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Fix possible buffer overflow with finger and fingerd.

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Submitted by: Lukasz Luzar <lluzar@noname.kki.krakow.pl> and
	Eivind Eklund <eivind@yes.no>

This patch is actually a combination of those two patches.
This commit is contained in:
Warner Losh 1999-08-21 18:25:38 +00:00
parent fa62586ae7
commit e0d8eea175
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=50127
1 changed files with 27 additions and 16 deletions
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43
usr.bin/finger/util.c
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@ -39,7 +39,7 @@
static char sccsid[] = "@(#)util.c 8.3 (Berkeley) 4/28/95";
#else
static const char rcsid[] =
"$Id$";
"$Id: util.c,v 1.5 1997/07/02 06:34:51 charnier Exp $";
#endif
#endif /* not lint */
@ -79,7 +79,8 @@ match(pw, user)
* XXX
* Why do we skip asterisks!?!?
*/
(void)strcpy(p = tbuf, pw->pw_gecos);
(void)strncpy(p = tbuf, pw->pw_gecos, sizeof(tbuf));
p[sizeof(tbuf) - 1] = '\0';
if (*p == '*')
++p;
@ -87,13 +88,17 @@ match(pw, user)
if ((p = strtok(p, ",")) == NULL)
return(0);
for (t = name; (*t = *p) != '\0'; ++p)
if (*t == '&') {
(void)strcpy(t, pw->pw_name);
for (t = name; (*t = *p) != '\0' && t - name > sizeof(name); ++p) {
if (*t == '&') {
(void)strncpy(t, pw->pw_name,
sizeof(name) - (t - name));
name[sizeof(name) - 1] = '\0';
while (*++t);
}
else
} else {
++t;
}
}
*t = '\0';
for (t = name; (p = strtok(t, "\t ")) != NULL; t = NULL)
if (!strcasecmp(p, user))
return(1);
@ -267,7 +272,7 @@ prphone(num)
{
register char *p;
int len;
static char pbuf[15];
static char pbuf[20];
/* don't touch anything if the user has their own formatting */
for (p = num; *p; ++p)
@ -346,22 +351,27 @@ userinfo(pn, pw)
pn->shell = strdup(pw->pw_shell);
/* why do we skip asterisks!?!? */
(void)strcpy(bp = tbuf, pw->pw_gecos);
(void)strncpy(bp = tbuf, pw->pw_gecos, sizeof(tbuf));
bp[sizeof(tbuf) - 1] = '\0';
if (*bp == '*')
++bp;
/* ampersands get replaced by the login name */
if (!(p = strsep(&bp, ",")))
return;
for (t = name; (*t = *p) != '\0'; ++p)
for (t = name; (*t = *p) != '\0' && t < name + sizeof(name); ++p) {
if (*t == '&') {
(void)strcpy(t, pw->pw_name);
(void)strncpy(t, pw->pw_name,
sizeof(name) - (t - name));
name[sizeof(name) - 1] = '\0';
if (islower(*t))
*t = toupper(*t);
while (*++t);
}
else
} else {
++t;
}
}
*t = '\0';
pn->realname = strdup(name);
pn->office = ((p = strsep(&bp, ",")) && *p) ?
strdup(p) : NULL;
@ -369,7 +379,7 @@ userinfo(pn, pw)
strdup(p) : NULL;
pn->homephone = ((p = strsep(&bp, ",")) && *p) ?
strdup(p) : NULL;
(void)sprintf(tbuf,"%s/%s", _PATH_MAILDIR, pw->pw_name);
(void)snprintf(tbuf, sizeof(tbuf), "%s/%s", _PATH_MAILDIR, pw->pw_name);
pn->mailrecv = -1; /* -1 == not_valid */
if (stat(tbuf, &sb) < 0) {
if (errno != ENOENT) {
@ -396,9 +406,10 @@ hide(pw)
if (!pw->pw_dir)
return 0;
sprintf (buf, "%s/.nofinger", pw->pw_dir);
snprintf(buf, sizeof(buf), "%s/.nofinger", pw->pw_dir);
buf[sizeof(buf) - 1] = '\0';
if (access (buf, F_OK) == 0)
if (access(buf, F_OK) == 0)
return 1;
return 0;