4 Copyright (c) 2000 The Regents of the University of Michigan.
7 Copyright (c) 2000 Dug Song <dugsong@UMICH.EDU>.
8 All rights reserved, all wrongs reversed.
10 Redistribution and use in source and binary forms, with or without
11 modification, are permitted provided that the following conditions
14 1. Redistributions of source code must retain the above copyright
15 notice, this list of conditions and the following disclaimer.
16 2. Redistributions in binary form must reproduce the above copyright
17 notice, this list of conditions and the following disclaimer in the
18 documentation and/or other materials provided with the distribution.
19 3. Neither the name of the University nor the names of its
20 contributors may be used to endorse or promote products derived
21 from this software without specific prior written permission.
23 THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
24 WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
25 MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
26 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
28 CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
29 SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
30 BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
31 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
32 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
33 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
41 #include <gssapi/gssapi.h>
43 extern SVCAUTH svc_auth_none
;
46 * from mit-krb5-1.2.1 mechglue/mglueP.h:
47 * Array of context IDs typed by mechanism OID
49 typedef struct gss_union_ctx_id_t
{
51 gss_ctx_id_t internal_ctx_id
;
52 } gss_union_ctx_id_desc
, *gss_union_ctx_id_t
;
56 static bool_t
svcauth_gss_destroy();
57 static bool_t
svcauth_gss_wrap();
58 static bool_t
svcauth_gss_unwrap();
60 struct svc_auth_ops svc_auth_gss_ops
= {
66 struct svc_rpc_gss_data
{
67 bool_t established
; /* context established */
68 gss_ctx_id_t ctx
; /* context id */
69 struct rpc_gss_sec sec
; /* security triple */
70 gss_buffer_desc cname
; /* GSS client name */
71 u_int seq
; /* sequence number */
72 u_int win
; /* sequence window */
73 u_int seqlast
; /* last sequence number */
74 u_int32_t seqmask
; /* bitmask of seqnums */
75 gss_name_t client_name
; /* unparsed name string */
78 #define SVCAUTH_PRIVATE(auth) \
79 ((struct svc_rpc_gss_data *)(auth)->svc_ah_private)
81 /* Global server credentials. */
82 gss_cred_id_t _svcauth_gss_creds
;
83 static gss_name_t _svcauth_gss_name
= NULL
;
86 svcauth_gss_set_svc_name(gss_name_t name
)
88 OM_uint32 maj_stat
, min_stat
;
90 log_debug("in svcauth_gss_set_svc_name()");
92 if (_svcauth_gss_name
!= NULL
) {
93 maj_stat
= gss_release_name(&min_stat
, &_svcauth_gss_name
);
95 if (maj_stat
!= GSS_S_COMPLETE
) {
96 log_status("gss_release_name", maj_stat
, min_stat
);
99 _svcauth_gss_name
