1 files changed, 131 insertions, 0 deletions
diff --git a/crypto/kerberosIV/lib/krb/mk_safe.c b/crypto/kerberosIV/lib/krb/mk_safe.c
new file mode 100644
index 0000000..df5ca21
--- /dev/null
+++ b/crypto/kerberosIV/lib/krb/mk_safe.c
@@ -0,0 +1,131 @@
+/*
+ * 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: mk_safe.c,v 1.21 1997/04/19 23:18:03 joda Exp $");
+
+/* application include files */
+#include "lsb_addr_comp.h"
+
+
+/* from rd_safe.c */
+extern int dqc_type;
+void fixup_quad_cksum(void*, size_t, des_cblock*, void*, void*, int);
+
+/*
+ * krb_mk_safe() constructs an AUTH_MSG_SAFE message.  It takes some
+ * user data "in" of "length" bytes and creates a packet in "out"
+ * consisting of the user data, a timestamp, and the sender's network
+ * address, followed by a checksum computed on the above, using the
+ * given "key".  The length of the resulting packet is returned.
+ *
+ * The "out" packet consists of:
+ *
+ * Size			Variable		Field
+ * ----			--------		-----
+ *
+ * 1 byte		KRB_PROT_VERSION	protocol version number
+ * 1 byte		AUTH_MSG_SAFE |		message type plus local
+ *			HOST_BYTE_ORDER		byte order in low bit
+ *
+ * ===================== begin checksum ================================
+ * 
+ * 4 bytes		length			length of user data
+ * length		in			user data
+ * 1 byte		msg_time_5ms		timestamp milliseconds
+ * 4 bytes		sender->sin.addr.s_addr	sender's IP address
+ *
+ * 4 bytes		msg_time_sec or		timestamp seconds with
+ *			-msg_time_sec		direction in sign bit
+ *
+ * ======================= end checksum ================================
+ *
+ * 16 bytes		big_cksum		quadratic checksum of
+ *						above using "key"
+ */
+
+int32_t
+krb_mk_safe(void *in, void *out, u_int32_t length, des_cblock *key, 
+	    struct sockaddr_in *sender, struct sockaddr_in *receiver)
+{
+    unsigned char * p = (unsigned char*)out;
+    struct timeval tv;
+    unsigned char *start;
+    u_int32_t src_addr;
+
+    p += krb_put_int(KRB_PROT_VERSION, p, 1);
+    p += krb_put_int(AUTH_MSG_SAFE, p, 1);
+    
+    start = p;
+
+    p += krb_put_int(length, p, 4);
+
+    memcpy(p, in, length);
+    p += length;
+    
+    gettimeofday(&tv, NULL);
+
+    *p++ = tv.tv_usec/5000; /* 5ms */
+    
+    src_addr = sender->sin_addr.s_addr;
+    p += krb_put_address(src_addr, p);
+
+    p += krb_put_int(lsb_time(tv.tv_sec, sender, receiver), p, 4);
+
+    {
+	/* We are faking big endian mode, so we need to fix the
+	 * checksum (that is byte order dependent). We always send a
+	 * checksum of the new type, unless we know that we are
+	 * talking to an old client (this requires a call to
+	 * krb_rd_safe first).  
+	 */
+	unsigned char new_checksum[16];
+	unsigned char old_checksum[16];
+	fixup_quad_cksum(start, p - start, key, new_checksum, old_checksum, 0);
+	
+	if((dqc_type == DES_QUAD_GUESS && DES_QUAD_DEFAULT == DES_QUAD_OLD) || 
+	   dqc_type == DES_QUAD_OLD)
+	    memcpy(p, old_checksum, 16);
+	else
+	    memcpy(p, new_checksum, 16);
+    }
+    p += 16;
+
+    return p - (unsigned char*)out;
+}