1 files changed, 140 insertions, 0 deletions
diff --git a/src/lib/krb5/krb/srv_dec_tkt.c b/src/lib/krb5/krb/srv_dec_tkt.c
new file mode 100644
index 000000000000..6c922523eed8
--- /dev/null
+++ b/src/lib/krb5/krb/srv_dec_tkt.c
@@ -0,0 +1,140 @@
+/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
+/* lib/krb5/krb/srv_dec_tkt.c */
+/*
+ * Copyright 2006, 2008 by the Massachusetts Institute of Technology.
+ * All Rights Reserved.
+ *
+ * Export of this software from the United States of America may
+ *   require a specific license from the United States Government.
+ *   It is the responsibility of any person or organization contemplating
+ *   export to obtain such a license before exporting.
+ *
+ * WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
+ * distribute this software and its documentation for any purpose and
+ * without fee is hereby granted, provided that the above copyright
+ * notice appear in all copies and that both that copyright notice and
+ * this permission notice appear in supporting documentation, and that
+ * the name of M.I.T. not be used in advertising or publicity pertaining
+ * to distribution of the software without specific, written prior
+ * permission.  Furthermore if you modify this software you must label
+ * your software as modified software and not distribute it in such a
+ * fashion that it might be confused with the original M.I.T. software.
+ * M.I.T. makes no representations about the suitability of
+ * this software for any purpose.  It is provided "as is" without express
+ * or implied warranty.
+ */
+
+/*
+ * Server decrypt ticket via keytab or keyblock.
+ *
+ * Different from krb5_rd_req_decoded. (krb5/src/lib/krb5/krb/rd_req_dec.c)
+ *   - No krb5_principal_compare or KRB5KRB_AP_ERR_BADMATCH error.
+ *   - No replay cache processing.
+ *   - No skew checking or KRB5KRB_AP_ERR_SKEW error.
+ *   - No address checking or KRB5KRB_AP_ERR_BADADDR error.
+ *   - No time validation.
+ *   - No permitted enctype validation or KRB5_NOPERM_ETYPE error.
+ *   - Does not free ticket->enc_part2 on error.
+ */
+
+#include <k5-int.h>
+
+#ifndef LEAN_CLIENT
+static krb5_error_code
+decrypt_ticket_keyblock(krb5_context context, const krb5_keyblock *key,
+                        krb5_ticket *ticket)
+{
+    krb5_error_code retval;
+    krb5_data *realm;
+    krb5_transited *trans;
+
+    retval = krb5_decrypt_tkt_part(context, key, ticket);
+    if (retval)
+        goto done;
+
+    trans = &ticket->enc_part2->transited;
+    realm = &ticket->enc_part2->client->realm;
+    if (trans->tr_contents.data && *trans->tr_contents.data) {
+        retval = krb5_check_transited_list(context, &trans->tr_contents,
+                                           realm, &ticket->server->realm);
+        goto done;
+    }
+
+    if (ticket->enc_part2->flags & TKT_FLG_INVALID) {   /* ie, KDC_OPT_POSTDATED */
+        retval = KRB5KRB_AP_ERR_TKT_INVALID;
+        goto done;
+    }
+
+done:
+    return retval;
+}
+
+
+krb5_error_code KRB5_CALLCONV
+krb5_server_decrypt_ticket_keytab(krb5_context context,
+                                  const krb5_keytab keytab,
+                                  krb5_ticket *ticket)
+{
+    krb5_error_code       retval;
+    krb5_keytab_entry     ktent;
+
+    if (keytab->ops->start_seq_get == NULL) {
+        retval = krb5_kt_get_entry(context, keytab,
+                                   ticket->server,
+                                   ticket->enc_part.kvno,
+                                   ticket->enc_part.enctype, &ktent);
+        if (retval == 0) {
+            retval = decrypt_ticket_keyblock(context, &ktent.key, ticket);
+
+            (void) krb5_free_keytab_entry_contents(context, &ktent);
+        }
+    } else {
+        krb5_error_code code;
+        krb5_kt_cursor cursor;
+
+        retval = krb5_kt_start_seq_get(context, keytab, &cursor);
+        if (retval != 0)
+            goto map_error;
+
+        retval = KRB5_KT_NOTFOUND;
+        while ((code = krb5_kt_next_entry(context, keytab,
+                                          &ktent, &cursor)) == 0) {
+            if (ktent.key.enctype != ticket->enc_part.enctype) {
+                (void) krb5_free_keytab_entry_contents(context, &ktent);
+                continue;
+            }
+
+            retval = decrypt_ticket_keyblock(context, &ktent.key, ticket);
+            if (retval == 0) {
+                krb5_principal tmp;
+
+                retval = krb5_copy_principal(context, ktent.principal, &tmp);
+                if (retval == 0) {
+                    krb5_free_principal(context, ticket->server);
+                    ticket->server = tmp;
+                }
+                (void) krb5_free_keytab_entry_contents(context, &ktent);
+                break;
+            }
+            (void) krb5_free_keytab_entry_contents(context, &ktent);
+        }
+
+        code = krb5_kt_end_seq_get(context, keytab, &cursor);
+        if (code != 0)
+            retval = code;
+    }
+
+map_error:
+    switch (retval) {
+    case KRB5_KT_KVNONOTFOUND:
+    case KRB5_KT_NOTFOUND:
+    case KRB5KRB_AP_ERR_BAD_INTEGRITY:
+        retval = KRB5KRB_AP_WRONG_PRINC;
+        break;
+    default:
+        break;
+    }
+
+    return retval;
+}
+#endif /* LEAN_CLIENT */