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Linux/net/sunrpc/auth_gss/gss_rpc_upcall.c

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  1 // SPDX-License-Identifier: GPL-2.0+
  2 /*
  3  *  linux/net/sunrpc/gss_rpc_upcall.c
  4  *
  5  *  Copyright (C) 2012 Simo Sorce <simo@redhat.com>
  6  */
  7 
  8 #include <linux/types.h>
  9 #include <linux/un.h>
 10 
 11 #include <linux/sunrpc/svcauth.h>
 12 #include "gss_rpc_upcall.h"
 13 
 14 #define GSSPROXY_SOCK_PATHNAME  "/var/run/gssproxy.sock"
 15 
 16 #define GSSPROXY_PROGRAM        (400112u)
 17 #define GSSPROXY_VERS_1         (1u)
 18 
 19 /*
 20  * Encoding/Decoding functions
 21  */
 22 
 23 enum {
 24         GSSX_NULL = 0,  /* Unused */
 25         GSSX_INDICATE_MECHS = 1,
 26         GSSX_GET_CALL_CONTEXT = 2,
 27         GSSX_IMPORT_AND_CANON_NAME = 3,
 28         GSSX_EXPORT_CRED = 4,
 29         GSSX_IMPORT_CRED = 5,
 30         GSSX_ACQUIRE_CRED = 6,
 31         GSSX_STORE_CRED = 7,
 32         GSSX_INIT_SEC_CONTEXT = 8,
 33         GSSX_ACCEPT_SEC_CONTEXT = 9,
 34         GSSX_RELEASE_HANDLE = 10,
 35         GSSX_GET_MIC = 11,
 36         GSSX_VERIFY = 12,
 37         GSSX_WRAP = 13,
 38         GSSX_UNWRAP = 14,
 39         GSSX_WRAP_SIZE_LIMIT = 15,
 40 };
 41 
 42 #define PROC(proc, name)                                \
 43 [GSSX_##proc] = {                                       \
 44         .p_proc   = GSSX_##proc,                        \
 45         .p_encode = gssx_enc_##name,    \
 46         .p_decode = gssx_dec_##name,    \
 47         .p_arglen = GSSX_ARG_##name##_sz,               \
 48         .p_replen = GSSX_RES_##name##_sz,               \
 49         .p_statidx = GSSX_##proc,                       \
 50         .p_name   = #proc,                              \
 51 }
 52 
 53 static const struct rpc_procinfo gssp_procedures[] = {
 54         PROC(INDICATE_MECHS, indicate_mechs),
 55         PROC(GET_CALL_CONTEXT, get_call_context),
 56         PROC(IMPORT_AND_CANON_NAME, import_and_canon_name),
 57         PROC(EXPORT_CRED, export_cred),
 58         PROC(IMPORT_CRED, import_cred),
 59         PROC(ACQUIRE_CRED, acquire_cred),
 60         PROC(STORE_CRED, store_cred),
 61         PROC(INIT_SEC_CONTEXT, init_sec_context),
 62         PROC(ACCEPT_SEC_CONTEXT, accept_sec_context),
 63         PROC(RELEASE_HANDLE, release_handle),
 64         PROC(GET_MIC, get_mic),
 65         PROC(VERIFY, verify),
 66         PROC(WRAP, wrap),
 67         PROC(UNWRAP, unwrap),
 68         PROC(WRAP_SIZE_LIMIT, wrap_size_limit),
 69 };
 70 
 71 
 72 
 73 /*
 74  * Common transport functions
 75  */
 76 
 77 static const struct rpc_program gssp_program;
 78 
 79 static int gssp_rpc_create(struct net *net, struct rpc_clnt **_clnt)
 80 {
 81         static const struct sockaddr_un gssp_localaddr = {
 82                 .sun_family             = AF_LOCAL,
 83                 .sun_path               = GSSPROXY_SOCK_PATHNAME,
 84         };
 85         struct rpc_create_args args = {
 86                 .net            = net,
 87                 .protocol       = XPRT_TRANSPORT_LOCAL,
 88                 .address        = (struct sockaddr *)&gssp_localaddr,
 89                 .addrsize       = sizeof(gssp_localaddr),
 90                 .servername     = "localhost",
 91                 .program        = &gssp_program,
 92                 .version        = GSSPROXY_VERS_1,
 93                 .authflavor     = RPC_AUTH_NULL,
 94                 /*
 95                  * Note we want connection to be done in the caller's
 96                  * filesystem namespace.  We therefore turn off the idle
 97                  * timeout, which would result in reconnections being
 98                  * done without the correct namespace:
 99                  */
