[12582] | 1 | /* Copyright 1998 by the Massachusetts Institute of Technology. |
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| 2 | * |
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| 3 | * Permission to use, copy, modify, and distribute this |
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| 4 | * software and its documentation for any purpose and without |
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| 5 | * fee is hereby granted, provided that the above copyright |
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| 6 | * notice appear in all copies and that both that copyright |
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| 7 | * notice and this permission notice appear in supporting |
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| 8 | * documentation, and that the name of M.I.T. not be used in |
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| 9 | * advertising or publicity pertaining to distribution of the |
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| 10 | * software without specific, written prior permission. |
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| 11 | * M.I.T. makes no representations about the suitability of |
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| 12 | * this software for any purpose. It is provided "as is" |
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| 13 | * without express or implied warranty. |
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| 14 | */ |
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| 15 | |
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| 16 | /* This file is part of liblocker. It implements NFS lockers. */ |
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| 17 | |
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[22520] | 18 | static const char rcsid[] = "$Id: nfs.c,v 1.5 2006-07-25 23:29:09 ghudson Exp $"; |
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[12582] | 19 | |
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[24069] | 20 | #ifdef ENABLE_NFS |
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| 21 | |
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[12582] | 22 | #include <sys/types.h> |
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| 23 | #include <sys/socket.h> |
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| 24 | #include <sys/stat.h> |
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| 25 | #include <sys/utsname.h> |
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| 26 | |
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| 27 | #include <ctype.h> |
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| 28 | #include <errno.h> |
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| 29 | #include <netdb.h> |
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| 30 | #include <pwd.h> |
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| 31 | #include <stdlib.h> |
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| 32 | #include <string.h> |
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| 33 | #include <unistd.h> |
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| 34 | |
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| 35 | #include <rpc/rpc.h> |
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| 36 | #ifdef NEED_SYS_FS_NFS_H |
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| 37 | #include <sys/fs/nfs.h> |
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| 38 | #endif |
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| 39 | #include <rpcsvc/mount.h> |
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| 40 | |
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| 41 | #include <krb.h> |
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| 42 | |
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[24069] | 43 | #endif /* ENABLE_NFS */ |
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| 44 | |
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[12582] | 45 | #include "locker.h" |
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| 46 | #include "locker_private.h" |
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| 47 | |
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[24069] | 48 | #ifdef ENABLE_NFS |
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[12582] | 49 | static bool_t xdr_krbtkt(XDR *xdrs, KTEXT authp); |
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[24069] | 50 | #endif /* ENABLE_NFS */ |
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[12582] | 51 | |
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| 52 | static int nfs_parse(locker_context context, char *name, char *desc, |
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| 53 | char *mountpoint, locker_attachent **at); |
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| 54 | static int nfs_auth(locker_context context, locker_attachent *at, |
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| 55 | int mode, int op); |
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[12783] | 56 | static int nfs_zsubs(locker_context context, locker_attachent *at); |
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[12582] | 57 | |
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| 58 | struct locker_ops locker__nfs_ops = { |
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| 59 | "NFS", |
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| 60 | LOCKER_FS_NEEDS_MOUNTDIR, |
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| 61 | nfs_parse, |
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| 62 | locker__mount, |
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| 63 | locker__unmount, |
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| 64 | nfs_auth, |
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| 65 | nfs_zsubs |
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| 66 | }; |
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| 67 | |
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| 68 | static int nfs_parse(locker_context context, char *name, char *desc, |
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| 69 | char *mountpoint, locker_attachent **atp) |
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| 70 | { |
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[24069] | 71 | #ifdef ENABLE_NFS |
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[12582] | 72 | locker_attachent *at; |
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| 73 | struct hostent *h; |
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| 74 | char *dup; |
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| 75 | char *p, *host, *dir, *lasts = NULL; |
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| 76 | int status; |
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| 77 | |
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| 78 | at = locker__new_attachent(context, &locker__nfs_ops); |
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| 79 | if (!at) |
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| 80 | return LOCKER_ENOMEM; |
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| 81 | |
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| 82 | dup = strdup(desc); |
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| 83 | if (!dup) |
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| 84 | goto mem_error; |
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| 85 | |
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| 86 | if (!name) |
