login-utils/README.admutil

   1 README file for the admutils V1.16 for Linux.
   2
   3 See installation instructions at the bottom. Currently the latest versions
   4 of this software is maintained at ftp://ftp.daimi.aau.dk/pub/linux/poe/
   5
   6 LICENSE:
   7 This software is distributed as is without any warranty what so ever.
   8 With respect to copyrights it is covered by the GNU Public License.
   9
  10 Version 1.17 (7-Oct-95):
  11         Added setrlimit() calls to passwd.c and chsh.c to fix security hole
  12         caused by resource limitations. Inspired by Zefram
  13         <A.Main@dcs.warwick.ac.uk>. Also beefed up the ptmp locking in
  14         chsh.c.
  15         Added swap_off() function to shutdown.c by baekgrd@ibm.net
  16         (Anders Baekgaard).
  17         Bugfix in shutdown.c that makes sure wtmp gets closed. By
  18         Alexandre Julliard <julliard@sunsite.unc.edu>.
  19         Fixed bug in passwd.c that made it impossible to change from having
  20         no password into having one.
  21
  22 Version 1.16 (18-Sep-95):
  23         Added feature to passwd.c by Arpad Magossanyi (mag@tas.vein.hu),
  24         so root can give a password for a user on the command line. This
  25         might be useful in a shell script autogenerating passwords for
  26         new users.
  27
  28         Added and updated manual pages for all commands by Rick Faith.
  29
  30 Version 1.15d (21-Aug-95):
  31         Fixed minor nit with salt generation in passwd.c
  32         By Steven Reisman <sar@beehive.mn.org>.
  33
  34 Version 1.15c (5-Jul-95):
  35         passwd does not allow reuse of the old password when changing.
  36         passwd returns 1 if the password is not changed. This was
  37         suggested by Anibal Jodorcovsky <anibal@ee.mcgill.ca> who
  38         also fixed my initial bug in this feature.
  39
  40         passwd uses O_EXCL for opening /etc/ptmp instead of access/fopen.
  41         This was suggested by jorge@un1.satlink.com (Jorge).
  42
  43 Version 1.15a (12-Jun-95):
  44         Fix in last.c so it does not print wtmp entries marked DEAD_PROCESS.
  45         By Andreas Schwab <schwab@issan.informatik.uni-dortmund.de>
  46
  47 Version 1.15 (5-Jun-95):
  48         Man-page fixes, fixes in pathnames.h to adhere to the FSSTND.
  49         Fix by Rickard Faith <faith@cs.unc.edu> to passwd.c, so sanity
  50         checks come before the second entry of the new password.
  51         This is for Linux 1.2, GCC 2.6.2 or later.
  52
  53 Version 1.14a (12-Mar-95):
  54         Fixed passwd and chsh so a username that is a prefix of another
  55         doesn't affect the other's password. After suggested patch
  56         by Valtteri J. Karu <vatekaru@tuug.utu.fi>, but differently!
  57
  58 Version 1.14 (12-Feb-95):
  59         Added options -l, -y, -i to last.c. See last.man
  60
  61 Version 1.13d (26-Jan-95):
  62         Added some comments on request from Rik Faith. Compiled succesfully
  63         on Linux 1.1.73, GCC 2.5.8, libc 4.5.26
  64
  65 Version 1.13c (6-Dec-94):
  66         New versions of passwd and chsh due to Alvaro Martinez Echevarria
  67         <alvaro@enano.etsit.upm.es>, so they will coexist with YP/NIS
  68         passwords.
  69
  70 Version 1.13b (7-Nov-94):
  71         Use fgets() + atoi() in chsh.c instead of scanf().
  72
  73 Version 1.12 (17-Sep-94):
  74         Rik Faith provided patches for passwd.c to let non-alphabetics count
  75         as digits as well, allows more obscure passwords.
  76
  77         Applied patches from Dave Gentzel <gentzel@nova.enet.dec.com>
  78         to prevent dereferencing a NULL pointer, and turn off accounting
  79         in shutdown.c
  80
  81 Version 1.11 (18-Aug-94):
  82         Finally got around to making it a non-alpha version. Just a
  83         little cleanup in Makefile
  84
  85 Version 1.10b (8-Jun-94):
  86         David A. Holland <dholland@husc.harvard.edu> made me aware of a
  87         security leak in passwd and chsh. /etc/ptmp could be forced to
  88         be world-writeable. Fixed by hardwiring an umask of 022 into
  89         passwd and chsh.
  90
  91         Vesa Ruokonen <ruokonen@taivas.lut.fi> sent me a new pathnames.h
  92         file that shouldn't conflict with paths.h.
  93
  94         Cleaned the source a bit for -Wall
  95
  96 Version 1.10a (31-May-94):
  97         Vesa Ruokonen <ruokonen@taivas.lut.fi> provided a patch for
  98         passwd.c such that it will work for multiple usernames for
  99         the same uid. I mimicked his actions on chsh.c. In both cases
 100         I added a check to ensure that even if utmp is hacked, one can
 101         only change the password for users with the same uid.
