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, int pretty);
  48 static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  49
  50 int
  51 pw_group(struct userconf * cnf, int mode, struct cargs * args)
  52 {
  53         int             rc;
  54         struct carg    *a_newname = getarg(args, 'l');
  55         struct carg    *a_name = getarg(args, 'n');
  56         struct carg    *a_gid = getarg(args, 'g');
  57         struct carg    *arg;
  58         struct group   *grp = NULL;
  59         int             grmembers = 0;
  60         char           **members = NULL;
  61
  62         static struct group fakegroup =
  63         {
  64                 "nogroup",
  65                 "*",
  66                 -1,
  67                 NULL
  68         };
  69
  70         if (a_gid != NULL) {
  71                 if (strspn(a_gid->val, "0123456789") != strlen(a_gid->val))
  72                         errx(EX_USAGE, "-g expects a number");
  73         }
  74
  75         if (mode == M_LOCK || mode == M_UNLOCK)
  76                 errx(EX_USAGE, "'lock' command is not available for groups");
  77
  78         /*
  79          * With M_NEXT, we only need to return the
  80          * next gid to stdout
  81          */
  82         if (mode == M_NEXT) {
  83                 gid_t next = gr_gidpolicy(cnf, args);
  84                 if (getarg(args, 'q'))
  85                         return next;
  86                 printf("%u\n", next);
  87                 return EXIT_SUCCESS;
  88         }
  89
  90         if (mode == M_PRINT && getarg(args, 'a')) {
  91                 int             pretty = getarg(args, 'P') != NULL;
  92
  93                 SETGRENT();
  94                 while ((grp = GETGRENT()) != NULL)
  95                         print_group(grp, pretty);
  96                 ENDGRENT();
  97                 return EXIT_SUCCESS;
  98         }
  99         if (a_gid == NULL) {
 100                 if (a_name == NULL)
 101                         errx(EX_DATAERR, "group name or id required");
 102
 103                 if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
 104                         (a_gid = a_name)->ch = 'g';
 105                         a_name = NULL;
 106                 }
 107         }
 108         grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
 109
 110         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
 111                 if (a_name == NULL && grp == NULL)      /* Try harder */
 112                         grp = GETGRGID(atoi(a_gid->val));
 113
 114                 if (grp == NULL) {
 115                         if (mode == M_PRINT && getarg(args, 'F')) {
 116                                 char    *fmems[1];
 117                                 fmems[0] = NULL;
 118                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
 119                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : (gid_t)-1;
 120                                 fakegroup.gr_mem = fmems;
 121                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
 122                         }
 123                         errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
 124                 }
 125                 if (a_name == NULL)     /* Needed later */
 126                         a_name = addarg(args, 'n', grp->gr_name);
 127
 128                 /*
 129                  * Handle deletions now
 130                  */
 131                 if (mode == M_DELETE) {
 132                         gid_t           gid = grp->gr_gid;
 133
 134                         rc = delgrent(grp);
 135                         if (rc == -1)
 136                                 err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
 137                         else if (rc != 0) {
 138                                 err(EX_IOERR, "group update");
 139                         }
 140                         pw_log(cnf, mode, W_GROUP, "%s(%u) removed", a_name->val, gid);
 141                         return EXIT_SUCCESS;
 142                 } else if (mode == M_PRINT)
 143                         return print_group(grp, getarg(args, 'P') != NULL);
 144
 145                 if (a_gid)
 146                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 147
 148                 if (a_newname != NULL)
 149                         grp->gr_name = pw_checkname((u_char *)a_newname->val, 0);
 150         } else {
 151                 if (a_name == NULL)     /* Required */
 152                         errx(EX_DATAERR, "group name required");
 153                 else if (grp != NULL)   /* Exists */
 154                         errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
 155
 156                 extendarray(&members, &grmembers, 200);
 157                 members[0] = NULL;
 158                 grp = &fakegroup;
 159                 grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
 160                 grp->gr_passwd = "*";
 161                 grp->gr_gid = gr_gidpolicy(cnf, args);
 162                 grp->gr_mem = members;
 163         }
 164
 165         /*
 166          * This allows us to set a group password Group passwords is an
 167          * antique idea, rarely used and insecure (no secure database) Should
 168          * be discouraged, but it is apparently still supported by some
 169          * software.