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| 87 | { |
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| 88 | /* It's an explicit description: host:path. */ |
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| 89 | |
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| 90 | at->name = strdup(desc); |
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| 91 | if (!at->name) |
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| 92 | goto mem_error; |
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| 93 | |
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| 94 | if (!(p = strchr(dup, ':'))) |
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| 95 | { |
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| 96 | locker__error(context, "%s: No \":\" in description.\n", desc); |
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| 97 | status = LOCKER_EPARSE; |
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| 98 | goto cleanup; |
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| 99 | } |
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| 100 | |
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| 101 | *p = '\0'; |
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| 102 | host = dup; |
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| 103 | dir = p + 1; |
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| 104 | at->mode = LOCKER_AUTH_READWRITE; |
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| 105 | } |
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| 106 | else |
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| 107 | { |
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| 108 | /* A hesiod NFS description looks like: |
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| 109 | * NFS /u1/bitbucket JASON.MIT.EDU w /mit/bitbucket |
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| 110 | */ |
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| 111 | |
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| 112 | at->name = strdup(name); |
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| 113 | if (!at->name) |
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| 114 | goto mem_error; |
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| 115 | |
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| 116 | /* Skip "NFS". */ |
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| 117 | if (!strtok_r(dup, " ", &lasts)) |
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| 118 | goto parse_error; |
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| 119 | |
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| 120 | /* Directory on remote host */ |
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| 121 | dir = strtok_r(NULL, " ", &lasts); |
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| 122 | if (!dir) |
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| 123 | goto parse_error; |
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| 124 | |
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| 125 | /* Remote host */ |
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| 126 | host = strtok_r(NULL, " ", &lasts); |
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| 127 | if (!host) |
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| 128 | goto parse_error; |
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| 129 | |
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| 130 | /* Mount mode */ |
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| 131 | p = strtok_r(NULL, " ", &lasts); |
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| 132 | if (!p || *(p + 1)) |
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| 133 | goto parse_error; |
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| 134 | switch (*p) |
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| 135 | { |
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| 136 | case 'r': |
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| 137 | at->mode = LOCKER_AUTH_READONLY; |
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| 138 | break; |
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| 139 | case 'm': |
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| 140 | at->mode = LOCKER_AUTH_MAYBE_READWRITE; |
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| 141 | break; |
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| 142 | case 'w': |
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| 143 | at->mode = LOCKER_AUTH_READWRITE; |
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| 144 | break; |
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| 145 | case 'n': |
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| 146 | at->mode = LOCKER_AUTH_NONE; |
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| 147 | break; |
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| 148 | default: |
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| 149 | locker__error(context, "%s: Unrecognized mount option '%c' in\n" |
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| 150 | "\"%s\".\n", name, *p, desc); |
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| 151 | return LOCKER_EPARSE; |
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| 152 | } |
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| 153 | |
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| 154 | /* Mountpoint */ |
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| 155 | p = strtok_r(NULL, " ", &lasts); |
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| 156 | if (!p) |
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| 157 | goto parse_error; |
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| 158 | if (mountpoint) |
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| 159 | at->mountpoint = strdup(mountpoint); |
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| 160 | else |
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| 161 | at->mountpoint = strdup(p); |
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| 162 | if (!at->mountpoint) |
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| 163 | goto mem_error; |
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| 164 | } |
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| 165 | |
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| 166 | /* Canonicalize hostname and build hostdir. */ |
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| 167 | h = gethostbyname(host); |
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| 168 | if (!h) |
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| 169 | { |
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| 170 | locker__error(context, "%s: Could not resolve hostname %s.\n", |
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| 171 | name ? name : desc, host); |
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| 172 | status = LOCKER_EPARSE; |
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| 173 | goto cleanup; |
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| 174 | } |
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| 175 | memcpy(&at->hostaddr, h->h_addr, sizeof(at->hostaddr)); |
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| 176 | |
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| 177 | at->hostdir = malloc(strlen(h->h_name) + strlen(dir) + 2); |
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| 178 | if (!at->hostdir) |
