/*
* Copyright (c) 2010, Oracle America, Inc.
*
* 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 the "Oracle America, 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.
*/
/*
* The original source is from the RPCSRC 4.0 package from Sun Microsystems.
* The Interface to keyserver protocoll 2, RPC over AF_UNIX and Linux/doors
* was added by Thorsten Kukuk <kukuk@suse.de>
* Since the Linux/doors project was stopped, I doubt that this code will
* ever be useful <kukuk@suse.de>.
*/
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <unistd.h>
#include <string.h>
#include <rpc/rpc.h>
#include <rpc/auth.h>
#include <sys/wait.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <rpc/key_prot.h>
#include <libc-lock.h>
#include <shlib-compat.h>
#define KEY_TIMEOUT 5 /* per-try timeout in seconds */
#define KEY_NRETRY 12 /* number of retries */
#define debug(msg) /* turn off debugging */
#ifndef SO_PASSCRED
extern int _openchild (const char *command, FILE **fto, FILE **ffrom);
#endif
static int key_call (u_long, xdrproc_t xdr_arg, char *,
xdrproc_t xdr_rslt, char *);
static const struct timeval trytimeout = {KEY_TIMEOUT, 0};
static const struct timeval tottimeout = {KEY_TIMEOUT *KEY_NRETRY, 0};
int
key_setsecret (char *secretkey)
{
keystatus status;
if (!key_call ((u_long) KEY_SET, (xdrproc_t) xdr_keybuf, secretkey,
(xdrproc_t) xdr_keystatus, (char *) &status))
return -1;
if (status != KEY_SUCCESS)
{
debug ("set status is nonzero");
return -1;
}
return 0;
}
libc_hidden_nolink_sunrpc (key_setsecret, GLIBC_2_1)
/* 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 (&kres, 0, sizeof (kres));
if (key_call ((u_long) KEY_NET_GET, (xdrproc_t) xdr_void,
(char *) NULL, (xdrproc_t) xdr_key_netstres,
(char *) &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;
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (key_secretkey_is_set)
#else
libc_hidden_nolink_sunrpc (key_secretkey_is_set, GLIBC_2_1)
#endif
int
key_encryptsession (char *remotename, des_block *deskey)
{
cryptkeyarg arg;
cryptkeyres res;
arg.remotename = remotename;
arg.deskey = *deskey;
if (!key_call ((u_long) KEY_ENCRYPT, (xdrproc_t) xdr_cryptkeyarg,
(char *) &arg, (xdrproc_t) xdr_cryptkeyres,
(char *) &res))
return -1;
if (res.status != KEY_SUCCESS)
{
debug ("encrypt status is nonzero");
return -1;
}
*deskey = res.cryptkeyres_u.deskey;
return 0;
}
libc_hidden_nolink_sunrpc (key_encryptsession, GLIBC_2_1)
int
key_decryptsession (char *remotename, des_block *deskey)
{
cryptkeyarg arg;
cryptkeyres res;
arg.remotename = remotename;
arg.deskey = *deskey;
if (!key_call ((u_long) KEY_DECRYPT, (xdrproc_t) xdr_cryptkeyarg,
(char *) &arg, (xdrproc_t) xdr_cryptkeyres,
(char *) &res))
return -1;
if (res.status != KEY_SUCCESS)
{
debug ("decrypt status is nonzero");
return -1;
}
*deskey = res.cryptkeyres_u.deskey;
return 0;
}
libc_hidden_nolink_sunrpc (key_decryptsession, GLIBC_2_1)
int
key_encryptsession_pk (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,
