adduser-old.c: Remove program
This program has 10 calls to gets(3) according to grep(1). That
makes it a very unsafe program which should not be used at all.
Let's kill the program already.
See what gets(3) has to say:
SYNOPSIS
#include <stdio.h>
[[deprecated]] char *gets(char *s);
DESCRIPTION
Never use this function.
...
BUGS
Never use gets(). Because it is impossible to tell with‐
out knowing the data in advance how many characters
gets() will read, and because gets() will continue to
store characters past the end of the buffer, it is ex‐
tremely dangerous to use. It has been used to break com‐
puter security. Use fgets() instead.
For more information, see CWE‐242 (aka "Use of Inherently
Dangerous Function") at http://cwe.mitre.org/data/defini‐
tions/242.html
Acked-by: "Serge E. Hallyn" <serge@hallyn.com>
Signed-off-by: Alejandro Colomar <alx@kernel.org>
This commit is contained in:
Alejandro Colomar
Serge Hallyn
parent
16afe18142
commit
0336454503
@ -1,6 +1,6 @@
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# This is a dummy Makefile.am to get automake work flawlessly,
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# and also cooperate to make a distribution for `make dist'
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EXTRA_DIST = README adduser.c adduser-old.c adduser.sh adduser2.sh \
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EXTRA_DIST = README adduser.c adduser.sh adduser2.sh \
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atudel groupmems.shar pwdauth.c shadow-anonftp.patch \
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udbachk.tgz
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@ -1,300 +0,0 @@
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/****
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** 03/17/96
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** hacked a bit more, removed unused code, cleaned up for gcc -Wall.
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** --marekm
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**
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** 02/26/96
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** modified to call shadow utils (useradd,chage,passwd) on shadowed
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** systems - Cristian Gafton, gafton@sorosis.ro
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**
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** 6/27/95
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** shadow-adduser 1.4:
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**
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** now it copies the /etc/skel dir into the person's dir,
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** makes the mail folders, changed some defaults and made a 'make
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** install' just for the hell of it.
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**
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** Greg Gallagher
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** CIN.Net
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**
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** 1/28/95
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** shadow-adduser 1.3:
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**
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** Basically a bug-fix on my additions in 1.2. Thanks to Terry Stewart
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** (stew@texas.net) for pointing out one of the many idiotic bugs I introduced.
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** It was such a stupid bug that I would have never seen it myself.
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**
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** Brandon
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*****
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** 01/27/95
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**
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** shadow-adduser 1.2:
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** I took the C source from adduser-shadow (credits are below) and made
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** it a little more worthwhile. Many small changes... Here's
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** the ones I can remember:
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**
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** Removed support for non-shadowed systems (if you don't have shadow,
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** use the original adduser, don't get this shadow version!)
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** Added support for the correct /etc/shadow fields (Min days before
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** password change, max days before password change, Warning days,
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** and how many days from expiry date does the account go invalid)
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** The previous version just left all of those fields blank.
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** There is still one field left (expiry date for the account, period)
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** which I have left blank because I do not use it and didn't want to
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** spend any more time on this. I'm sure someone will put it in and
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** tack another plethora of credits on here. :)
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** Added in the password date field, which should always reflect the last
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** date the password was changed, for expiry purposes. "passwd" always
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** updates this field, so the adduser program should set it up right
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** initially (or a user could keep thier initial password forever ;)
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** The number is in days since Jan 1st, 1970.
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**
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** Have fun with it, and someone please make
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** a real version(this is still just a hack)
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** for us all to use (and Email it to me???)
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**
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** Brandon
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** photon@usis.com
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**
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*****
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** adduser 1.0: add a new user account (For systems not using shadow)
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** With a nice little interface and a will to do all the work for you.
