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Linux/net/sunrpc/auth_gss/gss_rpc_upcall.c

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  1 /*
  2  *  linux/net/sunrpc/gss_rpc_upcall.c
  3  *
  4  *  Copyright (C) 2012 Simo Sorce <simo@redhat.com>
  5  *
  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.
 10  *
 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.
 15  *
 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.
 19  */
 20 
 21 #include <linux/types.h>
 22 #include <linux/un.h>
 23 
 24 #include <linux/sunrpc/svcauth.h>
 25 #include "gss_rpc_upcall.h"
 26 
 27 #define GSSPROXY_SOCK_PATHNAME  "/var/run/gssproxy.sock"
 28 
 29 #define GSSPROXY_PROGRAM        (400112u)
 30 #define GSSPROXY_VERS_1         (1u)
 31 
 32 /*
 33  * Encoding/Decoding functions
 34  */
 35 
 36 enum {
 37         GSSX_NULL = 0,  /* Unused */
 38         GSSX_INDICATE_MECHS = 1,
 39         GSSX_GET_CALL_CONTEXT = 2,
 40         GSSX_IMPORT_AND_CANON_NAME = 3,
 41         GSSX_EXPORT_CRED = 4,
 42         GSSX_IMPORT_CRED = 5,
 43         GSSX_ACQUIRE_CRED = 6,
 44         GSSX_STORE_CRED = 7,
 45         GSSX_INIT_SEC_CONTEXT = 8,
 46         GSSX_ACCEPT_SEC_CONTEXT = 9,
 47         GSSX_RELEASE_HANDLE = 10,
 48         GSSX_GET_MIC = 11,
 49         GSSX_VERIFY = 12,
 50         GSSX_WRAP = 13,
 51         GSSX_UNWRAP = 14,
 52         GSSX_WRAP_SIZE_LIMIT = 15,
 53 };
 54 
 55 #define PROC(proc, name)                                \
 56 [GSSX_##proc] = {                                       \
 57         .p_proc   = GSSX_##proc,                        \
 58         .p_encode = gssx_enc_##name,    \
 59         .p_decode = gssx_dec_##name,    \
 60         .p_arglen = GSSX_ARG_##name##_sz,               \
 61         .p_replen = GSSX_RES_##name##_sz,               \
 62         .p_statidx = GSSX_##proc,                       \
 63         .p_name   = #proc,                              \
 64 }
 65 
 66 static const 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),
 78         PROC(VERIFY, verify),
 79         PROC(WRAP, wrap),
 80         PROC(UNWRAP, unwrap),
 81         PROC(WRAP_SIZE_LIMIT, wrap_size_limit),
 82 };
 83 
 84 
 85 
 86 /*
 87  * Common transport functions
 88  */
 89 
 90 static const struct rpc_program gssp_program;
 91 
 92 static int gssp_rpc_create(struct net *net, struct rpc_clnt **_clnt)
 93 {
 94         static const struct sockaddr_un gssp_localaddr = {
 95                 .sun_family             = AF_LOCAL,
 96                 .sun_path               = GSSPROXY_SOCK_PATHNAME,
 97         };
 98         struct rpc_create_args args = {
 99                 .net            = net,
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,
107                 /*
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:
112                  */
113                 .flags          = RPC_CLNT_CREATE_NOPING |
114                                   RPC_CLNT_CREATE_NO_IDLE_TIMEOUT
115         };
116         struct rpc_clnt *clnt;
117         int result = 0;
118 
119         clnt = rpc_create(&args);
120         if (IS_ERR(clnt)) {
121                 dprintk("RPC:       failed to create AF_LOCAL gssproxy "
122                                 "client (errno %ld).\n", PTR_ERR(clnt));
123                 result = PTR_ERR(clnt);
124                 *_clnt = NULL;
125                 goto out;
126         }
127 
128         dprintk("RPC:       created new gssp local client (gssp_local_clnt: "
129                         "%p)\n", clnt);
130         *_clnt = clnt;
131 
132 out:
133         return result;
134 }
135 
136 void init_gssp_clnt(struct sunrpc_net *sn)
137 {
138         mutex_init(&sn->gssp_lock);
139         sn->gssp_clnt = NULL;
140 }
141 
142 int set_gssp_clnt(struct net *net)
143 {
144         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
145         struct rpc_clnt *clnt;
146         int ret;
147 
148         mutex_lock(&sn->gssp_lock);
149         ret = gssp_rpc_create(net, &clnt);
150         if (!ret) {
151                 if (sn->gssp_clnt)
152                         rpc_shutdown_client(sn->gssp_clnt);
153                 sn->gssp_clnt = clnt;
154         }
155         mutex_unlock(&sn->gssp_lock);
156         return ret;
157 }
158 
159 void clear_gssp_clnt(struct sunrpc_net *sn)
