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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
34
35
36enum {
37 GSSX_NULL = 0,
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
66static 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
88
89
90static const struct rpc_program gssp_program;
91
92static 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
109
110
111
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
132out:
133 return result;
134}
135
136void init_gssp_clnt(struct sunrpc_net *sn)
137{
138 mutex_init(&sn->gssp_lock);
139 sn->gssp_clnt = NULL;
140}
141
142int 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
159void 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
169static 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
181static 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
214static 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
224static 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 = kcalloc(arg->npages, sizeof(struct page *), GFP_KERNEL);
228
229
230
231
232 if (!arg->pages)
233 return -ENOMEM;
234 return 0;
235}
236
237
238
239
240
241
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
249int 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
261
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,
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
289
290 ret = gssp_call(net, &msg);
291
292 gssp_free_receive_pages(&arg);
293
294
295
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 kfree(rctxh.mech.data);
305 }
306 client_name = rctxh.src_name.display_name;
307 }
308
309 if (res.options.count == 1) {
310 gssx_buffer *value = &res.options.data[0].value;
311
312
313
314 if (value->len == 1) {
315
316 data->creds = *(struct svc_cred *)value->data;
317 data->found_creds = 1;
318 }
319
320 kfree(value->data);
321 }
322
323 if (res.options.count != 0) {
324 kfree(res.options.data);
325 }
326
327
328 if (data->found_creds && client_name.data != NULL) {
329 char *c;
330
331 data->creds.cr_raw_principal = kstrndup(client_name.data,
332 client_name.len, GFP_KERNEL);
333
334 data->creds.cr_principal = kstrndup(client_name.data,
335 client_name.len, GFP_KERNEL);
336 if (data->creds.cr_principal) {
337
338 c = strchr(data->creds.cr_principal, '@');
339 if (c) {
340 *c = '\0';
341
342
343 c = strchr(data->creds.cr_principal, '/');
344 if (c) *c = '@';
345 }
346 if (!c) {
347
348 kfree(data->creds.cr_principal);
349 data->creds.cr_principal = NULL;
350 }
351 }
352 }
353 kfree(client_name.data);
354
355 return ret;
356}
357
358void gssp_free_upcall_data(struct gssp_upcall_data *data)
359{
360 kfree(data->in_handle.data);
361 kfree(data->out_handle.data);
362 kfree(data->out_token.data);
363 free_svc_cred(&data->creds);
364}
365
366
367
368
369static unsigned int gssp_version1_counts[ARRAY_SIZE(gssp_procedures)];
370static const struct rpc_version gssp_version1 = {
371 .number = GSSPROXY_VERS_1,
372 .nrprocs = ARRAY_SIZE(gssp_procedures),
373 .procs = gssp_procedures,
374 .counts = gssp_version1_counts,
375};
376
377static const struct rpc_version *gssp_version[] = {
378 NULL,
379 &gssp_version1,
380};
381
382static struct rpc_stat gssp_stats;
383
384static const struct rpc_program gssp_program = {
385 .name = "gssproxy",
386 .number = GSSPROXY_PROGRAM,
387 .nrvers = ARRAY_SIZE(gssp_version),
388 .version = gssp_version,
389 .stats = &gssp_stats,
390};
391
