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freebsd/usr.sbin/pw/pw_group.c

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/*-
* 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[] =
"$FreeBSD$";
#endif /* not lint */
#include <ctype.h>
#include <err.h>
#include <grp.h>
#include <libutil.h>
#include <paths.h>
#include <string.h>
#include <sysexits.h>
#include <termios.h>
#include <unistd.h>
#include "pw.h"
#include "bitmap.h"
static struct passwd *lookup_pwent(const char *user);
static void delete_members(struct group *grp, char *list);
static int print_group(struct group * grp, bool pretty);
static gid_t gr_gidpolicy(struct userconf * cnf, intmax_t id);
static void
grp_set_passwd(struct group *grp, bool update, int fd, bool precrypted)
{
int b;
int istty;
struct termios t, n;
char *p, line[256];
if (fd == -1)
return;
if (fd == '-') {
grp->gr_passwd = "*"; /* No access */
return;
}
if ((istty = isatty(fd))) {
n = t;
/* Disable echo */
n.c_lflag &= ~(ECHO);
tcsetattr(fd, TCSANOW, &n);
printf("%sassword for group %s:", 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)
err(EX_OSERR, "-h file descriptor");
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",
conf.fd);
if (precrypted) {
if (strchr(line, ':') != 0)
errx(EX_DATAERR, "wrong encrypted passwrd");
grp->gr_passwd = line;
} else
grp->gr_passwd = pw_pwcrypt(line);
}
int
pw_groupnext(struct userconf *cnf, bool quiet)
{
gid_t next = gr_gidpolicy(cnf, -1);
if (quiet)
return (next);
printf("%ju\n", (uintmax_t)next);
return (EXIT_SUCCESS);
}
static struct group *
getgroup(char *name, intmax_t id, bool fatal)
{
struct group *grp;
if (id < 0 && name == NULL)
errx(EX_DATAERR, "groupname or id required");
grp = (name != NULL) ? GETGRNAM(name) : GETGRGID(id);
if (grp == NULL) {
if (!fatal)
return (NULL);
if (name == NULL)
errx(EX_DATAERR, "unknown gid `%ju'", id);
errx(EX_DATAERR, "unknown group `%s'", name);
}
return (grp);
}
/*
* Lookup a passwd entry using a name or UID.
*/
static struct passwd *
lookup_pwent(const char *user)
{
struct passwd *pwd;
if ((pwd = GETPWNAM(user)) == NULL &&
(!isdigit((unsigned char)*user) ||
(pwd = getpwuid((uid_t) atoi(user))) == NULL))
errx(EX_NOUSER, "user `%s' does not exist", user);
return (pwd);
}
/*
* Delete requested members from a group.
*/
static void
delete_members(struct group *grp, char *list)
{
char *p;
int k;
if (grp->gr_mem == NULL)
return;
for (p = strtok(list, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
for (k = 0; grp->gr_mem[k] != NULL; k++) {
if (strcmp(grp->gr_mem[k], p) == 0)
break;
}
if (grp->gr_mem[k] == NULL) /* No match */
continue;
for (; grp->gr_mem[k] != NULL; k++)
grp->gr_mem[k] = grp->gr_mem[k+1];
}
}
static gid_t
gr_gidpolicy(struct userconf * cnf, intmax_t id)
{
struct group *grp;
struct bitmap bm;
gid_t gid = (gid_t) - 1;
/*
* Check the given gid, if any
*/
if (id > 0) {
gid = (gid_t) id;
if ((grp = GETGRGID(gid)) != NULL && conf.checkduplicate)
errx(EX_DATAERR, "gid `%ju' has already been allocated",
(uintmax_t)grp->gr_gid);
return (gid);
}
/*
* 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, bool pretty)
{
char *buf = NULL;
int i;
if (pretty) {
printf("Group Name: %-15s #%lu\n"
" Members: ",
grp->gr_name, (long) grp->gr_gid);
if (grp->gr_mem != NULL) {
for (i = 0; grp->gr_mem[i]; i++)
printf("%s%s", i ? "," : "", grp->gr_mem[i]);
}
fputs("\n\n", stdout);
