#include "gssapiP_eap.h"
+#ifdef GSSEAP_ENABLE_REAUTH
+static int
+canReauthP(gss_cred_id_t cred);
+
+static OM_uint32
+eapGssSmInitGssReauth(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);
+#endif
+
static OM_uint32
policyVariableToFlag(enum eapol_bool_var variable)
{
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)
+ gss_ctx_id_t ctx)
{
krb5_context krbContext;
struct eap_peer_config *eapPeerConfig = &ctx->initiatorCtx.eapPeerConfig;
krb5_error_code code;
char *identity;
+ eapPeerConfig->identity = NULL;
+ eapPeerConfig->identity_len = 0;
+ eapPeerConfig->password = NULL;
+ eapPeerConfig->password_len = 0;
+
+ assert(cred != GSS_C_NO_CREDENTIAL);
+
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) {
}
static OM_uint32
-peerDeriveKey(OM_uint32 *minor,
- gss_ctx_id_t ctx)
+initReady(OM_uint32 *minor, gss_ctx_id_t ctx)
{
OM_uint32 major;
const unsigned char *key;
size_t keyLength;
- krb5_context krbContext;
-
- GSSEAP_KRB_INIT(&krbContext);
+ krb5_enctype encryptionType;
+ int gotKey = 0;
/* Cache encryption type derived from selected mechanism OID */
- major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &ctx->encryptionType);
+ major = gssEapOidToEnctype(minor, ctx->mechanismUsed, &encryptionType);
if (GSS_ERROR(major))
return major;
- if (ctx->encryptionType != ENCTYPE_NULL &&
+ if (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;
+ if (keyLength >= EAP_EMSK_LEN) {
+ major = gssEapDeriveRfc3961Key(minor,
+ &key[EAP_EMSK_LEN / 2],
+ EAP_EMSK_LEN / 2,
+ encryptionType,
+ &ctx->rfc3961Key);
+ if (GSS_ERROR(major))
+ return major;
+
+ major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
+ &ctx->checksumType);
+ if (GSS_ERROR(major))
+ return major;
+ gotKey++;
+ }
+ }
+
+ if (gotKey) {
+ ctx->encryptionType = encryptionType;
} else {
/*
* draft-howlett-eap-gss says that integrity/confidentialty should
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
+initBegin(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;
+
+ assert(cred != GSS_C_NO_CREDENTIAL);
+
+ if (cred->expiryTime)
+ ctx->expiryTime = cred->expiryTime;
+ else if (timeReq == 0 || timeReq == GSS_C_INDEFINITE)
+ ctx->expiryTime = 0;
+ else
+ ctx->expiryTime = time(NULL) + timeReq;
+
+ major = gssEapDuplicateName(minor, cred->name, &ctx->initiatorName);
+ if (GSS_ERROR(major))
+ return major;
+
+ major = gssEapDuplicateName(minor, target, &ctx->acceptorName);
+ if (GSS_ERROR(major))
+ return major;
+
+ 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))
+ return major;
+
+ /* If credentials were provided, check they're usable with this mech */
+ if (!gssEapCredAvailable(cred, ctx->mechanismUsed))
+ return GSS_S_BAD_MECH;
+
return GSS_S_COMPLETE;
}
static OM_uint32
+eapGssSmInitIdentity(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;
+ int initialContextToken;
+
+ initialContextToken = (inputToken->length == 0);
+ if (!initialContextToken)
+ return GSS_S_DEFECTIVE_TOKEN;
+
+ major = initBegin(minor, cred, ctx, target, mech,
+ reqFlags, timeReq, chanBindings,
+ inputToken, outputToken);
+ if (GSS_ERROR(major))
+ return major;
+
+ ctx->state = EAP_STATE_AUTHENTICATE;
+
+ return GSS_S_CONTINUE_NEEDED;
+}
+
+static struct wpabuf emptyWpaBuffer;
+
+static OM_uint32
eapGssSmInitAuthenticate(OM_uint32 *minor,
gss_cred_id_t cred,
gss_ctx_id_t ctx,
gss_buffer_t inputToken,
gss_buffer_t outputToken)
{
- OM_uint32 major, tmpMinor;
- time_t now;
- int initialContextToken = 0, code;
+ OM_uint32 major;
