/
user.c
2187 lines (2074 loc) · 54.1 KB
/
user.c
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/* $NetBSD: user.c,v 1.75.4.2 2006/10/15 15:52:26 bouyer Exp $ */
/*
* Copyright (c) 1999 Alistair G. Crooks. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Alistair G. Crooks.
* 4. The name of the author may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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.
*/
#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1999 \
The NetBSD Foundation, Inc. All rights reserved.");
__RCSID("$NetBSD: user.c,v 1.75.4.2 2006/10/15 15:52:26 bouyer Exp $");
#endif
#include <sys/types.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <ctype.h>
#include <dirent.h>
#include <err.h>
#include <fcntl.h>
#include <grp.h>
#include <paths.h>
#include <pwd.h>
#include <regex.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <time.h>
#include <unistd.h>
#include <util.h>
#include "defs.h"
#include "usermgmt.h"
/* this struct describes a uid range */
typedef struct range_t {
int r_from; /* low uid */
int r_to; /* high uid */
} range_t;
/* this struct encapsulates the user information */
typedef struct user_t {
int u_flags; /* see below */
int u_uid; /* uid of user */
char *u_password; /* encrypted password */
char *u_comment; /* comment field */
char *u_home; /* home directory */
char *u_primgrp; /* primary group */
int u_groupc; /* # of secondary groups */
const char *u_groupv[NGROUPS_MAX]; /* secondary groups */
char *u_shell; /* user's shell */
char *u_basedir; /* base directory for home */
char *u_expire; /* when password will expire */
char *u_inactive; /* when account will expire */
char *u_skeldir; /* directory for startup files */
char *u_class; /* login class */
unsigned u_rsize; /* size of range array */
unsigned u_rc; /* # of ranges */
range_t *u_rv; /* the ranges */
unsigned u_defrc; /* # of ranges in defaults */
int u_preserve; /* preserve uids on deletion */
int u_allow_samba; /* allow trailing '$' for samba login names */
} user_t;
/* flags for which fields of the user_t replace the passwd entry */
enum {
F_COMMENT = 0x0001,
F_DUPUID = 0x0002,
F_EXPIRE = 0x0004,
F_GROUP = 0x0008,
F_HOMEDIR = 0x0010,
F_MKDIR = 0x0020,
F_INACTIVE = 0x0040,
F_PASSWORD = 0x0080,
F_SECGROUP = 0x0100,
F_SHELL = 0x0200,
F_UID = 0x0400,
F_USERNAME = 0x0800,
F_CLASS = 0x1000
};
#define CONFFILE "/etc/usermgmt.conf"
#ifndef DEF_GROUP
#define DEF_GROUP "users"
#endif
#ifndef DEF_BASEDIR
#define DEF_BASEDIR "/home"
#endif
#ifndef DEF_SKELDIR
#define DEF_SKELDIR "/etc/skel"
#endif
#ifndef DEF_SHELL
#define DEF_SHELL _PATH_CSHELL
#endif
#ifndef DEF_COMMENT
#define DEF_COMMENT ""
#endif
#ifndef DEF_LOWUID
#define DEF_LOWUID 1000
#endif
#ifndef DEF_HIGHUID
#define DEF_HIGHUID 60000
#endif
#ifndef DEF_INACTIVE
#define DEF_INACTIVE 0
#endif
#ifndef DEF_EXPIRE
#define DEF_EXPIRE NULL
#endif
#ifndef DEF_CLASS
#define DEF_CLASS ""
#endif
#ifndef WAITSECS
#define WAITSECS 10
#endif
#ifndef NOBODY_UID
#define NOBODY_UID 32767
#endif
/* some useful constants */
enum {
MaxShellNameLen = 256,
MaxFileNameLen = MAXPATHLEN,
MaxUserNameLen = 32,
MaxFieldNameLen = 32,
MaxCommandLen = 2048,
MaxEntryLen = 2048,
PasswordLength = 2048,
DES_Len = 13,
LowGid = DEF_LOWUID,
HighGid = DEF_HIGHUID
};
/* Full paths of programs used here */
#define CHMOD "/bin/chmod"
#define CHOWN "/usr/sbin/chown"
#define MKDIR "/bin/mkdir"
#define MV "/bin/mv"
#define NOLOGIN "/sbin/nologin"
#define PAX "/bin/pax"
#define RM "/bin/rm"
#define UNSET_INACTIVE "Null (unset)"
#define UNSET_EXPIRY "Null (unset)"
static int asystem(const char *fmt, ...)
