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freebsd-nq/usr.sbin/pw/pw_user.c
Eitan Adler 6c3c59886c Avoid overflow of file buffer 
Submitted by:	db
Approved by:	cperciva
MFC after:	2 weeks
2012-12-05 13:56:46 +00:00

1321 lines
36 KiB
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 <fcntl.h>
#include <sys/param.h>
#include <dirent.h>
#include <paths.h>
#include <termios.h>
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <unistd.h>
#include <login_cap.h>
#include <pwd.h>
#include <grp.h>
#include <libutil.h>
#include "pw.h"
#include "bitmap.h"
#define LOGNAMESIZE (MAXLOGNAME-1)
static char locked_str[] = "*LOCKED*";
static int print_user(struct passwd * pwd, int pretty, int v7);
static uid_t pw_uidpolicy(struct userconf * cnf, struct cargs * args);
static uid_t pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer);
static time_t pw_pwdpolicy(struct userconf * cnf, struct cargs * args);
static time_t pw_exppolicy(struct userconf * cnf, struct cargs * args);
static char *pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user);
static char *pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell);
static char *pw_password(struct userconf * cnf, struct cargs * args, char const * user);
static char *shell_path(char const * path, char *shells[], char *sh);
static void rmat(uid_t uid);
static void rmopie(char const * name);
/*-
* -C config configuration file
* -q quiet operation
* -n name login name
* -u uid user id
* -c comment user name/comment
* -d directory home directory
* -e date account expiry date
* -p date password expiry date
* -g grp primary group
* -G grp1,grp2 additional groups
* -m [ -k dir ] create and set up home
* -s shell name of login shell
* -o duplicate uid ok
* -L class user class
* -l name new login name
* -h fd password filehandle
* -H fd encrypted password filehandle
* -F force print or add
* Setting defaults:
* -D set user defaults
* -b dir default home root dir
* -e period default expiry period
* -p period default password change period
* -g group default group
* -G grp1,grp2.. default additional groups
* -L class default login class
* -k dir default home skeleton
* -s shell default shell
* -w method default password method
*/
int
pw_user(struct userconf * cnf, int mode, struct cargs * args)
{
int rc, edited = 0;
char *p = NULL;
char *passtmp;
struct carg *a_name;
struct carg *a_uid;
struct carg *arg;
struct passwd *pwd = NULL;
struct group *grp;
struct stat st;
char line[_PASSWORD_LEN+1];
FILE *fp;
char *dmode_c;
void *set = NULL;
static struct passwd fakeuser =
{
NULL,
"*",
-1,
-1,
0,
"",
"User &",
"/nonexistent",
"/bin/sh",
0
#if defined(__FreeBSD__)
,0
#endif
};
/*
* With M_NEXT, we only need to return the
* next uid to stdout
*/
if (mode == M_NEXT)
{
uid_t next = pw_uidpolicy(cnf, args);
if (getarg(args, 'q'))
return next;
printf("%ld:", (long)next);
pw_group(cnf, mode, args);
return EXIT_SUCCESS;
}
/*
* We can do all of the common legwork here
*/
if ((arg = getarg(args, 'b')) != NULL) {
cnf->home = arg->val;
}
if ((arg = getarg(args, 'M')) != NULL) {
dmode_c = arg->val;
if ((set = setmode(dmode_c)) == NULL)
errx(EX_DATAERR, "invalid directory creation mode '%s'",
dmode_c);
cnf->homemode = getmode(set, _DEF_DIRMODE);
free(set);
}
/*
* If we'll need to use it or we're updating it,
* then create the base home directory if necessary
*/
if (arg != NULL || getarg(args, 'm') != NULL) {
int l = strlen(cnf->home);
if (l > 1 && cnf->home[l-1] == '/') /* Shave off any trailing path delimiter */
cnf->home[--l] = '\0';
if (l < 2 || *cnf->home != '/') /* Check for absolute path name */
errx(EX_DATAERR, "invalid base directory for home '%s'", cnf->home);
if (stat(cnf->home, &st) == -1) {
char dbuf[MAXPATHLEN];
/*
* This is a kludge especially for Joerg :)
* If the home directory would be created in the root partition, then
* we really create it under /usr which is likely to have more space.
