315 lines
8.6 KiB
C
315 lines
8.6 KiB
C
/*-
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* Copyright (C) 1996
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* David L. Nugent. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $Id: pw_group.c,v 1.1.1.2 1996/12/09 23:55:25 joerg Exp $
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*/
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#include <unistd.h>
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#include <ctype.h>
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#include <termios.h>
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#include "pw.h"
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#include "bitmap.h"
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static int print_group(struct group * grp, int pretty);
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static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args);
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int
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pw_group(struct userconf * cnf, int mode, struct cargs * args)
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{
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struct carg *a_name = getarg(args, 'n');
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struct carg *a_gid = getarg(args, 'g');
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struct carg *arg;
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struct group *grp = NULL;
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char *members[_UC_MAXGROUPS];
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static struct group fakegroup =
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{
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"nogroup",
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"*",
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-1,
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NULL
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};
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/*
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* With M_NEXT, we only need to return the
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* next gid to stdout
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*/
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if (mode == M_NEXT)
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{
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gid_t next = gr_gidpolicy(cnf, args);
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if (getarg(args, 'q'))
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return next;
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printf("%ld\n", (long)next);
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return EXIT_SUCCESS;
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}
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if (mode == M_PRINT && getarg(args, 'a')) {
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int pretty = getarg(args, 'P') != NULL;
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setgrent();
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while ((grp = getgrent()) != NULL)
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print_group(grp, pretty);
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endgrent();
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return EXIT_SUCCESS;
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}
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if (a_gid == NULL) {
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if (a_name == NULL)
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cmderr(EX_DATAERR, "group name or id required\n");
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if (mode != M_ADD && grp == NULL && isdigit(*a_name->val)) {
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(a_gid = a_name)->ch = 'g';
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a_name = NULL;
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}
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}
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grp = (a_name != NULL) ? getgrnam(a_name->val) : getgrgid((gid_t) atoi(a_gid->val));
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if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
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if (a_name == NULL && grp == NULL) /* Try harder */
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grp = getgrgid(atoi(a_gid->val));
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if (grp == NULL) {
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if (mode == M_PRINT && getarg(args, 'F')) {
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fakegroup.gr_name = a_name ? a_name->val : "nogroup";
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fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
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return print_group(&fakegroup, getarg(args, 'P') != NULL);
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}
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cmderr(EX_DATAERR, "unknown group `%s'\n", a_name ? a_name->val : a_gid->val);
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}
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if (a_name == NULL) /* Needed later */
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a_name = addarg(args, 'n', grp->gr_name);
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/*
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* Handle deletions now
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*/
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if (mode == M_DELETE) {
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gid_t gid = grp->gr_gid;
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if (delgrent(grp) == -1)
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cmderr(EX_IOERR, "Error updating group file: %s\n", strerror(errno));
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pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
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return EXIT_SUCCESS;
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} else if (mode == M_PRINT)
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return print_group(grp, getarg(args, 'P') != NULL);
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if (a_gid)
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grp->gr_gid = (gid_t) atoi(a_gid->val);
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if ((arg = getarg(args, 'l')) != NULL)
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grp->gr_name = arg->val;
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} else {
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if (a_name == NULL) /* Required */
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cmderr(EX_DATAERR, "group name required\n");
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else if (grp != NULL) /* Exists */
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cmderr(EX_DATAERR, "group name `%s' already exists\n", a_name->val);
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memset(members, 0, sizeof members);
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grp = &fakegroup;
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grp->gr_name = a_name->val;
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grp->gr_passwd = "*";
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grp->gr_gid = gr_gidpolicy(cnf, args);
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grp->gr_mem = members;
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}
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/*
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* This allows us to set a group password Group passwords is an
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* antique idea, rarely used and insecure (no secure database) Should
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* be discouraged, but it is apparently still supported by some
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* software.
