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_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, 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 buf = (int32_t *)rpchdr;
298 IXDR_PUT_LONG(buf, msg->rm_xid);
299 IXDR_PUT_ENUM(buf, msg->rm_direction);
300 IXDR_PUT_LONG(buf, msg->rm_call.cb_rpcvers);
301 IXDR_PUT_LONG(buf, msg->rm_call.cb_prog);
302 IXDR_PUT_LONG(buf, msg->rm_call.cb_vers);
303 IXDR_PUT_LONG(buf, msg->rm_call.cb_proc);
304 oa = &msg->rm_call.cb_cred;
305 IXDR_PUT_ENUM(buf, oa->oa_flavor);
306 IXDR_PUT_LONG(buf, oa->oa_length);
308 memcpy((caddr_t)buf, oa->oa_base, oa->oa_length);
309 buf += RNDUP(oa->oa_length) / sizeof(int32_t);
311 rpcbuf.value = rpchdr;
312 rpcbuf.length = (u_char *)buf - rpchdr;
314 checksum.value = msg->rm_call.cb_verf.oa_base;
315 checksum.length = msg->rm_call.cb_verf.oa_length;
317 maj_stat = gss_verify_mic(&min_stat, gd->ctx, &rpcbuf, &checksum,
320 if (maj_stat != GSS_S_COMPLETE) {
321 log_status("gss_verify_mic", maj_stat, min_stat);
328 svcauth_gss_nextverf(struct svc_req *rqst, u_int num)
330 struct svc_rpc_gss_data *gd;
331 gss_buffer_desc signbuf, checksum;
332 OM_uint32 maj_stat, min_stat;
334 log_debug("in svcauth_gss_nextverf()");
336 if (rqst->rq_xprt->xp_auth == NULL)
339 gd = SVCAUTH_PRIVATE(rqst->rq_xprt->xp_auth);
341 signbuf.value = #
342 signbuf.length = sizeof(num);
344 maj_stat = gss_get_mic(&min_stat, gd->ctx, gd->sec.qop,
345 &signbuf, &checksum);
347 if (maj_stat != GSS_S_COMPLETE) {
348 log_status("gss_get_mic", maj_stat, min_stat);
351 rqst->rq_xprt->xp_verf.oa_flavor = RPCSEC_GSS;
352 rqst->rq_xprt->xp_verf.oa_base = (caddr_t)checksum.value;
353 rqst->rq_xprt->xp_verf.oa_length = (u_int)checksum.length;
359 _svcauth_gss(struct svc_req *rqst, struct rpc_msg *msg, bool_t *no_dispatch)
363 struct svc_rpc_gss_data *gd;
364 struct rpc_gss_cred *gc;
365 struct rpc_gss_init_res gr;
366 int call_stat, offset;
368 log_debug("in svcauth_gss()");
370 /* Initialize reply. */
371 rqst->rq_xprt->xp_verf = _null_auth;
373 /* Allocate and set up server auth handle. */
374 if (rqst->rq_xprt->xp_auth == NULL ||
375 rqst->rq_xprt->xp_auth == &svc_auth_none) {
376 if ((auth = calloc(sizeof(*auth), 1)) == NULL) {
377 fprintf(stderr, "svcauth_gss: out_of_memory\n");
378 return (AUTH_FAILED);
380 if ((gd = calloc(sizeof(*gd), 1)) == NULL) {
381 fprintf(stderr, "svcauth_gss: out_of_memory\n");
382 return (AUTH_FAILED);
384 auth->svc_ah_ops = &svc_auth_gss_ops;
385 auth->svc_ah_private = (caddr_t)gd;
386 rqst->rq_xprt->xp_auth = auth;
388 else gd = SVCAUTH_PRIVATE(rqst->rq_xprt->xp_auth);
390 /* Deserialize client credentials. */
391 if (rqst->rq_cred.oa_length <= 0)
392 return (AUTH_BADCRED);
394 gc = (struct rpc_gss_cred *)rqst->rq_clntcred;
395 memset(gc, 0, sizeof(*gc));
397 xdrmem_create(&xdrs, rqst->rq_cred.oa_base,
398 rqst->rq_cred.oa_length, XDR_DECODE);
400 if (!xdr_rpc_gss_cred(&xdrs, gc)) {
402 return (AUTH_BADCRED);
407 if (gc->gc_v != RPCSEC_GSS_VERSION)
408 return (AUTH_BADCRED);
410 /* Check RPCSEC_GSS service. */
411 if (gc->gc_svc != RPCSEC_GSS_SVC_NONE &&
412 gc->gc_svc != RPCSEC_GSS_SVC_INTEGRITY &&
413 gc->gc_svc != RPCSEC_GSS_SVC_PRIVACY)
414 return (AUTH_BADCRED);
416 /* Check sequence number. */
417 if (gd->established) {