= NULL
;
101 maj_stat
= gss_duplicate_name(&min_stat
, name
, &_svcauth_gss_name
);
103 if (maj_stat
!= GSS_S_COMPLETE
) {
104 log_status("gss_duplicate_name", maj_stat
, min_stat
);
112 svcauth_gss_import_name(char *service
)
115 gss_buffer_desc namebuf
;
116 OM_uint32 maj_stat
, min_stat
;
118 log_debug("in svcauth_gss_import_name()");
120 namebuf
.value
= service
;
121 namebuf
.length
= strlen(service
);
123 maj_stat
= gss_import_name(&min_stat
, &namebuf
,
124 (gss_OID
)GSS_C_NT_HOSTBASED_SERVICE
, &name
);
126 if (maj_stat
!= GSS_S_COMPLETE
) {
127 log_status("gss_import_name", maj_stat
, min_stat
);
130 if (svcauth_gss_set_svc_name(name
) != TRUE
) {
131 gss_release_name(&min_stat
, &name
);
138 svcauth_gss_acquire_cred(void)
140 OM_uint32 maj_stat
, min_stat
;
142 log_debug("in svcauth_gss_acquire_cred()");
144 maj_stat
= gss_acquire_cred(&min_stat
, _svcauth_gss_name
, 0,
145 GSS_C_NULL_OID_SET
, GSS_C_ACCEPT
,
146 &_svcauth_gss_creds
, NULL
, NULL
);
148 if (maj_stat
!= GSS_S_COMPLETE
) {
149 log_status("gss_acquire_cred", maj_stat
, min_stat
);
156 svcauth_gss_release_cred(void)
158 OM_uint32 maj_stat
, min_stat
;
160 log_debug("in svcauth_gss_release_cred()");
162 maj_stat
= gss_release_cred(&min_stat
, &_svcauth_gss_creds
);
164 if (maj_stat
!= GSS_S_COMPLETE
) {
165 log_status("gss_release_cred", maj_stat
, min_stat
);
169 _svcauth_gss_creds
= NULL
;
175 svcauth_gss_accept_sec_context(struct svc_req
*rqst
,
176 struct rpc_gss_init_res
*gr
)
178 struct svc_rpc_gss_data
*gd
;
179 struct rpc_gss_cred
*gc
;
180 gss_buffer_desc recv_tok
, seqbuf
, checksum
;
182 OM_uint32 maj_stat
= 0, min_stat
= 0, ret_flags
, seq
;
184 log_debug("in svcauth_gss_accept_context()");
186 gd
= SVCAUTH_PRIVATE(rqst
->rq_xprt
->xp_auth
);
187 gc
= (struct rpc_gss_cred
*)rqst
->rq_clntcred
;
188 memset(gr
, 0, sizeof(*gr
));
190 /* Deserialize arguments. */
191 memset(&recv_tok
, 0, sizeof(recv_tok
));
193 if (!svc_getargs(rqst
->rq_xprt
, (xdrproc_t
)xdr_rpc_gss_init_args
,
197 gr
->gr_major
= gss_accept_sec_context(&gr
->gr_minor
,
201 GSS_C_NO_CHANNEL_BINDINGS
,
209 if (gr
->gr_major
!= GSS_S_COMPLETE
&&
210 gr
->gr_major
!= GSS_S_CONTINUE_NEEDED
) {
211 log_status("accept_sec_context", gr
->gr_major
, gr
->gr_minor
);
212 gd
->ctx
= GSS_C_NO_CONTEXT
;
213 gss_release_buffer(&min_stat
, &gr
->gr_token
);
216 /* ANDROS: krb5 mechglue returns ctx of size 8 - two pointers,
217 * one to the mechanism oid, one to the internal_ctx_id */
218 if ((gr
->gr_ctx
.value
= mem_alloc(sizeof(gss_union_ctx_id_desc
))) == NULL
) {
219 fprintf(stderr
, "svcauth_gss_accept_context: out of memory\n");
222 memcpy(gr
->gr_ctx
.value
, gd
->ctx
, sizeof(gss_union_ctx_id_desc
));
223 gr
->gr_ctx
.length
= sizeof(gss_union_ctx_id_desc
);
225 /* ANDROS: change for debugging linux kernel version...
226 gr->gr_win = sizeof(gd->seqmask) * 8;
