2 * Copyright (c) 2010, Oracle America, Inc.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
8 * * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following
12 * disclaimer in the documentation and/or other materials
13 * provided with the distribution.
14 * * Neither the name of the "Oracle America, Inc." nor the names of its
15 * contributors may be used to endorse or promote products derived
16 * from this software without specific prior written permission.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
21 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
22 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
23 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
25 * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
27 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * The original source is from the RPCSRC 4.0 package from Sun Microsystems.
33 * The Interface to keyserver protocoll 2, RPC over AF_UNIX and Linux/doors
34 * was added by Thorsten Kukuk <kukuk@suse.de>
35 * Since the Linux/doors project was stopped, I doubt that this code will
36 * ever be useful <kukuk@suse.de>.
48 #include <sys/param.h>
49 #include <sys/socket.h>
50 #include <rpc/key_prot.h>
51 #include <libc-lock.h>
53 #define KEY_TIMEOUT 5 /* per-try timeout in seconds */
54 #define KEY_NRETRY 12 /* number of retries */
56 #define debug(msg) /* turn off debugging */
59 extern int _openchild (const char *command
, FILE **fto
, FILE **ffrom
);
62 static int key_call (u_long
, xdrproc_t xdr_arg
, char *,
63 xdrproc_t xdr_rslt
, char *) internal_function
;
65 static const struct timeval trytimeout
= {KEY_TIMEOUT
, 0};
66 static const struct timeval tottimeout
= {KEY_TIMEOUT
*KEY_NRETRY
, 0};
69 key_setsecret (char *secretkey
)
73 if (!key_call ((u_long
) KEY_SET
, (xdrproc_t
) xdr_keybuf
, secretkey
,
74 (xdrproc_t
) xdr_keystatus
, (char *) &status
))
76 if (status
!= KEY_SUCCESS
)
78 debug ("set status is nonzero");
83 libc_hidden_nolink_sunrpc (key_setsecret
, GLIBC_2_1
)
85 /* key_secretkey_is_set() returns 1 if the keyserver has a secret key
86 * stored for the caller's effective uid; it returns 0 otherwise
88 * N.B.: The KEY_NET_GET key call is undocumented. Applications shouldn't
89 * be using it, because it allows them to get the user's secret key.
92 key_secretkey_is_set (void)
94 struct key_netstres kres
;
96 memset (&kres
, 0, sizeof (kres
));
97 if (key_call ((u_long
) KEY_NET_GET
, (xdrproc_t
) xdr_void
,
98 (char *) NULL
, (xdrproc_t
) xdr_key_netstres
,
100 (kres
.status
== KEY_SUCCESS
) &&
101 (kres
.key_netstres_u
.knet
.st_priv_key
[0] != 0))
103 /* avoid leaving secret key in memory */
104 memset (kres
.key_netstres_u
.knet
.st_priv_key
, 0, HEXKEYBYTES
);
109 #ifdef EXPORT_RPC_SYMBOLS
110 libc_hidden_def (key_secretkey_is_set
)
112 libc_hidden_nolink_sunrpc (key_secretkey_is_set
, GLIBC_2_1
)
116 key_encryptsession (char *remotename
, des_block
*deskey
)
121 arg
.remotename
= remotename
;
122 arg
.deskey
= *deskey
;
123 if (!key_call ((u_long
) KEY_ENCRYPT
, (xdrproc_t
) xdr_cryptkeyarg
,
124 (char *) &arg
, (xdrproc_t
) xdr_cryptkeyres
,
128 if (res
.status
!= KEY_SUCCESS
)
130 debug ("encrypt status is nonzero");
