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