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| 179 | goto mem_error; |
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| 180 | sprintf(at->hostdir, "%s:%s", h->h_name, dir); |
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| 181 | |
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| 182 | if (!at->mountpoint) |
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| 183 | { |
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| 184 | if (mountpoint) |
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| 185 | at->mountpoint = strdup(mountpoint); |
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| 186 | else |
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| 187 | { |
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| 188 | /* Generate a default mountpoint. This defaults to |
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| 189 | * /hostname/hostdir where "hostname" is the canonical |
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| 190 | * hostname, in lowercase, up to the first dot, and hostdir |
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| 191 | * is the path to the NFS locker on that host. BUT, if |
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| 192 | * nfs_mount_dir is set, its value is prepended, and if |
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| 193 | * nfs_root_hack is set, "root" is appended if hostdir is |
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| 194 | * "/". |
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| 195 | */ |
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| 196 | char *mount_dir = context->nfs_mount_dir ? |
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| 197 | context->nfs_mount_dir : ""; |
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| 198 | int root_hack = context->nfs_root_hack && !strcmp(dir, "/"); |
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[13272] | 199 | int hostlen = strcspn(host, "."); |
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[12582] | 200 | |
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| 201 | at->mountpoint = malloc(strlen(mount_dir) + 1 + hostlen + |
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| 202 | strlen(dir) + (root_hack ? 5 : 1)); |
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| 203 | if (at->mountpoint) |
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| 204 | { |
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| 205 | sprintf(at->mountpoint, "%s/%.*s%s%s", mount_dir, hostlen, |
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[13272] | 206 | host, dir, root_hack ? "root" : ""); |
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[12582] | 207 | } |
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| 208 | |
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| 209 | for (p = at->mountpoint + strlen(mount_dir) + 1; *p != '/'; p++) |
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| 210 | *p = tolower(*p); |
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| 211 | } |
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| 212 | if (!at->mountpoint) |
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| 213 | goto mem_error; |
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| 214 | } |
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| 215 | |
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[13171] | 216 | status = locker__canonicalize_path(context, LOCKER_CANON_CHECK_ALL, |
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| 217 | &(at->mountpoint), &(at->buildfrom)); |
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[12582] | 218 | if (status != LOCKER_SUCCESS) |
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| 219 | goto cleanup; |
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| 220 | |
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| 221 | free(dup); |
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| 222 | *atp = at; |
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| 223 | return LOCKER_SUCCESS; |
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| 224 | |
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| 225 | mem_error: |
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| 226 | locker__error(context, "Out of memory parsing locker description.\n"); |
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| 227 | status = LOCKER_ENOMEM; |
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| 228 | goto cleanup; |
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| 229 | |
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| 230 | parse_error: |
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| 231 | locker__error(context, "Could not parse locker description " |
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| 232 | "\"%s\".\n", desc); |
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| 233 | status = LOCKER_EPARSE; |
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| 234 | |
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| 235 | cleanup: |
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| 236 | free(dup); |
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| 237 | locker_free_attachent(context, at); |
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| 238 | return status; |
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[24069] | 239 | #else /* ENABLE_NFS */ |
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| 240 | return LOCKER_EPARSE; |
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| 241 | #endif /* ENABLE_NFS */ |
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[12582] | 242 | } |
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| 243 | |
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| 244 | static int nfs_auth(locker_context context, locker_attachent *at, |
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| 245 | int mode, int op) |
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| 246 | { |
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[24069] | 247 | #ifdef ENABLE_NFS |
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[12582] | 248 | int status, len; |
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| 249 | char *host; |
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| 250 | |
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| 251 | len = strcspn(at->hostdir, ":"); |
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| 252 | host = malloc(len + 1); |
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| 253 | if (!host) |
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| 254 | { |
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| 255 | locker__error(context, "Out of memory authenticating to host.\n"); |
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| 256 | return LOCKER_ENOMEM; |
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| 257 | } |
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| 258 | memcpy(host, at->hostdir, len); |
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| 259 | host[len] = '\0'; |
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| 260 | |
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| 261 | status = locker_auth_to_host(context, at->name, host, op); |
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| 262 | free(host); |
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| 263 | return status; |
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[24069] | 264 | #else /* ENABLE_NFS */ |