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**
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** Craig Hagan
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** hagan@opine.cs.umass.edu
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**
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** Modified to really work, look clean, and find unused uid by Chris Cappuccio
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** chris@slinky.cs.umass.edu
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**
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*****
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**
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** 01/19/95
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**
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** FURTHER modifications to enable shadow passwd support (kludged, but
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** no more so than the original) by Dan Crowson - dcrowson@mo.net
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**
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** Search on DAN for all changes...
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**
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*****
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**
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** cc -O -o adduser adduser.c
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** Use gcc if you have it... (political reasons beyond my control) (chris)
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**
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** I've gotten this program to work with success under Linux (without
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** shadow) and SunOS 4.1.3. I would assume it should work pretty well
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** on any system that uses no shadow. (chris)
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**
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** If you have no crypt() then try
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** cc -DNO_CRYPT -O -o adduser adduser.c xfdes.c
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** I'm not sure how login operates with no crypt()... I guess
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** the same way we're doing it here.
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*/
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#include <pwd.h>
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#include <grp.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <time.h>
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#include <sys/types.h>
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#include <sys/timeb.h>
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#include <sys/time.h>
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#include <sys/stat.h>
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#define DEFAULT_SHELL "/bin/bash" /* because BASH is your friend */
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#define DEFAULT_HOME "/home"
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#define USERADD_PATH "/usr/sbin/useradd"
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#define CHAGE_PATH "/usr/sbin/chage"
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#define PASSWD_PATH "/usr/bin/passwd"
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#define DEFAULT_GROUP 100
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#define DEFAULT_MAX_PASS 60
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#define DEFAULT_WARN_PASS 10
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/* if you use this feature, you will get a lot of complaints from users
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who rarely use their accounts :) (something like 3 months would be
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more reasonable) --marekm */
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#define DEFAULT_USER_DIE /* 10 */ 0
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void main()
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{
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char foo[32];
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char uname[9],person[32],dir[32],shell[32];
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unsigned int group,min_pass,max_pass,warn_pass,user_die;
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/* the group and uid of the new user */
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int bad=0,done=0,correct=0,gets_warning=0;
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char cmd[255];
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struct group *grp;
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/* flags, in order:
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* bad to see if the username is in /etc/passwd, or if strange stuff has
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* been typed if the user might be put in group 0
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* done allows the program to exit when a user has been added
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* correct loops until a password is found that isn't in /etc/passwd
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* gets_warning allows the fflush to be skipped for the first gets
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* so that output is still legible
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*/
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/* The real program starts HERE! */
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if(geteuid()!=0)
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{
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printf("It seems you don't have access to add a new user. Try\n");
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printf("logging in as root or su root to gain super-user access.\n");
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exit(1);
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}
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/* Sanity checks
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*/
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if (!(grp=getgrgid(DEFAULT_GROUP))){
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printf("Error: the default group %d does not exist on this system!\n",
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DEFAULT_GROUP);
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printf("adduser must be recompiled.\n");
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exit(1);
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};
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while(!correct) { /* loop until a "good" uname is chosen */
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while(!done) {
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printf("\nLogin to add (^C to quit): ");
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if(gets_warning) /* if the warning was already shown */
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fflush(stdout); /* fflush stdout, otherwise set the flag */
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else
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gets_warning=1;
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gets(uname);
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if(!strlen(uname)) {
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printf("Empty input.\n");
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done=0;
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continue;
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};
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/* what I saw here before made me think maybe I was running DOS */
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/* might this be a solution? (chris) */
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if (getpwnam(uname) != NULL) {
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printf("That name is in use, choose another.\n");
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done=0;
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} else
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done=1;
