pw_group.c revision 20679
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 * $Id: pw_group.c,v 1.1.1.3 1996/12/10 23:59:01 joerg Exp $ 27 */ 28 29#include <unistd.h> 30#include <ctype.h> 31#include <termios.h> 32 33#include "pw.h" 34#include "bitmap.h" 35 36 37static int print_group(struct group * grp, int pretty); 38static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args); 39 40int 41pw_group(struct userconf * cnf, int mode, struct cargs * args) 42{ 43 struct carg *a_name = getarg(args, 'n'); 44 struct carg *a_gid = getarg(args, 'g'); 45 struct carg *arg; 46 struct group *grp = NULL; 47 char *members[_UC_MAXGROUPS]; 48 49 static struct group fakegroup = 50 { 51 "nogroup", 52 "*", 53 -1, 54 NULL 55 }; 56 57 /* 58 * With M_NEXT, we only need to return the 59 * next gid to stdout 60 */ 61 if (mode == M_NEXT) 62 { 63 gid_t next = gr_gidpolicy(cnf, args); 64 if (getarg(args, 'q')) 65 return next; 66 printf("%ld\n", (long)next); 67 return EXIT_SUCCESS; 68 } 69 70 if (mode == M_PRINT && getarg(args, 'a')) { 71 int pretty = getarg(args, 'P') != NULL; 72 73 setgrent(); 74 while ((grp = getgrent()) != NULL) 75 print_group(grp, pretty); 76 endgrent(); 77 return EXIT_SUCCESS; 78 } 79 if (a_gid == NULL) { 80 if (a_name == NULL) 81 cmderr(EX_DATAERR, "group name or id required\n"); 82 83 if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) { 84 (a_gid = a_name)->ch = 'g'; 85 a_name = NULL; 86 } 87 } 88 grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val)); 89 90 if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) { 91 if (a_name == NULL && grp == NULL) /* Try harder */ 92 grp = getgrgid(atoi(a_gid->val)); 93 94 if (grp == NULL) { 95 if (mode == M_PRINT && getarg(args, 'F')) { 96 fakegroup.gr_name = a_name ? a_name->val : "nogroup"; 97 fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1; 98 return print_group(&fakegroup, getarg(args, 'P') != NULL); 99 } 100 cmderr(EX_DATAERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val); 101 } 102 if (a_name == NULL) /* Needed later */ 103 a_name = addarg(args, 'n', grp->gr_name); 104 105 /* 106 * Handle deletions now 107 */ 108 if (mode == M_DELETE) { 109 gid_t gid = grp->gr_gid; 110 111 if (delgrent(grp) == -1) 112 cmderr(EX_IOERR, "Error updating group file: %s\n", strerror(errno)); 113 pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid); 114 return EXIT_SUCCESS; 115 } else if (mode == M_PRINT) 116 return print_group(grp, getarg(args, 'P') != NULL); 117 118 if (a_gid) 119 grp->gr_gid = (gid_t) atoi(a_gid->val); 120 121 if ((arg = getarg(args, 'l')) != NULL) 122 grp->gr_name = pw_checkname((u_char *)arg->val, 0); 123 } else { 124 if (a_name == NULL) /* Required */ 125 cmderr(EX_DATAERR, "group name required\n"); 126 else if (grp != NULL) /* Exists */ 127 cmderr(EX_DATAERR, "group name `%s' already exists\n", a_name->val); 128 129 memset(members, 0, sizeof members); 130 grp = &fakegroup; 131 grp->gr_name = pw_checkname((u_char *)a_name->val, 0); 132 grp->gr_passwd = "*"; 133 grp->gr_gid = gr_gidpolicy(cnf, args); 134 grp->gr_mem = members; 135 } 136 137 /* 138 * This allows us to set a group password Group passwords is an 139 * antique idea, rarely used and insecure (no secure database) Should 140 * be discouraged, but it is apparently still supported by some 141 * software. 142 */ 143 144 if ((arg = getarg(args, 'h')) != NULL) { 145 if (strcmp(arg->val, "-") == 0) 146 grp->gr_passwd = "*"; /* No access */ 147 else { 148 int fd = atoi(arg->val); 149 int b; 150 int istty = isatty(fd); 151 struct termios t; 152 char *p, line[256]; 153 154 if (istty) { 155 if (tcgetattr(fd, &t) == -1) 156 istty = 0; 157 else { 158 struct termios n = t; 159 160 /* Disable echo */ 161 n.c_lflag &= ~(ECHO); 162 tcsetattr(fd, TCSANOW, &n); 163 printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name); 164 fflush(stdout); 165 } 166 } 167 b = read(fd, line, sizeof(line) - 1); 168 if (istty) { /* Restore state */ 169 tcsetattr(fd, TCSANOW, &t); 170 fputc('\n', stdout); 171 fflush(stdout); 172 } 173 if (b < 0) { 174 perror("-h file descriptor"); 175 return EX_OSERR; 176 } 177 line[b] = '\0'; 178 if ((p = strpbrk(line, " \t\r\n")) != NULL) 179 *p = '\0'; 180 if (!