 170          */
 171
 172         if ((arg = getarg(args, 'h')) != NULL ||
 173             (arg = getarg(args, 'H')) != NULL) {
 174                 if (strcmp(arg->val, "-") == 0)
 175                         grp->gr_passwd = "*";   /* No access */
 176                 else {
 177                         int             fd = atoi(arg->val);
 178                         int             precrypt = (arg->ch == 'H');
 179                         int             b;
 180                         int             istty = isatty(fd);
 181                         struct termios  t;
 182                         char           *p, line[256];
 183
 184                         if (istty) {
 185                                 if (tcgetattr(fd, &t) == -1)
 186                                         istty = 0;
 187                                 else {
 188                                         struct termios  n = t;
 189
 190                                         /* Disable echo */
 191                                         n.c_lflag &= ~(ECHO);
 192                                         tcsetattr(fd, TCSANOW, &n);
 193                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 194                                         fflush(stdout);
 195                                 }
 196                         }
 197                         b = read(fd, line, sizeof(line) - 1);
 198                         if (istty) {    /* Restore state */
 199                                 tcsetattr(fd, TCSANOW, &t);
 200                                 fputc('\n', stdout);
 201                                 fflush(stdout);
 202                         }
 203                         if (b < 0)
 204                                 err(EX_OSERR, "-h file descriptor");
 205                         line[b] = '\0';
 206                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 207                                 *p = '\0';
 208                         if (!*line)
 209                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 210                         if (precrypt) {
 211                                 if (strchr(line, ':') != NULL)
 212                                         return EX_DATAERR;
 213                                 grp->gr_passwd = line;
 214                         } else
 215                                 grp->gr_passwd = pw_pwcrypt(line);
 216                 }
 217         }
 218
 219         if (((arg = getarg(args, 'M')) != NULL ||
 220             (arg = getarg(args, 'd')) != NULL ||
 221             (arg = getarg(args, 'm')) != NULL) && arg->val) {
 222                 int     i = 0;
 223                 char   *p;
 224                 struct passwd   *pwd;
 225
 226                 /* Make sure this is not stay NULL with -M "" */
 227                 extendarray(&members, &grmembers, 200);
 228                 if (arg->ch == 'd')
 229                         delete_members(&members, &grmembers, &i, arg, grp);
 230                 else if (arg->ch == 'm') {
 231                         int     k = 0;
 232
 233                         if (grp->gr_mem != NULL) {
 234                                 while (grp->gr_mem[k] != NULL) {
 235                                         if (extendarray(&members, &grmembers, i + 2) != -1)
 236                                                 members[i++] = grp->gr_mem[k];
 237                                         k++;
 238                                 }
 239                         }
 240                 }
 241
 242                 if (arg->ch != 'd')
 243                         for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 244                                 int     j;
 245
 246                                 /*
 247                                  * Check for duplicates
 248                                  */
 249                                 pwd = lookup_pwent(p);
 250                                 for (j = 0; j < i && strcmp(members[j], pwd->pw_name) != 0; j++)
 251                                         ;
 252                                 if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 253                                         members[i++] = newstr(pwd->pw_name);
 254                         }
 255                 while (i < grmembers)
 256                         members[i++] = NULL;
 257                 grp->gr_mem = members;
 258         }
 259
 260         if (getarg(args, 'N') != NULL)
 261                 return print_group(grp, getarg(args, 'P') != NULL);
 262
 263         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 264                 if (rc == -1)
 265                         errx(EX_IOERR, "group '%s' already exists",
 266                             grp->gr_name);
 267                 else
 268                         err(EX_IOERR, "group update");
 269         } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
 270                 if (rc == -1)
 271                         errx(EX_IOERR, "group '%s' not available (NIS?)",
 272                             grp->gr_name);
 273                 else
 274                         err(EX_IOERR, "group update");
 275         }
 276
 277         arg = a_newname != NULL ? a_newname : a_name;
 278         /* grp may have been invalidated */
 279         if ((grp = GETGRNAM(arg->val)) == NULL)
 280                 errx(EX_SOFTWARE, "group disappeared during update");
 281
 282         pw_log(cnf, mode, W_GROUP, "%s(%u)", grp->gr_name, grp->gr_gid);
 283
 284         free(members);
 285
 286         return EXIT_SUCCESS;
 287 }
 288
 289
 290 /*
 291  * Lookup a passwd entry using a name or UID.
