usr.sbin/rpc.yppasswdd/yppasswdd_server.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-4-Clause
   3  *
   4  * Copyright (c) 1995, 1996
   5  *      Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Bill Paul.
  18  * 4. Neither the name of the author nor the names of any co-contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 __FBSDID("$FreeBSD$");
  37
  38 #include <sys/param.h>
  39 #include <sys/fcntl.h>
  40 #include <sys/socket.h>
  41 #include <sys/stat.h>
  42 #include <sys/wait.h>
  43
  44 #include <arpa/inet.h>
  45 #include <netinet/in.h>
  46
  47 #include <ctype.h>
  48 #include <db.h>
  49 #include <dirent.h>
  50 #include <errno.h>
  51 #include <limits.h>
  52 #include <pwd.h>
  53 #include <signal.h>
  54 #include <stdio.h>
  55 #include <stdlib.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 #include <libgen.h>
  60 #include <libutil.h>
  61
  62 #include <rpc/rpc.h>
  63 #include <rpcsvc/yp.h>
  64 struct dom_binding;
  65 #include <rpcsvc/ypclnt.h>
  66 #include "yppasswdd_extern.h"
  67 #include "yppasswd.h"
  68 #include "yppasswd_private.h"
  69 #include "ypxfr_extern.h"
  70 #include "yp_extern.h"
  71
  72 static struct passwd yp_password;
  73
  74 static void
  75 xlate_passwd(struct x_master_passwd *xpwd, struct passwd *pwd)
  76 {
  77         pwd->pw_name = xpwd->pw_name;
  78         pwd->pw_passwd = xpwd->pw_passwd;
  79         pwd->pw_uid = xpwd->pw_uid;
  80         pwd->pw_gid = xpwd->pw_gid;
  81         pwd->pw_change = xpwd->pw_change;
  82         pwd->pw_class = xpwd->pw_class;
  83         pwd->pw_gecos = xpwd->pw_gecos;
  84         pwd->pw_dir = xpwd->pw_dir;
  85         pwd->pw_shell = xpwd->pw_shell;
  86         pwd->pw_expire = xpwd->pw_expire;
  87         pwd->pw_fields = xpwd->pw_fields;
  88 }
  89
  90 static void
  91 copy_yp_pass(char *p, int x, int m)
  92 {
  93         char *t, *s = p;
  94         static char *buf;
  95
  96         yp_password.pw_fields = 0;
  97
  98         buf = realloc(buf, m + 10);
  99         bzero(buf, m + 10);
 100
 101         /* Turn all colons into NULLs */
 102         while (strchr(s, ':')) {
 103                 s = (strchr(s, ':') + 1);
 104                 *(s - 1)= '\0';
 105         }
 106
 107         t = buf;
 108 #define EXPAND(e) do { \
 109         e = t; \
 110         while ((*t++ = *p++)); \
 111 } while (0)
 112         EXPAND(yp_password.pw_name);
 113         yp_password.pw_fields |= _PWF_NAME;
 114         EXPAND(yp_password.pw_passwd);
 115         yp_password.pw_fields |= _PWF_PASSWD;
 116         yp_password.pw_uid = atoi(p);
 117         p += (strlen(p) + 1);
 118         yp_password.pw_fields |= _PWF_UID;
 119         yp_password.pw_gid = atoi(p);
 120         p += (strlen(p) + 1);
 121         yp_password.pw_fields |= _PWF_GID;
 122         if (x) {
 123                 EXPAND(yp_password.pw_class);
 124                 yp_password.pw_fields |= _PWF_CLASS;
 125                 yp_password.pw_change = atol(p);
 126                 p += (strlen(p) + 1);
 127                 yp_password.pw_fields |= _PWF_CHANGE;
 128                 yp_password.pw_expire = atol(p);
 129                 p += (strlen(p) + 1);
 130                 yp_password.pw_fields |= _PWF_EXPIRE;
 131         }
 132         EXPAND(yp_password.pw_gecos);
 133         yp_password.pw_fields |= _PWF_GECOS;
 134         EXPAND(yp_password.pw_dir);
 135         yp_password.pw_fields |= _PWF_DIR;
 136         EXPAND(yp_password.pw_shell);
 137         yp_password.pw_fields |= _PWF_SHELL;
 138
 139         return;
 140 }
 141
 142 static int
 143 validchars(char *arg)
 144 {
 145         size_t i;
 146
 147         for (i = 0; i < strlen(arg); i++) {
 148                 if (iscntrl(arg[i])) {
