[linux-2.6-block.git] / net / sunrpc / auth_gss / gss_mech_switch.c

/*
 *  linux/net/sunrpc/gss_mech_switch.c
 *
 *  Copyright (c) 2001 The Regents of the University of Michigan.
 *  All rights reserved.
 *
 *  J. Bruce Fields   <bfields@umich.edu>
 *
 *  Redistribution and use in source and binary forms, with or without 
 *  modification, are permitted provided that the following conditions
 *  are met:
 *
 *  1. Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *  2. Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the 
 *     documentation and/or other materials provided with the distribution.
 *  3. Neither the name of the University nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
 *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *  DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 *  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
 *  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 *  LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 *  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include <linux/types.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/sunrpc/msg_prot.h>
#include <linux/sunrpc/gss_asn1.h>
#include <linux/sunrpc/auth_gss.h>
#include <linux/sunrpc/svcauth_gss.h>
#include <linux/sunrpc/gss_err.h>
#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/gss_api.h>
#include <linux/sunrpc/clnt.h>

#ifdef RPC_DEBUG
# define RPCDBG_FACILITY        RPCDBG_AUTH
#endif

static LIST_HEAD(registered_mechs);
static DEFINE_SPINLOCK(registered_mechs_lock);

static void
gss_mech_free(struct gss_api_mech *gm)
{
	struct pf_desc *pf;
	int i;

	for (i = 0; i < gm->gm_pf_num; i++) {
		pf = &gm->gm_pfs[i];
		if (pf->auth_domain_name)
			kfree(pf->auth_domain_name);
		pf->auth_domain_name = NULL;
	}
}

static inline char *
make_auth_domain_name(char *name)
{
	static char	*prefix = "gss/";
	char		*new;

	new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
	if (new) {
		strcpy(new, prefix);
		strcat(new, name);
	}
	return new;
}

static int
gss_mech_svc_setup(struct gss_api_mech *gm)
{
	struct pf_desc *pf;
	int i, status;

	for (i = 0; i < gm->gm_pf_num; i++) {
		pf = &gm->gm_pfs[i];
		pf->auth_domain_name = make_auth_domain_name(pf->name);
		status = -ENOMEM;
		if (pf->auth_domain_name == NULL)
			goto out;
		status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
							pf->auth_domain_name);
		if (status)
			goto out;
	}
	return 0;
out:
	gss_mech_free(gm);
	return status;
}

int
gss_mech_register(struct gss_api_mech *gm)
{
	int status;

	status = gss_mech_svc_setup(gm);
	if (status)
		return status;
	spin_lock(&registered_mechs_lock);
	list_add(&gm->gm_list, &registered_mechs);
	spin_unlock(&registered_mechs_lock);
	dprintk("RPC:      registered gss mechanism %s\n", gm->gm_name);
	return 0;
}

EXPORT_SYMBOL(gss_mech_register);

void
gss_mech_unregister(struct gss_api_mech *gm)
{
	spin_lock(&registered_mechs_lock);
	list_del(&gm->gm_list);
	spin_unlock(&registered_mechs_lock);
	dprintk("RPC:      unregistered gss mechanism %s\n", gm->gm_name);
	gss_mech_free(gm);
}

EXPORT_SYMBOL(gss_mech_unregister);

struct gss_api_mech *
gss_mech_get(struct gss_api_mech *gm)
{
	__module_get(gm->gm_owner);
	return gm;
}

EXPORT_SYMBOL(gss_mech_get);

struct gss_api_mech *
gss_mech_get_by_name(const char *name)
{
	struct gss_api_mech	*pos, *gm = NULL;

	spin_lock(&registered_mechs_lock);
	list_for_each_entry(pos, &registered_mechs, gm_list) {
		if (0 == strcmp(name, pos->gm_name)) {
			if (try_module_get(pos->gm_owner))
				gm = pos;
			break;
		}
	}
	spin_unlock(&registered_mechs_lock);
	return gm;

}

EXPORT_SYMBOL(gss_mech_get_by_name);

static inline int
mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
{
	int i;

	for (i = 0; i < gm->gm_pf_num; i++) {
		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
			return 1;
	}
	return 0;
}

struct gss_api_mech *
gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
{
	struct gss_api_mech *pos, *gm = NULL;

	spin_lock(&registered_mechs_lock);
	list_for_each_entry(pos, &registered_mechs, gm_list) {
		if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
			module_put(pos->gm_owner);
			continue;
		}
		if (try_module_get(pos->gm_owner))
			gm = pos;
		break;
	}
	spin_unlock(&registered_mechs_lock);
	return gm;
}

EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);

u32
gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
{
	int i;

	for (i = 0; i < gm->gm_pf_num; i++) {
		if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
			return gm->gm_pfs[i].service;
	}
	return 0;
}