* But we create a symlink from cnf->home -> "/usr" -> cnf->home
*/
if (strchr(cnf->home+1, '/') == NULL) {
strcpy(dbuf, "/usr");
strncat(dbuf, cnf->home, MAXPATHLEN-5);
if (mkdir(dbuf, _DEF_DIRMODE) != -1 || errno == EEXIST) {
chown(dbuf, 0, 0);
/*
* Skip first "/" and create symlink:
* /home -> usr/home
*/
symlink(dbuf+1, cnf->home);
}
/* If this falls, fall back to old method */
}
strlcpy(dbuf, cnf->home, sizeof(dbuf));
p = dbuf;
if (stat(dbuf, &st) == -1) {
while ((p = strchr(++p, '/')) != NULL) {
*p = '\0';
if (stat(dbuf, &st) == -1) {
if (mkdir(dbuf, _DEF_DIRMODE) == -1)
goto direrr;
chown(dbuf, 0, 0);
} else if (!S_ISDIR(st.st_mode))
errx(EX_OSFILE, "'%s' (root home parent) is not a directory", dbuf);
*p = '/';
}
}
if (stat(dbuf, &st) == -1) {
if (mkdir(dbuf, _DEF_DIRMODE) == -1) {
direrr: err(EX_OSFILE, "mkdir '%s'", dbuf);
}
chown(dbuf, 0, 0);
}
} else if (!S_ISDIR(st.st_mode))
errx(EX_OSFILE, "root home `%s' is not a directory", cnf->home);
}
if ((arg = getarg(args, 'e')) != NULL)
cnf->expire_days = atoi(arg->val);
if ((arg = getarg(args, 'y')) != NULL)
cnf->nispasswd = arg->val;
if ((arg = getarg(args, 'p')) != NULL && arg->val)
cnf->password_days = atoi(arg->val);
if ((arg = getarg(args, 'g')) != NULL) {
if (!*(p = arg->val)) /* Handle empty group list specially */
cnf->default_group = "";
else {
if ((grp = GETGRNAM(p)) == NULL) {
if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
errx(EX_NOUSER, "group `%s' does not exist", p);
}
cnf->default_group = newstr(grp->gr_name);
}
}
if ((arg = getarg(args, 'L')) != NULL)
cnf->default_class = pw_checkname((u_char *)arg->val, 0);
if ((arg = getarg(args, 'G')) != NULL && arg->val) {
int i = 0;
for (p = strtok(arg->val, ", \t"); p != NULL; p = strtok(NULL, ", \t")) {
if ((grp = GETGRNAM(p)) == NULL) {
if (!isdigit((unsigned char)*p) || (grp = GETGRGID((gid_t) atoi(p))) == NULL)
errx(EX_NOUSER, "group `%s' does not exist", p);
}
if (extendarray(&cnf->groups, &cnf->numgroups, i + 2) != -1)
cnf->groups[i++] = newstr(grp->gr_name);
}
while (i < cnf->numgroups)
cnf->groups[i++] = NULL;
}
if ((arg = getarg(args, 'k')) != NULL) {
if (stat(cnf->dotdir = arg->val, &st) == -1 || !S_ISDIR(st.st_mode))
errx(EX_OSFILE, "skeleton `%s' is not a directory or does not exist", cnf->dotdir);
}
if ((arg = getarg(args, 's')) != NULL)
cnf->shell_default = arg->val;
if ((arg = getarg(args, 'w')) != NULL)
cnf->default_password = boolean_val(arg->val, cnf->default_password);
if (mode == M_ADD && getarg(args, 'D')) {
if (getarg(args, 'n') != NULL)
errx(EX_DATAERR, "can't combine `-D' with `-n name'");
if ((arg = getarg(args, 'u')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
if ((cnf->min_uid = (uid_t) atoi(p)) == 0)
cnf->min_uid = 1000;
if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_uid = (uid_t) atoi(p)) < cnf->min_uid)
cnf->max_uid = 32000;
}
if ((arg = getarg(args, 'i')) != NULL && (p = strtok(arg->val, ", \t")) != NULL) {
if ((cnf->min_gid = (gid_t) atoi(p)) == 0)
cnf->min_gid = 1000;
if ((p = strtok(NULL, " ,\t")) == NULL || (cnf->max_gid = (gid_t) atoi(p)) < cnf->min_gid)
cnf->max_gid = 32000;
}
arg = getarg(args, 'C');
if (write_userconfig(arg ? arg->val : NULL))
return EXIT_SUCCESS;
warn("config update");
return EX_IOERR;
}
if (mode == M_PRINT && getarg(args, 'a')) {
int pretty = getarg(args, 'P') != NULL;
int v7 = getarg(args, '7') != NULL;
SETPWENT();
while ((pwd = GETPWENT()) != NULL)
print_user(pwd, pretty, v7);
ENDPWENT();
return EXIT_SUCCESS;
}
if ((a_name = getarg(args, 'n')) != NULL)
pwd = GETPWNAM(pw_checkname((u_char *)a_name->val, 0));
a_uid = getarg(args, 'u');
if (a_uid == NULL) {
if (a_name == NULL)
errx(EX_DATAERR, "user name or id required");
/*
* Determine whether 'n' switch is name or uid - we don't
* really don't really care which we have, but we need to
* know.