 149                         yp_error("string contains a control character");
 150                         return(1);
 151                 }
 152                 if (arg[i] == ':') {
 153                         yp_error("string contains a colon");
 154                         return(1);
 155                 }
 156                 /* Be evil: truncate strings with \n in them silently. */
 157                 if (arg[i] == '\n') {
 158                         arg[i] = '\0';
 159                         return(0);
 160                 }
 161         }
 162         return(0);
 163 }
 164
 165 static int
 166 validate_master(struct passwd *opw __unused, struct x_master_passwd *npw)
 167 {
 168
 169         if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
 170                 yp_error("client tried to modify an NIS entry");
 171                 return(1);
 172         }
 173
 174         if (validchars(npw->pw_shell)) {
 175                 yp_error("specified shell contains invalid characters");
 176                 return(1);
 177         }
 178
 179         if (validchars(npw->pw_gecos)) {
 180                 yp_error("specified gecos field contains invalid characters");
 181                 return(1);
 182         }
 183
 184         if (validchars(npw->pw_passwd)) {
 185                 yp_error("specified password contains invalid characters");
 186                 return(1);
 187         }
 188         return(0);
 189 }
 190
 191 static int
 192 validate(struct passwd *opw, struct x_passwd *npw)
 193 {
 194
 195         if (npw->pw_name[0] == '+' || npw->pw_name[0] == '-') {
 196                 yp_error("client tried to modify an NIS entry");
 197                 return(1);
 198         }
 199
 200         if ((uid_t)npw->pw_uid != opw->pw_uid) {
 201                 yp_error("UID mismatch: client says user %s has UID %d",
 202                          npw->pw_name, npw->pw_uid);
 203                 yp_error("database says user %s has UID %d", opw->pw_name,
 204                          opw->pw_uid);
 205                 return(1);
 206         }
 207
 208         if ((gid_t)npw->pw_gid != opw->pw_gid) {
 209                 yp_error("GID mismatch: client says user %s has GID %d",
 210                          npw->pw_name, npw->pw_gid);
 211                 yp_error("database says user %s has GID %d", opw->pw_name,
 212                          opw->pw_gid);
 213                 return(1);
 214         }
 215
 216         /*
 217          * Don't allow the user to shoot himself in the foot,
 218          * even on purpose.
 219          */
 220         if (!no_chsh && !ok_shell(npw->pw_shell)) {
 221                 yp_error("%s is not a valid shell", npw->pw_shell);
 222                 return(1);
 223         }
 224
 225         if (!no_chsh && validchars(npw->pw_shell)) {
 226                 yp_error("specified shell contains invalid characters");
 227                 return(1);
 228         }
 229
 230         if (validchars(npw->pw_gecos)) {
 231                 yp_error("specified gecos field contains invalid characters");
 232                 return(1);
 233         }
 234
 235         if (validchars(npw->pw_passwd)) {
 236                 yp_error("specified password contains invalid characters");
 237                 return(1);
 238         }
 239         return(0);
 240 }
 241
 242 /*
 243  * Kludge alert:
 244  * In order to have one rpc.yppasswdd support multiple domains,
 245  * we have to cheat: we search each directory under /var/yp
 246  * and try to match the user in each master.passwd.byname
 247  * map that we find. If the user matches (username, uid and gid
 248  * all agree), then we use that domain. If we match the user in
 249  * more than one database, we must abort.