+ OM_uint32 tmpMinor;
+ int code;
+ struct wpabuf *resp = NULL;
+ int initialContextToken;
initialContextToken = (inputToken == GSS_C_NO_BUFFER ||
inputToken->length == 0);
- major = peerConfigInit(minor, cred, ctx, initialContextToken);
+ major = peerConfigInit(minor, cred, ctx);
if (GSS_ERROR(major))
goto cleanup;
- if (initialContextToken) {
- ctx->flags |= CTX_FLAG_EAP_PORT_ENABLED;
+ if (ctx->initiatorCtx.eap == NULL) {
+ struct eap_config eapConfig;
+
+ memset(&eapConfig, 0, sizeof(eapConfig));
ctx->initiatorCtx.eap = eap_peer_sm_init(ctx,
&gssEapPolicyCallbacks,
ctx,
- &ctx->initiatorCtx.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))
+ &eapConfig);
+ if (ctx->initiatorCtx.eap == NULL) {
+ major = GSS_S_FAILURE;
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;
+
+ ctx->flags |= CTX_FLAG_EAP_RESTART | CTX_FLAG_EAP_PORT_ENABLED;
}
+ ctx->flags |= CTX_FLAG_EAP_REQ; /* we have a Request from the acceptor */
+
wpabuf_set(&ctx->initiatorCtx.reqData,
inputToken->value, inputToken->length);
- code = eap_peer_sm_step(ctx->initiatorCtx.eap);
+ major = GSS_S_CONTINUE_NEEDED;
+ code = eap_peer_sm_step(ctx->initiatorCtx.eap);
if (ctx->flags & CTX_FLAG_EAP_RESP) {
- struct wpabuf *resp;
- gss_buffer_desc buf;
-
ctx->flags &= ~(CTX_FLAG_EAP_RESP);
resp = eap_get_eapRespData(ctx->initiatorCtx.eap);
-
- if (resp != NULL) {
- buf.length = wpabuf_len(resp);
- buf.value = (void *)wpabuf_head(resp);
-
- major = duplicateBuffer(minor, &buf, outputToken);
- if (GSS_ERROR(major))
- goto cleanup;
-
- major = GSS_S_CONTINUE_NEEDED;
- }
- }
-
- if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
- major = peerDeriveKey(minor, ctx);
+ } else if (ctx->flags & CTX_FLAG_EAP_SUCCESS) {
+ major = initReady(minor, ctx);
if (GSS_ERROR(major))
goto cleanup;
ctx->flags &= ~(CTX_FLAG_EAP_SUCCESS);
- ctx->state = EAP_STATE_ESTABLISHED;
- major = GSS_S_COMPLETE;
- } else if (code == 0) {
- major = GSS_S_FAILURE;
+ major = GSS_S_CONTINUE_NEEDED;
+ ctx->state = EAP_STATE_EXTENSIONS_REQ;
+ } else if (ctx->flags & CTX_FLAG_EAP_FAIL) {
+ major = GSS_S_DEFECTIVE_CREDENTIAL;
+ } else if (code == 0 && initialContextToken) {
+ resp = &emptyWpaBuffer;
+ major = GSS_S_CONTINUE_NEEDED;
+ } else {
+ major = GSS_S_DEFECTIVE_TOKEN;
}
cleanup:
+ if (resp != NULL) {
+ OM_uint32 tmpMajor;
+ gss_buffer_desc respBuf;
+
+ assert(major == GSS_S_CONTINUE_NEEDED);
+
+ respBuf.length = wpabuf_len(resp);
+ respBuf.value = (void *)wpabuf_head(resp);
+
+ tmpMajor = duplicateBuffer(&tmpMinor, &respBuf, outputToken);
+ if (GSS_ERROR(tmpMajor)) {
+ major = tmpMajor;
+ *minor = tmpMinor;
+ }
+ }
+
wpabuf_set(&ctx->initiatorCtx.reqData, NULL, 0);
peerConfigFree(&tmpMinor, ctx);
}
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)
+initGssChannelBindings(OM_uint32 *minor,
+ gss_ctx_id_t ctx,
+ gss_channel_bindings_t chanBindings,
+ gss_buffer_t outputToken)
{
- GSSEAP_NOT_IMPLEMENTED;
+ OM_uint32 major;
+ gss_buffer_desc buffer = GSS_C_EMPTY_BUFFER;
+
+
+ if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
+ buffer = chanBindings->application_data;
+
+ major = gssEapWrap(minor, ctx, TRUE, GSS_C_QOP_DEFAULT,
+ &buffer, NULL, outputToken);
+ if (GSS_ERROR(major))
+ return major;
+
+ return GSS_S_CONTINUE_NEEDED;
}
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)
+eapGssSmInitExtensionsReq(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;
+ OM_uint32 major, tmpMinor;
+ gss_buffer_desc cbToken = GSS_C_EMPTY_BUFFER;
+
+ major = initGssChannelBindings(minor, ctx, chanBindings, &cbToken);
