Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Uwe Zeisberger | f30c226 | 2006-10-03 23:01:26 +0200 | [diff] [blame] | 2 | * linux/net/sunrpc/auth_gss/auth_gss.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * RPCSEC_GSS client authentication. |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 5 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * Copyright (c) 2000 The Regents of the University of Michigan. |
| 7 | * All rights reserved. |
| 8 | * |
| 9 | * Dug Song <dugsong@monkey.org> |
| 10 | * Andy Adamson <andros@umich.edu> |
| 11 | * |
| 12 | * Redistribution and use in source and binary forms, with or without |
| 13 | * modification, are permitted provided that the following conditions |
| 14 | * are met: |
| 15 | * |
| 16 | * 1. Redistributions of source code must retain the above copyright |
| 17 | * notice, this list of conditions and the following disclaimer. |
| 18 | * 2. Redistributions in binary form must reproduce the above copyright |
| 19 | * notice, this list of conditions and the following disclaimer in the |
| 20 | * documentation and/or other materials provided with the distribution. |
| 21 | * 3. Neither the name of the University nor the names of its |
| 22 | * contributors may be used to endorse or promote products derived |
| 23 | * from this software without specific prior written permission. |
| 24 | * |
| 25 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| 26 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| 27 | * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
| 28 | * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| 29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| 30 | * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| 31 | * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR |
| 32 | * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| 33 | * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| 34 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| 35 | * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | */ |
| 37 | |
| 38 | |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/types.h> |
| 42 | #include <linux/slab.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <linux/sched.h> |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 44 | #include <linux/pagemap.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <linux/sunrpc/clnt.h> |
| 46 | #include <linux/sunrpc/auth.h> |
| 47 | #include <linux/sunrpc/auth_gss.h> |
| 48 | #include <linux/sunrpc/svcauth_gss.h> |
| 49 | #include <linux/sunrpc/gss_err.h> |
| 50 | #include <linux/workqueue.h> |
| 51 | #include <linux/sunrpc/rpc_pipe_fs.h> |
| 52 | #include <linux/sunrpc/gss_api.h> |
| 53 | #include <asm/uaccess.h> |
| 54 | |
Trond Myklebust | f1c0a86 | 2007-06-23 20:17:58 -0400 | [diff] [blame] | 55 | static const struct rpc_authops authgss_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Trond Myklebust | f1c0a86 | 2007-06-23 20:17:58 -0400 | [diff] [blame] | 57 | static const struct rpc_credops gss_credops; |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 58 | static const struct rpc_credops gss_nullops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | #ifdef RPC_DEBUG |
| 61 | # define RPCDBG_FACILITY RPCDBG_AUTH |
| 62 | #endif |
| 63 | |
\\\"J. Bruce Fields\\\ | d25a03c | 2008-06-09 16:51:34 -0400 | [diff] [blame] | 64 | #define GSS_CRED_SLACK 1024 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 65 | /* length of a krb5 verifier (48), plus data added before arguments when |
| 66 | * using integrity (two 4-byte integers): */ |
Olga Kornievskaia | adeb813 | 2006-12-04 20:22:34 -0500 | [diff] [blame] | 67 | #define GSS_VERF_SLACK 100 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | struct gss_auth { |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 70 | struct kref kref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | struct rpc_auth rpc_auth; |
| 72 | struct gss_api_mech *mech; |
| 73 | enum rpc_gss_svc service; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | struct rpc_clnt *client; |
| 75 | struct dentry *dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | }; |
| 77 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 78 | static void gss_free_ctx(struct gss_cl_ctx *); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | static struct rpc_pipe_ops gss_upcall_ops; |
| 80 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 81 | static inline struct gss_cl_ctx * |
| 82 | gss_get_ctx(struct gss_cl_ctx *ctx) |
| 83 | { |
| 84 | atomic_inc(&ctx->count); |
| 85 | return ctx; |
| 86 | } |
| 87 | |
| 88 | static inline void |
| 89 | gss_put_ctx(struct gss_cl_ctx *ctx) |
| 90 | { |
| 91 | if (atomic_dec_and_test(&ctx->count)) |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 92 | gss_free_ctx(ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | } |
| 94 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 95 | /* gss_cred_set_ctx: |
| 96 | * called by gss_upcall_callback and gss_create_upcall in order |
| 97 | * to set the gss context. The actual exchange of an old context |
| 98 | * and a new one is protected by the inode->i_lock. |
| 99 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | static void |
| 101 | gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) |
| 102 | { |
| 103 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 104 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 105 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
| 106 | return; |
Trond Myklebust | 7b6962b | 2008-04-17 16:53:01 -0400 | [diff] [blame] | 107 | gss_get_ctx(ctx); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 108 | rcu_assign_pointer(gss_cred->gc_ctx, ctx); |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 109 | set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 110 | smp_mb__before_clear_bit(); |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 111 | clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | } |
| 113 | |
| 114 | static const void * |
| 115 | simple_get_bytes(const void *p, const void *end, void *res, size_t len) |
| 116 | { |
| 117 | const void *q = (const void *)((const char *)p + len); |
| 118 | if (unlikely(q > end || q < p)) |
| 119 | return ERR_PTR(-EFAULT); |
| 120 | memcpy(res, p, len); |
| 121 | return q; |
| 122 | } |
| 123 | |
| 124 | static inline const void * |
| 125 | simple_get_netobj(const void *p, const void *end, struct xdr_netobj *dest) |
| 126 | { |
| 127 | const void *q; |
| 128 | unsigned int len; |
| 129 | |
| 130 | p = simple_get_bytes(p, end, &len, sizeof(len)); |
| 131 | if (IS_ERR(p)) |
| 132 | return p; |
| 133 | q = (const void *)((const char *)p + len); |
| 134 | if (unlikely(q > end || q < p)) |
| 135 | return ERR_PTR(-EFAULT); |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 136 | dest->data = kmemdup(p, len, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | if (unlikely(dest->data == NULL)) |
| 138 | return ERR_PTR(-ENOMEM); |
| 139 | dest->len = len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | return q; |
| 141 | } |
| 142 | |
| 143 | static struct gss_cl_ctx * |
| 144 | gss_cred_get_ctx(struct rpc_cred *cred) |
| 145 | { |
| 146 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 147 | struct gss_cl_ctx *ctx = NULL; |
| 148 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 149 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | if (gss_cred->gc_ctx) |
| 151 | ctx = gss_get_ctx(gss_cred->gc_ctx); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 152 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | return ctx; |
| 154 | } |
| 155 | |
| 156 | static struct gss_cl_ctx * |
| 157 | gss_alloc_context(void) |
| 158 | { |
| 159 | struct gss_cl_ctx *ctx; |
| 160 | |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 161 | ctx = kzalloc(sizeof(*ctx), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | if (ctx != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | ctx->gc_proc = RPC_GSS_PROC_DATA; |
| 164 | ctx->gc_seq = 1; /* NetApp 6.4R1 doesn't accept seq. no. 0 */ |
| 165 | spin_lock_init(&ctx->gc_seq_lock); |
| 166 | atomic_set(&ctx->count,1); |
