[df49c60] | 1 | /* |
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| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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| 3 | * unrestricted use provided that this legend is included on all tape |
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| 4 | * media and as a part of the software program in whole or part. Users |
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| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
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| 6 | * to license or distribute it to anyone else except as part of a product or |
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| 7 | * program developed by the user. |
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| 8 | * |
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| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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| 12 | * |
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| 13 | * Sun RPC is provided with no support and without any obligation on the |
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| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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| 15 | * modification or enhancement. |
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| 16 | * |
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| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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| 19 | * OR ANY PART THEREOF. |
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| 20 | * |
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| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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| 22 | * or profits or other special, indirect and consequential damages, even if |
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| 23 | * Sun has been advised of the possibility of such damages. |
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| 24 | * |
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| 25 | * Sun Microsystems, Inc. |
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| 26 | * 2550 Garcia Avenue |
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| 27 | * Mountain View, California 94043 |
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| 28 | */ |
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| 29 | |
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| 30 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 31 | /*static char *sccsid = "from: @(#)auth_unix.c 1.19 87/08/11 Copyr 1984 Sun Micro";*/ |
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| 32 | /*static char *sccsid = "from: @(#)auth_unix.c 2.2 88/08/01 4.0 RPCSRC";*/ |
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| 33 | static char *rcsid = "$FreeBSD: src/lib/libc/rpc/auth_unix.c,v 1.12 1999/12/29 05:04:16 peter Exp $"; |
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| 34 | #endif |
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| 35 | |
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| 36 | /* |
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| 37 | * auth_unix.c, Implements UNIX style authentication parameters. |
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| 38 | * |
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| 39 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 40 | * |
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| 41 | * The system is very weak. The client uses no encryption for it's |
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| 42 | * credentials and only sends null verifiers. The server sends backs |
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| 43 | * null verifiers or optionally a verifier that suggests a new short hand |
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| 44 | * for the credentials. |
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| 45 | * |
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| 46 | */ |
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| 47 | |
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| 48 | #include <stdio.h> |
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| 49 | #include <stdlib.h> |
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| 50 | #include <unistd.h> |
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| 51 | #include <string.h> |
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| 52 | |
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| 53 | #include <sys/param.h> |
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| 54 | #include <rpc/types.h> |
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| 55 | #include <rpc/xdr.h> |
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| 56 | #include <rpc/auth.h> |
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| 57 | #include <rpc/auth_unix.h> |
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| 58 | |
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| 59 | /* |
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| 60 | * Unix authenticator operations vector |
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| 61 | */ |
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[dab2d6eb] | 62 | static void authunix_nextverf(AUTH*); |
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[90d2585a] | 63 | static int authunix_marshal(AUTH*, XDR*); |
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| 64 | static int authunix_validate(AUTH*, struct opaque_auth *); |
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| 65 | static int authunix_refresh(AUTH*); |
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[dab2d6eb] | 66 | static void authunix_destroy(AUTH*); |
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[df49c60] | 67 | |
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| 68 | static struct auth_ops auth_unix_ops = { |
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| 69 | authunix_nextverf, |
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| 70 | authunix_marshal, |
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| 71 | authunix_validate, |
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| 72 | authunix_refresh, |
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| 73 | authunix_destroy |
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| 74 | }; |
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| 75 | |
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| 76 | /* |
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| 77 | * This struct is pointed to by the ah_private field of an auth_handle. |
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| 78 | */ |
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| 79 | struct audata { |
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| 80 | struct opaque_auth au_origcred; /* original credentials */ |
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| 81 | struct opaque_auth au_shcred; /* short hand cred */ |
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| 82 | u_long au_shfaults; /* short hand cache faults */ |
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| 83 | char au_marshed[MAX_AUTH_BYTES]; |
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| 84 | u_int au_mpos; /* xdr pos at end of marshed */ |
