This commit was generated by cvs2svn to compensate for changes in r26234,

which included commits to RCS files with non-trunk default branches.

1 files changed, 264 insertions, 0 deletions

diff --git a/usr.sbin/keyserv/crypt_server.c b/usr.sbin/keyserv/crypt_server.c
new file mode 100644
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+++ b/usr.sbin/keyserv/crypt_server.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 1996
+ *	Bill Paul <wpaul@ctr.columbia.edu>.  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 Bill Paul.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY Bill Paul 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 Bill Paul 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.
+ *
+ *	$Id: crypt_server.c,v 1.15 1996/12/25 19:21:10 wpaul Exp $
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/param.h>
+#include <stdlib.h>
+#include <dirent.h>
+#include <err.h>
+#include <rpc/des_crypt.h>
+#include <rpc/des.h>
+#include <string.h>
+#include <dlfcn.h>
+#include "crypt.h"
+
+#ifndef lint
+static const char rcsid[] = "$Id: crypt_server.c,v 1.15 1996/12/25 19:21:10 wpaul Exp $";
+#endif
+
+/*
+ * The U.S. government stupidly believes that a) it can keep strong
+ * crypto code a secret and b) that doing so somehow protects national
+ * interests. It's wrong on both counts, but until it listens to reason
+ * we have to make certain compromises so it doesn't have an excuse to
+ * throw us in federal prison.
+ *
+ * Consequently, the core OS ships without DES support, and keyserv
+ * defaults to using RC4 with only a 40 bit key, just like nutscrape.
+ * This breaks compatibility with Secure RPC on other systems, but it
+ * allows Secure RPC to work between FreeBSD systems that don't have the
+ * DES package installed without throwing security totally out the window.
+ *
+ * In order to avoid having to supply two versions of keyserv (one with
+ * DES and one without), we use dlopen() and friends to load libdes.so
+ * into our address space at runtime. We check for the presence of
+ * /usr/lib/libdes.so.3.0 at startup and load it if we find it. If we
+ * can't find it, or the __des_crypt symbol doesn't exist, we fall back
+ * to the RC4 encryption code. The user can specify another path using
+ * the -p flag.
+ */
+
+ /* rc4.h */
+typedef struct rc4_key
+{      
+   unsigned char state[256];       
+   unsigned char x;        
+   unsigned char y;
+} rc4_key;
+
+static void prepare_key(unsigned char *key_data_ptr,int key_data_len,
+		 rc4_key *key);
+static void rc4(unsigned char *buffer_ptr,int buffer_len,rc4_key * key);
+static void swap_byte(unsigned char *a, unsigned char *b);
+
+static void prepare_key(unsigned char *key_data_ptr, int key_data_len,
+		 rc4_key *key)
+{
+   unsigned char index1;
+   unsigned char index2;
+   unsigned char* state;
+   short counter;     
+
+   state = &key->state[0];         
+   for(counter = 0; counter < 256; counter++)              
+   state[counter] = counter;               
+   key->x = 0;     
+   key->y = 0;     
+   index1 = 0;     
+   index2 = 0;             
+   for(counter = 0; counter < 256; counter++)      
+   {               
+      index2 = (key_data_ptr[index1] + state[counter] +
+                index2) % 256;                
+      swap_byte(&state[counter], &state[index2]);            
+      
+      index1 = (index1 + 1) % key_data_len;  
+   }       
+}
+
+static void rc4(unsigned char *buffer_ptr, int buffer_len, rc4_key *key)
+{ 
+   unsigned char x;
+   unsigned char y;
+   unsigned char* state;
+   unsigned char xorIndex;
+   short counter;              
