1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License, Version 1.0 only 6 * (the "License"). You may not use this file except in compliance 7 * with the License. 8 * 9 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10 * or http://www.opensolaris.org/os/licensing. 11 * See the License for the specific language governing permissions 12 * and limitations under the License. 13 * 14 * When distributing Covered Code, include this CDDL HEADER in each 15 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16 * If applicable, add the following below this CDDL HEADER, with the 17 * fields enclosed by brackets "[]" replaced with your own identifying 18 * information: Portions Copyright [yyyy] [name of copyright owner] 19 * 20 * CDDL HEADER END 21 */ 22 23 /* 24 * Copyright 2006 Sun Microsystems, Inc. All rights reserved. 25 * Copyright 2017 Joyent Inc 26 * Use is subject to license terms. 27 */ 28 29 /* 30 * Handles the loopback UNIX flavor authentication parameters on the 31 * service side of rpc. 32 */ 33 34 #include "mt.h" 35 #include <stdio.h> 36 #include <rpc/rpc.h> 37 #include <syslog.h> 38 #include <sys/types.h> 39 #include <sys/debug.h> 40 41 /* 42 * NOTE: this has to fit inside RQCRED_SIZE bytes. If you update this struct, 43 * double-check it still fits. 44 */ 45 struct authlpbk_area { 46 struct authsys_parms area_aup; 47 char area_machname[MAX_MACHINE_NAME+1]; 48 gid_t area_gids[NGRPS_LOOPBACK]; 49 }; 50 CTASSERT(sizeof (struct authlpbk_area) <= RQCRED_SIZE); 51 52 /* 53 * Loopback system (Unix) longhand authenticator 54 */ 55 enum auth_stat 56 __svcauth_loopback(struct svc_req *rqst, struct rpc_msg *msg) 57 { 58 struct authsys_parms *aup; 59 int32_t *buf; 60 struct authlpbk_area *area; 61 uint_t auth_len; 62 uint_t str_len, gid_len; 63 int i; 64 65 /* LINTED pointer cast */ 66 area = (struct authlpbk_area *)rqst->rq_clntcred; 67 aup = &area->area_aup; 68 aup->aup_machname = area->area_machname; 69 aup->aup_gids = area->area_gids; 70 auth_len = msg->rm_call.cb_cred.oa_length; 71 if (auth_len == 0) 72 return (AUTH_BADCRED); 73 74 /* LINTED pointer cast */ 75 buf = (int32_t *)msg->rm_call.cb_cred.oa_base; 76 77 aup->aup_time = IXDR_GET_INT32(buf); 78 str_len = IXDR_GET_U_INT32(buf); 79 if (str_len > MAX_MACHINE_NAME) 80 return (AUTH_BADCRED); 81 if (str_len > auth_len) 82 return (AUTH_BADCRED); 83 (void) memcpy(aup->aup_machname, buf, str_len); 84 aup->aup_machname[str_len] = 0; 85 str_len = RNDUP(str_len); 86 buf += str_len / sizeof (int); 87 aup->aup_uid = IXDR_GET_INT32(buf); 88 aup->aup_gid = IXDR_GET_INT32(buf); 89 gid_len = IXDR_GET_U_INT32(buf); 90 if (gid_len > NGRPS_LOOPBACK) 91 return (AUTH_BADCRED); 92 /* 93 * five is the smallest unix credentials structure - 94 * timestamp, hostname len (0), uid, gid, and gids len (0). 95 */ 96 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) 97 return (AUTH_BADCRED); 98 99 aup->aup_len = gid_len; 100 for (i = 0; i < gid_len; i++) { 101 aup->aup_gids[i] = (gid_t)IXDR_GET_INT32(buf); 102 } 103 104 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL; 105 rqst->rq_xprt->xp_verf.oa_length = 0; 106 107 return (AUTH_OK); 108 } 109