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-rw-r--r--src/auth_des.c500
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diff --git a/src/auth_des.c b/src/auth_des.c
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+/*
+ * Copyright (c) 2009, Sun Microsystems, Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * - Redistributions of source code must retain the above copyright notice,
+ * this list of conditions and the following disclaimer.
+ * - 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.
+ * - Neither the name of Sun Microsystems, Inc. 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 COPYRIGHT HOLDERS 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 COPYRIGHT HOLDER 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.
+ */
+/*
+ * Copyright (c) 1988 by Sun Microsystems, Inc.
+ */
+/*
+ * auth_des.c, client-side implementation of DES authentication
+ */
+#include <pthread.h>
+#include <reentrant.h>
+#include <err.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <rpc/des_crypt.h>
+#include <syslog.h>
+#include <rpc/types.h>
+#include <rpc/auth.h>
+#include <rpc/auth_des.h>
+#include <rpc/clnt.h>
+#include <rpc/xdr.h>
+#include <sys/socket.h>
+
+#include "nis.h"
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#endif
+
+#include "debug.h"
+
+#define USEC_PER_SEC 1000000
+#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)
+
+extern bool_t xdr_authdes_cred( XDR *, struct authdes_cred *);
+extern bool_t xdr_authdes_verf( XDR *, struct authdes_verf *);
+extern int key_encryptsession_pk( char *, netobj *, des_block *);
+
+extern bool_t __rpc_get_time_offset(struct timeval *, nis_server *, char *,
+ char **, char **);
+
+/*
+ * DES authenticator operations vector
+ */
+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 *, void *);
+static void authdes_destroy(AUTH *);
+
+static struct auth_ops *authdes_ops(void);
+
+/*
+ * 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 netbuf ad_syncaddr; /* remote host to synch with */
+ char *ad_timehost; /* remote host to synch with */
+ struct timeval ad_timediff; /* server's time - client's time */
+ u_int 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]; /* Server's actual public key */
+ char *ad_netid; /* Timehost netid */
+ char *ad_uaddr; /* Timehost uaddr */
+ nis_server *ad_nis_srvr; /* NIS+ server struct */
+};
+
+AUTH *authdes_pk_seccreate(const char *, netobj *, u_int, const char *,
+ const des_block *, nis_server *);
+
+/*
+ * documented version of authdes_seccreate
+ */
+/*
+ servername: network name of server
+ win: time to live
+ timehost: optional hostname to sync with
+ ckey: optional conversation key to use
+*/
+
+AUTH *
+authdes_seccreate(const char *servername, const u_int win,
+ const char *timehost, const des_block *ckey)
+{
+ u_char pkey_data[1024];
+ netobj pkey;
+ AUTH *dummy;
+
+ if (! getpublickey(servername, (char *) pkey_data)) {
+ syslog(LOG_ERR,
+ "authdes_seccreate: no public key found for %s",
+ servername);
+ return (NULL);
+ }
+
+ pkey.n_bytes = (char *) pkey_data;
+ pkey.n_len = (u_int)strlen((char *)pkey_data) + 1;
+ dummy = authdes_pk_seccreate(servername, &pkey, win, timehost,
+ ckey, NULL);
+ return (dummy);
+}
+
+/*
+ * Slightly modified version of authdessec_create which takes the public key
+ * of the server principal as an argument. This spares us a call to
+ * getpublickey() which in the nameserver context can cause a deadlock.
