2 * GSS Proxy upcall module
4 * Copyright (C) 2012 Simo Sorce <simo@redhat.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 #include <linux/sunrpc/svcauth.h>
22 #include "gss_rpc_xdr.h"
24 static int gssx_enc_bool(struct xdr_stream *xdr, int v)
28 p = xdr_reserve_space(xdr, 4);
29 if (unlikely(p == NULL))
31 *p = v ? xdr_one : xdr_zero;
35 static int gssx_dec_bool(struct xdr_stream *xdr, u32 *v)
39 p = xdr_inline_decode(xdr, 4);
40 if (unlikely(p == NULL))
46 static int gssx_enc_buffer(struct xdr_stream *xdr,
51 p = xdr_reserve_space(xdr, sizeof(u32) + buf->len);
54 xdr_encode_opaque(p, buf->data, buf->len);
58 static int gssx_enc_in_token(struct xdr_stream *xdr,
59 struct gssp_in_token *in)
63 p = xdr_reserve_space(xdr, 4);
66 *p = cpu_to_be32(in->page_len);
68 /* all we need to do is to write pages */
69 xdr_write_pages(xdr, in->pages, in->page_base, in->page_len);
75 static int gssx_dec_buffer(struct xdr_stream *xdr,
81 p = xdr_inline_decode(xdr, 4);
82 if (unlikely(p == NULL))
85 length = be32_to_cpup(p);
86 p = xdr_inline_decode(xdr, length);
87 if (unlikely(p == NULL))
91 /* we intentionally are not interested in this buffer */
94 if (length > buf->len)
98 buf->data = kmemdup(p, length, GFP_KERNEL);
102 memcpy(buf->data, p, length);
108 static int gssx_enc_option(struct xdr_stream *xdr,
109 struct gssx_option *opt)
113 err = gssx_enc_buffer(xdr, &opt->option);
116 err = gssx_enc_buffer(xdr, &opt->value);
120 static int gssx_dec_option(struct xdr_stream *xdr,
121 struct gssx_option *opt)
125 err = gssx_dec_buffer(xdr, &opt->option);
128 err = gssx_dec_buffer(xdr, &opt->value);
132 static int dummy_enc_opt_array(struct xdr_stream *xdr,
133 struct gssx_option_array *oa)
140 p = xdr_reserve_space(xdr, 4);
148 static int dummy_dec_opt_array(struct xdr_stream *xdr,
149 struct gssx_option_array *oa)
151 struct gssx_option dummy;
155 p = xdr_inline_decode(xdr, 4);
156 if (unlikely(p == NULL))
158 count = be32_to_cpup(p++);
159 memset(&dummy, 0, sizeof(dummy));
160 for (i = 0; i < count; i++) {
161 gssx_dec_option(xdr, &dummy);
169 static int get_host_u32(struct xdr_stream *xdr, u32 *res)
173 p = xdr_inline_decode(xdr, 4);
176 /* Contents of linux creds are all host-endian: */
177 memcpy(res, p, sizeof(u32));
181 static int gssx_dec_linux_creds(struct xdr_stream *xdr,
182 struct svc_cred *creds)
190 p = xdr_inline_decode(xdr, 4);
191 if (unlikely(p == NULL))
194 length = be32_to_cpup(p);
196 if (length > (3 + NGROUPS_MAX) * sizeof(u32))
200 err = get_host_u32(xdr, &tmp);
203 creds->cr_uid = make_kuid(&init_user_ns, tmp);
206 err = get_host_u32(xdr, &tmp);
209 creds->cr_gid = make_kgid(&init_user_ns, tmp);
211 /* number of additional gid's */
212 err = get_host_u32(xdr, &tmp);
216 if ((3 + N) * sizeof(u32) != length)
218 creds->cr_group_info = groups_alloc(N);
219 if (creds->cr_group_info == NULL)
223 for (i = 0; i < N; i++) {
225 err = get_host_u32(xdr, &tmp);
227 goto out_free_groups;
229 kgid = make_kgid(&init_user_ns, tmp);
230 if (!gid_valid(kgid))
231 goto out_free_groups;
232 GROUP_AT(creds->cr_group_info, i) = kgid;
237 groups_free(creds->cr_group_info);
241 static int gssx_dec_option_array(struct xdr_stream *xdr,
242 struct gssx_option_array *oa)
244 struct svc_cred *creds;
