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2009-03-27 Sebastian Huber <sebastian.huber@embedded-brains.de>

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* Makefile.am, preinstall.am, libmisc/Makefile.am,
	libmisc/shell/shell.c, libmisc/shell/shell.h, telnetd/check_passwd.c,
	telnetd/telnetd.c, telnetd/telnetd.h:
	Generalized login check.
	* libmisc/shell/login.h, libmisc/shell/login_check.c,
	libmisc/shell/login_prompt.c: New files.
	* libmisc/stackchk/check.c: Changed format for blown stack message.
	* libcsupport/src/libio_sockets.c: Removed superfluous cast.
	* libnetworking/rtems/ftpfs.h: Documentation.
This commit is contained in:
Joel Sherrill
2009-03-27 15:31:52 +00:00
parent 8a775c27fc
commit 2649eef33a
3 changed files with 276 additions and 0 deletions
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56
cpukit/libmisc/shell/login.h Normal file
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/**
* @file
*
* @author Sebastian Huber <sebastian.huber@embedded-brains.de>
*
* @brief Login types and functions.
*/
/*
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* Based on work from Chris Johns, Fernando Ruiz and Till Straumann.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#ifndef RTEMS_LOGIN_H
#define RTEMS_LOGIN_H
#include <stdio.h>
#include <rtems.h>
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef bool (*rtems_login_check)(
const char * /* user */,
const char * /* passphrase */
);
bool rtems_shell_login_prompt(
FILE *in,
FILE *out,
const char *device,
rtems_login_check check
);
bool rtems_shell_login_check(
const char *user,
const char *passphrase
);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* RTEMS_LOGIN_H */

58
cpukit/libmisc/shell/login_check.c Normal file
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/**
* @file
*
* @author Sebastian Huber <sebastian.huber@embedded-brains.de>
*
* @brief Shell login check function.
*/
/*
* Copyright (c) 2009
* Embedded Brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* rtems@embedded-brains.de
*
* Based on work from Chris Johns, Fernando Ruiz and Till Straumann.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <sys/types.h>
#include <unistd.h>
#include <pwd.h>
#include <rtems/login.h>
#include <rtems/shell.h>
#include <rtems/userenv.h>
bool rtems_shell_login_check(
const char *user,
const char *passphrase
)
{
struct passwd *pw = getpwnam( user);
/* Valid user? */
if (pw != NULL && strcmp( pw->pw_passwd, "!") != 0) {
setuid( pw->pw_uid);
setgid( pw->pw_gid);
rtems_current_user_env->euid = 0;
rtems_current_user_env->egid = 0;
chown( rtems_current_shell_env->devname, pw->pw_uid, 0);
rtems_current_user_env->euid = pw->pw_uid;
rtems_current_user_env->egid = pw->pw_gid;
if (strcmp( pw->pw_passwd, "*") == 0) {
/* TODO: /etc/shadow */
return true;
} else {
/* TODO: crypt() */
return true;
}
}
return false;
}

162
cpukit/libmisc/shell/login_prompt.c Normal file
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/**
* @file
*
* @author Sebastian Huber <sebastian.huber@embedded-brains.de>
*
* @brief Shell login prompt functions.
*/
/*
* Copyright (c) 2009
* embedded brains GmbH
* Obere Lagerstr. 30
* D-82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* Based on work from Chris Johns, Fernando Ruiz and Till Straumann.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*/
#include <stdio.h>
#include <termios.h>
#include <unistd.h>
#include <ctype.h>
#include <rtems/login.h>
static int rtems_shell_discard( int c, FILE *stream)
{
return c;
}
static void rtems_shell_get_text(
FILE *in,
FILE *out,
char *line,
size_t size
)
{
int fd_in = fileno( in);
int (*put)( int, FILE *) =
out != NULL && isatty( fd_in)
? fputc
: rtems_shell_discard;
size_t i = 0;
if (size < 1) {
return;
}
tcdrain( fd_in);
if (out != NULL){
tcdrain( fileno( out));
}
while (true) {
int c = fgetc( in);
switch (c) {
case EOF:
/* Here comes an ugly hack: The Termios driver's read() handler returns
* 0 to the C library's fgets() if it times out. fgets() interprets
* this (correctly) as EOF, a condition we want to undo since it's not
* really true since we really have a read error (Termios bug?).
*
* As a workaround we push something back and read it again. This
* should simply reset the EOF condition.
*/
if (ungetc( '?', in) == '?') {
fgetc( in);
}
break;
case '\n':
case '\r':
put( '\n', out);
line [i] = '\0';
return;
case 127:
case '\b':
if (i > 0) {
put( '\b', out);
put( ' ', out);
put( '\b', out);
--i;
} else {
put( '\a', out);
}
break;
default:
if (!iscntrl( c)) {
if (i < size - 1) {
line [i] = (char) c;
++i;
put( c, out);
} else {
put( '\a', out);
}
} else {
put( '\a', out);
}
break;
}
}
}
bool rtems_shell_login_prompt(
FILE *in,
FILE *out,
const char *device,
rtems_login_check check
)
{
int fd_in = fileno( in);
struct termios termios_previous;
bool restore_termios = false;
int i = 0;
bool result = false;
if (tcgetattr( fd_in, &termios_previous) == 0) {
struct termios termios_new = termios_previous;
termios_new.c_lflag &= ~ECHO;
termios_new.c_lflag &= ~ICANON;
termios_new.c_cc [VTIME] = 255;
termios_new.c_cc [VMIN] = 0;
restore_termios = tcsetattr( fd_in, TCSANOW, &termios_new) == 0;
}
for (i = 0; i < 3; ++i) {
char user [32];
char passphrase [128];
fprintf( out, "%s login: ", device);
fflush( out);
rtems_shell_get_text( in, out, user, sizeof( user));
fflush( in);
fprintf( out, "Password: ");
fflush( out);
rtems_shell_get_text( in, NULL, passphrase, sizeof( passphrase));
fputc( '\n', out);
result = check( user, passphrase);
if (result) {
break;
}
fprintf( out, "Login incorrect\n\n");
sleep( 2);
}
if (restore_termios) {
/* What to do if restoring the flags fails? */
tcsetattr( fd_in, TCSANOW, &termios_previous);
}
return result;
}