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11#include <linux/types.h>
12#include <linux/slab.h>
13#include <linux/module.h>
14#include <linux/oid_registry.h>
15#include <linux/sunrpc/msg_prot.h>
16#include <linux/sunrpc/gss_asn1.h>
17#include <linux/sunrpc/auth_gss.h>
18#include <linux/sunrpc/svcauth_gss.h>
19#include <linux/sunrpc/gss_err.h>
20#include <linux/sunrpc/sched.h>
21#include <linux/sunrpc/gss_api.h>
22#include <linux/sunrpc/clnt.h>
23
24#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
25# define RPCDBG_FACILITY RPCDBG_AUTH
26#endif
27
28static LIST_HEAD(registered_mechs);
29static DEFINE_SPINLOCK(registered_mechs_lock);
30
31static void
32gss_mech_free(struct gss_api_mech *gm)
33{
34 struct pf_desc *pf;
35 int i;
36
37 for (i = 0; i < gm->gm_pf_num; i++) {
38 pf = &gm->gm_pfs[i];
39 kfree(pf->auth_domain_name);
40 pf->auth_domain_name = NULL;
41 }
42}
43
44static inline char *
45make_auth_domain_name(char *name)
46{
47 static char *prefix = "gss/";
48 char *new;
49
50 new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
51 if (new) {
52 strcpy(new, prefix);
53 strcat(new, name);
54 }
55 return new;
56}
57
58static int
59gss_mech_svc_setup(struct gss_api_mech *gm)
60{
61 struct pf_desc *pf;
62 int i, status;
63
64 for (i = 0; i < gm->gm_pf_num; i++) {
65 pf = &gm->gm_pfs[i];
66 pf->auth_domain_name = make_auth_domain_name(pf->name);
67 status = -ENOMEM;
68 if (pf->auth_domain_name == NULL)
69 goto out;
70 status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
71 pf->auth_domain_name);
72 if (status)
73 goto out;
74 }
75 return 0;
76out:
77 gss_mech_free(gm);
78 return status;
79}
80
81
82
83
84
85
86
87int gss_mech_register(struct gss_api_mech *gm)
88{
89 int status;
90
91 status = gss_mech_svc_setup(gm);
92 if (status)
93 return status;
94 spin_lock(®istered_mechs_lock);
95 list_add_rcu(&gm->gm_list, ®istered_mechs);
96 spin_unlock(®istered_mechs_lock);
97 dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
98 return 0;
99}
100EXPORT_SYMBOL_GPL(gss_mech_register);
101
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105
106
107void gss_mech_unregister(struct gss_api_mech *gm)
108{
109 spin_lock(®istered_mechs_lock);
110 list_del_rcu(&gm->gm_list);
111 spin_unlock(®istered_mechs_lock);
112 dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
113 gss_mech_free(gm);
114}
115EXPORT_SYMBOL_GPL(gss_mech_unregister);
116
117struct gss_api_mech *gss_mech_get(struct gss_api_mech *gm)
118{
119 __module_get(gm->gm_owner);
120 return gm;
121}
122EXPORT_SYMBOL(gss_mech_get);
123
124static struct gss_api_mech *
125_gss_mech_get_by_name(const char *name)
126{
127 struct gss_api_mech *pos, *gm = NULL;
128
129 rcu_read_lock();
130 list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
131 if (0 == strcmp(name, pos->gm_name)) {
132 if (try_module_get(pos->gm_owner))
133 gm = pos;
134 break;
135 }
136 }
137 rcu_read_unlock();
138 return gm;
139
140}
141
142struct gss_api_mech * gss_mech_get_by_name(const char *name)
143{
144 struct gss_api_mech *gm = NULL;
145
146 gm = _gss_mech_get_by_name(name);
147 if (!gm) {
148 request_module("rpc-auth-gss-%s", name);
149 gm = _gss_mech_get_by_name(name);
150 }
151 return gm;
152}
153
154struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
155{
156 struct gss_api_mech *pos, *gm = NULL;
157 char buf[32];
158
159 if (sprint_oid(obj->data, obj->len, buf, sizeof(buf)) < 0)
160 return NULL;
161 dprintk("RPC: %s(%s)\n", __func__, buf);
162 request_module("rpc-auth-gss-%s", buf);
163
164 rcu_read_lock();
165 list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
166 if (obj->len == pos->gm_oid.len) {
167 if (0 == memcmp(obj->data, pos->gm_oid.data, obj->len)) {
168 if (try_module_get(pos->gm_owner))
169 gm = pos;
170 break;
171 }
172 }
173 }
174 rcu_read_unlock();
175 return gm;
176}
177
178static inline int
179mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
180{
181 int i;
182
183 for (i = 0; i < gm->gm_pf_num; i++) {
184 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
185 return 1;
186 }
187 return 0;
188}
189
190static struct gss_api_mech *_gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
191{
192 struct gss_api_mech *gm = NULL, *pos;
193
194 rcu_read_lock();
195 list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
196 if (!mech_supports_pseudoflavor(pos, pseudoflavor))
197 continue;
198 if (try_module_get(pos->gm_owner))
199 gm = pos;
200 break;
201 }
202 rcu_read_unlock();
203 return gm;
204}
205
206struct gss_api_mech *
207gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
208{
209 struct gss_api_mech *gm;
210
211 gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
212
213 if (!gm) {
214 request_module("rpc-auth-gss-%u", pseudoflavor);
215 gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
216 }
217 return gm;
218}
