chpass/pw_yp.c

   1 /*
   2  * Copyright (c) 1995
   3  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by Bill Paul.
  16  * 4. Neither the name of the author nor the names of any co-contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  *
  32  * NIS interface routines for chpass
  33  *
  34  * Written by Bill Paul <wpaul@ctr.columbia.edu>
  35  * Center for Telecommunications Research
  36  * Columbia University, New York City
  37  *
  38  *      $Id: pw_yp.c,v 1.11 1997/07/29 15:45:36 wpaul Exp $
  39  */
  40
  41 #ifdef YP
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <netdb.h>
  46 #include <time.h>
  47 #include <sys/types.h>
  48 #include <sys/stat.h>
  49 #include <pwd.h>
  50 #include <errno.h>
  51 #include <err.h>
  52 #include <unistd.h>
  53 #include <db.h>
  54 #include <fcntl.h>
  55 #include <utmp.h>
  56 #include <sys/types.h>
  57 #include <sys/stat.h>
  58 #include <sys/param.h>
  59 #include <limits.h>
  60 #include <rpc/rpc.h>
  61 #include <rpcsvc/yp.h>
  62 struct dom_binding {};
  63 #include <rpcsvc/ypclnt.h>
  64 #include <rpcsvc/yppasswd.h>
  65 #include <pw_util.h>
  66 #include "pw_yp.h"
  67 #include "ypxfr_extern.h"
  68 #include "yppasswd_private.h"
  69
  70 #define PERM_SECURE (S_IRUSR|S_IWUSR)
  71 static HASHINFO openinfo = {
  72         4096,           /* bsize */
  73         32,             /* ffactor */
  74         256,            /* nelem */
  75         2048 * 1024,    /* cachesize */
  76         NULL,           /* hash */
  77         0,              /* lorder */
  78 };
  79
  80 int force_old = 0;
  81 int _use_yp = 0;
  82 int suser_override = 0;
  83 int yp_in_pw_file = 0;
  84 char *yp_domain = NULL;
  85 char *yp_server = NULL;
  86
  87 extern char *tempname;
  88
  89 /* Save the local and NIS password information */
  90 struct passwd local_password;
  91 struct passwd yp_password;
  92
  93 void copy_yp_pass(p, x, m)
  94 char *p;
  95 int x, m;
  96 {
  97         register char *t, *s = p;
  98         static char *buf;
  99
 100         yp_password.pw_fields = 0;
 101
 102         buf = (char *)realloc(buf, m + 10);
 103         bzero(buf, m + 10);
 104
 105         /* Turn all colons into NULLs */
 106         while (strchr(s, ':')) {
 107                 s = (strchr(s, ':') + 1);
 108                 *(s - 1)= '\0';
 109         }
 110
 111         t = buf;
 112 #define EXPAND(e)       e = t; while ((*t++ = *p++));
 113         EXPAND(yp_password.pw_name);
 114         yp_password.pw_fields |= _PWF_NAME;
 115         EXPAND(yp_password.pw_passwd);
 116         yp_password.pw_fields |= _PWF_PASSWD;
 117         yp_password.pw_uid = atoi(p);
 118         p += (strlen(p) + 1);
 119         yp_password.pw_fields |= _PWF_UID;
 120         yp_password.pw_gid = atoi(p);
 121         p += (strlen(p) + 1);
 122         yp_password.pw_fields |= _PWF_GID;
 123         if (x) {
 124                 EXPAND(yp_password.pw_class);
 125                 yp_password.pw_fields |= _PWF_CLASS;
 126                 yp_password.pw_change = atol(p);
 127                 p += (strlen(p) + 1);
 128                 yp_password.pw_fields |= _PWF_CHANGE;
 129                 yp_password.pw_expire = atol(p);
 130                 p += (strlen(p) + 1);
 131                 yp_password.pw_fields |= _PWF_EXPIRE;
 132         }
 133         EXPAND(yp_password.pw_gecos);
 134         yp_password.pw_fields |= _PWF_GECOS;
 135         EXPAND(yp_password.pw_dir);
 136         yp_password.pw_fields |= _PWF_DIR;
 137         EXPAND(yp_password.pw_shell);
 138         yp_password.pw_fields |= _PWF_SHELL;
