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_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         /*
 199          * Don't make this a fatal error. The inability to contact
 200          * a server is, for our purposes, equivalent to not finding
 201          * the record we were looking for. Letting use_yp() know
 202          * that the lookup failed is sufficient.
 203          */
 204         if ((clnt = clnt_create(server, YPPROG,YPVERS,"udp")) == NULL) {
 205                 return(1);
 206 #ifdef notdef
 207                 warnx("failed to create UDP handle: %s",
 208                                         clnt_spcreateerror(server));
 209                 pw_error(tempname, 0, 1);
 210 #endif
 211         }
 212
 213         ypkey.domain = domain;
 214         ypkey.map = map;
 215         ypkey.key.keydat_len = keylen;
 216         ypkey.key.keydat_val = key;
 217
 218         if ((ypval = ypproc_match_2(&ypkey, clnt)) == NULL) {
 219                 clnt_destroy(clnt);
 220                 return(1);
 221 #ifdef notdef
 222                 warnx("%s",clnt_sperror(clnt,"YPPROC_MATCH failed"));
 223                 pw_error(tempname, 0, 1);
 224 #endif
 225         }
 226
 227         clnt_destroy(clnt);
 228
 229         if (ypval->stat != YP_TRUE) {
 230                 xdr_free(xdr_ypresp_val, (char *)ypval);
 231                 return(1);
 232 #ifdef notdef
 233                 int stat = ypval->stat;
 234                 xdr_free(xdr_ypresp_val, (char *)ypval);
 235                 if (stat == YP_NOMAP && strstr(map, "master.passwd"))
 236                         return(1);
 237                 if (stat == YP_NOKEY)
 238                         return(1);
 239                 warnx("ypmatch failed: %s", yperr_string(ypprot_err(stat)));
 240                 pw_error(tempname, 0, 1);
 241 #endif
 242         }
 243
 244
 245         strncpy((char *)&buf, ypval->val.valdat_val, ypval->val.valdat_len);
 246
 247         *result = (char *)&buf;
 248         *resultlen = ypval->val.valdat_len;
 249
 250         xdr_free(xdr_ypresp_val, (char *)ypval);
 251
 252         return(0);
 253 }
 254
 255 /*
 256  * Check if the user we're working with is local or in NIS.
 257  */
 258 int use_yp (user, uid, which)
 259         char *user;
 260         uid_t uid;
 261         int which; /* 0 = use username, 1 = use uid */
 262 {
 263         int user_local = 0, user_yp = 0, user_exists = 0;
 264         DB *dbp;
 265         DBT key,data;
 266         char bf[UT_NAMESIZE + 2];
 267         char *result;
 268         char *server;
 269         int resultlen;
 270         char ubuf[UT_NAMESIZE + 2];
 271
 272         if (which) {
 273                 snprintf(ubuf, sizeof(ubuf), "%lu", (unsigned long)uid);
 274                 user = (char *)&ubuf;
 275         }
 276
 277         /* Grope around for the user in the usual way */
 278         if (which) {
 279                 if (getpwuid(uid) != NULL)
 280                         user_exists = 1;
 281         } else {
 282                 if (getpwnam(user) != NULL)
 283                         user_exists = 1;
 284         }
 285
 286         /* Now grope directly through the user database */
 287         if ((dbp = dbopen(_PATH_SMP_DB, O_RDONLY, PERM_SECURE,
 288                         DB_HASH, &openinfo)) == NULL) {
 289                         warn("error opening database: %s.", _PATH_MP_DB);
 290                         pw_error(tempname, 0, 1);
 291         }
 292
 293         /* Is NIS turned on */
 294         bf[0] = _PW_KEYYPENABLED;
 295         key.data = (u_char *)bf;
 296         key.size = 1;
 297         yp_in_pw_file = !(dbp->get)(dbp,&key,&data,0);
 298         if (_yp_check(NULL) || (yp_domain && yp_server)) {
 299                 server = get_yp_master(0);
 300
 301                 /* Is the user in the NIS passwd map */
 302                 if (!my_yp_match(server, yp_domain, which ? "passwd.byuid" :
 303                                         "passwd.byname", user, strlen(user),
 304                     &result, &resultlen)) {
 305                         user_yp = user_exists = 1;
 306                         *(char *)(result + resultlen) = '\0';
 307                         copy_yp_pass(result, 0, resultlen);
 308                 }
 309                 /* Is the user in the NIS master.passwd map */
 310                 if (user_yp && !my_yp_match(server, yp_domain, which ?
