Better error reporting through com_err
[mech_eap.git] / accept_sec_context.c
index 42c29c2..c68548f 100644 (file)
 
 #include "gssapiP_eap.h"
 
+#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_channel_bindings_t chanBindings,
+                        gss_buffer_t outputToken);
+#endif
+
 /*
  * Mark a context as ready for cryptographic operations
  */
 static OM_uint32
-acceptReady(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
+acceptReadyEap(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
 {
-    OM_uint32 major;
+    OM_uint32 major, tmpMinor;
     VALUE_PAIR *vp;
     gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
 
@@ -48,48 +58,41 @@ acceptReady(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
     if (GSS_ERROR(major))
         return major;
 
-    vp = rc_avpair_get(ctx->acceptorCtx.avps, PW_USER_NAME, 0);
-    if (vp != NULL) {
-        nameBuf.length = vp->lvalue;
-        nameBuf.value = vp->strvalue;
-    } else if (ctx->initiatorName == GSS_C_NO_NAME) {
+    gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
+
+    major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
+                                  PW_USER_NAME, 0, &vp);
+    if (major == GSS_S_COMPLETE) {
+        nameBuf.length = vp->length;
+        nameBuf.value = vp->vp_strvalue;
+    } else {
         ctx->gssFlags |= GSS_C_ANON_FLAG;
     }
 
-    if (nameBuf.length != 0 || ctx->initiatorName == GSS_C_NO_NAME) {
-        major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
-                                 &ctx->initiatorName);
-        if (GSS_ERROR(major))
-            return major;
-    }
+    major = gssEapImportName(minor, &nameBuf, GSS_C_NT_USER_NAME,
+                             &ctx->initiatorName);
+    if (GSS_ERROR(major))
+        return major;
 
-    ctx->initiatorName->attrCtx = gssEapCreateAttrContext(cred, ctx);
+    major = gssEapRadiusGetRawAvp(minor, ctx->acceptorCtx.vps,
+                                  PW_MS_MPPE_SEND_KEY, VENDORPEC_MS, &vp);
+    if (GSS_ERROR(major)) {
+        *minor = GSSEAP_KEY_UNAVAILABLE;
+        return GSS_S_UNAVAILABLE;
+    }
 
-    vp = rc_avpair_get(ctx->acceptorCtx.avps,
-                       RADIUS_VENDOR_ATTR_MS_MPPE_SEND_KEY,
-                       RADIUS_VENDOR_ID_MICROSOFT);
-    if (ctx->encryptionType != ENCTYPE_NULL && vp != NULL) {
-        major = gssEapDeriveRfc3961Key(minor,
-                                       (unsigned char *)vp->strvalue,
-                                       vp->lvalue,
-                                       ctx->encryptionType,
-                                       &ctx->rfc3961Key);
-        if (GSS_ERROR(major))
-            return major;
+    major = gssEapDeriveRfc3961Key(minor,
+                                   vp->vp_octets,
+                                   vp->length,
+                                   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);
-        ctx->encryptionType = ENCTYPE_NULL;
-    }
+    major = rfc3961ChecksumTypeForKey(minor, &ctx->rfc3961Key,
+                                       &ctx->checksumType);
+    if (GSS_ERROR(major))
+        return major;
 
     major = sequenceInit(minor,
                          &ctx->seqState, ctx->recvSeq,
@@ -99,6 +102,8 @@ acceptReady(OM_uint32 *minor, gss_ctx_id_t ctx, gss_cred_id_t cred)
     if (GSS_ERROR(major))
         return major;
 
+    ctx->initiatorName->attrCtx = gssEapCreateAttrContext(cred, ctx);
+
     return GSS_S_COMPLETE;
 }
 
@@ -120,16 +125,10 @@ eapGssSmAcceptIdentity(OM_uint32 *minor,
     if (inputToken != GSS_C_NO_BUFFER && inputToken->length != 0)
         return GSS_S_DEFECTIVE_TOKEN;
 
-    assert(ctx->acceptorCtx.radHandle == NULL);
+    assert(ctx->acceptorName == GSS_C_NO_NAME);
 