228 gr
->gr_win
= 0x00000005;
230 /* Save client info. */
232 gd
->sec
.qop
= GSS_C_QOP_DEFAULT
;
233 gd
->sec
.svc
= gc
->gc_svc
;
234 gd
->seq
= gc
->gc_seq
;
235 gd
->win
= gr
->gr_win
;
237 if (gr
->gr_major
== GSS_S_COMPLETE
) {
238 maj_stat
= gss_display_name(&min_stat
, gd
->client_name
,
239 &gd
->cname
, &gd
->sec
.mech
);
240 if (maj_stat
!= GSS_S_COMPLETE
) {
241 log_status("display_name", maj_stat
, min_stat
);
247 gss_buffer_desc mechname
;
249 gss_oid_to_str(&min_stat
, mech
, &mechname
);
251 log_debug("accepted context for %.*s with "
252 "<mech %.*s, qop %d, svc %d>",
253 gd
->cname
.length
, (char *)gd
->cname
.value
,
254 mechname
.length
, (char *)mechname
.value
,
255 gd
->sec
.qop
, gd
->sec
.svc
);
257 gss_release_buffer(&min_stat
, &mechname
);
260 log_debug("accepted context for %.*s with "
261 "<mech {}, qop %d, svc %d>",
262 gd
->cname
.length
, (char *)gd
->cname
.value
,
263 gd
->sec
.qop
, gd
->sec
.svc
);
266 seq
= htonl(gr
->gr_win
);
268 seqbuf
.length
= sizeof(seq
);
270 maj_stat
= gss_sign(&min_stat
, gd
->ctx
, GSS_C_QOP_DEFAULT
,
273 if (maj_stat
!= GSS_S_COMPLETE
)
276 rqst
->rq_xprt
->xp_verf
.oa_flavor
= RPCSEC_GSS
;
277 rqst
->rq_xprt
->xp_verf
.oa_base
= checksum
.value
;
278 rqst
->rq_xprt
->xp_verf
.oa_length
= checksum
.length
;
284 svcauth_gss_validate(struct svc_rpc_gss_data
*gd
, struct rpc_msg
*msg
)
286 struct opaque_auth
*oa
;
287 gss_buffer_desc rpcbuf
, checksum
;
288 OM_uint32 maj_stat
, min_stat
, qop_state
;
292 log_debug("in svcauth_gss_validate()");
294 memset(rpchdr
, 0, sizeof(rpchdr
));
296 /* XXX - Reconstruct RPC header for signing (from xdr_callmsg). */
297 oa
= &msg
->rm_call
.cb_cred
;
298 if (oa
->oa_length
> MAX_AUTH_BYTES
)
301 /* 8 XDR units from the IXDR macro calls. */
302 if (sizeof(rpchdr
) < (8 * BYTES_PER_XDR_UNIT
+
303 RNDUP(oa
->oa_length
)))
306 buf
= (int32_t *)rpchdr
;
307 IXDR_PUT_LONG(buf
, msg
->rm_xid
);
308 IXDR_PUT_ENUM(buf
, msg
->rm_direction
);
309 IXDR_PUT_LONG(buf
, msg
->rm_call
.cb_rpcvers
);
310 IXDR_PUT_LONG(buf
, msg
->rm_call
.cb_prog
);
311 IXDR_PUT_LONG(buf
, msg
->rm_call
.cb_vers
);
312 IXDR_PUT_LONG(buf
, msg
->rm_call
.cb_proc
);
313 IXDR_PUT_ENUM(buf
, oa
->oa_flavor
);
314 IXDR_PUT_LONG(buf
, oa
->oa_length
);
316 memcpy((caddr_t
)buf
, oa
->oa_base
, oa
->oa_length
);
317 buf
+= RNDUP(oa
->oa_length
) / sizeof(int32_t);
319 rpcbuf
.value
= rpchdr
;
320 rpcbuf
.length
= (u_char
*)buf
- rpchdr
;
322 checksum
.value
= msg
->rm_call
.cb_verf
.oa_base
;
323 checksum
.length
= msg
->rm_call
.cb_verf
.oa_length
;
325 maj_stat
= gss_verify_mic(&min_stat
, gd
->ctx
, &rpcbuf
, &checksum
,
328 if (maj_stat
!= GSS_S_COMPLETE
) {
329 log_status("gss_verify_mic", maj_stat
, min_stat
);
336 svcauth_gss_nextverf(struct svc_req
*rqst
, u_int num
)
338 struct svc_rpc_gss_data
*gd
;
339 gss_buffer_desc signbuf