 102
 103 Version 1.9 (9-Feb-94):
 104         Vesa Ruokonen suggested that newgrp should support passwords in
 105         /etc/group. It now does. I mostly rewrote newgrp to make it
 106         cleaner.
 107
 108 Version 1.8 (19-Jan-94):
 109         Rik Faith provided several patches, especially for passwd.c and
 110         some man-pages.
 111
 112 Version 1.7 (3-Nov-93): changes since 1.6
 113         Shutdown can now be used as a login shell. I forget who sent me the
 114         patch. Example /etc/passwd entry:
 115
 116         shutdown:dLbVbIMx7bVHw:0:0:Stopper:/:/etc/halt
 117
 118         The package should now be prepared to have shutdown in /sbin as well
 119         as in /etc. utmp and wtmp are allowed in /usr/adm too. Both things
 120         are configurable in the Makefile.
 121
 122         <flebbe@cygnus.tat.physik.uni-tuebingen.de> Olaf Flebbe provided a
 123         patch for chsh.c to make it work.
 124
 125         This version is built under linux 0.99.13 with gcc 2.4.3 and
 126         libc 4.4.1
 127
 128 Version 1.6 (1-Jun-93)
 129         Shutdown now looks more like shutdown on SunOS, but not quite. Most
 130         of this was done by Scott Telford (s.telford@ed.ac.uk), but I
 131         butchered his patches somewhat. This version was built under Linux
 132         0.99.9 with GCC 2.3.3 and libc 4.3.3.
 133
 134         "make install" will now install shutdown in /etc instead of /usr/bin
 135
 136 Version 1.5 (13-Dec-92)
 137         This version is tested and built under Linux 0.98P6 with gcc-2.2.2d7
 138         You will have a hard time making it work with the older compilers and
 139         libraries.
 140
 141         Su is now deprecated. I believe that the GNU/FSF version is better.
 142
 143 CONTENTS.
 144 last    -       A new and better last command, a port from BSD done by
 145                 Michael Haardt.
 146                 I put a couple of if's in so LOGIN_PROCESS entries in wtmp
 147                 are not printed.
 148
 149 chsh    -       CHangeSHell changes the shell entry in the passwd file.
 150                 Written from scratch by me.
 151
 152 passwd  -       Changes the password in the passwd file.
 153                 Also done from scratch by me.
 154
 155 su      -       A su(1) command by me.
 156
 157 newgrp  -       Sets the gid if possible, ala su(1), written by Michael
 158                 Haardt.
 159
 160 shutdown -      Shuts down linux. Supports timed shutdowns, and sends
 161                 warnings to all users currently logged in. It then
 162                 kills all processes and unmounts file-systems etc.
 163
 164                 Shutdown also doubles as halt and reboot commands.
 165
 166                 Shutdown leaves the file /etc/nologin behind after shutdown,
 167                 it is wise to have a "rm -f /etc/nologin" in ones /etc/rc
 168
 169                 Shutdown now supports a -s switch, that works in connection
 170                 with the init program in poeigl-1.7 or later, so a singleuser
 171                 reboot is possible.
 172
 173                 Rick Sladkey <jrs@world.std.com> provided patches for better
 174                 umounting code, needed in connection with NFS.
 175
 176                 Remy Card <card@masi.ibp.fr> provided patches for support for
 177                 fastboot/fasthalt. These create a /fastboot file on shutdown,
 178                 and /etc/rc may check for the existance of this file, to
 179                 optionally skip fsck.
 180
 181 example.rc      An example of an /etc/rc file. Edit it to suit your own setup.
 182
 183 ctrlaltdel -    Sets the behaviour of the Ctrl-Alt-Del combination.
 184                 "ctrlaltdel hard" makes the key-combination instantly reboot
 185                 the machine without syncing the disk or anything. This may
 186                 very well corrupt the data on the disk.
 187
 188                 "ctrlaltdel soft" makes the key-combination send a SIGINT to
 189                 the init process. Such a command would typically be in /etc/rc.
 190                 For this to make sense you must run the init from the
 191                 poeigl-1.4 package or later. The System V compatible init in
 192                 this package won't reboot the machine when it gets a SIGINT.
 193                 Linux version 0.96b-PL1 or later is also needed for this
 194                 feature to work.
 195
 196 init is gone as of V1.5, it was outdated and buggy. If you want a
 197 SYSV compatible init get the newest one from Mike Smoorenburg, called
 198 sysvinit.tar.Z
 199
 200 INSTALLATION.
 201 Simply do a
 202
 203         make
 204
 205 and then (optionally) as root:
 206
 207         make install
 208
 209
 210         - Peter (poe@daimi.aau.dk)