-    major = gssEapRadiusAllocHandle(minor, cred, &ctx->acceptorCtx.radHandle);
-    if (GSS_ERROR(major))
-        return major;
-
-    if (ctx->acceptorName == GSS_C_NO_NAME &&
-        cred != GSS_C_NO_CREDENTIAL &&
-        cred->name != GSS_C_NO_NAME) {
-        major = gss_duplicate_name(minor, cred->name, &ctx->acceptorName);
+    if (cred != GSS_C_NO_CREDENTIAL && cred->name != GSS_C_NO_NAME) {
+        major = gssEapDuplicateName(minor, cred->name, &ctx->acceptorName);
         if (GSS_ERROR(major))
             return major;
     }
@@ -152,30 +151,150 @@ eapGssSmAcceptIdentity(OM_uint32 *minor,
 }
 
 static OM_uint32
-importInitiatorIdentity(OM_uint32 *minor,
-                        gss_ctx_id_t ctx,
-                        gss_buffer_t inputToken,
-                        gss_buffer_t nameBuf)
+setAcceptorIdentity(OM_uint32 *minor,
+                    gss_ctx_id_t ctx,
+                    VALUE_PAIR **vps)
 {
-    OM_uint32 major, tmpMinor;
-    struct eap_hdr *pdu = (struct eap_hdr *)inputToken->value;
-    unsigned char *pos = (unsigned char *)(pdu + 1);
-    gss_name_t name;
+    OM_uint32 major;
+    gss_buffer_desc nameBuf;
+    krb5_context krbContext = NULL;
+    krb5_principal krbPrinc;
+    struct rs_handle *rh = ctx->acceptorCtx.radHandle;
+
+    assert(rh != NULL);
+
+    /* Awaits further specification */
+    if (ctx->acceptorName == GSS_C_NO_NAME)
+        return GSS_S_COMPLETE;
+
+    GSSEAP_KRB_INIT(&krbContext);
+
+    krbPrinc = ctx->acceptorName->krbPrincipal;
+    assert(krbPrinc != NULL);
 
-    assert(pdu->code == EAP_CODE_RESPONSE);
-    assert(pos[0] == EAP_TYPE_IDENTITY);
+    if (krb5_princ_size(krbContext, krbPrinc) < 2)
+        return GSS_S_BAD_NAME;
 
-    nameBuf->value = pos + 1;
-    nameBuf->length = inputToken->length - sizeof(*pdu) - 1;
+    /* Acceptor-Service-Name */
+    krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 0), &nameBuf);
 
-    major = gssEapImportName(minor, nameBuf, GSS_C_NT_USER_NAME, &name);
+    major = gssEapRadiusAddAvp(minor, vps,
+                               PW_GSS_ACCEPTOR_SERVICE_NAME,
+                               VENDORPEC_UKERNA,
+                               &nameBuf);
     if (GSS_ERROR(major))
         return major;
 