418 if (gc->gc_seq > MAXSEQ)
419 return (RPCSEC_GSS_CTXPROBLEM);
421 if ((offset = gd->seqlast - gc->gc_seq) < 0) {
422 gd->seqlast = gc->gc_seq;
424 gd->seqmask <<= offset;
427 else if (offset >= gd->win || (gd->seqmask & (1 << offset))) {
429 return (RPCSEC_GSS_CTXPROBLEM);
431 gd->seq = gc->gc_seq;
432 gd->seqmask |= (1 << offset);
435 if (gd->established) {
436 rqst->rq_clntname = (char *)gd->client_name;
437 rqst->rq_svcname = (char *)gd->ctx;
440 /* Handle RPCSEC_GSS control procedure. */
441 switch (gc->gc_proc) {
443 case RPCSEC_GSS_INIT:
444 case RPCSEC_GSS_CONTINUE_INIT:
445 if (rqst->rq_proc != NULLPROC)
446 return (AUTH_FAILED); /* XXX ? */
448 if (_svcauth_gss_name == NULL) {
449 if (!svcauth_gss_import_name("nfs"))
450 return (AUTH_FAILED);
453 if (!svcauth_gss_acquire_cred())
454 return (AUTH_FAILED);
456 if (!svcauth_gss_accept_sec_context(rqst, &gr))
457 return (AUTH_REJECTEDCRED);
459 if (!svcauth_gss_nextverf(rqst, htonl(gr.gr_win)))
460 return (AUTH_FAILED);
464 call_stat = svc_sendreply(rqst->rq_xprt, xdr_rpc_gss_init_res,
468 return (AUTH_FAILED);
470 if (gr.gr_major == GSS_S_COMPLETE)
471 gd->established = TRUE;
475 case RPCSEC_GSS_DATA:
476 if (!svcauth_gss_validate(gd, msg))
477 return (RPCSEC_GSS_CREDPROBLEM);
479 if (!svcauth_gss_nextverf(rqst, htonl(gc->gc_seq)))
480 return (AUTH_FAILED);
483 case RPCSEC_GSS_DESTROY:
484 if (rqst->rq_proc != NULLPROC)
485 return (AUTH_FAILED); /* XXX ? */
487 if (!svcauth_gss_validate(gd, msg))
488 return (RPCSEC_GSS_CREDPROBLEM);
490 if (!svcauth_gss_nextverf(rqst, htonl(gc->gc_seq)))
491 return (AUTH_FAILED);
493 if (!svcauth_gss_release_cred())
494 return (AUTH_FAILED);
496 SVCAUTH_DESTROY(rqst->rq_xprt->xp_auth);
497 rqst->rq_xprt->xp_auth = &svc_auth_none;
502 return (AUTH_REJECTEDCRED);
509 svcauth_gss_destroy(SVCAUTH *auth)
511 struct svc_rpc_gss_data *gd;
514 log_debug("in svcauth_gss_destroy()");
516 gd = SVCAUTH_PRIVATE(auth);
518 gss_delete_sec_context(&min_stat, &gd->ctx, GSS_C_NO_BUFFER);
519 gss_release_buffer(&min_stat, &gd->cname);
522 gss_release_name(&min_stat, &gd->client_name);
524 mem_free(gd, sizeof(*gd));
525 mem_free(auth, sizeof(*auth));
531 svcauth_gss_wrap(SVCAUTH *auth, XDR *xdrs, xdrproc_t xdr_func, caddr_t xdr_ptr)
533 struct svc_rpc_gss_data *gd;
535 log_debug("in svcauth_gss_wrap()");
537 gd = SVCAUTH_PRIVATE(auth);
539 if (!gd->established || gd->sec.svc == RPCSEC_GSS_SVC_NONE) {
540 return ((*xdr_func)(xdrs, xdr_ptr));
542 return (xdr_rpc_gss_data(xdrs, xdr_func, xdr_ptr,
543 gd->ctx, gd->sec.qop,
544 gd->sec.svc, gd->seq));
548 svcauth_gss_unwrap(SVCAUTH *auth, XDR *xdrs, xdrproc_t xdr_func, caddr_t xdr_ptr)
550 struct svc_rpc_gss_data *gd;
552 log_debug("in svcauth_gss_unwrap()");
554 gd = SVCAUTH_PRIVATE(auth);
556 if (!gd->established || gd->sec.svc == RPCSEC_GSS_SVC_NONE) {
557 return ((*xdr_func)(xdrs, xdr_ptr));
559 return (xdr_rpc_gss_data(xdrs, xdr_func, xdr_ptr,
560 gd->ctx, gd->sec.qop,
561 gd->sec.svc, gd->seq));
565 svcauth_gss_get_principal(SVCAUTH *auth)
567 struct svc_rpc_gss_data *gd;
570 gd = SVCAUTH_PRIVATE(auth);
572 if (gd->cname.length == 0)
575 if ((pname = malloc(gd->cname.length + 1)) == NULL)
578 memcpy(pname, gd->cname.value, gd->cname.length);
579 pname[gd->cname.length] = '\0';