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-rw-r--r--sunrpc/auth_des.c459
1 files changed, 459 insertions, 0 deletions
diff --git a/sunrpc/auth_des.c b/sunrpc/auth_des.c
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--- /dev/null
+++ b/sunrpc/auth_des.c
@@ -0,0 +1,459 @@
+#if defined(LIBC_SCCS) && !defined(lint)
+static char sccsid[] = "@(#)auth_des.c 2.2 88/07/29 4.0 RPCSRC; from 1.9 88/02/08 SMI";
+#endif
+/*
+ * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
+ * unrestricted use provided that this legend is included on all tape
+ * media and as a part of the software program in whole or part. Users
+ * may copy or modify Sun RPC without charge, but are not authorized
+ * to license or distribute it to anyone else except as part of a product or
+ * program developed by the user.
+ *
+ * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
+ * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
+ *
+ * Sun RPC is provided with no support and without any obligation on the
+ * part of Sun Microsystems, Inc. to assist in its use, correction,
+ * modification or enhancement.
+ *
+ * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
+ * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
+ * OR ANY PART THEREOF.
+ *
+ * In no event will Sun Microsystems, Inc. be liable for any lost revenue
+ * or profits or other special, indirect and consequential damages, even if
+ * Sun has been advised of the possibility of such damages.
+ *
+ * Sun Microsystems, Inc.
+ * 2550 Garcia Avenue
+ * Mountain View, California 94043
+ */
+/*
+ * Copyright (c) 1988 by Sun Microsystems, Inc.
+ */
+/*
+ * auth_des.c, client-side implementation of DES authentication
+ */
+
+#include <string.h>
+#include <rpc/des_crypt.h>
+#include <rpc/types.h>
+#include <rpc/auth.h>
+#include <rpc/auth_des.h>
+#include <rpc/xdr.h>
+#include <netinet/in.h> /* XXX: just to get htonl() and ntohl() */
+#include <sys/socket.h>
+
+#define MILLION 1000000L
+#define RTIME_TIMEOUT 5 /* seconds to wait for sync */
+
+#define AUTH_PRIVATE(auth) (struct ad_private *) auth->ah_private
+#define ALLOC(object_type) (object_type *) mem_alloc(sizeof(object_type))
+#define FREE(ptr, size) mem_free((char *)(ptr), (int) size)
+#define ATTEMPT(xdr_op) if (!(xdr_op)) return (FALSE)
+
+#define debug(msg) /* printf("%s\n", msg) */
+
+extern int rtime (struct sockaddr_in *, struct timeval *, struct timeval *);
+extern bool_t xdr_authdes_cred (XDR *, struct authdes_cred *);
+extern bool_t xdr_authdes_verf (XDR *, struct authdes_verf *);
+
+/*
+ * DES authenticator operations vector
+ */
+AUTH *authdes_create (const char *, u_int, struct sockaddr *,
+ des_block *);
+AUTH *authdes_pk_create (const char *, netobj *, u_int,
+ struct sockaddr *, des_block *);
+static void authdes_nextverf (AUTH *);
+static bool_t authdes_marshal (AUTH *, XDR *);
+static bool_t authdes_validate (AUTH *, struct opaque_auth *);
+static bool_t authdes_refresh (AUTH *);
+static void authdes_destroy (AUTH *);
+static bool_t synchronize (struct sockaddr *, struct timeval *);
+
+static struct auth_ops authdes_ops =
+{
+ authdes_nextverf,
+ authdes_marshal,
+ authdes_validate,
+ authdes_refresh,
+ authdes_destroy
+};
+
+
+/*
+ * This struct is pointed to by the ah_private field of an "AUTH *"
+ */
+struct ad_private
+ {
+ char *ad_fullname; /* client's full name */
+ u_int ad_fullnamelen; /* length of name, rounded up */
+ char *ad_servername; /* server's full name */
+ u_int ad_servernamelen; /* length of name, rounded up */
+ u_int ad_window; /* client specified window */
