usr.sbin/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  * $FreeBSD: src/usr.sbin/pw/pw_group.c,v 1.12.2.1 2000/06/28 19:19:04 ache Exp $
  27  * $DragonFly: src/usr.sbin/pw/pw_group.c,v 1.3 2004/09/25 20:38:21 dillon Exp $
  28  */
  29
  30 #include <ctype.h>
  31 #include <err.h>
  32 #include <termios.h>
  33 #include <unistd.h>
  34
  35 #include "pw.h"
  36 #include "bitmap.h"
  37
  38
  39 static int      print_group(struct group * grp, int pretty);
  40 static gid_t    gr_gidpolicy(struct userconf * cnf, struct cargs * args);
  41
  42 static
  43 int
  44 alldigits(const char *str)
  45 {
  46         while (*str) {
  47                 if (*str < '0' || *str > '9')
  48                         return(0);
  49                 ++str;
  50         }
  51         return(1);
  52 }
  53
  54 int
  55 pw_group(struct userconf * cnf, int mode, struct cargs * args)
  56 {
  57         int             rc;
  58         struct carg    *a_name = getarg(args, 'n');
  59         struct carg    *a_gid = getarg(args, 'g');
  60         struct carg    *arg;
  61         struct group   *grp = NULL;
  62         int             grmembers = 0;
  63         char           **members = NULL;
  64
  65         static struct group fakegroup =
  66         {
  67                 "nogroup",
  68                 "*",
  69                 -1,
  70                 NULL
  71         };
  72
  73         if (mode == M_LOCK || mode == M_UNLOCK)
  74                 errx(EX_USAGE, "'lock' command is not available for groups");
  75
  76         /*
  77          * With M_NEXT, we only need to return the
  78          * next gid to stdout
  79          */
  80         if (mode == M_NEXT) {
  81                 gid_t next = gr_gidpolicy(cnf, args);
  82                 if (getarg(args, 'q'))
  83                         return next;
  84                 printf("%ld\n", (long)next);
  85                 return EXIT_SUCCESS;
  86         }
  87
  88         if (mode == M_PRINT && getarg(args, 'a')) {
  89                 int             pretty = getarg(args, 'P') != NULL;
  90
  91                 SETGRENT();
  92                 while ((grp = GETGRENT()) != NULL)
  93                         print_group(grp, pretty);
  94                 ENDGRENT();
  95                 return EXIT_SUCCESS;
  96         }
  97         if (a_gid == NULL) {
  98                 if (a_name == NULL)
  99                         errx(EX_DATAERR, "group name or id required");
 100
 101                 if (mode != M_ADD && grp == NULL && alldigits(a_name->val)) {
 102                         (a_gid = a_name)->ch = 'g';
 103                         a_name = NULL;
 104                 }
 105         }
 106         grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
 107
 108         if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
 109                 if (a_name == NULL && grp == NULL)      /* Try harder */
 110                         grp = GETGRGID(atoi(a_gid->val));
 111
 112                 if (grp == NULL) {
 113                         if (mode == M_PRINT && getarg(args, 'F')) {
 114                                 char    *fmems[1];
 115                                 fmems[0] = NULL;
 116                                 fakegroup.gr_name = a_name ? a_name->val : "nogroup";
 117                                 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
 118                                 fakegroup.gr_mem = fmems;
 119                                 return print_group(&fakegroup, getarg(args, 'P') != NULL);
 120                         }
 121                         errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
 122                 }
 123                 if (a_name == NULL)     /* Needed later */
 124                         a_name = addarg(args, 'n', grp->gr_name);
 125
 126                 /*
 127                  * Handle deletions now
 128                  */
 129                 if (mode == M_DELETE) {
 130                         gid_t           gid = grp->gr_gid;
 131
 132                         rc = delgrent(grp);
 133                         if (rc == -1)
 134                                 err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
 135                         else if (rc != 0) {
 136                                 warn("group update");
 137                                 return EX_IOERR;
 138                         }
 139                         pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
 140                         return EXIT_SUCCESS;
 141                 } else if (mode == M_PRINT)
 142                         return print_group(grp, getarg(args, 'P') != NULL);
 143
 144                 if (a_gid)
 145                         grp->gr_gid = (gid_t) atoi(a_gid->val);
 146
 147                 if ((arg = getarg(args, 'l')) != NULL)
 148                         grp->gr_name = pw_checkname((u_char *)arg->val, 0);
 149         } else {
 150                 if (a_name == NULL)     /* Required */
 151                         errx(EX_DATAERR, "group name required");
 152                 else if (grp != NULL)   /* Exists */
 153                         errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
 154
 155                 extendarray(&members, &grmembers, 200);
 156                 members[0] = NULL;
 157                 grp = &fakegroup;
 158                 grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
 159                 grp->gr_passwd = "*";
 160                 grp->gr_gid = gr_gidpolicy(cnf, args);
 161                 grp->gr_mem = members;
 162         }
 163
 164         /*
 165          * This allows us to set a group password Group passwords is an
 166          * antique idea, rarely used and insecure (no secure database) Should
 167          * be discouraged, but it is apparently still supported by some
 168          * software.
