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 /* 86 * EntityName, not to be confused with entity_name_t 87 */ 88 int ceph_auth_entity_name_encode(const char *name, void **p, void *end) 89 { 90 int len = strlen(name); 91 92 if (*p + 2*sizeof(u32) + len > end) 93 return -ERANGE; 94 ceph_encode_32(p, CEPH_ENTITY_TYPE_CLIENT); 95 ceph_encode_32(p, len); 96 ceph_encode_copy(p, name, len); 97 return 0; 98 } 99 100 /* 101 * Initiate protocol negotiation with monitor. Include entity name 102 * and list supported protocols. 103 */ 104 int ceph_auth_build_hello(struct ceph_auth_client *ac, void *buf, size_t len) 105 { 106 struct ceph_mon_request_header *monhdr = buf; 107 void *p = monhdr + 1, *end = buf + len, *lenp; 108 int i, num; 109 int ret; 110 111 mutex_lock(&ac->mutex); 112 dout("auth_build_hello\n"); 113 monhdr->have_version = 0; 114 monhdr->session_mon = cpu_to_le16(-1); 115 monhdr->session_mon_tid = 0; 116 117 ceph_encode_32(&p, CEPH_AUTH_UNKNOWN); /* no protocol, yet */ 118 119 lenp = p; 120 p += sizeof(u32); 121 122 ceph_decode_need(&p, end, 1 + sizeof(u32), bad); 123 ceph_encode_8(&p, 1); 124 num = ARRAY_SIZE(supported_protocols); 125 ceph_encode_32(&p, num); 126 ceph_decode_need(&p, end, num * sizeof(u32), bad); 127 for (i = 0; i < num; i++) 128 ceph_encode_32(&p, supported_protocols[i]); 129 130 ret = ceph_auth_entity_name_encode(ac->name, &p, end); 131 if (ret < 0) 132 goto out; 133 ceph_decode_need(&p, end, sizeof(u64), bad); 134 ceph_encode_64(&p, ac->global_id); 135 136 ceph_encode_32(&lenp, p - lenp - sizeof(u32)); 137 ret = p - buf; 138 out: 139 mutex_unlock(&ac->mutex); 140 return ret; 141 142 bad: 143 ret = -ERANGE; 144 goto out; 145 } 146 147 static int ceph_build_auth_request(struct ceph_auth_client *ac, 148 void *msg_buf, size_t msg_len) 149 { 150 struct ceph_mon_request_header *monhdr = msg_buf; 151 void *p = monhdr + 1; 152 void *end = msg_buf + msg_len; 153 int ret; 154 155 monhdr->have_version = 0; 156 monhdr->session_mon = cpu_to_le16(-1); 157 monhdr->session_mon_tid = 0; 158 159 ceph_encode_32(&p, ac->protocol); 160 161 ret = ac->ops->build_request(ac, p + sizeof(u32), end); 162 if (ret < 0) { 163 pr_err("error %d building auth method %s request\n", ret, 164 ac->ops->name); 165 goto out; 166 } 167 dout(" built request %d bytes\n", ret); 168 ceph_encode_32(&p, ret); 169 ret = p + ret - msg_buf; 170 out: 171 return ret; 172 } 173 174 /* 175 * Handle auth message from monitor. 176 */ 177 int ceph_handle_auth_reply(struct ceph_auth_client *ac, 178 void *buf, size_t len, 179 void *reply_buf, size_t reply_len) 180 { 181 void *p = buf; 182 void *end = buf + len; 183 int protocol; 184 s32 result; 185 u64 global_id; 186 void *payload, *payload_end; 187 int payload_len; 188 char *result_msg; 189 int result_msg_len; 190 int ret = -EINVAL; 191 192 mutex_lock(&ac->mutex); 193 dout("handle_auth_reply %p %p\n", p, end); 194 ceph_decode_need(&p, end, sizeof(u32) * 3 + sizeof(u64), bad); 195 protocol = ceph_decode_32(&p); 196 result = ceph_decode_32(&p); 197 global_id = ceph_decode_64(&p); 198 payload_len = ceph_decode_32(&p); 199 payload = p; 200 p += payload_len; 201 ceph_decode_need(&p, end, sizeof(u32), bad); 202 result_msg_len = ceph_decode_32(&p); 203 result_msg = p; 204 p += result_msg_len; 205 if (p != end) 206 goto bad; 207 208 dout(" result %d '%.