*line) 181 cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd); 182 grp->gr_passwd = pw_pwcrypt(line); 183 } 184 } 185 186 if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) { 187 int i = 0; 188 char *p; 189 struct passwd *pwd; 190 191 if (arg->ch == 'm') { 192 while (i < _UC_MAXGROUPS && grp->gr_mem[i] != NULL) { 193 members[i] = grp->gr_mem[i]; 194 i++; 195 } 196 } 197 for (p = strtok(arg->val, ", \t"); i < _UC_MAXGROUPS && p != NULL; p = strtok(NULL, ", \t")) { 198 int j; 199 if ((pwd = getpwnam(p)) == NULL) { 200 if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL) 201 cmderr(EX_NOUSER, "user `%s' does not exist\n", p); 202 } 203 /* 204 * Check for duplicates 205 */ 206 for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++) 207 ; 208 if (j == i) 209 members[i++] = newstr(pwd->pw_name); 210 } 211 while (i < _UC_MAXGROUPS) 212 members[i++] = NULL; 213 grp->gr_mem = members; 214 } 215 216 if (getarg(args, 'N') != NULL) 217 return print_group(grp, getarg(args, 'P') != NULL); 218 219 if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) { 220 perror("group update"); 221 return EX_IOERR; 222 } 223 /* grp may have been invalidated */ 224 if ((grp = getgrnam(a_name->val)) == NULL) 225 cmderr(EX_SOFTWARE, "group disappeared during update\n"); 226 227 pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid); 228 229 return EXIT_SUCCESS; 230} 231 232 233static gid_t 234gr_gidpolicy(struct userconf * cnf, struct cargs * args) 235{ 236 struct group *grp; 237 gid_t gid = (gid_t) - 1; 238 struct carg *a_gid = getarg(args, 'g'); 239 240 /* 241 * Check the given gid, if any 242 */ 243 if (a_gid != NULL) { 244 gid = (gid_t) atol(a_gid->val); 245 246 if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL) 247 cmderr(EX_DATAERR, "gid `%ld' has already been allocated\n", (long) grp->gr_gid); 248 } else { 249 struct bitmap bm; 250 251 /* 252 * We need to allocate the next available gid under one of 253 * two policies a) Grab the first unused gid b) Grab the 254 * highest possible unused gid 255 */ 256 if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */ 257 cnf->min_gid = 1000; 258 cnf->max_gid = 32000; 259 } 260 bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1); 261 262 /* 263 * Now, let's fill the bitmap from the password file 264 */ 265 setgrent(); 266 while ((grp = getgrent()) != NULL) 267 if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid) 268 bm_setbit(&bm, grp->gr_gid - cnf->min_gid); 269 endgrent(); 270 271 /* 272 * Then apply the policy, with fallback to reuse if necessary 273 */ 274 if (cnf->reuse_gids) 275 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 276 else { 277 gid = (gid_t) (bm_lastset(&bm) + 1); 278 if (!bm_isset(&bm, gid)) 279 gid += cnf->min_gid; 280 else 281 gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid); 282 } 283 284 /* 285 * Another sanity check 286 */ 287 if (gid < cnf->min_gid || gid > cnf->max_gid) 288 cmderr(EX_SOFTWARE, "unable to allocate a new gid - range fully used\n"); 289 bm_dealloc(&bm); 290 } 291 return gid; 292} 293 294 295static int 296print_group(struct group * grp, int pretty) 297{ 298 if (!pretty) { 299 char buf[_UC_MAXLINE]; 300 301 fmtgrent(buf, grp); 302 fputs(buf, stdout); 303 } else { 304 int i; 305 306 printf("Group Name : %-10s #%lu\n" 307 " Members : ", 308 grp->gr_name, (long) grp->gr_gid); 309 for (i = 0; i < _UC_MAXGROUPS && grp->gr_mem[i]; i++) 310 printf("%s%s", i ? "," : "", grp->gr_mem[i]); 311 fputs("\n\n", stdout); 312 } 313 return EXIT_SUCCESS; 314} 315