*/
if (mode != M_ADD && pwd == NULL
&& strspn(a_name->val, "0123456789") == strlen(a_name->val)
&& *a_name->val) {
(a_uid = a_name)->ch = 'u';
a_name = NULL;
}
}
/*
* Update, delete & print require that the user exists
*/
if (mode == M_UPDATE || mode == M_DELETE ||
mode == M_PRINT || mode == M_LOCK || mode == M_UNLOCK) {
if (a_name == NULL && pwd == NULL) /* Try harder */
pwd = GETPWUID(atoi(a_uid->val));
if (pwd == NULL) {
if (mode == M_PRINT && getarg(args, 'F')) {
fakeuser.pw_name = a_name ? a_name->val : "nouser";
fakeuser.pw_uid = a_uid ? (uid_t) atol(a_uid->val) : -1;
return print_user(&fakeuser,
getarg(args, 'P') != NULL,
getarg(args, '7') != NULL);
}
if (a_name == NULL)
errx(EX_NOUSER, "no such uid `%s'", a_uid->val);
errx(EX_NOUSER, "no such user `%s'", a_name->val);
}
if (a_name == NULL) /* May be needed later */
a_name = addarg(args, 'n', newstr(pwd->pw_name));
/*
* The M_LOCK and M_UNLOCK functions simply add or remove
* a "*LOCKED*" prefix from in front of the password to
* prevent it decoding correctly, and therefore prevents
* access. Of course, this only prevents access via
* password authentication (not ssh, kerberos or any
* other method that does not use the UNIX password) but
* that is a known limitation.
*/
if (mode == M_LOCK) {
if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) == 0)
errx(EX_DATAERR, "user '%s' is already locked", pwd->pw_name);
passtmp = malloc(strlen(pwd->pw_passwd) + sizeof(locked_str));
if (passtmp == NULL) /* disaster */
errx(EX_UNAVAILABLE, "out of memory");
strcpy(passtmp, locked_str);
strcat(passtmp, pwd->pw_passwd);
pwd->pw_passwd = passtmp;
edited = 1;
} else if (mode == M_UNLOCK) {
if (strncmp(pwd->pw_passwd, locked_str, sizeof(locked_str)-1) != 0)
errx(EX_DATAERR, "user '%s' is not locked", pwd->pw_name);
pwd->pw_passwd += sizeof(locked_str)-1;
edited = 1;
} else if (mode == M_DELETE) {
/*
* Handle deletions now
*/
char file[MAXPATHLEN];
char home[MAXPATHLEN];
uid_t uid = pwd->pw_uid;
if (strcmp(pwd->pw_name, "root") == 0)
errx(EX_DATAERR, "cannot remove user 'root'");
if (!PWALTDIR()) {
/*
* Remove opie record from /etc/opiekeys
*/
rmopie(pwd->pw_name);
/*
* Remove crontabs
*/
snprintf(file, sizeof(file), "/var/cron/tabs/%s", pwd->pw_name);
if (access(file, F_OK) == 0) {
sprintf(file, "crontab -u %s -r", pwd->pw_name);
system(file);
}
}
/*
* Save these for later, since contents of pwd may be
* invalidated by deletion
*/
sprintf(file, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
strlcpy(home, pwd->pw_dir, sizeof(home));
rc = delpwent(pwd);
if (rc == -1)
err(EX_IOERR, "user '%s' does not exist", pwd->pw_name);
else if (rc != 0) {
warn("passwd update");
return EX_IOERR;
}
if (cnf->nispasswd && *cnf->nispasswd=='/') {
rc = delnispwent(cnf->nispasswd, a_name->val);
if (rc == -1)
warnx("WARNING: user '%s' does not exist in NIS passwd", pwd->pw_name);
else if (rc != 0)
warn("WARNING: NIS passwd update");
/* non-fatal */
}
grp = GETGRNAM(a_name->val);
if (*grp->gr_mem == NULL)
delgrent(GETGRNAM(a_name->val));
SETGRENT();
while ((grp = GETGRENT()) != NULL) {
int i;
char group[MAXLOGNAME];
for (i = 0; grp->gr_mem[i] != NULL; i++) {
if (!strcmp(grp->gr_mem[i], a_name->val)) {
while (grp->gr_mem[i] != NULL) {
grp->gr_mem[i] = grp->gr_mem[i+1];
}
strlcpy(group, grp->gr_name, MAXLOGNAME);
chggrent(group, grp);
}
}
}
ENDGRENT();
pw_log(cnf, mode, W_USER, "%s(%ld) account removed", a_name->val, (long) uid);
if (!PWALTDIR()) {
/*
* Remove mail file
*/
remove(file);
/*
* Remove at jobs
*/
if (getpwuid(uid) == NULL)
rmat(uid);
/*
* Remove home directory and contents
*/
if (getarg(args, 'r') != NULL && *home == '/' && getpwuid(uid) == NULL) {
if (stat(home, &st) != -1) {
rm_r(home, uid);
pw_log(cnf, mode, W_USER, "%s(%ld) home '%s' %sremoved",
a_name->val, (long) uid, home,
stat(home, &st) == -1 ? "" : "not completely ");
}
}
}
return EXIT_SUCCESS;
} else if (mode == M_PRINT)
return print_user(pwd,
getarg(args, 'P') != NULL,
