FreeBSD-5.3/usr.sbin/pw/pw_group.c
/*-
* Copyright (C) 1996
* David L. Nugent. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY DAVID L. NUGENT AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL DAVID L. NUGENT OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char rcsid[] =
"$FreeBSD: src/usr.sbin/pw/pw_group.c,v 1.14 2004/01/11 18:28:08 iedowse Exp $";
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <termios.h>
#include <unistd.h>
#include "pw.h"
#include "bitmap.h"
static int print_group(struct group * grp, int pretty);
static gid_t gr_gidpolicy(struct userconf * cnf, struct cargs * args);
int
pw_group(struct userconf * cnf, int mode, struct cargs * args)
{
int rc;
struct carg *a_name = getarg(args, 'n');
struct carg *a_gid = getarg(args, 'g');
struct carg *arg;
struct group *grp = NULL;
int grmembers = 0;
char **members = NULL;
static struct group fakegroup =
{
"nogroup",
"*",
-1,
NULL
};
if (mode == M_LOCK || mode == M_UNLOCK)
errx(EX_USAGE, "'lock' command is not available for groups");
/*
* With M_NEXT, we only need to return the
* next gid to stdout
*/
if (mode == M_NEXT) {
gid_t next = gr_gidpolicy(cnf, args);
if (getarg(args, 'q'))
return next;
printf("%ld\n", (long)next);
return EXIT_SUCCESS;
}
if (mode == M_PRINT && getarg(args, 'a')) {
int pretty = getarg(args, 'P') != NULL;
SETGRENT();
while ((grp = GETGRENT()) != NULL)
print_group(grp, pretty);
ENDGRENT();
return EXIT_SUCCESS;
}
if (a_gid == NULL) {
if (a_name == NULL)
errx(EX_DATAERR, "group name or id required");
if (mode != M_ADD && grp == NULL && isdigit((unsigned char)*a_name->val)) {
(a_gid = a_name)->ch = 'g';
a_name = NULL;
}
}
grp = (a_name != NULL) ? GETGRNAM(a_name->val) : GETGRGID((gid_t) atoi(a_gid->val));
if (mode == M_UPDATE || mode == M_DELETE || mode == M_PRINT) {
if (a_name == NULL && grp == NULL) /* Try harder */
grp = GETGRGID(atoi(a_gid->val));
if (grp == NULL) {
if (mode == M_PRINT && getarg(args, 'F')) {
char *fmems[1];
fmems[0] = NULL;
fakegroup.gr_name = a_name ? a_name->val : "nogroup";
fakegroup.gr_gid = a_gid ? (gid_t) atol(a_gid->val) : -1;
fakegroup.gr_mem = fmems;
return print_group(&fakegroup, getarg(args, 'P') != NULL);
}
errx(EX_DATAERR, "unknown group `%s'", a_name ? a_name->val : a_gid->val);
}
if (a_name == NULL) /* Needed later */
a_name = addarg(args, 'n', grp->gr_name);
/*
* Handle deletions now
*/
if (mode == M_DELETE) {
gid_t gid = grp->gr_gid;
rc = delgrent(grp);
if (rc == -1)
err(EX_IOERR, "group '%s' not available (NIS?)", grp->gr_name);
else if (rc != 0) {
warn("group update");
return EX_IOERR;
}
pw_log(cnf, mode, W_GROUP, "%s(%ld) removed", a_name->val, (long) gid);
return EXIT_SUCCESS;
} else if (mode == M_PRINT)
return print_group(grp, getarg(args, 'P') != NULL);
if (a_gid)
grp->gr_gid = (gid_t) atoi(a_gid->val);
if ((arg = getarg(args, 'l')) != NULL)
grp->gr_name = pw_checkname((u_char *)arg->val, 0);
} else {
if (a_name == NULL) /* Required */
errx(EX_DATAERR, "group name required");
else if (grp != NULL) /* Exists */
errx(EX_DATAERR, "group name `%s' already exists", a_name->val);
extendarray(&members, &grmembers, 200);
members[0] = NULL;
grp = &fakegroup;
grp->gr_name = pw_checkname((u_char *)a_name->val, 0);
grp->gr_passwd = "*";
grp->gr_gid = gr_gidpolicy(cnf, args);
grp->gr_mem = members;
}
/*
* This allows us to set a group password Group passwords is an
* antique idea, rarely used and insecure (no secure database) Should
* be discouraged, but it is apparently still supported by some
* software.
