Index: cgcs-users-1.0-r0/AUTHORS.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/AUTHORS.orig @@ -0,0 +1,15 @@ +AUTHORS OF PROJECT IBSH + +Attila Nagyidai + * Original program author, project admin, developer. + +Shy + * Developer, debugger, tester, and many more. + +Witzy + * Developer, debugger, tester, and many more. + +http://www.ibsh.net +irc: +irc.freenode.net #ibsh +irc.geek-power.org #ibsh Index: cgcs-users-1.0-r0/BUGS.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/BUGS.orig @@ -0,0 +1,19 @@ +** Open BUGS ** +None, so far. + +** Fixed BUGS ** +- Input length checking on all inputs, string copies, etc. is fixed. +- The myscanf function will no longer accept more then 80 chars at once, +so ibsh hopefully wont crash on a too long input. +- Added signal.h in the header file, the lack of it caused compilation +problems on some systems. +- Fixed the infinite loop in DelBadFiles. This function is temporarily +taken out of the project +- Removed the involvment of /bin/sh from system. Added path checking. +- In jail root, not only ../ is not allowed, but .. too. +- Fixed a bug, that happened on bsd, when the user pressed ^D. +- Fixed a bug with opendir +- Fixed a format string vulnerability in logprintbadfile(). Thanks to +Kim Streich for the report. + +2005.05.23 Index: cgcs-users-1.0-r0/ChangeLog.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/ChangeLog.orig @@ -0,0 +1,34 @@ +0.3e - a buffer overflow and a string bug, both found by RazoR (Nikolay Alexandrov), fixed. +0.3d - a format string vulnerability, found by Kim Streich, is fixed. +0.3b-0.3c - bugfixes. +0.3a - The admin has the opportunity, to create separate cmds file for each user. + This way the sysadmin has complete control over sensitive applications, which + should only be allowed to a selected few. + - The admin has the opportunity, to create separate xtns file for each user. + - The extensions policy has been changed. Now both globals.xtns and the user + extension files will list the extensions, that are _allowed_ ! In earlier versions, + the forbidden extensions were listed, that is allow everything, except to deny a few. + From this version on, it's deny everything, except allow the ones, listed in these files. + - While the code for the search of illegal/dangerous material stored in user space is + back, it will not erase any files any more. Instead, it will remove all + rights from that file, so it can not be executed, or read. Files, with the +x bit set, + will be chmodded to -x. This is another "defense line" to stop the user to execute + programs, stored in user space. + - The access to all linux binaries, and source code files, stored in user space, if any, + will be blocked. + - Absolute path for restricted users can not be longer then 255 characters. All files, + that are longer (with full path), will be renamed. + - Minor bug fixes. + +0.2a - Major bug fixes. + - User activities are logged with syslog. + - hhsytem revised, hardened. /bin/sh isnt involved anymore into program starting. + If the home directory is in the PATH, it's ignored. + - erasing illegal content is temporarily suspended and removed. + +0.1b - Major bug fixes. + - The config files are accidentally missing from this release! + +0.1a - The first version of the program. + +2005.05.23. Index: cgcs-users-1.0-r0/CONTRIBUTORS.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/CONTRIBUTORS.orig @@ -0,0 +1,7 @@ +CONTRIBUTORS TO PROJECT IBSH + +Kim Streich + * bug finder, debugger, tester. + +RazoR (Nikolay Alexandrov) + * bug finder, debugger, tester. Index: cgcs-users-1.0-r0/COPYING.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/COPYING.orig @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. Index: cgcs-users-1.0-r0/COPYRIGHT.