+ bool_t ad_dosync; /* synchronize? */
+ struct sockaddr ad_syncaddr; /* remote host to synch with */
+ struct timeval ad_timediff; /* server's time - client's time */
+ u_long ad_nickname; /* server's nickname for client */
+ struct authdes_cred ad_cred; /* storage for credential */
+ struct authdes_verf ad_verf; /* storage for verifier */
+ struct timeval ad_timestamp; /* timestamp sent */
+ des_block ad_xkey; /* encrypted conversation key */
+ u_char ad_pkey[1024]; /* Servers actual public key */
+ };
+
+
+/*
+ * Create the client des authentication object
+ */
+AUTH *
+authdes_create (const char *servername, u_int window,
+ struct sockaddr *syncaddr, des_block * ckey)
+ /* servername - network name of server */
+ /* window - time to live */
+ /* syncaddr - optional addr of host to sync with */
+ /* ckey - optional conversation key to use */
+{
+ u_char pkey_data[1024];
+ netobj pkey;
+
+ if (!getpublickey (servername, pkey_data))
+ return (NULL);
+
+ pkey.n_bytes = (char *) pkey_data;
+ pkey.n_len = strlen ((char *) pkey_data) + 1;
+ return authdes_pk_create (servername, &pkey, window, syncaddr, ckey);
+}
+
+AUTH *
+authdes_pk_create (const char *servername, netobj * pkey, u_int window,
+ struct sockaddr * syncaddr, des_block * ckey)
+{
+ AUTH *auth;
+ struct ad_private *ad;
+ char namebuf[MAXNETNAMELEN + 1];
+
+ /*
+ * Allocate everything now
+ */
+ auth = ALLOC (AUTH);
+ ad = ALLOC (struct ad_private);
+ memcpy (ad->ad_pkey, pkey->n_bytes, pkey->n_len);
+ if (!getnetname (namebuf))
+ goto failed;
+ ad->ad_fullnamelen = RNDUP (strlen (namebuf));
+ ad->ad_fullname = mem_alloc (ad->ad_fullnamelen + 1);
+
+ ad->ad_servernamelen = strlen (servername);
+ ad->ad_servername = mem_alloc (ad->ad_servernamelen + 1);
+
+ if (auth == NULL || ad == NULL || ad->ad_fullname == NULL ||
+ ad->ad_servername == NULL)
+ {
+ debug ("authdes_create: out of memory");
+ goto failed;
+ }
+
+ /*
+ * Set up private data
+ */
+ bcopy (namebuf, ad->ad_fullname, ad->ad_fullnamelen + 1);
+ bcopy (servername, ad->ad_servername, ad->ad_servernamelen + 1);
+ if (syncaddr != NULL)
+ {
+ ad->ad_syncaddr = *syncaddr;
+ ad->ad_dosync = TRUE;
+ }
+ else
+ ad->ad_dosync = FALSE;
+
+ ad->ad_window = window;
+ if (ckey == NULL)
+ {
+ if (key_gendes (&auth->ah_key) < 0)
+ {
+ debug ("authdes_create: unable to gen conversation key");
+ return (NULL);
+ }
+ }
+ else
+ auth->ah_key = *ckey;
+
+ /*
+ * Set up auth handle
+ */
+ auth->ah_cred.oa_flavor = AUTH_DES;
+ auth->ah_verf.oa_flavor = AUTH_DES;
+ auth->ah_ops = &authdes_ops;
+ auth->ah_private = (caddr_t) ad;
+
+ if (!authdes_refresh (auth))
+ goto failed;
+
+ return (auth);
+
+failed:
+ if (auth != NULL)
+ FREE (auth, sizeof (AUTH));
+ if (ad != NULL)
+ FREE (ad, sizeof (struct ad_private));
+ if (ad->ad_fullname != NULL)
+ FREE (ad->ad_fullname, ad->ad_fullnamelen + 1);
+ if (ad->ad_servername != NULL)
+ FREE (ad->ad_servername, ad->ad_servernamelen + 1);
+ return (NULL);
+}
+
+/*
+ * Implement the five authentication operations
+ */
+
+
+/*
+ * 1. Next Verifier
+ */
+/*ARGSUSED */
+static void
+authdes_nextverf (AUTH * auth)
+{
+ /* what the heck am I supposed to do??? */
+}
+
+
+
+/*
+ * 2. Marshal
+ */
+static bool_t
+authdes_marshal (AUTH * auth, XDR * xdrs)
+{
+ struct ad_private *ad = AUTH_PRIVATE (auth);
+ struct authdes_cred *cred = &ad->ad_cred;
+ struct authdes_verf *verf = &ad->ad_verf;
+ des_block cryptbuf[2];
+ des_block ivec;
+ int status;
+ int len;
+ register long *ixdr;
+
+ /*
+ * Figure out the "time", accounting for any time difference
+ * with the server if necessary.