 139
 140         return;
 141 }
 142
 143 void copy_local_pass(p,m)
 144 char *p;
 145 int m;
 146 {
 147         register char *t;
 148         static char *buf;
 149
 150         buf = (char *)realloc(buf, m + 10);
 151         bzero(buf, m + 10);
 152
 153         t = buf;
 154         EXPAND(local_password.pw_name);
 155         EXPAND(local_password.pw_passwd);
 156         bcopy(p, (char *)&local_password.pw_uid, sizeof(int));
 157         p += sizeof(int);
 158         bcopy(p, (char *)&local_password.pw_gid, sizeof(int));
 159         p += sizeof(int);
 160         bcopy(p, (char *)&local_password.pw_change, sizeof(time_t));
 161         p += sizeof(time_t);
 162         EXPAND(local_password.pw_class);
 163         EXPAND(local_password.pw_gecos);
 164         EXPAND(local_password.pw_dir);
 165         EXPAND(local_password.pw_shell);
 166         bcopy(p, (char *)&local_password.pw_expire, sizeof(time_t));
 167         p += sizeof(time_t);
 168         bcopy(p, (char *)&local_password.pw_fields, sizeof local_password.pw_fields);
 169         p += sizeof local_password.pw_fields;
 170
 171         return;
 172 }
 173
 174 /*
 175  * It is not mandatory that an NIS master server also be a client.
 176  * However, if the NIS master is not configured as a client, then the
 177  * domain name will not be set and ypbind will not be running, so we
 178  * will be unable to use the ypclnt routines inside libc. We therefore
 179  * need our own magic version of yp_match() which we can use in any
 180  * environment.
 181  */
 182 static int my_yp_match(server, domain, map, key, keylen, result, resultlen)
 183         char *server;
 184         char *domain;
 185         char *map;
 186         char *key;
 187         unsigned long keylen;
 188         char **result;
 189         unsigned long *resultlen;
 190 {
 191         ypreq_key ypkey;
 192         ypresp_val *ypval;
 193         CLIENT *clnt;
 194         static char buf[YPMAXRECORD + 2];
 195
 196         bzero((char *)buf, sizeof(buf));
 197
 198         if ((clnt = clnt_create(server, YPPROG,YPVERS,"udp")) == NULL) {
 199                 warnx("failed to create UDP handle: %s",
 200                                         clnt_spcreateerror(server));
 201                 pw_error(tempname, 0, 1);
 202         }
 203
 204         ypkey.domain = domain;
 205         ypkey.map = map;
 206         ypkey.key.keydat_len = keylen;
 207         ypkey.key.keydat_val = key;
 208
 209         if ((ypval = ypproc_match_2(&ypkey, clnt)) == NULL) {
 210                 clnt_destroy(clnt);
 211                 warnx("%s",clnt_sperror(clnt,"YPPROC_MATCH failed"));
 212                 pw_error(tempname, 0, 1);
 213         }
 214
 215         clnt_destroy(clnt);
 216
 217         if (ypval->stat != YP_TRUE) {
 218                 int stat = ypval->stat;
 219                 xdr_free(xdr_ypresp_val, (char *)ypval);
 220                 if (stat == YP_NOMAP && strstr(map, "master.passwd"))
 221                         return(1);
 222                 if (stat == YP_NOKEY)
 223                         return(1);
 224                 warnx("ypmatch failed: %s", yperr_string(ypprot_err(stat)));
 225                 pw_error(tempname, 0, 1);
 226         }
 227
 228
 229         strncpy((char *)&buf, ypval->val.valdat_val, ypval->val.valdat_len);
 230
 231         *result = (char *)&buf;
 232         *resultlen = ypval->val.valdat_len;
 233
 234         xdr_free(xdr_ypresp_val, (char *)ypval);
 235
 236         return(0);
 237 }
 238
 239 /*
 240  * Check if the user we're working with is local or in NIS.
