diff options
Diffstat (limited to 'src/auth_des.c')
| -rw-r--r-- | src/auth_des.c | 500 |
1 files changed, 500 insertions, 0 deletions
diff --git a/src/auth_des.c b/src/auth_des.c new file mode 100644 index 0000000..c9af2e9 --- /dev/null +++ b/src/auth_des.c @@ -0,0 +1,500 @@ +/* + * 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); +} |