+ if (GSS_ERROR(major))
+ return major;
+
+ ctx->state = EAP_STATE_EXTENSIONS_RESP;
+
+ major = duplicateBuffer(minor, &cbToken, outputToken);
+ if (GSS_ERROR(major)) {
+ gss_release_buffer(&tmpMinor, &cbToken);
+ return major;
+ }
+
+ gss_release_buffer(&tmpMinor, &cbToken);
+
+ return GSS_S_CONTINUE_NEEDED;
}
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)
+eapGssSmInitExtensionsResp(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;
+#ifdef GSSEAP_ENABLE_REAUTH
+ OM_uint32 major;
+
+ major = gssEapStoreReauthCreds(minor, ctx, cred, inputToken);
+ if (GSS_ERROR(major))
+ return major;
+#endif
+
+ ctx->state = EAP_STATE_ESTABLISHED;
+
+ return GSS_S_COMPLETE;
}
static OM_uint32
return GSS_S_BAD_STATUS;
}
-static struct eap_gss_initiator_sm {
+static struct gss_eap_initiator_sm {
enum gss_eap_token_type inputTokenType;
enum gss_eap_token_type outputTokenType;
OM_uint32 (*processToken)(OM_uint32 *,
gss_buffer_t,
gss_buffer_t);
} eapGssInitiatorSm[] = {
- { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitAuthenticate },
- { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitKeyTransport },
- { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitSecureAssoc },
- { TOK_TYPE_GSS_CB, TOK_TYPE_NONE, eapGssSmInitGssChannelBindings },
- { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmInitEstablished },
+ { TOK_TYPE_NONE, TOK_TYPE_EAP_RESP, eapGssSmInitIdentity },
+ { TOK_TYPE_EAP_REQ, TOK_TYPE_EAP_RESP, eapGssSmInitAuthenticate },
+ { TOK_TYPE_NONE, TOK_TYPE_EXT_REQ, eapGssSmInitExtensionsReq },
+ { TOK_TYPE_EXT_RESP,TOK_TYPE_NONE, eapGssSmInitExtensionsResp },
+ { TOK_TYPE_NONE, TOK_TYPE_NONE, eapGssSmInitEstablished },
+#ifdef GSSEAP_ENABLE_REAUTH
+ { TOK_TYPE_GSS_REAUTH, TOK_TYPE_GSS_REAUTH, eapGssSmInitGssReauth },
+#endif
};
OM_uint32
OM_uint32 *ret_flags,
OM_uint32 *time_rec)
{
- OM_uint32 major, tmpMinor;
+ OM_uint32 major;
+ OM_uint32 tmpMajor, tmpMinor;
gss_ctx_id_t ctx = *context_handle;
- struct eap_gss_initiator_sm *sm = NULL;
- gss_buffer_desc innerInputToken, innerOutputToken;
+ struct gss_eap_initiator_sm *sm = NULL;
+ gss_buffer_desc innerInputToken;
+ gss_buffer_desc innerOutputToken = GSS_C_EMPTY_BUFFER;
+ enum gss_eap_token_type tokType;
+ gss_cred_id_t defaultCred = GSS_C_NO_CREDENTIAL;
*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 (cred != GSS_C_NO_CREDENTIAL) {
+ if ((cred->flags & CRED_FLAG_INITIATE) == 0) {
+ major = GSS_S_NO_CRED;
+ goto cleanup;
+ }
+ } else {
+ /* XXX TODO should we store this in the context handle? */
+ major = gssEapAcquireCred(minor, GSS_C_NO_NAME, GSS_C_NO_BUFFER,
+ time_req, GSS_C_NO_OID_SET, GSS_C_INITIATE,
+ &defaultCred, NULL, NULL);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ cred = defaultCred;
}
if (ctx == GSS_C_NO_CONTEXT) {
major = gssEapAllocContext(minor, &ctx);
if (GSS_ERROR(major))
- return major;
+ goto cleanup;
ctx->flags |= CTX_FLAG_INITIATOR;
+#ifdef GSSEAP_ENABLE_REAUTH
+ if (canReauthP(cred))
+ ctx->state = EAP_STATE_KRB_REAUTH_GSS;
+#endif
+
*context_handle = ctx;
}
if (input_token != GSS_C_NO_BUFFER) {
major = gssEapVerifyToken(minor, ctx, input_token,
- sm->inputTokenType, &innerInputToken);
+ &tokType, &innerInputToken);
if (GSS_ERROR(major))
goto cleanup;
+
+ if (tokType != sm->inputTokenType) {
+ major = GSS_S_DEFECTIVE_TOKEN;
+ goto cleanup;
+ }
} else {
innerInputToken.length = 0;
innerInputToken.value = NULL;
* the status is not GSS_S_COMPLETE or an error status.