100                 .flags          = RPC_CLNT_CREATE_NOPING |
101                                   RPC_CLNT_CREATE_NO_IDLE_TIMEOUT
102         };
103         struct rpc_clnt *clnt;
104         int result = 0;
105 
106         clnt = rpc_create(&args);
107         if (IS_ERR(clnt)) {
108                 dprintk("RPC:       failed to create AF_LOCAL gssproxy "
109                                 "client (errno %ld).\n", PTR_ERR(clnt));
110                 result = PTR_ERR(clnt);
111                 *_clnt = NULL;
112                 goto out;
113         }
114 
115         dprintk("RPC:       created new gssp local client (gssp_local_clnt: "
116                         "%p)\n", clnt);
117         *_clnt = clnt;
118 
119 out:
120         return result;
121 }
122 
123 void init_gssp_clnt(struct sunrpc_net *sn)
124 {
125         mutex_init(&sn->gssp_lock);
126         sn->gssp_clnt = NULL;
127 }
128 
129 int set_gssp_clnt(struct net *net)
130 {
131         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
132         struct rpc_clnt *clnt;
133         int ret;
134 
135         mutex_lock(&sn->gssp_lock);
136         ret = gssp_rpc_create(net, &clnt);
137         if (!ret) {
138                 if (sn->gssp_clnt)
139                         rpc_shutdown_client(sn->gssp_clnt);
140                 sn->gssp_clnt = clnt;
141         }
142         mutex_unlock(&sn->gssp_lock);
143         return ret;
144 }
145 
146 void clear_gssp_clnt(struct sunrpc_net *sn)
147 {
148         mutex_lock(&sn->gssp_lock);
149         if (sn->gssp_clnt) {
150                 rpc_shutdown_client(sn->gssp_clnt);
151                 sn->gssp_clnt = NULL;
152         }
153         mutex_unlock(&sn->gssp_lock);
154 }
155 
156 static struct rpc_clnt *get_gssp_clnt(struct sunrpc_net *sn)
157 {
158         struct rpc_clnt *clnt;
159 
160         mutex_lock(&sn->gssp_lock);
161         clnt = sn->gssp_clnt;
162         if (clnt)
163                 atomic_inc(&clnt->cl_count);
164         mutex_unlock(&sn->gssp_lock);
165         return clnt;
166 }
167 
168 static int gssp_call(struct net *net, struct rpc_message *msg)
169 {
170         struct sunrpc_net *sn = net_generic(net, sunrpc_net_id);
171         struct rpc_clnt *clnt;
172         int status;
173 
174         clnt = get_gssp_clnt(sn);
175         if (!clnt)
176                 return -EIO;
177         status = rpc_call_sync(clnt, msg, 0);
178         if (status < 0) {
179                 dprintk("gssp: rpc_call returned error %d\n", -status);
180                 switch (status) {
181                 case -EPROTONOSUPPORT:
182                         status = -EINVAL;
183                         break;
184                 case -ECONNREFUSED:
185                 case -ETIMEDOUT:
186                 case -ENOTCONN:
187                         status = -EAGAIN;
188                         break;
189                 case -ERESTARTSYS:
190                         if (signalled ())
191                                 status = -EINTR;
192                         break;
193                 default:
194                         break;
195                 }
196         }
197         rpc_release_client(clnt);
198         return status;
199 }
200 
201 static void gssp_free_receive_pages(struct gssx_arg_accept_sec_context *arg)
202 {
203         int i;
204 
205         for (i = 0; i < arg->npages && arg->pages[i]; i++)
206                 __free_page(arg->pages[i]);
207 
208         kfree(arg->pages);
209 }
210 
211 static int gssp_alloc_receive_pages(struct gssx_arg_accept_sec_context *arg)
212 {
213         arg->npages = DIV_ROUND_UP(NGROUPS_MAX * 4, PAGE_SIZE);
214         arg->pages = kcalloc(arg->npages, sizeof(struct page *), GFP_KERNEL);
215         /*
216          * XXX: actual pages are allocated by xdr layer in
217          * xdr_partial_copy_from_skb.