 169          */
 170
 171         if ((arg = getarg(args, 'h')) != NULL) {
 172                 if (strcmp(arg->val, "-") == 0)
 173                         grp->gr_passwd = "*";   /* No access */
 174                 else {
 175                         int             fd = atoi(arg->val);
 176                         int             b;
 177                         int             istty = isatty(fd);
 178                         struct termios  t;
 179                         char           *p, line[256];
 180
 181                         if (istty) {
 182                                 if (tcgetattr(fd, &t) == -1)
 183                                         istty = 0;
 184                                 else {
 185                                         struct termios  n = t;
 186
 187                                         /* Disable echo */
 188                                         n.c_lflag &= ~(ECHO);
 189                                         tcsetattr(fd, TCSANOW, &n);
 190                                         printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
 191                                         fflush(stdout);
 192                                 }
 193                         }
 194                         b = read(fd, line, sizeof(line) - 1);
 195                         if (istty) {    /* Restore state */
 196                                 tcsetattr(fd, TCSANOW, &t);
 197                                 fputc('\n', stdout);
 198                                 fflush(stdout);
 199                         }
 200                         if (b < 0) {
 201                                 warn("-h file descriptor");
 202                                 return EX_OSERR;
 203                         }
 204                         line[b] = '\0';
 205                         if ((p = strpbrk(line, " \t\r\n")) != NULL)
 206                                 *p = '\0';
 207                         if (!*line)
 208                                 errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
 209                         grp->gr_passwd = pw_pwcrypt(line);
 210                 }
 211         }
 212
 213         if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
 214                 int     i = 0;
 215                 char   *p;
 216                 struct passwd   *pwd;
 217
 218                 /* Make sure this is not stay NULL with -M "" */
 219                 extendarray(&members, &grmembers, 200);
 220                 if (arg->ch == 'm') {
 221                         int     k = 0;
 222
 223                         while (grp->gr_mem[k] != NULL) {
 224                                 if (extendarray(&members, &grmembers, i + 2) != -1) {
 225                                         members[i++] = grp->gr_mem[k];
 226                                 }
 227                                 k++;
 228                         }
 229                 }
 230                 for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
 231                         int     j;
 232                         if ((pwd = GETPWNAM(p)) == NULL) {
 233                                 if (!isdigit((unsigned char)*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
 234                                         errx(EX_NOUSER, "user `%s' does not exist", p);
 235                         }
 236                         /*
 237                          * Check for duplicates
 238                          */
 239                         for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
 240                                 ;
 241                         if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
 242                                 members[i++] = newstr(pwd->pw_name);
 243                 }
 244                 while (i < grmembers)
 245                         members[i++] = NULL;
 246                 grp->gr_mem = members;
 247         }
 248
 249         if (getarg(args, 'N') != NULL)
 250                 return print_group(grp, getarg(args, 'P') != NULL);
 251
 252         if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
 253                 if (rc == -1)
 254                         warnx("group '%s' already exists", grp->gr_name);
 255                 else
 256                         warn("group update");
 257                 return EX_IOERR;
 258         } else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
 259                 if (rc == -1)
 260                         warnx("group '%s' not available (NIS?)", grp->gr_name);
 261                 else
 262                         warn("group update");
 263                 return EX_IOERR;
 264         }
 265         /* grp may have been invalidated */
 266         if ((grp = GETGRNAM(a_name->val)) == NULL)
 267                 errx(EX_SOFTWARE, "group disappeared during update");
 268
 269         pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
 270
 271         if (members)
 272                 free(members);
 273
 274         return EXIT_SUCCESS;
 275 }
 276
 277
 278 static          gid_t
 279 gr_gidpolicy(struct userconf * cnf, struct cargs * args)
 280 {
 281         struct group   *grp;
 282         gid_t           gid = (gid_t) - 1;
 283         struct carg    *a_gid = getarg(args, 'g');
 284
 285         /*
 286          * Check the given gid, if any
 287          */
 288         if (a_gid != NULL) {
 289                 gid = (gid_t) atol(a_gid->val);
 290
 291                 if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
 292                         errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
 293         } else {
 294                 struct bitmap   bm;
 295
 296                 /*
 297                  * We need to allocate the next available gid under one of
 298                  * two policies a) Grab the first unused gid b) Grab the
 299                  * highest possible unused gid
 300                  */
 301                 if (cnf->min_gid >= cnf->max_gid) {     /* Sanity claus^H^H^H^Hheck */
 302                         cnf->min_gid = 1000;
 303                         cnf->max_gid = 32000;
 304                 }
 305                 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
 306
 307                 /*
 308                  * Now, let's fill the bitmap from the password file
 309                  */
 310                 SETGRENT();
 311                 while ((grp = GETGRENT()) != NULL)
 312                         if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
 313                             (gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
 314                                 bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
 315                 ENDGRENT();
 316
 317                 /*
 318                  * Then apply the policy, with fallback to reuse if necessary
 319                  */
 320                 if (cnf->reuse_gids)
 321                         gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 322                 else {
 323                         gid = (gid_t) (bm_lastset(&bm) + 1);
 324                         if (!bm_isset(&bm, gid))
 325                                 gid += cnf->min_gid;
 326                         else
 327                                 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
 328                 }
 329
 330                 /*
 331                  * Another sanity check
 332                  */
 333                 if (gid < cnf->min_gid || gid > cnf->max_gid)
 334                         errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
 335                 bm_dealloc(&bm);
 336         }
 337         return gid;
 338 }
 339
 340
 341 static int
 342 print_group(struct group * grp, int pretty)
 343 {
 344         if (!pretty) {
 345                 int             buflen = 0;
 346                 char           *buf = NULL;
 347
 348                 fmtgrent(&buf, &buflen, grp);
 349                 fputs(buf, stdout);
 350                 free(buf);
 351         } else {
 352                 int             i;
 353
 354                 printf("Group Name: %-15s   #%lu\n"
 355                        "   Members: ",
 356                        grp->gr_name, (long) grp->gr_gid);
 357                 for (i = 0; grp->gr_mem[i]; i++)
 358                         printf("%s%s", i ? "," : "", grp->gr_mem[i]);
 359                 fputs("\n\n", stdout);
 360         }
 361         return EXIT_SUCCESS;
 362 }