249 p = xdr_inline_decode(xdr, 4);
250 if (unlikely(p == NULL))
252 count = be32_to_cpup(p++);
256 /* we recognize only 1 currently: CREDS_VALUE */
259 oa->data = kmalloc(sizeof(struct gssx_option), GFP_KERNEL);
263 creds = kmalloc(sizeof(struct svc_cred), GFP_KERNEL);
269 oa->data[0].option.data = CREDS_VALUE;
270 oa->data[0].option.len = sizeof(CREDS_VALUE);
271 oa->data[0].value.data = (void *)creds;
272 oa->data[0].value.len = 0;
274 for (i = 0; i < count; i++) {
275 gssx_buffer dummy = { 0, NULL };
279 p = xdr_inline_decode(xdr, 4);
280 if (unlikely(p == NULL))
283 length = be32_to_cpup(p);
284 p = xdr_inline_decode(xdr, length);
285 if (unlikely(p == NULL))
288 if (length == sizeof(CREDS_VALUE) &&
289 memcmp(p, CREDS_VALUE, sizeof(CREDS_VALUE)) == 0) {
290 /* We have creds here. parse them */
291 err = gssx_dec_linux_creds(xdr, creds);
294 oa->data[0].value.len = 1; /* presence */
296 /* consume uninteresting buffer */
297 err = gssx_dec_buffer(xdr, &dummy);
305 static int gssx_dec_status(struct xdr_stream *xdr,
306 struct gssx_status *status)
311 /* status->major_status */
312 p = xdr_inline_decode(xdr, 8);
313 if (unlikely(p == NULL))
315 p = xdr_decode_hyper(p, &status->major_status);
318 err = gssx_dec_buffer(xdr, &status->mech);
322 /* status->minor_status */
323 p = xdr_inline_decode(xdr, 8);
324 if (unlikely(p == NULL))
326 p = xdr_decode_hyper(p, &status->minor_status);
328 /* status->major_status_string */
329 err = gssx_dec_buffer(xdr, &status->major_status_string);
333 /* status->minor_status_string */
334 err = gssx_dec_buffer(xdr, &status->minor_status_string);
338 /* status->server_ctx */
339 err = gssx_dec_buffer(xdr, &status->server_ctx);
343 /* we assume we have no options for now, so simply consume them */
344 /* status->options */
345 err = dummy_dec_opt_array(xdr, &status->options);
350 static int gssx_enc_call_ctx(struct xdr_stream *xdr,
351 struct gssx_call_ctx *ctx)
353 struct gssx_option opt;
358 err = gssx_enc_buffer(xdr, &ctx->locale);
362 /* ctx->server_ctx */
363 err = gssx_enc_buffer(xdr, &ctx->server_ctx);
367 /* we always want to ask for lucid contexts */
369 p = xdr_reserve_space(xdr, 4);
372 /* we want a lucid_v1 context */
373 opt.option.data = LUCID_OPTION;
374 opt.option.len = sizeof(LUCID_OPTION);
375 opt.value.data = LUCID_VALUE;
376 opt.value.len = sizeof(LUCID_VALUE);
377 err = gssx_enc_option(xdr, &opt);
379 /* ..and user creds */
380 opt.option.data = CREDS_OPTION;
381 opt.option.len = sizeof(CREDS_OPTION);
382 opt.value.data = CREDS_VALUE;
383 opt.value.len = sizeof(CREDS_VALUE);
384 err = gssx_enc_option(xdr, &opt);
389 static int gssx_dec_name_attr(struct xdr_stream *xdr,
390 struct gssx_name_attr *attr)
395 err = gssx_dec_buffer(xdr, &attr->attr);
400 err = gssx_dec_buffer(xdr, &attr->value);
404 /* attr->extensions */
405 err = dummy_dec_opt_array(xdr, &attr->extensions);
410 static int dummy_enc_nameattr_array(struct xdr_stream *xdr,
411 struct gssx_name_attr_array *naa)
418 p = xdr_reserve_space(xdr, 4);
426 static int dummy_dec_nameattr_array(struct xdr_stream *xdr,
427 struct gssx_name_attr_array *naa)
429 struct gssx_name_attr dummy = { .attr = {.len = 0} };
433 p = xdr_inline_decode(xdr, 4);
434 if (unlikely(p == NULL))