-    gssEapReleaseName(&tmpMinor, &ctx->initiatorName);
-    ctx->initiatorName = name;
+    /* Acceptor-Host-Name */
+    krbDataToGssBuffer(krb5_princ_component(krbContext, krbPrinc, 1), &nameBuf);
+
+    major = gssEapRadiusAddAvp(minor, vps,
+                               PW_GSS_ACCEPTOR_HOST_NAME,
+                               VENDORPEC_UKERNA,
+                               &nameBuf);
+    if (GSS_ERROR(major))
+        return major;
+
+    if (krb5_princ_size(krbContext, krbPrinc) > 2) {
+        /* Acceptor-Service-Specific */
+        krb5_principal_data ssiPrinc = *krbPrinc;
+        char *ssi;
+
+        krb5_princ_size(krbContext, &ssiPrinc) -= 2;
+        krb5_princ_name(krbContext, &ssiPrinc) += 2;
+
+        *minor = krb5_unparse_name_flags(krbContext, &ssiPrinc,
+                                         KRB5_PRINCIPAL_UNPARSE_NO_REALM, &ssi);
+        if (*minor != 0)
+            return GSS_S_FAILURE;
+
+        nameBuf.value = ssi;
+        nameBuf.length = strlen(ssi);
+
+        major = gssEapRadiusAddAvp(minor, vps,
+                                   PW_GSS_ACCEPTOR_SERVICE_SPECIFIC,
+                                   VENDORPEC_UKERNA,
+                                   &nameBuf);
+
+        if (GSS_ERROR(major)) {
+            krb5_free_unparsed_name(krbContext, ssi);
+            return major;
+        }
+        krb5_free_unparsed_name(krbContext, ssi);
+    }
+
+    krbDataToGssBuffer(krb5_princ_realm(krbContext, krbPrinc), &nameBuf);
+    if (nameBuf.length != 0) {
+        /* Acceptor-Realm-Name */
+        major = gssEapRadiusAddAvp(minor, vps,
+                                   PW_GSS_ACCEPTOR_REALM_NAME,
+                                   VENDORPEC_UKERNA,
+                                   &nameBuf);
+        if (GSS_ERROR(major))
+            return major;
+    }
+
+    return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+createRadiusHandle(OM_uint32 *minor,
+                   gss_cred_id_t cred,
+                   gss_ctx_id_t ctx)
+{
+    struct gss_eap_acceptor_ctx *actx = &ctx->acceptorCtx;
+    const char *configFile = RS_CONFIG_FILE;
+    const char *configStanza = "gss-eap";
+    struct rs_alloc_scheme ralloc;
+    struct rs_error *err;
+
+    assert(actx->radHandle == NULL);
+    assert(actx->radConn == NULL);
+
+    if (rs_context_create(&actx->radHandle, RS_DICT_FILE) != 0) {
+        *minor = GSSEAP_RADSEC_INIT_FAILURE;
+        return GSS_S_FAILURE;
+    }
+
+    if (cred != GSS_C_NO_CREDENTIAL) {
+        if (cred->radiusConfigFile != NULL)
+            configFile = cred->radiusConfigFile;
+        if (cred->radiusConfigStanza != NULL)
+            configStanza = cred->radiusConfigStanza;
+    }
+
+    ralloc.calloc  = GSSEAP_CALLOC;
+    ralloc.malloc  = GSSEAP_MALLOC;
+    ralloc.free    = GSSEAP_FREE;
+    ralloc.realloc = GSSEAP_REALLOC;
+
+    rs_context_set_alloc_scheme(actx->radHandle, &ralloc);
+
+    if (rs_context_read_config(actx->radHandle, configFile) != 0) {
+        err = rs_err_ctx_pop(actx->radHandle);
+        goto fail;
+    }
+
+    if (rs_conn_create(actx->radHandle, &actx->radConn, configStanza) != 0) {
+        err = rs_err_conn_pop(actx->radConn);
+        goto fail;
+    }
 
+    /* XXX TODO rs_conn_select_server does not exist yet */
+#if 0
+    if (actx->radServer != NULL) {
+        if (rs_conn_select_server(actx->radConn, actx->radServer) != 0) {
+            err = rs_err_conn_pop(actx->radConn);
+            goto fail;
+        }
+    }
+#endif
+
+    *minor = 0;
     return GSS_S_COMPLETE;
+
+fail:
+    return gssEapRadiusMapError(minor, err);
 }
 
 static OM_uint32
@@ -187,147 +306,147 @@ eapGssSmAcceptAuthenticate(OM_uint32 *minor,
                            gss_buffer_t outputToken)
 {
     OM_uint32 major, tmpMinor;
-    int code;
-    VALUE_PAIR *send = NULL;
-    VALUE_PAIR *received = NULL;
-    rc_handle *rh = ctx->acceptorCtx.radHandle;
-    char msgBuffer[4096];
-    struct eap_hdr *pdu;
-    unsigned char *pos;
-    gss_buffer_desc nameBuf = GSS_C_EMPTY_BUFFER;
-
-    pdu = (struct eap_hdr *)inputToken->value;
-    pos = (unsigned char *)(pdu + 1);
-
-    if (inputToken->length > sizeof(*pdu) &&
-        pdu->code == EAP_CODE_RESPONSE &&
-        pos[0] == EAP_TYPE_IDENTITY) {
-        major = importInitiatorIdentity(minor, ctx, inputToken, &nameBuf);
+    struct rs_handle *rh;
+    struct rs_connection *rconn;
+    struct rs_request *request = NULL;
+    struct rs_packet *req = NULL, *resp = NULL;
+    struct radius_packet *frreq, *frresp;
+    int sendAcceptorIdentity = 0;
+
+    if (ctx->acceptorCtx.radHandle == NULL) {
+        /* May be NULL from an imported partial context */
+        major = createRadiusHandle(minor, cred, ctx);
         if (GSS_ERROR(major))
             goto cleanup;
 
-        major = addAvpFromBuffer(minor, rh, &send, PW_USER_NAME, &nameBuf);
+        sendAcceptorIdentity = 1;
+    }
+
+    rh = ctx->acceptorCtx.radHandle;
+    rconn = ctx->acceptorCtx.radConn;
+
+    if (rs_packet_create_acc_request(rconn, &req, NULL, NULL) != 0) {
+        major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
+        goto cleanup;
+    }
+    frreq = rs_packet_frpkt(req);
+
+    if (sendAcceptorIdentity) {
+        major = setAcceptorIdentity(minor, ctx, &frreq->vps);
         if (GSS_ERROR(major))
             goto cleanup;
     }
 