 311                         "master.passwd.byuid" : "master.passwd.byname",
 312                     user, strlen(user),
 313                     &result, &resultlen)) {
 314                         *(char *)(result + resultlen) = '\0';
 315                         copy_yp_pass(result, 1, resultlen);
 316                 }
 317         }
 318
 319         /* Is the user in the local password database */
 320
 321         bf[0] = which ? _PW_KEYBYUID : _PW_KEYBYNAME;
 322         if (which)
 323                 bcopy((char *)&uid, bf + 1, sizeof(uid));
 324         else
 325                 bcopy((char *)user, bf + 1, MIN(strlen(user), UT_NAMESIZE));
 326         key.data = (u_char *)bf;
 327         key.size = which ? sizeof(uid) + 1 : strlen(user) + 1;
 328         if (!(dbp->get)(dbp,&key,&data,0)) {
 329                 user_local = 1;
 330                 copy_local_pass(data.data, data.size);
 331         }
 332
 333         (dbp->close)(dbp);
 334
 335         if (user_local && user_yp && user_exists)
 336                 return(USER_YP_AND_LOCAL);
 337         else if (!user_local && user_yp && user_exists)
 338                 return(USER_YP_ONLY);
 339         else if (user_local && !user_yp && user_exists)
 340                 return(USER_LOCAL_ONLY);
 341         else if (!user_exists)
 342                 return(USER_UNKNOWN);
 343
 344         return(-1);
 345 }
 346
 347 /*
 348  * Find the name of the NIS master server for this domain
 349  * and make sure it's running yppasswdd.
 350  */
 351 char *get_yp_master(getserver)
 352         int getserver;
 353 {
 354         char *mastername;
 355         int rval, localport;
 356         struct stat st;
 357         char                    *sockname = YP_SOCKNAME;
 358
 359         /*
 360          * Sometimes we are called just to probe for rpc.yppasswdd and
 361          * set the suser_override flag. Just return NULL and leave
 362          * suser_override at 0 if _use_yp doesn't indicate that NIS is
 363          * in use and we weren't called from use_yp() itself.
 364          * Without this check, we might try probing and fail with an NIS
 365          * error in non-NIS environments.
 366          */
 367         if ((_use_yp == USER_UNKNOWN || _use_yp == USER_LOCAL_ONLY) &&
 368                                                                 getserver)
 369                 return(NULL);
 370
 371         /* Get default NIS domain. */
 372
 373         if (yp_domain == NULL && (rval = yp_get_default_domain(&yp_domain))) {
 374                 warnx("can't get local NIS domain name: %s",yperr_string(rval));
 375                 pw_error(tempname, 0, 1);
 376         }
 377
 378         /* Get master server of passwd map. */
 379
 380         if ((mastername = ypxfr_get_master(yp_domain, "passwd.byname",
 381                                 yp_server, yp_server ? 0 : 1)) == NULL) {
 382                 warnx("can't get name of master NIS server");
 383                 pw_error(tempname, 0, 1);
 384         }
 385
 386         if (!getserver)
 387                 return(mastername);
 388
 389         /* Check if yppasswdd is out there. */
 390
 391         if ((rval = getrpcport(mastername, YPPASSWDPROG, YPPASSWDPROC_UPDATE,
 392                 IPPROTO_UDP)) == 0) {
 393                 warnx("rpc.yppasswdd is not running on the NIS master server");
 394                 pw_error(tempname, 0, 1);
 395         }
 396
 397         /*
 398          * Make sure it's on a reserved port.
 399          * XXX Might break with yppasswdd servers running on Solaris 2.x.
 400          */
 401
 402         if (rval >= IPPORT_RESERVED) {
 403                 warnx("rpc.yppasswdd server not running on reserved port");
 404                 pw_error(tempname, 0, 1);
 405         }
 406
 407         /* See if _we_ are the master server. */
 408         if (!force_old && !getuid() && (localport = getrpcport("localhost",
 409                 YPPASSWDPROG, YPPASSWDPROC_UPDATE, IPPROTO_UDP)) != 0) {
 410                 if (localport == rval && stat(sockname, &st) != -1) {
 411                         suser_override = 1;
 412                         mastername = "localhost";
 413                 }
 414         }
 415
 416         /* Everything checks out: return the name of the server. */
 417
 418         return (mastername);
 419 }
 420
 421 /*
 422  * Ask the user for his NIS password and submit the new information
 423  * to yppasswdd. Note that rpc.yppasswdd requires password authentication
 424  * and only allows changes to existing records rather than the addition
 425  * of new records. (To do actual updates we would need something like
 426  * secure RPC and ypupdated, which FreeBSD doesn't have yet.) The FreeBSD
 427  * rpc.yppasswdd has some special hooks to allow the superuser update
 428  * information without specifying a password, however this only works
 429  * for the superuser on the NIS master server.