EXPORT_SYMBOL(gss_pseudoflavor_to_service);

char *
gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
{
	int i;

	for (i = 0; i < gm->gm_pf_num; i++) {
		if (gm->gm_pfs[i].service == service)
			return gm->gm_pfs[i].auth_domain_name;
	}
	return NULL;
}

EXPORT_SYMBOL(gss_service_to_auth_domain_name);

void
gss_mech_put(struct gss_api_mech * gm)
{
	module_put(gm->gm_owner);
}

EXPORT_SYMBOL(gss_mech_put);

/* The mech could probably be determined from the token instead, but it's just
 * as easy for now to pass it in. */
int
gss_import_sec_context(const void *input_token, size_t bufsize,
		       struct gss_api_mech	*mech,
		       struct gss_ctx		**ctx_id)
{
	if (!(*ctx_id = kmalloc(sizeof(**ctx_id), GFP_KERNEL)))
		return GSS_S_FAILURE;
	memset(*ctx_id, 0, sizeof(**ctx_id));
	(*ctx_id)->mech_type = gss_mech_get(mech);

	return mech->gm_ops
		->gss_import_sec_context(input_token, bufsize, *ctx_id);
}

/* gss_get_mic: compute a mic over message and return mic_token. */

u32
gss_get_mic(struct gss_ctx	*context_handle,
	    struct xdr_buf	*message,
	    struct xdr_netobj	*mic_token)
{
	 return context_handle->mech_type->gm_ops
		->gss_get_mic(context_handle,
			      message,
			      mic_token);
}

/* gss_verify_mic: check whether the provided mic_token verifies message. */

u32
gss_verify_mic(struct gss_ctx		*context_handle,
	       struct xdr_buf		*message,
	       struct xdr_netobj	*mic_token)
{
	return context_handle->mech_type->gm_ops
		->gss_verify_mic(context_handle,
				 message,
				 mic_token);
}

u32
gss_wrap(struct gss_ctx	*ctx_id,
	 int		offset,
	 struct xdr_buf	*buf,
	 struct page	**inpages)
{
	return ctx_id->mech_type->gm_ops
		->gss_wrap(ctx_id, offset, buf, inpages);
}

u32
gss_unwrap(struct gss_ctx	*ctx_id,
	   int			offset,
	   struct xdr_buf	*buf)
{
	return ctx_id->mech_type->gm_ops
		->gss_unwrap(ctx_id, offset, buf);
}


/* gss_delete_sec_context: free all resources associated with context_handle.
 * Note this differs from the RFC 2744-specified prototype in that we don't
 * bother returning an output token, since it would never be used anyway. */

u32
gss_delete_sec_context(struct gss_ctx	**context_handle)
{
	dprintk("RPC:      gss_delete_sec_context deleting %p\n",
			*context_handle);