-    major = addAvpFromBuffer(minor, rh, &send, PW_EAP_MESSAGE, inputToken);
+    major = gssEapRadiusAddAvp(minor, &frreq->vps,
+                               PW_EAP_MESSAGE, 0, inputToken);
     if (GSS_ERROR(major))
         goto cleanup;
 
-    if (ctx->acceptorCtx.lastStatus == CHALLENGE_RC) {
-        major = addAvpFromBuffer(minor, rh, &send, PW_STATE,
-                                 &ctx->acceptorCtx.state);
+    if (ctx->acceptorCtx.state.length != 0) {
+        major = gssEapRadiusAddAvp(minor, &frreq->vps, PW_STATE, 0,
+                                   &ctx->acceptorCtx.state);
         if (GSS_ERROR(major))
             goto cleanup;
 
         gss_release_buffer(&tmpMinor, &ctx->acceptorCtx.state);
     }
 
-    code = rc_auth(rh, 0, send, &received, msgBuffer);
-    switch (code) {
-    case OK_RC:
-    case CHALLENGE_RC:
+    if (rs_request_create(rconn, &request) != 0 ||
+        rs_request_send(request, req, &resp) != 0) {
+        major = gssEapRadiusMapError(minor, rs_err_conn_pop(rconn));
+        goto cleanup;
+    }
+
+    assert(resp != NULL);
+
+    frresp = rs_packet_frpkt(resp);
+    switch (frresp->code) {
+    case PW_AUTHENTICATION_ACK:
+    case PW_ACCESS_CHALLENGE:
         major = GSS_S_CONTINUE_NEEDED;
         break;
-    case TIMEOUT_RC:
-        major = GSS_S_UNAVAILABLE;
-        break;
-    case REJECT_RC:
+    case PW_AUTHENTICATION_REJECT:
         major = GSS_S_DEFECTIVE_CREDENTIAL;
+        goto cleanup;
         break;
     default:
         major = GSS_S_FAILURE;
         goto cleanup;
+        break;
     }
 
-    if (GSS_ERROR(major))
-        goto cleanup;
-
-    ctx->acceptorCtx.lastStatus = code;
-
-    major = getBufferFromAvps(minor, received, PW_EAP_MESSAGE,
-                              outputToken, TRUE);
-    if ((major == GSS_S_UNAVAILABLE && code != OK_RC) ||
+    major = gssEapRadiusGetAvp(minor, frresp->vps, PW_EAP_MESSAGE, 0,
+                               outputToken, TRUE);
+    if ((major == GSS_S_UNAVAILABLE && frresp->code != PW_AUTHENTICATION_ACK) ||
         GSS_ERROR(major))
         goto cleanup;
 
-    if (code == CHALLENGE_RC) {
-        major = getBufferFromAvps(minor, received, PW_STATE,
-                                  &ctx->acceptorCtx.state, TRUE);
+    if (frresp->code == PW_ACCESS_CHALLENGE) {
+        major = gssEapRadiusGetAvp(minor, frresp->vps, PW_STATE, 0,
+                                   &ctx->acceptorCtx.state, TRUE);
         if (major != GSS_S_UNAVAILABLE && GSS_ERROR(major))
             goto cleanup;
     } else {
-        ctx->acceptorCtx.avps = received;
-        received = NULL;
+        ctx->acceptorCtx.vps = frresp->vps;
+        frresp->vps = NULL;
+
+        rs_conn_destroy(ctx->acceptorCtx.radConn);
+        ctx->acceptorCtx.radConn = NULL;
 
-        major = acceptReady(minor, ctx, cred);
+        major = acceptReadyEap(minor, ctx, cred);
         if (GSS_ERROR(major))
             goto cleanup;
 
-        ctx->state = EAP_STATE_GSS_CHANNEL_BINDINGS;
+        ctx->state = EAP_STATE_EXTENSIONS_REQ;
     }
 
     major = GSS_S_CONTINUE_NEEDED;
 
 cleanup:
-    if (received != NULL)
-        rc_avpair_free(received);
+    rs_request_destroy(request);
 
     return major;
 }
 
 static OM_uint32
-eapGssSmAcceptGssChannelBindings(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)
+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)
 {
     OM_uint32 major;
-    gss_iov_buffer_desc iov[2];
+
+    major = gssEapVerifyExtensions(minor, cred, ctx, chanBindings, inputToken);
+    if (GSS_ERROR(major))
+        return major;
 
     outputToken->length = 0;
     outputToken->value = NULL;
 