__attribute__((__format__(__printf__, 1, 2)));
static int verbose;
/* if *cpp is non-null, free it, then assign `n' chars of `s' to it */
static void
memsave(char **cpp, const char *s, size_t n)
{
if (*cpp != NULL) {
FREE(*cpp);
}
NEWARRAY(char, *cpp, n + 1, exit(1));
(void) memcpy(*cpp, s, n);
(*cpp)[n] = '\0';
}
/* a replacement for system(3) */
static int
asystem(const char *fmt, ...)
{
va_list vp;
char buf[MaxCommandLen];
int ret;
va_start(vp, fmt);
(void) vsnprintf(buf, sizeof(buf), fmt, vp);
va_end(vp);
if (verbose) {
(void) printf("Command: %s\n", buf);
}
if ((ret = system(buf)) != 0) {
warnx("[Warning] can't system `%s'", buf);
}
return ret;
}
/* remove a users home directory, returning 1 for success (ie, no problems encountered) */
static int
removehomedir(const char *user, int uid, const char *dir)
{
struct stat st;
/* userid not root? */
if (uid == 0) {
warnx("Not deleting home directory `%s'; userid is 0", dir);
return 0;
}
/* directory exists (and is a directory!) */
if (stat(dir, &st) < 0) {
warnx("Home directory `%s' doesn't exist", dir);
return 0;
}
if (!S_ISDIR(st.st_mode)) {
warnx("Home directory `%s' is not a directory", dir);
return 0;
}
/* userid matches directory owner? */
if (st.st_uid != uid) {
warnx("User `%s' doesn't own directory `%s', not removed", user, dir);
return 0;
}
(void) seteuid(uid);
/* we add the "|| true" to keep asystem() quiet if there is a non-zero exit status. */
(void) asystem("%s -rf %s > /dev/null 2>&1 || true", RM, dir);
(void) seteuid(0);
if (rmdir(dir) < 0) {
warnx("Unable to remove all files in `%s'", dir);
return 0;
}
return 1;
}
#define NetBSD_1_4_K 104110000
#if defined(__NetBSD_Version__) && (__NetBSD_Version__ < NetBSD_1_4_K)
/* bounds checking strncpy */
static int
strlcpy(char *to, char *from, size_t tosize)
{
size_t n;
int fromsize;
fromsize = strlen(from);
n = MIN(tosize - 1, fromsize);
(void) memcpy(to, from, n);
to[n] = '\0';
return fromsize;
}
#endif /* NetBSD < 1.4K */
/*
* Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com>
* 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.
* 3. The name of the author may not be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED ``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
* THE AUTHOR 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.
*/
/*
* research has shown that NetBSD 1.3H was the first version of -current
* with asprintf in libc. agc
*/
#define NetBSD_1_3_H 103080000
#if defined(__NetBSD_Version__) && (__NetBSD_Version__ < NetBSD_1_3_H)
int
asprintf(char **str, char const *fmt, ...)
{
int ret;
va_list ap;
FILE f;
unsigned char *_base;
f._flags = __SWR | __SSTR | __SALC;
f._bf._base = f._p = (unsigned char *)malloc(128);
if (f._bf._base == NULL)
goto err;
f._bf._size = f._w = 127; /* Leave room for the NUL */
va_start(ap, fmt);
ret = vfprintf(&f, fmt, ap);
va_end(ap);
if (ret == -1)
goto err;
*f._p = '\0';
_base = realloc(f._bf._base, (size_t)(ret + 1));
if (_base == NULL)
goto err;
*str = (char *)_base;
return (ret);
err:
if (f._bf._base)
free(f._bf._base);
*str = NULL;
return (-1);
}
#endif /* NetBSD < 1.3H */
/* return 1 if all of `s' is numeric */
static int
is_number(char *s)
{
for ( ; *s ; s++) {
if (!isdigit((unsigned char) *s)) {
return 0;
}
}
return 1;
}
/*
* check that the effective uid is 0 - called from funcs which will
* modify data and config files.
