/* $NetBSD: info_passwd.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. * * * File: am-utils/amd/info_passwd.c * */ /* * Get info from password "file" * * This is experimental and probably doesn't do what you expect. */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include #define PASSWD_MAP "/etc/passwd" /* forward declarations */ int passwd_init(mnt_map *m, char *map, time_t *tp); int passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp); /* * Nothing to probe - check the map name is PASSWD_MAP. */ int passwd_init(mnt_map *m, char *map, time_t *tp) { *tp = 0; /* * Recognize the old format "PASSWD_MAP" * Uses default return string * "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}" */ if (STREQ(map, PASSWD_MAP)) return 0; /* * Recognize the new format "PASSWD_MAP:pval-format" */ if (!NSTREQ(map, PASSWD_MAP, sizeof(PASSWD_MAP) - 1)) return ENOENT; if (map[sizeof(PASSWD_MAP)-1] != ':') return ENOENT; return 0; } /* * Grab the entry via the getpwname routine * Modify time is ignored by passwd - XXX */ int passwd_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp) { char *dir = NULL; struct passwd *pw; if (STREQ(key, "/defaults")) { *pval = xstrdup("type:=nfs"); return 0; } pw = getpwnam(key); if (pw) { /* * We chop the home directory up as follows: * /anydir/dom1/dom2/dom3/user * * and return * rfs:=/anydir/dom3;rhost:=dom3.dom2.dom1;sublink:=user * and now have * var0:=pw-prefix:=anydir * var1:=pw-rhost:=dom3.dom2.dom1 * var2:=pw-user:=user * var3:=pw-home:=/anydir/dom1/dom2/dom3/user * * This allows cross-domain entries in your passwd file. * ... but forget about security! */ char *user; char *p, *q; char val[MAXPATHLEN]; char rhost[MAXHOSTNAMELEN]; dir = xstrdup(pw->pw_dir); /* * Find user name. If no / then Invalid... */ user = strrchr(dir, '/'); if (!user) goto enoent; *user++ = '\0'; /* * Find start of host "path". If no / then Invalid... */ p = strchr(dir + 1, '/'); if (!p) goto enoent; *p++ = '\0'; /* * At this point, p is dom1/dom2/dom3 * Copy, backwards, into rhost replacing * / with . */ rhost[0] = '\0'; do { q = strrchr(p, '/'); if (q) { xstrlcat(rhost, q + 1, sizeof(rhost)); xstrlcat(rhost, ".", sizeof(rhost)); *q = '\0'; } else { xstrlcat(rhost, p, sizeof(rhost)); } } while (q); /* * Sanity check */ if (*rhost == '\0' || *user == '\0' || *dir == '\0') goto enoent; /* * Make up return string */ q = strchr(rhost, '.'); if (q) *q = '\0'; p = strchr(map, ':'); if (p) p++; else p = "type:=nfs;rfs:=/${var0}/${var1};rhost:=${var1};sublink:=${var2};fs:=${autodir}${var3}"; xsnprintf(val, sizeof(val), "var0:=%s;var1:=%s;var2:=%s;var3:=%s;%s", dir+1, rhost, user, pw->pw_dir, p); dlog("passwd_search: map=%s key=%s -> %s", map, key, val); if (q) *q = '.'; *pval = xstrdup(val); return 0; } enoent: XFREE(dir); return ENOENT; }