 250  */
 251 static char *
 252 find_domain(struct x_passwd *pw)
 253 {
 254         struct stat statbuf;
 255         struct dirent *dirp;
 256         DIR *dird;
 257         char yp_mapdir[MAXPATHLEN + 2];
 258         static char domain[YPMAXDOMAIN];
 259         char *tmp = NULL;
 260         DBT key, data;
 261         int hit = 0;
 262
 263         yp_error("performing multidomain lookup");
 264
 265         if ((dird = opendir(yp_dir)) == NULL) {
 266                 yp_error("opendir(%s) failed: %s", yp_dir, strerror(errno));
 267                 return(NULL);
 268         }
 269
 270         while ((dirp = readdir(dird)) != NULL) {
 271                 snprintf(yp_mapdir, sizeof yp_mapdir, "%s/%s",
 272                                                         yp_dir, dirp->d_name);
 273                 if (stat(yp_mapdir, &statbuf) < 0) {
 274                         yp_error("stat(%s) failed: %s", yp_mapdir,
 275                                                         strerror(errno));
 276                         closedir(dird);
 277                         return(NULL);
 278                 }
 279                 if (S_ISDIR(statbuf.st_mode)) {
 280                         tmp = (char *)dirp->d_name;
 281                         key.data = pw->pw_name;
 282                         key.size = strlen(pw->pw_name);
 283
 284                         if (yp_get_record(tmp,"master.passwd.byname",
 285                                         &key, &data, 0) != YP_TRUE) {
 286                                 continue;
 287                         }
 288                         *((char *)data.data + data.size) = '\0';
 289                         copy_yp_pass(data.data, 1, data.size);
 290                         if (yp_password.pw_uid == (uid_t)pw->pw_uid &&
 291                             yp_password.pw_gid == (gid_t)pw->pw_gid) {
 292                                 hit++;
 293                                 snprintf(domain, YPMAXDOMAIN, "%s", tmp);
 294                         }
 295                 }
 296         }
 297
 298         closedir(dird);
 299         if (hit > 1) {
 300                 yp_error("found same user in two different domains");
 301                 return(NULL);
 302         } else
 303                 return((char *)&domain);
 304 }
 305
 306 static const char *maps[] = {
 307         "master.passwd.byname",
 308         "master.passwd.byuid",
 309         "passwd.byname",
 310         "passwd.byuid"
 311 };
 312
 313 static const char *formats[] = {
 314         "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 315         "%s:%s:%d:%d:%s:%ld:%ld:%s:%s:%s",
 316         "%s:%s:%d:%d:%s:%s:%s",
 317         "%s:%s:%d:%d:%s:%s:%s"
 318 };
 319
 320 static int
 321 update_inplace(struct passwd *pw, char *domain)
 322 {
 323         DB *dbp = NULL;
 324         DBT key = { NULL, 0 };
 325         DBT data = { NULL, 0 };
 326         char *pwbuf;
 327         char keybuf[20];
 328         int i;
 329         char *ptr = NULL;
 330         static char yp_last[] = "YP_LAST_MODIFIED";
 331         char yplastbuf[64];
 332
 333         snprintf(yplastbuf, sizeof yplastbuf, "%llu",
 334             (unsigned long long)time(NULL));
 335         pwbuf = NULL;
 336
 337         for (i = 0; i < 4; i++) {
 338
 339                 if (i % 2) {
 340                         snprintf(keybuf, sizeof keybuf,
 341                             "%llu", (unsigned long long)pw->pw_uid);
 342                         key.data = &keybuf;
 343                         key.size = strlen(keybuf);
 344                 } else {
 345                         key.data = pw->pw_name;
 346                         key.size = strlen(pw->pw_name);
 347                 }
 348
 349                 /*
 350                  * XXX The passwd.byname and passwd.byuid maps come in
 351                  * two flavors: secure and insecure. The secure version
 352                  * has a '*' in the password field whereas the insecure one
 353                  * has a real crypted password. The maps will be insecure
 354                  * if they were built with 'unsecure = TRUE' enabled in
 355                  * /var/yp/Makefile, but we'd have no way of knowing if
 356                  * this has been done unless we were to try parsing the
 357                  * Makefile, which is a disgusting thought. Instead, we
 358                  * read the records from the maps, skip to the first ':'
 359                  * in them, and then look at the character immediately
 360                  * following it. If it's an '*' then the map is 'secure'
 361                  * and we must not insert a real password into the pw_passwd
 362                  * field. If it's not an '*', then we put the real crypted
 363                  * password in.
 364                  */
 365                 if (yp_get_record(domain,maps[i],&key,&data,1) != YP_TRUE) {
 366                         yp_error("couldn't read %s/%s: %s", domain,
 367                                                 maps[i], strerror(errno));
 368                         goto ret1;
 369                 }
 370
 371                 if ((ptr = strchr(data.data, ':')) == NULL) {
 372                         yp_error("no colon in passwd record?!");
 373                         goto ret1;
 374                 }
 375
 376                 /*
 377                  * XXX Supposing we have more than one user with the same
 378                  * UID? (Or more than one user with the same name?) We could
 379                  * end up modifying the wrong record if were not careful.