| 167 | } |
| 168 | return ctx; |
| 169 | } |
| 170 | |
| 171 | #define GSSD_MIN_TIMEOUT (60 * 60) |
| 172 | static const void * |
| 173 | gss_fill_context(const void *p, const void *end, struct gss_cl_ctx *ctx, struct gss_api_mech *gm) |
| 174 | { |
| 175 | const void *q; |
| 176 | unsigned int seclen; |
| 177 | unsigned int timeout; |
| 178 | u32 window_size; |
| 179 | int ret; |
| 180 | |
| 181 | /* First unsigned int gives the lifetime (in seconds) of the cred */ |
| 182 | p = simple_get_bytes(p, end, &timeout, sizeof(timeout)); |
| 183 | if (IS_ERR(p)) |
| 184 | goto err; |
| 185 | if (timeout == 0) |
| 186 | timeout = GSSD_MIN_TIMEOUT; |
| 187 | ctx->gc_expiry = jiffies + (unsigned long)timeout * HZ * 3 / 4; |
| 188 | /* Sequence number window. Determines the maximum number of simultaneous requests */ |
| 189 | p = simple_get_bytes(p, end, &window_size, sizeof(window_size)); |
| 190 | if (IS_ERR(p)) |
| 191 | goto err; |
| 192 | ctx->gc_win = window_size; |
| 193 | /* gssd signals an error by passing ctx->gc_win = 0: */ |
| 194 | if (ctx->gc_win == 0) { |
| 195 | /* in which case, p points to an error code which we ignore */ |
| 196 | p = ERR_PTR(-EACCES); |
| 197 | goto err; |
| 198 | } |
| 199 | /* copy the opaque wire context */ |
| 200 | p = simple_get_netobj(p, end, &ctx->gc_wire_ctx); |
| 201 | if (IS_ERR(p)) |
| 202 | goto err; |
| 203 | /* import the opaque security context */ |
| 204 | p = simple_get_bytes(p, end, &seclen, sizeof(seclen)); |
| 205 | if (IS_ERR(p)) |
| 206 | goto err; |
| 207 | q = (const void *)((const char *)p + seclen); |
| 208 | if (unlikely(q > end || q < p)) { |
| 209 | p = ERR_PTR(-EFAULT); |
| 210 | goto err; |
| 211 | } |
| 212 | ret = gss_import_sec_context(p, seclen, gm, &ctx->gc_gss_ctx); |
| 213 | if (ret < 0) { |
| 214 | p = ERR_PTR(ret); |
| 215 | goto err; |
| 216 | } |
| 217 | return q; |
| 218 | err: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 219 | dprintk("RPC: gss_fill_context returning %ld\n", -PTR_ERR(p)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | return p; |
| 221 | } |
| 222 | |
| 223 | |
| 224 | struct gss_upcall_msg { |
| 225 | atomic_t count; |
| 226 | uid_t uid; |
| 227 | struct rpc_pipe_msg msg; |
| 228 | struct list_head list; |
| 229 | struct gss_auth *auth; |
| 230 | struct rpc_wait_queue rpc_waitqueue; |
| 231 | wait_queue_head_t waitqueue; |
| 232 | struct gss_cl_ctx *ctx; |
| 233 | }; |
| 234 | |
| 235 | static void |
| 236 | gss_release_msg(struct gss_upcall_msg *gss_msg) |
| 237 | { |
| 238 | if (!atomic_dec_and_test(&gss_msg->count)) |
| 239 | return; |
| 240 | BUG_ON(!list_empty(&gss_msg->list)); |
| 241 | if (gss_msg->ctx != NULL) |
| 242 | gss_put_ctx(gss_msg->ctx); |
Trond Myklebust | f6a1cc8 | 2008-02-22 17:06:55 -0500 | [diff] [blame] | 243 | rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | kfree(gss_msg); |
| 245 | } |
| 246 | |
| 247 | static struct gss_upcall_msg * |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 248 | __gss_find_upcall(struct rpc_inode *rpci, uid_t uid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 249 | { |
| 250 | struct gss_upcall_msg *pos; |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 251 | list_for_each_entry(pos, &rpci->in_downcall, list) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | if (pos->uid != uid) |
| 253 | continue; |
| 254 | atomic_inc(&pos->count); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 255 | dprintk("RPC: gss_find_upcall found msg %p\n", pos); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | return pos; |
| 257 | } |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 258 | dprintk("RPC: gss_find_upcall found nothing\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | return NULL; |
| 260 | } |
| 261 | |
\\\"J. Bruce Fields\\\ | 720b8f2 | 2008-06-09 16:51:33 -0400 | [diff] [blame] | 262 | /* Try to add an upcall to the pipefs queue. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | * If an upcall owned by our uid already exists, then we return a reference |
| 264 | * to that upcall instead of adding the new upcall. |
| 265 | */ |
| 266 | static inline struct gss_upcall_msg * |
| 267 | gss_add_msg(struct gss_auth *gss_auth, struct gss_upcall_msg *gss_msg) |
| 268 | { |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 269 | struct inode *inode = gss_auth->dentry->d_inode; |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 270 | struct rpc_inode *rpci = RPC_I(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 271 | struct gss_upcall_msg *old; |
| 272 | |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 273 | spin_lock(&inode->i_lock); |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 274 | old = __gss_find_upcall(rpci, gss_msg->uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | if (old == NULL) { |
| 276 | atomic_inc(&gss_msg->count); |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 277 | list_add(&gss_msg->list, &rpci->in_downcall); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | } else |
| 279 | gss_msg = old; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 280 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | return gss_msg; |
| 282 | } |
| 283 | |
| 284 | static void |
| 285 | __gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| 286 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | list_del_init(&gss_msg->list); |
| 288 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| 289 | wake_up_all(&gss_msg->waitqueue); |
| 290 | atomic_dec(&gss_msg->count); |
| 291 | } |
| 292 | |
| 293 | static void |
| 294 | gss_unhash_msg(struct gss_upcall_msg *gss_msg) |
| 295 | { |
| 296 | struct gss_auth *gss_auth = gss_msg->auth; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 297 | struct inode *inode = gss_auth->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 299 | if (list_empty(&gss_msg->list)) |
| 300 | return; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 301 | spin_lock(&inode->i_lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 302 | if (!list_empty(&gss_msg->list)) |
| 303 | __gss_unhash_msg(gss_msg); |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 304 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | static void |
| 308 | gss_upcall_callback(struct rpc_task *task) |
| 309 | { |
| 310 | struct gss_cred *gss_cred = container_of(task->tk_msg.rpc_cred, |
| 311 | struct gss_cred, gc_base); |
| 312 | struct gss_upcall_msg *gss_msg = gss_cred->gc_upcall; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 313 | struct inode *inode = gss_msg->auth->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 315 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | if (gss_msg->ctx) |
Trond Myklebust | 7b6962b | 2008-04-17 16:53:01 -0400 | [diff] [blame] | 317 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | else |
| 319 | task->tk_status = gss_msg->msg.errno; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | gss_cred->gc_upcall = NULL; |
| 321 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 322 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | gss_release_msg(gss_msg); |
| 324 | } |
| 325 | |
| 326 | static inline struct gss_upcall_msg * |
| 327 | gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) |
| 328 | { |
| 329 | struct gss_upcall_msg *gss_msg; |
| 330 | |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 331 | gss_msg = kzalloc(sizeof(*gss_msg), GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | if (gss_msg != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | INIT_LIST_HEAD(&gss_msg->list); |
| 334 | rpc_init_wait_queue(&gss_msg->rpc_waitqueue, "RPCSEC_GSS upcall waitq"); |
| 335 | init_waitqueue_head(&gss_msg->waitqueue); |
| 336 | atomic_set(&gss_msg->count, 1); |
| 337 | gss_msg->msg.data = &gss_msg->uid; |
| 338 | gss_msg->msg.len = sizeof(gss_msg->uid); |
| 339 | gss_msg->uid = uid; |
| 340 | gss_msg->auth = gss_auth; |
| 341 | } |
| 342 | return gss_msg; |
| 343 | } |
| 344 | |
| 345 | static struct gss_upcall_msg * |
| 346 | gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) |
