1 files changed, 128 insertions, 0 deletions
diff --git a/src/rgw/rgw_ldap.cc b/src/rgw/rgw_ldap.cc
new file mode 100644
index 000000000..27b2c24af
--- /dev/null
+++ b/src/rgw/rgw_ldap.cc
@@ -0,0 +1,128 @@
+// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
+// vim: ts=8 sw=2 smarttab ft=cpp
+
+#include "rgw_ldap.h"
+
+#include "common/ceph_crypto.h"
+#include "common/ceph_context.h"
+#include "common/common_init.h"
+#include "common/dout.h"
+#include "common/safe_io.h"
+#include <boost/algorithm/string.hpp>
+
+#include "include/ceph_assert.h"
+
+#define dout_subsys ceph_subsys_rgw
+
+std::string parse_rgw_ldap_bindpw(CephContext* ctx)
+{
+  string ldap_bindpw;
+  string ldap_secret = ctx->_conf->rgw_ldap_secret;
+
+  if (ldap_secret.empty()) {
+    ldout(ctx, 10)
+      << __func__ << " LDAP auth no rgw_ldap_secret file found in conf"
+      << dendl;
+    } else {
+      // FIPS zeroization audit 20191116: this memset is not intended to
+      // wipe out a secret after use.
+      char bindpw[1024];
+      memset(bindpw, 0, 1024);
+      int pwlen = safe_read_file("" /* base */, ldap_secret.c_str(),
+				 bindpw, 1023);
+      if (pwlen > 0) {
+        ldap_bindpw = bindpw;
+        boost::algorithm::trim(ldap_bindpw);
+        if (ldap_bindpw.back() == '\n')
+          ldap_bindpw.pop_back();
+      }
+      ::ceph::crypto::zeroize_for_security(bindpw, sizeof(bindpw));
+  }
+
+  return ldap_bindpw;
+}
+
+#if defined(HAVE_OPENLDAP)
+namespace rgw {
+
+  int LDAPHelper::auth(const std::string &uid, const std::string &pwd) {
+    int ret;
+    std::string filter;
+    if (msad) {
+      filter = "(&(objectClass=user)(sAMAccountName=";
+      filter += uid;
+      filter += "))";
+    } else {
+      /* openldap */
+      if (searchfilter.empty()) {
+        /* no search filter provided in config, we construct our own */
+        filter = "(";
+        filter += dnattr;
+        filter += "=";
+        filter += uid;
+        filter += ")";
+      } else {
+        if (searchfilter.find("@USERNAME@") != std::string::npos) {
+        /* we need to substitute the @USERNAME@ placeholder */
+	  filter = searchfilter;
+          filter.replace(searchfilter.find("@USERNAME@"), std::string("@USERNAME@").length(), uid);
+        } else {
+        /* no placeholder for username, so we need to append our own username filter to the custom searchfilter */
+          filter = "(&(";
+          filter += searchfilter;
+          filter += ")(";
+          filter += dnattr;
+          filter += "=";
+          filter += uid;
+          filter += "))";
+        }
+      }
+    }
+    ldout(g_ceph_context, 12)
+      << __func__ << " search filter: " << filter
+      << dendl;
+    char *attrs[] = { const_cast<char*>(dnattr.c_str()), nullptr };
+    LDAPMessage *answer = nullptr, *entry = nullptr;
+    bool once = true;
+
+    lock_guard guard(mtx);
+
+  retry_bind:
+    ret = ldap_search_s(ldap, searchdn.c_str(), LDAP_SCOPE_SUBTREE,
+			filter.c_str(), attrs, 0, &answer);
+    if (ret == LDAP_SUCCESS) {
+      entry = ldap_first_entry(ldap, answer);
+      if (entry) {
+	char *dn = ldap_get_dn(ldap, entry);
+	ret = simple_bind(dn, pwd);
+	if (ret != LDAP_SUCCESS) {
+	  ldout(g_ceph_context, 10)
+	    << __func__ << " simple_bind failed uid=" << uid
+	    << "ldap err=" << ret
+	    << dendl;
+	}
+	ldap_memfree(dn);
+      } else {
+	ldout(g_ceph_context, 12)
+	  << __func__ << " ldap_search_s no user matching uid=" << uid
+	  << dendl;
+	ret = LDAP_NO_SUCH_ATTRIBUTE; // fixup result
+      }
+      ldap_msgfree(answer);
+    } else {
+      ldout(g_ceph_context, 5)
+	<< __func__ << " ldap_search_s error uid=" << uid
+	<< " ldap err=" << ret
+	<< dendl;
+      /* search should never fail--try to rebind */
+      if (once) {
+	rebind();
+	once = false;
+	goto retry_bind;
+      }
+    }
+    return (ret == LDAP_SUCCESS) ? ret : -EACCES;
+  } /* LDAPHelper::auth */
+}
+
+#endif /* defined(HAVE_OPENLDAP) */