218          */
219         if (!arg->pages)
220                 return -ENOMEM;
221         return 0;
222 }
223 
224 static char *gssp_stringify(struct xdr_netobj *netobj)
225 {
226         return kstrndup(netobj->data, netobj->len, GFP_KERNEL);
227 }
228 
229 static void gssp_hostbased_service(char **principal)
230 {
231         char *c;
232 
233         if (!*principal)
234                 return;
235 
236         /* terminate and remove realm part */
237         c = strchr(*principal, '@');
238         if (c) {
239                 *c = '\0';
240 
241                 /* change service-hostname delimiter */
242                 c = strchr(*principal, '/');
243                 if (c)
244                         *c = '@';
245         }
246         if (!c) {
247                 /* not a service principal */
248                 kfree(*principal);
249                 *principal = NULL;
250         }
251 }
252 
253 /*
254  * Public functions
255  */
256 
257 /* numbers somewhat arbitrary but large enough for current needs */
258 #define GSSX_MAX_OUT_HANDLE     128
259 #define GSSX_MAX_SRC_PRINC      256
260 #define GSSX_KMEMBUF (GSSX_max_output_handle_sz + \
261                         GSSX_max_oid_sz + \
262                         GSSX_max_princ_sz + \
263                         sizeof(struct svc_cred))
264 
265 int gssp_accept_sec_context_upcall(struct net *net,
266                                 struct gssp_upcall_data *data)
267 {
268         struct gssx_ctx ctxh = {
269                 .state = data->in_handle
270         };
271         struct gssx_arg_accept_sec_context arg = {
272                 .input_token = data->in_token,
273         };
274         struct gssx_ctx rctxh = {
275                 /*
276                  * pass in the max length we expect for each of these
277                  * buffers but let the xdr code kmalloc them:
278                  */
279                 .exported_context_token.len = GSSX_max_output_handle_sz,
280                 .mech.len = GSS_OID_MAX_LEN,
281                 .targ_name.display_name.len = GSSX_max_princ_sz,
282                 .src_name.display_name.len = GSSX_max_princ_sz
283         };
284         struct gssx_res_accept_sec_context res = {
285                 .context_handle = &rctxh,
286                 .output_token = &data->out_token
287         };
288         struct rpc_message msg = {
289                 .rpc_proc = &gssp_procedures[GSSX_ACCEPT_SEC_CONTEXT],
290                 .rpc_argp = &arg,
291                 .rpc_resp = &res,
292                 .rpc_cred = NULL, /* FIXME ? */
293         };
294         struct xdr_netobj client_name = { 0 , NULL };
295         struct xdr_netobj target_name = { 0, NULL };
296         int ret;
297 
298         if (data->in_handle.len != 0)
299                 arg.context_handle = &ctxh;
300         res.output_token->len = GSSX_max_output_token_sz;
301 
302         ret = gssp_alloc_receive_pages(&arg);
303         if (ret)
304                 return ret;
305 
306         ret = gssp_call(net, &msg);
307 
308         gssp_free_receive_pages(&arg);
309 
310         /* we need to fetch all data even in case of error so
311          * that we can free special strctures is they have been allocated */
312         data->major_status = res.status.major_status;
313         data->minor_status = res.status.minor_status;
314         if (res.context_handle) {
315                 data->out_handle = rctxh.exported_context_token;
316                 data->mech_oid.len = rctxh.mech.len;
317                 if (rctxh.mech.data) {
318                         memcpy(data->mech_oid.data, rctxh.mech.data,
319                                                 data->mech_oid.len);
320                         kfree(rctxh.mech.data);
321                 }
322                 client_name = rctxh.src_name.display_name;
323                 target_name = rctxh.targ_name.display_name;
324         }
325 
326         if (res.options.count == 1) {
327                 gssx_buffer *value = &res.options.data[0].value;
328                 /* Currently we only decode CREDS_VALUE, if we add
329                  * anything else we'll have to loop and match on the
330                  * option name */
331                 if (value->len == 1) {
332                         /* steal group info from struct svc_cred */
333                         data->creds = *(struct svc_cred *)value->data;
334                         data->found_creds = 1;
335                 }
336                 /* whether we use it or not, free data */
337                 kfree(value->data);
338         }
339 
340         if (res.options.count != 0) {
341                 kfree(res.options.data);
342         }
343 
344         /* convert to GSS_NT_HOSTBASED_SERVICE form and set into creds */
345         if (data->found_creds) {
346                 if (client_name.data) {
347                         data->creds.cr_raw_principal =
348                                         gssp_stringify(&client_name);
349                         data->creds.cr_principal =
350                                         gssp_stringify(&client_name);
351                         gssp_hostbased_service(&data->creds.cr_principal);
352                 }
353                 if (target_name.data) {
354                         data->creds.cr_targ_princ =
355                                         gssp_stringify(&target_name);
356                         gssp_hostbased_service(&data->creds.cr_targ_princ);
357                 }
358         }
359         kfree(client_name.data);
360         kfree(target_name.data);
361 
362         return ret;
363 }
364 
365 void gssp_free_upcall_data(struct gssp_upcall_data *data)
366 {
367         kfree(data->in_handle.data);
368         kfree(data->out_handle.data);
369         kfree(data->out_token.data);
370         free_svc_cred(&data->creds);
371 }
372 
373 /*
374  * Initialization stuff
375  */
376 static unsigned int gssp_version1_counts[ARRAY_SIZE(gssp_procedures)];
377 static const struct rpc_version gssp_version1 = {
378         .number         = GSSPROXY_VERS_1,
379         .nrprocs        = ARRAY_SIZE(gssp_procedures),
380         .procs          = gssp_procedures,
381         .counts         = gssp_version1_counts,
382 };
383 
384 static const struct rpc_version *gssp_version[] = {
385         NULL,
386         &gssp_version1,
387 };
388 
389 static struct rpc_stat gssp_stats;
390 
391 static const struct rpc_program gssp_program = {
392         .name           = "gssproxy",
393         .number         = GSSPROXY_PROGRAM,
394         .nrvers         = ARRAY_SIZE(gssp_version),
395         .version        = gssp_version,
396         .stats          = &gssp_stats,
397 };
398 

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