 380                  */
 381                 if (i % 2) {
 382                         if (strncmp(data.data, pw->pw_name,
 383                                                         strlen(pw->pw_name))) {
 384                                 yp_error("warning: found entry for UID %d \
 385 in map %s@%s with wrong name (%.*s)", pw->pw_uid, maps[i], domain,
 386                                     (int)(ptr - (char *)data.data),
 387                                     (char *)data.data);
 388                                 yp_error("there may be more than one user \
 389 with the same UID - continuing");
 390                                 continue;
 391                         }
 392                 } else {
 393                         /*
 394                          * We're really being ultra-paranoid here.
 395                          * This is generally a 'can't happen' condition.
 396                          */
 397                         free(pwbuf);
 398                         asprintf(&pwbuf, ":%d:%d:", pw->pw_uid, pw->pw_gid);
 399                         if (pwbuf == NULL) {
 400                                 yp_error("no memory");
 401                                 goto ret1;
 402                         }
 403                         if (!strstr(data.data, pwbuf)) {
 404                                 yp_error("warning: found entry for user %s \
 405 in map %s@%s with wrong UID", pw->pw_name, maps[i], domain);
 406                                 yp_error("there may be more than one user \
 407 with the same name - continuing");
 408                                 continue;
 409                         }
 410                 }
 411
 412                 if (i < 2) {
 413                         free(pwbuf);
 414                         asprintf(&pwbuf, formats[i],
 415                            pw->pw_name, pw->pw_passwd, pw->pw_uid,
 416                            pw->pw_gid, pw->pw_class, pw->pw_change,
 417                            pw->pw_expire, pw->pw_gecos, pw->pw_dir,
 418                            pw->pw_shell);
 419                 } else {
 420                         free(pwbuf);
 421                         asprintf(&pwbuf, formats[i],
 422                            pw->pw_name, *(ptr+1) == '*' ? "*" : pw->pw_passwd,
 423                            pw->pw_uid, pw->pw_gid, pw->pw_gecos, pw->pw_dir,
 424                            pw->pw_shell);
 425                 }
 426                 if (pwbuf == NULL) {
 427                         yp_error("no memory");
 428                         goto ret1;
 429                 }
 430
 431 #define FLAGS O_RDWR|O_CREAT
 432
 433                 if ((dbp = yp_open_db_rw(domain, maps[i], FLAGS)) == NULL) {
 434                         yp_error("couldn't open %s/%s r/w: %s",domain,
 435                                                 maps[i],strerror(errno));
 436                         goto ret1;
 437                 }
 438
 439                 data.data = pwbuf;
 440                 data.size = strlen(pwbuf);
 441
 442                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
 443                         yp_error("failed to update record in %s/%s", domain,
 444                                                                 maps[i]);
 445                         (void)(dbp->close)(dbp);
 446                         goto ret1;
 447                 }
 448
 449                 key.data = yp_last;
 450                 key.size = strlen(yp_last);
 451                 data.data = (char *)&yplastbuf;
 452                 data.size = strlen(yplastbuf);
 453
 454                 if (yp_put_record(dbp, &key, &data, 1) != YP_TRUE) {
 455                         yp_error("failed to update timestamp in %s/%s", domain,
 456                                                                 maps[i]);
 457                         (void)(dbp->close)(dbp);
 458                         goto ret1;
 459                 }
 460
 461                 (void)(dbp->close)(dbp);
 462         }
 463
 464         free(pwbuf);
 465         return (0);
 466 ret1:
 467         free(pwbuf);
 468         return (1);
 469 }
 470
 471 int *
 472 yppasswdproc_update_1_svc(yppasswd *argp, struct svc_req *rqstp)
 473 {
 474         static int  result;
 475         struct sockaddr_in *rqhost;
 476         DBT key, data;
 477         int rval = 0;
 478         int pfd, tfd;
 479         int pid;
 480         int passwd_changed = 0;
 481         int shell_changed = 0;
 482         int gecos_changed = 0;
 483         char *cryptpw;
 484         char *oldshell = NULL;
 485         char *oldgecos = NULL;
 486         char *passdir;
 487         char *passfile_hold;
 488         char passdir_buf[MAXPATHLEN + 2];
 489         char passfile_buf[MAXPATHLEN + 2];
 490         char passfile_hold_buf[MAXPATHLEN + 2];
 491         char *domain = yppasswd_domain;
 492         static struct sockaddr_in clntaddr;
 493         static struct timeval t_saved, t_test;
 494
 495         /*
 496          * Normal user updates always use the 'default' master.passwd file.
