMinor; + goto cleanup; } - } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0); - - if (mech_type != NULL) { - if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type)) - duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type); } if (ret_flags != NULL) *ret_flags = ctx->gssFlags; @@ -785,18 +1020,7 @@ gss_accept_sec_context(OM_uint32 *minor, } } - assert(ctx->state == GSSEAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED); - -send_token: - if (innerOutputToken.value != NULL) { - tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken, - sm->outputTokenType, output_token); - if (GSS_ERROR(tmpMajor)) { - major = tmpMajor; - *minor = tmpMinor; - goto cleanup; - } - } + assert(CTX_IS_ESTABLISHED(ctx) || major == GSS_S_CONTINUE_NEEDED); cleanup: if (cred != GSS_C_NO_CREDENTIAL) @@ -806,8 +1030,6 @@ cleanup: if (GSS_ERROR(major)) gssEapReleaseContext(&tmpMinor, context_handle); - gss_release_buffer(&tmpMinor, &innerOutputToken); - return major; } @@ -826,42 +1048,60 @@ acceptReadyKrb(OM_uint32 *minor, if (GSS_ERROR(major)) return major; - if (cred->name != GSS_C_NO_NAME) { - major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName); - if (GSS_ERROR(major)) - return major; - } - major = gssEapReauthComplete(minor, ctx, cred, mech, timeRec); if (GSS_ERROR(major)) return major; - ctx->state = GSSEAP_STATE_ESTABLISHED; - *minor = 0; return GSS_S_COMPLETE; } static OM_uint32 eapGssSmAcceptGssReauth(OM_uint32 *minor, - gss_ctx_id_t ctx, gss_cred_id_t cred, + gss_ctx_id_t ctx, + gss_name_t target GSSEAP_UNUSED, + gss_OID mech, + OM_uint32 reqFlags GSSEAP_UNUSED, + OM_uint32 timeReq GSSEAP_UNUSED, + gss_channel_bindings_t userChanBindings, gss_buffer_t inputToken, - gss_channel_bindings_t chanBindings, - gss_buffer_t outputToken) + gss_buffer_t outputToken, + OM_uint32 *smFlags) { OM_uint32 major, tmpMinor; gss_name_t krbInitiator = GSS_C_NO_NAME; - gss_OID mech = GSS_C_NO_OID; OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE; + struct gss_channel_bindings_struct wireChanBindings = { 0 }; + + /* + * If we're built with fast reauthentication support, it's valid + * for an initiator to send a GSS reauthentication token as its + * initial context token, causing us to short-circuit the state + * machine and process Kerberos GSS messages instead. + */ ctx->flags |= CTX_FLAG_KRB_REAUTH; + /* + * To avoid an additional round trip, we use GSS channel bindings + * to integrity protect the rest of the initiator exchange. This + * does have the disadvantage of making it impossible for the + * acceptor to ignore application channel bindings, behaviour + * which differs from normal Kerberos and GSS-EAP itself. + */ + major = gssEapMakeTokenChannelBindings(minor, ctx, + userChanBindings, + inputToken, + &wireChanBindings); + if (GSS_ERROR(major)) + return major; + major = gssAcceptSecContext(minor, &ctx->kerberosCtx, cred->krbCred, inputToken, - chanBindings, + &wireChanBindings, &krbInitiator, &mech, outputToken, @@ -871,11 +1111,25 @@ eapGssSmAcceptGssReauth(OM_uint32 *minor, if (major == GSS_S_COMPLETE) { major = acceptReadyKrb(minor, ctx, cred, krbInitiator, mech, timeRec); + if (major == GSS_S_COMPLETE) { + /* Generate acceptor MIC */ + GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_ACCEPTOR_EXTS); + } + ctx->gssFlags = gssFlags; + } else if (GSS_ERROR(major) && + (*smFlags & SM_FLAG_INPUT_TOKEN_CRITICAL) == 0) { + /* Fall back to EAP */ + gssDeleteSecContext(&tmpMinor, &ctx->kerberosCtx, GSS_C_NO_BUFFER); + ctx->flags &= ~(CTX_FLAG_KRB_REAUTH); + GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_INITIAL); + } else { + GSSEAP_SM_TRANSITION(ctx, GSSEAP_STATE_REAUTHENTICATE); } - ctx->gssFlags = gssFlags; + major = GSS_S_CONTINUE_NEEDED; gssReleaseName(&tmpMinor, &krbInitiator); + gss_release_buffer(&tmpMinor, &wireChanBindings.application_data); return major; }