*/
static void
checkeuid(void)
{
if (geteuid() != 0) {
errx(EXIT_FAILURE, "Program must be run as root");
}
}
/* copy any dot files into the user's home directory */
static int
copydotfiles(char *skeldir, int uid, int gid, char *dir)
{
struct dirent *dp;
DIR *dirp;
int n;
if ((dirp = opendir(skeldir)) == NULL) {
warn("can't open source . files dir `%s'", skeldir);
return 0;
}
for (n = 0; (dp = readdir(dirp)) != NULL && n == 0 ; ) {
if (strcmp(dp->d_name, ".") == 0 ||
strcmp(dp->d_name, "..") == 0) {
continue;
}
n = 1;
}
(void) closedir(dirp);
if (n == 0) {
warnx("No \"dot\" initialisation files found");
} else {
(void) asystem("cd %s && %s -rw -pe %s . %s",
skeldir, PAX, (verbose) ? "-v" : "", dir);
}
(void) asystem("%s -R -h %d:%d %s", CHOWN, uid, gid, dir);
(void) asystem("%s -R u+w %s", CHMOD, dir);
return n;
}
/* create a group entry with gid `gid' */
static int
creategid(char *group, int gid, const char *name)
{
struct stat st;
FILE *from;
FILE *to;
char buf[MaxEntryLen];
char f[MaxFileNameLen];
int fd;
int cc;
if (getgrnam(group) != NULL) {
warnx("group `%s' already exists", group);
return 0;
}
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't create gid for `%s': can't open `%s'", name, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't create gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: fdopen `%s' failed", f);
return 0;
}
while ((cc = fread(buf, sizeof(char), sizeof(buf), from)) > 0) {
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: short write to `%s'", f);
return 0;
}
}
(void) fprintf(to, "%s:*:%d:%s\n", group, gid, name);
(void) fclose(from);
(void) fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't create gid: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
syslog(LOG_INFO, "new group added: name=%s, gid=%d", group, gid);
return 1;
}
/* modify the group entry with name `group' to be newent */
static int
modify_gid(char *group, char *newent)
{
struct stat st;
FILE *from;
FILE *to;
char buf[MaxEntryLen];
char f[MaxFileNameLen];
char *colon;
int groupc;
int entc;
int fd;
int cc;
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't create gid for `%s': can't open `%s'", group, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't create gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: fdopen `%s' failed", f);
return 0;
}
groupc = strlen(group);
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if ((colon = strchr(buf, ':')) == NULL) {
warn("badly formed entry `%s'", buf);
continue;
}
entc = (int)(colon - buf);
if (entc == groupc && strncmp(group, buf, (unsigned) entc) == 0) {
if (newent == NULL) {
continue;
} else {
cc = strlen(newent);
(void) strlcpy(buf, newent, sizeof(buf));
}
}
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: short write to `%s'", f);
return 0;
}
}
(void) fclose(from);
(void) fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't create gid: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
if (newent == NULL) {
syslog(LOG_INFO, "group deleted: name=%s", group);
} else {
syslog(LOG_INFO, "group information modified: name=%s", group);
}
return 1;
}
/* modify the group entries for all `groups', by adding `user' */
static int
append_group(char *user, int ngroups, const char **groups)
{
struct group *grp;
struct stat st;
FILE *from;
FILE *to;
char buf[MaxEntryLen];
char f[MaxFileNameLen];
char *colon;
int groupc;
int entc;
int fd;
int nc;
int cc;
int i;
int j;
for (i = 0 ; i < ngroups ; i++) {
