glibc/sunrpc/svcauth_des.c
Ulrich Drepper 26a60f90c7 Update.
1998-06-01  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* nis/nis_call.c: Make directory search faster.

	* nis/nis_callback.c: Insert public key of user in callback data.

	* nis/nis_clone_obj.c: Make size from type u_long, not u_int.

	* nis/nis_creategroup.c: Check for NULL pointer, fill in more fields.

	* nis/nis_findserv.c: Rename __pmap_getport to __pmap_getnisport.

	* nis/nis_intern.h: Remove duplicated prototype.

1998-06-01  Thorsten Kukuk  <kukuk@vt.uni-paderborn.de>

	* sunrpc/auth_des.c: Move prototypes from here ...
	* sunrpc/rpc/auth.h: ... to here.

	* sunrpc/clnt_tcp.c: Add more control flags.
	* sunrpc/clnt_udp.c: Likewise.

	* sunrpc/netname.c (host2netname): Remove prefixing dot from
	domainname.

	* sunrpc/rpc/clnt.h: Document, which control flags are not
	implementable.

	* sunrpc/svcauth_des.c: Use key_decryptsession_pk to avoid deadlock.
1998-06-01 13:10:54 +00:00

567 lines
14 KiB
C

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)svcauth_des.c 2.3 89/07/11 4.0 RPCSRC; from 1.15 88/02/08 SMI";
#endif
/*
* Copyright (c) 1988 by Sun Microsystems, Inc.
*/
/*
* 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
*/
/*
* svcauth_des.c, server-side des authentication
*
* We insure for the service the following:
* (1) The timestamp microseconds do not exceed 1 million.
* (2) The timestamp plus the window is less than the current time.
* (3) The timestamp is not less than the one previously
* seen in the current session.
*
* It is up to the server to determine if the window size is
* too small .
*
*/
#include <string.h>
#include <sys/param.h>
#include <netinet/in.h>
#include <rpc/types.h>
#include <rpc/xdr.h>
#include <rpc/auth.h>
#include <rpc/auth_des.h>
#include <rpc/svc_auth.h>
#include <rpc/svc.h>
#include <rpc/des_crypt.h>
#define debug(msg) /*printf("svcauth_des: %s\n", msg) */
#define USEC_PER_SEC ((u_long) 1000000L)
#define BEFORE(t1, t2) timercmp(t1, t2, <)
/*
* LRU cache of conversation keys and some other useful items.
*/
#define AUTHDES_CACHESZ 64
struct cache_entry
{
des_block key; /* conversation key */
char *rname; /* client's name */
u_int window; /* credential lifetime window */
struct timeval laststamp; /* detect replays of creds */
char *localcred; /* generic local credential */
};
static struct cache_entry *authdes_cache /* [AUTHDES_CACHESZ] */ ;
static short *authdes_lru /* [AUTHDES_CACHESZ] */ ;
static void cache_init (void) internal_function; /* initialize the cache */
static short cache_spot (des_block *, char *, struct timeval *)
internal_function; /* find an entry in the cache */
static void cache_ref (short sid) internal_function;
/* note that sid was ref'd */
static void invalidate (char *cred) internal_function;
/* invalidate entry in cache */
/*
* cache statistics
*/
struct
{
u_long ncachehits; /* times cache hit, and is not replay */
u_long ncachereplays; /* times cache hit, and is replay */
u_long ncachemisses; /* times cache missed */
}
svcauthdes_stats;
/*
* Service side authenticator for AUTH_DES
*/
enum auth_stat
_svcauth_des (register struct svc_req *rqst, register struct rpc_msg *msg)
{
register long *ixdr;