+ */
+ gettimeofday (&ad->ad_timestamp, (struct timezone *) NULL);
+ ad->ad_timestamp.tv_sec += ad->ad_timediff.tv_sec;
+ ad->ad_timestamp.tv_usec += ad->ad_timediff.tv_usec;
+ if (ad->ad_timestamp.tv_usec >= MILLION)
+ {
+ ad->ad_timestamp.tv_usec -= MILLION;
+ ad->ad_timestamp.tv_sec += 1;
+ }
+
+ /*
+ * XDR the timestamp and possibly some other things, then
+ * encrypt them.
+ */
+ ixdr = (long *) cryptbuf;
+ IXDR_PUT_LONG (ixdr, ad->ad_timestamp.tv_sec);
+ IXDR_PUT_LONG (ixdr, ad->ad_timestamp.tv_usec);
+ if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
+ {
+ IXDR_PUT_U_LONG (ixdr, ad->ad_window);
+ IXDR_PUT_U_LONG (ixdr, ad->ad_window - 1);
+ ivec.key.high = ivec.key.low = 0;
+ status = cbc_crypt ((char *) &auth->ah_key, (char *) cryptbuf,
+ 2 * sizeof (des_block), DES_ENCRYPT | DES_HW, (char *) &ivec);
+ }
+ else
+ {
+ status = ecb_crypt ((char *) &auth->ah_key, (char *) cryptbuf,
+ sizeof (des_block), DES_ENCRYPT | DES_HW);
+ }
+ if (DES_FAILED (status))
+ {
+ debug ("authdes_marshal: DES encryption failure");
+ return (FALSE);
+ }
+ ad->ad_verf.adv_xtimestamp = cryptbuf[0];
+ if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
+ {
+ ad->ad_cred.adc_fullname.window = cryptbuf[1].key.high;
+ ad->ad_verf.adv_winverf = cryptbuf[1].key.low;
+ }
+ else
+ {
+ ad->ad_cred.adc_nickname = ad->ad_nickname;
+ ad->ad_verf.adv_winverf = 0;
+ }
+
+ /*
+ * Serialize the credential and verifier into opaque
+ * authentication data.
+ */
+ if (ad->ad_cred.adc_namekind == ADN_FULLNAME)
+ {
+ len = ((1 + 1 + 2 + 1) * BYTES_PER_XDR_UNIT + ad->ad_fullnamelen);
+ }
+ else
+ {
+ len = (1 + 1) * BYTES_PER_XDR_UNIT;
+ }
+
+ if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
+ {
+ IXDR_PUT_LONG (ixdr, AUTH_DES);
+ IXDR_PUT_LONG (ixdr, len);
+ }
+ else
+ {
+ ATTEMPT (xdr_putlong (xdrs, (long *)&auth->ah_cred.oa_flavor));
+ ATTEMPT (xdr_putlong (xdrs, (long *)&len));
+ }
+ ATTEMPT (xdr_authdes_cred (xdrs, cred));
+
+ len = (2 + 1) * BYTES_PER_XDR_UNIT;
+ if ((ixdr = xdr_inline (xdrs, 2 * BYTES_PER_XDR_UNIT)) != NULL)
+ {
+ IXDR_PUT_LONG (ixdr, AUTH_DES);
+ IXDR_PUT_LONG (ixdr, len);
+ }
+ else
+ {
+ ATTEMPT (xdr_putlong (xdrs, (long *)&auth->ah_verf.oa_flavor));
+ ATTEMPT (xdr_putlong (xdrs, (long *)&len));
+ }
+ ATTEMPT (xdr_authdes_verf (xdrs, verf));
+ return (TRUE);
+}
+
+
+/*
+ * 3. Validate
+ */
+static bool_t
+authdes_validate (AUTH * auth, struct opaque_auth *rverf)
+{
+ struct ad_private *ad = AUTH_PRIVATE (auth);
+ struct authdes_verf verf;
+ int status;
+ register u_long *ixdr;
+
+ if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT)
+ return (FALSE);
+
+ ixdr = (u_long *) rverf->oa_base;
+ verf.adv_xtimestamp.key.high = (u_long) * ixdr++;
+ verf.adv_xtimestamp.key.low = (u_long) * ixdr++;