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*/
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if ((arg = getarg(args, 'h')) != NULL) {
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if (strcmp(arg->val, "-") == 0)
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grp->gr_passwd = "*"; /* No access */
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else {
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int fd = atoi(arg->val);
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int b;
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int istty = isatty(fd);
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struct termios t;
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char *p, line[256];
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if (istty) {
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if (tcgetattr(fd, &t) == -1)
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istty = 0;
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else {
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struct termios n = t;
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/* Disable echo */
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n.c_lflag &= ~(ECHO);
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tcsetattr(fd, TCSANOW, &n);
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printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
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fflush(stdout);
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}
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}
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b = read(fd, line, sizeof(line) - 1);
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if (istty) { /* Restore state */
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tcsetattr(fd, TCSANOW, &t);
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fputc('\n', stdout);
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fflush(stdout);
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}
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if (b < 0) {
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perror("-h file descriptor");
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return EX_OSERR;
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}
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line[b] = '\0';
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if ((p = strpbrk(line, " \t\r\n")) != NULL)
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*p = '\0';
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if (!*line)
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cmderr(EX_DATAERR, "empty password read on file descriptor %d\n", fd);
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grp->gr_passwd = pw_pwcrypt(line);
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}
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}
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if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
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int i = 0;
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char *p;
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struct passwd *pwd;
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if (arg->ch == 'm') {
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while (i < _UC_MAXGROUPS && grp->gr_mem[i] != NULL) {
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members[i] = grp->gr_mem[i];
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i++;
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}
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}
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for (p = strtok(arg->val, ", \t"); i < _UC_MAXGROUPS && p != NULL; p = strtok(NULL, ", \t")) {
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int j;
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if ((pwd = getpwnam(p)) == NULL) {
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if (!isdigit(*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
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cmderr(EX_NOUSER, "user `%s' does not exist\n", p);
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}
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/*
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* Check for duplicates
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*/
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for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
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;
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if (j == i)
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members[i++] = newstr(pwd->pw_name);
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}
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while (i < _UC_MAXGROUPS)
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members[i++] = NULL;
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grp->gr_mem = members;
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}
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if (getarg(args, 'N') != NULL)
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return print_group(grp, getarg(args, 'P') != NULL);
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if ((mode == M_ADD && !addgrent(grp)) || (mode == M_UPDATE && !chggrent(a_name->val, grp))) {
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perror("group update");
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return EX_IOERR;
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}
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/* grp may have been invalidated */
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if ((grp = getgrnam(a_name->val)) == NULL)
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cmderr(EX_SOFTWARE, "group disappeared during update\n");
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pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
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return EXIT_SUCCESS;
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}
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static gid_t
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gr_gidpolicy(struct userconf * cnf, struct cargs * args)
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{
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struct group *grp;
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gid_t gid = (gid_t) - 1;
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struct carg *a_gid = getarg(args, 'g');
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/*
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* Check the given gid, if any
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*/
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if (a_gid != NULL) {
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gid = (gid_t) atol(a_gid->val);
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if ((grp = getgrgid(gid)) != NULL && getarg(args, 'o') == NULL)
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cmderr(EX_DATAERR, "gid `%ld' has already been allocated\n", (long) grp->gr_gid);
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} else {
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struct bitmap bm;
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/*
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* We need to allocate the next available gid under one of
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* two policies a) Grab the first unused gid b) Grab the
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* highest possible unused gid
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*/
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if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */
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cnf->min_gid = 1000;
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cnf->max_gid = 32000;
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}
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bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
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/*
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* Now, let's fill the bitmap from the password file
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*/
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setgrent();
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while ((grp = getgrent()) != NULL)
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if (grp->gr_gid >= (int) cnf->min_gid && grp->gr_gid <= (int) cnf->max_gid)
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bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
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endgrent();
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/*
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* Then apply the policy, with fallback to reuse if necessary
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*/
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if (cnf->reuse_gids)
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gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
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else {
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gid = (gid_t) (bm_lastset(&bm) + 1);
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if (!bm_isset(&bm, gid))
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gid += cnf->min_gid;
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else
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gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
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}
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/*
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* Another sanity check
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*/
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if (gid < cnf->min_gid || gid > cnf->max_gid)
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cmderr(EX_SOFTWARE, "unable to allocate a new gid - range fully used\n");
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bm_dealloc(&bm);
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}
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return gid;
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}
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static int
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print_group(struct group * grp, int pretty)
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{
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if (!pretty) {
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char buf[_UC_MAXLINE];
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fmtgrent(buf, grp);
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fputs(buf, stdout);
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} else {
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int i;
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printf("Group Name : %-10s #%lu\n"
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" Members : ",
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grp->gr_name, (long) grp->gr_gid);
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for (i = 0; i < _UC_MAXGROUPS && grp->gr_mem[i]; i++)
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printf("%s%s", i ? "," : "", grp->gr_mem[i]);
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fputs("\n\n", stdout);
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}
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return EXIT_SUCCESS;
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}
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