*/
do {
+ sm = &eapGssInitiatorSm[ctx->state];
+
major = (sm->processToken)(minor,
cred,
ctx,
&innerOutputToken);
if (GSS_ERROR(major))
goto cleanup;
- } while (major == GSS_S_CONTINUE_NEEDED && innerOutputToken.length == 0);
+ } 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.length != 0) {
- major = gssEapMakeToken(minor, ctx, &innerOutputToken,
- sm->outputTokenType, output_token);
- if (GSS_ERROR(major))
+ 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);
+ gssEapContextTime(&tmpMinor, ctx, time_rec);
assert(ctx->state == EAP_STATE_ESTABLISHED || major == GSS_S_CONTINUE_NEEDED);
gssEapReleaseContext(&tmpMinor, context_handle);
gss_release_buffer(&tmpMinor, &innerOutputToken);
+ gssEapReleaseCred(&tmpMinor, &defaultCred);
+
+ return major;
+}
+
+#ifdef GSSEAP_ENABLE_REAUTH
+static int
+canReauthP(gss_cred_id_t cred)
+{
+ return (cred != GSS_C_NO_CREDENTIAL &&
+ cred->krbCred != GSS_C_NO_CREDENTIAL &&
+ cred->expiryTime > time(NULL));
+}
+
+static OM_uint32
+eapGssSmInitGssReauth(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_name_t mechTarget = GSS_C_NO_NAME;
+ gss_OID actualMech = GSS_C_NO_OID;
+ OM_uint32 gssFlags, timeRec;
+
+ assert(cred != GSS_C_NO_CREDENTIAL);
+
+ ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
+
+ if (inputToken->length == 0) {
+ major = initBegin(minor, cred, ctx, target, mech,
+ reqFlags, timeReq, chanBindings,
+ inputToken, outputToken);
+ if (GSS_ERROR(major))
+ goto cleanup;
+ }
+
+ major = gssEapMechToGlueName(minor, target, &mechTarget);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ major = gssInitSecContext(minor,
+ cred->krbCred,
+ &ctx->kerberosCtx,
+ mechTarget,
+ (gss_OID)gss_mech_krb5,
+ reqFlags, /* | GSS_C_DCE_STYLE, */
+ timeReq,
+ chanBindings,
+ inputToken,
+ &actualMech,
+ outputToken,
+ &gssFlags,
+ &timeRec);
+ if (GSS_ERROR(major))
+ goto cleanup;
+
+ ctx->gssFlags = gssFlags;
+
+ if (major == GSS_S_COMPLETE) {
+ major = gssEapReauthComplete(minor, ctx, cred, actualMech, timeRec);
+ if (GSS_ERROR(major))
+ goto cleanup;
+ ctx->state = EAP_STATE_ESTABLISHED;
+ }
+
+cleanup:
+ gssReleaseName(&tmpMinor, &mechTarget);
return major;
}
+#endif /* GSSEAP_ENABLE_REAUTH */
projects / mech_eap.git / blobdiff