getarg(args, '7') != NULL);
/*
* The rest is edit code
*/
if ((arg = getarg(args, 'l')) != NULL) {
if (strcmp(pwd->pw_name, "root") == 0)
errx(EX_DATAERR, "can't rename `root' account");
pwd->pw_name = pw_checkname((u_char *)arg->val, 0);
edited = 1;
}
if ((arg = getarg(args, 'u')) != NULL && isdigit((unsigned char)*arg->val)) {
pwd->pw_uid = (uid_t) atol(arg->val);
edited = 1;
if (pwd->pw_uid != 0 && strcmp(pwd->pw_name, "root") == 0)
errx(EX_DATAERR, "can't change uid of `root' account");
if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
warnx("WARNING: account `%s' will have a uid of 0 (superuser access!)", pwd->pw_name);
}
if ((arg = getarg(args, 'g')) != NULL && pwd->pw_uid != 0) { /* Already checked this */
gid_t newgid = (gid_t) GETGRNAM(cnf->default_group)->gr_gid;
if (newgid != pwd->pw_gid) {
edited = 1;
pwd->pw_gid = newgid;
}
}
if ((arg = getarg(args, 'p')) != NULL) {
if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
if (pwd->pw_change != 0) {
pwd->pw_change = 0;
edited = 1;
}
}
else {
time_t now = time(NULL);
time_t expire = parse_date(now, arg->val);
if (now == expire)
errx(EX_DATAERR, "invalid password change date `%s'", arg->val);
if (pwd->pw_change != expire) {
pwd->pw_change = expire;
edited = 1;
}
}
}
if ((arg = getarg(args, 'e')) != NULL) {
if (*arg->val == '\0' || strcmp(arg->val, "0") == 0) {
if (pwd->pw_expire != 0) {
pwd->pw_expire = 0;
edited = 1;
}
}
else {
time_t now = time(NULL);
time_t expire = parse_date(now, arg->val);
if (now == expire)
errx(EX_DATAERR, "invalid account expiry date `%s'", arg->val);
if (pwd->pw_expire != expire) {
pwd->pw_expire = expire;
edited = 1;
}
}
}
if ((arg = getarg(args, 's')) != NULL) {
char *shell = shell_path(cnf->shelldir, cnf->shells, arg->val);
if (shell == NULL)
shell = "";
if (strcmp(shell, pwd->pw_shell) != 0) {
pwd->pw_shell = shell;
edited = 1;
}
}
if (getarg(args, 'L')) {
if (cnf->default_class == NULL)
cnf->default_class = "";
if (strcmp(pwd->pw_class, cnf->default_class) != 0) {
pwd->pw_class = cnf->default_class;
edited = 1;
}
}
if ((arg = getarg(args, 'd')) != NULL) {
if (strcmp(pwd->pw_dir, arg->val))
edited = 1;
if (stat(pwd->pw_dir = arg->val, &st) == -1) {
if (getarg(args, 'm') == NULL && strcmp(pwd->pw_dir, "/nonexistent") != 0)
warnx("WARNING: home `%s' does not exist", pwd->pw_dir);
} else if (!S_ISDIR(st.st_mode))
warnx("WARNING: home `%s' is not a directory", pwd->pw_dir);
}
if ((arg = getarg(args, 'w')) != NULL &&
getarg(args, 'h') == NULL && getarg(args, 'H') == NULL) {
login_cap_t *lc;
lc = login_getpwclass(pwd);
if (lc == NULL ||
login_setcryptfmt(lc, "md5", NULL) == NULL)
warn("setting crypt(3) format");
login_close(lc);
pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
edited = 1;
}
} else {
login_cap_t *lc;
/*
* Add code
*/
if (a_name == NULL) /* Required */
errx(EX_DATAERR, "login name required");
else if ((pwd = GETPWNAM(a_name->val)) != NULL) /* Exists */
errx(EX_DATAERR, "login name `%s' already exists", a_name->val);
/*
* Now, set up defaults for a new user
*/
pwd = &fakeuser;
pwd->pw_name = a_name->val;
pwd->pw_class = cnf->default_class ? cnf->default_class : "";
pwd->pw_uid = pw_uidpolicy(cnf, args);
pwd->pw_gid = pw_gidpolicy(cnf, args, pwd->pw_name, (gid_t) pwd->pw_uid);
pwd->pw_change = pw_pwdpolicy(cnf, args);
pwd->pw_expire = pw_exppolicy(cnf, args);
pwd->pw_dir = pw_homepolicy(cnf, args, pwd->pw_name);
pwd->pw_shell = pw_shellpolicy(cnf, args, NULL);
lc = login_getpwclass(pwd);
if (lc == NULL || login_setcryptfmt(lc, "md5", NULL) == NULL)
warn("setting crypt(3) format");
login_close(lc);
pwd->pw_passwd = pw_password(cnf, args, pwd->pw_name);
edited = 1;
if (pwd->pw_uid == 0 && strcmp(pwd->pw_name, "root") != 0)
warnx("WARNING: new account `%s' has a uid of 0 (superuser access!)", pwd->pw_name);
}
/*
* Shared add/edit code
*/
if ((arg = getarg(args, 'c')) != NULL) {
char *gecos = pw_checkname((u_char *)arg->val, 1);
if (strcmp(pwd->pw_gecos, gecos) != 0) {