133 *deskey
= res
.cryptkeyres_u
.deskey
;
136 libc_hidden_nolink_sunrpc (key_encryptsession
, GLIBC_2_1
)
139 key_decryptsession (char *remotename
, des_block
*deskey
)
144 arg
.remotename
= remotename
;
145 arg
.deskey
= *deskey
;
146 if (!key_call ((u_long
) KEY_DECRYPT
, (xdrproc_t
) xdr_cryptkeyarg
,
147 (char *) &arg
, (xdrproc_t
) xdr_cryptkeyres
,
150 if (res
.status
!= KEY_SUCCESS
)
152 debug ("decrypt status is nonzero");
155 *deskey
= res
.cryptkeyres_u
.deskey
;
158 libc_hidden_nolink_sunrpc (key_decryptsession
, GLIBC_2_1
)
161 key_encryptsession_pk (char *remotename
, netobj
*remotekey
,
167 arg
.remotename
= remotename
;
168 arg
.remotekey
= *remotekey
;
169 arg
.deskey
= *deskey
;
170 if (!key_call ((u_long
) KEY_ENCRYPT_PK
, (xdrproc_t
) xdr_cryptkeyarg2
,
171 (char *) &arg
, (xdrproc_t
) xdr_cryptkeyres
,
175 if (res
.status
!= KEY_SUCCESS
)
177 debug ("encrypt status is nonzero");
180 *deskey
= res
.cryptkeyres_u
.deskey
;
183 libc_hidden_nolink_sunrpc (key_encryptsession_pk
, GLIBC_2_1
)
186 key_decryptsession_pk (char *remotename
, netobj
*remotekey
,
192 arg
.remotename
= remotename
;
193 arg
.remotekey
= *remotekey
;
194 arg
.deskey
= *deskey
;
195 if (!key_call ((u_long
) KEY_DECRYPT_PK
, (xdrproc_t
) xdr_cryptkeyarg2
,
196 (char *) &arg
, (xdrproc_t
) xdr_cryptkeyres
,
200 if (res
.status
!= KEY_SUCCESS
)
202 debug ("decrypt status is nonzero");
205 *deskey
= res
.cryptkeyres_u
.deskey
;
208 libc_hidden_nolink_sunrpc (key_decryptsession_pk
, GLIBC_2_1
)
211 key_gendes (des_block
*key
)
213 struct sockaddr_in sin
;
218 sin
.sin_family
= AF_INET
;
220 sin
.sin_addr
.s_addr
= htonl (INADDR_LOOPBACK
);
221 __bzero (sin
.sin_zero
, sizeof (sin
.sin_zero
));
222 socket
= RPC_ANYSOCK
;
223 client
= clntudp_bufcreate (&sin
, (u_long
) KEY_PROG
, (u_long
) KEY_VERS
,
224 trytimeout
, &socket
, RPCSMALLMSGSIZE
,
229 stat
= clnt_call (client
, KEY_GEN
, (xdrproc_t
) xdr_void
, NULL
,
230 (xdrproc_t
) xdr_des_block
, (caddr_t
) key
,
232 clnt_destroy (client
);
234 if (stat
!= RPC_SUCCESS
)
239 #ifdef EXPORT_RPC_SYMBOLS
240 libc_hidden_def (key_gendes
)
242 libc_hidden_nolink_sunrpc (key_gendes
, GLIBC_2_1
)
246 key_setnet (struct key_netstarg
*arg
)
250 if (!key_call ((u_long
) KEY_NET_PUT
, (xdrproc_t
) xdr_key_netstarg
,
251 (char *) arg
,(xdrproc_t
) xdr_keystatus
,
255 if (status
!= KEY_SUCCESS
)
257 debug ("key_setnet status is nonzero");
262 libc_hidden_nolink_sunrpc (key_setnet
, GLIBC_2_1
)
265 key_get_conv (char *pkey
, des_block
*deskey
)
269 if (!key_call ((u_long
) KEY_GET_CONV
, (xdrproc_t
) xdr_keybuf
, pkey
,
270 (xdrproc_t
) xdr_cryptkeyres
, (char *) &res
))
273 if (res
.status
!= KEY_SUCCESS
)
275 debug ("get_conv status is nonzero");
278 *deskey
= res
.cryptkeyres_u
.deskey
;
281 libc_hidden_nolink_sunrpc (key_get_conv
, GLIBC_2_1
)
284 * Hack to allow the keyserver to use AUTH_DES (for authenticated
285 * NIS+ calls, for example). The only functions that get called
286 * are key_encryptsession_pk, key_decryptsession_pk, and key_gendes.
288 * The approach is to have the keyserver fill in pointers to local
289 * implementations of these functions, and to call those in key_call().
