pw/pw_group.c

   1 /*-
   2  * Copyright (C) 1996
   3  *      David L. Nugent.  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  *
  14  * THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #ifndef lint
  28 static const char rcsid[] =
  29   "$FreeBSD$";
  30 #endif /* not lint */
  31
  32 #include <ctype.h>
  33 #include <err.h>
  34 #include <termios.h>
  35 #include <stdbool.h>
  36 #include <unistd.h>
  37 #include <grp.h>
  38 #include <libutil.h>
  39
  40 #include "pw.h"
  41 #include "bitmap.h"
  42
  43
  44 static struct passwd *lookup_pwent(const char *user);
  45 static void     delete_members(char ***members, int *grmembers, int *i,
  46     struct carg *arg, struct group *grp);
  47 static int      print_group(struct group * grp);
  48 static gid_t    gr_gidpolicy(struct userconf * cnf, long id);
  49
  50 static void
  51 set_passwd(struct group *grp, bool update)
  52 {
  53         int              b;
  54         int              istty;
  55         struct termios   t, n;
  56         char            *p, line[256];
  57
  58         if (conf.fd == '-') {
  59                 grp->gr_passwd = "*";   /* No access */
  60                 return;
  61         }
  62
  63         if ((istty = isatty(conf.fd))) {
  64                 n = t;
  65                 /* Disable echo */
  66                 n.c_lflag &= ~(ECHO);
  67                 tcsetattr(conf.fd, TCSANOW, &n);
  68                 printf("%sassword for group %s:", update ? "New p" : "P",
  69                     grp->gr_name);
  70                 fflush(stdout);
  71         }
  72         b = read(conf.fd, line, sizeof(line) - 1);
  73         if (istty) {    /* Restore state */
  74                 tcsetattr(conf.fd, TCSANOW, &t);
  75                 fputc('\n', stdout);
  76                 fflush(stdout);
  77         }
  78         if (b < 0)
  79                 err(EX_OSERR, "-h file descriptor");
  80         line[b] = '\0';
  81         if ((p = strpbrk(line, " \t\r\n")) != NULL)
  82                 *p = '\0';
  83         if (!*line)
  84                 errx(EX_DATAERR, "empty password read on file descriptor %d",
  85                     conf.fd);
  86         if (conf.precrypted) {
  87                 if (strchr(line, ':') != 0)
  88                         errx(EX_DATAERR, "wrong encrypted passwrd");
  89                 grp->gr_passwd = line;
  90         } else
  91                 grp->gr_passwd = pw_pwcrypt(line);
  92 }
  93
  94 int
  95 pw_groupnext(struct userconf *cnf, bool quiet)
  96 {
  97         gid_t next = gr_gidpolicy(cnf, -1);
  98
  99         if (quiet)
 100                 return (next);
 101         printf("%u\n", next);
 102
 103         return (EXIT_SUCCESS);
 104 }
 105
 106 int
 107 pw_group(int mode, char *name, long id, struct cargs * args)
 108 {
 109         int             rc;
 110         struct carg    *arg;
 111         struct group   *grp = NULL;
 112         int             grmembers = 0;
 113         char           **members = NULL;
 114         struct userconf *cnf = conf.userconf;
 115
 116         static struct group fakegroup =
 117         {
 118                 "nogroup",
 119                 "*",
 120                 -1,
 121                 NULL
 122         };
 123
 124         if (mode == M_NEXT)
 125                 return (pw_groupnext(cnf, getarg(args, 'q') != NULL));
 126
 127         if (mode == M_LOCK || mode == M_UNLOCK)
 128                 errx(EX_USAGE, "'lock' command is not available for groups");
 129
 130         if (mode == M_PRINT && getarg(args, 'a')) {
 131                 SETGRENT();
 132                 while ((grp = GETGRENT()) != NULL)
 133                         print_group(grp);
 134                 ENDGRENT();
 135                 return EXIT_SUCCESS;
 136         }
 137         if (id < 0 && name == NULL)
 138                 errx(EX_DATAERR, "group name or id required");
 139
 140         grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
 141
 142         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
 143                 if (name == NULL && grp == NULL)        /* Try harder */
 144                         grp = GETGRGID(id);
 145
 146                 if (grp == NULL) {
 147                         if (mode == M_PRINT && getarg(args, 'F')) {
 148                                 char    *fmems[1];
 149                                 fmems[0] = NULL;
 150                                 fakegroup.gr_name = name ? name : "nogroup";
 151                                 fakegroup.gr_gid = (gid_t) id;
 152                                 fakegroup.gr_mem = fmems;
 153                                 return print_group(&fakegroup);
 154                         }
 155                         if (name == NULL)
 156                                 errx(EX_DATAERR, "unknown group `%s'", name);
 157                         else
 158                                 errx(EX_DATAERR, "unknown group `%ld'", id);
 159                 }
 160                 if (name == NULL)       /* Needed later */
 161                         name = grp->gr_name;
 162
 163                 /*
 164                  * Handle deletions now
