/* * Copyright 1993 OpenVision Technologies, Inc., All Rights Reserved. * */ #include #include #include #include #include #ifdef GSSAPI_KRB5 #include #endif #include #include #include "gssrpcint.h" #ifdef __CODECENTER__ #define DEBUG_GSSAPI 1 #endif #ifdef DEBUG_GSSAPI int auth_debug_gssapi = DEBUG_GSSAPI; extern void gssrpcint_printf(const char *format, ...); #define L_PRINTF(l,args) if (auth_debug_gssapi >= l) gssrpcint_printf args #define PRINTF(args) L_PRINTF(99, args) #define AUTH_GSSAPI_DISPLAY_STATUS(args) \ if (auth_debug_gssapi) auth_gssapi_display_status args #else #define PRINTF(args) #define L_PRINTF(l, args) #define AUTH_GSSAPI_DISPLAY_STATUS(args) #endif static void auth_gssapi_nextverf(AUTH *); static bool_t auth_gssapi_marshall(AUTH *, XDR *); static bool_t auth_gssapi_validate(AUTH *, struct opaque_auth *); static bool_t auth_gssapi_refresh(AUTH *, struct rpc_msg *); static bool_t auth_gssapi_wrap(AUTH *, XDR *, xdrproc_t, caddr_t); static bool_t auth_gssapi_unwrap(AUTH *, XDR *, xdrproc_t, caddr_t); static void auth_gssapi_destroy(AUTH *); static bool_t marshall_new_creds(AUTH *, bool_t, gss_buffer_t); static struct auth_ops auth_gssapi_ops = { auth_gssapi_nextverf, auth_gssapi_marshall, auth_gssapi_validate, auth_gssapi_refresh, auth_gssapi_destroy, auth_gssapi_wrap, auth_gssapi_unwrap, }; /* * the ah_private data structure for an auth_handle */ struct auth_gssapi_data { bool_t established; CLIENT *clnt; gss_ctx_id_t context; gss_buffer_desc client_handle; uint32_t seq_num; int def_cred; /* pre-serialized ah_cred */ unsigned char cred_buf[MAX_AUTH_BYTES]; uint32_t cred_len; }; #define AUTH_PRIVATE(auth) ((struct auth_gssapi_data *)auth->ah_private) /* * Function: auth_gssapi_create_default * * Purpose: Create a GSS-API style authenticator, with default * options, and return the handle. * * Effects: See design document, section XXX. */ AUTH *auth_gssapi_create_default(CLIENT *clnt, char *service_name) { AUTH *auth; OM_uint32 gssstat, minor_stat; gss_buffer_desc input_name; gss_name_t target_name; input_name.value = service_name; input_name.length = strlen(service_name) + 1; gssstat = gss_import_name(&minor_stat, &input_name, gss_nt_service_name, &target_name); if (gssstat != GSS_S_COMPLETE) { AUTH_GSSAPI_DISPLAY_STATUS(("parsing name", gssstat, minor_stat)); rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = ENOMEM; return NULL; } auth = auth_gssapi_create(clnt, &gssstat, &minor_stat, GSS_C_NO_CREDENTIAL, target_name, GSS_C_NULL_OID, GSS_C_MUTUAL_FLAG | GSS_C_REPLAY_FLAG, 0, NULL, NULL, NULL); gss_release_name(&minor_stat, &target_name); return auth; } /* * Function: auth_gssapi_create * * Purpose: Create a GSS-API style authenticator, with all the * options, and return the handle. * * Effects: See design document, section XXX. */ AUTH *auth_gssapi_create( CLIENT *clnt, OM_uint32 *gssstat, OM_uint32 *minor_stat, gss_cred_id_t claimant_cred_handle, gss_name_t target_name, gss_OID mech_type, OM_uint32 req_flags, OM_uint32 time_req, gss_OID *actual_mech_type, OM_uint32 *ret_flags, OM_uint32 *time_rec) { AUTH *auth, *save_auth; struct auth_gssapi_data *pdata; struct gss_channel_bindings_struct bindings, *bindp; struct sockaddr_in laddr, raddr; enum clnt_stat callstat; struct timeval timeout; int bindings_failed; rpcproc_t init_func; auth_gssapi_init_arg call_arg; auth_gssapi_init_res call_res; gss_buffer_desc *input_token, isn_buf; memset(&rpc_createerr, 0, sizeof(rpc_createerr)); /* this timeout is only used if