1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/ceph/ceph_debug.h>
3
4 #include <linux/module.h>
5 #include <linux/err.h>
6 #include <linux/slab.h>
7
8 #include <linux/ceph/types.h>
9 #include <linux/ceph/decode.h>
10 #include <linux/ceph/libceph.h>
11 #include <linux/ceph/messenger.h>
12 #include "auth_none.h"
13 #include "auth_x.h"
14
15
16 /*
17 * get protocol handler
18 */
19 static u32 supported_protocols[] = {
20 CEPH_AUTH_NONE,
21 CEPH_AUTH_CEPHX
22 };
23
ceph_auth_init_protocol(struct ceph_auth_client * ac,int protocol)24 static int ceph_auth_init_protocol(struct ceph_auth_client *ac, int protocol)
25 {
26 switch (protocol) {
27 case CEPH_AUTH_NONE:
28 return ceph_auth_none_init(ac);
29 case CEPH_AUTH_CEPHX:
30 return ceph_x_init(ac);
31 default:
32 return -ENOENT;
33 }
34 }
35
36 /*
37 * setup, teardown.
38 */
ceph_auth_init(const char * name,const struct ceph_crypto_key * key)39 struct ceph_auth_client *ceph_auth_init(const char *name, const struct ceph_crypto_key *key)
40 {
41 struct ceph_auth_client *ac;
42 int ret;
43
44 dout("auth_init name '%s'\n", name);
45
46 ret = -ENOMEM;
47 ac = kzalloc(sizeof(*ac), GFP_NOFS);
48 if (!ac)
49 goto out;
50
51 mutex_init(&ac->mutex);
52 ac->negotiating = true;
53 if (name)
54 ac->name = name;
55 else
56 ac->name = CEPH_AUTH_NAME_DEFAULT;
57 dout("auth_init name %s\n", ac->name);
58 ac->key = key;
59 return ac;
60
61 out:
62 return ERR_PTR(ret);
63 }
64
ceph_auth_destroy(struct ceph_auth_client * ac)65 void ceph_auth_destroy(struct ceph_auth_client *ac)
66 {
67 dout("auth_destroy %p\n", ac);
68 if (ac->ops)
69 ac->ops->destroy(ac);
70 kfree(ac);
71 }
72
73 /*
74 * Reset occurs when reconnecting to the monitor.
75 */
ceph_auth_reset(struct ceph_auth_client * ac)76 void ceph_auth_reset(struct ceph_auth_client *ac)
77 {
78 mutex_lock(&ac->mutex);
79 dout("auth_reset %p\n", ac);
80 if (ac->ops && !ac->negotiating)
81 ac->ops->reset(ac);
82 ac->negotiating = true;
83 mutex_unlock(&ac->mutex);
84 }
85
86 /*
87 * EntityName, not to be confused with entity_name_t
88 */
ceph_auth_entity_name_encode(const char * name,void ** p,void * end)89 int ceph_auth_entity_name_encode(const char *name, void **p, void *end)
90 {
91 int len = strlen(name);
92
93 if (*p + 2*sizeof(u32) + len > end)
94 return -ERANGE;
95 ceph_encode_32(p, CEPH_ENTITY_TYPE_CLIENT);
96 ceph_encode_32(p, len);
97 ceph_encode_copy(p, name, len);
98 return 0;
99 }
100
101 /*
102 * Initiate protocol negotiation with monitor. Include entity name
103 * and list supported protocols.