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| 85 | }; |
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| 86 | #define AUTH_PRIVATE(auth) ((struct audata *)auth->ah_private) |
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| 87 | |
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| 88 | static void marshal_new_auth(); |
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| 89 | |
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| 90 | /* |
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| 91 | * This goop is here because some servers refuse to accept a |
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| 92 | * credential with more than some number (usually 8) supplementary |
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| 93 | * groups. Blargh! |
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| 94 | */ |
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| 95 | static int authunix_maxgrouplist = 0; |
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| 96 | |
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| 97 | void |
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| 98 | set_rpc_maxgrouplist(int num) |
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| 99 | { |
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| 100 | authunix_maxgrouplist = num; |
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| 101 | } |
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| 102 | |
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| 103 | /* |
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| 104 | * Create a unix style authenticator. |
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| 105 | * Returns an auth handle with the given stuff in it. |
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| 106 | */ |
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| 107 | AUTH * |
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| 108 | authunix_create(machname, uid, gid, len, aup_gids) |
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| 109 | char *machname; |
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| 110 | int uid; |
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| 111 | int gid; |
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[dab2d6eb] | 112 | int len; |
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[df49c60] | 113 | int *aup_gids; |
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| 114 | { |
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| 115 | struct authunix_parms aup; |
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| 116 | char mymem[MAX_AUTH_BYTES]; |
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| 117 | struct timeval now; |
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| 118 | XDR xdrs; |
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| 119 | register AUTH *auth; |
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| 120 | register struct audata *au; |
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| 121 | |
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| 122 | /* |
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| 123 | * Allocate and set up auth handle |
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| 124 | */ |
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| 125 | auth = (AUTH *)mem_alloc(sizeof(*auth)); |
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| 126 | #ifndef _KERNEL |
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| 127 | if (auth == NULL) { |
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| 128 | (void)fprintf(stderr, "authunix_create: out of memory\n"); |
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| 129 | return (NULL); |
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| 130 | } |
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| 131 | #endif |
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| 132 | au = (struct audata *)mem_alloc(sizeof(*au)); |
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| 133 | #ifndef _KERNEL |
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| 134 | if (au == NULL) { |
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| 135 | (void)fprintf(stderr, "authunix_create: out of memory\n"); |
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| 136 | return (NULL); |
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| 137 | } |
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| 138 | #endif |
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| 139 | auth->ah_ops = &auth_unix_ops; |
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| 140 | auth->ah_private = (caddr_t)au; |
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| 141 | auth->ah_verf = au->au_shcred = _null_auth; |
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| 142 | au->au_shfaults = 0; |
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| 143 | |
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| 144 | /* |
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| 145 | * fill in param struct from the given params |
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| 146 | */ |
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| 147 | (void)gettimeofday(&now, (struct timezone *)0); |
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| 148 | aup.aup_time = now.tv_sec; |
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| 149 | aup.aup_machname = machname; |
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| 150 | aup.aup_uid = uid; |
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| 151 | aup.aup_gid = gid; |
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| 152 | /* GW: continuation of max group list hack */ |
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| 153 | if(authunix_maxgrouplist != 0) { |
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| 154 | aup.aup_len = ((len < authunix_maxgrouplist) ? len |
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| 155 | : authunix_maxgrouplist); |
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| 156 | } else { |
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| 157 | aup.aup_len = (u_int)len; |
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| 158 | } |
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| 159 | aup.aup_gids = aup_gids; |
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| 160 | |
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| 161 | /* |
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| 162 | * Serialize the parameters into origcred |
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| 163 | */ |
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| 164 | xdrmem_create(&xdrs, mymem, MAX_AUTH_BYTES, XDR_ENCODE); |
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| 165 | if (! xdr_authunix_parms(&xdrs, &aup)) |
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| 166 | abort(); |
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| 167 | au->au_origcred.oa_length = len = XDR_GETPOS(&xdrs); |
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| 168 | au->au_origcred.oa_flavor = AUTH_UNIX; |
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| 169 | #ifdef _KERNEL |
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| 170 | au->au_origcred.oa_base = mem_alloc((u_int) len); |
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| 171 | #else |