*/
if ((arg = getarg(args, 'h')) != NULL ||
(arg = getarg(args, 'H')) != NULL) {
if (strcmp(arg->val, "-") == 0)
grp->gr_passwd = "*"; /* No access */
else {
int fd = atoi(arg->val);
int precrypt = (arg->ch == 'H');
int b;
int istty = isatty(fd);
struct termios t;
char *p, line[256];
if (istty) {
if (tcgetattr(fd, &t) == -1)
istty = 0;
else {
struct termios n = t;
/* Disable echo */
n.c_lflag &= ~(ECHO);
tcsetattr(fd, TCSANOW, &n);
printf("%sassword for group %s:", (mode == M_UPDATE) ? "New p" : "P", grp->gr_name);
fflush(stdout);
}
}
b = read(fd, line, sizeof(line) - 1);
if (istty) { /* Restore state */
tcsetattr(fd, TCSANOW, &t);
fputc('\n', stdout);
fflush(stdout);
}
if (b < 0) {
warn("-h file descriptor");
return EX_OSERR;
}
line[b] = '\0';
if ((p = strpbrk(line, " \t\r\n")) != NULL)
*p = '\0';
if (!*line)
errx(EX_DATAERR, "empty password read on file descriptor %d", fd);
if (precrypt) {
if (strchr(line, ':') != NULL)
return EX_DATAERR;
grp->gr_passwd = line;
} else
grp->gr_passwd = pw_pwcrypt(line);
}
}
if (((arg = getarg(args, 'M')) != NULL || (arg = getarg(args, 'm')) != NULL) && arg->val) {
int i = 0;
char *p;
struct passwd *pwd;
/* Make sure this is not stay NULL with -M "" */
extendarray(&members, &grmembers, 200);
if (arg->ch == 'm') {
int k = 0;
while (grp->gr_mem[k] != NULL) {
if (extendarray(&members, &grmembers, i + 2) != -1) {
members[i++] = grp->gr_mem[k];
}
k++;
}
}
for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
int j;
if ((pwd = GETPWNAM(p)) == NULL) {
if (!isdigit((unsigned char)*p) || (pwd = getpwuid((uid_t) atoi(p))) == NULL)
errx(EX_NOUSER, "user `%s' does not exist", p);
}
/*
* Check for duplicates
*/
for (j = 0; j < i && strcmp(members[j], pwd->pw_name)!=0; j++)
;
if (j == i && extendarray(&members, &grmembers, i + 2) != -1)
members[i++] = newstr(pwd->pw_name);
}
while (i < grmembers)
members[i++] = NULL;
grp->gr_mem = members;
}
if (getarg(args, 'N') != NULL)
return print_group(grp, getarg(args, 'P') != NULL);
if (mode == M_ADD && (rc = addgrent(grp)) != 0) {
if (rc == -1)
warnx("group '%s' already exists", grp->gr_name);
else
warn("group update");
return EX_IOERR;
} else if (mode == M_UPDATE && (rc = chggrent(a_name->val, grp)) != 0) {
if (rc == -1)
warnx("group '%s' not available (NIS?)", grp->gr_name);
else
warn("group update");
return EX_IOERR;
}
/* grp may have been invalidated */
if ((grp = GETGRNAM(a_name->val)) == NULL)
errx(EX_SOFTWARE, "group disappeared during update");
pw_log(cnf, mode, W_GROUP, "%s(%ld)", grp->gr_name, (long) grp->gr_gid);
if (members)
free(members);
return EXIT_SUCCESS;
}
static gid_t
gr_gidpolicy(struct userconf * cnf, struct cargs * args)
{
struct group *grp;
gid_t gid = (gid_t) - 1;
struct carg *a_gid = getarg(args, 'g');
/*
* Check the given gid, if any
*/
if (a_gid != NULL) {
gid = (gid_t) atol(a_gid->val);
if ((grp = GETGRGID(gid)) != NULL && getarg(args, 'o') == NULL)
errx(EX_DATAERR, "gid `%ld' has already been allocated", (long) grp->gr_gid);
} else {
struct bitmap bm;
/*
* We need to allocate the next available gid under one of
* two policies a) Grab the first unused gid b) Grab the
* highest possible unused gid
*/
if (cnf->min_gid >= cnf->max_gid) { /* Sanity claus^H^H^H^Hheck */
cnf->min_gid = 1000;
cnf->max_gid = 32000;
}
bm = bm_alloc(cnf->max_gid - cnf->min_gid + 1);
/*
* Now, let's fill the bitmap from the password file
*/
SETGRENT();
while ((grp = GETGRENT()) != NULL)
if ((gid_t)grp->gr_gid >= (gid_t)cnf->min_gid &&
(gid_t)grp->gr_gid <= (gid_t)cnf->max_gid)
bm_setbit(&bm, grp->gr_gid - cnf->min_gid);
ENDGRENT();
/*
* Then apply the policy, with fallback to reuse if necessary
*/
if (cnf->reuse_gids)
gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
else {
gid = (gid_t) (bm_lastset(&bm) + 1);
if (!bm_isset(&bm, gid))
gid += cnf->min_gid;
else
gid = (gid_t) (bm_firstunset(&bm) + cnf->min_gid);
}
/*
* Another sanity check
*/
if (gid < cnf->min_gid || gid > cnf->max_gid)
errx(EX_SOFTWARE, "unable to allocate a new gid - range fully used");
bm_dealloc(&bm);
}
return gid;
}
static int
print_group(struct group * grp, int pretty)
{
if (!pretty) {
int buflen = 0;
char *buf = NULL;
fmtgrent(&buf, &buflen, grp);
fputs(buf, stdout);
free(buf);
} else {
int i;
printf("Group Name: %-15s #%lu\n"
" Members: ",
grp->gr_name, (long) grp->gr_gid);
for (i = 0; grp->gr_mem[i]; i++)
printf("%s%s", i ? "," : "", grp->gr_mem[i]);
fputs("\n\n", stdout);
}
return EXIT_SUCCESS;
}