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/COPYRIGHT.orig @@ -0,0 +1,17 @@ +This file is part of IBSH (Iron Bars Shell) , a restricted Unix shell +Copyright (C) 2005 Attila Nagyidai + +This program is free software; you can redistribute it and/or +modify it under the terms of the GNU General Public License +as published by the Free Software Foundation; either version 2 +of the License, or (at your option) any later version. + +This program is distributed in the hope that it will be useful, +but WITHOUT ANY WARRANTY; without even the implied warranty of +MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +GNU General Public License for more details. + +You should have received a copy of the GNU General Public License +along with this program; if not, write to the Free Software +Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + Index: cgcs-users-1.0-r0/INSTALL.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/INSTALL.orig @@ -0,0 +1,23 @@ +Installing ibsh is really easy, so no need for the usual sections +in this document. There is no configure script either, so if +something wrong, make will fail. + +# make ibsh +# make ibsh_install + +Optionally: + +# make clean + + +To uninstall ibsh: + +# make ibsh_uninstall + + +Of course you will have to enable this shell by: +# echo /bin/ibsh >> /etc/shells +or however you like it. +And make sure the permissions read 0755 ! + +2005.03.24. Index: cgcs-users-1.0-r0/main.c.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/main.c.orig @@ -0,0 +1,233 @@ +/* + Created: 03.19.05 11:34:57 by Attila Nagyidai + + $Id: C\040Console.c,v 1.1.2.1 2003/08/13 00:38:46 neum Exp $ + + This file is part of IBSH (Iron Bars Shell) , a restricted Unix shell + Copyright (C) 2005 Attila Nagyidai + + This program is free software; you can redistribute it and/or + modify it under the terms of the GNU General Public License + as published by the Free Software Foundation; either version 2 + of the License, or (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + + Author: Attila Nagyidai + Email: na@ent.hu + + Co-Author: Shy + Email: shy@cpan.org + + Co-Author: Witzy + Email: stazzz@altern.org + + URL: http://ibsh.sourceforge.net + IRC: irc.freenode.net #ibsh + RSS, Statistics, etc: http://sourceforge.net/projects/ibsh/ + +*/ + +/* Header files */ +#include "ibsh.h" + +/* Main: */ +/* Handle arguments, read config files, start command processing. */ +/* IBSH doesnt use any command line arguments, but my text editor */ +/* uses this code in all new c files to create. And i didnt have the */ +/* heart to remove it. ;p */ +/* Technical Description: */ +/* Get the passwd entry for the user. The uid is easily aquired, since */ +/* it is the real user id. After that, grab the passwd file entry upon */ +/* the id, and copy the information to the loggedin struct. */ +/* Add some signal handlers too. */ +/* The infinite loop: */ +/* Get the current directory, the full path. Compute the jailpath from that, */ +/* that is the directories below the users homedir, which is the jail root. */ +/* The jail ceiling if you like. Print some prompt to the user with the jailpath, */ +/* and read stdin for incoming commands. Filter out the bad commands, typos, the */ +/* not allowed commands. It the command is ok, execute it. If it is a shell builtin, */ +/* use our builtin code, otherwise use execve. After execve, check if the user didnt */ +/* use the last command to create some illegal content. If yes, erase that. Give the */ +/* notice only afterwards. */ +int main(int argc, char **argv) +{ + char temp[STRING_SIZE], *buf; + struct stat info; + uid_t ruid, euid; + gid_t rgid, egid; + + + /* setuid protection */ + ruid = getuid(); + euid = geteuid(); + rgid = getgid(); + egid = getegid(); + if ( (ruid!=euid) || (ruid==0) || (euid==0) || (rgid!=egid) || (rgid==0) || (egid==0) ) { + OPENLOG; + syslog(LOG_ERR, "setuid/setgid violation!"); + CLOSELOG; + printf("ibsh: setuid/setgid violation!! exiting...