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| 172 | if ((au->au_origcred.oa_base = mem_alloc((u_int) len)) == NULL) { |
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| 173 | (void)fprintf(stderr, "authunix_create: out of memory\n"); |
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| 174 | return (NULL); |
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| 175 | } |
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| 176 | #endif |
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| 177 | memcpy(au->au_origcred.oa_base, mymem, (u_int)len); |
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| 178 | |
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| 179 | /* |
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| 180 | * set auth handle to reflect new cred. |
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| 181 | */ |
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| 182 | auth->ah_cred = au->au_origcred; |
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| 183 | marshal_new_auth(auth); |
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| 184 | return (auth); |
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| 185 | } |
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| 186 | |
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| 187 | /* |
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| 188 | * Returns an auth handle with parameters determined by doing lots of |
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| 189 | * syscalls. |
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| 190 | */ |
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| 191 | AUTH * |
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| 192 | authunix_create_default() |
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| 193 | { |
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| 194 | register int len; |
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| 195 | char machname[MAX_MACHINE_NAME + 1]; |
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| 196 | register int uid; |
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| 197 | register int gid; |
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| 198 | int gids[NGRPS]; |
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| 199 | int i; |
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| 200 | gid_t real_gids[NGROUPS]; |
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| 201 | |
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| 202 | if (gethostname(machname, MAX_MACHINE_NAME) == -1) |
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| 203 | abort(); |
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| 204 | machname[MAX_MACHINE_NAME] = 0; |
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| 205 | uid = (int)geteuid(); |
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| 206 | gid = (int)getegid(); |
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| 207 | if ((len = getgroups(NGROUPS, real_gids)) < 0) |
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| 208 | abort(); |
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| 209 | if(len > NGRPS) len = NGRPS; /* GW: turn `gid_t's into `int's */ |
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| 210 | for(i = 0; i < len; i++) { |
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| 211 | gids[i] = (int)real_gids[i]; |
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| 212 | } |
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| 213 | return (authunix_create(machname, uid, gid, len, gids)); |
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| 214 | } |
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| 215 | |
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| 216 | /* |
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| 217 | * authunix operations |
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| 218 | */ |
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| 219 | |
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| 220 | static void |
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[dab2d6eb] | 221 | authunix_nextverf(AUTH *auth) |
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[df49c60] | 222 | { |
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| 223 | /* no action necessary */ |
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| 224 | } |
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| 225 | |
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[90d2585a] | 226 | static int |
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[dab2d6eb] | 227 | authunix_marshal(AUTH *auth, XDR *xdrs) |
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[df49c60] | 228 | { |
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[dab2d6eb] | 229 | struct audata *au = AUTH_PRIVATE(auth); |
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[df49c60] | 230 | |
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| 231 | return (XDR_PUTBYTES(xdrs, au->au_marshed, au->au_mpos)); |
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| 232 | } |
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| 233 | |
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[90d2585a] | 234 | static int |
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[dab2d6eb] | 235 | authunix_validate( AUTH *auth, struct opaque_auth *verf ) |
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[df49c60] | 236 | { |
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| 237 | register struct audata *au; |
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| 238 | XDR xdrs; |
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| 239 | |
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[dab2d6eb] | 240 | if (verf->oa_flavor == AUTH_SHORT) { |
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[df49c60] | 241 | au = AUTH_PRIVATE(auth); |
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[dab2d6eb] | 242 | xdrmem_create(&xdrs, verf->oa_base, verf->oa_length, XDR_DECODE); |
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[df49c60] | 243 | |
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| 244 | if (au->au_shcred.oa_base != NULL) { |
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| 245 | mem_free(au->au_shcred.oa_base, |
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| 246 | au->au_shcred.oa_length); |
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| 247 | au->au_shcred.oa_base = NULL; |
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| 248 | } |
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| 249 | if (xdr_opaque_auth(&xdrs, &au->au_shcred)) { |
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| 250 | auth->ah_cred = au->au_shcred; |
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| 251 | } else { |
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| 252 | xdrs.x_op = XDR_FREE; |
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| 253 | (void)xdr_opaque_auth(&xdrs, &au->au_shcred); |
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| 254 | au->au_shcred.oa_base = NULL; |
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| 255 | auth->ah_cred = au->au_origcred; |
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| 256 | } |
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| 257 | marshal_new_auth(auth); |
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| 258 | } |