 241  */
 242 int use_yp (user, uid, which)
 243         char *user;
 244         uid_t uid;
 245         int which; /* 0 = use username, 1 = use uid */
 246 {
 247         int user_local = 0, user_yp = 0, user_exists = 0;
 248         DB *dbp;
 249         DBT key,data;
 250         char bf[UT_NAMESIZE + 2];
 251         char *result;
 252         char *server;
 253         int resultlen;
 254         char ubuf[UT_NAMESIZE + 2];
 255
 256         if (which) {
 257                 snprintf(ubuf, sizeof(ubuf), "%lu", uid);
 258                 user = (char *)&ubuf;
 259         }
 260
 261         /* Grope around for the user in the usual way */
 262         if (which) {
 263                 if (getpwuid(uid) != NULL)
 264                         user_exists = 1;
 265         } else {
 266                 if (getpwnam(user) != NULL)
 267                         user_exists = 1;
 268         }
 269
 270         /* Now grope directly through the user database */
 271         if ((dbp = dbopen(_PATH_SMP_DB, O_RDONLY, PERM_SECURE,
 272                         DB_HASH, &openinfo)) == NULL) {
 273                         warn("error opening database: %s.", _PATH_MP_DB);
 274                         pw_error(tempname, 0, 1);
 275         }
 276
 277         /* Is NIS turned on */
 278         bf[0] = _PW_KEYYPENABLED;
 279         key.data = (u_char *)bf;
 280         key.size = 1;
 281         yp_in_pw_file = !(dbp->get)(dbp,&key,&data,0);
 282         if (_yp_check(NULL) || (yp_domain && yp_server)) {
 283                 server = get_yp_master(0);
 284
 285                 /* Is the user in the NIS passwd map */
 286                 if (!my_yp_match(server, yp_domain, which ? "passwd.byuid" :
 287                                         "passwd.byname", user, strlen(user),
 288                     &result, &resultlen)) {
 289                         user_yp = user_exists = 1;
 290                         *(char *)(result + resultlen) = '\0';
 291                         copy_yp_pass(result, 0, resultlen);
 292                 }
 293                 /* Is the user in the NIS master.passwd map */
 294                 if (user_yp && !my_yp_match(server, yp_domain, which ?
 295                         "master.passwd.byuid" : "master.passwd.byname",
 296                     user, strlen(user),
 297                     &result, &resultlen)) {
 298                         *(char *)(result + resultlen) = '\0';
 299                         copy_yp_pass(result, 1, resultlen);
 300                 }
 301         }
 302
 303         /* Is the user in the local password database */
 304
 305         bf[0] = which ? _PW_KEYBYUID : _PW_KEYBYNAME;
 306         if (which)
 307                 bcopy((char *)&uid, bf + 1, sizeof(uid));
 308         else
 309                 bcopy((char *)user, bf + 1, MIN(strlen(user), UT_NAMESIZE));
 310         key.data = (u_char *)bf;
 311         key.size = which ? sizeof(uid) + 1 : strlen(user) + 1;
 312         if (!(dbp->get)(dbp,&key,&data,0)) {
 313                 user_local = 1;
 314                 copy_local_pass(data.data, data.size);
 315         }
 316
 317         (dbp->close)(dbp);
 318
 319         if (user_local && user_yp && user_exists)
 320                 return(USER_YP_AND_LOCAL);
 321         else if (!user_local && user_yp && user_exists)
 322                 return(USER_YP_ONLY);
 323         else if (user_local && !user_yp && user_exists)
 324                 return(USER_LOCAL_ONLY);
 325         else if (!user_exists)
 326                 return(USER_UNKNOWN);
 327
 328         return(-1);
 329 }
 330
 331 /*
 332  * Find the name of the NIS master server for this domain
 333  * and make sure it's running yppasswdd.
