1// SPDX-License-Identifier: BSD-3-Clause
  2/*
  3 *  linux/net/sunrpc/gss_mech_switch.c
  4 *
  5 *  Copyright (c) 2001 The Regents of the University of Michigan.
  6 *  All rights reserved.
  7 *
  8 *  J. Bruce Fields   <bfields@umich.edu>
  9 */
 10
 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#include <trace/events/rpcgss.h>
 24
 25#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
 26# define RPCDBG_FACILITY        RPCDBG_AUTH
 27#endif
 28
 29static LIST_HEAD(registered_mechs);
 30static DEFINE_SPINLOCK(registered_mechs_lock);
 31
 32static void
 33gss_mech_free(struct gss_api_mech *gm)
 34{
 35	struct pf_desc *pf;
 36	int i;
 37
 38	for (i = 0; i < gm->gm_pf_num; i++) {
 39		pf = &gm->gm_pfs[i];
 40		if (pf->domain)
 41			auth_domain_put(pf->domain);
 42		kfree(pf->auth_domain_name);
 43		pf->auth_domain_name = NULL;
 44	}
 45}
 46
 47static inline char *
 48make_auth_domain_name(char *name)
 49{
 50	static char	*prefix = "gss/";
 51	char		*new;
 52
 53	new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
 54	if (new) {
 55		strcpy(new, prefix);
 56		strcat(new, name);
 57	}
 58	return new;
 59}
 60
 61static int
 62gss_mech_svc_setup(struct gss_api_mech *gm)
 63{
 64	struct auth_domain *dom;
 65	struct pf_desc *pf;
 66	int i, status;
 67
 68	for (i = 0; i < gm->gm_pf_num; i++) {
 69		pf = &gm->gm_pfs[i];
 70		pf->auth_domain_name = make_auth_domain_name(pf->name);
 71		status = -ENOMEM;
 72		if (pf->auth_domain_name == NULL)
 73			goto out;
 74		dom = svcauth_gss_register_pseudoflavor(
 75			pf->pseudoflavor, pf->auth_domain_name);
 76		if (IS_ERR(dom)) {
 77			status = PTR_ERR(dom);
 78			goto out;
 79		}
 80		pf->domain = dom;
 81	}
 82	return 0;
 83out:
 84	gss_mech_free(gm);
 85	return status;
 86}
 87
 88/**
 89 * gss_mech_register - register a GSS mechanism
 90 * @gm: GSS mechanism handle
 91 *
 92 * Returns zero if successful, or a negative errno.
 93 */
 94int gss_mech_register(struct gss_api_mech *gm)
 95{
 96	int status;
 97
 98	status = gss_mech_svc_setup(gm);
 99	if (status)
100		return status;
101	spin_lock(&registered_mechs_lock);
102	list_add_rcu(&gm->gm_list, &registered_mechs);
103	spin_unlock(&registered_mechs_lock);
104	dprintk("RPC:       registered gss mechanism %s\n", gm->gm_name);
105	return 0;
106}
107EXPORT_SYMBOL_GPL(gss_mech_register);
108
109/**
110 * gss_mech_unregister - release a GSS mechanism
111 * @gm: GSS mechanism handle
112 *
113 */
114void gss_mech_unregister(struct gss_api_mech *gm)
115{
116	spin_lock(&registered_mechs_lock);
117	list_del_rcu(&gm->gm_list);
118	spin_unlock(&registered_mechs_lock);
119	dprintk("RPC:       unregistered gss mechanism %s\n", gm->gm_name);
120	gss_mech_free(gm);
121}
122EXPORT_SYMBOL_GPL(gss_mech_unregister);
123
124struct gss_api_mech *gss_mech_get(struct gss_api_mech *gm)
125{
126	__module_get(gm->gm_owner);
127	return gm;
128}
129EXPORT_SYMBOL(gss_mech_get);
130
131static struct gss_api_mech *
132_gss_mech_get_by_name(const char *name)
133{
134	struct gss_api_mech	*pos, *gm = NULL;
135
136	rcu_read_lock();
137	list_for_each_entry_rcu(pos, &registered_mechs, gm_list) {
138		if (0 == strcmp(name, pos->gm_name)) {
139			if (try_module_get(pos->gm_owner))
140				gm = pos;
141			break;
142		}
143	}
144	rcu_read_unlock();
145	return gm;
146
147}
148
149struct gss_api_mech * gss_mech_get_by_name(const char *name)
150{
151	struct gss_api_mech *gm = NULL;
152
153	gm = _gss_mech_get_by_name(name);
