1 /* $OpenBSD: svc_auth_unix.c,v 1.13 2015/11/01 03:45:29 guenther Exp $ */ 2 3 /* 4 * Copyright (c) 2010, Oracle America, Inc. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions are 8 * met: 9 * 10 * * Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * * Redistributions in binary form must reproduce the above 13 * copyright notice, this list of conditions and the following 14 * disclaimer in the documentation and/or other materials 15 * provided with the distribution. 16 * * Neither the name of the "Oracle America, Inc." nor the names of its 17 * contributors may be used to endorse or promote products derived 18 * from this software without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 21 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 22 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 23 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 24 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 25 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE 27 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 28 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, 29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING 30 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 31 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 32 */ 33 34 /* 35 * svc_auth_unix.c 36 * Handles UNIX flavor authentication parameters on the service side of rpc. 37 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT. 38 * _svcauth_unix does full blown unix style uid,gid+gids auth, 39 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths. 40 * Note: the shorthand has been gutted for efficiency. 41 */ 42 43 #include <stdio.h> 44 #include <rpc/rpc.h> 45 #include <string.h> 46 47 /* 48 * Unix longhand authenticator 49 */ 50 enum auth_stat 51 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg) 52 { 53 enum auth_stat stat; 54 XDR xdrs; 55 struct authunix_parms *aup; 56 int32_t *buf; 57 struct area { 58 struct authunix_parms area_aup; 59 char area_machname[MAX_MACHINE_NAME+1]; 60 int area_gids[NGRPS]; 61 } *area; 62 u_int auth_len; 63 u_int str_len, gid_len; 64 u_int i; 65 66 area = (struct 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 = (u_int)msg->rm_call.cb_cred.oa_length; 71 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len,XDR_DECODE); 72 buf = XDR_INLINE(&xdrs, auth_len); 73 if (buf != NULL) { 74 aup->aup_time = IXDR_GET_LONG(buf); 75 str_len = IXDR_GET_U_LONG(buf); 76 if (str_len > MAX_MACHINE_NAME) { 77 stat = AUTH_BADCRED; 78 goto done; 79 } 80 memcpy(aup->aup_machname, (caddr_t)buf, (u_int)str_len); 81 aup->aup_machname[str_len] = 0; 82 str_len = RNDUP(str_len); 83 buf += str_len / sizeof (int32_t); 84 aup->aup_uid = IXDR_GET_LONG(buf); 85 aup->aup_gid = IXDR_GET_LONG(buf); 86 gid_len = IXDR_GET_U_LONG(buf); 87 if (gid_len > NGRPS) { 88 stat = AUTH_BADCRED; 89 goto done; 90 } 91 aup->aup_len = gid_len; 92 for (i = 0; i < gid_len; i++) { 93 aup->aup_gids[i] = IXDR_GET_LONG(buf); 94 } 95 /* 96 * five is the smallest unix credentials structure - 97 * timestamp, hostname len (0), uid, gid, and gids len (0). 98 */ 99 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) { 100 stat = AUTH_BADCRED; 101 goto done; 102 } 103 } else if (! xdr_authunix_parms(&xdrs, aup)) { 104 xdrs.x_op = XDR_FREE; 105 (void)xdr_authunix_parms(&xdrs, aup); 106 stat = AUTH_BADCRED; 107 goto done; 108 } 109 rqst->rq_xprt->xp_verf.oa_flavor = AUTH_NULL; 110 rqst->rq_xprt->xp_verf.oa_length = 0; 111 stat = AUTH_OK; 112 done: 113 XDR_DESTROY(&xdrs); 114 return (stat); 115 } 116 DEF_STRONG(_svcauth_unix); 117 118 119 /* 120 * Shorthand unix authenticator 121 * Looks up longhand in a cache. 122 */ 123 enum auth_stat 124 _svcauth_short(struct svc_req *rqst, struct rpc_msg *msg) 125 { 126 return (AUTH_REJECTEDCRED); 127 } 128 DEF_STRONG(_svcauth_short); 129