(char *) &arg, (xdrproc_t) xdr_cryptkeyres,
(char *) &res))
return -1;
if (res.status != KEY_SUCCESS)
{
debug ("encrypt status is nonzero");
return -1;
}
*deskey = res.cryptkeyres_u.deskey;
return 0;
}
libc_hidden_nolink_sunrpc (key_encryptsession_pk, GLIBC_2_1)
int
key_decryptsession_pk (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,
(char *) &arg, (xdrproc_t) xdr_cryptkeyres,
(char *) &res))
return -1;
if (res.status != KEY_SUCCESS)
{
debug ("decrypt status is nonzero");
return -1;
}
*deskey = res.cryptkeyres_u.deskey;
return 0;
}
libc_hidden_nolink_sunrpc (key_decryptsession_pk, GLIBC_2_1)
int
key_gendes (des_block *key)
{
struct sockaddr_in sin;
CLIENT *client;
int socket;
enum clnt_stat stat;
sin.sin_family = AF_INET;
sin.sin_port = 0;
sin.sin_addr.s_addr = htonl (INADDR_LOOPBACK);
memset (sin.sin_zero, 0, sizeof (sin.sin_zero));
socket = RPC_ANYSOCK;
client = clntudp_bufcreate (&sin, (u_long) KEY_PROG, (u_long) KEY_VERS,
trytimeout, &socket, RPCSMALLMSGSIZE,
RPCSMALLMSGSIZE);
if (client == NULL)
return -1;
stat = clnt_call (client, KEY_GEN, (xdrproc_t) xdr_void, NULL,
(xdrproc_t) xdr_des_block, (caddr_t) key,
tottimeout);
clnt_destroy (client);
__close (socket);
if (stat != RPC_SUCCESS)
return -1;
return 0;
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (key_gendes)
#else
libc_hidden_nolink_sunrpc (key_gendes, GLIBC_2_1)
#endif
int
key_setnet (struct key_netstarg *arg)
{
keystatus status;
if (!key_call ((u_long) KEY_NET_PUT, (xdrproc_t) xdr_key_netstarg,
(char *) arg,(xdrproc_t) xdr_keystatus,
(char *) &status))
return -1;
if (status != KEY_SUCCESS)
{
debug ("key_setnet status is nonzero");
return -1;
}
return 1;
}
libc_hidden_nolink_sunrpc (key_setnet, GLIBC_2_1)
int
key_get_conv (char *pkey, des_block *deskey)
{
cryptkeyres res;
if (!key_call ((u_long) KEY_GET_CONV, (xdrproc_t) xdr_keybuf, pkey,
(xdrproc_t) xdr_cryptkeyres, (char *) &res))
return -1;
if (res.status != KEY_SUCCESS)
{
debug ("get_conv status is nonzero");
return -1;
}
*deskey = res.cryptkeyres_u.deskey;
return 0;
}
libc_hidden_nolink_sunrpc (key_get_conv, GLIBC_2_1)
/*
* 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) (uid_t, char *);
cryptkeyres *(*__key_decryptsession_pk_LOCAL) (uid_t, char *);
des_block *(*__key_gendes_LOCAL) (uid_t, char *);
#ifndef SO_PASSCRED
static int
key_call_keyenvoy (u_long proc, xdrproc_t xdr_arg, char *arg,
xdrproc_t xdr_rslt, char *rslt)
{
XDR xdrargs;
XDR xdrrslt;
FILE *fargs;
FILE *frslt;
sigset_t oldmask, mask;
int status;
int pid;
int success;
uid_t ruid;
uid_t euid;
static const char MESSENGER[] = "/usr/etc/keyenvoy";
success = 1;
sigemptyset (&mask);
sigaddset (&mask, SIGCHLD);
__sigprocmask (SIG_BLOCK, &mask, &oldmask);
/*
* We are going to exec a set-uid program which makes our effective uid
* zero, and authenticates us with our real uid. We need to make the
* effective uid be the real uid for the setuid program, and
* the real uid be the effective uid so that we can change things back.