160 {
161         mutex_lock(&sn->gssp_lock);
162         if (sn->gssp_clnt) {
163                 rpc_shutdown_client(sn->gssp_clnt);
164                 sn->gssp_clnt = NULL;
165         }
166         mutex_unlock(&sn->gssp_lock);
167 }
168 
169 static struct rpc_clnt *get_gssp_clnt(struct sunrpc_net *sn)
170 {
171         struct rpc_clnt *clnt;
172 
173         mutex_lock(&sn->gssp_lock);
174         clnt = sn->gssp_clnt;
175         if (clnt)
176                 atomic_inc(&clnt->cl_count);
177         mutex_unlock(&sn->gssp_lock);
178         return clnt;
179 }
180 
181 static int gssp_call(struct net *net, struct rpc_message *msg)
182 {
183         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
184         struct rpc_clnt *clnt;
185         int status;
186 
187         clnt = get_gssp_clnt(sn);
188         if (!clnt)
189                 return -EIO;
190         status = rpc_call_sync(clnt, msg, 0);
191         if (status < 0) {
192                 dprintk("gssp: rpc_call returned error %d\n", -status);
193                 switch (status) {
194                 case -EPROTONOSUPPORT:
195                         status = -EINVAL;
196                         break;
197                 case -ECONNREFUSED:
198                 case -ETIMEDOUT:
199                 case -ENOTCONN:
200                         status = -EAGAIN;
201                         break;
202                 case -ERESTARTSYS:
203                         if (signalled ())
204                                 status = -EINTR;
205                         break;
206                 default:
207                         break;
208                 }
209         }
210         rpc_release_client(clnt);
211         return status;
212 }
213 
214 static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg)
215 {
216         int i;
217 
218         for (i = 0; i < arg->npages && arg->pages[i]; i++)
219                 __free_page(arg->pages[i]);
220 
221         kfree(arg->pages);
222 }
223 
224 static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
225 {
226         arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE);
227         arg->pages = kzalloc(arg->npages * sizeof(struct page *), GFP_KERNEL);
228         /*
229          * XXX: actual pages are allocated by xdr layer in
230          * xdr_partial_copy_from_skb.
231          */
232         if (!arg->pages)
233                 return -ENOMEM;
234         return 0;
235 }
236 
237 /*
238  * Public functions
239  */
240 
241 /* numbers somewhat arbitrary but large enough for current needs */
242 #define GSSX_MAX_OUT_HANDLE     128
243 #define GSSX_MAX_SRC_PRINC      256
244 #define GSSX_KMEMBUF (GSSX_max_output_handle_sz + \
245                         GSSX_max_oid_sz + \
246                         GSSX_max_princ_sz + \
247                         sizeof(struct svc_cred))
248 
249 int gssp_accept_sec_context_upcall(struct net *net,
250                                 struct gssp_upcall_data *data)
251 {
252         struct gssx_ctx ctxh = {
253                 .state = data->in_handle
254         };
255         struct gssx_arg_accept_sec_context arg = {
256                 .input_token = data->in_token,
257         };
258         struct gssx_ctx rctxh = {
259                 /*
260                  * pass in the max length we expect for each of these
261                  * buffers but let the xdr code kmalloc them:
262                  */
263                 .exported_context_token.len = GSSX_max_output_handle_sz,
264                 .mech.len = GSS_OID_MAX_LEN,
265                 .src_name.display_name.len = GSSX_max_princ_sz
266         };
267         struct gssx_res_accept_sec_context res = {
268                 .context_handle = &rctxh,
269                 .output_token = &data->out_token
270         };
271         struct rpc_message msg = {
272                 .rpc_proc = &gssp_procedures[GSSX_ACCEPT_SEC_CONTEXT],
273                 .rpc_argp = &arg,
274                 .rpc_resp = &res,
275                 .rpc_cred = NULL, /* FIXME ? */
276         };
277         struct xdr_netobj client_name = { 0 , NULL };
278         int ret;
279 
280         if (data->in_handle.len != 0)
281                 arg.context_handle = &ctxh;
282         res.output_token->len = GSSX_max_output_token_sz;
