fs/ceph/auth.c

   1 #include "ceph_debug.h"
   2
   3 #include <linux/module.h>
   4 #include <linux/err.h>
   5 #include <linux/slab.h>
   6
   7 #include "types.h"
   8 #include "auth_none.h"
   9 #include "auth_x.h"
  10 #include "decode.h"
  11 #include "super.h"
  12
  13 #include "messenger.h"
  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 char *secret)
  39 {
  40         struct ceph_auth_client *ac;
  41         int ret;
  42
  43         dout("auth_init name '%s' secret '%s'\n", name, secret);
  44
  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;
  55         dout("auth_init name %s secret %s\n", ac->name, secret);
  56         ac->secret = secret;
  57         return ac;
  58
  59 out:
  60         return ERR_PTR(ret);
  61 }
  62
  63 void 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  */
  74 void 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
  82 int 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  */
  98 int 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
 115         ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
 116         ceph_encode_8(&p, 1);
 117         num = ARRAY_SIZE(supported_protocols);
 118         ceph_encode_32(&p, num);
 119         ceph_decode_need(&p, end, num * sizeof(u32), bad);
 120         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
 132 bad:
 133         return -ERANGE;
 134 }
 135
 136 static int ceph_build_auth_request(struct ceph_auth_client *ac,
 137                                    void *msg_buf, size_t msg_len)
 138 {
 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) {
 152                 pr_err("error %d building auth method %s request\n", ret,
 153                        ac->ops->name);
 154                 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
 161 /*
 162  * Handle auth message from monitor.
 163  */
 164 int 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) {
 205                 /* server does not support our protocols? */
 206                 if (!protocol && result < 0) {
 207                         ret = result;
 208                         goto out;
 209                 }
 210                 /* 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) {
 219                                 pr_err("error %d on auth protocol %d init\n",
 220                                        ret, protocol);
 221                                 goto out;
 222                         }
 223                 }
 224
 225                 ac->negotiating = false;
 226         }
 227
 228         ret = ac->ops->handle_reply(ac, result, payload, payload_end);
 229         if (ret == -EAGAIN) {
 230                 return ceph_build_auth_request(ac, reply_buf, reply_len);
 231         } else if (ret) {
 232                 pr_err("auth method '%s' error %d\n", ac->ops->name, ret);
 233                 return ret;
 234         }
 235         return 0;
 236
 237 bad:
 238         pr_err("failed to decode auth msg\n");
 239 out:
 240         return ret;
 241 }
 242
 243 int 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);
 249         if (ac->ops->should_authenticate(ac))
 250                 return ceph_build_auth_request(ac, msg_buf, msg_len);
 251         return 0;
 252 }
 253
 254 int 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 }