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  *      $FreeBSD$
  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_comm.h"
  69 #include "yppasswd_private.h"
  70
  71 #define PERM_SECURE (S_IRUSR|S_IWUSR)
  72 static HASHINFO openinfo = {
  73         4096,           /* bsize */
  74         32,             /* ffactor */
  75         256,            /* nelem */
  76         2048 * 1024,    /* cachesize */
  77         NULL,           /* hash */
  78         0,              /* lorder */
  79 };
  80
  81 int force_old = 0;
  82 int _use_yp = 0;
  83 int suser_override = 0;
  84 int yp_in_pw_file = 0;
  85 char *yp_domain = NULL;
  86 char *yp_server = NULL;
  87
  88 extern char *tempname;
  89
  90 /* Save the local and NIS password information */
  91 struct passwd local_password;
  92 struct passwd yp_password;
  93
  94 void copy_yp_pass(p, x, m)
  95 char *p;
  96 int x, m;
  97 {
  98         register char *t, *s = p;
  99         static char *buf;
 100
 101         yp_password.pw_fields = 0;
 102
 103         buf = (char *)realloc(buf, m + 10);
 104         bzero(buf, m + 10);
 105
 106         /* Turn all colons into NULLs */
 107         while (strchr(s, ':')) {
 108                 s = (strchr(s, ':') + 1);
 109                 *(s - 1)= '\0';
 110         }
 111
 112         t = buf;
 113 #define EXPAND(e)       e = t; while ((*t++ = *p++));
 114         EXPAND(yp_password.pw_name);
 115         yp_password.pw_fields |= _PWF_NAME;
 116         EXPAND(yp_password.pw_passwd);
 117         yp_password.pw_fields |= _PWF_PASSWD;
 118         yp_password.pw_uid = atoi(p);
 119         p += (strlen(p) + 1);
 120         yp_password.pw_fields |= _PWF_UID;
 121         yp_password.pw_gid = atoi(p);
 122         p += (strlen(p) + 1);
 123         yp_password.pw_fields |= _PWF_GID;
 124         if (x) {
 125                 EXPAND(yp_password.pw_class);
 126                 yp_password.pw_fields |= _PWF_CLASS;
 127                 yp_password.pw_change = atol(p);
 128                 p += (strlen(p) + 1);
 129                 yp_password.pw_fields |= _PWF_CHANGE;
 130                 yp_password.pw_expire = atol(p);
 131                 p += (strlen(p) + 1);
 132                 yp_password.pw_fields |= _PWF_EXPIRE;
 133         }
 134         EXPAND(yp_password.pw_gecos);
 135         yp_password.pw_fields |= _PWF_GECOS;
 136         EXPAND(yp_password.pw_dir);
 137         yp_password.pw_fields |= _PWF_DIR;
 138         EXPAND(yp_password.pw_shell);
 139         yp_password.pw_fields |= _PWF_SHELL;
 140
 141         return;
 142 }
 143
 144 void copy_local_pass(p,m)
 145 char *p;
 146 int m;
 147 {
 148         register char *t;
 149         static char *buf;
 150
 151         buf = (char *)realloc(buf, m + 10);
 152         bzero(buf, m + 10);
 153
 154         t = buf;
 155         EXPAND(local_password.pw_name);
 156         EXPAND(local_password.pw_passwd);
 157         bcopy(p, (char *)&local_password.pw_uid, sizeof(int));
 158         p += sizeof(int);
 159         bcopy(p, (char *)&local_password.pw_gid, sizeof(int));
 160         p += sizeof(int);
 161         bcopy(p, (char *)&local_password.pw_change, sizeof(time_t));
 162         p += sizeof(time_t);
 163         EXPAND(local_password.pw_class);
 164         EXPAND(local_password.pw_gecos);
 165         EXPAND(local_password.pw_dir);
 166         EXPAND(local_password.pw_shell);
 167         bcopy(p, (char *)&local_password.pw_expire, sizeof(time_t));
 168         p += sizeof(time_t);
 169         bcopy(p, (char *)&local_password.pw_fields, sizeof local_password.pw_fields);
 170         p += sizeof local_password.pw_fields;
 171
 172         return;
 173 }
 174
 175 /*
 176  * It is not mandatory that an NIS master server also be a client.
 177  * However, if the NIS master is not configured as a client, then the
 178  * domain name will not be set and ypbind will not be running, so we
 179  * will be unable to use the ypclnt routines inside libc. We therefore
 180  * need our own magic version of yp_match() which we can use in any
 181  * environment.