clnt_control(clnt, CLSET_TIMEOUT) */ /* has not already been called.. therefore, we can just pick */ /* something reasonable-sounding.. */ timeout.tv_sec = 30; timeout.tv_usec = 0; auth = NULL; pdata = NULL; /* don't assume the caller will want to change clnt->cl_auth */ save_auth = clnt->cl_auth; auth = (AUTH *) malloc(sizeof(*auth)); pdata = (struct auth_gssapi_data *) malloc(sizeof(*pdata)); if (auth == NULL || pdata == NULL) { /* They needn't both have failed; clean up. */ free(auth); free(pdata); auth = NULL; pdata = NULL; rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = ENOMEM; goto cleanup; } memset(auth, 0, sizeof(*auth)); memset(pdata, 0, sizeof(*pdata)); auth->ah_ops = &auth_gssapi_ops; auth->ah_private = (caddr_t) pdata; /* initial creds are auth_msg TRUE and no handle */ marshall_new_creds(auth, TRUE, NULL); /* initial verifier is empty */ auth->ah_verf.oa_flavor = AUTH_GSSAPI; auth->ah_verf.oa_base = NULL; auth->ah_verf.oa_length = 0; AUTH_PRIVATE(auth)->established = FALSE; AUTH_PRIVATE(auth)->clnt = clnt; AUTH_PRIVATE(auth)->def_cred = (claimant_cred_handle == GSS_C_NO_CREDENTIAL); clnt->cl_auth = auth; /* start by trying latest version */ call_arg.version = 4; bindings_failed = 0; try_new_version: /* set state for initial call to init_sec_context */ input_token = GSS_C_NO_BUFFER; AUTH_PRIVATE(auth)->context = GSS_C_NO_CONTEXT; init_func = AUTH_GSSAPI_INIT; #ifdef GSSAPI_KRB5 /* * OV servers up to version 3 used the old mech id. Beta 7 * servers used version 3 with the new mech id; however, the beta * 7 gss-api accept_sec_context accepts either mech id. Thus, if * any server rejects version 4, we fall back to version 3 with * the old mech id; for the OV server it will be right, and for * the beta 7 server it will be accepted. Not ideal, but it * works. */ if (call_arg.version < 4 && (mech_type == gss_mech_krb5 || mech_type == GSS_C_NULL_OID)) mech_type = (gss_OID) gss_mech_krb5_old; #endif if (!bindings_failed && call_arg.version >= 3) { if (clnt_control(clnt, CLGET_LOCAL_ADDR, &laddr) == FALSE) { PRINTF(("gssapi_create: CLGET_LOCAL_ADDR failed")); goto cleanup; } if (clnt_control(clnt, CLGET_SERVER_ADDR, &raddr) == FALSE) { PRINTF(("gssapi_create: CLGET_SERVER_ADDR failed")); goto cleanup; } memset(&bindings, 0, sizeof(bindings)); bindings.application_data.length = 0; bindings.initiator_addrtype = GSS_C_AF_INET; bindings.initiator_address.length = 4; bindings.initiator_address.value = &laddr.sin_addr.s_addr; bindings.acceptor_addrtype = GSS_C_AF_INET; bindings.acceptor_address.length = 4; bindings.acceptor_address.value = &raddr.sin_addr.s_addr; bindp = &bindings; } else { bindp = NULL; } memset(&call_res, 0, sizeof(call_res)); next_token: *gssstat = gss_init_sec_context(minor_stat, claimant_cred_handle, &AUTH_PRIVATE(auth)->context, target_name, mech_type, req_flags, time_req, bindp, input_token, actual_mech_type, &call_arg.token, ret_flags, time_rec); if (*gssstat != GSS_S_COMPLETE && *gssstat != GSS_S_CONTINUE_NEEDED) { AUTH_GSSAPI_DISPLAY_STATUS(("initializing context", *gssstat, *minor_stat)); goto cleanup; } /* if we got a token, pass it on */ if (call_arg.token.length != 0) { /* * sanity check: if we received a signed isn in the last * response then there *cannot* be another token to send */ if (call_res.signed_isn.length != 0) { PRINTF(("gssapi_create: unexpected token from init_sec\n")); goto cleanup; } PRINTF(("gssapi_create: calling GSSAPI_INIT (%d)\n", init_func)); memset(&call_res, 0, sizeof(call_res)); callstat = clnt_call(clnt, init_func, xdr_authgssapi_init_arg, &call_arg, xdr_authgssapi_init_res, &call_res, timeout); gss_release_buffer(minor_stat, &call_arg.token); if (callstat != RPC_SUCCESS) { struct rpc_err err; clnt_geterr(clnt, &err); if (callstat == RPC_AUTHERROR && (err.re_why == AUTH_BADCRED || err.re_why == AUTH_FAILED) && call_arg.version >= 1) { L_PRINTF(1, ("call_arg protocol version %d rejected, trying %d.