 497          */
 498
 499         passfile = passfile_default;
 500         result = 1;
 501
 502         rqhost = svc_getcaller(rqstp->rq_xprt);
 503
 504         gettimeofday(&t_test, NULL);
 505         if (!bcmp(rqhost, &clntaddr, sizeof *rqhost) &&
 506                 t_test.tv_sec > t_saved.tv_sec &&
 507                 t_test.tv_sec - t_saved.tv_sec < 300) {
 508
 509                 bzero(&clntaddr, sizeof clntaddr);
 510                 bzero(&t_saved, sizeof t_saved);
 511                 return(NULL);
 512         }
 513
 514         bcopy(rqhost, &clntaddr, sizeof clntaddr);
 515         gettimeofday(&t_saved, NULL);
 516
 517         if (yp_access(resvport ? "master.passwd.byname" : NULL, rqstp)) {
 518                 yp_error("rejected update request from unauthorized host");
 519                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 520                 return(&result);
 521         }
 522
 523         /*
 524          * Step one: find the user. (It's kinda pointless to
 525          * proceed if the user doesn't exist.) We look for the
 526          * user in the master.passwd.byname database, _NOT_ by
 527          * using getpwent() and friends! We can't use getpwent()
 528          * since the NIS master server is not guaranteed to be
 529          * configured as an NIS client.
 530          */
 531
 532         if (multidomain) {
 533                 if ((domain = find_domain(&argp->newpw)) == NULL) {
 534                         yp_error("multidomain lookup failed - aborting update");
 535                         return(&result);
 536                 } else
 537                         yp_error("updating user %s in domain %s",
 538                                         argp->newpw.pw_name, domain);
 539         }
 540
 541         key.data = argp->newpw.pw_name;
 542         key.size = strlen(argp->newpw.pw_name);
 543
 544         if ((rval = yp_get_record(domain,"master.passwd.byname",
 545                         &key, &data, 0)) != YP_TRUE) {
 546                 if (rval == YP_NOKEY) {
 547                         yp_error("user %s not found in passwd database",
 548                                 argp->newpw.pw_name);
 549                 } else {
 550                         yp_error("database access error: %s",
 551                                 yperr_string(rval));
 552                 }
 553                 return(&result);
 554         }
 555
 556         /* Nul terminate, please. */
 557         *((char *)data.data + data.size) = '\0';
 558
 559         copy_yp_pass(data.data, 1, data.size);
 560
 561         /* Step 2: check that the supplied oldpass is valid. */
 562
 563         cryptpw = crypt(argp->oldpass, yp_password.pw_passwd);
 564         if (cryptpw == NULL || strcmp(cryptpw, yp_password.pw_passwd)) {
 565                 yp_error("rejected change attempt -- bad password");
 566                 yp_error("client address: %s username: %s",
 567                           inet_ntoa(rqhost->sin_addr),
 568                           argp->newpw.pw_name);
 569                 return(&result);
 570         }
 571
 572         /* Step 3: validate the arguments passed to us by the client. */
 573
 574         if (validate(&yp_password, &argp->newpw)) {
 575                 yp_error("rejecting change attempt: bad arguments");
 576                 yp_error("client address: %s username: %s",
 577                          inet_ntoa(rqhost->sin_addr),
 578                          argp->newpw.pw_name);
 579                 svcerr_decode(rqstp->rq_xprt);
 580                 return(&result);
 581         }
 582
 583         /* Step 4: update the user's passwd structure. */
 584
 585         if (!no_chsh && strcmp(argp->newpw.pw_shell, yp_password.pw_shell)) {
 586                 oldshell = yp_password.pw_shell;
 587                 yp_password.pw_shell = argp->newpw.pw_shell;
 588                 shell_changed++;
 589         }
 590
 591
 592         if (!no_chfn && strcmp(argp->newpw.pw_gecos, yp_password.pw_gecos)) {
 593                 oldgecos = yp_password.pw_gecos;
 594                 yp_password.pw_gecos = argp->newpw.pw_gecos;
 595                 gecos_changed++;
 596         }
 597
 598         if (strcmp(argp->newpw.pw_passwd, yp_password.pw_passwd)) {
 599                 yp_password.pw_passwd = argp->newpw.pw_passwd;
 600                 yp_password.pw_change = 0;
 601                 passwd_changed++;
 602         }
 603
 604         /*
 605          * If the caller specified a domain other than our 'default'
 606          * domain, change the path to master.passwd accordingly.