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| 259 | return (TRUE); |
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| 260 | } |
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| 261 | |
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[90d2585a] | 262 | static int |
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[dab2d6eb] | 263 | authunix_refresh(AUTH *auth) |
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[df49c60] | 264 | { |
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[dab2d6eb] | 265 | struct audata *au = AUTH_PRIVATE(auth); |
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[df49c60] | 266 | struct authunix_parms aup; |
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| 267 | struct timeval now; |
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| 268 | XDR xdrs; |
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[dab2d6eb] | 269 | int stat; |
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[df49c60] | 270 | |
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| 271 | if (auth->ah_cred.oa_base == au->au_origcred.oa_base) { |
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| 272 | /* there is no hope. Punt */ |
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| 273 | return (FALSE); |
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| 274 | } |
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| 275 | au->au_shfaults ++; |
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| 276 | |
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| 277 | /* first deserialize the creds back into a struct authunix_parms */ |
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| 278 | aup.aup_machname = NULL; |
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| 279 | aup.aup_gids = (int *)NULL; |
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| 280 | xdrmem_create(&xdrs, au->au_origcred.oa_base, |
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| 281 | au->au_origcred.oa_length, XDR_DECODE); |
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| 282 | stat = xdr_authunix_parms(&xdrs, &aup); |
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| 283 | if (! stat) |
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| 284 | goto done; |
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| 285 | |
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| 286 | /* update the time and serialize in place */ |
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| 287 | (void)gettimeofday(&now, (struct timezone *)0); |
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| 288 | aup.aup_time = now.tv_sec; |
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| 289 | xdrs.x_op = XDR_ENCODE; |
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| 290 | XDR_SETPOS(&xdrs, 0); |
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| 291 | stat = xdr_authunix_parms(&xdrs, &aup); |
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| 292 | if (! stat) |
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| 293 | goto done; |
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| 294 | auth->ah_cred = au->au_origcred; |
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| 295 | marshal_new_auth(auth); |
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| 296 | done: |
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| 297 | /* free the struct authunix_parms created by deserializing */ |
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| 298 | xdrs.x_op = XDR_FREE; |
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| 299 | (void)xdr_authunix_parms(&xdrs, &aup); |
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| 300 | XDR_DESTROY(&xdrs); |
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| 301 | return (stat); |
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| 302 | } |
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| 303 | |
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| 304 | static void |
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[dab2d6eb] | 305 | authunix_destroy(AUTH *auth) |
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[df49c60] | 306 | { |
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[dab2d6eb] | 307 | struct audata *au = AUTH_PRIVATE(auth); |
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[df49c60] | 308 | |
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| 309 | mem_free(au->au_origcred.oa_base, au->au_origcred.oa_length); |
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| 310 | |
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| 311 | if (au->au_shcred.oa_base != NULL) |
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| 312 | mem_free(au->au_shcred.oa_base, au->au_shcred.oa_length); |
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| 313 | |
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| 314 | mem_free(auth->ah_private, sizeof(struct audata)); |
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| 315 | |
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| 316 | if (auth->ah_verf.oa_base != NULL) |
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| 317 | mem_free(auth->ah_verf.oa_base, auth->ah_verf.oa_length); |
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| 318 | |
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| 319 | mem_free((caddr_t)auth, sizeof(*auth)); |
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| 320 | } |
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| 321 | |
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| 322 | /* |
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| 323 | * Marshals (pre-serializes) an auth struct. |
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| 324 | * sets private data, au_marshed and au_mpos |
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| 325 | */ |
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| 326 | static void |
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[dab2d6eb] | 327 | marshal_new_auth(AUTH *auth) |
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[df49c60] | 328 | { |
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| 329 | XDR xdr_stream; |
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[dab2d6eb] | 330 | XDR *xdrs = &xdr_stream; |
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| 331 | struct audata *au = AUTH_PRIVATE(auth); |
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[df49c60] | 332 | |
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| 333 | xdrmem_create(xdrs, au->au_marshed, MAX_AUTH_BYTES, XDR_ENCODE); |
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| 334 | if ((! xdr_opaque_auth(xdrs, &(auth->ah_cred))) || |
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| 335 | (! xdr_opaque_auth(xdrs, &(auth->ah_verf)))) { |
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| 336 | perror("auth_none.c - Fatal marshalling problem"); |
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| 337 | } else { |
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| 338 | au->au_mpos = XDR_GETPOS(xdrs); |
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| 339 | } |
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| 340 | XDR_DESTROY(xdrs); |
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| 341 | } |
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