*/
euid = __geteuid ();
ruid = __getuid ();
__setreuid (euid, ruid);
pid = _openchild (MESSENGER, &fargs, &frslt);
__setreuid (ruid, euid);
if (pid < 0)
{
debug ("open_streams");
__sigprocmask (SIG_SETMASK, &oldmask, NULL);
return (0);
}
xdrstdio_create (&xdrargs, fargs, XDR_ENCODE);
xdrstdio_create (&xdrrslt, frslt, XDR_DECODE);
if (!xdr_u_long (&xdrargs, &proc) || !(*xdr_arg) (&xdrargs, arg))
{
debug ("xdr args");
success = 0;
}
fclose (fargs);
if (success && !(*xdr_rslt) (&xdrrslt, rslt))
{
debug ("xdr rslt");
success = 0;
}
fclose(frslt);
wait_again:
if (__wait4 (pid, &status, 0, NULL) < 0)
{
if (errno == EINTR)
goto wait_again;
debug ("wait4");
if (errno == ECHILD || errno == ESRCH)
perror ("wait");
else
success = 0;
}
else
if (status != 0)
{
debug ("wait4 1");
success = 0;
}
__sigprocmask (SIG_SETMASK, &oldmask, NULL);
return success;
}
#endif
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 */
};
#define key_call_private_main RPC_THREAD_VARIABLE(key_call_private_s)
__libc_lock_define_initialized (static, keycall_lock)
/*
* Keep the handle cached. This call may be made quite often.
*/
static CLIENT *
getkeyserv_handle (int vers)
{
struct key_call_private *kcp = key_call_private_main;
struct timeval wait_time;
int fd;
struct sockaddr_un name;
socklen_t namelen = sizeof(struct sockaddr_un);
#define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
#define TOTAL_TRIES 5 /* Number of tries */
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;
key_call_private_main = kcp;
kcp->client = NULL;
}
/* if pid has changed, destroy client and rebuild */
if (kcp->client != NULL && kcp->pid != __getpid ())
{
auth_destroy (kcp->client->cl_auth);
clnt_destroy (kcp->client);
kcp->client = NULL;
}
if (kcp->client != NULL)
{
/* if other side closed socket, build handle again */
clnt_control (kcp->client, CLGET_FD, (char *)&fd);
if (__getpeername (fd,(struct sockaddr *)&name,&namelen) == -1)
{
auth_destroy (kcp->client->cl_auth);
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 =
authunix_create ((char *)"", 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 ((kcp->client == (CLIENT *) NULL))
/* Use the AF_UNIX transport */
kcp->client = clnt_create ("/var/run/keyservsock", KEY_PROG, vers, "unix");
if (kcp->client == (CLIENT *) NULL)
return (CLIENT *) NULL;
kcp->uid = __geteuid ();
kcp->pid = __getpid ();
kcp->client->cl_auth = authunix_create ((char *)"", 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;
clnt_control (kcp->client, CLSET_RETRY_TIMEOUT,
(char *)&wait_time);
if (clnt_control (kcp->client, CLGET_FD, (char *)&fd))
__fcntl (fd, F_SETFD, FD_CLOEXEC); /* make it "close on exec" */
return kcp->client;
}
/* returns 0 on failure, 1 on success */
static int
key_call_socket (u_long proc, xdrproc_t xdr_arg, char *arg,
xdrproc_t xdr_rslt, char *rslt)
{
CLIENT *clnt;
struct timeval wait_time;
int result = 0;
__libc_lock_lock (keycall_lock);
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)
{
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)
result = 1;
}
__libc_lock_unlock (keycall_lock);
return result;
}
/* returns 0 on failure, 1 on success */
static int
key_call (u_long proc, xdrproc_t xdr_arg, char *arg,
xdrproc_t xdr_rslt, char *rslt)
{
#ifndef SO_PASSCRED
static int use_keyenvoy;
#endif
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;
}
#ifdef SO_PASSCRED
return key_call_socket (proc, xdr_arg, arg, xdr_rslt, rslt);
#else
if (!use_keyenvoy)
{
if (key_call_socket (proc, xdr_arg, arg, xdr_rslt, rslt))
return 1;
use_keyenvoy = 1;
}
return key_call_keyenvoy (proc, xdr_arg, arg, xdr_rslt, rslt);
#endif
}
void
__rpc_thread_key_cleanup (void)
{
struct key_call_private *kcp = RPC_THREAD_VARIABLE(key_call_private_s);
if (kcp) {
if (kcp->client) {
if (kcp->client->cl_auth)
auth_destroy (kcp->client->cl_auth);
clnt_destroy(kcp->client);
}
free (kcp);
}
}