104 */
ceph_auth_build_hello(struct ceph_auth_client * ac,void * buf,size_t len)105 int ceph_auth_build_hello(struct ceph_auth_client *ac, void *buf, size_t len)
106 {
107 struct ceph_mon_request_header *monhdr = buf;
108 void *p = monhdr + 1, *end = buf + len, *lenp;
109 int i, num;
110 int ret;
111
112 mutex_lock(&ac->mutex);
113 dout("auth_build_hello\n");
114 monhdr->have_version = 0;
115 monhdr->session_mon = cpu_to_le16(-1);
116 monhdr->session_mon_tid = 0;
117
118 ceph_encode_32(&p, CEPH_AUTH_UNKNOWN); /* no protocol, yet */
119
120 lenp = p;
121 p += sizeof(u32);
122
123 ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
124 ceph_encode_8(&p, 1);
125 num = ARRAY_SIZE(supported_protocols);
126 ceph_encode_32(&p, num);
127 ceph_decode_need(&p, end, num * sizeof(u32), bad);
128 for (i = 0; i < num; i++)
129 ceph_encode_32(&p, supported_protocols[i]);
130
131 ret = ceph_auth_entity_name_encode(ac->name, &p, end);
132 if (ret < 0)
133 goto out;
134 ceph_decode_need(&p, end, sizeof(u64), bad);
135 ceph_encode_64(&p, ac->global_id);
136
137 ceph_encode_32(&lenp, p - lenp - sizeof(u32));
138 ret = p - buf;
139 out:
140 mutex_unlock(&ac->mutex);
141 return ret;
142
143 bad:
144 ret = -ERANGE;
145 goto out;
146 }
147
ceph_build_auth_request(struct ceph_auth_client * ac,void * msg_buf,size_t msg_len)148 static int ceph_build_auth_request(struct ceph_auth_client *ac,
149 void *msg_buf, size_t msg_len)
150 {
151 struct ceph_mon_request_header *monhdr = msg_buf;
152 void *p = monhdr + 1;
153 void *end = msg_buf + msg_len;
154 int ret;
155
156 monhdr->have_version = 0;
157 monhdr->session_mon = cpu_to_le16(-1);
158 monhdr->session_mon_tid = 0;
159
160 ceph_encode_32(&p, ac->protocol);
161
162 ret = ac->ops->build_request(ac, p + sizeof(u32), end);
163 if (ret < 0) {
164 pr_err("error %d building auth method %s request\n", ret,
165 ac->ops->name);
166 goto out;
167 }
168 dout(" built request %d bytes\n", ret);
169 ceph_encode_32(&p, ret);
170 ret = p + ret - msg_buf;
171 out:
172 return ret;
173 }
174
175 /*
176 * Handle auth message from monitor.
177 */
ceph_handle_auth_reply(struct ceph_auth_client * ac,void * buf,size_t len,void * reply_buf,size_t reply_len)178 int ceph_handle_auth_reply(struct ceph_auth_client *ac,
179 void *buf, size_t len,
180 void *reply_buf, size_t reply_len)
181 {
182 void *p = buf;
183 void *end = buf + len;
184 int protocol;
185 s32 result;
186 u64 global_id;
187 void *payload, *payload_end;
188 int payload_len;
189 char *result_msg;
190 int result_msg_len;
191 int ret = -EINVAL;
192
193 mutex_lock(&ac->mutex);
194 dout("handle_auth_reply %p %p\n", p, end);
195 ceph_decode_need(&p, end, sizeof(u32) * 3 + sizeof(u64), bad);
196 protocol = ceph_decode_32(&p);
197 result = ceph_decode_32(&p);
198 global_id = ceph_decode_64(&p);
199 payload_len = ceph_decode_32(&p);
200 payload = p;
201 p += payload_len;
202 ceph_decode_need(&p, end, sizeof(u32), bad);
203 result_msg_len = ceph_decode_32(&p);
204 result_msg = p;
205 p += result_msg_len;
206 if (p != end)
207 goto bad;
208
209 dout(" result %d '%.*s' gid %llu len %d\n", result, result_msg_len,
210 result_msg, global_id, payload_len);
211
212 payload_end = payload + payload_len;
213
214 if (global_id && ac->global_id != global_id) {
215 dout(" set global_id %lld -> %lld\n", ac->global_id, global_id);
216 ac->global_id = global_id;
217 }
218
219 if (ac->negotiating) {
220 /* server does not support our protocols? */
221 if (!protocol && result < 0) {
222 ret = result;
223 goto out;
224 }
225 /* set up (new) protocol handler? */
226 if (ac->protocol && ac->protocol != protocol) {
227 ac->ops->destroy(ac);
228 ac->protocol = 0;
229 ac->ops = NULL;
230 }
231 if (ac->protocol != protocol) {
232 ret = ceph_auth_init_protocol(ac, protocol);
233 if (ret) {
234 pr_err("error %d on auth protocol %d init\n",