| 347 | { |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 348 | struct gss_cred *gss_cred = container_of(cred, |
| 349 | struct gss_cred, gc_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | struct gss_upcall_msg *gss_new, *gss_msg; |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 351 | uid_t uid = cred->cr_uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 353 | /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ |
| 354 | if (gss_cred->gc_machine_cred != 0) |
| 355 | uid = 0; |
| 356 | |
| 357 | gss_new = gss_alloc_msg(gss_auth, uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | if (gss_new == NULL) |
| 359 | return ERR_PTR(-ENOMEM); |
| 360 | gss_msg = gss_add_msg(gss_auth, gss_new); |
| 361 | if (gss_msg == gss_new) { |
| 362 | int res = rpc_queue_upcall(gss_auth->dentry->d_inode, &gss_new->msg); |
| 363 | if (res) { |
| 364 | gss_unhash_msg(gss_new); |
| 365 | gss_msg = ERR_PTR(res); |
| 366 | } |
| 367 | } else |
| 368 | gss_release_msg(gss_new); |
| 369 | return gss_msg; |
| 370 | } |
| 371 | |
| 372 | static inline int |
| 373 | gss_refresh_upcall(struct rpc_task *task) |
| 374 | { |
| 375 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
Trond Myklebust | 4a8c134 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 376 | struct gss_auth *gss_auth = container_of(cred->cr_auth, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | struct gss_auth, rpc_auth); |
| 378 | struct gss_cred *gss_cred = container_of(cred, |
| 379 | struct gss_cred, gc_base); |
| 380 | struct gss_upcall_msg *gss_msg; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 381 | struct inode *inode = gss_auth->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | int err = 0; |
| 383 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 384 | dprintk("RPC: %5u gss_refresh_upcall for uid %u\n", task->tk_pid, |
| 385 | cred->cr_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | gss_msg = gss_setup_upcall(task->tk_client, gss_auth, cred); |
| 387 | if (IS_ERR(gss_msg)) { |
| 388 | err = PTR_ERR(gss_msg); |
| 389 | goto out; |
| 390 | } |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 391 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | if (gss_cred->gc_upcall != NULL) |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 393 | rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); |
Trond Myklebust | 7b6962b | 2008-04-17 16:53:01 -0400 | [diff] [blame] | 394 | else if (gss_msg->ctx != NULL) { |
| 395 | gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); |
| 396 | gss_cred->gc_upcall = NULL; |
| 397 | rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); |
| 398 | } else if (gss_msg->msg.errno >= 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | task->tk_timeout = 0; |
| 400 | gss_cred->gc_upcall = gss_msg; |
| 401 | /* gss_upcall_callback will release the reference to gss_upcall_msg */ |
| 402 | atomic_inc(&gss_msg->count); |
Trond Myklebust | 5d00837 | 2008-02-22 16:34:17 -0500 | [diff] [blame] | 403 | rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | } else |
| 405 | err = gss_msg->msg.errno; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 406 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | gss_release_msg(gss_msg); |
| 408 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 409 | dprintk("RPC: %5u gss_refresh_upcall for uid %u result %d\n", |
| 410 | task->tk_pid, cred->cr_uid, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | return err; |
| 412 | } |
| 413 | |
| 414 | static inline int |
| 415 | gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) |
| 416 | { |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 417 | struct inode *inode = gss_auth->dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | struct rpc_cred *cred = &gss_cred->gc_base; |
| 419 | struct gss_upcall_msg *gss_msg; |
| 420 | DEFINE_WAIT(wait); |
| 421 | int err = 0; |
| 422 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 423 | dprintk("RPC: gss_upcall for uid %u\n", cred->cr_uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | gss_msg = gss_setup_upcall(gss_auth->client, gss_auth, cred); |
| 425 | if (IS_ERR(gss_msg)) { |
| 426 | err = PTR_ERR(gss_msg); |
| 427 | goto out; |
| 428 | } |
| 429 | for (;;) { |
| 430 | prepare_to_wait(&gss_msg->waitqueue, &wait, TASK_INTERRUPTIBLE); |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 431 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | if (gss_msg->ctx != NULL || gss_msg->msg.errno < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | break; |
| 434 | } |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 435 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (signalled()) { |
| 437 | err = -ERESTARTSYS; |
| 438 | goto out_intr; |
| 439 | } |
| 440 | schedule(); |
| 441 | } |
| 442 | if (gss_msg->ctx) |
Trond Myklebust | 7b6962b | 2008-04-17 16:53:01 -0400 | [diff] [blame] | 443 | gss_cred_set_ctx(cred, gss_msg->ctx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | else |
| 445 | err = gss_msg->msg.errno; |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 446 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | out_intr: |
| 448 | finish_wait(&gss_msg->waitqueue, &wait); |
| 449 | gss_release_msg(gss_msg); |
| 450 | out: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 451 | dprintk("RPC: gss_create_upcall for uid %u result %d\n", |
| 452 | cred->cr_uid, err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | return err; |
| 454 | } |
| 455 | |
| 456 | static ssize_t |
| 457 | gss_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, |
| 458 | char __user *dst, size_t buflen) |
| 459 | { |
| 460 | char *data = (char *)msg->data + msg->copied; |
Chuck Lever | 7df0899 | 2007-12-20 14:54:27 -0500 | [diff] [blame] | 461 | size_t mlen = min(msg->len, buflen); |
| 462 | unsigned long left; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | left = copy_to_user(dst, data, mlen); |
Chuck Lever | 7df0899 | 2007-12-20 14:54:27 -0500 | [diff] [blame] | 465 | if (left == mlen) { |
| 466 | msg->errno = -EFAULT; |
| 467 | return -EFAULT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | } |
Chuck Lever | 7df0899 | 2007-12-20 14:54:27 -0500 | [diff] [blame] | 469 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | mlen -= left; |
| 471 | msg->copied += mlen; |
| 472 | msg->errno = 0; |
| 473 | return mlen; |
| 474 | } |
| 475 | |
| 476 | #define MSG_BUF_MAXSIZE 1024 |
| 477 | |
| 478 | static ssize_t |
| 479 | gss_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) |
| 480 | { |
| 481 | const void *p, *end; |
| 482 | void *buf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | struct gss_upcall_msg *gss_msg; |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 484 | struct inode *inode = filp->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | struct gss_cl_ctx *ctx; |
| 486 | uid_t uid; |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 487 | ssize_t err = -EFBIG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
| 489 | if (mlen > MSG_BUF_MAXSIZE) |
| 490 | goto out; |
| 491 | err = -ENOMEM; |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 492 | buf = kmalloc(mlen, GFP_NOFS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | if (!buf) |
| 494 | goto out; |
| 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | err = -EFAULT; |
| 497 | if (copy_from_user(buf, src, mlen)) |
| 498 | goto err; |
| 499 | |
| 500 | end = (const void *)((char *)buf + mlen); |
| 501 | p = simple_get_bytes(buf, end, &uid, sizeof(uid)); |
| 502 | if (IS_ERR(p)) { |
| 503 | err = PTR_ERR(p); |
| 504 | goto err; |
| 505 | } |
| 506 | |
| 507 | err = -ENOMEM; |
| 508 | ctx = gss_alloc_context(); |
| 509 | if (ctx == NULL) |
| 510 | goto err; |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 511 | |
| 512 | err = -ENOENT; |
| 513 | /* Find a matching upcall */ |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 514 | spin_lock(&inode->i_lock); |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 515 | gss_msg = __gss_find_upcall(RPC_I(inode), uid); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 516 | if (gss_msg == NULL) { |
| 517 | spin_unlock(&inode->i_lock); |
