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