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freebsd/crypto/heimdal/appl/su/su.c

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/*
* Copyright (c) 1999 - 2001 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* 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. Neither the name of KTH nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY KTH AND ITS 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 KTH OR ITS 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. */
#include <config.h>
RCSID("$Id: su.c,v 1.23 2002/01/09 19:40:12 nectar Exp $");
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#ifdef HAVE_PATHS_H
#include <paths.h>
#endif
#ifdef HAVE_SHADOW_H
#include <shadow.h>
#endif
#include <pwd.h>
#ifdef HAVE_OPENSSL
#include <openssl/des.h>
#else
#include <des.h>
#endif
#include <krb5.h>
#include <kafs.h>
#include <err.h>
#include <roken.h>
#include <getarg.h>
#include <kafs.h>
#ifndef _PATH_DEFPATH
#define _PATH_DEFPATH "/usr/bin:/bin"
#endif
#ifndef _PATH_BSHELL
#define _PATH_BSHELL "/bin/sh"
#endif
int kerberos_flag = 1;
int csh_f_flag;
int full_login;
int env_flag;
char *kerberos_instance = "root";
int help_flag;
int version_flag;
char *cmd;
struct getargs args[] = {
{ "kerberos", 'K', arg_negative_flag, &kerberos_flag,
"don't use kerberos" },
{ NULL, 'f', arg_flag, &csh_f_flag,
"don't read .cshrc" },
{ "full", 'l', arg_flag, &full_login,
"simulate full login" },
{ NULL, 'm', arg_flag, &env_flag,
"leave environment unmodified" },
{ "instance", 'i', arg_string, &kerberos_instance,
"root instance to use" },
{ "command", 'c', arg_string, &cmd,
"command to execute" },
{ "help", 'h', arg_flag, &help_flag },
{ "version", 0, arg_flag, &version_flag },
};
static void
usage (int ret)
{
arg_printusage (args,
sizeof(args)/sizeof(*args),
NULL,
"[login [shell arguments]]");
exit (ret);
}
static void
free_info(struct passwd *p)
{
free (p->pw_name);
free (p->pw_passwd);
free (p->pw_dir);
free (p->pw_shell);
free (p);
}
static struct passwd*
dup_info(const struct passwd *pwd)
{
struct passwd *info;
info = malloc(sizeof(*info));
if(info == NULL)
return NULL;
info->pw_name = strdup(pwd->pw_name);
info->pw_passwd = strdup(pwd->pw_passwd);
info->pw_uid = pwd->pw_uid;
info->pw_gid = pwd->pw_gid;
info->pw_dir = strdup(pwd->pw_dir);
info->pw_shell = strdup(pwd->pw_shell);
if(info->pw_name == NULL || info->pw_passwd == NULL ||
info->pw_dir == NULL || info->pw_shell == NULL) {
free_info (info);
return NULL;
}
return info;
}
#ifdef KRB5
static krb5_context context;
static krb5_ccache ccache;
#endif
static int
krb5_verify(const struct passwd *login_info,
const struct passwd *su_info,
const char *kerberos_instance)
{
#ifdef KRB5
krb5_error_code ret;
krb5_principal p;
char *login_name = NULL;
#if defined(HAVE_GETLOGIN) && !defined(POSIX_GETLOGIN)
login_name = getlogin();
#endif
ret = krb5_init_context (&context);
if (ret) {
#if 0
warnx("krb5_init_context failed: %d", ret);
#endif
return 1;