| 518 | goto err_put_ctx; |
| 519 | } |
| 520 | list_del_init(&gss_msg->list); |
| 521 | spin_unlock(&inode->i_lock); |
| 522 | |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 523 | p = gss_fill_context(p, end, ctx, gss_msg->auth->mech); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 524 | if (IS_ERR(p)) { |
| 525 | err = PTR_ERR(p); |
Kevin Coffman | ffc40f5 | 2007-11-09 18:42:04 -0500 | [diff] [blame] | 526 | gss_msg->msg.errno = (err == -EAGAIN) ? -EAGAIN : -EACCES; |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 527 | goto err_release_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | } |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 529 | gss_msg->ctx = gss_get_ctx(ctx); |
| 530 | err = mlen; |
| 531 | |
| 532 | err_release_msg: |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 533 | spin_lock(&inode->i_lock); |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 534 | __gss_unhash_msg(gss_msg); |
| 535 | spin_unlock(&inode->i_lock); |
| 536 | gss_release_msg(gss_msg); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | err_put_ctx: |
| 538 | gss_put_ctx(ctx); |
| 539 | err: |
| 540 | kfree(buf); |
| 541 | out: |
Trond Myklebust | 3b68aae | 2007-06-07 10:14:15 -0400 | [diff] [blame] | 542 | dprintk("RPC: gss_pipe_downcall returning %Zd\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | return err; |
| 544 | } |
| 545 | |
| 546 | static void |
| 547 | gss_pipe_release(struct inode *inode) |
| 548 | { |
| 549 | struct rpc_inode *rpci = RPC_I(inode); |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 550 | struct gss_upcall_msg *gss_msg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 552 | spin_lock(&inode->i_lock); |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 553 | while (!list_empty(&rpci->in_downcall)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | |
Trond Myklebust | 6e84c7b | 2007-06-07 15:31:36 -0400 | [diff] [blame] | 555 | gss_msg = list_entry(rpci->in_downcall.next, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | struct gss_upcall_msg, list); |
| 557 | gss_msg->msg.errno = -EPIPE; |
| 558 | atomic_inc(&gss_msg->count); |
| 559 | __gss_unhash_msg(gss_msg); |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 560 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | gss_release_msg(gss_msg); |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 562 | spin_lock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
Trond Myklebust | b185f83 | 2007-06-07 10:14:14 -0400 | [diff] [blame] | 564 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | } |
| 566 | |
| 567 | static void |
| 568 | gss_pipe_destroy_msg(struct rpc_pipe_msg *msg) |
| 569 | { |
| 570 | struct gss_upcall_msg *gss_msg = container_of(msg, struct gss_upcall_msg, msg); |
| 571 | static unsigned long ratelimit; |
| 572 | |
| 573 | if (msg->errno < 0) { |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 574 | dprintk("RPC: gss_pipe_destroy_msg releasing msg %p\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | gss_msg); |
| 576 | atomic_inc(&gss_msg->count); |
| 577 | gss_unhash_msg(gss_msg); |
Trond Myklebust | 48e4918 | 2005-12-19 17:11:22 -0500 | [diff] [blame] | 578 | if (msg->errno == -ETIMEDOUT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | unsigned long now = jiffies; |
| 580 | if (time_after(now, ratelimit)) { |
| 581 | printk(KERN_WARNING "RPC: AUTH_GSS upcall timed out.\n" |
| 582 | "Please check user daemon is running!\n"); |
| 583 | ratelimit = now + 15*HZ; |
| 584 | } |
| 585 | } |
| 586 | gss_release_msg(gss_msg); |
| 587 | } |
| 588 | } |
| 589 | |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 590 | /* |
| 591 | * NOTE: we have the opportunity to use different |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | * parameters based on the input flavor (which must be a pseudoflavor) |
| 593 | */ |
| 594 | static struct rpc_auth * |
| 595 | gss_create(struct rpc_clnt *clnt, rpc_authflavor_t flavor) |
| 596 | { |
| 597 | struct gss_auth *gss_auth; |
| 598 | struct rpc_auth * auth; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 599 | int err = -ENOMEM; /* XXX? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 601 | dprintk("RPC: creating GSS authenticator for client %p\n", clnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
| 603 | if (!try_module_get(THIS_MODULE)) |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 604 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | if (!(gss_auth = kmalloc(sizeof(*gss_auth), GFP_KERNEL))) |
| 606 | goto out_dec; |
| 607 | gss_auth->client = clnt; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 608 | err = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | gss_auth->mech = gss_mech_get_by_pseudoflavor(flavor); |
| 610 | if (!gss_auth->mech) { |
James Morris | 3392c34 | 2007-12-26 11:20:43 +1100 | [diff] [blame] | 611 | printk(KERN_WARNING "%s: Pseudoflavor %d not found!\n", |
Harvey Harrison | 0dc4787 | 2008-03-05 20:47:47 -0800 | [diff] [blame] | 612 | __func__, flavor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | goto err_free; |
| 614 | } |
| 615 | gss_auth->service = gss_pseudoflavor_to_service(gss_auth->mech, flavor); |
J. Bruce Fields | 438b6fd | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 616 | if (gss_auth->service == 0) |
| 617 | goto err_put_mech; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | auth = &gss_auth->rpc_auth; |
| 619 | auth->au_cslack = GSS_CRED_SLACK >> 2; |
| 620 | auth->au_rslack = GSS_VERF_SLACK >> 2; |
| 621 | auth->au_ops = &authgss_ops; |
| 622 | auth->au_flavor = flavor; |
| 623 | atomic_set(&auth->au_count, 1); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 624 | kref_init(&gss_auth->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | |
Trond Myklebust | 158998b | 2006-08-24 01:03:17 -0400 | [diff] [blame] | 626 | gss_auth->dentry = rpc_mkpipe(clnt->cl_dentry, gss_auth->mech->gm_name, |
| 627 | clnt, &gss_upcall_ops, RPC_PIPE_WAIT_FOR_OPEN); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 628 | if (IS_ERR(gss_auth->dentry)) { |
| 629 | err = PTR_ERR(gss_auth->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | goto err_put_mech; |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 631 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
Trond Myklebust | f5c2187 | 2007-06-25 17:11:20 -0400 | [diff] [blame] | 633 | err = rpcauth_init_credcache(auth); |
Trond Myklebust | 07a2bf1 | 2007-06-09 15:42:01 -0400 | [diff] [blame] | 634 | if (err) |
| 635 | goto err_unlink_pipe; |
| 636 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | return auth; |
Trond Myklebust | 07a2bf1 | 2007-06-09 15:42:01 -0400 | [diff] [blame] | 638 | err_unlink_pipe: |
| 639 | rpc_unlink(gss_auth->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | err_put_mech: |
| 641 | gss_mech_put(gss_auth->mech); |
| 642 | err_free: |
| 643 | kfree(gss_auth); |
| 644 | out_dec: |
| 645 | module_put(THIS_MODULE); |
J. Bruce Fields | 6a19275 | 2005-06-22 17:16:23 +0000 | [diff] [blame] | 646 | return ERR_PTR(err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | static void |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 650 | gss_free(struct gss_auth *gss_auth) |
| 651 | { |
| 652 | rpc_unlink(gss_auth->dentry); |
| 653 | gss_auth->dentry = NULL; |
| 654 | gss_mech_put(gss_auth->mech); |
| 655 | |
| 656 | kfree(gss_auth); |
| 657 | module_put(THIS_MODULE); |
| 658 | } |
| 659 | |
| 660 | static void |
| 661 | gss_free_callback(struct kref *kref) |
| 662 | { |
| 663 | struct gss_auth *gss_auth = container_of(kref, struct gss_auth, kref); |
| 664 | |
| 665 | gss_free(gss_auth); |
| 666 | } |
| 667 | |
| 668 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | gss_destroy(struct rpc_auth *auth) |
| 670 | { |
| 671 | struct gss_auth *gss_auth; |
| 672 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 673 | dprintk("RPC: destroying GSS authenticator %p flavor %d\n", |
| 674 | auth, auth->au_flavor); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
Trond Myklebust | 3ab9bb7 | 2007-06-09 15:41:42 -0400 | [diff] [blame] | 676 | rpcauth_destroy_credcache(auth); |