+ verf.adv_int_u = (u_long) * ixdr++; /* nickname not XDR'd ! */
+
+ /*
+ * Decrypt the timestamp
+ */
+ status = ecb_crypt ((char *) &auth->ah_key, (char *) &verf.adv_xtimestamp,
+ sizeof (des_block), DES_DECRYPT | DES_HW);
+
+ if (DES_FAILED (status))
+ {
+ debug ("authdes_validate: DES decryption failure");
+ return (FALSE);
+ }
+
+ /*
+ * xdr the decrypted timestamp
+ */
+ ixdr = (u_long *) verf.adv_xtimestamp.c;
+ verf.adv_timestamp.tv_sec = IXDR_GET_LONG (ixdr) + 1;
+ verf.adv_timestamp.tv_usec = IXDR_GET_LONG (ixdr);
+
+ /*
+ * validate
+ */
+ if (bcmp ((char *) &ad->ad_timestamp, (char *) &verf.adv_timestamp,
+ sizeof (struct timeval)) != 0)
+ {
+ debug ("authdes_validate: verifier mismatch\n");
+ return (FALSE);
+ }
+
+ /*
+ * We have a nickname now, let's use it
+ */
+ ad->ad_nickname = verf.adv_nickname;
+ ad->ad_cred.adc_namekind = ADN_NICKNAME;
+ return (TRUE);
+}
+
+/*
+ * 4. Refresh
+ */
+static bool_t
+authdes_refresh (AUTH * auth)
+{
+ netobj pkey;
+ struct ad_private *ad = AUTH_PRIVATE (auth);
+ struct authdes_cred *cred = &ad->ad_cred;
+
+ if (ad->ad_dosync &&
+ !synchronize (&ad->ad_syncaddr, &ad->ad_timediff))
+ {
+ /*
+ * Hope the clocks are synced!
+ */
+ ad->ad_timediff.tv_sec = ad->ad_timediff.tv_usec = 0;
+ debug ("authdes_refresh: unable to synchronize with server");
+ }
+ ad->ad_xkey = auth->ah_key;
+ pkey.n_bytes = (char *) (ad->ad_pkey);
+ pkey.n_len = strlen ((char *) ad->ad_pkey) + 1;
+ if (key_encryptsession_pk (ad->ad_servername, &pkey, &ad->ad_xkey) < 0)
+ {
+ debug ("authdes_create: unable to encrypt conversation key");
+ return (FALSE);
+ }
+ cred->adc_fullname.key = ad->ad_xkey;
+ cred->adc_namekind = ADN_FULLNAME;
+ cred->adc_fullname.name = ad->ad_fullname;
+ return (TRUE);
+}
+
+/*
+ * 5. Destroy
+ */
+static void
+authdes_destroy (AUTH * auth)
+{
+ struct ad_private *ad = AUTH_PRIVATE (auth);
+
+ FREE (ad->ad_fullname, ad->ad_fullnamelen + 1);
+ FREE (ad->ad_servername, ad->ad_servernamelen + 1);
+ FREE (ad, sizeof (struct ad_private));
+ FREE (auth, sizeof (AUTH));
+}
+
+/*
+ * Synchronize with the server at the given address, that is,
+ * adjust timep to reflect the delta between our clocks
+ */
+static bool_t
+synchronize (struct sockaddr *syncaddr, struct timeval *timep)
+{
+ struct timeval mytime;
+ struct timeval timeout;
+
+ timeout.tv_sec = RTIME_TIMEOUT;
+ timeout.tv_usec = 0;
+ if (rtime ((struct sockaddr_in *) syncaddr, timep, &timeout) < 0)
+ return (FALSE);
+
+ gettimeofday (&mytime, (struct timezone *) NULL);
+ timep->tv_sec -= mytime.tv_sec;
+ if (mytime.tv_usec > timep->tv_usec)
+ {
+ timep->tv_sec -= 1;
+ timep->tv_usec += MILLION;
+ }
+ timep->tv_usec -= mytime.tv_usec;
+ return (TRUE);
+}
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