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