-    if (chanBindings == GSS_C_NO_CHANNEL_BINDINGS) {
-        ctx->state = EAP_STATE_ESTABLISHED;
-        return GSS_S_COMPLETE;
-    }
-
-    if (inputToken->length < 14) {
-        return GSS_S_DEFECTIVE_TOKEN;
-    }
-
-    iov[0].type = GSS_IOV_BUFFER_TYPE_DATA;
-    iov[0].buffer.length = 0;
-    iov[0].buffer.value = NULL;
+    ctx->state = EAP_STATE_EXTENSIONS_RESP;
 
-    if (chanBindings != GSS_C_NO_CHANNEL_BINDINGS)
-        iov[0].buffer = chanBindings->application_data;
-
-    iov[1].type = GSS_IOV_BUFFER_TYPE_HEADER;
-    iov[1].buffer.length = 16;
-    iov[1].buffer.value = (unsigned char *)inputToken->value - 2;
-
-    assert(load_uint16_be(iov[1].buffer.value) == TOK_TYPE_GSS_CB);
+    return GSS_S_CONTINUE_NEEDED;
+}
 
-    iov[2].type = GSS_IOV_BUFFER_TYPE_TRAILER;
-    iov[2].buffer.length = inputToken->length - 14;
-    iov[2].buffer.value = (unsigned char *)inputToken->value + 14;
+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)
+{
+    OM_uint32 major;
 
-    major = gssEapUnwrapOrVerifyMIC(minor, ctx, NULL, NULL,
-                                    iov, 3, TOK_TYPE_GSS_CB);
-    if (major == GSS_S_COMPLETE) {
-        ctx->state = EAP_STATE_ESTABLISHED;
-    }
+    major = gssEapMakeExtensions(minor, cred, ctx, chanBindings, outputToken);
+    if (GSS_ERROR(major))
+        return major;
 
-#if 0
-    gss_release_buffer(&tmpMinor, &iov[0].buffer);
-#endif
+    ctx->state = EAP_STATE_ESTABLISHED;
 
-    return major;
+    return GSS_S_COMPLETE;
 }
 
 static OM_uint32
@@ -339,7 +458,7 @@ eapGssSmAcceptEstablished(OM_uint32 *minor,
                           gss_buffer_t outputToken)
 {
     /* Called with already established context */
-    *minor = EINVAL;
+    *minor = GSSEAP_CONTEXT_ESTABLISHED;
     return GSS_S_BAD_STATUS;
 }
 
@@ -353,10 +472,14 @@ static struct gss_eap_acceptor_sm {
                               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_GSS_CB,      TOK_TYPE_NONE,     eapGssSmAcceptGssChannelBindings },
-    { TOK_TYPE_NONE,        TOK_TYPE_NONE,     eapGssSmAcceptEstablished        },
+    { 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        },
+#ifdef GSSEAP_ENABLE_REAUTH
+    { TOK_TYPE_GSS_REAUTH,  TOK_TYPE_GSS_REAUTH, eapGssSmAcceptGssReauth          },
+#endif
 };
 
 OM_uint32
@@ -378,16 +501,14 @@ gss_accept_sec_context(OM_uint32 *minor,
     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;
 
     output_token->length = 0;
     output_token->value = NULL;
 
-    if (cred != GSS_C_NO_CREDENTIAL && !(cred->flags & CRED_FLAG_ACCEPT)) {
-        return GSS_S_NO_CRED;
-    }
-
     if (input_token == GSS_C_NO_BUFFER || input_token->length == 0) {
         return GSS_S_DEFECTIVE_TOKEN;
     }
@@ -397,24 +518,53 @@ gss_accept_sec_context(OM_uint32 *minor,
         if (GSS_ERROR(major))
             return major;
 
+        initialContextToken = 1;
         *context_handle = ctx;
     }
 
     GSSEAP_MUTEX_LOCK(&ctx->mutex);
 
+    /* Validate and lock credentials */
+    if (cred != GSS_C_NO_CREDENTIAL) {
+        GSSEAP_MUTEX_LOCK(&cred->mutex);
+
+        if ((cred->flags & CRED_FLAG_ACCEPT) == 0) {
+            *minor = GSSEAP_CRED_USAGE_MISMATCH;
+            major = GSS_S_NO_CRED;
+            goto cleanup;
+        }
+    }
+
     sm = &eapGssAcceptorSm[ctx->state];
 
     major = gssEapVerifyToken(minor, ctx, input_token,
-                              sm->inputTokenType, &innerInputToken);
+                              &tokType, &innerInputToken);
     if (GSS_ERROR(major))
         goto cleanup;
 
