2 * linux/net/sunrpc/gss_rpc_upcall.c
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/types.h>
24 #include <linux/sunrpc/svcauth.h>
25 #include "gss_rpc_upcall.h"
27 #define GSSPROXY_SOCK_PATHNAME "/var/run/gssproxy.sock"
29 #define GSSPROXY_PROGRAM (400112u)
30 #define GSSPROXY_VERS_1 (1u)
33 * Encoding/Decoding functions
37 GSSX_NULL = 0, /* Unused */
38 GSSX_INDICATE_MECHS = 1,
39 GSSX_GET_CALL_CONTEXT = 2,
40 GSSX_IMPORT_AND_CANON_NAME = 3,
43 GSSX_ACQUIRE_CRED = 6,
45 GSSX_INIT_SEC_CONTEXT = 8,
46 GSSX_ACCEPT_SEC_CONTEXT = 9,
47 GSSX_RELEASE_HANDLE = 10,
52 GSSX_WRAP_SIZE_LIMIT = 15,
55 #define PROC(proc, name) \
57 .p_proc = GSSX_##proc, \
58 .p_encode = (kxdreproc_t)gssx_enc_##name, \
59 .p_decode = (kxdrdproc_t)gssx_dec_##name, \
60 .p_arglen = GSSX_ARG_##name##_sz, \
61 .p_replen = GSSX_RES_##name##_sz, \
62 .p_statidx = GSSX_##proc, \
66 static struct rpc_procinfo gssp_procedures[] = {
67 PROC(INDICATE_MECHS, indicate_mechs),
68 PROC(GET_CALL_CONTEXT, get_call_context),
69 PROC(IMPORT_AND_CANON_NAME, import_and_canon_name),
70 PROC(EXPORT_CRED, export_cred),
71 PROC(IMPORT_CRED, import_cred),
72 PROC(ACQUIRE_CRED, acquire_cred),
73 PROC(STORE_CRED, store_cred),
74 PROC(INIT_SEC_CONTEXT, init_sec_context),
75 PROC(ACCEPT_SEC_CONTEXT, accept_sec_context),
76 PROC(RELEASE_HANDLE, release_handle),
77 PROC(GET_MIC, get_mic),
81 PROC(WRAP_SIZE_LIMIT, wrap_size_limit),
87 * Common transport functions
90 static const struct rpc_program gssp_program;
92 static int gssp_rpc_create(struct net *net, struct rpc_clnt **_clnt)
94 static const struct sockaddr_un gssp_localaddr = {
95 .sun_family = AF_LOCAL,
96 .sun_path = GSSPROXY_SOCK_PATHNAME,
98 struct rpc_create_args args = {
100 .protocol = XPRT_TRANSPORT_LOCAL,
101 .address = (struct sockaddr *)&gssp_localaddr,
102 .addrsize = sizeof(gssp_localaddr),
103 .servername = "localhost",
104 .program = &gssp_program,
105 .version = GSSPROXY_VERS_1,
106 .authflavor = RPC_AUTH_NULL,
108 * Note we want connection to be done in the caller's
109 * filesystem namespace. We therefore turn off the idle
110 * timeout, which would result in reconnections being
111 * done without the correct namespace:
113 .flags = RPC_CLNT_CREATE_NOPING |
114 RPC_CLNT_CREATE_NO_IDLE_TIMEOUT
116 struct rpc_clnt *clnt;
119 clnt = rpc_create(&args);
121 dprintk("RPC: failed to create AF_LOCAL gssproxy "
122 "client (errno %ld).\n", PTR_ERR(clnt));
123 result = -PTR_ERR(clnt);
128 dprintk("RPC: created new gssp local client (gssp_local_clnt: "
136 void init_gssp_clnt(struct sunrpc_net *sn)
138 mutex_init(&sn->gssp_lock);
139 sn->gssp_clnt = NULL;
140 init_waitqueue_head(&sn->gssp_wq);
143 int set_gssp_clnt(struct net *net)
145 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
146 struct rpc_clnt *clnt;
149 mutex_lock(&sn->gssp_lock);
150 ret = gssp_rpc_create(net, &clnt);
153 rpc_shutdown_client(sn->gssp_clnt);
154 sn->gssp_clnt = clnt;
156 mutex_unlock(&sn->gssp_lock);
157 wake_up(&sn->gssp_wq);
161 void clear_gssp_clnt(struct sunrpc_net *sn)
163 mutex_lock(&sn->gssp_lock);
165 rpc_shutdown_client(sn->gssp_clnt);
166 sn->gssp_clnt = NULL;
168 mutex_unlock(&sn->gssp_lock);
171 static struct rpc_clnt *get_gssp_clnt(struct sunrpc_net *sn)
173 struct rpc_clnt *clnt;
175 mutex_lock(&sn->gssp_lock);
176 clnt = sn->gssp_clnt;
178 atomic_inc(&clnt->cl_count);
179 mutex_unlock(&sn->gssp_lock);
183 static int gssp_call(struct net *net, struct rpc_message *msg)
185 struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
186 struct rpc_clnt *clnt;
189 clnt = get_gssp_clnt(sn);