154	if (!gm) {
155		request_module("rpc-auth-gss-%s", name);
156		gm = _gss_mech_get_by_name(name);
157	}
158	return gm;
159}
160
161struct gss_api_mech *gss_mech_get_by_OID(struct rpcsec_gss_oid *obj)
162{
163	struct gss_api_mech	*pos, *gm = NULL;
164	char buf[32];
165
166	if (sprint_oid(obj->data, obj->len, buf, sizeof(buf)) < 0)
167		return NULL;
 
168	request_module("rpc-auth-gss-%s", buf);
169
170	rcu_read_lock();
171	list_for_each_entry_rcu(pos, &registered_mechs, gm_list) {
172		if (obj->len == pos->gm_oid.len) {
173			if (0 == memcmp(obj->data, pos->gm_oid.data, obj->len)) {
174				if (try_module_get(pos->gm_owner))
175					gm = pos;
176				break;
177			}
178		}
179	}
180	rcu_read_unlock();
181	if (!gm)
182		trace_rpcgss_oid_to_mech(buf);
183	return gm;
184}
185
186static inline int
187mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
188{
189	int i;
190
191	for (i = 0; i < gm->gm_pf_num; i++) {
192		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
193			return 1;
194	}
195	return 0;
196}
197
198static struct gss_api_mech *_gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
199{
200	struct gss_api_mech *gm = NULL, *pos;
201
202	rcu_read_lock();
203	list_for_each_entry_rcu(pos, &registered_mechs, gm_list) {
204		if (!mech_supports_pseudoflavor(pos, pseudoflavor))
205			continue;
206		if (try_module_get(pos->gm_owner))
207			gm = pos;
208		break;
209	}
210	rcu_read_unlock();
211	return gm;
212}
213
214struct gss_api_mech *
215gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
216{
217	struct gss_api_mech *gm;
218
219	gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
220
221	if (!gm) {
222		request_module("rpc-auth-gss-%u", pseudoflavor);
223		gm = _gss_mech_get_by_pseudoflavor(pseudoflavor);
224	}
225	return gm;
226}
227
228/**
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
229 * gss_svc_to_pseudoflavor - map a GSS service number to a pseudoflavor
230 * @gm: GSS mechanism handle
231 * @qop: GSS quality-of-protection value
232 * @service: GSS service value
233 *
234 * Returns a matching security flavor, or RPC_AUTH_MAXFLAVOR if none is found.
235 */
236rpc_authflavor_t gss_svc_to_pseudoflavor(struct gss_api_mech *gm, u32 qop,
237					 u32 service)
238{
239	int i;
240
241	for (i = 0; i < gm->gm_pf_num; i++) {
242		if (gm->gm_pfs[i].qop == qop &&
243		    gm->gm_pfs[i].service == service) {
244			return gm->gm_pfs[i].pseudoflavor;
245		}
246	}
247	return RPC_AUTH_MAXFLAVOR;
248}
249
250/**
251 * gss_mech_info2flavor - look up a pseudoflavor given a GSS tuple
252 * @info: a GSS mech OID, quality of protection, and service value
253 *
254 * Returns a matching pseudoflavor, or RPC_AUTH_MAXFLAVOR if the tuple is
255 * not supported.
256 */
257rpc_authflavor_t gss_mech_info2flavor(struct rpcsec_gss_info *info)
258{
259	rpc_authflavor_t pseudoflavor;
260	struct gss_api_mech *gm;
261
262	gm = gss_mech_get_by_OID(&info->oid);
263	if (gm == NULL)
264		return RPC_AUTH_MAXFLAVOR;
265
266	pseudoflavor = gss_svc_to_pseudoflavor(gm, info->qop, info->service);
267
268	gss_mech_put(gm);
269	return pseudoflavor;
270}
271
272/**
273 * gss_mech_flavor2info - look up a GSS tuple for a given pseudoflavor
274 * @pseudoflavor: GSS pseudoflavor to match
275 * @info: rpcsec_gss_info structure to fill in
276 *
277 * Returns zero and fills in "info" if pseudoflavor matches a
278 * supported mechanism.  Otherwise a negative errno is returned.