return (EXIT_SUCCESS);
}
buf = gr_make(grp);
printf("%s\n", buf);
free(buf);
return (EXIT_SUCCESS);
}
int
pw_group_next(int argc, char **argv, char *arg1 __unused)
{
struct userconf *cnf;
const char *cfg = NULL;
int ch;
bool quiet;
while ((ch = getopt(argc, argv, "Cq")) != -1) {
switch (ch) {
case 'C':
cfg = optarg;
break;
case 'q':
quiet = true;
break;
}
}
if (quiet)
freopen(_PATH_DEVNULL, "w", stderr);
cnf = get_userconfig(cfg);
return (pw_groupnext(cnf, quiet));
}
int
pw_group_show(int argc, char **argv, char *arg1)
{
struct group *grp = NULL;
char *name;
intmax_t id = -1;
int ch;
bool all, force, quiet, pretty;
all = force = quiet = pretty = false;
struct group fakegroup = {
"nogroup",
"*",
-1,
NULL
};
if (arg1 != NULL) {
if (arg1[strspn(arg1, "0123456789")] == '\0')
id = pw_checkid(arg1, GID_MAX);
else
name = arg1;
}
while ((ch = getopt(argc, argv, "C:qn:g:FPa")) != -1) {
switch (ch) {
case 'C':
/* ignore compatibility */
break;
case 'q':
quiet = true;
break;
case 'n':
name = optarg;
break;
case 'g':
id = pw_checkid(optarg, GID_MAX);
break;
case 'F':
force = true;
break;
case 'P':
pretty = true;
break;
case 'a':
all = true;
break;
}
}
if (quiet)
freopen(_PATH_DEVNULL, "w", stderr);
if (all) {
SETGRENT();
while ((grp = GETGRENT()) != NULL)
print_group(grp, pretty);
ENDGRENT();
return (EXIT_SUCCESS);
}
grp = getgroup(name, id, !force);
if (grp == NULL)
grp = &fakegroup;
return (print_group(grp, pretty));
}
int
pw_group_del(int argc, char **argv, char *arg1)
{
struct userconf *cnf = NULL;
struct group *grp = NULL;
char *name;
const char *cfg = NULL;
intmax_t id = -1;
int ch, rc;
bool quiet = false;
bool nis = false;
if (arg1 != NULL) {
if (arg1[strspn(arg1, "0123456789")] == '\0')
id = pw_checkid(arg1, GID_MAX);
else
name = arg1;
}
while ((ch = getopt(argc, argv, "C:qn:g:Y")) != -1) {
switch (ch) {
case 'C':
cfg = optarg;
break;
case 'q':
quiet = true;
break;
case 'n':
name = optarg;
break;
case 'g':
id = pw_checkid(optarg, GID_MAX);
break;
case 'Y':
nis = true;
break;
}
}
if (quiet)
freopen(_PATH_DEVNULL, "w", stderr);
grp = getgroup(name, id, true);
cnf = get_userconfig(cfg);
rc = delgrent(grp);
if (rc == -1)
err(EX_IOERR, "group '%s' not available (NIS?)", name);
else if (rc != 0)
err(EX_IOERR, "group update");
pw_log(cnf, M_DELETE, W_GROUP, "%s(%ju) removed", name,
(uintmax_t)id);
if (nis && nis_update() == 0)
pw_log(cnf, M_DELETE, W_GROUP, "NIS maps updated");
return (EXIT_SUCCESS);
}
static bool
grp_has_member(struct group *grp, const char *name)
{
int j;
for (j = 0; grp->gr_mem != NULL && grp->gr_mem[j] != NULL; j++)
if (strcmp(grp->gr_mem[j], name) == 0)
return (true);
return (false);
}
static void
grp_add_members(struct group **grp, char *members)
{
struct passwd *pwd;
char *p;
char tok[] = ", \t";
if (members == NULL)
return;
for (p = strtok(members, tok); p != NULL; p = strtok(NULL, tok)) {
pwd = lookup_pwent(p);
if (grp_has_member(*grp, pwd->pw_name))
continue;
*grp = gr_add(*grp, pwd->pw_name);
}
}
int
groupadd(struct userconf *cnf, char *name, gid_t id, char *members, int fd,
bool dryrun, bool pretty, bool precrypted)
{
struct group *grp;
int rc;
struct group fakegroup = {
"nogroup",
"*",
-1,
NULL
};
grp = &fakegroup;
grp->gr_name = pw_checkname(name, 0);
grp->gr_passwd = "*";
grp->gr_gid = gr_gidpolicy(cnf, id);
grp->gr_mem = NULL;
/*
* 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.