des_block cryptbuf[2];
register struct authdes_cred *cred;
struct authdes_verf verf;
int status;
register struct cache_entry *entry;
short sid = 0;
des_block *sessionkey;
des_block ivec;
u_int window;
struct timeval timestamp;
u_long namelen;
struct area
{
struct authdes_cred area_cred;
char area_netname[MAXNETNAMELEN + 1];
}
*area;
if (authdes_cache == NULL)
cache_init ();
area = (struct area *) rqst->rq_clntcred;
cred = (struct authdes_cred *) &area->area_cred;
/*
* Get the credential
*/
ixdr = (long *) msg->rm_call.cb_cred.oa_base;
cred->adc_namekind = IXDR_GET_ENUM (ixdr, enum authdes_namekind);
switch (cred->adc_namekind)
{
case ADN_FULLNAME:
namelen = IXDR_GET_U_LONG (ixdr);
if (namelen > MAXNETNAMELEN)
{
return AUTH_BADCRED;
}
cred->adc_fullname.name = area->area_netname;
bcopy ((char *) ixdr, cred->adc_fullname.name,
(u_int) namelen);
cred->adc_fullname.name[namelen] = 0;
ixdr += (RNDUP (namelen) / BYTES_PER_XDR_UNIT);
cred->adc_fullname.key.key.high = (u_long) * ixdr++;
cred->adc_fullname.key.key.low = (u_long) * ixdr++;
cred->adc_fullname.window = (u_long) * ixdr++;
break;
case ADN_NICKNAME:
cred->adc_nickname = (u_long) * ixdr++;
break;
default:
return AUTH_BADCRED;
}
/*
* Get the verifier
*/
ixdr = (long *) msg->rm_call.cb_verf.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++;
/*
* Get the conversation key
*/
if (cred->adc_namekind == ADN_FULLNAME)
{
netobj pkey;
char pkey_data[1024];
sessionkey = &cred->adc_fullname.key;
if (!getpublickey (cred->adc_fullname.name, pkey_data))
{
debug("getpublickey");
return AUTH_BADCRED;
}
pkey.n_bytes = pkey_data;
pkey.n_len = strlen (pkey_data) + 1;
if (key_decryptsession_pk (cred->adc_fullname.name, &pkey,
sessionkey) < 0)
{
debug ("decryptsessionkey");
return AUTH_BADCRED; /* key not found */
}
}
else
{ /* ADN_NICKNAME */
sid = (short) cred->adc_nickname;
if (sid >= AUTHDES_CACHESZ)
{
debug ("bad nickname");
return AUTH_BADCRED; /* garbled credential */
}
sessionkey = &authdes_cache[sid].key;
}
/*
* Decrypt the timestamp
*/
cryptbuf[0] = verf.adv_xtimestamp;
if (cred->adc_namekind == ADN_FULLNAME)
{
cryptbuf[1].key.high = cred->adc_fullname.window;
cryptbuf[1].key.low = verf.adv_winverf;
ivec.key.high = ivec.key.low = 0;
status = cbc_crypt ((char *) sessionkey, (char *) cryptbuf,
2 * sizeof (des_block), DES_DECRYPT | DES_HW,
(char *) &ivec);
}
else
{
status = ecb_crypt ((char *) sessionkey, (char *) cryptbuf,
sizeof (des_block), DES_DECRYPT | DES_HW);
}
if (DES_FAILED (status))
{
debug ("decryption failure");
return AUTH_FAILED; /* system error */
}
/*
* XDR the decrypted timestamp
*/
ixdr = (long *) cryptbuf;
timestamp.tv_sec = IXDR_GET_LONG (ixdr);
timestamp.tv_usec = IXDR_GET_LONG (ixdr);
/*
* Check for valid credentials and verifiers.
* They could be invalid because the key was flushed
* out of the cache, and so a new session should begin.
* Be sure and send AUTH_REJECTED{CRED, VERF} if this is the case.
*/
{
struct timeval current;
int nick;
u_int winverf;
if (cred->adc_namekind == ADN_FULLNAME)
{
window = IXDR_GET_U_LONG (ixdr);
winverf = IXDR_GET_U_LONG (ixdr);
if (winverf != window - 1)
{
debug ("window verifier mismatch");
return AUTH_BADCRED; /* garbled credential */
