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 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 */ 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 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 */ 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 */ 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 */ 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 } 147 148 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 */ 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 } 259 260 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 } 271 272 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); 283 284 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); 297 298 void ceph_auth_destroy_authorizer(struct ceph_authorizer *a) 299 { 300 a->destroy(a); 301 } 302 EXPORT_SYMBOL(ceph_auth_destroy_authorizer); 303 304 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); 317 318 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); 333 334 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); 346 347 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