}
if (login_name == NULL || strcmp (login_name, "root") == 0)
login_name = login_info->pw_name;
if (strcmp (su_info->pw_name, "root") == 0)
ret = krb5_make_principal(context, &p, NULL,
login_name,
kerberos_instance,
NULL);
else
ret = krb5_make_principal(context, &p, NULL,
su_info->pw_name,
NULL);
if(ret)
return 1;
if(su_info->pw_uid != 0 || krb5_kuserok(context, p, su_info->pw_name)) {
ret = krb5_cc_gen_new(context, &krb5_mcc_ops, &ccache);
if(ret) {
#if 1
krb5_warn(context, ret, "krb5_cc_gen_new");
#endif
krb5_free_principal (context, p);
return 1;
}
ret = krb5_verify_user_lrealm(context, p, ccache, NULL, TRUE, NULL);
krb5_free_principal (context, p);
if(ret) {
krb5_cc_destroy(context, ccache);
switch (ret) {
case KRB5_LIBOS_PWDINTR :
break;
case KRB5KRB_AP_ERR_BAD_INTEGRITY:
case KRB5KRB_AP_ERR_MODIFIED:
krb5_warnx(context, "Password incorrect");
break;
default :
krb5_warn(context, ret, "krb5_verify_user");
break;
}
return 1;
}
return 0;
}
krb5_free_principal (context, p);
#endif
return 1;
}
#ifdef KRB5
static int
krb5_start_session(void)
{
krb5_ccache ccache2;
char *cc_name;
int ret;
ret = krb5_cc_gen_new(context, &krb5_fcc_ops, &ccache2);
if (ret) {
krb5_cc_destroy(context, ccache);
return 1;
}
ret = krb5_cc_copy_cache(context, ccache, ccache2);
asprintf(&cc_name, "%s:%s", krb5_cc_get_type(context, ccache2),
krb5_cc_get_name(context, ccache2));
esetenv("KRB5CCNAME", cc_name, 1);
/* we want to export this even if we don't directly support KRB4 */
{
#ifndef TKT_ROOT
#define TKT_ROOT "/tmp/tkt"
#endif
int fd;
char tkfile[256];
strlcpy(tkfile, TKT_ROOT, sizeof(tkfile));
strlcat(tkfile, "_XXXXXX", sizeof(tkfile));
fd = mkstemp(tkfile);
if(fd >= 0) {
close(fd);
esetenv("KRBTKFILE", tkfile, 1);
}
}
#ifdef KRB4
/* convert creds? */
if(k_hasafs()) {
if (k_setpag() == 0)
krb5_afslog(context, ccache2, NULL, NULL);
}
#endif
krb5_cc_close(context, ccache2);
krb5_cc_destroy(context, ccache);
return 0;
}
#endif
static int
verify_unix(struct passwd *su)
{
char prompt[128];
char pw_buf[1024];
char *pw;
int r;
if(su->pw_passwd != NULL && *su->pw_passwd != '\0') {
snprintf(prompt, sizeof(prompt), "%s's password: ", su->pw_name);
r = des_read_pw_string(pw_buf, sizeof(pw_buf), prompt, 0);
if(r != 0)
exit(0);
pw = crypt(pw_buf, su->pw_passwd);
memset(pw_buf, 0, sizeof(pw_buf));
if(strcmp(pw, su->pw_passwd) != 0)
return 1;
}
return 0;
}
int
main(int argc, char **argv)
{
int i, optind = 0;
char *su_user;
struct passwd *su_info;
struct passwd *login_info;
struct passwd *pwd;
char *shell;
int ok = 0;
int kerberos_error=1;
setprogname (argv[0]);
if(getarg(args, sizeof(args) / sizeof(args[0]), argc, argv, &optind))
usage(1);
for (i=0; i < optind; i++)
if (strcmp(argv[i], "-") == 0) {
full_login = 1;
break;
}
if(help_flag)
usage(0);
if(version_flag) {
print_version(NULL);
exit(0);
}
if(optind >= argc)
su_user = "root";
else
su_user = argv[optind++];
pwd = k_getpwnam(su_user);
if(pwd == NULL)
errx (1, "unknown login %s", su_user);