\n", call_arg.version, call_arg.version-1)); call_arg.version--; goto try_new_version; } else { PRINTF(("gssapi_create: GSSAPI_INIT (%d) failed, stat %d\n", init_func, callstat)); } goto cleanup; } else if (call_res.version != call_arg.version && !(call_arg.version == 2 && call_res.version == 1)) { /* * The Secure 1.1 servers always respond with version * 1. Thus, if we just tried a version >=3, fall all * the way back to version 1 since that is all they * understand */ if (call_arg.version > 2 && call_res.version == 1) { L_PRINTF(1, ("Talking to Secure 1.1 server, using version 1.\n")); call_arg.version = 1; goto try_new_version; } PRINTF(("gssapi_create: invalid call_res vers %d\n", call_res.version)); goto cleanup; } else if (call_res.gss_major != GSS_S_COMPLETE) { AUTH_GSSAPI_DISPLAY_STATUS(("in response from server", call_res.gss_major, call_res.gss_minor)); goto cleanup; } PRINTF(("gssapi_create: GSSAPI_INIT (%d) succeeded\n", init_func)); init_func = AUTH_GSSAPI_CONTINUE_INIT; /* check for client_handle */ if (AUTH_PRIVATE(auth)->client_handle.length == 0) { if (call_res.client_handle.length == 0) { PRINTF(("gssapi_create: expected client_handle\n")); goto cleanup; } else { PRINTF(("gssapi_create: got client_handle %d\n", *((uint32_t *)call_res.client_handle.value))); GSS_DUP_BUFFER(AUTH_PRIVATE(auth)->client_handle, call_res.client_handle); /* auth_msg is TRUE; there may be more tokens */ marshall_new_creds(auth, TRUE, &AUTH_PRIVATE(auth)->client_handle); } } else if (!GSS_BUFFERS_EQUAL(AUTH_PRIVATE(auth)->client_handle, call_res.client_handle)) { PRINTF(("gssapi_create: got different client_handle\n")); goto cleanup; } /* check for token */ if (call_res.token.length==0 && *gssstat==GSS_S_CONTINUE_NEEDED) { PRINTF(("gssapi_create: expected token\n")); goto cleanup; } else if (call_res.token.length != 0) { if (*gssstat == GSS_S_COMPLETE) { PRINTF(("gssapi_create: got unexpected token\n")); goto cleanup; } else { /* assumes call_res is safe until init_sec_context */ input_token = &call_res.token; PRINTF(("gssapi_create: got new token\n")); } } } /* check for isn */ if (*gssstat == GSS_S_COMPLETE) { if (call_res.signed_isn.length == 0) { PRINTF(("gssapi_created: expected signed isn\n")); goto cleanup; } else { PRINTF(("gssapi_create: processing signed isn\n")); /* don't check conf (integ only) or qop (accpet default) */ *gssstat = gss_unseal(minor_stat, AUTH_PRIVATE(auth)->context, &call_res.signed_isn, &isn_buf, NULL, NULL); if (*gssstat != GSS_S_COMPLETE) { AUTH_GSSAPI_DISPLAY_STATUS(("unsealing isn", *gssstat, *minor_stat)); goto cleanup; } else if (isn_buf.length != sizeof(uint32_t)) { PRINTF(("gssapi_create: gss_unseal gave %d bytes\n", (int) isn_buf.length)); goto cleanup; } AUTH_PRIVATE(auth)->seq_num = (uint32_t) ntohl(*((uint32_t*)isn_buf.value)); *gssstat = gss_release_buffer(minor_stat, &isn_buf); if (*gssstat != GSS_S_COMPLETE) { AUTH_GSSAPI_DISPLAY_STATUS(("releasing unsealed isn", *gssstat, *minor_stat)); goto cleanup; } PRINTF(("gssapi_create: isn is %d\n", AUTH_PRIVATE(auth)->seq_num)); /* we no longer need these results.. */ xdr_free(xdr_authgssapi_init_res, &call_res); } } else if (call_res.signed_isn.length != 0) { PRINTF(("gssapi_create: got signed isn, can't check yet\n")); } /* results were okay.. continue if necessary */ if (*gssstat == GSS_S_CONTINUE_NEEDED) { PRINTF(("gssapi_create: not done, continuing\n")); goto next_token; } /* * Done! Context is established, we have client_handle and isn. */ AUTH_PRIVATE(auth)->established = TRUE; marshall_new_creds(auth, FALSE, &AUTH_PRIVATE(auth)->client_handle); PRINTF(("gssapi_create: done. client_handle %#x, isn %d\n\n", *((uint32_t *)AUTH_PRIVATE(auth)->client_handle.value), AUTH_PRIVATE(auth)->seq_num)); /* don't assume the caller will want to change clnt->cl_auth */ clnt->cl_auth = save_auth; return auth; /******************************************************************/ cleanup: PRINTF(("gssapi_create: bailing\n\n")); if (auth) { if (AUTH_PRIVATE(auth)) auth_gssapi_destroy(auth); else free(auth); auth = NULL; } /* don't assume the caller will want to change clnt->cl_auth */ clnt->cl_auth = save_auth; if (rpc_createerr.cf_stat == 0) rpc_createerr.cf_stat = RPC_AUTHERROR; return auth; } /* * Function: marshall_new_creds * * Purpose: (pre-)serialize auth_msg and client_handle fields of * auth_gssapi_creds into auth->cred_buf * * Arguments: * * auth (r/w) the AUTH structure to modify * auth_msg (r) the auth_msg field to serialize * client_handle (r) the client_handle field to serialize, or * NULL * * Returns: TRUE if successful, FALSE if not * * Requires: auth must point to a valid GSS-API auth structure, auth_msg * must be TRUE or FALSE, client_handle must be a gss_buffer_t with a valid * value and length field or NULL. * * Effects: auth->ah_cred is set to the serialized auth_gssapi_creds * version 2 structure (stored in the cred_buf field of private data) * containing version, auth_msg and client_handle. * auth->ah_cred.oa_flavor is set to AUTH_GSSAPI. If cliend_handle is * NULL, it is treated as if it had a length of 0 and a value of NULL. * * Modifies: auth */ static bool_t marshall_new_creds( AUTH *auth, bool_t auth_msg, gss_buffer_t client_handle) { auth_gssapi_creds creds; XDR xdrs; PRINTF(("marshall_new_creds: starting\n")); creds.version = 2; creds.auth_msg = auth_msg; if (client_handle) GSS_COPY_BUFFER(creds.client_handle, *client_handle) else { creds.client_handle.length = 0; creds.client_handle.value = NULL; } xdrmem_create(&xdrs, (caddr_t) AUTH_PRIVATE(auth)->cred_buf, MAX_AUTH_BYTES, XDR_ENCODE); if (! xdr_authgssapi_creds(&xdrs, &creds)) { PRINTF(("marshall_new_creds: failed encoding auth_gssapi_creds\n")); XDR_DESTROY(&xdrs); return FALSE; } AUTH_PRIVATE(auth)->cred_len = xdr_getpos(&xdrs); XDR_DESTROY(&xdrs); PRINTF(("marshall_new_creds: auth_gssapi_creds is %d bytes\n", AUTH_PRIVATE(auth)->cred_len)); auth->ah_cred.oa_flavor = AUTH_GSSAPI; auth->ah_cred.oa_base = (char *) AUTH_PRIVATE(auth)->cred_buf; auth->ah_cred.oa_length = AUTH_PRIVATE(auth)->cred_len; PRINTF(("marshall_new_creds: succeeding\n")); return TRUE; } /* * Function: auth_gssapi_nextverf * * Purpose: None. * * Effects: None. Never called. */ static void auth_gssapi_nextverf(AUTH *auth) { } /* * Function: auth_gssapi_marhsall * * Purpose: Marshall RPC credentials and verifier onto xdr stream. * * Arguments: * * auth (r/w) AUTH structure for client * xdrs (r/w) XDR stream to marshall to * * Returns: boolean indicating success/failure * * Effects: * * The pre-serialized credentials in cred_buf are serialized. If the * context is established, the