*s' gid %llu len %d\n", result, result_msg_len, 209 result_msg, global_id, payload_len); 210 211 payload_end = payload + payload_len; 212 213 if (global_id && ac->global_id != global_id) { 214 dout(" set global_id %lld -> %lld\n", ac->global_id, global_id); 215 ac->global_id = global_id; 216 } 217 218 if (ac->negotiating) { 219 /* server does not support our protocols? */ 220 if (!protocol && result < 0) { 221 ret = result; 222 goto out; 223 } 224 /* set up (new) protocol handler? */ 225 if (ac->protocol && ac->protocol != protocol) { 226 ac->ops->destroy(ac); 227 ac->protocol = 0; 228 ac->ops = NULL; 229 } 230 if (ac->protocol != protocol) { 231 ret = ceph_auth_init_protocol(ac, protocol); 232 if (ret) { 233 pr_err("error %d on auth protocol %d init\n", 234 ret, protocol); 235 goto out; 236 } 237 } 238 239 ac->negotiating = false; 240 } 241 242 ret = ac->ops->handle_reply(ac, result, payload, payload_end); 243 if (ret == -EAGAIN) { 244 ret = ceph_build_auth_request(ac, reply_buf, reply_len); 245 } else if (ret) { 246 pr_err("auth method '%s' error %d\n", ac->ops->name, ret); 247 } 248 249 out: 250 mutex_unlock(&ac->mutex); 251 return ret; 252 253 bad: 254 pr_err("failed to decode auth msg\n"); 255 ret = -EINVAL; 256 goto out; 257 } 258 259 int ceph_build_auth(struct ceph_auth_client *ac, 260 void *msg_buf, size_t msg_len) 261 { 262 int ret = 0; 263 264 mutex_lock(&ac->mutex); 265 if (ac->ops->should_authenticate(ac)) 266 ret = ceph_build_auth_request(ac, msg_buf, msg_len); 267 mutex_unlock(&ac->mutex); 268 return ret; 269 } 270 271 int ceph_auth_is_authenticated(struct ceph_auth_client *ac) 272 { 273 int ret = 0; 274 275 mutex_lock(&ac->mutex); 276 if (ac->ops) 277 ret = ac->ops->is_authenticated(ac); 278 mutex_unlock(&ac->mutex); 279 return ret; 280 } 281 EXPORT_SYMBOL(ceph_auth_is_authenticated); 282 283 int ceph_auth_create_authorizer(struct ceph_auth_client *ac, 284 int peer_type, 285 struct ceph_auth_handshake *auth) 286 { 287 int ret = 0; 288 289 mutex_lock(&ac->mutex); 290 if (ac->ops && ac->ops->create_authorizer) 291 ret = ac->ops->create_authorizer(ac, peer_type, auth); 292 mutex_unlock(&ac->mutex); 293 return ret; 294 } 295 EXPORT_SYMBOL(ceph_auth_create_authorizer); 296 297 void ceph_auth_destroy_authorizer(struct ceph_authorizer *a) 298 { 299 a->destroy(a); 300 } 301 EXPORT_SYMBOL(ceph_auth_destroy_authorizer); 302 303 int ceph_auth_update_authorizer(struct ceph_auth_client *ac, 304 int peer_type, 305 struct ceph_auth_handshake *a) 306 { 307 int ret = 0; 308 309 mutex_lock(&ac->mutex); 310 if (ac->ops && ac->ops->update_authorizer) 311 ret = ac->ops->update_authorizer(ac, peer_type, a); 312 mutex_unlock(&ac->mutex); 313 return ret; 314 } 315 EXPORT_SYMBOL(ceph_auth_update_authorizer); 316 317 int ceph_auth_verify_authorizer_reply(struct ceph_auth_client *ac, 318 struct ceph_authorizer *a) 319 { 320 int ret = 0; 321 322 mutex_lock(&ac->mutex); 323 if (ac->ops && ac->ops->verify_authorizer_reply) 324 ret = ac->ops->verify_authorizer_reply(ac, a); 325 mutex_unlock(&ac->mutex); 326 return ret; 327 } 328 EXPORT_SYMBOL(ceph_auth_verify_authorizer_reply); 329 330 void ceph_auth_invalidate_authorizer(struct ceph_auth_client *ac, int peer_type) 331 { 332 mutex_lock(&ac->mutex); 333 if (ac->ops && ac->ops->invalidate_authorizer) 334 ac->ops->invalidate_authorizer(ac, peer_type); 335 mutex_unlock(&ac->mutex); 336 } 337 EXPORT_SYMBOL(ceph_auth_invalidate_authorizer); 338