pwd->pw_gecos = gecos;
edited = 1;
}
}
if ((arg = getarg(args, 'h')) != NULL ||
(arg = getarg(args, 'H')) != NULL) {
if (strcmp(arg->val, "-") == 0) {
if (!pwd->pw_passwd || *pwd->pw_passwd != '*') {
pwd->pw_passwd = "*"; /* No access */
edited = 1;
}
} else {
int fd = atoi(arg->val);
int precrypt = (arg->ch == 'H');
int b;
int istty = isatty(fd);
struct termios t;
login_cap_t *lc;
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("%s%spassword for user %s:",
(mode == M_UPDATE) ? "new " : "",
precrypt ? "encrypted " : "",
pwd->pw_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("-%c file descriptor", precrypt ? 'H' :
'h');
return EX_IOERR;
}
line[b] = '\0';
if ((p = strpbrk(line, "\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;
pwd->pw_passwd = line;
} else {
lc = login_getpwclass(pwd);
if (lc == NULL ||
login_setcryptfmt(lc, "md5", NULL) == NULL)
warn("setting crypt(3) format");
login_close(lc);
pwd->pw_passwd = pw_pwcrypt(line);
}
edited = 1;
}
}
/*
* Special case: -N only displays & exits
*/
if (getarg(args, 'N') != NULL)
return print_user(pwd,
getarg(args, 'P') != NULL,
getarg(args, '7') != NULL);
if (mode == M_ADD) {
edited = 1; /* Always */
rc = addpwent(pwd);
if (rc == -1) {
warnx("user '%s' already exists", pwd->pw_name);
return EX_IOERR;
} else if (rc != 0) {
warn("passwd file update");
return EX_IOERR;
}
if (cnf->nispasswd && *cnf->nispasswd=='/') {
rc = addnispwent(cnf->nispasswd, pwd);
if (rc == -1)
warnx("User '%s' already exists in NIS passwd", pwd->pw_name);
else
warn("NIS passwd update");
/* NOTE: we treat NIS-only update errors as non-fatal */
}
} else if (mode == M_UPDATE || mode == M_LOCK || mode == M_UNLOCK) {
if (edited) { /* Only updated this if required */
rc = chgpwent(a_name->val, pwd);
if (rc == -1) {
warnx("user '%s' does not exist (NIS?)", pwd->pw_name);
return EX_IOERR;
} else if (rc != 0) {
warn("passwd file update");
return EX_IOERR;
}
if ( cnf->nispasswd && *cnf->nispasswd=='/') {
rc = chgnispwent(cnf->nispasswd, a_name->val, pwd);
if (rc == -1)
warn("User '%s' not found in NIS passwd", pwd->pw_name);
else
warn("NIS passwd update");
/* NOTE: NIS-only update errors are not fatal */
}
}
}
/*
* Ok, user is created or changed - now edit group file
*/
if (mode == M_ADD || getarg(args, 'G') != NULL) {
int i, j;
for (i = 0; cnf->groups[i] != NULL; i++) {
grp = GETGRNAM(cnf->groups[i]);
for (j = 0; grp->gr_mem[j] != NULL; j++) {
if (!strcmp(grp->gr_mem[j], pwd->pw_name))
break;
}
if (grp->gr_mem[j] != NULL) /* user already member of group */
continue;
if (j == 0)
grp->gr_mem = NULL;
grp->gr_mem = reallocf(grp->gr_mem, sizeof(*grp->gr_mem) *
(j + 2));
grp->gr_mem[j] = pwd->pw_name;
grp->gr_mem[j+1] = NULL;
chggrent(cnf->groups[i], grp);
}
}
/* go get a current version of pwd */
pwd = GETPWNAM(a_name->val);
if (pwd == NULL) {
/* This will fail when we rename, so special case that */
if (mode == M_UPDATE && (arg = getarg(args, 'l')) != NULL) {
a_name->val = arg->val; /* update new name */
pwd = GETPWNAM(a_name->val); /* refetch renamed rec */
}
}
if (pwd == NULL) /* can't go on without this */
errx(EX_NOUSER, "user '%s' disappeared during update", a_name->val);
grp = GETGRGID(pwd->pw_gid);
pw_log(cnf, mode, W_USER, "%s(%ld):%s(%ld):%s:%s:%s",
pwd->pw_name, (long) pwd->pw_uid,
grp ? grp->gr_name : "unknown", (long) (grp ? grp->gr_gid : -1),
pwd->pw_gecos, pwd->pw_dir, pwd->pw_shell);
/*
* If adding, let's touch and chown the user's mail file. This is not
* strictly necessary under BSD with a 0755 maildir but it also
* doesn't hurt anything to create the empty mailfile
*/
if (mode == M_ADD) {
if (!PWALTDIR()) {
sprintf(line, "%s/%s", _PATH_MAILDIR, pwd->pw_name);
close(open(line, O_RDWR | O_CREAT, 0600)); /* Preserve contents &
* mtime */
chown(line, pwd->pw_uid, pwd->pw_gid);
}
}
/*
* Let's create and populate the user's home directory. Note
* that this also `works' for editing users if -m is used, but
* existing files will *not* be overwritten.