sealed sequence number is serialized as * the verifier. If the context is not established, an empty verifier * is serialized. The sequence number is *not* incremented, because * this function is called multiple times if retransmission is required. * * If this took all the header fields as arguments, it could sign * them. */ static bool_t auth_gssapi_marshall( AUTH *auth, XDR *xdrs) { OM_uint32 minor_stat; gss_buffer_desc out_buf; uint32_t seq_num; if (AUTH_PRIVATE(auth)->established == TRUE) { PRINTF(("gssapi_marshall: starting\n")); seq_num = AUTH_PRIVATE(auth)->seq_num + 1; PRINTF(("gssapi_marshall: sending seq_num %d\n", seq_num)); if (auth_gssapi_seal_seq(AUTH_PRIVATE(auth)->context, seq_num, &out_buf) == FALSE) { PRINTF(("gssapi_marhshall: seal failed\n")); } auth->ah_verf.oa_base = out_buf.value; auth->ah_verf.oa_length = out_buf.length; if (! xdr_opaque_auth(xdrs, &auth->ah_cred) || ! xdr_opaque_auth(xdrs, &auth->ah_verf)) { (void) gss_release_buffer(&minor_stat, &out_buf); return FALSE; } (void) gss_release_buffer(&minor_stat, &out_buf); } else { PRINTF(("gssapi_marshall: not established, sending null verf\n")); auth->ah_verf.oa_base = NULL; auth->ah_verf.oa_length = 0; if (! xdr_opaque_auth(xdrs, &auth->ah_cred) || ! xdr_opaque_auth(xdrs, &auth->ah_verf)) { return FALSE; } } return TRUE; } /* * Function: auth_gssapi_validate * * Purpose: Validate RPC response verifier from server. * * Effects: See design document, section XXX. */ static bool_t auth_gssapi_validate( AUTH *auth, struct opaque_auth *verf) { gss_buffer_desc in_buf; uint32_t seq_num; if (AUTH_PRIVATE(auth)->established == FALSE) { PRINTF(("gssapi_validate: not established, noop\n")); return TRUE; } PRINTF(("gssapi_validate: starting\n")); in_buf.length = verf->oa_length; in_buf.value = verf->oa_base; if (auth_gssapi_unseal_seq(AUTH_PRIVATE(auth)->context, &in_buf, &seq_num) == FALSE) { PRINTF(("gssapi_validate: failed unsealing verifier\n")); return FALSE; } /* we sent seq_num+1, so we should get back seq_num+2 */ if (AUTH_PRIVATE(auth)->seq_num+2 != seq_num) { PRINTF(("gssapi_validate: expecting seq_num %d, got %d (%#x)\n", AUTH_PRIVATE(auth)->seq_num + 2, seq_num, seq_num)); return FALSE; } PRINTF(("gssapi_validate: seq_num %d okay\n", seq_num)); /* +1 for successful transmission, +1 for successful validation */ AUTH_PRIVATE(auth)->seq_num += 2; PRINTF(("gssapi_validate: succeeding\n")); return TRUE; } /* * Function: auth_gssapi_refresh * * Purpose: Attempts to resyncrhonize the sequence number. * * Effects: * * When the server receives a properly authenticated RPC call, it * increments the sequence number it is expecting from the client. * But if the server's response is lost for any reason, the client * can't know whether the server ever received it, assumes it didn't, * and does *not* increment its sequence number. Thus, the client's * next call will fail with AUTH_REJECTEDCRED because the server will * think it is a replay attack. * * When an AUTH_REJECTEDCRED error arrives, this function attempts to * resyncrhonize by incrementing the client's sequence number and * returning TRUE. If any other error arrives, it returns FALSE. */ static bool_t auth_gssapi_refresh( AUTH *auth, struct rpc_msg *msg) { if (msg->rm_reply.rp_rjct.rj_stat == AUTH_ERROR && msg->rm_reply.rp_rjct.rj_why == AUTH_REJECTEDVERF) { PRINTF(("gssapi_refresh: rejected verifier, incrementing\n")); AUTH_PRIVATE(auth)->seq_num++; return TRUE; } else { PRINTF(("gssapi_refresh: failing\n")); return