\n"); +#ifdef DEBUG + printf("ruid: %d;euid: %d;rgid: %d;egid: %d\n", ruid,euid,rgid,egid); +#endif + exit(0); + } + + /* To Do: The code of your application goes here */ + /* First part: */ + /* Get essential information about the user who got this shell: */ + /* first the username, then the user id. Upon this, retrieve the */ + /* user's record in the passwd file. */ + bzero(&loggedin, sizeof(loggedin)); + loggedin.uid = getuid(); + loggedin.record = getpwuid(loggedin.uid); + if ( loggedin.record == NULL ) { + loggedin.record = getpwnam(loggedin.uname); + if ( loggedin.record == NULL ) { + openlog(loggedin.uname, LOG_PID, LOG_AUTH); + syslog(LOG_ERR, "Can not obtain user information"); + printf("Can not obtain user information\n"); + closelog(); + exit(0); + } + } + strncpy(loggedin.uname, loggedin.record->pw_name, PAM_SIZE); + strncpy(loggedin.udir, loggedin.record->pw_dir, STRING_SIZE); + + /* Second part: */ + /* Handle some signal catching. Read the configuration files. */ + signal( SIGINT, SIG_IGN ); + signal( SIGQUIT, SIG_IGN ); + signal( SIGTERM, SIG_IGN ); + signal( SIGTSTP, SIG_IGN ); + LoadConfig(); + + /* Command mode */ + if(argc == 3) { + if ( argv[1][1] == 'c' ) { + if ( CommandOK(argv[2], loggedin.udir, "/", filtered_command) == 1) { + exitcode = hhsystem(filtered_command); + OPENLOG; + syslog(LOG_INFO, "command %s ordered, command %s has been executed.", + argv[2], filtered_command); + printf("command %s ordered, command %s has been executed.\n", + argv[2], filtered_command); + CLOSELOG; + exit(exitcode); + } + printf("CommandOK failed (%s/%s)\n", loggedin.udir, filtered_command); + exit(0); + } + else { + printf("Invalid are (%s)\n", argv[1]); + exit(0); + } + } + + OPENLOG; + syslog(LOG_INFO, "user %s has logged in.", loggedin.uname); + CLOSELOG; + + +#ifdef INCLUDE_DELETE_BAD_FILES + DelBadFiles(loggedin.udir); +#endif + if ( chdir (loggedin.udir) < 0 ) + return -1; + + + /* Third part: */ + /* Start reading and processing the user issued commands. */ + /* Split the command by the spaces, filter out anything, */ + /* that would allow the user to access files outside the */ + /* jail. Filter out multiples and pipes as well. No program */ + /* will be allowed to run, unless it is mentioned in the */ + /* config files. Files that are created with an extension */ + /* that is listed in the other config file, must be deleted! */ + for ( ; ; ) { + /* Where is he ? */ + if ( getcwd(real_path, STRING_SIZE) == NULL ) + return -1; + GetPositionInJail(real_path, loggedin.udir, jail_path); + if ( (strlen(jail_path)) == 0 ) { + strncpy(jail_path, "/", 2); + } + /* We don't want the user to know where he actually is. */ + /* This is the prompt! */ + printf("[%s]%% ", jail_path); + /* scanf("%s", user_command); */ + myscanf(user_command, real_path); + /* Command interpretation and execution. */ + if ( (CommandOK(user_command, loggedin.udir, jail_path, filtered_command)) == 0 ) { + printf("Sorry, can't let you do that!\n"); + log_attempt(loggedin.uname); /* v0.2a */ + continue; + } + /* If the user issued command starts with a shell builtin. */ + bzero(temp, strlen(temp)); + if ( (buf = strstr(filtered_command, "cd")) != NULL ) { + if ( (strcmp(buf, filtered_command)) == 0 ) { + LTrim3(filtered_command, temp); + if ( (strcmp(temp, real_path)) != 0 ) { + if ( (strcmp(temp, "..")) == 0 ) { + PathMinusOne(jail_path, temp, 1,sizeof(temp)); + } + if ( (strcmp(temp, "/")) == 0 ) { + strncpy(temp, loggedin.udir, LINE_SIZE); + } + exitcode = chdir(temp); + if ( exitcode == -1 ) { + printf("ibsh: cd: %s: No such file or directory\n", temp); + } + } + continue; + } + } + else if ( (buf = strstr(filtered_command, "pwd")) != NULL ) { + if ( (strcmp(buf, filtered_command)) == 0 ) { + printf("%s\n", jail_path); + continue; + } + } + else if ( (buf = strstr(filtered_command, "logout")) != NULL ) { + if ( (strcmp(buf, filtered_command)) == 0 ) { + OPENLOG; + syslog(LOG_INFO, "user %s has logged out.", loggedin.uname); + CLOSELOG; + break; + } + } + else if ( (buf = strstr(filtered_command, "exit")) != NULL ) { + if ( (strcmp(buf, filtered_command)) == 0 ) { + OPENLOG; + syslog(LOG_INFO, "user %s has logged out.", loggedin.uname); + printf("user %s has logged out\n", loggedin.uname); + CLOSELOG; + break; + } + } + else { + exitcode = hhsystem(filtered_command); + if ( exitcode < 0 ) { + printf("%s\n", strerror(errno)); + } + } + if ( getcwd(real_path, STRING_SIZE) == NULL ) + return -1; +#ifdef INCLUDE_BAD_FILES + DelBadFiles(loggedin.udir); +#endif + if ( chdir (real_path) < 0 ) + return 1; + } + return 0; +} + Index: cgcs-users-1.0-r0/Makefile.