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| 265 | return LOCKER_EAUTH; |
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| 266 | #endif /* ENABLE_NFS */ |
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[12582] | 267 | } |
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| 268 | |
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| 269 | int locker_auth_to_host(locker_context context, char *name, char *host, |
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| 270 | int op) |
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| 271 | { |
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[24069] | 272 | #ifdef ENABLE_NFS |
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[12582] | 273 | int status, len; |
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| 274 | struct timeval timeout; |
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| 275 | CLIENT *cl; |
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| 276 | struct utsname uts; |
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| 277 | struct passwd *pw; |
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| 278 | gid_t gids[NGRPS]; |
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| 279 | KTEXT_ST authent; |
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| 280 | enum clnt_stat rpc_stat; |
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| 281 | |
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| 282 | if (op == LOCKER_AUTH_PURGE && !context->trusted) |
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| 283 | { |
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| 284 | locker__error(context, "%s: You are not allowed to use the " |
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| 285 | "'purge all host mappings' option.\n", name); |
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| 286 | return LOCKER_EPERM; |
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| 287 | } |
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| 288 | |
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| 289 | timeout.tv_usec = 0; |
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| 290 | timeout.tv_sec = 20; |
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| 291 | |
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| 292 | /* Get an RPC handle. */ |
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| 293 | cl = clnt_create(host, MOUNTPROG, MOUNTVERS, "udp"); |
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| 294 | if (!cl) |
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| 295 | { |
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| 296 | locker__error(context, "%s: server %s not responding.\n", name, host); |
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| 297 | return LOCKER_EATTACH; |
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| 298 | } |
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| 299 | auth_destroy(cl->cl_auth); |
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| 300 | |
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| 301 | /* Create authunix authentication. */ |
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| 302 | uname(&uts); |
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| 303 | pw = getpwuid(context->user); |
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| 304 | len = getgroups(NGRPS, gids); |
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| 305 | cl->cl_auth = authunix_create(uts.nodename, context->user, |
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| 306 | pw ? pw->pw_gid : LOCKER_DEFAULT_GID, |
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| 307 | len, gids); |
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| 308 | |
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| 309 | /* Mapping and user purging are the only Kerberos-authenticated |
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| 310 | * functions. |
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| 311 | */ |
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| 312 | if (op == LOCKER_AUTH_AUTHENTICATE || op == LOCKER_AUTH_PURGEUSER) |
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| 313 | { |
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| 314 | char *realm, *instance, *src, *dst; |
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| 315 | |
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| 316 | realm = (char *) krb_realmofhost(host); |
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| 317 | instance = malloc(strcspn(host, ".") + 1); |
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| 318 | |
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| 319 | for (src = host, dst = instance; *src && *src != '.'; ) |
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| 320 | *dst++ = tolower(*src++); |
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| 321 | *dst = '\0'; |
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| 322 | |
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| 323 | status = krb_mk_req(&authent, LOCKER_NFS_KSERVICE, instance, realm, 0); |
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| 324 | free(instance); |
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| 325 | if (status != KSUCCESS) |
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| 326 | { |
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| 327 | auth_destroy(cl->cl_auth); |
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| 328 | clnt_destroy(cl); |
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| 329 | if (status == KDC_PR_UNKNOWN) |
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| 330 | { |
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| 331 | locker__error(context, "%s: (warning) Host %s isn't registered " |
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| 332 | "with Kerberos.%s\n", name, host, |
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| 333 | op == LOCKER_AUTH_AUTHENTICATE ? |
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| 334 | " Mapping failed." : ""); |
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| 335 | return LOCKER_SUCCESS; |
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| 336 | } |
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| 337 | else |
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| 338 | { |
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| 339 | locker__error(context, "%s: Could not get Kerberos ticket for " |
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| 340 | "NFS authentication:\n%s.\n", name, |
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| 341 | krb_err_txt[status]); |
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| 342 | return LOCKER_EAUTH; |
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| 343 | } |
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| 344 | } |
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| 345 | |
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[22520] | 346 | rpc_stat = clnt_call(cl, op, (xdrproc_t)xdr_krbtkt, (caddr_t)&authent, |
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| 347 | (xdrproc_t)xdr_void, 0, timeout); |
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[12582] | 348 | } |
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| 349 | else |
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[22520] | 350 | rpc_stat = clnt_call(cl, op, (xdrproc_t)xdr_void, 0, (xdrproc_t)xdr_void, |