436 count = be32_to_cpup(p++);
437 for (i = 0; i < count; i++) {
438 gssx_dec_name_attr(xdr, &dummy);
446 static struct xdr_netobj zero_netobj = {};
448 static struct gssx_name_attr_array zero_name_attr_array = {};
450 static struct gssx_option_array zero_option_array = {};
452 static int gssx_enc_name(struct xdr_stream *xdr,
453 struct gssx_name *name)
457 /* name->display_name */
458 err = gssx_enc_buffer(xdr, &name->display_name);
462 /* name->name_type */
463 err = gssx_enc_buffer(xdr, &zero_netobj);
467 /* name->exported_name */
468 err = gssx_enc_buffer(xdr, &zero_netobj);
472 /* name->exported_composite_name */
473 err = gssx_enc_buffer(xdr, &zero_netobj);
477 /* leave name_attributes empty for now, will add once we have any
478 * to pass up at all */
479 /* name->name_attributes */
480 err = dummy_enc_nameattr_array(xdr, &zero_name_attr_array);
484 /* leave options empty for now, will add once we have any options
485 * to pass up at all */
486 /* name->extensions */
487 err = dummy_enc_opt_array(xdr, &zero_option_array);
493 static int gssx_dec_name(struct xdr_stream *xdr,
494 struct gssx_name *name)
496 struct xdr_netobj dummy_netobj = { .len = 0 };
497 struct gssx_name_attr_array dummy_name_attr_array = { .count = 0 };
498 struct gssx_option_array dummy_option_array = { .count = 0 };
501 /* name->display_name */
502 err = gssx_dec_buffer(xdr, &name->display_name);
506 /* name->name_type */
507 err = gssx_dec_buffer(xdr, &dummy_netobj);
511 /* name->exported_name */
512 err = gssx_dec_buffer(xdr, &dummy_netobj);
516 /* name->exported_composite_name */
517 err = gssx_dec_buffer(xdr, &dummy_netobj);
521 /* we assume we have no attributes for now, so simply consume them */
522 /* name->name_attributes */
523 err = dummy_dec_nameattr_array(xdr, &dummy_name_attr_array);
527 /* we assume we have no options for now, so simply consume them */
528 /* name->extensions */
529 err = dummy_dec_opt_array(xdr, &dummy_option_array);
534 static int dummy_enc_credel_array(struct xdr_stream *xdr,
535 struct gssx_cred_element_array *cea)
542 p = xdr_reserve_space(xdr, 4);
550 static int gssx_enc_cred(struct xdr_stream *xdr,
551 struct gssx_cred *cred)
555 /* cred->desired_name */
556 err = gssx_enc_name(xdr, &cred->desired_name);
561 err = dummy_enc_credel_array(xdr, &cred->elements);
563 /* cred->cred_handle_reference */
564 err = gssx_enc_buffer(xdr, &cred->cred_handle_reference);
568 /* cred->needs_release */
569 err = gssx_enc_bool(xdr, cred->needs_release);
574 static int gssx_enc_ctx(struct xdr_stream *xdr,
575 struct gssx_ctx *ctx)
580 /* ctx->exported_context_token */
581 err = gssx_enc_buffer(xdr, &ctx->exported_context_token);
586 err = gssx_enc_buffer(xdr, &ctx->state);
590 /* ctx->need_release */
591 err = gssx_enc_bool(xdr, ctx->need_release);
596 err = gssx_enc_buffer(xdr, &ctx->mech);
601 err = gssx_enc_name(xdr, &ctx->src_name);
606 err = gssx_enc_name(xdr, &ctx->targ_name);
611 p = xdr_reserve_space(xdr, 8+8);
614 p = xdr_encode_hyper(p, ctx->lifetime);
617 p = xdr_encode_hyper(p, ctx->ctx_flags);
619 /* ctx->locally_initiated */
620 err = gssx_enc_bool(xdr, ctx->locally_initiated);
625 err = gssx_enc_bool(xdr, ctx->open);
629 /* leave options empty for now, will add once we have any options