235 ret, protocol);
236 goto out;
237 }
238 }
239
240 ac->negotiating = false;
241 }
242
243 ret = ac->ops->handle_reply(ac, result, payload, payload_end);
244 if (ret == -EAGAIN) {
245 ret = ceph_build_auth_request(ac, reply_buf, reply_len);
246 } else if (ret) {
247 pr_err("auth method '%s' error %d\n", ac->ops->name, ret);
248 }
249
250 out:
251 mutex_unlock(&ac->mutex);
252 return ret;
253
254 bad:
255 pr_err("failed to decode auth msg\n");
256 ret = -EINVAL;
257 goto out;
258 }
259
ceph_build_auth(struct ceph_auth_client * ac,void * msg_buf,size_t msg_len)260 int ceph_build_auth(struct ceph_auth_client *ac,
261 void *msg_buf, size_t msg_len)
262 {
263 int ret = 0;
264
265 mutex_lock(&ac->mutex);
266 if (ac->ops->should_authenticate(ac))
267 ret = ceph_build_auth_request(ac, msg_buf, msg_len);
268 mutex_unlock(&ac->mutex);
269 return ret;
270 }
271
ceph_auth_is_authenticated(struct ceph_auth_client * ac)272 int ceph_auth_is_authenticated(struct ceph_auth_client *ac)
273 {
274 int ret = 0;
275
276 mutex_lock(&ac->mutex);
277 if (ac->ops)
278 ret = ac->ops->is_authenticated(ac);
279 mutex_unlock(&ac->mutex);
280 return ret;
281 }
282 EXPORT_SYMBOL(ceph_auth_is_authenticated);
283
ceph_auth_create_authorizer(struct ceph_auth_client * ac,int peer_type,struct ceph_auth_handshake * auth)284 int ceph_auth_create_authorizer(struct ceph_auth_client *ac,
285 int peer_type,
286 struct ceph_auth_handshake *auth)
287 {
288 int ret = 0;
289
290 mutex_lock(&ac->mutex);
291 if (ac->ops && ac->ops->create_authorizer)
292 ret = ac->ops->create_authorizer(ac, peer_type, auth);
293 mutex_unlock(&ac->mutex);
294 return ret;
295 }
296 EXPORT_SYMBOL(ceph_auth_create_authorizer);
297
ceph_auth_destroy_authorizer(struct ceph_authorizer * a)298 void ceph_auth_destroy_authorizer(struct ceph_authorizer *a)
299 {
300 a->destroy(a);
301 }
302 EXPORT_SYMBOL(ceph_auth_destroy_authorizer);
303
ceph_auth_update_authorizer(struct ceph_auth_client * ac,int peer_type,struct ceph_auth_handshake * a)304 int ceph_auth_update_authorizer(struct ceph_auth_client *ac,
305 int peer_type,
306 struct ceph_auth_handshake *a)
307 {
308 int ret = 0;
309
310 mutex_lock(&ac->mutex);
311 if (ac->ops && ac->ops->update_authorizer)
312 ret = ac->ops->update_authorizer(ac, peer_type, a);
313 mutex_unlock(&ac->mutex);
314 return ret;
315 }
316 EXPORT_SYMBOL(ceph_auth_update_authorizer);
317
ceph_auth_add_authorizer_challenge(struct ceph_auth_client * ac,struct ceph_authorizer * a,void * challenge_buf,int challenge_buf_len)318 int ceph_auth_add_authorizer_challenge(struct ceph_auth_client *ac,
319 struct ceph_authorizer *a,
320 void *challenge_buf,
321 int challenge_buf_len)
322 {
323 int ret = 0;
324
325 mutex_lock(&ac->mutex);
326 if (ac->ops && ac->ops->add_authorizer_challenge)
327 ret = ac->ops->add_authorizer_challenge(ac, a, challenge_buf,
328 challenge_buf_len);
329 mutex_unlock(&ac->mutex);
330 return ret;
331 }
332 EXPORT_SYMBOL(ceph_auth_add_authorizer_challenge);
333
ceph_auth_verify_authorizer_reply(struct ceph_auth_client * ac,struct ceph_authorizer * a)334 int ceph_auth_verify_authorizer_reply(struct ceph_auth_client *ac,
335 struct ceph_authorizer *a)
336 {
337 int ret = 0;
338
339 mutex_lock(&ac->mutex);
340 if (ac->ops && ac->ops->verify_authorizer_reply)
341 ret = ac->ops->verify_authorizer_reply(ac, a);
342 mutex_unlock(&ac->mutex);
343 return ret;
344 }
345 EXPORT_SYMBOL(ceph_auth_verify_authorizer_reply);
346
ceph_auth_invalidate_authorizer(struct ceph_auth_client * ac,int peer_type)347 void ceph_auth_invalidate_authorizer(struct ceph_auth_client *ac, int peer_type)
348 {
349 mutex_lock(&ac->mutex);
350 if (ac->ops && ac->ops->invalidate_authorizer)
351 ac->ops->invalidate_authorizer(ac, peer_type);
352 mutex_unlock(&ac->mutex);
353 }
354 EXPORT_SYMBOL(ceph_auth_invalidate_authorizer);
355