279 */
280int gss_mech_flavor2info(rpc_authflavor_t pseudoflavor,
281			 struct rpcsec_gss_info *info)
282{
283	struct gss_api_mech *gm;
284	int i;
285
286	gm = gss_mech_get_by_pseudoflavor(pseudoflavor);
287	if (gm == NULL)
288		return -ENOENT;
289
290	for (i = 0; i < gm->gm_pf_num; i++) {
291		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor) {
292			memcpy(info->oid.data, gm->gm_oid.data, gm->gm_oid.len);
293			info->oid.len = gm->gm_oid.len;
294			info->qop = gm->gm_pfs[i].qop;
295			info->service = gm->gm_pfs[i].service;
296			gss_mech_put(gm);
297			return 0;
298		}
299	}
300
301	gss_mech_put(gm);
302	return -ENOENT;
303}
304
305u32
306gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
307{
308	int i;
309
310	for (i = 0; i < gm->gm_pf_num; i++) {
311		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
312			return gm->gm_pfs[i].service;
313	}
314	return 0;
315}
316EXPORT_SYMBOL(gss_pseudoflavor_to_service);
317
318bool
319gss_pseudoflavor_to_datatouch(struct gss_api_mech *gm, u32 pseudoflavor)
320{
321	int i;
322
323	for (i = 0; i < gm->gm_pf_num; i++) {
324		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
325			return gm->gm_pfs[i].datatouch;
326	}
327	return false;
328}
329
330char *
331gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
332{
333	int i;
334
335	for (i = 0; i < gm->gm_pf_num; i++) {
336		if (gm->gm_pfs[i].service == service)
337			return gm->gm_pfs[i].auth_domain_name;
338	}
339	return NULL;
340}
341
342void
343gss_mech_put(struct gss_api_mech * gm)
344{
345	if (gm)
346		module_put(gm->gm_owner);
347}
348EXPORT_SYMBOL(gss_mech_put);
349
350/* The mech could probably be determined from the token instead, but it's just
351 * as easy for now to pass it in. */
352int
353gss_import_sec_context(const void *input_token, size_t bufsize,
354		       struct gss_api_mech	*mech,
355		       struct gss_ctx		**ctx_id,
356		       time64_t			*endtime,
357		       gfp_t gfp_mask)
358{
359	if (!(*ctx_id = kzalloc(sizeof(**ctx_id), gfp_mask)))
360		return -ENOMEM;
361	(*ctx_id)->mech_type = gss_mech_get(mech);
362
363	return mech->gm_ops->gss_import_sec_context(input_token, bufsize,
364						*ctx_id, endtime, gfp_mask);
365}
366
367/* gss_get_mic: compute a mic over message and return mic_token. */
368
369u32
370gss_get_mic(struct gss_ctx	*context_handle,
371	    struct xdr_buf	*message,
372	    struct xdr_netobj	*mic_token)
373{
374	 return context_handle->mech_type->gm_ops
375		->gss_get_mic(context_handle,
376			      message,
377			      mic_token);
378}
379
380/* gss_verify_mic: check whether the provided mic_token verifies message. */
381
382u32
383gss_verify_mic(struct gss_ctx		*context_handle,
384	       struct xdr_buf		*message,
385	       struct xdr_netobj	*mic_token)
386{
387	return context_handle->mech_type->gm_ops
388		->gss_verify_mic(context_handle,
389				 message,
390				 mic_token);
391}
392
393/*
394 * This function is called from both the client and server code.
395 * Each makes guarantees about how much "slack" space is available
396 * for the underlying function in "buf"'s head and tail while
397 * performing the wrap.
398 *
399 * The client and server code allocate RPC_MAX_AUTH_SIZE extra
400 * space in both the head and tail which is available for use by
401 * the wrap function.
402 *
403 * Underlying functions should verify they do not use more than
404 * RPC_MAX_AUTH_SIZE of extra space in either the head or tail
405 * when performing the wrap.
406 */
407u32
408gss_wrap(struct gss_ctx	*ctx_id,
409	 int		offset,
410	 struct xdr_buf	*buf,
411	 struct page	**inpages)
412{
413	return ctx_id->mech_type->gm_ops
414		->gss_wrap(ctx_id, offset, buf, inpages);
415}
416
417u32
418gss_unwrap(struct gss_ctx	*ctx_id,
419	   int			offset,
420	   int			len,
421	   struct xdr_buf	*buf)
422{
423	return ctx_id->mech_type->gm_ops
424		->gss_unwrap(ctx_id, offset, len, buf);
425}
426
427
428/* gss_delete_sec_context: free all resources associated with context_handle.