630 * to pass up at all */
632 err = dummy_enc_opt_array(xdr, &ctx->options);
637 static int gssx_dec_ctx(struct xdr_stream *xdr,
638 struct gssx_ctx *ctx)
643 /* ctx->exported_context_token */
644 err = gssx_dec_buffer(xdr, &ctx->exported_context_token);
649 err = gssx_dec_buffer(xdr, &ctx->state);
653 /* ctx->need_release */
654 err = gssx_dec_bool(xdr, &ctx->need_release);
659 err = gssx_dec_buffer(xdr, &ctx->mech);
664 err = gssx_dec_name(xdr, &ctx->src_name);
669 err = gssx_dec_name(xdr, &ctx->targ_name);
674 p = xdr_inline_decode(xdr, 8+8);
675 if (unlikely(p == NULL))
677 p = xdr_decode_hyper(p, &ctx->lifetime);
680 p = xdr_decode_hyper(p, &ctx->ctx_flags);
682 /* ctx->locally_initiated */
683 err = gssx_dec_bool(xdr, &ctx->locally_initiated);
688 err = gssx_dec_bool(xdr, &ctx->open);
692 /* we assume we have no options for now, so simply consume them */
694 err = dummy_dec_opt_array(xdr, &ctx->options);
699 static int gssx_enc_cb(struct xdr_stream *xdr, struct gssx_cb *cb)
704 /* cb->initiator_addrtype */
705 p = xdr_reserve_space(xdr, 8);
708 p = xdr_encode_hyper(p, cb->initiator_addrtype);
710 /* cb->initiator_address */
711 err = gssx_enc_buffer(xdr, &cb->initiator_address);
715 /* cb->acceptor_addrtype */
716 p = xdr_reserve_space(xdr, 8);
719 p = xdr_encode_hyper(p, cb->acceptor_addrtype);
721 /* cb->acceptor_address */
722 err = gssx_enc_buffer(xdr, &cb->acceptor_address);
726 /* cb->application_data */
727 err = gssx_enc_buffer(xdr, &cb->application_data);
732 void gssx_enc_accept_sec_context(struct rpc_rqst *req,
733 struct xdr_stream *xdr,
734 struct gssx_arg_accept_sec_context *arg)
738 err = gssx_enc_call_ctx(xdr, &arg->call_ctx);
742 /* arg->context_handle */
743 if (arg->context_handle) {
744 err = gssx_enc_ctx(xdr, arg->context_handle);
748 err = gssx_enc_bool(xdr, 0);
751 /* arg->cred_handle */
752 if (arg->cred_handle) {
753 err = gssx_enc_cred(xdr, arg->cred_handle);
757 err = gssx_enc_bool(xdr, 0);
760 /* arg->input_token */
761 err = gssx_enc_in_token(xdr, &arg->input_token);
767 err = gssx_enc_cb(xdr, arg->input_cb);
771 err = gssx_enc_bool(xdr, 0);
774 err = gssx_enc_bool(xdr, arg->ret_deleg_cred);
778 /* leave options empty for now, will add once we have any options
779 * to pass up at all */
781 err = dummy_enc_opt_array(xdr, &arg->options);
783 xdr_inline_pages(&req->rq_rcv_buf,
784 PAGE_SIZE/2 /* pretty arbitrary */,
785 arg->pages, 0 /* page base */, arg->npages * PAGE_SIZE);
788 dprintk("RPC: gssx_enc_accept_sec_context: %d\n", err);
791 int gssx_dec_accept_sec_context(struct rpc_rqst *rqstp,
792 struct xdr_stream *xdr,
793 struct gssx_res_accept_sec_context *res)
799 err = gssx_dec_status(xdr, &res->status);
803 /* res->context_handle */
804 err = gssx_dec_bool(xdr, &value_follows);
808 err = gssx_dec_ctx(xdr, res->context_handle);
812 res->context_handle = NULL;
815 /* res->output_token */
816 err = gssx_dec_bool(xdr, &value_follows);
820 err = gssx_dec_buffer(xdr, res->output_token);
824 res->output_token = NULL;
827 /* res->delegated_cred_handle */
828 err = gssx_dec_bool(xdr, &value_follows);
832 /* we do not support upcall servers sending this data. */
837 err = gssx_dec_option_array(xdr, &res->options);