*/
if (!PWALTDIR() && getarg(args, 'm') != NULL && pwd->pw_dir && *pwd->pw_dir == '/' && pwd->pw_dir[1]) {
copymkdir(pwd->pw_dir, cnf->dotdir, cnf->homemode, pwd->pw_uid, pwd->pw_gid);
pw_log(cnf, mode, W_USER, "%s(%ld) home %s made",
pwd->pw_name, (long) pwd->pw_uid, pwd->pw_dir);
}
/*
* Finally, send mail to the new user as well, if we are asked to
*/
if (mode == M_ADD && !PWALTDIR() && cnf->newmail && *cnf->newmail && (fp = fopen(cnf->newmail, "r")) != NULL) {
FILE *pfp = popen(_PATH_SENDMAIL " -t", "w");
if (pfp == NULL)
warn("sendmail");
else {
fprintf(pfp, "From: root\n" "To: %s\n" "Subject: Welcome!\n\n", pwd->pw_name);
while (fgets(line, sizeof(line), fp) != NULL) {
/* Do substitutions? */
fputs(line, pfp);
}
pclose(pfp);
pw_log(cnf, mode, W_USER, "%s(%ld) new user mail sent",
pwd->pw_name, (long) pwd->pw_uid);
}
fclose(fp);
}
return EXIT_SUCCESS;
}
static uid_t
pw_uidpolicy(struct userconf * cnf, struct cargs * args)
{
struct passwd *pwd;
uid_t uid = (uid_t) - 1;
struct carg *a_uid = getarg(args, 'u');
/*
* Check the given uid, if any
*/
if (a_uid != NULL) {
uid = (uid_t) atol(a_uid->val);
if ((pwd = GETPWUID(uid)) != NULL && getarg(args, 'o') == NULL)
errx(EX_DATAERR, "uid `%ld' has already been allocated", (long) pwd->pw_uid);
} else {
struct bitmap bm;
/*
* We need to allocate the next available uid under one of
* two policies a) Grab the first unused uid b) Grab the
* highest possible unused uid
*/
if (cnf->min_uid >= cnf->max_uid) { /* Sanity
* claus^H^H^H^Hheck */
cnf->min_uid = 1000;
cnf->max_uid = 32000;
}
bm = bm_alloc(cnf->max_uid - cnf->min_uid + 1);
/*
* Now, let's fill the bitmap from the password file
*/
SETPWENT();
while ((pwd = GETPWENT()) != NULL)
if (pwd->pw_uid >= (uid_t) cnf->min_uid && pwd->pw_uid <= (uid_t) cnf->max_uid)
bm_setbit(&bm, pwd->pw_uid - cnf->min_uid);
ENDPWENT();
/*
* Then apply the policy, with fallback to reuse if necessary
*/
if (cnf->reuse_uids || (uid = (uid_t) (bm_lastset(&bm) + cnf->min_uid + 1)) > cnf->max_uid)
uid = (uid_t) (bm_firstunset(&bm) + cnf->min_uid);
/*
* Another sanity check
*/
if (uid < cnf->min_uid || uid > cnf->max_uid)
errx(EX_SOFTWARE, "unable to allocate a new uid - range fully used");
bm_dealloc(&bm);
}
return uid;
}
static uid_t
pw_gidpolicy(struct userconf * cnf, struct cargs * args, char *nam, gid_t prefer)
{
struct group *grp;
gid_t gid = (uid_t) - 1;
struct carg *a_gid = getarg(args, 'g');
/*
* If no arg given, see if default can help out
*/
if (a_gid == NULL && cnf->default_group && *cnf->default_group)
a_gid = addarg(args, 'g', cnf->default_group);
/*
* Check the given gid, if any
*/
SETGRENT();
if (a_gid != NULL) {
if ((grp = GETGRNAM(a_gid->val)) == NULL) {
gid = (gid_t) atol(a_gid->val);
if ((gid == 0 && !isdigit((unsigned char)*a_gid->val)) || (grp = GETGRGID(gid)) == NULL)
errx(EX_NOUSER, "group `%s' is not defined", a_gid->val);
}
gid = grp->gr_gid;
} else if ((grp = GETGRNAM(nam)) != NULL && grp->gr_mem[0] == NULL) {
gid = grp->gr_gid; /* Already created? Use it anyway... */
} else {
struct cargs grpargs;
char tmp[32];
LIST_INIT(&grpargs);
addarg(&grpargs, 'n', nam);
/*
* We need to auto-create a group with the user's name. We
* can send all the appropriate output to our sister routine
* bit first see if we can create a group with gid==uid so we
* can keep the user and group ids in sync. We purposely do
* NOT check the gid range if we can force the sync. If the
* user's name dups an existing group, then the group add
* function will happily handle that case for us and exit.
