Fix failure interval of 0 in LDAP lockout code

A failure count interval of 0 caused krb5_ldap_lockout_check_policy to
pass the lockout check (but didn't cause a reset of the failure count
in krb5_ldap_lockout_audit).  It should be treated as forever, as in
the DB2 back end.

This bug is the previously unknown cause of the assertion failure
fixed in CVE-2011-1528.

ticket: 7021
target_version: 1.10
tags: pullup

git-svn-id: svn://anonsvn.mit.edu/krb5/trunk@25480 dc483132-0cff-0310-8789-dd5450dbe970

diff --git a/src/kadmin/cli/kadmin.M b/src/kadmin/cli/kadmin.M
index 9599bbf89e1bfab187c471c708b26b2b65bc7921..b05007a53cd5a2c198d4bcc3e473de668c19ed1c 100644 (file)
--- a/src/kadmin/cli/kadmin.M
+++ b/src/kadmin/cli/kadmin.M
@@ -726,12 +726,13 @@ principals which require preauthentication.
 sets the allowable time between authentication failures.  If an
 authentication failure happens after \fIfailuretime\fP has elapsed
 since the previous failure, the number of authentication failures is
-reset to 1.
+reset to 1.  A failure count interval of 0 means forever.
 .TP
 \fB\-lockoutduration\fP \fIlockouttime\fP
 sets the duration for which the principal is locked from
 authenticating if too many authentication failures occur without the
-specified failure count interval elapsing.
+specified failure count interval elapsing.  A duration of 0 means
+forever.
 .sp
 .nf
 .TP

diff --git a/src/plugins/kdb/ldap/libkdb_ldap/lockout.c b/src/plugins/kdb/ldap/libkdb_ldap/lockout.c
index 36505f83207fd2f48dbd80c26ea106db212fffdf..83d79e098ab3c787c9bc8ebe992486c1aa6d420a 100644 (file)
--- a/src/plugins/kdb/ldap/libkdb_ldap/lockout.c
+++ b/src/plugins/kdb/ldap/libkdb_ldap/lockout.c
@@ -127,7 +127,7 @@ krb5_ldap_lockout_check_policy(krb5_context context,
     code = lookup_lockout_policy(context, entry, &max_fail,
                                  &failcnt_interval,
                                  &lockout_duration);
-    if (code != 0 || failcnt_interval == 0)
+    if (code != 0)
         return code;
 
     if (locked_check_p(context, stamp, max_fail, lockout_duration, entry))