1 /* 2 * Sun RPC is a product of Sun Microsystems, Inc. and is provided for 3 * unrestricted use provided that this legend is included on all tape 4 * media and as a part of the software program in whole or part. Users 5 * may copy or modify Sun RPC without charge, but are not authorized 6 * to license or distribute it to anyone else except as part of a product or 7 * program developed by the user. 8 * 9 * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE 10 * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR 11 * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. 12 * 13 * Sun RPC is provided with no support and without any obligation on the 14 * part of Sun Microsystems, Inc. to assist in its use, correction, 15 * modification or enhancement. 16 * 17 * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE 18 * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC 19 * OR ANY PART THEREOF. 20 * 21 * In no event will Sun Microsystems, Inc. be liable for any lost revenue 22 * or profits or other special, indirect and consequential damages, even if 23 * Sun has been advised of the possibility of such damages. 24 * 25 * Sun Microsystems, Inc. 26 * 2550 Garcia Avenue 27 * Mountain View, California 94043 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static char *sccsid2 = "@(#)svc_auth_unix.c 1.28 88/02/08 Copyr 1984 Sun Micro"; 32 static char *sccsid = "@(#)svc_auth_unix.c 2.3 88/08/01 4.0 RPCSRC"; 33 #endif 34 #include <sys/cdefs.h> 35 __FBSDID("$FreeBSD$"); 36 37 /* 38 * svc_auth_unix.c 39 * Handles UNIX flavor authentication parameters on the service side of rpc. 40 * There are two svc auth implementations here: AUTH_UNIX and AUTH_SHORT. 41 * _svcauth_unix does full blown unix style uid,gid+gids auth, 42 * _svcauth_short uses a shorthand auth to index into a cache of longhand auths. 43 * Note: the shorthand has been gutted for efficiency. 44 * 45 * Copyright (C) 1984, Sun Microsystems, Inc. 46 */ 47 48 #include <sys/param.h> 49 #include <sys/lock.h> 50 #include <sys/mutex.h> 51 #include <sys/systm.h> 52 #include <sys/ucred.h> 53 54 #include <rpc/rpc.h> 55 56 #include <rpc/rpc_com.h> 57 58 #define MAX_MACHINE_NAME 255 59 #define NGRPS 16 60 61 /* 62 * Unix longhand authenticator 63 */ 64 enum auth_stat 65 _svcauth_unix(struct svc_req *rqst, struct rpc_msg *msg) 66 { 67 enum auth_stat stat; 68 XDR xdrs; 69 int32_t *buf; 70 uint32_t time; 71 struct xucred *xcr; 72 u_int auth_len; 73 size_t str_len, gid_len; 74 u_int i; 75 76 xcr = rqst->rq_clntcred; 77 auth_len = (u_int)msg->rm_call.cb_cred.oa_length; 78 xdrmem_create(&xdrs, msg->rm_call.cb_cred.oa_base, auth_len, 79 XDR_DECODE); 80 buf = XDR_INLINE(&xdrs, auth_len); 81 if (buf != NULL) { 82 time = IXDR_GET_UINT32(buf); 83 str_len = (size_t)IXDR_GET_UINT32(buf); 84 if (str_len > MAX_MACHINE_NAME) { 85 stat = AUTH_BADCRED; 86 goto done; 87 } 88 str_len = RNDUP(str_len); 89 buf += str_len / sizeof (int32_t); 90 xcr->cr_uid = IXDR_GET_UINT32(buf); 91 xcr->cr_groups[0] = IXDR_GET_UINT32(buf); 92 gid_len = (size_t)IXDR_GET_UINT32(buf); 93 if (gid_len > NGRPS) { 94 stat = AUTH_BADCRED; 95 goto done; 96 } 97 for (i = 0; i < gid_len; i++) { 98 if (i + 1 < NGROUPS) 99 xcr->cr_groups[i + 1] = IXDR_GET_INT32(buf); 100 else 101 buf++; 102 } 103 if (gid_len + 1 > NGROUPS) 104 xcr->cr_ngroups = 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_xprt->xp_verf.oa_flavor = AUTH_NULL; 124 rqst->rq_xprt->xp_verf.oa_length = 0; 125 stat = AUTH_OK; 126 done: 127 XDR_DESTROY(&xdrs); 128 129 return (stat); 130 } 131 132 133 /* 134 * Shorthand unix authenticator 135 * Looks up longhand in a cache. 136 */ 137 /*ARGSUSED*/ 138 enum auth_stat 139 _svcauth_short(rqst, msg) 140 struct svc_req *rqst; 141 struct rpc_msg *msg; 142 { 143 return (AUTH_REJECTEDCRED); 144 } 145