-    /* If credentials were provided, check they're usable with this mech */
     if (!gssEapCredAvailable(cred, ctx->mechanismUsed)) {
+        *minor = GSSEAP_WRONG_MECH;
         major = GSS_S_BAD_MECH;
         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 = EAP_STATE_KRB_REAUTH_GSS;
+    } else
+#endif
+    if (tokType != sm->inputTokenType) {
+        *minor = GSSEAP_WRONG_TOK_ID;
+        major = GSS_S_DEFECTIVE_TOKEN;
+        goto cleanup;
+    }
+
     do {
         sm = &eapGssAcceptorSm[ctx->state];
 
@@ -432,7 +582,7 @@ gss_accept_sec_context(OM_uint32 *minor,
         if (!gssEapInternalizeOid(ctx->mechanismUsed, mech_type))
             duplicateOid(&tmpMinor, ctx->mechanismUsed, mech_type);
     }
-    if (innerOutputToken.length != 0) {
+    if (innerOutputToken.value != NULL) {
         tmpMajor = gssEapMakeToken(&tmpMinor, ctx, &innerOutputToken,
                                    sm->outputTokenType, output_token);
         if (GSS_ERROR(tmpMajor)) {
@@ -448,17 +598,19 @@ gss_accept_sec_context(OM_uint32 *minor,
 
     if (major == GSS_S_COMPLETE) {
         if (src_name != NULL && ctx->initiatorName != GSS_C_NO_NAME) {
-            major = gss_duplicate_name(&tmpMinor, ctx->initiatorName, src_name);
+            major = gssEapDuplicateName(&tmpMinor, ctx->initiatorName, src_name);
             if (GSS_ERROR(major))
                 goto cleanup;
         }
         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);
 
 cleanup:
+    if (cred != GSS_C_NO_CREDENTIAL)
+        GSSEAP_MUTEX_UNLOCK(&cred->mutex);
     GSSEAP_MUTEX_UNLOCK(&ctx->mutex);
 
     if (GSS_ERROR(major))
@@ -469,3 +621,75 @@ cleanup:
     return major;
 }
 
+#ifdef GSSEAP_ENABLE_REAUTH
+static OM_uint32
+acceptReadyKrb(OM_uint32 *minor,
+               gss_ctx_id_t ctx,
+               gss_cred_id_t cred,
+               const gss_name_t initiator,
+               const gss_OID mech,
+               OM_uint32 timeRec)
+{
+    OM_uint32 major;
+
+    major = gssEapGlueToMechName(minor, initiator, &ctx->initiatorName);
+    if (GSS_ERROR(major))
+        return major;
+
+    if (cred != GSS_C_NO_CREDENTIAL && 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 = EAP_STATE_ESTABLISHED;
+
+    return GSS_S_COMPLETE;
+}
+
+static OM_uint32
+eapGssSmAcceptGssReauth(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)
+{
+    OM_uint32 major, tmpMinor;
+    gss_cred_id_t krbCred = GSS_C_NO_CREDENTIAL;
+    gss_name_t krbInitiator = GSS_C_NO_NAME;
+    gss_OID mech = GSS_C_NO_OID;
+    OM_uint32 gssFlags, timeRec = GSS_C_INDEFINITE;
+
+    ctx->flags |= CTX_FLAG_KRB_REAUTH_GSS;
+
+    if (cred != GSS_C_NO_CREDENTIAL)
+        krbCred = cred->krbCred;
+
+    major = gssAcceptSecContext(minor,
+                                &ctx->kerberosCtx,
+                                krbCred,
+                                inputToken,
+                                chanBindings,
+                                &krbInitiator,
+                                &mech,
+                                outputToken,
+                                &gssFlags,
+                                &timeRec,
+                                NULL);
+    if (major == GSS_S_COMPLETE) {
+        major = acceptReadyKrb(minor, ctx, cred,
+                               krbInitiator, mech, timeRec);
+    }
+
+    ctx->gssFlags = gssFlags;
+
+    gssReleaseName(&tmpMinor, &krbInitiator);
+
+    return major;
+}
+#endif /* GSSEAP_ENABLE_REAUTH */