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}; /* done, we have a valid new user name */
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/* all set, get the rest of the stuff */
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printf("\nEditing information for new user [%s]\n",uname);
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printf("\nFull Name [%s]: ",uname);
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gets(person);
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if (!strlen(person)) {
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bzero(person,sizeof(person));
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strcpy(person,uname);
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};
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do {
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bad=0;
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printf("GID [%d]: ",DEFAULT_GROUP);
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gets(foo);
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if (!strlen(foo))
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group=DEFAULT_GROUP;
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else
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if (isdigit (*foo)) {
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group = atoi(foo);
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if (! (grp = getgrgid (group))) {
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printf("unknown gid %s\n",foo);
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group=DEFAULT_GROUP;
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bad=1;
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};
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} else
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if ((grp = getgrnam (foo)))
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group = grp->gr_gid;
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else {
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printf("unknown group %s\n",foo);
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group=DEFAULT_GROUP;
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bad=1;
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}
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if (group==0){ /* You're not allowed to make root group users! */
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printf("Creation of root group users not allowed (must be done by hand)\n");
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group=DEFAULT_GROUP;
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bad=1;
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};
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} while(bad);
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fflush(stdin);
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printf("\nIf home dir ends with a / then [%s] will be appended to it\n",uname);
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printf("Home Directory [%s/%s]: ",DEFAULT_HOME,uname);
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fflush(stdout);
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gets(dir);
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if (!strlen(dir)) { /* hit return */
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sprintf(dir,"%s/%s",DEFAULT_HOME,uname);
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fflush(stdin);
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} else
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if (dir[strlen(dir)-1]=='/')
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sprintf(dir+strlen(dir),"%s",uname);
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printf("\nShell [%s]: ",DEFAULT_SHELL);
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fflush(stdout);
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gets(shell);
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if (!strlen(shell))
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sprintf(shell,"%s",DEFAULT_SHELL);
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printf("\nMin. Password Change Days [0]: ");
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gets(foo);
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min_pass=atoi(foo);
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printf("Max. Password Change Days [%d]: ",DEFAULT_MAX_PASS);
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gets(foo);
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if (strlen(foo) > 1)
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max_pass = atoi(foo);
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else
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max_pass = DEFAULT_MAX_PASS;
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printf("Password Warning Days [%d]: ",DEFAULT_WARN_PASS);
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gets(foo);
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warn_pass = atoi(foo);
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if (warn_pass==0)
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warn_pass = DEFAULT_WARN_PASS;
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printf("Days after Password Expiry for Account Locking [%d]: ",DEFAULT_USER_DIE);
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gets(foo);
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user_die = atoi(foo);
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if (user_die == 0)
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user_die = DEFAULT_USER_DIE;
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printf("\nInformation for new user [%s] [%s]:\n",uname,person);
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printf("Home directory: [%s] Shell: [%s]\n",dir,shell);
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printf("GID: [%d]\n",group);
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printf("MinPass: [%d] MaxPass: [%d] WarnPass: [%d] UserExpire: [%d]\n",
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min_pass,max_pass,warn_pass,user_die);
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printf("\nIs this correct? [y/N]: ");
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fflush(stdout);
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gets(foo);
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done=bad=correct=(foo[0]=='y'||foo[0]=='Y');
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if(bad!=1)
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printf("\nUser [%s] not added\n",uname);
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}
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bzero(cmd,sizeof(cmd));
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sprintf(cmd,"%s -g %d -d %s -s %s -c \"%s\" -m -k /etc/skel %s",
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USERADD_PATH,group,dir,shell,person,uname);
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printf("Calling useradd to add new user:\n%s\n",cmd);
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if(system(cmd)){
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printf("User add failed!\n");
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exit(errno);
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};
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bzero(cmd,sizeof(cmd));
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sprintf(cmd,"%s -m %d -M %d -W %d -I %d %s", CHAGE_PATH,
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min_pass,max_pass,warn_pass,user_die,uname);
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printf("%s\n",cmd);
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if(system(cmd)){
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printf("There was an error setting password expire values\n");
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exit(errno);
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};
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bzero(cmd,sizeof(cmd));
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sprintf(cmd,"%s %s",PASSWD_PATH,uname);
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system(cmd);
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printf("\nDone.\n");
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}
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