if (pwd->pw_uid == 0 && strcmp ("root", su_user) != 0) {
syslog (LOG_ALERT, "NIS attack, user %s has uid 0", su_user);
errx (1, "unknown login %s", su_user);
}
su_info = dup_info(pwd);
if (su_info == NULL)
errx (1, "malloc: out of memory");
pwd = getpwuid(getuid());
if(pwd == NULL)
errx(1, "who are you?");
login_info = dup_info(pwd);
if (login_info == NULL)
errx (1, "malloc: out of memory");
if(env_flag)
shell = login_info->pw_shell;
else
shell = su_info->pw_shell;
if(shell == NULL || *shell == '\0')
shell = _PATH_BSHELL;
if(kerberos_flag && ok == 0 &&
(kerberos_error=krb5_verify(login_info, su_info, kerberos_instance)) == 0)
ok++;
if(ok == 0 && login_info->pw_uid && verify_unix(su_info) != 0) {
printf("Sorry!\n");
exit(1);
}
#ifdef HAVE_GETSPNAM
{ struct spwd *sp;
long today;
sp = getspnam(su_info->pw_name);
if (sp != NULL) {
today = time(0)/(24L * 60 * 60);
if (sp->sp_expire > 0) {
if (today >= sp->sp_expire) {
if (login_info->pw_uid)
errx(1,"Your account has expired.");
else
printf("Your account has expired.");
}
else if (sp->sp_expire - today < 14)
printf("Your account will expire in %d days.\n",
(int)(sp->sp_expire - today));
}
if (sp->sp_max > 0) {
if (today >= sp->sp_lstchg + sp->sp_max) {
if (login_info->pw_uid)
errx(1,"Your password has expired. Choose a new one.");
else
printf("Your password has expired. Choose a new one.");
}
else if (today >= sp->sp_lstchg + sp->sp_max - sp->sp_warn)
printf("Your account will expire in %d days.\n",
(int)(sp->sp_lstchg + sp->sp_max -today));
}
}
}
#endif
{
char *tty = ttyname (STDERR_FILENO);
syslog (LOG_NOTICE | LOG_AUTH, tty ? "%s to %s" : "%s to %s on %s",
login_info->pw_name, su_info->pw_name, tty);
}
if(!env_flag) {
if(full_login) {
char *t = getenv ("TERM");
environ = malloc (10 * sizeof (char *));
if (environ == NULL)
err (1, "malloc");
environ[0] = NULL;
esetenv ("PATH", _PATH_DEFPATH, 1);
if (t)
esetenv ("TERM", t, 1);
if (chdir (su_info->pw_dir) < 0)
errx (1, "no directory");
}
if (full_login || su_info->pw_uid)
esetenv ("USER", su_info->pw_name, 1);
esetenv("HOME", su_info->pw_dir, 1);
esetenv("SHELL", shell, 1);
}
{
int i;
char **args;
char *p;
p = strrchr(shell, '/');
if(p)
p++;
else
p = shell;
if (strcmp(p, "csh") != 0)
csh_f_flag = 0;
args = malloc(((cmd ? 2 : 0) + 1 + argc - optind + 1 + csh_f_flag) * sizeof(*args));
if (args == NULL)
err (1, "malloc");
i = 0;
if(full_login)
asprintf(&args[i++], "-%s", p);
else
args[i++] = p;
if (cmd) {
args[i++] = "-c";
args[i++] = cmd;
}
if (csh_f_flag)
args[i++] = "-f";
for (argv += optind; *argv; ++argv)
args[i++] = *argv;
args[i] = NULL;
if(setgid(su_info->pw_gid) < 0)
err(1, "setgid");
if (initgroups (su_info->pw_name, su_info->pw_gid) < 0)
err (1, "initgroups");
if(setuid(su_info->pw_uid) < 0
|| (su_info->pw_uid != 0 && setuid(0) == 0))
err(1, "setuid");
#ifdef KRB5
if (!kerberos_error)
krb5_start_session();
#endif
execv(shell, args);
}
exit(1);
}
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