*/
if (GETGRGID(prefer) == NULL) {
sprintf(tmp, "%lu", (unsigned long) prefer);
addarg(&grpargs, 'g', tmp);
}
if (getarg(args, 'N'))
{
addarg(&grpargs, 'N', NULL);
addarg(&grpargs, 'q', NULL);
gid = pw_group(cnf, M_NEXT, &grpargs);
}
else
{
pw_group(cnf, M_ADD, &grpargs);
if ((grp = GETGRNAM(nam)) != NULL)
gid = grp->gr_gid;
}
a_gid = LIST_FIRST(&grpargs);
while (a_gid != NULL) {
struct carg *t = LIST_NEXT(a_gid, list);
LIST_REMOVE(a_gid, list);
a_gid = t;
}
}
ENDGRENT();
return gid;
}
static time_t
pw_pwdpolicy(struct userconf * cnf, struct cargs * args)
{
time_t result = 0;
time_t now = time(NULL);
struct carg *arg = getarg(args, 'p');
if (arg != NULL) {
if ((result = parse_date(now, arg->val)) == now)
errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
} else if (cnf->password_days > 0)
result = now + ((long) cnf->password_days * 86400L);
return result;
}
static time_t
pw_exppolicy(struct userconf * cnf, struct cargs * args)
{
time_t result = 0;
time_t now = time(NULL);
struct carg *arg = getarg(args, 'e');
if (arg != NULL) {
if ((result = parse_date(now, arg->val)) == now)
errx(EX_DATAERR, "invalid date/time `%s'", arg->val);
} else if (cnf->expire_days > 0)
result = now + ((long) cnf->expire_days * 86400L);
return result;
}
static char *
pw_homepolicy(struct userconf * cnf, struct cargs * args, char const * user)
{
struct carg *arg = getarg(args, 'd');
if (arg)
return arg->val;
else {
static char home[128];
if (cnf->home == NULL || *cnf->home == '\0')
errx(EX_CONFIG, "no base home directory set");
sprintf(home, "%s/%s", cnf->home, user);
return home;
}
}
static char *
shell_path(char const * path, char *shells[], char *sh)
{
if (sh != NULL && (*sh == '/' || *sh == '\0'))
return sh; /* specified full path or forced none */
else {
char *p;
char paths[_UC_MAXLINE];
/*
* We need to search paths
*/
strlcpy(paths, path, sizeof(paths));
for (p = strtok(paths, ": \t\r\n"); p != NULL; p = strtok(NULL, ": \t\r\n")) {
int i;
static char shellpath[256];
if (sh != NULL) {
sprintf(shellpath, "%s/%s", p, sh);
if (access(shellpath, X_OK) == 0)
return shellpath;
} else
for (i = 0; i < _UC_MAXSHELLS && shells[i] != NULL; i++) {
sprintf(shellpath, "%s/%s", p, shells[i]);
if (access(shellpath, X_OK) == 0)
return shellpath;
}
}
if (sh == NULL)
errx(EX_OSFILE, "can't find shell `%s' in shell paths", sh);
errx(EX_CONFIG, "no default shell available or defined");
return NULL;
}
}
static char *
pw_shellpolicy(struct userconf * cnf, struct cargs * args, char *newshell)
{
char *sh = newshell;
struct carg *arg = getarg(args, 's');
if (newshell == NULL && arg != NULL)
sh = arg->val;
return shell_path(cnf->shelldir, cnf->shells, sh ? sh : cnf->shell_default);
}
#define SALTSIZE 32
static char const chars[] = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ./";
char *
pw_pwcrypt(char *password)
{
int i;
char salt[SALTSIZE + 1];
char *cryptpw;
static char buf[256];
/*
* Calculate a salt value
*/
for (i = 0; i < SALTSIZE; i++)
salt[i] = chars[arc4random_uniform(sizeof(chars) - 1)];
salt[SALTSIZE] = '\0';
cryptpw = crypt(password, salt);
if (cryptpw == NULL)
errx(EX_CONFIG, "crypt(3) failure");
return strcpy(buf, cryptpw);
}
static char *
pw_password(struct userconf * cnf, struct cargs * args, char const * user)
{
int i, l;
char pwbuf[32];
switch (cnf->default_password) {
case -1: /* Random password */
l = (arc4random() % 8 + 8); /* 8 - 16 chars */
for (i = 0; i < l; i++)
pwbuf[i] = chars[arc4random_uniform(sizeof(chars)-1)];
pwbuf[i] = '\0';
/*
* We give this information back to the user
*/
if (getarg(args, 'h') == NULL && getarg(args, 'H') == NULL &&
getarg(args, 'N') == NULL) {
if (isatty(STDOUT_FILENO))
printf("Password for '%s' is: ", user);
printf("%s\n", pwbuf);
fflush(stdout);
}
break;
case -2: /* No password at all! */
return "";
case 0: /* No login - default */
default:
return "*";
case 1: /* user's name */
strlcpy(pwbuf, user, sizeof(pwbuf));
break;
}
return pw_pwcrypt(pwbuf);
}
static int
print_user(struct passwd * pwd, int pretty, int v7)
{
