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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(®istered_mechs_lock); | |
115 | list_add(&gm->gm_list, ®istered_mechs); | |
116 | spin_unlock(®istered_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(®istered_mechs_lock); | |
127 | list_del(&gm->gm_list); | |
128 | spin_unlock(®istered_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(®istered_mechs_lock); | |
150 | list_for_each_entry(pos, ®istered_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(®istered_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(®istered_mechs_lock); | |
182 | list_for_each_entry(pos, ®istered_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(®istered_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, | |
253 | u32 qop, | |
254 | struct xdr_buf *message, | |
255 | struct xdr_netobj *mic_token) | |
256 | { | |
257 | return context_handle->mech_type->gm_ops | |
258 | ->gss_get_mic(context_handle, | |
259 | qop, | |
260 | message, | |
261 | mic_token); | |
262 | } | |
263 | ||
264 | /* gss_verify_mic: check whether the provided mic_token verifies message. */ | |
265 | ||
266 | u32 | |
267 | gss_verify_mic(struct gss_ctx *context_handle, | |
268 | struct xdr_buf *message, | |
269 | struct xdr_netobj *mic_token, | |
270 | u32 *qstate) | |
271 | { | |
272 | return context_handle->mech_type->gm_ops | |
273 | ->gss_verify_mic(context_handle, | |
274 | message, | |
275 | mic_token, | |
276 | qstate); | |
277 | } | |
278 | ||
279 | /* gss_delete_sec_context: free all resources associated with context_handle. | |
280 | * Note this differs from the RFC 2744-specified prototype in that we don't | |
281 | * bother returning an output token, since it would never be used anyway. */ | |
282 | ||
283 | u32 | |
284 | gss_delete_sec_context(struct gss_ctx **context_handle) | |
285 | { | |
286 | dprintk("RPC: gss_delete_sec_context deleting %p\n", | |
287 | *context_handle); | |
288 | ||
289 | if (!*context_handle) | |
290 | return(GSS_S_NO_CONTEXT); | |
291 | if ((*context_handle)->internal_ctx_id != 0) | |
292 | (*context_handle)->mech_type->gm_ops | |
293 | ->gss_delete_sec_context((*context_handle) | |
294 | ->internal_ctx_id); | |
295 | if ((*context_handle)->mech_type) | |
296 | gss_mech_put((*context_handle)->mech_type); | |
297 | kfree(*context_handle); | |
298 | *context_handle=NULL; | |
299 | return GSS_S_COMPLETE; | |
300 | } |