159 lines
4.4 KiB
C
159 lines
4.4 KiB
C
/* insecure.c: The opieinsecure() library function.
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%%% portions-copyright-cmetz-96
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Portions of this software are Copyright 1996-1997 by Craig Metz, All Rights
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Reserved. The Inner Net License Version 2 applies to these portions of
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the software.
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You should have received a copy of the license with this software. If
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you didn't get a copy, you may request one from <license@inner.net>.
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Portions of this software are Copyright 1995 by Randall Atkinson and Dan
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McDonald, All Rights Reserved. All Rights under this copyright are assigned
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to the U.S. Naval Research Laboratory (NRL). The NRL Copyright Notice and
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License Agreement applies to this software.
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History:
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Modified by cmetz for OPIE 2.31. Fixed a logic bug. Call endut[x]ent().
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Modified by cmetz for OPIE 2.3. Added result caching. Use
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__opiegetutmpentry(). Ifdef around ut_host check. Eliminate
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unused variable.
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Modified by cmetz for OPIE 2.2. Use FUNCTION declaration et al.
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Allow IP loopback. DISPLAY and ut_host must match exactly,
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not just the part before the colon. Added work-around for
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Sun CDE dtterm bug. Leave the environment as it was
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found. Use uname().
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Created at NRL for OPIE 2.2 from opiesubr.c. Fixed pointer
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assignment that should have been a comparison.
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*/
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#include "opie_cfg.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h> /* ANSI C standard library */
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#include <sys/param.h>
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#include <unistd.h>
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#include <utmp.h>
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#if DOUTMPX
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#include <utmpx.h>
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#define utmp utmpx
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#define endutent endutxent
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#endif /* DOUTMPX */
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#if HAVE_SYS_UTSNAME_H
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#include <sys/utsname.h>
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#endif /* HAVE_SYS_UTSNAME_H */
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#include "opie.h"
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char *remote_terms[] = { "xterm", "xterms", "kterm", NULL };
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int opieinsecure FUNCTION_NOARGS
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{
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#ifndef NO_INSECURE_CHECK
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char *display_name;
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char *s;
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char *term_name;
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int insecure = 0;
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#if HAVE_UT_HOST
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struct utmp utmp;
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#endif /* HAVE_UT_HOST */
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static int result = -1;
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if (result != -1)
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return result;
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display_name = (char *) getenv("DISPLAY");
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term_name = (char *) getenv("TERM");
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if (display_name) {
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insecure = 1;
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if (s = strchr(display_name, ':')) {
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int n = s - display_name;
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if (!n)
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insecure = 0;
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else {
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if (!strncmp("unix", display_name, n))
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insecure = 0;
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else if (!strncmp("localhost", display_name, n))
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insecure = 0;
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else if (!strncmp("loopback", display_name, n))
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insecure = 0;
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else if (!strncmp("127.0.0.1", display_name, n))
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insecure = 0;
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else {
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struct utsname utsname;
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if (!uname(&utsname)) {
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if (!strncmp(utsname.nodename, display_name, n))
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insecure = 0;
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else {
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if (s = strchr(display_name, '.')) {
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int n2 = s - display_name;
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if (n < n2)
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n2 = n;
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if (!strncmp(utsname.nodename, display_name, n2))
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insecure = 0;
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} /* endif display_name is '.' */
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} /* endif hostname != display_name */
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} /* endif was able to get hostname */
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} /* endif display_name == UNIX */
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}
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}
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} /* endif display_name == ":" */
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if (insecure)
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return (result = 1);
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/* If no DISPLAY variable exists and TERM=xterm,
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then we probably have an xterm executing on a remote system
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with an rlogin or telnet to our system. If it were a local
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xterm, then the DISPLAY environment variable would
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have to exist. rja */
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if (!display_name && term_name) {
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int i;
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for (i = 0; remote_terms[i]; i++)
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if (!strcmp(term_name, remote_terms[i]))
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return (result = 1);
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};
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#if HAVE_UT_HOST
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memset(&utmp, 0, sizeof(struct utmp));
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{
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int i = __opiegetutmpentry(ttyname(0), &utmp);
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endutent();
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if (!i && utmp.ut_host[0]) {
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insecure = 1;
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if (s = strchr(utmp.ut_host, ':')) {
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int n = s - utmp.ut_host;
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if (!n)
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insecure = 0;
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else
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if (display_name) {
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if (!strncmp(utmp.ut_host, display_name, n))
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insecure = 0;
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#ifdef SOLARIS
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else
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if (s = strchr(utmp.ut_host, ' ')) {
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*s = ':';
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if (s = strchr(s + 1, ' '))
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*s = '.';
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if (!strncmp(utmp.ut_host, display_name, n))
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insecure = 0;
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}
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#endif /* SOLARIS */
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}
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}
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}
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};
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#endif /* HAVE_UT_HOST */
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if (insecure)
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return (result = 1);
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return (result = 0);
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#else /* NO_INSECURE_CHECK */
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return 0;
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#endif /* NO_INSECURE_CHECK */
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}
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