 334  */
 335 char *get_yp_master(getserver)
 336         int getserver;
 337 {
 338         char *mastername;
 339         int rval, localport;
 340         struct stat st;
 341         char                    *sockname = YP_SOCKNAME;
 342
 343         /*
 344          * Sometimes we are called just to probe for rpc.yppasswdd and
 345          * set the suser_override flag. Just return NULL and leave
 346          * suser_override at 0 if _use_yp doesn't indicate that NIS is
 347          * in use and we weren't called from use_yp() itself.
 348          * Without this check, we might try probing and fail with an NIS
 349          * error in non-NIS environments.
 350          */
 351         if ((_use_yp == USER_UNKNOWN || _use_yp == USER_LOCAL_ONLY) &&
 352                                                                 getserver)
 353                 return(NULL);
 354
 355         /* Get default NIS domain. */
 356
 357         if (yp_domain == NULL && (rval = yp_get_default_domain(&yp_domain))) {
 358                 warnx("can't get local NIS domain name: %s",yperr_string(rval));
 359                 pw_error(tempname, 0, 1);
 360         }
 361
 362         /* Get master server of passwd map. */
 363
 364         if ((mastername = ypxfr_get_master(yp_domain, "passwd.byname",
 365                                 yp_server, yp_server ? 0 : 1)) == NULL) {
 366                 warnx("can't get name of master NIS server");
 367                 pw_error(tempname, 0, 1);
 368         }
 369
 370         if (!getserver)
 371                 return(mastername);
 372
 373         /* Check if yppasswdd is out there. */
 374
 375         if ((rval = getrpcport(mastername, YPPASSWDPROG, YPPASSWDPROC_UPDATE,
 376                 IPPROTO_UDP)) == 0) {
 377                 warnx("rpc.yppasswdd is not running on the NIS master server");
 378                 pw_error(tempname, 0, 1);
 379         }
 380
 381         /*
 382          * Make sure it's on a reserved port.
 383          * XXX Might break with yppasswdd servers running on Solaris 2.x.
 384          */
 385
 386         if (rval >= IPPORT_RESERVED) {
 387                 warnx("rpc.yppasswdd server not running on reserved port");
 388                 pw_error(tempname, 0, 1);
 389         }
 390
 391         /* See if _we_ are the master server. */
 392         if (!force_old && !getuid() && (localport = getrpcport("localhost",
 393                 YPPASSWDPROG, YPPASSWDPROC_UPDATE, IPPROTO_UDP)) != 0) {
 394                 if (localport == rval && stat(sockname, &st) != -1) {
 395                         suser_override = 1;
 396                         mastername = "localhost";
 397                 }
 398         }
 399
 400         /* Everything checks out: return the name of the server. */
 401
 402         return (mastername);
 403 }
 404
 405 /*
 406  * Ask the user for his NIS password and submit the new information
 407  * to yppasswdd. Note that rpc.yppasswdd requires password authentication
 408  * and only allows changes to existing records rather than the addition
 409  * of new records. (To do actual updates we would need something like
 410  * secure RPC and ypupdated, which FreeBSD doesn't have yet.) The FreeBSD
 411  * rpc.yppasswdd has some special hooks to allow the superuser update
 412  * information without specifying a password, however this only works
 413  * for the superuser on the NIS master server.