if ((grp = getgrnam(groups[i])) == NULL) {
warnx("can't append group `%s' for user `%s'", groups[i], user);
} else {
for (j = 0 ; grp->gr_mem[j] ; j++) {
if (strcmp(user, grp->gr_mem[j]) == 0) {
/* already in it */
groups[i] = "";
}
}
}
}
if ((from = fopen(_PATH_GROUP, "r")) == NULL) {
warn("can't append group for `%s': can't open `%s'", user, _PATH_GROUP);
return 0;
}
if (flock(fileno(from), LOCK_EX | LOCK_NB) < 0) {
warn("can't lock `%s'", _PATH_GROUP);
}
(void) fstat(fileno(from), &st);
(void) snprintf(f, sizeof(f), "%s.XXXXXX", _PATH_GROUP);
if ((fd = mkstemp(f)) < 0) {
(void) fclose(from);
warn("can't create gid: mkstemp failed");
return 0;
}
if ((to = fdopen(fd, "w")) == NULL) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: fdopen `%s' failed", f);
return 0;
}
while (fgets(buf, sizeof(buf), from) != NULL) {
cc = strlen(buf);
if ((colon = strchr(buf, ':')) == NULL) {
warn("badly formed entry `%s'", buf);
continue;
}
entc = (int)(colon - buf);
for (i = 0 ; i < ngroups ; i++) {
if ((groupc = strlen(groups[i])) == 0) {
continue;
}
if (entc == groupc && strncmp(groups[i], buf, (unsigned) entc) == 0) {
if ((nc = snprintf(&buf[cc - 1],
sizeof(buf) - cc + 1,
"%s%s\n",
(buf[cc - 2] == ':') ? "" : ",",
user)) < 0) {
warnx("Warning: group `%s' entry too long", groups[i]);
}
cc += nc - 1;
}
}
if (fwrite(buf, sizeof(char), (unsigned) cc, to) != cc) {
(void) fclose(from);
(void) close(fd);
(void) unlink(f);
warn("can't create gid: short write to `%s'", f);
return 0;
}
}
(void) fclose(from);
(void) fclose(to);
if (rename(f, _PATH_GROUP) < 0) {
(void) unlink(f);
warn("can't create gid: can't rename `%s' to `%s'", f, _PATH_GROUP);
return 0;
}
(void) chmod(_PATH_GROUP, st.st_mode & 07777);
return 1;
}
/* return 1 if `login' is a valid login name */
static int
valid_login(char *login_name, int allow_samba)
{
unsigned char *cp;
if (strlen(login_name) >= LOGIN_NAME_MAX) {
return 0;
}
for (cp = login_name ; *cp ; cp++) {
if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-') {
#ifdef EXTENSIONS
/* check for a trailing '$' in a Samba user name */
if (allow_samba && *cp == '$' && *(cp + 1) == 0x0) {
return 1;
}
#endif
return 0;
}
}
return 1;
}
/* return 1 if `group' is a valid group name */
static int
valid_group(char *group)
{
unsigned char *cp;
for (cp = group ; *cp ; cp++) {
if (!isalnum(*cp)) {
return 0;
}
}
return 1;
}
/* find the next gid in the range lo .. hi */
static int
getnextgid(int *gidp, int lo, int hi)
{
for (*gidp = lo ; *gidp < hi ; *gidp += 1) {
if (getgrgid((gid_t)*gidp) == NULL) {
return 1;
}
}
return 0;
}
#ifdef EXTENSIONS
/* save a range of uids */
static int
save_range(user_t *up, char *cp)
{
int from;
int to;
int i;
if (up->u_rsize == 0) {
up->u_rsize = 32;
NEWARRAY(range_t, up->u_rv, up->u_rsize, return(0));
} else if (up->u_rc == up->u_rsize) {
up->u_rsize *= 2;
RENEW(range_t, up->u_rv, up->u_rsize, return(0));
}
if (up->u_rv && sscanf(cp, "%d..%d", &from, &to) == 2) {
for (i = up->u_defrc ; i < up->u_rc ; i++) {
if (up->u_rv[i].r_from == from && up->u_rv[i].r_to == to) {
break;
}
}
if (i == up->u_rc) {
up->u_rv[up->u_rc].r_from = from;
up->u_rv[up->u_rc].r_to = to;
up->u_rc += 1;
}
} else {
warnx("Bad range `%s'", cp);
return 0;
}
return 1;
}
#endif
/* set the defaults in the defaults file */
static int
setdefaults(user_t *up)
{
char template[MaxFileNameLen];
FILE *fp;
int ret;
int fd;
#ifdef EXTENSIONS
int i;
#endif
(void) snprintf(template, sizeof(template), "%s.XXXXXX", CONFFILE);