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/Makefile.orig @@ -0,0 +1,56 @@ +# This is the makefile for ibsh 0.3e +CC = gcc -g -O3 +OBJECTS = main.o command.o jail.o execute.o config.o misc.o antixploit.o delbadfiles.o + +all ibsh: ${OBJECTS} ibsh.h + ${CC} -o ibsh ${OBJECTS} + +main.o: main.c ibsh.h + ${CC} -c main.c + +command.o: command.c ibsh.h + ${CC} -c command.c + +jail.o: jail.c ibsh.h + ${CC} -c jail.c + +execute.o: execute.c ibsh.h + ${CC} -c execute.c + +config.o: config.c ibsh.h + ${CC} -c config.c + +misc.o: misc.c ibsh.h + ${CC} -c misc.c + +antixploit.o: antixploit.c ibsh.h + ${CC} -c antixploit.c + +delbadfiles.o: delbadfiles.c ibsh.h + ${CC} -c delbadfiles.c + +ibsh_install: + cp ./ibsh /bin/ + mkdir /etc/ibsh + mkdir /etc/ibsh/cmds + mkdir /etc/ibsh/xtns + cp ./globals.cmds /etc/ibsh/ + cp ./globals.xtns /etc/ibsh/ + +ibsh_uninstall: + rm -rf /etc/ibsh/globals.cmds + rm -rf /etc/ibsh/globals.xtns + rm -rf /etc/ibsh/cmds/*.* + rm -rf /etc/ibsh/xtns/*.* + rmdir /etc/ibsh/cmds + rmdir /etc/ibsh/xtns + rmdir /etc/ibsh + rm -rf /bin/ibsh + +clean: + rm -rf ibsh + rm -rf *.o + + +# 13:49 2005.04.06. + Index: cgcs-users-1.0-r0/README.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/README.orig @@ -0,0 +1,29 @@ + Iron Bars SHell - a restricted interactive shell. + +Overview + + For long i have been in the search of a decent restricted shell, but in vain. + The few i found, were really easy to hack, and there were quite a few docs + around on the web about hacking restricted shells with a menu interface. + For my definitions, a restricted shell must not only prevent the user to + escape her jail, but also not to access any files outside the jail. + The system administrator must have total control over the restricted shell. + These are the major features incorporated and realized by ibsh. + + +Features + + Please read the changelog. + + +Installation + + Read the INSTALL file. + + +Contact + See Authors file. + + +Attila Nagyidai +2005.05.23. Index: cgcs-users-1.0-r0/Release.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/Release.orig @@ -0,0 +1,17 @@ +This release introduces minor bugfixes, and important new and renewed features. +Erasing evil files in the home directory of the user is incorporated again, with +many improvements. First of all: no file will be erased! Only the access to them +will be blocked. The extension policy has changed, now ibsh blocks those extensions, +that are NOT listed. This goes in sync with the usual method of operation of ibsh. +The execute permission of files in the user space, will be removed. +New customizing features were added: each user now can have her own commands and +extensions file, created and maintained by the system administrator. Some users +(employees) may require access to special programs. User configuration files allow +this access only those, who need it, not for everybody. +Ibsh now scans not only the extensions of files, but the content too! Whatever the permission +for a certain file exists, if that contains source code, or is a linux binary, access +will be blocked. +The absolute path for the users is now limited to 255 characters. Longer, already +existing filenames will be renamed. + +06/04/2005 Index: cgcs-users-1.0-r0/TODO.orig =================================================================== --- /dev/null +++ cgcs-users-1.0-r0/TODO.orig @@ -0,0 +1,10 @@ +TODO + + - tab completion. + - shell variables. + - some changes to the prompt, maybe variable prompt. + - history + - to be able to use corporate, or other large/complicated programs in a safe + working environment, yet be able to share files/work with others. + +2005.05.23.