1 /*- 2 * Copyright (c) 2009, Sun Microsystems, Inc. 3 * All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions are met: 7 * - Redistributions of source code must retain the above copyright notice, 8 * this list of conditions and the following disclaimer. 9 * - Redistributions in binary form must reproduce the above copyright notice, 10 * this list of conditions and the following disclaimer in the documentation 11 * and/or other materials provided with the distribution. 12 * - Neither the name of Sun Microsystems, Inc. nor the names of its 13 * contributors may be used to endorse or promote products derived 14 * from this software without specific prior written permission. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" 17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE 20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 26 * POSSIBILITY OF SUCH DAMAGE. 27 */ 28 29 #if defined(LIBC_SCCS) && !defined(lint) 30 static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro"; 31 static char *sccsid = "@(#)svc_auth_unix.c 2.3 88/08/01 4.0 RPCSRC"; 32 #endif 33 #include <sys/cdefs.h> 34 __FBSDID("$FreeBSD$"); 35 36 /* 37 * svc_auth_unix.c 38 * Handles UNIX flavor authentication parameters on the service side of rpc. 39 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT. 40 * _svcauth_unix does full blown unix style uid,gid+gids auth, 41 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths. 42 * Note: the shorthand has been gutted for efficiency. 43 * 44 * Copyright (C) 1984, Sun Microsystems, Inc. 45 */ 46 47 #include <sys/param.h> 48 #include <sys/lock.h> 49 #include <sys/mutex.h> 50 #include <sys/systm.h> 51 #include <sys/ucred.h> 52 53 #include <rpc/rpc.h> 54 55 #include <rpc/rpc_com.h> 56 57 #define MAX_MACHINE_NAME 255 58 #define NGRPS 16 59 60 /* 61 * Unix longhand authenticator 62 */ 63 enum auth_stat 64 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg) 65 { 66 enum auth_stat stat; 67 XDR xdrs; 68 int32_t *buf; 69 uint32_t time; 70 struct xucred *xcr; 71 u_int auth_len; 72 size_t str_len, gid_len; 73 u_int i; 74 75 xcr = rqst->rq_clntcred; 76 auth_len = (u_int)msg->rm_call.cb_cred.oa_length; 77 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len, 78 XDR_DECODE); 79 buf = XDR_INLINE(&xdrs, auth_len); 80 if (buf != NULL) { 81 time = IXDR_GET_UINT32(buf); 82 str_len = (size_t)IXDR_GET_UINT32(buf); 83 if (str_len > MAX_MACHINE_NAME) { 84 stat = AUTH_BADCRED; 85 goto done; 86 } 87 str_len = RNDUP(str_len); 88 buf += str_len / sizeof (int32_t); 89 xcr->cr_uid = IXDR_GET_UINT32(buf); 90 xcr->cr_groups[0] = IXDR_GET_UINT32(buf); 91 gid_len = (size_t)IXDR_GET_UINT32(buf); 92 if (gid_len > NGRPS) { 93 stat = AUTH_BADCRED; 94 goto done; 95 } 96 for (i = 0; i < gid_len; i++) { 97 if (i + 1 < XU_NGROUPS) 98 xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf); 99 else 100 buf++; 101 } 102 if (gid_len + 1 > XU_NGROUPS) 103 xcr->cr_ngroups = XU_NGROUPS; 104 else 105 xcr->cr_ngroups = gid_len + 1; 106 107 /* 108 * five is the smallest unix credentials structure - 109 * timestamp, hostname len (0), uid, gid, and gids len (0). 110 */ 111 if ((5 + gid_len) * BYTES_PER_XDR_UNIT + str_len > auth_len) { 112 (void) printf("bad auth_len gid %ld str %ld auth %u\n", 113 (long)gid_len, (long)str_len, auth_len); 114 stat = AUTH_BADCRED; 115 goto done; 116 } 117 } else if (! xdr_authunix_parms(&xdrs, &time, xcr)) { 118 stat = AUTH_BADCRED; 119 goto done; 120 } 121 122 rqst->rq_verf = _null_auth; 123 stat = AUTH_OK; 124 done: 125 XDR_DESTROY(&xdrs); 126 127 return (stat); 128 } 129 130 131 /* 132 * Shorthand unix authenticator 133 * Looks up longhand in a cache. 134 */ 135 /*ARGSUSED*/ 136 enum auth_stat 137 _svcauth_short(rqst, msg) 138 struct svc_req *rqst; 139 struct rpc_msg *msg; 140 { 141 return (AUTH_REJECTEDCRED); 142 } 143