1 files changed, 129 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/rd_priv.c b/crypto/kerberosIV/lib/krb/rd_priv.c
new file mode 100644
index 0000000..58ecd9f
--- /dev/null
+++ b/crypto/kerberosIV/lib/krb/rd_priv.c
@@ -0,0 +1,129 @@
+/*
+ * Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
+ * (Royal Institute of Technology, Stockholm, Sweden).
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *      This product includes software developed by the Kungliga Tekniska
+ *      Högskolan and its contributors.
+ * 
+ * 4. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include "krb_locl.h"
+
+RCSID("$Id: rd_priv.c,v 1.24 1997/05/14 17:53:29 joda Exp $");
+
+/* application include files */
+#include "lsb_addr_comp.h"
+
+/*
+ * krb_rd_priv() decrypts and checks the integrity of an
+ * AUTH_MSG_PRIVATE message.  Given the message received, "in",
+ * the length of that message, "in_length", the key "schedule"
+ * and "key", and the network addresses of the
+ * "sender" and "receiver" of the message, krb_rd_safe() returns
+ * RD_AP_OK if the message is okay, otherwise some error code.
+ *
+ * The message data retrieved from "in" are returned in the structure
+ * "m_data".  The pointer to the application data
+ * (m_data->app_data) refers back to the appropriate place in "in".
+ *
+ * See the file "mk_priv.c" for the format of the AUTH_MSG_PRIVATE
+ * message.  The structure containing the extracted message
+ * information, MSG_DAT, is defined in "krb.h".
+ */
+
+int32_t
+krb_rd_priv(void *in, u_int32_t in_length, 
+	    struct des_ks_struct *schedule, des_cblock *key, 
+	    struct sockaddr_in *sender, struct sockaddr_in *receiver, 
+	    MSG_DAT *m_data)
+{
+    unsigned char *p = (unsigned char*)in;
+    int little_endian;
+    u_int32_t clen;
+    struct timeval tv;
+    u_int32_t src_addr;
+    int delta_t;
+
+    unsigned char pvno, type;
+
+    pvno = *p++;
+    if(pvno != KRB_PROT_VERSION)
+	return RD_AP_VERSION;
+    
+    type = *p++;
+    little_endian = type & 1;
+    type &= ~1;
+
+    p += krb_get_int(p, &clen, 4, little_endian);
+    
+    if(clen + 2 > in_length)
+	return RD_AP_MODIFIED;
+
+    des_pcbc_encrypt((des_cblock*)p, (des_cblock*)p, clen, 
+		     schedule, key, DES_DECRYPT);
+    
+    p += krb_get_int(p, &m_data->app_length, 4, little_endian);
+    if(m_data->app_length + 17 > in_length)
+	return RD_AP_MODIFIED;
+
+    m_data->app_data = p;
+    p += m_data->app_length;
+    
+    m_data->time_5ms = *p++;
+
+    p += krb_get_address(p, &src_addr);
+
+    if (!krb_equiv(src_addr, sender->sin_addr.s_addr))
+	return RD_AP_BADD;
+
+    p += krb_get_int(p, (u_int32_t *)&m_data->time_sec, 4, little_endian);
+
+    m_data->time_sec = lsb_time(m_data->time_sec, sender, receiver);
+    
+    gettimeofday(&tv, NULL);
+
+    /* check the time integrity of the msg */
+    delta_t = abs((int)((long) tv.tv_sec - m_data->time_sec));
+    if (delta_t > CLOCK_SKEW)
+	return RD_AP_TIME;
+    if (krb_debug)
+      krb_warning("\ndelta_t = %d", (int) delta_t);
+
+    /*
+     * caller must check timestamps for proper order and
+     * replays, since server might have multiple clients
+     * each with its own timestamps and we don't assume
+     * tightly synchronized clocks.
+     */
+
+    return KSUCCESS;
+}