+ */
+AUTH *
+authdes_pk_seccreate(const char *servername, netobj *pkey, u_int window,
+ const char *timehost, const des_block *ckey, nis_server *srvr)
+{
+ AUTH *auth;
+ struct ad_private *ad;
+ char namebuf[MAXNETNAMELEN+1];
+
+ /*
+ * Allocate everything now
+ */
+ auth = ALLOC(AUTH);
+ if (auth == NULL) {
+ syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
+ return (NULL);
+ }
+ ad = ALLOC(struct ad_private);
+ if (ad == NULL) {
+ syslog(LOG_ERR, "authdes_pk_seccreate: out of memory");
+ goto failed;
+ }
+ ad->ad_fullname = ad->ad_servername = NULL; /* Sanity reasons */
+ ad->ad_timehost = NULL;
+ ad->ad_netid = NULL;
+ ad->ad_uaddr = NULL;
+ ad->ad_nis_srvr = NULL;
+ ad->ad_timediff.tv_sec = 0;
+ ad->ad_timediff.tv_usec = 0;
+ memcpy(ad->ad_pkey, pkey->n_bytes, pkey->n_len);
+ if (!getnetname(namebuf))
+ goto failed;
+ ad->ad_fullnamelen = RNDUP((u_int) strlen(namebuf));
+ ad->ad_fullname = (char *)mem_alloc(ad->ad_fullnamelen + 1);
+ ad->ad_servernamelen = strlen(servername);
+ ad->ad_servername = (char *)mem_alloc(ad->ad_servernamelen + 1);
+
+ if (ad->ad_fullname == NULL || ad->ad_servername == NULL) {
+ syslog(LOG_ERR, "authdes_seccreate: out of memory");
+ goto failed;
+ }
+ if (timehost != NULL) {
+ ad->ad_timehost = (char *)mem_alloc(strlen(timehost) + 1);
+ if (ad->ad_timehost == NULL) {
+ syslog(LOG_ERR, "authdes_seccreate: out of memory");
+ goto failed;
+ }
+ memcpy(ad->ad_timehost, timehost, strlen(timehost) + 1);
+ ad->ad_dosync = TRUE;
+ } else if (srvr != NULL) {
+ ad->ad_nis_srvr = srvr; /* transient */
+ ad->ad_dosync = TRUE;
+ } else {
+ ad->ad_dosync = FALSE;
+ }
+ memcpy(ad->ad_fullname, namebuf, ad->ad_fullnamelen + 1);
+ memcpy(ad->ad_servername, servername, ad->ad_servernamelen + 1);
+ ad->ad_window = window;
+ if (ckey == NULL) {
+ if (key_gendes(&auth->ah_key) < 0) {
+ syslog(LOG_ERR,
+ "authdes_seccreate: keyserv(1m) is unable to generate session key");
+ goto failed;
+ }
+ } 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, NULL)) {
+ goto failed;
+ }
+ ad->ad_nis_srvr = NULL; /* not needed any longer */
+ return (auth);
+
+failed:
+ if (auth)
+ FREE(auth, sizeof (AUTH));
+ if (ad) {
+ if (ad->ad_fullname)
+ FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
+ if (ad->ad_servername)
+ FREE(ad->ad_servername, ad->ad_servernamelen + 1);
+ if (ad->ad_timehost)
+ FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
+ if (ad->ad_netid)
+ FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
+ if (ad->ad_uaddr)
+ FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
+ FREE(ad, sizeof (struct ad_private));
+ }
+ 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)
+{
+/* LINTED pointer alignment */
+ 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;
+ rpc_inline_t *ixdr;
+
+ /*
+ * Figure out the "time", accounting for any time difference
+ * with the server if necessary.
+ */
+ (void) 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;
+ while (ad->ad_timestamp.tv_usec >= USEC_PER_SEC) {
+ ad->ad_timestamp.tv_usec -= USEC_PER_SEC;
+ ad->ad_timestamp.tv_sec++;
+ }
+
+ /*
+ * XDR the timestamp and possibly some other things, then
+ * encrypt them.
+ */
+ ixdr = (rpc_inline_t *)cryptbuf;
+ IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_sec);
+ IXDR_PUT_INT32(ixdr, ad->ad_timestamp.tv_usec);
+ if (ad->ad_cred.adc_namekind == ADN_FULLNAME) {
+ IXDR_PUT_U_INT32(ixdr, ad->ad_window);
+ IXDR_PUT_U_INT32(ixdr, ad->ad_window - 1);
+ ivec.key.high = ivec.key.low = 0;
+ status = cbc_crypt((char *)&auth->ah_key, (char *)cryptbuf,
+ (u_int) 2 * sizeof (des_block),
+ DES_ENCRYPT | DES_HW, (char *)&ivec);
+ } else {
+ status = ecb_crypt((char *)&auth->ah_key, (char *)cryptbuf,
+ (u_int) sizeof (des_block),
+ DES_ENCRYPT | DES_HW);
+ }
+ if (DES_FAILED(status)) {
+ syslog(LOG_ERR, "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))) {
