text: /*
   * 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) 1986-1991 by Sun Microsystems Inc. 
   */
  
  #ident	"@(#)key_call.c	1.25	94/04/24 SMI"
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD: soc2013/dpl/head/lib/libc/rpc/key_call.c 204993 2010-03-10 13:23:25Z jhb $");
  
  /*
   * key_call.c, Interface to keyserver
   *
   * setsecretkey(key) - set your secret key
   * encryptsessionkey(agent, deskey) - encrypt a session key to talk to agent
   * decryptsessionkey(agent, deskey) - decrypt ditto
   * gendeskey(deskey) - generate a secure des key
   */
  
  #include "namespace.h"
  #include "reentrant.h"
  #include <stdio.h>
  #include <stdlib.h>
  #include <unistd.h>
  #include <errno.h>
  #include <rpc/rpc.h>
  #include <rpc/auth.h>
  #include <rpc/auth_unix.h>
  #include <rpc/key_prot.h>
  #include <string.h>
  #include <netconfig.h>
  #include <sys/utsname.h>
  #include <stdlib.h>
  #include <signal.h>
  #include <sys/wait.h>
  #include <sys/fcntl.h>
  #include "un-namespace.h"
  #include "mt_misc.h"
  
  
  #define	KEY_TIMEOUT	5	/* per-try timeout in seconds */
  #define	KEY_NRETRY	12	/* number of retries */
  
  #ifdef DEBUG
  #define	debug(msg)	(void) fprintf(stderr, "%s\n", msg);
  #else
  #define	debug(msg)
  #endif /* DEBUG */
  
  /*
   * Hack to allow the keyserver to use AUTH_DES (for authenticated
   * NIS+ calls, for example).  The only functions that get called
   * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
   *
   * The approach is to have the keyserver fill in pointers to local
   * implementations of these functions, and to call those in key_call().
   */
  
  cryptkeyres *(*__key_encryptsession_pk_LOCAL)() = 0;
  cryptkeyres *(*__key_decryptsession_pk_LOCAL)() = 0;
  des_block *(*__key_gendes_LOCAL)() = 0;
  
  static int key_call( u_long, xdrproc_t, void *, xdrproc_t, void *);
  
  int
  key_setsecret(secretkey)
  	const char *secretkey;
  {
  	keystatus status;
  
  	if (!key_call((u_long) KEY_SET, (xdrproc_t)xdr_keybuf,
  			(void *)secretkey,
  			(xdrproc_t)xdr_keystatus, &status)) {
  		return (-1);
  	}
  	if (status != KEY_SUCCESS) {
  		debug("set status is nonzero");
  		return (-1);
  	}
  	return (0);
  }
  
  
  /* key_secretkey_is_set() returns 1 if the keyserver has a secret key
   * stored for the caller's effective uid; it returns 0 otherwise
   *
   * N.B.:  The KEY_NET_GET key call is undocumented.  Applications shouldn't
   * be using it, because it allows them to get the user's secret key.
   */
  
  int
  key_secretkey_is_set(void)
  {
  	struct key_netstres 	kres;
  
  	memset((void*)&kres, 0, sizeof (kres));
  	if (key_call((u_long) KEY_NET_GET, (xdrproc_t)xdr_void, NULL,
  			(xdrproc_t)xdr_key_netstres, &kres) &&
  	    (kres.status == KEY_SUCCESS) &&
  	    (kres.key_netstres_u.knet.st_priv_key[0] != 0)) {
  		/* avoid leaving secret key in memory */
  		memset(kres.key_netstres_u.knet.st_priv_key, 0, HEXKEYBYTES);
  		return (1);
  	}
  	return (0);
  }
  
  int
  key_encryptsession_pk(remotename, remotekey, deskey)
  	char *remotename;
  	netobj *remotekey;
  	des_block *deskey;
  {
  	cryptkeyarg2 arg;
  	cryptkeyres res;
  
  	arg.remotename = remotename;
  	arg.remotekey = *remotekey;
  	arg.deskey = *deskey;
  	if (!key_call((u_long)KEY_ENCRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
  			(xdrproc_t)xdr_cryptkeyres, &res)) {
  		return (-1);
  	}
  	if (res.status != KEY_SUCCESS) {
  		debug("encrypt status is nonzero");
  		return (-1);
  	}
  	*deskey = res.cryptkeyres_u.deskey;
  	return (0);
  }
  
  int
  key_decryptsession_pk(remotename, remotekey, deskey)
  	char *remotename;
  	netobj *remotekey;
  	des_block *deskey;
  {
  	cryptkeyarg2 arg;
  	cryptkeyres res;
  
  	arg.remotename = remotename;
  	arg.remotekey = *remotekey;
  	arg.deskey = *deskey;
  	if (!key_call((u_long)KEY_DECRYPT_PK, (xdrproc_t)xdr_cryptkeyarg2, &arg,
  			(xdrproc_t)xdr_cryptkeyres, &res)) {
  		return (-1);
  	}
  	if (res.status != KEY_SUCCESS) {
  		debug("decrypt status is nonzero");
  		return (-1);
  	}
  	*deskey = res.cryptkeyres_u.deskey;
  	return (0);
  }
  
