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New login program.

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git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@4061 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Johan Danielsson
1997-11-28 23:45:49 +00:00
parent 87835efd8c
commit 87167acf87
4 changed files with 504 additions and 0 deletions
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14
appl/login/Makefile.am Normal file
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# $Id$
AUTOMAKE_OPTIONS = no-dependencies foreign
INCLUDES = -I$(top_builddir)/include $(INCLUDE_krb4)
bin_PROGRAMS = login
login_SOURCES = login.c read_string.c
LDADD = $(top_builddir)/lib/krb5/libkrb5.a \
$(top_builddir)/lib/des/libdes.a \
$(LIB_krb4) \
$(top_builddir)/lib/asn1/libasn1.a \
$(top_builddir)/lib/roken/libroken.a

301
appl/login/login.c Normal file
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/*
* Copyright (c) 1997 Kungliga Tekniska H<>gskolan
* (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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Kungliga Tekniska
* H<>gskolan and its contributors.
*
* 4. Neither the name of the Institute 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 THE INSTITUTE 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 THE INSTITUTE 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.
*/
#include "login_locl.h"
RCSID("$Id$");
char **env;
int num_env;
void
extend_env(char *str)
{
env = realloc(env, (num_env + 1) * sizeof(*env));
if(env == NULL)
errx(1, "Out of memory!");
env[num_env++] = str;
}
void
add_env(const char *var, const char *value)
{
int i;
char *str;
asprintf(&str, "%s=%s", var, value);
if(str == NULL)
errx(1, "Out of memory!");
for(i = 0; i < num_env; i++)
if(strncmp(env[i], var, strlen(var)) == 0 &&
env[i][strlen(var)] == '='){
free(env[i]);
env[i] = str;
return;
}
extend_env(str);
}
void
exec_shell(const char *shell, int fallback)
{
char *sh;
const char *p;
p = strrchr(shell, '/');
if(p)
p++;
else
p = shell;
asprintf(&sh, "-%s", p);
extend_env(NULL);
execle(shell, sh, NULL, env);
if(fallback){
warnx("Can't exec %s, trying %s",
shell, _PATH_BSHELL);
execle(_PATH_BSHELL, "-sh", NULL, env);
err(1, "%s", _PATH_BSHELL);
}
err(1, "%s", shell);
}
void
do_login(struct passwd *pwd)
{
int rootlogin = (pwd->pw_uid == 0);
update_utmp();
#ifdef HAVE_SETLOGIN
if(setlogin(pwd->pw_name)){
warn("setlogin(%s)", pwd->pw_name);
if(rootlogin == 0)
exit(1);
}
#endif
#ifdef HAVE_INITGROUPS
if(initgroups(pwd->pw_name, pwd->pw_gid)){
warn("initgroups(%s, %u)", pwd->pw_name, (unsigned)pwd->pw_gid);
if(rootlogin == 0)
exit(1);
}
#endif
if(setgid(pwd->pw_gid)){
warn("setgid(%u)", (unsigned)pwd->pw_gid);
if(rootlogin == 0)
exit(1);
}
if(setuid(pwd->pw_uid)){
warn("setuid(%u)", (unsigned)pwd->pw_uid);
if(rootlogin == 0)
exit(1);
}
if (chdir(pwd->pw_dir) < 0) {
fprintf(stderr, "No home directory \"%s\"!\n", pwd->pw_dir);
if (chdir("/"))
exit(0);
pwd->pw_dir = "/";
fprintf(stderr, "Logging in with home = \"/\".\n");
}
add_env("HOME", pwd->pw_dir);
add_env("USER", pwd->pw_name);
add_env("LOGNAME", pwd->pw_name);
exec_shell(pwd->pw_shell, rootlogin);
}
int
krb5_verify(struct passwd *pwd, const char *password)
{
krb5_error_code ret;
krb5_context context;
krb5_principal princ;
krb5_ccache id;
ret = krb5_init_context(&context);
if(ret)
return 1;
ret = krb5_parse_name(context, pwd->pw_name, &princ);
if(ret){
krb5_free_context(context);
return 1;
}
ret = krb5_cc_gen_new(context, &krb5_mcc_ops, &id);
if(ret){
krb5_free_principal(context, princ);
krb5_free_context(context);
return 1;
}
ret = krb5_verify_user(context,
princ,
id,
password,
1,
NULL);
if(ret == 0){
krb5_ccache id2;
char residual[32];
/* copy credentials to file cache */
snprintf(residual, sizeof(residual), "FILE:/tmp/krb5cc_%u",
(unsigned)pwd->pw_uid);
krb5_cc_resolve(context, residual, &id2);
if(seteuid(pwd->pw_uid))
;
ret = krb5_cc_copy_cache(context, id, id2);
if(seteuid(0))
;
ret = krb5_cc_close(context, id2);
add_env("KRB5CCNAME", residual);
ret = 0;
}
krb5_cc_destroy(context, id);
krb5_free_principal(context, princ);
krb5_free_context(context);
return ret;
}
int
check_password(struct passwd *pwd, const char *password)
{
if(pwd->pw_passwd == NULL)
return 1;
if(pwd->pw_passwd[0] == '\0'){
#ifdef ALLOW_NULL_PASSWORD
return password[0] != '\0';
#else
return 1;
#endif
}
if(strcmp(pwd->pw_passwd, crypt(password, pwd->pw_passwd)) == 0)
return 0;
#ifdef KRB5
if(krb5_verify(pwd, password) == 0)
return 0;
#endif
#ifdef KRB4
#endif
return 1;
}
int f_flag;
int p_flag;
int r_flag;
int version_flag;
int help_flag;
char *remote_host;
struct getargs args[] = {
#if 0
{ NULL, 'a' },
{ NULL, 'd' },
#endif
{ "authenticated", 'f', arg_flag, &f_flag, "don't authenticate" },
{ "host", 'h', arg_string, &remote_host, "remote host", "hostname" },
{ "preserve-environment", 'p', arg_flag, &p_flag,
"don't purge environment" },
{ NULL, 'r', arg_flag, &r_flag, "foo" },
{ "version", 0, arg_flag, &version_flag, "print version" },
{ "help", 0, arg_flag, &help_flag, NULL }
};
int nargs = sizeof(args) / sizeof(args[0]);
void
usage(int status)
{
arg_printusage(args, nargs, "");
exit(status);
}
int
main(int argc, char **argv)
{
int max_tries = 5;
int try;
char username[32];
int optind = 0;
int ask = 1;
set_progname(argv[0]);
openlog("login", LOG_ODELAY, LOG_AUTH);
if (geteuid() != 0)
err(1, "only root may use login, use su");
if (getarg (args, sizeof(args) / sizeof(args[0]), argc, argv,
&optind))
usage (1);
argc -= optind;
argv += optind;
if(help_flag)
usage(0);
if (version_flag)
errx(0, "(%s-%s)", PACKAGE, VERSION);
if(*argv){
if(strchr(*argv, '=') == NULL && strcmp(*argv, "-") != 0){
strncpy(username, *argv, sizeof(username));
username[sizeof(username) - 1] = 0;
ask = 0;
}
}
for(try = 0; try < max_tries; try++){
struct passwd *pwd;
char password[128];
if(ask){
read_string("login: ", username, sizeof(username), 1);
f_flag = r_flag = 0;
}
if(f_flag == 0)
read_string("Password: ", password, sizeof(password), 0);
pwd = getpwnam(username);
if(pwd == NULL){
fprintf(stderr, "Login incorrect.\n");
ask = 1;
continue;
}
if(f_flag == 0 && check_password(pwd, password)){
fprintf(stderr, "Login incorrect.\n");
continue;
}
do_login(pwd);
}
exit(1);
}