| 677 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 678 | gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 679 | kref_put(&gss_auth->kref, gss_free_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | } |
| 681 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 682 | /* |
| 683 | * gss_destroying_context will cause the RPCSEC_GSS to send a NULL RPC call |
| 684 | * to the server with the GSS control procedure field set to |
| 685 | * RPC_GSS_PROC_DESTROY. This should normally cause the server to release |
| 686 | * all RPCSEC_GSS state associated with that context. |
| 687 | */ |
| 688 | static int |
| 689 | gss_destroying_context(struct rpc_cred *cred) |
| 690 | { |
| 691 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
| 692 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
| 693 | struct rpc_task *task; |
| 694 | |
| 695 | if (gss_cred->gc_ctx == NULL || |
Trond Myklebust | 080a1f1 | 2008-04-19 14:22:31 -0400 | [diff] [blame] | 696 | test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 697 | return 0; |
| 698 | |
| 699 | gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; |
| 700 | cred->cr_ops = &gss_nullops; |
| 701 | |
| 702 | /* Take a reference to ensure the cred will be destroyed either |
| 703 | * by the RPC call or by the put_rpccred() below */ |
| 704 | get_rpccred(cred); |
| 705 | |
Trond Myklebust | 080a1f1 | 2008-04-19 14:22:31 -0400 | [diff] [blame] | 706 | task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 707 | if (!IS_ERR(task)) |
| 708 | rpc_put_task(task); |
| 709 | |
| 710 | put_rpccred(cred); |
| 711 | return 1; |
| 712 | } |
| 713 | |
| 714 | /* gss_destroy_cred (and gss_free_ctx) are used to clean up after failure |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | * to create a new cred or context, so they check that things have been |
| 716 | * allocated before freeing them. */ |
| 717 | static void |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 718 | gss_do_free_ctx(struct gss_cl_ctx *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | { |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 720 | dprintk("RPC: gss_free_ctx\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | kfree(ctx->gc_wire_ctx.data); |
| 723 | kfree(ctx); |
| 724 | } |
| 725 | |
| 726 | static void |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 727 | gss_free_ctx_callback(struct rcu_head *head) |
| 728 | { |
| 729 | struct gss_cl_ctx *ctx = container_of(head, struct gss_cl_ctx, gc_rcu); |
| 730 | gss_do_free_ctx(ctx); |
| 731 | } |
| 732 | |
| 733 | static void |
| 734 | gss_free_ctx(struct gss_cl_ctx *ctx) |
| 735 | { |
Trond Myklebust | a4deb81 | 2007-08-06 12:21:13 -0400 | [diff] [blame] | 736 | struct gss_ctx *gc_gss_ctx; |
| 737 | |
| 738 | gc_gss_ctx = rcu_dereference(ctx->gc_gss_ctx); |
| 739 | rcu_assign_pointer(ctx->gc_gss_ctx, NULL); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 740 | call_rcu(&ctx->gc_rcu, gss_free_ctx_callback); |
Trond Myklebust | a4deb81 | 2007-08-06 12:21:13 -0400 | [diff] [blame] | 741 | if (gc_gss_ctx) |
| 742 | gss_delete_sec_context(&gc_gss_ctx); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 743 | } |
| 744 | |
| 745 | static void |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 746 | gss_free_cred(struct gss_cred *gss_cred) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | { |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 748 | dprintk("RPC: gss_free_cred %p\n", gss_cred); |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 749 | kfree(gss_cred); |
| 750 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 752 | static void |
| 753 | gss_free_cred_callback(struct rcu_head *head) |
| 754 | { |
| 755 | struct gss_cred *gss_cred = container_of(head, struct gss_cred, gc_base.cr_rcu); |
| 756 | gss_free_cred(gss_cred); |
| 757 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 759 | static void |
| 760 | gss_destroy_cred(struct rpc_cred *cred) |
| 761 | { |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 762 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 763 | struct gss_auth *gss_auth = container_of(cred->cr_auth, struct gss_auth, rpc_auth); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 764 | struct gss_cl_ctx *ctx = gss_cred->gc_ctx; |
| 765 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 766 | if (gss_destroying_context(cred)) |
| 767 | return; |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 768 | rcu_assign_pointer(gss_cred->gc_ctx, NULL); |
Trond Myklebust | 31be5bf | 2007-06-24 15:55:26 -0400 | [diff] [blame] | 769 | call_rcu(&cred->cr_rcu, gss_free_cred_callback); |
Trond Myklebust | 5d28dc8 | 2007-06-26 19:18:38 -0400 | [diff] [blame] | 770 | if (ctx) |
| 771 | gss_put_ctx(ctx); |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 772 | kref_put(&gss_auth->kref, gss_free_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | } |
| 774 | |
| 775 | /* |
| 776 | * Lookup RPCSEC_GSS cred for the current process |
| 777 | */ |
| 778 | static struct rpc_cred * |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 779 | gss_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | { |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 781 | return rpcauth_lookup_credcache(auth, acred, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | } |
| 783 | |
| 784 | static struct rpc_cred * |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 785 | gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 786 | { |
| 787 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 788 | struct gss_cred *cred = NULL; |
| 789 | int err = -ENOMEM; |
| 790 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 791 | dprintk("RPC: gss_create_cred for uid %d, flavor %d\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | acred->uid, auth->au_flavor); |
| 793 | |
Trond Myklebust | 0f38b87 | 2008-06-10 18:31:01 -0400 | [diff] [blame] | 794 | if (!(cred = kzalloc(sizeof(*cred), GFP_NOFS))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | goto out_err; |
| 796 | |
Trond Myklebust | 5fe4755 | 2007-06-23 19:55:31 -0400 | [diff] [blame] | 797 | rpcauth_init_cred(&cred->gc_base, acred, auth, &gss_credops); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | /* |
| 799 | * Note: in order to force a call to call_refresh(), we deliberately |
| 800 | * fail to flag the credential as RPCAUTH_CRED_UPTODATE. |
| 801 | */ |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 802 | cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | cred->gc_service = gss_auth->service; |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 804 | cred->gc_machine_cred = acred->machine_cred; |
Trond Myklebust | 0285ed1 | 2007-06-27 14:29:12 -0400 | [diff] [blame] | 805 | kref_get(&gss_auth->kref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | return &cred->gc_base; |
| 807 | |
| 808 | out_err: |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 809 | dprintk("RPC: gss_create_cred failed with error %d\n", err); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | return ERR_PTR(err); |
| 811 | } |
| 812 | |
| 813 | static int |
Trond Myklebust | fba3bad | 2006-02-01 12:19:27 -0500 | [diff] [blame] | 814 | gss_cred_init(struct rpc_auth *auth, struct rpc_cred *cred) |
| 815 | { |
| 816 | struct gss_auth *gss_auth = container_of(auth, struct gss_auth, rpc_auth); |
| 817 | struct gss_cred *gss_cred = container_of(cred,struct gss_cred, gc_base); |
| 818 | int err; |
| 819 | |
| 820 | do { |
| 821 | err = gss_create_upcall(gss_auth, gss_cred); |
| 822 | } while (err == -EAGAIN); |
| 823 | return err; |
| 824 | } |
| 825 | |
| 826 | static int |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 827 | gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | { |
| 829 | struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); |
| 830 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 831 | if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 832 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 833 | /* Don't match with creds that have expired. */ |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 834 | if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) |