 607          */
 608
 609         if (strcmp(domain, yppasswd_domain)) {
 610                 snprintf(passfile_buf, sizeof(passfile_buf),
 611                         "%s/%s/master.passwd", yp_dir, domain);
 612                 passfile = (char *)&passfile_buf;
 613         }
 614
 615         /*
 616          * Create a filename to hold the original master.passwd
 617          * so if our call to yppwupdate fails we can roll back
 618          */
 619         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 620             "%s.hold", passfile);
 621         passfile_hold = (char *)&passfile_hold_buf;
 622
 623
 624         /* Step 5: make a new password file with the updated info. */
 625
 626         snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile);
 627         passdir = dirname(passdir_buf);
 628
 629         if (pw_init(passdir, passfile)) {
 630                 yp_error("pw_init() failed");
 631                 return &result;
 632         }
 633         if ((pfd = pw_lock()) == -1) {
 634                 pw_fini();
 635                 yp_error("pw_lock() failed");
 636                 return &result;
 637         }
 638         if ((tfd = pw_tmp(-1)) == -1) {
 639                 pw_fini();
 640                 yp_error("pw_tmp() failed");
 641                 return &result;
 642         }
 643         if (pw_copy(pfd, tfd, &yp_password, NULL) == -1) {
 644                 pw_fini();
 645                 yp_error("pw_copy() failed");
 646                 return &result;
 647         }
 648         if (rename(passfile, passfile_hold) == -1) {
 649                 pw_fini();
 650                 yp_error("rename of %s to %s failed", passfile,
 651                     passfile_hold);
 652                 return &result;
 653         }
 654
 655         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 656                 /*
 657                  * NIS server is exporting the system's master.passwd.
 658                  * Call pw_mkdb to rebuild passwd and the .db files
 659                  */
 660                 if (pw_mkdb(yp_password.pw_name) == -1) {
 661                         pw_fini();
 662                         yp_error("pw_mkdb() failed");
 663                         rename(passfile_hold, passfile);
 664                         return &result;
 665                 }
 666         } else {
 667                 /*
 668                  * NIS server is exporting a private master.passwd.
 669                  * Rename tempfile into final location
 670                  */
 671                 if (rename(pw_tempname(), passfile) == -1) {
 672                         pw_fini();
 673                         yp_error("rename of %s to %s failed",
 674                             pw_tempname(), passfile);
 675                         rename(passfile_hold, passfile);
 676                         return &result;
 677                 }
 678         }
 679
 680         pw_fini();
 681
 682         if (inplace) {
 683                 if ((rval = update_inplace(&yp_password, domain))) {
 684                         yp_error("inplace update failed -- rebuilding maps");
 685                 }
 686         }
 687
 688         switch ((pid = fork())) {
 689         case 0:
 690                 if (inplace && !rval) {
 691                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 692                                 yppasswd_domain, "pushpw", (char *)NULL);
 693                 } else {
 694                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 695                                 yppasswd_domain, (char *)NULL);
 696                 }
 697                 yp_error("couldn't exec map update process: %s",
 698                                         strerror(errno));
 699                 unlink(passfile);
 700                 rename(passfile_hold, passfile);
 701                 exit(1);
 702                 break;
 703         case -1:
 704                 yp_error("fork() failed: %s", strerror(errno));
 705                 unlink(passfile);
 706                 rename(passfile_hold, passfile);
 707                 return(&result);
 708                 break;
 709         default:
 710                 unlink(passfile_hold);
 711                 break;
 712         }
 713
 714         if (verbose) {
 715                 yp_error("update completed for user %s (uid %d) in %s:",
 716                     argp->newpw.pw_name, argp->newpw.pw_uid, passfile);
 717
 718                 if (passwd_changed)
 719                         yp_error("password changed");
 720
 721                 if (gecos_changed)
 722                         yp_error("gecos changed ('%s' -> '%s')",
 723                                         oldgecos, argp->newpw.pw_gecos);
 724
 725                 if (shell_changed)
 726                         yp_error("shell changed ('%s' -> '%s')",
 727                                         oldshell, argp->newpw.pw_shell);
 728         }
 729
 730         result = 0;
 731         return (&result);
 732 }
 733
 734 /*
 735  * Note that this function performs a little less sanity checking
 736  * than the last one. Since only the superuser is allowed to use it,
 737  * it is assumed that the caller knows what he's doing.