 182  */
 183 static int my_yp_match(server, domain, map, key, keylen, result, resultlen)
 184         char *server;
 185         char *domain;
 186         char *map;
 187         char *key;
 188         unsigned long keylen;
 189         char **result;
 190         unsigned long *resultlen;
 191 {
 192         ypreq_key ypkey;
 193         ypresp_val *ypval;
 194         CLIENT *clnt;
 195         static char buf[YPMAXRECORD + 2];
 196
 197         bzero((char *)buf, sizeof(buf));
 198
 199         if ((clnt = clnt_create(server, YPPROG,YPVERS,"udp")) == NULL) {
 200                 warnx("failed to create UDP handle: %s",
 201                                         clnt_spcreateerror(server));
 202                 pw_error(tempname, 0, 1);
 203         }
 204
 205         ypkey.domain = domain;
 206         ypkey.map = map;
 207         ypkey.key.keydat_len = keylen;
 208         ypkey.key.keydat_val = key;
 209
 210         if ((ypval = ypproc_match_2(&ypkey, clnt)) == NULL) {
 211                 clnt_destroy(clnt);
 212                 warnx("%s",clnt_sperror(clnt,"YPPROC_MATCH failed"));
 213                 pw_error(tempname, 0, 1);
 214         }
 215
 216         clnt_destroy(clnt);
 217
 218         if (ypval->stat != YP_TRUE) {
 219                 int stat = ypval->stat;
 220                 xdr_free(xdr_ypresp_val, (char *)ypval);
 221                 if (stat == YP_NOMAP && strstr(map, "master.passwd"))
 222                         return(1);
 223                 if (stat == YP_NOKEY)
 224                         return(1);
 225                 warnx("ypmatch failed: %s", yperr_string(ypprot_err(stat)));
 226                 pw_error(tempname, 0, 1);
 227         }
 228
 229
 230         strncpy((char *)&buf, ypval->val.valdat_val, ypval->val.valdat_len);
 231
 232         *result = (char *)&buf;
 233         *resultlen = ypval->val.valdat_len;
 234
 235         xdr_free(xdr_ypresp_val, (char *)ypval);
 236
 237         return(0);
 238 }
 239
 240 /*
 241  * Check if the user we're working with is local or in NIS.
 242  */
 243 int use_yp (user, uid, which)
 244         char *user;
 245         uid_t uid;
 246         int which; /* 0 = use username, 1 = use uid */
 247 {
 248         int user_local = 0, user_yp = 0, user_exists = 0;
 249         DB *dbp;
 250         DBT key,data;
 251         char bf[UT_NAMESIZE + 2];
 252         char *result;
 253         char *server;
 254         int resultlen;
 255         char ubuf[UT_NAMESIZE + 2];
 256
 257         if (which) {
 258                 snprintf(ubuf, sizeof(ubuf), "%lu", uid);
 259                 user = (char *)&ubuf;
 260         }
 261
 262         /* Grope around for the user in the usual way */
 263         if (which) {
 264                 if (getpwuid(uid) != NULL)
 265                         user_exists = 1;
 266         } else {
 267                 if (getpwnam(user) != NULL)
 268                         user_exists = 1;
 269         }
 270
 271         /* Now grope directly through the user database */
 272         if ((dbp = dbopen(_PATH_SMP_DB, O_RDONLY, PERM_SECURE,
 273                         DB_HASH, &openinfo)) == NULL) {
 274                         warn("error opening database: %s.", _PATH_MP_DB);
 275                         pw_error(tempname, 0, 1);
 276         }
 277
 278         /* Is NIS turned on */
 279         bf[0] = _PW_KEYYPENABLED;
 280         key.data = (u_char *)bf;
 281         key.size = 1;
 282         yp_in_pw_file = !(dbp->get)(dbp,&key,&data,0);
 283         if (_yp_check(NULL) || (yp_domain && yp_server)) {
 284                 server = get_yp_master(0);
 285
 286                 /* Is the user in the NIS passwd map */
 287                 if (!my_yp_match(server, yp_domain, which ? "passwd.byuid" :
 288                                         "passwd.byname", user, strlen(user),
 289                     &result, &resultlen)) {
 290                         user_yp = user_exists = 1;
 291                         *(char *)(result + resultlen) = '\0';
 292                         copy_yp_pass(result, 0, resultlen);
 293                 }
 294                 /* Is the user in the NIS master.passwd map */
 295                 if (user_yp && !my_yp_match(server, yp_domain, which ?