}
sid = cache_spot (sessionkey, cred->adc_fullname.name,
&timestamp);
if (sid < 0)
{
debug ("replayed credential");
return AUTH_REJECTEDCRED; /* replay */
}
nick = 0;
}
else
{ /* ADN_NICKNAME */
window = authdes_cache[sid].window;
nick = 1;
}
if ((u_long) timestamp.tv_usec >= USEC_PER_SEC)
{
debug ("invalid usecs");
/* cached out (bad key), or garbled verifier */
return nick ? AUTH_REJECTEDVERF : AUTH_BADVERF;
}
if (nick && BEFORE (&timestamp,
&authdes_cache[sid].laststamp))
{
debug ("timestamp before last seen");
return (AUTH_REJECTEDVERF); /* replay */
}
gettimeofday (&current, (struct timezone *) NULL);
current.tv_sec -= window; /* allow for expiration */
if (!BEFORE (&current, &timestamp))
{
debug ("timestamp expired");
/* replay, or garbled credential */
return nick ? AUTH_REJECTEDVERF : AUTH_BADCRED;
}
}
/*
* Set up the reply verifier
*/
verf.adv_nickname = (u_long) sid;
/*
* xdr the timestamp before encrypting
*/
ixdr = (long *) cryptbuf;
IXDR_PUT_LONG (ixdr, timestamp.tv_sec - 1);
IXDR_PUT_LONG (ixdr, timestamp.tv_usec);
/*
* encrypt the timestamp
*/
status = ecb_crypt ((char *) sessionkey, (char *) cryptbuf,
sizeof (des_block), DES_ENCRYPT | DES_HW);
if (DES_FAILED (status))
{
debug ("encryption failure");
return AUTH_FAILED; /* system error */
}
verf.adv_xtimestamp = cryptbuf[0];
/*
* Serialize the reply verifier, and update rqst
*/
ixdr = (long *) msg->rm_call.cb_verf.oa_base;
*ixdr++ = (long) verf.adv_xtimestamp.key.high;
*ixdr++ = (long) verf.adv_xtimestamp.key.low;
*ixdr++ = (long) verf.adv_int_u;
rqst->rq_xprt->xp_verf.oa_flavor = AUTH_DES;
rqst->rq_xprt->xp_verf.oa_base = msg->rm_call.cb_verf.oa_base;
rqst->rq_xprt->xp_verf.oa_length =
(char *) ixdr - msg->rm_call.cb_verf.oa_base;
/*
* We succeeded, commit the data to the cache now and
* finish cooking the credential.
*/
entry = &authdes_cache[sid];
entry->laststamp = timestamp;
cache_ref (sid);
if (cred->adc_namekind == ADN_FULLNAME)
{
size_t full_len;
cred->adc_fullname.window = window;
cred->adc_nickname = (u_long) sid; /* save nickname */
if (entry->rname != NULL)
{
mem_free (entry->rname, strlen (entry->rname) + 1);
}
full_len = strlen (cred->adc_fullname.name) + 1;
entry->rname = mem_alloc ((u_int) full_len);
if (entry->rname != NULL)
{
memcpy (entry->rname, cred->adc_fullname.name, full_len);
}
else
{
debug ("out of memory");
}
entry->key = *sessionkey;
entry->window = window;
invalidate (entry->localcred); /* mark any cached cred invalid */
}
else
{ /* ADN_NICKNAME */
/*
* nicknames are cooked into fullnames
*/
cred->adc_namekind = ADN_FULLNAME;
cred->adc_fullname.name = entry->rname;
cred->adc_fullname.key = entry->key;
cred->adc_fullname.window = entry->window;
}
return AUTH_OK; /* we made it! */
}
/*
* Initialize the cache
*/
static void
internal_function
cache_init (void)
{
register int i;
authdes_cache = (struct cache_entry *)
mem_alloc (sizeof (struct cache_entry) * AUTHDES_CACHESZ);
bzero ((char *) authdes_cache,
sizeof (struct cache_entry) * AUTHDES_CACHESZ);
authdes_lru = (short *) mem_alloc (sizeof (short) * AUTHDES_CACHESZ);
/*
* Initialize the lru list
*/
for (i = 0; i < AUTHDES_CACHESZ; i++)
{
authdes_lru[i] = i;
}
}
/*
* Find the lru victim