64
appl/login/login_locl.h Normal file
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/*
* Copyright (c) 1997 Kungliga Tekniska H<>gskolan
* (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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Kungliga Tekniska
* H<>gskolan and its contributors.
*
* 4. Neither the name of the Institute 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 THE INSTITUTE 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 THE INSTITUTE 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.
*/
/* $Id$ */
#ifndef __LOGIN_LOCL_H__
#define __LOGIN_LOCL_H__
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <syslog.h>
#include <paths.h>
#include <signal.h>
#include <termios.h>
#include <err.h>
#include <pwd.h>
#include <roken.h>
#include <getarg.h>
#ifdef KRB5
#include <krb5.h>
#endif
int read_string(const char*, char*, size_t, int);
#endif /* __LOGIN_LOCL_H__ */

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appl/login/read_string.c Normal file
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/*
* Copyright (c) 1997 Kungliga Tekniska H<>gskolan
* (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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Kungliga Tekniska
* H<>gskolan and its contributors.
*
* 4. Neither the name of the Institute 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 THE INSTITUTE 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 THE INSTITUTE 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.
*/
#include "login_locl.h"
RCSID("$Id$");
static sig_atomic_t intr_flag;
static void
intr(int sig)
{
intr_flag++;
}
int
read_string(const char *prompt, char *buf, size_t len, int echo)
{
struct sigaction sigs[47];
struct sigaction sa;
FILE *tty;
int ret = 0;
int of = 0;
int i;
int c;
char *p;
struct termios t_new, t_old;
memset(&sa, 0, sizeof(sa));
sa.sa_handler = intr;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
for(i = 0; i < sizeof(sigs) / sizeof(sigs[0]); i++)
sigaction(i, &sa, &sigs[i]);
if((tty = fopen("/dev/tty", "r")) == NULL)
tty = stdin;
fprintf(stderr, "%s", prompt);
fflush(stderr);
if(echo == 0){
tcgetattr(fileno(tty), &t_old);
memcpy(&t_new, &t_old, sizeof(t_new));
t_new.c_lflag &= ~ECHO;
tcsetattr(fileno(tty), TCSANOW, &t_new);
}
intr_flag = 0;
p = buf;
while(intr_flag == 0){
c = getc(tty);
if(c == EOF){
ret = 1;
break;
}
if(c == '\n')
break;
if(of == 0)
*p++ = c;
of = (p == buf + len);
}
if(of)
p--;
*p = 0;
if(echo == 0){
printf("\n");
tcsetattr(fileno(tty), TCSANOW, &t_old);
}
if(tty != stdin)
fclose(tty);
for(i = 0; i < sizeof(sigs) / sizeof(sigs[0]); i++)
sigaction(i, &sigs[i], NULL);
return of || intr_flag || ret;
}
#if 0
int main()
{
char s[128];
int ret;
ret = read_string("foo: ", s, sizeof(s), 0);
printf("%d ->%s<-\n", ret, s);
}
#endif