+ IXDR_PUT_INT32(ixdr, AUTH_DES);
+ IXDR_PUT_INT32(ixdr, len);
+ } else {
+ ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_cred.oa_flavor));
+ ATTEMPT(xdr_putint32(xdrs, &len));
+ }
+ ATTEMPT(xdr_authdes_cred(xdrs, cred));
+
+ len = (2 + 1)*BYTES_PER_XDR_UNIT;
+ if ((ixdr = xdr_inline(xdrs, 2*BYTES_PER_XDR_UNIT))) {
+ IXDR_PUT_INT32(ixdr, AUTH_DES);
+ IXDR_PUT_INT32(ixdr, len);
+ } else {
+ ATTEMPT(xdr_putint32(xdrs, (int *)&auth->ah_verf.oa_flavor));
+ ATTEMPT(xdr_putint32(xdrs, &len));
+ }
+ ATTEMPT(xdr_authdes_verf(xdrs, verf));
+ return (TRUE);
+}
+
+
+/*
+ * 3. Validate
+ */
+static bool_t
+authdes_validate(AUTH *auth, struct opaque_auth *rverf)
+{
+/* LINTED pointer alignment */
+ struct ad_private *ad = AUTH_PRIVATE(auth);
+ struct authdes_verf verf;
+ int status;
+ uint32_t *ixdr;
+ des_block buf;
+
+ if (rverf->oa_length != (2 + 1) * BYTES_PER_XDR_UNIT) {
+ return (FALSE);
+ }
+/* LINTED pointer alignment */
+ ixdr = (uint32_t *)rverf->oa_base;
+ buf.key.high = (uint32_t)*ixdr++;
+ buf.key.low = (uint32_t)*ixdr++;
+ verf.adv_int_u = (uint32_t)*ixdr++;
+
+ /*
+ * Decrypt the timestamp
+ */
+ status = ecb_crypt((char *)&auth->ah_key, (char *)&buf,
+ (u_int)sizeof (des_block), DES_DECRYPT | DES_HW);
+
+ if (DES_FAILED(status)) {
+ syslog(LOG_ERR, "authdes_validate: DES decryption failure");
+ return (FALSE);
+ }
+
+ /*
+ * xdr the decrypted timestamp
+ */
+/* LINTED pointer alignment */
+ ixdr = (uint32_t *)buf.c;
+ verf.adv_timestamp.tv_sec = IXDR_GET_INT32(ixdr) + 1;
+ verf.adv_timestamp.tv_usec = IXDR_GET_INT32(ixdr);
+
+ /*
+ * validate
+ */
+ if (memcmp((char *)&ad->ad_timestamp, (char *)&verf.adv_timestamp,
+ sizeof(struct timeval)) != 0) {
+ LIBTIRPC_DEBUG(1, ("authdes_validate: verifier mismatch"));
+ 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
+ */
+/*ARGSUSED*/
+static bool_t
+authdes_refresh(AUTH *auth, void *dummy)
+{
+/* LINTED pointer alignment */
+ struct ad_private *ad = AUTH_PRIVATE(auth);
+ struct authdes_cred *cred = &ad->ad_cred;
+ int ok;
+ netobj pkey;
+
+ if (ad->ad_dosync) {
+ ok = __rpc_get_time_offset(&ad->ad_timediff, ad->ad_nis_srvr,
+ ad->ad_timehost, &(ad->ad_uaddr),
+ &(ad->ad_netid));
+ if (! ok) {
+ /*
+ * Hope the clocks are synced!
+ */
+ ad->ad_dosync = 0;
+ LIBTIRPC_DEBUG(1, ("authdes_refresh: unable to synchronize clock"));
+ }
+ }
+ ad->ad_xkey = auth->ah_key;
+ pkey.n_bytes = (char *)(ad->ad_pkey);
+ pkey.n_len = (u_int)strlen((char *)ad->ad_pkey) + 1;
+ if (key_encryptsession_pk(ad->ad_servername, &pkey, &ad->ad_xkey) < 0) {
+ LIBTIRPC_DEBUG(1,
+ ("authdes_refresh: keyserv(1m) is unable to encrypt session 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)
+{
+/* LINTED pointer alignment */
+ struct ad_private *ad = AUTH_PRIVATE(auth);
+
+ FREE(ad->ad_fullname, ad->ad_fullnamelen + 1);
+ FREE(ad->ad_servername, ad->ad_servernamelen + 1);
+ if (ad->ad_timehost)
+ FREE(ad->ad_timehost, strlen(ad->ad_timehost) + 1);
+ if (ad->ad_netid)
+ FREE(ad->ad_netid, strlen(ad->ad_netid) + 1);
+ if (ad->ad_uaddr)
+ FREE(ad->ad_uaddr, strlen(ad->ad_uaddr) + 1);
+ FREE(ad, sizeof (struct ad_private));
+ FREE(auth, sizeof(AUTH));
+}
+
+static bool_t
+authdes_wrap(AUTH *auth, XDR *xdrs, xdrproc_t xfunc, caddr_t xwhere)
+{
+ return ((*xfunc)(xdrs, xwhere));
+}
+
+static struct auth_ops *
+authdes_ops(void)
+{
+ static struct auth_ops ops;
+ extern mutex_t authdes_ops_lock;
+
+ /* VARIABLES PROTECTED BY ops_lock: ops */
+
+ mutex_lock(&authdes_ops_lock);
+ if (ops.ah_nextverf == NULL) {
+ ops.ah_nextverf = authdes_nextverf;
+ ops.ah_marshal = authdes_marshal;
+ ops.ah_validate = authdes_validate;
+ ops.ah_refresh = authdes_refresh;
+ ops.ah_destroy = authdes_destroy;
+ ops.ah_wrap = authdes_wrap;
+ ops.ah_unwrap = authdes_wrap;
+ }
+ mutex_unlock(&authdes_ops_lock);
+ return (&ops);
+}
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