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| 351 | 0, timeout); |
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[12582] | 352 | |
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| 353 | auth_destroy(cl->cl_auth); |
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| 354 | clnt_destroy(cl); |
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| 355 | |
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| 356 | if (rpc_stat != RPC_SUCCESS) |
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| 357 | { |
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| 358 | switch (rpc_stat) |
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| 359 | { |
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| 360 | case RPC_TIMEDOUT: |
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| 361 | locker__error(context, "%s: Timeout while contacting mount " |
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| 362 | "daemon on %s.\n", name, host); |
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| 363 | return LOCKER_EATTACH; |
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| 364 | |
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| 365 | case RPC_PMAPFAILURE: |
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| 366 | case RPC_PROGUNAVAIL: |
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| 367 | case RPC_PROGNOTREGISTERED: |
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| 368 | locker__error(context, "%s: No mount daemon on %s.\n", name, host); |
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| 369 | return LOCKER_EATTACH; |
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| 370 | |
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| 371 | case RPC_AUTHERROR: |
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| 372 | locker__error(context, "%s: Authentication failed to host %s.\n", |
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| 373 | name, host); |
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| 374 | return LOCKER_EAUTH; |
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| 375 | |
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| 376 | case RPC_PROCUNAVAIL: |
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| 377 | locker__error(context, "%s: (warning) Mount daemon on %s doesn't " |
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| 378 | "understand UID maps.\n", name, host); |
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| 379 | return LOCKER_SUCCESS; |
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| 380 | |
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| 381 | default: |
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| 382 | locker__error(context, "%s: System error contacting server %s.\n", |
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| 383 | name, host); |
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| 384 | return LOCKER_EAUTH; |
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| 385 | } |
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| 386 | } |
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| 387 | |
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| 388 | return LOCKER_SUCCESS; |
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[24069] | 389 | #else /* ENABLE_NFS */ |
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| 390 | return LOCKER_EAUTH; |
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| 391 | #endif /* ENABLE_NFS */ |
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[12582] | 392 | } |
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| 393 | |
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| 394 | /* XDR for sending a Kerberos ticket - sends the whole KTEXT block, |
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| 395 | * but this is very old lossage, and nothing that can really be fixed |
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| 396 | * now. |
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| 397 | */ |
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| 398 | |
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[24069] | 399 | #ifdef ENABLE_NFS |
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| 400 | |
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[12582] | 401 | static bool_t xdr_krbtkt(XDR *xdrs, KTEXT authp) |
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| 402 | { |
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| 403 | KTEXT_ST auth; |
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| 404 | |
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| 405 | auth = *authp; |
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| 406 | auth.length = htonl(authp->length); |
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| 407 | return xdr_opaque(xdrs, (caddr_t)&auth, sizeof(KTEXT_ST)); |
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| 408 | } |
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| 409 | |
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[24069] | 410 | #endif /* ENABLE_NFS */ |
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| 411 | |
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[12783] | 412 | static int nfs_zsubs(locker_context context, locker_attachent *at) |
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[12582] | 413 | { |
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[24069] | 414 | #ifdef ENABLE_NFS |
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[12582] | 415 | int len, status; |
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[12783] | 416 | char *subs[2]; |
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[12582] | 417 | |
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| 418 | subs[0] = at->hostdir; |
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| 419 | |
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| 420 | len = strchr(at->hostdir, ':') - at->hostdir; |
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| 421 | subs[1] = malloc(len + 1); |
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| 422 | if (!subs[1]) |
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| 423 | { |
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| 424 | free(subs[0]); |
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| 425 | free(subs); |
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| 426 | locker__error(context, "Out of memory getting Zephyr subscriptions.\n"); |
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| 427 | return LOCKER_ENOMEM; |
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| 428 | } |
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| 429 | memcpy(subs[1], at->hostdir, len); |
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| 430 | subs[1][len] = '\0'; |
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| 431 | |
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[12783] | 432 | status = locker__add_zsubs(context, subs, 2); |
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[12582] | 433 | free(subs[1]); |
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| 434 | return status; |
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[24069] | 435 | #else /* ENABLE_NFS */ |
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| 436 | return LOCKER_EPARSE; |
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| 437 | #endif |
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[12582] | 438 | } |
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