Initial import of KTH eBones. This has been cleaned up to only include

the "core" Kerberos functionality. The rest of the userland will get their
own changes later.

1 files changed, 178 insertions, 0 deletions

diff --git a/crypto/kerberosIV/lib/krb/rd_safe.c b/crypto/kerberosIV/lib/krb/rd_safe.c
new file mode 100644
index 0000000..8471df0
--- /dev/null
+++ b/crypto/kerberosIV/lib/krb/rd_safe.c
@@ -0,0 +1,178 @@
+/*
+ * 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_safe.c,v 1.24 1997/04/19 23:18:20 joda Exp $");
+
+/* application include files */
+#include "lsb_addr_comp.h"
+
+/* Generate two checksums in the given byteorder of the data, one
+ * new-form and one old-form. It has to be done this way to be
+ * compatible with the old version of des_quad_cksum.
+ */
+
+/* des_quad_chsum-type; 0 == unknown, 1 == new PL10++, 2 == old */
+int dqc_type = DES_QUAD_DEFAULT;
+
+void
+fixup_quad_cksum(void *start, size_t len, des_cblock *key, 
+		 void *new_checksum, void *old_checksum, int little)
+{
+    des_quad_cksum((des_cblock*)start, (des_cblock*)new_checksum, len, 2, key);
+    if(HOST_BYTE_ORDER){
+	if(little){
+	    memcpy(old_checksum, new_checksum, 16);
+	}else{
+	    u_int32_t *tmp = (u_int32_t*)new_checksum;
+	    memcpy(old_checksum, new_checksum, 16);
+	    swap_u_16(old_checksum);
+	    swap_u_long(tmp[0]);
+	    swap_u_long(tmp[1]);
+	    swap_u_long(tmp[2]);
+	    swap_u_long(tmp[3]);
+	}
+    }else{
+	if(little){
+	    u_int32_t *tmp = (u_int32_t*)new_checksum;
+	    swap_u_long(tmp[0]);
+	    swap_u_long(tmp[1]);
+	    swap_u_long(tmp[2]);
+	    swap_u_long(tmp[3]);
+	    memcpy(old_checksum, new_checksum, 16);
+	}else{
+	    u_int32_t tmp[4];
+	    tmp[0] = ((u_int32_t*)new_checksum)[3];
+	    tmp[1] = ((u_int32_t*)new_checksum)[2];
+	    tmp[2] = ((u_int32_t*)new_checksum)[1];
+	    tmp[3] = ((u_int32_t*)new_checksum)[0];
+	    memcpy(old_checksum, tmp, 16);
+	}
+    }
+}
+
+/*
+ * krb_rd_safe() checks the integrity of an AUTH_MSG_SAFE message.
+ * Given the message received, "in", the length of that message,
+ * "in_length", the "key" to compute the checksum with, and the
+ * network addresses of the "sender" and "receiver" of the message,
+ * krb_rd_safe() returns RD_AP_OK if message is okay, otherwise
+ * some error code.
+ *
+ * The message data retrieved from "in" is 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_safe.c" for the format of the AUTH_MSG_SAFE
+ * message.  The structure containing the extracted message
+ * information, MSG_DAT, is defined in "krb.h".
+ */
+
+int32_t
+krb_rd_safe(void *in, u_int32_t in_length, des_cblock *key, 
+	    struct sockaddr_in *sender, struct sockaddr_in *receiver, 
+	    MSG_DAT *m_data)
+{
+    unsigned char *p = (unsigned char*)in, *start;
+
+    unsigned char pvno, type;
+    int little_endian;
+    struct timeval tv;
+    u_int32_t src_addr;
+    int delta_t;
+    
+
+    pvno = *p++;
+    if(pvno != KRB_PROT_VERSION)
+	return RD_AP_VERSION;
+    
+    type = *p++;
+    little_endian = type & 1;
+    type &= ~1;
+    if(type != AUTH_MSG_SAFE)
+	return RD_AP_MSG_TYPE;
+
+    start = p;
+    
+    p += krb_get_int(p, &m_data->app_length, 4, little_endian);
+    
+    if(m_data->app_length + 31 > 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);
+
+    delta_t = abs((int)((long) tv.tv_sec - m_data->time_sec));
+    if (delta_t > CLOCK_SKEW) return RD_AP_TIME;
+
+    /*
+     * 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.
+     */
+
+    {
+	unsigned char new_checksum[16];
+	unsigned char old_checksum[16];
+	fixup_quad_cksum(start, p - start, key, 
+			 new_checksum, old_checksum, little_endian);
+	if((dqc_type == DES_QUAD_GUESS || dqc_type == DES_QUAD_NEW) && 
+	   memcmp(new_checksum, p, 16) == 0)
+	    dqc_type = DES_QUAD_NEW;
+	else if((dqc_type == DES_QUAD_GUESS || dqc_type == DES_QUAD_OLD) && 
+		memcmp(old_checksum, p, 16) == 0)
+	    dqc_type = DES_QUAD_OLD;
+	else
+	    return RD_AP_MODIFIED;
+    }
+    return KSUCCESS;
+}