 738  */
 739 int *
 740 yppasswdproc_update_master_1_svc(master_yppasswd *argp,
 741     struct svc_req *rqstp)
 742 {
 743         static int result;
 744         int pfd, tfd;
 745         int pid;
 746         uid_t uid;
 747         int rval = 0;
 748         DBT key, data;
 749         char *passdir;
 750         char *passfile_hold;
 751         char passdir_buf[MAXPATHLEN + 2];
 752         char passfile_buf[MAXPATHLEN + 2];
 753         char passfile_hold_buf[MAXPATHLEN + 2];
 754         struct sockaddr_in *rqhost;
 755         SVCXPRT *transp;
 756         struct passwd newpasswd;
 757
 758         result = 1;
 759         transp = rqstp->rq_xprt;
 760
 761         /*
 762          * NO AF_INET CONNETCIONS ALLOWED!
 763          */
 764         rqhost = svc_getcaller(transp);
 765         if (rqhost->sin_family != AF_UNIX) {
 766                 yp_error("Alert! %s/%d attempted to use superuser-only \
 767 procedure!\n", inet_ntoa(rqhost->sin_addr), rqhost->sin_port);
 768                 svcerr_auth(transp, AUTH_BADCRED);
 769                 return(&result);
 770         }
 771
 772         if (rqstp->rq_cred.oa_flavor != AUTH_SYS) {
 773                 yp_error("caller didn't send proper credentials");
 774                 svcerr_auth(transp, AUTH_BADCRED);
 775                 return(&result);
 776         }
 777
 778         if (__rpc_get_local_uid(transp, &uid) < 0) {
 779                 yp_error("caller didn't send proper credentials");
 780                 svcerr_auth(transp, AUTH_BADCRED);
 781                 return(&result);
 782         }
 783
 784         if (uid) {
 785                 yp_error("caller euid is %d, expecting 0 -- rejecting request",
 786                     uid);
 787                 svcerr_auth(rqstp->rq_xprt, AUTH_BADCRED);
 788                 return(&result);
 789         }
 790
 791         passfile = passfile_default;
 792
 793         key.data = argp->newpw.pw_name;
 794         key.size = strlen(argp->newpw.pw_name);
 795
 796         /*
 797          * The superuser may add entries to the passwd maps if
 798          * rpc.yppasswdd is started with the -a flag. Paranoia
 799          * prevents me from allowing additions by default.
 800          */
 801         if ((rval = yp_get_record(argp->domain, "master.passwd.byname",
 802                           &key, &data, 0)) != YP_TRUE) {
 803                 if (rval == YP_NOKEY) {
 804                         yp_error("user %s not found in passwd database",
 805                                  argp->newpw.pw_name);
 806                         if (allow_additions)
 807                                 yp_error("notice: adding user %s to \
 808 master.passwd database for domain %s", argp->newpw.pw_name, argp->domain);
 809                         else
 810                                 yp_error("restart rpc.yppasswdd with the -a flag to \
 811 allow additions to be made to the password database");
 812                 } else {
 813                         yp_error("database access error: %s",
 814                                  yperr_string(rval));
 815                 }
 816                 if (!allow_additions)
 817                         return(&result);
 818         } else {
 819
 820                 /* Nul terminate, please. */
 821                 *((char *)data.data + data.size) = '\0';
 822
 823                 copy_yp_pass(data.data, 1, data.size);
 824         }
 825
 826         /*
 827          * Perform a small bit of sanity checking.
 828          */
 829         if (validate_master(rval == YP_TRUE ? &yp_password:NULL,&argp->newpw)){
 830                 yp_error("rejecting update attempt for %s: bad arguments",
 831                          argp->newpw.pw_name);
 832                 return(&result);
 833         }
 834
 835         /*
 836          * If the caller specified a domain other than our 'default'
 837          * domain, change the path to master.passwd accordingly.
