summaryrefslogtreecommitdiff
path: root/net/sunrpc/auth_gss/gss_mech_switch.c
blob: 76e4c6f4ac3c1ad8f58f1f7a92bf7781d05b18a3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
/*
 *  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];
		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_GPL(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_GPL(gss_mech_unregister);

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

EXPORT_SYMBOL_GPL(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_GPL(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_GPL(gss_mech_get_by_pseudoflavor);

u32
gss_svc_to_pseudoflavor(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].pseudoflavor;
		}
	}
	return RPC_AUTH_MAXFLAVOR; /* illegal value */
}
EXPORT_SYMBOL_GPL(gss_svc_to_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_GPL(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_GPL(gss_service_to_auth_domain_name);

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

EXPORT_SYMBOL_GPL(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 = kzalloc(sizeof(**ctx_id), GFP_KERNEL)))
		return -ENOMEM;
	(*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)
		(*context_handle)->mech_type->gm_ops
			->gss_delete_sec_context((*context_handle)
							->internal_ctx_id);
	gss_mech_put((*context_handle)->mech_type);
	kfree(*context_handle);
	*context_handle=NULL;
	return GSS_S_COMPLETE;
}