292 cryptkeyres
*(*__key_encryptsession_pk_LOCAL
) (uid_t
, char *);
293 cryptkeyres
*(*__key_decryptsession_pk_LOCAL
) (uid_t
, char *);
294 des_block
*(*__key_gendes_LOCAL
) (uid_t
, char *);
299 key_call_keyenvoy (u_long proc
, xdrproc_t xdr_arg
, char *arg
,
300 xdrproc_t xdr_rslt
, char *rslt
)
306 sigset_t oldmask
, mask
;
312 static const char MESSENGER
[] = "/usr/etc/keyenvoy";
316 sigaddset (&mask
, SIGCHLD
);
317 __sigprocmask (SIG_BLOCK
, &mask
, &oldmask
);
320 * We are going to exec a set-uid program which makes our effective uid
321 * zero, and authenticates us with our real uid. We need to make the
322 * effective uid be the real uid for the setuid program, and
323 * the real uid be the effective uid so that we can change things back.
327 __setreuid (euid
, ruid
);
328 pid
= _openchild (MESSENGER
, &fargs
, &frslt
);
329 __setreuid (ruid
, euid
);
332 debug ("open_streams");
333 __sigprocmask (SIG_SETMASK
, &oldmask
, NULL
);
336 xdrstdio_create (&xdrargs
, fargs
, XDR_ENCODE
);
337 xdrstdio_create (&xdrrslt
, frslt
, XDR_DECODE
);
339 if (!xdr_u_long (&xdrargs
, &proc
) || !(*xdr_arg
) (&xdrargs
, arg
))
346 if (success
&& !(*xdr_rslt
) (&xdrrslt
, rslt
))
354 if (__wait4 (pid
, &status
, 0, NULL
) < 0)
359 if (errno
== ECHILD
|| errno
== ESRCH
)
365 if (status
.w_retcode
)
370 __sigprocmask (SIG_SETMASK
, &oldmask
, NULL
);
376 struct key_call_private
{
377 CLIENT
*client
; /* Client handle */
378 pid_t pid
; /* process-id at moment of creation */
379 uid_t uid
; /* user-id at last authorization */
381 #ifdef _RPC_THREAD_SAFE_
382 #define key_call_private_main RPC_THREAD_VARIABLE(key_call_private_s)
384 static struct key_call_private
*key_call_private_main
;
386 __libc_lock_define_initialized (static, keycall_lock
)
389 * Keep the handle cached. This call may be made quite often.
392 getkeyserv_handle (int vers
)
394 struct key_call_private
*kcp
= key_call_private_main
;
395 struct timeval wait_time
;
397 struct sockaddr_un name
;
398 socklen_t namelen
= sizeof(struct sockaddr_un
);
400 #define TOTAL_TIMEOUT 30 /* total timeout talking to keyserver */
401 #define TOTAL_TRIES 5 /* Number of tries */
403 if (kcp
== (struct key_call_private
*)NULL
)
405 kcp
= (struct key_call_private
*)malloc (sizeof (*kcp
));
406 if (kcp
== (struct key_call_private
*)NULL
)
407 return (CLIENT
*) NULL
;
409 key_call_private_main
= kcp
;
413 /* if pid has changed, destroy client and rebuild */
414 if (kcp
->client
!= NULL
&& kcp
->pid
!= __getpid ())
416 auth_destroy (kcp
->client
->cl_auth
);
417 clnt_destroy (kcp
->client
);
421 if (kcp
->client
!= NULL
)
423 /* if other side closed socket, build handle again */
424 clnt_control (kcp
->client
, CLGET_FD
, (char *)&fd
);
425 if (__getpeername (fd
,(struct sockaddr
*)&name
,&namelen
) == -1)
427 auth_destroy (kcp
->client
->cl_auth
);
428 clnt_destroy (kcp
->client
);
433 if (kcp
->client
!= NULL
)
435 /* if uid has changed, build client handle again */
436 if (kcp
->uid