 430  */
 431 void yp_submit(pw)
 432         struct passwd *pw;
 433 {
 434         struct yppasswd yppasswd;
 435         struct master_yppasswd master_yppasswd;
 436         CLIENT *clnt;
 437         char *master, *password;
 438         int *status = NULL;
 439         struct rpc_err err;
 440         char                    *sockname = YP_SOCKNAME;
 441
 442         _use_yp = 1;
 443
 444         /* Get NIS master server name */
 445
 446         master = get_yp_master(1);
 447
 448         /* Populate the yppasswd structure that gets handed to yppasswdd. */
 449
 450         if (suser_override) {
 451                 master_yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
 452                 master_yppasswd.newpw.pw_name = strdup(pw->pw_name);
 453                 master_yppasswd.newpw.pw_uid = pw->pw_uid;
 454                 master_yppasswd.newpw.pw_gid = pw->pw_gid;
 455                 master_yppasswd.newpw.pw_expire = pw->pw_expire;
 456                 master_yppasswd.newpw.pw_change = pw->pw_change;
 457                 master_yppasswd.newpw.pw_fields = pw->pw_fields;
 458                 master_yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
 459                 master_yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
 460                 master_yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
 461                 master_yppasswd.newpw.pw_class = pw->pw_class != NULL ?
 462                                                 strdup(pw->pw_class) : "";
 463                 master_yppasswd.oldpass = ""; /* not really needed */
 464                 master_yppasswd.domain = yp_domain;
 465         } else {
 466                 yppasswd.newpw.pw_passwd = strdup(pw->pw_passwd);
 467                 yppasswd.newpw.pw_name = strdup(pw->pw_name);
 468                 yppasswd.newpw.pw_uid = pw->pw_uid;
 469                 yppasswd.newpw.pw_gid = pw->pw_gid;
 470                 yppasswd.newpw.pw_gecos = strdup(pw->pw_gecos);
 471                 yppasswd.newpw.pw_dir = strdup(pw->pw_dir);
 472                 yppasswd.newpw.pw_shell = strdup(pw->pw_shell);
 473                 yppasswd.oldpass = "";
 474         }
 475
 476         /* Get the user's password for authentication purposes. */
 477
 478         printf ("Changing NIS information for %s on %s\n",
 479                                         pw->pw_name, master);
 480
 481         if (pw->pw_passwd[0] && !suser_override) {
 482                 password = getpass("Please enter password: ");
 483                 if (strncmp(crypt(password,pw->pw_passwd),
 484                                 pw->pw_passwd,strlen(pw->pw_passwd))) {
 485                         warnx("Password incorrect.");
 486                         pw_error(tempname, 0, 1);
 487                 }
 488                 yppasswd.oldpass = password;    /* XXX */
 489         }
 490
 491         if (suser_override) {
 492                 /* Talk to server via AF_UNIX socket. */
 493                 clnt = clnt_create(sockname, MASTER_YPPASSWDPROG,
 494                                         MASTER_YPPASSWDVERS, "unix");
 495                 if (clnt == NULL) {
 496                         warnx("failed to contact rpc.yppasswdd: %s",
 497                                 clnt_spcreateerror(master));
 498                         pw_error(tempname, 0, 1);
 499                 }
 500         } else {
 501                 /* Create a handle to yppasswdd. */
 502
 503                 if ((clnt = clnt_create(master, YPPASSWDPROG,
 504                                         YPPASSWDVERS, "udp")) == NULL) {
 505                         warnx("failed to contact rpc.yppasswdd: %s",
 506                                 clnt_spcreateerror(master));
 507                         pw_error(tempname, 0, 1);
 508                 }
 509         }
 510
 511         clnt->cl_auth = authunix_create_default();
 512
 513         if (suser_override)
 514                 status = yppasswdproc_update_master_1(&master_yppasswd, clnt);
 515         else
 516                 status = yppasswdproc_update_1(&yppasswd, clnt);
 517
 518         clnt_geterr(clnt, &err);
 519
 520         auth_destroy(clnt->cl_auth);
 521         clnt_destroy(clnt);
 522
 523         /* Call failed: signal the error. */
 524
 525         if (err.re_status != RPC_SUCCESS || status == NULL || *status) {
 526                 warnx("NIS update failed: %s", clnt_sperrno(err.re_status));
 527                 pw_error(NULL, 0, 1);
 528         }
 529
 530         /* Success. */
 531
 532         if (suser_override)
 533                 warnx("NIS information changed on host %s, domain %s",
 534                         master, yp_domain);
 535         else
 536                 warnx("NIS information changed on host %s", master);
 537
 538         return;
 539 }
 540 #endif /* YP */