	if (!*context_handle)
		return(GSS_S_NO_CONTEXT);
	if ((*context_handle)->internal_ctx_id != 0)
		(*context_handle)->mech_type->gm_ops
			->gss_delete_sec_context((*context_handle)
							->internal_ctx_id);
	if ((*context_handle)->mech_type)
		gss_mech_put((*context_handle)->mech_type);
	kfree(*context_handle);
	*context_handle=NULL;
	return GSS_S_COMPLETE;
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/net/sunrpc/gss_mech_switch.c
	3	*
	4	* Copyright (c) 2001 The Regents of the University of Michigan.
	5	* All rights reserved.
	6	*
	7	* J. Bruce Fields <bfields@umich.edu>
	8	*
	9	* Redistribution and use in source and binary forms, with or without
	10	* modification, are permitted provided that the following conditions
	11	* are met:
	12	*
	13	* 1. Redistributions of source code must retain the above copyright
	14	* notice, this list of conditions and the following disclaimer.
	15	* 2. Redistributions in binary form must reproduce the above copyright
	16	* notice, this list of conditions and the following disclaimer in the
	17	* documentation and/or other materials provided with the distribution.
	18	* 3. Neither the name of the University nor the names of its
	19	* contributors may be used to endorse or promote products derived
	20	* from this software without specific prior written permission.
	21	*
	22	* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
	23	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	24	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	25	* DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
	26	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
	27	* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
	28	* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
	29	* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
	30	* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
	31	* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
	32	* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	33	*
	34	*/
	35
	36	#include <linux/types.h>
	37	#include <linux/slab.h>
1da177e4 LT	38	#include <linux/module.h>
	39	#include <linux/sunrpc/msg_prot.h>
	40	#include <linux/sunrpc/gss_asn1.h>
	41	#include <linux/sunrpc/auth_gss.h>
	42	#include <linux/sunrpc/svcauth_gss.h>
	43	#include <linux/sunrpc/gss_err.h>
	44	#include <linux/sunrpc/sched.h>
	45	#include <linux/sunrpc/gss_api.h>
	46	#include <linux/sunrpc/clnt.h>
	47
	48	#ifdef RPC_DEBUG
	49	# define RPCDBG_FACILITY RPCDBG_AUTH
	50	#endif
	51
	52	static LIST_HEAD(registered_mechs);
	53	static DEFINE_SPINLOCK(registered_mechs_lock);
	54
	55	static void
	56	gss_mech_free(struct gss_api_mech *gm)
	57	{
	58	struct pf_desc *pf;
	59	int i;
	60
	61	for (i = 0; i < gm->gm_pf_num; i++) {
	62	pf = &gm->gm_pfs[i];
	63	if (pf->auth_domain_name)
	64	kfree(pf->auth_domain_name);
	65	pf->auth_domain_name = NULL;
	66	}
	67	}
	68
	69	static inline char *
	70	make_auth_domain_name(char *name)
	71	{
	72	static char *prefix = "gss/";
	73	char *new;
	74
	75	new = kmalloc(strlen(name) + strlen(prefix) + 1, GFP_KERNEL);
	76	if (new) {
	77	strcpy(new, prefix);
	78	strcat(new, name);
	79	}
	80	return new;
	81	}
	82
	83	static int
	84	gss_mech_svc_setup(struct gss_api_mech *gm)
	85	{
	86	struct pf_desc *pf;
	87	int i, status;
	88
	89	for (i = 0; i < gm->gm_pf_num; i++) {
	90	pf = &gm->gm_pfs[i];
	91	pf->auth_domain_name = make_auth_domain_name(pf->name);
	92	status = -ENOMEM;
	93	if (pf->auth_domain_name == NULL)
	94	goto out;
	95	status = svcauth_gss_register_pseudoflavor(pf->pseudoflavor,
	96	pf->auth_domain_name);
	97	if (status)
	98	goto out;
	99	}
	100	return 0;
	101	out:
102	gss_mech_free(gm);
103	return status;
104	}
105
106	int
107	gss_mech_register(struct gss_api_mech *gm)
108	{
109	int status;
110
111	status = gss_mech_svc_setup(gm);
112	if (status)
113	return status;
114	spin_lock(&registered_mechs_lock);
115	list_add(&gm->gm_list, &registered_mechs);
116	spin_unlock(&registered_mechs_lock);
117	dprintk("RPC: registered gss mechanism %s\n", gm->gm_name);
118	return 0;
119	}
120
121	EXPORT_SYMBOL(gss_mech_register);
122
123	void
124	gss_mech_unregister(struct gss_api_mech *gm)
125	{
126	spin_lock(&registered_mechs_lock);
127	list_del(&gm->gm_list);
128	spin_unlock(&registered_mechs_lock);
129	dprintk("RPC: unregistered gss mechanism %s\n", gm->gm_name);
130	gss_mech_free(gm);
131	}
132
133	EXPORT_SYMBOL(gss_mech_unregister);
134
135	struct gss_api_mech *
136	gss_mech_get(struct gss_api_mech *gm)
137	{
138	__module_get(gm->gm_owner);
139	return gm;
140	}
141
142	EXPORT_SYMBOL(gss_mech_get);
143
144	struct gss_api_mech *