192 status = rpc_call_sync(clnt, msg, 0);
194 dprintk("gssp: rpc_call returned error %d\n", -status);
196 case -EPROTONOSUPPORT:
212 rpc_release_client(clnt);
221 /* numbers somewhat arbitrary but large enough for current needs */
222 #define GSSX_MAX_OUT_HANDLE 128
223 #define GSSX_MAX_SRC_PRINC 256
224 #define GSSX_KMEMBUF (GSSX_max_output_handle_sz + \
226 GSSX_max_princ_sz + \
227 sizeof(struct svc_cred))
229 int gssp_accept_sec_context_upcall(struct net *net,
230 struct gssp_upcall_data *data)
232 struct gssx_ctx ctxh = {
233 .state = data->in_handle
235 struct gssx_arg_accept_sec_context arg = {
236 .input_token = data->in_token,
238 struct gssx_ctx rctxh = {
240 * pass in the max length we expect for each of these
241 * buffers but let the xdr code kmalloc them:
243 .exported_context_token.len = GSSX_max_output_handle_sz,
244 .mech.len = GSS_OID_MAX_LEN,
245 .src_name.display_name.len = GSSX_max_princ_sz
247 struct gssx_res_accept_sec_context res = {
248 .context_handle = &rctxh,
249 .output_token = &data->out_token
251 struct rpc_message msg = {
252 .rpc_proc = &gssp_procedures[GSSX_ACCEPT_SEC_CONTEXT],
255 .rpc_cred = NULL, /* FIXME ? */
257 struct xdr_netobj client_name = { 0 , NULL };
260 if (data->in_handle.len != 0)
261 arg.context_handle = &ctxh;
262 res.output_token->len = GSSX_max_output_token_sz;
264 /* use nfs/ for targ_name ? */
266 ret = gssp_call(net, &msg);
268 /* we need to fetch all data even in case of error so
269 * that we can free special strctures is they have been allocated */
270 data->major_status = res.status.major_status;
271 data->minor_status = res.status.minor_status;
272 if (res.context_handle) {
273 data->out_handle = rctxh.exported_context_token;
274 data->mech_oid.len = rctxh.mech.len;
275 memcpy(data->mech_oid.data, rctxh.mech.data,
277 client_name = rctxh.src_name.display_name;
280 if (res.options.count == 1) {
281 gssx_buffer *value = &res.options.data[0].value;
282 /* Currently we only decode CREDS_VALUE, if we add
283 * anything else we'll have to loop and match on the
285 if (value->len == 1) {
286 /* steal group info from struct svc_cred */
287 data->creds = *(struct svc_cred *)value->data;
288 data->found_creds = 1;
290 /* whether we use it or not, free data */
294 if (res.options.count != 0) {
295 kfree(res.options.data);
298 /* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */
299 if (data->found_creds && client_name.data != NULL) {
302 data->creds.cr_principal = kstrndup(client_name.data,
303 client_name.len, GFP_KERNEL);
304 if (data->creds.cr_principal) {
305 /* terminate and remove realm part */
306 c = strchr(data->creds.cr_principal, '@');
310 /* change service-hostname delimiter */
311 c = strchr(data->creds.cr_principal, '/');
315 /* not a service principal */
316 kfree(data->creds.cr_principal);
317 data->creds.cr_principal = NULL;
321 kfree(client_name.data);
326 void gssp_free_upcall_data(struct gssp_upcall_data *data)
328 kfree(data->in_handle.data);
329 kfree(data->out_handle.data);
330 kfree(data->out_token.data);
331 kfree(data->mech_oid.data);
332 free_svc_cred(&data->creds);
336 * Initialization stuff
339 static const struct rpc_version gssp_version1 = {
340 .number = GSSPROXY_VERS_1,
341 .nrprocs = ARRAY_SIZE(gssp_procedures),
342 .procs = gssp_procedures,
345 static const struct rpc_version *gssp_version[] = {
350 static struct rpc_stat gssp_stats;
352 static const struct rpc_program gssp_program = {
354 .number = GSSPROXY_PROGRAM,
355 .nrvers = ARRAY_SIZE(gssp_version),
356 .version = gssp_version,
357 .stats = &gssp_stats,