| 835 | return 0; |
| 836 | if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | return 0; |
Trond Myklebust | 8a31776 | 2006-02-01 12:18:36 -0500 | [diff] [blame] | 838 | out: |
Trond Myklebust | 7c67db3 | 2008-04-07 20:50:11 -0400 | [diff] [blame] | 839 | if (acred->machine_cred != gss_cred->gc_machine_cred) |
| 840 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 841 | return (rc->cr_uid == acred->uid); |
| 842 | } |
| 843 | |
| 844 | /* |
| 845 | * Marshal credentials. |
| 846 | * Maybe we should keep a cached credential for performance reasons. |
| 847 | */ |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 848 | static __be32 * |
| 849 | gss_marshal(struct rpc_task *task, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | { |
| 851 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 852 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 853 | gc_base); |
| 854 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 855 | __be32 *cred_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 856 | struct rpc_rqst *req = task->tk_rqstp; |
| 857 | u32 maj_stat = 0; |
| 858 | struct xdr_netobj mic; |
| 859 | struct kvec iov; |
| 860 | struct xdr_buf verf_buf; |
| 861 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 862 | dprintk("RPC: %5u gss_marshal\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 863 | |
| 864 | *p++ = htonl(RPC_AUTH_GSS); |
| 865 | cred_len = p++; |
| 866 | |
| 867 | spin_lock(&ctx->gc_seq_lock); |
| 868 | req->rq_seqno = ctx->gc_seq++; |
| 869 | spin_unlock(&ctx->gc_seq_lock); |
| 870 | |
| 871 | *p++ = htonl((u32) RPC_GSS_VERSION); |
| 872 | *p++ = htonl((u32) ctx->gc_proc); |
| 873 | *p++ = htonl((u32) req->rq_seqno); |
| 874 | *p++ = htonl((u32) gss_cred->gc_service); |
| 875 | p = xdr_encode_netobj(p, &ctx->gc_wire_ctx); |
| 876 | *cred_len = htonl((p - (cred_len + 1)) << 2); |
| 877 | |
| 878 | /* We compute the checksum for the verifier over the xdr-encoded bytes |
| 879 | * starting with the xid and ending at the end of the credential: */ |
Chuck Lever | 808012f | 2005-08-25 16:25:49 -0700 | [diff] [blame] | 880 | iov.iov_base = xprt_skip_transport_header(task->tk_xprt, |
| 881 | req->rq_snd_buf.head[0].iov_base); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | iov.iov_len = (u8 *)p - (u8 *)iov.iov_base; |
| 883 | xdr_buf_from_iov(&iov, &verf_buf); |
| 884 | |
| 885 | /* set verifier flavor*/ |
| 886 | *p++ = htonl(RPC_AUTH_GSS); |
| 887 | |
| 888 | mic.data = (u8 *)(p + 1); |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 889 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) { |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 891 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | } else if (maj_stat != 0) { |
| 893 | printk("gss_marshal: gss_get_mic FAILED (%d)\n", maj_stat); |
| 894 | goto out_put_ctx; |
| 895 | } |
| 896 | p = xdr_encode_opaque(p, NULL, mic.len); |
| 897 | gss_put_ctx(ctx); |
| 898 | return p; |
| 899 | out_put_ctx: |
| 900 | gss_put_ctx(ctx); |
| 901 | return NULL; |
| 902 | } |
| 903 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 904 | static int gss_renew_cred(struct rpc_task *task) |
| 905 | { |
| 906 | struct rpc_cred *oldcred = task->tk_msg.rpc_cred; |
| 907 | struct gss_cred *gss_cred = container_of(oldcred, |
| 908 | struct gss_cred, |
| 909 | gc_base); |
| 910 | struct rpc_auth *auth = oldcred->cr_auth; |
| 911 | struct auth_cred acred = { |
| 912 | .uid = oldcred->cr_uid, |
| 913 | .machine_cred = gss_cred->gc_machine_cred, |
| 914 | }; |
| 915 | struct rpc_cred *new; |
| 916 | |
| 917 | new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); |
| 918 | if (IS_ERR(new)) |
| 919 | return PTR_ERR(new); |
| 920 | task->tk_msg.rpc_cred = new; |
| 921 | put_rpccred(oldcred); |
| 922 | return 0; |
| 923 | } |
| 924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 925 | /* |
| 926 | * Refresh credentials. XXX - finish |
| 927 | */ |
| 928 | static int |
| 929 | gss_refresh(struct rpc_task *task) |
| 930 | { |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 931 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 932 | int ret = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
Trond Myklebust | cd019f7 | 2008-04-17 17:03:58 -0400 | [diff] [blame] | 934 | if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && |
| 935 | !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { |
| 936 | ret = gss_renew_cred(task); |
| 937 | if (ret < 0) |
| 938 | goto out; |
| 939 | cred = task->tk_msg.rpc_cred; |
| 940 | } |
| 941 | |
| 942 | if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) |
| 943 | ret = gss_refresh_upcall(task); |
| 944 | out: |
| 945 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | } |
| 947 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 948 | /* Dummy refresh routine: used only when destroying the context */ |
| 949 | static int |
| 950 | gss_refresh_null(struct rpc_task *task) |
| 951 | { |
| 952 | return -EACCES; |
| 953 | } |
| 954 | |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 955 | static __be32 * |
| 956 | gss_validate(struct rpc_task *task, __be32 *p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | { |
| 958 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 960 | __be32 seq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | struct kvec iov; |
| 962 | struct xdr_buf verf_buf; |
| 963 | struct xdr_netobj mic; |
| 964 | u32 flav,len; |
| 965 | u32 maj_stat; |
| 966 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 967 | dprintk("RPC: %5u gss_validate\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
| 969 | flav = ntohl(*p++); |
| 970 | if ((len = ntohl(*p++)) > RPC_MAX_AUTH_SIZE) |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 971 | goto out_bad; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 972 | if (flav != RPC_AUTH_GSS) |
| 973 | goto out_bad; |
| 974 | seq = htonl(task->tk_rqstp->rq_seqno); |
| 975 | iov.iov_base = &seq; |
| 976 | iov.iov_len = sizeof(seq); |
| 977 | xdr_buf_from_iov(&iov, &verf_buf); |
| 978 | mic.data = (u8 *)p; |
| 979 | mic.len = len; |
| 980 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 981 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &verf_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 983 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 984 | if (maj_stat) { |
Joe Perches | 014313a | 2007-11-19 17:53:43 -0800 | [diff] [blame] | 985 | dprintk("RPC: %5u gss_validate: gss_verify_mic returned " |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 986 | "error 0x%08x\n", task->tk_pid, maj_stat); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | goto out_bad; |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 988 | } |
J. Bruce Fields | 24b2605 | 2005-10-13 16:54:53 -0400 | [diff] [blame] | 989 | /* We leave it to unwrap to calculate au_rslack. For now we just |
| 990 | * calculate the length of the verifier: */ |
Trond Myklebust | 1be27f3 | 2007-06-27 14:29:04 -0400 | [diff] [blame] | 991 | cred->cr_auth->au_verfsize = XDR_QUADLEN(len) + 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 992 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 993 | dprintk("RPC: %5u gss_validate: gss_verify_mic succeeded.\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 994 | task->tk_pid); |
| 995 | return p + XDR_QUADLEN(len); |
| 996 | out_bad: |
| 997 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 998 | dprintk("RPC: %5u gss_validate failed.\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | return NULL; |
| 1000 | } |
| 1001 | |
| 1002 | static inline int |
| 1003 | gss_wrap_req_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1004 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | { |
| 1006 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1007 | struct xdr_buf integ_buf; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1008 | __be32 *integ_len = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | struct xdr_netobj mic; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1010 | u32 offset; |
| 1011 | __be32 *q; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | struct kvec *iov; |