FALSE; } } /* * Function: auth_gssapi_destroy * * Purpose: Destroy a GSS-API authentication structure. * * Effects: This function destroys the GSS-API authentication * context, and sends a message to the server instructing it to * invokte gss_process_token() and thereby destroy its corresponding * context. Since the client doesn't really care whether the server * gets this message, no failures are reported. */ static void auth_gssapi_destroy(AUTH *auth) { struct timeval timeout; OM_uint32 gssstat, minor_stat; gss_cred_id_t cred; int callstat; if (AUTH_PRIVATE(auth)->client_handle.length == 0) { PRINTF(("gssapi_destroy: no client_handle, not calling destroy\n")); goto skip_call; } PRINTF(("gssapi_destroy: marshalling new creds\n")); if (!marshall_new_creds(auth, TRUE, &AUTH_PRIVATE(auth)->client_handle)) { PRINTF(("gssapi_destroy: marshall_new_creds failed\n")); goto skip_call; } PRINTF(("gssapi_destroy: calling GSSAPI_DESTROY\n")); timeout.tv_sec = 1; timeout.tv_usec = 0; callstat = clnt_call(AUTH_PRIVATE(auth)->clnt, AUTH_GSSAPI_DESTROY, xdr_void, NULL, xdr_void, NULL, timeout); if (callstat != RPC_SUCCESS) clnt_sperror(AUTH_PRIVATE(auth)->clnt, "gssapi_destroy: GSSAPI_DESTROY failed"); skip_call: PRINTF(("gssapi_destroy: deleting context\n")); gssstat = gss_delete_sec_context(&minor_stat, &AUTH_PRIVATE(auth)->context, NULL); if (gssstat != GSS_S_COMPLETE) AUTH_GSSAPI_DISPLAY_STATUS(("deleting context", gssstat, minor_stat)); if (AUTH_PRIVATE(auth)->def_cred) { cred = GSS_C_NO_CREDENTIAL; gssstat = gss_release_cred(&minor_stat, &cred); if (gssstat != GSS_S_COMPLETE) AUTH_GSSAPI_DISPLAY_STATUS(("deleting default credential", gssstat, minor_stat)); } free(AUTH_PRIVATE(auth)->client_handle.value); #if 0 PRINTF(("gssapi_destroy: calling GSSAPI_EXIT\n")); AUTH_PRIVATE(auth)->established = FALSE; callstat = clnt_call(AUTH_PRIVATE(auth)->clnt, AUTH_GSSAPI_EXIT, xdr_void, NULL, xdr_void, NULL, timeout); #endif free(auth->ah_private); free(auth); PRINTF(("gssapi_destroy: done\n")); } /* * Function: auth_gssapi_wrap * * Purpose: encrypt the serialized arguments from xdr_func applied to * xdr_ptr and write the result to xdrs. * * Effects: See design doc, section XXX. */ static bool_t auth_gssapi_wrap( AUTH *auth, XDR *out_xdrs, bool_t (*xdr_func)(), caddr_t xdr_ptr) { OM_uint32 gssstat, minor_stat; if (! AUTH_PRIVATE(auth)->established) { PRINTF(("gssapi_wrap: context not established, noop\n")); return (*xdr_func)(out_xdrs, xdr_ptr); } else if (! auth_gssapi_wrap_data(&gssstat, &minor_stat, AUTH_PRIVATE(auth)->context, AUTH_PRIVATE(auth)->seq_num+1, out_xdrs, xdr_func, xdr_ptr)) { if (gssstat != GSS_S_COMPLETE) AUTH_GSSAPI_DISPLAY_STATUS(("encrypting function arguments", gssstat, minor_stat)); return FALSE; } else return TRUE; } /* * Function: auth_gssapi_unwrap * * Purpose: read encrypted arguments from xdrs, decrypt, and * deserialize with xdr_func into xdr_ptr. * * Effects: See design doc, section XXX. */ static bool_t auth_gssapi_unwrap( AUTH *auth, XDR *in_xdrs, bool_t (*xdr_func)(), caddr_t xdr_ptr) { OM_uint32 gssstat, minor_stat; if (! AUTH_PRIVATE(auth)->established) { PRINTF(("gssapi_unwrap: context not established, noop\n")); return (*xdr_func)(in_xdrs, xdr_ptr); } else if (! auth_gssapi_unwrap_data(&gssstat, &minor_stat, AUTH_PRIVATE(auth)->context, AUTH_PRIVATE(auth)->seq_num, in_xdrs, xdr_func, xdr_ptr)) { if (gssstat != GSS_S_COMPLETE) AUTH_GSSAPI_DISPLAY_STATUS(("decrypting function arguments", gssstat, minor_stat)); return FALSE; } else return TRUE; }