145	gss_mech_get_by_name(const char *name)
146	{
147	struct gss_api_mech pos, gm = NULL;
148
149	spin_lock(&registered_mechs_lock);
150	list_for_each_entry(pos, &registered_mechs, gm_list) {
151	if (0 == strcmp(name, pos->gm_name)) {
152	if (try_module_get(pos->gm_owner))
153	gm = pos;
154	break;
155	}
156	}
157	spin_unlock(&registered_mechs_lock);
158	return gm;
159
160	}
161
162	EXPORT_SYMBOL(gss_mech_get_by_name);
163
164	static inline int
165	mech_supports_pseudoflavor(struct gss_api_mech *gm, u32 pseudoflavor)
166	{
167	int i;
168
169	for (i = 0; i < gm->gm_pf_num; i++) {
170	if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
171	return 1;
172	}
173	return 0;
174	}
175
176	struct gss_api_mech *
177	gss_mech_get_by_pseudoflavor(u32 pseudoflavor)
178	{
179	struct gss_api_mech pos, gm = NULL;
180
181	spin_lock(&registered_mechs_lock);
182	list_for_each_entry(pos, &registered_mechs, gm_list) {
183	if (!mech_supports_pseudoflavor(pos, pseudoflavor)) {
184	module_put(pos->gm_owner);
185	continue;
186	}
187	if (try_module_get(pos->gm_owner))
188	gm = pos;
189	break;
190	}
191	spin_unlock(&registered_mechs_lock);
192	return gm;
193	}
194
195	EXPORT_SYMBOL(gss_mech_get_by_pseudoflavor);
196
197	u32
198	gss_pseudoflavor_to_service(struct gss_api_mech *gm, u32 pseudoflavor)
199	{
200	int i;
201
202	for (i = 0; i < gm->gm_pf_num; i++) {
203	if (gm->gm_pfs[i].pseudoflavor == pseudoflavor)
204	return gm->gm_pfs[i].service;
205	}
206	return 0;
207	}
208
209	EXPORT_SYMBOL(gss_pseudoflavor_to_service);
210
211	char *
212	gss_service_to_auth_domain_name(struct gss_api_mech *gm, u32 service)
213	{
214	int i;
215
216	for (i = 0; i < gm->gm_pf_num; i++) {
217	if (gm->gm_pfs[i].service == service)
218	return gm->gm_pfs[i].auth_domain_name;
219	}
220	return NULL;
221	}
222
223	EXPORT_SYMBOL(gss_service_to_auth_domain_name);
224
225	void
226	gss_mech_put(struct gss_api_mech * gm)
227	{
228	module_put(gm->gm_owner);
229	}
230
231	EXPORT_SYMBOL(gss_mech_put);
232
233	/* The mech could probably be determined from the token instead, but it's just
234	* as easy for now to pass it in. */
235	int
236	gss_import_sec_context(const void *input_token, size_t bufsize,
237	struct gss_api_mech *mech,
238	struct gss_ctx **ctx_id)
239	{
240	if (!(ctx_id = kmalloc(sizeof(*ctx_id), GFP_KERNEL)))
241	return GSS_S_FAILURE;
242	memset(ctx_id, 0, sizeof(*ctx_id));
243	(*ctx_id)->mech_type = gss_mech_get(mech);
244
245	return mech->gm_ops
246	->gss_import_sec_context(input_token, bufsize, *ctx_id);
247	}
248
249	/* gss_get_mic: compute a mic over message and return mic_token. */
250
251	u32
252	gss_get_mic(struct gss_ctx *context_handle,
1da177e4 LT	253	struct xdr_buf *message,
	254	struct xdr_netobj *mic_token)
	255	{
	256	return context_handle->mech_type->gm_ops
	257	->gss_get_mic(context_handle,
1da177e4 LT	258	message,
	259	mic_token);
	260	}
	261
	262	/* gss_verify_mic: check whether the provided mic_token verifies message. */
	263
	264	u32
	265	gss_verify_mic(struct gss_ctx *context_handle,
	266	struct xdr_buf *message,
00fd6e14	267	struct xdr_netobj *mic_token)
1da177e4 LT	268	{
	269	return context_handle->mech_type->gm_ops
	270	->gss_verify_mic(context_handle,
	271	message,
00fd6e14	272	mic_token);
1da177e4 LT	273	}
1da177e4 LT	274
293f1eb5 BF	275	u32
293f1eb5 BF	276	gss_wrap(struct gss_ctx *ctx_id,
293f1eb5 BF	277	int offset,
	278	struct xdr_buf *buf,
	279	struct page **inpages)
	280	{
	281	return ctx_id->mech_type->gm_ops
00fd6e14	282	->gss_wrap(ctx_id, offset, buf, inpages);
293f1eb5 BF	283	}
	284
	285	u32
	286	gss_unwrap(struct gss_ctx *ctx_id,
293f1eb5 BF	287	int offset,
	288	struct xdr_buf *buf)
	289	{
	290	return ctx_id->mech_type->gm_ops
00fd6e14	291	->gss_unwrap(ctx_id, offset, buf);
293f1eb5 BF	292	}
	293
	294
1da177e4 LT	295	/* gss_delete_sec_context: free all resources associated with context_handle.
	296	* Note this differs from the RFC 2744-specified prototype in that we don't
	297	* bother returning an output token, since it would never be used anyway. */
	298
	299	u32
	300	gss_delete_sec_context(struct gss_ctx **context_handle)
	301	{
	302	dprintk("RPC: gss_delete_sec_context deleting %p\n",
	303	*context_handle);
	304
	305	if (!*context_handle)
	306	return(GSS_S_NO_CONTEXT);
	307	if ((*context_handle)->internal_ctx_id != 0)
	308	(*context_handle)->mech_type->gm_ops
	309	->gss_delete_sec_context((*context_handle)
	310	->internal_ctx_id);
	311	if ((*context_handle)->mech_type)
	312	gss_mech_put((*context_handle)->mech_type);
	313	kfree(*context_handle);
	314	*context_handle=NULL;
	315	return GSS_S_COMPLETE;
	316	}