*/
static short
cache_victim (void)
{
return (authdes_lru[AUTHDES_CACHESZ - 1]);
}
/*
* Note that sid was referenced
*/
static void
internal_function
cache_ref (register short sid)
{
register int i;
register short curr;
register short prev;
prev = authdes_lru[0];
authdes_lru[0] = sid;
for (i = 1; prev != sid; i++)
{
curr = authdes_lru[i];
authdes_lru[i] = prev;
prev = curr;
}
}
/*
* Find a spot in the cache for a credential containing
* the items given. Return -1 if a replay is detected, otherwise
* return the spot in the cache.
*/
static short
internal_function
cache_spot (register des_block * key, char *name, struct timeval *timestamp)
{
register struct cache_entry *cp;
register int i;
register u_long hi;
hi = key->key.high;
for (cp = authdes_cache, i = 0; i < AUTHDES_CACHESZ; i++, cp++)
{
if (cp->key.key.high == hi &&
cp->key.key.low == key->key.low &&
cp->rname != NULL &&
bcmp (cp->rname, name, strlen (name) + 1) == 0)
{
if (BEFORE (timestamp, &cp->laststamp))
{
svcauthdes_stats.ncachereplays++;
return -1; /* replay */
}
svcauthdes_stats.ncachehits++;
return i; /* refresh */
}
}
svcauthdes_stats.ncachemisses++;
return cache_victim (); /* new credential */
}
/*
* Local credential handling stuff.
* NOTE: bsd unix dependent.
* Other operating systems should put something else here.
*/
#define UNKNOWN -2 /* grouplen, if cached cred is unknown user */
#define INVALID -1 /* grouplen, if cache entry is invalid */
struct bsdcred
{
uid_t uid; /* cached uid */
gid_t gid; /* cached gid */
short grouplen; /* length of cached groups */
gid_t groups[NGROUPS]; /* cached groups */
};
/*
* Map a des credential into a unix cred.
* We cache the credential here so the application does
* not have to make an rpc call every time to interpret
* the credential.
*/
int
authdes_getucred (const struct authdes_cred *adc, uid_t * uid, gid_t * gid,
short *grouplen, gid_t * groups)
{
unsigned sid;
register int i;
uid_t i_uid;
gid_t i_gid;
int i_grouplen;
struct bsdcred *cred;
sid = adc->adc_nickname;
if (sid >= AUTHDES_CACHESZ)
{
debug ("invalid nickname");
return 0;
}
cred = (struct bsdcred *) authdes_cache[sid].localcred;
if (cred == NULL)
{
cred = (struct bsdcred *) mem_alloc (sizeof (struct bsdcred));
authdes_cache[sid].localcred = (char *) cred;
cred->grouplen = INVALID;
}
if (cred->grouplen == INVALID)
{
/*
* not in cache: lookup
*/
if (!netname2user (adc->adc_fullname.name, &i_uid, &i_gid,
&i_grouplen, groups))
{
debug ("unknown netname");
cred->grouplen = UNKNOWN; /* mark as lookup up, but not found */
return 0;
}
debug ("missed ucred cache");
*uid = cred->uid = i_uid;
*gid = cred->gid = i_gid;
*grouplen = cred->grouplen = i_grouplen;
for (i = i_grouplen - 1; i >= 0; i--)
{
cred->groups[i] = groups[i]; /* int to short */
}
return 1;
}
else if (cred->grouplen == UNKNOWN)
{
/*
* Already lookup up, but no match found
*/
return 0;
}
/*
* cached credentials
*/
*uid = cred->uid;
*gid = cred->gid;
*grouplen = cred->grouplen;
for (i = cred->grouplen - 1; i >= 0; i--)
{
groups[i] = cred->groups[i]; /* short to int */
}
return 1;
}
static void
internal_function
invalidate (char *cred)
{
if (cred == NULL)
{
return;
}
((struct bsdcred *) cred)->grouplen = INVALID;
}