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/* insecure.c: The opieinsecure() library function.
%%% portions-copyright-cmetz-96
Portions of this software are Copyright 1996-1999 by Craig Metz, All Rights
Reserved. The Inner Net License Version 2 applies to these portions of
the software.
You should have received a copy of the license with this software. If
you didn't get a copy, you may request one from <license@inner.net>.
Portions of this software are Copyright 1995 by Randall Atkinson and Dan
McDonald, All Rights Reserved. All Rights under this copyright are assigned
to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
License Agreement applies to this software.
History:
Modified by cmetz for OPIE 2.4. Do utmp checks on utmpx systems.
Handle unterminated ut_host.
Modified by cmetz for OPIE 2.31. Fixed a logic bug. Call endut[x]ent().
Modified by cmetz for OPIE 2.3. Added result caching. Use
__opiegetutmpentry(). Ifdef around ut_host check. Eliminate
unused variable.
Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al.
Allow IP loopback. DISPLAY and ut_host must match exactly,
not just the part before the colon. Added work-around for
Sun CDE dtterm bug. Leave the environment as it was
found. Use uname().
Created at NRL for OPIE 2.2 from opiesubr.c. Fixed pointer
assignment that should have been a comparison.
*/
#include "opie_cfg.h"
#include <stdio.h>
#include <string.h>
#include <stdlib.h> /* ANSI C standard library */
#include <sys/param.h>
#include <unistd.h>
#include <utmp.h>
#if DOUTMPX
#include <utmpx.h>
#define utmp utmpx
#define endutent endutxent
#endif /* DOUTMPX */
#if HAVE_SYS_UTSNAME_H
#include <sys/utsname.h>
#endif /* HAVE_SYS_UTSNAME_H */
#include "opie.h"
char *remote_terms[] = { "xterm", "xterms", "kterm", NULL };
int opieinsecure FUNCTION_NOARGS
{
#ifndef NO_INSECURE_CHECK
char *display_name;
char *s;
char *term_name;
int insecure = 0;
#if HAVE_UT_HOST || DOUTMPX
struct utmp utmp;
#endif /* HAVE_UT_HOST || DOUTMPX */
static int result = -1;
if (result != -1)
return result;
display_name = (char *) getenv("DISPLAY");
term_name = (char *) getenv("TERM");
if (display_name) {
insecure = 1;
if (s = strchr(display_name, ':')) {
int n = s - display_name;
if (!n)
insecure = 0;
else {
if (!strncmp("unix", display_name, n))
insecure = 0;
else if (!strncmp("localhost", display_name, n))
insecure = 0;
else if (!strncmp("loopback", display_name, n))
insecure = 0;
else if (!strncmp("127.0.0.1", display_name, n))
insecure = 0;
else {
struct utsname utsname;
if (!uname(&utsname)) {
if (!strncmp(utsname.nodename, display_name, n))
insecure = 0;
else {
if (s = strchr(display_name, '.')) {
int n2 = s - display_name;
if (n < n2)
n2 = n;
if (!strncmp(utsname.nodename, display_name, n2))
insecure = 0;
} /* endif display_name is '.' */
} /* endif hostname != display_name */
} /* endif was able to get hostname */
} /* endif display_name == UNIX */
}
}
} /* endif display_name == ":" */
if (insecure)
return (result = 1);
/* If no DISPLAY variable exists and TERM=xterm,
then we probably have an xterm executing on a remote system
with an rlogin or telnet to our system. If it were a local
xterm, then the DISPLAY environment variable would
have to exist. rja */
if (!display_name && term_name) {
int i;
for (i = 0; remote_terms[i]; i++)
if (!strcmp(term_name, remote_terms[i]))
return (result = 1);
};
#if HAVE_UT_HOST || DOUTMPX
if (isatty(0)) {
memset(&utmp, 0, sizeof(struct utmp));
{
int i = __opiegetutmpentry(ttyname(0), &utmp);
endutent();
if (!i && utmp.ut_host[0]) {
char host[sizeof(utmp.ut_host) + 1];
insecure = 1;
strncpy(host, utmp.ut_host, sizeof(utmp.ut_host));
host[sizeof(utmp.ut_host)] = 0;
if (s = strchr(host, ':')) {
int n = s - host;
if (!n)
insecure = 0;
else
if (display_name) {
if (!strncmp(host, display_name, n))
insecure = 0;
#if 1 /* def SOLARIS */
else
if (s = strchr(host, ' ')) {
*s = ':';
if (s = strchr(s + 1, ' '))
*s = '.';
if (!strncmp(host, display_name, n))
insecure = 0;
}
#endif /* SOLARIS */
}
}
}
};
};
#endif /* HAVE_UT_HOST || DOUTMPX */
if (insecure)
return (result = 1);
return (result = 0);
#else /* NO_INSECURE_CHECK */
return 0;
#endif /* NO_INSECURE_CHECK */
}
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