 414  */
 415 void yp_submit(pw)
 416         struct passwd *pw;
 417 {
 418         struct yppasswd yppasswd;
 419         struct master_yppasswd master_yppasswd;
 420         CLIENT *clnt;
 421         char *master, *password;
 422         int *status = NULL;
 423         struct rpc_err err;
 424         char                    *sockname = YP_SOCKNAME;
 425
 426         _use_yp = 1;
 427
 428         /* Get NIS master server name */
 429
 430         master = get_yp_master(1);
 431
 432         /* Populate the yppasswd structure that gets handed to yppasswdd. */
 433
 434         if (suser_override) {
 435                 master_yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
 436                 master_yppasswd.newpw.pw_name = strdup(pw->pw_name);
 437                 master_yppasswd.newpw.pw_uid = pw->pw_uid;
 438                 master_yppasswd.newpw.pw_gid = pw->pw_gid;
 439                 master_yppasswd.newpw.pw_expire = pw->pw_expire;
 440                 master_yppasswd.newpw.pw_change = pw->pw_change;
 441                 master_yppasswd.newpw.pw_fields = pw->pw_fields;
 442                 master_yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
 443                 master_yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
 444                 master_yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
 445                 master_yppasswd.newpw.pw_class = pw->pw_class != NULL ?
 446                                                 strdup(pw->pw_class) : "";
 447                 master_yppasswd.oldpass = ""; /* not really needed */
 448                 master_yppasswd.domain = yp_domain;
 449         } else {
 450                 yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
 451                 yppasswd.newpw.pw_name = strdup(pw->pw_name);
 452                 yppasswd.newpw.pw_uid = pw->pw_uid;
 453                 yppasswd.newpw.pw_gid = pw->pw_gid;
 454                 yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
 455                 yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
 456                 yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
 457                 yppasswd.oldpass = "";
 458         }
 459
 460         /* Get the user's password for authentication purposes. */
 461
 462         printf ("Changing NIS information for %s on %s\n",
 463                                         pw->pw_name, master);
 464
 465         if (pw->pw_passwd[0] && !suser_override) {
 466                 password = getpass("Please enter password: ");
 467                 if (strncmp(crypt(password,pw->pw_passwd),
 468                                 pw->pw_passwd,strlen(pw->pw_passwd))) {
 469                         warnx("Password incorrect.");
 470                         pw_error(tempname, 0, 1);
 471                 }
 472                 yppasswd.oldpass = password;    /* XXX */
 473         }
 474
 475         if (suser_override) {
 476                 /* Talk to server via AF_UNIX socket. */
 477                 clnt = clnt_create(sockname, MASTER_YPPASSWDPROG,
 478                                         MASTER_YPPASSWDVERS, "unix");
 479                 if (clnt == NULL) {
 480                         warnx("failed to contact rpc.yppasswdd: %s",
 481                                 clnt_spcreateerror(master));
 482                         pw_error(tempname, 0, 1);
 483                 }
 484         } else {
 485                 /* Create a handle to yppasswdd. */
 486
 487                 if ((clnt = clnt_create(master, YPPASSWDPROG,
 488                                         YPPASSWDVERS, "udp")) == NULL) {
 489                         warnx("failed to contact rpc.yppasswdd: %s",
 490                                 clnt_spcreateerror(master));
 491                         pw_error(tempname, 0, 1);
 492                 }
 493         }
 494
 495         clnt->cl_auth = authunix_create_default();
 496
 497         if (suser_override)
 498                 status = yppasswdproc_update_master_1(&master_yppasswd, clnt);
 499         else
 500                 status = yppasswdproc_update_1(&yppasswd, clnt);
 501
 502         clnt_geterr(clnt, &err);
 503
 504         auth_destroy(clnt->cl_auth);
 505         clnt_destroy(clnt);
 506
 507         /* Call failed: signal the error. */
 508
 509         if (err.re_status != RPC_SUCCESS || status == NULL || *status) {
 510                 warnx("NIS update failed: %s", clnt_sperrno(err.re_status));
 511                 pw_error(NULL, 0, 1);
 512         }
 513
 514         /* Success. */
 515
 516         if (suser_override)
 517                 warnx("NIS information changed on host %s, domain %s",
 518                         master, yp_domain);
 519         else
 520                 warnx("NIS information changed on host %s", master);
 521
 522         return;
 523 }
 524 #endif /* YP */