if (!pretty) {
char *buf;
if (!v7)
pwd->pw_passwd = (pwd->pw_passwd == NULL) ? "" : "*";
buf = v7 ? pw_make_v7(pwd) : pw_make(pwd);
printf("%s\n", buf);
free(buf);
} else {
int j;
char *p;
struct group *grp = GETGRGID(pwd->pw_gid);
char uname[60] = "User &", office[60] = "[None]",
wphone[60] = "[None]", hphone[60] = "[None]";
char acexpire[32] = "[None]", pwexpire[32] = "[None]";
struct tm * tptr;
if ((p = strtok(pwd->pw_gecos, ",")) != NULL) {
strlcpy(uname, p, sizeof(uname));
if ((p = strtok(NULL, ",")) != NULL) {
strlcpy(office, p, sizeof(office));
if ((p = strtok(NULL, ",")) != NULL) {
strlcpy(wphone, p, sizeof(wphone));
if ((p = strtok(NULL, "")) != NULL) {
strlcpy(hphone, p,
sizeof(hphone));
}
}
}
}
/*
* Handle '&' in gecos field
*/
if ((p = strchr(uname, '&')) != NULL) {
int l = strlen(pwd->pw_name);
int m = strlen(p);
memmove(p + l, p + 1, m);
memmove(p, pwd->pw_name, l);
*p = (char) toupper((unsigned char)*p);
}
if (pwd->pw_expire > (time_t)0 && (tptr = localtime(&pwd->pw_expire)) != NULL)
strftime(acexpire, sizeof acexpire, "%c", tptr);
if (pwd->pw_change > (time_t)0 && (tptr = localtime(&pwd->pw_change)) != NULL)
strftime(pwexpire, sizeof pwexpire, "%c", tptr);
printf("Login Name: %-15s #%-12ld Group: %-15s #%ld\n"
" Full Name: %s\n"
" Home: %-26.26s Class: %s\n"
" Shell: %-26.26s Office: %s\n"
"Work Phone: %-26.26s Home Phone: %s\n"
"Acc Expire: %-26.26s Pwd Expire: %s\n",
pwd->pw_name, (long) pwd->pw_uid,
grp ? grp->gr_name : "(invalid)", (long) pwd->pw_gid,
uname, pwd->pw_dir, pwd->pw_class,
pwd->pw_shell, office, wphone, hphone,
acexpire, pwexpire);
SETGRENT();
j = 0;
while ((grp=GETGRENT()) != NULL)
{
int i = 0;
while (grp->gr_mem[i] != NULL)
{
if (strcmp(grp->gr_mem[i], pwd->pw_name)==0)
{
printf(j++ == 0 ? " Groups: %s" : ",%s", grp->gr_name);
break;
}
++i;
}
}
ENDGRENT();
printf("%s", j ? "\n" : "");
}
return EXIT_SUCCESS;
}
char *
pw_checkname(u_char *name, int gecos)
{
char showch[8];
u_char const *badchars, *ch, *showtype;
int reject;
ch = name;
reject = 0;
if (gecos) {
/* See if the name is valid as a gecos (comment) field. */
badchars = ":!@";
showtype = "gecos field";
} else {
/* See if the name is valid as a userid or group. */
badchars = " ,\t:+&#%$^()!@~*?<>=|\\/\"";
showtype = "userid/group name";
/* Userids and groups can not have a leading '-'. */
if (*ch == '-')
reject = 1;
}
if (!reject) {
while (*ch) {
if (strchr(badchars, *ch) != NULL || *ch < ' ' ||
*ch == 127) {
reject = 1;
break;
}
/* 8-bit characters are only allowed in GECOS fields */
if (!gecos && (*ch & 0x80)) {
reject = 1;
break;
}
ch++;
}
}
/*
* A `$' is allowed as the final character for userids and groups,
* mainly for the benefit of samba.
*/
if (reject && !gecos) {
if (*ch == '$' && *(ch + 1) == '\0') {
reject = 0;
ch++;
}
}
if (reject) {
snprintf(showch, sizeof(showch), (*ch >= ' ' && *ch < 127)
? "`%c'" : "0x%02x", *ch);
errx(EX_DATAERR, "invalid character %s at position %td in %s",
showch, (ch - name), showtype);
}
if (!gecos && (ch - name) > LOGNAMESIZE)
errx(EX_DATAERR, "name too long `%s' (max is %d)", name,
LOGNAMESIZE);
return (char *)name;
}
static void
rmat(uid_t uid)
{
DIR *d = opendir("/var/at/jobs");
if (d != NULL) {
struct dirent *e;
while ((e = readdir(d)) != NULL) {
struct stat st;
if (strncmp(e->d_name, ".lock", 5) != 0 &&
stat(e->d_name, &st) == 0 &&
!S_ISDIR(st.st_mode) &&
st.st_uid == uid) {
char tmp[MAXPATHLEN];
sprintf(tmp, "/usr/bin/atrm %s", e->d_name);
system(tmp);
}
}
closedir(d);
}
}
static void
rmopie(char const * name)
{
static const char etcopie[] = "/etc/opiekeys";
FILE *fp = fopen(etcopie, "r+");
if (fp != NULL) {
char tmp[1024];
off_t atofs = 0;
int length = strlen(name);
while (fgets(tmp, sizeof tmp, fp) != NULL) {
if (strncmp(name, tmp, length) == 0 && tmp[length]==' ') {
if (fseek(fp, atofs, SEEK_SET) == 0) {
fwrite("#", 1, 1, fp); /* Comment username out */
}
break;
}
atofs = ftell(fp);
}
/*
* If we got an error of any sort, don't update!
*/
fclose(fp);
}
}
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