283 
284         ret = gssp_alloc_receive_pages(&arg);
285         if (ret)
286                 return ret;
287 
288         /* use nfs/ for targ_name ? */
289 
290         ret = gssp_call(net, &msg);
291 
292         gssp_free_receive_pages(&arg);
293 
294         /* we need to fetch all data even in case of error so
295          * that we can free special strctures is they have been allocated */
296         data->major_status = res.status.major_status;
297         data->minor_status = res.status.minor_status;
298         if (res.context_handle) {
299                 data->out_handle = rctxh.exported_context_token;
300                 data->mech_oid.len = rctxh.mech.len;
301                 if (rctxh.mech.data)
302                         memcpy(data->mech_oid.data, rctxh.mech.data,
303                                                 data->mech_oid.len);
304                 client_name = rctxh.src_name.display_name;
305         }
306 
307         if (res.options.count == 1) {
308                 gssx_buffer *value = &res.options.data[0].value;
309                 /* Currently we only decode CREDS_VALUE, if we add
310                  * anything else we'll have to loop and match on the
311                  * option name */
312                 if (value->len == 1) {
313                         /* steal group info from struct svc_cred */
314                         data->creds = *(struct svc_cred *)value->data;
315                         data->found_creds = 1;
316                 }
317                 /* whether we use it or not, free data */
318                 kfree(value->data);
319         }
320 
321         if (res.options.count != 0) {
322                 kfree(res.options.data);
323         }
324 
325         /* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */
326         if (data->found_creds && client_name.data != NULL) {
327                 char *c;
328 
329                 data->creds.cr_raw_principal = kstrndup(client_name.data,
330                                                 client_name.len, GFP_KERNEL);
331 
332                 data->creds.cr_principal = kstrndup(client_name.data,
333                                                 client_name.len, GFP_KERNEL);
334                 if (data->creds.cr_principal) {
335                         /* terminate and remove realm part */
336                         c = strchr(data->creds.cr_principal, '@');
337                         if (c) {
338                                 *c = '\0';
339 
340                                 /* change service-hostname delimiter */
341                                 c = strchr(data->creds.cr_principal, '/');
342                                 if (c) *c = '@';
343                         }
344                         if (!c) {
345                                 /* not a service principal */
346                                 kfree(data->creds.cr_principal);
347                                 data->creds.cr_principal = NULL;
348                         }
349                 }
350         }
351         kfree(client_name.data);
352 
353         return ret;
354 }
355 
356 void gssp_free_upcall_data(struct gssp_upcall_data *data)
357 {
358         kfree(data->in_handle.data);
359         kfree(data->out_handle.data);
360         kfree(data->out_token.data);
361         free_svc_cred(&data->creds);
362 }
363 
364 /*
365  * Initialization stuff
366  */
367 static unsigned int gssp_version1_counts[ARRAY_SIZE(gssp_procedures)];
368 static const struct rpc_version gssp_version1 = {
369         .number         = GSSPROXY_VERS_1,
370         .nrprocs        = ARRAY_SIZE(gssp_procedures),
371         .procs          = gssp_procedures,
372         .counts         = gssp_version1_counts,
373 };
374 
375 static const struct rpc_version *gssp_version[] = {
376         NULL,
377         &gssp_version1,
378 };
379 
380 static struct rpc_stat gssp_stats;
381 
382 static const struct rpc_program gssp_program = {
383         .name           = "gssproxy",
384         .number         = GSSPROXY_PROGRAM,
385         .nrvers         = ARRAY_SIZE(gssp_version),
386         .version        = gssp_version,
387         .stats          = &gssp_stats,
388 };
389 

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