if ((fd = mkstemp(template)) < 0) {
warnx("can't mkstemp `%s' for writing", CONFFILE);
return 0;
}
if ((fp = fdopen(fd, "w")) == NULL) {
warn("can't fdopen `%s' for writing", CONFFILE);
return 0;
}
ret = 1;
if (fprintf(fp, "group\t\t%s\n", up->u_primgrp) <= 0 ||
fprintf(fp, "base_dir\t%s\n", up->u_basedir) <= 0 ||
fprintf(fp, "skel_dir\t%s\n", up->u_skeldir) <= 0 ||
fprintf(fp, "shell\t\t%s\n", up->u_shell) <= 0 ||
#ifdef EXTENSIONS
fprintf(fp, "class\t\t%s\n", up->u_class) <= 0 ||
#endif
fprintf(fp, "inactive\t%s\n", (up->u_inactive == NULL) ? UNSET_INACTIVE : up->u_inactive) <= 0 ||
fprintf(fp, "expire\t\t%s\n", (up->u_expire == NULL) ? UNSET_EXPIRY : up->u_expire) <= 0 ||
fprintf(fp, "preserve\t%s\n", (up->u_preserve == 0) ? "false" : "true") <= 0) {
warn("can't write to `%s'", CONFFILE);
ret = 0;
}
#ifdef EXTENSIONS
for (i = (up->u_defrc != up->u_rc) ? up->u_defrc : 0 ; i < up->u_rc ; i++) {
if (fprintf(fp, "range\t\t%d..%d\n", up->u_rv[i].r_from, up->u_rv[i].r_to) <= 0) {
warn("can't write to `%s'", CONFFILE);
ret = 0;
}
}
#endif
(void) fclose(fp);
if (ret) {
ret = ((rename(template, CONFFILE) == 0) && (chmod(CONFFILE, 0644) == 0));
}
return ret;
}
/* read the defaults file */
static void
read_defaults(user_t *up)
{
struct stat st;
size_t lineno;
size_t len;
FILE *fp;
unsigned char *cp;
unsigned char *s;
memsave(&up->u_primgrp, DEF_GROUP, strlen(DEF_GROUP));
memsave(&up->u_basedir, DEF_BASEDIR, strlen(DEF_BASEDIR));
memsave(&up->u_skeldir, DEF_SKELDIR, strlen(DEF_SKELDIR));
memsave(&up->u_shell, DEF_SHELL, strlen(DEF_SHELL));
memsave(&up->u_comment, DEF_COMMENT, strlen(DEF_COMMENT));
#ifdef EXTENSIONS
memsave(&up->u_class, DEF_CLASS, strlen(DEF_CLASS));
#endif
up->u_rsize = 16;
up->u_defrc = 0;
NEWARRAY(range_t, up->u_rv, up->u_rsize, exit(1));
up->u_inactive = DEF_INACTIVE;
up->u_expire = DEF_EXPIRE;
if ((fp = fopen(CONFFILE, "r")) == NULL) {
if (stat(CONFFILE, &st) < 0 && !setdefaults(up)) {
warn("can't create `%s' defaults file", CONFFILE);
}
fp = fopen(CONFFILE, "r");
}
if (fp != NULL) {
while ((s = fparseln(fp, &len, &lineno, NULL, 0)) != NULL) {
if (strncmp(s, "group", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_primgrp, cp, strlen(cp));
} else if (strncmp(s, "base_dir", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_basedir, cp, strlen(cp));
} else if (strncmp(s, "skel_dir", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_skeldir, cp, strlen(cp));
} else if (strncmp(s, "shell", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_shell, cp, strlen(cp));
#ifdef EXTENSIONS
} else if (strncmp(s, "class", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
memsave(&up->u_class, cp, strlen(cp));
#endif
} else if (strncmp(s, "inactive", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
if (strcmp(cp, UNSET_INACTIVE) == 0) {
if (up->u_inactive) {
FREE(up->u_inactive);
}
up->u_inactive = NULL;
} else {
memsave(&up->u_inactive, cp, strlen(cp));
}
#ifdef EXTENSIONS
} else if (strncmp(s, "range", 5) == 0) {
for (cp = s + 5 ; *cp && isspace(*cp) ; cp++) {
}
(void) save_range(up, cp);
#endif
#ifdef EXTENSIONS
} else if (strncmp(s, "preserve", 8) == 0) {
for (cp = s + 8 ; *cp && isspace(*cp) ; cp++) {
}
up->u_preserve = (strncmp(cp, "true", 4) == 0) ? 1 :
(strncmp(cp, "yes", 3) == 0) ? 1 :
atoi(cp);
#endif
} else if (strncmp(s, "expire", 6) == 0) {
for (cp = s + 6 ; *cp && isspace(*cp) ; cp++) {
}
if (strcmp(cp, UNSET_EXPIRY) == 0) {
if (up->u_expire) {
FREE(up->u_expire);