 292  */
 293 static struct passwd *
 294 lookup_pwent(const char *user)
 295 {
 296         struct passwd *pwd;
 297
 298         if ((pwd = GETPWNAM(user)) == NULL &&
 299             (!isdigit((unsigned char)*user) ||
 300             (pwd = getpwuid((uid_t) atoi(user))) == NULL))
 301                 errx(EX_NOUSER, "user `%s' does not exist", user);
 302
 303         return (pwd);
 304 }
 305
 306
 307 /*
 308  * Delete requested members from a group.
 309  */
 310 static void
 311 delete_members(char ***members, int *grmembers, int *i, struct carg *arg,
 312     struct group *grp)
 313 {
 314         bool matchFound;
 315         char *user;
 316         char *valueCopy;
 317         char *valuePtr;
 318         int k;
 319         struct passwd *pwd;
 320
 321         if (grp->gr_mem == NULL)
 322                 return;
 323
 324         k = 0;
 325         while (grp->gr_mem[k] != NULL) {
 326                 matchFound = false;
 327                 if ((valueCopy = strdup(arg->val)) == NULL)
 328                         errx(EX_UNAVAILABLE, "out of memory");
 329                 valuePtr = valueCopy;
 330                 while ((user = strsep(&valuePtr, ", \t")) != NULL) {
 331                         pwd = lookup_pwent(user);
 332                         if (strcmp(grp->gr_mem[k], pwd->pw_name) == 0) {
 333                                 matchFound = true;
 334                                 break;
 335                         }
 336                 }
 337                 free(valueCopy);
 338
 339                 if (!matchFound &&
 340                     extendarray(members, grmembers, *i + 2) != -1)
 341                         (*members)[(*i)++] = grp->gr_mem[k];
 342
 343                 k++;
 344         }
 345
 346         return;
 347 }
 348
 349
 350 static          gid_t
 351 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 352 {
 353         struct group   *grp;
 354         gid_t           gid = (gid_t) - 1;
 355         struct carg    *a_gid = getarg(args, 'g');
 356
 357         /*
 358          * Check the given gid, if any
 359          */
 360         if (a_gid != NULL) {
 361                 gid = (gid_t) atol(a_gid->val);
 362
 363                 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
 364                         errx(EX_DATAERR, "gid `%u' has already been allocated", grp->gr_gid);
 365         } else {
 366                 struct bitmap   bm;
 367
 368                 /*
 369                  * We need to allocate the next available gid under one of
 370                  * two policies a) Grab the first unused gid b) Grab the
 371                  * highest possible unused gid
 372                  */
 373                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 374                         cnf->min_gid = 1000;
 375                         cnf->max_gid = 32000;
 376                 }
 377                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 378
 379                 /*
 380                  * Now, let's fill the bitmap from the password file
 381                  */
 382                 SETGRENT();
 383                 while ((grp = GETGRENT()) != NULL)
 384                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 385                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 386                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 387                 ENDGRENT();
 388
 389                 /*
 390                  * Then apply the policy, with fallback to reuse if necessary
 391                  */
 392                 if (cnf->reuse_gids)
 393                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 394                 else {
 395                         gid = (gid_t) (bm_lastset(&bm) + 1);
 396                         if (!bm_isset(&bm, gid))
 397                                 gid += cnf->min_gid;
 398                         else
 399                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 400                 }
 401
 402                 /*
 403                  * Another sanity check
 404                  */
 405                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 406                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 407                 bm_dealloc(&bm);
 408         }
 409         return gid;
 410 }
 411
 412
 413 static int
 414 print_group(struct group * grp, int pretty)
 415 {
 416         if (!pretty) {
 417                 char           *buf = NULL;
 418
 419                 buf = gr_make(grp);
 420                 printf("%s\n", buf);
 421                 free(buf);
 422         } else {
 423                 int             i;
 424
 425                 printf("Group Name: %-15s   #%lu\n"
 426                        "   Members: ",
 427                        grp->gr_name, (long) grp->gr_gid);
 428                 if (grp->gr_mem != NULL) {
 429                         for (i = 0; grp->gr_mem[i]; i++)
 430                                 printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 431                 }
 432                 fputs("\n\n", stdout);
 433         }
 434         return EXIT_SUCCESS;
 435 }