  int
  key_encryptsession(remotename, deskey)
  	const char *remotename;
  	des_block *deskey;
  {
  	cryptkeyarg arg;
  	cryptkeyres res;
  
  	arg.remotename = (char *) remotename;
  	arg.deskey = *deskey;
  	if (!key_call((u_long)KEY_ENCRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
  			(xdrproc_t)xdr_cryptkeyres, &res)) {
  		return (-1);
  	}
  	if (res.status != KEY_SUCCESS) {
  		debug("encrypt status is nonzero");
  		return (-1);
  	}
  	*deskey = res.cryptkeyres_u.deskey;
  	return (0);
  }
  
  int
  key_decryptsession(remotename, deskey)
  	const char *remotename;
  	des_block *deskey;
  {
  	cryptkeyarg arg;
  	cryptkeyres res;
  
  	arg.remotename = (char *) remotename;
  	arg.deskey = *deskey;
  	if (!key_call((u_long)KEY_DECRYPT, (xdrproc_t)xdr_cryptkeyarg, &arg,
  			(xdrproc_t)xdr_cryptkeyres, &res)) {
  		return (-1);
  	}
  	if (res.status != KEY_SUCCESS) {
  		debug("decrypt status is nonzero");
  		return (-1);
  	}
  	*deskey = res.cryptkeyres_u.deskey;
  	return (0);
  }
  
  int
  key_gendes(key)
  	des_block *key;
  {
  	if (!key_call((u_long)KEY_GEN, (xdrproc_t)xdr_void, NULL,
  			(xdrproc_t)xdr_des_block, key)) {
  		return (-1);
  	}
  	return (0);
  }
  
  int
  key_setnet(arg)
  struct key_netstarg *arg;
  {
  	keystatus status;
  
  
  	if (!key_call((u_long) KEY_NET_PUT, (xdrproc_t)xdr_key_netstarg, arg,
  			(xdrproc_t)xdr_keystatus, &status)){
  		return (-1);
  	}
  
  	if (status != KEY_SUCCESS) {
  		debug("key_setnet status is nonzero");
  		return (-1);
  	}
  	return (1);
  }
  
  
  int
  key_get_conv(pkey, deskey)
  	char *pkey;
  	des_block *deskey;
  {
  	cryptkeyres res;
  
  	if (!key_call((u_long) KEY_GET_CONV, (xdrproc_t)xdr_keybuf, pkey,
  			(xdrproc_t)xdr_cryptkeyres, &res)) {
  		return (-1);
  	}
  	if (res.status != KEY_SUCCESS) {
  		debug("get_conv status is nonzero");
  		return (-1);
  	}
  	*deskey = res.cryptkeyres_u.deskey;
  	return (0);
  }
  
  struct  key_call_private {
  	CLIENT	*client;	/* Client handle */
  	pid_t	pid;		/* process-id at moment of creation */
  	uid_t	uid;		/* user-id at last authorization */
  };
  static struct key_call_private *key_call_private_main = NULL;
  static thread_key_t key_call_key;
  static once_t key_call_once = ONCE_INITIALIZER;
  static int key_call_key_error;
  
  static void
  key_call_destroy(void *vp)
  {
  	struct key_call_private *kcp = (struct key_call_private *)vp;
  
  	if (kcp) {
  		if (kcp->client)
  			clnt_destroy(kcp->client);
  		free(kcp);
  	}
  }
  
  static void
  key_call_init(void)
  {
  
  	key_call_key_error = thr_keycreate(&key_call_key, key_call_destroy);
  }
  
  /*
   * Keep the handle cached.  This call may be made quite often.
   */
  static CLIENT *
  getkeyserv_handle(vers)
  int	vers;
  {
  	void *localhandle;
  	struct netconfig *nconf;
  	struct netconfig *tpconf;
  	struct key_call_private *kcp;
  	struct timeval wait_time;
  	struct utsname u;
  	int main_thread;
  	int fd;
  
  #define	TOTAL_TIMEOUT	30	/* total timeout talking to keyserver */
  #define	TOTAL_TRIES	5	/* Number of tries */
  
  	if ((main_thread = thr_main())) {
  		kcp = key_call_private_main;
  	} else {
  		if (thr_once(&key_call_once, key_call_init) != 0 ||
  		    key_call_key_error != 0)
  			return ((CLIENT *) NULL);
  		kcp = (struct key_call_private *)thr_getspecific(key_call_key);
  	}	
  	if (kcp == (struct key_call_private *)NULL) {
  		kcp = (struct key_call_private *)malloc(sizeof (*kcp));
  		if (kcp == (struct key_call_private *)NULL) {
  			return ((CLIENT *) NULL);
  		}
                  if (main_thread)
                          key_call_private_main = kcp;
                  else
                          thr_setspecific(key_call_key, (void *) kcp);
  		kcp->client = NULL;
  	}
  
