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