| 1013 | u32 maj_stat = 0; |
| 1014 | int status = -EIO; |
| 1015 | |
| 1016 | integ_len = p++; |
| 1017 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| 1018 | *p++ = htonl(rqstp->rq_seqno); |
| 1019 | |
J. Bruce Fields | be879c4 | 2007-07-11 18:39:02 -0400 | [diff] [blame] | 1020 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | if (status) |
| 1022 | return status; |
| 1023 | |
| 1024 | if (xdr_buf_subsegment(snd_buf, &integ_buf, |
| 1025 | offset, snd_buf->len - offset)) |
| 1026 | return status; |
| 1027 | *integ_len = htonl(integ_buf.len); |
| 1028 | |
| 1029 | /* guess whether we're in the head or the tail: */ |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1030 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1031 | iov = snd_buf->tail; |
| 1032 | else |
| 1033 | iov = snd_buf->head; |
| 1034 | p = iov->iov_base + iov->iov_len; |
| 1035 | mic.data = (u8 *)(p + 1); |
| 1036 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1037 | maj_stat = gss_get_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | status = -EIO; /* XXX? */ |
| 1039 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1040 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1041 | else if (maj_stat) |
| 1042 | return status; |
| 1043 | q = xdr_encode_opaque(p, NULL, mic.len); |
| 1044 | |
| 1045 | offset = (u8 *)q - (u8 *)p; |
| 1046 | iov->iov_len += offset; |
| 1047 | snd_buf->len += offset; |
| 1048 | return 0; |
| 1049 | } |
| 1050 | |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1051 | static void |
| 1052 | priv_release_snd_buf(struct rpc_rqst *rqstp) |
| 1053 | { |
| 1054 | int i; |
| 1055 | |
| 1056 | for (i=0; i < rqstp->rq_enc_pages_num; i++) |
| 1057 | __free_page(rqstp->rq_enc_pages[i]); |
| 1058 | kfree(rqstp->rq_enc_pages); |
| 1059 | } |
| 1060 | |
| 1061 | static int |
| 1062 | alloc_enc_pages(struct rpc_rqst *rqstp) |
| 1063 | { |
| 1064 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1065 | int first, last, i; |
| 1066 | |
| 1067 | if (snd_buf->page_len == 0) { |
| 1068 | rqstp->rq_enc_pages_num = 0; |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
| 1072 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; |
| 1073 | last = (snd_buf->page_base + snd_buf->page_len - 1) >> PAGE_CACHE_SHIFT; |
| 1074 | rqstp->rq_enc_pages_num = last - first + 1 + 1; |
| 1075 | rqstp->rq_enc_pages |
| 1076 | = kmalloc(rqstp->rq_enc_pages_num * sizeof(struct page *), |
| 1077 | GFP_NOFS); |
| 1078 | if (!rqstp->rq_enc_pages) |
| 1079 | goto out; |
| 1080 | for (i=0; i < rqstp->rq_enc_pages_num; i++) { |
| 1081 | rqstp->rq_enc_pages[i] = alloc_page(GFP_NOFS); |
| 1082 | if (rqstp->rq_enc_pages[i] == NULL) |
| 1083 | goto out_free; |
| 1084 | } |
| 1085 | rqstp->rq_release_snd_buf = priv_release_snd_buf; |
| 1086 | return 0; |
| 1087 | out_free: |
| 1088 | for (i--; i >= 0; i--) { |
| 1089 | __free_page(rqstp->rq_enc_pages[i]); |
| 1090 | } |
| 1091 | out: |
| 1092 | return -EAGAIN; |
| 1093 | } |
| 1094 | |
| 1095 | static inline int |
| 1096 | gss_wrap_req_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1097 | kxdrproc_t encode, struct rpc_rqst *rqstp, __be32 *p, void *obj) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1098 | { |
| 1099 | struct xdr_buf *snd_buf = &rqstp->rq_snd_buf; |
| 1100 | u32 offset; |
| 1101 | u32 maj_stat; |
| 1102 | int status; |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1103 | __be32 *opaque_len; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1104 | struct page **inpages; |
| 1105 | int first; |
| 1106 | int pad; |
| 1107 | struct kvec *iov; |
| 1108 | char *tmp; |
| 1109 | |
| 1110 | opaque_len = p++; |
| 1111 | offset = (u8 *)p - (u8 *)snd_buf->head[0].iov_base; |
| 1112 | *p++ = htonl(rqstp->rq_seqno); |
| 1113 | |
J. Bruce Fields | be879c4 | 2007-07-11 18:39:02 -0400 | [diff] [blame] | 1114 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1115 | if (status) |
| 1116 | return status; |
| 1117 | |
| 1118 | status = alloc_enc_pages(rqstp); |
| 1119 | if (status) |
| 1120 | return status; |
| 1121 | first = snd_buf->page_base >> PAGE_CACHE_SHIFT; |
| 1122 | inpages = snd_buf->pages + first; |
| 1123 | snd_buf->pages = rqstp->rq_enc_pages; |
| 1124 | snd_buf->page_base -= first << PAGE_CACHE_SHIFT; |
| 1125 | /* Give the tail its own page, in case we need extra space in the |
| 1126 | * head when wrapping: */ |
| 1127 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) { |
| 1128 | tmp = page_address(rqstp->rq_enc_pages[rqstp->rq_enc_pages_num - 1]); |
| 1129 | memcpy(tmp, snd_buf->tail[0].iov_base, snd_buf->tail[0].iov_len); |
| 1130 | snd_buf->tail[0].iov_base = tmp; |
| 1131 | } |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1132 | maj_stat = gss_wrap(ctx->gc_gss_ctx, offset, snd_buf, inpages); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1133 | /* RPC_SLACK_SPACE should prevent this ever happening: */ |
| 1134 | BUG_ON(snd_buf->len > snd_buf->buflen); |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1135 | status = -EIO; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1136 | /* We're assuming that when GSS_S_CONTEXT_EXPIRED, the encryption was |
| 1137 | * done anyway, so it's safe to put the request on the wire: */ |
| 1138 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1139 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1140 | else if (maj_stat) |
| 1141 | return status; |
| 1142 | |
| 1143 | *opaque_len = htonl(snd_buf->len - offset); |
| 1144 | /* guess whether we're in the head or the tail: */ |
| 1145 | if (snd_buf->page_len || snd_buf->tail[0].iov_len) |
| 1146 | iov = snd_buf->tail; |
| 1147 | else |
| 1148 | iov = snd_buf->head; |
| 1149 | p = iov->iov_base + iov->iov_len; |
| 1150 | pad = 3 - ((snd_buf->len - offset - 1) & 3); |
| 1151 | memset(p, 0, pad); |
| 1152 | iov->iov_len += pad; |
| 1153 | snd_buf->len += pad; |
| 1154 | |
| 1155 | return 0; |
| 1156 | } |
| 1157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1158 | static int |
| 1159 | gss_wrap_req(struct rpc_task *task, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1160 | kxdrproc_t encode, void *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1161 | { |
| 1162 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 1163 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1164 | gc_base); |
| 1165 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
| 1166 | int status = -EIO; |
| 1167 | |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1168 | dprintk("RPC: %5u gss_wrap_req\n", task->tk_pid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) { |
| 1170 | /* The spec seems a little ambiguous here, but I think that not |
| 1171 | * wrapping context destruction requests makes the most sense. |
| 1172 | */ |
J. Bruce Fields | be879c4 | 2007-07-11 18:39:02 -0400 | [diff] [blame] | 1173 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | goto out; |
| 1175 | } |
| 1176 | switch (gss_cred->gc_service) { |
| 1177 | case RPC_GSS_SVC_NONE: |
J. Bruce Fields | be879c4 | 2007-07-11 18:39:02 -0400 | [diff] [blame] | 1178 | status = rpc_call_xdrproc(encode, rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | break; |
| 1180 | case RPC_GSS_SVC_INTEGRITY: |
| 1181 | status = gss_wrap_req_integ(cred, ctx, encode, |
| 1182 | rqstp, p, obj); |
| 1183 | break; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1184 | case RPC_GSS_SVC_PRIVACY: |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1185 | status = gss_wrap_req_priv(cred, ctx, encode, |
| 1186 | rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | break; |
| 1188 | } |
| 1189 | out: |
| 1190 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1191 | dprintk("RPC: %5u gss_wrap_req returning %d\n", task->tk_pid, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | return status; |
| 1193 | } |
| 1194 | |
| 1195 | static inline int |
| 1196 | gss_unwrap_resp_integ(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1197 | struct rpc_rqst *rqstp, __be32 **p) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | { |
| 1199 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| 1200 | struct xdr_buf integ_buf; |
| 1201 | struct xdr_netobj mic; |
| 1202 | u32 data_offset, mic_offset; |
| 1203 | u32 integ_len; |
| 1204 | u32 maj_stat; |
| 1205 | int status = -EIO; |
| 1206 | |
| 1207 | integ_len = ntohl(*(*p)++); |
| 1208 | if (integ_len & 3) |
| 1209 | return status; |
| 1210 | data_offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| 1211 | mic_offset = integ_len + data_offset; |
| 1212 | if (mic_offset > rcv_buf->len) |
| 1213 | return status; |
| 1214 | if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| 1215 | return status; |
| 1216 | |
| 1217 | if (xdr_buf_subsegment(rcv_buf, &integ_buf, data_offset, |
| 1218 | mic_offset - data_offset)) |
| 1219 | return status; |
| 1220 | |
| 1221 | if (xdr_buf_read_netobj(rcv_buf, &mic, mic_offset)) |
| 1222 | return status; |
| 1223 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1224 | maj_stat = gss_verify_mic(ctx->gc_gss_ctx, &integ_buf, &mic); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1226 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | if (maj_stat != GSS_S_COMPLETE) |
| 1228 | return status; |
| 1229 | return 0; |
| 1230 | } |
| 1231 | |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1232 | static inline int |
| 1233 | gss_unwrap_resp_priv(struct rpc_cred *cred, struct gss_cl_ctx *ctx, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1234 | struct rpc_rqst *rqstp, __be32 **p) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1235 | { |
| 1236 | struct xdr_buf *rcv_buf = &rqstp->rq_rcv_buf; |
| 1237 | u32 offset; |
| 1238 | u32 opaque_len; |
| 1239 | u32 maj_stat; |
| 1240 | int status = -EIO; |
| 1241 | |
| 1242 | opaque_len = ntohl(*(*p)++); |
| 1243 | offset = (u8 *)(*p) - (u8 *)rcv_buf->head[0].iov_base; |
| 1244 | if (offset + opaque_len > rcv_buf->len) |
| 1245 | return status; |
| 1246 | /* remove padding: */ |
| 1247 | rcv_buf->len = offset + opaque_len; |
| 1248 | |
J. Bruce Fields | 00fd6e1 | 2005-10-13 16:55:18 -0400 | [diff] [blame] | 1249 | maj_stat = gss_unwrap(ctx->gc_gss_ctx, offset, rcv_buf); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1250 | if (maj_stat == GSS_S_CONTEXT_EXPIRED) |
Trond Myklebust | fc432dd | 2007-06-25 10:15:15 -0400 | [diff] [blame] | 1251 | clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1252 | if (maj_stat != GSS_S_COMPLETE) |
| 1253 | return status; |
| 1254 | if (ntohl(*(*p)++) != rqstp->rq_seqno) |
| 1255 | return status; |
| 1256 | |
| 1257 | return 0; |
| 1258 | } |
| 1259 | |
| 1260 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1261 | static int |
| 1262 | gss_unwrap_resp(struct rpc_task *task, |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1263 | kxdrproc_t decode, void *rqstp, __be32 *p, void *obj) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1264 | { |
| 1265 | struct rpc_cred *cred = task->tk_msg.rpc_cred; |
| 1266 | struct gss_cred *gss_cred = container_of(cred, struct gss_cred, |
| 1267 | gc_base); |
| 1268 | struct gss_cl_ctx *ctx = gss_cred_get_ctx(cred); |
Alexey Dobriyan | d8ed029 | 2006-09-26 22:29:38 -0700 | [diff] [blame] | 1269 | __be32 *savedp = p; |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1270 | struct kvec *head = ((struct rpc_rqst *)rqstp)->rq_rcv_buf.head; |
| 1271 | int savedlen = head->iov_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1272 | int status = -EIO; |
| 1273 | |
| 1274 | if (ctx->gc_proc != RPC_GSS_PROC_DATA) |
| 1275 | goto out_decode; |
| 1276 | switch (gss_cred->gc_service) { |
| 1277 | case RPC_GSS_SVC_NONE: |
| 1278 | break; |
| 1279 | case RPC_GSS_SVC_INTEGRITY: |
| 1280 | status = gss_unwrap_resp_integ(cred, ctx, rqstp, &p); |
| 1281 | if (status) |
| 1282 | goto out; |
| 1283 | break; |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1284 | case RPC_GSS_SVC_PRIVACY: |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1285 | status = gss_unwrap_resp_priv(cred, ctx, rqstp, &p); |
| 1286 | if (status) |
| 1287 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1288 | break; |
| 1289 | } |
J. Bruce Fields | 24b2605 | 2005-10-13 16:54:53 -0400 | [diff] [blame] | 1290 | /* take into account extra slack for integrity and privacy cases: */ |
Trond Myklebust | 1be27f3 | 2007-06-27 14:29:04 -0400 | [diff] [blame] | 1291 | cred->cr_auth->au_rslack = cred->cr_auth->au_verfsize + (p - savedp) |
J. Bruce Fields | 2d2da60c | 2005-10-13 16:54:58 -0400 | [diff] [blame] | 1292 | + (savedlen - head->iov_len); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1293 | out_decode: |
J. Bruce Fields | be879c4 | 2007-07-11 18:39:02 -0400 | [diff] [blame] | 1294 | status = rpc_call_xdrproc(decode, rqstp, p, obj); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | out: |
| 1296 | gss_put_ctx(ctx); |
Chuck Lever | 8885cb3 | 2007-01-31 12:14:05 -0500 | [diff] [blame] | 1297 | dprintk("RPC: %5u gss_unwrap_resp returning %d\n", task->tk_pid, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | status); |
| 1299 | return status; |
| 1300 | } |
YOSHIFUJI Hideaki | cca5172 | 2007-02-09 15:38:13 -0800 | [diff] [blame] | 1301 | |
Trond Myklebust | f1c0a86 | 2007-06-23 20:17:58 -0400 | [diff] [blame] | 1302 | static const struct rpc_authops authgss_ops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | .owner = THIS_MODULE, |
| 1304 | .au_flavor = RPC_AUTH_GSS, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1305 | .au_name = "RPCSEC_GSS", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | .create = gss_create, |
| 1307 | .destroy = gss_destroy, |
| 1308 | .lookup_cred = gss_lookup_cred, |
| 1309 | .crcreate = gss_create_cred |
| 1310 | }; |
| 1311 | |
Trond Myklebust | f1c0a86 | 2007-06-23 20:17:58 -0400 | [diff] [blame] | 1312 | static const struct rpc_credops gss_credops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1313 | .cr_name = "AUTH_GSS", |
| 1314 | .crdestroy = gss_destroy_cred, |
Trond Myklebust | fba3bad | 2006-02-01 12:19:27 -0500 | [diff] [blame] | 1315 | .cr_init = gss_cred_init, |
Trond Myklebust | 5c69104 | 2008-03-12 16:21:07 -0400 | [diff] [blame] | 1316 | .crbind = rpcauth_generic_bind_cred, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1317 | .crmatch = gss_match, |
| 1318 | .crmarshal = gss_marshal, |
| 1319 | .crrefresh = gss_refresh, |
| 1320 | .crvalidate = gss_validate, |
| 1321 | .crwrap_req = gss_wrap_req, |
| 1322 | .crunwrap_resp = gss_unwrap_resp, |
| 1323 | }; |
| 1324 | |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1325 | static const struct rpc_credops gss_nullops = { |
| 1326 | .cr_name = "AUTH_GSS", |
| 1327 | .crdestroy = gss_destroy_cred, |
Trond Myklebust | 5c69104 | 2008-03-12 16:21:07 -0400 | [diff] [blame] | 1328 | .crbind = rpcauth_generic_bind_cred, |
Trond Myklebust | 0df7fb7 | 2007-06-26 17:04:57 -0400 | [diff] [blame] | 1329 | .crmatch = gss_match, |
| 1330 | .crmarshal = gss_marshal, |
| 1331 | .crrefresh = gss_refresh_null, |
| 1332 | .crvalidate = gss_validate, |
| 1333 | .crwrap_req = gss_wrap_req, |
| 1334 | .crunwrap_resp = gss_unwrap_resp, |
| 1335 | }; |
| 1336 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | static struct rpc_pipe_ops gss_upcall_ops = { |
| 1338 | .upcall = gss_pipe_upcall, |
| 1339 | .downcall = gss_pipe_downcall, |
| 1340 | .destroy_msg = gss_pipe_destroy_msg, |
| 1341 | .release_pipe = gss_pipe_release, |
| 1342 | }; |
| 1343 | |
| 1344 | /* |
| 1345 | * Initialize RPCSEC_GSS module |
| 1346 | */ |
| 1347 | static int __init init_rpcsec_gss(void) |
| 1348 | { |
| 1349 | int err = 0; |
| 1350 | |
| 1351 | err = rpcauth_register(&authgss_ops); |
| 1352 | if (err) |
| 1353 | goto out; |
| 1354 | err = gss_svc_init(); |
| 1355 | if (err) |
| 1356 | goto out_unregister; |
| 1357 | return 0; |
| 1358 | out_unregister: |
| 1359 | rpcauth_unregister(&authgss_ops); |
| 1360 | out: |
| 1361 | return err; |
| 1362 | } |
| 1363 | |
| 1364 | static void __exit exit_rpcsec_gss(void) |
| 1365 | { |
| 1366 | gss_svc_shutdown(); |
| 1367 | rpcauth_unregister(&authgss_ops); |
| 1368 | } |
| 1369 | |
| 1370 | MODULE_LICENSE("GPL"); |
| 1371 | module_init(init_rpcsec_gss) |
| 1372 | module_exit(exit_rpcsec_gss) |