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authorUlrich Drepper <drepper@redhat.com>1997-08-29 21:01:47 +0000
committerUlrich Drepper <drepper@redhat.com>1997-08-29 21:01:47 +0000
commit800d775e426b9c0af63f711b79b09bf540c97456 (patch)
treeff7858571c81f2e6077c5e35b465494052984876 /sunrpc/svcauth_des.c
parent39e16978c3b4ac8eaf2201fac56316623910d9da (diff)
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1997-08-29 21:45 Ulrich Drepper <drepper@cygnus.com> * sunrpc/auth_des.c: New file. Copied from former secure_rpc add-on. * sunrpc/authdes_prot.c: New file. Likewise. * sunrpc/des.h: New file. Likewise. * sunrpc/des_crypt.c: New file. Likewise. * sunrpc/des_soft.c: New file. Likewise. * sunrpc/key_call.c: New file. Likewise. * sunrpc/key_prot.c: New file. Likewise. * sunrpc/netname.c: New file. Likewise. * sunrpc/openchild.c: New file. Likewise. * sunrpc/rtime.c: New file. Likewise. * sunrpc/svc_auth.c: New file. Likewise. * sunrpc/svcauth_des.c: New file. Likewise. * sunrpc/xcrypt.c: New file. Likewise. * sunrpc/rpc/auth.h: New file. Likewise. * sunrpc/rpc/auth_des.h: New file. Likewise. * sunrpc/rpc/des_crypt.h: New file. Likewise. * sunrpc/rpc/key_prot.h: New file. Likewise. * sunrpc/rpcsvc/key_prot.x: New file. Likewise. * sysdeps/generic/svc_auth.h: Removed. * sysdeps/generic/rpc/auth.h: Removed. * sysdeps/generic/rpc/auth_des.h: Removed. * sysdeps/stub/des_impl.c: New file. Stub version for DES. * sunrpc/Makefile (rpcsvc): Add keyprot.x. (headers): Add des_crypt.h and key_prot.h. (routines): Add auth_des, authdes_prot, des_crypt, des_impl, des_soft, key_call, key_prot, netname, openchild, rtime, svcauth_des, xcrypt. (distribute): Add des.h. * db2/Makefile: Add all headers and other files to distribute. (others): Add db_printlog. * sysdeps/mach/hurd/Dist: Add net/* headers. * sysdeps/mach/hurd/mips/Dist: New file. * sysdeps/powerpc/Dist: Add fe_nomask.c and t_sqrt.c. * sysdeps/sparc/Dist: Add sys/trap.h. * sysdeps/sparc/sparc32/Dist: Remove sys/trap.h. * sysdeps/sparc/sparc32/sparcv8/Dist: New file. * sysdeps/unix/sysv/linux/mips/Dist: Add sgidefs.h. * sysdeps/unix/sysv/linux/sparc/Dist: Add sys/trap.h. * sysdeps/unix/sysv/linux/sparc/sparc32/Dist: Remove sys/trap.h. Add previously missing assembler files for PPC. * sysdeps/powerpc/add_n.s: New file. * sysdeps/powerpc/addmul_1.s: New file. * sysdeps/powerpc/lshift.s: New file. * sysdeps/powerpc/memset.s: New file. * sysdeps/powerpc/mul_1.s: New file. * sysdeps/powerpc/rshift.s: New file. * sysdeps/powerpc/strchr.s: New file. * sysdeps/powerpc/strcmp.s: New file. * sysdeps/powerpc/sub_n.s: New file. * sysdeps/powerpc/submul_1.s: New file. 1997-08-28 18:42 Thorsten Kukuk <kukuk@uni-paderborn.de> * nis/nis_server.c: Rewritten to fix a lot of bugs. 1997-08-28 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * md5-crypt/Makefile (LDFLAGS-md5crypt.so, libmd5crypt-map): New variables. in NLSPATH environment variable. Patch by HJ Lu <hjl@gnu.ai.mit.edu>.
Diffstat (limited to 'sunrpc/svcauth_des.c')
-rw-r--r--sunrpc/svcauth_des.c548
1 files changed, 548 insertions, 0 deletions
diff --git a/sunrpc/svcauth_des.c b/sunrpc/svcauth_des.c
new file mode 100644
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--- /dev/null
+++ b/sunrpc/svcauth_des.c
@@ -0,0 +1,548 @@
+#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); /* initialize the cache */
+static short cache_spot (des_block *, char *, struct timeval *);
+ /* find an entry in the cache */
+static void cache_ref (short sid); /* note that sid was ref'd */
+
+static void invalidate (char *cred); /* 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)
+ {
+ sessionkey = &cred->adc_fullname.key;
+ if (key_decryptsession (cred->adc_fullname.name,
+ 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)
+ {
+ 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);
+ }
+ entry->rname = mem_alloc ((u_int) strlen (cred->adc_fullname.name)
+ + 1);
+ if (entry->rname != NULL)
+ {
+ strcpy (entry->rname, cred->adc_fullname.name);
+ }
+ 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
+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
+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
+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
+invalidate (char *cred)
+{
+ if (cred == NULL)
+ {
+ return;
+ }
+ ((struct bsdcred *) cred)->grouplen = INVALID;
+}