*/
grp_set_passwd(grp, false, fd, precrypted);
grp_add_members(&grp, members);
if (dryrun)
return (print_group(grp, pretty));
if ((rc = addgrent(grp)) != 0) {
if (rc == -1)
errx(EX_IOERR, "group '%s' already exists",
grp->gr_name);
else
err(EX_IOERR, "group update");
}
pw_log(cnf, M_ADD, W_GROUP, "%s(%ju)", grp->gr_name,
(uintmax_t)grp->gr_gid);
return (EXIT_SUCCESS);
}
int
pw_group_add(int argc, char **argv, char *arg1)
{
struct userconf *cnf = NULL;
char *name = NULL;
char *members = NULL;
const char *cfg = NULL;
intmax_t id = -1;
int ch, rc, fd = -1;
bool quiet, precrypted, dryrun, pretty, nis;
quiet = precrypted = dryrun = pretty = nis = false;
if (arg1 != NULL) {
if (arg1[strspn(arg1, "0123456789")] == '\0')
id = pw_checkid(arg1, GID_MAX);
else
name = arg1;
}
while ((ch = getopt(argc, argv, "C:qn:g:h:H:M:oNPY")) != -1) {
switch (ch) {
case 'C':
cfg = optarg;
break;
case 'q':
quiet = true;
break;
case 'n':
name = optarg;
break;
case 'g':
id = pw_checkid(optarg, GID_MAX);
break;
case 'H':
if (fd != -1)
errx(EX_USAGE, "'-h' and '-H' are mutually "
"exclusive options");
fd = pw_checkfd(optarg);
precrypted = true;
if (fd == '-')
errx(EX_USAGE, "-H expects a file descriptor");
break;
case 'h':
if (fd != -1)
errx(EX_USAGE, "'-h' and '-H' are mutually "
"exclusive options");
fd = pw_checkfd(optarg);
break;
case 'M':
members = optarg;
break;
case 'o':
conf.checkduplicate = false;
break;
case 'N':
dryrun = true;
break;
case 'P':
pretty = true;
break;
case 'Y':
nis = true;
break;
}
}
if (quiet)
freopen(_PATH_DEVNULL, "w", stderr);
if (name == NULL)
errx(EX_DATAERR, "group name required");
if (GETGRNAM(name) != NULL)
errx(EX_DATAERR, "group name `%s' already exists", name);
cnf = get_userconfig(cfg);
rc = groupadd(cnf, name, gr_gidpolicy(cnf, id), members, fd, dryrun,
pretty, precrypted);
if (nis && rc == EXIT_SUCCESS && nis_update() == 0)
pw_log(cnf, M_ADD, W_GROUP, "NIS maps updated");
return (rc);
}
int
pw_group_mod(int argc, char **argv, char *arg1)
{
struct userconf *cnf;
struct group *grp = NULL;
const char *cfg = NULL;
char *oldmembers = NULL;
char *members = NULL;
char *newmembers = NULL;
char *newname = NULL;
char *name = NULL;
intmax_t id = -1;
int ch, rc, fd = -1;
bool quiet, pretty, dryrun, nis, precrypted;
quiet = pretty = dryrun = nis = precrypted = false;
if (arg1 != NULL) {
if (arg1[strspn(arg1, "0123456789")] == '\0')
id = pw_checkid(arg1, GID_MAX);
else
name = arg1;
}
while ((ch = getopt(argc, argv, "C:qn:d:g:l:h:H:M:m:NPY")) != -1) {
switch (ch) {
case 'C':
cfg = optarg;
break;
case 'q':
quiet = true;
break;
case 'n':
name = optarg;
break;
case 'g':
id = pw_checkid(optarg, GID_MAX);
break;
case 'd':
oldmembers = optarg;
break;
case 'l':
newname = optarg;
break;
case 'H':
if (fd != -1)
errx(EX_USAGE, "'-h' and '-H' are mutually "
"exclusive options");
fd = pw_checkfd(optarg);
precrypted = true;
if (fd == '-')
errx(EX_USAGE, "-H expects a file descriptor");
break;
case 'h':
if (fd != -1)
errx(EX_USAGE, "'-h' and '-H' are mutually "
"exclusive options");
fd = pw_checkfd(optarg);
break;
case 'M':
members = optarg;
break;
case 'm':
newmembers = optarg;
break;
case 'N':
dryrun = true;
break;
case 'P':
pretty = true;
break;
case 'Y':
nis = true;
break;
}
}
if (quiet)
freopen(_PATH_DEVNULL, "w", stderr);
cnf = get_userconfig(cfg);
grp = getgroup(name, id, true);
if (name == NULL)
name = grp->gr_name;
if (id > 0)
grp->gr_gid = id;
if (newname != NULL)
grp->gr_name = pw_checkname(newname, 0);
grp_set_passwd(grp, true, fd, precrypted);
/*
* Keep the same logic as old code for now:
* if -M is passed, -d and -m are ignored
* then id -d, -m is ignored
* last is -m
*/
if (members) {
grp->gr_mem = NULL;
grp_add_members(&grp, members);
} else if (oldmembers) {
delete_members(grp, oldmembers);
} else if (newmembers) {
grp_add_members(&grp, newmembers);
}
if ((rc = chggrent(name, grp)) != 0) {
if (rc == -1)
errx(EX_IOERR, "group '%s' not available (NIS?)",
grp->gr_name);
else
err(EX_IOERR, "group update");
}
if (newname)
name = newname;
/* grp may have been invalidated */
if ((grp = GETGRNAM(name)) == NULL)
errx(EX_SOFTWARE, "group disappeared during update");
pw_log(cnf, M_UPDATE, W_GROUP, "%s(%ju)", grp->gr_name,
(uintmax_t)grp->gr_gid);
if (nis && nis_update() == 0)
pw_log(cnf, M_UPDATE, W_GROUP, "NIS maps updated");
return (EXIT_SUCCESS);
}
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