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Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07001#include <linux/ceph/ceph_debug.h>
Sage Weil4e7a5dc2009-11-18 16:19:57 -08002
3#include <linux/module.h>
4#include <linux/err.h>
Sage Weild45d0d92010-04-20 15:20:33 -07005#include <linux/slab.h>
Sage Weil4e7a5dc2009-11-18 16:19:57 -08006
Yehuda Sadeh3d14c5d2010-04-06 15:14:15 -07007#include <linux/ceph/types.h>
8#include <linux/ceph/decode.h>
9#include <linux/ceph/libceph.h>
10#include <linux/ceph/messenger.h>
Sage Weil4e7a5dc2009-11-18 16:19:57 -080011#include "auth_none.h"
Sage Weilec0994e2010-02-02 16:25:35 -080012#include "auth_x.h"
Sage Weil4e7a5dc2009-11-18 16:19:57 -080013
Sage Weil4e7a5dc2009-11-18 16:19:57 -080014
15/*
16 * get protocol handler
17 */
18static u32 supported_protocols[] = {
Sage Weilec0994e2010-02-02 16:25:35 -080019 CEPH_AUTH_NONE,
20 CEPH_AUTH_CEPHX
Sage Weil4e7a5dc2009-11-18 16:19:57 -080021};
22
Yehuda Sadehcd84db62010-06-11 16:58:48 -070023static int ceph_auth_init_protocol(struct ceph_auth_client *ac, int protocol)
Sage Weil4e7a5dc2009-11-18 16:19:57 -080024{
25 switch (protocol) {
26 case CEPH_AUTH_NONE:
27 return ceph_auth_none_init(ac);
Sage Weilec0994e2010-02-02 16:25:35 -080028 case CEPH_AUTH_CEPHX:
29 return ceph_x_init(ac);
Sage Weil4e7a5dc2009-11-18 16:19:57 -080030 default:
31 return -ENOENT;
32 }
33}
34
35/*
36 * setup, teardown.
37 */
Tommi Virtanen8323c3a2011-03-25 16:32:57 -070038struct ceph_auth_client *ceph_auth_init(const char *name, const struct ceph_crypto_key *key)
Sage Weil4e7a5dc2009-11-18 16:19:57 -080039{
40 struct ceph_auth_client *ac;
41 int ret;
42
Tommi Virtanen8323c3a2011-03-25 16:32:57 -070043 dout("auth_init name '%s'\n", name);
Sage Weil4e7a5dc2009-11-18 16:19:57 -080044
45 ret = -ENOMEM;
46 ac = kzalloc(sizeof(*ac), GFP_NOFS);
47 if (!ac)
48 goto out;
49
50 ac->negotiating = true;
51 if (name)
52 ac->name = name;
53 else
54 ac->name = CEPH_AUTH_NAME_DEFAULT;
Tommi Virtanen8323c3a2011-03-25 16:32:57 -070055 dout("auth_init name %s\n", ac->name);
56 ac->key = key;
Sage Weil4e7a5dc2009-11-18 16:19:57 -080057 return ac;
58
59out:
60 return ERR_PTR(ret);
61}
62
63void ceph_auth_destroy(struct ceph_auth_client *ac)
64{
65 dout("auth_destroy %p\n", ac);
66 if (ac->ops)
67 ac->ops->destroy(ac);
68 kfree(ac);
69}
70
71/*
72 * Reset occurs when reconnecting to the monitor.
73 */
74void ceph_auth_reset(struct ceph_auth_client *ac)
75{
76 dout("auth_reset %p\n", ac);
77 if (ac->ops && !ac->negotiating)
78 ac->ops->reset(ac);
79 ac->negotiating = true;
80}
81
82int ceph_entity_name_encode(const char *name, void **p, void *end)
83{
84 int len = strlen(name);
85
86 if (*p + 2*sizeof(u32) + len > end)
87 return -ERANGE;
88 ceph_encode_32(p, CEPH_ENTITY_TYPE_CLIENT);
89 ceph_encode_32(p, len);
90 ceph_encode_copy(p, name, len);
91 return 0;
92}
93
94/*
95 * Initiate protocol negotiation with monitor. Include entity name
96 * and list supported protocols.