 838          */
 839
 840         if (strcmp(argp->domain, yppasswd_domain)) {
 841                 snprintf(passfile_buf, sizeof(passfile_buf),
 842                         "%s/%s/master.passwd", yp_dir, argp->domain);
 843                 passfile = (char *)&passfile_buf;
 844         }
 845
 846         /*
 847          * Create a filename to hold the original master.passwd
 848          * so if our call to yppwupdate fails we can roll back
 849          */
 850         snprintf(passfile_hold_buf, sizeof(passfile_hold_buf),
 851             "%s.hold", passfile);
 852         passfile_hold = (char *)&passfile_hold_buf;
 853
 854         snprintf(passdir_buf, sizeof(passdir_buf), "%s", passfile);
 855         passdir = dirname(passdir_buf);
 856
 857         if (pw_init(passdir, passfile)) {
 858                 yp_error("pw_init() failed");
 859                 return &result;
 860         }
 861         if ((pfd = pw_lock()) == -1) {
 862                 pw_fini();
 863                 yp_error("pw_lock() failed");
 864                 return &result;
 865         }
 866         if ((tfd = pw_tmp(-1)) == -1) {
 867                 pw_fini();
 868                 yp_error("pw_tmp() failed");
 869                 return &result;
 870         }
 871         xlate_passwd(&argp->newpw, &newpasswd);
 872         if (pw_copy(pfd, tfd, &newpasswd, NULL) == -1) {
 873                 pw_fini();
 874                 yp_error("pw_copy() failed");
 875                 return &result;
 876         }
 877         if (rename(passfile, passfile_hold) == -1) {
 878                 pw_fini();
 879                 yp_error("rename of %s to %s failed", passfile,
 880                     passfile_hold);
 881                 return &result;
 882         }
 883         if (strcmp(passfile, _PATH_MASTERPASSWD) == 0) {
 884                 /*
 885                  * NIS server is exporting the system's master.passwd.
 886                  * Call pw_mkdb to rebuild passwd and the .db files
 887                  */
 888                 if (pw_mkdb(argp->newpw.pw_name) == -1) {
 889                         pw_fini();
 890                         yp_error("pw_mkdb() failed");
 891                         rename(passfile_hold, passfile);
 892                         return &result;
 893                 }
 894         } else {
 895                 /*
 896                  * NIS server is exporting a private master.passwd.
 897                  * Rename tempfile into final location
 898                  */
 899                 if (rename(pw_tempname(), passfile) == -1) {
 900                         pw_fini();
 901                         yp_error("rename of %s to %s failed",
 902                             pw_tempname(), passfile);
 903                         rename(passfile_hold, passfile);
 904                         return &result;
 905                 }
 906         }
 907         pw_fini();
 908
 909         if (inplace) {
 910                 xlate_passwd(&argp->newpw, &newpasswd);
 911                 if ((rval = update_inplace(&newpasswd, argp->domain))) {
 912                         yp_error("inplace update failed -- rebuilding maps");
 913                 }
 914         }
 915
 916         switch ((pid = fork())) {
 917         case 0:
 918                 if (inplace && !rval) {
 919                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 920                                 argp->domain, "pushpw", (char *)NULL);
 921                 } else {
 922                         execlp(MAP_UPDATE_PATH, MAP_UPDATE, passfile,
 923                                 argp->domain, (char *)NULL);
 924                 }
 925                 yp_error("couldn't exec map update process: %s",
 926                                         strerror(errno));
 927                 unlink(passfile);
 928                 rename(passfile_hold, passfile);
 929                 exit(1);
 930                 break;
 931         case -1:
 932                 yp_error("fork() failed: %s", strerror(errno));
 933                 unlink(passfile);
 934                 rename(passfile_hold, passfile);
 935                 return(&result);
 936                 break;
 937         default:
 938                 unlink(passfile_hold);
 939                 break;
 940         }
 941
 942         yp_error("performed update of user %s (uid %d) domain %s",
 943                                                 argp->newpw.pw_name,
 944                                                 argp->newpw.pw_uid,
 945                                                 argp->domain);
 946
 947         result = 0;
 948         return(&result);
 949 }