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--- ./comsat/comsat.c.orig 2004-06-21 13:50:09.000000000 -0700
+++ ./comsat/comsat.c 2004-06-21 13:50:52.000000000 -0700
@@ -69,6 +69,8 @@
static int debug = 0;
#define dsyslog if (debug) syslog
+
+
#define MAXIDLE 120
static char hostname[MAXHOSTNAMELEN];
@@ -331,6 +333,7 @@
char line[sizeof(utp->ut_line) + 1]; /* tty name */
const char *cr; /* line delimiter */
sigset_t sigset; /* scratch signal mask */
+ struct passwd *pwbuf; /* passwd information buffer */
#ifdef USER_PROCESS
if (utp->ut_type != USER_PROCESS) {
@@ -371,6 +374,23 @@
dsyslog(LOG_DEBUG, "%s: wrong mode on %s", name, tty);
return;
}
+ /*
+ * Ensure the tty is owned by the uid of 'name' to prevent old
+ * unremoved utmp records referring to user 'x' leading to
+ * biffage of user 'x''s email to user 'y' where user 'y' is
+ * logged onto the same terminal that user 'x' previously
+ * used. T.Crane, 8th June 2004.
+ */
+ if ((pwbuf=getpwnam(name))==NULL) {
+ syslog(LOG_ERR, "get pwname(%s) failed", name);
+ exit(1);
+ }
+ if (pwbuf->pw_uid != stb.st_uid) {
+ dsyslog(LOG_DEBUG, "Warning: tty uid %d != uid %d for %s on %s\n",
+ stb.st_uid, pwbuf->pw_uid, name, tty);
+ return;
+ }
+
dsyslog(LOG_DEBUG, "notify %s on %s\n", name, tty);
/*
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