+   
+   x = key->x;     
+   y = key->y;     
+   
+   state = &key->state[0];         
+   for(counter = 0; counter < buffer_len; counter ++)      
+   {               
+      x = (x + 1) % 256;                      
+      y = (state[x] + y) % 256;               
+      swap_byte(&state[x], &state[y]);                        
+      
+      xorIndex = (state[x] + state[y]) % 256;                 
+      
+      buffer_ptr[counter] ^= state[xorIndex];         
+   }               
+   key->x = x;     
+   key->y = y;
+}
+
+static void swap_byte(unsigned char *a, unsigned char *b)
+{
+   unsigned char swapByte; 
+   
+   swapByte = *a; 
+   *a = *b;      
+   *b = swapByte;
+}
+
+/* Dummy _des_crypt function that uses RC4 with a 40 bit key */
+int _rc4_crypt(buf, len, desp)
+	char *buf;
+	int len;
+	struct desparams *desp;
+{
+	struct rc4_key rc4k;
+
+	/*
+	 * U.S. government anti-crypto weasels take
+	 * note: although we are supplied with a 64 bit
+	 * key, we're only passing 40 bits to the RC4
+	 * encryption code. So there.
+	 */
+	prepare_key(desp->des_key, 5, &rc4k);
+	rc4(buf, len, &rc4k);
+
+	return(DESERR_NOHWDEVICE);
+}
+
+int (*_my_crypt)__P((char *, int, struct desparams *)) = NULL;
+
+static void *dlhandle;
+
+#ifndef _PATH_USRLIB
+#define _PATH_USRLIB "/usr/lib"
+#endif
+
+#ifndef LIBDES
+#define LIBDES "libdes.so.3."
+#endif
+
+void load_des(warn, libpath)
+	int warn;
+	char *libpath;
+{
+	DIR *dird;
+	struct dirent *dirp;
+	char dlpath[MAXPATHLEN];
+	int minor = -1;
+	int len;
+
+	if (libpath == NULL) {
+		len = strlen(LIBDES);
+		if ((dird = opendir(_PATH_USRLIB)) == NULL)
+			err(1, "opendir(/usr/lib) failed");
+
+		while ((dirp = readdir(dird)) != NULL) {
+			/* must have a minor number */
+			if (strlen(dirp->d_name) <= len)
+				continue;
+			if (!strncmp(dirp->d_name, LIBDES, len)) {
+				if (atoi((dirp->d_name + len + 1)) > minor) {
+					minor = atoi((dirp->d_name + len + 1));
+					snprintf(dlpath,sizeof(dlpath),"%s/%s",
+						_PATH_USRLIB, dirp->d_name);
+				}
+			}
+		}
+
+		closedir(dird);
+	} else
+		snprintf(dlpath, sizeof(dlpath), "%s", libpath);
+
+	if (dlpath != NULL && (dlhandle = dlopen(dlpath, 0444)) != NULL)
+		_my_crypt = (int (*)())dlsym(dlhandle, "__des_crypt");
+
+	if (_my_crypt == NULL) {
+		if (dlhandle != NULL)
+			dlclose(dlhandle);
+		_my_crypt = &_rc4_crypt;
+		if (warn) {
+			printf ("DES support disabled -- using RC4 instead.\n");
+			printf ("Warning: RC4 cipher is not compatible with ");
+			printf ("other Secure RPC implementations.\nInstall ");
+			printf ("the FreeBSD 'des' distribution to enable");
+			printf (" DES encryption.\n");
+		}
+	} else {
+		if (warn) {
+			printf ("DES support enabled\n");
+			printf ("Using %s shared object.\n", dlpath);
+		}
+	}
+
+	return;
+}
+
+desresp *
+des_crypt_1_svc(desargs *argp, struct svc_req *rqstp)
+{
+	static desresp  result;
+	struct desparams dparm;
+
+	if (argp->desbuf.desbuf_len > DES_MAXDATA) {
+		result.stat = DESERR_BADPARAM;
+		return(&result);
+	}
+
+	bcopy(argp->des_key, dparm.des_key, 8);
+	bcopy(argp->des_ivec, dparm.des_ivec, 8);
+	dparm.des_mode = argp->des_mode;
+	dparm.des_dir = argp->des_dir;
+
+#ifdef BROKEN_DES
+	dparm.UDES.UDES_buf = argp->desbuf.desbuf_val;
+#endif
+	result.stat = _my_crypt(argp->desbuf.desbuf_val,
+				argp->desbuf.desbuf_len,
+				&dparm);
+
+	if (result.stat == DESERR_NONE || result.stat == DESERR_NOHWDEVICE) {
+		bcopy(dparm.des_ivec, result.des_ivec, 8);
+		result.desbuf.desbuf_len = argp->desbuf.desbuf_len;
+		result.desbuf.desbuf_val = argp->desbuf.desbuf_val;
+	}
+
+	return (&result);
+}