}
up->u_expire = NULL;
} else {
memsave(&up->u_expire, cp, strlen(cp));
}
}
(void) free(s);
}
(void) fclose(fp);
}
if (up->u_rc == 0) {
up->u_rv[up->u_rc].r_from = DEF_LOWUID;
up->u_rv[up->u_rc].r_to = DEF_HIGHUID;
up->u_rc += 1;
}
up->u_defrc = up->u_rc;
}
/* return the next valid unused uid */
static int
getnextuid(int sync_uid_gid, int *uid, int low_uid, int high_uid)
{
for (*uid = low_uid ; *uid <= high_uid ; (*uid)++) {
if (getpwuid((uid_t)(*uid)) == NULL && *uid != NOBODY_UID) {
if (sync_uid_gid) {
if (getgrgid((gid_t)(*uid)) == NULL) {
return 1;
}
} else {
return 1;
}
}
}
return 0;
}
/* structure which defines a password type */
typedef struct passwd_type_t {
const char *type; /* optional type descriptor */
int desc_length; /* length of type descriptor */
int length; /* length of password */
const char *regex; /* regexp to output the password */
int re_sub; /* subscript of regexp to use */
} passwd_type_t;
static passwd_type_t passwd_types[] = {
{ "$2a", 3, 54, "\\$[^$]+\\$[^$]+\\$(.*)", 1 }, /* Blowfish */
{ "$1", 2, 34, NULL, 0 }, /* MD5 */
{ "", 0, DES_Len,NULL, 0 }, /* standard DES */
{ NULL, -1, -1, NULL, 0 } /* none - terminate search */
};
/* return non-zero if it's a valid password - check length for cipher type */
static int
valid_password_length(char *newpasswd)
{
passwd_type_t *pwtp;
regmatch_t matchv[10];
regex_t r;
for (pwtp = passwd_types ; pwtp->desc_length >= 0 ; pwtp++) {
if (strncmp(newpasswd, pwtp->type, pwtp->desc_length) == 0) {
if (pwtp->regex == NULL) {
return strlen(newpasswd) == pwtp->length;
}
(void) regcomp(&r, pwtp->regex, REG_EXTENDED);
if (regexec(&r, newpasswd, 10, matchv, 0) == 0) {
regfree(&r);
return (int)(matchv[pwtp->re_sub].rm_eo - matchv[pwtp->re_sub].rm_so + 1) == pwtp->length;
}
regfree(&r);
}
}
return 0;
}
/* look for a valid time, return 0 if it was specified but bad */
static int
scantime(time_t *tp, char *s)
{
struct tm tm;
*tp = 0;
if (s != NULL) {
(void) memset(&tm, 0, sizeof(tm));
if (strptime(s, "%c", &tm) != NULL) {
*tp = mktime(&tm);
} else if (strptime(s, "%B %d %Y", &tm) != NULL) {
*tp = mktime(&tm);
} else if (isdigit((unsigned char) *s)) {
*tp = atoi(s);
} else {
return 0;
}
}
return 1;
}
/* add a user */
static int
adduser(char *login_name, user_t *up)
{
struct group *grp;
struct stat st;
time_t expire;
time_t inactive;
char password[PasswordLength + 1];
char home[MaxFileNameLen];
char buf[MaxFileNameLen];
int sync_uid_gid;
int masterfd;
int ptmpfd;
int gid;
int cc;
int i;
if (!valid_login(login_name, up->u_allow_samba)) {
errx(EXIT_FAILURE, "`%s' is not a valid login name", login_name);
}
if ((masterfd = open(_PATH_MASTERPASSWD, O_RDONLY)) < 0) {
err(EXIT_FAILURE, "can't open `%s'", _PATH_MASTERPASSWD);
}
if (flock(masterfd, LOCK_EX | LOCK_NB) < 0) {
err(EXIT_FAILURE, "can't lock `%s'", _PATH_MASTERPASSWD);
}
pw_init();
if ((ptmpfd = pw_lock(WAITSECS)) < 0) {
(void) close(masterfd);
err(EXIT_FAILURE, "can't obtain pw_lock");
}
while ((cc = read(masterfd, buf, sizeof(buf))) > 0) {
if (write(ptmpfd, buf, (size_t)(cc)) != cc) {
(void) close(masterfd);
(void) close(ptmpfd);
pw_abort();
err(EXIT_FAILURE, "short write to /etc/ptmp (not %d chars)", cc);
}
}
/* if no uid was specified, get next one in [low_uid..high_uid] range */
sync_uid_gid = (strcmp(up->u_primgrp, "=uid") == 0);
if (up->u_uid == -1) {
int got_id = 0;
/*
* Look for a free UID in the command line ranges (if any).
* These start after the ranges specified in the config file.