, checksum
;
340 OM_uint32 maj_stat
, min_stat
;
342 log_debug("in svcauth_gss_nextverf()");
344 if (rqst
->rq_xprt
->xp_auth
== NULL
)
347 gd
= SVCAUTH_PRIVATE(rqst
->rq_xprt
->xp_auth
);
349 signbuf
.value
= &num
;
350 signbuf
.length
= sizeof(num
);
352 maj_stat
= gss_get_mic(&min_stat
, gd
->ctx
, gd
->sec
.qop
,
353 &signbuf
, &checksum
);
355 if (maj_stat
!= GSS_S_COMPLETE
) {
356 log_status("gss_get_mic", maj_stat
, min_stat
);
359 rqst
->rq_xprt
->xp_verf
.oa_flavor
= RPCSEC_GSS
;
360 rqst
->rq_xprt
->xp_verf
.oa_base
= (caddr_t
)checksum
.value
;
361 rqst
->rq_xprt
->xp_verf
.oa_length
= (u_int
)checksum
.length
;
367 _svcauth_gss(struct svc_req
*rqst
, struct rpc_msg
*msg
, bool_t
*no_dispatch
)
371 struct svc_rpc_gss_data
*gd
;
372 struct rpc_gss_cred
*gc
;
373 struct rpc_gss_init_res gr
;
374 int call_stat
, offset
;
376 log_debug("in svcauth_gss()");
378 /* Initialize reply. */
379 rqst
->rq_xprt
->xp_verf
= _null_auth
;
381 /* Allocate and set up server auth handle. */
382 if (rqst
->rq_xprt
->xp_auth
== NULL
||
383 rqst
->rq_xprt
->xp_auth
== &svc_auth_none
) {
384 if ((auth
= calloc(sizeof(*auth
), 1)) == NULL
) {
385 fprintf(stderr
, "svcauth_gss: out_of_memory\n");
386 return (AUTH_FAILED
);
388 if ((gd
= calloc(sizeof(*gd
), 1)) == NULL
) {
389 fprintf(stderr
, "svcauth_gss: out_of_memory\n");
390 return (AUTH_FAILED
);
392 auth
->svc_ah_ops
= &svc_auth_gss_ops
;
393 auth
->svc_ah_private
= (caddr_t
) gd
;
394 rqst
->rq_xprt
->xp_auth
= auth
;
396 else gd
= SVCAUTH_PRIVATE(rqst
->rq_xprt
->xp_auth
);
398 /* Deserialize client credentials. */
399 if (rqst
->rq_cred
.oa_length
<= 0)
400 return (AUTH_BADCRED
);
402 gc
= (struct rpc_gss_cred
*)rqst
->rq_clntcred
;
403 memset(gc
, 0, sizeof(*gc
));
405 xdrmem_create(&xdrs
, rqst
->rq_cred
.oa_base
,
406 rqst
->rq_cred
.oa_length
, XDR_DECODE
);
408 if (!xdr_rpc_gss_cred(&xdrs
, gc
)) {
410 return (AUTH_BADCRED
);
415 if (gc
->gc_v
!= RPCSEC_GSS_VERSION
)
416 return (AUTH_BADCRED
);
418 /* Check RPCSEC_GSS service. */
419 if (gc
->gc_svc
!= RPCSEC_GSS_SVC_NONE
&&
420 gc
->gc_svc
!= RPCSEC_GSS_SVC_INTEGRITY
&&
421 gc
->gc_svc
!= RPCSEC_GSS_SVC_PRIVACY
)
422 return (AUTH_BADCRED
);
424 /* Check sequence number. */
425 if (gd
->established
) {
426 if (gc
->gc_seq
> MAXSEQ
)
427 return (RPCSEC_GSS_CTXPROBLEM
);
429 if ((offset
= gd
->seqlast
- gc
->gc_seq
) < 0) {
430 gd
->seqlast
= gc
->gc_seq
;
432 gd
->seqmask
<<= offset
;
435 else if (offset
>= gd
->win
|| (gd
->seqmask
& (1 << offset
))) {
437 return (RPCSEC_GSS_CTXPROBLEM
);
439 gd
->seq
= gc
->gc_seq
;
440 gd
->seqmask
|= (1 << offset
);
443 if (gd
->established
) {
444 rqst
->rq_clntname
= (char *)gd
->client_name
;
445 rqst
->rq_svcname
= (char *)gd
->ctx
;
448 /* Handle RPCSEC_GSS control procedure. */
449 switch (gc
->gc_proc
) {
451 case RPCSEC_GSS_INIT
:
452 case RPCSEC_GSS_CONTINUE_INIT