97 */
98int ceph_auth_build_hello(struct ceph_auth_client *ac, void *buf, size_t len)
99{
100 struct ceph_mon_request_header *monhdr = buf;
101 void *p = monhdr + 1, *end = buf + len, *lenp;
102 int i, num;
103 int ret;
104
105 dout("auth_build_hello\n");
106 monhdr->have_version = 0;
107 monhdr->session_mon = cpu_to_le16(-1);
108 monhdr->session_mon_tid = 0;
109
110 ceph_encode_32(&p, 0); /* no protocol, yet */
111
112 lenp = p;
113 p += sizeof(u32);
114
Sage Weil07c87392010-02-04 09:42:20 -0800115 ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
116 ceph_encode_8(&p, 1);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800117 num = ARRAY_SIZE(supported_protocols);
118 ceph_encode_32(&p, num);
Sage Weil07c87392010-02-04 09:42:20 -0800119 ceph_decode_need(&p, end, num * sizeof(u32), bad);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800120 for (i = 0; i < num; i++)
121 ceph_encode_32(&p, supported_protocols[i]);
122
123 ret = ceph_entity_name_encode(ac->name, &p, end);
124 if (ret < 0)
125 return ret;
126 ceph_decode_need(&p, end, sizeof(u64), bad);
127 ceph_encode_64(&p, ac->global_id);
128
129 ceph_encode_32(&lenp, p - lenp - sizeof(u32));
130 return p - buf;
131
132bad:
133 return -ERANGE;
134}
135
Yehuda Sadehcd84db62010-06-11 16:58:48 -0700136static int ceph_build_auth_request(struct ceph_auth_client *ac,
137 void *msg_buf, size_t msg_len)
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800138{
139 struct ceph_mon_request_header *monhdr = msg_buf;
140 void *p = monhdr + 1;
141 void *end = msg_buf + msg_len;
142 int ret;
143
144 monhdr->have_version = 0;
145 monhdr->session_mon = cpu_to_le16(-1);
146 monhdr->session_mon_tid = 0;
147
148 ceph_encode_32(&p, ac->protocol);
149
150 ret = ac->ops->build_request(ac, p + sizeof(u32), end);
151 if (ret < 0) {
Sage Weil559c1e02010-05-14 09:55:18 -0700152 pr_err("error %d building auth method %s request\n", ret,
153 ac->ops->name);
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800154 return ret;
155 }
156 dout(" built request %d bytes\n", ret);
157 ceph_encode_32(&p, ret);
158 return p + ret - msg_buf;
159}
160
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800161/*
162 * Handle auth message from monitor.
163 */
164int ceph_handle_auth_reply(struct ceph_auth_client *ac,
165 void *buf, size_t len,
166 void *reply_buf, size_t reply_len)
167{
168 void *p = buf;
169 void *end = buf + len;
170 int protocol;
171 s32 result;
172 u64 global_id;
173 void *payload, *payload_end;
174 int payload_len;
175 char *result_msg;
176 int result_msg_len;
177 int ret = -EINVAL;
178
179 dout("handle_auth_reply %p %p\n", p, end);
180 ceph_decode_need(&p, end, sizeof(u32) * 3 + sizeof(u64), bad);
181 protocol = ceph_decode_32(&p);
182 result = ceph_decode_32(&p);
183 global_id = ceph_decode_64(&p);
184 payload_len = ceph_decode_32(&p);
185 payload = p;
186 p += payload_len;
187 ceph_decode_need(&p, end, sizeof(u32), bad);
188 result_msg_len = ceph_decode_32(&p);
189 result_msg = p;
190 p += result_msg_len;
191 if (p != end)
192 goto bad;
193
194 dout(" result %d '%.*s' gid %llu len %d\n", result, result_msg_len,
195 result_msg, global_id, payload_len);
196
197 payload_end = payload + payload_len;
198
199 if (global_id && ac->global_id != global_id) {
200 dout(" set global_id %lld -> %lld\n", ac->global_id, global_id);
201 ac->global_id = global_id;
202 }
203
204 if (ac->negotiating) {
Yehuda Sadehdc146572009-11-20 13:59:13 -0800205 /* server does not support our protocols? */
206 if (!protocol && result < 0) {
207 ret = result;
208 goto out;
209 }
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800210 /* set up (new) protocol handler? */
211 if (ac->protocol && ac->protocol != protocol) {
212 ac->ops->destroy(ac);
213 ac->protocol = 0;
214 ac->ops = NULL;
215 }
216 if (ac->protocol != protocol) {
217 ret = ceph_auth_init_protocol(ac, protocol);
218 if (ret) {
Sage Weile95e9a72010-05-25 09:24:42 -0700219 pr_err("error %d on auth protocol %d init\n",
220 ret, protocol);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800221 goto out;
222 }
223 }
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800224
225 ac->negotiating = false;
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800226 }
227
228 ret = ac->ops->handle_reply(ac, result, payload, payload_end);
229 if (ret == -EAGAIN) {
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800230 return ceph_build_auth_request(ac, reply_buf, reply_len);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800231 } else if (ret) {
Sage Weil559c1e02010-05-14 09:55:18 -0700232 pr_err("auth method '%s' error %d\n", ac->ops->name, ret);
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800233 return ret;
234 }
235 return 0;
236
237bad:
238 pr_err("failed to decode auth msg\n");
239out:
240 return ret;
241}
242
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800243int ceph_build_auth(struct ceph_auth_client *ac,
244 void *msg_buf, size_t msg_len)
245{
246 if (!ac->protocol)
247 return ceph_auth_build_hello(ac, msg_buf, msg_len);
248 BUG_ON(!ac->ops);
Sage Weila41359f2010-05-25 15:39:06 -0700249 if (ac->ops->should_authenticate(ac))
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800250 return ceph_build_auth_request(ac, msg_buf, msg_len);
251 return 0;
252}
Sage Weil4e7a5dc2009-11-18 16:19:57 -0800253
Sage Weil9bd2e6f2010-02-02 16:21:06 -0800254int ceph_auth_is_authenticated(struct ceph_auth_client *ac)
255{
256 if (!ac->ops)
257 return 0;
258 return ac->ops->is_authenticated(ac);
259}