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230int gss_mech_list_pseudoflavors(rpc_authflavor_t *array_ptr, int size)
231{
232 struct gss_api_mech *pos = NULL;
233 int j, i = 0;
234
235 rcu_read_lock();
236 list_for_each_entry_rcu(pos, ®istered_mechs, gm_list) {
237 for (j = 0; j < pos->gm_pf_num; j++) {
238 if (i >= size) {
239 spin_unlock(®istered_mechs_lock);
240 return -ENOMEM;
241 }
242 array_ptr[i++] = pos->gm_pfs[j].pseudoflavor;
243 }
244 }
245 rcu_read_unlock();
246 return i;
247}
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256
257rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 qop,
258 u32 service)
259{
260 int i;
261
262 for (i = 0; i < gm->gm_pf_num; i++) {
263 if (gm->gm_pfs[i].qop == qop &&
264 gm->gm_pfs[i].service == service) {
265 return gm->gm_pfs[i].pseudoflavor;
266 }
267 }
268 return RPC_AUTH_MAXFLAVOR;
269}
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278rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *info)
279{
280 rpc_authflavor_t pseudoflavor;
281 struct gss_api_mech *gm;
282
283 gm = gss_mech_get_by_OID(&info->oid);
284 if (gm == NULL)
285 return RPC_AUTH_MAXFLAVOR;
286
287 pseudoflavor = gss_svc_to_pseudoflavor(gm, info->qop, info->service);
288
289 gss_mech_put(gm);
290 return pseudoflavor;
291}
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300
301int gss_mech_flavor2info(rpc_authflavor_t pseudoflavor,
302 struct rpcsec_gss_info *info)
303{
304 struct gss_api_mech *gm;
305 int i;
306
307 gm = gss_mech_get_by_pseudoflavor(pseudoflavor);
308 if (gm == NULL)
309 return -ENOENT;
310
311 for (i = 0; i < gm->gm_pf_num; i++) {
312 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) {
313 memcpy(info->oid.data, gm->gm_oid.data, gm->gm_oid.len);
314 info->oid.len = gm->gm_oid.len;
315 info->qop = gm->gm_pfs[i].qop;
316 info->service = gm->gm_pfs[i].service;
317 gss_mech_put(gm);
318 return 0;
319 }
320 }
321
322 gss_mech_put(gm);
323 return -ENOENT;
324}
325
326u32
327gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
328{
329 int i;
330
331 for (i = 0; i < gm->gm_pf_num; i++) {
332 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
333 return gm->gm_pfs[i].service;
334 }
335 return 0;
336}
337EXPORT_SYMBOL(gss_pseudoflavor_to_service);
338
339bool
340gss_pseudoflavor_to_datatouch(struct gss_api_mech *gm, u32 pseudoflavor)
341{
342 int i;
343
344 for (i = 0; i < gm->gm_pf_num; i++) {
345 if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
346 return gm->gm_pfs[i].datatouch;
347 }
348 return false;
349}
350
351char *
352gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
353{
354 int i;
355
356 for (i = 0; i < gm->gm_pf_num; i++) {
357 if (gm->gm_pfs[i].service == service)
358 return gm->gm_pfs[i].auth_domain_name;
359 }
360 return NULL;
361}
362
363void
364gss_mech_put(struct gss_api_mech * gm)
365{
366 if (gm)
367 module_put(gm->gm_owner);
368}
369EXPORT_SYMBOL(gss_mech_put);
370
371
372
373int
374gss_import_sec_context(const void *input_token, size_t bufsize,
375 struct gss_api_mech *mech,
376 struct gss_ctx **ctx_id,
377 time_t *endtime,
378 gfp_t gfp_mask)
379{
380 if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
381 return -ENOMEM;
382 (*ctx_id)->mech_type = gss_mech_get(mech);
383
384 return mech->gm_ops->gss_import_sec_context(input_token, bufsize,
385 *ctx_id, endtime, gfp_mask);
386}
387
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389
390u32
391gss_get_mic(struct gss_ctx *context_handle,
392 struct xdr_buf *message,
393 struct xdr_netobj *mic_token)
394{
395 return context_handle->mech_type->gm_ops
396 ->gss_get_mic(context_handle,
397 message,
398 mic_token);
399}
400
401
402
403u32
404gss_verify_mic(struct gss_ctx *context_handle,
405 struct xdr_buf *message,
406 struct xdr_netobj *mic_token)
407{
408 return context_handle->mech_type->gm_ops
409 ->gss_verify_mic(context_handle,
410 message,
411 mic_token);
412}
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427
428u32
429gss_wrap(struct gss_ctx *ctx_id,
430 int offset,
431 struct xdr_buf *buf,
432 struct page **inpages)
433{
434 return ctx_id->mech_type->gm_ops
435 ->gss_wrap(ctx_id, offset, buf, inpages);
436}
437
438u32
439gss_unwrap(struct gss_ctx *ctx_id,
440 int offset,
441 struct xdr_buf *buf)
442{
443 return ctx_id->mech_type->gm_ops
444 ->gss_unwrap(ctx_id, offset, buf);
445}
446
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450
451
452u32
453gss_delete_sec_context(struct gss_ctx **context_handle)
454{
455 dprintk("RPC: gss_delete_sec_context deleting %p\n",
456 *context_handle);
457
458 if (!*context_handle)
459 return GSS_S_NO_CONTEXT;
460 if ((*context_handle)->internal_ctx_id)
461 (*context_handle)->mech_type->gm_ops
462 ->gss_delete_sec_context((*context_handle)
463 ->internal_ctx_id);
464 gss_mech_put((*context_handle)->mech_type);
465 kfree(*context_handle);
466 *context_handle=NULL;
467 return GSS_S_COMPLETE;
468}
469