 296                         "master.passwd.byuid" : "master.passwd.byname",
 297                     user, strlen(user),
 298                     &result, &resultlen)) {
 299                         *(char *)(result + resultlen) = '\0';
 300                         copy_yp_pass(result, 1, resultlen);
 301                 }
 302         }
 303
 304         /* Is the user in the local password database */
 305
 306         bf[0] = which ? _PW_KEYBYUID : _PW_KEYBYNAME;
 307         if (which)
 308                 bcopy((char *)&uid, bf + 1, sizeof(uid));
 309         else
 310                 bcopy((char *)user, bf + 1, MIN(strlen(user), UT_NAMESIZE));
 311         key.data = (u_char *)bf;
 312         key.size = which ? sizeof(uid) + 1 : strlen(user) + 1;
 313         if (!(dbp->get)(dbp,&key,&data,0)) {
 314                 user_local = 1;
 315                 copy_local_pass(data.data, data.size);
 316         }
 317
 318         (dbp->close)(dbp);
 319
 320         if (user_local && user_yp && user_exists)
 321                 return(USER_YP_AND_LOCAL);
 322         else if (!user_local && user_yp && user_exists)
 323                 return(USER_YP_ONLY);
 324         else if (user_local && !user_yp && user_exists)
 325                 return(USER_LOCAL_ONLY);
 326         else if (!user_exists)
 327                 return(USER_UNKNOWN);
 328
 329         return(-1);
 330 }
 331
 332 /*
 333  * Find the name of the NIS master server for this domain
 334  * and make sure it's running yppasswdd.
 335  */
 336 char *get_yp_master(getserver)
 337         int getserver;
 338 {
 339         char *mastername;
 340         int rval, localport;
 341         struct stat st;
 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
 425         _use_yp = 1;
 426
 427         /* Get NIS master server name */
 428
 429         master = get_yp_master(1);
 430
 431         /* Populate the yppasswd structure that gets handed to yppasswdd. */
 432
 433         if (suser_override) {
 434                 master_yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
 435                 master_yppasswd.newpw.pw_name = strdup(pw->pw_name);
 436                 master_yppasswd.newpw.pw_uid = pw->pw_uid;
 437                 master_yppasswd.newpw.pw_gid = pw->pw_gid;
 438                 master_yppasswd.newpw.pw_expire = pw->pw_expire;
 439                 master_yppasswd.newpw.pw_change = pw->pw_change;
 440                 master_yppasswd.newpw.pw_fields = pw->pw_fields;
 441                 master_yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
 442                 master_yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
 443                 master_yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
 444                 master_yppasswd.newpw.pw_class = strdup(pw->pw_class);
 445                 master_yppasswd.oldpass = ""; /* not really needed */
 446                 master_yppasswd.domain = yp_domain;
 447         } else {
 448                 yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
 449                 yppasswd.newpw.pw_name = strdup(pw->pw_name);
 450                 yppasswd.newpw.pw_uid = pw->pw_uid;
 451                 yppasswd.newpw.pw_gid = pw->pw_gid;
 452                 yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
 453                 yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
 454                 yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
 455                 yppasswd.oldpass = "";
 456         }
 457
 458         /* Get the user's password for authentication purposes. */
 459
 460         printf ("Changing NIS information for %s on %s\n",
 461                                         pw->pw_name, master);
 462
 463         if (pw->pw_passwd[0] && !suser_override) {
 464                 password = getpass("Please enter password: ");
 465                 if (strncmp(crypt(password,pw->pw_passwd),
 466                                 pw->pw_passwd,strlen(pw->pw_passwd))) {
 467                         warnx("Password incorrect.");
 468                         pw_error(tempname, 0, 1);
 469                 }
 470                 yppasswd.oldpass = password;    /* XXX */
 471         }
 472
 473         if (suser_override) {
 474                 /* Talk to server via AF_UNIX socket. */
 475                 if (senddat(&master_yppasswd)) {
 476                         warnx("failed to contact local rpc.yppasswdd");
 477                         pw_error(tempname, 0, 1);
 478                 }
 479                 /* Get return code. */
 480                 status = getresp();
 481         } else {
 482                 /* Create a handle to yppasswdd. */
 483
 484                 if ((clnt = clnt_create(master, YPPASSWDPROG,
 485                                         YPPASSWDVERS, "udp")) == NULL) {
 486                         warnx("failed to contact rpc.yppasswdd: %s",
 487                                 master, clnt_spcreateerror(master));
 488                         pw_error(tempname, 0, 1);
 489                 }
 490
 491                 clnt->cl_auth = authunix_create_default();
 492
 493                 status = yppasswdproc_update_1(&yppasswd, clnt);
 494
 495                 clnt_geterr(clnt, &err);
 496
 497                 auth_destroy(clnt->cl_auth);
 498                 clnt_destroy(clnt);
 499         }
 500
 501         /* Call failed: signal the error. */
 502
 503         if ((!suser_override && err.re_status) != RPC_SUCCESS || status == NULL || *status) {
 504                 warnx("NIS update failed: %s", (err.re_status != RPC_SUCCESS &&
 505                         !suser_override) ? clnt_sperrno(err.re_status) :
 506                                         "rpc.yppasswdd returned error status");
 507                 pw_error(NULL, 0, 1);
 508         }
 509
 510         /* Success. */
 511
 512         if (suser_override)
 513                 warnx("NIS information changed on host %s, domain %s",
 514                         master, yp_domain);
 515         else
 516                 warnx("NIS information changed on host %s", master);
 517
 518         return;
 519 }
 520 #endif /* YP */