:
453 if (rqst
->rq_proc
!= NULLPROC
)
454 return (AUTH_FAILED
); /* XXX ? */
456 if (_svcauth_gss_name
== NULL
) {
457 if (!svcauth_gss_import_name("nfs"))
458 return (AUTH_FAILED
);
461 if (!svcauth_gss_acquire_cred())
462 return (AUTH_FAILED
);
464 if (!svcauth_gss_accept_sec_context(rqst
, &gr
))
465 return (AUTH_REJECTEDCRED
);
467 if (!svcauth_gss_nextverf(rqst
, htonl(gr
.gr_win
)))
468 return (AUTH_FAILED
);
472 call_stat
= svc_sendreply(rqst
->rq_xprt
,
473 (xdrproc_t
)xdr_rpc_gss_init_res
, (caddr_t
)&gr
);
476 return (AUTH_FAILED
);
478 if (gr
.gr_major
== GSS_S_COMPLETE
)
479 gd
->established
= TRUE
;
483 case RPCSEC_GSS_DATA
:
484 if (!svcauth_gss_validate(gd
, msg
))
485 return (RPCSEC_GSS_CREDPROBLEM
);
487 if (!svcauth_gss_nextverf(rqst
, htonl(gc
->gc_seq
)))
488 return (AUTH_FAILED
);
491 case RPCSEC_GSS_DESTROY
:
492 if (rqst
->rq_proc
!= NULLPROC
)
493 return (AUTH_FAILED
); /* XXX ? */
495 if (!svcauth_gss_validate(gd
, msg
))
496 return (RPCSEC_GSS_CREDPROBLEM
);
498 if (!svcauth_gss_nextverf(rqst
, htonl(gc
->gc_seq
)))
499 return (AUTH_FAILED
);
501 if (!svcauth_gss_release_cred())
502 return (AUTH_FAILED
);
504 SVCAUTH_DESTROY(rqst
->rq_xprt
->xp_auth
);
505 rqst
->rq_xprt
->xp_auth
= &svc_auth_none
;
510 return (AUTH_REJECTEDCRED
);
517 svcauth_gss_destroy(SVCAUTH
*auth
)
519 struct svc_rpc_gss_data
*gd
;
522 log_debug("in svcauth_gss_destroy()");
524 gd
= SVCAUTH_PRIVATE(auth
);
526 gss_delete_sec_context(&min_stat
, &gd
->ctx
, GSS_C_NO_BUFFER
);
527 gss_release_buffer(&min_stat
, &gd
->cname
);
530 gss_release_name(&min_stat
, &gd
->client_name
);
532 mem_free(gd
, sizeof(*gd
));
533 mem_free(auth
, sizeof(*auth
));
539 svcauth_gss_wrap(SVCAUTH
*auth
, XDR
*xdrs
, xdrproc_t xdr_func
, caddr_t xdr_ptr
)
541 struct svc_rpc_gss_data
*gd
;
543 log_debug("in svcauth_gss_wrap()");
545 gd
= SVCAUTH_PRIVATE(auth
);
547 if (!gd
->established
|| gd
->sec
.svc
== RPCSEC_GSS_SVC_NONE
) {
548 return ((*xdr_func
)(xdrs
, xdr_ptr
));
550 return (xdr_rpc_gss_data(xdrs
, xdr_func
, xdr_ptr
,
551 gd
->ctx
, gd
->sec
.qop
,
552 gd
->sec
.svc
, gd
->seq
));
556 svcauth_gss_unwrap(SVCAUTH
*auth
, XDR
*xdrs
, xdrproc_t xdr_func
, caddr_t xdr_ptr
)
558 struct svc_rpc_gss_data
*gd
;
560 log_debug("in svcauth_gss_unwrap()");
562 gd
= SVCAUTH_PRIVATE(auth
);
564 if (!gd
->established
|| gd
->sec
.svc
== RPCSEC_GSS_SVC_NONE
) {
565 return ((*xdr_func
)(xdrs
, xdr_ptr
));
567 return (xdr_rpc_gss_data(xdrs
, xdr_func
, xdr_ptr
,
568 gd
->ctx
, gd
->sec
.qop
,
569 gd
->sec
.svc
, gd
->seq
));
573 svcauth_gss_get_principal(SVCAUTH
*auth
)
575 struct svc_rpc_gss_data
*gd
;
578 gd
= SVCAUTH_PRIVATE(auth
);
580 if (gd
->cname
.length
== 0)
583 if ((pname
= malloc(gd
->cname
.length
+ 1)) == NULL
)
586 memcpy(pname
, gd
->cname
.value
, gd
->cname
.length
);
587 pname
[gd
->cname
.length
] = '\0';