 165                  */
 166                 if (mode == M_DELETE) {
 167                         rc = delgrent(grp);
 168                         if (rc == -1)
 169                                 err(EX_IOERR, "group '%s' not available (NIS?)",
 170                                     name);
 171                         else if (rc != 0) {
 172                                 err(EX_IOERR, "group update");
 173                         }
 174                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", name, id);
 175                         return EXIT_SUCCESS;
 176                 } else if (mode == M_PRINT)
 177                         return print_group(grp);
 178
 179                 if (id > 0)
 180                         grp->gr_gid = (gid_t) id;
 181
 182                 if (conf.newname != NULL)
 183                         grp->gr_name = pw_checkname(conf.newname, 0);
 184         } else {
 185                 if (name == NULL)       /* Required */
 186                         errx(EX_DATAERR, "group name required");
 187                 else if (grp != NULL)   /* Exists */
 188                         errx(EX_DATAERR, "group name `%s' already exists", name);
 189
 190                 extendarray(&members, &grmembers, 200);
 191                 members[0] = NULL;
 192                 grp = &fakegroup;
 193                 grp->gr_name = pw_checkname(name, 0);
 194                 grp->gr_passwd = "*";
 195                 grp->gr_gid = gr_gidpolicy(cnf, id);
 196                 grp->gr_mem = members;
 197         }
 198
 199         /*
 200          * This allows us to set a group password Group passwords is an
 201          * antique idea, rarely used and insecure (no secure database) Should
 202          * be discouraged, but it is apparently still supported by some
 203          * software.
 204          */
 205
 206         if (conf.which == W_GROUP && conf.fd != -1)
 207                 set_passwd(grp, mode == M_UPDATE);
 208
 209         if (((arg = getarg(args, 'M')) != NULL ||
 210             (arg = getarg(args, 'd')) != NULL ||
 211             (arg = getarg(args, 'm')) != NULL) && arg->val) {
 212                 int     i = 0;
 213                 char   *p;
 214                 struct passwd   *pwd;
 215
 216                 /* Make sure this is not stay NULL with -M "" */
 217                 extendarray(&members, &grmembers, 200);
 218                 if (arg->ch == 'd')
 219                         delete_members(&members, &grmembers, &i, arg, grp);
 220                 else if (arg->ch == 'm') {
 221                         int     k = 0;
 222
 223                         if (grp->gr_mem != NULL) {
 224                                 while (grp->gr_mem[k] != NULL) {
 225                                         if (extendarray(&members, &grmembers, i + 2) != -1)
 226                                                 members[i++] = grp->gr_mem[k];
 227                                         k++;
 228                                 }
 229                         }
 230                 }
 231
 232                 if (arg->ch != 'd')
 233                         for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 234                                 int     j;
 235
 236                                 /*
 237                                  * Check for duplicates
 238                                  */
 239                                 pwd = lookup_pwent(p);
 240                                 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++)
 241                                         ;
 242                                 if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 243                                         members[i++] = newstr(pwd->pw_name);
 244                         }
 245                 while (i < grmembers)
 246                         members[i++] = NULL;
 247                 grp->gr_mem = members;
 248         }
 249
 250         if (conf.dryrun)
 251                 return print_group(grp);
 252
 253         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 254                 if (rc == -1)
 255                         errx(EX_IOERR, "group '%s' already exists",
 256                             grp->gr_name);
 257                 else
 258                         err(EX_IOERR, "group update");
 259         } else if (mode == M_UPDATE && (rc = chggrent(name, grp)) != 0) {
 260                 if (rc == -1)
 261                         errx(EX_IOERR, "group '%s' not available (NIS?)",
 262                             grp->gr_name);
 263                 else
 264                         err(EX_IOERR, "group update");
 265         }
 266
 267         if (conf.newname != NULL)
 268                 name = conf.newname;
 269         /* grp may have been invalidated */
 270         if ((grp = GETGRNAM(name)) == NULL)
 271                 errx(EX_SOFTWARE, "group disappeared during update");
 272
 273         pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);
 274
 275         free(members);
 276
 277         return EXIT_SUCCESS;
 278 }
 279
 280
 281 /*
 282  * Lookup a passwd entry using a name or UID.