429 * Note this differs from the RFC 2744-specified prototype in that we don't
430 * bother returning an output token, since it would never be used anyway. */
431
432u32
433gss_delete_sec_context(struct gss_ctx	**context_handle)
434{
435	dprintk("RPC:       gss_delete_sec_context deleting %p\n",
436			*context_handle);
437
438	if (!*context_handle)
439		return GSS_S_NO_CONTEXT;
440	if ((*context_handle)->internal_ctx_id)
441		(*context_handle)->mech_type->gm_ops
442			->gss_delete_sec_context((*context_handle)
443							->internal_ctx_id);
444	gss_mech_put((*context_handle)->mech_type);
445	kfree(*context_handle);
446	*context_handle=NULL;
447	return GSS_S_COMPLETE;
448}

  1// SPDX-License-Identifier: BSD-3-Clause
  2/*
  3 *  linux/net/sunrpc/gss_mech_switch.c
  4 *
  5 *  Copyright (c) 2001 The Regents of the University of Michigan.
  6 *  All rights reserved.
  7 *
  8 *  J. Bruce Fields   <bfields@umich.edu>
  9 */
 10
 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 * gss_mech_register - register a GSS mechanism
 83 * @gm: GSS mechanism handle
 84 *
 85 * Returns zero if successful, or a negative errno.
 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(&registered_mechs_lock);
 95	list_add_rcu(&gm->gm_list, &registered_mechs);
 96	spin_unlock(&registered_mechs_lock);
 97	dprintk("RPC:       registered gss mechanism %s\n", gm->gm_name);
 98	return 0;
 99}
100EXPORT_SYMBOL_GPL(gss_mech_register);
101
102/**
103 * gss_mech_unregister - release a GSS mechanism
104 * @gm: GSS mechanism handle
105 *
106 */
107void gss_mech_unregister(struct gss_api_mech *gm)
108{
109	spin_lock(&registered_mechs_lock);
110	list_del_rcu(&gm->gm_list);
111	spin_unlock(&registered_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, &registered_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, &registered_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, &registered_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}
219
220/**
221 * gss_mech_list_pseudoflavors - Discover registered GSS pseudoflavors
222 * @array_ptr: array to fill in
223 * @size: size of "array"
224 *
225 * Returns the number of array items filled in, or a negative errno.
226 *
227 * The returned array is not sorted by any policy.  Callers should not
228 * rely on the order of the items in the returned array.
229 */
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, &registered_mechs, gm_list) {
237		for (j = 0; j < pos->gm_pf_num; j++) {
238			if (i >= size) {
239				spin_unlock(&registered_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}
248
249/**
250 * gss_svc_to_pseudoflavor - map a GSS service number to a pseudoflavor
251 * @gm: GSS mechanism handle
252 * @qop: GSS quality-of-protection value
253 * @service: GSS service value
254 *
255 * Returns a matching security flavor, or RPC_AUTH_MAXFLAVOR if none is found.
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}
270
271/**
272 * gss_mech_info2flavor - look up a pseudoflavor given a GSS tuple
273 * @info: a GSS mech OID, quality of protection, and service value
274 *
275 * Returns a matching pseudoflavor, or RPC_AUTH_MAXFLAVOR if the tuple is
276 * not supported.
277 */
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}
292
293/**
294 * gss_mech_flavor2info - look up a GSS tuple for a given pseudoflavor
295 * @pseudoflavor: GSS pseudoflavor to match
296 * @info: rpcsec_gss_info structure to fill in
297 *
298 * Returns zero and fills in "info" if pseudoflavor matches a
299 * supported mechanism.  Otherwise a negative errno is returned.
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/* The mech could probably be determined from the token instead, but it's just
372 * as easy for now to pass it in. */
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
388/* gss_get_mic: compute a mic over message and return mic_token. */
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/* gss_verify_mic: check whether the provided mic_token verifies message. */
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}
413
414/*
415 * This function is called from both the client and server code.
416 * Each makes guarantees about how much "slack" space is available
417 * for the underlying function in "buf"'s head and tail while
418 * performing the wrap.
419 *
420 * The client and server code allocate RPC_MAX_AUTH_SIZE extra
421 * space in both the head and tail which is available for use by
422 * the wrap function.
423 *
424 * Underlying functions should verify they do not use more than
425 * RPC_MAX_AUTH_SIZE of extra space in either the head or tail
426 * when performing the wrap.
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
447
448/* gss_delete_sec_context: free all resources associated with context_handle.
449 * Note this differs from the RFC 2744-specified prototype in that we don't
450 * bother returning an output token, since it would never be used anyway. */
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}