!= __geteuid ())
438 kcp
->uid
= __geteuid ();
439 auth_destroy (kcp
->client
->cl_auth
);
440 kcp
->client
->cl_auth
=
441 authunix_create ((char *)"", kcp
->uid
, 0, 0, NULL
);
442 if (kcp
->client
->cl_auth
== NULL
)
444 clnt_destroy (kcp
->client
);
446 return ((CLIENT
*) NULL
);
449 /* Change the version number to the new one */
450 clnt_control (kcp
->client
, CLSET_VERS
, (void *)&vers
);
454 if ((kcp
->client
== (CLIENT
*) NULL
))
455 /* Use the AF_UNIX transport */
456 kcp
->client
= clnt_create ("/var/run/keyservsock", KEY_PROG
, vers
, "unix");
458 if (kcp
->client
== (CLIENT
*) NULL
)
459 return (CLIENT
*) NULL
;
461 kcp
->uid
= __geteuid ();
462 kcp
->pid
= __getpid ();
463 kcp
->client
->cl_auth
= authunix_create ((char *)"", kcp
->uid
, 0, 0, NULL
);
464 if (kcp
->client
->cl_auth
== NULL
)
466 clnt_destroy (kcp
->client
);
468 return (CLIENT
*) NULL
;
471 wait_time
.tv_sec
= TOTAL_TIMEOUT
/TOTAL_TRIES
;
472 wait_time
.tv_usec
= 0;
473 clnt_control (kcp
->client
, CLSET_RETRY_TIMEOUT
,
475 if (clnt_control (kcp
->client
, CLGET_FD
, (char *)&fd
))
476 __fcntl (fd
, F_SETFD
, FD_CLOEXEC
); /* make it "close on exec" */
481 /* returns 0 on failure, 1 on success */
484 key_call_socket (u_long proc
, xdrproc_t xdr_arg
, char *arg
,
485 xdrproc_t xdr_rslt
, char *rslt
)
488 struct timeval wait_time
;
491 __libc_lock_lock (keycall_lock
);
492 if ((proc
== KEY_ENCRYPT_PK
) || (proc
== KEY_DECRYPT_PK
) ||
493 (proc
== KEY_NET_GET
) || (proc
== KEY_NET_PUT
) ||
494 (proc
== KEY_GET_CONV
))
495 clnt
= getkeyserv_handle(2); /* talk to version 2 */
497 clnt
= getkeyserv_handle(1); /* talk to version 1 */
501 wait_time
.tv_sec
= TOTAL_TIMEOUT
;
502 wait_time
.tv_usec
= 0;
504 if (clnt_call (clnt
, proc
, xdr_arg
, arg
, xdr_rslt
, rslt
,
505 wait_time
) == RPC_SUCCESS
)
509 __libc_lock_unlock (keycall_lock
);
515 /* returns 0 on failure, 1 on success */
518 key_call (u_long proc
, xdrproc_t xdr_arg
, char *arg
,
519 xdrproc_t xdr_rslt
, char *rslt
)
522 static int use_keyenvoy
;
525 if (proc
== KEY_ENCRYPT_PK
&& __key_encryptsession_pk_LOCAL
)
528 res
= (*__key_encryptsession_pk_LOCAL
) (__geteuid (), arg
);
529 *(cryptkeyres
*) rslt
= *res
;
532 else if (proc
== KEY_DECRYPT_PK
&& __key_decryptsession_pk_LOCAL
)
535 res
= (*__key_decryptsession_pk_LOCAL
) (__geteuid (), arg
);
536 *(cryptkeyres
*) rslt
= *res
;
539 else if (proc
== KEY_GEN
&& __key_gendes_LOCAL
)
542 res
= (*__key_gendes_LOCAL
) (__geteuid (), 0);
543 *(des_block
*) rslt
= *res
;
548 return key_call_socket (proc
, xdr_arg
, arg
, xdr_rslt
, rslt
);
552 if (key_call_socket (proc
, xdr_arg
, arg
, xdr_rslt
, rslt
))
556 return key_call_keyenvoy (proc
, xdr_arg
, arg
, xdr_rslt
, rslt
);
560 #ifdef _RPC_THREAD_SAFE_
562 __rpc_thread_key_cleanup (void)
564 struct key_call_private
*kcp
= RPC_THREAD_VARIABLE(key_call_private_s
);
568 if (kcp
->client
->cl_auth
)
569 auth_destroy (kcp
->client
->cl_auth
);
570 clnt_destroy(kcp
->client
);
575 #endif /* _RPC_THREAD_SAFE_ */