  	/* if pid has changed, destroy client and rebuild */
  	if (kcp->client != NULL && kcp->pid != getpid()) {
  		clnt_destroy(kcp->client);
  		kcp->client = NULL;
  	}
  
  	if (kcp->client != NULL) {
  		/* if uid has changed, build client handle again */
  		if (kcp->uid != geteuid()) {
  			kcp->uid = geteuid();
  			auth_destroy(kcp->client->cl_auth);
  			kcp->client->cl_auth =
  				authsys_create("", kcp->uid, 0, 0, NULL);
  			if (kcp->client->cl_auth == NULL) {
  				clnt_destroy(kcp->client);
  				kcp->client = NULL;
  				return ((CLIENT *) NULL);
  			}
  		}
  		/* Change the version number to the new one */
  		clnt_control(kcp->client, CLSET_VERS, (void *)&vers);
  		return (kcp->client);
  	}
  	if (!(localhandle = setnetconfig())) {
  		return ((CLIENT *) NULL);
  	}
          tpconf = NULL;
  #if defined(__FreeBSD__)
  	if (uname(&u) == -1)
  #else
  #if defined(i386)
  	if (_nuname(&u) == -1)
  #elif defined(sparc)
  	if (_uname(&u) == -1)
  #else
  #error Unknown architecture!
  #endif
  #endif
  	{
  		endnetconfig(localhandle);
  		return ((CLIENT *) NULL);
          }
  	while ((nconf = getnetconfig(localhandle)) != NULL) {
  		if (strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0) {
  			/*
  			 * We use COTS_ORD here so that the caller can
  			 * find out immediately if the server is dead.
  			 */
  			if (nconf->nc_semantics == NC_TPI_COTS_ORD) {
  				kcp->client = clnt_tp_create(u.nodename,
  					KEY_PROG, vers, nconf);
  				if (kcp->client)
  					break;
  			} else {
  				tpconf = nconf;
  			}
  		}
  	}
  	if ((kcp->client == (CLIENT *) NULL) && (tpconf))
  		/* Now, try the CLTS or COTS loopback transport */
  		kcp->client = clnt_tp_create(u.nodename,
  			KEY_PROG, vers, tpconf);
  	endnetconfig(localhandle);
  
  	if (kcp->client == (CLIENT *) NULL) {
  		return ((CLIENT *) NULL);
          }
  	kcp->uid = geteuid();
  	kcp->pid = getpid();
  	kcp->client->cl_auth = authsys_create("", kcp->uid, 0, 0, NULL);
  	if (kcp->client->cl_auth == NULL) {
  		clnt_destroy(kcp->client);
  		kcp->client = NULL;
  		return ((CLIENT *) NULL);
  	}
  
  	wait_time.tv_sec = TOTAL_TIMEOUT/TOTAL_TRIES;
  	wait_time.tv_usec = 0;
  	(void) clnt_control(kcp->client, CLSET_RETRY_TIMEOUT,
  		(char *)&wait_time);
  	if (clnt_control(kcp->client, CLGET_FD, (char *)&fd))
  		_fcntl(fd, F_SETFD, 1);	/* make it "close on exec" */
  
  	return (kcp->client);
  }
  
  /* returns  0 on failure, 1 on success */
  
  static int
  key_call(proc, xdr_arg, arg, xdr_rslt, rslt)
  	u_long proc;
  	xdrproc_t xdr_arg;
  	void *arg;
  	xdrproc_t xdr_rslt;
  	void *rslt;
  {
  	CLIENT *clnt;
  	struct timeval wait_time;
  
  	if (proc == KEY_ENCRYPT_PK && __key_encryptsession_pk_LOCAL) {
  		cryptkeyres *res;
  		res = (*__key_encryptsession_pk_LOCAL)(geteuid(), arg);
  		*(cryptkeyres*)rslt = *res;
  		return (1);
  	} else if (proc == KEY_DECRYPT_PK && __key_decryptsession_pk_LOCAL) {
  		cryptkeyres *res;
  		res = (*__key_decryptsession_pk_LOCAL)(geteuid(), arg);
  		*(cryptkeyres*)rslt = *res;
  		return (1);
  	} else if (proc == KEY_GEN && __key_gendes_LOCAL) {
  		des_block *res;
  		res = (*__key_gendes_LOCAL)(geteuid(), 0);
  		*(des_block*)rslt = *res;
  		return (1);
  	}
  
  	if ((proc == KEY_ENCRYPT_PK) || (proc == KEY_DECRYPT_PK) ||
  	    (proc == KEY_NET_GET) || (proc == KEY_NET_PUT) ||
  	    (proc == KEY_GET_CONV))
  		clnt = getkeyserv_handle(2); /* talk to version 2 */
  	else
  		clnt = getkeyserv_handle(1); /* talk to version 1 */
  
  	if (clnt == NULL) {
  		return (0);
  	}
  
  	wait_time.tv_sec = TOTAL_TIMEOUT;
  	wait_time.tv_usec = 0;
  
  	if (clnt_call(clnt, proc, xdr_arg, arg, xdr_rslt, rslt,
  		wait_time) == RPC_SUCCESS) {
  		return (1);
  	} else {
  		return (0);
  	}
  }
  