 283  */
 284 static struct passwd *
 285 lookup_pwent(const char *user)
 286 {
 287         struct passwd *pwd;
 288
 289         if ((pwd = GETPWNAM(user)) == NULL &&
 290             (!isdigit((unsigned char)*user) ||
 291             (pwd = getpwuid((uid_t) atoi(user))) == NULL))
 292                 errx(EX_NOUSER, "user `%s' does not exist", user);
 293
 294         return (pwd);
 295 }
 296
 297
 298 /*
 299  * Delete requested members from a group.
 300  */
 301 static void
 302 delete_members(char ***members, int *grmembers, int *i, struct carg *arg,
 303     struct group *grp)
 304 {
 305         bool matchFound;
 306         char *user;
 307         char *valueCopy;
 308         char *valuePtr;
 309         int k;
 310         struct passwd *pwd;
 311
 312         if (grp->gr_mem == NULL)
 313                 return;
 314
 315         k = 0;
 316         while (grp->gr_mem[k] != NULL) {
 317                 matchFound = false;
 318                 if ((valueCopy = strdup(arg->val)) == NULL)
 319                         errx(EX_UNAVAILABLE, "out of memory");
 320                 valuePtr = valueCopy;
 321                 while ((user = strsep(&valuePtr, ", \t")) != NULL) {
 322                         pwd = lookup_pwent(user);
 323                         if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) {
 324                                 matchFound = true;
 325                                 break;
 326                         }
 327                 }
 328                 free(valueCopy);
 329
 330                 if (!matchFound &&
 331                     extendarray(members, grmembers, *i + 2) != -1)
 332                         (*members)[(*i)++] = grp->gr_mem[k];
 333
 334                 k++;
 335         }
 336
 337         return;
 338 }
 339
 340
 341 static          gid_t
 342 gr_gidpolicy(struct userconf * cnf, long id)
 343 {
 344         struct group   *grp;
 345         gid_t           gid = (gid_t) - 1;
 346
 347         /*
 348          * Check the given gid, if any
 349          */
 350         if (id > 0) {
 351                 gid = (gid_t) id;
 352
 353                 if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
 354                         errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
 355         } else {
 356                 struct bitmap   bm;
 357
 358                 /*
 359                  * We need to allocate the next available gid under one of
 360                  * two policies a) Grab the first unused gid b) Grab the
 361                  * highest possible unused gid
 362                  */
 363                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 364                         cnf->min_gid = 1000;
 365                         cnf->max_gid = 32000;
 366                 }
 367                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 368
 369                 /*
 370                  * Now, let's fill the bitmap from the password file
 371                  */
 372                 SETGRENT();
 373                 while ((grp = GETGRENT()) != NULL)
 374                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 375                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 376                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 377                 ENDGRENT();
 378
 379                 /*
 380                  * Then apply the policy, with fallback to reuse if necessary
 381                  */
 382                 if (cnf->reuse_gids)
 383                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 384                 else {
 385                         gid = (gid_t) (bm_lastset(&bm) + 1);
 386                         if (!bm_isset(&bm, gid))
 387                                 gid += cnf->min_gid;
 388                         else
 389                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 390                 }
 391
 392                 /*
 393                  * Another sanity check
 394                  */
 395                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 396                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 397                 bm_dealloc(&bm);
 398         }
 399         return gid;
 400 }
 401
 402
 403 static int
 404 print_group(struct group * grp)
 405 {
 406         if (!conf.pretty) {
 407                 char           *buf = NULL;
 408
 409                 buf = gr_make(grp);
 410                 printf("%s\n", buf);
 411                 free(buf);
 412         } else {
 413                 int             i;
 414
 415                 printf("Group Name: %-15s   #%lu\n"
 416                        "   Members: ",
 417                        grp->gr_name, (long) grp->gr_gid);
 418                 if (grp->gr_mem != NULL) {
 419                         for (i = 0; grp->gr_mem[i]; i++)
 420                                 printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 421                 }
 422                 fputs("\n\n", stdout);
 423         }
 424         return EXIT_SUCCESS;
 425 }